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 #define XFRM_ADD_STATS(net, field, val) SNMP_ADD_STATS((net)->mib.xfrm_statistics, field, val)
55 #else
56 #define XFRM_INC_STATS(net, field) ((void)(net))
57 #define XFRM_ADD_STATS(net, field, val) ((void)(net))
58 #endif
59
60
61 /* Organization of SPD aka "XFRM rules"
62 ------------------------------------
63
64 Basic objects:
65 - policy rule, struct xfrm_policy (=SPD entry)
66 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
67 - instance of a transformer, struct xfrm_state (=SA)
68 - template to clone xfrm_state, struct xfrm_tmpl
69
70 SPD is organized as hash table (for policies that meet minimum address prefix
71 length setting, net->xfrm.policy_hthresh). Other policies are stored in
72 lists, sorted into rbtree ordered by destination and source address networks.
73 See net/xfrm/xfrm_policy.c for details.
74
75 (To be compatible with existing pfkeyv2 implementations,
76 many rules with priority of 0x7fffffff are allowed to exist and
77 such rules are ordered in an unpredictable way, thanks to bsd folks.)
78
79 If "action" is "block", then we prohibit the flow, otherwise:
80 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
81 policy entry has list of up to XFRM_MAX_DEPTH transformations,
82 described by templates xfrm_tmpl. Each template is resolved
83 to a complete xfrm_state (see below) and we pack bundle of transformations
84 to a dst_entry returned to requester.
85
86 dst -. xfrm .-> xfrm_state #1
87 |---. child .-> dst -. xfrm .-> xfrm_state #2
88 |---. child .-> dst -. xfrm .-> xfrm_state #3
89 |---. child .-> NULL
90
91
92 Resolution of xrfm_tmpl
93 -----------------------
94 Template contains:
95 1. ->mode Mode: transport or tunnel
96 2. ->id.proto Protocol: AH/ESP/IPCOMP
97 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode.
98 Q: allow to resolve security gateway?
99 4. ->id.spi If not zero, static SPI.
100 5. ->saddr Local tunnel endpoint, ignored for transport mode.
101 6. ->algos List of allowed algos. Plain bitmask now.
102 Q: ealgos, aalgos, calgos. What a mess...
103 7. ->share Sharing mode.
104 Q: how to implement private sharing mode? To add struct sock* to
105 flow id?
106
107 Having this template we search through SAD searching for entries
108 with appropriate mode/proto/algo, permitted by selector.
109 If no appropriate entry found, it is requested from key manager.
110
111 PROBLEMS:
112 Q: How to find all the bundles referring to a physical path for
113 PMTU discovery? Seems, dst should contain list of all parents...
114 and enter to infinite locking hierarchy disaster.
115 No! It is easier, we will not search for them, let them find us.
116 We add genid to each dst plus pointer to genid of raw IP route,
117 pmtu disc will update pmtu on raw IP route and increase its genid.
118 dst_check() will see this for top level and trigger resyncing
119 metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
120 */
121
122 struct xfrm_state_walk {
123 struct list_head all;
124 u8 state;
125 u8 dying;
126 u8 proto;
127 u32 seq;
128 struct xfrm_address_filter *filter;
129 };
130
131 enum {
132 XFRM_DEV_OFFLOAD_IN = 1,
133 XFRM_DEV_OFFLOAD_OUT,
134 XFRM_DEV_OFFLOAD_FWD,
135 };
136
137 enum {
138 XFRM_DEV_OFFLOAD_UNSPECIFIED,
139 XFRM_DEV_OFFLOAD_CRYPTO,
140 XFRM_DEV_OFFLOAD_PACKET,
141 };
142
143 enum {
144 XFRM_DEV_OFFLOAD_FLAG_ACQ = 1,
145 };
146
147 struct xfrm_dev_offload {
148 struct net_device *dev;
149 netdevice_tracker dev_tracker;
150 struct net_device *real_dev;
151 unsigned long offload_handle;
152 u8 dir : 2;
153 u8 type : 2;
154 u8 flags : 2;
155 };
156
157 struct xfrm_mode {
158 u8 encap;
159 u8 family;
160 u8 flags;
161 };
162
163 /* Flags for xfrm_mode. */
164 enum {
165 XFRM_MODE_FLAG_TUNNEL = 1,
166 };
167
168 enum xfrm_replay_mode {
169 XFRM_REPLAY_MODE_LEGACY,
170 XFRM_REPLAY_MODE_BMP,
171 XFRM_REPLAY_MODE_ESN,
172 };
173
174 /* Full description of state of transformer. */
175 struct xfrm_state {
176 possible_net_t xs_net;
177 union {
178 struct hlist_node gclist;
179 struct hlist_node bydst;
180 };
181 union {
182 struct hlist_node dev_gclist;
183 struct hlist_node bysrc;
184 };
185 struct hlist_node byspi;
186 struct hlist_node byseq;
187 struct hlist_node state_cache;
188 struct hlist_node state_cache_input;
189
190 refcount_t refcnt;
191 spinlock_t lock;
192
193 u32 pcpu_num;
194 struct xfrm_id id;
195 struct xfrm_selector sel;
196 struct xfrm_mark mark;
197 u32 if_id;
198 u32 tfcpad;
199
200 u32 genid;
201
202 /* Key manager bits */
203 struct xfrm_state_walk km;
204
205 /* Parameters of this state. */
206 struct {
207 u32 reqid;
208 u8 mode;
209 u8 replay_window;
210 u8 aalgo, ealgo, calgo;
211 u8 flags;
212 u16 family;
213 xfrm_address_t saddr;
214 int header_len;
215 int trailer_len;
216 u32 extra_flags;
217 struct xfrm_mark smark;
218 } props;
219
220 struct xfrm_lifetime_cfg lft;
221
222 /* Data for transformer */
223 struct xfrm_algo_auth *aalg;
224 struct xfrm_algo *ealg;
225 struct xfrm_algo *calg;
226 struct xfrm_algo_aead *aead;
227 const char *geniv;
228
229 /* mapping change rate limiting */
230 __be16 new_mapping_sport;
231 u32 new_mapping; /* seconds */
232 u32 mapping_maxage; /* seconds for input SA */
233
234 /* Data for encapsulator */
235 struct xfrm_encap_tmpl *encap;
236 struct sock __rcu *encap_sk;
237
238 /* NAT keepalive */
239 u32 nat_keepalive_interval; /* seconds */
240 time64_t nat_keepalive_expiration;
241
242 /* Data for care-of address */
243 xfrm_address_t *coaddr;
244
245 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
246 struct xfrm_state *tunnel;
247
248 /* If a tunnel, number of users + 1 */
249 atomic_t tunnel_users;
250
251 /* State for replay detection */
252 struct xfrm_replay_state replay;
253 struct xfrm_replay_state_esn *replay_esn;
254
255 /* Replay detection state at the time we sent the last notification */
256 struct xfrm_replay_state preplay;
257 struct xfrm_replay_state_esn *preplay_esn;
258
259 /* replay detection mode */
260 enum xfrm_replay_mode repl_mode;
261 /* internal flag that only holds state for delayed aevent at the
262 * moment
263 */
264 u32 xflags;
265
266 /* Replay detection notification settings */
267 u32 replay_maxage;
268 u32 replay_maxdiff;
269
270 /* Replay detection notification timer */
271 struct timer_list rtimer;
272
273 /* Statistics */
274 struct xfrm_stats stats;
275
276 struct xfrm_lifetime_cur curlft;
277 struct hrtimer mtimer;
278
279 struct xfrm_dev_offload xso;
280
281 /* used to fix curlft->add_time when changing date */
282 long saved_tmo;
283
284 /* Last used time */
285 time64_t lastused;
286
287 struct page_frag xfrag;
288
289 /* Reference to data common to all the instances of this
290 * transformer. */
291 const struct xfrm_type *type;
292 struct xfrm_mode inner_mode;
293 struct xfrm_mode inner_mode_iaf;
294 struct xfrm_mode outer_mode;
295
296 const struct xfrm_type_offload *type_offload;
297
298 /* Security context */
299 struct xfrm_sec_ctx *security;
300
301 /* Private data of this transformer, format is opaque,
302 * interpreted by xfrm_type methods. */
303 void *data;
304 u8 dir;
305 };
306
xs_net(struct xfrm_state * x)307 static inline struct net *xs_net(struct xfrm_state *x)
308 {
309 return read_pnet(&x->xs_net);
310 }
311
312 /* xflags - make enum if more show up */
313 #define XFRM_TIME_DEFER 1
314 #define XFRM_SOFT_EXPIRE 2
315
316 enum {
317 XFRM_STATE_VOID,
318 XFRM_STATE_ACQ,
319 XFRM_STATE_VALID,
320 XFRM_STATE_ERROR,
321 XFRM_STATE_EXPIRED,
322 XFRM_STATE_DEAD
323 };
324
325 /* callback structure passed from either netlink or pfkey */
326 struct km_event {
327 union {
328 u32 hard;
329 u32 proto;
330 u32 byid;
331 u32 aevent;
332 u32 type;
333 } data;
334
335 u32 seq;
336 u32 portid;
337 u32 event;
338 struct net *net;
339 };
340
341 struct xfrm_if_decode_session_result {
342 struct net *net;
343 u32 if_id;
344 };
345
346 struct xfrm_if_cb {
347 bool (*decode_session)(struct sk_buff *skb,
348 unsigned short family,
349 struct xfrm_if_decode_session_result *res);
350 };
351
352 void xfrm_if_register_cb(const struct xfrm_if_cb *ifcb);
353 void xfrm_if_unregister_cb(void);
354
355 struct xfrm_dst_lookup_params {
356 struct net *net;
357 int tos;
358 int oif;
359 xfrm_address_t *saddr;
360 xfrm_address_t *daddr;
361 u32 mark;
362 __u8 ipproto;
363 union flowi_uli uli;
364 };
365
366 struct net_device;
367 struct xfrm_type;
368 struct xfrm_dst;
369 struct xfrm_policy_afinfo {
370 struct dst_ops *dst_ops;
371 struct dst_entry *(*dst_lookup)(const struct xfrm_dst_lookup_params *params);
372 int (*get_saddr)(xfrm_address_t *saddr,
373 const struct xfrm_dst_lookup_params *params);
374 int (*fill_dst)(struct xfrm_dst *xdst,
375 struct net_device *dev,
376 const struct flowi *fl);
377 struct dst_entry *(*blackhole_route)(struct net *net, struct dst_entry *orig);
378 };
379
380 int xfrm_policy_register_afinfo(const struct xfrm_policy_afinfo *afinfo, int family);
381 void xfrm_policy_unregister_afinfo(const struct xfrm_policy_afinfo *afinfo);
382 void km_policy_notify(struct xfrm_policy *xp, int dir,
