Commit | Line | Data |
---|---|---|
09c434b8 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
afd46503 JP |
2 | #define pr_fmt(fmt) "IPsec: " fmt |
3 | ||
38320c70 HX |
4 | #include <crypto/aead.h> |
5 | #include <crypto/authenc.h> | |
6b7326c8 | 6 | #include <linux/err.h> |
1da177e4 LT |
7 | #include <linux/module.h> |
8 | #include <net/ip.h> | |
9 | #include <net/xfrm.h> | |
10 | #include <net/esp.h> | |
72998d8c | 11 | #include <linux/scatterlist.h> |
a02a6422 | 12 | #include <linux/kernel.h> |
1da177e4 | 13 | #include <linux/pfkeyv2.h> |
38320c70 HX |
14 | #include <linux/rtnetlink.h> |
15 | #include <linux/slab.h> | |
b7c6538c | 16 | #include <linux/spinlock.h> |
2017a72c | 17 | #include <linux/in6.h> |
1da177e4 | 18 | #include <net/icmp.h> |
14c85021 | 19 | #include <net/protocol.h> |
1da177e4 | 20 | #include <net/udp.h> |
e27cca96 SD |
21 | #include <net/tcp.h> |
22 | #include <net/espintcp.h> | |
1da177e4 | 23 | |
cac2661c SK |
24 | #include <linux/highmem.h> |
25 | ||
38320c70 HX |
26 | struct esp_skb_cb { |
27 | struct xfrm_skb_cb xfrm; | |
28 | void *tmp; | |
29 | }; | |
30 | ||
962fcef3 HX |
31 | struct esp_output_extra { |
32 | __be32 seqhi; | |
33 | u32 esphoff; | |
34 | }; | |
35 | ||
38320c70 HX |
36 | #define ESP_SKB_CB(__skb) ((struct esp_skb_cb *)&((__skb)->cb[0])) |
37 | ||
38 | /* | |
39 | * Allocate an AEAD request structure with extra space for SG and IV. | |
40 | * | |
41 | * For alignment considerations the IV is placed at the front, followed | |
42 | * by the request and finally the SG list. | |
43 | * | |
44 | * TODO: Use spare space in skb for this where possible. | |
45 | */ | |
962fcef3 | 46 | static void *esp_alloc_tmp(struct crypto_aead *aead, int nfrags, int extralen) |
38320c70 HX |
47 | { |
48 | unsigned int len; | |
49 | ||
962fcef3 | 50 | len = extralen; |
0dc49e9b SK |
51 | |
52 | len += crypto_aead_ivsize(aead); | |
53 | ||
38320c70 HX |
54 | if (len) { |
55 | len += crypto_aead_alignmask(aead) & | |
56 | ~(crypto_tfm_ctx_alignment() - 1); | |
57 | len = ALIGN(len, crypto_tfm_ctx_alignment()); | |
58 | } | |
59 | ||
7021b2e1 | 60 | len += sizeof(struct aead_request) + crypto_aead_reqsize(aead); |
38320c70 HX |
61 | len = ALIGN(len, __alignof__(struct scatterlist)); |
62 | ||
63 | len += sizeof(struct scatterlist) * nfrags; | |
64 | ||
65 | return kmalloc(len, GFP_ATOMIC); | |
66 | } | |
67 | ||
962fcef3 | 68 | static inline void *esp_tmp_extra(void *tmp) |
0dc49e9b | 69 | { |
962fcef3 | 70 | return PTR_ALIGN(tmp, __alignof__(struct esp_output_extra)); |
0dc49e9b | 71 | } |
962fcef3 HX |
72 | |
73 | static inline u8 *esp_tmp_iv(struct crypto_aead *aead, void *tmp, int extralen) | |
38320c70 HX |
74 | { |
75 | return crypto_aead_ivsize(aead) ? | |
962fcef3 HX |
76 | PTR_ALIGN((u8 *)tmp + extralen, |
77 | crypto_aead_alignmask(aead) + 1) : tmp + extralen; | |
38320c70 HX |
78 | } |
79 | ||
38320c70 HX |
80 | static inline struct aead_request *esp_tmp_req(struct crypto_aead *aead, u8 *iv) |
81 | { | |
82 | struct aead_request *req; | |
83 | ||
84 | req = (void *)PTR_ALIGN(iv + crypto_aead_ivsize(aead), | |
85 | crypto_tfm_ctx_alignment()); | |
86 | aead_request_set_tfm(req, aead); | |
87 | return req; | |
88 | } | |
89 | ||
90 | static inline struct scatterlist *esp_req_sg(struct crypto_aead *aead, | |
91 | struct aead_request *req) | |
92 | { | |
93 | return (void *)ALIGN((unsigned long)(req + 1) + | |
94 | crypto_aead_reqsize(aead), | |
95 | __alignof__(struct scatterlist)); | |
96 | } | |
97 | ||
cac2661c SK |
98 | static void esp_ssg_unref(struct xfrm_state *x, void *tmp) |
99 | { | |
100 | struct esp_output_extra *extra = esp_tmp_extra(tmp); | |
101 | struct crypto_aead *aead = x->data; | |
102 | int extralen = 0; | |
103 | u8 *iv; | |
104 | struct aead_request *req; | |
105 | struct scatterlist *sg; | |
106 | ||
107 | if (x->props.flags & XFRM_STATE_ESN) | |
108 | extralen += sizeof(*extra); | |
109 | ||
110 | extra = esp_tmp_extra(tmp); | |
111 | iv = esp_tmp_iv(aead, tmp, extralen); | |
112 | req = esp_tmp_req(aead, iv); | |
113 | ||
114 | /* Unref skb_frag_pages in the src scatterlist if necessary. | |
115 | * Skip the first sg which comes from skb->data. | |
116 | */ | |
117 | if (req->src != req->dst) | |
118 | for (sg = sg_next(req->src); sg; sg = sg_next(sg)) | |
119 | put_page(sg_page(sg)); | |
120 | } | |
121 | ||
e27cca96 SD |
122 | #ifdef CONFIG_INET_ESPINTCP |
123 | struct esp_tcp_sk { | |
124 | struct sock *sk; | |
125 | struct rcu_head rcu; | |
126 | }; | |
127 | ||
128 | static void esp_free_tcp_sk(struct rcu_head *head) | |
129 | { | |
130 | struct esp_tcp_sk *esk = container_of(head, struct esp_tcp_sk, rcu); | |
131 | ||
132 | sock_put(esk->sk); | |
133 | kfree(esk); | |
134 | } | |
135 | ||
136 | static struct sock *esp_find_tcp_sk(struct xfrm_state *x) | |
137 | { | |
138 | struct xfrm_encap_tmpl *encap = x->encap; | |
139 | struct esp_tcp_sk *esk; | |
140 | __be16 sport, dport; | |
141 | struct sock *nsk; | |
142 | struct sock *sk; | |
143 | ||
144 | sk = rcu_dereference(x->encap_sk); | |
145 | if (sk && sk->sk_state == TCP_ESTABLISHED) | |
146 | return sk; | |
147 | ||
148 | spin_lock_bh(&x->lock); | |
149 | sport = encap->encap_sport; | |
150 | dport = encap->encap_dport; | |
151 | nsk = rcu_dereference_protected(x->encap_sk, | |
152 | lockdep_is_held(&x->lock)); | |
153 | if (sk && sk == nsk) { | |
154 | esk = kmalloc(sizeof(*esk), GFP_ATOMIC); | |
155 | if (!esk) { | |
156 | spin_unlock_bh(&x->lock); | |
157 | return ERR_PTR(-ENOMEM); | |
158 | } | |
159 | RCU_INIT_POINTER(x->encap_sk, NULL); | |
160 | esk->sk = sk; | |
161 | call_rcu(&esk->rcu, esp_free_tcp_sk); | |
162 | } | |
163 | spin_unlock_bh(&x->lock); | |
164 | ||
165 | sk = inet_lookup_established(xs_net(x), &tcp_hashinfo, x->id.daddr.a4, | |
166 | dport, x->props.saddr.a4, sport, 0); | |
167 | if (!sk) | |
168 | return ERR_PTR(-ENOENT); | |
169 | ||
170 | if (!tcp_is_ulp_esp(sk)) { | |
171 | sock_put(sk); | |
172 | return ERR_PTR(-EINVAL); | |
173 | } | |
174 | ||
175 | spin_lock_bh(&x->lock); | |
176 | nsk = rcu_dereference_protected(x->encap_sk, | |
177 | lockdep_is_held(&x->lock)); | |
178 | if (encap->encap_sport != sport || | |
179 | encap->encap_dport != dport) { | |
180 | sock_put(sk); | |
181 | sk = nsk ?: ERR_PTR(-EREMCHG); | |
182 | } else if (sk == nsk) { | |
183 | sock_put(sk); | |
184 | } else { | |
185 | rcu_assign_pointer(x->encap_sk, sk); | |
186 | } | |
187 | spin_unlock_bh(&x->lock); | |
188 | ||
189 | return sk; | |
190 | } | |
191 | ||
192 | static int esp_output_tcp_finish(struct xfrm_state *x, struct sk_buff *skb) | |
193 | { | |
194 | struct sock *sk; | |
195 | int err; | |
196 | ||
197 | rcu_read_lock(); | |
198 | ||
199 | sk = esp_find_tcp_sk(x); | |
200 | err = PTR_ERR_OR_ZERO(sk); | |
201 | if (err) | |
202 | goto out; | |
203 | ||
204 | bh_lock_sock(sk); | |
205 | if (sock_owned_by_user(sk)) | |
206 | err = espintcp_queue_out(sk, skb); | |
207 | else | |
208 | err = espintcp_push_skb(sk, skb); | |
209 | bh_unlock_sock(sk); | |
210 | ||
211 | out: | |
212 | rcu_read_unlock(); | |
213 | return err; | |
214 | } | |
215 | ||
216 | static int esp_output_tcp_encap_cb(struct net *net, struct sock *sk, | |
217 | struct sk_buff *skb) | |
218 | { | |
219 | struct dst_entry *dst = skb_dst(skb); | |
220 | struct xfrm_state *x = dst->xfrm; | |
221 | ||
222 | return esp_output_tcp_finish(x, skb); | |
223 | } | |
224 | ||
225 | static int esp_output_tail_tcp(struct xfrm_state *x, struct sk_buff *skb) | |
226 | { | |
227 | int err; | |
228 | ||
229 | local_bh_disable(); | |
230 | err = xfrm_trans_queue_net(xs_net(x), skb, esp_output_tcp_encap_cb); | |
231 | local_bh_enable(); | |
232 | ||
233 | /* EINPROGRESS just happens to do the right thing. It | |
234 | * actually means that the skb has been consumed and | |
235 | * isn't coming back. | |
236 | */ | |
237 | return err ?: -EINPROGRESS; | |
238 | } | |
239 | #else | |
240 | static int esp_output_tail_tcp(struct xfrm_state *x, struct sk_buff *skb) | |
241 | { | |
242 | kfree_skb(skb); | |
243 | ||
244 | return -EOPNOTSUPP; | |
245 | } | |
246 | #endif | |
247 | ||
38320c70 HX |
248 | static void esp_output_done(struct crypto_async_request *base, int err) |
249 | { | |
250 | struct sk_buff *skb = base->data; | |
f53c7239 | 251 | struct xfrm_offload *xo = xfrm_offload(skb); |
cac2661c | 252 | void *tmp; |
f53c7239 SK |
253 | struct xfrm_state *x; |
254 | ||
2294be0f FW |
255 | if (xo && (xo->flags & XFRM_DEV_RESUME)) { |
256 | struct sec_path *sp = skb_sec_path(skb); | |
257 | ||
258 | x = sp->xvec[sp->len - 1]; | |
259 | } else { | |
f53c7239 | 260 | x = skb_dst(skb)->xfrm; |
2294be0f | 261 | } |
38320c70 | 262 | |
cac2661c SK |
263 | tmp = ESP_SKB_CB(skb)->tmp; |
264 | esp_ssg_unref(x, tmp); | |
265 | kfree(tmp); | |
f53c7239 SK |
266 | |
267 | if (xo && (xo->flags & XFRM_DEV_RESUME)) { | |
268 | if (err) { | |
269 | XFRM_INC_STATS(xs_net(x), LINUX_MIB_XFRMOUTSTATEPROTOERROR); | |
270 | kfree_skb(skb); | |
271 | return; | |
272 | } | |
273 | ||
274 | skb_push(skb, skb->data - skb_mac_header(skb)); | |
275 | secpath_reset(skb); | |
276 | xfrm_dev_resume(skb); | |
277 | } else { | |
e27cca96 SD |
278 | if (!err && |
279 | x->encap && x->encap->encap_type == TCP_ENCAP_ESPINTCP) | |
280 | esp_output_tail_tcp(x, skb); | |
281 | else | |
9ab1265d | 282 | xfrm_output_resume(skb->sk, skb, err); |
f53c7239 | 283 | } |
38320c70 HX |
284 | } |
285 | ||
7021b2e1 HX |
286 | /* Move ESP header back into place. */ |
287 | static void esp_restore_header(struct sk_buff *skb, unsigned int offset) | |
288 | { | |
289 | struct ip_esp_hdr *esph = (void *)(skb->data + offset); | |
290 | void *tmp = ESP_SKB_CB(skb)->tmp; | |
962fcef3 | 291 | __be32 *seqhi = esp_tmp_extra(tmp); |
7021b2e1 HX |
292 | |
293 | esph->seq_no = esph->spi; | |
294 | esph->spi = *seqhi; | |
295 | } | |
296 | ||
297 | static void esp_output_restore_header(struct sk_buff *skb) | |
298 | { | |
962fcef3 HX |
299 | void *tmp = ESP_SKB_CB(skb)->tmp; |
300 | struct esp_output_extra *extra = esp_tmp_extra(tmp); | |
301 | ||
302 | esp_restore_header(skb, skb_transport_offset(skb) + extra->esphoff - | |
303 | sizeof(__be32)); | |
7021b2e1 HX |
304 | } |
305 | ||
cac2661c | 306 | static struct ip_esp_hdr *esp_output_set_extra(struct sk_buff *skb, |
fca11ebd | 307 | struct xfrm_state *x, |
cac2661c SK |
308 | struct ip_esp_hdr *esph, |
309 | struct esp_output_extra *extra) | |
310 | { | |
cac2661c SK |
311 | /* For ESN we move the header forward by 4 bytes to |
312 | * accomodate the high bits. We will move it back after | |
313 | * encryption. | |
314 | */ | |
315 | if ((x->props.flags & XFRM_STATE_ESN)) { | |
7862b405 SK |
316 | __u32 seqhi; |
