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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
56extern struct mutex xfrm_cfg_mutex;
57
58/* Organization of SPD aka "XFRM rules"
59 ------------------------------------
60
61 Basic objects:
62 - policy rule, struct xfrm_policy (=SPD entry)
63 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
64 - instance of a transformer, struct xfrm_state (=SA)
65 - template to clone xfrm_state, struct xfrm_tmpl
66
67 SPD is plain linear list of xfrm_policy rules, ordered by priority.
68 (To be compatible with existing pfkeyv2 implementations,
69 many rules with priority of 0x7fffffff are allowed to exist and
70 such rules are ordered in an unpredictable way, thanks to bsd folks.)
71
72 Lookup is plain linear search until the first match with selector.
73
74 If "action" is "block", then we prohibit the flow, otherwise:
75 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
76 policy entry has list of up to XFRM_MAX_DEPTH transformations,
77 described by templates xfrm_tmpl. Each template is resolved
78 to a complete xfrm_state (see below) and we pack bundle of transformations
79 to a dst_entry returned to requestor.
80
81 dst -. xfrm .-> xfrm_state #1
82 |---. child .-> dst -. xfrm .-> xfrm_state #2
83 |---. child .-> dst -. xfrm .-> xfrm_state #3
84 |---. child .-> NULL
85
86 Bundles are cached at xrfm_policy struct (field ->bundles).
87
88
89 Resolution of xrfm_tmpl
90 -----------------------
91 Template contains:
92 1. ->mode Mode: transport or tunnel
93 2. ->id.proto Protocol: AH/ESP/IPCOMP
94 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode.
95 Q: allow to resolve security gateway?
96 4. ->id.spi If not zero, static SPI.
97 5. ->saddr Local tunnel endpoint, ignored for transport mode.
98 6. ->algos List of allowed algos. Plain bitmask now.
99 Q: ealgos, aalgos, calgos. What a mess...
100 7. ->share Sharing mode.
101 Q: how to implement private sharing mode? To add struct sock* to
102 flow id?
103
104 Having this template we search through SAD searching for entries
105 with appropriate mode/proto/algo, permitted by selector.
106 If no appropriate entry found, it is requested from key manager.
107
108 PROBLEMS:
109 Q: How to find all the bundles referring to a physical path for
110 PMTU discovery? Seems, dst should contain list of all parents...
111 and enter to infinite locking hierarchy disaster.
112 No! It is easier, we will not search for them, let them find us.
113 We add genid to each dst plus pointer to genid of raw IP route,
114 pmtu disc will update pmtu on raw IP route and increase its genid.
115 dst_check() will see this for top level and trigger resyncing
116 metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
117 */
118
119struct xfrm_state_walk {
120 struct list_head all;
121 u8 state;
122 union {
123 u8 dying;
124 u8 proto;
125 };
126 u32 seq;
127};
128
129/* Full description of state of transformer. */
130struct xfrm_state {
131#ifdef CONFIG_NET_NS
132 struct net *xs_net;
133#endif
134 union {
135 struct hlist_node gclist;
136 struct hlist_node bydst;
137 };
138 struct hlist_node bysrc;
139 struct hlist_node byspi;
140
141 atomic_t refcnt;
142 spinlock_t lock;
143
144 struct xfrm_id id;
145 struct xfrm_selector sel;
146 struct xfrm_mark mark;
147 u32 tfcpad;
148
149 u32 genid;
150
151 /* Key manager bits */
152 struct xfrm_state_walk km;
153
154 /* Parameters of this state. */
155 struct {
156 u32 reqid;
157 u8 mode;
158 u8 replay_window;
159 u8 aalgo, ealgo, calgo;
160 u8 flags;
161 u16 family;
162 xfrm_address_t saddr;
163 int header_len;
164 int trailer_len;
165 } props;
166
167 struct xfrm_lifetime_cfg lft;
168
169 /* Data for transformer */
170 struct xfrm_algo_auth *aalg;
171 struct xfrm_algo *ealg;
172 struct xfrm_algo *calg;
173 struct xfrm_algo_aead *aead;
174
175 /* Data for encapsulator */
176 struct xfrm_encap_tmpl *encap;
177
178 /* Data for care-of address */
179 xfrm_address_t *coaddr;
180
181 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
182 struct xfrm_state *tunnel;
183
184 /* If a tunnel, number of users + 1 */
185 atomic_t tunnel_users;
186
187 /* State for replay detection */
188 struct xfrm_replay_state replay;
189 struct xfrm_replay_state_esn *replay_esn;
190
191 /* Replay detection state at the time we sent the last notification */
192 struct xfrm_replay_state preplay;
193 struct xfrm_replay_state_esn *preplay_esn;
194
195 /* The functions for replay detection. */
196 struct xfrm_replay *repl;
197
198 /* internal flag that only holds state for delayed aevent at the
199 * moment
200 */
201 u32 xflags;
202
203 /* Replay detection notification settings */
204 u32 replay_maxage;
205 u32 replay_maxdiff;
206
207 /* Replay detection notification timer */
208 struct timer_list rtimer;
209
210 /* Statistics */
211 struct xfrm_stats stats;
212
213 struct xfrm_lifetime_cur curlft;
214 struct tasklet_hrtimer mtimer;
215
216 /* Last used time */
217 unsigned long lastused;
218
219 /* Reference to data common to all the instances of this
220 * transformer. */
221 const struct xfrm_type *type;
222 struct xfrm_mode *inner_mode;
223 struct xfrm_mode *inner_mode_iaf;
224 struct xfrm_mode *outer_mode;
225
226 /* Security context */
227 struct xfrm_sec_ctx *security;
228
229 /* Private data of this transformer, format is opaque,
230 * interpreted by xfrm_type methods. */
231 void *data;
232};
233
234static inline struct net *xs_net(struct xfrm_state *x)
235{
236 return read_pnet(&x->xs_net);
237}
238
239/* xflags - make enum if more show up */
240#define XFRM_TIME_DEFER 1
241
242enum {
243 XFRM_STATE_VOID,
244 XFRM_STATE_ACQ,
245 XFRM_STATE_VALID,
246 XFRM_STATE_ERROR,
247 XFRM_STATE_EXPIRED,
248 XFRM_STATE_DEAD
249};
250
251/* callback structure passed from either netlink or pfkey */
252struct km_event {
253 union {
254 u32 hard;
255 u32 proto;
256 u32 byid;
257 u32 aevent;
258 u32 type;
259 } data;
260
261 u32 seq;
262 u32 pid;
263 u32 event;
264 struct net *net;
265};
266
267struct xfrm_replay {
268 void (*advance)(struct xfrm_state *x, __be32 net_seq);
269 int (*check)(struct xfrm_state *x,
270 struct sk_buff *skb,
271 __be32 net_seq);
272 void (*notify)(struct xfrm_state *x, int event);
273 int (*overflow)(struct xfrm_state *x, struct sk_buff *skb);
274};
275
276struct net_device;
277struct xfrm_type;
278struct xfrm_dst;
279struct xfrm_policy_afinfo {
280 unsigned short family;
281 struct dst_ops *dst_ops;
282 void (*garbage_collect)(struct net *net);
283 struct dst_entry *(*dst_lookup)(struct net *net, int tos,
284 const xfrm_address_t *saddr,
285 const xfrm_address_t *daddr);
286 int (*get_saddr)(struct net *net, xfrm_address_t *saddr, xfrm_address_t *daddr);
287 void (*decode_session)(struct sk_buff *skb,
288 struct flowi *fl,
289 int reverse);
290 int (*get_tos)(const struct flowi *fl);
291 int (*init_path)(struct xfrm_dst *path,
292 struct dst_entry *dst,
293 int nfheader_len);
294 int (*fill_dst)(struct xfrm_dst *xdst,
295 struct net_device *dev,
296 const struct flowi *fl);
297 struct dst_entry *(*blackhole_route)(struct net *net, struct dst_entry *orig);
298};
299
300extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
301extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
302extern void km_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c);
303extern void km_state_notify(struct xfrm_state *x, const struct km_event *c);
304
305struct xfrm_tmpl;
306extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
307extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid);
308extern int __xfrm_state_delete(struct xfrm_state *x);
309
310struct xfrm_state_afinfo {
311 unsigned int family;
312 unsigned int proto;
313 __be16 eth_proto;
314 struct module *owner;
315 const struct xfrm_type *type_map[IPPROTO_MAX];
316 struct xfrm_mode *mode_map[XFRM_MODE_MAX];
317 int (*init_flags)(struct xfrm_state *x);
318 void (*init_tempsel)(struct xfrm_selector *sel,
319 const struct flowi *fl);
320 void (*init_temprop)(struct xfrm_state *x,
321 const struct xfrm_tmpl *tmpl,
322 const xfrm_address_t *daddr,
323 const xfrm_address_t *saddr);
324 int (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n);
325 int (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n);
326 int (*output)(struct sk_buff *skb);
327 int (*output_finish)(struct sk_buff *skb);
328 int (*extract_input)(struct xfrm_state *x,
329 struct sk_buff *skb);
330 int (*extract_output)(struct xfrm_state *x,
331 struct sk_buff *skb);
332 int (*transport_finish)(struct sk_buff *skb,
333 int async);
334};
335
336extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
337extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
338
339extern void xfrm_state_delete_tunnel(struct xfrm_state *x);
340
341struct xfrm_type {
342 char *description;
343 struct module *owner;
344 u8 proto;
345 u8 flags;
346#define XFRM_TYPE_NON_FRAGMENT 1
347#define XFRM_TYPE_REPLAY_PROT 2
348#define XFRM_TYPE_LOCAL_COADDR 4
349#define XFRM_TYPE_REMOTE_COADDR 8
350
351 int (*init_state)(struct xfrm_state *x);
352 void (*destructor)(struct xfrm_state *);
353 int (*input)(struct xfrm_state *, struct sk_buff *skb);
354 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
355 int (*reject)(struct xfrm_state *, struct sk_buff *,
356 const struct flowi *);
357 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
358 /* Estimate maximal size of result of transformation of a dgram */
359 u32 (*get_mtu)(struct xfrm_state *, int size);
360};
361
362extern int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
363extern int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
364
365struct xfrm_mode {
366 /*
367 * Remove encapsulation header.
368 *
369 * The IP header will be moved over the top of the encapsulation
370 * header.
371 *
372 * On entry, the transport header shall point to where the IP header
373 * should be and the network header shall be set to where the IP
374 * header currently is. skb->data shall point to the start of the
375 * payload.
376 */
377 int (*input2)(struct xfrm_state *x, struct sk_buff *skb);
378
379 /*
380 * This is the actual input entry point.
381 *
382 * For transport mode and equivalent this would be identical to
383 * input2 (which does not need to be set). While tunnel mode
384 * and equivalent would set this to the tunnel encapsulation function
385 * xfrm4_prepare_input that would in turn call input2.
386 */
387 int (*input)(struct xfrm_state *x, struct sk_buff *skb);
388
389 /*
390 * Add encapsulation header.
391 *
392 * On exit, the transport header will be set to the start of the
393 * encapsulation header to be filled in by x->type->output and
394 * the mac header will be set to the nextheader (protocol for
395 * IPv4) field of the extension header directly preceding the
396 * encapsulation header, or in its absence, that of the top IP
397 * header. The value of the network header will always point
398 * to the top IP header while skb->data will point to the payload.
399 */
400 int (*output2)(struct xfrm_state *x,struct sk_buff *skb);
401
402 /*
403 * This is the actual output entry point.
404 *
405 * For transport mode and equivalent this would be identical to
406 * output2 (which does not need to be set). While tunnel mode
407 * and equivalent would set this to a tunnel encapsulation function
408 * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn
409 * call output2.
410 */
411 int (*output)(struct xfrm_state *x, struct sk_buff *skb);
412
413 struct xfrm_state_afinfo *afinfo;
414 struct module *owner;
415 unsigned int encap;
416 int flags;
417};
418
419/* Flags for xfrm_mode. */
420enum {
421 XFRM_MODE_FLAG_TUNNEL = 1,
422};
423
424extern int xfrm_register_mode(struct xfrm_mode *mode, int family);
425extern int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
426
427static inline int xfrm_af2proto(unsigned int family)
428{
429 switch(family) {
430 case AF_INET:
431 return IPPROTO_IPIP;
432 case AF_INET6:
433 return IPPROTO_IPV6;
434 default:
435 return 0;
436 }
437}
438
439static inline struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
440{
441 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
442 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
443 return x->inner_mode;
444 else
445 return x->inner_mode_iaf;
446}
447
448struct xfrm_tmpl {
449/* id in template is interpreted as:
450 * daddr - destination of tunnel, may be zero for transport mode.
451 * spi - zero to acquire spi. Not zero if spi is static, then
452 * daddr must be fixed too.
