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author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 22:20:36 (GMT) |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 22:20:36 (GMT) |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /include/linux/if_vlan.h | |
download | linux-fsl-qoriq-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.xz |
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'include/linux/if_vlan.h')
-rw-r--r-- | include/linux/if_vlan.h | 398 |
1 files changed, 398 insertions, 0 deletions
diff --git a/include/linux/if_vlan.h b/include/linux/if_vlan.h new file mode 100644 index 0000000..62a9d89 --- /dev/null +++ b/include/linux/if_vlan.h @@ -0,0 +1,398 @@ +/* + * 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 */ + unsigned short h_vlan_proto; /* Should always be 0x8100 */ + unsigned short 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 { + unsigned short h_vlan_TCI; /* Encapsulates priority and VLAN ID */ + unsigned short 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->real_dev = skb->dev; + 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_) */ |