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 struct xfrm_state_offload {
130 struct net_device *dev;
131 struct net_device *real_dev;
132 unsigned long offload_handle;
133 unsigned int num_exthdrs;
134 u8 flags;
135 };
136
137 struct xfrm_mode {
138 u8 encap;
139 u8 family;
140 u8 flags;
141 };
142
143 /* Flags for xfrm_mode. */
144 enum {
145 XFRM_MODE_FLAG_TUNNEL = 1,
146 };
147
148 enum xfrm_replay_mode {
149 XFRM_REPLAY_MODE_LEGACY,
150 XFRM_REPLAY_MODE_BMP,
151 XFRM_REPLAY_MODE_ESN,
152 };
153
154 /* Full description of state of transformer. */
155 struct xfrm_state {
156 possible_net_t xs_net;
157 union {
158 struct hlist_node gclist;
159 struct hlist_node bydst;
160 };
161 struct hlist_node bysrc;
162 struct hlist_node byspi;
163 struct hlist_node byseq;
164
165 refcount_t refcnt;
166 spinlock_t lock;
167
168 struct xfrm_id id;
169 struct xfrm_selector sel;
170 struct xfrm_mark mark;
171 u32 if_id;
172 u32 tfcpad;
173
174 u32 genid;
175
176 /* Key manager bits */
177 struct xfrm_state_walk km;
178
179 /* Parameters of this state. */
180 struct {
181 u32 reqid;
182 u8 mode;
183 u8 replay_window;
184 u8 aalgo, ealgo, calgo;
185 u8 flags;
186 u16 family;
187 xfrm_address_t saddr;
188 int header_len;
189 int trailer_len;
190 u32 extra_flags;
191 struct xfrm_mark smark;
192 } props;
193
194 struct xfrm_lifetime_cfg lft;
195
196 /* Data for transformer */
197 struct xfrm_algo_auth *aalg;
198 struct xfrm_algo *ealg;
199 struct xfrm_algo *calg;
200 struct xfrm_algo_aead *aead;
201 const char *geniv;
202
203 /* mapping change rate limiting */
204 __be16 new_mapping_sport;
205 u32 new_mapping; /* seconds */
206 u32 mapping_maxage; /* seconds for input SA */
207
208 /* Data for encapsulator */
209 struct xfrm_encap_tmpl *encap;
210 struct sock __rcu *encap_sk;
211
212 /* Data for care-of address */
213 xfrm_address_t *coaddr;
214
215 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
216 struct xfrm_state *tunnel;
217
218 /* If a tunnel, number of users + 1 */
219 atomic_t tunnel_users;
220
221 /* State for replay detection */
222 struct xfrm_replay_state replay;
223 struct xfrm_replay_state_esn *replay_esn;
224
225 /* Replay detection state at the time we sent the last notification */
226 struct xfrm_replay_state preplay;
227 struct xfrm_replay_state_esn *preplay_esn;
228
229 /* replay detection mode */
230 enum xfrm_replay_mode repl_mode;
231 /* internal flag that only holds state for delayed aevent at the
232 * moment
233 */
234 u32 xflags;
235
236 /* Replay detection notification settings */
237 u32 replay_maxage;
238 u32 replay_maxdiff;
239
240 /* Replay detection notification timer */
241 struct timer_list rtimer;
242
243 /* Statistics */
244 struct xfrm_stats stats;
245
246 struct xfrm_lifetime_cur curlft;
247 struct hrtimer mtimer;
248
249 struct xfrm_state_offload xso;
250
251 /* used to fix curlft->add_time when changing date */
252 long saved_tmo;
253
254 /* Last used time */
255 time64_t lastused;
256
257 struct page_frag xfrag;
258
259 /* Reference to data common to all the instances of this
260 * transformer. */
261 const struct xfrm_type *type;
262 struct xfrm_mode inner_mode;
263 struct xfrm_mode inner_mode_iaf;
264 struct xfrm_mode outer_mode;
265
266 const struct xfrm_type_offload *type_offload;
267
268 /* Security context */
269 struct xfrm_sec_ctx *security;
270
271 /* Private data of this transformer, format is opaque,
272 * interpreted by xfrm_type methods. */
273 void *data;
274 };
275
xs_net(struct xfrm_state * x)276 static inline struct net *xs_net(struct xfrm_state *x)
277 {
278 return read_pnet(&x->xs_net);
279 }
280
281 /* xflags - make enum if more show up */
282 #define XFRM_TIME_DEFER 1
283 #define XFRM_SOFT_EXPIRE 2
284
285 enum {
286 XFRM_STATE_VOID,
287 XFRM_STATE_ACQ,
288 XFRM_STATE_VALID,
289 XFRM_STATE_ERROR,
290 XFRM_STATE_EXPIRED,
291 XFRM_STATE_DEAD
292 };
293
294 /* callback structure passed from either netlink or pfkey */
295 struct km_event {
296 union {
297 u32 hard;
298 u32 proto;
299 u32 byid;
300 u32 aevent;
301 u32 type;
302 } data;
303
304 u32 seq;
305 u32 portid;
306 u32 event;
307 struct net *net;
308 };
309
310 struct xfrm_if_cb {
311 struct xfrm_if *(*decode_session)(struct sk_buff *skb,
312 unsigned short family);
313 };
314
315 void xfrm_if_register_cb(const struct xfrm_if_cb *ifcb);
316 void xfrm_if_unregister_cb(void);
317
318 struct net_device;
319 struct xfrm_type;
320 struct xfrm_dst;
321 struct xfrm_policy_afinfo {
322 struct dst_ops *dst_ops;
323 struct dst_entry *(*dst_lookup)(struct net *net,
324 int tos, int oif,
325 const xfrm_address_t *saddr,
326 const xfrm_address_t *daddr,
327 u32 mark);
328 int (*get_saddr)(struct net *net, int oif,
329 xfrm_address_t *saddr,
330 xfrm_address_t *daddr,
331 u32 mark);
332 int (*fill_dst)(struct xfrm_dst *xdst,
333 struct net_device *dev,
334 const struct flowi *fl);
335 struct dst_entry *(*blackhole_route)(struct net *net, struct dst_entry *orig);
336 };
337
338 int xfrm_policy_register_afinfo(const struct xfrm_policy_afinfo *afinfo, int family);
339 void xfrm_policy_unregister_afinfo(const struct xfrm_policy_afinfo *afinfo);
340 void km_policy_notify(struct xfrm_policy *xp, int dir,
341 const struct km_event *c);
342 void km_state_notify(struct xfrm_state *x, const struct km_event *c);
343
344 struct xfrm_tmpl;
345 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t,
346 struct xfrm_policy *pol);
347 void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
348 int __xfrm_state_delete(struct xfrm_state *x);
349
350 struct xfrm_state_afinfo {
351 u8 family;
352 u8 proto;
353
354 const struct xfrm_type_offload *type_offload_esp;
355
356 const struct xfrm_type *type_esp;
357 const struct xfrm_type *type_ipip;
358 const struct xfrm_type *type_ipip6;
359 const struct xfrm_type *type_comp;
360 const struct xfrm_type *type_ah;
361 const struct xfrm_type *type_routing;
362 const struct xfrm_type *type_dstopts;
363
364 int (*output)(struct net *net, struct sock *sk, struct sk_buff *skb);
365 int (*transport_finish)(struct sk_buff *skb,
366 int async);
367 void (*local_error)(struct sk_buff *skb, u32 mtu);
368 };
369
370 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
371 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
372 struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family);
373 struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family);
374
375 struct xfrm_input_afinfo {
376 u8 family;
377 bool is_ipip;
378 int (*callback)(struct sk_buff *skb, u8 protocol,
379 int err);
380 };
381
382 int xfrm_input_register_afinfo(const struct xfrm_input_afinfo *afinfo);
383 int xfrm_input_unregister_afinfo(const struct xfrm_input_afinfo *afinfo);
384
385 void xfrm_flush_gc(void);
386 void xfrm_state_delete_tunnel(struct xfrm_state *x);
387
388 struct xfrm_type {
389 struct module *owner;
390 u8 proto;
391 u8 flags;
392 #define XFRM_TYPE_NON_FRAGMENT 1
393 #define XFRM_TYPE_REPLAY_PROT 2
394 #define XFRM_TYPE_LOCAL_COADDR 4
395 #define XFRM_TYPE_REMOTE_COADDR 8
396
397 int (*init_state)(struct xfrm_state *x);
398 void (*destructor)(struct xfrm_state *);
399 int (*input)(struct xfrm_state *, struct sk_buff *skb);
400 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
401 int (*reject)(struct xfrm_state *, struct sk_buff *,
402 const struct flowi *);
403 };
404
405 int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
406 void xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
407
408 struct xfrm_type_offload {
409 struct module *owner;
410 u8 proto;
411 void (*encap)(struct xfrm_state *, struct sk_buff *pskb);
412 int (*input_tail)(struct xfrm_state *x, struct sk_buff *skb);
413 int (*xmit)(struct xfrm_state *, struct sk_buff *pskb, netdev_features_t features);
414 };
415
416 int xfrm_register_type_offload(const struct xfrm_type_offload *type, unsigned short family);
417 void xfrm_unregister_type_offload(const struct xfrm_type_offload *type, unsigned short family);
418
xfrm_af2proto(unsigned int family)419 static inline int xfrm_af2proto(unsigned int family)
420 {
421 switch(family) {
422 case AF_INET:
423 return IPPROTO_IPIP;
424 case AF_INET6:
425 return IPPROTO_IPV6;
426 default:
427 return 0;
428 }
429 }
430
xfrm_ip2inner_mode(struct xfrm_state * x,int ipproto)431 static inline const struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
432 {
433 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
434 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
435 return &x->inner_mode;
436 else
437 return &x->inner_mode_iaf;
438 }
439
440 struct xfrm_tmpl {
441 /* id in template is interpreted as:
442 * daddr - destination of tunnel, may be zero for transport mode.
