1 // SPDX-License-Identifier: GPL-2.0-only
2 /* xfrm_user.c: User interface to configure xfrm engine.
3 *
4 * Copyright (C) 2002 David S. Miller (davem@redhat.com)
5 *
6 * Changes:
7 * Mitsuru KANDA @USAGI
8 * Kazunori MIYAZAWA @USAGI
9 * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
10 * IPv6 support
11 *
12 */
13
14 #include <linux/compat.h>
15 #include <linux/crypto.h>
16 #include <linux/module.h>
17 #include <linux/kernel.h>
18 #include <linux/types.h>
19 #include <linux/slab.h>
20 #include <linux/socket.h>
21 #include <linux/string.h>
22 #include <linux/net.h>
23 #include <linux/skbuff.h>
24 #include <linux/pfkeyv2.h>
25 #include <linux/ipsec.h>
26 #include <linux/init.h>
27 #include <linux/security.h>
28 #include <net/sock.h>
29 #include <net/xfrm.h>
30 #include <net/netlink.h>
31 #include <net/ah.h>
32 #include <linux/uaccess.h>
33 #if IS_ENABLED(CONFIG_IPV6)
34 #include <linux/in6.h>
35 #endif
36 #include <linux/unaligned.h>
37
verify_one_alg(struct nlattr ** attrs,enum xfrm_attr_type_t type,struct netlink_ext_ack * extack)38 static int verify_one_alg(struct nlattr **attrs, enum xfrm_attr_type_t type,
39 struct netlink_ext_ack *extack)
40 {
41 struct nlattr *rt = attrs[type];
42 struct xfrm_algo *algp;
43
44 if (!rt)
45 return 0;
46
47 algp = nla_data(rt);
48 if (nla_len(rt) < (int)xfrm_alg_len(algp)) {
49 NL_SET_ERR_MSG(extack, "Invalid AUTH/CRYPT/COMP attribute length");
50 return -EINVAL;
51 }
52
53 switch (type) {
54 case XFRMA_ALG_AUTH:
55 case XFRMA_ALG_CRYPT:
56 case XFRMA_ALG_COMP:
57 break;
58
59 default:
60 NL_SET_ERR_MSG(extack, "Invalid algorithm attribute type");
61 return -EINVAL;
62 }
63
64 algp->alg_name[sizeof(algp->alg_name) - 1] = '\0';
65 return 0;
66 }
67
verify_auth_trunc(struct nlattr ** attrs,struct netlink_ext_ack * extack)68 static int verify_auth_trunc(struct nlattr **attrs,
69 struct netlink_ext_ack *extack)
70 {
71 struct nlattr *rt = attrs[XFRMA_ALG_AUTH_TRUNC];
72 struct xfrm_algo_auth *algp;
73
74 if (!rt)
75 return 0;
76
77 algp = nla_data(rt);
78 if (nla_len(rt) < (int)xfrm_alg_auth_len(algp)) {
79 NL_SET_ERR_MSG(extack, "Invalid AUTH_TRUNC attribute length");
80 return -EINVAL;
81 }
82
83 algp->alg_name[sizeof(algp->alg_name) - 1] = '\0';
84 return 0;
85 }
86
verify_aead(struct nlattr ** attrs,struct netlink_ext_ack * extack)87 static int verify_aead(struct nlattr **attrs, struct netlink_ext_ack *extack)
88 {
89 struct nlattr *rt = attrs[XFRMA_ALG_AEAD];
90 struct xfrm_algo_aead *algp;
91
92 if (!rt)
93 return 0;
94
95 algp = nla_data(rt);
96 if (nla_len(rt) < (int)aead_len(algp)) {
97 NL_SET_ERR_MSG(extack, "Invalid AEAD attribute length");
98 return -EINVAL;
99 }
100
101 algp->alg_name[sizeof(algp->alg_name) - 1] = '\0';
102 return 0;
103 }
104
verify_one_addr(struct nlattr ** attrs,enum xfrm_attr_type_t type,xfrm_address_t ** addrp)105 static void verify_one_addr(struct nlattr **attrs, enum xfrm_attr_type_t type,
106 xfrm_address_t **addrp)
107 {
108 struct nlattr *rt = attrs[type];
109
110 if (rt && addrp)
111 *addrp = nla_data(rt);
112 }
113
verify_sec_ctx_len(struct nlattr ** attrs,struct netlink_ext_ack * extack)114 static inline int verify_sec_ctx_len(struct nlattr **attrs, struct netlink_ext_ack *extack)
115 {
116 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
117 struct xfrm_user_sec_ctx *uctx;
118
119 if (!rt)
120 return 0;
121
122 uctx = nla_data(rt);
123 if (uctx->len > nla_len(rt) ||
124 uctx->len != (sizeof(struct xfrm_user_sec_ctx) + uctx->ctx_len)) {
125 NL_SET_ERR_MSG(extack, "Invalid security context length");
126 return -EINVAL;
127 }
128
129 return 0;
130 }
131
verify_replay(struct xfrm_usersa_info * p,struct nlattr ** attrs,u8 sa_dir,struct netlink_ext_ack * extack)132 static inline int verify_replay(struct xfrm_usersa_info *p,
133 struct nlattr **attrs, u8 sa_dir,
134 struct netlink_ext_ack *extack)
135 {
136 struct nlattr *rt = attrs[XFRMA_REPLAY_ESN_VAL];
137 struct xfrm_replay_state_esn *rs;
138
139 if (!rt) {
140 if (p->flags & XFRM_STATE_ESN) {
141 NL_SET_ERR_MSG(extack, "Missing required attribute for ESN");
142 return -EINVAL;
143 }
144 return 0;
145 }
146
147 rs = nla_data(rt);
148
149 if (rs->bmp_len > XFRMA_REPLAY_ESN_MAX / sizeof(rs->bmp[0]) / 8) {
150 NL_SET_ERR_MSG(extack, "ESN bitmap length must be <= 128");
151 return -EINVAL;
152 }
153
154 if (nla_len(rt) < (int)xfrm_replay_state_esn_len(rs) &&
155 nla_len(rt) != sizeof(*rs)) {
156 NL_SET_ERR_MSG(extack, "ESN attribute is too short to fit the full bitmap length");
157 return -EINVAL;
158 }
159
160 /* As only ESP and AH support ESN feature. */
161 if ((p->id.proto != IPPROTO_ESP) && (p->id.proto != IPPROTO_AH)) {
162 NL_SET_ERR_MSG(extack, "ESN only supported for ESP and AH");
163 return -EINVAL;
164 }
165
166 if (p->replay_window != 0) {
167 NL_SET_ERR_MSG(extack, "ESN not compatible with legacy replay_window");
168 return -EINVAL;
169 }
170
171 if (sa_dir == XFRM_SA_DIR_OUT) {
172 if (rs->replay_window) {
173 NL_SET_ERR_MSG(extack, "Replay window should be 0 for output SA");
174 return -EINVAL;
175 }
176 if (rs->seq || rs->seq_hi) {
177 NL_SET_ERR_MSG(extack,
178 "Replay seq and seq_hi should be 0 for output SA");
179 return -EINVAL;
180 }
181
182 if (!(p->flags & XFRM_STATE_ESN)) {
183 if (rs->oseq_hi) {
184 NL_SET_ERR_MSG(
185 extack,
186 "Replay oseq_hi should be 0 in non-ESN mode for output SA");
187 return -EINVAL;
188 }
189 if (rs->oseq == U32_MAX) {
190 NL_SET_ERR_MSG(
191 extack,
192 "Replay oseq should be less than 0xFFFFFFFF in non-ESN mode for output SA");
193 return -EINVAL;
194 }
195 } else {
196 if (rs->oseq == U32_MAX && rs->oseq_hi == U32_MAX) {
197 NL_SET_ERR_MSG(
198 extack,
199 "Replay oseq and oseq_hi should be less than 0xFFFFFFFF for output SA");
200 return -EINVAL;
201 }
202 }
203 if (rs->bmp_len) {
204 NL_SET_ERR_MSG(extack, "Replay bmp_len should 0 for output SA");
205 return -EINVAL;
206 }
207 }
208
209 if (sa_dir == XFRM_SA_DIR_IN) {
210 if (rs->oseq || rs->oseq_hi) {
211 NL_SET_ERR_MSG(extack,
212 "Replay oseq and oseq_hi should be 0 for input SA");
213 return -EINVAL;
214 }
215 if (!(p->flags & XFRM_STATE_ESN)) {
216 if (rs->seq_hi) {
217 NL_SET_ERR_MSG(
218 extack,
219 "Replay seq_hi should be 0 in non-ESN mode for input SA");
220 return -EINVAL;
221 }
222
223 if (rs->seq == U32_MAX) {
224 NL_SET_ERR_MSG(
225 extack,
226 "Replay seq should be less than 0xFFFFFFFF in non-ESN mode for input SA");
227 return -EINVAL;
228 }
229 } else {
230 if (rs->seq == U32_MAX && rs->seq_hi == U32_MAX) {
231 NL_SET_ERR_MSG(
232 extack,
233 "Replay seq and seq_hi should be less than 0xFFFFFFFF for input SA");
234 return -EINVAL;
235 }
236 }
237 }
238
239 return 0;
240 }
241
verify_newsa_info(struct xfrm_usersa_info * p,struct nlattr ** attrs,struct netlink_ext_ack * extack)242 static int verify_newsa_info(struct xfrm_usersa_info *p,
243 struct nlattr **attrs,
244 struct netlink_ext_ack *extack)
245 {
246 int err;
247 u8 sa_dir = nla_get_u8_default(attrs[XFRMA_SA_DIR], 0);
248 u16 family = p->sel.family;
249
250 err = -EINVAL;
251 switch (p->family) {
252 case AF_INET:
253 break;
254
255 case AF_INET6:
256 #if IS_ENABLED(CONFIG_IPV6)
257 break;
258 #else
259 err = -EAFNOSUPPORT;
260 NL_SET_ERR_MSG(extack, "IPv6 support disabled");
261 goto out;
262 #endif
263
264 default:
265 NL_SET_ERR_MSG(extack, "Invalid address family");
266 goto out;
267 }
268
269 if (!family && !(p->flags & XFRM_STATE_AF_UNSPEC))
270 family = p->family;
271
272 switch (family) {
273 case AF_UNSPEC:
274 break;
275
276 case AF_INET:
277 if (p->sel.prefixlen_d > 32 || p->sel.prefixlen_s > 32) {
278 NL_SET_ERR_MSG(extack, "Invalid prefix length in selector (must be <= 32 for IPv4)");
279 goto out;
280 }
281
282 break;
283
284 case AF_INET6:
285 #if IS_ENABLED(CONFIG_IPV6)
286 if (p->sel.prefixlen_d > 128 || p->sel.prefixlen_s > 128) {
287 NL_SET_ERR_MSG(extack, "Invalid prefix length in selector (must be <= 128 for IPv6)");
288 goto out;
289 }
290
291 break;
292 #else
293 NL_SET_ERR_MSG(extack, "IPv6 support disabled");
294 err = -EAFNOSUPPORT;
295 goto out;
296 #endif
297
298 default:
299 NL_SET_ERR_MSG(extack, "Invalid address family in selector");
300 goto out;
301 }
302
303 err = -EINVAL;
304 switch (p->id.proto) {
305 case IPPROTO_AH:
306 if (!attrs[XFRMA_ALG_AUTH] &&
307 !attrs[XFRMA_ALG_AUTH_TRUNC]) {
308 NL_SET_ERR_MSG(extack, "Missing required attribute for AH: AUTH_TRUNC or AUTH");
309 goto out;
310 }
311
312 if (attrs[XFRMA_ALG_AEAD] ||
313 attrs[XFRMA_ALG_CRYPT] ||
314 attrs[XFRMA_ALG_COMP] ||
315 attrs[XFRMA_TFCPAD]) {
316 NL_SET_ERR_MSG(extack, "Invalid attributes for AH: AEAD, CRYPT, COMP, TFCPAD");
317 goto out;
318 }
319 break;
320
321 case IPPROTO_ESP:
322 if (attrs[XFRMA_ALG_COMP]) {
323 NL_SET_ERR_MSG(extack, "Invalid attribute for ESP: COMP");
324 goto out;
325 }
326
327 if (!attrs[XFRMA_ALG_AUTH] &&
328 !attrs[XFRMA_ALG_AUTH_TRUNC] &&
329 !attrs[XFRMA_ALG_CRYPT] &&
330 !attrs[XFRMA_ALG_AEAD]) {
331 NL_SET_ERR_MSG(extack, "Missing required attribute for ESP: at least one of AUTH, AUTH_TRUNC, CRYPT, AEAD");
332 goto out;
333 }
334
335 if ((attrs[XFRMA_ALG_AUTH] ||
336 attrs[XFRMA_ALG_AUTH_TRUNC] ||
337 attrs[XFRMA_ALG_CRYPT]) &&
338 attrs[XFRMA_ALG_AEAD]) {
339 NL_SET_ERR_MSG(extack, "Invalid attribute combination for ESP: AEAD can't be used with AUTH, AUTH_TRUNC, CRYPT");
340 goto out;
341 }
342
343 if (attrs[XFRMA_TFCPAD] &&
344 p->mode != XFRM_MODE_TUNNEL) {
345 NL_SET_ERR_MSG(extack, "TFC padding can only be used in tunnel mode");
346 goto out;
347 }
348 if ((attrs[XFRMA_IPTFS_DROP_TIME] ||
349 attrs[XFRMA_IPTFS_REORDER_WINDOW] ||
350 attrs[XFRMA_IPTFS_DONT_FRAG] ||
351 attrs[XFRMA_IPTFS_INIT_DELAY] ||
352 attrs[XFRMA_IPTFS_MAX_QSIZE] ||
353 attrs[XFRMA_IPTFS_PKT_SIZE]) &&
354 p->mode != XFRM_MODE_IPTFS) {
355 NL_SET_ERR_MSG(extack, "IP-TFS options can only be used in IP-TFS mode");
356 goto out;
357 }
358 break;
359
360 case IPPROTO_COMP:
361 if (!attrs[XFRMA_ALG_COMP]) {
362 NL_SET_ERR_MSG(extack, "Missing required attribute for COMP: COMP");
363 goto out;
364 }
365
366 if (attrs[XFRMA_ALG_AEAD] ||
367 attrs[XFRMA_ALG_AUTH] ||
368 attrs[XFRMA_ALG_AUTH_TRUNC] ||
369 attrs[XFRMA_ALG_CRYPT] ||
370 attrs[XFRMA_TFCPAD]) {
371 NL_SET_ERR_MSG(extack, "Invalid attributes for COMP: AEAD, AUTH, AUTH_TRUNC, CRYPT, TFCPAD");
372 goto out;
373 }
374
375 if (ntohl(p->id.spi) >= 0x10000) {
376 NL_SET_ERR_MSG(extack, "SPI is too large for COMP (must be < 0x10000)");
377 goto out;
378 }
379 break;
380
381 #if IS_ENABLED(CONFIG_IPV6)
382 case IPPROTO_DSTOPTS:
383 case IPPROTO_ROUTING:
384 if (attrs[XFRMA_ALG_COMP] ||
385 attrs[XFRMA_ALG_AUTH] ||
386 attrs[XFRMA_ALG_AUTH_TRUNC] ||
387 attrs[XFRMA_ALG_AEAD] ||
388 attrs[XFRMA_ALG_CRYPT] ||
389 attrs[XFRMA_ENCAP] ||
390 attrs[XFRMA_SEC_CTX] ||
391 attrs[XFRMA_TFCPAD]) {
392 NL_SET_ERR_MSG(extack, "Invalid attributes for DSTOPTS/ROUTING");
393 goto out;
394 }
395
396 if (!attrs[XFRMA_COADDR]) {
397 NL_SET_ERR_MSG(extack, "Missing required COADDR attribute for DSTOPTS/ROUTING");
398 goto out;
399 }
400 break;
401 #endif
402
403 default:
404 NL_SET_ERR_MSG(extack, "Unsupported protocol");
405 goto out;
406 }
407
408 if ((err = verify_aead(attrs, extack)))
409 goto out;
410 if ((err = verify_auth_trunc(attrs, extack)))
411 goto out;
412 if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH, extack)))
413 goto out;
414 if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT, extack)))
415 goto out;
416 if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP, extack)))
417 goto out;
418 if ((err = verify_sec_ctx_len(attrs, extack)))
419 goto out;
420 if ((err = verify_replay(p, attrs, sa_dir, extack)))
421 goto out;
422
423 err = -EINVAL;
424 switch (p->mode) {
425 case XFRM_MODE_TRANSPORT:
426 case XFRM_MODE_TUNNEL:
427 case XFRM_MODE_ROUTEOPTIMIZATION:
428 case XFRM_MODE_BEET:
429 break;
430 case XFRM_MODE_IPTFS:
431 if (p->id.proto != IPPROTO_ESP) {
432 NL_SET_ERR_MSG(extack, "IP-TFS mode only supported with ESP");
433 goto out;
434 }
435 if (sa_dir == 0) {
436 NL_SET_ERR_MSG(extack, "IP-TFS mode requires in or out direction attribute");
437 goto out;
438 }
439 break;
440
441 default:
442 NL_SET_ERR_MSG(extack, "Unsupported mode");
443 goto out;
444 }
445
446 err = 0;
447
448 if (attrs[XFRMA_MTIMER_THRESH]) {
449 if (!attrs[XFRMA_ENCAP]) {
450 NL_SET_ERR_MSG(extack, "MTIMER_THRESH attribute can only be set on ENCAP states");
451 err = -EINVAL;
452 goto out;
453 }
454
455 if (sa_dir == XFRM_SA_DIR_OUT) {
456 NL_SET_ERR_MSG(extack,
457 "MTIMER_THRESH attribute should not be set on output SA");
458 err = -EINVAL;
459 goto out;
460 }
461 }
462
463 if (sa_dir == XFRM_SA_DIR_OUT) {
464 if (p->flags & XFRM_STATE_DECAP_DSCP) {
465 NL_SET_ERR_MSG(extack, "Flag DECAP_DSCP should not be set for output SA");
466 err = -EINVAL;
467 goto out;
468 }
469
470 if (p->flags & XFRM_STATE_ICMP) {
471 NL_SET_ERR_MSG(extack, "Flag ICMP should not be set for output SA");
472 err = -EINVAL;
473 goto out;
474 }
475
476 if (p->flags & XFRM_STATE_WILDRECV) {
477 NL_SET_ERR_MSG(extack, "Flag WILDRECV should not be set for output SA");
478 err = -EINVAL;
479 goto out;
480 }
481
482 if (p->replay_window) {
483 NL_SET_ERR_MSG(extack, "Replay window should be 0 for output SA");
484 err = -EINVAL;
485 goto out;
486 }
487
488 if (attrs[XFRMA_IPTFS_DROP_TIME]) {
489 NL_SET_ERR_MSG(extack, "IP-TFS drop time should not be set for output SA");
490 err = -EINVAL;
491 goto out;
492 }
493
494 if (attrs[XFRMA_IPTFS_REORDER_WINDOW]) {
495 NL_SET_ERR_MSG(extack, "IP-TFS reorder window should not be set for output SA");
496 err = -EINVAL;
497 goto out;
498 }
499
500 if (attrs[XFRMA_REPLAY_VAL]) {
501 struct xfrm_replay_state *replay;
502
503 replay = nla_data(attrs[XFRMA_REPLAY_VAL]);
504
505 if (replay->seq || replay->bitmap) {
506 NL_SET_ERR_MSG(extack,
507 "Replay seq and bitmap should be 0 for output SA");
508 err = -EINVAL;
509 goto out;
510 }
511 }
512 }
513
514 if (sa_dir == XFRM_SA_DIR_IN) {
515 if (p->flags & XFRM_STATE_NOPMTUDISC) {
516 NL_SET_ERR_MSG(extack, "Flag NOPMTUDISC should not be set for input SA");
517 err = -EINVAL;
518 goto out;
519 }
520
521 if (attrs[XFRMA_SA_EXTRA_FLAGS]) {
522 u32 xflags = nla_get_u32(attrs[XFRMA_SA_EXTRA_FLAGS]);
523
524 if (xflags & XFRM_SA_XFLAG_DONT_ENCAP_DSCP) {
525 NL_SET_ERR_MSG(extack, "Flag DONT_ENCAP_DSCP should not be set for input SA");
526 err = -EINVAL;
527 goto out;
528 }
529
530 if (xflags & XFRM_SA_XFLAG_OSEQ_MAY_WRAP) {
531 NL_SET_ERR_MSG(extack, "Flag OSEQ_MAY_WRAP should not be set for input SA");
532 err = -EINVAL;
533 goto out;
534 }
535
536 }
537
538 if (attrs[XFRMA_IPTFS_DONT_FRAG]) {
539 NL_SET_ERR_MSG(extack, "IP-TFS don't fragment should not be set for input SA");
540 err = -EINVAL;
