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sctp: not copying duplicate addrs to the assoc's bind address list

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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 <lucien.xin@gmail.com>
Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Xin Long 2016-12-20 13:49:50 +08:00 committed by David S. Miller
parent 165f2cf640
commit b8607805dd
2 changed files with 6 additions and 0 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

3
net/sctp/bind_addr.c
View file

@ -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;

3
net/sctp/protocol.c
View file

@ -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)