diff options
| author | Meizu OpenSource <patchwork@meizu.com> | 2016-08-15 10:19:42 +0800 |
|---|---|---|
| committer | Meizu OpenSource <patchwork@meizu.com> | 2016-08-15 10:19:42 +0800 |
| commit | d2e1446d81725c351dc73a03b397ce043fb18452 (patch) | |
| tree | 4dbc616b7f92aea39cd697a9084205ddb805e344 /include/linux/if_vlan.h | |
first commit
Diffstat (limited to 'include/linux/if_vlan.h')
| -rw-r--r-- | include/linux/if_vlan.h | 380 |
1 files changed, 380 insertions, 0 deletions
diff --git a/include/linux/if_vlan.h b/include/linux/if_vlan.h new file mode 100644 index 000000000..0b3498800 --- /dev/null +++ b/include/linux/if_vlan.h @@ -0,0 +1,380 @@ +/* + * 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_ + +#include <linux/netdevice.h> +#include <linux/etherdevice.h> +#include <linux/rtnetlink.h> +#include <linux/bug.h> +#include <uapi/linux/if_vlan.h> + +#define VLAN_HLEN 4 /* The additional bytes required by VLAN + * (in addition to the Ethernet header) + */ +#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 + * @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 *)); + +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) +#define vlan_tx_tag_get_id(__skb) ((__skb)->vlan_tci & VLAN_VID_MASK) + +#if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE) + +extern struct net_device *__vlan_find_dev_deep(struct net_device *real_dev, + __be16 vlan_proto, u16 vlan_id); +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 bool vlan_do_receive(struct sk_buff **skb); +extern struct sk_buff *vlan_untag(struct sk_buff *skb); + +extern int vlan_vid_add(struct net_device *dev, __be16 proto, u16 vid); +extern void vlan_vid_del(struct net_device *dev, __be16 proto, u16 vid); + +extern int vlan_vids_add_by_dev(struct net_device *dev, + const struct net_device *by_dev); +extern void vlan_vids_del_by_dev(struct net_device *dev, + const struct net_device *by_dev); + +extern bool vlan_uses_dev(const struct net_device *dev); +#else +static inline struct net_device * +__vlan_find_dev_deep(struct net_device *real_dev, + __be16 vlan_proto, 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 bool vlan_do_receive(struct sk_buff **skb) +{ + return false; +} + +static inline struct sk_buff *vlan_untag(struct sk_buff *skb) +{ + return skb; +} + +static inline int vlan_vid_add(struct net_device *dev, __be16 proto, u16 vid) +{ + return 0; +} + +static inline void vlan_vid_del(struct net_device *dev, __be16 proto, u16 vid) +{ +} + +static inline int vlan_vids_add_by_dev(struct net_device *dev, + const struct net_device *by_dev) +{ + return 0; +} + +static inline void vlan_vids_del_by_dev(struct net_device *dev, + const struct net_device *by_dev) +{ +} + +static inline bool vlan_uses_dev(const struct net_device *dev) +{ + return false; +} +#endif + +static inline bool vlan_hw_offload_capable(netdev_features_t features, + __be16 proto) +{ + if (proto == htons(ETH_P_8021Q) && features & NETIF_F_HW_VLAN_CTAG_TX) + return true; + if (proto == htons(ETH_P_8021AD) && features & NETIF_F_HW_VLAN_STAG_TX) + return true; + return false; +} + +/** + * vlan_insert_tag - regular VLAN tag inserting + * @skb: skbuff to tag + * @vlan_proto: VLAN encapsulation protocol + * @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, + __be16 vlan_proto, 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 * ETH_ALEN); + skb->mac_header -= VLAN_HLEN; + + /* first, the ethernet type */ + veth->h_vlan_proto = vlan_proto; + + /* 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, + __be16 vlan_proto, u16 vlan_tci) +{ + skb = vlan_insert_tag(skb, vlan_proto, vlan_tci); + if (skb) + skb->protocol = vlan_proto; + return skb; +} + +/** + * __vlan_hwaccel_put_tag - hardware accelerated VLAN inserting + * @skb: skbuff to tag + * @vlan_proto: VLAN encapsulation protocol + * @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, + __be16 vlan_proto, + u16 vlan_tci) +{ + skb->vlan_proto = vlan_proto; + 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, + __be16 vlan_proto, u16 vlan_tci) +{ + if (vlan_hw_offload_capable(skb->dev->features, vlan_proto)) { + return __vlan_hwaccel_put_tag(skb, vlan_proto, vlan_tci); + } else { + return __vlan_put_tag(skb, vlan_proto, 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) && + veth->h_vlan_proto != htons(ETH_P_8021AD)) + 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_CTAG_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; +} + +static inline void vlan_set_encap_proto(struct sk_buff *skb, + struct vlan_hdr *vhdr) +{ + __be16 proto; + unsigned short *rawp; + + /* + * Was a VLAN packet, grab the encapsulated protocol, which the layer + * three protocols care about. + */ + + proto = vhdr->h_vlan_encapsulated_proto; + if (ntohs(proto) >= ETH_P_802_3_MIN) { + skb->protocol = proto; + return; + } + + rawp = (unsigned short *)(vhdr + 1); + if (*rawp == 0xFFFF) + /* + * This is a magic hack to spot IPX packets. Older Novell + * breaks the protocol design and runs IPX over 802.3 without + * an 802.2 LLC layer. We look for FFFF which isn't a used + * 802.2 SSAP/DSAP. This won't work for fault tolerant netware + * but does for the rest. + */ + skb->protocol = htons(ETH_P_802_3); + else + /* + * Real 802.2 LLC + */ + skb->protocol = htons(ETH_P_802_2); +} +#endif /* !(_LINUX_IF_VLAN_H_) */ |
