diff options
Diffstat (limited to '')
-rw-r--r-- | pbrd/pbr_zebra.c | 616 |
1 files changed, 616 insertions, 0 deletions
diff --git a/pbrd/pbr_zebra.c b/pbrd/pbr_zebra.c new file mode 100644 index 0000000..4506dc1 --- /dev/null +++ b/pbrd/pbr_zebra.c @@ -0,0 +1,616 @@ +/* + * Zebra connect code. + * Copyright (C) 2018 Cumulus Networks, Inc. + * Donald Sharp + * + * FRR is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2, or (at your option) any + * later version. + * + * FRR is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; see the file COPYING; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ +#include <zebra.h> + +#include "thread.h" +#include "command.h" +#include "network.h" +#include "prefix.h" +#include "routemap.h" +#include "table.h" +#include "stream.h" +#include "memory.h" +#include "zclient.h" +#include "filter.h" +#include "plist.h" +#include "log.h" +#include "nexthop.h" +#include "nexthop_group.h" + +#include "pbr_nht.h" +#include "pbr_map.h" +#include "pbr_memory.h" +#include "pbr_zebra.h" +#include "pbr_debug.h" +#include "pbr_vrf.h" + +DEFINE_MTYPE_STATIC(PBRD, PBR_INTERFACE, "PBR Interface"); + +/* Zebra structure to hold current status. */ +struct zclient *zclient; + +struct pbr_interface *pbr_if_new(struct interface *ifp) +{ + struct pbr_interface *pbr_ifp; + + assert(ifp); + assert(!ifp->info); + + pbr_ifp = XCALLOC(MTYPE_PBR_INTERFACE, sizeof(*pbr_ifp)); + + ifp->info = pbr_ifp; + return pbr_ifp; +} + +void pbr_if_del(struct interface *ifp) +{ + XFREE(MTYPE_PBR_INTERFACE, ifp->info); +} + +/* Interface addition message from zebra. */ +int pbr_ifp_create(struct interface *ifp) +{ + DEBUGD(&pbr_dbg_zebra, "%s: %s", __func__, ifp->name); + + if (!ifp->info) + pbr_if_new(ifp); + + pbr_nht_interface_update(ifp); + /* Update nexthops tracked from a `set nexthop` command */ + pbr_nht_nexthop_interface_update(ifp); + + pbr_map_policy_interface_update(ifp, true); + + return 0; +} + +int pbr_ifp_destroy(struct interface *ifp) +{ + DEBUGD(&pbr_dbg_zebra, "%s: %s", __func__, ifp->name); + + pbr_map_policy_interface_update(ifp, false); + + return 0; +} + +static int interface_address_add(ZAPI_CALLBACK_ARGS) +{ + struct connected *c; + char buf[PREFIX_STRLEN]; + + c = zebra_interface_address_read(cmd, zclient->ibuf, vrf_id); + + DEBUGD(&pbr_dbg_zebra, "%s: %s added %s", __func__, + c ? c->ifp->name : "Unknown", + c ? prefix2str(c->address, buf, sizeof(buf)) : "Unknown"); + + return 0; +} + +static int interface_address_delete(ZAPI_CALLBACK_ARGS) +{ + struct connected *c; + + c = zebra_interface_address_read(cmd, zclient->ibuf, vrf_id); + + if (!c) + return 0; + + DEBUGD(&pbr_dbg_zebra, "%s: %s deleted %pFX", __func__, c->ifp->name, + c->address); + + connected_free(&c); + return 0; +} + +int pbr_ifp_up(struct interface *ifp) +{ + DEBUGD(&pbr_dbg_zebra, "%s: %s is up", __func__, ifp->name); + + pbr_nht_nexthop_interface_update(ifp); + + return 0; +} + +int pbr_ifp_down(struct interface *ifp) +{ + DEBUGD(&pbr_dbg_zebra, "%s: %s is