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Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost
[cris-mirror.git] / include / net / ip_tunnels.h
blob1f16773cfd76b9bcd2deed0973eda1336e02317c
1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __NET_IP_TUNNELS_H
3 #define __NET_IP_TUNNELS_H 1
4
5 #include <linux/if_tunnel.h>
6 #include <linux/netdevice.h>
7 #include <linux/skbuff.h>
8 #include <linux/socket.h>
9 #include <linux/types.h>
10 #include <linux/u64_stats_sync.h>
11 #include <linux/bitops.h>
12
13 #include <net/dsfield.h>
14 #include <net/gro_cells.h>
15 #include <net/inet_ecn.h>
16 #include <net/netns/generic.h>
17 #include <net/rtnetlink.h>
18 #include <net/lwtunnel.h>
19 #include <net/dst_cache.h>
20
21 #if IS_ENABLED(CONFIG_IPV6)
22 #include <net/ipv6.h>
23 #include <net/ip6_fib.h>
24 #include <net/ip6_route.h>
25 #endif
26
27 /* Keep error state on tunnel for 30 sec */
28 #define IPTUNNEL_ERR_TIMEO (30*HZ)
29
30 /* Used to memset ip_tunnel padding. */
31 #define IP_TUNNEL_KEY_SIZE offsetofend(struct ip_tunnel_key, tp_dst)
32
33 /* Used to memset ipv4 address padding. */
34 #define IP_TUNNEL_KEY_IPV4_PAD offsetofend(struct ip_tunnel_key, u.ipv4.dst)
35 #define IP_TUNNEL_KEY_IPV4_PAD_LEN \
36 (FIELD_SIZEOF(struct ip_tunnel_key, u) - \
37 FIELD_SIZEOF(struct ip_tunnel_key, u.ipv4))
38
39 struct ip_tunnel_key {
40 __be64 tun_id;
41 union {
42 struct {
43 __be32 src;
44 __be32 dst;
45 } ipv4;
46 struct {
47 struct in6_addr src;
48 struct in6_addr dst;
49 } ipv6;
50 } u;
51 __be16 tun_flags;
52 u8 tos; /* TOS for IPv4, TC for IPv6 */
53 u8 ttl; /* TTL for IPv4, HL for IPv6 */
54 __be32 label; /* Flow Label for IPv6 */
55 __be16 tp_src;
56 __be16 tp_dst;
57 };
58
59 /* Flags for ip_tunnel_info mode. */
60 #define IP_TUNNEL_INFO_TX 0x01 /* represents tx tunnel parameters */
61 #define IP_TUNNEL_INFO_IPV6 0x02 /* key contains IPv6 addresses */
62 #define IP_TUNNEL_INFO_BRIDGE 0x04 /* represents a bridged tunnel id */
63
64 /* Maximum tunnel options length. */
65 #define IP_TUNNEL_OPTS_MAX \
66 GENMASK((FIELD_SIZEOF(struct ip_tunnel_info, \
67 options_len) * BITS_PER_BYTE) - 1, 0)
68
69 struct ip_tunnel_info {
70 struct ip_tunnel_key key;
71 #ifdef CONFIG_DST_CACHE
72 struct dst_cache dst_cache;
73 #endif
74 u8 options_len;
75 u8 mode;
76 };
77
78 /* 6rd prefix/relay information */
79 #ifdef CONFIG_IPV6_SIT_6RD
80 struct ip_tunnel_6rd_parm {
81 struct in6_addr prefix;
82 __be32 relay_prefix;
83 u16 prefixlen;
84 u16 relay_prefixlen;
85 };
86 #endif
87
88 struct ip_tunnel_encap {
89 u16 type;
90 u16 flags;
91 __be16 sport;
92 __be16 dport;
93 };
94
95 struct ip_tunnel_prl_entry {
96 struct ip_tunnel_prl_entry __rcu *next;
97 __be32 addr;
98 u16 flags;
99 struct rcu_head rcu_head;
100 };
101
102 struct metadata_dst;
103
104 struct ip_tunnel {
105 struct ip_tunnel __rcu *next;
106 struct hlist_node hash_node;
107 struct net_device *dev;
108 struct net *net; /* netns for packet i/o */
109
