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 (sizeof_field(struct ip_tunnel_key, u) - \
37 sizeof_field(struct ip_tunnel_key, u.ipv4))
38
39 #define __ipt_flag_op(op, ...) \
40 op(__VA_ARGS__, __IP_TUNNEL_FLAG_NUM)
41
42 #define IP_TUNNEL_DECLARE_FLAGS(...) \
43 __ipt_flag_op(DECLARE_BITMAP, __VA_ARGS__)
44
45 #define ip_tunnel_flags_zero(...) __ipt_flag_op(bitmap_zero, __VA_ARGS__)
46 #define ip_tunnel_flags_copy(...) __ipt_flag_op(bitmap_copy, __VA_ARGS__)
47 #define ip_tunnel_flags_and(...) __ipt_flag_op(bitmap_and, __VA_ARGS__)
48 #define ip_tunnel_flags_or(...) __ipt_flag_op(bitmap_or, __VA_ARGS__)
49
50 #define ip_tunnel_flags_empty(...) \
51 __ipt_flag_op(bitmap_empty, __VA_ARGS__)
52 #define ip_tunnel_flags_intersect(...) \
53 __ipt_flag_op(bitmap_intersects, __VA_ARGS__)
54 #define ip_tunnel_flags_subset(...) \
55 __ipt_flag_op(bitmap_subset, __VA_ARGS__)
56
57 struct ip_tunnel_key {
58 __be64 tun_id;
59 union {
60 struct {
61 __be32 src;
62 __be32 dst;
63 } ipv4;
64 struct {
65 struct in6_addr src;
66 struct in6_addr dst;
67 } ipv6;
68 } u;
69 IP_TUNNEL_DECLARE_FLAGS(tun_flags);
70 __be32 label; /* Flow Label for IPv6 */
71 u32 nhid;
72 u8 tos; /* TOS for IPv4, TC for IPv6 */
73 u8 ttl; /* TTL for IPv4, HL for IPv6 */
74 __be16 tp_src;
75 __be16 tp_dst;
76 __u8 flow_flags;
77 };
78
79 struct ip_tunnel_encap {
80 u16 type;
81 u16 flags;
82 __be16 sport;
83 __be16 dport;
84 };
85
86 /* Flags for ip_tunnel_info mode. */
87 #define IP_TUNNEL_INFO_TX 0x01 /* represents tx tunnel parameters */
88 #define IP_TUNNEL_INFO_IPV6 0x02 /* key contains IPv6 addresses */
89 #define IP_TUNNEL_INFO_BRIDGE 0x04 /* represents a bridged tunnel id */
90
91 /* Maximum tunnel options length. */
92 #define IP_TUNNEL_OPTS_MAX \
93 GENMASK((sizeof_field(struct ip_tunnel_info, \
94 options_len) * BITS_PER_BYTE) - 1, 0)
95
96 #define ip_tunnel_info_opts(info) \
97 _Generic(info, \
98 const struct ip_tunnel_info * : ((const void *)(info)->options),\
99 struct ip_tunnel_info * : ((void *)(info)->options)\
100 )
101
102 struct ip_tunnel_info {
103 struct ip_tunnel_key key;
104 struct ip_tunnel_encap encap;
105 #ifdef CONFIG_DST_CACHE
106 struct dst_cache dst_cache;
107 #endif
108 u8 options_len;
109 u8 mode;
110 u8 options[] __aligned_largest __counted_by(options_len);
111 };
112
113 /* 6rd prefix/relay information */
114 #ifdef CONFIG_IPV6_SIT_6RD
115 struct ip_tunnel_6rd_parm {
116 struct in6_addr prefix;
117 __be32 relay_prefix;
118 u16 prefixlen;
119 u16 relay_prefixlen;
120 };
121 #endif
122
123 struct ip_tunnel_prl_entry {
124 struct ip_tunnel_prl_entry __rcu *next;
125 __be32 addr;
126 u16 flags;
127 struct rcu_head rcu_head;
128 };
129
130 struct metadata_dst;
131
