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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 bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen)
831{
832 /* C99 6.5.7 (3): u32 << 32 is undefined behaviour */
833 if (prefixlen == 0)
834 return true;
835 return !((a1 ^ a2) & htonl(0xFFFFFFFFu << (32 - prefixlen)));
836}
837
838static __inline__
839__be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli)
840{
841 __be16 port;
842 switch(fl->flowi_proto) {
843 case IPPROTO_TCP:
844 case IPPROTO_UDP:
845 case IPPROTO_UDPLITE:
846 case IPPROTO_SCTP:
847 port = uli->ports.sport;
848 break;
849 case IPPROTO_ICMP:
850 case IPPROTO_ICMPV6:
851 port = htons(uli->icmpt.type);
852 break;
853 case IPPROTO_MH:
854 port = htons(uli->mht.type);
855 break;
856 case IPPROTO_GRE:
857 port = htons(ntohl(uli->gre_key) >> 16);
858 break;
859 default:
860 port = 0; /*XXX*/
861 }
862 return port;
863}
864
865static __inline__
866__be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli)
867{
868 __be16 port;
869 switch(fl->flowi_proto) {
870 case IPPROTO_TCP:
871 case IPPROTO_UDP:
872 case IPPROTO_UDPLITE:
873 case IPPROTO_SCTP:
874 port = uli->ports.dport;
875 break;
876 case IPPROTO_ICMP:
877 case IPPROTO_ICMPV6:
878 port = htons(uli->icmpt.code);
879 break;
880 case IPPROTO_GRE:
881 port = htons(ntohl(uli->gre_key) & 0xffff);
882 break;
883 default:
884 port = 0; /*XXX*/
885 }
886 return port;
887}
888
889extern bool xfrm_selector_match(const struct xfrm_selector *sel,
890 const struct flowi *fl,
891 unsigned short family);
892
893#ifdef CONFIG_SECURITY_NETWORK_XFRM
894/* If neither has a context --> match
895 * Otherwise, both must have a context and the sids, doi, alg must match
896 */
897static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
898{
899 return ((!s1 && !s2) ||
900 (s1 && s2 &&
901 (s1->ctx_sid == s2->ctx_sid) &&
902 (s1->ctx_doi == s2->ctx_doi) &&
903 (s1->ctx_alg == s2->ctx_alg)));
904}
905#else
906static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
907{
908 return true;
909}
910#endif
911
912/* A struct encoding bundle of transformations to apply to some set of flow.
913 *
914 * dst->child points to the next element of bundle.
915 * dst->xfrm points to an instanse of transformer.
916 *
917 * Due to unfortunate limitations of current routing cache, which we
918 * have no time to fix, it mirrors struct rtable and bound to the same
919 * routing key, including saddr,daddr. However, we can have many of
920 * bundles differing by session id. All the bundles grow from a parent
921 * policy rule.
922 */
923struct xfrm_dst {
924 union {
925 struct dst_entry dst;
926 struct rtable rt;
927 struct rt6_info rt6;
928 } u;
929 struct dst_entry *route;
930 struct flow_cache_object flo;
931 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
932 int num_pols, num_xfrms;
933#ifdef CONFIG_XFRM_SUB_POLICY
934 struct flowi *origin;
935 struct xfrm_selector *partner;
936#endif
937 u32 xfrm_genid;
938 u32 policy_genid;
939 u32 route_mtu_cached;
940 u32 child_mtu_cached;
941 u32 route_cookie;
942 u32 path_cookie;
943};
944
945#ifdef CONFIG_XFRM
946static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
947{
948 xfrm_pols_put(xdst->pols, xdst->num_pols);
949 dst_release(xdst->route);
950 if (likely(xdst->u.dst.xfrm))
951 xfrm_state_put(xdst->u.dst.xfrm);
952#ifdef CONFIG_XFRM_SUB_POLICY
953 kfree(xdst->origin);
954 xdst->origin = NULL;
955 kfree(xdst->partner);
956 xdst->partner = NULL;
957#endif
958}
959#endif
960
961extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
962
963struct sec_path {
964 atomic_t refcnt;
965 int len;
966 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
967};
968
969static inline int secpath_exists(struct sk_buff *skb)
970{
971#ifdef CONFIG_XFRM
972 return skb->sp != NULL;
973#else
974 return 0;
975#endif
976}
977
978static inline struct sec_path *
979secpath_get(struct sec_path *sp)
980{
981 if (sp)
982 atomic_inc(&sp->refcnt);
983 return sp;
984}
985
986extern void __secpath_destroy(struct sec_path *sp);
987
988static inline void
989secpath_put(struct sec_path *sp)
990{
991 if (sp && atomic_dec_and_test(&sp->refcnt))
992 __secpath_destroy(sp);
993}
994
995extern struct sec_path *secpath_dup(struct sec_path *src);
996
997static inline void
998secpath_reset(struct sk_buff *skb)
999{
1000#ifdef CONFIG_XFRM
1001 secpath_put(skb->sp);
1002 skb->sp = NULL;
1003#endif
1004}
1005
1006static inline int
1007xfrm_addr_any(const xfrm_address_t *addr, unsigned short family)
1008{
1009 switch (family) {
1010 case AF_INET:
1011 return addr->a4 == 0;
1012 case AF_INET6:
1013 return ipv6_addr_any((struct in6_addr *)&addr->a6);
1014 }
1015 return 0;
1016}
1017
1018static inline int
1019__xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1020{
1021 return (tmpl->saddr.a4 &&
1022 tmpl->saddr.a4 != x->props.saddr.a4);
1023}
1024
1025static inline int
1026__xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1027{
1028 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
1029 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
1030}
1031
1032static inline int
1033xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family)
1034{
1035 switch (family) {
1036 case AF_INET:
1037 return __xfrm4_state_addr_cmp(tmpl, x);
1038 case AF_INET6:
1039 return __xfrm6_state_addr_cmp(tmpl, x);
1040 }
1041 return !0;
1042}
1043
1044#ifdef CONFIG_XFRM
1045extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
1046
1047static inline int __xfrm_policy_check2(struct sock *sk, int dir,
1048 struct sk_buff *skb,
1049 unsigned int family, int reverse)
1050{
1051 struct net *net = dev_net(skb->dev);
1052 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
1053
1054 if (sk && sk->sk_policy[XFRM_POLICY_IN])
1055 return __xfrm_policy_check(sk, ndir, skb, family);
1056
1057 return (!net->xfrm.policy_count[dir] && !skb->sp) ||
1058 (skb_dst(skb)->flags & DST_NOPOLICY) ||
1059 __xfrm_policy_check(sk, ndir, skb, family);
1060}
1061
1062static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1063{
1064 return __xfrm_policy_check2(sk, dir, skb, family, 0);
1065}
1066
1067static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1068{
1069 return xfrm_policy_check(sk, dir, skb, AF_INET);
1070}
1071
1072static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1073{
1074 return xfrm_policy_check(sk, dir, skb, AF_INET6);
1075}
1076
1077static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1078 struct sk_buff *skb)
1079{
1080 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1081}
1082
1083static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1084 struct sk_buff *skb)
1085{
1086 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1087}
1088
1089extern int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1090 unsigned int family, int reverse);
1091
1092static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1093 unsigned int family)
1094{
1095 return __xfrm_decode_session(skb, fl, family, 0);
1096}
1097
1098static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1099 struct flowi *fl,
1100 unsigned int family)
1101{
1102 return __xfrm_decode_session(skb, fl, family, 1);
1103}
1104
1105extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1106
1107static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1108{
1109 struct net *net = dev_net(skb->dev);
1110
1111 return !net->xfrm.policy_count[XFRM_POLICY_OUT] ||
1112 (skb_dst(skb)->flags & DST_NOXFRM) ||
1113 __xfrm_route_forward(skb, family);
1114}
1115
1116static inline int xfrm4_route_forward(struct sk_buff *skb)
1117{
1118 return xfrm_route_forward(skb, AF_INET);
1119}
1120
1121static inline int xfrm6_route_forward(struct sk_buff *skb)
1122{
1123 return xfrm_route_forward(skb, AF_INET6);
1124}
1125
1126extern int __xfrm_sk_clone_policy(struct sock *sk);
1127
1128static inline int xfrm_sk_clone_policy(struct sock *sk)
1129{
1130 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
1131 return __xfrm_sk_clone_policy(sk);
1132 return 0;
1133}
1134
1135extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1136
1137static inline void xfrm_sk_free_policy(struct sock *sk)
1138{
1139 if (unlikely(sk->sk_policy[0] != NULL)) {
1140 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
1141 sk->sk_policy[0] = NULL;
1142 }
1143 if (unlikely(sk->sk_policy[1] != NULL)) {
1144 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
1145 sk->sk_policy[1] = NULL;
1146 }
1147}
1148
1149#else
1150
1151static inline void xfrm_sk_free_policy(struct sock *sk) {}
1152static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
1153static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1154static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1155static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1156{
1157 return 1;
1158}
1159static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1160{
1161 return 1;
1162}
1163static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1164{
1165 return 1;
1166}
1167static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1168 struct flowi *fl,
1169 unsigned int family)
1170{
1171 return -ENOSYS;
1172}
1173static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1174 struct sk_buff *skb)
1175{
1176 return 1;
1177}
1178static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1179 struct sk_buff *skb)
1180{
1181 return 1;
1182}
1183#endif
1184
1185static __inline__
1186xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family)
1187{
1188 switch (family){
1189 case AF_INET:
1190 return (xfrm_address_t *)&fl->u.ip4.daddr;
1191 case AF_INET6:
1192 return (xfrm_address_t *)&fl->u.ip6.daddr;
1193 }
1194 return NULL;
1195}
1196
1197static __inline__
1198xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family)
1199{
1200 switch (family){
1201 case AF_INET:
1202 return (xfrm_address_t *)&fl->u.ip4.saddr;
1203 case AF_INET6:
1204 return (xfrm_address_t *)&fl->u.ip6.saddr;
1205 }
1206 return NULL;
1207}
1208
1209static __inline__
1210void xfrm_flowi_addr_get(const struct flowi *fl,
1211 xfrm_address_t *saddr, xfrm_address_t *daddr,
1212 unsigned short family)
1213{
1214 switch(family) {
1215 case AF_INET:
1216 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4));
1217 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4));
1218 break;
1219 case AF_INET6:
1220 *(struct in6_addr *)saddr->a6 = fl->u.ip6.saddr;
1221 *(struct in6_addr *)daddr->a6 = fl->u.ip6.daddr;
1222 break;
1223 }
1224}
1225
1226static __inline__ int
1227__xfrm4_state_addr_check(const struct xfrm_state *x,
1228 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1229{
1230 if (daddr->a4 == x->id.daddr.a4 &&
1231 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1232 return 1;
1233 return 0;
1234}
1235
1236static __inline__ int
1237__xfrm6_state_addr_check(const struct xfrm_state *x,
1238 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1239{
1240 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1241 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
1242 ipv6_addr_any((struct in6_addr *)saddr) ||
1243 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1244 return 1;
1245 return 0;
1246}
1247
1248static __inline__ int
1249xfrm_state_addr_check(const struct xfrm_state *x,
1250 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1251 unsigned short family)
1252{
1253 switch (family) {
