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 gro_result_t
  78 vlan_gro_common(struct napi_struct *napi, struct vlan_group *grp,
  79                 unsigned int vlan_tci, struct sk_buff *skb)
  80 {
  81         struct sk_buff *p;
  82
  83         if (skb_bond_should_drop(skb))
  84                 goto drop;
  85
  86         skb->vlan_tci = vlan_tci;
  87         skb->dev = vlan_group_get_device(grp, vlan_tci & VLAN_VID_MASK);
  88
  89         if (!skb->dev)
  90                 goto drop;
  91
  92         for (p = napi->gro_list; p; p = p->next) {
  93                 NAPI_GRO_CB(p)->same_flow =
  94                         p->dev == skb->dev && !compare_ether_header(
  95                                 skb_mac_header(p), skb_gro_mac_header(skb));
  96                 NAPI_GRO_CB(p)->flush = 0;
  97         }
  98
  99         return dev_gro_receive(napi, skb);
 100
 101 drop:
 102         return GRO_DROP;
 103 }
 104
 105 gro_result_t vlan_gro_receive(struct napi_struct *napi, struct vlan_group *grp,
 106                               unsigned int vlan_tci, struct sk_buff *skb)
 107 {
 108         if (netpoll_rx_on(skb))
 109                 return vlan_hwaccel_receive_skb(skb, grp, vlan_tci)
 110                         ? GRO_DROP : GRO_NORMAL;
 111
 112         skb_gro_reset_offset(skb);
 113
 114         return napi_skb_finish(vlan_gro_common(napi, grp, vlan_tci, skb), skb);
 115 }
 116 EXPORT_SYMBOL(vlan_gro_receive);
 117
 118 gro_result_t vlan_gro_frags(struct napi_struct *napi, struct vlan_group *grp,
 119                             unsigned int vlan_tci)
 120 {
 121         struct sk_buff *skb = napi_frags_skb(napi);
 122
 123         if (!skb)
 124                 return GRO_DROP;
 125
 126         if (netpoll_rx_on(skb)) {
 127                 skb->protocol = eth_type_trans(skb, skb->dev);
 128                 return vlan_hwaccel_receive_skb(skb, grp, vlan_tci)
 129                         ? GRO_DROP : GRO_NORMAL;
 130         }
 131
 132         return napi_frags_finish(napi, skb,
 133                                  vlan_gro_common(napi, grp, vlan_tci, skb));
 134 }
 135 EXPORT_SYMBOL(vlan_gro_frags);