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1#ifndef _NET_XFRM_H
2#define _NET_XFRM_H
3
4#include <linux/compiler.h>
5#include <linux/xfrm.h>
6#include <linux/spinlock.h>
7#include <linux/list.h>
8#include <linux/skbuff.h>
9#include <linux/socket.h>
10#include <linux/pfkeyv2.h>
11#include <linux/ipsec.h>
12#include <linux/in6.h>
13#include <linux/mutex.h>
14#include <linux/audit.h>
15#include <linux/slab.h>
16
17#include <net/sock.h>
18#include <net/dst.h>
19#include <net/ip.h>
20#include <net/route.h>
21#include <net/ipv6.h>
22#include <net/ip6_fib.h>
23#include <net/flow.h>
24
25#include <linux/interrupt.h>
26
27#ifdef CONFIG_XFRM_STATISTICS
28#include <net/snmp.h>
29#endif
30
31#define XFRM_PROTO_ESP 50
32#define XFRM_PROTO_AH 51
33#define XFRM_PROTO_COMP 108
34#define XFRM_PROTO_IPIP 4
35#define XFRM_PROTO_IPV6 41
36#define XFRM_PROTO_ROUTING IPPROTO_ROUTING
37#define XFRM_PROTO_DSTOPTS IPPROTO_DSTOPTS
38
39#define XFRM_ALIGN4(len) (((len) + 3) & ~3)
40#define XFRM_ALIGN8(len) (((len) + 7) & ~7)
41#define MODULE_ALIAS_XFRM_MODE(family, encap) \
42 MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap))
43#define MODULE_ALIAS_XFRM_TYPE(family, proto) \
44 MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto))
45
46#ifdef CONFIG_XFRM_STATISTICS
47#define XFRM_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.xfrm_statistics, field)
48#define XFRM_INC_STATS_BH(net, field) SNMP_INC_STATS_BH((net)->mib.xfrm_statistics, field)
49#define XFRM_INC_STATS_USER(net, field) SNMP_INC_STATS_USER((net)-mib.xfrm_statistics, field)
50#else
51#define XFRM_INC_STATS(net, field) ((void)(net))
52#define XFRM_INC_STATS_BH(net, field) ((void)(net))
53#define XFRM_INC_STATS_USER(net, field) ((void)(net))
54#endif
55
56
57/* Organization of SPD aka "XFRM rules"
58 ------------------------------------
59
60 Basic objects:
61 - policy rule, struct xfrm_policy (=SPD entry)
62 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
63 - instance of a transformer, struct xfrm_state (=SA)
64 - template to clone xfrm_state, struct xfrm_tmpl
65
66 SPD is plain linear list of xfrm_policy rules, ordered by priority.
67 (To be compatible with existing pfkeyv2 implementations,
68 many rules with priority of 0x7fffffff are allowed to exist and
69 such rules are ordered in an unpredictable way, thanks to bsd folks.)
70
71 Lookup is plain linear search until the first match with selector.
72
73 If "action" is "block", then we prohibit the flow, otherwise:
74 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
75 policy entry has list of up to XFRM_MAX_DEPTH transformations,
76 described by templates xfrm_tmpl. Each template is resolved
77 to a complete xfrm_state (see below) and we pack bundle of transformations
78 to a dst_entry returned to requestor.
79
80 dst -. xfrm .-> xfrm_state #1
81 |---. child .-> dst -. xfrm .-> xfrm_state #2
82 |---. child .-> dst -. xfrm .-> xfrm_state #3
83 |---. child .-> NULL
84
85 Bundles are cached at xrfm_policy struct (field ->bundles).
86
87
88 Resolution of xrfm_tmpl
89 -----------------------
90 Template contains:
91 1. ->mode Mode: transport or tunnel
92 2. ->id.proto Protocol: AH/ESP/IPCOMP
93 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode.
94 Q: allow to resolve security gateway?
95 4. ->id.spi If not zero, static SPI.
96 5. ->saddr Local tunnel endpoint, ignored for transport mode.
97 6. ->algos List of allowed algos. Plain bitmask now.
98 Q: ealgos, aalgos, calgos. What a mess...
99 7. ->share Sharing mode.
100 Q: how to implement private sharing mode? To add struct sock* to
101 flow id?
102
103 Having this template we search through SAD searching for entries
104 with appropriate mode/proto/algo, permitted by selector.
105 If no appropriate entry found, it is requested from key manager.
106
107 PROBLEMS:
108 Q: How to find all the bundles referring to a physical path for
109 PMTU discovery? Seems, dst should contain list of all parents...
110 and enter to infinite locking hierarchy disaster.
111 No! It is easier, we will not search for them, let them find us.
112 We add genid to each dst plus pointer to genid of raw IP route,
113 pmtu disc will update pmtu on raw IP route and increase its genid.
114 dst_check() will see this for top level and trigger resyncing
115 metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
116 */
117
118struct xfrm_state_walk {
119 struct list_head all;
120 u8 state;
121 u8 dying;
122 u8 proto;
123 u32 seq;
124 struct xfrm_address_filter *filter;
125};
126
127/* Full description of state of transformer. */
128struct xfrm_state {
129 possible_net_t xs_net;
130 union {
131 struct hlist_node gclist;
132 struct hlist_node bydst;
133 };
134 struct hlist_node bysrc;
135 struct hlist_node byspi;
136
137 atomic_t refcnt;
138 spinlock_t lock;
139
140 struct xfrm_id id;
141 struct xfrm_selector sel;
142 struct xfrm_mark mark;
143 u32 tfcpad;
144
145 u32 genid;
146
147 /* Key manager bits */
148 struct xfrm_state_walk km;
149
150 /* Parameters of this state. */
151 struct {
152 u32 reqid;
153 u8 mode;
154 u8 replay_window;
155 u8 aalgo, ealgo, calgo;
156 u8 flags;
157 u16 family;
158 xfrm_address_t saddr;
159 int header_len;
160 int trailer_len;
161 u32 extra_flags;
162 } props;
163
164 struct xfrm_lifetime_cfg lft;
165
166 /* Data for transformer */
167 struct xfrm_algo_auth *aalg;
168 struct xfrm_algo *ealg;
169 struct xfrm_algo *calg;
170 struct xfrm_algo_aead *aead;
171 const char *geniv;
172
173 /* Data for encapsulator */
174 struct xfrm_encap_tmpl *encap;
175
176 /* Data for care-of address */
177 xfrm_address_t *coaddr;
178
179 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
180 struct xfrm_state *tunnel;
181
182 /* If a tunnel, number of users + 1 */
183 atomic_t tunnel_users;
184
185 /* State for replay detection */
186 struct xfrm_replay_state replay;
187 struct xfrm_replay_state_esn *replay_esn;
188
189 /* Replay detection state at the time we sent the last notification */
190 struct xfrm_replay_state preplay;
191 struct xfrm_replay_state_esn *preplay_esn;
192
193 /* The functions for replay detection. */
194 struct xfrm_replay *repl;
195
196 /* internal flag that only holds state for delayed aevent at the
197 * moment
198 */
199 u32 xflags;
200
201 /* Replay detection notification settings */
202 u32 replay_maxage;
203 u32 replay_maxdiff;
204
205 /* Replay detection notification timer */
206 struct timer_list rtimer;
207
208 /* Statistics */
209 struct xfrm_stats stats;
210
211 struct xfrm_lifetime_cur curlft;
212 struct tasklet_hrtimer mtimer;
213
214 /* used to fix curlft->add_time when changing date */
215 long saved_tmo;
216
217 /* Last used time */
218 unsigned long lastused;
219
220 /* Reference to data common to all the instances of this
221 * transformer. */
222 const struct xfrm_type *type;
223 struct xfrm_mode *inner_mode;
224 struct xfrm_mode *inner_mode_iaf;
225 struct xfrm_mode *outer_mode;
226
227 /* Security context */
228 struct xfrm_sec_ctx *security;
229
230 /* Private data of this transformer, format is opaque,
231 * interpreted by xfrm_type methods. */
232 void *data;
233};
234
235static inline struct net *xs_net(struct xfrm_state *x)
236{
237 return read_pnet(&x->xs_net);
238}
239
240/* xflags - make enum if more show up */
241#define XFRM_TIME_DEFER 1
242#define XFRM_SOFT_EXPIRE 2
243
244enum {
245 XFRM_STATE_VOID,
246 XFRM_STATE_ACQ,
247 XFRM_STATE_VALID,
248 XFRM_STATE_ERROR,
249 XFRM_STATE_EXPIRED,
250 XFRM_STATE_DEAD
251};
252
253/* callback structure passed from either netlink or pfkey */
254struct km_event {
255 union {
256 u32 hard;
257 u32 proto;
258 u32 byid;
259 u32 aevent;
260 u32 type;
261 } data;
262
263 u32 seq;
264 u32 portid;
265 u32 event;
266 struct net *net;
267};
268
269struct xfrm_replay {
270 void (*advance)(struct xfrm_state *x, __be32 net_seq);
271 int (*check)(struct xfrm_state *x,
272 struct sk_buff *skb,
273 __be32 net_seq);
274 int (*recheck)(struct xfrm_state *x,
275 struct sk_buff *skb,
276 __be32 net_seq);
277 void (*notify)(struct xfrm_state *x, int event);
278 int (*overflow)(struct xfrm_state *x, struct sk_buff *skb);
279};
280
281struct net_device;
282struct xfrm_type;
283struct xfrm_dst;
284struct xfrm_policy_afinfo {
285 unsigned short family;
286 struct dst_ops *dst_ops;
287 void (*garbage_collect)(struct net *net);
288 struct dst_entry *(*dst_lookup)(struct net *net,
289 int tos, int oif,
290 const xfrm_address_t *saddr,
291 const xfrm_address_t *daddr);
292 int (*get_saddr)(struct net *net, int oif,
293 xfrm_address_t *saddr,
294 xfrm_address_t *daddr);
295 void (*decode_session)(struct sk_buff *skb,
296 struct flowi *fl,
297 int reverse);
298 int (*get_tos)(const struct flowi *fl);
299 int (*init_path)(struct xfrm_dst *path,
300 struct dst_entry *dst,
301 int nfheader_len);
302 int (*fill_dst)(struct xfrm_dst *xdst,
303 struct net_device *dev,
304 const struct flowi *fl);
305 struct dst_entry *(*blackhole_route)(struct net *net, struct dst_entry *orig);
306};
307
308int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
309int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
310void km_policy_notify(struct xfrm_policy *xp, int dir,
311 const struct km_event *c);
312void km_state_notify(struct xfrm_state *x, const struct km_event *c);
313
314struct xfrm_tmpl;
315int km_query(struct xfrm_state *x, struct xfrm_tmpl *t,
316 struct xfrm_policy *pol);
317void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
318int __xfrm_state_delete(struct xfrm_state *x);
319
320struct xfrm_state_afinfo {
321 unsigned int family;
322 unsigned int proto;
323 __be16 eth_proto;
324 struct module *owner;
325 const struct xfrm_type *type_map[IPPROTO_MAX];
326 struct xfrm_mode *mode_map[XFRM_MODE_MAX];
327 int (*init_flags)(struct xfrm_state *x);
328 void (*init_tempsel)(struct xfrm_selector *sel,
329 const struct flowi *fl);
330 void (*init_temprop)(struct xfrm_state *x,
331 const struct xfrm_tmpl *tmpl,
332 const xfrm_address_t *daddr,
333 const xfrm_address_t *saddr);
334 int (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n);
335 int (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n);
336 int (*output)(struct net *net, struct sock *sk, struct sk_buff *skb);
337 int (*output_finish)(struct sock *sk, struct sk_buff *skb);
338 int (*extract_input)(struct xfrm_state *x,
339 struct sk_buff *skb);
340 int (*extract_output)(struct xfrm_state *x,
341 struct sk_buff *skb);
342 int (*transport_finish)(struct sk_buff *skb,
343 int async);
344 void (*local_error)(struct sk_buff *skb, u32 mtu);
345};
346
347int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
348int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
349struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family);
350void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo);
351
352struct xfrm_input_afinfo {
353 unsigned int family;
354 struct module *owner;
355 int (*callback)(struct sk_buff *skb, u8 protocol,
356 int err);
357};
358
359int xfrm_input_register_afinfo(struct xfrm_input_afinfo *afinfo);
360int xfrm_input_unregister_afinfo(struct xfrm_input_afinfo *afinfo);
361
362void xfrm_state_delete_tunnel(struct xfrm_state *x);
363
364struct xfrm_type {
365 char *description;
366 struct module *owner;
367 u8 proto;
368 u8 flags;
369#define XFRM_TYPE_NON_FRAGMENT 1
370#define XFRM_TYPE_REPLAY_PROT 2
371#define XFRM_TYPE_LOCAL_COADDR 4
372#define XFRM_TYPE_REMOTE_COADDR 8
373
374 int (*init_state)(struct xfrm_state *x);
375 void (*destructor)(struct xfrm_state *);
376 int (*input)(struct xfrm_state *, struct sk_buff *skb);
377 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
378 int (*reject)(struct xfrm_state *, struct sk_buff *,
379 const struct flowi *);
380 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
381 /* Estimate maximal size of result of transformation of a dgram */
382 u32 (*get_mtu)(struct xfrm_state *, int size);
383};
384
385int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
386int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
387
388struct xfrm_mode {
389 /*
390 * Remove encapsulation header.
391 *
392 * The IP header will be moved over the top of the encapsulation
393 * header.
394 *
395 * On entry, the transport header shall point to where the IP header
396 * should be and the network header shall be set to where the IP
397 * header currently is. skb->data shall point to the start of the
398 * payload.
399 */
400 int (*input2)(struct xfrm_state *x, struct sk_buff *skb);
401
402 /*
403 * This is the actual input entry point.
404 *
405 * For transport mode and equivalent this would be identical to
406 * input2 (which does not need to be set). While tunnel mode
407 * and equivalent would set this to the tunnel encapsulation function
408 * xfrm4_prepare_input that would in turn call input2.
409 */
410 int (*input)(struct xfrm_state *x, struct sk_buff *skb);
411
412 /*
413 * Add encapsulation header.
414 *
415 * On exit, the transport header will be set to the start of the
416 * encapsulation header to be filled in by x->type->output and
417 * the mac header will be set to the nextheader (protocol for
418 * IPv4) field of the extension header directly preceding the
419 * encapsulation header, or in its absence, that of the top IP
420 * header. The value of the network header will always point
421 * to the top IP header while skb->data will point to the payload.
