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