cregit-Linux how code gets into the kernel

Release 4.7 include/linux/if_vlan.h

Directory: include/linux
/*
 * 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); }

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#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(const struct net_device *dev) { return dev->priv_flags & IFF_802_1Q_VLAN; }

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#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); }

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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; }

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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; }

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#else
static inline struct net_device * __vlan_find_dev_deep_rcu(struct net_device *real_dev, __be16 vlan_proto, u16 vlan_id) { return NULL; }

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static inline struct net_device *vlan_dev_real_dev(const struct net_device *dev) { BUG(); return NULL; }

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static inline u16 vlan_dev_vlan_id(const struct net_device *dev) { BUG(); return 0; }

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static inline __be16 vlan_dev_vlan_proto(const struct net_device *dev) { BUG(); return 0; }

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static inline u16 vlan_dev_get_egress_qos_mask(struct net_device *dev, u32 skprio) { return 0; }

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static inline bool vlan_do_receive(struct sk_buff **skb) { return false; }

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static inline int vlan_vid_add(struct net_device *dev, __be16 proto, u16 vid) { return 0; }

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static inline void vlan_vid_del(struct net_device *dev, __be16 proto, u16 vid) { }

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static inline int vlan_vids_add_by_dev(struct net_device *dev, const struct net_device *by_dev) { return 0; }

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static inline void vlan_vids_del_by_dev(struct net_device *dev, const struct net_device *by_dev) { }

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static inline bool vlan_uses_dev(const struct net_device *dev) { return false; }

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static inline int vlan_get_encap_level(struct net_device *dev) { BUG(); return 0; }

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#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; }

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/** * __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; }

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/** * 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; }

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/** * 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; }

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/* * __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; }

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/* * 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; }

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/** * __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; }

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/** * __vlan_get_tag - get the VLAN ID that is part of the payload * @skb: skbuff to query * @vlan_tci: buffer to store value * * 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; }

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/** * __vlan_hwaccel_get_tag - get the VLAN ID that is in @skb->cb[] * @skb: skbuff to query * @vlan_tci: buffer to store value * * 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; } }

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#define HAVE_VLAN_GET_TAG /** * vlan_get_tag - get the VLAN ID from the skb * @skb: skbuff to query * @vlan_tci: buffer to store value * * 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); } }

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/** * 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; }

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/** * 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); }

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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 (eth_proto_is_802_3(proto)) { 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); }

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/** * 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; }

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/** * 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; }

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/** * 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_HW_CSUM | NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX); return features; }

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/** * compare_vlan_header - Compare two vlan headers * @h1: Pointer to vlan header * @h2: Pointer to vlan header * * Compare two vlan headers, returns 0 if equal. * * Please note that alignment of h1 & h2 are only guaranteed to be 16 bits. */
static inline unsigned long compare_vlan_header(const struct vlan_hdr *h1, const struct vlan_hdr *h2) { #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) return *(u32 *)h1 ^ *(u32 *)h2; #else return ((__force u32)h1->h_vlan_TCI ^ (__force u32)h2->h_vlan_TCI) | ((__force u32)h1->h_vlan_encapsulated_proto ^ (__force u32)h2->h_vlan_encapsulated_proto); #endif }

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#endif /* !(_LINUX_IF_VLAN_H_) */

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shmulik henshmulik hen23112.10%11.47%
david s. millerdavid s. miller1879.80%22.94%
pravin b shelarpravin b shelar784.09%11.47%
linus torvaldslinus torvalds723.77%11.47%
vlad yasevichvlad yasevich522.72%22.94%
hao zhenghao zheng432.25%11.47%
ding tianhongding tianhong321.68%22.94%
hannes frederic sowahannes frederic sowa311.62%11.47%
eyal perryeyal perry301.57%11.47%
arnaldo carvalho de meloarnaldo carvalho de melo291.52%22.94%
eric dumazeteric dumazet271.41%22.94%
neil hormanneil horman180.94%11.47%
jesse grossjesse gross160.84%34.41%
americo wangamerico wang100.52%11.47%
stephen hemmingerstephen hemminger80.42%22.94%
jarek poplawskijarek poplawski60.31%11.47%
florian zumbiehlflorian zumbiehl50.26%11.47%
eric w. biedermaneric w. biederman40.21%11.47%
david howellsdavid howells30.16%11.47%
alexey dobriyanalexey dobriyan30.16%22.94%
vivien didelotvivien didelot30.16%11.47%
al viroal viro30.16%11.47%
paul gortmakerpaul gortmaker30.16%11.47%
joe perchesjoe perches20.10%11.47%
olaf heringolaf hering10.05%11.47%
herbert xuherbert xu10.05%11.47%
tom herberttom herbert10.05%11.47%
alexander duyckalexander duyck10.05%11.47%
Total1909100.00%68100.00%
Directory: include/linux
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