317 | struct xfrm_offload *xo = xfrm_offload(skb); | |
318 | ||
319 | if (xo) | |
320 | seqhi = xo->seq.hi; | |
321 | else | |
322 | seqhi = XFRM_SKB_CB(skb)->seq.output.hi; | |
323 | ||
cac2661c SK |
324 | extra->esphoff = (unsigned char *)esph - |
325 | skb_transport_header(skb); | |
326 | esph = (struct ip_esp_hdr *)((unsigned char *)esph - 4); | |
327 | extra->seqhi = esph->spi; | |
7862b405 | 328 | esph->seq_no = htonl(seqhi); |
cac2661c SK |
329 | } |
330 | ||
331 | esph->spi = x->id.spi; | |
332 | ||
333 | return esph; | |
334 | } | |
335 | ||
7021b2e1 HX |
336 | static void esp_output_done_esn(struct crypto_async_request *base, int err) |
337 | { | |
338 | struct sk_buff *skb = base->data; | |
339 | ||
340 | esp_output_restore_header(skb); | |
341 | esp_output_done(base, err); | |
342 | } | |
343 | ||
eecd227a SD |
344 | static struct ip_esp_hdr *esp_output_udp_encap(struct sk_buff *skb, |
345 | int encap_type, | |
346 | struct esp_info *esp, | |
347 | __be16 sport, | |
348 | __be16 dport) | |
1da177e4 | 349 | { |
fca11ebd SK |
350 | struct udphdr *uh; |
351 | __be32 *udpdata32; | |
8dfb4eba | 352 | unsigned int len; |
fca11ebd | 353 | |
8dfb4eba | 354 | len = skb->len + esp->tailen - skb_transport_offset(skb); |
e27cca96 | 355 | if (len + sizeof(struct iphdr) > IP_MAX_MTU) |
eecd227a | 356 | return ERR_PTR(-EMSGSIZE); |
8dfb4eba | 357 | |
eecd227a | 358 | uh = (struct udphdr *)esp->esph; |
fca11ebd SK |
359 | uh->source = sport; |
360 | uh->dest = dport; | |
8dfb4eba | 361 | uh->len = htons(len); |
fca11ebd SK |
362 | uh->check = 0; |
363 | ||
eecd227a SD |
364 | *skb_mac_header(skb) = IPPROTO_UDP; |
365 | ||
366 | if (encap_type == UDP_ENCAP_ESPINUDP_NON_IKE) { | |
367 | udpdata32 = (__be32 *)(uh + 1); | |
368 | udpdata32[0] = udpdata32[1] = 0; | |
369 | return (struct ip_esp_hdr *)(udpdata32 + 2); | |
370 | } | |
371 | ||
372 | return (struct ip_esp_hdr *)(uh + 1); | |
373 | } | |
374 | ||
e27cca96 SD |
375 | #ifdef CONFIG_INET_ESPINTCP |
376 | static struct ip_esp_hdr *esp_output_tcp_encap(struct xfrm_state *x, | |
377 | struct sk_buff *skb, | |
378 | struct esp_info *esp) | |
379 | { | |
380 | __be16 *lenp = (void *)esp->esph; | |
381 | struct ip_esp_hdr *esph; | |
382 | unsigned int len; | |
383 | struct sock *sk; | |
384 | ||
385 | len = skb->len + esp->tailen - skb_transport_offset(skb); | |
386 | if (len > IP_MAX_MTU) | |
387 | return ERR_PTR(-EMSGSIZE); | |
388 | ||
389 | rcu_read_lock(); | |
390 | sk = esp_find_tcp_sk(x); | |
391 | rcu_read_unlock(); | |
392 | ||
393 | if (IS_ERR(sk)) | |
394 | return ERR_CAST(sk); | |
395 | ||
396 | *lenp = htons(len); | |
397 | esph = (struct ip_esp_hdr *)(lenp + 1); | |
398 | ||
399 | return esph; | |
400 | } | |
401 | #else | |
402 | static struct ip_esp_hdr *esp_output_tcp_encap(struct xfrm_state *x, | |
403 | struct sk_buff *skb, | |
404 | struct esp_info *esp) | |
405 | { | |
406 | return ERR_PTR(-EOPNOTSUPP); | |
407 | } | |
408 | #endif | |
409 | ||
eecd227a SD |
410 | static int esp_output_encap(struct xfrm_state *x, struct sk_buff *skb, |
411 | struct esp_info *esp) | |
412 | { | |
413 | struct xfrm_encap_tmpl *encap = x->encap; | |
414 | struct ip_esp_hdr *esph; | |
415 | __be16 sport, dport; | |
416 | int encap_type; | |
417 | ||
418 | spin_lock_bh(&x->lock); | |
419 | sport = encap->encap_sport; | |
420 | dport = encap->encap_dport; | |
421 | encap_type = encap->encap_type; | |
422 | spin_unlock_bh(&x->lock); | |
423 | ||
fca11ebd SK |
424 | switch (encap_type) { |
425 | default: | |
426 | case UDP_ENCAP_ESPINUDP: | |
fca11ebd | 427 | case UDP_ENCAP_ESPINUDP_NON_IKE: |
eecd227a | 428 | esph = esp_output_udp_encap(skb, encap_type, esp, sport, dport); |
fca11ebd | 429 | break; |
e27cca96 SD |
430 | case TCP_ENCAP_ESPINTCP: |
431 | esph = esp_output_tcp_encap(x, skb, esp); | |
432 | break; | |
d979e20f | 433 | } |
0dc49e9b | 434 | |
eecd227a SD |
435 | if (IS_ERR(esph)) |
436 | return PTR_ERR(esph); | |
437 | ||
fca11ebd | 438 | esp->esph = esph; |
8dfb4eba SD |
439 | |
440 | return 0; | |
fca11ebd | 441 | } |
0dc49e9b | 442 | |
fca11ebd SK |
443 | int esp_output_head(struct xfrm_state *x, struct sk_buff *skb, struct esp_info *esp) |
444 | { | |
445 | u8 *tail; | |
fca11ebd | 446 | int nfrags; |
0e78a873 | 447 | int esph_offset; |
fca11ebd SK |
448 | struct page *page; |
449 | struct sk_buff *trailer; | |
450 | int tailen = esp->tailen; | |
1da177e4 | 451 | |
e27cca96 | 452 | /* this is non-NULL only with TCP/UDP Encapsulation */ |
8dfb4eba | 453 | if (x->encap) { |
eecd227a | 454 | int err = esp_output_encap(x, skb, esp); |
8dfb4eba SD |
455 | |
456 | if (err < 0) | |
457 | return err; | |
458 | } | |
1da177e4 | 459 | |
cac2661c | 460 | if (!skb_cloned(skb)) { |
54ffd790 | 461 | if (tailen <= skb_tailroom(skb)) { |
cac2661c SK |
462 | nfrags = 1; |
463 | trailer = skb; | |
464 | tail = skb_tail_pointer(trailer); | |
1da177e4 | 465 | |
cac2661c SK |
466 | goto skip_cow; |
467 | } else if ((skb_shinfo(skb)->nr_frags < MAX_SKB_FRAGS) | |
468 | && !skb_has_frag_list(skb)) { | |
469 | int allocsize; | |
470 | struct sock *sk = skb->sk; | |
471 | struct page_frag *pfrag = &x->xfrag; | |
7021b2e1 | 472 | |
fca11ebd SK |
473 | esp->inplace = false; |
474 | ||
cac2661c SK |
475 | allocsize = ALIGN(tailen, L1_CACHE_BYTES); |
476 | ||
477 | spin_lock_bh(&x->lock); | |
478 | ||
479 | if (unlikely(!skb_page_frag_refill(allocsize, pfrag, GFP_ATOMIC))) { | |
