1 | /* SPDX-License-Identifier: GPL-2.0 */ |
2 | #ifndef _NET_XFRM_H |
3 | #define _NET_XFRM_H |
4 | |
5 | #include <linux/compiler.h> |
6 | #include <linux/xfrm.h> |
7 | #include <linux/spinlock.h> |
8 | #include <linux/list.h> |
9 | #include <linux/skbuff.h> |
10 | #include <linux/socket.h> |
11 | #include <linux/pfkeyv2.h> |
12 | #include <linux/ipsec.h> |
13 | #include <linux/in6.h> |
14 | #include <linux/mutex.h> |
15 | #include <linux/audit.h> |
16 | #include <linux/slab.h> |
17 | #include <linux/refcount.h> |
18 | #include <linux/sockptr.h> |
19 | |
20 | #include <net/sock.h> |
21 | #include <net/dst.h> |
22 | #include <net/ip.h> |
23 | #include <net/route.h> |
24 | #include <net/ipv6.h> |
25 | #include <net/ip6_fib.h> |
26 | #include <net/flow.h> |
27 | #include <net/gro_cells.h> |
28 | |
29 | #include <linux/interrupt.h> |
30 | |
31 | #ifdef CONFIG_XFRM_STATISTICS |
32 | #include <net/snmp.h> |
33 | #endif |
34 | |
35 | #define XFRM_PROTO_ESP 50 |
36 | #define XFRM_PROTO_AH 51 |
37 | #define XFRM_PROTO_COMP 108 |
38 | #define XFRM_PROTO_IPIP 4 |
39 | #define XFRM_PROTO_IPV6 41 |
40 | #define XFRM_PROTO_ROUTING IPPROTO_ROUTING |
41 | #define XFRM_PROTO_DSTOPTS IPPROTO_DSTOPTS |
42 | |
43 | #define XFRM_ALIGN4(len) (((len) + 3) & ~3) |
44 | #define XFRM_ALIGN8(len) (((len) + 7) & ~7) |
45 | #define MODULE_ALIAS_XFRM_MODE(family, encap) \ |
46 | MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap)) |
47 | #define MODULE_ALIAS_XFRM_TYPE(family, proto) \ |
48 | MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto)) |
49 | #define MODULE_ALIAS_XFRM_OFFLOAD_TYPE(family, proto) \ |
50 | MODULE_ALIAS("xfrm-offload-" __stringify(family) "-" __stringify(proto)) |
51 | |
52 | #ifdef CONFIG_XFRM_STATISTICS |
53 | #define XFRM_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.xfrm_statistics, field) |
54 | #else |
55 | #define XFRM_INC_STATS(net, field) ((void)(net)) |
56 | #endif |
57 | |
58 | |
59 | /* Organization of SPD aka "XFRM rules" |
60 | ------------------------------------ |
61 | |
62 | Basic objects: |
63 | - policy rule, struct xfrm_policy (=SPD entry) |
64 | - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle) |
65 | - instance of a transformer, struct xfrm_state (=SA) |
66 | - template to clone xfrm_state, struct xfrm_tmpl |
67 | |
68 | SPD is plain linear list of xfrm_policy rules, ordered by priority. |
69 | (To be compatible with existing pfkeyv2 implementations, |
70 | many rules with priority of 0x7fffffff are allowed to exist and |
71 | such rules are ordered in an unpredictable way, thanks to bsd folks.) |
72 | |
73 | Lookup is plain linear search until the first match with selector. |
74 | |
75 | If "action" is "block", then we prohibit the flow, otherwise: |
76 | if "xfrms_nr" is zero, the flow passes untransformed. Otherwise, |
77 | policy entry has list of up to XFRM_MAX_DEPTH transformations, |
78 | described by templates xfrm_tmpl. Each template is resolved |
79 | to a complete xfrm_state (see below) and we pack bundle of transformations |
80 | to a dst_entry returned to requestor. |
81 | |
82 | dst -. xfrm .-> xfrm_state #1 |
83 | |---. child .-> dst -. xfrm .-> xfrm_state #2 |
84 | |---. child .-> dst -. xfrm .-> xfrm_state #3 |
85 | |---. child .-> NULL |
86 | |
87 | Bundles are cached at xrfm_policy struct (field ->bundles). |
88 | |
89 | |
90 | Resolution of xrfm_tmpl |
91 | ----------------------- |
92 | Template contains: |
93 | 1. ->mode Mode: transport or tunnel |
94 | 2. ->id.proto Protocol: AH/ESP/IPCOMP |
95 | 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode. |
96 | Q: allow to resolve security gateway? |
97 | 4. ->id.spi If not zero, static SPI. |
98 | 5. ->saddr Local tunnel endpoint, ignored for transport mode. |
99 | 6. ->algos List of allowed algos. Plain bitmask now. |
100 | Q: ealgos, aalgos, calgos. What a mess... |
101 | 7. ->share Sharing mode. |
102 | Q: how to implement private sharing mode? To add struct sock* to |
103 | flow id? |
104 | |
105 | Having this template we search through SAD searching for entries |
106 | with appropriate mode/proto/algo, permitted by selector. |
107 | If no appropriate entry found, it is requested from key manager. |
108 | |
109 | PROBLEMS: |
110 | Q: How to find all the bundles referring to a physical path for |
111 | PMTU discovery? Seems, dst should contain list of all parents... |
112 | and enter to infinite locking hierarchy disaster. |
113 | No! It is easier, we will not search for them, let them find us. |
114 | We add genid to each dst plus pointer to genid of raw IP route, |
115 | pmtu disc will update pmtu on raw IP route and increase its genid. |
116 | dst_check() will see this for top level and trigger resyncing |
117 | metrics. Plus, it will be made via sk->sk_dst_cache. Solved. |
118 | */ |
119 | |
120 | struct xfrm_state_walk { |
121 | struct list_head all; |
122 | u8 state; |
123 | u8 dying; |
124 | u8 proto; |
125 | u32 seq; |
126 | struct xfrm_address_filter *filter; |
127 | }; |
128 | |
129 | enum { |
130 | XFRM_DEV_OFFLOAD_IN = 1, |
131 | XFRM_DEV_OFFLOAD_OUT, |
132 | }; |
133 | |
134 | struct xfrm_dev_offload { |
135 | struct net_device *dev; |
136 | netdevice_tracker dev_tracker; |
137 | struct net_device *real_dev; |
138 | unsigned long offload_handle; |
139 | u8 dir : 2; |
140 | }; |
141 | |
142 | struct xfrm_mode { |
143 | u8 encap; |
144 | u8 family; |
145 | u8 flags; |
146 | }; |
147 | |
148 | /* Flags for xfrm_mode. */ |
149 | enum { |
150 | XFRM_MODE_FLAG_TUNNEL = 1, |
151 | }; |
152 | |
153 | enum xfrm_replay_mode { |
154 | XFRM_REPLAY_MODE_LEGACY, |
155 | XFRM_REPLAY_MODE_BMP, |
156 | XFRM_REPLAY_MODE_ESN, |
157 | }; |
158 | |
159 | /* Full description of state of transformer. */ |
160 | struct xfrm_state { |
161 | possible_net_t xs_net; |
162 | union { |
163 | struct hlist_node gclist; |
164 | struct hlist_node bydst; |
165 | }; |
166 | struct hlist_node bysrc; |
167 | struct hlist_node byspi; |
168 | struct hlist_node byseq; |
169 | |
170 | refcount_t refcnt; |
171 | spinlock_t lock; |
172 | |
173 | struct xfrm_id id; |
174 | struct xfrm_selector sel; |
175 | struct xfrm_mark mark; |
176 | u32 if_id; |
177 | u32 tfcpad; |
178 | |
179 | u32 genid; |
180 | |
181 | /* Key manager bits */ |
182 | struct xfrm_state_walk km; |
183 | |
184 | /* Parameters of this state. */ |
185 | struct { |
186 | u32 reqid; |
187 | u8 mode; |
188 | u8 replay_window; |
189 | u8 aalgo, ealgo, calgo; |
190 | u8 flags; |
191 | u16 family; |
192 | xfrm_address_t saddr; |
193 | int ; |
194 | int trailer_len; |
195 | u32 ; |
196 | struct xfrm_mark smark; |
197 | } props; |
198 | |
199 | struct xfrm_lifetime_cfg lft; |
200 | |
201 | /* Data for transformer */ |
202 | struct xfrm_algo_auth *aalg; |
203 | struct xfrm_algo *ealg; |
204 | struct xfrm_algo *calg; |
205 | struct xfrm_algo_aead *aead; |
206 | const char *geniv; |
207 | |
208 | /* mapping change rate limiting */ |
209 | __be16 new_mapping_sport; |
210 | u32 new_mapping; /* seconds */ |
211 | u32 mapping_maxage; /* seconds for input SA */ |
212 | |
213 | /* Data for encapsulator */ |
214 | struct xfrm_encap_tmpl *encap; |
215 | struct sock __rcu *encap_sk; |
216 | |
217 | /* Data for care-of address */ |
218 | xfrm_address_t *coaddr; |
219 | |
220 | /* IPComp needs an IPIP tunnel for handling uncompressed packets */ |
221 | struct xfrm_state *tunnel; |
222 | |
223 | /* If a tunnel, number of users + 1 */ |
224 | atomic_t tunnel_users; |
225 | |
226 | /* State for replay detection */ |
227 | struct xfrm_replay_state replay; |
228 | struct xfrm_replay_state_esn *replay_esn; |
229 | |
230 | /* Replay detection state at the time we sent the last notification */ |
231 | struct xfrm_replay_state preplay; |
232 | struct xfrm_replay_state_esn *preplay_esn; |
233 | |
234 | /* replay detection mode */ |
235 | enum xfrm_replay_mode repl_mode; |
236 | /* internal flag that only holds state for delayed aevent at the |
237 | * moment |
238 | */ |
239 | u32 xflags; |
240 | |
241 | /* Replay detection notification settings */ |
242 | u32 replay_maxage; |
243 | u32 replay_maxdiff; |
244 | |
245 | /* Replay detection notification timer */ |
246 | struct timer_list rtimer; |
247 | |
248 | /* Statistics */ |
249 | struct xfrm_stats stats; |
250 | |
251 | struct xfrm_lifetime_cur curlft; |
252 | struct hrtimer mtimer; |
253 | |
254 | struct xfrm_dev_offload xso; |
255 | |
256 | /* used to fix curlft->add_time when changing date */ |
257 | long saved_tmo; |
258 | |
259 | /* Last used time */ |
260 | time64_t lastused; |
261 | |
262 | struct page_frag xfrag; |
263 | |
264 | /* Reference to data common to all the instances of this |