110 unsigned long err_time; /* Time when the last ICMP error
111 * arrived */
112 int err_count; /* Number of arrived ICMP errors */
113
114 /* These four fields used only by GRE */
115 u32 i_seqno; /* The last seen seqno */
116 u32 o_seqno; /* The last output seqno */
117 int tun_hlen; /* Precalculated header length */
118
119 /* These four fields used only by ERSPAN */
120 u32 index; /* ERSPAN type II index */
121 u8 erspan_ver; /* ERSPAN version */
122 u8 dir; /* ERSPAN direction */
123 u16 hwid; /* ERSPAN hardware ID */
124
125 struct dst_cache dst_cache;
126
127 struct ip_tunnel_parm parms;
128
129 int mlink;
130 int encap_hlen; /* Encap header length (FOU,GUE) */
131 int hlen; /* tun_hlen + encap_hlen */
132 struct ip_tunnel_encap encap;
133
134 /* for SIT */
135 #ifdef CONFIG_IPV6_SIT_6RD
136 struct ip_tunnel_6rd_parm ip6rd;
137 #endif
138 struct ip_tunnel_prl_entry __rcu *prl; /* potential router list */
139 unsigned int prl_count; /* # of entries in PRL */
140 unsigned int ip_tnl_net_id;
141 struct gro_cells gro_cells;
142 __u32 fwmark;
143 bool collect_md;
144 bool ignore_df;
145 };
146
147 #define TUNNEL_CSUM __cpu_to_be16(0x01)
148 #define TUNNEL_ROUTING __cpu_to_be16(0x02)
149 #define TUNNEL_KEY __cpu_to_be16(0x04)
150 #define TUNNEL_SEQ __cpu_to_be16(0x08)
151 #define TUNNEL_STRICT __cpu_to_be16(0x10)
152 #define TUNNEL_REC __cpu_to_be16(0x20)
153 #define TUNNEL_VERSION __cpu_to_be16(0x40)
154 #define TUNNEL_NO_KEY __cpu_to_be16(0x80)
155 #define TUNNEL_DONT_FRAGMENT __cpu_to_be16(0x0100)
156 #define TUNNEL_OAM __cpu_to_be16(0x0200)
157 #define TUNNEL_CRIT_OPT __cpu_to_be16(0x0400)
158 #define TUNNEL_GENEVE_OPT __cpu_to_be16(0x0800)
159 #define TUNNEL_VXLAN_OPT __cpu_to_be16(0x1000)
160 #define TUNNEL_NOCACHE __cpu_to_be16(0x2000)
161 #define TUNNEL_ERSPAN_OPT __cpu_to_be16(0x4000)
162
163 #define TUNNEL_OPTIONS_PRESENT \
164 (TUNNEL_GENEVE_OPT | TUNNEL_VXLAN_OPT | TUNNEL_ERSPAN_OPT)
165
166 struct tnl_ptk_info {
167 __be16 flags;
168 __be16 proto;
169 __be32 key;
170 __be32 seq;
171 int hdr_len;
172 };
173
174 #define PACKET_RCVD 0
175 #define PACKET_REJECT 1
176 #define PACKET_NEXT 2
177
178 #define IP_TNL_HASH_BITS 7
179 #define IP_TNL_HASH_SIZE (1 << IP_TNL_HASH_BITS)
180
181 struct ip_tunnel_net {
182 struct net_device *fb_tunnel_dev;
183 struct hlist_head tunnels[IP_TNL_HASH_SIZE];
184 struct ip_tunnel __rcu *collect_md_tun;
185 };
186
187 static inline void ip_tunnel_key_init(struct ip_tunnel_key *key,
188 __be32 saddr, __be32 daddr,
189 u8 tos, u8 ttl, __be32 label,
190 __be16 tp_src, __be16 tp_dst,
191 __be64 tun_id, __be16 tun_flags)
192 {
193 key->tun_id = tun_id;
194 key->u.ipv4.src = saddr;
195 key->u.ipv4.dst = daddr;
196 memset((unsigned char *)key + IP_TUNNEL_KEY_IPV4_PAD,
197 0, IP_TUNNEL_KEY_IPV4_PAD_LEN);
198 key->tos = tos;
199 key->ttl = ttl;
200 key->label = label;
201 key->tun_flags = tun_flags;
202
203 /* For the tunnel types on the top of IPsec, the tp_src and tp_dst of
204 * the upper tunnel are used.
