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ripngd.c
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/* RIPng daemon
* Copyright (C) 1998, 1999 Kunihiro Ishiguro
*
* This file is part of GNU Zebra.
*
* GNU Zebra is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2, or (at your option) any
* later version.
*
* GNU Zebra is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNU Zebra; see the file COPYING. If not, write to the Free
* Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
* 02111-1307, USA.
*/
#include <zebra.h>
#include "prefix.h"
#include "filter.h"
#include "log.h"
#include "thread.h"
#include "memory.h"
#include "if.h"
#include "stream.h"
#include "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 "ripngd/ripngd.h"
#include "ripngd/ripng_route.h"
#include "ripngd/ripng_debug.h"
#include "ripngd/ripng_nexthop.h"
/* RIPng structure which includes many parameters related to RIPng
protocol. If ripng couldn't active or ripng doesn't configured,
ripng->fd must be negative value. */
struct ripng *ripng = NULL;
enum
{
ripng_all_route,
ripng_changed_route,
};
extern struct zebra_privs_t ripngd_privs;
/* Prototypes. */
void
ripng_output_process (struct interface *, struct sockaddr_in6 *, int);
int
ripng_triggered_update (struct thread *);
/* 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 ()
{
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);
}
/* Create ripng socket. */
int
ripng_make_socket (void)
{
int ret;
int sock;
struct sockaddr_in6 ripaddr;
sock = socket (AF_INET6, SOCK_DGRAM, 0);
if (sock < 0)
{
zlog (NULL, LOG_ERR, "Can't make ripng socket");
return sock;
}
ret = setsockopt_so_recvbuf (sock, 8096);
if (ret < 0)
return ret;
ret = setsockopt_ipv6_pktinfo (sock, 1);
if (ret < 0)
return ret;
ret = setsockopt_ipv6_multicast_hops (sock, 255);
if (ret < 0)
return ret;
ret = setsockopt_ipv6_multicast_loop (sock, 0);
if (ret < 0)
return ret;
ret = setsockopt_ipv6_hoplimit (sock, 1);
if (ret < 0)
return ret;
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);
if (ripngd_privs.change (ZPRIVS_RAISE))
zlog_err ("ripng_make_socket: could not raise privs");
ret = bind (sock, (struct sockaddr *) &ripaddr, sizeof (ripaddr));
if (ret < 0)
{
zlog (NULL, LOG_ERR, "Can't bind ripng socket: %s.", safe_strerror (errno));
if (ripngd_privs.change (ZPRIVS_LOWER))
zlog_err ("ripng_make_socket: could not lower privs");
return ret;
}
if (ripngd_privs.change (ZPRIVS_LOWER))
zlog_err ("ripng_make_socket: could not lower privs");
return sock;
}
/* Send RIPng packet. */
int
ripng_send_packet (caddr_t buf, int bufsize, struct sockaddr_in6 *to,
struct interface *ifp)
{
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 %s", inet6_ntoa (to->sin6_addr));
zlog_debug (" send interface %s", ifp->name);
zlog_debug (" send packet size %d", bufsize);
}
memset (&addr, 0, sizeof (struct sockaddr_in6));
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);
}
msg.msg_name = (void *) &addr;
msg.msg_namelen = sizeof (struct sockaddr_in6);
msg.msg_iov = &iov;
msg.msg_iovlen = 1;
msg.msg_control = (void *) 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)
zlog_err ("RIPng send fail on %s to %s: %s", ifp->name,
inet6_ntoa (to->sin6_addr), safe_strerror (errno));
else
zlog_err ("RIPng send fail on %s: %s", ifp->name, safe_strerror (errno));
}
return ret;
}
/* Receive UDP RIPng packet from socket. */
int
ripng_recv_packet (int sock, u_char *buf, int bufsize,
