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 | { | |
cac2661c SK |
100 | struct crypto_aead *aead = x->data; |
101 | int extralen = 0; | |
102 | u8 *iv; | |
103 | struct aead_request *req; | |
104 | struct scatterlist *sg; | |
105 | ||
106 | if (x->props.flags & XFRM_STATE_ESN) | |
f8fdadef | 107 | extralen += sizeof(struct esp_output_extra); |
cac2661c | 108 | |
cac2661c SK |
109 | iv = esp_tmp_iv(aead, tmp, extralen); |
110 | req = esp_tmp_req(aead, iv); | |
111 | ||
112 | /* Unref skb_frag_pages in the src scatterlist if necessary. | |
113 | * Skip the first sg which comes from skb->data. | |
114 | */ | |
115 | if (req->src != req->dst) | |
116 | for (sg = sg_next(req->src); sg; sg = sg_next(sg)) | |
117 | put_page(sg_page(sg)); | |
118 | } | |
119 | ||
e27cca96 SD |
120 | #ifdef CONFIG_INET_ESPINTCP |
121 | struct esp_tcp_sk { | |
122 | struct sock *sk; | |
123 | struct rcu_head rcu; | |
124 | }; | |
125 | ||
126 | static void esp_free_tcp_sk(struct rcu_head *head) | |
127 | { | |
128 | struct esp_tcp_sk *esk = container_of(head, struct esp_tcp_sk, rcu); | |
129 | ||
130 | sock_put(esk->sk); | |
131 | kfree(esk); | |
132 | } | |
133 | ||
134 | static struct sock *esp_find_tcp_sk(struct xfrm_state *x) | |
135 | { | |
136 | struct xfrm_encap_tmpl *encap = x->encap; | |
4461568a | 137 | struct net *net = xs_net(x); |
e27cca96 SD |
138 | struct esp_tcp_sk *esk; |
139 | __be16 sport, dport; | |
140 | struct sock *nsk; | |
141 | struct sock *sk; | |
142 | ||
143 | sk = rcu_dereference(x->encap_sk); | |
144 | if (sk && sk->sk_state == TCP_ESTABLISHED) | |
145 | return sk; | |
146 | ||
147 | spin_lock_bh(&x->lock); | |
148 | sport = encap->encap_sport; | |
149 | dport = encap->encap_dport; | |
150 | nsk = rcu_dereference_protected(x->encap_sk, | |
151 | lockdep_is_held(&x->lock)); | |
152 | if (sk && sk == nsk) { | |
153 | esk = kmalloc(sizeof(*esk), GFP_ATOMIC); | |
154 | if (!esk) { | |
155 | spin_unlock_bh(&x->lock); | |
156 | return ERR_PTR(-ENOMEM); | |
157 | } | |
158 | RCU_INIT_POINTER(x->encap_sk, NULL); | |
159 | esk->sk = sk; | |
160 | call_rcu(&esk->rcu, esp_free_tcp_sk); | |
161 | } | |
162 | spin_unlock_bh(&x->lock); | |
163 | ||
4461568a | 164 | sk = inet_lookup_established(net, net->ipv4.tcp_death_row.hashinfo, x->id.daddr.a4, |
e27cca96 SD |
165 | dport, x->props.saddr.a4, sport, 0); |
166 | if (!sk) | |
167 | return ERR_PTR(-ENOENT); | |
168 | ||
169 | if (!tcp_is_ulp_esp(sk)) { | |
170 | sock_put(sk); | |
171 | return ERR_PTR(-EINVAL); | |
172 | } | |
173 | ||
174 | spin_lock_bh(&x->lock); | |
175 | nsk = rcu_dereference_protected(x->encap_sk, | |
176 | lockdep_is_held(&x->lock)); | |
177 | if (encap->encap_sport != sport || | |
178 | encap->encap_dport != dport) { | |
179 | sock_put(sk); | |
180 | sk = nsk ?: ERR_PTR(-EREMCHG); | |
181 | } else if (sk == nsk) { | |
182 | sock_put(sk); | |
183 | } else { | |
184 | rcu_assign_pointer(x->encap_sk, sk); | |
185 | } | |
186 | spin_unlock_bh(&x->lock); | |
187 | ||
188 | return sk; | |
189 | } | |
190 | ||
191 | static int esp_output_tcp_finish(struct xfrm_state *x, struct sk_buff *skb) | |
192 | { | |
193 | struct sock *sk; | |
194 | int err; | |
195 | ||
196 | rcu_read_lock(); | |
197 | ||
198 | sk = esp_find_tcp_sk(x); | |
199 | err = PTR_ERR_OR_ZERO(sk); | |
200 | if (err) | |
201 | goto out; | |
202 | ||
203 | bh_lock_sock(sk); | |
204 | if (sock_owned_by_user(sk)) | |
205 | err = espintcp_queue_out(sk, skb); | |
206 | else | |
207 | err = espintcp_push_skb(sk, skb); | |
208 | bh_unlock_sock(sk); | |
209 | ||
210 | out: | |
211 | rcu_read_unlock(); | |
212 | return err; | |
213 | } | |
214 | ||
215 | static int esp_output_tcp_encap_cb(struct net *net, struct sock *sk, | |
216 | struct sk_buff *skb) | |
217 | { | |
218 | struct dst_entry *dst = skb_dst(skb); | |
219 | struct xfrm_state *x = dst->xfrm; | |
220 | ||
221 | return esp_output_tcp_finish(x, skb); | |
222 | } | |
223 | ||
224 | static int esp_output_tail_tcp(struct xfrm_state *x, struct sk_buff *skb) | |
225 | { | |
226 | int err; | |
227 | ||
228 | local_bh_disable(); | |
229 | err = xfrm_trans_queue_net(xs_net(x), skb, esp_output_tcp_encap_cb); | |
230 | local_bh_enable(); | |
231 | ||
232 | /* EINPROGRESS just happens to do the right thing. It | |
233 | * actually means that the skb has been consumed and | |
234 | * isn't coming back. | |
235 | */ | |
236 | return err ?: -EINPROGRESS; | |
237 | } | |
238 | #else | |
239 | static int esp_output_tail_tcp(struct xfrm_state *x, struct sk_buff *skb) | |
240 | { | |
241 | kfree_skb(skb); | |
242 | ||
243 | return -EOPNOTSUPP; | |
244 | } | |
245 | #endif | |
246 | ||
fd5dabf7 | 247 | static void esp_output_done(void *data, int err) |
38320c70 | 248 | { |
fd5dabf7 | 249 | struct sk_buff *skb = data; |
f53c7239 | 250 | struct xfrm_offload *xo = xfrm_offload(skb); |
cac2661c | 251 | void *tmp; |
f53c7239 SK |
252 | struct xfrm_state *x; |
253 | ||
2294be0f FW |
254 | if (xo && (xo->flags & XFRM_DEV_RESUME)) { |
255 | struct sec_path *sp = skb_sec_path(skb); | |
