diff options
Diffstat (limited to 'netwerk/sctp/src/netinet/sctp_input.c')
| -rwxr-xr-x | netwerk/sctp/src/netinet/sctp_input.c | 6450 |
1 files changed, 6450 insertions, 0 deletions
diff --git a/netwerk/sctp/src/netinet/sctp_input.c b/netwerk/sctp/src/netinet/sctp_input.c new file mode 100755 index 0000000000..46c196002e --- /dev/null +++ b/netwerk/sctp/src/netinet/sctp_input.c @@ -0,0 +1,6450 @@ +/*- + * SPDX-License-Identifier: BSD-3-Clause + * + * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved. + * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved. + * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * + * a) Redistributions of source code must retain the above copyright notice, + * this list of conditions and the following disclaimer. + * + * b) Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the distribution. + * + * c) Neither the name of Cisco Systems, Inc. nor the names of its + * contributors may be used to endorse or promote products derived + * from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, + * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF + * THE POSSIBILITY OF SUCH DAMAGE. + */ + +#if defined(__FreeBSD__) && !defined(__Userspace__) +#include <sys/cdefs.h> +__FBSDID("$FreeBSD: head/sys/netinet/sctp_input.c 362153 2020-06-13 18:38:59Z tuexen $"); +#endif + +#include <netinet/sctp_os.h> +#include <netinet/sctp_var.h> +#include <netinet/sctp_sysctl.h> +#include <netinet/sctp_pcb.h> +#include <netinet/sctp_header.h> +#include <netinet/sctputil.h> +#include <netinet/sctp_output.h> +#include <netinet/sctp_input.h> +#include <netinet/sctp_auth.h> +#include <netinet/sctp_indata.h> +#include <netinet/sctp_asconf.h> +#include <netinet/sctp_bsd_addr.h> +#include <netinet/sctp_timer.h> +#include <netinet/sctp_crc32.h> +#if defined(__FreeBSD__) && !defined(__Userspace__) +#include <netinet/sctp_kdtrace.h> +#endif +#if defined(INET) || defined(INET6) +#if !defined(_WIN32) +#include <netinet/udp.h> +#endif +#endif +#if defined(__FreeBSD__) && !defined(__Userspace__) +#include <sys/smp.h> +#endif + +static void +sctp_stop_all_cookie_timers(struct sctp_tcb *stcb) +{ + struct sctp_nets *net; + + /* This now not only stops all cookie timers + * it also stops any INIT timers as well. This + * will make sure that the timers are stopped in + * all collision cases. + */ + SCTP_TCB_LOCK_ASSERT(stcb); + TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { + if (net->rxt_timer.type == SCTP_TIMER_TYPE_COOKIE) { + sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE, + stcb->sctp_ep, + stcb, + net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_1); + } else if (net->rxt_timer.type == SCTP_TIMER_TYPE_INIT) { + sctp_timer_stop(SCTP_TIMER_TYPE_INIT, + stcb->sctp_ep, + stcb, + net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_2); + } + } +} + +/* INIT handler */ +static void +sctp_handle_init(struct mbuf *m, int iphlen, int offset, + struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, + struct sctp_init_chunk *cp, struct sctp_inpcb *inp, + struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_no_unlock, +#if defined(__FreeBSD__) && !defined(__Userspace__) + uint8_t mflowtype, uint32_t mflowid, +#endif + uint32_t vrf_id, uint16_t port) +{ + struct sctp_init *init; + struct mbuf *op_err; + + SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_init: handling INIT tcb:%p\n", + (void *)stcb); + if (stcb == NULL) { + SCTP_INP_RLOCK(inp); + } + /* validate length */ + if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_chunk)) { + op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); + sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, +#if defined(__FreeBSD__) && !defined(__Userspace__) + mflowtype, mflowid, +#endif + vrf_id, port); + if (stcb) + *abort_no_unlock = 1; + goto outnow; + } + /* validate parameters */ + init = &cp->init; + if (init->initiate_tag == 0) { + /* protocol error... send abort */ + op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); + sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, +#if defined(__FreeBSD__) && !defined(__Userspace__) + mflowtype, mflowid, +#endif + vrf_id, port); + if (stcb) + *abort_no_unlock = 1; + goto outnow; + } + if (ntohl(init->a_rwnd) < SCTP_MIN_RWND) { + /* invalid parameter... send abort */ + op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); + sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, +#if defined(__FreeBSD__) && !defined(__Userspace__) + mflowtype, mflowid, +#endif + vrf_id, port); + if (stcb) + *abort_no_unlock = 1; + goto outnow; + } + if (init->num_inbound_streams == 0) { + /* protocol error... send abort */ + op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); + sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, +#if defined(__FreeBSD__) && !defined(__Userspace__) + mflowtype, mflowid, +#endif + vrf_id, port); + if (stcb) + *abort_no_unlock = 1; + goto outnow; + } + if (init->num_outbound_streams == 0) { + /* protocol error... send abort */ + op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); + sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, +#if defined(__FreeBSD__) && !defined(__Userspace__) + mflowtype, mflowid, +#endif + vrf_id, port); + if (stcb) + *abort_no_unlock = 1; + goto outnow; + } + if (sctp_validate_init_auth_params(m, offset + sizeof(*cp), + offset + ntohs(cp->ch.chunk_length))) { + /* auth parameter(s) error... send abort */ + op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), + "Problem with AUTH parameters"); + sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, +#if defined(__FreeBSD__) && !defined(__Userspace__) + mflowtype, mflowid, +#endif + vrf_id, port); + if (stcb) + *abort_no_unlock = 1; + goto outnow; + } + /* We are only accepting if we have a listening socket.*/ + if ((stcb == NULL) && + ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || + (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) || + (!SCTP_IS_LISTENING(inp)))) { + /* + * FIX ME ?? What about TCP model and we have a + * match/restart case? Actually no fix is needed. + * the lookup will always find the existing assoc so stcb + * would not be NULL. It may be questionable to do this + * since we COULD just send back the INIT-ACK and hope that + * the app did accept()'s by the time the COOKIE was sent. But + * there is a price to pay for COOKIE generation and I don't + * want to pay it on the chance that the app will actually do + * some accepts(). The App just looses and should NOT be in + * this state :-) + */ + if (SCTP_BASE_SYSCTL(sctp_blackhole) == 0) { + op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), + "No listener"); + sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err, +#if defined(__FreeBSD__) && !defined(__Userspace__) + mflowtype, mflowid, inp->fibnum, +#endif + vrf_id, port); + } + goto outnow; + } + if ((stcb != NULL) && + (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT)) { + SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending SHUTDOWN-ACK\n"); + sctp_send_shutdown_ack(stcb, NULL); + sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); + } else { + SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n"); + sctp_send_initiate_ack(inp, stcb, net, m, iphlen, offset, + src, dst, sh, cp, +#if defined(__FreeBSD__) && !defined(__Userspace__) + mflowtype, mflowid, +#endif + vrf_id, port); + } + outnow: + if (stcb == NULL) { + SCTP_INP_RUNLOCK(inp); + } +} + +/* + * process peer "INIT/INIT-ACK" chunk returns value < 0 on error + */ + +int +sctp_is_there_unsent_data(struct sctp_tcb *stcb, int so_locked) +{ + int unsent_data; + unsigned int i; + struct sctp_stream_queue_pending *sp; + struct sctp_association *asoc; + + /* This function returns if any stream has true unsent data on it. + * Note that as it looks through it will clean up any places that + * have old data that has been sent but left at top of stream queue. + */ + asoc = &stcb->asoc; + unsent_data = 0; + SCTP_TCB_SEND_LOCK(stcb); + if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { + /* Check to see if some data queued */ + for (i = 0; i < stcb->asoc.streamoutcnt; i++) { + /*sa_ignore FREED_MEMORY*/ + sp = TAILQ_FIRST(&stcb->asoc.strmout[i].outqueue); + if (sp == NULL) { + continue; + } + if ((sp->msg_is_complete) && + (sp->length == 0) && + (sp->sender_all_done)) { + /* We are doing differed cleanup. Last + * time through when we took all the data + * the sender_all_done was not set. + */ + if (sp->put_last_out == 0) { + SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n"); + SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n", + sp->sender_all_done, + sp->length, + sp->msg_is_complete, + sp->put_last_out); + } + atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1); + TAILQ_REMOVE(&stcb->asoc.strmout[i].outqueue, sp, next); + stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, &asoc->strmout[i], sp, 1); + if (sp->net) { + sctp_free_remote_addr(sp->net); + sp->net = NULL; + } + if (sp->data) { + sctp_m_freem(sp->data); + sp->data = NULL; + } + sctp_free_a_strmoq(stcb, sp, so_locked); + if (!TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) { + unsent_data++; + } + } else { + unsent_data++; + } + if (unsent_data > 0) { + break; + } + } + } + SCTP_TCB_SEND_UNLOCK(stcb); + return (unsent_data); +} + +static int +sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb) +{ + struct sctp_init *init; + struct sctp_association *asoc; + struct sctp_nets *lnet; + unsigned int i; + + init = &cp->init; + asoc = &stcb->asoc; + /* save off parameters */ + asoc->peer_vtag = ntohl(init->initiate_tag); + asoc->peers_rwnd = ntohl(init->a_rwnd); + /* init tsn's */ + asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1; + + if (!TAILQ_EMPTY(&asoc->nets)) { + /* update any ssthresh's that may have a default */ + TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) { + lnet->ssthresh = asoc->peers_rwnd; + if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE|SCTP_CWND_LOGGING_ENABLE)) { + sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION); + } + + } + } + SCTP_TCB_SEND_LOCK(stcb); + if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) { + unsigned int newcnt; + struct sctp_stream_out *outs; + struct sctp_stream_queue_pending *sp, *nsp; + struct sctp_tmit_chunk *chk, *nchk; + + /* abandon the upper streams */ + newcnt = ntohs(init->num_inbound_streams); + TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) { + if (chk->rec.data.sid >= newcnt) { + TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next); + asoc->send_queue_cnt--; + if (asoc->strmout[chk->rec.data.sid].chunks_on_queues > 0) { + asoc->strmout[chk->rec.data.sid].chunks_on_queues--; +#ifdef INVARIANTS + } else { + panic("No chunks on the queues for sid %u.", chk->rec.data.sid); +#endif + } + if (chk->data != NULL) { + sctp_free_bufspace(stcb, asoc, chk, 1); + sctp_ulp_notify(SCTP_NOTIFY_UNSENT_DG_FAIL, stcb, + 0, chk, SCTP_SO_NOT_LOCKED); + if (chk->data) { + sctp_m_freem(chk->data); + chk->data = NULL; + } + } + sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); + /*sa_ignore FREED_MEMORY*/ + } + } + if (asoc->strmout) { + for (i = newcnt; i < asoc->pre_open_streams; i++) { + outs = &asoc->strmout[i]; + TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) { + atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1); + TAILQ_REMOVE(&outs->outqueue, sp, next); + stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, outs, sp, 1); + sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL, + stcb, 0, sp, SCTP_SO_NOT_LOCKED); + if (sp->data) { + sctp_m_freem(sp->data); + sp->data = NULL; + } + if (sp->net) { + sctp_free_remote_addr(sp->net); + sp->net = NULL; + } + /* Free the chunk */ + sctp_free_a_strmoq(stcb, sp, SCTP_SO_NOT_LOCKED); + /*sa_ignore FREED_MEMORY*/ + } + outs->state = SCTP_STREAM_CLOSED; + } + } + /* cut back the count */ + asoc->pre_open_streams = newcnt; + } + SCTP_TCB_SEND_UNLOCK(stcb); + asoc->streamoutcnt = asoc->pre_open_streams; + if (asoc->strmout) { + for (i = 0; i < asoc->streamoutcnt; i++) { + asoc->strmout[i].state = SCTP_STREAM_OPEN; + } + } + /* EY - nr_sack: initialize highest tsn in nr_mapping_array */ + asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { + sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); + } + /* This is the next one we expect */ + asoc->str_reset_seq_in = asoc->asconf_seq_in + 1; + + asoc->mapping_array_base_tsn = ntohl(init->initial_tsn); + asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in; + + asoc->advanced_peer_ack_point = asoc->last_acked_seq; + /* open the requested streams */ + + if (asoc->strmin != NULL) { + /* Free the old ones */ + for (i = 0; i < asoc->streamincnt; i++) { + sctp_clean_up_stream(stcb, &asoc->strmin[i].inqueue); + sctp_clean_up_stream(stcb, &asoc->strmin[i].uno_inqueue); + } + SCTP_FREE(asoc->strmin, SCTP_M_STRMI); + } + if (asoc->max_inbound_streams > ntohs(init->num_outbound_streams)) { + asoc->streamincnt = ntohs(init->num_outbound_streams); + } else { + asoc->streamincnt = asoc->max_inbound_streams; + } + SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt * + sizeof(struct sctp_stream_in), SCTP_M_STRMI); + if (asoc->strmin == NULL) { + /* we didn't get memory for the streams! */ + SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n"); + return (-1); + } + for (i = 0; i < asoc->streamincnt; i++) { + asoc->strmin[i].sid = i; + asoc->strmin[i].last_mid_delivered = 0xffffffff; + TAILQ_INIT(&asoc->strmin[i].inqueue); + TAILQ_INIT(&asoc->strmin[i].uno_inqueue); + asoc->strmin[i].pd_api_started = 0; + asoc->strmin[i].delivery_started = 0; + } + /* + * load_address_from_init will put the addresses into the + * association when the COOKIE is processed or the INIT-ACK is + * processed. Both types of COOKIE's existing and new call this + * routine. It will remove addresses that are no longer in the + * association (for the restarting case where addresses are + * removed). Up front when the INIT arrives we will discard it if it + * is a restart and new addresses have been added. + */ + /* sa_ignore MEMLEAK */ + return (0); +} + +/* + * INIT-ACK message processing/consumption returns value < 0 on error + */ +static int +sctp_process_init_ack(struct mbuf *m, int iphlen, int offset, + struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, + struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, + struct sctp_nets *net, int *abort_no_unlock, +#if defined(__FreeBSD__) && !defined(__Userspace__) + uint8_t mflowtype, uint32_t mflowid, +#endif + uint32_t vrf_id) +{ + struct sctp_association *asoc; + struct mbuf *op_err; + int retval, abort_flag, cookie_found; + int initack_limit; + int nat_friendly = 0; + + /* First verify that we have no illegal param's */ + abort_flag = 0; + cookie_found = 0; + + op_err = sctp_arethere_unrecognized_parameters(m, + (offset + sizeof(struct sctp_init_chunk)), + &abort_flag, (struct sctp_chunkhdr *)cp, + &nat_friendly, &cookie_found); + if (abort_flag) { + /* Send an abort and notify peer */ + sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); + *abort_no_unlock = 1; + return (-1); + } + if (!cookie_found) { + uint16_t len; + + /* Only report the missing cookie parameter */ + if (op_err != NULL) { + sctp_m_freem(op_err); + } + len = (uint16_t)(sizeof(struct sctp_error_missing_param) + sizeof(uint16_t)); + /* We abort with an error of missing mandatory param */ + op_err = sctp_get_mbuf_for_msg(len, 0, M_NOWAIT, 1, MT_DATA); + if (op_err != NULL) { + struct sctp_error_missing_param *cause; + + SCTP_BUF_LEN(op_err) = len; + cause = mtod(op_err, struct sctp_error_missing_param *); + /* Subtract the reserved param */ + cause->cause.code = htons(SCTP_CAUSE_MISSING_PARAM); + cause->cause.length = htons(len); + cause->num_missing_params = htonl(1); + cause->type[0] = htons(SCTP_STATE_COOKIE); + } + sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, + src, dst, sh, op_err, +#if defined(__FreeBSD__) && !defined(__Userspace__) + mflowtype, mflowid, +#endif + vrf_id, net->port); + *abort_no_unlock = 1; + return (-3); + } + asoc = &stcb->asoc; + asoc->peer_supports_nat = (uint8_t)nat_friendly; + /* process the peer's parameters in the INIT-ACK */ + retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb); + if (retval < 0) { + if (op_err != NULL) { + sctp_m_freem(op_err); + } + return (retval); + } + initack_limit = offset + ntohs(cp->ch.chunk_length); + /* load all addresses */ + if ((retval = sctp_load_addresses_from_init(stcb, m, + (offset + sizeof(struct sctp_init_chunk)), initack_limit, + src, dst, NULL, stcb->asoc.port))) { + if (op_err != NULL) { + sctp_m_freem(op_err); + } + op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), + "Problem with address parameters"); + SCTPDBG(SCTP_DEBUG_INPUT1, + "Load addresses from INIT causes an abort %d\n", + retval); + sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, + src, dst, sh, op_err, +#if defined(__FreeBSD__) && !defined(__Userspace__) + mflowtype, mflowid, +#endif + vrf_id, net->port); + *abort_no_unlock = 1; + return (-1); + } + /* if the peer doesn't support asconf, flush the asconf queue */ + if (asoc->asconf_supported == 0) { + struct sctp_asconf_addr *param, *nparam; + + TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) { + TAILQ_REMOVE(&asoc->asconf_queue, param, next); + SCTP_FREE(param, SCTP_M_ASC_ADDR); + } + } + + stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs, + stcb->asoc.local_hmacs); + if (op_err) { + sctp_queue_op_err(stcb, op_err); + /* queuing will steal away the mbuf chain to the out queue */ + op_err = NULL; + } + /* extract the cookie and queue it to "echo" it back... */ + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { + sctp_misc_ints(SCTP_THRESHOLD_CLEAR, + stcb->asoc.overall_error_count, + 0, + SCTP_FROM_SCTP_INPUT, + __LINE__); + } + stcb->asoc.overall_error_count = 0; + net->error_count = 0; + + /* + * Cancel the INIT timer, We do this first before queueing the + * cookie. We always cancel at the primary to assue that we are + * canceling the timer started by the INIT which always goes to the + * primary. + */ + sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb, + asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3); + + /* calculate the RTO */ + sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, + SCTP_RTT_FROM_NON_DATA); +#if defined(__Userspace__) + if (stcb->sctp_ep->recv_callback) { + if (stcb->sctp_socket) { + uint32_t inqueue_bytes, sb_free_now; + struct sctp_inpcb *inp; + + inp = stcb->sctp_ep; + inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk)); + sb_free_now = SCTP_SB_LIMIT_SND(stcb->sctp_socket) - (inqueue_bytes + stcb->asoc.sb_send_resv); + + /* check if the amount free in the send socket buffer crossed the threshold */ + if (inp->send_callback && + (((inp->send_sb_threshold > 0) && + (sb_free_now >= inp->send_sb_threshold) && + (stcb->asoc.chunks_on_out_queue <= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) || + (inp->send_sb_threshold == 0))) { + atomic_add_int(&stcb->asoc.refcnt, 1); + SCTP_TCB_UNLOCK(stcb); + inp->send_callback(stcb->sctp_socket, sb_free_now); + SCTP_TCB_LOCK(stcb); + atomic_subtract_int(&stcb->asoc.refcnt, 1); + } + } + } +#endif + retval = sctp_send_cookie_echo(m, offset, initack_limit, stcb, net); + return (retval); +} + +static void +sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp, + struct sctp_tcb *stcb, struct sctp_nets *net) +{ + union sctp_sockstore store; + struct sctp_nets *r_net, *f_net; + struct timeval tv; + int req_prim = 0; + uint16_t old_error_counter; + + if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) { + /* Invalid length */ + return; + } + + memset(&store, 0, sizeof(store)); + switch (cp->heartbeat.hb_info.addr_family) { +#ifdef INET + case AF_INET: + if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) { + store.sin.sin_family = cp->heartbeat.hb_info.addr_family; +#ifdef HAVE_SIN_LEN + store.sin.sin_len = cp->heartbeat.hb_info.addr_len; +#endif + store.sin.sin_port = stcb->rport; + memcpy(&store.sin.sin_addr, cp->heartbeat.hb_info.address, + sizeof(store.sin.sin_addr)); + } else { + return; + } + break; +#endif +#ifdef INET6 + case AF_INET6: + if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) { + store.sin6.sin6_family = cp->heartbeat.hb_info.addr_family; +#ifdef HAVE_SIN6_LEN + store.sin6.sin6_len = cp->heartbeat.hb_info.addr_len; +#endif + store.sin6.sin6_port = stcb->rport; + memcpy(&store.sin6.sin6_addr, cp->heartbeat.hb_info.address, sizeof(struct in6_addr)); + } else { + return; + } + break; +#endif +#if defined(__Userspace__) + case AF_CONN: + if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_conn)) { + store.sconn.sconn_family = cp->heartbeat.hb_info.addr_family; +#ifdef HAVE_SCONN_LEN + store.sconn.sconn_len = cp->heartbeat.hb_info.addr_len; +#endif + store.sconn.sconn_port = stcb->rport; + memcpy(&store.sconn.sconn_addr, cp->heartbeat.hb_info.address, sizeof(void *)); + } else { + return; + } + break; +#endif + default: + return; + } + r_net = sctp_findnet(stcb, &store.sa); + if (r_net == NULL) { + SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n"); + return; + } + if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) && + (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) && + (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) { + /* + * If the its a HB and it's random value is correct when can + * confirm the destination. + */ + r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED; + if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) { + stcb->asoc.primary_destination = r_net; + r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY; + f_net = TAILQ_FIRST(&stcb->asoc.nets); + if (f_net != r_net) { + /* first one on the list is NOT the primary + * sctp_cmpaddr() is much more efficient if + * the primary is the first on the list, make it + * so. + */ + TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next); + TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next); + } + req_prim = 1; + } + sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, + stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED); + sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, + r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4); + sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); + } + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { + sctp_misc_ints(SCTP_THRESHOLD_CLEAR, + stcb->asoc.overall_error_count, + 0, + SCTP_FROM_SCTP_INPUT, + __LINE__); + } + stcb->asoc.overall_error_count = 0; + old_error_counter = r_net->error_count; + r_net->error_count = 0; + r_net->hb_responded = 1; + tv.tv_sec = cp->heartbeat.hb_info.time_value_1; + tv.tv_usec = cp->heartbeat.hb_info.time_value_2; + /* Now lets do a RTO with this */ + sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, + SCTP_RTT_FROM_NON_DATA); + if (!