Commit | Line | Data |
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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 LT |
20 | #include <net/udp.h> |
21 | ||
cac2661c SK |
22 | #include <linux/highmem.h> |
23 | ||
38320c70 HX |
24 | struct esp_skb_cb { |
25 | struct xfrm_skb_cb xfrm; | |
26 | void *tmp; | |
27 | }; | |
28 | ||
962fcef3 HX |
29 | struct esp_output_extra { |
30 | __be32 seqhi; | |
31 | u32 esphoff; | |
32 | }; | |
33 | ||
38320c70 HX |
34 | #define ESP_SKB_CB(__skb) ((struct esp_skb_cb *)&((__skb)->cb[0])) |
35 | ||
36 | /* | |
37 | * Allocate an AEAD request structure with extra space for SG and IV. | |
38 | * | |
39 | * For alignment considerations the IV is placed at the front, followed | |
40 | * by the request and finally the SG list. | |
41 | * | |
42 | * TODO: Use spare space in skb for this where possible. | |
43 | */ | |
962fcef3 | 44 | static void *esp_alloc_tmp(struct crypto_aead *aead, int nfrags, int extralen) |
38320c70 HX |
45 | { |
46 | unsigned int len; | |
47 | ||
962fcef3 | 48 | len = extralen; |
0dc49e9b SK |
49 | |
50 | len += crypto_aead_ivsize(aead); | |
51 | ||
38320c70 HX |
52 | if (len) { |
53 | len += crypto_aead_alignmask(aead) & | |
54 | ~(crypto_tfm_ctx_alignment() - 1); | |
55 | len = ALIGN(len, crypto_tfm_ctx_alignment()); | |
56 | } | |
57 | ||
7021b2e1 | 58 | len += sizeof(struct aead_request) + crypto_aead_reqsize(aead); |
38320c70 HX |
59 | len = ALIGN(len, __alignof__(struct scatterlist)); |
60 | ||
61 | len += sizeof(struct scatterlist) * nfrags; | |
62 | ||
63 | return kmalloc(len, GFP_ATOMIC); | |
64 | } | |
65 | ||
962fcef3 | 66 | static inline void *esp_tmp_extra(void *tmp) |
0dc49e9b | 67 | { |
962fcef3 | 68 | return PTR_ALIGN(tmp, __alignof__(struct esp_output_extra)); |
0dc49e9b | 69 | } |
962fcef3 HX |
70 | |
71 | static inline u8 *esp_tmp_iv(struct crypto_aead *aead, void *tmp, int extralen) | |
38320c70 HX |
72 | { |
73 | return crypto_aead_ivsize(aead) ? | |
962fcef3 HX |
74 | PTR_ALIGN((u8 *)tmp + extralen, |
75 | crypto_aead_alignmask(aead) + 1) : tmp + extralen; | |
38320c70 HX |
76 | } |
77 | ||
38320c70 HX |
78 | static inline struct aead_request *esp_tmp_req(struct crypto_aead *aead, u8 *iv) |
79 | { | |
80 | struct aead_request *req; | |
81 | ||
82 | req = (void *)PTR_ALIGN(iv + crypto_aead_ivsize(aead), | |
83 | crypto_tfm_ctx_alignment()); | |
84 | aead_request_set_tfm(req, aead); | |
85 | return req; | |
86 | } | |
87 | ||
88 | static inline struct scatterlist *esp_req_sg(struct crypto_aead *aead, | |
89 | struct aead_request *req) | |
90 | { | |
91 | return (void *)ALIGN((unsigned long)(req + 1) + | |
92 | crypto_aead_reqsize(aead), | |
93 | __alignof__(struct scatterlist)); | |
94 | } | |
95 | ||
cac2661c SK |
96 | static void esp_ssg_unref(struct xfrm_state *x, void *tmp) |
97 | { | |
98 | struct esp_output_extra *extra = esp_tmp_extra(tmp); | |
99 | struct crypto_aead *aead = x->data; | |
100 | int extralen = 0; | |
101 | u8 *iv; | |
102 | struct aead_request *req; | |
103 | struct scatterlist *sg; | |
104 | ||
105 | if (x->props.flags & XFRM_STATE_ESN) | |
106 | extralen += sizeof(*extra); | |
107 | ||
108 | extra = esp_tmp_extra(tmp); | |
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 | ||
38320c70 HX |
120 | static void esp_output_done(struct crypto_async_request *base, int err) |
121 | { | |
122 | struct sk_buff *skb = base->data; | |
f53c7239 | 123 | struct xfrm_offload *xo = xfrm_offload(skb); |
cac2661c | 124 | void *tmp; |
f53c7239 SK |
125 | struct xfrm_state *x; |
126 | ||
2294be0f FW |
127 | if (xo && (xo->flags & XFRM_DEV_RESUME)) { |
128 | struct sec_path *sp = skb_sec_path(skb); | |
129 | ||
130 | x = sp->xvec[sp->len - 1]; | |
131 | } else { | |
f53c7239 | 132 | x = skb_dst(skb)->xfrm; |
2294be0f | 133 | } |
38320c70 | 134 | |
cac2661c SK |
135 | tmp = ESP_SKB_CB(skb)->tmp; |
136 | esp_ssg_unref(x, tmp); | |
137 | kfree(tmp); | |
f53c7239 SK |
138 | |
139 | if (xo && (xo->flags & XFRM_DEV_RESUME)) { | |
140 | if (err) { | |
141 | XFRM_INC_STATS(xs_net(x), LINUX_MIB_XFRMOUTSTATEPROTOERROR); | |
142 | kfree_skb(skb); | |
143 | return; | |
144 | } | |
145 | ||
146 | skb_push(skb, skb->data - skb_mac_header(skb)); | |
147 | secpath_reset(skb); | |
148 | xfrm_dev_resume(skb); | |
149 | } else { | |
150 | xfrm_output_resume(skb, err); | |
151 | } | |
38320c70 HX |
152 | } |
153 | ||
7021b2e1 HX |
154 | /* Move ESP header back into place. */ |
155 | static void esp_restore_header(struct sk_buff *skb, unsigned int offset) | |
156 | { | |
157 | struct ip_esp_hdr *esph = (void *)(skb->data + offset); | |
158 | void *tmp = ESP_SKB_CB(skb)->tmp; | |
962fcef3 | 159 | __be32 *seqhi = esp_tmp_extra(tmp); |
7021b2e1 HX |
160 | |
161 | esph->seq_no = esph->spi; | |
162 | esph->spi = *seqhi; | |
163 | } | |
164 | ||
165 | static void esp_output_restore_header(struct sk_buff *skb) | |
166 | { | |
962fcef3 HX |
167 | void *tmp = ESP_SKB_CB(skb)->tmp; |
168 | struct esp_output_extra *extra = esp_tmp_extra(tmp); | |
169 | ||
170 | esp_restore_header(skb, skb_transport_offset(skb) + extra->esphoff - | |
171 | sizeof(__be32)); | |
7021b2e1 HX |
172 | } |
173 | ||
cac2661c | 174 | static struct ip_esp_hdr *esp_output_set_extra(struct sk_buff *skb, |
fca11ebd | 175 | struct xfrm_state *x, |
cac2661c SK |
176 | struct ip_esp_hdr *esph, |
177 | struct esp_output_extra *extra) | |
178 | { | |
cac2661c SK |
179 | /* For ESN we move the header forward by 4 bytes to |
180 | * accomodate the high bits. We will move it back after | |
181 | * encryption. | |
182 | */ | |
183 | if ((x->props.flags & XFRM_STATE_ESN)) { | |
7862b405 SK |
184 | __u32 seqhi; |
185 | struct xfrm_offload *xo = xfrm_offload(skb); | |
186 | ||
187 | if (xo) | |
188 | seqhi = xo->seq.hi; | |
189 | else | |
190 | seqhi = XFRM_SKB_CB(skb)->seq.output.hi; | |
191 | ||
cac2661c SK |
192 | extra->esphoff = (unsigned char *)esph - |
193 | skb_transport_header(skb); | |
194 | esph = (struct ip_esp_hdr *)((unsigned char *)esph - 4); | |
195 | extra->seqhi = esph->spi; | |
7862b405 | 196 | esph->seq_no = htonl(seqhi); |
cac2661c SK |
197 | } |
198 | ||
199 | esph->spi = x->id.spi; | |
200 | ||
201 | return esph; | |
202 | } | |
203 | ||
7021b2e1 HX |
204 | static void esp_output_done_esn(struct crypto_async_request *base, int err) |
205 | { | |
206 | struct sk_buff *skb = base->data; | |
207 | ||
208 | esp_output_restore_header(skb); | |
209 | esp_output_done(base, err); | |
210 | } | |
211 | ||
eb758c88 SK |
212 | static void esp_output_fill_trailer(u8 *tail, int tfclen, int plen, __u8 proto) |
213 | { | |
214 | /* Fill padding... */ | |
215 | if (tfclen) { | |
216 | memset(tail, 0, tfclen); | |
217 | tail += tfclen; | |
218 | } | |
219 | do { | |
220 | int i; | |
221 | for (i = 0; i < plen - 2; i++) | |
222 | tail[i] = i + 1; | |
223 | } while (0); | |
224 | tail[plen - 2] = plen - 2; | |
225 | tail[plen - 1] = proto; | |
226 | } | |
227 | ||
8dfb4eba | 228 | static int esp_output_udp_encap(struct xfrm_state *x, struct sk_buff *skb, struct esp_info *esp) |
1da177e4 | 229 | { |
fca11ebd SK |
230 | int encap_type; |
231 | struct udphdr *uh; | |
232 | __be32 *udpdata32; | |
233 | __be16 sport, dport; | |
234 | struct xfrm_encap_tmpl *encap = x->encap; | |
235 | struct ip_esp_hdr *esph = esp->esph; | |
8dfb4eba | 236 | unsigned int len; |
fca11ebd SK |
237 | |
238 | spin_lock_bh(&x->lock); | |
239 | sport = encap->encap_sport; | |
240 | dport = encap->encap_dport; | |
241 | encap_type = encap->encap_type; | |
242 | spin_unlock_bh(&x->lock); | |
243 | ||
8dfb4eba SD |
244 | len = skb->len + esp->tailen - skb_transport_offset(skb); |
245 | if (len + sizeof(struct iphdr) >= IP_MAX_MTU) | |
246 | return -EMSGSIZE; | |
247 | ||
fca11ebd SK |
248 | uh = (struct udphdr *)esph; |
249 | uh->source = sport; | |
250 | uh->dest = dport; | |
8dfb4eba | 251 | uh->len = htons(len); |
fca11ebd SK |
252 | uh->check = 0; |
253 | ||
254 | switch (encap_type) { | |
255 | default: | |
256 | case UDP_ENCAP_ESPINUDP: | |
257 | esph = (struct ip_esp_hdr *)(uh + 1); | |
258 | break; | |
259 | case UDP_ENCAP_ESPINUDP_NON_IKE: | |
260 | udpdata32 = (__be32 *)(uh + 1); | |
261 | udpdata32[0] = udpdata32[1] = 0; | |
262 | esph = (struct ip_esp_hdr *)(udpdata32 + 2); | |
263 | break; | |
d979e20f | 264 | } |
0dc49e9b | 265 | |
fca11ebd SK |
266 | *skb_mac_header(skb) = IPPROTO_UDP; |
267 | esp->esph = esph; | |
8dfb4eba SD |
268 | |
269 | return 0; | |
fca11ebd | 270 | } |
0dc49e9b | 271 | |
fca11ebd SK |
272 | int esp_output_head(struct xfrm_state *x, struct sk_buff *skb, struct esp_info *esp) |
273 | { | |
274 | u8 *tail; | |
275 | u8 *vaddr; | |
276 | int nfrags; | |
0e78a873 | 277 | int esph_offset; |
fca11ebd SK |
278 | struct page *page; |
279 | struct sk_buff *trailer; | |
280 | int tailen = esp->tailen; | |
1da177e4 LT |
281 | |
282 | /* this is non-NULL only with UDP Encapsulation */ | |
8dfb4eba SD |
283 | if (x->encap) { |
284 | int err = esp_output_udp_encap(x, skb, esp); | |
285 | ||
286 | if (err < 0) | |
287 | return err; | |
288 | } | |
1da177e4 | 289 | |
cac2661c | 290 | if (!skb_cloned(skb)) { |
54ffd790 | 291 | if (tailen <= skb_tailroom(skb)) { |
cac2661c SK |
292 | nfrags = 1; |
293 | trailer = skb; | |
294 | tail = skb_tail_pointer(trailer); | |
1da177e4 | 295 | |
cac2661c SK |
296 | goto skip_cow; |
297 | } else if ((skb_shinfo(skb)->nr_frags < MAX_SKB_FRAGS) | |
298 | && !skb_has_frag_list(skb)) { | |
299 | int allocsize; | |
300 | struct sock *sk = skb->sk; | |
301 | struct page_frag *pfrag = &x->xfrag; | |
7021b2e1 | 302 | |
fca11ebd SK |
303 | esp->inplace = false; |
304 | ||
cac2661c SK |
305 | allocsize = ALIGN(tailen, L1_CACHE_BYTES); |
306 | ||
307 | spin_lock_bh(&x->lock); | |
308 | ||
309 | if (unlikely(!skb_page_frag_refill(allocsize, pfrag, GFP_ATOMIC))) { | |
310 | spin_unlock_bh(&x->lock); | |
311 | goto cow; | |
312 | } | |
313 | ||
314 | page = pfrag->page; | |
315 | get_page(page); | |
316 | ||
317 | vaddr = kmap_atomic(page); | |
318 | ||
319 | tail = vaddr + pfrag->offset; | |
320 | ||
fca11ebd | 321 | esp_output_fill_trailer(tail, esp->tfclen, esp->plen, esp->proto); |
cac2661c SK |
322 | |
323 | kunmap_atomic(vaddr); | |
324 | ||
325 | nfrags = skb_shinfo(skb)->nr_frags; | |
326 | ||
327 | __skb_fill_page_desc(skb, nfrags, page, pfrag->offset, | |
328 | tailen); | |
329 | skb_shinfo(skb)->nr_frags = ++nfrags; | |
330 | ||
331 | pfrag->offset = pfrag->offset + allocsize; | |
36ff0dd3 SK |
332 | |
333 | spin_unlock_bh(&x->lock); | |
334 | ||
cac2661c SK |
335 | nfrags++; |
336 | ||
337 | skb->len += tailen; | |
338 | skb->data_len += tailen; | |
339 | skb->truesize += tailen; | |
09db5124 | 340 | if (sk && sk_fullsock(sk)) |
14afee4b | 341 | refcount_add(tailen, &sk->sk_wmem_alloc); |
cac2661c | 342 | |
fca11ebd | 343 | goto out; |
cac2661c | 344 | } |
7021b2e1 HX |
345 | } |
346 | ||
cac2661c | 347 | cow: |
0e78a873 SK |
348 | esph_offset = (unsigned char *)esp->esph - skb_transport_header(skb); |
349 | ||
fca11ebd SK |
350 | nfrags = skb_cow_data(skb, tailen, &trailer); |
351 | if (nfrags < 0) | |
352 | goto out; | |
cac2661c | 353 | tail = skb_tail_pointer(trailer); |
0e78a873 | 354 | esp->esph = (struct ip_esp_hdr *)(skb_transport_header(skb) + esph_offset); |
cac2661c SK |
355 | |
356 | skip_cow: | |
fca11ebd SK |
357 | esp_output_fill_trailer(tail, esp->tfclen, esp->plen, esp->proto); |
358 | pskb_put(skb, trailer, tailen); | |
cac2661c | 359 | |
fca11ebd SK |
360 | out: |
361 | return nfrags; | |
362 | } | |
363 | EXPORT_SYMBOL_GPL(esp_output_head); | |
364 | ||
365 | int esp_output_tail(struct xfrm_state *x, struct sk_buff *skb, struct esp_info *esp) | |
366 | { | |
367 | u8 *iv; | |
368 | int alen; | |
369 | void *tmp; | |
370 | int ivlen; | |
371 | int assoclen; | |
372 | int extralen; | |
373 | struct page *page; | |
374 | struct ip_esp_hdr *esph; | |
375 | struct crypto_aead *aead; | |
376 | struct aead_request *req; | |
377 | struct scatterlist *sg, *dsg; | |
378 | struct esp_output_extra *extra; | |
379 | int err = -ENOMEM; | |
380 | ||
381 | assoclen = sizeof(struct ip_esp_hdr); | |
382 | extralen = 0; | |
383 | ||
384 | if (x->props.flags & XFRM_STATE_ESN) { | |
385 | extralen += sizeof(*extra); | |
386 | assoclen += sizeof(__be32); | |
387 | } | |
7021b2e1 | 388 | |
fca11ebd SK |
389 | aead = x->data; |
390 | alen = crypto_aead_authsize(aead); | |
391 | ivlen = crypto_aead_ivsize(aead); | |
392 | ||
393 | tmp = esp_alloc_tmp(aead, esp->nfrags + 2, extralen); | |
e892d2d4 | 394 | if (!tmp) |
cac2661c | 395 | goto error; |
cac2661c SK |
396 | |
397 | extra = esp_tmp_extra(tmp); | |
398 | iv = esp_tmp_iv(aead, tmp, extralen); | |
399 | req = esp_tmp_req(aead, iv); | |
400 | sg = esp_req_sg(aead, req); | |
cac2661c | 401 | |
fca11ebd SK |
402 | if (esp->inplace) |
403 | dsg = sg; | |
404 | else | |
405 | dsg = &sg[esp->nfrags]; | |
cac2661c | 406 | |
fca11ebd SK |
407 | esph = esp_output_set_extra(skb, x, esp->esph, extra); |
408 | esp->esph = esph; | |
409 | ||
410 | sg_init_table(sg, esp->nfrags); | |
3f297707 JD |
411 | err = skb_to_sgvec(skb, sg, |
412 | (unsigned char *)esph - skb->data, | |
413 | assoclen + ivlen + esp->clen + alen); | |
414 | if (unlikely(err < 0)) | |
e6194923 | 415 | goto error_free; |
fca11ebd SK |
416 | |
417 | if (!esp->inplace) { | |
418 | int allocsize; | |
419 | struct page_frag *pfrag = &x->xfrag; | |
420 | ||
421 | allocsize = ALIGN(skb->data_len, L1_CACHE_BYTES); | |
422 | ||
423 | spin_lock_bh(&x->lock); | |
424 | if (unlikely(!skb_page_frag_refill(allocsize, pfrag, GFP_ATOMIC))) { | |
425 | spin_unlock_bh(&x->lock); | |
e6194923 | 426 | goto error_free; |
fca11ebd SK |
427 | } |
428 | ||
429 | skb_shinfo(skb)->nr_frags = 1; | |
430 | ||
431 | page = pfrag->page; | |
432 | get_page(page); | |
433 | /* replace page frags in skb with new page */ | |
434 | __skb_fill_page_desc(skb, 0, page, pfrag->offset, skb->data_len); | |
435 | pfrag->offset = pfrag->offset + allocsize; | |
436 | spin_unlock_bh(&x->lock); | |
437 | ||
438 | sg_init_table(dsg, skb_shinfo(skb)->nr_frags + 1); | |
3f297707 JD |
439 | err = skb_to_sgvec(skb, dsg, |
440 | (unsigned char *)esph - skb->data, | |
441 | assoclen + ivlen + esp->clen + alen); | |
442 | if (unlikely(err < 0)) | |
e6194923 | 443 | goto error_free; |
fca11ebd | 444 | } |
0dc49e9b | 445 | |
cac2661c SK |
446 | if ((x->props.flags & XFRM_STATE_ESN)) |
447 | aead_request_set_callback(req, 0, esp_output_done_esn, skb); | |
448 | else | |
449 | aead_request_set_callback(req, 0, esp_output_done, skb); | |
450 | ||
fca11ebd | 451 | aead_request_set_crypt(req, sg, dsg, ivlen + esp->clen, iv); |
7021b2e1 HX |
452 | aead_request_set_ad(req, assoclen); |
453 | ||
7021b2e1 | 454 | memset(iv, 0, ivlen); |
fca11ebd | 455 | memcpy(iv + ivlen - min(ivlen, 8), (u8 *)&esp->seqno + 8 - min(ivlen, 8), |
7021b2e1 | 456 | min(ivlen, 8)); |
38320c70 HX |
457 | |
458 | ESP_SKB_CB(skb)->tmp = tmp; | |
7021b2e1 HX |
459 | err = crypto_aead_encrypt(req); |
460 | ||
461 | switch (err) { | |
462 | case -EINPROGRESS: | |
38320c70 | 463 | goto error; |
1da177e4 | 464 | |
068c2e70 | 465 | case -ENOSPC: |
38320c70 | 466 | err = NET_XMIT_DROP; |
7021b2e1 HX |
467 | break; |
468 | ||
469 | case 0: | |
470 | if ((x->props.flags & XFRM_STATE_ESN)) | |
471 | esp_output_restore_header(skb); | |
472 | } | |
1da177e4 | 473 | |
cac2661c SK |
474 | if (sg != dsg) |
475 | esp_ssg_unref(x, tmp); | |
b7c6538c | 476 | |
e6194923 SK |
477 | error_free: |
478 | kfree(tmp); | |
1da177e4 LT |
479 | error: |
480 | return err; | |
481 | } | |
fca11ebd SK |
482 | EXPORT_SYMBOL_GPL(esp_output_tail); |
483 | ||
484 | static int esp_output(struct xfrm_state *x, struct sk_buff *skb) | |
485 | { | |
486 | int alen; | |
487 | int blksize; | |
488 | struct ip_esp_hdr *esph; | |
489 | struct crypto_aead *aead; | |
490 | struct esp_info esp; | |
491 | ||
492 | esp.inplace = true; | |
493 | ||
494 | esp.proto = *skb_mac_header(skb); | |
495 | *skb_mac_header(skb) = IPPROTO_ESP; | |
496 | ||
497 | /* skb is pure payload to encrypt */ | |
498 | ||
499 | aead = x->data; | |
500 | alen = crypto_aead_authsize(aead); | |
501 | ||
502 | esp.tfclen = 0; | |
503 | if (x->tfcpad) { | |
504 | struct xfrm_dst *dst = (struct xfrm_dst *)skb_dst(skb); | |
505 | u32 padto; | |
506 | ||
c7b37c76 | 507 | padto = min(x->tfcpad, xfrm_state_mtu(x, dst->child_mtu_cached)); |
fca11ebd SK |
508 | if (skb->len < padto) |
509 | esp.tfclen = padto - skb->len; | |
510 | } | |
511 | blksize = ALIGN(crypto_aead_blocksize(aead), 4); | |
512 | esp.clen = ALIGN(skb->len + 2 + esp.tfclen, blksize); | |
513 | esp.plen = esp.clen - skb->len - esp.tfclen; | |
514 | esp.tailen = esp.tfclen + esp.plen + alen; | |
515 | ||
516 | esp.esph = ip_esp_hdr(skb); | |
517 | ||
518 | esp.nfrags = esp_output_head(x, skb, &esp); | |
519 | if (esp.nfrags < 0) | |
520 | return esp.nfrags; | |
521 | ||
522 | esph = esp.esph; | |
523 | esph->spi = x->id.spi; | |
524 | ||
525 | esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.low); | |
526 | esp.seqno = cpu_to_be64(XFRM_SKB_CB(skb)->seq.output.low + | |
527 | ((u64)XFRM_SKB_CB(skb)->seq.output.hi << 32)); | |
528 | ||
529 | skb_push(skb, -skb_network_offset(skb)); | |
530 | ||
531 | return esp_output_tail(x, skb, &esp); | |
532 | } | |
1da177e4 | 533 | |
47ebcc0b YK |
534 | static inline int esp_remove_trailer(struct sk_buff *skb) |
535 | { | |
536 | struct xfrm_state *x = xfrm_input_state(skb); | |
537 | struct xfrm_offload *xo = xfrm_offload(skb); | |
538 | struct crypto_aead *aead = x->data; | |
539 | int alen, hlen, elen; | |
540 | int padlen, trimlen; | |
541 | __wsum csumdiff; | |
542 | u8 nexthdr[2]; | |
543 | int ret; | |
544 | ||
545 | alen = crypto_aead_authsize(aead); | |
