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Thomas Gleixner1ccea772019-05-19 15:51:43 +02001// SPDX-License-Identifier: GPL-2.0-or-later
Linus Torvalds1da177e2005-04-16 15:20:36 -07002/*
3 * Copyright (C)2002 USAGI/WIDE Project
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09004 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07005 * Authors
6 *
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09007 * Mitsuru KANDA @USAGI : IPv6 Support
Ian Morris67ba4152014-08-24 21:53:10 +01008 * Kazunori MIYAZAWA @USAGI :
9 * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +090010 *
Ian Morris67ba4152014-08-24 21:53:10 +010011 * This file is derived from net/ipv4/esp.c
Linus Torvalds1da177e2005-04-16 15:20:36 -070012 */
13
Joe Perchesf3213832012-05-15 14:11:53 +000014#define pr_fmt(fmt) "IPv6: " fmt
15
Herbert Xu38320c72008-01-28 19:35:05 -080016#include <crypto/aead.h>
17#include <crypto/authenc.h>
Herbert Xu6b7326c2006-07-30 15:41:01 +100018#include <linux/err.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070019#include <linux/module.h>
20#include <net/ip.h>
21#include <net/xfrm.h>
22#include <net/esp.h>
Adrian Bunk72998d82007-10-26 22:53:58 -070023#include <linux/scatterlist.h>
Herbert Xua02a6422005-10-10 21:11:08 -070024#include <linux/kernel.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070025#include <linux/pfkeyv2.h>
26#include <linux/random.h>
Herbert Xu38320c72008-01-28 19:35:05 -080027#include <linux/slab.h>
Herbert Xub7c6538c2007-10-09 13:33:35 -070028#include <linux/spinlock.h>
David S. Miller81aded22012-06-15 14:54:11 -070029#include <net/ip6_route.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070030#include <net/icmp.h>
31#include <net/ipv6.h>
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020032#include <net/protocol.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070033#include <linux/icmpv6.h>
34
Steffen Klassert03e2a302017-01-17 10:23:03 +010035#include <linux/highmem.h>
36
Herbert Xu38320c72008-01-28 19:35:05 -080037struct esp_skb_cb {
38 struct xfrm_skb_cb xfrm;
39 void *tmp;
40};
41
42#define ESP_SKB_CB(__skb) ((struct esp_skb_cb *)&((__skb)->cb[0]))
43
44/*
45 * Allocate an AEAD request structure with extra space for SG and IV.
46 *
Steffen Klassertd212a4c2011-03-08 00:07:51 +000047 * For alignment considerations the upper 32 bits of the sequence number are
48 * placed at the front, if present. Followed by the IV, the request and finally
49 * the SG list.
Herbert Xu38320c72008-01-28 19:35:05 -080050 *
51 * TODO: Use spare space in skb for this where possible.
52 */
Steffen Klassertd212a4c2011-03-08 00:07:51 +000053static void *esp_alloc_tmp(struct crypto_aead *aead, int nfrags, int seqihlen)
Herbert Xu38320c72008-01-28 19:35:05 -080054{
55 unsigned int len;
56
Steffen Klassertd212a4c2011-03-08 00:07:51 +000057 len = seqihlen;
58
59 len += crypto_aead_ivsize(aead);
60
Herbert Xu38320c72008-01-28 19:35:05 -080061 if (len) {
62 len += crypto_aead_alignmask(aead) &
63 ~(crypto_tfm_ctx_alignment() - 1);
64 len = ALIGN(len, crypto_tfm_ctx_alignment());
65 }
66
Herbert Xu000ae7b2015-05-27 16:03:47 +080067 len += sizeof(struct aead_request) + crypto_aead_reqsize(aead);
Herbert Xu38320c72008-01-28 19:35:05 -080068 len = ALIGN(len, __alignof__(struct scatterlist));
69
70 len += sizeof(struct scatterlist) * nfrags;
71
72 return kmalloc(len, GFP_ATOMIC);
73}
74
Steffen Klassertd212a4c2011-03-08 00:07:51 +000075static inline __be32 *esp_tmp_seqhi(void *tmp)
76{
77 return PTR_ALIGN((__be32 *)tmp, __alignof__(__be32));
78}
79
80static inline u8 *esp_tmp_iv(struct crypto_aead *aead, void *tmp, int seqhilen)
Herbert Xu38320c72008-01-28 19:35:05 -080081{
82 return crypto_aead_ivsize(aead) ?
