1 // SPDX-License-Identifier: GPL-2.0-only
2 /* xfrm_user.c: User interface to configure xfrm engine.
3 *
4 * Copyright (C) 2002 David S. Miller (davem@redhat.com)
5 *
6 * Changes:
7 * Mitsuru KANDA @USAGI
8 * Kazunori MIYAZAWA @USAGI
9 * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
10 * IPv6 support
11 *
12 */
13
14 #include <linux/compat.h>
15 #include <linux/crypto.h>
16 #include <linux/module.h>
17 #include <linux/kernel.h>
18 #include <linux/types.h>
19 #include <linux/slab.h>
20 #include <linux/socket.h>
21 #include <linux/string.h>
22 #include <linux/net.h>
23 #include <linux/skbuff.h>
24 #include <linux/pfkeyv2.h>
25 #include <linux/ipsec.h>
26 #include <linux/init.h>
27 #include <linux/security.h>
28 #include <net/sock.h>
29 #include <net/xfrm.h>
30 #include <net/netlink.h>
31 #include <net/ah.h>
32 #include <linux/uaccess.h>
33 #if IS_ENABLED(CONFIG_IPV6)
34 #include <linux/in6.h>
35 #endif
36 #include <linux/unaligned.h>
37
xfrm_net_nlsk(const struct net * net,const struct sk_buff * skb)38 static struct sock *xfrm_net_nlsk(const struct net *net, const struct sk_buff *skb)
39 {
40 /* get the source of this request, see netlink_unicast_kernel */
41 const struct sock *sk = NETLINK_CB(skb).sk;
42
43 /* sk is refcounted, the netns stays alive and nlsk with it */
44 return rcu_dereference_protected(net->xfrm.nlsk, sk->sk_net_refcnt);
45 }
46
verify_one_alg(struct nlattr ** attrs,enum xfrm_attr_type_t type,struct netlink_ext_ack * extack)47 static int verify_one_alg(struct nlattr **attrs, enum xfrm_attr_type_t type,
48 struct netlink_ext_ack *extack)
49 {
50 struct nlattr *rt = attrs[type];
51 struct xfrm_algo *algp;
52
53 if (!rt)
54 return 0;
55
56 algp = nla_data(rt);
57 if (nla_len(rt) < (int)xfrm_alg_len(algp)) {
58 NL_SET_ERR_MSG(extack, "Invalid AUTH/CRYPT/COMP attribute length");
59 return -EINVAL;
60 }
61
62 switch (type) {
63 case XFRMA_ALG_AUTH:
64 case XFRMA_ALG_CRYPT:
65 case XFRMA_ALG_COMP:
66 break;
67
68 default:
69 NL_SET_ERR_MSG(extack, "Invalid algorithm attribute type");
70 return -EINVAL;
71 }
72
73 algp->alg_name[sizeof(algp->alg_name) - 1] = '\0';
74 return 0;
75 }
76
verify_auth_trunc(struct nlattr ** attrs,struct netlink_ext_ack * extack)77 static int verify_auth_trunc(struct nlattr **attrs,
78 struct netlink_ext_ack *extack)
79 {
80 struct nlattr *rt = attrs[XFRMA_ALG_AUTH_TRUNC];
81 struct xfrm_algo_auth *algp;
82
83 if (!rt)
84 return 0;
85
86 algp = nla_data(rt);
87 if (nla_len(rt) < (int)xfrm_alg_auth_len(algp)) {
88 NL_SET_ERR_MSG(extack, "Invalid AUTH_TRUNC attribute length");
89 return -EINVAL;
90 }
91
92 algp->alg_name[sizeof(algp->alg_name) - 1] = '\0';
93 return 0;
94 }
95
verify_aead(struct nlattr ** attrs,struct netlink_ext_ack * extack)96 static int verify_aead(struct nlattr **attrs, struct netlink_ext_ack *extack)
97 {
98 struct nlattr *rt = attrs[XFRMA_ALG_AEAD];
99 struct xfrm_algo_aead *algp;
100
101 if (!rt)
102 return 0;
103
104 algp = nla_data(rt);
105 if (nla_len(rt) < (int)aead_len(algp)) {
106 NL_SET_ERR_MSG(extack, "Invalid AEAD attribute length");
107 return -EINVAL;
108 }
109
110 algp->alg_name[sizeof(algp->alg_name) - 1] = '\0';
111 return 0;
112 }
113
verify_one_addr(struct nlattr ** attrs,enum xfrm_attr_type_t type,xfrm_address_t ** addrp)114 static void verify_one_addr(struct nlattr **attrs, enum xfrm_attr_type_t type,
115 xfrm_address_t **addrp)
116 {
117 struct nlattr *rt = attrs[type];
118
119 if (rt && addrp)
120 *addrp = nla_data(rt);
121 }
122
verify_sec_ctx_len(struct nlattr ** attrs,struct netlink_ext_ack * extack)123 static inline int verify_sec_ctx_len(struct nlattr **attrs, struct netlink_ext_ack *extack)
124 {
125 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
126 struct xfrm_user_sec_ctx *uctx;
127
128 if (!rt)
129 return 0;
130
131 uctx = nla_data(rt);
132 if (uctx->len > nla_len(rt) ||
133 uctx->len != (sizeof(struct xfrm_user_sec_ctx) + uctx->ctx_len)) {
134 NL_SET_ERR_MSG(extack, "Invalid security context length");
135 return -EINVAL;
136 }
137
138 return 0;
139 }
140
verify_replay(struct xfrm_usersa_info * p,struct nlattr ** attrs,u8 sa_dir,struct netlink_ext_ack * extack)141 static inline int verify_replay(struct xfrm_usersa_info *p,
142 struct nlattr **attrs, u8 sa_dir,
143 struct netlink_ext_ack *extack)
144 {
145 struct nlattr *rt = attrs[XFRMA_REPLAY_ESN_VAL];
146 struct xfrm_replay_state_esn *rs;
147
148 if (!rt) {
149 if (p->flags & XFRM_STATE_ESN) {
150 NL_SET_ERR_MSG(extack, "Missing required attribute for ESN");
151 return -EINVAL;
152 }
153 return 0;
154 }
155
156 rs = nla_data(rt);
157
158 if (rs->bmp_len > XFRMA_REPLAY_ESN_MAX / sizeof(rs->bmp[0]) / 8) {
159 NL_SET_ERR_MSG(extack, "ESN bitmap length must be <= 128");
160 return -EINVAL;
161 }
162
163 if (nla_len(rt) < (int)xfrm_replay_state_esn_len(rs) &&
164 nla_len(rt) != sizeof(*rs)) {
165 NL_SET_ERR_MSG(extack, "ESN attribute is too short to fit the full bitmap length");
166 return -EINVAL;
167 }
168
169 /* As only ESP and AH support ESN feature. */
170 if ((p->id.proto != IPPROTO_ESP) && (p->id.proto != IPPROTO_AH)) {
171 NL_SET_ERR_MSG(extack, "ESN only supported for ESP and AH");
172 return -EINVAL;
173 }
174
175 if (p->replay_window != 0) {
176 NL_SET_ERR_MSG(extack, "ESN not compatible with legacy replay_window");
177 return -EINVAL;
178 }
179
180 if (sa_dir == XFRM_SA_DIR_OUT) {
181 if (rs->replay_window) {
182 NL_SET_ERR_MSG(extack, "Replay window should be 0 for output SA");
183 return -EINVAL;
184 }
185 if (rs->seq || rs->seq_hi) {
186 NL_SET_ERR_MSG(extack,
187 "Replay seq and seq_hi should be 0 for output SA");
188 return -EINVAL;
189 }
190
191 if (!(p->flags & XFRM_STATE_ESN)) {
192 if (rs->oseq_hi) {
193 NL_SET_ERR_MSG(
194 extack,
195 "Replay oseq_hi should be 0 in non-ESN mode for output SA");
196 return -EINVAL;
197 }
198 if (rs->oseq == U32_MAX) {
199 NL_SET_ERR_MSG(
200 extack,
201 "Replay oseq should be less than 0xFFFFFFFF in non-ESN mode for output SA");
202 return -EINVAL;
203 }
204 } else {
205 if (rs->oseq == U32_MAX && rs->oseq_hi == U32_MAX) {
206 NL_SET_ERR_MSG(
207 extack,
208 "Replay oseq and oseq_hi should be less than 0xFFFFFFFF for output SA");
209 return -EINVAL;
210 }
211 }
212 if (rs->bmp_len) {
213 NL_SET_ERR_MSG(extack, "Replay bmp_len should 0 for output SA");
214 return -EINVAL;
215 }
216 }
217
218 if (sa_dir == XFRM_SA_DIR_IN) {
219 if (rs->oseq || rs->oseq_hi) {
220 NL_SET_ERR_MSG(extack,
221 "Replay oseq and oseq_hi should be 0 for input SA");
222 return -EINVAL;
223 }
224 if (!(p->flags & XFRM_STATE_ESN)) {
225 if (rs->seq_hi) {
226 NL_SET_ERR_MSG(
227 extack,
228 "Replay seq_hi should be 0 in non-ESN mode for input SA");
229 return -EINVAL;
230 }
231
232 if (rs->seq == U32_MAX) {
233 NL_SET_ERR_MSG(
234 extack,
235 "Replay seq should be less than 0xFFFFFFFF in non-ESN mode for input SA");
236 return -EINVAL;
237 }
238 } else {
239 if (rs->seq == U32_MAX && rs->seq_hi == U32_MAX) {
240 NL_SET_ERR_MSG(
241 extack,
242 "Replay seq and seq_hi should be less than 0xFFFFFFFF for input SA");
243 return -EINVAL;
244 }
245 }
246 }
247
248 return 0;
249 }
250
verify_newsa_info(struct xfrm_usersa_info * p,struct nlattr ** attrs,struct netlink_ext_ack * extack)251 static int verify_newsa_info(struct xfrm_usersa_info *p,
252 struct nlattr **attrs,
253 struct netlink_ext_ack *extack)
254 {
255 int err;
256 u8 sa_dir = nla_get_u8_default(attrs[XFRMA_SA_DIR], 0);
257 u16 family = p->sel.family;
258
259 err = -EINVAL;
260 switch (p->family) {
261 case AF_INET:
262 break;
263
264 case AF_INET6:
265 #if IS_ENABLED(CONFIG_IPV6)
266 break;
267 #else
268 err = -EAFNOSUPPORT;
269 NL_SET_ERR_MSG(extack, "IPv6 support disabled");
270 goto out;
271 #endif
272
273 default:
274 NL_SET_ERR_MSG(extack, "Invalid address family");
275 goto out;
276 }
277
278 if (!family && !(p->flags & XFRM_STATE_AF_UNSPEC))
279 family = p->family;
280
281 switch (family) {
282 case AF_UNSPEC:
283 break;
284
285 case AF_INET:
286 if (p->sel.prefixlen_d > 32 || p->sel.prefixlen_s > 32) {
287 NL_SET_ERR_MSG(extack, "Invalid prefix length in selector (must be <= 32 for IPv4)");
288 goto out;
289 }
290
291 break;
292
293 case AF_INET6:
294 #if IS_ENABLED(CONFIG_IPV6)
295 if (p->sel.prefixlen_d > 128 || p->sel.prefixlen_s > 128) {
296 NL_SET_ERR_MSG(extack, "Invalid prefix length in selector (must be <= 128 for IPv6)");
297 goto out;
298 }
299
300 break;
301 #else
302 NL_SET_ERR_MSG(extack, "IPv6 support disabled");
303 err = -EAFNOSUPPORT;
304 goto out;
305 #endif
306
307 default:
308 NL_SET_ERR_MSG(extack, "Invalid address family in selector");
309 goto out;
310 }
311
312 err = -EINVAL;
313 switch (p->id.proto) {
314 case IPPROTO_AH:
315 if (!attrs[XFRMA_ALG_AUTH] &&
316 !attrs[XFRMA_ALG_AUTH_TRUNC]) {
317 NL_SET_ERR_MSG(extack, "Missing required attribute for AH: AUTH_TRUNC or AUTH");
318 goto out;
319 }
320
321 if (attrs[XFRMA_ALG_AEAD] ||
322 attrs[XFRMA_ALG_CRYPT] ||
323 attrs[XFRMA_ALG_COMP] ||
324 attrs[XFRMA_TFCPAD]) {
325 NL_SET_ERR_MSG(extack, "Invalid attributes for AH: AEAD, CRYPT, COMP, TFCPAD");
326 goto out;
327 }
328 break;
329
330 case IPPROTO_ESP:
331 if (attrs[XFRMA_ALG_COMP]) {
332 NL_SET_ERR_MSG(extack, "Invalid attribute for ESP: COMP");
333 goto out;
334 }
335
336 if (!attrs[XFRMA_ALG_AUTH] &&
337 !attrs[XFRMA_ALG_AUTH_TRUNC] &&
338 !attrs[XFRMA_ALG_CRYPT] &&
339 !attrs[XFRMA_ALG_AEAD]) {
340 NL_SET_ERR_MSG(extack, "Missing required attribute for ESP: at least one of AUTH, AUTH_TRUNC, CRYPT, AEAD");
341 goto out;
342 }
343
344 if ((attrs[XFRMA_ALG_AUTH] ||
345 attrs[XFRMA_ALG_AUTH_TRUNC] ||
346 attrs[XFRMA_ALG_CRYPT]) &&
347 attrs[XFRMA_ALG_AEAD]) {
348 NL_SET_ERR_MSG(extack, "Invalid attribute combination for ESP: AEAD can't be used with AUTH, AUTH_TRUNC, CRYPT");
349 goto out;
350 }
351
352 if (attrs[XFRMA_TFCPAD] &&
353 p->mode != XFRM_MODE_TUNNEL) {
354 NL_SET_ERR_MSG(extack, "TFC padding can only be used in tunnel mode");
355 goto out;
356 }
357 if ((attrs[XFRMA_IPTFS_DROP_TIME] ||
358 attrs[XFRMA_IPTFS_REORDER_WINDOW] ||
359 attrs[XFRMA_IPTFS_DONT_FRAG] ||
360 attrs[XFRMA_IPTFS_INIT_DELAY] ||
361 attrs[XFRMA_IPTFS_MAX_QSIZE] ||
362 attrs[XFRMA_IPTFS_PKT_SIZE]) &&
363 p->mode != XFRM_MODE_IPTFS) {
364 NL_SET_ERR_MSG(extack, "IP-TFS options can only be used in IP-TFS mode");
365 goto out;
366 }
367 break;
368
369 case IPPROTO_COMP:
370 if (!attrs[XFRMA_ALG_COMP]) {
371 NL_SET_ERR_MSG(extack, "Missing required attribute for COMP: COMP");
372 goto out;
373 }
374
375 if (attrs[XFRMA_ALG_AEAD] ||
376 attrs[XFRMA_ALG_AUTH] ||
377 attrs[XFRMA_ALG_AUTH_TRUNC] ||
378 attrs[XFRMA_ALG_CRYPT] ||
379 attrs[XFRMA_TFCPAD]) {
380 NL_SET_ERR_MSG(extack, "Invalid attributes for COMP: AEAD, AUTH, AUTH_TRUNC, CRYPT, TFCPAD");
381 goto out;
382 }
383
384 if (ntohl(p->id.spi) >= 0x10000) {
385 NL_SET_ERR_MSG(extack, "SPI is too large for COMP (must be < 0x10000)");
386 goto out;
387 }
388 break;
389
390 #if IS_ENABLED(CONFIG_IPV6)
391 case IPPROTO_DSTOPTS:
392 case IPPROTO_ROUTING:
393 if (attrs[XFRMA_ALG_COMP] ||
394 attrs[XFRMA_ALG_AUTH] ||
395 attrs[XFRMA_ALG_AUTH_TRUNC] ||
396 attrs[XFRMA_ALG_AEAD] ||
397 attrs[XFRMA_ALG_CRYPT] ||
398 attrs[XFRMA_ENCAP] ||
399 attrs[XFRMA_SEC_CTX] ||
400 attrs[XFRMA_TFCPAD]) {
401 NL_SET_ERR_MSG(extack, "Invalid attributes for DSTOPTS/ROUTING");
402 goto out;
403 }
404
405 if (!attrs[XFRMA_COADDR]) {
406 NL_SET_ERR_MSG(extack, "Missing required COADDR attribute for DSTOPTS/ROUTING");
407 goto out;
408 }
409 break;
410 #endif
411
412 default:
413 NL_SET_ERR_MSG(extack, "Unsupported protocol");
414 goto out;
415 }
416
417 if ((err = verify_aead(attrs, extack)))
418 goto out;
419 if ((err = verify_auth_trunc(attrs, extack)))
420 goto out;
421 if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH, extack)))
422 goto out;
423 if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT, extack)))
424 goto out;
425 if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP, extack)))
426 goto out;
427 if ((err = verify_sec_ctx_len(attrs, extack)))
428 goto out;
429 if ((err = verify_replay(p, attrs, sa_dir, extack)))
430 goto out;
431
432 err = -EINVAL;
433 switch (p->mode) {
434 case XFRM_MODE_TRANSPORT:
435 case XFRM_MODE_TUNNEL:
436 case XFRM_MODE_ROUTEOPTIMIZATION:
437 case XFRM_MODE_BEET:
438 break;
439 case XFRM_MODE_IPTFS:
440 if (p->id.proto != IPPROTO_ESP) {
441 NL_SET_ERR_MSG(extack, "IP-TFS mode only supported with ESP");
442 goto out;
443 }
444 if (sa_dir == 0) {
445 NL_SET_ERR_MSG(extack, "IP-TFS mode requires in or out direction attribute");
446 goto out;
447 }
448 break;
449
450 default:
451 NL_SET_ERR_MSG(extack, "Unsupported mode");
452 goto out;
453 }
454
455 err = 0;
456
457 if (attrs[XFRMA_MTIMER_THRESH]) {
458 if (!attrs[XFRMA_ENCAP]) {
459 NL_SET_ERR_MSG(extack, "MTIMER_THRESH attribute can only be set on ENCAP states");
460 err = -EINVAL;
461 goto out;
462 }
463
464 if (sa_dir == XFRM_SA_DIR_OUT) {
465 NL_SET_ERR_MSG(extack,
466 "MTIMER_THRESH attribute should not be set on output SA");
467 err = -EINVAL;
468 goto out;
469 }
470 }
471
472 if (sa_dir == XFRM_SA_DIR_OUT) {
473 if (p->flags & XFRM_STATE_DECAP_DSCP) {
474 NL_SET_ERR_MSG(extack, "Flag DECAP_DSCP should not be set for output SA");
475 err = -EINVAL;
476 goto out;
477 }
478
479 if (p->flags & XFRM_STATE_ICMP) {
480 NL_SET_ERR_MSG(extack, "Flag ICMP should not be set for output SA");
481 err = -EINVAL;
482 goto out;
483 }
484
485 if (p->flags & XFRM_STATE_WILDRECV) {
486 NL_SET_ERR_MSG(extack, "Flag WILDRECV should not be set for output SA");
487 err = -EINVAL;
488 goto out;
489 }
490
491 if (p->replay_window) {
492 NL_SET_ERR_MSG(extack, "Replay window should be 0 for output SA");
493 err = -EINVAL;
494 goto out;
495 }
496
497 if (attrs[XFRMA_IPTFS_DROP_TIME]) {
498 NL_SET_ERR_MSG(extack, "IP-TFS drop time should not be set for output SA");
499 err = -EINVAL;
500 goto out;
501 }
502
503 if (attrs[XFRMA_IPTFS_REORDER_WINDOW]) {
504 NL_SET_ERR_MSG(extack, "IP-TFS reorder window should not be set for output SA");
505 err = -EINVAL;
506 goto out;
507 }
508
509 if (attrs[XFRMA_REPLAY_VAL]) {
510 struct xfrm_replay_state *replay;
511
512 replay = nla_data(attrs[XFRMA_REPLAY_VAL]);
513
514 if (replay->seq || replay->bitmap) {
515 NL_SET_ERR_MSG(extack,
516 "Replay seq and bitmap should be 0 for output SA");
517 err = -EINVAL;
518 goto out;
519 }
520 }
521 }
522
523 if (sa_dir == XFRM_SA_DIR_IN) {
524 if (p->flags & XFRM_STATE_NOPMTUDISC) {
525 NL_SET_ERR_MSG(extack, "Flag NOPMTUDISC should not be set for input SA");
526 err = -EINVAL;
527 goto out;
528 }
529
530 if (attrs[XFRMA_SA_EXTRA_FLAGS]) {
531 u32 xflags = nla_get_u32(attrs[XFRMA_SA_EXTRA_FLAGS]);
532
533 if (xflags & XFRM_SA_XFLAG_DONT_ENCAP_DSCP) {
534 NL_SET_ERR_MSG(extack, "Flag DONT_ENCAP_DSCP should not be set for input SA");
535 err = -EINVAL;
536 goto out;
