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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> | |
56328486 | 12 | #include <net/netns/generic.h> |
c5441932 | 13 | #include <net/rtnetlink.h> |
3093fbe7 | 14 | #include <net/lwtunnel.h> |
c5441932 PS |
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 | 25 | /* Used to memset ip_tunnel padding. */ |
376534a3 | 26 | #define IP_TUNNEL_KEY_SIZE offsetofend(struct ip_tunnel_key, tp_dst) |
1d8fff90 | 27 | |
c1ea5d67 JB |
28 | /* Used to memset ipv4 address padding. */ |
29 | #define IP_TUNNEL_KEY_IPV4_PAD offsetofend(struct ip_tunnel_key, u.ipv4.dst) | |
30 | #define IP_TUNNEL_KEY_IPV4_PAD_LEN \ | |
31 | (FIELD_SIZEOF(struct ip_tunnel_key, u) - \ | |
32 | FIELD_SIZEOF(struct ip_tunnel_key, u.ipv4)) | |
33 | ||
1d8fff90 TG |
34 | struct ip_tunnel_key { |
35 | __be64 tun_id; | |
c1ea5d67 JB |
36 | union { |
37 | struct { | |
38 | __be32 src; | |
39 | __be32 dst; | |
40 | } ipv4; | |
41 | struct { | |
42 | struct in6_addr src; | |
43 | struct in6_addr dst; | |
44 | } ipv6; | |
45 | } u; | |
1d8fff90 | 46 | __be16 tun_flags; |
7c383fb2 JB |
47 | u8 tos; /* TOS for IPv4, TC for IPv6 */ |
48 | u8 ttl; /* TTL for IPv4, HL for IPv6 */ | |
1d8fff90 TG |
49 | __be16 tp_src; |
50 | __be16 tp_dst; | |
ac1cf399 | 51 | }; |
1d8fff90 | 52 | |
46fa062a JB |
53 | /* Flags for ip_tunnel_info mode. */ |
54 | #define IP_TUNNEL_INFO_TX 0x01 /* represents tx tunnel parameters */ | |
ee122c79 | 55 | |
1d8fff90 TG |
56 | struct ip_tunnel_info { |
57 | struct ip_tunnel_key key; | |
58 | const void *options; | |
59 | u8 options_len; | |
ee122c79 | 60 | u8 mode; |
1d8fff90 TG |
61 | }; |
62 | ||
c5441932 PS |
63 | /* 6rd prefix/relay information */ |
64 | #ifdef CONFIG_IPV6_SIT_6RD | |
65 | struct ip_tunnel_6rd_parm { | |
66 | struct in6_addr prefix; | |
67 | __be32 relay_prefix; | |
68 | u16 prefixlen; | |
69 | u16 relay_prefixlen; | |
70 | }; | |
71 | #endif | |
72 | ||
56328486 | 73 | struct ip_tunnel_encap { |
6b8847c5 JB |
74 | u16 type; |
75 | u16 flags; | |
56328486 TH |
76 | __be16 sport; |
77 | __be16 dport; | |
78 | }; | |
79 | ||
c5441932 PS |
80 | struct ip_tunnel_prl_entry { |
81 | struct ip_tunnel_prl_entry __rcu *next; | |
82 | __be32 addr; | |
83 | u16 flags; | |
84 | struct rcu_head rcu_head; | |
85 | }; | |
86 | ||
9a4aa9af TH |
87 | struct ip_tunnel_dst { |
88 | struct dst_entry __rcu *dst; | |
95cb5745 | 89 | __be32 saddr; |
9a4aa9af TH |
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 | ||
9a4aa9af | 110 | struct ip_tunnel_dst __percpu *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) | |
143 | ||
144 | #define TUNNEL_OPTIONS_PRESENT (TUNNEL_GENEVE_OPT | TUNNEL_VXLAN_OPT) | |
c5441932 PS |
145 | |
146 | struct tnl_ptk_info { | |
147 | __be16 flags; | |
148 | __be16 proto; | |
149 | __be32 key; | |
150 | __be32 seq; | |
151 | }; | |
152 | ||
153 | #define PACKET_RCVD 0 | |
154 | #define PACKET_REJECT 1 | |
155 | ||
6261d983 | 156 | #define IP_TNL_HASH_BITS 7 |
c5441932 PS |
157 | #define IP_TNL_HASH_SIZE (1 << IP_TNL_HASH_BITS) |
158 | ||
159 | struct ip_tunnel_net { | |
c5441932 | 160 | struct net_device *fb_tunnel_dev; |
6261d983 | 161 | struct hlist_head tunnels[IP_TNL_HASH_SIZE]; |
2e15ea39 | 162 | struct ip_tunnel __rcu *collect_md_tun; |
c5441932 PS |
163 | }; |
164 | ||
a8c5f90f TH |
165 | struct ip_tunnel_encap_ops { |
166 | size_t (*encap_hlen)(struct ip_tunnel_encap *e); | |
167 | int (*build_header)(struct sk_buff *skb, struct ip_tunnel_encap *e, | |
168 | u8 *protocol, struct flowi4 *fl4); | |
169 | }; | |
170 | ||
171 | #define MAX_IPTUN_ENCAP_OPS 8 | |
172 | ||
173 | extern const struct ip_tunnel_encap_ops __rcu * | |