132 /* Kernel-side variant of ip_tunnel_parm */
133 struct ip_tunnel_parm_kern {
134 char name[IFNAMSIZ];
135 IP_TUNNEL_DECLARE_FLAGS(i_flags);
136 IP_TUNNEL_DECLARE_FLAGS(o_flags);
137 __be32 i_key;
138 __be32 o_key;
139 int link;
140 struct iphdr iph;
141 };
142
143 struct ip_tunnel {
144 struct ip_tunnel __rcu *next;
145 struct hlist_node hash_node;
146
147 struct net_device *dev;
148 netdevice_tracker dev_tracker;
149
150 struct net *net; /* netns for packet i/o */
151
152 unsigned long err_time; /* Time when the last ICMP error
153 * arrived */
154 int err_count; /* Number of arrived ICMP errors */
155
156 /* These four fields used only by GRE */
157 u32 i_seqno; /* The last seen seqno */
158 atomic_t o_seqno; /* The last output seqno */
159 int tun_hlen; /* Precalculated header length */
160
161 /* These four fields used only by ERSPAN */
162 u32 index; /* ERSPAN type II index */
163 u8 erspan_ver; /* ERSPAN version */
164 u8 dir; /* ERSPAN direction */
165 u16 hwid; /* ERSPAN hardware ID */
166
167 struct dst_cache dst_cache;
168
169 struct ip_tunnel_parm_kern parms;
170
171 int mlink;
172 int encap_hlen; /* Encap header length (FOU,GUE) */
173 int hlen; /* tun_hlen + encap_hlen */
174 struct ip_tunnel_encap encap;
175
176 /* for SIT */
177 #ifdef CONFIG_IPV6_SIT_6RD
178 struct ip_tunnel_6rd_parm ip6rd;
179 #endif
180 struct ip_tunnel_prl_entry __rcu *prl; /* potential router list */
181 unsigned int prl_count; /* # of entries in PRL */
182 unsigned int ip_tnl_net_id;
183 struct gro_cells gro_cells;
184 __u32 fwmark;
185 bool collect_md;
186 bool ignore_df;
187 };
188
189 struct tnl_ptk_info {
190 IP_TUNNEL_DECLARE_FLAGS(flags);
191 __be16 proto;
192 __be32 key;
193 __be32 seq;
194 int hdr_len;
195 };
196
197 #define PACKET_RCVD 0
198 #define PACKET_REJECT 1
199 #define PACKET_NEXT 2
200
201 #define IP_TNL_HASH_BITS 7
202 #define IP_TNL_HASH_SIZE (1 << IP_TNL_HASH_BITS)
203
204 struct ip_tunnel_net {
205 struct net_device *fb_tunnel_dev;
206 struct rtnl_link_ops *rtnl_link_ops;
207 struct hlist_head tunnels[IP_TNL_HASH_SIZE];
208 struct ip_tunnel __rcu *collect_md_tun;
209 int type;
210 };
211
ip_tunnel_set_options_present(unsigned long * flags)212 static inline void ip_tunnel_set_options_present(unsigned long *flags)
213 {
214 IP_TUNNEL_DECLARE_FLAGS(present) = { };
215
216 __set_bit(IP_TUNNEL_GENEVE_OPT_BIT, present);
217 __set_bit(IP_TUNNEL_VXLAN_OPT_BIT, present);
218 __set_bit(IP_TUNNEL_ERSPAN_OPT_BIT, present);
219 __set_bit(IP_TUNNEL_GTP_OPT_BIT, present);
220 __set_bit(IP_TUNNEL_PFCP_OPT_BIT, present);
221
222 ip_tunnel_flags_or(flags, flags, present);
223 }
224
ip_tunnel_clear_options_present(unsigned long * flags)225 static inline void ip_tunnel_clear_options_present(unsigned long *flags)
