Commit e4e7ba12 authored by Daniel Borkmann's avatar Daniel Borkmann Committed by Greg Kroah-Hartman

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

[ Upstream commit 3f96a532 ]

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: default avatarDuan Jiong <duanj.fnst@cn.fujitsu.com>
Reported-by: default avatarHannes Frederic Sowa <hannes@stressinduktion.org>
Suggested-by: default avatarVlad Yasevich <vyasevich@gmail.com>
Signed-off-by: default avatarDaniel Borkmann <dborkman@redhat.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent fa42a01c
......@@ -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;
}
......
......@@ -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;
}
......
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