1 // SPDX-License-Identifier: ISC
5 * Copyright (c) 2016 Renato Westphal <renato@openbsd.org>
6 * Copyright (c) 2009 Michele Marchetto <michele@openbsd.org>
7 * Copyright (c) 2005 Claudio Jeker <claudio@openbsd.org>
8 * Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
21 extern struct zebra_privs_t ldpd_privs
;
22 extern struct zebra_privs_t ldpe_privs
;
25 ldp_create_socket(int af
, enum socket_type type
)
27 int fd
, domain
, proto
;
29 union sockunion local_su
;
37 case LDP_SOCKET_EDISC
:
41 case LDP_SOCKET_SESSION
:
46 fatalx("ldp_create_socket: unknown socket type");
48 fd
= socket(af
, domain
, proto
);
50 log_warn("%s: error creating socket", __func__
);
53 sock_set_nonblock(fd
);
54 sockopt_v6only(af
, fd
);
56 /* bind to a local address/port */
59 /* listen on all addresses */
60 memset(&addr
, 0, sizeof(addr
));
61 addr2sa(af
, &addr
, LDP_PORT
, &local_su
);
63 case LDP_SOCKET_EDISC
:
64 case LDP_SOCKET_SESSION
:
65 addr
= (ldp_af_conf_get(ldpd_conf
, af
))->trans_addr
;
66 addr2sa(af
, &addr
, LDP_PORT
, &local_su
);
67 /* ignore any possible error */
68 sock_set_bindany(fd
, 1);
71 frr_with_privs(&ldpd_privs
) {
72 if (sock_set_reuse(fd
, 1) == -1) {
76 if (bind(fd
, &local_su
.sa
, sockaddr_len(&local_su
.sa
)) == -1) {
77 log_warnx("%s: error binding socket: %s", __func__
,
78 safe_strerror(errno
));
87 if (sock_set_ipv4_tos(fd
, IPTOS_PREC_INTERNETCONTROL
) == -1) {
91 if (type
== LDP_SOCKET_DISC
) {
92 if (sock_set_ipv4_mcast_ttl(fd
,
93 IP_DEFAULT_MULTICAST_TTL
) == -1) {
97 if (sock_set_ipv4_mcast_loop(fd
) == -1) {
102 if (type
== LDP_SOCKET_DISC
|| type
== LDP_SOCKET_EDISC
) {
103 if (sock_set_ipv4_recvif(fd
, 1) == -1) {
108 #if defined(HAVE_IP_PKTINFO)
109 if (sock_set_ipv4_pktinfo(fd
, 1) == -1) {
113 #elif defined(HAVE_IP_RECVDSTADDR)
114 if (sock_set_ipv4_recvdstaddr(fd
, 1) == -1) {
119 #error "Unsupported socket API"
121 #endif /* MSG_MCAST */
123 if (type
== LDP_SOCKET_SESSION
) {
124 if (sock_set_ipv4_ucast_ttl(fd
, 255) == -1) {
131 if (sock_set_ipv6_dscp(fd
, IPTOS_PREC_INTERNETCONTROL
) == -1) {
135 if (type
== LDP_SOCKET_DISC
) {
136 if (sock_set_ipv6_mcast_loop(fd
) == -1) {
140 if (sock_set_ipv6_mcast_hops(fd
, 255) == -1) {
144 if (!(ldpd_conf
->ipv6
.flags
& F_LDPD_AF_NO_GTSM
)) {
145 /* ignore any possible error */
146 sock_set_ipv6_minhopcount(fd
, 255);
149 if (type
== LDP_SOCKET_DISC
|| type
== LDP_SOCKET_EDISC
) {
150 if (sock_set_ipv6_pktinfo(fd
, 1) == -1) {
155 if (type
== LDP_SOCKET_SESSION
) {
156 if (sock_set_ipv6_ucast_hops(fd
, 255) == -1) {
164 case LDP_SOCKET_DISC
:
165 case LDP_SOCKET_EDISC
:
166 sock_set_recvbuf(fd
);
168 case LDP_SOCKET_SESSION
:
169 if (listen(fd
, LDP_BACKLOG