453 * proto - AH/ESP/IPCOMP
454 */
455 struct xfrm_id id;
456
457/* Source address of tunnel. Ignored, if it is not a tunnel. */
458 xfrm_address_t saddr;
459
460 unsigned short encap_family;
461
462 u32 reqid;
463
464/* Mode: transport, tunnel etc. */
465 u8 mode;
466
467/* Sharing mode: unique, this session only, this user only etc. */
468 u8 share;
469
470/* May skip this transfomration if no SA is found */
471 u8 optional;
472
473/* Skip aalgos/ealgos/calgos checks. */
474 u8 allalgs;
475
476/* Bit mask of algos allowed for acquisition */
477 u32 aalgos;
478 u32 ealgos;
479 u32 calgos;
480};
481
482#define XFRM_MAX_DEPTH 6
483
484struct xfrm_policy_walk_entry {
485 struct list_head all;
486 u8 dead;
487};
488
489struct xfrm_policy_walk {
490 struct xfrm_policy_walk_entry walk;
491 u8 type;
492 u32 seq;
493};
494
495struct xfrm_policy {
496#ifdef CONFIG_NET_NS
497 struct net *xp_net;
498#endif
499 struct hlist_node bydst;
500 struct hlist_node byidx;
501
502 /* This lock only affects elements except for entry. */
503 rwlock_t lock;
504 atomic_t refcnt;
505 struct timer_list timer;
506
507 struct flow_cache_object flo;
508 atomic_t genid;
509 u32 priority;
510 u32 index;
511 struct xfrm_mark mark;
512 struct xfrm_selector selector;
513 struct xfrm_lifetime_cfg lft;
514 struct xfrm_lifetime_cur curlft;
515 struct xfrm_policy_walk_entry walk;
516 u8 type;
517 u8 action;
518 u8 flags;
519 u8 xfrm_nr;
520 u16 family;
521 struct xfrm_sec_ctx *security;
522 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
523};
524
525static inline struct net *xp_net(const struct xfrm_policy *xp)
526{
527 return read_pnet(&xp->xp_net);
528}
529
530struct xfrm_kmaddress {
531 xfrm_address_t local;
532 xfrm_address_t remote;
533 u32 reserved;
534 u16 family;
535};
536
537struct xfrm_migrate {
538 xfrm_address_t old_daddr;
539 xfrm_address_t old_saddr;
540 xfrm_address_t new_daddr;
541 xfrm_address_t new_saddr;
542 u8 proto;
543 u8 mode;
544 u16 reserved;
545 u32 reqid;
546 u16 old_family;
547 u16 new_family;
548};
549
550#define XFRM_KM_TIMEOUT 30
551/* which seqno */
552#define XFRM_REPLAY_SEQ 1
553#define XFRM_REPLAY_OSEQ 2
554#define XFRM_REPLAY_SEQ_MASK 3
555/* what happened */
556#define XFRM_REPLAY_UPDATE XFRM_AE_CR
557#define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
558
559/* default aevent timeout in units of 100ms */
560#define XFRM_AE_ETIME 10
561/* Async Event timer multiplier */
562#define XFRM_AE_ETH_M 10
563/* default seq threshold size */
564#define XFRM_AE_SEQT_SIZE 2
565
566struct xfrm_mgr {
567 struct list_head list;
568 char *id;
569 int (*notify)(struct xfrm_state *x, const struct km_event *c);
570 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
571 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
572 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
573 int (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c);
574 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
575 int (*migrate)(const struct xfrm_selector *sel,
576 u8 dir, u8 type,
577 const struct xfrm_migrate *m,
578 int num_bundles,
579 const struct xfrm_kmaddress *k);
580};
581
582extern int xfrm_register_km(struct xfrm_mgr *km);
583extern int xfrm_unregister_km(struct xfrm_mgr *km);
584
585/*
586 * This structure is used for the duration where packets are being
587 * transformed by IPsec. As soon as the packet leaves IPsec the
588 * area beyond the generic IP part may be overwritten.
589 */
590struct xfrm_skb_cb {
591 union {
592 struct inet_skb_parm h4;
593 struct inet6_skb_parm h6;
594 } header;
595
596 /* Sequence number for replay protection. */
597 union {
598 struct {
599 __u32 low;
600 __u32 hi;
601 } output;
602 struct {
603 __be32 low;
604 __be32 hi;
605 } input;
606 } seq;
607};
608
609#define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
610
611/*
612 * This structure is used by the afinfo prepare_input/prepare_output functions
613 * to transmit header information to the mode input/output functions.
614 */
615struct xfrm_mode_skb_cb {
616 union {
617 struct inet_skb_parm h4;
618 struct inet6_skb_parm h6;
619 } header;
620
621 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
622 __be16 id;
623 __be16 frag_off;
624
625 /* IP header length (excluding options or extension headers). */
626 u8 ihl;
627
628 /* TOS for IPv4, class for IPv6. */
629 u8 tos;
630
631 /* TTL for IPv4, hop limitfor IPv6. */
632 u8 ttl;
633
634 /* Protocol for IPv4, NH for IPv6. */
635 u8 protocol;
636
637 /* Option length for IPv4, zero for IPv6. */
638 u8 optlen;
639
640 /* Used by IPv6 only, zero for IPv4. */
641 u8 flow_lbl[3];
642};
643
644#define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
645
646/*
647 * This structure is used by the input processing to locate the SPI and
648 * related information.
649 */
650struct xfrm_spi_skb_cb {
651 union {
652 struct inet_skb_parm h4;
653 struct inet6_skb_parm h6;
654 } header;
655
656 unsigned int daddroff;
657 unsigned int family;
658};
659
660#define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
661
662/* Audit Information */
663struct xfrm_audit {
664 u32 secid;
665 uid_t loginuid;
666 u32 sessionid;
667};
668
669#ifdef CONFIG_AUDITSYSCALL
670static inline struct audit_buffer *xfrm_audit_start(const char *op)
671{
672 struct audit_buffer *audit_buf = NULL;
673
674 if (audit_enabled == 0)
675 return NULL;
676 audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC,
677 AUDIT_MAC_IPSEC_EVENT);
678 if (audit_buf == NULL)
679 return NULL;
680 audit_log_format(audit_buf, "op=%s", op);
681 return audit_buf;
682}
683
684static inline void xfrm_audit_helper_usrinfo(uid_t auid, u32 ses, u32 secid,
685 struct audit_buffer *audit_buf)
686{
687 char *secctx;
688 u32 secctx_len;
689
690 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
691 if (secid != 0 &&
692 security_secid_to_secctx(secid, &secctx, &secctx_len) == 0) {
693 audit_log_format(audit_buf, " subj=%s", secctx);
694 security_release_secctx(secctx, secctx_len);
695 } else
696 audit_log_task_context(audit_buf);
697}
698
699extern void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
700 u32 auid, u32 ses, u32 secid);
701extern void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
702 u32 auid, u32 ses, u32 secid);
703extern void xfrm_audit_state_add(struct xfrm_state *x, int result,
704 u32 auid, u32 ses, u32 secid);
705extern void xfrm_audit_state_delete(struct xfrm_state *x, int result,
706 u32 auid, u32 ses, u32 secid);
707extern void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
708 struct sk_buff *skb);
709extern void xfrm_audit_state_replay(struct xfrm_state *x,
710 struct sk_buff *skb, __be32 net_seq);
711extern void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
712extern void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
713 __be32 net_spi, __be32 net_seq);
714extern void xfrm_audit_state_icvfail(struct xfrm_state *x,
715 struct sk_buff *skb, u8 proto);
716#else
717
718static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
719 u32 auid, u32 ses, u32 secid)
720{
721}
722
723static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
724 u32 auid, u32 ses, u32 secid)
725{
726}
727
728static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
729 u32 auid, u32 ses, u32 secid)
730{
731}
732
733static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
734 u32 auid, u32 ses, u32 secid)
735{
736}
737
738static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
739 struct sk_buff *skb)
740{
741}
742
743static inline void xfrm_audit_state_replay(struct xfrm_state *x,
744 struct sk_buff *skb, __be32 net_seq)
745{
746}
747
748static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
749 u16 family)
750{
751}
752
753static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
754 __be32 net_spi, __be32 net_seq)
755{
756}
757
758static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
759 struct sk_buff *skb, u8 proto)
760{
761}
762#endif /* CONFIG_AUDITSYSCALL */
763
764static inline void xfrm_pol_hold(struct xfrm_policy *policy)
765{
766 if (likely(policy != NULL))
767 atomic_inc(&policy->refcnt);
768}
769
770extern void xfrm_policy_destroy(struct xfrm_policy *policy);
771
772static inline void xfrm_pol_put(struct xfrm_policy *policy)
773{
774 if (atomic_dec_and_test(&policy->refcnt))
775 xfrm_policy_destroy(policy);
776}
777
778static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
779{
780 int i;
781 for (i = npols - 1; i >= 0; --i)
782 xfrm_pol_put(pols[i]);
783}
784
785extern void __xfrm_state_destroy(struct xfrm_state *);
786
787static inline void __xfrm_state_put(struct xfrm_state *x)
788{
789 atomic_dec(&x->refcnt);
790}
791
792static inline void xfrm_state_put(struct xfrm_state *x)
793{
794 if (atomic_dec_and_test(&x->refcnt))
795 __xfrm_state_destroy(x);
796}
797
798static inline void xfrm_state_hold(struct xfrm_state *x)
799{
800 atomic_inc(&x->refcnt);
801}
802
803static inline bool addr_match(const void *token1, const void *token2,
804 int prefixlen)
805{
806 const __be32 *a1 = token1;
807 const __be32 *a2 = token2;
808 int pdw;
809 int pbi;
810
811 pdw = prefixlen >> 5; /* num of whole u32 in prefix */
812 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
813
814 if (pdw)
815 if (memcmp(a1, a2, pdw << 2))
816 return false;
817
818 if (pbi) {
819 __be32 mask;
820
821 mask = htonl((0xffffffff) << (32 - pbi));
822
823 if ((a1[pdw] ^ a2[pdw]) & mask)
824 return false;
825 }
826
827 return true;
828}
829
830static __inline__
831__be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli)
832{
833 __be16 port;
834 switch(fl->flowi_proto) {
835 case IPPROTO_TCP:
836 case IPPROTO_UDP:
837 case IPPROTO_UDPLITE:
838 case IPPROTO_SCTP:
839 port = uli->ports.sport;
840 break;
841 case IPPROTO_ICMP:
842 case IPPROTO_ICMPV6:
843 port = htons(uli->icmpt.type);
844 break;
845 case IPPROTO_MH:
846 port = htons(uli->mht.type);
847 break;
848 case IPPROTO_GRE:
849 port = htons(ntohl(uli->gre_key) >> 16);
850 break;
851 default:
852 port = 0; /*XXX*/
853 }
854 return port;
855}
856
857static __inline__
858__be16 xfrm_flowi_dport(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.dport;
867 break;
868 case IPPROTO_ICMP:
869 case IPPROTO_ICMPV6:
870 port = htons(uli->icmpt.code);
871 break;
872 case IPPROTO_GRE:
873 port = htons(ntohl(uli->gre_key) & 0xffff);
874 break;
875 default:
876 port = 0; /*XXX*/
877 }
878 return port;
879}
880
881extern int xfrm_selector_match(const struct xfrm_selector *sel,
882 const struct flowi *fl,
883 unsigned short family);
884
885#ifdef CONFIG_SECURITY_NETWORK_XFRM
886/* If neither has a context --> match
887 * Otherwise, both must have a context and the sids, doi, alg must match
888 */
889static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
890{
891 return ((!s1 && !s2) ||
892 (s1 && s2 &&
893 (s1->ctx_sid == s2->ctx_sid) &&
894 (s1->ctx_doi == s2->ctx_doi) &&
895 (s1->ctx_alg == s2->ctx_alg)));
896}
897#else
898static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
899{
900 return 1;
901}
902#endif
903
904/* A struct encoding bundle of transformations to apply to some set of flow.
905 *
906 * dst->child points to the next element of bundle.
907 * dst->xfrm points to an instanse of transformer.
908 *
909 * Due to unfortunate limitations of current routing cache, which we
910 * have no time to fix, it mirrors struct rtable and bound to the same
911 * routing key, including saddr,daddr. However, we can have many of
912 * bundles differing by session id. All the bundles grow from a parent
913 * policy rule.
