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                     dev_id_start;
 100         struct work_struct      wq;
 101         struct sk_buff_head     backlog;
 102         int                     count;
 103         struct ida              ida;
 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 void ipvlan_init_secret(void);
 127 unsigned int ipvlan_mac_hash(const unsigned char *addr);
 128 rx_handler_result_t ipvlan_handle_frame(struct sk_buff **pskb);
 129 void ipvlan_process_multicast(struct work_struct *work);
 130 int ipvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev);
 131 void ipvlan_ht_addr_add(struct ipvl_dev *ipvlan, struct ipvl_addr *addr);
 132 struct ipvl_addr *ipvlan_find_addr(const struct ipvl_dev *ipvlan,
 133                                    const void *iaddr, bool is_v6);
 134 bool ipvlan_addr_busy(struct ipvl_port *port, void *iaddr, bool is_v6);
 135 void ipvlan_ht_addr_del(struct ipvl_addr *addr);
 136 struct sk_buff *ipvlan_l3_rcv(struct net_device *dev, struct sk_buff *skb,
 137                               u16 proto);
 138 unsigned int ipvlan_nf_input(void *priv, struct sk_buff *skb,
 139                              const struct nf_hook_state *state);
 140 void ipvlan_count_rx(const struct ipvl_dev *ipvlan,
 141                      unsigned int len, bool success, bool mcast);
 142 int ipvlan_link_new(struct net *src_net, struct net_device *dev,
 143                     struct nlattr *tb[], struct nlattr *data[],
 144                     struct netlink_ext_ack *extack);
 145 void ipvlan_link_delete(struct net_device *dev, struct list_head *head);
 146 void ipvlan_link_setup(struct net_device *dev);
 147 int ipvlan_link_register(struct rtnl_link_ops *ops);
 148 #endif /* __IPVLAN_H */