1 /* 2 * Copyright (c) 2014 Mahesh Bandewar <maheshb@google.com> 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU General Public License as 6 * published by the Free Software Foundation; either version 2 of 7 * the License, or (at your option) any later version. 8 * 9 */ 10 #ifndef __IPVLAN_H 11 #define __IPVLAN_H 12 13 #include <linux/kernel.h> 14 #include <linux/types.h> 15 #include <linux/module.h> 16 #include <linux/init.h> 17 #include <linux/rculist.h> 18 #include <linux/notifier.h> 19 #include <linux/netdevice.h> 20 #include <linux/etherdevice.h> 21 #include <linux/if_arp.h> 22 #include <linux/if_link.h> 23 #include <linux/if_vlan.h> 24 #include <linux/ip.h> 25 #include <linux/inetdevice.h> 26 #include <linux/netfilter.h> 27 #include <net/ip.h> 28 #include <net/ip6_route.h> 29 #include <net/netns/generic.h> 30 #include <net/rtnetlink.h> 31 #include <net/route.h> 32 #include <net/addrconf.h> 33 #include <net/l3mdev.h> 34 35 #define IPVLAN_DRV "ipvlan" 36 #define IPV_DRV_VER "0.1" 37 38 #define IPVLAN_HASH_SIZE (1 << BITS_PER_BYTE) 39 #define IPVLAN_HASH_MASK (IPVLAN_HASH_SIZE - 1) 40 41 #define IPVLAN_MAC_FILTER_BITS 8 42 #define IPVLAN_MAC_FILTER_SIZE (1 << IPVLAN_MAC_FILTER_BITS) 43 #define IPVLAN_MAC_FILTER_MASK (IPVLAN_MAC_FILTER_SIZE - 1) 44 45 #define IPVLAN_QBACKLOG_LIMIT 1000 46 47 typedef enum { 48 IPVL_IPV6 = 0, 49 IPVL_ICMPV6, 50 IPVL_IPV4, 51 IPVL_ARP, 52 } ipvl_hdr_type; 53 54 struct ipvl_pcpu_stats { 55 u64 rx_pkts; 56 u64 rx_bytes; 57 u64 rx_mcast; 58 u64 tx_pkts; 59 u64 tx_bytes; 60 struct u64_stats_sync syncp; 61 u32 rx_errs; 62 u32 tx_drps; 63 }; 64 65 struct ipvl_port; 66 67 struct ipvl_dev { 68 struct net_device *dev; 69 struct list_head pnode; 70 struct ipvl_port *port; 71 struct net_device *phy_dev; 72 struct list_head addrs; 73 struct ipvl_pcpu_stats __percpu *pcpu_stats; 74 DECLARE_BITMAP(mac_filters, IPVLAN_MAC_FILTER_SIZE); 75 netdev_features_t sfeatures; 76 u32 msg_enable; 77 spinlock_t addrs_lock; 78 }; 79 80 struct ipvl_addr { 81 struct ipvl_dev *master; /* Back pointer to master */ 82 union { 83 struct in6_addr ip6; /* IPv6 address on logical interface */ 84 struct in_addr ip4; /* IPv4 address on logical interface */ 85 } ipu; 86 #define ip6addr ipu.ip6 87 #define ip4addr ipu.ip4 88 struct hlist_node hlnode; /* Hash-table linkage */ 89 struct list_head anode; /* logical-interface linkage */ 90 ipvl_hdr_type atype; 91 struct rcu_head rcu; 92 }; 93 94 struct ipvl_port { 95 struct net_device *dev; 96 possible_net_t pnet; 97 struct hlist_head hlhead[IPVLAN_HASH_SIZE]; 98 struct list_head ipvlans; 99 u16 mode; 100 u16 flags; 101 u16 dev_id_start; 102 struct work_struct wq; 103 struct sk_buff_head backlog; 104 int count; 105 struct ida ida; 106 }; 107 108 struct ipvl_skb_cb { 109 bool tx_pkt; 110 }; 111 #define IPVL_SKB_CB(_skb) ((struct ipvl_skb_cb *)&((_skb)->cb[0])) 112 113 static inline struct ipvl_port *ipvlan_port_get_rcu(const struct net_device *d) 114 { 115 return rcu_dereference(d->rx_handler_data); 116 } 117 118 static inline struct ipvl_port *ipvlan_port_get_rcu_bh(const struct net_device *d) 119 { 120 return rcu_dereference_bh(d->rx_handler_data); 121 } 122 123 static inline struct ipvl_port *ipvlan_port_get_rtnl(const struct net_device *d) 124 { 125 return rtnl_dereference(d->rx_handler_data); 126 } 127 128 static inline bool ipvlan_is_private(const struct ipvl_port *port) 129 { 130 return !!