383 const struct km_event *c);
384 void km_state_notify(struct xfrm_state *x, const struct km_event *c);
385
386 struct xfrm_tmpl;
387 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t,
388 struct xfrm_policy *pol);
389 void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
390 int __xfrm_state_delete(struct xfrm_state *x);
391
392 struct xfrm_state_afinfo {
393 u8 family;
394 u8 proto;
395
396 const struct xfrm_type_offload *type_offload_esp;
397
398 const struct xfrm_type *type_esp;
399 const struct xfrm_type *type_ipip;
400 const struct xfrm_type *type_ipip6;
401 const struct xfrm_type *type_comp;
402 const struct xfrm_type *type_ah;
403 const struct xfrm_type *type_routing;
404 const struct xfrm_type *type_dstopts;
405
406 int (*output)(struct net *net, struct sock *sk, struct sk_buff *skb);
407 int (*transport_finish)(struct sk_buff *skb,
408 int async);
409 void (*local_error)(struct sk_buff *skb, u32 mtu);
410 };
411
412 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
413 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
414 struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family);
415 struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family);
416
417 struct xfrm_input_afinfo {
418 u8 family;
419 bool is_ipip;
420 int (*callback)(struct sk_buff *skb, u8 protocol,
421 int err);
422 };
423
424 int xfrm_input_register_afinfo(const struct xfrm_input_afinfo *afinfo);
425 int xfrm_input_unregister_afinfo(const struct xfrm_input_afinfo *afinfo);
426
427 void xfrm_flush_gc(void);
428 void xfrm_state_delete_tunnel(struct xfrm_state *x);
429
430 struct xfrm_type {
431 struct module *owner;
432 u8 proto;
433 u8 flags;
434 #define XFRM_TYPE_NON_FRAGMENT 1
435 #define XFRM_TYPE_REPLAY_PROT 2
436 #define XFRM_TYPE_LOCAL_COADDR 4
437 #define XFRM_TYPE_REMOTE_COADDR 8
438
439 int (*init_state)(struct xfrm_state *x,
440 struct netlink_ext_ack *extack);
441 void (*destructor)(struct xfrm_state *);
442 int (*input)(struct xfrm_state *, struct sk_buff *skb);
443 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
444 int (*reject)(struct xfrm_state *, struct sk_buff *,
445 const struct flowi *);
446 };
447
448 int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
449 void xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
450
451 struct xfrm_type_offload {
452 struct module *owner;
453 u8 proto;
454 void (*encap)(struct xfrm_state *, struct sk_buff *pskb);
455 int (*input_tail)(struct xfrm_state *x, struct sk_buff *skb);
456 int (*xmit)(struct xfrm_state *, struct sk_buff *pskb, netdev_features_t features);
457 };
458
459 int xfrm_register_type_offload(const struct xfrm_type_offload *type, unsigned short family);
460 void xfrm_unregister_type_offload(const struct xfrm_type_offload *type, unsigned short family);
461
xfrm_af2proto(unsigned int family)462 static inline int xfrm_af2proto(unsigned int family)
463 {
464 switch(family) {
465 case AF_INET:
466 return IPPROTO_IPIP;
467 case AF_INET6:
468 return IPPROTO_IPV6;
469 default:
470 return 0;
471 }
472 }
473
xfrm_ip2inner_mode(struct xfrm_state * x,int ipproto)474 static inline const struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
475 {
476 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
477 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
478 return &x->inner_mode;
479 else
480 return &x->inner_mode_iaf;
481 }
482
483 struct xfrm_tmpl {
484 /* id in template is interpreted as:
485 * daddr - destination of tunnel, may be zero for transport mode.
486 * spi - zero to acquire spi. Not zero if spi is static, then
487 * daddr must be fixed too.
488 * proto - AH/ESP/IPCOMP
489 */
490 struct xfrm_id id;
491
492 /* Source address of tunnel. Ignored, if it is not a tunnel. */
493 xfrm_address_t saddr;
494
495 unsigned short encap_family;
496
497 u32 reqid;
498
499 /* Mode: transport, tunnel etc. */
500 u8 mode;
501
502 /* Sharing mode: unique, this session only, this user only etc. */
503 u8 share;
504
505 /* May skip this transfomration if no SA is found */
506 u8 optional;
507
508 /* Skip aalgos/ealgos/calgos checks. */
509 u8 allalgs;
510
511 /* Bit mask of algos allowed for acquisition */
512 u32 aalgos;
513 u32 ealgos;
514 u32 calgos;
515 };
516
517 #define XFRM_MAX_DEPTH 6
518 #define XFRM_MAX_OFFLOAD_DEPTH 1
519
520 struct xfrm_policy_walk_entry {
521 struct list_head all;
522 u8 dead;
523 };
524
525 struct xfrm_policy_walk {
526 struct xfrm_policy_walk_entry walk;
527 u8 type;
528 u32 seq;
529 };
530
531 struct xfrm_policy_queue {
532 struct sk_buff_head hold_queue;
533 struct timer_list hold_timer;
534 unsigned long timeout;
535 };
536
537 /**
538 * struct xfrm_policy - xfrm policy
539 * @xp_net: network namespace the policy lives in
540 * @bydst: hlist node for SPD hash table or rbtree list
541 * @byidx: hlist node for index hash table
542 * @state_cache_list: hlist head for policy cached xfrm states
543 * @lock: serialize changes to policy structure members
544 * @refcnt: reference count, freed once it reaches 0
545 * @pos: kernel internal tie-breaker to determine age of policy
546 * @timer: timer
547 * @genid: generation, used to invalidate old policies
548 * @priority: priority, set by userspace
549 * @index: policy index (autogenerated)
550 * @if_id: virtual xfrm interface id
551 * @mark: packet mark
552 * @selector: selector
553 * @lft: liftime configuration data
554 * @curlft: liftime state
555 * @walk: list head on pernet policy list
556 * @polq: queue to hold packets while aqcuire operaion in progress
557 * @bydst_reinsert: policy tree node needs to be merged
558 * @type: XFRM_POLICY_TYPE_MAIN or _SUB
559 * @action: XFRM_POLICY_ALLOW or _BLOCK
560 * @flags: XFRM_POLICY_LOCALOK, XFRM_POLICY_ICMP
561 * @xfrm_nr: number of used templates in @xfrm_vec
562 * @family: protocol family
563 * @security: SELinux security label
564 * @xfrm_vec: array of templates to resolve state
565 * @rcu: rcu head, used to defer memory release
566 * @xdo: hardware offload state
567 */
568 struct xfrm_policy {
569 possible_net_t xp_net;
570 struct hlist_node bydst;
571 struct hlist_node byidx;
572
573 struct hlist_head state_cache_list;
574
575 /* This lock only affects elements except for entry. */
576 rwlock_t lock;
577 refcount_t refcnt;
578 u32 pos;
579 struct timer_list timer;
580
581 atomic_t genid;
582 u32 priority;
583 u32 index;
584 u32 if_id;
585 struct xfrm_mark mark;
586 struct xfrm_selector selector;
587 struct xfrm_lifetime_cfg lft;
588 struct xfrm_lifetime_cur curlft;
589 struct xfrm_policy_walk_entry walk;
590 struct xfrm_policy_queue polq;
591 bool bydst_reinsert;
592 u8 type;
593 u8 action;
594 u8 flags;
595 u8 xfrm_nr;
596 u16 family;
597 struct xfrm_sec_ctx *security;
598 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
599 struct rcu_head rcu;
600
601 struct xfrm_dev_offload xdo;
602 };
603
xp_net(const struct xfrm_policy * xp)604 static inline struct net *xp_net(const struct xfrm_policy *xp)
605 {
606 return read_pnet(&xp->xp_net);
607 }
608
609 struct xfrm_kmaddress {
610 xfrm_address_t local;
611 xfrm_address_t remote;
612 u32 reserved;
613 u16 family;
614 };
615
616 struct xfrm_migrate {
617 xfrm_address_t old_daddr;
618 xfrm_address_t old_saddr;
619 xfrm_address_t new_daddr;
620 xfrm_address_t new_saddr;
621 u8 proto;
622 u8 mode;
623 u16 reserved;
624 u32 reqid;
625 u16 old_family;
626 u16 new_family;
627 };
628
629 #define XFRM_KM_TIMEOUT 30
630 /* what happened */
631 #define XFRM_REPLAY_UPDATE XFRM_AE_CR
632 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
633
634 /* default aevent timeout in units of 100ms */
635 #define XFRM_AE_ETIME 10
636 /* Async Event timer multiplier */
637 #define XFRM_AE_ETH_M 10
638 /* default seq threshold size */
639 #define XFRM_AE_SEQT_SIZE 2
640
641 struct xfrm_mgr {
642 struct list_head list;
643 int (*notify)(struct xfrm_state *x, const struct km_event *c);
644 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp);
645 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
646 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
647 int (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c);
648 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
649 int (*migrate)(const struct xfrm_selector *sel,
650 u8 dir, u8 type,
651 const struct xfrm_migrate *m,
652 int num_bundles,
653 const struct xfrm_kmaddress *k,
654 const struct xfrm_encap_tmpl *encap);
655 bool (*is_alive)(const struct km_event *c);
656 };
657
658 void xfrm_register_km(struct xfrm_mgr *km);
659 void xfrm_unregister_km(struct xfrm_mgr *km);
660
661 struct xfrm_tunnel_skb_cb {
662 union {
663 struct inet_skb_parm h4;
664 struct inet6_skb_parm h6;
665 } header;
666
667 union {
668 struct ip_tunnel *ip4;
669 struct ip6_tnl *ip6;
670 } tunnel;
671 };
672
673 #define XFRM_TUNNEL_SKB_CB(__skb) ((struct xfrm_tunnel_skb_cb *)&((__skb)->cb[0]))
674
675 /*
676 * This structure is used for the duration where packets are being
677 * transformed by IPsec. As soon as the packet leaves IPsec the
678 * area beyond the generic IP part may be overwritten.