541 goto out;
542 }
543
544 if (attrs[XFRMA_IPTFS_INIT_DELAY]) {
545 NL_SET_ERR_MSG(extack, "IP-TFS initial delay should not be set for input SA");
546 err = -EINVAL;
547 goto out;
548 }
549
550 if (attrs[XFRMA_IPTFS_MAX_QSIZE]) {
551 NL_SET_ERR_MSG(extack, "IP-TFS max queue size should not be set for input SA");
552 err = -EINVAL;
553 goto out;
554 }
555
556 if (attrs[XFRMA_IPTFS_PKT_SIZE]) {
557 NL_SET_ERR_MSG(extack, "IP-TFS packet size should not be set for input SA");
558 err = -EINVAL;
559 goto out;
560 }
561 }
562
563 if (!sa_dir && attrs[XFRMA_SA_PCPU]) {
564 NL_SET_ERR_MSG(extack, "SA_PCPU only supported with SA_DIR");
565 err = -EINVAL;
566 goto out;
567 }
568
569 out:
570 return err;
571 }
572
attach_one_algo(struct xfrm_algo ** algpp,u8 * props,struct xfrm_algo_desc * (* get_byname)(const char *,int),struct nlattr * rta,struct netlink_ext_ack * extack)573 static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
574 struct xfrm_algo_desc *(*get_byname)(const char *, int),
575 struct nlattr *rta, struct netlink_ext_ack *extack)
576 {
577 struct xfrm_algo *p, *ualg;
578 struct xfrm_algo_desc *algo;
579
580 if (!rta)
581 return 0;
582
583 ualg = nla_data(rta);
584
585 algo = get_byname(ualg->alg_name, 1);
586 if (!algo) {
587 NL_SET_ERR_MSG(extack, "Requested COMP algorithm not found");
588 return -ENOSYS;
589 }
590 *props = algo->desc.sadb_alg_id;
591
592 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
593 if (!p)
594 return -ENOMEM;
595
596 strcpy(p->alg_name, algo->name);
597 *algpp = p;
598 return 0;
599 }
600
attach_crypt(struct xfrm_state * x,struct nlattr * rta,struct netlink_ext_ack * extack)601 static int attach_crypt(struct xfrm_state *x, struct nlattr *rta,
602 struct netlink_ext_ack *extack)
603 {
604 struct xfrm_algo *p, *ualg;
605 struct xfrm_algo_desc *algo;
606
607 if (!rta)
608 return 0;
609
610 ualg = nla_data(rta);
611
612 algo = xfrm_ealg_get_byname(ualg->alg_name, 1);
613 if (!algo) {
614 NL_SET_ERR_MSG(extack, "Requested CRYPT algorithm not found");
615 return -ENOSYS;
616 }
617 x->props.ealgo = algo->desc.sadb_alg_id;
618
619 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
620 if (!p)
621 return -ENOMEM;
622
623 strcpy(p->alg_name, algo->name);
624 x->ealg = p;
625 x->geniv = algo->uinfo.encr.geniv;
626 return 0;
627 }
628
attach_auth(struct xfrm_algo_auth ** algpp,u8 * props,struct nlattr * rta,struct netlink_ext_ack * extack)629 static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props,
630 struct nlattr *rta, struct netlink_ext_ack *extack)
631 {
632 struct xfrm_algo *ualg;
633 struct xfrm_algo_auth *p;
634 struct xfrm_algo_desc *algo;
635
636 if (!rta)
637 return 0;
638
639 ualg = nla_data(rta);
640
641 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
642 if (!algo) {
643 NL_SET_ERR_MSG(extack, "Requested AUTH algorithm not found");
644 return -ENOSYS;
645 }
646 *props = algo->desc.sadb_alg_id;
647
648 p = kmalloc(sizeof(*p) + (ualg->alg_key_len + 7) / 8, GFP_KERNEL);
649 if (!p)
650 return -ENOMEM;
651
652 strcpy(p->alg_name, algo->name);
653 p->alg_key_len = ualg->alg_key_len;
654 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
655 memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8);
656
657 *algpp = p;
658 return 0;
659 }
660
attach_auth_trunc(struct xfrm_algo_auth ** algpp,u8 * props,struct nlattr * rta,struct netlink_ext_ack * extack)661 static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props,
662 struct nlattr *rta, struct netlink_ext_ack *extack)
663 {
664 struct xfrm_algo_auth *p, *ualg;
665 struct xfrm_algo_desc *algo;
666
667 if (!rta)
668 return 0;
669
670 ualg = nla_data(rta);
671
672 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
673 if (!algo) {
674 NL_SET_ERR_MSG(extack, "Requested AUTH_TRUNC algorithm not found");
675 return -ENOSYS;
676 }
677 if (ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits) {
678 NL_SET_ERR_MSG(extack, "Invalid length requested for truncated ICV");
679 return -EINVAL;
680 }
681 *props = algo->desc.sadb_alg_id;
682
683 p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL);
684 if (!p)
685 return -ENOMEM;
686
687 strcpy(p->alg_name, algo->name);
688 if (!p->alg_trunc_len)
689 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
690
691 *algpp = p;
692 return 0;
693 }
694
attach_aead(struct xfrm_state * x,struct nlattr * rta,struct netlink_ext_ack * extack)695 static int attach_aead(struct xfrm_state *x, struct nlattr *rta,
696 struct netlink_ext_ack *extack)
697 {
698 struct xfrm_algo_aead *p, *ualg;
699 struct xfrm_algo_desc *algo;
700
701 if (!rta)
702 return 0;
703
704 ualg = nla_data(rta);
705
706 algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1);
707 if (!algo) {
708 NL_SET_ERR_MSG(extack, "Requested AEAD algorithm not found");
709 return -ENOSYS;
710 }
711 x->props.ealgo = algo->desc.sadb_alg_id;
712
713 p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL);
714 if (!p)
715 return -ENOMEM;
716
717 strcpy(p->alg_name, algo->name);
718 x->aead = p;
719 x->geniv = algo->uinfo.aead.geniv;
720 return 0;
721 }
722
xfrm_replay_verify_len(struct xfrm_replay_state_esn * replay_esn,struct nlattr * rp,struct netlink_ext_ack * extack)723 static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_esn,
724 struct nlattr *rp,
725 struct netlink_ext_ack *extack)
726 {
727 struct xfrm_replay_state_esn *up;
728 unsigned int ulen;
729
730 if (!replay_esn || !rp)
731 return 0;
732
733 up = nla_data(rp);
734 ulen = xfrm_replay_state_esn_len(up);
735
736 /* Check the overall length and the internal bitmap length to avoid
737 * potential overflow. */
738 if (nla_len(rp) < (int)ulen) {
739 NL_SET_ERR_MSG(extack, "ESN attribute is too short");
740 return -EINVAL;
741 }
742
743 if (xfrm_replay_state_esn_len(replay_esn) != ulen) {
744 NL_SET_ERR_MSG(extack, "New ESN size doesn't match the existing SA's ESN size");
745 return -EINVAL;
746 }
747
748 if (replay_esn->bmp_len != up->bmp_len) {
749 NL_SET_ERR_MSG(extack, "New ESN bitmap size doesn't match the existing SA's ESN bitmap");
750 return -EINVAL;
751 }
752
753 if (up->replay_window > up->bmp_len * sizeof(__u32) * 8) {
754 NL_SET_ERR_MSG(extack, "ESN replay window is longer than the bitmap");
755 return -EINVAL;
756 }
757
758 return 0;
759 }
760
xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn ** replay_esn,struct xfrm_replay_state_esn ** preplay_esn,struct nlattr * rta)761 static int xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn **replay_esn,
762 struct xfrm_replay_state_esn **preplay_esn,
763 struct nlattr *rta)
764 {
765 struct xfrm_replay_state_esn *p, *pp, *up;
766 unsigned int klen, ulen;
767
768 if (!rta)
769 return 0;
770
771 up = nla_data(rta);
772 klen = xfrm_replay_state_esn_len(up);
773 ulen = nla_len(rta) >= (int)klen ? klen : sizeof(*up);
774
775 p = kzalloc(klen, GFP_KERNEL);
776 if (!p)
777 return -ENOMEM;
778
779 pp = kzalloc(klen, GFP_KERNEL);
780 if (!pp) {
781 kfree(p);
782 return -ENOMEM;
783 }
784
785 memcpy(p, up, ulen);
786 memcpy(pp, up, ulen);
787
788 *replay_esn = p;
789 *preplay_esn = pp;
790
791 return 0;
792 }
793
xfrm_user_sec_ctx_size(struct xfrm_sec_ctx * xfrm_ctx)794 static inline unsigned int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx)
795 {
796 unsigned int len = 0;
797
798 if (xfrm_ctx) {
799 len += sizeof(struct xfrm_user_sec_ctx);
800 len += xfrm_ctx->ctx_len;
801 }
802 return len;
803 }
804
copy_from_user_state(struct xfrm_state * x,struct xfrm_usersa_info * p)805 static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
806 {
807 memcpy(&x->id, &p->id, sizeof(x->id));
808 memcpy(&x->sel, &p->sel, sizeof(x->sel));
809 memcpy(&x->lft, &p->lft, sizeof(x->lft));
810 x->props.mode = p->mode;
811 x->props.replay_window = min_t(unsigned int, p->replay_window,
812 sizeof(x->replay.bitmap) * 8);
813 x->props.reqid = p->reqid;
814 x->props.family = p->family;
815 memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr));
816 x->props.flags = p->flags;
817
818 if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC))
819 x->sel.family = p->family;
820 }
821
822 /*
823 * someday when pfkey also has support, we could have the code
824 * somehow made shareable and move it to xfrm_state.c - JHS
825 *
826 */
xfrm_update_ae_params(struct xfrm_state * x,struct nlattr ** attrs,int update_esn)827 static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs,
828 int update_esn)
829 {
830 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
831 struct nlattr *re = update_esn ? attrs[XFRMA_REPLAY_ESN_VAL] : NULL;
832 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
833 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
834 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
835 struct nlattr *mt = attrs[XFRMA_MTIMER_THRESH];
836
837 if (re && x->replay_esn && x->preplay_esn) {
838 struct xfrm_replay_state_esn *replay_esn;
839 replay_esn = nla_data(re);
840 memcpy(x->replay_esn, replay_esn,
841 xfrm_replay_state_esn_len(replay_esn));
842 memcpy(x->preplay_esn, replay_esn,
843 xfrm_replay_state_esn_len(replay_esn));
844 }
845
846 if (rp) {
847 struct xfrm_replay_state *replay;
848 replay = nla_data(rp);
849 memcpy(&x->replay, replay, sizeof(*replay));
850 memcpy(&x->preplay, replay, sizeof(*replay));
851 }
852
853 if (lt) {
854 struct xfrm_lifetime_cur *ltime;
855 ltime = nla_data(lt);
856 x->curlft.bytes = ltime->bytes;
857 x->curlft.packets = ltime->packets;
858 x->curlft.add_time = ltime->add_time;
859 x->curlft.use_time = ltime->use_time;
860 }
861
862 if (et)
863 x->replay_maxage = nla_get_u32(et);
864
865 if (rt)
866 x->replay_maxdiff = nla_get_u32(rt);
867
868 if (mt)
869 x->mapping_maxage = nla_get_u32(mt);
870 }
871
xfrm_smark_init(struct nlattr ** attrs,struct xfrm_mark * m)872 static void xfrm_smark_init(struct nlattr **attrs, struct xfrm_mark *m)
873 {
874 if (attrs[XFRMA_SET_MARK]) {
875 m->v = nla_get_u32(attrs[XFRMA_SET_MARK]);
876 m->m = nla_get_u32_default(attrs[XFRMA_SET_MARK_MASK],
877 0xffffffff);
878 } else {
879 m->v = m->m = 0;
880 }
881 }
882
xfrm_state_construct(struct net * net,struct xfrm_usersa_info * p,struct nlattr ** attrs,int * errp,struct netlink_ext_ack * extack)883 static struct xfrm_state *xfrm_state_construct(struct net *net,
884 struct xfrm_usersa_info *p,
885 struct nlattr **attrs,
886 int *errp,
887 struct netlink_ext_ack *extack)
888 {
889 struct xfrm_state *x = xfrm_state_alloc(net);
890 int err = -ENOMEM;
891
892 if (!x)
893 goto error_no_put;
894
895 copy_from_user_state(x, p);
896
897 if (attrs[XFRMA_ENCAP]) {
898 x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
899 sizeof(*x->encap), GFP_KERNEL);
900 if (x->encap == NULL)
901 goto error;
902 }
903
904 if (attrs[XFRMA_COADDR]) {
905 x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]),
906 sizeof(*x->coaddr), GFP_KERNEL);
907 if (x->coaddr == NULL)
908 goto error;
909 }
910
911 if (attrs[XFRMA_SA_EXTRA_FLAGS])
912 x->props.extra_flags = nla_get_u32(attrs[XFRMA_SA_EXTRA_FLAGS]);
913
914 if ((err = attach_aead(x, attrs[XFRMA_ALG_AEAD], extack)))
915 goto error;
916 if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo,
917 attrs[XFRMA_ALG_AUTH_TRUNC], extack)))
918 goto error;
919 if (!x->props.aalgo) {
920 if ((err = attach_auth(&x->aalg, &x->props.aalgo,
921 attrs[XFRMA_ALG_AUTH], extack)))
922 goto error;
923 }
924 if ((err = attach_crypt(x, attrs[XFRMA_ALG_CRYPT], extack)))
925 goto error;
926 if ((err = attach_one_algo(&x->calg, &x->props.calgo,
927 xfrm_calg_get_byname,
928 attrs[XFRMA_ALG_COMP], extack)))
929 goto error;
930
931 if (attrs[XFRMA_TFCPAD])
932 x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]);
933
934 xfrm_mark_get(attrs, &x->mark);
935
936 xfrm_smark_init(attrs, &x->props.smark);
937
938 if (attrs[XFRMA_IF_ID])
939 x->if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
940
941 if (attrs[XFRMA_SA_DIR])
942 x->dir = nla_get_u8(attrs[XFRMA_SA_DIR]);
943
944 if (attrs[XFRMA_NAT_KEEPALIVE_INTERVAL])
945 x->nat_keepalive_interval =
946 nla_get_u32(attrs[XFRMA_NAT_KEEPALIVE_INTERVAL]);
947
948 if (attrs[XFRMA_SA_PCPU]) {
949 x->pcpu_num = nla_get_u32(attrs[XFRMA_SA_PCPU]);
950 if (x->pcpu_num >= num_possible_cpus())
951 goto error;
952 }
953
954 err = __xfrm_init_state(x, extack);
955 if (err)
956 goto error;
957
958 if (attrs[XFRMA_SEC_CTX]) {
959 err = security_xfrm_state_alloc(x,
960 nla_data(attrs[XFRMA_SEC_CTX]));
961 if (err)
962 goto error;
963 }
964
965 if ((err = xfrm_alloc_replay_state_esn(&x->replay_esn, &x->preplay_esn,
966 attrs[XFRMA_REPLAY_ESN_VAL])))
967 goto error;
968
969 x->km.seq = p->seq;
970 x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth;
971 /* sysctl_xfrm_aevent_etime is in 100ms units */
972 x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M;
973
974 if ((err = xfrm_init_replay(x, extack)))
975 goto error;
976
977 /* override default values from above */
978 xfrm_update_ae_params(x, attrs, 0);
979
980 xfrm_set_type_offload(x, attrs[XFRMA_OFFLOAD_DEV]);
981 /* configure the hardware if offload is requested */
982 if (attrs[XFRMA_OFFLOAD_DEV]) {
983 err = xfrm_dev_state_add(net, x,
984 nla_data(attrs[XFRMA_OFFLOAD_DEV]),
985 extack);
986 if (err)
987 goto error;
988 }
989
990 if (x->mode_cbs && x->mode_cbs->user_init) {
991 err = x->mode_cbs->user_init(net, x, attrs, extack);
992 if (err)
993 goto error;
994 }
995
996 return x;
997
998 error:
999 x->km.state = XFRM_STATE_DEAD;
1000 xfrm_state_put(x);
1001 error_no_put:
1002 *errp = err;
1003 return NULL;
1004 }
1005
xfrm_add_sa(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs,struct netlink_ext_ack * extack)1006 static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1007 struct nlattr **attrs, struct netlink_ext_ack *extack)
1008 {
1009 struct net *net = sock_net(skb->sk);
1010 struct xfrm_usersa_info *p = nlmsg_data(nlh);
1011 struct xfrm_state *x;
1012 int err;
1013 struct km_event c;
1014
1015 err = verify_newsa_info(p, attrs, extack);
1016 if (err)
1017 return err;
1018
1019 x = xfrm_state_construct(net, p, attrs, &err, extack);
1020 if (!x)
1021 return err;
1022
1023 xfrm_state_hold(x);
1024 if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
1025 err = xfrm_state_add(x);
1026 else
1027 err = xfrm_state_update(x);
1028
1029 xfrm_audit_state_add(x, err ? 0 : 1, true);
1030
1031 if (err < 0) {
1032 x->km.state = XFRM_STATE_DEAD;
1033 xfrm_dev_state_delete(x);
1034 __xfrm_state_put(x);
1035 goto out;
1036 }
1037
1038 if (x->km.state == XFRM_STATE_VOID)
1039 x->km.state = XFRM_STATE_VALID;
1040
1041 c.seq = nlh->nlmsg_seq;
1042 c.portid = nlh->nlmsg_pid;
1043 c.event = nlh->nlmsg_type;
1044
1045 km_state_notify(x, &c);
1046 out:
1047 xfrm_state_put(x);
1048 return err;
1049 }
1050