265 | * transformer. */ |
266 | const struct xfrm_type *type; |
267 | struct xfrm_mode inner_mode; |
268 | struct xfrm_mode inner_mode_iaf; |
269 | struct xfrm_mode outer_mode; |
270 | |
271 | const struct xfrm_type_offload *type_offload; |
272 | |
273 | /* Security context */ |
274 | struct xfrm_sec_ctx *security; |
275 | |
276 | /* Private data of this transformer, format is opaque, |
277 | * interpreted by xfrm_type methods. */ |
278 | void *data; |
279 | }; |
280 | |
281 | static inline struct net *xs_net(struct xfrm_state *x) |
282 | { |
283 | return read_pnet(&x->xs_net); |
284 | } |
285 | |
286 | /* xflags - make enum if more show up */ |
287 | #define XFRM_TIME_DEFER 1 |
288 | #define XFRM_SOFT_EXPIRE 2 |
289 | |
290 | enum { |
291 | XFRM_STATE_VOID, |
292 | XFRM_STATE_ACQ, |
293 | XFRM_STATE_VALID, |
294 | XFRM_STATE_ERROR, |
295 | XFRM_STATE_EXPIRED, |
296 | XFRM_STATE_DEAD |
297 | }; |
298 | |
299 | /* callback structure passed from either netlink or pfkey */ |
300 | struct km_event { |
301 | union { |
302 | u32 hard; |
303 | u32 proto; |
304 | u32 byid; |
305 | u32 aevent; |
306 | u32 type; |
307 | } data; |
308 | |
309 | u32 seq; |
310 | u32 portid; |
311 | u32 event; |
312 | struct net *net; |
313 | }; |
314 | |
315 | struct xfrm_if_cb { |
316 | struct xfrm_if *(*decode_session)(struct sk_buff *skb, |
317 | unsigned short family); |
318 | }; |
319 | |
320 | void xfrm_if_register_cb(const struct xfrm_if_cb *ifcb); |
321 | void xfrm_if_unregister_cb(void); |
322 | |
323 | struct net_device; |
324 | struct xfrm_type; |
325 | struct xfrm_dst; |
326 | struct xfrm_policy_afinfo { |
327 | struct dst_ops *dst_ops; |
328 | struct dst_entry *(*dst_lookup)(struct net *net, |
329 | int tos, int oif, |
330 | const xfrm_address_t *saddr, |
331 | const xfrm_address_t *daddr, |
332 | u32 mark); |
333 | int (*get_saddr)(struct net *net, int oif, |
334 | xfrm_address_t *saddr, |
335 | xfrm_address_t *daddr, |
336 | u32 mark); |
337 | int (*fill_dst)(struct xfrm_dst *xdst, |
338 | struct net_device *dev, |
339 | const struct flowi *fl); |
340 | struct dst_entry *(*blackhole_route)(struct net *net, struct dst_entry *orig); |
341 | }; |
342 | |
343 | int xfrm_policy_register_afinfo(const struct xfrm_policy_afinfo *afinfo, int family); |
344 | void xfrm_policy_unregister_afinfo(const struct xfrm_policy_afinfo *afinfo); |
345 | void km_policy_notify(struct xfrm_policy *xp, int dir, |
346 | const struct km_event *c); |
347 | void km_state_notify(struct xfrm_state *x, const struct km_event *c); |
348 | |
349 | struct xfrm_tmpl; |
350 | int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, |
351 | struct xfrm_policy *pol); |
352 | void km_state_expired(struct xfrm_state *x, int hard, u32 portid); |
353 | int __xfrm_state_delete(struct xfrm_state *x); |
354 | |
355 | struct xfrm_state_afinfo { |
356 | u8 family; |
357 | u8 proto; |
358 | |
359 | const struct xfrm_type_offload *type_offload_esp; |
360 | |
361 | const struct xfrm_type *type_esp; |
362 | const struct xfrm_type *type_ipip; |
363 | const struct xfrm_type *type_ipip6; |
364 | const struct xfrm_type *type_comp; |
365 | const struct xfrm_type *type_ah; |
366 | const struct xfrm_type *type_routing; |
367 | const struct xfrm_type *type_dstopts; |
368 | |
369 | int (*output)(struct net *net, struct sock *sk, struct sk_buff *skb); |
370 | int (*transport_finish)(struct sk_buff *skb, |
371 | int async); |
372 | void (*local_error)(struct sk_buff *skb, u32 mtu); |
373 | }; |
374 | |
375 | int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo); |
376 | int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo); |
377 | struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family); |
378 | struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family); |
379 | |
380 | struct xfrm_input_afinfo { |
381 | u8 family; |
382 | bool is_ipip; |
383 | int (*callback)(struct sk_buff *skb, u8 protocol, |
384 | int err); |
385 | }; |
386 | |
387 | int xfrm_input_register_afinfo(const struct xfrm_input_afinfo *afinfo); |
388 | int xfrm_input_unregister_afinfo(const struct xfrm_input_afinfo *afinfo); |
389 | |
390 | void xfrm_flush_gc(void); |
391 | void xfrm_state_delete_tunnel(struct xfrm_state *x); |
392 | |
393 | struct xfrm_type { |
394 | struct module *owner; |
395 | u8 proto; |
396 | u8 flags; |
397 | #define XFRM_TYPE_NON_FRAGMENT 1 |
398 | #define XFRM_TYPE_REPLAY_PROT 2 |
399 | #define XFRM_TYPE_LOCAL_COADDR 4 |
400 | #define XFRM_TYPE_REMOTE_COADDR 8 |
401 | |
402 | int (*init_state)(struct xfrm_state *x); |
403 | void (*destructor)(struct xfrm_state *); |
404 | int (*input)(struct xfrm_state *, struct sk_buff *skb); |
405 | int (*output)(struct xfrm_state *, struct sk_buff *pskb); |
406 | int (*reject)(struct xfrm_state *, struct sk_buff *, |
407 | const struct flowi *); |
408 | }; |
409 | |
410 | int xfrm_register_type(const struct xfrm_type *type, unsigned short family); |
411 | void xfrm_unregister_type(const struct xfrm_type *type, unsigned short family); |
412 | |
413 | struct xfrm_type_offload { |
414 | struct module *owner; |
415 | u8 proto; |
416 | void (*encap)(struct xfrm_state *, struct sk_buff *pskb); |
417 | int (*input_tail)(struct xfrm_state *x, struct sk_buff *skb); |
418 | int (*xmit)(struct xfrm_state *, struct sk_buff *pskb, netdev_features_t features); |
419 | }; |
420 | |
421 | int xfrm_register_type_offload(const struct xfrm_type_offload *type, unsigned short family); |
422 | void xfrm_unregister_type_offload(const struct xfrm_type_offload *type, unsigned short family); |
423 | |
424 | static inline int xfrm_af2proto(unsigned int family) |
425 | { |
426 | switch(family) { |
427 | case AF_INET: |
428 | return IPPROTO_IPIP; |
429 | case AF_INET6: |
430 | return IPPROTO_IPV6; |
431 | default: |
432 | return 0; |
433 | } |
434 | } |
435 | |
436 | static inline const struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto) |
437 | { |
438 | if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) || |
439 | (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6)) |
440 | return &x->inner_mode; |
441 | else |
442 | return &x->inner_mode_iaf; |
443 | } |
444 | |
445 | struct xfrm_tmpl { |
446 | /* id in template is interpreted as: |
447 | * daddr - destination of tunnel, may be zero for transport mode. |
448 | * spi - zero to acquire spi. Not zero if spi is static, then |
449 | * daddr must be fixed too. |
450 | * proto - AH/ESP/IPCOMP |
451 | */ |
452 | struct xfrm_id id; |
453 | |
454 | /* Source address of tunnel. Ignored, if it is not a tunnel. */ |
455 | xfrm_address_t saddr; |
456 | |
457 | unsigned short encap_family; |
458 | |
459 | u32 reqid; |
460 | |
461 | /* Mode: transport, tunnel etc. */ |
462 | u8 mode; |
463 | |
464 | /* Sharing mode: unique, this session only, this user only etc. */ |
465 | u8 share; |
466 | |
467 | /* May skip this transfomration if no SA is found */ |
468 | u8 optional; |
469 | |
470 | /* Skip aalgos/ealgos/calgos checks. */ |
471 | u8 allalgs; |
472 | |
473 | /* Bit mask of algos allowed for acquisition */ |
474 | u32 aalgos; |
475 | u32 ealgos; |
476 | u32 calgos; |
477 | }; |
478 | |
479 | #define XFRM_MAX_DEPTH 6 |
480 | #define XFRM_MAX_OFFLOAD_DEPTH 1 |
481 | |
482 | struct xfrm_policy_walk_entry { |
483 | struct list_head all; |
484 | u8 dead; |
485 | }; |
486 | |
487 | struct xfrm_policy_walk { |
488 | struct xfrm_policy_walk_entry walk; |
489 | u8 type; |
490 | u32 seq; |
491 | }; |
492 | |
493 | struct xfrm_policy_queue { |
494 | struct sk_buff_head hold_queue; |
495 | struct timer_list hold_timer; |
496 | unsigned long timeout; |
497 | }; |
498 | |
499 | struct xfrm_policy { |
500 | possible_net_t xp_net; |
501 | struct hlist_node bydst; |
502 | struct hlist_node byidx; |
503 | |
504 | /* This lock only affects elements except for entry. */ |
505 | rwlock_t lock; |
506 | refcount_t refcnt; |
507 | u32 pos; |
508 | struct timer_list timer; |
509 | |
510 | atomic_t genid; |
511 | u32 priority; |
512 | u32 index; |
513 | u32 if_id; |
514 | struct xfrm_mark mark; |
515 | struct xfrm_selector selector; |
516 | struct xfrm_lifetime_cfg lft; |
517 | struct xfrm_lifetime_cur curlft; |
518 | struct xfrm_policy_walk_entry walk; |
519 | struct xfrm_policy_queue polq; |
520 | bool bydst_reinsert; |
521 | u8 type; |
522 | u8 action; |
523 | u8 flags; |
524 | u8 xfrm_nr; |
525 | u16 family; |
526 | struct xfrm_sec_ctx *security; |
527 | struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH]; |
528 | struct hlist_node bydst_inexact_list; |
529 | struct rcu_head rcu; |
530 | }; |
531 | |
532 | static inline struct net *xp_net(const struct xfrm_policy *xp) |
533 | { |
534 | return read_pnet(&xp->xp_net); |