256 | ||
257 | x = sp->xvec[sp->len - 1]; | |
258 | } else { | |
f53c7239 | 259 | x = skb_dst(skb)->xfrm; |
2294be0f | 260 | } |
38320c70 | 261 | |
cac2661c SK |
262 | tmp = ESP_SKB_CB(skb)->tmp; |
263 | esp_ssg_unref(x, tmp); | |
264 | kfree(tmp); | |
f53c7239 SK |
265 | |
266 | if (xo && (xo->flags & XFRM_DEV_RESUME)) { | |
267 | if (err) { | |
268 | XFRM_INC_STATS(xs_net(x), LINUX_MIB_XFRMOUTSTATEPROTOERROR); | |
269 | kfree_skb(skb); | |
270 | return; | |
271 | } | |
272 | ||
273 | skb_push(skb, skb->data - skb_mac_header(skb)); | |
274 | secpath_reset(skb); | |
275 | xfrm_dev_resume(skb); | |
276 | } else { | |
e27cca96 SD |
277 | if (!err && |
278 | x->encap && x->encap->encap_type == TCP_ENCAP_ESPINTCP) | |
279 | esp_output_tail_tcp(x, skb); | |
280 | else | |
9ab1265d | 281 | xfrm_output_resume(skb->sk, skb, err); |
f53c7239 | 282 | } |
38320c70 HX |
283 | } |
284 | ||
7021b2e1 HX |
285 | /* Move ESP header back into place. */ |
286 | static void esp_restore_header(struct sk_buff *skb, unsigned int offset) | |
287 | { | |
288 | struct ip_esp_hdr *esph = (void *)(skb->data + offset); | |
289 | void *tmp = ESP_SKB_CB(skb)->tmp; | |
962fcef3 | 290 | __be32 *seqhi = esp_tmp_extra(tmp); |
7021b2e1 HX |
291 | |
292 | esph->seq_no = esph->spi; | |
293 | esph->spi = *seqhi; | |
294 | } | |
295 | ||
296 | static void esp_output_restore_header(struct sk_buff *skb) | |
297 | { | |
962fcef3 HX |
298 | void *tmp = ESP_SKB_CB(skb)->tmp; |
299 | struct esp_output_extra *extra = esp_tmp_extra(tmp); | |
300 | ||
301 | esp_restore_header(skb, skb_transport_offset(skb) + extra->esphoff - | |
302 | sizeof(__be32)); | |
7021b2e1 HX |
303 | } |
304 | ||
cac2661c | 305 | static struct ip_esp_hdr *esp_output_set_extra(struct sk_buff *skb, |
fca11ebd | 306 | struct xfrm_state *x, |
cac2661c SK |
307 | struct ip_esp_hdr *esph, |
308 | struct esp_output_extra *extra) | |
309 | { | |
cac2661c | 310 | /* For ESN we move the header forward by 4 bytes to |
cbd801b3 | 311 | * accommodate the high bits. We will move it back after |
cac2661c SK |
312 | * encryption. |
313 | */ | |
314 | if ((x->props.flags & XFRM_STATE_ESN)) { | |
7862b405 SK |
315 | __u32 seqhi; |
316 | struct xfrm_offload *xo = xfrm_offload(skb); | |
317 | ||
318 | if (xo) | |
319 | seqhi = xo->seq.hi; | |
320 | else | |
321 | seqhi = XFRM_SKB_CB(skb)->seq.output.hi; | |
322 | ||
cac2661c SK |
323 | extra->esphoff = (unsigned char *)esph - |
324 | skb_transport_header(skb); | |
325 | esph = (struct ip_esp_hdr *)((unsigned char *)esph - 4); | |
326 | extra->seqhi = esph->spi; | |
7862b405 | 327 | esph->seq_no = htonl(seqhi); |
cac2661c SK |
328 | } |
329 | ||
330 | esph->spi = x->id.spi; | |
331 | ||
332 | return esph; | |
333 | } | |
334 | ||
fd5dabf7 | 335 | static void esp_output_done_esn(void *data, int err) |
7021b2e1 | 336 | { |
fd5dabf7 | 337 | struct sk_buff *skb = data; |
7021b2e1 HX |
338 | |
339 | esp_output_restore_header(skb); | |
14d3109c | 340 | esp_output_done(data, err); |
7021b2e1 HX |
341 | } |
342 | ||
eecd227a SD |
343 | static struct ip_esp_hdr *esp_output_udp_encap(struct sk_buff *skb, |
344 | int encap_type, | |
345 | struct esp_info *esp, | |
346 | __be16 sport, | |
347 | __be16 dport) | |
1da177e4 | 348 | { |
fca11ebd SK |
349 | struct udphdr *uh; |
350 | __be32 *udpdata32; | |
8dfb4eba | 351 | unsigned int len; |
fca11ebd | 352 | |
8dfb4eba | 353 | len = skb->len + esp->tailen - skb_transport_offset(skb); |
e27cca96 | 354 | if (len + sizeof(struct iphdr) > IP_MAX_MTU) |
eecd227a | 355 | return ERR_PTR(-EMSGSIZE); |
8dfb4eba | 356 | |
eecd227a | 357 | uh = (struct udphdr *)esp->esph; |
fca11ebd SK |
358 | uh->source = sport; |
359 | uh->dest = dport; | |
8dfb4eba | 360 | uh->len = htons(len); |
fca11ebd SK |
361 | uh->check = 0; |
362 | ||
eecd227a SD |
363 | *skb_mac_header(skb) = IPPROTO_UDP; |
364 | ||
365 | if (encap_type == UDP_ENCAP_ESPINUDP_NON_IKE) { | |
366 | udpdata32 = (__be32 *)(uh + 1); | |
367 | udpdata32[0] = udpdata32[1] = 0; | |
368 | return (struct ip_esp_hdr *)(udpdata32 + 2); | |
369 | } | |
370 | ||
371 | return (struct ip_esp_hdr *)(uh + 1); | |
372 | } | |
373 | ||
e27cca96 SD |
374 | #ifdef CONFIG_INET_ESPINTCP |
375 | static struct ip_esp_hdr *esp_output_tcp_encap(struct xfrm_state *x, | |
376 | struct sk_buff *skb, | |
377 | struct esp_info *esp) | |
378 | { | |
379 | __be16 *lenp = (void *)esp->esph; | |
380 | struct ip_esp_hdr *esph; | |
381 | unsigned int len; | |
382 | struct sock *sk; | |
383 | ||
384 | len = skb->len + esp->tailen - skb_transport_offset(skb); | |
385 | if (len > IP_MAX_MTU) | |
386 | return ERR_PTR(-EMSGSIZE); | |
387 | ||
388 | rcu_read_lock(); | |
389 | sk = esp_find_tcp_sk(x); | |
390 | rcu_read_unlock(); | |
391 | ||
392 | if (IS_ERR(sk)) | |
393 | return ERR_CAST(sk); | |
394 | ||
395 | *lenp = htons(len); | |
396 | esph = (struct ip_esp_hdr *)(lenp + 1); | |
397 | ||
398 | return esph; | |
399 | } | |
400 | #else | |
401 | static struct ip_esp_hdr *esp_output_tcp_encap(struct xfrm_state *x, | |
