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-rw-r--r--isisd/isis_dlpi.c593
1 files changed, 593 insertions, 0 deletions
diff --git a/isisd/isis_dlpi.c b/isisd/isis_dlpi.c
new file mode 100644
index 0000000..1f09152
--- /dev/null
+++ b/isisd/isis_dlpi.c
@@ -0,0 +1,593 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * IS-IS Rout(e)ing protocol - isis_dlpi.c
+ *
+ * Copyright (C) 2001,2002 Sampo Saaristo
+ * Tampere University of Technology
+ * Institute of Communications Engineering
+ */
+
+#include <zebra.h>
+#if ISIS_METHOD == ISIS_METHOD_DLPI
+#include <net/if.h>
+#include <netinet/if_ether.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <stropts.h>
+#include <poll.h>
+#include <sys/dlpi.h>
+#include <sys/pfmod.h>
+
+#include "log.h"
+#include "network.h"
+#include "stream.h"
+#include "if.h"
+#include "lib_errors.h"
+
+#include "isisd/isis_constants.h"
+#include "isisd/isis_common.h"
+#include "isisd/isis_circuit.h"
+#include "isisd/isis_flags.h"
+#include "isisd/isisd.h"
+#include "isisd/isis_network.h"
+
+#include "privs.h"
+
+static t_uscalar_t dlpi_ctl[1024]; /* DLPI control messages */
+
+/*
+ * Table 9 - Architectural constants for use with ISO 8802 subnetworks
+ * ISO 10589 - 8.4.8
+ */
+
+static const uint8_t ALL_L1_ISS[6] = {0x01, 0x80, 0xC2, 0x00, 0x00, 0x14};
+static const uint8_t ALL_L2_ISS[6] = {0x01, 0x80, 0xC2, 0x00, 0x00, 0x15};
+static const uint8_t ALL_ISS[6] = {0x09, 0x00, 0x2B, 0x00, 0x00, 0x05};
+static uint8_t sock_buff[16384];
+
+static unsigned short pf_filter[] = {
+ ENF_PUSHWORD + 0, /* Get the SSAP/DSAP values */
+ ENF_PUSHLIT | ENF_CAND, /* Check them */
+ ISO_SAP | (ISO_SAP << 8),
+ ENF_PUSHWORD + 1, /* Get the control value */
+ ENF_PUSHLIT | ENF_AND, /* Isolate it */
+#ifdef _BIG_ENDIAN
+ 0xFF00,
+#else
+ 0x00FF,
+#endif
+ ENF_PUSHLIT | ENF_CAND, /* Test for expected value */
+#ifdef _BIG_ENDIAN
+ 0x0300
+#else
+ 0x0003
+#endif
+};
+
+/*
+ * We would like to use something like libdlpi here, but that's not present on
+ * all versions of Solaris or on any non-Solaris system, so it's nowhere near
+ * as portable as we'd like. Thus, we use the standards-conformant DLPI
+ * interfaces plus the (optional; not needed) Solaris packet filter module.
+ */
+
+static int dlpisend(int fd, const void *cbuf, size_t cbuflen, const void *dbuf,
+ size_t dbuflen, int flags)
+{
+ const struct strbuf *ctlptr = NULL;
+ const struct strbuf *dataptr = NULL;
+ struct strbuf ctlbuf, databuf;
+ int rv;
+
+ if (cbuf != NULL) {
+ memset(&ctlbuf, 0, sizeof(ctlbuf));
+ ctlbuf.len = cbuflen;
+ ctlbuf.buf = (void *)cbuf;
+ ctlptr = &ctlbuf;
+ }
+
+ if (dbuf != NULL) {
+ memset(&databuf, 0, sizeof(databuf));
+ databuf.len = dbuflen;
+ databuf.buf = (void *)dbuf;
+ dataptr = &databuf;
+ }
+
+ /* We assume this doesn't happen often and isn't operationally
+ * significant */
+ rv = putmsg(fd, ctlptr, dataptr, flags);
+ if (rv == -1 && dbuf == NULL) {
+ /*
+ * For actual PDU transmission - recognizable buf dbuf != NULL,
+ * the error is passed upwards and should not be printed here.