443 * spi - zero to acquire spi. Not zero if spi is static, then
444 * daddr must be fixed too.
445 * proto - AH/ESP/IPCOMP
446 */
447 struct xfrm_id id;
448
449 /* Source address of tunnel. Ignored, if it is not a tunnel. */
450 xfrm_address_t saddr;
451
452 unsigned short encap_family;
453
454 u32 reqid;
455
456 /* Mode: transport, tunnel etc. */
457 u8 mode;
458
459 /* Sharing mode: unique, this session only, this user only etc. */
460 u8 share;
461
462 /* May skip this transfomration if no SA is found */
463 u8 optional;
464
465 /* Skip aalgos/ealgos/calgos checks. */
466 u8 allalgs;
467
468 /* Bit mask of algos allowed for acquisition */
469 u32 aalgos;
470 u32 ealgos;
471 u32 calgos;
472 };
473
474 #define XFRM_MAX_DEPTH 6
475 #define XFRM_MAX_OFFLOAD_DEPTH 1
476
477 struct xfrm_policy_walk_entry {
478 struct list_head all;
479 u8 dead;
480 };
481
482 struct xfrm_policy_walk {
483 struct xfrm_policy_walk_entry walk;
484 u8 type;
485 u32 seq;
486 };
487
488 struct xfrm_policy_queue {
489 struct sk_buff_head hold_queue;
490 struct timer_list hold_timer;
491 unsigned long timeout;
492 };
493
494 struct xfrm_policy {
495 possible_net_t xp_net;
496 struct hlist_node bydst;
497 struct hlist_node byidx;
498
499 /* This lock only affects elements except for entry. */
500 rwlock_t lock;
501 refcount_t refcnt;
502 u32 pos;
503 struct timer_list timer;
504
505 atomic_t genid;
506 u32 priority;
507 u32 index;
508 u32 if_id;
509 struct xfrm_mark mark;
510 struct xfrm_selector selector;
511 struct xfrm_lifetime_cfg lft;
512 struct xfrm_lifetime_cur curlft;
513 struct xfrm_policy_walk_entry walk;
514 struct xfrm_policy_queue polq;
515 bool bydst_reinsert;
516 u8 type;
517 u8 action;
518 u8 flags;
519 u8 xfrm_nr;
520 u16 family;
521 struct xfrm_sec_ctx *security;
522 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
523 struct hlist_node bydst_inexact_list;
524 struct rcu_head rcu;
525 };
526
xp_net(const struct xfrm_policy * xp)527 static inline struct net *xp_net(const struct xfrm_policy *xp)
528 {
529 return read_pnet(&xp->xp_net);
530 }
531
532 struct xfrm_kmaddress {
533 xfrm_address_t local;
534 xfrm_address_t remote;
535 u32 reserved;
536 u16 family;
537 };
538
539 struct xfrm_migrate {
540 xfrm_address_t old_daddr;
541 xfrm_address_t old_saddr;
542 xfrm_address_t new_daddr;
543 xfrm_address_t new_saddr;
544 u8 proto;
545 u8 mode;
546 u16 reserved;
547 u32 reqid;
548 u16 old_family;
549 u16 new_family;
550 };
551
552 #define XFRM_KM_TIMEOUT 30
553 /* what happened */
554 #define XFRM_REPLAY_UPDATE XFRM_AE_CR
555 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
556
557 /* default aevent timeout in units of 100ms */
558 #define XFRM_AE_ETIME 10
559 /* Async Event timer multiplier */
560 #define XFRM_AE_ETH_M 10
561 /* default seq threshold size */
562 #define XFRM_AE_SEQT_SIZE 2
563
564 struct xfrm_mgr {
565 struct list_head list;
566 int (*notify)(struct xfrm_state *x, const struct km_event *c);
567 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp);
568 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
569 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
570 int (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c);
571 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
572 int (*migrate)(const struct xfrm_selector *sel,
573 u8 dir, u8 type,
574 const struct xfrm_migrate *m,
575 int num_bundles,
576 const struct xfrm_kmaddress *k,
577 const struct xfrm_encap_tmpl *encap);
578 bool (*is_alive)(const struct km_event *c);
579 };
580
581 int xfrm_register_km(struct xfrm_mgr *km);
582 int xfrm_unregister_km(struct xfrm_mgr *km);
583
584 struct xfrm_tunnel_skb_cb {
585 union {
586 struct inet_skb_parm h4;
587 struct inet6_skb_parm h6;
588 } header;
589
590 union {
591 struct ip_tunnel *ip4;
592 struct ip6_tnl *ip6;
593 } tunnel;
594 };
595
596 #define XFRM_TUNNEL_SKB_CB(__skb) ((struct xfrm_tunnel_skb_cb *)&((__skb)->cb[0]))
597
598 /*
599 * This structure is used for the duration where packets are being
600 * transformed by IPsec. As soon as the packet leaves IPsec the
601 * area beyond the generic IP part may be overwritten.
602 */
603 struct xfrm_skb_cb {
604 struct xfrm_tunnel_skb_cb header;
605
606 /* Sequence number for replay protection. */
607 union {
608 struct {
609 __u32 low;
610 __u32 hi;
611 } output;
612 struct {
613 __be32 low;
614 __be32 hi;
615 } input;
616 } seq;
617 };
618
619 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
620
621 /*
622 * This structure is used by the afinfo prepare_input/prepare_output functions
623 * to transmit header information to the mode input/output functions.
624 */
625 struct xfrm_mode_skb_cb {
626 struct xfrm_tunnel_skb_cb header;
627
628 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
629 __be16 id;
630 __be16 frag_off;
631
632 /* IP header length (excluding options or extension headers). */
633 u8 ihl;
634
635 /* TOS for IPv4, class for IPv6. */
636 u8 tos;
637
638 /* TTL for IPv4, hop limitfor IPv6. */
639 u8 ttl;
640
641 /* Protocol for IPv4, NH for IPv6. */
642 u8 protocol;
643
644 /* Option length for IPv4, zero for IPv6. */
645 u8 optlen;
646
647 /* Used by IPv6 only, zero for IPv4. */
648 u8 flow_lbl[3];
649 };
650
651 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
652
653 /*
654 * This structure is used by the input processing to locate the SPI and
655 * related information.
656 */
657 struct xfrm_spi_skb_cb {
658 struct xfrm_tunnel_skb_cb header;
659
660 unsigned int daddroff;
661 unsigned int family;
662 __be32 seq;
663 };
664
665 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
666
667 #ifdef CONFIG_AUDITSYSCALL
xfrm_audit_start(const char * op)668 static inline struct audit_buffer *xfrm_audit_start(const char *op)
669 {
670 struct audit_buffer *audit_buf = NULL;
671
672 if (audit_enabled == AUDIT_OFF)
673 return NULL;
674 audit_buf = audit_log_start(audit_context(), GFP_ATOMIC,
675 AUDIT_MAC_IPSEC_EVENT);
676 if (audit_buf == NULL)
677 return NULL;
678 audit_log_format(audit_buf, "op=%s", op);
679 return audit_buf;
680 }
681
xfrm_audit_helper_usrinfo(bool task_valid,struct audit_buffer * audit_buf)682 static inline void xfrm_audit_helper_usrinfo(bool task_valid,
683 struct audit_buffer *audit_buf)
684 {
685 const unsigned int auid = from_kuid(&init_user_ns, task_valid ?
