sctp: allow setting SCTP_SACK_IMMEDIATELY by the application

This patch extends commit b93d6471748d ("sctp: implement the sender side
for SACK-IMMEDIATELY extension") as it didn't white list
SCTP_SACK_IMMEDIATELY on sctp_msghdr_parse(), causing it to be
understood as an invalid flag and returning -EINVAL to the application.

Note that the actual handling of the flag is already there in
sctp_datamsg_from_user().

https://tools.ietf.org/html/rfc7053#section-7

Fixes: b93d6471748d ("sctp: implement the sender side for SACK-IMMEDIATELY extension")
Signed-off-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Acked-by: Vlad Yasevich <vyasevich@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 0 deletions

diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index 9bb80ec4c08f..5ca2ebfe0be8 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -6636,6 +6636,7 @@ static int sctp_msghdr_parse(const struct msghdr *msg, sctp_cmsgs_t *cmsgs)
 
                         if (cmsgs->srinfo->sinfo_flags &
                             ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
+                              SCTP_SACK_IMMEDIATELY |
                               SCTP_ABORT | SCTP_EOF))
                                 return -EINVAL;
                         break;
@@ -6659,6 +6660,7 @@ static int sctp_msghdr_parse(const struct msghdr *msg, sctp_cmsgs_t *cmsgs)
 
                         if (cmsgs->sinfo->snd_flags &
                             ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
+                              SCTP_SACK_IMMEDIATELY |
                               SCTP_ABORT | SCTP_EOF))
                                 return -EINVAL;
                         break;