net/8021q/vlan_core.c

   1 #include <linux/skbuff.h>
   2 #include <linux/netdevice.h>
   3 #include <linux/if_vlan.h>
   4 #include <linux/netpoll.h>
   5 #include "vlan.h"
   6
   7 /* VLAN rx hw acceleration helper.  This acts like netif_{rx,receive_skb}(). */
   8 int __vlan_hwaccel_rx(struct sk_buff *skb, struct vlan_group *grp,
   9                       u16 vlan_tci, int polling)
  10 {
  11         if (netpoll_rx(skb))
  12                 return NET_RX_DROP;
  13
  14         if (skb_bond_should_drop(skb))
  15                 goto drop;
  16
  17         skb->vlan_tci = vlan_tci;
  18         skb->dev = vlan_group_get_device(grp, vlan_tci & VLAN_VID_MASK);
  19
  20         if (!skb->dev)
  21                 goto drop;
  22
  23         return (polling ? netif_receive_skb(skb) : netif_rx(skb));
  24
  25 drop:
  26         dev_kfree_skb_any(skb);
  27         return NET_RX_DROP;
  28 }
  29 EXPORT_SYMBOL(__vlan_hwaccel_rx);
  30
  31 int vlan_hwaccel_do_receive(struct sk_buff *skb)
  32 {
  33         struct net_device *dev = skb->dev;
  34         struct net_device_stats *stats;
  35
  36         skb->dev = vlan_dev_info(dev)->real_dev;
  37         netif_nit_deliver(skb);
  38
  39         skb->dev = dev;
  40         skb->priority = vlan_get_ingress_priority(dev, skb->vlan_tci);
  41         skb->vlan_tci = 0;
  42
  43         stats = &dev->stats;
  44         stats->rx_packets++;
  45         stats->rx_bytes += skb->len;
  46
  47         switch (skb->pkt_type) {
  48         case PACKET_BROADCAST:
  49                 break;
  50         case PACKET_MULTICAST:
  51                 stats->multicast++;
  52                 break;
  53         case PACKET_OTHERHOST:
  54                 /* Our lower layer thinks this is not local, let's make sure.
  55                  * This allows the VLAN to have a different MAC than the
  56                  * underlying device, and still route correctly. */
  57                 if (!compare_ether_addr(eth_hdr(skb)->h_dest,
  58                                         dev->dev_addr))
  59                         skb->pkt_type = PACKET_HOST;
  60                 break;
  61         };
  62         return 0;
  63 }
  64
  65 struct net_device *vlan_dev_real_dev(const struct net_device *dev)
  66 {
  67         return vlan_dev_info(dev)->real_dev;
  68 }
  69 EXPORT_SYMBOL(vlan_dev_real_dev);
  70
  71 u16 vlan_dev_vlan_id(const struct net_device *dev)
  72 {
  73         return vlan_dev_info(dev)->vlan_id;
  74 }
  75 EXPORT_SYMBOL(vlan_dev_vlan_id);
  76
  77 static int vlan_gro_common(struct napi_struct *napi, struct vlan_group *grp,
  78                            unsigned int vlan_tci, struct sk_buff *skb)
  79 {
  80         struct sk_buff *p;
  81
  82         if (skb_bond_should_drop(skb))
  83                 goto drop;
  84
  85         skb->vlan_tci = vlan_tci;
  86         skb->dev = vlan_group_get_device(grp, vlan_tci & VLAN_VID_MASK);
  87
  88         if (!skb->dev)
  89                 goto drop;
  90
  91         for (p = napi->gro_list; p; p = p->next) {
  92                 NAPI_GRO_CB(p)->same_flow = p->dev == skb->dev;
  93                 NAPI_GRO_CB(p)->flush = 0;
  94         }
  95
  96         return dev_gro_receive(napi, skb);
  97
  98 drop:
  99         return 2;
 100 }
 101
 102 int vlan_gro_receive(struct napi_struct *napi, struct vlan_group *grp,
 103                      unsigned int vlan_tci, struct sk_buff *skb)
 104 {
 105         int err = NET_RX_SUCCESS;
 106
 107         if (netpoll_receive_skb(skb))
 108                 return NET_RX_DROP;
 109
 110         switch (vlan_gro_common(napi, grp, vlan_tci, skb)) {
 111         case -1:
 112                 return netif_receive_skb(skb);
 113
 114         case 2:
 115                 err = NET_RX_DROP;
 116                 /* fall through */
 117
 118         case 1:
 119                 kfree_skb(skb);
 120                 break;
 121         }
 122
 123         return err;
 124 }
 125 EXPORT_SYMBOL(vlan_gro_receive);
 126
 127 int vlan_gro_frags(struct napi_struct *napi, struct vlan_group *grp,
 128                    unsigned int vlan_tci, struct napi_gro_fraginfo *info)
 129 {
 130         struct sk_buff *skb = napi_fraginfo_skb(napi, info);
 131         int err = NET_RX_DROP;
 132
 133         if (!skb)
 134                 goto out;
 135
 136         if (netpoll_receive_skb(skb))
 137                 goto out;
 138
 139         err = NET_RX_SUCCESS;
 140
 141         switch (vlan_gro_common(napi, grp, vlan_tci, skb)) {
 142         case -1:
 143                 return netif_receive_skb(skb);
 144
 145         case 2:
 146                 err = NET_RX_DROP;
 147                 /* fall through */
 148
 149         case 1:
 150                 napi_reuse_skb(napi, skb);
 151                 break;
 152         }
 153
 154 out:
 155         return err;
 156 }
 157 EXPORT_SYMBOL(vlan_gro_frags);