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sctp: add support for generating stream reconf add incoming/outgoing streams request chunk 

This patch is to define Add Incoming/Outgoing Streams Request
Parameter described in rfc6525 section 4.5 and 4.6. They can
be in one same chunk trunk as rfc6525 section 3.1-7 describes,
so make them in one function.

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>
This commit is contained in:
Xin Long 2017-02-09 01:18:19 +08:00 committed by David S. Miller
parent a92ce1a42d
commit 78098117f8
3 changed files with 56 additions and 0 deletions
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7
include/linux/sctp.h
View File

@ -742,4 +742,11 @@ struct sctp_strreset_tsnreq {
__u32 request_seq;
};
struct sctp_strreset_addstrm {
sctp_paramhdr_t param_hdr;
__u32 request_seq;
__u16 number_of_streams;
__u16 reserved;
};
#endif /* __LINUX_SCTP_H__ */

3
include/net/sctp/sm.h
View File

@ -267,6 +267,9 @@ struct sctp_chunk *sctp_make_strreset_req(
bool out, bool in);
struct sctp_chunk *sctp_make_strreset_tsnreq(
const struct sctp_association *asoc);
struct sctp_chunk *sctp_make_strreset_addstrm(
const struct sctp_association *asoc,
__u16 out, __u16 in);
void sctp_chunk_assign_tsn(struct sctp_chunk *);
void sctp_chunk_assign_ssn(struct sctp_chunk *);

46
net/sctp/sm_make_chunk.c
View File

@ -3687,3 +3687,49 @@ struct sctp_chunk *sctp_make_strreset_tsnreq(
return retval;
}
/* RE-CONFIG 4.5/4.6 (ADD STREAM)
* 0 1 2 3
* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Parameter Type = 17 | Parameter Length = 12 |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Re-configuration Request Sequence Number |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Number of new streams | Reserved |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
struct sctp_chunk *sctp_make_strreset_addstrm(
const struct sctp_association *asoc,
__u16 out, __u16 in)
{
struct sctp_strreset_addstrm addstrm;
__u16 size = sizeof(addstrm);
struct sctp_chunk *retval;
retval = sctp_make_reconf(asoc, (!!out + !!in) * size);
if (!retval)
return NULL;
if (out) {
addstrm.param_hdr.type = SCTP_PARAM_RESET_ADD_OUT_STREAMS;
addstrm.param_hdr.length = htons(size);
addstrm.number_of_streams = htons(out);
addstrm.request_seq = htonl(asoc->strreset_outseq);
addstrm.reserved = 0;
sctp_addto_chunk(retval, size, &addstrm);
}
if (in) {
addstrm.param_hdr.type = SCTP_PARAM_RESET_ADD_IN_STREAMS;
addstrm.param_hdr.length = htons(size);
addstrm.number_of_streams = htons(in);
addstrm.request_seq = htonl(asoc->strreset_outseq + !!out);
addstrm.reserved = 0;
sctp_addto_chunk(retval, size, &addstrm);
}
return retval;
}