686 audit_get_loginuid(current) :
687 INVALID_UID);
688 const unsigned int ses = task_valid ? audit_get_sessionid(current) :
689 AUDIT_SID_UNSET;
690
691 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
692 audit_log_task_context(audit_buf);
693 }
694
695 void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid);
696 void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
697 bool task_valid);
698 void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid);
699 void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid);
700 void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
701 struct sk_buff *skb);
702 void xfrm_audit_state_replay(struct xfrm_state *x, struct sk_buff *skb,
703 __be32 net_seq);
704 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
705 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, __be32 net_spi,
706 __be32 net_seq);
707 void xfrm_audit_state_icvfail(struct xfrm_state *x, struct sk_buff *skb,
708 u8 proto);
709 #else
710
xfrm_audit_policy_add(struct xfrm_policy * xp,int result,bool task_valid)711 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
712 bool task_valid)
713 {
714 }
715
xfrm_audit_policy_delete(struct xfrm_policy * xp,int result,bool task_valid)716 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
717 bool task_valid)
718 {
719 }
720
xfrm_audit_state_add(struct xfrm_state * x,int result,bool task_valid)721 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
722 bool task_valid)
723 {
724 }
725
xfrm_audit_state_delete(struct xfrm_state * x,int result,bool task_valid)726 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
727 bool task_valid)
728 {
729 }
730
xfrm_audit_state_replay_overflow(struct xfrm_state * x,struct sk_buff * skb)731 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
732 struct sk_buff *skb)
733 {
734 }
735
xfrm_audit_state_replay(struct xfrm_state * x,struct sk_buff * skb,__be32 net_seq)736 static inline void xfrm_audit_state_replay(struct xfrm_state *x,
737 struct sk_buff *skb, __be32 net_seq)
738 {
739 }
740
xfrm_audit_state_notfound_simple(struct sk_buff * skb,u16 family)741 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
742 u16 family)
743 {
744 }
745
xfrm_audit_state_notfound(struct sk_buff * skb,u16 family,__be32 net_spi,__be32 net_seq)746 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
747 __be32 net_spi, __be32 net_seq)
748 {
749 }
750
xfrm_audit_state_icvfail(struct xfrm_state * x,struct sk_buff * skb,u8 proto)751 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
752 struct sk_buff *skb, u8 proto)
753 {
754 }
755 #endif /* CONFIG_AUDITSYSCALL */
756
xfrm_pol_hold(struct xfrm_policy * policy)757 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
758 {
759 if (likely(policy != NULL))
760 refcount_inc(&policy->refcnt);
761 }
762
763 void xfrm_policy_destroy(struct xfrm_policy *policy);
764
xfrm_pol_put(struct xfrm_policy * policy)765 static inline void xfrm_pol_put(struct xfrm_policy *policy)
766 {
767 if (refcount_dec_and_test(&policy->refcnt))
768 xfrm_policy_destroy(policy);
769 }
770
xfrm_pols_put(struct xfrm_policy ** pols,int npols)771 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
772 {
773 int i;
774 for (i = npols - 1; i >= 0; --i)
775 xfrm_pol_put(pols[i]);
776 }
777
778 void __xfrm_state_destroy(struct xfrm_state *, bool);
779
__xfrm_state_put(struct xfrm_state * x)780 static inline void __xfrm_state_put(struct xfrm_state *x)
781 {
782 refcount_dec(&x->refcnt);
783 }
784
xfrm_state_put(struct xfrm_state * x)785 static inline void xfrm_state_put(struct xfrm_state *x)
786 {
787 if (refcount_dec_and_test(&x->refcnt))
788 __xfrm_state_destroy(x, false);
789 }
790
xfrm_state_put_sync(struct xfrm_state * x)791 static inline void xfrm_state_put_sync(struct xfrm_state *x)
792 {
793 if (refcount_dec_and_test(&x->refcnt))
794 __xfrm_state_destroy(x, true);
795 }
796
xfrm_state_hold(struct xfrm_state * x)797 static inline void xfrm_state_hold(struct xfrm_state *x)
798 {
799 refcount_inc(&x->refcnt);
800 }
801
addr_match(const void * token1,const void * token2,unsigned int prefixlen)802 static inline bool addr_match(const void *token1, const void *token2,
803 unsigned int prefixlen)
804 {
805 const __be32 *a1 = token1;
806 const __be32 *a2 = token2;
807 unsigned int pdw;
808 unsigned int pbi;
809
810 pdw = prefixlen >> 5; /* num of whole u32 in prefix */
811 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
812
813 if (pdw)
814 if (memcmp(a1, a2, pdw << 2))
815 return false;
816
817 if (pbi) {
818 __be32 mask;
819
820 mask = htonl((0xffffffff) << (32 - pbi));
821
822 if ((a1[pdw] ^ a2[pdw]) & mask)
823 return false;
824 }
825
826 return true;
827 }
828
addr4_match(__be32 a1,__be32 a2,u8 prefixlen)829 static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen)
830 {
831 /* C99 6.5.7 (3): u32 << 32 is undefined behaviour */
832 if (sizeof(long) == 4 && prefixlen == 0)
833 return true;
834 return !((a1 ^ a2) & htonl(~0UL << (32 - prefixlen)));
835 }
836
837 static __inline__
xfrm_flowi_sport(const struct flowi * fl,const union flowi_uli * uli)838 __be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli)
839 {
840 __be16 port;
841 switch(fl->flowi_proto) {
842 case IPPROTO_TCP:
843 case IPPROTO_UDP:
844 case IPPROTO_UDPLITE:
845 case IPPROTO_SCTP:
846 port = uli->ports.sport;
847 break;
848 case IPPROTO_ICMP:
849 case IPPROTO_ICMPV6:
850 port = htons(uli->icmpt.type);
851 break;
852 case IPPROTO_MH:
853 port = htons(uli->mht.type);
854 break;
855 case IPPROTO_GRE:
856 port = htons(ntohl(uli->gre_key) >> 16);
857 break;
858 default:
859 port = 0; /*XXX*/
860 }
861 return port;
862 }
863
864 static __inline__
xfrm_flowi_dport(const struct flowi * fl,const union flowi_uli * uli)865 __be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli)
866 {
867 __be16 port;
868 switch(fl->flowi_proto) {
869 case IPPROTO_TCP:
870 case IPPROTO_UDP:
871 case IPPROTO_UDPLITE:
872 case IPPROTO_SCTP:
873 port = uli->ports.dport;
874 break;
875 case IPPROTO_ICMP:
876 case IPPROTO_ICMPV6:
877 port = htons(uli->icmpt.code);
878 break;
879 case IPPROTO_GRE:
880 port = htons(ntohl(uli->gre_key) & 0xffff);
881 break;
882 default:
883 port = 0; /*XXX*/
884 }
885 return port;
886 }
887
888 bool xfrm_selector_match(const struct xfrm_selector *sel,
889 const struct flowi *fl, unsigned short family);
890
891 #ifdef CONFIG_SECURITY_NETWORK_XFRM
892 /* If neither has a context --> match
893 * Otherwise, both must have a context and the sids, doi, alg must match
894 */
xfrm_sec_ctx_match(struct xfrm_sec_ctx * s1,struct xfrm_sec_ctx * s2)895 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
896 {
897 return ((!s1 && !s2) ||
898 (s1 && s2 &&
899 (s1->ctx_sid == s2->ctx_sid) &&
900 (s1->ctx_doi == s2->ctx_doi) &&
901 (s1->ctx_alg == s2->ctx_alg)));
902 }
903 #else
xfrm_sec_ctx_match(struct xfrm_sec_ctx * s1,struct xfrm_sec_ctx * s2)904 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
905 {
906 return true;
907 }
908 #endif
909
910 /* A struct encoding bundle of transformations to apply to some set of flow.
911 *
912 * xdst->child points to the next element of bundle.
913 * dst->xfrm points to an instanse of transformer.
914 *
915 * Due to unfortunate limitations of current routing cache, which we
916 * have no time to fix, it mirrors struct rtable and bound to the same
917 * routing key, including saddr,daddr. However, we can have many of
918 * bundles differing by session id. All the bundles grow from a parent
919 * policy rule.
