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 /* Data for encapsulator */
197 struct xfrm_encap_tmpl *encap;
198 struct sock __rcu *encap_sk;
199
200 /* Data for care-of address */
201 xfrm_address_t *coaddr;
202
203 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
204 struct xfrm_state *tunnel;
205
206 /* If a tunnel, number of users + 1 */
207 atomic_t tunnel_users;
208
209 /* State for replay detection */
210 struct xfrm_replay_state replay;
211 struct xfrm_replay_state_esn *replay_esn;
212
213 /* Replay detection state at the time we sent the last notification */
214 struct xfrm_replay_state preplay;
215 struct xfrm_replay_state_esn *preplay_esn;
216
217 /* The functions for replay detection. */
218 const struct xfrm_replay *repl;
219
220 /* internal flag that only holds state for delayed aevent at the
221 * moment
222 */
223 u32 xflags;
224
225 /* Replay detection notification settings */
226 u32 replay_maxage;
227 u32 replay_maxdiff;
228
229 /* Replay detection notification timer */
230 struct timer_list rtimer;
231
232 /* Statistics */
233 struct xfrm_stats stats;
234
235 struct xfrm_lifetime_cur curlft;
236 struct hrtimer mtimer;
237
238 struct xfrm_state_offload xso;
239
240 /* used to fix curlft->add_time when changing date */
241 long saved_tmo;
242
243 /* Last used time */
244 time64_t lastused;
245
246 struct page_frag xfrag;
247
248 /* Reference to data common to all the instances of this
249 * transformer. */
250 const struct xfrm_type *type;
251 struct xfrm_mode inner_mode;
252 struct xfrm_mode inner_mode_iaf;
253 struct xfrm_mode outer_mode;
254
255 const struct xfrm_type_offload *type_offload;
256
257 /* Security context */
258 struct xfrm_sec_ctx *security;
259
260 /* Private data of this transformer, format is opaque,
261 * interpreted by xfrm_type methods. */
262 void *data;
263 };
264
xs_net(struct xfrm_state * x)265 static inline struct net *xs_net(struct xfrm_state *x)
266 {
267 return read_pnet(&x->xs_net);
268 }
269
270 /* xflags - make enum if more show up */
271 #define XFRM_TIME_DEFER 1
272 #define XFRM_SOFT_EXPIRE 2
273
274 enum {
275 XFRM_STATE_VOID,
276 XFRM_STATE_ACQ,
277 XFRM_STATE_VALID,
278 XFRM_STATE_ERROR,
279 XFRM_STATE_EXPIRED,
280 XFRM_STATE_DEAD
281 };
282
283 /* callback structure passed from either netlink or pfkey */
284 struct km_event {
285 union {
286 u32 hard;
287 u32 proto;
288 u32 byid;
289 u32 aevent;
290 u32 type;
291 } data;
292
293 u32 seq;
294 u32 portid;
295 u32 event;
296 struct net *net;
297 };
298
299 struct xfrm_replay {
300 void (*advance)(struct xfrm_state *x, __be32 net_seq);
301 int (*check)(struct xfrm_state *x,
302 struct sk_buff *skb,
303 __be32 net_seq);
304 int (*recheck)(struct xfrm_state *x,
305 struct sk_buff *skb,
306 __be32 net_seq);
307 void (*notify)(struct xfrm_state *x, int event);
308 int (*overflow)(struct xfrm_state *x, struct sk_buff *skb);
309 };
310
311 struct xfrm_if_cb {
312 struct xfrm_if *(*decode_session)(struct sk_buff *skb,
313 unsigned short family);
314 };
315
316 void xfrm_if_register_cb(const struct xfrm_if_cb *ifcb);
317 void xfrm_if_unregister_cb(void);
318
319 struct net_device;
320 struct xfrm_type;
321 struct xfrm_dst;
322 struct xfrm_policy_afinfo {
323 struct dst_ops *dst_ops;
324 struct dst_entry *(*dst_lookup)(struct net *net,
325 int tos, int oif,
326 const xfrm_address_t *saddr,
327 const xfrm_address_t *daddr,
328 u32 mark);
329 int (*get_saddr)(struct net *net, int oif,
330 xfrm_address_t *saddr,
331 xfrm_address_t *daddr,
332 u32 mark);
333 int (*fill_dst)(struct xfrm_dst *xdst,
334 struct net_device *dev,
335 const struct flowi *fl);
336 struct dst_entry *(*blackhole_route)(struct net *net, struct dst_entry *orig);
337 };
338
339 int xfrm_policy_register_afinfo(const struct xfrm_policy_afinfo *afinfo, int family);
340 void xfrm_policy_unregister_afinfo(const struct xfrm_policy_afinfo *afinfo);
341 void km_policy_notify(struct xfrm_policy *xp, int dir,
342 const struct km_event *c);
343 void km_state_notify(struct xfrm_state *x, const struct km_event *c);
344
345 struct xfrm_tmpl;
346 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t,
347 struct xfrm_policy *pol);
348 void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
349 int __xfrm_state_delete(struct xfrm_state *x);
350
351 struct xfrm_state_afinfo {
352 u8 family;
353 u8 proto;
354
355 const struct xfrm_type_offload *type_offload_esp;
356
357 const struct xfrm_type *type_esp;
358 const struct xfrm_type *type_ipip;
359 const struct xfrm_type *type_ipip6;
360 const struct xfrm_type *type_comp;
361 const struct xfrm_type *type_ah;
362 const struct xfrm_type *type_routing;
363 const struct xfrm_type *type_dstopts;
364
365 int (*output)(struct net *net, struct sock *sk, struct sk_buff *skb);
366 int (*transport_finish)(struct sk_buff *skb,
367 int async);
368 void (*local_error)(struct sk_buff *skb, u32 mtu);
369 };
370
371 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
372 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
373 struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family);
374 struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family);
375
376 struct xfrm_input_afinfo {
377 u8 family;
378 bool is_ipip;
379 int (*callback)(struct sk_buff *skb, u8 protocol,
380 int err);
381 };
382
383 int xfrm_input_register_afinfo(const struct xfrm_input_afinfo *afinfo);
384 int xfrm_input_unregister_afinfo(const struct xfrm_input_afinfo *afinfo);
385
386 void xfrm_flush_gc(void);
387 void xfrm_state_delete_tunnel(struct xfrm_state *x);
388
389 struct xfrm_type {
390 char *description;
391 struct module *owner;
392 u8 proto;
393 u8 flags;
394 #define XFRM_TYPE_NON_FRAGMENT 1
395 #define XFRM_TYPE_REPLAY_PROT 2
396 #define XFRM_TYPE_LOCAL_COADDR 4
397 #define XFRM_TYPE_REMOTE_COADDR 8
398
399 int (*init_state)(struct xfrm_state *x);
400 void (*destructor)(struct xfrm_state *);
401 int (*input)(struct xfrm_state *, struct sk_buff *skb);
402 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
403 int (*reject)(struct xfrm_state *, struct sk_buff *,
404 const struct flowi *);
405 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
406 };
407
408 int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
409 void xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
410
411 struct xfrm_type_offload {
412 char *description;
413 struct module *owner;
414 u8 proto;
415 void (*encap)(struct xfrm_state *, struct sk_buff *pskb);
416 int (*input_tail)(struct xfrm_state *x, struct sk_buff *skb);
417 int (*xmit)(struct xfrm_state *, struct sk_buff *pskb, netdev_features_t features);
418 };
419
420 int xfrm_register_type_offload(const struct xfrm_type_offload *type, unsigned short family);
421 void xfrm_unregister_type_offload(const struct xfrm_type_offload *type, unsigned short family);
422
xfrm_af2proto(unsigned int family)423 static inline int xfrm_af2proto(unsigned int family)
424 {
425 switch(family) {
426 case AF_INET:
427 return IPPROTO_IPIP;
428 case AF_INET6:
429 return IPPROTO_IPV6;
430 default:
431 return 0;
432 }
433 }
434
xfrm_ip2inner_mode(struct xfrm_state * x,int ipproto)435 static inline const struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
436 {
437 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
438 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
439 return &x->inner_mode;
440 else
441 return &x->inner_mode_iaf;
442 }
443
444 struct xfrm_tmpl {
445 /* id in template is interpreted as:
446 * daddr - destination of tunnel, may be zero for transport mode.
