![Michał Mirosław](/assets/img/avatar_default.png)
Abstract CFI/DEI bit access consistently with other VLAN tag fields. Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl> Signed-off-by: David S. Miller <davem@davemloft.net>
769 lines
20 KiB
C
769 lines
20 KiB
C
/*
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* VLAN An implementation of 802.1Q VLAN tagging.
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*
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* Authors: Ben Greear <greearb@candelatech.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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*/
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#ifndef _LINUX_IF_VLAN_H_
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#define _LINUX_IF_VLAN_H_
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/rtnetlink.h>
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#include <linux/bug.h>
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#include <uapi/linux/if_vlan.h>
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#define VLAN_HLEN 4 /* The additional bytes required by VLAN
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* (in addition to the Ethernet header)
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*/
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#define VLAN_ETH_HLEN 18 /* Total octets in header. */
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#define VLAN_ETH_ZLEN 64 /* Min. octets in frame sans FCS */
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/*
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* According to 802.3ac, the packet can be 4 bytes longer. --Klika Jan
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*/
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#define VLAN_ETH_DATA_LEN 1500 /* Max. octets in payload */
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#define VLAN_ETH_FRAME_LEN 1518 /* Max. octets in frame sans FCS */
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/*
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* struct vlan_hdr - vlan header
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* @h_vlan_TCI: priority and VLAN ID
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* @h_vlan_encapsulated_proto: packet type ID or len
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*/
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struct vlan_hdr {
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__be16 h_vlan_TCI;
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__be16 h_vlan_encapsulated_proto;
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};
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/**
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* struct vlan_ethhdr - vlan ethernet header (ethhdr + vlan_hdr)
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* @h_dest: destination ethernet address
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* @h_source: source ethernet address
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* @h_vlan_proto: ethernet protocol
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* @h_vlan_TCI: priority and VLAN ID
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* @h_vlan_encapsulated_proto: packet type ID or len
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*/
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struct vlan_ethhdr {
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unsigned char h_dest[ETH_ALEN];
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unsigned char h_source[ETH_ALEN];
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__be16 h_vlan_proto;
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__be16 h_vlan_TCI;
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__be16 h_vlan_encapsulated_proto;
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};
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#include <linux/skbuff.h>
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static inline struct vlan_ethhdr *vlan_eth_hdr(const struct sk_buff *skb)
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{
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return (struct vlan_ethhdr *)skb_mac_header(skb);
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}
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#define VLAN_PRIO_MASK 0xe000 /* Priority Code Point */
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#define VLAN_PRIO_SHIFT 13
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#define VLAN_CFI_MASK 0x1000 /* Canonical Format Indicator / Drop Eligible Indicator */
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#define VLAN_VID_MASK 0x0fff /* VLAN Identifier */
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#define VLAN_N_VID 4096
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/* found in socket.c */
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extern void vlan_ioctl_set(int (*hook)(struct net *, void __user *));
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static inline bool is_vlan_dev(const struct net_device *dev)
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{
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return dev->priv_flags & IFF_802_1Q_VLAN;
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}
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#define skb_vlan_tag_present(__skb) ((__skb)->vlan_present)
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#define skb_vlan_tag_get(__skb) ((__skb)->vlan_tci)
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#define skb_vlan_tag_get_id(__skb) ((__skb)->vlan_tci & VLAN_VID_MASK)
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#define skb_vlan_tag_get_cfi(__skb) (!!((__skb)->vlan_tci & VLAN_CFI_MASK))
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#define skb_vlan_tag_get_prio(__skb) (((__skb)->vlan_tci & VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT)
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static inline int vlan_get_rx_ctag_filter_info(struct net_device *dev)
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{
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ASSERT_RTNL();
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return notifier_to_errno(call_netdevice_notifiers(NETDEV_CVLAN_FILTER_PUSH_INFO, dev));
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}
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static inline void vlan_drop_rx_ctag_filter_info(struct net_device *dev)
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{
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ASSERT_RTNL();
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call_netdevice_notifiers(NETDEV_CVLAN_FILTER_DROP_INFO, dev);
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}
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static inline int vlan_get_rx_stag_filter_info(struct net_device *dev)
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{
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ASSERT_RTNL();
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return notifier_to_errno(call_netdevice_notifiers(NETDEV_SVLAN_FILTER_PUSH_INFO, dev));
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}
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static inline void vlan_drop_rx_stag_filter_info(struct net_device *dev)
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{
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ASSERT_RTNL();
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call_netdevice_notifiers(NETDEV_SVLAN_FILTER_DROP_INFO, dev);
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}
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/**
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* struct vlan_pcpu_stats - VLAN percpu rx/tx stats
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* @rx_packets: number of received packets
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* @rx_bytes: number of received bytes
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* @rx_multicast: number of received multicast packets