679 */
680 struct xfrm_skb_cb {
681 struct xfrm_tunnel_skb_cb header;
682
683 /* Sequence number for replay protection. */
684 union {
685 struct {
686 __u32 low;
687 __u32 hi;
688 } output;
689 struct {
690 __be32 low;
691 __be32 hi;
692 } input;
693 } seq;
694 };
695
696 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
697
698 /*
699 * This structure is used by the afinfo prepare_input/prepare_output functions
700 * to transmit header information to the mode input/output functions.
701 */
702 struct xfrm_mode_skb_cb {
703 struct xfrm_tunnel_skb_cb header;
704
705 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
706 __be16 id;
707 __be16 frag_off;
708
709 /* IP header length (excluding options or extension headers). */
710 u8 ihl;
711
712 /* TOS for IPv4, class for IPv6. */
713 u8 tos;
714
715 /* TTL for IPv4, hop limitfor IPv6. */
716 u8 ttl;
717
718 /* Protocol for IPv4, NH for IPv6. */
719 u8 protocol;
720
721 /* Option length for IPv4, zero for IPv6. */
722 u8 optlen;
723
724 /* Used by IPv6 only, zero for IPv4. */
725 u8 flow_lbl[3];
726 };
727
728 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
729
730 /*
731 * This structure is used by the input processing to locate the SPI and
732 * related information.
733 */
734 struct xfrm_spi_skb_cb {
735 struct xfrm_tunnel_skb_cb header;
736
737 unsigned int daddroff;
738 unsigned int family;
739 __be32 seq;
740 };
741
742 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
743
744 #ifdef CONFIG_AUDITSYSCALL
xfrm_audit_start(const char * op)745 static inline struct audit_buffer *xfrm_audit_start(const char *op)
746 {
747 struct audit_buffer *audit_buf = NULL;
748
749 if (audit_enabled == AUDIT_OFF)
750 return NULL;
751 audit_buf = audit_log_start(audit_context(), GFP_ATOMIC,
752 AUDIT_MAC_IPSEC_EVENT);
753 if (audit_buf == NULL)
754 return NULL;
755 audit_log_format(audit_buf, "op=%s", op);
756 return audit_buf;
757 }
758
xfrm_audit_helper_usrinfo(bool task_valid,struct audit_buffer * audit_buf)759 static inline void xfrm_audit_helper_usrinfo(bool task_valid,
760 struct audit_buffer *audit_buf)
761 {
762 const unsigned int auid = from_kuid(&init_user_ns, task_valid ?
763 audit_get_loginuid(current) :
764 INVALID_UID);
765 const unsigned int ses = task_valid ? audit_get_sessionid(current) :
766 AUDIT_SID_UNSET;
767
768 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
769 audit_log_task_context(audit_buf);
770 }
771
772 void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid);
773 void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
774 bool task_valid);
775 void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid);
776 void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid);
777 void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
778 struct sk_buff *skb);
779 void xfrm_audit_state_replay(struct xfrm_state *x, struct sk_buff *skb,
780 __be32 net_seq);
781 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
782 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, __be32 net_spi,
783 __be32 net_seq);
784 void xfrm_audit_state_icvfail(struct xfrm_state *x, struct sk_buff *skb,
785 u8 proto);
786 #else
787
xfrm_audit_policy_add(struct xfrm_policy * xp,int result,bool task_valid)788 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
789 bool task_valid)
790 {
791 }
792
xfrm_audit_policy_delete(struct xfrm_policy * xp,int result,bool task_valid)793 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
794 bool task_valid)
795 {
796 }
797
xfrm_audit_state_add(struct xfrm_state * x,int result,bool task_valid)798 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
799 bool task_valid)
800 {
801 }
802
xfrm_audit_state_delete(struct xfrm_state * x,int result,bool task_valid)803 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
804 bool task_valid)
805 {
806 }
807
xfrm_audit_state_replay_overflow(struct xfrm_state * x,struct sk_buff * skb)808 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
809 struct sk_buff *skb)
810 {
811 }
812
xfrm_audit_state_replay(struct xfrm_state * x,struct sk_buff * skb,__be32 net_seq)813 static inline void xfrm_audit_state_replay(struct xfrm_state *x,
814 struct sk_buff *skb, __be32 net_seq)
815 {
816 }
817
xfrm_audit_state_notfound_simple(struct sk_buff * skb,u16 family)818 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
819 u16 family)
820 {
821 }
822
xfrm_audit_state_notfound(struct sk_buff * skb,u16 family,__be32 net_spi,__be32 net_seq)823 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
824 __be32 net_spi, __be32 net_seq)
825 {
826 }
827
xfrm_audit_state_icvfail(struct xfrm_state * x,struct sk_buff * skb,u8 proto)828 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
829 struct sk_buff *skb, u8 proto)
830 {
831 }
832 #endif /* CONFIG_AUDITSYSCALL */
833
xfrm_pol_hold(struct xfrm_policy * policy)834 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
835 {
836 if (likely(policy != NULL))
837 refcount_inc(&policy->refcnt);
838 }
839
840 void xfrm_policy_destroy(struct xfrm_policy *policy);
841
xfrm_pol_put(struct xfrm_policy * policy)842 static inline void xfrm_pol_put(struct xfrm_policy *policy)
843 {
844 if (refcount_dec_and_test(&policy->refcnt))
845 xfrm_policy_destroy(policy);
846 }
847
xfrm_pols_put(struct xfrm_policy ** pols,int npols)848 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
849 {
850 int i;
851 for (i = npols - 1; i >= 0; --i)
852 xfrm_pol_put(pols[i]);
853 }
854
855 void __xfrm_state_destroy(struct xfrm_state *, bool);
856
__xfrm_state_put(struct xfrm_state * x)857 static inline void __xfrm_state_put(struct xfrm_state *x)
858 {
859 refcount_dec(&x->refcnt);
860 }
861
xfrm_state_put(struct xfrm_state * x)862 static inline void xfrm_state_put(struct xfrm_state *x)
863 {
864 if (refcount_dec_and_test(&x->refcnt))
865 __xfrm_state_destroy(x, false);
866 }
867
xfrm_state_put_sync(struct xfrm_state * x)868 static inline void xfrm_state_put_sync(struct xfrm_state *x)
869 {
870 if (refcount_dec_and_test(&x->refcnt))
871 __xfrm_state_destroy(x, true);
872 }
873
xfrm_state_hold(struct xfrm_state * x)874 static inline void xfrm_state_hold(struct xfrm_state *x)
875 {
876 refcount_inc(&x->refcnt);
877 }
878
addr_match(const void * token1,const void * token2,unsigned int prefixlen)879 static inline bool addr_match(const void *token1, const void *token2,
880 unsigned int prefixlen)
881 {
882 const __be32 *a1 = token1;
883 const __be32 *a2 = token2;
884 unsigned int pdw;
885 unsigned int pbi;
886
887 pdw = prefixlen >> 5; /* num of whole u32 in prefix */
888 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
889
890 if (pdw)
891 if (memcmp(a1, a2, pdw << 2))
892 return false;
893
894 if (pbi) {
895 __be32 mask;
896
897 mask = htonl((0xffffffff) << (32 - pbi));
898
899 if ((a1[pdw] ^ a2[pdw]) & mask)
900 return false;
901 }
902
903 return true;
904 }
905
addr4_match(__be32 a1,__be32 a2,u8 prefixlen)906 static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen)
907 {
908 /* C99 6.5.7 (3): u32 << 32 is undefined behaviour */
909 if (sizeof(long) == 4 && prefixlen == 0)
910 return true;
911 return !((a1 ^ a2) & htonl(~0UL << (32 - prefixlen)));
912 }
913
914 static __inline__
xfrm_flowi_sport(const struct flowi * fl,const union flowi_uli * uli)915 __be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli)
916 {
917 __be16 port;
918 switch(fl->flowi_proto) {
919 case IPPROTO_TCP:
920 case IPPROTO_UDP:
921 case IPPROTO_UDPLITE:
922 case IPPROTO_SCTP:
923 port = uli->ports.sport;
924 break;
925 case IPPROTO_ICMP:
926 case IPPROTO_ICMPV6:
927 port = htons(uli->icmpt.type);
928 break;
929 case IPPROTO_MH:
930 port = htons(uli->mht.type);
931 break;
932 case IPPROTO_GRE:
933 port = htons(ntohl(uli->gre_key) >> 16);
934 break;
935 default:
936 port = 0; /*XXX*/
937 }
938 return port;
939 }
940
941 static __inline__
xfrm_flowi_dport(const struct flowi * fl,const union flowi_uli * uli)942 __be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli)
943 {
944 __be16 port;
945 switch(fl->flowi_proto) {
946 case IPPROTO_TCP:
947 case IPPROTO_UDP:
948 case IPPROTO_UDPLITE:
949 case IPPROTO_SCTP:
950 port = uli->ports.dport;
951 break;
952 case IPPROTO_ICMP:
953 case IPPROTO_ICMPV6:
954 port = htons(uli->icmpt.code);
955 break;
956 case IPPROTO_GRE:
957 port = htons(ntohl(uli->gre_key) & 0xffff);
958 break;
959 default:
960 port = 0; /*XXX*/
961 }
962 return port;
963 }
964
965 bool xfrm_selector_match(const struct xfrm_selector *sel,
966 const struct flowi *fl, unsigned short family);
967
968 #ifdef CONFIG_SECURITY_NETWORK_XFRM
969 /* If neither has a context --> match
970 * Otherwise, both must have a context and the sids, doi, alg must match
971 */
xfrm_sec_ctx_match(struct xfrm_sec_ctx * s1,struct xfrm_sec_ctx * s2)972 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
973 {
974 return ((!s1 && !s2) ||
975 (s1 && s2 &&
976 (s1->ctx_sid == s2->ctx_sid) &&
977 (s1->ctx_doi == s2->ctx_doi) &&
978 (s1->ctx_alg == s2->ctx_alg)));
979 }
980 #else
xfrm_sec_ctx_match(struct xfrm_sec_ctx * s1,struct xfrm_sec_ctx * s2)981 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
982 {
983 return true;
984 }
985 #endif
986
987 /* A struct encoding bundle of transformations to apply to some set of flow.