422 */
423 int (*output2)(struct xfrm_state *x,struct sk_buff *skb);
424
425 /*
426 * This is the actual output entry point.
427 *
428 * For transport mode and equivalent this would be identical to
429 * output2 (which does not need to be set). While tunnel mode
430 * and equivalent would set this to a tunnel encapsulation function
431 * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn
432 * call output2.
433 */
434 int (*output)(struct xfrm_state *x, struct sk_buff *skb);
435
436 struct xfrm_state_afinfo *afinfo;
437 struct module *owner;
438 unsigned int encap;
439 int flags;
440};
441
442/* Flags for xfrm_mode. */
443enum {
444 XFRM_MODE_FLAG_TUNNEL = 1,
445};
446
447int xfrm_register_mode(struct xfrm_mode *mode, int family);
448int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
449
450static inline int xfrm_af2proto(unsigned int family)
451{
452 switch(family) {
453 case AF_INET:
454 return IPPROTO_IPIP;
455 case AF_INET6:
456 return IPPROTO_IPV6;
457 default:
458 return 0;
459 }
460}
461
462static inline struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
463{
464 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
465 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
466 return x->inner_mode;
467 else
468 return x->inner_mode_iaf;
469}
470
471struct xfrm_tmpl {
472/* id in template is interpreted as:
473 * daddr - destination of tunnel, may be zero for transport mode.
474 * spi - zero to acquire spi. Not zero if spi is static, then
475 * daddr must be fixed too.
476 * proto - AH/ESP/IPCOMP
477 */
478 struct xfrm_id id;
479
480/* Source address of tunnel. Ignored, if it is not a tunnel. */
481 xfrm_address_t saddr;
482
483 unsigned short encap_family;
484
485 u32 reqid;
486
487/* Mode: transport, tunnel etc. */
488 u8 mode;
489
490/* Sharing mode: unique, this session only, this user only etc. */
491 u8 share;
492
493/* May skip this transfomration if no SA is found */
494 u8 optional;
495
496/* Skip aalgos/ealgos/calgos checks. */
497 u8 allalgs;
498
499/* Bit mask of algos allowed for acquisition */
500 u32 aalgos;
501 u32 ealgos;
502 u32 calgos;
503};
504
505#define XFRM_MAX_DEPTH 6
506
507struct xfrm_policy_walk_entry {
508 struct list_head all;
509 u8 dead;
510};
511
512struct xfrm_policy_walk {
513 struct xfrm_policy_walk_entry walk;
514 u8 type;
515 u32 seq;
516};
517
518struct xfrm_policy_queue {
519 struct sk_buff_head hold_queue;
520 struct timer_list hold_timer;
521 unsigned long timeout;
522};
523
524struct xfrm_policy {
525 possible_net_t xp_net;
526 struct hlist_node bydst;
527 struct hlist_node byidx;
528
529 /* This lock only affects elements except for entry. */
530 rwlock_t lock;
531 atomic_t refcnt;
532 struct timer_list timer;
533
534 struct flow_cache_object flo;
535 atomic_t genid;
536 u32 priority;
537 u32 index;
538 struct xfrm_mark mark;
539 struct xfrm_selector selector;
540 struct xfrm_lifetime_cfg lft;
541 struct xfrm_lifetime_cur curlft;
542 struct xfrm_policy_walk_entry walk;
543 struct xfrm_policy_queue polq;
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 rcu_head rcu;
552};
553
554static inline struct net *xp_net(const struct xfrm_policy *xp)
555{
556 return read_pnet(&xp->xp_net);
557}
558
559struct xfrm_kmaddress {
560 xfrm_address_t local;
561 xfrm_address_t remote;
562 u32 reserved;
563 u16 family;
564};
565
566struct xfrm_migrate {
567 xfrm_address_t old_daddr;
568 xfrm_address_t old_saddr;
569 xfrm_address_t new_daddr;
570 xfrm_address_t new_saddr;
571 u8 proto;
572 u8 mode;
573 u16 reserved;
574 u32 reqid;
575 u16 old_family;
576 u16 new_family;
577};
578
579#define XFRM_KM_TIMEOUT 30
580/* what happened */
581#define XFRM_REPLAY_UPDATE XFRM_AE_CR
582#define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
583
584/* default aevent timeout in units of 100ms */
585#define XFRM_AE_ETIME 10
586/* Async Event timer multiplier */
587#define XFRM_AE_ETH_M 10
588/* default seq threshold size */
589#define XFRM_AE_SEQT_SIZE 2
590
591struct xfrm_mgr {
592 struct list_head list;
593 char *id;
594 int (*notify)(struct xfrm_state *x, const struct km_event *c);
595 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp);
596 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
597 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
598 int (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c);
599 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
600 int (*migrate)(const struct xfrm_selector *sel,
601 u8 dir, u8 type,
602 const struct xfrm_migrate *m,
603 int num_bundles,
604 const struct xfrm_kmaddress *k);
605 bool (*is_alive)(const struct km_event *c);
606};
607
608int xfrm_register_km(struct xfrm_mgr *km);
609int xfrm_unregister_km(struct xfrm_mgr *km);
610
611struct xfrm_tunnel_skb_cb {
612 union {
613 struct inet_skb_parm h4;
614 struct inet6_skb_parm h6;
615 } header;
616
617 union {
618 struct ip_tunnel *ip4;
619 struct ip6_tnl *ip6;
620 } tunnel;
621};
622
623#define XFRM_TUNNEL_SKB_CB(__skb) ((struct xfrm_tunnel_skb_cb *)&((__skb)->cb[0]))
624
625/*
626 * This structure is used for the duration where packets are being
627 * transformed by IPsec. As soon as the packet leaves IPsec the
628 * area beyond the generic IP part may be overwritten.
629 */
630struct xfrm_skb_cb {
631 struct xfrm_tunnel_skb_cb header;
632
633 /* Sequence number for replay protection. */
634 union {
635 struct {
636 __u32 low;
637 __u32 hi;
638 } output;
639 struct {
640 __be32 low;
641 __be32 hi;
642 } input;
643 } seq;
644};
645
646#define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
647
648/*
649 * This structure is used by the afinfo prepare_input/prepare_output functions
650 * to transmit header information to the mode input/output functions.
651 */
652struct xfrm_mode_skb_cb {
653 struct xfrm_tunnel_skb_cb header;
654
655 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
656 __be16 id;
657 __be16 frag_off;
658
659 /* IP header length (excluding options or extension headers). */
660 u8 ihl;
661
662 /* TOS for IPv4, class for IPv6. */
663 u8 tos;
664
665 /* TTL for IPv4, hop limitfor IPv6. */
666 u8 ttl;
667
668 /* Protocol for IPv4, NH for IPv6. */
669 u8 protocol;
670
671 /* Option length for IPv4, zero for IPv6. */
672 u8 optlen;
673
674 /* Used by IPv6 only, zero for IPv4. */
675 u8 flow_lbl[3];
676};
677
678#define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
679
680/*
681 * This structure is used by the input processing to locate the SPI and
682 * related information.
683 */
684struct xfrm_spi_skb_cb {
685 struct xfrm_tunnel_skb_cb header;
686
687 unsigned int daddroff;
688 unsigned int family;
689};
690
691#define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
692
693#ifdef CONFIG_AUDITSYSCALL
694static inline struct audit_buffer *xfrm_audit_start(const char *op)
695{
696 struct audit_buffer *audit_buf = NULL;
697
698 if (audit_enabled == 0)
699 return NULL;
700 audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC,
701 AUDIT_MAC_IPSEC_EVENT);
702 if (audit_buf == NULL)
703 return NULL;
704 audit_log_format(audit_buf, "op=%s", op);
705 return audit_buf;
706}
707
708static inline void xfrm_audit_helper_usrinfo(bool task_valid,
709 struct audit_buffer *audit_buf)
710{
711 const unsigned int auid = from_kuid(&init_user_ns, task_valid ?
712 audit_get_loginuid(current) :
713 INVALID_UID);
714 const unsigned int ses = task_valid ? audit_get_sessionid(current) :
715 (unsigned int) -1;
716
717 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
718 audit_log_task_context(audit_buf);
719}
720
721void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid);
722void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
723 bool task_valid);
724void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid);
725void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid);
726void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
727 struct sk_buff *skb);
728void xfrm_audit_state_replay(struct xfrm_state *x, struct sk_buff *skb,
729 __be32 net_seq);
730void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
731void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, __be32 net_spi,
732 __be32 net_seq);
733void xfrm_audit_state_icvfail(struct xfrm_state *x, struct sk_buff *skb,
734 u8 proto);
735#else
736
737static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
738 bool task_valid)
739{
740}
741
742static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
743 bool task_valid)
744{
745}
746
747static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
748 bool task_valid)
749{
750}
751
752static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
753 bool task_valid)
754{
755}
756
757static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
758 struct sk_buff *skb)
759{
760}
761
762static inline void xfrm_audit_state_replay(struct xfrm_state *x,
763 struct sk_buff *skb, __be32 net_seq)
764{
765}
766
767static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
768 u16 family)
769{
770}
771
772static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
773 __be32 net_spi, __be32 net_seq)
774{
775}
776
777static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
778 struct sk_buff *skb, u8 proto)
779{
780}
781#endif /* CONFIG_AUDITSYSCALL */
782
783static inline void xfrm_pol_hold(struct xfrm_policy *policy)
784{
785 if (likely(policy != NULL))
786 atomic_inc(&policy->refcnt);
787}
788
789void xfrm_policy_destroy(struct xfrm_policy *policy);
790
791static inline void xfrm_pol_put(struct xfrm_policy *policy)
792{
793 if (atomic_dec_and_test(&policy->refcnt))
794 xfrm_policy_destroy(policy);
795}
796
797static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
798{
799 int i;
800 for (i = npols - 1; i >= 0; --i)
801 xfrm_pol_put(pols[i]);
802}
803
804void __xfrm_state_destroy(struct xfrm_state *);
805
806static inline void __xfrm_state_put(struct xfrm_state *x)
807{
808 atomic_dec(&x->refcnt);
809}
810
811static inline void xfrm_state_put(struct xfrm_state *x)
812{
813 if (atomic_dec_and_test(&x->refcnt))
814 __xfrm_state_destroy(x);
815}
816
817static inline void xfrm_state_hold(struct xfrm_state *x)
818{
819 atomic_inc(&x->refcnt);
820}
821
822static inline bool addr_match(const void *token1, const void *token2,
823 int prefixlen)
824{
825 const __be32 *a1 = token1;
826 const __be32 *a2 = token2;
827 int pdw;
828 int pbi;
829
830 pdw = prefixlen >> 5; /* num of whole u32 in prefix */
831 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
832
833 if (pdw)
834 if (memcmp(a1, a2, pdw << 2))
835 return false;
836
837 if (pbi) {
838 __be32 mask;
839
840 mask = htonl((0xffffffff) << (32 - pbi));
841
842 if ((a1[pdw] ^ a2[pdw]) & mask)
843 return false;
844 }
845
846 return true;
847}
848
849static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen)
850{
851 /* C99 6.5.7 (3): u32 << 32 is undefined behaviour */
852 if (prefixlen == 0)
853 return true;
854 return !((a1 ^ a2) & htonl(0xFFFFFFFFu << (32 - prefixlen)));
855}
856
857static __inline__
858__be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli)
859{
860 __be16 port;
861 switch(fl->flowi_proto) {
862 case IPPROTO_TCP:
863 case IPPROTO_UDP:
864 case IPPROTO_UDPLITE:
865 case IPPROTO_SCTP:
866 port = uli->ports.sport;
867 break;
868 case IPPROTO_ICMP:
869 case IPPROTO_ICMPV6:
870 port = htons(uli->icmpt.type);
871 break;
872 case IPPROTO_MH:
873 port = htons(uli->mht.type);
874 break;
875 case IPPROTO_GRE:
876 port = htons(ntohl(uli->gre_key) >> 16);
877 break;
878 default:
879 port = 0; /*XXX*/
880 }
881 return port;
882}
883
884static __inline__
885__be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli)
886{
887 __be16 port;
888 switch(fl->flowi_proto) {
889 case IPPROTO_TCP:
890 case IPPROTO_UDP:
891 case IPPROTO_UDPLITE:
892 case IPPROTO_SCTP:
893 port = uli->ports.dport;
894 break;
895 case IPPROTO_ICMP:
896 case IPPROTO_ICMPV6:
897 port = htons(uli->icmpt.code);
898 break;
899 case IPPROTO_GRE:
900 port = htons(ntohl(uli->gre_key) & 0xffff);
901 break;
902 default:
903 port = 0; /*XXX*/
904 }
905 return port;
906}
907
908bool xfrm_selector_match(const struct xfrm_selector *sel,
909 const struct flowi *fl, unsigned short family);
910
911#ifdef CONFIG_SECURITY_NETWORK_XFRM
912/* If neither has a context --> match
913 * Otherwise, both must have a context and the sids, doi, alg must match
914 */
915static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
916{
917 return ((!s1 && !s2) ||
918 (s1 && s2 &&
919 (s1->ctx_sid == s2->ctx_sid) &&
920 (s1->ctx_doi == s2->ctx_doi) &&
921 (s1->ctx_alg == s2->ctx_alg)));
922}
923#else
924static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
925{
926 return true;
927}
928#endif
929
930/* A struct encoding bundle of transformations to apply to some set of flow.
931 *
932 * dst->child points to the next element of bundle.
933 * dst->xfrm points to an instanse of transformer.
934 *
935 * Due to unfortunate limitations of current routing cache, which we
936 * have no time to fix, it mirrors struct rtable and bound to the same
937 * routing key, including saddr,daddr. However, we can have many of
938 * bundles differing by session id. All the bundles grow from a parent
939 * policy rule.
