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 /* Full description of state of transformer. */
149 struct xfrm_state {
150 possible_net_t xs_net;
151 union {
152 struct hlist_node gclist;
153 struct hlist_node bydst;
154 };
155 struct hlist_node bysrc;
156 struct hlist_node byspi;
157
158 refcount_t refcnt;
159 spinlock_t lock;
160
161 struct xfrm_id id;
162 struct xfrm_selector sel;
163 struct xfrm_mark mark;
164 u32 if_id;
165 u32 tfcpad;
166
167 u32 genid;
168
169 /* Key manager bits */
170 struct xfrm_state_walk km;
171
172 /* Parameters of this state. */
173 struct {
174 u32 reqid;
175 u8 mode;
176 u8 replay_window;
177 u8 aalgo, ealgo, calgo;
178 u8 flags;
179 u16 family;
180 xfrm_address_t saddr;
181 int header_len;
182 int trailer_len;
183 u32 extra_flags;
184 struct xfrm_mark smark;
185 } props;
186
187 struct xfrm_lifetime_cfg lft;
188
189 /* Data for transformer */
190 struct xfrm_algo_auth *aalg;
191 struct xfrm_algo *ealg;
192 struct xfrm_algo *calg;
193 struct xfrm_algo_aead *aead;
194 const char *geniv;
195
196 /* mapping change rate limiting */
197 __be16 new_mapping_sport;
198 u32 new_mapping; /* seconds */
199 u32 mapping_maxage; /* seconds for input SA */
200
201 /* Data for encapsulator */
202 struct xfrm_encap_tmpl *encap;
203
204 /* Data for care-of address */
205 xfrm_address_t *coaddr;
206
207 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
208 struct xfrm_state *tunnel;
209
210 /* If a tunnel, number of users + 1 */
211 atomic_t tunnel_users;
212
213 /* State for replay detection */
214 struct xfrm_replay_state replay;
215 struct xfrm_replay_state_esn *replay_esn;
216
217 /* Replay detection state at the time we sent the last notification */
218 struct xfrm_replay_state preplay;
219 struct xfrm_replay_state_esn *preplay_esn;
220
221 /* The functions for replay detection. */
222 const struct xfrm_replay *repl;
223
224 /* internal flag that only holds state for delayed aevent at the
225 * moment
226 */
227 u32 xflags;
228
229 /* Replay detection notification settings */
230 u32 replay_maxage;
231 u32 replay_maxdiff;
232
233 /* Replay detection notification timer */
234 struct timer_list rtimer;
235
236 /* Statistics */
237 struct xfrm_stats stats;
238
239 struct xfrm_lifetime_cur curlft;
240 struct hrtimer mtimer;
241
242 struct xfrm_state_offload xso;
243
244 /* used to fix curlft->add_time when changing date */
245 long saved_tmo;
246
247 /* Last used time */
248 time64_t lastused;
249
250 struct page_frag xfrag;
251
252 /* Reference to data common to all the instances of this
253 * transformer. */
254 const struct xfrm_type *type;
255 struct xfrm_mode inner_mode;
256 struct xfrm_mode inner_mode_iaf;
257 struct xfrm_mode outer_mode;
258
259 const struct xfrm_type_offload *type_offload;
260
261 /* Security context */
262 struct xfrm_sec_ctx *security;
263
264 /* Private data of this transformer, format is opaque,
265 * interpreted by xfrm_type methods. */
266 void *data;
267 };
268
xs_net(struct xfrm_state * x)269 static inline struct net *xs_net(struct xfrm_state *x)
270 {
271 return read_pnet(&x->xs_net);
272 }
273
274 /* xflags - make enum if more show up */
275 #define XFRM_TIME_DEFER 1
276 #define XFRM_SOFT_EXPIRE 2
277
278 enum {
279 XFRM_STATE_VOID,
280 XFRM_STATE_ACQ,
281 XFRM_STATE_VALID,
282 XFRM_STATE_ERROR,
283 XFRM_STATE_EXPIRED,
284 XFRM_STATE_DEAD
285 };
286
287 /* callback structure passed from either netlink or pfkey */
288 struct km_event {
289 union {
290 u32 hard;
291 u32 proto;
292 u32 byid;
293 u32 aevent;
294 u32 type;
295 } data;
296
297 u32 seq;
298 u32 portid;
299 u32 event;
300 struct net *net;
301 };
302
303 struct xfrm_replay {
304 void (*advance)(struct xfrm_state *x, __be32 net_seq);
305 int (*check)(struct xfrm_state *x,
306 struct sk_buff *skb,
307 __be32 net_seq);
308 int (*recheck)(struct xfrm_state *x,
309 struct sk_buff *skb,
310 __be32 net_seq);
311 void (*notify)(struct xfrm_state *x, int event);
312 int (*overflow)(struct xfrm_state *x, struct sk_buff *skb);
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 char *description;
395 struct module *owner;
396 u8 proto;
397 u8 flags;
398 #define XFRM_TYPE_NON_FRAGMENT 1
399 #define XFRM_TYPE_REPLAY_PROT 2
400 #define XFRM_TYPE_LOCAL_COADDR 4
401 #define XFRM_TYPE_REMOTE_COADDR 8
402
403 int (*init_state)(struct xfrm_state *x);
404 void (*destructor)(struct xfrm_state *);
405 int (*input)(struct xfrm_state *, struct sk_buff *skb);
406 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
407 int (*reject)(struct xfrm_state *, struct sk_buff *,
408 const struct flowi *);
409 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
410 };
411
412 int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
413 void xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
414
415 struct xfrm_type_offload {
416 char *description;
417 struct module *owner;
418 u8 proto;
419 void (*encap)(struct xfrm_state *, struct sk_buff *pskb);
420 int (*input_tail)(struct xfrm_state *x, struct sk_buff *skb);
421 int (*xmit)(struct xfrm_state *, struct sk_buff *pskb, netdev_features_t features);
422 };
423
424 int xfrm_register_type_offload(const struct xfrm_type_offload *type, unsigned short family);
425 void xfrm_unregister_type_offload(const struct xfrm_type_offload *type, unsigned short family);
426
xfrm_af2proto(unsigned int family)427 static inline int xfrm_af2proto(unsigned int family)
428 {
429 switch(family) {
430 case AF_INET:
431 return IPPROTO_IPIP;
432 case AF_INET6:
433 return IPPROTO_IPV6;
434 default:
435 return 0;
436 }
437 }
438
xfrm_ip2inner_mode(struct xfrm_state * x,int ipproto)439 static inline const struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
440 {
441 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
442 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
443 return &x->inner_mode;
444 else
445 return &x->inner_mode_iaf;
446 }
447
448 struct xfrm_tmpl {
449 /* id in template is interpreted as:
450 * daddr - destination of tunnel, may be zero for transport mode.
451 * spi - zero to acquire spi. Not zero if spi is static, then
452 * daddr must be fixed too.
