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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * XFRM compat layer
4 * Author: Dmitry Safonov <dima@arista.com>
5 * Based on code and translator idea by: Florian Westphal <fw@strlen.de>
6 */
7#include <linux/compat.h>
8#include <linux/nospec.h>
9#include <linux/xfrm.h>
10#include <net/xfrm.h>
11
12struct compat_xfrm_lifetime_cfg {
13 compat_u64 soft_byte_limit, hard_byte_limit;
14 compat_u64 soft_packet_limit, hard_packet_limit;
15 compat_u64 soft_add_expires_seconds, hard_add_expires_seconds;
16 compat_u64 soft_use_expires_seconds, hard_use_expires_seconds;
17}; /* same size on 32bit, but only 4 byte alignment required */
18
19struct compat_xfrm_lifetime_cur {
20 compat_u64 bytes, packets, add_time, use_time;
21}; /* same size on 32bit, but only 4 byte alignment required */
22
23struct compat_xfrm_userpolicy_info {
24 struct xfrm_selector sel;
25 struct compat_xfrm_lifetime_cfg lft;
26 struct compat_xfrm_lifetime_cur curlft;
27 __u32 priority, index;
28 u8 dir, action, flags, share;
29 /* 4 bytes additional padding on 64bit */
30};
31
32struct compat_xfrm_usersa_info {
33 struct xfrm_selector sel;
34 struct xfrm_id id;
35 xfrm_address_t saddr;
36 struct compat_xfrm_lifetime_cfg lft;
37 struct compat_xfrm_lifetime_cur curlft;
38 struct xfrm_stats stats;
39 __u32 seq, reqid;
40 u16 family;
41 u8 mode, replay_window, flags;
42 /* 4 bytes additional padding on 64bit */
43};
44
45struct compat_xfrm_user_acquire {
46 struct xfrm_id id;
47 xfrm_address_t saddr;
48 struct xfrm_selector sel;
49 struct compat_xfrm_userpolicy_info policy;
50 /* 4 bytes additional padding on 64bit */
51 __u32 aalgos, ealgos, calgos, seq;
52};
53
54struct compat_xfrm_userspi_info {
55 struct compat_xfrm_usersa_info info;
56 /* 4 bytes additional padding on 64bit */
57 __u32 min, max;
58};
59
60struct compat_xfrm_user_expire {
61 struct compat_xfrm_usersa_info state;
62 /* 8 bytes additional padding on 64bit */
63 u8 hard;
64};
65
66struct compat_xfrm_user_polexpire {
67 struct compat_xfrm_userpolicy_info pol;
68 /* 8 bytes additional padding on 64bit */
69 u8 hard;
70};
71
72#define XMSGSIZE(type) sizeof(struct type)
73
74static const int compat_msg_min[XFRM_NR_MSGTYPES] = {
75 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(compat_xfrm_usersa_info),
76 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
77 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
78 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(compat_xfrm_userpolicy_info),
79 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
80 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
81 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(compat_xfrm_userspi_info),
82 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(compat_xfrm_user_acquire),
83 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(compat_xfrm_user_expire),
84 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(compat_xfrm_userpolicy_info),
85 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(compat_xfrm_usersa_info),
86 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(compat_xfrm_user_polexpire),
87 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
88 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0,
89 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
