1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
2 #ifndef _LINUX_XFRM_H
3 #define _LINUX_XFRM_H
4 
5 #include <linux/in6.h>
6 #include <linux/types.h>
7 
8 /* All of the structures in this file may not change size as they are
9  * passed into the kernel from userspace via netlink sockets.
10  */
11 
12 /* Structure to encapsulate addresses. I do not want to use
13  * "standard" structure. My apologies.
14  */
15 typedef union {
16 	__be32		a4;
17 	__be32		a6[4];
18 	struct in6_addr	in6;
19 } xfrm_address_t;
20 
21 /* Ident of a specific xfrm_state. It is used on input to lookup
22  * the state by (spi,daddr,ah/esp) or to store information about
23  * spi, protocol and tunnel address on output.
24  */
25 struct xfrm_id {
26 	xfrm_address_t	daddr;
27 	__be32		spi;
28 	__u8		proto;
29 };
30 
31 struct xfrm_sec_ctx {
32 	__u8	ctx_doi;
33 	__u8	ctx_alg;
34 	__u16	ctx_len;
35 	__u32	ctx_sid;
36 	char	ctx_str[];
37 };
38 
39 /* Security Context Domains of Interpretation */
40 #define XFRM_SC_DOI_RESERVED 0
41 #define XFRM_SC_DOI_LSM 1
42 
43 /* Security Context Algorithms */
44 #define XFRM_SC_ALG_RESERVED 0
45 #define XFRM_SC_ALG_SELINUX 1
46 
47 /* Selector, used as selector both on policy rules (SPD) and SAs. */
48 
49 struct xfrm_selector {
50 	xfrm_address_t	daddr;
51 	xfrm_address_t	saddr;
52 	__be16	dport;
53 	__be16	dport_mask;
54 	__be16	sport;
55 	__be16	sport_mask;
56 	__u16	family;
57 	__u8	prefixlen_d;
58 	__u8	prefixlen_s;
59 	__u8	proto;
60 	int	ifindex;
61 	__kernel_uid32_t	user;
62 };
63 
64 #define XFRM_INF (~(__u64)0)
65 
66 struct xfrm_lifetime_cfg {
67 	__u64	soft_byte_limit;
68 	__u64	hard_byte_limit;
69 	__u64	soft_packet_limit;
70 	__u64	hard_packet_limit;
71 	__u64	soft_add_expires_seconds;
72 	__u64	hard_add_expires_seconds;
73 	__u64	soft_use_expires_seconds;
74 	__u64	hard_use_expires_seconds;
75 };
76 
77 struct xfrm_lifetime_cur {
78 	__u64	bytes;
79 	__u64	packets;
80 	__u64	add_time;
81 	__u64	use_time;
82 };
83 
84 struct xfrm_replay_state {
85 	__u32	oseq;
86 	__u32	seq;
87 	__u32	bitmap;
88 };
89 
90 #define XFRMA_REPLAY_ESN_MAX	4096
91 
92 struct xfrm_replay_state_esn {
93 	unsigned int	bmp_len;
94 	__u32		oseq;
95 	__u32		seq;
96 	__u32		oseq_hi;
97 	__u32		seq_hi;
98 	__u32		replay_window;
99 	__u32		bmp[];
100 };
101 
102 struct xfrm_algo {
103 	char		alg_name[64];
104 	unsigned int	alg_key_len;    /* in bits */
105 	char		alg_key[];
106 };
107 
108 struct xfrm_algo_auth {
109 	char		alg_name[64];
110 	unsigned int	alg_key_len;    /* in bits */
111 	unsigned int	alg_trunc_len;  /* in bits */
112 	char		alg_key[];
113 };
114 
115 struct xfrm_algo_aead {
116 	char		alg_name[64];
117 	unsigned int	alg_key_len;	/* in bits */
118 	unsigned int	alg_icv_len;	/* in bits */
119 	char		alg_key[];
120 };
121 
122 struct xfrm_stats {
123 	__u32	replay_window;
124 	__u32	replay;
125 	__u32	integrity_failed;
126 };
127 
128 enum {
