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NetBSD/usr.sbin/ldpd/mpls_routes.c

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/* $NetBSD: mpls_routes.c,v 1.25 2022/04/07 19:33:38 andvar Exp $ */
/*-
* Copyright (c) 2010 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Mihai Chelaru <kefren@NetBSD.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/param.h>
#include <sys/sysctl.h>
#include <net/if.h>
#include <net/route.h>
#include <netinet/in.h>
#include <netmpls/mpls.h>
#include <arpa/inet.h>
#include <assert.h>
#include <stdlib.h>
#include <errno.h>
#include <poll.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include "ldp.h"
#include "ldp_errors.h"
#include "ldp_peer.h"
#include "mpls_interface.h"
#include "tlv_stack.h"
#include "label.h"
#include "mpls_routes.h"
#include "socketops.h"
extern int route_socket;
int rt_seq = 200;
int dont_catch = 0;
extern int no_default_route;
extern int debug_f, warn_f;
static int my_pid = 0;
struct rt_msg replay_rt[REPLAY_MAX];
int replay_index = 0;
#if 0
static int read_route_socket(char *, int);
#endif
void mask_addr(union sockunion *);
int compare_sockunion(const union sockunion *, const union sockunion *);
static int check_if_addr_updown(struct rt_msg *, uint);
extern struct sockaddr mplssockaddr;
/* Many lines inspired or shamelessly stolen from sbin/route/route.c */
#define NEXTADDR(u) \
do { l = RT_ROUNDUP(u->sa.sa_len); memcpy(cp, u, l); cp += l;} while(0);
#define NEXTADDR2(u) \
do { l = RT_ROUNDUP(u.sa_len); memcpy(cp, &u, l); cp += l; } while(0);
#define CHECK_LEN(sunion) \
if (size_cp + sunion->sa.sa_len > rlen) \
return LDP_E_ROUTE_ERROR; \
else \
size_cp += sunion->sa.sa_len;
#define CHECK_MINSA \
if (size_cp + sizeof(sa_family_t) + sizeof(uint8_t) > rlen) \
return LDP_E_ROUTE_ERROR;
#define GETNEXT(dstunion, origunion) \
do { \
CHECK_MINSA \
dstunion = (union sockunion *) ((char *) (origunion) + \
RT_ROUNDUP((origunion)->sa.sa_len)); \
CHECK_LEN(dstunion) \
} while (0);
#if 0
static int
read_route_socket(char *s, int max)
{
int rv, to_read;
struct rt_msghdr *rhdr;
struct pollfd pfd;
pfd.fd = route_socket;
pfd.events = POLLRDNORM;
pfd.revents = 0;
errno = 0;
do {
rv = poll(&pfd, 1, 100);
} while (rv == -1 && errno == EINTR);
if (rv < 1) {
if (rv == 0) {
fatalp("read_route_socket: poll timeout\n");
} else
fatalp("read_route_socket: poll: %s",
strerror(errno));
return 0;
}
do {
rv = recv(route_socket, s, max, MSG_PEEK);
} while(rv == -1 && errno == EINTR);
if (rv < 1) {
debugp("read_route_socket: recv error\n");
return 0;
}
if (rv > max) {
rv = max;
debugp("read_route_socket: rv > max\n");
}
rhdr = (struct rt_msghdr *)s;
to_read = rhdr->rtm_msglen > max ? max : rhdr->rtm_msglen;
rv = 0;
do {