+ */
+ zlog_debug("%s: putmsg: %s", __func__, safe_strerror(errno));
+ }
+ return rv;
+}
+
+static ssize_t dlpirctl(int fd)
+{
+ struct pollfd fds[1];
+ struct strbuf ctlbuf, databuf;
+ int flags, retv;
+
+ do {
+ /* Poll is used here in case the device doesn't speak DLPI
+ * correctly */
+ memset(fds, 0, sizeof(fds));
+ fds[0].fd = fd;
+ fds[0].events = POLLIN | POLLPRI;
+ if (poll(fds, 1, 1000) <= 0)
+ return -1;
+
+ memset(&ctlbuf, 0, sizeof(ctlbuf));
+ memset(&databuf, 0, sizeof(databuf));
+ ctlbuf.maxlen = sizeof(dlpi_ctl);
+ ctlbuf.buf = (void *)dlpi_ctl;
+ databuf.maxlen = sizeof(sock_buff);
+ databuf.buf = (void *)sock_buff;
+ flags = 0;
+ retv = getmsg(fd, &ctlbuf, &databuf, &flags);
+
+ if (retv < 0)
+ return -1;
+ } while (ctlbuf.len == 0);
+
+ if (!(retv & MORECTL)) {
+ while (retv & MOREDATA) {
+ flags = 0;
+ retv = getmsg(fd, NULL, &databuf, &flags);
+ }
+ return ctlbuf.len;
+ }
+
+ while (retv & MORECTL) {
+ flags = 0;
+ retv = getmsg(fd, &ctlbuf, &databuf, &flags);
+ }
+ return -1;
+}
+
+static int dlpiok(int fd, t_uscalar_t oprim)
+{
+ int retv;
+ dl_ok_ack_t *doa = (dl_ok_ack_t *)dlpi_ctl;
+
+ retv = dlpirctl(fd);
+ if (retv < (ssize_t)DL_OK_ACK_SIZE || doa->dl_primitive != DL_OK_ACK
+ || doa->dl_correct_primitive != oprim) {
+ return -1;
+ } else {
+ return 0;
+ }
+}
+
+static int dlpiinfo(int fd)
+{
+ dl_info_req_t dir;
+ ssize_t retv;
+
+ memset(&dir, 0, sizeof(dir));
+ dir.dl_primitive = DL_INFO_REQ;
+ /* Info_req uses M_PCPROTO. */
+ dlpisend(fd, &dir, sizeof(dir), NULL, 0, RS_HIPRI);
+ retv = dlpirctl(fd);
+ if (retv < (ssize_t)DL_INFO_ACK_SIZE || dlpi_ctl[0] != DL_INFO_ACK)
+ return -1;
+ else
+ return retv;
+}
+
+static int dlpiopen(const char *devpath, ssize_t *acklen)
+{
+ int fd, flags;
+
+ fd = open(devpath, O_RDWR | O_NONBLOCK | O_NOCTTY);
+ if (fd == -1)
+ return -1;
+
+ /* All that we want is for the open itself to be non-blocking, not I/O.
+ */
+ flags = fcntl(fd, F_GETFL, 0);
+ if (flags != -1)
+ fcntl(fd, F_SETFL, flags & ~O_NONBLOCK);
+
+ /* After opening, ask for information */
+ if ((*acklen = dlpiinfo(fd)) == -1) {
+ close(fd);
+ return -1;
+ }
+
+ return fd;
+}
+
+static int dlpiattach(int fd, int unit)
+{
+ dl_attach_req_t dar;
+
+ memset(&dar, 0, sizeof(dar));
+ dar.dl_primitive = DL_ATTACH_REQ;
+ dar.dl_ppa = unit;
+ dlpisend(fd, &dar, sizeof(dar), NULL, 0, 0);
+ return dlpiok(fd, dar.dl_primitive);
+}
+
+static int dlpibind(int fd)
+{
+ dl_bind_req_t dbr;
+ int retv;
+ dl_bind_ack_t *dba = (dl_bind_ack_t *)dlpi_ctl;
+
+ memset(&dbr, 0, sizeof(dbr));
+ dbr.dl_primitive = DL_BIND_REQ;
+ dbr.dl_service_mode = DL_CLDLS;
+ dlpisend(fd, &dbr, sizeof(dbr), NULL, 0, 0);
+
+ retv = dlpirctl(fd);
+ if (retv < (ssize_t)DL_BIND_ACK_SIZE
+ || dba->dl_primitive != DL_BIND_ACK)
+ return -1;
+ else
+ return 0;
+}
+
+static int dlpimcast(int fd, const uint8_t *mcaddr)
+{
+ struct {
+ dl_enabmulti_req_t der;
+ uint8_t addr[ETHERADDRL];
+ } dler;
+
+ memset(&dler, 0, sizeof(dler));
+ dler.der.dl_primitive = DL_ENABMULTI_REQ;
+ dler.der.dl_addr_length = sizeof(dler.addr);
+ dler.der.dl_addr_offset = dler.addr - (uint8_t *)&dler;
+ memcpy(dler.addr, mcaddr, sizeof(dler.addr));
+ dlpisend(fd, &dler, sizeof(dler), NULL, 0, 0);
+ return dlpiok(fd, dler.der.dl_primitive);
+}
+
+static int dlpiaddr(int fd, uint8_t *addr)
+{
+ dl_phys_addr_req_t dpar;
+ dl_phys_addr_ack_t *dpaa = (dl_phys_addr_ack_t *)dlpi_ctl;
+ int retv;
+
+ memset(&dpar, 0, sizeof(dpar));
