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/rtnetlink.h>
 30#include <net/route.h>
 31#include <net/addrconf.h>
 32#include <net/l3mdev.h>
 33
 34#define IPVLAN_DRV	"ipvlan"
 35#define IPV_DRV_VER	"0.1"
 36
 37#define IPVLAN_HASH_SIZE	(1 << BITS_PER_BYTE)
 38#define IPVLAN_HASH_MASK	(IPVLAN_HASH_SIZE - 1)
 39
 40#define IPVLAN_MAC_FILTER_BITS	8
 41#define IPVLAN_MAC_FILTER_SIZE	(1 << IPVLAN_MAC_FILTER_BITS)
 42#define IPVLAN_MAC_FILTER_MASK	(IPVLAN_MAC_FILTER_SIZE - 1)
 43
 44#define IPVLAN_QBACKLOG_LIMIT	1000
 45
 46typedef enum {
 47	IPVL_IPV6 = 0,
 48	IPVL_ICMPV6,
 49	IPVL_IPV4,
 50	IPVL_ARP,
 51} ipvl_hdr_type;
 52
 53struct ipvl_pcpu_stats {
 54	u64			rx_pkts;
 55	u64			rx_bytes;
 56	u64			rx_mcast;
 57	u64			tx_pkts;
 58	u64			tx_bytes;
 59	struct u64_stats_sync	syncp;
 60	u32			rx_errs;
 61	u32			tx_drps;
 62};
 63
 64struct ipvl_port;
 65
 66struct ipvl_dev {
 67	struct net_device	*dev;
 68	struct list_head	pnode;
 69	struct ipvl_port	*port;
 70	struct net_device	*phy_dev;
 71	struct list_head	addrs;
 72	struct ipvl_pcpu_stats	__percpu *pcpu_stats;
 73	DECLARE_BITMAP(mac_filters, IPVLAN_MAC_FILTER_SIZE);
 74	netdev_features_t	sfeatures;
 75	u32			msg_enable;
 76};
 77
 78struct ipvl_addr {
 79	struct ipvl_dev		*master; /* Back pointer to master */
 80	union {
 81		struct in6_addr	ip6;	 /* IPv6 address on logical interface */
 82		struct in_addr	ip4;	 /* IPv4 address on logical interface */
 83	} ipu;
 84#define ip6addr	ipu.ip6
 85#define ip4addr ipu.ip4
 86	struct hlist_node	hlnode;  /* Hash-table linkage */
 87	struct list_head	anode;   /* logical-interface linkage */
 88	ipvl_hdr_type		atype;
 89	struct rcu_head		rcu;
 90};
 91
 92struct ipvl_port {
 93	struct net_device	*dev;
 94	struct hlist_head	hlhead[IPVLAN_HASH_SIZE];
 95	struct list_head	ipvlans;
 96	u16			mode;
 97	struct work_struct	wq;
 98	struct sk_buff_head	backlog;
 99	int			count;
100};
101
102struct ipvl_skb_cb {
103	bool tx_pkt;
104};
105#define IPVL_SKB_CB(_skb) ((struct ipvl_skb_cb *)&((_skb)->cb[0]))
106
107static inline struct ipvl_port *ipvlan_port_get_rcu(const struct net_device *d)
108{
109	return rcu_dereference(d->rx_handler_data);
110}
111
112static inline struct ipvl_port *ipvlan_port_get_rcu_bh(const struct net_device *d)
113{
114	return rcu_dereference_bh(d->rx_handler_data);
115}
116
117static inline struct ipvl_port *ipvlan_port_get_rtnl(const struct net_device *d)
118{
119	return rtnl_dereference(d->rx_handler_data);
120}
121
122void ipvlan_init_secret(void);
123unsigned int ipvlan_mac_hash(const unsigned char *addr);
124rx_handler_result_t ipvlan_handle_frame(struct sk_buff **pskb);
125void ipvlan_process_multicast(struct work_struct *work);
126int ipvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev);
127void ipvlan_ht_addr_add(struct ipvl_dev *ipvlan, struct ipvl_addr *addr);
128struct ipvl_addr *ipvlan_find_addr(const struct ipvl_dev *ipvlan,
129				   const void *iaddr, bool is_v6);
130bool ipvlan_addr_busy(struct ipvl_port *port, void *iaddr, bool is_v6);
131void ipvlan_ht_addr_del(struct ipvl_addr *addr);
132struct sk_buff *ipvlan_l3_rcv(struct net_device *dev, struct sk_buff *skb,
133			      u16 proto);
134unsigned int ipvlan_nf_input(void *priv, struct sk_buff *skb,
135			     const struct nf_hook_state *state);
136#endif /* __IPVLAN_H */