537 }
538
539 if (xflags & XFRM_SA_XFLAG_OSEQ_MAY_WRAP) {
540 NL_SET_ERR_MSG(extack, "Flag OSEQ_MAY_WRAP should not be set for input SA");
541 err = -EINVAL;
542 goto out;
543 }
544
545 }
546
547 if (attrs[XFRMA_IPTFS_DONT_FRAG]) {
548 NL_SET_ERR_MSG(extack, "IP-TFS don't fragment should not be set for input SA");
549 err = -EINVAL;
550 goto out;
551 }
552
553 if (attrs[XFRMA_IPTFS_INIT_DELAY]) {
554 NL_SET_ERR_MSG(extack, "IP-TFS initial delay should not be set for input SA");
555 err = -EINVAL;
556 goto out;
557 }
558
559 if (attrs[XFRMA_IPTFS_MAX_QSIZE]) {
560 NL_SET_ERR_MSG(extack, "IP-TFS max queue size should not be set for input SA");
561 err = -EINVAL;
562 goto out;
563 }
564
565 if (attrs[XFRMA_IPTFS_PKT_SIZE]) {
566 NL_SET_ERR_MSG(extack, "IP-TFS packet size should not be set for input SA");
567 err = -EINVAL;
568 goto out;
569 }
570 }
571
572 if (!sa_dir && attrs[XFRMA_SA_PCPU]) {
573 NL_SET_ERR_MSG(extack, "SA_PCPU only supported with SA_DIR");
574 err = -EINVAL;
575 goto out;
576 }
577
578 out:
579 return err;
580 }
581
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)582 static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
583 struct xfrm_algo_desc *(*get_byname)(const char *, int),
584 struct nlattr *rta, struct netlink_ext_ack *extack)
585 {
586 struct xfrm_algo *p, *ualg;
587 struct xfrm_algo_desc *algo;
588
589 if (!rta)
590 return 0;
591
592 ualg = nla_data(rta);
593
594 algo = get_byname(ualg->alg_name, 1);
595 if (!algo) {
596 NL_SET_ERR_MSG(extack, "Requested COMP algorithm not found");
597 return -ENOSYS;
598 }
599 *props = algo->desc.sadb_alg_id;
600
601 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
602 if (!p)
603 return -ENOMEM;
604
605 strscpy(p->alg_name, algo->name);
606 *algpp = p;
607 return 0;
608 }
609
attach_crypt(struct xfrm_state * x,struct nlattr * rta,struct netlink_ext_ack * extack)610 static int attach_crypt(struct xfrm_state *x, struct nlattr *rta,
611 struct netlink_ext_ack *extack)
612 {
613 struct xfrm_algo *p, *ualg;
614 struct xfrm_algo_desc *algo;
615
616 if (!rta)
617 return 0;
618
619 ualg = nla_data(rta);
620
621 algo = xfrm_ealg_get_byname(ualg->alg_name, 1);
622 if (!algo) {
623 NL_SET_ERR_MSG(extack, "Requested CRYPT algorithm not found");
624 return -ENOSYS;
625 }
626 x->props.ealgo = algo->desc.sadb_alg_id;
627
628 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
629 if (!p)
630 return -ENOMEM;
631
632 strscpy(p->alg_name, algo->name);
633 x->ealg = p;
634 x->geniv = algo->uinfo.encr.geniv;
635 return 0;
636 }
637
attach_auth(struct xfrm_algo_auth ** algpp,u8 * props,struct nlattr * rta,struct netlink_ext_ack * extack)638 static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props,
639 struct nlattr *rta, struct netlink_ext_ack *extack)
640 {
641 struct xfrm_algo *ualg;
642 struct xfrm_algo_auth *p;
643 struct xfrm_algo_desc *algo;
644
645 if (!rta)
646 return 0;
647
648 ualg = nla_data(rta);
649
650 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
651 if (!algo) {
652 NL_SET_ERR_MSG(extack, "Requested AUTH algorithm not found");
653 return -ENOSYS;
654 }
655 *props = algo->desc.sadb_alg_id;
656
657 p = kmalloc(sizeof(*p) + (ualg->alg_key_len + 7) / 8, GFP_KERNEL);
658 if (!p)
659 return -ENOMEM;
660
661 strscpy(p->alg_name, algo->name);
662 p->alg_key_len = ualg->alg_key_len;
663 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
664 memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8);
665
666 *algpp = p;
667 return 0;
668 }
669
attach_auth_trunc(struct xfrm_algo_auth ** algpp,u8 * props,struct nlattr * rta,struct netlink_ext_ack * extack)670 static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props,
671 struct nlattr *rta, struct netlink_ext_ack *extack)
672 {
673 struct xfrm_algo_auth *p, *ualg;
674 struct xfrm_algo_desc *algo;
675
676 if (!rta)
677 return 0;
678
679 ualg = nla_data(rta);
680
681 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
682 if (!algo) {
683 NL_SET_ERR_MSG(extack, "Requested AUTH_TRUNC algorithm not found");
684 return -ENOSYS;
685 }
686 if (ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits) {
687 NL_SET_ERR_MSG(extack, "Invalid length requested for truncated ICV");
688 return -EINVAL;
689 }
690 *props = algo->desc.sadb_alg_id;
691
692 p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL);
693 if (!p)
694 return -ENOMEM;
695
696 strscpy(p->alg_name, algo->name);
697 if (!p->alg_trunc_len)
698 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
699
700 *algpp = p;
701 return 0;
702 }
703
attach_aead(struct xfrm_state * x,struct nlattr * rta,struct netlink_ext_ack * extack)704 static int attach_aead(struct xfrm_state *x, struct nlattr *rta,
705 struct netlink_ext_ack *extack)
706 {
707 struct xfrm_algo_aead *p, *ualg;
708 struct xfrm_algo_desc *algo;
709
710 if (!rta)
711 return 0;
712
713 ualg = nla_data(rta);
714
715 algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1);
716 if (!algo) {
717 NL_SET_ERR_MSG(extack, "Requested AEAD algorithm not found");
718 return -ENOSYS;
719 }
720 x->props.ealgo = algo->desc.sadb_alg_id;
721
722 p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL);
723 if (!p)
724 return -ENOMEM;
725
726 strscpy(p->alg_name, algo->name);
727 x->aead = p;
728 x->geniv = algo->uinfo.aead.geniv;
729 return 0;
730 }
731
xfrm_replay_verify_len(struct xfrm_replay_state_esn * replay_esn,struct nlattr * rp,struct netlink_ext_ack * extack)732 static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_esn,
733 struct nlattr *rp,
734 struct netlink_ext_ack *extack)
735 {
736 struct xfrm_replay_state_esn *up;
737 unsigned int ulen;
738
739 if (!replay_esn || !rp)
740 return 0;
741
742 up = nla_data(rp);
743 ulen = xfrm_replay_state_esn_len(up);
744
745 /* Check the overall length and the internal bitmap length to avoid
746 * potential overflow. */
747 if (nla_len(rp) < (int)ulen) {
748 NL_SET_ERR_MSG(extack, "ESN attribute is too short");
749 return -EINVAL;
750 }
751
752 if (xfrm_replay_state_esn_len(replay_esn) != ulen) {
753 NL_SET_ERR_MSG(extack, "New ESN size doesn't match the existing SA's ESN size");
754 return -EINVAL;
755 }
756
757 if (replay_esn->bmp_len != up->bmp_len) {
758 NL_SET_ERR_MSG(extack, "New ESN bitmap size doesn't match the existing SA's ESN bitmap");
759 return -EINVAL;
760 }
761
762 if (up->replay_window > up->bmp_len * sizeof(__u32) * 8) {
763 NL_SET_ERR_MSG(extack, "ESN replay window is longer than the bitmap");
764 return -EINVAL;
765 }
766
767 return 0;
768 }
769
xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn ** replay_esn,struct xfrm_replay_state_esn ** preplay_esn,struct nlattr * rta)770 static int xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn **replay_esn,
771 struct xfrm_replay_state_esn **preplay_esn,
772 struct nlattr *rta)
773 {
774 struct xfrm_replay_state_esn *p, *pp, *up;
775 unsigned int klen, ulen;
776
777 if (!rta)
778 return 0;
779
780 up = nla_data(rta);
781 klen = xfrm_replay_state_esn_len(up);
782 ulen = nla_len(rta) >= (int)klen ? klen : sizeof(*up);
783
784 p = kzalloc(klen, GFP_KERNEL);
785 if (!p)
786 return -ENOMEM;
787
788 pp = kzalloc(klen, GFP_KERNEL);
789 if (!pp) {
790 kfree(p);
791 return -ENOMEM;
792 }
793
794 memcpy(p, up, ulen);
795 memcpy(pp, up, ulen);
796
797 *replay_esn = p;
798 *preplay_esn = pp;
799
800 return 0;
801 }
802
xfrm_user_sec_ctx_size(struct xfrm_sec_ctx * xfrm_ctx)803 static inline unsigned int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx)
804 {
805 unsigned int len = 0;
806
807 if (xfrm_ctx) {
808 len += sizeof(struct xfrm_user_sec_ctx);
809 len += xfrm_ctx->ctx_len;
810 }
811 return len;
812 }
813
copy_from_user_state(struct xfrm_state * x,struct xfrm_usersa_info * p)814 static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
815 {
816 memcpy(&x->id, &p->id, sizeof(x->id));
817 memcpy(&x->sel, &p->sel, sizeof(x->sel));
818 memcpy(&x->lft, &p->lft, sizeof(x->lft));
819 x->props.mode = p->mode;
820 x->props.replay_window = min_t(unsigned int, p->replay_window,
821 sizeof(x->replay.bitmap) * 8);
822 x->props.reqid = p->reqid;
823 x->props.family = p->family;
824 memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr));
825 x->props.flags = p->flags;
826
827 if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC))
828 x->sel.family = p->family;
829 }
830
831 /*
832 * someday when pfkey also has support, we could have the code
833 * somehow made shareable and move it to xfrm_state.c - JHS
834 *
835 */
xfrm_update_ae_params(struct xfrm_state * x,struct nlattr ** attrs,int update_esn)836 static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs,
837 int update_esn)
838 {
839 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
840 struct nlattr *re = update_esn ? attrs[XFRMA_REPLAY_ESN_VAL] : NULL;
841 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
842 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
843 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
844 struct nlattr *mt = attrs[XFRMA_MTIMER_THRESH];
845
846 if (re && x->replay_esn && x->preplay_esn) {
847 struct xfrm_replay_state_esn *replay_esn;
848 replay_esn = nla_data(re);
849 memcpy(x->replay_esn, replay_esn,
850 xfrm_replay_state_esn_len(replay_esn));
851 memcpy(x->preplay_esn, replay_esn,
852 xfrm_replay_state_esn_len(replay_esn));
853 }
854
855 if (rp) {
856 struct xfrm_replay_state *replay;
857 replay = nla_data(rp);
858 memcpy(&x->replay, replay, sizeof(*replay));
859 memcpy(&x->preplay, replay, sizeof(*replay));
860 }
861
862 if (lt) {
863 struct xfrm_lifetime_cur *ltime;
864 ltime = nla_data(lt);
865 x->curlft.bytes = ltime->bytes;
866 x->curlft.packets = ltime->packets;
867 x->curlft.add_time = ltime->add_time;
868 x->curlft.use_time = ltime->use_time;
869 }
870
871 if (et)
872 x->replay_maxage = nla_get_u32(et);
873
874 if (rt)
875 x->replay_maxdiff = nla_get_u32(rt);
876
877 if (mt)
878 x->mapping_maxage = nla_get_u32(mt);
879 }
880
xfrm_smark_init(struct nlattr ** attrs,struct xfrm_mark * m)881 static void xfrm_smark_init(struct nlattr **attrs, struct xfrm_mark *m)
882 {
883 if (attrs[XFRMA_SET_MARK]) {
884 m->v = nla_get_u32(attrs[XFRMA_SET_MARK]);
885 m->m = nla_get_u32_default(attrs[XFRMA_SET_MARK_MASK],
886 0xffffffff);
887 } else {
888 m->v = m->m = 0;
889 }
890 }
891
xfrm_state_construct(struct net * net,struct xfrm_usersa_info * p,struct nlattr ** attrs,int * errp,struct netlink_ext_ack * extack)892 static struct xfrm_state *xfrm_state_construct(struct net *net,
893 struct xfrm_usersa_info *p,
894 struct nlattr **attrs,
895 int *errp,
896 struct netlink_ext_ack *extack)
897 {
898 struct xfrm_state *x = xfrm_state_alloc(net);
899 int err = -ENOMEM;
900
901 if (!x)
902 goto error_no_put;
903
904 copy_from_user_state(x, p);
905
906 if (attrs[XFRMA_ENCAP]) {
907 x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
908 sizeof(*x->encap), GFP_KERNEL);
909 if (x->encap == NULL)
910 goto error;
911 }
912
913 if (attrs[XFRMA_COADDR]) {
914 x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]),
915 sizeof(*x->coaddr), GFP_KERNEL);
916 if (x->coaddr == NULL)
917 goto error;
918 }
919
920 if (attrs[XFRMA_SA_EXTRA_FLAGS])
921 x->props.extra_flags = nla_get_u32(attrs[XFRMA_SA_EXTRA_FLAGS]);
922
923 if ((err = attach_aead(x, attrs[XFRMA_ALG_AEAD], extack)))
924 goto error;
925 if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo,
926 attrs[XFRMA_ALG_AUTH_TRUNC], extack)))
927 goto error;
928 if (!x->props.aalgo) {
929 if ((err = attach_auth(&x->aalg, &x->props.aalgo,
930 attrs[XFRMA_ALG_AUTH], extack)))
931 goto error;
932 }
933 if ((err = attach_crypt(x, attrs[XFRMA_ALG_CRYPT], extack)))
934 goto error;
935 if ((err = attach_one_algo(&x->calg, &x->props.calgo,
936 xfrm_calg_get_byname,
937 attrs[XFRMA_ALG_COMP], extack)))
938 goto error;
939
940 if (attrs[XFRMA_TFCPAD])
941 x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]);
942
943 xfrm_mark_get(attrs, &x->mark);
944
945 xfrm_smark_init(attrs, &x->props.smark);
946
947 if (attrs[XFRMA_IF_ID])
948 x->if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
949
950 if (attrs[XFRMA_SA_DIR])
951 x->dir = nla_get_u8(attrs[XFRMA_SA_DIR]);
952
953 if (attrs[XFRMA_NAT_KEEPALIVE_INTERVAL])
954 x->nat_keepalive_interval =
955 nla_get_u32(attrs[XFRMA_NAT_KEEPALIVE_INTERVAL]);
956
957 if (attrs[XFRMA_SA_PCPU]) {
958 x->pcpu_num = nla_get_u32(attrs[XFRMA_SA_PCPU]);
959 if (x->pcpu_num >= num_possible_cpus()) {
960 err = -ERANGE;
961 NL_SET_ERR_MSG(extack, "pCPU number too big");
962 goto error;
963 }
964 }
965
966 err = __xfrm_init_state(x, extack);
967 if (err)
968 goto error;
969
970 if (attrs[XFRMA_SEC_CTX]) {
971 err = security_xfrm_state_alloc(x,
972 nla_data(attrs[XFRMA_SEC_CTX]));
973 if (err)
974 goto error;
975 }
976
977 if ((err = xfrm_alloc_replay_state_esn(&x->replay_esn, &x->preplay_esn,
978 attrs[XFRMA_REPLAY_ESN_VAL])))
979 goto error;
980
981 x->km.seq = p->seq;
982 x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth;
983 /* sysctl_xfrm_aevent_etime is in 100ms units */
984 x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M;
985
986 if ((err = xfrm_init_replay(x, extack)))
987 goto error;
988
989 /* override default values from above */
990 xfrm_update_ae_params(x, attrs, 0);
991
992 xfrm_set_type_offload(x, attrs[XFRMA_OFFLOAD_DEV]);
993 /* configure the hardware if offload is requested */
994 if (attrs[XFRMA_OFFLOAD_DEV]) {
995 err = xfrm_dev_state_add(net, x,
996 nla_data(attrs[XFRMA_OFFLOAD_DEV]),
997 extack);
998 if (err)
999 goto error;
1000 }
1001
1002 if (x->mode_cbs && x->mode_cbs->user_init) {
1003 err = x->mode_cbs->user_init(net, x, attrs, extack);
1004 if (err)
1005 goto error;
1006 }
1007
1008 return x;
1009
1010 error:
1011 x->km.state = XFRM_STATE_DEAD;
1012 xfrm_state_put(x);
1013 error_no_put:
1014 *errp = err;
1015 return NULL;
1016 }
1017
xfrm_add_sa(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs,struct netlink_ext_ack * extack)1018 static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1019 struct nlattr **attrs, struct netlink_ext_ack *extack)
1020 {
1021 struct net *net = sock_net(skb->sk);
1022 struct xfrm_usersa_info *p = nlmsg_data(nlh);
1023 struct xfrm_state *x;
1024 int err;
1025 struct km_event c;
1026
1027 err = verify_newsa_info(p, attrs, extack);
1028 if (err)
1029 return err;
1030
1031 x = xfrm_state_construct(net, p, attrs, &err, extack);
1032 if (!x)
1033 return err;
1034
1035 xfrm_state_hold(x);
1036 if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
1037 err = xfrm_state_add(x);
1038 else
1039 err = xfrm_state_update(x);
1040
1041 xfrm_audit_state_add(x, err ? 0 : 1, true);
1042
1043 if (err < 0) {
1044 x->km.state = XFRM_STATE_DEAD;
1045 xfrm_dev_state_delete(x);
1046 __xfrm_state_put(x);
1047 goto out;
1048 }
1049
1050 if (x->km.state == XFRM_STATE_VOID)
1051 x->km.state = XFRM_STATE_VALID;
1052
