[IPV6]: Support IPV6_{RECV,}TCLASS socket options / ancillary data.

Based on patch from David L Stevens <dlstevens@us.ibm.com>

Signed-off-by: David L Stevens <dlstevens@us.ibm.com>
Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>

1 files changed, 12 insertions, 4 deletions

diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index aa6eaf3f18a6..dbd18a9d1669 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -637,6 +637,7 @@ static int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk,
         int addr_len = msg->msg_namelen;
         int ulen = len;
         int hlimit = -1;
+        int tclass = -1;
         int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
         int err;
 
@@ -758,7 +759,7 @@ do_udp_sendmsg:
                 memset(opt, 0, sizeof(struct ipv6_txoptions));
                 opt->tot_len = sizeof(*opt);
 
-                err = datagram_send_ctl(msg, fl, opt, &hlimit);
+                err = datagram_send_ctl(msg, fl, opt, &hlimit, &tclass);
                 if (err < 0) {
                         fl6_sock_release(flowlabel);
                         return err;
@@ -814,6 +815,12 @@ do_udp_sendmsg:
                         hlimit = ipv6_get_hoplimit(dst->dev);
         }
 
+        if (tclass < 0) {
+                tclass = np->tclass;
+                if (tclass < 0)
+                        tclass = 0;
+        }
+
         if (msg->msg_flags&MSG_CONFIRM)
                 goto do_confirm;
 back_from_confirm:
@@ -833,9 +840,10 @@ back_from_confirm:
 
 do_append_data:
         up->len += ulen;
-        err = ip6_append_data(sk, ip_generic_getfrag, msg->msg_iov, ulen, sizeof(struct udphdr),
-                              hlimit, opt, fl, (struct rt6_info*)dst,
-                              corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags);
+        err = ip6_append_data(sk, ip_generic_getfrag, msg->msg_iov, ulen,
+                sizeof(struct udphdr), hlimit, tclass, opt, fl,
+                (struct rt6_info*)dst,
+                corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags);
         if (err)
                 udp_v6_flush_pending_frames(sk);
         else if (!corkreq)