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