Commit 2e3f92da authored by Wei Yongjun's avatar Wei Yongjun Committed by David S. Miller

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: default avatarWei Yongjun <yjwei@cn.fujitsu.com>
Signed-off-by: default avatarVlad Yasevich <vladislav.yasevich@hp.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent cf896d51
......@@ -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;
......
......@@ -2608,6 +2608,51 @@ sctp_disposition_t sctp_sf_do_9_2_shutdown(const struct sctp_endpoint *ep,
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
......
......@@ -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 */
......
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