1 // SPDX-License-Identifier: GPL-2.0
4 * Author: Dmitry Safonov <dima@arista.com>
5 * Based on code and translator idea by: Florian Westphal <fw@strlen.de>
7 #include <linux/compat.h>
8 #include <linux/xfrm.h>
11 struct compat_xfrm_lifetime_cfg {
12 compat_u64 soft_byte_limit, hard_byte_limit;
13 compat_u64 soft_packet_limit, hard_packet_limit;
14 compat_u64 soft_add_expires_seconds, hard_add_expires_seconds;
15 compat_u64 soft_use_expires_seconds, hard_use_expires_seconds;
16 }; /* same size on 32bit, but only 4 byte alignment required */
18 struct compat_xfrm_lifetime_cur {
19 compat_u64 bytes, packets, add_time, use_time;
20 }; /* same size on 32bit, but only 4 byte alignment required */
22 struct compat_xfrm_userpolicy_info {
23 struct xfrm_selector sel;
24 struct compat_xfrm_lifetime_cfg lft;
25 struct compat_xfrm_lifetime_cur curlft;
26 __u32 priority, index;
27 u8 dir, action, flags, share;
28 /* 4 bytes additional padding on 64bit */
31 struct compat_xfrm_usersa_info {
32 struct xfrm_selector sel;
35 struct compat_xfrm_lifetime_cfg lft;
36 struct compat_xfrm_lifetime_cur curlft;
37 struct xfrm_stats stats;
40 u8 mode, replay_window, flags;
41 /* 4 bytes additional padding on 64bit */
44 struct compat_xfrm_user_acquire {
47 struct xfrm_selector sel;
48 struct compat_xfrm_userpolicy_info policy;
49 /* 4 bytes additional padding on 64bit */
50 __u32 aalgos, ealgos, calgos, seq;
53 struct compat_xfrm_userspi_info {
54 struct compat_xfrm_usersa_info info;
55 /* 4 bytes additional padding on 64bit */
59 struct compat_xfrm_user_expire {
60 struct compat_xfrm_usersa_info state;
61 /* 8 bytes additional padding on 64bit */
65 struct compat_xfrm_user_polexpire {
66 struct compat_xfrm_userpolicy_info pol;
67 /* 8 bytes additional padding on 64bit */
71 #define XMSGSIZE(type) sizeof(struct type)
73 static const int compat_msg_min[XFRM_NR_MSGTYPES] = {
74 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(compat_xfrm_usersa_info),
75 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
76 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
77 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(compat_xfrm_userpolicy_info),
78 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
79 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
80 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(compat_xfrm_userspi_info),
81 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(compat_xfrm_user_acquire),
82 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(compat_xfrm_user_expire),
83 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(compat_xfrm_userpolicy_info),
84 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(compat_xfrm_usersa_info),
85 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(compat_xfrm_user_polexpire),
86 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
87 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0,
88 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
89 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
90 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
91 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
92 [XFRM_MSG_NEWSADINFO - XFRM_MSG_BASE] = sizeof(u32),
93 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32),
94 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
95 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
96 [XFRM_MSG_MAPPING - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_mapping)
