From b8607805dd157d5f93372f338b3f3b9018c507d7 Mon Sep 17 00:00:00 2001 From: Xin Long Date: Tue, 20 Dec 2016 13:49:50 +0800 Subject: [PATCH] sctp: not copying duplicate addrs to the assoc's bind address list sctp.local_addr_list is a global address list that is supposed to include all the local addresses. sctp updates this list according to NETDEV_UP/ NETDEV_DOWN notifications. However, if multiple NICs have the same address, the global list would have duplicate addresses. Even if for one NIC, promote secondaries in __inet_del_ifa can also lead to accumulating duplicate addresses. When sctp binds address 'ANY' and creates a connection, it copies all the addresses from global list into asoc's bind addr list, which makes sctp pack the duplicate addresses into INIT/INIT_ACK packets. This patch is to filter the duplicate addresses when copying the addrs from global list in sctp_copy_local_addr_list and unpacking addr_param from cookie in sctp_raw_to_bind_addrs to asoc's bind addr list. Note that we can't filter the duplicate addrs when global address list gets updated, As NETDEV_DOWN event may remove an addr that still exists in another NIC. Signed-off-by: Xin Long Acked-by: Marcelo Ricardo Leitner Signed-off-by: David S. Miller --- net/sctp/bind_addr.c | 3 +++ net/sctp/protocol.c | 3 +++ 2 files changed, 6 insertions(+) diff --git a/net/sctp/bind_addr.c b/net/sctp/bind_addr.c index 401c60750b20..1ebc184a0e23 100644 --- a/net/sctp/bind_addr.c +++ b/net/sctp/bind_addr.c @@ -292,6 +292,8 @@ int sctp_raw_to_bind_addrs(struct sctp_bind_addr *bp, __u8 *raw_addr_list, } af->from_addr_param(&addr, rawaddr, htons(port), 0); + if (sctp_bind_addr_state(bp, &addr) != -1) + goto next; retval = sctp_add_bind_addr(bp, &addr, sizeof(addr), SCTP_ADDR_SRC, gfp); if (retval) { @@ -300,6 +302,7 @@ int sctp_raw_to_bind_addrs(struct sctp_bind_addr *bp, __u8 *raw_addr_list, break; } +next: len = ntohs(param->length); addrs_len -= len; raw_addr_list += len; diff --git a/net/sctp/protocol.c b/net/sctp/protocol.c index da5d82bec1dc..616a9428e0c4 100644 --- a/net/sctp/protocol.c +++ b/net/sctp/protocol.c @@ -220,6 +220,9 @@ int sctp_copy_local_addr_list(struct net *net, struct sctp_bind_addr *bp, !(copy_flags & SCTP_ADDR6_PEERSUPP))) continue; + if (sctp_bind_addr_state(bp, &addr->a) != -1) + continue; + error = sctp_add_bind_addr(bp, &addr->a, sizeof(addr->a), SCTP_ADDR_SRC, GFP_ATOMIC); if (error) -- 2.30.2