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sctp: implement report_ftsn for sctp_stream_interleave 

report_ftsn is added as a member of sctp_stream_interleave, used to
skip tsn from tsnmap, remove old events from reasm or lobby queue,
and abort pd for data or idata, called for SCTP_CMD_REPORT_FWDTSN
cmd and asoc reset.

sctp_report_iftsn works for ifwdtsn, and sctp_report_fwdtsn works
for fwdtsn. Note that sctp_report_iftsn doesn't do asoc abort_pd,
as stream abort_pd will be done when handling ifwdtsn. But when
ftsn is equal with ftsn, which means asoc reset, asoc abort_pd has
to be done.

Signed-off-by: Xin Long <lucien.xin@gmail.com>
Acked-by: Marcelo R. Leitner <marcelo.leitner@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Xin Long 2017-12-15 00:41:28 +08:00 committed by David S. Miller
parent 0fc2ea922c
commit 47b20a8856
4 changed files with 52 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
include/net/sctp/stream_interleave.h
View File

@ -51,6 +51,7 @@ struct sctp_stream_interleave {
/* (I-)FORWARD-TSN process */
void (*generate_ftsn)(struct sctp_outq *q, __u32 ctsn);
bool (*validate_ftsn)(struct sctp_chunk *chunk);
void (*report_ftsn)(struct sctp_ulpq *ulpq, __u32 ftsn);
};
void sctp_stream_interleave_init(struct sctp_stream *stream);

9
net/sctp/sm_sideeffect.c
View File

@ -1368,14 +1368,7 @@ static int sctp_cmd_interpreter(enum sctp_event event_type,
break;
case SCTP_CMD_REPORT_FWDTSN:
/* Move the Cumulattive TSN Ack ahead. */
sctp_tsnmap_skip(&asoc->peer.tsn_map, cmd->obj.u32);
/* purge the fragmentation queue */
sctp_ulpq_reasm_flushtsn(&asoc->ulpq, cmd->obj.u32);
/* Abort any in progress partial delivery. */
sctp_ulpq_abort_pd(&asoc->ulpq, GFP_ATOMIC);
asoc->stream.si->report_ftsn(&asoc->ulpq, cmd->obj.u32);
break;
case SCTP_CMD_PROCESS_FWDTSN:

6
net/sctp/stream.c
View File

@ -754,8 +754,7 @@ struct sctp_chunk *sctp_process_strreset_tsnreq(
* performed.
*/
max_tsn_seen = sctp_tsnmap_get_max_tsn_seen(&asoc->peer.tsn_map);
sctp_ulpq_reasm_flushtsn(&asoc->ulpq, max_tsn_seen);
sctp_ulpq_abort_pd(&asoc->ulpq, GFP_ATOMIC);
asoc->stream.si->report_ftsn(&asoc->ulpq, max_tsn_seen);
/* G1: Compute an appropriate value for the Receiver's Next TSN -- the
* TSN that the peer should use to send the next DATA chunk. The
@ -1024,8 +1023,7 @@ struct sctp_chunk *sctp_process_strreset_resp(
&asoc->peer.tsn_map);
LIST_HEAD(temp);
sctp_ulpq_reasm_flushtsn(&asoc->ulpq, mtsn);
sctp_ulpq_abort_pd(&asoc->ulpq, GFP_ATOMIC);
asoc->stream.si->report_ftsn(&asoc->ulpq, mtsn);
sctp_tsnmap_init(&asoc->peer.tsn_map,
SCTP_TSN_MAP_INITIAL,

48
net/sctp/stream_interleave.c
View File

@ -1193,6 +1193,52 @@ static bool sctp_validate_iftsn(struct sctp_chunk *chunk)
return true;
}
static void sctp_report_fwdtsn(struct sctp_ulpq *ulpq, __u32 ftsn)
{
/* Move the Cumulattive TSN Ack ahead. */
sctp_tsnmap_skip(&ulpq->asoc->peer.tsn_map, ftsn);
/* purge the fragmentation queue */
sctp_ulpq_reasm_flushtsn(ulpq, ftsn);
/* Abort any in progress partial delivery. */
sctp_ulpq_abort_pd(ulpq, GFP_ATOMIC);
}
static void sctp_intl_reasm_flushtsn(struct sctp_ulpq *ulpq, __u32 ftsn)
{
struct sk_buff *pos, *tmp;
skb_queue_walk_safe(&ulpq->reasm, pos, tmp) {
struct sctp_ulpevent *event = sctp_skb2event(pos);
__u32 tsn = event->tsn;
if (TSN_lte(tsn, ftsn)) {
__skb_unlink(pos, &ulpq->reasm);
sctp_ulpevent_free(event);
}
}
skb_queue_walk_safe(&ulpq->reasm_uo, pos, tmp) {
struct sctp_ulpevent *event = sctp_skb2event(pos);
__u32 tsn = event->tsn;
if (TSN_lte(tsn, ftsn)) {
__skb_unlink(pos, &ulpq->reasm_uo);
sctp_ulpevent_free(event);
}
}
}
static void sctp_report_iftsn(struct sctp_ulpq *ulpq, __u32 ftsn)
{
/* Move the Cumulattive TSN Ack ahead. */
sctp_tsnmap_skip(&ulpq->asoc->peer.tsn_map, ftsn);
/* purge the fragmentation queue */
sctp_intl_reasm_flushtsn(ulpq, ftsn);
/* abort only when it's for all data */
if (ftsn == sctp_tsnmap_get_max_tsn_seen(&ulpq->asoc->peer.tsn_map))
sctp_intl_abort_pd(ulpq, GFP_ATOMIC);
}
static struct sctp_stream_interleave sctp_stream_interleave_0 = {
.data_chunk_len = sizeof(struct sctp_data_chunk),
.ftsn_chunk_len = sizeof(struct sctp_fwdtsn_chunk),
@ -1208,6 +1254,7 @@ static struct sctp_stream_interleave sctp_stream_interleave_0 = {
/* FORWARD-TSN process functions */
.generate_ftsn = sctp_generate_fwdtsn,
.validate_ftsn = sctp_validate_fwdtsn,
.report_ftsn = sctp_report_fwdtsn,
};
static struct sctp_stream_interleave sctp_stream_interleave_1 = {
@ -1225,6 +1272,7 @@ static struct sctp_stream_interleave sctp_stream_interleave_1 = {
/* I-FORWARD-TSN process functions */
.generate_ftsn = sctp_generate_iftsn,
.validate_ftsn = sctp_validate_iftsn,
.report_ftsn = sctp_report_iftsn,
};
void sctp_stream_interleave_init(struct sctp_stream *stream)