+ dpar.dl_primitive = DL_PHYS_ADDR_REQ;
+ dpar.dl_addr_type = DL_CURR_PHYS_ADDR;
+ dlpisend(fd, &dpar, sizeof(dpar), NULL, 0, 0);
+
+ retv = dlpirctl(fd);
+ if (retv < (ssize_t)DL_PHYS_ADDR_ACK_SIZE
+ || dpaa->dl_primitive != DL_PHYS_ADDR_ACK)
+ return -1;
+
+ if (dpaa->dl_addr_offset < DL_PHYS_ADDR_ACK_SIZE
+ || dpaa->dl_addr_length != ETHERADDRL
+ || dpaa->dl_addr_offset + dpaa->dl_addr_length > (size_t)retv)
+ return -1;
+
+ bcopy((char *)dpaa + dpaa->dl_addr_offset, addr, ETHERADDRL);
+ return 0;
+}
+
+static int open_dlpi_dev(struct isis_circuit *circuit)
+{
+ int fd = -1, unit, retval;
+ char devpath[MAXPATHLEN];
+ dl_info_ack_t *dia = (dl_info_ack_t *)dlpi_ctl;
+ ssize_t acklen;
+
+ /* Only broadcast-type are supported at the moment */
+ if (circuit->circ_type != CIRCUIT_T_BROADCAST) {
+ zlog_warn("%s: non-broadcast interface %s", __func__,
+ circuit->interface->name);
+ return ISIS_WARNING;
+ }
+
+ /* Try the vanity node first, if permitted */
+ if (getenv("DLPI_DEVONLY") == NULL) {
+ (void)snprintf(devpath, sizeof(devpath), "/dev/net/%s",
+ circuit->interface->name);
+ fd = dlpiopen(devpath, &acklen);
+ }
+
+ /* Now try as an ordinary Style 1 node */
+ if (fd == -1) {
+ (void)snprintf(devpath, sizeof(devpath), "/dev/%s",
+ circuit->interface->name);
+ unit = -1;
+ fd = dlpiopen(devpath, &acklen);
+ }
+
+ /* If that fails, try again as Style 2 */
+ if (fd == -1) {
+ char *cp;
+
+ cp = devpath + strlen(devpath);
+ while (--cp >= devpath && isdigit(*cp))
+ ;
+ unit = strtol(cp, NULL, 0);
+ *cp = '\0';
+ fd = dlpiopen(devpath, &acklen);
+
+ /* If that too fails, then the device really doesn't exist */
+ if (fd == -1) {
+ zlog_warn("%s: unknown interface %s", __func__,
+ circuit->interface->name);
+ return ISIS_WARNING;
+ }
+
+ /* Double check the DLPI style */
+ if (dia->dl_provider_style != DL_STYLE2) {
+ zlog_warn("%s: interface %s: %s is not style 2",
+ __func__, circuit->interface->name, devpath);
+ close(fd);
+ return ISIS_WARNING;
+ }
+
+ /* If it succeeds, then we need to attach to the unit specified
+ */
+ dlpiattach(fd, unit);
+
+ /* Reget the information, as it may be different per node */
+ if ((acklen = dlpiinfo(fd)) == -1) {
+ close(fd);
+ return ISIS_WARNING;
+ }
+ } else {
+ /* Double check the DLPI style */
+ if (dia->dl_provider_style != DL_STYLE1) {
+ zlog_warn("%s: interface %s: %s is not style 1",
+ __func__, circuit->interface->name, devpath);
+ close(fd);
+ return ISIS_WARNING;
+ }
+ }
+
+ /* Check that the interface we've got is the kind we expect */
+ if ((dia->dl_sap_length != 2 && dia->dl_sap_length != -2)
+ || dia->dl_service_mode != DL_CLDLS
+ || dia->dl_addr_length != ETHERADDRL + 2
+ || dia->dl_brdcst_addr_length != ETHERADDRL) {
+ zlog_warn("%s: unsupported interface type for %s", __func__,
+ circuit->interface->name);
+ close(fd);
+ return ISIS_WARNING;
+ }
+ switch (dia->dl_mac_type) {
+ case DL_CSMACD:
+ case DL_ETHER:
+ case DL_100VG:
+ case DL_100VGTPR:
+ case DL_ETH_CSMA:
+ case DL_100BT:
+ break;
+ default:
+ zlog_warn("%s: unexpected mac type on %s: %lld", __func__,
+ circuit->interface->name,
+ (long long)dia->dl_mac_type);
+ close(fd);
+ return ISIS_WARNING;
+ }
+
+ circuit->sap_length = dia->dl_sap_length;
+
+ /*
+ * The local hardware address is something that should be provided by
+ * way of
+ * sockaddr_dl for the interface, but isn't on Solaris. We set it here
+ * based
+ * on DLPI's reported address to avoid roto-tilling the world.