914 */
915struct xfrm_dst {
916 union {
917 struct dst_entry dst;
918 struct rtable rt;
919 struct rt6_info rt6;
920 } u;
921 struct dst_entry *route;
922 struct flow_cache_object flo;
923 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
924 int num_pols, num_xfrms;
925#ifdef CONFIG_XFRM_SUB_POLICY
926 struct flowi *origin;
927 struct xfrm_selector *partner;
928#endif
929 u32 xfrm_genid;
930 u32 policy_genid;
931 u32 route_mtu_cached;
932 u32 child_mtu_cached;
933 u32 route_cookie;
934 u32 path_cookie;
935};
936
937#ifdef CONFIG_XFRM
938static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
939{
940 xfrm_pols_put(xdst->pols, xdst->num_pols);
941 dst_release(xdst->route);
942 if (likely(xdst->u.dst.xfrm))
943 xfrm_state_put(xdst->u.dst.xfrm);
944#ifdef CONFIG_XFRM_SUB_POLICY
945 kfree(xdst->origin);
946 xdst->origin = NULL;
947 kfree(xdst->partner);
948 xdst->partner = NULL;
949#endif
950}
951#endif
952
953extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
954
955struct sec_path {
956 atomic_t refcnt;
957 int len;
958 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
959};
960
961static inline int secpath_exists(struct sk_buff *skb)
962{
963#ifdef CONFIG_XFRM
964 return skb->sp != NULL;
965#else
966 return 0;
967#endif
968}
969
970static inline struct sec_path *
971secpath_get(struct sec_path *sp)
972{
973 if (sp)
974 atomic_inc(&sp->refcnt);
975 return sp;
976}
977
978extern void __secpath_destroy(struct sec_path *sp);
979
980static inline void
981secpath_put(struct sec_path *sp)
982{
983 if (sp && atomic_dec_and_test(&sp->refcnt))
984 __secpath_destroy(sp);
985}
986
987extern struct sec_path *secpath_dup(struct sec_path *src);
988
989static inline void
990secpath_reset(struct sk_buff *skb)
991{
992#ifdef CONFIG_XFRM
993 secpath_put(skb->sp);
994 skb->sp = NULL;
995#endif
996}
997
998static inline int
999xfrm_addr_any(const xfrm_address_t *addr, unsigned short family)
1000{
1001 switch (family) {
1002 case AF_INET:
1003 return addr->a4 == 0;
1004 case AF_INET6:
1005 return ipv6_addr_any((struct in6_addr *)&addr->a6);
1006 }
1007 return 0;
1008}
1009
1010static inline int
1011__xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1012{
1013 return (tmpl->saddr.a4 &&
1014 tmpl->saddr.a4 != x->props.saddr.a4);
1015}
1016
1017static inline int
1018__xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1019{
1020 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
1021 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
1022}
1023
1024static inline int
1025xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family)
1026{
1027 switch (family) {
1028 case AF_INET:
1029 return __xfrm4_state_addr_cmp(tmpl, x);
1030 case AF_INET6:
1031 return __xfrm6_state_addr_cmp(tmpl, x);
1032 }
1033 return !0;
1034}
1035
1036#ifdef CONFIG_XFRM
1037extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
1038
1039static inline int __xfrm_policy_check2(struct sock *sk, int dir,
1040 struct sk_buff *skb,
1041 unsigned int family, int reverse)
1042{
1043 struct net *net = dev_net(skb->dev);
1044 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
1045
1046 if (sk && sk->sk_policy[XFRM_POLICY_IN])
1047 return __xfrm_policy_check(sk, ndir, skb, family);
1048
1049 return (!net->xfrm.policy_count[dir] && !skb->sp) ||
1050 (skb_dst(skb)->flags & DST_NOPOLICY) ||
1051 __xfrm_policy_check(sk, ndir, skb, family);
1052}
1053
1054static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1055{
1056 return __xfrm_policy_check2(sk, dir, skb, family, 0);
1057}
1058
1059static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1060{
1061 return xfrm_policy_check(sk, dir, skb, AF_INET);
1062}
1063
1064static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1065{
1066 return xfrm_policy_check(sk, dir, skb, AF_INET6);
1067}
1068
1069static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1070 struct sk_buff *skb)
1071{
1072 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1073}
1074
1075static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1076 struct sk_buff *skb)
1077{
1078 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1079}
1080
1081extern int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1082 unsigned int family, int reverse);
1083
1084static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1085 unsigned int family)
1086{
1087 return __xfrm_decode_session(skb, fl, family, 0);
1088}
1089
1090static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1091 struct flowi *fl,
1092 unsigned int family)
1093{
1094 return __xfrm_decode_session(skb, fl, family, 1);
1095}
1096
1097extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1098
1099static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1100{
1101 struct net *net = dev_net(skb->dev);
1102
1103 return !net->xfrm.policy_count[XFRM_POLICY_OUT] ||
1104 (skb_dst(skb)->flags & DST_NOXFRM) ||
1105 __xfrm_route_forward(skb, family);
1106}
1107
1108static inline int xfrm4_route_forward(struct sk_buff *skb)
1109{
1110 return xfrm_route_forward(skb, AF_INET);
1111}
1112
1113static inline int xfrm6_route_forward(struct sk_buff *skb)
1114{
1115 return xfrm_route_forward(skb, AF_INET6);
1116}
1117
1118extern int __xfrm_sk_clone_policy(struct sock *sk);
1119
1120static inline int xfrm_sk_clone_policy(struct sock *sk)
1121{
1122 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
1123 return __xfrm_sk_clone_policy(sk);
1124 return 0;
1125}
1126
1127extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1128
1129static inline void xfrm_sk_free_policy(struct sock *sk)
1130{
1131 if (unlikely(sk->sk_policy[0] != NULL)) {
1132 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
1133 sk->sk_policy[0] = NULL;
1134 }
1135 if (unlikely(sk->sk_policy[1] != NULL)) {
1136 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
1137 sk->sk_policy[1] = NULL;
1138 }
1139}
1140
1141#else
1142
1143static inline void xfrm_sk_free_policy(struct sock *sk) {}
1144static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
1145static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1146static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1147static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1148{
1149 return 1;
1150}
1151static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1152{
1153 return 1;
1154}
1155static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1156{
1157 return 1;
1158}
1159static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1160 struct flowi *fl,
1161 unsigned int family)
1162{
1163 return -ENOSYS;
1164}
1165static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1166 struct sk_buff *skb)
1167{
1168 return 1;
1169}
1170static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1171 struct sk_buff *skb)
1172{
1173 return 1;
1174}
1175#endif
1176
1177static __inline__
1178xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family)
1179{
1180 switch (family){
1181 case AF_INET:
1182 return (xfrm_address_t *)&fl->u.ip4.daddr;
1183 case AF_INET6:
1184 return (xfrm_address_t *)&fl->u.ip6.daddr;
1185 }
1186 return NULL;
1187}
1188
1189static __inline__
1190xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family)
1191{
1192 switch (family){
1193 case AF_INET:
1194 return (xfrm_address_t *)&fl->u.ip4.saddr;
1195 case AF_INET6:
1196 return (xfrm_address_t *)&fl->u.ip6.saddr;
1197 }
1198 return NULL;
1199}
1200
1201static __inline__
1202void xfrm_flowi_addr_get(const struct flowi *fl,
1203 xfrm_address_t *saddr, xfrm_address_t *daddr,
1204 unsigned short family)
1205{
1206 switch(family) {
1207 case AF_INET:
1208 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4));
1209 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4));
1210 break;
1211 case AF_INET6:
1212 ipv6_addr_copy((struct in6_addr *)&saddr->a6, &fl->u.ip6.saddr);
1213 ipv6_addr_copy((struct in6_addr *)&daddr->a6, &fl->u.ip6.daddr);
1214 break;
1215 }
1216}
1217
1218static __inline__ int
1219__xfrm4_state_addr_check(const struct xfrm_state *x,
1220 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1221{
1222 if (daddr->a4 == x->id.daddr.a4 &&
1223 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1224 return 1;
1225 return 0;
1226}
1227
1228static __inline__ int
1229__xfrm6_state_addr_check(const struct xfrm_state *x,
1230 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1231{
1232 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1233 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
1234 ipv6_addr_any((struct in6_addr *)saddr) ||
1235 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1236 return 1;
1237 return 0;
1238}
1239
1240static __inline__ int
1241xfrm_state_addr_check(const struct xfrm_state *x,
1242 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1243 unsigned short family)
1244{
1245 switch (family) {
1246 case AF_INET:
1247 return __xfrm4_state_addr_check(x, daddr, saddr);
1248 case AF_INET6:
1249 return __xfrm6_state_addr_check(x, daddr, saddr);
1250 }
1251 return 0;
1252}
1253
1254static __inline__ int
1255xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl,
1256 unsigned short family)
1257{
1258 switch (family) {
1259 case AF_INET:
1260 return __xfrm4_state_addr_check(x,
1261 (const xfrm_address_t *)&fl->u.ip4.daddr,
1262 (const xfrm_address_t *)&fl->u.ip4.saddr);
1263 case AF_INET6:
1264 return __xfrm6_state_addr_check(x,
1265 (const xfrm_address_t *)&fl->u.ip6.daddr,
1266 (const xfrm_address_t *)&fl->u.ip6.saddr);
1267 }
1268 return 0;
1269}
1270
1271static inline int xfrm_state_kern(const struct xfrm_state *x)
1272{
1273 return atomic_read(&x->tunnel_users);
1274}
1275
1276static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1277{
1278 return (!userproto || proto == userproto ||
1279 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1280 proto == IPPROTO_ESP ||
1281 proto == IPPROTO_COMP)));
1282}
1283
1284/*
1285 * xfrm algorithm information
1286 */
1287struct xfrm_algo_aead_info {
1288 u16 icv_truncbits;
1289};
1290
1291struct xfrm_algo_auth_info {
1292 u16 icv_truncbits;
1293 u16 icv_fullbits;
1294};
1295
1296struct xfrm_algo_encr_info {
1297 u16 blockbits;
1298 u16 defkeybits;
1299};
1300
1301struct xfrm_algo_comp_info {
1302 u16 threshold;
1303};
1304
1305struct xfrm_algo_desc {
1306 char *name;
1307 char *compat;
1308 u8 available:1;
1309 union {
1310 struct xfrm_algo_aead_info aead;
1311 struct xfrm_algo_auth_info auth;
1312 struct xfrm_algo_encr_info encr;
1313 struct xfrm_algo_comp_info comp;
1314 } uinfo;
1315 struct sadb_alg desc;
1316};
1317
1318/* XFRM tunnel handlers. */
1319struct xfrm_tunnel {
1320 int (*handler)(struct sk_buff *skb);
1321 int (*err_handler)(struct sk_buff *skb, u32 info);
1322
1323 struct xfrm_tunnel __rcu *next;
1324 int priority;
1325};
1326
1327struct xfrm6_tunnel {
1328 int (*handler)(struct sk_buff *skb);
1329 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1330 u8 type, u8 code, int offset, __be32 info);
1331 struct xfrm6_tunnel __rcu *next;
1332 int priority;
1333};
1334
1335extern void xfrm_init(void);
1336extern void xfrm4_init(int rt_hash_size);
1337extern int xfrm_state_init(struct net *net);
1338extern void xfrm_state_fini(struct net *net);
1339extern void xfrm4_state_init(void);
1340#ifdef CONFIG_XFRM
1341extern int xfrm6_init(void);
1342extern void xfrm6_fini(void);
1343extern int xfrm6_state_init(void);
1344extern void xfrm6_state_fini(void);
1345#else
1346static inline int xfrm6_init(void)
1347{
1348 return 0;
1349}
1350static inline void xfrm6_fini(void)
1351{
1352 ;
1353}
1354#endif
1355
1356#ifdef CONFIG_XFRM_STATISTICS
1357extern int xfrm_proc_init(struct net *net);
1358extern void xfrm_proc_fini(struct net *net);
1359#endif
1360
1361extern int xfrm_sysctl_init(struct net *net);
1362#ifdef CONFIG_SYSCTL
1363extern void xfrm_sysctl_fini(struct net *net);
1364#else
1365static inline void xfrm_sysctl_fini(struct net *net)
1366{
1367}
1368#endif
1369
1370extern void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto);
1371extern int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1372 int (*func)(struct xfrm_state *, int, void*), void *);
1373extern void xfrm_state_walk_done(struct xfrm_state_walk *walk);
1374extern struct xfrm_state *xfrm_state_alloc(struct net *net);
1375extern struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr,
1376 const xfrm_address_t *saddr,
1377 const struct flowi *fl,
1378 struct xfrm_tmpl *tmpl,
1379 struct xfrm_policy *pol, int *err,
1380 unsigned short family);
1381extern struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark,
1382 xfrm_address_t *daddr,
1383 xfrm_address_t *saddr,
1384 unsigned short family,
1385 u8 mode, u8 proto, u32 reqid);
1386extern int xfrm_state_check_expire(struct xfrm_state *x);
1387extern void xfrm_state_insert(struct xfrm_state *x);
