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dt-bindings: Document rk3399 rk-timer bindings
[linux/fpc-iii.git] / include / net / ip_tunnels.h
blobdbf4444284371ddd6527030d5c63103a2577c234
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 /* Keep error state on tunnel for 30 sec */
27 #define IPTUNNEL_ERR_TIMEO (30*HZ)
28
29 /* Used to memset ip_tunnel padding. */
30 #define IP_TUNNEL_KEY_SIZE offsetofend(struct ip_tunnel_key, tp_dst)
31
32 /* Used to memset ipv4 address padding. */
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
38 struct 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; /* TOS for IPv4, TC for IPv6 */
52 u8 ttl; /* TTL for IPv4, HL for IPv6 */
53 __be32 label; /* Flow Label for IPv6 */
54 __be16 tp_src;
55 __be16 tp_dst;
56 };
57
58 /* Flags for ip_tunnel_info mode. */
59 #define IP_TUNNEL_INFO_TX 0x01 /* represents tx tunnel parameters */
60 #define IP_TUNNEL_INFO_IPV6 0x02 /* key contains IPv6 addresses */
61
62 /* Maximum tunnel options length. */
63 #define IP_TUNNEL_OPTS_MAX \
64 GENMASK((FIELD_SIZEOF(struct ip_tunnel_info, \
65 options_len) * BITS_PER_BYTE) - 1, 0)
66
67 struct ip_tunnel_info {
68 struct ip_tunnel_key key;
69 #ifdef CONFIG_DST_CACHE
70 struct dst_cache dst_cache;
71 #endif
72 u8 options_len;
73 u8 mode;
74 };
75
76 /* 6rd prefix/relay information */
77 #ifdef CONFIG_IPV6_SIT_6RD
78 struct ip_tunnel_6rd_parm {
79 struct in6_addr prefix;
80 __be32 relay_prefix;
81 u16 prefixlen;
82 u16 relay_prefixlen;
83 };
84 #endif
85
86 struct ip_tunnel_encap {
87 u16 type;
88 u16 flags;
89 __be16 sport;
90 __be16 dport;
91 };
92
93 struct ip_tunnel_prl_entry {
94 struct ip_tunnel_prl_entry __rcu *next;
95 __be32 addr;
96 u16 flags;
97 struct rcu_head rcu_head;
98 };
99
100 struct metadata_dst;
101
102 struct ip_tunnel {
103 struct ip_tunnel __rcu *next;
104 struct hlist_node hash_node;
105 struct net_device *dev;
106 struct net *net; /* netns for packet i/o */
107
108 unsigned long err_time; /* Time when the last ICMP error
109 * arrived */
110 int err_count; /* Number of arrived ICMP errors */
111
112 /* These four fields used only by GRE */
113 u32 i_seqno; /* The last seen seqno */
114 u32 o_seqno; /* The last output seqno */
115 int tun_hlen; /* Precalculated header length */
116
117 struct dst_cache dst_cache;
118
119 struct ip_tunnel_parm parms;
120
121 int mlink;
122 int encap_hlen; /* Encap header length (FOU,GUE) */
123 int hlen; /* tun_hlen + encap_hlen */
124 struct ip_tunnel_encap encap;
125
126 /* for SIT */
127 #ifdef CONFIG_IPV6_SIT_6RD
128 struct ip_tunnel_6rd_parm ip6rd;
129 #endif
130 struct ip_tunnel_prl_entry __rcu *prl; /* potential router list */
131 unsigned int prl_count; /* # of entries in PRL */
132 int ip_tnl_net_id;
133 struct gro_cells gro_cells;
134 bool collect_md;
135 };
136
137 #define TUNNEL_CSUM __cpu_to_be16(0x01)
138 #define TUNNEL_ROUTING __cpu_to_be16(0x02)
139 #define TUNNEL_KEY __cpu_to_be16(0x04)
140 #define TUNNEL_SEQ __cpu_to_be16(0x08)
141 #define TUNNEL_STRICT __cpu_to_be16(0x10)
142 #define TUNNEL_REC __cpu_to_be16(0x20)
143 #define TUNNEL_VERSION __cpu_to_be16(0x40)
