net: sctp: rfc4443: do not report ICMP redirects to user space

[ Upstream commit 3f96a532113131d5a65ac9e00fc83cfa31b0295f ]

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/net/sctp/input.c b/net/sctp/input.c
index 4b2c831..bd4fb45 100644 (file)
--- a/net/sctp/input.c
+++ b/net/sctp/input.c
@@ -648,8 +648,7 @@ 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 d70cabb..422d8bd 100644 (file)
--- a/net/sctp/ipv6.c
+++ b/net/sctp/ipv6.c
@@ -189,7 +189,7 @@ SCTP_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;
        }