1254 case AF_INET:
1255 return __xfrm4_state_addr_check(x, daddr, saddr);
1256 case AF_INET6:
1257 return __xfrm6_state_addr_check(x, daddr, saddr);
1258 }
1259 return 0;
1260}
1261
1262static __inline__ int
1263xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl,
1264 unsigned short family)
1265{
1266 switch (family) {
1267 case AF_INET:
1268 return __xfrm4_state_addr_check(x,
1269 (const xfrm_address_t *)&fl->u.ip4.daddr,
1270 (const xfrm_address_t *)&fl->u.ip4.saddr);
1271 case AF_INET6:
1272 return __xfrm6_state_addr_check(x,
1273 (const xfrm_address_t *)&fl->u.ip6.daddr,
1274 (const xfrm_address_t *)&fl->u.ip6.saddr);
1275 }
1276 return 0;
1277}
1278
1279static inline int xfrm_state_kern(const struct xfrm_state *x)
1280{
1281 return atomic_read(&x->tunnel_users);
1282}
1283
1284static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1285{
1286 return (!userproto || proto == userproto ||
1287 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1288 proto == IPPROTO_ESP ||
1289 proto == IPPROTO_COMP)));
1290}
1291
1292/*
1293 * xfrm algorithm information
1294 */
1295struct xfrm_algo_aead_info {
1296 u16 icv_truncbits;
1297};
1298
1299struct xfrm_algo_auth_info {
1300 u16 icv_truncbits;
1301 u16 icv_fullbits;
1302};
1303
1304struct xfrm_algo_encr_info {
1305 u16 blockbits;
1306 u16 defkeybits;
1307};
1308
1309struct xfrm_algo_comp_info {
1310 u16 threshold;
1311};
1312
1313struct xfrm_algo_desc {
1314 char *name;
1315 char *compat;
1316 u8 available:1;
1317 union {
1318 struct xfrm_algo_aead_info aead;
1319 struct xfrm_algo_auth_info auth;
1320 struct xfrm_algo_encr_info encr;
1321 struct xfrm_algo_comp_info comp;
1322 } uinfo;
1323 struct sadb_alg desc;
1324};
1325
1326/* XFRM tunnel handlers. */
1327struct xfrm_tunnel {
1328 int (*handler)(struct sk_buff *skb);
1329 int (*err_handler)(struct sk_buff *skb, u32 info);
1330
1331 struct xfrm_tunnel __rcu *next;
1332 int priority;
1333};
1334
1335struct xfrm6_tunnel {
1336 int (*handler)(struct sk_buff *skb);
1337 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1338 u8 type, u8 code, int offset, __be32 info);
1339 struct xfrm6_tunnel __rcu *next;
1340 int priority;
1341};
1342
1343extern void xfrm_init(void);
1344extern void xfrm4_init(int rt_hash_size);
1345extern int xfrm_state_init(struct net *net);
1346extern void xfrm_state_fini(struct net *net);
1347extern void xfrm4_state_init(void);
1348#ifdef CONFIG_XFRM
1349extern int xfrm6_init(void);
1350extern void xfrm6_fini(void);
1351extern int xfrm6_state_init(void);
1352extern void xfrm6_state_fini(void);
1353#else
1354static inline int xfrm6_init(void)
1355{
1356 return 0;
1357}
1358static inline void xfrm6_fini(void)
1359{
1360 ;
1361}
1362#endif
1363
1364#ifdef CONFIG_XFRM_STATISTICS
1365extern int xfrm_proc_init(struct net *net);
1366extern void xfrm_proc_fini(struct net *net);
1367#endif
1368
1369extern int xfrm_sysctl_init(struct net *net);
1370#ifdef CONFIG_SYSCTL
1371extern void xfrm_sysctl_fini(struct net *net);
1372#else
1373static inline void xfrm_sysctl_fini(struct net *net)
1374{
1375}
1376#endif
1377
1378extern void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto);
1379extern int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1380 int (*func)(struct xfrm_state *, int, void*), void *);
1381extern void xfrm_state_walk_done(struct xfrm_state_walk *walk);
1382extern struct xfrm_state *xfrm_state_alloc(struct net *net);
1383extern struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr,
1384 const xfrm_address_t *saddr,
1385 const struct flowi *fl,
1386 struct xfrm_tmpl *tmpl,
1387 struct xfrm_policy *pol, int *err,
1388 unsigned short family);
1389extern struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark,
1390 xfrm_address_t *daddr,
1391 xfrm_address_t *saddr,
1392 unsigned short family,
1393 u8 mode, u8 proto, u32 reqid);
1394extern int xfrm_state_check_expire(struct xfrm_state *x);
1395extern void xfrm_state_insert(struct xfrm_state *x);
1396extern int xfrm_state_add(struct xfrm_state *x);
1397extern int xfrm_state_update(struct xfrm_state *x);
1398extern struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1399 const xfrm_address_t *daddr, __be32 spi,
1400 u8 proto, unsigned short family);
1401extern struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1402 const xfrm_address_t *daddr,
1403 const xfrm_address_t *saddr,
1404 u8 proto,
1405 unsigned short family);
1406#ifdef CONFIG_XFRM_SUB_POLICY
1407extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1408 int n, unsigned short family);
1409extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1410 int n, unsigned short family);
1411#else
1412static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1413 int n, unsigned short family)
1414{
1415 return -ENOSYS;
1416}
1417
1418static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1419 int n, unsigned short family)
1420{
1421 return -ENOSYS;
1422}
1423#endif
1424
1425struct xfrmk_sadinfo {
1426 u32 sadhcnt; /* current hash bkts */
1427 u32 sadhmcnt; /* max allowed hash bkts */
1428 u32 sadcnt; /* current running count */
1429};
1430
1431struct xfrmk_spdinfo {
1432 u32 incnt;
1433 u32 outcnt;
1434 u32 fwdcnt;
1435 u32 inscnt;
1436 u32 outscnt;
1437 u32 fwdscnt;
1438 u32 spdhcnt;
1439 u32 spdhmcnt;
1440};
1441
1442extern struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark,
1443 u32 seq);
1444extern int xfrm_state_delete(struct xfrm_state *x);
1445extern int xfrm_state_flush(struct net *net, u8 proto, struct xfrm_audit *audit_info);
1446extern void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1447extern void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1448extern u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq);
1449extern int xfrm_init_replay(struct xfrm_state *x);
1450extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1451extern int __xfrm_init_state(struct xfrm_state *x, bool init_replay);
1452extern int xfrm_init_state(struct xfrm_state *x);
1453extern int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
1454extern int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi,
1455 int encap_type);
1456extern int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1457extern int xfrm_output_resume(struct sk_buff *skb, int err);
1458extern int xfrm_output(struct sk_buff *skb);
1459extern int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1460extern int xfrm4_extract_header(struct sk_buff *skb);
1461extern int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1462extern int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1463 int encap_type);
1464extern int xfrm4_transport_finish(struct sk_buff *skb, int async);
1465extern int xfrm4_rcv(struct sk_buff *skb);
1466
1467static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1468{
1469 return xfrm4_rcv_encap(skb, nexthdr, spi, 0);
1470}
1471
1472extern int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1473extern int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1474extern int xfrm4_output(struct sk_buff *skb);
1475extern int xfrm4_output_finish(struct sk_buff *skb);
1476extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1477extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1478extern int xfrm6_extract_header(struct sk_buff *skb);
1479extern int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1480extern int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi);
1481extern int xfrm6_transport_finish(struct sk_buff *skb, int async);
1482extern int xfrm6_rcv(struct sk_buff *skb);
1483extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1484 xfrm_address_t *saddr, u8 proto);
1485extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1486extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1487extern __be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1488extern __be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr);
1489extern int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1490extern int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1491extern int xfrm6_output(struct sk_buff *skb);
1492extern int xfrm6_output_finish(struct sk_buff *skb);
1493extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1494 u8 **prevhdr);
1495
1496#ifdef CONFIG_XFRM
1497extern int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1498extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
1499#else
1500static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1501{
1502 return -ENOPROTOOPT;
1503}
1504
1505static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1506{
1507 /* should not happen */
1508 kfree_skb(skb);
1509 return 0;
1510}
1511#endif
1512
1513struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1514
1515extern void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1516extern int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1517 int (*func)(struct xfrm_policy *, int, int, void*), void *);
1518extern void xfrm_policy_walk_done(struct xfrm_policy_walk *walk);
1519int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1520struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark,
1521 u8 type, int dir,
1522 struct xfrm_selector *sel,
1523 struct xfrm_sec_ctx *ctx, int delete,
1524 int *err);
1525struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8, int dir, u32 id, int delete, int *err);
1526int xfrm_policy_flush(struct net *net, u8 type, struct xfrm_audit *audit_info);
1527u32 xfrm_get_acqseq(void);
1528extern int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1529struct xfrm_state *xfrm_find_acq(struct net *net, struct xfrm_mark *mark,
1530 u8 mode, u32 reqid, u8 proto,
1531 const xfrm_address_t *daddr,
1532 const xfrm_address_t *saddr, int create,
1533 unsigned short family);
1534extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1535
1536#ifdef CONFIG_XFRM_MIGRATE
1537extern int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1538 const struct xfrm_migrate *m, int num_bundles,
1539 const struct xfrm_kmaddress *k);
1540extern struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m);
1541extern struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
1542 struct xfrm_migrate *m);
1543extern int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1544 struct xfrm_migrate *m, int num_bundles,
1545 struct xfrm_kmaddress *k);
1546#endif
1547
1548extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1549extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid);
1550extern int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
1551
1552extern void xfrm_input_init(void);
1553extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1554
1555extern void xfrm_probe_algs(void);
1556extern int xfrm_count_auth_supported(void);
1557extern int xfrm_count_enc_supported(void);
1558extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1559extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1560extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1561extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1562extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1563extern struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe);
1564extern struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe);
1565extern struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe);
1566extern struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len,
