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|
/* $OpenBSD$ */
/*
* Copyright (c) 2013, 2016 Renato Westphal <renato@openbsd.org>
* Copyright (c) 2009 Michele Marchetto <michele@openbsd.org>
* Copyright (c) 2004, 2005, 2008 Esben Norby <norby@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 <zebra.h>
#include "ldpd.h"
#include "ldpe.h"
#include "log.h"
#include "sockopt.h"
static struct iface *disc_find_iface(unsigned int, int,
union ldpd_addr *, int);
static int session_read(struct thread *);
static int session_write(struct thread *);
static ssize_t session_get_pdu(struct ibuf_read *, char **);
static void tcp_close(struct tcp_conn *);
static struct pending_conn *pending_conn_new(int, int, union ldpd_addr *);
static int pending_conn_timeout(struct thread *);
int
gen_ldp_hdr(struct ibuf *buf, uint16_t size)
{
struct ldp_hdr ldp_hdr;
memset(&ldp_hdr, 0, sizeof(ldp_hdr));
ldp_hdr.version = htons(LDP_VERSION);
/* exclude the 'Version' and 'PDU Length' fields from the total */
ldp_hdr.length = htons(size - LDP_HDR_DEAD_LEN);
ldp_hdr.lsr_id = ldp_rtr_id_get(leconf);
ldp_hdr.lspace_id = 0;
return (ibuf_add(buf, &ldp_hdr, LDP_HDR_SIZE));
}
int
gen_msg_hdr(struct ibuf *buf, uint16_t type, uint16_t size)
{
static int msgcnt = 0;
struct ldp_msg msg;
memset(&msg, 0, sizeof(msg));
msg.type = htons(type);
/* exclude the 'Type' and 'Length' fields from the total */
msg.length = htons(size - LDP_MSG_DEAD_LEN);
msg.id = htonl(++msgcnt);
return (ibuf_add(buf, &msg, sizeof(msg)));
}
/* send packets */
int
send_packet(int fd, int af, union ldpd_addr *dst, struct iface_af *ia,
void *pkt, size_t len)
{
struct sockaddr *sa;
switch (af) {
case AF_INET:
if (ia && IN_MULTICAST(ntohl(dst->v4.s_addr))) {
/* set outgoing interface for multicast traffic */
if (sock_set_ipv4_mcast(ia->iface) == -1) {
log_debug("%s: error setting multicast "
"interface, %s", __func__, ia->iface->name);
return (-1);
}
}
break;
case AF_INET6:
if (ia && IN6_IS_ADDR_MULTICAST(&dst->v6)) {
/* set outgoing interface for multicast traffic */
if (sock_set_ipv6_mcast(ia->iface) == -1) {
log_debug("%s: error setting multicast "
"interface, %s", __func__, ia->iface->name);
return (-1);
}
}
break;
default:
fatalx("send_packet: unknown af");
}
sa = addr2sa(af, dst, LDP_PORT);
if (sendto(fd, pkt, len, 0, sa, sockaddr_len(sa)) == -1) {
log_warn("%s: error sending packet to %s", __func__,
log_sockaddr(sa));
return (-1);
}
return (0);
}
/* Discovery functions */
int
disc_recv_packet(struct thread *thread)
{
int fd = THREAD_FD(thread);
struct thread **threadp = THREAD_ARG(thread);
union {
struct cmsghdr hdr;
#ifdef HAVE_STRUCT_SOCKADDR_DL
char buf[CMSG_SPACE(sizeof(struct sockaddr_dl))];
#else
char buf[CMSG_SPACE(sizeof(struct in6_pktinfo))];
#endif
} cmsgbuf;
struct msghdr m;
struct sockaddr_storage from;
struct iovec iov;
char *buf;
#ifndef MSG_MCAST
struct cmsghdr *cmsg;
#endif
ssize_t r;
int multicast;
int af;
union ldpd_addr src;
unsigned int ifindex = 0;
struct iface *iface;
uint16_t len;
struct ldp_hdr ldp_hdr;