144 #define TUNNEL_NO_KEY __cpu_to_be16(0x80)
145 #define TUNNEL_DONT_FRAGMENT __cpu_to_be16(0x0100)
146 #define TUNNEL_OAM __cpu_to_be16(0x0200)
147 #define TUNNEL_CRIT_OPT __cpu_to_be16(0x0400)
148 #define TUNNEL_GENEVE_OPT __cpu_to_be16(0x0800)
149 #define TUNNEL_VXLAN_OPT __cpu_to_be16(0x1000)
150 #define TUNNEL_NOCACHE __cpu_to_be16(0x2000)
151
152 #define TUNNEL_OPTIONS_PRESENT (TUNNEL_GENEVE_OPT | TUNNEL_VXLAN_OPT)
153
154 struct tnl_ptk_info {
155 __be16 flags;
156 __be16 proto;
157 __be32 key;
158 __be32 seq;
159 };
160
161 #define PACKET_RCVD 0
162 #define PACKET_REJECT 1
163 #define PACKET_NEXT 2
164
165 #define IP_TNL_HASH_BITS 7
166 #define IP_TNL_HASH_SIZE (1 << IP_TNL_HASH_BITS)
167
168 struct ip_tunnel_net {
169 struct net_device *fb_tunnel_dev;
170 struct hlist_head tunnels[IP_TNL_HASH_SIZE];
171 struct ip_tunnel __rcu *collect_md_tun;
172 };
173
174 static inline void ip_tunnel_key_init(struct ip_tunnel_key *key,
175 __be32 saddr, __be32 daddr,
176 u8 tos, u8 ttl, __be32 label,
177 __be16 tp_src, __be16 tp_dst,
178 __be64 tun_id, __be16 tun_flags)
179 {
180 key->tun_id = tun_id;
181 key->u.ipv4.src = saddr;
182 key->u.ipv4.dst = daddr;
183 memset((unsigned char *)key + IP_TUNNEL_KEY_IPV4_PAD,
184 0, IP_TUNNEL_KEY_IPV4_PAD_LEN);
185 key->tos = tos;
186 key->ttl = ttl;
187 key->label = label;
188 key->tun_flags = tun_flags;
189
190 /* For the tunnel types on the top of IPsec, the tp_src and tp_dst of
191 * the upper tunnel are used.
192 * E.g: GRE over IPSEC, the tp_src and tp_port are zero.
193 */
194 key->tp_src = tp_src;
195 key->tp_dst = tp_dst;
196
197 /* Clear struct padding. */
198 if (sizeof(*key) != IP_TUNNEL_KEY_SIZE)
199 memset((unsigned char *)key + IP_TUNNEL_KEY_SIZE,
200 0, sizeof(*key) - IP_TUNNEL_KEY_SIZE);
201 }
202
203 static inline bool
204 ip_tunnel_dst_cache_usable(const struct sk_buff *skb,
205 const struct ip_tunnel_info *info)
206 {
207 if (skb->mark)
208 return false;
209 if (!info)
210 return true;
211 if (info->key.tun_flags & TUNNEL_NOCACHE)
212 return false;
213
214 return true;
215 }
216
217 static inline unsigned short ip_tunnel_info_af(const struct ip_tunnel_info
218 *tun_info)
219 {
220 return tun_info->mode & IP_TUNNEL_INFO_IPV6 ? AF_INET6 : AF_INET;
221 }
222
223 #ifdef CONFIG_INET
224
225 int ip_tunnel_init(struct net_device *dev);
226 void ip_tunnel_uninit(struct net_device *dev);
227 void ip_tunnel_dellink(struct net_device *dev, struct list_head *head);
228 struct net *ip_tunnel_get_link_net(const struct net_device *dev);
229 int ip_tunnel_get_iflink(const struct net_device *dev);
230 int ip_tunnel_init_net(struct net *net, int ip_tnl_net_id,
231 struct rtnl_link_ops *ops, char *devname);
232
233 void ip_tunnel_delete_net(struct ip_tunnel_net *itn, struct rtnl_link_ops *ops);
234
235 void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev,
236 const struct iphdr *tnl_params, const u8 protocol);
237 int ip_tunnel_ioctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd);
238 int __ip_tunnel_change_mtu(struct net_device *dev, int new_mtu, bool strict);