1388extern int xfrm_state_add(struct xfrm_state *x);
1389extern int xfrm_state_update(struct xfrm_state *x);
1390extern struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1391 const xfrm_address_t *daddr, __be32 spi,
1392 u8 proto, unsigned short family);
1393extern struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1394 const xfrm_address_t *daddr,
1395 const xfrm_address_t *saddr,
1396 u8 proto,
1397 unsigned short family);
1398#ifdef CONFIG_XFRM_SUB_POLICY
1399extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1400 int n, unsigned short family);
1401extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1402 int n, unsigned short family);
1403#else
1404static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1405 int n, unsigned short family)
1406{
1407 return -ENOSYS;
1408}
1409
1410static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1411 int n, unsigned short family)
1412{
1413 return -ENOSYS;
1414}
1415#endif
1416
1417struct xfrmk_sadinfo {
1418 u32 sadhcnt; /* current hash bkts */
1419 u32 sadhmcnt; /* max allowed hash bkts */
1420 u32 sadcnt; /* current running count */
1421};
1422
1423struct xfrmk_spdinfo {
1424 u32 incnt;
1425 u32 outcnt;
1426 u32 fwdcnt;
1427 u32 inscnt;
1428 u32 outscnt;
1429 u32 fwdscnt;
1430 u32 spdhcnt;
1431 u32 spdhmcnt;
1432};
1433
1434extern struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark,
1435 u32 seq);
1436extern int xfrm_state_delete(struct xfrm_state *x);
1437extern int xfrm_state_flush(struct net *net, u8 proto, struct xfrm_audit *audit_info);
1438extern void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1439extern void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1440extern u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq);
1441extern int xfrm_init_replay(struct xfrm_state *x);
1442extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1443extern int __xfrm_init_state(struct xfrm_state *x, bool init_replay);
1444extern int xfrm_init_state(struct xfrm_state *x);
1445extern int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
1446extern int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi,
1447 int encap_type);
1448extern int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1449extern int xfrm_output_resume(struct sk_buff *skb, int err);
1450extern int xfrm_output(struct sk_buff *skb);
1451extern int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1452extern int xfrm4_extract_header(struct sk_buff *skb);
1453extern int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1454extern int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1455 int encap_type);
1456extern int xfrm4_transport_finish(struct sk_buff *skb, int async);
1457extern int xfrm4_rcv(struct sk_buff *skb);
1458
1459static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1460{
1461 return xfrm4_rcv_encap(skb, nexthdr, spi, 0);
1462}
1463
1464extern int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1465extern int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1466extern int xfrm4_output(struct sk_buff *skb);
1467extern int xfrm4_output_finish(struct sk_buff *skb);
1468extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1469extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1470extern int xfrm6_extract_header(struct sk_buff *skb);
1471extern int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1472extern int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi);
1473extern int xfrm6_transport_finish(struct sk_buff *skb, int async);
1474extern int xfrm6_rcv(struct sk_buff *skb);
1475extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1476 xfrm_address_t *saddr, u8 proto);
1477extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1478extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1479extern __be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1480extern __be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr);
1481extern int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1482extern int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1483extern int xfrm6_output(struct sk_buff *skb);
1484extern int xfrm6_output_finish(struct sk_buff *skb);
1485extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1486 u8 **prevhdr);
1487
1488#ifdef CONFIG_XFRM
1489extern int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1490extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
1491#else
1492static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1493{
1494 return -ENOPROTOOPT;
1495}
1496
1497static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1498{
1499 /* should not happen */
1500 kfree_skb(skb);
1501 return 0;
1502}
1503#endif
1504
1505struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1506
1507extern void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1508extern int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1509 int (*func)(struct xfrm_policy *, int, int, void*), void *);
1510extern void xfrm_policy_walk_done(struct xfrm_policy_walk *walk);
1511int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1512struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark,
1513 u8 type, int dir,
1514 struct xfrm_selector *sel,
1515 struct xfrm_sec_ctx *ctx, int delete,
1516 int *err);
1517struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8, int dir, u32 id, int delete, int *err);
1518int xfrm_policy_flush(struct net *net, u8 type, struct xfrm_audit *audit_info);
1519u32 xfrm_get_acqseq(void);
1520extern int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1521struct xfrm_state *xfrm_find_acq(struct net *net, struct xfrm_mark *mark,
1522 u8 mode, u32 reqid, u8 proto,
1523 const xfrm_address_t *daddr,
1524 const xfrm_address_t *saddr, int create,
1525 unsigned short family);
1526extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1527
1528#ifdef CONFIG_XFRM_MIGRATE
1529extern int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1530 const struct xfrm_migrate *m, int num_bundles,
1531 const struct xfrm_kmaddress *k);
1532extern struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m);
1533extern struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
1534 struct xfrm_migrate *m);
1535extern int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1536 struct xfrm_migrate *m, int num_bundles,
1537 struct xfrm_kmaddress *k);
1538#endif
1539
1540extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1541extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid);
1542extern int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
1543
1544extern void xfrm_input_init(void);
1545extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1546
1547extern void xfrm_probe_algs(void);
1548extern int xfrm_count_auth_supported(void);
1549extern int xfrm_count_enc_supported(void);
1550extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1551extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1552extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1553extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1554extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1555extern struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe);
1556extern struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe);
1557extern struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe);
1558extern struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len,
1559 int probe);
1560
1561struct hash_desc;
1562struct scatterlist;
1563typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *,
1564 unsigned int);
1565
1566static inline int xfrm_addr_cmp(const xfrm_address_t *a,
1567 const xfrm_address_t *b,
1568 int family)
1569{
1570 switch (family) {
1571 default:
1572 case AF_INET:
1573 return (__force u32)a->a4 - (__force u32)b->a4;
1574 case AF_INET6:
1575 return ipv6_addr_cmp((const struct in6_addr *)a,
1576 (const struct in6_addr *)b);
1577 }
1578}
1579
1580static inline int xfrm_policy_id2dir(u32 index)
1581{
1582 return index & 7;
1583}
1584
1585#ifdef CONFIG_XFRM
1586static inline int xfrm_aevent_is_on(struct net *net)
1587{
1588 struct sock *nlsk;
1589 int ret = 0;
1590
1591 rcu_read_lock();
1592 nlsk = rcu_dereference(net->xfrm.nlsk);
1593 if (nlsk)
1594 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1595 rcu_read_unlock();
1596 return ret;
1597}
1598#endif
1599
1600static inline int xfrm_alg_len(const struct xfrm_algo *alg)
1601{
1602 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1603}
1604
1605static inline int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg)
1606{
1607 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1608}
1609
1610static inline int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn)
1611{
1612 return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32);
1613}
1614
1615#ifdef CONFIG_XFRM_MIGRATE
1616static inline int xfrm_replay_clone(struct xfrm_state *x,
1617 struct xfrm_state *orig)
1618{
1619 x->replay_esn = kzalloc(xfrm_replay_state_esn_len(orig->replay_esn),
1620 GFP_KERNEL);
1621 if (!x->replay_esn)
1622 return -ENOMEM;
1623
1624 x->replay_esn->bmp_len = orig->replay_esn->bmp_len;
1625 x->replay_esn->replay_window = orig->replay_esn->replay_window;
1626
1627 x->preplay_esn = kmemdup(x->replay_esn,
1628 xfrm_replay_state_esn_len(x->replay_esn),
1629 GFP_KERNEL);
1630 if (!x->preplay_esn) {
1631 kfree(x->replay_esn);
1632 return -ENOMEM;
1633 }
1634
1635 return 0;
1636}
1637
1638static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1639{
1640 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1641}
1642
1643static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1644{
1645 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1646}
1647
1648static inline void xfrm_states_put(struct xfrm_state **states, int n)
1649{
1650 int i;
1651 for (i = 0; i < n; i++)
1652 xfrm_state_put(*(states + i));
1653}
1654
1655static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1656{
1657 int i;
1658 for (i = 0; i < n; i++)
1659 xfrm_state_delete(*(states + i));
1660}
1661#endif
1662
1663#ifdef CONFIG_XFRM
1664static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1665{
1666 return skb->sp->xvec[skb->sp->len - 1];
1667}
1668#endif
1669
1670static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
1671{
1672 if (attrs[XFRMA_MARK])
1673 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark));
1674 else
1675 m->v = m->m = 0;
1676
1677 return m->v & m->m;
1678}
1679
1680static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m)
1681{
1682 if (m->m | m->v)
1683 NLA_PUT(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
1684 return 0;
1685
1686nla_put_failure:
1687 return -1;
1688}
1689
1690#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
129struct xfrm_state_offload {
130 struct net_device *dev;
131 struct net_device *real_dev;
132 unsigned long offload_handle;
133 unsigned int num_exthdrs;
134 u8 flags;
135};
136
137struct xfrm_mode {
138 u8 encap;
139 u8 family;
140 u8 flags;
141};
142
143/* Flags for xfrm_mode. */
144enum {
145 XFRM_MODE_FLAG_TUNNEL = 1,
146};
147
148/* Full description of state of transformer. */
149struct xfrm_state {
150 possible_net_t xs_net;
151 union {
152 struct hlist_node gclist;
153 struct hlist_node bydst;
154 };
155 struct hlist_node bysrc;
156 struct hlist_node byspi;
157
158 refcount_t refcnt;
159 spinlock_t lock;
160
161 struct xfrm_id id;
162 struct xfrm_selector sel;
163 struct xfrm_mark mark;
164 u32 if_id;
165 u32 tfcpad;
166
167 u32 genid;
168
169 /* Key manager bits */
170 struct xfrm_state_walk km;
171
172 /* Parameters of this state. */
173 struct {
174 u32 reqid;
175 u8 mode;
176 u8 replay_window;
177 u8 aalgo, ealgo, calgo;
178 u8 flags;
179 u16 family;
180 xfrm_address_t saddr;
181 int header_len;
182 int trailer_len;
183 u32 extra_flags;
184 struct xfrm_mark smark;
185 } props;
186
187 struct xfrm_lifetime_cfg lft;
188
189 /* Data for transformer */
190 struct xfrm_algo_auth *aalg;
191 struct xfrm_algo *ealg;
192 struct xfrm_algo *calg;
193 struct xfrm_algo_aead *aead;
194 const char *geniv;
195
196 /* Data for encapsulator */
197 struct xfrm_encap_tmpl *encap;
198 struct sock __rcu *encap_sk;
199
200 /* Data for care-of address */
201 xfrm_address_t *coaddr;
202
203 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
204 struct xfrm_state *tunnel;
205
206 /* If a tunnel, number of users + 1 */
207 atomic_t tunnel_users;
208
209 /* State for replay detection */
210 struct xfrm_replay_state replay;
211 struct xfrm_replay_state_esn *replay_esn;
212
213 /* Replay detection state at the time we sent the last notification */
214 struct xfrm_replay_state preplay;
215 struct xfrm_replay_state_esn *preplay_esn;
216
217 /* The functions for replay detection. */
218 const struct xfrm_replay *repl;