Steffen Klassertd212a4c2011-03-08 00:07:51 +000083 PTR_ALIGN((u8 *)tmp + seqhilen,
84 crypto_aead_alignmask(aead) + 1) : tmp + seqhilen;
Herbert Xu38320c72008-01-28 19:35:05 -080085}
86
Herbert Xu38320c72008-01-28 19:35:05 -080087static inline struct aead_request *esp_tmp_req(struct crypto_aead *aead, u8 *iv)
88{
89 struct aead_request *req;
90
91 req = (void *)PTR_ALIGN(iv + crypto_aead_ivsize(aead),
92 crypto_tfm_ctx_alignment());
93 aead_request_set_tfm(req, aead);
94 return req;
95}
96
97static inline struct scatterlist *esp_req_sg(struct crypto_aead *aead,
98 struct aead_request *req)
99{
100 return (void *)ALIGN((unsigned long)(req + 1) +
101 crypto_aead_reqsize(aead),
102 __alignof__(struct scatterlist));
103}
104
Steffen Klassert03e2a302017-01-17 10:23:03 +0100105static void esp_ssg_unref(struct xfrm_state *x, void *tmp)
106{
Steffen Klassert03e2a302017-01-17 10:23:03 +0100107 struct crypto_aead *aead = x->data;
108 int seqhilen = 0;
109 u8 *iv;
110 struct aead_request *req;
111 struct scatterlist *sg;
112
113 if (x->props.flags & XFRM_STATE_ESN)
114 seqhilen += sizeof(__be32);
115
Steffen Klassert03e2a302017-01-17 10:23:03 +0100116 iv = esp_tmp_iv(aead, tmp, seqhilen);
117 req = esp_tmp_req(aead, iv);
118
119 /* Unref skb_frag_pages in the src scatterlist if necessary.
120 * Skip the first sg which comes from skb->data.
121 */
122 if (req->src != req->dst)
123 for (sg = sg_next(req->src); sg; sg = sg_next(sg))
124 put_page(sg_page(sg));
125}
126
Herbert Xu38320c72008-01-28 19:35:05 -0800127static void esp_output_done(struct crypto_async_request *base, int err)
128{
129 struct sk_buff *skb = base->data;
Steffen Klassertf53c7232017-12-20 10:41:36 +0100130 struct xfrm_offload *xo = xfrm_offload(skb);
Steffen Klassert03e2a302017-01-17 10:23:03 +0100131 void *tmp;
Steffen Klassertf53c7232017-12-20 10:41:36 +0100132 struct xfrm_state *x;
133
Florian Westphal2294be0f2018-12-18 17:15:20 +0100134 if (xo && (xo->flags & XFRM_DEV_RESUME)) {
135 struct sec_path *sp = skb_sec_path(skb);
136
137 x = sp->xvec[sp->len - 1];
138 } else {
Steffen Klassertf53c7232017-12-20 10:41:36 +0100139 x = skb_dst(skb)->xfrm;
Florian Westphal2294be0f2018-12-18 17:15:20 +0100140 }
Herbert Xu38320c72008-01-28 19:35:05 -0800141
Steffen Klassert03e2a302017-01-17 10:23:03 +0100142 tmp = ESP_SKB_CB(skb)->tmp;
143 esp_ssg_unref(x, tmp);
144 kfree(tmp);
Steffen Klassertf53c7232017-12-20 10:41:36 +0100145
146 if (xo && (xo->flags & XFRM_DEV_RESUME)) {
147 if (err) {
148 XFRM_INC_STATS(xs_net(x), LINUX_MIB_XFRMOUTSTATEPROTOERROR);
149 kfree_skb(skb);
150 return;
151 }
152
153 skb_push(skb, skb->data - skb_mac_header(skb));
154 secpath_reset(skb);
155 xfrm_dev_resume(skb);
156 } else {
157 xfrm_output_resume(skb, err);
158 }
Herbert Xu38320c72008-01-28 19:35:05 -0800159}
160
Herbert Xu000ae7b2015-05-27 16:03:47 +0800161/* Move ESP header back into place. */
