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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /include/linux/if_vlan.h
Initial import
Diffstat (limited to 'include/linux/if_vlan.h')
-rw-r--r--include/linux/if_vlan.h631
1 files changed, 631 insertions, 0 deletions
diff --git a/include/linux/if_vlan.h b/include/linux/if_vlan.h
new file mode 100644
index 000000000..920e4457c
--- /dev/null
+++ b/include/linux/if_vlan.h
@@ -0,0 +1,631 @@
+/*
+ * 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 bool is_vlan_dev(struct net_device *dev)
+{
+ return dev->priv_flags & IFF_802_1Q_VLAN;
+}
+
+#define skb_vlan_tag_present(__skb) ((__skb)->vlan_tci & VLAN_TAG_PRESENT)
+#define skb_vlan_tag_get(__skb) ((__skb)->vlan_tci & ~VLAN_TAG_PRESENT)
+#define skb_vlan_tag_get_id(__skb) ((__skb)->vlan_tci & VLAN_VID_MASK)
+
+/**
+ * struct vlan_pcpu_stats - VLAN percpu rx/tx stats
+ * @rx_packets: number of received packets
+ * @rx_bytes: number of received bytes
+ * @rx_multicast: number of received multicast packets
+ * @tx_packets: number of transmitted packets
+ * @tx_bytes: number of transmitted bytes
+ * @syncp: synchronization point for 64bit counters
+ * @rx_errors: number of rx errors
+ * @tx_dropped: number of tx drops
+ */
+struct vlan_pcpu_stats {
+ u64 rx_packets;
+ u64 rx_bytes;
+ u64 rx_multicast;
+ u64 tx_packets;
+ u64 tx_bytes;
+ struct u64_stats_sync syncp;
+ u32 rx_errors;
+ u32 tx_dropped;
+};
+
+#if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE)
+
+extern struct net_device *__vlan_find_dev_deep_rcu(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 __be16 vlan_dev_vlan_proto(const struct net_device *dev);
+
+/**
+ * struct vlan_priority_tci_mapping - vlan egress priority mappings
+ * @priority: skb priority
+ * @vlan_qos: vlan priority: (skb->priority << 13) & 0xE000
+ * @next: pointer to next struct
+ */
+struct vlan_priority_tci_mapping {
+ u32 priority;
+ u16 vlan_qos;
+ struct vlan_priority_tci_mapping *next;
+};
+
+struct proc_dir_entry;
+struct netpoll;
+
+/**
+ * struct vlan_dev_priv - VLAN private device data
+ * @nr_ingress_mappings: number of ingress priority mappings
+ * @ingress_priority_map: ingress priority mappings
+ * @nr_egress_mappings: number of egress priority mappings
+ * @egress_priority_map: hash of egress priority mappings
+ * @vlan_proto: VLAN encapsulation protocol
+ * @vlan_id: VLAN identifier
+ * @flags: device flags
+ * @real_dev: underlying netdevice
+ * @real_dev_addr: address of underlying netdevice
+ * @dent: proc dir entry
+ * @vlan_pcpu_stats: ptr to percpu rx stats
+ */
+struct vlan_dev_priv {
+ unsigned int nr_ingress_mappings;
+ u32 ingress_priority_map[8];
+ unsigned int nr_egress_mappings;
+ struct vlan_priority_tci_mapping *egress_priority_map[16];
+
+ __be16 vlan_proto;
+ u16 vlan_id;
+ u16 flags;
+
+ struct net_device *real_dev;
+ unsigned char real_dev_addr[ETH_ALEN];
+
+ struct proc_dir_entry *dent;
+ struct vlan_pcpu_stats __percpu *vlan_pcpu_stats;
+#ifdef CONFIG_NET_POLL_CONTROLLER
+ struct netpoll *netpoll;
+#endif
+ unsigned int nest_level;
+};
+
+static inline struct vlan_dev_priv *vlan_dev_priv(const struct net_device *dev)
+{
+ return netdev_priv(dev);
+}
+
+static inline u16
+vlan_dev_get_egress_qos_mask(struct net_device *dev, u32 skprio)
+{
+ struct vlan_priority_tci_mapping *mp;
+
+ smp_rmb(); /* coupled with smp_wmb() in vlan_dev_set_egress_priority() */
+
+ mp = vlan_dev_priv(dev)->egress_priority_map[(skprio & 0xF)];
+ while (mp) {
+ if (mp->priority == skprio) {
+ return mp->vlan_qos; /* This should already be shifted
+ * to mask correctly with the
+ * VLAN's TCI */
+ }
+ mp = mp->next;
+ }
+ return 0;
+}
+
+extern bool vlan_do_receive(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);
+
+static inline int vlan_get_encap_level(struct net_device *dev)
+{
+ BUG_ON(!is_vlan_dev(dev));
+ return vlan_dev_priv(dev)->nest_level;
+}
+#else
+static inline struct net_device *
+__vlan_find_dev_deep_rcu(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 __be16 vlan_dev_vlan_proto(const struct net_device *dev)
+{
+ BUG();
+ return 0;
+}
+
+static inline u16 vlan_dev_get_egress_qos_mask(struct net_device *dev,
+ u32 skprio)
+{
+ return 0;
+}
+
+static inline bool vlan_do_receive(struct sk_buff **skb)
+{
+ return false;
+}
+
+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;
+}
+static inline int vlan_get_encap_level(struct net_device *dev)
+{
+ BUG();
+ return 0;
+}
+#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 error if skb_cow_head failes.
+ *
+ * Does not change skb->protocol so this function can be used during receive.