480 | spin_unlock_bh(&x->lock); | |
481 | goto cow; | |
482 | } | |
483 | ||
484 | page = pfrag->page; | |
485 | get_page(page); | |
486 | ||
9bd6b629 | 487 | tail = page_address(page) + pfrag->offset; |
cac2661c | 488 | |
fca11ebd | 489 | esp_output_fill_trailer(tail, esp->tfclen, esp->plen, esp->proto); |
cac2661c | 490 | |
cac2661c SK |
491 | nfrags = skb_shinfo(skb)->nr_frags; |
492 | ||
493 | __skb_fill_page_desc(skb, nfrags, page, pfrag->offset, | |
494 | tailen); | |
495 | skb_shinfo(skb)->nr_frags = ++nfrags; | |
496 | ||
497 | pfrag->offset = pfrag->offset + allocsize; | |
36ff0dd3 SK |
498 | |
499 | spin_unlock_bh(&x->lock); | |
500 | ||
cac2661c SK |
501 | nfrags++; |
502 | ||
503 | skb->len += tailen; | |
504 | skb->data_len += tailen; | |
505 | skb->truesize += tailen; | |
09db5124 | 506 | if (sk && sk_fullsock(sk)) |
14afee4b | 507 | refcount_add(tailen, &sk->sk_wmem_alloc); |
cac2661c | 508 | |
fca11ebd | 509 | goto out; |
cac2661c | 510 | } |
7021b2e1 HX |
511 | } |
512 | ||
cac2661c | 513 | cow: |
0e78a873 SK |
514 | esph_offset = (unsigned char *)esp->esph - skb_transport_header(skb); |
515 | ||
fca11ebd SK |
516 | nfrags = skb_cow_data(skb, tailen, &trailer); |
517 | if (nfrags < 0) | |
518 | goto out; | |
cac2661c | 519 | tail = skb_tail_pointer(trailer); |
0e78a873 | 520 | esp->esph = (struct ip_esp_hdr *)(skb_transport_header(skb) + esph_offset); |
cac2661c SK |
521 | |
522 | skip_cow: | |
fca11ebd SK |
523 | esp_output_fill_trailer(tail, esp->tfclen, esp->plen, esp->proto); |
524 | pskb_put(skb, trailer, tailen); | |
cac2661c | 525 | |
fca11ebd SK |
526 | out: |
527 | return nfrags; | |
528 | } | |
529 | EXPORT_SYMBOL_GPL(esp_output_head); | |
530 | ||
531 | int esp_output_tail(struct xfrm_state *x, struct sk_buff *skb, struct esp_info *esp) | |
532 | { | |
533 | u8 *iv; | |
534 | int alen; | |
535 | void *tmp; | |
536 | int ivlen; | |
537 | int assoclen; | |
538 | int extralen; | |
539 | struct page *page; | |
540 | struct ip_esp_hdr *esph; | |
541 | struct crypto_aead *aead; | |
542 | struct aead_request *req; | |
543 | struct scatterlist *sg, *dsg; | |
544 | struct esp_output_extra *extra; | |
545 | int err = -ENOMEM; | |
546 | ||
547 | assoclen = sizeof(struct ip_esp_hdr); | |
548 | extralen = 0; | |
549 | ||
550 | if (x->props.flags & XFRM_STATE_ESN) { | |
551 | extralen += sizeof(*extra); | |
552 | assoclen += sizeof(__be32); | |
553 | } | |
7021b2e1 | 554 | |
fca11ebd SK |
555 | aead = x->data; |
556 | alen = crypto_aead_authsize(aead); | |
557 | ivlen = crypto_aead_ivsize(aead); | |
558 | ||
559 | tmp = esp_alloc_tmp(aead, esp->nfrags + 2, extralen); | |
e892d2d4 | 560 | if (!tmp) |
cac2661c | 561 | goto error; |
cac2661c SK |
562 | |
563 | extra = esp_tmp_extra(tmp); | |
564 | iv = esp_tmp_iv(aead, tmp, extralen); | |
565 | req = esp_tmp_req(aead, iv); | |
566 | sg = esp_req_sg(aead, req); | |
cac2661c | 567 | |
fca11ebd SK |
568 | if (esp->inplace) |
569 | dsg = sg; | |
570 | else | |
571 | dsg = &sg[esp->nfrags]; | |
cac2661c | 572 | |
fca11ebd SK |
573 | esph = esp_output_set_extra(skb, x, esp->esph, extra); |
574 | esp->esph = esph; | |
575 | ||
576 | sg_init_table(sg, esp->nfrags); | |
3f297707 JD |
577 | err = skb_to_sgvec(skb, sg, |
578 | (unsigned char *)esph - skb->data, | |
579 | assoclen + ivlen + esp->clen + alen); | |
580 | if (unlikely(err < 0)) | |
e6194923 | 581 | goto error_free; |
fca11ebd SK |
582 | |
583 | if (!esp->inplace) { | |
584 | int allocsize; | |
585 | struct page_frag *pfrag = &x->xfrag; | |
586 | ||
587 | allocsize = ALIGN(skb->data_len, L1_CACHE_BYTES); | |
588 | ||
589 | spin_lock_bh(&x->lock); | |
590 | if (unlikely(!skb_page_frag_refill(allocsize, pfrag, GFP_ATOMIC))) { | |
591 | spin_unlock_bh(&x->lock); | |
e6194923 | 592 | goto error_free; |
fca11ebd SK |
593 | } |
594 | ||
595 | skb_shinfo(skb)->nr_frags = 1; | |
596 | ||
597 | page = pfrag->page; | |
598 | get_page(page); | |
599 | /* replace page frags in skb with new page */ | |
600 | __skb_fill_page_desc(skb, 0, page, pfrag->offset, skb->data_len); | |
601 | pfrag->offset = pfrag->offset + allocsize; | |
602 | spin_unlock_bh(&x->lock); | |
603 | ||
604 | sg_init_table(dsg, skb_shinfo(skb)->nr_frags + 1); | |
3f297707 JD |
605 | err = skb_to_sgvec(skb, dsg, |
606 | (unsigned char *)esph - skb->data, | |
607 | assoclen + ivlen + esp->clen + alen); | |
608 | if (unlikely(err < 0)) | |
e6194923 | 609 | goto error_free; |
fca11ebd | 610 | } |
0dc49e9b | 611 | |
cac2661c SK |
612 | if ((x->props.flags & XFRM_STATE_ESN)) |
613 | aead_request_set_callback(req, 0, esp_output_done_esn, skb); | |
614 | else | |
615 | aead_request_set_callback(req, 0, esp_output_done, skb); | |
616 | ||
fca11ebd | 617 | aead_request_set_crypt(req, sg, dsg, ivlen + esp->clen, iv); |
7021b2e1 HX |
618 | aead_request_set_ad(req, assoclen); |
619 | ||
7021b2e1 | 620 | memset(iv, 0, ivlen); |
fca11ebd | 621 | memcpy(iv + ivlen - min(ivlen, 8), (u8 *)&esp->seqno + 8 - min(ivlen, 8), |
7021b2e1 | 622 | min(ivlen, 8)); |
38320c70 HX |
623 | |
624 | ESP_SKB_CB(skb)->tmp = tmp; | |
7021b2e1 HX |
625 | err = crypto_aead_encrypt(req); |
626 | ||
627 | switch (err) { | |
628 | case -EINPROGRESS: | |
38320c70 | 629 | goto error; |
1da177e4 | 630 | |
068c2e70 | 631 | case -ENOSPC: |
38320c70 | 632 | err = NET_XMIT_DROP; |
7021b2e1 HX |
