1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _NET_XFRM_H
3 #define _NET_XFRM_H
4
5 #include <linux/compiler.h>
6 #include <linux/xfrm.h>
7 #include <linux/spinlock.h>
8 #include <linux/list.h>
9 #include <linux/skbuff.h>
10 #include <linux/socket.h>
11 #include <linux/pfkeyv2.h>
12 #include <linux/ipsec.h>
13 #include <linux/in6.h>
14 #include <linux/mutex.h>
15 #include <linux/audit.h>
16 #include <linux/slab.h>
17 #include <linux/refcount.h>
18 #include <linux/sockptr.h>
19
20 #include <net/sock.h>
21 #include <net/dst.h>
22 #include <net/ip.h>
23 #include <net/route.h>
24 #include <net/ipv6.h>
25 #include <net/ip6_fib.h>
26 #include <net/flow.h>
27 #include <net/gro_cells.h>
28
29 #include <linux/interrupt.h>
30
31 #ifdef CONFIG_XFRM_STATISTICS
32 #include <net/snmp.h>
33 #endif
34
35 #define XFRM_PROTO_ESP 50
36 #define XFRM_PROTO_AH 51
37 #define XFRM_PROTO_COMP 108
38 #define XFRM_PROTO_IPIP 4
39 #define XFRM_PROTO_IPV6 41
40 #define XFRM_PROTO_ROUTING IPPROTO_ROUTING
41 #define XFRM_PROTO_DSTOPTS IPPROTO_DSTOPTS
42
43 #define XFRM_ALIGN4(len) (((len) + 3) & ~3)
44 #define XFRM_ALIGN8(len) (((len) + 7) & ~7)
45 #define MODULE_ALIAS_XFRM_MODE(family, encap) \
46 MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap))
47 #define MODULE_ALIAS_XFRM_TYPE(family, proto) \
48 MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto))
49 #define MODULE_ALIAS_XFRM_OFFLOAD_TYPE(family, proto) \
50 MODULE_ALIAS("xfrm-offload-" __stringify(family) "-" __stringify(proto))
51
52 #ifdef CONFIG_XFRM_STATISTICS
53 #define XFRM_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.xfrm_statistics, field)
54 #else
55 #define XFRM_INC_STATS(net, field) ((void)(net))
56 #endif
57
58
59 /* Organization of SPD aka "XFRM rules"
60 ------------------------------------
61
62 Basic objects:
63 - policy rule, struct xfrm_policy (=SPD entry)
64 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
65 - instance of a transformer, struct xfrm_state (=SA)
66 - template to clone xfrm_state, struct xfrm_tmpl
67
68 SPD is plain linear list of xfrm_policy rules, ordered by priority.
69 (To be compatible with existing pfkeyv2 implementations,
70 many rules with priority of 0x7fffffff are allowed to exist and
71 such rules are ordered in an unpredictable way, thanks to bsd folks.)
72
73 Lookup is plain linear search until the first match with selector.
74
75 If "action" is "block", then we prohibit the flow, otherwise:
76 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
77 policy entry has list of up to XFRM_MAX_DEPTH transformations,
78 described by templates xfrm_tmpl. Each template is resolved
79 to a complete xfrm_state (see below) and we pack bundle of transformations
80 to a dst_entry returned to requestor.
81
82 dst -. xfrm .-> xfrm_state #1
83 |---. child .-> dst -. xfrm .-> xfrm_state #2
84 |---. child .-> dst -. xfrm .-> xfrm_state #3
85 |---. child .-> NULL
86
87 Bundles are cached at xrfm_policy struct (field ->bundles).
88
89
90 Resolution of xrfm_tmpl
91 -----------------------
92 Template contains:
93 1. ->mode Mode: transport or tunnel
94 2. ->id.proto Protocol: AH/ESP/IPCOMP
95 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode.
96 Q: allow to resolve security gateway?
97 4. ->id.spi If not zero, static SPI.
98 5. ->saddr Local tunnel endpoint, ignored for transport mode.
99 6. ->algos List of allowed algos. Plain bitmask now.
100 Q: ealgos, aalgos, calgos. What a mess...
101 7. ->share Sharing mode.
102 Q: how to implement private sharing mode? To add struct sock* to
103 flow id?
104
105 Having this template we search through SAD searching for entries
106 with appropriate mode/proto/algo, permitted by selector.
107 If no appropriate entry found, it is requested from key manager.
108
109 PROBLEMS:
110 Q: How to find all the bundles referring to a physical path for
111 PMTU discovery? Seems, dst should contain list of all parents...
112 and enter to infinite locking hierarchy disaster.
113 No! It is easier, we will not search for them, let them find us.
114 We add genid to each dst plus pointer to genid of raw IP route,
115 pmtu disc will update pmtu on raw IP route and increase its genid.
116 dst_check() will see this for top level and trigger resyncing
117 metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
118 */
119
120 struct xfrm_state_walk {
121 struct list_head all;
122 u8 state;
123 u8 dying;
124 u8 proto;
125 u32 seq;
126 struct xfrm_address_filter *filter;
127 };
128
129 enum {
130 XFRM_DEV_OFFLOAD_IN = 1,
131 XFRM_DEV_OFFLOAD_OUT,
132 XFRM_DEV_OFFLOAD_FWD,
133 };
134
135 enum {
136 XFRM_DEV_OFFLOAD_UNSPECIFIED,
137 XFRM_DEV_OFFLOAD_CRYPTO,
138 XFRM_DEV_OFFLOAD_PACKET,
139 };
140
141 enum {
142 XFRM_DEV_OFFLOAD_FLAG_ACQ = 1,
143 };
144
145 struct xfrm_dev_offload {
146 struct net_device *dev;
147 netdevice_tracker dev_tracker;
148 struct net_device *real_dev;
149 unsigned long offload_handle;
150 u8 dir : 2;
151 u8 type : 2;
152 u8 flags : 2;
153 };
154
155 struct xfrm_mode {
156 u8 encap;
157 u8 family;
158 u8 flags;
159 };
160
161 /* Flags for xfrm_mode. */
162 enum {
163 XFRM_MODE_FLAG_TUNNEL = 1,
164 };
165
166 enum xfrm_replay_mode {
167 XFRM_REPLAY_MODE_LEGACY,
168 XFRM_REPLAY_MODE_BMP,
169 XFRM_REPLAY_MODE_ESN,
170 };
171
172 /* Full description of state of transformer. */
173 struct xfrm_state {
174 possible_net_t xs_net;
175 union {
176 struct hlist_node gclist;
177 struct hlist_node bydst;
178 };
179 union {
180 struct hlist_node dev_gclist;
181 struct hlist_node bysrc;
182 };
183 struct hlist_node byspi;
184 struct hlist_node byseq;
185
186 refcount_t refcnt;
187 spinlock_t lock;
188
189 struct xfrm_id id;
190 struct xfrm_selector sel;
191 struct xfrm_mark mark;
192 u32 if_id;
193 u32 tfcpad;
194
195 u32 genid;
196
197 /* Key manager bits */
198 struct xfrm_state_walk km;
199
200 /* Parameters of this state. */
201 struct {
202 u32 reqid;
203 u8 mode;
204 u8 replay_window;
205 u8 aalgo, ealgo, calgo;
206 u8 flags;
207 u16 family;
208 xfrm_address_t saddr;
209 int header_len;
210 int trailer_len;
211 u32 extra_flags;
212 struct xfrm_mark smark;
213 } props;
214
215 struct xfrm_lifetime_cfg lft;
216
217 /* Data for transformer */
218 struct xfrm_algo_auth *aalg;
219 struct xfrm_algo *ealg;
220 struct xfrm_algo *calg;
221 struct xfrm_algo_aead *aead;
222 const char *geniv;
223
224 /* mapping change rate limiting */
225 __be16 new_mapping_sport;
226 u32 new_mapping; /* seconds */
227 u32 mapping_maxage; /* seconds for input SA */
228
229 /* Data for encapsulator */
230 struct xfrm_encap_tmpl *encap;
231 struct sock __rcu *encap_sk;
232
233 /* Data for care-of address */
234 xfrm_address_t *coaddr;
235
236 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
237 struct xfrm_state *tunnel;
238
239 /* If a tunnel, number of users + 1 */
240 atomic_t tunnel_users;
241
242 /* State for replay detection */
243 struct xfrm_replay_state replay;
244 struct xfrm_replay_state_esn *replay_esn;
245
246 /* Replay detection state at the time we sent the last notification */
247 struct xfrm_replay_state preplay;
248 struct xfrm_replay_state_esn *preplay_esn;
249
250 /* replay detection mode */
251 enum xfrm_replay_mode repl_mode;
252 /* internal flag that only holds state for delayed aevent at the
253 * moment
254 */
255 u32 xflags;
256
257 /* Replay detection notification settings */
258 u32 replay_maxage;
259 u32 replay_maxdiff;
260
261 /* Replay detection notification timer */
262 struct timer_list rtimer;
263
264 /* Statistics */
265 struct xfrm_stats stats;
266
267 struct xfrm_lifetime_cur curlft;
268 struct hrtimer mtimer;
269
270 struct xfrm_dev_offload xso;
271
272 /* used to fix curlft->add_time when changing date */
273 long saved_tmo;
274
275 /* Last used time */
276 time64_t lastused;
277
278 struct page_frag xfrag;
279
280 /* Reference to data common to all the instances of this
281 * transformer. */
282 const struct xfrm_type *type;
283 struct xfrm_mode inner_mode;
284 struct xfrm_mode inner_mode_iaf;
285 struct xfrm_mode outer_mode;
286
287 const struct xfrm_type_offload *type_offload;
288
289 /* Security context */
290 struct xfrm_sec_ctx *security;
291
292 /* Private data of this transformer, format is opaque,
293 * interpreted by xfrm_type methods. */
294 void *data;
295 };
296
xs_net(struct xfrm_state * x)297 static inline struct net *xs_net(struct xfrm_state *x)
298 {
299 return read_pnet(&x->xs_net);
300 }
301
302 /* xflags - make enum if more show up */
303 #define XFRM_TIME_DEFER 1
304 #define XFRM_SOFT_EXPIRE 2
305
306 enum {
307 XFRM_STATE_VOID,
308 XFRM_STATE_ACQ,
309 XFRM_STATE_VALID,
310 XFRM_STATE_ERROR,
311 XFRM_STATE_EXPIRED,
312 XFRM_STATE_DEAD
313 };
314
315 /* callback structure passed from either netlink or pfkey */
316 struct km_event {
317 union {
318 u32 hard;
319 u32 proto;
320 u32 byid;
321 u32 aevent;
322 u32 type;
323 } data;
324
325 u32 seq;
326 u32 portid;
327 u32 event;
328 struct net *net;
329 };
330
331 struct xfrm_if_decode_session_result {
332 struct net *net;
333 u32 if_id;
334 };
335
336 struct xfrm_if_cb {
337 bool (*decode_session)(struct sk_buff *skb,
338 unsigned short family,
339 struct xfrm_if_decode_session_result *res);
340 };
341
342 void xfrm_if_register_cb(const struct xfrm_if_cb *ifcb);
343 void xfrm_if_unregister_cb(void);
344
345 struct net_device;
346 struct xfrm_type;
347 struct xfrm_dst;
348 struct xfrm_policy_afinfo {
349 struct dst_ops *dst_ops;
350 struct dst_entry *(*dst_lookup)(struct net *net,
351 int tos, int oif,
352 const xfrm_address_t *saddr,
353 const xfrm_address_t *daddr,
354 u32 mark);
355 int (*get_saddr)(struct net *net, int oif,
356 xfrm_address_t *saddr,
357 xfrm_address_t *daddr,
358 u32 mark);
359 int (*fill_dst)(struct xfrm_dst *xdst,
360 struct net_device *dev,
361 const struct flowi *fl);
362 struct dst_entry *(*blackhole_route)(struct net *net, struct dst_entry *orig);
363 };
364
365 int xfrm_policy_register_afinfo(const struct xfrm_policy_afinfo *afinfo, int family);
366 void xfrm_policy_unregister_afinfo(const struct xfrm_policy_afinfo *afinfo);
367 void km_policy_notify(struct xfrm_policy *xp, int dir,
368 const struct km_event *c);
369 void km_state_notify(struct xfrm_state *x, const struct km_event *c);
370
371 struct xfrm_tmpl;
372 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t,
373 struct xfrm_policy *pol);
374 void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
375 int __xfrm_state_delete(struct xfrm_state *x);
376
377 struct xfrm_state_afinfo {
378 u8 family;
379 u8 proto;
380
381 const struct xfrm_type_offload *type_offload_esp;
382
383 const struct xfrm_type *type_esp;
384 const struct xfrm_type *type_ipip;
385 const struct xfrm_type *type_ipip6;
386 const struct xfrm_type *type_comp;
387 const struct xfrm_type *type_ah;
388 const struct xfrm_type *type_routing;
389 const struct xfrm_type *type_dstopts;
390
391 int (*output)(struct net *net, struct sock *sk, struct sk_buff *skb);
392 int (*transport_finish)(struct sk_buff *skb,
393 int async);
394 void (*local_error)(struct sk_buff *skb, u32 mtu);
395 };
396
397 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
398 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
399 struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family);
400 struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family);
401
402 struct xfrm_input_afinfo {
403 u8 family;
404 bool is_ipip;
405 int (*callback)(struct sk_buff *skb, u8 protocol,
406 int err);
407 };
408
409 int xfrm_input_register_afinfo(const struct xfrm_input_afinfo *afinfo);
410 int xfrm_input_unregister_afinfo(const struct xfrm_input_afinfo *afinfo);
411
412 void xfrm_flush_gc(void);
413 void xfrm_state_delete_tunnel(struct xfrm_state *x);
414
415 struct xfrm_type {
416 struct module *owner;
417 u8 proto;
418 u8 flags;
419 #define XFRM_TYPE_NON_FRAGMENT 1
420 #define XFRM_TYPE_REPLAY_PROT 2
421 #define XFRM_TYPE_LOCAL_COADDR 4
422 #define XFRM_TYPE_REMOTE_COADDR 8
423
424 int (*init_state)(struct xfrm_state *x,
425 struct netlink_ext_ack *extack);
426 void (*destructor)(struct xfrm_state *);
427 int (*input)(struct xfrm_state *, struct sk_buff *skb);
428 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
429 int (*reject)(struct xfrm_state *, struct sk_buff *,
430 const struct flowi *);
431 };
432
433 int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
434 void xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
435
436 struct xfrm_type_offload {
437 struct module *owner;
438 u8 proto;
439 void (*encap)(struct xfrm_state *, struct sk_buff *pskb);
440 int (*input_tail)(struct xfrm_state *x, struct sk_buff *skb);
441 int (*xmit)(struct xfrm_state *, struct sk_buff *pskb, netdev_features_t features);
442 };
443
444 int xfrm_register_type_offload(const struct xfrm_type_offload *type, unsigned short family);
445 void xfrm_unregister_type_offload(const struct xfrm_type_offload *type, unsigned short family);
446
xfrm_af2proto(unsigned int family)447 static inline int xfrm_af2proto(unsigned int family)
448 {
449 switch(family) {
450 case AF_INET:
451 return IPPROTO_IPIP;
452 case AF_INET6:
453 return IPPROTO_IPV6;
454 default:
455 return 0;
456 }
457 }
458
xfrm_ip2inner_mode(struct xfrm_state * x,int ipproto)459 static inline const struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
460 {
461 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
462 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
463 return &x->inner_mode;
464 else
465 return &x->inner_mode_iaf;
466 }
467
468 struct xfrm_tmpl {
469 /* id in template is interpreted as:
470 * daddr - destination of tunnel, may be zero for transport mode.
471 * spi - zero to acquire spi. Not zero if spi is static, then
472 * daddr must be fixed too.
473 * proto - AH/ESP/IPCOMP
474 */
475 struct xfrm_id id;
476
477 /* Source address of tunnel. Ignored, if it is not a tunnel. */
478 xfrm_address_t saddr;
479
480 unsigned short encap_family;
481
482 u32 reqid;
483
484 /* Mode: transport, tunnel etc. */
485 u8 mode;
486
487 /* Sharing mode: unique, this session only, this user only etc. */
488 u8 share;
489
490 /* May skip this transfomration if no SA is found */
491 u8 optional;
492
493 /* Skip aalgos/ealgos/calgos checks. */
494 u8 allalgs;
495
496 /* Bit mask of algos allowed for acquisition */
497 u32 aalgos;
498 u32 ealgos;
499 u32 calgos;
500 };
501
502 #define XFRM_MAX_DEPTH 6
503 #define XFRM_MAX_OFFLOAD_DEPTH 1
504
505 struct xfrm_policy_walk_entry {
506 struct list_head all;
507 u8 dead;
508 };
509
510 struct xfrm_policy_walk {
511 struct xfrm_policy_walk_entry walk;
512 u8 type;
513 u32 seq;
514 };
515
516 struct xfrm_policy_queue {
517 struct sk_buff_head hold_queue;
518 struct timer_list hold_timer;
519 unsigned long timeout;
520 };
521
522 struct xfrm_policy {
523 possible_net_t xp_net;
524 struct hlist_node bydst;
525 struct hlist_node byidx;
526
527 /* This lock only affects elements except for entry. */
528 rwlock_t lock;
529 refcount_t refcnt;
530 u32 pos;
531 struct timer_list timer;
532
533 atomic_t genid;
534 u32 priority;
535 u32 index;
536 u32 if_id;
537 struct xfrm_mark mark;
538 struct xfrm_selector selector;
539 struct xfrm_lifetime_cfg lft;
540 struct xfrm_lifetime_cur curlft;
541 struct xfrm_policy_walk_entry walk;
542 struct xfrm_policy_queue polq;
543 bool bydst_reinsert;
544 u8 type;
545 u8 action;
546 u8 flags;
547 u8 xfrm_nr;
548 u16 family;
549 struct xfrm_sec_ctx *security;
550 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
551 struct hlist_node bydst_inexact_list;
552 struct rcu_head rcu;
553
554 struct xfrm_dev_offload xdo;
555 };
556
xp_net(const struct xfrm_policy * xp)557 static inline struct net *xp_net(const struct xfrm_policy *xp)
558 {
559 return read_pnet(&xp->xp_net);
560 }
561
562 struct xfrm_kmaddress {
563 xfrm_address_t local;
564 xfrm_address_t remote;
565 u32 reserved;
566 u16 family;
567 };
568
569 struct xfrm_migrate {
570 xfrm_address_t old_daddr;
571 xfrm_address_t old_saddr;
572 xfrm_address_t new_daddr;
573 xfrm_address_t new_saddr;
574 u8 proto;
575 u8 mode;
576 u16 reserved;
577 u32 reqid;
578 u16 old_family;
579 u16 new_family;
580 };
581
582 #define XFRM_KM_TIMEOUT 30
583 /* what happened */
584 #define XFRM_REPLAY_UPDATE XFRM_AE_CR
585 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
586
587 /* default aevent timeout in units of 100ms */
588 #define XFRM_AE_ETIME 10
589 /* Async Event timer multiplier */
590 #define XFRM_AE_ETH_M 10
591 /* default seq threshold size */
592 #define XFRM_AE_SEQT_SIZE 2
593
594 struct xfrm_mgr {
595 struct list_head list;
596 int (*notify)(struct xfrm_state *x, const struct km_event *c);
597 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp);
598 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
599 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
600 int (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c);
601 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
602 int (*migrate)(const struct xfrm_selector *sel,
603 u8 dir, u8 type,
604 const struct xfrm_migrate *m,
605 int num_bundles,
606 const struct xfrm_kmaddress *k,
607 const struct xfrm_encap_tmpl *encap);
608 bool (*is_alive)(const struct km_event *c);
609 };
610
611 void xfrm_register_km(struct xfrm_mgr *km);
612 void xfrm_unregister_km(struct xfrm_mgr *km);
613
614 struct xfrm_tunnel_skb_cb {
615 union {
616 struct inet_skb_parm h4;
617 struct inet6_skb_parm h6;
618 } header;
619
620 union {
621 struct ip_tunnel *ip4;
622 struct ip6_tnl *ip6;
623 } tunnel;
624 };
625
626 #define XFRM_TUNNEL_SKB_CB(__skb) ((struct xfrm_tunnel_skb_cb *)&((__skb)->cb[0]))
627
628 /*
629 * This structure is used for the duration where packets are being
630 * transformed by IPsec. As soon as the packet leaves IPsec the
631 * area beyond the generic IP part may be overwritten.
