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|
/* $OpenBSD$ */
/*
* Copyright (c) 2016 Renato Westphal <renato@openbsd.org>
* Copyright (c) 2009 Michele Marchetto <michele@openbsd.org>
* Copyright (c) 2005 Claudio Jeker <claudio@openbsd.org>
* 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 <zebra.h>
#include "ldpd.h"
#include "ldpe.h"
#include "log.h"
#include "lib/log.h"
#include "privs.h"
#include "sockopt.h"
extern struct zebra_privs_t ldpd_privs;
extern struct zebra_privs_t ldpe_privs;
int
ldp_create_socket(int af, enum socket_type type)
{
int fd, domain, proto;
union ldpd_addr addr;
union sockunion local_su;
#ifdef __OpenBSD__
int opt;
#endif
/* create socket */
switch (type) {
case LDP_SOCKET_DISC:
case LDP_SOCKET_EDISC:
domain = SOCK_DGRAM;
proto = IPPROTO_UDP;
break;
case LDP_SOCKET_SESSION:
domain = SOCK_STREAM;
proto = IPPROTO_TCP;
break;
default:
fatalx("ldp_create_socket: unknown socket type");
}
fd = socket(af, domain, proto);
if (fd == -1) {
log_warn("%s: error creating socket", __func__);
return (-1);
}
sock_set_nonblock(fd);
sockopt_v6only(af, fd);
/* bind to a local address/port */
switch (type) {
case LDP_SOCKET_DISC:
/* listen on all addresses */
memset(&addr, 0, sizeof(addr));
addr2sa(af, &addr, LDP_PORT, &local_su);
break;
case LDP_SOCKET_EDISC:
case LDP_SOCKET_SESSION:
addr = (ldp_af_conf_get(ldpd_conf, af))->trans_addr;
addr2sa(af, &addr, LDP_PORT, &local_su);
/* ignore any possible error */
sock_set_bindany(fd, 1);
break;
}
frr_elevate_privs(&ldpd_privs) {
if (sock_set_reuse(fd, 1) == -1) {
close(fd);
return (-1);
}
if (bind(fd, &local_su.sa, sockaddr_len(&local_su.sa)) == -1) {
log_warnx("%s: error binding socket: %s", __func__,
safe_strerror(errno));
close(fd);
return (-1);
}
}
/* set options */
switch (af) {
case AF_INET:
if (sock_set_ipv4_tos(fd, IPTOS_PREC_INTERNETCONTROL) == -1) {
close(fd);
return (-1);
}
if (type == LDP_SOCKET_DISC) {
if (sock_set_ipv4_mcast_ttl(fd,
IP_DEFAULT_MULTICAST_TTL) == -1) {
close(fd);
return (-1);
}
if (sock_set_ipv4_mcast_loop(fd) == -1) {
close(fd);
return (-1);
}
}
if (type == LDP_SOCKET_DISC || type == LDP_SOCKET_EDISC) {
if (sock_set_ipv4_recvif(fd, 1) == -1) {
close(fd);
return (-1);
}
#ifndef MSG_MCAST
#if defined(HAVE_IP_PKTINFO)
if (sock_set_ipv4_pktinfo(fd, 1) == -1) {
close(fd);
return (-1);
}
#elif defined(HAVE_IP_RECVDSTADDR)
if (sock_set_ipv4_recvdstaddr(fd, 1) == -1) {
close(fd);
return (-1);
}
#else
#error "Unsupported socket API"
#endif
#endif /* MSG_MCAST */
}
if (type == LDP_SOCKET_SESSION) {
if (sock_set_ipv4_ucast_ttl(fd, 255) == -1) {
close(fd);
return (-1);
}
}
break;
case AF_INET6:
if (sock_set_ipv6_dscp(fd, IPTOS_PREC_INTERNETCONTROL) == -1) {
close(fd);
return (-1);
}
if (type == LDP_SOCKET_DISC) {
