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mmc: sdhci-pci: Let devices define how to add the host
[linux-2.6/btrfs-unstable.git] / include / net / ip_tunnels.h
blob95056796657cf9b11c24ae1497f1d5c01a9fd178
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 #define IP_TUNNEL_INFO_BRIDGE 0x04 /* represents a bridged tunnel id */
62
63 /* Maximum tunnel options length. */
64 #define IP_TUNNEL_OPTS_MAX \
65 GENMASK((FIELD_SIZEOF(struct ip_tunnel_info, \
66 options_len) * BITS_PER_BYTE) - 1, 0)
67
68 struct 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 /* 6rd prefix/relay information */
78 #ifdef CONFIG_IPV6_SIT_6RD
79 struct ip_tunnel_6rd_parm {
80 struct in6_addr prefix;
81 __be32 relay_prefix;
82 u16 prefixlen;
83 u16 relay_prefixlen;
84 };
85 #endif
86
87 struct ip_tunnel_encap {
88 u16 type;
89 u16 flags;
90 __be16 sport;
91 __be16 dport;
92 };
93
94 struct 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
101 struct metadata_dst;
102
103 struct ip_tunnel {
104 struct ip_tunnel __rcu *next;
105 struct hlist_node hash_node;
106 struct net_device *dev;
107 struct net *net; /* netns for packet i/o */
108
109 unsigned long err_time; /* Time when the last ICMP error
110 * arrived */
111 int err_count; /* Number of arrived ICMP errors */
112
113 /* These four fields used only by GRE */
114 u32 i_seqno; /* The last seen seqno */
115 u32 o_seqno; /* The last output seqno */
116 int tun_hlen; /* Precalculated header length */
117
118 struct dst_cache dst_cache;
119
120 struct ip_tunnel_parm parms;
121
122 int mlink;
123 int encap_hlen; /* Encap header length (FOU,GUE) */
124 int hlen; /* tun_hlen + encap_hlen */
125 struct ip_tunnel_encap encap;
126
127 /* for SIT */
128 #ifdef CONFIG_IPV6_SIT_6RD
129 struct ip_tunnel_6rd_parm ip6rd;
130 #endif
131 struct ip_tunnel_prl_entry __rcu *prl; /* potential router list */
132 unsigned int prl_count; /* # of entries in PRL */
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
156 struct 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
171 struct 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
177 static 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 /* For the tunnel types on the top of IPsec, the tp_src and tp_dst of
194 * the upper tunnel are used.
195 * E.g: GRE over IPSEC, the tp_src and tp_port are zero.
196 */
197 key->tp_src = tp_src;
198 key->tp_dst = tp_dst;
199
200 /* Clear struct padding. */
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
206 static inline bool
207 ip_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
220 static 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
226 static 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 /* Returns the least-significant 32 bits of a __be64. */
236 static 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
247 int ip_tunnel_init(struct net_device *dev);
248 void ip_tunnel_uninit(struct net_device *dev);
249 void ip_tunnel_dellink(struct net_device *dev, struct list_head *head);
250 struct net *ip_tunnel_get_link_net(const struct net_device *dev);
251 int ip_tunnel_get_iflink(const struct net_device *dev);
252 int ip_tunnel_init_net(struct net *net, unsigned int ip_tnl_net_id,
253 struct rtnl_link_ops *ops, char *devname);
254
255 void ip_tunnel_delete_net(struct ip_tunnel_net *itn, struct rtnl_link_ops *ops);
256
257 void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev,
258 const struct iphdr *tnl_params, const u8 protocol);
259 void ip_md_tunnel_xmit(struct sk_buff *skb, struct net_device *dev,
260 const u8 proto);
261 int ip_tunnel_ioctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd);
262 int __ip_tunnel_change_mtu(struct net_device *dev, int new_mtu, bool strict);
263 int ip_tunnel_change_mtu(struct net_device *dev, int new_mtu);
264
265 void ip_tunnel_get_stats64(struct net_device *dev,
266 struct rtnl_link_stats64 *tot);
267 struct ip_tunnel *ip_tunnel_lookup(struct ip_tunnel_net *itn,
268 int link, __be16 flags,
269 __be32 remote, __be32 local,
270 __be32 key);
271
272 int 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);
275 int ip_tunnel_changelink(struct net_device *dev, struct nlattr *tb[],
276 struct ip_tunnel_parm *p);
277 int ip_tunnel_newlink(struct net_device *dev, struct nlattr *tb[],
278 struct ip_tunnel_parm *p);
279 void ip_tunnel_setup(struct net_device *dev, unsigned int net_id);
280
281 struct 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
289 extern const struct ip_tunnel_encap_ops __rcu *
290 iptun_encaps[MAX_IPTUN_ENCAP_OPS];
291
292 int ip_tunnel_encap_add_ops(const struct ip_tunnel_encap_ops *op,
293 unsigned int num);
294 int ip_tunnel_encap_del_ops(const struct ip_tunnel_encap_ops *op,
295 unsigned int num);
296
297 int ip_tunnel_encap_setup(struct ip_tunnel *t,
298 struct ip_tunnel_encap *ipencap);
299
300 static 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
320 static 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 /* Extract dsfield from inner protocol */
342 static 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 /* Propogate ECN bits out */
354 static 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
362 int __iptunnel_pull_header(struct sk_buff *skb, int hdr_len,
363 __be16 inner_proto, bool raw_proto, bool xnet);
364
365 static 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
371 void 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);
374 struct metadata_dst *iptunnel_metadata_reply(struct metadata_dst *md,
375 gfp_t flags);
376
377 int iptunnel_handle_offloads(struct sk_buff *skb, int gso_type_mask);
378
379 static 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
395 static 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
417 static inline void *ip_tunnel_info_opts(struct ip_tunnel_info *info)
418 {
419 return info + 1;
420 }
421
422 static 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
428 static 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
435 static inline struct ip_tunnel_info *lwt_tun_info(struct lwtunnel_state *lwtstate)
436 {
437 return (struct ip_tunnel_info *)lwtstate->data;
438 }
439
440 extern struct static_key ip_tunnel_metadata_cnt;
441
442 /* Returns > 0 if metadata should be collected */
443 static inline int ip_tunnel_collect_metadata(void)
444 {
445 return static_key_false(&ip_tunnel_metadata_cnt);
446 }
447
448 void __init ip_tunnel_core_init(void);
449
450 void ip_tunnel_need_metadata(void);
451 void ip_tunnel_unneed_metadata(void);
452
453 #else /* CONFIG_INET */
454
455 static inline struct ip_tunnel_info *lwt_tun_info(struct lwtunnel_state *lwtstate)
456 {
457 return NULL;
458 }
459
460 static inline void ip_tunnel_need_metadata(void)
461 {
462 }
463
464 static inline void ip_tunnel_unneed_metadata(void)
465 {
466 }
467
468 static inline void ip_tunnel_info_opts_get(void *to,
469 const struct ip_tunnel_info *info)
470 {
471 }
472
473 static 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 /* CONFIG_INET */
480
481 #endif /* __NET_IP_TUNNELS_H */
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