1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* 3 * Copyright (c) 2014 Mahesh Bandewar <maheshb@google.com> 4 */ 5 #ifndef __IPVLAN_H 6 #define __IPVLAN_H 7 8 #include <linux/kernel.h> 9 #include <linux/types.h> 10 #include <linux/module.h> 11 #include <linux/init.h> 12 #include <linux/rculist.h> 13 #include <linux/notifier.h> 14 #include <linux/netdevice.h> 15 #include <linux/etherdevice.h> 16 #include <linux/if_arp.h> 17 #include <linux/if_link.h> 18 #include <linux/if_vlan.h> 19 #include <linux/ip.h> 20 #include <linux/inetdevice.h> 21 #include <linux/netfilter.h> 22 #include <net/ip.h> 23 #include <net/ip6_route.h> 24 #include <net/netns/generic.h> 25 #include <net/rtnetlink.h> 26 #include <net/route.h> 27 #include <net/addrconf.h> 28 #include <net/l3mdev.h> 29 30 #define IPVLAN_DRV "ipvlan" 31 #define IPV_DRV_VER "0.1" 32 33 #define IPVLAN_HASH_SIZE (1 << BITS_PER_BYTE) 34 #define IPVLAN_HASH_MASK (IPVLAN_HASH_SIZE - 1) 35 36 #define IPVLAN_MAC_FILTER_BITS 8 37 #define IPVLAN_MAC_FILTER_SIZE (1 << IPVLAN_MAC_FILTER_BITS) 38 #define IPVLAN_MAC_FILTER_MASK (IPVLAN_MAC_FILTER_SIZE - 1) 39 40 #define IPVLAN_QBACKLOG_LIMIT 1000 41 42 typedef enum { 43 IPVL_IPV6 = 0, 44 IPVL_ICMPV6, 45 IPVL_IPV4, 46 IPVL_ARP, 47 } ipvl_hdr_type; 48 49 struct ipvl_pcpu_stats { 50 u64_stats_t rx_pkts; 51 u64_stats_t rx_bytes; 52 u64_stats_t rx_mcast; 53 u64_stats_t tx_pkts; 54 u64_stats_t tx_bytes; 55 struct u64_stats_sync syncp; 56 u32 rx_errs; 57 u32 tx_drps; 58 }; 59 60 struct ipvl_port; 61 62 struct ipvl_dev { 63 struct net_device *dev; 64 struct list_head pnode; 65 struct ipvl_port *port; 66 struct net_device *phy_dev; 67 struct list_head addrs; 68 struct ipvl_pcpu_stats __percpu *pcpu_stats; 69 DECLARE_BITMAP(mac_filters, IPVLAN_MAC_FILTER_SIZE); 70 netdev_features_t sfeatures; 71 u32 msg_enable; 72 bool dying; 73 }; 74 75 struct ipvl_addr { 76 struct ipvl_dev *master; /* Back pointer to master */ 77 union { 78 struct in6_addr ip6; /* IPv6 address on logical interface */ 79 struct in_addr ip4; /* IPv4 address on logical interface */ 80 } ipu; 81 #define ip6addr ipu.ip6 82 #define ip4addr ipu.ip4 83 struct hlist_node hlnode; /* Hash-table linkage */ 84 struct list_head anode; /* logical-interface linkage */ 85 ipvl_hdr_type atype; 86 struct rcu_head rcu; 87 }; 88 89 struct ipvl_port { 90 struct net_device *dev; 91 possible_net_t pnet; 92 struct hlist_head hlhead[IPVLAN_HASH_SIZE]; 93 spinlock_t addrs_lock; /* guards hash-table and addrs */ 94 struct list_head ipvlans; 95 struct mutex pnodes_lock; 96 u16 mode; 97 u16 flags; 98 u16 dev_id_start; 99 struct work_struct wq; 100 struct sk_buff_head backlog; 101 refcount_t count; 102 struct ida ida; 103 netdevice_tracker dev_tracker; 104 }; 105 106 struct ipvl_skb_cb { 107 bool tx_pkt; 108 }; 109 #define IPVL_SKB_CB(_skb) ((struct ipvl_skb_cb *)&((_skb)->cb[0])) 110 111 static inline struct ipvl_port *ipvlan_port_get_rcu(const struct net_device *d) 112 { 113 return rcu_dereference(d->rx_handler_data); 114 } 115 116 static inline struct ipvl_port *ipvlan_port_get_rcu_bh(const struct net_device *d) 117 { 118 return rcu_dereference_bh(d->rx_handler_data); 119 } 120 121 static inline struct ipvl_port *ipvlan_port_get_rtnl(const struct net_device *d) 122 { 123 return rtnl_dereference(d->rx_handler_data); 124 } 125 126 static inline bool ipvlan_is_private(const struct ipvl_port *port) 127 { 128 return !!