162static void esp_restore_header(struct sk_buff *skb, unsigned int offset)
163{
164 struct ip_esp_hdr *esph = (void *)(skb->data + offset);
165 void *tmp = ESP_SKB_CB(skb)->tmp;
166 __be32 *seqhi = esp_tmp_seqhi(tmp);
167
168 esph->seq_no = esph->spi;
169 esph->spi = *seqhi;
170}
171
172static void esp_output_restore_header(struct sk_buff *skb)
173{
174 esp_restore_header(skb, skb_transport_offset(skb) - sizeof(__be32));
175}
176
Steffen Klassert03e2a302017-01-17 10:23:03 +0100177static struct ip_esp_hdr *esp_output_set_esn(struct sk_buff *skb,
Steffen Klassert383d0352017-04-14 10:06:42 +0200178 struct xfrm_state *x,
Steffen Klassert03e2a302017-01-17 10:23:03 +0100179 struct ip_esp_hdr *esph,
180 __be32 *seqhi)
181{
Steffen Klassert03e2a302017-01-17 10:23:03 +0100182 /* For ESN we move the header forward by 4 bytes to
183 * accomodate the high bits. We will move it back after
184 * encryption.
185 */
186 if ((x->props.flags & XFRM_STATE_ESN)) {
Steffen Klassert7862b402017-04-14 10:06:50 +0200187 struct xfrm_offload *xo = xfrm_offload(skb);
188
Steffen Klassert03e2a302017-01-17 10:23:03 +0100189 esph = (void *)(skb_transport_header(skb) - sizeof(__be32));
190 *seqhi = esph->spi;
Steffen Klassert7862b402017-04-14 10:06:50 +0200191 if (xo)
192 esph->seq_no = htonl(xo->seq.hi);
193 else
194 esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.hi);
Steffen Klassert03e2a302017-01-17 10:23:03 +0100195 }
196
197 esph->spi = x->id.spi;
198
199 return esph;
200}
201
Herbert Xu000ae7b2015-05-27 16:03:47 +0800202static void esp_output_done_esn(struct crypto_async_request *base, int err)
203{
204 struct sk_buff *skb = base->data;
205
206 esp_output_restore_header(skb);
207 esp_output_done(base, err);
208}
209
Steffen Klasserteb758c82017-01-17 10:23:08 +0100210static void esp_output_fill_trailer(u8 *tail, int tfclen, int plen, __u8 proto)
211{
212 /* Fill padding... */
213 if (tfclen) {
214 memset(tail, 0, tfclen);
215 tail += tfclen;
216 }
217 do {
218 int i;
219 for (i = 0; i < plen - 2; i++)
220 tail[i] = i + 1;
221 } while (0);
222 tail[plen - 2] = plen - 2;
223 tail[plen - 1] = proto;
224}
225
Steffen Klassert383d0352017-04-14 10:06:42 +0200226int esp6_output_head(struct xfrm_state *x, struct sk_buff *skb, struct esp_info *esp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227{
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -0700228 u8 *tail;
Steffen Klassert03e2a302017-01-17 10:23:03 +0100229 u8 *vaddr;
Steffen Klassert383d0352017-04-14 10:06:42 +0200230 int nfrags;
231 struct page *page;
Steffen Klassert383d0352017-04-14 10:06:42 +0200232 struct sk_buff *trailer;
233 int tailen = esp->tailen;
Steffen Klassertd212a4c2011-03-08 00:07:51 +0000234
Steffen Klassert03e2a302017-01-17 10:23:03 +0100235 if (!skb_cloned(skb)) {
Steffen Klassert54ffd792017-08-25 07:34:35 +0200236 if (tailen <= skb_tailroom(skb)) {