1567 int probe);
1568
1569static inline int xfrm_addr_cmp(const xfrm_address_t *a,
1570 const xfrm_address_t *b,
1571 int family)
1572{
1573 switch (family) {
1574 default:
1575 case AF_INET:
1576 return (__force u32)a->a4 - (__force u32)b->a4;
1577 case AF_INET6:
1578 return ipv6_addr_cmp((const struct in6_addr *)a,
1579 (const struct in6_addr *)b);
1580 }
1581}
1582
1583static inline int xfrm_policy_id2dir(u32 index)
1584{
1585 return index & 7;
1586}
1587
1588#ifdef CONFIG_XFRM
1589static inline int xfrm_aevent_is_on(struct net *net)
1590{
1591 struct sock *nlsk;
1592 int ret = 0;
1593
1594 rcu_read_lock();
1595 nlsk = rcu_dereference(net->xfrm.nlsk);
1596 if (nlsk)
1597 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1598 rcu_read_unlock();
1599 return ret;
1600}
1601#endif
1602
1603static inline int xfrm_alg_len(const struct xfrm_algo *alg)
1604{
1605 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1606}
1607
1608static inline int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg)
1609{
1610 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1611}
1612
1613static inline int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn)
1614{
1615 return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32);
1616}
1617
1618#ifdef CONFIG_XFRM_MIGRATE
1619static inline int xfrm_replay_clone(struct xfrm_state *x,
1620 struct xfrm_state *orig)
1621{
1622 x->replay_esn = kzalloc(xfrm_replay_state_esn_len(orig->replay_esn),
1623 GFP_KERNEL);
1624 if (!x->replay_esn)
1625 return -ENOMEM;
1626
1627 x->replay_esn->bmp_len = orig->replay_esn->bmp_len;
1628 x->replay_esn->replay_window = orig->replay_esn->replay_window;
1629
1630 x->preplay_esn = kmemdup(x->replay_esn,
1631 xfrm_replay_state_esn_len(x->replay_esn),
1632 GFP_KERNEL);
1633 if (!x->preplay_esn) {
1634 kfree(x->replay_esn);
1635 return -ENOMEM;
1636 }
1637
1638 return 0;
1639}
1640
1641static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1642{
1643 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1644}
1645
1646static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1647{
1648 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1649}
1650
1651static inline void xfrm_states_put(struct xfrm_state **states, int n)
1652{
1653 int i;
1654 for (i = 0; i < n; i++)
1655 xfrm_state_put(*(states + i));
1656}
1657
1658static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1659{
1660 int i;
1661 for (i = 0; i < n; i++)
1662 xfrm_state_delete(*(states + i));
1663}
1664#endif
1665
1666#ifdef CONFIG_XFRM
1667static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1668{
1669 return skb->sp->xvec[skb->sp->len - 1];
1670}
1671#endif
1672
1673static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
1674{
1675 if (attrs[XFRMA_MARK])
1676 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark));
1677 else
1678 m->v = m->m = 0;
1679
1680 return m->v & m->m;
1681}
1682
1683static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m)
1684{
1685 if ((m->m | m->v) &&
1686 nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m))
1687 goto nla_put_failure;
1688 return 0;
1689
1690nla_put_failure:
1691 return -1;
1692}
1693
1694#endif /* _NET_XFRM_H */
1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _NET_XFRM_H
3#define _NET_XFRM_H
4
5#include <linux/compiler.h>
6#include <linux/xfrm.h>
7#include <linux/spinlock.h>
8#include <linux/list.h>
9#include <linux/skbuff.h>
10#include <linux/socket.h>
11#include <linux/pfkeyv2.h>
12#include <linux/ipsec.h>
13#include <linux/in6.h>
14#include <linux/mutex.h>
15#include <linux/audit.h>
16#include <linux/slab.h>
17#include <linux/refcount.h>
18#include <linux/sockptr.h>
19
20#include <net/sock.h>
21#include <net/dst.h>
22#include <net/ip.h>
23#include <net/route.h>
24#include <net/ipv6.h>
25#include <net/ip6_fib.h>
26#include <net/flow.h>
27#include <net/gro_cells.h>
28
29#include <linux/interrupt.h>
30
31#ifdef CONFIG_XFRM_STATISTICS
32#include <net/snmp.h>
33#endif
34
35#define XFRM_PROTO_ESP 50
36#define XFRM_PROTO_AH 51
37#define XFRM_PROTO_COMP 108
38#define XFRM_PROTO_IPIP 4
39#define XFRM_PROTO_IPV6 41
40#define XFRM_PROTO_ROUTING IPPROTO_ROUTING
41#define XFRM_PROTO_DSTOPTS IPPROTO_DSTOPTS
42
43#define XFRM_ALIGN4(len) (((len) + 3) & ~3)
44#define XFRM_ALIGN8(len) (((len) + 7) & ~7)
45#define MODULE_ALIAS_XFRM_MODE(family, encap) \
46 MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap))
47#define MODULE_ALIAS_XFRM_TYPE(family, proto) \
48 MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto))
49#define MODULE_ALIAS_XFRM_OFFLOAD_TYPE(family, proto) \
50 MODULE_ALIAS("xfrm-offload-" __stringify(family) "-" __stringify(proto))
51
52#ifdef CONFIG_XFRM_STATISTICS
53#define XFRM_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.xfrm_statistics, field)
54#else
55#define XFRM_INC_STATS(net, field) ((void)(net))
56#endif
57
58
59/* Organization of SPD aka "XFRM rules"
60 ------------------------------------
61
62 Basic objects:
63 - policy rule, struct xfrm_policy (=SPD entry)
64 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
65 - instance of a transformer, struct xfrm_state (=SA)
66 - template to clone xfrm_state, struct xfrm_tmpl
67
68 SPD is plain linear list of xfrm_policy rules, ordered by priority.
69 (To be compatible with existing pfkeyv2 implementations,
70 many rules with priority of 0x7fffffff are allowed to exist and
71 such rules are ordered in an unpredictable way, thanks to bsd folks.)
72
73 Lookup is plain linear search until the first match with selector.
74
75 If "action" is "block", then we prohibit the flow, otherwise:
76 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
77 policy entry has list of up to XFRM_MAX_DEPTH transformations,
78 described by templates xfrm_tmpl. Each template is resolved
79 to a complete xfrm_state (see below) and we pack bundle of transformations
80 to a dst_entry returned to requestor.
81
82 dst -. xfrm .-> xfrm_state #1
83 |---. child .-> dst -. xfrm .-> xfrm_state #2
84 |---. child .-> dst -. xfrm .-> xfrm_state #3
85 |---. child .-> NULL
86
87 Bundles are cached at xrfm_policy struct (field ->bundles).
88
89
90 Resolution of xrfm_tmpl
91 -----------------------
92 Template contains:
93 1. ->mode Mode: transport or tunnel
94 2. ->id.proto Protocol: AH/ESP/IPCOMP
95 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode.
96 Q: allow to resolve security gateway?
97 4. ->id.spi If not zero, static SPI.
98 5. ->saddr Local tunnel endpoint, ignored for transport mode.
99 6. ->algos List of allowed algos. Plain bitmask now.
100 Q: ealgos, aalgos, calgos. What a mess...
101 7. ->share Sharing mode.
102 Q: how to implement private sharing mode? To add struct sock* to
103 flow id?
104
105 Having this template we search through SAD searching for entries
106 with appropriate mode/proto/algo, permitted by selector.
107 If no appropriate entry found, it is requested from key manager.
108
109 PROBLEMS:
110 Q: How to find all the bundles referring to a physical path for
111 PMTU discovery? Seems, dst should contain list of all parents...
112 and enter to infinite locking hierarchy disaster.
113 No! It is easier, we will not search for them, let them find us.
114 We add genid to each dst plus pointer to genid of raw IP route,
115 pmtu disc will update pmtu on raw IP route and increase its genid.
116 dst_check() will see this for top level and trigger resyncing
117 metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
118 */
119
120struct xfrm_state_walk {
121 struct list_head all;
122 u8 state;
123 u8 dying;
124 u8 proto;
125 u32 seq;
126 struct xfrm_address_filter *filter;
127};
128
129enum {
130 XFRM_DEV_OFFLOAD_IN = 1,
131 XFRM_DEV_OFFLOAD_OUT,
132 XFRM_DEV_OFFLOAD_FWD,
133};
134
135enum {
136 XFRM_DEV_OFFLOAD_UNSPECIFIED,
137 XFRM_DEV_OFFLOAD_CRYPTO,
138 XFRM_DEV_OFFLOAD_PACKET,
139};
140
141struct xfrm_dev_offload {
142 struct net_device *dev;
143 netdevice_tracker dev_tracker;
144 struct net_device *real_dev;
145 unsigned long offload_handle;
146 u8 dir : 2;
147 u8 type : 2;
148};
149
150struct xfrm_mode {
151 u8 encap;
152 u8 family;
153 u8 flags;
154};
155
156/* Flags for xfrm_mode. */
157enum {
158 XFRM_MODE_FLAG_TUNNEL = 1,
159};
160
161enum xfrm_replay_mode {
162 XFRM_REPLAY_MODE_LEGACY,
163 XFRM_REPLAY_MODE_BMP,
164 XFRM_REPLAY_MODE_ESN,
165};
166
167/* Full description of state of transformer. */
168struct xfrm_state {
169 possible_net_t xs_net;
170 union {
171 struct hlist_node gclist;
172 struct hlist_node bydst;
173 };
174 struct hlist_node bysrc;
175 struct hlist_node byspi;
176 struct hlist_node byseq;
177
178 refcount_t refcnt;
179 spinlock_t lock;
180
181 struct xfrm_id id;
182 struct xfrm_selector sel;
183 struct xfrm_mark mark;
184 u32 if_id;
185 u32 tfcpad;
186
187 u32 genid;
188
189 /* Key manager bits */
190 struct xfrm_state_walk km;
191
192 /* Parameters of this state. */
193 struct {
194 u32 reqid;
195 u8 mode;
196 u8 replay_window;
197 u8 aalgo, ealgo, calgo;
198 u8 flags;
199 u16 family;
200 xfrm_address_t saddr;
201 int header_len;
202 int trailer_len;
203 u32 extra_flags;
204 struct xfrm_mark smark;
205 } props;
206
207 struct xfrm_lifetime_cfg lft;
208
209 /* Data for transformer */
210 struct xfrm_algo_auth *aalg;
211 struct xfrm_algo *ealg;
212 struct xfrm_algo *calg;
213 struct xfrm_algo_aead *aead;
214 const char *geniv;
215
216 /* mapping change rate limiting */
217 __be16 new_mapping_sport;
218 u32 new_mapping; /* seconds */
219 u32 mapping_maxage; /* seconds for input SA */
220
221 /* Data for encapsulator */
222 struct xfrm_encap_tmpl *encap;
223 struct sock __rcu *encap_sk;
224
225 /* Data for care-of address */
226 xfrm_address_t *coaddr;
227
228 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
229 struct xfrm_state *tunnel;
230
231 /* If a tunnel, number of users + 1 */
232 atomic_t tunnel_users;
233
234 /* State for replay detection */
235 struct xfrm_replay_state replay;
236 struct xfrm_replay_state_esn *replay_esn;
237
238 /* Replay detection state at the time we sent the last notification */
239 struct xfrm_replay_state preplay;
240 struct xfrm_replay_state_esn *preplay_esn;
241
242 /* replay detection mode */
243 enum xfrm_replay_mode repl_mode;
244 /* internal flag that only holds state for delayed aevent at the
245 * moment
246 */
247 u32 xflags;
248
249 /* Replay detection notification settings */
250 u32 replay_maxage;
251 u32 replay_maxdiff;
252
253 /* Replay detection notification timer */
254 struct timer_list rtimer;
255
256 /* Statistics */
257 struct xfrm_stats stats;
258
259 struct xfrm_lifetime_cur curlft;
260 struct hrtimer mtimer;
261
262 struct xfrm_dev_offload xso;
263
264 /* used to fix curlft->add_time when changing date */
265 long saved_tmo;
266
267 /* Last used time */
268 time64_t lastused;
269
270 struct page_frag xfrag;
271
272 /* Reference to data common to all the instances of this
273 * transformer. */
274 const struct xfrm_type *type;
275 struct xfrm_mode inner_mode;
276 struct xfrm_mode inner_mode_iaf;
277 struct xfrm_mode outer_mode;
278
279 const struct xfrm_type_offload *type_offload;
280
281 /* Security context */
282 struct xfrm_sec_ctx *security;
283
284 /* Private data of this transformer, format is opaque,
285 * interpreted by xfrm_type methods. */
286 void *data;
287};
288
289static inline struct net *xs_net(struct xfrm_state *x)
290{
291 return read_pnet(&x->xs_net);
292}
293
294/* xflags - make enum if more show up */
295#define XFRM_TIME_DEFER 1
296#define XFRM_SOFT_EXPIRE 2
297
298enum {
299 XFRM_STATE_VOID,
300 XFRM_STATE_ACQ,
301 XFRM_STATE_VALID,
302 XFRM_STATE_ERROR,
303 XFRM_STATE_EXPIRED,
304 XFRM_STATE_DEAD
305};
306
307/* callback structure passed from either netlink or pfkey */
308struct km_event {
309 union {
310 u32 hard;
311 u32 proto;
312 u32 byid;
313 u32 aevent;
314 u32 type;
315 } data;
316
317 u32 seq;
318 u32 portid;
319 u32 event;
320 struct net *net;
321};
322
323struct xfrm_if_decode_session_result {
324 struct net *net;
325 u32 if_id;
326};
327
328struct xfrm_if_cb {
329 bool (*decode_session)(struct sk_buff *skb,
330 unsigned short family,
331 struct xfrm_if_decode_session_result *res);
332};
333
334void xfrm_if_register_cb(const struct xfrm_if_cb *ifcb);
335void xfrm_if_unregister_cb(void);
336
337struct net_device;
338struct xfrm_type;
339struct xfrm_dst;
340struct xfrm_policy_afinfo {
341 struct dst_ops *dst_ops;
342 struct dst_entry *(*dst_lookup)(struct net *net,
343 int tos, int oif,
344 const xfrm_address_t *saddr,
345 const xfrm_address_t *daddr,
346 u32 mark);
347 int (*get_saddr)(struct net *net, int oif,
348 xfrm_address_t *saddr,
349 xfrm_address_t *daddr,
350 u32 mark);
351 int (*fill_dst)(struct xfrm_dst *xdst,
352 struct net_device *dev,
353 const struct flowi *fl);
354 struct dst_entry *(*blackhole_route)(struct net *net, struct dst_entry *orig);
355};
356
357int xfrm_policy_register_afinfo(const struct xfrm_policy_afinfo *afinfo, int family);
358void xfrm_policy_unregister_afinfo(const struct xfrm_policy_afinfo *afinfo);
359void km_policy_notify(struct xfrm_policy *xp, int dir,
360 const struct km_event *c);
361void km_state_notify(struct xfrm_state *x, const struct km_event *c);
362
363struct xfrm_tmpl;
364int km_query(struct xfrm_state *x, struct xfrm_tmpl *t,
365 struct xfrm_policy *pol);
366void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
367int __xfrm_state_delete(struct xfrm_state *x);
368
369struct xfrm_state_afinfo {
370 u8 family;
371 u8 proto;
372
373 const struct xfrm_type_offload *type_offload_esp;
374
375 const struct xfrm_type *type_esp;
376 const struct xfrm_type *type_ipip;
377 const struct xfrm_type *type_ipip6;
378 const struct xfrm_type *type_comp;
379 const struct xfrm_type *type_ah;
380 const struct xfrm_type *type_routing;
381 const struct xfrm_type *type_dstopts;
382
383 int (*output)(struct net *net, struct sock *sk, struct sk_buff *skb);
384 int (*transport_finish)(struct sk_buff *skb,
385 int async);
386 void (*local_error)(struct sk_buff *skb, u32 mtu);
387};
388
389int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
390int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
391struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family);
392struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family);
393
394struct xfrm_input_afinfo {
395 u8 family;
396 bool is_ipip;
397 int (*callback)(struct sk_buff *skb, u8 protocol,
398 int err);
399};
400
401int xfrm_input_register_afinfo(const struct xfrm_input_afinfo *afinfo);
402int xfrm_input_unregister_afinfo(const struct xfrm_input_afinfo *afinfo);
403
404void xfrm_flush_gc(void);
405void xfrm_state_delete_tunnel(struct xfrm_state *x);
406
407struct xfrm_type {
408 struct module *owner;
409 u8 proto;
410 u8 flags;
411#define XFRM_TYPE_NON_FRAGMENT 1
412#define XFRM_TYPE_REPLAY_PROT 2
413#define XFRM_TYPE_LOCAL_COADDR 4
414#define XFRM_TYPE_REMOTE_COADDR 8
415
416 int (*init_state)(struct xfrm_state *x,
417 struct netlink_ext_ack *extack);
418 void (*destructor)(struct xfrm_state *);
419 int (*input)(struct xfrm_state *, struct sk_buff *skb);
420 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
421 int (*reject)(struct xfrm_state *, struct sk_buff *,
422 const struct flowi *);
423};
424
425int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
426void xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
427
428struct xfrm_type_offload {
429 struct module *owner;
430 u8 proto;
431 void (*encap)(struct xfrm_state *, struct sk_buff *pskb);
432 int (*input_tail)(struct xfrm_state *x, struct sk_buff *skb);
433 int (*xmit)(struct xfrm_state *, struct sk_buff *pskb, netdev_features_t features);
434};
435
436int xfrm_register_type_offload(const struct xfrm_type_offload *type, unsigned short family);
437void xfrm_unregister_type_offload(const struct xfrm_type_offload *type, unsigned short family);
438
439static inline int xfrm_af2proto(unsigned int family)
440{
441 switch(family) {
442 case AF_INET:
443 return IPPROTO_IPIP;
444 case AF_INET6:
445 return IPPROTO_IPV6;
446 default:
447 return 0;
448 }
449}
450
451static inline const struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
452{
453 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
454 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
455 return &x->inner_mode;
456 else
457 return &x->inner_mode_iaf;
458}
459
460struct xfrm_tmpl {
461/* id in template is interpreted as:
462 * daddr - destination of tunnel, may be zero for transport mode.
463 * spi - zero to acquire spi. Not zero if spi is static, then
464 * daddr must be fixed too.
465 * proto - AH/ESP/IPCOMP
466 */
467 struct xfrm_id id;
468
469/* Source address of tunnel. Ignored, if it is not a tunnel. */
470 xfrm_address_t saddr;
471
472 unsigned short encap_family;
473
474 u32 reqid;
475
476/* Mode: transport, tunnel etc. */
477 u8 mode;
478
479/* Sharing mode: unique, this session only, this user only etc. */
480 u8 share;
481
482/* May skip this transfomration if no SA is found */
483 u8 optional;
484
485/* Skip aalgos/ealgos/calgos checks. */
486 u8 allalgs;
487
488/* Bit mask of algos allowed for acquisition */
489 u32 aalgos;
490 u32 ealgos;
491 u32 calgos;
492};
493
494#define XFRM_MAX_DEPTH 6
495#define XFRM_MAX_OFFLOAD_DEPTH 1
496
497struct xfrm_policy_walk_entry {
498 struct list_head all;
499 u8 dead;
500};
501
502struct xfrm_policy_walk {
503 struct xfrm_policy_walk_entry walk;
504 u8 type;
505 u32 seq;
506};
507
508struct xfrm_policy_queue {
509 struct sk_buff_head hold_queue;
510 struct timer_list hold_timer;
511 unsigned long timeout;
512};
513
514struct xfrm_policy {
515 possible_net_t xp_net;
516 struct hlist_node bydst;
517 struct hlist_node byidx;
518
519 /* This lock only affects elements except for entry. */
520 rwlock_t lock;
521 refcount_t refcnt;
522 u32 pos;
523 struct timer_list timer;
524
525 atomic_t genid;
526 u32 priority;
527 u32 index;
528 u32 if_id;
529 struct xfrm_mark mark;
530 struct xfrm_selector selector;
531 struct xfrm_lifetime_cfg lft;
532 struct xfrm_lifetime_cur curlft;
533 struct xfrm_policy_walk_entry walk;
534 struct xfrm_policy_queue polq;
535 bool bydst_reinsert;
536 u8 type;
537 u8 action;
538 u8 flags;
539 u8 xfrm_nr;
540 u16 family;
541 struct xfrm_sec_ctx *security;
542 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
543 struct hlist_node bydst_inexact_list;
544 struct rcu_head rcu;
545
546 struct xfrm_dev_offload xdo;
547};
548
549static inline struct net *xp_net(const struct xfrm_policy *xp)
550{
551 return read_pnet(&xp->xp_net);
552}
553
554struct xfrm_kmaddress {
555 xfrm_address_t local;
556 xfrm_address_t remote;
557 u32 reserved;
558 u16 family;
559};
560
561struct xfrm_migrate {
562 xfrm_address_t old_daddr;
563 xfrm_address_t old_saddr;
564 xfrm_address_t new_daddr;
565 xfrm_address_t new_saddr;
566 u8 proto;
567 u8 mode;
568 u16 reserved;
569 u32 reqid;
570 u16 old_family;
571 u16 new_family;
572};
573
574#define XFRM_KM_TIMEOUT 30
575/* what happened */
576#define XFRM_REPLAY_UPDATE XFRM_AE_CR
577#define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
578
579/* default aevent timeout in units of 100ms */
580#define XFRM_AE_ETIME 10
581/* Async Event timer multiplier */
582#define XFRM_AE_ETH_M 10
583/* default seq threshold size */
584#define XFRM_AE_SEQT_SIZE 2
585
586struct xfrm_mgr {
587 struct list_head list;
588 int (*notify)(struct xfrm_state *x, const struct km_event *c);
589 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp);
590 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
591 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
592 int (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c);
593 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
594 int (*migrate)(const struct xfrm_selector *sel,
595 u8 dir, u8 type,
596 const struct xfrm_migrate *m,
597 int num_bundles,
598 const struct xfrm_kmaddress *k,
599 const struct xfrm_encap_tmpl *encap);
600 bool (*is_alive)(const struct km_event *c);
601};
602
603void xfrm_register_km(struct xfrm_mgr *km);
604void xfrm_unregister_km(struct xfrm_mgr *km);
605
606struct xfrm_tunnel_skb_cb {
607 union {
608 struct inet_skb_parm h4;
609 struct inet6_skb_parm h6;
610 } header;
611
612 union {
613 struct ip_tunnel *ip4;
614 struct ip6_tnl *ip6;
615 } tunnel;
616};
617
618#define XFRM_TUNNEL_SKB_CB(__skb) ((struct xfrm_tunnel_skb_cb *)&((__skb)->cb[0]))
619
620/*
621 * This structure is used for the duration where packets are being
622 * transformed by IPsec. As soon as the packet leaves IPsec the
623 * area beyond the generic IP part may be overwritten.
624 */
625struct xfrm_skb_cb {
626 struct xfrm_tunnel_skb_cb header;
627
628 /* Sequence number for replay protection. */
629 union {
630 struct {
631 __u32 low;
632 __u32 hi;
633 } output;
634 struct {
635 __be32 low;
636 __be32 hi;
637 } input;
638 } seq;
639};
640
641#define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
642
643/*
644 * This structure is used by the afinfo prepare_input/prepare_output functions
645 * to transmit header information to the mode input/output functions.
646 */
647struct xfrm_mode_skb_cb {
648 struct xfrm_tunnel_skb_cb header;
649
650 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
651 __be16 id;
652 __be16 frag_off;
653
654 /* IP header length (excluding options or extension headers). */
655 u8 ihl;
656
657 /* TOS for IPv4, class for IPv6. */
658 u8 tos;
659
660 /* TTL for IPv4, hop limitfor IPv6. */
661 u8 ttl;
662
663 /* Protocol for IPv4, NH for IPv6. */
664 u8 protocol;
665
666 /* Option length for IPv4, zero for IPv6. */
667 u8 optlen;
668
669 /* Used by IPv6 only, zero for IPv4. */
670 u8 flow_lbl[3];
671};
672
673#define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
674
675/*
676 * This structure is used by the input processing to locate the SPI and
677 * related information.
678 */
679struct xfrm_spi_skb_cb {
680 struct xfrm_tunnel_skb_cb header;
681
682 unsigned int daddroff;
683 unsigned int family;
684 __be32 seq;
685};
686
687#define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
688
689#ifdef CONFIG_AUDITSYSCALL
690static inline struct audit_buffer *xfrm_audit_start(const char *op)
691{
692 struct audit_buffer *audit_buf = NULL;
693
694 if (audit_enabled == AUDIT_OFF)
695 return NULL;
696 audit_buf = audit_log_start(audit_context(), GFP_ATOMIC,
697 AUDIT_MAC_IPSEC_EVENT);
698 if (audit_buf == NULL)
699 return NULL;
700 audit_log_format(audit_buf, "op=%s", op);
701 return audit_buf;
702}
703
704static inline void xfrm_audit_helper_usrinfo(bool task_valid,
705 struct audit_buffer *audit_buf)
706{
707 const unsigned int auid = from_kuid(&init_user_ns, task_valid ?
