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sctp: implement receiver-side procedures for the Incoming SSN Reset Request Parameter

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This patch is to implement Receiver-Side Procedures for the Incoming
SSN Reset Request Parameter described in rfc6525 section 5.2.3.

It's also to move str_list endian conversion out of sctp_make_strreset_req,
so that sctp_make_strreset_req can be used more conveniently to process
inreq.

Signed-off-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Xin Long 2017-02-17 12:45:40 +08:00 committed by David S. Miller
parent 8105447645
commit 16e1a91965
3 changed files with 75 additions and 7 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

4
include/net/sctp/sm.h
View file

@ -285,6 +285,10 @@ struct sctp_chunk *sctp_process_strreset_outreq(
struct sctp_association *asoc,
union sctp_params param,
struct sctp_ulpevent **evp);
struct sctp_chunk *sctp_process_strreset_inreq(
struct sctp_association *asoc,
union sctp_params param,
struct sctp_ulpevent **evp);
/* Prototypes for statetable processing. */

8
net/sctp/sm_make_chunk.c
View file

@ -3617,7 +3617,7 @@ struct sctp_chunk *sctp_make_strreset_req(
__u16 stream_len = stream_num * 2;
struct sctp_strreset_inreq inreq;
struct sctp_chunk *retval;
__u16 outlen, inlen, i;
__u16 outlen, inlen;
outlen = (sizeof(outreq) + stream_len) * out;
inlen = (sizeof(inreq) + stream_len) * in;
@ -3626,9 +3626,6 @@ struct sctp_chunk *sctp_make_strreset_req(
if (!retval)
return NULL;
for (i = 0; i < stream_num; i++)
stream_list[i] = htons(stream_list[i]);
if (outlen) {
outreq.param_hdr.type = SCTP_PARAM_RESET_OUT_REQUEST;
outreq.param_hdr.length = htons(outlen);
@ -3653,9 +3650,6 @@ struct sctp_chunk *sctp_make_strreset_req(
sctp_addto_chunk(retval, stream_len, stream_list);
}
for (i = 0; i < stream_num; i++)
stream_list[i] = ntohs(stream_list[i]);
return retval;
}

70
net/sctp/stream.c
View file

@ -135,7 +135,14 @@ int sctp_send_reset_streams(struct sctp_association *asoc,
if (str_list[i] >= stream->incnt)
goto out;
for (i = 0; i < str_nums; i++)
str_list[i] = htons(str_list[i]);
chunk = sctp_make_strreset_req(asoc, str_nums, str_list, out, in);
for (i = 0; i < str_nums; i++)
str_list[i] = ntohs(str_list[i]);
if (!chunk) {
retval = -ENOMEM;
goto out;
@ -407,3 +414,66 @@ struct sctp_chunk *sctp_process_strreset_outreq(
out:
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;
__u16 i, nums, *str_p;
__u32 request_seq;
request_seq = ntohl(inreq->request_seq);
if (request_seq > asoc->strreset_inseq) {
result = SCTP_STRRESET_ERR_BAD_SEQNO;
goto out;
} else if (request_seq == asoc->strreset_inseq) {
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)) / 2;
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;
}
}
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);
*evp = sctp_ulpevent_make_stream_reset_event(asoc,
SCTP_STREAM_RESET_INCOMING_SSN, nums, str_p, GFP_ATOMIC);
out:
if (!chunk)
chunk = sctp_make_strreset_resp(asoc, result, request_seq);
return chunk;
}