632 */
633 struct xfrm_skb_cb {
634 struct xfrm_tunnel_skb_cb header;
635
636 /* Sequence number for replay protection. */
637 union {
638 struct {
639 __u32 low;
640 __u32 hi;
641 } output;
642 struct {
643 __be32 low;
644 __be32 hi;
645 } input;
646 } seq;
647 };
648
649 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
650
651 /*
652 * This structure is used by the afinfo prepare_input/prepare_output functions
653 * to transmit header information to the mode input/output functions.
654 */
655 struct xfrm_mode_skb_cb {
656 struct xfrm_tunnel_skb_cb header;
657
658 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
659 __be16 id;
660 __be16 frag_off;
661
662 /* IP header length (excluding options or extension headers). */
663 u8 ihl;
664
665 /* TOS for IPv4, class for IPv6. */
666 u8 tos;
667
668 /* TTL for IPv4, hop limitfor IPv6. */
669 u8 ttl;
670
671 /* Protocol for IPv4, NH for IPv6. */
672 u8 protocol;
673
674 /* Option length for IPv4, zero for IPv6. */
675 u8 optlen;
676
677 /* Used by IPv6 only, zero for IPv4. */
678 u8 flow_lbl[3];
679 };
680
681 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
682
683 /*
684 * This structure is used by the input processing to locate the SPI and
685 * related information.
686 */
687 struct xfrm_spi_skb_cb {
688 struct xfrm_tunnel_skb_cb header;
689
690 unsigned int daddroff;
691 unsigned int family;
692 __be32 seq;
693 };
694
695 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
696
697 #ifdef CONFIG_AUDITSYSCALL
xfrm_audit_start(const char * op)698 static inline struct audit_buffer *xfrm_audit_start(const char *op)
699 {
700 struct audit_buffer *audit_buf = NULL;
701
702 if (audit_enabled == AUDIT_OFF)
703 return NULL;
704 audit_buf = audit_log_start(audit_context(), GFP_ATOMIC,
705 AUDIT_MAC_IPSEC_EVENT);
706 if (audit_buf == NULL)
707 return NULL;
708 audit_log_format(audit_buf, "op=%s", op);
709 return audit_buf;
710 }
711
xfrm_audit_helper_usrinfo(bool task_valid,struct audit_buffer * audit_buf)712 static inline void xfrm_audit_helper_usrinfo(bool task_valid,
713 struct audit_buffer *audit_buf)
714 {
715 const unsigned int auid = from_kuid(&init_user_ns, task_valid ?
716 audit_get_loginuid(current) :
717 INVALID_UID);
718 const unsigned int ses = task_valid ? audit_get_sessionid(current) :
719 AUDIT_SID_UNSET;
720
721 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
722 audit_log_task_context(audit_buf);
723 }
724
725 void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid);
726 void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
727 bool task_valid);
728 void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid);
729 void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid);
730 void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
731 struct sk_buff *skb);
732 void xfrm_audit_state_replay(struct xfrm_state *x, struct sk_buff *skb,
733 __be32 net_seq);
734 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
735 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, __be32 net_spi,
736 __be32 net_seq);
737 void xfrm_audit_state_icvfail(struct xfrm_state *x, struct sk_buff *skb,
738 u8 proto);
739 #else
740
xfrm_audit_policy_add(struct xfrm_policy * xp,int result,bool task_valid)741 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
742 bool task_valid)
743 {
744 }
745
xfrm_audit_policy_delete(struct xfrm_policy * xp,int result,bool task_valid)746 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
747 bool task_valid)
748 {
749 }
750
xfrm_audit_state_add(struct xfrm_state * x,int result,bool task_valid)751 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
752 bool task_valid)
753 {
754 }
755
xfrm_audit_state_delete(struct xfrm_state * x,int result,bool task_valid)756 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
757 bool task_valid)
758 {
759 }
760
xfrm_audit_state_replay_overflow(struct xfrm_state * x,struct sk_buff * skb)761 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
762 struct sk_buff *skb)
763 {
764 }
765
xfrm_audit_state_replay(struct xfrm_state * x,struct sk_buff * skb,__be32 net_seq)766 static inline void xfrm_audit_state_replay(struct xfrm_state *x,
767 struct sk_buff *skb, __be32 net_seq)
768 {
769 }
770
xfrm_audit_state_notfound_simple(struct sk_buff * skb,u16 family)771 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
772 u16 family)
773 {
774 }
775
xfrm_audit_state_notfound(struct sk_buff * skb,u16 family,__be32 net_spi,__be32 net_seq)776 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
777 __be32 net_spi, __be32 net_seq)
778 {
779 }
780
xfrm_audit_state_icvfail(struct xfrm_state * x,struct sk_buff * skb,u8 proto)781 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
782 struct sk_buff *skb, u8 proto)
783 {
784 }
785 #endif /* CONFIG_AUDITSYSCALL */
786
xfrm_pol_hold(struct xfrm_policy * policy)787 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
788 {
789 if (likely(policy != NULL))
790 refcount_inc(&policy->refcnt);
791 }
792
793 void xfrm_policy_destroy(struct xfrm_policy *policy);
794
xfrm_pol_put(struct xfrm_policy * policy)795 static inline void xfrm_pol_put(struct xfrm_policy *policy)
796 {
797 if (refcount_dec_and_test(&policy->refcnt))
798 xfrm_policy_destroy(policy);
799 }
800
xfrm_pols_put(struct xfrm_policy ** pols,int npols)801 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
802 {
803 int i;
804 for (i = npols - 1; i >= 0; --i)
805 xfrm_pol_put(pols[i]);
806 }
807
808 void __xfrm_state_destroy(struct xfrm_state *, bool);
809
__xfrm_state_put(struct xfrm_state * x)810 static inline void __xfrm_state_put(struct xfrm_state *x)
811 {
812 refcount_dec(&x->refcnt);
813 }
814
xfrm_state_put(struct xfrm_state * x)815 static inline void xfrm_state_put(struct xfrm_state *x)
816 {
817 if (refcount_dec_and_test(&x->refcnt))
818 __xfrm_state_destroy(x, false);
819 }
820
xfrm_state_put_sync(struct xfrm_state * x)821 static inline void xfrm_state_put_sync(struct xfrm_state *x)
822 {
823 if (refcount_dec_and_test(&x->refcnt))
824 __xfrm_state_destroy(x, true);
825 }
826
xfrm_state_hold(struct xfrm_state * x)827 static inline void xfrm_state_hold(struct xfrm_state *x)
828 {
829 refcount_inc(&x->refcnt);
830 }
831
addr_match(const void * token1,const void * token2,unsigned int prefixlen)832 static inline bool addr_match(const void *token1, const void *token2,
833 unsigned int prefixlen)
834 {
835 const __be32 *a1 = token1;
836 const __be32 *a2 = token2;
837 unsigned int pdw;
838 unsigned int pbi;
839
840 pdw = prefixlen >> 5; /* num of whole u32 in prefix */
841 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
842
843 if (pdw)
844 if (memcmp(a1, a2, pdw << 2))
845 return false;
846
847 if (pbi) {
848 __be32 mask;
849
850 mask = htonl((0xffffffff) << (32 - pbi));
851
852 if ((a1[pdw] ^ a2[pdw]) & mask)
853 return false;
854 }
855
856 return true;
857 }
858
addr4_match(__be32 a1,__be32 a2,u8 prefixlen)859 static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen)
860 {
861 /* C99 6.5.7 (3): u32 << 32 is undefined behaviour */
862 if (sizeof(long) == 4 && prefixlen == 0)
863 return true;
864 return !((a1 ^ a2) & htonl(~0UL << (32 - prefixlen)));
865 }
866
867 static __inline__
xfrm_flowi_sport(const struct flowi * fl,const union flowi_uli * uli)868 __be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli)
869 {
870 __be16 port;
871 switch(fl->flowi_proto) {
872 case IPPROTO_TCP:
873 case IPPROTO_UDP:
874 case IPPROTO_UDPLITE:
875 case IPPROTO_SCTP:
876 port = uli->ports.sport;
877 break;
878 case IPPROTO_ICMP:
879 case IPPROTO_ICMPV6:
880 port = htons(uli->icmpt.type);
881 break;
882 case IPPROTO_MH:
883 port = htons(uli->mht.type);
884 break;
885 case IPPROTO_GRE:
886 port = htons(ntohl(uli->gre_key) >> 16);
887 break;
888 default:
889 port = 0; /*XXX*/
890 }
891 return port;
892 }
893
894 static __inline__
xfrm_flowi_dport(const struct flowi * fl,const union flowi_uli * uli)895 __be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli)
896 {
897 __be16 port;
898 switch(fl->flowi_proto) {
899 case IPPROTO_TCP:
900 case IPPROTO_UDP:
901 case IPPROTO_UDPLITE:
902 case IPPROTO_SCTP:
903 port = uli->ports.dport;
904 break;
905 case IPPROTO_ICMP:
906 case IPPROTO_ICMPV6:
907 port = htons(uli->icmpt.code);
908 break;
909 case IPPROTO_GRE:
910 port = htons(ntohl(uli->gre_key) & 0xffff);
911 break;
912 default:
913 port = 0; /*XXX*/
914 }
915 return port;
916 }
917
918 bool xfrm_selector_match(const struct xfrm_selector *sel,
919 const struct flowi *fl, unsigned short family);
920
921 #ifdef CONFIG_SECURITY_NETWORK_XFRM
922 /* If neither has a context --> match
923 * Otherwise, both must have a context and the sids, doi, alg must match
924 */
xfrm_sec_ctx_match(struct xfrm_sec_ctx * s1,struct xfrm_sec_ctx * s2)925 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
926 {
927 return ((!s1 && !s2) ||
928 (s1 && s2 &&
929 (s1->ctx_sid == s2->ctx_sid) &&
930 (s1->ctx_doi == s2->ctx_doi) &&
931 (s1->ctx_alg == s2->ctx_alg)));
932 }
933 #else
xfrm_sec_ctx_match(struct xfrm_sec_ctx * s1,struct xfrm_sec_ctx * s2)934 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
935 {
936 return true;
937 }
938 #endif
939
940 /* A struct encoding bundle of transformations to apply to some set of flow.