940 */
941struct xfrm_dst {
942 union {
943 struct dst_entry dst;
944 struct rtable rt;
945 struct rt6_info rt6;
946 } u;
947 struct dst_entry *route;
948 struct flow_cache_object flo;
949 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
950 int num_pols, num_xfrms;
951#ifdef CONFIG_XFRM_SUB_POLICY
952 struct flowi *origin;
953 struct xfrm_selector *partner;
954#endif
955 u32 xfrm_genid;
956 u32 policy_genid;
957 u32 route_mtu_cached;
958 u32 child_mtu_cached;
959 u32 route_cookie;
960 u32 path_cookie;
961};
962
963#ifdef CONFIG_XFRM
964static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
965{
966 xfrm_pols_put(xdst->pols, xdst->num_pols);
967 dst_release(xdst->route);
968 if (likely(xdst->u.dst.xfrm))
969 xfrm_state_put(xdst->u.dst.xfrm);
970#ifdef CONFIG_XFRM_SUB_POLICY
971 kfree(xdst->origin);
972 xdst->origin = NULL;
973 kfree(xdst->partner);
974 xdst->partner = NULL;
975#endif
976}
977#endif
978
979void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
980
981struct sec_path {
982 atomic_t refcnt;
983 int len;
984 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
985};
986
987static inline int secpath_exists(struct sk_buff *skb)
988{
989#ifdef CONFIG_XFRM
990 return skb->sp != NULL;
991#else
992 return 0;
993#endif
994}
995
996static inline struct sec_path *
997secpath_get(struct sec_path *sp)
998{
999 if (sp)
1000 atomic_inc(&sp->refcnt);
1001 return sp;
1002}
1003
1004void __secpath_destroy(struct sec_path *sp);
1005
1006static inline void
1007secpath_put(struct sec_path *sp)
1008{
1009 if (sp && atomic_dec_and_test(&sp->refcnt))
1010 __secpath_destroy(sp);
1011}
1012
1013struct sec_path *secpath_dup(struct sec_path *src);
1014
1015static inline void
1016secpath_reset(struct sk_buff *skb)
1017{
1018#ifdef CONFIG_XFRM
1019 secpath_put(skb->sp);
1020 skb->sp = NULL;
1021#endif
1022}
1023
1024static inline int
1025xfrm_addr_any(const xfrm_address_t *addr, unsigned short family)
1026{
1027 switch (family) {
1028 case AF_INET:
1029 return addr->a4 == 0;
1030 case AF_INET6:
1031 return ipv6_addr_any(&addr->in6);
1032 }
1033 return 0;
1034}
1035
1036static inline int
1037__xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1038{
1039 return (tmpl->saddr.a4 &&
1040 tmpl->saddr.a4 != x->props.saddr.a4);
1041}
1042
1043static inline int
1044__xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1045{
1046 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
1047 !ipv6_addr_equal((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
1048}
1049
1050static inline int
1051xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family)
1052{
1053 switch (family) {
1054 case AF_INET:
1055 return __xfrm4_state_addr_cmp(tmpl, x);
1056 case AF_INET6:
1057 return __xfrm6_state_addr_cmp(tmpl, x);
1058 }
1059 return !0;
1060}
1061
1062#ifdef CONFIG_XFRM
1063int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb,
1064 unsigned short family);
1065
1066static inline int __xfrm_policy_check2(struct sock *sk, int dir,
1067 struct sk_buff *skb,
1068 unsigned int family, int reverse)
1069{
1070 struct net *net = dev_net(skb->dev);
1071 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
1072
1073 if (sk && sk->sk_policy[XFRM_POLICY_IN])
1074 return __xfrm_policy_check(sk, ndir, skb, family);
1075
1076 return (!net->xfrm.policy_count[dir] && !skb->sp) ||
1077 (skb_dst(skb)->flags & DST_NOPOLICY) ||
1078 __xfrm_policy_check(sk, ndir, skb, family);
1079}
1080
1081static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1082{
1083 return __xfrm_policy_check2(sk, dir, skb, family, 0);
1084}
1085
1086static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1087{
1088 return xfrm_policy_check(sk, dir, skb, AF_INET);
1089}
1090
1091static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1092{
1093 return xfrm_policy_check(sk, dir, skb, AF_INET6);
1094}
1095
1096static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1097 struct sk_buff *skb)
1098{
1099 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1100}
1101
1102static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1103 struct sk_buff *skb)
1104{
1105 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1106}
1107
1108int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1109 unsigned int family, int reverse);
1110
1111static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1112 unsigned int family)
1113{
1114 return __xfrm_decode_session(skb, fl, family, 0);
1115}
1116
1117static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1118 struct flowi *fl,
1119 unsigned int family)
1120{
1121 return __xfrm_decode_session(skb, fl, family, 1);
1122}
1123
1124int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1125
1126static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1127{
1128 struct net *net = dev_net(skb->dev);
1129
1130 return !net->xfrm.policy_count[XFRM_POLICY_OUT] ||
1131 (skb_dst(skb)->flags & DST_NOXFRM) ||
1132 __xfrm_route_forward(skb, family);
1133}
1134
1135static inline int xfrm4_route_forward(struct sk_buff *skb)
1136{
1137 return xfrm_route_forward(skb, AF_INET);
1138}
1139
1140static inline int xfrm6_route_forward(struct sk_buff *skb)
1141{
1142 return xfrm_route_forward(skb, AF_INET6);
1143}
1144
1145int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk);
1146
1147static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk)
1148{
1149 sk->sk_policy[0] = NULL;
1150 sk->sk_policy[1] = NULL;
1151 if (unlikely(osk->sk_policy[0] || osk->sk_policy[1]))
1152 return __xfrm_sk_clone_policy(sk, osk);
1153 return 0;
1154}
1155
1156int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1157
1158static inline void xfrm_sk_free_policy(struct sock *sk)
1159{
1160 struct xfrm_policy *pol;
1161
1162 pol = rcu_dereference_protected(sk->sk_policy[0], 1);
1163 if (unlikely(pol != NULL)) {
1164 xfrm_policy_delete(pol, XFRM_POLICY_MAX);
1165 sk->sk_policy[0] = NULL;
1166 }
1167 pol = rcu_dereference_protected(sk->sk_policy[1], 1);
1168 if (unlikely(pol != NULL)) {
1169 xfrm_policy_delete(pol, XFRM_POLICY_MAX+1);
1170 sk->sk_policy[1] = NULL;
1171 }
1172}
1173
1174void xfrm_garbage_collect(struct net *net);
1175
1176#else
1177
1178static inline void xfrm_sk_free_policy(struct sock *sk) {}
1179static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) { return 0; }
1180static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1181static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1182static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1183{
1184 return 1;
1185}
1186static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1187{
1188 return 1;
1189}
1190static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1191{
1192 return 1;
1193}
1194static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1195 struct flowi *fl,
1196 unsigned int family)
1197{
1198 return -ENOSYS;
1199}
1200static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1201 struct sk_buff *skb)
1202{
1203 return 1;
1204}
1205static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1206 struct sk_buff *skb)
1207{
1208 return 1;
1209}
1210static inline void xfrm_garbage_collect(struct net *net)
1211{
1212}
1213#endif
1214
1215static __inline__
1216xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family)
1217{
1218 switch (family){
1219 case AF_INET:
1220 return (xfrm_address_t *)&fl->u.ip4.daddr;
1221 case AF_INET6:
1222 return (xfrm_address_t *)&fl->u.ip6.daddr;
1223 }
1224 return NULL;
1225}
1226
1227static __inline__
1228xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family)
1229{
1230 switch (family){
1231 case AF_INET:
1232 return (xfrm_address_t *)&fl->u.ip4.saddr;
1233 case AF_INET6:
1234 return (xfrm_address_t *)&fl->u.ip6.saddr;
1235 }
1236 return NULL;
1237}
1238
1239static __inline__
1240void xfrm_flowi_addr_get(const struct flowi *fl,
1241 xfrm_address_t *saddr, xfrm_address_t *daddr,
1242 unsigned short family)
1243{
1244 switch(family) {
1245 case AF_INET:
1246 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4));
1247 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4));
1248 break;
1249 case AF_INET6:
1250 saddr->in6 = fl->u.ip6.saddr;
1251 daddr->in6 = fl->u.ip6.daddr;
1252 break;
1253 }
1254}
1255
1256static __inline__ int
1257__xfrm4_state_addr_check(const struct xfrm_state *x,
1258 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1259{
1260 if (daddr->a4 == x->id.daddr.a4 &&
1261 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1262 return 1;
1263 return 0;
1264}
1265
1266static __inline__ int
1267__xfrm6_state_addr_check(const struct xfrm_state *x,
1268 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1269{
1270 if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1271 (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) ||
1272 ipv6_addr_any((struct in6_addr *)saddr) ||
1273 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1274 return 1;
1275 return 0;
1276}
1277
1278static __inline__ int
1279xfrm_state_addr_check(const struct xfrm_state *x,
1280 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1281 unsigned short family)
1282{
1283 switch (family) {
1284 case AF_INET:
1285 return __xfrm4_state_addr_check(x, daddr, saddr);
1286 case AF_INET6:
1287 return __xfrm6_state_addr_check(x, daddr, saddr);
1288 }
1289 return 0;
1290}
1291
1292static __inline__ int
1293xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl,
1294 unsigned short family)
1295{
1296 switch (family) {
1297 case AF_INET:
1298 return __xfrm4_state_addr_check(x,
1299 (const xfrm_address_t *)&fl->u.ip4.daddr,
1300 (const xfrm_address_t *)&fl->u.ip4.saddr);
1301 case AF_INET6:
1302 return __xfrm6_state_addr_check(x,
1303 (const xfrm_address_t *)&fl->u.ip6.daddr,
1304 (const xfrm_address_t *)&fl->u.ip6.saddr);
1305 }
1306 return 0;
1307}
1308
1309static inline int xfrm_state_kern(const struct xfrm_state *x)
1310{
1311 return atomic_read(&x->tunnel_users);
1312}
1313
1314static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1315{
1316 return (!userproto || proto == userproto ||
1317 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1318 proto == IPPROTO_ESP ||
1319 proto == IPPROTO_COMP)));
1320}
1321
1322/*
1323 * xfrm algorithm information
1324 */
1325struct xfrm_algo_aead_info {
1326 char *geniv;
1327 u16 icv_truncbits;
1328};
1329
1330struct xfrm_algo_auth_info {
1331 u16 icv_truncbits;
1332 u16 icv_fullbits;
1333};
1334
1335struct xfrm_algo_encr_info {
1336 char *geniv;
1337 u16 blockbits;
1338 u16 defkeybits;
1339};
1340
1341struct xfrm_algo_comp_info {
1342 u16 threshold;
1343};
1344
1345struct xfrm_algo_desc {
1346 char *name;
1347 char *compat;
1348 u8 available:1;
1349 u8 pfkey_supported:1;
1350 union {
1351 struct xfrm_algo_aead_info aead;
1352 struct xfrm_algo_auth_info auth;
1353 struct xfrm_algo_encr_info encr;
1354 struct xfrm_algo_comp_info comp;
1355 } uinfo;
1356 struct sadb_alg desc;
1357};
1358
1359/* XFRM protocol handlers. */
1360struct xfrm4_protocol {
1361 int (*handler)(struct sk_buff *skb);
1362 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1363 int encap_type);
1364 int (*cb_handler)(struct sk_buff *skb, int err);
1365 int (*err_handler)(struct sk_buff *skb, u32 info);
1366
1367 struct xfrm4_protocol __rcu *next;
1368 int priority;
1369};
1370
1371struct xfrm6_protocol {
1372 int (*handler)(struct sk_buff *skb);
1373 int (*cb_handler)(struct sk_buff *skb, int err);
1374 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1375 u8 type, u8 code, int offset, __be32 info);
1376
1377 struct xfrm6_protocol __rcu *next;
1378 int priority;
1379};
1380
1381/* XFRM tunnel handlers. */
1382struct xfrm_tunnel {
1383 int (*handler)(struct sk_buff *skb);
1384 int (*err_handler)(struct sk_buff *skb, u32 info);
1385
1386 struct xfrm_tunnel __rcu *next;
1387 int priority;
1388};
1389
1390struct xfrm6_tunnel {
1391 int (*handler)(struct sk_buff *skb);
1392 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1393 u8 type, u8 code, int offset, __be32 info);
1394 struct xfrm6_tunnel __rcu *next;
1395 int priority;
1396};
1397
1398void xfrm_init(void);
1399void xfrm4_init(void);
1400int xfrm_state_init(struct net *net);
1401void xfrm_state_fini(struct net *net);
1402void xfrm4_state_init(void);
1403void xfrm4_protocol_init(void);
1404#ifdef CONFIG_XFRM
1405int xfrm6_init(void);
1406void xfrm6_fini(void);
1407int xfrm6_state_init(void);
1408void xfrm6_state_fini(void);
1409int xfrm6_protocol_init(void);
1410void xfrm6_protocol_fini(void);
1411#else
1412static inline int xfrm6_init(void)
1413{
1414 return 0;
1415}
1416static inline void xfrm6_fini(void)
1417{
1418 ;
1419}
1420#endif
1421
1422#ifdef CONFIG_XFRM_STATISTICS
1423int xfrm_proc_init(struct net *net);
1424void xfrm_proc_fini(struct net *net);
1425#endif
1426
1427int xfrm_sysctl_init(struct net *net);
1428#ifdef CONFIG_SYSCTL
1429void xfrm_sysctl_fini(struct net *net);
1430#else
1431static inline void xfrm_sysctl_fini(struct net *net)
1432{
1433}
1434#endif
1435
1436void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
1437 struct xfrm_address_filter *filter);
1438int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1439 int (*func)(struct xfrm_state *, int, void*), void *);
1440void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net);
1441struct xfrm_state *xfrm_state_alloc(struct net *net);
1442struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr,
1443 const xfrm_address_t *saddr,
1444 const struct flowi *fl,
1445 struct xfrm_tmpl *tmpl,
1446 struct xfrm_policy *pol, int *err,
1447 unsigned short family);
1448struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark,
1449 xfrm_address_t *daddr,
1450 xfrm_address_t *saddr,
1451 unsigned short family,
1452 u8 mode, u8 proto, u32 reqid);
1453struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
1454 unsigned short family);
1455int xfrm_state_check_expire(struct xfrm_state *x);
