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_stats_t rx_pkts;
51 u64_stats_t rx_bytes;
52 u64_stats_t rx_mcast;
53 u64_stats_t tx_pkts;
54 u64_stats_t 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 netdevice_tracker dev_tracker;
102 };
103
104 struct ipvl_skb_cb {
105 bool tx_pkt;
106 };
107 #define IPVL_SKB_CB(_skb) ((struct ipvl_skb_cb *)&((_skb)->cb[0]))
108
ipvlan_port_get_rcu(const struct net_device * d)109 static inline struct ipvl_port *ipvlan_port_get_rcu(const struct net_device *d)
110 {
111 return rcu_dereference(d->rx_handler_data);
112 }
113
ipvlan_port_get_rcu_bh(const struct net_device * d)114 static inline struct ipvl_port *ipvlan_port_get_rcu_bh(const struct net_device *d)
115 {
116 return rcu_dereference_bh(d->rx_handler_data);
117 }
118
ipvlan_port_get_rtnl(const struct net_device * d)119 static inline struct ipvl_port *ipvlan_port_get_rtnl(const struct net_device *d)
120 {
121 return rtnl_dereference(d->rx_handler_data);
122 }
123
ipvlan_is_private(const struct ipvl_port * port)124 static inline bool ipvlan_is_private(const struct ipvl_port *port)
125 {
126 return !!(port->flags & IPVLAN_F_PRIVATE);
127 }
128
ipvlan_mark_private(struct ipvl_port * port)129 static inline void ipvlan_mark_private(struct ipvl_port *port)
130 {
131 port->flags |= IPVLAN_F_PRIVATE;
132 }
133
ipvlan_clear_private(struct ipvl_port * port)134 static inline void ipvlan_clear_private(struct ipvl_port *port)
135 {
136 port->flags &= ~IPVLAN_F_PRIVATE;
137 }
138
ipvlan_is_vepa(const struct ipvl_port * port)139 static inline bool ipvlan_is_vepa(const struct ipvl_port *port)
140 {
141 return !!(port->flags & IPVLAN_F_VEPA);
142 }
143
ipvlan_mark_vepa(struct ipvl_port * port)144 static inline void ipvlan_mark_vepa(struct ipvl_port *port)
145 {
146 port->flags |= IPVLAN_F_VEPA;
147 }
148
ipvlan_clear_vepa(struct ipvl_port * port)149 static inline void ipvlan_clear_vepa(struct ipvl_port *port)
150 {
151 port->flags &= ~IPVLAN_F_VEPA;
152 }
153
154 void ipvlan_init_secret(void);
155 unsigned int ipvlan_mac_hash(const unsigned char *addr);
156 rx_handler_result_t ipvlan_handle_frame(struct sk_buff **pskb);
157 void ipvlan_process_multicast(struct work_struct *work);
158 int ipvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev);
159 void ipvlan_ht_addr_add(struct ipvl_dev *ipvlan, struct ipvl_addr *addr);
160 struct ipvl_addr *ipvlan_find_addr(const struct ipvl_dev *ipvlan,
161 const void *iaddr, bool is_v6);
162 bool ipvlan_addr_busy(struct ipvl_port *port, void *iaddr, bool is_v6);
163 void ipvlan_ht_addr_del(struct ipvl_addr *addr);
164 struct ipvl_addr *ipvlan_addr_lookup(struct ipvl_port *port, void *lyr3h,
165 int addr_type, bool use_dest);
166 void *ipvlan_get_L3_hdr(struct ipvl_port *port, struct sk_buff *skb, int *type);
167 void ipvlan_count_rx(const struct ipvl_dev *ipvlan,
168 unsigned int len, bool success, bool mcast);
169 int ipvlan_link_new(struct net *src_net, struct net_device *dev,
170 struct nlattr *tb[], struct nlattr *data[],
171 struct netlink_ext_ack *extack);
172 void ipvlan_link_delete(struct net_device *dev, struct list_head *head);
173 void ipvlan_link_setup(struct net_device *dev);
174 int ipvlan_link_register(struct rtnl_link_ops *ops);
175 #ifdef CONFIG_IPVLAN_L3S
176 int ipvlan_l3s_register(struct ipvl_port *port);
177 void ipvlan_l3s_unregister(struct ipvl_port *port);
178 void ipvlan_migrate_l3s_hook(struct net *oldnet, struct net *newnet);
179 int ipvlan_l3s_init(void);
180 void ipvlan_l3s_cleanup(void);
181 #else
ipvlan_l3s_register(struct ipvl_port * port)182 static inline int ipvlan_l3s_register(struct ipvl_port *port)
183 {
184 return -ENOTSUPP;
185 }
186
ipvlan_l3s_unregister(struct ipvl_port * port)187 static inline void ipvlan_l3s_unregister(struct ipvl_port *port)
188 {
189 }
190
ipvlan_migrate_l3s_hook(struct net * oldnet,struct net * newnet)191 static inline void ipvlan_migrate_l3s_hook(struct net *oldnet,
192 struct net *newnet)
193 {
194 }
195
ipvlan_l3s_init(void)196 static inline int ipvlan_l3s_init(void)
197 {
198 return 0;
199 }
200
ipvlan_l3s_cleanup(void)201 static inline void ipvlan_l3s_cleanup(void)
202 {
203 }
204 #endif /* CONFIG_IPVLAN_L3S */
205
netif_is_ipvlan_port(const struct net_device * dev)206 static inline bool netif_is_ipvlan_port(const struct net_device *dev)
207 {
208 return rcu_access_pointer(dev->rx_handler) == ipvlan_handle_frame;
209 }
210
211 #endif /* __IPVLAN_H */
212