941 *
942 * xdst->child points to the next element of bundle.
943 * dst->xfrm points to an instanse of transformer.
944 *
945 * Due to unfortunate limitations of current routing cache, which we
946 * have no time to fix, it mirrors struct rtable and bound to the same
947 * routing key, including saddr,daddr. However, we can have many of
948 * bundles differing by session id. All the bundles grow from a parent
949 * policy rule.
950 */
951 struct xfrm_dst {
952 union {
953 struct dst_entry dst;
954 struct rtable rt;
955 struct rt6_info rt6;
956 } u;
957 struct dst_entry *route;
958 struct dst_entry *child;
959 struct dst_entry *path;
960 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
961 int num_pols, num_xfrms;
962 u32 xfrm_genid;
963 u32 policy_genid;
964 u32 route_mtu_cached;
965 u32 child_mtu_cached;
966 u32 route_cookie;
967 u32 path_cookie;
968 };
969
xfrm_dst_path(const struct dst_entry * dst)970 static inline struct dst_entry *xfrm_dst_path(const struct dst_entry *dst)
971 {
972 #ifdef CONFIG_XFRM
973 if (dst->xfrm || (dst->flags & DST_XFRM_QUEUE)) {
974 const struct xfrm_dst *xdst = (const struct xfrm_dst *) dst;
975
976 return xdst->path;
977 }
978 #endif
979 return (struct dst_entry *) dst;
980 }
981
xfrm_dst_child(const struct dst_entry * dst)982 static inline struct dst_entry *xfrm_dst_child(const struct dst_entry *dst)
983 {
984 #ifdef CONFIG_XFRM
985 if (dst->xfrm || (dst->flags & DST_XFRM_QUEUE)) {
986 struct xfrm_dst *xdst = (struct xfrm_dst *) dst;
987 return xdst->child;
988 }
989 #endif
990 return NULL;
991 }
992
993 #ifdef CONFIG_XFRM
xfrm_dst_set_child(struct xfrm_dst * xdst,struct dst_entry * child)994 static inline void xfrm_dst_set_child(struct xfrm_dst *xdst, struct dst_entry *child)
995 {
996 xdst->child = child;
997 }
998
xfrm_dst_destroy(struct xfrm_dst * xdst)999 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
1000 {
1001 xfrm_pols_put(xdst->pols, xdst->num_pols);
1002 dst_release(xdst->route);
1003 if (likely(xdst->u.dst.xfrm))
1004 xfrm_state_put(xdst->u.dst.xfrm);
1005 }
1006 #endif
1007
1008 void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
1009
1010 struct xfrm_if_parms {
1011 int link; /* ifindex of underlying L2 interface */
1012 u32 if_id; /* interface identifyer */
1013 bool collect_md;
1014 };
1015
1016 struct xfrm_if {
1017 struct xfrm_if __rcu *next; /* next interface in list */
1018 struct net_device *dev; /* virtual device associated with interface */
1019 struct net *net; /* netns for packet i/o */
1020 struct xfrm_if_parms p; /* interface parms */
1021
1022 struct gro_cells gro_cells;
1023 };
1024
1025 struct xfrm_offload {
1026 /* Output sequence number for replay protection on offloading. */
1027 struct {
1028 __u32 low;
1029 __u32 hi;
1030 } seq;
1031
1032 __u32 flags;
1033 #define SA_DELETE_REQ 1
1034 #define CRYPTO_DONE 2
1035 #define CRYPTO_NEXT_DONE 4
1036 #define CRYPTO_FALLBACK 8
1037 #define XFRM_GSO_SEGMENT 16
1038 #define XFRM_GRO 32
1039 /* 64 is free */
1040 #define XFRM_DEV_RESUME 128
1041 #define XFRM_XMIT 256
1042
1043 __u32 status;
1044 #define CRYPTO_SUCCESS 1
1045 #define CRYPTO_GENERIC_ERROR 2
1046 #define CRYPTO_TRANSPORT_AH_AUTH_FAILED 4
1047 #define CRYPTO_TRANSPORT_ESP_AUTH_FAILED 8
1048 #define CRYPTO_TUNNEL_AH_AUTH_FAILED 16
1049 #define CRYPTO_TUNNEL_ESP_AUTH_FAILED 32
1050 #define CRYPTO_INVALID_PACKET_SYNTAX 64
1051 #define CRYPTO_INVALID_PROTOCOL 128
1052
1053 /* Used to keep whole l2 header for transport mode GRO */
1054 __u32 orig_mac_len;
1055
1056 __u8 proto;
1057 __u8 inner_ipproto;
1058 };
1059
1060 struct sec_path {
1061 int len;
1062 int olen;
1063 int verified_cnt;
1064
1065 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
1066 struct xfrm_offload ovec[XFRM_MAX_OFFLOAD_DEPTH];
1067 };
1068
1069 struct sec_path *secpath_set(struct sk_buff *skb);
1070
1071 static inline void
secpath_reset(struct sk_buff * skb)1072 secpath_reset(struct sk_buff *skb)
1073 {
1074 #ifdef CONFIG_XFRM
1075 skb_ext_del(skb, SKB_EXT_SEC_PATH);
1076 #endif
1077 }
1078
1079 static inline int
xfrm_addr_any(const xfrm_address_t * addr,unsigned short family)1080 xfrm_addr_any(const xfrm_address_t *addr, unsigned short family)
1081 {
1082 switch (family) {
1083 case AF_INET:
1084 return addr->a4 == 0;
1085 case AF_INET6:
1086 return ipv6_addr_any(&addr->in6);
1087 }
1088 return 0;
1089 }
1090
1091 static inline int
__xfrm4_state_addr_cmp(const struct xfrm_tmpl * tmpl,const struct xfrm_state * x)1092 __xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1093 {
1094 return (tmpl->saddr.a4 &&
1095 tmpl->saddr.a4 != x->props.saddr.a4);
1096 }
1097
1098 static inline int
__xfrm6_state_addr_cmp(const struct xfrm_tmpl * tmpl,const struct xfrm_state * x)1099 __xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1100 {
1101 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
1102 !ipv6_addr_equal((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
1103 }
1104
1105 static inline int
xfrm_state_addr_cmp(const struct xfrm_tmpl * tmpl,const struct xfrm_state * x,unsigned short family)1106 xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family)
1107 {
1108 switch (family) {
1109 case AF_INET:
1110 return __xfrm4_state_addr_cmp(tmpl, x);
1111 case AF_INET6:
1112 return __xfrm6_state_addr_cmp(tmpl, x);
1113 }
1114 return !0;
1115 }
1116
1117 #ifdef CONFIG_XFRM
xfrm_input_state(struct sk_buff * skb)1118 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1119 {
1120 struct sec_path *sp = skb_sec_path(skb);
1121
1122 return sp->xvec[sp->len - 1];
1123 }
1124 #endif
1125
xfrm_offload(struct sk_buff * skb)1126 static inline struct xfrm_offload *xfrm_offload(struct sk_buff *skb)
1127 {
1128 #ifdef CONFIG_XFRM
1129 struct sec_path *sp = skb_sec_path(skb);
1130
1131 if (!sp || !sp->olen || sp->len != sp->olen)
1132 return NULL;
1133
1134 return &sp->ovec[sp->olen - 1];
1135 #else
1136 return NULL;
1137 #endif
1138 }
1139
1140 #ifdef CONFIG_XFRM
1141 int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb,
1142 unsigned short family);
1143
__xfrm_check_nopolicy(struct net * net,struct sk_buff * skb,int dir)1144 static inline bool __xfrm_check_nopolicy(struct net *net, struct sk_buff *skb,
1145 int dir)
1146 {
1147 if (!net->xfrm.policy_count[dir] && !secpath_exists(skb))
1148 return net->xfrm.policy_default[dir] == XFRM_USERPOLICY_ACCEPT;
1149
1150 return false;
1151 }
1152
__xfrm_check_dev_nopolicy(struct sk_buff * skb,int dir,unsigned short family)1153 static inline bool __xfrm_check_dev_nopolicy(struct sk_buff *skb,
1154 int dir, unsigned short family)
1155 {
1156 if (dir != XFRM_POLICY_OUT && family == AF_INET) {
1157 /* same dst may be used for traffic originating from
1158 * devices with different policy settings.