402 | struct sk_buff *skb, | |
403 | struct esp_info *esp) | |
404 | { | |
405 | return ERR_PTR(-EOPNOTSUPP); | |
406 | } | |
407 | #endif | |
408 | ||
eecd227a SD |
409 | static int esp_output_encap(struct xfrm_state *x, struct sk_buff *skb, |
410 | struct esp_info *esp) | |
411 | { | |
412 | struct xfrm_encap_tmpl *encap = x->encap; | |
413 | struct ip_esp_hdr *esph; | |
414 | __be16 sport, dport; | |
415 | int encap_type; | |
416 | ||
417 | spin_lock_bh(&x->lock); | |
418 | sport = encap->encap_sport; | |
419 | dport = encap->encap_dport; | |
420 | encap_type = encap->encap_type; | |
421 | spin_unlock_bh(&x->lock); | |
422 | ||
fca11ebd SK |
423 | switch (encap_type) { |
424 | default: | |
425 | case UDP_ENCAP_ESPINUDP: | |
fca11ebd | 426 | case UDP_ENCAP_ESPINUDP_NON_IKE: |
eecd227a | 427 | esph = esp_output_udp_encap(skb, encap_type, esp, sport, dport); |
fca11ebd | 428 | break; |
e27cca96 SD |
429 | case TCP_ENCAP_ESPINTCP: |
430 | esph = esp_output_tcp_encap(x, skb, esp); | |
431 | break; | |
d979e20f | 432 | } |
0dc49e9b | 433 | |
eecd227a SD |
434 | if (IS_ERR(esph)) |
435 | return PTR_ERR(esph); | |
436 | ||
fca11ebd | 437 | esp->esph = esph; |
8dfb4eba SD |
438 | |
439 | return 0; | |
fca11ebd | 440 | } |
0dc49e9b | 441 | |
fca11ebd SK |
442 | int esp_output_head(struct xfrm_state *x, struct sk_buff *skb, struct esp_info *esp) |
443 | { | |
444 | u8 *tail; | |
fca11ebd | 445 | int nfrags; |
0e78a873 | 446 | int esph_offset; |
fca11ebd SK |
447 | struct page *page; |
448 | struct sk_buff *trailer; | |
449 | int tailen = esp->tailen; | |
1da177e4 | 450 | |
e27cca96 | 451 | /* this is non-NULL only with TCP/UDP Encapsulation */ |
8dfb4eba | 452 | if (x->encap) { |
eecd227a | 453 | int err = esp_output_encap(x, skb, esp); |
8dfb4eba SD |
454 | |
455 | if (err < 0) | |
456 | return err; | |
457 | } | |
1da177e4 | 458 | |
5bd8baab SD |
459 | if (ALIGN(tailen, L1_CACHE_BYTES) > PAGE_SIZE || |
460 | ALIGN(skb->data_len, L1_CACHE_BYTES) > PAGE_SIZE) | |
ebe48d36 SK |
461 | goto cow; |
462 | ||
cac2661c | 463 | if (!skb_cloned(skb)) { |
54ffd790 | 464 | if (tailen <= skb_tailroom(skb)) { |
cac2661c SK |
465 | nfrags = 1; |
466 | trailer = skb; | |
467 | tail = skb_tail_pointer(trailer); | |
1da177e4 | 468 | |
cac2661c SK |
469 | goto skip_cow; |
470 | } else if ((skb_shinfo(skb)->nr_frags < MAX_SKB_FRAGS) | |
471 | && !skb_has_frag_list(skb)) { | |
472 | int allocsize; | |
473 | struct sock *sk = skb->sk; | |
474 | struct page_frag *pfrag = &x->xfrag; | |
7021b2e1 | 475 | |
fca11ebd SK |
476 | esp->inplace = false; |
477 | ||
cac2661c SK |
478 | allocsize = ALIGN(tailen, L1_CACHE_BYTES); |
479 | ||
480 | spin_lock_bh(&x->lock); | |
481 | ||
482 | if (unlikely(!skb_page_frag_refill(allocsize, pfrag, GFP_ATOMIC))) { | |
483 | spin_unlock_bh(&x->lock); | |
484 | goto cow; | |
485 | } | |
486 | ||
487 | page = pfrag->page; | |
488 | get_page(page); | |
489 | ||
9bd6b629 | 490 | tail = page_address(page) + pfrag->offset; |
cac2661c | 491 | |
fca11ebd | 492 | esp_output_fill_trailer(tail, esp->tfclen, esp->plen, esp->proto); |
cac2661c | 493 | |
cac2661c SK |
494 | nfrags = skb_shinfo(skb)->nr_frags; |
495 | ||
496 | __skb_fill_page_desc(skb, nfrags, page, pfrag->offset, | |
497 | tailen); | |
498 | skb_shinfo(skb)->nr_frags = ++nfrags; | |
499 | ||
500 | pfrag->offset = pfrag->offset + allocsize; | |
36ff0dd3 SK |
501 | |
502 | spin_unlock_bh(&x->lock); | |
503 | ||
cac2661c SK |
504 | nfrags++; |
505 | ||
ede57d58 | 506 | skb_len_add(skb, tailen); |
09db5124 | 507 | if (sk && sk_fullsock(sk)) |
14afee4b | 508 | refcount_add(tailen, &sk->sk_wmem_alloc); |
cac2661c | 509 | |
fca11ebd | 510 | goto out; |
cac2661c | 511 | } |
7021b2e1 HX |
512 | } |
513 | ||
cac2661c | 514 | cow: |
0e78a873 SK |
515 | esph_offset = (unsigned char *)esp->esph - skb_transport_header(skb); |
516 | ||
fca11ebd SK |
517 | nfrags = skb_cow_data(skb, tailen, &trailer); |
518 | if (nfrags < 0) | |
519 | goto out; | |
cac2661c | 520 | tail = skb_tail_pointer(trailer); |
0e78a873 | 521 | esp->esph = (struct ip_esp_hdr *)(skb_transport_header(skb) + esph_offset); |
cac2661c SK |
522 | |
523 | skip_cow: | |
fca11ebd SK |
524 | esp_output_fill_trailer(tail, esp->tfclen, esp->plen, esp->proto); |
525 | pskb_put(skb, trailer, tailen); | |
cac2661c | 526 | |
fca11ebd SK |
527 | out: |
528 | return nfrags; | |
529 | } | |
530 | EXPORT_SYMBOL_GPL(esp_output_head); | |
531 | ||
532 | int esp_output_tail(struct xfrm_state *x, struct sk_buff *skb, struct esp_info *esp) | |
533 | { | |
534 | u8 *iv; | |
535 | int alen; | |
536 | void *tmp; | |
537 | int ivlen; | |
538 | int assoclen; | |
539 | int extralen; | |
540 | struct page *page; | |
541 | struct ip_esp_hdr *esph; | |
542 | struct crypto_aead *aead; | |
543 | struct aead_request *req; | |
544 | struct scatterlist *sg, *dsg; | |
545 | struct esp_output_extra *extra; | |
546 | int err = -ENOMEM; | |
547 | ||
548 | assoclen = sizeof(struct ip_esp_hdr); | |
549 | extralen = 0; | |
