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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> | |
fca5fdf6 DB |
10 | #include <linux/bitops.h> |
11 | ||
c5441932 PS |
12 | #include <net/dsfield.h> |
13 | #include <net/gro_cells.h> | |
14 | #include <net/inet_ecn.h> | |
56328486 | 15 | #include <net/netns/generic.h> |
c5441932 | 16 | #include <net/rtnetlink.h> |
3093fbe7 | 17 | #include <net/lwtunnel.h> |
e09acddf | 18 | #include <net/dst_cache.h> |
c5441932 PS |
19 | |
20 | #if IS_ENABLED(CONFIG_IPV6) | |
21 | #include <net/ipv6.h> | |
22 | #include <net/ip6_fib.h> | |
23 | #include <net/ip6_route.h> | |
24 | #endif | |
25 | ||
26 | /* Keep error state on tunnel for 30 sec */ | |
27 | #define IPTUNNEL_ERR_TIMEO (30*HZ) | |
28 | ||
1d8fff90 | 29 | /* Used to memset ip_tunnel padding. */ |
376534a3 | 30 | #define IP_TUNNEL_KEY_SIZE offsetofend(struct ip_tunnel_key, tp_dst) |
1d8fff90 | 31 | |
c1ea5d67 JB |
32 | /* Used to memset ipv4 address padding. */ |
33 | #define IP_TUNNEL_KEY_IPV4_PAD offsetofend(struct ip_tunnel_key, u.ipv4.dst) | |
34 | #define IP_TUNNEL_KEY_IPV4_PAD_LEN \ | |
35 | (FIELD_SIZEOF(struct ip_tunnel_key, u) - \ | |
36 | FIELD_SIZEOF(struct ip_tunnel_key, u.ipv4)) | |
37 | ||
1d8fff90 TG |
38 | struct ip_tunnel_key { |
39 | __be64 tun_id; | |
c1ea5d67 JB |
40 | union { |
41 | struct { | |
42 | __be32 src; | |
43 | __be32 dst; | |
44 | } ipv4; | |
45 | struct { | |
46 | struct in6_addr src; | |
47 | struct in6_addr dst; | |
48 | } ipv6; | |
49 | } u; | |
1d8fff90 | 50 | __be16 tun_flags; |
7c383fb2 JB |
51 | u8 tos; /* TOS for IPv4, TC for IPv6 */ |
52 | u8 ttl; /* TTL for IPv4, HL for IPv6 */ | |
13461144 | 53 | __be32 label; /* Flow Label for IPv6 */ |
1d8fff90 TG |
54 | __be16 tp_src; |
55 | __be16 tp_dst; | |
ac1cf399 | 56 | }; |
1d8fff90 | 57 | |
46fa062a JB |
58 | /* Flags for ip_tunnel_info mode. */ |
59 | #define IP_TUNNEL_INFO_TX 0x01 /* represents tx tunnel parameters */ | |
7f9562a1 | 60 | #define IP_TUNNEL_INFO_IPV6 0x02 /* key contains IPv6 addresses */ |
ee122c79 | 61 | |
fca5fdf6 DB |
62 | /* Maximum tunnel options length. */ |
63 | #define IP_TUNNEL_OPTS_MAX \ | |
64 | GENMASK((FIELD_SIZEOF(struct ip_tunnel_info, \ | |
65 | options_len) * BITS_PER_BYTE) - 1, 0) | |
66 | ||
1d8fff90 TG |
67 | struct ip_tunnel_info { |
68 | struct ip_tunnel_key key; | |
d71785ff PA |
69 | #ifdef CONFIG_DST_CACHE |
70 | struct dst_cache dst_cache; | |
71 | #endif | |
1d8fff90 | 72 | u8 options_len; |
ee122c79 | 73 | u8 mode; |
1d8fff90 TG |
74 | }; |
75 | ||
c5441932 PS |
76 | /* 6rd prefix/relay information */ |
77 | #ifdef CONFIG_IPV6_SIT_6RD | |
78 | struct ip_tunnel_6rd_parm { | |
79 | struct in6_addr prefix; | |
80 | __be32 relay_prefix; | |
81 | u16 prefixlen; | |
82 | u16 relay_prefixlen; | |
83 | }; | |
84 | #endif | |
85 | ||
56328486 | 86 | struct ip_tunnel_encap { |
6b8847c5 JB |
87 | u16 type; |
88 | u16 flags; | |
56328486 TH |
89 | __be16 sport; |
90 | __be16 dport; | |
91 | }; | |
92 | ||
c5441932 PS |
93 | struct ip_tunnel_prl_entry { |
94 | struct ip_tunnel_prl_entry __rcu *next; | |