1159 */
1160 return IPCB(skb)->flags & IPSKB_NOPOLICY;
1161 }
1162 return skb_dst(skb) && (skb_dst(skb)->flags & DST_NOPOLICY);
1163 }
1164
__xfrm_policy_check2(struct sock * sk,int dir,struct sk_buff * skb,unsigned int family,int reverse)1165 static inline int __xfrm_policy_check2(struct sock *sk, int dir,
1166 struct sk_buff *skb,
1167 unsigned int family, int reverse)
1168 {
1169 struct net *net = dev_net(skb->dev);
1170 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
1171 struct xfrm_offload *xo = xfrm_offload(skb);
1172 struct xfrm_state *x;
1173
1174 if (sk && sk->sk_policy[XFRM_POLICY_IN])
1175 return __xfrm_policy_check(sk, ndir, skb, family);
1176
1177 if (xo) {
1178 x = xfrm_input_state(skb);
1179 if (x->xso.type == XFRM_DEV_OFFLOAD_PACKET)
1180 return (xo->flags & CRYPTO_DONE) &&
1181 (xo->status & CRYPTO_SUCCESS);
1182 }
1183
1184 return __xfrm_check_nopolicy(net, skb, dir) ||
1185 __xfrm_check_dev_nopolicy(skb, dir, family) ||
1186 __xfrm_policy_check(sk, ndir, skb, family);
1187 }
1188
xfrm_policy_check(struct sock * sk,int dir,struct sk_buff * skb,unsigned short family)1189 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1190 {
1191 return __xfrm_policy_check2(sk, dir, skb, family, 0);
1192 }
1193
xfrm4_policy_check(struct sock * sk,int dir,struct sk_buff * skb)1194 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1195 {
1196 return xfrm_policy_check(sk, dir, skb, AF_INET);
1197 }
1198
xfrm6_policy_check(struct sock * sk,int dir,struct sk_buff * skb)1199 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1200 {
1201 return xfrm_policy_check(sk, dir, skb, AF_INET6);
1202 }
1203
xfrm4_policy_check_reverse(struct sock * sk,int dir,struct sk_buff * skb)1204 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1205 struct sk_buff *skb)
1206 {
1207 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1208 }
1209
xfrm6_policy_check_reverse(struct sock * sk,int dir,struct sk_buff * skb)1210 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1211 struct sk_buff *skb)
1212 {
1213 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1214 }
1215
1216 int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1217 unsigned int family, int reverse);
1218
xfrm_decode_session(struct sk_buff * skb,struct flowi * fl,unsigned int family)1219 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1220 unsigned int family)
1221 {
1222 return __xfrm_decode_session(skb, fl, family, 0);
1223 }
1224
xfrm_decode_session_reverse(struct sk_buff * skb,struct flowi * fl,unsigned int family)1225 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1226 struct flowi *fl,
1227 unsigned int family)
1228 {
1229 return __xfrm_decode_session(skb, fl, family, 1);
1230 }
1231
1232 int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1233
xfrm_route_forward(struct sk_buff * skb,unsigned short family)1234 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1235 {
1236 struct net *net = dev_net(skb->dev);
1237
1238 if (!net->xfrm.policy_count[XFRM_POLICY_OUT] &&
1239 net->xfrm.policy_default[XFRM_POLICY_OUT] == XFRM_USERPOLICY_ACCEPT)
1240 return true;
1241
1242 return (skb_dst(skb)->flags & DST_NOXFRM) ||
1243 __xfrm_route_forward(skb, family);
1244 }
1245
xfrm4_route_forward(struct sk_buff * skb)1246 static inline int xfrm4_route_forward(struct sk_buff *skb)
1247 {
1248 return xfrm_route_forward(skb, AF_INET);
1249 }
1250
xfrm6_route_forward(struct sk_buff * skb)1251 static inline int xfrm6_route_forward(struct sk_buff *skb)
1252 {
1253 return xfrm_route_forward(skb, AF_INET6);
1254 }
1255
1256 int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk);
1257
xfrm_sk_clone_policy(struct sock * sk,const struct sock * osk)1258 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk)
1259 {
1260 if (!sk_fullsock(osk))
1261 return 0;
1262 sk->sk_policy[0] = NULL;
1263 sk->sk_policy[1] = NULL;
1264 if (unlikely(osk->sk_policy[0] || osk->sk_policy[1]))
1265 return __xfrm_sk_clone_policy(sk, osk);
1266 return 0;
1267 }
1268
1269 int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1270
xfrm_sk_free_policy(struct sock * sk)1271 static inline void xfrm_sk_free_policy(struct sock *sk)
1272 {
1273 struct xfrm_policy *pol;
1274
1275 pol = rcu_dereference_protected(sk->sk_policy[0], 1);
1276 if (unlikely(pol != NULL)) {
1277 xfrm_policy_delete(pol, XFRM_POLICY_MAX);
1278 sk->sk_policy[0] = NULL;
1279 }
1280 pol = rcu_dereference_protected(sk->sk_policy[1], 1);
1281 if (unlikely(pol != NULL)) {
1282 xfrm_policy_delete(pol, XFRM_POLICY_MAX+1);
1283 sk->sk_policy[1] = NULL;
1284 }
1285 }
1286
1287 #else
1288
xfrm_sk_free_policy(struct sock * sk)1289 static inline void xfrm_sk_free_policy(struct sock *sk) {}
xfrm_sk_clone_policy(struct sock * sk,const struct sock * osk)1290 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) { return 0; }
xfrm6_route_forward(struct sk_buff * skb)1291 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
xfrm4_route_forward(struct sk_buff * skb)1292 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
xfrm6_policy_check(struct sock * sk,int dir,struct sk_buff * skb)1293 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1294 {
1295 return 1;
1296 }
xfrm4_policy_check(struct sock * sk,int dir,struct sk_buff * skb)1297 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1298 {
1299 return 1;
1300 }
xfrm_policy_check(struct sock * sk,int dir,struct sk_buff * skb,unsigned short family)1301 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1302 {
1303 return 1;
1304 }
xfrm_decode_session_reverse(struct sk_buff * skb,struct flowi * fl,unsigned int family)1305 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1306 struct flowi *fl,
1307 unsigned int family)
1308 {
1309 return -ENOSYS;
1310 }
xfrm4_policy_check_reverse(struct sock * sk,int dir,struct sk_buff * skb)1311 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1312 struct sk_buff *skb)
1313 {
1314 return 1;
1315 }
xfrm6_policy_check_reverse(struct sock * sk,int dir,struct sk_buff * skb)1316 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1317 struct sk_buff *skb)
1318 {
1319 return 1;
1320 }
1321 #endif
1322
1323 static __inline__
xfrm_flowi_daddr(const struct flowi * fl,unsigned short family)1324 xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family)
1325 {
1326 switch (family){
1327 case AF_INET:
1328 return (xfrm_address_t *)&fl->u.ip4.daddr;
1329 case AF_INET6:
1330 return (xfrm_address_t *)&fl->u.ip6.daddr;
1331 }
1332 return NULL;
1333 }
1334
1335 static __inline__
xfrm_flowi_saddr(const struct flowi * fl,unsigned short family)1336 xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family)
1337 {
1338 switch (family){
1339 case AF_INET:
1340 return (xfrm_address_t *)&fl->u.ip4.saddr;
1341 case AF_INET6:
1342 return (xfrm_address_t *)&fl->u.ip6.saddr;
1343 }
1344 return NULL;
1345 }
1346
1347 static __inline__
xfrm_flowi_addr_get(const struct flowi * fl,xfrm_address_t * saddr,xfrm_address_t * daddr,unsigned short family)1348 void xfrm_flowi_addr_get(const struct flowi *fl,
1349 xfrm_address_t *saddr, xfrm_address_t *daddr,
1350 unsigned short family)
1351 {
1352 switch(family) {
1353 case AF_INET:
1354 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4));
1355 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4));
1356 break;
1357 case AF_INET6:
1358 saddr->in6 = fl->u.ip6.saddr;
1359 daddr->in6 = fl->u.ip6.daddr;
1360 break;
1361 }
1362 }
1363
1364 static __inline__ int
__xfrm4_state_addr_check(const struct xfrm_state * x,const xfrm_address_t * daddr,const xfrm_address_t * saddr)1365 __xfrm4_state_addr_check(const struct xfrm_state *x,
1366 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1367 {
1368 if (daddr->a4 == x->id.daddr.a4 &&
1369 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1370 return 1;
1371 return 0;
1372 }
1373
1374 static __inline__ int
__xfrm6_state_addr_check(const struct xfrm_state * x,const xfrm_address_t * daddr,const xfrm_address_t * saddr)1375 __xfrm6_state_addr_check(const struct xfrm_state *x,
1376 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1377 {
1378 if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1379 (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) ||
1380 ipv6_addr_any((struct in6_addr *)saddr) ||
1381 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1382 return 1;
1383 return 0;
1384 }
1385
1386 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)1387 xfrm_state_addr_check(const struct xfrm_state *x,
1388 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1389 unsigned short family)
1390 {
1391 switch (family) {
1392 case AF_INET:
1393 return __xfrm4_state_addr_check(x, daddr, saddr);
1394 case AF_INET6:
1395 return __xfrm6_state_addr_check(x, daddr, saddr);
1396 }
1397 return 0;
1398 }
1399
1400 static __inline__ int
xfrm_state_addr_flow_check(const struct xfrm_state * x,const struct flowi * fl,unsigned short family)1401 xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl,
1402 unsigned short family)
1403 {
1404 switch (family) {
1405 case AF_INET:
1406 return __xfrm4_state_addr_check(x,
1407 (const xfrm_address_t *)&fl->u.ip4.daddr,
1408 (const xfrm_address_t *)&fl->u.ip4.saddr);