708 audit_get_loginuid(current) :
709 INVALID_UID);
710 const unsigned int ses = task_valid ? audit_get_sessionid(current) :
711 AUDIT_SID_UNSET;
712
713 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
714 audit_log_task_context(audit_buf);
715}
716
717void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid);
718void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
719 bool task_valid);
720void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid);
721void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid);
722void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
723 struct sk_buff *skb);
724void xfrm_audit_state_replay(struct xfrm_state *x, struct sk_buff *skb,
725 __be32 net_seq);
726void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
727void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, __be32 net_spi,
728 __be32 net_seq);
729void xfrm_audit_state_icvfail(struct xfrm_state *x, struct sk_buff *skb,
730 u8 proto);
731#else
732
733static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
734 bool task_valid)
735{
736}
737
738static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
739 bool task_valid)
740{
741}
742
743static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
744 bool task_valid)
745{
746}
747
748static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
749 bool task_valid)
750{
751}
752
753static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
754 struct sk_buff *skb)
755{
756}
757
758static inline void xfrm_audit_state_replay(struct xfrm_state *x,
759 struct sk_buff *skb, __be32 net_seq)
760{
761}
762
763static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
764 u16 family)
765{
766}
767
768static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
769 __be32 net_spi, __be32 net_seq)
770{
771}
772
773static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
774 struct sk_buff *skb, u8 proto)
775{
776}
777#endif /* CONFIG_AUDITSYSCALL */
778
779static inline void xfrm_pol_hold(struct xfrm_policy *policy)
780{
781 if (likely(policy != NULL))
782 refcount_inc(&policy->refcnt);
783}
784
785void xfrm_policy_destroy(struct xfrm_policy *policy);
786
787static inline void xfrm_pol_put(struct xfrm_policy *policy)
788{
789 if (refcount_dec_and_test(&policy->refcnt))
790 xfrm_policy_destroy(policy);
791}
792
793static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
794{
795 int i;
796 for (i = npols - 1; i >= 0; --i)
797 xfrm_pol_put(pols[i]);
798}
799
800void __xfrm_state_destroy(struct xfrm_state *, bool);
801
802static inline void __xfrm_state_put(struct xfrm_state *x)
803{
804 refcount_dec(&x->refcnt);
805}
806
807static inline void xfrm_state_put(struct xfrm_state *x)
808{
809 if (refcount_dec_and_test(&x->refcnt))
810 __xfrm_state_destroy(x, false);
811}
812
813static inline void xfrm_state_put_sync(struct xfrm_state *x)
814{
815 if (refcount_dec_and_test(&x->refcnt))
816 __xfrm_state_destroy(x, true);
817}
818
819static inline void xfrm_state_hold(struct xfrm_state *x)
820{
821 refcount_inc(&x->refcnt);
822}
823
824static inline bool addr_match(const void *token1, const void *token2,
825 unsigned int prefixlen)
826{
827 const __be32 *a1 = token1;
828 const __be32 *a2 = token2;
829 unsigned int pdw;
830 unsigned int pbi;
831
832 pdw = prefixlen >> 5; /* num of whole u32 in prefix */
833 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
834
835 if (pdw)
836 if (memcmp(a1, a2, pdw << 2))
837 return false;
838
839 if (pbi) {
840 __be32 mask;
841
842 mask = htonl((0xffffffff) << (32 - pbi));
843
844 if ((a1[pdw] ^ a2[pdw]) & mask)
845 return false;
846 }
847
848 return true;
849}
850
851static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen)
852{
853 /* C99 6.5.7 (3): u32 << 32 is undefined behaviour */
854 if (sizeof(long) == 4 && prefixlen == 0)
855 return true;
856 return !((a1 ^ a2) & htonl(~0UL << (32 - prefixlen)));
857}
858
859static __inline__
860__be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli)
861{
862 __be16 port;
863 switch(fl->flowi_proto) {
864 case IPPROTO_TCP:
865 case IPPROTO_UDP:
866 case IPPROTO_UDPLITE:
867 case IPPROTO_SCTP:
868 port = uli->ports.sport;
869 break;
870 case IPPROTO_ICMP:
871 case IPPROTO_ICMPV6:
872 port = htons(uli->icmpt.type);
873 break;
874 case IPPROTO_MH:
875 port = htons(uli->mht.type);
876 break;
877 case IPPROTO_GRE:
878 port = htons(ntohl(uli->gre_key) >> 16);
879 break;
880 default:
881 port = 0; /*XXX*/
882 }
883 return port;
884}
885
886static __inline__
887__be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli)
888{
889 __be16 port;
890 switch(fl->flowi_proto) {
891 case IPPROTO_TCP:
892 case IPPROTO_UDP:
893 case IPPROTO_UDPLITE:
894 case IPPROTO_SCTP:
895 port = uli->ports.dport;
896 break;
897 case IPPROTO_ICMP:
898 case IPPROTO_ICMPV6:
899 port = htons(uli->icmpt.code);
900 break;
901 case IPPROTO_GRE:
902 port = htons(ntohl(uli->gre_key) & 0xffff);
903 break;
904 default:
905 port = 0; /*XXX*/
906 }
907 return port;
908}
909
910bool xfrm_selector_match(const struct xfrm_selector *sel,
911 const struct flowi *fl, unsigned short family);
912
913#ifdef CONFIG_SECURITY_NETWORK_XFRM
914/* If neither has a context --> match
915 * Otherwise, both must have a context and the sids, doi, alg must match
916 */
917static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
918{
919 return ((!s1 && !s2) ||
920 (s1 && s2 &&
921 (s1->ctx_sid == s2->ctx_sid) &&
922 (s1->ctx_doi == s2->ctx_doi) &&
923 (s1->ctx_alg == s2->ctx_alg)));
924}
925#else
926static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
927{
928 return true;
929}
930#endif
931
932/* A struct encoding bundle of transformations to apply to some set of flow.
933 *
934 * xdst->child points to the next element of bundle.
935 * dst->xfrm points to an instanse of transformer.
936 *
937 * Due to unfortunate limitations of current routing cache, which we
938 * have no time to fix, it mirrors struct rtable and bound to the same
939 * routing key, including saddr,daddr. However, we can have many of
940 * bundles differing by session id. All the bundles grow from a parent
941 * policy rule.
942 */
943struct xfrm_dst {
944 union {
945 struct dst_entry dst;
946 struct rtable rt;
947 struct rt6_info rt6;
948 } u;
949 struct dst_entry *route;
950 struct dst_entry *child;
951 struct dst_entry *path;
952 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
953 int num_pols, num_xfrms;
954 u32 xfrm_genid;
955 u32 policy_genid;
956 u32 route_mtu_cached;
957 u32 child_mtu_cached;
958 u32 route_cookie;
959 u32 path_cookie;
960};
961
962static inline struct dst_entry *xfrm_dst_path(const struct dst_entry *dst)
963{
964#ifdef CONFIG_XFRM
965 if (dst->xfrm || (dst->flags & DST_XFRM_QUEUE)) {
966 const struct xfrm_dst *xdst = (const struct xfrm_dst *) dst;
967
968 return xdst->path;
969 }
970#endif
971 return (struct dst_entry *) dst;
972}
973
974static inline struct dst_entry *xfrm_dst_child(const struct dst_entry *dst)
975{
976#ifdef CONFIG_XFRM
977 if (dst->xfrm || (dst->flags & DST_XFRM_QUEUE)) {
978 struct xfrm_dst *xdst = (struct xfrm_dst *) dst;
979 return xdst->child;
980 }
981#endif
982 return NULL;
983}
984
985#ifdef CONFIG_XFRM
986static inline void xfrm_dst_set_child(struct xfrm_dst *xdst, struct dst_entry *child)
987{
988 xdst->child = child;
989}
990
991static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
992{
993 xfrm_pols_put(xdst->pols, xdst->num_pols);
994 dst_release(xdst->route);
995 if (likely(xdst->u.dst.xfrm))
996 xfrm_state_put(xdst->u.dst.xfrm);
997}
998#endif
999
1000void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
1001
1002struct xfrm_if_parms {
1003 int link; /* ifindex of underlying L2 interface */
1004 u32 if_id; /* interface identifyer */
1005 bool collect_md;
1006};
1007
1008struct xfrm_if {
1009 struct xfrm_if __rcu *next; /* next interface in list */
1010 struct net_device *dev; /* virtual device associated with interface */
1011 struct net *net; /* netns for packet i/o */
1012 struct xfrm_if_parms p; /* interface parms */
1013
1014 struct gro_cells gro_cells;
1015};
1016
1017struct xfrm_offload {
1018 /* Output sequence number for replay protection on offloading. */
1019 struct {
1020 __u32 low;
1021 __u32 hi;
1022 } seq;
1023
1024 __u32 flags;
1025#define SA_DELETE_REQ 1
1026#define CRYPTO_DONE 2
1027#define CRYPTO_NEXT_DONE 4
1028#define CRYPTO_FALLBACK 8
1029#define XFRM_GSO_SEGMENT 16
1030#define XFRM_GRO 32
1031/* 64 is free */
1032#define XFRM_DEV_RESUME 128
1033#define XFRM_XMIT 256
1034
1035 __u32 status;
1036#define CRYPTO_SUCCESS 1
1037#define CRYPTO_GENERIC_ERROR 2
1038#define CRYPTO_TRANSPORT_AH_AUTH_FAILED 4
1039#define CRYPTO_TRANSPORT_ESP_AUTH_FAILED 8
1040#define CRYPTO_TUNNEL_AH_AUTH_FAILED 16
1041#define CRYPTO_TUNNEL_ESP_AUTH_FAILED 32
1042#define CRYPTO_INVALID_PACKET_SYNTAX 64
1043#define CRYPTO_INVALID_PROTOCOL 128
1044
1045 __u8 proto;
1046 __u8 inner_ipproto;
1047};
1048
1049struct sec_path {
1050 int len;
1051 int olen;
1052
1053 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
1054 struct xfrm_offload ovec[XFRM_MAX_OFFLOAD_DEPTH];
1055};
1056
1057struct sec_path *secpath_set(struct sk_buff *skb);
1058
1059static inline void
1060secpath_reset(struct sk_buff *skb)
1061{
1062#ifdef CONFIG_XFRM
1063 skb_ext_del(skb, SKB_EXT_SEC_PATH);
1064#endif
1065}
1066
1067static inline int
1068xfrm_addr_any(const xfrm_address_t *addr, unsigned short family)
1069{
1070 switch (family) {
1071 case AF_INET:
1072 return addr->a4 == 0;
1073 case AF_INET6:
1074 return ipv6_addr_any(&addr->in6);
1075 }
1076 return 0;
1077}
1078
1079static inline int
1080__xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1081{
1082 return (tmpl->saddr.a4 &&
1083 tmpl->saddr.a4 != x->props.saddr.a4);
1084}
1085
1086static inline int
1087__xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1088{
1089 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
1090 !ipv6_addr_equal((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
1091}
1092
1093static inline int
1094xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family)
1095{
1096 switch (family) {
1097 case AF_INET:
1098 return __xfrm4_state_addr_cmp(tmpl, x);
1099 case AF_INET6:
1100 return __xfrm6_state_addr_cmp(tmpl, x);
1101 }
1102 return !0;
1103}
1104
1105#ifdef CONFIG_XFRM
1106static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1107{
1108 struct sec_path *sp = skb_sec_path(skb);
1109
1110 return sp->xvec[sp->len - 1];
1111}
1112#endif
1113
1114static inline struct xfrm_offload *xfrm_offload(struct sk_buff *skb)
1115{
1116#ifdef CONFIG_XFRM
1117 struct sec_path *sp = skb_sec_path(skb);
1118
1119 if (!sp || !sp->olen || sp->len != sp->olen)
1120 return NULL;
1121
1122 return &sp->ovec[sp->olen - 1];
1123#else
1124 return NULL;
1125#endif
1126}
1127
1128#ifdef CONFIG_XFRM
1129int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb,
1130 unsigned short family);
1131
1132static inline bool __xfrm_check_nopolicy(struct net *net, struct sk_buff *skb,
1133 int dir)
1134{
1135 if (!net->xfrm.policy_count[dir] && !secpath_exists(skb))
1136 return net->xfrm.policy_default[dir] == XFRM_USERPOLICY_ACCEPT;
1137
1138 return false;
1139}
1140
1141static inline bool __xfrm_check_dev_nopolicy(struct sk_buff *skb,
1142 int dir, unsigned short family)
1143{
1144 if (dir != XFRM_POLICY_OUT && family == AF_INET) {
1145 /* same dst may be used for traffic originating from
1146 * devices with different policy settings.