633 | break; |
634 | ||
635 | case 0: | |
636 | if ((x->props.flags & XFRM_STATE_ESN)) | |
637 | esp_output_restore_header(skb); | |
638 | } | |
1da177e4 | 639 | |
cac2661c SK |
640 | if (sg != dsg) |
641 | esp_ssg_unref(x, tmp); | |
b7c6538c | 642 | |
e27cca96 SD |
643 | if (!err && x->encap && x->encap->encap_type == TCP_ENCAP_ESPINTCP) |
644 | err = esp_output_tail_tcp(x, skb); | |
645 | ||
e6194923 SK |
646 | error_free: |
647 | kfree(tmp); | |
1da177e4 LT |
648 | error: |
649 | return err; | |
650 | } | |
fca11ebd SK |
651 | EXPORT_SYMBOL_GPL(esp_output_tail); |
652 | ||
653 | static int esp_output(struct xfrm_state *x, struct sk_buff *skb) | |
654 | { | |
655 | int alen; | |
656 | int blksize; | |
657 | struct ip_esp_hdr *esph; | |
658 | struct crypto_aead *aead; | |
659 | struct esp_info esp; | |
660 | ||
661 | esp.inplace = true; | |
662 | ||
663 | esp.proto = *skb_mac_header(skb); | |
664 | *skb_mac_header(skb) = IPPROTO_ESP; | |
665 | ||
666 | /* skb is pure payload to encrypt */ | |
667 | ||
668 | aead = x->data; | |
669 | alen = crypto_aead_authsize(aead); | |
670 | ||
671 | esp.tfclen = 0; | |
672 | if (x->tfcpad) { | |
673 | struct xfrm_dst *dst = (struct xfrm_dst *)skb_dst(skb); | |
674 | u32 padto; | |
675 | ||
c7b37c76 | 676 | padto = min(x->tfcpad, xfrm_state_mtu(x, dst->child_mtu_cached)); |
fca11ebd SK |
677 | if (skb->len < padto) |
678 | esp.tfclen = padto - skb->len; | |
679 | } | |
680 | blksize = ALIGN(crypto_aead_blocksize(aead), 4); | |
681 | esp.clen = ALIGN(skb->len + 2 + esp.tfclen, blksize); | |
682 | esp.plen = esp.clen - skb->len - esp.tfclen; | |
683 | esp.tailen = esp.tfclen + esp.plen + alen; | |
684 | ||
685 | esp.esph = ip_esp_hdr(skb); | |
686 | ||
687 | esp.nfrags = esp_output_head(x, skb, &esp); | |
688 | if (esp.nfrags < 0) | |
689 | return esp.nfrags; | |
690 | ||
691 | esph = esp.esph; | |
692 | esph->spi = x->id.spi; | |
693 | ||
694 | esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.low); | |
695 | esp.seqno = cpu_to_be64(XFRM_SKB_CB(skb)->seq.output.low + | |
696 | ((u64)XFRM_SKB_CB(skb)->seq.output.hi << 32)); | |
697 | ||
698 | skb_push(skb, -skb_network_offset(skb)); | |
699 | ||
700 | return esp_output_tail(x, skb, &esp); | |
701 | } | |
1da177e4 | 702 | |
47ebcc0b YK |
703 | static inline int esp_remove_trailer(struct sk_buff *skb) |
704 | { | |
705 | struct xfrm_state *x = xfrm_input_state(skb); | |
706 | struct xfrm_offload *xo = xfrm_offload(skb); | |
707 | struct crypto_aead *aead = x->data; | |
708 | int alen, hlen, elen; | |
709 | int padlen, trimlen; | |
710 | __wsum csumdiff; | |
711 | u8 nexthdr[2]; | |
712 | int ret; | |
713 | ||
714 | alen = crypto_aead_authsize(aead); | |
715 | hlen = sizeof(struct ip_esp_hdr) + crypto_aead_ivsize(aead); | |
716 | elen = skb->len - hlen; | |
717 | ||
718 | if (xo && (xo->flags & XFRM_ESP_NO_TRAILER)) { | |
719 | ret = xo->proto; | |
720 | goto out; | |
721 | } | |
722 | ||
723 | if (skb_copy_bits(skb, skb->len - alen - 2, nexthdr, 2)) | |
724 | BUG(); | |
725 | ||
726 | ret = -EINVAL; | |
727 | padlen = nexthdr[0]; | |
728 | if (padlen + 2 + alen >= elen) { | |
729 | net_dbg_ratelimited("ipsec esp packet is garbage padlen=%d, elen=%d\n", | |
730 | padlen + 2, elen - alen); | |
731 | goto out; | |
732 | } | |
733 | ||
734 | trimlen = alen + padlen + 2; | |
735 | if (skb->ip_summed == CHECKSUM_COMPLETE) { | |
736 | csumdiff = skb_checksum(skb, skb->len - trimlen, trimlen, 0); | |
737 | skb->csum = csum_block_sub(skb->csum, csumdiff, | |
738 | skb->len - trimlen); | |
739 | } | |
740 | pskb_trim(skb, skb->len - trimlen); | |
741 | ||
742 | ret = nexthdr[1]; | |
743 | ||
744 | out: | |
745 | return ret; | |
746 | } | |
747 | ||
fca11ebd | 748 | int esp_input_done2(struct sk_buff *skb, int err) |
1da177e4 | 749 | { |
b71d1d42 | 750 | const struct iphdr *iph; |
38320c70 | 751 | struct xfrm_state *x = xfrm_input_state(skb); |
d77e38e6 | 752 | struct xfrm_offload *xo = xfrm_offload(skb); |
1c5ad13f | 753 | struct crypto_aead *aead = x->data; |
38320c70 | 754 | int hlen = sizeof(struct ip_esp_hdr) + crypto_aead_ivsize(aead); |
31a4ab93 | 755 | int ihl; |
1da177e4 | 756 | |
d77e38e6 SK |
757 | if (!xo || (xo && !(xo->flags & CRYPTO_DONE))) |
758 | kfree(ESP_SKB_CB(skb)->tmp); | |
0ebea8ef | 759 | |
6b7326c8 | 760 | if (unlikely(err)) |
668dc8af | 761 | goto out; |
1da177e4 | 762 | |
47ebcc0b YK |
763 | err = esp_remove_trailer(skb); |
764 | if (unlikely(err < 0)) | |
4bf05ece | 765 | goto out; |
1da177e4 | 766 | |
eddc9ec5 | 767 | iph = ip_hdr(skb); |
31a4ab93 HX |
768 | ihl = iph->ihl * 4; |
769 | ||
752c1f4c HX |
770 | if (x->encap) { |
771 | struct xfrm_encap_tmpl *encap = x->encap; | |
e27cca96 | 772 | struct tcphdr *th = (void *)(skb_network_header(skb) + ihl); |
d56f90a7 | 773 | struct udphdr *uh = (void *)(skb_network_header(skb) + ihl); |
25f6802b SD |
774 | __be16 source; |
775 | ||
776 | switch (x->encap->encap_type) { | |
e27cca96 SD |
777 | case TCP_ENCAP_ESPINTCP: |
778 | source = th->source; | |
779 | break; | |
25f6802b SD |
780 | case UDP_ENCAP_ESPINUDP: |
781 | case UDP_ENCAP_ESPINUDP_NON_IKE: | |
782 | source = uh->source; | |
783 | break; | |
784 | default: | |
785 | WARN_ON_ONCE(1); | |
786 | err = -EINVAL; | |
787 | goto out; | |
788 | } | |
752c1f4c HX |
789 | |
790 | /* | |
791 | * 1) if the NAT-T peer's IP or port changed then | |
