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sctp: correctly mark missing chunks in fast recovery

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According to RFC 4960 Section 7.2.4:
 					If an endpoint is in Fast
   Recovery and a SACK arrives that advances the Cumulative TSN Ack
   Point, the miss indications are incremented for all TSNs reported
   missing in the SACK.

Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>
This commit is contained in:
Vlad Yasevich 2010-04-30 22:41:10 -04:00
parent 6588337189
commit ea862c8d1f
1 changed files with 13 additions and 5 deletions
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18
net/sctp/outqueue.c
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@ -1154,6 +1154,7 @@ int sctp_outq_sack(struct sctp_outq *q, struct sctp_sackhdr *sack)
struct sctp_transport *primary = asoc->peer.primary_path;
int count_of_newacks = 0;
int gap_ack_blocks;
u8 accum_moved = 0;
/* Grab the association's destination address list. */
transport_list = &asoc->peer.transport_addr_list;
@ -1232,16 +1233,22 @@ int sctp_outq_sack(struct sctp_outq *q, struct sctp_sackhdr *sack)
count_of_newacks ++;
}
/* Move the Cumulative TSN Ack Point if appropriate. */
if (TSN_lt(asoc->ctsn_ack_point, sack_ctsn)) {
asoc->ctsn_ack_point = sack_ctsn;
accum_moved = 1;
}
if (gap_ack_blocks) {
if (asoc->fast_recovery && accum_moved)
highest_new_tsn = highest_tsn;
list_for_each_entry(transport, transport_list, transports)
sctp_mark_missing(q, &transport->transmitted, transport,
highest_new_tsn, count_of_newacks);
}
/* Move the Cumulative TSN Ack Point if appropriate. */
if (TSN_lt(asoc->ctsn_ack_point, sack_ctsn))
asoc->ctsn_ack_point = sack_ctsn;
/* Update unack_data field in the assoc. */
sctp_sack_update_unack_data(asoc, sack);
@ -1685,7 +1692,8 @@ static void sctp_mark_missing(struct sctp_outq *q,
struct sctp_chunk *chunk;
__u32 tsn;
char do_fast_retransmit = 0;
struct sctp_transport *primary = q->asoc->peer.primary_path;
struct sctp_association *asoc = q->asoc;
struct sctp_transport *primary = asoc->peer.primary_path;
list_for_each_entry(chunk, transmitted_queue, transmitted_list) {