forked from Mirror/frr
pimd: MSDP SA filtering
Implement MSDP peer incoming/outgoing SA filter. Note ---- Cisco extended access list has a special meaning: the first address is the source address to filter. Example: ! The rules below filter some LAN prefix to be leaked out access-list filter-lan-source deny ip 192.168.0.0 0.0.255.255 224.0.0.0 0.255.255.255 access-list filter-lan-source permit any router pim msdp peer 192.168.0.1 sa-filter filter-lan-source out ! The rules below filter some special management group from being ! learned access-list filter-management-group deny 230.0.0.0 0.255.255.255 access-list filter-management-group permit any router pim msdp peer 192.168.0.1 sa-filter filter-management-group in Signed-off-by: Rafael Zalamena <rzalamena@opensourcerouting.org>
This commit is contained in:
Rafael Zalamena
parent
bfae003b62
commit
be3bfe5daa
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@ -6486,6 +6486,69 @@ DEFPY_ATTR(no_ip_pim_msdp_peer,
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return ret;
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}
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DEFPY(msdp_peer_sa_filter, msdp_peer_sa_filter_cmd,
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"msdp peer A.B.C.D$peer sa-filter ACL_NAME$acl_name <in|out>$dir",
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CFG_MSDP_STR
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"Configure MSDP peer\n"
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"MSDP Peer address\n"
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"SA access-list filter\n"
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"SA access-list name\n"
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"Filter incoming SAs\n"
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"Filter outgoing SAs\n")
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{
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const struct lyd_node *peer_node;
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char xpath[XPATH_MAXLEN + 24];
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snprintf(xpath, sizeof(xpath), "%s/msdp-peer[peer-ip='%s']",
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VTY_CURR_XPATH, peer_str);
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peer_node = yang_dnode_get(vty->candidate_config->dnode, xpath);
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if (peer_node == NULL) {
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vty_out(vty, "%% MSDP peer %s not yet configured\n", peer_str);
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return CMD_SUCCESS;
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}
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if (strcmp(dir, "in") == 0)
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nb_cli_enqueue_change(vty, "./sa-filter-in", NB_OP_MODIFY,
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acl_name);
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else
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nb_cli_enqueue_change(vty, "./sa-filter-out", NB_OP_MODIFY,
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acl_name);
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return nb_cli_apply_changes(vty, "%s", xpath);
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}
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DEFPY(no_msdp_peer_sa_filter, no_ip_msdp_peer_sa_filter_cmd,
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"no msdp peer A.B.C.D$peer sa-filter ACL_NAME <in|out>$dir",
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NO_STR
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CFG_MSDP_STR
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"Configure MSDP peer\n"
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"MSDP Peer address\n"
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"SA access-list filter\n"
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"SA access-list name\n"
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"Filter incoming SAs\n"
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"Filter outgoing SAs\n")
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{
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const struct lyd_node *peer_node;
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char xpath[XPATH_MAXLEN + 24];
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snprintf(xpath, sizeof(xpath), "%s/msdp-peer[peer-ip='%s']",
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VTY_CURR_XPATH, peer_str);
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peer_node = yang_dnode_get(vty->candidate_config->dnode, xpath);
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if (peer_node == NULL) {
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vty_out(vty, "%% MSDP peer %s not yet configured\n", peer_str);
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return CMD_SUCCESS;
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}
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if (strcmp(dir, "in") == 0)
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nb_cli_enqueue_change(vty, "./sa-filter-in", NB_OP_DESTROY,
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NULL);
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else
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nb_cli_enqueue_change(vty, "./sa-filter-out", NB_OP_DESTROY,
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NULL);
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return nb_cli_apply_changes(vty, "%s", xpath);
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}
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DEFPY(pim_msdp_mesh_group_member,
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pim_msdp_mesh_group_member_cmd,
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"msdp mesh-group WORD$gname member A.B.C.D$maddr",
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@ -8259,6 +8322,8 @@ void pim_cmd_init(void)
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install_element(PIM_NODE, &no_pim_msdp_peer_cmd);
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install_element(PIM_NODE, &pim_msdp_timers_cmd);
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install_element(PIM_NODE, &no_pim_msdp_timers_cmd);
