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159f2a7456
linux/net/sctp/stream.c
Xin Long 159f2a7456 sctp: avoid flushing unsent queue when doing asoc reset 
Now when doing asoc reset, it cleans up sacked and abandoned queues
by calling sctp_outq_free where it also cleans up unsent, retransmit
and transmitted queues.

It's safe for the sender of response, as these 3 queues are empty at
that time. But when the receiver of response is doing the reset, the
users may already enqueue some chunks into unsent during the time
waiting the response, and these chunks should not be flushed.

To void the chunks in it would be removed, it moves the queue into a
temp list, then gets it back after sctp_outq_free is done.

The patch also fixes some incorrect comments in
sctp_process_strreset_tsnreq.

Signed-off-by: Xin Long <lucien.xin@gmail.com>
Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2017-11-28 00:38:45 +09:00

1103 lines
27 KiB
C
Raw Blame History

/* SCTP kernel implementation
* (C) Copyright IBM Corp. 2001, 2004
* Copyright (c) 1999-2000 Cisco, Inc.
* Copyright (c) 1999-2001 Motorola, Inc.
* Copyright (c) 2001 Intel Corp.
*
* This file is part of the SCTP kernel implementation
*
* These functions manipulate sctp tsn mapping array.
*
* This SCTP implementation is free software;
* you can redistribute it and/or modify it under the terms of
* the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This SCTP implementation is distributed in the hope that it
* will be useful, but WITHOUT ANY WARRANTY; without even the implied
* ************************
* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNU CC; see the file COPYING. If not, see
* <http://www.gnu.org/licenses/>.
*
* Please send any bug reports or fixes you make to the
* email address(es):
* lksctp developers <linux-sctp@vger.kernel.org>
*
* Written or modified by:
* Xin Long <lucien.xin@gmail.com>
*/
#include <linux/list.h>
#include <net/sctp/sctp.h>
#include <net/sctp/sm.h>
#include <net/sctp/stream_sched.h>
/* Migrates chunks from stream queues to new stream queues if needed,
* but not across associations. Also, removes those chunks to streams
* higher than the new max.
*/
static void sctp_stream_outq_migrate(struct sctp_stream *stream,
struct sctp_stream *new, __u16 outcnt)
{
struct sctp_association *asoc;
struct sctp_chunk *ch, *temp;
struct sctp_outq *outq;
int i;
asoc = container_of(stream, struct sctp_association, stream);
outq = &asoc->outqueue;
list_for_each_entry_safe(ch, temp, &outq->out_chunk_list, list) {
__u16 sid = sctp_chunk_stream_no(ch);
if (sid < outcnt)
continue;
sctp_sched_dequeue_common(outq, ch);
/* No need to call dequeue_done here because
* the chunks are not scheduled by now.
*/
/* Mark as failed send. */
sctp_chunk_fail(ch, SCTP_ERROR_INV_STRM);
if (asoc->peer.prsctp_capable &&
SCTP_PR_PRIO_ENABLED(ch->sinfo.sinfo_flags))
asoc->sent_cnt_removable--;
sctp_chunk_free(ch);
}
if (new) {
/* Here we actually move the old ext stuff into the new
* buffer, because we want to keep it. Then
* sctp_stream_update will swap ->out pointers.
*/
for (i = 0; i < outcnt; i++) {
kfree(new->out[i].ext);
new->out[i].ext = stream->out[i].ext;
stream->out[i].ext = NULL;
}
}
for (i = outcnt; i < stream->outcnt; i++)
kfree(stream->out[i].ext);
}
static int sctp_stream_alloc_out(struct sctp_stream *stream, __u16 outcnt,
gfp_t gfp)
{
struct sctp_stream_out *out;
out = kmalloc_array(outcnt, sizeof(*out), gfp);
if (!out)
return -ENOMEM;
if (stream->out) {
memcpy(out, stream->out, min(outcnt, stream->outcnt) *
sizeof(*out));
kfree(stream->out);
}
if (outcnt > stream->outcnt)
memset(out + stream->outcnt, 0,
(outcnt - stream->outcnt) * sizeof(*out));
stream->out = out;
return 0;
}
static int sctp_stream_alloc_in(struct sctp_stream *stream, __u16 incnt,
gfp_t gfp)
{
struct sctp_stream_in *in;
in = kmalloc_array(incnt, sizeof(*stream->in), gfp);
if (!in)
return -ENOMEM;
if (stream->in) {
memcpy(in, stream->in, min(incnt, stream->incnt) *
sizeof(*in));
kfree(stream->in);
}
if (incnt > stream->incnt)
memset(in + stream->incnt, 0,
(incnt - stream->incnt) * sizeof(*in));
stream->in = in;
return 0;
}
int sctp_stream_init(struct sctp_stream *stream, __u16 outcnt, __u16 incnt,
gfp_t gfp)
{
struct sctp_sched_ops *sched = sctp_sched_ops_from_stream(stream);
int i, ret = 0;
gfp |= __GFP_NOWARN;
/* Initial stream->out size may be very big, so free it and alloc
* a new one with new outcnt to save memory if needed.
*/
if (outcnt == stream->outcnt)
goto in;
/* Filter out chunks queued on streams that won't exist anymore */
sched->unsched_all(stream);
sctp_stream_outq_migrate(stream, NULL, outcnt);
sched->sched_all(stream);
i = sctp_stream_alloc_out(stream, outcnt, gfp);
if (i)
return i;
stream->outcnt = outcnt;
for (i = 0; i < stream->outcnt; i++)
stream->out[i].state = SCTP_STREAM_OPEN;
sched->init(stream);
in:
if (!incnt)
goto out;
i = sctp_stream_alloc_in(stream, incnt, gfp);
if (i) {
ret = -ENOMEM;
goto free;
}
stream->incnt = incnt;
goto out;
free:
sched->free(stream);
kfree(stream->out);
stream->out = NULL;
out:
return ret;
}
int sctp_stream_init_ext(struct sctp_stream *stream, __u16 sid)
{
struct sctp_stream_out_ext *soute;
soute = kzalloc(sizeof(*soute), GFP_KERNEL);
if (!soute)
return -ENOMEM;
stream->out[sid].ext = soute;
return sctp_sched_init_sid(stream, sid, GFP_KERNEL);
}
void sctp_stream_free(struct sctp_stream *stream)
{
struct sctp_sched_ops *sched = sctp_sched_ops_from_stream(stream);
int i;
sched->free(stream);
for (i = 0; i < stream->outcnt; i++)
kfree(stream->out[i].ext);
kfree(stream->out);
kfree(stream->in);
}
void sctp_stream_clear(struct sctp_stream *stream)
{
int i;
for (i = 0; i < stream->outcnt; i++)
stream->out[i].ssn = 0;
for (i = 0; i < stream->incnt; i++)
stream->in[i].ssn = 0;
}
void sctp_stream_update(struct sctp_stream *stream, struct sctp_stream *new)
{
struct sctp_sched_ops *sched = sctp_sched_ops_from_stream(stream);
sched->unsched_all(stream);
sctp_stream_outq_migrate(stream, new, new->outcnt);
sctp_stream_free(stream);
stream->out = new->out;
stream->in = new->in;
stream->outcnt = new->outcnt;
stream->incnt = new->incnt;
sched->sched_all(stream);
new->out = NULL;
new->in = NULL;
}
static int sctp_send_reconf(struct sctp_association *asoc,
struct sctp_chunk *chunk)
{
struct net *net = sock_net(asoc->base.sk);
int retval = 0;
retval = sctp_primitive_RECONF(net, asoc, chunk);
if (retval)
sctp_chunk_free(chunk);
return retval;
}
static bool sctp_stream_outq_is_empty(struct sctp_stream *stream,
__u16 str_nums, __be16 *str_list)
{
struct sctp_association *asoc;
__u16 i;
asoc = container_of(stream, struct sctp_association, stream);
if (!asoc->outqueue.out_qlen)
return true;
if (!str_nums)
return false;
for (i = 0; i < str_nums; i++) {
__u16 sid = ntohs(str_list[i]);
if (stream->out[sid].ext &&
!list_empty(&stream->out[sid].ext->outq))
return false;
}
return true;
}
int sctp_send_reset_streams(struct sctp_association *asoc,
struct sctp_reset_streams *params)
{
struct sctp_stream *stream = &asoc->stream;
__u16 i, str_nums, *str_list;
struct sctp_chunk *chunk;
int retval = -EINVAL;
__be16 *nstr_list;
bool out, in;
if (!asoc->peer.reconf_capable ||
!(asoc->strreset_enable & SCTP_ENABLE_RESET_STREAM_REQ)) {
retval = -ENOPROTOOPT;
goto out;
}
if (asoc->strreset_outstanding) {