988 *
989 * xdst->child points to the next element of bundle.
990 * dst->xfrm points to an instanse of transformer.
991 *
992 * Due to unfortunate limitations of current routing cache, which we
993 * have no time to fix, it mirrors struct rtable and bound to the same
994 * routing key, including saddr,daddr. However, we can have many of
995 * bundles differing by session id. All the bundles grow from a parent
996 * policy rule.
997 */
998 struct xfrm_dst {
999 union {
1000 struct dst_entry dst;
1001 struct rtable rt;
1002 struct rt6_info rt6;
1003 } u;
1004 struct dst_entry *route;
1005 struct dst_entry *child;
1006 struct dst_entry *path;
1007 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
1008 int num_pols, num_xfrms;
1009 u32 xfrm_genid;
1010 u32 policy_genid;
1011 u32 route_mtu_cached;
1012 u32 child_mtu_cached;
1013 u32 route_cookie;
1014 u32 path_cookie;
1015 };
1016
xfrm_dst_path(const struct dst_entry * dst)1017 static inline struct dst_entry *xfrm_dst_path(const struct dst_entry *dst)
1018 {
1019 #ifdef CONFIG_XFRM
1020 if (dst->xfrm || (dst->flags & DST_XFRM_QUEUE)) {
1021 const struct xfrm_dst *xdst = (const struct xfrm_dst *) dst;
1022
1023 return xdst->path;
1024 }
1025 #endif
1026 return (struct dst_entry *) dst;
1027 }
1028
xfrm_dst_child(const struct dst_entry * dst)1029 static inline struct dst_entry *xfrm_dst_child(const struct dst_entry *dst)
1030 {
1031 #ifdef CONFIG_XFRM
1032 if (dst->xfrm || (dst->flags & DST_XFRM_QUEUE)) {
1033 struct xfrm_dst *xdst = (struct xfrm_dst *) dst;
1034 return xdst->child;
1035 }
1036 #endif
1037 return NULL;
1038 }
1039
1040 #ifdef CONFIG_XFRM
xfrm_dst_set_child(struct xfrm_dst * xdst,struct dst_entry * child)1041 static inline void xfrm_dst_set_child(struct xfrm_dst *xdst, struct dst_entry *child)
1042 {
1043 xdst->child = child;
1044 }
1045
xfrm_dst_destroy(struct xfrm_dst * xdst)1046 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
1047 {
1048 xfrm_pols_put(xdst->pols, xdst->num_pols);
1049 dst_release(xdst->route);
1050 if (likely(xdst->u.dst.xfrm))
1051 xfrm_state_put(xdst->u.dst.xfrm);
1052 }
1053 #endif
1054
1055 void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
1056
1057 struct xfrm_if_parms {
1058 int link; /* ifindex of underlying L2 interface */
1059 u32 if_id; /* interface identifier */
1060 bool collect_md;
1061 };
1062
1063 struct xfrm_if {
1064 struct xfrm_if __rcu *next; /* next interface in list */
1065 struct net_device *dev; /* virtual device associated with interface */
1066 struct net *net; /* netns for packet i/o */
1067 struct xfrm_if_parms p; /* interface parms */
1068
1069 struct gro_cells gro_cells;
1070 };
1071
1072 struct xfrm_offload {
1073 /* Output sequence number for replay protection on offloading. */
1074 struct {
1075 __u32 low;
1076 __u32 hi;
1077 } seq;
1078
1079 __u32 flags;
1080 #define SA_DELETE_REQ 1
1081 #define CRYPTO_DONE 2
1082 #define CRYPTO_NEXT_DONE 4
1083 #define CRYPTO_FALLBACK 8
1084 #define XFRM_GSO_SEGMENT 16
1085 #define XFRM_GRO 32
1086 /* 64 is free */
1087 #define XFRM_DEV_RESUME 128
1088 #define XFRM_XMIT 256
1089
1090 __u32 status;
1091 #define CRYPTO_SUCCESS 1
1092 #define CRYPTO_GENERIC_ERROR 2
1093 #define CRYPTO_TRANSPORT_AH_AUTH_FAILED 4
1094 #define CRYPTO_TRANSPORT_ESP_AUTH_FAILED 8
1095 #define CRYPTO_TUNNEL_AH_AUTH_FAILED 16
1096 #define CRYPTO_TUNNEL_ESP_AUTH_FAILED 32
1097 #define CRYPTO_INVALID_PACKET_SYNTAX 64
1098 #define CRYPTO_INVALID_PROTOCOL 128
1099
1100 /* Used to keep whole l2 header for transport mode GRO */
1101 __u32 orig_mac_len;
1102
1103 __u8 proto;
1104 __u8 inner_ipproto;
1105 };
1106
1107 struct sec_path {
1108 int len;
1109 int olen;
1110 int verified_cnt;
1111
1112 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
1113 struct xfrm_offload ovec[XFRM_MAX_OFFLOAD_DEPTH];
1114 };
1115
1116 struct sec_path *secpath_set(struct sk_buff *skb);
1117
1118 static inline void
secpath_reset(struct sk_buff * skb)1119 secpath_reset(struct sk_buff *skb)
1120 {
1121 #ifdef CONFIG_XFRM
1122 skb_ext_del(skb, SKB_EXT_SEC_PATH);
1123 #endif
1124 }
1125
1126 static inline int
xfrm_addr_any(const xfrm_address_t * addr,unsigned short family)1127 xfrm_addr_any(const xfrm_address_t *addr, unsigned short family)
1128 {
1129 switch (family) {
1130 case AF_INET:
1131 return addr->a4 == 0;
1132 case AF_INET6:
1133 return ipv6_addr_any(&addr->in6);
1134 }
1135 return 0;
1136 }
1137
1138 static inline int
__xfrm4_state_addr_cmp(const struct xfrm_tmpl * tmpl,const struct xfrm_state * x)1139 __xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1140 {
1141 return (tmpl->saddr.a4 &&
1142 tmpl->saddr.a4 != x->props.saddr.a4);
1143 }
1144
1145 static inline int
__xfrm6_state_addr_cmp(const struct xfrm_tmpl * tmpl,const struct xfrm_state * x)1146 __xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1147 {
1148 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
1149 !ipv6_addr_equal((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
1150 }
1151
1152 static inline int
xfrm_state_addr_cmp(const struct xfrm_tmpl * tmpl,const struct xfrm_state * x,unsigned short family)1153 xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family)
1154 {
1155 switch (family) {
1156 case AF_INET:
1157 return __xfrm4_state_addr_cmp(tmpl, x);
1158 case AF_INET6:
1159 return __xfrm6_state_addr_cmp(tmpl, x);
1160 }
1161 return !0;
1162 }
1163
1164 #ifdef CONFIG_XFRM
xfrm_input_state(struct sk_buff * skb)1165 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1166 {
1167 struct sec_path *sp = skb_sec_path(skb);
1168
1169 return sp->xvec[sp->len - 1];
1170 }
1171 #endif
1172
xfrm_offload(struct sk_buff * skb)1173 static inline struct xfrm_offload *xfrm_offload(struct sk_buff *skb)
1174 {
1175 #ifdef CONFIG_XFRM
1176 struct sec_path *sp = skb_sec_path(skb);
1177
1178 if (!sp || !sp->olen || sp->len != sp->olen)
1179 return NULL;
1180
1181 return &sp->ovec[sp->olen - 1];
1182 #else
1183 return NULL;
1184 #endif
1185 }
1186
1187 #ifdef CONFIG_XFRM
1188 int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb,
1189 unsigned short family);
1190
__xfrm_check_nopolicy(struct net * net,struct sk_buff * skb,int dir)1191 static inline bool __xfrm_check_nopolicy(struct net *net, struct sk_buff *skb,
1192 int dir)
1193 {
1194 if (!net->xfrm.policy_count[dir] && !secpath_exists(skb))
1195 return net->xfrm.policy_default[dir] == XFRM_USERPOLICY_ACCEPT;
1196
1197 return false;
1198 }
1199
__xfrm_check_dev_nopolicy(struct sk_buff * skb,int dir,unsigned short family)1200 static inline bool __xfrm_check_dev_nopolicy(struct sk_buff *skb,
1201 int dir, unsigned short family)
1202 {
1203 if (dir != XFRM_POLICY_OUT && family == AF_INET) {
1204 /* same dst may be used for traffic originating from
1205 * devices with different policy settings.
1206 */
1207 return IPCB(skb)->flags & IPSKB_NOPOLICY;
1208 }
1209 return skb_dst(skb) && (skb_dst(skb)->flags & DST_NOPOLICY);
1210 }
1211
__xfrm_policy_check2(struct sock * sk,int dir,struct sk_buff * skb,unsigned int family,int reverse)1212 static inline int __xfrm_policy_check2(struct sock *sk, int dir,
1213 struct sk_buff *skb,
1214 unsigned int family, int reverse)
1215 {
1216 struct net *net = dev_net(skb->dev);
1217 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
1218 struct xfrm_offload *xo = xfrm_offload(skb);
1219 struct xfrm_state *x;
1220
1221 if (sk && sk->sk_policy[XFRM_POLICY_IN])
1222 return __xfrm_policy_check(sk, ndir, skb, family);
1223
1224 if (xo) {
1225 x = xfrm_input_state(skb);
1226 if (x->xso.type == XFRM_DEV_OFFLOAD_PACKET) {
1227 bool check = (xo->flags & CRYPTO_DONE) &&
1228 (xo->status & CRYPTO_SUCCESS);
1229
1230 /* The packets here are plain ones and secpath was
1231 * needed to indicate that hardware already handled
1232 * them and there is no need to do nothing in addition.