1053 c.seq = nlh->nlmsg_seq;
1054 c.portid = nlh->nlmsg_pid;
1055 c.event = nlh->nlmsg_type;
1056
1057 km_state_notify(x, &c);
1058 out:
1059 xfrm_state_put(x);
1060 return err;
1061 }
1062
xfrm_user_state_lookup(struct net * net,struct xfrm_usersa_id * p,struct nlattr ** attrs,int * errp)1063 static struct xfrm_state *xfrm_user_state_lookup(struct net *net,
1064 struct xfrm_usersa_id *p,
1065 struct nlattr **attrs,
1066 int *errp)
1067 {
1068 struct xfrm_state *x = NULL;
1069 struct xfrm_mark m;
1070 int err;
1071 u32 mark = xfrm_mark_get(attrs, &m);
1072
1073 if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
1074 err = -ESRCH;
1075 x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family);
1076 } else {
1077 xfrm_address_t *saddr = NULL;
1078
1079 verify_one_addr(attrs, XFRMA_SRCADDR, &saddr);
1080 if (!saddr) {
1081 err = -EINVAL;
1082 goto out;
1083 }
1084
1085 err = -ESRCH;
1086 x = xfrm_state_lookup_byaddr(net, mark,
1087 &p->daddr, saddr,
1088 p->proto, p->family);
1089 }
1090
1091 out:
1092 if (!x && errp)
1093 *errp = err;
1094 return x;
1095 }
1096
xfrm_del_sa(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs,struct netlink_ext_ack * extack)1097 static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1098 struct nlattr **attrs, struct netlink_ext_ack *extack)
1099 {
1100 struct net *net = sock_net(skb->sk);
1101 struct xfrm_state *x;
1102 int err = -ESRCH;
1103 struct km_event c;
1104 struct xfrm_usersa_id *p = nlmsg_data(nlh);
1105
1106 x = xfrm_user_state_lookup(net, p, attrs, &err);
1107 if (x == NULL)
1108 return err;
1109
1110 if ((err = security_xfrm_state_delete(x)) != 0)
1111 goto out;
1112
1113 if (xfrm_state_kern(x)) {
1114 NL_SET_ERR_MSG(extack, "SA is in use by tunnels");
1115 err = -EPERM;
1116 goto out;
1117 }
1118
1119 err = xfrm_state_delete(x);
1120 if (err < 0)
1121 goto out;
1122
1123 c.seq = nlh->nlmsg_seq;
1124 c.portid = nlh->nlmsg_pid;
1125 c.event = nlh->nlmsg_type;
1126 km_state_notify(x, &c);
1127
1128 out:
1129 xfrm_audit_state_delete(x, err ? 0 : 1, true);
1130 xfrm_state_put(x);
1131 return err;
1132 }
1133
copy_to_user_state(struct xfrm_state * x,struct xfrm_usersa_info * p)1134 static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
1135 {
1136 memset(p, 0, sizeof(*p));
1137 memcpy(&p->id, &x->id, sizeof(p->id));
1138 memcpy(&p->sel, &x->sel, sizeof(p->sel));
1139 memcpy(&p->lft, &x->lft, sizeof(p->lft));
1140 if (x->xso.dev)
1141 xfrm_dev_state_update_stats(x);
1142 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
1143 put_unaligned(x->stats.replay_window, &p->stats.replay_window);
1144 put_unaligned(x->stats.replay, &p->stats.replay);
1145 put_unaligned(x->stats.integrity_failed, &p->stats.integrity_failed);
1146 memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr));
1147 p->mode = x->props.mode;
1148 p->replay_window = x->props.replay_window;
1149 p->reqid = x->props.reqid;
1150 p->family = x->props.family;
1151 p->flags = x->props.flags;
1152 p->seq = x->km.seq;
1153 }
1154
1155 struct xfrm_dump_info {
1156 struct sk_buff *in_skb;
1157 struct sk_buff *out_skb;
1158 u32 nlmsg_seq;
1159 u16 nlmsg_flags;
1160 };
1161
copy_sec_ctx(struct xfrm_sec_ctx * s,struct sk_buff * skb)1162 static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
1163 {
1164 struct xfrm_user_sec_ctx *uctx;
1165 struct nlattr *attr;
1166 int ctx_size = sizeof(*uctx) + s->ctx_len;
1167
1168 attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size);
1169 if (attr == NULL)
1170 return -EMSGSIZE;
1171
1172 uctx = nla_data(attr);
1173 uctx->exttype = XFRMA_SEC_CTX;
1174 uctx->len = ctx_size;
1175 uctx->ctx_doi = s->ctx_doi;
1176 uctx->ctx_alg = s->ctx_alg;
1177 uctx->ctx_len = s->ctx_len;
1178 memcpy(uctx + 1, s->ctx_str, s->ctx_len);
1179
1180 return 0;
1181 }
1182
copy_user_offload(struct xfrm_dev_offload * xso,struct sk_buff * skb)1183 static int copy_user_offload(struct xfrm_dev_offload *xso, struct sk_buff *skb)
1184 {
1185 struct xfrm_user_offload *xuo;
1186 struct nlattr *attr;
1187
1188 attr = nla_reserve(skb, XFRMA_OFFLOAD_DEV, sizeof(*xuo));
1189 if (attr == NULL)
1190 return -EMSGSIZE;
1191
1192 xuo = nla_data(attr);
1193 memset(xuo, 0, sizeof(*xuo));
1194 xuo->ifindex = xso->dev->ifindex;
1195 if (xso->dir == XFRM_DEV_OFFLOAD_IN)
1196 xuo->flags = XFRM_OFFLOAD_INBOUND;
1197 if (xso->type == XFRM_DEV_OFFLOAD_PACKET)
1198 xuo->flags |= XFRM_OFFLOAD_PACKET;
1199
1200 return 0;
1201 }
1202
xfrm_redact(void)1203 static bool xfrm_redact(void)
1204 {
1205 return IS_ENABLED(CONFIG_SECURITY) &&
1206 security_locked_down(LOCKDOWN_XFRM_SECRET);
1207 }
1208
copy_to_user_auth(struct xfrm_algo_auth * auth,struct sk_buff * skb)1209 static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb)
1210 {
1211 struct xfrm_algo *algo;
1212 struct xfrm_algo_auth *ap;
1213 struct nlattr *nla;
1214 bool redact_secret = xfrm_redact();
1215
1216 nla = nla_reserve(skb, XFRMA_ALG_AUTH,
1217 sizeof(*algo) + (auth->alg_key_len + 7) / 8);
1218 if (!nla)
1219 return -EMSGSIZE;
1220 algo = nla_data(nla);
1221 strscpy_pad(algo->alg_name, auth->alg_name);
1222
1223 if (redact_secret && auth->alg_key_len)
1224 memset(algo->alg_key, 0, (auth->alg_key_len + 7) / 8);
1225 else
1226 memcpy(algo->alg_key, auth->alg_key,
1227 (auth->alg_key_len + 7) / 8);
1228 algo->alg_key_len = auth->alg_key_len;
1229
1230 nla = nla_reserve(skb, XFRMA_ALG_AUTH_TRUNC, xfrm_alg_auth_len(auth));
1231 if (!nla)
1232 return -EMSGSIZE;
1233 ap = nla_data(nla);
1234 strscpy_pad(ap->alg_name, auth->alg_name);
1235 ap->alg_key_len = auth->alg_key_len;
1236 ap->alg_trunc_len = auth->alg_trunc_len;
1237 if (redact_secret && auth->alg_key_len)
1238 memset(ap->alg_key, 0, (auth->alg_key_len + 7) / 8);
1239 else
1240 memcpy(ap->alg_key, auth->alg_key,
1241 (auth->alg_key_len + 7) / 8);
1242 return 0;
1243 }
1244
copy_to_user_aead(struct xfrm_algo_aead * aead,struct sk_buff * skb)1245 static int copy_to_user_aead(struct xfrm_algo_aead *aead, struct sk_buff *skb)
1246 {
1247 struct nlattr *nla = nla_reserve(skb, XFRMA_ALG_AEAD, aead_len(aead));
1248 struct xfrm_algo_aead *ap;
1249 bool redact_secret = xfrm_redact();
1250
1251 if (!nla)
1252 return -EMSGSIZE;
1253
1254 ap = nla_data(nla);
1255 strscpy_pad(ap->alg_name, aead->alg_name);
1256 ap->alg_key_len = aead->alg_key_len;
1257 ap->alg_icv_len = aead->alg_icv_len;
1258
1259 if (redact_secret && aead->alg_key_len)
1260 memset(ap->alg_key, 0, (aead->alg_key_len + 7) / 8);
1261 else
1262 memcpy(ap->alg_key, aead->alg_key,
1263 (aead->alg_key_len + 7) / 8);
1264 return 0;
1265 }
1266
copy_to_user_ealg(struct xfrm_algo * ealg,struct sk_buff * skb)1267 static int copy_to_user_ealg(struct xfrm_algo *ealg, struct sk_buff *skb)
1268 {
1269 struct xfrm_algo *ap;
1270 bool redact_secret = xfrm_redact();
1271 struct nlattr *nla = nla_reserve(skb, XFRMA_ALG_CRYPT,
1272 xfrm_alg_len(ealg));
1273 if (!nla)
1274 return -EMSGSIZE;
1275
1276 ap = nla_data(nla);
1277 strscpy_pad(ap->alg_name, ealg->alg_name);
1278 ap->alg_key_len = ealg->alg_key_len;
1279
1280 if (redact_secret && ealg->alg_key_len)
1281 memset(ap->alg_key, 0, (ealg->alg_key_len + 7) / 8);
1282 else
1283 memcpy(ap->alg_key, ealg->alg_key,
1284 (ealg->alg_key_len + 7) / 8);
1285
1286 return 0;
1287 }
1288
copy_to_user_calg(struct xfrm_algo * calg,struct sk_buff * skb)1289 static int copy_to_user_calg(struct xfrm_algo *calg, struct sk_buff *skb)
1290 {
1291 struct nlattr *nla = nla_reserve(skb, XFRMA_ALG_COMP, sizeof(*calg));
1292 struct xfrm_algo *ap;
1293
1294 if (!nla)
1295 return -EMSGSIZE;
1296
1297 ap = nla_data(nla);
1298 strscpy_pad(ap->alg_name, calg->alg_name);
1299 ap->alg_key_len = 0;
1300
1301 return 0;
1302 }
1303
copy_to_user_encap(struct xfrm_encap_tmpl * ep,struct sk_buff * skb)1304 static int copy_to_user_encap(struct xfrm_encap_tmpl *ep, struct sk_buff *skb)
1305 {
1306 struct nlattr *nla = nla_reserve(skb, XFRMA_ENCAP, sizeof(*ep));
1307 struct xfrm_encap_tmpl *uep;
1308
1309 if (!nla)
1310 return -EMSGSIZE;
1311
1312 uep = nla_data(nla);
1313 memset(uep, 0, sizeof(*uep));
1314
1315 uep->encap_type = ep->encap_type;
1316 uep->encap_sport = ep->encap_sport;
1317 uep->encap_dport = ep->encap_dport;
1318 uep->encap_oa = ep->encap_oa;
1319
1320 return 0;
1321 }
1322
xfrm_smark_put(struct sk_buff * skb,struct xfrm_mark * m)1323 static int xfrm_smark_put(struct sk_buff *skb, struct xfrm_mark *m)
1324 {
1325 int ret = 0;
1326
1327 if (m->v | m->m) {
1328 ret = nla_put_u32(skb, XFRMA_SET_MARK, m->v);
1329 if (!ret)
1330 ret = nla_put_u32(skb, XFRMA_SET_MARK_MASK, m->m);
1331 }
1332 return ret;
1333 }
1334
1335 /* 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)1336 static int copy_to_user_state_extra(struct xfrm_state *x,
1337 struct xfrm_usersa_info *p,
1338 struct sk_buff *skb)
1339 {
1340 int ret = 0;
1341
1342 copy_to_user_state(x, p);
1343
1344 if (x->props.extra_flags) {
1345 ret = nla_put_u32(skb, XFRMA_SA_EXTRA_FLAGS,
1346 x->props.extra_flags);
1347 if (ret)
1348 goto out;
1349 }
1350
1351 if (x->coaddr) {
1352 ret = nla_put(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);
1353 if (ret)
1354 goto out;
1355 }
1356 if (x->lastused) {
1357 ret = nla_put_u64_64bit(skb, XFRMA_LASTUSED, x->lastused,
1358 XFRMA_PAD);
1359 if (ret)
1360 goto out;
1361 }
1362 if (x->aead) {
1363 ret = copy_to_user_aead(x->aead, skb);
1364 if (ret)
1365 goto out;
1366 }
1367 if (x->aalg) {
1368 ret = copy_to_user_auth(x->aalg, skb);
1369 if (ret)
1370 goto out;
1371 }
1372 if (x->ealg) {
1373 ret = copy_to_user_ealg(x->ealg, skb);
1374 if (ret)
1375 goto out;
1376 }
1377 if (x->calg) {
1378 ret = copy_to_user_calg(x->calg, skb);
1379 if (ret)
1380 goto out;
1381 }
1382 if (x->encap) {
1383 ret = copy_to_user_encap(x->encap, skb);
1384 if (ret)
1385 goto out;
1386 }
1387 if (x->tfcpad) {
1388 ret = nla_put_u32(skb, XFRMA_TFCPAD, x->tfcpad);
1389 if (ret)
1390 goto out;
1391 }
1392 ret = xfrm_mark_put(skb, &x->mark);
1393 if (ret)
1394 goto out;
1395
1396 ret = xfrm_smark_put(skb, &x->props.smark);
1397 if (ret)
1398 goto out;
1399
1400 if (x->replay_esn)
1401 ret = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
1402 xfrm_replay_state_esn_len(x->replay_esn),
1403 x->replay_esn);
1404 else
1405 ret = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
1406 &x->replay);
1407 if (ret)
1408 goto out;
1409 if(x->xso.dev)
1410 ret = copy_user_offload(&x->xso, skb);
1411 if (ret)
1412 goto out;
1413 if (x->if_id) {
1414 ret = nla_put_u32(skb, XFRMA_IF_ID, x->if_id);
1415 if (ret)
1416 goto out;
1417 }
1418 if (x->security) {
1419 ret = copy_sec_ctx(x->security, skb);
1420 if (ret)
1421 goto out;
1422 }
1423 if (x->mode_cbs && x->mode_cbs->copy_to_user)
1424 ret = x->mode_cbs->copy_to_user(x, skb);
1425 if (ret)
1426 goto out;
1427 if (x->mapping_maxage) {
1428 ret = nla_put_u32(skb, XFRMA_MTIMER_THRESH, x->mapping_maxage);
1429 if (ret)
1430 goto out;
1431 }
1432 if (x->pcpu_num != UINT_MAX) {
1433 ret = nla_put_u32(skb, XFRMA_SA_PCPU, x->pcpu_num);
1434 if (ret)
1435 goto out;
1436 }
1437 if (x->dir)
1438 ret = nla_put_u8(skb, XFRMA_SA_DIR, x->dir);
1439
1440 if (x->nat_keepalive_interval) {
1441 ret = nla_put_u32(skb, XFRMA_NAT_KEEPALIVE_INTERVAL,
1442 x->nat_keepalive_interval);
1443 if (ret)
1444 goto out;
1445 }
1446 out:
1447 return ret;
1448 }
1449
dump_one_state(struct xfrm_state * x,int count,void * ptr)1450 static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
1451 {
1452 struct xfrm_dump_info *sp = ptr;
1453 struct sk_buff *in_skb = sp->in_skb;
1454 struct sk_buff *skb = sp->out_skb;
1455 struct xfrm_translator *xtr;
1456 struct xfrm_usersa_info *p;
1457 struct nlmsghdr *nlh;
1458 int err;
1459
1460 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
1461 XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags);
1462 if (nlh == NULL)
1463 return -EMSGSIZE;
1464
1465 p = nlmsg_data(nlh);
1466
1467 err = copy_to_user_state_extra(x, p, skb);
1468 if (err) {
1469 nlmsg_cancel(skb, nlh);
1470 return err;
1471 }
1472 nlmsg_end(skb, nlh);
1473
1474 xtr = xfrm_get_translator();
1475 if (xtr) {
1476 err = xtr->alloc_compat(skb, nlh);
1477
1478 xfrm_put_translator(xtr);
1479 if (err) {
1480 nlmsg_cancel(skb, nlh);
1481 return err;
1482 }
1483 }
1484
1485 return 0;
1486 }
1487
xfrm_dump_sa_done(struct netlink_callback * cb)1488 static int xfrm_dump_sa_done(struct netlink_callback *cb)
1489 {
1490 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
1491 struct sock *sk = cb->skb->sk;
1492 struct net *net = sock_net(sk);
1493
1494 if (cb->args[0])
1495 xfrm_state_walk_done(walk, net);
1496 return 0;
1497 }
1498
xfrm_dump_sa(struct sk_buff * skb,struct netlink_callback * cb)1499 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
1500 {
1501 struct net *net = sock_net(skb->sk);
1502 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
1503 struct xfrm_dump_info info;
1504
1505 BUILD_BUG_ON(sizeof(struct xfrm_state_walk) >
1506 sizeof(cb->args) - sizeof(cb->args[0]));
1507
1508 info.in_skb = cb->skb;
1509 info.out_skb = skb;
1510 info.nlmsg_seq = cb->nlh->nlmsg_seq;
1511 info.nlmsg_flags = NLM_F_MULTI;
1512
1513 if (!cb->args[0]) {
1514 struct nlattr *attrs[XFRMA_MAX+1];
1515 struct xfrm_address_filter *filter = NULL;
1516 u8 proto = 0;
1517 int err;
1518
1519 err = nlmsg_parse_deprecated(cb->nlh, 0, attrs, XFRMA_MAX,
1520 xfrma_policy, cb->extack);
1521 if (err < 0)
1522 return err;
1523
1524 if (attrs[XFRMA_ADDRESS_FILTER]) {
1525 filter = kmemdup(nla_data(attrs[XFRMA_ADDRESS_FILTER]),
1526 sizeof(*filter), GFP_KERNEL);
1527 if (filter == NULL)
1528 return -ENOMEM;
1529
1530 /* see addr_match(), (prefix length >> 5) << 2
1531 * will be used to compare xfrm_address_t
1532 */
1533 if (filter->splen > (sizeof(xfrm_address_t) << 3) ||
1534 filter->dplen > (sizeof(xfrm_address_t) << 3)) {
1535 kfree(filter);
1536 return -EINVAL;
1537 }
1538 }
1539
1540 if (attrs[XFRMA_PROTO])
1541 proto = nla_get_u8(attrs[XFRMA_PROTO]);
1542
1543 xfrm_state_walk_init(walk, proto, filter);
1544 cb->args[0] = 1;
1545 }
1546
1547 (void) xfrm_state_walk(net, walk, dump_one_state, &info);
1548
1549 return skb->len;
1550 }
1551
xfrm_state_netlink(struct sk_buff * in_skb,struct xfrm_state * x,u32 seq)1552 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
1553 struct xfrm_state *x, u32 seq)
1554 {
1555 struct xfrm_dump_info info;
1556 struct sk_buff *skb;
1557 int err;
1558
1559 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1560 if (!skb)
1561 return ERR_PTR(-ENOMEM);
1562
1563 info.in_skb = in_skb;
1564 info.out_skb = skb;
1565 info.nlmsg_seq = seq;
1566 info.nlmsg_flags = 0;
1567
1568 err = dump_one_state(x, 0, &info);
1569 if (err) {
1570 kfree_skb(skb);
1571 return ERR_PTR(err);
1572 }
1573
1574 return skb;
1575 }
1576
1577 /* A wrapper for nlmsg_multicast() checking that nlsk is still available.