xfrm_user_state_lookup(struct net * net,struct xfrm_usersa_id * p,struct nlattr ** attrs,int * errp)1051 static struct xfrm_state *xfrm_user_state_lookup(struct net *net,
1052 struct xfrm_usersa_id *p,
1053 struct nlattr **attrs,
1054 int *errp)
1055 {
1056 struct xfrm_state *x = NULL;
1057 struct xfrm_mark m;
1058 int err;
1059 u32 mark = xfrm_mark_get(attrs, &m);
1060
1061 if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
1062 err = -ESRCH;
1063 x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family);
1064 } else {
1065 xfrm_address_t *saddr = NULL;
1066
1067 verify_one_addr(attrs, XFRMA_SRCADDR, &saddr);
1068 if (!saddr) {
1069 err = -EINVAL;
1070 goto out;
1071 }
1072
1073 err = -ESRCH;
1074 x = xfrm_state_lookup_byaddr(net, mark,
1075 &p->daddr, saddr,
1076 p->proto, p->family);
1077 }
1078
1079 out:
1080 if (!x && errp)
1081 *errp = err;
1082 return x;
1083 }
1084
xfrm_del_sa(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs,struct netlink_ext_ack * extack)1085 static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1086 struct nlattr **attrs, struct netlink_ext_ack *extack)
1087 {
1088 struct net *net = sock_net(skb->sk);
1089 struct xfrm_state *x;
1090 int err = -ESRCH;
1091 struct km_event c;
1092 struct xfrm_usersa_id *p = nlmsg_data(nlh);
1093
1094 x = xfrm_user_state_lookup(net, p, attrs, &err);
1095 if (x == NULL)
1096 return err;
1097
1098 if ((err = security_xfrm_state_delete(x)) != 0)
1099 goto out;
1100
1101 if (xfrm_state_kern(x)) {
1102 NL_SET_ERR_MSG(extack, "SA is in use by tunnels");
1103 err = -EPERM;
1104 goto out;
1105 }
1106
1107 err = xfrm_state_delete(x);
1108 if (err < 0)
1109 goto out;
1110
1111 c.seq = nlh->nlmsg_seq;
1112 c.portid = nlh->nlmsg_pid;
1113 c.event = nlh->nlmsg_type;
1114 km_state_notify(x, &c);
1115
1116 out:
1117 xfrm_audit_state_delete(x, err ? 0 : 1, true);
1118 xfrm_state_put(x);
1119 return err;
1120 }
1121
copy_to_user_state(struct xfrm_state * x,struct xfrm_usersa_info * p)1122 static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
1123 {
1124 memset(p, 0, sizeof(*p));
1125 memcpy(&p->id, &x->id, sizeof(p->id));
1126 memcpy(&p->sel, &x->sel, sizeof(p->sel));
1127 memcpy(&p->lft, &x->lft, sizeof(p->lft));
1128 if (x->xso.dev)
1129 xfrm_dev_state_update_stats(x);
1130 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
1131 put_unaligned(x->stats.replay_window, &p->stats.replay_window);
1132 put_unaligned(x->stats.replay, &p->stats.replay);
1133 put_unaligned(x->stats.integrity_failed, &p->stats.integrity_failed);
1134 memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr));
1135 p->mode = x->props.mode;
1136 p->replay_window = x->props.replay_window;
1137 p->reqid = x->props.reqid;
1138 p->family = x->props.family;
1139 p->flags = x->props.flags;
1140 p->seq = x->km.seq;
1141 }
1142
1143 struct xfrm_dump_info {
1144 struct sk_buff *in_skb;
1145 struct sk_buff *out_skb;
1146 u32 nlmsg_seq;
1147 u16 nlmsg_flags;
1148 };
1149
copy_sec_ctx(struct xfrm_sec_ctx * s,struct sk_buff * skb)1150 static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
1151 {
1152 struct xfrm_user_sec_ctx *uctx;
1153 struct nlattr *attr;
1154 int ctx_size = sizeof(*uctx) + s->ctx_len;
1155
1156 attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size);
1157 if (attr == NULL)
1158 return -EMSGSIZE;
1159
1160 uctx = nla_data(attr);
1161 uctx->exttype = XFRMA_SEC_CTX;
1162 uctx->len = ctx_size;
1163 uctx->ctx_doi = s->ctx_doi;
1164 uctx->ctx_alg = s->ctx_alg;
1165 uctx->ctx_len = s->ctx_len;
1166 memcpy(uctx + 1, s->ctx_str, s->ctx_len);
1167
1168 return 0;
1169 }
1170
copy_user_offload(struct xfrm_dev_offload * xso,struct sk_buff * skb)1171 static int copy_user_offload(struct xfrm_dev_offload *xso, struct sk_buff *skb)
1172 {
1173 struct xfrm_user_offload *xuo;
1174 struct nlattr *attr;
1175
1176 attr = nla_reserve(skb, XFRMA_OFFLOAD_DEV, sizeof(*xuo));
1177 if (attr == NULL)
1178 return -EMSGSIZE;
1179
1180 xuo = nla_data(attr);
1181 memset(xuo, 0, sizeof(*xuo));
1182 xuo->ifindex = xso->dev->ifindex;
1183 if (xso->dir == XFRM_DEV_OFFLOAD_IN)
1184 xuo->flags = XFRM_OFFLOAD_INBOUND;
1185 if (xso->type == XFRM_DEV_OFFLOAD_PACKET)
1186 xuo->flags |= XFRM_OFFLOAD_PACKET;
1187
1188 return 0;
1189 }
1190
xfrm_redact(void)1191 static bool xfrm_redact(void)
1192 {
1193 return IS_ENABLED(CONFIG_SECURITY) &&
1194 security_locked_down(LOCKDOWN_XFRM_SECRET);
1195 }
1196
copy_to_user_auth(struct xfrm_algo_auth * auth,struct sk_buff * skb)1197 static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb)
1198 {
1199 struct xfrm_algo *algo;
1200 struct xfrm_algo_auth *ap;
1201 struct nlattr *nla;
1202 bool redact_secret = xfrm_redact();
1203
1204 nla = nla_reserve(skb, XFRMA_ALG_AUTH,
1205 sizeof(*algo) + (auth->alg_key_len + 7) / 8);
1206 if (!nla)
1207 return -EMSGSIZE;
1208 algo = nla_data(nla);
1209 strscpy_pad(algo->alg_name, auth->alg_name);
1210
1211 if (redact_secret && auth->alg_key_len)
1212 memset(algo->alg_key, 0, (auth->alg_key_len + 7) / 8);
1213 else
1214 memcpy(algo->alg_key, auth->alg_key,
1215 (auth->alg_key_len + 7) / 8);
1216 algo->alg_key_len = auth->alg_key_len;
1217
1218 nla = nla_reserve(skb, XFRMA_ALG_AUTH_TRUNC, xfrm_alg_auth_len(auth));
1219 if (!nla)
1220 return -EMSGSIZE;
1221 ap = nla_data(nla);
1222 strscpy_pad(ap->alg_name, auth->alg_name);
1223 ap->alg_key_len = auth->alg_key_len;
1224 ap->alg_trunc_len = auth->alg_trunc_len;
1225 if (redact_secret && auth->alg_key_len)
1226 memset(ap->alg_key, 0, (auth->alg_key_len + 7) / 8);
1227 else
1228 memcpy(ap->alg_key, auth->alg_key,
1229 (auth->alg_key_len + 7) / 8);
1230 return 0;
1231 }
1232
copy_to_user_aead(struct xfrm_algo_aead * aead,struct sk_buff * skb)1233 static int copy_to_user_aead(struct xfrm_algo_aead *aead, struct sk_buff *skb)
1234 {
1235 struct nlattr *nla = nla_reserve(skb, XFRMA_ALG_AEAD, aead_len(aead));
1236 struct xfrm_algo_aead *ap;
1237 bool redact_secret = xfrm_redact();
1238
1239 if (!nla)
1240 return -EMSGSIZE;
1241
1242 ap = nla_data(nla);
1243 strscpy_pad(ap->alg_name, aead->alg_name);
1244 ap->alg_key_len = aead->alg_key_len;
1245 ap->alg_icv_len = aead->alg_icv_len;
1246
1247 if (redact_secret && aead->alg_key_len)
1248 memset(ap->alg_key, 0, (aead->alg_key_len + 7) / 8);
1249 else
1250 memcpy(ap->alg_key, aead->alg_key,
1251 (aead->alg_key_len + 7) / 8);
1252 return 0;
1253 }
1254
copy_to_user_ealg(struct xfrm_algo * ealg,struct sk_buff * skb)1255 static int copy_to_user_ealg(struct xfrm_algo *ealg, struct sk_buff *skb)
1256 {
1257 struct xfrm_algo *ap;
1258 bool redact_secret = xfrm_redact();
1259 struct nlattr *nla = nla_reserve(skb, XFRMA_ALG_CRYPT,
1260 xfrm_alg_len(ealg));
1261 if (!nla)
1262 return -EMSGSIZE;
1263
1264 ap = nla_data(nla);
1265 strscpy_pad(ap->alg_name, ealg->alg_name);
1266 ap->alg_key_len = ealg->alg_key_len;
1267
1268 if (redact_secret && ealg->alg_key_len)
1269 memset(ap->alg_key, 0, (ealg->alg_key_len + 7) / 8);
1270 else
1271 memcpy(ap->alg_key, ealg->alg_key,
1272 (ealg->alg_key_len + 7) / 8);
1273
1274 return 0;
1275 }
1276
copy_to_user_calg(struct xfrm_algo * calg,struct sk_buff * skb)1277 static int copy_to_user_calg(struct xfrm_algo *calg, struct sk_buff *skb)
1278 {
1279 struct nlattr *nla = nla_reserve(skb, XFRMA_ALG_COMP, sizeof(*calg));
1280 struct xfrm_algo *ap;
1281
1282 if (!nla)
1283 return -EMSGSIZE;
1284
1285 ap = nla_data(nla);
1286 strscpy_pad(ap->alg_name, calg->alg_name);
1287 ap->alg_key_len = 0;
1288
1289 return 0;
1290 }
1291
copy_to_user_encap(struct xfrm_encap_tmpl * ep,struct sk_buff * skb)1292 static int copy_to_user_encap(struct xfrm_encap_tmpl *ep, struct sk_buff *skb)
1293 {
1294 struct nlattr *nla = nla_reserve(skb, XFRMA_ENCAP, sizeof(*ep));
1295 struct xfrm_encap_tmpl *uep;
1296
1297 if (!nla)
1298 return -EMSGSIZE;
1299
1300 uep = nla_data(nla);
1301 memset(uep, 0, sizeof(*uep));
1302
1303 uep->encap_type = ep->encap_type;
1304 uep->encap_sport = ep->encap_sport;
1305 uep->encap_dport = ep->encap_dport;
1306 uep->encap_oa = ep->encap_oa;
1307
1308 return 0;
1309 }
1310
xfrm_smark_put(struct sk_buff * skb,struct xfrm_mark * m)1311 static int xfrm_smark_put(struct sk_buff *skb, struct xfrm_mark *m)
1312 {
1313 int ret = 0;
1314
1315 if (m->v | m->m) {
1316 ret = nla_put_u32(skb, XFRMA_SET_MARK, m->v);
1317 if (!ret)
1318 ret = nla_put_u32(skb, XFRMA_SET_MARK_MASK, m->m);
1319 }
1320 return ret;
1321 }
1322
1323 /* Don't change this without updating xfrm_sa_len! */
copy_to_user_state_extra(struct xfrm_state * x,struct xfrm_usersa_info * p,struct sk_buff * skb)1324 static int copy_to_user_state_extra(struct xfrm_state *x,
1325 struct xfrm_usersa_info *p,
1326 struct sk_buff *skb)
1327 {
1328 int ret = 0;
1329
1330 copy_to_user_state(x, p);
1331
1332 if (x->props.extra_flags) {
1333 ret = nla_put_u32(skb, XFRMA_SA_EXTRA_FLAGS,
1334 x->props.extra_flags);
1335 if (ret)
1336 goto out;
1337 }
1338
1339 if (x->coaddr) {
1340 ret = nla_put(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);
1341 if (ret)
1342 goto out;
1343 }
1344 if (x->lastused) {
1345 ret = nla_put_u64_64bit(skb, XFRMA_LASTUSED, x->lastused,
1346 XFRMA_PAD);
1347 if (ret)
1348 goto out;
1349 }
1350 if (x->aead) {
1351 ret = copy_to_user_aead(x->aead, skb);
1352 if (ret)
1353 goto out;
1354 }
1355 if (x->aalg) {
1356 ret = copy_to_user_auth(x->aalg, skb);
1357 if (ret)
1358 goto out;
1359 }
1360 if (x->ealg) {
1361 ret = copy_to_user_ealg(x->ealg, skb);
1362 if (ret)
1363 goto out;
1364 }
1365 if (x->calg) {
1366 ret = copy_to_user_calg(x->calg, skb);
1367 if (ret)
1368 goto out;
1369 }
1370 if (x->encap) {
1371 ret = copy_to_user_encap(x->encap, skb);
1372 if (ret)
1373 goto out;
1374 }
1375 if (x->tfcpad) {
1376 ret = nla_put_u32(skb, XFRMA_TFCPAD, x->tfcpad);
1377 if (ret)
1378 goto out;
1379 }
1380 ret = xfrm_mark_put(skb, &x->mark);
1381 if (ret)
1382 goto out;
1383
1384 ret = xfrm_smark_put(skb, &x->props.smark);
1385 if (ret)
1386 goto out;
1387
1388 if (x->replay_esn)
1389 ret = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
1390 xfrm_replay_state_esn_len(x->replay_esn),
1391 x->replay_esn);
1392 else
1393 ret = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
1394 &x->replay);
1395 if (ret)
1396 goto out;
1397 if(x->xso.dev)
1398 ret = copy_user_offload(&x->xso, skb);
1399 if (ret)
1400 goto out;
1401 if (x->if_id) {
1402 ret = nla_put_u32(skb, XFRMA_IF_ID, x->if_id);
1403 if (ret)
1404 goto out;
1405 }
1406 if (x->security) {
1407 ret = copy_sec_ctx(x->security, skb);
1408 if (ret)
1409 goto out;
1410 }
1411 if (x->mode_cbs && x->mode_cbs->copy_to_user)
1412 ret = x->mode_cbs->copy_to_user(x, skb);
1413 if (ret)
1414 goto out;
1415 if (x->mapping_maxage) {
1416 ret = nla_put_u32(skb, XFRMA_MTIMER_THRESH, x->mapping_maxage);
1417 if (ret)
1418 goto out;
1419 }
1420 if (x->pcpu_num != UINT_MAX) {
1421 ret = nla_put_u32(skb, XFRMA_SA_PCPU, x->pcpu_num);
1422 if (ret)
1423 goto out;
1424 }
1425 if (x->dir)
1426 ret = nla_put_u8(skb, XFRMA_SA_DIR, x->dir);
1427
1428 if (x->nat_keepalive_interval) {
1429 ret = nla_put_u32(skb, XFRMA_NAT_KEEPALIVE_INTERVAL,
1430 x->nat_keepalive_interval);
1431 if (ret)
1432 goto out;
1433 }
1434 out:
1435 return ret;
1436 }
1437
dump_one_state(struct xfrm_state * x,int count,void * ptr)1438 static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
1439 {
1440 struct xfrm_dump_info *sp = ptr;
1441 struct sk_buff *in_skb = sp->in_skb;
1442 struct sk_buff *skb = sp->out_skb;
1443 struct xfrm_translator *xtr;
1444 struct xfrm_usersa_info *p;
1445 struct nlmsghdr *nlh;
1446 int err;
1447
1448 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
1449 XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags);
1450 if (nlh == NULL)
1451 return -EMSGSIZE;
1452
1453 p = nlmsg_data(nlh);
1454
1455 err = copy_to_user_state_extra(x, p, skb);
1456 if (err) {
1457 nlmsg_cancel(skb, nlh);
1458 return err;
1459 }
1460 nlmsg_end(skb, nlh);
1461
1462 xtr = xfrm_get_translator();
1463 if (xtr) {
1464 err = xtr->alloc_compat(skb, nlh);
1465
1466 xfrm_put_translator(xtr);
1467 if (err) {
1468 nlmsg_cancel(skb, nlh);
1469 return err;
1470 }
1471 }
1472
1473 return 0;
1474 }
1475
xfrm_dump_sa_done(struct netlink_callback * cb)1476 static int xfrm_dump_sa_done(struct netlink_callback *cb)
1477 {
1478 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
1479 struct sock *sk = cb->skb->sk;
1480 struct net *net = sock_net(sk);
1481
1482 if (cb->args[0])
1483 xfrm_state_walk_done(walk, net);
1484 return 0;
1485 }
1486
xfrm_dump_sa(struct sk_buff * skb,struct netlink_callback * cb)1487 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
1488 {
1489 struct net *net = sock_net(skb->sk);
1490 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
1491 struct xfrm_dump_info info;
1492
1493 BUILD_BUG_ON(sizeof(struct xfrm_state_walk) >
1494 sizeof(cb->args) - sizeof(cb->args[0]));
1495
1496 info.in_skb = cb->skb;
1497 info.out_skb = skb;
1498 info.nlmsg_seq = cb->nlh->nlmsg_seq;
1499 info.nlmsg_flags = NLM_F_MULTI;
1500
1501 if (!cb->args[0]) {
1502 struct nlattr *attrs[XFRMA_MAX+1];
1503 struct xfrm_address_filter *filter = NULL;
1504 u8 proto = 0;
1505 int err;
1506
1507 err = nlmsg_parse_deprecated(cb->nlh, 0, attrs, XFRMA_MAX,
1508 xfrma_policy, cb->extack);
1509 if (err < 0)
1510 return err;
1511
1512 if (attrs[XFRMA_ADDRESS_FILTER]) {
1513 filter = kmemdup(nla_data(attrs[XFRMA_ADDRESS_FILTER]),
1514 sizeof(*filter), GFP_KERNEL);
1515 if (filter == NULL)
1516 return -ENOMEM;
1517
1518 /* see addr_match(), (prefix length >> 5) << 2
1519 * will be used to compare xfrm_address_t
1520 */
1521 if (filter->splen > (sizeof(xfrm_address_t) << 3) ||
1522 filter->dplen > (sizeof(xfrm_address_t) << 3)) {
1523 kfree(filter);
1524 return -EINVAL;
1525 }
1526 }
1527
1528 if (attrs[XFRMA_PROTO])
1529 proto = nla_get_u8(attrs[XFRMA_PROTO]);
1530
1531 xfrm_state_walk_init(walk, proto, filter);
1532 cb->args[0] = 1;
1533 }
1534
1535 (void) xfrm_state_walk(net, walk, dump_one_state, &info);
1536
1537 return skb->len;
1538 }
1539
xfrm_state_netlink(struct sk_buff * in_skb,struct xfrm_state * x,u32 seq)1540 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
1541 struct xfrm_state *x, u32 seq)
1542 {
1543 struct xfrm_dump_info info;
1544 struct sk_buff *skb;
1545 int err;
1546
1547 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1548 if (!skb)
1549 return ERR_PTR(-ENOMEM);
1550
1551 info.in_skb = in_skb;
1552 info.out_skb = skb;
1553 info.nlmsg_seq = seq;
1554 info.nlmsg_flags = 0;
1555
1556 err = dump_one_state(x, 0, &info);
1557 if (err) {
1558 kfree_skb(skb);
1559 return ERR_PTR(err);
1560 }
1561
1562 return skb;
1563 }
1564
1565 /* A wrapper for nlmsg_multicast() checking that nlsk is still available.
1566 * Must be called with RCU read lock.
