Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * VLAN An implementation of 802.1Q VLAN tagging. |
| 3 | * |
| 4 | * Authors: Ben Greear <greearb@candelatech.com> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU General Public License |
| 8 | * as published by the Free Software Foundation; either version |
| 9 | * 2 of the License, or (at your option) any later version. |
| 10 | * |
| 11 | */ |
| 12 | |
| 13 | #ifndef _LINUX_IF_VLAN_H_ |
| 14 | #define _LINUX_IF_VLAN_H_ |
| 15 | |
| 16 | #ifdef __KERNEL__ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | #include <linux/netdevice.h> |
Stephen Hemminger | 0610d11 | 2006-07-14 16:34:22 -0700 | [diff] [blame] | 18 | #include <linux/etherdevice.h> |
Jesse Gross | 65ac6a5 | 2010-10-20 13:56:05 +0000 | [diff] [blame] | 19 | #include <linux/rtnetlink.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | |
| 21 | #define VLAN_HLEN 4 /* The additional bytes (on top of the Ethernet header) |
| 22 | * that VLAN requires. |
| 23 | */ |
| 24 | #define VLAN_ETH_ALEN 6 /* Octets in one ethernet addr */ |
| 25 | #define VLAN_ETH_HLEN 18 /* Total octets in header. */ |
| 26 | #define VLAN_ETH_ZLEN 64 /* Min. octets in frame sans FCS */ |
| 27 | |
| 28 | /* |
| 29 | * According to 802.3ac, the packet can be 4 bytes longer. --Klika Jan |
| 30 | */ |
| 31 | #define VLAN_ETH_DATA_LEN 1500 /* Max. octets in payload */ |
| 32 | #define VLAN_ETH_FRAME_LEN 1518 /* Max. octets in frame sans FCS */ |
| 33 | |
Patrick McHardy | 740c15d | 2008-01-21 00:18:53 -0800 | [diff] [blame] | 34 | /* |
| 35 | * struct vlan_hdr - vlan header |
| 36 | * @h_vlan_TCI: priority and VLAN ID |
| 37 | * @h_vlan_encapsulated_proto: packet type ID or len |
| 38 | */ |
| 39 | struct vlan_hdr { |
| 40 | __be16 h_vlan_TCI; |
| 41 | __be16 h_vlan_encapsulated_proto; |
| 42 | }; |
| 43 | |
| 44 | /** |
| 45 | * struct vlan_ethhdr - vlan ethernet header (ethhdr + vlan_hdr) |
| 46 | * @h_dest: destination ethernet address |
| 47 | * @h_source: source ethernet address |
| 48 | * @h_vlan_proto: ethernet protocol (always 0x8100) |
| 49 | * @h_vlan_TCI: priority and VLAN ID |
| 50 | * @h_vlan_encapsulated_proto: packet type ID or len |
| 51 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | struct vlan_ethhdr { |
Patrick McHardy | 740c15d | 2008-01-21 00:18:53 -0800 | [diff] [blame] | 53 | unsigned char h_dest[ETH_ALEN]; |
| 54 | unsigned char h_source[ETH_ALEN]; |
| 55 | __be16 h_vlan_proto; |
| 56 | __be16 h_vlan_TCI; |
| 57 | __be16 h_vlan_encapsulated_proto; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | }; |
| 59 | |
| 60 | #include <linux/skbuff.h> |
| 61 | |
| 62 | static inline struct vlan_ethhdr *vlan_eth_hdr(const struct sk_buff *skb) |
| 63 | { |
Arnaldo Carvalho de Melo | 98e399f | 2007-03-19 15:33:04 -0700 | [diff] [blame] | 64 | return (struct vlan_ethhdr *)skb_mac_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | } |
| 66 | |
Eric Dumazet | 05423b2 | 2009-10-26 18:40:35 -0700 | [diff] [blame] | 67 | #define VLAN_PRIO_MASK 0xe000 /* Priority Code Point */ |
| 68 | #define VLAN_PRIO_SHIFT 13 |
| 69 | #define VLAN_CFI_MASK 0x1000 /* Canonical Format Indicator */ |
| 70 | #define VLAN_TAG_PRESENT VLAN_CFI_MASK |
| 71 | #define VLAN_VID_MASK 0x0fff /* VLAN Identifier */ |
Jesse Gross | b738127 | 2010-10-20 13:56:02 +0000 | [diff] [blame] | 72 | #define VLAN_N_VID 4096 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | |
| 74 | /* found in socket.c */ |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 75 | extern void vlan_ioctl_set(int (*hook)(struct net *, void __user *)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | |
Jiri Pirko | 5b9ea6e | 2011-12-08 04:11:18 +0000 | [diff] [blame^] | 77 | struct vlan_info; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | |
Neil Horman | 6dcbbe2 | 2011-05-24 08:31:08 +0000 | [diff] [blame] | 79 | static inline int is_vlan_dev(struct net_device *dev) |
| 80 | { |
| 81 | return dev->priv_flags & IFF_802_1Q_VLAN; |
| 82 | } |
| 83 | |
Eric Dumazet | 05423b2 | 2009-10-26 18:40:35 -0700 | [diff] [blame] | 84 | #define vlan_tx_tag_present(__skb) ((__skb)->vlan_tci & VLAN_TAG_PRESENT) |
| 85 | #define vlan_tx_tag_get(__skb) ((__skb)->vlan_tci & ~VLAN_TAG_PRESENT) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | |
Patrick McHardy | 7750f40 | 2008-07-08 03:23:36 -0700 | [diff] [blame] | 87 | #if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE) |
Jesse Gross | 65ac6a5 | 2010-10-20 13:56:05 +0000 | [diff] [blame] | 88 | |
Jiri Pirko | cec9c13 | 2011-07-20 04:54:05 +0000 | [diff] [blame] | 89 | extern struct net_device *__vlan_find_dev_deep(struct net_device *real_dev, |
| 90 | u16 vlan_id); |
Patrick McHardy | 22d1ba7 | 2008-07-08 03:23:57 -0700 | [diff] [blame] | 91 | extern struct net_device *vlan_dev_real_dev(const struct net_device *dev); |
| 92 | extern u16 vlan_dev_vlan_id(const struct net_device *dev); |
| 93 | |
Eric Dumazet | 6a32e4f | 2011-10-29 06:13:39 +0000 | [diff] [blame] | 94 | extern bool vlan_do_receive(struct sk_buff **skb, bool last_handler); |
Jiri Pirko | bcc6d47 | 2011-04-07 19:48:33 +0000 | [diff] [blame] | 95 | extern struct sk_buff *vlan_untag(struct sk_buff *skb); |
Patrick McHardy | 9b22ea5 | 2008-11-04 14:49:57 -0800 | [diff] [blame] | 96 | |
Jiri Pirko | 87002b0 | 2011-12-08 04:11:17 +0000 | [diff] [blame] | 97 | extern int vlan_vid_add(struct net_device *dev, unsigned short vid); |
| 98 | extern void vlan_vid_del(struct net_device *dev, unsigned short vid); |
| 99 | |
Patrick McHardy | 7750f40 | 2008-07-08 03:23:36 -0700 | [diff] [blame] | 100 | #else |
Jiri Pirko | cec9c13 | 2011-07-20 04:54:05 +0000 | [diff] [blame] | 101 | static inline struct net_device * |
| 102 | __vlan_find_dev_deep(struct net_device *real_dev, u16 vlan_id) |
| 103 | { |
| 104 | return NULL; |
| 105 | } |
| 106 | |
Patrick McHardy | 22d1ba7 | 2008-07-08 03:23:57 -0700 | [diff] [blame] | 107 | static inline struct net_device *vlan_dev_real_dev(const struct net_device *dev) |
| 108 | { |
| 109 | BUG(); |
| 110 | return NULL; |
| 111 | } |
| 112 | |
| 113 | static inline u16 vlan_dev_vlan_id(const struct net_device *dev) |
| 114 | { |
| 115 | BUG(); |
| 116 | return 0; |
| 117 | } |
| 118 | |
Eric Dumazet | 6a32e4f | 2011-10-29 06:13:39 +0000 | [diff] [blame] | 119 | static inline bool vlan_do_receive(struct sk_buff **skb, bool last_handler) |
Patrick McHardy | 9b22ea5 | 2008-11-04 14:49:57 -0800 | [diff] [blame] | 120 | { |
Eric Dumazet | 6a32e4f | 2011-10-29 06:13:39 +0000 | [diff] [blame] | 121 | if (((*skb)->vlan_tci & VLAN_VID_MASK) && last_handler) |
Jesse Gross | 0988c4c | 2010-10-21 11:30:42 +0000 | [diff] [blame] | 122 | (*skb)->pkt_type = PACKET_OTHERHOST; |
Jesse Gross | 3701e51 | 2010-10-20 13:56:06 +0000 | [diff] [blame] | 123 | return false; |
Patrick McHardy | 9b22ea5 | 2008-11-04 14:49:57 -0800 | [diff] [blame] | 124 | } |
Herbert Xu | e1c096e | 2009-01-06 10:50:09 -0800 | [diff] [blame] | 125 | |
