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|
/* $OpenBSD: rde.c,v 1.52 2004/01/10 22:25:42 claudio Exp $ */
/*
* Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <errno.h>
#include <pwd.h>
#include <poll.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "bgpd.h"
#include "ensure.h"
#include "mrt.h"
#include "rde.h"
#include "session.h"
#define PFD_PIPE_MAIN 0
#define PFD_PIPE_SESSION 1
void rde_sighdlr(int);
void rde_dispatch_imsg_session(struct imsgbuf *);
void rde_dispatch_imsg_parent(struct imsgbuf *);
int rde_update_dispatch(struct imsg *);
int rde_update_get_prefix(u_char *, u_int16_t, struct in_addr *,
u_int8_t *);
void init_attr_flags(struct attr_flags *);
int rde_update_get_attr(struct rde_peer *, u_char *, u_int16_t,
struct attr_flags *);
void rde_update_err(u_int32_t, enum suberr_update);
void rde_update_log(const char *,
const struct rde_peer *, const struct attr_flags *,
const struct in_addr *, u_int8_t);
void rde_update_queue_runner(void);
void peer_init(struct peer *, u_long);
struct rde_peer *peer_add(u_int32_t, struct peer_config *);
void peer_remove(struct rde_peer *);
struct rde_peer *peer_get(u_int32_t);
void peer_up(u_int32_t, u_int32_t);
void peer_down(u_int32_t);
volatile sig_atomic_t rde_quit = 0;
struct bgpd_config *conf, *nconf;
struct rde_peer_head peerlist;
struct imsgbuf ibuf_se;
struct imsgbuf ibuf_main;
int mrt_flagfilter = 0;
struct mrt_config mrt_filter;
void
rde_sighdlr(int sig)
{
switch (sig) {
case SIGTERM:
rde_quit = 1;
break;
}
}
u_long peerhashsize = 64;
u_long pathhashsize = 1024;
u_long nexthophashsize = 64;
int
rde_main(struct bgpd_config *config, struct peer *peer_l, int pipe_m2r[2],
int pipe_s2r[2])
{
pid_t pid;
struct passwd *pw;
struct pollfd pfd[2];
int n, nfds;
switch (pid = fork()) {
case -1:
fatal("cannot fork");
case 0:
break;
default:
return (pid);
}
conf = config;
if ((pw = getpwnam(BGPD_USER)) == NULL)
fatal("getpwnam");
if (chroot(pw->pw_dir) == -1)
fatal("chroot failed");
chdir("/");
setproctitle("route decision engine");
bgpd_process = PROC_RDE;
if (setgroups(1, &pw->pw_gid) ||
setegid(pw->pw_gid) || setgid(pw->pw_gid) ||
seteuid(pw->pw_uid) || setuid(pw->pw_uid)) {
fatal("can't drop privileges");
}
endpwent();
signal(SIGTERM, rde_sighdlr);
close(pipe_s2r[0]);
close(pipe_m2r[0]);
/* initialize the RIB structures */
peer_init(peer_l, peerhashsize);
path_init(pathhashsize);
nexthop_init(nexthophashsize);
pt_init();
imsg_init(&ibuf_se, pipe_s2r[1]);
imsg_init(&ibuf_main, pipe_m2r[1]);
logit(LOG_INFO, "route decision engine ready");
while (rde_quit == 0) {
bzero(&pfd, sizeof(pfd));
pfd[PFD_PIPE_MAIN].fd = ibuf_main.sock;
pfd[PFD_PIPE_MAIN].events = POLLIN;
if (ibuf_main.w.queued > 0)
pfd[PFD_PIPE_MAIN].events |= POLLOUT;
pfd[PFD_PIPE_SESSION].fd = ibuf_se.sock;
pfd[PFD_PIPE_SESSION].events = POLLIN;
if (ibuf_se.w.queued > 0)
pfd[PFD_PIPE_SESSION].events |= POLLOUT;
if ((nfds = poll(pfd, 2, INFTIM)) == -1)
if (errno != EINTR)
fatal("poll error");
if (nfds > 0 && (pfd[PFD_PIPE_MAIN].revents & POLLOUT) &&
ibuf_main.w.queued)
if ((n = msgbuf_write(&ibuf_main.w)) < 0)
fatal("pipe write error");
if (nfds > 0 && pfd[PFD_PIPE_MAIN].revents & POLLIN) {
nfds--;
rde_dispatch_imsg_parent(&ibuf_main);
}
if (nfds > 0 && (pfd[PFD_PIPE_SESSION].revents & POLLOUT) &&
ibuf_se.w.queued)
if ((n = msgbuf_write(&ibuf_se.w)) < 0)