453 * proto - AH/ESP/IPCOMP
454 */
455 struct xfrm_id id;
456
457 /* Source address of tunnel. Ignored, if it is not a tunnel. */
458 xfrm_address_t saddr;
459
460 unsigned short encap_family;
461
462 u32 reqid;
463
464 /* Mode: transport, tunnel etc. */
465 u8 mode;
466
467 /* Sharing mode: unique, this session only, this user only etc. */
468 u8 share;
469
470 /* May skip this transfomration if no SA is found */
471 u8 optional;
472
473 /* Skip aalgos/ealgos/calgos checks. */
474 u8 allalgs;
475
476 /* Bit mask of algos allowed for acquisition */
477 u32 aalgos;
478 u32 ealgos;
479 u32 calgos;
480 };
481
482 #define XFRM_MAX_DEPTH 6
483 #define XFRM_MAX_OFFLOAD_DEPTH 1
484
485 struct xfrm_policy_walk_entry {
486 struct list_head all;
487 u8 dead;
488 };
489
490 struct xfrm_policy_walk {
491 struct xfrm_policy_walk_entry walk;
492 u8 type;
493 u32 seq;
494 };
495
496 struct xfrm_policy_queue {
497 struct sk_buff_head hold_queue;
498 struct timer_list hold_timer;
499 unsigned long timeout;
500 };
501
502 struct xfrm_policy {
503 possible_net_t xp_net;
504 struct hlist_node bydst;
505 struct hlist_node byidx;
506
507 /* This lock only affects elements except for entry. */
508 rwlock_t lock;
509 refcount_t refcnt;
510 u32 pos;
511 struct timer_list timer;
512
513 atomic_t genid;
514 u32 priority;
515 u32 index;
516 u32 if_id;
517 struct xfrm_mark mark;
518 struct xfrm_selector selector;
519 struct xfrm_lifetime_cfg lft;
520 struct xfrm_lifetime_cur curlft;
521 struct xfrm_policy_walk_entry walk;
522 struct xfrm_policy_queue polq;
523 bool bydst_reinsert;
524 u8 type;
525 u8 action;
526 u8 flags;
527 u8 xfrm_nr;
528 u16 family;
529 struct xfrm_sec_ctx *security;
530 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
531 struct hlist_node bydst_inexact_list;
532 struct rcu_head rcu;
533 };
534
xp_net(const struct xfrm_policy * xp)535 static inline struct net *xp_net(const struct xfrm_policy *xp)
536 {
537 return read_pnet(&xp->xp_net);
538 }
539
540 struct xfrm_kmaddress {
541 xfrm_address_t local;
542 xfrm_address_t remote;
543 u32 reserved;
544 u16 family;
545 };
546
547 struct xfrm_migrate {
548 xfrm_address_t old_daddr;
549 xfrm_address_t old_saddr;
550 xfrm_address_t new_daddr;
551 xfrm_address_t new_saddr;
552 u8 proto;
553 u8 mode;
554 u16 reserved;
555 u32 reqid;
556 u16 old_family;
557 u16 new_family;
558 };
559
560 #define XFRM_KM_TIMEOUT 30
561 /* what happened */
562 #define XFRM_REPLAY_UPDATE XFRM_AE_CR
563 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
564
565 /* default aevent timeout in units of 100ms */
566 #define XFRM_AE_ETIME 10
567 /* Async Event timer multiplier */
568 #define XFRM_AE_ETH_M 10
569 /* default seq threshold size */
570 #define XFRM_AE_SEQT_SIZE 2
571
572 struct xfrm_mgr {
573 struct list_head list;
574 int (*notify)(struct xfrm_state *x, const struct km_event *c);
575 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp);
576 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
577 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
578 int (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c);
579 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
580 int (*migrate)(const struct xfrm_selector *sel,
581 u8 dir, u8 type,
582 const struct xfrm_migrate *m,
583 int num_bundles,
584 const struct xfrm_kmaddress *k,
585 const struct xfrm_encap_tmpl *encap);
586 bool (*is_alive)(const struct km_event *c);
587 };
588
589 int xfrm_register_km(struct xfrm_mgr *km);
590 int xfrm_unregister_km(struct xfrm_mgr *km);
591
592 struct xfrm_tunnel_skb_cb {
593 union {
594 struct inet_skb_parm h4;
595 struct inet6_skb_parm h6;
596 } header;
597
598 union {
599 struct ip_tunnel *ip4;
600 struct ip6_tnl *ip6;
601 } tunnel;
602 };
603
604 #define XFRM_TUNNEL_SKB_CB(__skb) ((struct xfrm_tunnel_skb_cb *)&((__skb)->cb[0]))
605
606 /*
607 * This structure is used for the duration where packets are being
608 * transformed by IPsec. As soon as the packet leaves IPsec the
609 * area beyond the generic IP part may be overwritten.
610 */
611 struct xfrm_skb_cb {
612 struct xfrm_tunnel_skb_cb header;
613
614 /* Sequence number for replay protection. */
615 union {
616 struct {
617 __u32 low;
618 __u32 hi;
619 } output;
620 struct {
621 __be32 low;
622 __be32 hi;
623 } input;
624 } seq;
625 };
626
627 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
628
629 /*
630 * This structure is used by the afinfo prepare_input/prepare_output functions
631 * to transmit header information to the mode input/output functions.
632 */
633 struct xfrm_mode_skb_cb {
634 struct xfrm_tunnel_skb_cb header;
635
636 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
637 __be16 id;
638 __be16 frag_off;
639
640 /* IP header length (excluding options or extension headers). */
641 u8 ihl;
642
643 /* TOS for IPv4, class for IPv6. */
644 u8 tos;
645
646 /* TTL for IPv4, hop limitfor IPv6. */
647 u8 ttl;
648
649 /* Protocol for IPv4, NH for IPv6. */
650 u8 protocol;
651
652 /* Option length for IPv4, zero for IPv6. */
653 u8 optlen;
654
655 /* Used by IPv6 only, zero for IPv4. */
656 u8 flow_lbl[3];
657 };
658
659 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
660
661 /*
662 * This structure is used by the input processing to locate the SPI and
663 * related information.
664 */
665 struct xfrm_spi_skb_cb {
666 struct xfrm_tunnel_skb_cb header;
667
668 unsigned int daddroff;
669 unsigned int family;
670 __be32 seq;
671 };
672
673 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
674
675 #ifdef CONFIG_AUDITSYSCALL
xfrm_audit_start(const char * op)676 static inline struct audit_buffer *xfrm_audit_start(const char *op)
677 {
678 struct audit_buffer *audit_buf = NULL;
679
680 if (audit_enabled == AUDIT_OFF)
681 return NULL;
682 audit_buf = audit_log_start(audit_context(), GFP_ATOMIC,
683 AUDIT_MAC_IPSEC_EVENT);
684 if (audit_buf == NULL)
685 return NULL;
686 audit_log_format(audit_buf, "op=%s", op);
687 return audit_buf;
688 }
689
xfrm_audit_helper_usrinfo(bool task_valid,struct audit_buffer * audit_buf)690 static inline void xfrm_audit_helper_usrinfo(bool task_valid,
691 struct audit_buffer *audit_buf)
692 {
693 const unsigned int auid = from_kuid(&init_user_ns, task_valid ?
