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sctp: add the error cause for new encapsulation port restart

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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)