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linux/net/sctp/stream.c
Xin Long 107e242569 sctp: update mid instead of ssn when doing stream and asoc reset 
When using idata and doing stream and asoc reset, setting ssn with
0 could only clear the 1st 16 bits of mid.

So to make this work for both data and idata, it sets mid with 0
instead of ssn, and also mid_uo for unordered idata also need to
be cleared, as said in section 2.3.2 of RFC8260.

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>
2017-12-15 13:52:22 -05:00

1112 lines
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/* 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, (__force __u32)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:
sctp_stream_interleave_init(stream);
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].mid = 0;
stream->out[i].mid_uo = 0;
}
for (i = 0; i < stream->incnt; i++)
stream->in[i].mid = 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])].mid = 0;
} else {
for (i = 0; i < stream->incnt; i++)
stream->in[i].mid = 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->ctsn_ack_point + 1;
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);
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
* 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].mid = 0;
stream->out[i].mid_uo = 0;
}
for (i = 0; i < stream->incnt; i++)
stream->in[i].mid = 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])].mid = 0;
stream->out[ntohs(str_p[i])].mid_uo = 0;
}
} else {
for (i = 0; i < stream->outcnt; i++) {
stream->out[i].mid = 0;
stream->out[i].mid_uo = 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);
asoc->stream.si->report_ftsn(&asoc->ulpq, mtsn);
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].mid = 0;
stream->out[i].mid_uo = 0;
}
for (i = 0; i < stream->incnt; i++)
stream->in[i].mid = 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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