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