205 * E.g: GRE over IPSEC, the tp_src and tp_port are zero.
206 */
207 key->tp_src = tp_src;
208 key->tp_dst = tp_dst;
209
210 /* Clear struct padding. */
211 if (sizeof(*key) != IP_TUNNEL_KEY_SIZE)
212 memset((unsigned char *)key + IP_TUNNEL_KEY_SIZE,
213 0, sizeof(*key) - IP_TUNNEL_KEY_SIZE);
214 }
215
216 static inline bool
217 ip_tunnel_dst_cache_usable(const struct sk_buff *skb,
218 const struct ip_tunnel_info *info)
219 {
220 if (skb->mark)
221 return false;
222 if (!info)
223 return true;
224 if (info->key.tun_flags & TUNNEL_NOCACHE)
225 return false;
226
227 return true;
228 }
229
230 static inline unsigned short ip_tunnel_info_af(const struct ip_tunnel_info
231 *tun_info)
232 {
233 return tun_info->mode & IP_TUNNEL_INFO_IPV6 ? AF_INET6 : AF_INET;
234 }
235
236 static inline __be64 key32_to_tunnel_id(__be32 key)
237 {
238 #ifdef __BIG_ENDIAN
239 return (__force __be64)key;
240 #else
241 return (__force __be64)((__force u64)key << 32);
242 #endif
243 }
244
245 /* Returns the least-significant 32 bits of a __be64. */
246 static inline __be32 tunnel_id_to_key32(__be64 tun_id)
247 {
248 #ifdef __BIG_ENDIAN
249 return (__force __be32)tun_id;
250 #else
251 return (__force __be32)((__force u64)tun_id >> 32);
252 #endif
253 }
254
255 #ifdef CONFIG_INET
256
257 int ip_tunnel_init(struct net_device *dev);
258 void ip_tunnel_uninit(struct net_device *dev);
259 void ip_tunnel_dellink(struct net_device *dev, struct list_head *head);
260 struct net *ip_tunnel_get_link_net(const struct net_device *dev);
261 int ip_tunnel_get_iflink(const struct net_device *dev);
262 int ip_tunnel_init_net(struct net *net, unsigned int ip_tnl_net_id,
263 struct rtnl_link_ops *ops, char *devname);
264
265 void ip_tunnel_delete_nets(struct list_head *list_net, unsigned int id,
266 struct rtnl_link_ops *ops);
267
268 void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev,
269 const struct iphdr *tnl_params, const u8 protocol);
270 void ip_md_tunnel_xmit(struct sk_buff *skb, struct net_device *dev,
271 const u8 proto);
272 int ip_tunnel_ioctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd);
273 int __ip_tunnel_change_mtu(struct net_device *dev, int new_mtu, bool strict);
274 int ip_tunnel_change_mtu(struct net_device *dev, int new_mtu);
275
276 void ip_tunnel_get_stats64(struct net_device *dev,
277 struct rtnl_link_stats64 *tot);
278 struct ip_tunnel *ip_tunnel_lookup(struct ip_tunnel_net *itn,
279 int link, __be16 flags,
280 __be32 remote, __be32 local,
281 __be32 key);
282
283 int ip_tunnel_rcv(struct ip_tunnel *tunnel, struct sk_buff *skb,
284 const struct tnl_ptk_info *tpi, struct metadata_dst *tun_dst,
285 bool log_ecn_error);
286 int ip_tunnel_changelink(struct net_device *dev, struct nlattr *tb[],
287 struct ip_tunnel_parm *p, __u32 fwmark);
288 int ip_tunnel_newlink(struct net_device *dev, struct nlattr *tb[],
