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#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 */
#define VLAN_MAX_DEPTH 8 /* Max. number of nested VLAN tags parsed */
/* * 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 { struct_group(addrs, 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);}
/* Prefer this version in TX path, instead of * skb_reset_mac_header() + vlan_eth_hdr() */static inline struct vlan_ethhdr *skb_vlan_eth_hdr(const struct sk_buff *skb){ return (struct vlan_ethhdr *)skb->data;}
#define VLAN_PRIO_MASK 0xe000 /* Priority Code Point */#define VLAN_PRIO_SHIFT 13#define VLAN_CFI_MASK 0x1000 /* Canonical Format Indicator / Drop Eligible Indicator */#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 *));
#define skb_vlan_tag_present(__skb) (!!(__skb)->vlan_all)#define skb_vlan_tag_get(__skb) ((__skb)->vlan_tci)#define skb_vlan_tag_get_id(__skb) ((__skb)->vlan_tci & VLAN_VID_MASK)#define skb_vlan_tag_get_cfi(__skb) (!!((__skb)->vlan_tci & VLAN_CFI_MASK))#define skb_vlan_tag_get_prio(__skb) (((__skb)->vlan_tci & VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT)
static inline int vlan_get_rx_ctag_filter_info(struct net_device *dev){ ASSERT_RTNL(); return notifier_to_errno(call_netdevice_notifiers(NETDEV_CVLAN_FILTER_PUSH_INFO, dev));}
static inline void vlan_drop_rx_ctag_filter_info(struct net_device *dev){ ASSERT_RTNL(); call_netdevice_notifiers(NETDEV_CVLAN_FILTER_DROP_INFO, dev);}
static inline int vlan_get_rx_stag_filter_info(struct net_device *dev){ ASSERT_RTNL(); return notifier_to_errno(call_netdevice_notifiers(NETDEV_SVLAN_FILTER_PUSH_INFO, dev));}
static inline void vlan_drop_rx_stag_filter_info(struct net_device *dev){ ASSERT_RTNL(); call_netdevice_notifiers(NETDEV_SVLAN_FILTER_DROP_INFO, dev);}
/** * 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_stats_t rx_packets; u64_stats_t rx_bytes; u64_stats_t rx_multicast; u64_stats_t tx_packets; u64_stats_t tx_bytes; struct u64_stats_sync syncp; u32 rx_errors; u32 tx_dropped;};
#if IS_ENABLED(CONFIG_VLAN_8021Q)
extern struct net_device *__vlan_find_dev_deep_rcu(struct net_device *real_dev, __be16 vlan_proto, u16 vlan_id);extern int vlan_for_each(struct net_device *dev, int (*action)(struct net_device *dev, int vid, void *arg), void *arg);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 * @rcu: used for deferred freeing of mapping nodes */struct vlan_priority_tci_mapping { u32 priority; u16 vlan_qos; struct vlan_priority_tci_mapping __rcu *next; struct rcu_head rcu;};
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 * @dev_tracker: refcount tracker for @real_dev reference * @real_dev_addr: address of underlying netdevice * @dent: proc dir entry * @vlan_pcpu_stats: ptr to percpu rx stats * @netpoll: netpoll instance "propagated" down to @real_dev */struct vlan_dev_priv { unsigned int nr_ingress_mappings; u32 ingress_priority_map[8]; unsigned int nr_egress_mappings; struct vlan_priority_tci_mapping __rcu *egress_priority_map[16];
__be16 vlan_proto; u16 vlan_id; u16 flags;
struct net_device *real_dev; netdevice_tracker dev_tracker;
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};
static inline bool is_vlan_dev(const struct net_device *dev){ return dev->priv_flags & IFF_802_1Q_VLAN;}
static inline struct vlan_dev_priv *vlan_dev_priv(const struct net_device *dev){ return netdev_priv(dev);}
static inline u16vlan_dev_get_egress_qos_mask(struct net_device *dev, u32 skprio){ struct vlan_priority_tci_mapping *mp; u16 vlan_qos = 0;
rcu_read_lock();
mp = rcu_dereference(vlan_dev_priv(dev)->egress_priority_map[skprio & 0xF]); while (mp) { if (mp->priority == skprio) { vlan_qos = READ_ONCE(mp->vlan_qos); break; } mp = rcu_dereference(mp->next); } rcu_read_unlock();
/* This should already be shifted to mask correctly with * the VLAN's TCI. */ return vlan_qos;}
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);
#elsestatic inline bool is_vlan_dev(const struct net_device *dev){ return false;}
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 intvlan_for_each(struct net_device *dev, int (*action)(struct net_device *dev, int vid, void *arg), void *arg){ return 0;}
static inline struct net_device *vlan_dev_real_dev(const struct net_device *dev){ WARN_ON_ONCE(1); return NULL;}
