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c5441932 PS |
1 | #ifndef __NET_IP_TUNNELS_H |
2 | #define __NET_IP_TUNNELS_H 1 | |
3 | ||
4 | #include <linux/if_tunnel.h> | |
5 | #include <linux/netdevice.h> | |
6 | #include <linux/skbuff.h> | |
7 | #include <linux/types.h> | |
8 | #include <linux/u64_stats_sync.h> | |
9 | #include <net/dsfield.h> | |
10 | #include <net/gro_cells.h> | |
11 | #include <net/inet_ecn.h> | |
12 | #include <net/ip.h> | |
56328486 | 13 | #include <net/netns/generic.h> |
c5441932 PS |
14 | #include <net/rtnetlink.h> |
15 | ||
16 | #if IS_ENABLED(CONFIG_IPV6) | |
17 | #include <net/ipv6.h> | |
18 | #include <net/ip6_fib.h> | |
19 | #include <net/ip6_route.h> | |
20 | #endif | |
21 | ||
22 | /* Keep error state on tunnel for 30 sec */ | |
23 | #define IPTUNNEL_ERR_TIMEO (30*HZ) | |
24 | ||
1d8fff90 TG |
25 | /* Used to memset ip_tunnel padding. */ |
26 | #define IP_TUNNEL_KEY_SIZE \ | |
27 | (offsetof(struct ip_tunnel_key, tp_dst) + \ | |
28 | FIELD_SIZEOF(struct ip_tunnel_key, tp_dst)) | |
29 | ||
30 | struct ip_tunnel_key { | |
31 | __be64 tun_id; | |
32 | __be32 ipv4_src; | |
33 | __be32 ipv4_dst; | |
34 | __be16 tun_flags; | |
35 | __u8 ipv4_tos; | |
36 | __u8 ipv4_ttl; | |
37 | __be16 tp_src; | |
38 | __be16 tp_dst; | |
39 | } __packed __aligned(4); /* Minimize padding. */ | |
40 | ||
41 | struct ip_tunnel_info { | |
42 | struct ip_tunnel_key key; | |
43 | const void *options; | |
44 | u8 options_len; | |
45 | }; | |
46 | ||
c5441932 PS |
47 | /* 6rd prefix/relay information */ |
48 | #ifdef CONFIG_IPV6_SIT_6RD | |
49 | struct ip_tunnel_6rd_parm { | |
50 | struct in6_addr prefix; | |
51 | __be32 relay_prefix; | |
52 | u16 prefixlen; | |
53 | u16 relay_prefixlen; | |
54 | }; | |
55 | #endif | |
56 | ||
56328486 TH |
57 | struct ip_tunnel_encap { |
58 | __u16 type; | |
59 | __u16 flags; | |
60 | __be16 sport; | |
61 | __be16 dport; | |
62 | }; | |
63 | ||
c5441932 PS |
64 | struct ip_tunnel_prl_entry { |
65 | struct ip_tunnel_prl_entry __rcu *next; | |
66 | __be32 addr; | |
67 | u16 flags; | |
68 | struct rcu_head rcu_head; | |
69 | }; | |
70 | ||
9a4aa9af TH |
71 | struct ip_tunnel_dst { |
72 | struct dst_entry __rcu *dst; | |
95cb5745 | 73 | __be32 saddr; |
9a4aa9af TH |
74 | }; |
75 | ||
c5441932 PS |
76 | struct ip_tunnel { |
77 | struct ip_tunnel __rcu *next; | |
78 | struct hlist_node hash_node; | |
79 | struct net_device *dev; | |
5e6700b3 | 80 | struct net *net; /* netns for packet i/o */ |
c5441932 PS |
81 | |
82 | int err_count; /* Number of arrived ICMP errors */ | |
83 | unsigned long err_time; /* Time when the last ICMP error | |
84 | * arrived */ | |
85 | ||
86 | /* These four fields used only by GRE */ | |
87 | __u32 i_seqno; /* The last seen seqno */ | |
88 | __u32 o_seqno; /* The last output seqno */ | |
56328486 | 89 | int tun_hlen; /* Precalculated header length */ |
