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