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 }; 78 79 struct ipvl_addr { 80 struct ipvl_dev *master; /* Back pointer to master */ 81 union { 82 struct in6_addr ip6; /* IPv6 address on logical interface */ 83 struct in_addr ip4; /* IPv4 address on logical interface */ 84 } ipu; 85 #define ip6addr ipu.ip6 86 #define ip4addr ipu.ip4 87 struct hlist_node hlnode; /* Hash-table linkage */ 88 struct list_head anode; /* logical-interface linkage */ 89 ipvl_hdr_type atype; 90 struct rcu_head rcu; 91 }; 92 93 struct ipvl_port { 94 struct net_device *dev; 95 possible_net_t pnet; 96 struct hlist_head hlhead[IPVLAN_HASH_SIZE]; 97 struct list_head ipvlans; 98 u16 mode; 99 u16 flags; 100 u16 dev_id_start; 101 struct work_struct wq; 102 struct sk_buff_head backlog; 103 int count; 104 struct ida ida; 105 }; 106 107 struct ipvl_skb_cb { 108 bool tx_pkt; 109 }; 110 #define IPVL_SKB_CB(_skb) ((struct ipvl_skb_cb *)&((_skb)->cb[0])) 111 112 static inline struct ipvl_port *ipvlan_port_get_rcu(const struct net_device *d) 113 { 114 return rcu_dereference(d->rx_handler_data); 115 } 116 117 static inline struct ipvl_port *ipvlan_port_get_rcu_bh(const struct net_device *d) 118 { 119 return rcu_dereference_bh(d->rx_handler_data); 120 } 121 122 static inline struct ipvl_port *ipvlan_port_get_rtnl(const struct net_device *d) 123 { 124 return rtnl_dereference(d->rx_handler_data); 125 } 126 127 static inline bool ipvlan_is_private(const struct ipvl_port *port) 128 { 129 return !!(port->flags & IPVLAN_F_PRIVATE); 130 } 131 132 static inline void ipvlan_mark_private(struct ipvl_port *port) 133 { 134 port->flags |= IPVLAN_F_PRIVATE; 135 } 136 137 static inline void ipvlan_clear_private(struct ipvl_port *port) 138 { 139 port->flags &= ~IPVLAN_F_PRIVATE; 140 } 141 142 static inline bool ipvlan_is_vepa(const struct ipvl_port *port) 143 { 144 return !!(port->flags & IPVLAN_F_VEPA); 145 } 146 147 static inline void ipvlan_mark_vepa(struct ipvl_port *port) 148 { 149 port->flags |= IPVLAN_F_VEPA; 150 } 151 152 static inline void ipvlan_clear_vepa(struct ipvl_port *port) 153 { 154 port->flags &= ~IPVLAN_F_VEPA; 155 } 156 157 void ipvlan_init_secret(void); 158 unsigned int ipvlan_mac_hash(const unsigned char *addr); 159 rx_handler_result_t ipvlan_handle_frame(struct sk_buff **pskb); 160 void ipvlan_process_multicast(struct work_struct *work); 161 int ipvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev); 162 void ipvlan_ht_addr_add(struct ipvl_dev *ipvlan, struct ipvl_addr *addr); 163 struct ipvl_addr *ipvlan_find_addr(const struct ipvl_dev *ipvlan, 164 const void *iaddr, bool is_v6); 165 bool ipvlan_addr_busy(struct ipvl_port *port, void *iaddr, bool is_v6); 166 void ipvlan_ht_addr_del(struct ipvl_addr *addr); 167 struct sk_buff *ipvlan_l3_rcv(struct net_device *dev, struct sk_buff *skb, 168 u16 proto); 169 unsigned int ipvlan_nf_input(void *priv, struct sk_buff *skb, 170 const struct nf_hook_state *state); 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 #endif /* __IPVLAN_H */ 180