c5441932 PS |
90 | int mlink; |
91 | ||
9a4aa9af | 92 | struct ip_tunnel_dst __percpu *dst_cache; |
7d442fab | 93 | |
c5441932 PS |
94 | struct ip_tunnel_parm parms; |
95 | ||
56328486 TH |
96 | int encap_hlen; /* Encap header length (FOU,GUE) */ |
97 | struct ip_tunnel_encap encap; | |
98 | ||
99 | int hlen; /* tun_hlen + encap_hlen */ | |
100 | ||
c5441932 PS |
101 | /* for SIT */ |
102 | #ifdef CONFIG_IPV6_SIT_6RD | |
103 | struct ip_tunnel_6rd_parm ip6rd; | |
104 | #endif | |
105 | struct ip_tunnel_prl_entry __rcu *prl; /* potential router list */ | |
106 | unsigned int prl_count; /* # of entries in PRL */ | |
107 | int ip_tnl_net_id; | |
108 | struct gro_cells gro_cells; | |
109 | }; | |
110 | ||
f5796684 JG |
111 | #define TUNNEL_CSUM __cpu_to_be16(0x01) |
112 | #define TUNNEL_ROUTING __cpu_to_be16(0x02) | |
113 | #define TUNNEL_KEY __cpu_to_be16(0x04) | |
114 | #define TUNNEL_SEQ __cpu_to_be16(0x08) | |
115 | #define TUNNEL_STRICT __cpu_to_be16(0x10) | |
116 | #define TUNNEL_REC __cpu_to_be16(0x20) | |
117 | #define TUNNEL_VERSION __cpu_to_be16(0x40) | |
118 | #define TUNNEL_NO_KEY __cpu_to_be16(0x80) | |
9a628224 | 119 | #define TUNNEL_DONT_FRAGMENT __cpu_to_be16(0x0100) |
f5796684 JG |
120 | #define TUNNEL_OAM __cpu_to_be16(0x0200) |
121 | #define TUNNEL_CRIT_OPT __cpu_to_be16(0x0400) | |
1dd144cf TG |
122 | #define TUNNEL_GENEVE_OPT __cpu_to_be16(0x0800) |
123 | #define TUNNEL_VXLAN_OPT __cpu_to_be16(0x1000) | |
124 | ||
125 | #define TUNNEL_OPTIONS_PRESENT (TUNNEL_GENEVE_OPT | TUNNEL_VXLAN_OPT) | |
c5441932 PS |
126 | |
127 | struct tnl_ptk_info { | |
128 | __be16 flags; | |
129 | __be16 proto; | |
130 | __be32 key; | |
131 | __be32 seq; | |
132 | }; | |
133 | ||
134 | #define PACKET_RCVD 0 | |
135 | #define PACKET_REJECT 1 | |
136 | ||
6261d983 | 137 | #define IP_TNL_HASH_BITS 7 |
c5441932 PS |
138 | #define IP_TNL_HASH_SIZE (1 << IP_TNL_HASH_BITS) |
139 | ||
140 | struct ip_tunnel_net { | |
c5441932 | 141 | struct net_device *fb_tunnel_dev; |
6261d983 | 142 | struct hlist_head tunnels[IP_TNL_HASH_SIZE]; |
c5441932 PS |
143 | }; |
144 | ||
a8c5f90f TH |
145 | struct ip_tunnel_encap_ops { |
146 | size_t (*encap_hlen)(struct ip_tunnel_encap *e); | |
147 | int (*build_header)(struct sk_buff *skb, struct ip_tunnel_encap *e, | |
148 | u8 *protocol, struct flowi4 *fl4); | |
149 | }; | |
150 | ||
151 | #define MAX_IPTUN_ENCAP_OPS 8 | |
152 | ||
153 | extern const struct ip_tunnel_encap_ops __rcu * | |
154 | iptun_encaps[MAX_IPTUN_ENCAP_OPS]; | |
155 | ||
156 | int ip_tunnel_encap_add_ops(const struct ip_tunnel_encap_ops *op, | |
157 | unsigned int num); | |
158 | int ip_tunnel_encap_del_ops(const struct ip_tunnel_encap_ops *op, | |
159 | unsigned int num); | |
160 | ||
1d8fff90 TG |
161 | static inline void __ip_tunnel_info_init(struct ip_tunnel_info *tun_info, |