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* @tx_packets: number of transmitted packets
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* @tx_bytes: number of transmitted bytes
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* @syncp: synchronization point for 64bit counters
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* @rx_errors: number of rx errors
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* @tx_dropped: number of tx drops
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*/
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struct vlan_pcpu_stats {
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u64 rx_packets;
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u64 rx_bytes;
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u64 rx_multicast;
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u64 tx_packets;
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u64 tx_bytes;
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struct u64_stats_sync syncp;
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u32 rx_errors;
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u32 tx_dropped;
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};
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#if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE)
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extern struct net_device *__vlan_find_dev_deep_rcu(struct net_device *real_dev,
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__be16 vlan_proto, u16 vlan_id);
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extern int vlan_for_each(struct net_device *dev,
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int (*action)(struct net_device *dev, int vid,
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void *arg), void *arg);
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extern struct net_device *vlan_dev_real_dev(const struct net_device *dev);
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extern u16 vlan_dev_vlan_id(const struct net_device *dev);
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extern __be16 vlan_dev_vlan_proto(const struct net_device *dev);
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/**
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* struct vlan_priority_tci_mapping - vlan egress priority mappings
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* @priority: skb priority
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* @vlan_qos: vlan priority: (skb->priority << 13) & 0xE000
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* @next: pointer to next struct
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*/
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struct vlan_priority_tci_mapping {
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u32 priority;
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u16 vlan_qos;
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struct vlan_priority_tci_mapping *next;
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};
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struct proc_dir_entry;
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struct netpoll;
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/**
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* struct vlan_dev_priv - VLAN private device data
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* @nr_ingress_mappings: number of ingress priority mappings
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* @ingress_priority_map: ingress priority mappings
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* @nr_egress_mappings: number of egress priority mappings
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* @egress_priority_map: hash of egress priority mappings
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* @vlan_proto: VLAN encapsulation protocol
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* @vlan_id: VLAN identifier
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* @flags: device flags
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* @real_dev: underlying netdevice
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* @real_dev_addr: address of underlying netdevice
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* @dent: proc dir entry
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* @vlan_pcpu_stats: ptr to percpu rx stats
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*/
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struct vlan_dev_priv {
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unsigned int nr_ingress_mappings;
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u32 ingress_priority_map[8];
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unsigned int nr_egress_mappings;
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struct vlan_priority_tci_mapping *egress_priority_map[16];
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__be16 vlan_proto;
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u16 vlan_id;
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u16 flags;
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struct net_device *real_dev;
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unsigned char real_dev_addr[ETH_ALEN];
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struct proc_dir_entry *dent;
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struct vlan_pcpu_stats __percpu *vlan_pcpu_stats;
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#ifdef CONFIG_NET_POLL_CONTROLLER
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struct netpoll *netpoll;
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#endif
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unsigned int nest_level;
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};
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static inline struct vlan_dev_priv *vlan_dev_priv(const struct net_device *dev)
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{
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return netdev_priv(dev);
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}
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static inline u16
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vlan_dev_get_egress_qos_mask(struct net_device *dev, u32 skprio)
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{
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struct vlan_priority_tci_mapping *mp;
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smp_rmb(); /* coupled with smp_wmb() in vlan_dev_set_egress_priority() */
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mp = vlan_dev_priv(dev)->egress_priority_map[(skprio & 0xF)];
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while (mp) {
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if (mp->priority == skprio) {
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return mp->vlan_qos; /* This should already be shifted
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* to mask correctly with the
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* VLAN's TCI */
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}
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mp = mp->next;
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}
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return 0;
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}
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extern bool vlan_do_receive(struct sk_buff **skb);
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extern int vlan_vid_add(struct net_device *dev, __be16 proto, u16 vid);
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extern void vlan_vid_del(struct net_device *dev, __be16 proto, u16 vid);
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extern int vlan_vids_add_by_dev(struct net_device *dev,
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const struct net_device *by_dev);
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extern void vlan_vids_del_by_dev(struct net_device *dev,
