1
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
28#define IPTUNNEL_ERR_TIMEO (30*HZ)
29
30
31#define IP_TUNNEL_KEY_SIZE offsetofend(struct ip_tunnel_key, tp_dst)
32
33
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
39struct 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;
53 u8 ttl;
54 __be32 label;
55 __be16 tp_src;
56 __be16 tp_dst;
57};
58
59
60#define IP_TUNNEL_INFO_TX 0x01
61#define IP_TUNNEL_INFO_IPV6 0x02
62#define IP_TUNNEL_INFO_BRIDGE 0x04
63
64
65#define IP_TUNNEL_OPTS_MAX \
66 GENMASK((sizeof_field(struct ip_tunnel_info, \
67 options_len) * BITS_PER_BYTE) - 1, 0)
68
69struct 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
79#ifdef CONFIG_IPV6_SIT_6RD
80struct ip_tunnel_6rd_parm {
81 struct in6_addr prefix;
82 __be32 relay_prefix;
83 u16 prefixlen;
84 u16 relay_prefixlen;
85};
86#endif
87
88struct ip_tunnel_encap {
89 u16 type;
90 u16 flags;
91 __be16 sport;
92 __be16 dport;
93};
94
95struct 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
102struct metadata_dst;
103
104struct ip_tunnel {
105 struct ip_tunnel __rcu *next;
106 struct hlist_node hash_node;
107 struct net_device *dev;
108 struct net *net;
109
110 unsigned long err_time;
111
112 int err_count;
113
114
115 u32 i_seqno;
116 u32 o_seqno;
117 int tun_hlen;
118
119
120 u32 index;
121 u8 erspan_ver;
122 u8 dir;
123 u16 hwid;
124
125 struct dst_cache dst_cache;
126
127 struct ip_tunnel_parm parms;
128
129 int mlink;
130 int encap_hlen;
131 int hlen;
132 struct ip_tunnel_encap encap;
133
134
135#ifdef CONFIG_IPV6_SIT_6RD
136 struct ip_tunnel_6rd_parm ip6rd;
137#endif
138 struct ip_tunnel_prl_entry __rcu *prl;
139 unsigned int prl_count;
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
147struct tnl_ptk_info {
148 __be16 flags;
149 __be16 proto;
150 __be32 key;
151 __be32 seq;
152 int hdr_len;
153};
154
155#define PACKET_RCVD 0
156#define PACKET_REJECT 1
157#define PACKET_NEXT 2
158
159#define IP_TNL_HASH_BITS 7
160#define IP_TNL_HASH_SIZE (1 << IP_TNL_HASH_BITS)
161
162struct ip_tunnel_net {
163 struct net_device *fb_tunnel_dev;
164 struct rtnl_link_ops *rtnl_link_ops;
165 struct hlist_head tunnels[IP_TNL_HASH_SIZE];
166 struct ip_tunnel __rcu *collect_md_tun;
167 int type;
168};
169
170static inline void ip_tunnel_key_init(struct ip_tunnel_key *key,
171 __be32 saddr, __be32 daddr,
172 u8 tos, u8 ttl, __be32 label,
173 __be16 tp_src, __be16 tp_dst,
174 __be64 tun_id, __be16 tun_flags)
175{
176 key->tun_id = tun_id;
177 key->u.ipv4.src = saddr;
178 key->u.ipv4.dst = daddr;
179 memset((unsigned char *)key + IP_TUNNEL_KEY_IPV4_PAD,
180 0, IP_TUNNEL_KEY_IPV4_PAD_LEN);
181 key->tos = tos;
182 key->ttl = ttl;
183 key->label = label;
184 key->tun_flags = tun_flags;
185
186
187
188
189
190 key->tp_src = tp_src;
191 key->tp_dst = tp_dst;
192
193
194 if (sizeof(*key) != IP_TUNNEL_KEY_SIZE)
195 memset((unsigned char *)key + IP_TUNNEL_KEY_SIZE,
196 0, sizeof(*key) - IP_TUNNEL_KEY_SIZE);
197}
198
199static inline bool
200ip_tunnel_dst_cache_usable(const struct sk_buff *skb,
201 const struct ip_tunnel_info *info)