(port->flags & IPVLAN_F_PRIVATE); 131 } 132 133 static inline void ipvlan_mark_private(struct ipvl_port *port) 134 { 135 port->flags |= IPVLAN_F_PRIVATE; 136 } 137 138 static inline void ipvlan_clear_private(struct ipvl_port *port) 139 { 140 port->flags &= ~IPVLAN_F_PRIVATE; 141 } 142 143 static inline bool ipvlan_is_vepa(const struct ipvl_port *port) 144 { 145 return !!(port->flags & IPVLAN_F_VEPA); 146 } 147 148 static inline void ipvlan_mark_vepa(struct ipvl_port *port) 149 { 150 port->flags |= IPVLAN_F_VEPA; 151 } 152 153 static inline void ipvlan_clear_vepa(struct ipvl_port *port) 154 { 155 port->flags &= ~IPVLAN_F_VEPA; 156 } 157 158 void ipvlan_init_secret(void); 159 unsigned int ipvlan_mac_hash(const unsigned char *addr); 160 rx_handler_result_t ipvlan_handle_frame(struct sk_buff **pskb); 161 void ipvlan_process_multicast(struct work_struct *work); 162 int ipvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev); 163 void ipvlan_ht_addr_add(struct ipvl_dev *ipvlan, struct ipvl_addr *addr); 164 struct ipvl_addr *ipvlan_find_addr(const struct ipvl_dev *ipvlan, 165 const void *iaddr, bool is_v6); 166 bool ipvlan_addr_busy(struct ipvl_port *port, void *iaddr, bool is_v6); 167 void ipvlan_ht_addr_del(struct ipvl_addr *addr); 168 struct ipvl_addr *ipvlan_addr_lookup(struct ipvl_port *port, void *lyr3h, 169 int addr_type, bool use_dest); 170 void *ipvlan_get_L3_hdr(struct ipvl_port *port, struct sk_buff *skb, int *type); 171 void ipvlan_count_rx(const struct ipvl_dev *ipvlan, 172 unsigned int len, bool success, bool mcast); 173 int ipvlan_link_new(struct net *src_net, struct net_device *dev, 174 struct nlattr *tb[], struct nlattr *data[], 175 struct netlink_ext_ack *extack); 176 void ipvlan_link_delete(struct net_device *dev, struct list_head *head); 177 void ipvlan_link_setup(struct net_device *dev); 178 int ipvlan_link_register(struct rtnl_link_ops *ops); 179 #ifdef CONFIG_IPVLAN_L3S 180 int ipvlan_l3s_register(struct ipvl_port *port); 181 void ipvlan_l3s_unregister(struct ipvl_port *port); 182 void ipvlan_migrate_l3s_hook(struct net *oldnet, struct net *newnet); 183 int ipvlan_l3s_init(void); 184 void ipvlan_l3s_cleanup(void); 185 #else 186 static inline int ipvlan_l3s_register(struct ipvl_port *port) 187 { 188 return -ENOTSUPP; 189 } 190 191 static inline void ipvlan_l3s_unregister(struct ipvl_port *port) 192 { 193 } 194 195 static inline void ipvlan_migrate_l3s_hook(struct net *oldnet, 196 struct net *newnet) 197 { 198 } 199 200 static inline int ipvlan_l3s_init(void) 201 { 202 return 0; 203 } 204 205 static inline void ipvlan_l3s_cleanup(void) 206 { 207 } 208 #endif /* CONFIG_IPVLAN_L3S */ 209 210 static inline bool netif_is_ipvlan_port(const struct net_device *dev) 211 { 212 return rcu_access_pointer(dev->rx_handler) == ipvlan_handle_frame; 213 } 214 215 #endif /* __IPVLAN_H */ 216