920 */
921 struct xfrm_dst {
922 union {
923 struct dst_entry dst;
924 struct rtable rt;
925 struct rt6_info rt6;
926 } u;
927 struct dst_entry *route;
928 struct dst_entry *child;
929 struct dst_entry *path;
930 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
931 int num_pols, num_xfrms;
932 u32 xfrm_genid;
933 u32 policy_genid;
934 u32 route_mtu_cached;
935 u32 child_mtu_cached;
936 u32 route_cookie;
937 u32 path_cookie;
938 };
939
xfrm_dst_path(const struct dst_entry * dst)940 static inline struct dst_entry *xfrm_dst_path(const struct dst_entry *dst)
941 {
942 #ifdef CONFIG_XFRM
943 if (dst->xfrm || (dst->flags & DST_XFRM_QUEUE)) {
944 const struct xfrm_dst *xdst = (const struct xfrm_dst *) dst;
945
946 return xdst->path;
947 }
948 #endif
949 return (struct dst_entry *) dst;
950 }
951
xfrm_dst_child(const struct dst_entry * dst)952 static inline struct dst_entry *xfrm_dst_child(const struct dst_entry *dst)
953 {
954 #ifdef CONFIG_XFRM
955 if (dst->xfrm || (dst->flags & DST_XFRM_QUEUE)) {
956 struct xfrm_dst *xdst = (struct xfrm_dst *) dst;
957 return xdst->child;
958 }
959 #endif
960 return NULL;
961 }
962
963 #ifdef CONFIG_XFRM
xfrm_dst_set_child(struct xfrm_dst * xdst,struct dst_entry * child)964 static inline void xfrm_dst_set_child(struct xfrm_dst *xdst, struct dst_entry *child)
965 {
966 xdst->child = child;
967 }
968
xfrm_dst_destroy(struct xfrm_dst * xdst)969 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
970 {
971 xfrm_pols_put(xdst->pols, xdst->num_pols);
972 dst_release(xdst->route);
973 if (likely(xdst->u.dst.xfrm))
974 xfrm_state_put(xdst->u.dst.xfrm);
975 }
976 #endif
977
978 void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
979
980 struct xfrm_if_parms {
981 int link; /* ifindex of underlying L2 interface */
982 u32 if_id; /* interface identifyer */
983 };
984
985 struct xfrm_if {
986 struct xfrm_if __rcu *next; /* next interface in list */
987 struct net_device *dev; /* virtual device associated with interface */
988 struct net *net; /* netns for packet i/o */
989 struct xfrm_if_parms p; /* interface parms */
990
991 struct gro_cells gro_cells;
992 };
993
994 struct xfrm_offload {
995 /* Output sequence number for replay protection on offloading. */
996 struct {
997 __u32 low;
998 __u32 hi;
999 } seq;
1000
1001 __u32 flags;
1002 #define SA_DELETE_REQ 1
1003 #define CRYPTO_DONE 2
1004 #define CRYPTO_NEXT_DONE 4
1005 #define CRYPTO_FALLBACK 8
1006 #define XFRM_GSO_SEGMENT 16
1007 #define XFRM_GRO 32
1008 #define XFRM_ESP_NO_TRAILER 64
1009 #define XFRM_DEV_RESUME 128
1010 #define XFRM_XMIT 256
1011
1012 __u32 status;
1013 #define CRYPTO_SUCCESS 1
1014 #define CRYPTO_GENERIC_ERROR 2
1015 #define CRYPTO_TRANSPORT_AH_AUTH_FAILED 4
1016 #define CRYPTO_TRANSPORT_ESP_AUTH_FAILED 8
1017 #define CRYPTO_TUNNEL_AH_AUTH_FAILED 16
1018 #define CRYPTO_TUNNEL_ESP_AUTH_FAILED 32
1019 #define CRYPTO_INVALID_PACKET_SYNTAX 64
1020 #define CRYPTO_INVALID_PROTOCOL 128
1021
1022 __u8 proto;
1023 __u8 inner_ipproto;
1024 };
1025
1026 struct sec_path {
1027 int len;
1028 int olen;
1029 int verified_cnt;
1030
1031 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
1032 struct xfrm_offload ovec[XFRM_MAX_OFFLOAD_DEPTH];
1033 };
1034
1035 struct sec_path *secpath_set(struct sk_buff *skb);
1036
1037 static inline void
secpath_reset(struct sk_buff * skb)1038 secpath_reset(struct sk_buff *skb)
1039 {
1040 #ifdef CONFIG_XFRM
1041 skb_ext_del(skb, SKB_EXT_SEC_PATH);
1042 #endif
1043 }
1044
1045 static inline int
xfrm_addr_any(const xfrm_address_t * addr,unsigned short family)1046 xfrm_addr_any(const xfrm_address_t *addr, unsigned short family)
1047 {
1048 switch (family) {
1049 case AF_INET:
1050 return addr->a4 == 0;
1051 case AF_INET6:
1052 return ipv6_addr_any(&addr->in6);
1053 }
1054 return 0;
1055 }
1056
1057 static inline int
__xfrm4_state_addr_cmp(const struct xfrm_tmpl * tmpl,const struct xfrm_state * x)1058 __xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1059 {
1060 return (tmpl->saddr.a4 &&
1061 tmpl->saddr.a4 != x->props.saddr.a4);
1062 }
1063
1064 static inline int
__xfrm6_state_addr_cmp(const struct xfrm_tmpl * tmpl,const struct xfrm_state * x)1065 __xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1066 {
1067 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
1068 !ipv6_addr_equal((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
1069 }
1070
1071 static inline int
xfrm_state_addr_cmp(const struct xfrm_tmpl * tmpl,const struct xfrm_state * x,unsigned short family)1072 xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family)
1073 {
1074 switch (family) {
1075 case AF_INET:
1076 return __xfrm4_state_addr_cmp(tmpl, x);
1077 case AF_INET6:
1078 return __xfrm6_state_addr_cmp(tmpl, x);
1079 }
1080 return !0;
1081 }
1082
1083 #ifdef CONFIG_XFRM
1084 int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb,
1085 unsigned short family);
1086
__xfrm_check_nopolicy(struct net * net,struct sk_buff * skb,int dir)1087 static inline bool __xfrm_check_nopolicy(struct net *net, struct sk_buff *skb,
1088 int dir)
1089 {
1090 if (!net->xfrm.policy_count[dir] && !secpath_exists(skb))
1091 return net->xfrm.policy_default[dir] == XFRM_USERPOLICY_ACCEPT;
1092
1093 return false;
1094 }
1095
__xfrm_check_dev_nopolicy(struct sk_buff * skb,int dir,unsigned short family)1096 static inline bool __xfrm_check_dev_nopolicy(struct sk_buff *skb,
1097 int dir, unsigned short family)
1098 {
1099 if (dir != XFRM_POLICY_OUT && family == AF_INET) {
1100 /* same dst may be used for traffic originating from
1101 * devices with different policy settings.
