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
19 #include <net/sock.h>
20 #include <net/dst.h>
21 #include <net/ip.h>
22 #include <net/route.h>
23 #include <net/ipv6.h>
24 #include <net/ip6_fib.h>
25 #include <net/flow.h>
26 #include <net/gro_cells.h>
27
28 #include <linux/interrupt.h>
29
30 #ifdef CONFIG_XFRM_STATISTICS
31 #include <net/snmp.h>
32 #endif
33
34 #define XFRM_PROTO_ESP 50
35 #define XFRM_PROTO_AH 51
36 #define XFRM_PROTO_COMP 108
37 #define XFRM_PROTO_IPIP 4
38 #define XFRM_PROTO_IPV6 41
39 #define XFRM_PROTO_ROUTING IPPROTO_ROUTING
40 #define XFRM_PROTO_DSTOPTS IPPROTO_DSTOPTS
41
42 #define XFRM_ALIGN4(len) (((len) + 3) & ~3)
43 #define XFRM_ALIGN8(len) (((len) + 7) & ~7)
44 #define MODULE_ALIAS_XFRM_MODE(family, encap) \
45 MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap))
46 #define MODULE_ALIAS_XFRM_TYPE(family, proto) \
47 MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto))
48 #define MODULE_ALIAS_XFRM_OFFLOAD_TYPE(family, proto) \
49 MODULE_ALIAS("xfrm-offload-" __stringify(family) "-" __stringify(proto))
50
51 #ifdef CONFIG_XFRM_STATISTICS
52 #define XFRM_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.xfrm_statistics, field)
53 #else
54 #define XFRM_INC_STATS(net, field) ((void)(net))
55 #endif
56
57
58 /* Organization of SPD aka "XFRM rules"
59 ------------------------------------
60
61 Basic objects:
62 - policy rule, struct xfrm_policy (=SPD entry)
63 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
64 - instance of a transformer, struct xfrm_state (=SA)
65 - template to clone xfrm_state, struct xfrm_tmpl
66
67 SPD is plain linear list of xfrm_policy rules, ordered by priority.
68 (To be compatible with existing pfkeyv2 implementations,
69 many rules with priority of 0x7fffffff are allowed to exist and
70 such rules are ordered in an unpredictable way, thanks to bsd folks.)
71
72 Lookup is plain linear search until the first match with selector.
73
74 If "action" is "block", then we prohibit the flow, otherwise:
75 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
76 policy entry has list of up to XFRM_MAX_DEPTH transformations,
77 described by templates xfrm_tmpl. Each template is resolved
78 to a complete xfrm_state (see below) and we pack bundle of transformations
79 to a dst_entry returned to requestor.
80
81 dst -. xfrm .-> xfrm_state #1
82 |---. child .-> dst -. xfrm .-> xfrm_state #2
83 |---. child .-> dst -. xfrm .-> xfrm_state #3
84 |---. child .-> NULL
85
86 Bundles are cached at xrfm_policy struct (field ->bundles).
87
88
89 Resolution of xrfm_tmpl
90 -----------------------
91 Template contains:
92 1. ->mode Mode: transport or tunnel
93 2. ->id.proto Protocol: AH/ESP/IPCOMP
94 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode.
95 Q: allow to resolve security gateway?
96 4. ->id.spi If not zero, static SPI.
97 5. ->saddr Local tunnel endpoint, ignored for transport mode.
98 6. ->algos List of allowed algos. Plain bitmask now.
99 Q: ealgos, aalgos, calgos. What a mess...
100 7. ->share Sharing mode.
101 Q: how to implement private sharing mode? To add struct sock* to
102 flow id?
103
104 Having this template we search through SAD searching for entries
105 with appropriate mode/proto/algo, permitted by selector.
106 If no appropriate entry found, it is requested from key manager.
107
108 PROBLEMS:
109 Q: How to find all the bundles referring to a physical path for
110 PMTU discovery? Seems, dst should contain list of all parents...
111 and enter to infinite locking hierarchy disaster.
112 No! It is easier, we will not search for them, let them find us.
113 We add genid to each dst plus pointer to genid of raw IP route,
114 pmtu disc will update pmtu on raw IP route and increase its genid.
115 dst_check() will see this for top level and trigger resyncing
116 metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
117 */
118
119 struct xfrm_state_walk {
120 struct list_head all;
121 u8 state;
122 u8 dying;
123 u8 proto;
124 u32 seq;
125 struct xfrm_address_filter *filter;
126 };
127
128 struct xfrm_state_offload {
129 struct net_device *dev;
130 unsigned long offload_handle;
131 unsigned int num_exthdrs;
132 u8 flags;
133 };
134
135 struct xfrm_mode {
136 u8 encap;
137 u8 family;
138 u8 flags;
139 };
140
141 /* Flags for xfrm_mode. */
142 enum {
143 XFRM_MODE_FLAG_TUNNEL = 1,
144 };
145
146 /* Full description of state of transformer. */
147 struct xfrm_state {
148 possible_net_t xs_net;
149 union {
150 struct hlist_node gclist;
151 struct hlist_node bydst;
152 };
153 struct hlist_node bysrc;
154 struct hlist_node byspi;
155
156 refcount_t refcnt;
157 spinlock_t lock;
158
159 struct xfrm_id id;
160 struct xfrm_selector sel;
161 struct xfrm_mark mark;
162 u32 if_id;
163 u32 tfcpad;
164
165 u32 genid;
166
167 /* Key manager bits */
168 struct xfrm_state_walk km;
169
170 /* Parameters of this state. */
171 struct {
172 u32 reqid;
173 u8 mode;
174 u8 replay_window;
175 u8 aalgo, ealgo, calgo;
176 u8 flags;
177 u16 family;
178 xfrm_address_t saddr;
179 int header_len;
180 int trailer_len;
181 u32 extra_flags;
182 struct xfrm_mark smark;
183 } props;
184
185 struct xfrm_lifetime_cfg lft;
186
187 /* Data for transformer */
188 struct xfrm_algo_auth *aalg;
189 struct xfrm_algo *ealg;
190 struct xfrm_algo *calg;
191 struct xfrm_algo_aead *aead;
192 const char *geniv;
193
194 /* Data for encapsulator */
195 struct xfrm_encap_tmpl *encap;
196
197 /* Data for care-of address */
198 xfrm_address_t *coaddr;
199
200 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
201 struct xfrm_state *tunnel;
202
203 /* If a tunnel, number of users + 1 */
204 atomic_t tunnel_users;
205
206 /* State for replay detection */
207 struct xfrm_replay_state replay;
208 struct xfrm_replay_state_esn *replay_esn;
209
210 /* Replay detection state at the time we sent the last notification */
211 struct xfrm_replay_state preplay;
212 struct xfrm_replay_state_esn *preplay_esn;
213
214 /* The functions for replay detection. */
215 const struct xfrm_replay *repl;
216
217 /* internal flag that only holds state for delayed aevent at the
218 * moment
219 */
220 u32 xflags;
221
222 /* Replay detection notification settings */
223 u32 replay_maxage;
224 u32 replay_maxdiff;
225
226 /* Replay detection notification timer */
227 struct timer_list rtimer;
228
229 /* Statistics */
230 struct xfrm_stats stats;
231
232 struct xfrm_lifetime_cur curlft;
233 struct hrtimer mtimer;
234
235 struct xfrm_state_offload xso;
236
237 /* used to fix curlft->add_time when changing date */
238 long saved_tmo;