David S. Miller | 6139e75 | 2011-04-12 19:27:51 -0700 | [diff] [blame] | 126 | static inline struct sk_buff *vlan_untag(struct sk_buff *skb) |
Jiri Pirko | bcc6d47 | 2011-04-07 19:48:33 +0000 | [diff] [blame] | 127 | { |
| 128 | return skb; |
| 129 | } |
Jiri Pirko | 87002b0 | 2011-12-08 04:11:17 +0000 | [diff] [blame] | 130 | |
| 131 | static inline int vlan_vid_add(struct net_device *dev, unsigned short vid) |
| 132 | { |
| 133 | return 0; |
| 134 | } |
| 135 | |
| 136 | static inline void vlan_vid_del(struct net_device *dev, unsigned short vid) |
| 137 | { |
| 138 | } |
Patrick McHardy | 7750f40 | 2008-07-08 03:23:36 -0700 | [diff] [blame] | 139 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | |
Patrick McHardy | 9bb8582 | 2008-07-08 03:24:44 -0700 | [diff] [blame] | 141 | /** |
Jiri Pirko | 0b5c9db | 2011-06-10 06:56:58 +0000 | [diff] [blame] | 142 | * vlan_insert_tag - regular VLAN tag inserting |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 143 | * @skb: skbuff to tag |
Patrick McHardy | 9bb8582 | 2008-07-08 03:24:44 -0700 | [diff] [blame] | 144 | * @vlan_tci: VLAN TCI to insert |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 145 | * |
| 146 | * Inserts the VLAN tag into @skb as part of the payload |
| 147 | * Returns a VLAN tagged skb. If a new skb is created, @skb is freed. |
Patrick McHardy | 9bb8582 | 2008-07-08 03:24:44 -0700 | [diff] [blame] | 148 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | * Following the skb_unshare() example, in case of error, the calling function |
| 150 | * doesn't have to worry about freeing the original skb. |
Jiri Pirko | 0b5c9db | 2011-06-10 06:56:58 +0000 | [diff] [blame] | 151 | * |
| 152 | * Does not change skb->protocol so this function can be used during receive. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | */ |
Jiri Pirko | 0b5c9db | 2011-06-10 06:56:58 +0000 | [diff] [blame] | 154 | static inline struct sk_buff *vlan_insert_tag(struct sk_buff *skb, u16 vlan_tci) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | { |
| 156 | struct vlan_ethhdr *veth; |
| 157 | |
Patrick McHardy | 11a100f | 2008-07-08 15:36:57 -0700 | [diff] [blame] | 158 | if (skb_cow_head(skb, VLAN_HLEN) < 0) { |
| 159 | kfree_skb(skb); |
| 160 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 162 | veth = (struct vlan_ethhdr *)skb_push(skb, VLAN_HLEN); |
| 163 | |
| 164 | /* Move the mac addresses to the beginning of the new header. */ |
| 165 | memmove(skb->data, skb->data + VLAN_HLEN, 2 * VLAN_ETH_ALEN); |
Jarek Poplawski | e4dd618 | 2009-02-18 23:31:11 -0800 | [diff] [blame] | 166 | skb->mac_header -= VLAN_HLEN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 167 | |
| 168 | /* first, the ethernet type */ |
Patrick McHardy | 57d3ae8 | 2008-01-21 00:26:25 -0800 | [diff] [blame] | 169 | veth->h_vlan_proto = htons(ETH_P_8021Q); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 170 | |
Patrick McHardy | 9bb8582 | 2008-07-08 03:24:44 -0700 | [diff] [blame] | 171 | /* now, the TCI */ |
| 172 | veth->h_vlan_TCI = htons(vlan_tci); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | |
Jiri Pirko | 0b5c9db | 2011-06-10 06:56:58 +0000 | [diff] [blame] | 174 | return skb; |
| 175 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | |
Jiri Pirko | 0b5c9db | 2011-06-10 06:56:58 +0000 | [diff] [blame] | 177 | /** |
| 178 | * __vlan_put_tag - regular VLAN tag inserting |
| 179 | * @skb: skbuff to tag |
| 180 | * @vlan_tci: VLAN TCI to insert |
| 181 | * |
| 182 | * Inserts the VLAN tag into @skb as part of the payload |
