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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> | |
7f9562a1 | 7 | #include <linux/socket.h> |
c5441932 PS |
8 | #include <linux/types.h> |
9 | #include <linux/u64_stats_sync.h> | |
10 | #include <net/dsfield.h> | |
11 | #include <net/gro_cells.h> | |
12 | #include <net/inet_ecn.h> | |
56328486 | 13 | #include <net/netns/generic.h> |
c5441932 | 14 | #include <net/rtnetlink.h> |
3093fbe7 | 15 | #include <net/lwtunnel.h> |
c5441932 PS |
16 | |
17 | #if IS_ENABLED(CONFIG_IPV6) | |
18 | #include <net/ipv6.h> | |
19 | #include <net/ip6_fib.h> | |
20 | #include <net/ip6_route.h> | |
21 | #endif | |
22 | ||
23 | /* Keep error state on tunnel for 30 sec */ | |
24 | #define IPTUNNEL_ERR_TIMEO (30*HZ) | |
25 | ||
1d8fff90 | 26 | /* Used to memset ip_tunnel padding. */ |
376534a3 | 27 | #define IP_TUNNEL_KEY_SIZE offsetofend(struct ip_tunnel_key, tp_dst) |
1d8fff90 | 28 | |
c1ea5d67 JB |
29 | /* Used to memset ipv4 address padding. */ |
30 | #define IP_TUNNEL_KEY_IPV4_PAD offsetofend(struct ip_tunnel_key, u.ipv4.dst) | |
31 | #define IP_TUNNEL_KEY_IPV4_PAD_LEN \ | |
32 | (FIELD_SIZEOF(struct ip_tunnel_key, u) - \ | |
33 | FIELD_SIZEOF(struct ip_tunnel_key, u.ipv4)) | |
34 | ||
1d8fff90 TG |
35 | struct ip_tunnel_key { |
36 | __be64 tun_id; | |
c1ea5d67 JB |
37 | union { |
38 | struct { | |
39 | __be32 src; | |
40 | __be32 dst; | |
41 | } ipv4; | |
42 | struct { | |
43 | struct in6_addr src; | |
44 | struct in6_addr dst; | |
45 | } ipv6; | |
46 | } u; | |
1d8fff90 | 47 | __be16 tun_flags; |
7c383fb2 JB |
48 | u8 tos; /* TOS for IPv4, TC for IPv6 */ |
49 | u8 ttl; /* TTL for IPv4, HL for IPv6 */ | |
1d8fff90 TG |
50 | __be16 tp_src; |
51 | __be16 tp_dst; | |
ac1cf399 | 52 | }; |
1d8fff90 | 53 | |
46fa062a JB |
54 | /* Flags for ip_tunnel_info mode. */ |
55 | #define IP_TUNNEL_INFO_TX 0x01 /* represents tx tunnel parameters */ | |
7f9562a1 | 56 | #define IP_TUNNEL_INFO_IPV6 0x02 /* key contains IPv6 addresses */ |
ee122c79 | 57 | |
1d8fff90 TG |
58 | struct ip_tunnel_info { |
59 | struct ip_tunnel_key key; | |
60 | const void *options; | |
61 | u8 options_len; | |
ee122c79 | 62 | u8 mode; |
1d8fff90 TG |
63 | }; |
64 | ||
c5441932 PS |
65 | /* 6rd prefix/relay information */ |
66 | #ifdef CONFIG_IPV6_SIT_6RD | |
67 | struct ip_tunnel_6rd_parm { | |
68 | struct in6_addr prefix; | |
69 | __be32 relay_prefix; | |
70 | u16 prefixlen; | |
71 | u16 relay_prefixlen; | |
72 | }; | |
73 | #endif | |
74 | ||
56328486 | 75 | struct ip_tunnel_encap { |
6b8847c5 JB |
76 | u16 type; |
77 | u16 flags; | |
56328486 TH |
78 | __be16 sport; |
79 | __be16 dport; | |
80 | }; | |
81 | ||
c5441932 PS |
82 | struct ip_tunnel_prl_entry { |
83 | struct ip_tunnel_prl_entry __rcu *next; | |
84 | __be32 addr; | |
85 | u16 flags; | |