struct sockaddr_in6 *from, unsigned int *ifindex,
int *hoplimit)
{
int ret;
struct msghdr msg;
struct iovec iov;
struct cmsghdr *cmsgptr;
struct in6_addr 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. */
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 = ZCMSG_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)
*hoplimit = *((int *) CMSG_DATA (cmsgptr));
}
/* 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 %s/%d", inet6_ntoa (rte->addr), rte->prefixlen);
else
zlog_debug (" %s/%d metric %d tag %d",
inet6_ntoa (rte->addr), rte->prefixlen,
rte->metric, ntohs (rte->tag));
}
}
/* RIPng next hop address RTE (Route Table Entry). */
void
ripng_nexthop_rte (struct rte *rte,
struct sockaddr_in6 *from,
struct ripng_nexthop *nexthop)
{
char buf[INET6_BUFSIZ];
/* Logging before checking RTE. */
if (IS_RIPNG_DEBUG_RECV)
zlog_debug ("RIPng nexthop RTE address %s tag %d prefixlen %d",
inet6_ntoa (rte->addr), 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 %d from %s",
ntohs (rte->tag), inet6_ntoa (from->sin6_addr));
if (rte->prefixlen != 0)
zlog_warn ("RIPng nexthop RTE with non zero prefixlen value %d from %s",
rte->prefixlen, inet6_ntoa (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 %s from %s",
inet6_ntoa (rte->addr),
inet_ntop (AF_INET6, &from->sin6_addr, buf, INET6_BUFSIZ));
nexthop->flag = RIPNG_NEXTHOP_UNSPEC;
memset (&nexthop->address, 0, sizeof (struct in6_addr));
return;
}
/* If ifp has same link-local address then return 1. */
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. */
int
ripng_garbage_collect (struct thread *t)
{
struct ripng_info *rinfo;
struct route_node *rp;
rinfo = THREAD_ARG (t);
rinfo->t_garbage_collect = NULL;
/* Off timeout timer. */
RIPNG_TIMER_OFF (rinfo->t_timeout);
/* Get route_node pointer. */
rp = rinfo->rp;
/* Unlock route_node. */
rp->info = NULL;
route_unlock_node (rp);
/* Free RIPng routing information. */
ripng_info_free (rinfo);
return 0;
}
/* Timeout RIPng routes. */
int
ripng_timeout (struct thread *t)
{
struct ripng_info *rinfo;
struct route_node *rp;
rinfo = THREAD_ARG (t);
rinfo->t_timeout = NULL;
/* Get route_node pointer. */
rp = rinfo->rp;
/* - The garbage-collection timer is set for 120 seconds. */
RIPNG_TIMER_ON (rinfo->t_garbage_collect, ripng_garbage_collect,
ripng->garbage_time);
/* Delete this route from the kernel. */
ripng_zebra_ipv6_delete ((struct prefix_ipv6 *)&rp->p, &rinfo->nexthop,
rinfo->ifindex);
/* - The metric for the route is set to 16 (infinity). This causes
the route to be removed from service. */
rinfo->metric = RIPNG_METRIC_INFINITY;
rinfo->flags &= ~RIPNG_RTF_FIB;
/* Aggregate count decrement. */
ripng_aggregate_decrement (rp, rinfo);
/* - The route change flag is to indicate that this entry has been
changed. */
rinfo->flags |= RIPNG_RTF_CHANGED;
/* - The output process is signalled to trigger a response. */
ripng_event (RIPNG_TRIGGERED_UPDATE, 0);
return 0;
}
void
ripng_timeout_update (struct ripng_info *rinfo)
{
if (rinfo->metric != RIPNG_METRIC_INFINITY)
{
RIPNG_TIMER_OFF (rinfo->t_timeout);
RIPNG_TIMER_ON (rinfo->t_timeout, ripng_timeout, ripng->timeout_time);
}
}
int
ripng_incoming_filter (struct prefix_ipv6 *p, struct ripng_interface *ri)
{
struct distribute *dist;
struct access_list *alist;
struct prefix_list *plist;
/* Input distribute-list filtering. */
if (ri->list[RIPNG_FILTER_IN])
{
if (access_list_apply (ri->list[RIPNG_FILTER_IN],