535 | } |
536 | |
537 | struct xfrm_kmaddress { |
538 | xfrm_address_t local; |
539 | xfrm_address_t remote; |
540 | u32 reserved; |
541 | u16 family; |
542 | }; |
543 | |
544 | struct xfrm_migrate { |
545 | xfrm_address_t old_daddr; |
546 | xfrm_address_t old_saddr; |
547 | xfrm_address_t new_daddr; |
548 | xfrm_address_t new_saddr; |
549 | u8 proto; |
550 | u8 mode; |
551 | u16 reserved; |
552 | u32 reqid; |
553 | u16 old_family; |
554 | u16 new_family; |
555 | }; |
556 | |
557 | #define XFRM_KM_TIMEOUT 30 |
558 | /* what happened */ |
559 | #define XFRM_REPLAY_UPDATE XFRM_AE_CR |
560 | #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE |
561 | |
562 | /* default aevent timeout in units of 100ms */ |
563 | #define XFRM_AE_ETIME 10 |
564 | /* Async Event timer multiplier */ |
565 | #define XFRM_AE_ETH_M 10 |
566 | /* default seq threshold size */ |
567 | #define XFRM_AE_SEQT_SIZE 2 |
568 | |
569 | struct xfrm_mgr { |
570 | struct list_head list; |
571 | int (*notify)(struct xfrm_state *x, const struct km_event *c); |
572 | int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp); |
573 | struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir); |
574 | int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport); |
575 | int (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c); |
576 | int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr); |
577 | int (*migrate)(const struct xfrm_selector *sel, |
578 | u8 dir, u8 type, |
579 | const struct xfrm_migrate *m, |
580 | int num_bundles, |
581 | const struct xfrm_kmaddress *k, |
582 | const struct xfrm_encap_tmpl *encap); |
583 | bool (*is_alive)(const struct km_event *c); |
584 | }; |
585 | |
586 | void xfrm_register_km(struct xfrm_mgr *km); |
587 | void xfrm_unregister_km(struct xfrm_mgr *km); |
588 | |
589 | struct xfrm_tunnel_skb_cb { |
590 | union { |
591 | struct inet_skb_parm h4; |
592 | struct inet6_skb_parm h6; |
593 | } ; |
594 | |
595 | union { |
596 | struct ip_tunnel *ip4; |
597 | struct ip6_tnl *ip6; |
598 | } tunnel; |
599 | }; |
600 | |
601 | #define XFRM_TUNNEL_SKB_CB(__skb) ((struct xfrm_tunnel_skb_cb *)&((__skb)->cb[0])) |
602 | |
603 | /* |
604 | * This structure is used for the duration where packets are being |
605 | * transformed by IPsec. As soon as the packet leaves IPsec the |
606 | * area beyond the generic IP part may be overwritten. |
607 | */ |
608 | struct xfrm_skb_cb { |
609 | struct xfrm_tunnel_skb_cb ; |
610 | |
611 | /* Sequence number for replay protection. */ |
612 | union { |
613 | struct { |
614 | __u32 low; |
615 | __u32 hi; |
616 | } output; |
617 | struct { |
618 | __be32 low; |
619 | __be32 hi; |
620 | } input; |
621 | } seq; |
622 | }; |
623 | |
624 | #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0])) |
625 | |
626 | /* |
627 | * This structure is used by the afinfo prepare_input/prepare_output functions |
628 | * to transmit header information to the mode input/output functions. |
629 | */ |
630 | struct xfrm_mode_skb_cb { |
631 | struct xfrm_tunnel_skb_cb ; |
632 | |
633 | /* Copied from header for IPv4, always set to zero and DF for IPv6. */ |
634 | __be16 id; |
635 | __be16 frag_off; |
636 | |
637 | /* IP header length (excluding options or extension headers). */ |
638 | u8 ihl; |
639 | |
640 | /* TOS for IPv4, class for IPv6. */ |
641 | u8 tos; |
642 | |
643 | /* TTL for IPv4, hop limitfor IPv6. */ |
644 | u8 ttl; |
645 | |
646 | /* Protocol for IPv4, NH for IPv6. */ |
647 | u8 protocol; |
648 | |
649 | /* Option length for IPv4, zero for IPv6. */ |
650 | u8 optlen; |
651 | |
652 | /* Used by IPv6 only, zero for IPv4. */ |
653 | u8 flow_lbl[3]; |
654 | }; |
655 | |
656 | #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0])) |
657 | |
658 | /* |
659 | * This structure is used by the input processing to locate the SPI and |
660 | * related information. |
661 | */ |
662 | struct xfrm_spi_skb_cb { |
663 | struct xfrm_tunnel_skb_cb ; |
664 | |
665 | unsigned int daddroff; |
666 | unsigned int family; |
667 | __be32 seq; |
668 | }; |
669 | |
670 | #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0])) |
671 | |
672 | #ifdef CONFIG_AUDITSYSCALL |
673 | static inline struct audit_buffer *xfrm_audit_start(const char *op) |
674 | { |
675 | struct audit_buffer *audit_buf = NULL; |
676 | |
677 | if (audit_enabled == AUDIT_OFF) |
678 | return NULL; |
679 | audit_buf = audit_log_start(audit_context(), GFP_ATOMIC, |
680 | AUDIT_MAC_IPSEC_EVENT); |
681 | if (audit_buf == NULL) |
682 | return NULL; |
683 | audit_log_format(audit_buf, "op=%s" , op); |
684 | return audit_buf; |
685 | } |
686 | |
687 | static inline void xfrm_audit_helper_usrinfo(bool task_valid, |
688 | struct audit_buffer *audit_buf) |
689 | { |
690 | const unsigned int auid = from_kuid(&init_user_ns, task_valid ? |
691 | audit_get_loginuid(current) : |
692 | INVALID_UID); |
693 | const unsigned int ses = task_valid ? audit_get_sessionid(current) : |
694 | AUDIT_SID_UNSET; |
695 | |
696 | audit_log_format(audit_buf, " auid=%u ses=%u" , auid, ses); |
697 | audit_log_task_context(audit_buf); |
698 | } |
699 | |
700 | void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid); |
701 | void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, |
702 | bool task_valid); |
703 | void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid); |
704 | void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid); |
705 | void xfrm_audit_state_replay_overflow(struct xfrm_state *x, |
706 | struct sk_buff *skb); |
707 | void xfrm_audit_state_replay(struct xfrm_state *x, struct sk_buff *skb, |
708 | __be32 net_seq); |
709 | void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family); |
710 | void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, __be32 net_spi, |
711 | __be32 net_seq); |
712 | void xfrm_audit_state_icvfail(struct xfrm_state *x, struct sk_buff *skb, |
713 | u8 proto); |
714 | #else |
715 | |
716 | static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, |
717 | bool task_valid) |
718 | { |
719 | } |
720 | |
721 | static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, |
722 | bool task_valid) |
723 | { |
724 | } |
725 | |
726 | static inline void xfrm_audit_state_add(struct xfrm_state *x, int result, |
727 | bool task_valid) |
728 | { |
729 | } |
730 | |
731 | static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result, |
732 | bool task_valid) |
733 | { |
734 | } |
735 | |
736 | static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x, |
737 | struct sk_buff *skb) |
738 | { |
739 | } |
740 | |
741 | static inline void xfrm_audit_state_replay(struct xfrm_state *x, |
742 | struct sk_buff *skb, __be32 net_seq) |
743 | { |
744 | } |
745 | |
746 | static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb, |
747 | u16 family) |
748 | { |
749 | } |
750 | |
751 | static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, |
752 | __be32 net_spi, __be32 net_seq) |
753 | { |
754 | } |
755 | |
756 | static inline void xfrm_audit_state_icvfail(struct xfrm_state *x, |
757 | struct sk_buff *skb, u8 proto) |
758 | { |
759 | } |
760 | #endif /* CONFIG_AUDITSYSCALL */ |
761 | |
762 | static inline void xfrm_pol_hold(struct xfrm_policy *policy) |
763 | { |
764 | if (likely(policy != NULL)) |
765 | refcount_inc(&policy->refcnt); |
766 | } |
767 | |
768 | void xfrm_policy_destroy(struct xfrm_policy *policy); |
769 | |
770 | static inline void xfrm_pol_put(struct xfrm_policy *policy) |
771 | { |
772 | if (refcount_dec_and_test(&policy->refcnt)) |
773 | xfrm_policy_destroy(policy); |
774 | } |
775 | |
776 | static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols) |
777 | { |
778 | int i; |
779 | for (i = npols - 1; i >= 0; --i) |
780 | xfrm_pol_put(pols[i]); |
781 | } |
782 | |
783 | void __xfrm_state_destroy(struct xfrm_state *, bool); |
784 | |
785 | static inline void __xfrm_state_put(struct xfrm_state *x) |
786 | { |
787 | refcount_dec(&x->refcnt); |
788 | } |
789 | |
790 | static inline void xfrm_state_put(struct xfrm_state *x) |
791 | { |
792 | if (refcount_dec_and_test(&x->refcnt)) |
793 | __xfrm_state_destroy(x, false); |
794 | } |
795 | |
796 | static inline void xfrm_state_put_sync(struct xfrm_state *x) |
797 | { |
798 | if (refcount_dec_and_test(&x->refcnt)) |
799 | __xfrm_state_destroy(x, true); |
800 | } |
801 | |
802 | static inline void xfrm_state_hold(struct xfrm_state *x) |
803 | { |
804 | refcount_inc(&x->refcnt); |
805 | } |
806 | |
807 | static inline bool addr_match(const void *token1, const void *token2, |
808 | unsigned int prefixlen) |
809 | { |
810 | const __be32 *a1 = token1; |
811 | const __be32 *a2 = token2; |
812 | unsigned int pdw; |