uint16_t pdu_len;
struct ldp_msg msg;
uint16_t msg_len;
struct in_addr lsr_id;
/* reschedule read */
*threadp = thread_add_read(master, disc_recv_packet, threadp, fd);
/* setup buffer */
memset(&m, 0, sizeof(m));
iov.iov_base = buf = pkt_ptr;
iov.iov_len = IBUF_READ_SIZE;
m.msg_name = &from;
m.msg_namelen = sizeof(from);
m.msg_iov = &iov;
m.msg_iovlen = 1;
m.msg_control = &cmsgbuf.buf;
m.msg_controllen = sizeof(cmsgbuf.buf);
if ((r = recvmsg(fd, &m, 0)) == -1) {
if (errno != EAGAIN && errno != EINTR)
log_debug("%s: read error: %s", __func__,
strerror(errno));
return (0);
}
sa2addr((struct sockaddr *)&from, &af, &src, NULL);
#ifdef MSG_MCAST
multicast = (m.msg_flags & MSG_MCAST) ? 1 : 0;
#else
multicast = 0;
for (cmsg = CMSG_FIRSTHDR(&m); cmsg != NULL;
cmsg = CMSG_NXTHDR(&m, cmsg)) {
#if defined(HAVE_IP_PKTINFO)
if (af == AF_INET && cmsg->cmsg_level == IPPROTO_IP &&
cmsg->cmsg_type == IP_PKTINFO) {
struct in_pktinfo *pktinfo;
pktinfo = (struct in_pktinfo *)CMSG_DATA(cmsg);
if (IN_MULTICAST(ntohl(pktinfo->ipi_addr.s_addr)))
multicast = 1;
break;
}
#elif defined(HAVE_IP_RECVDSTADDR)
if (af == AF_INET && cmsg->cmsg_level == IPPROTO_IP &&
cmsg->cmsg_type == IP_RECVDSTADDR) {
struct in_addr *addr;
addr = (struct in_addr *)CMSG_DATA(cmsg);
if (IN_MULTICAST(ntohl(addr->s_addr)))
multicast = 1;
break;
}
#else
#error "Unsupported socket API"
#endif
if (af == AF_INET6 && cmsg->cmsg_level == IPPROTO_IPV6 &&
cmsg->cmsg_type == IPV6_PKTINFO) {
struct in6_pktinfo *pktinfo;
pktinfo = (struct in6_pktinfo *)CMSG_DATA(cmsg);
if (IN6_IS_ADDR_MULTICAST(&pktinfo->ipi6_addr))
multicast = 1;
break;
}
}
#endif /* MSG_MCAST */
if (bad_addr(af, &src)) {
log_debug("%s: invalid source address: %s", __func__,
log_addr(af, &src));
return (0);
}
ifindex = getsockopt_ifindex(af, &m);
/* find a matching interface */
iface = disc_find_iface(ifindex, af, &src, multicast);
if (iface == NULL)
return (0);
/* check packet size */
len = (uint16_t)r;
if (len < (LDP_HDR_SIZE + LDP_MSG_SIZE) || len > LDP_MAX_LEN) {
log_debug("%s: bad packet size, source %s", __func__,
log_addr(af, &src));
return (0);
}
/* LDP header sanity checks */
memcpy(&ldp_hdr, buf, sizeof(ldp_hdr));
if (ntohs(ldp_hdr.version) != LDP_VERSION) {
log_debug("%s: invalid LDP version %d, source %s", __func__,
ntohs(ldp_hdr.version), log_addr(af, &src));
return (0);
}
if (ntohs(ldp_hdr.lspace_id) != 0) {
log_debug("%s: invalid label space %u, source %s", __func__,
ntohs(ldp_hdr.lspace_id), log_addr(af, &src));
return (0);
}
/* check "PDU Length" field */
pdu_len = ntohs(ldp_hdr.length);
if ((pdu_len < (LDP_HDR_PDU_LEN + LDP_MSG_SIZE)) ||
(pdu_len > (len - LDP_HDR_DEAD_LEN))) {
log_debug("%s: invalid LDP packet length %u, source %s",
__func__, ntohs(ldp_hdr.length), log_addr(af, &src));
return (0);
}
buf += LDP_HDR_SIZE;
len -= LDP_HDR_SIZE;
lsr_id.s_addr = ldp_hdr.lsr_id;
/*
* For UDP, we process only the first message of each packet. This does
* not impose any restrictions since LDP uses UDP only for sending Hello
* packets.
