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1#ifndef _NET_XFRM_H
2#define _NET_XFRM_H
3
4#include <linux/compiler.h>
5#include <linux/xfrm.h>
6#include <linux/spinlock.h>
7#include <linux/list.h>
8#include <linux/skbuff.h>
9#include <linux/socket.h>
10#include <linux/pfkeyv2.h>
11#include <linux/ipsec.h>
12#include <linux/in6.h>
13#include <linux/mutex.h>
14#include <linux/audit.h>
15#include <linux/slab.h>
16
17#include <net/sock.h>
18#include <net/dst.h>
19#include <net/ip.h>
20#include <net/route.h>
21#include <net/ipv6.h>
22#include <net/ip6_fib.h>
23#include <net/flow.h>
24
25#include <linux/interrupt.h>
26
27#ifdef CONFIG_XFRM_STATISTICS
28#include <net/snmp.h>
29#endif
30
31#define XFRM_PROTO_ESP 50
32#define XFRM_PROTO_AH 51
33#define XFRM_PROTO_COMP 108
34#define XFRM_PROTO_IPIP 4
35#define XFRM_PROTO_IPV6 41
36#define XFRM_PROTO_ROUTING IPPROTO_ROUTING
37#define XFRM_PROTO_DSTOPTS IPPROTO_DSTOPTS
38
39#define XFRM_ALIGN4(len) (((len) + 3) & ~3)
40#define XFRM_ALIGN8(len) (((len) + 7) & ~7)
41#define MODULE_ALIAS_XFRM_MODE(family, encap) \
42 MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap))
43#define MODULE_ALIAS_XFRM_TYPE(family, proto) \
44 MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto))
45
46#ifdef CONFIG_XFRM_STATISTICS
47#define XFRM_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.xfrm_statistics, field)
48#define XFRM_INC_STATS_BH(net, field) SNMP_INC_STATS_BH((net)->mib.xfrm_statistics, field)
49#define XFRM_INC_STATS_USER(net, field) SNMP_INC_STATS_USER((net)-mib.xfrm_statistics, field)
50#else
51#define XFRM_INC_STATS(net, field) ((void)(net))
52#define XFRM_INC_STATS_BH(net, field) ((void)(net))
53#define XFRM_INC_STATS_USER(net, field) ((void)(net))
54#endif
55
56extern struct mutex xfrm_cfg_mutex;
57
58/* Organization of SPD aka "XFRM rules"
59 ------------------------------------
60
61 Basic objects:
62 - policy rule, struct xfrm_policy (=SPD entry)
63 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
64 - instance of a transformer, struct xfrm_state (=SA)
65 - template to clone xfrm_state, struct xfrm_tmpl
66
67 SPD is plain linear list of xfrm_policy rules, ordered by priority.
68 (To be compatible with existing pfkeyv2 implementations,
69 many rules with priority of 0x7fffffff are allowed to exist and
70 such rules are ordered in an unpredictable way, thanks to bsd folks.)
71
72 Lookup is plain linear search until the first match with selector.
73
74 If "action" is "block", then we prohibit the flow, otherwise:
75 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
76 policy entry has list of up to XFRM_MAX_DEPTH transformations,
77 described by templates xfrm_tmpl. Each template is resolved
78 to a complete xfrm_state (see below) and we pack bundle of transformations
79 to a dst_entry returned to requestor.
80
81 dst -. xfrm .-> xfrm_state #1
82 |---. child .-> dst -. xfrm .-> xfrm_state #2
83 |---. child .-> dst -. xfrm .-> xfrm_state #3
84 |---. child .-> NULL
85
86 Bundles are cached at xrfm_policy struct (field ->bundles).
87
88
89 Resolution of xrfm_tmpl
90 -----------------------
91 Template contains:
92 1. ->mode Mode: transport or tunnel
93 2. ->id.proto Protocol: AH/ESP/IPCOMP
94 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode.
95 Q: allow to resolve security gateway?
96 4. ->id.spi If not zero, static SPI.
97 5. ->saddr Local tunnel endpoint, ignored for transport mode.
98 6. ->algos List of allowed algos. Plain bitmask now.
99 Q: ealgos, aalgos, calgos. What a mess...
100 7. ->share Sharing mode.
101 Q: how to implement private sharing mode? To add struct sock* to
102 flow id?
103
104 Having this template we search through SAD searching for entries
105 with appropriate mode/proto/algo, permitted by selector.
106 If no appropriate entry found, it is requested from key manager.
107
108 PROBLEMS:
109 Q: How to find all the bundles referring to a physical path for
110 PMTU discovery? Seems, dst should contain list of all parents...
111 and enter to infinite locking hierarchy disaster.
112 No! It is easier, we will not search for them, let them find us.
113 We add genid to each dst plus pointer to genid of raw IP route,
114 pmtu disc will update pmtu on raw IP route and increase its genid.
115 dst_check() will see this for top level and trigger resyncing
116 metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
117 */
118
119struct xfrm_state_walk {
120 struct list_head all;
121 u8 state;
122 union {
123 u8 dying;
124 u8 proto;
125 };
126 u32 seq;
127};
128
129/* Full description of state of transformer. */
130struct xfrm_state {
131#ifdef CONFIG_NET_NS
132 struct net *xs_net;
133#endif
134 union {
135 struct hlist_node gclist;
136 struct hlist_node bydst;
137 };
138 struct hlist_node bysrc;
139 struct hlist_node byspi;
140
141 atomic_t refcnt;
142 spinlock_t lock;
143
144 struct xfrm_id id;
145 struct xfrm_selector sel;
146 struct xfrm_mark mark;
147 u32 tfcpad;
148
149 u32 genid;
150
151 /* Key manager bits */
152 struct xfrm_state_walk km;
153
154 /* Parameters of this state. */
155 struct {
156 u32 reqid;
157 u8 mode;
158 u8 replay_window;
159 u8 aalgo, ealgo, calgo;
160 u8 flags;
161 u16 family;
162 xfrm_address_t saddr;
163 int header_len;
164 int trailer_len;
165 } props;
166
167 struct xfrm_lifetime_cfg lft;
168
169 /* Data for transformer */
170 struct xfrm_algo_auth *aalg;
171 struct xfrm_algo *ealg;
172 struct xfrm_algo *calg;
173 struct xfrm_algo_aead *aead;
174
175 /* Data for encapsulator */
176 struct xfrm_encap_tmpl *encap;
177
178 /* Data for care-of address */
179 xfrm_address_t *coaddr;
180
181 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
182 struct xfrm_state *tunnel;
183
184 /* If a tunnel, number of users + 1 */
185 atomic_t tunnel_users;
186
187 /* State for replay detection */
188 struct xfrm_replay_state replay;
189 struct xfrm_replay_state_esn *replay_esn;
190
191 /* Replay detection state at the time we sent the last notification */
192 struct xfrm_replay_state preplay;
193 struct xfrm_replay_state_esn *preplay_esn;
194
195 /* The functions for replay detection. */
196 struct xfrm_replay *repl;
197
198 /* internal flag that only holds state for delayed aevent at the
199 * moment
200 */
201 u32 xflags;
202
203 /* Replay detection notification settings */
204 u32 replay_maxage;
205 u32 replay_maxdiff;
206
207 /* Replay detection notification timer */
208 struct timer_list rtimer;
209
210 /* Statistics */
211 struct xfrm_stats stats;
212
213 struct xfrm_lifetime_cur curlft;
214 struct tasklet_hrtimer mtimer;
215
216 /* Last used time */
217 unsigned long lastused;
218
219 /* Reference to data common to all the instances of this
220 * transformer. */
221 const struct xfrm_type *type;
222 struct xfrm_mode *inner_mode;
223 struct xfrm_mode *inner_mode_iaf;
224 struct xfrm_mode *outer_mode;
225
226 /* Security context */
227 struct xfrm_sec_ctx *security;
228
229 /* Private data of this transformer, format is opaque,
230 * interpreted by xfrm_type methods. */
231 void *data;
232};
233
234static inline struct net *xs_net(struct xfrm_state *x)
235{
236 return read_pnet(&x->xs_net);
237}
238
239/* xflags - make enum if more show up */
240#define XFRM_TIME_DEFER 1
241
242enum {
243 XFRM_STATE_VOID,
244 XFRM_STATE_ACQ,
245 XFRM_STATE_VALID,
246 XFRM_STATE_ERROR,
247 XFRM_STATE_EXPIRED,
248 XFRM_STATE_DEAD
249};
250
251/* callback structure passed from either netlink or pfkey */
252struct km_event {
253 union {
254 u32 hard;
255 u32 proto;
256 u32 byid;
257 u32 aevent;
258 u32 type;
259 } data;
260
261 u32 seq;
262 u32 pid;
263 u32 event;
264 struct net *net;
265};
266
267struct xfrm_replay {
268 void (*advance)(struct xfrm_state *x, __be32 net_seq);
269 int (*check)(struct xfrm_state *x,
270 struct sk_buff *skb,
271 __be32 net_seq);
272 void (*notify)(struct xfrm_state *x, int event);
273 int (*overflow)(struct xfrm_state *x, struct sk_buff *skb);
274};
275
276struct net_device;
277struct xfrm_type;
278struct xfrm_dst;
279struct xfrm_policy_afinfo {
280 unsigned short family;
281 struct dst_ops *dst_ops;
282 void (*garbage_collect)(struct net *net);
283 struct dst_entry *(*dst_lookup)(struct net *net, int tos,
284 const xfrm_address_t *saddr,
285 const xfrm_address_t *daddr);
286 int (*get_saddr)(struct net *net, xfrm_address_t *saddr, xfrm_address_t *daddr);
287 void (*decode_session)(struct sk_buff *skb,
288 struct flowi *fl,
289 int reverse);
290 int (*get_tos)(const struct flowi *fl);
291 int (*init_path)(struct xfrm_dst *path,
292 struct dst_entry *dst,
293 int nfheader_len);
294 int (*fill_dst)(struct xfrm_dst *xdst,
295 struct net_device *dev,
296 const struct flowi *fl);
297 struct dst_entry *(*blackhole_route)(struct net *net, struct dst_entry *orig);
298};
299
300extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
301extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
302extern void km_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c);
303extern void km_state_notify(struct xfrm_state *x, const struct km_event *c);
304
305struct xfrm_tmpl;
306extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
307extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid);
308extern int __xfrm_state_delete(struct xfrm_state *x);
309
310struct xfrm_state_afinfo {
311 unsigned int family;
312 unsigned int proto;
313 __be16 eth_proto;
314 struct module *owner;
315 const struct xfrm_type *type_map[IPPROTO_MAX];
316 struct xfrm_mode *mode_map[XFRM_MODE_MAX];
317 int (*init_flags)(struct xfrm_state *x);
318 void (*init_tempsel)(struct xfrm_selector *sel,
319 const struct flowi *fl);
320 void (*init_temprop)(struct xfrm_state *x,
321 const struct xfrm_tmpl *tmpl,
322 const xfrm_address_t *daddr,
323 const xfrm_address_t *saddr);
324 int (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n);
325 int (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n);
326 int (*output)(struct sk_buff *skb);
327 int (*output_finish)(struct sk_buff *skb);
328 int (*extract_input)(struct xfrm_state *x,
329 struct sk_buff *skb);
330 int (*extract_output)(struct xfrm_state *x,
331 struct sk_buff *skb);
332 int (*transport_finish)(struct sk_buff *skb,
333 int async);
334};
335
336extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
337extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
338
339extern void xfrm_state_delete_tunnel(struct xfrm_state *x);
340
341struct xfrm_type {
342 char *description;
343 struct module *owner;
344 u8 proto;
345 u8 flags;
346#define XFRM_TYPE_NON_FRAGMENT 1
347#define XFRM_TYPE_REPLAY_PROT 2
348#define XFRM_TYPE_LOCAL_COADDR 4
349#define XFRM_TYPE_REMOTE_COADDR 8
350
351 int (*init_state)(struct xfrm_state *x);
352 void (*destructor)(struct xfrm_state *);
353 int (*input)(struct xfrm_state *, struct sk_buff *skb);
354 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
355 int (*reject)(struct xfrm_state *, struct sk_buff *,
356 const struct flowi *);
357 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
358 /* Estimate maximal size of result of transformation of a dgram */
359 u32 (*get_mtu)(struct xfrm_state *, int size);
360};
361
362extern int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
363extern int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
364
365struct xfrm_mode {
366 /*
367 * Remove encapsulation header.
368 *
369 * The IP header will be moved over the top of the encapsulation
370 * header.
371 *
372 * On entry, the transport header shall point to where the IP header
373 * should be and the network header shall be set to where the IP
374 * header currently is. skb->data shall point to the start of the
375 * payload.
376 */
377 int (*input2)(struct xfrm_state *x, struct sk_buff *skb);
378
379 /*
380 * This is the actual input entry point.
381 *
382 * For transport mode and equivalent this would be identical to
383 * input2 (which does not need to be set). While tunnel mode
384 * and equivalent would set this to the tunnel encapsulation function
385 * xfrm4_prepare_input that would in turn call input2.
386 */
387 int (*input)(struct xfrm_state *x, struct sk_buff *skb);
388
389 /*
390 * Add encapsulation header.
391 *
392 * On exit, the transport header will be set to the start of the
393 * encapsulation header to be filled in by x->type->output and
394 * the mac header will be set to the nextheader (protocol for
395 * IPv4) field of the extension header directly preceding the
396 * encapsulation header, or in its absence, that of the top IP
397 * header. The value of the network header will always point
398 * to the top IP header while skb->data will point to the payload.
399 */
400 int (*output2)(struct xfrm_state *x,struct sk_buff *skb);
401
402 /*
403 * This is the actual output entry point.
404 *
405 * For transport mode and equivalent this would be identical to
406 * output2 (which does not need to be set). While tunnel mode
407 * and equivalent would set this to a tunnel encapsulation function
408 * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn
409 * call output2.
410 */
411 int (*output)(struct xfrm_state *x, struct sk_buff *skb);
412
413 struct xfrm_state_afinfo *afinfo;
414 struct module *owner;
415 unsigned int encap;
416 int flags;
417};
418
419/* Flags for xfrm_mode. */
420enum {
421 XFRM_MODE_FLAG_TUNNEL = 1,
422};
423
424extern int xfrm_register_mode(struct xfrm_mode *mode, int family);
425extern int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
426
427static inline int xfrm_af2proto(unsigned int family)
428{
429 switch(family) {
430 case AF_INET:
431 return IPPROTO_IPIP;
432 case AF_INET6:
433 return IPPROTO_IPV6;
434 default:
435 return 0;
436 }
437}
438
439static inline struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
440{
441 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
442 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
443 return x->inner_mode;
444 else
445 return x->inner_mode_iaf;
446}
447
448struct xfrm_tmpl {
449/* id in template is interpreted as:
450 * daddr - destination of tunnel, may be zero for transport mode.
