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author | Wei Yongjun <yjwei@cn.fujitsu.com> | 2008-10-23 08:01:18 (GMT) |
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committer | David S. Miller <davem@davemloft.net> | 2008-10-23 08:01:18 (GMT) |
commit | 2e3f92dad6bdbee796274bae5c1c50a6ddd31cbb (patch) | |
tree | e4a08c8d2c43d8fc45937fe9db85f616d2f7c7a1 /net/sctp/sm_statefuns.c | |
parent | cf896d514a4564027929a6d284872c74987085ef (diff) | |
download | linux-2e3f92dad6bdbee796274bae5c1c50a6ddd31cbb.tar.xz |
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.c | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/net/sctp/sm_statefuns.c b/net/sctp/sm_statefuns.c index 12f6217..a6a0ea7 100644 --- 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 |