202{
203 if (skb->mark)
204 return false;
205 if (!info)
206 return true;
207 if (info->key.tun_flags & TUNNEL_NOCACHE)
208 return false;
209
210 return true;
211}
212
213static inline unsigned short ip_tunnel_info_af(const struct ip_tunnel_info
214 *tun_info)
215{
216 return tun_info->mode & IP_TUNNEL_INFO_IPV6 ? AF_INET6 : AF_INET;
217}
218
219static inline __be64 key32_to_tunnel_id(__be32 key)
220{
221#ifdef __BIG_ENDIAN
222 return (__force __be64)key;
223#else
224 return (__force __be64)((__force u64)key << 32);
225#endif
226}
227
228
229static inline __be32 tunnel_id_to_key32(__be64 tun_id)
230{
231#ifdef __BIG_ENDIAN
232 return (__force __be32)tun_id;
233#else
234 return (__force __be32)((__force u64)tun_id >> 32);
235#endif
236}
237
238#ifdef CONFIG_INET
239
240static inline void ip_tunnel_init_flow(struct flowi4 *fl4,
241 int proto,
242 __be32 daddr, __be32 saddr,
243 __be32 key, __u8 tos, int oif,
244 __u32 mark, __u32 tun_inner_hash)
245{
246 memset(fl4, 0, sizeof(*fl4));
247 fl4->flowi4_oif = oif;
248 fl4->daddr = daddr;
249 fl4->saddr = saddr;
250 fl4->flowi4_tos = tos;
251 fl4->flowi4_proto = proto;
252 fl4->fl4_gre_key = key;
253 fl4->flowi4_mark = mark;
254 fl4->flowi4_multipath_hash = tun_inner_hash;
255}
256
257int ip_tunnel_init(struct net_device *dev);
258void ip_tunnel_uninit(struct net_device *dev);
259void ip_tunnel_dellink(struct net_device *dev, struct list_head *head);
260struct net *ip_tunnel_get_link_net(const struct net_device *dev);
261int ip_tunnel_get_iflink(const struct net_device *dev);
262int ip_tunnel_init_net(struct net *net, unsigned int ip_tnl_net_id,
263 struct rtnl_link_ops *ops, char *devname);
264
265void ip_tunnel_delete_nets(struct list_head *list_net, unsigned int id,
266 struct rtnl_link_ops *ops);
267
268void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev,
269 const struct iphdr *tnl_params, const u8 protocol);
270void ip_md_tunnel_xmit(struct sk_buff *skb, struct net_device *dev,
271 const u8 proto, int tunnel_hlen);
272int ip_tunnel_ctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd);
273int ip_tunnel_siocdevprivate(struct net_device *dev, struct ifreq *ifr,
274 void __user *data, int cmd);
275int __ip_tunnel_change_mtu(struct net_device *dev, int new_mtu, bool strict);
276int ip_tunnel_change_mtu(struct net_device *dev, int new_mtu);
277
278struct ip_tunnel *ip_tunnel_lookup(struct ip_tunnel_net *itn,
279 int link, __be16 flags,
280 __be32 remote, __be32 local,
281 __be32 key);
282
283int 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);
286int ip_tunnel_changelink(struct net_device *dev, struct nlattr *tb[],
287 struct ip_tunnel_parm *p, __u32 fwmark);
288int ip_tunnel_newlink(struct net_device *dev, struct nlattr *tb[],
289 struct ip_tunnel_parm *p, __u32 fwmark);
290void ip_tunnel_setup(struct net_device *dev, unsigned int net_id);
291
292extern const struct header_ops ip_tunnel_header_ops;
293__be16 ip_tunnel_parse_protocol(const struct sk_buff *skb);
294
295struct ip_tunnel_encap_ops {