rv += recv(route_socket, s, to_read - rv, 0);
} while (rv != to_read);
return rv;
}
#endif /* 0 */
/* Recalculate length */
void
mask_addr(union sockunion * su)
{
/*
int olen = su->sa.sa_len;
char *cp1 = olen + (char *) su;
for (su->sa.sa_len = 0; cp1 > (char *) su;)
if (*--cp1 != 0) {
su->sa.sa_len = 1 + cp1 - (char *) su;
break;
}
*/
/* Let's use INET only version for the moment */
su->sa.sa_len = 4 + from_union_to_cidr(su) / 8 +
( from_union_to_cidr(su) % 8 ? 1 : 0 );
}
/* creates a sockunion from an IP address */
union sockunion *
make_inet_union(const char *s)
{
union sockunion *so_inet;
so_inet = calloc(1, sizeof(*so_inet));
if (!so_inet) {
fatalp("make_inet_union: malloc problem\n");
return NULL;
}
so_inet->sin.sin_len = sizeof(struct sockaddr_in);
so_inet->sin.sin_family = AF_INET;
inet_aton(s, &so_inet->sin.sin_addr);
return so_inet;
}
/* creates a sockunion from a label */
union sockunion *
make_mpls_union(uint32_t label)
{
union sockunion *so_mpls;
so_mpls = calloc(1, sizeof(*so_mpls));
if (!so_mpls) {
fatalp("make_mpls_union: malloc problem\n");
return NULL;
}
so_mpls->smpls.smpls_len = sizeof(struct sockaddr_mpls);
so_mpls->smpls.smpls_family = AF_MPLS;
so_mpls->smpls.smpls_addr.shim.label = label;
so_mpls->smpls.smpls_addr.s_addr =
htonl(so_mpls->smpls.smpls_addr.s_addr);
return so_mpls;
}
int
compare_sockunion(const union sockunion * __restrict a,
const union sockunion * __restrict b)
{
if (a->sa.sa_len != b->sa.sa_len)
return 1;
return memcmp(a, b, a->sa.sa_len);
}
union sockunion *
from_cidr_to_union(uint8_t prefixlen)
{
union sockunion *u;
uint32_t m = 0xFFFFFFFF;
u = calloc(1, sizeof(*u));
if (!u) {
fatalp("from_cidr_to_union: malloc problem\n");
return NULL;
}
u->sin.sin_len = sizeof(struct sockaddr_in);
u->sin.sin_family = AF_INET;
if (prefixlen != 0) {
m = (m >> (32 - prefixlen) ) << (32 - prefixlen);
m = ntohl(m);
u->sin.sin_addr.s_addr = m;
}
return u;
}
uint8_t
from_mask_to_cidr(const char *mask)
{
struct in_addr addr;
uint8_t plen = 0;
if (inet_aton(mask, &addr) != 0)
for (; addr.s_addr; plen++)
addr.s_addr &= addr.s_addr - 1;
return plen;
}
uint8_t
from_union_to_cidr(const union sockunion *so_pref)
{
const struct sockaddr_in *sin = (const struct sockaddr_in*) so_pref;
uint32_t a;
uint8_t r;
a = ntohl(sin->sin_addr.s_addr);
for (r=0; a ; a = a << 1, r++);
return r;
}
/* returns in mask the netmask created from CIDR prefixlen */
void
from_cidr_to_mask(uint8_t prefixlen, char *mask)
{
uint32_t a = 0;
uint8_t plen = prefixlen < 32 ? prefixlen : 32;
if (plen != 0)
a = (0xffffffff >> (32 - plen)) << (32 - plen);
snprintf(mask, 16, "%d.%d.%d.%d", a >> 24, (a << 8) >> 24,
(a << 16) >> 24, (a << 24) >> 24);
}
/* From src/sbin/route/route.c */
static const char *