90 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
91 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
92 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
93 [XFRM_MSG_NEWSADINFO - XFRM_MSG_BASE] = sizeof(u32),
94 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32),
95 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
96 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
97 [XFRM_MSG_MAPPING - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_mapping)
98};
99
100static const struct nla_policy compat_policy[XFRMA_MAX+1] = {
101 [XFRMA_SA] = { .len = XMSGSIZE(compat_xfrm_usersa_info)},
102 [XFRMA_POLICY] = { .len = XMSGSIZE(compat_xfrm_userpolicy_info)},
103 [XFRMA_LASTUSED] = { .type = NLA_U64},
104 [XFRMA_ALG_AUTH_TRUNC] = { .len = sizeof(struct xfrm_algo_auth)},
105 [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) },
106 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) },
107 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) },
108 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) },
109 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) },
110 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) },
111 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_user_sec_ctx) },
112 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) },
113 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) },
114 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 },
115 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 },
116 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) },
117 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) },
118 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)},
119 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) },
120 [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) },
121 [XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) },
122 [XFRMA_TFCPAD] = { .type = NLA_U32 },
123 [XFRMA_REPLAY_ESN_VAL] = { .len = sizeof(struct xfrm_replay_state_esn) },
124 [XFRMA_SA_EXTRA_FLAGS] = { .type = NLA_U32 },
125 [XFRMA_PROTO] = { .type = NLA_U8 },
126 [XFRMA_ADDRESS_FILTER] = { .len = sizeof(struct xfrm_address_filter) },
127 [XFRMA_OFFLOAD_DEV] = { .len = sizeof(struct xfrm_user_offload) },
128 [XFRMA_SET_MARK] = { .type = NLA_U32 },
129 [XFRMA_SET_MARK_MASK] = { .type = NLA_U32 },
130 [XFRMA_IF_ID] = { .type = NLA_U32 },
131 [XFRMA_MTIMER_THRESH] = { .type = NLA_U32 },
132};
133
134static struct nlmsghdr *xfrm_nlmsg_put_compat(struct sk_buff *skb,
135 const struct nlmsghdr *nlh_src, u16 type)
136{
137 int payload = compat_msg_min[type];
138 int src_len = xfrm_msg_min[type];
139 struct nlmsghdr *nlh_dst;
140
141 /* Compat messages are shorter or equal to native (+padding) */
142 if (WARN_ON_ONCE(src_len < payload))
143 return ERR_PTR(-EMSGSIZE);
144
145 nlh_dst = nlmsg_put(skb, nlh_src->nlmsg_pid, nlh_src->nlmsg_seq,
146 nlh_src->nlmsg_type, payload, nlh_src->nlmsg_flags);
147 if (!nlh_dst)
148 return ERR_PTR(-EMSGSIZE);
149
150 memset(nlmsg_data(nlh_dst), 0, payload);
151
152 switch (nlh_src->nlmsg_type) {
153 /* Compat message has the same layout as native */
154 case XFRM_MSG_DELSA:
155 case XFRM_MSG_DELPOLICY:
156 case XFRM_MSG_FLUSHSA:
157 case XFRM_MSG_FLUSHPOLICY:
158 case XFRM_MSG_NEWAE:
