summaryrefslogtreecommitdiffstats
path: root/include/linux/if_vlan.h
diff options
context:
space:
mode:
Diffstat (limited to 'include/linux/if_vlan.h')
-rw-r--r--include/linux/if_vlan.h398
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 000000000000..62a9d89dfbe2
--- /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_) */
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-28 19:58:13 +0000