*/
memcpy(&msg, buf, sizeof(msg));
/* check "Message Length" field */
msg_len = ntohs(msg.length);
if (msg_len < LDP_MSG_LEN || ((msg_len + LDP_MSG_DEAD_LEN) > pdu_len)) {
log_debug("%s: invalid LDP message length %u, source %s",
__func__, ntohs(msg.length), log_addr(af, &src));
return (0);
}
buf += LDP_MSG_SIZE;
len -= LDP_MSG_SIZE;
/* switch LDP packet type */
switch (ntohs(msg.type)) {
case MSG_TYPE_HELLO:
recv_hello(lsr_id, &msg, af, &src, iface, multicast, buf, len);
break;
default:
log_debug("%s: unknown LDP packet type, source %s", __func__,
log_addr(af, &src));
}
return (0);
}
static struct iface *
disc_find_iface(unsigned int ifindex, int af, union ldpd_addr *src,
int multicast)
{
struct iface *iface;
struct iface_af *ia;
iface = if_lookup(leconf, ifindex);
if (iface == NULL)
return (NULL);
ia = iface_af_get(iface, af);
if (!ia->enabled)
return (NULL);
/*
* RFC 7552 - Section 5.1:
* "Link-local IPv6 address MUST be used as the source IP address in
* IPv6 LDP Link Hellos".
*/
if (multicast && af == AF_INET6 && !IN6_IS_ADDR_LINKLOCAL(&src->v6))
return (NULL);
return (iface);
}
int
session_accept(struct thread *thread)
{
int fd = THREAD_FD(thread);
struct sockaddr_storage src;
socklen_t len = sizeof(src);
int newfd;
int af;
union ldpd_addr addr;
struct nbr *nbr;
struct pending_conn *pconn;
newfd = accept(fd, (struct sockaddr *)&src, &len);
if (newfd == -1) {
/*
* Pause accept if we are out of file descriptors, or
* libevent will haunt us here too.
*/
if (errno == ENFILE || errno == EMFILE) {
accept_pause();
} else if (errno != EWOULDBLOCK && errno != EINTR &&
errno != ECONNABORTED)
log_debug("%s: accept error: %s", __func__,
strerror(errno));
return (0);
}
sock_set_nonblock(newfd);
sa2addr((struct sockaddr *)&src, &af, &addr, NULL);
/*
* Since we don't support label spaces, we can identify this neighbor
* just by its source address. This way we don't need to wait for its
* Initialization message to know who we are talking to.
*/
nbr = nbr_find_addr(af, &addr);
if (nbr == NULL) {
/*
* According to RFC 5036, we would need to send a No Hello
* Error Notification message and close this TCP connection
* right now. But doing so would trigger the backoff exponential
* timer in the remote peer, which would considerably slow down
* the session establishment process. The trick here is to wait
* five seconds before sending the Notification Message. There's
* a good chance that the remote peer will send us a Hello
* message within this interval, so it's worth waiting before
* taking a more drastic measure.
