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