694 audit_get_loginuid(current) :
695 INVALID_UID);
696 const unsigned int ses = task_valid ? audit_get_sessionid(current) :
697 AUDIT_SID_UNSET;
698
699 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
700 audit_log_task_context(audit_buf);
701 }
702
703 void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid);
704 void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
705 bool task_valid);
706 void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid);
707 void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid);
708 void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
709 struct sk_buff *skb);
710 void xfrm_audit_state_replay(struct xfrm_state *x, struct sk_buff *skb,
711 __be32 net_seq);
712 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
713 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, __be32 net_spi,
714 __be32 net_seq);
715 void xfrm_audit_state_icvfail(struct xfrm_state *x, struct sk_buff *skb,
716 u8 proto);
717 #else
718
xfrm_audit_policy_add(struct xfrm_policy * xp,int result,bool task_valid)719 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
720 bool task_valid)
721 {
722 }
723
xfrm_audit_policy_delete(struct xfrm_policy * xp,int result,bool task_valid)724 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
725 bool task_valid)
726 {
727 }
728
xfrm_audit_state_add(struct xfrm_state * x,int result,bool task_valid)729 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
730 bool task_valid)
731 {
732 }
733
xfrm_audit_state_delete(struct xfrm_state * x,int result,bool task_valid)734 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
735 bool task_valid)
736 {
737 }
738
xfrm_audit_state_replay_overflow(struct xfrm_state * x,struct sk_buff * skb)739 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
740 struct sk_buff *skb)
741 {
742 }
743
xfrm_audit_state_replay(struct xfrm_state * x,struct sk_buff * skb,__be32 net_seq)744 static inline void xfrm_audit_state_replay(struct xfrm_state *x,
745 struct sk_buff *skb, __be32 net_seq)
746 {
747 }
748
xfrm_audit_state_notfound_simple(struct sk_buff * skb,u16 family)749 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
750 u16 family)
751 {
752 }
753
xfrm_audit_state_notfound(struct sk_buff * skb,u16 family,__be32 net_spi,__be32 net_seq)754 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
755 __be32 net_spi, __be32 net_seq)
756 {
757 }
758
xfrm_audit_state_icvfail(struct xfrm_state * x,struct sk_buff * skb,u8 proto)759 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
760 struct sk_buff *skb, u8 proto)
761 {
762 }
763 #endif /* CONFIG_AUDITSYSCALL */
764
xfrm_pol_hold(struct xfrm_policy * policy)765 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
766 {
767 if (likely(policy != NULL))
768 refcount_inc(&policy->refcnt);
769 }
770
771 void xfrm_policy_destroy(struct xfrm_policy *policy);
772
xfrm_pol_put(struct xfrm_policy * policy)773 static inline void xfrm_pol_put(struct xfrm_policy *policy)
774 {
775 if (refcount_dec_and_test(&policy->refcnt))
776 xfrm_policy_destroy(policy);
777 }
778
xfrm_pols_put(struct xfrm_policy ** pols,int npols)779 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
780 {
781 int i;
782 for (i = npols - 1; i >= 0; --i)
783 xfrm_pol_put(pols[i]);
784 }
785
786 void __xfrm_state_destroy(struct xfrm_state *, bool);
787
__xfrm_state_put(struct xfrm_state * x)788 static inline void __xfrm_state_put(struct xfrm_state *x)
789 {
790 refcount_dec(&x->refcnt);
791 }
792
xfrm_state_put(struct xfrm_state * x)793 static inline void xfrm_state_put(struct xfrm_state *x)
794 {
795 if (refcount_dec_and_test(&x->refcnt))
796 __xfrm_state_destroy(x, false);
797 }
798
xfrm_state_put_sync(struct xfrm_state * x)799 static inline void xfrm_state_put_sync(struct xfrm_state *x)
800 {
801 if (refcount_dec_and_test(&x->refcnt))
802 __xfrm_state_destroy(x, true);
803 }
804
xfrm_state_hold(struct xfrm_state * x)805 static inline void xfrm_state_hold(struct xfrm_state *x)
806 {
807 refcount_inc(&x->refcnt);
808 }
809
addr_match(const void * token1,const void * token2,unsigned int prefixlen)810 static inline bool addr_match(const void *token1, const void *token2,
811 unsigned int prefixlen)
812 {
813 const __be32 *a1 = token1;
814 const __be32 *a2 = token2;
815 unsigned int pdw;
816 unsigned int pbi;
817
818 pdw = prefixlen >> 5; /* num of whole u32 in prefix */
819 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
820
821 if (pdw)
822 if (memcmp(a1, a2, pdw << 2))
823 return false;
824
825 if (pbi) {
826 __be32 mask;
827
828 mask = htonl((0xffffffff) << (32 - pbi));
829
830 if ((a1[pdw] ^ a2[pdw]) & mask)
831 return false;
832 }
833
834 return true;
835 }
836
addr4_match(__be32 a1,__be32 a2,u8 prefixlen)837 static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen)
838 {
839 /* C99 6.5.7 (3): u32 << 32 is undefined behaviour */
840 if (sizeof(long) == 4 && prefixlen == 0)
841 return true;
842 return !((a1 ^ a2) & htonl(~0UL << (32 - prefixlen)));
843 }
844
845 static __inline__
xfrm_flowi_sport(const struct flowi * fl,const union flowi_uli * uli)846 __be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli)
847 {
848 __be16 port;
849 switch(fl->flowi_proto) {
850 case IPPROTO_TCP:
851 case IPPROTO_UDP:
852 case IPPROTO_UDPLITE:
853 case IPPROTO_SCTP:
854 port = uli->ports.sport;
855 break;
856 case IPPROTO_ICMP:
857 case IPPROTO_ICMPV6:
858 port = htons(uli->icmpt.type);
859 break;
860 case IPPROTO_MH:
861 port = htons(uli->mht.type);
862 break;
863 case IPPROTO_GRE:
864 port = htons(ntohl(uli->gre_key) >> 16);
865 break;
866 default:
867 port = 0; /*XXX*/
868 }
869 return port;
870 }
871
872 static __inline__
xfrm_flowi_dport(const struct flowi * fl,const union flowi_uli * uli)873 __be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli)
874 {
875 __be16 port;
876 switch(fl->flowi_proto) {
877 case IPPROTO_TCP:
878 case IPPROTO_UDP:
879 case IPPROTO_UDPLITE:
880 case IPPROTO_SCTP:
881 port = uli->ports.dport;
882 break;
883 case IPPROTO_ICMP:
884 case IPPROTO_ICMPV6:
885 port = htons(uli->icmpt.code);
886 break;
887 case IPPROTO_GRE:
888 port = htons(ntohl(uli->gre_key) & 0xffff);
889 break;
890 default:
891 port = 0; /*XXX*/
892 }
893 return port;
894 }
895
896 bool xfrm_selector_match(const struct xfrm_selector *sel,
897 const struct flowi *fl, unsigned short family);
898
899 #ifdef CONFIG_SECURITY_NETWORK_XFRM
900 /* If neither has a context --> match
901 * Otherwise, both must have a context and the sids, doi, alg must match
902 */
xfrm_sec_ctx_match(struct xfrm_sec_ctx * s1,struct xfrm_sec_ctx * s2)903 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
904 {
905 return ((!s1 && !s2) ||
906 (s1 && s2 &&
907 (s1->ctx_sid == s2->ctx_sid) &&
908 (s1->ctx_doi == s2->ctx_doi) &&
909 (s1->ctx_alg == s2->ctx_alg)));
910 }
911 #else
xfrm_sec_ctx_match(struct xfrm_sec_ctx * s1,struct xfrm_sec_ctx * s2)912 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
913 {
914 return true;
915 }
916 #endif
917
918 /* A struct encoding bundle of transformations to apply to some set of flow.
919 *
920 * xdst->child points to the next element of bundle.
921 * dst->xfrm points to an instanse of transformer.
922 *
923 * Due to unfortunate limitations of current routing cache, which we
924 * have no time to fix, it mirrors struct rtable and bound to the same
925 * routing key, including saddr,daddr. However, we can have many of
926 * bundles differing by session id. All the bundles grow from a parent
927 * policy rule.