*/
pconn = pending_conn_find(af, &addr);
if (pconn)
close(newfd);
else
pending_conn_new(newfd, af, &addr);
return (0);
}
/* protection against buggy implementations */
if (nbr_session_active_role(nbr)) {
close(newfd);
return (0);
}
if (nbr->state != NBR_STA_PRESENT) {
log_debug("%s: lsr-id %s: rejecting additional transport "
"connection", __func__, inet_ntoa(nbr->id));
close(newfd);
return (0);
}
session_accept_nbr(nbr, newfd);
return (0);
}
void
session_accept_nbr(struct nbr *nbr, int fd)
{
#ifdef __OpenBSD__
struct nbr_params *nbrp;
int opt;
socklen_t len;
nbrp = nbr_params_find(leconf, nbr->id);
if (nbr_gtsm_check(fd, nbr, nbrp)) {
close(fd);
return;
}
if (nbrp && nbrp->auth.method == AUTH_MD5SIG) {
if (sysdep.no_pfkey || sysdep.no_md5sig) {
log_warnx("md5sig configured but not available");
close(fd);
return;
}
len = sizeof(opt);
if (getsockopt(fd, IPPROTO_TCP, TCP_MD5SIG, &opt, &len) == -1)
fatal("getsockopt TCP_MD5SIG");
if (!opt) { /* non-md5'd connection! */
log_warnx("connection attempt without md5 signature");
close(fd);
return;
}
}
#endif
nbr->tcp = tcp_new(fd, nbr);
nbr_fsm(nbr, NBR_EVT_MATCH_ADJ);
}
static int
session_read(struct thread *thread)
{
int fd = THREAD_FD(thread);
struct nbr *nbr = THREAD_ARG(thread);
struct tcp_conn *tcp = nbr->tcp;
struct ldp_hdr *ldp_hdr;
struct ldp_msg *msg;
char *buf = NULL, *pdu;
ssize_t n, len;
uint16_t pdu_len, msg_len, msg_size, max_pdu_len;
int ret;
tcp->rev = thread_add_read(master, session_read, nbr, fd);
if ((n = read(fd, tcp->rbuf->buf + tcp->rbuf->wpos,
sizeof(tcp->rbuf->buf) - tcp->rbuf->wpos)) == -1) {
if (errno != EINTR && errno != EAGAIN) {
log_warn("%s: read error", __func__);
nbr_fsm(nbr, NBR_EVT_CLOSE_SESSION);
return (0);
}
/* retry read */
return (0);
}
if (n == 0) {
/* connection closed */
log_debug("%s: connection closed by remote end", __func__);
nbr_fsm(nbr, NBR_EVT_CLOSE_SESSION);
return (0);
}
tcp->rbuf->wpos += n;
while ((len = session_get_pdu(tcp->rbuf, &buf)) > 0) {
pdu = buf;
ldp_hdr = (struct ldp_hdr *)pdu;
if (ntohs(ldp_hdr->version) != LDP_VERSION) {
session_shutdown(nbr, S_BAD_PROTO_VER, 0, 0);
free(buf);
return (0);
}
pdu_len = ntohs(ldp_hdr->length);
/*
* RFC 5036 - Section 3.5.3:
* "Prior to completion of the negotiation, the maximum
* allowable length is 4096 bytes".
*/
if (nbr->state == NBR_STA_OPER)
max_pdu_len = nbr->max_pdu_len;
else
max_pdu_len = LDP_MAX_LEN;
if (pdu_len < (LDP_HDR_PDU_LEN + LDP_MSG_SIZE) ||
pdu_len > max_pdu_len) {
session_shutdown(nbr, S_BAD_PDU_LEN, 0, 0);
free(buf);
return (0);
}
pdu_len -= LDP_HDR_PDU_LEN;