451 * spi - zero to acquire spi. Not zero if spi is static, then
452 * daddr must be fixed too.
453 * proto - AH/ESP/IPCOMP
454 */
455 struct xfrm_id id;
456
457/* Source address of tunnel. Ignored, if it is not a tunnel. */
458 xfrm_address_t saddr;
459
460 unsigned short encap_family;
461
462 u32 reqid;
463
464/* Mode: transport, tunnel etc. */
465 u8 mode;
466
467/* Sharing mode: unique, this session only, this user only etc. */
468 u8 share;
469
470/* May skip this transfomration if no SA is found */
471 u8 optional;
472
473/* Skip aalgos/ealgos/calgos checks. */
474 u8 allalgs;
475
476/* Bit mask of algos allowed for acquisition */
477 u32 aalgos;
478 u32 ealgos;
479 u32 calgos;
480};
481
482#define XFRM_MAX_DEPTH 6
483
484struct xfrm_policy_walk_entry {
485 struct list_head all;
486 u8 dead;
487};
488
489struct xfrm_policy_walk {
490 struct xfrm_policy_walk_entry walk;
491 u8 type;
492 u32 seq;
493};
494
495struct xfrm_policy {
496#ifdef CONFIG_NET_NS
497 struct net *xp_net;
498#endif
499 struct hlist_node bydst;
500 struct hlist_node byidx;
501
502 /* This lock only affects elements except for entry. */
503 rwlock_t lock;
504 atomic_t refcnt;
505 struct timer_list timer;
506
507 struct flow_cache_object flo;
508 atomic_t genid;
509 u32 priority;
510 u32 index;
511 struct xfrm_mark mark;
512 struct xfrm_selector selector;
513 struct xfrm_lifetime_cfg lft;
514 struct xfrm_lifetime_cur curlft;
515 struct xfrm_policy_walk_entry walk;
516 u8 type;
517 u8 action;
518 u8 flags;
519 u8 xfrm_nr;
520 u16 family;
521 struct xfrm_sec_ctx *security;
522 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
523};
524
525static inline struct net *xp_net(const struct xfrm_policy *xp)
526{
527 return read_pnet(&xp->xp_net);
528}
529
530struct xfrm_kmaddress {
531 xfrm_address_t local;
532 xfrm_address_t remote;
533 u32 reserved;
534 u16 family;
535};
536
537struct xfrm_migrate {
538 xfrm_address_t old_daddr;
539 xfrm_address_t old_saddr;
540 xfrm_address_t new_daddr;
541 xfrm_address_t new_saddr;
542 u8 proto;
543 u8 mode;
544 u16 reserved;
545 u32 reqid;
546 u16 old_family;
547 u16 new_family;
548};
549
550#define XFRM_KM_TIMEOUT 30
551/* which seqno */
552#define XFRM_REPLAY_SEQ 1
553#define XFRM_REPLAY_OSEQ 2
554#define XFRM_REPLAY_SEQ_MASK 3
555/* what happened */
556#define XFRM_REPLAY_UPDATE XFRM_AE_CR
557#define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
558
559/* default aevent timeout in units of 100ms */
560#define XFRM_AE_ETIME 10
561/* Async Event timer multiplier */
562#define XFRM_AE_ETH_M 10
563/* default seq threshold size */
564#define XFRM_AE_SEQT_SIZE 2
565
566struct xfrm_mgr {
567 struct list_head list;
568 char *id;
569 int (*notify)(struct xfrm_state *x, const struct km_event *c);
570 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
571 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
572 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
573 int (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c);
574 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
575 int (*migrate)(const struct xfrm_selector *sel,
576 u8 dir, u8 type,
577 const struct xfrm_migrate *m,
578 int num_bundles,
579 const struct xfrm_kmaddress *k);
580};
581
582extern int xfrm_register_km(struct xfrm_mgr *km);
583extern int xfrm_unregister_km(struct xfrm_mgr *km);
584
585/*
586 * This structure is used for the duration where packets are being
587 * transformed by IPsec. As soon as the packet leaves IPsec the
588 * area beyond the generic IP part may be overwritten.
589 */
590struct xfrm_skb_cb {
591 union {
592 struct inet_skb_parm h4;
593 struct inet6_skb_parm h6;
594 } header;
595
596 /* Sequence number for replay protection. */
597 union {
598 struct {
599 __u32 low;
600 __u32 hi;
601 } output;
602 struct {
603 __be32 low;
604 __be32 hi;
605 } input;
606 } seq;
607};
608
609#define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
610
611/*
612 * This structure is used by the afinfo prepare_input/prepare_output functions
613 * to transmit header information to the mode input/output functions.
614 */
615struct xfrm_mode_skb_cb {
616 union {
617 struct inet_skb_parm h4;
618 struct inet6_skb_parm h6;
619 } header;
620
621 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
622 __be16 id;
623 __be16 frag_off;
624
625 /* IP header length (excluding options or extension headers). */
626 u8 ihl;
627
628 /* TOS for IPv4, class for IPv6. */
629 u8 tos;
630
631 /* TTL for IPv4, hop limitfor IPv6. */
632 u8 ttl;
633
634 /* Protocol for IPv4, NH for IPv6. */
635 u8 protocol;
636
637 /* Option length for IPv4, zero for IPv6. */
638 u8 optlen;
639
640 /* Used by IPv6 only, zero for IPv4. */
641 u8 flow_lbl[3];
642};
643
644#define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
645
646/*
647 * This structure is used by the input processing to locate the SPI and
648 * related information.
649 */
650struct xfrm_spi_skb_cb {
651 union {
652 struct inet_skb_parm h4;
653 struct inet6_skb_parm h6;
654 } header;
655
656 unsigned int daddroff;
657 unsigned int family;
658};
659
660#define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
661
662/* Audit Information */
663struct xfrm_audit {
664 u32 secid;
665 uid_t loginuid;
666 u32 sessionid;
667};
668
669#ifdef CONFIG_AUDITSYSCALL
670static inline struct audit_buffer *xfrm_audit_start(const char *op)
671{
672 struct audit_buffer *audit_buf = NULL;
673
674 if (audit_enabled == 0)
675 return NULL;
676 audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC,
677 AUDIT_MAC_IPSEC_EVENT);
678 if (audit_buf == NULL)
679 return NULL;
680 audit_log_format(audit_buf, "op=%s", op);
681 return audit_buf;
682}
683
684static inline void xfrm_audit_helper_usrinfo(uid_t auid, u32 ses, u32 secid,
685 struct audit_buffer *audit_buf)
686{
687 char *secctx;
688 u32 secctx_len;
689
690 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
691 if (secid != 0 &&
692 security_secid_to_secctx(secid, &secctx, &secctx_len) == 0) {
693 audit_log_format(audit_buf, " subj=%s", secctx);
694 security_release_secctx(secctx, secctx_len);
695 } else
696 audit_log_task_context(audit_buf);
697}
698
699extern void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
700 u32 auid, u32 ses, u32 secid);
701extern void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
702 u32 auid, u32 ses, u32 secid);
703extern void xfrm_audit_state_add(struct xfrm_state *x, int result,
704 u32 auid, u32 ses, u32 secid);
705extern void xfrm_audit_state_delete(struct xfrm_state *x, int result,
706 u32 auid, u32 ses, u32 secid);
707extern void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
708 struct sk_buff *skb);
709extern void xfrm_audit_state_replay(struct xfrm_state *x,
710 struct sk_buff *skb, __be32 net_seq);
711extern void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
712extern void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
713 __be32 net_spi, __be32 net_seq);
714extern void xfrm_audit_state_icvfail(struct xfrm_state *x,
715 struct sk_buff *skb, u8 proto);
716#else
717
718static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
719 u32 auid, u32 ses, u32 secid)
720{
721}
722
723static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
724 u32 auid, u32 ses, u32 secid)
725{
726}
727
728static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
729 u32 auid, u32 ses, u32 secid)
730{
731}
732
733static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
734 u32 auid, u32 ses, u32 secid)
735{
736}
737
738static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
739 struct sk_buff *skb)
740{
741}
742
743static inline void xfrm_audit_state_replay(struct xfrm_state *x,
744 struct sk_buff *skb, __be32 net_seq)
745{
746}
747
748static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
749 u16 family)
750{
751}
752
753static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
754 __be32 net_spi, __be32 net_seq)
755{
756}
757
758static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
759 struct sk_buff *skb, u8 proto)
760{
761}
762#endif /* CONFIG_AUDITSYSCALL */
763
764static inline void xfrm_pol_hold(struct xfrm_policy *policy)
765{
766 if (likely(policy != NULL))
767 atomic_inc(&policy->refcnt);
768}
769
770extern void xfrm_policy_destroy(struct xfrm_policy *policy);
771
772static inline void xfrm_pol_put(struct xfrm_policy *policy)
773{
774 if (atomic_dec_and_test(&policy->refcnt))
775 xfrm_policy_destroy(policy);
776}
777
778static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
779{
780 int i;
781 for (i = npols - 1; i >= 0; --i)
782 xfrm_pol_put(pols[i]);
783}
784
785extern void __xfrm_state_destroy(struct xfrm_state *);
786
787static inline void __xfrm_state_put(struct xfrm_state *x)
788{
789 atomic_dec(&x->refcnt);
790}
791
792static inline void xfrm_state_put(struct xfrm_state *x)
793{
794 if (atomic_dec_and_test(&x->refcnt))
795 __xfrm_state_destroy(x);
796}
797
798static inline void xfrm_state_hold(struct xfrm_state *x)
799{
800 atomic_inc(&x->refcnt);
801}
802
803static inline bool addr_match(const void *token1, const void *token2,
804 int prefixlen)
805{
806 const __be32 *a1 = token1;
807 const __be32 *a2 = token2;
808 int pdw;
809 int pbi;
810
811 pdw = prefixlen >> 5; /* num of whole u32 in prefix */
812 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
813
814 if (pdw)
815 if (memcmp(a1, a2, pdw << 2))
816 return false;
817
818 if (pbi) {
819 __be32 mask;
820
821 mask = htonl((0xffffffff) << (32 - pbi));
822
823 if ((a1[pdw] ^ a2[pdw]) & mask)
824 return false;
825 }
826
827 return true;
828}
829
830static __inline__
831__be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli)
832{
833 __be16 port;
834 switch(fl->flowi_proto) {
835 case IPPROTO_TCP:
836 case IPPROTO_UDP:
837 case IPPROTO_UDPLITE:
838 case IPPROTO_SCTP:
839 port = uli->ports.sport;
840 break;
841 case IPPROTO_ICMP:
842 case IPPROTO_ICMPV6:
843 port = htons(uli->icmpt.type);
844 break;
845 case IPPROTO_MH:
846 port = htons(uli->mht.type);
847 break;
848 case IPPROTO_GRE:
849 port = htons(ntohl(uli->gre_key) >> 16);
850 break;
851 default:
852 port = 0; /*XXX*/
853 }
854 return port;
855}
856
857static __inline__
858__be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli)
859{
860 __be16 port;
861 switch(fl->flowi_proto) {
862 case IPPROTO_TCP:
863 case IPPROTO_UDP:
864 case IPPROTO_UDPLITE:
865 case IPPROTO_SCTP:
866 port = uli->ports.dport;
867 break;
868 case IPPROTO_ICMP:
869 case IPPROTO_ICMPV6:
870 port = htons(uli->icmpt.code);
871 break;
872 case IPPROTO_GRE:
873 port = htons(ntohl(uli->gre_key) & 0xffff);
874 break;
875 default:
876 port = 0; /*XXX*/
877 }
878 return port;
879}
880
881extern int xfrm_selector_match(const struct xfrm_selector *sel,
882 const struct flowi *fl,
883 unsigned short family);
884
885#ifdef CONFIG_SECURITY_NETWORK_XFRM
886/* If neither has a context --> match
887 * Otherwise, both must have a context and the sids, doi, alg must match
888 */
889static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
890{
891 return ((!s1 && !s2) ||
892 (s1 && s2 &&
893 (s1->ctx_sid == s2->ctx_sid) &&
894 (s1->ctx_doi == s2->ctx_doi) &&
895 (s1->ctx_alg == s2->ctx_alg)));
896}
897#else
898static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
899{
900 return 1;
901}
902#endif
903
904/* A struct encoding bundle of transformations to apply to some set of flow.
905 *
906 * dst->child points to the next element of bundle.
907 * dst->xfrm points to an instanse of transformer.
908 *
909 * Due to unfortunate limitations of current routing cache, which we
910 * have no time to fix, it mirrors struct rtable and bound to the same
911 * routing key, including saddr,daddr. However, we can have many of
912 * bundles differing by session id. All the bundles grow from a parent
913 * policy rule.