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const struct net_device *by_dev);
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extern bool vlan_uses_dev(const struct net_device *dev);
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static inline int vlan_get_encap_level(struct net_device *dev)
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{
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BUG_ON(!is_vlan_dev(dev));
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return vlan_dev_priv(dev)->nest_level;
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}
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#else
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static inline struct net_device *
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__vlan_find_dev_deep_rcu(struct net_device *real_dev,
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__be16 vlan_proto, u16 vlan_id)
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{
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return NULL;
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}
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static inline int
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vlan_for_each(struct net_device *dev,
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int (*action)(struct net_device *dev, int vid, void *arg),
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void *arg)
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{
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return 0;
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}
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static inline struct net_device *vlan_dev_real_dev(const struct net_device *dev)
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{
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BUG();
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return NULL;
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}
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static inline u16 vlan_dev_vlan_id(const struct net_device *dev)
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{
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BUG();
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return 0;
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}
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static inline __be16 vlan_dev_vlan_proto(const struct net_device *dev)
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{
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BUG();
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return 0;
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}
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static inline u16 vlan_dev_get_egress_qos_mask(struct net_device *dev,
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u32 skprio)
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{
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return 0;
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}
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static inline bool vlan_do_receive(struct sk_buff **skb)
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{
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return false;
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}
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static inline int vlan_vid_add(struct net_device *dev, __be16 proto, u16 vid)
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{
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return 0;
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}
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static inline void vlan_vid_del(struct net_device *dev, __be16 proto, u16 vid)
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{
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}
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static inline int vlan_vids_add_by_dev(struct net_device *dev,
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const struct net_device *by_dev)
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{
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return 0;
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}
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static inline void vlan_vids_del_by_dev(struct net_device *dev,
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const struct net_device *by_dev)
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{
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}
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static inline bool vlan_uses_dev(const struct net_device *dev)
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{
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return false;
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}
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static inline int vlan_get_encap_level(struct net_device *dev)
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{
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BUG();
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return 0;
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}
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#endif
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/**
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* eth_type_vlan - check for valid vlan ether type.
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* @ethertype: ether type to check
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*
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* Returns true if the ether type is a vlan ether type.
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*/
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static inline bool eth_type_vlan(__be16 ethertype)
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{
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switch (ethertype) {
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case htons(ETH_P_8021Q):
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case htons(ETH_P_8021AD):
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return true;
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default:
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return false;
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}
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}
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static inline bool vlan_hw_offload_capable(netdev_features_t features,
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__be16 proto)
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{
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if (proto == htons(ETH_P_8021Q) && features & NETIF_F_HW_VLAN_CTAG_TX)
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return true;
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if (proto == htons(ETH_P_8021AD) && features & NETIF_F_HW_VLAN_STAG_TX)
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return true;
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return false;
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}
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/**
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* __vlan_insert_inner_tag - inner VLAN tag inserting
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* @skb: skbuff to tag
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* @vlan_proto: VLAN encapsulation protocol
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* @vlan_tci: VLAN TCI to insert
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* @mac_len: MAC header length including outer vlan headers
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*
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* Inserts the VLAN tag into @skb as part of the payload at offset mac_len
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* Returns error if skb_cow_head fails.
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*
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* Does not change skb->protocol so this function can be used during receive.
