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BSD: Use MSG_DONTROUTE for unicast packets on FreeBSD
BSD systems cannot use SO_DONTROUTE, because it does not work properly with multicast packets (perhaps it tries to find iface based on multicast group address). But we can use MSG_DONTROUTE sendmsg() flag for unicast packets. Works on FreeBSD, is ignored on OpenBSD and is broken on NetBSD (i guess due to integrated routing table and ARP table).
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3
lib/ip.h
3
lib/ip.h
@ -241,6 +241,9 @@ static inline int ip6_is_v4mapped(ip6_addr a)
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#define ipa_classify(x) ip6_classify(&(x))
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#define ipa_is_link_local(x) ip6_is_link_local(x)
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static inline int ip4_is_unicast(ip4_addr a)
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{ return _I(a) < 0xe0000000; }
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/* XXXX remove */
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static inline int ipa_classify_net(ip_addr a)
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{ return ipa_zero2(a) ? (IADDR_HOST | SCOPE_UNIVERSE) : ipa_classify(a); }
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@ -12,6 +12,11 @@
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#include <sys/param.h>
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#ifdef __FreeBSD__
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/* Should be defined in sysdep/cf/bsd.h, but it is flavor-specific */
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#define CONFIG_DONTROUTE_UNICAST
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#endif
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#ifdef __NetBSD__
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#ifndef IP_RECVTTL
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@ -11,6 +11,7 @@ CONFIG_MC_PROPER_SRC Multicast packets have source address according to socket s
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CONFIG_SKIP_MC_BIND Don't call bind on multicast socket (def for *BSD)
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CONFIG_NO_IFACE_BIND Bind to iface is not available, use workarounds (def for *BSD)
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CONFIG_UNIX_DONTROUTE Use setsockopts DONTROUTE (undef for *BSD)
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CONFIG_DONTROUTE_UNICAST Use MSG_DONTROUTE flag for unicast packets (def for FreeBSD)
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CONFIG_USE_HDRINCL Use IP_HDRINCL instead of control messages for source address on raw IP sockets.
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CONFIG_RESTRICTED_PRIVILEGES Implements restricted privileges using drop_uid()
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@ -1541,6 +1541,7 @@ sk_sendmsg(sock *s)
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struct iovec iov = {s->tbuf, s->tpos - s->tbuf};
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byte cmsg_buf[CMSG_TX_SPACE];
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sockaddr dst;
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int flags = 0;
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sockaddr_fill(&dst, s->af, s->daddr, s->iface, s->dport);
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@ -1551,6 +1552,11 @@ sk_sendmsg(sock *s)
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.msg_iovlen = 1
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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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flags = MSG_DONTROUTE;
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#endif
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#ifdef CONFIG_USE_HDRINCL
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byte hdr[20];
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struct iovec iov2[2] = { {hdr, 20}, iov };
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@ -1566,7 +1572,7 @@ sk_sendmsg(sock *s)
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if (s->flags & SKF_PKTINFO)
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sk_prepare_cmsgs(s, &msg, cmsg_buf, sizeof(cmsg_buf));
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return sendmsg(s->fd, &msg, 0);
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return sendmsg(s->fd, &msg, flags);
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}
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static inline int
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