914 */
915struct xfrm_dst {
916 union {
917 struct dst_entry dst;
918 struct rtable rt;
919 struct rt6_info rt6;
920 } u;
921 struct dst_entry *route;
922 struct flow_cache_object flo;
923 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
924 int num_pols, num_xfrms;
925#ifdef CONFIG_XFRM_SUB_POLICY
926 struct flowi *origin;
927 struct xfrm_selector *partner;
928#endif
929 u32 xfrm_genid;
930 u32 policy_genid;
931 u32 route_mtu_cached;
932 u32 child_mtu_cached;
933 u32 route_cookie;
934 u32 path_cookie;
935};
936
937#ifdef CONFIG_XFRM
938static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
939{
940 xfrm_pols_put(xdst->pols, xdst->num_pols);
941 dst_release(xdst->route);
942 if (likely(xdst->u.dst.xfrm))
943 xfrm_state_put(xdst->u.dst.xfrm);
944#ifdef CONFIG_XFRM_SUB_POLICY
945 kfree(xdst->origin);
946 xdst->origin = NULL;
947 kfree(xdst->partner);
948 xdst->partner = NULL;
949#endif
950}
951#endif
952
953extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
954
955struct sec_path {
956 atomic_t refcnt;
957 int len;
958 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
959};
960
961static inline int secpath_exists(struct sk_buff *skb)
962{
963#ifdef CONFIG_XFRM
964 return skb->sp != NULL;
965#else
966 return 0;
967#endif
968}
969
970static inline struct sec_path *
971secpath_get(struct sec_path *sp)
972{
973 if (sp)
974 atomic_inc(&sp->refcnt);
975 return sp;
976}
977
978extern void __secpath_destroy(struct sec_path *sp);
979
980static inline void
981secpath_put(struct sec_path *sp)
982{
983 if (sp && atomic_dec_and_test(&sp->refcnt))
984 __secpath_destroy(sp);
985}
986
987extern struct sec_path *secpath_dup(struct sec_path *src);
988
989static inline void
990secpath_reset(struct sk_buff *skb)
991{
992#ifdef CONFIG_XFRM
993 secpath_put(skb->sp);
994 skb->sp = NULL;
995#endif
996}
997
998static inline int
999xfrm_addr_any(const xfrm_address_t *addr, unsigned short family)
1000{
1001 switch (family) {
1002 case AF_INET:
1003 return addr->a4 == 0;
1004 case AF_INET6:
1005 return ipv6_addr_any((struct in6_addr *)&addr->a6);
1006 }
1007 return 0;
1008}
1009
1010static inline int
1011__xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1012{
1013 return (tmpl->saddr.a4 &&
1014 tmpl->saddr.a4 != x->props.saddr.a4);
1015}
1016
1017static inline int
1018__xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1019{
1020 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
1021 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
1022}
1023
1024static inline int
1025xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family)
1026{
1027 switch (family) {
1028 case AF_INET:
1029 return __xfrm4_state_addr_cmp(tmpl, x);
1030 case AF_INET6:
1031 return __xfrm6_state_addr_cmp(tmpl, x);
1032 }
1033 return !0;
1034}
1035
1036#ifdef CONFIG_XFRM
1037extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
1038
1039static inline int __xfrm_policy_check2(struct sock *sk, int dir,
1040 struct sk_buff *skb,
1041 unsigned int family, int reverse)
1042{
1043 struct net *net = dev_net(skb->dev);
1044 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
1045
1046 if (sk && sk->sk_policy[XFRM_POLICY_IN])
1047 return __xfrm_policy_check(sk, ndir, skb, family);
1048
1049 return (!net->xfrm.policy_count[dir] && !skb->sp) ||
1050 (skb_dst(skb)->flags & DST_NOPOLICY) ||
1051 __xfrm_policy_check(sk, ndir, skb, family);
1052}
1053
1054static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1055{
1056 return __xfrm_policy_check2(sk, dir, skb, family, 0);
1057}
1058
1059static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1060{
1061 return xfrm_policy_check(sk, dir, skb, AF_INET);
1062}
1063
1064static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1065{
1066 return xfrm_policy_check(sk, dir, skb, AF_INET6);
1067}
1068
1069static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1070 struct sk_buff *skb)
1071{
1072 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1073}
1074
1075static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1076 struct sk_buff *skb)
1077{
1078 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1079}
1080
1081extern int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1082 unsigned int family, int reverse);
1083
1084static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1085 unsigned int family)
1086{
1087 return __xfrm_decode_session(skb, fl, family, 0);
1088}
1089
1090static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1091 struct flowi *fl,
1092 unsigned int family)
1093{
1094 return __xfrm_decode_session(skb, fl, family, 1);
1095}
1096
1097extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1098
1099static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1100{
1101 struct net *net = dev_net(skb->dev);
1102
1103 return !net->xfrm.policy_count[XFRM_POLICY_OUT] ||
1104 (skb_dst(skb)->flags & DST_NOXFRM) ||
1105 __xfrm_route_forward(skb, family);
1106}
1107
1108static inline int xfrm4_route_forward(struct sk_buff *skb)
1109{
1110 return xfrm_route_forward(skb, AF_INET);
1111}
1112
1113static inline int xfrm6_route_forward(struct sk_buff *skb)
1114{
1115 return xfrm_route_forward(skb, AF_INET6);
1116}
1117
1118extern int __xfrm_sk_clone_policy(struct sock *sk);
1119
1120static inline int xfrm_sk_clone_policy(struct sock *sk)
1121{
1122 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
1123 return __xfrm_sk_clone_policy(sk);
1124 return 0;
1125}
1126
1127extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1128
1129static inline void xfrm_sk_free_policy(struct sock *sk)
1130{
1131 if (unlikely(sk->sk_policy[0] != NULL)) {
1132 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
1133 sk->sk_policy[0] = NULL;
1134 }
1135 if (unlikely(sk->sk_policy[1] != NULL)) {
1136 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
1137 sk->sk_policy[1] = NULL;
1138 }
1139}
1140
1141#else
1142
1143static inline void xfrm_sk_free_policy(struct sock *sk) {}
1144static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
1145static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1146static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1147static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1148{
1149 return 1;
1150}
1151static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1152{
1153 return 1;
1154}
1155static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1156{
1157 return 1;
1158}
1159static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1160 struct flowi *fl,
1161 unsigned int family)
1162{
1163 return -ENOSYS;
1164}
1165static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1166 struct sk_buff *skb)
1167{
1168 return 1;
1169}
1170static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1171 struct sk_buff *skb)
1172{
1173 return 1;
1174}
1175#endif
1176
1177static __inline__
1178xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family)
1179{
1180 switch (family){
1181 case AF_INET:
1182 return (xfrm_address_t *)&fl->u.ip4.daddr;
1183 case AF_INET6:
1184 return (xfrm_address_t *)&fl->u.ip6.daddr;
1185 }
1186 return NULL;
1187}
1188
1189static __inline__
1190xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family)
1191{
1192 switch (family){
1193 case AF_INET:
1194 return (xfrm_address_t *)&fl->u.ip4.saddr;
1195 case AF_INET6:
1196 return (xfrm_address_t *)&fl->u.ip6.saddr;
1197 }
1198 return NULL;
1199}
1200
1201static __inline__
1202void xfrm_flowi_addr_get(const struct flowi *fl,
1203 xfrm_address_t *saddr, xfrm_address_t *daddr,
1204 unsigned short family)
1205{
1206 switch(family) {
1207 case AF_INET:
1208 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4));
1209 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4));
1210 break;
1211 case AF_INET6:
1212 ipv6_addr_copy((struct in6_addr *)&saddr->a6, &fl->u.ip6.saddr);
1213 ipv6_addr_copy((struct in6_addr *)&daddr->a6, &fl->u.ip6.daddr);
1214 break;
1215 }
1216}
1217
1218static __inline__ int
1219__xfrm4_state_addr_check(const struct xfrm_state *x,
1220 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1221{
1222 if (daddr->a4 == x->id.daddr.a4 &&
1223 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1224 return 1;
1225 return 0;
1226}
1227
1228static __inline__ int
1229__xfrm6_state_addr_check(const struct xfrm_state *x,
1230 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1231{
1232 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1233 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
1234 ipv6_addr_any((struct in6_addr *)saddr) ||
1235 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1236 return 1;
1237 return 0;
1238}
1239
1240static __inline__ int
1241xfrm_state_addr_check(const struct xfrm_state *x,
1242 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1243 unsigned short family)
1244{
1245 switch (family) {
1246 case AF_INET:
1247 return __xfrm4_state_addr_check(x, daddr, saddr);
1248 case AF_INET6:
1249 return __xfrm6_state_addr_check(x, daddr, saddr);
1250 }
1251 return 0;
1252}
1253
1254static __inline__ int
1255xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl,
1256 unsigned short family)
1257{
1258 switch (family) {
1259 case AF_INET:
1260 return __xfrm4_state_addr_check(x,
1261 (const xfrm_address_t *)&fl->u.ip4.daddr,
1262 (const xfrm_address_t *)&fl->u.ip4.saddr);
1263 case AF_INET6:
1264 return __xfrm6_state_addr_check(x,
1265 (const xfrm_address_t *)&fl->u.ip6.daddr,
1266 (const xfrm_address_t *)&fl->u.ip6.saddr);
1267 }
1268 return 0;
1269}
1270
1271static inline int xfrm_state_kern(const struct xfrm_state *x)
1272{
1273 return atomic_read(&x->tunnel_users);
1274}
1275
1276static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1277{
1278 return (!userproto || proto == userproto ||
1279 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1280 proto == IPPROTO_ESP ||
1281 proto == IPPROTO_COMP)));
1282}
1283
1284/*
1285 * xfrm algorithm information
1286 */
1287struct xfrm_algo_aead_info {
1288 u16 icv_truncbits;
1289};
1290
1291struct xfrm_algo_auth_info {
1292 u16 icv_truncbits;
1293 u16 icv_fullbits;
1294};
1295
1296struct xfrm_algo_encr_info {
1297 u16 blockbits;
1298 u16 defkeybits;
1299};
1300
1301struct xfrm_algo_comp_info {
1302 u16 threshold;
1303};
1304
1305struct xfrm_algo_desc {
1306 char *name;
1307 char *compat;
1308 u8 available:1;
1309 union {
1310 struct xfrm_algo_aead_info aead;
1311 struct xfrm_algo_auth_info auth;
1312 struct xfrm_algo_encr_info encr;
1313 struct xfrm_algo_comp_info comp;
1314 } uinfo;
1315 struct sadb_alg desc;
1316};
1317
1318/* XFRM tunnel handlers. */
1319struct xfrm_tunnel {
1320 int (*handler)(struct sk_buff *skb);
1321 int (*err_handler)(struct sk_buff *skb, u32 info);
1322
1323 struct xfrm_tunnel __rcu *next;
1324 int priority;
1325};
1326
1327struct xfrm6_tunnel {
1328 int (*handler)(struct sk_buff *skb);
1329 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1330 u8 type, u8 code, int offset, __be32 info);
1331 struct xfrm6_tunnel __rcu *next;
1332 int priority;
1333};
1334
1335extern void xfrm_init(void);
1336extern void xfrm4_init(int rt_hash_size);
1337extern int xfrm_state_init(struct net *net);
1338extern void xfrm_state_fini(struct net *net);
1339extern void xfrm4_state_init(void);
1340#ifdef CONFIG_XFRM
1341extern int xfrm6_init(void);
1342extern void xfrm6_fini(void);
1343extern int xfrm6_state_init(void);
1344extern void xfrm6_state_fini(void);
1345#else
1346static inline int xfrm6_init(void)
1347{
1348 return 0;
1349}
1350static inline void xfrm6_fini(void)
1351{
1352 ;
1353}
1354#endif
1355
1356#ifdef CONFIG_XFRM_STATISTICS
1357extern int xfrm_proc_init(struct net *net);
1358extern void xfrm_proc_fini(struct net *net);
1359#endif
1360
1361extern int xfrm_sysctl_init(struct net *net);
1362#ifdef CONFIG_SYSCTL
1363extern void xfrm_sysctl_fini(struct net *net);
1364#else
1365static inline void xfrm_sysctl_fini(struct net *net)
1366{
1367}
1368#endif
1369
1370extern void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto);
1371extern int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1372 int (*func)(struct xfrm_state *, int, void*), void *);
1373extern void xfrm_state_walk_done(struct xfrm_state_walk *walk);
1374extern struct xfrm_state *xfrm_state_alloc(struct net *net);
1375extern struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr,
1376 const xfrm_address_t *saddr,
1377 const struct flowi *fl,
1378 struct xfrm_tmpl *tmpl,
1379 struct xfrm_policy *pol, int *err,
1380 unsigned short family);
1381extern struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark,
1382 xfrm_address_t *daddr,
1383 xfrm_address_t *saddr,
1384 unsigned short family,
1385 u8 mode, u8 proto, u32 reqid);
1386extern int xfrm_state_check_expire(struct xfrm_state *x);
1387extern void xfrm_state_insert(struct xfrm_state *x);
1388extern int xfrm_state_add(struct xfrm_state *x);
1389extern int xfrm_state_update(struct xfrm_state *x);
1390extern struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1391 const xfrm_address_t *daddr, __be32 spi,
1392 u8 proto, unsigned short family);
1393extern struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1394 const xfrm_address_t *daddr,
1395 const xfrm_address_t *saddr,
1396 u8 proto,
1397 unsigned short family);
1398#ifdef CONFIG_XFRM_SUB_POLICY
1399extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1400 int n, unsigned short family);
1401extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1402 int n, unsigned short family);
1403#else
1404static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1405 int n, unsigned short family)
1406{
1407 return -ENOSYS;
1408}
1409
1410static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1411 int n, unsigned short family)
1412{
1413 return -ENOSYS;
1414}
1415#endif
1416
1417struct xfrmk_sadinfo {
1418 u32 sadhcnt; /* current hash bkts */
1419 u32 sadhmcnt; /* max allowed hash bkts */
1420 u32 sadcnt; /* current running count */
1421};
1422
1423struct xfrmk_spdinfo {
1424 u32 incnt;
1425 u32 outcnt;
1426 u32 fwdcnt;
1427 u32 inscnt;
1428 u32 outscnt;
1429 u32 fwdscnt;
1430 u32 spdhcnt;
1431 u32 spdhmcnt;
1432};
1433
1434extern struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark,
1435 u32 seq);
1436extern int xfrm_state_delete(struct xfrm_state *x);