296 size_t (*encap_hlen)(struct ip_tunnel_encap *e);
297 int (*build_header)(struct sk_buff *skb, struct ip_tunnel_encap *e,
298 u8 *protocol, struct flowi4 *fl4);
299 int (*err_handler)(struct sk_buff *skb, u32 info);
300};
301
302#define MAX_IPTUN_ENCAP_OPS 8
303
304extern const struct ip_tunnel_encap_ops __rcu *
305 iptun_encaps[MAX_IPTUN_ENCAP_OPS];
306
307int ip_tunnel_encap_add_ops(const struct ip_tunnel_encap_ops *op,
308 unsigned int num);
309int ip_tunnel_encap_del_ops(const struct ip_tunnel_encap_ops *op,
310 unsigned int num);
311
312int ip_tunnel_encap_setup(struct ip_tunnel *t,
313 struct ip_tunnel_encap *ipencap);
314
315static inline bool pskb_inet_may_pull(struct sk_buff *skb)
316{
317 int nhlen;
318
319 switch (skb->protocol) {
320#if IS_ENABLED(CONFIG_IPV6)
321 case htons(ETH_P_IPV6):
322 nhlen = sizeof(struct ipv6hdr);
323 break;
324#endif
325 case htons(ETH_P_IP):
326 nhlen = sizeof(struct iphdr);
327 break;
328 default:
329 nhlen = 0;
330 }
331
332 return pskb_network_may_pull(skb, nhlen);
333}
334
335static inline int ip_encap_hlen(struct ip_tunnel_encap *e)
336{
337 const struct ip_tunnel_encap_ops *ops;
338 int hlen = -EINVAL;
339
340 if (e->type == TUNNEL_ENCAP_NONE)
341 return 0;
342
343 if (e->type >= MAX_IPTUN_ENCAP_OPS)
344 return -EINVAL;
345
346 rcu_read_lock();
347 ops = rcu_dereference(iptun_encaps[e->type]);
348 if (likely(ops && ops->encap_hlen))
349 hlen = ops->encap_hlen(e);
350 rcu_read_unlock();
351
352 return hlen;
353}
354
355static inline int ip_tunnel_encap(struct sk_buff *skb, struct ip_tunnel *t,
356 u8 *protocol, struct flowi4 *fl4)
357{
358 const struct ip_tunnel_encap_ops *ops;
359 int ret = -EINVAL;
360
361 if (t->encap.type == TUNNEL_ENCAP_NONE)
362 return 0;
363
364 if (t->encap.type >= MAX_IPTUN_ENCAP_OPS)
365 return -EINVAL;
366
367 rcu_read_lock();
368 ops = rcu_dereference(iptun_encaps[t->encap.type]);
369 if (likely(ops && ops->build_header))
370 ret = ops->build_header(skb, &t->encap, protocol, fl4);
371 rcu_read_unlock();
372
373 return ret;
374}
375
376
377static inline u8 ip_tunnel_get_dsfield(const struct iphdr *iph,
378 const struct sk_buff *skb)
379{
380 if (skb->protocol == htons(ETH_P_IP))
381 return iph->tos;
382 else if (skb->protocol == htons(ETH_P_IPV6))
383 return ipv6_get_dsfield((const struct ipv6hdr *)iph);
384 else
385 return 0;
386}
387
388static inline u8 ip_tunnel_get_ttl(const struct iphdr *iph,
389 const struct sk_buff *skb)
390{
391 if (skb->protocol == htons(ETH_P_IP))
392 return iph->ttl;
393 else if (skb->protocol == htons(ETH_P_IPV6))
394 return ((const struct ipv6hdr *)iph)->hop_limit;
395 else
396 return 0;
397}
398
399
400static inline u8 ip_tunnel_ecn_encap(u8 tos, const struct iphdr *iph,
401 const struct sk_buff *skb)
402{
403 u8 inner = ip_tunnel_get_dsfield(iph, skb);
404
405 return INET_ECN_encapsulate(tos, inner);
406}
407
408int __iptunnel_pull_header(struct sk_buff *skb, int hdr_len,
409 __be16 inner_proto, bool raw_proto, bool xnet);
410
411static inline int iptunnel_pull_header(struct sk_buff *skb, int hdr_len,