95 | __be32 addr; | |
96 | u16 flags; | |
97 | struct rcu_head rcu_head; | |
98 | }; | |
99 | ||
2e15ea39 PS |
100 | struct metadata_dst; |
101 | ||
c5441932 PS |
102 | struct ip_tunnel { |
103 | struct ip_tunnel __rcu *next; | |
104 | struct hlist_node hash_node; | |
105 | struct net_device *dev; | |
5e6700b3 | 106 | struct net *net; /* netns for packet i/o */ |
c5441932 PS |
107 | |
108 | int err_count; /* Number of arrived ICMP errors */ | |
109 | unsigned long err_time; /* Time when the last ICMP error | |
110 | * arrived */ | |
111 | ||
112 | /* These four fields used only by GRE */ | |
6b8847c5 JB |
113 | u32 i_seqno; /* The last seen seqno */ |
114 | u32 o_seqno; /* The last output seqno */ | |
56328486 | 115 | int tun_hlen; /* Precalculated header length */ |
c5441932 PS |
116 | int mlink; |
117 | ||
e09acddf | 118 | struct dst_cache dst_cache; |
7d442fab | 119 | |
c5441932 PS |
120 | struct ip_tunnel_parm parms; |
121 | ||
56328486 TH |
122 | int encap_hlen; /* Encap header length (FOU,GUE) */ |
123 | struct ip_tunnel_encap encap; | |
124 | ||
125 | int hlen; /* tun_hlen + encap_hlen */ | |
126 | ||
c5441932 PS |
127 | /* for SIT */ |
128 | #ifdef CONFIG_IPV6_SIT_6RD | |
129 | struct ip_tunnel_6rd_parm ip6rd; | |
130 | #endif | |
131 | struct ip_tunnel_prl_entry __rcu *prl; /* potential router list */ | |
132 | unsigned int prl_count; /* # of entries in PRL */ | |
133 | int ip_tnl_net_id; | |
134 | struct gro_cells gro_cells; | |
2e15ea39 | 135 | bool collect_md; |
c5441932 PS |
136 | }; |
137 | ||
f5796684 JG |
138 | #define TUNNEL_CSUM __cpu_to_be16(0x01) |
139 | #define TUNNEL_ROUTING __cpu_to_be16(0x02) | |
140 | #define TUNNEL_KEY __cpu_to_be16(0x04) | |
141 | #define TUNNEL_SEQ __cpu_to_be16(0x08) | |
142 | #define TUNNEL_STRICT __cpu_to_be16(0x10) | |
143 | #define TUNNEL_REC __cpu_to_be16(0x20) | |
144 | #define TUNNEL_VERSION __cpu_to_be16(0x40) | |
145 | #define TUNNEL_NO_KEY __cpu_to_be16(0x80) | |
9a628224 | 146 | #define TUNNEL_DONT_FRAGMENT __cpu_to_be16(0x0100) |
f5796684 JG |
147 | #define TUNNEL_OAM __cpu_to_be16(0x0200) |
148 | #define TUNNEL_CRIT_OPT __cpu_to_be16(0x0400) | |
1dd144cf TG |
149 | #define TUNNEL_GENEVE_OPT __cpu_to_be16(0x0800) |
150 | #define TUNNEL_VXLAN_OPT __cpu_to_be16(0x1000) | |
db3c6139 | 151 | #define TUNNEL_NOCACHE __cpu_to_be16(0x2000) |
1dd144cf TG |
152 | |
153 | #define TUNNEL_OPTIONS_PRESENT (TUNNEL_GENEVE_OPT | TUNNEL_VXLAN_OPT) | |
c5441932 PS |
154 | |
155 | struct tnl_ptk_info { | |
156 | __be16 flags; | |
157 | __be16 proto; | |
158 | __be32 key; | |
159 | __be32 seq; | |
160 | }; | |
161 | ||
162 | #define PACKET_RCVD 0 | |
163 | #define PACKET_REJECT 1 | |
164 | ||
6261d983 | 165 | #define IP_TNL_HASH_BITS 7 |
c5441932 PS |
166 | #define IP_TNL_HASH_SIZE (1 << IP_TNL_HASH_BITS) |
167 | ||
168 | struct ip_tunnel_net { | |
c5441932 | 169 | struct net_device *fb_tunnel_dev; |
6261d983 | 170 | struct hlist_head tunnels[IP_TNL_HASH_SIZE]; |
2e15ea39 | 171 | struct ip_tunnel __rcu *collect_md_tun; |
c5441932 PS |
172 | }; |
173 | ||
a8c5f90f TH |
174 | struct ip_tunnel_encap_ops { |