static inline u16 vlan_dev_vlan_id(const struct net_device *dev){ WARN_ON_ONCE(1); return 0;}
static inline __be16 vlan_dev_vlan_proto(const struct net_device *dev){ WARN_ON_ONCE(1); 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;}#endif
/** * eth_type_vlan - check for valid vlan ether type. * @ethertype: ether type to check * * Returns: true if the ether type is a vlan ether type. */static inline bool eth_type_vlan(__be16 ethertype){ switch (ethertype) { case htons(ETH_P_8021Q): case htons(ETH_P_8021AD): return true; default: return false; }}
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_inner_tag - inner VLAN tag inserting * @skb: skbuff to tag * @vlan_proto: VLAN encapsulation protocol * @vlan_tci: VLAN TCI to insert * @mac_len: MAC header length including outer vlan headers * * Inserts the VLAN tag into @skb as part of the payload at offset mac_len * Does not change skb->protocol so this function can be used during receive. * * Returns: error if skb_cow_head fails. */static inline int __vlan_insert_inner_tag(struct sk_buff *skb, __be16 vlan_proto, u16 vlan_tci, unsigned int mac_len){ const u8 meta_len = mac_len > ETH_TLEN ? skb_metadata_len(skb) : 0; struct vlan_ethhdr *veth;
if (unlikely(!pskb_may_pull(skb, mac_len))) return -EINVAL;
if (skb_cow_head(skb, meta_len + VLAN_HLEN) < 0) return -ENOMEM;
skb_push(skb, VLAN_HLEN);
/* Move the mac header sans proto to the beginning of the new header. */ if (likely(mac_len > ETH_TLEN)) skb_postpush_data_move(skb, VLAN_HLEN, mac_len - ETH_TLEN); if (skb_mac_header_was_set(skb)) skb->mac_header -= VLAN_HLEN;
veth = (struct vlan_ethhdr *)(skb->data + mac_len - ETH_HLEN);
/* first, the ethernet type */ if (likely(mac_len >= ETH_TLEN)) { /* h_vlan_encapsulated_proto should already be populated, and * skb->data has space for h_vlan_proto */ veth->h_vlan_proto = vlan_proto; } else { /* h_vlan_encapsulated_proto should not be populated, and * skb->data has no space for h_vlan_proto */ veth->h_vlan_encapsulated_proto = skb->protocol; }
/* 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 * Does not change skb->protocol so this function can be used during receive. * * Returns: error if skb_cow_head fails. */static inline int __vlan_insert_tag(struct sk_buff *skb, __be16 vlan_proto, u16 vlan_tci){ return __vlan_insert_inner_tag(skb, vlan_proto, vlan_tci, ETH_HLEN);}
/** * vlan_insert_inner_tag - inner VLAN tag inserting * @skb: skbuff to tag * @vlan_proto: VLAN encapsulation protocol * @vlan_tci: VLAN TCI to insert * @mac_len: MAC header length including outer vlan headers * * Inserts the VLAN tag into @skb as part of the payload at offset mac_len * Returns a VLAN tagged skb. This might change skb->head. * * 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. * * Return: modified @skb on success, NULL on error (@skb is freed). */static inline struct sk_buff *vlan_insert_inner_tag(struct sk_buff *skb, __be16 vlan_proto, u16 vlan_tci, unsigned int mac_len){ int err;
err = __vlan_insert_inner_tag(skb, vlan_proto, vlan_tci, mac_len); if (err) { dev_kfree_skb_any(skb); return NULL; } return skb;}
/** * 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. This might change skb->head. * * 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. * * Return: modified @skb on success, NULL on error (@skb is freed). */static inline struct sk_buff *vlan_insert_tag(struct sk_buff *skb, __be16 vlan_proto, u16 vlan_tci){ return vlan_insert_inner_tag(skb, vlan_proto, vlan_tci, ETH_HLEN);}
/** * 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. This might change skb->head. * * Following the skb_unshare() example, in case of error, the calling function * doesn't have to worry about freeing the original skb. * * Return: modified @skb on success, NULL on error (@skb is freed). */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_clear_tag - clear hardware accelerated VLAN info * @skb: skbuff to clear * * Clears the VLAN information from @skb */static inline void __vlan_hwaccel_clear_tag(struct sk_buff *skb){ skb->vlan_all = 0;}
/** * __vlan_hwaccel_copy_tag - copy hardware accelerated VLAN info from another skb * @dst: skbuff to copy to * @src: skbuff to copy from * * Copies VLAN information from @src to @dst (for branchless code) */static inline void __vlan_hwaccel_copy_tag(struct sk_buff *dst, const struct sk_buff *src){ dst->vlan_all = src->vlan_all;}