Steffen Klassert03e2a302017-01-17 10:23:03 +0100237 nfrags = 1;
238 trailer = skb;
239 tail = skb_tail_pointer(trailer);
240
241 goto skip_cow;
242 } else if ((skb_shinfo(skb)->nr_frags < MAX_SKB_FRAGS)
243 && !skb_has_frag_list(skb)) {
244 int allocsize;
245 struct sock *sk = skb->sk;
246 struct page_frag *pfrag = &x->xfrag;
247
Steffen Klassert383d0352017-04-14 10:06:42 +0200248 esp->inplace = false;
249
Steffen Klassert03e2a302017-01-17 10:23:03 +0100250 allocsize = ALIGN(tailen, L1_CACHE_BYTES);
251
252 spin_lock_bh(&x->lock);
253
254 if (unlikely(!skb_page_frag_refill(allocsize, pfrag, GFP_ATOMIC))) {
255 spin_unlock_bh(&x->lock);
256 goto cow;
257 }
258
259 page = pfrag->page;
260 get_page(page);
261
262 vaddr = kmap_atomic(page);
263
264 tail = vaddr + pfrag->offset;
265
Steffen Klassert383d0352017-04-14 10:06:42 +0200266 esp_output_fill_trailer(tail, esp->tfclen, esp->plen, esp->proto);
Steffen Klassert03e2a302017-01-17 10:23:03 +0100267
268 kunmap_atomic(vaddr);
269
270 nfrags = skb_shinfo(skb)->nr_frags;
271
272 __skb_fill_page_desc(skb, nfrags, page, pfrag->offset,
273 tailen);
274 skb_shinfo(skb)->nr_frags = ++nfrags;
275
276 pfrag->offset = pfrag->offset + allocsize;
Steffen Klassert36ff0dd2017-08-25 07:16:07 +0200277
278 spin_unlock_bh(&x->lock);
279
Steffen Klassert03e2a302017-01-17 10:23:03 +0100280 nfrags++;
281
282 skb->len += tailen;
283 skb->data_len += tailen;
284 skb->truesize += tailen;
Martin Willi09db5122019-01-28 09:35:35 +0100285 if (sk && sk_fullsock(sk))
Reshetova, Elena14afee42017-06-30 13:08:00 +0300286 refcount_add(tailen, &sk->sk_wmem_alloc);
Steffen Klassert03e2a302017-01-17 10:23:03 +0100287
Steffen Klassert383d0352017-04-14 10:06:42 +0200288 goto out;
Steffen Klassert03e2a302017-01-17 10:23:03 +0100289 }
290 }
291
292cow:
Steffen Klassert383d0352017-04-14 10:06:42 +0200293 nfrags = skb_cow_data(skb, tailen, &trailer);
294 if (nfrags < 0)
295 goto out;
Steffen Klassert03e2a302017-01-17 10:23:03 +0100296 tail = skb_tail_pointer(trailer);
Steffen Klassert03e2a302017-01-17 10:23:03 +0100297
298skip_cow:
Steffen Klassert383d0352017-04-14 10:06:42 +0200299 esp_output_fill_trailer(tail, esp->tfclen, esp->plen, esp->proto);
300 pskb_put(skb, trailer, tailen);
Steffen Klassert03e2a302017-01-17 10:23:03 +0100301
Steffen Klassert383d0352017-04-14 10:06:42 +0200302out:
303 return nfrags;
304}
305EXPORT_SYMBOL_GPL(esp6_output_head);
Steffen Klassert03e2a302017-01-17 10:23:03 +0100306
Steffen Klassert383d0352017-04-14 10:06:42 +0200307int esp6_output_tail(struct xfrm_state *x, struct sk_buff *skb, struct esp_info *esp)
308{
309 u8 *iv;
310 int alen;
311 void *tmp;
312 int ivlen;
313 int assoclen;
314 int seqhilen;
315 __be32 *seqhi;
316 struct page *page;
317 struct ip_esp_hdr *esph;
318 struct aead_request *req;
319 struct crypto_aead *aead;
320 struct scatterlist *sg, *dsg;
321 int err = -ENOMEM;
Steffen Klassert03e2a302017-01-17 10:23:03 +0100322
