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/* SPDX-License-Identifier: GPL-2.0-or-later / / * VLAN An implementation of 802.1Q VLAN tagging. * * Authors: Ben Greear <greearb@candelatech.com> / #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 / #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 { 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 / 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 )); static inline bool is_vlan_dev(const struct net_device dev) { return dev->priv_flags & IFF_802_1Q_VLAN; } #define skb_vlan_tag_present(__skb) ((__skb)->vlan_present) #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 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 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 / 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 }; 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); #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 int vlan_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) { 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; } #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 * Returns error if skb_cow_head fails. * * Does not change skb->protocol so this function can be used during receive. / static inline int __vlan_insert_inner_tag(struct sk_buff skb, __be16 vlan_proto, u16 vlan_tci, unsigned int mac_len) { struct vlan_ethhdr veth; if (skb_cow_head(skb, 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)) memmove(skb->data, skb->data + VLAN_HLEN, mac_len - ETH_TLEN); 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 * Returns error if skb_cow_head fails. * * 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) { 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. 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_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. 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) { 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. 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_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_present = 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_present = src->vlan_present; dst->vlan_proto = src->vlan_proto; dst->vlan_tci = src->vlan_tci; } / * __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; skb->vlan_present = 1; } /** * __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 (!eth_type_vlan(veth->h_vlan_proto)) 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 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; } } /* * 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); } } /* * 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(const struct sk_buff skb, __be16 type, int depth) { unsigned int vlan_depth = skb->mac_len, parse_depth = VLAN_MAX_DEPTH; / 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 (eth_type_vlan(type)) { 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 vhdr, vh; vh = skb_header_pointer(skb, vlan_depth, sizeof(vhdr), &vhdr); if (unlikely(!vh \|\| !--parse_depth)) return 0; type = vh->h_vlan_encapsulated_proto; vlan_depth += VLAN_HLEN; } while (eth_type_vlan(type)); } 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(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); } /* * 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 = (struct vlan_ethhdr )skb->data; 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, 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 } #endif / !(_LINUX_IF_VLAN_H_) */

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