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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-09 13:16:35 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-09 13:16:35 +0000
commite2bbf175a2184bd76f6c54ccf8456babeb1a46fc (patch)
treef0b76550d6e6f500ada964a3a4ee933a45e5a6f1 /pimd/pim_register.c
parentInitial commit. (diff)
downloadfrr-e2bbf175a2184bd76f6c54ccf8456babeb1a46fc.tar.xz
frr-e2bbf175a2184bd76f6c54ccf8456babeb1a46fc.zip
Adding upstream version 9.1.upstream/9.1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'pimd/pim_register.c')
-rw-r--r--pimd/pim_register.c756
1 files changed, 756 insertions, 0 deletions
diff --git a/pimd/pim_register.c b/pimd/pim_register.c
new file mode 100644
index 0000000..01da699
--- /dev/null
+++ b/pimd/pim_register.c
@@ -0,0 +1,756 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * PIM for Quagga
+ * Copyright (C) 2015 Cumulus Networks, Inc.
+ * Donald Sharp
+ */
+
+#include <zebra.h>
+
+#include "log.h"
+#include "if.h"
+#include "frrevent.h"
+#include "prefix.h"
+#include "vty.h"
+#include "plist.h"
+
+#include "pimd.h"
+#include "pim_mroute.h"
+#include "pim_iface.h"
+#include "pim_msg.h"
+#include "pim_pim.h"
+#include "pim_str.h"
+#include "pim_rp.h"
+#include "pim_register.h"
+#include "pim_upstream.h"
+#include "pim_rpf.h"
+#include "pim_oil.h"
+#include "pim_zebra.h"
+#include "pim_join.h"
+#include "pim_util.h"
+#include "pim_ssm.h"
+#include "pim_vxlan.h"
+#include "pim_addr.h"
+
+struct event *send_test_packet_timer = NULL;
+
+void pim_register_join(struct pim_upstream *up)
+{
+ struct pim_instance *pim = up->channel_oil->pim;
+
+ if (pim_is_grp_ssm(pim, up->sg.grp)) {
+ if (PIM_DEBUG_PIM_EVENTS)
+ zlog_debug("%s register setup skipped as group is SSM",
+ up->sg_str);
+ return;
+ }
+
+ pim_channel_add_oif(up->channel_oil, pim->regiface,
+ PIM_OIF_FLAG_PROTO_PIM, __func__);
+ up->reg_state = PIM_REG_JOIN;
+ pim_vxlan_update_sg_reg_state(pim, up, true);
+}
+
+void pim_register_stop_send(struct interface *ifp, pim_sgaddr *sg, pim_addr src,
+ pim_addr originator)
+{
+ struct pim_interface *pinfo;
+ unsigned char buffer[10000];
+ unsigned int b1length = 0;
+ unsigned int length;
+ uint8_t *b1;
+
+ if (PIM_DEBUG_PIM_REG) {
+ zlog_debug("Sending Register stop for %pSG to %pPA on %s", sg,
+ &originator, ifp->name);
+ }
+
+ memset(buffer, 0, 10000);
+ b1 = (uint8_t *)buffer + PIM_MSG_REGISTER_STOP_LEN;
+
+ length = pim_encode_addr_group(b1, AFI_IP, 0, 0, sg->grp);
+ b1length += length;
+ b1 += length;
+
+ length = pim_encode_addr_ucast(b1, sg->src);
+ b1length += length;
+
+ pim_msg_build_header(src, originator, buffer,
