| /* |
| * VLAN An implementation of 802.1Q VLAN tagging. |
| * |
| * Authors: Ben Greear <greearb@candelatech.com> |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License |
| * as published by the Free Software Foundation; either version |
| * 2 of the License, or (at your option) any later version. |
| * |
| */ |
| |
| #ifndef _LINUX_IF_VLAN_H_ |
| #define _LINUX_IF_VLAN_H_ |
| |
| #ifdef __KERNEL__ |
| |
| /* externally defined structs */ |
| struct vlan_group; |
| struct net_device; |
| struct packet_type; |
| struct vlan_collection; |
| struct vlan_dev_info; |
| struct hlist_node; |
| |
| #include <linux/netdevice.h> |
| #include <linux/etherdevice.h> |
| |
| #define VLAN_HLEN 4 /* The additional bytes (on top of the Ethernet header) |
| * that VLAN requires. |
| */ |
| #define VLAN_ETH_ALEN 6 /* Octets in one ethernet addr */ |
| #define VLAN_ETH_HLEN 18 /* Total octets in header. */ |
| #define VLAN_ETH_ZLEN 64 /* Min. octets in frame sans FCS */ |
| |
| /* |
| * According to 802.3ac, the packet can be 4 bytes longer. --Klika Jan |
| */ |
| #define VLAN_ETH_DATA_LEN 1500 /* Max. octets in payload */ |
| #define VLAN_ETH_FRAME_LEN 1518 /* Max. octets in frame sans FCS */ |
| |
| struct vlan_ethhdr { |
| unsigned char h_dest[ETH_ALEN]; /* destination eth addr */ |
| unsigned char h_source[ETH_ALEN]; /* source ether addr */ |
| __be16 h_vlan_proto; /* Should always be 0x8100 */ |
| __be16 h_vlan_TCI; /* Encapsulates priority and VLAN ID */ |
| __be16 h_vlan_encapsulated_proto; /* packet type ID field (or len) */ |
| }; |
| |
| #include <linux/skbuff.h> |
| |
| static inline struct vlan_ethhdr *vlan_eth_hdr(const struct sk_buff *skb) |
| { |
| return (struct vlan_ethhdr *)skb_mac_header(skb); |
| } |
| |
| struct vlan_hdr { |
| __be16 h_vlan_TCI; /* Encapsulates priority and VLAN ID */ |
| __be16 h_vlan_encapsulated_proto; /* packet type ID field (or len) */ |
| }; |
| |
| #define VLAN_VID_MASK 0xfff |
| |
| /* found in socket.c */ |
| extern void vlan_ioctl_set(int (*hook)(void __user *)); |
| |
| #define VLAN_NAME "vlan" |
| |
| /* if this changes, algorithm will have to be reworked because this |
| * depends on completely exhausting the VLAN identifier space. Thus |
| * it gives constant time look-up, but in many cases it wastes memory. |
| */ |
| #define VLAN_GROUP_ARRAY_LEN 4096 |
| #define VLAN_GROUP_ARRAY_SPLIT_PARTS 8 |
| #define VLAN_GROUP_ARRAY_PART_LEN (VLAN_GROUP_ARRAY_LEN/VLAN_GROUP_ARRAY_SPLIT_PARTS) |
| |
| struct vlan_group { |
| int real_dev_ifindex; /* The ifindex of the ethernet(like) device the vlan is attached to. */ |
| struct hlist_node hlist; /* linked list */ |
| struct net_device **vlan_devices_arrays[VLAN_GROUP_ARRAY_SPLIT_PARTS]; |
| struct rcu_head rcu; |
| }; |
| |
| static inline struct net_device *vlan_group_get_device(struct vlan_group *vg, int vlan_id) |
| { |
| struct net_device **array; |
| array = vg->vlan_devices_arrays[vlan_id / VLAN_GROUP_ARRAY_PART_LEN]; |
| return array[vlan_id % VLAN_GROUP_ARRAY_PART_LEN]; |
| } |
| |
| static inline void vlan_group_set_device(struct vlan_group *vg, int vlan_id, |
| struct net_device *dev) |
| { |
| struct net_device **array; |
| if (!vg) |
| return; |
| array = vg->vlan_devices_arrays[vlan_id / VLAN_GROUP_ARRAY_PART_LEN]; |
| array[vlan_id % VLAN_GROUP_ARRAY_PART_LEN] = dev; |