813 | unsigned int pbi; |
814 | |
815 | pdw = prefixlen >> 5; /* num of whole u32 in prefix */ |
816 | pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */ |
817 | |
818 | if (pdw) |
819 | if (memcmp(a1, a2, pdw << 2)) |
820 | return false; |
821 | |
822 | if (pbi) { |
823 | __be32 mask; |
824 | |
825 | mask = htonl((0xffffffff) << (32 - pbi)); |
826 | |
827 | if ((a1[pdw] ^ a2[pdw]) & mask) |
828 | return false; |
829 | } |
830 | |
831 | return true; |
832 | } |
833 | |
834 | static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen) |
835 | { |
836 | /* C99 6.5.7 (3): u32 << 32 is undefined behaviour */ |
837 | if (sizeof(long) == 4 && prefixlen == 0) |
838 | return true; |
839 | return !((a1 ^ a2) & htonl(~0UL << (32 - prefixlen))); |
840 | } |
841 | |
842 | static __inline__ |
843 | __be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli) |
844 | { |
845 | __be16 port; |
846 | switch(fl->flowi_proto) { |
847 | case IPPROTO_TCP: |
848 | case IPPROTO_UDP: |
849 | case IPPROTO_UDPLITE: |
850 | case IPPROTO_SCTP: |
851 | port = uli->ports.sport; |
852 | break; |
853 | case IPPROTO_ICMP: |
854 | case IPPROTO_ICMPV6: |
855 | port = htons(uli->icmpt.type); |
856 | break; |
857 | case IPPROTO_MH: |
858 | port = htons(uli->mht.type); |
859 | break; |
860 | case IPPROTO_GRE: |
861 | port = htons(ntohl(uli->gre_key) >> 16); |
862 | break; |
863 | default: |
864 | port = 0; /*XXX*/ |
865 | } |
866 | return port; |
867 | } |
868 | |
869 | static __inline__ |
870 | __be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli) |
871 | { |
872 | __be16 port; |
873 | switch(fl->flowi_proto) { |
874 | case IPPROTO_TCP: |
875 | case IPPROTO_UDP: |
876 | case IPPROTO_UDPLITE: |
877 | case IPPROTO_SCTP: |
878 | port = uli->ports.dport; |
879 | break; |
880 | case IPPROTO_ICMP: |
881 | case IPPROTO_ICMPV6: |
882 | port = htons(uli->icmpt.code); |
883 | break; |
884 | case IPPROTO_GRE: |
885 | port = htons(ntohl(uli->gre_key) & 0xffff); |
886 | break; |
887 | default: |
888 | port = 0; /*XXX*/ |
889 | } |
890 | return port; |
891 | } |
892 | |
893 | bool xfrm_selector_match(const struct xfrm_selector *sel, |
894 | const struct flowi *fl, unsigned short family); |
895 | |
896 | #ifdef CONFIG_SECURITY_NETWORK_XFRM |
897 | /* If neither has a context --> match |
898 | * Otherwise, both must have a context and the sids, doi, alg must match |
899 | */ |
900 | static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2) |
901 | { |
902 | return ((!s1 && !s2) || |
903 | (s1 && s2 && |
904 | (s1->ctx_sid == s2->ctx_sid) && |
905 | (s1->ctx_doi == s2->ctx_doi) && |
906 | (s1->ctx_alg == s2->ctx_alg))); |
907 | } |
908 | #else |
909 | static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2) |
910 | { |
911 | return true; |
912 | } |
913 | #endif |
914 | |
915 | /* A struct encoding bundle of transformations to apply to some set of flow. |
916 | * |
917 | * xdst->child points to the next element of bundle. |
918 | * dst->xfrm points to an instanse of transformer. |
919 | * |
920 | * Due to unfortunate limitations of current routing cache, which we |
921 | * have no time to fix, it mirrors struct rtable and bound to the same |
922 | * routing key, including saddr,daddr. However, we can have many of |
923 | * bundles differing by session id. All the bundles grow from a parent |
924 | * policy rule. |
925 | */ |
926 | struct xfrm_dst { |
927 | union { |
928 | struct dst_entry dst; |
929 | struct rtable rt; |
930 | struct rt6_info rt6; |
931 | } u; |
932 | struct dst_entry *route; |
933 | struct dst_entry *child; |
934 | struct dst_entry *path; |
935 | struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; |
936 | int num_pols, num_xfrms; |
937 | u32 xfrm_genid; |
938 | u32 policy_genid; |
939 | u32 route_mtu_cached; |
940 | u32 child_mtu_cached; |
941 | u32 route_cookie; |
942 | u32 path_cookie; |
943 | }; |
944 | |
945 | static inline struct dst_entry *xfrm_dst_path(const struct dst_entry *dst) |
946 | { |
947 | #ifdef CONFIG_XFRM |
948 | if (dst->xfrm || (dst->flags & DST_XFRM_QUEUE)) { |
949 | const struct xfrm_dst *xdst = (const struct xfrm_dst *) dst; |
950 | |
951 | return xdst->path; |
952 | } |
953 | #endif |
954 | return (struct dst_entry *) dst; |
955 | } |
956 | |
957 | static inline struct dst_entry *xfrm_dst_child(const struct dst_entry *dst) |
958 | { |
959 | #ifdef CONFIG_XFRM |
960 | if (dst->xfrm || (dst->flags & DST_XFRM_QUEUE)) { |
961 | struct xfrm_dst *xdst = (struct xfrm_dst *) dst; |
962 | return xdst->child; |
963 | } |
964 | #endif |
965 | return NULL; |
966 | } |
967 | |
968 | #ifdef CONFIG_XFRM |
969 | static inline void xfrm_dst_set_child(struct xfrm_dst *xdst, struct dst_entry *child) |
970 | { |
971 | xdst->child = child; |
972 | } |
973 | |
974 | static inline void xfrm_dst_destroy(struct xfrm_dst *xdst) |
975 | { |
976 | xfrm_pols_put(xdst->pols, xdst->num_pols); |
977 | dst_release(xdst->route); |
978 | if (likely(xdst->u.dst.xfrm)) |
979 | xfrm_state_put(xdst->u.dst.xfrm); |
980 | } |
981 | #endif |
982 | |
983 | void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev); |
984 | |
985 | struct xfrm_if_parms { |
986 | int link; /* ifindex of underlying L2 interface */ |
987 | u32 if_id; /* interface identifyer */ |
988 | }; |
989 | |
990 | struct xfrm_if { |
991 | struct xfrm_if __rcu *next; /* next interface in list */ |
992 | struct net_device *dev; /* virtual device associated with interface */ |
993 | struct net *net; /* netns for packet i/o */ |
994 | struct xfrm_if_parms p; /* interface parms */ |
995 | |
996 | struct gro_cells gro_cells; |
997 | }; |
998 | |
999 | struct xfrm_offload { |
1000 | /* Output sequence number for replay protection on offloading. */ |
1001 | struct { |
1002 | __u32 low; |
1003 | __u32 hi; |
1004 | } seq; |
1005 | |
1006 | __u32 flags; |
1007 | #define SA_DELETE_REQ 1 |
1008 | #define CRYPTO_DONE 2 |
1009 | #define CRYPTO_NEXT_DONE 4 |
1010 | #define CRYPTO_FALLBACK 8 |
1011 | #define XFRM_GSO_SEGMENT 16 |
1012 | #define XFRM_GRO 32 |
1013 | /* 64 is free */ |
1014 | #define XFRM_DEV_RESUME 128 |
1015 | #define XFRM_XMIT 256 |
1016 | |
1017 | __u32 status; |
1018 | #define CRYPTO_SUCCESS 1 |
1019 | #define CRYPTO_GENERIC_ERROR 2 |
1020 | #define CRYPTO_TRANSPORT_AH_AUTH_FAILED 4 |
1021 | #define CRYPTO_TRANSPORT_ESP_AUTH_FAILED 8 |
1022 | #define CRYPTO_TUNNEL_AH_AUTH_FAILED 16 |
1023 | #define CRYPTO_TUNNEL_ESP_AUTH_FAILED 32 |
1024 | #define CRYPTO_INVALID_PACKET_SYNTAX 64 |
1025 | #define CRYPTO_INVALID_PROTOCOL 128 |
1026 | |
1027 | __u8 proto; |
1028 | __u8 inner_ipproto; |
1029 | }; |
1030 | |
1031 | struct sec_path { |
1032 | int len; |
1033 | int olen; |
1034 | |
1035 | struct xfrm_state *xvec[XFRM_MAX_DEPTH]; |
1036 | struct xfrm_offload ovec[XFRM_MAX_OFFLOAD_DEPTH]; |
1037 | }; |
1038 | |
1039 | struct sec_path *secpath_set(struct sk_buff *skb); |
1040 | |
1041 | static inline void |
1042 | secpath_reset(struct sk_buff *skb) |
1043 | { |
1044 | #ifdef CONFIG_XFRM |
1045 | skb_ext_del(skb, SKB_EXT_SEC_PATH); |
1046 | #endif |
1047 | } |
1048 | |
1049 | static inline int |
1050 | xfrm_addr_any(const xfrm_address_t *addr, unsigned short family) |
1051 | { |
1052 | switch (family) { |
1053 | case AF_INET: |
1054 | return addr->a4 == 0; |
1055 | case AF_INET6: |
1056 | return ipv6_addr_any(&addr->in6); |
1057 | } |
1058 | return 0; |
1059 | } |
1060 | |
1061 | static inline int |
1062 | __xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x) |
1063 | { |
1064 | return (tmpl->saddr.a4 && |
1065 | tmpl->saddr.a4 != x->props.saddr.a4); |
1066 | } |
1067 | |
1068 | static inline int |
1069 | __xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x) |
1070 | { |
1071 | return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) && |
1072 | !ipv6_addr_equal((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr)); |
1073 | } |
1074 | |
1075 | static inline int |
1076 | xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family) |
1077 | { |
1078 | switch (family) { |
1079 | case AF_INET: |
1080 | return __xfrm4_state_addr_cmp(tmpl, x); |
1081 | case AF_INET6: |
1082 | return __xfrm6_state_addr_cmp(tmpl, x); |
1083 | } |
1084 | return !0; |
1085 | } |
1086 | |
1087 | #ifdef CONFIG_XFRM |
1088 | int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, |
1089 | unsigned short family); |
1090 | |
1091 | static inline bool __xfrm_check_nopolicy(struct net *net, struct sk_buff *skb, |
1092 | int dir) |
1093 | { |
1094 | if (!net->xfrm.policy_count[dir] && !secpath_exists(skb)) |
1095 | return net->xfrm.policy_default[dir] == XFRM_USERPOLICY_ACCEPT; |
1096 | |
1097 | return false; |
1098 | } |
1099 | |