1409 case AF_INET6:
1410 return __xfrm6_state_addr_check(x,
1411 (const xfrm_address_t *)&fl->u.ip6.daddr,
1412 (const xfrm_address_t *)&fl->u.ip6.saddr);
1413 }
1414 return 0;
1415 }
1416
xfrm_state_kern(const struct xfrm_state * x)1417 static inline int xfrm_state_kern(const struct xfrm_state *x)
1418 {
1419 return atomic_read(&x->tunnel_users);
1420 }
1421
xfrm_id_proto_valid(u8 proto)1422 static inline bool xfrm_id_proto_valid(u8 proto)
1423 {
1424 switch (proto) {
1425 case IPPROTO_AH:
1426 case IPPROTO_ESP:
1427 case IPPROTO_COMP:
1428 #if IS_ENABLED(CONFIG_IPV6)
1429 case IPPROTO_ROUTING:
1430 case IPPROTO_DSTOPTS:
1431 #endif
1432 return true;
1433 default:
1434 return false;
1435 }
1436 }
1437
1438 /* IPSEC_PROTO_ANY only matches 3 IPsec protocols, 0 could match all. */
xfrm_id_proto_match(u8 proto,u8 userproto)1439 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1440 {
1441 return (!userproto || proto == userproto ||
1442 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1443 proto == IPPROTO_ESP ||
1444 proto == IPPROTO_COMP)));
1445 }
1446
1447 /*
1448 * xfrm algorithm information
1449 */
1450 struct xfrm_algo_aead_info {
1451 char *geniv;
1452 u16 icv_truncbits;
1453 };
1454
1455 struct xfrm_algo_auth_info {
1456 u16 icv_truncbits;
1457 u16 icv_fullbits;
1458 };
1459
1460 struct xfrm_algo_encr_info {
1461 char *geniv;
1462 u16 blockbits;
1463 u16 defkeybits;
1464 };
1465
1466 struct xfrm_algo_comp_info {
1467 u16 threshold;
1468 };
1469
1470 struct xfrm_algo_desc {
1471 char *name;
1472 char *compat;
1473 u8 available:1;
1474 u8 pfkey_supported:1;
1475 union {
1476 struct xfrm_algo_aead_info aead;
1477 struct xfrm_algo_auth_info auth;
1478 struct xfrm_algo_encr_info encr;
1479 struct xfrm_algo_comp_info comp;
1480 } uinfo;
1481 struct sadb_alg desc;
1482 };
1483
1484 /* XFRM protocol handlers. */
1485 struct xfrm4_protocol {
1486 int (*handler)(struct sk_buff *skb);
1487 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1488 int encap_type);
1489 int (*cb_handler)(struct sk_buff *skb, int err);
1490 int (*err_handler)(struct sk_buff *skb, u32 info);
1491
1492 struct xfrm4_protocol __rcu *next;
1493 int priority;
1494 };
1495
1496 struct xfrm6_protocol {
1497 int (*handler)(struct sk_buff *skb);
1498 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1499 int encap_type);
1500 int (*cb_handler)(struct sk_buff *skb, int err);
1501 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1502 u8 type, u8 code, int offset, __be32 info);
1503
1504 struct xfrm6_protocol __rcu *next;
1505 int priority;
1506 };
1507
1508 /* XFRM tunnel handlers. */
1509 struct xfrm_tunnel {
1510 int (*handler)(struct sk_buff *skb);
1511 int (*cb_handler)(struct sk_buff *skb, int err);
1512 int (*err_handler)(struct sk_buff *skb, u32 info);
1513
1514 struct xfrm_tunnel __rcu *next;
1515 int priority;
1516 };
1517
1518 struct xfrm6_tunnel {
1519 int (*handler)(struct sk_buff *skb);
1520 int (*cb_handler)(struct sk_buff *skb, int err);
1521 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1522 u8 type, u8 code, int offset, __be32 info);
1523 struct xfrm6_tunnel __rcu *next;
1524 int priority;
1525 };
1526
1527 void xfrm_init(void);
1528 void xfrm4_init(void);
1529 int xfrm_state_init(struct net *net);
1530 void xfrm_state_fini(struct net *net);
1531 void xfrm4_state_init(void);
1532 void xfrm4_protocol_init(void);
1533 #ifdef CONFIG_XFRM
1534 int xfrm6_init(void);
1535 void xfrm6_fini(void);
1536 int xfrm6_state_init(void);
1537 void xfrm6_state_fini(void);
1538 int xfrm6_protocol_init(void);
1539 void xfrm6_protocol_fini(void);
1540 #else
xfrm6_init(void)1541 static inline int xfrm6_init(void)
1542 {
1543 return 0;
1544 }
xfrm6_fini(void)1545 static inline void xfrm6_fini(void)
1546 {
1547 ;
1548 }
1549 #endif
1550
1551 #ifdef CONFIG_XFRM_STATISTICS
1552 int xfrm_proc_init(struct net *net);
1553 void xfrm_proc_fini(struct net *net);
1554 #endif
1555
1556 int xfrm_sysctl_init(struct net *net);
1557 #ifdef CONFIG_SYSCTL
1558 void xfrm_sysctl_fini(struct net *net);
1559 #else
xfrm_sysctl_fini(struct net * net)1560 static inline void xfrm_sysctl_fini(struct net *net)
1561 {
1562 }
1563 #endif
1564
1565 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
1566 struct xfrm_address_filter *filter);
1567 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1568 int (*func)(struct xfrm_state *, int, void*), void *);
1569 void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net);
1570 struct xfrm_state *xfrm_state_alloc(struct net *net);
1571 void xfrm_state_free(struct xfrm_state *x);
1572 struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr,
1573 const xfrm_address_t *saddr,
1574 const struct flowi *fl,
1575 struct xfrm_tmpl *tmpl,
1576 struct xfrm_policy *pol, int *err,
1577 unsigned short family, u32 if_id);
1578 struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark, u32 if_id,
1579 xfrm_address_t *daddr,
1580 xfrm_address_t *saddr,
1581 unsigned short family,
1582 u8 mode, u8 proto, u32 reqid);
1583 struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
1584 unsigned short family);
1585 int xfrm_state_check_expire(struct xfrm_state *x);
1586 #ifdef CONFIG_XFRM_OFFLOAD
xfrm_dev_state_update_curlft(struct xfrm_state * x)1587 static inline void xfrm_dev_state_update_curlft(struct xfrm_state *x)
1588 {
1589 struct xfrm_dev_offload *xdo = &x->xso;
1590 struct net_device *dev = READ_ONCE(xdo->dev);
1591
1592 if (x->xso.type != XFRM_DEV_OFFLOAD_PACKET)
1593 return;
1594
1595 if (dev && dev->xfrmdev_ops &&
1596 dev->xfrmdev_ops->xdo_dev_state_update_curlft)
1597 dev->xfrmdev_ops->xdo_dev_state_update_curlft(x);
1598
1599 }
1600 #else
xfrm_dev_state_update_curlft(struct xfrm_state * x)1601 static inline void xfrm_dev_state_update_curlft(struct xfrm_state *x) {}
1602 #endif
1603 void xfrm_state_insert(struct xfrm_state *x);
1604 int xfrm_state_add(struct xfrm_state *x);
1605 int xfrm_state_update(struct xfrm_state *x);
1606 struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1607 const xfrm_address_t *daddr, __be32 spi,
1608 u8 proto, unsigned short family);
1609 struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1610 const xfrm_address_t *daddr,
1611 const xfrm_address_t *saddr,
1612 u8 proto,
1613 unsigned short family);
1614 #ifdef CONFIG_XFRM_SUB_POLICY
1615 void xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1616 unsigned short family);
1617 void xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1618 unsigned short family);
1619 #else
xfrm_tmpl_sort(struct xfrm_tmpl ** d,struct xfrm_tmpl ** s,int n,unsigned short family)1620 static inline void xfrm_tmpl_sort(struct xfrm_tmpl **d, struct xfrm_tmpl **s,
1621 int n, unsigned short family)
1622 {
1623 }
1624
xfrm_state_sort(struct xfrm_state ** d,struct xfrm_state ** s,int n,unsigned short family)1625 static inline void xfrm_state_sort(struct xfrm_state **d, struct xfrm_state **s,
1626 int n, unsigned short family)
1627 {
1628 }
1629 #endif
1630
1631 struct xfrmk_sadinfo {
1632 u32 sadhcnt; /* current hash bkts */
1633 u32 sadhmcnt; /* max allowed hash bkts */
1634 u32 sadcnt; /* current running count */
1635 };
1636
1637 struct xfrmk_spdinfo {
1638 u32 incnt;
1639 u32 outcnt;
1640 u32 fwdcnt;
1641 u32 inscnt;
1642 u32 outscnt;
1643 u32 fwdscnt;
1644 u32 spdhcnt;
1645 u32 spdhmcnt;
1646 };
1647
1648 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1649 int xfrm_state_delete(struct xfrm_state *x);
1650 int xfrm_state_flush(struct net *net, u8 proto, bool task_valid, bool sync);
1651 int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid);
1652 int xfrm_dev_policy_flush(struct net *net, struct net_device *dev,
1653 bool task_valid);
1654 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1655 void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1656 u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq);
1657 int xfrm_init_replay(struct xfrm_state *x, struct netlink_ext_ack *extack);
1658 u32 xfrm_state_mtu(struct xfrm_state *x, int mtu);
1659 int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload,
1660 struct netlink_ext_ack *extack);
1661 int xfrm_init_state(struct xfrm_state *x);
1662 int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type);
1663 int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1664 int xfrm_trans_queue_net(struct net *net, struct sk_buff *skb,
1665 int (*finish)(struct net *, struct sock *,
1666 struct sk_buff *));
1667 int xfrm_trans_queue(struct sk_buff *skb,
1668 int (*finish)(struct net *, struct sock *,
1669 struct sk_buff *));
1670 int xfrm_output_resume(struct sock *sk, struct sk_buff *skb, int err);
1671 int xfrm_output(struct sock *sk, struct sk_buff *skb);
1672
1673 #if IS_ENABLED(CONFIG_NET_PKTGEN)
1674 int pktgen_xfrm_outer_mode_output(struct xfrm_state *x, struct sk_buff *skb);
1675 #endif
1676
1677 void xfrm_local_error(struct sk_buff *skb, int mtu);
1678 int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1679 int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1680 int encap_type);
1681 int xfrm4_transport_finish(struct sk_buff *skb, int async);
1682 int xfrm4_rcv(struct sk_buff *skb);