546 | hlen = sizeof(struct ip_esp_hdr) + crypto_aead_ivsize(aead); | |
547 | elen = skb->len - hlen; | |
548 | ||
549 | if (xo && (xo->flags & XFRM_ESP_NO_TRAILER)) { | |
550 | ret = xo->proto; | |
551 | goto out; | |
552 | } | |
553 | ||
554 | if (skb_copy_bits(skb, skb->len - alen - 2, nexthdr, 2)) | |
555 | BUG(); | |
556 | ||
557 | ret = -EINVAL; | |
558 | padlen = nexthdr[0]; | |
559 | if (padlen + 2 + alen >= elen) { | |
560 | net_dbg_ratelimited("ipsec esp packet is garbage padlen=%d, elen=%d\n", | |
561 | padlen + 2, elen - alen); | |
562 | goto out; | |
563 | } | |
564 | ||
565 | trimlen = alen + padlen + 2; | |
566 | if (skb->ip_summed == CHECKSUM_COMPLETE) { | |
567 | csumdiff = skb_checksum(skb, skb->len - trimlen, trimlen, 0); | |
568 | skb->csum = csum_block_sub(skb->csum, csumdiff, | |
569 | skb->len - trimlen); | |
570 | } | |
571 | pskb_trim(skb, skb->len - trimlen); | |
572 | ||
573 | ret = nexthdr[1]; | |
574 | ||
575 | out: | |
576 | return ret; | |
577 | } | |
578 | ||
fca11ebd | 579 | int esp_input_done2(struct sk_buff *skb, int err) |
1da177e4 | 580 | { |
b71d1d42 | 581 | const struct iphdr *iph; |
38320c70 | 582 | struct xfrm_state *x = xfrm_input_state(skb); |
d77e38e6 | 583 | struct xfrm_offload *xo = xfrm_offload(skb); |
1c5ad13f | 584 | struct crypto_aead *aead = x->data; |
38320c70 | 585 | int hlen = sizeof(struct ip_esp_hdr) + crypto_aead_ivsize(aead); |
31a4ab93 | 586 | int ihl; |
1da177e4 | 587 | |
d77e38e6 SK |
588 | if (!xo || (xo && !(xo->flags & CRYPTO_DONE))) |
589 | kfree(ESP_SKB_CB(skb)->tmp); | |
0ebea8ef | 590 | |
6b7326c8 | 591 | if (unlikely(err)) |
668dc8af | 592 | goto out; |
1da177e4 | 593 | |
47ebcc0b YK |
594 | err = esp_remove_trailer(skb); |
595 | if (unlikely(err < 0)) | |
4bf05ece | 596 | goto out; |
1da177e4 | 597 | |
eddc9ec5 | 598 | iph = ip_hdr(skb); |
31a4ab93 HX |
599 | ihl = iph->ihl * 4; |
600 | ||
752c1f4c HX |
601 | if (x->encap) { |
602 | struct xfrm_encap_tmpl *encap = x->encap; | |
d56f90a7 | 603 | struct udphdr *uh = (void *)(skb_network_header(skb) + ihl); |
752c1f4c HX |
604 | |
605 | /* | |
606 | * 1) if the NAT-T peer's IP or port changed then | |
607 | * advertize the change to the keying daemon. | |
608 | * This is an inbound SA, so just compare | |
609 | * SRC ports. | |
610 | */ | |
611 | if (iph->saddr != x->props.saddr.a4 || | |
612 | uh->source != encap->encap_sport) { | |
613 | xfrm_address_t ipaddr; | |
614 | ||
615 | ipaddr.a4 = iph->saddr; | |
616 | km_new_mapping(x, &ipaddr, uh->source); | |
e905a9ed | 617 | |
752c1f4c HX |
618 | /* XXX: perhaps add an extra |
619 | * policy check here, to see | |
620 | * if we should allow or | |
621 | * reject a packet from a | |
622 | * different source | |
623 | * address/port. | |
624 | */ | |
1da177e4 | 625 | } |
e905a9ed | 626 | |
752c1f4c HX |
627 | /* |
628 | * 2) ignore UDP/TCP checksums in case | |
629 | * of NAT-T in Transport Mode, or | |
630 | * perform other post-processing fixes | |
631 | * as per draft-ietf-ipsec-udp-encaps-06, | |
632 | * section 3.1.2 | |
633 | */ | |
8bd17075 | 634 | if (x->props.mode == XFRM_MODE_TRANSPORT) |
752c1f4c | 635 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
1da177e4 LT |
636 | } |
637 | ||
ec9567a9 | 638 | skb_pull_rcsum(skb, hlen); |
7143dfac LR |
639 | if (x->props.mode == XFRM_MODE_TUNNEL) |
640 | skb_reset_transport_header(skb); | |
641 | else | |
642 | skb_set_transport_header(skb, -ihl); | |
4bf05ece | 643 | |
38320c70 HX |
644 | /* RFC4303: Drop dummy packets without any error */ |
645 | if (err == IPPROTO_NONE) | |
646 | err = -EINVAL; | |
647 | ||
648 | out: | |
649 | return err; | |
650 | } | |
fca11ebd | 651 | EXPORT_SYMBOL_GPL(esp_input_done2); |
38320c70 HX |
652 | |
653 | static void esp_input_done(struct crypto_async_request *base, int err) | |
654 | { | |
655 | struct sk_buff *skb = base->data; | |
656 | ||
657 | xfrm_input_resume(skb, esp_input_done2(skb, err)); | |
658 | } | |
659 | ||
7021b2e1 HX |
660 | static void esp_input_restore_header(struct sk_buff *skb) |
661 | { | |
662 | esp_restore_header(skb, 0); | |
663 | __skb_pull(skb, 4); | |
664 | } | |
665 | ||
cac2661c SK |
666 | static void esp_input_set_header(struct sk_buff *skb, __be32 *seqhi) |
667 | { | |
668 | struct xfrm_state *x = xfrm_input_state(skb); | |
60aa8046 | 669 | struct ip_esp_hdr *esph; |
cac2661c SK |
670 | |
671 | /* For ESN we move the header forward by 4 bytes to | |
672 | * accomodate the high bits. We will move it back after | |