239
240 /* Last used time */
241 time64_t lastused;
242
243 struct page_frag xfrag;
244
245 /* Reference to data common to all the instances of this
246 * transformer. */
247 const struct xfrm_type *type;
248 struct xfrm_mode inner_mode;
249 struct xfrm_mode inner_mode_iaf;
250 struct xfrm_mode outer_mode;
251
252 const struct xfrm_type_offload *type_offload;
253
254 /* Security context */
255 struct xfrm_sec_ctx *security;
256
257 /* Private data of this transformer, format is opaque,
258 * interpreted by xfrm_type methods. */
259 void *data;
260 };
261
xs_net(struct xfrm_state * x)262 static inline struct net *xs_net(struct xfrm_state *x)
263 {
264 return read_pnet(&x->xs_net);
265 }
266
267 /* xflags - make enum if more show up */
268 #define XFRM_TIME_DEFER 1
269 #define XFRM_SOFT_EXPIRE 2
270
271 enum {
272 XFRM_STATE_VOID,
273 XFRM_STATE_ACQ,
274 XFRM_STATE_VALID,
275 XFRM_STATE_ERROR,
276 XFRM_STATE_EXPIRED,
277 XFRM_STATE_DEAD
278 };
279
280 /* callback structure passed from either netlink or pfkey */
281 struct km_event {
282 union {
283 u32 hard;
284 u32 proto;
285 u32 byid;
286 u32 aevent;
287 u32 type;
288 } data;
289
290 u32 seq;
291 u32 portid;
292 u32 event;
293 struct net *net;
294 };
295
296 struct xfrm_replay {
297 void (*advance)(struct xfrm_state *x, __be32 net_seq);
298 int (*check)(struct xfrm_state *x,
299 struct sk_buff *skb,
300 __be32 net_seq);
301 int (*recheck)(struct xfrm_state *x,
302 struct sk_buff *skb,
303 __be32 net_seq);
304 void (*notify)(struct xfrm_state *x, int event);
305 int (*overflow)(struct xfrm_state *x, struct sk_buff *skb);
306 };
307
308 struct xfrm_if_cb {
309 struct xfrm_if *(*decode_session)(struct sk_buff *skb,
310 unsigned short family);
311 };
312
313 void xfrm_if_register_cb(const struct xfrm_if_cb *ifcb);
314 void xfrm_if_unregister_cb(void);
315
316 struct net_device;
317 struct xfrm_type;
318 struct xfrm_dst;
319 struct xfrm_policy_afinfo {
320 struct dst_ops *dst_ops;
321 struct dst_entry *(*dst_lookup)(struct net *net,
322 int tos, int oif,
323 const xfrm_address_t *saddr,
324 const xfrm_address_t *daddr,
325 u32 mark);
326 int (*get_saddr)(struct net *net, int oif,
327 xfrm_address_t *saddr,
328 xfrm_address_t *daddr,
329 u32 mark);
330 int (*fill_dst)(struct xfrm_dst *xdst,
331 struct net_device *dev,
332 const struct flowi *fl);
333 struct dst_entry *(*blackhole_route)(struct net *net, struct dst_entry *orig);
334 };
335
336 int xfrm_policy_register_afinfo(const struct xfrm_policy_afinfo *afinfo, int family);
337 void xfrm_policy_unregister_afinfo(const struct xfrm_policy_afinfo *afinfo);
338 void km_policy_notify(struct xfrm_policy *xp, int dir,
339 const struct km_event *c);
340 void km_state_notify(struct xfrm_state *x, const struct km_event *c);
341
342 struct xfrm_tmpl;
343 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t,
344 struct xfrm_policy *pol);
345 void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
346 int __xfrm_state_delete(struct xfrm_state *x);
347
348 struct xfrm_state_afinfo {
349 u8 family;
350 u8 proto;
351
352 const struct xfrm_type_offload *type_offload_esp;
353
354 const struct xfrm_type *type_esp;
355 const struct xfrm_type *type_ipip;
356 const struct xfrm_type *type_ipip6;
357 const struct xfrm_type *type_comp;
358 const struct xfrm_type *type_ah;
359 const struct xfrm_type *type_routing;
360 const struct xfrm_type *type_dstopts;
361
362 int (*output)(struct net *net, struct sock *sk, struct sk_buff *skb);
363 int (*output_finish)(struct sock *sk, struct sk_buff *skb);
364 int (*extract_input)(struct xfrm_state *x,
365 struct sk_buff *skb);
366 int (*extract_output)(struct xfrm_state *x,
367 struct sk_buff *skb);
368 int (*transport_finish)(struct sk_buff *skb,
369 int async);
370 void (*local_error)(struct sk_buff *skb, u32 mtu);
371 };
372
373 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
374 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
375 struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family);
376 struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family);
377
378 struct xfrm_input_afinfo {
379 unsigned int family;
380 int (*callback)(struct sk_buff *skb, u8 protocol,
381 int err);
382 };
383
384 int xfrm_input_register_afinfo(const struct xfrm_input_afinfo *afinfo);
385 int xfrm_input_unregister_afinfo(const struct xfrm_input_afinfo *afinfo);
386
387 void xfrm_flush_gc(void);
388 void xfrm_state_delete_tunnel(struct xfrm_state *x);
389
390 struct xfrm_type {
391 char *description;
392 struct module *owner;
393 u8 proto;
394 u8 flags;
395 #define XFRM_TYPE_NON_FRAGMENT 1
396 #define XFRM_TYPE_REPLAY_PROT 2
397 #define XFRM_TYPE_LOCAL_COADDR 4
398 #define XFRM_TYPE_REMOTE_COADDR 8
399
400 int (*init_state)(struct xfrm_state *x);
401 void (*destructor)(struct xfrm_state *);
402 int (*input)(struct xfrm_state *, struct sk_buff *skb);
403 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
404 int (*reject)(struct xfrm_state *, struct sk_buff *,
405 const struct flowi *);
406 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
407 };
408
409 int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
410 void xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
411
412 struct xfrm_type_offload {
413 char *description;
414 struct module *owner;
415 u8 proto;
416 void (*encap)(struct xfrm_state *, struct sk_buff *pskb);
417 int (*input_tail)(struct xfrm_state *x, struct sk_buff *skb);
418 int (*xmit)(struct xfrm_state *, struct sk_buff *pskb, netdev_features_t features);
419 };
420
421 int xfrm_register_type_offload(const struct xfrm_type_offload *type, unsigned short family);
422 void xfrm_unregister_type_offload(const struct xfrm_type_offload *type, unsigned short family);
423
xfrm_af2proto(unsigned int family)424 static inline int xfrm_af2proto(unsigned int family)
425 {
426 switch(family) {
427 case AF_INET:
428 return IPPROTO_IPIP;
429 case AF_INET6:
430 return IPPROTO_IPV6;
431 default:
432 return 0;
433 }
434 }
435
xfrm_ip2inner_mode(struct xfrm_state * x,int ipproto)436 static inline const struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
437 {
438 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
439 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
440 return &x->inner_mode;
441 else
442 return &x->inner_mode_iaf;
443 }
444
445 struct xfrm_tmpl {
446 /* id in template is interpreted as:
447 * daddr - destination of tunnel, may be zero for transport mode.
448 * spi - zero to acquire spi. Not zero if spi is static, then
449 * daddr must be fixed too.