99 static const struct nla_policy compat_policy[XFRMA_MAX+1] = {
100 [XFRMA_SA] = { .len = XMSGSIZE(compat_xfrm_usersa_info)},
101 [XFRMA_POLICY] = { .len = XMSGSIZE(compat_xfrm_userpolicy_info)},
102 [XFRMA_LASTUSED] = { .type = NLA_U64},
103 [XFRMA_ALG_AUTH_TRUNC] = { .len = sizeof(struct xfrm_algo_auth)},
104 [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) },
105 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) },
106 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) },
107 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) },
108 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) },
109 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) },
110 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_sec_ctx) },
111 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) },
112 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) },
113 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 },
114 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 },
115 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) },
116 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) },
117 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)},
118 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) },
119 [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) },
120 [XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) },
121 [XFRMA_TFCPAD] = { .type = NLA_U32 },
122 [XFRMA_REPLAY_ESN_VAL] = { .len = sizeof(struct xfrm_replay_state_esn) },
123 [XFRMA_SA_EXTRA_FLAGS] = { .type = NLA_U32 },
124 [XFRMA_PROTO] = { .type = NLA_U8 },
125 [XFRMA_ADDRESS_FILTER] = { .len = sizeof(struct xfrm_address_filter) },
126 [XFRMA_OFFLOAD_DEV] = { .len = sizeof(struct xfrm_user_offload) },
127 [XFRMA_SET_MARK] = { .type = NLA_U32 },
128 [XFRMA_SET_MARK_MASK] = { .type = NLA_U32 },
129 [XFRMA_IF_ID] = { .type = NLA_U32 },
132 static struct nlmsghdr *xfrm_nlmsg_put_compat(struct sk_buff *skb,
133 const struct nlmsghdr *nlh_src, u16 type)
135 int payload = compat_msg_min[type];
136 int src_len = xfrm_msg_min[type];
137 struct nlmsghdr *nlh_dst;
139 /* Compat messages are shorter or equal to native (+padding) */
140 if (WARN_ON_ONCE(src_len < payload))
141 return ERR_PTR(-EMSGSIZE);
143 nlh_dst = nlmsg_put(skb, nlh_src->nlmsg_pid, nlh_src->nlmsg_seq,
144 nlh_src->nlmsg_type, payload, nlh_src->nlmsg_flags);
146 return ERR_PTR(-EMSGSIZE);
148 memset(nlmsg_data(nlh_dst), 0, payload);
150 switch (nlh_src->nlmsg_type) {
151 /* Compat message has the same layout as native */
153 case XFRM_MSG_DELPOLICY:
154 case XFRM_MSG_FLUSHSA:
155 case XFRM_MSG_FLUSHPOLICY:
157 case XFRM_MSG_REPORT:
158 case XFRM_MSG_MIGRATE:
159 case XFRM_MSG_NEWSADINFO:
160 case XFRM_MSG_NEWSPDINFO:
161 case XFRM_MSG_MAPPING:
162 WARN_ON_ONCE(src_len != payload);
163 memcpy(nlmsg_data(nlh_dst), nlmsg_data(nlh_src), src_len);
165 /* 4 byte alignment for trailing u64 on native, but not on compat */
167 case XFRM_MSG_NEWPOLICY:
169 case XFRM_MSG_UPDPOLICY:
170 WARN_ON_ONCE(src_len != payload + 4);
171 memcpy(nlmsg_data(nlh_dst), nlmsg_data(nlh_src), payload);
173 case XFRM_MSG_EXPIRE: {
174 const struct xfrm_user_expire *src_ue = nlmsg_data(nlh_src);
175 struct compat_xfrm_user_expire *dst_ue = nlmsg_data(nlh_dst);
177 /* compat_xfrm_user_expire has 4-byte smaller state */
178 memcpy(dst_ue, src_ue, sizeof(dst_ue->state));
