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         struct net_device *vlan_dev;
  12         u16 vlan_id;
  13
  14         if (netpoll_rx(skb))
  15                 return NET_RX_DROP;
  16
  17         if (skb_bond_should_drop(skb, ACCESS_ONCE(skb->dev->master)))
  18                 skb->deliver_no_wcard = 1;
  19
  20         skb->skb_iif = skb->dev->ifindex;
  21         __vlan_hwaccel_put_tag(skb, vlan_tci);
  22         vlan_id = vlan_tci & VLAN_VID_MASK;
  23         vlan_dev = vlan_group_get_device(grp, vlan_id);
  24
  25         if (vlan_dev)
  26                 skb->dev = vlan_dev;
  27         else if (vlan_id)
  28                 goto drop;
  29
  30         return (polling ? netif_receive_skb(skb) : netif_rx(skb));
  31
  32 drop:
  33         dev_kfree_skb_any(skb);
  34         return NET_RX_DROP;
  35 }
  36 EXPORT_SYMBOL(__vlan_hwaccel_rx);
  37
  38 int vlan_hwaccel_do_receive(struct sk_buff *skb)
  39 {
  40         struct net_device *dev = skb->dev;
  41         struct vlan_rx_stats     *rx_stats;
  42
  43         skb->dev = vlan_dev_info(dev)->real_dev;
  44         netif_nit_deliver(skb);
  45
  46         skb->dev = dev;
  47         skb->priority = vlan_get_ingress_priority(dev, skb->vlan_tci);
  48         skb->vlan_tci = 0;
  49
  50         rx_stats = this_cpu_ptr(vlan_dev_info(dev)->vlan_rx_stats);
  51
  52         u64_stats_update_begin(&rx_stats->syncp);
  53         rx_stats->rx_packets++;
  54         rx_stats->rx_bytes += skb->len;
  55
  56         switch (skb->pkt_type) {
  57         case PACKET_BROADCAST:
  58                 break;
  59         case PACKET_MULTICAST:
  60                 rx_stats->rx_multicast++;
  61                 break;
  62         case PACKET_OTHERHOST:
  63                 /* Our lower layer thinks this is not local, let's make sure.
  64                  * This allows the VLAN to have a different MAC than the
  65                  * underlying device, and still route correctly. */
  66                 if (!compare_ether_addr(eth_hdr(skb)->h_dest,
  67                                         dev->dev_addr))
  68                         skb->pkt_type = PACKET_HOST;
  69                 break;
  70         }
  71         u64_stats_update_end(&rx_stats->syncp);
  72         return 0;
  73 }
  74
  75 struct net_device *vlan_dev_real_dev(const struct net_device *dev)
  76 {
  77         return vlan_dev_info(dev)->real_dev;
  78 }
  79 EXPORT_SYMBOL(vlan_dev_real_dev);
  80
  81 u16 vlan_dev_vlan_id(const struct net_device *dev)
  82 {
  83         return vlan_dev_info(dev)->vlan_id;
  84 }
  85 EXPORT_SYMBOL(vlan_dev_vlan_id);
  86
  87 static gro_result_t
  88 vlan_gro_common(struct napi_struct *napi, struct vlan_group *grp,
  89                 unsigned int vlan_tci, struct sk_buff *skb)
  90 {
  91         struct sk_buff *p;
  92         struct net_device *vlan_dev;
  93         u16 vlan_id;
  94
  95         if (skb_bond_should_drop(skb, ACCESS_ONCE(skb->dev->master)))
  96                 skb->deliver_no_wcard = 1;
  97
  98         skb->skb_iif = skb->dev->ifindex;
  99         __vlan_hwaccel_put_tag(skb, vlan_tci);
 100         vlan_id = vlan_tci & VLAN_VID_MASK;
 101         vlan_dev = vlan_group_get_device(grp, vlan_id);
 102
 103         if (vlan_dev)
 104                 skb->dev = vlan_dev;
 105         else if (vlan_id)
 106                 goto drop;
 107
 108         for (p = napi->gro_list; p; p = p->next) {
 109                 NAPI_GRO_CB(p)->same_flow =
 110                         p->dev == skb->dev && !compare_ether_header(
 111                                 skb_mac_header(p), skb_gro_mac_header(skb));
 112                 NAPI_GRO_CB(p)->flush = 0;
 113         }
 114
 115         return dev_gro_receive(napi, skb);
 116
 117 drop:
 118         return GRO_DROP;
 119 }
 120
 121 gro_result_t vlan_gro_receive(struct napi_struct *napi, struct vlan_group *grp,
 122                               unsigned int vlan_tci, struct sk_buff *skb)
 123 {
 124         if (netpoll_rx_on(skb))
 125                 return vlan_hwaccel_receive_skb(skb, grp, vlan_tci)
 126                         ? GRO_DROP : GRO_NORMAL;
 127
 128         skb_gro_reset_offset(skb);
 129
 130         return napi_skb_finish(vlan_gro_common(napi, grp, vlan_tci, skb), skb);
 131 }
 132 EXPORT_SYMBOL(vlan_gro_receive);
 133
 134 gro_result_t vlan_gro_frags(struct napi_struct *napi, struct vlan_group *grp,
 135                             unsigned int vlan_tci)
 136 {
 137         struct sk_buff *skb = napi_frags_skb(napi);
 138
 139         if (!skb)
 140                 return GRO_DROP;
 141
 142         if (netpoll_rx_on(skb)) {
 143                 skb->protocol = eth_type_trans(skb, skb->dev);
 144                 return vlan_hwaccel_receive_skb(skb, grp, vlan_tci)
 145                         ? GRO_DROP : GRO_NORMAL;
 146         }
 147
 148         return napi_frags_finish(napi, skb,
 149                                  vlan_gro_common(napi, grp, vlan_tci, skb));
 150 }
 151 EXPORT_SYMBOL(vlan_gro_frags);