447 * spi - zero to acquire spi. Not zero if spi is static, then
448 * daddr must be fixed too.
449 * proto - AH/ESP/IPCOMP
450 */
451 struct xfrm_id id;
452
453 /* Source address of tunnel. Ignored, if it is not a tunnel. */
454 xfrm_address_t saddr;
455
456 unsigned short encap_family;
457
458 u32 reqid;
459
460 /* Mode: transport, tunnel etc. */
461 u8 mode;
462
463 /* Sharing mode: unique, this session only, this user only etc. */
464 u8 share;
465
466 /* May skip this transfomration if no SA is found */
467 u8 optional;
468
469 /* Skip aalgos/ealgos/calgos checks. */
470 u8 allalgs;
471
472 /* Bit mask of algos allowed for acquisition */
473 u32 aalgos;
474 u32 ealgos;
475 u32 calgos;
476 };
477
478 #define XFRM_MAX_DEPTH 6
479 #define XFRM_MAX_OFFLOAD_DEPTH 1
480
481 struct xfrm_policy_walk_entry {
482 struct list_head all;
483 u8 dead;
484 };
485
486 struct xfrm_policy_walk {
487 struct xfrm_policy_walk_entry walk;
488 u8 type;
489 u32 seq;
490 };
491
492 struct xfrm_policy_queue {
493 struct sk_buff_head hold_queue;
494 struct timer_list hold_timer;
495 unsigned long timeout;
496 };
497
498 struct xfrm_policy {
499 possible_net_t xp_net;
500 struct hlist_node bydst;
501 struct hlist_node byidx;
502
503 /* This lock only affects elements except for entry. */
504 rwlock_t lock;
505 refcount_t refcnt;
506 u32 pos;
507 struct timer_list timer;
508
509 atomic_t genid;
510 u32 priority;
511 u32 index;
512 u32 if_id;
513 struct xfrm_mark mark;
514 struct xfrm_selector selector;
515 struct xfrm_lifetime_cfg lft;
516 struct xfrm_lifetime_cur curlft;
517 struct xfrm_policy_walk_entry walk;
518 struct xfrm_policy_queue polq;
519 bool bydst_reinsert;
520 u8 type;
521 u8 action;
522 u8 flags;
523 u8 xfrm_nr;
524 u16 family;
525 struct xfrm_sec_ctx *security;
526 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
527 struct hlist_node bydst_inexact_list;
528 struct rcu_head rcu;
529 };
530
xp_net(const struct xfrm_policy * xp)531 static inline struct net *xp_net(const struct xfrm_policy *xp)
532 {
533 return read_pnet(&xp->xp_net);
534 }
535
536 struct xfrm_kmaddress {
537 xfrm_address_t local;
538 xfrm_address_t remote;
539 u32 reserved;
540 u16 family;
541 };
542
543 struct xfrm_migrate {
544 xfrm_address_t old_daddr;
545 xfrm_address_t old_saddr;
546 xfrm_address_t new_daddr;
547 xfrm_address_t new_saddr;
548 u8 proto;
549 u8 mode;
550 u16 reserved;
551 u32 reqid;
552 u16 old_family;
553 u16 new_family;
554 };
555
556 #define XFRM_KM_TIMEOUT 30
557 /* what happened */
558 #define XFRM_REPLAY_UPDATE XFRM_AE_CR
559 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
560
561 /* default aevent timeout in units of 100ms */
562 #define XFRM_AE_ETIME 10
563 /* Async Event timer multiplier */
564 #define XFRM_AE_ETH_M 10
565 /* default seq threshold size */
566 #define XFRM_AE_SEQT_SIZE 2
567
568 struct xfrm_mgr {
569 struct list_head list;
570 int (*notify)(struct xfrm_state *x, const struct km_event *c);
571 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp);
572 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
573 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
574 int (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c);
575 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
576 int (*migrate)(const struct xfrm_selector *sel,
577 u8 dir, u8 type,
578 const struct xfrm_migrate *m,
579 int num_bundles,
580 const struct xfrm_kmaddress *k,
581 const struct xfrm_encap_tmpl *encap);
582 bool (*is_alive)(const struct km_event *c);
583 };
584
585 int xfrm_register_km(struct xfrm_mgr *km);
586 int xfrm_unregister_km(struct xfrm_mgr *km);
587
588 struct xfrm_tunnel_skb_cb {
589 union {
590 struct inet_skb_parm h4;
591 struct inet6_skb_parm h6;
592 } header;
593
594 union {
595 struct ip_tunnel *ip4;
596 struct ip6_tnl *ip6;
597 } tunnel;
598 };
599
600 #define XFRM_TUNNEL_SKB_CB(__skb) ((struct xfrm_tunnel_skb_cb *)&((__skb)->cb[0]))
601
602 /*
603 * This structure is used for the duration where packets are being
604 * transformed by IPsec. As soon as the packet leaves IPsec the
605 * area beyond the generic IP part may be overwritten.
606 */
607 struct xfrm_skb_cb {
608 struct xfrm_tunnel_skb_cb header;
609
610 /* Sequence number for replay protection. */
611 union {
612 struct {
613 __u32 low;
614 __u32 hi;
615 } output;
616 struct {
617 __be32 low;
618 __be32 hi;
619 } input;
620 } seq;
621 };
622
623 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
624
625 /*
626 * This structure is used by the afinfo prepare_input/prepare_output functions
627 * to transmit header information to the mode input/output functions.
628 */
629 struct xfrm_mode_skb_cb {
630 struct xfrm_tunnel_skb_cb header;
631
632 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
633 __be16 id;
634 __be16 frag_off;
635
636 /* IP header length (excluding options or extension headers). */
637 u8 ihl;
638
639 /* TOS for IPv4, class for IPv6. */
640 u8 tos;
641
642 /* TTL for IPv4, hop limitfor IPv6. */
643 u8 ttl;
644
645 /* Protocol for IPv4, NH for IPv6. */
646 u8 protocol;
647
648 /* Option length for IPv4, zero for IPv6. */
649 u8 optlen;
650
651 /* Used by IPv6 only, zero for IPv4. */
652 u8 flow_lbl[3];
653 };
654
655 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
656
657 /*
658 * This structure is used by the input processing to locate the SPI and
659 * related information.
660 */
661 struct xfrm_spi_skb_cb {
662 struct xfrm_tunnel_skb_cb header;
663
664 unsigned int daddroff;
665 unsigned int family;
666 __be32 seq;
667 };
668
669 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
670
671 #ifdef CONFIG_AUDITSYSCALL
xfrm_audit_start(const char * op)672 static inline struct audit_buffer *xfrm_audit_start(const char *op)
673 {
674 struct audit_buffer *audit_buf = NULL;
675
676 if (audit_enabled == AUDIT_OFF)
677 return NULL;
678 audit_buf = audit_log_start(audit_context(), GFP_ATOMIC,
679 AUDIT_MAC_IPSEC_EVENT);
680 if (audit_buf == NULL)
681 return NULL;
682 audit_log_format(audit_buf, "op=%s", op);
683 return audit_buf;
684 }
685
xfrm_audit_helper_usrinfo(bool task_valid,struct audit_buffer * audit_buf)686 static inline void xfrm_audit_helper_usrinfo(bool task_valid,
687 struct audit_buffer *audit_buf)
688 {
689 const unsigned int auid = from_kuid(&init_user_ns, task_valid ?
