linux/net/8021q/vlan_core.c
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   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}(). */
   8int __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
  25drop:
  26        dev_kfree_skb_any(skb);
  27        return NET_RX_DROP;
  28}
  29EXPORT_SYMBOL(__vlan_hwaccel_rx);
  30
  31int 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
  65struct net_device *vlan_dev_real_dev(const struct net_device *dev)
  66{
  67        return vlan_dev_info(dev)->real_dev;
  68}
  69EXPORT_SYMBOL(vlan_dev_real_dev);
  70
  71u16 vlan_dev_vlan_id(const struct net_device *dev)
  72{
  73        return vlan_dev_info(dev)->vlan_id;
  74}
  75EXPORT_SYMBOL(vlan_dev_vlan_id);
  76
  77static 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
  98drop:
  99        return 2;
 100}
 101
 102int 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}
 125EXPORT_SYMBOL(vlan_gro_receive);
 126
 127int 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
 154out:
 155        return err;
 156}
 157EXPORT_SYMBOL(vlan_gro_frags);
 158