162 | __be32 saddr, __be32 daddr, | |
163 | u8 tos, u8 ttl, | |
164 | __be16 tp_src, __be16 tp_dst, | |
165 | __be64 tun_id, __be16 tun_flags, | |
166 | const void *opts, u8 opts_len) | |
167 | { | |
168 | tun_info->key.tun_id = tun_id; | |
169 | tun_info->key.ipv4_src = saddr; | |
170 | tun_info->key.ipv4_dst = daddr; | |
171 | tun_info->key.ipv4_tos = tos; | |
172 | tun_info->key.ipv4_ttl = ttl; | |
173 | tun_info->key.tun_flags = tun_flags; | |
174 | ||
175 | /* For the tunnel types on the top of IPsec, the tp_src and tp_dst of | |
176 | * the upper tunnel are used. | |
177 | * E.g: GRE over IPSEC, the tp_src and tp_port are zero. | |
178 | */ | |
179 | tun_info->key.tp_src = tp_src; | |
180 | tun_info->key.tp_dst = tp_dst; | |
181 | ||
182 | /* Clear struct padding. */ | |
183 | if (sizeof(tun_info->key) != IP_TUNNEL_KEY_SIZE) | |
184 | memset((unsigned char *)&tun_info->key + IP_TUNNEL_KEY_SIZE, | |
185 | 0, sizeof(tun_info->key) - IP_TUNNEL_KEY_SIZE); | |
186 | ||
187 | tun_info->options = opts; | |
188 | tun_info->options_len = opts_len; | |
189 | } | |
190 | ||
191 | static inline void ip_tunnel_info_init(struct ip_tunnel_info *tun_info, | |
192 | const struct iphdr *iph, | |
193 | __be16 tp_src, __be16 tp_dst, | |
194 | __be64 tun_id, __be16 tun_flags, | |
195 | const void *opts, u8 opts_len) | |
196 | { | |
197 | __ip_tunnel_info_init(tun_info, iph->saddr, iph->daddr, | |
198 | iph->tos, iph->ttl, tp_src, tp_dst, | |
199 | tun_id, tun_flags, opts, opts_len); | |
200 | } | |
201 | ||
5243b6ac JG |
202 | #ifdef CONFIG_INET |
203 | ||
c5441932 PS |
204 | int ip_tunnel_init(struct net_device *dev); |
205 | void ip_tunnel_uninit(struct net_device *dev); | |
206 | void ip_tunnel_dellink(struct net_device *dev, struct list_head *head); | |
1728d4fa | 207 | struct net *ip_tunnel_get_link_net(const struct net_device *dev); |
1e99584b | 208 | int ip_tunnel_get_iflink(const struct net_device *dev); |
d3b6f614 ED |
209 | int ip_tunnel_init_net(struct net *net, int ip_tnl_net_id, |
210 | struct rtnl_link_ops *ops, char *devname); | |
c5441932 | 211 | |
6c742e71 | 212 | void ip_tunnel_delete_net(struct ip_tunnel_net *itn, struct rtnl_link_ops *ops); |
c5441932 PS |
213 | |
214 | void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev, | |
bf3d6a8f | 215 | const struct iphdr *tnl_params, const u8 protocol); |
c5441932 | 216 | int ip_tunnel_ioctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd); |
56328486 TH |
217 | int ip_tunnel_encap(struct sk_buff *skb, struct ip_tunnel *t, |
218 | u8 *protocol, struct flowi4 *fl4); | |
c5441932 PS |
219 | int ip_tunnel_change_mtu(struct net_device *dev, int new_mtu); |
220 | ||
221 | struct rtnl_link_stats64 *ip_tunnel_get_stats64(struct net_device *dev, | |
222 | struct rtnl_link_stats64 *tot); | |
223 | struct ip_tunnel *ip_tunnel_lookup(struct ip_tunnel_net *itn, | |
