2 * VLAN An implementation of 802.1Q VLAN tagging.
4 * Authors: Ben Greear <greearb@candelatech.com>
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.
13 #ifndef _LINUX_IF_VLAN_H_
14 #define _LINUX_IF_VLAN_H_
18 /* externally defined structs */
23 struct vlan_collection;
26 #include <linux/proc_fs.h> /* for proc_dir_entry */
27 #include <linux/netdevice.h>
29 #define VLAN_HLEN 4 /* The additional bytes (on top of the Ethernet header)
32 #define VLAN_ETH_ALEN 6 /* Octets in one ethernet addr */
33 #define VLAN_ETH_HLEN 18 /* Total octets in header. */
34 #define VLAN_ETH_ZLEN 64 /* Min. octets in frame sans FCS */
37 * According to 802.3ac, the packet can be 4 bytes longer. --Klika Jan
39 #define VLAN_ETH_DATA_LEN 1500 /* Max. octets in payload */
40 #define VLAN_ETH_FRAME_LEN 1518 /* Max. octets in frame sans FCS */
43 unsigned char h_dest[ETH_ALEN]; /* destination eth addr */
44 unsigned char h_source[ETH_ALEN]; /* source ether addr */
45 unsigned short h_vlan_proto; /* Should always be 0x8100 */
46 unsigned short h_vlan_TCI; /* Encapsulates priority and VLAN ID */
47 unsigned short h_vlan_encapsulated_proto; /* packet type ID field (or len) */
51 unsigned short h_vlan_TCI; /* Encapsulates priority and VLAN ID */
52 unsigned short h_vlan_encapsulated_proto; /* packet type ID field (or len) */
55 #define VLAN_VID_MASK 0xfff
57 /* found in af_inet.c */
58 extern int (*vlan_ioctl_hook)(unsigned long arg);
60 #define VLAN_NAME "vlan"
62 /* if this changes, algorithm will have to be reworked because this
63 * depends on completely exhausting the VLAN identifier space. Thus
64 * it gives constant time look-up, but in many cases it wastes memory.
66 #define VLAN_GROUP_ARRAY_LEN 4096
69 int real_dev_ifindex; /* The ifindex of the ethernet(like) device the vlan is attached to. */
70 struct net_device *vlan_devices[VLAN_GROUP_ARRAY_LEN];
72 struct vlan_group *next; /* the next in the list */
75 struct vlan_priority_tci_mapping {
76 unsigned long priority;
77 unsigned short vlan_qos; /* This should be shifted when first set, so we only do it
78 * at provisioning time.
79 * ((skb->priority << 13) & 0xE000)
81 struct vlan_priority_tci_mapping *next;
84 /* Holds information that makes sense if this device is a VLAN device. */
85 struct vlan_dev_info {
86 /** This will be the mapping that correlates skb->priority to
87 * 3 bits of VLAN QOS tags...
89 unsigned long ingress_priority_map[8];
90 struct vlan_priority_tci_mapping *egress_priority_map[16]; /* hash table */
92 unsigned short vlan_id; /* The VLAN Identifier for this interface. */
93 unsigned short flags; /* (1 << 0) re_order_header This option will cause the
94 * VLAN code to move around the ethernet header on
95 * ingress to make the skb look **exactly** like it
96 * came in from an ethernet port. This destroys some of
97 * the VLAN information in the skb, but it fixes programs
98 * like DHCP that use packet-filtering and don't understand
101 struct dev_mc_list *old_mc_list; /* old multi-cast list for the VLAN interface..
102 * we save this so we can tell what changes were
103 * made, in order to feed the right changes down
104 * to the real hardware...