129 	XFRM_POLICY_TYPE_MAIN	= 0,
130 	XFRM_POLICY_TYPE_SUB	= 1,
131 	XFRM_POLICY_TYPE_MAX	= 2,
132 	XFRM_POLICY_TYPE_ANY	= 255
133 };
134 
135 enum {
136 	XFRM_POLICY_IN	= 0,
137 	XFRM_POLICY_OUT	= 1,
138 	XFRM_POLICY_FWD	= 2,
139 	XFRM_POLICY_MASK = 3,
140 	XFRM_POLICY_MAX	= 3
141 };
142 
143 enum {
144 	XFRM_SHARE_ANY,		/* No limitations */
145 	XFRM_SHARE_SESSION,	/* For this session only */
146 	XFRM_SHARE_USER,	/* For this user only */
147 	XFRM_SHARE_UNIQUE	/* Use once */
148 };
149 
150 #define XFRM_MODE_TRANSPORT 0
151 #define XFRM_MODE_TUNNEL 1
152 #define XFRM_MODE_ROUTEOPTIMIZATION 2
153 #define XFRM_MODE_IN_TRIGGER 3
154 #define XFRM_MODE_BEET 4
155 #define XFRM_MODE_MAX 5
156 
157 /* Netlink configuration messages.  */
158 enum {
159 	XFRM_MSG_BASE = 0x10,
160 
161 	XFRM_MSG_NEWSA = 0x10,
162 #define XFRM_MSG_NEWSA XFRM_MSG_NEWSA
163 	XFRM_MSG_DELSA,
164 #define XFRM_MSG_DELSA XFRM_MSG_DELSA
165 	XFRM_MSG_GETSA,
166 #define XFRM_MSG_GETSA XFRM_MSG_GETSA
167 
168 	XFRM_MSG_NEWPOLICY,
169 #define XFRM_MSG_NEWPOLICY XFRM_MSG_NEWPOLICY
170 	XFRM_MSG_DELPOLICY,
171 #define XFRM_MSG_DELPOLICY XFRM_MSG_DELPOLICY
172 	XFRM_MSG_GETPOLICY,
173 #define XFRM_MSG_GETPOLICY XFRM_MSG_GETPOLICY
174 
175 	XFRM_MSG_ALLOCSPI,
176 #define XFRM_MSG_ALLOCSPI XFRM_MSG_ALLOCSPI
177 	XFRM_MSG_ACQUIRE,
178 #define XFRM_MSG_ACQUIRE XFRM_MSG_ACQUIRE
179 	XFRM_MSG_EXPIRE,
180 #define XFRM_MSG_EXPIRE XFRM_MSG_EXPIRE
181 
182 	XFRM_MSG_UPDPOLICY,
183 #define XFRM_MSG_UPDPOLICY XFRM_MSG_UPDPOLICY
184 	XFRM_MSG_UPDSA,
185 #define XFRM_MSG_UPDSA XFRM_MSG_UPDSA
186 
187 	XFRM_MSG_POLEXPIRE,
188 #define XFRM_MSG_POLEXPIRE XFRM_MSG_POLEXPIRE
189 
190 	XFRM_MSG_FLUSHSA,
191 #define XFRM_MSG_FLUSHSA XFRM_MSG_FLUSHSA
192 	XFRM_MSG_FLUSHPOLICY,
193 #define XFRM_MSG_FLUSHPOLICY XFRM_MSG_FLUSHPOLICY
194 
195 	XFRM_MSG_NEWAE,
196 #define XFRM_MSG_NEWAE XFRM_MSG_NEWAE
197 	XFRM_MSG_GETAE,
198 #define XFRM_MSG_GETAE XFRM_MSG_GETAE
199 
200 	XFRM_MSG_REPORT,
201 #define XFRM_MSG_REPORT XFRM_MSG_REPORT
202 
203 	XFRM_MSG_MIGRATE,
204 #define XFRM_MSG_MIGRATE XFRM_MSG_MIGRATE
205 
206 	XFRM_MSG_NEWSADINFO,
207 #define XFRM_MSG_NEWSADINFO XFRM_MSG_NEWSADINFO
208 	XFRM_MSG_GETSADINFO,
209 #define XFRM_MSG_GETSADINFO XFRM_MSG_GETSADINFO
210 
211 	XFRM_MSG_NEWSPDINFO,
212 #define XFRM_MSG_NEWSPDINFO XFRM_MSG_NEWSPDINFO
213 	XFRM_MSG_GETSPDINFO,
214 #define XFRM_MSG_GETSPDINFO XFRM_MSG_GETSPDINFO
215 
216 	XFRM_MSG_MAPPING,
217 #define XFRM_MSG_MAPPING XFRM_MSG_MAPPING
218 
219 	XFRM_MSG_SETDEFAULT,
220 #define XFRM_MSG_SETDEFAULT XFRM_MSG_SETDEFAULT
221 	XFRM_MSG_GETDEFAULT,
222 #define XFRM_MSG_GETDEFAULT XFRM_MSG_GETDEFAULT
223 	__XFRM_MSG_MAX
224 };
225 #define XFRM_MSG_MAX (__XFRM_MSG_MAX - 1)
226 
227 #define XFRM_NR_MSGTYPES (XFRM_MSG_MAX + 1 - XFRM_MSG_BASE)
228 
229 /*
230  * Generic LSM security context for comunicating to user space
231  * NOTE: Same format as sadb_x_sec_ctx
232  */