+ b1length + PIM_MSG_REGISTER_STOP_LEN,
+ PIM_MSG_TYPE_REG_STOP, false);
+
+ pinfo = (struct pim_interface *)ifp->info;
+ if (!pinfo) {
+ if (PIM_DEBUG_PIM_TRACE)
+ zlog_debug("%s: No pinfo!", __func__);
+ return;
+ }
+ if (pim_msg_send(pinfo->pim->reg_sock, src, originator, buffer,
+ b1length + PIM_MSG_REGISTER_STOP_LEN, ifp)) {
+ if (PIM_DEBUG_PIM_TRACE) {
+ zlog_debug(
+ "%s: could not send PIM register stop message on interface %s",
+ __func__, ifp->name);
+ }
+ }
+
+ if (!pinfo->pim_passive_enable)
+ ++pinfo->pim_ifstat_reg_stop_send;
+}
+
+static void pim_reg_stop_upstream(struct pim_instance *pim,
+ struct pim_upstream *up)
+{
+ switch (up->reg_state) {
+ case PIM_REG_NOINFO:
+ case PIM_REG_PRUNE:
+ return;
+ case PIM_REG_JOIN:
+ up->reg_state = PIM_REG_PRUNE;
+ pim_channel_del_oif(up->channel_oil, pim->regiface,
+ PIM_OIF_FLAG_PROTO_PIM, __func__);
+ pim_upstream_start_register_stop_timer(up, 0);
+ pim_vxlan_update_sg_reg_state(pim, up, false);
+ break;
+ case PIM_REG_JOIN_PENDING:
+ up->reg_state = PIM_REG_PRUNE;
+ pim_upstream_start_register_stop_timer(up, 0);
+ return;
+ }
+}
+
+int pim_register_stop_recv(struct interface *ifp, uint8_t *buf, int buf_size)
+{
+ struct pim_interface *pim_ifp = ifp->info;
+ struct pim_instance *pim = pim_ifp->pim;
+ struct pim_upstream *up = NULL;
+ struct pim_rpf *rp;
+ pim_sgaddr sg;
+ struct listnode *up_node;
+ struct pim_upstream *child;
+ bool wrong_af = false;
+ bool handling_star = false;
+ int l;
+
+ if (pim_ifp->pim_passive_enable) {
+ if (PIM_DEBUG_PIM_PACKETS)
+ zlog_debug(
+ "skip receiving PIM message on passive interface %s",
+ ifp->name);
+ return 0;
+ }
+
+ ++pim_ifp->pim_ifstat_reg_stop_recv;
+
+ memset(&sg, 0, sizeof(sg));
+ l = pim_parse_addr_group(&sg, buf, buf_size);
+ buf += l;
+ buf_size -= l;
+ pim_parse_addr_ucast(&sg.src, buf, buf_size, &wrong_af);
+
+ if (wrong_af) {
+ zlog_err("invalid AF in Register-Stop on %s", ifp->name);
+ return -1;
+ }
+
+
+ if (PIM_DEBUG_PIM_REG)
+ zlog_debug("Received Register stop for %pSG", &sg);
+
+ rp = RP(pim_ifp->pim, sg.grp);
+ if (rp) {
+ /* As per RFC 7761, Section 4.9.4:
+ * A special wildcard value consisting of an address field of
+ * all zeros can be used to indicate any source.
+ */
+ if ((pim_addr_cmp(sg.src, rp->rpf_addr) == 0) ||
+ pim_addr_is_any(sg.src)) {
+ handling_star = true;
+ sg.src = PIMADDR_ANY;
+ }
+ }
+
+ /*
+ * RFC 7761 Sec 4.4.1
+ * Handling Register-Stop(*,G) Messages at the DR:
+ * A Register-Stop(*,G) should be treated as a
+ * Register-Stop(S,G) for all (S,G) Register state
+ * machines that are not in the NoInfo state.