1100 | static inline bool __xfrm_check_dev_nopolicy(struct sk_buff *skb, |
1101 | int dir, unsigned short family) |
1102 | { |
1103 | if (dir != XFRM_POLICY_OUT && family == AF_INET) { |
1104 | /* same dst may be used for traffic originating from |
1105 | * devices with different policy settings. |
1106 | */ |
1107 | return IPCB(skb)->flags & IPSKB_NOPOLICY; |
1108 | } |
1109 | return skb_dst(skb) && (skb_dst(skb)->flags & DST_NOPOLICY); |
1110 | } |
1111 | |
1112 | static inline int __xfrm_policy_check2(struct sock *sk, int dir, |
1113 | struct sk_buff *skb, |
1114 | unsigned int family, int reverse) |
1115 | { |
1116 | struct net *net = dev_net(skb->dev); |
1117 | int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0); |
1118 | |
1119 | if (sk && sk->sk_policy[XFRM_POLICY_IN]) |
1120 | return __xfrm_policy_check(sk, ndir, skb, family); |
1121 | |
1122 | return __xfrm_check_nopolicy(net, skb, dir) || |
1123 | __xfrm_check_dev_nopolicy(skb, dir, family) || |
1124 | __xfrm_policy_check(sk, ndir, skb, family); |
1125 | } |
1126 | |
1127 | static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) |
1128 | { |
1129 | return __xfrm_policy_check2(sk, dir, skb, family, 0); |
1130 | } |
1131 | |
1132 | static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) |
1133 | { |
1134 | return xfrm_policy_check(sk, dir, skb, AF_INET); |
1135 | } |
1136 | |
1137 | static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) |
1138 | { |
1139 | return xfrm_policy_check(sk, dir, skb, AF_INET6); |
1140 | } |
1141 | |
1142 | static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir, |
1143 | struct sk_buff *skb) |
1144 | { |
1145 | return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1); |
1146 | } |
1147 | |
1148 | static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir, |
1149 | struct sk_buff *skb) |
1150 | { |
1151 | return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1); |
1152 | } |
1153 | |
1154 | int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, |
1155 | unsigned int family, int reverse); |
1156 | |
1157 | static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, |
1158 | unsigned int family) |
1159 | { |
1160 | return __xfrm_decode_session(skb, fl, family, 0); |
1161 | } |
1162 | |
1163 | static inline int xfrm_decode_session_reverse(struct sk_buff *skb, |
1164 | struct flowi *fl, |
1165 | unsigned int family) |
1166 | { |
1167 | return __xfrm_decode_session(skb, fl, family, 1); |
1168 | } |
1169 | |
1170 | int __xfrm_route_forward(struct sk_buff *skb, unsigned short family); |
1171 | |
1172 | static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family) |
1173 | { |
1174 | struct net *net = dev_net(skb->dev); |
1175 | |
1176 | if (!net->xfrm.policy_count[XFRM_POLICY_OUT] && |
1177 | net->xfrm.policy_default[XFRM_POLICY_OUT] == XFRM_USERPOLICY_ACCEPT) |
1178 | return true; |
1179 | |
1180 | return (skb_dst(skb)->flags & DST_NOXFRM) || |
1181 | __xfrm_route_forward(skb, family); |
1182 | } |
1183 | |
1184 | static inline int xfrm4_route_forward(struct sk_buff *skb) |
1185 | { |
1186 | return xfrm_route_forward(skb, AF_INET); |
1187 | } |
1188 | |
1189 | static inline int xfrm6_route_forward(struct sk_buff *skb) |
1190 | { |
1191 | return xfrm_route_forward(skb, AF_INET6); |
1192 | } |
1193 | |
1194 | int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk); |
1195 | |
1196 | static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) |
1197 | { |
1198 | if (!sk_fullsock(osk)) |
1199 | return 0; |
1200 | sk->sk_policy[0] = NULL; |
1201 | sk->sk_policy[1] = NULL; |
1202 | if (unlikely(osk->sk_policy[0] || osk->sk_policy[1])) |
1203 | return __xfrm_sk_clone_policy(sk, osk); |
1204 | return 0; |
1205 | } |
1206 | |
1207 | int xfrm_policy_delete(struct xfrm_policy *pol, int dir); |
1208 | |
1209 | static inline void xfrm_sk_free_policy(struct sock *sk) |
1210 | { |
1211 | struct xfrm_policy *pol; |
1212 | |
1213 | pol = rcu_dereference_protected(sk->sk_policy[0], 1); |
1214 | if (unlikely(pol != NULL)) { |
1215 | xfrm_policy_delete(pol, XFRM_POLICY_MAX); |
1216 | sk->sk_policy[0] = NULL; |
1217 | } |
1218 | pol = rcu_dereference_protected(sk->sk_policy[1], 1); |
1219 | if (unlikely(pol != NULL)) { |
1220 | xfrm_policy_delete(pol, XFRM_POLICY_MAX+1); |
1221 | sk->sk_policy[1] = NULL; |
1222 | } |
1223 | } |
1224 | |
1225 | #else |
1226 | |
1227 | static inline void xfrm_sk_free_policy(struct sock *sk) {} |
1228 | static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) { return 0; } |
1229 | static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; } |
1230 | static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; } |
1231 | static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) |
1232 | { |
1233 | return 1; |
1234 | } |
1235 | static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) |
1236 | { |
1237 | return 1; |
1238 | } |
1239 | static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) |
1240 | { |
1241 | return 1; |
1242 | } |
1243 | static inline int xfrm_decode_session_reverse(struct sk_buff *skb, |
1244 | struct flowi *fl, |
1245 | unsigned int family) |
1246 | { |
1247 | return -ENOSYS; |
1248 | } |
1249 | static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir, |
1250 | struct sk_buff *skb) |
1251 | { |
1252 | return 1; |
1253 | } |
1254 | static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir, |
1255 | struct sk_buff *skb) |
1256 | { |
1257 | return 1; |
1258 | } |
1259 | #endif |
1260 | |
1261 | static __inline__ |
1262 | xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family) |
1263 | { |
1264 | switch (family){ |
1265 | case AF_INET: |
1266 | return (xfrm_address_t *)&fl->u.ip4.daddr; |
1267 | case AF_INET6: |
1268 | return (xfrm_address_t *)&fl->u.ip6.daddr; |
1269 | } |
1270 | return NULL; |
1271 | } |
1272 | |
1273 | static __inline__ |
1274 | xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family) |
1275 | { |
1276 | switch (family){ |
1277 | case AF_INET: |
1278 | return (xfrm_address_t *)&fl->u.ip4.saddr; |
1279 | case AF_INET6: |
1280 | return (xfrm_address_t *)&fl->u.ip6.saddr; |
1281 | } |
1282 | return NULL; |
1283 | } |
1284 | |
1285 | static __inline__ |
1286 | void xfrm_flowi_addr_get(const struct flowi *fl, |
1287 | xfrm_address_t *saddr, xfrm_address_t *daddr, |
1288 | unsigned short family) |
1289 | { |
1290 | switch(family) { |
1291 | case AF_INET: |
1292 | memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4)); |
1293 | memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4)); |
1294 | break; |
1295 | case AF_INET6: |
1296 | saddr->in6 = fl->u.ip6.saddr; |
1297 | daddr->in6 = fl->u.ip6.daddr; |
1298 | break; |
1299 | } |
1300 | } |
1301 | |
1302 | static __inline__ int |
1303 | __xfrm4_state_addr_check(const struct xfrm_state *x, |
1304 | const xfrm_address_t *daddr, const xfrm_address_t *saddr) |
1305 | { |
1306 | if (daddr->a4 == x->id.daddr.a4 && |
1307 | (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4)) |
1308 | return 1; |
1309 | return 0; |
1310 | } |
1311 | |
1312 | static __inline__ int |
1313 | __xfrm6_state_addr_check(const struct xfrm_state *x, |
1314 | const xfrm_address_t *daddr, const xfrm_address_t *saddr) |
1315 | { |
1316 | if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) && |
1317 | (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) || |
1318 | ipv6_addr_any((struct in6_addr *)saddr) || |
1319 | ipv6_addr_any((struct in6_addr *)&x->props.saddr))) |
1320 | return 1; |
1321 | return 0; |
1322 | } |
1323 | |
1324 | static __inline__ int |
1325 | xfrm_state_addr_check(const struct xfrm_state *x, |
1326 | const xfrm_address_t *daddr, const xfrm_address_t *saddr, |
1327 | unsigned short family) |
1328 | { |
1329 | switch (family) { |
1330 | case AF_INET: |
1331 | return __xfrm4_state_addr_check(x, daddr, saddr); |
1332 | case AF_INET6: |
1333 | return __xfrm6_state_addr_check(x, daddr, saddr); |
1334 | } |
1335 | return 0; |
1336 | } |
1337 | |
1338 | static __inline__ int |
1339 | xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl, |
1340 | unsigned short family) |
1341 | { |
1342 | switch (family) { |
1343 | case AF_INET: |
1344 | return __xfrm4_state_addr_check(x, |
1345 | (const xfrm_address_t *)&fl->u.ip4.daddr, |
1346 | (const xfrm_address_t *)&fl->u.ip4.saddr); |
1347 | case AF_INET6: |
1348 | return __xfrm6_state_addr_check(x, |
1349 | (const xfrm_address_t *)&fl->u.ip6.daddr, |
1350 | (const xfrm_address_t *)&fl->u.ip6.saddr); |
1351 | } |
1352 | return 0; |
1353 | } |
1354 | |
1355 | static inline int xfrm_state_kern(const struct xfrm_state *x) |
1356 | { |
1357 | return atomic_read(&x->tunnel_users); |
1358 | } |
1359 | |