1683
xfrm4_rcv_spi(struct sk_buff * skb,int nexthdr,__be32 spi)1684 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1685 {
1686 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
1687 XFRM_SPI_SKB_CB(skb)->family = AF_INET;
1688 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
1689 return xfrm_input(skb, nexthdr, spi, 0);
1690 }
1691
1692 int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1693 int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol);
1694 int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol);
1695 int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1696 int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1697 void xfrm4_local_error(struct sk_buff *skb, u32 mtu);
1698 int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1699 int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi,
1700 struct ip6_tnl *t);
1701 int xfrm6_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1702 int encap_type);
1703 int xfrm6_transport_finish(struct sk_buff *skb, int async);
1704 int xfrm6_rcv_tnl(struct sk_buff *skb, struct ip6_tnl *t);
1705 int xfrm6_rcv(struct sk_buff *skb);
1706 int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1707 xfrm_address_t *saddr, u8 proto);
1708 void xfrm6_local_error(struct sk_buff *skb, u32 mtu);
1709 int xfrm6_protocol_register(struct xfrm6_protocol *handler, unsigned char protocol);
1710 int xfrm6_protocol_deregister(struct xfrm6_protocol *handler, unsigned char protocol);
1711 int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1712 int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1713 __be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1714 __be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr);
1715 int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1716
1717 #ifdef CONFIG_XFRM
1718 void xfrm6_local_rxpmtu(struct sk_buff *skb, u32 mtu);
1719 int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1720 int xfrm6_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1721 int xfrm_user_policy(struct sock *sk, int optname, sockptr_t optval,
1722 int optlen);
1723 #else
xfrm_user_policy(struct sock * sk,int optname,sockptr_t optval,int optlen)1724 static inline int xfrm_user_policy(struct sock *sk, int optname,
1725 sockptr_t optval, int optlen)
1726 {
1727 return -ENOPROTOOPT;
1728 }
1729 #endif
1730
1731 struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, int oif,
1732 const xfrm_address_t *saddr,
1733 const xfrm_address_t *daddr,
1734 int family, u32 mark);
1735
1736 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1737
1738 void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1739 int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1740 int (*func)(struct xfrm_policy *, int, int, void*),
1741 void *);
1742 void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net);
1743 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1744 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net,
1745 const struct xfrm_mark *mark,
1746 u32 if_id, u8 type, int dir,
1747 struct xfrm_selector *sel,
1748 struct xfrm_sec_ctx *ctx, int delete,
1749 int *err);
1750 struct xfrm_policy *xfrm_policy_byid(struct net *net,
1751 const struct xfrm_mark *mark, u32 if_id,
1752 u8 type, int dir, u32 id, int delete,
1753 int *err);
1754 int xfrm_policy_flush(struct net *net, u8 type, bool task_valid);
1755 void xfrm_policy_hash_rebuild(struct net *net);
1756 u32 xfrm_get_acqseq(void);
1757 int verify_spi_info(u8 proto, u32 min, u32 max, struct netlink_ext_ack *extack);
1758 int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi,
1759 struct netlink_ext_ack *extack);
1760 struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark,
1761 u8 mode, u32 reqid, u32 if_id, u8 proto,
1762 const xfrm_address_t *daddr,
1763 const xfrm_address_t *saddr, int create,
1764 unsigned short family);
1765 int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1766
1767 #ifdef CONFIG_XFRM_MIGRATE
1768 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1769 const struct xfrm_migrate *m, int num_bundles,
1770 const struct xfrm_kmaddress *k,
1771 const struct xfrm_encap_tmpl *encap);
1772 struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net,
1773 u32 if_id);
1774 struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1775 struct xfrm_migrate *m,
1776 struct xfrm_encap_tmpl *encap);
1777 int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1778 struct xfrm_migrate *m, int num_bundles,
1779 struct xfrm_kmaddress *k, struct net *net,
1780 struct xfrm_encap_tmpl *encap, u32 if_id,
1781 struct netlink_ext_ack *extack);
1782 #endif
1783
1784 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1785 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid);
1786 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel,
1787 xfrm_address_t *addr);
1788
1789 void xfrm_input_init(void);
1790 int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1791
1792 void xfrm_probe_algs(void);
1793 int xfrm_count_pfkey_auth_supported(void);
1794 int xfrm_count_pfkey_enc_supported(void);
1795 struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1796 struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1797 struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1798 struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1799 struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1800 struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe);
1801 struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe);
1802 struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe);
1803 struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len,
1804 int probe);
1805
xfrm6_addr_equal(const xfrm_address_t * a,const xfrm_address_t * b)1806 static inline bool xfrm6_addr_equal(const xfrm_address_t *a,
1807 const xfrm_address_t *b)
1808 {
1809 return ipv6_addr_equal((const struct in6_addr *)a,
1810 (const struct in6_addr *)b);
1811 }
1812
xfrm_addr_equal(const xfrm_address_t * a,const xfrm_address_t * b,sa_family_t family)1813 static inline bool xfrm_addr_equal(const xfrm_address_t *a,
1814 const xfrm_address_t *b,
1815 sa_family_t family)
1816 {
1817 switch (family) {
1818 default:
1819 case AF_INET:
1820 return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0;
1821 case AF_INET6:
1822 return xfrm6_addr_equal(a, b);
1823 }
1824 }
1825
xfrm_policy_id2dir(u32 index)1826 static inline int xfrm_policy_id2dir(u32 index)
1827 {
1828 return index & 7;
1829 }
1830
1831 #ifdef CONFIG_XFRM
1832 void xfrm_replay_advance(struct xfrm_state *x, __be32 net_seq);
1833 int xfrm_replay_check(struct xfrm_state *x, struct sk_buff *skb, __be32 net_seq);
1834 void xfrm_replay_notify(struct xfrm_state *x, int event);
1835 int xfrm_replay_overflow(struct xfrm_state *x, struct sk_buff *skb);
1836 int xfrm_replay_recheck(struct xfrm_state *x, struct sk_buff *skb, __be32 net_seq);
1837
xfrm_aevent_is_on(struct net * net)1838 static inline int xfrm_aevent_is_on(struct net *net)
1839 {
1840 struct sock *nlsk;
1841 int ret = 0;
1842
1843 rcu_read_lock();
1844 nlsk = rcu_dereference(net->xfrm.nlsk);
1845 if (nlsk)
1846 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1847 rcu_read_unlock();
1848 return ret;
1849 }
1850
xfrm_acquire_is_on(struct net * net)1851 static inline int xfrm_acquire_is_on(struct net *net)
1852 {
1853 struct sock *nlsk;
1854 int ret = 0;
1855
1856 rcu_read_lock();
1857 nlsk = rcu_dereference(net->xfrm.nlsk);
1858 if (nlsk)
1859 ret = netlink_has_listeners(nlsk, XFRMNLGRP_ACQUIRE);
1860 rcu_read_unlock();
1861
1862 return ret;
1863 }
1864 #endif
1865
aead_len(struct xfrm_algo_aead * alg)1866 static inline unsigned int aead_len(struct xfrm_algo_aead *alg)
1867 {
1868 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1869 }
1870
xfrm_alg_len(const struct xfrm_algo * alg)1871 static inline unsigned int xfrm_alg_len(const struct xfrm_algo *alg)
1872 {
1873 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1874 }
1875
xfrm_alg_auth_len(const struct xfrm_algo_auth * alg)1876 static inline unsigned int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg)
1877 {
1878 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1879 }
1880
xfrm_replay_state_esn_len(struct xfrm_replay_state_esn * replay_esn)1881 static inline unsigned int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn)
1882 {
1883 return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32);
1884 }
1885
1886 #ifdef CONFIG_XFRM_MIGRATE
xfrm_replay_clone(struct xfrm_state * x,struct xfrm_state * orig)1887 static inline int xfrm_replay_clone(struct xfrm_state *x,
1888 struct xfrm_state *orig)
1889 {
1890
1891 x->replay_esn = kmemdup(orig->replay_esn,
1892 xfrm_replay_state_esn_len(orig->replay_esn),
1893 GFP_KERNEL);
1894 if (!x->replay_esn)
1895 return -ENOMEM;
1896 x->preplay_esn = kmemdup(orig->preplay_esn,
1897 xfrm_replay_state_esn_len(orig->preplay_esn),
1898 GFP_KERNEL);
1899 if (!x->preplay_esn)
1900 return -ENOMEM;
1901
1902 return 0;
1903 }
1904
xfrm_algo_aead_clone(struct xfrm_algo_aead * orig)1905 static inline struct xfrm_algo_aead *xfrm_algo_aead_clone(struct xfrm_algo_aead *orig)