159 case XFRM_MSG_REPORT:
160 case XFRM_MSG_MIGRATE:
161 case XFRM_MSG_NEWSADINFO:
162 case XFRM_MSG_NEWSPDINFO:
163 case XFRM_MSG_MAPPING:
164 WARN_ON_ONCE(src_len != payload);
165 memcpy(nlmsg_data(nlh_dst), nlmsg_data(nlh_src), src_len);
166 break;
167 /* 4 byte alignment for trailing u64 on native, but not on compat */
168 case XFRM_MSG_NEWSA:
169 case XFRM_MSG_NEWPOLICY:
170 case XFRM_MSG_UPDSA:
171 case XFRM_MSG_UPDPOLICY:
172 WARN_ON_ONCE(src_len != payload + 4);
173 memcpy(nlmsg_data(nlh_dst), nlmsg_data(nlh_src), payload);
174 break;
175 case XFRM_MSG_EXPIRE: {
176 const struct xfrm_user_expire *src_ue = nlmsg_data(nlh_src);
177 struct compat_xfrm_user_expire *dst_ue = nlmsg_data(nlh_dst);
178
179 /* compat_xfrm_user_expire has 4-byte smaller state */
180 memcpy(dst_ue, src_ue, sizeof(dst_ue->state));
181 dst_ue->hard = src_ue->hard;
182 break;
183 }
184 case XFRM_MSG_ACQUIRE: {
185 const struct xfrm_user_acquire *src_ua = nlmsg_data(nlh_src);
186 struct compat_xfrm_user_acquire *dst_ua = nlmsg_data(nlh_dst);
187
188 memcpy(dst_ua, src_ua, offsetof(struct compat_xfrm_user_acquire, aalgos));
189 dst_ua->aalgos = src_ua->aalgos;
190 dst_ua->ealgos = src_ua->ealgos;
191 dst_ua->calgos = src_ua->calgos;
192 dst_ua->seq = src_ua->seq;
193 break;
194 }
195 case XFRM_MSG_POLEXPIRE: {
196 const struct xfrm_user_polexpire *src_upe = nlmsg_data(nlh_src);
197 struct compat_xfrm_user_polexpire *dst_upe = nlmsg_data(nlh_dst);
198
199 /* compat_xfrm_user_polexpire has 4-byte smaller state */
200 memcpy(dst_upe, src_upe, sizeof(dst_upe->pol));
201 dst_upe->hard = src_upe->hard;
202 break;
203 }
204 case XFRM_MSG_ALLOCSPI: {
205 const struct xfrm_userspi_info *src_usi = nlmsg_data(nlh_src);
206 struct compat_xfrm_userspi_info *dst_usi = nlmsg_data(nlh_dst);
207
208 /* compat_xfrm_user_polexpire has 4-byte smaller state */
209 memcpy(dst_usi, src_usi, sizeof(src_usi->info));
210 dst_usi->min = src_usi->min;
211 dst_usi->max = src_usi->max;
212 break;
213 }
214 /* Not being sent by kernel */
215 case XFRM_MSG_GETSA:
216 case XFRM_MSG_GETPOLICY:
217 case XFRM_MSG_GETAE:
218 case XFRM_MSG_GETSADINFO:
219 case XFRM_MSG_GETSPDINFO:
220 default:
221 pr_warn_once("unsupported nlmsg_type %d\n", nlh_src->nlmsg_type);
222 return ERR_PTR(-EOPNOTSUPP);
223 }
224
225 return nlh_dst;
226}
227
228static int xfrm_nla_cpy(struct sk_buff *dst, const struct nlattr *src, int len)
229{
230 return nla_put(dst, src->nla_type, len, nla_data(src));
231}
232
233static int xfrm_xlate64_attr(struct sk_buff *dst, const struct nlattr *src)
234{
235 switch (src->nla_type) {
236 case XFRMA_PAD:
237 /* Ignore */
238 return 0;
239 case XFRMA_UNSPEC:
240 case XFRMA_ALG_AUTH:
241 case XFRMA_ALG_CRYPT:
242 case XFRMA_ALG_COMP:
243 case XFRMA_ENCAP:
244 case XFRMA_TMPL:
245 return xfrm_nla_cpy(dst, src, nla_len(src));
246 case XFRMA_SA:
247 return xfrm_nla_cpy(dst, src, XMSGSIZE(compat_xfrm_usersa_info));
248 case XFRMA_POLICY:
249 return xfrm_nla_cpy(dst, src, XMSGSIZE(compat_xfrm_userpolicy_info));
250 case XFRMA_SEC_CTX:
251 return xfrm_nla_cpy(dst, src, nla_len(src));
252 case XFRMA_LTIME_VAL:
253 return nla_put_64bit(dst, src->nla_type, nla_len(src),
254 nla_data(src), XFRMA_PAD);
255 case XFRMA_REPLAY_VAL:
256 case XFRMA_REPLAY_THRESH:
257 case XFRMA_ETIMER_THRESH:
258 case XFRMA_SRCADDR:
259 case XFRMA_COADDR:
260 return xfrm_nla_cpy(dst, src, nla_len(src));
261 case XFRMA_LASTUSED:
262 return nla_put_64bit(dst, src->nla_type, nla_len(src),
263 nla_data(src), XFRMA_PAD);
264 case XFRMA_POLICY_TYPE:
265 case XFRMA_MIGRATE:
266 case XFRMA_ALG_AEAD:
267 case XFRMA_KMADDRESS:
268 case XFRMA_ALG_AUTH_TRUNC:
269 case XFRMA_MARK:
270 case XFRMA_TFCPAD:
271 case XFRMA_REPLAY_ESN_VAL:
272 case XFRMA_SA_EXTRA_FLAGS:
273 case XFRMA_PROTO:
274 case XFRMA_ADDRESS_FILTER:
275 case XFRMA_OFFLOAD_DEV:
276 case XFRMA_SET_MARK:
277 case XFRMA_SET_MARK_MASK:
278 case XFRMA_IF_ID:
279 case XFRMA_MTIMER_THRESH:
280 return xfrm_nla_cpy(dst, src, nla_len(src));
281 default:
282 BUILD_BUG_ON(XFRMA_MAX != XFRMA_MTIMER_THRESH);
283 pr_warn_once("unsupported nla_type %d\n", src->nla_type);
284 return -EOPNOTSUPP;
285 }
286}
287
288/* Take kernel-built (64bit layout) and create 32bit layout for userspace */
289static int xfrm_xlate64(struct sk_buff *dst, const struct nlmsghdr *nlh_src)
290{
291 u16 type = nlh_src->nlmsg_type - XFRM_MSG_BASE;
292 const struct nlattr *nla, *attrs;
293 struct nlmsghdr *nlh_dst;
294 int len, remaining;
295
296 nlh_dst = xfrm_nlmsg_put_compat(dst, nlh_src, type);
297 if (IS_ERR(nlh_dst))
298 return PTR_ERR(nlh_dst);
299
300 attrs = nlmsg_attrdata(nlh_src, xfrm_msg_min[type]);
301 len = nlmsg_attrlen(nlh_src, xfrm_msg_min[type]);
302
303 nla_for_each_attr(nla, attrs, len, remaining) {
304 int err;
305
306 switch (nlh_src->nlmsg_type) {
307 case XFRM_MSG_NEWSPDINFO:
308 err = xfrm_nla_cpy(dst, nla, nla_len(nla));
309 break;
310 default:
311 err = xfrm_xlate64_attr(dst, nla);
312 break;
313 }
314 if (err)
315 return err;
316 }
317
318 nlmsg_end(dst, nlh_dst);
319
320 return 0;
321}
322
323static int xfrm_alloc_compat(struct sk_buff *skb, const struct nlmsghdr *nlh_src)
324{
325 u16 type = nlh_src->nlmsg_type - XFRM_MSG_BASE;
326 struct sk_buff *new = NULL;
327 int err;
328
329 if (type >= ARRAY_SIZE(xfrm_msg_min)) {
330 pr_warn_once("unsupported nlmsg_type %d\n", nlh_src->nlmsg_type);
331 return -EOPNOTSUPP;
332 }
333
334 if (skb_shinfo(skb)->frag_list == NULL) {
335 new = alloc_skb(skb->len + skb_tailroom(skb), GFP_ATOMIC);
336 if (!new)
337 return -ENOMEM;
338 skb_shinfo(skb)->frag_list = new;
339 }
340
341 err = xfrm_xlate64(skb_shinfo(skb)->frag_list, nlh_src);
342 if (err) {
343 if (new) {
344 kfree_skb(new);
345 skb_shinfo(skb)->frag_list = NULL;
346 }
347 return err;
348 }
349
350 return 0;
351}
352
353/* Calculates len of translated 64-bit message. */
354static size_t xfrm_user_rcv_calculate_len64(const struct nlmsghdr *src,
355 struct nlattr *attrs[XFRMA_MAX + 1],
356 int maxtype)
357{
358 size_t len = nlmsg_len(src);
359
360 switch (src->nlmsg_type) {
361 case XFRM_MSG_NEWSA:
362 case XFRM_MSG_NEWPOLICY:
363 case XFRM_MSG_ALLOCSPI:
364 case XFRM_MSG_ACQUIRE:
365 case XFRM_MSG_UPDPOLICY:
366 case XFRM_MSG_UPDSA:
367 len += 4;
368 break;
369 case XFRM_MSG_EXPIRE:
370 case XFRM_MSG_POLEXPIRE:
371 len += 8;
372 break;
373 case XFRM_MSG_NEWSPDINFO:
374 /* attirbutes are xfrm_spdattr_type_t, not xfrm_attr_type_t */
375 return len;
376 default:
377 break;
378 }
379
380 /* Unexpected for anything, but XFRM_MSG_NEWSPDINFO, please
381 * correct both 64=>32-bit and 32=>64-bit translators to copy
382 * new attributes.
