Commit 1c02e377 authored by David S. Miller's avatar David S. Miller
Browse files

Merge branch 'sctp-add-support-for-some-msg_control-options-from-RFC6458' 



Xin Long says:

====================
sctp: add support for some msg_control options from RFC6458

This patchset is to add support for 3 msg_control options described
in RFC6458:

    5.3.7.  SCTP PR-SCTP Information Structure (SCTP_PRINFO)
    5.3.9.  SCTP Destination IPv4 Address Structure (SCTP_DSTADDRV4)
    5.3.10. SCTP Destination IPv6 Address Structure (SCTP_DSTADDRV6)

one send flag described in RFC6458:

    SCTP_SENDALL:  This flag, if set, will cause a one-to-many
    style socket to send the message to all associations that
    are currently established on this socket.  For the one-to-
    one style socket, this flag has no effect.

Note there is another msg_control option:

    5.3.8.  SCTP AUTH Information Structure (SCTP_AUTHINFO)

It's a little complicated, I will post it in another patchset after
this.
====================

Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parents 5c3d0fd4 49102805

include/net/sctp/structs.h

+2 −0
Original line number Diff line number Diff line
@@ -2112,6 +2112,8 @@ struct sctp_cmsgs { 
	struct sctp_initmsg *init;

	struct sctp_sndrcvinfo *srinfo;

	struct sctp_sndinfo *sinfo;

	struct sctp_prinfo *prinfo;

	struct msghdr *addrs_msg;

};



/* Structure for tracking memory objects */

include/uapi/linux/sctp.h

+23 −0
Original line number Diff line number Diff line
@@ -260,6 +260,19 @@ struct sctp_nxtinfo { 
	sctp_assoc_t nxt_assoc_id;

};



/* 5.3.7 SCTP PR-SCTP Information Structure (SCTP_PRINFO)

 *

 *   This cmsghdr structure specifies SCTP options for sendmsg().

 *

 *   cmsg_level    cmsg_type      cmsg_data[]

 *   ------------  ------------   -------------------

 *   IPPROTO_SCTP  SCTP_PRINFO    struct sctp_prinfo

 */

struct sctp_prinfo {

	__u16 pr_policy;

	__u32 pr_value;

};



/*

 *  sinfo_flags: 16 bits (unsigned integer)

 *
@@ -271,6 +284,8 @@ enum sctp_sinfo_flags { 
	SCTP_ADDR_OVER		= (1 << 1), /* Override the primary destination. */

	SCTP_ABORT		= (1 << 2), /* Send an ABORT message to the peer. */

	SCTP_SACK_IMMEDIATELY	= (1 << 3), /* SACK should be sent without delay. */

	/* 2 bits here have been used by SCTP_PR_SCTP_MASK */

	SCTP_SENDALL		= (1 << 6),

	SCTP_NOTIFICATION	= MSG_NOTIFICATION, /* Next message is not user msg but notification. */

	SCTP_EOF		= MSG_FIN,  /* Initiate graceful shutdown process. */

};
@@ -293,6 +308,14 @@ typedef enum sctp_cmsg_type { 
#define SCTP_RCVINFO	SCTP_RCVINFO

	SCTP_NXTINFO,		/* 5.3.6 SCTP Next Receive Information Structure */

#define SCTP_NXTINFO	SCTP_NXTINFO

	SCTP_PRINFO,		/* 5.3.7 SCTP PR-SCTP Information Structure */

#define SCTP_PRINFO	SCTP_PRINFO

	SCTP_AUTHINFO,		/* 5.3.8 SCTP AUTH Information Structure (RESERVED) */

#define SCTP_AUTHINFO	SCTP_AUTHINFO

	SCTP_DSTADDRV4,		/* 5.3.9 SCTP Destination IPv4 Address Structure */

#define SCTP_DSTADDRV4	SCTP_DSTADDRV4

	SCTP_DSTADDRV6,		/* 5.3.10 SCTP Destination IPv6 Address Structure */

#define SCTP_DSTADDRV6	SCTP_DSTADDRV6

} sctp_cmsg_t;



/*

net/sctp/socket.c

+138 −5
Original line number Diff line number Diff line
@@ -1644,6 +1644,12 @@ static int sctp_sendmsg_parse(struct sock *sk, struct sctp_cmsgs *cmsgs, 
		srinfo->sinfo_assoc_id = cmsgs->sinfo->snd_assoc_id;