690 audit_get_loginuid(current) :
691 INVALID_UID);
692 const unsigned int ses = task_valid ? audit_get_sessionid(current) :
693 AUDIT_SID_UNSET;
694
695 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
696 audit_log_task_context(audit_buf);
697 }
698
699 void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid);
700 void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
701 bool task_valid);
702 void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid);
703 void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid);
704 void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
705 struct sk_buff *skb);
706 void xfrm_audit_state_replay(struct xfrm_state *x, struct sk_buff *skb,
707 __be32 net_seq);
708 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
709 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, __be32 net_spi,
710 __be32 net_seq);
711 void xfrm_audit_state_icvfail(struct xfrm_state *x, struct sk_buff *skb,
712 u8 proto);
713 #else
714
xfrm_audit_policy_add(struct xfrm_policy * xp,int result,bool task_valid)715 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
716 bool task_valid)
717 {
718 }
719
xfrm_audit_policy_delete(struct xfrm_policy * xp,int result,bool task_valid)720 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
721 bool task_valid)
722 {
723 }
724
xfrm_audit_state_add(struct xfrm_state * x,int result,bool task_valid)725 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
726 bool task_valid)
727 {
728 }
729
xfrm_audit_state_delete(struct xfrm_state * x,int result,bool task_valid)730 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
731 bool task_valid)
732 {
733 }
734
xfrm_audit_state_replay_overflow(struct xfrm_state * x,struct sk_buff * skb)735 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
736 struct sk_buff *skb)
737 {
738 }
739
xfrm_audit_state_replay(struct xfrm_state * x,struct sk_buff * skb,__be32 net_seq)740 static inline void xfrm_audit_state_replay(struct xfrm_state *x,
741 struct sk_buff *skb, __be32 net_seq)
742 {
743 }
744
xfrm_audit_state_notfound_simple(struct sk_buff * skb,u16 family)745 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
746 u16 family)
747 {
748 }
749
xfrm_audit_state_notfound(struct sk_buff * skb,u16 family,__be32 net_spi,__be32 net_seq)750 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
751 __be32 net_spi, __be32 net_seq)
752 {
753 }
754
xfrm_audit_state_icvfail(struct xfrm_state * x,struct sk_buff * skb,u8 proto)755 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
756 struct sk_buff *skb, u8 proto)
757 {
758 }
759 #endif /* CONFIG_AUDITSYSCALL */
760
xfrm_pol_hold(struct xfrm_policy * policy)761 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
762 {
763 if (likely(policy != NULL))
764 refcount_inc(&policy->refcnt);
765 }
766
767 void xfrm_policy_destroy(struct xfrm_policy *policy);
768
xfrm_pol_put(struct xfrm_policy * policy)769 static inline void xfrm_pol_put(struct xfrm_policy *policy)
770 {
771 if (refcount_dec_and_test(&policy->refcnt))
772 xfrm_policy_destroy(policy);
773 }
774
xfrm_pols_put(struct xfrm_policy ** pols,int npols)775 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
776 {
777 int i;
778 for (i = npols - 1; i >= 0; --i)
779 xfrm_pol_put(pols[i]);
780 }
781
782 void __xfrm_state_destroy(struct xfrm_state *, bool);
783
__xfrm_state_put(struct xfrm_state * x)784 static inline void __xfrm_state_put(struct xfrm_state *x)
785 {
786 refcount_dec(&x->refcnt);
787 }
788
xfrm_state_put(struct xfrm_state * x)789 static inline void xfrm_state_put(struct xfrm_state *x)
790 {
791 if (refcount_dec_and_test(&x->refcnt))
792 __xfrm_state_destroy(x, false);
793 }
794
xfrm_state_put_sync(struct xfrm_state * x)795 static inline void xfrm_state_put_sync(struct xfrm_state *x)
796 {
797 if (refcount_dec_and_test(&x->refcnt))
798 __xfrm_state_destroy(x, true);
799 }
800
xfrm_state_hold(struct xfrm_state * x)801 static inline void xfrm_state_hold(struct xfrm_state *x)
802 {
803 refcount_inc(&x->refcnt);
804 }
805
addr_match(const void * token1,const void * token2,unsigned int prefixlen)806 static inline bool addr_match(const void *token1, const void *token2,
807 unsigned int prefixlen)
808 {
809 const __be32 *a1 = token1;
810 const __be32 *a2 = token2;
811 unsigned int pdw;
812 unsigned int pbi;
813
814 pdw = prefixlen >> 5; /* num of whole u32 in prefix */
815 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
816
817 if (pdw)
818 if (memcmp(a1, a2, pdw << 2))
819 return false;
820
821 if (pbi) {
822 __be32 mask;
823
824 mask = htonl((0xffffffff) << (32 - pbi));
825
826 if ((a1[pdw] ^ a2[pdw]) & mask)
827 return false;
828 }
829
830 return true;
831 }
832
addr4_match(__be32 a1,__be32 a2,u8 prefixlen)833 static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen)
834 {
835 /* C99 6.5.7 (3): u32 << 32 is undefined behaviour */
836 if (sizeof(long) == 4 && prefixlen == 0)
837 return true;
838 return !((a1 ^ a2) & htonl(~0UL << (32 - prefixlen)));
839 }
840
841 static __inline__
xfrm_flowi_sport(const struct flowi * fl,const union flowi_uli * uli)842 __be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli)
843 {
844 __be16 port;
845 switch(fl->flowi_proto) {
846 case IPPROTO_TCP:
847 case IPPROTO_UDP:
848 case IPPROTO_UDPLITE:
849 case IPPROTO_SCTP:
850 port = uli->ports.sport;
851 break;
852 case IPPROTO_ICMP:
853 case IPPROTO_ICMPV6:
854 port = htons(uli->icmpt.type);
855 break;
856 case IPPROTO_MH:
857 port = htons(uli->mht.type);
858 break;
859 case IPPROTO_GRE:
860 port = htons(ntohl(uli->gre_key) >> 16);
861 break;
862 default:
863 port = 0; /*XXX*/
864 }
865 return port;
866 }
867
868 static __inline__
xfrm_flowi_dport(const struct flowi * fl,const union flowi_uli * uli)869 __be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli)
870 {
871 __be16 port;
872 switch(fl->flowi_proto) {
873 case IPPROTO_TCP:
874 case IPPROTO_UDP:
875 case IPPROTO_UDPLITE:
876 case IPPROTO_SCTP:
877 port = uli->ports.dport;
878 break;
879 case IPPROTO_ICMP:
880 case IPPROTO_ICMPV6:
881 port = htons(uli->icmpt.code);
882 break;
883 case IPPROTO_GRE:
884 port = htons(ntohl(uli->gre_key) & 0xffff);
885 break;
886 default:
887 port = 0; /*XXX*/
888 }
889 return port;
890 }
891
892 bool xfrm_selector_match(const struct xfrm_selector *sel,
893 const struct flowi *fl, unsigned short family);
894
895 #ifdef CONFIG_SECURITY_NETWORK_XFRM
896 /* If neither has a context --> match
897 * Otherwise, both must have a context and the sids, doi, alg must match
898 */
xfrm_sec_ctx_match(struct xfrm_sec_ctx * s1,struct xfrm_sec_ctx * s2)899 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
900 {
901 return ((!s1 && !s2) ||
902 (s1 && s2 &&
903 (s1->ctx_sid == s2->ctx_sid) &&
904 (s1->ctx_doi == s2->ctx_doi) &&
905 (s1->ctx_alg == s2->ctx_alg)));
906 }
907 #else
xfrm_sec_ctx_match(struct xfrm_sec_ctx * s1,struct xfrm_sec_ctx * s2)908 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
909 {
910 return true;
911 }
912 #endif
913
914 /* A struct encoding bundle of transformations to apply to some set of flow.
915 *
916 * xdst->child points to the next element of bundle.
917 * dst->xfrm points to an instanse of transformer.
918 *
919 * Due to unfortunate limitations of current routing cache, which we
920 * have no time to fix, it mirrors struct rtable and bound to the same
921 * routing key, including saddr,daddr. However, we can have many of
922 * bundles differing by session id. All the bundles grow from a parent
923 * policy rule.