233 struct xfrm_user_sec_ctx {
234 	__u16			len;
235 	__u16			exttype;
236 	__u8			ctx_alg;  /* LSMs: e.g., selinux == 1 */
237 	__u8			ctx_doi;
238 	__u16			ctx_len;
239 };
240 
241 struct xfrm_user_tmpl {
242 	struct xfrm_id		id;
243 	__u16			family;
244 	xfrm_address_t		saddr;
245 	__u32			reqid;
246 	__u8			mode;
247 	__u8			share;
248 	__u8			optional;
249 	__u32			aalgos;
250 	__u32			ealgos;
251 	__u32			calgos;
252 };
253 
254 struct xfrm_encap_tmpl {
255 	__u16		encap_type;
256 	__be16		encap_sport;
257 	__be16		encap_dport;
258 	xfrm_address_t	encap_oa;
259 };
260 
261 /* AEVENT flags  */
262 enum xfrm_ae_ftype_t {
263 	XFRM_AE_UNSPEC,
264 	XFRM_AE_RTHR=1,	/* replay threshold*/
265 	XFRM_AE_RVAL=2, /* replay value */
266 	XFRM_AE_LVAL=4, /* lifetime value */
267 	XFRM_AE_ETHR=8, /* expiry timer threshold */
268 	XFRM_AE_CR=16, /* Event cause is replay update */
269 	XFRM_AE_CE=32, /* Event cause is timer expiry */
270 	XFRM_AE_CU=64, /* Event cause is policy update */
271 	__XFRM_AE_MAX
272 
273 #define XFRM_AE_MAX (__XFRM_AE_MAX - 1)
274 };
275 
276 struct xfrm_userpolicy_type {
277 	__u8		type;
278 	__u16		reserved1;
279 	__u8		reserved2;
280 };
281 
282 /* Netlink message attributes.  */
283 enum xfrm_attr_type_t {
284 	XFRMA_UNSPEC,
285 	XFRMA_ALG_AUTH,		/* struct xfrm_algo */
286 	XFRMA_ALG_CRYPT,	/* struct xfrm_algo */
287 	XFRMA_ALG_COMP,		/* struct xfrm_algo */
288 	XFRMA_ENCAP,		/* struct xfrm_algo + struct xfrm_encap_tmpl */
289 	XFRMA_TMPL,		/* 1 or more struct xfrm_user_tmpl */
290 	XFRMA_SA,		/* struct xfrm_usersa_info  */
291 	XFRMA_POLICY,		/*struct xfrm_userpolicy_info */
292 	XFRMA_SEC_CTX,		/* struct xfrm_sec_ctx */
293 	XFRMA_LTIME_VAL,
294 	XFRMA_REPLAY_VAL,
295 	XFRMA_REPLAY_THRESH,
296 	XFRMA_ETIMER_THRESH,
297 	XFRMA_SRCADDR,		/* xfrm_address_t */
298 	XFRMA_COADDR,		/* xfrm_address_t */
299 	XFRMA_LASTUSED,		/* __u64 */
300 	XFRMA_POLICY_TYPE,	/* struct xfrm_userpolicy_type */
301 	XFRMA_MIGRATE,
302 	XFRMA_ALG_AEAD,		/* struct xfrm_algo_aead */
303 	XFRMA_KMADDRESS,        /* struct xfrm_user_kmaddress */
304 	XFRMA_ALG_AUTH_TRUNC,	/* struct xfrm_algo_auth */
305 	XFRMA_MARK,		/* struct xfrm_mark */
306 	XFRMA_TFCPAD,		/* __u32 */
307 	XFRMA_REPLAY_ESN_VAL,	/* struct xfrm_replay_state_esn */
308 	XFRMA_SA_EXTRA_FLAGS,	/* __u32 */
309 	XFRMA_PROTO,		/* __u8 */
310 	XFRMA_ADDRESS_FILTER,	/* struct xfrm_address_filter */
311 	XFRMA_PAD,
312 	XFRMA_OFFLOAD_DEV,	/* struct xfrm_user_offload */
313 	XFRMA_SET_MARK,		/* __u32 */
314 	XFRMA_SET_MARK_MASK,	/* __u32 */
315 	XFRMA_IF_ID,		/* __u32 */
316 	XFRMA_MTIMER_THRESH,	/* __u32 in seconds for input SA */
317 	__XFRMA_MAX
318 
319 #define XFRMA_OUTPUT_MARK XFRMA_SET_MARK	/* Compatibility */
320 #define XFRMA_MAX (__XFRMA_MAX - 1)
321 };
322 
323 struct xfrm_mark {
324 	__u32           v; /* value */
325 	__u32           m; /* mask */
326 };
327 
328 enum xfrm_sadattr_type_t {
329 	XFRMA_SAD_UNSPEC,
