diff options
| author |   mpi <mpi@openbsd.org> | 2015-08-31 07:27:48 +0000 |
|---|---|---|
| committer | mpi <mpi@openbsd.org> | 2015-08-31 07:27:48 +0000 |
| commit | c91534fbb13a08e9245113a51a67a41617ac513e (patch) | |
| tree | b744a01e052c23c55ffbb6167c49ad4242afe88e /sys | |
| parent | `encif' should only be used under #ifdef NPF. (diff) | |
| download | wireguard-openbsd-c91534fbb13a08e9245113a51a67a41617ac513e.tar.xz wireguard-openbsd-c91534fbb13a08e9245113a51a67a41617ac513e.zip | |
Compute the checksum before looping back the copy of a multicast packet.
Found while comparing IPv4 and IPv6 versions.
ok naddy@
Diffstat (limited to 'sys')
| -rw-r--r-- | sys/netinet6/ip6_output.c | 13 |
1 files changed, 9 insertions, 4 deletions
diff --git a/sys/netinet6/ip6_output.c b/sys/netinet6/ip6_output.c index 44ab529d5bd..28b797d2600 100644 --- a/sys/netinet6/ip6_output.c +++ b/sys/netinet6/ip6_output.c @@ -1,4 +1,4 @@ -/* $OpenBSD: ip6_output.c,v 1.178 2015/08/31 07:17:12 mpi Exp $ */ +/* $OpenBSD: ip6_output.c,v 1.179 2015/08/31 07:27:48 mpi Exp $ */ /* $KAME: ip6_output.c,v 1.172 2001/03/25 09:55:56 itojun Exp $ */ /* @@ -597,6 +597,7 @@ reroute: error = ENETUNREACH; goto bad; } + IN6_LOOKUP_MULTI(ip6->ip6_dst, ifp, in6m); if (in6m != NULL && (im6o == NULL || im6o->im6o_loop)) { @@ -604,9 +605,14 @@ reroute: * If we belong to the destination multicast group * on the outgoing interface, and the caller did not * forbid loopback, loop back a copy. + * Can't defer TCP/UDP checksumming, do the + * computation now. */ + in6_proto_cksum_out(m, NULL); ip6_mloopback(ifp, m, dst); - } else { + } +#ifdef MROUTING + else { /* * If we are acting as a multicast router, perform * multicast forwarding as if the packet had just @@ -619,7 +625,6 @@ reroute: * above, will be forwarded by the ip6_input() routine, * if necessary. */ -#ifdef MROUTING if (ip6_mforwarding && ip6_mrouter && (flags & IPV6_FORWARDING) == 0) { if (ip6_mforward(ip6, ifp, m) != 0) { @@ -627,8 +632,8 @@ reroute: goto done; } } -#endif } +#endif /* * Multicasts with a hoplimit of zero may be looped back, * above, but must not be transmitted on a network. |