1360 | static inline bool xfrm_id_proto_valid(u8 proto) |
1361 | { |
1362 | switch (proto) { |
1363 | case IPPROTO_AH: |
1364 | case IPPROTO_ESP: |
1365 | case IPPROTO_COMP: |
1366 | #if IS_ENABLED(CONFIG_IPV6) |
1367 | case IPPROTO_ROUTING: |
1368 | case IPPROTO_DSTOPTS: |
1369 | #endif |
1370 | return true; |
1371 | default: |
1372 | return false; |
1373 | } |
1374 | } |
1375 | |
1376 | /* IPSEC_PROTO_ANY only matches 3 IPsec protocols, 0 could match all. */ |
1377 | static inline int xfrm_id_proto_match(u8 proto, u8 userproto) |
1378 | { |
1379 | return (!userproto || proto == userproto || |
1380 | (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH || |
1381 | proto == IPPROTO_ESP || |
1382 | proto == IPPROTO_COMP))); |
1383 | } |
1384 | |
1385 | /* |
1386 | * xfrm algorithm information |
1387 | */ |
1388 | struct xfrm_algo_aead_info { |
1389 | char *geniv; |
1390 | u16 icv_truncbits; |
1391 | }; |
1392 | |
1393 | struct xfrm_algo_auth_info { |
1394 | u16 icv_truncbits; |
1395 | u16 icv_fullbits; |
1396 | }; |
1397 | |
1398 | struct xfrm_algo_encr_info { |
1399 | char *geniv; |
1400 | u16 blockbits; |
1401 | u16 defkeybits; |
1402 | }; |
1403 | |
1404 | struct xfrm_algo_comp_info { |
1405 | u16 threshold; |
1406 | }; |
1407 | |
1408 | struct xfrm_algo_desc { |
1409 | char *name; |
1410 | char *compat; |
1411 | u8 available:1; |
1412 | u8 pfkey_supported:1; |
1413 | union { |
1414 | struct xfrm_algo_aead_info aead; |
1415 | struct xfrm_algo_auth_info auth; |
1416 | struct xfrm_algo_encr_info encr; |
1417 | struct xfrm_algo_comp_info comp; |
1418 | } uinfo; |
1419 | struct sadb_alg desc; |
1420 | }; |
1421 | |
1422 | /* XFRM protocol handlers. */ |
1423 | struct xfrm4_protocol { |
1424 | int (*handler)(struct sk_buff *skb); |
1425 | int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi, |
1426 | int encap_type); |
1427 | int (*cb_handler)(struct sk_buff *skb, int err); |
1428 | int (*err_handler)(struct sk_buff *skb, u32 info); |
1429 | |
1430 | struct xfrm4_protocol __rcu *next; |
1431 | int priority; |
1432 | }; |
1433 | |
1434 | struct xfrm6_protocol { |
1435 | int (*handler)(struct sk_buff *skb); |
1436 | int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi, |
1437 | int encap_type); |
1438 | int (*cb_handler)(struct sk_buff *skb, int err); |
1439 | int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt, |
1440 | u8 type, u8 code, int offset, __be32 info); |
1441 | |
1442 | struct xfrm6_protocol __rcu *next; |
1443 | int priority; |
1444 | }; |
1445 | |
1446 | /* XFRM tunnel handlers. */ |
1447 | struct xfrm_tunnel { |
1448 | int (*handler)(struct sk_buff *skb); |
1449 | int (*cb_handler)(struct sk_buff *skb, int err); |
1450 | int (*err_handler)(struct sk_buff *skb, u32 info); |
1451 | |
1452 | struct xfrm_tunnel __rcu *next; |
1453 | int priority; |
1454 | }; |
1455 | |
1456 | struct xfrm6_tunnel { |
1457 | int (*handler)(struct sk_buff *skb); |
1458 | int (*cb_handler)(struct sk_buff *skb, int err); |
1459 | int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt, |
1460 | u8 type, u8 code, int offset, __be32 info); |
1461 | struct xfrm6_tunnel __rcu *next; |
1462 | int priority; |
1463 | }; |
1464 | |
1465 | void xfrm_init(void); |
1466 | void xfrm4_init(void); |
1467 | int xfrm_state_init(struct net *net); |
1468 | void xfrm_state_fini(struct net *net); |
1469 | void xfrm4_state_init(void); |
1470 | void xfrm4_protocol_init(void); |
1471 | #ifdef CONFIG_XFRM |
1472 | int xfrm6_init(void); |
1473 | void xfrm6_fini(void); |
1474 | int xfrm6_state_init(void); |
1475 | void xfrm6_state_fini(void); |
1476 | int xfrm6_protocol_init(void); |
1477 | void xfrm6_protocol_fini(void); |
1478 | #else |
1479 | static inline int xfrm6_init(void) |
1480 | { |
1481 | return 0; |
1482 | } |
1483 | static inline void xfrm6_fini(void) |
1484 | { |
1485 | ; |
1486 | } |
1487 | #endif |
1488 | |
1489 | #ifdef CONFIG_XFRM_STATISTICS |
1490 | int xfrm_proc_init(struct net *net); |
1491 | void xfrm_proc_fini(struct net *net); |
1492 | #endif |
1493 | |
1494 | int xfrm_sysctl_init(struct net *net); |
1495 | #ifdef CONFIG_SYSCTL |
1496 | void xfrm_sysctl_fini(struct net *net); |
1497 | #else |
1498 | static inline void xfrm_sysctl_fini(struct net *net) |
1499 | { |
1500 | } |
1501 | #endif |
1502 | |
1503 | void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto, |
1504 | struct xfrm_address_filter *filter); |
1505 | int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk, |
1506 | int (*func)(struct xfrm_state *, int, void*), void *); |
1507 | void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net); |
1508 | struct xfrm_state *xfrm_state_alloc(struct net *net); |
1509 | void xfrm_state_free(struct xfrm_state *x); |
1510 | struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr, |
1511 | const xfrm_address_t *saddr, |
1512 | const struct flowi *fl, |
1513 | struct xfrm_tmpl *tmpl, |
1514 | struct xfrm_policy *pol, int *err, |
1515 | unsigned short family, u32 if_id); |
1516 | struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark, u32 if_id, |
1517 | xfrm_address_t *daddr, |
1518 | xfrm_address_t *saddr, |
1519 | unsigned short family, |
1520 | u8 mode, u8 proto, u32 reqid); |
1521 | struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi, |
1522 | unsigned short family); |
1523 | int xfrm_state_check_expire(struct xfrm_state *x); |
1524 | void xfrm_state_insert(struct xfrm_state *x); |
1525 | int xfrm_state_add(struct xfrm_state *x); |
1526 | int xfrm_state_update(struct xfrm_state *x); |
1527 | struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark, |
1528 | const xfrm_address_t *daddr, __be32 spi, |
1529 | u8 proto, unsigned short family); |
1530 | struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark, |
1531 | const xfrm_address_t *daddr, |
1532 | const xfrm_address_t *saddr, |
1533 | u8 proto, |
1534 | unsigned short family); |
1535 | #ifdef CONFIG_XFRM_SUB_POLICY |
1536 | void xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n, |
1537 | unsigned short family); |
1538 | void xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n, |
1539 | unsigned short family); |
1540 | #else |
1541 | static inline void xfrm_tmpl_sort(struct xfrm_tmpl **d, struct xfrm_tmpl **s, |
1542 | int n, unsigned short family) |
1543 | { |
1544 | } |
1545 | |
1546 | static inline void xfrm_state_sort(struct xfrm_state **d, struct xfrm_state **s, |
1547 | int n, unsigned short family) |
1548 | { |
1549 | } |
1550 | #endif |
1551 | |
1552 | struct xfrmk_sadinfo { |
1553 | u32 sadhcnt; /* current hash bkts */ |
1554 | u32 sadhmcnt; /* max allowed hash bkts */ |
1555 | u32 sadcnt; /* current running count */ |
1556 | }; |
1557 | |
1558 | struct xfrmk_spdinfo { |
1559 | u32 incnt; |
1560 | u32 outcnt; |
1561 | u32 fwdcnt; |
1562 | u32 inscnt; |
1563 | u32 outscnt; |
1564 | u32 fwdscnt; |
1565 | u32 spdhcnt; |
1566 | u32 spdhmcnt; |
1567 | }; |
1568 | |
1569 | struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq); |
1570 | int xfrm_state_delete(struct xfrm_state *x); |
1571 | int xfrm_state_flush(struct net *net, u8 proto, bool task_valid, bool sync); |
1572 | int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid); |
1573 | void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si); |
1574 | void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si); |
1575 | u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq); |
1576 | int xfrm_init_replay(struct xfrm_state *x); |
1577 | u32 xfrm_state_mtu(struct xfrm_state *x, int mtu); |
1578 | int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload); |
1579 | int xfrm_init_state(struct xfrm_state *x); |
1580 | int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type); |
1581 | int xfrm_input_resume(struct sk_buff *skb, int nexthdr); |
1582 | int xfrm_trans_queue_net(struct net *net, struct sk_buff *skb, |
1583 | int (*finish)(struct net *, struct sock *, |
1584 | struct sk_buff *)); |
1585 | int xfrm_trans_queue(struct sk_buff *skb, |
1586 | int (*finish)(struct net *, struct sock *, |
1587 | struct sk_buff *)); |
1588 | int xfrm_output_resume(struct sock *sk, struct sk_buff *skb, int err); |
1589 | int xfrm_output(struct sock *sk, struct sk_buff *skb); |
1590 | |
1591 | #if IS_ENABLED(CONFIG_NET_PKTGEN) |
1592 | int pktgen_xfrm_outer_mode_output(struct xfrm_state *x, struct sk_buff *skb); |
1593 | #endif |
1594 | |
1595 | void xfrm_local_error(struct sk_buff *skb, int mtu); |
1596 | int (struct xfrm_state *x, struct sk_buff *skb); |
1597 | int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi, |
1598 | int encap_type); |
1599 | int xfrm4_transport_finish(struct sk_buff *skb, int async); |
1600 | int xfrm4_rcv(struct sk_buff *skb); |