down", __func__, ifp->name); + + pbr_nht_nexthop_interface_update(ifp); + + return 0; +} + +static int interface_vrf_update(ZAPI_CALLBACK_ARGS) +{ + struct interface *ifp; + vrf_id_t new_vrf_id; + + ifp = zebra_interface_vrf_update_read(zclient->ibuf, vrf_id, + &new_vrf_id); + + if (!ifp) { + DEBUGD(&pbr_dbg_zebra, "%s: VRF change interface not found", + __func__); + + return 0; + } + + DEBUGD(&pbr_dbg_zebra, "%s: %s VRF change %u -> %u", __func__, + ifp->name, vrf_id, new_vrf_id); + + if_update_to_new_vrf(ifp, new_vrf_id); + + return 0; +} + +static int route_notify_owner(ZAPI_CALLBACK_ARGS) +{ + struct prefix p; + enum zapi_route_notify_owner note; + uint32_t table_id; + + if (!zapi_route_notify_decode(zclient->ibuf, &p, &table_id, ¬e, + NULL, NULL)) + return -1; + + switch (note) { + case ZAPI_ROUTE_FAIL_INSTALL: + DEBUGD(&pbr_dbg_zebra, + "%s: [%pFX] Route install failure for table: %u", + __func__, &p, table_id); + break; + case ZAPI_ROUTE_BETTER_ADMIN_WON: + DEBUGD(&pbr_dbg_zebra, + "%s: [%pFX] Route better admin distance won for table: %u", + __func__, &p, table_id); + break; + case ZAPI_ROUTE_INSTALLED: + DEBUGD(&pbr_dbg_zebra, + "%s: [%pFX] Route installed succeeded for table: %u", + __func__, &p, table_id); + pbr_nht_route_installed_for_table(table_id); + break; + case ZAPI_ROUTE_REMOVED: + DEBUGD(&pbr_dbg_zebra, + "%s: [%pFX] Route Removed succeeded for table: %u", + __func__, &p, table_id); + pbr_nht_route_removed_for_table(table_id); + break; + case ZAPI_ROUTE_REMOVE_FAIL: + DEBUGD(&pbr_dbg_zebra, + "%s: [%pFX] Route remove fail for table: %u", __func__, + &p, table_id); + break; + } + + return 0; +} + +static int rule_notify_owner(ZAPI_CALLBACK_ARGS) +{ + uint32_t seqno, priority, unique; + enum zapi_rule_notify_owner note; + struct pbr_map_sequence *pbrms; + struct pbr_map_interface *pmi; + char ifname[INTERFACE_NAMSIZ + 1]; + uint64_t installed; + + if (!zapi_rule_notify_decode(zclient->ibuf, &seqno, &priority, &unique, + ifname, ¬e)) + return -1; + + pmi = NULL; + pbrms = pbrms_lookup_unique(unique, ifname, &pmi); + if (!pbrms) { + DEBUGD(&pbr_dbg_zebra, + "%s: Failure to lookup pbrms based upon %u", __func__, + unique); + return 0; + } + + installed = 1 << pmi->install_bit; + + switch (note) { + case ZAPI_RULE_FAIL_INSTALL: + pbrms->installed &= ~installed; + break; + case ZAPI_RULE_INSTALLED: + pbrms->installed |= installed; + break; + case ZAPI_RULE_FAIL_REMOVE: + /* Don't change state on rule removal failure */ + break; + case ZAPI_RULE_REMOVED: + pbrms->installed &= ~installed; + break; + } + + DEBUGD(&pbr_dbg_zebra, "%s: Received %s: %" PRIu64, __func__, + zapi_rule_notify_owner2str(note), pbrms->installed); + + pbr_map_final_interface_deletion(pbrms->parent, pmi); + + return 0; +} + +static void zebra_connected(struct zclient *zclient) +{ + DEBUGD(&pbr_dbg_zebra, "%s: Registering for fun and profit", __func__); + zclient_send_reg_requests(zclient, VRF_DEFAULT); +} + +static void route_add_helper(struct zapi_route *api, struct