1456void xfrm_state_insert(struct xfrm_state *x);
1457int xfrm_state_add(struct xfrm_state *x);
1458int xfrm_state_update(struct xfrm_state *x);
1459struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1460 const xfrm_address_t *daddr, __be32 spi,
1461 u8 proto, unsigned short family);
1462struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1463 const xfrm_address_t *daddr,
1464 const xfrm_address_t *saddr,
1465 u8 proto,
1466 unsigned short family);
1467#ifdef CONFIG_XFRM_SUB_POLICY
1468int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1469 unsigned short family, struct net *net);
1470int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1471 unsigned short family);
1472#else
1473static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1474 int n, unsigned short family, struct net *net)
1475{
1476 return -ENOSYS;
1477}
1478
1479static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1480 int n, unsigned short family)
1481{
1482 return -ENOSYS;
1483}
1484#endif
1485
1486struct xfrmk_sadinfo {
1487 u32 sadhcnt; /* current hash bkts */
1488 u32 sadhmcnt; /* max allowed hash bkts */
1489 u32 sadcnt; /* current running count */
1490};
1491
1492struct xfrmk_spdinfo {
1493 u32 incnt;
1494 u32 outcnt;
1495 u32 fwdcnt;
1496 u32 inscnt;
1497 u32 outscnt;
1498 u32 fwdscnt;
1499 u32 spdhcnt;
1500 u32 spdhmcnt;
1501};
1502
1503struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1504int xfrm_state_delete(struct xfrm_state *x);
1505int xfrm_state_flush(struct net *net, u8 proto, bool task_valid);
1506void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1507void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1508u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq);
1509int xfrm_init_replay(struct xfrm_state *x);
1510int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1511int __xfrm_init_state(struct xfrm_state *x, bool init_replay);
1512int xfrm_init_state(struct xfrm_state *x);
1513int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
1514int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type);
1515int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1516int xfrm_output_resume(struct sk_buff *skb, int err);
1517int xfrm_output(struct sock *sk, struct sk_buff *skb);
1518int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1519void xfrm_local_error(struct sk_buff *skb, int mtu);
1520int xfrm4_extract_header(struct sk_buff *skb);
1521int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1522int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1523 int encap_type);
1524int xfrm4_transport_finish(struct sk_buff *skb, int async);
1525int xfrm4_rcv(struct sk_buff *skb);
1526
1527static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1528{
1529 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
1530 XFRM_SPI_SKB_CB(skb)->family = AF_INET;
1531 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
1532 return xfrm_input(skb, nexthdr, spi, 0);
1533}
1534
1535int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1536int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1537int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1538int xfrm4_output_finish(struct sock *sk, struct sk_buff *skb);
1539int xfrm4_rcv_cb(struct sk_buff *skb, u8 protocol, int err);
1540int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol);
1541int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol);
1542int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1543int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1544void xfrm4_local_error(struct sk_buff *skb, u32 mtu);
1545int xfrm6_extract_header(struct sk_buff *skb);
1546int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1547int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi);
1548int xfrm6_transport_finish(struct sk_buff *skb, int async);
1549int xfrm6_rcv(struct sk_buff *skb);
1550int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1551 xfrm_address_t *saddr, u8 proto);
1552void xfrm6_local_error(struct sk_buff *skb, u32 mtu);
1553int xfrm6_rcv_cb(struct sk_buff *skb, u8 protocol, int err);
1554int xfrm6_protocol_register(struct xfrm6_protocol *handler, unsigned char protocol);
1555int xfrm6_protocol_deregister(struct xfrm6_protocol *handler, unsigned char protocol);
1556int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1557int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1558__be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1559__be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr);
1560int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1561int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1562int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1563int xfrm6_output_finish(struct sock *sk, struct sk_buff *skb);
1564int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1565 u8 **prevhdr);
1566
1567#ifdef CONFIG_XFRM
1568int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1569int xfrm_user_policy(struct sock *sk, int optname,
1570 u8 __user *optval, int optlen);
1571#else
1572static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1573{
1574 return -ENOPROTOOPT;
1575}
1576
1577static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1578{
1579 /* should not happen */
1580 kfree_skb(skb);
1581 return 0;
1582}
1583#endif
1584
1585struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1586
1587void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1588int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1589 int (*func)(struct xfrm_policy *, int, int, void*),
1590 void *);
1591void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net);
1592int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1593struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark,
1594 u8 type, int dir,
1595 struct xfrm_selector *sel,
1596 struct xfrm_sec_ctx *ctx, int delete,
1597 int *err);
1598struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8, int dir,
1599 u32 id, int delete, int *err);
1600int xfrm_policy_flush(struct net *net, u8 type, bool task_valid);
1601void xfrm_policy_hash_rebuild(struct net *net);
1602u32 xfrm_get_acqseq(void);
1603int verify_spi_info(u8 proto, u32 min, u32 max);
1604int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1605struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark,
1606 u8 mode, u32 reqid, u8 proto,
1607 const xfrm_address_t *daddr,
1608 const xfrm_address_t *saddr, int create,
1609 unsigned short family);
1610int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1611
1612#ifdef CONFIG_XFRM_MIGRATE
1613int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1614 const struct xfrm_migrate *m, int num_bundles,
1615 const struct xfrm_kmaddress *k);
1616struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net);
1617struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1618 struct xfrm_migrate *m);
1619int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1620 struct xfrm_migrate *m, int num_bundles,
1621 struct xfrm_kmaddress *k, struct net *net);
1622#endif
1623
1624int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1625void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid);
1626int km_report(struct net *net, u8 proto, struct xfrm_selector *sel,
1627 xfrm_address_t *addr);
1628
1629void xfrm_input_init(void);
1630int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1631
1632void xfrm_probe_algs(void);
1633int xfrm_count_pfkey_auth_supported(void);
1634int xfrm_count_pfkey_enc_supported(void);
1635struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1636struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1637struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1638struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1639struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1640struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe);
1641struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe);
1642struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe);
1643struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len,
1644 int probe);
1645
1646static inline bool xfrm6_addr_equal(const xfrm_address_t *a,
1647 const xfrm_address_t *b)
1648{
1649 return ipv6_addr_equal((const struct in6_addr *)a,
1650 (const struct in6_addr *)b);
1651}
1652
1653static inline bool xfrm_addr_equal(const xfrm_address_t *a,
1654 const xfrm_address_t *b,
1655 sa_family_t family)
1656{
1657 switch (family) {
1658 default:
1659 case AF_INET:
1660 return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0;
1661 case AF_INET6:
1662 return xfrm6_addr_equal(a, b);
1663 }
1664}
1665
1666static inline int xfrm_policy_id2dir(u32 index)
1667{
1668 return index & 7;
1669}
1670
1671#ifdef CONFIG_XFRM
1672static inline int xfrm_aevent_is_on(struct net *net)
1673{
1674 struct sock *nlsk;
1675 int ret = 0;
1676
1677 rcu_read_lock();
1678 nlsk = rcu_dereference(net->xfrm.nlsk);
1679 if (nlsk)
1680 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1681 rcu_read_unlock();
1682 return ret;
1683}
1684
1685static inline int xfrm_acquire_is_on(struct net *net)
1686{
1687 struct sock *nlsk;
1688 int ret = 0;
1689
1690 rcu_read_lock();
1691 nlsk = rcu_dereference(net->xfrm.nlsk);
1692 if (nlsk)
1693 ret = netlink_has_listeners(nlsk, XFRMNLGRP_ACQUIRE);
1694 rcu_read_unlock();
1695
1696 return ret;
1697}
1698#endif
1699
1700static inline int aead_len(struct xfrm_algo_aead *alg)
1701{
1702 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1703}
1704
1705static inline int xfrm_alg_len(const struct xfrm_algo *alg)
1706{
1707 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1708}
1709
1710static inline int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg)
1711{
1712 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1713}
1714
1715static inline int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn)
1716{
1717 return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32);
1718}
1719
1720#ifdef CONFIG_XFRM_MIGRATE
1721static inline int xfrm_replay_clone(struct xfrm_state *x,
1722 struct xfrm_state *orig)
1723{
1724 x->replay_esn = kzalloc(xfrm_replay_state_esn_len(orig->replay_esn),
1725 GFP_KERNEL);
1726 if (!x->replay_esn)
1727 return -ENOMEM;
1728
1729 x->replay_esn->bmp_len = orig->replay_esn->bmp_len;
1730 x->replay_esn->replay_window = orig->replay_esn->replay_window;
1731
1732 x->preplay_esn = kmemdup(x->replay_esn,
1733 xfrm_replay_state_esn_len(x->replay_esn),
1734 GFP_KERNEL);
1735 if (!x->preplay_esn) {
1736 kfree(x->replay_esn);
1737 return -ENOMEM;
1738 }
1739
1740 return 0;
1741}
1742
1743static inline struct xfrm_algo_aead *xfrm_algo_aead_clone(struct xfrm_algo_aead *orig)
1744{
1745 return kmemdup(orig, aead_len(orig), GFP_KERNEL);
1746}
1747
1748
1749static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1750{
1751 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1752}
1753
1754static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1755{
1756 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1757}
1758
1759static inline void xfrm_states_put(struct xfrm_state **states, int n)
1760{
1761 int i;
1762 for (i = 0; i < n; i++)
1763 xfrm_state_put(*(states + i));
1764}
1765
1766static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1767{
1768 int i;
1769 for (i = 0; i < n; i++)
1770 xfrm_state_delete(*(states + i));
1771}
1772#endif
1773
1774#ifdef CONFIG_XFRM
1775static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1776{
1777 return skb->sp->xvec[skb->sp->len - 1];
1778}
1779#endif
1780
1781static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
1782{
1783 if (attrs[XFRMA_MARK])
1784 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark));
1785 else
1786 m->v = m->m = 0;
1787
1788 return m->v & m->m;
1789}
1790
1791static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m)
1792{
1793 int ret = 0;
1794
1795 if (m->m | m->v)
1796 ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
1797 return ret;
1798}
1799
1800static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x,
1801 unsigned int family)
1802{
1803 bool tunnel = false;
1804
1805 switch(family) {
1806 case AF_INET:
1807 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4)
1808 tunnel = true;
1809 break;
1810 case AF_INET6:
1811 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6)
1812 tunnel = true;
1813 break;
1814 }
1815 if (tunnel && !(x->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL))
1816 return -EINVAL;
1817
1818 return 0;
1819}
1820#endif /* _NET_XFRM_H */
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
120struct 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
129enum {
130 XFRM_DEV_OFFLOAD_IN = 1,
131 XFRM_DEV_OFFLOAD_OUT,
132 XFRM_DEV_OFFLOAD_FWD,
133};
134
135enum {
136 XFRM_DEV_OFFLOAD_UNSPECIFIED,
137 XFRM_DEV_OFFLOAD_CRYPTO,
138 XFRM_DEV_OFFLOAD_PACKET,
139};
140
141struct xfrm_dev_offload {
142 struct net_device *dev;
143 netdevice_tracker dev_tracker;
144 struct net_device *real_dev;
145 unsigned long offload_handle;
146 u8 dir : 2;
147 u8 type : 2;
148};
149
150struct xfrm_mode {
151 u8 encap;
152 u8 family;
153 u8 flags;
154};
155
156/* Flags for xfrm_mode. */
157enum {
158 XFRM_MODE_FLAG_TUNNEL = 1,
159};
160
161enum xfrm_replay_mode {
162 XFRM_REPLAY_MODE_LEGACY,
163 XFRM_REPLAY_MODE_BMP,
164 XFRM_REPLAY_MODE_ESN,
165};
166
167/* Full description of state of transformer. */
168struct xfrm_state {
169 possible_net_t xs_net;
170 union {
171 struct hlist_node gclist;
172 struct hlist_node bydst;
173 };
174 struct hlist_node bysrc;
175 struct hlist_node byspi;
176 struct hlist_node byseq;
177
178 refcount_t refcnt;
179 spinlock_t lock;
180
181 struct xfrm_id id;
182 struct xfrm_selector sel;
183 struct xfrm_mark mark;
184 u32 if_id;
185 u32 tfcpad;
186
187 u32 genid;
188
189 /* Key manager bits */
190 struct xfrm_state_walk km;
191