86 | struct rcu_head rcu_head; | |
87 | }; | |
88 | ||
9a4aa9af TH |
89 | struct ip_tunnel_dst { |
90 | struct dst_entry __rcu *dst; | |
95cb5745 | 91 | __be32 saddr; |
9a4aa9af TH |
92 | }; |
93 | ||
2e15ea39 PS |
94 | struct metadata_dst; |
95 | ||
c5441932 PS |
96 | struct ip_tunnel { |
97 | struct ip_tunnel __rcu *next; | |
98 | struct hlist_node hash_node; | |
99 | struct net_device *dev; | |
5e6700b3 | 100 | struct net *net; /* netns for packet i/o */ |
c5441932 PS |
101 | |
102 | int err_count; /* Number of arrived ICMP errors */ | |
103 | unsigned long err_time; /* Time when the last ICMP error | |
104 | * arrived */ | |
105 | ||
106 | /* These four fields used only by GRE */ | |
6b8847c5 JB |
107 | u32 i_seqno; /* The last seen seqno */ |
108 | u32 o_seqno; /* The last output seqno */ | |
56328486 | 109 | int tun_hlen; /* Precalculated header length */ |
c5441932 PS |
110 | int mlink; |
111 | ||
9a4aa9af | 112 | struct ip_tunnel_dst __percpu *dst_cache; |
7d442fab | 113 | |
c5441932 PS |
114 | struct ip_tunnel_parm parms; |
115 | ||
56328486 TH |
116 | int encap_hlen; /* Encap header length (FOU,GUE) */ |
117 | struct ip_tunnel_encap encap; | |
118 | ||
119 | int hlen; /* tun_hlen + encap_hlen */ | |
120 | ||
c5441932 PS |
121 | /* for SIT */ |
122 | #ifdef CONFIG_IPV6_SIT_6RD | |
123 | struct ip_tunnel_6rd_parm ip6rd; | |
124 | #endif | |
125 | struct ip_tunnel_prl_entry __rcu *prl; /* potential router list */ | |
126 | unsigned int prl_count; /* # of entries in PRL */ | |
127 | int ip_tnl_net_id; | |
128 | struct gro_cells gro_cells; | |
2e15ea39 | 129 | bool collect_md; |
c5441932 PS |
130 | }; |
131 | ||
f5796684 JG |
132 | #define TUNNEL_CSUM __cpu_to_be16(0x01) |
133 | #define TUNNEL_ROUTING __cpu_to_be16(0x02) | |
134 | #define TUNNEL_KEY __cpu_to_be16(0x04) | |
135 | #define TUNNEL_SEQ __cpu_to_be16(0x08) | |
136 | #define TUNNEL_STRICT __cpu_to_be16(0x10) | |
137 | #define TUNNEL_REC __cpu_to_be16(0x20) | |
138 | #define TUNNEL_VERSION __cpu_to_be16(0x40) | |
139 | #define TUNNEL_NO_KEY __cpu_to_be16(0x80) | |
9a628224 | 140 | #define TUNNEL_DONT_FRAGMENT __cpu_to_be16(0x0100) |
f5796684 JG |
141 | #define TUNNEL_OAM __cpu_to_be16(0x0200) |
142 | #define TUNNEL_CRIT_OPT __cpu_to_be16(0x0400) | |
1dd144cf TG |
143 | #define TUNNEL_GENEVE_OPT __cpu_to_be16(0x0800) |
144 | #define TUNNEL_VXLAN_OPT __cpu_to_be16(0x1000) | |
145 | ||
146 | #define TUNNEL_OPTIONS_PRESENT (TUNNEL_GENEVE_OPT | TUNNEL_VXLAN_OPT) | |
c5441932 PS |
147 | |
148 | struct tnl_ptk_info { | |
149 | __be16 flags; | |
150 | __be16 proto; | |
151 | __be32 key; | |
152 | __be32 seq; | |
153 | }; | |
154 | ||
155 | #define PACKET_RCVD 0 | |
156 | #define PACKET_REJECT 1 | |
157 | ||
6261d983 | 158 | #define IP_TNL_HASH_BITS 7 |
c5441932 PS |
159 | #define IP_TNL_HASH_SIZE (1 << IP_TNL_HASH_BITS) |
