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- /*
- * 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__
- #include <linux/netdevice.h>
- #include <linux/etherdevice.h>
- #include <linux/rtnetlink.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_hdr - vlan header
- * @h_vlan_TCI: priority and VLAN ID
- * @h_vlan_encapsulated_proto: packet type ID or len
- */
- struct vlan_hdr {
- __be16 h_vlan_TCI;
- __be16 h_vlan_encapsulated_proto;
- };
- /**
- * struct vlan_ethhdr - vlan ethernet header (ethhdr + vlan_hdr)
- * @h_dest: destination ethernet address
- * @h_source: source ethernet address
- * @h_vlan_proto: ethernet protocol (always 0x8100)
- * @h_vlan_TCI: priority and VLAN ID
- * @h_vlan_encapsulated_proto: packet type ID or len
- */
- struct vlan_ethhdr {
- unsigned char h_dest[ETH_ALEN];
- unsigned char h_source[ETH_ALEN];
- __be16 h_vlan_proto;
- __be16 h_vlan_TCI;
- __be16 h_vlan_encapsulated_proto;
- };
- #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);
- }
- #define VLAN_PRIO_MASK 0xe000 /* Priority Code Point */
- #define VLAN_PRIO_SHIFT 13
- #define VLAN_CFI_MASK 0x1000 /* Canonical Format Indicator */
- #define VLAN_TAG_PRESENT VLAN_CFI_MASK
- #define VLAN_VID_MASK 0x0fff /* VLAN Identifier */
- #define VLAN_N_VID 4096
- /* found in socket.c */
- extern void vlan_ioctl_set(int (*hook)(struct net *, void __user *));
- /* 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_SPLIT_PARTS 8
- #define VLAN_GROUP_ARRAY_PART_LEN (VLAN_N_VID/VLAN_GROUP_ARRAY_SPLIT_PARTS)
- struct vlan_group {
- struct net_device *real_dev; /* The ethernet(like) device
- * the vlan is attached to.
- */
- unsigned int nr_vlans;
- 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,
- u16 vlan_id)
- {
- struct net_device **array;
- array = vg->vlan_devices_arrays[vlan_id / VLAN_GROUP_ARRAY_PART_LEN];
- return array ? array[vlan_id % VLAN_GROUP_ARRAY_PART_LEN] : NULL;
- }
- static inline void vlan_group_set_device(struct vlan_group *vg,
- u16 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;
- }
- static inline int is_vlan_dev(struct net_device *dev)
- {
- return dev->priv_flags & IFF_802_1Q_VLAN;
- }
- #define vlan_tx_tag_present(__skb) ((__skb)->vlan_tci & VLAN_TAG_PRESENT)
- #define vlan_tx_tag_get(__skb) ((__skb)->vlan_tci & ~VLAN_TAG_PRESENT)
- #if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE)
- extern struct net_device *vlan_dev_real_dev(const struct net_device *dev);
- extern u16 vlan_dev_vlan_id(const struct net_device *dev);
- extern int __vlan_hwaccel_rx(struct sk_buff *skb, struct vlan_group *grp,
- u16 vlan_tci, int polling);
- extern bool vlan_do_receive(struct sk_buff **skb);
- extern struct sk_buff *vlan_untag(struct sk_buff *skb);
- extern gro_result_t
- vlan_gro_receive(struct napi_struct *napi, struct vlan_group *grp,
- unsigned int vlan_tci, struct sk_buff *skb);
- extern gro_result_t
- vlan_gro_frags(struct napi_struct *napi, struct vlan_group *grp,
- unsigned int vlan_tci);
- #else
- static inline struct net_device *vlan_find_dev(struct net_device *real_dev,
- u16 vlan_id)
- {
- return NULL;
- }
- static inline struct net_device *vlan_dev_real_dev(const struct net_device *dev)
- {
- BUG();
- return NULL;
- }
- static inline u16 vlan_dev_vlan_id(const struct net_device *dev)
- {
- BUG();
- return 0;
- }
- static inline int __vlan_hwaccel_rx(struct sk_buff *skb, struct vlan_group *grp,
- u16 vlan_tci, int polling)
- {
- BUG();
- return NET_XMIT_SUCCESS;
- }
- static inline bool vlan_do_receive(struct sk_buff **skb)
- {
- if ((*skb)->vlan_tci & VLAN_VID_MASK)
- (*skb)->pkt_type = PACKET_OTHERHOST;
- return false;
- }
- static inline struct sk_buff *vlan_untag(struct sk_buff *skb)
- {
- return skb;
- }
- static inline gro_result_t
- vlan_gro_receive(struct napi_struct *napi, struct vlan_group *grp,
- unsigned int vlan_tci, struct sk_buff *skb)
- {
- return GRO_DROP;
- }
- static inline gro_result_t
- vlan_gro_frags(struct napi_struct *napi, struct vlan_group *grp,
- unsigned int vlan_tci)
- {
- return GRO_DROP;
- }
- #endif
- /**
- * vlan_hwaccel_rx - netif_rx wrapper for VLAN RX acceleration
- * @skb: buffer
- * @grp: vlan group
- * @vlan_tci: VLAN TCI as received from the card
- */
- static inline int vlan_hwaccel_rx(struct sk_buff *skb,
- struct vlan_group *grp,
- u16 vlan_tci)
- {
- return __vlan_hwaccel_rx(skb, grp, vlan_tci, 0);
- }
- /**
- * vlan_hwaccel_receive_skb - netif_receive_skb wrapper for VLAN RX acceleration
- * @skb: buffer
- * @grp: vlan group
- * @vlan_tci: VLAN TCI as received from the card
- */
- static inline int vlan_hwaccel_receive_skb(struct sk_buff *skb,
- struct vlan_group *grp,
- u16 vlan_tci)
- {
- return __vlan_hwaccel_rx(skb, grp, vlan_tci, 1);
- }
- /**
- * vlan_insert_tag - regular VLAN tag inserting
- * @skb: skbuff to tag
- * @vlan_tci: VLAN TCI 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.