1567 */
xfrm_nlmsg_multicast(struct net * net,struct sk_buff * skb,u32 pid,unsigned int group)1568 static inline int xfrm_nlmsg_multicast(struct net *net, struct sk_buff *skb,
1569 u32 pid, unsigned int group)
1570 {
1571 struct sock *nlsk = rcu_dereference(net->xfrm.nlsk);
1572 struct xfrm_translator *xtr;
1573
1574 if (!nlsk) {
1575 kfree_skb(skb);
1576 return -EPIPE;
1577 }
1578
1579 xtr = xfrm_get_translator();
1580 if (xtr) {
1581 int err = xtr->alloc_compat(skb, nlmsg_hdr(skb));
1582
1583 xfrm_put_translator(xtr);
1584 if (err) {
1585 kfree_skb(skb);
1586 return err;
1587 }
1588 }
1589
1590 return nlmsg_multicast(nlsk, skb, pid, group, GFP_ATOMIC);
1591 }
1592
xfrm_spdinfo_msgsize(void)1593 static inline unsigned int xfrm_spdinfo_msgsize(void)
1594 {
1595 return NLMSG_ALIGN(4)
1596 + nla_total_size(sizeof(struct xfrmu_spdinfo))
1597 + nla_total_size(sizeof(struct xfrmu_spdhinfo))
1598 + nla_total_size(sizeof(struct xfrmu_spdhthresh))
1599 + nla_total_size(sizeof(struct xfrmu_spdhthresh));
1600 }
1601
build_spdinfo(struct sk_buff * skb,struct net * net,u32 portid,u32 seq,u32 flags)1602 static int build_spdinfo(struct sk_buff *skb, struct net *net,
1603 u32 portid, u32 seq, u32 flags)
1604 {
1605 struct xfrmk_spdinfo si;
1606 struct xfrmu_spdinfo spc;
1607 struct xfrmu_spdhinfo sph;
1608 struct xfrmu_spdhthresh spt4, spt6;
1609 struct nlmsghdr *nlh;
1610 int err;
1611 u32 *f;
1612 unsigned lseq;
1613
1614 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0);
1615 if (nlh == NULL) /* shouldn't really happen ... */
1616 return -EMSGSIZE;
1617
1618 f = nlmsg_data(nlh);
1619 *f = flags;
1620 xfrm_spd_getinfo(net, &si);
1621 spc.incnt = si.incnt;
1622 spc.outcnt = si.outcnt;
1623 spc.fwdcnt = si.fwdcnt;
1624 spc.inscnt = si.inscnt;
1625 spc.outscnt = si.outscnt;
1626 spc.fwdscnt = si.fwdscnt;
1627 sph.spdhcnt = si.spdhcnt;
1628 sph.spdhmcnt = si.spdhmcnt;
1629
1630 do {
1631 lseq = read_seqbegin(&net->xfrm.policy_hthresh.lock);
1632
1633 spt4.lbits = net->xfrm.policy_hthresh.lbits4;
1634 spt4.rbits = net->xfrm.policy_hthresh.rbits4;
1635 spt6.lbits = net->xfrm.policy_hthresh.lbits6;
1636 spt6.rbits = net->xfrm.policy_hthresh.rbits6;
1637 } while (read_seqretry(&net->xfrm.policy_hthresh.lock, lseq));
1638
1639 err = nla_put(skb, XFRMA_SPD_INFO, sizeof(spc), &spc);
1640 if (!err)
1641 err = nla_put(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph);
1642 if (!err)
1643 err = nla_put(skb, XFRMA_SPD_IPV4_HTHRESH, sizeof(spt4), &spt4);
1644 if (!err)
1645 err = nla_put(skb, XFRMA_SPD_IPV6_HTHRESH, sizeof(spt6), &spt6);
1646 if (err) {
1647 nlmsg_cancel(skb, nlh);
1648 return err;
1649 }
1650
1651 nlmsg_end(skb, nlh);
1652 return 0;
1653 }
1654
xfrm_set_spdinfo(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs,struct netlink_ext_ack * extack)1655 static int xfrm_set_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1656 struct nlattr **attrs,
1657 struct netlink_ext_ack *extack)
1658 {
1659 struct net *net = sock_net(skb->sk);
1660 struct xfrmu_spdhthresh *thresh4 = NULL;
1661 struct xfrmu_spdhthresh *thresh6 = NULL;
1662
1663 /* selector prefixlen thresholds to hash policies */
1664 if (attrs[XFRMA_SPD_IPV4_HTHRESH]) {
1665 struct nlattr *rta = attrs[XFRMA_SPD_IPV4_HTHRESH];
1666
1667 if (nla_len(rta) < sizeof(*thresh4)) {
1668 NL_SET_ERR_MSG(extack, "Invalid SPD_IPV4_HTHRESH attribute length");
1669 return -EINVAL;
1670 }
1671 thresh4 = nla_data(rta);
1672 if (thresh4->lbits > 32 || thresh4->rbits > 32) {
1673 NL_SET_ERR_MSG(extack, "Invalid hash threshold (must be <= 32 for IPv4)");
1674 return -EINVAL;
1675 }
1676 }
1677 if (attrs[XFRMA_SPD_IPV6_HTHRESH]) {
1678 struct nlattr *rta = attrs[XFRMA_SPD_IPV6_HTHRESH];
1679
1680 if (nla_len(rta) < sizeof(*thresh6)) {
1681 NL_SET_ERR_MSG(extack, "Invalid SPD_IPV6_HTHRESH attribute length");
1682 return -EINVAL;
1683 }
1684 thresh6 = nla_data(rta);
1685 if (thresh6->lbits > 128 || thresh6->rbits > 128) {
1686 NL_SET_ERR_MSG(extack, "Invalid hash threshold (must be <= 128 for IPv6)");
1687 return -EINVAL;
1688 }
1689 }
1690
1691 if (thresh4 || thresh6) {
1692 write_seqlock(&net->xfrm.policy_hthresh.lock);
1693 if (thresh4) {
1694 net->xfrm.policy_hthresh.lbits4 = thresh4->lbits;
1695 net->xfrm.policy_hthresh.rbits4 = thresh4->rbits;
1696 }
1697 if (thresh6) {
1698 net->xfrm.policy_hthresh.lbits6 = thresh6->lbits;
1699 net->xfrm.policy_hthresh.rbits6 = thresh6->rbits;
1700 }
1701 write_sequnlock(&net->xfrm.policy_hthresh.lock);
1702
1703 xfrm_policy_hash_rebuild(net);
1704 }
1705
1706 return 0;
1707 }
1708
xfrm_get_spdinfo(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs,struct netlink_ext_ack * extack)1709 static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1710 struct nlattr **attrs,
1711 struct netlink_ext_ack *extack)
1712 {
1713 struct net *net = sock_net(skb->sk);
1714 struct sk_buff *r_skb;
1715 u32 *flags = nlmsg_data(nlh);
1716 u32 sportid = NETLINK_CB(skb).portid;
1717 u32 seq = nlh->nlmsg_seq;
1718 int err;
1719
1720 r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC);
1721 if (r_skb == NULL)
1722 return -ENOMEM;
1723
1724 err = build_spdinfo(r_skb, net, sportid, seq, *flags);
1725 BUG_ON(err < 0);
1726
1727 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1728 }
1729
xfrm_sadinfo_msgsize(void)1730 static inline unsigned int xfrm_sadinfo_msgsize(void)
1731 {
1732 return NLMSG_ALIGN(4)
1733 + nla_total_size(sizeof(struct xfrmu_sadhinfo))
1734 + nla_total_size(4); /* XFRMA_SAD_CNT */
1735 }
1736
build_sadinfo(struct sk_buff * skb,struct net * net,u32 portid,u32 seq,u32 flags)1737 static int build_sadinfo(struct sk_buff *skb, struct net *net,
1738 u32 portid, u32 seq, u32 flags)
1739 {
1740 struct xfrmk_sadinfo si;
1741 struct xfrmu_sadhinfo sh;
1742 struct nlmsghdr *nlh;
1743 int err;
1744 u32 *f;
1745
1746 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0);
1747 if (nlh == NULL) /* shouldn't really happen ... */
1748 return -EMSGSIZE;
1749
1750 f = nlmsg_data(nlh);
1751 *f = flags;
1752 xfrm_sad_getinfo(net, &si);
1753
1754 sh.sadhmcnt = si.sadhmcnt;
1755 sh.sadhcnt = si.sadhcnt;
1756
1757 err = nla_put_u32(skb, XFRMA_SAD_CNT, si.sadcnt);
1758 if (!err)
1759 err = nla_put(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh);
1760 if (err) {
1761 nlmsg_cancel(skb, nlh);
1762 return err;
1763 }
1764
1765 nlmsg_end(skb, nlh);
1766 return 0;
1767 }
1768
xfrm_get_sadinfo(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs,struct netlink_ext_ack * extack)1769 static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1770 struct nlattr **attrs,
1771 struct netlink_ext_ack *extack)
1772 {
1773 struct net *net = sock_net(skb->sk);
1774 struct sk_buff *r_skb;
1775 u32 *flags = nlmsg_data(nlh);
1776 u32 sportid = NETLINK_CB(skb).portid;
1777 u32 seq = nlh->nlmsg_seq;
1778 int err;
1779
1780 r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC);
1781 if (r_skb == NULL)
1782 return -ENOMEM;
1783
1784 err = build_sadinfo(r_skb, net, sportid, seq, *flags);
1785 BUG_ON(err < 0);
1786
1787 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1788 }
1789
xfrm_get_sa(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs,struct netlink_ext_ack * extack)1790 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1791 struct nlattr **attrs, struct netlink_ext_ack *extack)
1792 {
1793 struct net *net = sock_net(skb->sk);
1794 struct xfrm_usersa_id *p = nlmsg_data(nlh);
1795 struct xfrm_state *x;
1796 struct sk_buff *resp_skb;
1797 int err = -ESRCH;
1798
1799 x = xfrm_user_state_lookup(net, p, attrs, &err);
1800 if (x == NULL)
1801 goto out_noput;
1802
1803 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1804 if (IS_ERR(resp_skb)) {
1805 err = PTR_ERR(resp_skb);
1806 } else {
1807 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1808 }
1809 xfrm_state_put(x);
1810 out_noput:
1811 return err;
1812 }
1813
xfrm_alloc_userspi(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs,struct netlink_ext_ack * extack)1814 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
1815 struct nlattr **attrs,
1816 struct netlink_ext_ack *extack)
1817 {
1818 struct net *net = sock_net(skb->sk);
1819 struct xfrm_state *x;
1820 struct xfrm_userspi_info *p;
1821 struct xfrm_translator *xtr;
1822 struct sk_buff *resp_skb;
1823 xfrm_address_t *daddr;
1824 int family;
1825 int err;
1826 u32 mark;
1827 struct xfrm_mark m;
1828 u32 if_id = 0;
1829 u32 pcpu_num = UINT_MAX;
1830
1831 p = nlmsg_data(nlh);
1832 err = verify_spi_info(p->info.id.proto, p->min, p->max, extack);
1833 if (err)
1834 goto out_noput;
1835
1836 family = p->info.family;
1837 daddr = &p->info.id.daddr;
1838
1839 x = NULL;
1840
1841 mark = xfrm_mark_get(attrs, &m);
1842
1843 if (attrs[XFRMA_IF_ID])
1844 if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
1845
1846 if (attrs[XFRMA_SA_PCPU]) {
1847 pcpu_num = nla_get_u32(attrs[XFRMA_SA_PCPU]);
1848 if (pcpu_num >= num_possible_cpus()) {
1849 err = -EINVAL;
1850 goto out_noput;
1851 }
1852 }
1853
1854 if (p->info.seq) {
1855 x = xfrm_find_acq_byseq(net, mark, p->info.seq, pcpu_num);
1856 if (x && !xfrm_addr_equal(&x->id.daddr, daddr, family)) {
1857 xfrm_state_put(x);
1858 x = NULL;
1859 }
1860 }
1861
1862 if (!x)
1863 x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid,
1864 if_id, pcpu_num, p->info.id.proto, daddr,
1865 &p->info.saddr, 1,
1866 family);
1867 err = -ENOENT;
1868 if (!x) {
1869 NL_SET_ERR_MSG(extack, "Target ACQUIRE not found");
1870 goto out_noput;
1871 }
1872
1873 err = xfrm_alloc_spi(x, p->min, p->max, extack);
1874 if (err)
1875 goto out;
1876
1877 if (attrs[XFRMA_SA_DIR])
1878 x->dir = nla_get_u8(attrs[XFRMA_SA_DIR]);
1879
1880 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1881 if (IS_ERR(resp_skb)) {
1882 err = PTR_ERR(resp_skb);
1883 goto out;
1884 }
1885
1886 xtr = xfrm_get_translator();
1887 if (xtr) {
1888 err = xtr->alloc_compat(skb, nlmsg_hdr(skb));
1889
1890 xfrm_put_translator(xtr);
1891 if (err) {
1892 kfree_skb(resp_skb);
1893 goto out;
1894 }
1895 }
1896
1897 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1898
1899 out:
1900 xfrm_state_put(x);
1901 out_noput:
1902 return err;
1903 }
1904
verify_policy_dir(u8 dir,struct netlink_ext_ack * extack)1905 static int verify_policy_dir(u8 dir, struct netlink_ext_ack *extack)
1906 {
1907 switch (dir) {
1908 case XFRM_POLICY_IN:
1909 case XFRM_POLICY_OUT:
1910 case XFRM_POLICY_FWD:
1911 break;
1912
1913 default:
1914 NL_SET_ERR_MSG(extack, "Invalid policy direction");
1915 return -EINVAL;
1916 }
1917
1918 return 0;
1919 }
1920
verify_policy_type(u8 type,struct netlink_ext_ack * extack)1921 static int verify_policy_type(u8 type, struct netlink_ext_ack *extack)
1922 {
1923 switch (type) {
1924 case XFRM_POLICY_TYPE_MAIN:
1925 #ifdef CONFIG_XFRM_SUB_POLICY
1926 case XFRM_POLICY_TYPE_SUB:
1927 #endif
1928 break;
1929
1930 default:
1931 NL_SET_ERR_MSG(extack, "Invalid policy type");
1932 return -EINVAL;
1933 }
1934
1935 return 0;
1936 }
1937
verify_newpolicy_info(struct xfrm_userpolicy_info * p,struct netlink_ext_ack * extack)1938 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p,
1939 struct netlink_ext_ack *extack)
1940 {
1941 int ret;
1942
1943 switch (p->share) {
1944 case XFRM_SHARE_ANY:
1945 case XFRM_SHARE_SESSION:
1946 case XFRM_SHARE_USER:
1947 case XFRM_SHARE_UNIQUE:
1948 break;
1949
1950 default:
1951 NL_SET_ERR_MSG(extack, "Invalid policy share");
1952 return -EINVAL;
1953 }
1954
1955 switch (p->action) {
1956 case XFRM_POLICY_ALLOW:
1957 case XFRM_POLICY_BLOCK:
1958 break;
1959
1960 default:
1961 NL_SET_ERR_MSG(extack, "Invalid policy action");
1962 return -EINVAL;
1963 }
1964
1965 switch (p->sel.family) {
1966 case AF_INET:
1967 if (p->sel.prefixlen_d > 32 || p->sel.prefixlen_s > 32) {
1968 NL_SET_ERR_MSG(extack, "Invalid prefix length in selector (must be <= 32 for IPv4)");
1969 return -EINVAL;
1970 }
1971
1972 break;
1973
1974 case AF_INET6:
1975 #if IS_ENABLED(CONFIG_IPV6)
1976 if (p->sel.prefixlen_d > 128 || p->sel.prefixlen_s > 128) {
1977 NL_SET_ERR_MSG(extack, "Invalid prefix length in selector (must be <= 128 for IPv6)");
1978 return -EINVAL;
1979 }
1980
1981 break;
1982 #else
1983 NL_SET_ERR_MSG(extack, "IPv6 support disabled");
1984 return -EAFNOSUPPORT;
1985 #endif
1986
1987 default:
1988 NL_SET_ERR_MSG(extack, "Invalid selector family");
1989 return -EINVAL;
1990 }
1991
1992 ret = verify_policy_dir(p->dir, extack);
1993 if (ret)
1994 return ret;
1995 if (p->index && (xfrm_policy_id2dir(p->index) != p->dir)) {
1996 NL_SET_ERR_MSG(extack, "Policy index doesn't match direction");
1997 return -EINVAL;
1998 }
1999
2000 return 0;
2001 }
2002
copy_from_user_sec_ctx(struct xfrm_policy * pol,struct nlattr ** attrs)2003 static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs)
2004 {
2005 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
2006 struct xfrm_user_sec_ctx *uctx;
2007
2008 if (!rt)
2009 return 0;
2010
2011 uctx = nla_data(rt);
2012 return security_xfrm_policy_alloc(&pol->security, uctx, GFP_KERNEL);
2013 }
2014
copy_templates(struct xfrm_policy * xp,struct xfrm_user_tmpl * ut,int nr)2015 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
2016 int nr)
2017 {
2018 int i;
2019
2020 xp->xfrm_nr = nr;
2021 for (i = 0; i < nr; i++, ut++) {
2022 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
2023
2024 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
2025 memcpy(&t->saddr, &ut->saddr,
2026 sizeof(xfrm_address_t));
2027 t->reqid = ut->reqid;
2028 t->mode = ut->mode;
2029 t->share = ut->share;
2030 t->optional = ut->optional;
2031 t->aalgos = ut->aalgos;
2032 t->ealgos = ut->ealgos;
2033 t->calgos = ut->calgos;
2034 /* If all masks are ~0, then we allow all algorithms. */
2035 t->allalgs = !~(t->aalgos & t->ealgos & t->calgos);
2036 t->encap_family = ut->family;
2037 }
2038 }
2039
validate_tmpl(int nr,struct xfrm_user_tmpl * ut,u16 family,int dir,struct netlink_ext_ack * extack)2040 static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family,
2041 int dir, struct netlink_ext_ack *extack)
2042 {
2043 u16 prev_family;
2044 int i;
2045
2046 if (nr > XFRM_MAX_DEPTH) {
2047 NL_SET_ERR_MSG(extack, "Template count must be <= XFRM_MAX_DEPTH (" __stringify(XFRM_MAX_DEPTH) ")");
2048 return -EINVAL;
2049 }
2050
2051 prev_family = family;
2052
2053 for (i = 0; i < nr; i++) {
2054 /* We never validated the ut->family value, so many
2055 * applications simply leave it at zero. The check was
2056 * never made and ut->family was ignored because all
2057 * templates could be assumed to have the same family as
2058 * the policy itself. Now that we will have ipv4-in-ipv6
2059 * and ipv6-in-ipv4 tunnels, this is no longer true.