retval = -EINPROGRESS;
goto out;
}
out = params->srs_flags & SCTP_STREAM_RESET_OUTGOING;
in = params->srs_flags & SCTP_STREAM_RESET_INCOMING;
if (!out && !in)
goto out;
str_nums = params->srs_number_streams;
str_list = params->srs_stream_list;
if (str_nums) {
int param_len = 0;
if (out) {
for (i = 0; i < str_nums; i++)
if (str_list[i] >= stream->outcnt)
goto out;
param_len = str_nums * sizeof(__u16) +
sizeof(struct sctp_strreset_outreq);
}
if (in) {
for (i = 0; i < str_nums; i++)
if (str_list[i] >= stream->incnt)
goto out;
param_len += str_nums * sizeof(__u16) +
sizeof(struct sctp_strreset_inreq);
}
if (param_len > SCTP_MAX_CHUNK_LEN -
sizeof(struct sctp_reconf_chunk))
goto out;
}
nstr_list = kcalloc(str_nums, sizeof(__be16), GFP_KERNEL);
if (!nstr_list) {
retval = -ENOMEM;
goto out;
}
for (i = 0; i < str_nums; i++)
nstr_list[i] = htons(str_list[i]);
if (out && !sctp_stream_outq_is_empty(stream, str_nums, nstr_list)) {
retval = -EAGAIN;
goto out;
}
chunk = sctp_make_strreset_req(asoc, str_nums, nstr_list, out, in);
kfree(nstr_list);
if (!chunk) {
retval = -ENOMEM;
goto out;
}
if (out) {
if (str_nums)
for (i = 0; i < str_nums; i++)
stream->out[str_list[i]].state =
SCTP_STREAM_CLOSED;
else
for (i = 0; i < stream->outcnt; i++)
stream->out[i].state = SCTP_STREAM_CLOSED;
}
asoc->strreset_chunk = chunk;
sctp_chunk_hold(asoc->strreset_chunk);
retval = sctp_send_reconf(asoc, chunk);
if (retval) {
sctp_chunk_put(asoc->strreset_chunk);
asoc->strreset_chunk = NULL;
if (!out)
goto out;
if (str_nums)
for (i = 0; i < str_nums; i++)
stream->out[str_list[i]].state =
SCTP_STREAM_OPEN;
else
for (i = 0; i < stream->outcnt; i++)
stream->out[i].state = SCTP_STREAM_OPEN;
goto out;
}
asoc->strreset_outstanding = out + in;
out:
return retval;
}
int sctp_send_reset_assoc(struct sctp_association *asoc)
{
struct sctp_stream *stream = &asoc->stream;
struct sctp_chunk *chunk = NULL;
int retval;
__u16 i;
if (!asoc->peer.reconf_capable ||
!(asoc->strreset_enable & SCTP_ENABLE_RESET_ASSOC_REQ))
return -ENOPROTOOPT;
if (asoc->strreset_outstanding)
return -EINPROGRESS;
if (!sctp_outq_is_empty(&asoc->outqueue))
return -EAGAIN;
chunk = sctp_make_strreset_tsnreq(asoc);
if (!chunk)
return -ENOMEM;
/* Block further xmit of data until this request is completed */
for (i = 0; i < stream->outcnt; i++)
stream->out[i].state = SCTP_STREAM_CLOSED;
asoc->strreset_chunk = chunk;
sctp_chunk_hold(asoc->strreset_chunk);
retval = sctp_send_reconf(asoc, chunk);
if (retval) {
sctp_chunk_put(asoc->strreset_chunk);
asoc->strreset_chunk = NULL;
for (i = 0; i < stream->outcnt; i++)
stream->out[i].state = SCTP_STREAM_OPEN;
return retval;
}
asoc->strreset_outstanding = 1;
return 0;
}
int sctp_send_add_streams(struct sctp_association *asoc,
struct sctp_add_streams *params)
{
struct sctp_stream *stream = &asoc->stream;
struct sctp_chunk *chunk = NULL;