450 * proto - AH/ESP/IPCOMP
451 */
452 struct xfrm_id id;
453
454 /* Source address of tunnel. Ignored, if it is not a tunnel. */
455 xfrm_address_t saddr;
456
457 unsigned short encap_family;
458
459 u32 reqid;
460
461 /* Mode: transport, tunnel etc. */
462 u8 mode;
463
464 /* Sharing mode: unique, this session only, this user only etc. */
465 u8 share;
466
467 /* May skip this transfomration if no SA is found */
468 u8 optional;
469
470 /* Skip aalgos/ealgos/calgos checks. */
471 u8 allalgs;
472
473 /* Bit mask of algos allowed for acquisition */
474 u32 aalgos;
475 u32 ealgos;
476 u32 calgos;
477 };
478
479 #define XFRM_MAX_DEPTH 6
480 #define XFRM_MAX_OFFLOAD_DEPTH 1
481
482 struct xfrm_policy_walk_entry {
483 struct list_head all;
484 u8 dead;
485 };
486
487 struct xfrm_policy_walk {
488 struct xfrm_policy_walk_entry walk;
489 u8 type;
490 u32 seq;
491 };
492
493 struct xfrm_policy_queue {
494 struct sk_buff_head hold_queue;
495 struct timer_list hold_timer;
496 unsigned long timeout;
497 };
498
499 struct xfrm_policy {
500 possible_net_t xp_net;
501 struct hlist_node bydst;
502 struct hlist_node byidx;
503
504 /* This lock only affects elements except for entry. */
505 rwlock_t lock;
506 refcount_t refcnt;
507 u32 pos;
508 struct timer_list timer;
509
510 atomic_t genid;
511 u32 priority;
512 u32 index;
513 u32 if_id;
514 struct xfrm_mark mark;
515 struct xfrm_selector selector;
516 struct xfrm_lifetime_cfg lft;
517 struct xfrm_lifetime_cur curlft;
518 struct xfrm_policy_walk_entry walk;
519 struct xfrm_policy_queue polq;
520 bool bydst_reinsert;
521 u8 type;
522 u8 action;
523 u8 flags;
524 u8 xfrm_nr;
525 u16 family;
526 struct xfrm_sec_ctx *security;
527 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
528 struct hlist_node bydst_inexact_list;
529 struct rcu_head rcu;
530 };
531
xp_net(const struct xfrm_policy * xp)532 static inline struct net *xp_net(const struct xfrm_policy *xp)
533 {
534 return read_pnet(&xp->xp_net);
535 }
536
537 struct xfrm_kmaddress {
538 xfrm_address_t local;
539 xfrm_address_t remote;
540 u32 reserved;
541 u16 family;
542 };
543
544 struct xfrm_migrate {
545 xfrm_address_t old_daddr;
546 xfrm_address_t old_saddr;
547 xfrm_address_t new_daddr;
548 xfrm_address_t new_saddr;
549 u8 proto;
550 u8 mode;
551 u16 reserved;
552 u32 reqid;
553 u16 old_family;
554 u16 new_family;
555 };
556
557 #define XFRM_KM_TIMEOUT 30
558 /* what happened */
559 #define XFRM_REPLAY_UPDATE XFRM_AE_CR
560 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
561
562 /* default aevent timeout in units of 100ms */
563 #define XFRM_AE_ETIME 10
564 /* Async Event timer multiplier */
565 #define XFRM_AE_ETH_M 10
566 /* default seq threshold size */
567 #define XFRM_AE_SEQT_SIZE 2
568
569 struct xfrm_mgr {
570 struct list_head list;
571 int (*notify)(struct xfrm_state *x, const struct km_event *c);
572 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp);
573 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
574 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
575 int (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c);
576 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
577 int (*migrate)(const struct xfrm_selector *sel,
578 u8 dir, u8 type,
579 const struct xfrm_migrate *m,
580 int num_bundles,
581 const struct xfrm_kmaddress *k,
582 const struct xfrm_encap_tmpl *encap);
583 bool (*is_alive)(const struct km_event *c);
584 };
585
586 int xfrm_register_km(struct xfrm_mgr *km);
587 int xfrm_unregister_km(struct xfrm_mgr *km);
588
589 struct xfrm_tunnel_skb_cb {
590 union {
591 struct inet_skb_parm h4;
592 struct inet6_skb_parm h6;
593 } header;
594
595 union {
596 struct ip_tunnel *ip4;
597 struct ip6_tnl *ip6;
598 } tunnel;
599 };
600
601 #define XFRM_TUNNEL_SKB_CB(__skb) ((struct xfrm_tunnel_skb_cb *)&((__skb)->cb[0]))
602
603 /*
604 * This structure is used for the duration where packets are being
605 * transformed by IPsec. As soon as the packet leaves IPsec the
606 * area beyond the generic IP part may be overwritten.
607 */
608 struct xfrm_skb_cb {
609 struct xfrm_tunnel_skb_cb header;
610
611 /* Sequence number for replay protection. */
612 union {
613 struct {
614 __u32 low;
615 __u32 hi;
616 } output;
617 struct {
618 __be32 low;
619 __be32 hi;
620 } input;
621 } seq;
622 };
623
624 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
625
626 /*
627 * This structure is used by the afinfo prepare_input/prepare_output functions
628 * to transmit header information to the mode input/output functions.
629 */
630 struct xfrm_mode_skb_cb {
631 struct xfrm_tunnel_skb_cb header;
632
633 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
634 __be16 id;
635 __be16 frag_off;
636
637 /* IP header length (excluding options or extension headers). */
638 u8 ihl;
639
640 /* TOS for IPv4, class for IPv6. */
641 u8 tos;
642
643 /* TTL for IPv4, hop limitfor IPv6. */
644 u8 ttl;
645
646 /* Protocol for IPv4, NH for IPv6. */
647 u8 protocol;
648
649 /* Option length for IPv4, zero for IPv6. */
650 u8 optlen;
651
652 /* Used by IPv6 only, zero for IPv4. */
653 u8 flow_lbl[3];
654 };
655
656 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
657
658 /*
659 * This structure is used by the input processing to locate the SPI and
660 * related information.
661 */
662 struct xfrm_spi_skb_cb {
663 struct xfrm_tunnel_skb_cb header;
664
665 unsigned int daddroff;
666 unsigned int family;
667 __be32 seq;
668 };
669
670 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
671
672 #ifdef CONFIG_AUDITSYSCALL
xfrm_audit_start(const char * op)673 static inline struct audit_buffer *xfrm_audit_start(const char *op)
674 {
675 struct audit_buffer *audit_buf = NULL;
676
677 if (audit_enabled == AUDIT_OFF)
678 return NULL;
679 audit_buf = audit_log_start(audit_context(), GFP_ATOMIC,
680 AUDIT_MAC_IPSEC_EVENT);
681 if (audit_buf == NULL)
682 return NULL;
683 audit_log_format(audit_buf, "op=%s", op);
684 return audit_buf;
685 }
686
xfrm_audit_helper_usrinfo(bool task_valid,struct audit_buffer * audit_buf)687 static inline void xfrm_audit_helper_usrinfo(bool task_valid,
688 struct audit_buffer *audit_buf)
689 {
690 const unsigned int auid = from_kuid(&init_user_ns, task_valid ?
