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c9e7c76d DS |
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> | |
b6ee8963 | 8 | #include <linux/nospec.h> |
c9e7c76d DS |
9 | #include <linux/xfrm.h> |
10 | #include <net/xfrm.h> | |
11 | ||
5461fc0c DS |
12 | struct 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 | ||
19 | struct 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 | ||
23 | struct 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 | ||
32 | struct 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 | ||
45 | struct 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 | ||
54 | struct compat_xfrm_userspi_info { | |
55 | struct compat_xfrm_usersa_info info; | |
56 | /* 4 bytes additional padding on 64bit */ | |
57 | __u32 min, max; | |
58 | }; | |
59 | ||
60 | struct compat_xfrm_user_expire { | |
61 | struct compat_xfrm_usersa_info state; | |
62 | /* 8 bytes additional padding on 64bit */ | |
63 | u8 hard; | |
64 | }; | |
65 | ||
66 | struct 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 | ||
74 | static 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 | ||
5106f4a8 DS |
100 | static 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) }, | |
d1e0e61d | 111 | [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_user_sec_ctx) }, |
5106f4a8 DS |
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 }, | |
4e484b3e | 131 | [XFRMA_MTIMER_THRESH] = { .type = NLA_U32 }, |
5106f4a8 DS |
132 | }; |
133 | ||
5461fc0c DS |
134 | static 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: | |
ef19e111 | 221 | pr_warn_once("unsupported nlmsg_type %d\n", nlh_src->nlmsg_type); |
5461fc0c DS |
222 | return ERR_PTR(-EOPNOTSUPP); |
223 | } | |
224 | ||
225 | return nlh_dst; | |
226 | } | |
227 | ||
228 | static 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 | ||
233 | static 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; | |
dbd7ae51 | 239 | case XFRMA_UNSPEC: |
5461fc0c DS |
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: | |
4e484b3e | 279 | case XFRMA_MTIMER_THRESH: |
5461fc0c DS |
280 | return xfrm_nla_cpy(dst, src, nla_len(src)); |
281 | default: | |
4e484b3e | 282 | BUILD_BUG_ON(XFRMA_MAX != XFRMA_MTIMER_THRESH); |
ef19e111 | 283 | pr_warn_once("unsupported nla_type %d\n", src->nla_type); |
5461fc0c DS |
284 | return -EOPNOTSUPP; |
285 | } | |
286 | } | |
287 | ||
288 | /* Take kernel-built (64bit layout) and create 32bit layout for userspace */ | |
289 | static 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) { | |
4e950506 | 304 | int err; |
5461fc0c | 305 | |
eb6c59b7 | 306 | switch (nlh_src->nlmsg_type) { |
4e950506 DS |
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 | } | |
5461fc0c DS |
314 | if (err) |
315 | return err; | |
316 | } | |
317 | ||
318 | nlmsg_end(dst, nlh_dst); | |
319 | ||
320 | return 0; | |
321 | } | |
322 | ||
323 | static 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 | ||
ef19e111 DS |
329 | if (type >= ARRAY_SIZE(xfrm_msg_min)) { |
330 | pr_warn_once("unsupported nlmsg_type %d\n", nlh_src->nlmsg_type); | |
5461fc0c | 331 | return -EOPNOTSUPP; |
ef19e111 | 332 | } |
5461fc0c DS |
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 | ||
5106f4a8 DS |
353 | /* Calculates len of translated 64-bit message. */ |
354 | static size_t xfrm_user_rcv_calculate_len64(const struct nlmsghdr *src, | |
4e950506 DS |
355 | struct nlattr *attrs[XFRMA_MAX + 1], |
356 | int maxtype) | |
5106f4a8 DS |
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; | |
4e950506 DS |
373 | case XFRM_MSG_NEWSPDINFO: |
374 | /* attirbutes are xfrm_spdattr_type_t, not xfrm_attr_type_t */ | |
375 | return len; | |
5106f4a8 DS |
376 | default: |
377 | break; | |
378 | } | |
379 | ||
4e950506 DS |
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 | ||
5106f4a8 DS |
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 | ||
399 | static 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 | ||
ef19e111 DS |
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 | */ | |
5106f4a8 DS |
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); | |
d1949d04 | 419 | *pos += nla_attr_size(copy_len); |
5106f4a8 DS |
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 | ||
428 | static 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) { | |
4e484b3e | 437 | BUILD_BUG_ON(XFRMA_MAX != XFRMA_MTIMER_THRESH); |
5106f4a8 DS |
438 | NL_SET_ERR_MSG(extack, "Bad attribute"); |
439 | return -EOPNOTSUPP; | |
440 | } | |
b6ee8963 | 441 | type = array_index_nospec(type, XFRMA_MAX + 1); |
5106f4a8 DS |
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 | ||
464 | static int xfrm_xlate32(struct nlmsghdr *dst, const struct nlmsghdr *src, | |
465 | struct nlattr *attrs[XFRMA_MAX+1], | |
4e950506 DS |
466 | size_t size, u8 type, int maxtype, |
467 | struct netlink_ext_ack *extack) | |
5106f4a8 DS |
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 | ||
4e950506 DS |
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 | ||
5106f4a8 DS |
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 | ||
583 | static 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 | ||
4e950506 | 610 | len = xfrm_user_rcv_calculate_len64(h32, attrs, maxtype); |
5106f4a8 DS |
611 | /* The message doesn't need translation */ |
612 | if (len == nlmsg_len(h32)) | |
613 | return NULL; | |
614 | ||
615 | len += NLMSG_HDRLEN; | |
ad37f77f | 616 | h64 = kvmalloc(len, GFP_KERNEL); |
5106f4a8 DS |
617 | if (!h64) |
618 | return ERR_PTR(-ENOMEM); | |
619 | ||
4e950506 | 620 | err = xfrm_xlate32(h64, h32, attrs, len, type, maxtype, extack); |
5106f4a8 DS |
621 | if (err < 0) { |
622 | kvfree(h64); | |
623 | return ERR_PTR(err); | |
624 | } | |
625 | ||
626 | return h64; | |
627 | } | |
628 | ||
96392ee5 DS |
629 | static 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 | ||
c9e7c76d DS |
654 | static struct xfrm_translator xfrm_translator = { |
655 | .owner = THIS_MODULE, | |
5461fc0c | 656 | .alloc_compat = xfrm_alloc_compat, |
5106f4a8 | 657 | .rcv_msg_compat = xfrm_user_rcv_msg_compat, |
96392ee5 | 658 | .xlate_user_policy_sockptr = xfrm_user_policy_compat, |
c9e7c76d DS |
659 | }; |
660 | ||
661 | static int __init xfrm_compat_init(void) | |
662 | { | |
663 | return xfrm_register_translator(&xfrm_translator); | |
664 | } | |
665 | ||
666 | static void __exit xfrm_compat_exit(void) | |
667 | { | |
668 | xfrm_unregister_translator(&xfrm_translator); | |
669 | } | |
670 | ||
671 | module_init(xfrm_compat_init); | |
672 | module_exit(xfrm_compat_exit); | |
673 | MODULE_LICENSE("GPL"); | |
674 | MODULE_AUTHOR("Dmitry Safonov"); | |
675 | MODULE_DESCRIPTION("XFRM 32-bit compatibility layer"); |