if (ldp_hdr->lsr_id != nbr->id.s_addr ||
ldp_hdr->lspace_id != 0) {
session_shutdown(nbr, S_BAD_LDP_ID, 0, 0);
free(buf);
return (0);
}
pdu += LDP_HDR_SIZE;
len -= LDP_HDR_SIZE;
nbr_fsm(nbr, NBR_EVT_PDU_RCVD);
while (len >= LDP_MSG_SIZE) {
uint16_t type;
msg = (struct ldp_msg *)pdu;
type = ntohs(msg->type);
msg_len = ntohs(msg->length);
if (msg_len < LDP_MSG_LEN ||
(msg_len + LDP_MSG_DEAD_LEN) > pdu_len) {
session_shutdown(nbr, S_BAD_TLV_LEN, msg->id,
msg->type);
free(buf);
return (0);
}
msg_size = msg_len + LDP_MSG_DEAD_LEN;
pdu_len -= msg_size;
/* check for error conditions earlier */
switch (type) {
case MSG_TYPE_INIT:
if ((nbr->state != NBR_STA_INITIAL) &&
(nbr->state != NBR_STA_OPENSENT)) {
session_shutdown(nbr, S_SHUTDOWN,
msg->id, msg->type);
free(buf);
return (0);
}
break;
case MSG_TYPE_KEEPALIVE:
if ((nbr->state == NBR_STA_INITIAL) ||
(nbr->state == NBR_STA_OPENSENT)) {
session_shutdown(nbr, S_SHUTDOWN,
msg->id, msg->type);
free(buf);
return (0);
}
break;
default:
if (nbr->state != NBR_STA_OPER) {
session_shutdown(nbr, S_SHUTDOWN,
msg->id, msg->type);
free(buf);
return (0);
}
break;
}
/* switch LDP packet type */
switch (type) {
case MSG_TYPE_NOTIFICATION:
ret = recv_notification(nbr, pdu, msg_size);
break;
case MSG_TYPE_INIT:
ret = recv_init(nbr, pdu, msg_size);
break;
case MSG_TYPE_KEEPALIVE:
ret = recv_keepalive(nbr, pdu, msg_size);
break;
case MSG_TYPE_CAPABILITY:
ret = recv_capability(nbr, pdu, msg_size);
break;
case MSG_TYPE_ADDR:
case MSG_TYPE_ADDRWITHDRAW:
ret = recv_address(nbr, pdu, msg_size);
break;
case MSG_TYPE_LABELMAPPING:
case MSG_TYPE_LABELREQUEST:
case MSG_TYPE_LABELWITHDRAW:
case MSG_TYPE_LABELRELEASE:
case MSG_TYPE_LABELABORTREQ:
ret = recv_labelmessage(nbr, pdu, msg_size,
type);
break;
default:
log_debug("%s: unknown LDP message from nbr %s",
__func__, inet_ntoa(nbr->id));
if (!(ntohs(msg->type) & UNKNOWN_FLAG))
send_notification(nbr->tcp,
S_UNKNOWN_MSG, msg->id, msg->type);
/* ignore the message */
ret = 0;
break;
}
if (ret == -1) {
/* parser failed, giving up */
free(buf);
return (0);
}
/* Analyse the next message */
pdu += msg_size;
len -= msg_size;
}
free(buf);
if (len != 0) {
session_shutdown(nbr, S_BAD_PDU_LEN, 0, 0);
return (0);
}
}
return (0);
}
static int
session_write(struct thread *thread)
{
struct tcp_conn *tcp = THREAD_ARG(thread);
struct nbr *nbr = tcp->nbr;
tcp->wbuf.ev = NULL;
if (msgbuf_write(&tcp->wbuf.wbuf) <= 0)
if (errno != EAGAIN && nbr)
nbr_fsm(nbr, NBR_EVT_CLOSE_SESSION);
if (nbr == NULL && !tcp->wbuf.wbuf.queued) {
/*
* We are done sending the notification message, now we can
* close the socket.
