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                 if (!(skb->dev->flags & IFF_PROMISC))
  29                         goto drop;
  30                 skb->pkt_type = PACKET_OTHERHOST;
  31         }
  32
  33         return polling ? netif_receive_skb(skb) : netif_rx(skb);
  34
  35 drop:
  36         dev_kfree_skb_any(skb);
  37         return NET_RX_DROP;
  38 }
  39 EXPORT_SYMBOL(__vlan_hwaccel_rx);
  40
  41 void vlan_hwaccel_do_receive(struct sk_buff *skb)
  42 {
  43         struct net_device *dev = skb->dev;
  44         struct vlan_rx_stats     *rx_stats;
  45
  46         skb->dev = vlan_dev_real_dev(dev);
  47         netif_nit_deliver(skb);
  48
  49         skb->dev = dev;
  50         skb->priority = vlan_get_ingress_priority(dev, skb->vlan_tci);
  51         skb->vlan_tci = 0;
  52
  53         rx_stats = this_cpu_ptr(vlan_dev_info(dev)->vlan_rx_stats);
  54
  55         u64_stats_update_begin(&rx_stats->syncp);
  56         rx_stats->rx_packets++;
  57         rx_stats->rx_bytes += skb->len;
  58
  59         switch (skb->pkt_type) {
  60         case PACKET_BROADCAST:
  61                 break;
  62         case PACKET_MULTICAST:
  63                 rx_stats->rx_multicast++;
  64                 break;
  65         case PACKET_OTHERHOST:
  66                 /* Our lower layer thinks this is not local, let's make sure.
  67                  * This allows the VLAN to have a different MAC than the
  68                  * underlying device, and still route correctly. */
  69                 if (!compare_ether_addr(eth_hdr(skb)->h_dest,
  70                                         dev->dev_addr))
  71                         skb->pkt_type = PACKET_HOST;
  72                 break;
  73         }
  74         u64_stats_update_end(&rx_stats->syncp);
  75 }
  76
  77 struct net_device *vlan_dev_real_dev(const struct net_device *dev)
  78 {
  79         return vlan_dev_info(dev)->real_dev;
  80 }
  81 EXPORT_SYMBOL(vlan_dev_real_dev);
  82
  83 u16 vlan_dev_vlan_id(const struct net_device *dev)
  84 {
  85         return vlan_dev_info(dev)->vlan_id;
  86 }
  87 EXPORT_SYMBOL(vlan_dev_vlan_id);
  88
  89 static gro_result_t
  90 vlan_gro_common(struct napi_struct *napi, struct vlan_group *grp,
  91                 unsigned int vlan_tci, struct sk_buff *skb)
  92 {
  93         struct sk_buff *p;
  94         struct net_device *vlan_dev;
  95         u16 vlan_id;
  96
  97         if (skb_bond_should_drop(skb, ACCESS_ONCE(skb->dev->master)))
  98                 skb->deliver_no_wcard = 1;
  99
 100         skb->skb_iif = skb->dev->ifindex;
 101         __vlan_hwaccel_put_tag(skb, vlan_tci);
 102         vlan_id = vlan_tci & VLAN_VID_MASK;
 103         vlan_dev = vlan_group_get_device(grp, vlan_id);
 104
 105         if (vlan_dev)
 106                 skb->dev = vlan_dev;
 107         else if (vlan_id) {
 108                 if (!(skb->dev->flags & IFF_PROMISC))
 109                         goto drop;
 110                 skb->pkt_type = PACKET_OTHERHOST;
 111         }
 112
 113         for (p = napi->gro_list; p; p = p->next) {
 114                 unsigned long diffs;
 115
 116                 diffs = (unsigned long)p->dev ^ (unsigned long)skb->dev;
 117                 diffs |= compare_ether_header(skb_mac_header(p),
 118                                               skb_gro_mac_header(skb));
 119                 NAPI_GRO_CB(p)->same_flow = !diffs;
 120                 NAPI_GRO_CB(p)->flush = 0;
 121         }
 122
 123         return dev_gro_receive(napi, skb);
 124
 125 drop:
 126         return GRO_DROP;
 127 }
 128
 129 gro_result_t vlan_gro_receive(struct napi_struct *napi, struct vlan_group *grp,
 130                               unsigned int vlan_tci, struct sk_buff *skb)
 131 {
 132         if (netpoll_rx_on(skb))
 133                 return vlan_hwaccel_receive_skb(skb, grp, vlan_tci)
 134                         ? GRO_DROP : GRO_NORMAL;
 135
 136         skb_gro_reset_offset(skb);
 137
 138         return napi_skb_finish(vlan_gro_common(napi, grp, vlan_tci, skb), skb);
 139 }
 140 EXPORT_SYMBOL(vlan_gro_receive);
 141
 142 gro_result_t vlan_gro_frags(struct napi_struct *napi, struct vlan_group *grp,
 143                             unsigned int vlan_tci)
 144 {
 145         struct sk_buff *skb = napi_frags_skb(napi);
 146
 147         if (!skb)
 148                 return GRO_DROP;
 149
 150         if (netpoll_rx_on(skb)) {
 151                 skb->protocol = eth_type_trans(skb, skb->dev);
 152                 return vlan_hwaccel_receive_skb(skb, grp, vlan_tci)
 153                         ? GRO_DROP : GRO_NORMAL;
 154         }
 155
 156         return napi_frags_finish(napi, skb,
 157                                  vlan_gro_common(napi, grp, vlan_tci, skb));
 158 }
 159 EXPORT_SYMBOL(vlan_gro_frags);