| } |
| |
| struct vlan_priority_tci_mapping { |
| u32 priority; |
| unsigned short vlan_qos; /* This should be shifted when first set, so we only do it |
| * at provisioning time. |
| * ((skb->priority << 13) & 0xE000) |
| */ |
| struct vlan_priority_tci_mapping *next; |
| }; |
| |
| /* Holds information that makes sense if this device is a VLAN device. */ |
| struct vlan_dev_info { |
| /** This will be the mapping that correlates skb->priority to |
| * 3 bits of VLAN QOS tags... |
| */ |
| unsigned int nr_ingress_mappings; |
| u32 ingress_priority_map[8]; |
| |
| unsigned int nr_egress_mappings; |
| struct vlan_priority_tci_mapping *egress_priority_map[16]; /* hash table */ |
| |
| unsigned short vlan_id; /* The VLAN Identifier for this interface. */ |
| unsigned short flags; /* (1 << 0) re_order_header This option will cause the |
| * VLAN code to move around the ethernet header on |
| * ingress to make the skb look **exactly** like it |
| * came in from an ethernet port. This destroys some of |
| * the VLAN information in the skb, but it fixes programs |
| * like DHCP that use packet-filtering and don't understand |
| * 802.1Q |
| */ |
| struct dev_mc_list *old_mc_list; /* old multi-cast list for the VLAN interface.. |
| * we save this so we can tell what changes were |
| * made, in order to feed the right changes down |
| * to the real hardware... |
| */ |
| int old_allmulti; /* similar to above. */ |
| int old_promiscuity; /* similar to above. */ |
| struct net_device *real_dev; /* the underlying device/interface */ |
| struct proc_dir_entry *dent; /* Holds the proc data */ |
| unsigned long cnt_inc_headroom_on_tx; /* How many times did we have to grow the skb on TX. */ |
| unsigned long cnt_encap_on_xmit; /* How many times did we have to encapsulate the skb on TX. */ |
| struct net_device_stats dev_stats; /* Device stats (rx-bytes, tx-pkts, etc...) */ |
| }; |
| |
| #define VLAN_DEV_INFO(x) ((struct vlan_dev_info *)(x->priv)) |
| |
| /* inline functions */ |
| |
| static inline struct net_device_stats *vlan_dev_get_stats(struct net_device *dev) |
| { |
| return &(VLAN_DEV_INFO(dev)->dev_stats); |
| } |
| |
| static inline __u32 vlan_get_ingress_priority(struct net_device *dev, |
| unsigned short vlan_tag) |
| { |
| struct vlan_dev_info *vip = VLAN_DEV_INFO(dev); |
| |
| return vip->ingress_priority_map[(vlan_tag >> 13) & 0x7]; |
| } |
| |
| /* VLAN tx hw acceleration helpers. */ |
| struct vlan_skb_tx_cookie { |
| u32 magic; |
| u32 vlan_tag; |
| }; |
| |
| #define VLAN_TX_COOKIE_MAGIC 0x564c414e /* "VLAN" in ascii. */ |
| #define VLAN_TX_SKB_CB(__skb) ((struct vlan_skb_tx_cookie *)&((__skb)->cb[0])) |
| #define vlan_tx_tag_present(__skb) \ |
| (VLAN_TX_SKB_CB(__skb)->magic == VLAN_TX_COOKIE_MAGIC) |
| #define vlan_tx_tag_get(__skb) (VLAN_TX_SKB_CB(__skb)->vlan_tag) |
| |
| /* VLAN rx hw acceleration helper. This acts like netif_{rx,receive_skb}(). */ |
| static inline int __vlan_hwaccel_rx(struct sk_buff *skb, |
| struct vlan_group *grp, |
| unsigned short vlan_tag, int polling) |
| { |
| struct net_device_stats *stats; |
| |
| if (skb_bond_should_drop(skb)) { |
| dev_kfree_skb_any(skb); |
| return NET_RX_DROP; |
| } |
| |
| skb->dev = vlan_group_get_device(grp, vlan_tag & VLAN_VID_MASK); |
| if (skb->dev == NULL) { |
| dev_kfree_skb_any(skb); |