1578 * Must be called with RCU read lock.
1579 */
xfrm_nlmsg_multicast(struct net * net,struct sk_buff * skb,u32 pid,unsigned int group)1580 static inline int xfrm_nlmsg_multicast(struct net *net, struct sk_buff *skb,
1581 u32 pid, unsigned int group)
1582 {
1583 struct sock *nlsk = rcu_dereference(net->xfrm.nlsk);
1584 struct xfrm_translator *xtr;
1585
1586 if (!nlsk) {
1587 kfree_skb(skb);
1588 return -EPIPE;
1589 }
1590
1591 xtr = xfrm_get_translator();
1592 if (xtr) {
1593 int err = xtr->alloc_compat(skb, nlmsg_hdr(skb));
1594
1595 xfrm_put_translator(xtr);
1596 if (err) {
1597 kfree_skb(skb);
1598 return err;
1599 }
1600 }
1601
1602 return nlmsg_multicast(nlsk, skb, pid, group, GFP_ATOMIC);
1603 }
1604
xfrm_spdinfo_msgsize(void)1605 static inline unsigned int xfrm_spdinfo_msgsize(void)
1606 {
1607 return NLMSG_ALIGN(4)
1608 + nla_total_size(sizeof(struct xfrmu_spdinfo))
1609 + nla_total_size(sizeof(struct xfrmu_spdhinfo))
1610 + nla_total_size(sizeof(struct xfrmu_spdhthresh))
1611 + nla_total_size(sizeof(struct xfrmu_spdhthresh));
1612 }
1613
build_spdinfo(struct sk_buff * skb,struct net * net,u32 portid,u32 seq,u32 flags)1614 static int build_spdinfo(struct sk_buff *skb, struct net *net,
1615 u32 portid, u32 seq, u32 flags)
1616 {
1617 struct xfrmk_spdinfo si;
1618 struct xfrmu_spdinfo spc;
1619 struct xfrmu_spdhinfo sph;
1620 struct xfrmu_spdhthresh spt4, spt6;
1621 struct nlmsghdr *nlh;
1622 int err;
1623 u32 *f;
1624 unsigned lseq;
1625
1626 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0);
1627 if (nlh == NULL) /* shouldn't really happen ... */
1628 return -EMSGSIZE;
1629
1630 f = nlmsg_data(nlh);
1631 *f = flags;
1632 xfrm_spd_getinfo(net, &si);
1633 spc.incnt = si.incnt;
1634 spc.outcnt = si.outcnt;
1635 spc.fwdcnt = si.fwdcnt;
1636 spc.inscnt = si.inscnt;
1637 spc.outscnt = si.outscnt;
1638 spc.fwdscnt = si.fwdscnt;
1639 sph.spdhcnt = si.spdhcnt;
1640 sph.spdhmcnt = si.spdhmcnt;
1641
1642 do {
1643 lseq = read_seqbegin(&net->xfrm.policy_hthresh.lock);
1644
1645 spt4.lbits = net->xfrm.policy_hthresh.lbits4;
1646 spt4.rbits = net->xfrm.policy_hthresh.rbits4;
1647 spt6.lbits = net->xfrm.policy_hthresh.lbits6;
1648 spt6.rbits = net->xfrm.policy_hthresh.rbits6;
1649 } while (read_seqretry(&net->xfrm.policy_hthresh.lock, lseq));
1650
1651 err = nla_put(skb, XFRMA_SPD_INFO, sizeof(spc), &spc);
1652 if (!err)
1653 err = nla_put(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph);
1654 if (!err)
1655 err = nla_put(skb, XFRMA_SPD_IPV4_HTHRESH, sizeof(spt4), &spt4);
1656 if (!err)
1657 err = nla_put(skb, XFRMA_SPD_IPV6_HTHRESH, sizeof(spt6), &spt6);
1658 if (err) {
1659 nlmsg_cancel(skb, nlh);
1660 return err;
1661 }
1662
1663 nlmsg_end(skb, nlh);
1664 return 0;
1665 }
1666
xfrm_set_spdinfo(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs,struct netlink_ext_ack * extack)1667 static int xfrm_set_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1668 struct nlattr **attrs,
1669 struct netlink_ext_ack *extack)
1670 {
1671 struct net *net = sock_net(skb->sk);
1672 struct xfrmu_spdhthresh *thresh4 = NULL;
1673 struct xfrmu_spdhthresh *thresh6 = NULL;
1674
1675 /* selector prefixlen thresholds to hash policies */
1676 if (attrs[XFRMA_SPD_IPV4_HTHRESH]) {
1677 struct nlattr *rta = attrs[XFRMA_SPD_IPV4_HTHRESH];
1678
1679 if (nla_len(rta) < sizeof(*thresh4)) {
1680 NL_SET_ERR_MSG(extack, "Invalid SPD_IPV4_HTHRESH attribute length");
1681 return -EINVAL;
1682 }
1683 thresh4 = nla_data(rta);
1684 if (thresh4->lbits > 32 || thresh4->rbits > 32) {
1685 NL_SET_ERR_MSG(extack, "Invalid hash threshold (must be <= 32 for IPv4)");
1686 return -EINVAL;
1687 }
1688 }
1689 if (attrs[XFRMA_SPD_IPV6_HTHRESH]) {
1690 struct nlattr *rta = attrs[XFRMA_SPD_IPV6_HTHRESH];
1691
1692 if (nla_len(rta) < sizeof(*thresh6)) {
1693 NL_SET_ERR_MSG(extack, "Invalid SPD_IPV6_HTHRESH attribute length");
1694 return -EINVAL;
1695 }
1696 thresh6 = nla_data(rta);
1697 if (thresh6->lbits > 128 || thresh6->rbits > 128) {
1698 NL_SET_ERR_MSG(extack, "Invalid hash threshold (must be <= 128 for IPv6)");
1699 return -EINVAL;
1700 }
1701 }
1702
1703 if (thresh4 || thresh6) {
1704 write_seqlock(&net->xfrm.policy_hthresh.lock);
1705 if (thresh4) {
1706 net->xfrm.policy_hthresh.lbits4 = thresh4->lbits;
1707 net->xfrm.policy_hthresh.rbits4 = thresh4->rbits;
1708 }
1709 if (thresh6) {
1710 net->xfrm.policy_hthresh.lbits6 = thresh6->lbits;
1711 net->xfrm.policy_hthresh.rbits6 = thresh6->rbits;
1712 }
1713 write_sequnlock(&net->xfrm.policy_hthresh.lock);
1714
1715 xfrm_policy_hash_rebuild(net);
1716 }
1717
1718 return 0;
1719 }
1720
xfrm_get_spdinfo(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs,struct netlink_ext_ack * extack)1721 static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1722 struct nlattr **attrs,
1723 struct netlink_ext_ack *extack)
1724 {
1725 struct net *net = sock_net(skb->sk);
1726 struct sk_buff *r_skb;
1727 u32 *flags = nlmsg_data(nlh);
1728 u32 sportid = NETLINK_CB(skb).portid;
1729 u32 seq = nlh->nlmsg_seq;
1730 int err;
1731
1732 r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC);
1733 if (r_skb == NULL)
1734 return -ENOMEM;
1735
1736 err = build_spdinfo(r_skb, net, sportid, seq, *flags);
1737 BUG_ON(err < 0);
1738
1739 return nlmsg_unicast(xfrm_net_nlsk(net, skb), r_skb, sportid);
1740 }
1741
xfrm_sadinfo_msgsize(void)1742 static inline unsigned int xfrm_sadinfo_msgsize(void)
1743 {
1744 return NLMSG_ALIGN(4)
1745 + nla_total_size(sizeof(struct xfrmu_sadhinfo))
1746 + nla_total_size(4); /* XFRMA_SAD_CNT */
1747 }
1748
build_sadinfo(struct sk_buff * skb,struct net * net,u32 portid,u32 seq,u32 flags)1749 static int build_sadinfo(struct sk_buff *skb, struct net *net,
1750 u32 portid, u32 seq, u32 flags)
1751 {
1752 struct xfrmk_sadinfo si;
1753 struct xfrmu_sadhinfo sh;
1754 struct nlmsghdr *nlh;
1755 int err;
1756 u32 *f;
1757
1758 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0);
1759 if (nlh == NULL) /* shouldn't really happen ... */
1760 return -EMSGSIZE;
1761
1762 f = nlmsg_data(nlh);
1763 *f = flags;
1764 xfrm_sad_getinfo(net, &si);
1765
1766 sh.sadhmcnt = si.sadhmcnt;
1767 sh.sadhcnt = si.sadhcnt;
1768
1769 err = nla_put_u32(skb, XFRMA_SAD_CNT, si.sadcnt);
1770 if (!err)
1771 err = nla_put(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh);
1772 if (err) {
1773 nlmsg_cancel(skb, nlh);
1774 return err;
1775 }
1776
1777 nlmsg_end(skb, nlh);
1778 return 0;
1779 }
1780
xfrm_get_sadinfo(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs,struct netlink_ext_ack * extack)1781 static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1782 struct nlattr **attrs,
1783 struct netlink_ext_ack *extack)
1784 {
1785 struct net *net = sock_net(skb->sk);
1786 struct sk_buff *r_skb;
1787 u32 *flags = nlmsg_data(nlh);
1788 u32 sportid = NETLINK_CB(skb).portid;
1789 u32 seq = nlh->nlmsg_seq;
1790 int err;
1791
1792 r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC);
1793 if (r_skb == NULL)
1794 return -ENOMEM;
1795
1796 err = build_sadinfo(r_skb, net, sportid, seq, *flags);
1797 BUG_ON(err < 0);
1798
1799 return nlmsg_unicast(xfrm_net_nlsk(net, skb), r_skb, sportid);
1800 }
1801
xfrm_get_sa(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs,struct netlink_ext_ack * extack)1802 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1803 struct nlattr **attrs, struct netlink_ext_ack *extack)
1804 {
1805 struct net *net = sock_net(skb->sk);
1806 struct xfrm_usersa_id *p = nlmsg_data(nlh);
1807 struct xfrm_state *x;
1808 struct sk_buff *resp_skb;
1809 int err = -ESRCH;
1810
1811 x = xfrm_user_state_lookup(net, p, attrs, &err);
1812 if (x == NULL)
1813 goto out_noput;
1814
1815 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1816 if (IS_ERR(resp_skb)) {
1817 err = PTR_ERR(resp_skb);
1818 } else {
1819 err = nlmsg_unicast(xfrm_net_nlsk(net, skb), resp_skb, NETLINK_CB(skb).portid);
1820 }
1821 xfrm_state_put(x);
1822 out_noput:
1823 return err;
1824 }
1825
xfrm_alloc_userspi(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs,struct netlink_ext_ack * extack)1826 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
1827 struct nlattr **attrs,
1828 struct netlink_ext_ack *extack)
1829 {
1830 struct net *net = sock_net(skb->sk);
1831 struct xfrm_state *x;
1832 struct xfrm_userspi_info *p;
1833 struct xfrm_translator *xtr;
1834 struct sk_buff *resp_skb;
1835 xfrm_address_t *daddr;
1836 int family;
1837 int err;
1838 u32 mark;
1839 struct xfrm_mark m;
1840 u32 if_id = 0;
1841 u32 pcpu_num = UINT_MAX;
1842
1843 p = nlmsg_data(nlh);
1844 err = verify_spi_info(p->info.id.proto, p->min, p->max, extack);
1845 if (err)
1846 goto out_noput;
1847
1848 family = p->info.family;
1849 daddr = &p->info.id.daddr;
1850
1851 x = NULL;
1852
1853 mark = xfrm_mark_get(attrs, &m);
1854
1855 if (attrs[XFRMA_IF_ID])
1856 if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
1857
1858 if (attrs[XFRMA_SA_PCPU]) {
1859 pcpu_num = nla_get_u32(attrs[XFRMA_SA_PCPU]);
1860 if (pcpu_num >= num_possible_cpus()) {
1861 err = -EINVAL;
1862 NL_SET_ERR_MSG(extack, "pCPU number too big");
1863 goto out_noput;
1864 }
1865 }
1866
1867 if (p->info.seq) {
1868 x = xfrm_find_acq_byseq(net, mark, p->info.seq, pcpu_num);
1869 if (x && !xfrm_addr_equal(&x->id.daddr, daddr, family)) {
1870 xfrm_state_put(x);
1871 x = NULL;
1872 }
1873 }
1874
1875 if (!x)
1876 x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid,
1877 if_id, pcpu_num, p->info.id.proto, daddr,
1878 &p->info.saddr, 1,
1879 family);
1880 err = -ENOENT;
1881 if (!x) {
1882 NL_SET_ERR_MSG(extack, "Target ACQUIRE not found");
1883 goto out_noput;
1884 }
1885
1886 err = xfrm_alloc_spi(x, p->min, p->max, extack);
1887 if (err)
1888 goto out;
1889
1890 if (attrs[XFRMA_SA_DIR])
1891 x->dir = nla_get_u8(attrs[XFRMA_SA_DIR]);
1892
1893 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1894 if (IS_ERR(resp_skb)) {
1895 err = PTR_ERR(resp_skb);
1896 goto out;
1897 }
1898
1899 xtr = xfrm_get_translator();
1900 if (xtr) {
1901 err = xtr->alloc_compat(skb, nlmsg_hdr(skb));
1902
1903 xfrm_put_translator(xtr);
1904 if (err) {
1905 kfree_skb(resp_skb);
1906 goto out;
1907 }
1908 }
1909
1910 err = nlmsg_unicast(xfrm_net_nlsk(net, skb), resp_skb, NETLINK_CB(skb).portid);
1911
1912 out:
1913 xfrm_state_put(x);
1914 out_noput:
1915 return err;
1916 }
1917
verify_policy_dir(u8 dir,struct netlink_ext_ack * extack)1918 static int verify_policy_dir(u8 dir, struct netlink_ext_ack *extack)
1919 {
1920 switch (dir) {
1921 case XFRM_POLICY_IN:
1922 case XFRM_POLICY_OUT:
1923 case XFRM_POLICY_FWD:
1924 break;
1925
1926 default:
1927 NL_SET_ERR_MSG(extack, "Invalid policy direction");
1928 return -EINVAL;
1929 }
1930
1931 return 0;
1932 }
1933
verify_policy_type(u8 type,struct netlink_ext_ack * extack)1934 static int verify_policy_type(u8 type, struct netlink_ext_ack *extack)
1935 {
1936 switch (type) {
1937 case XFRM_POLICY_TYPE_MAIN:
1938 #ifdef CONFIG_XFRM_SUB_POLICY
1939 case XFRM_POLICY_TYPE_SUB:
1940 #endif
1941 break;
1942
1943 default:
1944 NL_SET_ERR_MSG(extack, "Invalid policy type");
1945 return -EINVAL;
1946 }
1947
1948 return 0;
1949 }
1950
verify_newpolicy_info(struct xfrm_userpolicy_info * p,struct netlink_ext_ack * extack)1951 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p,
1952 struct netlink_ext_ack *extack)
1953 {
1954 int ret;
1955
1956 switch (p->share) {
1957 case XFRM_SHARE_ANY:
1958 case XFRM_SHARE_SESSION:
1959 case XFRM_SHARE_USER:
1960 case XFRM_SHARE_UNIQUE:
1961 break;
1962
1963 default:
1964 NL_SET_ERR_MSG(extack, "Invalid policy share");
1965 return -EINVAL;
1966 }
1967
1968 switch (p->action) {
1969 case XFRM_POLICY_ALLOW:
1970 case XFRM_POLICY_BLOCK:
1971 break;
1972
1973 default:
1974 NL_SET_ERR_MSG(extack, "Invalid policy action");
1975 return -EINVAL;
1976 }
1977
1978 switch (p->sel.family) {
1979 case AF_INET:
1980 if (p->sel.prefixlen_d > 32 || p->sel.prefixlen_s > 32) {
1981 NL_SET_ERR_MSG(extack, "Invalid prefix length in selector (must be <= 32 for IPv4)");
1982 return -EINVAL;
1983 }
1984
1985 break;
1986
1987 case AF_INET6:
1988 #if IS_ENABLED(CONFIG_IPV6)
1989 if (p->sel.prefixlen_d > 128 || p->sel.prefixlen_s > 128) {
1990 NL_SET_ERR_MSG(extack, "Invalid prefix length in selector (must be <= 128 for IPv6)");
1991 return -EINVAL;
1992 }
1993
1994 break;
1995 #else
1996 NL_SET_ERR_MSG(extack, "IPv6 support disabled");
1997 return -EAFNOSUPPORT;
1998 #endif
1999
2000 default:
2001 NL_SET_ERR_MSG(extack, "Invalid selector family");
2002 return -EINVAL;
2003 }
2004
2005 ret = verify_policy_dir(p->dir, extack);
2006 if (ret)
2007 return ret;
2008 if (p->index && (xfrm_policy_id2dir(p->index) != p->dir)) {
2009 NL_SET_ERR_MSG(extack, "Policy index doesn't match direction");
2010 return -EINVAL;
2011 }
2012
2013 return 0;
2014 }
2015
copy_from_user_sec_ctx(struct xfrm_policy * pol,struct nlattr ** attrs)2016 static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs)
2017 {
2018 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
2019 struct xfrm_user_sec_ctx *uctx;
2020
2021 if (!rt)
2022 return 0;
2023
2024 uctx = nla_data(rt);
2025 return security_xfrm_policy_alloc(&pol->security, uctx, GFP_KERNEL);
2026 }
2027
copy_templates(struct xfrm_policy * xp,struct xfrm_user_tmpl * ut,int nr)2028 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
2029 int nr)
2030 {
2031 int i;
2032
2033 xp->xfrm_nr = nr;
2034 for (i = 0; i < nr; i++, ut++) {
2035 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
2036
2037 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
2038 memcpy(&t->saddr, &ut->saddr,
2039 sizeof(xfrm_address_t));
2040 t->reqid = ut->reqid;
2041 t->mode = ut->mode;
2042 t->share = ut->share;
2043 t->optional = ut->optional;
2044 t->aalgos = ut->aalgos;
2045 t->ealgos = ut->ealgos;
2046 t->calgos = ut->calgos;
2047 /* If all masks are ~0, then we allow all algorithms. */
2048 t->allalgs = !~(t->aalgos & t->ealgos & t->calgos);
2049 t->encap_family = ut->family;
2050 }
2051 }
2052
validate_tmpl(int nr,struct xfrm_user_tmpl * ut,u16 family,int dir,struct netlink_ext_ack * extack)2053 static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family,
2054 int dir, struct netlink_ext_ack *extack)
2055 {
2056 u16 prev_family;
2057 int i;
2058
2059 if (nr > XFRM_MAX_DEPTH) {
2060 NL_SET_ERR_MSG(extack, "Template count must be <= XFRM_MAX_DEPTH (" __stringify(XFRM_MAX_DEPTH) ")");
2061 return -EINVAL;
2062 }
2063
2064 prev_family = family;
2065
2066 for (i = 0; i < nr; i++) {
2067 /* We never validated the ut->family value, so many
2068 * applications simply leave it at zero. The check was
2069 * never made and ut->family was ignored because all
2070 * templates could be assumed to have the same family as
2071 * the policy itself. Now that we will have ipv4-in-ipv6
2072 * and ipv6-in-ipv4 tunnels, this is no longer true.
2073 */
2074 if (!ut[i].family)
2075 ut[i].family = family;
2076
2077 switch (ut[i].mode) {
2078 case XFRM_MODE_TUNNEL:
2079 case XFRM_MODE_BEET:
2080 if (ut[i].optional && dir == XFRM_POLICY_OUT) {
2081 NL_SET_ERR_MSG(extack, "Mode in optional template not allowed in outbound policy");
2082 return -EINVAL;
2083 }
2084 break;
2085 case XFRM_MODE_IPTFS:
2086 break;
2087 default:
2088 if (ut[i].family != prev_family) {
2089 NL_SET_ERR_MSG(extack, "Mode in template doesn't support a family change");
2090 return -EINVAL;
2091 }
2092 break;
2093 }
2094 if (ut[i].mode >= XFRM_MODE_MAX) {
2095 NL_SET_ERR_MSG(extack, "Mode in template must be < XFRM_MODE_MAX (" __stringify(XFRM_MODE_MAX) ")");
2096 return -EINVAL;
2097 }
2098
2099 prev_family = ut[i].family;
2100
2101 switch (ut[i].family) {
2102 case AF_INET:
2103 break;
2104 #if IS_ENABLED(CONFIG_IPV6)
2105 case AF_INET6:
2106 break;
2107 #endif
2108 default:
2109 NL_SET_ERR_MSG(extack, "Invalid family in template");
2110 return -EINVAL;
2111 }
2112
2113 if (!xfrm_id_proto_valid(ut[i].id.proto)) {
2114 NL_SET_ERR_MSG(extack, "Invalid XFRM protocol in template");
2115 return -EINVAL;
2116 }
2117 }
2118
2119 return 0;
2120 }
2121
copy_from_user_tmpl(struct xfrm_policy * pol,struct nlattr ** attrs,int dir,struct netlink_ext_ack * extack)2122 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs,
2123 int dir, struct netlink_ext_ack *extack)
2124 {
2125 struct nlattr *rt = attrs[XFRMA_TMPL];
2126
2127 if (!rt) {
2128 pol->xfrm_nr = 0;
2129 } else {
2130 struct xfrm_user_tmpl *utmpl = nla_data(rt);
2131 int nr = nla_len(rt) / sizeof(*utmpl);
2132 int err;
2133
2134 err = validate_tmpl(nr, utmpl, pol->family, dir, extack);
2135 if (err)
2136 return err;
2137
2138 copy_templates(pol, utmpl, nr);
2139 }
2140 return 0;
2141 }
2142
copy_from_user_policy_type(u8 * tp,struct nlattr ** attrs,struct netlink_ext_ack * extack)2143 static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs,
2144 struct netlink_ext_ack *extack)
2145 {
2146 struct nlattr *rt = attrs[XFRMA_POLICY_TYPE];
2147 struct xfrm_userpolicy_type *upt;
2148 u8 type = XFRM_POLICY_TYPE_MAIN;
2149 int err;
2150
2151 if (rt) {
2152 upt = nla_data(rt);
2153 type = upt->type;
2154 }
2155
2156 err = verify_policy_type(type, extack);
2157 if (err)
2158 return err;
2159
2160 *tp = type;
2161 return 0;
2162 }
2163
copy_from_user_policy(struct xfrm_policy * xp,struct xfrm_userpolicy_info * p)2164 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
2165 {
2166 xp->priority = p->priority;
2167 xp->index = p->index;
2168 memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
2169 memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
2170 xp->action = p->action;
2171 xp->flags = p->flags;
2172 xp->family = p->sel.family;
2173 /* XXX xp->share = p->share; */
2174 }
2175
copy_to_user_policy(struct xfrm_policy * xp,struct xfrm_userpolicy_info * p,int dir)2176 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
2177 {
2178 memset(p, 0, sizeof(*p));
2179 memcpy(&p->sel, &xp->selector, sizeof(p->sel));
2180 memcpy(&p->lft, &xp->lft, sizeof(p->lft));
2181 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
2182 p->priority = xp->priority;
2183 p->index = xp->index;
2184 p->sel.family = xp->family;
2185 p->dir = dir;
2186 p->action = xp->action;
2187 p->flags = xp->flags;
2188 p->share = XFRM_SHARE_ANY; /* XXX xp->share */
2189 }
2190
xfrm_policy_construct(struct net * net,struct xfrm_userpolicy_info * p,struct nlattr ** attrs,int * errp,struct netlink_ext_ack * extack)2191 static struct xfrm_policy *xfrm_policy_construct(struct net *net,
2192 struct xfrm_userpolicy_info *p,
2193 struct nlattr **attrs,
2194 int *errp,
2195 struct netlink_ext_ack *extack)
2196 {
2197 struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL);
2198 int err;
2199
2200 if (!xp) {
2201 *errp = -ENOMEM;
2202 return NULL;
2203 }
2204
2205 copy_from_user_policy(xp, p);
2206
2207 err = copy_from_user_policy_type(&xp->type, attrs, extack);
2208 if (err)
2209 goto error;
2210
2211 if (!(err = copy_from_user_tmpl(xp, attrs, p->dir, extack)))
2212 err = copy_from_user_sec_ctx(xp, attrs);
2213 if (err)
2214 goto error;
2215
2216 xfrm_mark_get(attrs, &xp->mark);
2217
2218 if (attrs[XFRMA_IF_ID])
2219 xp->if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
2220
2221 /* configure the hardware if offload is requested */
2222 if (attrs[XFRMA_OFFLOAD_DEV]) {
2223 err = xfrm_dev_policy_add(net, xp,
2224 nla_data(attrs[XFRMA_OFFLOAD_DEV]),
2225 p->dir, extack);
2226 if (err)
2227 goto error;
2228 }
2229
2230 return xp;
2231 error:
2232 *errp = err;
2233 xp->walk.dead = 1;
2234 xfrm_policy_destroy(xp);
2235 return NULL;
2236 }
2237
xfrm_add_policy(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs,struct netlink_ext_ack * extack)2238 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
2239 struct nlattr **attrs,
2240 struct netlink_ext_ack *extack)
2241 {
2242 struct net *net = sock_net(skb->sk);
2243 struct xfrm_userpolicy_info *p = nlmsg_data(nlh);
2244 struct xfrm_policy *xp;
2245 struct km_event c;
2246 int err;
2247 int excl;
2248
2249 err = verify_newpolicy_info(p, extack);
2250 if (err)
2251 return err;
2252 err = verify_sec_ctx_len(attrs, extack);
2253 if (err)
2254 return err;
2255
2256 xp = xfrm_policy_construct(net, p, attrs, &err, extack);
2257 if (!xp)
2258 return err;
2259
2260 /* shouldn't excl be based on nlh flags??
2261 * Aha! this is anti-netlink really i.e more pfkey derived
2262 * in netlink excl is a flag and you wouldn't need
2263 * a type XFRM_MSG_UPDPOLICY - JHS */
2264 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
2265 err = xfrm_policy_insert(p->dir, xp, excl);
2266 xfrm_audit_policy_add(xp, err ? 0 : 1, true);
2267
2268 if (err) {
2269 xfrm_dev_policy_delete(xp);
2270 xfrm_dev_policy_free(xp);
2271 security_xfrm_policy_free(xp->security);
2272 kfree(xp);
2273 return err;
2274 }
2275
2276 c.event = nlh->nlmsg_type;
2277 c.seq = nlh->nlmsg_seq;
2278 c.portid = nlh->nlmsg_pid;
2279 km_policy_notify(xp, p->dir, &c);
2280
2281 xfrm_pol_put(xp);
2282
2283 return 0;
2284 }
2285
copy_to_user_tmpl(struct xfrm_policy * xp,struct sk_buff * skb)2286 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
2287 {
2288 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
2289 int i;
2290
2291 if (xp->xfrm_nr == 0)
2292 return 0;
2293
2294 if (xp->xfrm_nr > XFRM_MAX_DEPTH)
2295 return -ENOBUFS;
2296
2297 for (i = 0; i < xp->xfrm_nr; i++) {
2298 struct xfrm_user_tmpl *up = &vec[i];
2299 struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
2300
2301 memset(up, 0, sizeof(*up));
2302 memcpy(&up->id, &kp->id, sizeof(up->id));
2303 up->family = kp->encap_family;
2304 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
2305 up->reqid = kp->reqid;
2306 up->mode = kp->mode;
2307 up->share = kp->share;
2308 up->optional = kp->optional;
2309 up->aalgos = kp->aalgos;
2310 up->ealgos = kp->ealgos;
2311 up->calgos = kp->calgos;
2312 }
2313
2314 return nla_put(skb, XFRMA_TMPL,
2315 sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec);
2316 }
2317
copy_to_user_state_sec_ctx(struct xfrm_state * x,struct sk_buff * skb)2318 static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
2319 {
2320 if (x->security) {
2321 return copy_sec_ctx(x->security, skb);
2322 }
2323 return 0;
2324 }
2325
copy_to_user_sec_ctx(struct xfrm_policy * xp,struct sk_buff * skb)2326 static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
2327 {
2328 if (xp->security)
2329 return copy_sec_ctx(xp->security, skb);
2330 return 0;
2331 }
userpolicy_type_attrsize(void)2332 static inline unsigned int userpolicy_type_attrsize(void)
2333 {
2334 #ifdef CONFIG_XFRM_SUB_POLICY
2335 return nla_total_size(sizeof(struct xfrm_userpolicy_type));
2336 #else
2337 return 0;
2338 #endif
2339 }
2340
2341 #ifdef CONFIG_XFRM_SUB_POLICY
copy_to_user_policy_type(u8 type,struct sk_buff * skb)2342 static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
2343 {
2344 struct xfrm_userpolicy_type upt;
2345
2346 /* Sadly there are two holes in struct xfrm_userpolicy_type */
2347 memset(&upt, 0, sizeof(upt));
2348 upt.type = type;
2349
2350 return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
2351 }
2352
2353 #else
copy_to_user_policy_type(u8 type,struct sk_buff * skb)2354 static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
2355 {
2356 return 0;
2357 }
2358 #endif
2359
dump_one_policy(struct xfrm_policy * xp,int dir,int count,void * ptr)2360 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
2361 {
2362 struct xfrm_dump_info *sp = ptr;
2363 struct xfrm_userpolicy_info *p;
2364 struct sk_buff *in_skb = sp->in_skb;
2365 struct sk_buff *skb = sp->out_skb;
2366 struct xfrm_translator *xtr;
2367 struct nlmsghdr *nlh;
2368 int err;
2369
2370 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
2371 XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags);
2372 if (nlh == NULL)
2373 return -EMSGSIZE;
2374
2375 p = nlmsg_data(nlh);
2376 copy_to_user_policy(xp, p, dir);
2377 err = copy_to_user_tmpl(xp, skb);
2378 if (!err)
2379 err = copy_to_user_sec_ctx(xp, skb);
2380 if (!err)
2381 err = copy_to_user_policy_type(xp->type, skb);
2382 if (!err)
2383 err = xfrm_mark_put(skb, &xp->mark);
2384 if (!err)
2385 err = xfrm_if_id_put(skb, xp->if_id);
2386 if (!err && xp->xdo.dev)
2387 err = copy_user_offload(&xp->xdo, skb);
2388 if (err) {
2389 nlmsg_cancel(skb, nlh);
2390 return err;
2391 }
2392 nlmsg_end(skb, nlh);
2393
2394 xtr = xfrm_get_translator();
2395 if (xtr) {
2396 err = xtr->alloc_compat(skb, nlh);
2397
2398 xfrm_put_translator(xtr);
2399 if (err) {
2400 nlmsg_cancel(skb, nlh);
2401 return err;
2402 }
2403 }
2404
2405 return 0;
2406 }
2407
xfrm_dump_policy_done(struct netlink_callback * cb)2408 static int xfrm_dump_policy_done(struct netlink_callback *cb)
2409 {
2410 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
2411 struct net *net = sock_net(cb->skb->sk);
2412
2413 xfrm_policy_walk_done(walk, net);
2414 return 0;
2415 }
2416
xfrm_dump_policy_start(struct netlink_callback * cb)2417 static int xfrm_dump_policy_start(struct netlink_callback *cb)
2418 {
2419 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
2420
2421 BUILD_BUG_ON(sizeof(*walk) > sizeof(cb->args));
2422
2423 xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY);
2424 return 0;
2425 }
2426
xfrm_dump_policy(struct sk_buff * skb,struct netlink_callback * cb)2427 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
2428 {
2429 struct net *net = sock_net(skb->sk);
2430 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
2431 struct xfrm_dump_info info;
2432
2433 info.in_skb = cb->skb;
2434 info.out_skb = skb;
2435 info.nlmsg_seq = cb->nlh->nlmsg_seq;
2436 info.nlmsg_flags = NLM_F_MULTI;
2437
2438 (void) xfrm_policy_walk(net, walk, dump_one_policy, &info);
2439
2440 return skb->len;
2441 }
2442
xfrm_policy_netlink(struct sk_buff * in_skb,struct xfrm_policy * xp,int dir,u32 seq)2443 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
2444 struct xfrm_policy *xp,
2445 int dir, u32 seq)
2446 {
2447 struct xfrm_dump_info info;
2448 struct sk_buff *skb;
2449 int err;
2450
2451 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2452 if (!skb)
2453 return ERR_PTR(-ENOMEM);
2454
2455 info.in_skb = in_skb;
2456 info.out_skb = skb;
2457 info.nlmsg_seq = seq;
2458 info.nlmsg_flags = 0;
2459
2460 err = dump_one_policy(xp, dir, 0, &info);
2461 if (err) {
2462 kfree_skb(skb);
2463 return ERR_PTR(err);
2464 }
2465
2466 return skb;
2467 }
2468
xfrm_notify_userpolicy(struct net * net)2469 static int xfrm_notify_userpolicy(struct net *net)
2470 {
2471 struct xfrm_userpolicy_default *up;
2472 int len = NLMSG_ALIGN(sizeof(*up));
2473 struct nlmsghdr *nlh;
2474 struct sk_buff *skb;
2475 int err;
2476
2477 skb = nlmsg_new(len, GFP_ATOMIC);
2478 if (skb == NULL)
2479 return -ENOMEM;
2480
2481 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_GETDEFAULT, sizeof(*up), 0);
2482 if (nlh == NULL) {
2483 kfree_skb(skb);
2484 return -EMSGSIZE;
2485 }
2486
2487 up = nlmsg_data(nlh);
2488 up->in = net->xfrm.policy_default[XFRM_POLICY_IN];
2489 up->fwd = net->xfrm.policy_default[XFRM_POLICY_FWD];
2490 up->out = net->xfrm.policy_default[XFRM_POLICY_OUT];
2491
2492 nlmsg_end(skb, nlh);
2493
2494 rcu_read_lock();
2495 err = xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
2496 rcu_read_unlock();
2497
2498 return err;
2499 }
2500
xfrm_userpolicy_is_valid(__u8 policy)2501 static bool xfrm_userpolicy_is_valid(__u8 policy)
2502 {
2503 return policy == XFRM_USERPOLICY_BLOCK ||
2504 policy == XFRM_USERPOLICY_ACCEPT;
2505 }
2506
xfrm_set_default(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs,struct netlink_ext_ack * extack)2507 static int xfrm_set_default(struct sk_buff *skb, struct nlmsghdr *nlh,
2508 struct nlattr **attrs, struct netlink_ext_ack *extack)
2509 {
2510 struct net *net = sock_net(skb->sk);
2511 struct xfrm_userpolicy_default *up = nlmsg_data(nlh);
2512
2513 if (xfrm_userpolicy_is_valid(up->in))
2514 net->xfrm.policy_default[XFRM_POLICY_IN] = up->in;
2515
2516 if (xfrm_userpolicy_is_valid(up->fwd))
2517 net->xfrm.policy_default[XFRM_POLICY_FWD] = up->fwd;
2518
2519 if (xfrm_userpolicy_is_valid(up->out))
2520 net->xfrm.policy_default[XFRM_POLICY_OUT] = up->out;
2521
2522 rt_genid_bump_all(net);
2523
2524 xfrm_notify_userpolicy(net);
2525 return 0;
2526 }
2527
xfrm_get_default(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs,struct netlink_ext_ack * extack)2528 static int xfrm_get_default(struct sk_buff *skb, struct nlmsghdr *nlh,
2529 struct nlattr **attrs, struct netlink_ext_ack *extack)
2530 {
2531 struct sk_buff *r_skb;
2532 struct nlmsghdr *r_nlh;
2533 struct net *net = sock_net(skb->sk);
2534 struct xfrm_userpolicy_default *r_up;
2535 int len = NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_default));
2536 u32 portid = NETLINK_CB(skb).portid;
2537 u32 seq = nlh->nlmsg_seq;
2538
2539 r_skb = nlmsg_new(len, GFP_ATOMIC);
2540 if (!r_skb)
2541 return -ENOMEM;
2542
2543 r_nlh = nlmsg_put(r_skb, portid, seq, XFRM_MSG_GETDEFAULT, sizeof(*r_up), 0);
2544 if (!r_nlh) {
2545 kfree_skb(r_skb);
2546 return -EMSGSIZE;
2547 }
2548
2549 r_up = nlmsg_data(r_nlh);
2550 r_up->in = net->xfrm.policy_default[XFRM_POLICY_IN];
2551 r_up->fwd = net->xfrm.policy_default[XFRM_POLICY_FWD];
2552 r_up->out = net->xfrm.policy_default[XFRM_POLICY_OUT];
2553 nlmsg_end(r_skb, r_nlh);
2554
2555 return nlmsg_unicast(xfrm_net_nlsk(net, skb), r_skb, portid);
2556 }
2557
xfrm_get_policy(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs,struct netlink_ext_ack * extack)2558 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
2559 struct nlattr **attrs,
2560 struct netlink_ext_ack *extack)
2561 {
2562 struct net *net = sock_net(skb->sk);
2563 struct xfrm_policy *xp;
2564 struct xfrm_userpolicy_id *p;
2565 u8 type = XFRM_POLICY_TYPE_MAIN;
2566 int err;
2567 struct km_event c;
2568 int delete;
2569 struct xfrm_mark m;
2570 u32 if_id = 0;
2571
2572 p = nlmsg_data(nlh);
2573 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
2574
2575 err = copy_from_user_policy_type(&type, attrs, extack);
2576 if (err)
2577 return err;
2578
2579 err = verify_policy_dir(p->dir, extack);
2580 if (err)
2581 return err;
2582
2583 if (attrs[XFRMA_IF_ID])
2584 if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
2585
2586 xfrm_mark_get(attrs, &m);
2587
2588 if (p->index)
2589 xp = xfrm_policy_byid(net, &m, if_id, type, p->dir,
2590 p->index, delete, &err);
2591 else {
2592 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
2593 struct xfrm_sec_ctx *ctx;
2594
2595 err = verify_sec_ctx_len(attrs, extack);
2596 if (err)
2597 return err;
2598
2599 ctx = NULL;
2600 if (rt) {
2601 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
2602
2603 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
2604 if (err)
2605 return err;
2606 }
2607 xp = xfrm_policy_bysel_ctx(net, &m, if_id, type, p->dir,
2608 &p->sel, ctx, delete, &err);
2609 security_xfrm_policy_free(ctx);
2610 }
2611 if (xp == NULL)
2612 return -ENOENT;
2613
2614 if (!delete) {
2615 struct sk_buff *resp_skb;
2616
2617 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
2618 if (IS_ERR(resp_skb)) {
2619 err = PTR_ERR(resp_skb);
2620 } else {
2621 err = nlmsg_unicast(xfrm_net_nlsk(net, skb), resp_skb,
2622 NETLINK_CB(skb).portid);
2623 }
2624 } else {
2625 xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
2626
2627 if (err != 0)
2628 goto out;
2629
2630 c.data.byid = p->index;
2631 c.event = nlh->nlmsg_type;
2632 c.seq = nlh->nlmsg_seq;
2633 c.portid = nlh->nlmsg_pid;
2634 km_policy_notify(xp, p->dir, &c);
2635 }
2636
2637 out:
2638 xfrm_pol_put(xp);
2639 return err;
2640 }
2641
xfrm_flush_sa(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs,struct netlink_ext_ack * extack)2642 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
2643 struct nlattr **attrs,
2644 struct netlink_ext_ack *extack)
2645 {
2646 struct net *net = sock_net(skb->sk);
2647 struct km_event c;
2648 struct xfrm_usersa_flush *p = nlmsg_data(nlh);
2649 int err;
2650
2651 err = xfrm_state_flush(net, p->proto, true);
2652 if (err) {
2653 if (err == -ESRCH) /* empty table */
2654 return 0;
2655 return err;
2656 }
2657 c.data.proto = p->proto;
2658 c.event = nlh->nlmsg_type;
2659 c.seq = nlh->nlmsg_seq;
2660 c.portid = nlh->nlmsg_pid;
2661 c.net = net;
2662 km_state_notify(NULL, &c);
2663
2664 return 0;
2665 }
2666
xfrm_aevent_msgsize(struct xfrm_state * x)2667 static inline unsigned int xfrm_aevent_msgsize(struct xfrm_state *x)
2668 {
2669 unsigned int replay_size = x->replay_esn ?
2670 xfrm_replay_state_esn_len(x->replay_esn) :
2671 sizeof(struct xfrm_replay_state);
2672
2673 return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id))
2674 + nla_total_size(replay_size)
2675 + nla_total_size_64bit(sizeof(struct xfrm_lifetime_cur))
2676 + nla_total_size(sizeof(struct xfrm_mark))
2677 + nla_total_size(4) /* XFRM_AE_RTHR */
2678 + nla_total_size(4) /* XFRM_AE_ETHR */
2679 + nla_total_size(sizeof(x->dir)) /* XFRMA_SA_DIR */
2680 + nla_total_size(4); /* XFRMA_SA_PCPU */
2681 }
2682
build_aevent(struct sk_buff * skb,struct xfrm_state * x,const struct km_event * c)2683 static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
2684 {
2685 struct xfrm_aevent_id *id;
2686 struct nlmsghdr *nlh;
2687 int err;
2688
2689 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0);
2690 if (nlh == NULL)
2691 return -EMSGSIZE;
2692
2693 id = nlmsg_data(nlh);
2694 memset(&id->sa_id, 0, sizeof(id->sa_id));
2695 memcpy(&id->sa_id.daddr, &x->id.daddr, sizeof(x->id.daddr));
2696 id->sa_id.spi = x->id.spi;
2697 id->sa_id.family = x->props.family;
2698 id->sa_id.proto = x->id.proto;
2699 memcpy(&id->saddr, &x->props.saddr, sizeof(x->props.saddr));
2700 id->reqid = x->props.reqid;
2701 id->flags = c->data.aevent;
2702
2703 if (x->replay_esn) {
2704 err = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
2705 xfrm_replay_state_esn_len(x->replay_esn),
2706 x->replay_esn);
2707 } else {
2708 err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
2709 &x->replay);
2710 }
2711 if (err)
2712 goto out_cancel;
2713 err = nla_put_64bit(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft,
2714 XFRMA_PAD);
2715 if (err)
2716 goto out_cancel;
2717
2718 if (id->flags & XFRM_AE_RTHR) {
2719 err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff);
2720 if (err)
2721 goto out_cancel;
2722 }
2723 if (id->flags & XFRM_AE_ETHR) {
2724 err = nla_put_u32(skb, XFRMA_ETIMER_THRESH,
2725 x->replay_maxage * 10 / HZ);
2726 if (err)
2727 goto out_cancel;
2728 }
2729 err = xfrm_mark_put(skb, &x->mark);
2730 if (err)
2731 goto out_cancel;
2732
2733 err = xfrm_if_id_put(skb, x->if_id);
2734 if (err)
2735 goto out_cancel;
2736 if (x->pcpu_num != UINT_MAX) {
2737 err = nla_put_u32(skb, XFRMA_SA_PCPU, x->pcpu_num);
2738 if (err)
2739 goto out_cancel;
2740 }
2741
2742 if (x->dir) {
2743 err = nla_put_u8(skb, XFRMA_SA_DIR, x->dir);
2744 if (err)
2745 goto out_cancel;
2746 }
2747
2748 nlmsg_end(skb, nlh);
2749 return 0;
2750
2751 out_cancel:
2752 nlmsg_cancel(skb, nlh);
2753 return err;
2754 }
2755
xfrm_get_ae(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs,struct netlink_ext_ack * extack)2756 static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
2757 struct nlattr **attrs, struct netlink_ext_ack *extack)
2758 {
2759 struct net *net = sock_net(skb->sk);
2760 struct xfrm_state *x;
2761 struct sk_buff *r_skb;
2762 int err;
2763 struct km_event c;
2764 u32 mark;
2765 struct xfrm_mark m;
2766 struct xfrm_aevent_id *p = nlmsg_data(nlh);
2767 struct xfrm_usersa_id *id = &p->sa_id;
2768
2769 mark = xfrm_mark_get(attrs, &m);
2770
2771 x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family);
2772 if (x == NULL)
2773 return -ESRCH;
2774
2775 r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
2776 if (r_skb == NULL) {
2777 xfrm_state_put(x);
2778 return -ENOMEM;
2779 }
2780
2781 /*
2782 * XXX: is this lock really needed - none of the other
2783 * gets lock (the concern is things getting updated
2784 * while we are still reading) - jhs
2785 */
2786 spin_lock_bh(&x->lock);
2787 c.data.aevent = p->flags;
2788 c.seq = nlh->nlmsg_seq;
2789 c.portid = nlh->nlmsg_pid;
2790
2791 err = build_aevent(r_skb, x, &c);
2792 BUG_ON(err < 0);
2793
2794 err = nlmsg_unicast(xfrm_net_nlsk(net, skb), r_skb, NETLINK_CB(skb).portid);
2795 spin_unlock_bh(&x->lock);
2796 xfrm_state_put(x);
2797 return err;
2798 }
2799
xfrm_new_ae(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs,struct netlink_ext_ack * extack)2800 static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
2801 struct nlattr **attrs, struct netlink_ext_ack *extack)
2802 {
2803 struct net *net = sock_net(skb->sk);
2804 struct xfrm_state *x;
2805 struct km_event c;
2806 int err = -EINVAL;
2807 u32 mark = 0;
2808 struct xfrm_mark m;
2809 struct xfrm_aevent_id *p = nlmsg_data(nlh);
2810 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
2811 struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL];
2812 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
2813 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
2814 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
2815
2816 if (!lt && !rp && !re && !et && !rt) {
2817 NL_SET_ERR_MSG(extack, "Missing required attribute for AE");
2818 return err;
2819 }
2820
2821 /* pedantic mode - thou shalt sayeth replaceth */
2822 if (!(nlh->nlmsg_flags & NLM_F_REPLACE)) {
2823 NL_SET_ERR_MSG(extack, "NLM_F_REPLACE flag is required");
2824 return err;
2825 }
2826
2827 mark = xfrm_mark_get(attrs, &m);
2828
2829 x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
2830 if (x == NULL)
2831 return -ESRCH;
2832
2833 if (x->km.state != XFRM_STATE_VALID) {
2834 NL_SET_ERR_MSG(extack, "SA must be in VALID state");
2835 goto out;
2836 }
2837
2838 err = xfrm_replay_verify_len(x->replay_esn, re, extack);
2839 if (err)
2840 goto out;
2841
2842 spin_lock_bh(&x->lock);
2843 xfrm_update_ae_params(x, attrs, 1);
2844 spin_unlock_bh(&x->lock);
2845
2846 c.event = nlh->nlmsg_type;
2847 c.seq = nlh->nlmsg_seq;
2848 c.portid = nlh->nlmsg_pid;
2849 c.data.aevent = XFRM_AE_CU;
2850 km_state_notify(x, &c);
2851 err = 0;
2852 out:
2853 xfrm_state_put(x);
2854 return err;
2855 }
2856
xfrm_flush_policy(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs,struct netlink_ext_ack * extack)2857 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
2858 struct nlattr **attrs,
2859 struct netlink_ext_ack *extack)
2860 {
2861 struct net *net = sock_net(skb->sk);
2862 struct km_event c;
2863 u8 type = XFRM_POLICY_TYPE_MAIN;
2864 int err;
2865
2866 err = copy_from_user_policy_type(&type, attrs, extack);
2867 if (err)
2868 return err;
2869
2870 err = xfrm_policy_flush(net, type, true);
2871 if (err) {
2872 if (err == -ESRCH) /* empty table */
2873 return 0;
2874 return err;
2875 }
2876
2877 c.data.type = type;
2878 c.event = nlh->nlmsg_type;
2879 c.seq = nlh->nlmsg_seq;
2880 c.portid = nlh->nlmsg_pid;
2881 c.net = net;
2882 km_policy_notify(NULL, 0, &c);
2883 return 0;
2884 }
2885
xfrm_add_pol_expire(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs,struct netlink_ext_ack * extack)2886 static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
2887 struct nlattr **attrs,
2888 struct netlink_ext_ack *extack)
2889 {
2890 struct net *net = sock_net(skb->sk);
2891 struct xfrm_policy *xp;
2892 struct xfrm_user_polexpire *up = nlmsg_data(nlh);
2893 struct xfrm_userpolicy_info *p = &up->pol;
2894 u8 type = XFRM_POLICY_TYPE_MAIN;
2895 int err = -ENOENT;
2896 struct xfrm_mark m;
2897 u32 if_id = 0;
2898
2899 err = copy_from_user_policy_type(&type, attrs, extack);
2900 if (err)
2901 return err;
2902
2903 err = verify_policy_dir(p->dir, extack);
2904 if (err)
2905 return err;
2906
2907 if (attrs[XFRMA_IF_ID])
2908 if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
2909
2910 xfrm_mark_get(attrs, &m);
2911
2912 if (p->index)
2913 xp = xfrm_policy_byid(net, &m, if_id, type, p->dir, p->index,
2914 0, &err);
2915 else {
2916 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
2917 struct xfrm_sec_ctx *ctx;
2918
2919 err = verify_sec_ctx_len(attrs, extack);
2920 if (err)
2921 return err;
2922
2923 ctx = NULL;
2924 if (rt) {
2925 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
2926
2927 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
2928 if (err)
2929 return err;
2930 }
2931 xp = xfrm_policy_bysel_ctx(net, &m, if_id, type, p->dir,
2932 &p->sel, ctx, 0, &err);
2933 security_xfrm_policy_free(ctx);
2934 }
2935 if (xp == NULL)
2936 return -ENOENT;
2937
2938 if (unlikely(xp->walk.dead))
2939 goto out;
2940
2941 err = 0;
2942 if (up->hard) {
2943 xfrm_policy_delete(xp, p->dir);
2944 xfrm_audit_policy_delete(xp, 1, true);
2945 }
2946 km_policy_expired(xp, p->dir, up->hard, nlh->nlmsg_pid);
2947
2948 out:
2949 xfrm_pol_put(xp);
2950 return err;
2951 }
2952
xfrm_add_sa_expire(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs,struct netlink_ext_ack * extack)2953 static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
2954 struct nlattr **attrs,
2955 struct netlink_ext_ack *extack)
2956 {
2957 struct net *net = sock_net(skb->sk);
2958 struct xfrm_state *x;
2959 int err;
2960 struct xfrm_user_expire *ue = nlmsg_data(nlh);
2961 struct xfrm_usersa_info *p = &ue->state;
2962 struct xfrm_mark m;
2963 u32 mark = xfrm_mark_get(attrs, &m);
2964
2965 x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family);
2966
2967 err = -ENOENT;
2968 if (x == NULL)
2969 return err;
2970
2971 spin_lock_bh(&x->lock);
2972 err = -EINVAL;
2973 if (x->km.state != XFRM_STATE_VALID) {
2974 NL_SET_ERR_MSG(extack, "SA must be in VALID state");
2975 goto out;
2976 }
2977
2978 km_state_expired(x, ue->hard, nlh->nlmsg_pid);
2979
2980 if (ue->hard) {
2981 __xfrm_state_delete(x);
2982 xfrm_audit_state_delete(x, 1, true);
2983 }
2984 err = 0;
2985 out:
2986 spin_unlock_bh(&x->lock);
2987 xfrm_state_put(x);
2988 return err;
2989 }
2990
xfrm_add_acquire(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs,struct netlink_ext_ack * extack)2991 static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
2992 struct nlattr **attrs,
2993 struct netlink_ext_ack *extack)
2994 {
2995 struct net *net = sock_net(skb->sk);
2996 struct xfrm_policy *xp;
2997 struct xfrm_user_tmpl *ut;
2998 int i;
2999 struct nlattr *rt = attrs[XFRMA_TMPL];
3000 struct xfrm_mark mark;
3001
3002 struct xfrm_user_acquire *ua = nlmsg_data(nlh);
3003 struct xfrm_state *x = xfrm_state_alloc(net);
3004 int err = -ENOMEM;
3005
3006 if (!x)
3007 goto nomem;
3008
3009 xfrm_mark_get(attrs, &mark);
3010
3011 if (attrs[XFRMA_SA_PCPU]) {
3012 x->pcpu_num = nla_get_u32(attrs[XFRMA_SA_PCPU]);
3013 err = -EINVAL;
3014 if (x->pcpu_num >= num_possible_cpus()) {
3015 NL_SET_ERR_MSG(extack, "pCPU number too big");
3016 goto free_state;
3017 }
3018 }
3019
3020 err = verify_newpolicy_info(&ua->policy, extack);
3021 if (err)
3022 goto free_state;
3023 err = verify_sec_ctx_len(attrs, extack);
3024 if (err)
3025 goto free_state;
3026
3027 /* build an XP */
3028 xp = xfrm_policy_construct(net, &ua->policy, attrs, &err, extack);
3029 if (!xp)
3030 goto free_state;
3031
3032 memcpy(&x->id, &ua->id, sizeof(ua->id));
3033 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
3034 memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
3035 xp->mark.m = x->mark.m = mark.m;
3036 xp->mark.v = x->mark.v = mark.v;
3037 ut = nla_data(rt);
3038 /* extract the templates and for each call km_key */
3039 for (i = 0; i < xp->xfrm_nr; i++, ut++) {
3040 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
3041 memcpy(&x->id, &t->id, sizeof(x->id));
3042 x->props.mode = t->mode;
3043 x->props.reqid = t->reqid;
3044 x->props.family = ut->family;
3045 t->aalgos = ua->aalgos;
3046 t->ealgos = ua->ealgos;
3047 t->calgos = ua->calgos;
3048 err = km_query(x, t, xp);
3049
3050 }
3051
3052 xfrm_state_free(x);
3053 xfrm_dev_policy_delete(xp);
3054 xfrm_dev_policy_free(xp);
3055 security_xfrm_policy_free(xp->security);
3056 kfree(xp);
3057
3058 return 0;
3059
3060 free_state:
3061 xfrm_state_free(x);
3062 nomem:
3063 return err;
3064 }
3065
3066 #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)3067 static int copy_from_user_migrate(struct xfrm_migrate *ma,
3068 struct xfrm_kmaddress *k,
3069 struct nlattr **attrs, int *num,
3070 struct netlink_ext_ack *extack)
3071 {
3072 struct nlattr *rt = attrs[XFRMA_MIGRATE];
3073 struct xfrm_user_migrate *um;
3074 int i, num_migrate;
3075
3076 if (k != NULL) {
3077 struct xfrm_user_kmaddress *uk;
3078
3079 uk = nla_data(attrs[XFRMA_KMADDRESS]);
3080 memcpy(&k->local, &uk->local, sizeof(k->local));
3081 memcpy(&k->remote, &uk->remote, sizeof(k->remote));
3082 k->family = uk->family;
3083 k->reserved = uk->reserved;
3084 }
3085
3086 um = nla_data(rt);
3087 num_migrate = nla_len(rt) / sizeof(*um);
3088
3089 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH) {
3090 NL_SET_ERR_MSG(extack, "Invalid number of SAs to migrate, must be 0 < num <= XFRM_MAX_DEPTH (6)");
3091 return -EINVAL;
3092 }
3093
3094 for (i = 0; i < num_migrate; i++, um++, ma++) {
3095 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
3096 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
3097 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
3098 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));
3099
3100 ma->proto = um->proto;
3101 ma->mode = um->mode;
3102 ma->reqid = um->reqid;
3103
3104 ma->old_family = um->old_family;
3105 ma->new_family = um->new_family;
3106 }
3107
3108 *num = i;
3109 return 0;
3110 }
3111
xfrm_do_migrate(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs,struct netlink_ext_ack * extack)3112 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
3113 struct nlattr **attrs, struct netlink_ext_ack *extack)
3114 {
3115 struct xfrm_userpolicy_id *pi = nlmsg_data(nlh);
3116 struct xfrm_migrate m[XFRM_MAX_DEPTH];
3117 struct xfrm_kmaddress km, *kmp;
3118 u8 type;
3119 int err;
3120 int n = 0;
3121 struct net *net = sock_net(skb->sk);
3122 struct xfrm_encap_tmpl *encap = NULL;
3123 struct xfrm_user_offload *xuo = NULL;
3124 u32 if_id = 0;
3125
3126 if (!attrs[XFRMA_MIGRATE]) {
3127 NL_SET_ERR_MSG(extack, "Missing required MIGRATE attribute");
3128 return -EINVAL;
3129 }
3130
3131 kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL;
3132
3133 err = copy_from_user_policy_type(&type, attrs, extack);
3134 if (err)
3135 return err;
3136
3137 err = copy_from_user_migrate(m, kmp, attrs, &n, extack);
3138 if (err)
3139 return err;
3140
3141 if (!n)
3142 return 0;
3143
3144 if (attrs[XFRMA_ENCAP]) {
3145 encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
3146 sizeof(*encap), GFP_KERNEL);
3147 if (!encap)
3148 return -ENOMEM;
3149 }
3150
3151 if (attrs[XFRMA_IF_ID])
3152 if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
3153
3154 if (attrs[XFRMA_OFFLOAD_DEV]) {
3155 xuo = kmemdup(nla_data(attrs[XFRMA_OFFLOAD_DEV]),
3156 sizeof(*xuo), GFP_KERNEL);
3157 if (!xuo) {
3158 err = -ENOMEM;
3159 goto error;
3160 }
3161 }
3162 err = xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp, net, encap,
3163 if_id, extack, xuo);
3164 error:
3165 kfree(encap);
3166 kfree(xuo);
3167 return err;
3168 }
3169 #else
xfrm_do_migrate(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs,struct netlink_ext_ack * extack)3170 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
3171 struct nlattr **attrs, struct netlink_ext_ack *extack)
3172 {
3173 return -ENOPROTOOPT;
3174 }
3175 #endif
3176
3177 #ifdef CONFIG_XFRM_MIGRATE
copy_to_user_migrate(const struct xfrm_migrate * m,struct sk_buff * skb)3178 static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb)
3179 {
3180 struct xfrm_user_migrate um;
3181
3182 memset(&um, 0, sizeof(um));
3183 um.proto = m->proto;
3184 um.mode = m->mode;
3185 um.reqid = m->reqid;
3186 um.old_family = m->old_family;
3187 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
3188 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
3189 um.new_family = m->new_family;
3190 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
3191 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));
3192
3193 return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um);
3194 }
3195
copy_to_user_kmaddress(const struct xfrm_kmaddress * k,struct sk_buff * skb)3196 static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb)
3197 {
3198 struct xfrm_user_kmaddress uk;
3199
3200 memset(&uk, 0, sizeof(uk));
3201 uk.family = k->family;
3202 uk.reserved = k->reserved;
3203 memcpy(&uk.local, &k->local, sizeof(uk.local));
3204 memcpy(&uk.remote, &k->remote, sizeof(uk.remote));
3205
3206 return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk);
3207 }
3208
xfrm_migrate_msgsize(int num_migrate,int with_kma,int with_encp)3209 static inline unsigned int xfrm_migrate_msgsize(int num_migrate, int with_kma,
3210 int with_encp)
3211 {
3212 return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id))
3213 + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0)
3214 + (with_encp ? nla_total_size(sizeof(struct xfrm_encap_tmpl)) : 0)
3215 + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate)
3216 + userpolicy_type_attrsize();
3217 }
3218
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)3219 static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m,
3220 int num_migrate, const struct xfrm_kmaddress *k,
3221 const struct xfrm_selector *sel,
3222 const struct xfrm_encap_tmpl *encap, u8 dir, u8 type)
3223 {
3224 const struct xfrm_migrate *mp;
3225 struct xfrm_userpolicy_id *pol_id;
3226 struct nlmsghdr *nlh;
3227 int i, err;
3228
3229 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0);
3230 if (nlh == NULL)
3231 return -EMSGSIZE;
3232
3233 pol_id = nlmsg_data(nlh);
3234 /* copy data from selector, dir, and type to the pol_id */
3235 memset(pol_id, 0, sizeof(*pol_id));
3236 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
3237 pol_id->dir = dir;
3238
3239 if (k != NULL) {
3240 err = copy_to_user_kmaddress(k, skb);
3241 if (err)
3242 goto out_cancel;
3243 }
3244 if (encap) {
3245 err = nla_put(skb, XFRMA_ENCAP, sizeof(*encap), encap);
3246 if (err)
3247 goto out_cancel;
3248 }
3249 err = copy_to_user_policy_type(type, skb);
3250 if (err)
3251 goto out_cancel;
3252 for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
3253 err = copy_to_user_migrate(mp, skb);
3254 if (err)
3255 goto out_cancel;
3256 }
3257
3258 nlmsg_end(skb, nlh);
3259 return 0;
3260
3261 out_cancel:
3262 nlmsg_cancel(skb, nlh);
3263 return err;
3264 }
3265
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)3266 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3267 const struct xfrm_migrate *m, int num_migrate,
3268 const struct xfrm_kmaddress *k,
3269 const struct xfrm_encap_tmpl *encap)
3270 {
3271 struct net *net = &init_net;
3272 struct sk_buff *skb;
3273 int err;
3274
3275 skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k, !!encap),
3276 GFP_ATOMIC);
3277 if (skb == NULL)
3278 return -ENOMEM;
3279
3280 /* build migrate */
3281 err = build_migrate(skb, m, num_migrate, k, sel, encap, dir, type);
3282 BUG_ON(err < 0);
3283
3284 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MIGRATE);
3285 }
3286 #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)3287 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3288 const struct xfrm_migrate *m, int num_migrate,
3289 const struct xfrm_kmaddress *k,
3290 const struct xfrm_encap_tmpl *encap)
3291 {
3292 return -ENOPROTOOPT;
3293 }
3294 #endif
3295
3296 #define XMSGSIZE(type) sizeof(struct type)
3297
3298 const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
3299 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
3300 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
3301 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
3302 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
