Commit 772a5869 authored by Xin Long's avatar Xin Long Committed by David S. Miller
Browse files

sctp: add stream interleave enable members and sockopt 



This patch adds intl_enable in asoc and netns, and strm_interleave in
sctp_sock to indicate if stream interleave is enabled and supported.

netns intl_enable would be set via procfs, but that is not added yet
until all stream interleave codes are completely implemented; asoc
intl_enable will be set when doing 4-shakehands.

sp strm_interleave can be set by sockopt SCTP_INTERLEAVING_SUPPORTED
which is also added in this patch. This socket option is defined in
section 4.3.1 of RFC8260.

Note that strm_interleave can only be set by sockopt when both netns
intl_enable and sp frag_interleave are set.

Signed-off-by: default avatarXin Long <lucien.xin@gmail.com>
Acked-by: default avatarMarcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Acked-by: default avatarNeil Horman <nhorman@tuxdriver.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 92ff4264

include/net/netns/sctp.h

+4 −1
Original line number Diff line number Diff line
@@ -122,9 +122,12 @@ struct netns_sctp { 
	/* Flag to indicate if PR-CONFIG is enabled. */

	int reconf_enable;



	/* Flag to idicate if SCTP-AUTH is enabled */

	/* Flag to indicate if SCTP-AUTH is enabled */

	int auth_enable;



	/* Flag to indicate if stream interleave is enabled */

	int intl_enable;



	/*

	 * Policy to control SCTP IPv4 address scoping

	 * 0   - Disable IPv4 address scoping

include/net/sctp/structs.h

+2 −0
Original line number Diff line number Diff line
@@ -217,6 +217,7 @@ struct sctp_sock { 
		disable_fragments:1,

		v4mapped:1,

		frag_interleave:1,

		strm_interleave:1,

		recvrcvinfo:1,

		recvnxtinfo:1,

		data_ready_signalled:1;
@@ -1940,6 +1941,7 @@ struct sctp_association { 
	__u8 need_ecne:1,	/* Need to send an ECNE Chunk? */

	     temp:1,		/* Is it a temporary association? */

	     force_delay:1,

	     intl_enable:1,

	     prsctp_enable:1,

	     reconf_enable:1;

include/uapi/linux/sctp.h

+1 −0
Original line number Diff line number Diff line
@@ -125,6 +125,7 @@ typedef __s32 sctp_assoc_t; 
#define SCTP_SOCKOPT_PEELOFF_FLAGS 122

#define SCTP_STREAM_SCHEDULER	123

#define SCTP_STREAM_SCHEDULER_VALUE	124

#define SCTP_INTERLEAVING_SUPPORTED	125



/* PR-SCTP policies */

#define SCTP_PR_SCTP_NONE	0x0000

net/sctp/socket.c

+87 −1
Original line number Diff line number Diff line
@@ -3350,7 +3350,10 @@ static int sctp_setsockopt_fragment_interleave(struct sock *sk, 
	if (get_user(val, (int __user *)optval))

		return -EFAULT;



	sctp_sk(sk)->frag_interleave = (val == 0) ? 0 : 1;

	sctp_sk(sk)->frag_interleave = !!val;



	if (!sctp_sk(sk)->frag_interleave)

		sctp_sk(sk)->strm_interleave = 0;



	return 0;

}
@@ -4019,6 +4022,40 @@ out: 
	return retval;

}



static int sctp_setsockopt_interleaving_supported(struct sock *sk,

						  char __user *optval,

						  unsigned int optlen)

{

	struct sctp_sock *sp = sctp_sk(sk);

	struct net *net = sock_net(sk);

	struct sctp_assoc_value params;

	int retval = -EINVAL;



	if (optlen < sizeof(params))

		goto out;



	optlen = sizeof(params);

	if (copy_from_user(&params, optval, optlen)) {

		retval = -EFAULT;

		goto out;

	}



	if (params.assoc_id)

		goto out;



	if (!net->sctp.intl_enable || !sp->frag_interleave) {

		retval = -EPERM;

		goto out;

	}



	sp->strm_interleave = !!params.assoc_value;



	retval = 0;



out:

	return retval;

}



/* API 6.2 setsockopt(), getsockopt()

 *

 * Applications use setsockopt() and getsockopt() to set or retrieve
@@ -4206,6 +4243,10 @@ static int sctp_setsockopt(struct sock *sk, int level, int optname, 
	case SCTP_STREAM_SCHEDULER_VALUE:

		retval = sctp_setsockopt_scheduler_value(sk, optval, optlen);

		break;

	case SCTP_INTERLEAVING_SUPPORTED:

		retval = sctp_setsockopt_interleaving_supported(sk, optval,

								optlen);

		break;

	default:

		retval = -ENOPROTOOPT;

		break;
@@ -6969,6 +7010,47 @@ out: 
	return retval;

}



static int sctp_getsockopt_interleaving_supported(struct sock *sk, int len,

						  char __user *optval,

						  int __user *optlen)

{

	struct sctp_assoc_value params;

	struct sctp_association *asoc;

	int retval = -EFAULT;



	if (len < sizeof(params)) {

		retval = -EINVAL;

		goto out;

	}



	len = sizeof(params);

	if (copy_from_user(&params, optval, len))

		goto out;



	asoc = sctp_id2assoc(sk, params.assoc_id);

	if (asoc) {

		params.assoc_value = asoc->intl_enable;

	} else if (!params.assoc_id) {

		struct sctp_sock *sp = sctp_sk(sk);



		params.assoc_value = sp->strm_interleave;

	} else {

		retval = -EINVAL;

		goto out;

	}



	if (put_user(len, optlen))

		goto out;



	if (copy_to_user(optval, &params, len))

		goto out;



	retval = 0;



out:

	return retval;

}



static int sctp_getsockopt(struct sock *sk, int level, int optname,

			   char __user *optval, int __user *optlen)

{
@@ -7159,6 +7241,10 @@ static int sctp_getsockopt(struct sock *sk, int level, int optname, 
		retval = sctp_getsockopt_scheduler_value(sk, len, optval,

							 optlen);

		break;

	case SCTP_INTERLEAVING_SUPPORTED:

		retval = sctp_getsockopt_interleaving_supported(sk, len, optval,

								optlen);

		break;

	default:

		retval = -ENOPROTOOPT;

		break;

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