160 | ||
161 | struct ip_tunnel_net { | |
c5441932 | 162 | struct net_device *fb_tunnel_dev; |
6261d983 | 163 | struct hlist_head tunnels[IP_TNL_HASH_SIZE]; |
2e15ea39 | 164 | struct ip_tunnel __rcu *collect_md_tun; |
c5441932 PS |
165 | }; |
166 | ||
a8c5f90f TH |
167 | struct ip_tunnel_encap_ops { |
168 | size_t (*encap_hlen)(struct ip_tunnel_encap *e); | |
169 | int (*build_header)(struct sk_buff *skb, struct ip_tunnel_encap *e, | |
170 | u8 *protocol, struct flowi4 *fl4); | |
171 | }; | |
172 | ||
173 | #define MAX_IPTUN_ENCAP_OPS 8 | |
174 | ||
175 | extern const struct ip_tunnel_encap_ops __rcu * | |
176 | iptun_encaps[MAX_IPTUN_ENCAP_OPS]; | |
177 | ||
178 | int ip_tunnel_encap_add_ops(const struct ip_tunnel_encap_ops *op, | |
179 | unsigned int num); | |
180 | int ip_tunnel_encap_del_ops(const struct ip_tunnel_encap_ops *op, | |
181 | unsigned int num); | |
182 | ||
1d8fff90 TG |
183 | static inline void __ip_tunnel_info_init(struct ip_tunnel_info *tun_info, |
184 | __be32 saddr, __be32 daddr, | |
185 | u8 tos, u8 ttl, | |
186 | __be16 tp_src, __be16 tp_dst, | |
187 | __be64 tun_id, __be16 tun_flags, | |
188 | const void *opts, u8 opts_len) | |
189 | { | |
190 | tun_info->key.tun_id = tun_id; | |
c1ea5d67 JB |
191 | tun_info->key.u.ipv4.src = saddr; |
192 | tun_info->key.u.ipv4.dst = daddr; | |
193 | memset((unsigned char *)&tun_info->key + IP_TUNNEL_KEY_IPV4_PAD, | |
194 | 0, IP_TUNNEL_KEY_IPV4_PAD_LEN); | |
7c383fb2 JB |
195 | tun_info->key.tos = tos; |
196 | tun_info->key.ttl = ttl; | |
1d8fff90 TG |
197 | tun_info->key.tun_flags = tun_flags; |
198 | ||
199 | /* For the tunnel types on the top of IPsec, the tp_src and tp_dst of | |
200 | * the upper tunnel are used. | |
201 | * E.g: GRE over IPSEC, the tp_src and tp_port are zero. | |
202 | */ | |
203 | tun_info->key.tp_src = tp_src; | |
204 | tun_info->key.tp_dst = tp_dst; | |
205 | ||
206 | /* Clear struct padding. */ | |
207 | if (sizeof(tun_info->key) != IP_TUNNEL_KEY_SIZE) | |
208 | memset((unsigned char *)&tun_info->key + IP_TUNNEL_KEY_SIZE, | |
209 | 0, sizeof(tun_info->key) - IP_TUNNEL_KEY_SIZE); | |
210 | ||
211 | tun_info->options = opts; | |
212 | tun_info->options_len = opts_len; | |
7f9562a1 JB |
213 | |
214 | tun_info->mode = 0; | |
1d8fff90 TG |
215 | } |
216 | ||
217 | static inline void ip_tunnel_info_init(struct ip_tunnel_info *tun_info, | |
218 | const struct iphdr *iph, | |
219 | __be16 tp_src, __be16 tp_dst, | |
220 | __be64 tun_id, __be16 tun_flags, | |
221 | const void *opts, u8 opts_len) | |
222 | { | |
223 | __ip_tunnel_info_init(tun_info, iph->saddr, iph->daddr, | |
224 | iph->tos, iph->ttl, tp_src, tp_dst, | |
225 | tun_id, tun_flags, opts, opts_len); | |
226 | } | |
227 | ||
7f9562a1 JB |
228 | static inline unsigned short ip_tunnel_info_af(const struct ip_tunnel_info |
