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__ 17 18/* externally defined structs */ 19struct vlan_group; 20struct net_device; 21struct sk_buff; 22struct packet_type; 23struct vlan_collection; 24struct vlan_dev_info; 25 26#include <linux/proc_fs.h> /* for proc_dir_entry */ 27#include <linux/netdevice.h> 28 29#define VLAN_HLEN 4 /* The additional bytes (on top of the Ethernet header) 30 * that VLAN requires. 31 */ 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 */ 35 36/* 37 * According to 802.3ac, the packet can be 4 bytes longer. --Klika Jan 38 */ 39#define VLAN_ETH_DATA_LEN 1500 /* Max. octets in payload */ 40#define VLAN_ETH_FRAME_LEN 1518 /* Max. octets in frame sans FCS */ 41 42struct vlan_ethhdr { 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) */ 48}; 49 50struct vlan_hdr { 51 unsigned short h_vlan_TCI; /* Encapsulates priority and VLAN ID */ 52 unsigned short h_vlan_encapsulated_proto; /* packet type ID field (or len) */ 53}; 54 55#define VLAN_VID_MASK 0xfff 56 57/* found in af_inet.c */ 58extern int (*vlan_ioctl_hook)(unsigned long arg); 59 60#define VLAN_NAME "vlan" 61 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. 65 */ 66#define VLAN_GROUP_ARRAY_LEN 4096 67 68struct vlan_group { 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]; 71 72 struct vlan_group *next; /* the next in the list */ 73}; 74 75struct 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) 80 */ 81 struct vlan_priority_tci_mapping *next; 82}; 83 84/* Holds information that makes sense if this device is a VLAN device. */ 85struct vlan_dev_info { 86 /** This will be the mapping that correlates skb->priority to 87 * 3 bits of VLAN QOS tags... 88 */ 89 unsigned long ingress_priority_map[8]; 90 struct vlan_priority_tci_mapping *egress_priority_map[16]; /* hash table */ 91 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 99 * 802.1Q 100 */ 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... 105 */ 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...) */ 113}; 114 115#define VLAN_DEV_INFO(x) ((struct vlan_dev_info *)(x->priv)) 116 117/* inline functions */ 118 119static inline struct net_device_stats *vlan_dev_get_stats(struct net_device *dev) 120{ 121 return &(VLAN_DEV_INFO(dev)->dev_stats); 122} 123 124static inline __u32 vlan_get_ingress_priority(struct net_device *dev, 125 unsigned short vlan_tag) 126{ 127 struct vlan_dev_info *vip = VLAN_DEV_INFO(dev); 128 129 return vip->ingress_priority_map[(vlan_tag >> 13) & 0x7]; 130} 131 132/* VLAN tx hw acceleration helpers. */ 133struct vlan_skb_tx_cookie { 134 u32 magic; 135 u32 vlan_tag; 136}; 137 138#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) 143 144/* VLAN rx hw acceleration helper. This acts like netif_{rx,receive_skb}(). */ 145static inline int __vlan_hwaccel_rx(struct sk_buff *skb, 146 struct vlan_group *grp, 147 unsigned short vlan_tag, int polling) 148{ 149 struct net_device_stats *stats; 150 151 skb->dev = grp->vlan_devices[vlan_tag & VLAN_VID_MASK]; 152 if (skb->dev == NULL) { 153 kfree_skb(skb); 154 155 /* Not NET_RX_DROP, this is not being dropped 156 * due to congestion. 157 */ 158 return 0; 159 } 160 161 skb->dev->last_rx = jiffies; 162 163 stats = vlan_dev_get_stats(skb->dev); 164 stats->rx_packets++; 165 stats->rx_bytes += skb->len; 166 167 skb->priority = vlan_get_ingress_priority(skb->dev, vlan_tag); 168 switch (skb->pkt_type) { 169 case PACKET_BROADCAST: 170 break; 171 172 case PACKET_MULTICAST: 173 stats->multicast++; 174 break; 175 176 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. 180 */ 181 if (!memcmp(skb->mac.ethernet->h_dest, skb->dev->dev_addr, ETH_ALEN)) 182 skb->pkt_type = PACKET_HOST; 183 break; 184 }; 185 186 return (polling ? netif_receive_skb(skb) : netif_rx(skb)); 187} 188 189static inline int vlan_hwaccel_rx(struct sk_buff *skb, 190 struct vlan_group *grp, 191 unsigned short vlan_tag) 192{ 193 return __vlan_hwaccel_rx(skb, grp, vlan_tag, 0); 194} 195 196static inline int vlan_hwaccel_receive_skb(struct sk_buff *skb, 197 struct vlan_group *grp, 198 unsigned short vlan_tag) 199{ 200 return __vlan_hwaccel_rx(skb, grp, vlan_tag, 1); 201} 202#endif /* __KERNEL__ */ 203 204/* VLAN IOCTLs are found in sockios.h */ 205 206/* Passed in vlan_ioctl_args structure to determine behaviour. */ 207enum vlan_ioctl_cmds { 208 ADD_VLAN_CMD, 209 DEL_VLAN_CMD, 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, 215 SET_VLAN_FLAG_CMD 216}; 217 218enum 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 224}; 225 226struct vlan_ioctl_args { 227 int cmd; /* Should be one of the vlan_ioctl_cmds enum above. */ 228 char device1[24]; 229 230 union { 231 char device2[24]; 232 int VID; 233 unsigned int skb_priority; 234 unsigned int name_type; 235 unsigned int bind_type; 236 unsigned int flag; /* Matches vlan_dev_info flags */ 237 } u; 238 239 short vlan_qos; 240}; 241 242#endif /* !(_LINUX_IF_VLAN_H_) */ 243