(r_net->dest_state & SCTP_ADDR_REACHABLE)) { + r_net->dest_state |= SCTP_ADDR_REACHABLE; + sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb, + 0, (void *)r_net, SCTP_SO_NOT_LOCKED); + } + if (r_net->dest_state & SCTP_ADDR_PF) { + r_net->dest_state &= ~SCTP_ADDR_PF; + stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net); + } + if (old_error_counter > 0) { + sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, + stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_5); + sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); + } + if (r_net == stcb->asoc.primary_destination) { + if (stcb->asoc.alternate) { + /* release the alternate, primary is good */ + sctp_free_remote_addr(stcb->asoc.alternate); + stcb->asoc.alternate = NULL; + } + } + /* Mobility adaptation */ + if (req_prim) { + if ((sctp_is_mobility_feature_on(stcb->sctp_ep, + SCTP_MOBILITY_BASE) || + sctp_is_mobility_feature_on(stcb->sctp_ep, + SCTP_MOBILITY_FASTHANDOFF)) && + sctp_is_mobility_feature_on(stcb->sctp_ep, + SCTP_MOBILITY_PRIM_DELETED)) { + + sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED, + stcb->sctp_ep, stcb, NULL, + SCTP_FROM_SCTP_INPUT + SCTP_LOC_6); + if (sctp_is_mobility_feature_on(stcb->sctp_ep, + SCTP_MOBILITY_FASTHANDOFF)) { + sctp_assoc_immediate_retrans(stcb, + stcb->asoc.primary_destination); + } + if (sctp_is_mobility_feature_on(stcb->sctp_ep, + SCTP_MOBILITY_BASE)) { + sctp_move_chunks_from_net(stcb, + stcb->asoc.deleted_primary); + } + sctp_delete_prim_timer(stcb->sctp_ep, stcb); + } + } +} + +static int +sctp_handle_nat_colliding_state(struct sctp_tcb *stcb) +{ + /* + * Return 0 means we want you to proceed with the abort + * non-zero means no abort processing. + */ + uint32_t new_vtag; + struct sctpasochead *head; + + if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) || + (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { + new_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); + atomic_add_int(&stcb->asoc.refcnt, 1); + SCTP_TCB_UNLOCK(stcb); + SCTP_INP_INFO_WLOCK(); + SCTP_TCB_LOCK(stcb); + atomic_subtract_int(&stcb->asoc.refcnt, 1); + } else { + return (0); + } + if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) { + /* generate a new vtag and send init */ + LIST_REMOVE(stcb, sctp_asocs); + stcb->asoc.my_vtag = new_vtag; + head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; + /* put it in the bucket in the vtag hash of assoc's for the system */ + LIST_INSERT_HEAD(head, stcb, sctp_asocs); + SCTP_INP_INFO_WUNLOCK(); + sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); + return (1); + } else { + /* treat like a case where the cookie expired i.e.: + * - dump current cookie. + * - generate a new vtag. + * - resend init. + */ + /* generate a new vtag and send init */ + LIST_REMOVE(stcb, sctp_asocs); + SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT); + sctp_stop_all_cookie_timers(stcb); + sctp_toss_old_cookies(stcb, &stcb->asoc); + stcb->asoc.my_vtag = new_vtag; + head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; + /* put it in the bucket in the vtag hash of assoc's for the system */ + LIST_INSERT_HEAD(head, stcb, sctp_asocs); + SCTP_INP_INFO_WUNLOCK(); + sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); + return (1); + } + return (0); +} + +static int +sctp_handle_nat_missing_state(struct sctp_tcb *stcb, + struct sctp_nets *net) +{ + /* return 0 means we want you to proceed with the abort + * non-zero means no abort processing + */ + if (stcb->asoc.auth_supported == 0) { + SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n"); + return (0); + } + sctp_asconf_send_nat_state_update(stcb, net); + return (1); +} + + +/* Returns 1 if the stcb was aborted, 0 otherwise */ +static int +sctp_handle_abort(struct sctp_abort_chunk *abort, + struct sctp_tcb *stcb, struct sctp_nets *net) +{ +#if defined(__APPLE__) && !defined(__Userspace__) + struct socket *so; +#endif + uint16_t len; + uint16_t error; + + SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n"); + if (stcb == NULL) + return (0); + + len = ntohs(abort->ch.chunk_length); + if (len >= sizeof(struct sctp_chunkhdr) + sizeof(struct sctp_error_cause)) { + /* Need to check the cause codes for our + * two magic nat aborts which don't kill the assoc + * necessarily. + */ + struct sctp_error_cause *cause; + + cause = (struct sctp_error_cause *)(abort + 1); + error = ntohs(cause->code); + if (error == SCTP_CAUSE_NAT_COLLIDING_STATE) { + SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n", + abort->ch.chunk_flags); + if (sctp_handle_nat_colliding_state(stcb)) { + return (0); + } + } else if (error == SCTP_CAUSE_NAT_MISSING_STATE) { + SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n", + abort->ch.chunk_flags); + if (sctp_handle_nat_missing_state(stcb, net)) { + return (0); + } + } + } else { + error = 0; + } + /* stop any receive timers */ + sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, NULL, + SCTP_FROM_SCTP_INPUT + SCTP_LOC_7); + /* notify user of the abort and clean up... */ + sctp_abort_notification(stcb, 1, error, abort, SCTP_SO_NOT_LOCKED); + /* free the tcb */ + SCTP_STAT_INCR_COUNTER32(sctps_aborted); + if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) || + (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) { + SCTP_STAT_DECR_GAUGE32(sctps_currestab); + } +#ifdef SCTP_ASOCLOG_OF_TSNS + sctp_print_out_track_log(stcb); +#endif +#if defined(__APPLE__) && !defined(__Userspace__) + so = SCTP_INP_SO(stcb->sctp_ep); + atomic_add_int(&stcb->asoc.refcnt, 1); + SCTP_TCB_UNLOCK(stcb); + SCTP_SOCKET_LOCK(so, 1); + SCTP_TCB_LOCK(stcb); + atomic_subtract_int(&stcb->asoc.refcnt, 1); +#endif + SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_WAS_ABORTED); + (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, + SCTP_FROM_SCTP_INPUT + SCTP_LOC_8); +#if defined(__APPLE__) && !defined(__Userspace__) + SCTP_SOCKET_UNLOCK(so, 1); +#endif + SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n"); + return (1); +} + +static void +sctp_start_net_timers(struct sctp_tcb *stcb) +{ + uint32_t cnt_hb_sent; + struct sctp_nets *net; + + cnt_hb_sent = 0; + TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { + /* For each network start: + * 1) A pmtu timer. + * 2) A HB timer + * 3) If the dest in unconfirmed send + * a hb as well if under max_hb_burst have + * been sent. + */ + sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net); + sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net); + if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) && + (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) { + sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); + cnt_hb_sent++; + } + } + if (cnt_hb_sent) { + sctp_chunk_output(stcb->sctp_ep, stcb, + SCTP_OUTPUT_FROM_COOKIE_ACK, + SCTP_SO_NOT_LOCKED); + } +} + + +static void +sctp_handle_shutdown(struct sctp_shutdown_chunk *cp, + struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag) +{ + struct sctp_association *asoc; + int some_on_streamwheel; + int old_state; +#if defined(__APPLE__) && !defined(__Userspace__) + struct socket *so; +#endif + + SCTPDBG(SCTP_DEBUG_INPUT2, + "sctp_handle_shutdown: handling SHUTDOWN\n"); + if (stcb == NULL) + return; + asoc = &stcb->asoc; + if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) || + (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { + return; + } + if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) { + /* Shutdown NOT the expected size */ + return; + } + old_state = SCTP_GET_STATE(stcb); + sctp_update_acked(stcb, cp, abort_flag); + if (*abort_flag) { + return; + } + if (asoc->control_pdapi) { + /* With a normal shutdown + * we assume the end of last record. + */ + SCTP_INP_READ_LOCK(stcb->sctp_ep); + if (asoc->control_pdapi->on_strm_q) { + struct sctp_stream_in *strm; + + strm = &asoc->strmin[asoc->control_pdapi->sinfo_stream]; + if (asoc->control_pdapi->on_strm_q == SCTP_ON_UNORDERED) { + /* Unordered */ + TAILQ_REMOVE(&strm->uno_inqueue, asoc->control_pdapi, next_instrm); + asoc->control_pdapi->on_strm_q = 0; + } else if (asoc->control_pdapi->on_strm_q == SCTP_ON_ORDERED) { + /* Ordered */ + TAILQ_REMOVE(&strm->inqueue, asoc->control_pdapi, next_instrm); + asoc->control_pdapi->on_strm_q = 0; +#ifdef INVARIANTS + } else { + panic("Unknown state on ctrl:%p on_strm_q:%d", + asoc->control_pdapi, + asoc->control_pdapi->on_strm_q); +#endif + } + } + asoc->control_pdapi->end_added = 1; + asoc->control_pdapi->pdapi_aborted = 1; + asoc->control_pdapi = NULL; + SCTP_INP_READ_UNLOCK(stcb->sctp_ep); +#if defined(__APPLE__) && !defined(__Userspace__) + so = SCTP_INP_SO(stcb->sctp_ep); + atomic_add_int(&stcb->asoc.refcnt, 1); + SCTP_TCB_UNLOCK(stcb); + SCTP_SOCKET_LOCK(so, 1); + SCTP_TCB_LOCK(stcb); + atomic_subtract_int(&stcb->asoc.refcnt, 1); + if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { + /* assoc was freed while we were unlocked */ + SCTP_SOCKET_UNLOCK(so, 1); + return; + } +#endif + if (stcb->sctp_socket) { + sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); + } +#if defined(__APPLE__) && !defined(__Userspace__) + SCTP_SOCKET_UNLOCK(so, 1); +#endif + } + /* goto SHUTDOWN_RECEIVED state to block new requests */ + if (stcb->sctp_socket) { + if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) && + (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) && + (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT)) { + SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_RECEIVED); + /* notify upper layer that peer has initiated a shutdown */ + sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); + + /* reset time */ + (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); + } + } + if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) { + /* + * stop the shutdown timer, since we WILL move to + * SHUTDOWN-ACK-SENT. + */ + sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, + net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9); + } + /* Now is there unsent data on a stream somewhere? */ + some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED); + + if (!TAILQ_EMPTY(&asoc->send_queue) || + !TAILQ_EMPTY(&asoc->sent_queue) || + some_on_streamwheel) { + /* By returning we will push more data out */ + return; + } else { + /* no outstanding data to send, so move on... */ + /* send SHUTDOWN-ACK */ + /* move to SHUTDOWN-ACK-SENT state */ + if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) || + (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) { + SCTP_STAT_DECR_GAUGE32(sctps_currestab); + } + if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) { + SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_ACK_SENT); + sctp_stop_timers_for_shutdown(stcb); + sctp_send_shutdown_ack(stcb, net); + sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, + stcb->sctp_ep, stcb, net); + } else if (old_state == SCTP_STATE_SHUTDOWN_ACK_SENT) { + sctp_send_shutdown_ack(stcb, net); + } + } +} + +static void +sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED, + struct sctp_tcb *stcb, + struct sctp_nets *net) +{ + struct sctp_association *asoc; +#if defined(__APPLE__) && !defined(__Userspace__) + struct socket *so; + + so = SCTP_INP_SO(stcb->sctp_ep); +#endif + SCTPDBG(SCTP_DEBUG_INPUT2, + "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n"); + if (stcb == NULL) + return; + + asoc = &stcb->asoc; + /* process according to association state */ + if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) || + (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { + /* unexpected SHUTDOWN-ACK... do OOTB handling... */ + sctp_send_shutdown_complete(stcb, net, 1); + SCTP_TCB_UNLOCK(stcb); + return; + } + if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) && + (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) { + /* unexpected SHUTDOWN-ACK... so ignore... */ + SCTP_TCB_UNLOCK(stcb); + return; + } + if (asoc->control_pdapi) { + /* With a normal shutdown + * we assume the end of last record. + */ + SCTP_INP_READ_LOCK(stcb->sctp_ep); + asoc->control_pdapi->end_added = 1; + asoc->control_pdapi->pdapi_aborted = 1; + asoc->control_pdapi = NULL; + SCTP_INP_READ_UNLOCK(stcb->sctp_ep); +#if defined(__APPLE__) && !defined(__Userspace__) + atomic_add_int(&stcb->asoc.refcnt, 1); + SCTP_TCB_UNLOCK(stcb); + SCTP_SOCKET_LOCK(so, 1); + SCTP_TCB_LOCK(stcb); + atomic_subtract_int(&stcb->asoc.refcnt, 1); + if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { + /* assoc was freed while we were unlocked */ + SCTP_SOCKET_UNLOCK(so, 1); + return; + } +#endif + sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); +#if defined(__APPLE__) && !defined(__Userspace__) + SCTP_SOCKET_UNLOCK(so, 1); +#endif + } +#ifdef INVARIANTS + if (!TAILQ_EMPTY(&asoc->send_queue) || + !TAILQ_EMPTY(&asoc->sent_queue) || + sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) { + panic("Queues are not empty when handling SHUTDOWN-ACK"); + } +#endif + /* stop the timer */ + sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, + SCTP_FROM_SCTP_INPUT + SCTP_LOC_10); + /* send SHUTDOWN-COMPLETE */ + sctp_send_shutdown_complete(stcb, net, 0); + /* notify upper layer protocol */ + if (stcb->sctp_socket) { + if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || + (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { + stcb->sctp_socket->so_snd.sb_cc = 0; + } + sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); + } + SCTP_STAT_INCR_COUNTER32(sctps_shutdown); + /* free the TCB but first save off the ep */ +#if defined(__APPLE__) && !defined(__Userspace__) + atomic_add_int(&stcb->asoc.refcnt, 1); + SCTP_TCB_UNLOCK(stcb); + SCTP_SOCKET_LOCK(so, 1); + SCTP_TCB_LOCK(stcb); + atomic_subtract_int(&stcb->asoc.refcnt, 1); +#endif + (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, + SCTP_FROM_SCTP_INPUT + SCTP_LOC_11); +#if defined(__APPLE__) && !defined(__Userspace__) + SCTP_SOCKET_UNLOCK(so, 1); +#endif +} + +static void +sctp_process_unrecog_chunk(struct sctp_tcb *stcb, uint8_t chunk_type) +{ + switch (chunk_type) { + case SCTP_ASCONF_ACK: + case SCTP_ASCONF: + sctp_asconf_cleanup(stcb); + break; + case SCTP_IFORWARD_CUM_TSN: + case SCTP_FORWARD_CUM_TSN: + stcb->asoc.prsctp_supported = 0; + break; + default: + SCTPDBG(SCTP_DEBUG_INPUT2, + "Peer does not support chunk type %d (0x%x).\n", + chunk_type, chunk_type); + break; + } +} + +/* + * Skip past the param header and then we will find the param that caused the + * problem. There are a number of param's in a ASCONF OR the prsctp param + * these will turn of specific features. + * XXX: Is this the right thing to do? + */ +static void +sctp_process_unrecog_param(struct sctp_tcb *stcb, uint16_t parameter_type) +{ + switch (parameter_type) { + /* pr-sctp draft */ + case SCTP_PRSCTP_SUPPORTED: + stcb->asoc.prsctp_supported = 0; + break; + case SCTP_SUPPORTED_CHUNK_EXT: + break; + /* draft-ietf-tsvwg-addip-sctp */ + case SCTP_HAS_NAT_SUPPORT: + stcb->asoc.peer_supports_nat = 0; + break; + case SCTP_ADD_IP_ADDRESS: + case SCTP_DEL_IP_ADDRESS: + case SCTP_SET_PRIM_ADDR: + stcb->asoc.asconf_supported = 0; + break; + case SCTP_SUCCESS_REPORT: + case SCTP_ERROR_CAUSE_IND: + SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n"); + SCTPDBG(SCTP_DEBUG_INPUT2, + "Turning off ASCONF to this strange peer\n"); + stcb->asoc.asconf_supported = 0; + break; + default: + SCTPDBG(SCTP_DEBUG_INPUT2, + "Peer does not support param type %d (0x%x)??\n", + parameter_type, parameter_type); + break; + } +} + +static int +sctp_handle_error(struct sctp_chunkhdr *ch, + struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) +{ + struct sctp_error_cause *cause; + struct sctp_association *asoc; + uint32_t remaining_length, adjust; + uint16_t code, cause_code, cause_length; +#if defined(__APPLE__) && !defined(__Userspace__) + struct socket *so; +#endif + + /* parse through all of the errors and process */ + asoc = &stcb->asoc; + cause = (struct sctp_error_cause *)((caddr_t)ch + + sizeof(struct sctp_chunkhdr)); + remaining_length = ntohs(ch->chunk_length); + if (remaining_length > limit) { + remaining_length = limit; + } + if (remaining_length >= sizeof(struct sctp_chunkhdr)) { + remaining_length -= sizeof(struct sctp_chunkhdr); + } else { + remaining_length = 0; + } + code = 0; + while (remaining_length >= sizeof(struct sctp_error_cause)) { + /* Process an Error Cause */ + cause_code = ntohs(cause->code); + cause_length = ntohs(cause->length); + if ((cause_length > remaining_length) || (cause_length == 0)) { + /* Invalid cause length, possibly due to truncation. */ + SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in cause - bytes left: %u cause length: %u\n", + remaining_length, cause_length); + return (0); + } + if (code == 0) { + /* report the first error cause */ + code = cause_code; + } + switch (cause_code) { + case SCTP_CAUSE_INVALID_STREAM: + case SCTP_CAUSE_MISSING_PARAM: + case SCTP_CAUSE_INVALID_PARAM: + case SCTP_CAUSE_NO_USER_DATA: + SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %u back? We have a bug :/ (or do they?)\n", + cause_code); + break; + case SCTP_CAUSE_NAT_COLLIDING_STATE: + SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags: %x\n", + ch->chunk_flags); + if (sctp_handle_nat_colliding_state(stcb)) { + return (0); + } + break; + case SCTP_CAUSE_NAT_MISSING_STATE: + SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags: %x\n", + ch->chunk_flags); + if (sctp_handle_nat_missing_state(stcb, net)) { + return (0); + } + break; + case SCTP_CAUSE_STALE_COOKIE: + /* + * We only act if we have echoed a cookie and are + * waiting. + */ + if ((cause_length >= sizeof(struct sctp_error_stale_cookie)) && + (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { + struct sctp_error_stale_cookie *stale_cookie; + + stale_cookie = (struct sctp_error_stale_cookie *)cause; + asoc->cookie_preserve_req = ntohl(stale_cookie->stale_time); + /* Double it to be more robust on RTX */ + if (asoc->cookie_preserve_req <= UINT32_MAX / 2) { + asoc->cookie_preserve_req *= 2; + } else { + asoc->cookie_preserve_req = UINT32_MAX; + } + asoc->stale_cookie_count++; + if (asoc->stale_cookie_count > + asoc->max_init_times) { + sctp_abort_notification(stcb, 0, 0, NULL, SCTP_SO_NOT_LOCKED); + /* now free the asoc */ +#if defined(__APPLE__) && !defined(__Userspace__) + so = SCTP_INP_SO(stcb->sctp_ep); + atomic_add_int(&stcb->asoc.refcnt, 1); + SCTP_TCB_UNLOCK(stcb); + SCTP_SOCKET_LOCK(so, 1); + SCTP_TCB_LOCK(stcb); + atomic_subtract_int(&stcb->asoc.refcnt, 1); +#endif + (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, + SCTP_FROM_SCTP_INPUT + SCTP_LOC_12); +#if defined(__APPLE__) && !defined(__Userspace__) + SCTP_SOCKET_UNLOCK(so, 1); +#endif + return (-1); + } + /* blast back to INIT state */ + sctp_toss_old_cookies(stcb, &stcb->asoc); + SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT); + sctp_stop_all_cookie_timers(stcb); + sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); + } + break; + case SCTP_CAUSE_UNRESOLVABLE_ADDR: + /* + * Nothing we can do here, we don't do hostname + * addresses so if the peer does not like my IPv6 + * (or IPv4 for that matter) it does not matter. If + * they don't support that type of address, they can + * NOT possibly get that packet type... i.e. with no + * IPv6 you can't receive a IPv6 packet. so we can + * safely ignore this one. If we ever added support + * for HOSTNAME Addresses, then we would need to do + * something here. + */ + break; + case SCTP_CAUSE_UNRECOG_CHUNK: + if (cause_length >= sizeof(struct sctp_error_unrecognized_chunk)) { + struct sctp_error_unrecognized_chunk *unrec_chunk; + + unrec_chunk = (struct sctp_error_unrecognized_chunk *)cause; + sctp_process_unrecog_chunk(stcb, unrec_chunk->ch.chunk_type); + } + break; + case SCTP_CAUSE_UNRECOG_PARAM: + /* XXX: We only consider the first parameter */ + if (cause_length >= sizeof(struct sctp_error_cause) + sizeof(struct sctp_paramhdr)) { + struct sctp_paramhdr *unrec_parameter; + + unrec_parameter = (struct sctp_paramhdr *)(cause + 1); + sctp_process_unrecog_param(stcb, ntohs(unrec_parameter->param_type)); + } + break; + case SCTP_CAUSE_COOKIE_IN_SHUTDOWN: + /* + * We ignore this since the timer will drive out a + * new cookie anyway and there timer will drive us + * to send a SHUTDOWN_COMPLETE. We can't send one + * here since we don't have their tag. + */ + break; + case SCTP_CAUSE_DELETING_LAST_ADDR: + case SCTP_CAUSE_RESOURCE_SHORTAGE: + case SCTP_CAUSE_DELETING_SRC_ADDR: + /* + * We should NOT get these here, but in a + * ASCONF-ACK. + */ + SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a error cause with code %u.\n", + cause_code); + break; + case SCTP_CAUSE_OUT_OF_RESC: + /* + * And what, pray tell do we do with the fact that + * the peer is out of resources? Not really sure we + * could do anything but abort. I suspect this + * should have came WITH an abort instead of in a + * OP-ERROR. + */ + break; + default: + SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown code 0x%x\n", + cause_code); + break; + } + adjust = SCTP_SIZE32(cause_length); + if (remaining_length >= adjust) { + remaining_length -= adjust; + } else { + remaining_length = 0; + } + cause = (struct sctp_error_cause *)((caddr_t)cause + adjust); + } + sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, code, ch, SCTP_SO_NOT_LOCKED); + return (0); +} + +static int +sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset, + struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, + struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, + struct sctp_nets *net, int *abort_no_unlock, +#if defined(__FreeBSD__) && !defined(__Userspace__) + uint8_t mflowtype, uint32_t mflowid, +#endif + uint32_t vrf_id) +{ + struct sctp_init_ack *init_ack; + struct mbuf *op_err; + + SCTPDBG(SCTP_DEBUG_INPUT2, + "sctp_handle_init_ack: handling INIT-ACK\n"); + + if (stcb == NULL) { + SCTPDBG(SCTP_DEBUG_INPUT2, + "sctp_handle_init_ack: TCB is null\n"); + return (-1); + } + if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) { + /* Invalid length */ + op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); + sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, + src, dst, sh, op_err, +#if defined(__FreeBSD__) && !defined(__Userspace__) + mflowtype, mflowid, +#endif + vrf_id, net->port); + *abort_no_unlock = 1; + return (-1); + } + init_ack = &cp->init; + /* validate parameters */ + if (init_ack->initiate_tag == 0) { + /* protocol error... send an abort */ + op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); + sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, + src, dst, sh, op_err, +#if defined(__FreeBSD__) && !defined(__Userspace__) + mflowtype, mflowid, +#endif + vrf_id, net->port); + *abort_no_unlock = 1; + return (-1); + } + if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) { + /* protocol error... send an abort */ + op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); + sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, + src, dst, sh, op_err, +#if defined(__FreeBSD__) && !defined(__Userspace__) + mflowtype, mflowid, +#endif + vrf_id, net->port); + *abort_no_unlock = 1; + return (-1); + } + if (init_ack->num_inbound_streams == 0) { + /* protocol error... send an abort */ + op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); + sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, + src, dst, sh, op_err, +#if defined(__FreeBSD__) && !defined(__Userspace__) + mflowtype, mflowid, +#endif + vrf_id, net->port); + *abort_no_unlock = 1; + return (-1); + } + if (init_ack->num_outbound_streams == 0) { + /* protocol error... send an abort */ + op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); + sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, + src, dst, sh, op_err, +#if defined(__FreeBSD__) && !defined(__Userspace__) + mflowtype, mflowid, +#endif + vrf_id, net->port); + *abort_no_unlock = 1; + return (-1); + } + /* process according to association state... */ + switch (SCTP_GET_STATE(stcb)) { + case SCTP_STATE_COOKIE_WAIT: + /* this is the expected state for this chunk */ + /* process the INIT-ACK parameters */ + if (stcb->asoc.primary_destination->dest_state & + SCTP_ADDR_UNCONFIRMED) { + /* + * The primary is where we sent the INIT, we can + * always consider it confirmed when the INIT-ACK is + * returned. Do this before we load addresses + * though. + */ + stcb->asoc.primary_destination->dest_state &= + ~SCTP_ADDR_UNCONFIRMED; + sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, + stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED); + } + if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb, + net, abort_no_unlock, +#if defined(__FreeBSD__) && !defined(__Userspace__) + mflowtype, mflowid, +#endif + vrf_id) < 0) { + /* error in parsing parameters */ + return (-1); + } + /* update our state */ + SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n"); + SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_ECHOED); + + /* reset the RTO calc */ + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { + sctp_misc_ints(SCTP_THRESHOLD_CLEAR, + stcb->asoc.overall_error_count, + 0, + SCTP_FROM_SCTP_INPUT, + __LINE__); + } + stcb->asoc.overall_error_count = 0; + (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); + /* + * collapse the init timer back in case of a exponential + * backoff + */ + sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep, + stcb, net); + /* + * the send at the end of the inbound data processing will + * cause the cookie to be sent + */ + break; + case SCTP_STATE_SHUTDOWN_SENT: + /* incorrect state... discard */ + break; + case SCTP_STATE_COOKIE_ECHOED: + /* incorrect state... discard */ + break; + case SCTP_STATE_OPEN: + /* incorrect state... discard */ + break; + case SCTP_STATE_EMPTY: + case SCTP_STATE_INUSE: + default: + /* incorrect state... discard */ + return (-1); + break; + } + SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n"); + return (0); +} + +static struct sctp_tcb * +sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, + struct sockaddr *src, struct sockaddr *dst, + struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, + struct sctp_inpcb *inp, struct sctp_nets **netp, + struct sockaddr *init_src, int *notification, + int auth_skipped, uint32_t auth_offset, uint32_t auth_len, +#if defined(__FreeBSD__) && !defined(__Userspace__) + uint8_t mflowtype, uint32_t mflowid, +#endif + uint32_t vrf_id, uint16_t port); + + +/* + * handle a state cookie for an existing association m: input packet mbuf + * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a + * "split" mbuf and the cookie