226 {
227 IP_TUNNEL_DECLARE_FLAGS(present) = { };
228
229 __set_bit(IP_TUNNEL_GENEVE_OPT_BIT, present);
230 __set_bit(IP_TUNNEL_VXLAN_OPT_BIT, present);
231 __set_bit(IP_TUNNEL_ERSPAN_OPT_BIT, present);
232 __set_bit(IP_TUNNEL_GTP_OPT_BIT, present);
233 __set_bit(IP_TUNNEL_PFCP_OPT_BIT, present);
234
235 __ipt_flag_op(bitmap_andnot, flags, flags, present);
236 }
237
ip_tunnel_is_options_present(const unsigned long * flags)238 static inline bool ip_tunnel_is_options_present(const unsigned long *flags)
239 {
240 IP_TUNNEL_DECLARE_FLAGS(present) = { };
241
242 __set_bit(IP_TUNNEL_GENEVE_OPT_BIT, present);
243 __set_bit(IP_TUNNEL_VXLAN_OPT_BIT, present);
244 __set_bit(IP_TUNNEL_ERSPAN_OPT_BIT, present);
245 __set_bit(IP_TUNNEL_GTP_OPT_BIT, present);
246 __set_bit(IP_TUNNEL_PFCP_OPT_BIT, present);
247
248 return ip_tunnel_flags_intersect(flags, present);
249 }
250
ip_tunnel_flags_is_be16_compat(const unsigned long * flags)251 static inline bool ip_tunnel_flags_is_be16_compat(const unsigned long *flags)
252 {
253 IP_TUNNEL_DECLARE_FLAGS(supp) = { };
254
255 bitmap_set(supp, 0, BITS_PER_TYPE(__be16));
256 __set_bit(IP_TUNNEL_VTI_BIT, supp);
257
258 return ip_tunnel_flags_subset(flags, supp);
259 }
260
ip_tunnel_flags_from_be16(unsigned long * dst,__be16 flags)261 static inline void ip_tunnel_flags_from_be16(unsigned long *dst, __be16 flags)
262 {
263 ip_tunnel_flags_zero(dst);
264
265 bitmap_write(dst, be16_to_cpu(flags), 0, BITS_PER_TYPE(__be16));
266 __assign_bit(IP_TUNNEL_VTI_BIT, dst, flags & VTI_ISVTI);
267 }
268
ip_tunnel_flags_to_be16(const unsigned long * flags)269 static inline __be16 ip_tunnel_flags_to_be16(const unsigned long *flags)
270 {
271 __be16 ret;
272
273 ret = cpu_to_be16(bitmap_read(flags, 0, BITS_PER_TYPE(__be16)));
274 if (test_bit(IP_TUNNEL_VTI_BIT, flags))
275 ret |= VTI_ISVTI;
276
277 return ret;
278 }
279
ip_tunnel_key_init(struct ip_tunnel_key * key,__be32 saddr,__be32 daddr,u8 tos,u8 ttl,__be32 label,__be16 tp_src,__be16 tp_dst,__be64 tun_id,const unsigned long * tun_flags)280 static inline void ip_tunnel_key_init(struct ip_tunnel_key *key,
281 __be32 saddr, __be32 daddr,
282 u8 tos, u8 ttl, __be32 label,
283 __be16 tp_src, __be16 tp_dst,
284 __be64 tun_id,
285 const unsigned long *tun_flags)
286 {
287 key->tun_id = tun_id;
288 key->u.ipv4.src = saddr;
289 key->u.ipv4.dst = daddr;
290 memset((unsigned char *)key + IP_TUNNEL_KEY_IPV4_PAD,
291 0, IP_TUNNEL_KEY_IPV4_PAD_LEN);
292 key->tos = tos;
293 key->ttl = ttl;
294 key->label = label;
295 ip_tunnel_flags_copy(key->tun_flags, tun_flags);
296
297 /* For the tunnel types on the top of IPsec, the tp_src and tp_dst of
298 * the upper tunnel are used.
299 * E.g: GRE over IPSEC, the tp_src and tp_port are zero.