int retval;
__u32 outcnt, incnt;
__u16 out, in;
if (!asoc->peer.reconf_capable ||
!(asoc->strreset_enable & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
retval = -ENOPROTOOPT;
goto out;
}
if (asoc->strreset_outstanding) {
retval = -EINPROGRESS;
goto out;
}
out = params->sas_outstrms;
in = params->sas_instrms;
outcnt = stream->outcnt + out;
incnt = stream->incnt + in;
if (outcnt > SCTP_MAX_STREAM || incnt > SCTP_MAX_STREAM ||
(!out && !in)) {
retval = -EINVAL;
goto out;
}
if (out) {
retval = sctp_stream_alloc_out(stream, outcnt, GFP_KERNEL);
if (retval)
goto out;
}
chunk = sctp_make_strreset_addstrm(asoc, out, in);
if (!chunk) {
retval = -ENOMEM;
goto out;
}
asoc->strreset_chunk = chunk;
sctp_chunk_hold(asoc->strreset_chunk);
retval = sctp_send_reconf(asoc, chunk);
if (retval) {
sctp_chunk_put(asoc->strreset_chunk);
asoc->strreset_chunk = NULL;
goto out;
}
stream->incnt = incnt;
stream->outcnt = outcnt;
asoc->strreset_outstanding = !!out + !!in;
out:
return retval;
}
static struct sctp_paramhdr *sctp_chunk_lookup_strreset_param(
struct sctp_association *asoc, __be32 resp_seq,
__be16 type)
{
struct sctp_chunk *chunk = asoc->strreset_chunk;
struct sctp_reconf_chunk *hdr;
union sctp_params param;
if (!chunk)
return NULL;
hdr = (struct sctp_reconf_chunk *)chunk->chunk_hdr;
sctp_walk_params(param, hdr, params) {
/* sctp_strreset_tsnreq is actually the basic structure
* of all stream reconf params, so it's safe to use it
* to access request_seq.
*/
struct sctp_strreset_tsnreq *req = param.v;
if ((!resp_seq || req->request_seq == resp_seq) &&
(!type || type == req->param_hdr.type))
return param.v;
}
return NULL;
}
static void sctp_update_strreset_result(struct sctp_association *asoc,
__u32 result)
{
asoc->strreset_result[1] = asoc->strreset_result[0];
asoc->strreset_result[0] = result;
}
struct sctp_chunk *sctp_process_strreset_outreq(
struct sctp_association *asoc,
union sctp_params param,
struct sctp_ulpevent **evp)
{
struct sctp_strreset_outreq *outreq = param.v;
struct sctp_stream *stream = &asoc->stream;
__u32 result = SCTP_STRRESET_DENIED;
__u16 i, nums, flags = 0;
__be16 *str_p = NULL;
__u32 request_seq;
request_seq = ntohl(outreq->request_seq);
if (ntohl(outreq->send_reset_at_tsn) >
sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map)) {
result = SCTP_STRRESET_IN_PROGRESS;
goto err;
}
if (TSN_lt(asoc->strreset_inseq, request_seq) ||
TSN_lt(request_seq, asoc->strreset_inseq - 2)) {
result = SCTP_STRRESET_ERR_BAD_SEQNO;
goto err;
} else if (TSN_lt(request_seq, asoc->strreset_inseq)) {
i = asoc->strreset_inseq - request_seq - 1;
result = asoc->strreset_result[i];
goto err;
}
asoc->strreset_inseq++;
/* Check strreset_enable after inseq inc, as sender cannot tell
* the peer doesn't enable strreset after receiving response with
* result denied, as well as to keep consistent with bsd.