550 | ||
551 | if (x->props.flags & XFRM_STATE_ESN) { | |
552 | extralen += sizeof(*extra); | |
553 | assoclen += sizeof(__be32); | |
554 | } | |
7021b2e1 | 555 | |
fca11ebd SK |
556 | aead = x->data; |
557 | alen = crypto_aead_authsize(aead); | |
558 | ivlen = crypto_aead_ivsize(aead); | |
559 | ||
560 | tmp = esp_alloc_tmp(aead, esp->nfrags + 2, extralen); | |
e892d2d4 | 561 | if (!tmp) |
cac2661c | 562 | goto error; |
cac2661c SK |
563 | |
564 | extra = esp_tmp_extra(tmp); | |
565 | iv = esp_tmp_iv(aead, tmp, extralen); | |
566 | req = esp_tmp_req(aead, iv); | |
567 | sg = esp_req_sg(aead, req); | |
cac2661c | 568 | |
fca11ebd SK |
569 | if (esp->inplace) |
570 | dsg = sg; | |
571 | else | |
572 | dsg = &sg[esp->nfrags]; | |
cac2661c | 573 | |
fca11ebd SK |
574 | esph = esp_output_set_extra(skb, x, esp->esph, extra); |
575 | esp->esph = esph; | |
576 | ||
577 | sg_init_table(sg, esp->nfrags); | |
3f297707 JD |
578 | err = skb_to_sgvec(skb, sg, |
579 | (unsigned char *)esph - skb->data, | |
580 | assoclen + ivlen + esp->clen + alen); | |
581 | if (unlikely(err < 0)) | |
e6194923 | 582 | goto error_free; |
fca11ebd SK |
583 | |
584 | if (!esp->inplace) { | |
585 | int allocsize; | |
586 | struct page_frag *pfrag = &x->xfrag; | |
587 | ||
588 | allocsize = ALIGN(skb->data_len, L1_CACHE_BYTES); | |
589 | ||
590 | spin_lock_bh(&x->lock); | |
591 | if (unlikely(!skb_page_frag_refill(allocsize, pfrag, GFP_ATOMIC))) { | |
592 | spin_unlock_bh(&x->lock); | |
e6194923 | 593 | goto error_free; |
fca11ebd SK |
594 | } |
595 | ||
596 | skb_shinfo(skb)->nr_frags = 1; | |
597 | ||
598 | page = pfrag->page; | |
599 | get_page(page); | |
600 | /* replace page frags in skb with new page */ | |
601 | __skb_fill_page_desc(skb, 0, page, pfrag->offset, skb->data_len); | |
602 | pfrag->offset = pfrag->offset + allocsize; | |
603 | spin_unlock_bh(&x->lock); | |
604 | ||
605 | sg_init_table(dsg, skb_shinfo(skb)->nr_frags + 1); | |
3f297707 JD |
606 | err = skb_to_sgvec(skb, dsg, |
607 | (unsigned char *)esph - skb->data, | |
608 | assoclen + ivlen + esp->clen + alen); | |
609 | if (unlikely(err < 0)) | |
e6194923 | 610 | goto error_free; |
fca11ebd | 611 | } |
0dc49e9b | 612 | |
cac2661c SK |
613 | if ((x->props.flags & XFRM_STATE_ESN)) |
614 | aead_request_set_callback(req, 0, esp_output_done_esn, skb); | |
615 | else | |
616 | aead_request_set_callback(req, 0, esp_output_done, skb); | |
617 | ||
fca11ebd | 618 | aead_request_set_crypt(req, sg, dsg, ivlen + esp->clen, iv); |
7021b2e1 HX |
619 | aead_request_set_ad(req, assoclen); |
620 | ||
7021b2e1 | 621 | memset(iv, 0, ivlen); |
fca11ebd | 622 | memcpy(iv + ivlen - min(ivlen, 8), (u8 *)&esp->seqno + 8 - min(ivlen, 8), |
7021b2e1 | 623 | min(ivlen, 8)); |
38320c70 HX |
624 | |
625 | ESP_SKB_CB(skb)->tmp = tmp; | |
7021b2e1 HX |
626 | err = crypto_aead_encrypt(req); |
627 | ||
628 | switch (err) { | |
629 | case -EINPROGRESS: | |
38320c70 | 630 | goto error; |
1da177e4 | 631 | |
068c2e70 | 632 | case -ENOSPC: |
38320c70 | 633 | err = NET_XMIT_DROP; |
7021b2e1 HX |
634 | break; |
635 | ||
636 | case 0: | |
637 | if ((x->props.flags & XFRM_STATE_ESN)) | |
638 | esp_output_restore_header(skb); | |
639 | } | |
1da177e4 | 640 | |
cac2661c SK |
641 | if (sg != dsg) |
642 | esp_ssg_unref(x, tmp); | |
b7c6538c | 643 | |
e27cca96 SD |
644 | if (!err && x->encap && x->encap->encap_type == TCP_ENCAP_ESPINTCP) |
645 | err = esp_output_tail_tcp(x, skb); | |
646 | ||
e6194923 SK |
647 | error_free: |
648 | kfree(tmp); | |
1da177e4 LT |
649 | error: |
650 | return err; | |
651 | } | |
fca11ebd SK |
652 | EXPORT_SYMBOL_GPL(esp_output_tail); |
653 | ||
654 | static int esp_output(struct xfrm_state *x, struct sk_buff *skb) | |
655 | { | |
656 | int alen; | |
657 | int blksize; | |
658 | struct ip_esp_hdr *esph; | |
659 | struct crypto_aead *aead; | |
660 | struct esp_info esp; | |
661 | ||
662 | esp.inplace = true; | |
663 | ||
664 | esp.proto = *skb_mac_header(skb); | |
665 | *skb_mac_header(skb) = IPPROTO_ESP; | |
666 | ||
667 | /* skb is pure payload to encrypt */ | |
668 | ||
669 | aead = x->data; | |
670 | alen = crypto_aead_authsize(aead); | |
671 | ||
672 | esp.tfclen = 0; | |
673 | if (x->tfcpad) { | |
674 | struct xfrm_dst *dst = (struct xfrm_dst *)skb_dst(skb); | |
675 | u32 padto; | |
676 | ||
a6d95c5a | 677 | padto = min(x->tfcpad, xfrm_state_mtu(x, dst->child_mtu_cached)); |
fca11ebd SK |
678 | if (skb->len < padto) |
679 | esp.tfclen = padto - skb->len; | |
680 | } | |
681 | blksize = ALIGN(crypto_aead_blocksize(aead), 4); | |
682 | esp.clen = ALIGN(skb->len + 2 + esp.tfclen, blksize); | |
683 | esp.plen = esp.clen - skb->len - esp.tfclen; | |
684 | esp.tailen = esp.tfclen + esp.plen + alen; | |
685 | ||
686 | esp.esph = ip_esp_hdr(skb); | |
687 | ||
688 | esp.nfrags = esp_output_head(x, skb, &esp); | |
689 | if (esp.nfrags < 0) | |
690 | return esp.nfrags; | |
691 | ||
692 | esph = esp.esph; | |
693 | esph->spi = x->id.spi; | |
694 | ||
695 | esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.low); | |
696 | esp.seqno = cpu_to_be64(XFRM_SKB_CB(skb)->seq.output.low + | |
697 | ((u64)XFRM_SKB_CB(skb)->seq.output.hi << 32)); | |
698 | ||
699 | skb_push(skb, -skb_network_offset(skb)); | |
700 | ||
701 | return esp_output_tail(x, skb, &esp); | |
702 | } | |
1da177e4 | 703 | |
47ebcc0b YK |
704 | static inline int esp_remove_trailer(struct sk_buff *skb) |
705 | { | |
706 | struct xfrm_state *x = xfrm_input_state(skb); | |
47ebcc0b YK |
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 | ||
47ebcc0b YK |
718 | if (skb_copy_bits(skb, skb->len - alen - 2, nexthdr, 2)) |
719 | BUG(); | |
720 | ||
721 | ret = -EINVAL; | |
722 | padlen = nexthdr[0]; | |
723 | if (padlen + 2 + alen >= elen) { | |
724 | net_dbg_ratelimited("ipsec esp packet is garbage padlen=%d, elen=%d\n", | |
725 | padlen + 2, elen - alen); | |
726 | goto out; | |
727 | } | |
728 | ||
729 | trimlen = alen + padlen + 2; | |
730 | if (skb->ip_summed == CHECKSUM_COMPLETE) { | |
731 | csumdiff = skb_checksum(skb, skb->len - trimlen, trimlen, 0); | |
732 | skb->csum = csum_block_sub(skb->csum, csumdiff, | |
733 | skb->len - trimlen); | |
734 | } | |
735 | pskb_trim(skb, skb->len - trimlen); | |
736 | ||
737 | ret = nexthdr[1]; | |
738 | ||
739 | out: | |
740 | return ret; | |
741 | } | |
742 | ||
fca11ebd | 743 | int esp_input_done2(struct sk_buff *skb, int err) |
1da177e4 | 744 | { |
b71d1d42 | 745 | const struct iphdr *iph; |
38320c70 | 746 | struct xfrm_state *x = xfrm_input_state(skb); |
d77e38e6 | 747 | struct xfrm_offload *xo = xfrm_offload(skb); |
1c5ad13f | 748 | struct crypto_aead *aead = x->data; |
38320c70 | 749 | int hlen = sizeof(struct ip_esp_hdr) + crypto_aead_ivsize(aead); |
31a4ab93 | 750 | int ihl; |
1da177e4 | 751 | |
1d9bfacd | 752 | if (!xo || !(xo->flags & CRYPTO_DONE)) |
d77e38e6 | 753 | kfree(ESP_SKB_CB(skb)->tmp); |
0ebea8ef | 754 | |
6b7326c8 | 755 | if (unlikely(err)) |
668dc8af | 756 | goto out; |
1da177e4 | 757 | |
47ebcc0b YK |
758 | err = esp_remove_trailer(skb); |
759 | if (unlikely(err < 0)) | |
4bf05ece | 760 | goto out; |
1da177e4 | 761 | |
eddc9ec5 | 762 | iph = ip_hdr(skb); |
31a4ab93 HX |
763 | ihl = iph->ihl * 4; |
764 | ||
752c1f4c HX |
765 | if (x->encap) { |
766 | struct xfrm_encap_tmpl *encap = x->encap; | |
e27cca96 | 767 | struct tcphdr *th = (void *)(skb_network_header(skb) + ihl); |
d56f90a7 | 768 | struct udphdr *uh = (void *)(skb_network_header(skb) + ihl); |
25f6802b SD |
769 | __be16 source; |
770 | ||
771 | switch (x->encap->encap_type) { | |
e27cca96 SD |
772 | case TCP_ENCAP_ESPINTCP: |
773 | source = th->source; | |
774 | break; | |
25f6802b SD |
775 | case UDP_ENCAP_ESPINUDP: |
776 | case UDP_ENCAP_ESPINUDP_NON_IKE: | |
777 | source = uh->source; | |
778 | break; | |
779 | default: | |
780 | WARN_ON_ONCE(1); | |
781 | err = -EINVAL; | |
782 | goto out; | |
783 | } | |
752c1f4c HX |
784 | |
785 | /* | |
786 | * 1) if the NAT-T peer's IP or port changed then | |
787 | * advertize the change to the keying daemon. | |
788 | * This is an inbound SA, so just compare | |
789 | * SRC ports. | |
790 | */ | |
791 | if (iph->saddr != x->props.saddr.a4 || | |
25f6802b | 792 | source != encap->encap_sport) { |
752c1f4c HX |
793 | xfrm_address_t ipaddr; |
794 | ||
795 | ipaddr.a4 = iph->saddr; | |
25f6802b | 796 | km_new_mapping(x, &ipaddr, source); |
e905a9ed | 797 | |
752c1f4c HX |
798 | /* XXX: perhaps add an extra |
799 | * policy check here, to see | |
800 | * if we should allow or | |
801 | * reject a packet from a | |
802 | * different source | |
803 | * address/port. | |
804 | */ | |
1da177e4 | 805 | } |
e905a9ed | 806 | |
752c1f4c HX |
807 | /* |
808 | * 2) ignore UDP/TCP checksums in case | |
809 | * of NAT-T in Transport Mode, or | |
810 | * perform other post-processing fixes | |
811 | * as per draft-ietf-ipsec-udp-encaps-06, | |
812 | * section 3.1.2 | |
813 | */ | |
8bd17075 | 814 | if (x->props.mode == XFRM_MODE_TRANSPORT) |
752c1f4c | 815 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
1da177e4 LT |
816 | } |
817 | ||
ec9567a9 | 818 | skb_pull_rcsum(skb, hlen); |
7143dfac LR |
819 | if (x->props.mode == XFRM_MODE_TUNNEL) |
820 | skb_reset_transport_header(skb); | |
821 | else | |
822 | skb_set_transport_header(skb, -ihl); | |
4bf05ece | 823 | |
38320c70 HX |
824 | /* RFC4303: Drop dummy packets without any error */ |
825 | if (err == IPPROTO_NONE) | |
826 | err = -EINVAL; | |
827 | ||
828 | out: | |
829 | return err; | |
830 | } | |
fca11ebd | 831 | EXPORT_SYMBOL_GPL(esp_input_done2); |
38320c70 | 832 | |
fd5dabf7 | 833 | static void esp_input_done(void *data, int err) |
38320c70 | 834 | { |
fd5dabf7 | 835 | struct sk_buff *skb = data; |
38320c70 HX |
836 | |
837 | xfrm_input_resume(skb, esp_input_done2(skb, err)); | |
838 | } | |
839 | ||
7021b2e1 HX |
840 | static void esp_input_restore_header(struct sk_buff *skb) |
841 | { | |
842 | esp_restore_header(skb, 0); | |
843 | __skb_pull(skb, 4); | |
844 | } | |
845 | ||
cac2661c SK |
846 | static void esp_input_set_header(struct sk_buff *skb, __be32 *seqhi) |
847 | { | |
848 | struct xfrm_state *x = xfrm_input_state(skb); | |
60aa8046 | 849 | struct ip_esp_hdr *esph; |
cac2661c SK |
850 | |
851 | /* For ESN we move the header forward by 4 bytes to | |
cbd801b3 | 852 | * accommodate the high bits. We will move it back after |
cac2661c SK |
853 | * decryption. |
854 | */ | |
855 | if ((x->props.flags & XFRM_STATE_ESN)) { | |
d58ff351 | 856 | esph = skb_push(skb, 4); |
cac2661c SK |
857 | *seqhi = esph->spi; |
858 | esph->spi = esph->seq_no; | |
859 | esph->seq_no = XFRM_SKB_CB(skb)->seq.input.hi; | |
860 | } | |
861 | } | |
862 | ||
fd5dabf7 | 863 | static void esp_input_done_esn(void *data, int err) |
7021b2e1 | 864 | { |
fd5dabf7 | 865 | struct sk_buff *skb = data; |
7021b2e1 HX |
866 | |
867 | esp_input_restore_header(skb); | |
14d3109c | 868 | esp_input_done(data, err); |
7021b2e1 HX |
869 | } |
870 | ||
38320c70 HX |
871 | /* |
872 | * Note: detecting truncated vs. non-truncated authentication data is very | |
873 | * expensive, so we only support truncated data, which is the recommended | |
874 | * and common case. | |
875 | */ | |
876 | static int esp_input(struct xfrm_state *x, struct sk_buff *skb) | |
877 | { | |
1c5ad13f | 878 | struct crypto_aead *aead = x->data; |
38320c70 HX |
879 | struct aead_request *req; |
880 | struct sk_buff *trailer; | |
7021b2e1 | 881 | int ivlen = crypto_aead_ivsize(aead); |
0c05f983 | 882 | int elen = skb->len - sizeof(struct ip_esp_hdr) - ivlen; |
38320c70 | 883 | int nfrags; |
0dc49e9b | 884 | int assoclen; |
0dc49e9b SK |
885 | int seqhilen; |
886 | __be32 *seqhi; | |
38320c70 HX |
887 | void *tmp; |
888 | u8 *iv; | |
889 | struct scatterlist *sg; | |
38320c70 HX |
890 | int err = -EINVAL; |
891 | ||
0c05f983 | 892 | if (!pskb_may_pull(skb, sizeof(struct ip_esp_hdr) + ivlen)) |
38320c70 HX |
893 | goto out; |
894 | ||
895 | if (elen <= 0) | |
896 | goto out; | |
897 | ||
0c05f983 | 898 | assoclen = sizeof(struct ip_esp_hdr); |
0dc49e9b SK |
899 | seqhilen = 0; |
900 | ||
901 | if (x->props.flags & XFRM_STATE_ESN) { | |
0dc49e9b SK |
902 | seqhilen += sizeof(__be32); |
903 | assoclen += seqhilen; | |
904 | } | |
905 | ||
cac2661c SK |
906 | if (!skb_cloned(skb)) { |
907 | if (!skb_is_nonlinear(skb)) { | |
908 | nfrags = 1; | |
909 | ||
910 | goto skip_cow; | |
911 | } else if (!skb_has_frag_list(skb)) { | |
912 | nfrags = skb_shinfo(skb)->nr_frags; | |
913 | nfrags++; | |
914 | ||
915 | goto skip_cow; | |
916 | } | |
917 | } | |
918 | ||
919 | err = skb_cow_data(skb, 0, &trailer); | |
920 | if (err < 0) | |
921 | goto out; | |
922 | ||
923 | nfrags = err; | |
924 | ||
925 | skip_cow: | |
38320c70 | 926 | err = -ENOMEM; |
7021b2e1 | 927 | tmp = esp_alloc_tmp(aead, nfrags, seqhilen); |
38320c70 HX |
928 | if (!tmp) |
929 | goto out; | |
930 | ||
931 | ESP_SKB_CB(skb)->tmp = tmp; | |
962fcef3 | 932 | seqhi = esp_tmp_extra(tmp); |
0dc49e9b | 933 | iv = esp_tmp_iv(aead, tmp, seqhilen); |
38320c70 | 934 | req = esp_tmp_req(aead, iv); |
7021b2e1 | 935 | sg = esp_req_sg(aead, req); |
38320c70 | 936 | |
cac2661c | 937 | esp_input_set_header(skb, seqhi); |
38320c70 | 938 | |
cac2661c | 939 | sg_init_table(sg, nfrags); |
3f297707 | 940 | err = skb_to_sgvec(skb, sg, 0, skb->len); |
e6194923 SK |
941 | if (unlikely(err < 0)) { |
942 | kfree(tmp); | |
3f297707 | 943 | goto out; |
e6194923 | 944 | } |
38320c70 | 945 | |
cac2661c | 946 | skb->ip_summed = CHECKSUM_NONE; |
0dc49e9b | 947 | |
cac2661c | 948 | if ((x->props.flags & XFRM_STATE_ESN)) |
7021b2e1 | 949 | aead_request_set_callback(req, 0, esp_input_done_esn, skb); |
cac2661c SK |
950 | else |
951 | aead_request_set_callback(req, 0, esp_input_done, skb); | |
7021b2e1 HX |
952 | |
953 | aead_request_set_crypt(req, sg, sg, elen + ivlen, iv); | |
954 | aead_request_set_ad(req, assoclen); | |
38320c70 HX |
955 | |
956 | err = crypto_aead_decrypt(req); | |
957 | if (err == -EINPROGRESS) | |
958 | goto out; | |
959 | ||
7021b2e1 HX |
960 | if ((x->props.flags & XFRM_STATE_ESN)) |
961 | esp_input_restore_header(skb); | |
962 | ||
38320c70 | 963 | err = esp_input_done2(skb, err); |
1da177e4 LT |
964 | |
965 | out: | |
668dc8af | 966 | return err; |
1da177e4 LT |
967 | } |
968 | ||
827789cb | 969 | static int esp4_err(struct sk_buff *skb, u32 info) |
1da177e4 | 970 | { |
4fb236ba | 971 | struct net *net = dev_net(skb->dev); |
b71d1d42 | 972 | const struct iphdr *iph = (const struct iphdr *)skb->data; |
d9319100 | 973 | struct ip_esp_hdr *esph = (struct ip_esp_hdr *)(skb->data+(iph->ihl<<2)); |
1da177e4 LT |
974 | struct xfrm_state *x; |
975 | ||
55be7a9c DM |
976 | switch (icmp_hdr(skb)->type) { |
977 | case ICMP_DEST_UNREACH: | |
978 | if (icmp_hdr(skb)->code != ICMP_FRAG_NEEDED) | |
827789cb | 979 | return 0; |
79121184 | 980 | break; |
55be7a9c DM |
981 | case ICMP_REDIRECT: |
982 | break; | |
983 | default: | |
827789cb | 984 | return 0; |
55be7a9c | 985 | } |
1da177e4 | 986 | |
b71d1d42 ED |
987 | x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr, |
988 | esph->spi, IPPROTO_ESP, AF_INET); | |
1da177e4 | 989 | if (!x) |
827789cb | 990 | return 0; |
55be7a9c | 991 | |
387aa65a | 992 | if (icmp_hdr(skb)->type == ICMP_DEST_UNREACH) |
d888f396 | 993 | ipv4_update_pmtu(skb, net, info, 0, IPPROTO_ESP); |
387aa65a | 994 | else |
1042caa7 | 995 | ipv4_redirect(skb, net, 0, IPPROTO_ESP); |
1da177e4 | 996 | xfrm_state_put(x); |
827789cb SK |
997 | |
998 | return 0; | |
1da177e4 LT |
999 | } |
1000 | ||
1001 | static void esp_destroy(struct xfrm_state *x) | |
1002 | { | |
1c5ad13f | 1003 | struct crypto_aead *aead = x->data; |
1da177e4 | 1004 | |
1c5ad13f | 1005 | if (!aead) |
1da177e4 LT |
1006 | return; |
1007 | ||
1c5ad13f | 1008 | crypto_free_aead(aead); |
1da177e4 LT |
1009 | } |
1010 | ||
67c44f93 | 1011 | static int esp_init_aead(struct xfrm_state *x, struct netlink_ext_ack *extack) |
1da177e4 | 1012 | { |
7021b2e1 | 1013 | char aead_name[CRYPTO_MAX_ALG_NAME]; |
1a6509d9 HX |
1014 | struct crypto_aead *aead; |
1015 | int err; | |
1016 | ||
7021b2e1 | 1017 | if (snprintf(aead_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", |
67c44f93 SD |
1018 | x->geniv, x->aead->alg_name) >= CRYPTO_MAX_ALG_NAME) { |
1019 | NL_SET_ERR_MSG(extack, "Algorithm name is too long"); | |
1020 | return -ENAMETOOLONG; | |
1021 | } | |
7021b2e1 | 1022 | |
f58869c4 | 1023 | aead = crypto_alloc_aead(aead_name, 0, 0); |
1a6509d9 HX |
1024 | err = PTR_ERR(aead); |
1025 | if (IS_ERR(aead)) | |
1026 | goto error; | |
1027 | ||
1c5ad13f | 1028 | x->data = aead; |
1a6509d9 HX |
1029 | |
1030 | err = crypto_aead_setkey(aead, x->aead->alg_key, | |
1031 | (x->aead->alg_key_len + 7) / 8); | |
1032 | if (err) | |
1033 | goto error; | |
1034 | ||
1035 | err = crypto_aead_setauthsize(aead, x->aead->alg_icv_len / 8); | |
1036 | if (err) | |
1037 | goto error; | |
1038 | ||
67c44f93 SD |
1039 | return 0; |
1040 | ||
1a6509d9 | 1041 | error: |
67c44f93 | 1042 | NL_SET_ERR_MSG(extack, "Kernel was unable to initialize cryptographic operations"); |
1a6509d9 HX |
1043 | return err; |
1044 | } | |
1045 | ||
67c44f93 SD |
1046 | static int esp_init_authenc(struct xfrm_state *x, |
1047 | struct netlink_ext_ack *extack) | |
1a6509d9 | 1048 | { |
38320c70 HX |
1049 | struct crypto_aead *aead; |
1050 | struct crypto_authenc_key_param *param; | |
1051 | struct rtattr *rta; | |
1052 | char *key; | |
1053 | char *p; | |
1054 | char authenc_name[CRYPTO_MAX_ALG_NAME]; | |
38320c70 HX |
1055 | unsigned int keylen; |
1056 | int err; | |
1da177e4 | 1057 | |
1a6509d9 | 1058 | err = -ENAMETOOLONG; |
0dc49e9b SK |
1059 | |
1060 | if ((x->props.flags & XFRM_STATE_ESN)) { | |
1061 | if (snprintf(authenc_name, CRYPTO_MAX_ALG_NAME, | |
7021b2e1 HX |
1062 | "%s%sauthencesn(%s,%s)%s", |
1063 | x->geniv ?: "", x->geniv ? "(" : "", | |
0dc49e9b | 1064 | x->aalg ? x->aalg->alg_name : "digest_null", |
7021b2e1 | 1065 | x->ealg->alg_name, |
67c44f93 SD |
1066 | x->geniv ? ")" : "") >= CRYPTO_MAX_ALG_NAME) { |
1067 | NL_SET_ERR_MSG(extack, "Algorithm name is too long"); | |
0dc49e9b | 1068 | goto error; |
67c44f93 | 1069 | } |
0dc49e9b SK |
1070 | } else { |
1071 | if (snprintf(authenc_name, CRYPTO_MAX_ALG_NAME, | |
7021b2e1 HX |
1072 | "%s%sauthenc(%s,%s)%s", |
1073 | x->geniv ?: "", x->geniv ? "(" : "", | |
0dc49e9b | 1074 | x->aalg ? x->aalg->alg_name : "digest_null", |
7021b2e1 | 1075 | x->ealg->alg_name, |
67c44f93 SD |
1076 | x->geniv ? ")" : "") >= CRYPTO_MAX_ALG_NAME) { |
1077 | NL_SET_ERR_MSG(extack, "Algorithm name is too long"); | |
0dc49e9b | 1078 | goto error; |
67c44f93 | 1079 | } |
0dc49e9b | 1080 | } |
38320c70 | 1081 | |
f58869c4 | 1082 | aead = crypto_alloc_aead(authenc_name, 0, 0); |
38320c70 | 1083 | err = PTR_ERR(aead); |
67c44f93 SD |
1084 | if (IS_ERR(aead)) { |
1085 | NL_SET_ERR_MSG(extack, "Kernel was unable to initialize cryptographic operations"); | |
38320c70 | 1086 | goto error; |
67c44f93 | 1087 | } |
38320c70 | 1088 | |
1c5ad13f | 1089 | x->data = aead; |
38320c70 HX |
1090 | |
1091 | keylen = (x->aalg ? (x->aalg->alg_key_len + 7) / 8 : 0) + | |
1092 | (x->ealg->alg_key_len + 7) / 8 + RTA_SPACE(sizeof(*param)); | |
1093 | err = -ENOMEM; | |
1094 | key = kmalloc(keylen, GFP_KERNEL); | |
1095 | if (!key) | |
1096 | goto error; | |
1097 | ||
1098 | p = key; | |
1099 | rta = (void *)p; | |
1100 | rta->rta_type = CRYPTO_AUTHENC_KEYA_PARAM; | |
1101 | rta->rta_len = RTA_LENGTH(sizeof(*param)); | |
1102 | param = RTA_DATA(rta); | |
1103 | p += RTA_SPACE(sizeof(*param)); | |
1104 | ||
1da177e4 LT |
1105 | if (x->aalg) { |
1106 | struct xfrm_algo_desc *aalg_desc; | |
1107 | ||
38320c70 HX |
1108 | memcpy(p, x->aalg->alg_key, (x->aalg->alg_key_len + 7) / 8); |
1109 | p += (x->aalg->alg_key_len + 7) / 8; | |
1da177e4 LT |
1110 | |
1111 | aalg_desc = xfrm_aalg_get_byname(x->aalg->alg_name, 0); | |
1112 | BUG_ON(!aalg_desc); | |
1113 | ||
38320c70 | 1114 | err = -EINVAL; |
45083497 | 1115 | if (aalg_desc->uinfo.auth.icv_fullbits / 8 != |
38320c70 | 1116 | crypto_aead_authsize(aead)) { |
67c44f93 | 1117 | NL_SET_ERR_MSG(extack, "Kernel was unable to initialize cryptographic operations"); |
38320c70 | 1118 | goto free_key; |
1da177e4 LT |
1119 | } |
1120 | ||
38320c70 | 1121 | err = crypto_aead_setauthsize( |
8f8a088c | 1122 | aead, x->aalg->alg_trunc_len / 8); |
67c44f93 SD |
1123 | if (err) { |
1124 | NL_SET_ERR_MSG(extack, "Kernel was unable to initialize cryptographic operations"); | |
38320c70 | 1125 | goto free_key; |
67c44f93 | 1126 | } |
1da177e4 | 1127 | } |
4b7137ff | 1128 | |
38320c70 HX |
1129 | param->enckeylen = cpu_to_be32((x->ealg->alg_key_len + 7) / 8); |
1130 | memcpy(p, x->ealg->alg_key, (x->ealg->alg_key_len + 7) / 8); | |
1131 | ||
1132 | err = crypto_aead_setkey(aead, key, keylen); | |
1133 | ||
1134 | free_key: | |
daa75144 | 1135 | kfree_sensitive(key); |
38320c70 | 1136 | |
1a6509d9 HX |
1137 | error: |
1138 | return err; | |
1139 | } | |
1140 | ||
e1e10b44 | 1141 | static int esp_init_state(struct xfrm_state *x, struct netlink_ext_ack *extack) |
1a6509d9 | 1142 | { |
1a6509d9 HX |
1143 | struct crypto_aead *aead; |
1144 | u32 align; | |
1145 | int err; | |
1146 | ||
1c5ad13f | 1147 | x->data = NULL; |
1a6509d9 | 1148 | |
67c44f93 SD |
1149 | if (x->aead) { |
1150 | err = esp_init_aead(x, extack); | |
1151 | } else if (x->ealg) { | |
1152 | err = esp_init_authenc(x, extack); | |
1153 | } else { | |
1154 | NL_SET_ERR_MSG(extack, "ESP: AEAD or CRYPT must be provided"); | |
1155 | err = -EINVAL; | |
1156 | } | |
1a6509d9 | 1157 | |
38320c70 | 1158 | if (err) |
1da177e4 | 1159 | goto error; |
38320c70 | 1160 | |
1c5ad13f | 1161 | aead = x->data; |
1a6509d9 | 1162 | |
38320c70 HX |
1163 | x->props.header_len = sizeof(struct ip_esp_hdr) + |
1164 | crypto_aead_ivsize(aead); | |
7e49e6de | 1165 | if (x->props.mode == XFRM_MODE_TUNNEL) |
1da177e4 | 1166 | x->props.header_len += sizeof(struct iphdr); |
eb49e630 | 1167 | else if (x->props.mode == XFRM_MODE_BEET && x->sel.family != AF_INET6) |
ac758e3c | 1168 | x->props.header_len += IPV4_BEET_PHMAXLEN; |
1da177e4 LT |
1169 | if (x->encap) { |
1170 | struct xfrm_encap_tmpl *encap = x->encap; | |
1171 | ||
1172 | switch (encap->encap_type) { | |
1173 | default: | |
67c44f93 | 1174 | NL_SET_ERR_MSG(extack, "Unsupported encapsulation type for ESP"); |
bcfd09f7 | 1175 | err = -EINVAL; |
1da177e4 LT |
1176 | goto error; |
1177 | case UDP_ENCAP_ESPINUDP: | |
1178 | x->props.header_len += sizeof(struct udphdr); | |
1179 | break; | |
1180 | case UDP_ENCAP_ESPINUDP_NON_IKE: | |
1181 | x->props.header_len += sizeof(struct udphdr) + 2 * sizeof(u32); | |
1182 | break; | |
e27cca96 SD |
1183 | #ifdef CONFIG_INET_ESPINTCP |
1184 | case TCP_ENCAP_ESPINTCP: | |
1185 | /* only the length field, TCP encap is done by | |
1186 | * the socket | |
1187 | */ | |
1188 | x->props.header_len += 2; | |
1189 | break; | |
1190 | #endif | |
1da177e4 LT |
1191 | } |
1192 | } | |
38320c70 HX |
1193 | |
1194 | align = ALIGN(crypto_aead_blocksize(aead), 4); | |
1c5ad13f | 1195 | x->props.trailer_len = align + 1 + crypto_aead_authsize(aead); |
1da177e4 LT |
1196 | |
1197 | error: | |
38320c70 | 1198 | return err; |
1da177e4 LT |
1199 | } |
1200 | ||
827789cb SK |
1201 | static int esp4_rcv_cb(struct sk_buff *skb, int err) |
1202 | { | |
1203 | return 0; | |
1204 | } | |
1205 | ||
533cb5b0 | 1206 | static const struct xfrm_type esp_type = |
1da177e4 | 1207 | { |
1da177e4 LT |
1208 | .owner = THIS_MODULE, |
1209 | .proto = IPPROTO_ESP, | |
436a0a40 | 1210 | .flags = XFRM_TYPE_REPLAY_PROT, |
1da177e4 LT |
1211 | .init_state = esp_init_state, |
1212 | .destructor = esp_destroy, | |
1da177e4 | 1213 | .input = esp_input, |
fca11ebd | 1214 | .output = esp_output, |
1da177e4 LT |
1215 | }; |
1216 | ||
827789cb | 1217 | static struct xfrm4_protocol esp4_protocol = { |
1da177e4 | 1218 | .handler = xfrm4_rcv, |
827789cb SK |
1219 | .input_handler = xfrm_input, |
1220 | .cb_handler = esp4_rcv_cb, | |
1da177e4 | 1221 | .err_handler = esp4_err, |
827789cb | 1222 | .priority = 0, |
1da177e4 LT |
1223 | }; |
1224 | ||
1225 | static int __init esp4_init(void) | |
1226 | { | |
1da177e4 | 1227 | if (xfrm_register_type(&esp_type, AF_INET) < 0) { |
058bd4d2 | 1228 | pr_info("%s: can't add xfrm type\n", __func__); |
1da177e4 LT |
1229 | return -EAGAIN; |
1230 | } | |
827789cb | 1231 | if (xfrm4_protocol_register(&esp4_protocol, IPPROTO_ESP) < 0) { |
058bd4d2 | 1232 | pr_info("%s: can't add protocol\n", __func__); |
1da177e4 LT |
1233 | xfrm_unregister_type(&esp_type, AF_INET); |
1234 | return -EAGAIN; | |
1235 | } | |
1236 | return 0; | |
1237 | } | |
1238 | ||
1239 | static void __exit esp4_fini(void) | |
1240 | { | |
827789cb | 1241 | if (xfrm4_protocol_deregister(&esp4_protocol, IPPROTO_ESP) < 0) |
058bd4d2 | 1242 | pr_info("%s: can't remove protocol\n", __func__); |
4f518e80 | 1243 | xfrm_unregister_type(&esp_type, AF_INET); |
1da177e4 LT |
1244 | } |
1245 | ||
1246 | module_init(esp4_init); | |
1247 | module_exit(esp4_fini); | |
1248 | MODULE_LICENSE("GPL"); | |
d3d6dd3a | 1249 | MODULE_ALIAS_XFRM_TYPE(AF_INET, XFRM_PROTO_ESP); |