1601 | |
1602 | static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi) |
1603 | { |
1604 | XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL; |
1605 | XFRM_SPI_SKB_CB(skb)->family = AF_INET; |
1606 | XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr); |
1607 | return xfrm_input(skb, nexthdr, spi, 0); |
1608 | } |
1609 | |
1610 | int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb); |
1611 | int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol); |
1612 | int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol); |
1613 | int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family); |
1614 | int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family); |
1615 | void xfrm4_local_error(struct sk_buff *skb, u32 mtu); |
1616 | int (struct xfrm_state *x, struct sk_buff *skb); |
1617 | int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi, |
1618 | struct ip6_tnl *t); |
1619 | int xfrm6_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi, |
1620 | int encap_type); |
1621 | int xfrm6_transport_finish(struct sk_buff *skb, int async); |
1622 | int xfrm6_rcv_tnl(struct sk_buff *skb, struct ip6_tnl *t); |
1623 | int xfrm6_rcv(struct sk_buff *skb); |
1624 | int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr, |
1625 | xfrm_address_t *saddr, u8 proto); |
1626 | void xfrm6_local_error(struct sk_buff *skb, u32 mtu); |
1627 | int xfrm6_protocol_register(struct xfrm6_protocol *handler, unsigned char protocol); |
1628 | int xfrm6_protocol_deregister(struct xfrm6_protocol *handler, unsigned char protocol); |
1629 | int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family); |
1630 | int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family); |
1631 | __be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr); |
1632 | __be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr); |
1633 | int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb); |
1634 | |
1635 | #ifdef CONFIG_XFRM |
1636 | void xfrm6_local_rxpmtu(struct sk_buff *skb, u32 mtu); |
1637 | int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb); |
1638 | int xfrm6_udp_encap_rcv(struct sock *sk, struct sk_buff *skb); |
1639 | int xfrm_user_policy(struct sock *sk, int optname, sockptr_t optval, |
1640 | int optlen); |
1641 | #else |
1642 | static inline int xfrm_user_policy(struct sock *sk, int optname, |
1643 | sockptr_t optval, int optlen) |
1644 | { |
1645 | return -ENOPROTOOPT; |
1646 | } |
1647 | #endif |
1648 | |
1649 | struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, int oif, |
1650 | const xfrm_address_t *saddr, |
1651 | const xfrm_address_t *daddr, |
1652 | int family, u32 mark); |
1653 | |
1654 | struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp); |
1655 | |
1656 | void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type); |
1657 | int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk, |
1658 | int (*func)(struct xfrm_policy *, int, int, void*), |
1659 | void *); |
1660 | void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net); |
1661 | int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl); |
1662 | struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, |
1663 | const struct xfrm_mark *mark, |
1664 | u32 if_id, u8 type, int dir, |
1665 | struct xfrm_selector *sel, |
1666 | struct xfrm_sec_ctx *ctx, int delete, |
1667 | int *err); |
1668 | struct xfrm_policy *xfrm_policy_byid(struct net *net, |
1669 | const struct xfrm_mark *mark, u32 if_id, |
1670 | u8 type, int dir, u32 id, int delete, |
1671 | int *err); |
1672 | int xfrm_policy_flush(struct net *net, u8 type, bool task_valid); |
1673 | void xfrm_policy_hash_rebuild(struct net *net); |
1674 | u32 xfrm_get_acqseq(void); |
1675 | int verify_spi_info(u8 proto, u32 min, u32 max); |
1676 | int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi); |
1677 | struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark, |
1678 | u8 mode, u32 reqid, u32 if_id, u8 proto, |
1679 | const xfrm_address_t *daddr, |
1680 | const xfrm_address_t *saddr, int create, |
1681 | unsigned short family); |
1682 | int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol); |
1683 | |
1684 | #ifdef CONFIG_XFRM_MIGRATE |
1685 | int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, |
1686 | const struct xfrm_migrate *m, int num_bundles, |
1687 | const struct xfrm_kmaddress *k, |
1688 | const struct xfrm_encap_tmpl *encap); |
1689 | struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net, |
1690 | u32 if_id); |
1691 | struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x, |
1692 | struct xfrm_migrate *m, |
1693 | struct xfrm_encap_tmpl *encap); |
1694 | int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, |
1695 | struct xfrm_migrate *m, int num_bundles, |
1696 | struct xfrm_kmaddress *k, struct net *net, |
1697 | struct xfrm_encap_tmpl *encap, u32 if_id); |
1698 | #endif |
1699 | |
1700 | int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport); |
1701 | void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid); |
1702 | int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, |
1703 | xfrm_address_t *addr); |
1704 | |
1705 | void xfrm_input_init(void); |
1706 | int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq); |
1707 | |
1708 | void xfrm_probe_algs(void); |
1709 | int xfrm_count_pfkey_auth_supported(void); |
1710 | int xfrm_count_pfkey_enc_supported(void); |
1711 | struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx); |
1712 | struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx); |
1713 | struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id); |
1714 | struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id); |
1715 | struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id); |
1716 | struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe); |
1717 | struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe); |
1718 | struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe); |
1719 | struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len, |
1720 | int probe); |
1721 | |
1722 | static inline bool xfrm6_addr_equal(const xfrm_address_t *a, |
1723 | const xfrm_address_t *b) |
1724 | { |
1725 | return ipv6_addr_equal((const struct in6_addr *)a, |
1726 | (const struct in6_addr *)b); |
1727 | } |
1728 | |
1729 | static inline bool xfrm_addr_equal(const xfrm_address_t *a, |
1730 | const xfrm_address_t *b, |
1731 | sa_family_t family) |
1732 | { |
1733 | switch (family) { |
1734 | default: |
1735 | case AF_INET: |
1736 | return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0; |
1737 | case AF_INET6: |
1738 | return xfrm6_addr_equal(a, b); |
1739 | } |
1740 | } |
1741 | |
1742 | static inline int xfrm_policy_id2dir(u32 index) |
1743 | { |
1744 | return index & 7; |
1745 | } |
1746 | |
1747 | #ifdef CONFIG_XFRM |
1748 | void xfrm_replay_advance(struct xfrm_state *x, __be32 net_seq); |
1749 | int xfrm_replay_check(struct xfrm_state *x, struct sk_buff *skb, __be32 net_seq); |
1750 | void xfrm_replay_notify(struct xfrm_state *x, int event); |
1751 | int xfrm_replay_overflow(struct xfrm_state *x, struct sk_buff *skb); |
1752 | int xfrm_replay_recheck(struct xfrm_state *x, struct sk_buff *skb, __be32 net_seq); |
1753 | |
1754 | static inline int xfrm_aevent_is_on(struct net *net) |
1755 | { |
1756 | struct sock *nlsk; |
1757 | int ret = 0; |
1758 | |
1759 | rcu_read_lock(); |
1760 | nlsk = rcu_dereference(net->xfrm.nlsk); |
1761 | if (nlsk) |
1762 | ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS); |
1763 | rcu_read_unlock(); |
1764 | return ret; |
1765 | } |
1766 | |
1767 | static inline int xfrm_acquire_is_on(struct net *net) |
1768 | { |
1769 | struct sock *nlsk; |
1770 | int ret = 0; |
1771 | |
1772 | rcu_read_lock(); |
1773 | nlsk = rcu_dereference(net->xfrm.nlsk); |
1774 | if (nlsk) |
1775 | ret = netlink_has_listeners(nlsk, XFRMNLGRP_ACQUIRE); |
1776 | rcu_read_unlock(); |
1777 | |
1778 | return ret; |
1779 | } |
1780 | #endif |
1781 | |
1782 | static inline unsigned int aead_len(struct xfrm_algo_aead *alg) |
1783 | { |
1784 | return sizeof(*alg) + ((alg->alg_key_len + 7) / 8); |
1785 | } |
1786 | |
1787 | static inline unsigned int xfrm_alg_len(const struct xfrm_algo *alg) |
1788 | { |
1789 | return sizeof(*alg) + ((alg->alg_key_len + 7) / 8); |
1790 | } |
1791 | |
1792 | static inline unsigned int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg) |
1793 | { |
1794 | return sizeof(*alg) + ((alg->alg_key_len + 7) / 8); |
1795 | } |
1796 | |
1797 | static inline unsigned int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn) |
1798 | { |
1799 | return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32); |