fatal("pipe write error");
if (nfds > 0 && pfd[PFD_PIPE_SESSION].revents & POLLIN) {
nfds--;
rde_dispatch_imsg_session(&ibuf_se);
}
rde_update_queue_runner();
}
logit(LOG_INFO, "route decision engine exiting");
_exit(0);
}
void
rde_dispatch_imsg_session(struct imsgbuf *ibuf)
{
struct imsg imsg;
u_int32_t rid;
int n;
if ((n = imsg_read(ibuf)) == -1)
fatal("rde_dispatch_imsg_session: imsg_read error");
if (n == 0) /* connection closed */
fatal("rde_dispatch_imsg_session: pipe closed");
for (;;) {
if ((n = imsg_get(ibuf, &imsg)) == -1)
fatal("rde_dispatch_imsg_session: imsg_read error");
if (n == 0)
break;
switch (imsg.hdr.type) {
case IMSG_UPDATE:
rde_update_dispatch(&imsg);
break;
case IMSG_SESSION_UP:
if (imsg.hdr.len - IMSG_HEADER_SIZE != sizeof(rid))
fatalx("incorrect size of session request");
memcpy(&rid, imsg.data, sizeof(rid));
peer_up(imsg.hdr.peerid, rid);
break;
case IMSG_SESSION_DOWN:
peer_down(imsg.hdr.peerid);
break;
default:
break;
}
imsg_free(&imsg);
}
}
void
rde_dispatch_imsg_parent(struct imsgbuf *ibuf)
{
struct imsg imsg;
struct mrt_config mrt;
struct peer_config *pconf;
struct rde_peer *p, *np;
int n;
if ((n = imsg_read(ibuf)) == -1)
fatal("rde_dispatch_imsg_parent: imsg_read error");
if (n == 0) /* connection closed */
fatal("rde_dispatch_imsg_parent: pipe closed");
for (;;) {
if ((n = imsg_get(ibuf, &imsg)) == -1)
fatal("rde_dispatch_imsg_parent: imsg_read error");
if (n == 0)
break;
switch (imsg.hdr.type) {
case IMSG_RECONF_CONF:
if ((nconf = malloc(sizeof(struct bgpd_config))) ==
NULL)
fatal(NULL);
memcpy(nconf, imsg.data, sizeof(struct bgpd_config));
break;
case IMSG_RECONF_PEER:
pconf = imsg.data;
if ((p = peer_get(pconf->id)) == NULL)
p = peer_add(pconf->id, pconf);
else
memcpy(&p->conf, pconf,
sizeof(struct peer_config));
p->conf.reconf_action = RECONF_KEEP;
break;
case IMSG_RECONF_DONE:
if (nconf == NULL)
fatalx("got IMSG_RECONF_DONE but no config");
for (p = LIST_FIRST(&peerlist);
p != LIST_END(&peerlist); p = np) {
np = LIST_NEXT(p, peer_l);
switch (p->conf.reconf_action) {
case RECONF_NONE:
peer_remove(p);
break;
case RECONF_KEEP:
/* reset state */
p->conf.reconf_action = RECONF_NONE;
break;
default:
break;
}
}
memcpy(conf, nconf, sizeof(struct bgpd_config));
free(nconf);
nconf = NULL;
logit(LOG_INFO, "RDE reconfigured");
break;
case IMSG_NEXTHOP_UPDATE:
nexthop_update(imsg.data);
break;
case IMSG_MRT_REQ:
memcpy(&mrt, imsg.data, sizeof(mrt));
mrt.msgbuf = &ibuf_main.w;
if (mrt.type == MRT_TABLE_DUMP) {
mrt_clear_seq();
pt_dump(mrt_dump_upcall, &mrt);
if (imsg_compose(&ibuf_main, IMSG_MRT_END,
mrt.id, NULL, 0) == -1)
fatalx("imsg_compose error");
} else if (mrt.type == MRT_FILTERED_IN) {
mrt_flagfilter = 1;
memcpy(&mrt_filter, &mrt, sizeof(mrt_filter));
}
break;
case IMSG_MRT_END:
memcpy(&mrt, imsg.data, sizeof(mrt));
/* ignore end message because a dump is atomic */
if (mrt.type == MRT_FILTERED_IN) {
mrt_flagfilter = 0;
bzero(&mrt_filter, sizeof(mrt_filter));
}
break;
default:
break;
}
imsg_free(&imsg);
}
}
/* handle routing updates from the session engine. */
int
rde_update_dispatch(struct imsg *imsg)
{
struct rde_peer *peer;
u_char *p;
int pos;
u_int16_t len;
u_int16_t withdrawn_len;
u_int16_t attrpath_len;
u_int16_t nlri_len;
u_int8_t prefixlen;
struct in_addr prefix;
struct attr_flags attrs;
peer = peer_get(imsg->hdr.peerid);
if (peer == NULL) /* unknown peer, cannot happen */