*/
if (!(asoc->strreset_enable & SCTP_ENABLE_RESET_STREAM_REQ))
goto out;
if (asoc->strreset_chunk) {
if (!sctp_chunk_lookup_strreset_param(
asoc, outreq->response_seq,
SCTP_PARAM_RESET_IN_REQUEST)) {
/* same process with outstanding isn't 0 */
result = SCTP_STRRESET_ERR_IN_PROGRESS;
goto out;
}
asoc->strreset_outstanding--;
asoc->strreset_outseq++;
if (!asoc->strreset_outstanding) {
struct sctp_transport *t;
t = asoc->strreset_chunk->transport;
if (del_timer(&t->reconf_timer))
sctp_transport_put(t);
sctp_chunk_put(asoc->strreset_chunk);
asoc->strreset_chunk = NULL;
}
flags = SCTP_STREAM_RESET_INCOMING_SSN;
}
nums = (ntohs(param.p->length) - sizeof(*outreq)) / sizeof(__u16);
if (nums) {
str_p = outreq->list_of_streams;
for (i = 0; i < nums; i++) {
if (ntohs(str_p[i]) >= stream->incnt) {
result = SCTP_STRRESET_ERR_WRONG_SSN;
goto out;
}
}
for (i = 0; i < nums; i++)
stream->in[ntohs(str_p[i])].ssn = 0;
} else {
for (i = 0; i < stream->incnt; i++)
stream->in[i].ssn = 0;
}
result = SCTP_STRRESET_PERFORMED;
*evp = sctp_ulpevent_make_stream_reset_event(asoc,
flags | SCTP_STREAM_RESET_OUTGOING_SSN, nums, str_p,
GFP_ATOMIC);
out:
sctp_update_strreset_result(asoc, result);
err:
return sctp_make_strreset_resp(asoc, result, request_seq);
}
struct sctp_chunk *sctp_process_strreset_inreq(
struct sctp_association *asoc,
union sctp_params param,
struct sctp_ulpevent **evp)
{
struct sctp_strreset_inreq *inreq = param.v;
struct sctp_stream *stream = &asoc->stream;
__u32 result = SCTP_STRRESET_DENIED;
struct sctp_chunk *chunk = NULL;
__u32 request_seq;
__u16 i, nums;
__be16 *str_p;
request_seq = ntohl(inreq->request_seq);
if (TSN_lt(asoc->strreset_inseq, request_seq) ||
TSN_lt(request_seq, asoc->strreset_inseq - 2)) {
result = SCTP_STRRESET_ERR_BAD_SEQNO;
goto err;
} else if (TSN_lt(request_seq, asoc->strreset_inseq)) {
i = asoc->strreset_inseq - request_seq - 1;
result = asoc->strreset_result[i];
if (result == SCTP_STRRESET_PERFORMED)
return NULL;
goto err;
}
asoc->strreset_inseq++;
if (!(asoc->strreset_enable & SCTP_ENABLE_RESET_STREAM_REQ))
goto out;
if (asoc->strreset_outstanding) {
result = SCTP_STRRESET_ERR_IN_PROGRESS;
goto out;
}
nums = (ntohs(param.p->length) - sizeof(*inreq)) / sizeof(__u16);
str_p = inreq->list_of_streams;
for (i = 0; i < nums; i++) {
if (ntohs(str_p[i]) >= stream->outcnt) {
result = SCTP_STRRESET_ERR_WRONG_SSN;
goto out;
}
}
if (!sctp_stream_outq_is_empty(stream, nums, str_p)) {
result = SCTP_STRRESET_IN_PROGRESS;
asoc->strreset_inseq--;
goto err;
}
chunk = sctp_make_strreset_req(asoc, nums, str_p, 1, 0);
if (!chunk)
goto out;
if (nums)
for (i = 0; i < nums; i++)
stream->out[ntohs(str_p[i])].state =
SCTP_STREAM_CLOSED;
else
for (i = 0; i < stream->outcnt; i++)
stream->out[i].state = SCTP_STREAM_CLOSED;
asoc->strreset_chunk = chunk;
asoc->strreset_outstanding = 1;
sctp_chunk_hold(asoc->strreset_chunk);
result = SCTP_STRRESET_PERFORMED;
*evp = sctp_ulpevent_make_stream_reset_event(asoc,
SCTP_STREAM_RESET_INCOMING_SSN, nums, str_p, GFP_ATOMIC);
out:
sctp_update_strreset_result(asoc, result);
err:
if (!chunk)
chunk = sctp_make_strreset_resp(asoc, result, request_seq);
return chunk;
}
struct sctp_chunk *sctp_process_strreset_tsnreq(
struct sctp_association *asoc,
union sctp_params param,
struct sctp_ulpevent **evp)
{
__u32 init_tsn = 0, next_tsn = 0, max_tsn_seen;
struct sctp_strreset_tsnreq *tsnreq = param.v;
struct sctp_stream *stream = &asoc->stream;
__u32 result = SCTP_STRRESET_DENIED;
__u32 request_seq;
__u16 i;
request_seq = ntohl(tsnreq->request_seq);
if (TSN_lt(asoc->strreset_inseq, request_seq) ||
TSN_lt(request_seq, asoc->strreset_inseq - 2)) {
result = SCTP_STRRESET_ERR_BAD_SEQNO;
goto err;
} else if (TSN_lt(request_seq, asoc->strreset_inseq)) {
i = asoc->strreset_inseq - request_seq - 1;
result = asoc->strreset_result[i];
if (result == SCTP_STRRESET_PERFORMED) {
next_tsn = asoc->next_tsn;
init_tsn =
sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map) + 1;
}
goto err;
}
if (!sctp_outq_is_empty(&asoc->outqueue)) {
result = SCTP_STRRESET_IN_PROGRESS;
goto err;
}
asoc->strreset_inseq++;
if (!(asoc->strreset_enable & SCTP_ENABLE_RESET_ASSOC_REQ))
goto out;
if (asoc->strreset_outstanding) {
result = SCTP_STRRESET_ERR_IN_PROGRESS;
goto out;
}
/* G4: The same processing as though a FWD-TSN chunk (as defined in
* [RFC3758]) with all streams affected and a new cumulative TSN
* ACK of the Receiver's Next TSN minus 1 were received MUST be
* 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);
/* 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
* value SHOULD be the smallest TSN not acknowledged by the
* receiver of the request plus 2^31.
