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, ACCESS_ONCE(skb->dev->master)))
  15                skb->deliver_no_wcard = 1;
  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
  26drop:
  27        dev_kfree_skb_any(skb);
  28        return NET_RX_DROP;
  29}
  30EXPORT_SYMBOL(__vlan_hwaccel_rx);
  31
  32int 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
  68struct net_device *vlan_dev_real_dev(const struct net_device *dev)
  69{
  70        return vlan_dev_info(dev)->real_dev;
  71}
  72EXPORT_SYMBOL(vlan_dev_real_dev);
  73
  74u16 vlan_dev_vlan_id(const struct net_device *dev)
  75{
  76        return vlan_dev_info(dev)->vlan_id;
  77}
  78EXPORT_SYMBOL(vlan_dev_vlan_id);
  79
  80static gro_result_t
  81vlan_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                skb->deliver_no_wcard = 1;
  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
 105drop:
 106        return GRO_DROP;
 107}
 108
 109gro_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}
 120EXPORT_SYMBOL(vlan_gro_receive);
 121
 122gro_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}
 139EXPORT_SYMBOL(vlan_gro_frags);
 140