- *
- * Does not change skb->protocol so this function can be used during receive.
- */
- static inline struct sk_buff *vlan_insert_tag(struct sk_buff *skb, u16 vlan_tci)
- {
- struct vlan_ethhdr *veth;
- if (skb_cow_head(skb, VLAN_HLEN) < 0) {
- kfree_skb(skb);
- 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);
- skb->mac_header -= VLAN_HLEN;
- /* first, the ethernet type */
- veth->h_vlan_proto = htons(ETH_P_8021Q);
- /* now, the TCI */
- veth->h_vlan_TCI = htons(vlan_tci);
- return skb;
- }
- /**
- * __vlan_put_tag - regular VLAN tag inserting
- * @skb: skbuff to tag
- * @vlan_tci: VLAN TCI 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, u16 vlan_tci)
- {
- skb = vlan_insert_tag(skb, vlan_tci);
- if (skb)
- skb->protocol = htons(ETH_P_8021Q);
- return skb;
- }
- /**
- * __vlan_hwaccel_put_tag - hardware accelerated VLAN inserting
- * @skb: skbuff to tag
- * @vlan_tci: VLAN TCI to insert
- *
- * Puts the VLAN TCI in @skb->vlan_tci and lets the device do the rest
- */
- static inline struct sk_buff *__vlan_hwaccel_put_tag(struct sk_buff *skb,
- u16 vlan_tci)
- {
- skb->vlan_tci = VLAN_TAG_PRESENT | vlan_tci;
- return skb;
- }
- #define HAVE_VLAN_PUT_TAG
- /**
- * vlan_put_tag - inserts VLAN tag according to device features
- * @skb: skbuff to tag
- * @vlan_tci: VLAN TCI 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, u16 vlan_tci)
- {
- if (skb->dev->features & NETIF_F_HW_VLAN_TX) {
- return __vlan_hwaccel_put_tag(skb, vlan_tci);
- } else {
- return __vlan_put_tag(skb, vlan_tci);
- }
- }
- /**
- * __vlan_get_tag - get the VLAN ID that is part of the payload
- * @skb: skbuff to query
- * @vlan_tci: buffer to store vlaue
- *
- * Returns error if the skb is not of VLAN type
- */
- static inline int __vlan_get_tag(const struct sk_buff *skb, u16 *vlan_tci)
- {
- struct vlan_ethhdr *veth = (struct vlan_ethhdr *)skb->data;
- if (veth->h_vlan_proto != htons(ETH_P_8021Q)) {
- return -EINVAL;
- }
- *vlan_tci = ntohs(veth->h_vlan_TCI);
- return 0;
- }
- /**
- * __vlan_hwaccel_get_tag - get the VLAN ID that is in @skb->cb[]
- * @skb: skbuff to query
- * @vlan_tci: buffer to store vlaue
- *
- * Returns error if @skb->vlan_tci is not set correctly
- */
- static inline int __vlan_hwaccel_get_tag(const struct sk_buff *skb,
- u16 *vlan_tci)
- {
- if (vlan_tx_tag_present(skb)) {
- *vlan_tci = vlan_tx_tag_get(skb);
- return 0;
- } else {
- *vlan_tci = 0;
- return -EINVAL;
- }
- }
- #define HAVE_VLAN_GET_TAG
- /**
- * vlan_get_tag - get the VLAN ID from the skb
- * @skb: skbuff to query
- * @vlan_tci: buffer to store vlaue
- *
- * Returns error if the skb is not VLAN tagged
- */
- static inline int vlan_get_tag(const struct sk_buff *skb, u16 *vlan_tci)
- {
- if (skb->dev->features & NETIF_F_HW_VLAN_TX) {
- return __vlan_hwaccel_get_tag(skb, vlan_tci);
- } else {
- return __vlan_get_tag(skb, vlan_tci);
- }
- }
- /**
- * vlan_get_protocol - get protocol EtherType.
- * @skb: skbuff to query
- *
- * Returns the EtherType of the packet, regardless of whether it is
- * vlan encapsulated (normal or hardware accelerated) or not.
- */
- static inline __be16 vlan_get_protocol(const struct sk_buff *skb)
- {
- __be16 protocol = 0;
- if (vlan_tx_tag_present(skb) ||
- skb->protocol != cpu_to_be16(ETH_P_8021Q))
- protocol = skb->protocol;
- else {
- __be16 proto, *protop;
- protop = skb_header_pointer(skb, offsetof(struct vlan_ethhdr,
- h_vlan_encapsulated_proto),
- sizeof(proto), &proto);
- if (likely(protop))
- protocol = *protop;
- }
- return protocol;
- }
- #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,
- VLAN_FLAG_GVRP = 0x2,
- VLAN_FLAG_LOOSE_BINDING = 0x4,
- };
- 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_) */
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