| 183 | * Returns a VLAN tagged skb. If a new skb is created, @skb is freed. |
| 184 | * |
| 185 | * Following the skb_unshare() example, in case of error, the calling function |
| 186 | * doesn't have to worry about freeing the original skb. |
| 187 | */ |
| 188 | static inline struct sk_buff *__vlan_put_tag(struct sk_buff *skb, u16 vlan_tci) |
| 189 | { |
| 190 | skb = vlan_insert_tag(skb, vlan_tci); |
| 191 | if (skb) |
| 192 | skb->protocol = htons(ETH_P_8021Q); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 193 | return skb; |
| 194 | } |
| 195 | |
| 196 | /** |
| 197 | * __vlan_hwaccel_put_tag - hardware accelerated VLAN inserting |
| 198 | * @skb: skbuff to tag |
Patrick McHardy | 9bb8582 | 2008-07-08 03:24:44 -0700 | [diff] [blame] | 199 | * @vlan_tci: VLAN TCI to insert |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 200 | * |
Patrick McHardy | 6aa895b0 | 2008-07-14 22:49:06 -0700 | [diff] [blame] | 201 | * Puts the VLAN TCI in @skb->vlan_tci and lets the device do the rest |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 202 | */ |
Patrick McHardy | 9bb8582 | 2008-07-08 03:24:44 -0700 | [diff] [blame] | 203 | static inline struct sk_buff *__vlan_hwaccel_put_tag(struct sk_buff *skb, |
| 204 | u16 vlan_tci) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 205 | { |
Eric Dumazet | 05423b2 | 2009-10-26 18:40:35 -0700 | [diff] [blame] | 206 | skb->vlan_tci = VLAN_TAG_PRESENT | vlan_tci; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 207 | return skb; |
| 208 | } |
| 209 | |
| 210 | #define HAVE_VLAN_PUT_TAG |
| 211 | |
| 212 | /** |
| 213 | * vlan_put_tag - inserts VLAN tag according to device features |
| 214 | * @skb: skbuff to tag |
Patrick McHardy | 9bb8582 | 2008-07-08 03:24:44 -0700 | [diff] [blame] | 215 | * @vlan_tci: VLAN TCI to insert |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | * |
| 217 | * Assumes skb->dev is the target that will xmit this frame. |
| 218 | * Returns a VLAN tagged skb. |
| 219 | */ |
Patrick McHardy | 9bb8582 | 2008-07-08 03:24:44 -0700 | [diff] [blame] | 220 | static inline struct sk_buff *vlan_put_tag(struct sk_buff *skb, u16 vlan_tci) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 221 | { |
| 222 | if (skb->dev->features & NETIF_F_HW_VLAN_TX) { |
Patrick McHardy | 9bb8582 | 2008-07-08 03:24:44 -0700 | [diff] [blame] | 223 | return __vlan_hwaccel_put_tag(skb, vlan_tci); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 224 | } else { |
Patrick McHardy | 9bb8582 | 2008-07-08 03:24:44 -0700 | [diff] [blame] | 225 | return __vlan_put_tag(skb, vlan_tci); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 226 | } |
| 227 | } |
| 228 | |
| 229 | /** |
| 230 | * __vlan_get_tag - get the VLAN ID that is part of the payload |
| 231 | * @skb: skbuff to query |
Patrick McHardy | 9bb8582 | 2008-07-08 03:24:44 -0700 | [diff] [blame] | 232 | * @vlan_tci: buffer to store vlaue |
| 233 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 234 | * Returns error if the skb is not of VLAN type |
| 235 | */ |
Patrick McHardy | 9bb8582 | 2008-07-08 03:24:44 -0700 | [diff] [blame] | 236 | static inline int __vlan_get_tag(const struct sk_buff *skb, u16 *vlan_tci) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 237 | { |
| 238 | struct vlan_ethhdr *veth = (struct vlan_ethhdr *)skb->data; |
| 239 | |
Patrick McHardy | 57d3ae8 | 2008-01-21 00:26:25 -0800 | [diff] [blame] | 240 | if (veth->h_vlan_proto != htons(ETH_P_8021Q)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 241 | return -EINVAL; |