106 int old_allmulti; /* similar to above. */
107 int old_promiscuity; /* similar to above. */
108 struct net_device *real_dev; /* the underlying device/interface */
109 struct proc_dir_entry *dent; /* Holds the proc data */
110 unsigned long cnt_inc_headroom_on_tx; /* How many times did we have to grow the skb on TX. */
111 unsigned long cnt_encap_on_xmit; /* How many times did we have to encapsulate the skb on TX. */
112 struct net_device_stats dev_stats; /* Device stats (rx-bytes, tx-pkts, etc...) */
115 #define VLAN_DEV_INFO(x) ((struct vlan_dev_info *)(x->priv))
117 /* inline functions */
119 static inline struct net_device_stats *vlan_dev_get_stats(struct net_device *dev)
121 return &(VLAN_DEV_INFO(dev)->dev_stats);
124 static inline __u32 vlan_get_ingress_priority(struct net_device *dev,
125 unsigned short vlan_tag)
127 struct vlan_dev_info *vip = VLAN_DEV_INFO(dev);
129 return vip->ingress_priority_map[(vlan_tag >> 13) & 0x7];
132 /* VLAN tx hw acceleration helpers. */
133 struct vlan_skb_tx_cookie {
138 #define VLAN_TX_COOKIE_MAGIC 0x564c414e /* "VLAN" in ascii. */
139 #define VLAN_TX_SKB_CB(__skb) ((struct vlan_skb_tx_cookie *)&((__skb)->cb[0]))
140 #define vlan_tx_tag_present(__skb) \
141 (VLAN_TX_SKB_CB(__skb)->magic == VLAN_TX_COOKIE_MAGIC)
142 #define vlan_tx_tag_get(__skb) (VLAN_TX_SKB_CB(__skb)->vlan_tag)
144 /* VLAN rx hw acceleration helper. This acts like netif_{rx,receive_skb}(). */
145 static inline int __vlan_hwaccel_rx(struct sk_buff *skb,
146 struct vlan_group *grp,
147 unsigned short vlan_tag, int polling)
149 struct net_device_stats *stats;
151 skb->dev = grp->vlan_devices[vlan_tag & VLAN_VID_MASK];
152 if (skb->dev == NULL) {
155 /* Not NET_RX_DROP, this is not being dropped
161 skb->dev->last_rx = jiffies;
163 stats = vlan_dev_get_stats(skb->dev);
165 stats->rx_bytes += skb->len;
167 skb->priority = vlan_get_ingress_priority(skb->dev, vlan_tag);
168 switch (skb->pkt_type) {
169 case PACKET_BROADCAST:
172 case PACKET_MULTICAST:
176 case PACKET_OTHERHOST:
177 /* Our lower layer thinks this is not local, let's make sure.
178 * This allows the VLAN to have a different MAC than the underlying
179 * device, and still route correctly.
181 if (!memcmp(skb->mac.ethernet->h_dest, skb->dev->dev_addr, ETH_ALEN))
182 skb->pkt_type = PACKET_HOST;
186 return (polling ? netif_receive_skb(skb) : netif_rx(skb));
189 static inline int vlan_hwaccel_rx(struct sk_buff *skb,
190 struct vlan_group *grp,
191 unsigned short vlan_tag)
193 return __vlan_hwaccel_rx(skb, grp, vlan_tag, 0);
196 static inline int vlan_hwaccel_receive_skb(struct sk_buff *skb,
197 struct vlan_group *grp,
198 unsigned short vlan_tag)
200 return __vlan_hwaccel_rx(skb, grp, vlan_tag, 1);
202 #endif /* __KERNEL__ */
204 /* VLAN IOCTLs are found in sockios.h */
206 /* Passed in vlan_ioctl_args structure to determine behaviour. */
207 enum vlan_ioctl_cmds {
210 SET_VLAN_INGRESS_PRIORITY_CMD,
211 SET_VLAN_EGRESS_PRIORITY_CMD,
212 GET_VLAN_INGRESS_PRIORITY_CMD,
213 GET_VLAN_EGRESS_PRIORITY_CMD,
214 SET_VLAN_NAME_TYPE_CMD,
218 enum vlan_name_types {
219 VLAN_NAME_TYPE_PLUS_VID, /* Name will look like: vlan0005 */
220 VLAN_NAME_TYPE_RAW_PLUS_VID, /* name will look like: eth1.0005 */
221 VLAN_NAME_TYPE_PLUS_VID_NO_PAD, /* Name will look like: vlan5 */
222 VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD, /* Name will look like: eth0.5 */
223 VLAN_NAME_TYPE_HIGHEST
226 struct vlan_ioctl_args {
227 int cmd; /* Should be one of the vlan_ioctl_cmds enum above. */
233 unsigned int skb_priority;
234 unsigned int name_type;
235 unsigned int bind_type;
236 unsigned int flag; /* Matches vlan_dev_info flags */
242 #endif /* !(_LINUX_IF_VLAN_H_) */