928 */
929 struct xfrm_dst {
930 union {
931 struct dst_entry dst;
932 struct rtable rt;
933 struct rt6_info rt6;
934 } u;
935 struct dst_entry *route;
936 struct dst_entry *child;
937 struct dst_entry *path;
938 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
939 int num_pols, num_xfrms;
940 u32 xfrm_genid;
941 u32 policy_genid;
942 u32 route_mtu_cached;
943 u32 child_mtu_cached;
944 u32 route_cookie;
945 u32 path_cookie;
946 };
947
xfrm_dst_path(const struct dst_entry * dst)948 static inline struct dst_entry *xfrm_dst_path(const struct dst_entry *dst)
949 {
950 #ifdef CONFIG_XFRM
951 if (dst->xfrm || (dst->flags & DST_XFRM_QUEUE)) {
952 const struct xfrm_dst *xdst = (const struct xfrm_dst *) dst;
953
954 return xdst->path;
955 }
956 #endif
957 return (struct dst_entry *) dst;
958 }
959
xfrm_dst_child(const struct dst_entry * dst)960 static inline struct dst_entry *xfrm_dst_child(const struct dst_entry *dst)
961 {
962 #ifdef CONFIG_XFRM
963 if (dst->xfrm || (dst->flags & DST_XFRM_QUEUE)) {
964 struct xfrm_dst *xdst = (struct xfrm_dst *) dst;
965 return xdst->child;
966 }
967 #endif
968 return NULL;
969 }
970
971 #ifdef CONFIG_XFRM
xfrm_dst_set_child(struct xfrm_dst * xdst,struct dst_entry * child)972 static inline void xfrm_dst_set_child(struct xfrm_dst *xdst, struct dst_entry *child)
973 {
974 xdst->child = child;
975 }
976
xfrm_dst_destroy(struct xfrm_dst * xdst)977 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
978 {
979 xfrm_pols_put(xdst->pols, xdst->num_pols);
980 dst_release(xdst->route);
981 if (likely(xdst->u.dst.xfrm))
982 xfrm_state_put(xdst->u.dst.xfrm);
983 }
984 #endif
985
986 void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
987
988 struct xfrm_if_parms {
989 int link; /* ifindex of underlying L2 interface */
990 u32 if_id; /* interface identifyer */
991 };
992
993 struct xfrm_if {
994 struct xfrm_if __rcu *next; /* next interface in list */
995 struct net_device *dev; /* virtual device associated with interface */
996 struct net *net; /* netns for packet i/o */
997 struct xfrm_if_parms p; /* interface parms */
998
999 struct gro_cells gro_cells;
1000 };
1001
1002 struct xfrm_offload {
1003 /* Output sequence number for replay protection on offloading. */
1004 struct {
1005 __u32 low;
1006 __u32 hi;
1007 } seq;
1008
1009 __u32 flags;
1010 #define SA_DELETE_REQ 1
1011 #define CRYPTO_DONE 2
1012 #define CRYPTO_NEXT_DONE 4
1013 #define CRYPTO_FALLBACK 8
1014 #define XFRM_GSO_SEGMENT 16
1015 #define XFRM_GRO 32
1016 #define XFRM_ESP_NO_TRAILER 64
1017 #define XFRM_DEV_RESUME 128
1018 #define XFRM_XMIT 256
1019
1020 __u32 status;
1021 #define CRYPTO_SUCCESS 1
1022 #define CRYPTO_GENERIC_ERROR 2
1023 #define CRYPTO_TRANSPORT_AH_AUTH_FAILED 4
1024 #define CRYPTO_TRANSPORT_ESP_AUTH_FAILED 8
1025 #define CRYPTO_TUNNEL_AH_AUTH_FAILED 16
1026 #define CRYPTO_TUNNEL_ESP_AUTH_FAILED 32
1027 #define CRYPTO_INVALID_PACKET_SYNTAX 64
1028 #define CRYPTO_INVALID_PROTOCOL 128
1029
1030 __u8 proto;
1031 };
1032
1033 struct sec_path {
1034 int len;
1035 int olen;
1036 int verified_cnt;
1037
1038 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
1039 struct xfrm_offload ovec[XFRM_MAX_OFFLOAD_DEPTH];
1040 };
1041
1042 struct sec_path *secpath_set(struct sk_buff *skb);
1043
1044 static inline void
secpath_reset(struct sk_buff * skb)1045 secpath_reset(struct sk_buff *skb)
1046 {
1047 #ifdef CONFIG_XFRM
1048 skb_ext_del(skb, SKB_EXT_SEC_PATH);
1049 #endif
1050 }
1051
1052 static inline int
xfrm_addr_any(const xfrm_address_t * addr,unsigned short family)1053 xfrm_addr_any(const xfrm_address_t *addr, unsigned short family)
1054 {
1055 switch (family) {
1056 case AF_INET:
1057 return addr->a4 == 0;
1058 case AF_INET6:
1059 return ipv6_addr_any(&addr->in6);
1060 }
1061 return 0;
1062 }
1063
1064 static inline int
__xfrm4_state_addr_cmp(const struct xfrm_tmpl * tmpl,const struct xfrm_state * x)1065 __xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1066 {
1067 return (tmpl->saddr.a4 &&
1068 tmpl->saddr.a4 != x->props.saddr.a4);
1069 }
1070
1071 static inline int
__xfrm6_state_addr_cmp(const struct xfrm_tmpl * tmpl,const struct xfrm_state * x)1072 __xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1073 {
1074 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
1075 !ipv6_addr_equal((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
1076 }
1077
1078 static inline int
xfrm_state_addr_cmp(const struct xfrm_tmpl * tmpl,const struct xfrm_state * x,unsigned short family)1079 xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family)
1080 {
1081 switch (family) {
1082 case AF_INET:
1083 return __xfrm4_state_addr_cmp(tmpl, x);
1084 case AF_INET6:
1085 return __xfrm6_state_addr_cmp(tmpl, x);
1086 }
1087 return !0;
1088 }
1089
1090 #ifdef CONFIG_XFRM
1091 int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb,
1092 unsigned short family);
1093
__xfrm_check_nopolicy(struct net * net,struct sk_buff * skb,int dir)1094 static inline bool __xfrm_check_nopolicy(struct net *net, struct sk_buff *skb,
1095 int dir)
1096 {
1097 if (!net->xfrm.policy_count[dir] && !secpath_exists(skb))
1098 return net->xfrm.policy_default[dir] == XFRM_USERPOLICY_ACCEPT;
1099
1100 return false;
1101 }
1102
__xfrm_check_dev_nopolicy(struct sk_buff * skb,int dir,unsigned short family)1103 static inline bool __xfrm_check_dev_nopolicy(struct sk_buff *skb,
1104 int dir, unsigned short family)
1105 {
1106 if (dir != XFRM_POLICY_OUT && family == AF_INET) {
1107 /* same dst may be used for traffic originating from
1108 * devices with different policy settings.
1109 */
1110 return IPCB(skb)->flags & IPSKB_NOPOLICY;
1111 }
1112 return skb_dst(skb) && (skb_dst(skb)->flags & DST_NOPOLICY);
1113 }
1114
__xfrm_policy_check2(struct sock * sk,int dir,struct sk_buff * skb,unsigned int family,int reverse)1115 static inline int __xfrm_policy_check2(struct sock *sk, int dir,
1116 struct sk_buff *skb,
1117 unsigned int family, int reverse)
1118 {
1119 struct net *net = dev_net(skb->dev);
1120 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
1121
1122 if (sk && sk->sk_policy[XFRM_POLICY_IN])
1123 return __xfrm_policy_check(sk, ndir, skb, family);
1124
1125 return __xfrm_check_nopolicy(net, skb, dir) ||
1126 __xfrm_check_dev_nopolicy(skb, dir, family) ||
1127 __xfrm_policy_check(sk, ndir, skb, family);
1128 }
1129
xfrm_policy_check(struct sock * sk,int dir,struct sk_buff * skb,unsigned short family)1130 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1131 {
1132 return __xfrm_policy_check2(sk, dir, skb, family, 0);
1133 }
1134
xfrm4_policy_check(struct sock * sk,int dir,struct sk_buff * skb)1135 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1136 {
1137 return xfrm_policy_check(sk, dir, skb, AF_INET);
1138 }
1139
xfrm6_policy_check(struct sock * sk,int dir,struct sk_buff * skb)1140 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1141 {
1142 return xfrm_policy_check(sk, dir, skb, AF_INET6);
1143 }
1144
xfrm4_policy_check_reverse(struct sock * sk,int dir,struct sk_buff * skb)1145 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1146 struct sk_buff *skb)
1147 {
1148 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1149 }
1150
xfrm6_policy_check_reverse(struct sock * sk,int dir,struct sk_buff * skb)1151 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1152 struct sk_buff *skb)
1153 {
1154 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1155 }
1156
1157 int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1158 unsigned int family, int reverse);
1159
xfrm_decode_session(struct sk_buff * skb,struct flowi * fl,unsigned int family)1160 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1161 unsigned int family)
1162 {
1163 return __xfrm_decode_session(skb, fl, family, 0);
1164 }
1165
xfrm_decode_session_reverse(struct sk_buff * skb,struct flowi * fl,unsigned int family)1166 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1167 struct flowi *fl,
1168 unsigned int family)
1169 {
