| /* 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); |
| } |
| |
| /* 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_) */ |