1437extern int xfrm_state_flush(struct net *net, u8 proto, struct xfrm_audit *audit_info);
1438extern void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1439extern void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1440extern u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq);
1441extern int xfrm_init_replay(struct xfrm_state *x);
1442extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1443extern int __xfrm_init_state(struct xfrm_state *x, bool init_replay);
1444extern int xfrm_init_state(struct xfrm_state *x);
1445extern int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
1446extern int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi,
1447 int encap_type);
1448extern int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1449extern int xfrm_output_resume(struct sk_buff *skb, int err);
1450extern int xfrm_output(struct sk_buff *skb);
1451extern int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1452extern int xfrm4_extract_header(struct sk_buff *skb);
1453extern int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1454extern int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1455 int encap_type);
1456extern int xfrm4_transport_finish(struct sk_buff *skb, int async);
1457extern int xfrm4_rcv(struct sk_buff *skb);
1458
1459static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1460{
1461 return xfrm4_rcv_encap(skb, nexthdr, spi, 0);
1462}
1463
1464extern int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1465extern int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1466extern int xfrm4_output(struct sk_buff *skb);
1467extern int xfrm4_output_finish(struct sk_buff *skb);
1468extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1469extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1470extern int xfrm6_extract_header(struct sk_buff *skb);
1471extern int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1472extern int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi);
1473extern int xfrm6_transport_finish(struct sk_buff *skb, int async);
1474extern int xfrm6_rcv(struct sk_buff *skb);
1475extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1476 xfrm_address_t *saddr, u8 proto);
1477extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1478extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1479extern __be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1480extern __be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr);
1481extern int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1482extern int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1483extern int xfrm6_output(struct sk_buff *skb);
1484extern int xfrm6_output_finish(struct sk_buff *skb);
1485extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1486 u8 **prevhdr);
1487
1488#ifdef CONFIG_XFRM
1489extern int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1490extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
1491#else
1492static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1493{
1494 return -ENOPROTOOPT;
1495}
1496
1497static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1498{
1499 /* should not happen */
1500 kfree_skb(skb);
1501 return 0;
1502}
1503#endif
1504
1505struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1506
1507extern void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1508extern int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1509 int (*func)(struct xfrm_policy *, int, int, void*), void *);
1510extern void xfrm_policy_walk_done(struct xfrm_policy_walk *walk);
1511int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1512struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark,
1513 u8 type, int dir,
1514 struct xfrm_selector *sel,
1515 struct xfrm_sec_ctx *ctx, int delete,
1516 int *err);
1517struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8, int dir, u32 id, int delete, int *err);
1518int xfrm_policy_flush(struct net *net, u8 type, struct xfrm_audit *audit_info);
1519u32 xfrm_get_acqseq(void);
1520extern int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1521struct xfrm_state *xfrm_find_acq(struct net *net, struct xfrm_mark *mark,
1522 u8 mode, u32 reqid, u8 proto,
1523 const xfrm_address_t *daddr,
1524 const xfrm_address_t *saddr, int create,
1525 unsigned short family);
1526extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1527
1528#ifdef CONFIG_XFRM_MIGRATE
1529extern int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1530 const struct xfrm_migrate *m, int num_bundles,
1531 const struct xfrm_kmaddress *k);
1532extern struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m);
1533extern struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
1534 struct xfrm_migrate *m);
1535extern int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1536 struct xfrm_migrate *m, int num_bundles,
1537 struct xfrm_kmaddress *k);
1538#endif
1539
1540extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1541extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid);
1542extern int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
1543
1544extern void xfrm_input_init(void);
1545extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1546
1547extern void xfrm_probe_algs(void);
1548extern int xfrm_count_auth_supported(void);
1549extern int xfrm_count_enc_supported(void);
1550extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1551extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1552extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1553extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1554extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1555extern struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe);
1556extern struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe);
1557extern struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe);
1558extern struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len,
1559 int probe);
1560
1561struct hash_desc;
1562struct scatterlist;
1563typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *,
1564 unsigned int);
1565
1566static inline int xfrm_addr_cmp(const xfrm_address_t *a,
1567 const xfrm_address_t *b,
1568 int family)
1569{
1570 switch (family) {
1571 default:
1572 case AF_INET:
1573 return (__force u32)a->a4 - (__force u32)b->a4;
1574 case AF_INET6:
1575 return ipv6_addr_cmp((const struct in6_addr *)a,
1576 (const struct in6_addr *)b);
1577 }
1578}
1579
1580static inline int xfrm_policy_id2dir(u32 index)
1581{
1582 return index & 7;
1583}
1584
1585#ifdef CONFIG_XFRM
1586static inline int xfrm_aevent_is_on(struct net *net)
1587{
1588 struct sock *nlsk;
1589 int ret = 0;
1590
1591 rcu_read_lock();
1592 nlsk = rcu_dereference(net->xfrm.nlsk);
1593 if (nlsk)
1594 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1595 rcu_read_unlock();
1596 return ret;
1597}
1598#endif
1599
1600static inline int xfrm_alg_len(const struct xfrm_algo *alg)
1601{
1602 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1603}
1604
1605static inline int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg)
1606{
1607 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1608}
1609
1610static inline int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn)
1611{
1612 return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32);
1613}
1614
1615#ifdef CONFIG_XFRM_MIGRATE
1616static inline int xfrm_replay_clone(struct xfrm_state *x,
1617 struct xfrm_state *orig)
1618{
1619 x->replay_esn = kzalloc(xfrm_replay_state_esn_len(orig->replay_esn),
1620 GFP_KERNEL);
1621 if (!x->replay_esn)
1622 return -ENOMEM;
1623
1624 x->replay_esn->bmp_len = orig->replay_esn->bmp_len;
1625 x->replay_esn->replay_window = orig->replay_esn->replay_window;
1626
1627 x->preplay_esn = kmemdup(x->replay_esn,
1628 xfrm_replay_state_esn_len(x->replay_esn),
1629 GFP_KERNEL);
1630 if (!x->preplay_esn) {
1631 kfree(x->replay_esn);
1632 return -ENOMEM;
1633 }
1634
1635 return 0;
1636}
1637
1638static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1639{
1640 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1641}
1642
1643static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1644{
1645 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1646}
1647
1648static inline void xfrm_states_put(struct xfrm_state **states, int n)
1649{
1650 int i;
1651 for (i = 0; i < n; i++)
1652 xfrm_state_put(*(states + i));
1653}
1654
1655static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1656{
1657 int i;
1658 for (i = 0; i < n; i++)
1659 xfrm_state_delete(*(states + i));
1660}
1661#endif
1662
1663#ifdef CONFIG_XFRM
1664static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1665{
1666 return skb->sp->xvec[skb->sp->len - 1];
1667}
1668#endif
1669
1670static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
1671{
1672 if (attrs[XFRMA_MARK])
1673 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark));
1674 else
1675 m->v = m->m = 0;
1676
1677 return m->v & m->m;
1678}
1679
1680static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m)
1681{
1682 if (m->m | m->v)
1683 NLA_PUT(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
1684 return 0;
1685
1686nla_put_failure:
1687 return -1;
1688}
1689
1690#endif /* _NET_XFRM_H */
1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _NET_XFRM_H
3#define _NET_XFRM_H
4
5#include <linux/compiler.h>
6#include <linux/xfrm.h>
7#include <linux/spinlock.h>
8#include <linux/list.h>
9#include <linux/skbuff.h>
10#include <linux/socket.h>
11#include <linux/pfkeyv2.h>
12#include <linux/ipsec.h>
13#include <linux/in6.h>
14#include <linux/mutex.h>
15#include <linux/audit.h>
16#include <linux/slab.h>
17#include <linux/refcount.h>
18#include <linux/sockptr.h>
19
20#include <net/sock.h>
21#include <net/dst.h>
22#include <net/ip.h>
23#include <net/route.h>
24#include <net/ipv6.h>
25#include <net/ip6_fib.h>
26#include <net/flow.h>
27#include <net/gro_cells.h>
28
29#include <linux/interrupt.h>
30
31#ifdef CONFIG_XFRM_STATISTICS
32#include <net/snmp.h>
33#endif
34
35#define XFRM_PROTO_ESP 50
36#define XFRM_PROTO_AH 51
37#define XFRM_PROTO_COMP 108
38#define XFRM_PROTO_IPIP 4
39#define XFRM_PROTO_IPV6 41
40#define XFRM_PROTO_ROUTING IPPROTO_ROUTING
41#define XFRM_PROTO_DSTOPTS IPPROTO_DSTOPTS
42
43#define XFRM_ALIGN4(len) (((len) + 3) & ~3)
44#define XFRM_ALIGN8(len) (((len) + 7) & ~7)
45#define MODULE_ALIAS_XFRM_MODE(family, encap) \
46 MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap))
47#define MODULE_ALIAS_XFRM_TYPE(family, proto) \
48 MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto))
49#define MODULE_ALIAS_XFRM_OFFLOAD_TYPE(family, proto) \
50 MODULE_ALIAS("xfrm-offload-" __stringify(family) "-" __stringify(proto))
51
52#ifdef CONFIG_XFRM_STATISTICS
53#define XFRM_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.xfrm_statistics, field)
54#else
55#define XFRM_INC_STATS(net, field) ((void)(net))
56#endif
57
58
59/* Organization of SPD aka "XFRM rules"
60 ------------------------------------
61
62 Basic objects:
63 - policy rule, struct xfrm_policy (=SPD entry)
64 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
65 - instance of a transformer, struct xfrm_state (=SA)
66 - template to clone xfrm_state, struct xfrm_tmpl
67
68 SPD is plain linear list of xfrm_policy rules, ordered by priority.
69 (To be compatible with existing pfkeyv2 implementations,
70 many rules with priority of 0x7fffffff are allowed to exist and
71 such rules are ordered in an unpredictable way, thanks to bsd folks.)
72
73 Lookup is plain linear search until the first match with selector.
74
75 If "action" is "block", then we prohibit the flow, otherwise:
76 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
77 policy entry has list of up to XFRM_MAX_DEPTH transformations,
78 described by templates xfrm_tmpl. Each template is resolved
79 to a complete xfrm_state (see below) and we pack bundle of transformations
80 to a dst_entry returned to requestor.
81
82 dst -. xfrm .-> xfrm_state #1
83 |---. child .-> dst -. xfrm .-> xfrm_state #2
84 |---. child .-> dst -. xfrm .-> xfrm_state #3
85 |---. child .-> NULL
86
87 Bundles are cached at xrfm_policy struct (field ->bundles).
88
89
90 Resolution of xrfm_tmpl
91 -----------------------
92 Template contains:
93 1. ->mode Mode: transport or tunnel
94 2. ->id.proto Protocol: AH/ESP/IPCOMP
95 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode.
96 Q: allow to resolve security gateway?
97 4. ->id.spi If not zero, static SPI.
98 5. ->saddr Local tunnel endpoint, ignored for transport mode.
99 6. ->algos List of allowed algos. Plain bitmask now.
100 Q: ealgos, aalgos, calgos. What a mess...
101 7. ->share Sharing mode.
102 Q: how to implement private sharing mode? To add struct sock* to
103 flow id?
104
105 Having this template we search through SAD searching for entries
106 with appropriate mode/proto/algo, permitted by selector.
107 If no appropriate entry found, it is requested from key manager.
108
109 PROBLEMS:
110 Q: How to find all the bundles referring to a physical path for
111 PMTU discovery? Seems, dst should contain list of all parents...
112 and enter to infinite locking hierarchy disaster.
113 No! It is easier, we will not search for them, let them find us.
114 We add genid to each dst plus pointer to genid of raw IP route,
115 pmtu disc will update pmtu on raw IP route and increase its genid.
116 dst_check() will see this for top level and trigger resyncing
117 metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
118 */
119
120struct xfrm_state_walk {
121 struct list_head all;
122 u8 state;
123 u8 dying;
124 u8 proto;
125 u32 seq;
126 struct xfrm_address_filter *filter;
127};
128
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
141enum {
142 XFRM_DEV_OFFLOAD_FLAG_ACQ = 1,
143};
144
145struct xfrm_dev_offload {
146 struct net_device *dev;
147 netdevice_tracker dev_tracker;
148 struct net_device *real_dev;
149 unsigned long offload_handle;
150 u8 dir : 2;
151 u8 type : 2;
152 u8 flags : 2;
153};
154
155struct xfrm_mode {
156 u8 encap;
157 u8 family;
158 u8 flags;
159};
160
161/* Flags for xfrm_mode. */
162enum {
163 XFRM_MODE_FLAG_TUNNEL = 1,
164};
165
166enum xfrm_replay_mode {
167 XFRM_REPLAY_MODE_LEGACY,
168 XFRM_REPLAY_MODE_BMP,
169 XFRM_REPLAY_MODE_ESN,
170};
171
172/* Full description of state of transformer. */
173struct xfrm_state {
