416 lines
11 KiB
C
416 lines
11 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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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/rtnetlink.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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/*
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* struct vlan_hdr - vlan header
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* @h_vlan_TCI: priority and VLAN ID
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* @h_vlan_encapsulated_proto: packet type ID or len
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*/
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struct vlan_hdr {
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__be16 h_vlan_TCI;
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__be16 h_vlan_encapsulated_proto;
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};
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/**
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* struct vlan_ethhdr - vlan ethernet header (ethhdr + vlan_hdr)
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* @h_dest: destination ethernet address
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* @h_source: source ethernet address
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* @h_vlan_proto: ethernet protocol (always 0x8100)
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* @h_vlan_TCI: priority and VLAN ID
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* @h_vlan_encapsulated_proto: packet type ID or len
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*/
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struct vlan_ethhdr {
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unsigned char h_dest[ETH_ALEN];
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unsigned char h_source[ETH_ALEN];
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__be16 h_vlan_proto;
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__be16 h_vlan_TCI;
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__be16 h_vlan_encapsulated_proto;
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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_header(skb);
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}
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#define VLAN_PRIO_MASK 0xe000 /* Priority Code Point */
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#define VLAN_PRIO_SHIFT 13
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#define VLAN_CFI_MASK 0x1000 /* Canonical Format Indicator */
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#define VLAN_TAG_PRESENT VLAN_CFI_MASK
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#define VLAN_VID_MASK 0x0fff /* VLAN Identifier */
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#define VLAN_N_VID 4096
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/* found in socket.c */
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extern void vlan_ioctl_set(int (*hook)(struct net *, void __user *));
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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_SPLIT_PARTS 8
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#define VLAN_GROUP_ARRAY_PART_LEN (VLAN_N_VID/VLAN_GROUP_ARRAY_SPLIT_PARTS)
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struct vlan_group {
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struct net_device *real_dev; /* The ethernet(like) device
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* the vlan is attached to.
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*/
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unsigned int nr_vlans;
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int killall;
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struct hlist_node hlist; /* linked list */
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struct net_device **vlan_devices_arrays[VLAN_GROUP_ARRAY_SPLIT_PARTS];
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struct rcu_head rcu;
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};
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static inline struct net_device *vlan_group_get_device(struct vlan_group *vg,
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u16 vlan_id)
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{
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struct net_device **array;
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array = vg->vlan_devices_arrays[vlan_id / VLAN_GROUP_ARRAY_PART_LEN];
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return array ? array[vlan_id % VLAN_GROUP_ARRAY_PART_LEN] : NULL;
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}
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static inline void vlan_group_set_device(struct vlan_group *vg,
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u16 vlan_id,
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struct net_device *dev)
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{
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struct net_device **array;
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if (!vg)
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return;
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array = vg->vlan_devices_arrays[vlan_id / VLAN_GROUP_ARRAY_PART_LEN];
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array[vlan_id % VLAN_GROUP_ARRAY_PART_LEN] = dev;
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}
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#define vlan_tx_tag_present(__skb) ((__skb)->vlan_tci & VLAN_TAG_PRESENT)
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#define vlan_tx_tag_get(__skb) ((__skb)->vlan_tci & ~VLAN_TAG_PRESENT)
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#if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE)
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/* Must be invoked with rcu_read_lock or with RTNL. */
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static inline struct net_device *vlan_find_dev(struct net_device *real_dev,
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u16 vlan_id)
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{
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struct vlan_group *grp = rcu_dereference_rtnl(real_dev->vlgrp);
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if (grp)
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return vlan_group_get_device(grp, vlan_id);
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return NULL;
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}
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extern struct net_device *vlan_dev_real_dev(const struct net_device *dev);
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extern u16 vlan_dev_vlan_id(const struct net_device *dev);
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extern int __vlan_hwaccel_rx(struct sk_buff *skb, struct vlan_group *grp,
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u16 vlan_tci, int polling);
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extern bool vlan_hwaccel_do_receive(struct sk_buff **skb);
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extern gro_result_t
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vlan_gro_receive(struct napi_struct *napi, struct vlan_group *grp,
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unsigned int vlan_tci, struct sk_buff *skb);
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extern gro_result_t
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vlan_gro_frags(struct napi_struct *napi, struct vlan_group *grp,
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unsigned int vlan_tci);
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#else
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static inline struct net_device *vlan_find_dev(struct net_device *real_dev,
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u16 vlan_id)
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{
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return NULL;
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}
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static inline struct net_device *vlan_dev_real_dev(const struct net_device *dev)
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{
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BUG();
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return NULL;
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}
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static inline u16 vlan_dev_vlan_id(const struct net_device *dev)
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{
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BUG();
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return 0;
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}
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static inline int __vlan_hwaccel_rx(struct sk_buff *skb, struct vlan_group *grp,
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u16 vlan_tci, int polling)
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{
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BUG();
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return NET_XMIT_SUCCESS;
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}
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static inline bool vlan_hwaccel_do_receive(struct sk_buff **skb)
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{
