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Commit 49102805 authored by Xin Long's avatar Xin Long Committed by David S. Miller
Browse files

sctp: add support for snd flag SCTP_SENDALL process in sendmsg 



This patch is to add support for snd flag SCTP_SENDALL process
in sendmsg, as described in section 5.3.4 of RFC6458.

With this flag, you can send the same data to all the asocs of
this sk once.

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 2c0dbaa0

include/uapi/linux/sctp.h

+2 −0
Original line number Diff line number Diff line
@@ -284,6 +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. */

};

net/sctp/socket.c

+31 −4
Original line number Diff line number Diff line
@@ -1820,6 +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);
@@ -2007,6 +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);
@@ -7792,8 +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;
@@ -7816,8 +7843,8 @@ 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: