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