1233 *
1234 * Consume secpath which was set by drivers.
1235 */
1236 secpath_reset(skb);
1237 return check;
1238 }
1239 }
1240
1241 return __xfrm_check_nopolicy(net, skb, dir) ||
1242 __xfrm_check_dev_nopolicy(skb, dir, family) ||
1243 __xfrm_policy_check(sk, ndir, skb, family);
1244 }
1245
xfrm_policy_check(struct sock * sk,int dir,struct sk_buff * skb,unsigned short family)1246 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1247 {
1248 return __xfrm_policy_check2(sk, dir, skb, family, 0);
1249 }
1250
xfrm4_policy_check(struct sock * sk,int dir,struct sk_buff * skb)1251 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1252 {
1253 return xfrm_policy_check(sk, dir, skb, AF_INET);
1254 }
1255
xfrm6_policy_check(struct sock * sk,int dir,struct sk_buff * skb)1256 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1257 {
1258 return xfrm_policy_check(sk, dir, skb, AF_INET6);
1259 }
1260
xfrm4_policy_check_reverse(struct sock * sk,int dir,struct sk_buff * skb)1261 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1262 struct sk_buff *skb)
1263 {
1264 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1265 }
1266
xfrm6_policy_check_reverse(struct sock * sk,int dir,struct sk_buff * skb)1267 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1268 struct sk_buff *skb)
1269 {
1270 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1271 }
1272
1273 int __xfrm_decode_session(struct net *net, struct sk_buff *skb, struct flowi *fl,
1274 unsigned int family, int reverse);
1275
xfrm_decode_session(struct net * net,struct sk_buff * skb,struct flowi * fl,unsigned int family)1276 static inline int xfrm_decode_session(struct net *net, struct sk_buff *skb, struct flowi *fl,
1277 unsigned int family)
1278 {
1279 return __xfrm_decode_session(net, skb, fl, family, 0);
1280 }
1281
xfrm_decode_session_reverse(struct net * net,struct sk_buff * skb,struct flowi * fl,unsigned int family)1282 static inline int xfrm_decode_session_reverse(struct net *net, struct sk_buff *skb,
1283 struct flowi *fl,
1284 unsigned int family)
1285 {
1286 return __xfrm_decode_session(net, skb, fl, family, 1);
1287 }
1288
1289 int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1290
xfrm_route_forward(struct sk_buff * skb,unsigned short family)1291 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1292 {
1293 struct net *net = dev_net(skb->dev);
1294
1295 if (!net->xfrm.policy_count[XFRM_POLICY_OUT] &&
1296 net->xfrm.policy_default[XFRM_POLICY_OUT] == XFRM_USERPOLICY_ACCEPT)
1297 return true;
1298
1299 return (skb_dst(skb)->flags & DST_NOXFRM) ||
1300 __xfrm_route_forward(skb, family);
1301 }
1302
xfrm4_route_forward(struct sk_buff * skb)1303 static inline int xfrm4_route_forward(struct sk_buff *skb)
1304 {
1305 return xfrm_route_forward(skb, AF_INET);
1306 }
1307
xfrm6_route_forward(struct sk_buff * skb)1308 static inline int xfrm6_route_forward(struct sk_buff *skb)
1309 {
1310 return xfrm_route_forward(skb, AF_INET6);
1311 }
1312
1313 int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk);
1314
xfrm_sk_clone_policy(struct sock * sk,const struct sock * osk)1315 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk)
1316 {
1317 if (!sk_fullsock(osk))
1318 return 0;
1319 sk->sk_policy[0] = NULL;
1320 sk->sk_policy[1] = NULL;
1321 if (unlikely(osk->sk_policy[0] || osk->sk_policy[1]))
1322 return __xfrm_sk_clone_policy(sk, osk);
1323 return 0;
1324 }
1325
1326 int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1327
xfrm_sk_free_policy(struct sock * sk)1328 static inline void xfrm_sk_free_policy(struct sock *sk)
1329 {
1330 struct xfrm_policy *pol;
1331
1332 pol = rcu_dereference_protected(sk->sk_policy[0], 1);
1333 if (unlikely(pol != NULL)) {
1334 xfrm_policy_delete(pol, XFRM_POLICY_MAX);
1335 sk->sk_policy[0] = NULL;
1336 }
1337 pol = rcu_dereference_protected(sk->sk_policy[1], 1);
1338 if (unlikely(pol != NULL)) {
1339 xfrm_policy_delete(pol, XFRM_POLICY_MAX+1);
1340 sk->sk_policy[1] = NULL;
1341 }
1342 }
1343
1344 #else
1345
xfrm_sk_free_policy(struct sock * sk)1346 static inline void xfrm_sk_free_policy(struct sock *sk) {}
xfrm_sk_clone_policy(struct sock * sk,const struct sock * osk)1347 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) { return 0; }
xfrm6_route_forward(struct sk_buff * skb)1348 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
xfrm4_route_forward(struct sk_buff * skb)1349 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
xfrm6_policy_check(struct sock * sk,int dir,struct sk_buff * skb)1350 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1351 {
1352 return 1;
1353 }
xfrm4_policy_check(struct sock * sk,int dir,struct sk_buff * skb)1354 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1355 {
1356 return 1;
1357 }
xfrm_policy_check(struct sock * sk,int dir,struct sk_buff * skb,unsigned short family)1358 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1359 {
1360 return 1;
1361 }
xfrm_decode_session_reverse(struct net * net,struct sk_buff * skb,struct flowi * fl,unsigned int family)1362 static inline int xfrm_decode_session_reverse(struct net *net, struct sk_buff *skb,
1363 struct flowi *fl,
1364 unsigned int family)
1365 {
1366 return -ENOSYS;
1367 }
xfrm4_policy_check_reverse(struct sock * sk,int dir,struct sk_buff * skb)1368 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1369 struct sk_buff *skb)
1370 {
1371 return 1;
1372 }
xfrm6_policy_check_reverse(struct sock * sk,int dir,struct sk_buff * skb)1373 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1374 struct sk_buff *skb)
1375 {
1376 return 1;
1377 }
1378 #endif
1379
1380 static __inline__
xfrm_flowi_daddr(const struct flowi * fl,unsigned short family)1381 xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family)
1382 {
1383 switch (family){
1384 case AF_INET:
1385 return (xfrm_address_t *)&fl->u.ip4.daddr;
1386 case AF_INET6:
1387 return (xfrm_address_t *)&fl->u.ip6.daddr;
1388 }
1389 return NULL;
1390 }
1391
1392 static __inline__
xfrm_flowi_saddr(const struct flowi * fl,unsigned short family)1393 xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family)
1394 {
1395 switch (family){
1396 case AF_INET:
1397 return (xfrm_address_t *)&fl->u.ip4.saddr;
1398 case AF_INET6:
1399 return (xfrm_address_t *)&fl->u.ip6.saddr;
1400 }
1401 return NULL;
1402 }
1403
1404 static __inline__
xfrm_flowi_addr_get(const struct flowi * fl,xfrm_address_t * saddr,xfrm_address_t * daddr,unsigned short family)1405 void xfrm_flowi_addr_get(const struct flowi *fl,
1406 xfrm_address_t *saddr, xfrm_address_t *daddr,
1407 unsigned short family)
1408 {
1409 switch(family) {
1410 case AF_INET:
1411 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4));
1412 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4));
1413 break;
1414 case AF_INET6:
1415 saddr->in6 = fl->u.ip6.saddr;
1416 daddr->in6 = fl->u.ip6.daddr;
1417 break;
1418 }
1419 }
1420
1421 static __inline__ int
__xfrm4_state_addr_check(const struct xfrm_state * x,const xfrm_address_t * daddr,const xfrm_address_t * saddr)1422 __xfrm4_state_addr_check(const struct xfrm_state *x,
1423 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1424 {
1425 if (daddr->a4 == x->id.daddr.a4 &&
1426 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1427 return 1;
1428 return 0;
1429 }
1430
1431 static __inline__ int
__xfrm6_state_addr_check(const struct xfrm_state * x,const xfrm_address_t * daddr,const xfrm_address_t * saddr)1432 __xfrm6_state_addr_check(const struct xfrm_state *x,
1433 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1434 {
1435 if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1436 (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) ||
1437 ipv6_addr_any((struct in6_addr *)saddr) ||
1438 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1439 return 1;
1440 return 0;
1441 }
1442
1443 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)1444 xfrm_state_addr_check(const struct xfrm_state *x,
1445 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1446 unsigned short family)
1447 {
1448 switch (family) {
1449 case AF_INET:
1450 return __xfrm4_state_addr_check(x, daddr, saddr);
1451 case AF_INET6:
1452 return __xfrm6_state_addr_check(x, daddr, saddr);
1453 }
1454 return 0;
1455 }
1456
1457 static __inline__ int
xfrm_state_addr_flow_check(const struct xfrm_state * x,const struct flowi * fl,unsigned short family)1458 xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl,
1459 unsigned short family)
1460 {
1461 switch (family) {
1462 case AF_INET:
1463 return __xfrm4_state_addr_check(x,
1464 (const xfrm_address_t *)&fl->u.ip4.daddr,
1465 (const xfrm_address_t *)&fl->u.ip4.saddr);
1466 case AF_INET6:
1467 return __xfrm6_state_addr_check(x,
1468 (const xfrm_address_t *)&fl->u.ip6.daddr,
1469 (const xfrm_address_t *)&fl->u.ip6.saddr);
1470 }
1471 return 0;
1472 }
1473
xfrm_state_kern(const struct xfrm_state * x)1474 static inline int xfrm_state_kern(const struct xfrm_state *x)
1475 {
1476 return atomic_read(&x->tunnel_users);
1477 }
1478
xfrm_id_proto_valid(u8 proto)1479 static inline bool xfrm_id_proto_valid(u8 proto)
1480 {
1481 switch (proto) {
1482 case IPPROTO_AH:
1483 case IPPROTO_ESP:
1484 case IPPROTO_COMP:
1485 #if IS_ENABLED(CONFIG_IPV6)