*/
init_tsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map) + (1 << 31);
sctp_tsnmap_init(&asoc->peer.tsn_map, SCTP_TSN_MAP_INITIAL,
init_tsn, GFP_ATOMIC);
/* G3: The same processing as though a SACK chunk with no gap report
* and a cumulative TSN ACK of the Sender's Next TSN minus 1 were
* received MUST be performed.
*/
sctp_outq_free(&asoc->outqueue);
/* G2: Compute an appropriate value for the local endpoint's next TSN,
* i.e., the next TSN assigned by the receiver of the SSN/TSN reset
* chunk. The value SHOULD be the highest TSN sent by the receiver
* of the request plus 1.
*/
next_tsn = asoc->next_tsn;
asoc->ctsn_ack_point = next_tsn - 1;
asoc->adv_peer_ack_point = asoc->ctsn_ack_point;
/* G5: The next expected and outgoing SSNs MUST be reset to 0 for all
* incoming and outgoing streams.
*/
for (i = 0; i < stream->outcnt; i++)
stream->out[i].ssn = 0;
for (i = 0; i < stream->incnt; i++)
stream->in[i].ssn = 0;
result = SCTP_STRRESET_PERFORMED;
*evp = sctp_ulpevent_make_assoc_reset_event(asoc, 0, init_tsn,
next_tsn, GFP_ATOMIC);
out:
sctp_update_strreset_result(asoc, result);
err:
return sctp_make_strreset_tsnresp(asoc, result, request_seq,
next_tsn, init_tsn);
}
struct sctp_chunk *sctp_process_strreset_addstrm_out(
struct sctp_association *asoc,
union sctp_params param,
struct sctp_ulpevent **evp)
{
struct sctp_strreset_addstrm *addstrm = param.v;
struct sctp_stream *stream = &asoc->stream;
__u32 result = SCTP_STRRESET_DENIED;
__u32 request_seq, incnt;
__u16 in, i;
request_seq = ntohl(addstrm->request_seq);
if (TSN_lt(asoc->strreset_inseq, request_seq) ||
TSN_lt(request_seq, asoc->strreset_inseq - 2)) {
result = SCTP_STRRESET_ERR_BAD_SEQNO;
goto err;
} else if (TSN_lt(request_seq, asoc->strreset_inseq)) {
i = asoc->strreset_inseq - request_seq - 1;
result = asoc->strreset_result[i];
goto err;
}
asoc->strreset_inseq++;
if (!(asoc->strreset_enable & SCTP_ENABLE_CHANGE_ASSOC_REQ))
goto out;
if (asoc->strreset_chunk) {
if (!sctp_chunk_lookup_strreset_param(
asoc, 0, SCTP_PARAM_RESET_ADD_IN_STREAMS)) {
/* same process with outstanding isn't 0 */
result = SCTP_STRRESET_ERR_IN_PROGRESS;
goto out;
}
asoc->strreset_outstanding--;
asoc->strreset_outseq++;
if (!asoc->strreset_outstanding) {
struct sctp_transport *t;
t = asoc->strreset_chunk->transport;
if (del_timer(&t->reconf_timer))
sctp_transport_put(t);
sctp_chunk_put(asoc->strreset_chunk);
asoc->strreset_chunk = NULL;
}
}
in = ntohs(addstrm->number_of_streams);
incnt = stream->incnt + in;
if (!in || incnt > SCTP_MAX_STREAM)
goto out;
if (sctp_stream_alloc_in(stream, incnt, GFP_ATOMIC))
goto out;
stream->incnt = incnt;
result = SCTP_STRRESET_PERFORMED;
*evp = sctp_ulpevent_make_stream_change_event(asoc,
0, ntohs(addstrm->number_of_streams), 0, GFP_ATOMIC);
out:
sctp_update_strreset_result(asoc, result);
err:
return sctp_make_strreset_resp(asoc, result, request_seq);
}
struct sctp_chunk *sctp_process_strreset_addstrm_in(
struct sctp_association *asoc,
