atm: [br2864] fix routed vcmux support

From: Eric Kinzie <ekinzie@cmf.nrl.navy.mil>
Signed-off-by: Chas Williams <chas@cmf.nrl.navy.mil>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/atm/br2684.c b/net/atm/br2684.c
index ac60350..05fafdc 100644 (file)
--- a/net/atm/br2684.c
+++ b/net/atm/br2684.c
@@ -188,10 +188,13 @@ static int br2684_xmit_vcc(struct sk_buff *skb, struct br2684_dev *brdev,
                                return 0;
                        }
                }
-       } else {
-               skb_push(skb, 2);
-               if (brdev->payload == p_bridged)
+       } else { /* e_vc */
+               if (brdev->payload == p_bridged) {
+                       skb_push(skb, 2);
                        memset(skb->data, 0, 2);
+               } else { /* p_routed */
+                       skb_pull(skb, ETH_HLEN);
+               }
        }
        skb_debug(skb);
 
@@ -377,11 +380,8 @@ static void br2684_push(struct atm_vcc *atmvcc, struct sk_buff *skb)
                                 (skb->data + 6, ethertype_ipv4,
                                  sizeof(ethertype_ipv4)) == 0)
                                skb->protocol = __constant_htons(ETH_P_IP);
-                       else {
-                               brdev->stats.rx_errors++;
-                               dev_kfree_skb(skb);
-                               return;
-                       }
+                       else
+                               goto error;
                        skb_pull(skb, sizeof(llc_oui_ipv4));
                        skb_reset_network_header(skb);
                        skb->pkt_type = PACKET_HOST;
@@ -394,44 +394,56 @@ static void br2684_push(struct atm_vcc *atmvcc, struct sk_buff *skb)
                           (memcmp(skb->data, llc_oui_pid_pad, 7) == 0)) {
                        skb_pull(skb, sizeof(llc_oui_pid_pad));
                        skb->protocol = eth_type_trans(skb, net_dev);
-               } else {
-                       brdev->stats.rx_errors++;
-                       dev_kfree_skb(skb);
-                       return;
-               }
+               } else
+                       goto error;
 
-       } else {
-               /* first 2 chars should be 0 */
-               if (*((u16 *) (skb->data)) != 0) {
-                       brdev->stats.rx_errors++;
-                       dev_kfree_skb(skb);
-                       return;
+       } else { /* e_vc */
+               if (brdev->payload == p_routed) {
+                       struct iphdr *iph;
+
+                       skb_reset_network_header(skb);
+                       iph = ip_hdr(skb);
+                       if (iph->version == 4)
+                               skb->protocol = __constant_htons(ETH_P_IP);
+                       else if (iph->version == 6)
+                               skb->protocol = __constant_htons(ETH_P_IPV6);
+                       else
+                               goto error;
+                       skb->pkt_type = PACKET_HOST;
+               } else { /* p_bridged */
+                       /* first 2 chars should be 0 */
+                       if (*((u16 *) (skb->data)) != 0)
+                               goto error;
+                       skb_pull(skb, BR2684_PAD_LEN);
+                       skb->protocol = eth_type_trans(skb, net_dev);
                }
-               skb_pull(skb, BR2684_PAD_LEN + ETH_HLEN);       /* pad, dstmac, srcmac, ethtype */
-               skb->protocol = eth_type_trans(skb, net_dev);
        }
 
 #ifdef CONFIG_ATM_BR2684_IPFILTER
-       if (unlikely(packet_fails_filter(skb->protocol, brvcc, skb))) {
-               brdev->stats.rx_dropped++;
-               dev_kfree_skb(skb);
-               return;
-       }
+       if (unlikely(packet_fails_filter(skb->protocol, brvcc, skb)))
+               goto dropped;
 #endif /* CONFIG_ATM_BR2684_IPFILTER */
        skb->dev = net_dev;
        ATM_SKB(skb)->vcc = atmvcc;     /* needed ? */
        pr_debug("received packet's protocol: %x\n", ntohs(skb->protocol));
        skb_debug(skb);
-       if (unlikely(!(net_dev->flags & IFF_UP))) {
-               /* sigh, interface is down */
-               brdev->stats.rx_dropped++;
-               dev_kfree_skb(skb);
-               return;
-       }
+       /* sigh, interface is down? */
+       if (unlikely(!(net_dev->flags & IFF_UP)))
+               goto dropped;
        brdev->stats.rx_packets++;
        brdev->stats.rx_bytes += skb->len;
        memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
        netif_rx(skb);
+       return;
+
+dropped:
+       brdev->stats.rx_dropped++;
+       goto free_skb;
+error:
+       brdev->stats.rx_errors++;
+free_skb:
+       dev_kfree_skb(skb);
+       return;
 }
 
 /*