| |
| /* Not NET_RX_DROP, this is not being dropped |
| * due to congestion. |
| */ |
| return 0; |
| } |
| |
| skb->dev->last_rx = jiffies; |
| |
| stats = vlan_dev_get_stats(skb->dev); |
| stats->rx_packets++; |
| stats->rx_bytes += skb->len; |
| |
| skb->priority = vlan_get_ingress_priority(skb->dev, vlan_tag); |
| switch (skb->pkt_type) { |
| case PACKET_BROADCAST: |
| break; |
| |
| case PACKET_MULTICAST: |
| stats->multicast++; |
| break; |
| |
| case PACKET_OTHERHOST: |
| /* Our lower layer thinks this is not local, let's make sure. |
| * This allows the VLAN to have a different MAC than the underlying |
| * device, and still route correctly. |
| */ |
| if (!compare_ether_addr(eth_hdr(skb)->h_dest, |
| skb->dev->dev_addr)) |
| skb->pkt_type = PACKET_HOST; |
| break; |
| }; |
| |
| return (polling ? netif_receive_skb(skb) : netif_rx(skb)); |
| } |
| |
| static inline int vlan_hwaccel_rx(struct sk_buff *skb, |
| struct vlan_group *grp, |
| unsigned short vlan_tag) |
| { |
| return __vlan_hwaccel_rx(skb, grp, vlan_tag, 0); |
| } |
| |
| static inline int vlan_hwaccel_receive_skb(struct sk_buff *skb, |
| struct vlan_group *grp, |
| unsigned short vlan_tag) |
| { |
| return __vlan_hwaccel_rx(skb, grp, vlan_tag, 1); |
| } |
| |
| /** |
| * __vlan_put_tag - regular VLAN tag inserting |
| * @skb: skbuff to tag |
| * @tag: VLAN tag to insert |
| * |
| * Inserts the VLAN tag into @skb as part of the payload |
| * Returns a VLAN tagged skb. If a new skb is created, @skb is freed. |
| * |
| * Following the skb_unshare() example, in case of error, the calling function |
| * doesn't have to worry about freeing the original skb. |
| */ |
| static inline struct sk_buff *__vlan_put_tag(struct sk_buff *skb, unsigned short tag) |
| { |
| struct vlan_ethhdr *veth; |
| |
| if (skb_headroom(skb) < VLAN_HLEN) { |
| struct sk_buff *sk_tmp = skb; |
| skb = skb_realloc_headroom(sk_tmp, VLAN_HLEN); |
| kfree_skb(sk_tmp); |
| if (!skb) { |
| printk(KERN_ERR "vlan: failed to realloc headroom\n"); |
| return NULL; |
| } |
| } else { |
| skb = skb_unshare(skb, GFP_ATOMIC); |
| if (!skb) { |
| printk(KERN_ERR "vlan: failed to unshare skbuff\n"); |
| return NULL; |
| } |
| } |
| |
| veth = (struct vlan_ethhdr *)skb_push(skb, VLAN_HLEN); |
| |
| /* Move the mac addresses to the beginning of the new header. */ |
| memmove(skb->data, skb->data + VLAN_HLEN, 2 * VLAN_ETH_ALEN); |
| |
| /* first, the ethernet type */ |
| veth->h_vlan_proto = __constant_htons(ETH_P_8021Q); |
| |
| /* now, the tag */ |
| veth->h_vlan_TCI = htons(tag); |
| |
| skb->protocol = __constant_htons(ETH_P_8021Q); |
| skb->mac_header -= VLAN_HLEN; |
| skb->network_header -= VLAN_HLEN; |
| |
| return skb; |
| } |
| |
| /** |
| * __vlan_hwaccel_put_tag - hardware accelerated VLAN inserting |
| * @skb: skbuff to tag |
| * @tag: VLAN tag to insert |
| * |
| * Puts the VLAN tag in @skb->cb[] and lets the device do the rest |
| */ |
| static inline struct sk_buff *__vlan_hwaccel_put_tag(struct sk_buff *skb, unsigned short tag) |
| { |
| struct vlan_skb_tx_cookie *cookie; |
| |
| cookie = VLAN_TX_SKB_CB(skb); |
| cookie->magic = VLAN_TX_COOKIE_MAGIC; |
| cookie->vlan_tag = tag; |
| |
| return skb; |
| } |
| |
| #define HAVE_VLAN_PUT_TAG |
| |
| /** |
| * vlan_put_tag - inserts VLAN tag according to device features |
