[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, 3 deletions

diff --git a/net/ipv6/icmp.c b/net/ipv6/icmp.c
index fa8f1bb0aa52..34e99c55e856 100644
--- a/net/ipv6/icmp.c
+++ b/net/ipv6/icmp.c
@@ -287,7 +287,7 @@ void icmpv6_send(struct sk_buff *skb, int type, int code, __u32 info,
         int iif = 0;
         int addr_type = 0;
         int len;
-        int hlimit;
+        int hlimit, tclass;
         int err = 0;
 
         if ((u8*)hdr < skb->head || (u8*)(hdr+1) > skb->tail)
@@ -385,6 +385,10 @@ void icmpv6_send(struct sk_buff *skb, int type, int code, __u32 info,
         if (hlimit < 0)
                 hlimit = ipv6_get_hoplimit(dst->dev);
 
+        tclass = np->cork.tclass;
+        if (tclass < 0)
+                tclass = 0;
+
         msg.skb = skb;
         msg.offset = skb->nh.raw - skb->data;
 
@@ -400,7 +404,7 @@ void icmpv6_send(struct sk_buff *skb, int type, int code, __u32 info,
         err = ip6_append_data(sk, icmpv6_getfrag, &msg,
                               len + sizeof(struct icmp6hdr),
                               sizeof(struct icmp6hdr),
-                              hlimit, NULL, &fl, (struct rt6_info*)dst,
+                              hlimit, tclass, NULL, &fl, (struct rt6_info*)dst,
                               MSG_DONTWAIT);
         if (err) {
                 ip6_flush_pending_frames(sk);
@@ -434,6 +438,7 @@ static void icmpv6_echo_reply(struct sk_buff *skb)
         struct dst_entry *dst;
         int err = 0;
         int hlimit;
+        int tclass;
 
         saddr = &skb->nh.ipv6h->daddr;
 
@@ -475,13 +480,17 @@ static void icmpv6_echo_reply(struct sk_buff *skb)
         if (hlimit < 0)
                 hlimit = ipv6_get_hoplimit(dst->dev);
 
+        tclass = np->cork.tclass;
+        if (tclass < 0)
+                tclass = 0;
+
         idev = in6_dev_get(skb->dev);
 
         msg.skb = skb;
         msg.offset = 0;
 
         err = ip6_append_data(sk, icmpv6_getfrag, &msg, skb->len + sizeof(struct icmp6hdr),
-                                sizeof(struct icmp6hdr), hlimit, NULL, &fl,
+                                sizeof(struct icmp6hdr), hlimit, tclass, NULL, &fl,
                                 (struct rt6_info*)dst, MSG_DONTWAIT);
 
         if (err) {