signature does not exist offset: offset into + * mbuf to the cookie-echo chunk + */ +static struct sctp_tcb * +sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset, + struct sockaddr *src, struct sockaddr *dst, + struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, + struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp, + struct sockaddr *init_src, int *notification, + int auth_skipped, uint32_t auth_offset, uint32_t auth_len, +#if defined(__FreeBSD__) && !defined(__Userspace__) + uint8_t mflowtype, uint32_t mflowid, +#endif + uint32_t vrf_id, uint16_t port) +{ + struct sctp_association *asoc; + struct sctp_init_chunk *init_cp, init_buf; + struct sctp_init_ack_chunk *initack_cp, initack_buf; + struct sctp_asconf_addr *aparam, *naparam; + struct sctp_asconf_ack *aack, *naack; + struct sctp_tmit_chunk *chk, *nchk; + struct sctp_stream_reset_list *strrst, *nstrrst; + struct sctp_queued_to_read *sq, *nsq; + struct sctp_nets *net; + struct mbuf *op_err; + struct timeval old; + int init_offset, initack_offset, i; + int retval; + int spec_flag = 0; + uint32_t how_indx; +#if defined(SCTP_DETAILED_STR_STATS) + int j; +#endif + + net = *netp; + /* I know that the TCB is non-NULL from the caller */ + asoc = &stcb->asoc; + for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) { + if (asoc->cookie_how[how_indx] == 0) + break; + } + if (how_indx < sizeof(asoc->cookie_how)) { + asoc->cookie_how[how_indx] = 1; + } + if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) { + /* SHUTDOWN came in after sending INIT-ACK */ + sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination); + op_err = sctp_generate_cause(SCTP_CAUSE_COOKIE_IN_SHUTDOWN, ""); + sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, +#if defined(__FreeBSD__) && !defined(__Userspace__) + mflowtype, mflowid, inp->fibnum, +#endif + vrf_id, net->port); + if (how_indx < sizeof(asoc->cookie_how)) + asoc->cookie_how[how_indx] = 2; + return (NULL); + } + /* + * find and validate the INIT chunk in the cookie (peer's info) the + * INIT should start after the cookie-echo header struct (chunk + * header, state cookie header struct) + */ + init_offset = offset += sizeof(struct sctp_cookie_echo_chunk); + + init_cp = (struct sctp_init_chunk *) + sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), + (uint8_t *) & init_buf); + if (init_cp == NULL) { + /* could not pull a INIT chunk in cookie */ + return (NULL); + } + if (init_cp->ch.chunk_type != SCTP_INITIATION) { + return (NULL); + } + /* + * find and validate the INIT-ACK chunk in the cookie (my info) the + * INIT-ACK follows the INIT chunk + */ + initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); + initack_cp = (struct sctp_init_ack_chunk *) + sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), + (uint8_t *) & initack_buf); + if (initack_cp == NULL) { + /* could not pull INIT-ACK chunk in cookie */ + return (NULL); + } + if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { + return (NULL); + } + if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && + (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) { + /* + * case D in Section 5.2.4 Table 2: MMAA process accordingly + * to get into the OPEN state + */ + if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { + /*- + * Opps, this means that we somehow generated two vtag's + * the same. I.e. we did: + * Us Peer + * <---INIT(tag=a)------ + * ----INIT-ACK(tag=t)--> + * ----INIT(tag=t)------> *1 + * <---INIT-ACK(tag=a)--- + * <----CE(tag=t)------------- *2 + * + * At point *1 we should be generating a different + * tag t'. Which means we would throw away the CE and send + * ours instead. Basically this is case C (throw away side). + */ + if (how_indx < sizeof(asoc->cookie_how)) + asoc->cookie_how[how_indx] = 17; + return (NULL); + + } + switch (SCTP_GET_STATE(stcb)) { + case SCTP_STATE_COOKIE_WAIT: + case SCTP_STATE_COOKIE_ECHOED: + /* + * INIT was sent but got a COOKIE_ECHO with the + * correct tags... just accept it...but we must + * process the init so that we can make sure we + * have the right seq no's. + */ + /* First we must process the INIT !! */ + retval = sctp_process_init(init_cp, stcb); + if (retval < 0) { + if (how_indx < sizeof(asoc->cookie_how)) + asoc->cookie_how[how_indx] = 3; + return (NULL); + } + /* we have already processed the INIT so no problem */ + sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, + stcb, net, + SCTP_FROM_SCTP_INPUT + SCTP_LOC_13); + sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, + stcb, net, + SCTP_FROM_SCTP_INPUT + SCTP_LOC_14); + /* update current state */ + if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) + SCTP_STAT_INCR_COUNTER32(sctps_activeestab); + else + SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); + + SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); + if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { + sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, + stcb->sctp_ep, stcb, NULL); + } + SCTP_STAT_INCR_GAUGE32(sctps_currestab); + sctp_stop_all_cookie_timers(stcb); + if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || + (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && + (!SCTP_IS_LISTENING(inp))) { +#if defined(__APPLE__) && !defined(__Userspace__) + struct socket *so; +#endif + /* + * Here is where collision would go if we + * did a connect() and instead got a + * init/init-ack/cookie done before the + * init-ack came back.. + */ + stcb->sctp_ep->sctp_flags |= + SCTP_PCB_FLAGS_CONNECTED; +#if defined(__APPLE__) && !defined(__Userspace__) + so = SCTP_INP_SO(stcb->sctp_ep); + atomic_add_int(&stcb->asoc.refcnt, 1); + SCTP_TCB_UNLOCK(stcb); + SCTP_SOCKET_LOCK(so, 1); + SCTP_TCB_LOCK(stcb); + atomic_add_int(&stcb->asoc.refcnt, -1); + if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { + SCTP_SOCKET_UNLOCK(so, 1); + return (NULL); + } +#endif + soisconnected(stcb->sctp_socket); +#if defined(__APPLE__) && !defined(__Userspace__) + SCTP_SOCKET_UNLOCK(so, 1); +#endif + } + /* notify upper layer */ + *notification = SCTP_NOTIFY_ASSOC_UP; + /* + * since we did not send a HB make sure we + * don't double things + */ + old.tv_sec = cookie->time_entered.tv_sec; + old.tv_usec = cookie->time_entered.tv_usec; + net->hb_responded = 1; + sctp_calculate_rto(stcb, asoc, net, &old, + SCTP_RTT_FROM_NON_DATA); + + if (stcb->asoc.sctp_autoclose_ticks && + (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) { + sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, + inp, stcb, NULL); + } + break; + default: + /* + * we're in the OPEN state (or beyond), so + * peer must have simply lost the COOKIE-ACK + */ + break; + } /* end switch */ + sctp_stop_all_cookie_timers(stcb); + /* + * We ignore the return code here.. not sure if we should + * somehow abort.. but we do have an existing asoc. This + * really should not fail. + */ + if (sctp_load_addresses_from_init(stcb, m, + init_offset + sizeof(struct sctp_init_chunk), + initack_offset, src, dst, init_src, stcb->asoc.port)) { + if (how_indx < sizeof(asoc->cookie_how)) + asoc->cookie_how[how_indx] = 4; + return (NULL); + } + /* respond with a COOKIE-ACK */ + sctp_toss_old_cookies(stcb, asoc); + sctp_send_cookie_ack(stcb); + if (how_indx < sizeof(asoc->cookie_how)) + asoc->cookie_how[how_indx] = 5; + return (stcb); + } + + if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && + ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag && + cookie->tie_tag_my_vtag == 0 && + cookie->tie_tag_peer_vtag == 0) { + /* + * case C in Section 5.2.4 Table 2: XMOO silently discard + */ + if (how_indx < sizeof(asoc->cookie_how)) + asoc->cookie_how[how_indx] = 6; + return (NULL); + } + /* If nat support, and the below and stcb is established, + * send back a ABORT(colliding state) if we are established. + */ + if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) && + (asoc->peer_supports_nat) && + ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && + ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || + (asoc->peer_vtag == 0)))) { + /* Special case - Peer's support nat. We may have + * two init's that we gave out the same tag on since + * one was not established.. i.e. we get INIT from host-1 + * behind the nat and we respond tag-a, we get a INIT from + * host-2 behind the nat and we get tag-a again. Then we + * bring up host-1 (or 2's) assoc, Then comes the cookie + * from hsot-2 (or 1). Now we have colliding state. We must + * send an abort here with colliding state indication. + */ + op_err = sctp_generate_cause(SCTP_CAUSE_NAT_COLLIDING_STATE, ""); + sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err, +#if defined(__FreeBSD__) && !defined(__Userspace__) + mflowtype, mflowid, inp->fibnum, +#endif + vrf_id, port); + return (NULL); + } + if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && + ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || + (asoc->peer_vtag == 0))) { + /* + * case B in Section 5.2.4 Table 2: MXAA or MOAA my info + * should be ok, re-accept peer info + */ + if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { + /* Extension of case C. + * If we hit this, then the random number + * generator returned the same vtag when we + * first sent our INIT-ACK and when we later sent + * our INIT. The side with the seq numbers that are + * different will be the one that normnally would + * have hit case C. This in effect "extends" our vtags + * in this collision case to be 64 bits. The same collision + * could occur aka you get both vtag and seq number the + * same twice in a row.. but is much less likely. If it + * did happen then we would proceed through and bring + * up the assoc.. we may end up with the wrong stream + * setup however.. which would be bad.. but there is + * no way to tell.. until we send on a stream that does + * not exist :-) + */ + if (how_indx < sizeof(asoc->cookie_how)) + asoc->cookie_how[how_indx] = 7; + + return (NULL); + } + if (how_indx < sizeof(asoc->cookie_how)) + asoc->cookie_how[how_indx] = 8; + sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, + SCTP_FROM_SCTP_INPUT + SCTP_LOC_15); + sctp_stop_all_cookie_timers(stcb); + /* + * since we did not send a HB make sure we don't double + * things + */ + net->hb_responded = 1; + if (stcb->asoc.sctp_autoclose_ticks && + sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { + sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, + NULL); + } + asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); + if (asoc->pre_open_streams < asoc->streamoutcnt) { + asoc->pre_open_streams = asoc->streamoutcnt; + } + + if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) { + /* Ok the peer probably discarded our + * data (if we echoed a cookie+data). So anything + * on the sent_queue should be marked for + * retransmit, we may not get something to + * kick us so it COULD still take a timeout + * to move these.. but it can't hurt to mark them. + */ + TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { + if (chk->sent < SCTP_DATAGRAM_RESEND) { + chk->sent = SCTP_DATAGRAM_RESEND; + sctp_flight_size_decrease(chk); + sctp_total_flight_decrease(stcb, chk); + sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); + spec_flag++; + } + } + + } + /* process the INIT info (peer's info) */ + retval = sctp_process_init(init_cp, stcb); + if (retval < 0) { + if (how_indx < sizeof(asoc->cookie_how)) + asoc->cookie_how[how_indx] = 9; + return (NULL); + } + if (sctp_load_addresses_from_init(stcb, m, + init_offset + sizeof(struct sctp_init_chunk), + initack_offset, src, dst, init_src, stcb->asoc.port)) { + if (how_indx < sizeof(asoc->cookie_how)) + asoc->cookie_how[how_indx] = 10; + return (NULL); + } + if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) || + (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { + *notification = SCTP_NOTIFY_ASSOC_UP; + + if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || + (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && + (!SCTP_IS_LISTENING(inp))) { +#if defined(__APPLE__) && !defined(__Userspace__) + struct socket *so; +#endif + stcb->sctp_ep->sctp_flags |= + SCTP_PCB_FLAGS_CONNECTED; +#if defined(__APPLE__) && !defined(__Userspace__) + so = SCTP_INP_SO(stcb->sctp_ep); + atomic_add_int(&stcb->asoc.refcnt, 1); + SCTP_TCB_UNLOCK(stcb); + SCTP_SOCKET_LOCK(so, 1); + SCTP_TCB_LOCK(stcb); + atomic_add_int(&stcb->asoc.refcnt, -1); + if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { + SCTP_SOCKET_UNLOCK(so, 1); + return (NULL); + } +#endif + soisconnected(stcb->sctp_socket); +#if defined(__APPLE__) && !defined(__Userspace__) + SCTP_SOCKET_UNLOCK(so, 1); +#endif + } + if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) + SCTP_STAT_INCR_COUNTER32(sctps_activeestab); + else + SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); + SCTP_STAT_INCR_GAUGE32(sctps_currestab); + } else if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) { + SCTP_STAT_INCR_COUNTER32(sctps_restartestab); + } else { + SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); + } + SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); + if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { + sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, + stcb->sctp_ep, stcb, NULL); + } + sctp_stop_all_cookie_timers(stcb); + sctp_toss_old_cookies(stcb, asoc); + sctp_send_cookie_ack(stcb); + if (spec_flag) { + /* only if we have retrans set do we do this. What + * this call does is get only the COOKIE-ACK out + * and then when we return the normal call to + * sctp_chunk_output will get the retrans out + * behind this. + */ + sctp_chunk_output(inp,stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED); + } + if (how_indx < sizeof(asoc->cookie_how)) + asoc->cookie_how[how_indx] = 11; + + return (stcb); + } + if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && + ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) && + cookie->tie_tag_my_vtag == asoc->my_vtag_nonce && + cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce && + cookie->tie_tag_peer_vtag != 0) { + struct sctpasochead *head; +#if defined(__APPLE__) && !defined(__Userspace__) + struct socket *so; +#endif + + if (asoc->peer_supports_nat) { + /* This is a gross gross hack. + * Just call the cookie_new code since we + * are allowing a duplicate association. + * I hope this works... + */ + return (sctp_process_cookie_new(m, iphlen, offset, src, dst, + sh, cookie, cookie_len, + inp, netp, init_src,notification, + auth_skipped, auth_offset, auth_len, +#if defined(__FreeBSD__) && !defined(__Userspace__) + mflowtype, mflowid, +#endif + vrf_id, port)); + } + /* + * case A in Section 5.2.4 Table 2: XXMM (peer restarted) + */ + /* temp code */ + if (how_indx < sizeof(asoc->cookie_how)) + asoc->cookie_how[how_indx] = 12; + sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, + SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); + sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, + SCTP_FROM_SCTP_INPUT + SCTP_LOC_17); + + /* notify upper layer */ + *notification = SCTP_NOTIFY_ASSOC_RESTART; + atomic_add_int(&stcb->asoc.refcnt, 1); + if ((SCTP_GET_STATE(stcb) != SCTP_STATE_OPEN) && + (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) && + (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT)) { + SCTP_STAT_INCR_GAUGE32(sctps_currestab); + } + if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) { + SCTP_STAT_INCR_GAUGE32(sctps_restartestab); + } else if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) { + SCTP_STAT_INCR_GAUGE32(sctps_collisionestab); + } + if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { + SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); + sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, + stcb->sctp_ep, stcb, NULL); + + } else if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) { + /* move to OPEN state, if not in SHUTDOWN_SENT */ + SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); + } + if (asoc->pre_open_streams < asoc->streamoutcnt) { + asoc->pre_open_streams = asoc->streamoutcnt; + } + asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); + asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; + asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; + + asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; + + asoc->str_reset_seq_in = asoc->init_seq_number; + + asoc->advanced_peer_ack_point = asoc->last_acked_seq; + if (asoc->mapping_array) { + memset(asoc->mapping_array, 0, + asoc->mapping_array_size); + } + if (asoc->nr_mapping_array) { + memset(asoc->nr_mapping_array, 0, + asoc->mapping_array_size); + } + SCTP_TCB_UNLOCK(stcb); +#if defined(__APPLE__) && !defined(__Userspace__) + so = SCTP_INP_SO(stcb->sctp_ep); + SCTP_SOCKET_LOCK(so, 1); +#endif + SCTP_INP_INFO_WLOCK(); + SCTP_INP_WLOCK(stcb->sctp_ep); + SCTP_TCB_LOCK(stcb); + atomic_add_int(&stcb->asoc.refcnt, -1); + /* send up all the data */ + SCTP_TCB_SEND_LOCK(stcb); + + sctp_report_all_outbound(stcb, 0, 1, SCTP_SO_LOCKED); + for (i = 0; i < stcb->asoc.streamoutcnt; i++) { + stcb->asoc.strmout[i].chunks_on_queues = 0; +#if defined(SCTP_DETAILED_STR_STATS) + for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) { + asoc->strmout[i].abandoned_sent[j] = 0; + asoc->strmout[i].abandoned_unsent[j] = 0; + } +#else + asoc->strmout[i].abandoned_sent[0] = 0; + asoc->strmout[i].abandoned_unsent[0] = 0; +#endif + stcb->asoc.strmout[i].sid = i; + stcb->asoc.strmout[i].next_mid_ordered = 0; + stcb->asoc.strmout[i].next_mid_unordered = 0; + stcb->asoc.strmout[i].last_msg_incomplete = 0; + } + TAILQ_FOREACH_SAFE(strrst, &asoc->resetHead, next_resp, nstrrst) { + TAILQ_REMOVE(&asoc->resetHead, strrst, next_resp); + SCTP_FREE(strrst, SCTP_M_STRESET); + } + TAILQ_FOREACH_SAFE(sq, &asoc->pending_reply_queue, next, nsq) { + TAILQ_REMOVE(&asoc->pending_reply_queue, sq, next); + if (sq->data) { + sctp_m_freem(sq->data); + sq->data = NULL; + } + sctp_free_remote_addr(sq->whoFrom); + sq->whoFrom = NULL; + sq->stcb = NULL; + sctp_free_a_readq(stcb, sq); + } + TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) { + TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next); + if (chk->data) { + sctp_m_freem(chk->data); + chk->data = NULL; + } + if (chk->holds_key_ref) + sctp_auth_key_release(stcb, chk->auth_keyid, SCTP_SO_LOCKED); + sctp_free_remote_addr(chk->whoTo); + SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_chunk), chk); + SCTP_DECR_CHK_COUNT(); + } + TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) { + TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next); + if (chk->data) { + sctp_m_freem(chk->data); + chk->data = NULL; + } + if (chk->holds_key_ref) + sctp_auth_key_release(stcb, chk->auth_keyid, SCTP_SO_LOCKED); + sctp_free_remote_addr(chk->whoTo); + SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_chunk), chk); + SCTP_DECR_CHK_COUNT(); + } + TAILQ_FOREACH_SAFE(aparam, &asoc->asconf_queue, next, naparam) { + TAILQ_REMOVE(&asoc->asconf_queue, aparam, next); + SCTP_FREE(aparam,SCTP_M_ASC_ADDR); + } + TAILQ_FOREACH_SAFE(aack, &asoc->asconf_ack_sent, next, naack) { + TAILQ_REMOVE(&asoc->asconf_ack_sent, aack, next); + if (aack->data != NULL) { + sctp_m_freem(aack->data); + } + SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_asconf_ack), aack); + } + + + /* process the INIT-ACK info (my info) */ + asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); + asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); + + /* pull from vtag hash */ + LIST_REMOVE(stcb, sctp_asocs); + /* re-insert to new vtag position */ + head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, + SCTP_BASE_INFO(hashasocmark))]; + /* + * put it in the bucket in the vtag hash of assoc's for the + * system + */ + LIST_INSERT_HEAD(head, stcb, sctp_asocs); + + SCTP_TCB_SEND_UNLOCK(stcb); + SCTP_INP_WUNLOCK(stcb->sctp_ep); + SCTP_INP_INFO_WUNLOCK(); +#if defined(__APPLE__) && !defined(__Userspace__) + SCTP_SOCKET_UNLOCK(so, 1); +#endif + asoc->total_flight = 0; + asoc->total_flight_count = 0; + /* process the INIT info (peer's info) */ + retval = sctp_process_init(init_cp, stcb); + if (retval < 0) { + if (how_indx < sizeof(asoc->cookie_how)) + asoc->cookie_how[how_indx] = 13; + + return (NULL); + } + /* + * since we did not send a HB make sure we don't double + * things + */ + net->hb_responded = 1; + + if (sctp_load_addresses_from_init(stcb, m, + init_offset + sizeof(struct sctp_init_chunk), + initack_offset, src, dst, init_src, stcb->asoc.port)) { + if (how_indx < sizeof(asoc->cookie_how)) + asoc->cookie_how[how_indx] = 14; + + return (NULL); + } + /* respond with a COOKIE-ACK */ + sctp_stop_all_cookie_timers(stcb); + sctp_toss_old_cookies(stcb, asoc); + sctp_send_cookie_ack(stcb); + if (how_indx < sizeof(asoc->cookie_how)) + asoc->cookie_how[how_indx] = 15; + + return (stcb); + } + if (how_indx < sizeof(asoc->cookie_how)) + asoc->cookie_how[how_indx] = 16; + /* all other cases... */ + return (NULL); +} + + +/* + * handle a state cookie for a new association m: input packet mbuf chain-- + * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf + * and the cookie signature does not exist offset: offset into mbuf to the + * cookie-echo chunk length: length of the cookie chunk to: where the init + * was from returns a new TCB + */ +static struct sctp_tcb * +sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, + struct sockaddr *src, struct sockaddr *dst, + struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, + struct sctp_inpcb *inp, struct sctp_nets **netp, + struct sockaddr *init_src, int *notification, + int auth_skipped, uint32_t auth_offset, uint32_t auth_len, +#if defined(__FreeBSD__) && !defined(__Userspace__) + uint8_t mflowtype, uint32_t mflowid, +#endif + uint32_t vrf_id, uint16_t port) +{ + struct sctp_tcb *stcb; + struct sctp_init_chunk *init_cp, init_buf; + struct sctp_init_ack_chunk *initack_cp, initack_buf; + union sctp_sockstore store; + struct sctp_association *asoc; + int init_offset, initack_offset, initack_limit; + int retval; + int error = 0; + uint8_t auth_chunk_buf[SCTP_CHUNK_BUFFER_SIZE]; +#if defined(__APPLE__) && !defined(__Userspace__) + struct socket *so; + + so = SCTP_INP_SO(inp); +#endif + + /* + * find and validate the INIT chunk in the cookie (peer's info) the + * INIT should start after the cookie-echo header struct (chunk + * header, state cookie header struct) + */ + init_offset = offset + sizeof(struct sctp_cookie_echo_chunk); + init_cp = (struct sctp_init_chunk *) + sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), + (uint8_t *) & init_buf); + if (init_cp == NULL) { + /* could not pull a INIT chunk in cookie */ + SCTPDBG(SCTP_DEBUG_INPUT1, + "process_cookie_new: could not pull INIT chunk hdr\n"); + return (NULL); + } + if (init_cp->ch.chunk_type != SCTP_INITIATION) { + SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n"); + return (NULL); + } + initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); + /* + * find and validate the INIT-ACK chunk in the cookie (my info) the + * INIT-ACK follows the INIT chunk + */ + initack_cp = (struct sctp_init_ack_chunk *) + sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), + (uint8_t *) & initack_buf); + if (initack_cp == NULL) { + /* could not pull INIT-ACK chunk in cookie */ + SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n"); + return (NULL); + } + if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { + return (NULL); + } + /* + * NOTE: We can't use the INIT_ACK's chk_length to determine the + * "initack_limit" value. This is because the chk_length field + * includes the length of the cookie, but the cookie is omitted when + * the INIT and INIT_ACK are tacked onto the cookie... + */ + initack_limit = offset + cookie_len; + + /* + * now that we know the INIT/INIT-ACK are in place, create a new TCB + * and popluate + */ + + /* + * Here we do a trick, we set in NULL for the proc/thread argument. We + * do this since in effect we only use the p argument when + * the socket is unbound and we must do an implicit bind. + * Since we are getting a cookie, we cannot be unbound. + */ + stcb = sctp_aloc_assoc(inp, init_src, &error, + ntohl(initack_cp->init.initiate_tag), vrf_id, + ntohs(initack_cp->init.num_outbound_streams), + port, +#if defined(__FreeBSD__) && !defined(__Userspace__) + (struct thread *)NULL, +#elif defined(_WIN32) && !defined(__Userspace__) + (PKTHREAD)NULL, +#else + (struct proc *)NULL, +#endif + SCTP_DONT_INITIALIZE_AUTH_PARAMS); + if (stcb == NULL) { + struct mbuf *op_err; + + /* memory problem? */ + SCTPDBG(SCTP_DEBUG_INPUT1, + "process_cookie_new: no room for another TCB!\n"); + op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); + sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, + src, dst, sh, op_err, +#if defined(__FreeBSD__) && !defined(__Userspace__) + mflowtype, mflowid, +#endif + vrf_id, port); + return (NULL); + } + asoc = &stcb->asoc; + /* get scope variables out of cookie */ + asoc->scope.ipv4_local_scope = cookie->ipv4_scope; + asoc->scope.site_scope = cookie->site_scope; + asoc->scope.local_scope = cookie->local_scope; + asoc->scope.loopback_scope = cookie->loopback_scope; + +#if defined(__Userspace__) + if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) || + (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal) || + (asoc->scope.conn_addr_legal != cookie->conn_addr_legal)) { +#else + if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) || + (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) { +#endif + struct mbuf *op_err; + + /* + * Houston we have a problem. The EP changed while the + * cookie was in flight. Only recourse is to abort the + * association. + */ + op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); + sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, + src, dst, sh, op_err, +#if defined(__FreeBSD__) && !defined(__Userspace__) + mflowtype, mflowid, +#endif + vrf_id, port); +#if defined(__APPLE__) && !defined(__Userspace__) + atomic_add_int(&stcb->asoc.refcnt, 1); + SCTP_TCB_UNLOCK(stcb); + SCTP_SOCKET_LOCK(so, 1); + SCTP_TCB_LOCK(stcb); + atomic_subtract_int(&stcb->asoc.refcnt, 1); +#endif + (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, + SCTP_FROM_SCTP_INPUT + SCTP_LOC_18); +#if defined(__APPLE__) && !defined(__Userspace__) + SCTP_SOCKET_UNLOCK(so, 1); +#endif + return (NULL); + } + /* process the INIT-ACK info (my info) */ + asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); + asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); + asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); + asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; + asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; + asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; + asoc->str_reset_seq_in = asoc->init_seq_number; + + asoc->advanced_peer_ack_point = asoc->last_acked_seq; + + /* process the INIT info (peer's info) */ + retval = sctp_process_init(init_cp, stcb); + if (retval < 0) { +#if defined(__APPLE__) && !defined(__Userspace__) + atomic_add_int(&stcb->asoc.refcnt, 1); + SCTP_TCB_UNLOCK(stcb); + SCTP_SOCKET_LOCK(so, 1); + SCTP_TCB_LOCK(stcb); + atomic_subtract_int(&stcb->asoc.refcnt, 1); +#endif + (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, + SCTP_FROM_SCTP_INPUT + SCTP_LOC_19); +#if defined(__APPLE__) && !defined(__Userspace__) + SCTP_SOCKET_UNLOCK(so, 1); +#endif + return (NULL); + } + /* load all addresses */ + if (sctp_load_addresses_from_init(stcb, m, + init_offset + sizeof(struct sctp_init_chunk), initack_offset, + src, dst, init_src, port)) { +#if defined(__APPLE__) && !defined(__Userspace__) + atomic_add_int(&stcb->asoc.refcnt, 1); + SCTP_TCB_UNLOCK(stcb); + SCTP_SOCKET_LOCK(so, 1); + SCTP_TCB_LOCK(stcb); + atomic_subtract_int(&stcb->asoc.refcnt, 1); +#endif + (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, + SCTP_FROM_SCTP_INPUT + SCTP_LOC_20); +#if defined(__APPLE__) && !defined(__Userspace__) + SCTP_SOCKET_UNLOCK(so, 1); +#endif + return (NULL); + } + /* + * verify any preceding AUTH chunk that was skipped + */ + /* pull the local authentication parameters from the cookie/init-ack */ + sctp_auth_get_cookie_params(stcb, m, + initack_offset + sizeof(struct sctp_init_ack_chunk), + initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk))); + if (auth_skipped) { + struct sctp_auth_chunk *auth; + + if (auth_len <= SCTP_CHUNK_BUFFER_SIZE) { + auth = (struct sctp_auth_chunk *)sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf); + } else { + auth = NULL; + } + if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) { + /* auth HMAC failed, dump the assoc and packet */ + SCTPDBG(SCTP_DEBUG_AUTH1, + "COOKIE-ECHO: AUTH failed\n"); +#if defined(__APPLE__) && !defined(__Userspace__) + atomic_add_int(&stcb->asoc.refcnt, 1); + SCTP_TCB_UNLOCK(stcb); + SCTP_SOCKET_LOCK(so, 1); + SCTP_TCB_LOCK(stcb); + atomic_subtract_int(&stcb->asoc.refcnt, 1); +#endif + (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, + SCTP_FROM_SCTP_INPUT + SCTP_LOC_21); +#if defined(__APPLE__) && !defined(__Userspace__) + SCTP_SOCKET_UNLOCK(so, 1); +#endif + return (NULL); + } else { + /* remaining chunks checked... good to go */ + stcb->asoc.authenticated = 1; + } + } + + /* + * if we're doing ASCONFs, check to see if we have any new local + * addresses that need to get added to the peer (eg. addresses + * changed while cookie echo in flight). This needs to be done + * after we go to the OPEN state to do the correct asconf + * processing. else, make sure we have the correct addresses in our + * lists + */ + + /* warning, we re-use sin, sin6, sa_store here! */ + /* pull in local_address (our "from" address) */ + switch (cookie->laddr_type) { +#ifdef INET + case SCTP_IPV4_ADDRESS: + /* source addr is IPv4 */ + memset(&store.sin, 0, sizeof(struct sockaddr_in)); + store.sin.sin_family = AF_INET; +#ifdef HAVE_SIN_LEN + store.sin.sin_len = sizeof(struct sockaddr_in); +#endif + store.sin.sin_addr.s_addr = cookie->laddress[0]; + break; +#endif +#ifdef INET6 + case SCTP_IPV6_ADDRESS: + /* source addr is IPv6 */ + memset(&store.sin6, 0, sizeof(struct sockaddr_in6)); + store.sin6.sin6_family = AF_INET6; +#ifdef HAVE_SIN6_LEN + store.sin6.sin6_len = sizeof(struct sockaddr_in6); +#endif + store.sin6.sin6_scope_id = cookie->scope_id; + memcpy(&store.sin6.sin6_addr, cookie->laddress, sizeof(struct in6_addr)); + break; +#endif +#if defined(__Userspace__) + case SCTP_CONN_ADDRESS: + /* source addr is conn */ + memset(&store.sconn, 0, sizeof(struct sockaddr_conn)); + store.sconn.sconn_family = AF_CONN; +#ifdef HAVE_SCONN_LEN + store.sconn.sconn_len = sizeof(struct sockaddr_conn); +#endif + memcpy(&store.sconn.sconn_addr, cookie->laddress, sizeof(void *)); + break; +#endif + default: +#if defined(__APPLE__) && !defined(__Userspace__) + atomic_add_int(&stcb->asoc.refcnt, 1); + SCTP_TCB_UNLOCK(stcb); + SCTP_SOCKET_LOCK(so, 1); + SCTP_TCB_LOCK(stcb); + atomic_subtract_int(&stcb->asoc.refcnt, 1); +#endif + (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, + SCTP_FROM_SCTP_INPUT + SCTP_LOC_22); +#if defined(__APPLE__) && !defined(__Userspace__) + SCTP_SOCKET_UNLOCK(so, 1); +#endif + return (NULL); + } + + /* update current state */ + SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); + SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); + if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { + sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, + stcb->sctp_ep, stcb, NULL); + } + sctp_stop_all_cookie_timers(stcb); + SCTP_STAT_INCR_COUNTER32(sctps_passiveestab); + SCTP_STAT_INCR_GAUGE32(sctps_currestab); + + /* set up to notify upper layer */ + *notification = SCTP_NOTIFY_ASSOC_UP; + if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || + (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && + (!SCTP_IS_LISTENING(inp))) { + /* + * This is an endpoint that called connect() how it got a + * cookie that is NEW is a bit of a mystery. It must be that + * the INIT was sent, but before it got there.. a complete + * INIT/INIT-ACK/COOKIE arrived. But of course then it + * should have went to the other code.. not here.. oh well.. + * a bit of protection is worth having.. + */ + stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; +#if defined(__APPLE__) && !defined(__Userspace__) + atomic_add_int(&stcb->asoc.refcnt, 1); + SCTP_TCB_UNLOCK(stcb); + SCTP_SOCKET_LOCK(so, 1); + SCTP_TCB_LOCK(stcb); + atomic_subtract_int(&stcb->asoc.refcnt, 1); + if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { + SCTP_SOCKET_UNLOCK(so, 1); + return (NULL); + } +#endif + soisconnected(stcb->sctp_socket); +#if defined(__APPLE__) && !defined(__Userspace__) + SCTP_SOCKET_UNLOCK(so, 1); +#endif + } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && + (SCTP_IS_LISTENING(inp))) { + /* + * We don't want to do anything with this one. Since it is + * the listening guy. The timer will get started for + * accepted connections in the caller. + */ + ; + } + if (stcb->asoc.sctp_autoclose_ticks && + sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { + sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL); + } + (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); + *netp = sctp_findnet(stcb, init_src); + if (*netp != NULL) { + struct timeval old; + + /* + * Since we did not send a HB, make sure we don't double + * things. + */ + (*netp)->hb_responded = 1; + /* Calculate the RTT. */ + old.tv_sec = cookie->time_entered.tv_sec; + old.tv_usec = cookie->time_entered.tv_usec; + sctp_calculate_rto(stcb, asoc, *netp, &old, SCTP_RTT_FROM_NON_DATA); + } + /* respond with a COOKIE-ACK */ + sctp_send_cookie_ack(stcb); + + /* + * check the address lists for any ASCONFs that need to be sent + * AFTER the cookie-ack is sent + */ + sctp_check_address_list(stcb, m, + initack_offset + sizeof(struct sctp_init_ack_chunk), + initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)), + &store.sa, cookie->local_scope, cookie->site_scope, + cookie->ipv4_scope, cookie->loopback_scope); + + + return (stcb); +} + +/* + * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e + * we NEED to make sure we are not already using the vtag. If so we + * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit! + head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag, + SCTP_BASE_INFO(hashasocmark))]; + LIST_FOREACH(stcb, head, sctp_asocs) { + if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep)) { + -- SEND ABORT - TRY AGAIN -- + } + } +*/ + +/* + * handles a COOKIE-ECHO message stcb: modified to either a new or left as + * existing (non-NULL) TCB + */ +static struct mbuf * +sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset, + struct sockaddr *src, struct sockaddr *dst, + struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp, + struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp, + int auth_skipped, uint32_t auth_offset, uint32_t auth_len, + struct sctp_tcb **locked_tcb, +#if defined(__FreeBSD__) && !defined(__Userspace__) + uint8_t mflowtype, uint32_t mflowid, +#endif + uint32_t vrf_id, uint16_t port) +{ + struct sctp_state_cookie *cookie; + struct sctp_tcb *l_stcb = *stcb; + struct sctp_inpcb *l_inp; + struct sockaddr *to; + struct sctp_pcb *ep; + struct mbuf *m_sig; + uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE]; + uint8_t *sig; + uint8_t cookie_ok = 0; + unsigned int sig_offset, cookie_offset; + unsigned int cookie_len; + struct timeval now; + struct timeval time_expires; + int notification = 0; + struct sctp_nets *netl; + int had_a_existing_tcb = 0; + int send_int_conf = 0; +#ifdef INET + struct sockaddr_in sin; +#endif +#ifdef INET6 + struct sockaddr_in6 sin6; +#endif +#if defined(__Userspace__) + struct sockaddr_conn sconn; +#endif + + SCTPDBG(SCTP_DEBUG_INPUT2, + "sctp_handle_cookie: handling COOKIE-ECHO\n"); + + if (inp_p == NULL) { + return (NULL); + } + cookie = &cp->cookie; + cookie_offset = offset + sizeof(struct sctp_chunkhdr); + cookie_len = ntohs(cp->ch.chunk_length); + + if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) + + sizeof(struct sctp_init_chunk) + + sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) { + /* cookie too small */ + return (NULL); + } + if ((cookie->peerport != sh->src_port) || + (cookie->myport != sh->dest_port) || + (cookie->my_vtag != sh->v_tag)) { + /* + * invalid ports or bad tag. Note that we always leave the + * v_tag in the header in network order and when we stored + * it in the my_vtag slot we also left it in network order. + * This maintains the match even though it may be in the + * opposite byte order of the machine :-> + */ + return (NULL); + } +#if defined(__Userspace__) + /* + * Recover the AF_CONN addresses within the cookie. + * This needs to be done in the buffer provided for later processing + * of the cookie and in the mbuf chain for HMAC validation. + */ + if ((cookie->addr_type == SCTP_CONN_ADDRESS) && (src->sa_family == AF_CONN)) { + struct sockaddr_conn *sconnp = (struct sockaddr_conn *)src; + + memcpy(cookie->address, &sconnp->sconn_addr , sizeof(void *)); + m_copyback(m, cookie_offset + offsetof(struct sctp_state_cookie, address), + (int)sizeof(void *), (caddr_t)&sconnp->sconn_addr); + } + if ((cookie->laddr_type == SCTP_CONN_ADDRESS) && (dst->sa_family == AF_CONN)) { + struct sockaddr_conn *sconnp = (struct sockaddr_conn *)dst; + + memcpy(cookie->laddress, &sconnp->sconn_addr , sizeof(void *)); + m_copyback(m, cookie_offset + offsetof(struct sctp_state_cookie, laddress), + (int)sizeof(void *), (caddr_t)&sconnp->sconn_addr); + } +#endif + /* + * split off the signature into its own mbuf (since it should not be + * calculated in the sctp_hmac_m() call). + */ + sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE; + m_sig = m_split(m, sig_offset, M_NOWAIT); + if (m_sig == NULL) { + /* out of memory or ?? */ + return (NULL); + } +#ifdef SCTP_MBUF_LOGGING + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { + sctp_log_mbc(m_sig, SCTP_MBUF_SPLIT); + } +#endif + + /* + * compute the signature/digest for the cookie + */ + ep = &(*inp_p)->sctp_ep; + l_inp = *inp_p; + if (l_stcb) { + SCTP_TCB_UNLOCK(l_stcb); + } + SCTP_INP_RLOCK(l_inp); + if (l_stcb) { + SCTP_TCB_LOCK(l_stcb); + } + /* which cookie is it? */ + if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) && + (ep->current_secret_number != ep->last_secret_number)) { + /* it's the old cookie */ + (void)sctp_hmac_m(SCTP_HMAC, + (uint8_t *)ep->secret_key[(int)ep->last_secret_number], + SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); + } else { + /* it's the current cookie */ + (void)sctp_hmac_m(SCTP_HMAC, + (uint8_t *)ep->secret_key[(int)ep->current_secret_number], + SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); + } + /* get the signature */ + SCTP_INP_RUNLOCK(l_inp); + sig = (uint8_t *) sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *) & tmp_sig); + if (sig == NULL) { + /* couldn't find signature */ + sctp_m_freem(m_sig); + return (NULL); + } + /* compare the received digest with the computed digest */ + if (timingsafe_bcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) { + /* try the old cookie? */ + if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) && + (ep->current_secret_number != ep->last_secret_number)) { + /* compute digest with old */ + (void)sctp_hmac_m(SCTP_HMAC, + (uint8_t *)ep->secret_key[(int)ep->last_secret_number], + SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); + /* compare */ + if (timingsafe_bcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0) + cookie_ok = 1; + } + } else { + cookie_ok = 1; + } + + /* + * Now before we continue we must reconstruct our mbuf so that + * normal processing of any other chunks will work. + */ + { + struct mbuf *m_at; + + m_at = m; + while (SCTP_BUF_NEXT(m_at) != NULL) { + m_at = SCTP_BUF_NEXT(m_at); + } + SCTP_BUF_NEXT(m_at) = m_sig; + } + + if (cookie_ok == 0) { + SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n"); + SCTPDBG(SCTP_DEBUG_INPUT2, + "offset = %u, cookie_offset = %u, sig_offset = %u\n", + (uint32_t) offset, cookie_offset, sig_offset); + return (NULL); + } + + /* + * check the cookie timestamps to be sure it's not stale + */ + (void)SCTP_GETTIME_TIMEVAL(&now); + /* Expire time is in Ticks, so we convert to seconds */ + time_expires.tv_sec = cookie->time_entered.tv_sec + sctp_ticks_to_secs(cookie->cookie_life); + time_expires.tv_usec = cookie->time_entered.tv_usec; +#if !(defined(__FreeBSD__) && !defined(__Userspace__)) + if (timercmp(&now, &time_expires, >)) +#else + if (timevalcmp(&now, &time_expires, >)) +#endif + { + /* cookie is stale! */ + struct mbuf *op_err; + struct sctp_error_stale_cookie *cause; + struct timeval diff; + uint32_t staleness; + + op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_error_stale_cookie), + 0, M_NOWAIT, 1, MT_DATA); + if (op_err == NULL) { + /* FOOBAR */ + return (NULL); + } + /* Set the len */ + SCTP_BUF_LEN(op_err) = sizeof(struct sctp_error_stale_cookie); + cause = mtod(op_err, struct sctp_error_stale_cookie *); + cause->cause.code = htons(SCTP_CAUSE_STALE_COOKIE); + cause->cause.length = htons((sizeof(struct sctp_paramhdr) + + (sizeof(uint32_t)))); +#if !(defined(__FreeBSD__) && !defined(__Userspace__)) + timersub(&now, &time_expires, &diff); +#else + diff = now; + timevalsub(&diff, &time_expires); +#endif + if ((uint32_t)diff.tv_sec > UINT32_MAX / 1000000) { + staleness = UINT32_MAX; + } else { + staleness = diff.tv_sec * 1000000; + } + if (UINT32_MAX - staleness >= (uint32_t)diff.tv_usec) { + staleness += diff.tv_usec; + } else { + staleness = UINT32_MAX; + } + cause->stale_time = htonl(staleness); + sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, +#if defined(__FreeBSD__) && !defined(__Userspace__) + mflowtype, mflowid, l_inp->fibnum, +#endif + vrf_id, port); + return (NULL); + } + /* + * Now we must see with the lookup address if we have an existing + * asoc. This will only happen if we were in the COOKIE-WAIT state + * and a INIT collided with us and somewhere the peer sent the + * cookie on another address besides the single address our assoc + * had for him. In this case we will have one of the tie-tags set at + * least AND the address field in the cookie can be used to look it + * up. + */ + to = NULL; + switch (cookie->addr_type) { +#ifdef INET6 + case SCTP_IPV6_ADDRESS: + memset(&sin6, 0, sizeof(sin6)); + sin6.sin6_family = AF_INET6; +#ifdef HAVE_SIN6_LEN + sin6.sin6_len = sizeof(sin6); +#endif + sin6.sin6_port = sh->src_port; + sin6.sin6_scope_id = cookie->scope_id; + memcpy(&sin6.sin6_addr.s6_addr, cookie->address, + sizeof(sin6.sin6_addr.s6_addr)); + to = (struct sockaddr *)&sin6; + break; +#endif +#ifdef INET + case SCTP_IPV4_ADDRESS: + memset(&sin, 0, sizeof(sin)); + sin.sin_family = AF_INET; +#ifdef HAVE_SIN_LEN + sin.sin_len = sizeof(sin); +#endif + sin.sin_port = sh->src_port; + sin.sin_addr.s_addr = cookie->address[0]; + to = (struct sockaddr *)&sin; + break; +#endif +#if defined(__Userspace__) + case SCTP_CONN_ADDRESS: + memset(&sconn, 0, sizeof(struct sockaddr_conn)); + sconn.sconn_family = AF_CONN; +#ifdef HAVE_SCONN_LEN + sconn.sconn_len = sizeof(struct sockaddr_conn); +#endif + sconn.sconn_port = sh->src_port; + memcpy(&sconn.sconn_addr, cookie->address, sizeof(void *)); + to = (struct sockaddr *)&sconn; + break; +#endif + default: + /* This should not happen */ + return (NULL); + } + if (*stcb == NULL) { + /* Yep, lets check */ + *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL); + if (*stcb == NULL) { + /* + * We should have only got back the same inp. If we + * got back a different ep we have a problem. The + * original findep got back l_inp and now + */ + if (l_inp != *inp_p) { + SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n"); + } + } else { + if (*locked_tcb == NULL) { + /* In this case we found the assoc only + * after we locked the create lock. This means + * we are in a colliding case and we must make + * sure that we unlock the tcb if its one of the + * cases where we throw away the incoming packets. + */ + *locked_tcb = *stcb; + + /* We must also increment the inp ref count + * since the ref_count flags was set when we + * did not find the TCB, now we found it which + * reduces the refcount.. we must raise it back + * out to balance it all :-) + */ + SCTP_INP_INCR_REF((*stcb)->sctp_ep); + if ((*stcb)->sctp_ep != l_inp) { + SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n", + (void *)(*stcb)->sctp_ep, (void *)l_inp); + } + } + } + } + + cookie_len -= SCTP_SIGNATURE_SIZE; + if (*stcb == NULL) { + /* this is the "normal" case... get a new TCB */ + *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh, + cookie, cookie_len, *inp_p, + netp, to, ¬ification, + auth_skipped, auth_offset, auth_len, +#if defined(__FreeBSD__) && !defined(__Userspace__) + mflowtype, mflowid, +#endif + vrf_id, port); + } else { + /* this is abnormal... cookie-echo on existing TCB */ + had_a_existing_tcb = 1; + *stcb = sctp_process_cookie_existing(m, iphlen, offset, + src, dst, sh, + cookie, cookie_len, *inp_p, *stcb, netp, to, + ¬ification, auth_skipped, auth_offset, auth_len, +#if defined(__FreeBSD__) && !defined(__Userspace__) + mflowtype, mflowid, +#endif + vrf_id, port); + } + + if (*stcb == NULL) { + /* still no TCB... must be bad cookie-echo */ + return (NULL); + } +#if defined(__FreeBSD__) && !defined(__Userspace__) + if (*netp != NULL) { + (*netp)->flowtype = mflowtype; + (*netp)->flowid = mflowid; + } +#endif + /* + * Ok, we built an association so confirm the address we sent the + * INIT-ACK to. + */ + netl = sctp_findnet(*stcb, to); + /* + * This code should in theory NOT run but + */ + if (netl == NULL) { + /* TSNH! Huh, why do I need to add this address here? */ + if (sctp_add_remote_addr(*stcb, to, NULL, port, + SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) { + return (NULL); + } + netl = sctp_findnet(*stcb, to); + } + if (netl) { + if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) { + netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED; + (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL, + netl); + send_int_conf = 1; + } + } + sctp_start_net_timers(*stcb); + if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) { + if (!had_a_existing_tcb || + (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) { + /* + * If we have a NEW cookie or the connect never + * reached the connected state during collision we + * must do the TCP accept thing. + */ + struct socket *so, *oso; + struct sctp_inpcb *inp; + + if (notification == SCTP_NOTIFY_ASSOC_RESTART) { + /* + * For a restart we will keep the same + * socket, no need to do anything. I THINK!! + */ + sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); + if (send_int_conf) { + sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, + (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); + } + return (m); + } + oso = (*inp_p)->sctp_socket; + atomic_add_int(&(*stcb)->asoc.refcnt, 1); + SCTP_TCB_UNLOCK((*stcb)); +#if defined(__FreeBSD__) && !defined(__Userspace__) + CURVNET_SET(oso->so_vnet); +#endif +#if defined(__APPLE__) && !defined(__Userspace__) + SCTP_SOCKET_LOCK(oso, 1); +#endif + so = sonewconn(oso, 0 +#if defined(__APPLE__) && !defined(__Userspace__) + ,NULL +#endif + ); +#if defined(__APPLE__) && !defined(__Userspace__) + SCTP_SOCKET_UNLOCK(oso, 1); +#endif +#if defined(__FreeBSD__) && !defined(__Userspace__) + CURVNET_RESTORE(); +#endif + SCTP_TCB_LOCK((*stcb)); + atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); + + if (so == NULL) { + struct mbuf *op_err; +#if defined(__APPLE__) && !defined(__Userspace__) + struct socket *pcb_so; +#endif + /* Too many sockets */ + SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n"); + op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); + sctp_abort_association(*inp_p, NULL, m, iphlen, + src, dst, sh, op_err, +#if defined(__FreeBSD__) && !defined(__Userspace__) + mflowtype, mflowid, +#endif + vrf_id, port); +#if defined(__APPLE__) && !defined(__Userspace__) + pcb_so = SCTP_INP_SO(*inp_p); + atomic_add_int(&(*stcb)->asoc.refcnt, 1); + SCTP_TCB_UNLOCK((*stcb)); + SCTP_SOCKET_LOCK(pcb_so, 1); + SCTP_TCB_LOCK((*stcb)); + atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); +#endif + (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, + SCTP_FROM_SCTP_INPUT + SCTP_LOC_23); +#if defined(__APPLE__) && !defined(__Userspace__) + SCTP_SOCKET_UNLOCK(pcb_so, 1); +#endif + return (NULL); + } + inp = (struct sctp_inpcb *)so->so_pcb; + SCTP_INP_INCR_REF(inp); + /* + * We add the unbound flag here so that + * if we get an soabort() before we get the + * move_pcb done, we will properly cleanup. + */ + inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE | + SCTP_PCB_FLAGS_CONNECTED | + SCTP_PCB_FLAGS_IN_TCPPOOL | + SCTP_PCB_FLAGS_UNBOUND | + (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) | + SCTP_PCB_FLAGS_DONT_WAKE); + inp->sctp_features = (*inp_p)->sctp_features; + inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features; + inp->sctp_socket = so; + inp->sctp_frag_point = (*inp_p)->sctp_frag_point; + inp->max_cwnd = (*inp_p)->max_cwnd; + inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off; + inp->ecn_supported = (*inp_p)->ecn_supported; + inp->prsctp_supported = (*inp_p)->prsctp_supported; + inp->auth_supported = (*inp_p)->auth_supported; + inp->asconf_supported = (*inp_p)->asconf_supported; + inp->reconfig_supported = (*inp_p)->reconfig_supported; + inp->nrsack_supported = (*inp_p)->nrsack_supported; + inp->pktdrop_supported = (*inp_p)->pktdrop_supported; + inp->partial_delivery_point = (*inp_p)->partial_delivery_point; + inp->sctp_context = (*inp_p)->sctp_context; + inp->local_strreset_support = (*inp_p)->local_strreset_support; + inp->fibnum = (*inp_p)->fibnum; + inp->inp_starting_point_for_iterator = NULL; +#if defined(__Userspace__) + inp->ulp_info = (*inp_p)->ulp_info; + inp->recv_callback = (*inp_p)->recv_callback; + inp->send_callback = (*inp_p)->send_callback; + inp->send_sb_threshold = (*inp_p)->send_sb_threshold; +#endif + /* + * copy in the authentication parameters from the + * original endpoint + */ + if (inp->sctp_ep.local_hmacs) + sctp_free_hmaclist(inp->sctp_ep.local_hmacs); + inp->sctp_ep.local_hmacs = + sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs); + if (inp->sctp_ep.local_auth_chunks) + sctp_free_chunklist(inp->sctp_ep.local_auth_chunks); + inp->sctp_ep.local_auth_chunks = + sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks); + + /* + * Now we must move it from one hash table to + * another and get the tcb in the right place. + */ + + /* This is where the one-2-one socket is put into + * the accept state waiting for the accept! + */ + if (*stcb) { + SCTP_ADD_SUBSTATE(*stcb, SCTP_STATE_IN_ACCEPT_QUEUE); + } + sctp_move_pcb_and_assoc(*inp_p, inp, *stcb); + + atomic_add_int(&(*stcb)->asoc.refcnt, 1); + SCTP_TCB_UNLOCK((*stcb)); + +#if defined(__FreeBSD__) && !defined(__Userspace__) + sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb, + 0); +#else + sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb, M_NOWAIT); +#endif + SCTP_TCB_LOCK((*stcb)); + atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); + + + /* now we must check to see if we were aborted while + * the move was going on and the lock/unlock happened. + */ + if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { + /* yep it was, we leave the + * assoc attached to the socket since + * the sctp_inpcb_free() call will send + * an abort for us. + */ + SCTP_INP_DECR_REF(inp); + return (NULL); + } + SCTP_INP_DECR_REF(inp); + /* Switch over to the new guy */ + *inp_p = inp; + sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); + if (send_int_conf) { + sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, + (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); + } + + /* Pull it from the incomplete queue and wake the guy */ +#if defined(__APPLE__) && !defined(__Userspace__) + atomic_add_int(&(*stcb)->asoc.refcnt, 1); + SCTP_TCB_UNLOCK((*stcb)); + SCTP_SOCKET_LOCK(so, 1); +#endif + soisconnected(so); +#if defined(__APPLE__) && !defined(__Userspace__) + SCTP_TCB_LOCK((*stcb)); + atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); + SCTP_SOCKET_UNLOCK(so, 1); +#endif + return (m); + } + } + if (notification) { + sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); + } + if (send_int_conf) { + sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, + (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); + } + return (m); +} + +static void +sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED, + struct sctp_tcb *stcb, struct sctp_nets *net) +{ + /* cp must not be used, others call this without a c-ack :-) */ + struct sctp_association *asoc; + struct sctp_tmit_chunk *chk; + + SCTPDBG(SCTP_DEBUG_INPUT2, + "sctp_handle_cookie_ack: handling COOKIE-ACK\n"); + if ((stcb == NULL) || (net == NULL)) { + return; + } + + asoc = &stcb->asoc; + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { + sctp_misc_ints(SCTP_THRESHOLD_CLEAR, + asoc->overall_error_count, + 0, + SCTP_FROM_SCTP_INPUT, + __LINE__); + } + asoc->overall_error_count = 0; + sctp_stop_all_cookie_timers(stcb); + /* process according to association state */ + if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) { + /* state change only needed when I am in right state */ + SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); + SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); + sctp_start_net_timers(stcb); + if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { + sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, + stcb->sctp_ep, stcb, NULL); + + } + /* update RTO */ + SCTP_STAT_INCR_COUNTER32(sctps_activeestab); + SCTP_STAT_INCR_GAUGE32(sctps_currestab); + if (asoc->overall_error_count == 0) { + sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, + SCTP_RTT_FROM_NON_DATA); + } + (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); + sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); + if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || + (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { +#if defined(__APPLE__) && !defined(__Userspace__) + struct socket *so; + +#endif + stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; +#if defined(__APPLE__) && !defined(__Userspace__) + so = SCTP_INP_SO(stcb->sctp_ep); + atomic_add_int(&stcb->asoc.refcnt, 1); + SCTP_TCB_UNLOCK(stcb); + SCTP_SOCKET_LOCK(so, 1); + SCTP_TCB_LOCK(stcb); + atomic_subtract_int(&stcb->asoc.refcnt, 1); +#endif + if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) { + soisconnected(stcb->sctp_socket); + } +#if defined(__APPLE__) && !defined(__Userspace__) + SCTP_SOCKET_UNLOCK(so, 1); +#endif + } + /* + * since we did not send a HB make sure we don't double + * things + */ + net->hb_responded = 1; + + if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { + /* We don't need to do the asconf thing, + * nor hb or autoclose if the socket is closed. + */ + goto closed_socket; + } + + sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, + stcb, net); + + + if (stcb->asoc.sctp_autoclose_ticks && + sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) { + sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, + stcb->sctp_ep, stcb, NULL); + } + /* + * send ASCONF if parameters are pending and ASCONFs are + * allowed (eg. addresses changed when init/cookie echo were + * in flight) + */ + if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) && + (stcb->asoc.asconf_supported == 1) && + (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) { +#ifdef SCTP_TIMER_BASED_ASCONF + sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, + stcb->sctp_ep, stcb, + stcb->asoc.primary_destination); +#else + sctp_send_asconf(stcb, stcb->asoc.primary_destination, + SCTP_ADDR_NOT_LOCKED); +#endif + } + } +closed_socket: + /* Toss the cookie if I can */ + sctp_toss_old_cookies(stcb, asoc); + /* Restart the timer if we have pending data */ + TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) { + if (chk->whoTo != NULL) { + break; + } + } + if (chk != NULL) { + sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); + } +} + +static void +sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp, + struct sctp_tcb *stcb) +{ + struct sctp_nets *net; + struct sctp_tmit_chunk *lchk; + struct sctp_ecne_chunk bkup; + uint8_t override_bit; + uint32_t tsn, window_data_tsn; + int len; + unsigned int pkt_cnt; + + len = ntohs(cp->ch.chunk_length); + if ((len != sizeof(struct sctp_ecne_chunk)) && + (len != sizeof(struct old_sctp_ecne_chunk))) { + return; + } + if (len == sizeof(struct old_sctp_ecne_chunk)) { + /* Its the old format */ + memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk)); + bkup.num_pkts_since_cwr = htonl(1); + cp = &bkup; + } + SCTP_STAT_INCR(sctps_recvecne); + tsn = ntohl(cp->tsn); + pkt_cnt = ntohl(cp->num_pkts_since_cwr); + lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead); + if (lchk == NULL) { + window_data_tsn = stcb->asoc.sending_seq - 1; + } else { + window_data_tsn = lchk->rec.data.tsn; + } + + /* Find where it was sent to if possible. */ + net = NULL; + TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) { + if (lchk->rec.data.tsn == tsn) { + net = lchk->whoTo; + net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send; + break; + } + if (SCTP_TSN_GT(lchk->rec.data.tsn, tsn)) { + break; + } + } + if (net == NULL) { + /* + * What to do. A previous send of a + * CWR was possibly lost. See how old it is, we + * may have it marked on the actual net. + */ + TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { + if (tsn == net->last_cwr_tsn) { + /* Found him, send it off */ + break; + } + } + if (net == NULL) { + /* + * If we reach here, we need to send a special + * CWR that says hey, we did this a long time + * ago and you lost the response. + */ + net = TAILQ_FIRST(&stcb->asoc.nets); + if (net == NULL) { + /* TSNH */ + return; + } + override_bit = SCTP_CWR_REDUCE_OVERRIDE; + } else { + override_bit = 0; + } + } else { + override_bit = 0; + } + if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) && + ((override_bit&SCTP_CWR_REDUCE_OVERRIDE) == 0)) { + /* JRS - Use the congestion control given in the pluggable CC module */ + stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt); + /* + * We reduce once every RTT. So we will only lower cwnd at + * the next sending seq i.e. the window_data_tsn + */ + net->cwr_window_tsn = window_data_tsn; + net->ecn_ce_pkt_cnt += pkt_cnt; + net->lost_cnt = pkt_cnt; + net->last_cwr_tsn = tsn; + } else { + override_bit |= SCTP_CWR_IN_SAME_WINDOW; + if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) && + ((override_bit&SCTP_CWR_REDUCE_OVERRIDE) == 0)) { + /* + * Another loss in the same window update how + * many marks/packets lost we have had. + */ + int cnt = 1; + if (pkt_cnt > net->lost_cnt) { + /* Should be the case */ + cnt = (pkt_cnt - net->lost_cnt); + net->ecn_ce_pkt_cnt += cnt; + } + net->lost_cnt = pkt_cnt; + net->last_cwr_tsn = tsn; + /* + * Most CC functions will ignore this call, since we are in-window + * yet of the initial CE the peer saw. + */ + stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt); + } + } + /* + * We always send a CWR this way if our previous one was lost our + * peer will get an update, or if it is not time again to reduce we + * still get the cwr to the peer. Note we set the override when we + * could not find the TSN on the chunk or the destination network. + */ + sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit); +} + +static void +sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net) +{ + /* + * Here we get a CWR from the peer. We must look in the outqueue and + * make sure that we have a covered ECNE in the control chunk part. + * If so remove it. + */ + struct sctp_tmit_chunk *chk, *nchk; + struct sctp_ecne_chunk *ecne; + int override; + uint32_t cwr_tsn; + + cwr_tsn = ntohl(cp->tsn); + override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE; + TAILQ_FOREACH_SAFE(chk, &stcb->asoc.control_send_queue, sctp_next, nchk) { + if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) { + continue; + } + if ((override == 0) && (chk->whoTo != net)) { + /* Must be from the right src unless override is set */ + continue; + } + ecne = mtod(chk->data, struct sctp_ecne_chunk *); + if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) { + /* this covers this ECNE, we can remove it */ + stcb->asoc.ecn_echo_cnt_onq--; + TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, + sctp_next); + stcb->asoc.ctrl_queue_cnt--; + sctp_m_freem(chk->data); + chk->data = NULL; + sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); + if (override == 0) { + break; + } + } + } +} + +static void +sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED, + struct sctp_tcb *stcb, struct sctp_nets *net) +{ +#if defined(__APPLE__) && !defined(__Userspace__) + struct socket *so; +#endif + + SCTPDBG(SCTP_DEBUG_INPUT2, + "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n"); + if (stcb == NULL) + return; + + /* process according to association state */ + if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) { + /* unexpected SHUTDOWN-COMPLETE... so ignore... */ + SCTPDBG(SCTP_DEBUG_INPUT2, + "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n"); + SCTP_TCB_UNLOCK(stcb); + return; + } + /* notify upper layer protocol */ + if (stcb->sctp_socket) { + sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); + } +#ifdef INVARIANTS + if (!TAILQ_EMPTY(&stcb->asoc.send_queue) || + !TAILQ_EMPTY(&stcb->asoc.sent_queue) || + sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) { + panic("Queues are not empty when handling SHUTDOWN-COMPLETE"); + } +#endif + /* stop the timer */ + sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, + SCTP_FROM_SCTP_INPUT + SCTP_LOC_24); + SCTP_STAT_INCR_COUNTER32(sctps_shutdown); + /* free the TCB */ + SCTPDBG(SCTP_DEBUG_INPUT2, + "sctp_handle_shutdown_complete: calls free-asoc\n"); +#if defined(__APPLE__) && !defined(__Userspace__) + so = SCTP_INP_SO(stcb->sctp_ep); + atomic_add_int(&stcb->asoc.refcnt, 1); + SCTP_TCB_UNLOCK(stcb); + SCTP_SOCKET_LOCK(so, 1); + SCTP_TCB_LOCK(stcb); + atomic_subtract_int(&stcb->asoc.refcnt, 1); +#endif + (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, + SCTP_FROM_SCTP_INPUT + SCTP_LOC_25); +#if defined(__APPLE__) && !defined(__Userspace__) + SCTP_SOCKET_UNLOCK(so, 1); +#endif + return; +} + +static int +process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc, + struct sctp_nets *net, uint8_t flg) +{ + switch (desc->chunk_type) { + case SCTP_DATA: + /* find the tsn to resend (possibly */ + { + uint32_t tsn; + struct sctp_tmit_chunk *tp1; + + tsn = ntohl(desc->tsn_ifany); + TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { + if (tp1->rec.data.tsn == tsn) { + /* found it */ + break; + } + if (SCTP_TSN_GT(tp1->rec.data.tsn, tsn)) { + /* not found */ + tp1 = NULL; + break; + } + } + if (tp1 == NULL) { + /* + * Do it the other way , aka without paying + * attention to queue seq order. + */ + SCTP_STAT_INCR(sctps_pdrpdnfnd); + TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { + if (tp1->rec.data.tsn == tsn) { + /* found it */ + break; + } + } + } + if (tp1 == NULL) { + SCTP_STAT_INCR(sctps_pdrptsnnf); + } + if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) { + uint8_t *ddp; + + if (((flg & SCTP_BADCRC) == 0) && + ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { + return (0); + } + if ((stcb->asoc.peers_rwnd == 0) && + ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { + SCTP_STAT_INCR(sctps_pdrpdiwnp); + return (0); + } + if (stcb->asoc.peers_rwnd == 0 && + (flg & SCTP_FROM_MIDDLE_BOX)) { + SCTP_STAT_INCR(sctps_pdrpdizrw); + return (0); + } + ddp = (uint8_t *) (mtod(tp1->data, caddr_t) + + sizeof(struct sctp_data_chunk)); + { + unsigned int iii; + + for (iii = 0; iii < sizeof(desc->data_bytes); + iii++) { + if (ddp[iii] != desc->data_bytes[iii]) { + SCTP_STAT_INCR(sctps_pdrpbadd); + return (-1); + } + } + } + + if (tp1->do_rtt) { + /* + * this guy had a RTO calculation + * pending on it, cancel it + */ + if (tp1->whoTo->rto_needed == 0) { + tp1->whoTo->rto_needed = 1; + } + tp1->do_rtt = 0; + } + SCTP_STAT_INCR(sctps_pdrpmark); + if (tp1->sent != SCTP_DATAGRAM_RESEND) + sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); + /* + * mark it as if we were doing a FR, since + * we will be getting gap ack reports behind + * the info from the router. + */ + tp1->rec.data.doing_fast_retransmit = 1; + /* + * mark the tsn with what sequences can + * cause a new FR. + */ + if (TAILQ_EMPTY(&stcb->asoc.send_queue)) { + tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq; + } else { + tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.tsn; + } + + /* restart the timer */ + sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, + stcb, tp1->whoTo, + SCTP_FROM_SCTP_INPUT + SCTP_LOC_26); + sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, + stcb, tp1->whoTo); + + /* fix counts and things */ + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { + sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP, + tp1->whoTo->flight_size, + tp1->book_size, + (uint32_t)(uintptr_t)stcb, + tp1->rec.data.tsn); + } + if (tp1->sent < SCTP_DATAGRAM_RESEND) { + sctp_flight_size_decrease(tp1); + sctp_total_flight_decrease(stcb, tp1); + } + tp1->sent = SCTP_DATAGRAM_RESEND; + } { + /* audit code */ + unsigned int audit; + + audit = 0; + TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { + if (tp1->sent == SCTP_DATAGRAM_RESEND) + audit++; + } + TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue, + sctp_next) { + if (tp1->sent == SCTP_DATAGRAM_RESEND) + audit++; + } + if (audit != stcb->asoc.sent_queue_retran_cnt) { + SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n", + audit, stcb->asoc.sent_queue_retran_cnt); +#ifndef SCTP_AUDITING_ENABLED + stcb->asoc.sent_queue_retran_cnt = audit; +#endif + } + } + } + break; + case SCTP_ASCONF: + { + struct sctp_tmit_chunk *asconf; + + TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue, + sctp_next) { + if (asconf->rec.chunk_id.id == SCTP_ASCONF) { + break; + } + } + if (asconf) { + if (asconf->sent != SCTP_DATAGRAM_RESEND) + sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); + asconf->sent = SCTP_DATAGRAM_RESEND; + asconf->snd_count--; + } + } + break; + case SCTP_INITIATION: + /* resend the INIT */ + stcb->asoc.dropped_special_cnt++; + if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) { + /* + * If we can get it in, in a few attempts we do + * this, otherwise we let the timer fire. + */ + sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, + stcb, net, + SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); + sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); + } + break; + case SCTP_SELECTIVE_ACK: + case SCTP_NR_SELECTIVE_ACK: + /* resend the sack */ + sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED); + break; + case SCTP_HEARTBEAT_REQUEST: + /* resend a demand HB */ + if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) { + /* Only retransmit if we KNOW we wont destroy the tcb */ + sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); + } + break; + case SCTP_SHUTDOWN: + sctp_send_shutdown(stcb, net); + break; + case SCTP_SHUTDOWN_ACK: + sctp_send_shutdown_ack(stcb, net); + break; + case SCTP_COOKIE_ECHO: + { + struct sctp_tmit_chunk *cookie; + + cookie = NULL; + TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, + sctp_next) { + if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) { + break; + } + } + if (cookie) { + if (cookie->sent != SCTP_DATAGRAM_RESEND) + sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); + cookie->sent = SCTP_DATAGRAM_RESEND; + sctp_stop_all_cookie_timers(stcb); + } + } + break; + case SCTP_COOKIE_ACK: + sctp_send_cookie_ack(stcb); + break; + case SCTP_ASCONF_ACK: + /* resend last asconf ack */ + sctp_send_asconf_ack(stcb); + break; + case SCTP_IFORWARD_CUM_TSN: + case SCTP_FORWARD_CUM_TSN: + send_forward_tsn(stcb, &stcb->asoc); + break; + /* can't do anything with these */ + case SCTP_PACKET_DROPPED: + case SCTP_INITIATION_ACK: /* this should not happen */ + case SCTP_HEARTBEAT_ACK: + case SCTP_ABORT_ASSOCIATION: + case SCTP_OPERATION_ERROR: + case SCTP_SHUTDOWN_COMPLETE: + case SCTP_ECN_ECHO: + case SCTP_ECN_CWR: + default: + break; + } + return (0); +} + +void +sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list) +{ + uint32_t i; + uint16_t temp; + + /* + * We set things to 0xffffffff since this is the last delivered sequence + * and we will be sending in 0 after the reset. + */ + + if (number_entries) { + for (i = 0; i < number_entries; i++) { + temp = ntohs(list[i]); + if (temp >= stcb->asoc.streamincnt) { + continue; + } + stcb->asoc.strmin[temp].last_mid_delivered = 0xffffffff; + } + } else { + list = NULL; + for (i = 0; i < stcb->asoc.streamincnt; i++) { + stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff; + } + } + sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); +} + +static void +sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list) +{ + uint32_t i; + uint16_t temp; + + if (number_entries > 0) { + for (i = 0; i < number_entries; i++) { + temp = ntohs(list[i]); + if (temp >= stcb->asoc.streamoutcnt) { + /* no such stream */ + continue; + } + stcb->asoc.strmout[temp].next_mid_ordered = 0; + stcb->asoc.strmout[temp].next_mid_unordered = 0; + } + } else { + for (i = 0; i < stcb->asoc.streamoutcnt; i++) { + stcb->asoc.strmout[i].next_mid_ordered = 0; + stcb->asoc.strmout[i].next_mid_unordered = 0; + } + } + sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); +} + +static void +sctp_reset_clear_pending(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list) +{ + uint32_t i; + uint16_t temp; + + if (number_entries > 0) { + for (i = 0; i < number_entries; i++) { + temp = ntohs(list[i]); + if (temp >= stcb->asoc.streamoutcnt) { + /* no such stream */ + continue; + } + stcb->asoc.strmout[temp].state = SCTP_STREAM_OPEN; + } + } else { + for (i = 0; i < stcb->asoc.streamoutcnt; i++) { + stcb->asoc.strmout[i].state = SCTP_STREAM_OPEN; + } + } +} + + +struct sctp_stream_reset_request * +sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk) +{ + struct sctp_association *asoc; + struct sctp_chunkhdr *ch; + struct sctp_stream_reset_request *r; + struct sctp_tmit_chunk *chk; + int len, clen; + + asoc = &stcb->asoc; + if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { + asoc->stream_reset_outstanding = 0; + return (NULL); + } + if (stcb->asoc.str_reset == NULL) { + asoc->stream_reset_outstanding = 0; + return (NULL); + } + chk = stcb->asoc.str_reset; + if (chk->data == NULL) { + return (NULL); + } + if (bchk) { + /* he wants a copy of the chk pointer */ + *bchk = chk; + } + clen = chk->send_size; + ch = mtod(chk->data, struct sctp_chunkhdr *); + r = (struct sctp_stream_reset_request *)(ch + 1); + if (ntohl(r->request_seq) == seq) { + /* found it */ + return (r); + } + len = SCTP_SIZE32(ntohs(r->ph.param_length)); + if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) { + /* move to the next one, there can only be a max of two */ + r = (struct sctp_stream_reset_request *)((caddr_t)r + len); + if (ntohl(r->request_seq) == seq) { + return (r); + } + } + /* that seq is not here */ + return (NULL); +} + +static void +sctp_clean_up_stream_reset(struct sctp_tcb *stcb) +{ + struct sctp_association *asoc; + struct sctp_tmit_chunk *chk; + + asoc = &stcb->asoc; + chk = asoc->str_reset; + if (chk == NULL) { + return; + } + asoc->str_reset = NULL; + sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, + NULL, SCTP_FROM_SCTP_INPUT + SCTP_LOC_28); + TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next); + asoc->ctrl_queue_cnt--; + if (chk->data) { + sctp_m_freem(chk->data); + chk->data = NULL; + } + sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); +} + + +static int +sctp_handle_stream_reset_response(struct sctp_tcb *stcb, + uint32_t seq, uint32_t action, + struct sctp_stream_reset_response *respin) +{ + uint16_t type; + int lparam_len; + struct sctp_association *asoc = &stcb->asoc; + struct sctp_tmit_chunk *chk; + struct sctp_stream_reset_request *req_param; + struct sctp_stream_reset_out_request *req_out_param; + struct sctp_stream_reset_in_request *req_in_param; + uint32_t number_entries; + + if (asoc->stream_reset_outstanding == 0) { + /* duplicate */ + return (0); + } + if (seq == stcb->asoc.str_reset_seq_out) { + req_param = sctp_find_stream_reset(stcb, seq, &chk); + if (req_param != NULL) { + stcb->asoc.str_reset_seq_out++; + type = ntohs(req_param->ph.param_type); + lparam_len = ntohs(req_param->ph.param_length); + if (type == SCTP_STR_RESET_OUT_REQUEST) { + int no_clear = 0; + + req_out_param = (struct sctp_stream_reset_out_request *)req_param; + number_entries = (lparam_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t); + asoc->stream_reset_out_is_outstanding = 0; + if (asoc->stream_reset_outstanding) + asoc->stream_reset_outstanding--; + if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { + /* do it */ + sctp_reset_out_streams(stcb, number_entries, req_out_param->list_of_streams); + } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { + sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED); + } else if (action == SCTP_STREAM_RESET_RESULT_IN_PROGRESS) { + /* Set it up so we don't stop retransmitting */ + asoc->stream_reset_outstanding++; + stcb->asoc.str_reset_seq_out--; + asoc->stream_reset_out_is_outstanding = 1; + no_clear = 1; + } else { + sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED); + } + if (no_clear == 0) { + sctp_reset_clear_pending(stcb, number_entries, req_out_param->list_of_streams); + } + } else if (type == SCTP_STR_RESET_IN_REQUEST) { + req_in_param = (struct sctp_stream_reset_in_request *)req_param; + number_entries = (lparam_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t); + if (asoc->stream_reset_outstanding) + asoc->stream_reset_outstanding--; + if (action == SCTP_STREAM_RESET_RESULT_DENIED) { + sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb, + number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED); + } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { + sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb, + number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED); + } + } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) { + /* Ok we now may have more streams */ + int num_stream; + + num_stream = stcb->asoc.strm_pending_add_size; + if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) { + /* TSNH */ + num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt; + } + stcb->asoc.strm_pending_add_size = 0; + if (asoc->stream_reset_outstanding) + asoc->stream_reset_outstanding--; + if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { + /* Put the new streams into effect */ + int i; + for ( i = asoc->streamoutcnt; i< (asoc->streamoutcnt + num_stream); i++) { + asoc->strmout[i].state = SCTP_STREAM_OPEN; + } + asoc->streamoutcnt += num_stream; + sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); + } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { + sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, + SCTP_STREAM_CHANGE_DENIED); + } else { + sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, + SCTP_STREAM_CHANGE_FAILED); + } + } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) { + if (asoc->stream_reset_outstanding) + asoc->stream_reset_outstanding--; + if (action == SCTP_STREAM_RESET_RESULT_DENIED) { + sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, + SCTP_STREAM_CHANGE_DENIED); + } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { + sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, + SCTP_STREAM_CHANGE_FAILED); + } + } else if (type == SCTP_STR_RESET_TSN_REQUEST) { + /** + * a) Adopt the new in tsn. + * b) reset the map + * c) Adopt the new out-tsn + */ + struct sctp_stream_reset_response_tsn *resp; + struct sctp_forward_tsn_chunk fwdtsn; + int abort_flag = 0; + if (respin == NULL) { + /* huh ? */ + return (0); + } + if (ntohs(respin->ph.param_length) < sizeof(struct sctp_stream_reset_response_tsn)) { + return (0); + } + if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { + resp = (struct sctp_stream_reset_response_tsn *)respin; + asoc->stream_reset_outstanding--; + fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); + fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; + fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1); + sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); + if (abort_flag) { + return (1); + } + stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1); + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { + sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); + } + + stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; + stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn); + memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); + + stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map; + memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size); + + stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn); + stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn; + + sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL); + sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL); + sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0); + } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { + sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), + SCTP_ASSOC_RESET_DENIED); + } else { + sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), + SCTP_ASSOC_RESET_FAILED); + } + } + /* get rid of the request and get the request flags */ + if (asoc->stream_reset_outstanding == 0) { + sctp_clean_up_stream_reset(stcb); + } + } + } + if (asoc->stream_reset_outstanding == 0) { + sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED); + } + return (0); +} + +static void +sctp_handle_str_reset_request_in(struct sctp_tcb *stcb, + struct sctp_tmit_chunk *chk, + struct sctp_stream_reset_in_request *req, int trunc) +{ + uint32_t seq; + int len, i; + int number_entries; + uint16_t temp; + + /* + * peer wants me to send a str-reset to him for my outgoing seq's if + * seq_in is right. + */ + struct sctp_association *asoc = &stcb->asoc; + + seq = ntohl(req->request_seq); + if (asoc->str_reset_seq_in == seq) { + asoc->last_reset_action[1] = asoc->last_reset_action[0]; + if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { + asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; + } else if (trunc) { + /* Can't do it, since they exceeded our buffer size */ + asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; + } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) { + len = ntohs(req->ph.param_length); + number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t)); + if (number_entries) { + for (i = 0; i < number_entries; i++) { + temp = ntohs(req->list_of_streams[i]); + if (temp >= stcb->asoc.streamoutcnt) { + asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; + goto bad_boy; + } + req->list_of_streams[i] = temp; + } + for (i = 0; i < number_entries; i++) { + if (stcb->asoc.strmout[req->list_of_streams[i]].state == SCTP_STREAM_OPEN) { + stcb->asoc.strmout[req->list_of_streams[i]].state = SCTP_STREAM_RESET_PENDING; + } + } + } else { + /* Its all */ + for (i = 0; i < stcb->asoc.streamoutcnt; i++) { + if (stcb->asoc.strmout[i].state == SCTP_STREAM_OPEN) + stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_PENDING; + } + } + asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; + } else { + /* Can't do it, since we have sent one out */ + asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; + } + bad_boy: + sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); + asoc->str_reset_seq_in++; + } else if (asoc->str_reset_seq_in - 1 == seq) { + sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); + } else if (asoc->str_reset_seq_in - 2 == seq) { + sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); + } else { + sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); + } + sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED); +} + +static int +sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb, + struct sctp_tmit_chunk *chk, + struct sctp_stream_reset_tsn_request *req) +{ + /* reset all in and out and update the tsn */ + /* + * A) reset my str-seq's on in and out. B) Select a receive next, + * and set cum-ack to it. Also process this selected number as a + * fwd-tsn as well. C) set in the response my next sending seq. + */ + struct sctp_forward_tsn_chunk fwdtsn; + struct sctp_association *asoc = &stcb->asoc; + int abort_flag = 0; + uint32_t seq; + + seq = ntohl(req->request_seq); + if (asoc->str_reset_seq_in == seq) { + asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0]; + if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { + asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; + } else { + fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); + fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; + fwdtsn.ch.chunk_flags = 0; + fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1); + sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); + if (abort_flag) { + return (1); + } + asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA; + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { + sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); + } + asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map; + asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1; + memset(asoc->mapping_array, 0, asoc->mapping_array_size); + asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; + memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size); + atomic_add_int(&asoc->sending_seq, 1); + /* save off historical data for retrans */ + asoc->last_sending_seq[1] = asoc->last_sending_seq[0]; + asoc->last_sending_seq[0] = asoc->sending_seq; + asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0]; + asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn; + sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL); + sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL); + asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; + sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0); + } + sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], + asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); + asoc->str_reset_seq_in++; + } else if (asoc->str_reset_seq_in - 1 == seq) { + sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], + asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); + } else if (asoc->str_reset_seq_in - 2 == seq) { + sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1], + asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]); + } else { + sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); + } + return (0); +} + +static void +sctp_handle_str_reset_request_out(struct sctp_tcb *stcb, + struct sctp_tmit_chunk *chk, + struct sctp_stream_reset_out_request *req, int trunc) +{ + uint32_t seq, tsn; + int number_entries, len; + struct sctp_association *asoc = &stcb->asoc; + + seq = ntohl(req->request_seq); + + /* now if its not a duplicate we process it */ + if (asoc->str_reset_seq_in == seq) { + len = ntohs(req->ph.param_length); + number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t)); + /* + * the sender is resetting, handle the list issue.. we must + * a) verify if we can do the reset, if so no problem b) If + * we can't do the reset we must copy the request. c) queue + * it, and setup the data in processor to trigger it off + * when needed and dequeue all the queued data. + */ + tsn = ntohl(req->send_reset_at_tsn); + + /* move the reset action back one */ + asoc->last_reset_action[1] = asoc->last_reset_action[0]; + if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { + asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; + } else if (trunc) { + asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; + } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) { + /* we can do it now */ + sctp_reset_in_stream(stcb, number_entries, req->list_of_streams); + asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; + } else { + /* + * we must queue it up and thus wait for the TSN's + * to arrive that are at or before tsn + */ + struct sctp_stream_reset_list *liste; + int siz; + + siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t)); + SCTP_MALLOC(liste, struct sctp_stream_reset_list *, + siz, SCTP_M_STRESET); + if (liste == NULL) { + /* gak out of memory */ + asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; + sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); + return; + } + liste->seq = seq; + liste->tsn = tsn; + liste->number_entries = number_entries; + memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t)); + TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp); + asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_IN_PROGRESS; + } + sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); + asoc->str_reset_seq_in++; + } else if ((asoc->str_reset_seq_in - 1) == seq) { + /* + * one seq back, just echo back last action since my + * response was lost. + */ + sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); + } else if ((asoc->str_reset_seq_in - 2) == seq) { + /* + * two seq back, just echo back last action since my + * response was lost. + */ + sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); + } else { + sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); + } +} + +static void +sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, + struct sctp_stream_reset_add_strm *str_add) +{ + /* + * Peer is requesting to add more streams. + * If its within our max-streams we will + * allow it. + */ + uint32_t num_stream, i; + uint32_t seq; + struct sctp_association *asoc = &stcb->asoc; + struct sctp_queued_to_read *ctl, *nctl; + + /* Get the number. */ + seq = ntohl(str_add->request_seq); + num_stream = ntohs(str_add->number_of_streams); + /* Now what would be the new total? */ + if (asoc->str_reset_seq_in == seq) { + num_stream += stcb->asoc.streamincnt; + stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; + if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { + asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; + } else if ((num_stream > stcb->asoc.max_inbound_streams) || + (num_stream > 0xffff)) { + /* We must reject it they ask for to many */ + denied: + stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; + } else { + /* Ok, we can do that :-) */ + struct sctp_stream_in *oldstrm; + + /* save off the old */ + oldstrm = stcb->asoc.strmin; + SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *, + (num_stream * sizeof(struct sctp_stream_in)), + SCTP_M_STRMI); + if (stcb->asoc.strmin == NULL) { + stcb->asoc.strmin = oldstrm; + goto denied; + } + /* copy off the old data */ + for (i = 0; i < stcb->asoc.streamincnt; i++) { + TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); + TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue); + stcb->asoc.strmin[i].sid = i; + stcb->asoc.strmin[i].last_mid_delivered = oldstrm[i].last_mid_delivered; + stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started; + stcb->asoc.strmin[i].pd_api_started = oldstrm[i].pd_api_started; + /* now anything on those queues? */ + TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next_instrm, nctl) { + TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next_instrm); + TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next_instrm); + } + TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].uno_inqueue, next_instrm, nctl) { + TAILQ_REMOVE(&oldstrm[i].uno_inqueue, ctl, next_instrm); + TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].uno_inqueue, ctl, next_instrm); + } + } + /* Init the new streams */ + for (i = stcb->asoc.streamincnt; i < num_stream; i++) { + TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); + TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue); + stcb->asoc.strmin[i].sid = i; + stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff; + stcb->asoc.strmin[i].pd_api_started = 0; + stcb->asoc.strmin[i].delivery_started = 0; + } + SCTP_FREE(oldstrm, SCTP_M_STRMI); + /* update the size */ + stcb->asoc.streamincnt = num_stream; + stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; + sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); + } + sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); + asoc->str_reset_seq_in++; + } else if ((asoc->str_reset_seq_in - 1) == seq) { + /* + * one seq back, just echo back last action since my + * response was lost. + */ + sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); + } else if ((asoc->str_reset_seq_in - 2) == seq) { + /* + * two seq back, just echo back last action since my + * response was lost. + */ + sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); + } else { + sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); + + } +} + +static void +sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, + struct sctp_stream_reset_add_strm *str_add) +{ + /* + * Peer is requesting to add more streams. + * If its within our max-streams we will + * allow it. + */ + uint16_t num_stream; + uint32_t seq; + struct sctp_association *asoc = &stcb->asoc; + + /* Get the number. */ + seq = ntohl(str_add->request_seq); + num_stream = ntohs(str_add->number_of_streams); + /* Now what would be the new total? */ + if (asoc->str_reset_seq_in == seq) { + stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; + if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { + asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; + } else if (stcb->asoc.stream_reset_outstanding) { + /* We must reject it we have something pending */ + stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; + } else { + /* Ok, we can do that :-) */ + int mychk; + mychk = stcb->asoc.streamoutcnt; + mychk += num_stream; + if (mychk < 0x10000) { + stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; + if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 1, num_stream, 0, 1)) { + stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; + } + } else { + stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; + } + } + sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]); + asoc->str_reset_seq_in++; + } else if ((asoc->str_reset_seq_in - 1) == seq) { + /* + * one seq back, just echo back last action since my + * response was lost. + */ + sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); + } else if ((asoc->str_reset_seq_in - 2) == seq) { + /* + * two seq back, just echo back last action since my + * response was lost. + */ + sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); + } else { + sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); + } +} + +#ifdef __GNUC__ +__attribute__ ((noinline)) +#endif +static int +sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset, + struct sctp_chunkhdr *ch_req) +{ + uint16_t remaining_length, param_len, ptype; + struct sctp_paramhdr pstore; + uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE]; + uint32_t seq = 0; + int num_req = 0; + int trunc = 0; + struct sctp_tmit_chunk *chk; + struct sctp_chunkhdr *ch; + struct sctp_paramhdr *ph; + int ret_code = 0; + int num_param = 0; + + /* now it may be a reset or a reset-response */ + remaining_length = ntohs(ch_req->chunk_length) - sizeof(struct sctp_chunkhdr); + + /* setup for adding the response */ + sctp_alloc_a_chunk(stcb, chk); + if (chk == NULL) { + return (ret_code); + } + chk->copy_by_ref = 0; + chk->rec.chunk_id.id = SCTP_STREAM_RESET; + chk->rec.chunk_id.can_take_data = 0; + chk->flags = 0; + chk->asoc = &stcb->asoc; + chk->no_fr_allowed = 0; + chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr); + chk->book_size_scale = 0; + chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA); + if (chk->data == NULL) { + strres_nochunk: + if (chk->data) { + sctp_m_freem(chk->data); + chk->data = NULL; + } + sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); + return (ret_code); + } + SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD); + + /* setup chunk parameters */ + chk->sent = SCTP_DATAGRAM_UNSENT; + chk->snd_count = 0; + chk->whoTo = NULL; + + ch = mtod(chk->data, struct sctp_chunkhdr *); + ch->chunk_type = SCTP_STREAM_RESET; + ch->chunk_flags = 0; + ch->chunk_length = htons(chk->send_size); + SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size); + offset += sizeof(struct sctp_chunkhdr); + while (remaining_length >= sizeof(struct sctp_paramhdr)) { + ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *)&pstore); + if (ph == NULL) { + /* TSNH */ + break; + } + param_len = ntohs(ph->param_length); + if ((param_len > remaining_length) || + (param_len < (sizeof(struct sctp_paramhdr) + sizeof(uint32_t)))) { + /* bad parameter length */ + break; + } + ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, sizeof(cstore)), + (uint8_t *)&cstore); + if (ph == NULL) { + /* TSNH */ + break; + } + ptype = ntohs(ph->param_type); + num_param++; + if (param_len > sizeof(cstore)) { + trunc = 1; + } else { + trunc = 0; + } + if (num_param > SCTP_MAX_RESET_PARAMS) { + /* hit the max of parameters already sorry.. */ + break; + } + if (ptype == SCTP_STR_RESET_OUT_REQUEST) { + struct sctp_stream_reset_out_request *req_out; + + if (param_len < sizeof(struct sctp_stream_reset_out_request)) { + break; + } + req_out = (struct sctp_stream_reset_out_request *)ph; + num_req++; + if (stcb->asoc.stream_reset_outstanding) { + seq = ntohl(req_out->response_seq); + if (seq == stcb->asoc.str_reset_seq_out) { + /* implicit ack */ + (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL); + } + } + sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc); + } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) { + struct sctp_stream_reset_add_strm *str_add; + + if (param_len < sizeof(struct sctp_stream_reset_add_strm)) { + break; + } + str_add = (struct sctp_stream_reset_add_strm *)ph; + num_req++; + sctp_handle_str_reset_add_strm(stcb, chk, str_add); + } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) { + struct sctp_stream_reset_add_strm *str_add; + + if (param_len < sizeof(struct sctp_stream_reset_add_strm)) { + break; + } + str_add = (struct sctp_stream_reset_add_strm *)ph; + num_req++; + sctp_handle_str_reset_add_out_strm(stcb, chk, str_add); + } else if (ptype == SCTP_STR_RESET_IN_REQUEST) { + struct sctp_stream_reset_in_request *req_in; + + num_req++; + req_in = (struct sctp_stream_reset_in_request *)ph; + sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc); + } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) { + struct sctp_stream_reset_tsn_request *req_tsn; + + num_req++; + req_tsn = (struct sctp_stream_reset_tsn_request *)ph; + if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) { + ret_code = 1; + goto strres_nochunk; + } + /* no more */ + break; + } else if (ptype == SCTP_STR_RESET_RESPONSE) { + struct sctp_stream_reset_response *resp; + uint32_t result; + + if (param_len < sizeof(struct sctp_stream_reset_response)) { + break; + } + resp = (struct sctp_stream_reset_response *)ph; + seq = ntohl(resp->response_seq); + result = ntohl(resp->result); + if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) { + ret_code = 1; + goto strres_nochunk; + } + } else { + break; + } + offset += SCTP_SIZE32(param_len); + if (remaining_length >= SCTP_SIZE32(param_len)) { + remaining_length -= SCTP_SIZE32(param_len); + } else { + remaining_length = 0; + } + } + if (num_req == 0) { + /* we have no response free the stuff */ + goto strres_nochunk; + } + /* ok we have a chunk to link in */ + TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, + chk, + sctp_next); + stcb->asoc.ctrl_queue_cnt++; + return (ret_code); +} + +/* + * Handle a router or endpoints report of a packet loss, there are two ways + * to handle this, either we get the whole packet and must disect it + * ourselves (possibly with truncation and or corruption) or it is a summary + * from a middle box that did the disectting for us. + */ +static void +sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp, + struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) +{ + uint32_t bottle_bw, on_queue; + uint16_t trunc_len; + unsigned int chlen; + unsigned int at; + struct sctp_chunk_desc desc; + struct sctp_chunkhdr *ch; + + chlen = ntohs(cp->ch.chunk_length); + chlen -= sizeof(struct sctp_pktdrop_chunk); + /* XXX possible chlen underflow */ + if (chlen == 0) { + ch = NULL; + if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) + SCTP_STAT_INCR(sctps_pdrpbwrpt); + } else { + ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr)); + chlen -= sizeof(struct sctphdr); + /* XXX possible chlen underflow */ + memset(&desc, 0, sizeof(desc)); + } + trunc_len = (uint16_t) ntohs(cp->trunc_len); + if (trunc_len > limit) { + trunc_len = limit; + } + + /* now the chunks themselves */ + while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) { + desc.chunk_type = ch->chunk_type; + /* get amount we need to move */ + at = ntohs(ch->chunk_length); + if (at < sizeof(struct sctp_chunkhdr)) { + /* corrupt chunk, maybe at the end? */ + SCTP_STAT_INCR(sctps_pdrpcrupt); + break; + } + if (trunc_len == 0) { + /* we are supposed to have all of it */ + if (at > chlen) { + /* corrupt skip it */ + SCTP_STAT_INCR(sctps_pdrpcrupt); + break; + } + } else { + /* is there enough of it left ? */ + if (desc.chunk_type == SCTP_DATA) { + if (chlen < (sizeof(struct sctp_data_chunk) + + sizeof(desc.data_bytes))) { + break; + } + } else { + if (chlen < sizeof(struct sctp_chunkhdr)) { + break; + } + } + } + if (desc.chunk_type == SCTP_DATA) { + /* can we get out the tsn? */ + if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) + SCTP_STAT_INCR(sctps_pdrpmbda); + + if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) { + /* yep */ + struct sctp_data_chunk *dcp; + uint8_t *ddp; + unsigned int iii; + + dcp = (struct sctp_data_chunk *)ch; + ddp = (uint8_t *) (dcp + 1); + for (iii = 0; iii < sizeof(desc.data_bytes); iii++) { + desc.data_bytes[iii] = ddp[iii]; + } + desc.tsn_ifany = dcp->dp.tsn; + } else { + /* nope we are done. */ + SCTP_STAT_INCR(sctps_pdrpnedat); + break; + } + } else { + if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) + SCTP_STAT_INCR(sctps_pdrpmbct); + } + + if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) { + SCTP_STAT_INCR(sctps_pdrppdbrk); + break; + } + if (SCTP_SIZE32(at) > chlen) { + break; + } + chlen -= SCTP_SIZE32(at); + if (chlen < sizeof(struct sctp_chunkhdr)) { + /* done, none left */ + break; + } + ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at)); + } + /* Now update any rwnd --- possibly */ + if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) { + /* From a peer, we get a rwnd report */ + uint32_t a_rwnd; + + SCTP_STAT_INCR(sctps_pdrpfehos); + + bottle_bw = ntohl(cp->bottle_bw); + on_queue = ntohl(cp->current_onq); + if (bottle_bw && on_queue) { + /* a rwnd report is in here */ + if (bottle_bw > on_queue) + a_rwnd = bottle_bw - on_queue; + else + a_rwnd = 0; + + if (a_rwnd == 0) + stcb->asoc.peers_rwnd = 0; + else { + if (a_rwnd > stcb->asoc.total_flight) { + stcb->asoc.peers_rwnd = + a_rwnd - stcb->asoc.total_flight; + } else { + stcb->asoc.peers_rwnd = 0; + } + if (stcb->asoc.peers_rwnd < + stcb->sctp_ep->sctp_ep.sctp_sws_sender) { + /* SWS sender side engages */ + stcb->asoc.peers_rwnd = 0; + } + } + } + } else { + SCTP_STAT_INCR(sctps_pdrpfmbox); + } + + /* now middle boxes in sat networks get a cwnd bump */ + if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) && + (stcb->asoc.sat_t3_loss_recovery == 0) && + (stcb->asoc.sat_network)) { + /* + * This is debatable but for sat networks it makes sense + * Note if a T3 timer has went off, we will prohibit any + * changes to cwnd until we exit the t3 loss recovery. + */ + stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb, + net, cp, &bottle_bw, &on_queue); + } +} + +/* + * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to + * still contain IP/SCTP header - stcb: is the tcb found for this packet - + * offset: offset into the mbuf chain to first chunkhdr - length: is the + * length of the complete packet outputs: - length: modified to remaining + * length after control processing - netp: modified to new sctp_nets after + * cookie-echo processing - return NULL to discard the packet (ie. no asoc, + * bad packet,...) otherwise return the tcb for this packet + */ +#ifdef __GNUC__ +__attribute__ ((noinline)) +#endif +static struct sctp_tcb * +sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length, + struct sockaddr *src, struct sockaddr *dst, + struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp, + struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen, +#if defined(__FreeBSD__) && !defined(__Userspace__) + uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum, +#endif + uint32_t vrf_id, uint16_t port) +{ + struct sctp_association *asoc; + struct mbuf *op_err; + char msg[SCTP_DIAG_INFO_LEN]; + uint32_t vtag_in; + int num_chunks = 0; /* number of control chunks processed */ + uint32_t chk_length, contiguous; + int ret; + int abort_no_unlock = 0; + int ecne_seen = 0; + /* + * How big should this be, and should it be alloc'd? Lets try the + * d-mtu-ceiling for now (2k) and that should hopefully work ... + * until we get into jumbo grams and such.. + */ + uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE]; + int got_auth = 0; + uint32_t auth_offset = 0, auth_len = 0; + int auth_skipped = 0; + int asconf_cnt = 0; +#if defined(__APPLE__) && !defined(__Userspace__) + struct socket *so; +#endif + + SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n", + iphlen, *offset, length, (void *)stcb); + + if (stcb) { + SCTP_TCB_LOCK_ASSERT(stcb); + } + /* validate chunk header length... */ + if (ntohs(ch->chunk_length) < sizeof(*ch)) { + SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n", + ntohs(ch->chunk_length)); + *offset = length; + return (stcb); + } + /* + * validate the verification tag + */ + vtag_in = ntohl(sh->v_tag); + + if (ch->chunk_type == SCTP_INITIATION) { + SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n", + ntohs(ch->chunk_length), vtag_in); + if (vtag_in != 0) { + /* protocol error- silently discard... */ + SCTP_STAT_INCR(sctps_badvtag); + if (stcb != NULL) { + SCTP_TCB_UNLOCK(stcb); + } + return (NULL); + } + } else if (ch->chunk_type != SCTP_COOKIE_ECHO) { + /* + * If there is no stcb, skip the AUTH chunk and process + * later after a stcb is found (to validate the lookup was + * valid. + */ + if ((ch->chunk_type == SCTP_AUTHENTICATION) && + (stcb == NULL) && + (inp->auth_supported == 1)) { + /* save this chunk for later processing */ + auth_skipped = 1; + auth_offset = *offset; + auth_len = ntohs(ch->chunk_length); + + /* (temporarily) move past this chunk */ + *offset += SCTP_SIZE32(auth_len); + if (*offset >= length) { + /* no more data left in the mbuf chain */ + *offset = length; + return (NULL); + } + ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, + sizeof(struct sctp_chunkhdr), chunk_buf); + } + if (ch == NULL) { + /* Help */ + *offset = length; + return (stcb); + } + if (ch->chunk_type == SCTP_COOKIE_ECHO) { + goto process_control_chunks; + } + /* + * first check if it's an ASCONF with an unknown src addr we + * need to look inside to find the association + */ + if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) { + struct sctp_chunkhdr *asconf_ch = ch; + uint32_t asconf_offset = 0, asconf_len = 0; + + /* inp's refcount may be reduced */ + SCTP_INP_INCR_REF(inp); + + asconf_offset = *offset; + do { + asconf_len = ntohs(asconf_ch->chunk_length); + if (asconf_len < sizeof(struct sctp_asconf_paramhdr)) + break; + stcb = sctp_findassociation_ep_asconf(m, + *offset, + dst, + sh, &inp, netp, vrf_id); + if (stcb != NULL) + break; + asconf_offset += SCTP_SIZE32(asconf_len); + asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset, + sizeof(struct sctp_chunkhdr), chunk_buf); + } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF); + if (stcb == NULL) { + /* + * reduce inp's refcount if not reduced in + * sctp_findassociation_ep_asconf(). + */ + SCTP_INP_DECR_REF(inp); + } + + /* now go back and verify any auth chunk to be sure */ + if (auth_skipped && (stcb != NULL)) { + struct sctp_auth_chunk *auth; + + if (auth_len <= SCTP_CHUNK_BUFFER_SIZE) { + auth = (struct sctp_auth_chunk *)sctp_m_getptr(m, auth_offset, auth_len, chunk_buf); + got_auth = 1; + auth_skipped = 0; + } else { + auth = NULL; + } + if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, + auth_offset)) { + /* auth HMAC failed so dump it */ + *offset = length; + return (stcb); + } else { + /* remaining chunks are HMAC checked */ + stcb->asoc.authenticated = 1; + } + } + } + if (stcb == NULL) { + SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); + op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), + msg); + /* no association, so it's out of the blue... */ + sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, op_err, +#if defined(__FreeBSD__) && !defined(__Userspace__) + mflowtype, mflowid, inp->fibnum, +#endif + vrf_id, port); + *offset = length; + return (NULL); + } + asoc = &stcb->asoc; + /* ABORT and SHUTDOWN can use either v_tag... */ + if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) || + (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) || + (ch->chunk_type == SCTP_PACKET_DROPPED)) { + /* Take the T-bit always into account. */ + if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) && + (vtag_in == asoc->my_vtag)) || + (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) && + (asoc->peer_vtag != htonl(0)) && + (vtag_in == asoc->peer_vtag))) { + /* this is valid */ + } else { + /* drop this packet... */ + SCTP_STAT_INCR(sctps_badvtag); + if (stcb != NULL) { + SCTP_TCB_UNLOCK(stcb); + } + return (NULL); + } + } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { + if (vtag_in != asoc->my_vtag) { + /* + * this could be a stale SHUTDOWN-ACK or the + * peer never got the SHUTDOWN-COMPLETE and + * is still hung; we have started a new asoc + * but it won't complete until the shutdown + * is completed + */ + if (stcb != NULL) { + SCTP_TCB_UNLOCK(stcb); + } + SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); + op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), + msg); + sctp_handle_ootb(m, iphlen, *offset, src, dst, + sh, inp, op_err, +#if defined(__FreeBSD__) && !defined(__Userspace__) + mflowtype, mflowid, fibnum, +#endif + vrf_id, port); + return (NULL); + } + } else { + /* for all other chunks, vtag must match */ + if (vtag_in != asoc->my_vtag) { + /* invalid vtag... */ + SCTPDBG(SCTP_DEBUG_INPUT3, + "invalid vtag: %xh, expect %xh\n", + vtag_in, asoc->my_vtag); + SCTP_STAT_INCR(sctps_badvtag); + if (stcb != NULL) { + SCTP_TCB_UNLOCK(stcb); + } + *offset = length; + return (NULL); + } + } + } /* end if !SCTP_COOKIE_ECHO */ + /* + * process all control chunks... + */ + if (((ch->chunk_type == SCTP_SELECTIVE_ACK) || + (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) || + (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) && + (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { + /* implied cookie-ack.. we must have lost the ack */ + sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, + *netp); + } + + process_control_chunks: + while (IS_SCTP_CONTROL(ch)) { + /* validate chunk length */ + chk_length = ntohs(ch->chunk_length); + SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n", + ch->chunk_type, chk_length); + SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length); + if (chk_length < sizeof(*ch) || + (*offset + (int)chk_length) > length) { + *offset = length; + return (stcb); + } + SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks); + /* + * INIT and INIT-ACK only gets the init ack "header" portion + * only because we don't have to process the peer's COOKIE. + * All others get a complete chunk. + */ + switch (ch->chunk_type) { + case SCTP_INITIATION: + contiguous = sizeof(struct sctp_init_chunk); + break; + case SCTP_INITIATION_ACK: + contiguous = sizeof(struct sctp_init_ack_chunk); + break; + default: + contiguous = min(chk_length, sizeof(chunk_buf)); + break; + } + ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, + contiguous, + chunk_buf); + if (ch == NULL) { + *offset = length; + if (stcb != NULL) { + SCTP_TCB_UNLOCK(stcb); + } + return (NULL); + } + + num_chunks++; + /* Save off the last place we got a control from */ + if (stcb != NULL) { + if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) { + /* + * allow last_control to be NULL if + * ASCONF... ASCONF processing will find the + * right net later + */ + if ((netp != NULL) && (*netp != NULL)) + stcb->asoc.last_control_chunk_from = *netp; + } + } +#ifdef SCTP_AUDITING_ENABLED + sctp_audit_log(0xB0, ch->chunk_type); +#endif + + /* check to see if this chunk required auth, but isn't */ + if ((stcb != NULL) && + sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) && + !stcb->asoc.authenticated) { + /* "silently" ignore */ + SCTP_STAT_INCR(sctps_recvauthmissing); + goto next_chunk; + } + switch (ch->chunk_type) { + case SCTP_INITIATION: + SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n"); + /* The INIT chunk must be the only chunk. */ + if ((num_chunks > 1) || + (length - *offset > (int)SCTP_SIZE32(chk_length))) { + /* RFC 4960 requires that no ABORT is sent */ + *offset = length; + if (stcb != NULL) { + SCTP_TCB_UNLOCK(stcb); + } + return (NULL); + } + /* Honor our resource limit. */ + if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) { + op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); + sctp_abort_association(inp, stcb, m, iphlen, + src, dst, sh, op_err, +#if defined(__FreeBSD__) && !defined(__Userspace__) + mflowtype, mflowid, +#endif + vrf_id, port); + *offset = length; + return (NULL); + } + sctp_handle_init(m, iphlen, *offset, src, dst, sh, + (struct sctp_init_chunk *)ch, inp, + stcb, *netp, &abort_no_unlock, +#if defined(__FreeBSD__) && !defined(__Userspace__) + mflowtype, mflowid, +#endif + vrf_id, port); + *offset = length; + if ((!abort_no_unlock) && (stcb != NULL)) { + SCTP_TCB_UNLOCK(stcb); + } + return (NULL); + break; + case SCTP_PAD_CHUNK: + break; + case SCTP_INITIATION_ACK: + SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT_ACK\n"); + if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { + /* We are not interested anymore */ + if ((stcb != NULL) && (stcb->asoc.total_output_queue_size)) { + ; + } else { + *offset = length; + if (stcb != NULL) { +#if defined(__APPLE__) && !defined(__Userspace__) + so = SCTP_INP_SO(inp); + atomic_add_int(&stcb->asoc.refcnt, 1); + SCTP_TCB_UNLOCK(stcb); + SCTP_SOCKET_LOCK(so, 1); + SCTP_TCB_LOCK(stcb); + atomic_subtract_int(&stcb->asoc.refcnt, 1); +#endif + (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, + SCTP_FROM_SCTP_INPUT + SCTP_LOC_29); +#if defined(__APPLE__) && !defined(__Userspace__) + SCTP_SOCKET_UNLOCK(so, 1); +#endif + } + return (NULL); + } + } + /* The INIT-ACK chunk must be the only chunk. */ + if ((num_chunks > 1) || + (length - *offset > (int)SCTP_SIZE32(chk_length))) { + *offset = length; + return (stcb); + } + if ((netp != NULL) && (*netp != NULL)) { + ret = sctp_handle_init_ack(m, iphlen, *offset, + src, dst, sh, + (struct sctp_init_ack_chunk *)ch, + stcb, *netp, + &abort_no_unlock, +#if defined(__FreeBSD__) && !defined(__Userspace__) + mflowtype, mflowid, +#endif + vrf_id); + } else { + ret = -1; + } + *offset = length; + if (abort_no_unlock) { + return (NULL); + } + /* + * Special case, I must call the output routine to + * get the cookie echoed + */ + if ((stcb != NULL) && (ret == 0)) { + sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); + } + return (stcb); + break; + case SCTP_SELECTIVE_ACK: + case SCTP_NR_SELECTIVE_ACK: + { + int abort_now = 0; + uint32_t a_rwnd, cum_ack; + uint16_t num_seg, num_nr_seg, num_dup; + uint8_t flags; + int offset_seg, offset_dup; + + SCTPDBG(SCTP_DEBUG_INPUT3, "%s\n", + ch->chunk_type == SCTP_SELECTIVE_ACK ? "SCTP_SACK" : "SCTP_NR_SACK"); + SCTP_STAT_INCR(sctps_recvsacks); + if (stcb == NULL) { + SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing %s chunk\n", + (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK"); + break; + } + if (ch->chunk_type == SCTP_SELECTIVE_ACK) { + if (chk_length < sizeof(struct sctp_sack_chunk)) { + SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n"); + break; + } + } else { + if (stcb->asoc.nrsack_supported == 0) { + goto unknown_chunk; + } + if (chk_length < sizeof(struct sctp_nr_sack_chunk)) { + SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR_SACK chunk, too small\n"); + break; + } + } + if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) { + /*- + * If we have sent a shutdown-ack, we will pay no + * attention to a sack sent in to us since + * we don't care anymore. + */ + break; + } + flags = ch->chunk_flags; + if (ch->chunk_type == SCTP_SELECTIVE_ACK) { + struct sctp_sack_chunk *sack; + + sack = (struct sctp_sack_chunk *)ch; + cum_ack = ntohl(sack->sack.cum_tsn_ack); + num_seg = ntohs(sack->sack.num_gap_ack_blks); + num_nr_seg = 0; + num_dup = ntohs(sack->sack.num_dup_tsns); + a_rwnd = ntohl(sack->sack.a_rwnd); + if (sizeof(struct sctp_sack_chunk) + + num_seg * sizeof(struct sctp_gap_ack_block) + + num_dup * sizeof(uint32_t) != chk_length) { + SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n"); + break; + } + offset_seg = *offset + sizeof(struct sctp_sack_chunk); + offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); + } else { + struct sctp_nr_sack_chunk *nr_sack; + + nr_sack = (struct sctp_nr_sack_chunk *)ch; + cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack); + num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks); + num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks); + num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns); + a_rwnd = ntohl(nr_sack->nr_sack.a_rwnd); + if (sizeof(struct sctp_nr_sack_chunk) + + (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) + + num_dup * sizeof(uint32_t) != chk_length) { + SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n"); + break; + } + offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk); + offset_dup = offset_seg + (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block); + } + SCTPDBG(SCTP_DEBUG_INPUT3, "%s process cum_ack:%x num_seg:%d a_rwnd:%d\n", + (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK", + cum_ack, num_seg, a_rwnd); + stcb->asoc.seen_a_sack_this_pkt = 1; + if ((stcb->asoc.pr_sctp_cnt == 0) && + (num_seg == 0) && (num_nr_seg == 0) && + SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && + (stcb->asoc.saw_sack_with_frags == 0) && + (stcb->asoc.saw_sack_with_nr_frags == 0) && + (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) { + /* + * We have a SIMPLE sack having no + * prior segments and data on sent + * queue to be acked. Use the + * faster path sack processing. We + * also allow window update sacks + * with no missing segments to go + * this way too. + */ + sctp_express_handle_sack(stcb, cum_ack, a_rwnd, + &abort_now, ecne_seen); + } else { + if ((netp != NULL) && (*netp != NULL)) { + sctp_handle_sack(m, offset_seg, offset_dup, stcb, + num_seg, num_nr_seg, num_dup, &abort_now, flags, + cum_ack, a_rwnd, ecne_seen); + } + } + if (abort_now) { + /* ABORT signal from sack processing */ + *offset = length; + return (NULL); + } + if (TAILQ_EMPTY(&stcb->asoc.send_queue) && + TAILQ_EMPTY(&stcb->asoc.sent_queue) && + (stcb->asoc.stream_queue_cnt == 0)) { + sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); + } + break; + } + case SCTP_HEARTBEAT_REQUEST: + SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n"); + if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { + SCTP_STAT_INCR(sctps_recvheartbeat); + sctp_send_heartbeat_ack(stcb, m, *offset, + chk_length, *netp); + } + break; + case SCTP_HEARTBEAT_ACK: + SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT_ACK\n"); + if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) { + /* Its not ours */ + *offset = length; + return (stcb); + } + SCTP_STAT_INCR(sctps_recvheartbeatack); + if ((netp != NULL) && (*netp != NULL)) { + sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch, + stcb, *netp); + } + break; + case SCTP_ABORT_ASSOCIATION: + SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n", + (void *)stcb); + *offset = length; + if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { + if (sctp_handle_abort((struct sctp_abort_chunk *)ch, stcb, *netp)) { + return (NULL); + } else { + return (stcb); + } + } else { + return (NULL); + } + break; + case SCTP_SHUTDOWN: + SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n", + (void *)stcb); + if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) { + *offset = length; + return (stcb); + } + if ((netp != NULL) && (*netp != NULL)) { + int abort_flag = 0; + + sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch, + stcb, *netp, &abort_flag); + if (abort_flag) { + *offset = length; + return (NULL); + } + } + break; + case SCTP_SHUTDOWN_ACK: + SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_ACK, stcb %p\n", (void *)stcb); + if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { + sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp); + } + *offset = length; + return (NULL); + break; + case SCTP_OPERATION_ERROR: + SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP_ERR\n"); + if ((stcb != NULL) && (netp != NULL) && (*netp != NULL) && + sctp_handle_error(ch, stcb, *netp, contiguous) < 0) { + *offset = length; + return (NULL); + } + break; + case SCTP_COOKIE_ECHO: + SCTPDBG(SCTP_DEBUG_INPUT3, + "SCTP_COOKIE_ECHO, stcb %p\n", (void *)stcb); + if ((stcb != NULL) && (stcb->asoc.total_output_queue_size > 0)) { + ; + } else { + if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { + /* We are not interested anymore */ + abend: + if (stcb != NULL) { + SCTP_TCB_UNLOCK(stcb); + } + *offset = length; + return (NULL); + } + } + /*- + * First are we accepting? We do this again here + * since it is possible that a previous endpoint WAS + * listening responded to a INIT-ACK and then + * closed. We opened and bound.. and are now no + * longer listening. + * + * XXXGL: notes on checking listen queue length. + * 1) SCTP_IS_LISTENING() doesn't necessarily mean + * SOLISTENING(), because a listening "UDP type" + * socket isn't listening in terms of the socket + * layer. It is a normal data flow socket, that + * can fork off new connections. Thus, we should + * look into sol_qlen only in case we are !UDP. + * 2) Checking sol_qlen in general requires locking + * the socket, and this code lacks that. + */ + if ((stcb == NULL) && + (!SCTP_IS_LISTENING(inp) || + (!(inp->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE) && +#if defined(__FreeBSD__) && !defined(__Userspace__) + inp->sctp_socket->sol_qlen >= inp->sctp_socket->sol_qlimit))) { +#else + inp->sctp_socket->so_qlen >= inp->sctp_socket->so_qlimit))) { +#endif + if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && + (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) { + op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); + sctp_abort_association(inp, stcb, m, iphlen, + src, dst, sh, op_err, +#if defined(__FreeBSD__) && !defined(__Userspace__) + mflowtype, mflowid, +#endif + vrf_id, port); + } + *offset = length; + return (NULL); + } else { + struct mbuf *ret_buf; + struct sctp_inpcb *linp; + struct sctp_tmit_chunk *chk; + + if (stcb) { + linp = NULL; + } else { + linp = inp; + } + + if (linp != NULL) { + SCTP_ASOC_CREATE_LOCK(linp); + if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || + (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) { + SCTP_ASOC_CREATE_UNLOCK(linp); + goto abend; + } + } + + if (netp != NULL) { + struct sctp_tcb *locked_stcb; + + locked_stcb = stcb; + ret_buf = + sctp_handle_cookie_echo(m, iphlen, + *offset, + src, dst, + sh, + (struct sctp_cookie_echo_chunk *)ch, + &inp, &stcb, netp, + auth_skipped, + auth_offset, + auth_len, + &locked_stcb, +#if defined(__FreeBSD__) && !defined(__Userspace__) + mflowtype, + mflowid, +#endif + vrf_id, + port); + if ((locked_stcb != NULL) && (locked_stcb != stcb)) { + SCTP_TCB_UNLOCK(locked_stcb); + } + if (stcb != NULL) { + SCTP_TCB_LOCK_ASSERT(stcb); + } + } else { + ret_buf = NULL; + } + if (linp != NULL) { + SCTP_ASOC_CREATE_UNLOCK(linp); + } + if (ret_buf == NULL) { + if (stcb != NULL) { + SCTP_TCB_UNLOCK(stcb); + } + SCTPDBG(SCTP_DEBUG_INPUT3, + "GAK, null buffer\n"); + *offset = length; + return (NULL); + } + /* if AUTH skipped, see if it verified... */ + if (auth_skipped) { + got_auth = 1; + auth_skipped = 0; + } + /* Restart the timer if we have pending data */ + TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { + if (chk->whoTo != NULL) { + break; + } + } + if (chk != NULL) { + sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); + } + } + break; + case SCTP_COOKIE_ACK: + SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE_ACK, stcb %p\n", (void *)stcb); + if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) { + return (stcb); + } + if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { + /* We are not interested anymore */ + if ((stcb) && (stcb->asoc.total_output_queue_size)) { + ; + } else if (stcb) { +#if defined(__APPLE__) && !defined(__Userspace__) + so = SCTP_INP_SO(inp); + atomic_add_int(&stcb->asoc.refcnt, 1); + SCTP_TCB_UNLOCK(stcb); + SCTP_SOCKET_LOCK(so, 1); + SCTP_TCB_LOCK(stcb); + atomic_subtract_int(&stcb->asoc.refcnt, 1); +#endif + (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, + SCTP_FROM_SCTP_INPUT + SCTP_LOC_30); +#if defined(__APPLE__) && !defined(__Userspace__) + SCTP_SOCKET_UNLOCK(so, 1); +#endif + *offset = length; + return (NULL); + } + } + if ((netp != NULL) && (*netp != NULL)) { + sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp); + } + break; + case SCTP_ECN_ECHO: + SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_ECHO\n"); + if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) { + /* Its not ours */ + *offset = length; + return (stcb); + } + if (stcb->asoc.ecn_supported == 0) { + goto unknown_chunk; + } + sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, stcb); + ecne_seen = 1; + break; + case SCTP_ECN_CWR: + SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_CWR\n"); + if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) { + *offset = length; + return (stcb); + } + if (stcb->asoc.ecn_supported == 0) { + goto unknown_chunk; + } + sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp); + break; + case SCTP_SHUTDOWN_COMPLETE: + SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_COMPLETE, stcb %p\n", (void *)stcb); + /* must be first and only chunk */ + if ((num_chunks > 1) || + (length - *offset > (int)SCTP_SIZE32(chk_length))) { + *offset = length; + return (stcb); + } + if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { + sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch, + stcb, *netp); + } + *offset = length; + return (NULL); + break; + case SCTP_ASCONF: + SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n"); + if (stcb != NULL) { + if (stcb->asoc.asconf_supported == 0) { + goto unknown_chunk; + } + sctp_handle_asconf(m, *offset, src, + (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0); + asconf_cnt++; + } + break; + case SCTP_ASCONF_ACK: + SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF_ACK\n"); + if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) { + /* Its