289 struct ip_tunnel_parm *p, __u32 fwmark);
290 void ip_tunnel_setup(struct net_device *dev, unsigned int net_id);
291
292 struct ip_tunnel_encap_ops {
293 size_t (*encap_hlen)(struct ip_tunnel_encap *e);
294 int (*build_header)(struct sk_buff *skb, struct ip_tunnel_encap *e,
295 u8 *protocol, struct flowi4 *fl4);
296 };
297
298 #define MAX_IPTUN_ENCAP_OPS 8
299
300 extern const struct ip_tunnel_encap_ops __rcu *
301 iptun_encaps[MAX_IPTUN_ENCAP_OPS];
302
303 int ip_tunnel_encap_add_ops(const struct ip_tunnel_encap_ops *op,
304 unsigned int num);
305 int ip_tunnel_encap_del_ops(const struct ip_tunnel_encap_ops *op,
306 unsigned int num);
307
308 int ip_tunnel_encap_setup(struct ip_tunnel *t,
309 struct ip_tunnel_encap *ipencap);
310
311 static inline int ip_encap_hlen(struct ip_tunnel_encap *e)
312 {
313 const struct ip_tunnel_encap_ops *ops;
314 int hlen = -EINVAL;
315
316 if (e->type == TUNNEL_ENCAP_NONE)
317 return 0;
318
319 if (e->type >= MAX_IPTUN_ENCAP_OPS)
320 return -EINVAL;
321
322 rcu_read_lock();
323 ops = rcu_dereference(iptun_encaps[e->type]);
324 if (likely(ops && ops->encap_hlen))
325 hlen = ops->encap_hlen(e);
326 rcu_read_unlock();
327
328 return hlen;
329 }
330
331 static inline int ip_tunnel_encap(struct sk_buff *skb, struct ip_tunnel *t,
332 u8 *protocol, struct flowi4 *fl4)
333 {
334 const struct ip_tunnel_encap_ops *ops;
335 int ret = -EINVAL;
336
337 if (t->encap.type == TUNNEL_ENCAP_NONE)
338 return 0;
339
340 if (t->encap.type >= MAX_IPTUN_ENCAP_OPS)
341 return -EINVAL;
342
343 rcu_read_lock();
344 ops = rcu_dereference(iptun_encaps[t->encap.type]);
345 if (likely(ops && ops->build_header))
346 ret = ops->build_header(skb, &t->encap, protocol, fl4);
347 rcu_read_unlock();
348
349 return ret;
350 }
351
352 /* Extract dsfield from inner protocol */
353 static inline u8 ip_tunnel_get_dsfield(const struct iphdr *iph,
354 const struct sk_buff *skb)
355 {
356 if (skb->protocol == htons(ETH_P_IP))
357 return iph->tos;
358 else if (skb->protocol == htons(ETH_P_IPV6))
359 return ipv6_get_dsfield((const struct ipv6hdr *)iph);
360 else
361 return 0;
362 }
363
364 /* Propogate ECN bits out */
365 static inline u8 ip_tunnel_ecn_encap(u8 tos, const struct iphdr *iph,
366 const struct sk_buff *skb)
367 {
368 u8 inner = ip_tunnel_get_dsfield(iph, skb);
369
370 return INET_ECN_encapsulate(tos, inner);
371 }
372
373 int __iptunnel_pull_header(struct sk_buff *skb, int hdr_len,
374 __be16 inner_proto, bool raw_proto, bool xnet);
375
376 static inline int iptunnel_pull_header(struct sk_buff *skb, int hdr_len,
377 __be16 inner_proto, bool xnet)
378 {
379 return __iptunnel_pull_header(skb, hdr_len, inner_proto, false, xnet);
380 }
381
382 void iptunnel_xmit(struct sock *sk, struct rtable *rt, struct sk_buff *skb,