924 */
925 struct xfrm_dst {
926 union {
927 struct dst_entry dst;
928 struct rtable rt;
929 struct rt6_info rt6;
930 } u;
931 struct dst_entry *route;
932 struct dst_entry *child;
933 struct dst_entry *path;
934 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
935 int num_pols, num_xfrms;
936 u32 xfrm_genid;
937 u32 policy_genid;
938 u32 route_mtu_cached;
939 u32 child_mtu_cached;
940 u32 route_cookie;
941 u32 path_cookie;
942 };
943
xfrm_dst_path(const struct dst_entry * dst)944 static inline struct dst_entry *xfrm_dst_path(const struct dst_entry *dst)
945 {
946 #ifdef CONFIG_XFRM
947 if (dst->xfrm || (dst->flags & DST_XFRM_QUEUE)) {
948 const struct xfrm_dst *xdst = (const struct xfrm_dst *) dst;
949
950 return xdst->path;
951 }
952 #endif
953 return (struct dst_entry *) dst;
954 }
955
xfrm_dst_child(const struct dst_entry * dst)956 static inline struct dst_entry *xfrm_dst_child(const struct dst_entry *dst)
957 {
958 #ifdef CONFIG_XFRM
959 if (dst->xfrm || (dst->flags & DST_XFRM_QUEUE)) {
960 struct xfrm_dst *xdst = (struct xfrm_dst *) dst;
961 return xdst->child;
962 }
963 #endif
964 return NULL;
965 }
966
967 #ifdef CONFIG_XFRM
xfrm_dst_set_child(struct xfrm_dst * xdst,struct dst_entry * child)968 static inline void xfrm_dst_set_child(struct xfrm_dst *xdst, struct dst_entry *child)
969 {
970 xdst->child = child;
971 }
972
xfrm_dst_destroy(struct xfrm_dst * xdst)973 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
974 {
975 xfrm_pols_put(xdst->pols, xdst->num_pols);
976 dst_release(xdst->route);
977 if (likely(xdst->u.dst.xfrm))
978 xfrm_state_put(xdst->u.dst.xfrm);
979 }
980 #endif
981
982 void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
983
984 struct xfrm_if_parms {
985 int link; /* ifindex of underlying L2 interface */
986 u32 if_id; /* interface identifyer */
987 };
988
989 struct xfrm_if {
990 struct xfrm_if __rcu *next; /* next interface in list */
991 struct net_device *dev; /* virtual device associated with interface */
992 struct net *net; /* netns for packet i/o */
993 struct xfrm_if_parms p; /* interface parms */
994
995 struct gro_cells gro_cells;
996 };
997
998 struct xfrm_offload {
999 /* Output sequence number for replay protection on offloading. */
1000 struct {
1001 __u32 low;
1002 __u32 hi;
1003 } seq;
1004
1005 __u32 flags;
1006 #define SA_DELETE_REQ 1
1007 #define CRYPTO_DONE 2
1008 #define CRYPTO_NEXT_DONE 4
1009 #define CRYPTO_FALLBACK 8
1010 #define XFRM_GSO_SEGMENT 16
1011 #define XFRM_GRO 32
1012 #define XFRM_ESP_NO_TRAILER 64
1013 #define XFRM_DEV_RESUME 128
1014 #define XFRM_XMIT 256
1015
1016 __u32 status;
1017 #define CRYPTO_SUCCESS 1
1018 #define CRYPTO_GENERIC_ERROR 2
1019 #define CRYPTO_TRANSPORT_AH_AUTH_FAILED 4
1020 #define CRYPTO_TRANSPORT_ESP_AUTH_FAILED 8
1021 #define CRYPTO_TUNNEL_AH_AUTH_FAILED 16
1022 #define CRYPTO_TUNNEL_ESP_AUTH_FAILED 32
1023 #define CRYPTO_INVALID_PACKET_SYNTAX 64
1024 #define CRYPTO_INVALID_PROTOCOL 128
1025
1026 __u8 proto;
1027 };
1028
1029 struct sec_path {
1030 int len;
1031 int olen;
1032 int verified_cnt;
1033
1034 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
1035 struct xfrm_offload ovec[XFRM_MAX_OFFLOAD_DEPTH];
1036 };
1037
1038 struct sec_path *secpath_set(struct sk_buff *skb);
1039
1040 static inline void
secpath_reset(struct sk_buff * skb)1041 secpath_reset(struct sk_buff *skb)
1042 {
1043 #ifdef CONFIG_XFRM
1044 skb_ext_del(skb, SKB_EXT_SEC_PATH);
1045 #endif
1046 }
1047
1048 static inline int
xfrm_addr_any(const xfrm_address_t * addr,unsigned short family)1049 xfrm_addr_any(const xfrm_address_t *addr, unsigned short family)
1050 {
1051 switch (family) {
1052 case AF_INET:
1053 return addr->a4 == 0;
1054 case AF_INET6:
1055 return ipv6_addr_any(&addr->in6);
1056 }
1057 return 0;
1058 }
1059
1060 static inline int
__xfrm4_state_addr_cmp(const struct xfrm_tmpl * tmpl,const struct xfrm_state * x)1061 __xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1062 {
1063 return (tmpl->saddr.a4 &&
1064 tmpl->saddr.a4 != x->props.saddr.a4);
1065 }
1066
1067 static inline int
__xfrm6_state_addr_cmp(const struct xfrm_tmpl * tmpl,const struct xfrm_state * x)1068 __xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1069 {
1070 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
1071 !ipv6_addr_equal((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
1072 }
1073
1074 static inline int
xfrm_state_addr_cmp(const struct xfrm_tmpl * tmpl,const struct xfrm_state * x,unsigned short family)1075 xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family)
1076 {
1077 switch (family) {
1078 case AF_INET:
1079 return __xfrm4_state_addr_cmp(tmpl, x);
1080 case AF_INET6:
1081 return __xfrm6_state_addr_cmp(tmpl, x);
1082 }
1083 return !0;
1084 }
1085
1086 #ifdef CONFIG_XFRM
1087 int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb,
1088 unsigned short family);
1089
__xfrm_policy_check2(struct sock * sk,int dir,struct sk_buff * skb,unsigned int family,int reverse)1090 static inline int __xfrm_policy_check2(struct sock *sk, int dir,
1091 struct sk_buff *skb,
1092 unsigned int family, int reverse)
1093 {
1094 struct net *net = dev_net(skb->dev);
1095 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
1096
1097 if (sk && sk->sk_policy[XFRM_POLICY_IN])
1098 return __xfrm_policy_check(sk, ndir, skb, family);
1099
1100 return (!net->xfrm.policy_count[dir] && !secpath_exists(skb)) ||
1101 (skb_dst(skb) && (skb_dst(skb)->flags & DST_NOPOLICY)) ||
1102 __xfrm_policy_check(sk, ndir, skb, family);
1103 }
1104
xfrm_policy_check(struct sock * sk,int dir,struct sk_buff * skb,unsigned short family)1105 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1106 {
1107 return __xfrm_policy_check2(sk, dir, skb, family, 0);
1108 }
1109
xfrm4_policy_check(struct sock * sk,int dir,struct sk_buff * skb)1110 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1111 {
1112 return xfrm_policy_check(sk, dir, skb, AF_INET);
1113 }
1114
xfrm6_policy_check(struct sock * sk,int dir,struct sk_buff * skb)1115 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1116 {
1117 return xfrm_policy_check(sk, dir, skb, AF_INET6);
1118 }
1119
xfrm4_policy_check_reverse(struct sock * sk,int dir,struct sk_buff * skb)1120 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1121 struct sk_buff *skb)
1122 {
1123 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1124 }
1125
xfrm6_policy_check_reverse(struct sock * sk,int dir,struct sk_buff * skb)1126 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1127 struct sk_buff *skb)
1128 {
1129 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1130 }
1131
1132 int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1133 unsigned int family, int reverse);
1134
xfrm_decode_session(struct sk_buff * skb,struct flowi * fl,unsigned int family)1135 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1136 unsigned int family)
1137 {
1138 return __xfrm_decode_session(skb, fl, family, 0);
1139 }
1140
xfrm_decode_session_reverse(struct sk_buff * skb,struct flowi * fl,unsigned int family)1141 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1142 struct flowi *fl,
1143 unsigned int family)
1144 {
1145 return __xfrm_decode_session(skb, fl, family, 1);
1146 }
1147
1148 int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1149
xfrm_route_forward(struct sk_buff * skb,unsigned short family)1150 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1151 {
1152 struct net *net = dev_net(skb->dev);
1153
1154 return !net->xfrm.policy_count[XFRM_POLICY_OUT] ||
1155 (skb_dst(skb)->flags & DST_NOXFRM) ||
1156 __xfrm_route_forward(skb, family);
1157 }
1158
xfrm4_route_forward(struct sk_buff * skb)1159 static inline int xfrm4_route_forward(struct sk_buff *skb)
1160 {
1161 return xfrm_route_forward(skb, AF_INET);
1162 }