691 audit_get_loginuid(current) :
692 INVALID_UID);
693 const unsigned int ses = task_valid ? audit_get_sessionid(current) :
694 AUDIT_SID_UNSET;
695
696 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
697 audit_log_task_context(audit_buf);
698 }
699
700 void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid);
701 void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
702 bool task_valid);
703 void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid);
704 void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid);
705 void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
706 struct sk_buff *skb);
707 void xfrm_audit_state_replay(struct xfrm_state *x, struct sk_buff *skb,
708 __be32 net_seq);
709 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
710 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, __be32 net_spi,
711 __be32 net_seq);
712 void xfrm_audit_state_icvfail(struct xfrm_state *x, struct sk_buff *skb,
713 u8 proto);
714 #else
715
xfrm_audit_policy_add(struct xfrm_policy * xp,int result,bool task_valid)716 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
717 bool task_valid)
718 {
719 }
720
xfrm_audit_policy_delete(struct xfrm_policy * xp,int result,bool task_valid)721 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
722 bool task_valid)
723 {
724 }
725
xfrm_audit_state_add(struct xfrm_state * x,int result,bool task_valid)726 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
727 bool task_valid)
728 {
729 }
730
xfrm_audit_state_delete(struct xfrm_state * x,int result,bool task_valid)731 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
732 bool task_valid)
733 {
734 }
735
xfrm_audit_state_replay_overflow(struct xfrm_state * x,struct sk_buff * skb)736 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
737 struct sk_buff *skb)
738 {
739 }
740
xfrm_audit_state_replay(struct xfrm_state * x,struct sk_buff * skb,__be32 net_seq)741 static inline void xfrm_audit_state_replay(struct xfrm_state *x,
742 struct sk_buff *skb, __be32 net_seq)
743 {
744 }
745
xfrm_audit_state_notfound_simple(struct sk_buff * skb,u16 family)746 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
747 u16 family)
748 {
749 }
750
xfrm_audit_state_notfound(struct sk_buff * skb,u16 family,__be32 net_spi,__be32 net_seq)751 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
752 __be32 net_spi, __be32 net_seq)
753 {
754 }
755
xfrm_audit_state_icvfail(struct xfrm_state * x,struct sk_buff * skb,u8 proto)756 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
757 struct sk_buff *skb, u8 proto)
758 {
759 }
760 #endif /* CONFIG_AUDITSYSCALL */
761
xfrm_pol_hold(struct xfrm_policy * policy)762 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
763 {
764 if (likely(policy != NULL))
765 refcount_inc(&policy->refcnt);
766 }
767
768 void xfrm_policy_destroy(struct xfrm_policy *policy);
769
xfrm_pol_put(struct xfrm_policy * policy)770 static inline void xfrm_pol_put(struct xfrm_policy *policy)
771 {
772 if (refcount_dec_and_test(&policy->refcnt))
773 xfrm_policy_destroy(policy);
774 }
775
xfrm_pols_put(struct xfrm_policy ** pols,int npols)776 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
777 {
778 int i;
779 for (i = npols - 1; i >= 0; --i)
780 xfrm_pol_put(pols[i]);
781 }
782
783 void __xfrm_state_destroy(struct xfrm_state *, bool);
784
__xfrm_state_put(struct xfrm_state * x)785 static inline void __xfrm_state_put(struct xfrm_state *x)
786 {
787 refcount_dec(&x->refcnt);
788 }
789
xfrm_state_put(struct xfrm_state * x)790 static inline void xfrm_state_put(struct xfrm_state *x)
791 {
792 if (refcount_dec_and_test(&x->refcnt))
793 __xfrm_state_destroy(x, false);
794 }
795
xfrm_state_put_sync(struct xfrm_state * x)796 static inline void xfrm_state_put_sync(struct xfrm_state *x)
797 {
798 if (refcount_dec_and_test(&x->refcnt))
799 __xfrm_state_destroy(x, true);
800 }
801
xfrm_state_hold(struct xfrm_state * x)802 static inline void xfrm_state_hold(struct xfrm_state *x)
803 {
804 refcount_inc(&x->refcnt);
805 }
806
addr_match(const void * token1,const void * token2,unsigned int prefixlen)807 static inline bool addr_match(const void *token1, const void *token2,
808 unsigned int prefixlen)
809 {
810 const __be32 *a1 = token1;
811 const __be32 *a2 = token2;
812 unsigned int pdw;
813 unsigned int pbi;
814
815 pdw = prefixlen >> 5; /* num of whole u32 in prefix */
816 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
817
818 if (pdw)
819 if (memcmp(a1, a2, pdw << 2))
820 return false;
821
822 if (pbi) {
823 __be32 mask;
824
825 mask = htonl((0xffffffff) << (32 - pbi));
826
827 if ((a1[pdw] ^ a2[pdw]) & mask)
828 return false;
829 }
830
831 return true;
832 }
833
addr4_match(__be32 a1,__be32 a2,u8 prefixlen)834 static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen)
835 {
836 /* C99 6.5.7 (3): u32 << 32 is undefined behaviour */
837 if (sizeof(long) == 4 && prefixlen == 0)
838 return true;
839 return !((a1 ^ a2) & htonl(~0UL << (32 - prefixlen)));
840 }
841
842 static __inline__
xfrm_flowi_sport(const struct flowi * fl,const union flowi_uli * uli)843 __be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli)
844 {
845 __be16 port;
846 switch(fl->flowi_proto) {
847 case IPPROTO_TCP:
848 case IPPROTO_UDP:
849 case IPPROTO_UDPLITE:
850 case IPPROTO_SCTP:
851 port = uli->ports.sport;
852 break;
853 case IPPROTO_ICMP:
854 case IPPROTO_ICMPV6:
855 port = htons(uli->icmpt.type);
856 break;
857 case IPPROTO_MH:
858 port = htons(uli->mht.type);
859 break;
860 case IPPROTO_GRE:
861 port = htons(ntohl(uli->gre_key) >> 16);
862 break;
863 default:
864 port = 0; /*XXX*/
865 }
866 return port;
867 }
868
869 static __inline__
xfrm_flowi_dport(const struct flowi * fl,const union flowi_uli * uli)870 __be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli)
871 {
872 __be16 port;
873 switch(fl->flowi_proto) {
874 case IPPROTO_TCP:
875 case IPPROTO_UDP:
876 case IPPROTO_UDPLITE:
877 case IPPROTO_SCTP:
878 port = uli->ports.dport;
879 break;
880 case IPPROTO_ICMP:
881 case IPPROTO_ICMPV6:
882 port = htons(uli->icmpt.code);
883 break;
884 case IPPROTO_GRE:
885 port = htons(ntohl(uli->gre_key) & 0xffff);
886 break;
887 default:
888 port = 0; /*XXX*/
889 }
890 return port;
891 }
892
893 bool xfrm_selector_match(const struct xfrm_selector *sel,
894 const struct flowi *fl, unsigned short family);
895
896 #ifdef CONFIG_SECURITY_NETWORK_XFRM
897 /* If neither has a context --> match
898 * Otherwise, both must have a context and the sids, doi, alg must match
899 */
xfrm_sec_ctx_match(struct xfrm_sec_ctx * s1,struct xfrm_sec_ctx * s2)900 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
901 {
902 return ((!s1 && !s2) ||
903 (s1 && s2 &&
904 (s1->ctx_sid == s2->ctx_sid) &&
905 (s1->ctx_doi == s2->ctx_doi) &&
906 (s1->ctx_alg == s2->ctx_alg)));
907 }
908 #else
xfrm_sec_ctx_match(struct xfrm_sec_ctx * s1,struct xfrm_sec_ctx * s2)909 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
910 {
911 return true;
912 }
913 #endif
914
915 /* A struct encoding bundle of transformations to apply to some set of flow.
916 *
917 * xdst->child points to the next element of bundle.
918 * dst->xfrm points to an instanse of transformer.
919 *
920 * Due to unfortunate limitations of current routing cache, which we
921 * have no time to fix, it mirrors struct rtable and bound to the same
922 * routing key, including saddr,daddr. However, we can have many of
923 * bundles differing by session id. All the bundles grow from a parent
924 * policy rule.
