diff options
Diffstat (limited to 'ripngd/ripngd.c')
| -rw-r--r-- | ripngd/ripngd.c | 2718 |
1 files changed, 2718 insertions, 0 deletions
diff --git a/ripngd/ripngd.c b/ripngd/ripngd.c new file mode 100644 index 0000000..465b40b --- /dev/null +++ b/ripngd/ripngd.c @@ -0,0 +1,2718 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* RIPng daemon + * Copyright (C) 1998, 1999 Kunihiro Ishiguro + */ + +#include <zebra.h> + +#include "prefix.h" +#include "filter.h" +#include "log.h" +#include "frrevent.h" +#include "memory.h" +#include "if.h" +#include "stream.h" +#include "agg_table.h" +#include "command.h" +#include "sockopt.h" +#include "distribute.h" +#include "plist.h" +#include "routemap.h" +#include "if_rmap.h" +#include "privs.h" +#include "lib_errors.h" +#include "northbound_cli.h" +#include "network.h" + +#include "ripngd/ripngd.h" +#include "ripngd/ripng_route.h" +#include "ripngd/ripng_debug.h" +#include "ripngd/ripng_nexthop.h" + +DEFINE_MGROUP(RIPNGD, "ripngd"); +DEFINE_MTYPE_STATIC(RIPNGD, RIPNG, "RIPng structure"); +DEFINE_MTYPE_STATIC(RIPNGD, RIPNG_VRF_NAME, "RIPng VRF name"); +DEFINE_MTYPE_STATIC(RIPNGD, RIPNG_ROUTE, "RIPng route info"); + +enum { ripng_all_route, + ripng_changed_route, +}; + +static void ripng_distribute_update(struct distribute_ctx *ctx, + struct distribute *dist); + +/* Prototypes. */ +void ripng_output_process(struct interface *, struct sockaddr_in6 *, int); +static void ripng_instance_enable(struct ripng *ripng, struct vrf *vrf, + int sock); +static void ripng_instance_disable(struct ripng *ripng); +static void ripng_triggered_update(struct event *); +static void ripng_if_rmap_update(struct if_rmap_ctx *ctx, + struct if_rmap *if_rmap); + +/* Generate rb-tree of RIPng instances. */ +static inline int ripng_instance_compare(const struct ripng *a, + const struct ripng *b) +{ + return strcmp(a->vrf_name, b->vrf_name); +} +RB_GENERATE(ripng_instance_head, ripng, entry, ripng_instance_compare) + +struct ripng_instance_head ripng_instances = RB_INITIALIZER(&ripng_instances); + +/* RIPng next hop specification. */ +struct ripng_nexthop { + enum ripng_nexthop_type { + RIPNG_NEXTHOP_UNSPEC, + RIPNG_NEXTHOP_ADDRESS + } flag; + struct in6_addr address; +}; + +int ripng_route_rte(struct ripng_info *rinfo) +{ + return (rinfo->type == ZEBRA_ROUTE_RIPNG + && rinfo->sub_type == RIPNG_ROUTE_RTE); +} + +/* Allocate new ripng information. */ +struct ripng_info *ripng_info_new(void) +{ + struct ripng_info *new; + + new = XCALLOC(MTYPE_RIPNG_ROUTE, sizeof(struct ripng_info)); + return new; +} + +/* Free ripng information. */ +void ripng_info_free(struct ripng_info *rinfo) +{ + XFREE(MTYPE_RIPNG_ROUTE, rinfo); +} + +struct ripng *ripng_info_get_instance(const struct ripng_info *rinfo) +{ + return agg_get_table_info(agg_get_table(rinfo->rp)); +} + +/* Create ripng socket. */ +int ripng_make_socket(struct vrf *vrf) +{ + int ret; + int sock; + struct sockaddr_in6 ripaddr; + const char *vrf_dev = NULL; + + /* Make datagram socket. */ + if (vrf->vrf_id != VRF_DEFAULT) + vrf_dev = vrf->name; + frr_with_privs(&ripngd_privs) { + sock = vrf_socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP, + vrf->vrf_id, vrf_dev); + if (sock < 0) { + flog_err_sys(EC_LIB_SOCKET, + "Cannot create UDP socket: %s", + safe_strerror(errno)); + return -1; + } + } + + sockopt_reuseaddr(sock); + sockopt_reuseport(sock); + setsockopt_so_recvbuf(sock, 8096); + ret = setsockopt_ipv6_pktinfo(sock, 1); + if (ret < 0) + goto error; +#ifdef IPTOS_PREC_INTERNETCONTROL + ret = setsockopt_ipv6_tclass(sock, IPTOS_PREC_INTERNETCONTROL); + if (ret < 0) + goto error; +#endif + ret = setsockopt_ipv6_multicast_hops(sock, 255); + if (ret < 0) + goto error; + ret = setsockopt_ipv6_multicast_loop(sock, 0); + if (ret < 0) + goto error; + ret = setsockopt_ipv6_hoplimit(sock, 1); + if (ret < 0) + goto error; + + memset(&ripaddr, 0, sizeof(ripaddr)); + ripaddr.sin6_family = AF_INET6; +#ifdef SIN6_LEN + ripaddr.sin6_len = sizeof(struct sockaddr_in6); +#endif /* SIN6_LEN */ + ripaddr.sin6_port = htons(RIPNG_PORT_DEFAULT); + + frr_with_privs(&ripngd_privs) { + ret = bind(sock, (struct sockaddr *)&ripaddr, sizeof(ripaddr)); + if (ret < 0) { + zlog_err("Can't bind ripng socket: %s.", + safe_strerror(errno)); + goto error; + } + } + return sock; + +error: + close(sock); + return ret; +} + +/* Send RIPng packet. */ +int ripng_send_packet(caddr_t buf, int bufsize, struct sockaddr_in6 *to, + struct interface *ifp) +{ + struct ripng_interface *ri = ifp->info; + struct ripng *ripng = ri->ripng; + int ret; + struct msghdr msg; + struct iovec iov; + struct cmsghdr *cmsgptr; + char adata[256] = {}; + struct in6_pktinfo *pkt; + struct sockaddr_in6 addr; + + if (IS_RIPNG_DEBUG_SEND) { + if (to) + zlog_debug("send to %pI6", &to->sin6_addr); + zlog_debug(" send interface %s", ifp->name); + zlog_debug(" send packet size %d", bufsize); + } + + memset(&addr, 0, sizeof(addr)); + addr.sin6_family = AF_INET6; +#ifdef SIN6_LEN + addr.sin6_len = sizeof(struct sockaddr_in6); +#endif /* SIN6_LEN */ + addr.sin6_flowinfo = htonl(RIPNG_PRIORITY_DEFAULT); + + /* When destination is specified. */ + if (to != NULL) { + addr.sin6_addr = to->sin6_addr; + addr.sin6_port = to->sin6_port; + } else { + inet_pton(AF_INET6, RIPNG_GROUP, &addr.sin6_addr); + addr.sin6_port = htons(RIPNG_PORT_DEFAULT); + } + + memset(&msg, 0, sizeof(msg)); + msg.msg_name = (void *)&addr; + msg.msg_namelen = sizeof(struct sockaddr_in6); + msg.msg_iov = &iov; + msg.msg_iovlen = 1; + msg.msg_control = adata; + msg.msg_controllen = CMSG_SPACE(sizeof(struct in6_pktinfo)); + + iov.iov_base = buf; + iov.iov_len = bufsize; + + cmsgptr = (struct cmsghdr *)adata; + cmsgptr->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo)); + cmsgptr->cmsg_level = IPPROTO_IPV6; + cmsgptr->cmsg_type = IPV6_PKTINFO; + + pkt = (struct in6_pktinfo *)CMSG_DATA(cmsgptr); + memset(&pkt->ipi6_addr, 0, sizeof(struct in6_addr)); + pkt->ipi6_ifindex = ifp->ifindex; + + ret = sendmsg(ripng->sock, &msg, 0); + + if (ret < 0) { + if (to) + flog_err_sys(EC_LIB_SOCKET, + "RIPng send fail on %s to %pI6: %s", + ifp->name, &to->sin6_addr, + safe_strerror(errno)); + else + flog_err_sys(EC_LIB_SOCKET, "RIPng send fail on %s: %s", + ifp->name, safe_strerror(errno)); + } + + return ret; +} + +/* Receive UDP RIPng packet from socket. */ +static int ripng_recv_packet(int sock, uint8_t *buf, int bufsize, + struct sockaddr_in6 *from, ifindex_t *ifindex, + int *hoplimit) +{ + int ret; + struct msghdr msg; + struct iovec iov; + struct cmsghdr *cmsgptr; + struct in6_addr dst = {.s6_addr = {0}}; + + memset(&dst, 0, sizeof(dst)); + + /* Ancillary data. This store cmsghdr and in6_pktinfo. But at this + point I can't determine size of cmsghdr */ + char adata[1024]; + + /* Fill in message and iovec. */ + memset(&msg, 0, sizeof(msg)); + msg.msg_name = (void *)from; + msg.msg_namelen = sizeof(struct sockaddr_in6); + msg.msg_iov = &iov; + msg.msg_iovlen = 1; + msg.msg_control = (void *)adata; + msg.msg_controllen = sizeof(adata); + iov.iov_base = buf; + iov.iov_len = bufsize; + + /* If recvmsg fail return minus value. */ + ret = recvmsg(sock, &msg, 0); + if (ret < 0) + return ret; + + for (cmsgptr = CMSG_FIRSTHDR(&msg); cmsgptr != NULL; + cmsgptr = CMSG_NXTHDR(&msg, cmsgptr)) { + /* I want interface index which this packet comes from. */ + if (cmsgptr->cmsg_level == IPPROTO_IPV6 + && cmsgptr->cmsg_type == IPV6_PKTINFO) { + struct in6_pktinfo *ptr; + + ptr = (struct in6_pktinfo *)CMSG_DATA(cmsgptr); + *ifindex = ptr->ipi6_ifindex; + dst = ptr->ipi6_addr; + + if (*ifindex == 0) + zlog_warn( + "Interface index returned by IPV6_PKTINFO is zero"); + } + + /* Incoming packet's multicast hop limit. */ + if (cmsgptr->cmsg_level == IPPROTO_IPV6 + && cmsgptr->cmsg_type == IPV6_HOPLIMIT) { + int *phoplimit = (int *)CMSG_DATA(cmsgptr); + *hoplimit = *phoplimit; + } + } + + /* Hoplimit check shold be done when destination address is + multicast address. */ + if (!IN6_IS_ADDR_MULTICAST(&dst)) + *hoplimit = -1; + + return ret; +} + +/* Dump rip packet */ +void ripng_packet_dump(struct ripng_packet *packet, int size, + const char *sndrcv) +{ + caddr_t lim; + struct rte *rte; + const char *command_str; + + /* Set command string. */ + if (packet->command == RIPNG_REQUEST) + command_str = "request"; + else if (packet->command == RIPNG_RESPONSE) + command_str = "response"; + else + command_str = "unknown"; + + /* Dump packet header. */ + zlog_debug("%s %s version %d packet size %d", sndrcv, command_str, + packet->version, size); + + /* Dump each routing table entry. */ + rte = packet->rte; + + for (lim = (caddr_t)packet + size; (caddr_t)rte < lim; rte++) { + if (rte->metric == RIPNG_METRIC_NEXTHOP) + zlog_debug(" nexthop %pI6/%d", &rte->addr, + rte->prefixlen); + else + zlog_debug(" %pI6/%d metric %d tag %" ROUTE_TAG_PRI, + &rte->addr, rte->prefixlen, + rte->metric, (route_tag_t)ntohs(rte->tag)); + } +} + +/* RIPng next hop address RTE (Route Table Entry). */ +static void ripng_nexthop_rte(struct rte *rte, struct sockaddr_in6 *from, + struct ripng_nexthop *nexthop) +{ + /* Logging before