1170 return __xfrm_decode_session(skb, fl, family, 1);
1171 }
1172
1173 int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1174
xfrm_route_forward(struct sk_buff * skb,unsigned short family)1175 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1176 {
1177 struct net *net = dev_net(skb->dev);
1178
1179 if (!net->xfrm.policy_count[XFRM_POLICY_OUT] &&
1180 net->xfrm.policy_default[XFRM_POLICY_OUT] == XFRM_USERPOLICY_ACCEPT)
1181 return true;
1182
1183 return (skb_dst(skb)->flags & DST_NOXFRM) ||
1184 __xfrm_route_forward(skb, family);
1185 }
1186
xfrm4_route_forward(struct sk_buff * skb)1187 static inline int xfrm4_route_forward(struct sk_buff *skb)
1188 {
1189 return xfrm_route_forward(skb, AF_INET);
1190 }
1191
xfrm6_route_forward(struct sk_buff * skb)1192 static inline int xfrm6_route_forward(struct sk_buff *skb)
1193 {
1194 return xfrm_route_forward(skb, AF_INET6);
1195 }
1196
1197 int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk);
1198
xfrm_sk_clone_policy(struct sock * sk,const struct sock * osk)1199 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk)
1200 {
1201 if (!sk_fullsock(osk))
1202 return 0;
1203 sk->sk_policy[0] = NULL;
1204 sk->sk_policy[1] = NULL;
1205 if (unlikely(osk->sk_policy[0] || osk->sk_policy[1]))
1206 return __xfrm_sk_clone_policy(sk, osk);
1207 return 0;
1208 }
1209
1210 int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1211
xfrm_sk_free_policy(struct sock * sk)1212 static inline void xfrm_sk_free_policy(struct sock *sk)
1213 {
1214 struct xfrm_policy *pol;
1215
1216 pol = rcu_dereference_protected(sk->sk_policy[0], 1);
1217 if (unlikely(pol != NULL)) {
1218 xfrm_policy_delete(pol, XFRM_POLICY_MAX);
1219 sk->sk_policy[0] = NULL;
1220 }
1221 pol = rcu_dereference_protected(sk->sk_policy[1], 1);
1222 if (unlikely(pol != NULL)) {
1223 xfrm_policy_delete(pol, XFRM_POLICY_MAX+1);
1224 sk->sk_policy[1] = NULL;
1225 }
1226 }
1227
1228 #else
1229
xfrm_sk_free_policy(struct sock * sk)1230 static inline void xfrm_sk_free_policy(struct sock *sk) {}
xfrm_sk_clone_policy(struct sock * sk,const struct sock * osk)1231 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) { return 0; }
xfrm6_route_forward(struct sk_buff * skb)1232 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
xfrm4_route_forward(struct sk_buff * skb)1233 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
xfrm6_policy_check(struct sock * sk,int dir,struct sk_buff * skb)1234 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1235 {
1236 return 1;
1237 }
xfrm4_policy_check(struct sock * sk,int dir,struct sk_buff * skb)1238 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1239 {
1240 return 1;
1241 }
xfrm_policy_check(struct sock * sk,int dir,struct sk_buff * skb,unsigned short family)1242 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1243 {
1244 return 1;
1245 }
xfrm_decode_session_reverse(struct sk_buff * skb,struct flowi * fl,unsigned int family)1246 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1247 struct flowi *fl,
1248 unsigned int family)
1249 {
1250 return -ENOSYS;
1251 }
xfrm4_policy_check_reverse(struct sock * sk,int dir,struct sk_buff * skb)1252 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1253 struct sk_buff *skb)
1254 {
1255 return 1;
1256 }
xfrm6_policy_check_reverse(struct sock * sk,int dir,struct sk_buff * skb)1257 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1258 struct sk_buff *skb)
1259 {
1260 return 1;
1261 }
1262 #endif
1263
1264 static __inline__
xfrm_flowi_daddr(const struct flowi * fl,unsigned short family)1265 xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family)
1266 {
1267 switch (family){
1268 case AF_INET:
1269 return (xfrm_address_t *)&fl->u.ip4.daddr;
1270 case AF_INET6:
1271 return (xfrm_address_t *)&fl->u.ip6.daddr;
1272 }
1273 return NULL;
1274 }
1275
1276 static __inline__
xfrm_flowi_saddr(const struct flowi * fl,unsigned short family)1277 xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family)
1278 {
1279 switch (family){
1280 case AF_INET:
1281 return (xfrm_address_t *)&fl->u.ip4.saddr;
1282 case AF_INET6:
1283 return (xfrm_address_t *)&fl->u.ip6.saddr;
1284 }
1285 return NULL;
1286 }
1287
1288 static __inline__
xfrm_flowi_addr_get(const struct flowi * fl,xfrm_address_t * saddr,xfrm_address_t * daddr,unsigned short family)1289 void xfrm_flowi_addr_get(const struct flowi *fl,
1290 xfrm_address_t *saddr, xfrm_address_t *daddr,
1291 unsigned short family)
1292 {
1293 switch(family) {
1294 case AF_INET:
1295 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4));
1296 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4));
1297 break;
1298 case AF_INET6:
1299 saddr->in6 = fl->u.ip6.saddr;
1300 daddr->in6 = fl->u.ip6.daddr;
1301 break;
1302 }
1303 }
1304
1305 static __inline__ int
__xfrm4_state_addr_check(const struct xfrm_state * x,const xfrm_address_t * daddr,const xfrm_address_t * saddr)1306 __xfrm4_state_addr_check(const struct xfrm_state *x,
1307 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1308 {
1309 if (daddr->a4 == x->id.daddr.a4 &&
1310 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1311 return 1;
1312 return 0;
1313 }
1314
1315 static __inline__ int
__xfrm6_state_addr_check(const struct xfrm_state * x,const xfrm_address_t * daddr,const xfrm_address_t * saddr)1316 __xfrm6_state_addr_check(const struct xfrm_state *x,
1317 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1318 {
1319 if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1320 (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) ||
1321 ipv6_addr_any((struct in6_addr *)saddr) ||
1322 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1323 return 1;
1324 return 0;
1325 }
1326
1327 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)1328 xfrm_state_addr_check(const struct xfrm_state *x,
1329 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1330 unsigned short family)
1331 {
1332 switch (family) {
1333 case AF_INET:
1334 return __xfrm4_state_addr_check(x, daddr, saddr);
1335 case AF_INET6:
1336 return __xfrm6_state_addr_check(x, daddr, saddr);
1337 }
1338 return 0;
1339 }
1340
1341 static __inline__ int
xfrm_state_addr_flow_check(const struct xfrm_state * x,const struct flowi * fl,unsigned short family)1342 xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl,
1343 unsigned short family)
1344 {
1345 switch (family) {
1346 case AF_INET:
1347 return __xfrm4_state_addr_check(x,
1348 (const xfrm_address_t *)&fl->u.ip4.daddr,
1349 (const xfrm_address_t *)&fl->u.ip4.saddr);
1350 case AF_INET6:
1351 return __xfrm6_state_addr_check(x,
1352 (const xfrm_address_t *)&fl->u.ip6.daddr,
1353 (const xfrm_address_t *)&fl->u.ip6.saddr);
1354 }
1355 return 0;
1356 }
1357
xfrm_state_kern(const struct xfrm_state * x)1358 static inline int xfrm_state_kern(const struct xfrm_state *x)
1359 {
1360 return atomic_read(&x->tunnel_users);
1361 }
1362
xfrm_id_proto_valid(u8 proto)1363 static inline bool xfrm_id_proto_valid(u8 proto)
1364 {
1365 switch (proto) {
1366 case IPPROTO_AH:
1367 case IPPROTO_ESP:
1368 case IPPROTO_COMP:
1369 #if IS_ENABLED(CONFIG_IPV6)
1370 case IPPROTO_ROUTING:
1371 case IPPROTO_DSTOPTS:
1372 #endif
1373 return true;
1374 default:
1375 return false;
1376 }
1377 }
1378
1379 /* IPSEC_PROTO_ANY only matches 3 IPsec protocols, 0 could match all. */
xfrm_id_proto_match(u8 proto,u8 userproto)1380 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1381 {
1382 return (!userproto || proto == userproto ||
1383 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1384 proto == IPPROTO_ESP ||
1385 proto == IPPROTO_COMP)));
1386 }
1387
1388 /*
1389 * xfrm algorithm information
1390 */
1391 struct xfrm_algo_aead_info {
1392 char *geniv;
1393 u16 icv_truncbits;
1394 };
1395
1396 struct xfrm_algo_auth_info {
1397 u16 icv_truncbits;
1398 u16 icv_fullbits;
1399 };
1400
1401 struct xfrm_algo_encr_info {
1402 char *geniv;
1403 u16 blockbits;
1404 u16 defkeybits;
1405 };
1406
1407 struct xfrm_algo_comp_info {
1408 u16 threshold;
1409 };
1410