192 /* Parameters of this state. */
193 struct {
194 u32 reqid;
195 u8 mode;
196 u8 replay_window;
197 u8 aalgo, ealgo, calgo;
198 u8 flags;
199 u16 family;
200 xfrm_address_t saddr;
201 int header_len;
202 int trailer_len;
203 u32 extra_flags;
204 struct xfrm_mark smark;
205 } props;
206
207 struct xfrm_lifetime_cfg lft;
208
209 /* Data for transformer */
210 struct xfrm_algo_auth *aalg;
211 struct xfrm_algo *ealg;
212 struct xfrm_algo *calg;
213 struct xfrm_algo_aead *aead;
214 const char *geniv;
215
216 /* mapping change rate limiting */
217 __be16 new_mapping_sport;
218 u32 new_mapping; /* seconds */
219 u32 mapping_maxage; /* seconds for input SA */
220
221 /* Data for encapsulator */
222 struct xfrm_encap_tmpl *encap;
223 struct sock __rcu *encap_sk;
224
225 /* Data for care-of address */
226 xfrm_address_t *coaddr;
227
228 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
229 struct xfrm_state *tunnel;
230
231 /* If a tunnel, number of users + 1 */
232 atomic_t tunnel_users;
233
234 /* State for replay detection */
235 struct xfrm_replay_state replay;
236 struct xfrm_replay_state_esn *replay_esn;
237
238 /* Replay detection state at the time we sent the last notification */
239 struct xfrm_replay_state preplay;
240 struct xfrm_replay_state_esn *preplay_esn;
241
242 /* replay detection mode */
243 enum xfrm_replay_mode repl_mode;
244 /* internal flag that only holds state for delayed aevent at the
245 * moment
246 */
247 u32 xflags;
248
249 /* Replay detection notification settings */
250 u32 replay_maxage;
251 u32 replay_maxdiff;
252
253 /* Replay detection notification timer */
254 struct timer_list rtimer;
255
256 /* Statistics */
257 struct xfrm_stats stats;
258
259 struct xfrm_lifetime_cur curlft;
260 struct hrtimer mtimer;
261
262 struct xfrm_dev_offload xso;
263
264 /* used to fix curlft->add_time when changing date */
265 long saved_tmo;
266
267 /* Last used time */
268 time64_t lastused;
269
270 struct page_frag xfrag;
271
272 /* Reference to data common to all the instances of this
273 * transformer. */
274 const struct xfrm_type *type;
275 struct xfrm_mode inner_mode;
276 struct xfrm_mode inner_mode_iaf;
277 struct xfrm_mode outer_mode;
278
279 const struct xfrm_type_offload *type_offload;
280
281 /* Security context */
282 struct xfrm_sec_ctx *security;
283
284 /* Private data of this transformer, format is opaque,
285 * interpreted by xfrm_type methods. */
286 void *data;
287};
288
289static inline struct net *xs_net(struct xfrm_state *x)
290{
291 return read_pnet(&x->xs_net);
292}
293
294/* xflags - make enum if more show up */
295#define XFRM_TIME_DEFER 1
296#define XFRM_SOFT_EXPIRE 2
297
298enum {
299 XFRM_STATE_VOID,
300 XFRM_STATE_ACQ,
301 XFRM_STATE_VALID,
302 XFRM_STATE_ERROR,
303 XFRM_STATE_EXPIRED,
304 XFRM_STATE_DEAD
305};
306
307/* callback structure passed from either netlink or pfkey */
308struct km_event {
309 union {
310 u32 hard;
311 u32 proto;
312 u32 byid;
313 u32 aevent;
314 u32 type;
315 } data;
316
317 u32 seq;
318 u32 portid;
319 u32 event;
320 struct net *net;
321};
322
323struct xfrm_if_decode_session_result {
324 struct net *net;
325 u32 if_id;
326};
327
328struct xfrm_if_cb {
329 bool (*decode_session)(struct sk_buff *skb,
330 unsigned short family,
331 struct xfrm_if_decode_session_result *res);
332};
333
334void xfrm_if_register_cb(const struct xfrm_if_cb *ifcb);
335void xfrm_if_unregister_cb(void);
336
337struct net_device;
338struct xfrm_type;
339struct xfrm_dst;
340struct xfrm_policy_afinfo {
341 struct dst_ops *dst_ops;
342 struct dst_entry *(*dst_lookup)(struct net *net,
343 int tos, int oif,
344 const xfrm_address_t *saddr,
345 const xfrm_address_t *daddr,
346 u32 mark);
347 int (*get_saddr)(struct net *net, int oif,
348 xfrm_address_t *saddr,
349 xfrm_address_t *daddr,
350 u32 mark);
351 int (*fill_dst)(struct xfrm_dst *xdst,
352 struct net_device *dev,
353 const struct flowi *fl);
354 struct dst_entry *(*blackhole_route)(struct net *net, struct dst_entry *orig);
355};
356
357int xfrm_policy_register_afinfo(const struct xfrm_policy_afinfo *afinfo, int family);
358void xfrm_policy_unregister_afinfo(const struct xfrm_policy_afinfo *afinfo);
359void km_policy_notify(struct xfrm_policy *xp, int dir,
360 const struct km_event *c);
361void km_state_notify(struct xfrm_state *x, const struct km_event *c);
362
363struct xfrm_tmpl;
364int km_query(struct xfrm_state *x, struct xfrm_tmpl *t,
365 struct xfrm_policy *pol);
366void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
367int __xfrm_state_delete(struct xfrm_state *x);
368
369struct xfrm_state_afinfo {
370 u8 family;
371 u8 proto;
372
373 const struct xfrm_type_offload *type_offload_esp;
374
375 const struct xfrm_type *type_esp;
376 const struct xfrm_type *type_ipip;
377 const struct xfrm_type *type_ipip6;
378 const struct xfrm_type *type_comp;
379 const struct xfrm_type *type_ah;
380 const struct xfrm_type *type_routing;
381 const struct xfrm_type *type_dstopts;
382
383 int (*output)(struct net *net, struct sock *sk, struct sk_buff *skb);
384 int (*transport_finish)(struct sk_buff *skb,
385 int async);
386 void (*local_error)(struct sk_buff *skb, u32 mtu);
387};
388
389int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
390int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
391struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family);
392struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family);
393
394struct xfrm_input_afinfo {
395 u8 family;
396 bool is_ipip;
397 int (*callback)(struct sk_buff *skb, u8 protocol,
398 int err);
399};
400
401int xfrm_input_register_afinfo(const struct xfrm_input_afinfo *afinfo);
402int xfrm_input_unregister_afinfo(const struct xfrm_input_afinfo *afinfo);
403
404void xfrm_flush_gc(void);
405void xfrm_state_delete_tunnel(struct xfrm_state *x);
406
407struct xfrm_type {
408 struct module *owner;
409 u8 proto;
410 u8 flags;
411#define XFRM_TYPE_NON_FRAGMENT 1
412#define XFRM_TYPE_REPLAY_PROT 2
413#define XFRM_TYPE_LOCAL_COADDR 4
414#define XFRM_TYPE_REMOTE_COADDR 8
415
416 int (*init_state)(struct xfrm_state *x,
417 struct netlink_ext_ack *extack);
418 void (*destructor)(struct xfrm_state *);
419 int (*input)(struct xfrm_state *, struct sk_buff *skb);
420 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
421 int (*reject)(struct xfrm_state *, struct sk_buff *,
422 const struct flowi *);
423};
424
425int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
426void xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
427
428struct xfrm_type_offload {
429 struct module *owner;
430 u8 proto;
431 void (*encap)(struct xfrm_state *, struct sk_buff *pskb);
432 int (*input_tail)(struct xfrm_state *x, struct sk_buff *skb);
433 int (*xmit)(struct xfrm_state *, struct sk_buff *pskb, netdev_features_t features);
434};
435
436int xfrm_register_type_offload(const struct xfrm_type_offload *type, unsigned short family);
437void xfrm_unregister_type_offload(const struct xfrm_type_offload *type, unsigned short family);
438
439static inline int xfrm_af2proto(unsigned int family)
440{
441 switch(family) {
442 case AF_INET:
443 return IPPROTO_IPIP;
444 case AF_INET6:
445 return IPPROTO_IPV6;
446 default:
447 return 0;
448 }
449}
450
451static inline const struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
452{
453 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
454 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
455 return &x->inner_mode;
456 else
457 return &x->inner_mode_iaf;
458}
459
460struct xfrm_tmpl {
461/* id in template is interpreted as:
462 * daddr - destination of tunnel, may be zero for transport mode.
463 * spi - zero to acquire spi. Not zero if spi is static, then
464 * daddr must be fixed too.
465 * proto - AH/ESP/IPCOMP
466 */
467 struct xfrm_id id;
468
469/* Source address of tunnel. Ignored, if it is not a tunnel. */
470 xfrm_address_t saddr;
471
472 unsigned short encap_family;
473
474 u32 reqid;
475
476/* Mode: transport, tunnel etc. */
477 u8 mode;
478
479/* Sharing mode: unique, this session only, this user only etc. */
480 u8 share;
481
482/* May skip this transfomration if no SA is found */
483 u8 optional;
484
485/* Skip aalgos/ealgos/calgos checks. */
486 u8 allalgs;
487
488/* Bit mask of algos allowed for acquisition */
489 u32 aalgos;
490 u32 ealgos;
491 u32 calgos;
492};
493
494#define XFRM_MAX_DEPTH 6
495#define XFRM_MAX_OFFLOAD_DEPTH 1
496
497struct xfrm_policy_walk_entry {
498 struct list_head all;
499 u8 dead;
500};
501
502struct xfrm_policy_walk {
503 struct xfrm_policy_walk_entry walk;
504 u8 type;
505 u32 seq;
506};
507
508struct xfrm_policy_queue {
509 struct sk_buff_head hold_queue;
510 struct timer_list hold_timer;
511 unsigned long timeout;
512};
513
514struct xfrm_policy {
515 possible_net_t xp_net;
516 struct hlist_node bydst;
517 struct hlist_node byidx;
518
519 /* This lock only affects elements except for entry. */
520 rwlock_t lock;
521 refcount_t refcnt;
522 u32 pos;
523 struct timer_list timer;
524
525 atomic_t genid;
526 u32 priority;
527 u32 index;
528 u32 if_id;
529 struct xfrm_mark mark;
530 struct xfrm_selector selector;
531 struct xfrm_lifetime_cfg lft;
532 struct xfrm_lifetime_cur curlft;
533 struct xfrm_policy_walk_entry walk;
534 struct xfrm_policy_queue polq;
535 bool bydst_reinsert;
536 u8 type;
537 u8 action;
538 u8 flags;
539 u8 xfrm_nr;
540 u16 family;
541 struct xfrm_sec_ctx *security;
542 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
543 struct hlist_node bydst_inexact_list;
544 struct rcu_head rcu;
545
546 struct xfrm_dev_offload xdo;
547};
548
549static inline struct net *xp_net(const struct xfrm_policy *xp)
550{
551 return read_pnet(&xp->xp_net);
552}
553
554struct xfrm_kmaddress {
555 xfrm_address_t local;
556 xfrm_address_t remote;
557 u32 reserved;
558 u16 family;
559};
560
561struct xfrm_migrate {
562 xfrm_address_t old_daddr;
563 xfrm_address_t old_saddr;
564 xfrm_address_t new_daddr;
565 xfrm_address_t new_saddr;
566 u8 proto;
567 u8 mode;
568 u16 reserved;
569 u32 reqid;
570 u16 old_family;
571 u16 new_family;
572};
573
574#define XFRM_KM_TIMEOUT 30
575/* what happened */
576#define XFRM_REPLAY_UPDATE XFRM_AE_CR
577#define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
578
579/* default aevent timeout in units of 100ms */
580#define XFRM_AE_ETIME 10
581/* Async Event timer multiplier */
582#define XFRM_AE_ETH_M 10
583/* default seq threshold size */
584#define XFRM_AE_SEQT_SIZE 2
585
586struct xfrm_mgr {
587 struct list_head list;
588 int (*notify)(struct xfrm_state *x, const struct km_event *c);
589 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp);
590 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
591 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
592 int (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c);
593 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
594 int (*migrate)(const struct xfrm_selector *sel,
595 u8 dir, u8 type,
596 const struct xfrm_migrate *m,
597 int num_bundles,
598 const struct xfrm_kmaddress *k,
599 const struct xfrm_encap_tmpl *encap);
600 bool (*is_alive)(const struct km_event *c);
601};
602
603void xfrm_register_km(struct xfrm_mgr *km);
604void xfrm_unregister_km(struct xfrm_mgr *km);
605
606struct xfrm_tunnel_skb_cb {
607 union {
608 struct inet_skb_parm h4;
609 struct inet6_skb_parm h6;
610 } header;
611
612 union {
613 struct ip_tunnel *ip4;
614 struct ip6_tnl *ip6;
615 } tunnel;
616};
617
618#define XFRM_TUNNEL_SKB_CB(__skb) ((struct xfrm_tunnel_skb_cb *)&((__skb)->cb[0]))
619
620/*
621 * This structure is used for the duration where packets are being
622 * transformed by IPsec. As soon as the packet leaves IPsec the
623 * area beyond the generic IP part may be overwritten.
624 */
625struct xfrm_skb_cb {
626 struct xfrm_tunnel_skb_cb header;
627
628 /* Sequence number for replay protection. */
629 union {
630 struct {
631 __u32 low;
632 __u32 hi;
633 } output;
634 struct {
635 __be32 low;
636 __be32 hi;
637 } input;
638 } seq;
639};
640
641#define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
642
643/*
644 * This structure is used by the afinfo prepare_input/prepare_output functions
645 * to transmit header information to the mode input/output functions.
646 */
647struct xfrm_mode_skb_cb {
648 struct xfrm_tunnel_skb_cb header;
649
650 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
651 __be16 id;
652 __be16 frag_off;
653
654 /* IP header length (excluding options or extension headers). */
655 u8 ihl;
656
657 /* TOS for IPv4, class for IPv6. */
658 u8 tos;
659
660 /* TTL for IPv4, hop limitfor IPv6. */
661 u8 ttl;
662
663 /* Protocol for IPv4, NH for IPv6. */
664 u8 protocol;
665
666 /* Option length for IPv4, zero for IPv6. */
667 u8 optlen;
668
669 /* Used by IPv6 only, zero for IPv4. */
670 u8 flow_lbl[3];
671};
672
673#define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
674
675/*
676 * This structure is used by the input processing to locate the SPI and
677 * related information.
678 */
679struct xfrm_spi_skb_cb {
680 struct xfrm_tunnel_skb_cb header;
681
682 unsigned int daddroff;
683 unsigned int family;
684 __be32 seq;
685};
686
687#define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
688
689#ifdef CONFIG_AUDITSYSCALL
690static inline struct audit_buffer *xfrm_audit_start(const char *op)
691{
692 struct audit_buffer *audit_buf = NULL;
693
694 if (audit_enabled == AUDIT_OFF)
695 return NULL;
696 audit_buf = audit_log_start(audit_context(), GFP_ATOMIC,
697 AUDIT_MAC_IPSEC_EVENT);
698 if (audit_buf == NULL)
699 return NULL;
700 audit_log_format(audit_buf, "op=%s", op);
701 return audit_buf;
702}
703
704static inline void xfrm_audit_helper_usrinfo(bool task_valid,
705 struct audit_buffer *audit_buf)
706{
707 const unsigned int auid = from_kuid(&init_user_ns, task_valid ?
