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 
ipvlan_port_get_rcu(const struct net_device * d)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 
ipvlan_port_get_rcu_bh(const struct net_device * d)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 
ipvlan_port_get_rtnl(const struct net_device * d)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 
ipvlan_is_private(const struct ipvl_port * port)123 static inline bool ipvlan_is_private(const struct ipvl_port *port)
124 {
125 	return !!(port->flags & IPVLAN_F_PRIVATE);
126 }
127 
ipvlan_mark_private(struct ipvl_port * port)128 static inline void ipvlan_mark_private(struct ipvl_port *port)
129 {
130 	port->flags |= IPVLAN_F_PRIVATE;
131 }
132 
ipvlan_clear_private(struct ipvl_port * port)133 static inline void ipvlan_clear_private(struct ipvl_port *port)
134 {
135 	port->flags &= ~IPVLAN_F_PRIVATE;
136 }
137 
ipvlan_is_vepa(const struct ipvl_port * port)138 static inline bool ipvlan_is_vepa(const struct ipvl_port *port)
139 {
140 	return !!(port->flags & IPVLAN_F_VEPA);
141 }
142 
ipvlan_mark_vepa(struct ipvl_port * port)143 static inline void ipvlan_mark_vepa(struct ipvl_port *port)
144 {
145 	port->flags |= IPVLAN_F_VEPA;
146 }
147 
ipvlan_clear_vepa(struct ipvl_port * port)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
ipvlan_l3s_register(struct ipvl_port * port)181 static inline int ipvlan_l3s_register(struct ipvl_port *port)
182 {
183 	return -ENOTSUPP;
184 }
185 
ipvlan_l3s_unregister(struct ipvl_port * port)186 static inline void ipvlan_l3s_unregister(struct ipvl_port *port)
187 {
188 }
189 
ipvlan_migrate_l3s_hook(struct net * oldnet,struct net * newnet)190 static inline void ipvlan_migrate_l3s_hook(struct net *oldnet,
191 					   struct net *newnet)
192 {
193 }
194 
ipvlan_l3s_init(void)195 static inline int ipvlan_l3s_init(void)
196 {
197 	return 0;
198 }
199 
ipvlan_l3s_cleanup(void)200 static inline void ipvlan_l3s_cleanup(void)
201 {
202 }
203 #endif /* CONFIG_IPVLAN_L3S */
204 
netif_is_ipvlan_port(const struct net_device * dev)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 */
211