1800 | } |
1801 | |
1802 | #ifdef CONFIG_XFRM_MIGRATE |
1803 | static inline int xfrm_replay_clone(struct xfrm_state *x, |
1804 | struct xfrm_state *orig) |
1805 | { |
1806 | |
1807 | x->replay_esn = kmemdup(orig->replay_esn, |
1808 | xfrm_replay_state_esn_len(orig->replay_esn), |
1809 | GFP_KERNEL); |
1810 | if (!x->replay_esn) |
1811 | return -ENOMEM; |
1812 | x->preplay_esn = kmemdup(orig->preplay_esn, |
1813 | xfrm_replay_state_esn_len(orig->preplay_esn), |
1814 | GFP_KERNEL); |
1815 | if (!x->preplay_esn) |
1816 | return -ENOMEM; |
1817 | |
1818 | return 0; |
1819 | } |
1820 | |
1821 | static inline struct xfrm_algo_aead *xfrm_algo_aead_clone(struct xfrm_algo_aead *orig) |
1822 | { |
1823 | return kmemdup(orig, aead_len(orig), GFP_KERNEL); |
1824 | } |
1825 | |
1826 | |
1827 | static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig) |
1828 | { |
1829 | return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL); |
1830 | } |
1831 | |
1832 | static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig) |
1833 | { |
1834 | return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL); |
1835 | } |
1836 | |
1837 | static inline void xfrm_states_put(struct xfrm_state **states, int n) |
1838 | { |
1839 | int i; |
1840 | for (i = 0; i < n; i++) |
1841 | xfrm_state_put(*(states + i)); |
1842 | } |
1843 | |
1844 | static inline void xfrm_states_delete(struct xfrm_state **states, int n) |
1845 | { |
1846 | int i; |
1847 | for (i = 0; i < n; i++) |
1848 | xfrm_state_delete(*(states + i)); |
1849 | } |
1850 | #endif |
1851 | |
1852 | #ifdef CONFIG_XFRM |
1853 | static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb) |
1854 | { |
1855 | struct sec_path *sp = skb_sec_path(skb); |
1856 | |
1857 | return sp->xvec[sp->len - 1]; |
1858 | } |
1859 | #endif |
1860 | |
1861 | static inline struct xfrm_offload *xfrm_offload(struct sk_buff *skb) |
1862 | { |
1863 | #ifdef CONFIG_XFRM |
1864 | struct sec_path *sp = skb_sec_path(skb); |
1865 | |
1866 | if (!sp || !sp->olen || sp->len != sp->olen) |
1867 | return NULL; |
1868 | |
1869 | return &sp->ovec[sp->olen - 1]; |
1870 | #else |
1871 | return NULL; |
1872 | #endif |
1873 | } |
1874 | |
1875 | void __init xfrm_dev_init(void); |
1876 | |
1877 | #ifdef CONFIG_XFRM_OFFLOAD |
1878 | void xfrm_dev_resume(struct sk_buff *skb); |
1879 | void xfrm_dev_backlog(struct softnet_data *sd); |
1880 | struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again); |
1881 | int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, |
1882 | struct xfrm_user_offload *xuo); |
1883 | bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x); |
1884 | |
1885 | static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x) |
1886 | { |
1887 | struct xfrm_dev_offload *xso = &x->xso; |
1888 | |
1889 | if (xso->dev && xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn) |
1890 | xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn(x); |
1891 | } |
1892 | |
1893 | static inline bool xfrm_dst_offload_ok(struct dst_entry *dst) |
1894 | { |
1895 | struct xfrm_state *x = dst->xfrm; |
1896 | struct xfrm_dst *xdst; |
1897 | |
1898 | if (!x || !x->type_offload) |
1899 | return false; |
1900 | |
1901 | xdst = (struct xfrm_dst *) dst; |
1902 | if (!x->xso.offload_handle && !xdst->child->xfrm) |
1903 | return true; |
1904 | if (x->xso.offload_handle && (x->xso.dev == xfrm_dst_path(dst)->dev) && |
1905 | !xdst->child->xfrm) |
1906 | return true; |
1907 | |
1908 | return false; |
1909 | } |
1910 | |
1911 | static inline void xfrm_dev_state_delete(struct xfrm_state *x) |
1912 | { |
1913 | struct xfrm_dev_offload *xso = &x->xso; |
1914 | |
1915 | if (xso->dev) |
1916 | xso->dev->xfrmdev_ops->xdo_dev_state_delete(x); |
1917 | } |
1918 | |
1919 | static inline void xfrm_dev_state_free(struct xfrm_state *x) |
1920 | { |
1921 | struct xfrm_dev_offload *xso = &x->xso; |
1922 | struct net_device *dev = xso->dev; |
1923 | |
1924 | if (dev && dev->xfrmdev_ops) { |
1925 | if (dev->xfrmdev_ops->xdo_dev_state_free) |
1926 | dev->xfrmdev_ops->xdo_dev_state_free(x); |
1927 | xso->dev = NULL; |
1928 | netdev_put(dev, &xso->dev_tracker); |
1929 | } |
1930 | } |
1931 | #else |
1932 | static inline void xfrm_dev_resume(struct sk_buff *skb) |
1933 | { |
1934 | } |
1935 | |
1936 | static inline void xfrm_dev_backlog(struct softnet_data *sd) |
1937 | { |
1938 | } |
1939 | |
1940 | static inline struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again) |
1941 | { |
1942 | return skb; |
1943 | } |
1944 | |
1945 | static inline int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, struct xfrm_user_offload *xuo) |
1946 | { |
1947 | return 0; |
1948 | } |
1949 | |
1950 | static inline void xfrm_dev_state_delete(struct xfrm_state *x) |
1951 | { |
1952 | } |
1953 | |
1954 | static inline void xfrm_dev_state_free(struct xfrm_state *x) |
1955 | { |
1956 | } |
1957 | |
1958 | static inline bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x) |
1959 | { |
1960 | return false; |
1961 | } |
1962 | |
1963 | static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x) |
1964 | { |
1965 | } |
1966 | |
1967 | static inline bool xfrm_dst_offload_ok(struct dst_entry *dst) |
1968 | { |
1969 | return false; |
1970 | } |
1971 | #endif |
1972 | |
1973 | static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m) |
1974 | { |
1975 | if (attrs[XFRMA_MARK]) |
1976 | memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark)); |
1977 | else |
1978 | m->v = m->m = 0; |
1979 | |
1980 | return m->v & m->m; |
1981 | } |
1982 | |
1983 | static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m) |
1984 | { |
1985 | int ret = 0; |
1986 | |
1987 | if (m->m | m->v) |
1988 | ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m); |
1989 | return ret; |
1990 | } |
1991 | |
1992 | static inline __u32 xfrm_smark_get(__u32 mark, struct xfrm_state *x) |
1993 | { |
1994 | struct xfrm_mark *m = &x->props.smark; |
1995 | |
1996 | return (m->v & m->m) | (mark & ~m->m); |
1997 | } |
1998 | |
1999 | static inline int xfrm_if_id_put(struct sk_buff *skb, __u32 if_id) |
2000 | { |
2001 | int ret = 0; |
2002 | |
2003 | if (if_id) |
2004 | ret = nla_put_u32(skb, XFRMA_IF_ID, if_id); |
2005 | return ret; |
2006 | } |
2007 | |
2008 | static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x, |
2009 | unsigned int family) |
2010 | { |
2011 | bool tunnel = false; |
2012 | |
2013 | switch(family) { |
2014 | case AF_INET: |
2015 | if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4) |
2016 | tunnel = true; |
2017 | break; |
2018 | case AF_INET6: |
2019 | if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6) |
2020 | tunnel = true; |
2021 | break; |
2022 | } |
2023 | if (tunnel && !(x->outer_mode.flags & XFRM_MODE_FLAG_TUNNEL)) |
2024 | return -EINVAL; |
2025 | |
2026 | return 0; |
2027 | } |
2028 | |
2029 | extern const int xfrm_msg_min[XFRM_NR_MSGTYPES]; |
2030 | extern const struct nla_policy xfrma_policy[XFRMA_MAX+1]; |
2031 | |
2032 | struct xfrm_translator { |
2033 | /* Allocate frag_list and put compat translation there */ |
2034 | int (*alloc_compat)(struct sk_buff *skb, const struct nlmsghdr *src); |
2035 | |
2036 | /* Allocate nlmsg with 64-bit translaton of received 32-bit message */ |
2037 | struct nlmsghdr *(*rcv_msg_compat)(const struct nlmsghdr *nlh, |
2038 | int maxtype, const struct nla_policy *policy, |
2039 | struct netlink_ext_ack *extack); |
2040 | |
2041 | /* Translate 32-bit user_policy from sockptr */ |
2042 | int (*xlate_user_policy_sockptr)(u8 **pdata32, int optlen); |
2043 | |
2044 | struct module *owner; |
2045 | }; |
2046 | |
2047 | #if IS_ENABLED(CONFIG_XFRM_USER_COMPAT) |
2048 | extern int xfrm_register_translator(struct xfrm_translator *xtr); |
2049 | extern int xfrm_unregister_translator(struct xfrm_translator *xtr); |
2050 | extern struct xfrm_translator *xfrm_get_translator(void); |
2051 | extern void xfrm_put_translator(struct xfrm_translator *xtr); |
2052 | #else |
2053 | static inline struct xfrm_translator *xfrm_get_translator(void) |
2054 | { |
2055 | return NULL; |
2056 | } |
2057 | static inline void xfrm_put_translator(struct xfrm_translator *xtr) |
2058 | { |
2059 | } |
2060 | #endif |
2061 | |
2062 | #if IS_ENABLED(CONFIG_IPV6) |
2063 | static inline bool xfrm6_local_dontfrag(const struct sock *sk) |
2064 | { |
2065 | int proto; |
2066 | |
2067 | if (!sk || sk->sk_family != AF_INET6) |
2068 | return false; |
2069 | |
2070 | proto = sk->sk_protocol; |
2071 | if (proto == IPPROTO_UDP || proto == IPPROTO_RAW) |
2072 | return inet6_sk(sk)->dontfrag; |
2073 | |
2074 | return false; |
2075 | } |
2076 | #endif |
2077 | #endif /* _NET_XFRM_H */ |
2078 | |