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sctp: implement sender-side procedures for SSN/TSN Reset Request Parameter

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This patch is to implement Sender-Side Procedures for the SSN/TSN
Reset Request Parameter descibed in rfc6525 section 5.1.4.

It is also to add sockopt SCTP_RESET_ASSOC in rfc6525 section 6.3.3
for users.

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 01:18:18 +08:00 committed by David S. Miller
parent c56480a1e9
commit a92ce1a42d
4 changed files with 71 additions and 0 deletions
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1
include/net/sctp/sctp.h
View File

@ -198,6 +198,7 @@ int sctp_offload_init(void);
*/
int sctp_send_reset_streams(struct sctp_association *asoc,
struct sctp_reset_streams *params);
int sctp_send_reset_assoc(struct sctp_association *asoc);
/*
* Module global variables

1
include/uapi/linux/sctp.h
View File

@ -117,6 +117,7 @@ typedef __s32 sctp_assoc_t;
#define SCTP_PR_ASSOC_STATUS 115
#define SCTP_ENABLE_STREAM_RESET 118
#define SCTP_RESET_STREAMS 119
#define SCTP_RESET_ASSOC 120
/* PR-SCTP policies */
#define SCTP_PR_SCTP_NONE 0x0000

29
net/sctp/socket.c
View File

@ -3818,6 +3818,32 @@ out:
return retval;
}
static int sctp_setsockopt_reset_assoc(struct sock *sk,
char __user *optval,
unsigned int optlen)
{
struct sctp_association *asoc;
sctp_assoc_t associd;
int retval = -EINVAL;
if (optlen != sizeof(associd))
goto out;
if (copy_from_user(&associd, optval, optlen)) {
retval = -EFAULT;
goto out;
}
asoc = sctp_id2assoc(sk, associd);
if (!asoc)
goto out;
retval = sctp_send_reset_assoc(asoc);
out:
return retval;
}
/* API 6.2 setsockopt(), getsockopt()
*
* Applications use setsockopt() and getsockopt() to set or retrieve
@ -3990,6 +4016,9 @@ static int sctp_setsockopt(struct sock *sk, int level, int optname,
case SCTP_RESET_STREAMS:
retval = sctp_setsockopt_reset_streams(sk, optval, optlen);
break;
case SCTP_RESET_ASSOC:
retval = sctp_setsockopt_reset_assoc(sk, optval, optlen);
break;
default:
retval = -ENOPROTOOPT;
break;

40
net/sctp/stream.c
View File

@ -177,3 +177,43 @@ int sctp_send_reset_streams(struct sctp_association *asoc,
out:
return retval;
}
int sctp_send_reset_assoc(struct sctp_association *asoc)
{
struct sctp_chunk *chunk = NULL;
int retval;
__u16 i;
if (!asoc->peer.reconf_capable ||
!(asoc->strreset_enable & SCTP_ENABLE_RESET_ASSOC_REQ))
return -ENOPROTOOPT;
if (asoc->strreset_outstanding)
return -EINPROGRESS;
chunk = sctp_make_strreset_tsnreq(asoc);
if (!chunk)
return -ENOMEM;
/* Block further xmit of data until this request is completed */
for (i = 0; i < asoc->stream->outcnt; i++)
asoc->stream->out[i].state = SCTP_STREAM_CLOSED;
asoc->strreset_chunk = chunk;
sctp_chunk_hold(asoc->strreset_chunk);
retval = sctp_send_reconf(asoc, chunk);
if (retval) {
sctp_chunk_put(asoc->strreset_chunk);
asoc->strreset_chunk = NULL;
for (i = 0; i < asoc->stream->outcnt; i++)
asoc->stream->out[i].state = SCTP_STREAM_OPEN;
return retval;
}
asoc->strreset_outstanding = 1;
return 0;
}