Steffen Klassert383d0352017-04-14 10:06:42 +0200323 assoclen = sizeof(struct ip_esp_hdr);
324 seqhilen = 0;
325
326 if (x->props.flags & XFRM_STATE_ESN) {
327 seqhilen += sizeof(__be32);
328 assoclen += sizeof(__be32);
329 }
330
331 aead = x->data;
332 alen = crypto_aead_authsize(aead);
333 ivlen = crypto_aead_ivsize(aead);
334
335 tmp = esp_alloc_tmp(aead, esp->nfrags + 2, seqhilen);
Steffen Klasserte892d2d2017-04-24 07:33:56 +0200336 if (!tmp)
Herbert Xu38320c72008-01-28 19:35:05 -0800337 goto error;
338
Steffen Klassertd212a4c2011-03-08 00:07:51 +0000339 seqhi = esp_tmp_seqhi(tmp);
340 iv = esp_tmp_iv(aead, tmp, seqhilen);
Herbert Xu000ae7b2015-05-27 16:03:47 +0800341 req = esp_tmp_req(aead, iv);
342 sg = esp_req_sg(aead, req);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343
Steffen Klassert383d0352017-04-14 10:06:42 +0200344 if (esp->inplace)
345 dsg = sg;
346 else
347 dsg = &sg[esp->nfrags];
Herbert Xu000ae7b2015-05-27 16:03:47 +0800348
Steffen Klassert383d0352017-04-14 10:06:42 +0200349 esph = esp_output_set_esn(skb, x, ip_esp_hdr(skb), seqhi);
350
351 sg_init_table(sg, esp->nfrags);
Jason A. Donenfeld3f297702017-06-04 04:16:23 +0200352 err = skb_to_sgvec(skb, sg,
353 (unsigned char *)esph - skb->data,
354 assoclen + ivlen + esp->clen + alen);
355 if (unlikely(err < 0))
Steffen Klasserte6194922017-07-13 09:13:30 +0200356 goto error_free;
Steffen Klassertd212a4c2011-03-08 00:07:51 +0000357
Steffen Klassert383d0352017-04-14 10:06:42 +0200358 if (!esp->inplace) {
359 int allocsize;
360 struct page_frag *pfrag = &x->xfrag;
361
362 allocsize = ALIGN(skb->data_len, L1_CACHE_BYTES);
363
364 spin_lock_bh(&x->lock);
365 if (unlikely(!skb_page_frag_refill(allocsize, pfrag, GFP_ATOMIC))) {
366 spin_unlock_bh(&x->lock);
Steffen Klasserte6194922017-07-13 09:13:30 +0200367 goto error_free;
Steffen Klassert383d0352017-04-14 10:06:42 +0200368 }
369
370 skb_shinfo(skb)->nr_frags = 1;
371
372 page = pfrag->page;
373 get_page(page);
374 /* replace page frags in skb with new page */
375 __skb_fill_page_desc(skb, 0, page, pfrag->offset, skb->data_len);
376 pfrag->offset = pfrag->offset + allocsize;
377 spin_unlock_bh(&x->lock);
378
379 sg_init_table(dsg, skb_shinfo(skb)->nr_frags + 1);
Jason A. Donenfeld3f297702017-06-04 04:16:23 +0200380 err = skb_to_sgvec(skb, dsg,
381 (unsigned char *)esph - skb->data,
382 assoclen + ivlen + esp->clen + alen);
383 if (unlikely(err < 0))
Steffen Klasserte6194922017-07-13 09:13:30 +0200384 goto error_free;
Steffen Klassert383d0352017-04-14 10:06:42 +0200385 }
386
Steffen Klassert03e2a302017-01-17 10:23:03 +0100387 if ((x->props.flags & XFRM_STATE_ESN))
388 aead_request_set_callback(req, 0, esp_output_done_esn, skb);
389 else
390 aead_request_set_callback(req, 0, esp_output_done, skb);
391
Steffen Klassert383d0352017-04-14 10:06:42 +0200392 aead_request_set_crypt(req, sg, dsg, ivlen + esp->clen, iv);