1411 struct xfrm_algo_desc {
1412 char *name;
1413 char *compat;
1414 u8 available:1;
1415 u8 pfkey_supported:1;
1416 union {
1417 struct xfrm_algo_aead_info aead;
1418 struct xfrm_algo_auth_info auth;
1419 struct xfrm_algo_encr_info encr;
1420 struct xfrm_algo_comp_info comp;
1421 } uinfo;
1422 struct sadb_alg desc;
1423 };
1424
1425 /* XFRM protocol handlers. */
1426 struct xfrm4_protocol {
1427 int (*handler)(struct sk_buff *skb);
1428 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1429 int encap_type);
1430 int (*cb_handler)(struct sk_buff *skb, int err);
1431 int (*err_handler)(struct sk_buff *skb, u32 info);
1432
1433 struct xfrm4_protocol __rcu *next;
1434 int priority;
1435 };
1436
1437 struct xfrm6_protocol {
1438 int (*handler)(struct sk_buff *skb);
1439 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1440 int encap_type);
1441 int (*cb_handler)(struct sk_buff *skb, int err);
1442 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1443 u8 type, u8 code, int offset, __be32 info);
1444
1445 struct xfrm6_protocol __rcu *next;
1446 int priority;
1447 };
1448
1449 /* XFRM tunnel handlers. */
1450 struct xfrm_tunnel {
1451 int (*handler)(struct sk_buff *skb);
1452 int (*cb_handler)(struct sk_buff *skb, int err);
1453 int (*err_handler)(struct sk_buff *skb, u32 info);
1454
1455 struct xfrm_tunnel __rcu *next;
1456 int priority;
1457 };
1458
1459 struct xfrm6_tunnel {
1460 int (*handler)(struct sk_buff *skb);
1461 int (*cb_handler)(struct sk_buff *skb, int err);
1462 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1463 u8 type, u8 code, int offset, __be32 info);
1464 struct xfrm6_tunnel __rcu *next;
1465 int priority;
1466 };
1467
1468 void xfrm_init(void);
1469 void xfrm4_init(void);
1470 int xfrm_state_init(struct net *net);
1471 void xfrm_state_fini(struct net *net);
1472 void xfrm4_state_init(void);
1473 void xfrm4_protocol_init(void);
1474 #ifdef CONFIG_XFRM
1475 int xfrm6_init(void);
1476 void xfrm6_fini(void);
1477 int xfrm6_state_init(void);
1478 void xfrm6_state_fini(void);
1479 int xfrm6_protocol_init(void);
1480 void xfrm6_protocol_fini(void);
1481 #else
xfrm6_init(void)1482 static inline int xfrm6_init(void)
1483 {
1484 return 0;
1485 }
xfrm6_fini(void)1486 static inline void xfrm6_fini(void)
1487 {
1488 ;
1489 }
1490 #endif
1491
1492 #ifdef CONFIG_XFRM_STATISTICS
1493 int xfrm_proc_init(struct net *net);
1494 void xfrm_proc_fini(struct net *net);
1495 #endif
1496
1497 int xfrm_sysctl_init(struct net *net);
1498 #ifdef CONFIG_SYSCTL
1499 void xfrm_sysctl_fini(struct net *net);
1500 #else
xfrm_sysctl_fini(struct net * net)1501 static inline void xfrm_sysctl_fini(struct net *net)
1502 {
1503 }
1504 #endif
1505
1506 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
1507 struct xfrm_address_filter *filter);
1508 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1509 int (*func)(struct xfrm_state *, int, void*), void *);
1510 void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net);
1511 struct xfrm_state *xfrm_state_alloc(struct net *net);
1512 void xfrm_state_free(struct xfrm_state *x);
1513 struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr,
1514 const xfrm_address_t *saddr,
1515 const struct flowi *fl,
1516 struct xfrm_tmpl *tmpl,
1517 struct xfrm_policy *pol, int *err,
1518 unsigned short family, u32 if_id);
1519 struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark, u32 if_id,
1520 xfrm_address_t *daddr,
1521 xfrm_address_t *saddr,
1522 unsigned short family,
1523 u8 mode, u8 proto, u32 reqid);
1524 struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
1525 unsigned short family);
1526 int xfrm_state_check_expire(struct xfrm_state *x);
1527 void xfrm_state_insert(struct xfrm_state *x);
1528 int xfrm_state_add(struct xfrm_state *x);
1529 int xfrm_state_update(struct xfrm_state *x);
1530 struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1531 const xfrm_address_t *daddr, __be32 spi,
1532 u8 proto, unsigned short family);
1533 struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1534 const xfrm_address_t *daddr,
1535 const xfrm_address_t *saddr,
1536 u8 proto,
1537 unsigned short family);
1538 #ifdef CONFIG_XFRM_SUB_POLICY
1539 void xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1540 unsigned short family);
1541 void xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1542 unsigned short family);
1543 #else
xfrm_tmpl_sort(struct xfrm_tmpl ** d,struct xfrm_tmpl ** s,int n,unsigned short family)1544 static inline void xfrm_tmpl_sort(struct xfrm_tmpl **d, struct xfrm_tmpl **s,
1545 int n, unsigned short family)
1546 {
1547 }
1548
xfrm_state_sort(struct xfrm_state ** d,struct xfrm_state ** s,int n,unsigned short family)1549 static inline void xfrm_state_sort(struct xfrm_state **d, struct xfrm_state **s,
1550 int n, unsigned short family)
1551 {
1552 }
1553 #endif
1554
1555 struct xfrmk_sadinfo {
1556 u32 sadhcnt; /* current hash bkts */
1557 u32 sadhmcnt; /* max allowed hash bkts */
1558 u32 sadcnt; /* current running count */
1559 };
1560
1561 struct xfrmk_spdinfo {
1562 u32 incnt;
1563 u32 outcnt;
1564 u32 fwdcnt;
1565 u32 inscnt;
1566 u32 outscnt;
1567 u32 fwdscnt;
1568 u32 spdhcnt;
1569 u32 spdhmcnt;
1570 };
1571
1572 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1573 int xfrm_state_delete(struct xfrm_state *x);
1574 int xfrm_state_flush(struct net *net, u8 proto, bool task_valid, bool sync);
1575 int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid);
1576 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1577 void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1578 u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq);
1579 int xfrm_init_replay(struct xfrm_state *x);
1580 u32 xfrm_state_mtu(struct xfrm_state *x, int mtu);
1581 int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload);
1582 int xfrm_init_state(struct xfrm_state *x);
1583 int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type);
1584 int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1585 int xfrm_trans_queue_net(struct net *net, struct sk_buff *skb,
1586 int (*finish)(struct net *, struct sock *,
1587 struct sk_buff *));
1588 int xfrm_trans_queue(struct sk_buff *skb,
1589 int (*finish)(struct net *, struct sock *,
1590 struct sk_buff *));
1591 int xfrm_output_resume(struct sock *sk, struct sk_buff *skb, int err);
1592 int xfrm_output(struct sock *sk, struct sk_buff *skb);
1593
1594 #if IS_ENABLED(CONFIG_NET_PKTGEN)
1595 int pktgen_xfrm_outer_mode_output(struct xfrm_state *x, struct sk_buff *skb);
1596 #endif
1597
1598 void xfrm_local_error(struct sk_buff *skb, int mtu);
1599 int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1600 int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1601 int encap_type);
1602 int xfrm4_transport_finish(struct sk_buff *skb, int async);
1603 int xfrm4_rcv(struct sk_buff *skb);
1604 int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1605
xfrm4_rcv_spi(struct sk_buff * skb,int nexthdr,__be32 spi)1606 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1607 {
1608 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
1609 XFRM_SPI_SKB_CB(skb)->family = AF_INET;
1610 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
1611 return xfrm_input(skb, nexthdr, spi, 0);
1612 }
1613
1614 int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1615 int xfrm4_output_finish(struct sock *sk, struct sk_buff *skb);
1616 int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol);
1617 int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol);
1618 int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1619 int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1620 void xfrm4_local_error(struct sk_buff *skb, u32 mtu);
1621 int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1622 int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi,
1623 struct ip6_tnl *t);
1624 int xfrm6_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1625 int encap_type);
1626 int xfrm6_transport_finish(struct sk_buff *skb, int async);