175 | size_t (*encap_hlen)(struct ip_tunnel_encap *e); | |
176 | int (*build_header)(struct sk_buff *skb, struct ip_tunnel_encap *e, | |
177 | u8 *protocol, struct flowi4 *fl4); | |
178 | }; | |
179 | ||
180 | #define MAX_IPTUN_ENCAP_OPS 8 | |
181 | ||
182 | extern const struct ip_tunnel_encap_ops __rcu * | |
183 | iptun_encaps[MAX_IPTUN_ENCAP_OPS]; | |
184 | ||
185 | int ip_tunnel_encap_add_ops(const struct ip_tunnel_encap_ops *op, | |
186 | unsigned int num); | |
187 | int ip_tunnel_encap_del_ops(const struct ip_tunnel_encap_ops *op, | |
188 | unsigned int num); | |
189 | ||
4c222798 PS |
190 | static inline void ip_tunnel_key_init(struct ip_tunnel_key *key, |
191 | __be32 saddr, __be32 daddr, | |
13461144 | 192 | u8 tos, u8 ttl, __be32 label, |
4c222798 PS |
193 | __be16 tp_src, __be16 tp_dst, |
194 | __be64 tun_id, __be16 tun_flags) | |
1d8fff90 | 195 | { |
4c222798 PS |
196 | key->tun_id = tun_id; |
197 | key->u.ipv4.src = saddr; | |
198 | key->u.ipv4.dst = daddr; | |
199 | memset((unsigned char *)key + IP_TUNNEL_KEY_IPV4_PAD, | |
c1ea5d67 | 200 | 0, IP_TUNNEL_KEY_IPV4_PAD_LEN); |
4c222798 PS |
201 | key->tos = tos; |
202 | key->ttl = ttl; | |
13461144 | 203 | key->label = label; |
4c222798 | 204 | key->tun_flags = tun_flags; |
1d8fff90 TG |
205 | |
206 | /* For the tunnel types on the top of IPsec, the tp_src and tp_dst of | |
207 | * the upper tunnel are used. | |
208 | * E.g: GRE over IPSEC, the tp_src and tp_port are zero. | |
209 | */ | |
4c222798 PS |
210 | key->tp_src = tp_src; |
211 | key->tp_dst = tp_dst; | |
1d8fff90 TG |
212 | |
213 | /* Clear struct padding. */ | |
4c222798 PS |
214 | if (sizeof(*key) != IP_TUNNEL_KEY_SIZE) |
215 | memset((unsigned char *)key + IP_TUNNEL_KEY_SIZE, | |
216 | 0, sizeof(*key) - IP_TUNNEL_KEY_SIZE); | |
1d8fff90 TG |
217 | } |
218 | ||
db3c6139 DB |
219 | static inline bool |
220 | ip_tunnel_dst_cache_usable(const struct sk_buff *skb, | |
221 | const struct ip_tunnel_info *info) | |
222 | { | |
223 | if (skb->mark) | |
224 | return false; | |
225 | if (!info) | |
226 | return true; | |
227 | if (info->key.tun_flags & TUNNEL_NOCACHE) | |
228 | return false; | |
229 | ||
230 | return true; | |
231 | } | |
232 | ||
7f9562a1 JB |
233 | static inline unsigned short ip_tunnel_info_af(const struct ip_tunnel_info |
234 | *tun_info) | |
235 | { | |
236 | return tun_info->mode & IP_TUNNEL_INFO_IPV6 ? AF_INET6 : AF_INET; | |
237 | } | |
238 | ||
5243b6ac JG |
239 | #ifdef CONFIG_INET |
240 | ||
c5441932 PS |
241 | int ip_tunnel_init(struct net_device *dev); |
242 | void ip_tunnel_uninit(struct net_device *dev); | |
243 | void ip_tunnel_dellink(struct net_device *dev, struct list_head *head); | |
1728d4fa | 244 | struct net *ip_tunnel_get_link_net(const struct net_device *dev); |
1e99584b | 245 | int ip_tunnel_get_iflink(const struct net_device *dev); |
d3b6f614 ED |
246 | int ip_tunnel_init_net(struct net *net, int ip_tnl_net_id, |
247 | struct rtnl_link_ops *ops, char *devname); | |
c5441932 | 248 | |
6c742e71 | 249 | void ip_tunnel_delete_net(struct ip_tunnel_net *itn, struct rtnl_link_ops *ops); |
c5441932 PS |