1102 */
1103 return IPCB(skb)->flags & IPSKB_NOPOLICY;
1104 }
1105 return skb_dst(skb) && (skb_dst(skb)->flags & DST_NOPOLICY);
1106 }
1107
__xfrm_policy_check2(struct sock * sk,int dir,struct sk_buff * skb,unsigned int family,int reverse)1108 static inline int __xfrm_policy_check2(struct sock *sk, int dir,
1109 struct sk_buff *skb,
1110 unsigned int family, int reverse)
1111 {
1112 struct net *net = dev_net(skb->dev);
1113 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
1114
1115 if (sk && sk->sk_policy[XFRM_POLICY_IN])
1116 return __xfrm_policy_check(sk, ndir, skb, family);
1117
1118 return __xfrm_check_nopolicy(net, skb, dir) ||
1119 __xfrm_check_dev_nopolicy(skb, dir, family) ||
1120 __xfrm_policy_check(sk, ndir, skb, family);
1121 }
1122
xfrm_policy_check(struct sock * sk,int dir,struct sk_buff * skb,unsigned short family)1123 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1124 {
1125 return __xfrm_policy_check2(sk, dir, skb, family, 0);
1126 }
1127
xfrm4_policy_check(struct sock * sk,int dir,struct sk_buff * skb)1128 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1129 {
1130 return xfrm_policy_check(sk, dir, skb, AF_INET);
1131 }
1132
xfrm6_policy_check(struct sock * sk,int dir,struct sk_buff * skb)1133 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1134 {
1135 return xfrm_policy_check(sk, dir, skb, AF_INET6);
1136 }
1137
xfrm4_policy_check_reverse(struct sock * sk,int dir,struct sk_buff * skb)1138 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1139 struct sk_buff *skb)
1140 {
1141 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1142 }
1143
xfrm6_policy_check_reverse(struct sock * sk,int dir,struct sk_buff * skb)1144 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1145 struct sk_buff *skb)
1146 {
1147 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1148 }
1149
1150 int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1151 unsigned int family, int reverse);
1152
xfrm_decode_session(struct sk_buff * skb,struct flowi * fl,unsigned int family)1153 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1154 unsigned int family)
1155 {
1156 return __xfrm_decode_session(skb, fl, family, 0);
1157 }
1158
xfrm_decode_session_reverse(struct sk_buff * skb,struct flowi * fl,unsigned int family)1159 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1160 struct flowi *fl,
1161 unsigned int family)
1162 {
1163 return __xfrm_decode_session(skb, fl, family, 1);
1164 }
1165
1166 int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1167
xfrm_route_forward(struct sk_buff * skb,unsigned short family)1168 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1169 {
1170 struct net *net = dev_net(skb->dev);
1171
1172 if (!net->xfrm.policy_count[XFRM_POLICY_OUT] &&
1173 net->xfrm.policy_default[XFRM_POLICY_OUT] == XFRM_USERPOLICY_ACCEPT)
1174 return true;
1175
1176 return (skb_dst(skb)->flags & DST_NOXFRM) ||
1177 __xfrm_route_forward(skb, family);
1178 }
1179
xfrm4_route_forward(struct sk_buff * skb)1180 static inline int xfrm4_route_forward(struct sk_buff *skb)
1181 {
1182 return xfrm_route_forward(skb, AF_INET);
1183 }
1184
xfrm6_route_forward(struct sk_buff * skb)1185 static inline int xfrm6_route_forward(struct sk_buff *skb)
1186 {
1187 return xfrm_route_forward(skb, AF_INET6);
1188 }
1189
1190 int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk);
1191
xfrm_sk_clone_policy(struct sock * sk,const struct sock * osk)1192 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk)
1193 {
1194 if (!sk_fullsock(osk))
1195 return 0;
1196 sk->sk_policy[0] = NULL;
1197 sk->sk_policy[1] = NULL;
1198 if (unlikely(osk->sk_policy[0] || osk->sk_policy[1]))
1199 return __xfrm_sk_clone_policy(sk, osk);
1200 return 0;
1201 }
1202
1203 int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1204
xfrm_sk_free_policy(struct sock * sk)1205 static inline void xfrm_sk_free_policy(struct sock *sk)
1206 {
1207 struct xfrm_policy *pol;
1208
1209 pol = rcu_dereference_protected(sk->sk_policy[0], 1);
1210 if (unlikely(pol != NULL)) {
1211 xfrm_policy_delete(pol, XFRM_POLICY_MAX);
1212 sk->sk_policy[0] = NULL;
1213 }
1214 pol = rcu_dereference_protected(sk->sk_policy[1], 1);
1215 if (unlikely(pol != NULL)) {
1216 xfrm_policy_delete(pol, XFRM_POLICY_MAX+1);
1217 sk->sk_policy[1] = NULL;
1218 }
1219 }
1220
1221 #else
1222
xfrm_sk_free_policy(struct sock * sk)1223 static inline void xfrm_sk_free_policy(struct sock *sk) {}
xfrm_sk_clone_policy(struct sock * sk,const struct sock * osk)1224 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) { return 0; }
xfrm6_route_forward(struct sk_buff * skb)1225 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
xfrm4_route_forward(struct sk_buff * skb)1226 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
xfrm6_policy_check(struct sock * sk,int dir,struct sk_buff * skb)1227 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1228 {
1229 return 1;
1230 }
xfrm4_policy_check(struct sock * sk,int dir,struct sk_buff * skb)1231 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1232 {
1233 return 1;
1234 }
xfrm_policy_check(struct sock * sk,int dir,struct sk_buff * skb,unsigned short family)1235 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1236 {
1237 return 1;
1238 }
xfrm_decode_session_reverse(struct sk_buff * skb,struct flowi * fl,unsigned int family)1239 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1240 struct flowi *fl,
1241 unsigned int family)
1242 {
1243 return -ENOSYS;
1244 }
xfrm4_policy_check_reverse(struct sock * sk,int dir,struct sk_buff * skb)1245 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1246 struct sk_buff *skb)
1247 {
1248 return 1;
1249 }
xfrm6_policy_check_reverse(struct sock * sk,int dir,struct sk_buff * skb)1250 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1251 struct sk_buff *skb)
1252 {
1253 return 1;
1254 }
1255 #endif
1256
1257 static __inline__
xfrm_flowi_daddr(const struct flowi * fl,unsigned short family)1258 xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family)
1259 {
1260 switch (family){
1261 case AF_INET:
1262 return (xfrm_address_t *)&fl->u.ip4.daddr;
1263 case AF_INET6:
1264 return (xfrm_address_t *)&fl->u.ip6.daddr;
1265 }
1266 return NULL;
1267 }
1268
1269 static __inline__
xfrm_flowi_saddr(const struct flowi * fl,unsigned short family)1270 xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family)
1271 {
1272 switch (family){
1273 case AF_INET:
1274 return (xfrm_address_t *)&fl->u.ip4.saddr;
1275 case AF_INET6:
1276 return (xfrm_address_t *)&fl->u.ip6.saddr;
1277 }
1278 return NULL;
1279 }
1280
1281 static __inline__
xfrm_flowi_addr_get(const struct flowi * fl,xfrm_address_t * saddr,xfrm_address_t * daddr,unsigned short family)1282 void xfrm_flowi_addr_get(const struct flowi *fl,
1283 xfrm_address_t *saddr, xfrm_address_t *daddr,
1284 unsigned short family)
1285 {
1286 switch(family) {
1287 case AF_INET:
1288 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4));
1289 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4));
1290 break;
1291 case AF_INET6:
1292 saddr->in6 = fl->u.ip6.saddr;
1293 daddr->in6 = fl->u.ip6.daddr;
1294 break;
1295 }
1296 }
1297
1298 static __inline__ int
__xfrm4_state_addr_check(const struct xfrm_state * x,const xfrm_address_t * daddr,const xfrm_address_t * saddr)1299 __xfrm4_state_addr_check(const struct xfrm_state *x,
1300 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1301 {
1302 if (daddr->a4 == x->id.daddr.a4 &&
1303 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1304 return 1;
1305 return 0;
1306 }
1307
1308 static __inline__ int
__xfrm6_state_addr_check(const struct xfrm_state * x,const xfrm_address_t * daddr,const xfrm_address_t * saddr)1309 __xfrm6_state_addr_check(const struct xfrm_state *x,
1310 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1311 {
1312 if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1313 (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) ||
1314 ipv6_addr_any((struct in6_addr *)saddr) ||
1315 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1316 return 1;
1317 return 0;
1318 }
1319
1320 static __inline__ int
xfrm_state_addr_check(const struct xfrm_state * x,const xfrm_address_t * daddr,const xfrm_address_t * saddr,unsigned short family)1321 xfrm_state_addr_check(const struct xfrm_state *x,
1322 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1323 unsigned short family)
1324 {
1325 switch (family) {
1326 case AF_INET:
1327 return __xfrm4_state_addr_check(x, daddr, saddr);
1328 case AF_INET6:
1329 return __xfrm6_state_addr_check(x, daddr, saddr);
1330 }
1331 return 0;
1332 }
1333
1334 static __inline__ int
