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sctp: add the error cause for new encapsulation port restart 

This patch is to add the function to make the abort chunk with
the error cause for new encapsulation port restart, defined
on Section 4.4 in draft-tuexen-tsvwg-sctp-udp-encaps-cons-03.

v1->v2:
  - no change.
v2->v3:
  - no need to call htons() when setting nep.cur_port/new_port.

Signed-off-by: Xin Long <lucien.xin@gmail.com>
Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Xin Long 2020-10-29 15:05:08 +08:00 committed by Jakub Kicinski
parent 259db53ba5
commit e38d86b354
3 changed files with 43 additions and 0 deletions
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20
include/linux/sctp.h
View File

@ -482,11 +482,13 @@ enum sctp_error {
* 11 Restart of an association with new addresses
* 12 User Initiated Abort
* 13 Protocol Violation
* 14 Restart of an Association with New Encapsulation Port
*/
SCTP_ERROR_RESTART = cpu_to_be16(0x0b),
SCTP_ERROR_USER_ABORT = cpu_to_be16(0x0c),
SCTP_ERROR_PROTO_VIOLATION = cpu_to_be16(0x0d),
SCTP_ERROR_NEW_ENCAP_PORT = cpu_to_be16(0x0e),
/* ADDIP Section 3.3 New Error Causes
*
@ -793,4 +795,22 @@ enum {
SCTP_FLOWLABEL_VAL_MASK = 0xfffff
};
/* UDP Encapsulation
* draft-tuexen-tsvwg-sctp-udp-encaps-cons-03.html#section-4-4
*
* The error cause indicating an "Restart of an Association with
* New Encapsulation Port"
*
* 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
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Cause Code = 14 | Cause Length = 8 |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Current Encapsulation Port | New Encapsulation Port |
* +-------------------------------+-------------------------------+
*/
struct sctp_new_encap_port_hdr {
__be16 cur_port;
__be16 new_port;
};
#endif /* __LINUX_SCTP_H__ */

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

@ -221,6 +221,9 @@ struct sctp_chunk *sctp_make_violation_paramlen(
struct sctp_chunk *sctp_make_violation_max_retrans(
const struct sctp_association *asoc,
const struct sctp_chunk *chunk);
struct sctp_chunk *sctp_make_new_encap_port(
const struct sctp_association *asoc,
const struct sctp_chunk *chunk);
struct sctp_chunk *sctp_make_heartbeat(const struct sctp_association *asoc,
const struct sctp_transport *transport);
struct sctp_chunk *sctp_make_heartbeat_ack(const struct sctp_association *asoc,

20
net/sctp/sm_make_chunk.c
View File

@ -1142,6 +1142,26 @@ nodata:
return retval;
}
struct sctp_chunk *sctp_make_new_encap_port(const struct sctp_association *asoc,
const struct sctp_chunk *chunk)
{
struct sctp_new_encap_port_hdr nep;
struct sctp_chunk *retval;
retval = sctp_make_abort(asoc, chunk,
sizeof(struct sctp_errhdr) + sizeof(nep));
if (!retval)
goto nodata;
sctp_init_cause(retval, SCTP_ERROR_NEW_ENCAP_PORT, sizeof(nep));
nep.cur_port = SCTP_INPUT_CB(chunk->skb)->encap_port;
nep.new_port = chunk->transport->encap_port;
sctp_addto_chunk(retval, sizeof(nep), &nep);
nodata:
return retval;
}
/* Make a HEARTBEAT chunk. */
struct sctp_chunk *sctp_make_heartbeat(const struct sctp_association *asoc,
const struct sctp_transport *transport)