+ */
+ up = pim_upstream_find(pim, &sg);
+ if (up) {
+ /*
+ * If the upstream find actually found a particular
+ * S,G then we *know* that the following for loop
+ * is not going to execute and this is ok
+ */
+ for (ALL_LIST_ELEMENTS_RO(up->sources, up_node, child)) {
+ if (PIM_DEBUG_PIM_REG)
+ zlog_debug("Executing Reg stop for %s",
+ child->sg_str);
+
+ pim_reg_stop_upstream(pim, child);
+ }
+
+ if (PIM_DEBUG_PIM_REG)
+ zlog_debug("Executing Reg stop for %s", up->sg_str);
+ pim_reg_stop_upstream(pim, up);
+ } else {
+ if (!handling_star)
+ return 0;
+ /*
+ * Unfortunately pim was unable to find a *,G
+ * but pim may still actually have individual
+ * S,G's that need to be processed. In that
+ * case pim must do the expensive walk to find
+ * and stop
+ */
+ frr_each (rb_pim_upstream, &pim->upstream_head, up) {
+ if (pim_addr_cmp(up->sg.grp, sg.grp) == 0) {
+ if (PIM_DEBUG_PIM_REG)
+ zlog_debug("Executing Reg stop for %s",
+ up->sg_str);
+ pim_reg_stop_upstream(pim, up);
+ }
+ }
+ }
+
+ return 0;
+}
+
+#if PIM_IPV == 6
+struct in6_addr pim_register_get_unicast_v6_addr(struct pim_interface *p_ifp)
+{
+ struct listnode *node;
+ struct listnode *nextnode;
+ struct pim_secondary_addr *sec_addr;
+ struct pim_interface *pim_ifp;
+ struct interface *ifp;
+ struct pim_instance *pim = p_ifp->pim;
+
+ /* Trying to get the unicast address from the RPF interface first */
+ for (ALL_LIST_ELEMENTS(p_ifp->sec_addr_list, node, nextnode,
+ sec_addr)) {
+ if (!is_ipv6_global_unicast(&sec_addr->addr.u.prefix6))
+ continue;
+
+ return sec_addr->addr.u.prefix6;
+ }
+
+ /* Loop through all the pim interface and try to return a global
+ * unicast ipv6 address
+ */
+ FOR_ALL_INTERFACES (pim->vrf, ifp) {
+ pim_ifp = ifp->info;
+
+ if (!pim_ifp)
+ continue;
+
+ for (ALL_LIST_ELEMENTS(pim_ifp->sec_addr_list, node, nextnode,
+ sec_addr)) {
+ if (!is_ipv6_global_unicast(&sec_addr->addr.u.prefix6))
+ continue;
+
+ return sec_addr->addr.u.prefix6;
+ }
+ }
+
+ zlog_warn("No global address found for use to send register message");
+ return PIMADDR_ANY;
+}
+#endif
+
+void pim_register_send(const uint8_t *buf, int buf_size, pim_addr src,
+ struct pim_rpf *rpg, int null_register,
+ struct pim_upstream *up)
+{
+ unsigned char buffer[10000];
+ unsigned char *b1;
+ struct pim_interface *pinfo;
+ struct interface *ifp;
+
+ if (PIM_DEBUG_PIM_REG) {
+ zlog_debug("Sending %s %sRegister Packet to %pPA", up->sg_str,
+ null_register ? "NULL " : "", &rpg->rpf_addr);
+ }
+
+ ifp = rpg->source_nexthop.interface;
+ if (!ifp) {
+ if (PIM_DEBUG_PIM_REG)
+ zlog_debug("%s: No interface to transmit register on",
+ __func__);
+ return;
+ }
+ pinfo = (struct pim_interface *)ifp->info;
+ if (!pinfo) {
+ if (PIM_DEBUG_PIM_REG)
+ zlog_debug(
+ "%s: Interface: %s not configured for pim to transmit on!",
+ __func__, ifp->name);
+ return;
+ }
+
+ if (PIM_DEBUG_PIM_REG) {
+ zlog_debug("%s: Sending %s %sRegister Packet to %pPA on %s",
+ __func__, up->sg_str, null_register ? "NULL " : "",
+ &rpg->rpf_addr, ifp->name);
+ }
+
+ memset(buffer, 0, 10000);
+ b1 = buffer + PIM_MSG_HEADER_LEN;
+ *b1 |= null_register << 6;
+ b1 = buffer + PIM_MSG_REGISTER_LEN;
+
+ memcpy(b1, (const unsigned char *)buf, buf_size);
+
+#if PIM_IPV == 6
+ /* While sending Register message to RP, we cannot use link-local
+ * address therefore using unicast ipv6 address here, choosing it
+ * from the RPF Interface
+ */
+ src = pim_register_get_unicast_v6_addr(pinfo);
+#endif