224 | int link, __be16 flags, | |
225 | __be32 remote, __be32 local, | |
226 | __be32 key); | |
227 | ||
228 | int ip_tunnel_rcv(struct ip_tunnel *tunnel, struct sk_buff *skb, | |
229 | const struct tnl_ptk_info *tpi, bool log_ecn_error); | |
230 | int ip_tunnel_changelink(struct net_device *dev, struct nlattr *tb[], | |
231 | struct ip_tunnel_parm *p); | |
232 | int ip_tunnel_newlink(struct net_device *dev, struct nlattr *tb[], | |
233 | struct ip_tunnel_parm *p); | |
234 | void ip_tunnel_setup(struct net_device *dev, int net_id); | |
cf71d2bc | 235 | void ip_tunnel_dst_reset_all(struct ip_tunnel *t); |
56328486 TH |
236 | int ip_tunnel_encap_setup(struct ip_tunnel *t, |
237 | struct ip_tunnel_encap *ipencap); | |
c5441932 PS |
238 | |
239 | /* Extract dsfield from inner protocol */ | |
240 | static inline u8 ip_tunnel_get_dsfield(const struct iphdr *iph, | |
241 | const struct sk_buff *skb) | |
242 | { | |
243 | if (skb->protocol == htons(ETH_P_IP)) | |
244 | return iph->tos; | |
245 | else if (skb->protocol == htons(ETH_P_IPV6)) | |
246 | return ipv6_get_dsfield((const struct ipv6hdr *)iph); | |
247 | else | |
248 | return 0; | |
249 | } | |
250 | ||
251 | /* Propogate ECN bits out */ | |
252 | static inline u8 ip_tunnel_ecn_encap(u8 tos, const struct iphdr *iph, | |
253 | const struct sk_buff *skb) | |
254 | { | |
255 | u8 inner = ip_tunnel_get_dsfield(iph, skb); | |
256 | ||
257 | return INET_ECN_encapsulate(tos, inner); | |
258 | } | |
259 | ||
3d7b46cd | 260 | int iptunnel_pull_header(struct sk_buff *skb, int hdr_len, __be16 inner_proto); |
aad88724 | 261 | int iptunnel_xmit(struct sock *sk, struct rtable *rt, struct sk_buff *skb, |
0e6fbc5b | 262 | __be32 src, __be32 dst, __u8 proto, |
963a88b3 | 263 | __u8 tos, __u8 ttl, __be16 df, bool xnet); |
0e6fbc5b | 264 | |
2d26f0a3 ED |
265 | struct sk_buff *iptunnel_handle_offloads(struct sk_buff *skb, bool gre_csum, |
266 | int gso_type_mask); | |
267 | ||
0e6fbc5b PS |
268 | static inline void iptunnel_xmit_stats(int err, |
269 | struct net_device_stats *err_stats, | |
8f84985f | 270 | struct pcpu_sw_netstats __percpu *stats) |
c5441932 | 271 | { |
0e6fbc5b | 272 | if (err > 0) { |
8f84985f | 273 | struct pcpu_sw_netstats *tstats = this_cpu_ptr(stats); |
c5441932 | 274 | |
c5441932 | 275 | u64_stats_update_begin(&tstats->syncp); |
0e6fbc5b | 276 | tstats->tx_bytes += err; |
c5441932 PS |
277 | tstats->tx_packets++; |
278 | u64_stats_update_end(&tstats->syncp); | |
0e6fbc5b PS |
279 | } else if (err < 0) { |
280 | err_stats->tx_errors++; | |
281 | err_stats->tx_aborted_errors++; | |
c5441932 | 282 | } else { |
0e6fbc5b | 283 | err_stats->tx_dropped++; |
c5441932 PS |
284 | } |
285 | } | |
5243b6ac JG |
286 | |
287 | #endif /* CONFIG_INET */ | |
288 | ||
c5441932 | 289 | #endif /* __NET_IP_TUNNELS_H */ |