1486 case IPPROTO_ROUTING:
1487 case IPPROTO_DSTOPTS:
1488 #endif
1489 return true;
1490 default:
1491 return false;
1492 }
1493 }
1494
1495 /* IPSEC_PROTO_ANY only matches 3 IPsec protocols, 0 could match all. */
xfrm_id_proto_match(u8 proto,u8 userproto)1496 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1497 {
1498 return (!userproto || proto == userproto ||
1499 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1500 proto == IPPROTO_ESP ||
1501 proto == IPPROTO_COMP)));
1502 }
1503
1504 /*
1505 * xfrm algorithm information
1506 */
1507 struct xfrm_algo_aead_info {
1508 char *geniv;
1509 u16 icv_truncbits;
1510 };
1511
1512 struct xfrm_algo_auth_info {
1513 u16 icv_truncbits;
1514 u16 icv_fullbits;
1515 };
1516
1517 struct xfrm_algo_encr_info {
1518 char *geniv;
1519 u16 blockbits;
1520 u16 defkeybits;
1521 };
1522
1523 struct xfrm_algo_comp_info {
1524 u16 threshold;
1525 };
1526
1527 struct xfrm_algo_desc {
1528 char *name;
1529 char *compat;
1530 u8 available:1;
1531 u8 pfkey_supported:1;
1532 union {
1533 struct xfrm_algo_aead_info aead;
1534 struct xfrm_algo_auth_info auth;
1535 struct xfrm_algo_encr_info encr;
1536 struct xfrm_algo_comp_info comp;
1537 } uinfo;
1538 struct sadb_alg desc;
1539 };
1540
1541 /* XFRM protocol handlers. */
1542 struct xfrm4_protocol {
1543 int (*handler)(struct sk_buff *skb);
1544 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1545 int encap_type);
1546 int (*cb_handler)(struct sk_buff *skb, int err);
1547 int (*err_handler)(struct sk_buff *skb, u32 info);
1548
1549 struct xfrm4_protocol __rcu *next;
1550 int priority;
1551 };
1552
1553 struct xfrm6_protocol {
1554 int (*handler)(struct sk_buff *skb);
1555 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1556 int encap_type);
1557 int (*cb_handler)(struct sk_buff *skb, int err);
1558 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1559 u8 type, u8 code, int offset, __be32 info);
1560
1561 struct xfrm6_protocol __rcu *next;
1562 int priority;
1563 };
1564
1565 /* XFRM tunnel handlers. */
1566 struct xfrm_tunnel {
1567 int (*handler)(struct sk_buff *skb);
1568 int (*cb_handler)(struct sk_buff *skb, int err);
1569 int (*err_handler)(struct sk_buff *skb, u32 info);
1570
1571 struct xfrm_tunnel __rcu *next;
1572 int priority;
1573 };
1574
1575 struct xfrm6_tunnel {
1576 int (*handler)(struct sk_buff *skb);
1577 int (*cb_handler)(struct sk_buff *skb, int err);
1578 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1579 u8 type, u8 code, int offset, __be32 info);
1580 struct xfrm6_tunnel __rcu *next;
1581 int priority;
1582 };
1583
1584 void xfrm_init(void);
1585 void xfrm4_init(void);
1586 int xfrm_state_init(struct net *net);
1587 void xfrm_state_fini(struct net *net);
1588 void xfrm4_state_init(void);
1589 void xfrm4_protocol_init(void);
1590 #ifdef CONFIG_XFRM
1591 int xfrm6_init(void);
1592 void xfrm6_fini(void);
1593 int xfrm6_state_init(void);
1594 void xfrm6_state_fini(void);
1595 int xfrm6_protocol_init(void);
1596 void xfrm6_protocol_fini(void);
1597 #else
xfrm6_init(void)1598 static inline int xfrm6_init(void)
1599 {
1600 return 0;
1601 }
xfrm6_fini(void)1602 static inline void xfrm6_fini(void)
1603 {
1604 ;
1605 }
1606 #endif
1607
1608 #ifdef CONFIG_XFRM_STATISTICS
1609 int xfrm_proc_init(struct net *net);
1610 void xfrm_proc_fini(struct net *net);
1611 #endif
1612
1613 int xfrm_sysctl_init(struct net *net);
1614 #ifdef CONFIG_SYSCTL
1615 void xfrm_sysctl_fini(struct net *net);
1616 #else
xfrm_sysctl_fini(struct net * net)1617 static inline void xfrm_sysctl_fini(struct net *net)
1618 {
1619 }
1620 #endif
1621
1622 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
1623 struct xfrm_address_filter *filter);
1624 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1625 int (*func)(struct xfrm_state *, int, void*), void *);
1626 void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net);
1627 struct xfrm_state *xfrm_state_alloc(struct net *net);
1628 void xfrm_state_free(struct xfrm_state *x);
1629 struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr,
1630 const xfrm_address_t *saddr,
1631 const struct flowi *fl,
1632 struct xfrm_tmpl *tmpl,
1633 struct xfrm_policy *pol, int *err,
1634 unsigned short family, u32 if_id);
1635 struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark, u32 if_id,
1636 xfrm_address_t *daddr,
1637 xfrm_address_t *saddr,
1638 unsigned short family,
1639 u8 mode, u8 proto, u32 reqid);
1640 struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
1641 unsigned short family);
1642 int xfrm_state_check_expire(struct xfrm_state *x);
1643 void xfrm_state_update_stats(struct net *net);
1644 #ifdef CONFIG_XFRM_OFFLOAD
xfrm_dev_state_update_stats(struct xfrm_state * x)1645 static inline void xfrm_dev_state_update_stats(struct xfrm_state *x)
1646 {
1647 struct xfrm_dev_offload *xdo = &x->xso;
1648 struct net_device *dev = READ_ONCE(xdo->dev);
1649
1650 if (dev && dev->xfrmdev_ops &&
1651 dev->xfrmdev_ops->xdo_dev_state_update_stats)
1652 dev->xfrmdev_ops->xdo_dev_state_update_stats(x);
1653
1654 }
1655 #else
xfrm_dev_state_update_stats(struct xfrm_state * x)1656 static inline void xfrm_dev_state_update_stats(struct xfrm_state *x) {}
1657 #endif
1658 void xfrm_state_insert(struct xfrm_state *x);
1659 int xfrm_state_add(struct xfrm_state *x);
1660 int xfrm_state_update(struct xfrm_state *x);
1661 struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1662 const xfrm_address_t *daddr, __be32 spi,
1663 u8 proto, unsigned short family);
1664 struct xfrm_state *xfrm_input_state_lookup(struct net *net, u32 mark,
1665 const xfrm_address_t *daddr,
1666 __be32 spi, u8 proto,
1667 unsigned short family);
1668 struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1669 const xfrm_address_t *daddr,
1670 const xfrm_address_t *saddr,
1671 u8 proto,
1672 unsigned short family);
1673 #ifdef CONFIG_XFRM_SUB_POLICY
1674 void xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1675 unsigned short family);
1676 void xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1677 unsigned short family);
1678 #else
xfrm_tmpl_sort(struct xfrm_tmpl ** d,struct xfrm_tmpl ** s,int n,unsigned short family)1679 static inline void xfrm_tmpl_sort(struct xfrm_tmpl **d, struct xfrm_tmpl **s,
1680 int n, unsigned short family)
1681 {
1682 }
1683
xfrm_state_sort(struct xfrm_state ** d,struct xfrm_state ** s,int n,unsigned short family)1684 static inline void xfrm_state_sort(struct xfrm_state **d, struct xfrm_state **s,
1685 int n, unsigned short family)
1686 {
1687 }
1688 #endif
1689
1690 struct xfrmk_sadinfo {
1691 u32 sadhcnt; /* current hash bkts */
1692 u32 sadhmcnt; /* max allowed hash bkts */
1693 u32 sadcnt; /* current running count */
1694 };
1695
1696 struct xfrmk_spdinfo {
1697 u32 incnt;
1698 u32 outcnt;
1699 u32 fwdcnt;
1700 u32 inscnt;
1701 u32 outscnt;
1702 u32 fwdscnt;
1703 u32 spdhcnt;
1704 u32 spdhmcnt;
1705 };
1706
1707 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq, u32 pcpu_num);
1708 int xfrm_state_delete(struct xfrm_state *x);
1709 int xfrm_state_flush(struct net *net, u8 proto, bool task_valid, bool sync);
1710 int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid);
1711 int xfrm_dev_policy_flush(struct net *net, struct net_device *dev,
1712 bool task_valid);
1713 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1714 void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1715 u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq);
1716 int xfrm_init_replay(struct xfrm_state *x, struct netlink_ext_ack *extack);
1717 u32 xfrm_state_mtu(struct xfrm_state *x, int mtu);
1718 int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload,
1719 struct netlink_ext_ack *extack);
1720 int xfrm_init_state(struct xfrm_state *x);
1721 int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type);
1722 int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1723 int xfrm_trans_queue_net(struct net *net, struct sk_buff *skb,
1724 int (*finish)(struct net *, struct sock *,
1725 struct sk_buff *));
1726 int xfrm_trans_queue(struct sk_buff *skb,
1727 int (*finish)(struct net *, struct sock *,
1728 struct sk_buff *));
1729 int xfrm_output_resume(struct sock *sk, struct sk_buff *skb, int err);
1730 int xfrm_output(struct sock *sk, struct sk_buff *skb);
1731
1732 int pktgen_xfrm_outer_mode_output(struct xfrm_state *x, struct sk_buff *skb);
1733
1734 void xfrm_local_error(struct sk_buff *skb, int mtu);
1735 int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1736 int encap_type);
1737 int xfrm4_transport_finish(struct sk_buff *skb, int async);
1738 int xfrm4_rcv(struct sk_buff *skb);
1739
xfrm4_rcv_spi(struct sk_buff * skb,int nexthdr,__be32 spi)1740 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1741 {
1742 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
1743 XFRM_SPI_SKB_CB(skb)->family = AF_INET;
1744 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
1745 return xfrm_input(skb, nexthdr, spi, 0);
1746 }
1747
1748 int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1749 int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol);
1750 int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol);