174 | iptun_encaps[MAX_IPTUN_ENCAP_OPS]; | |
175 | ||
176 | int ip_tunnel_encap_add_ops(const struct ip_tunnel_encap_ops *op, | |
177 | unsigned int num); | |
178 | int ip_tunnel_encap_del_ops(const struct ip_tunnel_encap_ops *op, | |
179 | unsigned int num); | |
180 | ||
1d8fff90 TG |
181 | static inline void __ip_tunnel_info_init(struct ip_tunnel_info *tun_info, |
182 | __be32 saddr, __be32 daddr, | |
183 | u8 tos, u8 ttl, | |
184 | __be16 tp_src, __be16 tp_dst, | |
185 | __be64 tun_id, __be16 tun_flags, | |
186 | const void *opts, u8 opts_len) | |
187 | { | |
188 | tun_info->key.tun_id = tun_id; | |
c1ea5d67 JB |
189 | tun_info->key.u.ipv4.src = saddr; |
190 | tun_info->key.u.ipv4.dst = daddr; | |
191 | memset((unsigned char *)&tun_info->key + IP_TUNNEL_KEY_IPV4_PAD, | |
192 | 0, IP_TUNNEL_KEY_IPV4_PAD_LEN); | |
7c383fb2 JB |
193 | tun_info->key.tos = tos; |
194 | tun_info->key.ttl = ttl; | |
1d8fff90 TG |
195 | tun_info->key.tun_flags = tun_flags; |
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 | */ | |
201 | tun_info->key.tp_src = tp_src; | |
202 | tun_info->key.tp_dst = tp_dst; | |
203 | ||
204 | /* Clear struct padding. */ | |
205 | if (sizeof(tun_info->key) != IP_TUNNEL_KEY_SIZE) | |
206 | memset((unsigned char *)&tun_info->key + IP_TUNNEL_KEY_SIZE, | |
207 | 0, sizeof(tun_info->key) - IP_TUNNEL_KEY_SIZE); | |
208 | ||
209 | tun_info->options = opts; | |
210 | tun_info->options_len = opts_len; | |
211 | } | |
212 | ||
213 | static inline void ip_tunnel_info_init(struct ip_tunnel_info *tun_info, | |
214 | const struct iphdr *iph, | |
215 | __be16 tp_src, __be16 tp_dst, | |
216 | __be64 tun_id, __be16 tun_flags, | |
217 | const void *opts, u8 opts_len) | |
218 | { | |
219 | __ip_tunnel_info_init(tun_info, iph->saddr, iph->daddr, | |
220 | iph->tos, iph->ttl, tp_src, tp_dst, | |
221 | tun_id, tun_flags, opts, opts_len); | |
222 | } | |
223 | ||
5243b6ac JG |
224 | #ifdef CONFIG_INET |
225 | ||
c5441932 PS |
226 | int ip_tunnel_init(struct net_device *dev); |
227 | void ip_tunnel_uninit(struct net_device *dev); | |
228 | void ip_tunnel_dellink(struct net_device *dev, struct list_head *head); | |
1728d4fa | 229 | struct net *ip_tunnel_get_link_net(const struct net_device *dev); |
1e99584b | 230 | int ip_tunnel_get_iflink(const struct net_device *dev); |
d3b6f614 ED |
231 | int ip_tunnel_init_net(struct net *net, int ip_tnl_net_id, |
232 | struct rtnl_link_ops *ops, char *devname); | |
c5441932 | 233 | |
6c742e71 | 234 | void ip_tunnel_delete_net(struct ip_tunnel_net *itn, struct rtnl_link_ops *ops); |
c5441932 PS |
235 | |
236 | void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev, | |
bf3d6a8f | 237 | const struct iphdr *tnl_params, const u8 protocol); |
c5441932 | 238 | int ip_tunnel_ioctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd); |
56328486 TH |
239 | int ip_tunnel_encap(struct sk_buff *skb, struct ip_tunnel *t, |
240 | u8 *protocol, struct flowi4 *fl4); | |
c5441932 PS |
241 | int ip_tunnel_change_mtu(struct net_device *dev, int new_mtu); |
242 | ||
243 | struct rtnl_link_stats64 *ip_tunnel_get_stats64(struct net_device *dev, | |
244 | struct rtnl_link_stats64 *tot); | |
245 | struct ip_tunnel *ip_tunnel_lookup(struct ip_tunnel_net *itn, | |
246 | int link, __be16 flags, | |
247 | __be32 remote, __be32 local, | |
248 | __be32 key); | |
249 | ||
250 | int ip_tunnel_rcv(struct ip_tunnel *tunnel, struct sk_buff *skb, | |
2e15ea39 PS |
251 | const struct tnl_ptk_info *tpi, struct metadata_dst *tun_dst, |
252 | bool log_ecn_error); | |
c5441932 PS |
253 | int ip_tunnel_changelink(struct net_device *dev, struct nlattr *tb[], |
254 | struct ip_tunnel_parm *p); | |