(struct prefix *) p) == FILTER_DENY)
{
if (IS_RIPNG_DEBUG_PACKET)
zlog_debug ("%s/%d filtered by distribute in",
inet6_ntoa (p->prefix), p->prefixlen);
return -1;
}
}
if (ri->prefix[RIPNG_FILTER_IN])
{
if (prefix_list_apply (ri->prefix[RIPNG_FILTER_IN],
(struct prefix *) p) == PREFIX_DENY)
{
if (IS_RIPNG_DEBUG_PACKET)
zlog_debug ("%s/%d filtered by prefix-list in",
inet6_ntoa (p->prefix), p->prefixlen);
return -1;
}
}
/* All interface filter check. */
dist = distribute_lookup (NULL);
if (dist)
{
if (dist->list[DISTRIBUTE_IN])
{
alist = access_list_lookup (AFI_IP6, dist->list[DISTRIBUTE_IN]);
if (alist)
{
if (access_list_apply (alist,
(struct prefix *) p) == FILTER_DENY)
{
if (IS_RIPNG_DEBUG_PACKET)
zlog_debug ("%s/%d filtered by distribute in",
inet6_ntoa (p->prefix), p->prefixlen);
return -1;
}
}
}
if (dist->prefix[DISTRIBUTE_IN])
{
plist = prefix_list_lookup (AFI_IP6, dist->prefix[DISTRIBUTE_IN]);
if (plist)
{
if (prefix_list_apply (plist,
(struct prefix *) p) == PREFIX_DENY)
{
if (IS_RIPNG_DEBUG_PACKET)
zlog_debug ("%s/%d filtered by prefix-list in",
inet6_ntoa (p->prefix), p->prefixlen);
return -1;
}
}
}
}
return 0;
}
int
ripng_outgoing_filter (struct prefix_ipv6 *p, struct ripng_interface *ri)
{
struct distribute *dist;
struct access_list *alist;
struct prefix_list *plist;
if (ri->list[RIPNG_FILTER_OUT])
{
if (access_list_apply (ri->list[RIPNG_FILTER_OUT],
(struct prefix *) p) == FILTER_DENY)
{
if (IS_RIPNG_DEBUG_PACKET)
zlog_debug ("%s/%d is filtered by distribute out",
inet6_ntoa (p->prefix), p->prefixlen);
return -1;
}
}
if (ri->prefix[RIPNG_FILTER_OUT])
{
if (prefix_list_apply (ri->prefix[RIPNG_FILTER_OUT],
(struct prefix *) p) == PREFIX_DENY)
{
if (IS_RIPNG_DEBUG_PACKET)
zlog_debug ("%s/%d is filtered by prefix-list out",
inet6_ntoa (p->prefix), p->prefixlen);
return -1;
}
}
/* All interface filter check. */
dist = distribute_lookup (NULL);
if (dist)
{
if (dist->list[DISTRIBUTE_OUT])
{
alist = access_list_lookup (AFI_IP6, dist->list[DISTRIBUTE_OUT]);
if (alist)
{
if (access_list_apply (alist,
(struct prefix *) p) == FILTER_DENY)
{
if (IS_RIPNG_DEBUG_PACKET)
zlog_debug ("%s/%d filtered by distribute out",
inet6_ntoa (p->prefix), p->prefixlen);
return -1;
}
}
}
if (dist->prefix[DISTRIBUTE_OUT])
{
plist = prefix_list_lookup (AFI_IP6, dist->prefix[DISTRIBUTE_OUT]);
if (plist)
{
if (prefix_list_apply (plist,
(struct prefix *) p) == PREFIX_DENY)
{
if (IS_RIPNG_DEBUG_PACKET)
zlog_debug ("%s/%d filtered by prefix-list out",
inet6_ntoa (p->prefix), p->prefixlen);
return -1;
}
}
}
}
return 0;
}
/* Process RIPng route according to RFC2080. */
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 route_node *rp;
struct ripng_info *rinfo;
struct ripng_interface *ri;
struct in6_addr *nexthop;
u_char oldmetric;
int same = 0;
/* 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);
/* Apply input filters. */
ri = ifp->info;
ret = ripng_incoming_filter (&p, ri);
if (ret < 0)
return;
/* Modify entry. */
if (ri->routemap[RIPNG_FILTER_IN])
{
int ret;
struct ripng_info newinfo;
memset (&newinfo, 0, sizeof (struct ripng_info));
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 */
ret = route_map_apply (ri->routemap[RIPNG_FILTER_IN],
(struct prefix *)&p, RMAP_RIPNG, &newinfo);
if (ret == RMAP_DENYMATCH)
{
if (IS_RIPNG_DEBUG_PACKET)
zlog_debug ("RIPng %s/%d is filtered by route-map in",
inet6_ntoa (p.prefix), p.prefixlen);
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 (&p, ifp, &rte->metric);