330 	XFRMA_SAD_CNT,
331 	XFRMA_SAD_HINFO,
332 	__XFRMA_SAD_MAX
333 
334 #define XFRMA_SAD_MAX (__XFRMA_SAD_MAX - 1)
335 };
336 
337 struct xfrmu_sadhinfo {
338 	__u32 sadhcnt; /* current hash bkts */
339 	__u32 sadhmcnt; /* max allowed hash bkts */
340 };
341 
342 enum xfrm_spdattr_type_t {
343 	XFRMA_SPD_UNSPEC,
344 	XFRMA_SPD_INFO,
345 	XFRMA_SPD_HINFO,
346 	XFRMA_SPD_IPV4_HTHRESH,
347 	XFRMA_SPD_IPV6_HTHRESH,
348 	__XFRMA_SPD_MAX
349 
350 #define XFRMA_SPD_MAX (__XFRMA_SPD_MAX - 1)
351 };
352 
353 struct xfrmu_spdinfo {
354 	__u32 incnt;
355 	__u32 outcnt;
356 	__u32 fwdcnt;
357 	__u32 inscnt;
358 	__u32 outscnt;
359 	__u32 fwdscnt;
360 };
361 
362 struct xfrmu_spdhinfo {
363 	__u32 spdhcnt;
364 	__u32 spdhmcnt;
365 };
366 
367 struct xfrmu_spdhthresh {
368 	__u8 lbits;
369 	__u8 rbits;
370 };
371 
372 struct xfrm_usersa_info {
373 	struct xfrm_selector		sel;
374 	struct xfrm_id			id;
375 	xfrm_address_t			saddr;
376 	struct xfrm_lifetime_cfg	lft;
377 	struct xfrm_lifetime_cur	curlft;
378 	struct xfrm_stats		stats;
379 	__u32				seq;
380 	__u32				reqid;
381 	__u16				family;
382 	__u8				mode;		/* XFRM_MODE_xxx */
383 	__u8				replay_window;
384 	__u8				flags;
385 #define XFRM_STATE_NOECN	1
386 #define XFRM_STATE_DECAP_DSCP	2
387 #define XFRM_STATE_NOPMTUDISC	4
388 #define XFRM_STATE_WILDRECV	8
389 #define XFRM_STATE_ICMP		16
390 #define XFRM_STATE_AF_UNSPEC	32
391 #define XFRM_STATE_ALIGN4	64
392 #define XFRM_STATE_ESN		128
393 };
394 
395 #define XFRM_SA_XFLAG_DONT_ENCAP_DSCP	1
396 #define XFRM_SA_XFLAG_OSEQ_MAY_WRAP	2
397 
398 struct xfrm_usersa_id {
399 	xfrm_address_t			daddr;
400 	__be32				spi;
401 	__u16				family;
402 	__u8				proto;
403 };
404 
405 struct xfrm_aevent_id {
406 	struct xfrm_usersa_id		sa_id;
407 	xfrm_address_t			saddr;
408 	__u32				flags;
409 	__u32				reqid;
410 };
411 
412 struct xfrm_userspi_info {
413 	struct xfrm_usersa_info		info;
414 	__u32				min;
415 	__u32				max;
416 };
417 
418 struct xfrm_userpolicy_info {
419 	struct xfrm_selector		sel;
420 	struct xfrm_lifetime_cfg	lft;
421 	struct xfrm_lifetime_cur	curlft;
422 	__u32				priority;
423 	__u32				index;
424 	__u8				dir;
425 	__u8				action;
426 #define XFRM_POLICY_ALLOW	0
427 #define XFRM_POLICY_BLOCK	1
428 	__u8				flags;
429 #define XFRM_POLICY_LOCALOK	1	/* Allow user to override global policy */
430 	/* Automatically expand selector to include matching ICMP payloads. */
431 #define XFRM_POLICY_ICMP	2
432 	__u8				share;
433 };
434 
435 struct xfrm_userpolicy_id {
436 	struct xfrm_selector		sel;
437 	__u32				index;
438 	__u8				dir;
439 };
440 
441 struct xfrm_user_acquire {
442 	struct xfrm_id			id;
443 	xfrm_address_t			saddr;
444 	struct xfrm_selector		sel;
445 	struct xfrm_userpolicy_info	policy;
446 	__u32				aalgos;
447 	__u32				ealgos;
448 	__u32				calgos;
449 	__u32				seq;
450 };
451 
452 struct xfrm_user_expire {
453 	struct xfrm_usersa_info		state;