route_strerror(int error)
{
switch (error) {
case ESRCH:
return "not in table";
case EBUSY:
return "entry in use";
case ENOBUFS:
return "routing table overflow";
default:
return strerror(error);
}
}
/* Adds a route. Or changes it. */
int
add_route(union sockunion *so_dest, union sockunion *so_prefix,
union sockunion *so_gate, union sockunion *so_ifa,
union sockunion *so_tag, int fr, int optype)
{
int l, rlen, rv = LDP_E_OK;
struct rt_msg rm;
char *cp;
if(dont_catch)
return LDP_E_OK;
memset(&rm, 0, sizeof(rm));
cp = rm.m_space;
rm.m_rtm.rtm_type = (optype == RTM_READD) ? RTM_ADD : optype;
rm.m_rtm.rtm_flags = RTF_UP | RTF_GATEWAY | RTF_STATIC;
rm.m_rtm.rtm_version = RTM_VERSION;
rm.m_rtm.rtm_seq = ++rt_seq;
rm.m_rtm.rtm_addrs = RTA_DST;
if (so_gate)
rm.m_rtm.rtm_addrs |= RTA_GATEWAY;
assert(so_dest);
/* Order is: destination, gateway, netmask, genmask, ifp, ifa, tag */
NEXTADDR(so_dest);
if (so_gate)
NEXTADDR(so_gate);
if (so_prefix) {
union sockunion *so_prefix_temp = so_prefix;
if (fr != FREESO) {
/* don't modify so_prefix */
so_prefix_temp = calloc(1, so_prefix->sa.sa_len);
if (so_prefix_temp == NULL)
return LDP_E_MEMORY;
memcpy(so_prefix_temp, so_prefix, so_prefix->sa.sa_len);
}
mask_addr(so_prefix_temp);
NEXTADDR(so_prefix_temp);
if (fr != FREESO)
free(so_prefix_temp);
/* XXX: looks like nobody cares about this */
rm.m_rtm.rtm_flags |= RTF_MASK;
rm.m_rtm.rtm_addrs |= RTA_NETMASK;
} else
rm.m_rtm.rtm_flags |= RTF_HOST;
/* route to mpls interface */
if (optype != RTM_READD && so_dest->sa.sa_family != AF_MPLS) {
NEXTADDR2(mplssockaddr);
rm.m_rtm.rtm_addrs |= RTA_IFP;
}
if (so_ifa != NULL) {
NEXTADDR(so_ifa);
rm.m_rtm.rtm_addrs |= RTA_IFA;
}
if (so_tag) {
NEXTADDR(so_tag);
rm.m_rtm.rtm_addrs |= RTA_TAG;
}
rm.m_rtm.rtm_msglen = l = cp - (char *) &rm;
if ((rlen = write(route_socket, (char *) &rm, l)) < l) {
warnp("Error adding a route: %s\n", route_strerror(errno));
warnp("Destination was: %s\n", satos(&so_dest->sa));
if (so_prefix)
warnp("Prefix was: %s\n", satos(&so_prefix->sa));
if (so_gate)
warnp("Gateway was: %s\n", satos(&so_gate->sa));
rv = LDP_E_ROUTE_ERROR;
}
if (fr == FREESO) {
free(so_dest);
if (so_prefix)
free(so_prefix);
if (so_gate)
free(so_gate);
if (so_ifa)
free(so_ifa);
if (so_tag)
free(so_tag);
}
return rv;
}
/* Deletes a route */
int
delete_route(union sockunion * so_dest, union sockunion * so_pref, int freeso)
{
int l, rlen;
struct rt_msg rm;
char *cp;
if(dont_catch)
return LDP_E_OK;
memset(&rm, 0, sizeof(struct rt_msg));
cp = rm.m_space;
rm.m_rtm.rtm_type = RTM_DELETE;
rm.m_rtm.rtm_version = RTM_VERSION;
rm.m_rtm.rtm_seq = ++rt_seq;
if (so_pref)
rm.m_rtm.rtm_addrs = RTA_DST | RTA_NETMASK;
else {
rm.m_rtm.rtm_addrs = RTA_DST;
rm.m_rtm.rtm_flags |= RTF_HOST;