1163
xfrm6_route_forward(struct sk_buff * skb)1164 static inline int xfrm6_route_forward(struct sk_buff *skb)
1165 {
1166 return xfrm_route_forward(skb, AF_INET6);
1167 }
1168
1169 int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk);
1170
xfrm_sk_clone_policy(struct sock * sk,const struct sock * osk)1171 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk)
1172 {
1173 sk->sk_policy[0] = NULL;
1174 sk->sk_policy[1] = NULL;
1175 if (unlikely(osk->sk_policy[0] || osk->sk_policy[1]))
1176 return __xfrm_sk_clone_policy(sk, osk);
1177 return 0;
1178 }
1179
1180 int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1181
xfrm_sk_free_policy(struct sock * sk)1182 static inline void xfrm_sk_free_policy(struct sock *sk)
1183 {
1184 struct xfrm_policy *pol;
1185
1186 pol = rcu_dereference_protected(sk->sk_policy[0], 1);
1187 if (unlikely(pol != NULL)) {
1188 xfrm_policy_delete(pol, XFRM_POLICY_MAX);
1189 sk->sk_policy[0] = NULL;
1190 }
1191 pol = rcu_dereference_protected(sk->sk_policy[1], 1);
1192 if (unlikely(pol != NULL)) {
1193 xfrm_policy_delete(pol, XFRM_POLICY_MAX+1);
1194 sk->sk_policy[1] = NULL;
1195 }
1196 }
1197
1198 #else
1199
xfrm_sk_free_policy(struct sock * sk)1200 static inline void xfrm_sk_free_policy(struct sock *sk) {}
xfrm_sk_clone_policy(struct sock * sk,const struct sock * osk)1201 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) { return 0; }
xfrm6_route_forward(struct sk_buff * skb)1202 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
xfrm4_route_forward(struct sk_buff * skb)1203 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
xfrm6_policy_check(struct sock * sk,int dir,struct sk_buff * skb)1204 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1205 {
1206 return 1;
1207 }
xfrm4_policy_check(struct sock * sk,int dir,struct sk_buff * skb)1208 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1209 {
1210 return 1;
1211 }
xfrm_policy_check(struct sock * sk,int dir,struct sk_buff * skb,unsigned short family)1212 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1213 {
1214 return 1;
1215 }
xfrm_decode_session_reverse(struct sk_buff * skb,struct flowi * fl,unsigned int family)1216 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1217 struct flowi *fl,
1218 unsigned int family)
1219 {
1220 return -ENOSYS;
1221 }
xfrm4_policy_check_reverse(struct sock * sk,int dir,struct sk_buff * skb)1222 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1223 struct sk_buff *skb)
1224 {
1225 return 1;
1226 }
xfrm6_policy_check_reverse(struct sock * sk,int dir,struct sk_buff * skb)1227 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1228 struct sk_buff *skb)
1229 {
1230 return 1;
1231 }
1232 #endif
1233
1234 static __inline__
xfrm_flowi_daddr(const struct flowi * fl,unsigned short family)1235 xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family)
1236 {
1237 switch (family){
1238 case AF_INET:
1239 return (xfrm_address_t *)&fl->u.ip4.daddr;
1240 case AF_INET6:
1241 return (xfrm_address_t *)&fl->u.ip6.daddr;
1242 }
1243 return NULL;
1244 }
1245
1246 static __inline__
xfrm_flowi_saddr(const struct flowi * fl,unsigned short family)1247 xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family)
1248 {
1249 switch (family){
1250 case AF_INET:
1251 return (xfrm_address_t *)&fl->u.ip4.saddr;
1252 case AF_INET6:
1253 return (xfrm_address_t *)&fl->u.ip6.saddr;
1254 }
1255 return NULL;
1256 }
1257
1258 static __inline__
xfrm_flowi_addr_get(const struct flowi * fl,xfrm_address_t * saddr,xfrm_address_t * daddr,unsigned short family)1259 void xfrm_flowi_addr_get(const struct flowi *fl,
1260 xfrm_address_t *saddr, xfrm_address_t *daddr,
1261 unsigned short family)
1262 {
1263 switch(family) {
1264 case AF_INET:
1265 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4));
1266 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4));
1267 break;
1268 case AF_INET6:
1269 saddr->in6 = fl->u.ip6.saddr;
1270 daddr->in6 = fl->u.ip6.daddr;
1271 break;
1272 }
1273 }
1274
1275 static __inline__ int
__xfrm4_state_addr_check(const struct xfrm_state * x,const xfrm_address_t * daddr,const xfrm_address_t * saddr)1276 __xfrm4_state_addr_check(const struct xfrm_state *x,
1277 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1278 {
1279 if (daddr->a4 == x->id.daddr.a4 &&
1280 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1281 return 1;
1282 return 0;
1283 }
1284
1285 static __inline__ int
__xfrm6_state_addr_check(const struct xfrm_state * x,const xfrm_address_t * daddr,const xfrm_address_t * saddr)1286 __xfrm6_state_addr_check(const struct xfrm_state *x,
1287 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1288 {
1289 if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1290 (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) ||
1291 ipv6_addr_any((struct in6_addr *)saddr) ||
1292 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1293 return 1;
1294 return 0;
1295 }
1296
1297 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)1298 xfrm_state_addr_check(const struct xfrm_state *x,
1299 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1300 unsigned short family)
1301 {
1302 switch (family) {
1303 case AF_INET:
1304 return __xfrm4_state_addr_check(x, daddr, saddr);
1305 case AF_INET6:
1306 return __xfrm6_state_addr_check(x, daddr, saddr);
1307 }
1308 return 0;
1309 }
1310
1311 static __inline__ int
xfrm_state_addr_flow_check(const struct xfrm_state * x,const struct flowi * fl,unsigned short family)1312 xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl,
1313 unsigned short family)
1314 {
1315 switch (family) {
1316 case AF_INET:
1317 return __xfrm4_state_addr_check(x,
1318 (const xfrm_address_t *)&fl->u.ip4.daddr,
1319 (const xfrm_address_t *)&fl->u.ip4.saddr);
1320 case AF_INET6:
1321 return __xfrm6_state_addr_check(x,
1322 (const xfrm_address_t *)&fl->u.ip6.daddr,
1323 (const xfrm_address_t *)&fl->u.ip6.saddr);
1324 }
1325 return 0;
1326 }
1327
xfrm_state_kern(const struct xfrm_state * x)1328 static inline int xfrm_state_kern(const struct xfrm_state *x)
1329 {
1330 return atomic_read(&x->tunnel_users);
1331 }
1332
xfrm_id_proto_valid(u8 proto)1333 static inline bool xfrm_id_proto_valid(u8 proto)
1334 {
1335 switch (proto) {
1336 case IPPROTO_AH:
1337 case IPPROTO_ESP:
1338 case IPPROTO_COMP:
1339 #if IS_ENABLED(CONFIG_IPV6)
1340 case IPPROTO_ROUTING:
1341 case IPPROTO_DSTOPTS:
1342 #endif
1343 return true;
1344 default:
1345 return false;
1346 }
1347 }
1348
1349 /* IPSEC_PROTO_ANY only matches 3 IPsec protocols, 0 could match all. */
xfrm_id_proto_match(u8 proto,u8 userproto)1350 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1351 {
1352 return (!userproto || proto == userproto ||
1353 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1354 proto == IPPROTO_ESP ||
1355 proto == IPPROTO_COMP)));
1356 }
1357
1358 /*
1359 * xfrm algorithm information
1360 */
1361 struct xfrm_algo_aead_info {
1362 char *geniv;
1363 u16 icv_truncbits;
1364 };
1365
1366 struct xfrm_algo_auth_info {
1367 u16 icv_truncbits;
1368 u16 icv_fullbits;
1369 };
1370
1371 struct xfrm_algo_encr_info {
1372 char *geniv;
1373 u16 blockbits;
1374 u16 defkeybits;
1375 };
1376
1377 struct xfrm_algo_comp_info {
1378 u16 threshold;
1379 };
1380
1381 struct xfrm_algo_desc {
1382 char *name;
1383 char *compat;
1384 u8 available:1;
1385 u8 pfkey_supported:1;
1386 union {
1387 struct xfrm_algo_aead_info aead;
1388 struct xfrm_algo_auth_info auth;
1389 struct xfrm_algo_encr_info encr;
1390 struct xfrm_algo_comp_info comp;
1391 } uinfo;
1392 struct sadb_alg desc;
1393 };
1394
1395 /* XFRM protocol handlers. */
1396 struct xfrm4_protocol {
1397 int (*handler)(struct sk_buff *skb);
1398 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1399 int encap_type);
1400 int (*cb_handler)(struct sk_buff *skb, int err);