925 */
926 struct xfrm_dst {
927 union {
928 struct dst_entry dst;
929 struct rtable rt;
930 struct rt6_info rt6;
931 } u;
932 struct dst_entry *route;
933 struct dst_entry *child;
934 struct dst_entry *path;
935 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
936 int num_pols, num_xfrms;
937 u32 xfrm_genid;
938 u32 policy_genid;
939 u32 route_mtu_cached;
940 u32 child_mtu_cached;
941 u32 route_cookie;
942 u32 path_cookie;
943 };
944
xfrm_dst_path(const struct dst_entry * dst)945 static inline struct dst_entry *xfrm_dst_path(const struct dst_entry *dst)
946 {
947 #ifdef CONFIG_XFRM
948 if (dst->xfrm) {
949 const struct xfrm_dst *xdst = (const struct xfrm_dst *) dst;
950
951 return xdst->path;
952 }
953 #endif
954 return (struct dst_entry *) dst;
955 }
956
xfrm_dst_child(const struct dst_entry * dst)957 static inline struct dst_entry *xfrm_dst_child(const struct dst_entry *dst)
958 {
959 #ifdef CONFIG_XFRM
960 if (dst->xfrm) {
961 struct xfrm_dst *xdst = (struct xfrm_dst *) dst;
962 return xdst->child;
963 }
964 #endif
965 return NULL;
966 }
967
968 #ifdef CONFIG_XFRM
xfrm_dst_set_child(struct xfrm_dst * xdst,struct dst_entry * child)969 static inline void xfrm_dst_set_child(struct xfrm_dst *xdst, struct dst_entry *child)
970 {
971 xdst->child = child;
972 }
973
xfrm_dst_destroy(struct xfrm_dst * xdst)974 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
975 {
976 xfrm_pols_put(xdst->pols, xdst->num_pols);
977 dst_release(xdst->route);
978 if (likely(xdst->u.dst.xfrm))
979 xfrm_state_put(xdst->u.dst.xfrm);
980 }
981 #endif
982
983 void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
984
985 struct xfrm_if_parms {
986 int link; /* ifindex of underlying L2 interface */
987 u32 if_id; /* interface identifyer */
988 };
989
990 struct xfrm_if {
991 struct xfrm_if __rcu *next; /* next interface in list */
992 struct net_device *dev; /* virtual device associated with interface */
993 struct net *net; /* netns for packet i/o */
994 struct xfrm_if_parms p; /* interface parms */
995
996 struct gro_cells gro_cells;
997 };
998
999 struct xfrm_offload {
1000 /* Output sequence number for replay protection on offloading. */
1001 struct {
1002 __u32 low;
1003 __u32 hi;
1004 } seq;
1005
1006 __u32 flags;
1007 #define SA_DELETE_REQ 1
1008 #define CRYPTO_DONE 2
1009 #define CRYPTO_NEXT_DONE 4
1010 #define CRYPTO_FALLBACK 8
1011 #define XFRM_GSO_SEGMENT 16
1012 #define XFRM_GRO 32
1013 #define XFRM_ESP_NO_TRAILER 64
1014 #define XFRM_DEV_RESUME 128
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
1033 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
1034 struct xfrm_offload ovec[XFRM_MAX_OFFLOAD_DEPTH];
1035 };
1036
1037 struct sec_path *secpath_set(struct sk_buff *skb);
1038
1039 static inline void
secpath_reset(struct sk_buff * skb)1040 secpath_reset(struct sk_buff *skb)
1041 {
1042 #ifdef CONFIG_XFRM
1043 skb_ext_del(skb, SKB_EXT_SEC_PATH);
1044 #endif
1045 }
1046
1047 static inline int
xfrm_addr_any(const xfrm_address_t * addr,unsigned short family)1048 xfrm_addr_any(const xfrm_address_t *addr, unsigned short family)
1049 {
1050 switch (family) {
1051 case AF_INET:
1052 return addr->a4 == 0;
1053 case AF_INET6:
1054 return ipv6_addr_any(&addr->in6);
1055 }
1056 return 0;
1057 }
1058
1059 static inline int
__xfrm4_state_addr_cmp(const struct xfrm_tmpl * tmpl,const struct xfrm_state * x)1060 __xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1061 {
1062 return (tmpl->saddr.a4 &&
1063 tmpl->saddr.a4 != x->props.saddr.a4);
1064 }
1065
1066 static inline int
__xfrm6_state_addr_cmp(const struct xfrm_tmpl * tmpl,const struct xfrm_state * x)1067 __xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1068 {
1069 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
1070 !ipv6_addr_equal((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
1071 }
1072
1073 static inline int
xfrm_state_addr_cmp(const struct xfrm_tmpl * tmpl,const struct xfrm_state * x,unsigned short family)1074 xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family)
1075 {
1076 switch (family) {
1077 case AF_INET:
1078 return __xfrm4_state_addr_cmp(tmpl, x);
1079 case AF_INET6:
1080 return __xfrm6_state_addr_cmp(tmpl, x);
1081 }
1082 return !0;
1083 }
1084
1085 #ifdef CONFIG_XFRM
1086 int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb,
1087 unsigned short family);
1088
__xfrm_policy_check2(struct sock * sk,int dir,struct sk_buff * skb,unsigned int family,int reverse)1089 static inline int __xfrm_policy_check2(struct sock *sk, int dir,
1090 struct sk_buff *skb,
1091 unsigned int family, int reverse)
1092 {
1093 struct net *net = dev_net(skb->dev);
1094 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
1095
1096 if (sk && sk->sk_policy[XFRM_POLICY_IN])
1097 return __xfrm_policy_check(sk, ndir, skb, family);
1098
1099 return (!net->xfrm.policy_count[dir] && !secpath_exists(skb)) ||
1100 (skb_dst(skb)->flags & DST_NOPOLICY) ||
1101 __xfrm_policy_check(sk, ndir, skb, family);
1102 }
1103
xfrm_policy_check(struct sock * sk,int dir,struct sk_buff * skb,unsigned short family)1104 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1105 {
1106 return __xfrm_policy_check2(sk, dir, skb, family, 0);
1107 }
1108
xfrm4_policy_check(struct sock * sk,int dir,struct sk_buff * skb)1109 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1110 {
1111 return xfrm_policy_check(sk, dir, skb, AF_INET);
1112 }
1113
xfrm6_policy_check(struct sock * sk,int dir,struct sk_buff * skb)1114 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1115 {
1116 return xfrm_policy_check(sk, dir, skb, AF_INET6);
1117 }
1118
xfrm4_policy_check_reverse(struct sock * sk,int dir,struct sk_buff * skb)1119 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1120 struct sk_buff *skb)
1121 {
1122 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1123 }
1124
xfrm6_policy_check_reverse(struct sock * sk,int dir,struct sk_buff * skb)1125 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1126 struct sk_buff *skb)
1127 {
1128 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1129 }
1130
1131 int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1132 unsigned int family, int reverse);
1133
xfrm_decode_session(struct sk_buff * skb,struct flowi * fl,unsigned int family)1134 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1135 unsigned int family)
1136 {
1137 return __xfrm_decode_session(skb, fl, family, 0);
1138 }
1139
xfrm_decode_session_reverse(struct sk_buff * skb,struct flowi * fl,unsigned int family)1140 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1141 struct flowi *fl,
1142 unsigned int family)
1143 {
1144 return __xfrm_decode_session(skb, fl, family, 1);
1145 }
1146
1147 int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1148
xfrm_route_forward(struct sk_buff * skb,unsigned short family)1149 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1150 {
1151 struct net *net = dev_net(skb->dev);
1152
1153 return !net->xfrm.policy_count[XFRM_POLICY_OUT] ||
1154 (skb_dst(skb)->flags & DST_NOXFRM) ||
1155 __xfrm_route_forward(skb, family);
1156 }
1157
xfrm4_route_forward(struct sk_buff * skb)1158 static inline int xfrm4_route_forward(struct sk_buff *skb)
1159 {
1160 return xfrm_route_forward(skb, AF_INET);
1161 }
1162
xfrm6_route_forward(struct sk_buff * skb)1163 static inline int xfrm6_route_forward(struct sk_buff *skb)
