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sctp: add support for generating stream reconf resp chunk 

This patch is to define Re-configuration Response Parameter described
in rfc6525 section 4.4. As optional fields are only for SSN/TSN Reset
Request Parameter, it uses another function to make that.

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 12:45:37 +08:00 committed by David S. Miller
parent 61845d2072
commit bd4b9f8b4a
3 changed files with 105 additions and 0 deletions
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24
include/linux/sctp.h
View File

@ -749,4 +749,28 @@ struct sctp_strreset_addstrm {
__u16 reserved;
};
enum {
SCTP_STRRESET_NOTHING_TO_DO = 0x00,
SCTP_STRRESET_PERFORMED = 0x01,
SCTP_STRRESET_DENIED = 0x02,
SCTP_STRRESET_ERR_WRONG_SSN = 0x03,
SCTP_STRRESET_ERR_IN_PROGRESS = 0x04,
SCTP_STRRESET_ERR_BAD_SEQNO = 0x05,
SCTP_STRRESET_IN_PROGRESS = 0x06,
};
struct sctp_strreset_resp {
sctp_paramhdr_t param_hdr;
__u32 response_seq;
__u32 result;
};
struct sctp_strreset_resptsn {
sctp_paramhdr_t param_hdr;
__u32 response_seq;
__u32 result;
__u32 senders_next_tsn;
__u32 receivers_next_tsn;
};
#endif /* __LINUX_SCTP_H__ */

7
include/net/sctp/sm.h
View File

@ -270,6 +270,13 @@ struct sctp_chunk *sctp_make_strreset_tsnreq(
struct sctp_chunk *sctp_make_strreset_addstrm(
const struct sctp_association *asoc,
__u16 out, __u16 in);
struct sctp_chunk *sctp_make_strreset_resp(
const struct sctp_association *asoc,
__u32 result, __u32 sn);
struct sctp_chunk *sctp_make_strreset_tsnresp(
struct sctp_association *asoc,
__u32 result, __u32 sn,
__u32 sender_tsn, __u32 receiver_tsn);
void sctp_chunk_assign_tsn(struct sctp_chunk *);
void sctp_chunk_assign_ssn(struct sctp_chunk *);

74
net/sctp/sm_make_chunk.c
View File

@ -3733,3 +3733,77 @@ struct sctp_chunk *sctp_make_strreset_addstrm(
return retval;
}
/* RE-CONFIG 4.4 (RESP)
* 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 = 16 | Parameter Length |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Re-configuration Response Sequence Number |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Result |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
struct sctp_chunk *sctp_make_strreset_resp(
const struct sctp_association *asoc,
__u32 result, __u32 sn)
{
struct sctp_strreset_resp resp;
__u16 length = sizeof(resp);
struct sctp_chunk *retval;
retval = sctp_make_reconf(asoc, length);
if (!retval)
return NULL;
resp.param_hdr.type = SCTP_PARAM_RESET_RESPONSE;
resp.param_hdr.length = htons(length);
resp.response_seq = htonl(sn);
resp.result = htonl(result);
sctp_addto_chunk(retval, sizeof(resp), &resp);
return retval;
}
/* RE-CONFIG 4.4 OPTIONAL (TSNRESP)
* 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 = 16 | Parameter Length |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Re-configuration Response Sequence Number |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Result |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Sender's Next TSN (optional) |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Receiver's Next TSN (optional) |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
struct sctp_chunk *sctp_make_strreset_tsnresp(
struct sctp_association *asoc,
__u32 result, __u32 sn,
__u32 sender_tsn, __u32 receiver_tsn)
{
struct sctp_strreset_resptsn tsnresp;
__u16 length = sizeof(tsnresp);
struct sctp_chunk *retval;
retval = sctp_make_reconf(asoc, length);
if (!retval)
return NULL;
tsnresp.param_hdr.type = SCTP_PARAM_RESET_RESPONSE;
tsnresp.param_hdr.length = htons(length);
tsnresp.response_seq = htonl(sn);
tsnresp.result = htonl(result);
tsnresp.senders_next_tsn = htonl(sender_tsn);
tsnresp.receivers_next_tsn = htonl(receiver_tsn);
sctp_addto_chunk(retval, sizeof(tsnresp), &tsnresp);
return retval;
}