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install_element(PIM_NODE, &msdp_peer_sa_filter_cmd);
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install_element(PIM_NODE, &no_ip_msdp_peer_sa_filter_cmd);
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install_element(PIM_NODE, &pim_msdp_mesh_group_member_cmd);
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install_element(PIM_NODE, &no_pim_msdp_mesh_group_member_cmd);
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install_element(PIM_NODE, &pim_msdp_mesh_group_source_cmd);
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@ -1317,6 +1317,15 @@ bool pim_msdp_peer_config_write(struct vty *vty, struct pim_instance *pim)
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vty_out(vty, " msdp peer %pI4 source %pI4\n", &mp->peer,
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&mp->local);
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if (mp->acl_in)
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vty_out(vty, " msdp peer %pI4 sa-filter %s in\n",
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&mp->peer, mp->acl_in);
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if (mp->acl_out)
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vty_out(vty, " msdp peer %pI4 sa-filter %s out\n",
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&mp->peer, mp->acl_out);
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written = true;
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}
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@ -138,6 +138,11 @@ struct pim_msdp_peer {
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/* timestamps */
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int64_t uptime;
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/** SA input access list name. */
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char *acl_in;
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/** SA output access list name. */
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char *acl_out;
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};
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struct pim_msdp_mg_mbr {
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@ -6,7 +6,9 @@
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#include <zebra.h>
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#include <lib/log.h>
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#include <lib/filter.h>
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#include <lib/network.h>
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#include <lib/prefix.h>
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#include <lib/stream.h>
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#include "frrevent.h"
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#include <lib/vty.h>
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@ -322,8 +324,8 @@ void pim_msdp_pkt_ka_tx(struct pim_msdp_peer *mp)
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pim_msdp_pkt_send(mp, s);
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}
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static void pim_msdp_pkt_sa_push_to_one_peer(struct pim_instance *pim,
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struct pim_msdp_peer *mp)
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static void pim_msdp_pkt_sa_push(struct pim_instance *pim,
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struct pim_msdp_peer *mp)
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{
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struct stream *s;
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@ -338,25 +340,6 @@ static void pim_msdp_pkt_sa_push_to_one_peer(struct pim_instance *pim,
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}
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}
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/* push the stream into the obuf fifo of all the peers */
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static void pim_msdp_pkt_sa_push(struct pim_instance *pim,
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struct pim_msdp_peer *mp)
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{
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struct listnode *mpnode;
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if (mp) {
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pim_msdp_pkt_sa_push_to_one_peer(pim, mp);
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} else {
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for (ALL_LIST_ELEMENTS_RO(pim->msdp.peer_list, mpnode, mp)) {
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if (PIM_DEBUG_MSDP_INTERNAL) {
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zlog_debug("MSDP peer %s pim_msdp_pkt_sa_push",
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mp->key_str);
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}
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pim_msdp_pkt_sa_push_to_one_peer(pim, mp);
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}
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}
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}
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static int pim_msdp_pkt_sa_fill_hdr(struct pim_instance *pim, int local_cnt,
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struct in_addr rp)
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{
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@ -384,6 +367,90 @@ static void pim_msdp_pkt_sa_fill_one(struct pim_msdp_sa *sa)
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stream_put_ipv4(sa->pim->msdp.work_obuf, sa->sg.src.s_addr);
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}
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static bool msdp_cisco_match(const struct filter *filter,
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const struct in_addr *source,
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const struct in_addr *group)
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{
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const struct filter_cisco *cfilter = &filter->u.cfilter;
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uint32_t source_addr;
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uint32_t group_addr;