383 */
384 if (WARN_ON_ONCE(maxtype))
385 return len;
386
387 if (attrs[XFRMA_SA])
388 len += 4;
389 if (attrs[XFRMA_POLICY])
390 len += 4;
391
392 /* XXX: some attrs may need to be realigned
393 * if !CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
394 */
395
396 return len;
397}
398
399static int xfrm_attr_cpy32(void *dst, size_t *pos, const struct nlattr *src,
400 size_t size, int copy_len, int payload)
401{
402 struct nlmsghdr *nlmsg = dst;
403 struct nlattr *nla;
404
405 /* xfrm_user_rcv_msg_compat() relies on fact that 32-bit messages
406 * have the same len or shorted than 64-bit ones.
407 * 32-bit translation that is bigger than 64-bit original is unexpected.
408 */
409 if (WARN_ON_ONCE(copy_len > payload))
410 copy_len = payload;
411
412 if (size - *pos < nla_attr_size(payload))
413 return -ENOBUFS;
414
415 nla = dst + *pos;
416
417 memcpy(nla, src, nla_attr_size(copy_len));
418 nla->nla_len = nla_attr_size(payload);
419 *pos += nla_attr_size(copy_len);
420 nlmsg->nlmsg_len += nla->nla_len;
421
422 memset(dst + *pos, 0, payload - copy_len);
423 *pos += payload - copy_len;
424
425 return 0;
426}
427
428static int xfrm_xlate32_attr(void *dst, const struct nlattr *nla,
429 size_t *pos, size_t size,
430 struct netlink_ext_ack *extack)
431{
432 int type = nla_type(nla);
433 u16 pol_len32, pol_len64;
434 int err;
435
436 if (type > XFRMA_MAX) {
437 BUILD_BUG_ON(XFRMA_MAX != XFRMA_MTIMER_THRESH);
438 NL_SET_ERR_MSG(extack, "Bad attribute");
439 return -EOPNOTSUPP;
440 }
441 type = array_index_nospec(type, XFRMA_MAX + 1);
442 if (nla_len(nla) < compat_policy[type].len) {
443 NL_SET_ERR_MSG(extack, "Attribute bad length");
444 return -EOPNOTSUPP;
445 }
446
447 pol_len32 = compat_policy[type].len;
448 pol_len64 = xfrma_policy[type].len;
449
450 /* XFRMA_SA and XFRMA_POLICY - need to know how-to translate */
451 if (pol_len32 != pol_len64) {
452 if (nla_len(nla) != compat_policy[type].len) {
453 NL_SET_ERR_MSG(extack, "Attribute bad length");
454 return -EOPNOTSUPP;
455 }
456 err = xfrm_attr_cpy32(dst, pos, nla, size, pol_len32, pol_len64);
457 if (err)
458 return err;
459 }
460
461 return xfrm_attr_cpy32(dst, pos, nla, size, nla_len(nla), nla_len(nla));
462}
463
464static int xfrm_xlate32(struct nlmsghdr *dst, const struct nlmsghdr *src,
465 struct nlattr *attrs[XFRMA_MAX+1],
466 size_t size, u8 type, int maxtype,
467 struct netlink_ext_ack *extack)
468{
469 size_t pos;
470 int i;
471
472 memcpy(dst, src, NLMSG_HDRLEN);
473 dst->nlmsg_len = NLMSG_HDRLEN + xfrm_msg_min[type];
474 memset(nlmsg_data(dst), 0, xfrm_msg_min[type]);
475
476 switch (src->nlmsg_type) {
477 /* Compat message has the same layout as native */
478 case XFRM_MSG_DELSA:
479 case XFRM_MSG_GETSA:
480 case XFRM_MSG_DELPOLICY:
481 case XFRM_MSG_GETPOLICY:
482 case XFRM_MSG_FLUSHSA:
483 case XFRM_MSG_FLUSHPOLICY:
484 case XFRM_MSG_NEWAE:
485 case XFRM_MSG_GETAE:
486 case XFRM_MSG_REPORT:
487 case XFRM_MSG_MIGRATE:
488 case XFRM_MSG_NEWSADINFO:
489 case XFRM_MSG_GETSADINFO:
490 case XFRM_MSG_NEWSPDINFO:
491 case XFRM_MSG_GETSPDINFO:
492 case XFRM_MSG_MAPPING:
493 memcpy(nlmsg_data(dst), nlmsg_data(src), compat_msg_min[type]);
494 break;
495 /* 4 byte alignment for trailing u64 on native, but not on compat */
496 case XFRM_MSG_NEWSA:
497 case XFRM_MSG_NEWPOLICY:
498 case XFRM_MSG_UPDSA:
499 case XFRM_MSG_UPDPOLICY:
500 memcpy(nlmsg_data(dst), nlmsg_data(src), compat_msg_min[type]);
501 break;
502 case XFRM_MSG_EXPIRE: {
503 const struct compat_xfrm_user_expire *src_ue = nlmsg_data(src);
504 struct xfrm_user_expire *dst_ue = nlmsg_data(dst);
505
506 /* compat_xfrm_user_expire has 4-byte smaller state */
507 memcpy(dst_ue, src_ue, sizeof(src_ue->state));
508 dst_ue->hard = src_ue->hard;
509 break;
510 }
511 case XFRM_MSG_ACQUIRE: {
512 const struct compat_xfrm_user_acquire *src_ua = nlmsg_data(src);
513 struct xfrm_user_acquire *dst_ua = nlmsg_data(dst);
514
515 memcpy(dst_ua, src_ua, offsetof(struct compat_xfrm_user_acquire, aalgos));
516 dst_ua->aalgos = src_ua->aalgos;
517 dst_ua->ealgos = src_ua->ealgos;
518 dst_ua->calgos = src_ua->calgos;
519 dst_ua->seq = src_ua->seq;
520 break;
521 }
522 case XFRM_MSG_POLEXPIRE: {
523 const struct compat_xfrm_user_polexpire *src_upe = nlmsg_data(src);
524 struct xfrm_user_polexpire *dst_upe = nlmsg_data(dst);
525
526 /* compat_xfrm_user_polexpire has 4-byte smaller state */
527 memcpy(dst_upe, src_upe, sizeof(src_upe->pol));
528 dst_upe->hard = src_upe->hard;
529 break;
530 }
531 case XFRM_MSG_ALLOCSPI: {
532 const struct compat_xfrm_userspi_info *src_usi = nlmsg_data(src);
533 struct xfrm_userspi_info *dst_usi = nlmsg_data(dst);
534
535 /* compat_xfrm_user_polexpire has 4-byte smaller state */
536 memcpy(dst_usi, src_usi, sizeof(src_usi->info));
537 dst_usi->min = src_usi->min;
538 dst_usi->max = src_usi->max;
539 break;
540 }
541 default:
542 NL_SET_ERR_MSG(extack, "Unsupported message type");
543 return -EOPNOTSUPP;
544 }
545 pos = dst->nlmsg_len;
546
547 if (maxtype) {
548 /* attirbutes are xfrm_spdattr_type_t, not xfrm_attr_type_t */
549 WARN_ON_ONCE(src->nlmsg_type != XFRM_MSG_NEWSPDINFO);
550
551 for (i = 1; i <= maxtype; i++) {
552 int err;
553
554 if (!attrs[i])
555 continue;
556
557 /* just copy - no need for translation */
558 err = xfrm_attr_cpy32(dst, &pos, attrs[i], size,
559 nla_len(attrs[i]), nla_len(attrs[i]));
560 if (err)
561 return err;
562 }
563 return 0;
564 }
565
566 for (i = 1; i < XFRMA_MAX + 1; i++) {
567 int err;
568
569 if (i == XFRMA_PAD)
570 continue;
571
572 if (!attrs[i])
573 continue;
574