792 | * advertize the change to the keying daemon. | |
793 | * This is an inbound SA, so just compare | |
794 | * SRC ports. | |
795 | */ | |
796 | if (iph->saddr != x->props.saddr.a4 || | |
25f6802b | 797 | source != encap->encap_sport) { |
752c1f4c HX |
798 | xfrm_address_t ipaddr; |
799 | ||
800 | ipaddr.a4 = iph->saddr; | |
25f6802b | 801 | km_new_mapping(x, &ipaddr, source); |
e905a9ed | 802 | |
752c1f4c HX |
803 | /* XXX: perhaps add an extra |
804 | * policy check here, to see | |
805 | * if we should allow or | |
806 | * reject a packet from a | |
807 | * different source | |
808 | * address/port. | |
809 | */ | |
1da177e4 | 810 | } |
e905a9ed | 811 | |
752c1f4c HX |
812 | /* |
813 | * 2) ignore UDP/TCP checksums in case | |
814 | * of NAT-T in Transport Mode, or | |
815 | * perform other post-processing fixes | |
816 | * as per draft-ietf-ipsec-udp-encaps-06, | |
817 | * section 3.1.2 | |
818 | */ | |
8bd17075 | 819 | if (x->props.mode == XFRM_MODE_TRANSPORT) |
752c1f4c | 820 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
1da177e4 LT |
821 | } |
822 | ||
ec9567a9 | 823 | skb_pull_rcsum(skb, hlen); |
7143dfac LR |
824 | if (x->props.mode == XFRM_MODE_TUNNEL) |
825 | skb_reset_transport_header(skb); | |
826 | else | |
827 | skb_set_transport_header(skb, -ihl); | |
4bf05ece | 828 | |
38320c70 HX |
829 | /* RFC4303: Drop dummy packets without any error */ |
830 | if (err == IPPROTO_NONE) | |
831 | err = -EINVAL; | |
832 | ||
833 | out: | |
834 | return err; | |
835 | } | |
fca11ebd | 836 | EXPORT_SYMBOL_GPL(esp_input_done2); |
38320c70 HX |
837 | |
838 | static void esp_input_done(struct crypto_async_request *base, int err) | |
839 | { | |
840 | struct sk_buff *skb = base->data; | |
841 | ||
842 | xfrm_input_resume(skb, esp_input_done2(skb, err)); | |
843 | } | |
844 | ||
7021b2e1 HX |
845 | static void esp_input_restore_header(struct sk_buff *skb) |
846 | { | |
847 | esp_restore_header(skb, 0); | |
848 | __skb_pull(skb, 4); | |
849 | } | |
850 | ||
cac2661c SK |
851 | static void esp_input_set_header(struct sk_buff *skb, __be32 *seqhi) |
852 | { | |
853 | struct xfrm_state *x = xfrm_input_state(skb); | |
60aa8046 | 854 | struct ip_esp_hdr *esph; |
cac2661c SK |
855 | |
856 | /* For ESN we move the header forward by 4 bytes to | |
857 | * accomodate the high bits. We will move it back after | |
858 | * decryption. | |
859 | */ | |
860 | if ((x->props.flags & XFRM_STATE_ESN)) { | |
d58ff351 | 861 | esph = skb_push(skb, 4); |
cac2661c SK |
862 | *seqhi = esph->spi; |
863 | esph->spi = esph->seq_no; | |
864 | esph->seq_no = XFRM_SKB_CB(skb)->seq.input.hi; | |
865 | } | |
866 | } | |
867 | ||
7021b2e1 HX |
868 | static void esp_input_done_esn(struct crypto_async_request *base, int err) |
869 | { | |
870 | struct sk_buff *skb = base->data; | |
871 | ||
872 | esp_input_restore_header(skb); | |
873 | esp_input_done(base, err); | |
874 | } | |
875 | ||
38320c70 HX |
876 | /* |
877 | * Note: detecting truncated vs. non-truncated authentication data is very | |
878 | * expensive, so we only support truncated data, which is the recommended | |
879 | * and common case. | |
880 | */ | |
881 | static int esp_input(struct xfrm_state *x, struct sk_buff *skb) | |
882 | { | |
1c5ad13f | 883 | struct crypto_aead *aead = x->data; |
38320c70 HX |
884 | struct aead_request *req; |
885 | struct sk_buff *trailer; | |
7021b2e1 | 886 | int ivlen = crypto_aead_ivsize(aead); |
0c05f983 | 887 | int elen = skb->len - sizeof(struct ip_esp_hdr) - ivlen; |
38320c70 | 888 | int nfrags; |
0dc49e9b | 889 | int assoclen; |
0dc49e9b SK |
890 | int seqhilen; |
891 | __be32 *seqhi; | |
38320c70 HX |
892 | void *tmp; |
893 | u8 *iv; | |
894 | struct scatterlist *sg; | |
38320c70 HX |
895 | int err = -EINVAL; |
896 | ||
0c05f983 | 897 | if (!pskb_may_pull(skb, sizeof(struct ip_esp_hdr) + ivlen)) |
38320c70 HX |
898 | goto out; |
899 | ||
900 | if (elen <= 0) | |
901 | goto out; | |
902 | ||
0c05f983 | 903 | assoclen = sizeof(struct ip_esp_hdr); |
0dc49e9b SK |
904 | seqhilen = 0; |
905 | ||
906 | if (x->props.flags & XFRM_STATE_ESN) { | |
0dc49e9b SK |
907 | seqhilen += sizeof(__be32); |
908 | assoclen += seqhilen; | |
909 | } | |
910 | ||
cac2661c SK |
911 | if (!skb_cloned(skb)) { |
912 | if (!skb_is_nonlinear(skb)) { | |
913 | nfrags = 1; | |
914 | ||
915 | goto skip_cow; | |
916 | } else if (!skb_has_frag_list(skb)) { | |
917 | nfrags = skb_shinfo(skb)->nr_frags; | |
918 | nfrags++; | |
919 | ||
920 | goto skip_cow; | |
921 | } | |
922 | } | |
923 | ||
924 | err = skb_cow_data(skb, 0, &trailer); | |
925 | if (err < 0) | |
926 | goto out; | |
927 | ||
928 | nfrags = err; | |
929 | ||
930 | skip_cow: | |
38320c70 | 931 | err = -ENOMEM; |
7021b2e1 | 932 | tmp = esp_alloc_tmp(aead, nfrags, seqhilen); |
38320c70 HX |
933 | if (!tmp) |
934 | goto out; | |
935 | ||
936 | ESP_SKB_CB(skb)->tmp = tmp; | |
962fcef3 | 937 | seqhi = esp_tmp_extra(tmp); |
0dc49e9b | 938 | iv = esp_tmp_iv(aead, tmp, seqhilen); |
38320c70 | 939 | req = esp_tmp_req(aead, iv); |
7021b2e1 | 940 | sg = esp_req_sg(aead, req); |
38320c70 | 941 | |
cac2661c | 942 | esp_input_set_header(skb, seqhi); |
38320c70 | 943 | |
cac2661c | 944 | sg_init_table(sg, nfrags); |
3f297707 | 945 | err = skb_to_sgvec(skb, sg, 0, skb->len); |
e6194923 SK |
946 | if (unlikely(err < 0)) { |
947 | kfree(tmp); | |
3f297707 | 948 | goto out; |
e6194923 | 949 | } |
38320c70 | 950 | |
cac2661c | 951 | skb->ip_summed = CHECKSUM_NONE; |
0dc49e9b | 952 | |
cac2661c | 953 | if ((x->props.flags & XFRM_STATE_ESN)) |
7021b2e1 | 954 | aead_request_set_callback(req, 0, esp_input_done_esn, skb); |
cac2661c SK |
955 | else |
956 | aead_request_set_callback(req, 0, esp_input_done, skb); | |
7021b2e1 HX |
957 | |
958 | aead_request_set_crypt(req, sg, sg, elen + ivlen, iv); | |
959 | aead_request_set_ad(req, assoclen); | |
38320c70 HX |
960 | |
961 | err = crypto_aead_decrypt(req); | |
962 | if (err == -EINPROGRESS) | |
963 | goto out; | |
964 | ||
7021b2e1 HX |
965 | if ((x->props.flags & XFRM_STATE_ESN)) |
966 | esp_input_restore_header(skb); | |
967 | ||
38320c70 | 968 | err = esp_input_done2(skb, err); |
1da177e4 LT |
969 | |
970 | out: | |
668dc8af | 971 | return err; |
1da177e4 LT |
972 | } |
973 | ||
827789cb | 974 | static int esp4_err(struct sk_buff *skb, u32 info) |
1da177e4 | 975 | { |
4fb236ba | 976 | struct net *net = dev_net(skb->dev); |
b71d1d42 | 977 | const struct iphdr *iph = (const struct iphdr *)skb->data; |
d9319100 | 978 | struct ip_esp_hdr *esph = (struct ip_esp_hdr *)(skb->data+(iph->ihl<<2)); |
1da177e4 LT |
979 | struct xfrm_state *x; |
980 | ||
55be7a9c DM |
981 | switch (icmp_hdr(skb)->type) { |
982 | case ICMP_DEST_UNREACH: | |
983 | if (icmp_hdr(skb)->code != ICMP_FRAG_NEEDED) | |
827789cb | 984 | return 0; |
55be7a9c DM |
985 | case ICMP_REDIRECT: |
986 | break; | |
987 | default: | |
827789cb | 988 | return 0; |
55be7a9c | 989 | } |
1da177e4 | 990 | |
b71d1d42 ED |
991 | x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr, |
992 | esph->spi, IPPROTO_ESP, AF_INET); | |
1da177e4 | 993 | if (!x) |
827789cb | 994 | return 0; |
55be7a9c | 995 | |
387aa65a | 996 | if (icmp_hdr(skb)->type == ICMP_DEST_UNREACH) |
d888f396 | 997 | ipv4_update_pmtu(skb, net, info, 0, IPPROTO_ESP); |
387aa65a | 998 | else |
1042caa7 | 999 | ipv4_redirect(skb, net, 0, IPPROTO_ESP); |
1da177e4 | 1000 | xfrm_state_put(x); |
827789cb SK |
1001 | |
1002 | return 0; | |
1da177e4 LT |
1003 | } |
1004 | ||
1005 | static void esp_destroy(struct xfrm_state *x) | |
1006 | { | |
1c5ad13f | 1007 | struct crypto_aead *aead = x->data; |
1da177e4 | 1008 | |
1c5ad13f | 1009 | if (!aead) |
1da177e4 LT |
1010 | return; |
1011 | ||
1c5ad13f | 1012 | crypto_free_aead(aead); |
1da177e4 LT |
1013 | } |
1014 | ||
1a6509d9 | 1015 | static int esp_init_aead(struct xfrm_state *x) |
1da177e4 | 1016 | { |
7021b2e1 | 1017 | char aead_name[CRYPTO_MAX_ALG_NAME]; |
1a6509d9 HX |
1018 | struct crypto_aead *aead; |
1019 | int err; | |
1020 | ||
7021b2e1 HX |
1021 | err = -ENAMETOOLONG; |
1022 | if (snprintf(aead_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", | |
1023 | x->geniv, x->aead->alg_name) >= CRYPTO_MAX_ALG_NAME) | |
1024 | goto error; | |
1025 | ||
f58869c4 | 1026 | aead = crypto_alloc_aead(aead_name, 0, 0); |
1a6509d9 HX |
1027 | err = PTR_ERR(aead); |
1028 | if (IS_ERR(aead)) | |
1029 | goto error; | |
1030 | ||
1c5ad13f | 1031 | x->data = aead; |
1a6509d9 HX |
1032 | |
1033 | err = crypto_aead_setkey(aead, x->aead->alg_key, | |
1034 | (x->aead->alg_key_len + 7) / 8); | |
1035 | if (err) | |
1036 | goto error; | |
1037 | ||
1038 | err = crypto_aead_setauthsize(aead, x->aead->alg_icv_len / 8); | |
1039 | if (err) | |
1040 | goto error; | |
1041 | ||
1042 | error: | |
1043 | return err; | |
1044 | } | |
1045 | ||
1046 | static int esp_init_authenc(struct xfrm_state *x) | |
1047 | { | |
38320c70 HX |
1048 | struct crypto_aead *aead; |
1049 | struct crypto_authenc_key_param *param; | |
1050 | struct rtattr *rta; | |
1051 | char *key; | |
1052 | char *p; | |
1053 | char authenc_name[CRYPTO_MAX_ALG_NAME]; | |
38320c70 HX |
1054 | unsigned int keylen; |
1055 | int err; | |
1da177e4 | 1056 | |
1a6509d9 | 1057 | err = -EINVAL; |
51456b29 | 1058 | if (!x->ealg) |
1a6509d9 | 1059 | goto error; |
38320c70 | 1060 | |
1a6509d9 | 1061 | err = -ENAMETOOLONG; |
0dc49e9b SK |
1062 | |
1063 | if ((x->props.flags & XFRM_STATE_ESN)) { | |
1064 | if (snprintf(authenc_name, CRYPTO_MAX_ALG_NAME, | |
7021b2e1 HX |
1065 | "%s%sauthencesn(%s,%s)%s", |
1066 | x->geniv ?: "", x->geniv ? "(" : "", | |
0dc49e9b | 1067 | x->aalg ? x->aalg->alg_name : "digest_null", |
7021b2e1 HX |
1068 | x->ealg->alg_name, |
1069 | x->geniv ? ")" : "") >= CRYPTO_MAX_ALG_NAME) | |
0dc49e9b SK |
1070 | goto error; |
1071 | } else { | |
1072 | if (snprintf(authenc_name, CRYPTO_MAX_ALG_NAME, | |
7021b2e1 HX |
1073 | "%s%sauthenc(%s,%s)%s", |
1074 | x->geniv ?: "", x->geniv ? "(" : "", | |
0dc49e9b | 1075 | x->aalg ? x->aalg->alg_name : "digest_null", |
7021b2e1 HX |
1076 | x->ealg->alg_name, |
1077 | x->geniv ? ")" : "") >= CRYPTO_MAX_ALG_NAME) | |
0dc49e9b SK |
1078 | goto error; |
1079 | } | |
38320c70 | 1080 | |
f58869c4 | 1081 | aead = crypto_alloc_aead(authenc_name, 0, 0); |
38320c70 HX |
1082 | err = PTR_ERR(aead); |
1083 | if (IS_ERR(aead)) | |
1084 | goto error; | |
1085 | ||
1c5ad13f | 1086 | x->data = aead; |
38320c70 HX |
1087 | |
1088 | keylen = (x->aalg ? (x->aalg->alg_key_len + 7) / 8 : 0) + | |
1089 | (x->ealg->alg_key_len + 7) / 8 + RTA_SPACE(sizeof(*param)); | |
1090 | err = -ENOMEM; | |
1091 | key = kmalloc(keylen, GFP_KERNEL); | |
1092 | if (!key) | |
1093 | goto error; | |
1094 | ||
1095 | p = key; | |
1096 | rta = (void *)p; | |
1097 | rta->rta_type = CRYPTO_AUTHENC_KEYA_PARAM; | |
1098 | rta->rta_len = RTA_LENGTH(sizeof(*param)); | |
1099 | param = RTA_DATA(rta); | |
1100 | p += RTA_SPACE(sizeof(*param)); | |
1101 | ||
1da177e4 LT |
1102 | if (x->aalg) { |
1103 | struct xfrm_algo_desc *aalg_desc; | |
1104 | ||
38320c70 HX |
1105 | memcpy(p, x->aalg->alg_key, (x->aalg->alg_key_len + 7) / 8); |
1106 | p += (x->aalg->alg_key_len + 7) / 8; | |
1da177e4 LT |
1107 | |
1108 | aalg_desc = xfrm_aalg_get_byname(x->aalg->alg_name, 0); | |
1109 | BUG_ON(!aalg_desc); | |
1110 | ||
38320c70 | 1111 | err = -EINVAL; |
45083497 | 1112 | if (aalg_desc->uinfo.auth.icv_fullbits / 8 != |
38320c70 | 1113 | crypto_aead_authsize(aead)) { |
45083497 JP |
1114 | pr_info("ESP: %s digestsize %u != %hu\n", |
1115 | x->aalg->alg_name, | |
1116 | crypto_aead_authsize(aead), | |
1117 | aalg_desc->uinfo.auth.icv_fullbits / 8); | |
38320c70 | 1118 | goto free_key; |
1da177e4 LT |
1119 | } |
1120 | ||
38320c70 | 1121 | err = crypto_aead_setauthsize( |
8f8a088c | 1122 | aead, x->aalg->alg_trunc_len / 8); |
38320c70 HX |
1123 | if (err) |
1124 | goto free_key; | |
1da177e4 | 1125 | } |
4b7137ff | 1126 | |
38320c70 HX |
1127 | param->enckeylen = cpu_to_be32((x->ealg->alg_key_len + 7) / 8); |
1128 | memcpy(p, x->ealg->alg_key, (x->ealg->alg_key_len + 7) / 8); | |
1129 | ||
1130 | err = crypto_aead_setkey(aead, key, keylen); | |
1131 | ||
1132 | free_key: | |
1133 | kfree(key); | |
1134 | ||
1a6509d9 HX |
1135 | error: |
1136 | return err; | |
1137 | } | |
1138 | ||
1139 | static int esp_init_state(struct xfrm_state *x) | |
1140 | { | |
1a6509d9 HX |
1141 | struct crypto_aead *aead; |
1142 | u32 align; | |
1143 | int err; | |
1144 | ||
1c5ad13f | 1145 | x->data = NULL; |
1a6509d9 HX |
1146 | |
1147 | if (x->aead) | |
1148 | err = esp_init_aead(x); | |
1149 | else | |
1150 | err = esp_init_authenc(x); | |
1151 | ||
38320c70 | 1152 | if (err) |
1da177e4 | 1153 | goto error; |
38320c70 | 1154 | |
1c5ad13f | 1155 | aead = x->data; |
1a6509d9 | 1156 | |
38320c70 HX |
1157 | x->props.header_len = sizeof(struct ip_esp_hdr) + |
1158 | crypto_aead_ivsize(aead); | |
7e49e6de | 1159 | if (x->props.mode == XFRM_MODE_TUNNEL) |
1da177e4 | 1160 | x->props.header_len += sizeof(struct iphdr); |
eb49e630 | 1161 | else if (x->props.mode == XFRM_MODE_BEET && x->sel.family != AF_INET6) |
ac758e3c | 1162 | x->props.header_len += IPV4_BEET_PHMAXLEN; |
1da177e4 LT |
1163 | if (x->encap) { |
1164 | struct xfrm_encap_tmpl *encap = x->encap; | |
1165 | ||
1166 | switch (encap->encap_type) { | |
1167 | default: | |
bcfd09f7 | 1168 | err = -EINVAL; |
1da177e4 LT |
1169 | goto error; |
1170 | case UDP_ENCAP_ESPINUDP: | |
1171 | x->props.header_len += sizeof(struct udphdr); | |
1172 | break; | |
1173 | case UDP_ENCAP_ESPINUDP_NON_IKE: | |
1174 | x->props.header_len += sizeof(struct udphdr) + 2 * sizeof(u32); | |
1175 | break; | |
e27cca96 SD |
1176 | #ifdef CONFIG_INET_ESPINTCP |
1177 | case TCP_ENCAP_ESPINTCP: | |
1178 | /* only the length field, TCP encap is done by | |
1179 | * the socket | |
1180 | */ | |
1181 | x->props.header_len += 2; | |
1182 | break; | |
1183 | #endif | |
1da177e4 LT |
1184 | } |
1185 | } | |
38320c70 HX |
1186 | |
1187 | align = ALIGN(crypto_aead_blocksize(aead), 4); | |
1c5ad13f | 1188 | x->props.trailer_len = align + 1 + crypto_aead_authsize(aead); |
1da177e4 LT |
1189 | |
1190 | error: | |
38320c70 | 1191 | return err; |
1da177e4 LT |
1192 | } |
1193 | ||
827789cb SK |
1194 | static int esp4_rcv_cb(struct sk_buff *skb, int err) |
1195 | { | |
1196 | return 0; | |
1197 | } | |
1198 | ||
533cb5b0 | 1199 | static const struct xfrm_type esp_type = |
1da177e4 LT |
1200 | { |
1201 | .description = "ESP4", | |
1202 | .owner = THIS_MODULE, | |
1203 | .proto = IPPROTO_ESP, | |
436a0a40 | 1204 | .flags = XFRM_TYPE_REPLAY_PROT, |
1da177e4 LT |
1205 | .init_state = esp_init_state, |
1206 | .destructor = esp_destroy, | |
1da177e4 | 1207 | .input = esp_input, |
fca11ebd | 1208 | .output = esp_output, |
1da177e4 LT |
1209 | }; |
1210 | ||
827789cb | 1211 | static struct xfrm4_protocol esp4_protocol = { |
1da177e4 | 1212 | .handler = xfrm4_rcv, |
827789cb SK |
1213 | .input_handler = xfrm_input, |
1214 | .cb_handler = esp4_rcv_cb, | |
1da177e4 | 1215 | .err_handler = esp4_err, |
827789cb | 1216 | .priority = 0, |
1da177e4 LT |
1217 | }; |
1218 | ||
1219 | static int __init esp4_init(void) | |
1220 | { | |
1da177e4 | 1221 | if (xfrm_register_type(&esp_type, AF_INET) < 0) { |
058bd4d2 | 1222 | pr_info("%s: can't add xfrm type\n", __func__); |
1da177e4 LT |
1223 | return -EAGAIN; |
1224 | } | |
827789cb | 1225 | if (xfrm4_protocol_register(&esp4_protocol, IPPROTO_ESP) < 0) { |
058bd4d2 | 1226 | pr_info("%s: can't add protocol\n", __func__); |
1da177e4 LT |
1227 | xfrm_unregister_type(&esp_type, AF_INET); |
1228 | return -EAGAIN; | |
1229 | } | |
1230 | return 0; | |
1231 | } | |
1232 | ||
1233 | static void __exit esp4_fini(void) | |
1234 | { | |
827789cb | 1235 | if (xfrm4_protocol_deregister(&esp4_protocol, IPPROTO_ESP) < 0) |
058bd4d2 | 1236 | pr_info("%s: can't remove protocol\n", __func__); |
4f518e80 | 1237 | xfrm_unregister_type(&esp_type, AF_INET); |
1da177e4 LT |
1238 | } |
1239 | ||
1240 | module_init(esp4_init); | |
1241 | module_exit(esp4_fini); | |
1242 | MODULE_LICENSE("GPL"); | |
d3d6dd3a | 1243 | MODULE_ALIAS_XFRM_TYPE(AF_INET, XFRM_PROTO_ESP); |