	}



	if (cmsgs->prinfo) {

		srinfo->sinfo_timetolive = cmsgs->prinfo->pr_value;

		SCTP_PR_SET_POLICY(srinfo->sinfo_flags,

				   cmsgs->prinfo->pr_policy);

	}



	sflags = srinfo->sinfo_flags;

	if (!sflags && msg_len)

		return 0;
@@ -1670,6 +1676,7 @@ static int sctp_sendmsg_new_asoc(struct sock *sk, __u16 sflags, 
	struct net *net = sock_net(sk);

	struct sctp_association *asoc;

	enum sctp_scope scope;

	struct cmsghdr *cmsg;

	int err = -EINVAL;



	*tp = NULL;
@@ -1735,6 +1742,67 @@ static int sctp_sendmsg_new_asoc(struct sock *sk, __u16 sflags, 
		goto free;

	}



	if (!cmsgs->addrs_msg)

		return 0;



	/* sendv addr list parse */

	for_each_cmsghdr(cmsg, cmsgs->addrs_msg) {

		struct sctp_transport *transport;

		struct sctp_association *old;

		union sctp_addr _daddr;

		int dlen;



		if (cmsg->cmsg_level != IPPROTO_SCTP ||

		    (cmsg->cmsg_type != SCTP_DSTADDRV4 &&

		     cmsg->cmsg_type != SCTP_DSTADDRV6))

			continue;



		daddr = &_daddr;

		memset(daddr, 0, sizeof(*daddr));

		dlen = cmsg->cmsg_len - sizeof(struct cmsghdr);

		if (cmsg->cmsg_type == SCTP_DSTADDRV4) {

			if (dlen < sizeof(struct in_addr))

				goto free;



			dlen = sizeof(struct in_addr);

			daddr->v4.sin_family = AF_INET;

			daddr->v4.sin_port = htons(asoc->peer.port);

			memcpy(&daddr->v4.sin_addr, CMSG_DATA(cmsg), dlen);

		} else {

			if (dlen < sizeof(struct in6_addr))

				goto free;



			dlen = sizeof(struct in6_addr);

			daddr->v6.sin6_family = AF_INET6;

			daddr->v6.sin6_port = htons(asoc->peer.port);

			memcpy(&daddr->v6.sin6_addr, CMSG_DATA(cmsg), dlen);

		}

		err = sctp_verify_addr(sk, daddr, sizeof(*daddr));

		if (err)

			goto free;



		old = sctp_endpoint_lookup_assoc(ep, daddr, &transport);

		if (old && old != asoc) {

			if (old->state >= SCTP_STATE_ESTABLISHED)

				err = -EISCONN;

			else

				err = -EALREADY;

			goto free;

		}



		if (sctp_endpoint_is_peeled_off(ep, daddr)) {

			err = -EADDRNOTAVAIL;

			goto free;

		}



		transport = sctp_assoc_add_peer(asoc, daddr, GFP_KERNEL,

						SCTP_UNKNOWN);

		if (!transport) {

			err = -ENOMEM;

			goto free;

		}

	}



	return 0;



free:
@@ -1752,6 +1820,10 @@ static int sctp_sendmsg_check_sflags(struct sctp_association *asoc, 
	if (sctp_state(asoc, CLOSED) && sctp_style(sk, TCP))

		return -EPIPE;



	if ((sflags & SCTP_SENDALL) && sctp_style(sk, UDP) &&

	    !sctp_state(asoc, ESTABLISHED))

		return 0;



	if (sflags & SCTP_EOF) {

		pr_debug("%s: shutting down association:%p\n", __func__, asoc);

		sctp_primitive_SHUTDOWN(net, asoc, NULL);
@@ -1901,9 +1973,12 @@ static void sctp_sendmsg_update_sinfo(struct sctp_association *asoc, 
		sinfo->sinfo_ppid = asoc->default_ppid;

		sinfo->sinfo_context = asoc->default_context;

		sinfo->sinfo_assoc_id = sctp_assoc2id(asoc);



		if (!cmsgs->prinfo)

			sinfo->sinfo_flags = asoc->default_flags;