xfrm_state_addr_flow_check(const struct xfrm_state * x,const struct flowi * fl,unsigned short family)1335 xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl,
1336 unsigned short family)
1337 {
1338 switch (family) {
1339 case AF_INET:
1340 return __xfrm4_state_addr_check(x,
1341 (const xfrm_address_t *)&fl->u.ip4.daddr,
1342 (const xfrm_address_t *)&fl->u.ip4.saddr);
1343 case AF_INET6:
1344 return __xfrm6_state_addr_check(x,
1345 (const xfrm_address_t *)&fl->u.ip6.daddr,
1346 (const xfrm_address_t *)&fl->u.ip6.saddr);
1347 }
1348 return 0;
1349 }
1350
xfrm_state_kern(const struct xfrm_state * x)1351 static inline int xfrm_state_kern(const struct xfrm_state *x)
1352 {
1353 return atomic_read(&x->tunnel_users);
1354 }
1355
xfrm_id_proto_valid(u8 proto)1356 static inline bool xfrm_id_proto_valid(u8 proto)
1357 {
1358 switch (proto) {
1359 case IPPROTO_AH:
1360 case IPPROTO_ESP:
1361 case IPPROTO_COMP:
1362 #if IS_ENABLED(CONFIG_IPV6)
1363 case IPPROTO_ROUTING:
1364 case IPPROTO_DSTOPTS:
1365 #endif
1366 return true;
1367 default:
1368 return false;
1369 }
1370 }
1371
1372 /* IPSEC_PROTO_ANY only matches 3 IPsec protocols, 0 could match all. */
xfrm_id_proto_match(u8 proto,u8 userproto)1373 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1374 {
1375 return (!userproto || proto == userproto ||
1376 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1377 proto == IPPROTO_ESP ||
1378 proto == IPPROTO_COMP)));
1379 }
1380
1381 /*
1382 * xfrm algorithm information
1383 */
1384 struct xfrm_algo_aead_info {
1385 char *geniv;
1386 u16 icv_truncbits;
1387 };
1388
1389 struct xfrm_algo_auth_info {
1390 u16 icv_truncbits;
1391 u16 icv_fullbits;
1392 };
1393
1394 struct xfrm_algo_encr_info {
1395 char *geniv;
1396 u16 blockbits;
1397 u16 defkeybits;
1398 };
1399
1400 struct xfrm_algo_comp_info {
1401 u16 threshold;
1402 };
1403
1404 struct xfrm_algo_desc {
1405 char *name;
1406 char *compat;
1407 u8 available:1;
1408 u8 pfkey_supported:1;
1409 union {
1410 struct xfrm_algo_aead_info aead;
1411 struct xfrm_algo_auth_info auth;
1412 struct xfrm_algo_encr_info encr;
1413 struct xfrm_algo_comp_info comp;
1414 } uinfo;
1415 struct sadb_alg desc;
1416 };
1417
1418 /* XFRM protocol handlers. */
1419 struct xfrm4_protocol {
1420 int (*handler)(struct sk_buff *skb);
1421 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1422 int encap_type);
1423 int (*cb_handler)(struct sk_buff *skb, int err);
1424 int (*err_handler)(struct sk_buff *skb, u32 info);
1425
1426 struct xfrm4_protocol __rcu *next;
1427 int priority;
1428 };
1429
1430 struct xfrm6_protocol {
1431 int (*handler)(struct sk_buff *skb);
1432 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1433 int encap_type);
1434 int (*cb_handler)(struct sk_buff *skb, int err);
1435 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1436 u8 type, u8 code, int offset, __be32 info);
1437
1438 struct xfrm6_protocol __rcu *next;
1439 int priority;
1440 };
1441
1442 /* XFRM tunnel handlers. */
1443 struct xfrm_tunnel {
1444 int (*handler)(struct sk_buff *skb);
1445 int (*cb_handler)(struct sk_buff *skb, int err);
1446 int (*err_handler)(struct sk_buff *skb, u32 info);
1447
1448 struct xfrm_tunnel __rcu *next;
1449 int priority;
1450 };
1451
1452 struct xfrm6_tunnel {
1453 int (*handler)(struct sk_buff *skb);
1454 int (*cb_handler)(struct sk_buff *skb, int err);
1455 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1456 u8 type, u8 code, int offset, __be32 info);
1457 struct xfrm6_tunnel __rcu *next;
1458 int priority;
1459 };
1460
1461 void xfrm_init(void);
1462 void xfrm4_init(void);
1463 int xfrm_state_init(struct net *net);
1464 void xfrm_state_fini(struct net *net);
1465 void xfrm4_state_init(void);
1466 void xfrm4_protocol_init(void);
1467 #ifdef CONFIG_XFRM
1468 int xfrm6_init(void);
1469 void xfrm6_fini(void);
1470 int xfrm6_state_init(void);
1471 void xfrm6_state_fini(void);
1472 int xfrm6_protocol_init(void);
1473 void xfrm6_protocol_fini(void);
1474 #else
xfrm6_init(void)1475 static inline int xfrm6_init(void)
1476 {
1477 return 0;
1478 }
xfrm6_fini(void)1479 static inline void xfrm6_fini(void)
1480 {
1481 ;
1482 }
1483 #endif
1484
1485 #ifdef CONFIG_XFRM_STATISTICS
1486 int xfrm_proc_init(struct net *net);
1487 void xfrm_proc_fini(struct net *net);
1488 #endif
1489
1490 int xfrm_sysctl_init(struct net *net);
1491 #ifdef CONFIG_SYSCTL
1492 void xfrm_sysctl_fini(struct net *net);
1493 #else
xfrm_sysctl_fini(struct net * net)1494 static inline void xfrm_sysctl_fini(struct net *net)
1495 {
1496 }
1497 #endif
1498
1499 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
1500 struct xfrm_address_filter *filter);
1501 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1502 int (*func)(struct xfrm_state *, int, void*), void *);
1503 void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net);
1504 struct xfrm_state *xfrm_state_alloc(struct net *net);
1505 void xfrm_state_free(struct xfrm_state *x);
1506 struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr,
1507 const xfrm_address_t *saddr,
1508 const struct flowi *fl,
1509 struct xfrm_tmpl *tmpl,
1510 struct xfrm_policy *pol, int *err,
1511 unsigned short family, u32 if_id);
1512 struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark, u32 if_id,
1513 xfrm_address_t *daddr,
1514 xfrm_address_t *saddr,
1515 unsigned short family,
1516 u8 mode, u8 proto, u32 reqid);
1517 struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
1518 unsigned short family);
1519 int xfrm_state_check_expire(struct xfrm_state *x);
1520 void xfrm_state_insert(struct xfrm_state *x);
1521 int xfrm_state_add(struct xfrm_state *x);
1522 int xfrm_state_update(struct xfrm_state *x);
1523 struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1524 const xfrm_address_t *daddr, __be32 spi,
1525 u8 proto, unsigned short family);
1526 struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1527 const xfrm_address_t *daddr,
1528 const xfrm_address_t *saddr,
1529 u8 proto,
1530 unsigned short family);
1531 #ifdef CONFIG_XFRM_SUB_POLICY
1532 void xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1533 unsigned short family);
1534 void xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1535 unsigned short family);
1536 #else
xfrm_tmpl_sort(struct xfrm_tmpl ** d,struct xfrm_tmpl ** s,int n,unsigned short family)1537 static inline void xfrm_tmpl_sort(struct xfrm_tmpl **d, struct xfrm_tmpl **s,
1538 int n, unsigned short family)
1539 {
1540 }
1541
xfrm_state_sort(struct xfrm_state ** d,struct xfrm_state ** s,int n,unsigned short family)1542 static inline void xfrm_state_sort(struct xfrm_state **d, struct xfrm_state **s,
1543 int n, unsigned short family)
1544 {
1545 }
1546 #endif
1547
1548 struct xfrmk_sadinfo {
1549 u32 sadhcnt; /* current hash bkts */
1550 u32 sadhmcnt; /* max allowed hash bkts */
1551 u32 sadcnt; /* current running count */
1552 };
1553
1554 struct xfrmk_spdinfo {
1555 u32 incnt;
1556 u32 outcnt;
1557 u32 fwdcnt;
1558 u32 inscnt;
1559 u32 outscnt;
1560 u32 fwdscnt;
1561 u32 spdhcnt;
1562 u32 spdhmcnt;
1563 };
1564
1565 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1566 int xfrm_state_delete(struct xfrm_state *x);
1567 int xfrm_state_flush(struct net *net, u8 proto, bool task_valid, bool sync);
1568 int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid);
1569 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1570 void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1571 u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq);
1572 int xfrm_init_replay(struct xfrm_state *x);
1573 u32 xfrm_state_mtu(struct xfrm_state *x, int mtu);
1574 int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload);
1575 int xfrm_init_state(struct xfrm_state *x);
1576 int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type);
1577 int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1578 int xfrm_trans_queue_net(struct net *net, struct sk_buff *skb,
1579 int (*finish)(struct net *, struct sock *,
1580 struct sk_buff *));
1581 int xfrm_trans_queue(struct sk_buff *skb,
1582 int (*finish)(struct net *, struct sock *,
1583 struct sk_buff *));
1584 int xfrm_output_resume(struct sk_buff *skb, int err);
1585 int xfrm_output(struct sock *sk, struct sk_buff *skb);
1586
1587 int pktgen_xfrm_outer_mode_output(struct xfrm_state *x, struct sk_buff *skb);
1588
1589 void xfrm_local_error(struct sk_buff *skb, int mtu);
1590 int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1591 int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1592 int encap_type);
1593 int xfrm4_transport_finish(struct sk_buff *skb, int async);