454 	__u8				hard;
455 };
456 
457 struct xfrm_user_polexpire {
458 	struct xfrm_userpolicy_info	pol;
459 	__u8				hard;
460 };
461 
462 struct xfrm_usersa_flush {
463 	__u8				proto;
464 };
465 
466 struct xfrm_user_report {
467 	__u8				proto;
468 	struct xfrm_selector		sel;
469 };
470 
471 /* Used by MIGRATE to pass addresses IKE should use to perform
472  * SA negotiation with the peer */
473 struct xfrm_user_kmaddress {
474 	xfrm_address_t                  local;
475 	xfrm_address_t                  remote;
476 	__u32				reserved;
477 	__u16				family;
478 };
479 
480 struct xfrm_user_migrate {
481 	xfrm_address_t			old_daddr;
482 	xfrm_address_t			old_saddr;
483 	xfrm_address_t			new_daddr;
484 	xfrm_address_t			new_saddr;
485 	__u8				proto;
486 	__u8				mode;
487 	__u16				reserved;
488 	__u32				reqid;
489 	__u16				old_family;
490 	__u16				new_family;
491 };
492 
493 struct xfrm_user_mapping {
494 	struct xfrm_usersa_id		id;
495 	__u32				reqid;
496 	xfrm_address_t			old_saddr;
497 	xfrm_address_t			new_saddr;
498 	__be16				old_sport;
499 	__be16				new_sport;
500 };
501 
502 struct xfrm_address_filter {
503 	xfrm_address_t			saddr;
504 	xfrm_address_t			daddr;
505 	__u16				family;
506 	__u8				splen;
507 	__u8				dplen;
508 };
509 
510 struct xfrm_user_offload {
511 	int				ifindex;
512 	__u8				flags;
513 };
514 /* This flag was exposed without any kernel code that supports it.
515  * Unfortunately, strongswan has the code that sets this flag,
516  * which makes it impossible to reuse this bit.
517  *
518  * So leave it here to make sure that it won't be reused by mistake.
519  */
520 #define XFRM_OFFLOAD_IPV6	1
521 #define XFRM_OFFLOAD_INBOUND	2
522 
523 struct xfrm_userpolicy_default {
524 #define XFRM_USERPOLICY_UNSPEC	0
525 #define XFRM_USERPOLICY_BLOCK	1
526 #define XFRM_USERPOLICY_ACCEPT	2
527 	__u8				in;
528 	__u8				fwd;
529 	__u8				out;
530 };
531 
532 #ifndef __KERNEL__
533 /* backwards compatibility for userspace */
534 #define XFRMGRP_ACQUIRE		1
535 #define XFRMGRP_EXPIRE		2
536 #define XFRMGRP_SA		4
537 #define XFRMGRP_POLICY		8
538 #define XFRMGRP_REPORT		0x20
539 #endif
540 
541 enum xfrm_nlgroups {
542 	XFRMNLGRP_NONE,
543 #define XFRMNLGRP_NONE		XFRMNLGRP_NONE
544 	XFRMNLGRP_ACQUIRE,
545 #define XFRMNLGRP_ACQUIRE	XFRMNLGRP_ACQUIRE
546 	XFRMNLGRP_EXPIRE,
547 #define XFRMNLGRP_EXPIRE	XFRMNLGRP_EXPIRE
548 	XFRMNLGRP_SA,
549 #define XFRMNLGRP_SA		XFRMNLGRP_SA
550 	XFRMNLGRP_POLICY,
551 #define XFRMNLGRP_POLICY	XFRMNLGRP_POLICY
552 	XFRMNLGRP_AEVENTS,
553 #define XFRMNLGRP_AEVENTS	XFRMNLGRP_AEVENTS
554 	XFRMNLGRP_REPORT,
555 #define XFRMNLGRP_REPORT	XFRMNLGRP_REPORT
556 	XFRMNLGRP_MIGRATE,
557 #define XFRMNLGRP_MIGRATE	XFRMNLGRP_MIGRATE
558 	XFRMNLGRP_MAPPING,
559 #define XFRMNLGRP_MAPPING	XFRMNLGRP_MAPPING
560 	__XFRMNLGRP_MAX
561 };
562 #define XFRMNLGRP_MAX	(__XFRMNLGRP_MAX - 1)
563 
564 #endif /* _LINUX_XFRM_H */
565