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BUG/MINOR: tcp: fix silent-drop workaround for IPv6

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As reported in github issue #1203 the TTL-based workaround that is used
when permissions are insufficient for the TCP_REPAIR trick does not work
for IPv6 because we're using only SOL_IP with IP_TTL. In IPv6 we have to
use SOL_IPV6 and IPV6_UNICAST_HOPS. Let's pick the right one based on the
source address's family.

This may be backported to all versions.
This commit is contained in:
Willy Tarreau 2021-03-30 17:23:50 +02:00
parent b48e7c0016
commit ab79ee8b11
1 changed files with 6 additions and 1 deletions
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7
src/tcp_act.c
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@ -207,7 +207,12 @@ static enum act_return tcp_exec_action_silent_drop(struct act_rule *rule, struct
* network and has no effect on local net.
*/
#ifdef IP_TTL
setsockopt(conn->handle.fd, SOL_IP, IP_TTL, &one, sizeof(one));
if (conn->src && conn->src->ss_family == AF_INET)
setsockopt(conn->handle.fd, SOL_IP, IP_TTL, &one, sizeof(one));
#endif
#ifdef IPV6_UNICAST_HOPS
if (conn->src && conn->src->ss_family == AF_INET6)
setsockopt(conn->handle.fd, SOL_IPV6, IPV6_UNICAST_HOPS, &one, sizeof(one));
#endif
out:
/* kill the stream if any */