nexthop_group nhg, + uint8_t install_afi) +{ + struct zapi_nexthop *api_nh; + struct nexthop *nhop; + int i; + + api->prefix.family = install_afi; + + DEBUGD(&pbr_dbg_zebra, " Encoding %pFX", &api->prefix); + + i = 0; + for (ALL_NEXTHOPS(nhg, nhop)) { + api_nh = &api->nexthops[i]; + api_nh->vrf_id = nhop->vrf_id; + api_nh->type = nhop->type; + api_nh->weight = nhop->weight; + switch (nhop->type) { + case NEXTHOP_TYPE_IPV4: + api_nh->gate.ipv4 = nhop->gate.ipv4; + break; + case NEXTHOP_TYPE_IPV4_IFINDEX: + api_nh->gate.ipv4 = nhop->gate.ipv4; + api_nh->ifindex = nhop->ifindex; + break; + case NEXTHOP_TYPE_IFINDEX: + api_nh->ifindex = nhop->ifindex; + break; + case NEXTHOP_TYPE_IPV6: + memcpy(&api_nh->gate.ipv6, &nhop->gate.ipv6, + IPV6_MAX_BYTELEN); + break; + case NEXTHOP_TYPE_IPV6_IFINDEX: + api_nh->ifindex = nhop->ifindex; + memcpy(&api_nh->gate.ipv6, &nhop->gate.ipv6, + IPV6_MAX_BYTELEN); + break; + case NEXTHOP_TYPE_BLACKHOLE: + api_nh->bh_type = nhop->bh_type; + break; + } + i++; + } + api->nexthop_num = i; + + zclient_route_send(ZEBRA_ROUTE_ADD, zclient, api); +} + +/* + * This function assumes a default route is being + * installed into the appropriate tableid + */ +void route_add(struct pbr_nexthop_group_cache *pnhgc, struct nexthop_group nhg, + afi_t install_afi) +{ + struct zapi_route api; + + DEBUGD(&pbr_dbg_zebra, "%s for Table: %d", __func__, pnhgc->table_id); + + memset(&api, 0, sizeof(api)); + + api.vrf_id = VRF_DEFAULT; + api.type = ZEBRA_ROUTE_PBR; + api.safi = SAFI_UNICAST; + /* + * Sending a default route + */ + api.tableid = pnhgc->table_id; + SET_FLAG(api.flags, ZEBRA_FLAG_ALLOW_RECURSION); + SET_FLAG(api.message, ZAPI_MESSAGE_TABLEID); + SET_FLAG(api.message, ZAPI_MESSAGE_NEXTHOP); + switch (install_afi) { + case AFI_MAX: + route_add_helper(&api, nhg, AF_INET); + route_add_helper(&api, nhg, AF_INET6); + break; + case AFI_IP: + route_add_helper(&api, nhg, AF_INET); + break; + case AFI_IP6: + route_add_helper(&api, nhg, AF_INET6); + break; + case AFI_L2VPN: + DEBUGD(&pbr_dbg_zebra, + "%s: Asked to install unsupported route type: L2VPN", + __func__); + break; + case AFI_UNSPEC: + DEBUGD(&pbr_dbg_zebra, + "%s: Asked to install unspecified route type", __func__); + break; + } +} + +/* + * This function assumes a default route is being + * removed from the appropriate tableid + */ +void route_delete(struct pbr_nexthop_group_cache *pnhgc, afi_t afi) +{ + struct zapi_route api; + + DEBUGD(&pbr_dbg_zebra, "%s for Table: %d", __func__, pnhgc->table_id); + + memset(&api, 0, sizeof(api)); + api.vrf_id = VRF_DEFAULT; + api.type = ZEBRA_ROUTE_PBR; + api.safi = SAFI_UNICAST; + + api.tableid = pnhgc->table_id; + SET_FLAG(api.message, ZAPI_MESSAGE_TABLEID); + + switch (afi) { + case AFI_IP: + api.prefix.family = AF_INET; + zclient_route_send(ZEBRA_ROUTE_DELETE, zclient, &api); + break; + case AFI_IP6: + api.prefix.family = AF_INET6; + zclient_route_send(ZEBRA_ROUTE_DELETE, zclient, &api); + break; + case AFI_MAX: + api.prefix.family = AF_INET; + zclient_route_send(ZEBRA_ROUTE_DELETE, zclient, &api); + api.prefix.family = AF_INET6; + zclient_route_send(ZEBRA_ROUTE_DELETE, zclient, &api); + break; + case AFI_L2VPN: + DEBUGD(&pbr_dbg_zebra, + "%s: Asked to delete unsupported route type: L2VPN", + __func__); + break; + case AFI_UNSPEC: + DEBUGD(&pbr_dbg_zebra, + "%s: Asked to delete unspecified route type", __func__); + break; + } +} + +static int pbr_zebra_nexthop_update(ZAPI_CALLBACK_ARGS) +{ + struct zapi_route nhr; + struct prefix matched; + uint32_t i; + + if (!zapi_nexthop_update_decode(zclient->ibuf, &matched, &nhr)) { + zlog_err("Failure to decode Nexthop update message"); + return 0; + } + + if (DEBUG_MODE_CHECK(&pbr_dbg_zebra, DEBUG_MODE_ALL)) { + + DEBUGD(&pbr_dbg_zebra, + "%s: Received Nexthop update: %pFX against %pFX", + __func__, &matched, &nhr.prefix); + + DEBUGD(&pbr_dbg_zebra, "%s: (Nexthops(%u)", __func__, + nhr.nexthop_num); + + for (i = 0; i < nhr.nexthop_num; i++) { + DEBUGD(&pbr_dbg_zebra, + "%s: Type: %d: vrf: %d, ifindex: %d gate: %pI4", + __func__, nhr.nexthops[i].type, + nhr.nexthops[i].vrf_id, nhr.nexthops[i].ifindex, + &nhr.nexthops[i].gate.ipv4); + } + } + + nhr.prefix = matched; + pbr_nht_nexthop_update(&nhr); + return 1; +} + +extern struct zebra_privs_t pbr_privs; + +static zclient_handler *const pbr_handlers[] = { + [ZEBRA_INTERFACE_ADDRESS_ADD] = interface_address_add, + [ZEBRA_INTERFACE_ADDRESS_DELETE] = interface_address_delete, + [ZEBRA_INTERFACE_VRF_UPDATE] = interface_vrf_update, + [ZEBRA_ROUTE_NOTIFY_OWNER] = route_notify_owner, + [ZEBRA_RULE_NOTIFY_OWNER] = rule_notify_owner, + [ZEBRA_NEXTHOP_UPDATE] = pbr_zebra_nexthop_update, +}; + +void pbr_zebra_init(void) +{ + struct zclient_options opt = { .receive_notify = true }; + + zclient = zclient_new(master, &opt, pbr_handlers, + array_size(pbr_handlers)); + + zclient_init(zclient, ZEBRA_ROUTE_PBR, 0, &pbr_privs); + zclient->zebra_connected = zebra_connected; +} + +void pbr_send_rnh(struct nexthop *nhop, bool reg) +{ + uint32_t command; + struct prefix p; + + command = (reg) ? + ZEBRA_NEXTHOP_REGISTER : ZEBRA_NEXTHOP_UNREGISTER; + + memset(&p, 0, sizeof(p)); + switch (nhop->type) { + case NEXTHOP_TYPE_IFINDEX: + case NEXTHOP_TYPE_BLACKHOLE: + return; + case NEXTHOP_TYPE_IPV4: + case NEXTHOP_TYPE_IPV4_IFINDEX: + p.family = AF_INET; + p.u.prefix4.s_addr = nhop->gate.ipv4.s_addr; + p.prefixlen = IPV4_MAX_BITLEN; + break; + case NEXTHOP_TYPE_IPV6: + case NEXTHOP_TYPE_IPV6_IFINDEX: + p.family = AF_INET6; + memcpy(&p.u.prefix6, &nhop->gate.ipv6, IPV6_MAX_BYTELEN); + p.prefixlen = IPV6_MAX_BITLEN; + if (IN6_IS_ADDR_LINKLOCAL(&nhop->gate.ipv6)) + /* + * Don't bother tracking link locals, just track their + * interface state. + */ + return; + break; + } + + if (zclient_send_rnh(zclient, command, &p, SAFI_UNICAST, false, false, + nhop->vrf_id) + == ZCLIENT_SEND_FAILURE) { + zlog_warn("%s: Failure to send nexthop to zebra", __func__); + } +} + +static void pbr_encode_pbr_map_sequence_prefix(struct stream *s, + struct prefix *p, + unsigned char family) +{ + struct prefix any; + + if (!p) { + memset(&any, 0, sizeof(any)); + any.family = family; + p = &any; + } + + stream_putc(s, p->family); + stream_putc(s, p->prefixlen); + stream_put(s, &p->u.prefix, prefix_blen(p)); +} + +static void +pbr_encode_pbr_map_sequence_vrf(struct stream *s, + const struct pbr_map_sequence *pbrms, + const struct interface *ifp) +{ + struct pbr_vrf *pbr_vrf; + + if (pbrms->vrf_unchanged) + pbr_vrf = ifp->vrf->info; + else + pbr_vrf = pbr_vrf_lookup_by_name(pbrms->vrf_name); + + if (!pbr_vrf) { + DEBUGD(&pbr_dbg_zebra, "%s: VRF not found", __func__); + return; + } + + stream_putl(s, pbr_vrf->vrf->data.l.table_id); +} + +static void pbr_encode_pbr_map_sequence(struct stream *s, + struct pbr_map_sequence *pbrms, + struct interface *ifp) +{ + unsigned char family; + + family = AF_INET; + if (pbrms->family) + family = pbrms->family; + + stream_putl(s, pbrms->seqno); + stream_putl(s, pbrms->ruleno); + stream_putl(s, pbrms->unique); + stream_putc(s, pbrms->ip_proto); /* The ip_proto */ + pbr_encode_pbr_map_sequence_prefix(s, pbrms->src, family); + stream_putw(s, pbrms->src_prt); + pbr_encode_pbr_map_sequence_prefix(s, pbrms->dst, family); + stream_putw(s, pbrms->dst_prt); + stream_putc(s, pbrms->dsfield); + stream_putl(s, pbrms->mark); + + stream_putl(s, pbrms->action_queue_id); + + stream_putw(s, pbrms->action_vlan_id); + stream_putw(s, pbrms->action_vlan_flags); + stream_putw(s, pbrms->action_pcp); + + if (pbrms->vrf_unchanged || pbrms->vrf_lookup) + pbr_encode_pbr_map_sequence_vrf(s, pbrms, ifp); + else if (pbrms->nhgrp_name) + stream_putl(s, pbr_nht_get_table(pbrms->nhgrp_name)); + else if (pbrms->nhg) + stream_putl(s, pbr_nht_get_table(pbrms->internal_nhg_name)); + stream_put(s, ifp->name, INTERFACE_NAMSIZ); +} + +bool pbr_send_pbr_map(struct pbr_map_sequence *pbrms, + struct pbr_map_interface *pmi, bool install, bool changed) +{ + struct pbr_map *pbrm = pbrms->parent; + struct stream *s; + uint64_t is_installed = (uint64_t)1 << pmi->install_bit; + + is_installed &= pbrms->installed; + + DEBUGD(&pbr_dbg_zebra, "%s: for %s %d(%" PRIu64 ")", __func__, + pbrm->name, install, is_installed); + + /* + * If we are installed and asked to do so again and the config + * has not changed, just return. + * + * If we are not installed and asked + * to delete just return. + */ + if (install && is_installed && !changed) + return false; + + if (!install && !is_installed) + return false; + + s = zclient->obuf; + stream_reset(s); + + zclient_create_header(s, + install ? ZEBRA_RULE_ADD : ZEBRA_RULE_DELETE, + VRF_DEFAULT); + + /* + * We are sending one item at a time at the moment + */ + stream_putl(s, 1); + + DEBUGD(&pbr_dbg_zebra, "%s: %s %s seq %u %d %s %u", __func__, + install ? "Installing" : "Deleting", pbrm->name, pbrms->seqno, + install, pmi->ifp->name, pmi->delete); + + pbr_encode_pbr_map_sequence(s, pbrms, pmi->ifp); + + stream_putw_at(s, 0, stream_get_endp(s)); + + zclient_send_message(zclient); + + return true; +} |