From mboxrd@z Thu Jan 1 00:00:00 1970 From: Fan Du Subject: [PATCH net-next] sctp: Don't lookup dst if transport dst is still valid Date: Fri, 2 Aug 2013 10:45:13 +0800 Message-ID: <1375411513-12551-1-git-send-email-fan.du@windriver.com> Mime-Version: 1.0 Content-Type: text/plain Cc: , To: , Return-path: Received: from mail.windriver.com ([147.11.1.11]:54592 "EHLO mail.windriver.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754355Ab3HBCnY (ORCPT ); Thu, 1 Aug 2013 22:43:24 -0400 Sender: netdev-owner@vger.kernel.org List-ID: When sctp sits on IPv6, sctp_transport_dst_check pass cookie as ZERO, as a result ip6_dst_check always fail out. This behaviour makes transport->dst useless, because every sctp_packet_transmit must look for valid dst. Add a dst_cookie into sctp_transport, and set the cookie whenever we get new dst for sctp_transport. So dst validness could be checked against it. Since I have split genid for IPv4 and IPv6, also delete/add IPv6 address will also bump IPv6 genid. So issues we discussed in: http://marc.info/?l=linux-netdev&m=137404469219410&w=4 have all been sloved for this patch. Signed-off-by: Fan Du --- include/net/sctp/sctp.h | 2 +- include/net/sctp/structs.h | 1 + net/sctp/ipv6.c | 2 +- 3 files changed, 3 insertions(+), 2 deletions(-) diff --git a/include/net/sctp/sctp.h b/include/net/sctp/sctp.h index 554cf88..cb28df9 100644 --- a/include/net/sctp/sctp.h +++ b/include/net/sctp/sctp.h @@ -613,7 +613,7 @@ static inline void sctp_v4_map_v6(union sctp_addr *addr) */ static inline struct dst_entry *sctp_transport_dst_check(struct sctp_transport *t) { - if (t->dst && !dst_check(t->dst, 0)) { + if (t->dst && !dst_check(t->dst, t->dst_cookie)) { dst_release(t->dst); t->dst = NULL; } diff --git a/include/net/sctp/structs.h b/include/net/sctp/structs.h index 75c4c16..c0f4e29 100644 --- a/include/net/sctp/structs.h +++ b/include/net/sctp/structs.h @@ -946,6 +946,7 @@ struct sctp_transport { __u64 hb_nonce; struct rcu_head rcu; + u32 dst_cookie; }; struct sctp_transport *sctp_transport_new(struct net *, const union sctp_addr *, diff --git a/net/sctp/ipv6.c b/net/sctp/ipv6.c index 85d688f..5a9402e 100644 --- a/net/sctp/ipv6.c +++ b/net/sctp/ipv6.c @@ -351,7 +351,7 @@ out: rt = (struct rt6_info *)dst; t->dst = dst; - + t->dst_cookie = rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0; pr_debug("rt6_dst:%pI6 rt6_src:%pI6\n", &rt->rt6i_dst.addr, &fl6->saddr); } else { -- 1.7.1