3303 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
3304 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
3305 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
3306 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
3307 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
3308 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
3309 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
3310 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
3311 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
3312 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0,
3313 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
3314 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
3315 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
3316 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
3317 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32),
3318 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
3319 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
3320 [XFRM_MSG_SETDEFAULT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_default),
3321 [XFRM_MSG_GETDEFAULT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_default),
3322 };
3323 EXPORT_SYMBOL_GPL(xfrm_msg_min);
3324
3325 #undef XMSGSIZE
3326
3327 const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
3328 [XFRMA_UNSPEC] = { .strict_start_type = XFRMA_SA_DIR },
3329 [XFRMA_SA] = { .len = sizeof(struct xfrm_usersa_info)},
3330 [XFRMA_POLICY] = { .len = sizeof(struct xfrm_userpolicy_info)},
3331 [XFRMA_LASTUSED] = { .type = NLA_U64},
3332 [XFRMA_ALG_AUTH_TRUNC] = { .len = sizeof(struct xfrm_algo_auth)},
3333 [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) },
3334 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) },
3335 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) },
3336 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) },
3337 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) },
3338 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) },
3339 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_user_sec_ctx) },
3340 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) },
3341 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) },
3342 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 },
3343 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 },
3344 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) },
3345 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) },
3346 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)},
3347 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) },
3348 [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) },
3349 [XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) },
3350 [XFRMA_TFCPAD] = { .type = NLA_U32 },
3351 [XFRMA_REPLAY_ESN_VAL] = { .len = sizeof(struct xfrm_replay_state_esn) },
3352 [XFRMA_SA_EXTRA_FLAGS] = { .type = NLA_U32 },
3353 [XFRMA_PROTO] = { .type = NLA_U8 },
3354 [XFRMA_ADDRESS_FILTER] = { .len = sizeof(struct xfrm_address_filter) },
3355 [XFRMA_OFFLOAD_DEV] = { .len = sizeof(struct xfrm_user_offload) },
3356 [XFRMA_SET_MARK] = { .type = NLA_U32 },
3357 [XFRMA_SET_MARK_MASK] = { .type = NLA_U32 },
3358 [XFRMA_IF_ID] = { .type = NLA_U32 },
3359 [XFRMA_MTIMER_THRESH] = { .type = NLA_U32 },
3360 [XFRMA_SA_DIR] = NLA_POLICY_RANGE(NLA_U8, XFRM_SA_DIR_IN, XFRM_SA_DIR_OUT),
3361 [XFRMA_NAT_KEEPALIVE_INTERVAL] = { .type = NLA_U32 },
3362 [XFRMA_SA_PCPU] = { .type = NLA_U32 },
3363 [XFRMA_IPTFS_DROP_TIME] = { .type = NLA_U32 },
3364 [XFRMA_IPTFS_REORDER_WINDOW] = { .type = NLA_U16 },
3365 [XFRMA_IPTFS_DONT_FRAG] = { .type = NLA_FLAG },
3366 [XFRMA_IPTFS_INIT_DELAY] = { .type = NLA_U32 },
3367 [XFRMA_IPTFS_MAX_QSIZE] = { .type = NLA_U32 },
3368 [XFRMA_IPTFS_PKT_SIZE] = { .type = NLA_U32 },
3369 };
3370 EXPORT_SYMBOL_GPL(xfrma_policy);
3371
3372 static const struct nla_policy xfrma_spd_policy[XFRMA_SPD_MAX+1] = {
3373 [XFRMA_SPD_IPV4_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
3374 [XFRMA_SPD_IPV6_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
3375 };
3376
3377 static const struct xfrm_link {
3378 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **,
3379 struct netlink_ext_ack *);
3380 int (*start)(struct netlink_callback *);
3381 int (*dump)(struct sk_buff *, struct netlink_callback *);
3382 int (*done)(struct netlink_callback *);
3383 const struct nla_policy *nla_pol;
3384 int nla_max;
3385 } xfrm_dispatch[XFRM_NR_MSGTYPES] = {
3386 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
3387 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa },
3388 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
3389 .dump = xfrm_dump_sa,
3390 .done = xfrm_dump_sa_done },
3391 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
3392 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy },
3393 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
3394 .start = xfrm_dump_policy_start,
3395 .dump = xfrm_dump_policy,
3396 .done = xfrm_dump_policy_done },
3397 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
3398 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire },
3399 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
3400 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
3401 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
3402 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
3403 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa },
3404 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy },
3405 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae },
3406 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae },
3407 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate },
3408 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo },
3409 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_set_spdinfo,
3410 .nla_pol = xfrma_spd_policy,
3411 .nla_max = XFRMA_SPD_MAX },
3412 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo },
3413 [XFRM_MSG_SETDEFAULT - XFRM_MSG_BASE] = { .doit = xfrm_set_default },
3414 [XFRM_MSG_GETDEFAULT - XFRM_MSG_BASE] = { .doit = xfrm_get_default },
3415 };
3416
xfrm_reject_unused_attr(int type,struct nlattr ** attrs,struct netlink_ext_ack * extack)3417 static int xfrm_reject_unused_attr(int type, struct nlattr **attrs,
3418 struct netlink_ext_ack *extack)
3419 {
3420 if (attrs[XFRMA_SA_DIR]) {
3421 switch (type) {
3422 case XFRM_MSG_NEWSA:
3423 case XFRM_MSG_UPDSA:
3424 case XFRM_MSG_ALLOCSPI:
3425 break;
3426 default:
3427 NL_SET_ERR_MSG(extack, "Invalid attribute SA_DIR");
3428 return -EINVAL;
3429 }
3430 }
3431
3432 if (attrs[XFRMA_SA_PCPU]) {
3433 switch (type) {
3434 case XFRM_MSG_NEWSA:
3435 case XFRM_MSG_UPDSA:
3436 case XFRM_MSG_ALLOCSPI:
3437 case XFRM_MSG_ACQUIRE:
3438
3439 break;
3440 default:
3441 NL_SET_ERR_MSG(extack, "Invalid attribute SA_PCPU");
3442 return -EINVAL;
3443 }
3444 }
3445
3446 return 0;
3447 }
3448
xfrm_user_rcv_msg(struct sk_buff * skb,struct nlmsghdr * nlh,struct netlink_ext_ack * extack)3449 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
3450 struct netlink_ext_ack *extack)
3451 {
3452 struct net *net = sock_net(skb->sk);
3453 struct nlattr *attrs[XFRMA_MAX+1];
3454 const struct xfrm_link *link;
3455 struct nlmsghdr *nlh64 = NULL;
3456 int type, err;
3457
3458 type = nlh->nlmsg_type;
3459 if (type > XFRM_MSG_MAX)
3460 return -EINVAL;
3461
3462 type -= XFRM_MSG_BASE;
3463 link = &xfrm_dispatch[type];
3464
3465 /* All operations require privileges, even GET */
3466 if (!netlink_net_capable(skb, CAP_NET_ADMIN))
3467 return -EPERM;
3468
3469 if (in_compat_syscall()) {
3470 struct xfrm_translator *xtr = xfrm_get_translator();
3471
3472 if (!xtr)
3473 return -EOPNOTSUPP;
3474
3475 nlh64 = xtr->rcv_msg_compat(nlh, link->nla_max,
3476 link->nla_pol, extack);
3477 xfrm_put_translator(xtr);
3478 if (IS_ERR(nlh64))
3479 return PTR_ERR(nlh64);
3480 if (nlh64)
3481 nlh = nlh64;
3482 }
3483
3484 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
3485 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
3486 (nlh->nlmsg_flags & NLM_F_DUMP)) {
3487 struct netlink_dump_control c = {
3488 .start = link->start,
3489 .dump = link->dump,
3490 .done = link->done,
3491 };
3492
3493 if (link->dump == NULL) {
3494 err = -EINVAL;
3495 goto err;
3496 }
3497
3498 err = netlink_dump_start(xfrm_net_nlsk(net, skb), skb, nlh, &c);
3499 goto err;
3500 }
3501
3502 err = nlmsg_parse_deprecated(nlh, xfrm_msg_min[type], attrs,
3503 link->nla_max ? : XFRMA_MAX,
3504 link->nla_pol ? : xfrma_policy, extack);
3505 if (err < 0)
3506 goto err;
3507
3508 if (!link->nla_pol || link->nla_pol == xfrma_policy) {
3509 err = xfrm_reject_unused_attr((type + XFRM_MSG_BASE), attrs, extack);
3510 if (err < 0)
3511 goto err;
3512 }
3513
3514 if (link->doit == NULL) {
3515 err = -EINVAL;
3516 goto err;
3517 }
3518
3519 err = link->doit(skb, nlh, attrs, extack);
3520
3521 /* We need to free skb allocated in xfrm_alloc_compat() before
3522 * returning from this function, because consume_skb() won't take
3523 * care of frag_list since netlink destructor sets
3524 * sbk->head to NULL. (see netlink_skb_destructor())
3525 */
3526 if (skb_has_frag_list(skb)) {
3527 kfree_skb(skb_shinfo(skb)->frag_list);
3528 skb_shinfo(skb)->frag_list = NULL;
3529 }
3530
3531 err:
3532 kvfree(nlh64);
3533 return err;
3534 }
3535
xfrm_netlink_rcv(struct sk_buff * skb)3536 static void xfrm_netlink_rcv(struct sk_buff *skb)
3537 {
3538 struct net *net = sock_net(skb->sk);
3539
3540 mutex_lock(&net->xfrm.xfrm_cfg_mutex);
3541 netlink_rcv_skb(skb, &xfrm_user_rcv_msg);
3542 mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
3543 }
3544
xfrm_expire_msgsize(void)3545 static inline unsigned int xfrm_expire_msgsize(void)
3546 {
3547 return NLMSG_ALIGN(sizeof(struct xfrm_user_expire)) +
3548 nla_total_size(sizeof(struct xfrm_mark)) +
3549 nla_total_size(sizeof_field(struct xfrm_state, dir)) +
3550 nla_total_size(4); /* XFRMA_SA_PCPU */
3551 }
3552
build_expire(struct sk_buff * skb,struct xfrm_state * x,const struct km_event * c)3553 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
3554 {
3555 struct xfrm_user_expire *ue;
3556 struct nlmsghdr *nlh;
3557 int err;
3558
3559 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0);
3560 if (nlh == NULL)
3561 return -EMSGSIZE;
3562
3563 ue = nlmsg_data(nlh);
3564 copy_to_user_state(x, &ue->state);
3565 ue->hard = (c->data.hard != 0) ? 1 : 0;
3566 /* clear the padding bytes */
3567 memset_after(ue, 0, hard);
3568
3569 err = xfrm_mark_put(skb, &x->mark);
3570 if (err)
3571 return err;
3572
3573 err = xfrm_if_id_put(skb, x->if_id);
3574 if (err)
3575 return err;
3576 if (x->pcpu_num != UINT_MAX) {
3577 err = nla_put_u32(skb, XFRMA_SA_PCPU, x->pcpu_num);
3578 if (err)
3579 return err;
3580 }
3581
3582 if (x->dir) {
3583 err = nla_put_u8(skb, XFRMA_SA_DIR, x->dir);
3584 if (err)
3585 return err;
3586 }
3587
3588 nlmsg_end(skb, nlh);
3589 return 0;
3590 }
3591
xfrm_exp_state_notify(struct xfrm_state * x,const struct km_event * c)3592 static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c)
3593 {
3594 struct net *net = xs_net(x);
3595 struct sk_buff *skb;
3596
3597 skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC);
3598 if (skb == NULL)
3599 return -ENOMEM;
3600
3601 if (build_expire(skb, x, c) < 0) {
3602 kfree_skb(skb);
3603 return -EMSGSIZE;
3604 }
3605
3606 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
3607 }
3608
xfrm_aevent_state_notify(struct xfrm_state * x,const struct km_event * c)3609 static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c)
3610 {
3611 struct net *net = xs_net(x);
3612 struct sk_buff *skb;
3613 int err;
3614
3615 skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
3616 if (skb == NULL)
3617 return -ENOMEM;
3618
3619 err = build_aevent(skb, x, c);
3620 BUG_ON(err < 0);
3621
3622 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_AEVENTS);
3623 }
3624
xfrm_notify_sa_flush(const struct km_event * c)3625 static int xfrm_notify_sa_flush(const struct km_event *c)
3626 {
3627 struct net *net = c->net;
3628 struct xfrm_usersa_flush *p;
3629 struct nlmsghdr *nlh;
3630 struct sk_buff *skb;
3631 int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush));
3632
3633 skb = nlmsg_new(len, GFP_ATOMIC);
3634 if (skb == NULL)
3635 return -ENOMEM;
3636
3637 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0);
3638 if (nlh == NULL) {
3639 kfree_skb(skb);
3640 return -EMSGSIZE;
3641 }
3642
3643 p = nlmsg_data(nlh);
3644 p->proto = c->data.proto;
3645
3646 nlmsg_end(skb, nlh);
3647
3648 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
3649 }
3650
xfrm_sa_len(struct xfrm_state * x)3651 static inline unsigned int xfrm_sa_len(struct xfrm_state *x)
3652 {
3653 unsigned int l = 0;
3654 if (x->aead)
3655 l += nla_total_size(aead_len(x->aead));
3656 if (x->aalg) {
3657 l += nla_total_size(sizeof(struct xfrm_algo) +
3658 (x->aalg->alg_key_len + 7) / 8);
3659 l += nla_total_size(xfrm_alg_auth_len(x->aalg));
3660 }
3661 if (x->ealg)
3662 l += nla_total_size(xfrm_alg_len(x->ealg));
3663 if (x->calg)
3664 l += nla_total_size(sizeof(*x->calg));
3665 if (x->encap)
3666 l += nla_total_size(sizeof(*x->encap));
3667 if (x->tfcpad)
3668 l += nla_total_size(sizeof(x->tfcpad));
3669 if (x->replay_esn)
3670 l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn));
3671 else
3672 l += nla_total_size(sizeof(struct xfrm_replay_state));
3673 if (x->security)
3674 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) +
3675 x->security->ctx_len);
3676 if (x->coaddr)
3677 l += nla_total_size(sizeof(*x->coaddr));
3678 if (x->props.extra_flags)
3679 l += nla_total_size(sizeof(x->props.extra_flags));
3680 if (x->xso.dev)
3681 l += nla_total_size(sizeof(struct xfrm_user_offload));
3682 if (x->props.smark.v | x->props.smark.m) {
3683 l += nla_total_size(sizeof(x->props.smark.v));
3684 l += nla_total_size(sizeof(x->props.smark.m));
3685 }
3686 if (x->if_id)
3687 l += nla_total_size(sizeof(x->if_id));
3688 if (x->pcpu_num != UINT_MAX)
3689 l += nla_total_size(sizeof(x->pcpu_num));
3690
3691 /* Must count x->lastused as it may become non-zero behind our back. */
3692 l += nla_total_size_64bit(sizeof(u64));
3693
3694 if (x->mapping_maxage)
3695 l += nla_total_size(sizeof(x->mapping_maxage));
3696
3697 if (x->dir)
3698 l += nla_total_size(sizeof(x->dir));
3699
3700 if (x->nat_keepalive_interval)
3701 l += nla_total_size(sizeof(x->nat_keepalive_interval));
3702
3703 if (x->mode_cbs && x->mode_cbs->sa_len)
3704 l += x->mode_cbs->sa_len(x);
3705
3706 return l;
3707 }
3708
xfrm_notify_sa(struct xfrm_state * x,const struct km_event * c)3709 static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c)
3710 {
3711 struct net *net = xs_net(x);
3712 struct xfrm_usersa_info *p;
3713 struct xfrm_usersa_id *id;
3714 struct nlmsghdr *nlh;
3715 struct sk_buff *skb;
3716 unsigned int len = xfrm_sa_len(x);
3717 unsigned int headlen;
3718 int err;
3719
3720 headlen = sizeof(*p);
3721 if (c->event == XFRM_MSG_DELSA) {
3722 len += nla_total_size(headlen);
3723 headlen = sizeof(*id);
3724 len += nla_total_size(sizeof(struct xfrm_mark));
3725 }
3726 len += NLMSG_ALIGN(headlen);
3727
3728 skb = nlmsg_new(len, GFP_ATOMIC);
3729 if (skb == NULL)
3730 return -ENOMEM;
3731
3732 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
3733 err = -EMSGSIZE;
3734 if (nlh == NULL)
3735 goto out_free_skb;
3736
3737 p = nlmsg_data(nlh);
3738 if (c->event == XFRM_MSG_DELSA) {
3739 struct nlattr *attr;
3740
3741 id = nlmsg_data(nlh);
3742 memset(id, 0, sizeof(*id));
3743 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
3744 id->spi = x->id.spi;
3745 id->family = x->props.family;
3746 id->proto = x->id.proto;
3747
3748 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p));
3749 err = -EMSGSIZE;
3750 if (attr == NULL)
3751 goto out_free_skb;
3752
3753 p = nla_data(attr);
3754 }
3755 err = copy_to_user_state_extra(x, p, skb);
3756 if (err)
3757 goto out_free_skb;
3758
3759 nlmsg_end(skb, nlh);
3760
3761 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
3762
3763 out_free_skb:
3764 kfree_skb(skb);
3765 return err;
3766 }
3767
xfrm_send_state_notify(struct xfrm_state * x,const struct km_event * c)3768 static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c)
3769 {
3770
3771 switch (c->event) {
3772 case XFRM_MSG_EXPIRE:
3773 return xfrm_exp_state_notify(x, c);
3774 case XFRM_MSG_NEWAE:
3775 return xfrm_aevent_state_notify(x, c);
3776 case XFRM_MSG_DELSA:
3777 case XFRM_MSG_UPDSA:
3778 case XFRM_MSG_NEWSA:
3779 return xfrm_notify_sa(x, c);
3780 case XFRM_MSG_FLUSHSA:
3781 return xfrm_notify_sa_flush(c);
3782 default:
3783 printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n",
3784 c->event);
3785 break;
3786 }
3787
3788 return 0;
3789
3790 }
3791
xfrm_acquire_msgsize(struct xfrm_state * x,struct xfrm_policy * xp)3792 static inline unsigned int xfrm_acquire_msgsize(struct xfrm_state *x,
3793 struct xfrm_policy *xp)
3794 {
3795 return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire))
3796 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
3797 + nla_total_size(sizeof(struct xfrm_mark))
3798 + nla_total_size(xfrm_user_sec_ctx_size(x->security))
3799 + nla_total_size(4) /* XFRMA_SA_PCPU */
3800 + userpolicy_type_attrsize();
3801 }
3802
build_acquire(struct sk_buff * skb,struct xfrm_state * x,struct xfrm_tmpl * xt,struct xfrm_policy * xp)3803 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
3804 struct xfrm_tmpl *xt, struct xfrm_policy *xp)
3805 {
3806 __u32 seq = xfrm_get_acqseq();
3807 struct xfrm_user_acquire *ua;
3808 struct nlmsghdr *nlh;
3809 int err;
3810
3811 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0);
3812 if (nlh == NULL)
3813 return -EMSGSIZE;
3814
3815 ua = nlmsg_data(nlh);
3816 memcpy(&ua->id, &x->id, sizeof(ua->id));
3817 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
3818 memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
3819 copy_to_user_policy(xp, &ua->policy, XFRM_POLICY_OUT);
3820 ua->aalgos = xt->aalgos;
3821 ua->ealgos = xt->ealgos;
3822 ua->calgos = xt->calgos;
3823 ua->seq = x->km.seq = seq;
3824
3825 err = copy_to_user_tmpl(xp, skb);
3826 if (!err)
3827 err = copy_to_user_state_sec_ctx(x, skb);
3828 if (!err)
3829 err = copy_to_user_policy_type(xp->type, skb);
3830 if (!err)
3831 err = xfrm_mark_put(skb, &xp->mark);
3832 if (!err)
3833 err = xfrm_if_id_put(skb, xp->if_id);
3834 if (!err && xp->xdo.dev)
3835 err = copy_user_offload(&xp->xdo, skb);
3836 if (!err && x->pcpu_num != UINT_MAX)
3837 err = nla_put_u32(skb, XFRMA_SA_PCPU, x->pcpu_num);
3838 if (err) {
3839 nlmsg_cancel(skb, nlh);
3840 return err;
3841 }
3842
3843 nlmsg_end(skb, nlh);
3844 return 0;
3845 }
3846
xfrm_send_acquire(struct xfrm_state * x,struct xfrm_tmpl * xt,struct xfrm_policy * xp)3847 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
3848 struct xfrm_policy *xp)
3849 {
3850 struct net *net = xs_net(x);
3851 struct sk_buff *skb;
3852 int err;
3853
3854 skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC);
3855 if (skb == NULL)
3856 return -ENOMEM;
3857
3858 err = build_acquire(skb, x, xt, xp);
3859 BUG_ON(err < 0);
3860
3861 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_ACQUIRE);
3862 }
3863
3864 /* User gives us xfrm_user_policy_info followed by an array of 0
3865 * or more templates.
