diff options
| author | Ondrej Zajicek (work) <santiago@crfreenet.org> | 2018-12-18 19:16:23 +0100 |
|---|---|---|
| committer | Ondrej Zajicek (work) <santiago@crfreenet.org> | 2018-12-18 19:17:17 +0100 |
| commit | c2d29dd197cbff6c143a570576c81bee20fc06eb (patch) | |
| tree | e1b775bc1b5ebb8e84da3507a75bd7174b8a4ff7 | |
| parent | 82b742533bdbf977ec95997fc0011a47a672bcc8 (diff) | |
IO: Workaround for broken FreeBSD behavior
FreeBSD silently changes TTL to 1 when MSG_DONTROUTE is used, even when
it is explicitly set to another value. That breaks TTL security sockets,
including BFD which always uses TTL 255. Bad FreeBSD!
| -rw-r--r-- | sysdep/unix/io.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/sysdep/unix/io.c b/sysdep/unix/io.c index 8c9052a3..a511e88e 100644 --- a/sysdep/unix/io.c +++ b/sysdep/unix/io.c @@ -1566,7 +1566,9 @@ sk_sendmsg(sock *s) }; #ifdef CONFIG_DONTROUTE_UNICAST - if (ipa_is_ip4(s->daddr) && ip4_is_unicast(ipa_to_ip4(s->daddr))) + /* FreeBSD silently changes TTL to 1 when MSG_DONTROUTE is used, therefore we + cannot use it for other cases (e.g. when TTL security is used). */ + if (ipa_is_ip4(s->daddr) && ip4_is_unicast(ipa_to_ip4(s->daddr)) && (s->ttl == 1)) flags = MSG_DONTROUTE; #endif |