219
220 /* internal flag that only holds state for delayed aevent at the
221 * moment
222 */
223 u32 xflags;
224
225 /* Replay detection notification settings */
226 u32 replay_maxage;
227 u32 replay_maxdiff;
228
229 /* Replay detection notification timer */
230 struct timer_list rtimer;
231
232 /* Statistics */
233 struct xfrm_stats stats;
234
235 struct xfrm_lifetime_cur curlft;
236 struct hrtimer mtimer;
237
238 struct xfrm_state_offload xso;
239
240 /* used to fix curlft->add_time when changing date */
241 long saved_tmo;
242
243 /* Last used time */
244 time64_t lastused;
245
246 struct page_frag xfrag;
247
248 /* Reference to data common to all the instances of this
249 * transformer. */
250 const struct xfrm_type *type;
251 struct xfrm_mode inner_mode;
252 struct xfrm_mode inner_mode_iaf;
253 struct xfrm_mode outer_mode;
254
255 const struct xfrm_type_offload *type_offload;
256
257 /* Security context */
258 struct xfrm_sec_ctx *security;
259
260 /* Private data of this transformer, format is opaque,
261 * interpreted by xfrm_type methods. */
262 void *data;
263};
264
265static inline struct net *xs_net(struct xfrm_state *x)
266{
267 return read_pnet(&x->xs_net);
268}
269
270/* xflags - make enum if more show up */
271#define XFRM_TIME_DEFER 1
272#define XFRM_SOFT_EXPIRE 2
273
274enum {
275 XFRM_STATE_VOID,
276 XFRM_STATE_ACQ,
277 XFRM_STATE_VALID,
278 XFRM_STATE_ERROR,
279 XFRM_STATE_EXPIRED,
280 XFRM_STATE_DEAD
281};
282
283/* callback structure passed from either netlink or pfkey */
284struct km_event {
285 union {
286 u32 hard;
287 u32 proto;
288 u32 byid;
289 u32 aevent;
290 u32 type;
291 } data;
292
293 u32 seq;
294 u32 portid;
295 u32 event;
296 struct net *net;
297};
298
299struct xfrm_replay {
300 void (*advance)(struct xfrm_state *x, __be32 net_seq);
301 int (*check)(struct xfrm_state *x,
302 struct sk_buff *skb,
303 __be32 net_seq);
304 int (*recheck)(struct xfrm_state *x,
305 struct sk_buff *skb,
306 __be32 net_seq);
307 void (*notify)(struct xfrm_state *x, int event);
308 int (*overflow)(struct xfrm_state *x, struct sk_buff *skb);
309};
310
311struct xfrm_if_cb {
312 struct xfrm_if *(*decode_session)(struct sk_buff *skb,
313 unsigned short family);
314};
315
316void xfrm_if_register_cb(const struct xfrm_if_cb *ifcb);
317void xfrm_if_unregister_cb(void);
318
319struct net_device;
320struct xfrm_type;
321struct xfrm_dst;
322struct xfrm_policy_afinfo {
323 struct dst_ops *dst_ops;
324 struct dst_entry *(*dst_lookup)(struct net *net,
325 int tos, int oif,
326 const xfrm_address_t *saddr,
327 const xfrm_address_t *daddr,
328 u32 mark);
329 int (*get_saddr)(struct net *net, int oif,
330 xfrm_address_t *saddr,
331 xfrm_address_t *daddr,
332 u32 mark);
333 int (*fill_dst)(struct xfrm_dst *xdst,
334 struct net_device *dev,
335 const struct flowi *fl);
336 struct dst_entry *(*blackhole_route)(struct net *net, struct dst_entry *orig);
337};
338
339int xfrm_policy_register_afinfo(const struct xfrm_policy_afinfo *afinfo, int family);
340void xfrm_policy_unregister_afinfo(const struct xfrm_policy_afinfo *afinfo);
341void km_policy_notify(struct xfrm_policy *xp, int dir,
342 const struct km_event *c);
343void km_state_notify(struct xfrm_state *x, const struct km_event *c);
344
345struct xfrm_tmpl;
346int km_query(struct xfrm_state *x, struct xfrm_tmpl *t,
347 struct xfrm_policy *pol);
348void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
349int __xfrm_state_delete(struct xfrm_state *x);
350
351struct xfrm_state_afinfo {
352 u8 family;
353 u8 proto;
354
355 const struct xfrm_type_offload *type_offload_esp;
356
357 const struct xfrm_type *type_esp;
358 const struct xfrm_type *type_ipip;
359 const struct xfrm_type *type_ipip6;
360 const struct xfrm_type *type_comp;
361 const struct xfrm_type *type_ah;
362 const struct xfrm_type *type_routing;
363 const struct xfrm_type *type_dstopts;
364
365 int (*output)(struct net *net, struct sock *sk, struct sk_buff *skb);
366 int (*transport_finish)(struct sk_buff *skb,
367 int async);
368 void (*local_error)(struct sk_buff *skb, u32 mtu);
369};
370
371int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
372int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
373struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family);
374struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family);
375
376struct xfrm_input_afinfo {
377 u8 family;
378 bool is_ipip;
379 int (*callback)(struct sk_buff *skb, u8 protocol,
380 int err);
381};
382
383int xfrm_input_register_afinfo(const struct xfrm_input_afinfo *afinfo);
384int xfrm_input_unregister_afinfo(const struct xfrm_input_afinfo *afinfo);
385
386void xfrm_flush_gc(void);
387void xfrm_state_delete_tunnel(struct xfrm_state *x);
388
389struct xfrm_type {
390 char *description;
391 struct module *owner;
392 u8 proto;
393 u8 flags;
394#define XFRM_TYPE_NON_FRAGMENT 1
395#define XFRM_TYPE_REPLAY_PROT 2
396#define XFRM_TYPE_LOCAL_COADDR 4
397#define XFRM_TYPE_REMOTE_COADDR 8
398
399 int (*init_state)(struct xfrm_state *x);
400 void (*destructor)(struct xfrm_state *);
401 int (*input)(struct xfrm_state *, struct sk_buff *skb);
402 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
403 int (*reject)(struct xfrm_state *, struct sk_buff *,
404 const struct flowi *);
405 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
406};
407
408int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
409void xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
410
411struct xfrm_type_offload {
412 char *description;
413 struct module *owner;
414 u8 proto;
415 void (*encap)(struct xfrm_state *, struct sk_buff *pskb);
416 int (*input_tail)(struct xfrm_state *x, struct sk_buff *skb);
417 int (*xmit)(struct xfrm_state *, struct sk_buff *pskb, netdev_features_t features);
418};
419
420int xfrm_register_type_offload(const struct xfrm_type_offload *type, unsigned short family);
421void xfrm_unregister_type_offload(const struct xfrm_type_offload *type, unsigned short family);
422
423static inline int xfrm_af2proto(unsigned int family)
424{
425 switch(family) {
426 case AF_INET:
427 return IPPROTO_IPIP;
428 case AF_INET6:
429 return IPPROTO_IPV6;
430 default:
431 return 0;
432 }
433}
434
435static inline const struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
436{
437 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
438 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
439 return &x->inner_mode;
440 else
441 return &x->inner_mode_iaf;
442}
443
444struct xfrm_tmpl {
445/* id in template is interpreted as:
446 * daddr - destination of tunnel, may be zero for transport mode.
447 * spi - zero to acquire spi. Not zero if spi is static, then
448 * daddr must be fixed too.
449 * proto - AH/ESP/IPCOMP
450 */
451 struct xfrm_id id;
452
453/* Source address of tunnel. Ignored, if it is not a tunnel. */
454 xfrm_address_t saddr;
455
456 unsigned short encap_family;
457
458 u32 reqid;
459
460/* Mode: transport, tunnel etc. */
461 u8 mode;
462
463/* Sharing mode: unique, this session only, this user only etc. */
464 u8 share;
465
466/* May skip this transfomration if no SA is found */
467 u8 optional;
468
469/* Skip aalgos/ealgos/calgos checks. */
470 u8 allalgs;
471
472/* Bit mask of algos allowed for acquisition */
473 u32 aalgos;
474 u32 ealgos;
475 u32 calgos;
476};
477
478#define XFRM_MAX_DEPTH 6
479#define XFRM_MAX_OFFLOAD_DEPTH 1
480
481struct xfrm_policy_walk_entry {
482 struct list_head all;
483 u8 dead;
484};
485
486struct xfrm_policy_walk {
487 struct xfrm_policy_walk_entry walk;
488 u8 type;
489 u32 seq;
490};
491
492struct xfrm_policy_queue {
493 struct sk_buff_head hold_queue;
494 struct timer_list hold_timer;
495 unsigned long timeout;
496};
497
498struct xfrm_policy {
499 possible_net_t xp_net;
500 struct hlist_node bydst;
501 struct hlist_node byidx;
502
503 /* This lock only affects elements except for entry. */
504 rwlock_t lock;
505 refcount_t refcnt;
506 u32 pos;
507 struct timer_list timer;
508
509 atomic_t genid;
510 u32 priority;
511 u32 index;
512 u32 if_id;
513 struct xfrm_mark mark;
514 struct xfrm_selector selector;
515 struct xfrm_lifetime_cfg lft;
516 struct xfrm_lifetime_cur curlft;
517 struct xfrm_policy_walk_entry walk;
518 struct xfrm_policy_queue polq;
519 bool bydst_reinsert;
520 u8 type;
521 u8 action;
522 u8 flags;
523 u8 xfrm_nr;
524 u16 family;
525 struct xfrm_sec_ctx *security;
526 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
527 struct hlist_node bydst_inexact_list;
528 struct rcu_head rcu;
529};
530
531static inline struct net *xp_net(const struct xfrm_policy *xp)
532{
533 return read_pnet(&xp->xp_net);
534}
535
536struct xfrm_kmaddress {
537 xfrm_address_t local;
538 xfrm_address_t remote;
539 u32 reserved;
540 u16 family;
541};
542
543struct xfrm_migrate {
544 xfrm_address_t old_daddr;
545 xfrm_address_t old_saddr;
546 xfrm_address_t new_daddr;
547 xfrm_address_t new_saddr;
548 u8 proto;
549 u8 mode;
550 u16 reserved;
551 u32 reqid;
552 u16 old_family;
553 u16 new_family;
554};
555
556#define XFRM_KM_TIMEOUT 30
557/* what happened */
558#define XFRM_REPLAY_UPDATE XFRM_AE_CR
559#define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
560
561/* default aevent timeout in units of 100ms */
562#define XFRM_AE_ETIME 10
563/* Async Event timer multiplier */
564#define XFRM_AE_ETH_M 10
565/* default seq threshold size */
566#define XFRM_AE_SEQT_SIZE 2
567
568struct xfrm_mgr {
569 struct list_head list;
570 int (*notify)(struct xfrm_state *x, const struct km_event *c);
571 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp);
572 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
573 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
574 int (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c);
575 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
576 int (*migrate)(const struct xfrm_selector *sel,
577 u8 dir, u8 type,
578 const struct xfrm_migrate *m,
579 int num_bundles,
580 const struct xfrm_kmaddress *k,
581 const struct xfrm_encap_tmpl *encap);
582 bool (*is_alive)(const struct km_event *c);
583};
584
585int xfrm_register_km(struct xfrm_mgr *km);
586int xfrm_unregister_km(struct xfrm_mgr *km);
587
588struct xfrm_tunnel_skb_cb {
589 union {
590 struct inet_skb_parm h4;
591 struct inet6_skb_parm h6;
592 } header;
593
594 union {
595 struct ip_tunnel *ip4;
596 struct ip6_tnl *ip6;
597 } tunnel;
598};
599
600#define XFRM_TUNNEL_SKB_CB(__skb) ((struct xfrm_tunnel_skb_cb *)&((__skb)->cb[0]))
601
602/*
603 * This structure is used for the duration where packets are being
604 * transformed by IPsec. As soon as the packet leaves IPsec the
605 * area beyond the generic IP part may be overwritten.
606 */
607struct xfrm_skb_cb {
608 struct xfrm_tunnel_skb_cb header;
609
610 /* Sequence number for replay protection. */
611 union {
612 struct {
613 __u32 low;
614 __u32 hi;
615 } output;
616 struct {
617 __be32 low;
618 __be32 hi;
619 } input;
620 } seq;
621};
622
623#define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
624
625/*
626 * This structure is used by the afinfo prepare_input/prepare_output functions
627 * to transmit header information to the mode input/output functions.
628 */
629struct xfrm_mode_skb_cb {
630 struct xfrm_tunnel_skb_cb header;
631
632 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
633 __be16 id;
634 __be16 frag_off;
635
636 /* IP header length (excluding options or extension headers). */
637 u8 ihl;
638
639 /* TOS for IPv4, class for IPv6. */
640 u8 tos;
641
642 /* TTL for IPv4, hop limitfor IPv6. */
643 u8 ttl;
644
645 /* Protocol for IPv4, NH for IPv6. */
646 u8 protocol;
647
648 /* Option length for IPv4, zero for IPv6. */
649 u8 optlen;
650
651 /* Used by IPv6 only, zero for IPv4. */
652 u8 flow_lbl[3];
653};
654
655#define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
656
657/*
658 * This structure is used by the input processing to locate the SPI and
659 * related information.
660 */
661struct xfrm_spi_skb_cb {
662 struct xfrm_tunnel_skb_cb header;
663
664 unsigned int daddroff;
665 unsigned int family;
666 __be32 seq;
667};
668
669#define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
670
671#ifdef CONFIG_AUDITSYSCALL
672static inline struct audit_buffer *xfrm_audit_start(const char *op)
673{
674 struct audit_buffer *audit_buf = NULL;
675
676 if (audit_enabled == AUDIT_OFF)
677 return NULL;
678 audit_buf = audit_log_start(audit_context(), GFP_ATOMIC,
679 AUDIT_MAC_IPSEC_EVENT);
680 if (audit_buf == NULL)
681 return NULL;
682 audit_log_format(audit_buf, "op=%s", op);
683 return audit_buf;
684}
685
686static inline void xfrm_audit_helper_usrinfo(bool task_valid,
687 struct audit_buffer *audit_buf)
688{
689 const unsigned int auid = from_kuid(&init_user_ns, task_valid ?
