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authorOndrej Zajicek (work) <santiago@crfreenet.org>2018-07-28 16:54:06 +0200
committerOndrej Zajicek (work) <santiago@crfreenet.org>2018-07-28 19:30:56 +0200
commit6be71641ef3baa8658d031f3624f4481b493bdaf (patch)
tree4d2064ba61b1460bad4aa47a820e99ced14976b9 /sysdep/unix
parent3140c8b2ca48263da1a1f12b478031dc4b572db7 (diff)
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).
Diffstat (limited to 'sysdep/unix')
-rw-r--r--sysdep/unix/io.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/sysdep/unix/io.c b/sysdep/unix/io.c
index 53a37a50..786c6a56 100644
--- a/sysdep/unix/io.c
+++ b/sysdep/unix/io.c
@@ -1574,6 +1574,7 @@ sk_sendmsg(sock *s)
struct iovec iov = {s->tbuf, s->tpos - s->tbuf};
byte cmsg_buf[CMSG_TX_SPACE];
sockaddr dst;
+ int flags = 0;
sockaddr_fill(&dst, s->af, s->daddr, s->iface, s->dport);
@@ -1584,6 +1585,11 @@ sk_sendmsg(sock *s)
.msg_iovlen = 1
};
+#ifdef CONFIG_DONTROUTE_UNICAST
+ if (ipa_is_ip4(s->daddr) && ip4_is_unicast(ipa_to_ip4(s->daddr)))
+ flags = MSG_DONTROUTE;
+#endif
+
#ifdef CONFIG_USE_HDRINCL
byte hdr[20];
struct iovec iov2[2] = { {hdr, 20}, iov };
@@ -1599,7 +1605,7 @@ sk_sendmsg(sock *s)
if (s->flags & SKF_PKTINFO)
sk_prepare_cmsgs(s, &msg, cmsg_buf, sizeof(cmsg_buf));
- return sendmsg(s->fd, &msg, 0);
+ return sendmsg(s->fd, &msg, flags);
}
static inline int