checking RTE. */ + if (IS_RIPNG_DEBUG_RECV) + zlog_debug("RIPng nexthop RTE address %pI6 tag %" ROUTE_TAG_PRI + " prefixlen %d", + &rte->addr, (route_tag_t)ntohs(rte->tag), + rte->prefixlen); + + /* RFC2080 2.1.1 Next Hop: + The route tag and prefix length in the next hop RTE must be + set to zero on sending and ignored on receiption. */ + if (ntohs(rte->tag) != 0) + zlog_warn( + "RIPng nexthop RTE with non zero tag value %" ROUTE_TAG_PRI + " from %pI6", + (route_tag_t)ntohs(rte->tag), &from->sin6_addr); + + if (rte->prefixlen != 0) + zlog_warn( + "RIPng nexthop RTE with non zero prefixlen value %d from %pI6", + rte->prefixlen, &from->sin6_addr); + + /* Specifying a value of 0:0:0:0:0:0:0:0 in the prefix field of a + next hop RTE indicates that the next hop address should be the + originator of the RIPng advertisement. An address specified as a + next hop must be a link-local address. */ + if (IN6_IS_ADDR_UNSPECIFIED(&rte->addr)) { + nexthop->flag = RIPNG_NEXTHOP_UNSPEC; + memset(&nexthop->address, 0, sizeof(struct in6_addr)); + return; + } + + if (IN6_IS_ADDR_LINKLOCAL(&rte->addr)) { + nexthop->flag = RIPNG_NEXTHOP_ADDRESS; + IPV6_ADDR_COPY(&nexthop->address, &rte->addr); + return; + } + + /* The purpose of the next hop RTE is to eliminate packets being + routed through extra hops in the system. It is particularly useful + when RIPng is not being run on all of the routers on a network. + Note that next hop RTE is "advisory". That is, if the provided + information is ignored, a possibly sub-optimal, but absolutely + valid, route may be taken. If the received next hop address is not + a link-local address, it should be treated as 0:0:0:0:0:0:0:0. */ + zlog_warn("RIPng nexthop RTE with non link-local address %pI6 from %pI6", + &rte->addr, &from->sin6_addr); + + nexthop->flag = RIPNG_NEXTHOP_UNSPEC; + memset(&nexthop->address, 0, sizeof(struct in6_addr)); + + return; +} + +/* If ifp has same link-local address then return 1. */ +static int ripng_lladdr_check(struct interface *ifp, struct in6_addr *addr) +{ + struct listnode *node; + struct connected *connected; + struct prefix *p; + + for (ALL_LIST_ELEMENTS_RO(ifp->connected, node, connected)) { + p = connected->address; + + if (p->family == AF_INET6 + && IN6_IS_ADDR_LINKLOCAL(&p->u.prefix6) + && IN6_ARE_ADDR_EQUAL(&p->u.prefix6, addr)) + return 1; + } + return 0; +} + +/* RIPng route garbage collect timer. */ +static void ripng_garbage_collect(struct event *t) +{ + struct ripng_info *rinfo; + struct agg_node *rp; + + rinfo = EVENT_ARG(t); + + /* Off timeout timer. */ + EVENT_OFF(rinfo->t_timeout); + + /* Get route_node pointer. */ + rp = rinfo->rp; + + /* Unlock route_node. */ + listnode_delete(rp->info, rinfo); + if (list_isempty((struct list *)rp->info)) { + list_delete((struct list **)&rp->info); + agg_unlock_node(rp); + } + + /* Free RIPng routing information. */ + ripng_info_free(rinfo); +} + +static void ripng_timeout_update(struct ripng *ripng, struct ripng_info *rinfo); + +/* Add new route to the ECMP list. + * RETURN: the new entry added in the list, or NULL if it is not the first + * entry and ECMP is not allowed. + */ +struct ripng_info *ripng_ecmp_add(struct ripng *ripng, + struct ripng_info *rinfo_new) +{ + struct agg_node *rp = rinfo_new->rp; + struct ripng_info *rinfo = NULL; + struct ripng_info *rinfo_exist = NULL; + struct list *list = NULL; + struct listnode *node = NULL; + struct listnode *nnode = NULL; + + if (rp->info == NULL) + rp->info = list_new(); + list = (struct list *)rp->info; + + /* If ECMP is not allowed and some entry already exists in the list, + * do nothing. */ + if (listcount(list) && !ripng->ecmp) + return NULL; + + /* Add or replace an existing ECMP path with lower neighbor IP */ + if (listcount(list) && listcount(list) >= ripng->ecmp) { + struct ripng_info *from_highest = NULL; + + /* Find the rip_info struct that has the highest nexthop IP */ + for (ALL_LIST_ELEMENTS(list, node, nnode, rinfo_exist)) + if (!from_highest || + (from_highest && + IPV6_ADDR_CMP(&rinfo_exist->from, + &from_highest->from) > 0)) { + from_highest = rinfo_exist; + } + + /* If we have a route in ECMP group, delete the old + * one that has a higher next-hop address. Lower IP is + * preferred. + */ + if (ripng->ecmp > 1 && from_highest && + IPV6_ADDR_CMP(&from_highest->from, &rinfo_new->from) > 0) { + ripng_ecmp_delete(ripng, from_highest); + goto add_or_replace; + } + + return NULL; + } + +add_or_replace: + rinfo = ripng_info_new(); + memcpy(rinfo, rinfo_new, sizeof(struct ripng_info)); + listnode_add(list, rinfo); + + if (ripng_route_rte(rinfo)) { + ripng_timeout_update(ripng, rinfo); + ripng_zebra_ipv6_add(ripng, rp); + } + + ripng_aggregate_increment(rp, rinfo); + + /* Set the route change flag on the first entry. */ + rinfo = listgetdata(listhead(list)); + SET_FLAG(rinfo->flags, RIPNG_RTF_CHANGED); + + /* Signal the output process to trigger an update. */ + ripng_event(ripng, RIPNG_TRIGGERED_UPDATE, 0); + + return rinfo; +} + +/* Update ECMP routes to zebra when `allow-ecmp` changed. */ +void ripng_ecmp_change(struct ripng *ripng) +{ + struct agg_node *rp; + struct ripng_info *rinfo; + struct list *list; + struct listnode *node, *nextnode; + + for (rp = agg_route_top(ripng->table); rp; rp = agg_route_next(rp)) { + list = rp->info; + if (list && listcount(list) > 1) { + while (listcount(list) > ripng->ecmp) { + struct ripng_info *from_highest = NULL; + + for (ALL_LIST_ELEMENTS(list, node, nextnode, + rinfo)) { + if (!from_highest || + (from_highest && + IPV6_ADDR_CMP( + &rinfo->from, + &from_highest->from) > 0)) + from_highest = rinfo; + } + + ripng_ecmp_delete(ripng, from_highest); + } + } + } +} + +/* Replace the ECMP list with the new route. + * RETURN: the new entry added in the list + */ +struct ripng_info *ripng_ecmp_replace(struct ripng *ripng, + struct ripng_info *rinfo_new) +{ + struct agg_node *rp = rinfo_new->rp; + struct list *list = (struct list *)rp->info; + struct ripng_info *rinfo = NULL, *tmp_rinfo = NULL; + struct listnode *node = NULL, *nextnode = NULL; + + if (list == NULL || listcount(list) == 0) + return ripng_ecmp_add(ripng, rinfo_new); + + /* Get the first entry */ + rinfo = listgetdata(listhead(list)); + + /* Learnt route replaced by a local one. Delete it from zebra. */ + if (ripng_route_rte(rinfo) && !ripng_route_rte(rinfo_new)) + if (CHECK_FLAG(rinfo->flags, RIPNG_RTF_FIB)) + ripng_zebra_ipv6_delete(ripng, rp); + + if (rinfo->metric != RIPNG_METRIC_INFINITY) + ripng_aggregate_decrement_list(rp, list); + + /* Re-use the first entry, and delete the others. */ + for (ALL_LIST_ELEMENTS(list, node, nextnode, tmp_rinfo)) + if (tmp_rinfo != rinfo) { + EVENT_OFF(tmp_rinfo->t_timeout); + EVENT_OFF(tmp_rinfo->t_garbage_collect); + list_delete_node(list, node); + ripng_info_free(tmp_rinfo); + } + + EVENT_OFF(rinfo->t_timeout); + EVENT_OFF(rinfo->t_garbage_collect); + memcpy(rinfo, rinfo_new, sizeof(struct ripng_info)); + + if (ripng_route_rte(rinfo)) { + ripng_timeout_update(ripng, rinfo); + /* The ADD message implies an update. */ + ripng_zebra_ipv6_add(ripng, rp); + } + + ripng_aggregate_increment(rp, rinfo); + + /* Set the route change flag. */ + SET_FLAG(rinfo->flags, RIPNG_RTF_CHANGED); + + /* Signal the output process to trigger an update. */ + ripng_event(ripng, RIPNG_TRIGGERED_UPDATE, 0); + + return rinfo; +} + +/* Delete one route from the ECMP list. + * RETURN: + * null - the entry is freed, and other entries exist in the list + * the entry - the entry is the last one in the list; its metric is set + * to INFINITY, and the garbage collector is started for it + */ +struct ripng_info *ripng_ecmp_delete(struct ripng *ripng, + struct ripng_info *rinfo) +{ + struct agg_node *rp = rinfo->rp; + struct list *list = (struct list *)rp->info; + + EVENT_OFF(rinfo->t_timeout); + + if (rinfo->metric != RIPNG_METRIC_INFINITY) + ripng_aggregate_decrement(rp, rinfo); + + if (listcount(list) > 1) { + /* Some other ECMP entries still exist. Just delete this entry. + */ + EVENT_OFF(rinfo->t_garbage_collect); + listnode_delete(list, rinfo); + if (ripng_route_rte(rinfo) && + CHECK_FLAG(rinfo->flags, RIPNG_RTF_FIB)) + /* The ADD message implies the update. */ + ripng_zebra_ipv6_add(ripng, rp); + ripng_info_free(rinfo); + rinfo = NULL; + } else { + assert(rinfo == listgetdata(listhead(list))); + + /* This is the only entry left in the list. We must keep it in + * the list for garbage collection time, with INFINITY metric. + */ + + rinfo->metric = RIPNG_METRIC_INFINITY; + RIPNG_TIMER_ON(rinfo->t_garbage_collect, ripng_garbage_collect, + ripng->garbage_time); + + if (ripng_route_rte(rinfo) && + CHECK_FLAG(rinfo->flags, RIPNG_RTF_FIB)) + ripng_zebra_ipv6_delete(ripng, rp); + } + + /* Set the route change flag on the first entry. */ + rinfo = listgetdata(listhead(list)); + SET_FLAG(rinfo->flags, RIPNG_RTF_CHANGED); + + /* Signal the output process to trigger an update. */ + ripng_event(ripng, RIPNG_TRIGGERED_UPDATE, 0); + + return rinfo; +} + +/* Timeout RIPng routes. */ +static void ripng_timeout(struct event *t) +{ + struct ripng_info *rinfo = EVENT_ARG(t); + struct ripng *ripng = ripng_info_get_instance(rinfo); + + ripng_ecmp_delete(ripng, rinfo); +} + +static void ripng_timeout_update(struct ripng *ripng, struct ripng_info *rinfo) +{ + if (rinfo->metric != RIPNG_METRIC_INFINITY) { + EVENT_OFF(rinfo->t_timeout); + event_add_timer(master, ripng_timeout, rinfo, + ripng->timeout_time, &rinfo->t_timeout); + } +} + +static int ripng_filter(int ripng_distribute, struct prefix_ipv6 *p, + struct ripng_interface *ri) +{ + struct distribute *dist; + struct access_list *alist; + struct prefix_list *plist; + int distribute = ripng_distribute == RIPNG_FILTER_OUT + ? DISTRIBUTE_V6_OUT + : DISTRIBUTE_V6_IN; + const char *inout = ripng_distribute == RIPNG_FILTER_OUT ? "out" : "in"; + + /* Input distribute-list filtering. */ + if (ri->list[ripng_distribute]) { + if (access_list_apply(ri->list[ripng_distribute], + (struct prefix *)p) == FILTER_DENY) { + if (IS_RIPNG_DEBUG_PACKET) + zlog_debug("%pFX filtered by distribute %s", p, + inout); + return -1; + } + } + if (ri->prefix[ripng_distribute]) { + if (prefix_list_apply(ri->prefix[ripng_distribute], + (struct prefix *)p) == PREFIX_DENY) { + if (IS_RIPNG_DEBUG_PACKET) + zlog_debug("%pFX filtered by prefix-list %s", p, + inout); + return -1; + } + } + + /* All interface filter check. */ + dist = distribute_lookup(ri->ripng->distribute_ctx, NULL); + if (dist) { + if (dist->list[distribute]) { + alist = access_list_lookup(AFI_IP6, + dist->list[distribute]); + + if (alist) { + if (access_list_apply(alist, (struct prefix *)p) + == FILTER_DENY) { + if (IS_RIPNG_DEBUG_PACKET) + zlog_debug( + "%pFX filtered by distribute %s", + p, inout); + return -1; + } + } + } + if (dist->prefix[distribute]) { + plist = prefix_list_lookup(AFI_IP6, + dist->prefix[distribute]); + + if (plist) { + if (prefix_list_apply(plist, (struct prefix *)p) + == PREFIX_DENY) { + if (IS_RIPNG_DEBUG_PACKET) + zlog_debug( + "%pFX filtered by prefix-list %s", + p, inout); + return -1; + } + } + } + } + return 0; +} + +/* Process RIPng route according to RFC2080. */ +static void ripng_route_process(struct rte *rte, struct sockaddr_in6 *from, + struct ripng_nexthop *ripng_nexthop, + struct interface *ifp) +{ + int ret; + struct prefix_ipv6 p; + struct agg_node *rp; + struct ripng_info *rinfo = NULL, newinfo; + struct ripng_interface *ri; + struct ripng *ripng; + struct in6_addr *nexthop; + int same = 0; + struct list *list = NULL; + struct listnode *node = NULL; + + /* Make prefix structure. */ + memset(&p, 0, sizeof(struct prefix_ipv6)); + p.family = AF_INET6; + /* p.prefix = rte->addr; */ + IPV6_ADDR_COPY(&p.prefix, &rte->addr); + p.prefixlen = rte->prefixlen; + + /* Make sure mask is applied. */ + /* XXX We have to check the prefix is valid or not before call + apply_mask_ipv6. */ + apply_mask_ipv6(&p); + + ri = ifp->info; + ripng = ri->ripng; + + /* Apply input filters. */ + ret = ripng_filter(RIPNG_FILTER_IN, &p, ri); + if (ret < 0) + return; + + memset(&newinfo, 0, sizeof(newinfo)); + newinfo.type = ZEBRA_ROUTE_RIPNG; + newinfo.sub_type = RIPNG_ROUTE_RTE; + if (ripng_nexthop->flag == RIPNG_NEXTHOP_ADDRESS) + newinfo.nexthop = ripng_nexthop->address; + else + newinfo.nexthop = from->sin6_addr; + newinfo.from = from->sin6_addr; + newinfo.ifindex = ifp->ifindex; + newinfo.metric = rte->metric; + newinfo.metric_out = rte->metric; /* XXX */ + newinfo.tag = ntohs(rte->tag); /* XXX */ + + /* Modify entry. */ + if (ri->routemap[RIPNG_FILTER_IN]) { + ret = route_map_apply(ri->routemap[RIPNG_FILTER_IN], + (struct prefix *)&p, &newinfo); + + if (ret == RMAP_DENYMATCH) { + if (IS_RIPNG_DEBUG_PACKET) + zlog_debug( + "RIPng %pFX is filtered by route-map in", + &p); + return; + } + + /* Get back the object */ + if (ripng_nexthop->flag == RIPNG_NEXTHOP_ADDRESS) { + if (!IPV6_ADDR_SAME(&newinfo.nexthop, + &ripng_nexthop->address)) { + /* the nexthop get changed by the routemap */ + if (IN6_IS_ADDR_LINKLOCAL(&newinfo.nexthop)) + ripng_nexthop->address = + newinfo.nexthop; + else + ripng_nexthop->address = in6addr_any; + } + } else { + if (!IPV6_ADDR_SAME(&newinfo.nexthop, + &from->sin6_addr)) { + /* the nexthop get changed by the routemap */ + if (IN6_IS_ADDR_LINKLOCAL(&newinfo.nexthop)) { + ripng_nexthop->flag = + RIPNG_NEXTHOP_ADDRESS; + ripng_nexthop->address = + newinfo.nexthop; + } + } + } + rte->tag = htons(newinfo.tag_out); /* XXX */ + rte->metric = newinfo.metric_out; /* XXX: the routemap uses the + metric_out field */ + } + + /* Once the entry has been validated, update the metric by + * adding the cost of the network on wich the message + * arrived. If the result is greater than infinity, use infinity + * (RFC2453 Sec. 3.9.2) + **/ + + /* Zebra ripngd can handle offset-list in. */ + ret = ripng_offset_list_apply_in(ripng, &p, ifp, &rte->metric); + + /* If offset-list does not modify the metric use interface's + * one. */ + if (!ret) + rte->metric += ifp->metric ? ifp->metric : 1; + + if (rte->metric > RIPNG_METRIC_INFINITY) + rte->metric = RIPNG_METRIC_INFINITY; + + /* Set nexthop pointer. */ + if (ripng_nexthop->flag == RIPNG_NEXTHOP_ADDRESS) + nexthop = &ripng_nexthop->address; + else + nexthop = &from->sin6_addr; + + /* Lookup RIPng routing table. */ + rp = agg_node_get(ripng->table, (struct prefix *)&p); + + newinfo.rp = rp; + newinfo.nexthop = *nexthop; + newinfo.metric = rte->metric; + newinfo.tag = ntohs(rte->tag); + + /* Check to see whether there is already RIPng route on the table. */ + if ((list = rp->info) != NULL) + for (ALL_LIST_ELEMENTS_RO(list, node, rinfo)) { + /* Need to compare with redistributed entry or local + * entry */ + if (!ripng_route_rte(rinfo)) + break; + + if (IPV6_ADDR_SAME(&rinfo->from, &from->sin6_addr) + && IPV6_ADDR_SAME(&rinfo->nexthop, nexthop)) + break; + + if (!listnextnode(node)) { + /* Not found in the list */ + + if (rte->metric > rinfo->metric) { + /* New route has a greater metric. + * Discard it. */ + agg_unlock_node(rp); + return; + } + + if (rte->metric < rinfo->metric) + /* New route has a smaller metric. + * Replace the ECMP list + * with the new one in below. */ + break; + + /* Metrics are same. Unless ECMP is disabled, + * keep "rinfo" null and + * the new route is added in the ECMP list in + * below. */ + if (!ripng->ecmp) + break; + } + } + + if (rinfo) { + /* Redistributed route check. */ + if (rinfo->type != ZEBRA_ROUTE_RIPNG + && rinfo->metric != RIPNG_METRIC_INFINITY) { + agg_unlock_node(rp); + return; + } + + /* Local static route. */ + if (rinfo->type == ZEBRA_ROUTE_RIPNG + && ((rinfo->sub_type == RIPNG_ROUTE_STATIC) + || (rinfo->sub_type == RIPNG_ROUTE_DEFAULT)) + && rinfo->metric != RIPNG_METRIC_INFINITY) { + agg_unlock_node(rp); + return; + } + } + + if (!rinfo) { + /* Now, check to see whether there is already an explicit route + for the destination prefix. If there is no such route, add + this route to the routing table, unless the metric is + infinity (there is no point in adding a route which + unusable). */ + if (rte->metric != RIPNG_METRIC_INFINITY) + ripng_ecmp_add(ripng, &newinfo); + else + agg_unlock_node(rp); + } else { + /* If there is an existing route, compare the next hop address + to the address of the router from which the datagram came. + If this datagram is from the same router as the existing + route, reinitialize the timeout. */ + same = (IN6_ARE_ADDR_EQUAL(&rinfo->from, &from->sin6_addr) + && (rinfo->ifindex == ifp->ifindex)); + + /* + * RFC 2080 - Section 2.4.2: + * "If the new metric is the same as the old one, examine the + * timeout + * for the existing route. If it is at least halfway to the + * expiration + * point, switch to the new route. This heuristic is optional, + * but + * highly recommended". + */ + if (!ripng->ecmp && !same && rinfo->metric == rte->metric && + rinfo->t_timeout && + (event_timer_remain_second(rinfo->t_timeout) < + (ripng->timeout_time / 2))) { + ripng_ecmp_replace(ripng, &newinfo); + } + /* Next, compare the metrics. If the datagram is from the same + router as the existing route, and the new metric is different + than the old one; or, if the new metric is lower than the old + one; do the following actions: */ + else if ((same && rinfo->metric != rte->metric) || + rte->metric < rinfo->metric) { + if (listcount(list) == 1) { + if (newinfo.metric != RIPNG_METRIC_INFINITY) + ripng_ecmp_replace(ripng, &newinfo); + else + ripng_ecmp_delete(ripng, rinfo); + } else { + if (newinfo.metric < rinfo->metric) + ripng_ecmp_replace(ripng, &newinfo); + else /* newinfo.metric > rinfo->metric */ + ripng_ecmp_delete(ripng, rinfo); + } + } else /* same & no change */ + ripng_timeout_update(ripng, rinfo); + + /* Unlock tempolary lock of the route. */ + agg_unlock_node(rp); + } +} + +/* Add redistributed route to RIPng table. */ +void ripng_redistribute_add(struct ripng *ripng, int type, int sub_type, + struct prefix_ipv6 *p, ifindex_t ifindex, + struct in6_addr *nexthop, route_tag_t tag) +{ + struct agg_node *rp; + struct ripng_info *rinfo = NULL, newinfo; + struct list *list = NULL; + + /* Redistribute route */ + if (IN6_IS_ADDR_LINKLOCAL(&p->prefix)) + return; + if (IN6_IS_ADDR_LOOPBACK(&p->prefix)) + return; + + rp = agg_node_get(ripng->table, (struct prefix *)p); + + memset(&newinfo, 0, sizeof(newinfo)); + newinfo.type = type; + newinfo.sub_type = sub_type; + newinfo.ifindex = ifindex; + newinfo.metric = 1; + if (tag <= UINT16_MAX) /* RIPng only supports 16 bit tags */ + newinfo.tag = tag; + newinfo.rp = rp; + if (nexthop && IN6_IS_ADDR_LINKLOCAL(nexthop)) + newinfo.nexthop = *nexthop; + + if ((list = rp->info) != NULL && listcount(list) != 0) { + rinfo = listgetdata(listhead(list)); + + if (rinfo->type == ZEBRA_ROUTE_CONNECT + && rinfo->sub_type == RIPNG_ROUTE_INTERFACE + && rinfo->metric != RIPNG_METRIC_INFINITY) { + agg_unlock_node(rp); + return; + } + + /* Manually configured RIPng route check. + * They have the precedence on all the other entries. + **/ + if (rinfo->type == ZEBRA_ROUTE_RIPNG + && ((rinfo->sub_type == RIPNG_ROUTE_STATIC) + || (rinfo->sub_type == RIPNG_ROUTE_DEFAULT))) { + if (type != ZEBRA_ROUTE_RIPNG + || ((sub_type != RIPNG_ROUTE_STATIC) + && (sub_type != RIPNG_ROUTE_DEFAULT))) { + agg_unlock_node(rp); + return; + } + } + + ripng_ecmp_replace(ripng, &newinfo); + agg_unlock_node(rp); + } else + ripng_ecmp_add(ripng, &newinfo); + + if (IS_RIPNG_DEBUG_EVENT) { + if (!nexthop) + zlog_debug( + "Redistribute new prefix %pFX on the interface %s", + p, ifindex2ifname(ifindex, ripng->vrf->vrf_id)); + else + zlog_debug( + "Redistribute new prefix %pFX with nexthop %pI6 on the interface %s", + p, nexthop, + ifindex2ifname(ifindex, ripng->vrf->vrf_id)); + } + + ripng_event(ripng, RIPNG_TRIGGERED_UPDATE, 0); +} + +/* Delete redistributed route to RIPng table. */ +void ripng_redistribute_delete(struct ripng *ripng, int type, int sub_type, + struct prefix_ipv6 *p, ifindex_t ifindex) +{ + struct agg_node *rp; + struct ripng_info *rinfo; + + if (IN6_IS_ADDR_LINKLOCAL(&p->prefix)) + return; + if (IN6_IS_ADDR_LOOPBACK(&p->prefix)) + return; + + rp = agg_node_lookup(ripng->table, (struct prefix *)p); + + if (rp) { + struct list *list = rp->info; + + if (list != NULL && listcount(list) != 0) { + rinfo = listgetdata(listhead(list)); + if (rinfo != NULL && rinfo->type == type + && rinfo->sub_type == sub_type + && rinfo->ifindex == ifindex) { + /* Perform poisoned reverse. */ + rinfo->metric = RIPNG_METRIC_INFINITY; + RIPNG_TIMER_ON(rinfo->t_garbage_collect, + ripng_garbage_collect, + ripng->garbage_time); + EVENT_OFF(rinfo->t_timeout); + + /* Aggregate count decrement. */ + ripng_aggregate_decrement(rp, rinfo); + + SET_FLAG(rinfo->flags, RIPNG_RTF_CHANGED); + + if (IS_RIPNG_DEBUG_EVENT) + zlog_debug( + "Poisone %pFX on the interface %s with an infinity metric [delete]", + p, + ifindex2ifname( + ifindex, + ripng->vrf->vrf_id)); + + ripng_event(ripng, RIPNG_TRIGGERED_UPDATE, 0); + } + } + agg_unlock_node(rp); + } +} + +/* Withdraw redistributed route. */ +void ripng_redistribute_withdraw(struct ripng *ripng, int type) +{ + struct agg_node *rp; + struct ripng_info *rinfo = NULL; + struct list *list = NULL; + + for (rp = agg_route_top(ripng->table); rp; rp = agg_route_next(rp)) + if ((list = rp->info) != NULL) { + rinfo = listgetdata(listhead(list)); + if ((rinfo->type == type) + && (rinfo->sub_type != RIPNG_ROUTE_INTERFACE)) { + /* Perform poisoned reverse. */ + rinfo->metric = RIPNG_METRIC_INFINITY; + RIPNG_TIMER_ON(rinfo->t_garbage_collect, + ripng_garbage_collect, + ripng->garbage_time); + EVENT_OFF(rinfo->t_timeout); + + /* Aggregate count decrement. */ + ripng_aggregate_decrement(rp, rinfo); + + SET_FLAG(rinfo->flags, RIPNG_RTF_CHANGED); + + if (IS_RIPNG_DEBUG_EVENT) { + struct prefix_ipv6 *p = + (struct prefix_ipv6 *) + agg_node_get_prefix(rp); + + zlog_debug( + "Poisone %pFX on the interface %s [withdraw]", + p, + ifindex2ifname( + rinfo->ifindex, + ripng->vrf->vrf_id)); + } + + ripng_event(ripng, RIPNG_TRIGGERED_UPDATE, 0); + } + } +} + +/* RIP routing information. */ +static void ripng_response_process(struct ripng_packet *packet, int size, + struct sockaddr_in6 *from, + struct interface *ifp, int hoplimit) +{ + struct ripng_interface *ri = ifp->info; + struct ripng *ripng = ri->ripng; + caddr_t lim; + struct rte *rte; + struct ripng_nexthop nexthop; + + /* RFC2080 2.4.2 Response Messages: + The Response must be ignored if it is not from the RIPng port. */ + if (ntohs(from->sin6_port) != RIPNG_PORT_DEFAULT) { + zlog_warn("RIPng packet comes from non RIPng port %d from %pI6", + ntohs(from->sin6_port), &from->sin6_addr); + ripng_peer_bad_packet(ripng, from); + return; + } + + /* The datagram's IPv6 source address should be checked to see + whether the datagram is from a valid neighbor; the source of the + datagram must be a link-local address. */ + if (!IN6_IS_ADDR_LINKLOCAL(&from->sin6_addr)) { + zlog_warn("RIPng packet comes from non link local address %pI6", + &from->sin6_addr); + ripng_peer_bad_packet(ripng, from); + return; + } + + /* It is also worth checking to see whether the response is from one + of the router's own addresses. Interfaces on broadcast networks + may receive copies of their own multicasts immediately. If a + router processes its own output as new input, confusion is likely, + and such datagrams must be ignored. */ + if (ripng_lladdr_check(ifp, &from->sin6_addr)) { + zlog_warn( + "RIPng packet comes from my own link local address %pI6", + &from->sin6_addr); + ripng_peer_bad_packet(ripng, from); + return; + } + + /* As an additional check, periodic advertisements must have their + hop counts set to 255, and inbound, multicast packets sent from the + RIPng port (i.e. periodic advertisement or triggered update + packets) must be examined to ensure that the hop count is 255. */ + if (hoplimit >= 0 && hoplimit != 255) { + zlog_warn( + "RIPng packet comes with non 255 hop count %d from %pI6", + hoplimit, &from->sin6_addr); + ripng_peer_bad_packet(ripng, from); + return; + } + + /* Update RIPng peer. */ + ripng_peer_update(ripng, from, packet->version); + + /* Reset nexthop. */ + memset(&nexthop, 0, sizeof(nexthop)); + nexthop.flag = RIPNG_NEXTHOP_UNSPEC; + + /* Set RTE pointer. */ + rte = packet->rte; + + for (lim = ((caddr_t)packet) + size; (caddr_t)rte < lim; rte++) { + /* First of all, we have to check this RTE is next hop RTE or + not. Next hop RTE is completely different with normal RTE so + we need special treatment. */ + if (rte->metric == RIPNG_METRIC_NEXTHOP) { + ripng_nexthop_rte(rte, from, &nexthop); + continue; + } + + /* RTE information validation. */ + + /* - is the destination prefix valid (e.g., not a multicast + prefix and not a link-local address) A link-local address + should never be present in an RTE. */ + if (IN6_IS_ADDR_MULTICAST(&rte->addr)) { + zlog_warn( + "Destination prefix is a multicast address %pI6/%d [%d]", + &rte->addr, rte->prefixlen, rte->metric); + ripng_peer_bad_route(ripng, from); + continue; + } + if (IN6_IS_ADDR_LINKLOCAL(&rte->addr)) { + zlog_warn( + "Destination prefix is a link-local address %pI6/%d [%d]", + &rte->addr, rte->prefixlen, rte->metric); + ripng_peer_bad_route(ripng, from); + continue; + } + if (IN6_IS_ADDR_LOOPBACK(&rte->addr)) { + zlog_warn( + "Destination prefix is a loopback address %pI6/%d [%d]", + &rte->addr, rte->prefixlen, rte->metric); + ripng_peer_bad_route(ripng, from); + continue; + } + + /* - is the prefix length valid (i.e., between 0 and 128, + inclusive) */ + if (rte->prefixlen > IPV6_MAX_BITLEN) { + zlog_warn("Invalid prefix length %pI6/%d from %pI6%%%s", + &rte->addr, rte->prefixlen, + &from->sin6_addr, ifp->name); + ripng_peer_bad_route(ripng, from); + continue; + } + + /* - is the metric valid (i.e., between 1 and 16, inclusive) */ + if (!(rte->metric >= 1 && rte->metric <= 16)) { + zlog_warn("Invalid metric %d from %pI6%%%s", + rte->metric, &from->sin6_addr, ifp->name); + ripng_peer_bad_route(ripng, from); + continue; + } + + /* Vincent: XXX Should we compute the direclty reachable nexthop + * for our RIPng network ? + **/ + + /* Routing table updates. */ + ripng_route_process(rte, from, &nexthop, ifp); + } +} + +/* Response to request message. */ +static void ripng_request_process(struct ripng_packet *packet, int size, + struct sockaddr_in6 *from, + struct interface *ifp) +{ + struct ripng *ripng; + caddr_t lim; + struct rte *rte; + struct prefix_ipv6 p; + struct agg_node *rp; + struct ripng_info *rinfo; + struct ripng_interface *ri; + + /* Does not reponse to the requests on the loopback interfaces */ + if (if_is_loopback(ifp)) + return; + + /* Check RIPng process is enabled on this interface. */ + ri = ifp->info; + if (!ri->running) + return; + ripng = ri->ripng; + + /* When passive interface is specified, suppress responses */ + if (ri->passive) + return; + + /* RIPng peer update. */ + ripng_peer_update(ripng, from, packet->version); + + lim = ((caddr_t)packet) + size; + rte = packet->rte; + + /* The Request is processed entry by entry. If there are no + entries, no response is given. */ + if (lim == (caddr_t)rte) + return; + + /* There is one special case. If there is exactly one entry in the + request, and it has a destination prefix of zero, a prefix length + of zero, and a metric