708 audit_get_loginuid(current) :
709 INVALID_UID);
710 const unsigned int ses = task_valid ? audit_get_sessionid(current) :
711 AUDIT_SID_UNSET;
712
713 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
714 audit_log_task_context(audit_buf);
715}
716
717void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid);
718void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
719 bool task_valid);
720void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid);
721void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid);
722void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
723 struct sk_buff *skb);
724void xfrm_audit_state_replay(struct xfrm_state *x, struct sk_buff *skb,
725 __be32 net_seq);
726void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
727void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, __be32 net_spi,
728 __be32 net_seq);
729void xfrm_audit_state_icvfail(struct xfrm_state *x, struct sk_buff *skb,
730 u8 proto);
731#else
732
733static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
734 bool task_valid)
735{
736}
737
738static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
739 bool task_valid)
740{
741}
742
743static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
744 bool task_valid)
745{
746}
747
748static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
749 bool task_valid)
750{
751}
752
753static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
754 struct sk_buff *skb)
755{
756}
757
758static inline void xfrm_audit_state_replay(struct xfrm_state *x,
759 struct sk_buff *skb, __be32 net_seq)
760{
761}
762
763static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
764 u16 family)
765{
766}
767
768static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
769 __be32 net_spi, __be32 net_seq)
770{
771}
772
773static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
774 struct sk_buff *skb, u8 proto)
775{
776}
777#endif /* CONFIG_AUDITSYSCALL */
778
779static inline void xfrm_pol_hold(struct xfrm_policy *policy)
780{
781 if (likely(policy != NULL))
782 refcount_inc(&policy->refcnt);
783}
784
785void xfrm_policy_destroy(struct xfrm_policy *policy);
786
787static inline void xfrm_pol_put(struct xfrm_policy *policy)
788{
789 if (refcount_dec_and_test(&policy->refcnt))
790 xfrm_policy_destroy(policy);
791}
792
793static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
794{
795 int i;
796 for (i = npols - 1; i >= 0; --i)
797 xfrm_pol_put(pols[i]);
798}
799
800void __xfrm_state_destroy(struct xfrm_state *, bool);
801
802static inline void __xfrm_state_put(struct xfrm_state *x)
803{
804 refcount_dec(&x->refcnt);
805}
806
807static inline void xfrm_state_put(struct xfrm_state *x)
808{
809 if (refcount_dec_and_test(&x->refcnt))
810 __xfrm_state_destroy(x, false);
811}
812
813static inline void xfrm_state_put_sync(struct xfrm_state *x)
814{
815 if (refcount_dec_and_test(&x->refcnt))
816 __xfrm_state_destroy(x, true);
817}
818
819static inline void xfrm_state_hold(struct xfrm_state *x)
820{
821 refcount_inc(&x->refcnt);
822}
823
824static inline bool addr_match(const void *token1, const void *token2,
825 unsigned int prefixlen)
826{
827 const __be32 *a1 = token1;
828 const __be32 *a2 = token2;
829 unsigned int pdw;
830 unsigned int pbi;
831
832 pdw = prefixlen >> 5; /* num of whole u32 in prefix */
833 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
834
835 if (pdw)
836 if (memcmp(a1, a2, pdw << 2))
837 return false;
838
839 if (pbi) {
840 __be32 mask;
841
842 mask = htonl((0xffffffff) << (32 - pbi));
843
844 if ((a1[pdw] ^ a2[pdw]) & mask)
845 return false;
846 }
847
848 return true;
849}
850
851static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen)
852{
853 /* C99 6.5.7 (3): u32 << 32 is undefined behaviour */
854 if (sizeof(long) == 4 && prefixlen == 0)
855 return true;
856 return !((a1 ^ a2) & htonl(~0UL << (32 - prefixlen)));
857}
858
859static __inline__
860__be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli)
861{
862 __be16 port;
863 switch(fl->flowi_proto) {
864 case IPPROTO_TCP:
865 case IPPROTO_UDP:
866 case IPPROTO_UDPLITE:
867 case IPPROTO_SCTP:
868 port = uli->ports.sport;
869 break;
870 case IPPROTO_ICMP:
871 case IPPROTO_ICMPV6:
872 port = htons(uli->icmpt.type);
873 break;
874 case IPPROTO_MH:
875 port = htons(uli->mht.type);
876 break;
877 case IPPROTO_GRE:
878 port = htons(ntohl(uli->gre_key) >> 16);
879 break;
880 default:
881 port = 0; /*XXX*/
882 }
883 return port;
884}
885
886static __inline__
887__be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli)
888{
889 __be16 port;
890 switch(fl->flowi_proto) {
891 case IPPROTO_TCP:
892 case IPPROTO_UDP:
893 case IPPROTO_UDPLITE:
894 case IPPROTO_SCTP:
895 port = uli->ports.dport;
896 break;
897 case IPPROTO_ICMP:
898 case IPPROTO_ICMPV6:
899 port = htons(uli->icmpt.code);
900 break;
901 case IPPROTO_GRE:
902 port = htons(ntohl(uli->gre_key) & 0xffff);
903 break;
904 default:
905 port = 0; /*XXX*/
906 }
907 return port;
908}
909
910bool xfrm_selector_match(const struct xfrm_selector *sel,
911 const struct flowi *fl, unsigned short family);
912
913#ifdef CONFIG_SECURITY_NETWORK_XFRM
914/* If neither has a context --> match
915 * Otherwise, both must have a context and the sids, doi, alg must match
916 */
917static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
918{
919 return ((!s1 && !s2) ||
920 (s1 && s2 &&
921 (s1->ctx_sid == s2->ctx_sid) &&
922 (s1->ctx_doi == s2->ctx_doi) &&
923 (s1->ctx_alg == s2->ctx_alg)));
924}
925#else
926static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
927{
928 return true;
929}
930#endif
931
932/* A struct encoding bundle of transformations to apply to some set of flow.
933 *
934 * xdst->child points to the next element of bundle.
935 * dst->xfrm points to an instanse of transformer.
936 *
937 * Due to unfortunate limitations of current routing cache, which we
938 * have no time to fix, it mirrors struct rtable and bound to the same
939 * routing key, including saddr,daddr. However, we can have many of
940 * bundles differing by session id. All the bundles grow from a parent
941 * policy rule.
942 */
943struct xfrm_dst {
944 union {
945 struct dst_entry dst;
946 struct rtable rt;
947 struct rt6_info rt6;
948 } u;
949 struct dst_entry *route;
950 struct dst_entry *child;
951 struct dst_entry *path;
952 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
953 int num_pols, num_xfrms;
954 u32 xfrm_genid;
955 u32 policy_genid;
956 u32 route_mtu_cached;
957 u32 child_mtu_cached;
958 u32 route_cookie;
959 u32 path_cookie;
960};
961
962static inline struct dst_entry *xfrm_dst_path(const struct dst_entry *dst)
963{
964#ifdef CONFIG_XFRM
965 if (dst->xfrm || (dst->flags & DST_XFRM_QUEUE)) {
966 const struct xfrm_dst *xdst = (const struct xfrm_dst *) dst;
967
968 return xdst->path;
969 }
970#endif
971 return (struct dst_entry *) dst;
972}
973
974static inline struct dst_entry *xfrm_dst_child(const struct dst_entry *dst)
975{
976#ifdef CONFIG_XFRM
977 if (dst->xfrm || (dst->flags & DST_XFRM_QUEUE)) {
978 struct xfrm_dst *xdst = (struct xfrm_dst *) dst;
979 return xdst->child;
980 }
981#endif
982 return NULL;
983}
984
985#ifdef CONFIG_XFRM
986static inline void xfrm_dst_set_child(struct xfrm_dst *xdst, struct dst_entry *child)
987{
988 xdst->child = child;
989}
990
991static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
992{
993 xfrm_pols_put(xdst->pols, xdst->num_pols);
994 dst_release(xdst->route);
995 if (likely(xdst->u.dst.xfrm))
996 xfrm_state_put(xdst->u.dst.xfrm);
997}
998#endif
999
1000void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
1001
1002struct xfrm_if_parms {
1003 int link; /* ifindex of underlying L2 interface */
1004 u32 if_id; /* interface identifyer */
1005 bool collect_md;
1006};
1007
1008struct xfrm_if {
1009 struct xfrm_if __rcu *next; /* next interface in list */
1010 struct net_device *dev; /* virtual device associated with interface */
1011 struct net *net; /* netns for packet i/o */
1012 struct xfrm_if_parms p; /* interface parms */
1013
1014 struct gro_cells gro_cells;
1015};
1016
1017struct xfrm_offload {
1018 /* Output sequence number for replay protection on offloading. */
1019 struct {
1020 __u32 low;
1021 __u32 hi;
1022 } seq;
1023
1024 __u32 flags;
1025#define SA_DELETE_REQ 1
1026#define CRYPTO_DONE 2
1027#define CRYPTO_NEXT_DONE 4
1028#define CRYPTO_FALLBACK 8
1029#define XFRM_GSO_SEGMENT 16
1030#define XFRM_GRO 32
1031/* 64 is free */
1032#define XFRM_DEV_RESUME 128
1033#define XFRM_XMIT 256
1034
1035 __u32 status;
1036#define CRYPTO_SUCCESS 1
1037#define CRYPTO_GENERIC_ERROR 2
1038#define CRYPTO_TRANSPORT_AH_AUTH_FAILED 4
1039#define CRYPTO_TRANSPORT_ESP_AUTH_FAILED 8
1040#define CRYPTO_TUNNEL_AH_AUTH_FAILED 16
1041#define CRYPTO_TUNNEL_ESP_AUTH_FAILED 32
1042#define CRYPTO_INVALID_PACKET_SYNTAX 64
1043#define CRYPTO_INVALID_PROTOCOL 128
1044
1045 __u8 proto;
1046 __u8 inner_ipproto;
1047};
1048
1049struct sec_path {
1050 int len;
1051 int olen;
1052
1053 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
1054 struct xfrm_offload ovec[XFRM_MAX_OFFLOAD_DEPTH];
1055};
1056
1057struct sec_path *secpath_set(struct sk_buff *skb);
1058
1059static inline void
1060secpath_reset(struct sk_buff *skb)
1061{
1062#ifdef CONFIG_XFRM
1063 skb_ext_del(skb, SKB_EXT_SEC_PATH);
1064#endif
1065}
1066
1067static inline int
1068xfrm_addr_any(const xfrm_address_t *addr, unsigned short family)
1069{
1070 switch (family) {
1071 case AF_INET:
1072 return addr->a4 == 0;
1073 case AF_INET6:
1074 return ipv6_addr_any(&addr->in6);
1075 }
1076 return 0;
1077}
1078
1079static inline int
1080__xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1081{
1082 return (tmpl->saddr.a4 &&
1083 tmpl->saddr.a4 != x->props.saddr.a4);
1084}
1085
1086static inline int
1087__xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1088{
1089 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
1090 !ipv6_addr_equal((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
1091}
1092
1093static inline int
1094xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family)
1095{
1096 switch (family) {
1097 case AF_INET:
1098 return __xfrm4_state_addr_cmp(tmpl, x);
1099 case AF_INET6:
1100 return __xfrm6_state_addr_cmp(tmpl, x);
1101 }
1102 return !0;
1103}
1104
1105#ifdef CONFIG_XFRM
1106static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1107{
1108 struct sec_path *sp = skb_sec_path(skb);
1109
1110 return sp->xvec[sp->len - 1];
1111}
1112#endif
1113
1114static inline struct xfrm_offload *xfrm_offload(struct sk_buff *skb)
1115{
1116#ifdef CONFIG_XFRM
1117 struct sec_path *sp = skb_sec_path(skb);
1118
1119 if (!sp || !sp->olen || sp->len != sp->olen)
1120 return NULL;
1121
1122 return &sp->ovec[sp->olen - 1];
1123#else
1124 return NULL;
1125#endif
1126}
1127
1128#ifdef CONFIG_XFRM
1129int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb,
1130 unsigned short family);
1131
1132static inline bool __xfrm_check_nopolicy(struct net *net, struct sk_buff *skb,
1133 int dir)
1134{
1135 if (!net->xfrm.policy_count[dir] && !secpath_exists(skb))
1136 return net->xfrm.policy_default[dir] == XFRM_USERPOLICY_ACCEPT;
1137
1138 return false;
1139}
1140
1141static inline bool __xfrm_check_dev_nopolicy(struct sk_buff *skb,
1142 int dir, unsigned short family)
1143{
1144 if (dir != XFRM_POLICY_OUT && family == AF_INET) {
1145 /* same dst may be used for traffic originating from
1146 * devices with different policy settings.