1147 */
1148 return IPCB(skb)->flags & IPSKB_NOPOLICY;
1149 }
1150 return skb_dst(skb) && (skb_dst(skb)->flags & DST_NOPOLICY);
1151}
1152
1153static inline int __xfrm_policy_check2(struct sock *sk, int dir,
1154 struct sk_buff *skb,
1155 unsigned int family, int reverse)
1156{
1157 struct net *net = dev_net(skb->dev);
1158 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
1159 struct xfrm_offload *xo = xfrm_offload(skb);
1160 struct xfrm_state *x;
1161
1162 if (sk && sk->sk_policy[XFRM_POLICY_IN])
1163 return __xfrm_policy_check(sk, ndir, skb, family);
1164
1165 if (xo) {
1166 x = xfrm_input_state(skb);
1167 if (x->xso.type == XFRM_DEV_OFFLOAD_PACKET)
1168 return (xo->flags & CRYPTO_DONE) &&
1169 (xo->status & CRYPTO_SUCCESS);
1170 }
1171
1172 return __xfrm_check_nopolicy(net, skb, dir) ||
1173 __xfrm_check_dev_nopolicy(skb, dir, family) ||
1174 __xfrm_policy_check(sk, ndir, skb, family);
1175}
1176
1177static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1178{
1179 return __xfrm_policy_check2(sk, dir, skb, family, 0);
1180}
1181
1182static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1183{
1184 return xfrm_policy_check(sk, dir, skb, AF_INET);
1185}
1186
1187static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1188{
1189 return xfrm_policy_check(sk, dir, skb, AF_INET6);
1190}
1191
1192static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1193 struct sk_buff *skb)
1194{
1195 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1196}
1197
1198static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1199 struct sk_buff *skb)
1200{
1201 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1202}
1203
1204int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1205 unsigned int family, int reverse);
1206
1207static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1208 unsigned int family)
1209{
1210 return __xfrm_decode_session(skb, fl, family, 0);
1211}
1212
1213static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1214 struct flowi *fl,
1215 unsigned int family)
1216{
1217 return __xfrm_decode_session(skb, fl, family, 1);
1218}
1219
1220int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1221
1222static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1223{
1224 struct net *net = dev_net(skb->dev);
1225
1226 if (!net->xfrm.policy_count[XFRM_POLICY_OUT] &&
1227 net->xfrm.policy_default[XFRM_POLICY_OUT] == XFRM_USERPOLICY_ACCEPT)
1228 return true;
1229
1230 return (skb_dst(skb)->flags & DST_NOXFRM) ||
1231 __xfrm_route_forward(skb, family);
1232}
1233
1234static inline int xfrm4_route_forward(struct sk_buff *skb)
1235{
1236 return xfrm_route_forward(skb, AF_INET);
1237}
1238
1239static inline int xfrm6_route_forward(struct sk_buff *skb)
1240{
1241 return xfrm_route_forward(skb, AF_INET6);
1242}
1243
1244int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk);
1245
1246static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk)
1247{
1248 if (!sk_fullsock(osk))
1249 return 0;
1250 sk->sk_policy[0] = NULL;
1251 sk->sk_policy[1] = NULL;
1252 if (unlikely(osk->sk_policy[0] || osk->sk_policy[1]))
1253 return __xfrm_sk_clone_policy(sk, osk);
1254 return 0;
1255}
1256
1257int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1258
1259static inline void xfrm_sk_free_policy(struct sock *sk)
1260{
1261 struct xfrm_policy *pol;
1262
1263 pol = rcu_dereference_protected(sk->sk_policy[0], 1);
1264 if (unlikely(pol != NULL)) {
1265 xfrm_policy_delete(pol, XFRM_POLICY_MAX);
1266 sk->sk_policy[0] = NULL;
1267 }
1268 pol = rcu_dereference_protected(sk->sk_policy[1], 1);
1269 if (unlikely(pol != NULL)) {
1270 xfrm_policy_delete(pol, XFRM_POLICY_MAX+1);
1271 sk->sk_policy[1] = NULL;
1272 }
1273}
1274
1275#else
1276
1277static inline void xfrm_sk_free_policy(struct sock *sk) {}
1278static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) { return 0; }
1279static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1280static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1281static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1282{
1283 return 1;
1284}
1285static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1286{
1287 return 1;
1288}
1289static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1290{
1291 return 1;
1292}
1293static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1294 struct flowi *fl,
1295 unsigned int family)
1296{
1297 return -ENOSYS;
1298}
1299static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1300 struct sk_buff *skb)
1301{
1302 return 1;
1303}
1304static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1305 struct sk_buff *skb)
1306{
1307 return 1;
1308}
1309#endif
1310
1311static __inline__
1312xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family)
1313{
1314 switch (family){
1315 case AF_INET:
1316 return (xfrm_address_t *)&fl->u.ip4.daddr;
1317 case AF_INET6:
1318 return (xfrm_address_t *)&fl->u.ip6.daddr;
1319 }
1320 return NULL;
1321}
1322
1323static __inline__
1324xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family)
1325{
1326 switch (family){
1327 case AF_INET:
1328 return (xfrm_address_t *)&fl->u.ip4.saddr;
1329 case AF_INET6:
1330 return (xfrm_address_t *)&fl->u.ip6.saddr;
1331 }
1332 return NULL;
1333}
1334
1335static __inline__
1336void xfrm_flowi_addr_get(const struct flowi *fl,
1337 xfrm_address_t *saddr, xfrm_address_t *daddr,
1338 unsigned short family)
1339{
1340 switch(family) {
1341 case AF_INET:
1342 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4));
1343 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4));
1344 break;
1345 case AF_INET6:
1346 saddr->in6 = fl->u.ip6.saddr;
1347 daddr->in6 = fl->u.ip6.daddr;
1348 break;
1349 }
1350}
1351
1352static __inline__ int
1353__xfrm4_state_addr_check(const struct xfrm_state *x,
1354 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1355{
1356 if (daddr->a4 == x->id.daddr.a4 &&
1357 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1358 return 1;
1359 return 0;
1360}
1361
1362static __inline__ int
1363__xfrm6_state_addr_check(const struct xfrm_state *x,
1364 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1365{
1366 if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1367 (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) ||
1368 ipv6_addr_any((struct in6_addr *)saddr) ||
1369 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1370 return 1;
1371 return 0;
1372}
1373
1374static __inline__ int
1375xfrm_state_addr_check(const struct xfrm_state *x,
1376 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1377 unsigned short family)
1378{
1379 switch (family) {
1380 case AF_INET:
1381 return __xfrm4_state_addr_check(x, daddr, saddr);
1382 case AF_INET6:
1383 return __xfrm6_state_addr_check(x, daddr, saddr);
1384 }
1385 return 0;
1386}
1387
1388static __inline__ int
1389xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl,
1390 unsigned short family)
1391{
1392 switch (family) {
1393 case AF_INET:
1394 return __xfrm4_state_addr_check(x,
1395 (const xfrm_address_t *)&fl->u.ip4.daddr,
1396 (const xfrm_address_t *)&fl->u.ip4.saddr);
1397 case AF_INET6:
1398 return __xfrm6_state_addr_check(x,
1399 (const xfrm_address_t *)&fl->u.ip6.daddr,
1400 (const xfrm_address_t *)&fl->u.ip6.saddr);
1401 }
1402 return 0;
1403}
1404
1405static inline int xfrm_state_kern(const struct xfrm_state *x)
1406{
1407 return atomic_read(&x->tunnel_users);
1408}
1409
1410static inline bool xfrm_id_proto_valid(u8 proto)
1411{
1412 switch (proto) {
1413 case IPPROTO_AH:
1414 case IPPROTO_ESP:
1415 case IPPROTO_COMP:
1416#if IS_ENABLED(CONFIG_IPV6)
1417 case IPPROTO_ROUTING:
1418 case IPPROTO_DSTOPTS:
1419#endif
1420 return true;
1421 default:
1422 return false;
1423 }
1424}
1425
1426/* IPSEC_PROTO_ANY only matches 3 IPsec protocols, 0 could match all. */
1427static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1428{
1429 return (!userproto || proto == userproto ||
1430 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1431 proto == IPPROTO_ESP ||
1432 proto == IPPROTO_COMP)));
1433}
1434
1435/*
1436 * xfrm algorithm information
1437 */
1438struct xfrm_algo_aead_info {
1439 char *geniv;
1440 u16 icv_truncbits;
1441};
1442
1443struct xfrm_algo_auth_info {
1444 u16 icv_truncbits;
1445 u16 icv_fullbits;
1446};
1447
1448struct xfrm_algo_encr_info {
1449 char *geniv;
1450 u16 blockbits;
1451 u16 defkeybits;
1452};
1453
1454struct xfrm_algo_comp_info {
1455 u16 threshold;
1456};
1457
1458struct xfrm_algo_desc {
1459 char *name;
1460 char *compat;
1461 u8 available:1;
1462 u8 pfkey_supported:1;
1463 union {
1464 struct xfrm_algo_aead_info aead;
1465 struct xfrm_algo_auth_info auth;
1466 struct xfrm_algo_encr_info encr;
1467 struct xfrm_algo_comp_info comp;
1468 } uinfo;
1469 struct sadb_alg desc;
1470};
1471
1472/* XFRM protocol handlers. */
1473struct xfrm4_protocol {
1474 int (*handler)(struct sk_buff *skb);
1475 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1476 int encap_type);
1477 int (*cb_handler)(struct sk_buff *skb, int err);
1478 int (*err_handler)(struct sk_buff *skb, u32 info);
1479
1480 struct xfrm4_protocol __rcu *next;
1481 int priority;
1482};
1483
1484struct xfrm6_protocol {
1485 int (*handler)(struct sk_buff *skb);
1486 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1487 int encap_type);
1488 int (*cb_handler)(struct sk_buff *skb, int err);
1489 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1490 u8 type, u8 code, int offset, __be32 info);
1491
1492 struct xfrm6_protocol __rcu *next;
1493 int priority;
1494};
1495
1496/* XFRM tunnel handlers. */
1497struct xfrm_tunnel {
1498 int (*handler)(struct sk_buff *skb);
1499 int (*cb_handler)(struct sk_buff *skb, int err);
1500 int (*err_handler)(struct sk_buff *skb, u32 info);
1501
1502 struct xfrm_tunnel __rcu *next;
1503 int priority;
1504};
1505
1506struct xfrm6_tunnel {
1507 int (*handler)(struct sk_buff *skb);
1508 int (*cb_handler)(struct sk_buff *skb, int err);
1509 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1510 u8 type, u8 code, int offset, __be32 info);
1511 struct xfrm6_tunnel __rcu *next;
1512 int priority;
1513};
1514
1515void xfrm_init(void);
1516void xfrm4_init(void);
1517int xfrm_state_init(struct net *net);
1518void xfrm_state_fini(struct net *net);
1519void xfrm4_state_init(void);
1520void xfrm4_protocol_init(void);
1521#ifdef CONFIG_XFRM
1522int xfrm6_init(void);
1523void xfrm6_fini(void);
1524int xfrm6_state_init(void);
1525void xfrm6_state_fini(void);
1526int xfrm6_protocol_init(void);
1527void xfrm6_protocol_fini(void);
1528#else
1529static inline int xfrm6_init(void)
1530{
1531 return 0;
1532}
1533static inline void xfrm6_fini(void)