383 __be32 src, __be32 dst, u8 proto,
384 u8 tos, u8 ttl, __be16 df, bool xnet);
385 struct metadata_dst *iptunnel_metadata_reply(struct metadata_dst *md,
386 gfp_t flags);
387
388 int iptunnel_handle_offloads(struct sk_buff *skb, int gso_type_mask);
389
390 static inline int iptunnel_pull_offloads(struct sk_buff *skb)
391 {
392 if (skb_is_gso(skb)) {
393 int err;
394
395 err = skb_unclone(skb, GFP_ATOMIC);
396 if (unlikely(err))
397 return err;
398 skb_shinfo(skb)->gso_type &= ~(NETIF_F_GSO_ENCAP_ALL >>
399 NETIF_F_GSO_SHIFT);
400 }
401
402 skb->encapsulation = 0;
403 return 0;
404 }
405
406 static inline void iptunnel_xmit_stats(struct net_device *dev, int pkt_len)
407 {
408 if (pkt_len > 0) {
409 struct pcpu_sw_netstats *tstats = get_cpu_ptr(dev->tstats);
410
411 u64_stats_update_begin(&tstats->syncp);
412 tstats->tx_bytes += pkt_len;
413 tstats->tx_packets++;
414 u64_stats_update_end(&tstats->syncp);
415 put_cpu_ptr(tstats);
416 } else {
417 struct net_device_stats *err_stats = &dev->stats;
418
419 if (pkt_len < 0) {
420 err_stats->tx_errors++;
421 err_stats->tx_aborted_errors++;
422 } else {
423 err_stats->tx_dropped++;
424 }
425 }
426 }
427
428 static inline void *ip_tunnel_info_opts(struct ip_tunnel_info *info)
429 {
430 return info + 1;
431 }
432
433 static inline void ip_tunnel_info_opts_get(void *to,
434 const struct ip_tunnel_info *info)
435 {
436 memcpy(to, info + 1, info->options_len);
437 }
438
439 static inline void ip_tunnel_info_opts_set(struct ip_tunnel_info *info,
440 const void *from, int len)
441 {
442 memcpy(ip_tunnel_info_opts(info), from, len);
443 info->options_len = len;
444 }
445
446 static inline struct ip_tunnel_info *lwt_tun_info(struct lwtunnel_state *lwtstate)
447 {
448 return (struct ip_tunnel_info *)lwtstate->data;
449 }
450
451 extern struct static_key ip_tunnel_metadata_cnt;
452
453 /* Returns > 0 if metadata should be collected */
454 static inline int ip_tunnel_collect_metadata(void)
455 {
456 return static_key_false(&ip_tunnel_metadata_cnt);
457 }
458
459 void __init ip_tunnel_core_init(void);
460
461 void ip_tunnel_need_metadata(void);
462 void ip_tunnel_unneed_metadata(void);
463
464 #else /* CONFIG_INET */
465
466 static inline struct ip_tunnel_info *lwt_tun_info(struct lwtunnel_state *lwtstate)
467 {
468 return NULL;
469 }
470
471 static inline void ip_tunnel_need_metadata(void)
472 {
473 }
474
475 static inline void ip_tunnel_unneed_metadata(void)
476 {
477 }
478
479 static inline void ip_tunnel_info_opts_get(void *to,
480 const struct ip_tunnel_info *info)
481 {
482 }
483
484 static inline void ip_tunnel_info_opts_set(struct ip_tunnel_info *info,
485 const void *from, int len)
486 {
487 info->options_len = 0;
488 }
489
490 #endif /* CONFIG_INET */
491
492 #endif /* __NET_IP_TUNNELS_H */
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