1751 int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1752 int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1753 void xfrm4_local_error(struct sk_buff *skb, u32 mtu);
1754 int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi,
1755 struct ip6_tnl *t);
1756 int xfrm6_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1757 int encap_type);
1758 int xfrm6_transport_finish(struct sk_buff *skb, int async);
1759 int xfrm6_rcv_tnl(struct sk_buff *skb, struct ip6_tnl *t);
1760 int xfrm6_rcv(struct sk_buff *skb);
1761 int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1762 xfrm_address_t *saddr, u8 proto);
1763 void xfrm6_local_error(struct sk_buff *skb, u32 mtu);
1764 int xfrm6_protocol_register(struct xfrm6_protocol *handler, unsigned char protocol);
1765 int xfrm6_protocol_deregister(struct xfrm6_protocol *handler, unsigned char protocol);
1766 int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1767 int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1768 __be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1769 __be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr);
1770 int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1771
1772 #ifdef CONFIG_XFRM
1773 void xfrm6_local_rxpmtu(struct sk_buff *skb, u32 mtu);
1774 int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1775 int xfrm6_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1776 struct sk_buff *xfrm4_gro_udp_encap_rcv(struct sock *sk, struct list_head *head,
1777 struct sk_buff *skb);
1778 struct sk_buff *xfrm6_gro_udp_encap_rcv(struct sock *sk, struct list_head *head,
1779 struct sk_buff *skb);
1780 int xfrm_user_policy(struct sock *sk, int optname, sockptr_t optval,
1781 int optlen);
1782 #else
xfrm_user_policy(struct sock * sk,int optname,sockptr_t optval,int optlen)1783 static inline int xfrm_user_policy(struct sock *sk, int optname,
1784 sockptr_t optval, int optlen)
1785 {
1786 return -ENOPROTOOPT;
1787 }
1788 #endif
1789
1790 struct dst_entry *__xfrm_dst_lookup(int family, const struct xfrm_dst_lookup_params *params);
1791
1792 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1793
1794 void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1795 int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1796 int (*func)(struct xfrm_policy *, int, int, void*),
1797 void *);
1798 void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net);
1799 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1800 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net,
1801 const struct xfrm_mark *mark,
1802 u32 if_id, u8 type, int dir,
1803 struct xfrm_selector *sel,
1804 struct xfrm_sec_ctx *ctx, int delete,
1805 int *err);
1806 struct xfrm_policy *xfrm_policy_byid(struct net *net,
1807 const struct xfrm_mark *mark, u32 if_id,
1808 u8 type, int dir, u32 id, int delete,
1809 int *err);
1810 int xfrm_policy_flush(struct net *net, u8 type, bool task_valid);
1811 void xfrm_policy_hash_rebuild(struct net *net);
1812 u32 xfrm_get_acqseq(void);
1813 int verify_spi_info(u8 proto, u32 min, u32 max, struct netlink_ext_ack *extack);
1814 int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi,
1815 struct netlink_ext_ack *extack);
1816 struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark,
1817 u8 mode, u32 reqid, u32 if_id, u32 pcpu_num, u8 proto,
1818 const xfrm_address_t *daddr,
1819 const xfrm_address_t *saddr, int create,
1820 unsigned short family);
1821 int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1822
1823 #ifdef CONFIG_XFRM_MIGRATE
1824 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1825 const struct xfrm_migrate *m, int num_bundles,
1826 const struct xfrm_kmaddress *k,
1827 const struct xfrm_encap_tmpl *encap);
1828 struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net,
1829 u32 if_id);
1830 struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1831 struct xfrm_migrate *m,
1832 struct xfrm_encap_tmpl *encap,
1833 struct net *net,
1834 struct xfrm_user_offload *xuo,
1835 struct netlink_ext_ack *extack);
1836 int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1837 struct xfrm_migrate *m, int num_bundles,
1838 struct xfrm_kmaddress *k, struct net *net,
1839 struct xfrm_encap_tmpl *encap, u32 if_id,
1840 struct netlink_ext_ack *extack,
1841 struct xfrm_user_offload *xuo);
1842 #endif
1843
1844 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1845 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid);
1846 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel,
1847 xfrm_address_t *addr);
1848
1849 void xfrm_input_init(void);
1850 int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1851
1852 void xfrm_probe_algs(void);
1853 int xfrm_count_pfkey_auth_supported(void);
1854 int xfrm_count_pfkey_enc_supported(void);
1855 struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1856 struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1857 struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1858 struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1859 struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1860 struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe);
1861 struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe);
1862 struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe);
1863 struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len,
1864 int probe);
1865
xfrm6_addr_equal(const xfrm_address_t * a,const xfrm_address_t * b)1866 static inline bool xfrm6_addr_equal(const xfrm_address_t *a,
1867 const xfrm_address_t *b)
1868 {
1869 return ipv6_addr_equal((const struct in6_addr *)a,
1870 (const struct in6_addr *)b);
1871 }
1872
xfrm_addr_equal(const xfrm_address_t * a,const xfrm_address_t * b,sa_family_t family)1873 static inline bool xfrm_addr_equal(const xfrm_address_t *a,
1874 const xfrm_address_t *b,
1875 sa_family_t family)
1876 {
1877 switch (family) {
1878 default:
1879 case AF_INET:
1880 return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0;
1881 case AF_INET6:
1882 return xfrm6_addr_equal(a, b);
1883 }
1884 }
1885
xfrm_policy_id2dir(u32 index)1886 static inline int xfrm_policy_id2dir(u32 index)
1887 {
1888 return index & 7;
1889 }
1890
1891 #ifdef CONFIG_XFRM
1892 void xfrm_replay_advance(struct xfrm_state *x, __be32 net_seq);
1893 int xfrm_replay_check(struct xfrm_state *x, struct sk_buff *skb, __be32 net_seq);
1894 void xfrm_replay_notify(struct xfrm_state *x, int event);
1895 int xfrm_replay_overflow(struct xfrm_state *x, struct sk_buff *skb);
1896 int xfrm_replay_recheck(struct xfrm_state *x, struct sk_buff *skb, __be32 net_seq);
1897
xfrm_aevent_is_on(struct net * net)1898 static inline int xfrm_aevent_is_on(struct net *net)
1899 {
1900 struct sock *nlsk;
1901 int ret = 0;
1902
1903 rcu_read_lock();
1904 nlsk = rcu_dereference(net->xfrm.nlsk);
1905 if (nlsk)
1906 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1907 rcu_read_unlock();
1908 return ret;
1909 }
1910
xfrm_acquire_is_on(struct net * net)1911 static inline int xfrm_acquire_is_on(struct net *net)
1912 {
1913 struct sock *nlsk;
1914 int ret = 0;
1915
1916 rcu_read_lock();
1917 nlsk = rcu_dereference(net->xfrm.nlsk);
1918 if (nlsk)
1919 ret = netlink_has_listeners(nlsk, XFRMNLGRP_ACQUIRE);
1920 rcu_read_unlock();
1921
1922 return ret;
1923 }
1924 #endif
1925
aead_len(struct xfrm_algo_aead * alg)1926 static inline unsigned int aead_len(struct xfrm_algo_aead *alg)
1927 {
1928 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1929 }
1930
xfrm_alg_len(const struct xfrm_algo * alg)1931 static inline unsigned int xfrm_alg_len(const struct xfrm_algo *alg)
1932 {
1933 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1934 }
1935
xfrm_alg_auth_len(const struct xfrm_algo_auth * alg)1936 static inline unsigned int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg)
1937 {
1938 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1939 }
1940
xfrm_replay_state_esn_len(struct xfrm_replay_state_esn * replay_esn)1941 static inline unsigned int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn)
1942 {
1943 return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32);
1944 }
1945
1946 #ifdef CONFIG_XFRM_MIGRATE
xfrm_replay_clone(struct xfrm_state * x,struct xfrm_state * orig)1947 static inline int xfrm_replay_clone(struct xfrm_state *x,
1948 struct xfrm_state *orig)
1949 {
1950
1951 x->replay_esn = kmemdup(orig->replay_esn,
1952 xfrm_replay_state_esn_len(orig->replay_esn),
1953 GFP_KERNEL);
1954 if (!x->replay_esn)
1955 return -ENOMEM;
1956 x->preplay_esn = kmemdup(orig->preplay_esn,
1957 xfrm_replay_state_esn_len(orig->preplay_esn),
1958 GFP_KERNEL);
1959 if (!x->preplay_esn)
1960 return -ENOMEM;
1961
1962 return 0;
1963 }
1964
xfrm_algo_aead_clone(struct xfrm_algo_aead * orig)1965 static inline struct xfrm_algo_aead *xfrm_algo_aead_clone(struct xfrm_algo_aead *orig)
1966 {
1967 return kmemdup(orig, aead_len(orig), GFP_KERNEL);
1968 }
1969
1970
xfrm_algo_clone(struct xfrm_algo * orig)1971 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1972 {
1973 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1974 }
1975
xfrm_algo_auth_clone(struct xfrm_algo_auth * orig)1976 static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1977 {
1978 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1979 }
1980