673 | * decryption. | |
674 | */ | |
675 | if ((x->props.flags & XFRM_STATE_ESN)) { | |
d58ff351 | 676 | esph = skb_push(skb, 4); |
cac2661c SK |
677 | *seqhi = esph->spi; |
678 | esph->spi = esph->seq_no; | |
679 | esph->seq_no = XFRM_SKB_CB(skb)->seq.input.hi; | |
680 | } | |
681 | } | |
682 | ||
7021b2e1 HX |
683 | static void esp_input_done_esn(struct crypto_async_request *base, int err) |
684 | { | |
685 | struct sk_buff *skb = base->data; | |
686 | ||
687 | esp_input_restore_header(skb); | |
688 | esp_input_done(base, err); | |
689 | } | |
690 | ||
38320c70 HX |
691 | /* |
692 | * Note: detecting truncated vs. non-truncated authentication data is very | |
693 | * expensive, so we only support truncated data, which is the recommended | |
694 | * and common case. | |
695 | */ | |
696 | static int esp_input(struct xfrm_state *x, struct sk_buff *skb) | |
697 | { | |
1c5ad13f | 698 | struct crypto_aead *aead = x->data; |
38320c70 HX |
699 | struct aead_request *req; |
700 | struct sk_buff *trailer; | |
7021b2e1 | 701 | int ivlen = crypto_aead_ivsize(aead); |
0c05f983 | 702 | int elen = skb->len - sizeof(struct ip_esp_hdr) - ivlen; |
38320c70 | 703 | int nfrags; |
0dc49e9b | 704 | int assoclen; |
0dc49e9b SK |
705 | int seqhilen; |
706 | __be32 *seqhi; | |
38320c70 HX |
707 | void *tmp; |
708 | u8 *iv; | |
709 | struct scatterlist *sg; | |
38320c70 HX |
710 | int err = -EINVAL; |
711 | ||
0c05f983 | 712 | if (!pskb_may_pull(skb, sizeof(struct ip_esp_hdr) + ivlen)) |
38320c70 HX |
713 | goto out; |
714 | ||
715 | if (elen <= 0) | |
716 | goto out; | |
717 | ||
0c05f983 | 718 | assoclen = sizeof(struct ip_esp_hdr); |
0dc49e9b SK |
719 | seqhilen = 0; |
720 | ||
721 | if (x->props.flags & XFRM_STATE_ESN) { | |
0dc49e9b SK |
722 | seqhilen += sizeof(__be32); |
723 | assoclen += seqhilen; | |
724 | } | |
725 | ||
cac2661c SK |
726 | if (!skb_cloned(skb)) { |
727 | if (!skb_is_nonlinear(skb)) { | |
728 | nfrags = 1; | |
729 | ||
730 | goto skip_cow; | |
731 | } else if (!skb_has_frag_list(skb)) { | |
732 | nfrags = skb_shinfo(skb)->nr_frags; | |
733 | nfrags++; | |
734 | ||
735 | goto skip_cow; | |
736 | } | |
737 | } | |
738 | ||
739 | err = skb_cow_data(skb, 0, &trailer); | |
740 | if (err < 0) | |
741 | goto out; | |
742 | ||
743 | nfrags = err; | |
744 | ||
745 | skip_cow: | |
38320c70 | 746 | err = -ENOMEM; |
7021b2e1 | 747 | tmp = esp_alloc_tmp(aead, nfrags, seqhilen); |
38320c70 HX |
748 | if (!tmp) |
749 | goto out; | |
750 | ||
751 | ESP_SKB_CB(skb)->tmp = tmp; | |
962fcef3 | 752 | seqhi = esp_tmp_extra(tmp); |
0dc49e9b | 753 | iv = esp_tmp_iv(aead, tmp, seqhilen); |
38320c70 | 754 | req = esp_tmp_req(aead, iv); |
7021b2e1 | 755 | sg = esp_req_sg(aead, req); |
38320c70 | 756 | |
cac2661c | 757 | esp_input_set_header(skb, seqhi); |
38320c70 | 758 | |
cac2661c | 759 | sg_init_table(sg, nfrags); |
3f297707 | 760 | err = skb_to_sgvec(skb, sg, 0, skb->len); |
e6194923 SK |
761 | if (unlikely(err < 0)) { |
762 | kfree(tmp); | |
3f297707 | 763 | goto out; |
e6194923 | 764 | } |
38320c70 | 765 | |
cac2661c | 766 | skb->ip_summed = CHECKSUM_NONE; |
0dc49e9b | 767 | |
cac2661c | 768 | if ((x->props.flags & XFRM_STATE_ESN)) |
7021b2e1 | 769 | aead_request_set_callback(req, 0, esp_input_done_esn, skb); |
cac2661c SK |
770 | else |
771 | aead_request_set_callback(req, 0, esp_input_done, skb); | |
7021b2e1 HX |
772 | |
773 | aead_request_set_crypt(req, sg, sg, elen + ivlen, iv); | |
774 | aead_request_set_ad(req, assoclen); | |
38320c70 HX |
775 | |
776 | err = crypto_aead_decrypt(req); | |
777 | if (err == -EINPROGRESS) | |
778 | goto out; | |
779 | ||
7021b2e1 HX |
780 | if ((x->props.flags & XFRM_STATE_ESN)) |
781 | esp_input_restore_header(skb); | |
782 | ||
38320c70 | 783 | err = esp_input_done2(skb, err); |
1da177e4 LT |
784 | |
785 | out: | |
668dc8af | 786 | return err; |
1da177e4 LT |
787 | } |
788 | ||
827789cb | 789 | static int esp4_err(struct sk_buff *skb, u32 info) |
1da177e4 | 790 | { |
4fb236ba | 791 | struct net *net = dev_net(skb->dev); |
b71d1d42 | 792 | const struct iphdr *iph = (const struct iphdr *)skb->data; |
d9319100 | 793 | struct ip_esp_hdr *esph = (struct ip_esp_hdr *)(skb->data+(iph->ihl<<2)); |
1da177e4 LT |
794 | struct xfrm_state *x; |
795 | ||
55be7a9c DM |
796 | switch (icmp_hdr(skb)->type) { |
797 | case ICMP_DEST_UNREACH: | |
798 | if (icmp_hdr(skb)->code != ICMP_FRAG_NEEDED) | |
827789cb | 799 | return 0; |
