[SCTP]: extend exported data in /proc/net/sctp/assoc

RFC 3873 specifies several MIB objects that can't be obtained by the
current data set exported by /proc/sys/net/sctp/assoc.  This patch
adds the missing pieces of data that allow us to compute all the
objects in the sctpAssocTable object.

Signed-off-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

4 files changed, 27 insertions, 6 deletions

diff --git a/include/net/sctp/structs.h b/include/net/sctp/structs.h
index 9c827a749b6f..8966599ddb9f 100644
--- a/include/net/sctp/structs.h
+++ b/include/net/sctp/structs.h
@@ -1661,6 +1661,9 @@ struct sctp_association {
         /* Transport to which SHUTDOWN chunk was last sent.  */
         struct sctp_transport *shutdown_last_sent_to;
 
+        /* How many times have we resent a SHUTDOWN */
+        int shutdown_retries;
+
         /* Transport to which INIT chunk was last sent.  */
         struct sctp_transport *init_last_sent_to;
 
@@ -1695,6 +1698,11 @@ struct sctp_association {
          */
         __u16 unack_data;
 
+        /* The total number of data chunks that we've had to retransmit
+         * as the result of a T3 timer expiration
+         */
+        __u32 rtx_data_chunks;
+
         /* This is the association's receive buffer space.  This value is used
          * to set a_rwnd field in an INIT or a SACK chunk.
          */
diff --git a/net/sctp/outqueue.c b/net/sctp/outqueue.c
index 1bb3c5c35d2a..fd4deefab3cf 100644
--- a/net/sctp/outqueue.c
+++ b/net/sctp/outqueue.c
@@ -494,6 +494,8 @@ void sctp_retransmit(struct sctp_outq *q, struct sctp_transport *transport,
                  */
                 if (transport == transport->asoc->peer.retran_path)
                         sctp_assoc_update_retran_path(transport->asoc);
+                transport->asoc->rtx_data_chunks +=
+                        transport->asoc->unack_data;
                 break;
         case SCTP_RTXR_FAST_RTX:
                 SCTP_INC_STATS(SCTP_MIB_FAST_RETRANSMITS);
@@ -504,6 +506,7 @@ void sctp_retransmit(struct sctp_outq *q, struct sctp_transport *transport,
                 break;
         case SCTP_RTXR_T1_RTX:
                 SCTP_INC_STATS(SCTP_MIB_T1_RETRANSMITS);
+                transport->asoc->init_retries++;
                 break;
         default:
                 BUG();
diff --git a/net/sctp/proc.c b/net/sctp/proc.c
index 9e214da82d9e..82bea300308d 100644
--- a/net/sctp/proc.c
+++ b/net/sctp/proc.c
@@ -281,8 +281,10 @@ static void * sctp_assocs_seq_start(struct seq_file *seq, loff_t *pos)
                 *pos = 0;
 
         if (*pos == 0)
-                seq_printf(seq, " ASSOC     SOCK   STY SST ST HBKT ASSOC-ID TX_QUEUE RX_QUEUE UID INODE LPORT "
-                                "RPORT LADDRS <-> RADDRS\n");
+                seq_printf(seq, " ASSOC     SOCK   STY SST ST HBKT "
+                                "ASSOC-ID TX_QUEUE RX_QUEUE UID INODE LPORT "
+                                "RPORT LADDRS <-> RADDRS "
+                                "HBINT INS OUTS MAXRT T1X T2X RTXC\n");
 
         return (void *)pos;
 }
@@ -321,15 +323,21 @@ static int sctp_assocs_seq_show(struct seq_file *seq, void *v)
                 assoc = sctp_assoc(epb);
                 sk = epb->sk;
                 seq_printf(seq,
-                           "%8p %8p %-3d %-3d %-2d %-4d %4d %8d %8d %7d %5lu %-5d %5d ",
+                           "%8p %8p %-3d %-3d %-2d %-4d "
+                           "%4d %8d %8d %7d %5lu %-5d %5d "
+                           "%8d %5d %5d %4d %4d %4d %8d ",
                            assoc, sk, sctp_sk(sk)->type, sk->sk_state,
-                           assoc->state, hash, assoc->assoc_id,
+                           assoc->state, hash,
+                           assoc->assoc_id,
                            assoc->sndbuf_used,
                            atomic_read(&assoc->rmem_alloc),
                            sock_i_uid(sk), sock_i_ino(sk),
                            epb->bind_addr.port,
-                           assoc->peer.port);
-
+                           assoc->peer.port,
+                           assoc->hbinterval, assoc->c.sinit_max_instreams,
+                           assoc->c.sinit_num_ostreams, assoc->max_retrans,
+                           assoc->init_retries, assoc->shutdown_retries,
+                           assoc->rtx_data_chunks);
                 seq_printf(seq, " ");
                 sctp_seq_dump_local_addrs(seq, epb);
                 seq_printf(seq, "<-> ");
diff --git a/net/sctp/sm_statefuns.c b/net/sctp/sm_statefuns.c
index f2ed6473feef..ade0cbd3a52b 100644
--- a/net/sctp/sm_statefuns.c
+++ b/net/sctp/sm_statefuns.c
@@ -5312,6 +5312,8 @@ sctp_disposition_t sctp_sf_t2_timer_expire(const struct sctp_endpoint *ep,
         SCTP_DEBUG_PRINTK("Timer T2 expired.\n");
         SCTP_INC_STATS(SCTP_MIB_T2_SHUTDOWN_EXPIREDS);
 
+        ((struct sctp_association *)asoc)->shutdown_retries++;
+
         if (asoc->overall_error_count >= asoc->max_retrans) {
                 sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR,
                                 SCTP_ERROR(ETIMEDOUT));