1594 int xfrm4_rcv(struct sk_buff *skb);
1595
xfrm4_rcv_spi(struct sk_buff * skb,int nexthdr,__be32 spi)1596 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1597 {
1598 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
1599 XFRM_SPI_SKB_CB(skb)->family = AF_INET;
1600 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
1601 return xfrm_input(skb, nexthdr, spi, 0);
1602 }
1603
1604 int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1605 int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol);
1606 int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol);
1607 int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1608 int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1609 void xfrm4_local_error(struct sk_buff *skb, u32 mtu);
1610 int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1611 int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi,
1612 struct ip6_tnl *t);
1613 int xfrm6_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1614 int encap_type);
1615 int xfrm6_transport_finish(struct sk_buff *skb, int async);
1616 int xfrm6_rcv_tnl(struct sk_buff *skb, struct ip6_tnl *t);
1617 int xfrm6_rcv(struct sk_buff *skb);
1618 int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1619 xfrm_address_t *saddr, u8 proto);
1620 void xfrm6_local_error(struct sk_buff *skb, u32 mtu);
1621 int xfrm6_protocol_register(struct xfrm6_protocol *handler, unsigned char protocol);
1622 int xfrm6_protocol_deregister(struct xfrm6_protocol *handler, unsigned char protocol);
1623 int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1624 int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1625 __be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1626 __be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr);
1627 int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1628
1629 #ifdef CONFIG_XFRM
1630 void xfrm6_local_rxpmtu(struct sk_buff *skb, u32 mtu);
1631 int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1632 int xfrm6_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1633 int xfrm_user_policy(struct sock *sk, int optname, sockptr_t optval,
1634 int optlen);
1635 #else
xfrm_user_policy(struct sock * sk,int optname,sockptr_t optval,int optlen)1636 static inline int xfrm_user_policy(struct sock *sk, int optname,
1637 sockptr_t optval, int optlen)
1638 {
1639 return -ENOPROTOOPT;
1640 }
1641 #endif
1642
1643 struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, int oif,
1644 const xfrm_address_t *saddr,
1645 const xfrm_address_t *daddr,
1646 int family, u32 mark);
1647
1648 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1649
1650 void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1651 int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1652 int (*func)(struct xfrm_policy *, int, int, void*),
1653 void *);
1654 void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net);
1655 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1656 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net,
1657 const struct xfrm_mark *mark,
1658 u32 if_id, u8 type, int dir,
1659 struct xfrm_selector *sel,
1660 struct xfrm_sec_ctx *ctx, int delete,
1661 int *err);
1662 struct xfrm_policy *xfrm_policy_byid(struct net *net,
1663 const struct xfrm_mark *mark, u32 if_id,
1664 u8 type, int dir, u32 id, int delete,
1665 int *err);
1666 int xfrm_policy_flush(struct net *net, u8 type, bool task_valid);
1667 void xfrm_policy_hash_rebuild(struct net *net);
1668 u32 xfrm_get_acqseq(void);
1669 int verify_spi_info(u8 proto, u32 min, u32 max);
1670 int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1671 struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark,
1672 u8 mode, u32 reqid, u32 if_id, u8 proto,
1673 const xfrm_address_t *daddr,
1674 const xfrm_address_t *saddr, int create,
1675 unsigned short family);
1676 int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1677
1678 #ifdef CONFIG_XFRM_MIGRATE
1679 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1680 const struct xfrm_migrate *m, int num_bundles,
1681 const struct xfrm_kmaddress *k,
1682 const struct xfrm_encap_tmpl *encap);
1683 struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net,
1684 u32 if_id);
1685 struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1686 struct xfrm_migrate *m,
1687 struct xfrm_encap_tmpl *encap);
1688 int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1689 struct xfrm_migrate *m, int num_bundles,
1690 struct xfrm_kmaddress *k, struct net *net,
1691 struct xfrm_encap_tmpl *encap, u32 if_id);
1692 #endif
1693
1694 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1695 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid);
1696 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel,
1697 xfrm_address_t *addr);
1698
1699 void xfrm_input_init(void);
1700 int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1701
1702 void xfrm_probe_algs(void);
1703 int xfrm_count_pfkey_auth_supported(void);
1704 int xfrm_count_pfkey_enc_supported(void);
1705 struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1706 struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1707 struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1708 struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1709 struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1710 struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe);
1711 struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe);
1712 struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe);
1713 struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len,
1714 int probe);
1715
xfrm6_addr_equal(const xfrm_address_t * a,const xfrm_address_t * b)1716 static inline bool xfrm6_addr_equal(const xfrm_address_t *a,
1717 const xfrm_address_t *b)
1718 {
1719 return ipv6_addr_equal((const struct in6_addr *)a,
1720 (const struct in6_addr *)b);
1721 }
1722
xfrm_addr_equal(const xfrm_address_t * a,const xfrm_address_t * b,sa_family_t family)1723 static inline bool xfrm_addr_equal(const xfrm_address_t *a,
1724 const xfrm_address_t *b,
1725 sa_family_t family)
1726 {
1727 switch (family) {
1728 default:
1729 case AF_INET:
1730 return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0;
1731 case AF_INET6:
1732 return xfrm6_addr_equal(a, b);
1733 }
1734 }
1735
xfrm_policy_id2dir(u32 index)1736 static inline int xfrm_policy_id2dir(u32 index)
1737 {
1738 return index & 7;
1739 }
1740
1741 #ifdef CONFIG_XFRM
1742 void xfrm_replay_advance(struct xfrm_state *x, __be32 net_seq);
1743 int xfrm_replay_check(struct xfrm_state *x, struct sk_buff *skb, __be32 net_seq);
1744 void xfrm_replay_notify(struct xfrm_state *x, int event);
1745 int xfrm_replay_overflow(struct xfrm_state *x, struct sk_buff *skb);
1746 int xfrm_replay_recheck(struct xfrm_state *x, struct sk_buff *skb, __be32 net_seq);
1747
xfrm_aevent_is_on(struct net * net)1748 static inline int xfrm_aevent_is_on(struct net *net)
1749 {
1750 struct sock *nlsk;
1751 int ret = 0;
1752
1753 rcu_read_lock();
1754 nlsk = rcu_dereference(net->xfrm.nlsk);
1755 if (nlsk)
1756 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1757 rcu_read_unlock();
1758 return ret;
1759 }
1760
xfrm_acquire_is_on(struct net * net)1761 static inline int xfrm_acquire_is_on(struct net *net)
1762 {
1763 struct sock *nlsk;
1764 int ret = 0;
1765
1766 rcu_read_lock();
1767 nlsk = rcu_dereference(net->xfrm.nlsk);
1768 if (nlsk)
1769 ret = netlink_has_listeners(nlsk, XFRMNLGRP_ACQUIRE);
1770 rcu_read_unlock();
1771
1772 return ret;
1773 }
1774 #endif
1775
aead_len(struct xfrm_algo_aead * alg)1776 static inline unsigned int aead_len(struct xfrm_algo_aead *alg)
1777 {
1778 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1779 }
1780
xfrm_alg_len(const struct xfrm_algo * alg)1781 static inline unsigned int xfrm_alg_len(const struct xfrm_algo *alg)
1782 {
1783 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1784 }
1785
xfrm_alg_auth_len(const struct xfrm_algo_auth * alg)1786 static inline unsigned int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg)
1787 {
1788 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1789 }
1790
xfrm_replay_state_esn_len(struct xfrm_replay_state_esn * replay_esn)1791 static inline unsigned int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn)
1792 {
1793 return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32);
1794 }
1795
1796 #ifdef CONFIG_XFRM_MIGRATE
xfrm_replay_clone(struct xfrm_state * x,struct xfrm_state * orig)1797 static inline int xfrm_replay_clone(struct xfrm_state *x,
1798 struct xfrm_state *orig)
1799 {
1800
1801 x->replay_esn = kmemdup(orig->replay_esn,
