diff options
| author | Ondrej Zajicek (work) <santiago@crfreenet.org> | 2018-12-19 18:10:39 +0100 |
|---|---|---|
| committer | Ondrej Zajicek (work) <santiago@crfreenet.org> | 2018-12-19 18:10:39 +0100 |
| commit | 04edf8f2f251f0c2a133843b898cad84f9312880 (patch) | |
| tree | f2324b75e30cb31c3943cae1a7c21a6c72413be8 | |
| parent | c0ed32ee28cbeabf8d36f59765fe593baf39c788 (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 f7a9e29f..a90ddffd 100644 --- a/sysdep/unix/io.c +++ b/sysdep/unix/io.c @@ -1614,7 +1614,9 @@ 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 |