55be7a9c DM |
800 | case ICMP_REDIRECT: |
801 | break; | |
802 | default: | |
827789cb | 803 | return 0; |
55be7a9c | 804 | } |
1da177e4 | 805 | |
b71d1d42 ED |
806 | x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr, |
807 | esph->spi, IPPROTO_ESP, AF_INET); | |
1da177e4 | 808 | if (!x) |
827789cb | 809 | return 0; |
55be7a9c | 810 | |
387aa65a | 811 | if (icmp_hdr(skb)->type == ICMP_DEST_UNREACH) |
d888f396 | 812 | ipv4_update_pmtu(skb, net, info, 0, IPPROTO_ESP); |
387aa65a | 813 | else |
1042caa7 | 814 | ipv4_redirect(skb, net, 0, IPPROTO_ESP); |
1da177e4 | 815 | xfrm_state_put(x); |
827789cb SK |
816 | |
817 | return 0; | |
1da177e4 LT |
818 | } |
819 | ||
820 | static void esp_destroy(struct xfrm_state *x) | |
821 | { | |
1c5ad13f | 822 | struct crypto_aead *aead = x->data; |
1da177e4 | 823 | |
1c5ad13f | 824 | if (!aead) |
1da177e4 LT |
825 | return; |
826 | ||
1c5ad13f | 827 | crypto_free_aead(aead); |
1da177e4 LT |
828 | } |
829 | ||
1a6509d9 | 830 | static int esp_init_aead(struct xfrm_state *x) |
1da177e4 | 831 | { |
7021b2e1 | 832 | char aead_name[CRYPTO_MAX_ALG_NAME]; |
1a6509d9 HX |
833 | struct crypto_aead *aead; |
834 | int err; | |
835 | ||
7021b2e1 HX |
836 | err = -ENAMETOOLONG; |
837 | if (snprintf(aead_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", | |
838 | x->geniv, x->aead->alg_name) >= CRYPTO_MAX_ALG_NAME) | |
839 | goto error; | |
840 | ||
f58869c4 | 841 | aead = crypto_alloc_aead(aead_name, 0, 0); |
1a6509d9 HX |
842 | err = PTR_ERR(aead); |
843 | if (IS_ERR(aead)) | |
844 | goto error; | |
845 | ||
1c5ad13f | 846 | x->data = aead; |
1a6509d9 HX |
847 | |
848 | err = crypto_aead_setkey(aead, x->aead->alg_key, | |
849 | (x->aead->alg_key_len + 7) / 8); | |
850 | if (err) | |
851 | goto error; | |
852 | ||
853 | err = crypto_aead_setauthsize(aead, x->aead->alg_icv_len / 8); | |
854 | if (err) | |
855 | goto error; | |
856 | ||
857 | error: | |
858 | return err; | |
859 | } | |
860 | ||
861 | static int esp_init_authenc(struct xfrm_state *x) | |
862 | { | |
38320c70 HX |
863 | struct crypto_aead *aead; |
864 | struct crypto_authenc_key_param *param; | |
865 | struct rtattr *rta; | |
866 | char *key; | |
867 | char *p; | |
868 | char authenc_name[CRYPTO_MAX_ALG_NAME]; | |
38320c70 HX |
869 | unsigned int keylen; |
870 | int err; | |
1da177e4 | 871 | |
1a6509d9 | 872 | err = -EINVAL; |
51456b29 | 873 | if (!x->ealg) |
1a6509d9 | 874 | goto error; |
38320c70 | 875 | |
1a6509d9 | 876 | err = -ENAMETOOLONG; |
0dc49e9b SK |
877 | |
878 | if ((x->props.flags & XFRM_STATE_ESN)) { | |
879 | if (snprintf(authenc_name, CRYPTO_MAX_ALG_NAME, | |
7021b2e1 HX |
880 | "%s%sauthencesn(%s,%s)%s", |
881 | x->geniv ?: "", x->geniv ? "(" : "", | |
0dc49e9b | 882 | x->aalg ? x->aalg->alg_name : "digest_null", |
7021b2e1 HX |
883 | x->ealg->alg_name, |
884 | x->geniv ? ")" : "") >= CRYPTO_MAX_ALG_NAME) | |
0dc49e9b SK |
885 | goto error; |
886 | } else { | |
887 | if (snprintf(authenc_name, CRYPTO_MAX_ALG_NAME, | |
7021b2e1 HX |
888 | "%s%sauthenc(%s,%s)%s", |
889 | x->geniv ?: "", x->geniv ? "(" : "", | |
0dc49e9b | 890 | x->aalg ? x->aalg->alg_name : "digest_null", |
7021b2e1 HX |
891 | x->ealg->alg_name, |
892 | x->geniv ? ")" : "") >= CRYPTO_MAX_ALG_NAME) | |
0dc49e9b SK |
893 | goto error; |
894 | } | |
38320c70 | 895 | |
f58869c4 | 896 | aead = crypto_alloc_aead(authenc_name, 0, 0); |
38320c70 HX |
897 | err = PTR_ERR(aead); |
898 | if (IS_ERR(aead)) | |
899 | goto error; | |
900 | ||
1c5ad13f | 901 | x->data = aead; |
38320c70 HX |
902 | |
903 | keylen = (x->aalg ? (x->aalg->alg_key_len + 7) / 8 : 0) + | |
904 | (x->ealg->alg_key_len + 7) / 8 + RTA_SPACE(sizeof(*param)); | |
905 | err = -ENOMEM; | |
906 | key = kmalloc(keylen, GFP_KERNEL); | |
907 | if (!key) | |
908 | goto error; | |
909 | ||
910 | p = key; | |
911 | rta = (void *)p; | |
912 | rta->rta_type = CRYPTO_AUTHENC_KEYA_PARAM; | |
913 | rta->rta_len = RTA_LENGTH(sizeof(*param)); | |
914 | param = RTA_DATA(rta); | |
915 | p += RTA_SPACE(sizeof(*param)); | |
916 | ||
1da177e4 LT |
917 | if (x->aalg) { |
918 | struct xfrm_algo_desc *aalg_desc; | |
919 | ||
38320c70 HX |
920 | memcpy(p, x->aalg->alg_key, (x->aalg->alg_key_len + 7) / 8); |
921 | p += (x->aalg->alg_key_len + 7) / 8; | |
1da177e4 LT |
922 | |
923 | aalg_desc = xfrm_aalg_get_byname(x->aalg->alg_name, 0); | |
924 | BUG_ON(!aalg_desc); | |
925 | ||
38320c70 | 926 | err = -EINVAL; |