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group_addr = group->s_addr & ~cfilter->mask_mask.s_addr;
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if (cfilter->extended) {
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source_addr = source->s_addr & ~cfilter->addr_mask.s_addr;
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if (group_addr == cfilter->mask.s_addr &&
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source_addr == cfilter->addr.s_addr)
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return true;
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} else if (group_addr == cfilter->addr.s_addr)
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return true;
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return false;
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}
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static enum filter_type msdp_access_list_apply(struct access_list *access,
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const struct in_addr *source,
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const struct in_addr *group)
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{
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struct filter *filter;
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struct prefix group_prefix;
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if (access == NULL)
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return FILTER_DENY;
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for (filter = access->head; filter; filter = filter->next) {
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if (filter->cisco) {
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if (msdp_cisco_match(filter, source, group))
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return filter->type;
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} else {
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group_prefix.family = AF_INET;
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group_prefix.prefixlen = IPV4_MAX_BITLEN;
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group_prefix.u.prefix4.s_addr = group->s_addr;
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if (access_list_apply(access, &group_prefix))
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return filter->type;
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}
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}
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return FILTER_DENY;
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}
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bool msdp_peer_sa_filter(const struct pim_msdp_peer *mp,
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const struct pim_msdp_sa *sa)
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{
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struct access_list *acl;
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/* No output filter configured, just quit. */
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if (mp->acl_out == NULL)
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return false;
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/* Find access list and test it. */
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acl = access_list_lookup(AFI_IP, mp->acl_out);
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if (msdp_access_list_apply(acl, &sa->sg.src, &sa->sg.grp) == FILTER_DENY)
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return true;
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return false;
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}
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/** Count the number of SAs to be sent for a specific peer. */
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static size_t pim_msdp_peer_sa_count(const struct pim_instance *pim,
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const struct pim_msdp_peer *peer)
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{
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const struct pim_msdp_sa *sa;
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const struct listnode *node;
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size_t sa_count = 0;
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for (ALL_LIST_ELEMENTS_RO(pim->msdp.sa_list, node, sa)) {
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if (!CHECK_FLAG(sa->flags, PIM_MSDP_SAF_LOCAL))
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continue;
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if (msdp_peer_sa_filter(peer, sa))
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continue;
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sa_count++;
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}
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return sa_count;
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}
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static void pim_msdp_pkt_sa_gen(struct pim_instance *pim,
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struct pim_msdp_peer *mp)
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{
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@ -393,7 +460,7 @@ static void pim_msdp_pkt_sa_gen(struct pim_instance *pim,
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struct prefix group_all;
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struct in_addr rp;
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int sa_count;
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int local_cnt = pim->msdp.local_cnt;
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int local_cnt = pim_msdp_peer_sa_count(pim, mp);
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sa_count = 0;
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if (PIM_DEBUG_MSDP_INTERNAL) {
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@ -418,6 +485,15 @@ static void pim_msdp_pkt_sa_gen(struct pim_instance *pim,
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* peers */
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continue;
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}
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if (msdp_peer_sa_filter(mp, sa)) {
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if (PIM_DEBUG_MSDP_EVENTS)