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if ((*skb)->vlan_tci & VLAN_VID_MASK)
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(*skb)->pkt_type = PACKET_OTHERHOST;
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return false;
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}
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static inline gro_result_t
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vlan_gro_receive(struct napi_struct *napi, struct vlan_group *grp,
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unsigned int vlan_tci, struct sk_buff *skb)
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{
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return GRO_DROP;
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}
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static inline gro_result_t
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vlan_gro_frags(struct napi_struct *napi, struct vlan_group *grp,
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unsigned int vlan_tci)
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{
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return GRO_DROP;
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}
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#endif
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/**
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* vlan_hwaccel_rx - netif_rx wrapper for VLAN RX acceleration
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* @skb: buffer
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* @grp: vlan group
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* @vlan_tci: VLAN TCI as received from the card
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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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u16 vlan_tci)
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{
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return __vlan_hwaccel_rx(skb, grp, vlan_tci, 0);
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}
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/**
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* vlan_hwaccel_receive_skb - netif_receive_skb wrapper for VLAN RX acceleration
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* @skb: buffer
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* @grp: vlan group
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* @vlan_tci: VLAN TCI as received from the card
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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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u16 vlan_tci)
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{
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return __vlan_hwaccel_rx(skb, grp, vlan_tci, 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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* @vlan_tci: VLAN TCI 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, u16 vlan_tci)
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{
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struct vlan_ethhdr *veth;
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if (skb_cow_head(skb, VLAN_HLEN) < 0) {
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kfree_skb(skb);
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return NULL;
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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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skb->mac_header -= VLAN_HLEN;
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/* first, the ethernet type */
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veth->h_vlan_proto = htons(ETH_P_8021Q);
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/* now, the TCI */
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veth->h_vlan_TCI = htons(vlan_tci);
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skb->protocol = htons(ETH_P_8021Q);
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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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* @vlan_tci: VLAN TCI to insert
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*
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* Puts the VLAN TCI in @skb->vlan_tci 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,
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u16 vlan_tci)
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{
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skb->vlan_tci = VLAN_TAG_PRESENT | vlan_tci;
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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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* @vlan_tci: VLAN TCI 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, u16 vlan_tci)
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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, vlan_tci);
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} else {
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return __vlan_put_tag(skb, vlan_tci);
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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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* @vlan_tci: 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(const struct sk_buff *skb, u16 *vlan_tci)
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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 != htons(ETH_P_8021Q)) {
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return -EINVAL;
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}
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*vlan_tci = 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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* @vlan_tci: buffer to store vlaue
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*
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* Returns error if @skb->vlan_tci is not set correctly
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*/
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static inline int __vlan_hwaccel_get_tag(const struct sk_buff *skb,
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u16 *vlan_tci)
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{
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if (vlan_tx_tag_present(skb)) {
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*vlan_tci = vlan_tx_tag_get(skb);
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return 0;
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} else {
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*vlan_tci = 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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* @vlan_tci: 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(const struct sk_buff *skb, u16 *vlan_tci)
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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, vlan_tci);
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} else {
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return __vlan_get_tag(skb, vlan_tci);
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}
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}
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/**
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* vlan_get_protocol - get protocol EtherType.
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* @skb: skbuff to query
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*
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* Returns the EtherType of the packet, regardless of whether it is
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* vlan encapsulated (normal or hardware accelerated) or not.
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*/
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static inline __be16 vlan_get_protocol(const struct sk_buff *skb)
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{
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__be16 protocol = 0;
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if (vlan_tx_tag_present(skb) ||
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skb->protocol != cpu_to_be16(ETH_P_8021Q))
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protocol = skb->protocol;
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else {
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__be16 proto, *protop;
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protop = skb_header_pointer(skb, offsetof(struct vlan_ethhdr,
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h_vlan_encapsulated_proto),
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sizeof(proto), &proto);
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if (likely(protop))
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protocol = *protop;
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}
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return protocol;
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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_flags {
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VLAN_FLAG_REORDER_HDR = 0x1,
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VLAN_FLAG_GVRP = 0x2,
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VLAN_FLAG_LOOSE_BINDING = 0x4,
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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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