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MINOR: set IP_FREEBIND on IPv6 sockets in transparent mode

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Lets set IP_FREEBIND on IPv6 sockets as well, this works since Linux 3.3
and doesn't require CAP_NET_ADMIN privileges (IPV6_TRANSPARENT does).

This allows unprivileged users to bind to non-local IPv6 addresses, which
can be useful when setting up the listening sockets or when connecting
to backend servers with a specific, non-local source IPv6 address (at that
point we usually dropped root privileges already).
This commit is contained in:
Lukas Tribus 2014-03-03 21:10:51 +01:00 committed by Willy Tarreau
parent 583021306b
commit 7640e72a31
1 changed files with 6 additions and 0 deletions
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6
src/proto_tcp.c
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@ -160,6 +160,9 @@ int tcp_bind_socket(int fd, int flags, struct sockaddr_storage *local, struct so
#if defined(IPV6_TRANSPARENT)
|| (setsockopt(fd, SOL_IPV6, IPV6_TRANSPARENT, &one, sizeof(one)) == 0)
#endif
#if defined(IP_FREEBIND)
|| (setsockopt(fd, SOL_IP, IP_FREEBIND, &one, sizeof(one)) == 0)
#endif
#if defined(IPV6_BINDANY)
|| (setsockopt(fd, IPPROTO_IPV6, IPV6_BINDANY, &one, sizeof(one)) == 0)
#endif
@ -787,6 +790,9 @@ int tcp_bind_listener(struct listener *listener, char *errmsg, int errlen)
#if defined(IPV6_TRANSPARENT)
&& (setsockopt(fd, SOL_IPV6, IPV6_TRANSPARENT, &one, sizeof(one)) == -1)
#endif
#if defined(IP_FREEBIND)
&& (setsockopt(fd, SOL_IP, IP_FREEBIND, &one, sizeof(one)) == -1)
#endif
#if defined(IPV6_BINDANY)
&& (setsockopt(fd, IPPROTO_IPV6, IPV6_BINDANY, &one, sizeof(one)) == -1)
#endif