Herbert Xu000ae7b2015-05-27 16:03:47 +0800393 aead_request_set_ad(req, assoclen);
Herbert Xub7c6538c2007-10-09 13:33:35 -0700394
Herbert Xu000ae7b2015-05-27 16:03:47 +0800395 memset(iv, 0, ivlen);
Steffen Klassert383d0352017-04-14 10:06:42 +0200396 memcpy(iv + ivlen - min(ivlen, 8), (u8 *)&esp->seqno + 8 - min(ivlen, 8),
Herbert Xu000ae7b2015-05-27 16:03:47 +0800397 min(ivlen, 8));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398
Herbert Xu38320c72008-01-28 19:35:05 -0800399 ESP_SKB_CB(skb)->tmp = tmp;
Herbert Xu000ae7b2015-05-27 16:03:47 +0800400 err = crypto_aead_encrypt(req);
401
402 switch (err) {
403 case -EINPROGRESS:
Herbert Xu38320c72008-01-28 19:35:05 -0800404 goto error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405
Gilad Ben-Yossef068c2e72017-10-18 08:00:35 +0100406 case -ENOSPC:
Herbert Xu38320c72008-01-28 19:35:05 -0800407 err = NET_XMIT_DROP;
Herbert Xu000ae7b2015-05-27 16:03:47 +0800408 break;
409
410 case 0:
411 if ((x->props.flags & XFRM_STATE_ESN))
412 esp_output_restore_header(skb);
413 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414
Steffen Klassert03e2a302017-01-17 10:23:03 +0100415 if (sg != dsg)
416 esp_ssg_unref(x, tmp);
Herbert Xub7c6538c2007-10-09 13:33:35 -0700417
Steffen Klasserte6194922017-07-13 09:13:30 +0200418error_free:
419 kfree(tmp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420error:
421 return err;
422}
Steffen Klassert383d0352017-04-14 10:06:42 +0200423EXPORT_SYMBOL_GPL(esp6_output_tail);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424
Steffen Klassert383d0352017-04-14 10:06:42 +0200425static int esp6_output(struct xfrm_state *x, struct sk_buff *skb)
426{
427 int alen;
428 int blksize;
429 struct ip_esp_hdr *esph;
430 struct crypto_aead *aead;
431 struct esp_info esp;
432
433 esp.inplace = true;
434
435 esp.proto = *skb_mac_header(skb);
436 *skb_mac_header(skb) = IPPROTO_ESP;
437
438 /* skb is pure payload to encrypt */
439
440 aead = x->data;
441 alen = crypto_aead_authsize(aead);
442
443 esp.tfclen = 0;
444 if (x->tfcpad) {
445 struct xfrm_dst *dst = (struct xfrm_dst *)skb_dst(skb);
446 u32 padto;
447
Florian Westphalc7b37c72019-06-24 22:04:48 +0200448 padto = min(x->tfcpad, xfrm_state_mtu(x, dst->child_mtu_cached));
Steffen Klassert383d0352017-04-14 10:06:42 +0200449 if (skb->len < padto)
450 esp.tfclen = padto - skb->len;
451 }
452 blksize = ALIGN(crypto_aead_blocksize(aead), 4);
453 esp.clen = ALIGN(skb->len + 2 + esp.tfclen, blksize);
454 esp.plen = esp.clen - skb->len - esp.tfclen;
455 esp.tailen = esp.tfclen + esp.plen + alen;
456
457 esp.nfrags = esp6_output_head(x, skb, &esp);
458 if (esp.nfrags < 0)
459 return esp.nfrags;
460
461 esph = ip_esp_hdr(skb);
462 esph->spi = x->id.spi;
463
464 esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.low);
465 esp.seqno = cpu_to_be64(XFRM_SKB_CB(skb)->seq.output.low +
466 ((u64)XFRM_SKB_CB(skb)->seq.output.hi << 32));