1627 int xfrm6_rcv_tnl(struct sk_buff *skb, struct ip6_tnl *t);
1628 int xfrm6_rcv(struct sk_buff *skb);
1629 int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1630 xfrm_address_t *saddr, u8 proto);
1631 void xfrm6_local_error(struct sk_buff *skb, u32 mtu);
1632 int xfrm6_protocol_register(struct xfrm6_protocol *handler, unsigned char protocol);
1633 int xfrm6_protocol_deregister(struct xfrm6_protocol *handler, unsigned char protocol);
1634 int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1635 int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1636 __be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1637 __be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr);
1638 int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1639 int xfrm6_output_finish(struct sock *sk, struct sk_buff *skb);
1640 int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1641 u8 **prevhdr);
1642
1643 #ifdef CONFIG_XFRM
1644 void xfrm6_local_rxpmtu(struct sk_buff *skb, u32 mtu);
1645 int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1646 int xfrm6_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1647 int xfrm_user_policy(struct sock *sk, int optname, sockptr_t optval,
1648 int optlen);
1649 #else
xfrm_user_policy(struct sock * sk,int optname,sockptr_t optval,int optlen)1650 static inline int xfrm_user_policy(struct sock *sk, int optname,
1651 sockptr_t optval, int optlen)
1652 {
1653 return -ENOPROTOOPT;
1654 }
1655 #endif
1656
1657 struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, int oif,
1658 const xfrm_address_t *saddr,
1659 const xfrm_address_t *daddr,
1660 int family, u32 mark);
1661
1662 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1663
1664 void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1665 int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1666 int (*func)(struct xfrm_policy *, int, int, void*),
1667 void *);
1668 void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net);
1669 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1670 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net,
1671 const struct xfrm_mark *mark,
1672 u32 if_id, u8 type, int dir,
1673 struct xfrm_selector *sel,
1674 struct xfrm_sec_ctx *ctx, int delete,
1675 int *err);
1676 struct xfrm_policy *xfrm_policy_byid(struct net *net,
1677 const struct xfrm_mark *mark, u32 if_id,
1678 u8 type, int dir, u32 id, int delete,
1679 int *err);
1680 int xfrm_policy_flush(struct net *net, u8 type, bool task_valid);
1681 void xfrm_policy_hash_rebuild(struct net *net);
1682 u32 xfrm_get_acqseq(void);
1683 int verify_spi_info(u8 proto, u32 min, u32 max);
1684 int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1685 struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark,
1686 u8 mode, u32 reqid, u32 if_id, u8 proto,
1687 const xfrm_address_t *daddr,
1688 const xfrm_address_t *saddr, int create,
1689 unsigned short family);
1690 int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1691
1692 #ifdef CONFIG_XFRM_MIGRATE
1693 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1694 const struct xfrm_migrate *m, int num_bundles,
1695 const struct xfrm_kmaddress *k,
1696 const struct xfrm_encap_tmpl *encap);
1697 struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net,
1698 u32 if_id);
1699 struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1700 struct xfrm_migrate *m,
1701 struct xfrm_encap_tmpl *encap);
1702 int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1703 struct xfrm_migrate *m, int num_bundles,
1704 struct xfrm_kmaddress *k, struct net *net,
1705 struct xfrm_encap_tmpl *encap, u32 if_id);
1706 #endif
1707
1708 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1709 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid);
1710 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel,
1711 xfrm_address_t *addr);
1712
1713 void xfrm_input_init(void);
1714 int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1715
1716 void xfrm_probe_algs(void);
1717 int xfrm_count_pfkey_auth_supported(void);
1718 int xfrm_count_pfkey_enc_supported(void);
1719 struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1720 struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1721 struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1722 struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1723 struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1724 struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe);
1725 struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe);
1726 struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe);
1727 struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len,
1728 int probe);
1729
xfrm6_addr_equal(const xfrm_address_t * a,const xfrm_address_t * b)1730 static inline bool xfrm6_addr_equal(const xfrm_address_t *a,
1731 const xfrm_address_t *b)
1732 {
1733 return ipv6_addr_equal((const struct in6_addr *)a,
1734 (const struct in6_addr *)b);
1735 }
1736
xfrm_addr_equal(const xfrm_address_t * a,const xfrm_address_t * b,sa_family_t family)1737 static inline bool xfrm_addr_equal(const xfrm_address_t *a,
1738 const xfrm_address_t *b,
1739 sa_family_t family)
1740 {
1741 switch (family) {
1742 default:
1743 case AF_INET:
1744 return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0;
1745 case AF_INET6:
1746 return xfrm6_addr_equal(a, b);
1747 }
1748 }
1749
xfrm_policy_id2dir(u32 index)1750 static inline int xfrm_policy_id2dir(u32 index)
1751 {
1752 return index & 7;
1753 }
1754
1755 #ifdef CONFIG_XFRM
xfrm_aevent_is_on(struct net * net)1756 static inline int xfrm_aevent_is_on(struct net *net)
1757 {
1758 struct sock *nlsk;
1759 int ret = 0;
1760
1761 rcu_read_lock();
1762 nlsk = rcu_dereference(net->xfrm.nlsk);
1763 if (nlsk)
1764 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1765 rcu_read_unlock();
1766 return ret;
1767 }
1768
xfrm_acquire_is_on(struct net * net)1769 static inline int xfrm_acquire_is_on(struct net *net)
1770 {
1771 struct sock *nlsk;
1772 int ret = 0;
1773
1774 rcu_read_lock();
1775 nlsk = rcu_dereference(net->xfrm.nlsk);
1776 if (nlsk)
1777 ret = netlink_has_listeners(nlsk, XFRMNLGRP_ACQUIRE);
1778 rcu_read_unlock();
1779
1780 return ret;
1781 }
1782 #endif
1783
aead_len(struct xfrm_algo_aead * alg)1784 static inline unsigned int aead_len(struct xfrm_algo_aead *alg)
1785 {
1786 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1787 }
1788
xfrm_alg_len(const struct xfrm_algo * alg)1789 static inline unsigned int xfrm_alg_len(const struct xfrm_algo *alg)
1790 {
1791 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1792 }
1793
xfrm_alg_auth_len(const struct xfrm_algo_auth * alg)1794 static inline unsigned int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg)
1795 {
1796 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1797 }
1798
xfrm_replay_state_esn_len(struct xfrm_replay_state_esn * replay_esn)1799 static inline unsigned int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn)
1800 {
1801 return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32);
1802 }
1803
1804 #ifdef CONFIG_XFRM_MIGRATE
xfrm_replay_clone(struct xfrm_state * x,struct xfrm_state * orig)1805 static inline int xfrm_replay_clone(struct xfrm_state *x,
1806 struct xfrm_state *orig)
1807 {
1808
1809 x->replay_esn = kmemdup(orig->replay_esn,
1810 xfrm_replay_state_esn_len(orig->replay_esn),
1811 GFP_KERNEL);
1812 if (!x->replay_esn)
1813 return -ENOMEM;
1814 x->preplay_esn = kmemdup(orig->preplay_esn,
1815 xfrm_replay_state_esn_len(orig->preplay_esn),
1816 GFP_KERNEL);
1817 if (!x->preplay_esn)
1818 return -ENOMEM;
1819
1820 return 0;
1821 }
1822
xfrm_algo_aead_clone(struct xfrm_algo_aead * orig)1823 static inline struct xfrm_algo_aead *xfrm_algo_aead_clone(struct xfrm_algo_aead *orig)
1824 {
1825 return kmemdup(orig, aead_len(orig), GFP_KERNEL);
1826 }
1827
1828
xfrm_algo_clone(struct xfrm_algo * orig)1829 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1830 {
