drivers/net/ipvlan/ipvlan.h

   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 */