179 dst_ue->hard = src_ue->hard;
182 case XFRM_MSG_ACQUIRE: {
183 const struct xfrm_user_acquire *src_ua = nlmsg_data(nlh_src);
184 struct compat_xfrm_user_acquire *dst_ua = nlmsg_data(nlh_dst);
186 memcpy(dst_ua, src_ua, offsetof(struct compat_xfrm_user_acquire, aalgos));
187 dst_ua->aalgos = src_ua->aalgos;
188 dst_ua->ealgos = src_ua->ealgos;
189 dst_ua->calgos = src_ua->calgos;
190 dst_ua->seq = src_ua->seq;
193 case XFRM_MSG_POLEXPIRE: {
194 const struct xfrm_user_polexpire *src_upe = nlmsg_data(nlh_src);
195 struct compat_xfrm_user_polexpire *dst_upe = nlmsg_data(nlh_dst);
197 /* compat_xfrm_user_polexpire has 4-byte smaller state */
198 memcpy(dst_upe, src_upe, sizeof(dst_upe->pol));
199 dst_upe->hard = src_upe->hard;
202 case XFRM_MSG_ALLOCSPI: {
203 const struct xfrm_userspi_info *src_usi = nlmsg_data(nlh_src);
204 struct compat_xfrm_userspi_info *dst_usi = nlmsg_data(nlh_dst);
206 /* compat_xfrm_user_polexpire has 4-byte smaller state */
207 memcpy(dst_usi, src_usi, sizeof(src_usi->info));
208 dst_usi->min = src_usi->min;
209 dst_usi->max = src_usi->max;
212 /* Not being sent by kernel */
214 case XFRM_MSG_GETPOLICY:
216 case XFRM_MSG_GETSADINFO:
217 case XFRM_MSG_GETSPDINFO:
219 WARN_ONCE(1, "unsupported nlmsg_type %d", nlh_src->nlmsg_type);
220 return ERR_PTR(-EOPNOTSUPP);
226 static int xfrm_nla_cpy(struct sk_buff *dst, const struct nlattr *src, int len)
228 return nla_put(dst, src->nla_type, len, nla_data(src));
231 static int xfrm_xlate64_attr(struct sk_buff *dst, const struct nlattr *src)
233 switch (src->nla_type) {
238 case XFRMA_ALG_CRYPT:
242 return xfrm_nla_cpy(dst, src, nla_len(src));
244 return xfrm_nla_cpy(dst, src, XMSGSIZE(compat_xfrm_usersa_info));
246 return xfrm_nla_cpy(dst, src, XMSGSIZE(compat_xfrm_userpolicy_info));
248 return xfrm_nla_cpy(dst, src, nla_len(src));
249 case XFRMA_LTIME_VAL:
250 return nla_put_64bit(dst, src->nla_type, nla_len(src),
251 nla_data(src), XFRMA_PAD);
252 case XFRMA_REPLAY_VAL:
253 case XFRMA_REPLAY_THRESH:
254 case XFRMA_ETIMER_THRESH:
257 return xfrm_nla_cpy(dst, src, nla_len(src));
259 return nla_put_64bit(dst, src->nla_type, nla_len(src),
260 nla_data(src), XFRMA_PAD);
261 case XFRMA_POLICY_TYPE:
264 case XFRMA_KMADDRESS:
265 case XFRMA_ALG_AUTH_TRUNC:
268 case XFRMA_REPLAY_ESN_VAL:
269 case XFRMA_SA_EXTRA_FLAGS:
271 case XFRMA_ADDRESS_FILTER:
272 case XFRMA_OFFLOAD_DEV:
274 case XFRMA_SET_MARK_MASK:
276 return xfrm_nla_cpy(dst, src, nla_len(src));
278 BUILD_BUG_ON(XFRMA_MAX != XFRMA_IF_ID);
279 WARN_ONCE(1, "unsupported nla_type %d", src->nla_type);
284 /* Take kernel-built (64bit layout) and create 32bit layout for userspace */
285 static int xfrm_xlate64(struct sk_buff *dst, const struct nlmsghdr *nlh_src)
287 u16 type = nlh_src->nlmsg_type - XFRM_MSG_BASE;
288 const struct nlattr *nla, *attrs;
289 struct nlmsghdr *nlh_dst;
292 nlh_dst = xfrm_nlmsg_put_compat(dst, nlh_src, type);
294 return PTR_ERR(nlh_dst);
296 attrs = nlmsg_attrdata(nlh_src, xfrm_msg_min[type]);
297 len = nlmsg_attrlen(nlh_src, xfrm_msg_min[type]);
299 nla_for_each_attr(nla, attrs, len, remaining) {
300 int err = xfrm_xlate64_attr(dst, nla);
306 nlmsg_end(dst, nlh_dst);
311 static int xfrm_alloc_compat(struct sk_buff *skb, const struct nlmsghdr *nlh_src)
313 u16 type = nlh_src->nlmsg_type - XFRM_MSG_BASE;
314 struct sk_buff *new = NULL;
317 if (WARN_ON_ONCE(type >= ARRAY_SIZE(xfrm_msg_min)))
320 if (skb_shinfo(skb)->frag_list == NULL) {
