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authorDaniel Borkmann <dborkman@redhat.com>2013-09-16 12:36:02 +0200
committerDavid S. Miller <davem@davemloft.net>2013-09-16 21:40:15 -0400
commit3f96a532113131d5a65ac9e00fc83cfa31b0295f (patch)
treeacf78191cb5bce2865b1055dcbf579e9468b6ac0 /net/sctp
parentd82a7f54b9daadca8e19dd3ce31e02bf2f7445c9 (diff)
downloadlinux-3f96a532113131d5a65ac9e00fc83cfa31b0295f.tar.gz
net: sctp: rfc4443: do not report ICMP redirects to user space
Adapt the same behaviour for SCTP as present in TCP for ICMP redirect messages. For IPv6, RFC4443, section 2.4. says: ... (e) An ICMPv6 error message MUST NOT be originated as a result of receiving the following: ... (e.2) An ICMPv6 redirect message [IPv6-DISC]. ... Therefore, do not report an error to user space, just invoke dst's redirect callback and leave, same for IPv4 as done in TCP as well. The implication w/o having this patch could be that the reception of such packets would generate a poll notification and in worst case it could even tear down the whole connection. Therefore, stop updating sk_err on redirects. Reported-by: Duan Jiong <duanj.fnst@cn.fujitsu.com> Reported-by: Hannes Frederic Sowa <hannes@stressinduktion.org> Suggested-by: Vlad Yasevich <vyasevich@gmail.com> Signed-off-by: Daniel Borkmann <dborkman@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sctp')
-rw-r--r--net/sctp/input.c3
-rw-r--r--net/sctp/ipv6.c2
2 files changed, 2 insertions, 3 deletions
diff --git a/net/sctp/input.c b/net/sctp/input.c
index 5f2068679f8..98b69bbecdd 100644
--- a/net/sctp/input.c
+++ b/net/sctp/input.c
@@ -634,8 +634,7 @@ void sctp_v4_err(struct sk_buff *skb, __u32 info)
break;
case ICMP_REDIRECT:
sctp_icmp_redirect(sk, transport, skb);
- err = 0;
- break;
+ /* Fall through to out_unlock. */
default:
goto out_unlock;
}
diff --git a/net/sctp/ipv6.c b/net/sctp/ipv6.c
index 4f52e2ce263..e7b2d4fe2b6 100644
--- a/net/sctp/ipv6.c
+++ b/net/sctp/ipv6.c
@@ -183,7 +183,7 @@ static void sctp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
break;
case NDISC_REDIRECT:
sctp_icmp_redirect(sk, transport, skb);
- break;
+ goto out_unlock;
default:
break;
}