690 audit_get_loginuid(current) :
691 INVALID_UID);
692 const unsigned int ses = task_valid ? audit_get_sessionid(current) :
693 AUDIT_SID_UNSET;
694
695 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
696 audit_log_task_context(audit_buf);
697}
698
699void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid);
700void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
701 bool task_valid);
702void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid);
703void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid);
704void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
705 struct sk_buff *skb);
706void xfrm_audit_state_replay(struct xfrm_state *x, struct sk_buff *skb,
707 __be32 net_seq);
708void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
709void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, __be32 net_spi,
710 __be32 net_seq);
711void xfrm_audit_state_icvfail(struct xfrm_state *x, struct sk_buff *skb,
712 u8 proto);
713#else
714
715static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
716 bool task_valid)
717{
718}
719
720static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
721 bool task_valid)
722{
723}
724
725static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
726 bool task_valid)
727{
728}
729
730static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
731 bool task_valid)
732{
733}
734
735static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
736 struct sk_buff *skb)
737{
738}
739
740static inline void xfrm_audit_state_replay(struct xfrm_state *x,
741 struct sk_buff *skb, __be32 net_seq)
742{
743}
744
745static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
746 u16 family)
747{
748}
749
750static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
751 __be32 net_spi, __be32 net_seq)
752{
753}
754
755static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
756 struct sk_buff *skb, u8 proto)
757{
758}
759#endif /* CONFIG_AUDITSYSCALL */
760
761static inline void xfrm_pol_hold(struct xfrm_policy *policy)
762{
763 if (likely(policy != NULL))
764 refcount_inc(&policy->refcnt);
765}
766
767void xfrm_policy_destroy(struct xfrm_policy *policy);
768
769static inline void xfrm_pol_put(struct xfrm_policy *policy)
770{
771 if (refcount_dec_and_test(&policy->refcnt))
772 xfrm_policy_destroy(policy);
773}
774
775static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
776{
777 int i;
778 for (i = npols - 1; i >= 0; --i)
779 xfrm_pol_put(pols[i]);
780}
781
782void __xfrm_state_destroy(struct xfrm_state *, bool);
783
784static inline void __xfrm_state_put(struct xfrm_state *x)
785{
786 refcount_dec(&x->refcnt);
787}
788
789static inline void xfrm_state_put(struct xfrm_state *x)
790{
791 if (refcount_dec_and_test(&x->refcnt))
792 __xfrm_state_destroy(x, false);
793}
794
795static inline void xfrm_state_put_sync(struct xfrm_state *x)
796{
797 if (refcount_dec_and_test(&x->refcnt))
798 __xfrm_state_destroy(x, true);
799}
800
801static inline void xfrm_state_hold(struct xfrm_state *x)
802{
803 refcount_inc(&x->refcnt);
804}
805
806static inline bool addr_match(const void *token1, const void *token2,
807 unsigned int prefixlen)
808{
809 const __be32 *a1 = token1;
810 const __be32 *a2 = token2;
811 unsigned int pdw;
812 unsigned int pbi;
813
814 pdw = prefixlen >> 5; /* num of whole u32 in prefix */
815 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
816
817 if (pdw)
818 if (memcmp(a1, a2, pdw << 2))
819 return false;
820
821 if (pbi) {
822 __be32 mask;
823
824 mask = htonl((0xffffffff) << (32 - pbi));
825
826 if ((a1[pdw] ^ a2[pdw]) & mask)
827 return false;
828 }
829
830 return true;
831}
832
833static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen)
834{
835 /* C99 6.5.7 (3): u32 << 32 is undefined behaviour */
836 if (sizeof(long) == 4 && prefixlen == 0)
837 return true;
838 return !((a1 ^ a2) & htonl(~0UL << (32 - prefixlen)));
839}
840
841static __inline__
842__be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli)
843{
844 __be16 port;
845 switch(fl->flowi_proto) {
846 case IPPROTO_TCP:
847 case IPPROTO_UDP:
848 case IPPROTO_UDPLITE:
849 case IPPROTO_SCTP:
850 port = uli->ports.sport;
851 break;
852 case IPPROTO_ICMP:
853 case IPPROTO_ICMPV6:
854 port = htons(uli->icmpt.type);
855 break;
856 case IPPROTO_MH:
857 port = htons(uli->mht.type);
858 break;
859 case IPPROTO_GRE:
860 port = htons(ntohl(uli->gre_key) >> 16);
861 break;
862 default:
863 port = 0; /*XXX*/
864 }
865 return port;
866}
867
868static __inline__
869__be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli)
870{
871 __be16 port;
872 switch(fl->flowi_proto) {
873 case IPPROTO_TCP:
874 case IPPROTO_UDP:
875 case IPPROTO_UDPLITE:
876 case IPPROTO_SCTP:
877 port = uli->ports.dport;
878 break;
879 case IPPROTO_ICMP:
880 case IPPROTO_ICMPV6:
881 port = htons(uli->icmpt.code);
882 break;
883 case IPPROTO_GRE:
884 port = htons(ntohl(uli->gre_key) & 0xffff);
885 break;
886 default:
887 port = 0; /*XXX*/
888 }
889 return port;
890}
891
892bool xfrm_selector_match(const struct xfrm_selector *sel,
893 const struct flowi *fl, unsigned short family);
894
895#ifdef CONFIG_SECURITY_NETWORK_XFRM
896/* If neither has a context --> match
897 * Otherwise, both must have a context and the sids, doi, alg must match
898 */
899static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
900{
901 return ((!s1 && !s2) ||
902 (s1 && s2 &&
903 (s1->ctx_sid == s2->ctx_sid) &&
904 (s1->ctx_doi == s2->ctx_doi) &&
905 (s1->ctx_alg == s2->ctx_alg)));
906}
907#else
908static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
909{
910 return true;
911}
912#endif
913
914/* A struct encoding bundle of transformations to apply to some set of flow.
915 *
916 * xdst->child points to the next element of bundle.
917 * dst->xfrm points to an instanse of transformer.
918 *
919 * Due to unfortunate limitations of current routing cache, which we
920 * have no time to fix, it mirrors struct rtable and bound to the same
921 * routing key, including saddr,daddr. However, we can have many of
922 * bundles differing by session id. All the bundles grow from a parent
923 * policy rule.
924 */
925struct xfrm_dst {
926 union {
927 struct dst_entry dst;
928 struct rtable rt;
929 struct rt6_info rt6;
930 } u;
931 struct dst_entry *route;
932 struct dst_entry *child;
933 struct dst_entry *path;
934 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
935 int num_pols, num_xfrms;
936 u32 xfrm_genid;
937 u32 policy_genid;
938 u32 route_mtu_cached;
939 u32 child_mtu_cached;
940 u32 route_cookie;
941 u32 path_cookie;
942};
943
944static inline struct dst_entry *xfrm_dst_path(const struct dst_entry *dst)
945{
946#ifdef CONFIG_XFRM
947 if (dst->xfrm || (dst->flags & DST_XFRM_QUEUE)) {
948 const struct xfrm_dst *xdst = (const struct xfrm_dst *) dst;
949
950 return xdst->path;
951 }
952#endif
953 return (struct dst_entry *) dst;
954}
955
956static inline struct dst_entry *xfrm_dst_child(const struct dst_entry *dst)
957{
958#ifdef CONFIG_XFRM
959 if (dst->xfrm || (dst->flags & DST_XFRM_QUEUE)) {
960 struct xfrm_dst *xdst = (struct xfrm_dst *) dst;
961 return xdst->child;
962 }
963#endif
964 return NULL;
965}
966
967#ifdef CONFIG_XFRM
968static inline void xfrm_dst_set_child(struct xfrm_dst *xdst, struct dst_entry *child)
969{
970 xdst->child = child;
971}
972
973static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
974{
975 xfrm_pols_put(xdst->pols, xdst->num_pols);
976 dst_release(xdst->route);
977 if (likely(xdst->u.dst.xfrm))
978 xfrm_state_put(xdst->u.dst.xfrm);
979}
980#endif
981
982void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
983
984struct xfrm_if_parms {
985 int link; /* ifindex of underlying L2 interface */
986 u32 if_id; /* interface identifyer */
987};
988
989struct xfrm_if {
990 struct xfrm_if __rcu *next; /* next interface in list */
991 struct net_device *dev; /* virtual device associated with interface */
992 struct net *net; /* netns for packet i/o */
993 struct xfrm_if_parms p; /* interface parms */
994
995 struct gro_cells gro_cells;
996};
997
998struct xfrm_offload {
999 /* Output sequence number for replay protection on offloading. */
1000 struct {
1001 __u32 low;
1002 __u32 hi;
1003 } seq;
1004
1005 __u32 flags;
1006#define SA_DELETE_REQ 1
1007#define CRYPTO_DONE 2
1008#define CRYPTO_NEXT_DONE 4
1009#define CRYPTO_FALLBACK 8
1010#define XFRM_GSO_SEGMENT 16
1011#define XFRM_GRO 32
1012#define XFRM_ESP_NO_TRAILER 64
1013#define XFRM_DEV_RESUME 128
1014#define XFRM_XMIT 256
1015
1016 __u32 status;
1017#define CRYPTO_SUCCESS 1
1018#define CRYPTO_GENERIC_ERROR 2
1019#define CRYPTO_TRANSPORT_AH_AUTH_FAILED 4
1020#define CRYPTO_TRANSPORT_ESP_AUTH_FAILED 8
1021#define CRYPTO_TUNNEL_AH_AUTH_FAILED 16
1022#define CRYPTO_TUNNEL_ESP_AUTH_FAILED 32
1023#define CRYPTO_INVALID_PACKET_SYNTAX 64
1024#define CRYPTO_INVALID_PROTOCOL 128
1025
1026 __u8 proto;
1027};
1028
1029struct sec_path {
1030 int len;
1031 int olen;
1032
1033 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
1034 struct xfrm_offload ovec[XFRM_MAX_OFFLOAD_DEPTH];
1035};
1036
1037struct sec_path *secpath_set(struct sk_buff *skb);
1038
1039static inline void
1040secpath_reset(struct sk_buff *skb)
1041{
1042#ifdef CONFIG_XFRM
1043 skb_ext_del(skb, SKB_EXT_SEC_PATH);
1044#endif
1045}
1046
1047static inline int
1048xfrm_addr_any(const xfrm_address_t *addr, unsigned short family)
1049{
1050 switch (family) {
1051 case AF_INET:
1052 return addr->a4 == 0;
1053 case AF_INET6:
1054 return ipv6_addr_any(&addr->in6);
1055 }
1056 return 0;
1057}
1058
1059static inline int
1060__xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1061{
1062 return (tmpl->saddr.a4 &&
1063 tmpl->saddr.a4 != x->props.saddr.a4);
1064}
1065
1066static inline int
1067__xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1068{
1069 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
1070 !ipv6_addr_equal((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
1071}
1072
1073static inline int
1074xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family)
1075{
1076 switch (family) {
1077 case AF_INET:
1078 return __xfrm4_state_addr_cmp(tmpl, x);
1079 case AF_INET6:
1080 return __xfrm6_state_addr_cmp(tmpl, x);
1081 }
1082 return !0;
1083}
1084
1085#ifdef CONFIG_XFRM
1086int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb,
1087 unsigned short family);
1088
1089static inline int __xfrm_policy_check2(struct sock *sk, int dir,
1090 struct sk_buff *skb,
1091 unsigned int family, int reverse)
1092{
1093 struct net *net = dev_net(skb->dev);
1094 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
1095
1096 if (sk && sk->sk_policy[XFRM_POLICY_IN])
1097 return __xfrm_policy_check(sk, ndir, skb, family);
1098
1099 return (!net->xfrm.policy_count[dir] && !secpath_exists(skb)) ||
1100 (skb_dst(skb)->flags & DST_NOPOLICY) ||
1101 __xfrm_policy_check(sk, ndir, skb, family);
1102}
1103
1104static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1105{
1106 return __xfrm_policy_check2(sk, dir, skb, family, 0);
1107}
1108
1109static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1110{
1111 return xfrm_policy_check(sk, dir, skb, AF_INET);
1112}
1113
1114static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1115{
1116 return xfrm_policy_check(sk, dir, skb, AF_INET6);
1117}
1118
1119static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1120 struct sk_buff *skb)
1121{
1122 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1123}
1124
1125static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1126 struct sk_buff *skb)
1127{
1128 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1129}
1130
1131int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1132 unsigned int family, int reverse);
1133
1134static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1135 unsigned int family)
1136{
1137 return __xfrm_decode_session(skb, fl, family, 0);
1138}
1139
1140static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1141 struct flowi *fl,
1142 unsigned int family)
1143{
1144 return __xfrm_decode_session(skb, fl, family, 1);
1145}
1146
1147int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1148
1149static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1150{
1151 struct net *net = dev_net(skb->dev);
1152
1153 return !net->xfrm.policy_count[XFRM_POLICY_OUT] ||
1154 (skb_dst(skb)->flags & DST_NOXFRM) ||
1155 __xfrm_route_forward(skb, family);
1156}
1157
1158static inline int xfrm4_route_forward(struct sk_buff *skb)
1159{
1160 return xfrm_route_forward(skb, AF_INET);
1161}
1162
1163static inline int xfrm6_route_forward(struct sk_buff *skb)
1164{
1165 return xfrm_route_forward(skb, AF_INET6);
1166}
1167
1168int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk);
1169
1170static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk)
1171{