(port->flags & IPVLAN_F_PRIVATE); 129 } 130 131 static inline void ipvlan_mark_private(struct ipvl_port *port) 132 { 133 port->flags |= IPVLAN_F_PRIVATE; 134 } 135 136 static inline void ipvlan_clear_private(struct ipvl_port *port) 137 { 138 port->flags &= ~IPVLAN_F_PRIVATE; 139 } 140 141 static inline bool ipvlan_is_vepa(const struct ipvl_port *port) 142 { 143 return !!(port->flags & IPVLAN_F_VEPA); 144 } 145 146 static inline void ipvlan_mark_vepa(struct ipvl_port *port) 147 { 148 port->flags |= IPVLAN_F_VEPA; 149 } 150 151 static inline void ipvlan_clear_vepa(struct ipvl_port *port) 152 { 153 port->flags &= ~IPVLAN_F_VEPA; 154 } 155 156 void ipvlan_init_secret(void); 157 unsigned int ipvlan_mac_hash(const unsigned char *addr); 158 rx_handler_result_t ipvlan_handle_frame(struct sk_buff **pskb); 159 void ipvlan_process_multicast(struct work_struct *work); 160 int ipvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev); 161 void ipvlan_ht_addr_add(struct ipvl_dev *ipvlan, struct ipvl_addr *addr); 162 struct ipvl_addr *ipvlan_find_addr(const struct ipvl_dev *ipvlan, 163 const void *iaddr, bool is_v6); 164 bool ipvlan_addr_busy(struct ipvl_port *port, void *iaddr, bool is_v6); 165 void ipvlan_ht_addr_del(struct ipvl_addr *addr); 166 struct ipvl_addr *ipvlan_addr_lookup(struct ipvl_port *port, void *lyr3h, 167 int addr_type, bool use_dest); 168 void *ipvlan_get_L3_hdr(struct ipvl_port *port, struct sk_buff *skb, int *type); 169 void ipvlan_count_rx(const struct ipvl_dev *ipvlan, 170 unsigned int len, bool success, bool mcast); 171 int ipvlan_link_new(struct net_device *dev, struct rtnl_newlink_params *params, 172 struct netlink_ext_ack *extack); 173 void __ipvlan_link_delete(struct net *net, struct net_device *dev, 174 struct list_head *head); 175 void ipvlan_link_setup(struct net_device *dev); 176 int ipvlan_link_register(struct rtnl_link_ops *ops); 177 #ifdef CONFIG_IPVLAN_L3S 178 int ipvlan_l3s_register(struct ipvl_port *port); 179 void ipvlan_l3s_unregister(struct ipvl_port *port); 180 void ipvlan_migrate_l3s_hook(struct net *oldnet, struct net *newnet); 181 int ipvlan_l3s_init(void); 182 void ipvlan_l3s_cleanup(void); 183 #else 184 static inline int ipvlan_l3s_register(struct ipvl_port *port) 185 { 186 return -ENOTSUPP; 187 } 188 189 static inline void ipvlan_l3s_unregister(struct ipvl_port *port) 190 { 191 } 192 193 static inline void ipvlan_migrate_l3s_hook(struct net *oldnet, 194 struct net *newnet) 195 { 196 } 197 198 static inline int ipvlan_l3s_init(void) 199 { 200 return 0; 201 } 202 203 static inline void ipvlan_l3s_cleanup(void) 204 { 205 } 206 #endif /* CONFIG_IPVLAN_L3S */ 207 208 static inline bool netif_is_ipvlan_port(const struct net_device *dev) 209 { 210 return rcu_access_pointer(dev->rx_handler) == ipvlan_handle_frame; 211 } 212 213 #if IS_ENABLED(CONFIG_IPVTAP) 214 extern void (*__ipvtap_dellink_ptr)(struct net *net, struct net_device *dev, 215 struct list_head *head); 216 #endif 217 218 #endif /* __IPVLAN_H */ 219