net/8021q/vlan_core.c

   1 #include <linux/skbuff.h>
   2 #include <linux/netdevice.h>
   3 #include <linux/if_vlan.h>
   4 #include "vlan.h"
   5
   6 /* VLAN rx hw acceleration helper.  This acts like netif_{rx,receive_skb}(). */
   7 int __vlan_hwaccel_rx(struct sk_buff *skb, struct vlan_group *grp,
   8                       u16 vlan_tci, int polling)
   9 {
  10         if (skb_bond_should_drop(skb))
  11                 goto drop;
  12
  13         skb->vlan_tci = vlan_tci;
  14         skb->dev = vlan_group_get_device(grp, vlan_tci & VLAN_VID_MASK);
  15
  16         if (!skb->dev)
  17                 goto drop;
  18
  19         return (polling ? netif_receive_skb(skb) : netif_rx(skb));
  20
  21 drop:
  22         dev_kfree_skb_any(skb);
  23         return NET_RX_DROP;
  24 }
  25 EXPORT_SYMBOL(__vlan_hwaccel_rx);
  26
  27 int vlan_hwaccel_do_receive(struct sk_buff *skb)
  28 {
  29         struct net_device *dev = skb->dev;
  30         struct net_device_stats *stats;
  31
  32         skb->dev = vlan_dev_info(dev)->real_dev;
  33         netif_nit_deliver(skb);
  34
  35         skb->dev = dev;
  36         skb->priority = vlan_get_ingress_priority(dev, skb->vlan_tci);
  37         skb->vlan_tci = 0;
  38
  39         stats = &dev->stats;
  40         stats->rx_packets++;
  41         stats->rx_bytes += skb->len;
  42
  43         switch (skb->pkt_type) {
  44         case PACKET_BROADCAST:
  45                 break;
  46         case PACKET_MULTICAST:
  47                 stats->multicast++;
  48                 break;
  49         case PACKET_OTHERHOST:
  50                 /* Our lower layer thinks this is not local, let's make sure.
  51                  * This allows the VLAN to have a different MAC than the
  52                  * underlying device, and still route correctly. */
  53                 if (!compare_ether_addr(eth_hdr(skb)->h_dest,
  54                                         dev->dev_addr))
  55                         skb->pkt_type = PACKET_HOST;
  56                 break;
  57         };
  58         return 0;
  59 }
  60
  61 struct net_device *vlan_dev_real_dev(const struct net_device *dev)
  62 {
  63         return vlan_dev_info(dev)->real_dev;
  64 }
  65 EXPORT_SYMBOL(vlan_dev_real_dev);
  66
  67 u16 vlan_dev_vlan_id(const struct net_device *dev)
  68 {
  69         return vlan_dev_info(dev)->vlan_id;
  70 }
  71 EXPORT_SYMBOL(vlan_dev_vlan_id);
  72
  73 static int vlan_gro_common(struct napi_struct *napi, struct vlan_group *grp,
  74                            unsigned int vlan_tci, struct sk_buff *skb)
  75 {
  76         struct sk_buff *p;
  77
  78         if (skb_bond_should_drop(skb))
  79                 goto drop;
  80
  81         skb->vlan_tci = vlan_tci;
  82         skb->dev = vlan_group_get_device(grp, vlan_tci & VLAN_VID_MASK);
  83
  84         if (!skb->dev)
  85                 goto drop;
  86
  87         for (p = napi->gro_list; p; p = p->next) {
  88                 NAPI_GRO_CB(p)->same_flow = p->dev == skb->dev;
  89                 NAPI_GRO_CB(p)->flush = 0;
  90         }
  91
  92         return dev_gro_receive(napi, skb);
  93
  94 drop:
  95         return 2;
  96 }
  97
  98 int vlan_gro_receive(struct napi_struct *napi, struct vlan_group *grp,
  99                      unsigned int vlan_tci, struct sk_buff *skb)
 100 {
 101         int err = NET_RX_SUCCESS;
 102
 103         switch (vlan_gro_common(napi, grp, vlan_tci, skb)) {
 104         case -1:
 105                 return netif_receive_skb(skb);
 106
 107         case 2:
 108                 err = NET_RX_DROP;
 109                 /* fall through */
 110
 111         case 1:
 112                 kfree_skb(skb);
 113                 break;
 114         }
 115
 116         return err;
 117 }
 118 EXPORT_SYMBOL(vlan_gro_receive);
 119
 120 int vlan_gro_frags(struct napi_struct *napi, struct vlan_group *grp,
 121                    unsigned int vlan_tci, struct napi_gro_fraginfo *info)
 122 {
 123         struct sk_buff *skb = napi_fraginfo_skb(napi, info);
 124         int err = NET_RX_DROP;
 125
 126         if (!skb)
 127                 goto out;
 128
 129         err = NET_RX_SUCCESS;
 130
 131         switch (vlan_gro_common(napi, grp, vlan_tci, skb)) {
 132         case -1:
 133                 return netif_receive_skb(skb);
 134
 135         case 2:
 136                 err = NET_RX_DROP;
 137                 /* fall through */
 138
 139         case 1:
 140                 napi_reuse_skb(napi, skb);
 141                 break;
 142         }
 143
 144 out:
 145         return err;
 146 }
 147 EXPORT_SYMBOL(vlan_gro_frags);