of infinity (i.e., 16), then this is a + request to send the entire routing table. In that case, a call + is made to the output process to send the routing table to the + requesting address/port. */ + if (lim == ((caddr_t)(rte + 1)) && IN6_IS_ADDR_UNSPECIFIED(&rte->addr) + && rte->prefixlen == 0 && rte->metric == RIPNG_METRIC_INFINITY) { + /* All route with split horizon */ + ripng_output_process(ifp, from, ripng_all_route); + } else { + /* Except for this special case, processing is quite simple. + Examine the list of RTEs in the Request one by one. For each + entry, look up the destination in the router's routing + database and, if there is a route, put that route's metric in + the metric field of the RTE. If there is no explicit route + to the specified destination, put infinity in the metric + field. Once all the entries have been filled in, change the + command from Request to Response and send the datagram back + to the requestor. */ + memset(&p, 0, sizeof(p)); + p.family = AF_INET6; + + for (; ((caddr_t)rte) < lim; rte++) { + p.prefix = rte->addr; + p.prefixlen = rte->prefixlen; + apply_mask_ipv6(&p); + + rp = agg_node_lookup(ripng->table, (struct prefix *)&p); + + if (rp) { + rinfo = listgetdata( + listhead((struct list *)rp->info)); + rte->metric = rinfo->metric; + agg_unlock_node(rp); + } else + rte->metric = RIPNG_METRIC_INFINITY; + } + packet->command = RIPNG_RESPONSE; + + ripng_send_packet((caddr_t)packet, size, from, ifp); + } +} + +/* First entry point of reading RIPng packet. */ +static void ripng_read(struct event *thread) +{ + struct ripng *ripng = EVENT_ARG(thread); + int len; + int sock; + struct sockaddr_in6 from; + struct ripng_packet *packet; + ifindex_t ifindex = 0; + struct interface *ifp; + int hoplimit = -1; + + /* Check ripng is active and alive. */ + assert(ripng != NULL); + assert(ripng->sock >= 0); + + /* Fetch thread data and set read pointer to empty for event + managing. `sock' sould be same as ripng->sock. */ + sock = EVENT_FD(thread); + + /* Add myself to the next event. */ + ripng_event(ripng, RIPNG_READ, sock); + + /* Read RIPng packet. */ + len = ripng_recv_packet(sock, STREAM_DATA(ripng->ibuf), + STREAM_SIZE(ripng->ibuf), &from, &ifindex, + &hoplimit); + if (len < 0) { + zlog_warn("RIPng recvfrom failed (VRF %s): %s.", + ripng->vrf_name, safe_strerror(errno)); + return; + } + + /* Check RTE boundary. RTE size (Packet length - RIPng header size + (4)) must be multiple size of one RTE size (20). */ + if (((len - 4) % 20) != 0) { + zlog_warn("RIPng invalid packet size %d from %pI6 (VRF %s)", + len, &from.sin6_addr, ripng->vrf_name); + ripng_peer_bad_packet(ripng, &from); + return; + } + + packet = (struct ripng_packet *)STREAM_DATA(ripng->ibuf); + ifp = if_lookup_by_index(ifindex, ripng->vrf->vrf_id); + + /* RIPng packet received. */ + if (IS_RIPNG_DEBUG_EVENT) + zlog_debug( + "RIPng packet received from %pI6 port %d on %s (VRF %s)", + &from.sin6_addr, ntohs(from.sin6_port), + ifp ? ifp->name : "unknown", ripng->vrf_name); + + /* Logging before packet checking. */ + if (IS_RIPNG_DEBUG_RECV) + ripng_packet_dump(packet, len, "RECV"); + + /* Packet comes from unknown interface. */ + if (ifp == NULL) { + zlog_warn( + "RIPng packet comes from unknown interface %d (VRF %s)", + ifindex, ripng->vrf_name); + return; + } + + /* Packet version mismatch checking. */ + if (packet->version != ripng->version) { + zlog_warn( + "RIPng packet version %d doesn't fit to my version %d (VRF %s)", + packet->version, ripng->version, ripng->vrf_name); + ripng_peer_bad_packet(ripng, &from); + return; + } + + /* Process RIPng packet. */ + switch (packet->command) { + case RIPNG_REQUEST: + ripng_request_process(packet, len, &from, ifp); + break; + case RIPNG_RESPONSE: + ripng_response_process(packet, len, &from, ifp, hoplimit); + break; + default: + zlog_warn("Invalid RIPng command %d (VRF %s)", packet->command, + ripng->vrf_name); + ripng_peer_bad_packet(ripng, &from); + break; + } +} + +/* Walk down the RIPng routing table then clear changed flag. */ +static void ripng_clear_changed_flag(struct ripng *ripng) +{ + struct agg_node *rp; + struct ripng_info *rinfo = NULL; + struct list *list = NULL; + struct listnode *listnode = NULL; + + for (rp = agg_route_top(ripng->table); rp; rp = agg_route_next(rp)) + if ((list = rp->info) != NULL) + for (ALL_LIST_ELEMENTS_RO(list, listnode, rinfo)) { + UNSET_FLAG(rinfo->flags, RIPNG_RTF_CHANGED); + /* This flag can be set only on the first entry. + */ + break; + } +} + +/* Regular update of RIPng route. Send all routing formation to RIPng + enabled interface. */ +static void ripng_update(struct event *t) +{ + struct ripng *ripng = EVENT_ARG(t); + struct interface *ifp; + struct ripng_interface *ri; + + /* Logging update event. */ + if (IS_RIPNG_DEBUG_EVENT) + zlog_debug("RIPng update timer expired!"); + + /* Supply routes to each interface. */ + FOR_ALL_INTERFACES (ripng->vrf, ifp) { + ri = ifp->info; + + if (if_is_loopback(ifp) || !if_is_up(ifp)) + continue; + + if (!ri->running) + continue; + + /* When passive interface is specified, suppress announce to the + interface. */ + if (ri->passive) + continue; + +#ifdef RIPNG_ADVANCED + if (ri->ri_send == RIPNG_SEND_OFF) { + if (IS_RIPNG_DEBUG_EVENT) + zlog_debug( + "[Event] RIPng send to if %d is suppressed by config", + ifp->ifindex); + continue; + } +#endif /* RIPNG_ADVANCED */ + + ripng_output_process(ifp, NULL, ripng_all_route); + } + + /* Triggered updates may be suppressed if a regular update is due by + the time the triggered update would be sent. */ + EVENT_OFF(ripng->t_triggered_interval); + ripng->trigger = 0; + + /* Reset flush event. */ + ripng_event(ripng, RIPNG_UPDATE_EVENT, 0); +} + +/* Triggered update interval timer. */ +static void ripng_triggered_interval(struct event *t) +{ + struct ripng *ripng = EVENT_ARG(t); + + if (ripng->trigger) { + ripng->trigger = 0; + ripng_triggered_update(t); + } +} + +/* Execute triggered update. */ +void ripng_triggered_update(struct event *t) +{ + struct ripng *ripng = EVENT_ARG(t); + struct interface *ifp; + struct ripng_interface *ri; + int interval; + + /* Cancel interval timer. */ + EVENT_OFF(ripng->t_triggered_interval); + ripng->trigger = 0; + + /* Logging triggered update. */ + if (IS_RIPNG_DEBUG_EVENT) + zlog_debug("RIPng triggered update!"); + + /* Split Horizon processing is done when generating triggered + updates as well as normal updates (see section 2.6). */ + FOR_ALL_INTERFACES (ripng->vrf, ifp) { + ri = ifp->info; + + if (if_is_loopback(ifp) || !if_is_up(ifp)) + continue; + + if (!ri->running) + continue; + + /* When passive interface is specified, suppress announce to the + interface. */ + if (ri->passive) + continue; + + ripng_output_process(ifp, NULL, ripng_changed_route); + } + + /* Once all of the triggered updates have been generated, the route + change flags should be cleared. */ + ripng_clear_changed_flag(ripng); + + /* After a triggered update is sent, a timer should be set for a + random interval between 1 and 5 seconds. If other changes that + would trigger updates occur before the timer expires, a single + update is triggered when the timer expires. */ + interval = (frr_weak_random() % 5) + 1; + + event_add_timer(master, ripng_triggered_interval, ripng, interval, + &ripng->t_triggered_interval); +} + +/* Write routing table entry to the stream and return next index of + the routing table entry in the stream. */ +int ripng_write_rte(int num, struct stream *s, struct prefix_ipv6 *p, + struct in6_addr *nexthop, uint16_t tag, uint8_t metric) +{ + /* RIPng packet header. */ + if (num == 0) { + stream_putc(s, RIPNG_RESPONSE); + stream_putc(s, RIPNG_V1); + stream_putw(s, 0); + } + + /* Write routing table entry. */ + if (!nexthop) { + assert(p); + stream_write(s, (uint8_t *)&p->prefix, sizeof(struct in6_addr)); + } else + stream_write(s, (uint8_t *)nexthop, sizeof(struct in6_addr)); + stream_putw(s, tag); + if (p) + stream_putc(s, p->prefixlen); + else + stream_putc(s, 0); + stream_putc(s, metric); + + return ++num; +} + +/* Send RESPONSE message to specified destination. */ +void ripng_output_process(struct interface *ifp, struct sockaddr_in6 *to, + int route_type) +{ + struct ripng *ripng; + int ret; + struct agg_node *rp; + struct ripng_info *rinfo; + struct ripng_interface *ri; + struct ripng_aggregate *aggregate; + struct prefix_ipv6 *p; + struct list *ripng_rte_list; + struct list *list = NULL; + struct listnode *listnode = NULL; + + if (IS_RIPNG_DEBUG_EVENT) { + if (to) + zlog_debug("RIPng update routes to neighbor %pI6", + &to->sin6_addr); + else + zlog_debug("RIPng update routes on interface %s", + ifp->name); + } + + /* Get RIPng interface and instance. */ + ri = ifp->info; + ripng = ri->ripng; + + ripng_rte_list = ripng_rte_new(); + + for (rp = agg_route_top(ripng->table); rp; rp = agg_route_next(rp)) { + if ((list = rp->info) != NULL + && (rinfo = listgetdata(listhead(list))) != NULL + && rinfo->suppress == 0) { + /* If no route-map are applied, the RTE will be these + * following + * information. + */ + p = (struct prefix_ipv6 *)agg_node_get_prefix(rp); + rinfo->metric_out = rinfo->metric; + rinfo->tag_out = rinfo->tag; + memset(&rinfo->nexthop_out, 0, + sizeof(rinfo->nexthop_out)); + /* In order to avoid some local loops, + * if the RIPng route has a nexthop via this interface, + * keep the nexthop, + * otherwise set it to 0. The nexthop should not be + * propagated + * beyond the local broadcast/multicast area in order + * to avoid an IGP multi-level recursive look-up. + */ + if (rinfo->ifindex == ifp->ifindex) + rinfo->nexthop_out = rinfo->nexthop; + + /* Apply output filters. */ + ret = ripng_filter(RIPNG_FILTER_OUT, p, ri); + if (ret < 0) + continue; + + /* Changed route only output. */ + if (route_type == ripng_changed_route && + (!CHECK_FLAG(rinfo->flags, RIPNG_RTF_CHANGED))) + continue; + + /* Split horizon. */ + if (ri->split_horizon == RIPNG_SPLIT_HORIZON) { + /* We perform split horizon for RIPng routes. */ + int suppress = 0; + struct ripng_info *tmp_rinfo = NULL; + + for (ALL_LIST_ELEMENTS_RO(list, listnode, + tmp_rinfo)) + if (tmp_rinfo->type == + ZEBRA_ROUTE_RIPNG && + tmp_rinfo->ifindex == + ifp->ifindex) { + suppress = 1; + break; + } + if (suppress) + continue; + } + + /* Preparation for route-map. */ + rinfo->metric_set = 0; + /* nexthop_out, + * metric_out + * and tag_out are already initialized. + */ + + /* Interface route-map */ + if (ri->routemap[RIPNG_FILTER_OUT]) { + ret = route_map_apply( + ri->routemap[RIPNG_FILTER_OUT], + (struct prefix *)p, rinfo); + + if (ret == RMAP_DENYMATCH) { + if (IS_RIPNG_DEBUG_PACKET) + zlog_debug( + "RIPng %pFX is filtered by route-map out", + p); + continue; + } + } + + /* Redistribute route-map. */ + if (ripng->redist[rinfo->type].route_map.name) { + ret = route_map_apply(ripng->redist[rinfo->type] + .route_map.map, + (struct prefix *)p, + rinfo); + + if (ret == RMAP_DENYMATCH) { + if (IS_RIPNG_DEBUG_PACKET) + zlog_debug( + "RIPng %pFX is filtered by route-map", + p); + continue; + } + } + + /* When the route-map does not set metric. */ + if (!rinfo->metric_set) { + /* If the redistribute metric is set. */ + if (ripng->redist[rinfo->type].metric_config + && rinfo->metric != RIPNG_METRIC_INFINITY) { + rinfo->metric_out = + ripng->redist[rinfo->type] + .metric; + } else { + /* If the route is not connected or + localy generated + one, use default-metric value */ + if (rinfo->type != ZEBRA_ROUTE_RIPNG && + rinfo->type != + ZEBRA_ROUTE_CONNECT && + rinfo->metric != + RIPNG_METRIC_INFINITY) + rinfo->metric_out = + ripng->default_metric; + } + } + + /* Apply offset-list */ + if (rinfo->metric_out != RIPNG_METRIC_INFINITY) + ripng_offset_list_apply_out(ripng, p, ifp, + &rinfo->metric_out); + + if (rinfo->metric_out > RIPNG_METRIC_INFINITY) + rinfo->metric_out = RIPNG_METRIC_INFINITY; + + /* Perform split-horizon with poisoned reverse + * for RIPng routes. + **/ + if (ri->split_horizon == + RIPNG_SPLIT_HORIZON_POISONED_REVERSE) { + struct ripng_info *tmp_rinfo = NULL; + + for (ALL_LIST_ELEMENTS_RO(list, listnode, + tmp_rinfo)) + if ((tmp_rinfo->type == + ZEBRA_ROUTE_RIPNG) && + tmp_rinfo->ifindex == ifp->ifindex) + rinfo->metric_out = + RIPNG_METRIC_INFINITY; + } + + /* Add RTE to the list */ + ripng_rte_add(ripng_rte_list, p, rinfo, NULL); + } + + /* Process the aggregated RTE entry */ + if ((aggregate = rp->aggregate) != NULL && aggregate->count > 0 + && aggregate->suppress == 0) { + /* If no route-map are applied, the RTE will be these + * following + * information. + */ + p = (struct prefix_ipv6 *)agg_node_get_prefix(rp); + aggregate->metric_set = 0; + aggregate->metric_out = aggregate->metric; + aggregate->tag_out = aggregate->tag; + memset(&aggregate->nexthop_out, 0, + sizeof(aggregate->nexthop_out)); + + /* Apply output filters.*/ + ret = ripng_filter(RIPNG_FILTER_OUT, p, ri); + if (ret < 0) + continue; + + /* Interface route-map */ + if (ri->routemap[RIPNG_FILTER_OUT]) { + struct ripng_info newinfo; + + /* let's cast the aggregate structure to + * ripng_info */ + memset(&newinfo, 0, sizeof(struct ripng_info)); + /* the nexthop is :: */ + newinfo.metric = aggregate->metric; + newinfo.metric_out = aggregate->metric_out; + newinfo.tag = aggregate->tag; + newinfo.tag_out = aggregate->tag_out; + + ret = route_map_apply( + ri->routemap[RIPNG_FILTER_OUT], + (struct prefix *)p, &newinfo); + + if (ret == RMAP_DENYMATCH) { + if (IS_RIPNG_DEBUG_PACKET) + zlog_debug( + "RIPng %pFX is filtered by route-map out", + p); + continue; + } + + aggregate->metric_out = newinfo.metric_out; + aggregate->tag_out = newinfo.tag_out; + if (IN6_IS_ADDR_LINKLOCAL(&newinfo.nexthop_out)) + aggregate->nexthop_out = + newinfo.nexthop_out; + } + + /* There is no redistribute routemap for the aggregated + * RTE */ + + /* Changed route only output. */ + /* XXX, vincent, in order to increase time convergence, + * it should be announced if a child has changed. + */ + if (route_type == ripng_changed_route) + continue; + + /* Apply offset-list */ + if (aggregate->metric_out != RIPNG_METRIC_INFINITY) + ripng_offset_list_apply_out( + ripng, p, ifp, &aggregate->metric_out); + + if (aggregate->metric_out > RIPNG_METRIC_INFINITY) + aggregate->metric_out = RIPNG_METRIC_INFINITY; + + /* Add RTE to the list */ + ripng_rte_add(ripng_rte_list, p, NULL, aggregate); + } + } + + /* Flush the list */ + ripng_rte_send(ripng_rte_list, ifp, to); + ripng_rte_free(ripng_rte_list); +} + +struct ripng *ripng_lookup_by_vrf_id(vrf_id_t vrf_id) +{ + struct vrf *vrf; + + vrf = vrf_lookup_by_id(vrf_id); + if (!vrf) + return NULL; + + return vrf->info; +} + +struct ripng *ripng_lookup_by_vrf_name(const char *vrf_name) +{ + struct ripng ripng; + + ripng.vrf_name = (char *)vrf_name; + + return RB_FIND(ripng_instance_head, &ripng_instances, &ripng); +} + +/* Create new RIPng instance and set it to global variable. */ +struct ripng *ripng_create(const char *vrf_name, struct vrf *vrf, int socket) +{ + struct ripng *ripng; + + /* Allocaste RIPng instance. */ + ripng = XCALLOC(MTYPE_RIPNG, sizeof(struct ripng)); + ripng->vrf_name = XSTRDUP(MTYPE_RIPNG_VRF_NAME, vrf_name); + + /* Default version and timer values. */ + ripng->version = RIPNG_V1; + ripng->update_time = yang_get_default_uint32( + "%s/timers/update-interval", RIPNG_INSTANCE); + ripng->timeout_time = yang_get_default_uint32( + "%s/timers/holddown-interval", RIPNG_INSTANCE); + ripng->garbage_time = yang_get_default_uint32( + "%s/timers/flush-interval", RIPNG_INSTANCE); + ripng->default_metric = + yang_get_default_uint8("%s/default-metric", RIPNG_INSTANCE); + ripng->ecmp = yang_get_default_uint8("%s/allow-ecmp", RIPNG_INSTANCE); + + /* Make buffer. */ + ripng->ibuf = stream_new(RIPNG_MAX_PACKET_SIZE * 5); + ripng->obuf = stream_new(RIPNG_MAX_PACKET_SIZE); + + /* Initialize RIPng data structures. */ + ripng->table = agg_table_init(); + agg_set_table_info(ripng->table, ripng); + ripng->peer_list = list_new(); + ripng->peer_list->cmp = (int (*)(void *, void *))ripng_peer_list_cmp; + ripng->peer_list->del = ripng_peer_list_del; + ripng->enable_if = vector_init(1); + ripng->enable_network = agg_table_init(); + ripng->passive_interface = vector_init(1); + ripng->offset_list_master = list_new(); + ripng->offset_list_master->cmp = + (int (*)(void *, void *))offset_list_cmp; + ripng->offset_list_master->del = + (void (*)(void *))ripng_offset_list_free; + ripng->distribute_ctx = distribute_list_ctx_create(vrf); + distribute_list_add_hook(ripng->distribute_ctx, + ripng_distribute_update); + distribute_list_delete_hook(ripng->distribute_ctx, + ripng_distribute_update); + + /* if rmap install. */ + ripng->if_rmap_ctx = if_rmap_ctx_create(vrf_name); + if_rmap_hook_add(ripng->if_rmap_ctx, ripng_if_rmap_update); + if_rmap_hook_delete(ripng->if_rmap_ctx, ripng_if_rmap_update); + + /* Enable the routing instance if possible. */ + if (vrf && vrf_is_enabled(vrf)) + ripng_instance_enable(ripng, vrf, socket); + else { + ripng->vrf = NULL; + ripng->sock = -1; + } + + RB_INSERT(ripng_instance_head, &ripng_instances, ripng); + + return ripng; +} + +/* Send RIPng request to the interface. */ +int ripng_request(struct interface *ifp) +{ + struct rte *rte; + struct ripng_packet ripng_packet; + + /* In default ripd doesn't send RIP_REQUEST to the loopback interface. + */ + if (if_is_loopback(ifp)) + return 0; + + /* If interface is down, don't send RIP packet. */ + if (!if_is_up(ifp)) + return 0; + + if (IS_RIPNG_DEBUG_EVENT) + zlog_debug("RIPng send request to %s", ifp->name); + + memset(&ripng_packet, 0, sizeof(ripng_packet)); + ripng_packet.command = RIPNG_REQUEST; + ripng_packet.version = RIPNG_V1; + rte = ripng_packet.rte; + rte->metric = RIPNG_METRIC_INFINITY; + + return ripng_send_packet((caddr_t)&ripng_packet, sizeof(ripng_packet), + NULL, ifp); +} + + +static int ripng_update_jitter(int time) +{ + return ((frr_weak_random() % (time + 1)) - (time / 2)); +} + +void ripng_event(struct ripng *ripng, enum ripng_event event, int sock) +{ + int jitter = 0; + + switch (event) { + case RIPNG_READ: + event_add_read(master, ripng_read, ripng, sock, &ripng->t_read); + break; + case RIPNG_UPDATE_EVENT: + EVENT_OFF(ripng->t_update); + + /* Update timer jitter. */ + jitter = ripng_update_jitter(ripng->update_time); + + event_add_timer(master, ripng_update, ripng, + sock ? 