sctp: Fix to handle SHUTDOWN in SHUTDOWN_RECEIVED state

Once an endpoint has reached the SHUTDOWN-RECEIVED state,
it MUST NOT send a SHUTDOWN in response to a ULP request.
The Cumulative TSN Ack of the received SHUTDOWN chunk
MUST be processed.

This patch fix to process Cumulative TSN Ack of the received
SHUTDOWN chunk in SHUTDOWN_RECEIVED state.

Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com>
Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/net/sctp/sm.h b/include/net/sctp/sm.h
index 029a54a..c1dd893 100644 (file)
--- a/include/net/sctp/sm.h
+++ b/include/net/sctp/sm.h
@@ -125,6 +125,7 @@ sctp_state_fn_t sctp_sf_beat_8_3;
 sctp_state_fn_t sctp_sf_backbeat_8_3;
 sctp_state_fn_t sctp_sf_do_9_2_final;
 sctp_state_fn_t sctp_sf_do_9_2_shutdown;
+sctp_state_fn_t sctp_sf_do_9_2_shut_ctsn;
 sctp_state_fn_t sctp_sf_do_ecn_cwr;
 sctp_state_fn_t sctp_sf_do_ecne;
 sctp_state_fn_t sctp_sf_ootb;

diff --git a/net/sctp/sm_statefuns.c b/net/sctp/sm_statefuns.c
index 12f6217..a6a0ea7 100644 (file)
--- a/net/sctp/sm_statefuns.c
+++ b/net/sctp/sm_statefuns.c
@@ -2608,6 +2608,51 @@ out:
        return disposition;
 }
 
+/*
+ * sctp_sf_do_9_2_shut_ctsn
+ *
+ * Once an endpoint has reached the SHUTDOWN-RECEIVED state,
+ * it MUST NOT send a SHUTDOWN in response to a ULP request.
+ * The Cumulative TSN Ack of the received SHUTDOWN chunk
+ * MUST be processed.
+ */
+sctp_disposition_t sctp_sf_do_9_2_shut_ctsn(const struct sctp_endpoint *ep,
+                                          const struct sctp_association *asoc,
+                                          const sctp_subtype_t type,
+                                          void *arg,
+                                          sctp_cmd_seq_t *commands)
+{
+       struct sctp_chunk *chunk = arg;
+       sctp_shutdownhdr_t *sdh;
+
+       if (!sctp_vtag_verify(chunk, asoc))
+               return sctp_sf_pdiscard(ep, asoc, type, arg, commands);
+
+       /* Make sure that the SHUTDOWN chunk has a valid length. */
+       if (!sctp_chunk_length_valid(chunk,
+                                     sizeof(struct sctp_shutdown_chunk_t)))
+               return sctp_sf_violation_chunklen(ep, asoc, type, arg,
+                                                 commands);
+
+       sdh = (sctp_shutdownhdr_t *)chunk->skb->data;
+
+       /* If Cumulative TSN Ack beyond the max tsn currently
+        * send, terminating the association and respond to the
+        * sender with an ABORT.
+        */
+       if (!TSN_lt(ntohl(sdh->cum_tsn_ack), asoc->next_tsn))
+               return sctp_sf_violation_ctsn(ep, asoc, type, arg, commands);
+
+       /* verify, by checking the Cumulative TSN Ack field of the
+        * chunk, that all its outstanding DATA chunks have been
+        * received by the SHUTDOWN sender.
+        */
+       sctp_add_cmd_sf(commands, SCTP_CMD_PROCESS_CTSN,
+                       SCTP_BE32(sdh->cum_tsn_ack));
+
+       return SCTP_DISPOSITION_CONSUME;
+}
+
 /* RFC 2960 9.2
  * If an endpoint is in SHUTDOWN-ACK-SENT state and receives an INIT chunk
  * (e.g., if the SHUTDOWN COMPLETE was lost) with source and destination

diff --git a/net/sctp/sm_statetable.c b/net/sctp/sm_statetable.c
index a5b5590..5c8186d 100644 (file)
--- a/net/sctp/sm_statetable.c
+++ b/net/sctp/sm_statetable.c
@@ -270,7 +270,7 @@ const sctp_sm_table_entry_t *sctp_sm_lookup_event(sctp_event_t event_type,
        /* SCTP_STATE_SHUTDOWN_SENT */ \
        TYPE_SCTP_FUNC(sctp_sf_do_9_2_shutdown_ack), \
        /* SCTP_STATE_SHUTDOWN_RECEIVED */ \
-       TYPE_SCTP_FUNC(sctp_sf_discard_chunk), \
+       TYPE_SCTP_FUNC(sctp_sf_do_9_2_shut_ctsn), \
        /* SCTP_STATE_SHUTDOWN_ACK_SENT */ \
        TYPE_SCTP_FUNC(sctp_sf_discard_chunk), \
 } /* TYPE_SCTP_SHUTDOWN */