1831 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1832 }
1833
xfrm_algo_auth_clone(struct xfrm_algo_auth * orig)1834 static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1835 {
1836 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1837 }
1838
xfrm_states_put(struct xfrm_state ** states,int n)1839 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1840 {
1841 int i;
1842 for (i = 0; i < n; i++)
1843 xfrm_state_put(*(states + i));
1844 }
1845
xfrm_states_delete(struct xfrm_state ** states,int n)1846 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1847 {
1848 int i;
1849 for (i = 0; i < n; i++)
1850 xfrm_state_delete(*(states + i));
1851 }
1852 #endif
1853
1854 #ifdef CONFIG_XFRM
xfrm_input_state(struct sk_buff * skb)1855 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1856 {
1857 struct sec_path *sp = skb_sec_path(skb);
1858
1859 return sp->xvec[sp->len - 1];
1860 }
1861 #endif
1862
xfrm_offload(struct sk_buff * skb)1863 static inline struct xfrm_offload *xfrm_offload(struct sk_buff *skb)
1864 {
1865 #ifdef CONFIG_XFRM
1866 struct sec_path *sp = skb_sec_path(skb);
1867
1868 if (!sp || !sp->olen || sp->len != sp->olen)
1869 return NULL;
1870
1871 return &sp->ovec[sp->olen - 1];
1872 #else
1873 return NULL;
1874 #endif
1875 }
1876
1877 void __init xfrm_dev_init(void);
1878
1879 #ifdef CONFIG_XFRM_OFFLOAD
1880 void xfrm_dev_resume(struct sk_buff *skb);
1881 void xfrm_dev_backlog(struct softnet_data *sd);
1882 struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again);
1883 int xfrm_dev_state_add(struct net *net, struct xfrm_state *x,
1884 struct xfrm_user_offload *xuo);
1885 bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x);
1886
xfrm_dev_state_advance_esn(struct xfrm_state * x)1887 static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
1888 {
1889 struct xfrm_state_offload *xso = &x->xso;
1890
1891 if (xso->dev && xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn)
1892 xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn(x);
1893 }
1894
xfrm_dst_offload_ok(struct dst_entry * dst)1895 static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
1896 {
1897 struct xfrm_state *x = dst->xfrm;
1898 struct xfrm_dst *xdst;
1899
1900 if (!x || !x->type_offload)
1901 return false;
1902
1903 xdst = (struct xfrm_dst *) dst;
1904 if (!x->xso.offload_handle && !xdst->child->xfrm)
1905 return true;
1906 if (x->xso.offload_handle && (x->xso.dev == xfrm_dst_path(dst)->dev) &&
1907 !xdst->child->xfrm)
1908 return true;
1909
1910 return false;
1911 }
1912
xfrm_dev_state_delete(struct xfrm_state * x)1913 static inline void xfrm_dev_state_delete(struct xfrm_state *x)
1914 {
1915 struct xfrm_state_offload *xso = &x->xso;
1916
1917 if (xso->dev)
1918 xso->dev->xfrmdev_ops->xdo_dev_state_delete(x);
1919 }
1920
xfrm_dev_state_free(struct xfrm_state * x)1921 static inline void xfrm_dev_state_free(struct xfrm_state *x)
1922 {
1923 struct xfrm_state_offload *xso = &x->xso;
1924 struct net_device *dev = xso->dev;
1925
1926 if (dev && dev->xfrmdev_ops) {
1927 if (dev->xfrmdev_ops->xdo_dev_state_free)
1928 dev->xfrmdev_ops->xdo_dev_state_free(x);
1929 xso->dev = NULL;
1930 dev_put(dev);
1931 }
1932 }
1933 #else
xfrm_dev_resume(struct sk_buff * skb)1934 static inline void xfrm_dev_resume(struct sk_buff *skb)
1935 {
1936 }
1937
xfrm_dev_backlog(struct softnet_data * sd)1938 static inline void xfrm_dev_backlog(struct softnet_data *sd)
1939 {
1940 }
1941
validate_xmit_xfrm(struct sk_buff * skb,netdev_features_t features,bool * again)1942 static inline struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again)
1943 {
1944 return skb;
1945 }
1946
xfrm_dev_state_add(struct net * net,struct xfrm_state * x,struct xfrm_user_offload * xuo)1947 static inline int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, struct xfrm_user_offload *xuo)
1948 {
1949 return 0;
1950 }
1951
xfrm_dev_state_delete(struct xfrm_state * x)1952 static inline void xfrm_dev_state_delete(struct xfrm_state *x)
1953 {
1954 }
1955
xfrm_dev_state_free(struct xfrm_state * x)1956 static inline void xfrm_dev_state_free(struct xfrm_state *x)
1957 {
1958 }
1959
xfrm_dev_offload_ok(struct sk_buff * skb,struct xfrm_state * x)1960 static inline bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x)
1961 {
1962 return false;
1963 }
1964
xfrm_dev_state_advance_esn(struct xfrm_state * x)1965 static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
1966 {
1967 }
1968
xfrm_dst_offload_ok(struct dst_entry * dst)1969 static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
1970 {
1971 return false;
1972 }
1973 #endif
1974
xfrm_mark_get(struct nlattr ** attrs,struct xfrm_mark * m)1975 static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
1976 {
1977 if (attrs[XFRMA_MARK])
1978 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark));
1979 else
1980 m->v = m->m = 0;
1981
1982 return m->v & m->m;
1983 }
1984
xfrm_mark_put(struct sk_buff * skb,const struct xfrm_mark * m)1985 static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m)
1986 {
1987 int ret = 0;
1988
1989 if (m->m | m->v)
1990 ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
1991 return ret;
1992 }
1993
xfrm_smark_get(__u32 mark,struct xfrm_state * x)1994 static inline __u32 xfrm_smark_get(__u32 mark, struct xfrm_state *x)
1995 {
1996 struct xfrm_mark *m = &x->props.smark;
1997
1998 return (m->v & m->m) | (mark & ~m->m);
1999 }
2000
xfrm_if_id_put(struct sk_buff * skb,__u32 if_id)2001 static inline int xfrm_if_id_put(struct sk_buff *skb, __u32 if_id)
2002 {
2003 int ret = 0;
2004
2005 if (if_id)
2006 ret = nla_put_u32(skb, XFRMA_IF_ID, if_id);
2007 return ret;
2008 }
2009
xfrm_tunnel_check(struct sk_buff * skb,struct xfrm_state * x,unsigned int family)2010 static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x,
2011 unsigned int family)
2012 {
2013 bool tunnel = false;
2014
2015 switch(family) {
2016 case AF_INET:
2017 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4)
2018 tunnel = true;
2019 break;
2020 case AF_INET6:
2021 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6)
2022 tunnel = true;
2023 break;
2024 }
2025 if (tunnel && !(x->outer_mode.flags & XFRM_MODE_FLAG_TUNNEL))
2026 return -EINVAL;
2027
2028 return 0;
2029 }
2030
2031 extern const int xfrm_msg_min[XFRM_NR_MSGTYPES];
2032 extern const struct nla_policy xfrma_policy[XFRMA_MAX+1];
2033
2034 struct xfrm_translator {
2035 /* Allocate frag_list and put compat translation there */
2036 int (*alloc_compat)(struct sk_buff *skb, const struct nlmsghdr *src);
2037
2038 /* Allocate nlmsg with 64-bit translaton of received 32-bit message */
2039 struct nlmsghdr *(*rcv_msg_compat)(const struct nlmsghdr *nlh,
2040 int maxtype, const struct nla_policy *policy,
2041 struct netlink_ext_ack *extack);
2042
2043 /* Translate 32-bit user_policy from sockptr */
2044 int (*xlate_user_policy_sockptr)(u8 **pdata32, int optlen);
2045
2046 struct module *owner;
2047 };
2048
2049 #if IS_ENABLED(CONFIG_XFRM_USER_COMPAT)
2050 extern int xfrm_register_translator(struct xfrm_translator *xtr);
2051 extern int xfrm_unregister_translator(struct xfrm_translator *xtr);
2052 extern struct xfrm_translator *xfrm_get_translator(void);
2053 extern void xfrm_put_translator(struct xfrm_translator *xtr);
2054 #else
xfrm_get_translator(void)2055 static inline struct xfrm_translator *xfrm_get_translator(void)
2056 {
2057 return NULL;
2058 }
xfrm_put_translator(struct xfrm_translator * xtr)2059 static inline void xfrm_put_translator(struct xfrm_translator *xtr)
2060 {
2061 }
2062 #endif
2063
2064 #if IS_ENABLED(CONFIG_IPV6)
xfrm6_local_dontfrag(const struct sock * sk)2065 static inline bool xfrm6_local_dontfrag(const struct sock *sk)
2066 {
2067 int proto;
2068
2069 if (!sk || sk->sk_family != AF_INET6)
2070 return false;
2071
2072 proto = sk->sk_protocol;
2073 if (proto == IPPROTO_UDP || proto == IPPROTO_RAW)
2074 return inet6_sk(sk)->dontfrag;
2075
2076 return false;
2077 }
2078 #endif
2079 #endif /* _NET_XFRM_H */
2080