| 242 | } |
| 243 | |
Patrick McHardy | 9bb8582 | 2008-07-08 03:24:44 -0700 | [diff] [blame] | 244 | *vlan_tci = ntohs(veth->h_vlan_TCI); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 245 | return 0; |
| 246 | } |
| 247 | |
| 248 | /** |
| 249 | * __vlan_hwaccel_get_tag - get the VLAN ID that is in @skb->cb[] |
| 250 | * @skb: skbuff to query |
Patrick McHardy | 9bb8582 | 2008-07-08 03:24:44 -0700 | [diff] [blame] | 251 | * @vlan_tci: buffer to store vlaue |
| 252 | * |
Patrick McHardy | 6aa895b0 | 2008-07-14 22:49:06 -0700 | [diff] [blame] | 253 | * Returns error if @skb->vlan_tci is not set correctly |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 254 | */ |
Patrick McHardy | 1814993 | 2008-02-05 16:20:22 -0800 | [diff] [blame] | 255 | static inline int __vlan_hwaccel_get_tag(const struct sk_buff *skb, |
Patrick McHardy | 9bb8582 | 2008-07-08 03:24:44 -0700 | [diff] [blame] | 256 | u16 *vlan_tci) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 257 | { |
Patrick McHardy | 6aa895b0 | 2008-07-14 22:49:06 -0700 | [diff] [blame] | 258 | if (vlan_tx_tag_present(skb)) { |
Eric Dumazet | 05423b2 | 2009-10-26 18:40:35 -0700 | [diff] [blame] | 259 | *vlan_tci = vlan_tx_tag_get(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 260 | return 0; |
| 261 | } else { |
Patrick McHardy | 9bb8582 | 2008-07-08 03:24:44 -0700 | [diff] [blame] | 262 | *vlan_tci = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 263 | return -EINVAL; |
| 264 | } |
| 265 | } |
| 266 | |
| 267 | #define HAVE_VLAN_GET_TAG |
| 268 | |
| 269 | /** |
| 270 | * vlan_get_tag - get the VLAN ID from the skb |
| 271 | * @skb: skbuff to query |
Patrick McHardy | 9bb8582 | 2008-07-08 03:24:44 -0700 | [diff] [blame] | 272 | * @vlan_tci: buffer to store vlaue |
| 273 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 274 | * Returns error if the skb is not VLAN tagged |
| 275 | */ |
Patrick McHardy | 9bb8582 | 2008-07-08 03:24:44 -0700 | [diff] [blame] | 276 | static inline int vlan_get_tag(const struct sk_buff *skb, u16 *vlan_tci) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 277 | { |
| 278 | if (skb->dev->features & NETIF_F_HW_VLAN_TX) { |
Patrick McHardy | 9bb8582 | 2008-07-08 03:24:44 -0700 | [diff] [blame] | 279 | return __vlan_hwaccel_get_tag(skb, vlan_tci); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 280 | } else { |
Patrick McHardy | 9bb8582 | 2008-07-08 03:24:44 -0700 | [diff] [blame] | 281 | return __vlan_get_tag(skb, vlan_tci); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 282 | } |
| 283 | } |
| 284 | |
Hao Zheng | 0a85df0 | 2010-11-11 13:47:57 +0000 | [diff] [blame] | 285 | /** |
| 286 | * vlan_get_protocol - get protocol EtherType. |
| 287 | * @skb: skbuff to query |
| 288 | * |
| 289 | * Returns the EtherType of the packet, regardless of whether it is |
| 290 | * vlan encapsulated (normal or hardware accelerated) or not. |
| 291 | */ |
| 292 | static inline __be16 vlan_get_protocol(const struct sk_buff *skb) |
| 293 | { |
| 294 | __be16 protocol = 0; |
| 295 | |
| 296 | if (vlan_tx_tag_present(skb) || |
| 297 | skb->protocol != cpu_to_be16(ETH_P_8021Q)) |
| 298 | protocol = skb->protocol; |
| 299 | else { |
| 300 | __be16 proto, *protop; |
| 301 | protop = skb_header_pointer(skb, offsetof(struct vlan_ethhdr, |
| 302 | h_vlan_encapsulated_proto), |
| 303 | sizeof(proto), &proto); |
| 304 | if (likely(protop)) |
| 305 | protocol = *protop; |