250 | |
251 | void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev, | |
bf3d6a8f | 252 | const struct iphdr *tnl_params, const u8 protocol); |
c5441932 | 253 | int ip_tunnel_ioctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd); |
56328486 TH |
254 | int ip_tunnel_encap(struct sk_buff *skb, struct ip_tunnel *t, |
255 | u8 *protocol, struct flowi4 *fl4); | |
7e059158 | 256 | int __ip_tunnel_change_mtu(struct net_device *dev, int new_mtu, bool strict); |
c5441932 PS |
257 | int ip_tunnel_change_mtu(struct net_device *dev, int new_mtu); |
258 | ||
259 | struct rtnl_link_stats64 *ip_tunnel_get_stats64(struct net_device *dev, | |
260 | struct rtnl_link_stats64 *tot); | |
261 | struct ip_tunnel *ip_tunnel_lookup(struct ip_tunnel_net *itn, | |
262 | int link, __be16 flags, | |
263 | __be32 remote, __be32 local, | |
264 | __be32 key); | |
265 | ||
266 | int ip_tunnel_rcv(struct ip_tunnel *tunnel, struct sk_buff *skb, | |
2e15ea39 PS |
267 | const struct tnl_ptk_info *tpi, struct metadata_dst *tun_dst, |
268 | bool log_ecn_error); | |
c5441932 PS |
269 | int ip_tunnel_changelink(struct net_device *dev, struct nlattr *tb[], |
270 | struct ip_tunnel_parm *p); | |
271 | int ip_tunnel_newlink(struct net_device *dev, struct nlattr *tb[], | |
272 | struct ip_tunnel_parm *p); | |
273 | void ip_tunnel_setup(struct net_device *dev, int net_id); | |
56328486 TH |
274 | int ip_tunnel_encap_setup(struct ip_tunnel *t, |
275 | struct ip_tunnel_encap *ipencap); | |
c5441932 PS |
276 | |
277 | /* Extract dsfield from inner protocol */ | |
278 | static inline u8 ip_tunnel_get_dsfield(const struct iphdr *iph, | |
279 | const struct sk_buff *skb) | |
280 | { | |
281 | if (skb->protocol == htons(ETH_P_IP)) | |
282 | return iph->tos; | |
283 | else if (skb->protocol == htons(ETH_P_IPV6)) | |
284 | return ipv6_get_dsfield((const struct ipv6hdr *)iph); | |
285 | else | |
286 | return 0; | |
287 | } | |
288 | ||
289 | /* Propogate ECN bits out */ | |
290 | static inline u8 ip_tunnel_ecn_encap(u8 tos, const struct iphdr *iph, | |
291 | const struct sk_buff *skb) | |
292 | { | |
293 | u8 inner = ip_tunnel_get_dsfield(iph, skb); | |
294 | ||
295 | return INET_ECN_encapsulate(tos, inner); | |
296 | } | |
297 | ||
7f290c94 JB |
298 | int iptunnel_pull_header(struct sk_buff *skb, int hdr_len, __be16 inner_proto, |
299 | bool xnet); | |
039f5062 PS |
300 | void iptunnel_xmit(struct sock *sk, struct rtable *rt, struct sk_buff *skb, |
301 | __be32 src, __be32 dst, u8 proto, | |
302 | u8 tos, u8 ttl, __be16 df, bool xnet); | |
63d008a4 JB |
303 | struct metadata_dst *iptunnel_metadata_reply(struct metadata_dst *md, |
304 | gfp_t flags); | |
0e6fbc5b | 305 | |
6fa79666 | 306 | struct sk_buff *iptunnel_handle_offloads(struct sk_buff *skb, int gso_type_mask); |
2d26f0a3 | 307 | |
a09a4c8d JG |
308 | static inline int iptunnel_pull_offloads(struct sk_buff *skb) |
309 | { | |
310 | if (skb_is_gso(skb)) { | |
311 | int err; | |
312 | ||
313 | err = skb_unclone(skb, GFP_ATOMIC); | |
314 | if (unlikely(err)) | |
315 | return err; | |
316 | skb_shinfo(skb)->gso_type &= ~(NETIF_F_GSO_ENCAP_ALL >> | |