239 int ip_tunnel_change_mtu(struct net_device *dev, int new_mtu);
240
241 struct rtnl_link_stats64 *ip_tunnel_get_stats64(struct net_device *dev,
242 struct rtnl_link_stats64 *tot);
243 struct ip_tunnel *ip_tunnel_lookup(struct ip_tunnel_net *itn,
244 int link, __be16 flags,
245 __be32 remote, __be32 local,
246 __be32 key);
247
248 int ip_tunnel_rcv(struct ip_tunnel *tunnel, struct sk_buff *skb,
249 const struct tnl_ptk_info *tpi, struct metadata_dst *tun_dst,
250 bool log_ecn_error);
251 int ip_tunnel_changelink(struct net_device *dev, struct nlattr *tb[],
252 struct ip_tunnel_parm *p);
253 int ip_tunnel_newlink(struct net_device *dev, struct nlattr *tb[],
254 struct ip_tunnel_parm *p);
255 void ip_tunnel_setup(struct net_device *dev, int net_id);
256
257 struct ip_tunnel_encap_ops {
258 size_t (*encap_hlen)(struct ip_tunnel_encap *e);
259 int (*build_header)(struct sk_buff *skb, struct ip_tunnel_encap *e,
260 u8 *protocol, struct flowi4 *fl4);
261 };
262
263 #define MAX_IPTUN_ENCAP_OPS 8
264
265 extern const struct ip_tunnel_encap_ops __rcu *
266 iptun_encaps[MAX_IPTUN_ENCAP_OPS];
267
268 int ip_tunnel_encap_add_ops(const struct ip_tunnel_encap_ops *op,
269 unsigned int num);
270 int ip_tunnel_encap_del_ops(const struct ip_tunnel_encap_ops *op,
271 unsigned int num);
272
273 int ip_tunnel_encap_setup(struct ip_tunnel *t,
274 struct ip_tunnel_encap *ipencap);
275
276 static inline int ip_encap_hlen(struct ip_tunnel_encap *e)
277 {
278 const struct ip_tunnel_encap_ops *ops;
279 int hlen = -EINVAL;
280
281 if (e->type == TUNNEL_ENCAP_NONE)
282 return 0;
283
284 if (e->type >= MAX_IPTUN_ENCAP_OPS)
285 return -EINVAL;
286
287 rcu_read_lock();
288 ops = rcu_dereference(iptun_encaps[e->type]);
289 if (likely(ops && ops->encap_hlen))
290 hlen = ops->encap_hlen(e);
291 rcu_read_unlock();
292
293 return hlen;
294 }
295
296 static inline int ip_tunnel_encap(struct sk_buff *skb, struct ip_tunnel *t,
297 u8 *protocol, struct flowi4 *fl4)
298 {
299 const struct ip_tunnel_encap_ops *ops;
300 int ret = -EINVAL;
301
302 if (t->encap.type == TUNNEL_ENCAP_NONE)
303 return 0;
304
305 if (t->encap.type >= MAX_IPTUN_ENCAP_OPS)
306 return -EINVAL;
307
308 rcu_read_lock();
309 ops = rcu_dereference(iptun_encaps[t->encap.type]);
310 if (likely(ops && ops->build_header))
311 ret = ops->build_header(skb, &t->encap, protocol, fl4);
312 rcu_read_unlock();
313
314 return ret;
315 }
316
317 /* Extract dsfield from inner protocol */
318 static inline u8 ip_tunnel_get_dsfield(const struct iphdr *iph,
319 const struct sk_buff *skb)
320 {
321 if (skb->protocol == htons(ETH_P_IP))
322 return iph->tos;
323 else if (skb->protocol == htons(ETH_P_IPV6))
324 return ipv6_get_dsfield((const struct ipv6hdr *)iph);
325 else
326 return 0;
327 }
328
329 /* Propogate ECN bits out */
330 static inline u8 ip_tunnel_ecn_encap(u8 tos, const struct iphdr *iph,
331 const struct sk_buff *skb)
332 {
333 u8 inner = ip_tunnel_get_dsfield(iph, skb);
334
335 return INET_ECN_encapsulate(tos, inner);
336 }
337
338 int __iptunnel_pull_header(struct sk_buff *skb, int hdr_len,
339 __be16 inner_proto, bool raw_proto, bool xnet);