/* If offset-list does not modify the metric use interface's
* one. */
if (! ret)
rte->metric += ifp->metric;
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 = route_node_get (ripng->table, (struct prefix *) &p);
/* Sanity check */
rinfo = rp->info;
if (rinfo)
{
/* Redistributed route check. */
if (rinfo->type != ZEBRA_ROUTE_RIPNG
&& rinfo->metric != RIPNG_METRIC_INFINITY)
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)
return;
}
if (rp->info == NULL)
{
/* 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)
{
rinfo = ripng_info_new ();
/* - Setting the destination prefix and length to those in
the RTE. */
rp->info = rinfo;
rinfo->rp = rp;
/* - Setting the metric to the newly calculated metric (as
described above). */
rinfo->metric = rte->metric;
rinfo->tag = ntohs (rte->tag);
/* - Set the next hop address to be the address of the router
from which the datagram came or the next hop address
specified by a next hop RTE. */
IPV6_ADDR_COPY (&rinfo->nexthop, nexthop);
IPV6_ADDR_COPY (&rinfo->from, &from->sin6_addr);
rinfo->ifindex = ifp->ifindex;
/* - Initialize the timeout for the route. If the
garbage-collection timer is running for this route, stop it. */
ripng_timeout_update (rinfo);
/* - Set the route change flag. */
rinfo->flags |= RIPNG_RTF_CHANGED;
/* - Signal the output process to trigger an update (see section
2.5). */
ripng_event (RIPNG_TRIGGERED_UPDATE, 0);
/* Finally, route goes into the kernel. */
rinfo->type = ZEBRA_ROUTE_RIPNG;
rinfo->sub_type = RIPNG_ROUTE_RTE;
ripng_zebra_ipv6_add (&p, &rinfo->nexthop, rinfo->ifindex,
rinfo->metric);
rinfo->flags |= RIPNG_RTF_FIB;
/* Aggregate check. */
ripng_aggregate_increment (rp, rinfo);
}
}
else
{
rinfo = rp->info;
/* 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));
if (same)
ripng_timeout_update (rinfo);
/* 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: */
if ((same && rinfo->metric != rte->metric) ||
rte->metric < rinfo->metric)
{
/* - Adopt the route from the datagram. That is, put the
new metric in, and adjust the next hop address (if
necessary). */
oldmetric = rinfo->metric;
rinfo->metric = rte->metric;
rinfo->tag = ntohs (rte->tag);
IPV6_ADDR_COPY (&rinfo->from, &from->sin6_addr);
rinfo->ifindex = ifp->ifindex;
/* Should a new route to this network be established
while the garbage-collection timer is running, the
new route will replace the one that is about to be
deleted. In this case the garbage-collection timer
must be cleared. */
if (oldmetric == RIPNG_METRIC_INFINITY &&
rinfo->metric < RIPNG_METRIC_INFINITY)
{
rinfo->type = ZEBRA_ROUTE_RIPNG;
rinfo->sub_type = RIPNG_ROUTE_RTE;
RIPNG_TIMER_OFF (rinfo->t_garbage_collect);
if (! IPV6_ADDR_SAME (&rinfo->nexthop, nexthop))
IPV6_ADDR_COPY (&rinfo->nexthop, nexthop);
ripng_zebra_ipv6_add (&p, nexthop, ifp->ifindex, rinfo->metric);
rinfo->flags |= RIPNG_RTF_FIB;
/* The aggregation counter needs to be updated because
the prefixes, which are into the gc, have been
removed from the aggregator (see ripng_timout). */
ripng_aggregate_increment (rp, rinfo);
}
/* Update nexthop and/or metric value. */
if (oldmetric != RIPNG_METRIC_INFINITY)
{
ripng_zebra_ipv6_delete (&p, &rinfo->nexthop, rinfo->ifindex);
ripng_zebra_ipv6_add (&p, nexthop, ifp->ifindex, rinfo->metric);
rinfo->flags |= RIPNG_RTF_FIB;
if (! IPV6_ADDR_SAME (&rinfo->nexthop, nexthop))
IPV6_ADDR_COPY (&rinfo->nexthop, nexthop);
}