174 possible_net_t xs_net;
175 union {
176 struct hlist_node gclist;
177 struct hlist_node bydst;
178 };
179 struct hlist_node bysrc;
180 struct hlist_node byspi;
181 struct hlist_node byseq;
182
183 refcount_t refcnt;
184 spinlock_t lock;
185
186 struct xfrm_id id;
187 struct xfrm_selector sel;
188 struct xfrm_mark mark;
189 u32 if_id;
190 u32 tfcpad;
191
192 u32 genid;
193
194 /* Key manager bits */
195 struct xfrm_state_walk km;
196
197 /* Parameters of this state. */
198 struct {
199 u32 reqid;
200 u8 mode;
201 u8 replay_window;
202 u8 aalgo, ealgo, calgo;
203 u8 flags;
204 u16 family;
205 xfrm_address_t saddr;
206 int header_len;
207 int trailer_len;
208 u32 extra_flags;
209 struct xfrm_mark smark;
210 } props;
211
212 struct xfrm_lifetime_cfg lft;
213
214 /* Data for transformer */
215 struct xfrm_algo_auth *aalg;
216 struct xfrm_algo *ealg;
217 struct xfrm_algo *calg;
218 struct xfrm_algo_aead *aead;
219 const char *geniv;
220
221 /* mapping change rate limiting */
222 __be16 new_mapping_sport;
223 u32 new_mapping; /* seconds */
224 u32 mapping_maxage; /* seconds for input SA */
225
226 /* Data for encapsulator */
227 struct xfrm_encap_tmpl *encap;
228 struct sock __rcu *encap_sk;
229
230 /* Data for care-of address */
231 xfrm_address_t *coaddr;
232
233 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
234 struct xfrm_state *tunnel;
235
236 /* If a tunnel, number of users + 1 */
237 atomic_t tunnel_users;
238
239 /* State for replay detection */
240 struct xfrm_replay_state replay;
241 struct xfrm_replay_state_esn *replay_esn;
242
243 /* Replay detection state at the time we sent the last notification */
244 struct xfrm_replay_state preplay;
245 struct xfrm_replay_state_esn *preplay_esn;
246
247 /* replay detection mode */
248 enum xfrm_replay_mode repl_mode;
249 /* internal flag that only holds state for delayed aevent at the
250 * moment
251 */
252 u32 xflags;
253
254 /* Replay detection notification settings */
255 u32 replay_maxage;
256 u32 replay_maxdiff;
257
258 /* Replay detection notification timer */
259 struct timer_list rtimer;
260
261 /* Statistics */
262 struct xfrm_stats stats;
263
264 struct xfrm_lifetime_cur curlft;
265 struct hrtimer mtimer;
266
267 struct xfrm_dev_offload xso;
268
269 /* used to fix curlft->add_time when changing date */
270 long saved_tmo;
271
272 /* Last used time */
273 time64_t lastused;
274
275 struct page_frag xfrag;
276
277 /* Reference to data common to all the instances of this
278 * transformer. */
279 const struct xfrm_type *type;
280 struct xfrm_mode inner_mode;
281 struct xfrm_mode inner_mode_iaf;
282 struct xfrm_mode outer_mode;
283
284 const struct xfrm_type_offload *type_offload;
285
286 /* Security context */
287 struct xfrm_sec_ctx *security;
288
289 /* Private data of this transformer, format is opaque,
290 * interpreted by xfrm_type methods. */
291 void *data;
292};
293
294static inline struct net *xs_net(struct xfrm_state *x)
295{
296 return read_pnet(&x->xs_net);
297}
298
299/* xflags - make enum if more show up */
300#define XFRM_TIME_DEFER 1
301#define XFRM_SOFT_EXPIRE 2
302
303enum {
304 XFRM_STATE_VOID,
305 XFRM_STATE_ACQ,
306 XFRM_STATE_VALID,
307 XFRM_STATE_ERROR,
308 XFRM_STATE_EXPIRED,
309 XFRM_STATE_DEAD
310};
311
312/* callback structure passed from either netlink or pfkey */
313struct km_event {
314 union {
315 u32 hard;
316 u32 proto;
317 u32 byid;
318 u32 aevent;
319 u32 type;
320 } data;
321
322 u32 seq;
323 u32 portid;
324 u32 event;
325 struct net *net;
326};
327
328struct xfrm_if_decode_session_result {
329 struct net *net;
330 u32 if_id;
331};
332
333struct xfrm_if_cb {
334 bool (*decode_session)(struct sk_buff *skb,
335 unsigned short family,
336 struct xfrm_if_decode_session_result *res);
337};
338
339void xfrm_if_register_cb(const struct xfrm_if_cb *ifcb);
340void xfrm_if_unregister_cb(void);
341
342struct net_device;
343struct xfrm_type;
344struct xfrm_dst;
345struct xfrm_policy_afinfo {
346 struct dst_ops *dst_ops;
347 struct dst_entry *(*dst_lookup)(struct net *net,
348 int tos, int oif,
349 const xfrm_address_t *saddr,
350 const xfrm_address_t *daddr,
351 u32 mark);
352 int (*get_saddr)(struct net *net, int oif,
353 xfrm_address_t *saddr,
354 xfrm_address_t *daddr,
355 u32 mark);
356 int (*fill_dst)(struct xfrm_dst *xdst,
357 struct net_device *dev,
358 const struct flowi *fl);
359 struct dst_entry *(*blackhole_route)(struct net *net, struct dst_entry *orig);
360};
361
362int xfrm_policy_register_afinfo(const struct xfrm_policy_afinfo *afinfo, int family);
363void xfrm_policy_unregister_afinfo(const struct xfrm_policy_afinfo *afinfo);
364void km_policy_notify(struct xfrm_policy *xp, int dir,
365 const struct km_event *c);
366void km_state_notify(struct xfrm_state *x, const struct km_event *c);
367
368struct xfrm_tmpl;
369int km_query(struct xfrm_state *x, struct xfrm_tmpl *t,
370 struct xfrm_policy *pol);
371void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
372int __xfrm_state_delete(struct xfrm_state *x);
373
374struct xfrm_state_afinfo {
375 u8 family;
376 u8 proto;
377
378 const struct xfrm_type_offload *type_offload_esp;
379
380 const struct xfrm_type *type_esp;
381 const struct xfrm_type *type_ipip;
382 const struct xfrm_type *type_ipip6;
383 const struct xfrm_type *type_comp;
384 const struct xfrm_type *type_ah;
385 const struct xfrm_type *type_routing;
386 const struct xfrm_type *type_dstopts;
387
388 int (*output)(struct net *net, struct sock *sk, struct sk_buff *skb);
389 int (*transport_finish)(struct sk_buff *skb,
390 int async);
391 void (*local_error)(struct sk_buff *skb, u32 mtu);
392};
393
394int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
395int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
396struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family);
397struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family);
398
399struct xfrm_input_afinfo {
400 u8 family;
401 bool is_ipip;
402 int (*callback)(struct sk_buff *skb, u8 protocol,
403 int err);
404};
405
406int xfrm_input_register_afinfo(const struct xfrm_input_afinfo *afinfo);
407int xfrm_input_unregister_afinfo(const struct xfrm_input_afinfo *afinfo);
408
409void xfrm_flush_gc(void);
410void xfrm_state_delete_tunnel(struct xfrm_state *x);
411
412struct xfrm_type {
413 struct module *owner;
414 u8 proto;
415 u8 flags;
416#define XFRM_TYPE_NON_FRAGMENT 1
417#define XFRM_TYPE_REPLAY_PROT 2
418#define XFRM_TYPE_LOCAL_COADDR 4
419#define XFRM_TYPE_REMOTE_COADDR 8
420
421 int (*init_state)(struct xfrm_state *x,
422 struct netlink_ext_ack *extack);
423 void (*destructor)(struct xfrm_state *);
424 int (*input)(struct xfrm_state *, struct sk_buff *skb);
425 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
426 int (*reject)(struct xfrm_state *, struct sk_buff *,
427 const struct flowi *);
428};
429
430int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
431void xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
432
433struct xfrm_type_offload {
434 struct module *owner;
435 u8 proto;
436 void (*encap)(struct xfrm_state *, struct sk_buff *pskb);
437 int (*input_tail)(struct xfrm_state *x, struct sk_buff *skb);
438 int (*xmit)(struct xfrm_state *, struct sk_buff *pskb, netdev_features_t features);
439};
440
441int xfrm_register_type_offload(const struct xfrm_type_offload *type, unsigned short family);
442void xfrm_unregister_type_offload(const struct xfrm_type_offload *type, unsigned short family);
443
444static inline int xfrm_af2proto(unsigned int family)
445{
446 switch(family) {
447 case AF_INET:
448 return IPPROTO_IPIP;
449 case AF_INET6:
450 return IPPROTO_IPV6;
451 default:
452 return 0;
453 }
454}
455
456static inline const struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
457{
458 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
459 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
460 return &x->inner_mode;
461 else
462 return &x->inner_mode_iaf;
463}
464
465struct xfrm_tmpl {
466/* id in template is interpreted as:
467 * daddr - destination of tunnel, may be zero for transport mode.
468 * spi - zero to acquire spi. Not zero if spi is static, then
469 * daddr must be fixed too.
470 * proto - AH/ESP/IPCOMP
471 */
472 struct xfrm_id id;
473
474/* Source address of tunnel. Ignored, if it is not a tunnel. */
475 xfrm_address_t saddr;
476
477 unsigned short encap_family;
478
479 u32 reqid;
480
481/* Mode: transport, tunnel etc. */
482 u8 mode;
483
484/* Sharing mode: unique, this session only, this user only etc. */
485 u8 share;
486
487/* May skip this transfomration if no SA is found */
488 u8 optional;
489
490/* Skip aalgos/ealgos/calgos checks. */
491 u8 allalgs;
492
493/* Bit mask of algos allowed for acquisition */
494 u32 aalgos;
495 u32 ealgos;
496 u32 calgos;
497};
498
499#define XFRM_MAX_DEPTH 6
500#define XFRM_MAX_OFFLOAD_DEPTH 1
501
502struct xfrm_policy_walk_entry {
503 struct list_head all;
504 u8 dead;
505};
506
507struct xfrm_policy_walk {
508 struct xfrm_policy_walk_entry walk;
509 u8 type;
510 u32 seq;
511};
512
513struct xfrm_policy_queue {
514 struct sk_buff_head hold_queue;
515 struct timer_list hold_timer;
516 unsigned long timeout;
517};
518
519struct xfrm_policy {
520 possible_net_t xp_net;
521 struct hlist_node bydst;
522 struct hlist_node byidx;
523
524 /* This lock only affects elements except for entry. */
525 rwlock_t lock;
526 refcount_t refcnt;
527 u32 pos;
528 struct timer_list timer;
529
530 atomic_t genid;
531 u32 priority;
532 u32 index;
533 u32 if_id;
534 struct xfrm_mark mark;
535 struct xfrm_selector selector;
536 struct xfrm_lifetime_cfg lft;
537 struct xfrm_lifetime_cur curlft;
538 struct xfrm_policy_walk_entry walk;
539 struct xfrm_policy_queue polq;
540 bool bydst_reinsert;
541 u8 type;
542 u8 action;
543 u8 flags;
544 u8 xfrm_nr;
545 u16 family;
546 struct xfrm_sec_ctx *security;
547 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
548 struct hlist_node bydst_inexact_list;
549 struct rcu_head rcu;
550
551 struct xfrm_dev_offload xdo;
552};
553
554static inline struct net *xp_net(const struct xfrm_policy *xp)
555{
556 return read_pnet(&xp->xp_net);
557}
558
559struct xfrm_kmaddress {
560 xfrm_address_t local;
561 xfrm_address_t remote;
562 u32 reserved;
563 u16 family;
564};
565
566struct xfrm_migrate {
567 xfrm_address_t old_daddr;
568 xfrm_address_t old_saddr;
569 xfrm_address_t new_daddr;
570 xfrm_address_t new_saddr;
571 u8 proto;
572 u8 mode;
573 u16 reserved;
574 u32 reqid;
575 u16 old_family;
576 u16 new_family;
577};
578
579#define XFRM_KM_TIMEOUT 30
580/* what happened */
581#define XFRM_REPLAY_UPDATE XFRM_AE_CR
582#define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
583
584/* default aevent timeout in units of 100ms */
585#define XFRM_AE_ETIME 10
586/* Async Event timer multiplier */
587#define XFRM_AE_ETH_M 10
588/* default seq threshold size */
589#define XFRM_AE_SEQT_SIZE 2
590
591struct xfrm_mgr {
592 struct list_head list;
593 int (*notify)(struct xfrm_state *x, const struct km_event *c);
594 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp);
595 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
596 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
597 int (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c);
598 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
599 int (*migrate)(const struct xfrm_selector *sel,
600 u8 dir, u8 type,
601 const struct xfrm_migrate *m,
602 int num_bundles,
603 const struct xfrm_kmaddress *k,
604 const struct xfrm_encap_tmpl *encap);
605 bool (*is_alive)(const struct km_event *c);
606};
607
608void xfrm_register_km(struct xfrm_mgr *km);
609void xfrm_unregister_km(struct xfrm_mgr *km);
610
611struct xfrm_tunnel_skb_cb {
612 union {
613 struct inet_skb_parm h4;
614 struct inet6_skb_parm h6;
615 } header;
616
617 union {
618 struct ip_tunnel *ip4;
619 struct ip6_tnl *ip6;
620 } tunnel;
621};
622
623#define XFRM_TUNNEL_SKB_CB(__skb) ((struct xfrm_tunnel_skb_cb *)&((__skb)->cb[0]))
624
625/*
626 * This structure is used for the duration where packets are being
627 * transformed by IPsec. As soon as the packet leaves IPsec the
628 * area beyond the generic IP part may be overwritten.
629 */
630struct xfrm_skb_cb {
631 struct xfrm_tunnel_skb_cb header;
632
633 /* Sequence number for replay protection. */
634 union {
635 struct {
636 __u32 low;
637 __u32 hi;
638 } output;
639 struct {
640 __be32 low;
641 __be32 hi;
642 } input;
643 } seq;
644};
645
646#define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
647
648/*
649 * This structure is used by the afinfo prepare_input/prepare_output functions
650 * to transmit header information to the mode input/output functions.
651 */
652struct xfrm_mode_skb_cb {
653 struct xfrm_tunnel_skb_cb header;
654
655 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
656 __be16 id;
657 __be16 frag_off;
658
659 /* IP header length (excluding options or extension headers). */
660 u8 ihl;
661
662 /* TOS for IPv4, class for IPv6. */
663 u8 tos;
664
665 /* TTL for IPv4, hop limitfor IPv6. */
666 u8 ttl;
667
668 /* Protocol for IPv4, NH for IPv6. */
669 u8 protocol;
670
671 /* Option length for IPv4, zero for IPv6. */
672 u8 optlen;
673
674 /* Used by IPv6 only, zero for IPv4. */
675 u8 flow_lbl[3];
676};
677
678#define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
679
680/*
681 * This structure is used by the input processing to locate the SPI and
682 * related information.
683 */
684struct xfrm_spi_skb_cb {
685 struct xfrm_tunnel_skb_cb header;
686
687 unsigned int daddroff;
688 unsigned int family;
689 __be32 seq;
690};
691
692#define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
693
694#ifdef CONFIG_AUDITSYSCALL
695static inline struct audit_buffer *xfrm_audit_start(const char *op)
696{
697 struct audit_buffer *audit_buf = NULL;
698
699 if (audit_enabled == AUDIT_OFF)
700 return NULL;
701 audit_buf = audit_log_start(audit_context(), GFP_ATOMIC,
702 AUDIT_MAC_IPSEC_EVENT);
703 if (audit_buf == NULL)
704 return NULL;
705 audit_log_format(audit_buf, "op=%s", op);
706 return audit_buf;
707}
708
709static inline void xfrm_audit_helper_usrinfo(bool task_valid,
710 struct audit_buffer *audit_buf)
711{
712 const unsigned int auid = from_kuid(&init_user_ns, task_valid ?