300 */
301 key->tp_src = tp_src;
302 key->tp_dst = tp_dst;
303
304 /* Clear struct padding. */
305 if (sizeof(*key) != IP_TUNNEL_KEY_SIZE)
306 memset((unsigned char *)key + IP_TUNNEL_KEY_SIZE,
307 0, sizeof(*key) - IP_TUNNEL_KEY_SIZE);
308 }
309
310 static inline bool
ip_tunnel_dst_cache_usable(const struct sk_buff * skb,const struct ip_tunnel_info * info)311 ip_tunnel_dst_cache_usable(const struct sk_buff *skb,
312 const struct ip_tunnel_info *info)
313 {
314 if (skb->mark)
315 return false;
316
317 return !info || !test_bit(IP_TUNNEL_NOCACHE_BIT, info->key.tun_flags);
318 }
319
ip_tunnel_info_af(const struct ip_tunnel_info * tun_info)320 static inline unsigned short ip_tunnel_info_af(const struct ip_tunnel_info
321 *tun_info)
322 {
323 return tun_info->mode & IP_TUNNEL_INFO_IPV6 ? AF_INET6 : AF_INET;
324 }
325
key32_to_tunnel_id(__be32 key)326 static inline __be64 key32_to_tunnel_id(__be32 key)
327 {
328 #ifdef __BIG_ENDIAN
329 return (__force __be64)key;
330 #else
331 return (__force __be64)((__force u64)key << 32);
332 #endif
333 }
334
335 /* Returns the least-significant 32 bits of a __be64. */
tunnel_id_to_key32(__be64 tun_id)336 static inline __be32 tunnel_id_to_key32(__be64 tun_id)
337 {
338 #ifdef __BIG_ENDIAN
339 return (__force __be32)tun_id;
340 #else
341 return (__force __be32)((__force u64)tun_id >> 32);
342 #endif
343 }
344
345 #ifdef CONFIG_INET
346
ip_tunnel_init_flow(struct flowi4 * fl4,int proto,__be32 daddr,__be32 saddr,__be32 key,__u8 tos,struct net * net,int oif,__u32 mark,__u32 tun_inner_hash,__u8 flow_flags)347 static inline void ip_tunnel_init_flow(struct flowi4 *fl4,
348 int proto,
349 __be32 daddr, __be32 saddr,
350 __be32 key, __u8 tos,
351 struct net *net, int oif,
352 __u32 mark, __u32 tun_inner_hash,
353 __u8 flow_flags)
354 {
355 memset(fl4, 0, sizeof(*fl4));
356
357 if (oif) {
358 fl4->flowi4_l3mdev = l3mdev_master_upper_ifindex_by_index(net, oif);
359 /* Legacy VRF/l3mdev use case */
360 fl4->flowi4_oif = fl4->flowi4_l3mdev ? 0 : oif;
361 }
362
363 fl4->daddr = daddr;
364 fl4->saddr = saddr;
365 fl4->flowi4_tos = tos;
366 fl4->flowi4_proto = proto;
367 fl4->fl4_gre_key = key;
368 fl4->flowi4_mark = mark;
369 fl4->flowi4_multipath_hash = tun_inner_hash;
370 fl4->flowi4_flags = flow_flags;
371 }
372
373 int ip_tunnel_init(struct net_device *dev);
374 void ip_tunnel_uninit(struct net_device *dev);
375 void ip_tunnel_dellink(struct net_device *dev, struct list_head *head);
376 struct net *ip_tunnel_get_link_net(const struct net_device *dev);
377 int ip_tunnel_get_iflink(const struct net_device *dev);
378 int ip_tunnel_init_net(struct net *net, unsigned int ip_tnl_net_id,
379 struct rtnl_link_ops *ops, char *devname);
380 void ip_tunnel_delete_net(struct net *net, unsigned int id,
381 struct rtnl_link_ops *ops,
382 struct list_head *dev_to_kill);
383
384 void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev,
385 const struct iphdr *tnl_params, const u8 protocol);
386 void ip_md_tunnel_xmit(struct sk_buff *skb, struct net_device *dev,
387 const u8 proto, int tunnel_hlen);
388 int ip_tunnel_ctl(struct net_device *dev, struct ip_tunnel_parm_kern *p,
389 int cmd);
390 bool ip_tunnel_parm_from_user(struct ip_tunnel_parm_kern *kp,
391 const void __user *data);
392 bool ip_tunnel_parm_to_user(void __user *data, struct ip_tunnel_parm_kern *kp);
393 int ip_tunnel_siocdevprivate(struct net_device *dev, struct ifreq *ifr,
394 void __user *data, int cmd);