1147 */
1148 return IPCB(skb)->flags & IPSKB_NOPOLICY;
1149 }
1150 return skb_dst(skb) && (skb_dst(skb)->flags & DST_NOPOLICY);
1151}
1152
1153static inline int __xfrm_policy_check2(struct sock *sk, int dir,
1154 struct sk_buff *skb,
1155 unsigned int family, int reverse)
1156{
1157 struct net *net = dev_net(skb->dev);
1158 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
1159 struct xfrm_offload *xo = xfrm_offload(skb);
1160 struct xfrm_state *x;
1161
1162 if (sk && sk->sk_policy[XFRM_POLICY_IN])
1163 return __xfrm_policy_check(sk, ndir, skb, family);
1164
1165 if (xo) {
1166 x = xfrm_input_state(skb);
1167 if (x->xso.type == XFRM_DEV_OFFLOAD_PACKET)
1168 return (xo->flags & CRYPTO_DONE) &&
1169 (xo->status & CRYPTO_SUCCESS);
1170 }
1171
1172 return __xfrm_check_nopolicy(net, skb, dir) ||
1173 __xfrm_check_dev_nopolicy(skb, dir, family) ||
1174 __xfrm_policy_check(sk, ndir, skb, family);
1175}
1176
1177static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1178{
1179 return __xfrm_policy_check2(sk, dir, skb, family, 0);
1180}
1181
1182static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1183{
1184 return xfrm_policy_check(sk, dir, skb, AF_INET);
1185}
1186
1187static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1188{
1189 return xfrm_policy_check(sk, dir, skb, AF_INET6);
1190}
1191
1192static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1193 struct sk_buff *skb)
1194{
1195 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1196}
1197
1198static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1199 struct sk_buff *skb)
1200{
1201 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1202}
1203
1204int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1205 unsigned int family, int reverse);
1206
1207static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1208 unsigned int family)
1209{
1210 return __xfrm_decode_session(skb, fl, family, 0);
1211}
1212
1213static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1214 struct flowi *fl,
1215 unsigned int family)
1216{
1217 return __xfrm_decode_session(skb, fl, family, 1);
1218}
1219
1220int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1221
1222static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1223{
1224 struct net *net = dev_net(skb->dev);
1225
1226 if (!net->xfrm.policy_count[XFRM_POLICY_OUT] &&
1227 net->xfrm.policy_default[XFRM_POLICY_OUT] == XFRM_USERPOLICY_ACCEPT)
1228 return true;
1229
1230 return (skb_dst(skb)->flags & DST_NOXFRM) ||
1231 __xfrm_route_forward(skb, family);
1232}
1233
1234static inline int xfrm4_route_forward(struct sk_buff *skb)
1235{
1236 return xfrm_route_forward(skb, AF_INET);
1237}
1238
1239static inline int xfrm6_route_forward(struct sk_buff *skb)
1240{
1241 return xfrm_route_forward(skb, AF_INET6);
1242}
1243
1244int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk);
1245
1246static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk)
1247{
1248 if (!sk_fullsock(osk))
1249 return 0;
1250 sk->sk_policy[0] = NULL;
1251 sk->sk_policy[1] = NULL;
1252 if (unlikely(osk->sk_policy[0] || osk->sk_policy[1]))
1253 return __xfrm_sk_clone_policy(sk, osk);
1254 return 0;
1255}
1256
1257int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1258
1259static inline void xfrm_sk_free_policy(struct sock *sk)
1260{
1261 struct xfrm_policy *pol;
1262
1263 pol = rcu_dereference_protected(sk->sk_policy[0], 1);
1264 if (unlikely(pol != NULL)) {
1265 xfrm_policy_delete(pol, XFRM_POLICY_MAX);
1266 sk->sk_policy[0] = NULL;
1267 }
1268 pol = rcu_dereference_protected(sk->sk_policy[1], 1);
1269 if (unlikely(pol != NULL)) {
1270 xfrm_policy_delete(pol, XFRM_POLICY_MAX+1);
1271 sk->sk_policy[1] = NULL;
1272 }
1273}
1274
1275#else
1276
1277static inline void xfrm_sk_free_policy(struct sock *sk) {}
1278static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) { return 0; }
1279static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1280static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1281static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1282{
1283 return 1;
1284}
1285static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1286{
1287 return 1;
1288}
1289static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1290{
1291 return 1;
1292}
1293static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1294 struct flowi *fl,
1295 unsigned int family)
1296{
1297 return -ENOSYS;
1298}
1299static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1300 struct sk_buff *skb)
1301{
1302 return 1;
1303}
1304static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1305 struct sk_buff *skb)
1306{
1307 return 1;
1308}
1309#endif
1310
1311static __inline__
1312xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family)
1313{
1314 switch (family){
1315 case AF_INET:
1316 return (xfrm_address_t *)&fl->u.ip4.daddr;
1317 case AF_INET6:
1318 return (xfrm_address_t *)&fl->u.ip6.daddr;
1319 }
1320 return NULL;
1321}
1322
1323static __inline__
1324xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family)
1325{
1326 switch (family){
1327 case AF_INET:
1328 return (xfrm_address_t *)&fl->u.ip4.saddr;
1329 case AF_INET6:
1330 return (xfrm_address_t *)&fl->u.ip6.saddr;
1331 }
1332 return NULL;
1333}
1334
1335static __inline__
1336void xfrm_flowi_addr_get(const struct flowi *fl,
1337 xfrm_address_t *saddr, xfrm_address_t *daddr,
1338 unsigned short family)
1339{
1340 switch(family) {
1341 case AF_INET:
1342 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4));
1343 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4));
1344 break;
1345 case AF_INET6:
1346 saddr->in6 = fl->u.ip6.saddr;
1347 daddr->in6 = fl->u.ip6.daddr;
1348 break;
1349 }
1350}
1351
1352static __inline__ int
1353__xfrm4_state_addr_check(const struct xfrm_state *x,
1354 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1355{
1356 if (daddr->a4 == x->id.daddr.a4 &&
1357 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1358 return 1;
1359 return 0;
1360}
1361
1362static __inline__ int
1363__xfrm6_state_addr_check(const struct xfrm_state *x,
1364 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1365{
1366 if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1367 (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) ||
1368 ipv6_addr_any((struct in6_addr *)saddr) ||
1369 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1370 return 1;
1371 return 0;
1372}
1373
1374static __inline__ int
1375xfrm_state_addr_check(const struct xfrm_state *x,
1376 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1377 unsigned short family)
1378{
1379 switch (family) {
1380 case AF_INET:
1381 return __xfrm4_state_addr_check(x, daddr, saddr);
1382 case AF_INET6:
1383 return __xfrm6_state_addr_check(x, daddr, saddr);
1384 }
1385 return 0;
1386}
1387
1388static __inline__ int
1389xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl,
1390 unsigned short family)
1391{
1392 switch (family) {
1393 case AF_INET:
1394 return __xfrm4_state_addr_check(x,
1395 (const xfrm_address_t *)&fl->u.ip4.daddr,
1396 (const xfrm_address_t *)&fl->u.ip4.saddr);
1397 case AF_INET6:
1398 return __xfrm6_state_addr_check(x,
1399 (const xfrm_address_t *)&fl->u.ip6.daddr,
1400 (const xfrm_address_t *)&fl->u.ip6.saddr);
1401 }
1402 return 0;
1403}
1404
1405static inline int xfrm_state_kern(const struct xfrm_state *x)
1406{
1407 return atomic_read(&x->tunnel_users);
1408}
1409
1410static inline bool xfrm_id_proto_valid(u8 proto)
1411{
1412 switch (proto) {
1413 case IPPROTO_AH:
1414 case IPPROTO_ESP:
1415 case IPPROTO_COMP:
1416#if IS_ENABLED(CONFIG_IPV6)
1417 case IPPROTO_ROUTING:
1418 case IPPROTO_DSTOPTS:
1419#endif
1420 return true;
1421 default:
1422 return false;
1423 }
1424}
1425
1426/* IPSEC_PROTO_ANY only matches 3 IPsec protocols, 0 could match all. */
1427static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1428{
1429 return (!userproto || proto == userproto ||
1430 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1431 proto == IPPROTO_ESP ||
1432 proto == IPPROTO_COMP)));
1433}
1434
1435/*
1436 * xfrm algorithm information
1437 */
1438struct xfrm_algo_aead_info {
1439 char *geniv;
1440 u16 icv_truncbits;
1441};
1442
1443struct xfrm_algo_auth_info {
1444 u16 icv_truncbits;
1445 u16 icv_fullbits;
1446};
1447
1448struct xfrm_algo_encr_info {
1449 char *geniv;
1450 u16 blockbits;
1451 u16 defkeybits;
1452};
1453
1454struct xfrm_algo_comp_info {
1455 u16 threshold;
1456};
1457
1458struct xfrm_algo_desc {
1459 char *name;
1460 char *compat;
1461 u8 available:1;
1462 u8 pfkey_supported:1;
1463 union {
1464 struct xfrm_algo_aead_info aead;
1465 struct xfrm_algo_auth_info auth;
1466 struct xfrm_algo_encr_info encr;
1467 struct xfrm_algo_comp_info comp;
1468 } uinfo;
1469 struct sadb_alg desc;
1470};
1471
1472/* XFRM protocol handlers. */
1473struct xfrm4_protocol {
1474 int (*handler)(struct sk_buff *skb);
1475 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1476 int encap_type);
1477 int (*cb_handler)(struct sk_buff *skb, int err);
1478 int (*err_handler)(struct sk_buff *skb, u32 info);
1479
1480 struct xfrm4_protocol __rcu *next;
1481 int priority;
1482};
1483
1484struct xfrm6_protocol {
1485 int (*handler)(struct sk_buff *skb);
1486 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1487 int encap_type);
1488 int (*cb_handler)(struct sk_buff *skb, int err);
1489 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1490 u8 type, u8 code, int offset, __be32 info);
1491
1492 struct xfrm6_protocol __rcu *next;
1493 int priority;
1494};
1495
1496/* XFRM tunnel handlers. */
1497struct xfrm_tunnel {
1498 int (*handler)(struct sk_buff *skb);
1499 int (*cb_handler)(struct sk_buff *skb, int err);
1500 int (*err_handler)(struct sk_buff *skb, u32 info);
1501
1502 struct xfrm_tunnel __rcu *next;
1503 int priority;
1504};
1505
1506struct xfrm6_tunnel {
1507 int (*handler)(struct sk_buff *skb);
1508 int (*cb_handler)(struct sk_buff *skb, int err);
1509 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1510 u8 type, u8 code, int offset, __be32 info);
1511 struct xfrm6_tunnel __rcu *next;
1512 int priority;
1513};
1514
1515void xfrm_init(void);
1516void xfrm4_init(void);
1517int xfrm_state_init(struct net *net);
1518void xfrm_state_fini(struct net *net);
1519void xfrm4_state_init(void);
1520void xfrm4_protocol_init(void);
1521#ifdef CONFIG_XFRM
1522int xfrm6_init(void);
1523void xfrm6_fini(void);
1524int xfrm6_state_init(void);
1525void xfrm6_state_fini(void);
1526int xfrm6_protocol_init(void);
1527void xfrm6_protocol_fini(void);
1528#else
1529static inline int xfrm6_init(void)
1530{
1531 return 0;
1532}
1533static inline void xfrm6_fini(void)
1534{
1535 ;
1536}
1537#endif
1538
1539#ifdef CONFIG_XFRM_STATISTICS
1540int xfrm_proc_init(struct net *net);
1541void xfrm_proc_fini(struct net *net);
1542#endif
1543
1544int xfrm_sysctl_init(struct net *net);
1545#ifdef CONFIG_SYSCTL
1546void xfrm_sysctl_fini(struct net *net);
1547#else
1548static inline void xfrm_sysctl_fini(struct net *net)
1549{
1550}
1551#endif
1552
1553void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
1554 struct xfrm_address_filter *filter);
1555int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1556 int (*func)(struct xfrm_state *, int, void*), void *);
1557void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net);
1558struct xfrm_state *xfrm_state_alloc(struct net *net);
1559void xfrm_state_free(struct xfrm_state *x);
1560struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr,
1561 const xfrm_address_t *saddr,
1562 const struct flowi *fl,
1563 struct xfrm_tmpl *tmpl,
1564 struct xfrm_policy *pol, int *err,
1565 unsigned short family, u32 if_id);
1566struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark, u32 if_id,
1567 xfrm_address_t *daddr,
1568 xfrm_address_t *saddr,
1569 unsigned short family,
1570 u8 mode, u8 proto, u32 reqid);
1571struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
1572 unsigned short family);
1573int xfrm_state_check_expire(struct xfrm_state *x);
1574#ifdef CONFIG_XFRM_OFFLOAD
1575static inline void xfrm_dev_state_update_curlft(struct xfrm_state *x)
1576{
1577 struct xfrm_dev_offload *xdo = &x->xso;
1578 struct net_device *dev = xdo->dev;
1579
1580 if (x->xso.type != XFRM_DEV_OFFLOAD_PACKET)
1581 return;
1582
1583 if (dev && dev->xfrmdev_ops &&
1584 dev->xfrmdev_ops->xdo_dev_state_update_curlft)
1585 dev->xfrmdev_ops->xdo_dev_state_update_curlft(x);
1586
1587}
1588#else
1589static inline void xfrm_dev_state_update_curlft(struct xfrm_state *x) {}
1590#endif
1591void xfrm_state_insert(struct xfrm_state *x);
1592int xfrm_state_add(struct xfrm_state *x);
1593int xfrm_state_update(struct xfrm_state *x);
1594struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1595 const xfrm_address_t *daddr, __be32 spi,
1596 u8 proto, unsigned short family);
1597struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1598 const xfrm_address_t *daddr,
1599 const xfrm_address_t *saddr,
1600 u8 proto,
1601 unsigned short family);
1602#ifdef CONFIG_XFRM_SUB_POLICY
1603void xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1604 unsigned short family);
1605void xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1606 unsigned short family);
1607#else
1608static inline void xfrm_tmpl_sort(struct xfrm_tmpl **d, struct xfrm_tmpl **s,
1609 int n, unsigned short family)
1610{
1611}
1612
1613static inline void xfrm_state_sort(struct xfrm_state **d, struct xfrm_state **s,
1614 int n, unsigned short family)
1615{
1616}
1617#endif
1618
1619struct xfrmk_sadinfo {
1620 u32 sadhcnt; /* current hash bkts */
1621 u32 sadhmcnt; /* max allowed hash bkts */
1622 u32 sadcnt; /* current running count */
1623};
1624
1625struct xfrmk_spdinfo {
1626 u32 incnt;
1627 u32 outcnt;
1628 u32 fwdcnt;
1629 u32 inscnt;
1630 u32 outscnt;
1631 u32 fwdscnt;
1632 u32 spdhcnt;
1633 u32 spdhmcnt;
1634};
1635
1636struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1637int xfrm_state_delete(struct xfrm_state *x);
1638int xfrm_state_flush(struct net *net, u8 proto, bool task_valid, bool sync);
1639int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid);
1640int xfrm_dev_policy_flush(struct net *net, struct net_device *dev,
1641 bool task_valid);
1642void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1643void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1644u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq);
1645int xfrm_init_replay(struct xfrm_state *x, struct netlink_ext_ack *extack);
1646u32 xfrm_state_mtu(struct xfrm_state *x, int mtu);
1647int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload,
1648 struct netlink_ext_ack *extack);
1649int xfrm_init_state(struct xfrm_state *x);
1650int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type);
1651int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1652int xfrm_trans_queue_net(struct net *net, struct sk_buff *skb,
1653 int (*finish)(struct net *, struct sock *,
1654 struct sk_buff *));
1655int xfrm_trans_queue(struct sk_buff *skb,
1656 int (*finish)(struct net *, struct sock *,
1657 struct sk_buff *));
1658int xfrm_output_resume(struct sock *sk, struct sk_buff *skb, int err);
1659int xfrm_output(struct sock *sk, struct sk_buff *skb);
1660
1661#if IS_ENABLED(CONFIG_NET_PKTGEN)
1662int pktgen_xfrm_outer_mode_output(struct xfrm_state *x, struct sk_buff *skb);
1663#endif
1664
1665void xfrm_local_error(struct sk_buff *skb, int mtu);
1666int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1667int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1668 int encap_type);
1669int xfrm4_transport_finish(struct sk_buff *skb, int async);
1670int xfrm4_rcv(struct sk_buff *skb);
1671
1672static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1673{
1674 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
1675 XFRM_SPI_SKB_CB(skb)->family = AF_INET;
1676 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
1677 return xfrm_input(skb, nexthdr, spi, 0);
1678}
1679