/* * __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)) __vlan_hwaccel_clear_tag(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_tci;}
/** * __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 = skb_vlan_eth_hdr(skb);
if (!eth_type_vlan(veth->h_vlan_proto)) return -ENODATA;
*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 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 -ENODATA; }}
/** * 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); }}
struct vlan_type_depth { __be16 type; u16 depth;};
struct vlan_type_depth __vlan_get_protocol_offset(const struct sk_buff *skb, __be16 type, int mac_offset);
/** * vlan_get_protocol_offset_inline() - get protocol EtherType. * @skb: skbuff to query * @type: first vlan protocol * @mac_offset: MAC offset * @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_offset_inline(const struct sk_buff *skb, __be16 type, int mac_offset, int *depth){ if (eth_type_vlan(type)) { struct vlan_type_depth res;
res = __vlan_get_protocol_offset(skb, type, mac_offset);
if (depth && res.type) *depth = res.depth; return res.type; }
if (depth) *depth = skb->mac_len;
return type;}
static inline __be16 __vlan_get_protocol(const struct sk_buff *skb, __be16 type, int *depth){ return vlan_get_protocol_offset_inline(skb, type, 0, depth);}
/** * 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(const struct sk_buff *skb){ return __vlan_get_protocol(skb, skb->protocol, NULL);}
/* This version of __vlan_get_protocol() also pulls mac header in skb->head */static inline __be16 vlan_get_protocol_and_depth(struct sk_buff *skb, __be16 type, int *depth){ int maclen;
type = __vlan_get_protocol(skb, type, &maclen);
if (type) { if (!pskb_may_pull(skb, maclen)) type = 0; else if (depth) *depth = maclen; } return type;}
/* A getter for the SKB protocol field which will handle VLAN tags consistently * whether VLAN acceleration is enabled or not. */static inline __be16 skb_protocol(const struct sk_buff *skb, bool skip_vlan){ if (!skip_vlan) /* VLAN acceleration strips the VLAN header from the skb and * moves it to skb->vlan_proto */ return skb_vlan_tag_present(skb) ? skb->vlan_proto : skb->protocol;
return vlan_get_protocol(skb);}
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);}
/** * vlan_remove_tag - remove outer VLAN tag from payload * @skb: skbuff to remove tag from * @vlan_tci: buffer to store value * * Expects the skb to contain a VLAN tag in the payload, and to have skb->data * pointing at the MAC header. */static inline void vlan_remove_tag(struct sk_buff *skb, u16 *vlan_tci){ struct vlan_hdr *vhdr = (struct vlan_hdr *)(skb->data + ETH_HLEN);
*vlan_tci = ntohs(vhdr->h_vlan_TCI);
vlan_set_encap_proto(skb, vhdr); __skb_pull(skb, VLAN_HLEN); skb_postpull_data_move(skb, VLAN_HLEN, 2 * ETH_ALEN);}
/** * 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(!eth_type_vlan(skb->protocol))) 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(struct sk_buff *skb){ __be16 protocol = skb->protocol;
if (!skb_vlan_tag_present(skb)) { struct vlan_ethhdr *veh;
if (likely(!eth_type_vlan(protocol))) return false;
if (unlikely(!pskb_may_pull(skb, VLAN_ETH_HLEN))) return false;
veh = skb_vlan_eth_hdr(skb); protocol = veh->h_vlan_encapsulated_proto; }
if (!eth_type_vlan(protocol)) 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(struct sk_buff *skb, netdev_features_t features){ if (skb_vlan_tagged_multi(skb)) { /* In the case of multi-tagged packets, use a direct mask * instead of using netdev_interesect_features(), to make * sure that only devices supporting NETIF_F_HW_CSUM will * have checksum offloading support. */ features &= NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST | NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX; }
return features;}
/** * compare_vlan_header - Compare two vlan headers * @h1: Pointer to vlan header * @h2: Pointer to vlan header * * Compare two vlan headers. * * Please note that alignment of h1 & h2 are only guaranteed to be 16 bits. * * Return: 0 if equal, arbitrary non-zero value if not equal. */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}#endif /* !(_LINUX_IF_VLAN_H_) */