2060 */
2061 if (!ut[i].family)
2062 ut[i].family = family;
2063
2064 switch (ut[i].mode) {
2065 case XFRM_MODE_TUNNEL:
2066 case XFRM_MODE_BEET:
2067 if (ut[i].optional && dir == XFRM_POLICY_OUT) {
2068 NL_SET_ERR_MSG(extack, "Mode in optional template not allowed in outbound policy");
2069 return -EINVAL;
2070 }
2071 break;
2072 case XFRM_MODE_IPTFS:
2073 break;
2074 default:
2075 if (ut[i].family != prev_family) {
2076 NL_SET_ERR_MSG(extack, "Mode in template doesn't support a family change");
2077 return -EINVAL;
2078 }
2079 break;
2080 }
2081 if (ut[i].mode >= XFRM_MODE_MAX) {
2082 NL_SET_ERR_MSG(extack, "Mode in template must be < XFRM_MODE_MAX (" __stringify(XFRM_MODE_MAX) ")");
2083 return -EINVAL;
2084 }
2085
2086 prev_family = ut[i].family;
2087
2088 switch (ut[i].family) {
2089 case AF_INET:
2090 break;
2091 #if IS_ENABLED(CONFIG_IPV6)
2092 case AF_INET6:
2093 break;
2094 #endif
2095 default:
2096 NL_SET_ERR_MSG(extack, "Invalid family in template");
2097 return -EINVAL;
2098 }
2099
2100 if (!xfrm_id_proto_valid(ut[i].id.proto)) {
2101 NL_SET_ERR_MSG(extack, "Invalid XFRM protocol in template");
2102 return -EINVAL;
2103 }
2104 }
2105
2106 return 0;
2107 }
2108
copy_from_user_tmpl(struct xfrm_policy * pol,struct nlattr ** attrs,int dir,struct netlink_ext_ack * extack)2109 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs,
2110 int dir, struct netlink_ext_ack *extack)
2111 {
2112 struct nlattr *rt = attrs[XFRMA_TMPL];
2113
2114 if (!rt) {
2115 pol->xfrm_nr = 0;
2116 } else {
2117 struct xfrm_user_tmpl *utmpl = nla_data(rt);
2118 int nr = nla_len(rt) / sizeof(*utmpl);
2119 int err;
2120
2121 err = validate_tmpl(nr, utmpl, pol->family, dir, extack);
2122 if (err)
2123 return err;
2124
2125 copy_templates(pol, utmpl, nr);
2126 }
2127 return 0;
2128 }
2129
copy_from_user_policy_type(u8 * tp,struct nlattr ** attrs,struct netlink_ext_ack * extack)2130 static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs,
2131 struct netlink_ext_ack *extack)
2132 {
2133 struct nlattr *rt = attrs[XFRMA_POLICY_TYPE];
2134 struct xfrm_userpolicy_type *upt;
2135 u8 type = XFRM_POLICY_TYPE_MAIN;
2136 int err;
2137
2138 if (rt) {
2139 upt = nla_data(rt);
2140 type = upt->type;
2141 }
2142
2143 err = verify_policy_type(type, extack);
2144 if (err)
2145 return err;
2146
2147 *tp = type;
2148 return 0;
2149 }
2150
copy_from_user_policy(struct xfrm_policy * xp,struct xfrm_userpolicy_info * p)2151 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
2152 {
2153 xp->priority = p->priority;
2154 xp->index = p->index;
2155 memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
2156 memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
2157 xp->action = p->action;
2158 xp->flags = p->flags;
2159 xp->family = p->sel.family;
2160 /* XXX xp->share = p->share; */
2161 }
2162
copy_to_user_policy(struct xfrm_policy * xp,struct xfrm_userpolicy_info * p,int dir)2163 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
2164 {
2165 memset(p, 0, sizeof(*p));
2166 memcpy(&p->sel, &xp->selector, sizeof(p->sel));
2167 memcpy(&p->lft, &xp->lft, sizeof(p->lft));
2168 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
2169 p->priority = xp->priority;
2170 p->index = xp->index;
2171 p->sel.family = xp->family;
2172 p->dir = dir;
2173 p->action = xp->action;
2174 p->flags = xp->flags;
2175 p->share = XFRM_SHARE_ANY; /* XXX xp->share */
2176 }
2177
xfrm_policy_construct(struct net * net,struct xfrm_userpolicy_info * p,struct nlattr ** attrs,int * errp,struct netlink_ext_ack * extack)2178 static struct xfrm_policy *xfrm_policy_construct(struct net *net,
2179 struct xfrm_userpolicy_info *p,
2180 struct nlattr **attrs,
2181 int *errp,
2182 struct netlink_ext_ack *extack)
2183 {
2184 struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL);
2185 int err;
2186
2187 if (!xp) {
2188 *errp = -ENOMEM;
2189 return NULL;
2190 }
2191
2192 copy_from_user_policy(xp, p);
2193
2194 err = copy_from_user_policy_type(&xp->type, attrs, extack);
2195 if (err)
2196 goto error;
2197
2198 if (!(err = copy_from_user_tmpl(xp, attrs, p->dir, extack)))
2199 err = copy_from_user_sec_ctx(xp, attrs);
2200 if (err)
2201 goto error;
2202
2203 xfrm_mark_get(attrs, &xp->mark);
2204
2205 if (attrs[XFRMA_IF_ID])
2206 xp->if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
2207
2208 /* configure the hardware if offload is requested */
2209 if (attrs[XFRMA_OFFLOAD_DEV]) {
2210 err = xfrm_dev_policy_add(net, xp,
2211 nla_data(attrs[XFRMA_OFFLOAD_DEV]),
2212 p->dir, extack);
2213 if (err)
2214 goto error;
2215 }
2216
2217 return xp;
2218 error:
2219 *errp = err;
2220 xp->walk.dead = 1;
2221 xfrm_policy_destroy(xp);
2222 return NULL;
2223 }
2224
xfrm_add_policy(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs,struct netlink_ext_ack * extack)2225 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
2226 struct nlattr **attrs,
2227 struct netlink_ext_ack *extack)
2228 {
2229 struct net *net = sock_net(skb->sk);
2230 struct xfrm_userpolicy_info *p = nlmsg_data(nlh);
2231 struct xfrm_policy *xp;
2232 struct km_event c;
2233 int err;
2234 int excl;
2235
2236 err = verify_newpolicy_info(p, extack);
2237 if (err)
2238 return err;
2239 err = verify_sec_ctx_len(attrs, extack);
2240 if (err)
2241 return err;
2242
2243 xp = xfrm_policy_construct(net, p, attrs, &err, extack);
2244 if (!xp)
2245 return err;
2246
2247 /* shouldn't excl be based on nlh flags??
2248 * Aha! this is anti-netlink really i.e more pfkey derived
2249 * in netlink excl is a flag and you wouldn't need
2250 * a type XFRM_MSG_UPDPOLICY - JHS */
2251 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
2252 err = xfrm_policy_insert(p->dir, xp, excl);
2253 xfrm_audit_policy_add(xp, err ? 0 : 1, true);
2254
2255 if (err) {
2256 xfrm_dev_policy_delete(xp);
2257 xfrm_dev_policy_free(xp);
2258 security_xfrm_policy_free(xp->security);
2259 kfree(xp);
2260 return err;
2261 }
2262
2263 c.event = nlh->nlmsg_type;
2264 c.seq = nlh->nlmsg_seq;
2265 c.portid = nlh->nlmsg_pid;
2266 km_policy_notify(xp, p->dir, &c);
2267
2268 xfrm_pol_put(xp);
2269
2270 return 0;
2271 }
2272
copy_to_user_tmpl(struct xfrm_policy * xp,struct sk_buff * skb)2273 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
2274 {
2275 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
2276 int i;
2277
2278 if (xp->xfrm_nr == 0)
2279 return 0;
2280
2281 if (xp->xfrm_nr > XFRM_MAX_DEPTH)
2282 return -ENOBUFS;
2283
2284 for (i = 0; i < xp->xfrm_nr; i++) {
2285 struct xfrm_user_tmpl *up = &vec[i];
2286 struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
2287
2288 memset(up, 0, sizeof(*up));
2289 memcpy(&up->id, &kp->id, sizeof(up->id));
2290 up->family = kp->encap_family;
2291 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
2292 up->reqid = kp->reqid;
2293 up->mode = kp->mode;
2294 up->share = kp->share;
2295 up->optional = kp->optional;
2296 up->aalgos = kp->aalgos;
2297 up->ealgos = kp->ealgos;
2298 up->calgos = kp->calgos;
2299 }
2300
2301 return nla_put(skb, XFRMA_TMPL,
2302 sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec);
2303 }
2304
copy_to_user_state_sec_ctx(struct xfrm_state * x,struct sk_buff * skb)2305 static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
2306 {
2307 if (x->security) {
2308 return copy_sec_ctx(x->security, skb);
2309 }
2310 return 0;
2311 }
2312
copy_to_user_sec_ctx(struct xfrm_policy * xp,struct sk_buff * skb)2313 static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
2314 {
2315 if (xp->security)
2316 return copy_sec_ctx(xp->security, skb);
2317 return 0;
2318 }
userpolicy_type_attrsize(void)2319 static inline unsigned int userpolicy_type_attrsize(void)
2320 {
2321 #ifdef CONFIG_XFRM_SUB_POLICY
2322 return nla_total_size(sizeof(struct xfrm_userpolicy_type));
2323 #else
2324 return 0;
2325 #endif
2326 }
2327
2328 #ifdef CONFIG_XFRM_SUB_POLICY
copy_to_user_policy_type(u8 type,struct sk_buff * skb)2329 static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
2330 {
2331 struct xfrm_userpolicy_type upt;
2332
2333 /* Sadly there are two holes in struct xfrm_userpolicy_type */
2334 memset(&upt, 0, sizeof(upt));
2335 upt.type = type;
2336
2337 return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
2338 }
2339
2340 #else
copy_to_user_policy_type(u8 type,struct sk_buff * skb)2341 static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
2342 {
2343 return 0;
2344 }
2345 #endif
2346
dump_one_policy(struct xfrm_policy * xp,int dir,int count,void * ptr)2347 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
2348 {
2349 struct xfrm_dump_info *sp = ptr;
2350 struct xfrm_userpolicy_info *p;
2351 struct sk_buff *in_skb = sp->in_skb;
2352 struct sk_buff *skb = sp->out_skb;
2353 struct xfrm_translator *xtr;
2354 struct nlmsghdr *nlh;
2355 int err;
2356
2357 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
2358 XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags);
2359 if (nlh == NULL)
2360 return -EMSGSIZE;
2361
2362 p = nlmsg_data(nlh);
2363 copy_to_user_policy(xp, p, dir);
2364 err = copy_to_user_tmpl(xp, skb);
2365 if (!err)
2366 err = copy_to_user_sec_ctx(xp, skb);
2367 if (!err)
2368 err = copy_to_user_policy_type(xp->type, skb);
2369 if (!err)
2370 err = xfrm_mark_put(skb, &xp->mark);
2371 if (!err)
2372 err = xfrm_if_id_put(skb, xp->if_id);
2373 if (!err && xp->xdo.dev)
2374 err = copy_user_offload(&xp->xdo, skb);
2375 if (err) {
2376 nlmsg_cancel(skb, nlh);
2377 return err;
2378 }
2379 nlmsg_end(skb, nlh);
2380
2381 xtr = xfrm_get_translator();
2382 if (xtr) {
2383 err = xtr->alloc_compat(skb, nlh);
2384
2385 xfrm_put_translator(xtr);
2386 if (err) {
2387 nlmsg_cancel(skb, nlh);
2388 return err;
2389 }
2390 }
2391
2392 return 0;
2393 }
2394
xfrm_dump_policy_done(struct netlink_callback * cb)2395 static int xfrm_dump_policy_done(struct netlink_callback *cb)
2396 {
2397 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
2398 struct net *net = sock_net(cb->skb->sk);
2399
2400 xfrm_policy_walk_done(walk, net);
2401 return 0;
2402 }
2403
xfrm_dump_policy_start(struct netlink_callback * cb)2404 static int xfrm_dump_policy_start(struct netlink_callback *cb)
2405 {
2406 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
2407
2408 BUILD_BUG_ON(sizeof(*walk) > sizeof(cb->args));
2409
2410 xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY);
2411 return 0;
2412 }
2413
xfrm_dump_policy(struct sk_buff * skb,struct netlink_callback * cb)2414 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
2415 {
2416 struct net *net = sock_net(skb->sk);
2417 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
2418 struct xfrm_dump_info info;
2419
2420 info.in_skb = cb->skb;
2421 info.out_skb = skb;
2422 info.nlmsg_seq = cb->nlh->nlmsg_seq;
2423 info.nlmsg_flags = NLM_F_MULTI;
2424
2425 (void) xfrm_policy_walk(net, walk, dump_one_policy, &info);
2426
2427 return skb->len;
2428 }
2429
xfrm_policy_netlink(struct sk_buff * in_skb,struct xfrm_policy * xp,int dir,u32 seq)2430 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
2431 struct xfrm_policy *xp,
2432 int dir, u32 seq)
2433 {
2434 struct xfrm_dump_info info;
2435 struct sk_buff *skb;
2436 int err;
2437
2438 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2439 if (!skb)
2440 return ERR_PTR(-ENOMEM);
2441
2442 info.in_skb = in_skb;
2443 info.out_skb = skb;
2444 info.nlmsg_seq = seq;
2445 info.nlmsg_flags = 0;
2446
2447 err = dump_one_policy(xp, dir, 0, &info);
2448 if (err) {
2449 kfree_skb(skb);
2450 return ERR_PTR(err);
2451 }
2452
2453 return skb;
2454 }
2455
xfrm_notify_userpolicy(struct net * net)2456 static int xfrm_notify_userpolicy(struct net *net)
2457 {
2458 struct xfrm_userpolicy_default *up;
2459 int len = NLMSG_ALIGN(sizeof(*up));
2460 struct nlmsghdr *nlh;
2461 struct sk_buff *skb;
2462 int err;
2463
2464 skb = nlmsg_new(len, GFP_ATOMIC);
2465 if (skb == NULL)
2466 return -ENOMEM;
2467
2468 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_GETDEFAULT, sizeof(*up), 0);
2469 if (nlh == NULL) {
2470 kfree_skb(skb);
2471 return -EMSGSIZE;
2472 }
2473
2474 up = nlmsg_data(nlh);
2475 up->in = net->xfrm.policy_default[XFRM_POLICY_IN];
2476 up->fwd = net->xfrm.policy_default[XFRM_POLICY_FWD];
2477 up->out = net->xfrm.policy_default[XFRM_POLICY_OUT];
2478
2479 nlmsg_end(skb, nlh);
2480
2481 rcu_read_lock();
2482 err = xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
2483 rcu_read_unlock();
2484
2485 return err;
2486 }
2487
xfrm_userpolicy_is_valid(__u8 policy)2488 static bool xfrm_userpolicy_is_valid(__u8 policy)
2489 {
2490 return policy == XFRM_USERPOLICY_BLOCK ||
2491 policy == XFRM_USERPOLICY_ACCEPT;
2492 }
2493
xfrm_set_default(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs,struct netlink_ext_ack * extack)2494 static int xfrm_set_default(struct sk_buff *skb, struct nlmsghdr *nlh,
2495 struct nlattr **attrs, struct netlink_ext_ack *extack)
2496 {
2497 struct net *net = sock_net(skb->sk);
2498 struct xfrm_userpolicy_default *up = nlmsg_data(nlh);
2499
2500 if (xfrm_userpolicy_is_valid(up->in))
2501 net->xfrm.policy_default[XFRM_POLICY_IN] = up->in;
2502
2503 if (xfrm_userpolicy_is_valid(up->fwd))
2504 net->xfrm.policy_default[XFRM_POLICY_FWD] = up->fwd;
2505
2506 if (xfrm_userpolicy_is_valid(up->out))
2507 net->xfrm.policy_default[XFRM_POLICY_OUT] = up->out;
2508
2509 rt_genid_bump_all(net);
2510
2511 xfrm_notify_userpolicy(net);
2512 return 0;
2513 }
2514
xfrm_get_default(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs,struct netlink_ext_ack * extack)2515 static int xfrm_get_default(struct sk_buff *skb, struct nlmsghdr *nlh,
2516 struct nlattr **attrs, struct netlink_ext_ack *extack)
2517 {
2518 struct sk_buff *r_skb;
2519 struct nlmsghdr *r_nlh;
2520 struct net *net = sock_net(skb->sk);
2521 struct xfrm_userpolicy_default *r_up;
2522 int len = NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_default));
2523 u32 portid = NETLINK_CB(skb).portid;
2524 u32 seq = nlh->nlmsg_seq;
2525
2526 r_skb = nlmsg_new(len, GFP_ATOMIC);
2527 if (!r_skb)
2528 return -ENOMEM;
2529
2530 r_nlh = nlmsg_put(r_skb, portid, seq, XFRM_MSG_GETDEFAULT, sizeof(*r_up), 0);
2531 if (!r_nlh) {
2532 kfree_skb(r_skb);
2533 return -EMSGSIZE;
2534 }
2535
2536 r_up = nlmsg_data(r_nlh);
2537 r_up->in = net->xfrm.policy_default[XFRM_POLICY_IN];
2538 r_up->fwd = net->xfrm.policy_default[XFRM_POLICY_FWD];
2539 r_up->out = net->xfrm.policy_default[XFRM_POLICY_OUT];
2540 nlmsg_end(r_skb, r_nlh);
2541
2542 return nlmsg_unicast(net->xfrm.nlsk, r_skb, portid);
2543 }
2544
xfrm_get_policy(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs,struct netlink_ext_ack * extack)2545 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
2546 struct nlattr **attrs,
2547 struct netlink_ext_ack *extack)
2548 {
2549 struct net *net = sock_net(skb->sk);
2550 struct xfrm_policy *xp;
2551 struct xfrm_userpolicy_id *p;
2552 u8 type = XFRM_POLICY_TYPE_MAIN;
2553 int err;
2554 struct km_event c;
2555 int delete;
2556 struct xfrm_mark m;
2557 u32 if_id = 0;
2558
2559 p = nlmsg_data(nlh);
2560 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
2561
2562 err = copy_from_user_policy_type(&type, attrs, extack);
2563 if (err)
2564 return err;
2565
2566 err = verify_policy_dir(p->dir, extack);
2567 if (err)
2568 return err;
2569
2570 if (attrs[XFRMA_IF_ID])
2571 if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
2572
2573 xfrm_mark_get(attrs, &m);
2574
2575 if (p->index)
2576 xp = xfrm_policy_byid(net, &m, if_id, type, p->dir,
2577 p->index, delete, &err);
2578 else {
2579 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
2580 struct xfrm_sec_ctx *ctx;
2581
2582 err = verify_sec_ctx_len(attrs, extack);
2583 if (err)
2584 return err;
2585
2586 ctx = NULL;
2587 if (rt) {
2588 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
2589
2590 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
2591 if (err)
2592 return err;
2593 }
2594 xp = xfrm_policy_bysel_ctx(net, &m, if_id, type, p->dir,
2595 &p->sel, ctx, delete, &err);
2596 security_xfrm_policy_free(ctx);
2597 }
2598 if (xp == NULL)
2599 return -ENOENT;
2600
2601 if (!delete) {
2602 struct sk_buff *resp_skb;
2603
2604 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
2605 if (IS_ERR(resp_skb)) {
2606 err = PTR_ERR(resp_skb);
2607 } else {
2608 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb,
2609 NETLINK_CB(skb).portid);
2610 }
2611 } else {
2612 xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
2613
2614 if (err != 0)
2615 goto out;
2616
2617 c.data.byid = p->index;
2618 c.event = nlh->nlmsg_type;
2619 c.seq = nlh->nlmsg_seq;
2620 c.portid = nlh->nlmsg_pid;
2621 km_policy_notify(xp, p->dir, &c);
2622 }
2623
2624 out:
2625 xfrm_pol_put(xp);
2626 return err;
2627 }
2628
xfrm_flush_sa(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs,struct netlink_ext_ack * extack)2629 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
2630 struct nlattr **attrs,
2631 struct netlink_ext_ack *extack)
2632 {
2633 struct net *net = sock_net(skb->sk);
2634 struct km_event c;
2635 struct xfrm_usersa_flush *p = nlmsg_data(nlh);
2636 int err;
2637
2638 err = xfrm_state_flush(net, p->proto, true);
2639 if (err) {
2640 if (err == -ESRCH) /* empty table */
2641 return 0;
2642 return err;
2643 }
2644 c.data.proto = p->proto;
2645 c.event = nlh->nlmsg_type;
2646 c.seq = nlh->nlmsg_seq;
2647 c.portid = nlh->nlmsg_pid;
2648 c.net = net;
2649 km_state_notify(NULL, &c);
2650
2651 return 0;
2652 }
2653
xfrm_aevent_msgsize(struct xfrm_state * x)2654 static inline unsigned int xfrm_aevent_msgsize(struct xfrm_state *x)
2655 {
2656 unsigned int replay_size = x->replay_esn ?
