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
 47typedef enum {
 48	IPVL_IPV6 = 0,
 49	IPVL_ICMPV6,
 50	IPVL_IPV4,
 51	IPVL_ARP,
 52} ipvl_hdr_type;
 53
 54struct 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
 65struct ipvl_port;
 66
 67struct 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	spinlock_t		addrs_lock;
 78};
 79
 80struct ipvl_addr {
 81	struct ipvl_dev		*master; /* Back pointer to master */
 82	union {
 83		struct in6_addr	ip6;	 /* IPv6 address on logical interface */
 84		struct in_addr	ip4;	 /* IPv4 address on logical interface */
 85	} ipu;
 86#define ip6addr	ipu.ip6
 87#define ip4addr ipu.ip4
 88	struct hlist_node	hlnode;  /* Hash-table linkage */
 89	struct list_head	anode;   /* logical-interface linkage */
 90	ipvl_hdr_type		atype;
 91	struct rcu_head		rcu;
 92};
 93
 94struct ipvl_port {
 95	struct net_device	*dev;
 96	possible_net_t		pnet;
 97	struct hlist_head	hlhead[IPVLAN_HASH_SIZE];
 98	struct list_head	ipvlans;
 99	u16			mode;
100	u16			flags;
101	u16			dev_id_start;
102	struct work_struct	wq;
103	struct sk_buff_head	backlog;
104	int			count;
105	struct ida		ida;
106};
107
108struct ipvl_skb_cb {
109	bool tx_pkt;
110};
111#define IPVL_SKB_CB(_skb) ((struct ipvl_skb_cb *)&((_skb)->cb[0]))
112
113static inline struct ipvl_port *ipvlan_port_get_rcu(const struct net_device *d)
114{
115	return rcu_dereference(d->rx_handler_data);
116}
117
118static inline struct ipvl_port *ipvlan_port_get_rcu_bh(const struct net_device *d)
119{
120	return rcu_dereference_bh(d->rx_handler_data);
121}
122
123static inline struct ipvl_port *ipvlan_port_get_rtnl(const struct net_device *d)
124{
125	return rtnl_dereference(d->rx_handler_data);
126}
127
128static inline bool ipvlan_is_private(const struct ipvl_port *port)
129{
130	return !!(port->flags & IPVLAN_F_PRIVATE);
131}
132
133static inline void ipvlan_mark_private(struct ipvl_port *port)
134{
135	port->flags |= IPVLAN_F_PRIVATE;
136}
137
138static inline void ipvlan_clear_private(struct ipvl_port *port)
139{
140	port->flags &= ~IPVLAN_F_PRIVATE;
141}
142
143static inline bool ipvlan_is_vepa(const struct ipvl_port *port)
144{
145	return !!(port->flags & IPVLAN_F_VEPA);
146}
147
148static inline void ipvlan_mark_vepa(struct ipvl_port *port)
149{
150	port->flags |= IPVLAN_F_VEPA;
151}
152
153static inline void ipvlan_clear_vepa(struct ipvl_port *port)
154{
155	port->flags &= ~IPVLAN_F_VEPA;
156}
157
158void ipvlan_init_secret(void);
159unsigned int ipvlan_mac_hash(const unsigned char *addr);
160rx_handler_result_t ipvlan_handle_frame(struct sk_buff **pskb);
161void ipvlan_process_multicast(struct work_struct *work);
162int ipvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev);
163void ipvlan_ht_addr_add(struct ipvl_dev *ipvlan, struct ipvl_addr *addr);
164struct ipvl_addr *ipvlan_find_addr(const struct ipvl_dev *ipvlan,
165				   const void *iaddr, bool is_v6);
166bool ipvlan_addr_busy(struct ipvl_port *port, void *iaddr, bool is_v6);
167void ipvlan_ht_addr_del(struct ipvl_addr *addr);
168struct sk_buff *ipvlan_l3_rcv(struct net_device *dev, struct sk_buff *skb,
169			      u16 proto);
170unsigned int ipvlan_nf_input(void *priv, struct sk_buff *skb,
171			     const struct nf_hook_state *state);
172void ipvlan_count_rx(const struct ipvl_dev *ipvlan,
173		     unsigned int len, bool success, bool mcast);
174int ipvlan_link_new(struct net *src_net, struct net_device *dev,
175		    struct nlattr *tb[], struct nlattr *data[],
176		    struct netlink_ext_ack *extack);
177void ipvlan_link_delete(struct net_device *dev, struct list_head *head);
178void ipvlan_link_setup(struct net_device *dev);
179int ipvlan_link_register(struct rtnl_link_ops *ops);
180
181static inline bool netif_is_ipvlan_port(const struct net_device *dev)
182{
183	return rcu_access_pointer(dev->rx_handler) == ipvlan_handle_frame;
184}
185
186#endif /* __IPVLAN_H */