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@xxxxxxxxxxxxxx>
Reported-by: Hannes Frederic Sowa <hannes@xxxxxxxxxxxxxxxxxxx>
Suggested-by: Vlad Yasevich <vyasevich@xxxxxxxxx>
Signed-off-by: Daniel Borkmann <dborkman@xxxxxxxxxx>
---
net/sctp/input.c | 3 +--
net/sctp/ipv6.c | 2 +-
2 files changed, 2 insertions(+), 3 deletions(-)
diff --git a/net/sctp/input.c b/net/sctp/input.c
index 5f20686..98b69bb 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 4f52e2c..e7b2d4f 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;
}
--
1.7.11.7
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