1172 sk->sk_policy[0] = NULL;
1173 sk->sk_policy[1] = NULL;
1174 if (unlikely(osk->sk_policy[0] || osk->sk_policy[1]))
1175 return __xfrm_sk_clone_policy(sk, osk);
1176 return 0;
1177}
1178
1179int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1180
1181static inline void xfrm_sk_free_policy(struct sock *sk)
1182{
1183 struct xfrm_policy *pol;
1184
1185 pol = rcu_dereference_protected(sk->sk_policy[0], 1);
1186 if (unlikely(pol != NULL)) {
1187 xfrm_policy_delete(pol, XFRM_POLICY_MAX);
1188 sk->sk_policy[0] = NULL;
1189 }
1190 pol = rcu_dereference_protected(sk->sk_policy[1], 1);
1191 if (unlikely(pol != NULL)) {
1192 xfrm_policy_delete(pol, XFRM_POLICY_MAX+1);
1193 sk->sk_policy[1] = NULL;
1194 }
1195}
1196
1197#else
1198
1199static inline void xfrm_sk_free_policy(struct sock *sk) {}
1200static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) { return 0; }
1201static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1202static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1203static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1204{
1205 return 1;
1206}
1207static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1208{
1209 return 1;
1210}
1211static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1212{
1213 return 1;
1214}
1215static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1216 struct flowi *fl,
1217 unsigned int family)
1218{
1219 return -ENOSYS;
1220}
1221static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1222 struct sk_buff *skb)
1223{
1224 return 1;
1225}
1226static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1227 struct sk_buff *skb)
1228{
1229 return 1;
1230}
1231#endif
1232
1233static __inline__
1234xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family)
1235{
1236 switch (family){
1237 case AF_INET:
1238 return (xfrm_address_t *)&fl->u.ip4.daddr;
1239 case AF_INET6:
1240 return (xfrm_address_t *)&fl->u.ip6.daddr;
1241 }
1242 return NULL;
1243}
1244
1245static __inline__
1246xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family)
1247{
1248 switch (family){
1249 case AF_INET:
1250 return (xfrm_address_t *)&fl->u.ip4.saddr;
1251 case AF_INET6:
1252 return (xfrm_address_t *)&fl->u.ip6.saddr;
1253 }
1254 return NULL;
1255}
1256
1257static __inline__
1258void xfrm_flowi_addr_get(const struct flowi *fl,
1259 xfrm_address_t *saddr, xfrm_address_t *daddr,
1260 unsigned short family)
1261{
1262 switch(family) {
1263 case AF_INET:
1264 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4));
1265 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4));
1266 break;
1267 case AF_INET6:
1268 saddr->in6 = fl->u.ip6.saddr;
1269 daddr->in6 = fl->u.ip6.daddr;
1270 break;
1271 }
1272}
1273
1274static __inline__ int
1275__xfrm4_state_addr_check(const struct xfrm_state *x,
1276 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1277{
1278 if (daddr->a4 == x->id.daddr.a4 &&
1279 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1280 return 1;
1281 return 0;
1282}
1283
1284static __inline__ int
1285__xfrm6_state_addr_check(const struct xfrm_state *x,
1286 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1287{
1288 if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1289 (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) ||
1290 ipv6_addr_any((struct in6_addr *)saddr) ||
1291 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1292 return 1;
1293 return 0;
1294}
1295
1296static __inline__ int
1297xfrm_state_addr_check(const struct xfrm_state *x,
1298 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1299 unsigned short family)
1300{
1301 switch (family) {
1302 case AF_INET:
1303 return __xfrm4_state_addr_check(x, daddr, saddr);
1304 case AF_INET6:
1305 return __xfrm6_state_addr_check(x, daddr, saddr);
1306 }
1307 return 0;
1308}
1309
1310static __inline__ int
1311xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl,
1312 unsigned short family)
1313{
1314 switch (family) {
1315 case AF_INET:
1316 return __xfrm4_state_addr_check(x,
1317 (const xfrm_address_t *)&fl->u.ip4.daddr,
1318 (const xfrm_address_t *)&fl->u.ip4.saddr);
1319 case AF_INET6:
1320 return __xfrm6_state_addr_check(x,
1321 (const xfrm_address_t *)&fl->u.ip6.daddr,
1322 (const xfrm_address_t *)&fl->u.ip6.saddr);
1323 }
1324 return 0;
1325}
1326
1327static inline int xfrm_state_kern(const struct xfrm_state *x)
1328{
1329 return atomic_read(&x->tunnel_users);
1330}
1331
1332static inline bool xfrm_id_proto_valid(u8 proto)
1333{
1334 switch (proto) {
1335 case IPPROTO_AH:
1336 case IPPROTO_ESP:
1337 case IPPROTO_COMP:
1338#if IS_ENABLED(CONFIG_IPV6)
1339 case IPPROTO_ROUTING:
1340 case IPPROTO_DSTOPTS:
1341#endif
1342 return true;
1343 default:
1344 return false;
1345 }
1346}
1347
1348/* IPSEC_PROTO_ANY only matches 3 IPsec protocols, 0 could match all. */
1349static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1350{
1351 return (!userproto || proto == userproto ||
1352 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1353 proto == IPPROTO_ESP ||
1354 proto == IPPROTO_COMP)));
1355}
1356
1357/*
1358 * xfrm algorithm information
1359 */
1360struct xfrm_algo_aead_info {
1361 char *geniv;
1362 u16 icv_truncbits;
1363};
1364
1365struct xfrm_algo_auth_info {
1366 u16 icv_truncbits;
1367 u16 icv_fullbits;
1368};
1369
1370struct xfrm_algo_encr_info {
1371 char *geniv;
1372 u16 blockbits;
1373 u16 defkeybits;
1374};
1375
1376struct xfrm_algo_comp_info {
1377 u16 threshold;
1378};
1379
1380struct xfrm_algo_desc {
1381 char *name;
1382 char *compat;
1383 u8 available:1;
1384 u8 pfkey_supported:1;
1385 union {
1386 struct xfrm_algo_aead_info aead;
1387 struct xfrm_algo_auth_info auth;
1388 struct xfrm_algo_encr_info encr;
1389 struct xfrm_algo_comp_info comp;
1390 } uinfo;
1391 struct sadb_alg desc;
1392};
1393
1394/* XFRM protocol handlers. */
1395struct xfrm4_protocol {
1396 int (*handler)(struct sk_buff *skb);
1397 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1398 int encap_type);
1399 int (*cb_handler)(struct sk_buff *skb, int err);
1400 int (*err_handler)(struct sk_buff *skb, u32 info);
1401
1402 struct xfrm4_protocol __rcu *next;
1403 int priority;
1404};
1405
1406struct xfrm6_protocol {
1407 int (*handler)(struct sk_buff *skb);
1408 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1409 int encap_type);
1410 int (*cb_handler)(struct sk_buff *skb, int err);
1411 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1412 u8 type, u8 code, int offset, __be32 info);
1413
1414 struct xfrm6_protocol __rcu *next;
1415 int priority;
1416};
1417
1418/* XFRM tunnel handlers. */
1419struct xfrm_tunnel {
1420 int (*handler)(struct sk_buff *skb);
1421 int (*cb_handler)(struct sk_buff *skb, int err);
1422 int (*err_handler)(struct sk_buff *skb, u32 info);
1423
1424 struct xfrm_tunnel __rcu *next;
1425 int priority;
1426};
1427
1428struct xfrm6_tunnel {
1429 int (*handler)(struct sk_buff *skb);
1430 int (*cb_handler)(struct sk_buff *skb, int err);
1431 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1432 u8 type, u8 code, int offset, __be32 info);
1433 struct xfrm6_tunnel __rcu *next;
1434 int priority;
1435};
1436
1437void xfrm_init(void);
1438void xfrm4_init(void);
1439int xfrm_state_init(struct net *net);
1440void xfrm_state_fini(struct net *net);
1441void xfrm4_state_init(void);
1442void xfrm4_protocol_init(void);
1443#ifdef CONFIG_XFRM
1444int xfrm6_init(void);
1445void xfrm6_fini(void);
1446int xfrm6_state_init(void);
1447void xfrm6_state_fini(void);
1448int xfrm6_protocol_init(void);
1449void xfrm6_protocol_fini(void);
1450#else
1451static inline int xfrm6_init(void)
1452{
1453 return 0;
1454}
1455static inline void xfrm6_fini(void)
1456{
1457 ;
1458}
1459#endif
1460
1461#ifdef CONFIG_XFRM_STATISTICS
1462int xfrm_proc_init(struct net *net);
1463void xfrm_proc_fini(struct net *net);
1464#endif
1465
1466int xfrm_sysctl_init(struct net *net);
1467#ifdef CONFIG_SYSCTL
1468void xfrm_sysctl_fini(struct net *net);
1469#else
1470static inline void xfrm_sysctl_fini(struct net *net)
1471{
1472}
1473#endif
1474
1475void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
1476 struct xfrm_address_filter *filter);
1477int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1478 int (*func)(struct xfrm_state *, int, void*), void *);
1479void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net);
1480struct xfrm_state *xfrm_state_alloc(struct net *net);
1481void xfrm_state_free(struct xfrm_state *x);
1482struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr,
1483 const xfrm_address_t *saddr,
1484 const struct flowi *fl,
1485 struct xfrm_tmpl *tmpl,
1486 struct xfrm_policy *pol, int *err,
1487 unsigned short family, u32 if_id);
1488struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark, u32 if_id,
1489 xfrm_address_t *daddr,
1490 xfrm_address_t *saddr,
1491 unsigned short family,
1492 u8 mode, u8 proto, u32 reqid);
1493struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
1494 unsigned short family);
1495int xfrm_state_check_expire(struct xfrm_state *x);
1496void xfrm_state_insert(struct xfrm_state *x);
1497int xfrm_state_add(struct xfrm_state *x);
1498int xfrm_state_update(struct xfrm_state *x);
1499struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1500 const xfrm_address_t *daddr, __be32 spi,
1501 u8 proto, unsigned short family);
1502struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1503 const xfrm_address_t *daddr,
1504 const xfrm_address_t *saddr,
1505 u8 proto,
1506 unsigned short family);
1507#ifdef CONFIG_XFRM_SUB_POLICY
1508void xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1509 unsigned short family);
1510void xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1511 unsigned short family);
1512#else
1513static inline void xfrm_tmpl_sort(struct xfrm_tmpl **d, struct xfrm_tmpl **s,
1514 int n, unsigned short family)
1515{
1516}
1517
1518static inline void xfrm_state_sort(struct xfrm_state **d, struct xfrm_state **s,
1519 int n, unsigned short family)
1520{
1521}
1522#endif
1523
1524struct xfrmk_sadinfo {
1525 u32 sadhcnt; /* current hash bkts */
1526 u32 sadhmcnt; /* max allowed hash bkts */
1527 u32 sadcnt; /* current running count */
1528};
1529
1530struct xfrmk_spdinfo {
1531 u32 incnt;
1532 u32 outcnt;
1533 u32 fwdcnt;
1534 u32 inscnt;
1535 u32 outscnt;
1536 u32 fwdscnt;
1537 u32 spdhcnt;
1538 u32 spdhmcnt;
1539};
1540
1541struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1542int xfrm_state_delete(struct xfrm_state *x);
1543int xfrm_state_flush(struct net *net, u8 proto, bool task_valid, bool sync);
1544int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid);
1545void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1546void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1547u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq);
1548int xfrm_init_replay(struct xfrm_state *x);
1549u32 xfrm_state_mtu(struct xfrm_state *x, int mtu);
1550int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload);
1551int xfrm_init_state(struct xfrm_state *x);
1552int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type);
1553int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1554int xfrm_trans_queue_net(struct net *net, struct sk_buff *skb,
1555 int (*finish)(struct net *, struct sock *,
1556 struct sk_buff *));
1557int xfrm_trans_queue(struct sk_buff *skb,
1558 int (*finish)(struct net *, struct sock *,
1559 struct sk_buff *));
1560int xfrm_output_resume(struct sk_buff *skb, int err);
1561int xfrm_output(struct sock *sk, struct sk_buff *skb);
1562
1563#if IS_ENABLED(CONFIG_NET_PKTGEN)
1564int pktgen_xfrm_outer_mode_output(struct xfrm_state *x, struct sk_buff *skb);
1565#endif
1566
1567void xfrm_local_error(struct sk_buff *skb, int mtu);
1568int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1569int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1570 int encap_type);
1571int xfrm4_transport_finish(struct sk_buff *skb, int async);
1572int xfrm4_rcv(struct sk_buff *skb);
1573int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1574
1575static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1576{
1577 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
1578 XFRM_SPI_SKB_CB(skb)->family = AF_INET;
1579 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
1580 return xfrm_input(skb, nexthdr, spi, 0);
1581}
1582
1583int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1584int xfrm4_output_finish(struct sock *sk, struct sk_buff *skb);
1585int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol);
1586int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol);
1587int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1588int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1589void xfrm4_local_error(struct sk_buff *skb, u32 mtu);