) == -1)
170 log_warn("%s: error listening on socket", __func__
);
174 if (setsockopt(fd
, IPPROTO_TCP
, TCP_MD5SIG
, &opt
,
175 sizeof(opt
)) == -1) {
176 if (errno
== ENOPROTOOPT
) { /* system w/o md5sig */
177 log_warnx("md5sig not available, disabling");
178 sysdep
.no_md5sig
= 1;
192 sock_set_nonblock(int fd
)
196 if ((flags
= fcntl(fd
, F_GETFL
, 0)) == -1)
197 fatal("fcntl F_GETFL");
201 if (fcntl(fd
, F_SETFL
, flags
) == -1)
202 fatal("fcntl F_SETFL");
206 sock_set_cloexec(int fd
)
210 if ((flags
= fcntl(fd
, F_GETFD
, 0)) == -1)
211 fatal("fcntl F_GETFD");
215 if (fcntl(fd
, F_SETFD
, flags
) == -1)
216 fatal("fcntl F_SETFD");
220 sock_set_recvbuf(int fd
)
225 while (setsockopt(fd
, SOL_SOCKET
, SO_RCVBUF
, &bsize
,
226 sizeof(bsize
)) == -1)
231 sock_set_reuse(int fd
, int enable
)
233 if (setsockopt(fd
, SOL_SOCKET
, SO_REUSEADDR
, &enable
,
235 log_warn("%s: error setting SO_REUSEADDR", __func__
);
243 sock_set_bindany(int fd
, int enable
)
245 #ifdef HAVE_SO_BINDANY
246 frr_with_privs(&ldpd_privs
) {
247 if (setsockopt(fd
, SOL_SOCKET
, SO_BINDANY
, &enable
,
249 log_warn("%s: error setting SO_BINDANY", __func__
);
254 #elif defined(HAVE_IP_FREEBIND)
255 if (setsockopt(fd
, IPPROTO_IP
, IP_FREEBIND
, &enable
, sizeof(int)) < 0) {
256 log_warn("%s: error setting IP_FREEBIND", __func__
);
260 #elif defined(IP_BINDANY)
261 frr_with_privs(&ldpd_privs
) {
262 if (setsockopt(fd
, IPPROTO_IP
, IP_BINDANY
, &enable
, sizeof(int))
264 log_warn("%s: error setting IP_BINDANY", __func__
);
271 "%s: missing SO_BINDANY, IP_FREEBIND and IP_BINDANY, unable to bind to a nonlocal IP address",
274 #endif /* HAVE_SO_BINDANY */
279 * Set MD5 key for the socket, for the given peer address. If the password
280 * is NULL or zero-length, the option will be disabled.
283 sock_set_md5sig(int fd
, int af
, union ldpd_addr
*addr
, const char *password
)
286 int save_errno
= ENOSYS
;
287 #if HAVE_DECL_TCP_MD5SIG
293 #if HAVE_DECL_TCP_MD5SIG
294 addr2sa(af
, addr
, 0, &su
);
296 frr_with_privs(&ldpe_privs
) {
297 ret
= sockopt_tcp_signature(fd
, &su
, password
);
300 #endif /* HAVE_TCP_MD5SIG */
302 log_warnx("%s: can't set TCP_MD5SIG option on fd %d: %s",
303 __func__
, fd
, safe_strerror(save_errno
));
310 sock_set_ipv4_tos(int fd
, int tos
)
312 if (setsockopt(fd
, IPPROTO_IP
, IP_TOS
, &tos
, sizeof(tos
)) < 0) {
313 log_warn("%s: error setting IP_TOS to 0x%x", __func__
, tos
);
321 sock_set_ipv4_recvif(int fd
, ifindex_t enable
)
323 return (setsockopt_ifindex(AF_INET
, fd
, enable
));
327 sock_set_ipv4_minttl(int fd
, int ttl
)
329 return (sockopt_minttl(AF_INET
, fd
, ttl
));
333 sock_set_ipv4_ucast_ttl(int fd
, int ttl
)
335 if (setsockopt(fd
