sctp: Fix ECN markings for IPv6

Commit e9df2e8fd8fbc95c57dbd1d33dada66c4627b44c ("[IPV6]: Use
appropriate sock tclass setting for routing lookup.") also changed the
way that ECN capable transports mark this capability in IPv6.  As a
result, SCTP was not marking ECN capablity because the traffic class
was never set.  This patch brings back the markings for IPv6 traffic.

Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 6 insertions, 0 deletions

diff --git a/net/sctp/ipv6.c b/net/sctp/ipv6.c
index e4aac3266fcd..a2f4d4d51593 100644
--- a/net/sctp/ipv6.c
+++ b/net/sctp/ipv6.c
@@ -727,6 +727,11 @@ static void sctp_v6_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
         seq_printf(seq, NIP6_FMT " ", NIP6(addr->v6.sin6_addr));
 }
 
+static void sctp_v6_ecn_capable(struct sock *sk)
+{
+        inet6_sk(sk)->tclass |= INET_ECN_ECT_0;
+}
+
 /* Initialize a PF_INET6 socket msg_name. */
 static void sctp_inet6_msgname(char *msgname, int *addr_len)
 {
@@ -997,6 +1002,7 @@ static struct sctp_af sctp_af_inet6 = {
         .skb_iif           = sctp_v6_skb_iif,
         .is_ce             = sctp_v6_is_ce,
         .seq_dump_addr     = sctp_v6_seq_dump_addr,
+        .ecn_capable       = sctp_v6_ecn_capable,
         .net_header_len    = sizeof(struct ipv6hdr),
         .sockaddr_len      = sizeof(struct sockaddr_in6),
 #ifdef CONFIG_COMPAT