395 int __ip_tunnel_change_mtu(struct net_device *dev, int new_mtu, bool strict);
396 int ip_tunnel_change_mtu(struct net_device *dev, int new_mtu);
397
398 struct ip_tunnel *ip_tunnel_lookup(struct ip_tunnel_net *itn,
399 int link, const unsigned long *flags,
400 __be32 remote, __be32 local,
401 __be32 key);
402
403 void ip_tunnel_md_udp_encap(struct sk_buff *skb, struct ip_tunnel_info *info);
404 int ip_tunnel_rcv(struct ip_tunnel *tunnel, struct sk_buff *skb,
405 const struct tnl_ptk_info *tpi, struct metadata_dst *tun_dst,
406 bool log_ecn_error);
407 int ip_tunnel_changelink(struct net_device *dev, struct nlattr *tb[],
408 struct ip_tunnel_parm_kern *p, __u32 fwmark);
409 int ip_tunnel_newlink(struct net *net, struct net_device *dev,
410 struct nlattr *tb[], struct ip_tunnel_parm_kern *p,
411 __u32 fwmark);
412 void ip_tunnel_setup(struct net_device *dev, unsigned int net_id);
413
414 bool ip_tunnel_netlink_encap_parms(struct nlattr *data[],
415 struct ip_tunnel_encap *encap);
416
417 void ip_tunnel_netlink_parms(struct nlattr *data[],
418 struct ip_tunnel_parm_kern *parms);
419
420 extern const struct header_ops ip_tunnel_header_ops;
421 __be16 ip_tunnel_parse_protocol(const struct sk_buff *skb);
422
423 struct ip_tunnel_encap_ops {
424 size_t (*encap_hlen)(struct ip_tunnel_encap *e);
425 int (*build_header)(struct sk_buff *skb, struct ip_tunnel_encap *e,
426 u8 *protocol, struct flowi4 *fl4);
427 int (*err_handler)(struct sk_buff *skb, u32 info);
428 };
429
430 #define MAX_IPTUN_ENCAP_OPS 8
431
432 extern const struct ip_tunnel_encap_ops __rcu *
433 iptun_encaps[MAX_IPTUN_ENCAP_OPS];
434
435 int ip_tunnel_encap_add_ops(const struct ip_tunnel_encap_ops *op,
436 unsigned int num);
437 int ip_tunnel_encap_del_ops(const struct ip_tunnel_encap_ops *op,
438 unsigned int num);
439
440 int ip_tunnel_encap_setup(struct ip_tunnel *t,
441 struct ip_tunnel_encap *ipencap);
442
443 static inline enum skb_drop_reason
pskb_inet_may_pull_reason(struct sk_buff * skb)444 pskb_inet_may_pull_reason(struct sk_buff *skb)
445 {
446 int nhlen;
447
448 switch (skb->protocol) {
449 #if IS_ENABLED(CONFIG_IPV6)
450 case htons(ETH_P_IPV6):
451 nhlen = sizeof(struct ipv6hdr);
452 break;
453 #endif
454 case htons(ETH_P_IP):
455 nhlen = sizeof(struct iphdr);
456 break;
457 default:
458 nhlen = 0;
459 }
460
461 return pskb_network_may_pull_reason(skb, nhlen);
462 }
463
pskb_inet_may_pull(struct sk_buff * skb)464 static inline bool pskb_inet_may_pull(struct sk_buff *skb)
465 {
466 return pskb_inet_may_pull_reason(skb) == SKB_NOT_DROPPED_YET;
467 }
468
469 /* Variant of pskb_inet_may_pull().
470 */
471 static inline enum skb_drop_reason
skb_vlan_inet_prepare(struct sk_buff * skb,bool inner_proto_inherit)472 skb_vlan_inet_prepare(struct sk_buff *skb, bool inner_proto_inherit)
473 {
474 int nhlen = 0, maclen = inner_proto_inherit ? 0 : ETH_HLEN;
475 __be16 type = skb->protocol;
476 enum skb_drop_reason reason;
477
478 /* Essentially this is skb_protocol(skb, true)
479 * And we get MAC len.
480 */
481 if (eth_type_vlan(type))
482 type = __vlan_get_protocol(skb, type, &maclen);
483
484 switch (type) {
485 #if IS_ENABLED(CONFIG_IPV6)
486 case htons(ETH_P_IPV6):
487 nhlen = sizeof(struct ipv6hdr);
488 break;
489 #endif
490 case htons(ETH_P_IP):
491 nhlen = sizeof(struct iphdr);
492 break;
493 }
494 /* For ETH_P_IPV6/ETH_P_IP we make sure to pull
495 * a base network header in skb->head.
