vlan.h (6474B)
1/* SPDX-License-Identifier: GPL-2.0 */ 2#ifndef __BEN_VLAN_802_1Q_INC__ 3#define __BEN_VLAN_802_1Q_INC__ 4 5#include <linux/if_vlan.h> 6#include <linux/u64_stats_sync.h> 7#include <linux/list.h> 8 9/* if this changes, algorithm will have to be reworked because this 10 * depends on completely exhausting the VLAN identifier space. Thus 11 * it gives constant time look-up, but in many cases it wastes memory. 12 */ 13#define VLAN_GROUP_ARRAY_SPLIT_PARTS 8 14#define VLAN_GROUP_ARRAY_PART_LEN (VLAN_N_VID/VLAN_GROUP_ARRAY_SPLIT_PARTS) 15 16enum vlan_protos { 17 VLAN_PROTO_8021Q = 0, 18 VLAN_PROTO_8021AD, 19 VLAN_PROTO_NUM, 20}; 21 22struct vlan_group { 23 unsigned int nr_vlan_devs; 24 struct hlist_node hlist; /* linked list */ 25 struct net_device **vlan_devices_arrays[VLAN_PROTO_NUM] 26 [VLAN_GROUP_ARRAY_SPLIT_PARTS]; 27}; 28 29struct vlan_info { 30 struct net_device *real_dev; /* The ethernet(like) device 31 * the vlan is attached to. 32 */ 33 struct vlan_group grp; 34 struct list_head vid_list; 35 unsigned int nr_vids; 36 struct rcu_head rcu; 37}; 38 39static inline int vlan_proto_idx(__be16 proto) 40{ 41 switch (proto) { 42 case htons(ETH_P_8021Q): 43 return VLAN_PROTO_8021Q; 44 case htons(ETH_P_8021AD): 45 return VLAN_PROTO_8021AD; 46 default: 47 WARN(1, "invalid VLAN protocol: 0x%04x\n", ntohs(proto)); 48 return -EINVAL; 49 } 50} 51 52static inline struct net_device *__vlan_group_get_device(struct vlan_group *vg, 53 unsigned int pidx, 54 u16 vlan_id) 55{ 56 struct net_device **array; 57 58 array = vg->vlan_devices_arrays[pidx] 59 [vlan_id / VLAN_GROUP_ARRAY_PART_LEN]; 60 61 /* paired with smp_wmb() in vlan_group_prealloc_vid() */ 62 smp_rmb(); 63 64 return array ? array[vlan_id % VLAN_GROUP_ARRAY_PART_LEN] : NULL; 65} 66 67static inline struct net_device *vlan_group_get_device(struct vlan_group *vg, 68 __be16 vlan_proto, 69 u16 vlan_id) 70{ 71 int pidx = vlan_proto_idx(vlan_proto); 72 73 if (pidx < 0) 74 return NULL; 75 76 return __vlan_group_get_device(vg, pidx, vlan_id); 77} 78 79static inline void vlan_group_set_device(struct vlan_group *vg, 80 __be16 vlan_proto, u16 vlan_id, 81 struct net_device *dev) 82{ 83 int pidx = vlan_proto_idx(vlan_proto); 84 struct net_device **array; 85 86 if (!vg || pidx < 0) 87 return; 88 array = vg->vlan_devices_arrays[pidx] 89 [vlan_id / VLAN_GROUP_ARRAY_PART_LEN]; 90 array[vlan_id % VLAN_GROUP_ARRAY_PART_LEN] = dev; 91} 92 93/* Must be invoked with rcu_read_lock or with RTNL. */ 94static inline struct net_device *vlan_find_dev(struct net_device *real_dev, 95 __be16 vlan_proto, u16 vlan_id) 96{ 97 struct vlan_info *vlan_info = rcu_dereference_rtnl(real_dev->vlan_info); 98 99 if (vlan_info) 100 return vlan_group_get_device(&vlan_info->grp, 101 vlan_proto, vlan_id); 102 103 return NULL; 104} 105 106static inline netdev_features_t vlan_tnl_features(struct net_device *real_dev) 107{ 108 netdev_features_t ret; 109 110 ret = real_dev->hw_enc_features & 111 (NETIF_F_CSUM_MASK | NETIF_F_GSO_SOFTWARE | 112 NETIF_F_GSO_ENCAP_ALL); 113 114 if ((ret & NETIF_F_GSO_ENCAP_ALL) && (ret & NETIF_F_CSUM_MASK)) 115 return (ret & ~NETIF_F_CSUM_MASK) | NETIF_F_HW_CSUM; 116 return 0; 117} 118 119#define vlan_group_for_each_dev(grp, i, dev) \ 120 for ((i) = 0; i < VLAN_PROTO_NUM * VLAN_N_VID; i++) \ 121 if (((dev) = __vlan_group_get_device((grp), (i) / VLAN_N_VID, \ 122 (i) % VLAN_N_VID))) 123 124int vlan_filter_push_vids(struct vlan_info *vlan_info, __be16 proto); 125void vlan_filter_drop_vids(struct vlan_info *vlan_info, __be16 proto); 126 127/* found in vlan_dev.c */ 128void vlan_dev_set_ingress_priority(const struct net_device *dev, 129 u32 skb_prio, u16 vlan_prio); 130int vlan_dev_set_egress_priority(const struct net_device *dev, 131 u32 skb_prio, u16 vlan_prio); 132void vlan_dev_free_egress_priority(const struct net_device *dev); 133int vlan_dev_change_flags(const struct net_device *dev, u32 flag, u32 mask); 134void vlan_dev_get_realdev_name(const struct net_device *dev, char *result, 135 size_t size); 136 137int vlan_check_real_dev(struct net_device *real_dev, 138 __be16 protocol, u16 vlan_id, 139 struct netlink_ext_ack *extack); 140void vlan_setup(struct net_device *dev); 141int register_vlan_dev(struct net_device *dev, struct netlink_ext_ack *extack); 142void unregister_vlan_dev(struct net_device *dev, struct list_head *head); 143bool vlan_dev_inherit_address(struct net_device *dev, 144 struct net_device *real_dev); 145 146static inline u32 vlan_get_ingress_priority(struct net_device *dev, 147 u16 vlan_tci) 148{ 149 struct vlan_dev_priv *vip = vlan_dev_priv(dev); 150 151 return vip->ingress_priority_map[(vlan_tci >> VLAN_PRIO_SHIFT) & 0x7]; 152} 153 154#ifdef CONFIG_VLAN_8021Q_GVRP 155int vlan_gvrp_request_join(const struct net_device *dev); 156void vlan_gvrp_request_leave(const struct net_device *dev); 157int vlan_gvrp_init_applicant(struct net_device *dev); 158void vlan_gvrp_uninit_applicant(struct net_device *dev); 159int vlan_gvrp_init(void); 160void vlan_gvrp_uninit(void); 161#else 162static inline int vlan_gvrp_request_join(const struct net_device *dev) { return 0; } 163static inline void vlan_gvrp_request_leave(const struct net_device *dev) {} 164static inline int vlan_gvrp_init_applicant(struct net_device *dev) { return 0; } 165static inline void vlan_gvrp_uninit_applicant(struct net_device *dev) {} 166static inline int vlan_gvrp_init(void) { return 0; } 167static inline void vlan_gvrp_uninit(void) {} 168#endif 169 170#ifdef CONFIG_VLAN_8021Q_MVRP 171int vlan_mvrp_request_join(const struct net_device *dev); 172void vlan_mvrp_request_leave(const struct net_device *dev); 173int vlan_mvrp_init_applicant(struct net_device *dev); 174void vlan_mvrp_uninit_applicant(struct net_device *dev); 175int vlan_mvrp_init(void); 176void vlan_mvrp_uninit(void); 177#else 178static inline int vlan_mvrp_request_join(const struct net_device *dev) { return 0; } 179static inline void vlan_mvrp_request_leave(const struct net_device *dev) {} 180static inline int vlan_mvrp_init_applicant(struct net_device *dev) { return 0; } 181static inline void vlan_mvrp_uninit_applicant(struct net_device *dev) {} 182static inline int vlan_mvrp_init(void) { return 0; } 183static inline void vlan_mvrp_uninit(void) {} 184#endif 185 186extern const char vlan_fullname[]; 187extern const char vlan_version[]; 188int vlan_netlink_init(void); 189void vlan_netlink_fini(void); 190 191extern struct rtnl_link_ops vlan_link_ops; 192 193extern unsigned int vlan_net_id; 194 195struct proc_dir_entry; 196 197struct vlan_net { 198 /* /proc/net/vlan */ 199 struct proc_dir_entry *proc_vlan_dir; 200 /* /proc/net/vlan/config */ 201 struct proc_dir_entry *proc_vlan_conf; 202 /* Determines interface naming scheme. */ 203 unsigned short name_type; 204}; 205 206#endif /* !(__BEN_VLAN_802_1Q_INC__) */