1401 int (*err_handler)(struct sk_buff *skb, u32 info);
1402
1403 struct xfrm4_protocol __rcu *next;
1404 int priority;
1405 };
1406
1407 struct xfrm6_protocol {
1408 int (*handler)(struct sk_buff *skb);
1409 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1410 int encap_type);
1411 int (*cb_handler)(struct sk_buff *skb, int err);
1412 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1413 u8 type, u8 code, int offset, __be32 info);
1414
1415 struct xfrm6_protocol __rcu *next;
1416 int priority;
1417 };
1418
1419 /* XFRM tunnel handlers. */
1420 struct xfrm_tunnel {
1421 int (*handler)(struct sk_buff *skb);
1422 int (*cb_handler)(struct sk_buff *skb, int err);
1423 int (*err_handler)(struct sk_buff *skb, u32 info);
1424
1425 struct xfrm_tunnel __rcu *next;
1426 int priority;
1427 };
1428
1429 struct xfrm6_tunnel {
1430 int (*handler)(struct sk_buff *skb);
1431 int (*cb_handler)(struct sk_buff *skb, int err);
1432 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1433 u8 type, u8 code, int offset, __be32 info);
1434 struct xfrm6_tunnel __rcu *next;
1435 int priority;
1436 };
1437
1438 void xfrm_init(void);
1439 void xfrm4_init(void);
1440 int xfrm_state_init(struct net *net);
1441 void xfrm_state_fini(struct net *net);
1442 void xfrm4_state_init(void);
1443 void xfrm4_protocol_init(void);
1444 #ifdef CONFIG_XFRM
1445 int xfrm6_init(void);
1446 void xfrm6_fini(void);
1447 int xfrm6_state_init(void);
1448 void xfrm6_state_fini(void);
1449 int xfrm6_protocol_init(void);
1450 void xfrm6_protocol_fini(void);
1451 #else
xfrm6_init(void)1452 static inline int xfrm6_init(void)
1453 {
1454 return 0;
1455 }
xfrm6_fini(void)1456 static inline void xfrm6_fini(void)
1457 {
1458 ;
1459 }
1460 #endif
1461
1462 #ifdef CONFIG_XFRM_STATISTICS
1463 int xfrm_proc_init(struct net *net);
1464 void xfrm_proc_fini(struct net *net);
1465 #endif
1466
1467 int xfrm_sysctl_init(struct net *net);
1468 #ifdef CONFIG_SYSCTL
1469 void xfrm_sysctl_fini(struct net *net);
1470 #else
xfrm_sysctl_fini(struct net * net)1471 static inline void xfrm_sysctl_fini(struct net *net)
1472 {
1473 }
1474 #endif
1475
1476 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
1477 struct xfrm_address_filter *filter);
1478 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1479 int (*func)(struct xfrm_state *, int, void*), void *);
1480 void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net);
1481 struct xfrm_state *xfrm_state_alloc(struct net *net);
1482 void xfrm_state_free(struct xfrm_state *x);
1483 struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr,
1484 const xfrm_address_t *saddr,
1485 const struct flowi *fl,
1486 struct xfrm_tmpl *tmpl,
1487 struct xfrm_policy *pol, int *err,
1488 unsigned short family, u32 if_id);
1489 struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark, u32 if_id,
1490 xfrm_address_t *daddr,
1491 xfrm_address_t *saddr,
1492 unsigned short family,
1493 u8 mode, u8 proto, u32 reqid);
1494 struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
1495 unsigned short family);
1496 int xfrm_state_check_expire(struct xfrm_state *x);
1497 void xfrm_state_insert(struct xfrm_state *x);
1498 int xfrm_state_add(struct xfrm_state *x);
1499 int xfrm_state_update(struct xfrm_state *x);
1500 struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1501 const xfrm_address_t *daddr, __be32 spi,
1502 u8 proto, unsigned short family);
1503 struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1504 const xfrm_address_t *daddr,
1505 const xfrm_address_t *saddr,
1506 u8 proto,
1507 unsigned short family);
1508 #ifdef CONFIG_XFRM_SUB_POLICY
1509 void xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1510 unsigned short family);
1511 void xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1512 unsigned short family);
1513 #else
xfrm_tmpl_sort(struct xfrm_tmpl ** d,struct xfrm_tmpl ** s,int n,unsigned short family)1514 static inline void xfrm_tmpl_sort(struct xfrm_tmpl **d, struct xfrm_tmpl **s,
1515 int n, unsigned short family)
1516 {
1517 }
1518
xfrm_state_sort(struct xfrm_state ** d,struct xfrm_state ** s,int n,unsigned short family)1519 static inline void xfrm_state_sort(struct xfrm_state **d, struct xfrm_state **s,
1520 int n, unsigned short family)
1521 {
1522 }
1523 #endif
1524
1525 struct xfrmk_sadinfo {
1526 u32 sadhcnt; /* current hash bkts */
1527 u32 sadhmcnt; /* max allowed hash bkts */
1528 u32 sadcnt; /* current running count */
1529 };
1530
1531 struct xfrmk_spdinfo {
1532 u32 incnt;
1533 u32 outcnt;
1534 u32 fwdcnt;
1535 u32 inscnt;
1536 u32 outscnt;
1537 u32 fwdscnt;
1538 u32 spdhcnt;
1539 u32 spdhmcnt;
1540 };
1541
1542 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1543 int xfrm_state_delete(struct xfrm_state *x);
1544 int xfrm_state_flush(struct net *net, u8 proto, bool task_valid, bool sync);
1545 int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid);
1546 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1547 void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1548 u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq);
1549 int xfrm_init_replay(struct xfrm_state *x);
1550 u32 xfrm_state_mtu(struct xfrm_state *x, int mtu);
1551 int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload);
1552 int xfrm_init_state(struct xfrm_state *x);
1553 int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type);
1554 int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1555 int xfrm_trans_queue_net(struct net *net, struct sk_buff *skb,
1556 int (*finish)(struct net *, struct sock *,
1557 struct sk_buff *));
1558 int xfrm_trans_queue(struct sk_buff *skb,
1559 int (*finish)(struct net *, struct sock *,
1560 struct sk_buff *));
1561 int xfrm_output_resume(struct sk_buff *skb, int err);
1562 int xfrm_output(struct sock *sk, struct sk_buff *skb);
1563
1564 int pktgen_xfrm_outer_mode_output(struct xfrm_state *x, struct sk_buff *skb);
1565
1566 void xfrm_local_error(struct sk_buff *skb, int mtu);
1567 int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1568 int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1569 int encap_type);
1570 int xfrm4_transport_finish(struct sk_buff *skb, int async);
1571 int xfrm4_rcv(struct sk_buff *skb);
1572 int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1573
xfrm4_rcv_spi(struct sk_buff * skb,int nexthdr,__be32 spi)1574 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1575 {
1576 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
1577 XFRM_SPI_SKB_CB(skb)->family = AF_INET;
1578 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
1579 return xfrm_input(skb, nexthdr, spi, 0);
1580 }
1581
1582 int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1583 int xfrm4_output_finish(struct sock *sk, struct sk_buff *skb);
1584 int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol);
1585 int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol);
1586 int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1587 int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1588 void xfrm4_local_error(struct sk_buff *skb, u32 mtu);
1589 int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1590 int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi,
1591 struct ip6_tnl *t);
1592 int xfrm6_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1593 int encap_type);
1594 int xfrm6_transport_finish(struct sk_buff *skb, int async);
1595 int xfrm6_rcv_tnl(struct sk_buff *skb, struct ip6_tnl *t);
1596 int xfrm6_rcv(struct sk_buff *skb);
1597 int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1598 xfrm_address_t *saddr, u8 proto);
1599 void xfrm6_local_error(struct sk_buff *skb, u32 mtu);
1600 int xfrm6_protocol_register(struct xfrm6_protocol *handler, unsigned char protocol);
