1 #include <linux/skbuff.h>
2 #include <linux/netdevice.h>
3 #include <linux/if_vlan.h>
4 #include <linux/netpoll.h>
5 #include <linux/export.h>
8 bool vlan_do_receive(struct sk_buff **skbp, bool last_handler)
10 struct sk_buff *skb = *skbp;
11 u16 vlan_id = skb->vlan_tci & VLAN_VID_MASK;
12 struct net_device *vlan_dev;
13 struct vlan_pcpu_stats *rx_stats;
15 vlan_dev = vlan_find_dev(skb->dev, vlan_id);
17 /* Only the last call to vlan_do_receive() should change
18 * pkt_type to PACKET_OTHERHOST
20 if (vlan_id && last_handler)
21 skb->pkt_type = PACKET_OTHERHOST;
25 skb = *skbp = skb_share_check(skb, GFP_ATOMIC);
30 if (skb->pkt_type == PACKET_OTHERHOST) {
31 /* Our lower layer thinks this is not local, let's make sure.
32 * This allows the VLAN to have a different MAC than the
33 * underlying device, and still route correctly. */
34 if (!compare_ether_addr(eth_hdr(skb)->h_dest,
36 skb->pkt_type = PACKET_HOST;
39 if (!(vlan_dev_info(vlan_dev)->flags & VLAN_FLAG_REORDER_HDR)) {
40 unsigned int offset = skb->data - skb_mac_header(skb);
43 * vlan_insert_tag expect skb->data pointing to mac header.
44 * So change skb->data before calling it and change back to
45 * original position later
47 skb_push(skb, offset);
48 skb = *skbp = vlan_insert_tag(skb, skb->vlan_tci);
51 skb_pull(skb, offset + VLAN_HLEN);
52 skb_reset_mac_len(skb);
55 skb->priority = vlan_get_ingress_priority(vlan_dev, skb->vlan_tci);
58 rx_stats = this_cpu_ptr(vlan_dev_info(vlan_dev)->vlan_pcpu_stats);
60 u64_stats_update_begin(&rx_stats->syncp);
61 rx_stats->rx_packets++;
62 rx_stats->rx_bytes += skb->len;
63 if (skb->pkt_type == PACKET_MULTICAST)
64 rx_stats->rx_multicast++;
65 u64_stats_update_end(&rx_stats->syncp);
70 /* Must be invoked with rcu_read_lock or with RTNL. */
71 struct net_device *__vlan_find_dev_deep(struct net_device *real_dev,
74 struct vlan_group *grp = rcu_dereference_rtnl(real_dev->vlgrp);
77 return vlan_group_get_device(grp, vlan_id);
80 * Bonding slaves do not have grp assigned to themselves.
81 * Grp is assigned to bonding master instead.
83 if (netif_is_bond_slave(real_dev))
84 return __vlan_find_dev_deep(real_dev->master, vlan_id);
89 EXPORT_SYMBOL(__vlan_find_dev_deep);
91 struct net_device *vlan_dev_real_dev(const struct net_device *dev)
93 return vlan_dev_info(dev)->real_dev;
95 EXPORT_SYMBOL(vlan_dev_real_dev);
97 u16 vlan_dev_vlan_id(const struct net_device *dev)
99 return vlan_dev_info(dev)->vlan_id;
101 EXPORT_SYMBOL(vlan_dev_vlan_id);
103 static struct sk_buff *vlan_reorder_header(struct sk_buff *skb)
105 if (skb_cow(skb, skb_headroom(skb)) < 0)
107 memmove(skb->data - ETH_HLEN, skb->data - VLAN_ETH_HLEN, 2 * ETH_ALEN);
108 skb->mac_header += VLAN_HLEN;
109 skb_reset_mac_len(skb);
113 struct sk_buff *vlan_untag(struct sk_buff *skb)
115 struct vlan_hdr *vhdr;
118 if (unlikely(vlan_tx_tag_present(skb))) {
119 /* vlan_tci is already set-up so leave this for another time */
123 skb = skb_share_check(skb, GFP_ATOMIC);
127 if (unlikely(!pskb_may_pull(skb, VLAN_HLEN)))
130 vhdr = (struct vlan_hdr *) skb->data;
131 vlan_tci = ntohs(vhdr->h_vlan_TCI);
132 __vlan_hwaccel_put_tag(skb, vlan_tci);
134 skb_pull_rcsum(skb, VLAN_HLEN);
135 vlan_set_encap_proto(skb, vhdr);
137 skb = vlan_reorder_header(skb);
141 skb_reset_network_header(skb);
142 skb_reset_transport_header(skb);