}
/* destination, gateway, netmask, genmask, ifp, ifa */
NEXTADDR(so_dest);
if (so_pref) {
union sockunion *so_pref_temp = so_pref;
if (freeso != FREESO) {
/* don't modify the original prefix */
so_pref_temp = calloc(1, so_pref->sa.sa_len);
if (so_pref_temp == NULL)
return LDP_E_MEMORY;
memcpy(so_pref_temp, so_pref, so_pref->sa.sa_len);
}
mask_addr(so_pref_temp);
NEXTADDR(so_pref_temp);
if (freeso != FREESO)
free(so_pref_temp);
}
rm.m_rtm.rtm_msglen = l = cp - (char *) &rm;
if (freeso == FREESO) {
free(so_dest);
if (so_pref)
free(so_pref);
}
if ((rlen = write(route_socket, (char *) &rm, l)) < l) {
if(so_pref) {
char spreftmp[INET_ADDRSTRLEN];
strlcpy(spreftmp, inet_ntoa(so_pref->sin.sin_addr),
INET_ADDRSTRLEN);
warnp("Error deleting route(%s): %s/%s",
route_strerror(errno), satos(&so_dest->sa),
spreftmp);
} else
warnp("Error deleting route(%s) : %s",
route_strerror(errno), satos(&so_dest->sa));
return LDP_E_NO_SUCH_ROUTE;
}
return LDP_E_OK;
}
#if 0
/*
* Check for a route and returns it in rg
* If exact_match is set it compares also the so_dest and so_pref
* with the returned result
*/
int
get_route(struct rt_msg * rg, const union sockunion * so_dest,
const union sockunion * so_pref, int exact_match)
{
int l, rlen, myseq;
struct rt_msg rm;
char *cp;
union sockunion *su;
memset(&rm, 0, sizeof(struct rt_msg));
cp = rm.m_space;
myseq = ++rt_seq;
rm.m_rtm.rtm_type = RTM_GET;
rm.m_rtm.rtm_version = RTM_VERSION;
rm.m_rtm.rtm_seq = myseq;
/*
* rtm_addrs should contain what we provide into this message but
* RTA_DST | RTA_IFP trick is allowed in order to find out the
* interface.
*/
rm.m_rtm.rtm_addrs = RTA_DST | RTA_IFP;
/*
* ORDER of fields is: destination, gateway, netmask, genmask, ifp,
* ifa
*/
NEXTADDR(so_dest);
if (so_pref) {
union sockunion *so_pref_temp = calloc(1, so_pref->sa.sa_len);
if (so_pref_temp == NULL)
return LDP_E_MEMORY;
rm.m_rtm.rtm_addrs |= RTA_NETMASK;
memcpy(so_pref_temp, so_pref, so_pref->sa.sa_len);
mask_addr(so_pref_temp);
NEXTADDR(so_pref_temp);
free(so_pref_temp);
}
rm.m_rtm.rtm_msglen = l = cp - (char *) &rm;
setsockopt(route_socket, SOL_SOCKET, SO_USELOOPBACK, &(int){1},
sizeof(int));
rlen = write(route_socket, (char *) &rm, l);
setsockopt(route_socket, SOL_SOCKET, SO_USELOOPBACK, &(int){0},
sizeof(int));
if (rlen < l) {
debugp("Cannot get a route !(rlen=%d instead of %d) - %s\n",
rlen, l, strerror(errno));
return LDP_E_NO_SUCH_ROUTE;
} else
for ( ; ; ) {
rlen = read_route_socket((char *) rg,
sizeof(struct rt_msg));
if (rlen < 1)
break;
/*
* We might lose important messages here. WORKAROUND:
* For now I just try to save this messages and replay
* them later
*/
if (rg->m_rtm.rtm_pid == getpid() &&
rg->m_rtm.rtm_seq == myseq)
break;