if (sock_set_ipv6_mcast_loop(fd) == -1) {
close(fd);
return (-1);
}
if (sock_set_ipv6_mcast_hops(fd, 255) == -1) {
close(fd);
return (-1);
}
if (!(ldpd_conf->ipv6.flags & F_LDPD_AF_NO_GTSM)) {
/* ignore any possible error */
sock_set_ipv6_minhopcount(fd, 255);
}
}
if (type == LDP_SOCKET_DISC || type == LDP_SOCKET_EDISC) {
if (sock_set_ipv6_pktinfo(fd, 1) == -1) {
close(fd);
return (-1);
}
}
if (type == LDP_SOCKET_SESSION) {
if (sock_set_ipv6_ucast_hops(fd, 255) == -1) {
close(fd);
return (-1);
}
}
break;
}
switch (type) {
case LDP_SOCKET_DISC:
case LDP_SOCKET_EDISC:
sock_set_recvbuf(fd);
break;
case LDP_SOCKET_SESSION:
if (listen(fd, LDP_BACKLOG) == -1)
log_warn("%s: error listening on socket", __func__);
#ifdef __OpenBSD__
opt = 1;
if (setsockopt(fd, IPPROTO_TCP, TCP_MD5SIG, &opt,
sizeof(opt)) == -1) {
if (errno == ENOPROTOOPT) { /* system w/o md5sig */
log_warnx("md5sig not available, disabling");
sysdep.no_md5sig = 1;
} else {
close(fd);
return (-1);
}
}
#endif
break;
}
return (fd);
}
void
sock_set_nonblock(int fd)
{
int flags;
if ((flags = fcntl(fd, F_GETFL, 0)) == -1)
fatal("fcntl F_GETFL");
flags |= O_NONBLOCK;
if ((flags = fcntl(fd, F_SETFL, flags)) == -1)
fatal("fcntl F_SETFL");
}
void
sock_set_cloexec(int fd)
{
int flags;
if ((flags = fcntl(fd, F_GETFD, 0)) == -1)
fatal("fcntl F_GETFD");
flags |= FD_CLOEXEC;
if ((flags = fcntl(fd, F_SETFD, flags)) == -1)
fatal("fcntl F_SETFD");
}
void
sock_set_recvbuf(int fd)
{
int bsize;
bsize = 65535;
while (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &bsize,
sizeof(bsize)) == -1)
bsize /= 2;
}
int
sock_set_reuse(int fd, int enable)
{
if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &enable,
sizeof(int)) < 0) {
log_warn("%s: error setting SO_REUSEADDR", __func__);
return (-1);
}
return (0);
}
int
sock_set_bindany(int fd, int enable)
{
#ifdef HAVE_SO_BINDANY
frr_elevate_privs(&ldpd_privs) {
if (setsockopt(fd, SOL_SOCKET, SO_BINDANY, &enable,
sizeof(int)) < 0) {
log_warn("%s: error setting SO_BINDANY", __func__);
return (-1);
}
}
return (0);
#elif defined(HAVE_IP_FREEBIND)
if (setsockopt(fd, IPPROTO_IP, IP_FREEBIND, &enable, sizeof(int)) < 0) {
log_warn("%s: error setting IP_FREEBIND", __func__);
return (-1);
}
return (0);
#elif defined(IP_BINDANY)
frr_elevate_privs(&ldpd_privs) {
if (setsockopt(fd, IPPROTO_IP, IP_BINDANY, &enable, sizeof(int))
< 0) {
log_warn("%s: error setting IP_BINDANY", __func__);
return (-1);
}
}
return (0);
#else
log_warnx(
"%s: missing SO_BINDANY, IP_FREEBIND and IP_BINDANY, unable to bind to a nonlocal IP address",
__func__);
return (-1);
#endif /* HAVE_SO_BINDANY */
}
#ifndef __OpenBSD__
/*
* Set MD5 key for the socket, for the given peer address. If the password
* is NULL or zero-length, the option will be disabled.
*/
int
sock_set_md5sig(int fd, int af, union ldpd_addr *addr, const char *password)
{
int ret = -1;
int save_errno = ENOSYS;
#if HAVE_DECL_TCP_MD5SIG
union sockunion su;
#endif
if (fd == -1)
return (0);
#if HAVE_DECL_TCP_MD5SIG
addr2sa(af, addr, 0, &su);
frr_elevate_privs(&ldpe_privs) {
ret = sockopt_tcp_signature(fd, &su, password);
save_errno = errno;
}
#endif /* HAVE_TCP_MD5SIG */
if (ret < 0)
log_warnx("%s: can't set TCP_MD5SIG option on fd %d: %s",
__func__, fd, safe_strerror(save_errno));
return (ret);
}
#endif
int
sock_set_ipv4_tos(int fd, int tos)
{
if (setsockopt(fd, IPPROTO_IP, IP_TOS, (int *)&tos, sizeof(tos)) < 0) {
log_warn("%s: error setting IP_TOS to 0x%x", __func__, tos);
return (-1);
}
return (0);
}
int
sock_set_ipv4_recvif(int fd, int enable)
{
return (setsockopt_ifindex(AF_INET, fd, enable));
}
int
sock_set_ipv4_minttl(int fd, int ttl)
{
return (sockopt_minttl(AF_INET, fd, ttl));
}
int
sock_set_ipv4_ucast_ttl(int fd, int ttl)
{
if (setsockopt(fd, IPPROTO_IP, IP_TTL, &ttl, sizeof(ttl)) < 0) {
log_warn("%s: error setting IP_TTL", __func__);
return (-1);
}
return (0);
}
int
sock_set_ipv4_mcast_ttl(int fd, uint8_t ttl)
{
if (setsockopt(fd, IPPROTO_IP, IP_MULTICAST_TTL,
(char *)&ttl, sizeof(ttl)) < 0) {
log_warn("%s: error setting IP_MULTICAST_TTL to %d",
__func__, ttl);
return (-1);
}
return (0);
}
#ifndef MSG_MCAST
#if defined(HAVE_IP_PKTINFO)
int
sock_set_ipv4_pktinfo(int fd, int enable)
{
if (setsockopt(fd, IPPROTO_IP, IP_PKTINFO, &enable,
sizeof(enable)) < 0) {
log_warn("%s: error setting IP_PKTINFO", __func__);
return (-1);
}
return (0);
}
#elif defined(HAVE_IP_RECVDSTADDR)
int
sock_set_ipv4_recvdstaddr(int fd, int enable)
{
if (setsockopt(fd, IPPROTO_IP, IP_RECVDSTADDR, &enable,
sizeof(enable)) < 0) {
log_warn("%s: error setting IP_RECVDSTADDR", __func__);
return (-1);
}
return (0);
}
#else
#error "Unsupported socket API"
#endif
#endif /* MSG_MCAST */
int
sock_set_ipv4_mcast(struct iface *iface)
{
struct in_addr if_addr;
if_addr.s_addr = if_get_ipv4_addr(iface);
if (setsockopt_ipv4_multicast_if(global.ipv4.ldp_disc_socket,
if_addr, iface->ifindex) < 0) {
log_warn("%s: error setting IP_MULTICAST_IF, interface %s",
__func__, iface->name);
return (-1);
}
return (0);
}
int
sock_set_ipv4_mcast_loop(int fd)
{
return (setsockopt_ipv4_multicast_loop(fd, 0));
}
int
sock_set_ipv6_dscp(int fd, int dscp)
{
if (setsockopt(fd, IPPROTO_IPV6, IPV6_TCLASS, &dscp,
sizeof(dscp)) < 0) {
log_warn("%s: error setting IPV6_TCLASS", __func__);
return (-1);
}
return (0);
}
int
sock_set_ipv6_pktinfo(int fd, int enable)
{
if (setsockopt(fd, IPPROTO_IPV6, IPV6_RECVPKTINFO, &enable,
sizeof(enable)) < 0) {
log_warn("%s: error setting IPV6_RECVPKTINFO", __func__);
return (-1);
}
return (0);
}
int
sock_set_ipv6_minhopcount(int fd, int hoplimit)
{
return (sockopt_minttl(AF_INET6, fd, hoplimit));
}
int
sock_set_ipv6_ucast_hops(int fd, int hoplimit)
{
if (setsockopt(fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS,
&hoplimit, sizeof(hoplimit)) < 0) {
log_warn("%s: error setting IPV6_UNICAST_HOPS", __func__);
return (-1);
}
return (0);
}
int
sock_set_ipv6_mcast_hops(int fd, int hoplimit)
{
if (setsockopt(fd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS,
&hoplimit, sizeof(hoplimit)) < 0) {
log_warn("%s: error setting IPV6_MULTICAST_HOPS", __func__);
return (-1);
}
return (0);
}
int
sock_set_ipv6_mcast(struct iface *iface)
{
if (setsockopt(global.ipv6.ldp_disc_socket, IPPROTO_IPV6,
IPV6_MULTICAST_IF, &iface->ifindex, sizeof(iface->ifindex)) < 0) {
log_warn("%s: error setting IPV6_MULTICAST_IF, interface %s",
__func__, iface->name);
return (-1);
}
return (0);
}
int
sock_set_ipv6_mcast_loop(int fd)
{
unsigned int loop = 0;
if (setsockopt(fd, IPPROTO_IPV6, IPV6_MULTICAST_LOOP,
&loop, sizeof(loop)) < 0) {
log_warn("%s: error setting IPV6_MULTICAST_LOOP", __func__);
return (-1);
}
return (0);
}
|