713 audit_get_loginuid(current) :
714 INVALID_UID);
715 const unsigned int ses = task_valid ? audit_get_sessionid(current) :
716 AUDIT_SID_UNSET;
717
718 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
719 audit_log_task_context(audit_buf);
720}
721
722void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid);
723void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
724 bool task_valid);
725void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid);
726void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid);
727void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
728 struct sk_buff *skb);
729void xfrm_audit_state_replay(struct xfrm_state *x, struct sk_buff *skb,
730 __be32 net_seq);
731void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
732void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, __be32 net_spi,
733 __be32 net_seq);
734void xfrm_audit_state_icvfail(struct xfrm_state *x, struct sk_buff *skb,
735 u8 proto);
736#else
737
738static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
739 bool task_valid)
740{
741}
742
743static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
744 bool task_valid)
745{
746}
747
748static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
749 bool task_valid)
750{
751}
752
753static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
754 bool task_valid)
755{
756}
757
758static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
759 struct sk_buff *skb)
760{
761}
762
763static inline void xfrm_audit_state_replay(struct xfrm_state *x,
764 struct sk_buff *skb, __be32 net_seq)
765{
766}
767
768static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
769 u16 family)
770{
771}
772
773static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
774 __be32 net_spi, __be32 net_seq)
775{
776}
777
778static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
779 struct sk_buff *skb, u8 proto)
780{
781}
782#endif /* CONFIG_AUDITSYSCALL */
783
784static inline void xfrm_pol_hold(struct xfrm_policy *policy)
785{
786 if (likely(policy != NULL))
787 refcount_inc(&policy->refcnt);
788}
789
790void xfrm_policy_destroy(struct xfrm_policy *policy);
791
792static inline void xfrm_pol_put(struct xfrm_policy *policy)
793{
794 if (refcount_dec_and_test(&policy->refcnt))
795 xfrm_policy_destroy(policy);
796}
797
798static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
799{
800 int i;
801 for (i = npols - 1; i >= 0; --i)
802 xfrm_pol_put(pols[i]);
803}
804
805void __xfrm_state_destroy(struct xfrm_state *, bool);
806
807static inline void __xfrm_state_put(struct xfrm_state *x)
808{
809 refcount_dec(&x->refcnt);
810}
811
812static inline void xfrm_state_put(struct xfrm_state *x)
813{
814 if (refcount_dec_and_test(&x->refcnt))
815 __xfrm_state_destroy(x, false);
816}
817
818static inline void xfrm_state_put_sync(struct xfrm_state *x)
819{
820 if (refcount_dec_and_test(&x->refcnt))
821 __xfrm_state_destroy(x, true);
822}
823
824static inline void xfrm_state_hold(struct xfrm_state *x)
825{
826 refcount_inc(&x->refcnt);
827}
828
829static inline bool addr_match(const void *token1, const void *token2,
830 unsigned int prefixlen)
831{
832 const __be32 *a1 = token1;
833 const __be32 *a2 = token2;
834 unsigned int pdw;
835 unsigned int pbi;
836
837 pdw = prefixlen >> 5; /* num of whole u32 in prefix */
838 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
839
840 if (pdw)
841 if (memcmp(a1, a2, pdw << 2))
842 return false;
843
844 if (pbi) {
845 __be32 mask;
846
847 mask = htonl((0xffffffff) << (32 - pbi));
848
849 if ((a1[pdw] ^ a2[pdw]) & mask)
850 return false;
851 }
852
853 return true;
854}
855
856static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen)
857{
858 /* C99 6.5.7 (3): u32 << 32 is undefined behaviour */
859 if (sizeof(long) == 4 && prefixlen == 0)
860 return true;
861 return !((a1 ^ a2) & htonl(~0UL << (32 - prefixlen)));
862}
863
864static __inline__
865__be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli)
866{
867 __be16 port;
868 switch(fl->flowi_proto) {
869 case IPPROTO_TCP:
870 case IPPROTO_UDP:
871 case IPPROTO_UDPLITE:
872 case IPPROTO_SCTP:
873 port = uli->ports.sport;
874 break;
875 case IPPROTO_ICMP:
876 case IPPROTO_ICMPV6:
877 port = htons(uli->icmpt.type);
878 break;
879 case IPPROTO_MH:
880 port = htons(uli->mht.type);
881 break;
882 case IPPROTO_GRE:
883 port = htons(ntohl(uli->gre_key) >> 16);
884 break;
885 default:
886 port = 0; /*XXX*/
887 }
888 return port;
889}
890
891static __inline__
892__be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli)
893{
894 __be16 port;
895 switch(fl->flowi_proto) {
896 case IPPROTO_TCP:
897 case IPPROTO_UDP:
898 case IPPROTO_UDPLITE:
899 case IPPROTO_SCTP:
900 port = uli->ports.dport;
901 break;
902 case IPPROTO_ICMP:
903 case IPPROTO_ICMPV6:
904 port = htons(uli->icmpt.code);
905 break;
906 case IPPROTO_GRE:
907 port = htons(ntohl(uli->gre_key) & 0xffff);
908 break;
909 default:
910 port = 0; /*XXX*/
911 }
912 return port;
913}
914
915bool xfrm_selector_match(const struct xfrm_selector *sel,
916 const struct flowi *fl, unsigned short family);
917
918#ifdef CONFIG_SECURITY_NETWORK_XFRM
919/* If neither has a context --> match
920 * Otherwise, both must have a context and the sids, doi, alg must match
921 */
922static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
923{
924 return ((!s1 && !s2) ||
925 (s1 && s2 &&
926 (s1->ctx_sid == s2->ctx_sid) &&
927 (s1->ctx_doi == s2->ctx_doi) &&
928 (s1->ctx_alg == s2->ctx_alg)));
929}
930#else
931static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
932{
933 return true;
934}
935#endif
936
937/* A struct encoding bundle of transformations to apply to some set of flow.
938 *
939 * xdst->child points to the next element of bundle.
940 * dst->xfrm points to an instanse of transformer.
941 *
942 * Due to unfortunate limitations of current routing cache, which we
943 * have no time to fix, it mirrors struct rtable and bound to the same
944 * routing key, including saddr,daddr. However, we can have many of
945 * bundles differing by session id. All the bundles grow from a parent
946 * policy rule.
947 */
948struct xfrm_dst {
949 union {
950 struct dst_entry dst;
951 struct rtable rt;
952 struct rt6_info rt6;
953 } u;
954 struct dst_entry *route;
955 struct dst_entry *child;
956 struct dst_entry *path;
957 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
958 int num_pols, num_xfrms;
959 u32 xfrm_genid;
960 u32 policy_genid;
961 u32 route_mtu_cached;
962 u32 child_mtu_cached;
963 u32 route_cookie;
964 u32 path_cookie;
965};
966
967static inline struct dst_entry *xfrm_dst_path(const struct dst_entry *dst)
968{
969#ifdef CONFIG_XFRM
970 if (dst->xfrm || (dst->flags & DST_XFRM_QUEUE)) {
971 const struct xfrm_dst *xdst = (const struct xfrm_dst *) dst;
972
973 return xdst->path;
974 }
975#endif
976 return (struct dst_entry *) dst;
977}
978
979static inline struct dst_entry *xfrm_dst_child(const struct dst_entry *dst)
980{
981#ifdef CONFIG_XFRM
982 if (dst->xfrm || (dst->flags & DST_XFRM_QUEUE)) {
983 struct xfrm_dst *xdst = (struct xfrm_dst *) dst;
984 return xdst->child;
985 }
986#endif
987 return NULL;
988}
989
990#ifdef CONFIG_XFRM
991static inline void xfrm_dst_set_child(struct xfrm_dst *xdst, struct dst_entry *child)
992{
993 xdst->child = child;
994}
995
996static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
997{
998 xfrm_pols_put(xdst->pols, xdst->num_pols);
999 dst_release(xdst->route);
1000 if (likely(xdst->u.dst.xfrm))
1001 xfrm_state_put(xdst->u.dst.xfrm);
1002}
1003#endif
1004
1005void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
1006
1007struct xfrm_if_parms {
1008 int link; /* ifindex of underlying L2 interface */
1009 u32 if_id; /* interface identifyer */
1010 bool collect_md;
1011};
1012
1013struct xfrm_if {
1014 struct xfrm_if __rcu *next; /* next interface in list */
1015 struct net_device *dev; /* virtual device associated with interface */
1016 struct net *net; /* netns for packet i/o */
1017 struct xfrm_if_parms p; /* interface parms */
1018
1019 struct gro_cells gro_cells;
1020};
1021
1022struct xfrm_offload {
1023 /* Output sequence number for replay protection on offloading. */
1024 struct {
1025 __u32 low;
1026 __u32 hi;
1027 } seq;
1028
1029 __u32 flags;
1030#define SA_DELETE_REQ 1
1031#define CRYPTO_DONE 2
1032#define CRYPTO_NEXT_DONE 4
1033#define CRYPTO_FALLBACK 8
1034#define XFRM_GSO_SEGMENT 16
1035#define XFRM_GRO 32
1036/* 64 is free */
1037#define XFRM_DEV_RESUME 128
1038#define XFRM_XMIT 256
1039
1040 __u32 status;
1041#define CRYPTO_SUCCESS 1
1042#define CRYPTO_GENERIC_ERROR 2
1043#define CRYPTO_TRANSPORT_AH_AUTH_FAILED 4
1044#define CRYPTO_TRANSPORT_ESP_AUTH_FAILED 8
1045#define CRYPTO_TUNNEL_AH_AUTH_FAILED 16
1046#define CRYPTO_TUNNEL_ESP_AUTH_FAILED 32
1047#define CRYPTO_INVALID_PACKET_SYNTAX 64
1048#define CRYPTO_INVALID_PROTOCOL 128
1049
1050 __u8 proto;
1051 __u8 inner_ipproto;
1052};
1053
1054struct sec_path {
1055 int len;
1056 int olen;
1057 int verified_cnt;
1058
1059 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
1060 struct xfrm_offload ovec[XFRM_MAX_OFFLOAD_DEPTH];
1061};
1062
1063struct sec_path *secpath_set(struct sk_buff *skb);
1064
1065static inline void
1066secpath_reset(struct sk_buff *skb)
1067{
1068#ifdef CONFIG_XFRM
1069 skb_ext_del(skb, SKB_EXT_SEC_PATH);
1070#endif
1071}
1072
1073static inline int
1074xfrm_addr_any(const xfrm_address_t *addr, unsigned short family)
1075{
1076 switch (family) {
1077 case AF_INET:
1078 return addr->a4 == 0;
1079 case AF_INET6:
1080 return ipv6_addr_any(&addr->in6);
1081 }
1082 return 0;
1083}
1084
1085static inline int
1086__xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1087{
1088 return (tmpl->saddr.a4 &&
1089 tmpl->saddr.a4 != x->props.saddr.a4);
1090}
1091
1092static inline int
1093__xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1094{
1095 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
1096 !ipv6_addr_equal((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
1097}
1098
1099static inline int
1100xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family)
1101{
1102 switch (family) {
1103 case AF_INET:
1104 return __xfrm4_state_addr_cmp(tmpl, x);
1105 case AF_INET6:
1106 return __xfrm6_state_addr_cmp(tmpl, x);
1107 }
1108 return !0;
1109}
1110
1111#ifdef CONFIG_XFRM
1112static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1113{
1114 struct sec_path *sp = skb_sec_path(skb);
1115
1116 return sp->xvec[sp->len - 1];
1117}
1118#endif
1119
1120static inline struct xfrm_offload *xfrm_offload(struct sk_buff *skb)
1121{
1122#ifdef CONFIG_XFRM
1123 struct sec_path *sp = skb_sec_path(skb);
1124
1125 if (!sp || !sp->olen || sp->len != sp->olen)
1126 return NULL;
1127
1128 return &sp->ovec[sp->olen - 1];
1129#else
1130 return NULL;
1131#endif
1132}
1133
1134#ifdef CONFIG_XFRM
1135int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb,
1136 unsigned short family);
1137
1138static inline bool __xfrm_check_nopolicy(struct net *net, struct sk_buff *skb,
1139 int dir)
1140{
1141 if (!net->xfrm.policy_count[dir] && !secpath_exists(skb))
1142 return net->xfrm.policy_default[dir] == XFRM_USERPOLICY_ACCEPT;
1143
1144 return false;
1145}
1146
1147static inline bool __xfrm_check_dev_nopolicy(struct sk_buff *skb,
1148 int dir, unsigned short family)
1149{
1150 if (dir != XFRM_POLICY_OUT && family == AF_INET) {
1151 /* same dst may be used for traffic originating from
1152 * devices with different policy settings.
