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