2657 xfrm_replay_state_esn_len(x->replay_esn) :
2658 sizeof(struct xfrm_replay_state);
2659
2660 return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id))
2661 + nla_total_size(replay_size)
2662 + nla_total_size_64bit(sizeof(struct xfrm_lifetime_cur))
2663 + nla_total_size(sizeof(struct xfrm_mark))
2664 + nla_total_size(4) /* XFRM_AE_RTHR */
2665 + nla_total_size(4) /* XFRM_AE_ETHR */
2666 + nla_total_size(sizeof(x->dir)) /* XFRMA_SA_DIR */
2667 + nla_total_size(4); /* XFRMA_SA_PCPU */
2668 }
2669
build_aevent(struct sk_buff * skb,struct xfrm_state * x,const struct km_event * c)2670 static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
2671 {
2672 struct xfrm_aevent_id *id;
2673 struct nlmsghdr *nlh;
2674 int err;
2675
2676 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0);
2677 if (nlh == NULL)
2678 return -EMSGSIZE;
2679
2680 id = nlmsg_data(nlh);
2681 memset(&id->sa_id, 0, sizeof(id->sa_id));
2682 memcpy(&id->sa_id.daddr, &x->id.daddr, sizeof(x->id.daddr));
2683 id->sa_id.spi = x->id.spi;
2684 id->sa_id.family = x->props.family;
2685 id->sa_id.proto = x->id.proto;
2686 memcpy(&id->saddr, &x->props.saddr, sizeof(x->props.saddr));
2687 id->reqid = x->props.reqid;
2688 id->flags = c->data.aevent;
2689
2690 if (x->replay_esn) {
2691 err = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
2692 xfrm_replay_state_esn_len(x->replay_esn),
2693 x->replay_esn);
2694 } else {
2695 err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
2696 &x->replay);
2697 }
2698 if (err)
2699 goto out_cancel;
2700 err = nla_put_64bit(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft,
2701 XFRMA_PAD);
2702 if (err)
2703 goto out_cancel;
2704
2705 if (id->flags & XFRM_AE_RTHR) {
2706 err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff);
2707 if (err)
2708 goto out_cancel;
2709 }
2710 if (id->flags & XFRM_AE_ETHR) {
2711 err = nla_put_u32(skb, XFRMA_ETIMER_THRESH,
2712 x->replay_maxage * 10 / HZ);
2713 if (err)
2714 goto out_cancel;
2715 }
2716 err = xfrm_mark_put(skb, &x->mark);
2717 if (err)
2718 goto out_cancel;
2719
2720 err = xfrm_if_id_put(skb, x->if_id);
2721 if (err)
2722 goto out_cancel;
2723 if (x->pcpu_num != UINT_MAX) {
2724 err = nla_put_u32(skb, XFRMA_SA_PCPU, x->pcpu_num);
2725 if (err)
2726 goto out_cancel;
2727 }
2728
2729 if (x->dir) {
2730 err = nla_put_u8(skb, XFRMA_SA_DIR, x->dir);
2731 if (err)
2732 goto out_cancel;
2733 }
2734
2735 nlmsg_end(skb, nlh);
2736 return 0;
2737
2738 out_cancel:
2739 nlmsg_cancel(skb, nlh);
2740 return err;
2741 }
2742
xfrm_get_ae(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs,struct netlink_ext_ack * extack)2743 static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
2744 struct nlattr **attrs, struct netlink_ext_ack *extack)
2745 {
2746 struct net *net = sock_net(skb->sk);
2747 struct xfrm_state *x;
2748 struct sk_buff *r_skb;
2749 int err;
2750 struct km_event c;
2751 u32 mark;
2752 struct xfrm_mark m;
2753 struct xfrm_aevent_id *p = nlmsg_data(nlh);
2754 struct xfrm_usersa_id *id = &p->sa_id;
2755
2756 mark = xfrm_mark_get(attrs, &m);
2757
2758 x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family);
2759 if (x == NULL)
2760 return -ESRCH;
2761
2762 r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
2763 if (r_skb == NULL) {
2764 xfrm_state_put(x);
2765 return -ENOMEM;
2766 }
2767
2768 /*
2769 * XXX: is this lock really needed - none of the other
2770 * gets lock (the concern is things getting updated
2771 * while we are still reading) - jhs
2772 */
2773 spin_lock_bh(&x->lock);
2774 c.data.aevent = p->flags;
2775 c.seq = nlh->nlmsg_seq;
2776 c.portid = nlh->nlmsg_pid;
2777
2778 err = build_aevent(r_skb, x, &c);
2779 BUG_ON(err < 0);
2780
2781 err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).portid);
2782 spin_unlock_bh(&x->lock);
2783 xfrm_state_put(x);
2784 return err;
2785 }
2786
xfrm_new_ae(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs,struct netlink_ext_ack * extack)2787 static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
2788 struct nlattr **attrs, struct netlink_ext_ack *extack)
2789 {
2790 struct net *net = sock_net(skb->sk);
2791 struct xfrm_state *x;
2792 struct km_event c;
2793 int err = -EINVAL;
2794 u32 mark = 0;
2795 struct xfrm_mark m;
2796 struct xfrm_aevent_id *p = nlmsg_data(nlh);
2797 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
2798 struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL];
2799 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
2800 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
2801 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
2802
2803 if (!lt && !rp && !re && !et && !rt) {
2804 NL_SET_ERR_MSG(extack, "Missing required attribute for AE");
2805 return err;
2806 }
2807
2808 /* pedantic mode - thou shalt sayeth replaceth */
2809 if (!(nlh->nlmsg_flags & NLM_F_REPLACE)) {
2810 NL_SET_ERR_MSG(extack, "NLM_F_REPLACE flag is required");
2811 return err;
2812 }
2813
2814 mark = xfrm_mark_get(attrs, &m);
2815
2816 x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
2817 if (x == NULL)
2818 return -ESRCH;
2819
2820 if (x->km.state != XFRM_STATE_VALID) {
2821 NL_SET_ERR_MSG(extack, "SA must be in VALID state");
2822 goto out;
2823 }
2824
2825 err = xfrm_replay_verify_len(x->replay_esn, re, extack);
2826 if (err)
2827 goto out;
2828
2829 spin_lock_bh(&x->lock);
2830 xfrm_update_ae_params(x, attrs, 1);
2831 spin_unlock_bh(&x->lock);
2832
2833 c.event = nlh->nlmsg_type;
2834 c.seq = nlh->nlmsg_seq;
2835 c.portid = nlh->nlmsg_pid;
2836 c.data.aevent = XFRM_AE_CU;
2837 km_state_notify(x, &c);
2838 err = 0;
2839 out:
2840 xfrm_state_put(x);
2841 return err;
2842 }
2843
xfrm_flush_policy(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs,struct netlink_ext_ack * extack)2844 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
2845 struct nlattr **attrs,
2846 struct netlink_ext_ack *extack)
2847 {
2848 struct net *net = sock_net(skb->sk);
2849 struct km_event c;
2850 u8 type = XFRM_POLICY_TYPE_MAIN;
2851 int err;
2852
2853 err = copy_from_user_policy_type(&type, attrs, extack);
2854 if (err)
2855 return err;
2856
2857 err = xfrm_policy_flush(net, type, true);
2858 if (err) {
2859 if (err == -ESRCH) /* empty table */
2860 return 0;
2861 return err;
2862 }
2863
2864 c.data.type = type;
2865 c.event = nlh->nlmsg_type;
2866 c.seq = nlh->nlmsg_seq;
2867 c.portid = nlh->nlmsg_pid;
2868 c.net = net;
2869 km_policy_notify(NULL, 0, &c);
2870 return 0;
2871 }
2872
xfrm_add_pol_expire(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs,struct netlink_ext_ack * extack)2873 static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
2874 struct nlattr **attrs,
2875 struct netlink_ext_ack *extack)
2876 {
2877 struct net *net = sock_net(skb->sk);
2878 struct xfrm_policy *xp;
2879 struct xfrm_user_polexpire *up = nlmsg_data(nlh);
2880 struct xfrm_userpolicy_info *p = &up->pol;
2881 u8 type = XFRM_POLICY_TYPE_MAIN;
2882 int err = -ENOENT;
2883 struct xfrm_mark m;
2884 u32 if_id = 0;
2885
2886 err = copy_from_user_policy_type(&type, attrs, extack);
2887 if (err)
2888 return err;
2889
2890 err = verify_policy_dir(p->dir, extack);
2891 if (err)
2892 return err;
2893
2894 if (attrs[XFRMA_IF_ID])
2895 if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
2896
2897 xfrm_mark_get(attrs, &m);
2898
2899 if (p->index)
2900 xp = xfrm_policy_byid(net, &m, if_id, type, p->dir, p->index,
2901 0, &err);
2902 else {
2903 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
2904 struct xfrm_sec_ctx *ctx;
2905
2906 err = verify_sec_ctx_len(attrs, extack);
2907 if (err)
2908 return err;
2909
2910 ctx = NULL;
2911 if (rt) {
2912 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
2913
2914 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
2915 if (err)
2916 return err;
2917 }
2918 xp = xfrm_policy_bysel_ctx(net, &m, if_id, type, p->dir,
2919 &p->sel, ctx, 0, &err);
2920 security_xfrm_policy_free(ctx);
2921 }
2922 if (xp == NULL)
2923 return -ENOENT;
2924
2925 if (unlikely(xp->walk.dead))
2926 goto out;
2927
2928 err = 0;
2929 if (up->hard) {
2930 xfrm_policy_delete(xp, p->dir);
2931 xfrm_audit_policy_delete(xp, 1, true);
2932 }
2933 km_policy_expired(xp, p->dir, up->hard, nlh->nlmsg_pid);
2934
2935 out:
2936 xfrm_pol_put(xp);
2937 return err;
2938 }
2939
xfrm_add_sa_expire(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs,struct netlink_ext_ack * extack)2940 static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
2941 struct nlattr **attrs,
2942 struct netlink_ext_ack *extack)
2943 {
2944 struct net *net = sock_net(skb->sk);
2945 struct xfrm_state *x;
2946 int err;
2947 struct xfrm_user_expire *ue = nlmsg_data(nlh);
2948 struct xfrm_usersa_info *p = &ue->state;
2949 struct xfrm_mark m;
2950 u32 mark = xfrm_mark_get(attrs, &m);
2951
2952 x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family);
2953
2954 err = -ENOENT;
2955 if (x == NULL)
2956 return err;
2957
2958 spin_lock_bh(&x->lock);
2959 err = -EINVAL;
2960 if (x->km.state != XFRM_STATE_VALID) {
2961 NL_SET_ERR_MSG(extack, "SA must be in VALID state");
2962 goto out;
2963 }
2964
2965 km_state_expired(x, ue->hard, nlh->nlmsg_pid);
2966
2967 if (ue->hard) {
2968 __xfrm_state_delete(x);
2969 xfrm_audit_state_delete(x, 1, true);
2970 }
2971 err = 0;
2972 out:
2973 spin_unlock_bh(&x->lock);
2974 xfrm_state_put(x);
2975 return err;
2976 }
2977
xfrm_add_acquire(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs,struct netlink_ext_ack * extack)2978 static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
2979 struct nlattr **attrs,
2980 struct netlink_ext_ack *extack)
2981 {
2982 struct net *net = sock_net(skb->sk);
2983 struct xfrm_policy *xp;
2984 struct xfrm_user_tmpl *ut;
2985 int i;
2986 struct nlattr *rt = attrs[XFRMA_TMPL];
2987 struct xfrm_mark mark;
2988
2989 struct xfrm_user_acquire *ua = nlmsg_data(nlh);
2990 struct xfrm_state *x = xfrm_state_alloc(net);
2991 int err = -ENOMEM;
2992
2993 if (!x)
2994 goto nomem;
2995
2996 xfrm_mark_get(attrs, &mark);
2997
2998 if (attrs[XFRMA_SA_PCPU]) {
2999 x->pcpu_num = nla_get_u32(attrs[XFRMA_SA_PCPU]);
3000 err = -EINVAL;
3001 if (x->pcpu_num >= num_possible_cpus())
3002 goto free_state;
3003 }
3004
3005 err = verify_newpolicy_info(&ua->policy, extack);
3006 if (err)
3007 goto free_state;
3008 err = verify_sec_ctx_len(attrs, extack);
3009 if (err)
3010 goto free_state;
3011
3012 /* build an XP */
3013 xp = xfrm_policy_construct(net, &ua->policy, attrs, &err, extack);
3014 if (!xp)
3015 goto free_state;
3016
3017 memcpy(&x->id, &ua->id, sizeof(ua->id));
3018 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
3019 memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
3020 xp->mark.m = x->mark.m = mark.m;
3021 xp->mark.v = x->mark.v = mark.v;
3022 ut = nla_data(rt);
3023 /* extract the templates and for each call km_key */
3024 for (i = 0; i < xp->xfrm_nr; i++, ut++) {
3025 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
3026 memcpy(&x->id, &t->id, sizeof(x->id));
3027 x->props.mode = t->mode;
3028 x->props.reqid = t->reqid;
3029 x->props.family = ut->family;
3030 t->aalgos = ua->aalgos;
3031 t->ealgos = ua->ealgos;
3032 t->calgos = ua->calgos;
3033 err = km_query(x, t, xp);
3034
3035 }
3036
3037 xfrm_state_free(x);
3038 kfree(xp);
3039
3040 return 0;
3041
3042 free_state:
3043 xfrm_state_free(x);
3044 nomem:
3045 return err;
3046 }
3047
3048 #ifdef CONFIG_XFRM_MIGRATE
copy_from_user_migrate(struct xfrm_migrate * ma,struct xfrm_kmaddress * k,struct nlattr ** attrs,int * num,struct netlink_ext_ack * extack)3049 static int copy_from_user_migrate(struct xfrm_migrate *ma,
3050 struct xfrm_kmaddress *k,
3051 struct nlattr **attrs, int *num,
3052 struct netlink_ext_ack *extack)
3053 {
3054 struct nlattr *rt = attrs[XFRMA_MIGRATE];
3055 struct xfrm_user_migrate *um;
3056 int i, num_migrate;
3057
3058 if (k != NULL) {
3059 struct xfrm_user_kmaddress *uk;
3060
3061 uk = nla_data(attrs[XFRMA_KMADDRESS]);
3062 memcpy(&k->local, &uk->local, sizeof(k->local));
3063 memcpy(&k->remote, &uk->remote, sizeof(k->remote));
3064 k->family = uk->family;
3065 k->reserved = uk->reserved;
3066 }
3067
3068 um = nla_data(rt);
3069 num_migrate = nla_len(rt) / sizeof(*um);
3070
3071 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH) {
3072 NL_SET_ERR_MSG(extack, "Invalid number of SAs to migrate, must be 0 < num <= XFRM_MAX_DEPTH (6)");
3073 return -EINVAL;
3074 }
3075
3076 for (i = 0; i < num_migrate; i++, um++, ma++) {
3077 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
3078 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
3079 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
3080 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));
3081
3082 ma->proto = um->proto;
3083 ma->mode = um->mode;
3084 ma->reqid = um->reqid;
3085
3086 ma->old_family = um->old_family;
3087 ma->new_family = um->new_family;
3088 }
3089
3090 *num = i;
3091 return 0;
3092 }
3093
xfrm_do_migrate(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs,struct netlink_ext_ack * extack)3094 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
3095 struct nlattr **attrs, struct netlink_ext_ack *extack)
3096 {
3097 struct xfrm_userpolicy_id *pi = nlmsg_data(nlh);
3098 struct xfrm_migrate m[XFRM_MAX_DEPTH];
3099 struct xfrm_kmaddress km, *kmp;
3100 u8 type;
3101 int err;
3102 int n = 0;
3103 struct net *net = sock_net(skb->sk);
3104 struct xfrm_encap_tmpl *encap = NULL;
3105 struct xfrm_user_offload *xuo = NULL;
3106 u32 if_id = 0;
3107
3108 if (!attrs[XFRMA_MIGRATE]) {
3109 NL_SET_ERR_MSG(extack, "Missing required MIGRATE attribute");
3110 return -EINVAL;
3111 }
3112
3113 kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL;
3114
3115 err = copy_from_user_policy_type(&type, attrs, extack);
3116 if (err)
3117 return err;
3118
3119 err = copy_from_user_migrate(m, kmp, attrs, &n, extack);
3120 if (err)
3121 return err;
3122
3123 if (!n)
3124 return 0;
3125
3126 if (attrs[XFRMA_ENCAP]) {
3127 encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
3128 sizeof(*encap), GFP_KERNEL);
3129 if (!encap)
3130 return -ENOMEM;
3131 }
3132
3133 if (attrs[XFRMA_IF_ID])
3134 if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
3135
3136 if (attrs[XFRMA_OFFLOAD_DEV]) {
3137 xuo = kmemdup(nla_data(attrs[XFRMA_OFFLOAD_DEV]),
3138 sizeof(*xuo), GFP_KERNEL);
3139 if (!xuo) {
3140 err = -ENOMEM;
3141 goto error;
3142 }
3143 }
3144 err = xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp, net, encap,
3145 if_id, extack, xuo);
3146 error:
3147 kfree(encap);
3148 kfree(xuo);
3149 return err;
3150 }
3151 #else
xfrm_do_migrate(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs,struct netlink_ext_ack * extack)3152 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
3153 struct nlattr **attrs, struct netlink_ext_ack *extack)
3154 {
3155 return -ENOPROTOOPT;
3156 }
3157 #endif
3158
3159 #ifdef CONFIG_XFRM_MIGRATE
copy_to_user_migrate(const struct xfrm_migrate * m,struct sk_buff * skb)3160 static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb)
3161 {
3162 struct xfrm_user_migrate um;
3163
3164 memset(&um, 0, sizeof(um));
3165 um.proto = m->proto;
3166 um.mode = m->mode;
3167 um.reqid = m->reqid;
3168 um.old_family = m->old_family;
3169 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
3170 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
3171 um.new_family = m->new_family;
3172 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
3173 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));
3174
3175 return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um);
3176 }
3177
copy_to_user_kmaddress(const struct xfrm_kmaddress * k,struct sk_buff * skb)3178 static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb)
3179 {
3180 struct xfrm_user_kmaddress uk;
3181
3182 memset(&uk, 0, sizeof(uk));
3183 uk.family = k->family;
3184 uk.reserved = k->reserved;
3185 memcpy(&uk.local, &k->local, sizeof(uk.local));
3186 memcpy(&uk.remote, &k->remote, sizeof(uk.remote));
3187
3188 return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk);
3189 }
3190
xfrm_migrate_msgsize(int num_migrate,int with_kma,int with_encp)3191 static inline unsigned int xfrm_migrate_msgsize(int num_migrate, int with_kma,
3192 int with_encp)
3193 {
3194 return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id))
3195 + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0)
3196 + (with_encp ? nla_total_size(sizeof(struct xfrm_encap_tmpl)) : 0)
3197 + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate)
3198 + userpolicy_type_attrsize();
3199 }
3200
build_migrate(struct sk_buff * skb,const struct xfrm_migrate * m,int num_migrate,const struct xfrm_kmaddress * k,const struct xfrm_selector * sel,const struct xfrm_encap_tmpl * encap,u8 dir,u8 type)3201 static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m,
3202 int num_migrate, const struct xfrm_kmaddress *k,
3203 const struct xfrm_selector *sel,
3204 const struct xfrm_encap_tmpl *encap, u8 dir, u8 type)
3205 {
3206 const struct xfrm_migrate *mp;
3207 struct xfrm_userpolicy_id *pol_id;
3208 struct nlmsghdr *nlh;
3209 int i, err;
3210
3211 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0);
3212 if (nlh == NULL)
3213 return -EMSGSIZE;
3214
3215 pol_id = nlmsg_data(nlh);
3216 /* copy data from selector, dir, and type to the pol_id */
3217 memset(pol_id, 0, sizeof(*pol_id));
3218 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
3219 pol_id->dir = dir;
3220
3221 if (k != NULL) {
3222 err = copy_to_user_kmaddress(k, skb);
3223 if (err)
3224 goto out_cancel;
3225 }
3226 if (encap) {
3227 err = nla_put(skb, XFRMA_ENCAP, sizeof(*encap), encap);
3228 if (err)
3229 goto out_cancel;
3230 }
3231 err = copy_to_user_policy_type(type, skb);
3232 if (err)
3233 goto out_cancel;
3234 for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
3235 err = copy_to_user_migrate(mp, skb);
3236 if (err)
3237 goto out_cancel;
3238 }
3239
3240 nlmsg_end(skb, nlh);
3241 return 0;
3242
3243 out_cancel:
3244 nlmsg_cancel(skb, nlh);
3245 return err;
3246 }
3247
xfrm_send_migrate(const struct xfrm_selector * sel,u8 dir,u8 type,const struct xfrm_migrate * m,int num_migrate,const struct xfrm_kmaddress * k,const struct xfrm_encap_tmpl * encap)3248 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3249 const struct xfrm_migrate *m, int num_migrate,
3250 const struct xfrm_kmaddress *k,
3251 const struct xfrm_encap_tmpl *encap)
3252 {
3253 struct net *net = &init_net;
3254 struct sk_buff *skb;
3255 int err;
3256
3257 skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k, !!encap),
3258 GFP_ATOMIC);
3259 if (skb == NULL)
3260 return -ENOMEM;
3261
3262 /* build migrate */
3263 err = build_migrate(skb, m, num_migrate, k, sel, encap, dir, type);
3264 BUG_ON(err < 0);
3265
3266 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MIGRATE);
3267 }
3268 #else
xfrm_send_migrate(const struct xfrm_selector * sel,u8 dir,u8 type,const struct xfrm_migrate * m,int num_migrate,const struct xfrm_kmaddress * k,const struct xfrm_encap_tmpl * encap)3269 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3270 const struct xfrm_migrate *m, int num_migrate,
3271 const struct xfrm_kmaddress *k,
3272 const struct xfrm_encap_tmpl *encap)
3273 {
3274 return -ENOPROTOOPT;
3275 }
3276 #endif
3277
3278 #define XMSGSIZE(type) sizeof(struct type)
3279
3280 const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
3281 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