2 : ripng->update_time + jitter, + &ripng->t_update); + break; + case RIPNG_TRIGGERED_UPDATE: + if (ripng->t_triggered_interval) + ripng->trigger = 1; + else + event_add_event(master, ripng_triggered_update, ripng, + 0, &ripng->t_triggered_update); + break; + case RIPNG_ZEBRA: + case RIPNG_REQUEST_EVENT: + break; + } +} + + +/* Print out routes update time. */ +static void ripng_vty_out_uptime(struct vty *vty, struct ripng_info *rinfo) +{ + time_t clock; + struct tm tm; +#define TIME_BUF 25 + char timebuf[TIME_BUF]; + struct event *thread; + + if ((thread = rinfo->t_timeout) != NULL) { + clock = event_timer_remain_second(thread); + gmtime_r(&clock, &tm); + strftime(timebuf, TIME_BUF, "%M:%S", &tm); + vty_out(vty, "%5s", timebuf); + } else if ((thread = rinfo->t_garbage_collect) != NULL) { + clock = event_timer_remain_second(thread); + gmtime_r(&clock, &tm); + strftime(timebuf, TIME_BUF, "%M:%S", &tm); + vty_out(vty, "%5s", timebuf); + } +} + +static char *ripng_route_subtype_print(struct ripng_info *rinfo) +{ + static char str[3]; + memset(str, 0, 3); + + if (rinfo->suppress) + strlcat(str, "S", sizeof(str)); + + switch (rinfo->sub_type) { + case RIPNG_ROUTE_RTE: + strlcat(str, "n", sizeof(str)); + break; + case RIPNG_ROUTE_STATIC: + strlcat(str, "s", sizeof(str)); + break; + case RIPNG_ROUTE_DEFAULT: + strlcat(str, "d", sizeof(str)); + break; + case RIPNG_ROUTE_REDISTRIBUTE: + strlcat(str, "r", sizeof(str)); + break; + case RIPNG_ROUTE_INTERFACE: + strlcat(str, "i", sizeof(str)); + break; + default: + strlcat(str, "?", sizeof(str)); + break; + } + + return str; +} + +DEFUN (show_ipv6_ripng, + show_ipv6_ripng_cmd, + "show ipv6 ripng [vrf NAME]", + SHOW_STR + IPV6_STR + "Show RIPng routes\n" + VRF_CMD_HELP_STR) +{ + struct ripng *ripng; + struct agg_node *rp; + struct ripng_info *rinfo; + struct ripng_aggregate *aggregate; + struct list *list = NULL; + struct listnode *listnode = NULL; + int len; + const char *vrf_name; + int idx = 0; + + if (argv_find(argv, argc, "vrf", &idx)) + vrf_name = argv[idx + 1]->arg; + else + vrf_name = VRF_DEFAULT_NAME; + + ripng = ripng_lookup_by_vrf_name(vrf_name); + if (!ripng) { + vty_out(vty, "%% RIPng instance not found\n"); + return CMD_SUCCESS; + } + if (!ripng->enabled) { + vty_out(vty, "%% RIPng instance is disabled\n"); + return CMD_SUCCESS; + } + + /* Header of display. */ + vty_out(vty, + "Codes: R - RIPng, C - connected, S - Static, O - OSPF, B - BGP\n" + "Sub-codes:\n" + " (n) - normal, (s) - static, (d) - default, (r) - redistribute,\n" + " (i) - interface, (a/S) - aggregated/Suppressed\n\n" + " Network Next Hop Via Metric Tag Time\n"); + + for (rp = agg_route_top(ripng->table); rp; rp = agg_route_next(rp)) { + if ((aggregate = rp->aggregate) != NULL) { +#ifdef DEBUG + vty_out(vty, "R(a) %d/%d %pRN ", aggregate->count, + aggregate->suppress, rp); +#else + vty_out(vty, "R(a) %pRN ", rp); +#endif /* DEBUG */ + vty_out(vty, "\n"); + vty_out(vty, "%*s", 18, " "); + + vty_out(vty, "%*s", 28, " "); + vty_out(vty, "self %2d %3" ROUTE_TAG_PRI "\n", + aggregate->metric, (route_tag_t)aggregate->tag); + } + + if ((list = rp->info) != NULL) + for (ALL_LIST_ELEMENTS_RO(list, listnode, rinfo)) { +#ifdef DEBUG + vty_out(vty, "%c(%s) 0/%d %pRN ", + zebra_route_char(rinfo->type), + ripng_route_subtype_print(rinfo), + rinfo->suppress, rp); +#else + vty_out(vty, "%c(%s) %pRN ", + zebra_route_char(rinfo->type), + ripng_route_subtype_print(rinfo), rp); +#endif /* DEBUG */ + vty_out(vty, "\n"); + vty_out(vty, "%*s", 18, " "); + len = vty_out(vty, "%pI6", + &rinfo->nexthop); + + len = 28 - len; + if (len > 0) + vty_out(vty, "%*s", len, " "); + + /* from */ + if ((rinfo->type == ZEBRA_ROUTE_RIPNG) + && (rinfo->sub_type == RIPNG_ROUTE_RTE)) { + len = vty_out( + vty, "%s", + ifindex2ifname( + rinfo->ifindex, + ripng->vrf->vrf_id)); + } else if (rinfo->metric + == RIPNG_METRIC_INFINITY) { + len = vty_out(vty, "kill"); + } else + len = vty_out(vty, "self"); + + len = 9 - len; + if (len > 0) + vty_out(vty, "%*s", len, " "); + + vty_out(vty, " %2d %3" ROUTE_TAG_PRI " ", + rinfo->metric, (route_tag_t)rinfo->tag); + + /* time */ + if ((rinfo->type == ZEBRA_ROUTE_RIPNG) + && (rinfo->sub_type == RIPNG_ROUTE_RTE)) { + /* RTE from remote RIP routers */ + ripng_vty_out_uptime(vty, rinfo); + } else if (rinfo->metric + == RIPNG_METRIC_INFINITY) { + /* poisonous reversed routes (gc) */ + ripng_vty_out_uptime(vty, rinfo); + } + + vty_out(vty, "\n"); + } + } + + return CMD_SUCCESS; +} + +DEFUN (show_ipv6_ripng_status, + show_ipv6_ripng_status_cmd, + "show ipv6 ripng [vrf NAME] status", + SHOW_STR + IPV6_STR + "Show RIPng routes\n" + VRF_CMD_HELP_STR + "IPv6 routing protocol process parameters and statistics\n") +{ + struct ripng *ripng; + struct interface *ifp; + const char *vrf_name; + int idx = 0; + + if (argv_find(argv, argc, "vrf", &idx)) + vrf_name = argv[idx + 1]->arg; + else + vrf_name = VRF_DEFAULT_NAME; + + ripng = ripng_lookup_by_vrf_name(vrf_name); + if (!ripng) { + vty_out(vty, "%% RIPng instance not found\n"); + return CMD_SUCCESS; + } + if (!ripng->enabled) { + vty_out(vty, "%% RIPng instance is disabled\n"); + return CMD_SUCCESS; + } + + vty_out(vty, "Routing Protocol is \"RIPng\"\n"); + vty_out(vty, " Sending updates every %u seconds with +/-50%%,", + ripng->update_time); + vty_out(vty, " next due in %lu seconds\n", + event_timer_remain_second(ripng->t_update)); + vty_out(vty, " Timeout after %u seconds,", ripng->timeout_time); + vty_out(vty, " garbage collect after %u seconds\n", + ripng->garbage_time); + + /* Filtering status show. */ + config_show_distribute(vty, ripng->distribute_ctx); + + /* Default metric information. */ + vty_out(vty, " Default redistribution metric is %d\n", + ripng->default_metric); + + /* Redistribute information. */ + vty_out(vty, " Redistributing:"); + ripng_redistribute_write(vty, ripng); + vty_out(vty, "\n"); + + vty_out(vty, " Default version control: send version %d,", + ripng->version); + vty_out(vty, " receive version %d \n", ripng->version); + + vty_out(vty, " Interface Send Recv\n"); + + FOR_ALL_INTERFACES (ripng->vrf, ifp) { + struct ripng_interface *ri; + + ri = ifp->info; + + if (ri->enable_network || ri->enable_interface) { + + vty_out(vty, " %-17s%-3d %-3d\n", ifp->name, + ripng->version, ripng->version); + } + } + + vty_out(vty, " Routing for Networks:\n"); + ripng_network_write(vty, ripng); + + vty_out(vty, " Routing Information Sources:\n"); + vty_out(vty, + " Gateway BadPackets BadRoutes Distance Last Update\n"); + ripng_peer_display(vty, ripng); + + return CMD_SUCCESS; +} + +/* Update ECMP routes to zebra when ECMP is disabled. */ +void ripng_ecmp_disable(struct ripng *ripng) +{ + struct agg_node *rp; + struct ripng_info *rinfo, *tmp_rinfo; + struct list *list; + struct listnode *node, *nextnode; + + if (!ripng) + return; + + for (rp = agg_route_top(ripng->table); rp; rp = agg_route_next(rp)) + if ((list = rp->info) != NULL && listcount(list) > 1) { + rinfo = listgetdata(listhead(list)); + if (!ripng_route_rte(rinfo)) + continue; + + /* Drop all other entries, except the first one. */ + for (ALL_LIST_ELEMENTS(list, node, nextnode, tmp_rinfo)) + if (tmp_rinfo != rinfo) { + EVENT_OFF(tmp_rinfo->t_timeout); + EVENT_OFF(tmp_rinfo->t_garbage_collect); + list_delete_node(list, node); + ripng_info_free(tmp_rinfo); + } + + /* Update zebra. */ + ripng_zebra_ipv6_add(ripng, rp); + + /* Set the route change flag. */ + SET_FLAG(rinfo->flags, RIPNG_RTF_CHANGED); + + /* Signal the output process to trigger an update. */ + ripng_event(ripng, RIPNG_TRIGGERED_UPDATE, 0); + } +} + +/* RIPng configuration write function. */ +static int ripng_config_write(struct vty *vty) +{ + struct ripng *ripng; + int write = 0; + + RB_FOREACH(ripng, ripng_instance_head, &ripng_instances) { + char xpath[XPATH_MAXLEN]; + struct lyd_node *dnode; + + snprintf(xpath, sizeof(xpath), + "/frr-ripngd:ripngd/instance[vrf='%s']", + ripng->vrf_name); + + dnode = yang_dnode_get(running_config->dnode, xpath); + assert(dnode); + + nb_cli_show_dnode_cmds(vty, dnode, false); + + config_write_distribute(vty, ripng->distribute_ctx); + + vty_out(vty, "exit\n"); + + write = 1; + } + + return write; +} + +static int ripng_config_write(struct vty *vty); +/* RIPng node structure. */ +static struct cmd_node cmd_ripng_node = { + .name = "ripng", + .node = RIPNG_NODE, + .parent_node = CONFIG_NODE, + .prompt = "%s(config-router)# ", + .config_write = ripng_config_write, +}; + +static void ripng_distribute_update(struct distribute_ctx *ctx, + struct distribute *dist) +{ + struct interface *ifp; + struct ripng_interface *ri; + struct access_list *alist; + struct prefix_list *plist; + + if (!ctx->vrf || !dist->ifname) + return; + + ifp = if_lookup_by_name(dist->ifname, ctx->vrf->vrf_id); + if (ifp == NULL) + return; + + ri = ifp->info; + + if (dist->list[DISTRIBUTE_V6_IN]) { + alist = access_list_lookup(AFI_IP6, + dist->list[DISTRIBUTE_V6_IN]); + if (alist) + ri->list[RIPNG_FILTER_IN] = alist; + else + ri->list[RIPNG_FILTER_IN] = NULL; + } else + ri->list[RIPNG_FILTER_IN] = NULL; + + if (dist->list[DISTRIBUTE_V6_OUT]) { + alist = access_list_lookup(AFI_IP6, + dist->list[DISTRIBUTE_V6_OUT]); + if (alist) + ri->list[RIPNG_FILTER_OUT] = alist; + else + ri->list[RIPNG_FILTER_OUT] = NULL; + } else + ri->list[RIPNG_FILTER_OUT] = NULL; + + if (dist->prefix[DISTRIBUTE_V6_IN]) { + plist = prefix_list_lookup(AFI_IP6, + dist->prefix[DISTRIBUTE_V6_IN]); + if (plist) + ri->prefix[RIPNG_FILTER_IN] = plist; + else + ri->prefix[RIPNG_FILTER_IN] = NULL; + } else + ri->prefix[RIPNG_FILTER_IN] = NULL; + + if (dist->prefix[DISTRIBUTE_V6_OUT]) { + plist = prefix_list_lookup(AFI_IP6, + dist->prefix[DISTRIBUTE_V6_OUT]); + if (plist) + ri->prefix[RIPNG_FILTER_OUT] = plist; + else + ri->prefix[RIPNG_FILTER_OUT] = NULL; + } else + ri->prefix[RIPNG_FILTER_OUT] = NULL; +} + +void ripng_distribute_update_interface(struct interface *ifp) +{ + struct ripng_interface *ri = ifp->info; + struct ripng *ripng = ri->ripng; + struct distribute *dist; + + if (!ripng) + return; + dist = distribute_lookup(ripng->distribute_ctx, ifp->name); + if (dist) + ripng_distribute_update(ripng->distribute_ctx, dist); +} + +/* Update all interface's distribute list. */ +static void ripng_distribute_update_all(struct prefix_list *notused) +{ + struct vrf *vrf = vrf_lookup_by_id(VRF_DEFAULT); + struct interface *ifp; + + FOR_ALL_INTERFACES (vrf, ifp) + ripng_distribute_update_interface(ifp); +} + +static void ripng_distribute_update_all_wrapper(struct access_list *notused) +{ + ripng_distribute_update_all(NULL); +} + +/* delete all the added ripng routes. */ +void ripng_clean(struct ripng *ripng) +{ + ripng_interface_clean(ripng); + + if (ripng->enabled) + ripng_instance_disable(ripng); + + for (int i = 0; i < ZEBRA_ROUTE_MAX; i++) + if (ripng->redist[i].route_map.name) + free(ripng->redist[i].route_map.name); + + agg_table_finish(ripng->table); + list_delete(&ripng->peer_list); + distribute_list_delete(&ripng->distribute_ctx); + if_rmap_ctx_delete(ripng->if_rmap_ctx); + + stream_free(ripng->ibuf); + stream_free(ripng->obuf); + + ripng_clean_network(ripng); + ripng_passive_interface_clean(ripng); + vector_free(ripng->enable_if); + agg_table_finish(ripng->enable_network); + vector_free(ripng->passive_interface); + list_delete(&ripng->offset_list_master); + + RB_REMOVE(ripng_instance_head, &ripng_instances, ripng); + XFREE(MTYPE_RIPNG_VRF_NAME, ripng->vrf_name); + XFREE(MTYPE_RIPNG, ripng); +} + +static void ripng_if_rmap_update(struct if_rmap_ctx *ctx, + struct if_rmap *if_rmap) +{ + struct interface *ifp = NULL; + struct ripng_interface *ri; + struct route_map *rmap; + struct vrf *vrf = NULL; + + if (ctx->name) + vrf = vrf_lookup_by_name(ctx->name); + if (vrf) + ifp = if_lookup_by_name(if_rmap->ifname, vrf->vrf_id); + if (ifp == NULL) + return; + + ri = ifp->info; + + if (if_rmap->routemap[IF_RMAP_IN]) { + rmap = route_map_lookup_by_name(if_rmap->routemap[IF_RMAP_IN]); + if (rmap) + ri->routemap[IF_RMAP_IN] = rmap; + else + ri->routemap[IF_RMAP_IN] = NULL; + } else + ri->routemap[RIPNG_FILTER_IN] = NULL; + + if (if_rmap->routemap[IF_RMAP_OUT]) { + rmap = route_map_lookup_by_name(if_rmap->routemap[IF_RMAP_OUT]); + if (rmap) + ri->routemap[IF_RMAP_OUT] = rmap; + else + ri->routemap[IF_RMAP_OUT] = NULL; + } else + ri->routemap[RIPNG_FILTER_OUT] = NULL; +} + +void ripng_if_rmap_update_interface(struct interface *ifp) +{ + struct ripng_interface *ri = ifp->info; + struct ripng *ripng = ri->ripng; + struct if_rmap *if_rmap; + struct if_rmap_ctx *ctx; + + if (!ripng) + return; + ctx = ripng->if_rmap_ctx; + if (!ctx) + return; + if_rmap = if_rmap_lookup(ctx, ifp->name); + if (if_rmap) + ripng_if_rmap_update(ctx, if_rmap); +} + +static void ripng_routemap_update_redistribute(struct ripng *ripng) +{ + for (int i = 0; i < ZEBRA_ROUTE_MAX; i++) { + if (ripng->redist[i].route_map.name) { + ripng->redist[i].route_map.map = + route_map_lookup_by_name( + ripng->redist[i].route_map.name); + route_map_counter_increment( + ripng->redist[i].route_map.map); + } + } +} + +static void ripng_routemap_update(const char *unused) +{ + struct vrf *vrf = vrf_lookup_by_id(VRF_DEFAULT); + struct ripng *ripng; + struct interface *ifp; + + FOR_ALL_INTERFACES (vrf, ifp) + ripng_if_rmap_update_interface(ifp); + + ripng = vrf->info; + if (ripng) + ripng_routemap_update_redistribute(ripng); +} + +/* Link RIPng instance to VRF. */ +static void ripng_vrf_link(struct ripng *ripng, struct vrf *vrf) +{ + struct interface *ifp; + + ripng->vrf = vrf; + ripng->distribute_ctx->vrf = vrf; + vrf->info = ripng; + + FOR_ALL_INTERFACES (vrf, ifp) + ripng_interface_sync(ifp); +} + +/* Unlink RIPng instance from VRF. */ +static void ripng_vrf_unlink(struct ripng *ripng, struct vrf *vrf) +{ + struct interface *ifp; + + ripng->vrf = NULL; + ripng->distribute_ctx->vrf = NULL; + vrf->info = NULL; + + FOR_ALL_INTERFACES (vrf, ifp) + ripng_interface_sync(ifp); +} + +static void ripng_instance_enable(struct ripng *ripng, struct vrf *vrf, + int sock) +{ + ripng->sock = sock; + + ripng_vrf_link(ripng, vrf); + ripng->enabled = true; + + /* Resend all redistribute requests. */ + ripng_redistribute_enable(ripng); + + /* Create read and timer thread. */ + ripng_event(ripng, RIPNG_READ, ripng->sock); + ripng_event(ripng, RIPNG_UPDATE_EVENT, 1); + + ripng_zebra_vrf_register(vrf); +} + +static void ripng_instance_disable(struct ripng *ripng) +{ + struct vrf *vrf = ripng->vrf; + struct agg_node *rp; + + /* Clear RIPng routes */ + for (rp = agg_route_top(ripng->table); rp; rp = agg_route_next(rp)) { + struct ripng_aggregate *aggregate; + struct list *list; + + if ((list = rp->info) != NULL) { + struct ripng_info *rinfo; + struct listnode *listnode; + + rinfo = listgetdata(listhead(list)); + if (ripng_route_rte(rinfo)) + ripng_zebra_ipv6_delete(ripng, rp); + + for (ALL_LIST_ELEMENTS_RO(list, listnode, rinfo)) { + EVENT_OFF(rinfo->t_timeout); + EVENT_OFF(rinfo->t_garbage_collect); + ripng_info_free(rinfo); + } + list_delete(&list); + rp->info = NULL; + agg_unlock_node(rp); + } + + if ((aggregate = rp->aggregate) != NULL) { + ripng_aggregate_free(aggregate); + rp->aggregate = NULL; + agg_unlock_node(rp); + } + } + + /* Flush all redistribute requests. */ + ripng_redistribute_disable(ripng); + + /* Cancel the RIPng timers */ + EVENT_OFF(ripng->t_update); + EVENT_OFF(ripng->t_triggered_update); + EVENT_OFF(ripng->t_triggered_interval); + + /* Cancel the read thread */ + EVENT_OFF(ripng->t_read); + + /* Close the RIPng socket */ + if (ripng->sock >= 0) { + close(ripng->sock); + ripng->sock = -1; + } + + /* Clear existing peers. */ + list_delete_all_node(ripng->peer_list); + + ripng_zebra_vrf_deregister(vrf); + + ripng_vrf_unlink(ripng, vrf); + ripng->enabled = false; +} + +static int ripng_vrf_new(struct vrf *vrf) +{ + if (IS_RIPNG_DEBUG_EVENT) + zlog_debug("%s: VRF created: %s(%u)", __func__, vrf->name, + vrf->vrf_id); + + return 0; +} + +static int ripng_vrf_delete(struct vrf *vrf) +{ + if (IS_RIPNG_DEBUG_EVENT) + zlog_debug("%s: VRF deleted: %s(%u)", __func__, vrf->name, + vrf->vrf_id); + + return 0; +} + +static int ripng_vrf_enable(struct vrf *vrf) +{ + struct ripng *ripng; + int socket; + + ripng = ripng_lookup_by_vrf_name(vrf->name); + if (!ripng || ripng->enabled) + return 0; + + if (IS_RIPNG_DEBUG_EVENT) + zlog_debug("%s: VRF %s(%u) enabled", __func__, vrf->name, + vrf->vrf_id); + + /* Activate the VRF RIPng instance. */ + socket = ripng_make_socket(vrf); + if (socket < 0) + return -1; + + ripng_instance_enable(ripng, vrf, socket); + + return 0; +} + +static int ripng_vrf_disable(struct vrf *vrf) +{ + struct ripng *ripng; + + ripng = ripng_lookup_by_vrf_name(vrf->name); + if (!ripng || !ripng->enabled) + return 0; + + if (IS_RIPNG_DEBUG_EVENT) + zlog_debug("%s: VRF %s(%u) disabled", __func__, vrf->name, + vrf->vrf_id); + + /* Deactivate the VRF RIPng instance. */ + if (ripng->enabled) + ripng_instance_disable(ripng); + + return 0; +} + +void ripng_vrf_init(void) +{ + vrf_init(ripng_vrf_new, ripng_vrf_enable, ripng_vrf_disable, + ripng_vrf_delete); + + vrf_cmd_init(NULL); +} + +void ripng_vrf_terminate(void) +{ + vrf_terminate(); +} + +/* Initialize ripng structure and set commands. */ +void ripng_init(void) +{ + /* Install RIPNG_NODE. */ + install_node(&cmd_ripng_node); + + /* Install ripng commands. */ + install_element(VIEW_NODE, &show_ipv6_ripng_cmd); + install_element(VIEW_NODE, &show_ipv6_ripng_status_cmd); + + install_default(RIPNG_NODE); + + ripng_if_init(); + ripng_debug_init(); + + /* Access list install. */ + access_list_init(); + access_list_add_hook(ripng_distribute_update_all_wrapper); + access_list_delete_hook(ripng_distribute_update_all_wrapper); + + /* Prefix list initialize.*/ + prefix_list_init(); + prefix_list_add_hook(ripng_distribute_update_all); + prefix_list_delete_hook(ripng_distribute_update_all); + + /* Route-map for interface. */ + ripng_route_map_init(); + + route_map_add_hook(ripng_routemap_update); + route_map_delete_hook(ripng_routemap_update); + + if_rmap_init(RIPNG_NODE); +} |