drivers/net/ipvlan/ipvlan.h

   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                     rx_pkts;
  51         u64                     rx_bytes;
  52         u64                     rx_mcast;
  53         u64                     tx_pkts;
  54         u64                     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         spinlock_t              addrs_lock;
  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         struct list_head        ipvlans;
  94         u16                     mode;
  95         u16                     flags;
  96         u16                     dev_id_start;
  97         struct work_struct      wq;
  98         struct sk_buff_head     backlog;
  99         int                     count;
 100         struct ida              ida;
 101 };
 102
 103 struct ipvl_skb_cb {
 104         bool tx_pkt;
 105 };
 106 #define IPVL_SKB_CB(_skb) ((struct ipvl_skb_cb *)&((_skb)->cb[0]))
 107
 108 static inline struct ipvl_port *ipvlan_port_get_rcu(const struct net_device *d)
 109 {
 110         return rcu_dereference(d->rx_handler_data);
 111 }
 112
 113 static inline struct ipvl_port *ipvlan_port_get_rcu_bh(const struct net_device *d)
 114 {
 115         return rcu_dereference_bh(d->rx_handler_data);
 116 }
 117
 118 static inline struct ipvl_port *ipvlan_port_get_rtnl(const struct net_device *d)
 119 {
 120         return rtnl_dereference(d->rx_handler_data);
 121 }
 122
 123 static inline bool ipvlan_is_private(const struct ipvl_port *port)
 124 {
 125         return !!(port->flags & IPVLAN_F_PRIVATE);
 126 }
 127
 128 static inline void ipvlan_mark_private(struct ipvl_port *port)
 129 {
 130         port->flags |= IPVLAN_F_PRIVATE;
 131 }
 132
 133 static inline void ipvlan_clear_private(struct ipvl_port *port)
 134 {
 135         port->flags &= ~IPVLAN_F_PRIVATE;
 136 }
 137
 138 static inline bool ipvlan_is_vepa(const struct ipvl_port *port)
 139 {
 140         return !!(port->flags & IPVLAN_F_VEPA);
 141 }
 142
 143 static inline void ipvlan_mark_vepa(struct ipvl_port *port)
 144 {
 145         port->flags |= IPVLAN_F_VEPA;
 146 }
 147
 148 static inline void ipvlan_clear_vepa(struct ipvl_port *port)
 149 {
 150         port->flags &= ~IPVLAN_F_VEPA;
 151 }
 152
 153 void ipvlan_init_secret(void);
 154 unsigned int ipvlan_mac_hash(const unsigned char *addr);
 155 rx_handler_result_t ipvlan_handle_frame(struct sk_buff **pskb);
 156 void ipvlan_process_multicast(struct work_struct *work);
 157 int ipvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev);
 158 void ipvlan_ht_addr_add(struct ipvl_dev *ipvlan, struct ipvl_addr *addr);
 159 struct ipvl_addr *ipvlan_find_addr(const struct ipvl_dev *ipvlan,
 160                                    const void *iaddr, bool is_v6);
 161 bool ipvlan_addr_busy(struct ipvl_port *port, void *iaddr, bool is_v6);
 162 void ipvlan_ht_addr_del(struct ipvl_addr *addr);
 163 struct ipvl_addr *ipvlan_addr_lookup(struct ipvl_port *port, void *lyr3h,
 164                                      int addr_type, bool use_dest);
 165 void *ipvlan_get_L3_hdr(struct ipvl_port *port, struct sk_buff *skb, int *type);
 166 void ipvlan_count_rx(const struct ipvl_dev *ipvlan,
 167                      unsigned int len, bool success, bool mcast);
 168 int ipvlan_link_new(struct net *src_net, struct net_device *dev,
 169                     struct nlattr *tb[], struct nlattr *data[],
 170                     struct netlink_ext_ack *extack);
 171 void ipvlan_link_delete(struct net_device *dev, struct list_head *head);
 172 void ipvlan_link_setup(struct net_device *dev);
 173 int ipvlan_link_register(struct rtnl_link_ops *ops);
 174 #ifdef CONFIG_IPVLAN_L3S
 175 int ipvlan_l3s_register(struct ipvl_port *port);
 176 void ipvlan_l3s_unregister(struct ipvl_port *port);
 177 void ipvlan_migrate_l3s_hook(struct net *oldnet, struct net *newnet);
 178 int ipvlan_l3s_init(void);
 179 void ipvlan_l3s_cleanup(void);
 180 #else
 181 static inline int ipvlan_l3s_register(struct ipvl_port *port)
 182 {
 183         return -ENOTSUPP;
 184 }
 185
 186 static inline void ipvlan_l3s_unregister(struct ipvl_port *port)
 187 {
 188 }
 189
 190 static inline void ipvlan_migrate_l3s_hook(struct net *oldnet,
 191                                            struct net *newnet)
 192 {
 193 }
 194
 195 static inline int ipvlan_l3s_init(void)
 196 {
 197         return 0;
 198 }
 199
 200 static inline void ipvlan_l3s_cleanup(void)
 201 {
 202 }
 203 #endif /* CONFIG_IPVLAN_L3S */
 204
 205 static inline bool netif_is_ipvlan_port(const struct net_device *dev)
 206 {
 207         return rcu_access_pointer(dev->rx_handler) == ipvlan_handle_frame;
 208 }
 209
 210 #endif /* __IPVLAN_H */