1680int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1681int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol);
1682int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol);
1683int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1684int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1685void xfrm4_local_error(struct sk_buff *skb, u32 mtu);
1686int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1687int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi,
1688 struct ip6_tnl *t);
1689int xfrm6_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1690 int encap_type);
1691int xfrm6_transport_finish(struct sk_buff *skb, int async);
1692int xfrm6_rcv_tnl(struct sk_buff *skb, struct ip6_tnl *t);
1693int xfrm6_rcv(struct sk_buff *skb);
1694int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1695 xfrm_address_t *saddr, u8 proto);
1696void xfrm6_local_error(struct sk_buff *skb, u32 mtu);
1697int xfrm6_protocol_register(struct xfrm6_protocol *handler, unsigned char protocol);
1698int xfrm6_protocol_deregister(struct xfrm6_protocol *handler, unsigned char protocol);
1699int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1700int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1701__be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1702__be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr);
1703int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1704
1705#ifdef CONFIG_XFRM
1706void xfrm6_local_rxpmtu(struct sk_buff *skb, u32 mtu);
1707int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1708int xfrm6_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1709int xfrm_user_policy(struct sock *sk, int optname, sockptr_t optval,
1710 int optlen);
1711#else
1712static inline int xfrm_user_policy(struct sock *sk, int optname,
1713 sockptr_t optval, int optlen)
1714{
1715 return -ENOPROTOOPT;
1716}
1717#endif
1718
1719struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, int oif,
1720 const xfrm_address_t *saddr,
1721 const xfrm_address_t *daddr,
1722 int family, u32 mark);
1723
1724struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1725
1726void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1727int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1728 int (*func)(struct xfrm_policy *, int, int, void*),
1729 void *);
1730void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net);
1731int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1732struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net,
1733 const struct xfrm_mark *mark,
1734 u32 if_id, u8 type, int dir,
1735 struct xfrm_selector *sel,
1736 struct xfrm_sec_ctx *ctx, int delete,
1737 int *err);
1738struct xfrm_policy *xfrm_policy_byid(struct net *net,
1739 const struct xfrm_mark *mark, u32 if_id,
1740 u8 type, int dir, u32 id, int delete,
1741 int *err);
1742int xfrm_policy_flush(struct net *net, u8 type, bool task_valid);
1743void xfrm_policy_hash_rebuild(struct net *net);
1744u32 xfrm_get_acqseq(void);
1745int verify_spi_info(u8 proto, u32 min, u32 max, struct netlink_ext_ack *extack);
1746int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi,
1747 struct netlink_ext_ack *extack);
1748struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark,
1749 u8 mode, u32 reqid, u32 if_id, u8 proto,
1750 const xfrm_address_t *daddr,
1751 const xfrm_address_t *saddr, int create,
1752 unsigned short family);
1753int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1754
1755#ifdef CONFIG_XFRM_MIGRATE
1756int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1757 const struct xfrm_migrate *m, int num_bundles,
1758 const struct xfrm_kmaddress *k,
1759 const struct xfrm_encap_tmpl *encap);
1760struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net,
1761 u32 if_id);
1762struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1763 struct xfrm_migrate *m,
1764 struct xfrm_encap_tmpl *encap);
1765int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1766 struct xfrm_migrate *m, int num_bundles,
1767 struct xfrm_kmaddress *k, struct net *net,
1768 struct xfrm_encap_tmpl *encap, u32 if_id,
1769 struct netlink_ext_ack *extack);
1770#endif
1771
1772int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1773void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid);
1774int km_report(struct net *net, u8 proto, struct xfrm_selector *sel,
1775 xfrm_address_t *addr);
1776
1777void xfrm_input_init(void);
1778int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1779
1780void xfrm_probe_algs(void);
1781int xfrm_count_pfkey_auth_supported(void);
1782int xfrm_count_pfkey_enc_supported(void);
1783struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1784struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1785struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1786struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1787struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1788struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe);
1789struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe);
1790struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe);
1791struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len,
1792 int probe);
1793
1794static inline bool xfrm6_addr_equal(const xfrm_address_t *a,
1795 const xfrm_address_t *b)
1796{
1797 return ipv6_addr_equal((const struct in6_addr *)a,
1798 (const struct in6_addr *)b);
1799}
1800
1801static inline bool xfrm_addr_equal(const xfrm_address_t *a,
1802 const xfrm_address_t *b,
1803 sa_family_t family)
1804{
1805 switch (family) {
1806 default:
1807 case AF_INET:
1808 return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0;
1809 case AF_INET6:
1810 return xfrm6_addr_equal(a, b);
1811 }
1812}
1813
1814static inline int xfrm_policy_id2dir(u32 index)
1815{
1816 return index & 7;
1817}
1818
1819#ifdef CONFIG_XFRM
1820void xfrm_replay_advance(struct xfrm_state *x, __be32 net_seq);
1821int xfrm_replay_check(struct xfrm_state *x, struct sk_buff *skb, __be32 net_seq);
1822void xfrm_replay_notify(struct xfrm_state *x, int event);
1823int xfrm_replay_overflow(struct xfrm_state *x, struct sk_buff *skb);
1824int xfrm_replay_recheck(struct xfrm_state *x, struct sk_buff *skb, __be32 net_seq);
1825
1826static inline int xfrm_aevent_is_on(struct net *net)
1827{
1828 struct sock *nlsk;
1829 int ret = 0;
1830
1831 rcu_read_lock();
1832 nlsk = rcu_dereference(net->xfrm.nlsk);
1833 if (nlsk)
1834 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1835 rcu_read_unlock();
1836 return ret;
1837}
1838
1839static inline int xfrm_acquire_is_on(struct net *net)
1840{
1841 struct sock *nlsk;
1842 int ret = 0;
1843
1844 rcu_read_lock();
1845 nlsk = rcu_dereference(net->xfrm.nlsk);
1846 if (nlsk)
1847 ret = netlink_has_listeners(nlsk, XFRMNLGRP_ACQUIRE);
1848 rcu_read_unlock();
1849
1850 return ret;
1851}
1852#endif
1853
1854static inline unsigned int aead_len(struct xfrm_algo_aead *alg)
1855{
1856 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1857}
1858
1859static inline unsigned int xfrm_alg_len(const struct xfrm_algo *alg)
1860{
1861 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1862}
1863
1864static inline unsigned int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg)
1865{
1866 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1867}
1868
1869static inline unsigned int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn)
1870{
1871 return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32);
1872}
1873
1874#ifdef CONFIG_XFRM_MIGRATE
1875static inline int xfrm_replay_clone(struct xfrm_state *x,
1876 struct xfrm_state *orig)
1877{
1878
1879 x->replay_esn = kmemdup(orig->replay_esn,
1880 xfrm_replay_state_esn_len(orig->replay_esn),
1881 GFP_KERNEL);
1882 if (!x->replay_esn)
1883 return -ENOMEM;
1884 x->preplay_esn = kmemdup(orig->preplay_esn,
1885 xfrm_replay_state_esn_len(orig->preplay_esn),
1886 GFP_KERNEL);
1887 if (!x->preplay_esn)
1888 return -ENOMEM;
1889
1890 return 0;
1891}
1892
1893static inline struct xfrm_algo_aead *xfrm_algo_aead_clone(struct xfrm_algo_aead *orig)
1894{
1895 return kmemdup(orig, aead_len(orig), GFP_KERNEL);
1896}
1897
1898
1899static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1900{
1901 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1902}
1903
1904static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1905{
1906 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1907}
1908
1909static inline void xfrm_states_put(struct xfrm_state **states, int n)
1910{
1911 int i;
1912 for (i = 0; i < n; i++)
1913 xfrm_state_put(*(states + i));
1914}
1915
1916static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1917{
1918 int i;
1919 for (i = 0; i < n; i++)
1920 xfrm_state_delete(*(states + i));
1921}
1922#endif
1923
1924void __init xfrm_dev_init(void);
1925
1926#ifdef CONFIG_XFRM_OFFLOAD
1927void xfrm_dev_resume(struct sk_buff *skb);
1928void xfrm_dev_backlog(struct softnet_data *sd);
1929struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again);
1930int xfrm_dev_state_add(struct net *net, struct xfrm_state *x,
1931 struct xfrm_user_offload *xuo,
1932 struct netlink_ext_ack *extack);
1933int xfrm_dev_policy_add(struct net *net, struct xfrm_policy *xp,
1934 struct xfrm_user_offload *xuo, u8 dir,
1935 struct netlink_ext_ack *extack);
1936bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x);
1937
1938static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
1939{
1940 struct xfrm_dev_offload *xso = &x->xso;
1941
1942 if (xso->dev && xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn)
1943 xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn(x);
1944}
1945
1946static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
1947{
1948 struct xfrm_state *x = dst->xfrm;
1949 struct xfrm_dst *xdst;
1950
1951 if (!x || !x->type_offload)
1952 return false;
1953
1954 xdst = (struct xfrm_dst *) dst;
1955 if (!x->xso.offload_handle && !xdst->child->xfrm)
1956 return true;
1957 if (x->xso.offload_handle && (x->xso.dev == xfrm_dst_path(dst)->dev) &&
1958 !xdst->child->xfrm)
1959 return true;
1960
1961 return false;
1962}
1963
1964static inline void xfrm_dev_state_delete(struct xfrm_state *x)
1965{
1966 struct xfrm_dev_offload *xso = &x->xso;
1967
1968 if (xso->dev)
1969 xso->dev->xfrmdev_ops->xdo_dev_state_delete(x);
1970}
1971
1972static inline void xfrm_dev_state_free(struct xfrm_state *x)
1973{
1974 struct xfrm_dev_offload *xso = &x->xso;
1975 struct net_device *dev = xso->dev;
1976
1977 if (dev && dev->xfrmdev_ops) {
1978 if (dev->xfrmdev_ops->xdo_dev_state_free)
1979 dev->xfrmdev_ops->xdo_dev_state_free(x);
1980 xso->dev = NULL;
1981 netdev_put(dev, &xso->dev_tracker);
1982 }
1983}
1984
1985static inline void xfrm_dev_policy_delete(struct xfrm_policy *x)
1986{
1987 struct xfrm_dev_offload *xdo = &x->xdo;
1988 struct net_device *dev = xdo->dev;
1989
1990 if (dev && dev->xfrmdev_ops && dev->xfrmdev_ops->xdo_dev_policy_delete)
1991 dev->xfrmdev_ops->xdo_dev_policy_delete(x);
1992}
1993
1994static inline void xfrm_dev_policy_free(struct xfrm_policy *x)
1995{
1996 struct xfrm_dev_offload *xdo = &x->xdo;
1997 struct net_device *dev = xdo->dev;
1998
1999 if (dev && dev->xfrmdev_ops) {
2000 if (dev->xfrmdev_ops->xdo_dev_policy_free)
2001 dev->xfrmdev_ops->xdo_dev_policy_free(x);
2002 xdo->dev = NULL;
2003 netdev_put(dev, &xdo->dev_tracker);
2004 }
2005}
2006#else
2007static inline void xfrm_dev_resume(struct sk_buff *skb)
2008{
2009}
2010
2011static inline void xfrm_dev_backlog(struct softnet_data *sd)
2012{
2013}
2014
2015static inline struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again)
2016{
2017 return skb;
2018}
2019
2020static inline int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, struct xfrm_user_offload *xuo, struct netlink_ext_ack *extack)
2021{
2022 return 0;
2023}
2024
2025static inline void xfrm_dev_state_delete(struct xfrm_state *x)
2026{
2027}
2028
2029static inline void xfrm_dev_state_free(struct xfrm_state *x)
2030{
2031}
2032
2033static inline int xfrm_dev_policy_add(struct net *net, struct xfrm_policy *xp,
2034 struct xfrm_user_offload *xuo, u8 dir,
2035 struct netlink_ext_ack *extack)
2036{
2037 return 0;
2038}
2039
2040static inline void xfrm_dev_policy_delete(struct xfrm_policy *x)
2041{
2042}
2043
2044static inline void xfrm_dev_policy_free(struct xfrm_policy *x)
2045{
2046}
2047
2048static inline bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x)
2049{
2050 return false;
2051}
2052
2053static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
2054{
2055}
2056
2057static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
2058{
2059 return false;
2060}
2061#endif
2062
2063static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
2064{
2065 if (attrs[XFRMA_MARK])
2066 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark));
2067 else
2068 m->v = m->m = 0;
2069
2070 return m->v & m->m;
2071}
2072
2073static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m)
2074{
2075 int ret = 0;
2076
2077 if (m->m | m->v)
2078 ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
2079 return ret;
2080}
2081
2082static inline __u32 xfrm_smark_get(__u32 mark, struct xfrm_state *x)
2083{
2084 struct xfrm_mark *m = &x->props.smark;
2085
2086 return (m->v & m->m) | (mark & ~m->m);
2087}
2088
2089static inline int xfrm_if_id_put(struct sk_buff *skb, __u32 if_id)
2090{
2091 int ret = 0;
2092
2093 if (if_id)
2094 ret = nla_put_u32(skb, XFRMA_IF_ID, if_id);
2095 return ret;
2096}
2097
2098static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x,
2099 unsigned int family)
2100{
2101 bool tunnel = false;
2102
2103 switch(family) {
2104 case AF_INET:
2105 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4)
2106 tunnel = true;
2107 break;
2108 case AF_INET6:
2109 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6)
2110 tunnel = true;
2111 break;
2112 }
2113 if (tunnel && !(x->outer_mode.flags & XFRM_MODE_FLAG_TUNNEL))
2114 return -EINVAL;
2115
2116 return 0;
2117}
2118
2119extern const int xfrm_msg_min[XFRM_NR_MSGTYPES];
2120extern const struct nla_policy xfrma_policy[XFRMA_MAX+1];
2121
2122struct xfrm_translator {
2123 /* Allocate frag_list and put compat translation there */
2124 int (*alloc_compat)(struct sk_buff *skb, const struct nlmsghdr *src);
2125
2126 /* Allocate nlmsg with 64-bit translaton of received 32-bit message */
2127 struct nlmsghdr *(*rcv_msg_compat)(const struct nlmsghdr *nlh,
2128 int maxtype, const struct nla_policy *policy,
2129 struct netlink_ext_ack *extack);
2130
2131 /* Translate 32-bit user_policy from sockptr */
2132 int (*xlate_user_policy_sockptr)(u8 **pdata32, int optlen);
2133
2134 struct module *owner;
2135};
2136
2137#if IS_ENABLED(CONFIG_XFRM_USER_COMPAT)
2138extern int xfrm_register_translator(struct xfrm_translator *xtr);
2139extern int xfrm_unregister_translator(struct xfrm_translator *xtr);
2140extern struct xfrm_translator *xfrm_get_translator(void);
2141extern void xfrm_put_translator(struct xfrm_translator *xtr);
2142#else
2143static inline struct xfrm_translator *xfrm_get_translator(void)
2144{
2145 return NULL;
2146}
2147static inline void xfrm_put_translator(struct xfrm_translator *xtr)
2148{
2149}
2150#endif
2151
2152#if IS_ENABLED(CONFIG_IPV6)
2153static inline bool xfrm6_local_dontfrag(const struct sock *sk)
2154{
2155 int proto;
2156
2157 if (!sk || sk->sk_family != AF_INET6)
2158 return false;
2159
2160 proto = sk->sk_protocol;
2161 if (proto == IPPROTO_UDP || proto == IPPROTO_RAW)
2162 return inet6_sk(sk)->dontfrag;
2163
2164 return false;
2165}
2166#endif
2167
2168#if (IS_BUILTIN(CONFIG_XFRM_INTERFACE) && IS_ENABLED(CONFIG_DEBUG_INFO_BTF)) || \
2169 (IS_MODULE(CONFIG_XFRM_INTERFACE) && IS_ENABLED(CONFIG_DEBUG_INFO_BTF_MODULES))
2170
2171extern struct metadata_dst __percpu *xfrm_bpf_md_dst;
2172
2173int register_xfrm_interface_bpf(void);
2174
2175#else
2176
2177static inline int register_xfrm_interface_bpf(void)
2178{
2179 return 0;
2180}
2181
2182#endif
2183
2184#endif /* _NET_XFRM_H */