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zlog_debug("MSDP peer %pI4 filter SA out %s",
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&mp->peer, sa->sg_str);
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continue;
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}
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/* add sa into scratch pad */
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pim_msdp_pkt_sa_fill_one(sa);
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++sa_count;
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@ -457,15 +533,32 @@ static void pim_msdp_pkt_sa_tx_done(struct pim_instance *pim)
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void pim_msdp_pkt_sa_tx(struct pim_instance *pim)
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{
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pim_msdp_pkt_sa_gen(pim, NULL /* mp */);
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struct pim_msdp_peer *mp;
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struct listnode *node;
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for (ALL_LIST_ELEMENTS_RO(pim->msdp.peer_list, node, mp))
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pim_msdp_pkt_sa_gen(pim, mp);
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pim_msdp_pkt_sa_tx_done(pim);
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}
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void pim_msdp_pkt_sa_tx_one(struct pim_msdp_sa *sa)
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{
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struct pim_msdp_peer *mp;
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struct listnode *node;
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pim_msdp_pkt_sa_fill_hdr(sa->pim, 1 /* cnt */, sa->rp);
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pim_msdp_pkt_sa_fill_one(sa);
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pim_msdp_pkt_sa_push(sa->pim, NULL);
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for (ALL_LIST_ELEMENTS_RO(sa->pim->msdp.peer_list, node, mp)) {
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if (msdp_peer_sa_filter(mp, sa)) {
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if (PIM_DEBUG_MSDP_EVENTS)
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zlog_debug("MSDP peer %pI4 filter SA out %s",
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&mp->peer, sa->sg_str);
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continue;
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}
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pim_msdp_pkt_sa_push(sa->pim, mp);
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}
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pim_msdp_pkt_sa_tx_done(sa->pim);
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}
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@ -487,6 +580,15 @@ void pim_msdp_pkt_sa_tx_one_to_one_peer(struct pim_msdp_peer *mp,
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/* Fills the message contents. */
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sa.pim = mp->pim;
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sa.sg = sg;
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/* Don't push it if filtered. */
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if (msdp_peer_sa_filter(mp, &sa)) {
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if (PIM_DEBUG_MSDP_EVENTS)
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zlog_debug("MSDP peer %pI4 filter SA out (%pI4, %pI4)",
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&mp->peer, &sa.sg.src, &sa.sg.grp);
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return;
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}
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pim_msdp_pkt_sa_fill_one(&sa);
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/* Pushes the message. */
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@ -511,6 +613,7 @@ static void pim_msdp_pkt_ka_rx(struct pim_msdp_peer *mp, int len)
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static void pim_msdp_pkt_sa_rx_one(struct pim_msdp_peer *mp, struct in_addr rp)
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{
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struct access_list *acl;
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int prefix_len;
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pim_sgaddr sg;
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struct listnode *peer_node;
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@ -534,6 +637,19 @@ static void pim_msdp_pkt_sa_rx_one(struct pim_msdp_peer *mp, struct in_addr rp)
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if (PIM_DEBUG_MSDP_PACKETS) {
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zlog_debug(" sg %pSG", &sg);
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}
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/* Filter incoming SA with configured access list. */
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if (mp->acl_in) {
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acl = access_list_lookup(AFI_IP, mp->acl_in);
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if (msdp_access_list_apply(acl, &sg.src, &sg.grp) ==
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FILTER_DENY) {
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if (PIM_DEBUG_MSDP_EVENTS)
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zlog_debug("MSDP peer %pI4 filter SA in (%pI4, %pI4)",
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&mp->peer, &sg.src, &sg.grp);
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return;
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}
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}
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pim_msdp_sa_ref(mp->pim, mp, &sg, rp);
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/* Forwards the SA to the peers that are not in the RPF to the RP nor in
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@ -57,5 +57,7 @@ void pim_msdp_pkt_sa_tx_one(struct pim_msdp_sa *sa);
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void pim_msdp_pkt_sa_tx_to_one_peer(struct pim_msdp_peer *mp);