*/
tcp_close(tcp);
return (0);
}
evbuf_event_add(&tcp->wbuf);
return (0);
}
void
session_shutdown(struct nbr *nbr, uint32_t status, uint32_t msg_id,
uint32_t msg_type)
{
switch (nbr->state) {
case NBR_STA_PRESENT:
if (nbr_pending_connect(nbr))
THREAD_WRITE_OFF(nbr->ev_connect);
break;
case NBR_STA_INITIAL:
case NBR_STA_OPENREC:
case NBR_STA_OPENSENT:
case NBR_STA_OPER:
log_debug("%s: lsr-id %s", __func__, inet_ntoa(nbr->id));
send_notification(nbr->tcp, status, msg_id, msg_type);
nbr_fsm(nbr, NBR_EVT_CLOSE_SESSION);
break;
default:
fatalx("session_shutdown: unknown neighbor state");
}
}
void
session_close(struct nbr *nbr)
{
log_debug("%s: closing session with lsr-id %s", __func__,
inet_ntoa(nbr->id));
tcp_close(nbr->tcp);
nbr_stop_ktimer(nbr);
nbr_stop_ktimeout(nbr);
nbr_stop_itimeout(nbr);
}
static ssize_t
session_get_pdu(struct ibuf_read *r, char **b)
{
struct ldp_hdr l;
size_t av, dlen, left;
av = r->wpos;
if (av < sizeof(l))
return (0);
memcpy(&l, r->buf, sizeof(l));
dlen = ntohs(l.length) + LDP_HDR_DEAD_LEN;
if (dlen > av)
return (0);
if ((*b = malloc(dlen)) == NULL)
return (-1);
memcpy(*b, r->buf, dlen);
if (dlen < av) {
left = av - dlen;
memmove(r->buf, r->buf + dlen, left);
r->wpos = left;
} else
r->wpos = 0;
return (dlen);
}
struct tcp_conn *
tcp_new(int fd, struct nbr *nbr)
{
struct tcp_conn *tcp;
struct sockaddr_storage ss;
socklen_t len = sizeof(ss);
if ((tcp = calloc(1, sizeof(*tcp))) == NULL)
fatal(__func__);
tcp->fd = fd;
evbuf_init(&tcp->wbuf, tcp->fd, session_write, tcp);
if (nbr) {
if ((tcp->rbuf = calloc(1, sizeof(struct ibuf_read))) == NULL)
fatal(__func__);
tcp->rev = thread_add_read(master, session_read, nbr, tcp->fd);
tcp->nbr = nbr;
}
if (getsockname(fd, (struct sockaddr *)&ss, &len) != 0)
log_warn("%s: getsockname", __func__);
else
sa2addr((struct sockaddr *)&ss, NULL, NULL, &tcp->lport);
if (getpeername(fd, (struct sockaddr *)&ss, &len) != 0)
log_warn("%s: getpeername", __func__);
else
sa2addr((struct sockaddr *)&ss, NULL, NULL, &tcp->rport);
return (tcp);
}
static void
tcp_close(struct tcp_conn *tcp)
{
/* try to flush write buffer */
msgbuf_write(&tcp->wbuf.wbuf);
evbuf_clear(&tcp->wbuf);
if (tcp->nbr) {
THREAD_READ_OFF(tcp->rev);
free(tcp->rbuf);
tcp->nbr->tcp = NULL;
}
close(tcp->fd);
accept_unpause();
free(tcp);
}
static struct pending_conn *
pending_conn_new(int fd, int af, union ldpd_addr *addr)
{
struct pending_conn *pconn;
if ((pconn = calloc(1, sizeof(*pconn))) == NULL)
fatal(__func__);
pconn->fd = fd;
pconn->af = af;
pconn->addr = *addr;
TAILQ_INSERT_TAIL(&global.pending_conns, pconn, entry);
pconn->ev_timeout = thread_add_timer(master, pending_conn_timeout,
pconn, PENDING_CONN_TIMEOUT);
return (pconn);
}
void
pending_conn_del(struct pending_conn *pconn)
{
THREAD_TIMER_OFF(pconn->ev_timeout);
TAILQ_REMOVE(&global.pending_conns, pconn, entry);
free(pconn);
}
struct pending_conn *
pending_conn_find(int af, union ldpd_addr *addr)
{
struct pending_conn *pconn;
TAILQ_FOREACH(pconn, &global.pending_conns, entry)
if (af == pconn->af &&
ldp_addrcmp(af, addr, &pconn->addr) == 0)
return (pconn);
return (NULL);
}
static int
pending_conn_timeout(struct thread *thread)
{
struct pending_conn *pconn = THREAD_ARG(thread);
struct tcp_conn *tcp;
pconn->ev_timeout = NULL;
log_debug("%s: no adjacency with remote end: %s", __func__,
log_addr(pconn->af, &pconn->addr));
/*
* Create a write buffer detached from any neighbor to send a
* notification message reliably.
*/
tcp = tcp_new(pconn->fd, NULL);
send_notification(tcp, S_NO_HELLO, 0, 0);
msgbuf_write(&tcp->wbuf.wbuf);
pending_conn_del(pconn);
return (0);
}
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