| * @skb: skbuff to tag |
| * @tag: VLAN tag to insert |
| * |
| * Assumes skb->dev is the target that will xmit this frame. |
| * Returns a VLAN tagged skb. |
| */ |
| static inline struct sk_buff *vlan_put_tag(struct sk_buff *skb, unsigned short tag) |
| { |
| if (skb->dev->features & NETIF_F_HW_VLAN_TX) { |
| return __vlan_hwaccel_put_tag(skb, tag); |
| } else { |
| return __vlan_put_tag(skb, tag); |
| } |
| } |
| |
| /** |
| * __vlan_get_tag - get the VLAN ID that is part of the payload |
| * @skb: skbuff to query |
| * @tag: buffer to store vlaue |
| * |
| * Returns error if the skb is not of VLAN type |
| */ |
| static inline int __vlan_get_tag(struct sk_buff *skb, unsigned short *tag) |
| { |
| struct vlan_ethhdr *veth = (struct vlan_ethhdr *)skb->data; |
| |
| if (veth->h_vlan_proto != __constant_htons(ETH_P_8021Q)) { |
| return -EINVAL; |
| } |
| |
| *tag = ntohs(veth->h_vlan_TCI); |
| |
| return 0; |
| } |
| |
| /** |
| * __vlan_hwaccel_get_tag - get the VLAN ID that is in @skb->cb[] |
| * @skb: skbuff to query |
| * @tag: buffer to store vlaue |
| * |
| * Returns error if @skb->cb[] is not set correctly |
| */ |
| static inline int __vlan_hwaccel_get_tag(struct sk_buff *skb, unsigned short *tag) |
| { |
| struct vlan_skb_tx_cookie *cookie; |
| |
| cookie = VLAN_TX_SKB_CB(skb); |
| if (cookie->magic == VLAN_TX_COOKIE_MAGIC) { |
| *tag = cookie->vlan_tag; |
| return 0; |
| } else { |
| *tag = 0; |
| return -EINVAL; |
| } |
| } |
| |
| #define HAVE_VLAN_GET_TAG |
| |
| /** |
| * vlan_get_tag - get the VLAN ID from the skb |
| * @skb: skbuff to query |
| * @tag: buffer to store vlaue |
| * |
| * Returns error if the skb is not VLAN tagged |
| */ |
| static inline int vlan_get_tag(struct sk_buff *skb, unsigned short *tag) |
| { |
| if (skb->dev->features & NETIF_F_HW_VLAN_TX) { |
| return __vlan_hwaccel_get_tag(skb, tag); |
| } else { |
| return __vlan_get_tag(skb, tag); |
| } |
| } |
| |
| #endif /* __KERNEL__ */ |
| |
| /* VLAN IOCTLs are found in sockios.h */ |
| |
| /* Passed in vlan_ioctl_args structure to determine behaviour. */ |
| enum vlan_ioctl_cmds { |
| ADD_VLAN_CMD, |
| DEL_VLAN_CMD, |
| SET_VLAN_INGRESS_PRIORITY_CMD, |
| SET_VLAN_EGRESS_PRIORITY_CMD, |
| GET_VLAN_INGRESS_PRIORITY_CMD, |
| GET_VLAN_EGRESS_PRIORITY_CMD, |
| SET_VLAN_NAME_TYPE_CMD, |
| SET_VLAN_FLAG_CMD, |
| GET_VLAN_REALDEV_NAME_CMD, /* If this works, you know it's a VLAN device, btw */ |
| GET_VLAN_VID_CMD /* Get the VID of this VLAN (specified by name) */ |
| }; |
| |
| enum vlan_flags { |
| VLAN_FLAG_REORDER_HDR = 0x1, |
| }; |
| |
| enum vlan_name_types { |
| VLAN_NAME_TYPE_PLUS_VID, /* Name will look like: vlan0005 */ |
| VLAN_NAME_TYPE_RAW_PLUS_VID, /* name will look like: eth1.0005 */ |
| VLAN_NAME_TYPE_PLUS_VID_NO_PAD, /* Name will look like: vlan5 */ |
| VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD, /* Name will look like: eth0.5 */ |
| VLAN_NAME_TYPE_HIGHEST |
| }; |
| |
| struct vlan_ioctl_args { |
| int cmd; /* Should be one of the vlan_ioctl_cmds enum above. */ |
| char device1[24]; |
| |
| union { |
| char device2[24]; |
| int VID; |
| unsigned int skb_priority; |
| unsigned int name_type; |
| unsigned int bind_type; |
| unsigned int flag; /* Matches vlan_dev_info flags */ |
| } u; |
| |
| short vlan_qos; |
| }; |
| |
| #endif /* !(_LINUX_IF_VLAN_H_) */ |