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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>
This commit is contained in:
Xin Long 2018-03-05 20:44:20 +08:00 committed by David S. Miller
parent 2c0dbaa0c4
commit 4910280503
2 changed files with 33 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
include/uapi/linux/sctp.h
View File

@ -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. */
};

35
net/sctp/socket.c
View File

@ -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: