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IO: Support nonlocal bind in socket interface

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Add option to socket interface for nonlocal binding, i.e. binding to an
IP address that is not present on interfaces. This behaviour is enabled
when SKF_FREEBIND socket flag is set. For Linux systems, it is
implemented by IP_FREEBIND socket flag.

Minor changes done by commiter.
This commit is contained in:
Alexander Zubkov 2022-01-08 18:31:56 +01:00 committed by Ondrej Zajicek (work)
parent bcb25084d3
commit 87a02489f3
4 changed files with 30 additions and 0 deletions
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1
lib/socket.h
View File

@ -123,6 +123,7 @@ extern int sk_priority_control; /* Suggested priority for control traffic, shou
#define SKF_TTL_RX 0x08 /* Report TTL / Hop Limit for RX packets */
#define SKF_BIND 0x10 /* Bind datagram socket to given source address */
#define SKF_HIGH_PORT 0x20 /* Choose port from high range if possible */
#define SKF_FREEBIND 0x40 /* Allow socket to bind to a nonlocal address */
#define SKF_THREAD 0x100 /* Socked used in thread, Do not add to main loop */
#define SKF_TRUNCATED 0x200 /* Received packet was truncated, set by IO layer */

6
sysdep/bsd/sysio.h
View File

@ -271,3 +271,9 @@ sk_set_priority(sock *s, int prio UNUSED)
{
ERR_MSG("Socket priority not supported");
}
static inline int
sk_set_freebind(sock *s)
{
ERR_MSG("Freebind is not supported");
}

19
sysdep/linux/sysio.h
View File

@ -10,6 +10,10 @@
#define IPV6_MINHOPCOUNT 73
#endif
#ifndef IPV6_FREEBIND
#define IPV6_FREEBIND 78
#endif
#ifndef TCP_MD5SIG_EXT
#define TCP_MD5SIG_EXT 32
#endif
@ -266,3 +270,18 @@ sk_set_priority(sock *s, int prio)
return 0;
}
static inline int
sk_set_freebind(sock *s)
{
int y = 1;
if (sk_is_ipv4(s))
if (setsockopt(s->fd, SOL_IP, IP_FREEBIND, &y, sizeof(y)) < 0)
ERR("IP_FREEBIND");
if (sk_is_ipv6(s))
if (setsockopt(s->fd, SOL_IPV6, IPV6_FREEBIND, &y, sizeof(y)) < 0)
ERR("IPV6_FREEBIND");
return 0;
}

4
sysdep/unix/io.c
View File

@ -1436,6 +1436,10 @@ sk_open(sock *s)
if (sk_set_high_port(s) < 0)
log(L_WARN "Socket error: %s%#m", s->err);
if (s->flags & SKF_FREEBIND)
if (sk_set_freebind(s) < 0)
log(L_WARN "Socket error: %s%#m", s->err);
sockaddr_fill(&sa, s->af, bind_addr, s->iface, bind_port);
if (bind(fd, &sa.sa, SA_LEN(sa)) < 0)
ERR2("bind");