3866 */
xfrm_compile_policy(struct sock * sk,int opt,u8 * data,int len,int * dir)3867 static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
3868 u8 *data, int len, int *dir)
3869 {
3870 struct net *net = sock_net(sk);
3871 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
3872 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
3873 struct xfrm_policy *xp;
3874 int nr;
3875
3876 switch (sk->sk_family) {
3877 case AF_INET:
3878 if (opt != IP_XFRM_POLICY) {
3879 *dir = -EOPNOTSUPP;
3880 return NULL;
3881 }
3882 break;
3883 #if IS_ENABLED(CONFIG_IPV6)
3884 case AF_INET6:
3885 if (opt != IPV6_XFRM_POLICY) {
3886 *dir = -EOPNOTSUPP;
3887 return NULL;
3888 }
3889 break;
3890 #endif
3891 default:
3892 *dir = -EINVAL;
3893 return NULL;
3894 }
3895
3896 *dir = -EINVAL;
3897
3898 if (len < sizeof(*p) ||
3899 verify_newpolicy_info(p, NULL))
3900 return NULL;
3901
3902 nr = ((len - sizeof(*p)) / sizeof(*ut));
3903 if (validate_tmpl(nr, ut, p->sel.family, p->dir, NULL))
3904 return NULL;
3905
3906 if (p->dir > XFRM_POLICY_OUT)
3907 return NULL;
3908
3909 xp = xfrm_policy_alloc(net, GFP_ATOMIC);
3910 if (xp == NULL) {
3911 *dir = -ENOBUFS;
3912 return NULL;
3913 }
3914
3915 copy_from_user_policy(xp, p);
3916 xp->type = XFRM_POLICY_TYPE_MAIN;
3917 copy_templates(xp, ut, nr);
3918
3919 *dir = p->dir;
3920
3921 return xp;
3922 }
3923
xfrm_polexpire_msgsize(struct xfrm_policy * xp)3924 static inline unsigned int xfrm_polexpire_msgsize(struct xfrm_policy *xp)
3925 {
3926 return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire))
3927 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
3928 + nla_total_size(xfrm_user_sec_ctx_size(xp->security))
3929 + nla_total_size(sizeof(struct xfrm_mark))
3930 + userpolicy_type_attrsize();
3931 }
3932
build_polexpire(struct sk_buff * skb,struct xfrm_policy * xp,int dir,const struct km_event * c)3933 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
3934 int dir, const struct km_event *c)
3935 {
3936 struct xfrm_user_polexpire *upe;
3937 int hard = c->data.hard;
3938 struct nlmsghdr *nlh;
3939 int err;
3940
3941 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0);
3942 if (nlh == NULL)
3943 return -EMSGSIZE;
3944
3945 upe = nlmsg_data(nlh);
3946 copy_to_user_policy(xp, &upe->pol, dir);
3947 err = copy_to_user_tmpl(xp, skb);
3948 if (!err)
3949 err = copy_to_user_sec_ctx(xp, skb);
3950 if (!err)
3951 err = copy_to_user_policy_type(xp->type, skb);
3952 if (!err)
3953 err = xfrm_mark_put(skb, &xp->mark);
3954 if (!err)
3955 err = xfrm_if_id_put(skb, xp->if_id);
3956 if (!err && xp->xdo.dev)
3957 err = copy_user_offload(&xp->xdo, skb);
3958 if (err) {
3959 nlmsg_cancel(skb, nlh);
3960 return err;
3961 }
3962 upe->hard = !!hard;
3963
3964 nlmsg_end(skb, nlh);
3965 return 0;
3966 }
3967
xfrm_exp_policy_notify(struct xfrm_policy * xp,int dir,const struct km_event * c)3968 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3969 {
3970 struct net *net = xp_net(xp);
3971 struct sk_buff *skb;
3972 int err;
3973
3974 skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC);
3975 if (skb == NULL)
3976 return -ENOMEM;
3977
3978 err = build_polexpire(skb, xp, dir, c);
3979 BUG_ON(err < 0);
3980
3981 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
3982 }
3983
xfrm_notify_policy(struct xfrm_policy * xp,int dir,const struct km_event * c)3984 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
3985 {
3986 unsigned int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
3987 struct net *net = xp_net(xp);
3988 struct xfrm_userpolicy_info *p;
3989 struct xfrm_userpolicy_id *id;
3990 struct nlmsghdr *nlh;
3991 struct sk_buff *skb;
3992 unsigned int headlen;
3993 int err;
3994
3995 headlen = sizeof(*p);
3996 if (c->event == XFRM_MSG_DELPOLICY) {
3997 len += nla_total_size(headlen);
3998 headlen = sizeof(*id);
3999 }
4000 len += userpolicy_type_attrsize();
4001 len += nla_total_size(sizeof(struct xfrm_mark));
4002 len += NLMSG_ALIGN(headlen);
4003
4004 skb = nlmsg_new(len, GFP_ATOMIC);
4005 if (skb == NULL)
4006 return -ENOMEM;
4007
4008 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
4009 err = -EMSGSIZE;
4010 if (nlh == NULL)
4011 goto out_free_skb;
4012
4013 p = nlmsg_data(nlh);
4014 if (c->event == XFRM_MSG_DELPOLICY) {
4015 struct nlattr *attr;
4016
4017 id = nlmsg_data(nlh);
4018 memset(id, 0, sizeof(*id));
4019 id->dir = dir;
4020 if (c->data.byid)
4021 id->index = xp->index;
4022 else
4023 memcpy(&id->sel, &xp->selector, sizeof(id->sel));
4024
4025 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p));
4026 err = -EMSGSIZE;
4027 if (attr == NULL)
4028 goto out_free_skb;
4029
4030 p = nla_data(attr);
4031 }
4032
4033 copy_to_user_policy(xp, p, dir);
4034 err = copy_to_user_tmpl(xp, skb);
4035 if (!err)
4036 err = copy_to_user_policy_type(xp->type, skb);
4037 if (!err)
4038 err = xfrm_mark_put(skb, &xp->mark);
4039 if (!err)
4040 err = xfrm_if_id_put(skb, xp->if_id);
4041 if (!err && xp->xdo.dev)
4042 err = copy_user_offload(&xp->xdo, skb);
4043 if (err)
4044 goto out_free_skb;
4045
4046 nlmsg_end(skb, nlh);
4047
4048 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
4049
4050 out_free_skb:
4051 kfree_skb(skb);
4052 return err;
4053 }
4054
xfrm_notify_policy_flush(const struct km_event * c)4055 static int xfrm_notify_policy_flush(const struct km_event *c)
4056 {
4057 struct net *net = c->net;
4058 struct nlmsghdr *nlh;
4059 struct sk_buff *skb;
4060 int err;
4061
4062 skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC);
4063 if (skb == NULL)
4064 return -ENOMEM;
4065
4066 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0);
4067 err = -EMSGSIZE;
4068 if (nlh == NULL)
4069 goto out_free_skb;
4070 err = copy_to_user_policy_type(c->data.type, skb);
4071 if (err)
4072 goto out_free_skb;
4073
4074 nlmsg_end(skb, nlh);
4075
4076 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
4077
4078 out_free_skb:
4079 kfree_skb(skb);
4080 return err;
4081 }
4082
xfrm_send_policy_notify(struct xfrm_policy * xp,int dir,const struct km_event * c)4083 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
4084 {
4085
4086 switch (c->event) {
4087 case XFRM_MSG_NEWPOLICY:
4088 case XFRM_MSG_UPDPOLICY:
4089 case XFRM_MSG_DELPOLICY:
4090 return xfrm_notify_policy(xp, dir, c);
4091 case XFRM_MSG_FLUSHPOLICY:
4092 return xfrm_notify_policy_flush(c);
4093 case XFRM_MSG_POLEXPIRE:
4094 return xfrm_exp_policy_notify(xp, dir, c);
4095 default:
4096 printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n",
4097 c->event);
4098 }
4099
4100 return 0;
4101
4102 }
4103
xfrm_report_msgsize(void)4104 static inline unsigned int xfrm_report_msgsize(void)
4105 {
4106 return NLMSG_ALIGN(sizeof(struct xfrm_user_report));
4107 }
4108
build_report(struct sk_buff * skb,u8 proto,struct xfrm_selector * sel,xfrm_address_t * addr)4109 static int build_report(struct sk_buff *skb, u8 proto,
4110 struct xfrm_selector *sel, xfrm_address_t *addr)
4111 {
4112 struct xfrm_user_report *ur;
4113 struct nlmsghdr *nlh;
4114
4115 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0);
4116 if (nlh == NULL)
4117 return -EMSGSIZE;
4118
4119 ur = nlmsg_data(nlh);
4120 ur->proto = proto;
4121 memcpy(&ur->sel, sel, sizeof(ur->sel));
4122
4123 if (addr) {
4124 int err = nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr);
4125 if (err) {
4126 nlmsg_cancel(skb, nlh);
4127 return err;
4128 }
4129 }
4130 nlmsg_end(skb, nlh);
4131 return 0;
4132 }
4133
xfrm_send_report(struct net * net,u8 proto,struct xfrm_selector * sel,xfrm_address_t * addr)4134 static int xfrm_send_report(struct net *net, u8 proto,
4135 struct xfrm_selector *sel, xfrm_address_t *addr)
4136 {
4137 struct sk_buff *skb;
4138 int err;
4139
4140 skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC);
4141 if (skb == NULL)
4142 return -ENOMEM;
4143
4144 err = build_report(skb, proto, sel, addr);
4145 BUG_ON(err < 0);
4146
4147 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_REPORT);
4148 }
4149
xfrm_mapping_msgsize(void)4150 static inline unsigned int xfrm_mapping_msgsize(void)
4151 {
4152 return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping));
4153 }
4154
build_mapping(struct sk_buff * skb,struct xfrm_state * x,xfrm_address_t * new_saddr,__be16 new_sport)4155 static int build_mapping(struct sk_buff *skb, struct xfrm_state *x,
4156 xfrm_address_t *new_saddr, __be16 new_sport)
4157 {
4158 struct xfrm_user_mapping *um;
4159 struct nlmsghdr *nlh;
4160
4161 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0);
4162 if (nlh == NULL)
4163 return -EMSGSIZE;
4164
4165 um = nlmsg_data(nlh);
4166
4167 memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr));
4168 um->id.spi = x->id.spi;
4169 um->id.family = x->props.family;
4170 um->id.proto = x->id.proto;
4171 memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr));
4172 memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr));
4173 um->new_sport = new_sport;
4174 um->old_sport = x->encap->encap_sport;
4175 um->reqid = x->props.reqid;
4176
4177 nlmsg_end(skb, nlh);
4178 return 0;
4179 }
4180
xfrm_send_mapping(struct xfrm_state * x,xfrm_address_t * ipaddr,__be16 sport)4181 static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr,
4182 __be16 sport)
4183 {
4184 struct net *net = xs_net(x);
4185 struct sk_buff *skb;
4186 int err;
4187
4188 if (x->id.proto != IPPROTO_ESP)
4189 return -EINVAL;
4190
4191 if (!x->encap)
4192 return -EINVAL;
4193
4194 skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC);
4195 if (skb == NULL)
4196 return -ENOMEM;
4197
4198 err = build_mapping(skb, x, ipaddr, sport);
4199 BUG_ON(err < 0);
4200
4201 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MAPPING);
4202 }
4203
xfrm_is_alive(const struct km_event * c)4204 static bool xfrm_is_alive(const struct km_event *c)
4205 {
4206 return (bool)xfrm_acquire_is_on(c->net);
4207 }
4208
4209 static struct xfrm_mgr netlink_mgr = {
4210 .notify = xfrm_send_state_notify,
4211 .acquire = xfrm_send_acquire,
4212 .compile_policy = xfrm_compile_policy,
4213 .notify_policy = xfrm_send_policy_notify,
4214 .report = xfrm_send_report,
4215 .migrate = xfrm_send_migrate,
4216 .new_mapping = xfrm_send_mapping,
4217 .is_alive = xfrm_is_alive,
4218 };
4219
xfrm_user_net_init(struct net * net)4220 static int __net_init xfrm_user_net_init(struct net *net)
4221 {
4222 struct sock *nlsk;
4223 struct netlink_kernel_cfg cfg = {
4224 .groups = XFRMNLGRP_MAX,
4225 .input = xfrm_netlink_rcv,
4226 };
4227
4228 nlsk = netlink_kernel_create(net, NETLINK_XFRM, &cfg);
4229 if (nlsk == NULL)
4230 return -ENOMEM;
4231 net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */
4232 rcu_assign_pointer(net->xfrm.nlsk, nlsk);
4233 return 0;
4234 }
4235
xfrm_user_net_pre_exit(struct net * net)4236 static void __net_exit xfrm_user_net_pre_exit(struct net *net)
4237 {
4238 RCU_INIT_POINTER(net->xfrm.nlsk, NULL);
4239 }
4240
xfrm_user_net_exit(struct list_head * net_exit_list)4241 static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list)
4242 {
4243 struct net *net;
4244
4245 list_for_each_entry(net, net_exit_list, exit_list)
4246 netlink_kernel_release(net->xfrm.nlsk_stash);
4247 }
4248
4249 static struct pernet_operations xfrm_user_net_ops = {
4250 .init = xfrm_user_net_init,
4251 .pre_exit = xfrm_user_net_pre_exit,
4252 .exit_batch = xfrm_user_net_exit,
4253 };
4254
xfrm_user_init(void)4255 static int __init xfrm_user_init(void)
4256 {
4257 int rv;
4258
4259 printk(KERN_INFO "Initializing XFRM netlink socket\n");
4260
4261 rv = register_pernet_subsys(&xfrm_user_net_ops);
4262 if (rv < 0)
4263 return rv;
4264 xfrm_register_km(&netlink_mgr);
4265 return 0;
4266 }
4267
xfrm_user_exit(void)4268 static void __exit xfrm_user_exit(void)
4269 {
4270 xfrm_unregister_km(&netlink_mgr);
4271 unregister_pernet_subsys(&xfrm_user_net_ops);
4272 }
4273
4274 module_init(xfrm_user_init);
4275 module_exit(xfrm_user_exit);
4276 MODULE_DESCRIPTION("XFRM User interface");
4277 MODULE_LICENSE("GPL");
4278 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
4279