1153 */
1154 return IPCB(skb)->flags & IPSKB_NOPOLICY;
1155 }
1156 return skb_dst(skb) && (skb_dst(skb)->flags & DST_NOPOLICY);
1157}
1158
1159static inline int __xfrm_policy_check2(struct sock *sk, int dir,
1160 struct sk_buff *skb,
1161 unsigned int family, int reverse)
1162{
1163 struct net *net = dev_net(skb->dev);
1164 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
1165 struct xfrm_offload *xo = xfrm_offload(skb);
1166 struct xfrm_state *x;
1167
1168 if (sk && sk->sk_policy[XFRM_POLICY_IN])
1169 return __xfrm_policy_check(sk, ndir, skb, family);
1170
1171 if (xo) {
1172 x = xfrm_input_state(skb);
1173 if (x->xso.type == XFRM_DEV_OFFLOAD_PACKET)
1174 return (xo->flags & CRYPTO_DONE) &&
1175 (xo->status & CRYPTO_SUCCESS);
1176 }
1177
1178 return __xfrm_check_nopolicy(net, skb, dir) ||
1179 __xfrm_check_dev_nopolicy(skb, dir, family) ||
1180 __xfrm_policy_check(sk, ndir, skb, family);
1181}
1182
1183static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1184{
1185 return __xfrm_policy_check2(sk, dir, skb, family, 0);
1186}
1187
1188static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1189{
1190 return xfrm_policy_check(sk, dir, skb, AF_INET);
1191}
1192
1193static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1194{
1195 return xfrm_policy_check(sk, dir, skb, AF_INET6);
1196}
1197
1198static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1199 struct sk_buff *skb)
1200{
1201 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1202}
1203
1204static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1205 struct sk_buff *skb)
1206{
1207 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1208}
1209
1210int __xfrm_decode_session(struct net *net, struct sk_buff *skb, struct flowi *fl,
1211 unsigned int family, int reverse);
1212
1213static inline int xfrm_decode_session(struct net *net, struct sk_buff *skb, struct flowi *fl,
1214 unsigned int family)
1215{
1216 return __xfrm_decode_session(net, skb, fl, family, 0);
1217}
1218
1219static inline int xfrm_decode_session_reverse(struct net *net, struct sk_buff *skb,
1220 struct flowi *fl,
1221 unsigned int family)
1222{
1223 return __xfrm_decode_session(net, skb, fl, family, 1);
1224}
1225
1226int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1227
1228static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1229{
1230 struct net *net = dev_net(skb->dev);
1231
1232 if (!net->xfrm.policy_count[XFRM_POLICY_OUT] &&
1233 net->xfrm.policy_default[XFRM_POLICY_OUT] == XFRM_USERPOLICY_ACCEPT)
1234 return true;
1235
1236 return (skb_dst(skb)->flags & DST_NOXFRM) ||
1237 __xfrm_route_forward(skb, family);
1238}
1239
1240static inline int xfrm4_route_forward(struct sk_buff *skb)
1241{
1242 return xfrm_route_forward(skb, AF_INET);
1243}
1244
1245static inline int xfrm6_route_forward(struct sk_buff *skb)
1246{
1247 return xfrm_route_forward(skb, AF_INET6);
1248}
1249
1250int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk);
1251
1252static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk)
1253{
1254 if (!sk_fullsock(osk))
1255 return 0;
1256 sk->sk_policy[0] = NULL;
1257 sk->sk_policy[1] = NULL;
1258 if (unlikely(osk->sk_policy[0] || osk->sk_policy[1]))
1259 return __xfrm_sk_clone_policy(sk, osk);
1260 return 0;
1261}
1262
1263int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1264
1265static inline void xfrm_sk_free_policy(struct sock *sk)
1266{
1267 struct xfrm_policy *pol;
1268
1269 pol = rcu_dereference_protected(sk->sk_policy[0], 1);
1270 if (unlikely(pol != NULL)) {
1271 xfrm_policy_delete(pol, XFRM_POLICY_MAX);
1272 sk->sk_policy[0] = NULL;
1273 }
1274 pol = rcu_dereference_protected(sk->sk_policy[1], 1);
1275 if (unlikely(pol != NULL)) {
1276 xfrm_policy_delete(pol, XFRM_POLICY_MAX+1);
1277 sk->sk_policy[1] = NULL;
1278 }
1279}
1280
1281#else
1282
1283static inline void xfrm_sk_free_policy(struct sock *sk) {}
1284static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) { return 0; }
1285static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1286static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1287static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1288{
1289 return 1;
1290}
1291static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1292{
1293 return 1;
1294}
1295static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1296{
1297 return 1;
1298}
1299static inline int xfrm_decode_session_reverse(struct net *net, struct sk_buff *skb,
1300 struct flowi *fl,
1301 unsigned int family)
1302{
1303 return -ENOSYS;
1304}
1305static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1306 struct sk_buff *skb)
1307{
1308 return 1;
1309}
1310static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1311 struct sk_buff *skb)
1312{
1313 return 1;
1314}
1315#endif
1316
1317static __inline__
1318xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family)
1319{
1320 switch (family){
1321 case AF_INET:
1322 return (xfrm_address_t *)&fl->u.ip4.daddr;
1323 case AF_INET6:
1324 return (xfrm_address_t *)&fl->u.ip6.daddr;
1325 }
1326 return NULL;
1327}
1328
1329static __inline__
1330xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family)
1331{
1332 switch (family){
1333 case AF_INET:
1334 return (xfrm_address_t *)&fl->u.ip4.saddr;
1335 case AF_INET6:
1336 return (xfrm_address_t *)&fl->u.ip6.saddr;
1337 }
1338 return NULL;
1339}
1340
1341static __inline__
1342void xfrm_flowi_addr_get(const struct flowi *fl,
1343 xfrm_address_t *saddr, xfrm_address_t *daddr,
1344 unsigned short family)
1345{
1346 switch(family) {
1347 case AF_INET:
1348 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4));
1349 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4));
1350 break;
1351 case AF_INET6:
1352 saddr->in6 = fl->u.ip6.saddr;
1353 daddr->in6 = fl->u.ip6.daddr;
1354 break;
1355 }
1356}
1357
1358static __inline__ int
1359__xfrm4_state_addr_check(const struct xfrm_state *x,
1360 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1361{
1362 if (daddr->a4 == x->id.daddr.a4 &&
1363 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1364 return 1;
1365 return 0;
1366}
1367
1368static __inline__ int
1369__xfrm6_state_addr_check(const struct xfrm_state *x,
1370 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1371{
1372 if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1373 (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) ||
1374 ipv6_addr_any((struct in6_addr *)saddr) ||
1375 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1376 return 1;
1377 return 0;
1378}
1379
1380static __inline__ int
1381xfrm_state_addr_check(const struct xfrm_state *x,
1382 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1383 unsigned short family)
1384{
1385 switch (family) {
1386 case AF_INET:
1387 return __xfrm4_state_addr_check(x, daddr, saddr);
1388 case AF_INET6:
1389 return __xfrm6_state_addr_check(x, daddr, saddr);
1390 }
1391 return 0;
1392}
1393
1394static __inline__ int
1395xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl,
1396 unsigned short family)
1397{
1398 switch (family) {
1399 case AF_INET:
1400 return __xfrm4_state_addr_check(x,
1401 (const xfrm_address_t *)&fl->u.ip4.daddr,
1402 (const xfrm_address_t *)&fl->u.ip4.saddr);
1403 case AF_INET6:
1404 return __xfrm6_state_addr_check(x,
1405 (const xfrm_address_t *)&fl->u.ip6.daddr,
1406 (const xfrm_address_t *)&fl->u.ip6.saddr);
1407 }
1408 return 0;
1409}
1410
1411static inline int xfrm_state_kern(const struct xfrm_state *x)
1412{
1413 return atomic_read(&x->tunnel_users);
1414}
1415
1416static inline bool xfrm_id_proto_valid(u8 proto)
1417{
1418 switch (proto) {
1419 case IPPROTO_AH:
1420 case IPPROTO_ESP:
1421 case IPPROTO_COMP:
1422#if IS_ENABLED(CONFIG_IPV6)
1423 case IPPROTO_ROUTING:
1424 case IPPROTO_DSTOPTS:
1425#endif
1426 return true;
1427 default:
1428 return false;
1429 }
1430}
1431
1432/* IPSEC_PROTO_ANY only matches 3 IPsec protocols, 0 could match all. */
1433static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1434{
1435 return (!userproto || proto == userproto ||
1436 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1437 proto == IPPROTO_ESP ||
1438 proto == IPPROTO_COMP)));
1439}
1440
1441/*
1442 * xfrm algorithm information
1443 */
1444struct xfrm_algo_aead_info {
1445 char *geniv;
1446 u16 icv_truncbits;
1447};
1448
1449struct xfrm_algo_auth_info {
1450 u16 icv_truncbits;
1451 u16 icv_fullbits;
1452};
1453
1454struct xfrm_algo_encr_info {
1455 char *geniv;
1456 u16 blockbits;
1457 u16 defkeybits;
1458};
1459
1460struct xfrm_algo_comp_info {
1461 u16 threshold;
1462};
1463
1464struct xfrm_algo_desc {
1465 char *name;
1466 char *compat;
1467 u8 available:1;
1468 u8 pfkey_supported:1;
1469 union {
1470 struct xfrm_algo_aead_info aead;
1471 struct xfrm_algo_auth_info auth;
1472 struct xfrm_algo_encr_info encr;
1473 struct xfrm_algo_comp_info comp;
1474 } uinfo;
1475 struct sadb_alg desc;
1476};
1477
1478/* XFRM protocol handlers. */
1479struct xfrm4_protocol {
1480 int (*handler)(struct sk_buff *skb);
1481 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1482 int encap_type);
1483 int (*cb_handler)(struct sk_buff *skb, int err);
1484 int (*err_handler)(struct sk_buff *skb, u32 info);
1485
1486 struct xfrm4_protocol __rcu *next;
1487 int priority;
1488};
1489
1490struct xfrm6_protocol {
1491 int (*handler)(struct sk_buff *skb);
1492 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1493 int encap_type);
1494 int (*cb_handler)(struct sk_buff *skb, int err);
1495 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1496 u8 type, u8 code, int offset, __be32 info);
1497
1498 struct xfrm6_protocol __rcu *next;
1499 int priority;
1500};
1501
1502/* XFRM tunnel handlers. */
1503struct xfrm_tunnel {
1504 int (*handler)(struct sk_buff *skb);
1505 int (*cb_handler)(struct sk_buff *skb, int err);
1506 int (*err_handler)(struct sk_buff *skb, u32 info);
1507
1508 struct xfrm_tunnel __rcu *next;
1509 int priority;
1510};
1511
1512struct xfrm6_tunnel {
1513 int (*handler)(struct sk_buff *skb);
1514 int (*cb_handler)(struct sk_buff *skb, int err);
1515 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1516 u8 type, u8 code, int offset, __be32 info);
1517 struct xfrm6_tunnel __rcu *next;
1518 int priority;
1519};
1520
1521void xfrm_init(void);
1522void xfrm4_init(void);
1523int xfrm_state_init(struct net *net);
1524void xfrm_state_fini(struct net *net);
1525void xfrm4_state_init(void);
1526void xfrm4_protocol_init(void);
1527#ifdef CONFIG_XFRM
1528int xfrm6_init(void);
1529void xfrm6_fini(void);
1530int xfrm6_state_init(void);
1531void xfrm6_state_fini(void);
1532int xfrm6_protocol_init(void);
1533void xfrm6_protocol_fini(void);
1534#else
1535static inline int xfrm6_init(void)
1536{
1537 return 0;
1538}
1539static inline void xfrm6_fini(void)
1540{
1541 ;
1542}
1543#endif
1544
1545#ifdef CONFIG_XFRM_STATISTICS
1546int xfrm_proc_init(struct net *net);
1547void xfrm_proc_fini(struct net *net);
1548#endif
1549
1550int xfrm_sysctl_init(struct net *net);
1551#ifdef CONFIG_SYSCTL
1552void xfrm_sysctl_fini(struct net *net);
1553#else
1554static inline void xfrm_sysctl_fini(struct net *net)
1555{
1556}
1557#endif
1558
1559void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
1560 struct xfrm_address_filter *filter);
1561int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1562 int (*func)(struct xfrm_state *, int, void*), void *);
1563void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net);
1564struct xfrm_state *xfrm_state_alloc(struct net *net);
1565void xfrm_state_free(struct xfrm_state *x);
1566struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr,
1567 const xfrm_address_t *saddr,
1568 const struct flowi *fl,
1569 struct xfrm_tmpl *tmpl,
1570 struct xfrm_policy *pol, int *err,
1571 unsigned short family, u32 if_id);
1572struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark, u32 if_id,
1573 xfrm_address_t *daddr,
1574 xfrm_address_t *saddr,
1575 unsigned short family,
1576 u8 mode, u8 proto, u32 reqid);
1577struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
1578 unsigned short family);
1579int xfrm_state_check_expire(struct xfrm_state *x);
1580#ifdef CONFIG_XFRM_OFFLOAD
1581static inline void xfrm_dev_state_update_curlft(struct xfrm_state *x)
1582{
1583 struct xfrm_dev_offload *xdo = &x->xso;
1584 struct net_device *dev = xdo->dev;
1585
1586 if (x->xso.type != XFRM_DEV_OFFLOAD_PACKET)
1587 return;
1588
1589 if (dev && dev->xfrmdev_ops &&
1590 dev->xfrmdev_ops->xdo_dev_state_update_curlft)
1591 dev->xfrmdev_ops->xdo_dev_state_update_curlft(x);
1592
1593}
1594#else
1595static inline void xfrm_dev_state_update_curlft(struct xfrm_state *x) {}
1596#endif
1597void xfrm_state_insert(struct xfrm_state *x);
1598int xfrm_state_add(struct xfrm_state *x);
1599int xfrm_state_update(struct xfrm_state *x);
1600struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1601 const xfrm_address_t *daddr, __be32 spi,
1602 u8 proto, unsigned short family);
1603struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1604 const xfrm_address_t *daddr,
1605 const xfrm_address_t *saddr,
1606 u8 proto,
1607 unsigned short family);
1608#ifdef CONFIG_XFRM_SUB_POLICY
1609void xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1610 unsigned short family);
1611void xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1612 unsigned short family);
1613#else
1614static inline void xfrm_tmpl_sort(struct xfrm_tmpl **d, struct xfrm_tmpl **s,
1615 int n, unsigned short family)
1616{
1617}
1618
1619static inline void xfrm_state_sort(struct xfrm_state **d, struct xfrm_state **s,
1620 int n, unsigned short family)
1621{
1622}
1623#endif
1624
1625struct xfrmk_sadinfo {
1626 u32 sadhcnt; /* current hash bkts */
1627 u32 sadhmcnt; /* max allowed hash bkts */
1628 u32 sadcnt; /* current running count */
1629};
1630
1631struct xfrmk_spdinfo {
1632 u32 incnt;
1633 u32 outcnt;
1634 u32 fwdcnt;
1635 u32 inscnt;
1636 u32 outscnt;
1637 u32 fwdscnt;
1638 u32 spdhcnt;
1639 u32 spdhmcnt;
1640};
1641
1642struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1643int xfrm_state_delete(struct xfrm_state *x);
1644int xfrm_state_flush(struct net *net, u8 proto, bool task_valid, bool sync);
1645int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid);
1646int xfrm_dev_policy_flush(struct net *net, struct net_device *dev,
1647 bool task_valid);
1648void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1649void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1650u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq);
1651int xfrm_init_replay(struct xfrm_state *x, struct netlink_ext_ack *extack);
1652u32 xfrm_state_mtu(struct xfrm_state *x, int mtu);
1653int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload,
1654 struct netlink_ext_ack *extack);
1655int xfrm_init_state(struct xfrm_state *x);
1656int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type);
1657int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1658int xfrm_trans_queue_net(struct net *net, struct sk_buff *skb,
1659 int (*finish)(struct net *, struct sock *,
1660 struct sk_buff *));
1661int xfrm_trans_queue(struct sk_buff *skb,
1662 int (*finish)(struct net *, struct sock *,
1663 struct sk_buff *));
1664int xfrm_output_resume(struct sock *sk, struct sk_buff *skb, int err);
1665int xfrm_output(struct sock *sk, struct sk_buff *skb);
1666
1667#if IS_ENABLED(CONFIG_NET_PKTGEN)
1668int pktgen_xfrm_outer_mode_output(struct xfrm_state *x, struct sk_buff *skb);
1669#endif
1670
1671void xfrm_local_error(struct sk_buff *skb, int mtu);
1672int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1673 int encap_type);
1674int xfrm4_transport_finish(struct sk_buff *skb, int async);
1675int xfrm4_rcv(struct sk_buff *skb);
1676
1677static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1678{
1679 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
1680 XFRM_SPI_SKB_CB(skb)->family = AF_INET;
1681 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
1682 return xfrm_input(skb, nexthdr, spi, 0);
1683}
1684
1685int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1686int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol);