575 err = xfrm_xlate32_attr(dst, attrs[i], &pos, size, extack);
576 if (err)
577 return err;
578 }
579
580 return 0;
581}
582
583static struct nlmsghdr *xfrm_user_rcv_msg_compat(const struct nlmsghdr *h32,
584 int maxtype, const struct nla_policy *policy,
585 struct netlink_ext_ack *extack)
586{
587 /* netlink_rcv_skb() checks if a message has full (struct nlmsghdr) */
588 u16 type = h32->nlmsg_type - XFRM_MSG_BASE;
589 struct nlattr *attrs[XFRMA_MAX+1];
590 struct nlmsghdr *h64;
591 size_t len;
592 int err;
593
594 BUILD_BUG_ON(ARRAY_SIZE(xfrm_msg_min) != ARRAY_SIZE(compat_msg_min));
595
596 if (type >= ARRAY_SIZE(xfrm_msg_min))
597 return ERR_PTR(-EINVAL);
598
599 /* Don't call parse: the message might have only nlmsg header */
600 if ((h32->nlmsg_type == XFRM_MSG_GETSA ||
601 h32->nlmsg_type == XFRM_MSG_GETPOLICY) &&
602 (h32->nlmsg_flags & NLM_F_DUMP))
603 return NULL;
604
605 err = nlmsg_parse_deprecated(h32, compat_msg_min[type], attrs,
606 maxtype ? : XFRMA_MAX, policy ? : compat_policy, extack);
607 if (err < 0)
608 return ERR_PTR(err);
609
610 len = xfrm_user_rcv_calculate_len64(h32, attrs, maxtype);
611 /* The message doesn't need translation */
612 if (len == nlmsg_len(h32))
613 return NULL;
614
615 len += NLMSG_HDRLEN;
616 h64 = kvmalloc(len, GFP_KERNEL);
617 if (!h64)
618 return ERR_PTR(-ENOMEM);
619
620 err = xfrm_xlate32(h64, h32, attrs, len, type, maxtype, extack);
621 if (err < 0) {
622 kvfree(h64);
623 return ERR_PTR(err);
624 }
625
626 return h64;
627}
628
629static int xfrm_user_policy_compat(u8 **pdata32, int optlen)
630{
631 struct compat_xfrm_userpolicy_info *p = (void *)*pdata32;
632 u8 *src_templates, *dst_templates;
633 u8 *data64;
634
635 if (optlen < sizeof(*p))
636 return -EINVAL;
637
638 data64 = kmalloc_track_caller(optlen + 4, GFP_USER | __GFP_NOWARN);
639 if (!data64)
640 return -ENOMEM;
641
642 memcpy(data64, *pdata32, sizeof(*p));
643 memset(data64 + sizeof(*p), 0, 4);
644
645 src_templates = *pdata32 + sizeof(*p);
646 dst_templates = data64 + sizeof(*p) + 4;
647 memcpy(dst_templates, src_templates, optlen - sizeof(*p));
648
649 kfree(*pdata32);
650 *pdata32 = data64;
651 return 0;
652}
653
654static struct xfrm_translator xfrm_translator = {
655 .owner = THIS_MODULE,
656 .alloc_compat = xfrm_alloc_compat,
657 .rcv_msg_compat = xfrm_user_rcv_msg_compat,
658 .xlate_user_policy_sockptr = xfrm_user_policy_compat,
659};
660
661static int __init xfrm_compat_init(void)
662{
663 return xfrm_register_translator(&xfrm_translator);
664}
665
666static void __exit xfrm_compat_exit(void)
667{
668 xfrm_unregister_translator(&xfrm_translator);
669}
670
671module_init(xfrm_compat_init);
672module_exit(xfrm_compat_exit);
673MODULE_LICENSE("GPL");
674MODULE_AUTHOR("Dmitry Safonov");
675MODULE_DESCRIPTION("XFRM 32-bit compatibility layer");