3282 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
3283 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
3284 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
3285 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
3286 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
3287 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
3288 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
3289 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
3290 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
3291 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
3292 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
3293 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
3294 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0,
3295 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
3296 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
3297 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
3298 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
3299 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32),
3300 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
3301 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
3302 [XFRM_MSG_SETDEFAULT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_default),
3303 [XFRM_MSG_GETDEFAULT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_default),
3304 };
3305 EXPORT_SYMBOL_GPL(xfrm_msg_min);
3306
3307 #undef XMSGSIZE
3308
3309 const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
3310 [XFRMA_UNSPEC] = { .strict_start_type = XFRMA_SA_DIR },
3311 [XFRMA_SA] = { .len = sizeof(struct xfrm_usersa_info)},
3312 [XFRMA_POLICY] = { .len = sizeof(struct xfrm_userpolicy_info)},
3313 [XFRMA_LASTUSED] = { .type = NLA_U64},
3314 [XFRMA_ALG_AUTH_TRUNC] = { .len = sizeof(struct xfrm_algo_auth)},
3315 [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) },
3316 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) },
3317 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) },
3318 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) },
3319 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) },
3320 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) },
3321 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_user_sec_ctx) },
3322 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) },
3323 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) },
3324 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 },
3325 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 },
3326 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) },
3327 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) },
3328 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)},
3329 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) },
3330 [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) },
3331 [XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) },
3332 [XFRMA_TFCPAD] = { .type = NLA_U32 },
3333 [XFRMA_REPLAY_ESN_VAL] = { .len = sizeof(struct xfrm_replay_state_esn) },
3334 [XFRMA_SA_EXTRA_FLAGS] = { .type = NLA_U32 },
3335 [XFRMA_PROTO] = { .type = NLA_U8 },
3336 [XFRMA_ADDRESS_FILTER] = { .len = sizeof(struct xfrm_address_filter) },
3337 [XFRMA_OFFLOAD_DEV] = { .len = sizeof(struct xfrm_user_offload) },
3338 [XFRMA_SET_MARK] = { .type = NLA_U32 },
3339 [XFRMA_SET_MARK_MASK] = { .type = NLA_U32 },
3340 [XFRMA_IF_ID] = { .type = NLA_U32 },
3341 [XFRMA_MTIMER_THRESH] = { .type = NLA_U32 },
3342 [XFRMA_SA_DIR] = NLA_POLICY_RANGE(NLA_U8, XFRM_SA_DIR_IN, XFRM_SA_DIR_OUT),
3343 [XFRMA_NAT_KEEPALIVE_INTERVAL] = { .type = NLA_U32 },
3344 [XFRMA_SA_PCPU] = { .type = NLA_U32 },
3345 [XFRMA_IPTFS_DROP_TIME] = { .type = NLA_U32 },
3346 [XFRMA_IPTFS_REORDER_WINDOW] = { .type = NLA_U16 },
3347 [XFRMA_IPTFS_DONT_FRAG] = { .type = NLA_FLAG },
3348 [XFRMA_IPTFS_INIT_DELAY] = { .type = NLA_U32 },
3349 [XFRMA_IPTFS_MAX_QSIZE] = { .type = NLA_U32 },
3350 [XFRMA_IPTFS_PKT_SIZE] = { .type = NLA_U32 },
3351 };
3352 EXPORT_SYMBOL_GPL(xfrma_policy);
3353
3354 static const struct nla_policy xfrma_spd_policy[XFRMA_SPD_MAX+1] = {
3355 [XFRMA_SPD_IPV4_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
3356 [XFRMA_SPD_IPV6_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
3357 };
3358
3359 static const struct xfrm_link {
3360 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **,
3361 struct netlink_ext_ack *);
3362 int (*start)(struct netlink_callback *);
3363 int (*dump)(struct sk_buff *, struct netlink_callback *);
3364 int (*done)(struct netlink_callback *);
3365 const struct nla_policy *nla_pol;
3366 int nla_max;
3367 } xfrm_dispatch[XFRM_NR_MSGTYPES] = {
3368 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
3369 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa },
3370 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
3371 .dump = xfrm_dump_sa,
3372 .done = xfrm_dump_sa_done },
3373 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
3374 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy },
3375 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
3376 .start = xfrm_dump_policy_start,
3377 .dump = xfrm_dump_policy,
3378 .done = xfrm_dump_policy_done },
3379 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
3380 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire },
3381 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
3382 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
3383 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
3384 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
3385 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa },
3386 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy },
3387 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae },
3388 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae },
3389 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate },
3390 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo },
3391 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_set_spdinfo,
3392 .nla_pol = xfrma_spd_policy,
3393 .nla_max = XFRMA_SPD_MAX },
3394 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo },
3395 [XFRM_MSG_SETDEFAULT - XFRM_MSG_BASE] = { .doit = xfrm_set_default },
3396 [XFRM_MSG_GETDEFAULT - XFRM_MSG_BASE] = { .doit = xfrm_get_default },
3397 };
3398
xfrm_reject_unused_attr(int type,struct nlattr ** attrs,struct netlink_ext_ack * extack)3399 static int xfrm_reject_unused_attr(int type, struct nlattr **attrs,
3400 struct netlink_ext_ack *extack)
3401 {
3402 if (attrs[XFRMA_SA_DIR]) {
3403 switch (type) {
3404 case XFRM_MSG_NEWSA:
3405 case XFRM_MSG_UPDSA:
3406 case XFRM_MSG_ALLOCSPI:
3407 break;
3408 default:
3409 NL_SET_ERR_MSG(extack, "Invalid attribute SA_DIR");
3410 return -EINVAL;
3411 }
3412 }
3413
3414 if (attrs[XFRMA_SA_PCPU]) {
3415 switch (type) {
3416 case XFRM_MSG_NEWSA:
3417 case XFRM_MSG_UPDSA:
3418 case XFRM_MSG_ALLOCSPI:
3419 case XFRM_MSG_ACQUIRE:
3420
3421 break;
3422 default:
3423 NL_SET_ERR_MSG(extack, "Invalid attribute SA_PCPU");
3424 return -EINVAL;
3425 }
3426 }
3427
3428 return 0;
3429 }
3430
xfrm_user_rcv_msg(struct sk_buff * skb,struct nlmsghdr * nlh,struct netlink_ext_ack * extack)3431 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
3432 struct netlink_ext_ack *extack)
3433 {
3434 struct net *net = sock_net(skb->sk);
3435 struct nlattr *attrs[XFRMA_MAX+1];
3436 const struct xfrm_link *link;
3437 struct nlmsghdr *nlh64 = NULL;
3438 int type, err;
3439
3440 type = nlh->nlmsg_type;
3441 if (type > XFRM_MSG_MAX)
3442 return -EINVAL;
3443
3444 type -= XFRM_MSG_BASE;
3445 link = &xfrm_dispatch[type];
3446
3447 /* All operations require privileges, even GET */
3448 if (!netlink_net_capable(skb, CAP_NET_ADMIN))
3449 return -EPERM;
3450
3451 if (in_compat_syscall()) {
3452 struct xfrm_translator *xtr = xfrm_get_translator();
3453
3454 if (!xtr)
3455 return -EOPNOTSUPP;
3456
3457 nlh64 = xtr->rcv_msg_compat(nlh, link->nla_max,
3458 link->nla_pol, extack);
3459 xfrm_put_translator(xtr);
3460 if (IS_ERR(nlh64))
3461 return PTR_ERR(nlh64);
3462 if (nlh64)
3463 nlh = nlh64;
3464 }
3465
3466 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
3467 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
3468 (nlh->nlmsg_flags & NLM_F_DUMP)) {
3469 struct netlink_dump_control c = {
3470 .start = link->start,
3471 .dump = link->dump,
3472 .done = link->done,
3473 };
3474
3475 if (link->dump == NULL) {
3476 err = -EINVAL;
3477 goto err;
3478 }
3479
3480 err = netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c);
3481 goto err;
3482 }
3483
3484 err = nlmsg_parse_deprecated(nlh, xfrm_msg_min[type], attrs,
3485 link->nla_max ? : XFRMA_MAX,
3486 link->nla_pol ? : xfrma_policy, extack);
3487 if (err < 0)
3488 goto err;
3489
3490 if (!link->nla_pol || link->nla_pol == xfrma_policy) {
3491 err = xfrm_reject_unused_attr((type + XFRM_MSG_BASE), attrs, extack);
3492 if (err < 0)
3493 goto err;
3494 }
3495
3496 if (link->doit == NULL) {
3497 err = -EINVAL;
3498 goto err;
3499 }
3500
3501 err = link->doit(skb, nlh, attrs, extack);
3502
3503 /* We need to free skb allocated in xfrm_alloc_compat() before
3504 * returning from this function, because consume_skb() won't take
3505 * care of frag_list since netlink destructor sets
3506 * sbk->head to NULL. (see netlink_skb_destructor())
3507 */
3508 if (skb_has_frag_list(skb)) {
3509 kfree_skb(skb_shinfo(skb)->frag_list);
3510 skb_shinfo(skb)->frag_list = NULL;
3511 }
3512
3513 err:
3514 kvfree(nlh64);
3515 return err;
3516 }
3517
xfrm_netlink_rcv(struct sk_buff * skb)3518 static void xfrm_netlink_rcv(struct sk_buff *skb)
3519 {
3520 struct net *net = sock_net(skb->sk);
3521
3522 mutex_lock(&net->xfrm.xfrm_cfg_mutex);
3523 netlink_rcv_skb(skb, &xfrm_user_rcv_msg);
3524 mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
3525 }
3526
xfrm_expire_msgsize(void)3527 static inline unsigned int xfrm_expire_msgsize(void)
3528 {
3529 return NLMSG_ALIGN(sizeof(struct xfrm_user_expire)) +
3530 nla_total_size(sizeof(struct xfrm_mark)) +
3531 nla_total_size(sizeof_field(struct xfrm_state, dir)) +
3532 nla_total_size(4); /* XFRMA_SA_PCPU */
3533 }
3534
build_expire(struct sk_buff * skb,struct xfrm_state * x,const struct km_event * c)3535 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
3536 {
3537 struct xfrm_user_expire *ue;
3538 struct nlmsghdr *nlh;
3539 int err;
3540
3541 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0);
3542 if (nlh == NULL)
3543 return -EMSGSIZE;
3544
3545 ue = nlmsg_data(nlh);
3546 copy_to_user_state(x, &ue->state);
3547 ue->hard = (c->data.hard != 0) ? 1 : 0;
3548 /* clear the padding bytes */
3549 memset_after(ue, 0, hard);
3550
3551 err = xfrm_mark_put(skb, &x->mark);
3552 if (err)
3553 return err;
3554
3555 err = xfrm_if_id_put(skb, x->if_id);
3556 if (err)
3557 return err;
3558 if (x->pcpu_num != UINT_MAX) {
3559 err = nla_put_u32(skb, XFRMA_SA_PCPU, x->pcpu_num);
3560 if (err)
3561 return err;
3562 }
3563
3564 if (x->dir) {
3565 err = nla_put_u8(skb, XFRMA_SA_DIR, x->dir);
3566 if (err)
3567 return err;
3568 }
3569
3570 nlmsg_end(skb, nlh);
3571 return 0;
3572 }
3573
xfrm_exp_state_notify(struct xfrm_state * x,const struct km_event * c)3574 static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c)
3575 {
3576 struct net *net = xs_net(x);
3577 struct sk_buff *skb;
3578
3579 skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC);
3580 if (skb == NULL)
3581 return -ENOMEM;
3582
3583 if (build_expire(skb, x, c) < 0) {
3584 kfree_skb(skb);
3585 return -EMSGSIZE;
3586 }
3587
3588 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
3589 }
3590
xfrm_aevent_state_notify(struct xfrm_state * x,const struct km_event * c)3591 static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c)
3592 {
3593 struct net *net = xs_net(x);
3594 struct sk_buff *skb;
3595 int err;
3596
3597 skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
3598 if (skb == NULL)
3599 return -ENOMEM;
3600
3601 err = build_aevent(skb, x, c);
3602 BUG_ON(err < 0);
3603
3604 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_AEVENTS);
3605 }
3606
xfrm_notify_sa_flush(const struct km_event * c)3607 static int xfrm_notify_sa_flush(const struct km_event *c)
3608 {
3609 struct net *net = c->net;
3610 struct xfrm_usersa_flush *p;
3611 struct nlmsghdr *nlh;
3612 struct sk_buff *skb;
3613 int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush));
3614
3615 skb = nlmsg_new(len, GFP_ATOMIC);
3616 if (skb == NULL)
3617 return -ENOMEM;
3618
3619 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0);
3620 if (nlh == NULL) {
3621 kfree_skb(skb);
3622 return -EMSGSIZE;
3623 }
3624
3625 p = nlmsg_data(nlh);
3626 p->proto = c->data.proto;
3627
3628 nlmsg_end(skb, nlh);
3629
3630 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
3631 }
3632
xfrm_sa_len(struct xfrm_state * x)3633 static inline unsigned int xfrm_sa_len(struct xfrm_state *x)
3634 {
3635 unsigned int l = 0;
3636 if (x->aead)
3637 l += nla_total_size(aead_len(x->aead));
3638 if (x->aalg) {
3639 l += nla_total_size(sizeof(struct xfrm_algo) +
3640 (x->aalg->alg_key_len + 7) / 8);
3641 l += nla_total_size(xfrm_alg_auth_len(x->aalg));
3642 }
3643 if (x->ealg)
3644 l += nla_total_size(xfrm_alg_len(x->ealg));
3645 if (x->calg)
3646 l += nla_total_size(sizeof(*x->calg));
3647 if (x->encap)
3648 l += nla_total_size(sizeof(*x->encap));
3649 if (x->tfcpad)
3650 l += nla_total_size(sizeof(x->tfcpad));
3651 if (x->replay_esn)
3652 l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn));
3653 else
3654 l += nla_total_size(sizeof(struct xfrm_replay_state));
3655 if (x->security)
3656 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) +
3657 x->security->ctx_len);
3658 if (x->coaddr)
3659 l += nla_total_size(sizeof(*x->coaddr));
3660 if (x->props.extra_flags)
3661 l += nla_total_size(sizeof(x->props.extra_flags));
3662 if (x->xso.dev)
3663 l += nla_total_size(sizeof(struct xfrm_user_offload));
3664 if (x->props.smark.v | x->props.smark.m) {
3665 l += nla_total_size(sizeof(x->props.smark.v));
3666 l += nla_total_size(sizeof(x->props.smark.m));
3667 }
3668 if (x->if_id)
3669 l += nla_total_size(sizeof(x->if_id));
3670 if (x->pcpu_num)
3671 l += nla_total_size(sizeof(x->pcpu_num));
3672
3673 /* Must count x->lastused as it may become non-zero behind our back. */
3674 l += nla_total_size_64bit(sizeof(u64));
3675
3676 if (x->mapping_maxage)
3677 l += nla_total_size(sizeof(x->mapping_maxage));
3678
3679 if (x->dir)
3680 l += nla_total_size(sizeof(x->dir));
3681
3682 if (x->nat_keepalive_interval)
3683 l += nla_total_size(sizeof(x->nat_keepalive_interval));
3684
3685 if (x->mode_cbs && x->mode_cbs->sa_len)
3686 l += x->mode_cbs->sa_len(x);
3687
3688 return l;
3689 }
3690
xfrm_notify_sa(struct xfrm_state * x,const struct km_event * c)3691 static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c)
3692 {
3693 struct net *net = xs_net(x);
3694 struct xfrm_usersa_info *p;
3695 struct xfrm_usersa_id *id;
3696 struct nlmsghdr *nlh;
3697 struct sk_buff *skb;
3698 unsigned int len = xfrm_sa_len(x);
3699 unsigned int headlen;
3700 int err;
3701
3702 headlen = sizeof(*p);
3703 if (c->event == XFRM_MSG_DELSA) {
3704 len += nla_total_size(headlen);
3705 headlen = sizeof(*id);
3706 len += nla_total_size(sizeof(struct xfrm_mark));
3707 }
3708 len += NLMSG_ALIGN(headlen);
3709
3710 skb = nlmsg_new(len, GFP_ATOMIC);
3711 if (skb == NULL)
3712 return -ENOMEM;
3713
3714 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
3715 err = -EMSGSIZE;
3716 if (nlh == NULL)
3717 goto out_free_skb;
3718
3719 p = nlmsg_data(nlh);
3720 if (c->event == XFRM_MSG_DELSA) {
3721 struct nlattr *attr;
3722
3723 id = nlmsg_data(nlh);
3724 memset(id, 0, sizeof(*id));
3725 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
3726 id->spi = x->id.spi;
3727 id->family = x->props.family;
3728 id->proto = x->id.proto;
3729
3730 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p));
3731 err = -EMSGSIZE;
3732 if (attr == NULL)
3733 goto out_free_skb;
3734
3735 p = nla_data(attr);
3736 }
3737 err = copy_to_user_state_extra(x, p, skb);
3738 if (err)
3739 goto out_free_skb;
3740
3741 nlmsg_end(skb, nlh);
3742
3743 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
3744
3745 out_free_skb:
3746 kfree_skb(skb);
3747 return err;
3748 }
3749
xfrm_send_state_notify(struct xfrm_state * x,const struct km_event * c)3750 static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c)
3751 {
3752
3753 switch (c->event) {
3754 case XFRM_MSG_EXPIRE:
3755 return xfrm_exp_state_notify(x, c);
3756 case XFRM_MSG_NEWAE:
3757 return xfrm_aevent_state_notify(x, c);
3758 case XFRM_MSG_DELSA:
3759 case XFRM_MSG_UPDSA:
3760 case XFRM_MSG_NEWSA:
3761 return xfrm_notify_sa(x, c);
3762 case XFRM_MSG_FLUSHSA:
3763 return xfrm_notify_sa_flush(c);
3764 default:
3765 printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n",
3766 c->event);
3767 break;
3768 }
3769
3770 return 0;
3771
3772 }
3773
xfrm_acquire_msgsize(struct xfrm_state * x,struct xfrm_policy * xp)3774 static inline unsigned int xfrm_acquire_msgsize(struct xfrm_state *x,
3775 struct xfrm_policy *xp)
3776 {
3777 return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire))
3778 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
3779 + nla_total_size(sizeof(struct xfrm_mark))
3780 + nla_total_size(xfrm_user_sec_ctx_size(x->security))
3781 + nla_total_size(4) /* XFRMA_SA_PCPU */
3782 + userpolicy_type_attrsize();
3783 }
3784
build_acquire(struct sk_buff * skb,struct xfrm_state * x,struct xfrm_tmpl * xt,struct xfrm_policy * xp)3785 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
3786 struct xfrm_tmpl *xt, struct xfrm_policy *xp)
3787 {
3788 __u32 seq = xfrm_get_acqseq();
3789 struct xfrm_user_acquire *ua;
3790 struct nlmsghdr *nlh;
3791 int err;
3792
3793 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0);
3794 if (nlh == NULL)
3795 return -EMSGSIZE;
3796
3797 ua = nlmsg_data(nlh);
3798 memcpy(&ua->id, &x->id, sizeof(ua->id));
3799 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
3800 memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
3801 copy_to_user_policy(xp, &ua->policy, XFRM_POLICY_OUT);
3802 ua->aalgos = xt->aalgos;
3803 ua->ealgos = xt->ealgos;
3804 ua->calgos = xt->calgos;
3805 ua->seq = x->km.seq = seq;
3806
3807 err = copy_to_user_tmpl(xp, skb);
3808 if (!err)
3809 err = copy_to_user_state_sec_ctx(x, skb);
3810 if (!err)
3811 err = copy_to_user_policy_type(xp->type, skb);
3812 if (!err)
3813 err = xfrm_mark_put(skb, &xp->mark);
3814 if (!err)
3815 err = xfrm_if_id_put(skb, xp->if_id);
3816 if (!err && xp->xdo.dev)
3817 err = copy_user_offload(&xp->xdo, skb);
3818 if (!err && x->pcpu_num != UINT_MAX)
3819 err = nla_put_u32(skb, XFRMA_SA_PCPU, x->pcpu_num);
3820 if (err) {
3821 nlmsg_cancel(skb, nlh);
3822 return err;
3823 }
3824
3825 nlmsg_end(skb, nlh);
3826 return 0;
3827 }
3828
xfrm_send_acquire(struct xfrm_state * x,struct xfrm_tmpl * xt,struct xfrm_policy * xp)3829 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
3830 struct xfrm_policy *xp)
3831 {
3832 struct net *net = xs_net(x);
3833 struct sk_buff *skb;
3834 int err;
3835
3836 skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC);
3837 if (skb == NULL)
3838 return -ENOMEM;
3839
3840 err = build_acquire(skb, x, xt, xp);
3841 BUG_ON(err < 0);
3842
3843 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_ACQUIRE);
3844 }
3845
3846 /* User gives us xfrm_user_policy_info followed by an array of 0
3847 * or more templates.