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void pim_msdp_pkt_sa_tx_one_to_one_peer(struct pim_msdp_peer *mp,
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struct in_addr rp, pim_sgaddr sg);
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bool msdp_peer_sa_filter(const struct pim_msdp_peer *mp,
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const struct pim_msdp_sa *sa);
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#endif
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@ -163,6 +163,20 @@ const struct frr_yang_module_info frr_pim_info = {
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.modify = routing_control_plane_protocols_control_plane_protocol_pim_address_family_msdp_peer_source_ip_modify,
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}
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},
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{
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.xpath = "/frr-routing:routing/control-plane-protocols/control-plane-protocol/frr-pim:pim/address-family/msdp-peer/sa-filter-in",
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.cbs = {
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.modify = pim_msdp_peer_sa_filter_in_modify,
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.destroy = pim_msdp_peer_sa_filter_in_destroy,
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}
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},
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{
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.xpath = "/frr-routing:routing/control-plane-protocols/control-plane-protocol/frr-pim:pim/address-family/msdp-peer/sa-filter-out",
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.cbs = {
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.modify = pim_msdp_peer_sa_filter_out_modify,
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.destroy = pim_msdp_peer_sa_filter_out_destroy,
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}
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},
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{
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.xpath = "/frr-routing:routing/control-plane-protocols/control-plane-protocol/frr-pim:pim/address-family/mlag",
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.cbs = {
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@ -65,6 +65,10 @@ int routing_control_plane_protocols_control_plane_protocol_pim_address_family_ms
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struct nb_cb_destroy_args *args);
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int routing_control_plane_protocols_control_plane_protocol_pim_address_family_msdp_peer_source_ip_modify(
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struct nb_cb_modify_args *args);
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int pim_msdp_peer_sa_filter_in_modify(struct nb_cb_modify_args *args);
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int pim_msdp_peer_sa_filter_in_destroy(struct nb_cb_destroy_args *args);
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int pim_msdp_peer_sa_filter_out_modify(struct nb_cb_modify_args *args);
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int pim_msdp_peer_sa_filter_out_destroy(struct nb_cb_destroy_args *args);
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int routing_control_plane_protocols_control_plane_protocol_pim_address_family_mlag_create(
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struct nb_cb_create_args *args);
|
||||
int routing_control_plane_protocols_control_plane_protocol_pim_address_family_mlag_destroy(
|
||||
|
|
|
|||
|
|
@ -1286,6 +1286,94 @@ int routing_control_plane_protocols_control_plane_protocol_pim_address_family_ms
|
|||
}
|
||||
#endif /* PIM_IPV != 6 */
|
||||
|
||||
/*
|
||||
* XPath:
|
||||
* /frr-routing:routing/control-plane-protocols/control-plane-protocol/frr-pim:pim/address-family/msdp-peer/sa-filter-in
|
||||
*/
|
||||
int pim_msdp_peer_sa_filter_in_modify(struct nb_cb_modify_args *args)
|
||||
{
|
||||
struct pim_msdp_peer *mp;
|
||||
|
||||
switch (args->event) {
|
||||
case NB_EV_VALIDATE:
|
||||
case NB_EV_PREPARE:
|
||||
case NB_EV_ABORT:
|
||||
/* NOTHING */
|
||||
break;
|
||||
case NB_EV_APPLY:
|
||||
mp = nb_running_get_entry(args->dnode, NULL, true);
|
||||
XFREE(MTYPE_TMP, mp->acl_in);
|
||||
mp->acl_in = XSTRDUP(MTYPE_TMP,
|
||||
yang_dnode_get_string(args->dnode, NULL));
|
||||
break;
|
||||
}
|
||||
|
||||
return NB_OK;
|
||||
}
|
||||
|
||||
int pim_msdp_peer_sa_filter_in_destroy(struct nb_cb_destroy_args *args)
|
||||
{
|
||||
struct pim_msdp_peer *mp;
|
||||
|
||||
switch (args->event) {
|
||||
case NB_EV_VALIDATE:
|
||||
case NB_EV_PREPARE:
|
||||
case NB_EV_ABORT:
|
||||
/* NOTHING */
|
||||
break;
|
||||
case NB_EV_APPLY:
|
||||
mp = nb_running_get_entry(args->dnode, NULL, true);
|
||||
XFREE(MTYPE_TMP, mp->acl_in);
|
||||
break;
|
||||
}
|
||||
|
||||
return NB_OK;
|
||||
}
|
||||
|
||||
/*
|
||||
* XPath:
|
||||
* /frr-routing:routing/control-plane-protocols/control-plane-protocol/frr-pim:pim/address-family/msdp-peer/sa-filter-out
|
||||
*/
|
||||
int pim_msdp_peer_sa_filter_out_modify(struct nb_cb_modify_args *args)
|
||||
{
|
||||
struct pim_msdp_peer *mp;
|
||||
|
||||
switch (args->event) {
|
||||
case NB_EV_VALIDATE:
|
||||
case NB_EV_PREPARE:
|
||||
case NB_EV_ABORT:
|
||||
/* NOTHING */
|
||||
break;
|
||||
case NB_EV_APPLY:
|
||||
mp = nb_running_get_entry(args->dnode, NULL, true);
|
||||
XFREE(MTYPE_TMP, mp->acl_out);
|
||||
mp->acl_out = XSTRDUP(MTYPE_TMP,
|
||||
yang_dnode_get_string(args->dnode, NULL));
|
||||
break;
|
||||
}
|
||||
|
||||
return NB_OK;
|
||||
}
|
||||
|
||||
int pim_msdp_peer_sa_filter_out_destroy(struct nb_cb_destroy_args *args)
|
||||
{
|
||||
struct pim_msdp_peer *mp;
|
||||
|
||||
switch (args->event) {
|
||||
case NB_EV_VALIDATE:
|
||||
case NB_EV_PREPARE:
|
||||
case NB_EV_ABORT:
|
||||
/* NOTHING */
|
||||
break;
|
||||
case NB_EV_APPLY:
|
||||
mp = nb_running_get_entry(args->dnode, NULL, true);
|
||||
XFREE(MTYPE_TMP, mp->acl_out);
|
||||
break;
|
||||
}
|
||||
|
||||
return NB_OK;
|
||||
}
|
||||
|
||||
/*
|
||||
* XPath: /frr-routing:routing/control-plane-protocols/control-plane-protocol/frr-pim:pim/address-family/mlag
|
||||
*/
|
||||
|
|
|
|||
Loading…
Reference in a new issue