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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/flow.h>
15#include <net/gro_cells.h>
16#include <net/inet_dscp.h>
17#include <net/inet_ecn.h>
18#include <net/netns/generic.h>
19#include <net/rtnetlink.h>
20#include <net/lwtunnel.h>
21#include <net/dst_cache.h>
22#include <net/netdev_lock.h>
23
24#if IS_ENABLED(CONFIG_IPV6)
25#include <net/ipv6.h>
26#include <net/ip6_fib.h>
27#include <net/ip6_route.h>
28#endif
29
30/* Recursion limit for tunnel xmit to detect routing loops.
31 * Unlike XMIT_RECURSION_LIMIT (8) used in the no-qdisc path, tunnel
32 * recursion involves route lookups and full IP output, consuming much
33 * more stack per level, so a lower limit is needed.
34 */
35#define IP_TUNNEL_RECURSION_LIMIT 5
36
37/* Keep error state on tunnel for 30 sec */
38#define IPTUNNEL_ERR_TIMEO (30*HZ)
39
40/* Used to memset ip_tunnel padding. */
41#define IP_TUNNEL_KEY_SIZE offsetofend(struct ip_tunnel_key, tp_dst)
42
43/* Used to memset ipv4 address padding. */
44#define IP_TUNNEL_KEY_IPV4_PAD offsetofend(struct ip_tunnel_key, u.ipv4.dst)
45#define IP_TUNNEL_KEY_IPV4_PAD_LEN \
46 (sizeof_field(struct ip_tunnel_key, u) - \
47 sizeof_field(struct ip_tunnel_key, u.ipv4))
48
49#define __ipt_flag_op(op, ...) \
50 op(__VA_ARGS__, __IP_TUNNEL_FLAG_NUM)
51
52#define IP_TUNNEL_DECLARE_FLAGS(...) \
53 __ipt_flag_op(DECLARE_BITMAP, __VA_ARGS__)
54
55#define ip_tunnel_flags_zero(...) __ipt_flag_op(bitmap_zero, __VA_ARGS__)
56#define ip_tunnel_flags_copy(...) __ipt_flag_op(bitmap_copy, __VA_ARGS__)
57#define ip_tunnel_flags_and(...) __ipt_flag_op(bitmap_and, __VA_ARGS__)
58#define ip_tunnel_flags_or(...) __ipt_flag_op(bitmap_or, __VA_ARGS__)
59
60#define ip_tunnel_flags_empty(...) \
61 __ipt_flag_op(bitmap_empty, __VA_ARGS__)
62#define ip_tunnel_flags_intersect(...) \
63 __ipt_flag_op(bitmap_intersects, __VA_ARGS__)
64#define ip_tunnel_flags_subset(...) \
65 __ipt_flag_op(bitmap_subset, __VA_ARGS__)
66
67struct ip_tunnel_key {
68 __be64 tun_id;
69 union {
70 struct {
71 __be32 src;
72 __be32 dst;
73 } ipv4;
74 struct {
75 struct in6_addr src;
76 struct in6_addr dst;
77 } ipv6;
78 } u;
79 IP_TUNNEL_DECLARE_FLAGS(tun_flags);
80 __be32 label; /* Flow Label for IPv6 */
81 u32 nhid;
82 u8 tos; /* TOS for IPv4, TC for IPv6 */
83 u8 ttl; /* TTL for IPv4, HL for IPv6 */
84 __be16 tp_src;
85 __be16 tp_dst;
86 __u8 flow_flags;
87};
88
89struct ip_tunnel_encap {
90 u16 type;
91 u16 flags;
92 __be16 sport;
93 __be16 dport;
94};
95
96/* Flags for ip_tunnel_info mode. */
97#define IP_TUNNEL_INFO_TX 0x01 /* represents tx tunnel parameters */
98#define IP_TUNNEL_INFO_IPV6 0x02 /* key contains IPv6 addresses */
99#define IP_TUNNEL_INFO_BRIDGE 0x04 /* represents a bridged tunnel id */
100
101/* Maximum tunnel options length. */
102#define IP_TUNNEL_OPTS_MAX \
103 GENMASK((sizeof_field(struct ip_tunnel_info, \
104 options_len) * BITS_PER_BYTE) - 1, 0)
105
106#define ip_tunnel_info_opts(info) \
107 _Generic(info, \
108 const struct ip_tunnel_info * : ((const void *)(info)->options),\
109 struct ip_tunnel_info * : ((void *)(info)->options)\
110 )
111
112struct ip_tunnel_info {
113 struct ip_tunnel_key key;
114 struct ip_tunnel_encap encap;
115#ifdef CONFIG_DST_CACHE
116 struct dst_cache dst_cache;
117#endif
118 u8 options_len;
119 u8 mode;
120 u8 options[] __aligned_largest __counted_by(options_len);
121};
122
123/* 6rd prefix/relay information */
124#ifdef CONFIG_IPV6_SIT_6RD
125struct ip_tunnel_6rd_parm {
126 struct in6_addr prefix;
127 __be32 relay_prefix;
128 u16 prefixlen;
129 u16 relay_prefixlen;
130};
131#endif
132
133struct ip_tunnel_prl_entry {
134 struct ip_tunnel_prl_entry __rcu *next;
135 __be32 addr;
136 u16 flags;
137 struct rcu_head rcu_head;
138};
139
140struct metadata_dst;
141
142/* Kernel-side variant of ip_tunnel_parm */
143struct ip_tunnel_parm_kern {
144 char name[IFNAMSIZ];
145 IP_TUNNEL_DECLARE_FLAGS(i_flags);
146 IP_TUNNEL_DECLARE_FLAGS(o_flags);
147 __be32 i_key;
148 __be32 o_key;
149 int link;
150 struct iphdr iph;
151};
152
153struct ip_tunnel {
154 struct ip_tunnel __rcu *next;
155 struct hlist_node hash_node;
156
157 struct net_device *dev;
158 netdevice_tracker dev_tracker;
159
160 struct net *net; /* netns for packet i/o */
161
162 unsigned long err_time; /* Time when the last ICMP error
163 * arrived */
164 int err_count; /* Number of arrived ICMP errors */
165
166 /* These four fields used only by GRE */
167 u32 i_seqno; /* The last seen seqno */
168 atomic_t o_seqno; /* The last output seqno */
169 int tun_hlen; /* Precalculated header length */
170
171 /* These four fields used only by ERSPAN */
172 u32 index; /* ERSPAN type II index */
173 u8 erspan_ver; /* ERSPAN version */
174 u8 dir; /* ERSPAN direction */
175 u16 hwid; /* ERSPAN hardware ID */
176
177 struct dst_cache dst_cache;
178
179 struct ip_tunnel_parm_kern parms;
180
181 int mlink;
182 int encap_hlen; /* Encap header length (FOU,GUE) */
183 int hlen; /* tun_hlen + encap_hlen */
184 struct ip_tunnel_encap encap;
185
186 /* for SIT */
187#ifdef CONFIG_IPV6_SIT_6RD
188 struct ip_tunnel_6rd_parm ip6rd;
189#endif
190 struct ip_tunnel_prl_entry __rcu *prl; /* potential router list */
191 unsigned int prl_count; /* # of entries in PRL */
192 unsigned int ip_tnl_net_id;
193 struct gro_cells gro_cells;
194 __u32 fwmark;
195 bool collect_md;
196 bool ignore_df;
197};
198
199struct tnl_ptk_info {
200 IP_TUNNEL_DECLARE_FLAGS(flags);
201 __be16 proto;
202 __be32 key;
203 __be32 seq;
204 int hdr_len;
205};
206
207#define PACKET_RCVD 0
208#define PACKET_REJECT 1
209#define PACKET_NEXT 2
210
211#define IP_TNL_HASH_BITS 7
212#define IP_TNL_HASH_SIZE (1 << IP_TNL_HASH_BITS)
213
214struct ip_tunnel_net {
215 struct net_device *fb_tunnel_dev;
216 struct rtnl_link_ops *rtnl_link_ops;
217 struct hlist_head tunnels[IP_TNL_HASH_SIZE];
218 struct ip_tunnel __rcu *collect_md_tun;
219 int type;
220};
221
222static inline void ip_tunnel_set_options_present(unsigned long *flags)
223{
224 IP_TUNNEL_DECLARE_FLAGS(present) = { };
225
226 __set_bit(IP_TUNNEL_GENEVE_OPT_BIT, present);
227 __set_bit(IP_TUNNEL_VXLAN_OPT_BIT, present);
228 __set_bit(IP_TUNNEL_ERSPAN_OPT_BIT, present);
229 __set_bit(IP_TUNNEL_GTP_OPT_BIT, present);
230 __set_bit(IP_TUNNEL_PFCP_OPT_BIT, present);
231
232 ip_tunnel_flags_or(flags, flags, present);
233}
234
235static inline void ip_tunnel_clear_options_present(unsigned long *flags)
236{
237 IP_TUNNEL_DECLARE_FLAGS(present) = { };
238
239 __set_bit(IP_TUNNEL_GENEVE_OPT_BIT, present);
240 __set_bit(IP_TUNNEL_VXLAN_OPT_BIT, present);
241 __set_bit(IP_TUNNEL_ERSPAN_OPT_BIT, present);
242 __set_bit(IP_TUNNEL_GTP_OPT_BIT, present);
243 __set_bit(IP_TUNNEL_PFCP_OPT_BIT, present);
244
245 __ipt_flag_op(bitmap_andnot, flags, flags, present);
246}
247
248static inline bool ip_tunnel_is_options_present(const unsigned long *flags)
249{
250 IP_TUNNEL_DECLARE_FLAGS(present) = { };
251
252 __set_bit(IP_TUNNEL_GENEVE_OPT_BIT, present);
253 __set_bit(IP_TUNNEL_VXLAN_OPT_BIT, present);
254 __set_bit(IP_TUNNEL_ERSPAN_OPT_BIT, present);
255 __set_bit(IP_TUNNEL_GTP_OPT_BIT, present);
256 __set_bit(IP_TUNNEL_PFCP_OPT_BIT, present);
257
258 return ip_tunnel_flags_intersect(flags, present);
259}
260
261static inline bool ip_tunnel_flags_is_be16_compat(const unsigned long *flags)
262{
263 IP_TUNNEL_DECLARE_FLAGS(supp) = { };
264
265 bitmap_set(supp, 0, BITS_PER_TYPE(__be16));
266 __set_bit(IP_TUNNEL_VTI_BIT, supp);
267
268 return ip_tunnel_flags_subset(flags, supp);
269}
270
271static inline void ip_tunnel_flags_from_be16(unsigned long *dst, __be16 flags)
272{
273 ip_tunnel_flags_zero(dst);
274
275 bitmap_write(dst, be16_to_cpu(flags), 0, BITS_PER_TYPE(__be16));
276 __assign_bit(IP_TUNNEL_VTI_BIT, dst, flags & VTI_ISVTI);
277}
278
279static inline __be16 ip_tunnel_flags_to_be16(const unsigned long *flags)
280{
281 __be16 ret;
282
283 ret = cpu_to_be16(bitmap_read(flags, 0, BITS_PER_TYPE(__be16)));
284 if (test_bit(IP_TUNNEL_VTI_BIT, flags))
285 ret |= VTI_ISVTI;
286
287 return ret;
288}
289
290static inline void ip_tunnel_key_init(struct ip_tunnel_key *key,
291 __be32 saddr, __be32 daddr,
292 u8 tos, u8 ttl, __be32 label,
293 __be16 tp_src, __be16 tp_dst,
294 __be64 tun_id,
295 const unsigned long *tun_flags)
296{
297 key->tun_id = tun_id;
298 key->u.ipv4.src = saddr;
299 key->u.ipv4.dst = daddr;
300 memset((unsigned char *)key + IP_TUNNEL_KEY_IPV4_PAD,
301 0, IP_TUNNEL_KEY_IPV4_PAD_LEN);
302 key->tos = tos;
303 key->ttl = ttl;
304 key->label = label;
305 ip_tunnel_flags_copy(key->tun_flags, tun_flags);
306
307 /* For the tunnel types on the top of IPsec, the tp_src and tp_dst of
308 * the upper tunnel are used.
309 * E.g: GRE over IPSEC, the tp_src and tp_port are zero.
310 */
311 key->tp_src = tp_src;
312 key->tp_dst = tp_dst;
313
314 /* Clear struct padding. */
315 if (sizeof(*key) != IP_TUNNEL_KEY_SIZE)
316 memset((unsigned char *)key + IP_TUNNEL_KEY_SIZE,
317 0, sizeof(*key) - IP_TUNNEL_KEY_SIZE);
318}
319
320static inline bool
321ip_tunnel_dst_cache_usable(const struct sk_buff *skb,
322 const struct ip_tunnel_info *info)
323{
324 if (skb->mark)
325 return false;
326
327 return !info || !test_bit(IP_TUNNEL_NOCACHE_BIT, info->key.tun_flags);
328}
329
330static inline unsigned short ip_tunnel_info_af(const struct ip_tunnel_info
331 *tun_info)
332{
333 return tun_info->mode & IP_TUNNEL_INFO_IPV6 ? AF_INET6 : AF_INET;
334}
335
336static inline __be64 key32_to_tunnel_id(__be32 key)
337{
338#ifdef __BIG_ENDIAN
339 return (__force __be64)key;
340#else
341 return (__force __be64)((__force u64)key << 32);
342#endif
343}
344
345/* Returns the least-significant 32 bits of a __be64. */
346static inline __be32 tunnel_id_to_key32(__be64 tun_id)
347{
348#ifdef __BIG_ENDIAN
349 return (__force __be32)tun_id;
350#else
351 return (__force __be32)((__force u64)tun_id >> 32);
352#endif
353}
354
355#ifdef CONFIG_INET
356
357static inline void ip_tunnel_init_flow(struct flowi4 *fl4,
358 int proto,
359 __be32 daddr, __be32 saddr,
360 __be32 key, __u8 tos,
361 struct net *net, int oif,
362 __u32 mark, __u32 tun_inner_hash,
363 __u8 flow_flags)
364{
365 memset(fl4, 0, sizeof(*fl4));
366
367 if (oif) {
368 fl4->flowi4_l3mdev = l3mdev_master_upper_ifindex_by_index(net, oif);
369 /* Legacy VRF/l3mdev use case */
370 fl4->flowi4_oif = fl4->flowi4_l3mdev ? 0 : oif;
371 }
372
373 fl4->daddr = daddr;
374 fl4->saddr = saddr;
375 fl4->flowi4_dscp = inet_dsfield_to_dscp(tos);
376 fl4->flowi4_proto = proto;
377 fl4->fl4_gre_key = key;
378 fl4->flowi4_mark = mark;
379 fl4->flowi4_multipath_hash = tun_inner_hash;
380 fl4->flowi4_flags = flow_flags;
381}
382
383int __ip_tunnel_init(struct net_device *dev);
384#define ip_tunnel_init(DEV) \
385({ \
386 struct net_device *__dev = (DEV); \
387 int __res = __ip_tunnel_init(__dev); \
388 \
389 if (!__res) \
390 netdev_lockdep_set_classes(__dev);\
391 __res; \
392})
393
394void ip_tunnel_uninit(struct net_device *dev);
395void ip_tunnel_dellink(struct net_device *dev, struct list_head *head);
396struct net *ip_tunnel_get_link_net(const struct net_device *dev);
397int ip_tunnel_get_iflink(const struct net_device *dev);
398int ip_tunnel_init_net(struct net *net, unsigned int ip_tnl_net_id,
399 struct rtnl_link_ops *ops, char *devname);
400void ip_tunnel_delete_net(struct net *net, unsigned int id,
401 struct rtnl_link_ops *ops,
402 struct list_head *dev_to_kill);
403
404void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev,
405 const struct iphdr *tnl_params, const u8 protocol);
406void ip_md_tunnel_xmit(struct sk_buff *skb, struct net_device *dev,
407 const u8 proto, int tunnel_hlen);
408int ip_tunnel_ctl(struct net_device *dev, struct ip_tunnel_parm_kern *p,
409 int cmd);
410bool ip_tunnel_parm_from_user(struct ip_tunnel_parm_kern *kp,
411 const void __user *data);
412bool ip_tunnel_parm_to_user(void __user *data, struct ip_tunnel_parm_kern *kp);
413int ip_tunnel_siocdevprivate(struct net_device *dev, struct ifreq *ifr,
414 void __user *data, int cmd);
415int ip_tunnel_change_mtu(struct net_device *dev, int new_mtu);
416
417struct ip_tunnel *ip_tunnel_lookup(struct ip_tunnel_net *itn,
418 int link, const unsigned long *flags,
419 __be32 remote, __be32 local,
420 __be32 key);
421
422void ip_tunnel_md_udp_encap(struct sk_buff *skb, struct ip_tunnel_info *info);
423int ip_tunnel_rcv(struct ip_tunnel *tunnel, struct sk_buff *skb,
424 const struct tnl_ptk_info *tpi, struct metadata_dst *tun_dst,
425 bool log_ecn_error);
426int ip_tunnel_changelink(struct net_device *dev, struct nlattr *tb[],
427 struct ip_tunnel_parm_kern *p, __u32 fwmark);
428int ip_tunnel_newlink(struct net *net, struct net_device *dev,
429 struct nlattr *tb[], struct ip_tunnel_parm_kern *p,
430 __u32 fwmark);
431void ip_tunnel_setup(struct net_device *dev, unsigned int net_id);
432
433bool ip_tunnel_netlink_encap_parms(struct nlattr *data[],
434 struct ip_tunnel_encap *encap);
435
436void ip_tunnel_netlink_parms(struct nlattr *data[],
437 struct ip_tunnel_parm_kern *parms);
438
439extern const struct header_ops ip_tunnel_header_ops;
440__be16 ip_tunnel_parse_protocol(const struct sk_buff *skb);
441
442struct ip_tunnel_encap_ops {
443 size_t (*encap_hlen)(struct ip_tunnel_encap *e);
444 int (*build_header)(struct sk_buff *skb, struct ip_tunnel_encap *e,
445 u8 *protocol, struct flowi4 *fl4);
446 int (*err_handler)(struct sk_buff *skb, u32 info);
447};
448
449#define MAX_IPTUN_ENCAP_OPS 8
450
451extern const struct ip_tunnel_encap_ops __rcu *
452 iptun_encaps[MAX_IPTUN_ENCAP_OPS];
453
454int ip_tunnel_encap_add_ops(const struct ip_tunnel_encap_ops *op,
455 unsigned int num);
456int ip_tunnel_encap_del_ops(const struct ip_tunnel_encap_ops *op,
457 unsigned int num);
458
459int ip_tunnel_encap_setup(struct ip_tunnel *t,
460 struct ip_tunnel_encap *ipencap);
461
462static inline enum skb_drop_reason
463pskb_inet_may_pull_reason(struct sk_buff *skb)
464{
465 int nhlen;
466
467 switch (skb->protocol) {
468#if IS_ENABLED(CONFIG_IPV6)
469 case htons(ETH_P_IPV6):
470 nhlen = sizeof(struct ipv6hdr);
471 break;
472#endif
473 case htons(ETH_P_IP):
474 nhlen = sizeof(struct iphdr);
475 break;
476 default:
477 nhlen = 0;
478 }
479
480 return pskb_network_may_pull_reason(skb, nhlen);
481}
482
483static inline bool pskb_inet_may_pull(struct sk_buff *skb)
484{
485 return pskb_inet_may_pull_reason(skb) == SKB_NOT_DROPPED_YET;
486}
487
488/* Variant of pskb_inet_may_pull().
489 */
490static inline enum skb_drop_reason
491skb_vlan_inet_prepare(struct sk_buff *skb, bool inner_proto_inherit)
492{
493 int nhlen = 0, maclen = inner_proto_inherit ? 0 : ETH_HLEN;
494 __be16 type = skb->protocol;
495 enum skb_drop_reason reason;
496
497 /* Essentially this is skb_protocol(skb, true)
498 * And we get MAC len.
499 */
500 if (eth_type_vlan(type))
501 type = __vlan_get_protocol(skb, type, &maclen);
502
503 switch (type) {
504#if IS_ENABLED(CONFIG_IPV6)
505 case htons(ETH_P_IPV6):
506 nhlen = sizeof(struct ipv6hdr);
507 break;
508#endif
509 case htons(ETH_P_IP):
510 nhlen = sizeof(struct iphdr);
511 break;
512 }
513 /* For ETH_P_IPV6/ETH_P_IP we make sure to pull
514 * a base network header in skb->head.
515 */
516 reason = pskb_may_pull_reason(skb, maclen + nhlen);
517 if (reason)
518 return reason;
519
520 skb_set_network_header(skb, maclen);
521
522 return SKB_NOT_DROPPED_YET;
523}
524
525static inline int ip_encap_hlen(struct ip_tunnel_encap *e)
526{
527 const struct ip_tunnel_encap_ops *ops;
528 int hlen = -EINVAL;
529
530 if (e->type == TUNNEL_ENCAP_NONE)
531 return 0;
532
533 if (e->type >= MAX_IPTUN_ENCAP_OPS)
534 return -EINVAL;
535
536 rcu_read_lock();
537 ops = rcu_dereference(iptun_encaps[e->type]);
538 if (likely(ops && ops->encap_hlen))
539 hlen = ops->encap_hlen(e);
540 rcu_read_unlock();
541
542 return hlen;
543}
544
545static inline int ip_tunnel_encap(struct sk_buff *skb,
546 struct ip_tunnel_encap *e,
547 u8 *protocol, struct flowi4 *fl4)
548{
549 const struct ip_tunnel_encap_ops *ops;
550 int ret = -EINVAL;
551
552 if (e->type == TUNNEL_ENCAP_NONE)
553 return 0;
554
555 if (e->type >= MAX_IPTUN_ENCAP_OPS)
556 return -EINVAL;
557
558 rcu_read_lock();
559 ops = rcu_dereference(iptun_encaps[e->type]);
560 if (likely(ops && ops->build_header))
561 ret = ops->build_header(skb, e, protocol, fl4);
562 rcu_read_unlock();
563
564 return ret;
565}
566
567/* Extract dsfield from inner protocol */
568static inline u8 ip_tunnel_get_dsfield(const struct iphdr *iph,
569 const struct sk_buff *skb)
570{
571 __be16 payload_protocol = skb_protocol(skb, true);
572
573 if (payload_protocol == htons(ETH_P_IP))
574 return iph->tos;
575 else if (payload_protocol == htons(ETH_P_IPV6))
576 return ipv6_get_dsfield((const struct ipv6hdr *)iph);
577 else
578 return 0;
579}
580
581static inline __be32 ip_tunnel_get_flowlabel(const struct iphdr *iph,
582 const struct sk_buff *skb)
583{
584 __be16 payload_protocol = skb_protocol(skb, true);
585
586 if (payload_protocol == htons(ETH_P_IPV6))
587 return ip6_flowlabel((const struct ipv6hdr *)iph);
588 else
589 return 0;
590}
591
592static inline u8 ip_tunnel_get_ttl(const struct iphdr *iph,
593 const struct sk_buff *skb)
594{
595 __be16 payload_protocol = skb_protocol(skb, true);
596
597 if (payload_protocol == htons(ETH_P_IP))
598 return iph->ttl;
599 else if (payload_protocol == htons(ETH_P_IPV6))
600 return ((const struct ipv6hdr *)iph)->hop_limit;
601 else
602 return 0;
603}
604
605/* Propagate ECN bits out */
606static inline u8 ip_tunnel_ecn_encap(u8 tos, const struct iphdr *iph,
607 const struct sk_buff *skb)
608{
609 u8 inner = ip_tunnel_get_dsfield(iph, skb);
610
611 return INET_ECN_encapsulate(tos, inner);
612}
613
614int __iptunnel_pull_header(struct sk_buff *skb, int hdr_len,
615 __be16 inner_proto, bool raw_proto, bool xnet);
616
617static inline int iptunnel_pull_header(struct sk_buff *skb, int hdr_len,
618 __be16 inner_proto, bool xnet)
619{
620 return __iptunnel_pull_header(skb, hdr_len, inner_proto, false, xnet);
621}
622
623void iptunnel_xmit(struct sock *sk, struct rtable *rt, struct sk_buff *skb,
624 __be32 src, __be32 dst, u8 proto,
625 u8 tos, u8 ttl, __be16 df, bool xnet, u16 ipcb_flags);
626struct metadata_dst *iptunnel_metadata_reply(struct metadata_dst *md,
627 gfp_t flags);
628int skb_tunnel_check_pmtu(struct sk_buff *skb, struct dst_entry *encap_dst,
629 int headroom, bool reply);
630
631static inline unsigned int ip_tunnel_limit_headroom(unsigned int headroom)
632{
633 /* we must cap headroom to some upperlimit, else pskb_expand_head
634 * will overflow header offsets in skb_headers_offset_update().
635 */
636 const unsigned int max_allowed = 512;
637
638 if (headroom > max_allowed)
639 headroom = max_allowed;
640
641 return headroom;
642}
643
644static inline void ip_tunnel_adj_headroom(struct net_device *dev,
645 unsigned int headroom)
646{
647 headroom = ip_tunnel_limit_headroom(headroom);
648
649 if (headroom > READ_ONCE(dev->needed_headroom))
650 WRITE_ONCE(dev->needed_headroom, headroom);
651}
652
653int iptunnel_handle_offloads(struct sk_buff *skb, int gso_type_mask);
654
655static inline int iptunnel_pull_offloads(struct sk_buff *skb)
656{
657 if (skb_is_gso(skb)) {
658 int err;
659
660 err = skb_unclone(skb, GFP_ATOMIC);
661 if (unlikely(err))
662 return err;
663 skb_shinfo(skb)->gso_type &= ~(NETIF_F_GSO_ENCAP_ALL >>
664 NETIF_F_GSO_SHIFT);
665 }
666
667 skb->encapsulation = 0;
668 return 0;
669}
670
671static inline void iptunnel_xmit_stats(struct net_device *dev, int pkt_len)
672{
673 if (pkt_len > 0) {
674 if (dev->pcpu_stat_type == NETDEV_PCPU_STAT_DSTATS) {
675 struct pcpu_dstats *dstats = get_cpu_ptr(dev->dstats);
676
677 u64_stats_update_begin(&dstats->syncp);
678 u64_stats_add(&dstats->tx_bytes, pkt_len);
679 u64_stats_inc(&dstats->tx_packets);
680 u64_stats_update_end(&dstats->syncp);
681 put_cpu_ptr(dstats);
682 return;
683 }
684 if (dev->pcpu_stat_type == NETDEV_PCPU_STAT_TSTATS) {
685 struct pcpu_sw_netstats *tstats = get_cpu_ptr(dev->tstats);
686
687 u64_stats_update_begin(&tstats->syncp);
688 u64_stats_add(&tstats->tx_bytes, pkt_len);
689 u64_stats_inc(&tstats->tx_packets);
690 u64_stats_update_end(&tstats->syncp);
691 put_cpu_ptr(tstats);
692 return;
693 }
694 pr_err_once("iptunnel_xmit_stats pcpu_stat_type=%d\n",
695 dev->pcpu_stat_type);
696 WARN_ON_ONCE(1);
697 return;
698 }
699
700 if (pkt_len < 0) {
701 DEV_STATS_INC(dev, tx_errors);
702 DEV_STATS_INC(dev, tx_aborted_errors);
703 } else {
704 DEV_STATS_INC(dev, tx_dropped);
705 }
706}
707
708static inline void ip_tunnel_info_opts_get(void *to,
709 const struct ip_tunnel_info *info)
710{
711 memcpy(to, ip_tunnel_info_opts(info), info->options_len);
712}
713
714static inline void ip_tunnel_info_opts_set(struct ip_tunnel_info *info,
715 const void *from, int len,
716 const unsigned long *flags)
717{
718 info->options_len = len;
719 if (len > 0) {
720 memcpy(ip_tunnel_info_opts(info), from, len);
721 ip_tunnel_flags_or(info->key.tun_flags, info->key.tun_flags,
722 flags);
723 }
724}
725
726static inline struct ip_tunnel_info *lwt_tun_info(struct lwtunnel_state *lwtstate)
727{
728 return (struct ip_tunnel_info *)lwtstate->data;
729}
730
731DECLARE_STATIC_KEY_FALSE(ip_tunnel_metadata_cnt);
732
733/* Returns > 0 if metadata should be collected */
734static inline int ip_tunnel_collect_metadata(void)
735{
736 return static_branch_unlikely(&ip_tunnel_metadata_cnt);
737}
738
739void __init ip_tunnel_core_init(void);
740
741void ip_tunnel_need_metadata(void);
742void ip_tunnel_unneed_metadata(void);
743
744#else /* CONFIG_INET */
745
746static inline struct ip_tunnel_info *lwt_tun_info(struct lwtunnel_state *lwtstate)
747{
748 return NULL;
749}
750
751static inline void ip_tunnel_need_metadata(void)
752{
753}
754
755static inline void ip_tunnel_unneed_metadata(void)
756{
757}
758
759static inline void ip_tunnel_info_opts_get(void *to,
760 const struct ip_tunnel_info *info)
761{
762}
763
764static inline void ip_tunnel_info_opts_set(struct ip_tunnel_info *info,
765 const void *from, int len,
766 const unsigned long *flags)
767{
768 info->options_len = 0;
769}
770
771#endif /* CONFIG_INET */
772
773#endif /* __NET_IP_TUNNELS_H */