+ pim_msg_build_header(src, rpg->rpf_addr, buffer,
+ buf_size + PIM_MSG_REGISTER_LEN,
+ PIM_MSG_TYPE_REGISTER, false);
+
+ if (!pinfo->pim_passive_enable)
+ ++pinfo->pim_ifstat_reg_send;
+
+ if (pim_msg_send(pinfo->pim->reg_sock, src, rpg->rpf_addr, buffer,
+ buf_size + PIM_MSG_REGISTER_LEN, ifp)) {
+ if (PIM_DEBUG_PIM_TRACE) {
+ zlog_debug(
+ "%s: could not send PIM register message on interface %s",
+ __func__, ifp->name);
+ }
+ return;
+ }
+}
+
+#if PIM_IPV == 4
+void pim_null_register_send(struct pim_upstream *up)
+{
+ struct ip ip_hdr;
+ struct pim_interface *pim_ifp;
+ struct pim_rpf *rpg;
+ pim_addr src;
+
+ pim_ifp = up->rpf.source_nexthop.interface->info;
+ if (!pim_ifp) {
+ if (PIM_DEBUG_PIM_TRACE)
+ zlog_debug(
+ "%s: Cannot send null-register for %s no valid iif",
+ __func__, up->sg_str);
+ return;
+ }
+
+ rpg = RP(pim_ifp->pim, up->sg.grp);
+ if (!rpg) {
+ if (PIM_DEBUG_PIM_TRACE)
+ zlog_debug(
+ "%s: Cannot send null-register for %s no RPF to the RP",
+ __func__, up->sg_str);
+ return;
+ }
+
+ memset(&ip_hdr, 0, sizeof(ip_hdr));
+ ip_hdr.ip_p = PIM_IP_PROTO_PIM;
+ ip_hdr.ip_hl = 5;
+ ip_hdr.ip_v = 4;
+ ip_hdr.ip_src = up->sg.src;
+ ip_hdr.ip_dst = up->sg.grp;
+ ip_hdr.ip_len = htons(20);
+
+ /* checksum is broken */
+ src = pim_ifp->primary_address;
+ if (PIM_UPSTREAM_FLAG_TEST_SRC_VXLAN_ORIG(up->flags)) {
+ if (!pim_vxlan_get_register_src(pim_ifp->pim, up, &src)) {
+ if (PIM_DEBUG_PIM_TRACE)
+ zlog_debug(
+ "%s: Cannot send null-register for %s vxlan-aa PIP unavailable",
+ __func__, up->sg_str);
+ return;
+ }
+ }
+ pim_register_send((uint8_t *)&ip_hdr, sizeof(struct ip), src, rpg, 1,
+ up);
+}
+#else
+void pim_null_register_send(struct pim_upstream *up)
+{
+ struct ip6_hdr ip6_hdr;
+ struct pim_msg_header pim_msg_header;
+ struct pim_interface *pim_ifp;
+ struct pim_rpf *rpg;
+ pim_addr src;
+ unsigned char buffer[sizeof(ip6_hdr) + sizeof(pim_msg_header)];
+ struct ipv6_ph ph;
+
+ pim_ifp = up->rpf.source_nexthop.interface->info;
+ if (!pim_ifp) {
+ if (PIM_DEBUG_PIM_TRACE)
+ zlog_debug(
+ "Cannot send null-register for %s no valid iif",
+ up->sg_str);
+ return;
+ }
+
+ rpg = RP(pim_ifp->pim, up->sg.grp);
+ if (!rpg) {
+ if (PIM_DEBUG_PIM_TRACE)
+ zlog_debug(
+ "Cannot send null-register for %s no RPF to the RP",
+ up->sg_str);
+ return;
+ }
+
+ memset(&ip6_hdr, 0, sizeof(ip6_hdr));
+ ip6_hdr.ip6_nxt = PIM_IP_PROTO_PIM;
+ ip6_hdr.ip6_plen = PIM_MSG_HEADER_LEN;
+ ip6_hdr.ip6_vfc = 6 << 4;
+ ip6_hdr.ip6_hlim = MAXTTL;
+ ip6_hdr.ip6_src = up->sg.src;
+ ip6_hdr.ip6_dst = up->sg.grp;
+
+ memset(buffer, 0, (sizeof(ip6_hdr) + sizeof(pim_msg_header)));
+ memcpy(buffer, &ip6_hdr, sizeof(ip6_hdr));
+
+ memset(&pim_msg_header, 0, sizeof(pim_msg_header));
+ memset(&ph, 0, sizeof(ph));
+
+ ph.src = up->sg.src;
+ ph.dst = up->sg.grp;
+ ph.ulpl = htonl(PIM_MSG_HEADER_LEN);
+ ph.next_hdr = IPPROTO_PIM;
+ pim_msg_header.checksum =
+ in_cksum_with_ph6(&ph, &pim_msg_header, PIM_MSG_HEADER_LEN);
+
+ memcpy(buffer + sizeof(ip6_hdr), &pim_msg_header, PIM_MSG_HEADER_LEN);
+
+
+ src = pim_ifp->primary_address;
+ pim_register_send((uint8_t *)buffer,
+ sizeof(ip6_hdr) + PIM_MSG_HEADER_LEN, src, rpg, 1,
+ up);
+}
+#endif
+
+/*
+ * 4.4.2 Receiving Register Messages at the RP
+ *
+ * When an RP receives a Register message, the course of action is
+ * decided according to the following pseudocode:
+ *
+ * packet_arrives_on_rp_tunnel( pkt ) {
+ * if( outer.dst is not one of my addresses ) {
+ * drop the packet silently.