45083497 | 927 | if (aalg_desc->uinfo.auth.icv_fullbits / 8 != |
38320c70 | 928 | crypto_aead_authsize(aead)) { |
45083497 JP |
929 | pr_info("ESP: %s digestsize %u != %hu\n", |
930 | x->aalg->alg_name, | |
931 | crypto_aead_authsize(aead), | |
932 | aalg_desc->uinfo.auth.icv_fullbits / 8); | |
38320c70 | 933 | goto free_key; |
1da177e4 LT |
934 | } |
935 | ||
38320c70 | 936 | err = crypto_aead_setauthsize( |
8f8a088c | 937 | aead, x->aalg->alg_trunc_len / 8); |
38320c70 HX |
938 | if (err) |
939 | goto free_key; | |
1da177e4 | 940 | } |
4b7137ff | 941 | |
38320c70 HX |
942 | param->enckeylen = cpu_to_be32((x->ealg->alg_key_len + 7) / 8); |
943 | memcpy(p, x->ealg->alg_key, (x->ealg->alg_key_len + 7) / 8); | |
944 | ||
945 | err = crypto_aead_setkey(aead, key, keylen); | |
946 | ||
947 | free_key: | |
948 | kfree(key); | |
949 | ||
1a6509d9 HX |
950 | error: |
951 | return err; | |
952 | } | |
953 | ||
954 | static int esp_init_state(struct xfrm_state *x) | |
955 | { | |
1a6509d9 HX |
956 | struct crypto_aead *aead; |
957 | u32 align; | |
958 | int err; | |
959 | ||
1c5ad13f | 960 | x->data = NULL; |
1a6509d9 HX |
961 | |
962 | if (x->aead) | |
963 | err = esp_init_aead(x); | |
964 | else | |
965 | err = esp_init_authenc(x); | |
966 | ||
38320c70 | 967 | if (err) |
1da177e4 | 968 | goto error; |
38320c70 | 969 | |
1c5ad13f | 970 | aead = x->data; |
1a6509d9 | 971 | |
38320c70 HX |
972 | x->props.header_len = sizeof(struct ip_esp_hdr) + |
973 | crypto_aead_ivsize(aead); | |
7e49e6de | 974 | if (x->props.mode == XFRM_MODE_TUNNEL) |
1da177e4 | 975 | x->props.header_len += sizeof(struct iphdr); |
eb49e630 | 976 | else if (x->props.mode == XFRM_MODE_BEET && x->sel.family != AF_INET6) |
ac758e3c | 977 | x->props.header_len += IPV4_BEET_PHMAXLEN; |
1da177e4 LT |
978 | if (x->encap) { |
979 | struct xfrm_encap_tmpl *encap = x->encap; | |
980 | ||
981 | switch (encap->encap_type) { | |
982 | default: | |
bcfd09f7 | 983 | err = -EINVAL; |
1da177e4 LT |
984 | goto error; |
985 | case UDP_ENCAP_ESPINUDP: | |
986 | x->props.header_len += sizeof(struct udphdr); | |
987 | break; | |
988 | case UDP_ENCAP_ESPINUDP_NON_IKE: | |
989 | x->props.header_len += sizeof(struct udphdr) + 2 * sizeof(u32); | |
990 | break; | |
991 | } | |
992 | } | |
38320c70 HX |
993 | |
994 | align = ALIGN(crypto_aead_blocksize(aead), 4); | |
1c5ad13f | 995 | x->props.trailer_len = align + 1 + crypto_aead_authsize(aead); |
1da177e4 LT |
996 | |
997 | error: | |
38320c70 | 998 | return err; |
1da177e4 LT |
999 | } |
1000 | ||
827789cb SK |
1001 | static int esp4_rcv_cb(struct sk_buff *skb, int err) |
1002 | { | |
1003 | return 0; | |
1004 | } | |
1005 | ||
533cb5b0 | 1006 | static const struct xfrm_type esp_type = |
1da177e4 LT |
1007 | { |
1008 | .description = "ESP4", | |
1009 | .owner = THIS_MODULE, | |
1010 | .proto = IPPROTO_ESP, | |
436a0a40 | 1011 | .flags = XFRM_TYPE_REPLAY_PROT, |
1da177e4 LT |
1012 | .init_state = esp_init_state, |
1013 | .destructor = esp_destroy, | |
1da177e4 | 1014 | .input = esp_input, |
fca11ebd | 1015 | .output = esp_output, |
1da177e4 LT |
1016 | }; |
1017 | ||
827789cb | 1018 | static struct xfrm4_protocol esp4_protocol = { |
1da177e4 | 1019 | .handler = xfrm4_rcv, |
827789cb SK |
1020 | .input_handler = xfrm_input, |
1021 | .cb_handler = esp4_rcv_cb, | |
1da177e4 | 1022 | .err_handler = esp4_err, |
827789cb | 1023 | .priority = 0, |
1da177e4 LT |
1024 | }; |
1025 | ||
1026 | static int __init esp4_init(void) | |
1027 | { | |
1da177e4 | 1028 | if (xfrm_register_type(&esp_type, AF_INET) < 0) { |
058bd4d2 | 1029 | pr_info("%s: can't add xfrm type\n", __func__); |
1da177e4 LT |
1030 | return -EAGAIN; |
1031 | } | |
827789cb | 1032 | if (xfrm4_protocol_register(&esp4_protocol, IPPROTO_ESP) < 0) { |
058bd4d2 | 1033 | pr_info("%s: can't add protocol\n", __func__); |
1da177e4 LT |
1034 | xfrm_unregister_type(&esp_type, AF_INET); |
1035 | return -EAGAIN; | |
1036 | } | |
1037 | return 0; | |
1038 | } | |
1039 | ||
1040 | static void __exit esp4_fini(void) | |
1041 | { | |
827789cb | 1042 | if (xfrm4_protocol_deregister(&esp4_protocol, IPPROTO_ESP) < 0) |
058bd4d2 | 1043 | pr_info("%s: can't remove protocol\n", __func__); |
4f518e80 | 1044 | xfrm_unregister_type(&esp_type, AF_INET); |
1da177e4 LT |
1045 | } |
1046 | ||
1047 | module_init(esp4_init); | |
1048 | module_exit(esp4_fini); | |
1049 | MODULE_LICENSE("GPL"); | |
d3d6dd3a | 1050 | MODULE_ALIAS_XFRM_TYPE(AF_INET, XFRM_PROTO_ESP); |