3848 */
xfrm_compile_policy(struct sock * sk,int opt,u8 * data,int len,int * dir)3849 static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
3850 u8 *data, int len, int *dir)
3851 {
3852 struct net *net = sock_net(sk);
3853 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
3854 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
3855 struct xfrm_policy *xp;
3856 int nr;
3857
3858 switch (sk->sk_family) {
3859 case AF_INET:
3860 if (opt != IP_XFRM_POLICY) {
3861 *dir = -EOPNOTSUPP;
3862 return NULL;
3863 }
3864 break;
3865 #if IS_ENABLED(CONFIG_IPV6)
3866 case AF_INET6:
3867 if (opt != IPV6_XFRM_POLICY) {
3868 *dir = -EOPNOTSUPP;
3869 return NULL;
3870 }
3871 break;
3872 #endif
3873 default:
3874 *dir = -EINVAL;
3875 return NULL;
3876 }
3877
3878 *dir = -EINVAL;
3879
3880 if (len < sizeof(*p) ||
3881 verify_newpolicy_info(p, NULL))
3882 return NULL;
3883
3884 nr = ((len - sizeof(*p)) / sizeof(*ut));
3885 if (validate_tmpl(nr, ut, p->sel.family, p->dir, NULL))
3886 return NULL;
3887
3888 if (p->dir > XFRM_POLICY_OUT)
3889 return NULL;
3890
3891 xp = xfrm_policy_alloc(net, GFP_ATOMIC);
3892 if (xp == NULL) {
3893 *dir = -ENOBUFS;
3894 return NULL;
3895 }
3896
3897 copy_from_user_policy(xp, p);
3898 xp->type = XFRM_POLICY_TYPE_MAIN;
3899 copy_templates(xp, ut, nr);
3900
3901 *dir = p->dir;
3902
3903 return xp;
3904 }
3905
xfrm_polexpire_msgsize(struct xfrm_policy * xp)3906 static inline unsigned int xfrm_polexpire_msgsize(struct xfrm_policy *xp)
3907 {
3908 return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire))
3909 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
3910 + nla_total_size(xfrm_user_sec_ctx_size(xp->security))
3911 + nla_total_size(sizeof(struct xfrm_mark))
3912 + userpolicy_type_attrsize();
3913 }
3914
build_polexpire(struct sk_buff * skb,struct xfrm_policy * xp,int dir,const struct km_event * c)3915 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
3916 int dir, const struct km_event *c)
3917 {
3918 struct xfrm_user_polexpire *upe;
3919 int hard = c->data.hard;
3920 struct nlmsghdr *nlh;
3921 int err;
3922
3923 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0);
3924 if (nlh == NULL)
3925 return -EMSGSIZE;
3926
3927 upe = nlmsg_data(nlh);
3928 copy_to_user_policy(xp, &upe->pol, dir);
3929 err = copy_to_user_tmpl(xp, skb);
3930 if (!err)
3931 err = copy_to_user_sec_ctx(xp, skb);
3932 if (!err)
3933 err = copy_to_user_policy_type(xp->type, skb);
3934 if (!err)
3935 err = xfrm_mark_put(skb, &xp->mark);
3936 if (!err)
3937 err = xfrm_if_id_put(skb, xp->if_id);
3938 if (!err && xp->xdo.dev)
3939 err = copy_user_offload(&xp->xdo, skb);
3940 if (err) {
3941 nlmsg_cancel(skb, nlh);
3942 return err;
3943 }
3944 upe->hard = !!hard;
3945
3946 nlmsg_end(skb, nlh);
3947 return 0;
3948 }
3949
xfrm_exp_policy_notify(struct xfrm_policy * xp,int dir,const struct km_event * c)3950 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3951 {
3952 struct net *net = xp_net(xp);
3953 struct sk_buff *skb;
3954 int err;
3955
3956 skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC);
3957 if (skb == NULL)
3958 return -ENOMEM;
3959
3960 err = build_polexpire(skb, xp, dir, c);
3961 BUG_ON(err < 0);
3962
3963 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
3964 }
3965
xfrm_notify_policy(struct xfrm_policy * xp,int dir,const struct km_event * c)3966 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
3967 {
3968 unsigned int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
3969 struct net *net = xp_net(xp);
3970 struct xfrm_userpolicy_info *p;
3971 struct xfrm_userpolicy_id *id;
3972 struct nlmsghdr *nlh;
3973 struct sk_buff *skb;
3974 unsigned int headlen;
3975 int err;
3976
3977 headlen = sizeof(*p);
3978 if (c->event == XFRM_MSG_DELPOLICY) {
3979 len += nla_total_size(headlen);
3980 headlen = sizeof(*id);
3981 }
3982 len += userpolicy_type_attrsize();
3983 len += nla_total_size(sizeof(struct xfrm_mark));
3984 len += NLMSG_ALIGN(headlen);
3985
3986 skb = nlmsg_new(len, GFP_ATOMIC);
3987 if (skb == NULL)
3988 return -ENOMEM;
3989
3990 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
3991 err = -EMSGSIZE;
3992 if (nlh == NULL)
3993 goto out_free_skb;
3994
3995 p = nlmsg_data(nlh);
3996 if (c->event == XFRM_MSG_DELPOLICY) {
3997 struct nlattr *attr;
3998
3999 id = nlmsg_data(nlh);
4000 memset(id, 0, sizeof(*id));
4001 id->dir = dir;
4002 if (c->data.byid)
4003 id->index = xp->index;
4004 else
4005 memcpy(&id->sel, &xp->selector, sizeof(id->sel));
4006
4007 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p));
4008 err = -EMSGSIZE;
4009 if (attr == NULL)
4010 goto out_free_skb;
4011
4012 p = nla_data(attr);
4013 }
4014
4015 copy_to_user_policy(xp, p, dir);
4016 err = copy_to_user_tmpl(xp, skb);
4017 if (!err)
4018 err = copy_to_user_policy_type(xp->type, skb);
4019 if (!err)
4020 err = xfrm_mark_put(skb, &xp->mark);
4021 if (!err)
4022 err = xfrm_if_id_put(skb, xp->if_id);
4023 if (!err && xp->xdo.dev)
4024 err = copy_user_offload(&xp->xdo, skb);
4025 if (err)
4026 goto out_free_skb;
4027
4028 nlmsg_end(skb, nlh);
4029
4030 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
4031
4032 out_free_skb:
4033 kfree_skb(skb);
4034 return err;
4035 }
4036
xfrm_notify_policy_flush(const struct km_event * c)4037 static int xfrm_notify_policy_flush(const struct km_event *c)
4038 {
4039 struct net *net = c->net;
4040 struct nlmsghdr *nlh;
4041 struct sk_buff *skb;
4042 int err;
4043
4044 skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC);
4045 if (skb == NULL)
4046 return -ENOMEM;
4047
4048 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0);
4049 err = -EMSGSIZE;
4050 if (nlh == NULL)
4051 goto out_free_skb;
4052 err = copy_to_user_policy_type(c->data.type, skb);
4053 if (err)
4054 goto out_free_skb;
4055
4056 nlmsg_end(skb, nlh);
4057
4058 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
4059
4060 out_free_skb:
4061 kfree_skb(skb);
4062 return err;
4063 }
4064
xfrm_send_policy_notify(struct xfrm_policy * xp,int dir,const struct km_event * c)4065 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
4066 {
4067
4068 switch (c->event) {
4069 case XFRM_MSG_NEWPOLICY:
4070 case XFRM_MSG_UPDPOLICY:
4071 case XFRM_MSG_DELPOLICY:
4072 return xfrm_notify_policy(xp, dir, c);
4073 case XFRM_MSG_FLUSHPOLICY:
4074 return xfrm_notify_policy_flush(c);
4075 case XFRM_MSG_POLEXPIRE:
4076 return xfrm_exp_policy_notify(xp, dir, c);
4077 default:
4078 printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n",
4079 c->event);
4080 }
4081
4082 return 0;
4083
4084 }
4085
xfrm_report_msgsize(void)4086 static inline unsigned int xfrm_report_msgsize(void)
4087 {
4088 return NLMSG_ALIGN(sizeof(struct xfrm_user_report));
4089 }
4090
build_report(struct sk_buff * skb,u8 proto,struct xfrm_selector * sel,xfrm_address_t * addr)4091 static int build_report(struct sk_buff *skb, u8 proto,
4092 struct xfrm_selector *sel, xfrm_address_t *addr)
4093 {
4094 struct xfrm_user_report *ur;
4095 struct nlmsghdr *nlh;
4096
4097 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0);
4098 if (nlh == NULL)
4099 return -EMSGSIZE;
4100
4101 ur = nlmsg_data(nlh);
4102 ur->proto = proto;
4103 memcpy(&ur->sel, sel, sizeof(ur->sel));
4104
4105 if (addr) {
4106 int err = nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr);
4107 if (err) {
4108 nlmsg_cancel(skb, nlh);
4109 return err;
4110 }
4111 }
4112 nlmsg_end(skb, nlh);
4113 return 0;
4114 }
4115
xfrm_send_report(struct net * net,u8 proto,struct xfrm_selector * sel,xfrm_address_t * addr)4116 static int xfrm_send_report(struct net *net, u8 proto,
4117 struct xfrm_selector *sel, xfrm_address_t *addr)
4118 {
4119 struct sk_buff *skb;
4120 int err;
4121
4122 skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC);
4123 if (skb == NULL)
4124 return -ENOMEM;
4125
4126 err = build_report(skb, proto, sel, addr);
4127 BUG_ON(err < 0);
4128
4129 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_REPORT);
4130 }
4131
xfrm_mapping_msgsize(void)4132 static inline unsigned int xfrm_mapping_msgsize(void)
4133 {
4134 return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping));
4135 }
4136
build_mapping(struct sk_buff * skb,struct xfrm_state * x,xfrm_address_t * new_saddr,__be16 new_sport)4137 static int build_mapping(struct sk_buff *skb, struct xfrm_state *x,
4138 xfrm_address_t *new_saddr, __be16 new_sport)
4139 {
4140 struct xfrm_user_mapping *um;
4141 struct nlmsghdr *nlh;
4142
4143 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0);
4144 if (nlh == NULL)
4145 return -EMSGSIZE;
4146
4147 um = nlmsg_data(nlh);
4148
4149 memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr));
4150 um->id.spi = x->id.spi;
4151 um->id.family = x->props.family;
4152 um->id.proto = x->id.proto;
4153 memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr));
4154 memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr));
4155 um->new_sport = new_sport;
4156 um->old_sport = x->encap->encap_sport;
4157 um->reqid = x->props.reqid;
4158
4159 nlmsg_end(skb, nlh);
4160 return 0;
4161 }
4162
xfrm_send_mapping(struct xfrm_state * x,xfrm_address_t * ipaddr,__be16 sport)4163 static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr,
4164 __be16 sport)
4165 {
4166 struct net *net = xs_net(x);
4167 struct sk_buff *skb;
4168 int err;
4169
4170 if (x->id.proto != IPPROTO_ESP)
4171 return -EINVAL;
4172
4173 if (!x->encap)
4174 return -EINVAL;
4175
4176 skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC);
4177 if (skb == NULL)
4178 return -ENOMEM;
4179
4180 err = build_mapping(skb, x, ipaddr, sport);
4181 BUG_ON(err < 0);
4182
4183 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MAPPING);
4184 }
4185
xfrm_is_alive(const struct km_event * c)4186 static bool xfrm_is_alive(const struct km_event *c)
4187 {
4188 return (bool)xfrm_acquire_is_on(c->net);
4189 }
4190
4191 static struct xfrm_mgr netlink_mgr = {
4192 .notify = xfrm_send_state_notify,
4193 .acquire = xfrm_send_acquire,
4194 .compile_policy = xfrm_compile_policy,
4195 .notify_policy = xfrm_send_policy_notify,
4196 .report = xfrm_send_report,
4197 .migrate = xfrm_send_migrate,
4198 .new_mapping = xfrm_send_mapping,
4199 .is_alive = xfrm_is_alive,
4200 };
4201
xfrm_user_net_init(struct net * net)4202 static int __net_init xfrm_user_net_init(struct net *net)
4203 {
4204 struct sock *nlsk;
4205 struct netlink_kernel_cfg cfg = {
4206 .groups = XFRMNLGRP_MAX,
4207 .input = xfrm_netlink_rcv,
4208 };
4209
4210 nlsk = netlink_kernel_create(net, NETLINK_XFRM, &cfg);
4211 if (nlsk == NULL)
4212 return -ENOMEM;
4213 net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */
4214 rcu_assign_pointer(net->xfrm.nlsk, nlsk);
4215 return 0;
4216 }
4217
xfrm_user_net_pre_exit(struct net * net)4218 static void __net_exit xfrm_user_net_pre_exit(struct net *net)
4219 {
4220 RCU_INIT_POINTER(net->xfrm.nlsk, NULL);
4221 }
4222
xfrm_user_net_exit(struct list_head * net_exit_list)4223 static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list)
4224 {
4225 struct net *net;
4226
4227 list_for_each_entry(net, net_exit_list, exit_list)
4228 netlink_kernel_release(net->xfrm.nlsk_stash);
4229 }
4230
4231 static struct pernet_operations xfrm_user_net_ops = {
4232 .init = xfrm_user_net_init,
4233 .pre_exit = xfrm_user_net_pre_exit,
4234 .exit_batch = xfrm_user_net_exit,
4235 };
4236
xfrm_user_init(void)4237 static int __init xfrm_user_init(void)
4238 {
4239 int rv;
4240
4241 printk(KERN_INFO "Initializing XFRM netlink socket\n");
4242
4243 rv = register_pernet_subsys(&xfrm_user_net_ops);
4244 if (rv < 0)
4245 return rv;
4246 xfrm_register_km(&netlink_mgr);
4247 return 0;
4248 }
4249
xfrm_user_exit(void)4250 static void __exit xfrm_user_exit(void)
4251 {
4252 xfrm_unregister_km(&netlink_mgr);
4253 unregister_pernet_subsys(&xfrm_user_net_ops);
4254 }
4255
4256 module_init(xfrm_user_init);
4257 module_exit(xfrm_user_exit);
4258 MODULE_DESCRIPTION("XFRM User interface");
4259 MODULE_LICENSE("GPL");
4260 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
4261