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ripngd.c
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// 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 "mgmt_be_client.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 connected *connected;
struct prefix *p;
frr_each (if_connected, ifp->connected, 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