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authorMarcelo Ricardo Leitner <marcelo.leitner@gmail.com>2018-01-05 16:17:18 +0300
committerDavid S. Miller <davem@davemloft.net>2018-01-08 22:19:13 +0300
commitb6c5734db07079c9410147b32407f2366d584e6c (patch)
tree9457df95b044173230c2327569a5d944ae0e76fe /net/sctp/input.c
parentcc35c3d1edf7a8373a1a5daa80a912dec96a9cd5 (diff)
downloadlinux-b6c5734db07079c9410147b32407f2366d584e6c.tar.xz
sctp: fix the handling of ICMP Frag Needed for too small MTUs
syzbot reported a hang involving SCTP, on which it kept flooding dmesg with the message: [ 246.742374] sctp: sctp_transport_update_pmtu: Reported pmtu 508 too low, using default minimum of 512 That happened because whenever SCTP hits an ICMP Frag Needed, it tries to adjust to the new MTU and triggers an immediate retransmission. But it didn't consider the fact that MTUs smaller than the SCTP minimum MTU allowed (512) would not cause the PMTU to change, and issued the retransmission anyway (thus leading to another ICMP Frag Needed, and so on). As IPv4 (ip_rt_min_pmtu=556) and IPv6 (IPV6_MIN_MTU=1280) minimum MTU are higher than that, sctp_transport_update_pmtu() is changed to re-fetch the PMTU that got set after our request, and with that, detect if there was an actual change or not. The fix, thus, skips the immediate retransmission if the received ICMP resulted in no change, in the hope that SCTP will select another path. Note: The value being used for the minimum MTU (512, SCTP_DEFAULT_MINSEGMENT) is not right and instead it should be (576, SCTP_MIN_PMTU), but such change belongs to another patch. Changes from v1: - do not disable PMTU discovery, in the light of commit 06ad391919b2 ("[SCTP] Don't disable PMTU discovery when mtu is small") and as suggested by Xin Long. - changed the way to break the rtx loop by detecting if the icmp resulted in a change or not Changes from v2: none See-also: https://lkml.org/lkml/2017/12/22/811 Reported-by: syzbot <syzkaller@googlegroups.com> Signed-off-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sctp/input.c')
-rw-r--r--net/sctp/input.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/net/sctp/input.c b/net/sctp/input.c
index 9320661cc41d..141c9c466ec1 100644
--- a/net/sctp/input.c
+++ b/net/sctp/input.c
@@ -406,8 +406,12 @@ void sctp_icmp_frag_needed(struct sock *sk, struct sctp_association *asoc,
*/
return;
- /* Update transports view of the MTU */
- sctp_transport_update_pmtu(t, pmtu);
+ /* Update transports view of the MTU. Return if no update was needed.
+ * If an update wasn't needed/possible, it also doesn't make sense to
+ * try to retransmit now.
+ */
+ if (!sctp_transport_update_pmtu(t, pmtu))
+ return;
/* Update association pmtu. */
sctp_assoc_sync_pmtu(asoc);