/* Fast skip */
if (rg->m_rtm.rtm_type != RTM_ADD &&
rg->m_rtm.rtm_type != RTM_DELETE &&
rg->m_rtm.rtm_type != RTM_CHANGE &&
rg->m_rtm.rtm_type != RTM_NEWADDR &&
rg->m_rtm.rtm_type != RTM_DELADDR)
continue;
warnp("Added to replay PID: %d, SEQ: %d\n",
rg->m_rtm.rtm_pid, rg->m_rtm.rtm_seq);
memcpy(&replay_rt[replay_index], rg,
sizeof(struct rt_msg));
if (replay_index < REPLAY_MAX - 1)
replay_index++;
else
fatalp("Replay index is full\n");
}
if (rlen <= (int)sizeof(struct rt_msghdr)) {
debugp("Got only %d bytes, expecting at least %zu\n", rlen,
sizeof(struct rt_msghdr));
return LDP_E_ROUTE_ERROR;
}
/* Check if we don't have a less specific route */
if (exact_match) {
su = (union sockunion*)(rg->m_space);
if (compare_sockunion(so_dest, su)) {
debugp("Dest %s ", satos(&so_dest->sa));
debugp("not like %s\n", satos(&su->sa));
return LDP_E_NO_SUCH_ROUTE;
}
}
return LDP_E_OK;
}
#endif /* 0 */
/* triggered when a route event occurs */
int
check_route(struct rt_msg * rg, uint rlen)
{
union sockunion *so_dest = NULL, *so_gate = NULL, *so_pref = NULL;
int so_pref_allocated = 0;
int prefixlen;
size_t size_cp;
struct peer_map *pm;
struct label *lab;
char dest[50], gate[50], pref[50], oper[50];
dest[0] = 0;
gate[0] = 0;
pref[0] = 0;
if (rlen <= offsetof(struct rt_msghdr, rtm_type) ||
rg->m_rtm.rtm_version != RTM_VERSION)
return LDP_E_ROUTE_ERROR;
if (rg->m_rtm.rtm_type == RTM_NEWADDR ||
rg->m_rtm.rtm_type == RTM_DELADDR)
return check_if_addr_updown(rg, rlen);
size_cp = sizeof(struct rt_msghdr);
CHECK_MINSA;
if (my_pid == 0)
my_pid = getpid();
assert(my_pid != 0);
if (rg->m_rtm.rtm_pid == my_pid ||
(rg->m_rtm.rtm_pid != 0 && (rg->m_rtm.rtm_flags & RTF_DONE) == 0) ||
(rg->m_rtm.rtm_type != RTM_ADD &&
rg->m_rtm.rtm_type != RTM_DELETE &&
rg->m_rtm.rtm_type != RTM_CHANGE))
return LDP_E_OK;
debugp("Check route triggered by PID: %d\n", rg->m_rtm.rtm_pid);
if (rg->m_rtm.rtm_addrs & RTA_DST)
so_dest = (union sockunion *) rg->m_space;
else
return LDP_E_ROUTE_ERROR;
if (so_dest->sa.sa_family != AF_INET)
return LDP_E_OK;/* We don't care about non-IP changes */
CHECK_LEN(so_dest);
if (rg->m_rtm.rtm_addrs & RTA_GATEWAY) {
GETNEXT(so_gate, so_dest);
if ((rg->m_rtm.rtm_flags & RTF_CONNECTED) == 0 &&
so_gate->sa.sa_family != AF_INET &&
so_gate->sa.sa_family != AF_MPLS)
return LDP_E_OK;
}
if (rg->m_rtm.rtm_addrs & RTA_NETMASK) {
if (so_gate != NULL) {
GETNEXT(so_pref, so_gate);
} else
GETNEXT(so_pref, so_dest);
}
/* Calculate prefixlen */
if (so_pref)
prefixlen = from_union_to_cidr(so_pref);
else {
prefixlen = 32;
if ((so_pref = from_cidr_to_union(32)) == NULL)
return LDP_E_MEMORY;
so_pref_allocated = 1;
}
so_pref->sa.sa_family = AF_INET;
so_pref->sa.sa_len = sizeof(struct sockaddr_in);
so_pref->sin.sin_port = 0;