union sctp_params param,
struct sctp_ulpevent **evp)
{
struct sctp_strreset_addstrm *addstrm = param.v;
struct sctp_stream *stream = &asoc->stream;
__u32 result = SCTP_STRRESET_DENIED;
struct sctp_chunk *chunk = NULL;
__u32 request_seq, outcnt;
__u16 out, i;
int ret;
request_seq = ntohl(addstrm->request_seq);
if (TSN_lt(asoc->strreset_inseq, request_seq) ||
TSN_lt(request_seq, asoc->strreset_inseq - 2)) {
result = SCTP_STRRESET_ERR_BAD_SEQNO;
goto err;
} else if (TSN_lt(request_seq, asoc->strreset_inseq)) {
i = asoc->strreset_inseq - request_seq - 1;
result = asoc->strreset_result[i];
if (result == SCTP_STRRESET_PERFORMED)
return NULL;
goto err;
}
asoc->strreset_inseq++;
if (!(asoc->strreset_enable & SCTP_ENABLE_CHANGE_ASSOC_REQ))
goto out;
if (asoc->strreset_outstanding) {
result = SCTP_STRRESET_ERR_IN_PROGRESS;
goto out;
}
out = ntohs(addstrm->number_of_streams);
outcnt = stream->outcnt + out;
if (!out || outcnt > SCTP_MAX_STREAM)
goto out;
ret = sctp_stream_alloc_out(stream, outcnt, GFP_ATOMIC);
if (ret)
goto out;
chunk = sctp_make_strreset_addstrm(asoc, out, 0);
if (!chunk)
goto out;
asoc->strreset_chunk = chunk;
asoc->strreset_outstanding = 1;
sctp_chunk_hold(asoc->strreset_chunk);
stream->outcnt = outcnt;
result = SCTP_STRRESET_PERFORMED;
*evp = sctp_ulpevent_make_stream_change_event(asoc,
0, 0, ntohs(addstrm->number_of_streams), GFP_ATOMIC);
out:
sctp_update_strreset_result(asoc, result);
err:
if (!chunk)
chunk = sctp_make_strreset_resp(asoc, result, request_seq);
return chunk;
}
struct sctp_chunk *sctp_process_strreset_resp(
struct sctp_association *asoc,
union sctp_params param,
struct sctp_ulpevent **evp)
{
struct sctp_stream *stream = &asoc->stream;
struct sctp_strreset_resp *resp = param.v;
struct sctp_transport *t;
__u16 i, nums, flags = 0;
struct sctp_paramhdr *req;
__u32 result;
req = sctp_chunk_lookup_strreset_param(asoc, resp->response_seq, 0);
if (!req)
return NULL;
result = ntohl(resp->result);
if (result != SCTP_STRRESET_PERFORMED) {
/* if in progress, do nothing but retransmit */
if (result == SCTP_STRRESET_IN_PROGRESS)
return NULL;
else if (result == SCTP_STRRESET_DENIED)
flags = SCTP_STREAM_RESET_DENIED;
else
flags = SCTP_STREAM_RESET_FAILED;
}
if (req->type == SCTP_PARAM_RESET_OUT_REQUEST) {
struct sctp_strreset_outreq *outreq;
__be16 *str_p;
outreq = (struct sctp_strreset_outreq *)req;
str_p = outreq->list_of_streams;
nums = (ntohs(outreq->param_hdr.length) - sizeof(*outreq)) /
sizeof(__u16);
if (result == SCTP_STRRESET_PERFORMED) {
if (nums) {
for (i = 0; i < nums; i++)
stream->out[ntohs(str_p[i])].ssn = 0;
} else {
for (i = 0; i < stream->outcnt; i++)
stream->out[i].ssn = 0;
}
flags = SCTP_STREAM_RESET_OUTGOING_SSN;
}
for (i = 0; i < stream->outcnt; i++)
stream->out[i].state = SCTP_STREAM_OPEN;
*evp = sctp_ulpevent_make_stream_reset_event(asoc, flags,
nums, str_p, GFP_ATOMIC);
} else if (req->type == SCTP_PARAM_RESET_IN_REQUEST) {
struct sctp_strreset_inreq *inreq;