229 | *tun_info) | |
230 | { | |
231 | return tun_info->mode & IP_TUNNEL_INFO_IPV6 ? AF_INET6 : AF_INET; | |
232 | } | |
233 | ||
5243b6ac JG |
234 | #ifdef CONFIG_INET |
235 | ||
c5441932 PS |
236 | int ip_tunnel_init(struct net_device *dev); |
237 | void ip_tunnel_uninit(struct net_device *dev); | |
238 | void ip_tunnel_dellink(struct net_device *dev, struct list_head *head); | |
1728d4fa | 239 | struct net *ip_tunnel_get_link_net(const struct net_device *dev); |
1e99584b | 240 | int ip_tunnel_get_iflink(const struct net_device *dev); |
d3b6f614 ED |
241 | int ip_tunnel_init_net(struct net *net, int ip_tnl_net_id, |
242 | struct rtnl_link_ops *ops, char *devname); | |
c5441932 | 243 | |
6c742e71 | 244 | void ip_tunnel_delete_net(struct ip_tunnel_net *itn, struct rtnl_link_ops *ops); |
c5441932 PS |
245 | |
246 | void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev, | |
bf3d6a8f | 247 | const struct iphdr *tnl_params, const u8 protocol); |
c5441932 | 248 | int ip_tunnel_ioctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd); |
56328486 TH |
249 | int ip_tunnel_encap(struct sk_buff *skb, struct ip_tunnel *t, |
250 | u8 *protocol, struct flowi4 *fl4); | |
c5441932 PS |
251 | int ip_tunnel_change_mtu(struct net_device *dev, int new_mtu); |
252 | ||
253 | struct rtnl_link_stats64 *ip_tunnel_get_stats64(struct net_device *dev, | |
254 | struct rtnl_link_stats64 *tot); | |
255 | struct ip_tunnel *ip_tunnel_lookup(struct ip_tunnel_net *itn, | |
256 | int link, __be16 flags, | |
257 | __be32 remote, __be32 local, | |
258 | __be32 key); | |
259 | ||
260 | int ip_tunnel_rcv(struct ip_tunnel *tunnel, struct sk_buff *skb, | |
2e15ea39 PS |
261 | const struct tnl_ptk_info *tpi, struct metadata_dst *tun_dst, |
262 | bool log_ecn_error); | |
c5441932 PS |
263 | int ip_tunnel_changelink(struct net_device *dev, struct nlattr *tb[], |
264 | struct ip_tunnel_parm *p); | |
265 | int ip_tunnel_newlink(struct net_device *dev, struct nlattr *tb[], | |
266 | struct ip_tunnel_parm *p); | |
267 | void ip_tunnel_setup(struct net_device *dev, int net_id); | |
cf71d2bc | 268 | void ip_tunnel_dst_reset_all(struct ip_tunnel *t); |
56328486 TH |
269 | int ip_tunnel_encap_setup(struct ip_tunnel *t, |
270 | struct ip_tunnel_encap *ipencap); | |
c5441932 PS |
271 | |
272 | /* Extract dsfield from inner protocol */ | |
273 | static inline u8 ip_tunnel_get_dsfield(const struct iphdr *iph, | |
274 | const struct sk_buff *skb) | |
275 | { | |
276 | if (skb->protocol == htons(ETH_P_IP)) | |
277 | return iph->tos; | |
278 | else if (skb->protocol == htons(ETH_P_IPV6)) | |
279 | return ipv6_get_dsfield((const struct ipv6hdr *)iph); | |
280 | else | |
281 | return 0; | |
282 | } | |
283 | ||
284 | /* Propogate ECN bits out */ | |