memset(&so_pref->sin.sin_zero, 0, sizeof(so_pref->sin.sin_zero));
if (rg->m_rtm.rtm_flags & RTF_CONNECTED)
so_gate = NULL;
switch (rg->m_rtm.rtm_type) {
case RTM_CHANGE:
lab = label_get(so_dest, so_pref);
if (lab) {
send_withdraw_tlv_to_all(&so_dest->sa,
prefixlen);
label_reattach_route(lab, REATT_INET_DEL);
label_del(lab);
}
/* Fallthrough */
case RTM_ADD:
/*
* Check if the route is connected. If so, bind it to
* POP_LABEL and send announce. If not, check if the prefix
* was announced by a LDP neighbour and route it there
*/
/* First of all check if we already know this one */
if (label_get(so_dest, so_pref) == NULL) {
/* Just add an IMPLNULL label */
if (so_gate == NULL)
label_add(so_dest, so_pref, NULL,
MPLS_LABEL_IMPLNULL, NULL, 0,
rg->m_rtm.rtm_flags & RTF_HOST);
else {
pm = ldp_test_mapping(&so_dest->sa,
prefixlen, &so_gate->sa);
if (pm) {
/* create an implnull label as it
* gets rewritten in mpls_add_label */
lab = label_add(so_dest, so_pref,
so_gate, MPLS_LABEL_IMPLNULL,
pm->peer, pm->lm->label,
rg->m_rtm.rtm_flags & RTF_HOST);
if (lab != NULL)
mpls_add_label(lab);
free(pm);
} else
label_add(so_dest, so_pref, so_gate,
MPLS_LABEL_IMPLNULL, NULL, 0,
rg->m_rtm.rtm_flags & RTF_HOST);
}
} else /* We already know about this prefix */
fatalp("Binding already there for prefix %s/%d !\n",
satos(&so_dest->sa), prefixlen);
break;
case RTM_DELETE:
/*
* Send withdraw check the binding, delete the route, delete
* the binding
*/
lab = label_get(so_dest, so_pref);
if (!lab)
break;
send_withdraw_tlv_to_all(&so_dest->sa, prefixlen);
/* No readd or delete IP route. Just delete the MPLS route */
label_reattach_route(lab, REATT_INET_NODEL);
label_del(lab);
break;
}
if (!debug_f && !warn_f) {
if(so_pref_allocated)
free(so_pref);
return LDP_E_OK;
}
/* Rest is just for debug */
if (so_dest)
strlcpy(dest, satos(&so_dest->sa), sizeof(dest));
if (so_pref)
snprintf(pref, sizeof(pref), "%d", prefixlen);
if (so_gate)
strlcpy(gate, satos(&so_gate->sa), sizeof(gate));
switch (rg->m_rtm.rtm_type) {
case RTM_ADD:
strlcpy(oper, "added", 20);
break;
case RTM_DELETE:
strlcpy(oper, "delete", 20);
break;
case RTM_GET:
strlcpy(oper, "get", 20);
break;
case RTM_CHANGE:
strlcpy(oper, "change", 20);
break;
case RTM_LOSING:
strlcpy(oper, "losing", 20);
break;
case RTM_REDIRECT:
strlcpy(oper, "redirect", 20);
break;
case RTM_NEWADDR:
strlcpy(oper, "new address", 20);
break;
case RTM_DELADDR:
strlcpy(oper, "del address", 20);
break;
default:
snprintf(oper, sizeof(oper), "unknown 0x%X operation",
rg->m_rtm.rtm_type);
}
debugp("[check_route] Route %s: %s / %s -> %s by PID:%d\n", oper, dest,
pref, gate, rg->m_rtm.rtm_pid);
if(so_pref_allocated)
free(so_pref);
return LDP_E_OK;
}
/*