1601 int xfrm6_protocol_deregister(struct xfrm6_protocol *handler, unsigned char protocol);
1602 int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1603 int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1604 __be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1605 __be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr);
1606 int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1607 int xfrm6_output_finish(struct sock *sk, struct sk_buff *skb);
1608 int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1609 u8 **prevhdr);
1610
1611 #ifdef CONFIG_XFRM
1612 void xfrm6_local_rxpmtu(struct sk_buff *skb, u32 mtu);
1613 int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1614 int xfrm6_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1615 int xfrm_user_policy(struct sock *sk, int optname, sockptr_t optval,
1616 int optlen);
1617 #else
xfrm_user_policy(struct sock * sk,int optname,sockptr_t optval,int optlen)1618 static inline int xfrm_user_policy(struct sock *sk, int optname,
1619 sockptr_t optval, int optlen)
1620 {
1621 return -ENOPROTOOPT;
1622 }
1623 #endif
1624
1625 struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, int oif,
1626 const xfrm_address_t *saddr,
1627 const xfrm_address_t *daddr,
1628 int family, u32 mark);
1629
1630 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1631
1632 void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1633 int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1634 int (*func)(struct xfrm_policy *, int, int, void*),
1635 void *);
1636 void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net);
1637 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1638 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net,
1639 const struct xfrm_mark *mark,
1640 u32 if_id, u8 type, int dir,
1641 struct xfrm_selector *sel,
1642 struct xfrm_sec_ctx *ctx, int delete,
1643 int *err);
1644 struct xfrm_policy *xfrm_policy_byid(struct net *net,
1645 const struct xfrm_mark *mark, u32 if_id,
1646 u8 type, int dir, u32 id, int delete,
1647 int *err);
1648 int xfrm_policy_flush(struct net *net, u8 type, bool task_valid);
1649 void xfrm_policy_hash_rebuild(struct net *net);
1650 u32 xfrm_get_acqseq(void);
1651 int verify_spi_info(u8 proto, u32 min, u32 max);
1652 int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1653 struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark,
1654 u8 mode, u32 reqid, u32 if_id, u8 proto,
1655 const xfrm_address_t *daddr,
1656 const xfrm_address_t *saddr, int create,
1657 unsigned short family);
1658 int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1659
1660 #ifdef CONFIG_XFRM_MIGRATE
1661 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1662 const struct xfrm_migrate *m, int num_bundles,
1663 const struct xfrm_kmaddress *k,
1664 const struct xfrm_encap_tmpl *encap);
1665 struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net,
1666 u32 if_id);
1667 struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1668 struct xfrm_migrate *m,
1669 struct xfrm_encap_tmpl *encap);
1670 int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1671 struct xfrm_migrate *m, int num_bundles,
1672 struct xfrm_kmaddress *k, struct net *net,
1673 struct xfrm_encap_tmpl *encap, u32 if_id);
1674 #endif
1675
1676 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1677 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid);
1678 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel,
1679 xfrm_address_t *addr);
1680
1681 void xfrm_input_init(void);
1682 int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1683
1684 void xfrm_probe_algs(void);
1685 int xfrm_count_pfkey_auth_supported(void);
1686 int xfrm_count_pfkey_enc_supported(void);
1687 struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1688 struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1689 struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1690 struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1691 struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1692 struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe);
1693 struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe);
1694 struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe);
1695 struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len,
1696 int probe);
1697
xfrm6_addr_equal(const xfrm_address_t * a,const xfrm_address_t * b)1698 static inline bool xfrm6_addr_equal(const xfrm_address_t *a,
1699 const xfrm_address_t *b)
1700 {
1701 return ipv6_addr_equal((const struct in6_addr *)a,
1702 (const struct in6_addr *)b);
1703 }
1704
xfrm_addr_equal(const xfrm_address_t * a,const xfrm_address_t * b,sa_family_t family)1705 static inline bool xfrm_addr_equal(const xfrm_address_t *a,
1706 const xfrm_address_t *b,
1707 sa_family_t family)
1708 {
1709 switch (family) {
1710 default:
1711 case AF_INET:
1712 return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0;
1713 case AF_INET6:
1714 return xfrm6_addr_equal(a, b);
1715 }
1716 }
1717
xfrm_policy_id2dir(u32 index)1718 static inline int xfrm_policy_id2dir(u32 index)
1719 {
1720 return index & 7;
1721 }
1722
1723 #ifdef CONFIG_XFRM
xfrm_aevent_is_on(struct net * net)1724 static inline int xfrm_aevent_is_on(struct net *net)
1725 {
1726 struct sock *nlsk;
1727 int ret = 0;
1728
1729 rcu_read_lock();
1730 nlsk = rcu_dereference(net->xfrm.nlsk);
1731 if (nlsk)
1732 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1733 rcu_read_unlock();
1734 return ret;
1735 }
1736
xfrm_acquire_is_on(struct net * net)1737 static inline int xfrm_acquire_is_on(struct net *net)
1738 {
1739 struct sock *nlsk;
1740 int ret = 0;
1741
1742 rcu_read_lock();
1743 nlsk = rcu_dereference(net->xfrm.nlsk);
1744 if (nlsk)
1745 ret = netlink_has_listeners(nlsk, XFRMNLGRP_ACQUIRE);
1746 rcu_read_unlock();
1747
1748 return ret;
1749 }
1750 #endif
1751
aead_len(struct xfrm_algo_aead * alg)1752 static inline unsigned int aead_len(struct xfrm_algo_aead *alg)
1753 {
1754 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1755 }
1756
xfrm_alg_len(const struct xfrm_algo * alg)1757 static inline unsigned int xfrm_alg_len(const struct xfrm_algo *alg)
1758 {
1759 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1760 }
1761
xfrm_alg_auth_len(const struct xfrm_algo_auth * alg)1762 static inline unsigned int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg)
1763 {
1764 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1765 }
1766
xfrm_replay_state_esn_len(struct xfrm_replay_state_esn * replay_esn)1767 static inline unsigned int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn)
1768 {
1769 return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32);
1770 }
1771
1772 #ifdef CONFIG_XFRM_MIGRATE
xfrm_replay_clone(struct xfrm_state * x,struct xfrm_state * orig)1773 static inline int xfrm_replay_clone(struct xfrm_state *x,
1774 struct xfrm_state *orig)
1775 {
1776
1777 x->replay_esn = kmemdup(orig->replay_esn,
1778 xfrm_replay_state_esn_len(orig->replay_esn),
1779 GFP_KERNEL);
1780 if (!x->replay_esn)
1781 return -ENOMEM;
1782 x->preplay_esn = kmemdup(orig->preplay_esn,
1783 xfrm_replay_state_esn_len(orig->preplay_esn),
1784 GFP_KERNEL);
1785 if (!x->preplay_esn)
1786 return -ENOMEM;
1787
1788 return 0;
1789 }
1790
xfrm_algo_aead_clone(struct xfrm_algo_aead * orig)1791 static inline struct xfrm_algo_aead *xfrm_algo_aead_clone(struct xfrm_algo_aead *orig)
1792 {
1793 return kmemdup(orig, aead_len(orig), GFP_KERNEL);
1794 }
1795
1796
xfrm_algo_clone(struct xfrm_algo * orig)1797 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1798 {
1799 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1800 }
1801
xfrm_algo_auth_clone(struct xfrm_algo_auth * orig)1802 static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1803 {