+ */
+static inline int __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)
+ return -ENOMEM;
+
+ 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 0;
+}
+
+/**
+ * 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)
+{
+ int err;
+
+ err = __vlan_insert_tag(skb, vlan_proto, vlan_tci);
+ if (err) {
+ dev_kfree_skb_any(skb);
+ return NULL;
+ }
+ return skb;
+}
+
+/**
+ * vlan_insert_tag_set_proto - 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.
+ */
+static inline struct sk_buff *vlan_insert_tag_set_proto(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_push_inside - pushes vlan tag to the payload
+ * @skb: skbuff to tag
+ *
+ * Pushes the VLAN tag from @skb->vlan_tci inside to the payload.
+ *
+ * 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_hwaccel_push_inside(struct sk_buff *skb)
+{
+ skb = vlan_insert_tag_set_proto(skb, skb->vlan_proto,
+ skb_vlan_tag_get(skb));
+ if (likely(skb))
+ skb->vlan_tci = 0;
+ return skb;
+}
+/*
+ * vlan_hwaccel_push_inside - pushes vlan tag to the payload
+ * @skb: skbuff to tag
+ *
+ * Checks is tag is present in @skb->vlan_tci and if it is, it pushes the
+ * VLAN tag from @skb->vlan_tci inside to the payload.
+ *
+ * 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_hwaccel_push_inside(struct sk_buff *skb)
+{
+ if (skb_vlan_tag_present(skb))
+ skb = __vlan_hwaccel_push_inside(skb);
+ 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 void __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;
+}
+
+/**
+ * __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 (skb_vlan_tag_present(skb)) {
+ *vlan_tci = skb_vlan_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
+ * @type: first vlan protocol
+ * @depth: buffer to store length of eth and vlan tags in bytes
+ *
+ * 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(struct sk_buff *skb, __be16 type,
+ int *depth)
+{
+ unsigned int vlan_depth = skb->mac_len;
+
+ /* if type is 802.1Q/AD then the header should already be
+ * present at mac_len - VLAN_HLEN (if mac_len > 0), or at
+ * ETH_HLEN otherwise
+ */
+ if (type == htons(ETH_P_8021Q) || type == htons(ETH_P_8021AD)) {
+ if (vlan_depth) {
+ if (WARN_ON(vlan_depth < VLAN_HLEN))
+ return 0;
+ vlan_depth -= VLAN_HLEN;
+ } else {
+ vlan_depth = ETH_HLEN;
+ }
+ do {
+ struct vlan_hdr *vh;
+
+ if (unlikely(!pskb_may_pull(skb,
+ vlan_depth + VLAN_HLEN)))
+ return 0;
+
+ vh = (struct vlan_hdr *)(skb->data + vlan_depth);
+ type = vh->h_vlan_encapsulated_proto;
+ vlan_depth += VLAN_HLEN;
+ } while (type == htons(ETH_P_8021Q) ||
+ type == htons(ETH_P_8021AD));
+ }
+
+ if (depth)
+ *depth = vlan_depth;
+
+ return type;
+}
+
+/**
+ * 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(struct sk_buff *skb)
+{
+ return __vlan_get_protocol(skb, skb->protocol, NULL);
+}
+
+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);
+}
+
+/**
+ * skb_vlan_tagged - check if skb is vlan tagged.
+ * @skb: skbuff to query
+ *
+ * Returns true if the skb is tagged, regardless of whether it is hardware
+ * accelerated or not.
+ */
+static inline bool skb_vlan_tagged(const struct sk_buff *skb)
+{
+ if (!skb_vlan_tag_present(skb) &&
+ likely(skb->protocol != htons(ETH_P_8021Q) &&
+ skb->protocol != htons(ETH_P_8021AD)))
+ return false;
+
+ return true;
+}
+
+/**
+ * skb_vlan_tagged_multi - check if skb is vlan tagged with multiple headers.
+ * @skb: skbuff to query
+ *
+ * Returns true if the skb is tagged with multiple vlan headers, regardless
+ * of whether it is hardware accelerated or not.
+ */
+static inline bool skb_vlan_tagged_multi(const struct sk_buff *skb)
+{
+ __be16 protocol = skb->protocol;
+
+ if (!skb_vlan_tag_present(skb)) {
+ struct vlan_ethhdr *veh;
+
+ if (likely(protocol != htons(ETH_P_8021Q) &&
+ protocol != htons(ETH_P_8021AD)))
+ return false;
+
+ veh = (struct vlan_ethhdr *)skb->data;
+ protocol = veh->h_vlan_encapsulated_proto;
+ }
+
+ if (protocol != htons(ETH_P_8021Q) && protocol != htons(ETH_P_8021AD))
+ return false;
+
+ return true;
+}
+
+/**
+ * vlan_features_check - drop unsafe features for skb with multiple tags.
+ * @skb: skbuff to query
+ * @features: features to be checked
+ *
+ * Returns features without unsafe ones if the skb has multiple tags.
+ */
+static inline netdev_features_t vlan_features_check(const struct sk_buff *skb,
+ netdev_features_t features)
+{
+ if (skb_vlan_tagged_multi(skb))
+ features = netdev_intersect_features(features,
+ NETIF_F_SG |
+ NETIF_F_HIGHDMA |
+ NETIF_F_FRAGLIST |
+ NETIF_F_GEN_CSUM |
+ NETIF_F_HW_VLAN_CTAG_TX |
+ NETIF_F_HW_VLAN_STAG_TX);
+
+ return features;
+}
+
+#endif /* !(_LINUX_IF_VLAN_H_) */