* Checks NEWADDR and DELADDR messages and sends announcements accordingly
*/
static int
check_if_addr_updown(struct rt_msg * rg, uint rlen)
{
union sockunion *ifa, *netmask;
struct ldp_peer *p;
struct address_list_tlv al_tlv;
struct ifa_msghdr *msghdr = (struct ifa_msghdr *)&rg->m_rtm;
size_t size_cp = sizeof(struct ifa_msghdr);
if (rlen < sizeof(struct ifa_msghdr) ||
(msghdr->ifam_addrs & RTA_NETMASK) == 0 ||
(msghdr->ifam_addrs & RTA_IFA) == 0)
return LDP_E_ROUTE_ERROR;
CHECK_MINSA;
/* we should have RTA_NETMASK, RTA_IFP, RTA_IFA and RTA_BRD */
ifa = netmask = (union sockunion *)(msghdr + 1);
if (netmask->sa.sa_family != AF_INET)
return LDP_E_OK;
CHECK_LEN(netmask);
if (msghdr->ifam_addrs & RTA_IFP)
GETNEXT(ifa, ifa);
GETNEXT(ifa, ifa);
if (ifa->sa.sa_family != AF_INET ||
ntohl(ifa->sin.sin_addr.s_addr) >> 24 == IN_LOOPBACKNET)
return LDP_E_OK;
memset(&al_tlv, 0, sizeof(al_tlv));
al_tlv.type = rg->m_rtm.rtm_type == RTM_NEWADDR ? htons(LDP_ADDRESS) :
htons(LDP_ADDRESS_WITHDRAW);
al_tlv.length = htons(sizeof(al_tlv) - TLV_TYPE_LENGTH);
al_tlv.messageid = htonl(get_message_id());
al_tlv.a_type = htons(TLV_ADDRESS_LIST);
al_tlv.a_length = htons(sizeof(al_tlv.a_af) + sizeof(al_tlv.a_address));
al_tlv.a_af = htons(LDP_AF_INET);
memcpy(&al_tlv.a_address, &ifa->sin.sin_addr, sizeof(al_tlv.a_address));
SLIST_FOREACH(p, &ldp_peer_head, peers)
if (p->state == LDP_PEER_ESTABLISHED)
send_tlv(p, (struct tlv *)&al_tlv);
return LDP_E_OK;
}
int
bind_current_routes()
{
size_t needed, size_cp;
int mib[6];
char *buf, *next, *lim;
struct rt_msghdr *rtmes;
union sockunion *so_dst, *so_pref, *so_gate;
uint rlen;
mib[0] = CTL_NET;
mib[1] = PF_ROUTE;
mib[2] = 0;
mib[3] = 0;
mib[4] = NET_RT_DUMP;
mib[5] = 0;
if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0) {
fatalp("route-sysctl-estimate: %s",
strerror(errno));
return LDP_E_ROUTE_ERROR;
}
if ((buf = malloc(needed)) == 0)
return LDP_E_ROUTE_ERROR;
if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0) {
free(buf);
return LDP_E_ROUTE_ERROR;
}
lim = buf + needed;
for (next = buf; next < lim; next += rlen) {
rtmes = (struct rt_msghdr *) next;
rlen = rtmes->rtm_msglen;
size_cp = sizeof(struct rt_msghdr);
so_gate = so_pref = NULL;
if (!(rtmes->rtm_addrs & RTA_DST)) {
debugp("No dst\n");
continue;
}
CHECK_MINSA;
so_dst = (union sockunion *) & rtmes[1];
CHECK_LEN(so_dst);
/*
* This function is called only at startup, so use
* this occasion to delete all MPLS routes
*/
if (so_dst->sa.sa_family == AF_MPLS) {
delete_route(so_dst, NULL, NO_FREESO);
debugp("MPLS route deleted.\n");
continue;
}
if (so_dst->sa.sa_family != AF_INET) {
/*debugp("sa_dst is not AF_INET\n");*/
continue;
}
/* Check if it's the default gateway */
if (so_dst->sin.sin_addr.s_addr == 0 && no_default_route != 0)
