sctp: do trace_sctp_probe after SACK validation and check

The function sctp_sf_eat_sack_6_2 now performs the Verification
Tag validation, Chunk length validation, Bogu check, and also
the detection of out-of-order SACK based on the RFC2960
Section 6.2 at the beginning, and finally performs the further
processing of SACK. The trace_sctp_probe now triggered before
the above necessary validation and check.

this patch is to do the trace_sctp_probe after the chunk sanity
tests, but keep doing trace if the SACK received is out of order,
for the out-of-order SACK is valuable to congestion control
debugging.

v1->v2:
 - keep doing SCTP trace if the SACK is out of order as Marcelo's
   suggestion.
v2->v3:
 - regenerate the patch as v2 generated on top of v1, and add
   'net-next' tag to the new one as Marcelo's comments.

Signed-off-by: Kevin Kou <qdkevin.kou@gmail.com>
Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/sctp/sm_statefuns.c b/net/sctp/sm_statefuns.c
index 42558fa..748e3b1 100644 (file)
--- a/net/sctp/sm_statefuns.c
+++ b/net/sctp/sm_statefuns.c
@@ -3281,8 +3281,6 @@ enum sctp_disposition sctp_sf_eat_sack_6_2(struct net *net,
        struct sctp_sackhdr *sackh;
        __u32 ctsn;
 
-       trace_sctp_probe(ep, asoc, chunk);
-
        if (!sctp_vtag_verify(chunk, asoc))
                return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands);
 
@@ -3299,6 +3297,15 @@ enum sctp_disposition sctp_sf_eat_sack_6_2(struct net *net,
        chunk->subh.sack_hdr = sackh;
        ctsn = ntohl(sackh->cum_tsn_ack);
 
+       /* If Cumulative TSN Ack beyond the max tsn currently
+        * send, terminating the association and respond to the
+        * sender with an ABORT.
+        */
+       if (TSN_lte(asoc->next_tsn, ctsn))
+               return sctp_sf_violation_ctsn(net, ep, asoc, type, arg, commands);
+
+       trace_sctp_probe(ep, asoc, chunk);
+
        /* i) If Cumulative TSN Ack is less than the Cumulative TSN
         *     Ack Point, then drop the SACK.  Since Cumulative TSN
         *     Ack is monotonically increasing, a SACK whose
@@ -3312,13 +3319,6 @@ enum sctp_disposition sctp_sf_eat_sack_6_2(struct net *net,
                return SCTP_DISPOSITION_DISCARD;
        }
 
-       /* If Cumulative TSN Ack beyond the max tsn currently
-        * send, terminating the association and respond to the
-        * sender with an ABORT.
-        */
-       if (!TSN_lt(ctsn, asoc->next_tsn))
-               return sctp_sf_violation_ctsn(net, ep, asoc, type, arg, commands);
-
        /* Return this SACK for further processing.  */
        sctp_add_cmd_sf(commands, SCTP_CMD_PROCESS_SACK, SCTP_CHUNK(chunk));