| 306 | } |
| 307 | |
| 308 | return protocol; |
| 309 | } |
Pravin B Shelar | 396cf94 | 2011-11-18 13:15:54 -0800 | [diff] [blame] | 310 | |
| 311 | static inline void vlan_set_encap_proto(struct sk_buff *skb, |
| 312 | struct vlan_hdr *vhdr) |
| 313 | { |
| 314 | __be16 proto; |
| 315 | unsigned char *rawp; |
| 316 | |
| 317 | /* |
| 318 | * Was a VLAN packet, grab the encapsulated protocol, which the layer |
| 319 | * three protocols care about. |
| 320 | */ |
| 321 | |
| 322 | proto = vhdr->h_vlan_encapsulated_proto; |
| 323 | if (ntohs(proto) >= 1536) { |
| 324 | skb->protocol = proto; |
| 325 | return; |
| 326 | } |
| 327 | |
| 328 | rawp = skb->data; |
| 329 | if (*(unsigned short *) rawp == 0xFFFF) |
| 330 | /* |
| 331 | * This is a magic hack to spot IPX packets. Older Novell |
| 332 | * breaks the protocol design and runs IPX over 802.3 without |
| 333 | * an 802.2 LLC layer. We look for FFFF which isn't a used |
| 334 | * 802.2 SSAP/DSAP. This won't work for fault tolerant netware |
| 335 | * but does for the rest. |
| 336 | */ |
| 337 | skb->protocol = htons(ETH_P_802_3); |
| 338 | else |
| 339 | /* |
| 340 | * Real 802.2 LLC |
| 341 | */ |
| 342 | skb->protocol = htons(ETH_P_802_2); |
| 343 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 344 | #endif /* __KERNEL__ */ |
| 345 | |
| 346 | /* VLAN IOCTLs are found in sockios.h */ |
| 347 | |
| 348 | /* Passed in vlan_ioctl_args structure to determine behaviour. */ |
| 349 | enum vlan_ioctl_cmds { |
| 350 | ADD_VLAN_CMD, |
| 351 | DEL_VLAN_CMD, |
| 352 | SET_VLAN_INGRESS_PRIORITY_CMD, |
| 353 | SET_VLAN_EGRESS_PRIORITY_CMD, |
| 354 | GET_VLAN_INGRESS_PRIORITY_CMD, |
| 355 | GET_VLAN_EGRESS_PRIORITY_CMD, |
| 356 | SET_VLAN_NAME_TYPE_CMD, |
| 357 | SET_VLAN_FLAG_CMD, |
| 358 | GET_VLAN_REALDEV_NAME_CMD, /* If this works, you know it's a VLAN device, btw */ |
| 359 | GET_VLAN_VID_CMD /* Get the VID of this VLAN (specified by name) */ |
| 360 | }; |
| 361 | |
Patrick McHardy | a4bf3af4 | 2007-06-13 12:07:37 -0700 | [diff] [blame] | 362 | enum vlan_flags { |
| 363 | VLAN_FLAG_REORDER_HDR = 0x1, |
Patrick McHardy | 70c03b4 | 2008-07-05 21:26:57 -0700 | [diff] [blame] | 364 | VLAN_FLAG_GVRP = 0x2, |
Patrick McHardy | 5e75659 | 2009-11-25 07:54:54 +0000 | [diff] [blame] | 365 | VLAN_FLAG_LOOSE_BINDING = 0x4, |
Patrick McHardy | a4bf3af4 | 2007-06-13 12:07:37 -0700 | [diff] [blame] | 366 | }; |
| 367 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 368 | enum vlan_name_types { |
| 369 | VLAN_NAME_TYPE_PLUS_VID, /* Name will look like: vlan0005 */ |
| 370 | VLAN_NAME_TYPE_RAW_PLUS_VID, /* name will look like: eth1.0005 */ |
| 371 | VLAN_NAME_TYPE_PLUS_VID_NO_PAD, /* Name will look like: vlan5 */ |
| 372 | VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD, /* Name will look like: eth0.5 */ |
| 373 | VLAN_NAME_TYPE_HIGHEST |
| 374 | }; |
| 375 | |
| 376 | struct vlan_ioctl_args { |
| 377 | int cmd; /* Should be one of the vlan_ioctl_cmds enum above. */ |
| 378 | char device1[24]; |
| 379 | |
| 380 | union { |
| 381 | char device2[24]; |
| 382 | int VID; |
| 383 | unsigned int skb_priority; |
| 384 | unsigned int name_type; |
| 385 | unsigned int bind_type; |
Jiri Pirko | 7da82c0 | 2011-12-08 04:11:15 +0000 | [diff] [blame] | 386 | unsigned int flag; /* Matches vlan_dev_priv flags */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 387 | } u; |
| 388 | |
| 389 | short vlan_qos; |
| 390 | }; |
| 391 | |
| 392 | #endif /* !(_LINUX_IF_VLAN_H_) */ |