467
468 skb_push(skb, -skb_network_offset(skb));
469
470 return esp6_output_tail(x, skb, &esp);
471}
472
Yossi Kuperman47ebcc02017-08-30 11:30:39 +0300473static inline int esp_remove_trailer(struct sk_buff *skb)
Herbert Xu38320c72008-01-28 19:35:05 -0800474{
475 struct xfrm_state *x = xfrm_input_state(skb);
Steffen Klassertd77e38e2017-04-14 10:06:10 +0200476 struct xfrm_offload *xo = xfrm_offload(skb);
Mathias Krause1c5ad132013-10-18 12:09:05 +0200477 struct crypto_aead *aead = x->data;
Yossi Kuperman47ebcc02017-08-30 11:30:39 +0300478 int alen, hlen, elen;
Ilan Tayarie51a6472017-08-01 12:49:05 +0300479 int padlen, trimlen;
480 __wsum csumdiff;
Herbert Xu38320c72008-01-28 19:35:05 -0800481 u8 nexthdr[2];
Yossi Kuperman47ebcc02017-08-30 11:30:39 +0300482 int ret;
Herbert Xu38320c72008-01-28 19:35:05 -0800483
Yossi Kuperman47ebcc02017-08-30 11:30:39 +0300484 alen = crypto_aead_authsize(aead);
485 hlen = sizeof(struct ip_esp_hdr) + crypto_aead_ivsize(aead);
486 elen = skb->len - hlen;
Herbert Xu38320c72008-01-28 19:35:05 -0800487
Yossi Kuperman47ebcc02017-08-30 11:30:39 +0300488 if (xo && (xo->flags & XFRM_ESP_NO_TRAILER)) {
489 ret = xo->proto;
Herbert Xu38320c72008-01-28 19:35:05 -0800490 goto out;
Yossi Kuperman47ebcc02017-08-30 11:30:39 +0300491 }
Herbert Xu38320c72008-01-28 19:35:05 -0800492
Gustavo A. R. Silvaeee12df2017-10-26 07:51:06 -0500493 ret = skb_copy_bits(skb, skb->len - alen - 2, nexthdr, 2);
494 BUG_ON(ret);
Herbert Xu38320c72008-01-28 19:35:05 -0800495
Yossi Kuperman47ebcc02017-08-30 11:30:39 +0300496 ret = -EINVAL;
Herbert Xu38320c72008-01-28 19:35:05 -0800497 padlen = nexthdr[0];
498 if (padlen + 2 + alen >= elen) {
Joe Perchesba7a46f2014-11-11 10:59:17 -0800499 net_dbg_ratelimited("ipsec esp packet is garbage padlen=%d, elen=%d\n",
500 padlen + 2, elen - alen);
Herbert Xu38320c72008-01-28 19:35:05 -0800501 goto out;
502 }
503
Ilan Tayarie51a6472017-08-01 12:49:05 +0300504 trimlen = alen + padlen + 2;
505 if (skb->ip_summed == CHECKSUM_COMPLETE) {
506 csumdiff = skb_checksum(skb, skb->len - trimlen, trimlen, 0);
507 skb->csum = csum_block_sub(skb->csum, csumdiff,
508 skb->len - trimlen);
509 }
510 pskb_trim(skb, skb->len - trimlen);
511
Yossi Kuperman47ebcc02017-08-30 11:30:39 +0300512 ret = nexthdr[1];
513
514out:
515 return ret;
516}
517
518int esp6_input_done2(struct sk_buff *skb, int err)
519{
520 struct xfrm_state *x = xfrm_input_state(skb);
521 struct xfrm_offload *xo = xfrm_offload(skb);
522 struct crypto_aead *aead = x->data;
523 int hlen = sizeof(struct ip_esp_hdr) + crypto_aead_ivsize(aead);
524 int hdr_len = skb_network_header_len(skb);
525
526 if (!xo || (xo && !(xo->flags & CRYPTO_DONE)))
527 kfree(ESP_SKB_CB(skb)->tmp);
528
529 if (unlikely(err))
530 goto out;
531
532 err = esp_remove_trailer(skb);
533 if (unlikely(err < 0))
534 goto out;
535
536 skb_postpull_rcsum(skb, skb_network_header(skb),