317 | NETIF_F_GSO_SHIFT); | |
318 | } | |
319 | ||
320 | skb->encapsulation = 0; | |
321 | return 0; | |
322 | } | |
323 | ||
039f5062 | 324 | static inline void iptunnel_xmit_stats(struct net_device *dev, int pkt_len) |
c5441932 | 325 | { |
039f5062 PS |
326 | if (pkt_len > 0) { |
327 | struct pcpu_sw_netstats *tstats = get_cpu_ptr(dev->tstats); | |
c5441932 | 328 | |
c5441932 | 329 | u64_stats_update_begin(&tstats->syncp); |
039f5062 | 330 | tstats->tx_bytes += pkt_len; |
c5441932 PS |
331 | tstats->tx_packets++; |
332 | u64_stats_update_end(&tstats->syncp); | |
b4fe85f9 | 333 | put_cpu_ptr(tstats); |
c5441932 | 334 | } else { |
039f5062 PS |
335 | struct net_device_stats *err_stats = &dev->stats; |
336 | ||
337 | if (pkt_len < 0) { | |
338 | err_stats->tx_errors++; | |
339 | err_stats->tx_aborted_errors++; | |
340 | } else { | |
341 | err_stats->tx_dropped++; | |
342 | } | |
c5441932 PS |
343 | } |
344 | } | |
5243b6ac | 345 | |
4c222798 | 346 | static inline void *ip_tunnel_info_opts(struct ip_tunnel_info *info) |
ee122c79 TG |
347 | { |
348 | return info + 1; | |
349 | } | |
350 | ||
4c222798 PS |
351 | static inline void ip_tunnel_info_opts_get(void *to, |
352 | const struct ip_tunnel_info *info) | |
353 | { | |
354 | memcpy(to, info + 1, info->options_len); | |
355 | } | |
356 | ||
357 | static inline void ip_tunnel_info_opts_set(struct ip_tunnel_info *info, | |
358 | const void *from, int len) | |
359 | { | |
360 | memcpy(ip_tunnel_info_opts(info), from, len); | |
361 | info->options_len = len; | |
362 | } | |
363 | ||
3093fbe7 TG |
364 | static inline struct ip_tunnel_info *lwt_tun_info(struct lwtunnel_state *lwtstate) |
365 | { | |
366 | return (struct ip_tunnel_info *)lwtstate->data; | |
367 | } | |
368 | ||
e7030878 TG |
369 | extern struct static_key ip_tunnel_metadata_cnt; |
370 | ||
371 | /* Returns > 0 if metadata should be collected */ | |
372 | static inline int ip_tunnel_collect_metadata(void) | |
373 | { | |
374 | return static_key_false(&ip_tunnel_metadata_cnt); | |
375 | } | |
376 | ||
045a0fa0 TG |
377 | void __init ip_tunnel_core_init(void); |
378 | ||
e7030878 TG |
379 | void ip_tunnel_need_metadata(void); |
380 | void ip_tunnel_unneed_metadata(void); | |
381 | ||
05283187 TG |
382 | #else /* CONFIG_INET */ |
383 | ||
384 | static inline struct ip_tunnel_info *lwt_tun_info(struct lwtunnel_state *lwtstate) | |
385 | { | |
386 | return NULL; | |
387 | } | |
388 | ||
389 | static inline void ip_tunnel_need_metadata(void) | |
390 | { | |
391 | } | |
392 | ||
393 | static inline void ip_tunnel_unneed_metadata(void) | |
394 | { | |
395 | } | |
396 | ||
e28e87ed DB |
397 | static inline void ip_tunnel_info_opts_get(void *to, |
398 | const struct ip_tunnel_info *info) | |
399 | { | |
400 | } | |
401 | ||
402 | static inline void ip_tunnel_info_opts_set(struct ip_tunnel_info *info, | |
403 | const void *from, int len) | |
404 | { | |
405 | info->options_len = 0; | |
406 | } | |
407 | ||
5243b6ac JG |
408 | #endif /* CONFIG_INET */ |
409 | ||
c5441932 | 410 | #endif /* __NET_IP_TUNNELS_H */ |