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Commit a92ce1a4 authored by Xin Long's avatar Xin Long Committed by David S. Miller
Browse files

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



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: default avatarXin Long <lucien.xin@gmail.com>
Acked-by: default avatarMarcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent c56480a1

include/net/sctp/sctp.h

+1 −0
Original line number Diff line number Diff line
@@ -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

include/uapi/linux/sctp.h

+1 −0
Original line number Diff line number Diff line
@@ -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

net/sctp/socket.c

+29 −0
Original line number Diff line number Diff line
@@ -3818,6 +3818,32 @@ static int sctp_setsockopt_reset_streams(struct sock *sk, 
	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;

net/sctp/stream.c

+40 −0
Original line number Diff line number Diff line
@@ -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;

}