1534{
1535 ;
1536}
1537#endif
1538
1539#ifdef CONFIG_XFRM_STATISTICS
1540int xfrm_proc_init(struct net *net);
1541void xfrm_proc_fini(struct net *net);
1542#endif
1543
1544int xfrm_sysctl_init(struct net *net);
1545#ifdef CONFIG_SYSCTL
1546void xfrm_sysctl_fini(struct net *net);
1547#else
1548static inline void xfrm_sysctl_fini(struct net *net)
1549{
1550}
1551#endif
1552
1553void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
1554 struct xfrm_address_filter *filter);
1555int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1556 int (*func)(struct xfrm_state *, int, void*), void *);
1557void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net);
1558struct xfrm_state *xfrm_state_alloc(struct net *net);
1559void xfrm_state_free(struct xfrm_state *x);
1560struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr,
1561 const xfrm_address_t *saddr,
1562 const struct flowi *fl,
1563 struct xfrm_tmpl *tmpl,
1564 struct xfrm_policy *pol, int *err,
1565 unsigned short family, u32 if_id);
1566struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark, u32 if_id,
1567 xfrm_address_t *daddr,
1568 xfrm_address_t *saddr,
1569 unsigned short family,
1570 u8 mode, u8 proto, u32 reqid);
1571struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
1572 unsigned short family);
1573int xfrm_state_check_expire(struct xfrm_state *x);
1574#ifdef CONFIG_XFRM_OFFLOAD
1575static inline void xfrm_dev_state_update_curlft(struct xfrm_state *x)
1576{
1577 struct xfrm_dev_offload *xdo = &x->xso;
1578 struct net_device *dev = xdo->dev;
1579
1580 if (x->xso.type != XFRM_DEV_OFFLOAD_PACKET)
1581 return;
1582
1583 if (dev && dev->xfrmdev_ops &&
1584 dev->xfrmdev_ops->xdo_dev_state_update_curlft)
1585 dev->xfrmdev_ops->xdo_dev_state_update_curlft(x);
1586
1587}
1588#else
1589static inline void xfrm_dev_state_update_curlft(struct xfrm_state *x) {}
1590#endif
1591void xfrm_state_insert(struct xfrm_state *x);
1592int xfrm_state_add(struct xfrm_state *x);
1593int xfrm_state_update(struct xfrm_state *x);
1594struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1595 const xfrm_address_t *daddr, __be32 spi,
1596 u8 proto, unsigned short family);
1597struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1598 const xfrm_address_t *daddr,
1599 const xfrm_address_t *saddr,
1600 u8 proto,
1601 unsigned short family);
1602#ifdef CONFIG_XFRM_SUB_POLICY
1603void xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1604 unsigned short family);
1605void xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1606 unsigned short family);
1607#else
1608static inline void xfrm_tmpl_sort(struct xfrm_tmpl **d, struct xfrm_tmpl **s,
1609 int n, unsigned short family)
1610{
1611}
1612
1613static inline void xfrm_state_sort(struct xfrm_state **d, struct xfrm_state **s,
1614 int n, unsigned short family)
1615{
1616}
1617#endif
1618
1619struct xfrmk_sadinfo {
1620 u32 sadhcnt; /* current hash bkts */
1621 u32 sadhmcnt; /* max allowed hash bkts */
1622 u32 sadcnt; /* current running count */
1623};
1624
1625struct xfrmk_spdinfo {
1626 u32 incnt;
1627 u32 outcnt;
1628 u32 fwdcnt;
1629 u32 inscnt;
1630 u32 outscnt;
1631 u32 fwdscnt;
1632 u32 spdhcnt;
1633 u32 spdhmcnt;
1634};
1635
1636struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1637int xfrm_state_delete(struct xfrm_state *x);
1638int xfrm_state_flush(struct net *net, u8 proto, bool task_valid, bool sync);
1639int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid);
1640int xfrm_dev_policy_flush(struct net *net, struct net_device *dev,
1641 bool task_valid);
1642void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1643void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1644u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq);
1645int xfrm_init_replay(struct xfrm_state *x, struct netlink_ext_ack *extack);
1646u32 xfrm_state_mtu(struct xfrm_state *x, int mtu);
1647int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload,
1648 struct netlink_ext_ack *extack);
1649int xfrm_init_state(struct xfrm_state *x);
1650int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type);
1651int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1652int xfrm_trans_queue_net(struct net *net, struct sk_buff *skb,
1653 int (*finish)(struct net *, struct sock *,
1654 struct sk_buff *));
1655int xfrm_trans_queue(struct sk_buff *skb,
1656 int (*finish)(struct net *, struct sock *,
1657 struct sk_buff *));
1658int xfrm_output_resume(struct sock *sk, struct sk_buff *skb, int err);
1659int xfrm_output(struct sock *sk, struct sk_buff *skb);
1660
1661#if IS_ENABLED(CONFIG_NET_PKTGEN)
1662int pktgen_xfrm_outer_mode_output(struct xfrm_state *x, struct sk_buff *skb);
1663#endif
1664
1665void xfrm_local_error(struct sk_buff *skb, int mtu);
1666int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1667int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1668 int encap_type);
1669int xfrm4_transport_finish(struct sk_buff *skb, int async);
1670int xfrm4_rcv(struct sk_buff *skb);
1671
1672static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1673{
1674 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
1675 XFRM_SPI_SKB_CB(skb)->family = AF_INET;
1676 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
1677 return xfrm_input(skb, nexthdr, spi, 0);
1678}
1679
1680int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1681int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol);
1682int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol);
1683int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1684int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1685void xfrm4_local_error(struct sk_buff *skb, u32 mtu);
1686int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1687int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi,
1688 struct ip6_tnl *t);
1689int xfrm6_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1690 int encap_type);
1691int xfrm6_transport_finish(struct sk_buff *skb, int async);
1692int xfrm6_rcv_tnl(struct sk_buff *skb, struct ip6_tnl *t);
1693int xfrm6_rcv(struct sk_buff *skb);
1694int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1695 xfrm_address_t *saddr, u8 proto);
1696void xfrm6_local_error(struct sk_buff *skb, u32 mtu);
1697int xfrm6_protocol_register(struct xfrm6_protocol *handler, unsigned char protocol);
1698int xfrm6_protocol_deregister(struct xfrm6_protocol *handler, unsigned char protocol);
1699int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1700int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1701__be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1702__be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr);
1703int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1704
1705#ifdef CONFIG_XFRM
1706void xfrm6_local_rxpmtu(struct sk_buff *skb, u32 mtu);
1707int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1708int xfrm6_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1709int xfrm_user_policy(struct sock *sk, int optname, sockptr_t optval,
1710 int optlen);
1711#else
1712static inline int xfrm_user_policy(struct sock *sk, int optname,
1713 sockptr_t optval, int optlen)
1714{
1715 return -ENOPROTOOPT;
1716}
1717#endif
1718
1719struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, int oif,
1720 const xfrm_address_t *saddr,
1721 const xfrm_address_t *daddr,
1722 int family, u32 mark);
1723
1724struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1725
1726void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1727int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1728 int (*func)(struct xfrm_policy *, int, int, void*),
1729 void *);
1730void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net);
1731int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1732struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net,
1733 const struct xfrm_mark *mark,
1734 u32 if_id, u8 type, int dir,
1735 struct xfrm_selector *sel,
1736 struct xfrm_sec_ctx *ctx, int delete,
1737 int *err);
1738struct xfrm_policy *xfrm_policy_byid(struct net *net,
1739 const struct xfrm_mark *mark, u32 if_id,
1740 u8 type, int dir, u32 id, int delete,
1741 int *err);
1742int xfrm_policy_flush(struct net *net, u8 type, bool task_valid);
1743void xfrm_policy_hash_rebuild(struct net *net);
1744u32 xfrm_get_acqseq(void);
1745int verify_spi_info(u8 proto, u32 min, u32 max, struct netlink_ext_ack *extack);
1746int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi,
1747 struct netlink_ext_ack *extack);
1748struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark,
1749 u8 mode, u32 reqid, u32 if_id, u8 proto,
1750 const xfrm_address_t *daddr,
1751 const xfrm_address_t *saddr, int create,
1752 unsigned short family);
1753int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1754
1755#ifdef CONFIG_XFRM_MIGRATE
1756int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1757 const struct xfrm_migrate *m, int num_bundles,
1758 const struct xfrm_kmaddress *k,
1759 const struct xfrm_encap_tmpl *encap);
1760struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net,
1761 u32 if_id);
1762struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1763 struct xfrm_migrate *m,
1764 struct xfrm_encap_tmpl *encap);
1765int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1766 struct xfrm_migrate *m, int num_bundles,
1767 struct xfrm_kmaddress *k, struct net *net,
1768 struct xfrm_encap_tmpl *encap, u32 if_id,
1769 struct netlink_ext_ack *extack);
1770#endif
1771
1772int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1773void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid);
1774int km_report(struct net *net, u8 proto, struct xfrm_selector *sel,
1775 xfrm_address_t *addr);
1776
1777void xfrm_input_init(void);
1778int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1779
1780void xfrm_probe_algs(void);
1781int xfrm_count_pfkey_auth_supported(void);
1782int xfrm_count_pfkey_enc_supported(void);
1783struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1784struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1785struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1786struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1787struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1788struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe);
1789struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe);
1790struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe);
1791struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len,
1792 int probe);
1793
1794static inline bool xfrm6_addr_equal(const xfrm_address_t *a,
1795 const xfrm_address_t *b)
1796{
1797 return ipv6_addr_equal((const struct in6_addr *)a,