255 | int ip_tunnel_newlink(struct net_device *dev, struct nlattr *tb[], | |
256 | struct ip_tunnel_parm *p); | |
257 | void ip_tunnel_setup(struct net_device *dev, int net_id); | |
cf71d2bc | 258 | void ip_tunnel_dst_reset_all(struct ip_tunnel *t); |
56328486 TH |
259 | int ip_tunnel_encap_setup(struct ip_tunnel *t, |
260 | struct ip_tunnel_encap *ipencap); | |
c5441932 PS |
261 | |
262 | /* Extract dsfield from inner protocol */ | |
263 | static inline u8 ip_tunnel_get_dsfield(const struct iphdr *iph, | |
264 | const struct sk_buff *skb) | |
265 | { | |
266 | if (skb->protocol == htons(ETH_P_IP)) | |
267 | return iph->tos; | |
268 | else if (skb->protocol == htons(ETH_P_IPV6)) | |
269 | return ipv6_get_dsfield((const struct ipv6hdr *)iph); | |
270 | else | |
271 | return 0; | |
272 | } | |
273 | ||
274 | /* Propogate ECN bits out */ | |
275 | static inline u8 ip_tunnel_ecn_encap(u8 tos, const struct iphdr *iph, | |
276 | const struct sk_buff *skb) | |
277 | { | |
278 | u8 inner = ip_tunnel_get_dsfield(iph, skb); | |
279 | ||
280 | return INET_ECN_encapsulate(tos, inner); | |
281 | } | |
282 | ||
3d7b46cd | 283 | int iptunnel_pull_header(struct sk_buff *skb, int hdr_len, __be16 inner_proto); |
aad88724 | 284 | int iptunnel_xmit(struct sock *sk, struct rtable *rt, struct sk_buff *skb, |
6b8847c5 JB |
285 | __be32 src, __be32 dst, u8 proto, |
286 | u8 tos, u8 ttl, __be16 df, bool xnet); | |
0e6fbc5b | 287 | |
2d26f0a3 ED |
288 | struct sk_buff *iptunnel_handle_offloads(struct sk_buff *skb, bool gre_csum, |
289 | int gso_type_mask); | |
290 | ||
0e6fbc5b PS |
291 | static inline void iptunnel_xmit_stats(int err, |
292 | struct net_device_stats *err_stats, | |
8f84985f | 293 | struct pcpu_sw_netstats __percpu *stats) |
c5441932 | 294 | { |
0e6fbc5b | 295 | if (err > 0) { |
8f84985f | 296 | struct pcpu_sw_netstats *tstats = this_cpu_ptr(stats); |
c5441932 | 297 | |
c5441932 | 298 | u64_stats_update_begin(&tstats->syncp); |
0e6fbc5b | 299 | tstats->tx_bytes += err; |
c5441932 PS |
300 | tstats->tx_packets++; |
301 | u64_stats_update_end(&tstats->syncp); | |
0e6fbc5b PS |
302 | } else if (err < 0) { |
303 | err_stats->tx_errors++; | |
304 | err_stats->tx_aborted_errors++; | |
c5441932 | 305 | } else { |
0e6fbc5b | 306 | err_stats->tx_dropped++; |
c5441932 PS |
307 | } |
308 | } | |
5243b6ac | 309 | |
ee122c79 TG |
310 | static inline void *ip_tunnel_info_opts(struct ip_tunnel_info *info, size_t n) |
311 | { | |
312 | return info + 1; | |
313 | } | |
314 | ||
3093fbe7 TG |
315 | static inline struct ip_tunnel_info *lwt_tun_info(struct lwtunnel_state *lwtstate) |
316 | { | |
317 | return (struct ip_tunnel_info *)lwtstate->data; | |
318 | } | |
319 | ||
e7030878 TG |
320 | extern struct static_key ip_tunnel_metadata_cnt; |
321 | ||
322 | /* Returns > 0 if metadata should be collected */ | |
323 | static inline int ip_tunnel_collect_metadata(void) | |
324 | { | |
325 | return static_key_false(&ip_tunnel_metadata_cnt); | |
326 | } | |
327 | ||
045a0fa0 TG |
328 | void __init ip_tunnel_core_init(void); |
329 | ||
e7030878 TG |
330 | void ip_tunnel_need_metadata(void); |
331 | void ip_tunnel_unneed_metadata(void); | |
332 | ||
05283187 TG |
333 | #else /* CONFIG_INET */ |
334 | ||
335 | static inline struct ip_tunnel_info *lwt_tun_info(struct lwtunnel_state *lwtstate) | |
336 | { | |
337 | return NULL; | |
338 | } | |
339 | ||
340 | static inline void ip_tunnel_need_metadata(void) | |
341 | { | |
342 | } | |
343 | ||
344 | static inline void ip_tunnel_unneed_metadata(void) | |
345 | { | |
346 | } | |
347 | ||
5243b6ac JG |
348 | #endif /* CONFIG_INET */ |
349 | ||
c5441932 | 350 | #endif /* __NET_IP_TUNNELS_H */ |