return (-1);
if (peer->state != PEER_UP)
return (-1); /* peer is not yet up, cannot happen */
if (mrt_flagfilter == 1)
mrt_dump_bgp_msg(&mrt_filter, imsg->data,
imsg->hdr.len - IMSG_HEADER_SIZE, UPDATE,
&peer->conf, conf);
p = imsg->data;
memcpy(&len, p, 2);
withdrawn_len = ntohs(len);
p += 2;
if (imsg->hdr.len < IMSG_HEADER_SIZE + 2 + withdrawn_len + 2) {
rde_update_err(peer->conf.id, ERR_UPD_ATTRLIST);
return (-1);
}
while (withdrawn_len > 0) {
if ((pos = rde_update_get_prefix(p, withdrawn_len, &prefix,
&prefixlen)) == -1) {
rde_update_err(peer->conf.id, ERR_UPD_ATTRLIST);
return (-1);
}
p += pos;
withdrawn_len -= pos;
rde_update_log("withdraw", peer, NULL, &prefix, prefixlen);
prefix_remove(peer, prefix, prefixlen);
}
memcpy(&len, p, 2);
attrpath_len = ntohs(len);
p += 2;
if (imsg->hdr.len <
IMSG_HEADER_SIZE + 2 + withdrawn_len + 2 + attrpath_len) {
rde_update_err(peer->conf.id, ERR_UPD_ATTRLIST);
return (-1);
}
nlri_len =
imsg->hdr.len - IMSG_HEADER_SIZE - 4 - withdrawn_len - attrpath_len;
if (attrpath_len == 0) /* 0 = no NLRI information in this message */
return (0);
init_attr_flags(&attrs);
while (attrpath_len > 0) {
if ((pos = rde_update_get_attr(peer, p, attrpath_len,
&attrs)) < 0) {
rde_update_err(peer->conf.id, ERR_UPD_ATTRLIST);
return (-1);
}
p += pos;
attrpath_len -= pos;
}
while (nlri_len > 0) {
if ((pos = rde_update_get_prefix(p, nlri_len, &prefix,
&prefixlen)) == -1) {
rde_update_err(peer->conf.id, ERR_UPD_ATTRLIST);
return (-1);
}
p += pos;
nlri_len -= pos;
rde_update_log("update", peer, &attrs, &prefix, prefixlen);
path_update(peer, &attrs, prefix, prefixlen);
}
/* need to free allocated attribute memory that is no longer used */
aspath_destroy(attrs.aspath);
return (0);
}
int
rde_update_get_prefix(u_char *p, u_int16_t len, struct in_addr *prefix,
u_int8_t *prefixlen)
{
int i;
u_int8_t pfxlen;
u_int16_t plen;
union {
struct in_addr addr32;
u_int8_t addr8[4];
} addr;
if (len < 1)
return (-1);
memcpy(&pfxlen, p, 1);
p += 1;
plen = 1;
addr.addr32.s_addr = 0;
for (i = 0; i <= 3; i++) {
if (pfxlen > i * 8) {
if (len - plen < 1)
return (-1);
memcpy(&addr.addr8[i], p++, 1);
plen++;
}
}
prefix->s_addr = addr.addr32.s_addr;
*prefixlen = pfxlen;
return (plen);
}
#define UPD_READ(t, p, plen, n) \
do { \
memcpy(t, p, n); \
p += n; \
plen += n; \
} while (0)
void
init_attr_flags(struct attr_flags *a)
{
bzero(a, sizeof(struct attr_flags));
a->origin = ORIGIN_INCOMPLETE;
TAILQ_INIT(&a->others);
}
int
rde_update_get_attr(struct rde_peer *peer, u_char *p, u_int16_t len,
struct attr_flags *a)
{
u_int32_t tmp32;
u_int16_t attr_len;
u_int16_t plen = 0;
u_int8_t flags;
u_int8_t type;
u_int8_t tmp8;
int r; /* XXX */
if (len < 3)
return (-1);
UPD_READ(&flags, p, plen, 1);
UPD_READ(&type, p, plen, 1);
if (flags & ATTR_EXTLEN) {
if (len - plen < 2)
return (-1);
UPD_READ(&attr_len, p, plen, 2);
} else {
UPD_READ(&tmp8, p, plen, 1);
attr_len = tmp8;
}
if (len - plen < attr_len)
return (-1);
switch (type) {
case ATTR_UNDEF:
/* error! */
return (-1);
case ATTR_ORIGIN:
if (attr_len != 1)
return (-1);
UPD_READ(&a->origin, p, plen, 1);
break;
case ATTR_ASPATH:
if ((r = aspath_verify(p, attr_len, conf->as)) != 0) {
/* XXX could also be a aspath loop but this
* check should be moved to the filtering. */
logit(LOG_INFO,
"XXX aspath_verify failed: error %i\n", r);
return (-1);