496 */
497 reason = pskb_may_pull_reason(skb, maclen + nhlen);
498 if (reason)
499 return reason;
500
501 skb_set_network_header(skb, maclen);
502
503 return SKB_NOT_DROPPED_YET;
504 }
505
ip_encap_hlen(struct ip_tunnel_encap * e)506 static inline int ip_encap_hlen(struct ip_tunnel_encap *e)
507 {
508 const struct ip_tunnel_encap_ops *ops;
509 int hlen = -EINVAL;
510
511 if (e->type == TUNNEL_ENCAP_NONE)
512 return 0;
513
514 if (e->type >= MAX_IPTUN_ENCAP_OPS)
515 return -EINVAL;
516
517 rcu_read_lock();
518 ops = rcu_dereference(iptun_encaps[e->type]);
519 if (likely(ops && ops->encap_hlen))
520 hlen = ops->encap_hlen(e);
521 rcu_read_unlock();
522
523 return hlen;
524 }
525
ip_tunnel_encap(struct sk_buff * skb,struct ip_tunnel_encap * e,u8 * protocol,struct flowi4 * fl4)526 static inline int ip_tunnel_encap(struct sk_buff *skb,
527 struct ip_tunnel_encap *e,
528 u8 *protocol, struct flowi4 *fl4)
529 {
530 const struct ip_tunnel_encap_ops *ops;
531 int ret = -EINVAL;
532
533 if (e->type == TUNNEL_ENCAP_NONE)
534 return 0;
535
536 if (e->type >= MAX_IPTUN_ENCAP_OPS)
537 return -EINVAL;
538
539 rcu_read_lock();
540 ops = rcu_dereference(iptun_encaps[e->type]);
541 if (likely(ops && ops->build_header))
542 ret = ops->build_header(skb, e, protocol, fl4);
543 rcu_read_unlock();
544
545 return ret;
546 }
547
548 /* Extract dsfield from inner protocol */
ip_tunnel_get_dsfield(const struct iphdr * iph,const struct sk_buff * skb)549 static inline u8 ip_tunnel_get_dsfield(const struct iphdr *iph,
550 const struct sk_buff *skb)
551 {
552 __be16 payload_protocol = skb_protocol(skb, true);
553
554 if (payload_protocol == htons(ETH_P_IP))
555 return iph->tos;
556 else if (payload_protocol == htons(ETH_P_IPV6))
557 return ipv6_get_dsfield((const struct ipv6hdr *)iph);
558 else
559 return 0;
560 }
561
ip_tunnel_get_flowlabel(const struct iphdr * iph,const struct sk_buff * skb)562 static inline __be32 ip_tunnel_get_flowlabel(const struct iphdr *iph,
563 const struct sk_buff *skb)
564 {
565 __be16 payload_protocol = skb_protocol(skb, true);
566
567 if (payload_protocol == htons(ETH_P_IPV6))
568 return ip6_flowlabel((const struct ipv6hdr *)iph);
569 else
570 return 0;
571 }
572
ip_tunnel_get_ttl(const struct iphdr * iph,const struct sk_buff * skb)573 static inline u8 ip_tunnel_get_ttl(const struct iphdr *iph,
574 const struct sk_buff *skb)
575 {
576 __be16 payload_protocol = skb_protocol(skb, true);
577
578 if (payload_protocol == htons(ETH_P_IP))
579 return iph->ttl;
580 else if (payload_protocol == htons(ETH_P_IPV6))
581 return ((const struct ipv6hdr *)iph)->hop_limit;
582 else
583 return 0;
584 }
585
586 /* Propagate ECN bits out */
ip_tunnel_ecn_encap(u8 tos,const struct iphdr * iph,const struct sk_buff * skb)587 static inline u8 ip_tunnel_ecn_encap(u8 tos, const struct iphdr *iph,
588 const struct sk_buff *skb)
589 {
590 u8 inner = ip_tunnel_get_dsfield(iph, skb);
591
592 return INET_ECN_encapsulate(tos, inner);
593 }
594
595 int __iptunnel_pull_header(struct sk_buff *skb, int hdr_len,
596 __be16 inner_proto, bool raw_proto, bool xnet);
597
iptunnel_pull_header(struct sk_buff * skb,int hdr_len,__be16 inner_proto,bool xnet)598 static inline int iptunnel_pull_header(struct sk_buff *skb, int hdr_len,
599 __be16 inner_proto, bool xnet)
600 {
601 return __iptunnel_pull_header(skb, hdr_len, inner_proto, false, xnet);
602 }
603
604 void iptunnel_xmit(struct sock *sk, struct rtable *rt, struct sk_buff *skb,
605 __be32 src, __be32 dst, u8 proto,
606 u8 tos, u8 ttl, __be16 df, bool xnet, u16 ipcb_flags);