321 new = alloc_skb(skb->len + skb_tailroom(skb), GFP_ATOMIC);
324 skb_shinfo(skb)->frag_list = new;
327 err = xfrm_xlate64(skb_shinfo(skb)->frag_list, nlh_src);
331 skb_shinfo(skb)->frag_list = NULL;
339 /* Calculates len of translated 64-bit message. */
340 static size_t xfrm_user_rcv_calculate_len64(const struct nlmsghdr *src,
341 struct nlattr *attrs[XFRMA_MAX+1])
343 size_t len = nlmsg_len(src);
345 switch (src->nlmsg_type) {
347 case XFRM_MSG_NEWPOLICY:
348 case XFRM_MSG_ALLOCSPI:
349 case XFRM_MSG_ACQUIRE:
350 case XFRM_MSG_UPDPOLICY:
354 case XFRM_MSG_EXPIRE:
355 case XFRM_MSG_POLEXPIRE:
364 if (attrs[XFRMA_POLICY])
367 /* XXX: some attrs may need to be realigned
368 * if !CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
374 static int xfrm_attr_cpy32(void *dst, size_t *pos, const struct nlattr *src,
375 size_t size, int copy_len, int payload)
377 struct nlmsghdr *nlmsg = dst;
380 if (WARN_ON_ONCE(copy_len > payload))
383 if (size - *pos < nla_attr_size(payload))
388 memcpy(nla, src, nla_attr_size(copy_len));
389 nla->nla_len = nla_attr_size(payload);
390 *pos += nla_attr_size(payload);
391 nlmsg->nlmsg_len += nla->nla_len;
393 memset(dst + *pos, 0, payload - copy_len);
394 *pos += payload - copy_len;
399 static int xfrm_xlate32_attr(void *dst, const struct nlattr *nla,
400 size_t *pos, size_t size,
401 struct netlink_ext_ack *extack)
403 int type = nla_type(nla);
404 u16 pol_len32, pol_len64;
407 if (type > XFRMA_MAX) {
408 BUILD_BUG_ON(XFRMA_MAX != XFRMA_IF_ID);
409 NL_SET_ERR_MSG(extack, "Bad attribute");
412 if (nla_len(nla) < compat_policy[type].len) {
413 NL_SET_ERR_MSG(extack, "Attribute bad length");
417 pol_len32 = compat_policy[type].len;
418 pol_len64 = xfrma_policy[type].len;
420 /* XFRMA_SA and XFRMA_POLICY - need to know how-to translate */
421 if (pol_len32 != pol_len64) {
422 if (nla_len(nla) != compat_policy[type].len) {
423 NL_SET_ERR_MSG(extack, "Attribute bad length");
426 err = xfrm_attr_cpy32(dst, pos, nla, size, pol_len32, pol_len64);
431 return xfrm_attr_cpy32(dst, pos, nla, size, nla_len(nla), nla_len(nla));
434 static int xfrm_xlate32(struct nlmsghdr *dst, const struct nlmsghdr *src,
435 struct nlattr *attrs[XFRMA_MAX+1],
436 size_t size, u8 type, struct netlink_ext_ack *extack)
441 memcpy(dst, src, NLMSG_HDRLEN);
442 dst->nlmsg_len = NLMSG_HDRLEN + xfrm_msg_min[type];
443 memset(nlmsg_data(dst), 0, xfrm_msg_min[type]);
445 switch (src->nlmsg_type) {
446 /* Compat message has the same layout as native */
449 case XFRM_MSG_DELPOLICY:
450 case XFRM_MSG_GETPOLICY:
451 case XFRM_MSG_FLUSHSA:
452 case XFRM_MSG_FLUSHPOLICY:
455 case XFRM_MSG_REPORT:
456 case XFRM_MSG_MIGRATE:
457 case XFRM_MSG_NEWSADINFO:
458 case XFRM_MSG_GETSADINFO:
459 case XFRM_MSG_NEWSPDINFO:
460 case XFRM_MSG_GETSPDINFO:
461 case XFRM_MSG_MAPPING:
462 memcpy(nlmsg_data(dst), nlmsg_data(src), compat_msg_min[type]);
464 /* 4 byte alignment for trailing u64 on native, but not on compat */
466 case XFRM_MSG_NEWPOLICY:
468 case XFRM_MSG_UPDPOLICY:
469 memcpy(nlmsg_data(dst), nlmsg_data(src), compat_msg_min[type]);
471 case XFRM_MSG_EXPIRE: {
472 const struct compat_xfrm_user_expire *src_ue = nlmsg_data(src);
473 struct xfrm_user_expire *dst_ue = nlmsg_data(dst);
475 /* compat_xfrm_user_expire has 4-byte smaller state */
476 memcpy(dst_ue, src_ue, sizeof(src_ue->state));
477 dst_ue->hard = src_ue->hard;
480 case XFRM_MSG_ACQUIRE: {
