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: Xin Long <lucien.xin@gmail.com> Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -284,6 +284,8 @@ enum sctp_sinfo_flags {
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SCTP_ADDR_OVER = (1 << 1), /* Override the primary destination. */
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SCTP_ABORT = (1 << 2), /* Send an ABORT message to the peer. */
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SCTP_SACK_IMMEDIATELY = (1 << 3), /* SACK should be sent without delay. */
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/* 2 bits here have been used by SCTP_PR_SCTP_MASK */
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SCTP_SENDALL = (1 << 6),
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SCTP_NOTIFICATION = MSG_NOTIFICATION, /* Next message is not user msg but notification. */
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SCTP_EOF = MSG_FIN, /* Initiate graceful shutdown process. */
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};
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@ -1820,6 +1820,10 @@ static int sctp_sendmsg_check_sflags(struct sctp_association *asoc,
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if (sctp_state(asoc, CLOSED) && sctp_style(sk, TCP))
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return -EPIPE;
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if ((sflags & SCTP_SENDALL) && sctp_style(sk, UDP) &&
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!sctp_state(asoc, ESTABLISHED))
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return 0;
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if (sflags & SCTP_EOF) {
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pr_debug("%s: shutting down association:%p\n", __func__, asoc);
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sctp_primitive_SHUTDOWN(net, asoc, NULL);
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@ -2007,6 +2011,29 @@ static int sctp_sendmsg(struct sock *sk, struct msghdr *msg, size_t msg_len)
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lock_sock(sk);
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/* SCTP_SENDALL process */
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if ((sflags & SCTP_SENDALL) && sctp_style(sk, UDP)) {
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list_for_each_entry(asoc, &ep->asocs, asocs) {
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err = sctp_sendmsg_check_sflags(asoc, sflags, msg,
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msg_len);
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if (err == 0)
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continue;
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if (err < 0)
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goto out_unlock;
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sctp_sendmsg_update_sinfo(asoc, sinfo, &cmsgs);
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err = sctp_sendmsg_to_asoc(asoc, msg, msg_len,
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NULL, sinfo);
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if (err < 0)
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goto out_unlock;
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iov_iter_revert(&msg->msg_iter, err);
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}
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goto out_unlock;
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}
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/* Get and check or create asoc */
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if (daddr) {
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asoc = sctp_endpoint_lookup_assoc(ep, daddr, &transport);
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@ -7792,8 +7819,8 @@ static int sctp_msghdr_parse(const struct msghdr *msg, struct sctp_cmsgs *cmsgs)
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if (cmsgs->srinfo->sinfo_flags &
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~(SCTP_UNORDERED | SCTP_ADDR_OVER |
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SCTP_SACK_IMMEDIATELY | SCTP_PR_SCTP_MASK |
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SCTP_ABORT | SCTP_EOF))
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SCTP_SACK_IMMEDIATELY | SCTP_SENDALL |
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SCTP_PR_SCTP_MASK | SCTP_ABORT | SCTP_EOF))
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return -EINVAL;
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break;
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@ -7816,8 +7843,8 @@ static int sctp_msghdr_parse(const struct msghdr *msg, struct sctp_cmsgs *cmsgs)
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if (cmsgs->sinfo->snd_flags &
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~(SCTP_UNORDERED | SCTP_ADDR_OVER |
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SCTP_SACK_IMMEDIATELY | SCTP_PR_SCTP_MASK |
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SCTP_ABORT | SCTP_EOF))
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SCTP_SACK_IMMEDIATELY | SCTP_SENDALL |
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SCTP_PR_SCTP_MASK | SCTP_ABORT | SCTP_EOF))
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return -EINVAL;
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break;
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case SCTP_PRINFO:
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