+ * # Note: this may be a spoofing attempt
+ * }
+ * if( I_am_RP(G) AND outer.dst == RP(G) ) {
+ * sentRegisterStop = false;
+ * if ( register.borderbit == true ) {
+ * if ( PMBR(S,G) == unknown ) {
+ * PMBR(S,G) = outer.src
+ * } else if ( outer.src != PMBR(S,G) ) {
+ * send Register-Stop(S,G) to outer.src
+ * drop the packet silently.
+ * }
+ * }
+ * if ( SPTbit(S,G) OR
+ * ( SwitchToSptDesired(S,G) AND
+ * ( inherited_olist(S,G) == NULL ))) {
+ * send Register-Stop(S,G) to outer.src
+ * sentRegisterStop = true;
+ * }
+ * if ( SPTbit(S,G) OR SwitchToSptDesired(S,G) ) {
+ * if ( sentRegisterStop == true ) {
+ * set KeepaliveTimer(S,G) to RP_Keepalive_Period;
+ * } else {
+ * set KeepaliveTimer(S,G) to Keepalive_Period;
+ * }
+ * }
+ * if( !SPTbit(S,G) AND ! pkt.NullRegisterBit ) {
+ * decapsulate and forward the inner packet to
+ * inherited_olist(S,G,rpt) # Note (+)
+ * }
+ * } else {
+ * send Register-Stop(S,G) to outer.src
+ * # Note (*)
+ * }
+ * }
+ */
+int pim_register_recv(struct interface *ifp, pim_addr dest_addr,
+ pim_addr src_addr, uint8_t *tlv_buf, int tlv_buf_size)
+{
+ int sentRegisterStop = 0;
+ const void *ip_hdr;
+ pim_sgaddr sg;
+ uint32_t *bits;
+ int i_am_rp = 0;
+ struct pim_interface *pim_ifp = ifp->info;
+ struct pim_instance *pim = pim_ifp->pim;
+ pim_addr rp_addr;
+ struct pim_rpf *rpg;
+
+ if (pim_ifp->pim_passive_enable) {
+ if (PIM_DEBUG_PIM_PACKETS)
+ zlog_debug(
+ "skip receiving PIM message on passive interface %s",
+ ifp->name);
+ return 0;
+ }
+
+#define PIM_MSG_REGISTER_BIT_RESERVED_LEN 4
+ ip_hdr = (tlv_buf + PIM_MSG_REGISTER_BIT_RESERVED_LEN);
+
+ if (!if_address_is_local(&dest_addr, PIM_AF, pim->vrf->vrf_id)) {
+ if (PIM_DEBUG_PIM_REG)
+ zlog_debug(
+ "%s: Received Register message for destination address: %pPA that I do not own",
+ __func__, &dest_addr);
+ return 0;
+ }
+
+ ++pim_ifp->pim_ifstat_reg_recv;
+
+ /*
+ * Please note this is not drawn to get the correct bit/data size
+ *
+ * The entirety of the REGISTER packet looks like this:
+ * -------------------------------------------------------------
+ * | Ver | Type | Reserved | Checksum |
+ * |-----------------------------------------------------------|
+ * |B|N| Reserved 2 |
+ * |-----------------------------------------------------------|
+ * | Encap | IP HDR |
+ * | Mcast | |
+ * | Packet |--------------------------------------------------|
+ * | | Mcast Data |
+ * | | |
+ * ...
+ *
+ * tlv_buf when received from the caller points at the B bit
+ * We need to know the inner source and dest
+ */
+ bits = (uint32_t *)tlv_buf;
+
+ /*
+ * tlv_buf points to the start of the |B|N|... Reserved
+ * Line above. So we need to add 4 bytes to get to the
+ * start of the actual Encapsulated data.
+ */
+ memset(&sg, 0, sizeof(sg));
+ sg = pim_sgaddr_from_iphdr(ip_hdr);
+
+#if PIM_IPV == 6
+ /*
+ * According to RFC section 4.9.3, If Dummy PIM Header is included
+ * in NULL Register as a payload there would be two PIM headers.
+ * The inner PIM Header's checksum field should also be validated
+ * in addition to the outer PIM Header's checksum. Validation of
+ * inner PIM header checksum is done here.
+ */
+ if ((*bits & PIM_REGISTER_NR_BIT) &&
+ ((tlv_buf_size - PIM_MSG_REGISTER_BIT_RESERVED_LEN) >
+ (int)sizeof(struct ip6_hdr))) {
+ uint16_t computed_checksum;
+ uint16_t received_checksum;
+ struct ipv6_ph ph;
+ struct pim_msg_header *header;
+
+ header = (struct pim_msg_header
+ *)(tlv_buf +
+ PIM_MSG_REGISTER_BIT_RESERVED_LEN +
+ sizeof(struct ip6_hdr));
+ ph.src = sg.src;
+ ph.dst = sg.grp;
+ ph.ulpl = htonl(PIM_MSG_HEADER_LEN);
+ ph.next_hdr = IPPROTO_PIM;
+
+ received_checksum = header->checksum;
+
+ header->checksum = 0;
+ computed_checksum = in_cksum_with_ph6(
+ &ph, header, htonl(PIM_MSG_HEADER_LEN));
+
+ if (computed_checksum != received_checksum) {
+ if (PIM_DEBUG_PIM_PACKETS)
+ zlog_debug(
+ "Ignoring Null Register message%pSG from %pPA due to bad checksum in Encapsulated dummy PIM header",
+ &sg, &src_addr);
+ return 0;
+ }
+ }
+#endif
+ i_am_rp = I_am_RP(pim, sg.grp);
+
+ if (PIM_DEBUG_PIM_REG)
+ zlog_debug(
+ "Received Register message%pSG from %pPA on %s, rp: %d",
+ &sg, &src_addr, ifp->name, i_am_rp);
+
+ if (pim_is_grp_ssm(pim_ifp->pim, sg.grp)) {
+ if (pim_addr_is_any(sg.src)) {
+ zlog_warn(
+ "%s: Received Register message for Group(%pPA) is now in SSM, dropping the packet",
+ __func__, &sg.grp);
+ /* Drop Packet Silently */
+ return 0;
+ }
+ }
+
+ rpg = RP(pim, sg.grp);
+ if (!rpg) {
+ zlog_warn("%s: Received Register Message %pSG from %pPA on %s where the RP could not be looked up",
+ __func__, &sg, &src_addr, ifp->name);
+ return 0;
+ }
+
+ rp_addr = rpg->rpf_addr;
+ if (i_am_rp && (!pim_addr_cmp(dest_addr, rp_addr))) {
+ sentRegisterStop = 0;
+
+ if (pim->register_plist) {
+ struct prefix_list *plist;
+ struct prefix src;
+
+ plist = prefix_list_lookup(PIM_AFI,
+ pim->register_plist);
+
+ pim_addr_to_prefix(&src, sg.src);
+
+ if (prefix_list_apply_ext(plist, NULL, &src, true) ==
+ PREFIX_DENY) {
+ pim_register_stop_send(ifp, &sg, dest_addr,
+ src_addr);
+ if (PIM_DEBUG_PIM_PACKETS)
+ zlog_debug(
+ "%s: Sending register-stop to %pPA for %pSG due to prefix-list denial, dropping packet",
+ __func__, &src_addr, &sg);
+
+ return 0;
+ }
+ }
+
+ if (*bits & PIM_REGISTER_BORDER_BIT) {
+ if (PIM_DEBUG_PIM_PACKETS)
+ zlog_debug(
+ "%s: Received Register message with Border bit set, ignoring",
+ __func__);
+
+ /* Drop Packet Silently */
+ return 0;
+ }
+
+ struct pim_upstream *upstream = pim_upstream_find(pim, &sg);
+ /*
+ * If we don't have a place to send ignore the packet
+ */
+ if (!upstream) {
+ upstream = pim_upstream_add(
+ pim, &sg, ifp,
+ PIM_UPSTREAM_FLAG_MASK_SRC_STREAM, __func__,
+ NULL);
+ if (!upstream) {
+ zlog_warn("Failure to create upstream state");
+ return 1;
+ }
+
+ upstream->upstream_register = src_addr;
+ } else {
+ /*
+ * If the FHR has set a very very fast register timer
+ * there exists a possibility that the incoming NULL
+ * register
+ * is happening before we set the spt bit. If so
+ * Do a quick check to update the counters and
+ * then set the spt bit as appropriate
+ */
+ if (upstream->sptbit != PIM_UPSTREAM_SPTBIT_TRUE) {
+ pim_mroute_update_counters(
+ upstream->channel_oil);
+ /*
+ * Have we seen packets?