607 struct metadata_dst *iptunnel_metadata_reply(struct metadata_dst *md,
608 gfp_t flags);
609 int skb_tunnel_check_pmtu(struct sk_buff *skb, struct dst_entry *encap_dst,
610 int headroom, bool reply);
611
612 int iptunnel_handle_offloads(struct sk_buff *skb, int gso_type_mask);
613
iptunnel_pull_offloads(struct sk_buff * skb)614 static inline int iptunnel_pull_offloads(struct sk_buff *skb)
615 {
616 if (skb_is_gso(skb)) {
617 int err;
618
619 err = skb_unclone(skb, GFP_ATOMIC);
620 if (unlikely(err))
621 return err;
622 skb_shinfo(skb)->gso_type &= ~(NETIF_F_GSO_ENCAP_ALL >>
623 NETIF_F_GSO_SHIFT);
624 }
625
626 skb->encapsulation = 0;
627 return 0;
628 }
629
iptunnel_xmit_stats(struct net_device * dev,int pkt_len)630 static inline void iptunnel_xmit_stats(struct net_device *dev, int pkt_len)
631 {
632 if (pkt_len > 0) {
633 struct pcpu_sw_netstats *tstats = get_cpu_ptr(dev->tstats);
634
635 u64_stats_update_begin(&tstats->syncp);
636 u64_stats_add(&tstats->tx_bytes, pkt_len);
637 u64_stats_inc(&tstats->tx_packets);
638 u64_stats_update_end(&tstats->syncp);
639 put_cpu_ptr(tstats);
640 return;
641 }
642
643 if (pkt_len < 0) {
644 DEV_STATS_INC(dev, tx_errors);
645 DEV_STATS_INC(dev, tx_aborted_errors);
646 } else {
647 DEV_STATS_INC(dev, tx_dropped);
648 }
649 }
650
ip_tunnel_info_opts_get(void * to,const struct ip_tunnel_info * info)651 static inline void ip_tunnel_info_opts_get(void *to,
652 const struct ip_tunnel_info *info)
653 {
654 memcpy(to, ip_tunnel_info_opts(info), info->options_len);
655 }
656
ip_tunnel_info_opts_set(struct ip_tunnel_info * info,const void * from,int len,const unsigned long * flags)657 static inline void ip_tunnel_info_opts_set(struct ip_tunnel_info *info,
658 const void *from, int len,
659 const unsigned long *flags)
660 {
661 info->options_len = len;
662 if (len > 0) {
663 memcpy(ip_tunnel_info_opts(info), from, len);
664 ip_tunnel_flags_or(info->key.tun_flags, info->key.tun_flags,
665 flags);
666 }
667 }
668
lwt_tun_info(struct lwtunnel_state * lwtstate)669 static inline struct ip_tunnel_info *lwt_tun_info(struct lwtunnel_state *lwtstate)
670 {
671 return (struct ip_tunnel_info *)lwtstate->data;
672 }
673
674 DECLARE_STATIC_KEY_FALSE(ip_tunnel_metadata_cnt);
675
676 /* Returns > 0 if metadata should be collected */
ip_tunnel_collect_metadata(void)677 static inline int ip_tunnel_collect_metadata(void)
678 {
679 return static_branch_unlikely(&ip_tunnel_metadata_cnt);
680 }
681
682 void __init ip_tunnel_core_init(void);
683
684 void ip_tunnel_need_metadata(void);
685 void ip_tunnel_unneed_metadata(void);
686
687 #else /* CONFIG_INET */
688
lwt_tun_info(struct lwtunnel_state * lwtstate)689 static inline struct ip_tunnel_info *lwt_tun_info(struct lwtunnel_state *lwtstate)
690 {
691 return NULL;
692 }
693
ip_tunnel_need_metadata(void)694 static inline void ip_tunnel_need_metadata(void)
695 {
696 }
697
ip_tunnel_unneed_metadata(void)698 static inline void ip_tunnel_unneed_metadata(void)
699 {
700 }
701
ip_tunnel_info_opts_get(void * to,const struct ip_tunnel_info * info)702 static inline void ip_tunnel_info_opts_get(void *to,
703 const struct ip_tunnel_info *info)
704 {
705 }
706
ip_tunnel_info_opts_set(struct ip_tunnel_info * info,const void * from,int len,const unsigned long * flags)707 static inline void ip_tunnel_info_opts_set(struct ip_tunnel_info *info,
708 const void *from, int len,
709 const unsigned long *flags)
710 {
711 info->options_len = 0;
712 }
713
714 #endif /* CONFIG_INET */
715
716 #endif /* __NET_IP_TUNNELS_H */
717