packet: support per-packet fwmark for af_packet sendmsg

Signed-off-by: Edward Hyunkoo Jee <edjee@google.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index 104910f..20c44e2 100644 (file)
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -2630,6 +2630,7 @@ static int packet_snd(struct socket *sock, struct msghdr *msg, size_t len)
        __be16 proto;
        unsigned char *addr;
        int err, reserve = 0;
+       struct sockcm_cookie sockc;
        struct virtio_net_hdr vnet_hdr = { 0 };
        int offset = 0;
        int vnet_hdr_len;
@@ -2665,6 +2666,13 @@ static int packet_snd(struct socket *sock, struct msghdr *msg, size_t len)
        if (unlikely(!(dev->flags & IFF_UP)))
                goto out_unlock;
 
+       sockc.mark = sk->sk_mark;
+       if (msg->msg_controllen) {
+               err = sock_cmsg_send(sk, msg, &sockc);
+               if (unlikely(err))
+                       goto out_unlock;
+       }
+
        if (sock->type == SOCK_RAW)
                reserve = dev->hard_header_len;
        if (po->has_vnet_hdr) {
@@ -2774,7 +2782,7 @@ static int packet_snd(struct socket *sock, struct msghdr *msg, size_t len)
        skb->protocol = proto;
        skb->dev = dev;
        skb->priority = sk->sk_priority;
-       skb->mark = sk->sk_mark;
+       skb->mark = sockc.mark;
 
        packet_pick_tx_queue(dev, skb);