xfrm_states_put(struct xfrm_state ** states,int n)1981 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1982 {
1983 int i;
1984 for (i = 0; i < n; i++)
1985 xfrm_state_put(*(states + i));
1986 }
1987
xfrm_states_delete(struct xfrm_state ** states,int n)1988 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1989 {
1990 int i;
1991 for (i = 0; i < n; i++)
1992 xfrm_state_delete(*(states + i));
1993 }
1994 #endif
1995
1996 void __init xfrm_dev_init(void);
1997
1998 #ifdef CONFIG_XFRM_OFFLOAD
1999 void xfrm_dev_resume(struct sk_buff *skb);
2000 void xfrm_dev_backlog(struct softnet_data *sd);
2001 struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again);
2002 int xfrm_dev_state_add(struct net *net, struct xfrm_state *x,
2003 struct xfrm_user_offload *xuo,
2004 struct netlink_ext_ack *extack);
2005 int xfrm_dev_policy_add(struct net *net, struct xfrm_policy *xp,
2006 struct xfrm_user_offload *xuo, u8 dir,
2007 struct netlink_ext_ack *extack);
2008 bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x);
2009 void xfrm_dev_state_delete(struct xfrm_state *x);
2010 void xfrm_dev_state_free(struct xfrm_state *x);
2011
xfrm_dev_state_advance_esn(struct xfrm_state * x)2012 static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
2013 {
2014 struct xfrm_dev_offload *xso = &x->xso;
2015 struct net_device *dev = READ_ONCE(xso->dev);
2016
2017 if (dev && dev->xfrmdev_ops->xdo_dev_state_advance_esn)
2018 dev->xfrmdev_ops->xdo_dev_state_advance_esn(x);
2019 }
2020
xfrm_dst_offload_ok(struct dst_entry * dst)2021 static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
2022 {
2023 struct xfrm_state *x = dst->xfrm;
2024 struct xfrm_dst *xdst;
2025
2026 if (!x || !x->type_offload)
2027 return false;
2028
2029 xdst = (struct xfrm_dst *) dst;
2030 if (!x->xso.offload_handle && !xdst->child->xfrm)
2031 return true;
2032 if (x->xso.offload_handle && (x->xso.dev == xfrm_dst_path(dst)->dev) &&
2033 !xdst->child->xfrm)
2034 return true;
2035
2036 return false;
2037 }
2038
xfrm_dev_policy_delete(struct xfrm_policy * x)2039 static inline void xfrm_dev_policy_delete(struct xfrm_policy *x)
2040 {
2041 struct xfrm_dev_offload *xdo = &x->xdo;
2042 struct net_device *dev = xdo->dev;
2043
2044 if (dev && dev->xfrmdev_ops && dev->xfrmdev_ops->xdo_dev_policy_delete)
2045 dev->xfrmdev_ops->xdo_dev_policy_delete(x);
2046 }
2047
xfrm_dev_policy_free(struct xfrm_policy * x)2048 static inline void xfrm_dev_policy_free(struct xfrm_policy *x)
2049 {
2050 struct xfrm_dev_offload *xdo = &x->xdo;
2051 struct net_device *dev = xdo->dev;
2052
2053 if (dev && dev->xfrmdev_ops) {
2054 if (dev->xfrmdev_ops->xdo_dev_policy_free)
2055 dev->xfrmdev_ops->xdo_dev_policy_free(x);
2056 xdo->dev = NULL;
2057 netdev_put(dev, &xdo->dev_tracker);
2058 }
2059 }
2060 #else
xfrm_dev_resume(struct sk_buff * skb)2061 static inline void xfrm_dev_resume(struct sk_buff *skb)
2062 {
2063 }
2064
xfrm_dev_backlog(struct softnet_data * sd)2065 static inline void xfrm_dev_backlog(struct softnet_data *sd)
2066 {
2067 }
2068
validate_xmit_xfrm(struct sk_buff * skb,netdev_features_t features,bool * again)2069 static inline struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again)
2070 {
2071 return skb;
2072 }
2073
xfrm_dev_state_add(struct net * net,struct xfrm_state * x,struct xfrm_user_offload * xuo,struct netlink_ext_ack * extack)2074 static inline int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, struct xfrm_user_offload *xuo, struct netlink_ext_ack *extack)
2075 {
2076 return 0;
2077 }
2078
xfrm_dev_state_delete(struct xfrm_state * x)2079 static inline void xfrm_dev_state_delete(struct xfrm_state *x)
2080 {
2081 }
2082
xfrm_dev_state_free(struct xfrm_state * x)2083 static inline void xfrm_dev_state_free(struct xfrm_state *x)
2084 {
2085 }
2086
xfrm_dev_policy_add(struct net * net,struct xfrm_policy * xp,struct xfrm_user_offload * xuo,u8 dir,struct netlink_ext_ack * extack)2087 static inline int xfrm_dev_policy_add(struct net *net, struct xfrm_policy *xp,
2088 struct xfrm_user_offload *xuo, u8 dir,
2089 struct netlink_ext_ack *extack)
2090 {
2091 return 0;
2092 }
2093
xfrm_dev_policy_delete(struct xfrm_policy * x)2094 static inline void xfrm_dev_policy_delete(struct xfrm_policy *x)
2095 {
2096 }
2097
xfrm_dev_policy_free(struct xfrm_policy * x)2098 static inline void xfrm_dev_policy_free(struct xfrm_policy *x)
2099 {
2100 }
2101
xfrm_dev_offload_ok(struct sk_buff * skb,struct xfrm_state * x)2102 static inline bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x)
2103 {
2104 return false;
2105 }
2106
xfrm_dev_state_advance_esn(struct xfrm_state * x)2107 static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
2108 {
2109 }
2110
xfrm_dst_offload_ok(struct dst_entry * dst)2111 static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
2112 {
2113 return false;
2114 }
2115 #endif
2116
xfrm_mark_get(struct nlattr ** attrs,struct xfrm_mark * m)2117 static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
2118 {
2119 if (attrs[XFRMA_MARK])
2120 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark));
2121 else
2122 m->v = m->m = 0;
2123
2124 return m->v & m->m;
2125 }
2126
xfrm_mark_put(struct sk_buff * skb,const struct xfrm_mark * m)2127 static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m)
2128 {
2129 int ret = 0;
2130
2131 if (m->m | m->v)
2132 ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
2133 return ret;
2134 }
2135
xfrm_smark_get(__u32 mark,struct xfrm_state * x)2136 static inline __u32 xfrm_smark_get(__u32 mark, struct xfrm_state *x)
2137 {
2138 struct xfrm_mark *m = &x->props.smark;
2139
2140 return (m->v & m->m) | (mark & ~m->m);
2141 }
2142
xfrm_if_id_put(struct sk_buff * skb,__u32 if_id)2143 static inline int xfrm_if_id_put(struct sk_buff *skb, __u32 if_id)
2144 {
2145 int ret = 0;
2146
2147 if (if_id)
2148 ret = nla_put_u32(skb, XFRMA_IF_ID, if_id);
2149 return ret;
2150 }
2151
xfrm_tunnel_check(struct sk_buff * skb,struct xfrm_state * x,unsigned int family)2152 static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x,
2153 unsigned int family)
2154 {
2155 bool tunnel = false;
2156
2157 switch(family) {
2158 case AF_INET:
2159 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4)
2160 tunnel = true;
2161 break;
2162 case AF_INET6:
2163 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6)
2164 tunnel = true;
2165 break;
2166 }
2167 if (tunnel && !(x->outer_mode.flags & XFRM_MODE_FLAG_TUNNEL))
2168 return -EINVAL;
2169
2170 return 0;
2171 }
2172
2173 extern const int xfrm_msg_min[XFRM_NR_MSGTYPES];
2174 extern const struct nla_policy xfrma_policy[XFRMA_MAX+1];
2175
2176 struct xfrm_translator {
2177 /* Allocate frag_list and put compat translation there */
2178 int (*alloc_compat)(struct sk_buff *skb, const struct nlmsghdr *src);
2179
2180 /* Allocate nlmsg with 64-bit translaton of received 32-bit message */
2181 struct nlmsghdr *(*rcv_msg_compat)(const struct nlmsghdr *nlh,
2182 int maxtype, const struct nla_policy *policy,
2183 struct netlink_ext_ack *extack);
2184
2185 /* Translate 32-bit user_policy from sockptr */
2186 int (*xlate_user_policy_sockptr)(u8 **pdata32, int optlen);
2187
2188 struct module *owner;
2189 };
2190
2191 #if IS_ENABLED(CONFIG_XFRM_USER_COMPAT)
2192 extern int xfrm_register_translator(struct xfrm_translator *xtr);
2193 extern int xfrm_unregister_translator(struct xfrm_translator *xtr);
2194 extern struct xfrm_translator *xfrm_get_translator(void);
2195 extern void xfrm_put_translator(struct xfrm_translator *xtr);
2196 #else
xfrm_get_translator(void)2197 static inline struct xfrm_translator *xfrm_get_translator(void)
2198 {
2199 return NULL;
2200 }
xfrm_put_translator(struct xfrm_translator * xtr)2201 static inline void xfrm_put_translator(struct xfrm_translator *xtr)
2202 {
2203 }
2204 #endif
2205
2206 #if IS_ENABLED(CONFIG_IPV6)
xfrm6_local_dontfrag(const struct sock * sk)2207 static inline bool xfrm6_local_dontfrag(const struct sock *sk)
2208 {
2209 int proto;
2210
2211 if (!sk || sk->sk_family != AF_INET6)
2212 return false;
2213
2214 proto = sk->sk_protocol;
2215 if (proto == IPPROTO_UDP || proto == IPPROTO_RAW)
2216 return inet6_test_bit(DONTFRAG, sk);
2217
2218 return false;
2219 }
2220 #endif
2221
2222 #if (IS_BUILTIN(CONFIG_XFRM_INTERFACE) && IS_ENABLED(CONFIG_DEBUG_INFO_BTF)) || \
2223 (IS_MODULE(CONFIG_XFRM_INTERFACE) && IS_ENABLED(CONFIG_DEBUG_INFO_BTF_MODULES))
2224
2225 extern struct metadata_dst __percpu *xfrm_bpf_md_dst;
2226
2227 int register_xfrm_interface_bpf(void);
2228
2229 #else
2230
register_xfrm_interface_bpf(void)2231 static inline int register_xfrm_interface_bpf(void)
2232 {
2233 return 0;
2234 }
2235
2236 #endif
2237
2238 #if IS_ENABLED(CONFIG_DEBUG_INFO_BTF)
2239 int register_xfrm_state_bpf(void);
2240 #else
register_xfrm_state_bpf(void)2241 static inline int register_xfrm_state_bpf(void)
2242 {
2243 return 0;
2244 }
2245 #endif
2246
2247 int xfrm_nat_keepalive_init(unsigned short family);
2248 void xfrm_nat_keepalive_fini(unsigned short family);
2249 int xfrm_nat_keepalive_net_init(struct net *net);
2250 int xfrm_nat_keepalive_net_fini(struct net *net);
2251 void xfrm_nat_keepalive_state_updated(struct xfrm_state *x);
2252
2253 #endif /* _NET_XFRM_H */
2254