412 __be16 inner_proto, bool xnet)
413{
414 return __iptunnel_pull_header(skb, hdr_len, inner_proto, false, xnet);
415}
416
417void iptunnel_xmit(struct sock *sk, struct rtable *rt, struct sk_buff *skb,
418 __be32 src, __be32 dst, u8 proto,
419 u8 tos, u8 ttl, __be16 df, bool xnet);
420struct metadata_dst *iptunnel_metadata_reply(struct metadata_dst *md,
421 gfp_t flags);
422int skb_tunnel_check_pmtu(struct sk_buff *skb, struct dst_entry *encap_dst,
423 int headroom, bool reply);
424
425int iptunnel_handle_offloads(struct sk_buff *skb, int gso_type_mask);
426
427static inline int iptunnel_pull_offloads(struct sk_buff *skb)
428{
429 if (skb_is_gso(skb)) {
430 int err;
431
432 err = skb_unclone(skb, GFP_ATOMIC);
433 if (unlikely(err))
434 return err;
435 skb_shinfo(skb)->gso_type &= ~(NETIF_F_GSO_ENCAP_ALL >>
436 NETIF_F_GSO_SHIFT);
437 }
438
439 skb->encapsulation = 0;
440 return 0;
441}
442
443static inline void iptunnel_xmit_stats(struct net_device *dev, int pkt_len)
444{
445 if (pkt_len > 0) {
446 struct pcpu_sw_netstats *tstats = get_cpu_ptr(dev->tstats);
447
448 u64_stats_update_begin(&tstats->syncp);
449 tstats->tx_bytes += pkt_len;
450 tstats->tx_packets++;
451 u64_stats_update_end(&tstats->syncp);
452 put_cpu_ptr(tstats);
453 } else {
454 struct net_device_stats *err_stats = &dev->stats;
455
456 if (pkt_len < 0) {
457 err_stats->tx_errors++;
458 err_stats->tx_aborted_errors++;
459 } else {
460 err_stats->tx_dropped++;
461 }
462 }
463}
464
465static inline void *ip_tunnel_info_opts(struct ip_tunnel_info *info)
466{
467 return info + 1;
468}
469
470static inline void ip_tunnel_info_opts_get(void *to,
471 const struct ip_tunnel_info *info)
472{
473 memcpy(to, info + 1, info->options_len);
474}
475
476static inline void ip_tunnel_info_opts_set(struct ip_tunnel_info *info,
477 const void *from, int len,
478 __be16 flags)
479{
480 info->options_len = len;
481 if (len > 0) {
482 memcpy(ip_tunnel_info_opts(info), from, len);
483 info->key.tun_flags |= flags;
484 }
485}
486
487static inline struct ip_tunnel_info *lwt_tun_info(struct lwtunnel_state *lwtstate)
488{
489 return (struct ip_tunnel_info *)lwtstate->data;
490}
491
492DECLARE_STATIC_KEY_FALSE(ip_tunnel_metadata_cnt);
493
494
495static inline int ip_tunnel_collect_metadata(void)
496{
497 return static_branch_unlikely(&ip_tunnel_metadata_cnt);
498}
499
500void __init ip_tunnel_core_init(void);
501
502void ip_tunnel_need_metadata(void);
503void ip_tunnel_unneed_metadata(void);
504
505#else
506
507static inline struct ip_tunnel_info *lwt_tun_info(struct lwtunnel_state *lwtstate)
508{
509 return NULL;
510}
511
512static inline void ip_tunnel_need_metadata(void)
513{
514}
515
516static inline void ip_tunnel_unneed_metadata(void)
517{
518}
519
520static inline void ip_tunnel_info_opts_get(void *to,
521 const struct ip_tunnel_info *info)
522{
523}
524
525static inline void ip_tunnel_info_opts_set(struct ip_tunnel_info *info,
526 const void *from, int len,
527 __be16 flags)
528{
529 info->options_len = 0;
530}
531
532#endif
533
534#endif
535