, IPPROTO_IP
, IP_TTL
, &ttl
, sizeof(ttl
)) < 0) {
336 log_warn("%s: error setting IP_TTL", __func__
);
344 sock_set_ipv4_mcast_ttl(int fd
, uint8_t ttl
)
346 if (setsockopt(fd
, IPPROTO_IP
, IP_MULTICAST_TTL
,
347 (char *)&ttl
, sizeof(ttl
)) < 0) {
348 log_warn("%s: error setting IP_MULTICAST_TTL to %d",
357 #if defined(HAVE_IP_PKTINFO)
359 sock_set_ipv4_pktinfo(int fd
, int enable
)
361 if (setsockopt(fd
, IPPROTO_IP
, IP_PKTINFO
, &enable
,
362 sizeof(enable
)) < 0) {
363 log_warn("%s: error setting IP_PKTINFO", __func__
);
369 #elif defined(HAVE_IP_RECVDSTADDR)
371 sock_set_ipv4_recvdstaddr(int fd
, int enable
)
373 if (setsockopt(fd
, IPPROTO_IP
, IP_RECVDSTADDR
, &enable
,
374 sizeof(enable
)) < 0) {
375 log_warn("%s: error setting IP_RECVDSTADDR", __func__
);
382 #error "Unsupported socket API"
384 #endif /* MSG_MCAST */
387 sock_set_ipv4_mcast(struct iface
*iface
)
389 struct in_addr if_addr
;
391 if_addr
.s_addr
= if_get_ipv4_addr(iface
);
393 if (setsockopt_ipv4_multicast_if(global
.ipv4
.ldp_disc_socket
,
394 if_addr
, iface
->ifindex
) < 0) {
395 log_warn("%s: error setting IP_MULTICAST_IF, interface %s",
396 __func__
, iface
->name
);
404 sock_set_ipv4_mcast_loop(int fd
)
406 return (setsockopt_ipv4_multicast_loop(fd
, 0));
410 sock_set_ipv6_dscp(int fd
, int dscp
)
412 if (setsockopt(fd
, IPPROTO_IPV6
, IPV6_TCLASS
, &dscp
,
414 log_warn("%s: error setting IPV6_TCLASS", __func__
);
422 sock_set_ipv6_pktinfo(int fd
, int enable
)
424 if (setsockopt(fd
, IPPROTO_IPV6
, IPV6_RECVPKTINFO
, &enable
,
425 sizeof(enable
)) < 0) {
426 log_warn("%s: error setting IPV6_RECVPKTINFO", __func__
);
434 sock_set_ipv6_minhopcount(int fd
, int hoplimit
)
436 return (sockopt_minttl(AF_INET6
, fd
, hoplimit
));
440 sock_set_ipv6_ucast_hops(int fd
, int hoplimit
)
442 if (setsockopt(fd
, IPPROTO_IPV6
, IPV6_UNICAST_HOPS
,
443 &hoplimit
, sizeof(hoplimit
)) < 0) {
444 log_warn("%s: error setting IPV6_UNICAST_HOPS", __func__
);
452 sock_set_ipv6_mcast_hops(int fd
, int hoplimit
)
454 if (setsockopt(fd
, IPPROTO_IPV6
, IPV6_MULTICAST_HOPS
,
455 &hoplimit
, sizeof(hoplimit
)) < 0) {
456 log_warn("%s: error setting IPV6_MULTICAST_HOPS", __func__
);
464 sock_set_ipv6_mcast(struct iface
*iface
)
466 if (setsockopt(global
.ipv6
.ldp_disc_socket
, IPPROTO_IPV6
,
467 IPV6_MULTICAST_IF
, &iface
->ifindex
, sizeof(iface
->ifindex
)) < 0) {
468 log_warn("%s: error setting IPV6_MULTICAST_IF, interface %s",
469 __func__
, iface
->name
);
477 sock_set_ipv6_mcast_loop(int fd
)
479 unsigned int loop
= 0;
481 if (setsockopt(fd
, IPPROTO_IPV6
, IPV6_MULTICAST_LOOP
,
482 &loop
, sizeof(loop
)) < 0) {
483 log_warn("%s: error setting IPV6_MULTICAST_LOOP", __func__
);