}
a->aspath = aspath_create(p, attr_len);
plen += attr_len;
break;
case ATTR_NEXTHOP:
if (attr_len != 4)
return (-1);
UPD_READ(&a->nexthop, p, plen, 4); /* network byte order */
break;
case ATTR_MED:
if (attr_len != 4)
return (-1);
UPD_READ(&tmp32, p, plen, 4);
a->med = ntohl(tmp32);
break;
case ATTR_LOCALPREF:
if (attr_len != 4)
return (-1);
if (peer->conf.ebgp) {
/* ignore local-pref attr for non ibgp peers */
a->lpref = 0; /* set a default value */
break;
}
UPD_READ(&tmp32, p, plen, 4);
a->lpref = ntohl(tmp32);
break;
case ATTR_ATOMIC_AGGREGATE:
case ATTR_AGGREGATOR:
default:
attr_optadd(a, flags, type, p, attr_len);
plen += attr_len;
break;
}
return (plen);
}
void
rde_update_err(u_int32_t peerid, enum suberr_update errorcode)
{
u_int8_t errcode;
errcode = errorcode;
if (imsg_compose(&ibuf_se, IMSG_UPDATE_ERR, peerid,
&errcode, sizeof(errcode)) == -1)
fatal("imsg_compose error");
}
void
rde_update_log(const char *message,
const struct rde_peer *peer, const struct attr_flags *attr,
const struct in_addr *prefix, u_int8_t prefixlen)
{
char *neighbor;
char *nexthop = NULL;
if (! (conf->log & BGPD_LOG_UPDATES))
return;
neighbor = strdup(inet_ntoa(peer->conf.remote_addr.sin_addr));
if (neighbor == NULL)
return;
if (attr != NULL) {
asprintf(&nexthop, " via %s", inet_ntoa(attr->nexthop));
}
logit(LOG_DEBUG, "neighbor %s (AS%u) %s %s/%u"
"%s",
neighbor, peer->conf.remote_as, message,
inet_ntoa(*prefix), prefixlen,
nexthop ? nexthop : "");
free(neighbor);
free(nexthop);
}
/*
* kroute specific functions
*/
void
rde_send_kroute(struct prefix *new, struct prefix *old)
{
struct kroute kr;
struct prefix *p;
enum imsg_type type;
if ((old == NULL || old->aspath->nexthop == NULL ||
old->aspath->nexthop->state != NEXTHOP_REACH) &&
(new == NULL || new->aspath->nexthop == NULL ||
new->aspath->nexthop->state != NEXTHOP_REACH))
return;
if (new == NULL || new->aspath->nexthop == NULL ||
new->aspath->nexthop->state != NEXTHOP_REACH) {
type = IMSG_KROUTE_DELETE;
p = old;
kr.nexthop = 0;
} else {
type = IMSG_KROUTE_CHANGE;
p = new;
kr.nexthop = p->aspath->nexthop->true_nexthop.s_addr;
}
kr.prefix = p->prefix->prefix.s_addr;
kr.prefixlen = p->prefix->prefixlen;
if (imsg_compose(&ibuf_main, type, 0, &kr, sizeof(kr)) == -1)
fatal("imsg_compose error");
}
/*
* nexthop specific functions
*/
void
rde_send_nexthop(in_addr_t next, int valid)
{
int type;
if (valid)
type = IMSG_NEXTHOP_ADD;
else
type = IMSG_NEXTHOP_REMOVE;
if (imsg_compose(&ibuf_main, type, 0, &next, sizeof(next)) == -1)
fatal("imsg_compose error");
}
/*
* update specific functions
*/
u_char queue_buf[4096];
u_int16_t
rde_local_as(void)
{
return conf->as;
}
void
rde_update_queue_runner(void)
{
struct rde_peer *peer;
int r, sent;
u_int16_t len, wd_len, wpos;
len = sizeof(queue_buf) - MSGSIZE_HEADER;
do {
sent = 0;
LIST_FOREACH(peer, &peerlist, peer_l) {
if (peer->state != PEER_UP)
continue;
/* first withdraws */
wpos = 2; /* reserve space for the lenght field */
r = up_dump_prefix(queue_buf + wpos, len - wpos - 2,
&peer->withdraws, peer);
wd_len = r;
/* write withdraws lenght filed */
wd_len = htons(wd_len);
memcpy(queue_buf, &wd_len, 2);
wpos += r;
/* now bgp path attributes */
r = up_dump_attrnlri(queue_buf + wpos, len - wpos,
peer);
wpos += r;
if (wpos == 4)
/*
* No packet to send. The 4 bytes are the
* needed withdraw and path attribute lenght.