/* - Set the route change flag and signal the output process
to trigger an update. */
rinfo->flags |= RIPNG_RTF_CHANGED;
ripng_event (RIPNG_TRIGGERED_UPDATE, 0);
/* - If the new metric is infinity, start the deletion
process (described above); */
if (rinfo->metric == RIPNG_METRIC_INFINITY)
{
/* If the new metric is infinity, the deletion process
begins for the route, which is no longer used for
routing packets. Note that the deletion process is
started only when the metric is first set to
infinity. If the metric was already infinity, then a
new deletion process is not started. */
if (oldmetric != RIPNG_METRIC_INFINITY)
{
/* - The garbage-collection timer is set for 120 seconds. */
RIPNG_TIMER_ON (rinfo->t_garbage_collect,
ripng_garbage_collect, ripng->garbage_time);
RIPNG_TIMER_OFF (rinfo->t_timeout);
/* - The metric for the route is set to 16
(infinity). This causes the route to be removed
from service.*/
ripng_zebra_ipv6_delete (&p, &rinfo->nexthop, rinfo->ifindex);
rinfo->flags &= ~RIPNG_RTF_FIB;
/* Aggregate count decrement. */
ripng_aggregate_decrement (rp, rinfo);
/* - The route change flag is to indicate that this
entry has been changed. */
/* - The output process is signalled to trigger a
response. */
; /* Above processes are already done previously. */
}
}
else
{
/* otherwise, re-initialize the timeout. */
ripng_timeout_update (rinfo);
}
}
/* Unlock tempolary lock of the route. */
route_unlock_node (rp);
}
}
/* Add redistributed route to RIPng table. */
void
ripng_redistribute_add (int type, int sub_type, struct prefix_ipv6 *p,
unsigned int ifindex, struct in6_addr *nexthop)
{
struct route_node *rp;
struct ripng_info *rinfo;
/* Redistribute route */
if (IN6_IS_ADDR_LINKLOCAL (&p->prefix))
return;
if (IN6_IS_ADDR_LOOPBACK (&p->prefix))
return;
#if defined (MUSICA) || defined (LINUX)
/* XXX As long as the RIPng redistribution is applied to all the connected
* routes, one needs to filter the ::/96 prefixes.
* However it could be a wanted case, it will be removed soon.
*/
if ((IN6_IS_ADDR_V4COMPAT(&p->prefix)) ||
(IN6_IS_ADDR_UNSPECIFIED (&p->prefix) && (p->prefixlen == 96)))
return;
#endif /* MUSICA or LINUX */
rp = route_node_get (ripng->table, (struct prefix *) p);
rinfo = rp->info;
if (rinfo)
{
if (rinfo->type == ZEBRA_ROUTE_CONNECT
&& rinfo->sub_type == RIPNG_ROUTE_INTERFACE
&& rinfo->metric != RIPNG_METRIC_INFINITY) {
route_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))) {
route_unlock_node (rp);
return;
}
}
RIPNG_TIMER_OFF (rinfo->t_timeout);
RIPNG_TIMER_OFF (rinfo->t_garbage_collect);
/* Tells the other daemons about the deletion of
* this RIPng route
**/
if (ripng_route_rte (rinfo))
ripng_zebra_ipv6_delete ((struct prefix_ipv6 *)&rp->p, &rinfo->nexthop,
rinfo->metric);
rp->info = NULL;
ripng_info_free (rinfo);
route_unlock_node (rp);
}
rinfo = ripng_info_new ();
rinfo->type = type;
rinfo->sub_type = sub_type;
rinfo->ifindex = ifindex;
rinfo->metric = 1;
rinfo->rp = rp;
if (nexthop && IN6_IS_ADDR_LINKLOCAL(nexthop))
rinfo->nexthop = *nexthop;
rinfo->flags |= RIPNG_RTF_FIB;
rp->info = rinfo;
/* Aggregate check. */
ripng_aggregate_increment (rp, rinfo);
rinfo->flags |= RIPNG_RTF_CHANGED;
if (IS_RIPNG_DEBUG_EVENT) {
if (!nexthop)
zlog_debug ("Redistribute new prefix %s/%d on the interface %s",
inet6_ntoa(p->prefix), p->prefixlen,
ifindex2ifname(ifindex));
else
zlog_debug ("Redistribute new prefix %s/%d with nexthop %s on the interface %s",