285 | static inline u8 ip_tunnel_ecn_encap(u8 tos, const struct iphdr *iph, | |
286 | const struct sk_buff *skb) | |
287 | { | |
288 | u8 inner = ip_tunnel_get_dsfield(iph, skb); | |
289 | ||
290 | return INET_ECN_encapsulate(tos, inner); | |
291 | } | |
292 | ||
3d7b46cd | 293 | int iptunnel_pull_header(struct sk_buff *skb, int hdr_len, __be16 inner_proto); |
aad88724 | 294 | int iptunnel_xmit(struct sock *sk, struct rtable *rt, struct sk_buff *skb, |
6b8847c5 JB |
295 | __be32 src, __be32 dst, u8 proto, |
296 | u8 tos, u8 ttl, __be16 df, bool xnet); | |
0e6fbc5b | 297 | |
2d26f0a3 ED |
298 | struct sk_buff *iptunnel_handle_offloads(struct sk_buff *skb, bool gre_csum, |
299 | int gso_type_mask); | |
300 | ||
0e6fbc5b PS |
301 | static inline void iptunnel_xmit_stats(int err, |
302 | struct net_device_stats *err_stats, | |
8f84985f | 303 | struct pcpu_sw_netstats __percpu *stats) |
c5441932 | 304 | { |
0e6fbc5b | 305 | if (err > 0) { |
8f84985f | 306 | struct pcpu_sw_netstats *tstats = this_cpu_ptr(stats); |
c5441932 | 307 | |
c5441932 | 308 | u64_stats_update_begin(&tstats->syncp); |
0e6fbc5b | 309 | tstats->tx_bytes += err; |
c5441932 PS |
310 | tstats->tx_packets++; |
311 | u64_stats_update_end(&tstats->syncp); | |
0e6fbc5b PS |
312 | } else if (err < 0) { |
313 | err_stats->tx_errors++; | |
314 | err_stats->tx_aborted_errors++; | |
c5441932 | 315 | } else { |
0e6fbc5b | 316 | err_stats->tx_dropped++; |
c5441932 PS |
317 | } |
318 | } | |
5243b6ac | 319 | |
ee122c79 TG |
320 | static inline void *ip_tunnel_info_opts(struct ip_tunnel_info *info, size_t n) |
321 | { | |
322 | return info + 1; | |
323 | } | |
324 | ||
3093fbe7 TG |
325 | static inline struct ip_tunnel_info *lwt_tun_info(struct lwtunnel_state *lwtstate) |
326 | { | |
327 | return (struct ip_tunnel_info *)lwtstate->data; | |
328 | } | |
329 | ||
e7030878 TG |
330 | extern struct static_key ip_tunnel_metadata_cnt; |
331 | ||
332 | /* Returns > 0 if metadata should be collected */ | |
333 | static inline int ip_tunnel_collect_metadata(void) | |
334 | { | |
335 | return static_key_false(&ip_tunnel_metadata_cnt); | |
336 | } | |
337 | ||
045a0fa0 TG |
338 | void __init ip_tunnel_core_init(void); |
339 | ||
e7030878 TG |
340 | void ip_tunnel_need_metadata(void); |
341 | void ip_tunnel_unneed_metadata(void); | |
342 | ||
05283187 TG |
343 | #else /* CONFIG_INET */ |
344 | ||
345 | static inline struct ip_tunnel_info *lwt_tun_info(struct lwtunnel_state *lwtstate) | |
346 | { | |
347 | return NULL; | |
348 | } | |
349 | ||
350 | static inline void ip_tunnel_need_metadata(void) | |
351 | { | |
352 | } | |
353 | ||
354 | static inline void ip_tunnel_unneed_metadata(void) | |
355 | { | |
356 | } | |
357 | ||
5243b6ac JG |
358 | #endif /* CONFIG_INET */ |
359 | ||
c5441932 | 360 | #endif /* __NET_IP_TUNNELS_H */ |