__be16 *str_p;
/* if the result is performed, it's impossible for inreq */
if (result == SCTP_STRRESET_PERFORMED)
return NULL;
inreq = (struct sctp_strreset_inreq *)req;
str_p = inreq->list_of_streams;
nums = (ntohs(inreq->param_hdr.length) - sizeof(*inreq)) /
sizeof(__u16);
*evp = sctp_ulpevent_make_stream_reset_event(asoc, flags,
nums, str_p, GFP_ATOMIC);
} else if (req->type == SCTP_PARAM_RESET_TSN_REQUEST) {
struct sctp_strreset_resptsn *resptsn;
__u32 stsn, rtsn;
/* check for resptsn, as sctp_verify_reconf didn't do it*/
if (ntohs(param.p->length) != sizeof(*resptsn))
return NULL;
resptsn = (struct sctp_strreset_resptsn *)resp;
stsn = ntohl(resptsn->senders_next_tsn);
rtsn = ntohl(resptsn->receivers_next_tsn);
if (result == SCTP_STRRESET_PERFORMED) {
__u32 mtsn = sctp_tsnmap_get_max_tsn_seen(
&asoc->peer.tsn_map);
LIST_HEAD(temp);
sctp_ulpq_reasm_flushtsn(&asoc->ulpq, mtsn);
sctp_ulpq_abort_pd(&asoc->ulpq, GFP_ATOMIC);
sctp_tsnmap_init(&asoc->peer.tsn_map,
SCTP_TSN_MAP_INITIAL,
stsn, GFP_ATOMIC);
/* Clean up sacked and abandoned queues only. As the
* out_chunk_list may not be empty, splice it to temp,
* then get it back after sctp_outq_free is done.
*/
list_splice_init(&asoc->outqueue.out_chunk_list, &temp);
sctp_outq_free(&asoc->outqueue);
list_splice_init(&temp, &asoc->outqueue.out_chunk_list);
asoc->next_tsn = rtsn;
asoc->ctsn_ack_point = asoc->next_tsn - 1;
asoc->adv_peer_ack_point = asoc->ctsn_ack_point;
for (i = 0; i < stream->outcnt; i++)
stream->out[i].ssn = 0;
for (i = 0; i < stream->incnt; i++)
stream->in[i].ssn = 0;
}
for (i = 0; i < stream->outcnt; i++)
stream->out[i].state = SCTP_STREAM_OPEN;
*evp = sctp_ulpevent_make_assoc_reset_event(asoc, flags,
stsn, rtsn, GFP_ATOMIC);
} else if (req->type == SCTP_PARAM_RESET_ADD_OUT_STREAMS) {
struct sctp_strreset_addstrm *addstrm;
__u16 number;
addstrm = (struct sctp_strreset_addstrm *)req;
nums = ntohs(addstrm->number_of_streams);
number = stream->outcnt - nums;
if (result == SCTP_STRRESET_PERFORMED)
for (i = number; i < stream->outcnt; i++)
stream->out[i].state = SCTP_STREAM_OPEN;
else
stream->outcnt = number;
*evp = sctp_ulpevent_make_stream_change_event(asoc, flags,
0, nums, GFP_ATOMIC);
} else if (req->type == SCTP_PARAM_RESET_ADD_IN_STREAMS) {
struct sctp_strreset_addstrm *addstrm;
/* if the result is performed, it's impossible for addstrm in
* request.
*/
if (result == SCTP_STRRESET_PERFORMED)
return NULL;
addstrm = (struct sctp_strreset_addstrm *)req;
nums = ntohs(addstrm->number_of_streams);
*evp = sctp_ulpevent_make_stream_change_event(asoc, flags,
nums, 0, GFP_ATOMIC);
}
asoc->strreset_outstanding--;
asoc->strreset_outseq++;
/* remove everything for this reconf request */
if (!asoc->strreset_outstanding) {
t = asoc->strreset_chunk->transport;
if (del_timer(&t->reconf_timer))
sctp_transport_put(t);
sctp_chunk_put(asoc->strreset_chunk);
asoc->strreset_chunk = NULL;
}
return NULL;
}
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