1 #ifndef __LINUX_IF_VLAN_WRAPPER_H
2 #define __LINUX_IF_VLAN_WRAPPER_H 1
4 #include_next <linux/if_vlan.h>
5 #include <linux/skbuff.h>
8 * The behavior of __vlan_put_tag() has changed over time:
10 * - In 2.6.26 and earlier, it adjusted both MAC and network header
11 * pointers. (The latter didn't make any sense.)
13 * - In 2.6.27 and 2.6.28, it did not adjust any header pointers at all.
15 * - In 2.6.29 and later, it adjusts the MAC header pointer only.
17 * This is the version from 2.6.33. We unconditionally substitute this version
18 * to avoid the need to guess whether the version in the kernel tree is
21 #define __vlan_put_tag rpl_vlan_put_tag
22 static inline struct sk_buff *__vlan_put_tag(struct sk_buff *skb, u16 vlan_tci)
24 struct vlan_ethhdr *veth;
26 if (skb_cow_head(skb, VLAN_HLEN) < 0) {
30 veth = (struct vlan_ethhdr *)skb_push(skb, VLAN_HLEN);
32 /* Move the mac addresses to the beginning of the new header. */
33 memmove(skb->data, skb->data + VLAN_HLEN, 2 * VLAN_ETH_ALEN);
34 skb->mac_header -= VLAN_HLEN;
36 /* first, the ethernet type */
37 veth->h_vlan_proto = htons(ETH_P_8021Q);
40 veth->h_vlan_TCI = htons(vlan_tci);
42 skb->protocol = htons(ETH_P_8021Q);
48 /* All of these were introduced in a single commit preceding 2.6.33, so
49 * presumably all of them or none of them are present. */
50 #ifndef VLAN_PRIO_MASK
51 #define VLAN_PRIO_MASK 0xe000 /* Priority Code Point */
52 #define VLAN_PRIO_SHIFT 13
53 #define VLAN_CFI_MASK 0x1000 /* Canonical Format Indicator */
54 #define VLAN_TAG_PRESENT VLAN_CFI_MASK
57 /* This function is not exported from kernel. OVS Upstreaming patch will
59 static inline void vlan_set_encap_proto(struct sk_buff *skb, struct vlan_hdr *vhdr)
65 * Was a VLAN packet, grab the encapsulated protocol, which the layer
66 * three protocols care about.
69 proto = vhdr->h_vlan_encapsulated_proto;
70 if (ntohs(proto) >= 1536) {
71 skb->protocol = proto;
76 if (*(unsigned short *) rawp == 0xFFFF)
78 * This is a magic hack to spot IPX packets. Older Novell
79 * breaks the protocol design and runs IPX over 802.3 without
80 * an 802.2 LLC layer. We look for FFFF which isn't a used
81 * 802.2 SSAP/DSAP. This won't work for fault tolerant netware
82 * but does for the rest.
84 skb->protocol = htons(ETH_P_802_3);
89 skb->protocol = htons(ETH_P_802_2);
91 #endif /* linux/if_vlan.h wrapper */