1804 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1805 }
1806
xfrm_states_put(struct xfrm_state ** states,int n)1807 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1808 {
1809 int i;
1810 for (i = 0; i < n; i++)
1811 xfrm_state_put(*(states + i));
1812 }
1813
xfrm_states_delete(struct xfrm_state ** states,int n)1814 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1815 {
1816 int i;
1817 for (i = 0; i < n; i++)
1818 xfrm_state_delete(*(states + i));
1819 }
1820 #endif
1821
1822 #ifdef CONFIG_XFRM
xfrm_input_state(struct sk_buff * skb)1823 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1824 {
1825 struct sec_path *sp = skb_sec_path(skb);
1826
1827 return sp->xvec[sp->len - 1];
1828 }
1829 #endif
1830
xfrm_offload(struct sk_buff * skb)1831 static inline struct xfrm_offload *xfrm_offload(struct sk_buff *skb)
1832 {
1833 #ifdef CONFIG_XFRM
1834 struct sec_path *sp = skb_sec_path(skb);
1835
1836 if (!sp || !sp->olen || sp->len != sp->olen)
1837 return NULL;
1838
1839 return &sp->ovec[sp->olen - 1];
1840 #else
1841 return NULL;
1842 #endif
1843 }
1844
1845 void __init xfrm_dev_init(void);
1846
1847 #ifdef CONFIG_XFRM_OFFLOAD
1848 void xfrm_dev_resume(struct sk_buff *skb);
1849 void xfrm_dev_backlog(struct softnet_data *sd);
1850 struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again);
1851 int xfrm_dev_state_add(struct net *net, struct xfrm_state *x,
1852 struct xfrm_user_offload *xuo);
1853 bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x);
1854
xfrm_dev_state_advance_esn(struct xfrm_state * x)1855 static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
1856 {
1857 struct xfrm_state_offload *xso = &x->xso;
1858
1859 if (xso->dev && xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn)
1860 xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn(x);
1861 }
1862
xfrm_dst_offload_ok(struct dst_entry * dst)1863 static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
1864 {
1865 struct xfrm_state *x = dst->xfrm;
1866 struct xfrm_dst *xdst;
1867
1868 if (!x || !x->type_offload)
1869 return false;
1870
1871 xdst = (struct xfrm_dst *) dst;
1872 if (!x->xso.offload_handle && !xdst->child->xfrm)
1873 return true;
1874 if (x->xso.offload_handle && (x->xso.dev == xfrm_dst_path(dst)->dev) &&
1875 !xdst->child->xfrm)
1876 return true;
1877
1878 return false;
1879 }
1880
xfrm_dev_state_delete(struct xfrm_state * x)1881 static inline void xfrm_dev_state_delete(struct xfrm_state *x)
1882 {
1883 struct xfrm_state_offload *xso = &x->xso;
1884
1885 if (xso->dev)
1886 xso->dev->xfrmdev_ops->xdo_dev_state_delete(x);
1887 }
1888
xfrm_dev_state_free(struct xfrm_state * x)1889 static inline void xfrm_dev_state_free(struct xfrm_state *x)
1890 {
1891 struct xfrm_state_offload *xso = &x->xso;
1892 struct net_device *dev = xso->dev;
1893
1894 if (dev && dev->xfrmdev_ops) {
1895 if (dev->xfrmdev_ops->xdo_dev_state_free)
1896 dev->xfrmdev_ops->xdo_dev_state_free(x);
1897 xso->dev = NULL;
1898 dev_put(dev);
1899 }
1900 }
1901 #else
xfrm_dev_resume(struct sk_buff * skb)1902 static inline void xfrm_dev_resume(struct sk_buff *skb)
1903 {
1904 }
1905
xfrm_dev_backlog(struct softnet_data * sd)1906 static inline void xfrm_dev_backlog(struct softnet_data *sd)
1907 {
1908 }
1909
validate_xmit_xfrm(struct sk_buff * skb,netdev_features_t features,bool * again)1910 static inline struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again)
1911 {
1912 return skb;
1913 }
1914
xfrm_dev_state_add(struct net * net,struct xfrm_state * x,struct xfrm_user_offload * xuo)1915 static inline int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, struct xfrm_user_offload *xuo)
1916 {
1917 return 0;
1918 }
1919
xfrm_dev_state_delete(struct xfrm_state * x)1920 static inline void xfrm_dev_state_delete(struct xfrm_state *x)
1921 {
1922 }
1923
xfrm_dev_state_free(struct xfrm_state * x)1924 static inline void xfrm_dev_state_free(struct xfrm_state *x)
1925 {
1926 }
1927
xfrm_dev_offload_ok(struct sk_buff * skb,struct xfrm_state * x)1928 static inline bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x)
1929 {
1930 return false;
1931 }
1932
xfrm_dev_state_advance_esn(struct xfrm_state * x)1933 static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
1934 {
1935 }
1936
xfrm_dst_offload_ok(struct dst_entry * dst)1937 static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
1938 {
1939 return false;
1940 }
1941 #endif
1942
xfrm_mark_get(struct nlattr ** attrs,struct xfrm_mark * m)1943 static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
1944 {
1945 if (attrs[XFRMA_MARK])
1946 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark));
1947 else
1948 m->v = m->m = 0;
1949
1950 return m->v & m->m;
1951 }
1952
xfrm_mark_put(struct sk_buff * skb,const struct xfrm_mark * m)1953 static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m)
1954 {
1955 int ret = 0;
1956
1957 if (m->m | m->v)
1958 ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
1959 return ret;
1960 }
1961
xfrm_smark_get(__u32 mark,struct xfrm_state * x)1962 static inline __u32 xfrm_smark_get(__u32 mark, struct xfrm_state *x)
1963 {
1964 struct xfrm_mark *m = &x->props.smark;
1965
1966 return (m->v & m->m) | (mark & ~m->m);
1967 }
1968
xfrm_if_id_put(struct sk_buff * skb,__u32 if_id)1969 static inline int xfrm_if_id_put(struct sk_buff *skb, __u32 if_id)
1970 {
1971 int ret = 0;
1972
1973 if (if_id)
1974 ret = nla_put_u32(skb, XFRMA_IF_ID, if_id);
1975 return ret;
1976 }
1977
xfrm_tunnel_check(struct sk_buff * skb,struct xfrm_state * x,unsigned int family)1978 static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x,
1979 unsigned int family)
1980 {
1981 bool tunnel = false;
1982
1983 switch(family) {
1984 case AF_INET:
1985 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4)
1986 tunnel = true;
1987 break;
1988 case AF_INET6:
1989 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6)
1990 tunnel = true;
1991 break;
1992 }
1993 if (tunnel && !(x->outer_mode.flags & XFRM_MODE_FLAG_TUNNEL))
1994 return -EINVAL;
1995
1996 return 0;
1997 }
1998
1999 extern const int xfrm_msg_min[XFRM_NR_MSGTYPES];
2000 extern const struct nla_policy xfrma_policy[XFRMA_MAX+1];
2001
2002 struct xfrm_translator {
2003 /* Allocate frag_list and put compat translation there */
2004 int (*alloc_compat)(struct sk_buff *skb, const struct nlmsghdr *src);
2005
2006 /* Allocate nlmsg with 64-bit translaton of received 32-bit message */
2007 struct nlmsghdr *(*rcv_msg_compat)(const struct nlmsghdr *nlh,
2008 int maxtype, const struct nla_policy *policy,
2009 struct netlink_ext_ack *extack);
2010
2011 /* Translate 32-bit user_policy from sockptr */
2012 int (*xlate_user_policy_sockptr)(u8 **pdata32, int optlen);
2013
2014 struct module *owner;
2015 };
2016
2017 #if IS_ENABLED(CONFIG_XFRM_USER_COMPAT)
2018 extern int xfrm_register_translator(struct xfrm_translator *xtr);
2019 extern int xfrm_unregister_translator(struct xfrm_translator *xtr);
2020 extern struct xfrm_translator *xfrm_get_translator(void);
2021 extern void xfrm_put_translator(struct xfrm_translator *xtr);
2022 #else
xfrm_get_translator(void)2023 static inline struct xfrm_translator *xfrm_get_translator(void)
2024 {
2025 return NULL;
2026 }
xfrm_put_translator(struct xfrm_translator * xtr)2027 static inline void xfrm_put_translator(struct xfrm_translator *xtr)
2028 {
2029 }
2030 #endif
2031
2032 #if IS_ENABLED(CONFIG_IPV6)
xfrm6_local_dontfrag(const struct sock * sk)2033 static inline bool xfrm6_local_dontfrag(const struct sock *sk)
2034 {
2035 int proto;
2036
2037 if (!sk || sk->sk_family != AF_INET6)
2038 return false;
2039
2040 proto = sk->sk_protocol;
2041 if (proto == IPPROTO_UDP || proto == IPPROTO_RAW)
2042 return inet6_sk(sk)->dontfrag;
2043
2044 return false;
2045 }
2046 #endif
2047 #endif /* _NET_XFRM_H */
2048