+ * (Note that isis_circuit_if_add on Solaris doesn't set the snpa.)
+ *
+ * Unfortunately, GLD is broken and doesn't provide the address after
+ * attach,
+ * so we need to be careful and use DL_PHYS_ADDR_REQ instead.
+ */
+ if (dlpiaddr(fd, circuit->u.bc.snpa) == -1) {
+ zlog_warn("%s: interface %s: unable to get MAC address",
+ __func__, circuit->interface->name);
+ close(fd);
+ return ISIS_WARNING;
+ }
+
+ /* Now bind to SAP 0. This gives us 802-type traffic. */
+ if (dlpibind(fd) == -1) {
+ zlog_warn("%s: cannot bind SAP 0 on %s", __func__,
+ circuit->interface->name);
+ close(fd);
+ return ISIS_WARNING;
+ }
+
+ /*
+ * Join to multicast groups according to
+ * 8.4.2 - Broadcast subnetwork IIH PDUs
+ */
+ retval = 0;
+ retval |= dlpimcast(fd, ALL_L1_ISS);
+ retval |= dlpimcast(fd, ALL_ISS);
+ retval |= dlpimcast(fd, ALL_L2_ISS);
+
+ if (retval != 0) {
+ zlog_warn("%s: unable to join multicast on %s", __func__,
+ circuit->interface->name);
+ close(fd);
+ return ISIS_WARNING;
+ }
+
+ /* Push on the packet filter to avoid stray 802 packets */
+ if (ioctl(fd, I_PUSH, "pfmod") == 0) {
+ struct packetfilt pfil;
+ struct strioctl sioc;
+
+ pfil.Pf_Priority = 0;
+ pfil.Pf_FilterLen = array_size(pf_filter);
+ memcpy(pfil.Pf_Filter, pf_filter, sizeof(pf_filter));
+ /* pfmod does not support transparent ioctls */
+ sioc.ic_cmd = PFIOCSETF;
+ sioc.ic_timout = 5;
+ sioc.ic_len = sizeof(struct packetfilt);
+ sioc.ic_dp = (char *)&pfil;
+ if (ioctl(fd, I_STR, &sioc) == -1)
+ zlog_warn("%s: could not perform PF_IOCSETF on %s",
+ __func__, circuit->interface->name);
+ }
+
+ circuit->fd = fd;
+
+ return ISIS_OK;
+}
+
+/*
+ * Create the socket and set the tx/rx funcs
+ */
+int isis_sock_init(struct isis_circuit *circuit)
+{
+ int retval = ISIS_OK;
+
+ frr_with_privs(&isisd_privs) {
+
+ retval = open_dlpi_dev(circuit);
+
+ if (retval != ISIS_OK) {
+ zlog_warn("%s: could not initialize the socket",
+ __func__);
+ break;
+ }
+
+ if (circuit->circ_type == CIRCUIT_T_BROADCAST) {
+ circuit->tx = isis_send_pdu_bcast;
+ circuit->rx = isis_recv_pdu_bcast;
+ } else {
+ zlog_warn("%s: unknown circuit type", __func__);
+ retval = ISIS_WARNING;
+ break;
+ }
+ }
+
+ return retval;
+}
+
+int isis_recv_pdu_bcast(struct isis_circuit *circuit, uint8_t *ssnpa)
+{
+ struct pollfd fds[1];
+ struct strbuf ctlbuf, databuf;
+ int flags, retv;
+ dl_unitdata_ind_t *dui = (dl_unitdata_ind_t *)dlpi_ctl;
+
+ memset(fds, 0, sizeof(fds));
+ fds[0].fd = circuit->fd;
+ fds[0].events = POLLIN | POLLPRI;
+ if (poll(fds, 1, 0) <= 0)
+ return ISIS_WARNING;
+
+ memset(&ctlbuf, 0, sizeof(ctlbuf));
+ memset(&databuf, 0, sizeof(databuf));
+ ctlbuf.maxlen = sizeof(dlpi_ctl);
+ ctlbuf.buf = (void *)dlpi_ctl;
+ databuf.maxlen = sizeof(sock_buff);
+ databuf.buf = (void *)sock_buff;
+ flags = 0;