1802 xfrm_replay_state_esn_len(orig->replay_esn),
1803 GFP_KERNEL);
1804 if (!x->replay_esn)
1805 return -ENOMEM;
1806 x->preplay_esn = kmemdup(orig->preplay_esn,
1807 xfrm_replay_state_esn_len(orig->preplay_esn),
1808 GFP_KERNEL);
1809 if (!x->preplay_esn)
1810 return -ENOMEM;
1811
1812 return 0;
1813 }
1814
xfrm_algo_aead_clone(struct xfrm_algo_aead * orig)1815 static inline struct xfrm_algo_aead *xfrm_algo_aead_clone(struct xfrm_algo_aead *orig)
1816 {
1817 return kmemdup(orig, aead_len(orig), GFP_KERNEL);
1818 }
1819
1820
xfrm_algo_clone(struct xfrm_algo * orig)1821 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1822 {
1823 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1824 }
1825
xfrm_algo_auth_clone(struct xfrm_algo_auth * orig)1826 static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1827 {
1828 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1829 }
1830
xfrm_states_put(struct xfrm_state ** states,int n)1831 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1832 {
1833 int i;
1834 for (i = 0; i < n; i++)
1835 xfrm_state_put(*(states + i));
1836 }
1837
xfrm_states_delete(struct xfrm_state ** states,int n)1838 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1839 {
1840 int i;
1841 for (i = 0; i < n; i++)
1842 xfrm_state_delete(*(states + i));
1843 }
1844 #endif
1845
1846 #ifdef CONFIG_XFRM
xfrm_input_state(struct sk_buff * skb)1847 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1848 {
1849 struct sec_path *sp = skb_sec_path(skb);
1850
1851 return sp->xvec[sp->len - 1];
1852 }
1853 #endif
1854
xfrm_offload(struct sk_buff * skb)1855 static inline struct xfrm_offload *xfrm_offload(struct sk_buff *skb)
1856 {
1857 #ifdef CONFIG_XFRM
1858 struct sec_path *sp = skb_sec_path(skb);
1859
1860 if (!sp || !sp->olen || sp->len != sp->olen)
1861 return NULL;
1862
1863 return &sp->ovec[sp->olen - 1];
1864 #else
1865 return NULL;
1866 #endif
1867 }
1868
1869 void __init xfrm_dev_init(void);
1870
1871 #ifdef CONFIG_XFRM_OFFLOAD
1872 void xfrm_dev_resume(struct sk_buff *skb);
1873 void xfrm_dev_backlog(struct softnet_data *sd);
1874 struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again);
1875 int xfrm_dev_state_add(struct net *net, struct xfrm_state *x,
1876 struct xfrm_user_offload *xuo);
1877 bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x);
1878
xfrm_dev_state_advance_esn(struct xfrm_state * x)1879 static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
1880 {
1881 struct xfrm_state_offload *xso = &x->xso;
1882
1883 if (xso->dev && xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn)
1884 xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn(x);
1885 }
1886
xfrm_dst_offload_ok(struct dst_entry * dst)1887 static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
1888 {
1889 struct xfrm_state *x = dst->xfrm;
1890 struct xfrm_dst *xdst;
1891
1892 if (!x || !x->type_offload)
1893 return false;
1894
1895 xdst = (struct xfrm_dst *) dst;
1896 if (!x->xso.offload_handle && !xdst->child->xfrm)
1897 return true;
1898 if (x->xso.offload_handle && (x->xso.dev == xfrm_dst_path(dst)->dev) &&
1899 !xdst->child->xfrm)
1900 return true;
1901
1902 return false;
1903 }
1904
xfrm_dev_state_delete(struct xfrm_state * x)1905 static inline void xfrm_dev_state_delete(struct xfrm_state *x)
1906 {
1907 struct xfrm_state_offload *xso = &x->xso;
1908
1909 if (xso->dev)
1910 xso->dev->xfrmdev_ops->xdo_dev_state_delete(x);
1911 }
1912
xfrm_dev_state_free(struct xfrm_state * x)1913 static inline void xfrm_dev_state_free(struct xfrm_state *x)
1914 {
1915 struct xfrm_state_offload *xso = &x->xso;
1916 struct net_device *dev = xso->dev;
1917
1918 if (dev && dev->xfrmdev_ops) {
1919 if (dev->xfrmdev_ops->xdo_dev_state_free)
1920 dev->xfrmdev_ops->xdo_dev_state_free(x);
1921 xso->dev = NULL;
1922 dev_put(dev);
1923 }
1924 }
1925 #else
xfrm_dev_resume(struct sk_buff * skb)1926 static inline void xfrm_dev_resume(struct sk_buff *skb)
1927 {
1928 }
1929
xfrm_dev_backlog(struct softnet_data * sd)1930 static inline void xfrm_dev_backlog(struct softnet_data *sd)
1931 {
1932 }
1933
validate_xmit_xfrm(struct sk_buff * skb,netdev_features_t features,bool * again)1934 static inline struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again)
1935 {
1936 return skb;
1937 }
1938
xfrm_dev_state_add(struct net * net,struct xfrm_state * x,struct xfrm_user_offload * xuo)1939 static inline int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, struct xfrm_user_offload *xuo)
1940 {
1941 return 0;
1942 }
1943
xfrm_dev_state_delete(struct xfrm_state * x)1944 static inline void xfrm_dev_state_delete(struct xfrm_state *x)
1945 {
1946 }
1947
xfrm_dev_state_free(struct xfrm_state * x)1948 static inline void xfrm_dev_state_free(struct xfrm_state *x)
1949 {
1950 }
1951
xfrm_dev_offload_ok(struct sk_buff * skb,struct xfrm_state * x)1952 static inline bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x)
1953 {
1954 return false;
1955 }
1956
xfrm_dev_state_advance_esn(struct xfrm_state * x)1957 static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
1958 {
1959 }
1960
xfrm_dst_offload_ok(struct dst_entry * dst)1961 static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
1962 {
1963 return false;
1964 }
1965 #endif
1966
xfrm_mark_get(struct nlattr ** attrs,struct xfrm_mark * m)1967 static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
1968 {
1969 if (attrs[XFRMA_MARK])
1970 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark));
1971 else
1972 m->v = m->m = 0;
1973
1974 return m->v & m->m;
1975 }
1976
xfrm_mark_put(struct sk_buff * skb,const struct xfrm_mark * m)1977 static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m)
1978 {
1979 int ret = 0;
1980
1981 if (m->m | m->v)
1982 ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
1983 return ret;
1984 }
1985
xfrm_smark_get(__u32 mark,struct xfrm_state * x)1986 static inline __u32 xfrm_smark_get(__u32 mark, struct xfrm_state *x)
1987 {
1988 struct xfrm_mark *m = &x->props.smark;
1989
1990 return (m->v & m->m) | (mark & ~m->m);
1991 }
1992
xfrm_if_id_put(struct sk_buff * skb,__u32 if_id)1993 static inline int xfrm_if_id_put(struct sk_buff *skb, __u32 if_id)
1994 {
1995 int ret = 0;
1996
1997 if (if_id)
1998 ret = nla_put_u32(skb, XFRMA_IF_ID, if_id);
1999 return ret;
2000 }
2001
xfrm_tunnel_check(struct sk_buff * skb,struct xfrm_state * x,unsigned int family)2002 static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x,
2003 unsigned int family)
2004 {
2005 bool tunnel = false;
2006
2007 switch(family) {
2008 case AF_INET:
2009 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4)
2010 tunnel = true;
2011 break;
2012 case AF_INET6:
2013 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6)
2014 tunnel = true;
2015 break;
2016 }
2017 if (tunnel && !(x->outer_mode.flags & XFRM_MODE_FLAG_TUNNEL))
2018 return -EINVAL;
2019
2020 return 0;
2021 }
2022
2023 extern const int xfrm_msg_min[XFRM_NR_MSGTYPES];
2024 extern const struct nla_policy xfrma_policy[XFRMA_MAX+1];
2025
2026 struct xfrm_translator {
2027 /* Allocate frag_list and put compat translation there */
2028 int (*alloc_compat)(struct sk_buff *skb, const struct nlmsghdr *src);
2029
2030 /* Allocate nlmsg with 64-bit translaton of received 32-bit message */
2031 struct nlmsghdr *(*rcv_msg_compat)(const struct nlmsghdr *nlh,
2032 int maxtype, const struct nla_policy *policy,
2033 struct netlink_ext_ack *extack);
2034
2035 /* Translate 32-bit user_policy from sockptr */
2036 int (*xlate_user_policy_sockptr)(u8 **pdata32, int optlen);
2037
2038 struct module *owner;
2039 };
2040
2041 #if IS_ENABLED(CONFIG_XFRM_USER_COMPAT)
2042 extern int xfrm_register_translator(struct xfrm_translator *xtr);
2043 extern int xfrm_unregister_translator(struct xfrm_translator *xtr);
2044 extern struct xfrm_translator *xfrm_get_translator(void);
2045 extern void xfrm_put_translator(struct xfrm_translator *xtr);
2046 #else
xfrm_get_translator(void)2047 static inline struct xfrm_translator *xfrm_get_translator(void)
2048 {
2049 return NULL;
2050 }
xfrm_put_translator(struct xfrm_translator * xtr)2051 static inline void xfrm_put_translator(struct xfrm_translator *xtr)
2052 {
2053 }
2054 #endif
2055
2056 #if IS_ENABLED(CONFIG_IPV6)
xfrm6_local_dontfrag(const struct sock * sk)2057 static inline bool xfrm6_local_dontfrag(const struct sock *sk)
2058 {
2059 int proto;
2060
2061 if (!sk || sk->sk_family != AF_INET6)
2062 return false;
2063
2064 proto = sk->sk_protocol;
2065 if (proto == IPPROTO_UDP || proto == IPPROTO_RAW)
2066 return inet6_sk(sk)->dontfrag;
2067
2068 return false;
2069 }
2070 #endif
2071 #endif /* _NET_XFRM_H */
2072