1687int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol);
1688int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1689int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1690void xfrm4_local_error(struct sk_buff *skb, u32 mtu);
1691int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi,
1692 struct ip6_tnl *t);
1693int xfrm6_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1694 int encap_type);
1695int xfrm6_transport_finish(struct sk_buff *skb, int async);
1696int xfrm6_rcv_tnl(struct sk_buff *skb, struct ip6_tnl *t);
1697int xfrm6_rcv(struct sk_buff *skb);
1698int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1699 xfrm_address_t *saddr, u8 proto);
1700void xfrm6_local_error(struct sk_buff *skb, u32 mtu);
1701int xfrm6_protocol_register(struct xfrm6_protocol *handler, unsigned char protocol);
1702int xfrm6_protocol_deregister(struct xfrm6_protocol *handler, unsigned char protocol);
1703int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1704int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1705__be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1706__be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr);
1707int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1708
1709#ifdef CONFIG_XFRM
1710void xfrm6_local_rxpmtu(struct sk_buff *skb, u32 mtu);
1711int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1712int xfrm6_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1713struct sk_buff *xfrm4_gro_udp_encap_rcv(struct sock *sk, struct list_head *head,
1714 struct sk_buff *skb);
1715struct sk_buff *xfrm6_gro_udp_encap_rcv(struct sock *sk, struct list_head *head,
1716 struct sk_buff *skb);
1717int xfrm_user_policy(struct sock *sk, int optname, sockptr_t optval,
1718 int optlen);
1719#else
1720static inline int xfrm_user_policy(struct sock *sk, int optname,
1721 sockptr_t optval, int optlen)
1722{
1723 return -ENOPROTOOPT;
1724}
1725#endif
1726
1727struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, int oif,
1728 const xfrm_address_t *saddr,
1729 const xfrm_address_t *daddr,
1730 int family, u32 mark);
1731
1732struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1733
1734void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1735int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1736 int (*func)(struct xfrm_policy *, int, int, void*),
1737 void *);
1738void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net);
1739int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1740struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net,
1741 const struct xfrm_mark *mark,
1742 u32 if_id, u8 type, int dir,
1743 struct xfrm_selector *sel,
1744 struct xfrm_sec_ctx *ctx, int delete,
1745 int *err);
1746struct xfrm_policy *xfrm_policy_byid(struct net *net,
1747 const struct xfrm_mark *mark, u32 if_id,
1748 u8 type, int dir, u32 id, int delete,
1749 int *err);
1750int xfrm_policy_flush(struct net *net, u8 type, bool task_valid);
1751void xfrm_policy_hash_rebuild(struct net *net);
1752u32 xfrm_get_acqseq(void);
1753int verify_spi_info(u8 proto, u32 min, u32 max, struct netlink_ext_ack *extack);
1754int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi,
1755 struct netlink_ext_ack *extack);
1756struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark,
1757 u8 mode, u32 reqid, u32 if_id, u8 proto,
1758 const xfrm_address_t *daddr,
1759 const xfrm_address_t *saddr, int create,
1760 unsigned short family);
1761int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1762
1763#ifdef CONFIG_XFRM_MIGRATE
1764int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1765 const struct xfrm_migrate *m, int num_bundles,
1766 const struct xfrm_kmaddress *k,
1767 const struct xfrm_encap_tmpl *encap);
1768struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net,
1769 u32 if_id);
1770struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1771 struct xfrm_migrate *m,
1772 struct xfrm_encap_tmpl *encap);
1773int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1774 struct xfrm_migrate *m, int num_bundles,
1775 struct xfrm_kmaddress *k, struct net *net,
1776 struct xfrm_encap_tmpl *encap, u32 if_id,
1777 struct netlink_ext_ack *extack);
1778#endif
1779
1780int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1781void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid);
1782int km_report(struct net *net, u8 proto, struct xfrm_selector *sel,
1783 xfrm_address_t *addr);
1784
1785void xfrm_input_init(void);
1786int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1787
1788void xfrm_probe_algs(void);
1789int xfrm_count_pfkey_auth_supported(void);
1790int xfrm_count_pfkey_enc_supported(void);
1791struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1792struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1793struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1794struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1795struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1796struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe);
1797struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe);
1798struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe);
1799struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len,
1800 int probe);
1801
1802static inline bool xfrm6_addr_equal(const xfrm_address_t *a,
1803 const xfrm_address_t *b)
1804{
1805 return ipv6_addr_equal((const struct in6_addr *)a,
1806 (const struct in6_addr *)b);
1807}
1808
1809static inline bool xfrm_addr_equal(const xfrm_address_t *a,
1810 const xfrm_address_t *b,
1811 sa_family_t family)
1812{
1813 switch (family) {
1814 default:
1815 case AF_INET:
1816 return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0;
1817 case AF_INET6:
1818 return xfrm6_addr_equal(a, b);
1819 }
1820}
1821
1822static inline int xfrm_policy_id2dir(u32 index)
1823{
1824 return index & 7;
1825}
1826
1827#ifdef CONFIG_XFRM
1828void xfrm_replay_advance(struct xfrm_state *x, __be32 net_seq);
1829int xfrm_replay_check(struct xfrm_state *x, struct sk_buff *skb, __be32 net_seq);
1830void xfrm_replay_notify(struct xfrm_state *x, int event);
1831int xfrm_replay_overflow(struct xfrm_state *x, struct sk_buff *skb);
1832int xfrm_replay_recheck(struct xfrm_state *x, struct sk_buff *skb, __be32 net_seq);
1833
1834static inline int xfrm_aevent_is_on(struct net *net)
1835{
1836 struct sock *nlsk;
1837 int ret = 0;
1838
1839 rcu_read_lock();
1840 nlsk = rcu_dereference(net->xfrm.nlsk);
1841 if (nlsk)
1842 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1843 rcu_read_unlock();
1844 return ret;
1845}
1846
1847static inline int xfrm_acquire_is_on(struct net *net)
1848{
1849 struct sock *nlsk;
1850 int ret = 0;
1851
1852 rcu_read_lock();
1853 nlsk = rcu_dereference(net->xfrm.nlsk);
1854 if (nlsk)
1855 ret = netlink_has_listeners(nlsk, XFRMNLGRP_ACQUIRE);
1856 rcu_read_unlock();
1857
1858 return ret;
1859}
1860#endif
1861
1862static inline unsigned int aead_len(struct xfrm_algo_aead *alg)
1863{
1864 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1865}
1866
1867static inline unsigned int xfrm_alg_len(const struct xfrm_algo *alg)
1868{
1869 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1870}
1871
1872static inline unsigned int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg)
1873{
1874 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1875}
1876
1877static inline unsigned int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn)
1878{
1879 return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32);
1880}
1881
1882#ifdef CONFIG_XFRM_MIGRATE
1883static inline int xfrm_replay_clone(struct xfrm_state *x,
1884 struct xfrm_state *orig)
1885{
1886
1887 x->replay_esn = kmemdup(orig->replay_esn,
1888 xfrm_replay_state_esn_len(orig->replay_esn),
1889 GFP_KERNEL);
1890 if (!x->replay_esn)
1891 return -ENOMEM;
1892 x->preplay_esn = kmemdup(orig->preplay_esn,
1893 xfrm_replay_state_esn_len(orig->preplay_esn),
1894 GFP_KERNEL);
1895 if (!x->preplay_esn)
1896 return -ENOMEM;
1897
1898 return 0;
1899}
1900
1901static inline struct xfrm_algo_aead *xfrm_algo_aead_clone(struct xfrm_algo_aead *orig)
1902{
1903 return kmemdup(orig, aead_len(orig), GFP_KERNEL);
1904}
1905
1906
1907static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1908{
1909 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1910}
1911
1912static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1913{
1914 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1915}
1916
1917static inline void xfrm_states_put(struct xfrm_state **states, int n)
1918{
1919 int i;
1920 for (i = 0; i < n; i++)
1921 xfrm_state_put(*(states + i));
1922}
1923
1924static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1925{
1926 int i;
1927 for (i = 0; i < n; i++)
1928 xfrm_state_delete(*(states + i));
1929}
1930#endif
1931
1932void __init xfrm_dev_init(void);
1933
1934#ifdef CONFIG_XFRM_OFFLOAD
1935void xfrm_dev_resume(struct sk_buff *skb);
1936void xfrm_dev_backlog(struct softnet_data *sd);
1937struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again);
1938int xfrm_dev_state_add(struct net *net, struct xfrm_state *x,
1939 struct xfrm_user_offload *xuo,
1940 struct netlink_ext_ack *extack);
1941int xfrm_dev_policy_add(struct net *net, struct xfrm_policy *xp,
1942 struct xfrm_user_offload *xuo, u8 dir,
1943 struct netlink_ext_ack *extack);
1944bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x);
1945
1946static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
1947{
1948 struct xfrm_dev_offload *xso = &x->xso;
1949
1950 if (xso->dev && xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn)
1951 xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn(x);
1952}
1953
1954static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
1955{
1956 struct xfrm_state *x = dst->xfrm;
1957 struct xfrm_dst *xdst;
1958
1959 if (!x || !x->type_offload)
1960 return false;
1961
1962 xdst = (struct xfrm_dst *) dst;
1963 if (!x->xso.offload_handle && !xdst->child->xfrm)
1964 return true;
1965 if (x->xso.offload_handle && (x->xso.dev == xfrm_dst_path(dst)->dev) &&
1966 !xdst->child->xfrm)
1967 return true;
1968
1969 return false;
1970}
1971
1972static inline void xfrm_dev_state_delete(struct xfrm_state *x)
1973{
1974 struct xfrm_dev_offload *xso = &x->xso;
1975
1976 if (xso->dev)
1977 xso->dev->xfrmdev_ops->xdo_dev_state_delete(x);
1978}
1979
1980static inline void xfrm_dev_state_free(struct xfrm_state *x)
1981{
1982 struct xfrm_dev_offload *xso = &x->xso;
1983 struct net_device *dev = xso->dev;
1984
1985 if (dev && dev->xfrmdev_ops) {
1986 if (dev->xfrmdev_ops->xdo_dev_state_free)
1987 dev->xfrmdev_ops->xdo_dev_state_free(x);
1988 xso->dev = NULL;
1989 xso->type = XFRM_DEV_OFFLOAD_UNSPECIFIED;
1990 netdev_put(dev, &xso->dev_tracker);
1991 }
1992}
1993
1994static inline void xfrm_dev_policy_delete(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 && dev->xfrmdev_ops->xdo_dev_policy_delete)
2000 dev->xfrmdev_ops->xdo_dev_policy_delete(x);
2001}
2002
2003static inline void xfrm_dev_policy_free(struct xfrm_policy *x)
2004{
2005 struct xfrm_dev_offload *xdo = &x->xdo;
2006 struct net_device *dev = xdo->dev;
2007
2008 if (dev && dev->xfrmdev_ops) {
2009 if (dev->xfrmdev_ops->xdo_dev_policy_free)
2010 dev->xfrmdev_ops->xdo_dev_policy_free(x);
2011 xdo->dev = NULL;
2012 netdev_put(dev, &xdo->dev_tracker);
2013 }
2014}
2015#else
2016static inline void xfrm_dev_resume(struct sk_buff *skb)
2017{
2018}
2019
2020static inline void xfrm_dev_backlog(struct softnet_data *sd)
2021{
2022}
2023
2024static inline struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again)
2025{
2026 return skb;
2027}
2028
2029static inline int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, struct xfrm_user_offload *xuo, struct netlink_ext_ack *extack)
2030{
2031 return 0;
2032}
2033
2034static inline void xfrm_dev_state_delete(struct xfrm_state *x)
2035{
2036}
2037
2038static inline void xfrm_dev_state_free(struct xfrm_state *x)
2039{
2040}
2041
2042static inline int xfrm_dev_policy_add(struct net *net, struct xfrm_policy *xp,
2043 struct xfrm_user_offload *xuo, u8 dir,
2044 struct netlink_ext_ack *extack)
2045{
2046 return 0;
2047}
2048
2049static inline void xfrm_dev_policy_delete(struct xfrm_policy *x)
2050{
2051}
2052
2053static inline void xfrm_dev_policy_free(struct xfrm_policy *x)
2054{
2055}
2056
2057static inline bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x)
2058{
2059 return false;
2060}
2061
2062static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
2063{
2064}
2065
2066static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
2067{
2068 return false;
2069}
2070#endif
2071
2072static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
2073{
2074 if (attrs[XFRMA_MARK])
2075 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark));
2076 else
2077 m->v = m->m = 0;
2078
2079 return m->v & m->m;
2080}
2081
2082static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m)
2083{
2084 int ret = 0;
2085
2086 if (m->m | m->v)
2087 ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
2088 return ret;
2089}
2090
2091static inline __u32 xfrm_smark_get(__u32 mark, struct xfrm_state *x)
2092{
2093 struct xfrm_mark *m = &x->props.smark;
2094
2095 return (m->v & m->m) | (mark & ~m->m);
2096}
2097
2098static inline int xfrm_if_id_put(struct sk_buff *skb, __u32 if_id)
2099{
2100 int ret = 0;
2101
2102 if (if_id)
2103 ret = nla_put_u32(skb, XFRMA_IF_ID, if_id);
2104 return ret;
2105}
2106
2107static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x,
2108 unsigned int family)
2109{
2110 bool tunnel = false;
2111
2112 switch(family) {
2113 case AF_INET:
2114 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4)
2115 tunnel = true;
2116 break;
2117 case AF_INET6:
2118 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6)
2119 tunnel = true;
2120 break;
2121 }
2122 if (tunnel && !(x->outer_mode.flags & XFRM_MODE_FLAG_TUNNEL))
2123 return -EINVAL;
2124
2125 return 0;
2126}
2127
2128extern const int xfrm_msg_min[XFRM_NR_MSGTYPES];
2129extern const struct nla_policy xfrma_policy[XFRMA_MAX+1];
2130
2131struct xfrm_translator {
2132 /* Allocate frag_list and put compat translation there */
2133 int (*alloc_compat)(struct sk_buff *skb, const struct nlmsghdr *src);
2134
2135 /* Allocate nlmsg with 64-bit translaton of received 32-bit message */
2136 struct nlmsghdr *(*rcv_msg_compat)(const struct nlmsghdr *nlh,
2137 int maxtype, const struct nla_policy *policy,
2138 struct netlink_ext_ack *extack);
2139
2140 /* Translate 32-bit user_policy from sockptr */
2141 int (*xlate_user_policy_sockptr)(u8 **pdata32, int optlen);
2142
2143 struct module *owner;
2144};
2145
2146#if IS_ENABLED(CONFIG_XFRM_USER_COMPAT)
2147extern int xfrm_register_translator(struct xfrm_translator *xtr);
2148extern int xfrm_unregister_translator(struct xfrm_translator *xtr);
2149extern struct xfrm_translator *xfrm_get_translator(void);
2150extern void xfrm_put_translator(struct xfrm_translator *xtr);
2151#else
2152static inline struct xfrm_translator *xfrm_get_translator(void)
2153{
2154 return NULL;
2155}
2156static inline void xfrm_put_translator(struct xfrm_translator *xtr)
2157{
2158}
2159#endif
2160
2161#if IS_ENABLED(CONFIG_IPV6)
2162static inline bool xfrm6_local_dontfrag(const struct sock *sk)
2163{
2164 int proto;
2165
2166 if (!sk || sk->sk_family != AF_INET6)
2167 return false;
2168
2169 proto = sk->sk_protocol;
2170 if (proto == IPPROTO_UDP || proto == IPPROTO_RAW)
2171 return inet6_test_bit(DONTFRAG, sk);
2172
2173 return false;
2174}
2175#endif
2176
2177#if (IS_BUILTIN(CONFIG_XFRM_INTERFACE) && IS_ENABLED(CONFIG_DEBUG_INFO_BTF)) || \
2178 (IS_MODULE(CONFIG_XFRM_INTERFACE) && IS_ENABLED(CONFIG_DEBUG_INFO_BTF_MODULES))
2179
2180extern struct metadata_dst __percpu *xfrm_bpf_md_dst;
2181
2182int register_xfrm_interface_bpf(void);
2183
2184#else
2185
2186static inline int register_xfrm_interface_bpf(void)
2187{
2188 return 0;
2189}
2190
2191#endif
2192
2193#if IS_ENABLED(CONFIG_DEBUG_INFO_BTF)
2194int register_xfrm_state_bpf(void);
2195#else
2196static inline int register_xfrm_state_bpf(void)
2197{
2198 return 0;
2199}
2200#endif
2201
2202#endif /* _NET_XFRM_H */