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!
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1 changed files with 3 additions and 1 deletions
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@ -1566,7 +1566,9 @@ sk_sendmsg(sock *s)
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};
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#ifdef CONFIG_DONTROUTE_UNICAST
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if (ipa_is_ip4(s->daddr) && ip4_is_unicast(ipa_to_ip4(s->daddr)))
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/* FreeBSD silently changes TTL to 1 when MSG_DONTROUTE is used, therefore we
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cannot use it for other cases (e.g. when TTL security is used). */
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if (ipa_is_ip4(s->daddr) && ip4_is_unicast(ipa_to_ip4(s->daddr)) && (s->ttl == 1))
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flags = MSG_DONTROUTE;
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#endif
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