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*/
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static inline int __vlan_insert_inner_tag(struct sk_buff *skb,
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__be16 vlan_proto, u16 vlan_tci,
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unsigned int mac_len)
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{
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struct vlan_ethhdr *veth;
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if (skb_cow_head(skb, VLAN_HLEN) < 0)
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return -ENOMEM;
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skb_push(skb, VLAN_HLEN);
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/* Move the mac header sans proto to the beginning of the new header. */
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if (likely(mac_len > ETH_TLEN))
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memmove(skb->data, skb->data + VLAN_HLEN, mac_len - ETH_TLEN);
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skb->mac_header -= VLAN_HLEN;
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veth = (struct vlan_ethhdr *)(skb->data + mac_len - ETH_HLEN);
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/* first, the ethernet type */
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if (likely(mac_len >= ETH_TLEN)) {
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/* h_vlan_encapsulated_proto should already be populated, and
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* skb->data has space for h_vlan_proto
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*/
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veth->h_vlan_proto = vlan_proto;
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} else {
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/* h_vlan_encapsulated_proto should not be populated, and
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* skb->data has no space for h_vlan_proto
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*/
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veth->h_vlan_encapsulated_proto = skb->protocol;
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}
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/* now, the TCI */
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veth->h_vlan_TCI = htons(vlan_tci);
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return 0;
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}
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/**
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* __vlan_insert_tag - regular VLAN tag inserting
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* @skb: skbuff to tag
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* @vlan_proto: VLAN encapsulation protocol
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* @vlan_tci: VLAN TCI to insert
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*
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* Inserts the VLAN tag into @skb as part of the payload
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* Returns error if skb_cow_head fails.
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*
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* Does not change skb->protocol so this function can be used during receive.
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*/
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static inline int __vlan_insert_tag(struct sk_buff *skb,
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__be16 vlan_proto, u16 vlan_tci)
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{
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return __vlan_insert_inner_tag(skb, vlan_proto, vlan_tci, ETH_HLEN);
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}
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/**
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* vlan_insert_inner_tag - inner VLAN tag inserting
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* @skb: skbuff to tag
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* @vlan_proto: VLAN encapsulation protocol
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* @vlan_tci: VLAN TCI to insert
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* @mac_len: MAC header length including outer vlan headers
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*
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* Inserts the VLAN tag into @skb as part of the payload at offset mac_len
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* Returns a VLAN tagged skb. If a new skb is created, @skb is freed.
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*
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* Following the skb_unshare() example, in case of error, the calling function
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* doesn't have to worry about freeing the original skb.
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*
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* Does not change skb->protocol so this function can be used during receive.
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*/
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static inline struct sk_buff *vlan_insert_inner_tag(struct sk_buff *skb,
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__be16 vlan_proto,
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u16 vlan_tci,
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unsigned int mac_len)
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{
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int err;
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err = __vlan_insert_inner_tag(skb, vlan_proto, vlan_tci, mac_len);
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if (err) {
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dev_kfree_skb_any(skb);
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return NULL;
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}
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return skb;
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}
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/**
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* vlan_insert_tag - regular VLAN tag inserting
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* @skb: skbuff to tag
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* @vlan_proto: VLAN encapsulation protocol
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* @vlan_tci: VLAN TCI to insert
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*
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* Inserts the VLAN tag into @skb as part of the payload
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* Returns a VLAN tagged skb. If a new skb is created, @skb is freed.
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*
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* Following the skb_unshare() example, in case of error, the calling function
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* doesn't have to worry about freeing the original skb.
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*
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* Does not change skb->protocol so this function can be used during receive.
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*/
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static inline struct sk_buff *vlan_insert_tag(struct sk_buff *skb,
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__be16 vlan_proto, u16 vlan_tci)
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{
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return vlan_insert_inner_tag(skb, vlan_proto, vlan_tci, ETH_HLEN);
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}
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/**
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* vlan_insert_tag_set_proto - regular VLAN tag inserting
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* @skb: skbuff to tag
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* @vlan_proto: VLAN encapsulation protocol
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* @vlan_tci: VLAN TCI to insert
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*
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* Inserts the VLAN tag into @skb as part of the payload
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* Returns a VLAN tagged skb. If a new skb is created, @skb is freed.
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*
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* Following the skb_unshare() example, in case of error, the calling function
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* doesn't have to worry about freeing the original skb.
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*/
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static inline struct sk_buff *vlan_insert_tag_set_proto(struct sk_buff *skb,
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__be16 vlan_proto,
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u16 vlan_tci)
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{
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skb = vlan_insert_tag(skb, vlan_proto, vlan_tci);
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if (skb)
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skb->protocol = vlan_proto;
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return skb;
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}
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/**
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* __vlan_hwaccel_clear_tag - clear hardware accelerated VLAN info
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* @skb: skbuff to clear
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*
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* Clears the VLAN information from @skb
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*/
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static inline void __vlan_hwaccel_clear_tag(struct sk_buff *skb)
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{
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skb->vlan_present = 0;
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}
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/**
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* __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(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 (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 *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 (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(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 (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_) */
|