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, ACCESS_ONCE(skb->dev->master)))
  15                 goto drop;
  16
  17         skb->skb_iif = skb->dev->ifindex;
  18         __vlan_hwaccel_put_tag(skb, vlan_tci);
  19         skb->dev = vlan_group_get_device(grp, vlan_tci & VLAN_VID_MASK);
  20
  21         if (!skb->dev)
  22                 goto drop;
  23
  24         return (polling ? netif_receive_skb(skb) : netif_rx(skb));
  25
  26 drop:
  27         dev_kfree_skb_any(skb);
  28         return NET_RX_DROP;
  29 }
  30 EXPORT_SYMBOL(__vlan_hwaccel_rx);
  31
  32 int vlan_hwaccel_do_receive(struct sk_buff *skb)
  33 {
  34         struct net_device *dev = skb->dev;
  35         struct vlan_rx_stats     *rx_stats;
  36
  37         skb->dev = vlan_dev_info(dev)->real_dev;
  38         netif_nit_deliver(skb);
  39
  40         skb->dev = dev;
  41         skb->priority = vlan_get_ingress_priority(dev, skb->vlan_tci);
  42         skb->vlan_tci = 0;
  43
  44         rx_stats = per_cpu_ptr(vlan_dev_info(dev)->vlan_rx_stats,
  45                                smp_processor_id());
  46
  47         rx_stats->rx_packets++;
  48         rx_stats->rx_bytes += skb->len;
  49
  50         switch (skb->pkt_type) {
  51         case PACKET_BROADCAST:
  52                 break;
  53         case PACKET_MULTICAST:
  54                 rx_stats->multicast++;
  55                 break;
  56         case PACKET_OTHERHOST:
  57                 /* Our lower layer thinks this is not local, let's make sure.
  58                  * This allows the VLAN to have a different MAC than the
  59                  * underlying device, and still route correctly. */
  60                 if (!compare_ether_addr(eth_hdr(skb)->h_dest,
  61                                         dev->dev_addr))
  62                         skb->pkt_type = PACKET_HOST;
  63                 break;
  64         };
  65         return 0;
  66 }
  67
  68 struct net_device *vlan_dev_real_dev(const struct net_device *dev)
  69 {
  70         return vlan_dev_info(dev)->real_dev;
  71 }
  72 EXPORT_SYMBOL(vlan_dev_real_dev);
  73
  74 u16 vlan_dev_vlan_id(const struct net_device *dev)
  75 {
  76         return vlan_dev_info(dev)->vlan_id;
  77 }
  78 EXPORT_SYMBOL(vlan_dev_vlan_id);
  79
  80 static gro_result_t
  81 vlan_gro_common(struct napi_struct *napi, struct vlan_group *grp,
  82                 unsigned int vlan_tci, struct sk_buff *skb)
  83 {
  84         struct sk_buff *p;
  85
  86         if (skb_bond_should_drop(skb, ACCESS_ONCE(skb->dev->master)))
  87                 goto drop;
  88
  89         skb->skb_iif = skb->dev->ifindex;
  90         __vlan_hwaccel_put_tag(skb, vlan_tci);
  91         skb->dev = vlan_group_get_device(grp, vlan_tci & VLAN_VID_MASK);
  92
  93         if (!skb->dev)
  94                 goto drop;
  95
  96         for (p = napi->gro_list; p; p = p->next) {
  97                 NAPI_GRO_CB(p)->same_flow =
  98                         p->dev == skb->dev && !compare_ether_header(
  99                                 skb_mac_header(p), skb_gro_mac_header(skb));
 100                 NAPI_GRO_CB(p)->flush = 0;
 101         }
 102
 103         return dev_gro_receive(napi, skb);
 104
 105 drop:
 106         return GRO_DROP;
 107 }
 108
 109 gro_result_t vlan_gro_receive(struct napi_struct *napi, struct vlan_group *grp,
 110                               unsigned int vlan_tci, struct sk_buff *skb)
 111 {
 112         if (netpoll_rx_on(skb))
 113                 return vlan_hwaccel_receive_skb(skb, grp, vlan_tci)
 114                         ? GRO_DROP : GRO_NORMAL;
 115
 116         skb_gro_reset_offset(skb);
 117
 118         return napi_skb_finish(vlan_gro_common(napi, grp, vlan_tci, skb), skb);
 119 }
 120 EXPORT_SYMBOL(vlan_gro_receive);
 121
 122 gro_result_t vlan_gro_frags(struct napi_struct *napi, struct vlan_group *grp,
 123                             unsigned int vlan_tci)
 124 {
 125         struct sk_buff *skb = napi_frags_skb(napi);
 126
 127         if (!skb)
 128                 return GRO_DROP;
 129
 130         if (netpoll_rx_on(skb)) {
 131                 skb->protocol = eth_type_trans(skb, skb->dev);
 132                 return vlan_hwaccel_receive_skb(skb, grp, vlan_tci)
 133                         ? GRO_DROP : GRO_NORMAL;
 134         }
 135
 136         return napi_frags_finish(napi, skb,
 137                                  vlan_gro_common(napi, grp, vlan_tci, skb));
 138 }
 139 EXPORT_SYMBOL(vlan_gro_frags);