continue;
/* Check if it's loopback */
if ((ntohl(so_dst->sin.sin_addr.s_addr) >> 24)==IN_LOOPBACKNET)
continue;
/* Get Gateway */
if (rtmes->rtm_addrs & RTA_GATEWAY)
GETNEXT(so_gate, so_dst);
/* Get prefix */
if (rtmes->rtm_flags & RTF_HOST) {
if ((so_pref = from_cidr_to_union(32)) == NULL)
return LDP_E_MEMORY;
} else if (rtmes->rtm_addrs & RTA_GATEWAY) {
GETNEXT(so_pref, so_gate);
} else
GETNEXT(so_pref, so_dst);
so_pref->sa.sa_family = AF_INET;
so_pref->sa.sa_len = sizeof(struct sockaddr_in);
so_pref->sin.sin_port = 0;
memset(&so_pref->sin.sin_zero, 0, 8);
/* Also deletes when dest is IPv4 and gateway MPLS */
if ((rtmes->rtm_addrs & RTA_GATEWAY) &&
(so_gate->sa.sa_family == AF_MPLS)) {
debugp("MPLS route to %s deleted.\n",
inet_ntoa(so_dst->sin.sin_addr));
delete_route(so_dst,
rtmes->rtm_flags & RTF_HOST ? NULL : so_pref,
NO_FREESO);
if (rtmes->rtm_flags & RTF_HOST)
free(so_pref);
continue;
}
if (so_gate != NULL && so_gate->sa.sa_family == AF_LINK)
so_gate = NULL; /* connected route */
if (so_gate == NULL || so_gate->sa.sa_family == AF_INET)
label_add(so_dst, so_pref, so_gate,
MPLS_LABEL_IMPLNULL, NULL, 0,
rtmes->rtm_flags & RTF_HOST);
if (rtmes->rtm_flags & RTF_HOST)
free(so_pref);
}
free(buf);
return LDP_E_OK;
}
int
flush_mpls_routes()
{
size_t needed, size_cp;
int mib[6];
uint rlen;
char *buf, *next, *lim;
struct rt_msghdr *rtm;
union sockunion *so_dst, *so_pref, *so_gate;
mib[0] = CTL_NET;
mib[1] = PF_ROUTE;
mib[2] = 0;
mib[3] = 0;
mib[4] = NET_RT_DUMP;
mib[5] = 0;
if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0) {
fatalp("route-sysctl-estimate: %s", strerror(errno));
return LDP_E_ROUTE_ERROR;
}
if ((buf = malloc(needed)) == NULL) {
fatalp("route-sysctl-estimate: %s", strerror(errno));
return LDP_E_MEMORY;
}
if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0) {
free(buf);
return LDP_E_ROUTE_ERROR;
}
lim = buf + needed;
for (next = buf; next < lim; next += rlen) {
rtm = (struct rt_msghdr *) next;
size_cp = sizeof(struct rt_msghdr);
rlen = rtm->rtm_msglen;
so_pref = NULL;
so_gate = NULL;
if (!(rtm->rtm_addrs & RTA_DST)) {
debugp("No dst\n");
continue;
}
so_dst = (union sockunion *) & rtm[1];
if (so_dst->sa.sa_family == AF_MPLS) {
delete_route(so_dst, NULL, NO_FREESO);
debugp("MPLS route deleted.\n");
continue;
}
if ((rtm->rtm_addrs & RTA_GATEWAY) == 0)
continue;
GETNEXT(so_gate, so_dst);
if ((rtm->rtm_flags & RTF_HOST) == 0)
GETNEXT(so_pref, so_gate);
if (so_gate->sa.sa_family == AF_MPLS) {
if (so_dst->sa.sa_family == AF_INET)
debugp("MPLS route to %s deleted.\n",
inet_ntoa(so_dst->sin.sin_addr));
delete_route(so_dst, so_pref, NO_FREESO);
continue;
}
}
free(buf);
return LDP_E_OK;
}
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