http://www.ousob.com --- Legacy Redefined OuSob - File: /wwwroot/clipx/usr/include/linux/if_vlan.h

/* * 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/proc_fs.h> /* for proc_dir_entry */ #include <linux/netdevice.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 */ unsigned short 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.raw; } 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 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[VLAN_GROUP_ARRAY_LEN]; struct rcu_head rcu; }; struct vlan_priority_tci_mapping { unsigned long 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 long ingress_priority_map[8]; 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; skb->dev = grp->vlan_devices[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 (!memcmp(eth_hdr(skb)->h_dest, skb->dev->dev_addr, ETH_ALEN)) 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.raw -= VLAN_HLEN; skb->nh.raw -= 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_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_) */