not ours */ + *offset = length; + return (stcb); + } + if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { + if (stcb->asoc.asconf_supported == 0) { + goto unknown_chunk; + } + /* He's alive so give him credit */ + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { + sctp_misc_ints(SCTP_THRESHOLD_CLEAR, + stcb->asoc.overall_error_count, + 0, + SCTP_FROM_SCTP_INPUT, + __LINE__); + } + stcb->asoc.overall_error_count = 0; + sctp_handle_asconf_ack(m, *offset, + (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock); + if (abort_no_unlock) + return (NULL); + } + break; + case SCTP_FORWARD_CUM_TSN: + case SCTP_IFORWARD_CUM_TSN: + SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD_TSN\n"); + if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) { + /* Its not ours */ + *offset = length; + return (stcb); + } + + if (stcb != NULL) { + int abort_flag = 0; + + if (stcb->asoc.prsctp_supported == 0) { + goto unknown_chunk; + } + *fwd_tsn_seen = 1; + if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { + /* We are not interested anymore */ +#if defined(__APPLE__) && !defined(__Userspace__) + so = SCTP_INP_SO(inp); + atomic_add_int(&stcb->asoc.refcnt, 1); + SCTP_TCB_UNLOCK(stcb); + SCTP_SOCKET_LOCK(so, 1); + SCTP_TCB_LOCK(stcb); + atomic_subtract_int(&stcb->asoc.refcnt, 1); +#endif + (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, + SCTP_FROM_SCTP_INPUT + SCTP_LOC_31); +#if defined(__APPLE__) && !defined(__Userspace__) + SCTP_SOCKET_UNLOCK(so, 1); +#endif + *offset = length; + return (NULL); + } + /* + * For sending a SACK this looks like DATA + * chunks. + */ + stcb->asoc.last_data_chunk_from = stcb->asoc.last_control_chunk_from; + sctp_handle_forward_tsn(stcb, + (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset); + if (abort_flag) { + *offset = length; + return (NULL); + } + } + break; + case SCTP_STREAM_RESET: + SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n"); + if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) { + /* Its not ours */ + *offset = length; + return (stcb); + } + if (stcb->asoc.reconfig_supported == 0) { + goto unknown_chunk; + } + if (sctp_handle_stream_reset(stcb, m, *offset, ch)) { + /* stop processing */ + *offset = length; + return (NULL); + } + break; + case SCTP_PACKET_DROPPED: + SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n"); + /* re-get it all please */ + if (chk_length < sizeof(struct sctp_pktdrop_chunk)) { + /* Its not ours */ + *offset = length; + return (stcb); + } + + if ((ch != NULL) && (stcb != NULL) && (netp != NULL) && (*netp != NULL)) { + if (stcb->asoc.pktdrop_supported == 0) { + goto unknown_chunk; + } + sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch, + stcb, *netp, + min(chk_length, contiguous)); + } + break; + case SCTP_AUTHENTICATION: + SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n"); + if (stcb == NULL) { + /* save the first AUTH for later processing */ + if (auth_skipped == 0) { + auth_offset = *offset; + auth_len = chk_length; + auth_skipped = 1; + } + /* skip this chunk (temporarily) */ + goto next_chunk; + } + if (stcb->asoc.auth_supported == 0) { + goto unknown_chunk; + } + if ((chk_length < (sizeof(struct sctp_auth_chunk))) || + (chk_length > (sizeof(struct sctp_auth_chunk) + + SCTP_AUTH_DIGEST_LEN_MAX))) { + /* Its not ours */ + *offset = length; + return (stcb); + } + if (got_auth == 1) { + /* skip this chunk... it's already auth'd */ + goto next_chunk; + } + got_auth = 1; + if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch, + m, *offset)) { + /* auth HMAC failed so dump the packet */ + *offset = length; + return (stcb); + } else { + /* remaining chunks are HMAC checked */ + stcb->asoc.authenticated = 1; + } + break; + + default: + unknown_chunk: + /* it's an unknown chunk! */ + if ((ch->chunk_type & 0x40) && (stcb != NULL)) { + struct sctp_gen_error_cause *cause; + int len; + + op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_gen_error_cause), + 0, M_NOWAIT, 1, MT_DATA); + if (op_err != NULL) { + len = min(SCTP_SIZE32(chk_length), (uint32_t)(length - *offset)); + cause = mtod(op_err, struct sctp_gen_error_cause *); + cause->code = htons(SCTP_CAUSE_UNRECOG_CHUNK); + cause->length = htons((uint16_t)(len + sizeof(struct sctp_gen_error_cause))); + SCTP_BUF_LEN(op_err) = sizeof(struct sctp_gen_error_cause); + SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(m, *offset, len, M_NOWAIT); + if (SCTP_BUF_NEXT(op_err) != NULL) { +#ifdef SCTP_MBUF_LOGGING + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { + sctp_log_mbc(SCTP_BUF_NEXT(op_err), SCTP_MBUF_ICOPY); + } +#endif + sctp_queue_op_err(stcb, op_err); + } else { + sctp_m_freem(op_err); + } + } + } + if ((ch->chunk_type & 0x80) == 0) { + /* discard this packet */ + *offset = length; + return (stcb); + } /* else skip this bad chunk and continue... */ + break; + } /* switch (ch->chunk_type) */ + + + next_chunk: + /* get the next chunk */ + *offset += SCTP_SIZE32(chk_length); + if (*offset >= length) { + /* no more data left in the mbuf chain */ + break; + } + ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, + sizeof(struct sctp_chunkhdr), chunk_buf); + if (ch == NULL) { + *offset = length; + return (stcb); + } + } /* while */ + + if ((asconf_cnt > 0) && (stcb != NULL)) { + sctp_send_asconf_ack(stcb); + } + return (stcb); +} + + +/* + * common input chunk processing (v4 and v6) + */ +void +sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length, + struct sockaddr *src, struct sockaddr *dst, + struct sctphdr *sh, struct sctp_chunkhdr *ch, + uint8_t compute_crc, + uint8_t ecn_bits, +#if defined(__FreeBSD__) && !defined(__Userspace__) + uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum, +#endif + uint32_t vrf_id, uint16_t port) +{ + uint32_t high_tsn; + int fwd_tsn_seen = 0, data_processed = 0; + struct mbuf *m = *mm, *op_err; + char msg[SCTP_DIAG_INFO_LEN]; + int un_sent; + int cnt_ctrl_ready = 0; + struct sctp_inpcb *inp = NULL, *inp_decr = NULL; + struct sctp_tcb *stcb = NULL; + struct sctp_nets *net = NULL; +#if defined(__Userspace__) + struct socket *upcall_socket = NULL; +#endif + + SCTP_STAT_INCR(sctps_recvdatagrams); +#ifdef SCTP_AUDITING_ENABLED + sctp_audit_log(0xE0, 1); + sctp_auditing(0, inp, stcb, net); +#endif + if (compute_crc != 0) { + uint32_t check, calc_check; + + check = sh->checksum; + sh->checksum = 0; + calc_check = sctp_calculate_cksum(m, iphlen); + sh->checksum = check; + if (calc_check != check) { + SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x m:%p mlen:%d iphlen:%d\n", + calc_check, check, (void *)m, length, iphlen); + stcb = sctp_findassociation_addr(m, offset, src, dst, + sh, ch, &inp, &net, vrf_id); +#if defined(INET) || defined(INET6) + if ((ch->chunk_type != SCTP_INITIATION) && + (net != NULL) && (net->port != port)) { + if (net->port == 0) { + /* UDP encapsulation turned on. */ + net->mtu -= sizeof(struct udphdr); + if (stcb->asoc.smallest_mtu > net->mtu) { + sctp_pathmtu_adjustment(stcb, net->mtu); + } + } else if (port == 0) { + /* UDP encapsulation turned off. */ + net->mtu += sizeof(struct udphdr); + /* XXX Update smallest_mtu */ + } + net->port = port; + } +#endif +#if defined(__FreeBSD__) && !defined(__Userspace__) + if (net != NULL) { + net->flowtype = mflowtype; + net->flowid = mflowid; + } + SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); +#endif + if ((inp != NULL) && (stcb != NULL)) { + sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1); + sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED); + } else if ((inp != NULL) && (stcb == NULL)) { + inp_decr = inp; + } + SCTP_STAT_INCR(sctps_badsum); + SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors); + goto out; + } + } + /* Destination port of 0 is illegal, based on RFC4960. */ + if (sh->dest_port == 0) { + SCTP_STAT_INCR(sctps_hdrops); + goto out; + } + stcb = sctp_findassociation_addr(m, offset, src, dst, + sh, ch, &inp, &net, vrf_id); +#if defined(INET) || defined(INET6) + if ((ch->chunk_type != SCTP_INITIATION) && + (net != NULL) && (net->port != port)) { + if (net->port == 0) { + /* UDP encapsulation turned on. */ + net->mtu -= sizeof(struct udphdr); + if (stcb->asoc.smallest_mtu > net->mtu) { + sctp_pathmtu_adjustment(stcb, net->mtu); + } + } else if (port == 0) { + /* UDP encapsulation turned off. */ + net->mtu += sizeof(struct udphdr); + /* XXX Update smallest_mtu */ + } + net->port = port; + } +#endif +#if defined(__FreeBSD__) && !defined(__Userspace__) + if (net != NULL) { + net->flowtype = mflowtype; + net->flowid = mflowid; + } +#endif + if (inp == NULL) { +#if defined(__FreeBSD__) && !defined(__Userspace__) + SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); +#endif + SCTP_STAT_INCR(sctps_noport); +#if defined(__FreeBSD__) && !defined(__Userspace__) + if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) { + goto out; + } +#endif + if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { + sctp_send_shutdown_complete2(src, dst, sh, +#if defined(__FreeBSD__) && !defined(__Userspace__) + mflowtype, mflowid, fibnum, +#endif + vrf_id, port); + goto out; + } + if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) { + goto out; + } + if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) { + if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) || + ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) && + (ch->chunk_type != SCTP_INIT))) { + op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), + "Out of the blue"); + sctp_send_abort(m, iphlen, src, dst, + sh, 0, op_err, +#if defined(__FreeBSD__) && !defined(__Userspace__) + mflowtype, mflowid, fibnum, +#endif + vrf_id, port); + } + } + goto out; + } else if (stcb == NULL) { + inp_decr = inp; + } + SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n", + (void *)m, iphlen, offset, length, (void *)stcb); + if (stcb) { + /* always clear this before beginning a packet */ + stcb->asoc.authenticated = 0; + stcb->asoc.seen_a_sack_this_pkt = 0; + SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n", + (void *)stcb, stcb->asoc.state); + + if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) || + (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) { + /*- + * If we hit here, we had a ref count + * up when the assoc was aborted and the + * timer is clearing out the assoc, we should + * NOT respond to any packet.. its OOTB. + */ + SCTP_TCB_UNLOCK(stcb); + stcb = NULL; +#if defined(__FreeBSD__) && !defined(__Userspace__) + SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); +#endif + SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); + op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), + msg); + sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, +#if defined(__FreeBSD__) && !defined(__Userspace__) + mflowtype, mflowid, inp->fibnum, +#endif + vrf_id, port); + goto out; + } + } +#if defined(__Userspace__) + if ((stcb != NULL) && + !(stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) && + (stcb->sctp_socket != NULL)) { + if (stcb->sctp_socket->so_head != NULL) { + upcall_socket = stcb->sctp_socket->so_head; + } else { + upcall_socket = stcb->sctp_socket; + } + SOCK_LOCK(upcall_socket); + soref(upcall_socket); + SOCK_UNLOCK(upcall_socket); + } +#endif + if (IS_SCTP_CONTROL(ch)) { + /* process the control portion of the SCTP packet */ + /* sa_ignore NO_NULL_CHK */ + stcb = sctp_process_control(m, iphlen, &offset, length, + src, dst, sh, ch, + inp, stcb, &net, &fwd_tsn_seen, +#if defined(__FreeBSD__) && !defined(__Userspace__) + mflowtype, mflowid, fibnum, +#endif + vrf_id, port); + if (stcb) { + /* This covers us if the cookie-echo was there + * and it changes our INP. + */ + inp = stcb->sctp_ep; +#if defined(INET) || defined(INET6) + if ((ch->chunk_type != SCTP_INITIATION) && + (net != NULL) && (net->port != port)) { + if (net->port == 0) { + /* UDP encapsulation turned on. */ + net->mtu -= sizeof(struct udphdr); + if (stcb->asoc.smallest_mtu > net->mtu) { + sctp_pathmtu_adjustment(stcb, net->mtu); + } + } else if (port == 0) { + /* UDP encapsulation turned off. */ + net->mtu += sizeof(struct udphdr); + /* XXX Update smallest_mtu */ + } + net->port = port; + } +#endif + } + } else { + /* + * no control chunks, so pre-process DATA chunks (these + * checks are taken care of by control processing) + */ + + /* + * if DATA only packet, and auth is required, then punt... + * can't have authenticated without any AUTH (control) + * chunks + */ + if ((stcb != NULL) && + sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) { + /* "silently" ignore */ +#if defined(__FreeBSD__) && !defined(__Userspace__) + SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); +#endif + SCTP_STAT_INCR(sctps_recvauthmissing); + goto out; + } + if (stcb == NULL) { + /* out of the blue DATA chunk */ +#if defined(__FreeBSD__) && !defined(__Userspace__) + SCTP_PROBE5(receive, NULL, NULL, m, NULL, sh); +#endif + SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); + op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), + msg); + sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, +#if defined(__FreeBSD__) && !defined(__Userspace__) + mflowtype, mflowid, fibnum, +#endif + vrf_id, port); + goto out; + } + if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) { + /* v_tag mismatch! */ +#if defined(__FreeBSD__) && !defined(__Userspace__) + SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); +#endif + SCTP_STAT_INCR(sctps_badvtag); + goto out; + } + } + +#if defined(__FreeBSD__) && !defined(__Userspace__) + SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); +#endif + if (stcb == NULL) { + /* + * no valid TCB for this packet, or we found it's a bad + * packet while processing control, or we're done with this + * packet (done or skip rest of data), so we drop it... + */ + goto out; + } +#if defined(__Userspace__) + if ((upcall_socket == NULL) && + !(stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) && + (stcb->sctp_socket != NULL)) { + if (stcb->sctp_socket->so_head != NULL) { + upcall_socket = stcb->sctp_socket->so_head; + } else { + upcall_socket = stcb->sctp_socket; + } + SOCK_LOCK(upcall_socket); + soref(upcall_socket); + SOCK_UNLOCK(upcall_socket); + } +#endif + + /* + * DATA chunk processing + */ + /* plow through the data chunks while length > offset */ + + /* + * Rest should be DATA only. Check authentication state if AUTH for + * DATA is required. + */ + if ((length > offset) && + (stcb != NULL) && + sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) && + !stcb->asoc.authenticated) { + /* "silently" ignore */ + SCTP_STAT_INCR(sctps_recvauthmissing); + SCTPDBG(SCTP_DEBUG_AUTH1, + "Data chunk requires AUTH, skipped\n"); + goto trigger_send; + } + if (length > offset) { + int retval; + + /* + * First check to make sure our state is correct. We would + * not get here unless we really did have a tag, so we don't + * abort if this happens, just dump the chunk silently. + */ + switch (SCTP_GET_STATE(stcb)) { + case SCTP_STATE_COOKIE_ECHOED: + /* + * we consider data with valid tags in this state + * shows us the cookie-ack was lost. Imply it was + * there. + */ + sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net); + break; + case SCTP_STATE_COOKIE_WAIT: + /* + * We consider OOTB any data sent during asoc setup. + */ + SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); + op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), + msg); + sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, +#if defined(__FreeBSD__) && !defined(__Userspace__) + mflowtype, mflowid, inp->fibnum, +#endif + vrf_id, port); + goto out; + /*sa_ignore NOTREACHED*/ + break; + case SCTP_STATE_EMPTY: /* should not happen */ + case SCTP_STATE_INUSE: /* should not happen */ + case SCTP_STATE_SHUTDOWN_RECEIVED: /* This is a peer error */ + case SCTP_STATE_SHUTDOWN_ACK_SENT: + default: + goto out; + /*sa_ignore NOTREACHED*/ + break; + case SCTP_STATE_OPEN: + case SCTP_STATE_SHUTDOWN_SENT: + break; + } + /* plow through the data chunks while length > offset */ + retval = sctp_process_data(mm, iphlen, &offset, length, + inp, stcb, net, &high_tsn); + if (retval == 2) { + /* + * The association aborted, NO UNLOCK needed since + * the association is destroyed. + */ + stcb = NULL; + goto out; + } + data_processed = 1; + /* + * Anything important needs to have been m_copy'ed in + * process_data + */ + } + + /* take care of ecn */ + if ((data_processed == 1) && + (stcb->asoc.ecn_supported == 1) && + ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) { + /* Yep, we need to add a ECNE */ + sctp_send_ecn_echo(stcb, net, high_tsn); + } + + if ((data_processed == 0) && (fwd_tsn_seen)) { + int was_a_gap; + uint32_t highest_tsn; + + if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) { + highest_tsn = stcb->asoc.highest_tsn_inside_nr_map; + } else { + highest_tsn = stcb->asoc.highest_tsn_inside_map; + } + was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn); + stcb->asoc.send_sack = 1; + sctp_sack_check(stcb, was_a_gap); + } else if (fwd_tsn_seen) { + stcb->asoc.send_sack = 1; + } + /* trigger send of any chunks in queue... */ +trigger_send: +#ifdef SCTP_AUDITING_ENABLED + sctp_audit_log(0xE0, 2); + sctp_auditing(1, inp, stcb, net); +#endif + SCTPDBG(SCTP_DEBUG_INPUT1, + "Check for chunk output prw:%d tqe:%d tf=%d\n", + stcb->asoc.peers_rwnd, + TAILQ_EMPTY(&stcb->asoc.control_send_queue), + stcb->asoc.total_flight); + un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight); + if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { + cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq; + } + if (!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue) || + cnt_ctrl_ready || + stcb->asoc.trigger_reset || + ((un_sent > 0) && + (stcb->asoc.peers_rwnd > 0 || stcb->asoc.total_flight == 0))) { + SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n"); + sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); + SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n"); + } +#ifdef SCTP_AUDITING_ENABLED + sctp_audit_log(0xE0, 3); + sctp_auditing(2, inp, stcb, net); +#endif + out: + if (stcb != NULL) { + SCTP_TCB_UNLOCK(stcb); + } +#if defined(__Userspace__) + if (upcall_socket != NULL) { + if (upcall_socket->so_upcall != NULL) { + if (soreadable(upcall_socket) || + sowriteable(upcall_socket) || + upcall_socket->so_error) { + (*upcall_socket->so_upcall)(upcall_socket, upcall_socket->so_upcallarg, M_NOWAIT); + } + } + ACCEPT_LOCK(); + SOCK_LOCK(upcall_socket); + sorele(upcall_socket); + } +#endif + if (inp_decr != NULL) { + /* reduce ref-count */ + SCTP_INP_WLOCK(inp_decr); + SCTP_INP_DECR_REF(inp_decr); + SCTP_INP_WUNLOCK(inp_decr); + } + return; +} + +#ifdef INET +#if !defined(__Userspace__) +void +sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port) +{ + struct mbuf *m; + int iphlen; + uint32_t vrf_id = 0; + uint8_t ecn_bits; + struct sockaddr_in src, dst; + struct ip *ip; + struct sctphdr *sh; + struct sctp_chunkhdr *ch; + int length, offset; + uint8_t compute_crc; +#if defined(__FreeBSD__) && !defined(__Userspace__) + uint32_t mflowid; + uint8_t mflowtype; + uint16_t fibnum; +#endif +#if defined(__Userspace__) + uint16_t port = 0; +#endif + + iphlen = off; + if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) { + SCTP_RELEASE_PKT(i_pak); + return; + } + m = SCTP_HEADER_TO_CHAIN(i_pak); +#ifdef SCTP_MBUF_LOGGING + /* Log in any input mbufs */ + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { + sctp_log_mbc(m, SCTP_MBUF_INPUT); + } +#endif +#ifdef SCTP_PACKET_LOGGING + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) { + sctp_packet_log(m); + } +#endif +#if defined(__FreeBSD__) && !defined(__Userspace__) + SCTPDBG(SCTP_DEBUG_CRCOFFLOAD, + "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n", + m->m_pkthdr.len, + if_name(m->m_pkthdr.rcvif), + (int)m->m_pkthdr.csum_flags, CSUM_BITS); +#endif +#if defined(__APPLE__) && !defined(__Userspace__) + SCTPDBG(SCTP_DEBUG_CRCOFFLOAD, + "sctp_input(): Packet of length %d received on %s%d with csum_flags 0x%x.\n", + m->m_pkthdr.len, + m->m_pkthdr.rcvif->if_name, + m->m_pkthdr.rcvif->if_unit, + m->m_pkthdr.csum_flags); +#endif +#if defined(_WIN32) && !defined(__Userspace__) + SCTPDBG(SCTP_DEBUG_CRCOFFLOAD, + "sctp_input(): Packet of length %d received on %s with csum_flags 0x%x.\n", + m->m_pkthdr.len, + m->m_pkthdr.rcvif->if_xname, + m->m_pkthdr.csum_flags); +#endif +#if defined(__FreeBSD__) && !defined(__Userspace__) + mflowid = m->m_pkthdr.flowid; + mflowtype = M_HASHTYPE_GET(m); + fibnum = M_GETFIB(m); +#endif + SCTP_STAT_INCR(sctps_recvpackets); + SCTP_STAT_INCR_COUNTER64(sctps_inpackets); + /* Get IP, SCTP, and first chunk header together in the first mbuf. */ + offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr); + if (SCTP_BUF_LEN(m) < offset) { + if ((m = m_pullup(m, offset)) == NULL) { + SCTP_STAT_INCR(sctps_hdrops); + return; + } + } + ip = mtod(m, struct ip *); + sh = (struct sctphdr *)((caddr_t)ip + iphlen); + ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr)); + offset -= sizeof(struct sctp_chunkhdr); + memset(&src, 0, sizeof(struct sockaddr_in)); + src.sin_family = AF_INET; +#ifdef HAVE_SIN_LEN + src.sin_len = sizeof(struct sockaddr_in); +#endif + src.sin_port = sh->src_port; + src.sin_addr = ip->ip_src; + memset(&dst, 0, sizeof(struct sockaddr_in)); + dst.sin_family = AF_INET; +#ifdef HAVE_SIN_LEN + dst.sin_len = sizeof(struct sockaddr_in); +#endif + dst.sin_port = sh->dest_port; + dst.sin_addr = ip->ip_dst; +#if defined(_WIN32) && !defined(__Userspace__) + NTOHS(ip->ip_len); +#endif +#if defined(__linux__) || (defined(_WIN32) && defined(__Userspace__)) + ip->ip_len = ntohs(ip->ip_len); +#endif +#if defined(__Userspace__) +#if defined(__linux__) || defined(_WIN32) + length = ip->ip_len; +#else + length = ip->ip_len + iphlen; +#endif +#elif defined(__FreeBSD__) + length = ntohs(ip->ip_len); +#elif defined(__APPLE__) + length = ip->ip_len + iphlen; +#else + length = ip->ip_len; +#endif + /* Validate mbuf chain length with IP payload length. */ + if (SCTP_HEADER_LEN(m) != length) { + SCTPDBG(SCTP_DEBUG_INPUT1, + "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m)); + SCTP_STAT_INCR(sctps_hdrops); + goto out; + } + /* SCTP does not allow broadcasts or multicasts */ + if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) { + goto out; + } + if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) { + goto out; + } + ecn_bits = ip->ip_tos; +#if defined(__FreeBSD__) && !defined(__Userspace__) + if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) { + SCTP_STAT_INCR(sctps_recvhwcrc); + compute_crc = 0; + } else { +#else + if (SCTP_BASE_SYSCTL(sctp_no_csum_on_loopback) && + ((src.sin_addr.s_addr == dst.sin_addr.s_addr) || + (SCTP_IS_IT_LOOPBACK(m)))) { + SCTP_STAT_INCR(sctps_recvhwcrc); + compute_crc = 0; + } else { +#endif + SCTP_STAT_INCR(sctps_recvswcrc); + compute_crc = 1; + } + sctp_common_input_processing(&m, iphlen, offset, length, + (struct sockaddr *)&src, + (struct sockaddr *)&dst, + sh, ch, + compute_crc, + ecn_bits, +#if defined(__FreeBSD__) && !defined(__Userspace__) + mflowtype, mflowid, fibnum, +#endif + vrf_id, port); + out: + if (m) { + sctp_m_freem(m); + } + return; +} + +#if defined(__FreeBSD__) && !defined(__Userspace__) +#if defined(SCTP_MCORE_INPUT) && defined(SMP) +extern int *sctp_cpuarry; +#endif +#endif + +#if defined(__FreeBSD__) && !defined(__Userspace__) +int +sctp_input(struct mbuf **mp, int *offp, int proto SCTP_UNUSED) +{ + struct mbuf *m; + int off; + + m = *mp; + off = *offp; +#else +void +sctp_input(struct mbuf *m, int off) +{ +#endif +#if defined(__FreeBSD__) && !defined(__Userspace__) +#if defined(SCTP_MCORE_INPUT) && defined(SMP) + if (mp_ncpus > 1) { + struct ip *ip; + struct sctphdr *sh; + int offset; + int cpu_to_use; + uint32_t flowid, tag; + + if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) { + flowid = m->m_pkthdr.flowid; + } else { + /* No flow id built by lower layers + * fix it so we create one. + */ + offset = off + sizeof(struct sctphdr); + if (SCTP_BUF_LEN(m) < offset) { + if ((m = m_pullup(m, offset)) == NULL) { + SCTP_STAT_INCR(sctps_hdrops); + return (IPPROTO_DONE); + } + } + ip = mtod(m, struct ip *); + sh = (struct sctphdr *)((caddr_t)ip + off); + tag = htonl(sh->v_tag); + flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port); + m->m_pkthdr.flowid = flowid; + M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE_HASH); + } + cpu_to_use = sctp_cpuarry[flowid % mp_ncpus]; + sctp_queue_to_mcore(m, off, cpu_to_use); + return (IPPROTO_DONE); + } +#endif +#endif + sctp_input_with_port(m, off, 0); +#if defined(__FreeBSD__) && !defined(__Userspace__) + return (IPPROTO_DONE); +#endif +} +#endif +#endif |