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authorWei Yongjun <yjwei@cn.fujitsu.com>2008-10-23 04:01:18 -0400
committerDavid S. Miller <davem@davemloft.net>2008-10-23 04:01:18 -0400
commit2e3f92dad6bdbee796274bae5c1c50a6ddd31cbb (patch)
treee4a08c8d2c43d8fc45937fe9db85f616d2f7c7a1 /net/sctp/sm_statefuns.c
parentcf896d514a4564027929a6d284872c74987085ef (diff)
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>
Diffstat (limited to 'net/sctp/sm_statefuns.c')
-rw-r--r--net/sctp/sm_statefuns.c45
1 files changed, 45 insertions, 0 deletions
diff --git a/net/sctp/sm_statefuns.c b/net/sctp/sm_statefuns.c
index 12f62174f4a1..a6a0ea71ae93 100644
--- a/net/sctp/sm_statefuns.c
+++ b/net/sctp/sm_statefuns.c
@@ -2608,6 +2608,51 @@ out:
2608 return disposition; 2608 return disposition;
2609} 2609}
2610 2610
2611/*
2612 * sctp_sf_do_9_2_shut_ctsn
2613 *
2614 * Once an endpoint has reached the SHUTDOWN-RECEIVED state,
2615 * it MUST NOT send a SHUTDOWN in response to a ULP request.
2616 * The Cumulative TSN Ack of the received SHUTDOWN chunk
2617 * MUST be processed.
2618 */
2619sctp_disposition_t sctp_sf_do_9_2_shut_ctsn(const struct sctp_endpoint *ep,
2620 const struct sctp_association *asoc,
2621 const sctp_subtype_t type,
2622 void *arg,
2623 sctp_cmd_seq_t *commands)
2624{
2625 struct sctp_chunk *chunk = arg;
2626 sctp_shutdownhdr_t *sdh;
2627
2628 if (!sctp_vtag_verify(chunk, asoc))
2629 return sctp_sf_pdiscard(ep, asoc, type, arg, commands);
2630
2631 /* Make sure that the SHUTDOWN chunk has a valid length. */
2632 if (!sctp_chunk_length_valid(chunk,
2633 sizeof(struct sctp_shutdown_chunk_t)))
2634 return sctp_sf_violation_chunklen(ep, asoc, type, arg,
2635 commands);
2636
2637 sdh = (sctp_shutdownhdr_t *)chunk->skb->data;
2638
2639 /* If Cumulative TSN Ack beyond the max tsn currently
2640 * send, terminating the association and respond to the
2641 * sender with an ABORT.
2642 */
2643 if (!TSN_lt(ntohl(sdh->cum_tsn_ack), asoc->next_tsn))
2644 return sctp_sf_violation_ctsn(ep, asoc, type, arg, commands);
2645
2646 /* verify, by checking the Cumulative TSN Ack field of the
2647 * chunk, that all its outstanding DATA chunks have been
2648 * received by the SHUTDOWN sender.
2649 */
2650 sctp_add_cmd_sf(commands, SCTP_CMD_PROCESS_CTSN,
2651 SCTP_BE32(sdh->cum_tsn_ack));
2652
2653 return SCTP_DISPOSITION_CONSUME;
2654}
2655
2611/* RFC 2960 9.2 2656/* RFC 2960 9.2
2612 * If an endpoint is in SHUTDOWN-ACK-SENT state and receives an INIT chunk 2657 * If an endpoint is in SHUTDOWN-ACK-SENT state and receives an INIT chunk
2613 * (e.g., if the SHUTDOWN COMPLETE was lost) with source and destination 2658 * (e.g., if the SHUTDOWN COMPLETE was lost) with source and destination