*/
continue;
/* finally send message to SE */
if (imsg_compose(&ibuf_se, IMSG_UPDATE, peer->conf.id,
queue_buf, wpos) == -1)
fatal("imsg_compose error");
sent++;
}
} while (sent != 0);
}
/*
* peer functions
*/
struct peer_table {
struct rde_peer_head *peer_hashtbl;
u_long peer_hashmask;
} peertable;
#define PEER_HASH(x) \
&peertable.peer_hashtbl[(x) & peertable.peer_hashmask]
void
peer_init(struct peer *peer_l, u_long hashsize)
{
struct peer *p, *next;
u_long hs, i;
for (hs = 1; hs < hashsize; hs <<= 1)
;
peertable.peer_hashtbl = calloc(hs, sizeof(struct rde_peer_head));
if (peertable.peer_hashtbl == NULL)
fatal("peer_init");
for (i = 0; i < hs; i++)
LIST_INIT(&peertable.peer_hashtbl[i]);
LIST_INIT(&peerlist);
peertable.peer_hashmask = hs - 1;
for (p = peer_l; p != NULL; p = next) {
next = p->next;
p->conf.reconf_action = RECONF_NONE;
peer_add(p->conf.id, &p->conf);
free(p);
}
peer_l = NULL;
}
struct rde_peer *
peer_get(u_int32_t id)
{
struct rde_peer_head *head;
struct rde_peer *peer;
head = PEER_HASH(id);
ENSURE(head != NULL);
LIST_FOREACH(peer, head, hash_l) {
if (peer->conf.id == id)
return peer;
}
return NULL;
}
struct rde_peer *
peer_add(u_int32_t id, struct peer_config *p_conf)
{
struct rde_peer_head *head;
struct rde_peer *peer;
ENSURE(peer_get(id) == NULL);
peer = calloc(1, sizeof(struct rde_peer));
if (peer == NULL)
fatal("peer_add");
LIST_INIT(&peer->path_h);
memcpy(&peer->conf, p_conf, sizeof(struct peer_config));
peer->remote_bgpid = 0;
peer->state = PEER_NONE;
up_init(peer);
head = PEER_HASH(id);
ENSURE(head != NULL);
LIST_INSERT_HEAD(head, peer, hash_l);
LIST_INSERT_HEAD(&peerlist, peer, peer_l);
return (peer);
}
void
peer_remove(struct rde_peer *peer)
{
/*
* If the session is up we wait until we get the IMSG_SESSION_DOWN
* message. If the session is down or was never up we delete the
* peer.
*/
if (peer->state == PEER_UP) {
peer->conf.reconf_action = RECONF_DELETE;
} else {
ENSURE(peer_get(peer->conf.id) != NULL);
ENSURE(LIST_EMPTY(&peer->path_h));
LIST_REMOVE(peer, hash_l);
LIST_REMOVE(peer, peer_l);
free(peer);
}
}
void
peer_up(u_int32_t id, u_int32_t rid)
{
struct rde_peer *peer;
peer = peer_get(id);
if (peer == NULL) {
logit(LOG_CRIT, "peer_up: unknown peer id %d", id);
return;
}
peer->remote_bgpid = ntohl(rid);
peer->state = PEER_UP;
up_init(peer);
}
void
peer_down(u_int32_t id)
{
struct rde_peer *peer;
struct rde_aspath *asp, *nasp;
peer = peer_get(id);
if (peer == NULL) {
logit(LOG_CRIT, "peer_down: unknown peer id &d", id);
return;
}
peer->remote_bgpid = 0;
peer->state = PEER_DOWN;
up_down(peer);
/* walk through per peer RIB list and remove all prefixes. */
for (asp = LIST_FIRST(&peer->path_h);
asp != LIST_END(&peer->path_h);
asp = nasp) {
nasp = LIST_NEXT(asp, peer_l);
path_remove(asp);
}
LIST_INIT(&peer->path_h);
if (peer->conf.reconf_action == RECONF_DELETE)
peer_remove(peer);
}
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