1164 {
1165 return xfrm_route_forward(skb, AF_INET6);
1166 }
1167
1168 int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk);
1169
xfrm_sk_clone_policy(struct sock * sk,const struct sock * osk)1170 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk)
1171 {
1172 sk->sk_policy[0] = NULL;
1173 sk->sk_policy[1] = NULL;
1174 if (unlikely(osk->sk_policy[0] || osk->sk_policy[1]))
1175 return __xfrm_sk_clone_policy(sk, osk);
1176 return 0;
1177 }
1178
1179 int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1180
xfrm_sk_free_policy(struct sock * sk)1181 static inline void xfrm_sk_free_policy(struct sock *sk)
1182 {
1183 struct xfrm_policy *pol;
1184
1185 pol = rcu_dereference_protected(sk->sk_policy[0], 1);
1186 if (unlikely(pol != NULL)) {
1187 xfrm_policy_delete(pol, XFRM_POLICY_MAX);
1188 sk->sk_policy[0] = NULL;
1189 }
1190 pol = rcu_dereference_protected(sk->sk_policy[1], 1);
1191 if (unlikely(pol != NULL)) {
1192 xfrm_policy_delete(pol, XFRM_POLICY_MAX+1);
1193 sk->sk_policy[1] = NULL;
1194 }
1195 }
1196
1197 #else
1198
xfrm_sk_free_policy(struct sock * sk)1199 static inline void xfrm_sk_free_policy(struct sock *sk) {}
xfrm_sk_clone_policy(struct sock * sk,const struct sock * osk)1200 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) { return 0; }
xfrm6_route_forward(struct sk_buff * skb)1201 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
xfrm4_route_forward(struct sk_buff * skb)1202 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
xfrm6_policy_check(struct sock * sk,int dir,struct sk_buff * skb)1203 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1204 {
1205 return 1;
1206 }
xfrm4_policy_check(struct sock * sk,int dir,struct sk_buff * skb)1207 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1208 {
1209 return 1;
1210 }
xfrm_policy_check(struct sock * sk,int dir,struct sk_buff * skb,unsigned short family)1211 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1212 {
1213 return 1;
1214 }
xfrm_decode_session_reverse(struct sk_buff * skb,struct flowi * fl,unsigned int family)1215 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1216 struct flowi *fl,
1217 unsigned int family)
1218 {
1219 return -ENOSYS;
1220 }
xfrm4_policy_check_reverse(struct sock * sk,int dir,struct sk_buff * skb)1221 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1222 struct sk_buff *skb)
1223 {
1224 return 1;
1225 }
xfrm6_policy_check_reverse(struct sock * sk,int dir,struct sk_buff * skb)1226 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1227 struct sk_buff *skb)
1228 {
1229 return 1;
1230 }
1231 #endif
1232
1233 static __inline__
xfrm_flowi_daddr(const struct flowi * fl,unsigned short family)1234 xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family)
1235 {
1236 switch (family){
1237 case AF_INET:
1238 return (xfrm_address_t *)&fl->u.ip4.daddr;
1239 case AF_INET6:
1240 return (xfrm_address_t *)&fl->u.ip6.daddr;
1241 }
1242 return NULL;
1243 }
1244
1245 static __inline__
xfrm_flowi_saddr(const struct flowi * fl,unsigned short family)1246 xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family)
1247 {
1248 switch (family){
1249 case AF_INET:
1250 return (xfrm_address_t *)&fl->u.ip4.saddr;
1251 case AF_INET6:
1252 return (xfrm_address_t *)&fl->u.ip6.saddr;
1253 }
1254 return NULL;
1255 }
1256
1257 static __inline__
xfrm_flowi_addr_get(const struct flowi * fl,xfrm_address_t * saddr,xfrm_address_t * daddr,unsigned short family)1258 void xfrm_flowi_addr_get(const struct flowi *fl,
1259 xfrm_address_t *saddr, xfrm_address_t *daddr,
1260 unsigned short family)
1261 {
1262 switch(family) {
1263 case AF_INET:
1264 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4));
1265 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4));
1266 break;
1267 case AF_INET6:
1268 saddr->in6 = fl->u.ip6.saddr;
1269 daddr->in6 = fl->u.ip6.daddr;
1270 break;
1271 }
1272 }
1273
1274 static __inline__ int
__xfrm4_state_addr_check(const struct xfrm_state * x,const xfrm_address_t * daddr,const xfrm_address_t * saddr)1275 __xfrm4_state_addr_check(const struct xfrm_state *x,
1276 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1277 {
1278 if (daddr->a4 == x->id.daddr.a4 &&
1279 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1280 return 1;
1281 return 0;
1282 }
1283
1284 static __inline__ int
__xfrm6_state_addr_check(const struct xfrm_state * x,const xfrm_address_t * daddr,const xfrm_address_t * saddr)1285 __xfrm6_state_addr_check(const struct xfrm_state *x,
1286 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1287 {
1288 if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1289 (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) ||
1290 ipv6_addr_any((struct in6_addr *)saddr) ||
1291 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1292 return 1;
1293 return 0;
1294 }
1295
1296 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)1297 xfrm_state_addr_check(const struct xfrm_state *x,
1298 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1299 unsigned short family)
1300 {
1301 switch (family) {
1302 case AF_INET:
1303 return __xfrm4_state_addr_check(x, daddr, saddr);
1304 case AF_INET6:
1305 return __xfrm6_state_addr_check(x, daddr, saddr);
1306 }
1307 return 0;
1308 }
1309
1310 static __inline__ int
xfrm_state_addr_flow_check(const struct xfrm_state * x,const struct flowi * fl,unsigned short family)1311 xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl,
1312 unsigned short family)
1313 {
1314 switch (family) {
1315 case AF_INET:
1316 return __xfrm4_state_addr_check(x,
1317 (const xfrm_address_t *)&fl->u.ip4.daddr,
1318 (const xfrm_address_t *)&fl->u.ip4.saddr);
1319 case AF_INET6:
1320 return __xfrm6_state_addr_check(x,
1321 (const xfrm_address_t *)&fl->u.ip6.daddr,
1322 (const xfrm_address_t *)&fl->u.ip6.saddr);
1323 }
1324 return 0;
1325 }
1326
xfrm_state_kern(const struct xfrm_state * x)1327 static inline int xfrm_state_kern(const struct xfrm_state *x)
1328 {
1329 return atomic_read(&x->tunnel_users);
1330 }
1331
xfrm_id_proto_valid(u8 proto)1332 static inline bool xfrm_id_proto_valid(u8 proto)
1333 {
1334 switch (proto) {
1335 case IPPROTO_AH:
1336 case IPPROTO_ESP:
1337 case IPPROTO_COMP:
1338 #if IS_ENABLED(CONFIG_IPV6)
1339 case IPPROTO_ROUTING:
1340 case IPPROTO_DSTOPTS:
1341 #endif
1342 return true;
1343 default:
1344 return false;
1345 }
1346 }
1347
1348 /* IPSEC_PROTO_ANY only matches 3 IPsec protocols, 0 could match all. */
xfrm_id_proto_match(u8 proto,u8 userproto)1349 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1350 {
1351 return (!userproto || proto == userproto ||
1352 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1353 proto == IPPROTO_ESP ||
1354 proto == IPPROTO_COMP)));
1355 }
1356
1357 /*
1358 * xfrm algorithm information
1359 */
1360 struct xfrm_algo_aead_info {
1361 char *geniv;
1362 u16 icv_truncbits;
1363 };
1364
1365 struct xfrm_algo_auth_info {
1366 u16 icv_truncbits;
1367 u16 icv_fullbits;
1368 };
1369
1370 struct xfrm_algo_encr_info {
1371 char *geniv;
1372 u16 blockbits;
1373 u16 defkeybits;
1374 };
1375
1376 struct xfrm_algo_comp_info {
1377 u16 threshold;
1378 };
1379
1380 struct xfrm_algo_desc {
1381 char *name;
1382 char *compat;
1383 u8 available:1;
1384 u8 pfkey_supported:1;
1385 union {
1386 struct xfrm_algo_aead_info aead;
1387 struct xfrm_algo_auth_info auth;
1388 struct xfrm_algo_encr_info encr;
1389 struct xfrm_algo_comp_info comp;
1390 } uinfo;
1391 struct sadb_alg desc;
1392 };
1393
1394 /* XFRM protocol handlers. */
1395 struct xfrm4_protocol {
1396 int (*handler)(struct sk_buff *skb);
1397 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1398 int encap_type);
1399 int (*cb_handler)(struct sk_buff *skb, int err);
1400 int (*err_handler)(struct sk_buff *skb, u32 info);
1401
1402 struct xfrm4_protocol __rcu *next;
1403 int priority;
1404 };
1405
1406 struct xfrm6_protocol {
1407 int (*handler)(struct sk_buff *skb);
1408 int (*cb_handler)(struct sk_buff *skb, int err);
1409 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1410 u8 type, u8 code, int offset, __be32 info);
1411
1412 struct xfrm6_protocol __rcu *next;
1413 int priority;
1414 };
1415
1416 /* XFRM tunnel handlers. */
1417 struct xfrm_tunnel {
1418 int (*handler)(struct sk_buff *skb);
1419 int (*err_handler)(struct sk_buff *skb, u32 info);
1420
1421 struct xfrm_tunnel __rcu *next;
1422 int priority;
1423 };
1424
1425 struct xfrm6_tunnel {
1426 int (*handler)(struct sk_buff *skb);
1427 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1428 u8 type, u8 code, int offset, __be32 info);
1429 struct xfrm6_tunnel __rcu *next;
1430 int priority;
1431 };
1432
1433 void xfrm_init(void);
1434 void xfrm4_init(void);
1435 int xfrm_state_init(struct net *net);
1436 void xfrm_state_fini(struct net *net);
1437 void xfrm4_state_init(void);
1438 void xfrm4_protocol_init(void);
1439 #ifdef CONFIG_XFRM
1440 int xfrm6_init(void);
1441 void xfrm6_fini(void);
1442 int xfrm6_state_init(void);
1443 void xfrm6_state_fini(void);
1444 int xfrm6_protocol_init(void);
1445 void xfrm6_protocol_fini(void);
1446 #else
xfrm6_init(void)1447 static inline int xfrm6_init(void)
1448 {
1449 return 0;
1450 }
xfrm6_fini(void)1451 static inline void xfrm6_fini(void)
1452 {
1453 ;
1454 }
1455 #endif
1456
1457 #ifdef CONFIG_XFRM_STATISTICS
1458 int xfrm_proc_init(struct net *net);
1459 void xfrm_proc_fini(struct net *net);
1460 #endif
1461
1462 int xfrm_sysctl_init(struct net *net);
1463 #ifdef CONFIG_SYSCTL
1464 void xfrm_sysctl_fini(struct net *net);
1465 #else
xfrm_sysctl_fini(struct net * net)1466 static inline void xfrm_sysctl_fini(struct net *net)
1467 {
1468 }
1469 #endif
1470
1471 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
1472 struct xfrm_address_filter *filter);
1473 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1474 int (*func)(struct xfrm_state *, int, void*), void *);
1475 void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net);
1476 struct xfrm_state *xfrm_state_alloc(struct net *net);
1477 void xfrm_state_free(struct xfrm_state *x);
1478 struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr,
1479 const xfrm_address_t *saddr,
1480 const struct flowi *fl,
1481 struct xfrm_tmpl *tmpl,
1482 struct xfrm_policy *pol, int *err,
1483 unsigned short family, u32 if_id);
1484 struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark, u32 if_id,
1485 xfrm_address_t *daddr,
1486 xfrm_address_t *saddr,
1487 unsigned short family,
1488 u8 mode, u8 proto, u32 reqid);
1489 struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
1490 unsigned short family);
1491 int xfrm_state_check_expire(struct xfrm_state *x);
1492 void xfrm_state_insert(struct xfrm_state *x);
1493 int xfrm_state_add(struct xfrm_state *x);
1494 int xfrm_state_update(struct xfrm_state *x);
1495 struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1496 const xfrm_address_t *daddr, __be32 spi,
1497 u8 proto, unsigned short family);
1498 struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1499 const xfrm_address_t *daddr,
1500 const xfrm_address_t *saddr,
1501 u8 proto,
1502 unsigned short family);
1503 #ifdef CONFIG_XFRM_SUB_POLICY
1504 void xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1505 unsigned short family);
1506 void xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1507 unsigned short family);
1508 #else
xfrm_tmpl_sort(struct xfrm_tmpl ** d,struct xfrm_tmpl ** s,int n,unsigned short family)1509 static inline void xfrm_tmpl_sort(struct xfrm_tmpl **d, struct xfrm_tmpl **s,
1510 int n, unsigned short family)
1511 {
1512 }
1513
xfrm_state_sort(struct xfrm_state ** d,struct xfrm_state ** s,int n,unsigned short family)1514 static inline void xfrm_state_sort(struct xfrm_state **d, struct xfrm_state **s,
1515 int n, unsigned short family)
1516 {
1517 }
1518 #endif
1519
1520 struct xfrmk_sadinfo {
1521 u32 sadhcnt; /* current hash bkts */
1522 u32 sadhmcnt; /* max allowed hash bkts */
1523 u32 sadcnt; /* current running count */
1524 };
1525
1526 struct xfrmk_spdinfo {
1527 u32 incnt;
1528 u32 outcnt;
1529 u32 fwdcnt;
1530 u32 inscnt;
1531 u32 outscnt;
1532 u32 fwdscnt;
1533 u32 spdhcnt;
1534 u32 spdhmcnt;
1535 };
1536
1537 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1538 int xfrm_state_delete(struct xfrm_state *x);
1539 int xfrm_state_flush(struct net *net, u8 proto, bool task_valid, bool sync);
1540 int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid);
1541 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1542 void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1543 u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq);
1544 int xfrm_init_replay(struct xfrm_state *x);
1545 u32 xfrm_state_mtu(struct xfrm_state *x, int mtu);
1546 int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload);
1547 int xfrm_init_state(struct xfrm_state *x);
1548 int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type);
1549 int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1550 int xfrm_trans_queue(struct sk_buff *skb,
1551 int (*finish)(struct net *, struct sock *,
1552 struct sk_buff *));
1553 int xfrm_output_resume(struct sk_buff *skb, int err);
1554 int xfrm_output(struct sock *sk, struct sk_buff *skb);
1555
1556 #if IS_ENABLED(CONFIG_NET_PKTGEN)
1557 int pktgen_xfrm_outer_mode_output(struct xfrm_state *x, struct sk_buff *skb);
1558 #endif
1559
1560 void xfrm_local_error(struct sk_buff *skb, int mtu);
1561 int xfrm4_extract_header(struct sk_buff *skb);
1562 int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1563 int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1564 int encap_type);
1565 int xfrm4_transport_finish(struct sk_buff *skb, int async);
1566 int xfrm4_rcv(struct sk_buff *skb);
1567 int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1568
xfrm4_rcv_spi(struct sk_buff * skb,int nexthdr,__be32 spi)1569 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1570 {
1571 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
1572 XFRM_SPI_SKB_CB(skb)->family = AF_INET;
1573 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
1574 return xfrm_input(skb, nexthdr, spi, 0);
1575 }
1576
1577 int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1578 int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1579 int xfrm4_output_finish(struct sock *sk, struct sk_buff *skb);
1580 int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol);
1581 int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol);
1582 int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1583 int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1584 void xfrm4_local_error(struct sk_buff *skb, u32 mtu);
1585 int xfrm6_extract_header(struct sk_buff *skb);
1586 int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1587 int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi,