	}



	if (!cmsgs->srinfo)

	if (!cmsgs->srinfo && !cmsgs->prinfo)

		sinfo->sinfo_timetolive = asoc->default_timetolive;

}
@@ -1936,6 +2011,29 @@ static int sctp_sendmsg(struct sock *sk, struct msghdr *msg, size_t msg_len) 


	lock_sock(sk);



	/* SCTP_SENDALL process */

	if ((sflags & SCTP_SENDALL) && sctp_style(sk, UDP)) {

		list_for_each_entry(asoc, &ep->asocs, asocs) {

			err = sctp_sendmsg_check_sflags(asoc, sflags, msg,

							msg_len);

			if (err == 0)

				continue;

			if (err < 0)

				goto out_unlock;



			sctp_sendmsg_update_sinfo(asoc, sinfo, &cmsgs);



			err = sctp_sendmsg_to_asoc(asoc, msg, msg_len,

						   NULL, sinfo);

			if (err < 0)

				goto out_unlock;



			iov_iter_revert(&msg->msg_iter, err);

		}



		goto out_unlock;

	}



	/* Get and check or create asoc */

	if (daddr) {

		asoc = sctp_endpoint_lookup_assoc(ep, daddr, &transport);
@@ -7721,8 +7819,8 @@ static int sctp_msghdr_parse(const struct msghdr *msg, struct sctp_cmsgs *cmsgs) 


			if (cmsgs->srinfo->sinfo_flags &

			    ~(SCTP_UNORDERED | SCTP_ADDR_OVER |

			      SCTP_SACK_IMMEDIATELY | SCTP_PR_SCTP_MASK |

			      SCTP_ABORT | SCTP_EOF))

			      SCTP_SACK_IMMEDIATELY | SCTP_SENDALL |

			      SCTP_PR_SCTP_MASK | SCTP_ABORT | SCTP_EOF))

				return -EINVAL;

			break;
@@ -7745,10 +7843,45 @@ static int sctp_msghdr_parse(const struct msghdr *msg, struct sctp_cmsgs *cmsgs) 


			if (cmsgs->sinfo->snd_flags &

			    ~(SCTP_UNORDERED | SCTP_ADDR_OVER |

			      SCTP_SACK_IMMEDIATELY | SCTP_PR_SCTP_MASK |

			      SCTP_ABORT | SCTP_EOF))

			      SCTP_SACK_IMMEDIATELY | SCTP_SENDALL |

			      SCTP_PR_SCTP_MASK | SCTP_ABORT | SCTP_EOF))

				return -EINVAL;

			break;

		case SCTP_PRINFO:

			/* SCTP Socket API Extension

			 * 5.3.7 SCTP PR-SCTP Information Structure (SCTP_PRINFO)

			 *

			 * This cmsghdr structure specifies SCTP options for sendmsg().

			 *

			 * cmsg_level    cmsg_type      cmsg_data[]

			 * ------------  ------------   ---------------------

			 * IPPROTO_SCTP  SCTP_PRINFO    struct sctp_prinfo

			 */

			if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_prinfo)))

				return -EINVAL;



			cmsgs->prinfo = CMSG_DATA(cmsg);

			if (cmsgs->prinfo->pr_policy & ~SCTP_PR_SCTP_MASK)

				return -EINVAL;



			if (cmsgs->prinfo->pr_policy == SCTP_PR_SCTP_NONE)

				cmsgs->prinfo->pr_value = 0;

			break;

		case SCTP_DSTADDRV4:

		case SCTP_DSTADDRV6:

			/* SCTP Socket API Extension

			 * 5.3.9/10 SCTP Destination IPv4/6 Address Structure (SCTP_DSTADDRV4/6)

			 *

			 * This cmsghdr structure specifies SCTP options for sendmsg().

			 *

			 * cmsg_level    cmsg_type         cmsg_data[]

			 * ------------  ------------   ---------------------

			 * IPPROTO_SCTP  SCTP_DSTADDRV4 struct in_addr

			 * ------------  ------------   ---------------------

			 * IPPROTO_SCTP  SCTP_DSTADDRV6 struct in6_addr

			 */

			cmsgs->addrs_msg = my_msg;

			break;

		default:

			return -EINVAL;

		}

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