IPv6: Add dontfrag argument to relevant functions

Add dontfrag argument to relevant functions for
IPV6_DONTFRAG support, as well as allowing the value
to be passed-in via ancillary cmsg data.

Signed-off-by: Brian Haley <brian.haley@hp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 7 insertions, 2 deletions

diff --git a/net/ipv6/raw.c b/net/ipv6/raw.c
index 8763b1a0814..44a84ea9b3e 100644
--- a/net/ipv6/raw.c
+++ b/net/ipv6/raw.c
@@ -733,6 +733,7 @@ static int rawv6_sendmsg(struct kiocb *iocb, struct sock *sk,
         int addr_len = msg->msg_namelen;
         int hlimit = -1;
         int tclass = -1;
+        int dontfrag = -1;
         u16 proto;
         int err;
 
@@ -811,7 +812,8 @@ static int rawv6_sendmsg(struct kiocb *iocb, struct sock *sk,
                 memset(opt, 0, sizeof(struct ipv6_txoptions));
                 opt->tot_len = sizeof(struct ipv6_txoptions);
 
-                err = datagram_send_ctl(sock_net(sk), msg, &fl, opt, &hlimit, &tclass);
+                err = datagram_send_ctl(sock_net(sk), msg, &fl, opt, &hlimit,
+                                        &tclass, &dontfrag);
                 if (err < 0) {
                         fl6_sock_release(flowlabel);
                         return err;
@@ -880,6 +882,9 @@ static int rawv6_sendmsg(struct kiocb *iocb, struct sock *sk,
         if (tclass < 0)
                 tclass = np->tclass;
 
+        if (dontfrag < 0)
+                dontfrag = np->dontfrag;
+
         if (msg->msg_flags&MSG_CONFIRM)
                 goto do_confirm;
 
@@ -890,7 +895,7 @@ back_from_confirm:
                 lock_sock(sk);
                 err = ip6_append_data(sk, ip_generic_getfrag, msg->msg_iov,
                         len, 0, hlimit, tclass, opt, &fl, (struct rt6_info*)dst,
-                        msg->msg_flags);
+                        msg->msg_flags, dontfrag);
 
                 if (err)
                         ip6_flush_pending_frames(sk);