1906 {
1907 return kmemdup(orig, aead_len(orig), GFP_KERNEL);
1908 }
1909
1910
xfrm_algo_clone(struct xfrm_algo * orig)1911 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1912 {
1913 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1914 }
1915
xfrm_algo_auth_clone(struct xfrm_algo_auth * orig)1916 static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1917 {
1918 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1919 }
1920
xfrm_states_put(struct xfrm_state ** states,int n)1921 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1922 {
1923 int i;
1924 for (i = 0; i < n; i++)
1925 xfrm_state_put(*(states + i));
1926 }
1927
xfrm_states_delete(struct xfrm_state ** states,int n)1928 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1929 {
1930 int i;
1931 for (i = 0; i < n; i++)
1932 xfrm_state_delete(*(states + i));
1933 }
1934 #endif
1935
1936 void __init xfrm_dev_init(void);
1937
1938 #ifdef CONFIG_XFRM_OFFLOAD
1939 void xfrm_dev_resume(struct sk_buff *skb);
1940 void xfrm_dev_backlog(struct softnet_data *sd);
1941 struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again);
1942 int xfrm_dev_state_add(struct net *net, struct xfrm_state *x,
1943 struct xfrm_user_offload *xuo,
1944 struct netlink_ext_ack *extack);
1945 int xfrm_dev_policy_add(struct net *net, struct xfrm_policy *xp,
1946 struct xfrm_user_offload *xuo, u8 dir,
1947 struct netlink_ext_ack *extack);
1948 bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x);
1949 void xfrm_dev_state_delete(struct xfrm_state *x);
1950 void xfrm_dev_state_free(struct xfrm_state *x);
1951
xfrm_dev_state_advance_esn(struct xfrm_state * x)1952 static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
1953 {
1954 struct xfrm_dev_offload *xso = &x->xso;
1955 struct net_device *dev = READ_ONCE(xso->dev);
1956
1957 if (dev && dev->xfrmdev_ops->xdo_dev_state_advance_esn)
1958 dev->xfrmdev_ops->xdo_dev_state_advance_esn(x);
1959 }
1960
xfrm_dst_offload_ok(struct dst_entry * dst)1961 static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
1962 {
1963 struct xfrm_state *x = dst->xfrm;
1964 struct xfrm_dst *xdst;
1965
1966 if (!x || !x->type_offload)
1967 return false;
1968
1969 xdst = (struct xfrm_dst *) dst;
1970 if (!x->xso.offload_handle && !xdst->child->xfrm)
1971 return true;
1972 if (x->xso.offload_handle && (x->xso.dev == xfrm_dst_path(dst)->dev) &&
1973 !xdst->child->xfrm)
1974 return true;
1975
1976 return false;
1977 }
1978
xfrm_dev_policy_delete(struct xfrm_policy * x)1979 static inline void xfrm_dev_policy_delete(struct xfrm_policy *x)
1980 {
1981 struct xfrm_dev_offload *xdo = &x->xdo;
1982 struct net_device *dev = xdo->dev;
1983
1984 if (dev && dev->xfrmdev_ops && dev->xfrmdev_ops->xdo_dev_policy_delete)
1985 dev->xfrmdev_ops->xdo_dev_policy_delete(x);
1986 }
1987
xfrm_dev_policy_free(struct xfrm_policy * x)1988 static inline void xfrm_dev_policy_free(struct xfrm_policy *x)
1989 {
1990 struct xfrm_dev_offload *xdo = &x->xdo;
1991 struct net_device *dev = xdo->dev;
1992
1993 if (dev && dev->xfrmdev_ops) {
1994 if (dev->xfrmdev_ops->xdo_dev_policy_free)
1995 dev->xfrmdev_ops->xdo_dev_policy_free(x);
1996 xdo->dev = NULL;
1997 netdev_put(dev, &xdo->dev_tracker);
1998 }
1999 }
2000 #else
xfrm_dev_resume(struct sk_buff * skb)2001 static inline void xfrm_dev_resume(struct sk_buff *skb)
2002 {
2003 }
2004
xfrm_dev_backlog(struct softnet_data * sd)2005 static inline void xfrm_dev_backlog(struct softnet_data *sd)
2006 {
2007 }
2008
validate_xmit_xfrm(struct sk_buff * skb,netdev_features_t features,bool * again)2009 static inline struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again)
2010 {
2011 return skb;
2012 }
2013
xfrm_dev_state_add(struct net * net,struct xfrm_state * x,struct xfrm_user_offload * xuo,struct netlink_ext_ack * extack)2014 static inline int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, struct xfrm_user_offload *xuo, struct netlink_ext_ack *extack)
2015 {
2016 return 0;
2017 }
2018
xfrm_dev_state_delete(struct xfrm_state * x)2019 static inline void xfrm_dev_state_delete(struct xfrm_state *x)
2020 {
2021 }
2022
xfrm_dev_state_free(struct xfrm_state * x)2023 static inline void xfrm_dev_state_free(struct xfrm_state *x)
2024 {
2025 }
2026
xfrm_dev_policy_add(struct net * net,struct xfrm_policy * xp,struct xfrm_user_offload * xuo,u8 dir,struct netlink_ext_ack * extack)2027 static inline int xfrm_dev_policy_add(struct net *net, struct xfrm_policy *xp,
2028 struct xfrm_user_offload *xuo, u8 dir,
2029 struct netlink_ext_ack *extack)
2030 {
2031 return 0;
2032 }
2033
xfrm_dev_policy_delete(struct xfrm_policy * x)2034 static inline void xfrm_dev_policy_delete(struct xfrm_policy *x)
2035 {
2036 }
2037
xfrm_dev_policy_free(struct xfrm_policy * x)2038 static inline void xfrm_dev_policy_free(struct xfrm_policy *x)
2039 {
2040 }
2041
xfrm_dev_offload_ok(struct sk_buff * skb,struct xfrm_state * x)2042 static inline bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x)
2043 {
2044 return false;
2045 }
2046
xfrm_dev_state_advance_esn(struct xfrm_state * x)2047 static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
2048 {
2049 }
2050
xfrm_dst_offload_ok(struct dst_entry * dst)2051 static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
2052 {
2053 return false;
2054 }
2055 #endif
2056
xfrm_mark_get(struct nlattr ** attrs,struct xfrm_mark * m)2057 static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
2058 {
2059 if (attrs[XFRMA_MARK])
2060 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark));
2061 else
2062 m->v = m->m = 0;
2063
2064 return m->v & m->m;
2065 }
2066
xfrm_mark_put(struct sk_buff * skb,const struct xfrm_mark * m)2067 static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m)
2068 {
2069 int ret = 0;
2070
2071 if (m->m | m->v)
2072 ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
2073 return ret;
2074 }
2075
xfrm_smark_get(__u32 mark,struct xfrm_state * x)2076 static inline __u32 xfrm_smark_get(__u32 mark, struct xfrm_state *x)
2077 {
2078 struct xfrm_mark *m = &x->props.smark;
2079
2080 return (m->v & m->m) | (mark & ~m->m);
2081 }
2082
xfrm_if_id_put(struct sk_buff * skb,__u32 if_id)2083 static inline int xfrm_if_id_put(struct sk_buff *skb, __u32 if_id)
2084 {
2085 int ret = 0;
2086
2087 if (if_id)
2088 ret = nla_put_u32(skb, XFRMA_IF_ID, if_id);
2089 return ret;
2090 }
2091
xfrm_tunnel_check(struct sk_buff * skb,struct xfrm_state * x,unsigned int family)2092 static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x,
2093 unsigned int family)
2094 {
2095 bool tunnel = false;
2096
2097 switch(family) {
2098 case AF_INET:
2099 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4)
2100 tunnel = true;
2101 break;
2102 case AF_INET6:
2103 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6)
2104 tunnel = true;
2105 break;
2106 }
2107 if (tunnel && !(x->outer_mode.flags & XFRM_MODE_FLAG_TUNNEL))
2108 return -EINVAL;
2109
2110 return 0;
2111 }
2112
2113 extern const int xfrm_msg_min[XFRM_NR_MSGTYPES];
2114 extern const struct nla_policy xfrma_policy[XFRMA_MAX+1];
2115
2116 struct xfrm_translator {
2117 /* Allocate frag_list and put compat translation there */
2118 int (*alloc_compat)(struct sk_buff *skb, const struct nlmsghdr *src);
2119
2120 /* Allocate nlmsg with 64-bit translaton of received 32-bit message */
2121 struct nlmsghdr *(*rcv_msg_compat)(const struct nlmsghdr *nlh,
2122 int maxtype, const struct nla_policy *policy,
2123 struct netlink_ext_ack *extack);
2124
2125 /* Translate 32-bit user_policy from sockptr */
2126 int (*xlate_user_policy_sockptr)(u8 **pdata32, int optlen);
2127
2128 struct module *owner;
2129 };
2130
2131 #if IS_ENABLED(CONFIG_XFRM_USER_COMPAT)
2132 extern int xfrm_register_translator(struct xfrm_translator *xtr);
2133 extern int xfrm_unregister_translator(struct xfrm_translator *xtr);
2134 extern struct xfrm_translator *xfrm_get_translator(void);
2135 extern void xfrm_put_translator(struct xfrm_translator *xtr);
2136 #else
xfrm_get_translator(void)2137 static inline struct xfrm_translator *xfrm_get_translator(void)
2138 {
2139 return NULL;
2140 }
xfrm_put_translator(struct xfrm_translator * xtr)2141 static inline void xfrm_put_translator(struct xfrm_translator *xtr)
2142 {
2143 }
2144 #endif
2145
2146 #if IS_ENABLED(CONFIG_IPV6)
xfrm6_local_dontfrag(const struct sock * sk)2147 static inline bool xfrm6_local_dontfrag(const struct sock *sk)
2148 {
2149 int proto;
2150
2151 if (!sk || sk->sk_family != AF_INET6)
2152 return false;
2153
2154 proto = sk->sk_protocol;
2155 if (proto == IPPROTO_UDP || proto == IPPROTO_RAW)
2156 return inet6_sk(sk)->dontfrag;
2157
2158 return false;
2159 }
2160 #endif
2161
2162 #if (IS_BUILTIN(CONFIG_XFRM_INTERFACE) && IS_ENABLED(CONFIG_DEBUG_INFO_BTF)) || \
2163 (IS_MODULE(CONFIG_XFRM_INTERFACE) && IS_ENABLED(CONFIG_DEBUG_INFO_BTF_MODULES))
2164
2165 extern struct metadata_dst __percpu *xfrm_bpf_md_dst;
2166
2167 int register_xfrm_interface_bpf(void);
2168
2169 #else
2170
register_xfrm_interface_bpf(void)2171 static inline int register_xfrm_interface_bpf(void)
2172 {
2173 return 0;
2174 }
2175
2176 #endif
2177
2178 #endif /* _NET_XFRM_H */
2179