1588 struct ip6_tnl *t);
1589 int xfrm6_transport_finish(struct sk_buff *skb, int async);
1590 int xfrm6_rcv_tnl(struct sk_buff *skb, struct ip6_tnl *t);
1591 int xfrm6_rcv(struct sk_buff *skb);
1592 int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1593 xfrm_address_t *saddr, u8 proto);
1594 void xfrm6_local_error(struct sk_buff *skb, u32 mtu);
1595 int xfrm6_protocol_register(struct xfrm6_protocol *handler, unsigned char protocol);
1596 int xfrm6_protocol_deregister(struct xfrm6_protocol *handler, unsigned char protocol);
1597 int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1598 int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1599 __be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1600 __be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr);
1601 int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1602 int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1603 int xfrm6_output_finish(struct sock *sk, struct sk_buff *skb);
1604 int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1605 u8 **prevhdr);
1606
1607 #ifdef CONFIG_XFRM
1608 int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1609 int xfrm_user_policy(struct sock *sk, int optname,
1610 u8 __user *optval, int optlen);
1611 #else
xfrm_user_policy(struct sock * sk,int optname,u8 __user * optval,int optlen)1612 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1613 {
1614 return -ENOPROTOOPT;
1615 }
1616
xfrm4_udp_encap_rcv(struct sock * sk,struct sk_buff * skb)1617 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1618 {
1619 /* should not happen */
1620 kfree_skb(skb);
1621 return 0;
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, u32 mark, u32 if_id,
1639 u8 type, int dir,
1640 struct xfrm_selector *sel,
1641 struct xfrm_sec_ctx *ctx, int delete,
1642 int *err);
1643 struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u32 if_id, u8,
1644 int dir, u32 id, int delete, int *err);
1645 int xfrm_policy_flush(struct net *net, u8 type, bool task_valid);
1646 void xfrm_policy_hash_rebuild(struct net *net);
1647 u32 xfrm_get_acqseq(void);
1648 int verify_spi_info(u8 proto, u32 min, u32 max);
1649 int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1650 struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark,
1651 u8 mode, u32 reqid, u32 if_id, u8 proto,
1652 const xfrm_address_t *daddr,
1653 const xfrm_address_t *saddr, int create,
1654 unsigned short family);
1655 int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1656
1657 #ifdef CONFIG_XFRM_MIGRATE
1658 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1659 const struct xfrm_migrate *m, int num_bundles,
1660 const struct xfrm_kmaddress *k,
1661 const struct xfrm_encap_tmpl *encap);
1662 struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net);
1663 struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1664 struct xfrm_migrate *m,
1665 struct xfrm_encap_tmpl *encap);
1666 int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1667 struct xfrm_migrate *m, int num_bundles,
1668 struct xfrm_kmaddress *k, struct net *net,
1669 struct xfrm_encap_tmpl *encap);
1670 #endif
1671
1672 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1673 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid);
1674 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel,
1675 xfrm_address_t *addr);
1676
1677 void xfrm_input_init(void);
1678 int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1679
1680 void xfrm_probe_algs(void);
1681 int xfrm_count_pfkey_auth_supported(void);
1682 int xfrm_count_pfkey_enc_supported(void);
1683 struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1684 struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1685 struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1686 struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1687 struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1688 struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe);
1689 struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe);
1690 struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe);
1691 struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len,
1692 int probe);
1693
xfrm6_addr_equal(const xfrm_address_t * a,const xfrm_address_t * b)1694 static inline bool xfrm6_addr_equal(const xfrm_address_t *a,
1695 const xfrm_address_t *b)
1696 {
1697 return ipv6_addr_equal((const struct in6_addr *)a,
1698 (const struct in6_addr *)b);
1699 }
1700
xfrm_addr_equal(const xfrm_address_t * a,const xfrm_address_t * b,sa_family_t family)1701 static inline bool xfrm_addr_equal(const xfrm_address_t *a,
1702 const xfrm_address_t *b,
1703 sa_family_t family)
1704 {
1705 switch (family) {
1706 default:
1707 case AF_INET:
1708 return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0;
1709 case AF_INET6:
1710 return xfrm6_addr_equal(a, b);
1711 }
1712 }
1713
xfrm_policy_id2dir(u32 index)1714 static inline int xfrm_policy_id2dir(u32 index)
1715 {
1716 return index & 7;
1717 }
1718
1719 #ifdef CONFIG_XFRM
xfrm_aevent_is_on(struct net * net)1720 static inline int xfrm_aevent_is_on(struct net *net)
1721 {
1722 struct sock *nlsk;
1723 int ret = 0;
1724
1725 rcu_read_lock();
1726 nlsk = rcu_dereference(net->xfrm.nlsk);
1727 if (nlsk)
1728 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1729 rcu_read_unlock();
1730 return ret;
1731 }
1732
xfrm_acquire_is_on(struct net * net)1733 static inline int xfrm_acquire_is_on(struct net *net)
1734 {
1735 struct sock *nlsk;
1736 int ret = 0;
1737
1738 rcu_read_lock();
1739 nlsk = rcu_dereference(net->xfrm.nlsk);
1740 if (nlsk)
1741 ret = netlink_has_listeners(nlsk, XFRMNLGRP_ACQUIRE);
1742 rcu_read_unlock();
1743
1744 return ret;
1745 }
1746 #endif
1747
aead_len(struct xfrm_algo_aead * alg)1748 static inline unsigned int aead_len(struct xfrm_algo_aead *alg)
1749 {
1750 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1751 }
1752
xfrm_alg_len(const struct xfrm_algo * alg)1753 static inline unsigned int xfrm_alg_len(const struct xfrm_algo *alg)
1754 {
1755 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1756 }
1757
xfrm_alg_auth_len(const struct xfrm_algo_auth * alg)1758 static inline unsigned int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg)
1759 {
1760 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1761 }
1762
xfrm_replay_state_esn_len(struct xfrm_replay_state_esn * replay_esn)1763 static inline unsigned int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn)
1764 {
1765 return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32);
1766 }
1767
1768 #ifdef CONFIG_XFRM_MIGRATE
xfrm_replay_clone(struct xfrm_state * x,struct xfrm_state * orig)1769 static inline int xfrm_replay_clone(struct xfrm_state *x,
1770 struct xfrm_state *orig)
1771 {
1772 x->replay_esn = kzalloc(xfrm_replay_state_esn_len(orig->replay_esn),
1773 GFP_KERNEL);
1774 if (!x->replay_esn)
1775 return -ENOMEM;
1776
1777 x->replay_esn->bmp_len = orig->replay_esn->bmp_len;
1778 x->replay_esn->replay_window = orig->replay_esn->replay_window;
1779
1780 x->preplay_esn = kmemdup(x->replay_esn,
1781 xfrm_replay_state_esn_len(x->replay_esn),
1782 GFP_KERNEL);
1783 if (!x->preplay_esn) {
1784 kfree(x->replay_esn);
1785 return -ENOMEM;
1786 }
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 #endif /* _NET_XFRM_H */
1999