340
341 static inline int iptunnel_pull_header(struct sk_buff *skb, int hdr_len,
342 __be16 inner_proto, bool xnet)
343 {
344 return __iptunnel_pull_header(skb, hdr_len, inner_proto, false, xnet);
345 }
346
347 void iptunnel_xmit(struct sock *sk, struct rtable *rt, struct sk_buff *skb,
348 __be32 src, __be32 dst, u8 proto,
349 u8 tos, u8 ttl, __be16 df, bool xnet);
350 struct metadata_dst *iptunnel_metadata_reply(struct metadata_dst *md,
351 gfp_t flags);
352
353 int iptunnel_handle_offloads(struct sk_buff *skb, int gso_type_mask);
354
355 static inline int iptunnel_pull_offloads(struct sk_buff *skb)
356 {
357 if (skb_is_gso(skb)) {
358 int err;
359
360 err = skb_unclone(skb, GFP_ATOMIC);
361 if (unlikely(err))
362 return err;
363 skb_shinfo(skb)->gso_type &= ~(NETIF_F_GSO_ENCAP_ALL >>
364 NETIF_F_GSO_SHIFT);
365 }
366
367 skb->encapsulation = 0;
368 return 0;
369 }
370
371 static inline void iptunnel_xmit_stats(struct net_device *dev, int pkt_len)
372 {
373 if (pkt_len > 0) {
374 struct pcpu_sw_netstats *tstats = get_cpu_ptr(dev->tstats);
375
376 u64_stats_update_begin(&tstats->syncp);
377 tstats->tx_bytes += pkt_len;
378 tstats->tx_packets++;
379 u64_stats_update_end(&tstats->syncp);
380 put_cpu_ptr(tstats);
381 } else {
382 struct net_device_stats *err_stats = &dev->stats;
383
384 if (pkt_len < 0) {
385 err_stats->tx_errors++;
386 err_stats->tx_aborted_errors++;
387 } else {
388 err_stats->tx_dropped++;
389 }
390 }
391 }
392
393 static inline void *ip_tunnel_info_opts(struct ip_tunnel_info *info)
394 {
395 return info + 1;
396 }
397
398 static inline void ip_tunnel_info_opts_get(void *to,
399 const struct ip_tunnel_info *info)
400 {
401 memcpy(to, info + 1, info->options_len);
402 }
403
404 static inline void ip_tunnel_info_opts_set(struct ip_tunnel_info *info,
405 const void *from, int len)
406 {
407 memcpy(ip_tunnel_info_opts(info), from, len);
408 info->options_len = len;
409 }
410
411 static inline struct ip_tunnel_info *lwt_tun_info(struct lwtunnel_state *lwtstate)
412 {
413 return (struct ip_tunnel_info *)lwtstate->data;
414 }
415
416 extern struct static_key ip_tunnel_metadata_cnt;
417
418 /* Returns > 0 if metadata should be collected */
419 static inline int ip_tunnel_collect_metadata(void)
420 {
421 return static_key_false(&ip_tunnel_metadata_cnt);
422 }
423
424 void __init ip_tunnel_core_init(void);
425
426 void ip_tunnel_need_metadata(void);
427 void ip_tunnel_unneed_metadata(void);
428
429 #else /* CONFIG_INET */
430
431 static inline struct ip_tunnel_info *lwt_tun_info(struct lwtunnel_state *lwtstate)
432 {
433 return NULL;
434 }
435
436 static inline void ip_tunnel_need_metadata(void)
437 {
438 }
439
440 static inline void ip_tunnel_unneed_metadata(void)
441 {
442 }
443
444 static inline void ip_tunnel_info_opts_get(void *to,
445 const struct ip_tunnel_info *info)
446 {
447 }
448
449 static inline void ip_tunnel_info_opts_set(struct ip_tunnel_info *info,
450 const void *from, int len)
451 {
452 info->options_len = 0;
453 }
454
455 #endif /* CONFIG_INET */
456
457 #endif /* __NET_IP_TUNNELS_H */
Linux with added FPC-III support