1590int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1591int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi,
1592 struct ip6_tnl *t);
1593int xfrm6_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1594 int encap_type);
1595int xfrm6_transport_finish(struct sk_buff *skb, int async);
1596int xfrm6_rcv_tnl(struct sk_buff *skb, struct ip6_tnl *t);
1597int xfrm6_rcv(struct sk_buff *skb);
1598int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1599 xfrm_address_t *saddr, u8 proto);
1600void xfrm6_local_error(struct sk_buff *skb, u32 mtu);
1601int xfrm6_protocol_register(struct xfrm6_protocol *handler, unsigned char protocol);
1602int xfrm6_protocol_deregister(struct xfrm6_protocol *handler, unsigned char protocol);
1603int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1604int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1605__be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1606__be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr);
1607int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1608int xfrm6_output_finish(struct sock *sk, struct sk_buff *skb);
1609int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1610 u8 **prevhdr);
1611
1612#ifdef CONFIG_XFRM
1613void xfrm6_local_rxpmtu(struct sk_buff *skb, u32 mtu);
1614int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1615int xfrm6_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1616int xfrm_user_policy(struct sock *sk, int optname, sockptr_t optval,
1617 int optlen);
1618#else
1619static inline int xfrm_user_policy(struct sock *sk, int optname,
1620 sockptr_t optval, int optlen)
1621{
1622 return -ENOPROTOOPT;
1623}
1624#endif
1625
1626struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, int oif,
1627 const xfrm_address_t *saddr,
1628 const xfrm_address_t *daddr,
1629 int family, u32 mark);
1630
1631struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1632
1633void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1634int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1635 int (*func)(struct xfrm_policy *, int, int, void*),
1636 void *);
1637void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net);
1638int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1639struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net,
1640 const struct xfrm_mark *mark,
1641 u32 if_id, u8 type, int dir,
1642 struct xfrm_selector *sel,
1643 struct xfrm_sec_ctx *ctx, int delete,
1644 int *err);
1645struct xfrm_policy *xfrm_policy_byid(struct net *net,
1646 const struct xfrm_mark *mark, u32 if_id,
1647 u8 type, int dir, u32 id, int delete,
1648 int *err);
1649int xfrm_policy_flush(struct net *net, u8 type, bool task_valid);
1650void xfrm_policy_hash_rebuild(struct net *net);
1651u32 xfrm_get_acqseq(void);
1652int verify_spi_info(u8 proto, u32 min, u32 max);
1653int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1654struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark,
1655 u8 mode, u32 reqid, u32 if_id, u8 proto,
1656 const xfrm_address_t *daddr,
1657 const xfrm_address_t *saddr, int create,
1658 unsigned short family);
1659int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1660
1661#ifdef CONFIG_XFRM_MIGRATE
1662int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1663 const struct xfrm_migrate *m, int num_bundles,
1664 const struct xfrm_kmaddress *k,
1665 const struct xfrm_encap_tmpl *encap);
1666struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net);
1667struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1668 struct xfrm_migrate *m,
1669 struct xfrm_encap_tmpl *encap);
1670int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1671 struct xfrm_migrate *m, int num_bundles,
1672 struct xfrm_kmaddress *k, struct net *net,
1673 struct xfrm_encap_tmpl *encap);
1674#endif
1675
1676int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1677void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid);
1678int km_report(struct net *net, u8 proto, struct xfrm_selector *sel,
1679 xfrm_address_t *addr);
1680
1681void xfrm_input_init(void);
1682int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1683
1684void xfrm_probe_algs(void);
1685int xfrm_count_pfkey_auth_supported(void);
1686int xfrm_count_pfkey_enc_supported(void);
1687struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1688struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1689struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1690struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1691struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1692struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe);
1693struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe);
1694struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe);
1695struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len,
1696 int probe);
1697
1698static inline bool xfrm6_addr_equal(const xfrm_address_t *a,
1699 const xfrm_address_t *b)
1700{
1701 return ipv6_addr_equal((const struct in6_addr *)a,
1702 (const struct in6_addr *)b);
1703}
1704
1705static inline bool xfrm_addr_equal(const xfrm_address_t *a,
1706 const xfrm_address_t *b,
1707 sa_family_t family)
1708{
1709 switch (family) {
1710 default:
1711 case AF_INET:
1712 return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0;
1713 case AF_INET6:
1714 return xfrm6_addr_equal(a, b);
1715 }
1716}
1717
1718static inline int xfrm_policy_id2dir(u32 index)
1719{
1720 return index & 7;
1721}
1722
1723#ifdef CONFIG_XFRM
1724static inline int xfrm_aevent_is_on(struct net *net)
1725{
1726 struct sock *nlsk;
1727 int ret = 0;
1728
1729 rcu_read_lock();
1730 nlsk = rcu_dereference(net->xfrm.nlsk);
1731 if (nlsk)
1732 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1733 rcu_read_unlock();
1734 return ret;
1735}
1736
1737static inline int xfrm_acquire_is_on(struct net *net)
1738{
1739 struct sock *nlsk;
1740 int ret = 0;
1741
1742 rcu_read_lock();
1743 nlsk = rcu_dereference(net->xfrm.nlsk);
1744 if (nlsk)
1745 ret = netlink_has_listeners(nlsk, XFRMNLGRP_ACQUIRE);
1746 rcu_read_unlock();
1747
1748 return ret;
1749}
1750#endif
1751
1752static inline unsigned int aead_len(struct xfrm_algo_aead *alg)
1753{
1754 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1755}
1756
1757static inline unsigned int xfrm_alg_len(const struct xfrm_algo *alg)
1758{
1759 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1760}
1761
1762static inline unsigned int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg)
1763{
1764 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1765}
1766
1767static inline unsigned int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn)
1768{
1769 return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32);
1770}
1771
1772#ifdef CONFIG_XFRM_MIGRATE
1773static inline int xfrm_replay_clone(struct xfrm_state *x,
1774 struct xfrm_state *orig)
1775{
1776
1777 x->replay_esn = kmemdup(orig->replay_esn,
1778 xfrm_replay_state_esn_len(orig->replay_esn),
1779 GFP_KERNEL);
1780 if (!x->replay_esn)
1781 return -ENOMEM;
1782 x->preplay_esn = kmemdup(orig->preplay_esn,
1783 xfrm_replay_state_esn_len(orig->preplay_esn),
1784 GFP_KERNEL);
1785 if (!x->preplay_esn)
1786 return -ENOMEM;
1787
1788 return 0;
1789}
1790
1791static inline struct xfrm_algo_aead *xfrm_algo_aead_clone(struct xfrm_algo_aead *orig)
1792{
1793 return kmemdup(orig, aead_len(orig), GFP_KERNEL);
1794}
1795
1796
1797static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1798{
1799 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1800}
1801
1802static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1803{
1804 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1805}
1806
1807static inline void xfrm_states_put(struct xfrm_state **states, int n)
1808{
1809 int i;
1810 for (i = 0; i < n; i++)
1811 xfrm_state_put(*(states + i));
1812}
1813
1814static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1815{
1816 int i;
1817 for (i = 0; i < n; i++)
1818 xfrm_state_delete(*(states + i));
1819}
1820#endif
1821
1822#ifdef CONFIG_XFRM
1823static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1824{
1825 struct sec_path *sp = skb_sec_path(skb);
1826
1827 return sp->xvec[sp->len - 1];
1828}
1829#endif
1830
1831static inline struct xfrm_offload *xfrm_offload(struct sk_buff *skb)
1832{
1833#ifdef CONFIG_XFRM
1834 struct sec_path *sp = skb_sec_path(skb);
1835
1836 if (!sp || !sp->olen || sp->len != sp->olen)
1837 return NULL;
1838
1839 return &sp->ovec[sp->olen - 1];
1840#else
1841 return NULL;
1842#endif
1843}
1844
1845void __init xfrm_dev_init(void);
1846
1847#ifdef CONFIG_XFRM_OFFLOAD
1848void xfrm_dev_resume(struct sk_buff *skb);
1849void xfrm_dev_backlog(struct softnet_data *sd);
1850struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again);
1851int xfrm_dev_state_add(struct net *net, struct xfrm_state *x,
1852 struct xfrm_user_offload *xuo);
1853bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x);
1854
1855static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
1856{
1857 struct xfrm_state_offload *xso = &x->xso;
1858
1859 if (xso->dev && xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn)
1860 xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn(x);
1861}
1862
1863static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
1864{
1865 struct xfrm_state *x = dst->xfrm;
1866 struct xfrm_dst *xdst;
1867
1868 if (!x || !x->type_offload)
1869 return false;
1870
1871 xdst = (struct xfrm_dst *) dst;
1872 if (!x->xso.offload_handle && !xdst->child->xfrm)
1873 return true;
1874 if (x->xso.offload_handle && (x->xso.dev == xfrm_dst_path(dst)->dev) &&
1875 !xdst->child->xfrm)
1876 return true;
1877
1878 return false;
1879}
1880
1881static inline void xfrm_dev_state_delete(struct xfrm_state *x)
1882{
1883 struct xfrm_state_offload *xso = &x->xso;
1884
1885 if (xso->dev)
1886 xso->dev->xfrmdev_ops->xdo_dev_state_delete(x);
1887}
1888
1889static inline void xfrm_dev_state_free(struct xfrm_state *x)
1890{
1891 struct xfrm_state_offload *xso = &x->xso;
1892 struct net_device *dev = xso->dev;
1893
1894 if (dev && dev->xfrmdev_ops) {
1895 if (dev->xfrmdev_ops->xdo_dev_state_free)
1896 dev->xfrmdev_ops->xdo_dev_state_free(x);
1897 xso->dev = NULL;
1898 dev_put(dev);
1899 }
1900}
1901#else
1902static inline void xfrm_dev_resume(struct sk_buff *skb)
1903{
1904}
1905
1906static inline void xfrm_dev_backlog(struct softnet_data *sd)
1907{
1908}
1909
1910static inline struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again)
1911{
1912 return skb;
1913}
1914
1915static inline int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, struct xfrm_user_offload *xuo)
1916{
1917 return 0;
1918}
1919
1920static inline void xfrm_dev_state_delete(struct xfrm_state *x)
1921{
1922}
1923
1924static inline void xfrm_dev_state_free(struct xfrm_state *x)
1925{
1926}
1927
1928static inline bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x)
1929{
1930 return false;
1931}
1932
1933static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
1934{
1935}
1936
1937static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
1938{
1939 return false;
1940}
1941#endif
1942
1943static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
1944{
1945 if (attrs[XFRMA_MARK])
1946 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark));
1947 else
1948 m->v = m->m = 0;
1949
1950 return m->v & m->m;
1951}
1952
1953static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m)
1954{
1955 int ret = 0;
1956
1957 if (m->m | m->v)
1958 ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
1959 return ret;
1960}
1961
1962static inline __u32 xfrm_smark_get(__u32 mark, struct xfrm_state *x)
1963{
1964 struct xfrm_mark *m = &x->props.smark;
1965
1966 return (m->v & m->m) | (mark & ~m->m);
1967}
1968
1969static inline int xfrm_if_id_put(struct sk_buff *skb, __u32 if_id)
1970{
1971 int ret = 0;
1972
1973 if (if_id)
1974 ret = nla_put_u32(skb, XFRMA_IF_ID, if_id);
1975 return ret;
1976}
1977
1978static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x,
1979 unsigned int family)
1980{
1981 bool tunnel = false;
1982
1983 switch(family) {
1984 case AF_INET:
1985 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4)
1986 tunnel = true;
1987 break;
1988 case AF_INET6:
1989 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6)
1990 tunnel = true;
1991 break;
1992 }
1993 if (tunnel && !(x->outer_mode.flags & XFRM_MODE_FLAG_TUNNEL))
1994 return -EINVAL;
1995
1996 return 0;
1997}
1998
1999#if IS_ENABLED(CONFIG_IPV6)
2000static inline bool xfrm6_local_dontfrag(const struct sock *sk)
2001{
2002 int proto;
2003
2004 if (!sk || sk->sk_family != AF_INET6)
2005 return false;
2006
2007 proto = sk->sk_protocol;
2008 if (proto == IPPROTO_UDP || proto == IPPROTO_RAW)
2009 return inet6_sk(sk)->dontfrag;
2010
2011 return false;
2012}
2013#endif
2014#endif /* _NET_XFRM_H */