481 const struct compat_xfrm_user_acquire *src_ua = nlmsg_data(src);
482 struct xfrm_user_acquire *dst_ua = nlmsg_data(dst);
484 memcpy(dst_ua, src_ua, offsetof(struct compat_xfrm_user_acquire, aalgos));
485 dst_ua->aalgos = src_ua->aalgos;
486 dst_ua->ealgos = src_ua->ealgos;
487 dst_ua->calgos = src_ua->calgos;
488 dst_ua->seq = src_ua->seq;
491 case XFRM_MSG_POLEXPIRE: {
492 const struct compat_xfrm_user_polexpire *src_upe = nlmsg_data(src);
493 struct xfrm_user_polexpire *dst_upe = nlmsg_data(dst);
495 /* compat_xfrm_user_polexpire has 4-byte smaller state */
496 memcpy(dst_upe, src_upe, sizeof(src_upe->pol));
497 dst_upe->hard = src_upe->hard;
500 case XFRM_MSG_ALLOCSPI: {
501 const struct compat_xfrm_userspi_info *src_usi = nlmsg_data(src);
502 struct xfrm_userspi_info *dst_usi = nlmsg_data(dst);
504 /* compat_xfrm_user_polexpire has 4-byte smaller state */
505 memcpy(dst_usi, src_usi, sizeof(src_usi->info));
506 dst_usi->min = src_usi->min;
507 dst_usi->max = src_usi->max;
511 NL_SET_ERR_MSG(extack, "Unsupported message type");
514 pos = dst->nlmsg_len;
516 for (i = 1; i < XFRMA_MAX + 1; i++) {
525 err = xfrm_xlate32_attr(dst, attrs[i], &pos, size, extack);
533 static struct nlmsghdr *xfrm_user_rcv_msg_compat(const struct nlmsghdr *h32,
534 int maxtype, const struct nla_policy *policy,
535 struct netlink_ext_ack *extack)
537 /* netlink_rcv_skb() checks if a message has full (struct nlmsghdr) */
538 u16 type = h32->nlmsg_type - XFRM_MSG_BASE;
539 struct nlattr *attrs[XFRMA_MAX+1];
540 struct nlmsghdr *h64;
544 BUILD_BUG_ON(ARRAY_SIZE(xfrm_msg_min) != ARRAY_SIZE(compat_msg_min));
546 if (type >= ARRAY_SIZE(xfrm_msg_min))
547 return ERR_PTR(-EINVAL);
549 /* Don't call parse: the message might have only nlmsg header */
550 if ((h32->nlmsg_type == XFRM_MSG_GETSA ||
551 h32->nlmsg_type == XFRM_MSG_GETPOLICY) &&
552 (h32->nlmsg_flags & NLM_F_DUMP))
555 err = nlmsg_parse_deprecated(h32, compat_msg_min[type], attrs,
556 maxtype ? : XFRMA_MAX, policy ? : compat_policy, extack);
560 len = xfrm_user_rcv_calculate_len64(h32, attrs);
561 /* The message doesn't need translation */
562 if (len == nlmsg_len(h32))
566 h64 = kvmalloc(len, GFP_KERNEL | __GFP_ZERO);
568 return ERR_PTR(-ENOMEM);
570 err = xfrm_xlate32(h64, h32, attrs, len, type, extack);
579 static int xfrm_user_policy_compat(u8 **pdata32, int optlen)
581 struct compat_xfrm_userpolicy_info *p = (void *)*pdata32;
582 u8 *src_templates, *dst_templates;
585 if (optlen < sizeof(*p))
588 data64 = kmalloc_track_caller(optlen + 4, GFP_USER | __GFP_NOWARN);
592 memcpy(data64, *pdata32, sizeof(*p));
593 memset(data64 + sizeof(*p), 0, 4);
595 src_templates = *pdata32 + sizeof(*p);
596 dst_templates = data64 + sizeof(*p) + 4;
597 memcpy(dst_templates, src_templates, optlen - sizeof(*p));
604 static struct xfrm_translator xfrm_translator = {
605 .owner = THIS_MODULE,
606 .alloc_compat = xfrm_alloc_compat,
607 .rcv_msg_compat = xfrm_user_rcv_msg_compat,
608 .xlate_user_policy_sockptr = xfrm_user_policy_compat,
611 static int __init xfrm_compat_init(void)
613 return xfrm_register_translator(&xfrm_translator);
616 static void __exit xfrm_compat_exit(void)
618 xfrm_unregister_translator(&xfrm_translator);
621 module_init(xfrm_compat_init);
622 module_exit(xfrm_compat_exit);
623 MODULE_LICENSE("GPL");
624 MODULE_AUTHOR("Dmitry Safonov");
625 MODULE_DESCRIPTION("XFRM 32-bit compatibility layer");