[NET]: Introducing socket mark socket option.

A userspace program may wish to set the mark for each packets its send
without using the netfilter MARK target. Changing the mark can be used
for mark based routing without netfilter or for packet filtering.

It requires CAP_NET_ADMIN capability.

Signed-off-by: Laszlo Attila Toth <panther@balabit.hu>
Acked-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 0 deletions

diff --git a/net/ipv4/raw.c b/net/ipv4/raw.c
index 85c08696abbe..f863c3dc5421 100644
--- a/net/ipv4/raw.c
+++ b/net/ipv4/raw.c
@@ -352,6 +352,7 @@ static int raw_send_hdrinc(struct sock *sk, void *from, size_t length,
         skb_reserve(skb, hh_len);
 
         skb->priority = sk->sk_priority;
+        skb->mark = sk->sk_mark;
         skb->dst = dst_clone(&rt->u.dst);
 
         skb_reset_network_header(skb);
@@ -544,6 +545,7 @@ static int raw_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
 
         {
                 struct flowi fl = { .oif = ipc.oif,
+                                    .mark = sk->sk_mark,
                                     .nl_u = { .ip4_u =
                                               { .daddr = daddr,
                                                 .saddr = saddr,