+ retv = getmsg(circuit->fd, &ctlbuf, &databuf, &flags);
+
+ if (retv < 0) {
+ zlog_warn("%s: getmsg failed: %s", __func__,
+ safe_strerror(errno));
+ return ISIS_WARNING;
+ }
+
+ if (retv & (MORECTL | MOREDATA)) {
+ while (retv & (MORECTL | MOREDATA)) {
+ flags = 0;
+ retv = getmsg(circuit->fd, &ctlbuf, &databuf, &flags);
+ }
+ return ISIS_WARNING;
+ }
+
+ if (ctlbuf.len < (ssize_t)DL_UNITDATA_IND_SIZE
+ || dui->dl_primitive != DL_UNITDATA_IND)
+ return ISIS_WARNING;
+
+ if (dui->dl_src_addr_length != ETHERADDRL + 2
+ || dui->dl_src_addr_offset < DL_UNITDATA_IND_SIZE
+ || dui->dl_src_addr_offset + dui->dl_src_addr_length
+ > (size_t)ctlbuf.len)
+ return ISIS_WARNING;
+
+ memcpy(ssnpa,
+ (char *)dui + dui->dl_src_addr_offset
+ + (circuit->sap_length > 0 ? circuit->sap_length : 0),
+ ETHERADDRL);
+
+ if (databuf.len < LLC_LEN || sock_buff[0] != ISO_SAP
+ || sock_buff[1] != ISO_SAP || sock_buff[2] != 3)
+ return ISIS_WARNING;
+
+ stream_write(circuit->rcv_stream, sock_buff + LLC_LEN,
+ databuf.len - LLC_LEN);
+ stream_set_getp(circuit->rcv_stream, 0);
+
+ return ISIS_OK;
+}
+
+int isis_send_pdu_bcast(struct isis_circuit *circuit, int level)
+{
+ dl_unitdata_req_t *dur = (dl_unitdata_req_t *)dlpi_ctl;
+ char *dstaddr;
+ unsigned short *dstsap;
+ int buflen;
+ int rv;
+
+ buflen = stream_get_endp(circuit->snd_stream) + LLC_LEN;
+ if ((size_t)buflen > sizeof(sock_buff)) {
+ zlog_warn(
+ "%s: sock_buff size %zu is less than output pdu size %d on circuit %s",
+ __func__, sizeof(sock_buff), buflen,
+ circuit->interface->name);
+ return ISIS_WARNING;
+ }
+
+ stream_set_getp(circuit->snd_stream, 0);
+
+ memset(dur, 0, sizeof(*dur));
+ dur->dl_primitive = DL_UNITDATA_REQ;
+ dur->dl_dest_addr_length = ETHERADDRL + 2;
+ dur->dl_dest_addr_offset = sizeof(*dur);
+
+ dstaddr = (char *)(dur + 1);
+ if (circuit->sap_length < 0) {
+ dstsap = (unsigned short *)(dstaddr + ETHERADDRL);
+ } else {
+ dstsap = (unsigned short *)dstaddr;
+ dstaddr += circuit->sap_length;
+ }
+ if (level == 1)
+ memcpy(dstaddr, ALL_L1_ISS, ETHERADDRL);
+ else
+ memcpy(dstaddr, ALL_L2_ISS, ETHERADDRL);
+ /* Note: DLPI SAP values are in host byte order */
+ *dstsap = buflen;
+
+ sock_buff[0] = ISO_SAP;
+ sock_buff[1] = ISO_SAP;
+ sock_buff[2] = 0x03;
+ memcpy(sock_buff + LLC_LEN, circuit->snd_stream->data,
+ stream_get_endp(circuit->snd_stream));
+ rv = dlpisend(circuit->fd, dur, sizeof(*dur) + dur->dl_dest_addr_length,
+ sock_buff, buflen, 0);
+ if (rv < 0) {
+ zlog_warn("IS-IS dlpi: could not transmit packet on %s: %s",
+ circuit->interface->name, safe_strerror(errno));
+ if (ERRNO_IO_RETRY(errno))
+ return ISIS_WARNING;
+ return ISIS_ERROR;
+ }
+
+ return ISIS_OK;
+}
+
+#endif /* ISIS_METHOD == ISIS_METHOD_DLPI */
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-21 13:48:39 +0000