1798 (const struct in6_addr *)b);
1799}
1800
1801static inline bool xfrm_addr_equal(const xfrm_address_t *a,
1802 const xfrm_address_t *b,
1803 sa_family_t family)
1804{
1805 switch (family) {
1806 default:
1807 case AF_INET:
1808 return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0;
1809 case AF_INET6:
1810 return xfrm6_addr_equal(a, b);
1811 }
1812}
1813
1814static inline int xfrm_policy_id2dir(u32 index)
1815{
1816 return index & 7;
1817}
1818
1819#ifdef CONFIG_XFRM
1820void xfrm_replay_advance(struct xfrm_state *x, __be32 net_seq);
1821int xfrm_replay_check(struct xfrm_state *x, struct sk_buff *skb, __be32 net_seq);
1822void xfrm_replay_notify(struct xfrm_state *x, int event);
1823int xfrm_replay_overflow(struct xfrm_state *x, struct sk_buff *skb);
1824int xfrm_replay_recheck(struct xfrm_state *x, struct sk_buff *skb, __be32 net_seq);
1825
1826static inline int xfrm_aevent_is_on(struct net *net)
1827{
1828 struct sock *nlsk;
1829 int ret = 0;
1830
1831 rcu_read_lock();
1832 nlsk = rcu_dereference(net->xfrm.nlsk);
1833 if (nlsk)
1834 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1835 rcu_read_unlock();
1836 return ret;
1837}
1838
1839static inline int xfrm_acquire_is_on(struct net *net)
1840{
1841 struct sock *nlsk;
1842 int ret = 0;
1843
1844 rcu_read_lock();
1845 nlsk = rcu_dereference(net->xfrm.nlsk);
1846 if (nlsk)
1847 ret = netlink_has_listeners(nlsk, XFRMNLGRP_ACQUIRE);
1848 rcu_read_unlock();
1849
1850 return ret;
1851}
1852#endif
1853
1854static inline unsigned int aead_len(struct xfrm_algo_aead *alg)
1855{
1856 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1857}
1858
1859static inline unsigned int xfrm_alg_len(const struct xfrm_algo *alg)
1860{
1861 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1862}
1863
1864static inline unsigned int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg)
1865{
1866 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1867}
1868
1869static inline unsigned int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn)
1870{
1871 return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32);
1872}
1873
1874#ifdef CONFIG_XFRM_MIGRATE
1875static inline int xfrm_replay_clone(struct xfrm_state *x,
1876 struct xfrm_state *orig)
1877{
1878
1879 x->replay_esn = kmemdup(orig->replay_esn,
1880 xfrm_replay_state_esn_len(orig->replay_esn),
1881 GFP_KERNEL);
1882 if (!x->replay_esn)
1883 return -ENOMEM;
1884 x->preplay_esn = kmemdup(orig->preplay_esn,
1885 xfrm_replay_state_esn_len(orig->preplay_esn),
1886 GFP_KERNEL);
1887 if (!x->preplay_esn)
1888 return -ENOMEM;
1889
1890 return 0;
1891}
1892
1893static inline struct xfrm_algo_aead *xfrm_algo_aead_clone(struct xfrm_algo_aead *orig)
1894{
1895 return kmemdup(orig, aead_len(orig), GFP_KERNEL);
1896}
1897
1898
1899static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1900{
1901 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1902}
1903
1904static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1905{
1906 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1907}
1908
1909static inline void xfrm_states_put(struct xfrm_state **states, int n)
1910{
1911 int i;
1912 for (i = 0; i < n; i++)
1913 xfrm_state_put(*(states + i));
1914}
1915
1916static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1917{
1918 int i;
1919 for (i = 0; i < n; i++)
1920 xfrm_state_delete(*(states + i));
1921}
1922#endif
1923
1924void __init xfrm_dev_init(void);
1925
1926#ifdef CONFIG_XFRM_OFFLOAD
1927void xfrm_dev_resume(struct sk_buff *skb);
1928void xfrm_dev_backlog(struct softnet_data *sd);
1929struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again);
1930int xfrm_dev_state_add(struct net *net, struct xfrm_state *x,
1931 struct xfrm_user_offload *xuo,
1932 struct netlink_ext_ack *extack);
1933int xfrm_dev_policy_add(struct net *net, struct xfrm_policy *xp,
1934 struct xfrm_user_offload *xuo, u8 dir,
1935 struct netlink_ext_ack *extack);
1936bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x);
1937
1938static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
1939{
1940 struct xfrm_dev_offload *xso = &x->xso;
1941
1942 if (xso->dev && xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn)
1943 xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn(x);
1944}
1945
1946static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
1947{
1948 struct xfrm_state *x = dst->xfrm;
1949 struct xfrm_dst *xdst;
1950
1951 if (!x || !x->type_offload)
1952 return false;
1953
1954 xdst = (struct xfrm_dst *) dst;
1955 if (!x->xso.offload_handle && !xdst->child->xfrm)
1956 return true;
1957 if (x->xso.offload_handle && (x->xso.dev == xfrm_dst_path(dst)->dev) &&
1958 !xdst->child->xfrm)
1959 return true;
1960
1961 return false;
1962}
1963
1964static inline void xfrm_dev_state_delete(struct xfrm_state *x)
1965{
1966 struct xfrm_dev_offload *xso = &x->xso;
1967
1968 if (xso->dev)
1969 xso->dev->xfrmdev_ops->xdo_dev_state_delete(x);
1970}
1971
1972static inline void xfrm_dev_state_free(struct xfrm_state *x)
1973{
1974 struct xfrm_dev_offload *xso = &x->xso;
1975 struct net_device *dev = xso->dev;
1976
1977 if (dev && dev->xfrmdev_ops) {
1978 if (dev->xfrmdev_ops->xdo_dev_state_free)
1979 dev->xfrmdev_ops->xdo_dev_state_free(x);
1980 xso->dev = NULL;
1981 netdev_put(dev, &xso->dev_tracker);
1982 }
1983}
1984
1985static inline void xfrm_dev_policy_delete(struct xfrm_policy *x)
1986{
1987 struct xfrm_dev_offload *xdo = &x->xdo;
1988 struct net_device *dev = xdo->dev;
1989
1990 if (dev && dev->xfrmdev_ops && dev->xfrmdev_ops->xdo_dev_policy_delete)
1991 dev->xfrmdev_ops->xdo_dev_policy_delete(x);
1992}
1993
1994static inline void xfrm_dev_policy_free(struct xfrm_policy *x)
1995{
1996 struct xfrm_dev_offload *xdo = &x->xdo;
1997 struct net_device *dev = xdo->dev;
1998
1999 if (dev && dev->xfrmdev_ops) {
2000 if (dev->xfrmdev_ops->xdo_dev_policy_free)
2001 dev->xfrmdev_ops->xdo_dev_policy_free(x);
2002 xdo->dev = NULL;
2003 netdev_put(dev, &xdo->dev_tracker);
2004 }
2005}
2006#else
2007static inline void xfrm_dev_resume(struct sk_buff *skb)
2008{
2009}
2010
2011static inline void xfrm_dev_backlog(struct softnet_data *sd)
2012{
2013}
2014
2015static inline struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again)
2016{
2017 return skb;
2018}
2019
2020static inline int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, struct xfrm_user_offload *xuo, struct netlink_ext_ack *extack)
2021{
2022 return 0;
2023}
2024
2025static inline void xfrm_dev_state_delete(struct xfrm_state *x)
2026{
2027}
2028
2029static inline void xfrm_dev_state_free(struct xfrm_state *x)
2030{
2031}
2032
2033static inline int xfrm_dev_policy_add(struct net *net, struct xfrm_policy *xp,
2034 struct xfrm_user_offload *xuo, u8 dir,
2035 struct netlink_ext_ack *extack)
2036{
2037 return 0;
2038}
2039
2040static inline void xfrm_dev_policy_delete(struct xfrm_policy *x)
2041{
2042}
2043
2044static inline void xfrm_dev_policy_free(struct xfrm_policy *x)
2045{
2046}
2047
2048static inline bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x)
2049{
2050 return false;
2051}
2052
2053static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
2054{
2055}
2056
2057static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
2058{
2059 return false;
2060}
2061#endif
2062
2063static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
2064{
2065 if (attrs[XFRMA_MARK])
2066 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark));
2067 else
2068 m->v = m->m = 0;
2069
2070 return m->v & m->m;
2071}
2072
2073static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m)
2074{
2075 int ret = 0;
2076
2077 if (m->m | m->v)
2078 ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
2079 return ret;
2080}
2081
2082static inline __u32 xfrm_smark_get(__u32 mark, struct xfrm_state *x)
2083{
2084 struct xfrm_mark *m = &x->props.smark;
2085
2086 return (m->v & m->m) | (mark & ~m->m);
2087}
2088
2089static inline int xfrm_if_id_put(struct sk_buff *skb, __u32 if_id)
2090{
2091 int ret = 0;
2092
2093 if (if_id)
2094 ret = nla_put_u32(skb, XFRMA_IF_ID, if_id);
2095 return ret;
2096}
2097
2098static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x,
2099 unsigned int family)
2100{
2101 bool tunnel = false;
2102
2103 switch(family) {
2104 case AF_INET:
2105 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4)
2106 tunnel = true;
2107 break;
2108 case AF_INET6:
2109 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6)
2110 tunnel = true;
2111 break;
2112 }
2113 if (tunnel && !(x->outer_mode.flags & XFRM_MODE_FLAG_TUNNEL))
2114 return -EINVAL;
2115
2116 return 0;
2117}
2118
2119extern const int xfrm_msg_min[XFRM_NR_MSGTYPES];
2120extern const struct nla_policy xfrma_policy[XFRMA_MAX+1];
2121
2122struct xfrm_translator {
2123 /* Allocate frag_list and put compat translation there */
2124 int (*alloc_compat)(struct sk_buff *skb, const struct nlmsghdr *src);
2125
2126 /* Allocate nlmsg with 64-bit translaton of received 32-bit message */
2127 struct nlmsghdr *(*rcv_msg_compat)(const struct nlmsghdr *nlh,
2128 int maxtype, const struct nla_policy *policy,
2129 struct netlink_ext_ack *extack);
2130
2131 /* Translate 32-bit user_policy from sockptr */
2132 int (*xlate_user_policy_sockptr)(u8 **pdata32, int optlen);
2133
2134 struct module *owner;
2135};
2136
2137#if IS_ENABLED(CONFIG_XFRM_USER_COMPAT)
2138extern int xfrm_register_translator(struct xfrm_translator *xtr);
2139extern int xfrm_unregister_translator(struct xfrm_translator *xtr);
2140extern struct xfrm_translator *xfrm_get_translator(void);
2141extern void xfrm_put_translator(struct xfrm_translator *xtr);
2142#else
2143static inline struct xfrm_translator *xfrm_get_translator(void)
2144{
2145 return NULL;
2146}
2147static inline void xfrm_put_translator(struct xfrm_translator *xtr)
2148{
2149}
2150#endif
2151
2152#if IS_ENABLED(CONFIG_IPV6)
2153static inline bool xfrm6_local_dontfrag(const struct sock *sk)
2154{
2155 int proto;
2156
2157 if (!sk || sk->sk_family != AF_INET6)
2158 return false;
2159
2160 proto = sk->sk_protocol;
2161 if (proto == IPPROTO_UDP || proto == IPPROTO_RAW)
2162 return inet6_sk(sk)->dontfrag;
2163
2164 return false;
2165}
2166#endif
2167
2168#if (IS_BUILTIN(CONFIG_XFRM_INTERFACE) && IS_ENABLED(CONFIG_DEBUG_INFO_BTF)) || \
2169 (IS_MODULE(CONFIG_XFRM_INTERFACE) && IS_ENABLED(CONFIG_DEBUG_INFO_BTF_MODULES))
2170
2171extern struct metadata_dst __percpu *xfrm_bpf_md_dst;
2172
2173int register_xfrm_interface_bpf(void);
2174
2175#else
2176
2177static inline int register_xfrm_interface_bpf(void)
2178{
2179 return 0;
2180}
2181
2182#endif
2183
2184#endif /* _NET_XFRM_H */