+ */
+ if (upstream->channel_oil->cc.oldpktcnt
+ < upstream->channel_oil->cc.pktcnt)
+ pim_upstream_set_sptbit(
+ upstream,
+ upstream->rpf.source_nexthop
+ .interface);
+ }
+ }
+
+ if ((upstream->sptbit == PIM_UPSTREAM_SPTBIT_TRUE)
+ || ((SwitchToSptDesiredOnRp(pim, &sg))
+ && pim_upstream_inherited_olist(pim, upstream) == 0)) {
+ pim_register_stop_send(ifp, &sg, dest_addr, src_addr);
+ sentRegisterStop = 1;
+ } else {
+ if (PIM_DEBUG_PIM_REG)
+ zlog_debug("(%s) sptbit: %d", upstream->sg_str,
+ upstream->sptbit);
+ }
+ if ((upstream->sptbit == PIM_UPSTREAM_SPTBIT_TRUE)
+ || (SwitchToSptDesiredOnRp(pim, &sg))) {
+ if (sentRegisterStop) {
+ pim_upstream_keep_alive_timer_start(
+ upstream, pim->rp_keep_alive_time);
+ } else {
+ pim_upstream_keep_alive_timer_start(
+ upstream, pim->keep_alive_time);
+ }
+ }
+
+ if (!(upstream->sptbit == PIM_UPSTREAM_SPTBIT_TRUE)
+ && !(*bits & PIM_REGISTER_NR_BIT)) {
+ // decapsulate and forward the iner packet to
+ // inherited_olist(S,G,rpt)
+ // This is taken care of by the kernel for us
+ }
+ pim_upstream_msdp_reg_timer_start(upstream);
+ } else {
+ if (PIM_DEBUG_PIM_REG) {
+ if (!i_am_rp)
+ zlog_debug("Received Register packet for %pSG, Rejecting packet because I am not the RP configured for group",
+ &sg);
+ else
+ zlog_debug("Received Register packet for %pSG, Rejecting packet because the dst ip address is not the actual RP",
+ &sg);
+ }
+ pim_register_stop_send(ifp, &sg, dest_addr, src_addr);
+ }
+
+ return 0;
+}
+
+/*
+ * This routine scan all upstream and update register state and remove pimreg
+ * when couldreg becomes false.
+ */
+void pim_reg_del_on_couldreg_fail(struct interface *ifp)
+{
+ struct pim_interface *pim_ifp = ifp->info;
+ struct pim_instance *pim;
+ struct pim_upstream *up;
+
+ if (!pim_ifp)
+ return;
+
+ pim = pim_ifp->pim;
+
+ frr_each (rb_pim_upstream, &pim->upstream_head, up) {
+ if (ifp != up->rpf.source_nexthop.interface)
+ continue;
+
+ if (!pim_upstream_could_register(up)
+ && (up->reg_state != PIM_REG_NOINFO)) {
+ pim_channel_del_oif(up->channel_oil, pim->regiface,
+ PIM_OIF_FLAG_PROTO_PIM, __func__);
+ EVENT_OFF(up->t_rs_timer);
+ up->reg_state = PIM_REG_NOINFO;
+ PIM_UPSTREAM_FLAG_UNSET_FHR(up->flags);
+ }
+ }
+}