537 skb_network_header_len(skb));
Ilan Tayarie51a6472017-08-01 12:49:05 +0300538 skb_pull_rcsum(skb, hlen);
Li RongQinga9403f82013-01-08 15:41:12 +0800539 if (x->props.mode == XFRM_MODE_TUNNEL)
540 skb_reset_transport_header(skb);
541 else
542 skb_set_transport_header(skb, -hdr_len);
Herbert Xu38320c72008-01-28 19:35:05 -0800543
Herbert Xu38320c72008-01-28 19:35:05 -0800544 /* RFC4303: Drop dummy packets without any error */
545 if (err == IPPROTO_NONE)
546 err = -EINVAL;
547
548out:
549 return err;
550}
Steffen Klassert383d0352017-04-14 10:06:42 +0200551EXPORT_SYMBOL_GPL(esp6_input_done2);
Herbert Xu38320c72008-01-28 19:35:05 -0800552
553static void esp_input_done(struct crypto_async_request *base, int err)
554{
555 struct sk_buff *skb = base->data;
556
Steffen Klassertf1fbed02017-04-14 10:06:21 +0200557 xfrm_input_resume(skb, esp6_input_done2(skb, err));
Herbert Xu38320c72008-01-28 19:35:05 -0800558}
559
Herbert Xu000ae7b2015-05-27 16:03:47 +0800560static void esp_input_restore_header(struct sk_buff *skb)
561{
562 esp_restore_header(skb, 0);
563 __skb_pull(skb, 4);
564}
565
Steffen Klassert03e2a302017-01-17 10:23:03 +0100566static void esp_input_set_header(struct sk_buff *skb, __be32 *seqhi)
567{
568 struct xfrm_state *x = xfrm_input_state(skb);
Steffen Klassert03e2a302017-01-17 10:23:03 +0100569
570 /* For ESN we move the header forward by 4 bytes to
571 * accomodate the high bits. We will move it back after
572 * decryption.
573 */
574 if ((x->props.flags & XFRM_STATE_ESN)) {
Colin Ian Kingd3cc5472017-10-19 15:09:47 +0200575 struct ip_esp_hdr *esph = skb_push(skb, 4);
576
Steffen Klassert03e2a302017-01-17 10:23:03 +0100577 *seqhi = esph->spi;
578 esph->spi = esph->seq_no;
579 esph->seq_no = XFRM_SKB_CB(skb)->seq.input.hi;
580 }
581}
582
Herbert Xu000ae7b2015-05-27 16:03:47 +0800583static void esp_input_done_esn(struct crypto_async_request *base, int err)
584{
585 struct sk_buff *skb = base->data;
586
587 esp_input_restore_header(skb);
588 esp_input_done(base, err);
589}
590
Herbert Xue6956332006-04-01 00:52:46 -0800591static int esp6_input(struct xfrm_state *x, struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700592{
Mathias Krause1c5ad132013-10-18 12:09:05 +0200593 struct crypto_aead *aead = x->data;
Herbert Xu38320c72008-01-28 19:35:05 -0800594 struct aead_request *req;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700595 struct sk_buff *trailer;
Herbert Xu000ae7b2015-05-27 16:03:47 +0800596 int ivlen = crypto_aead_ivsize(aead);
Haishuang Yan0c05f982018-08-17 15:51:00 +0800597 int elen = skb->len - sizeof(struct ip_esp_hdr) - ivlen;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700598 int nfrags;
Steffen Klassertd212a4c2011-03-08 00:07:51 +0000599 int assoclen;
Steffen Klassertd212a4c2011-03-08 00:07:51 +0000600 int seqhilen;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700601 int ret = 0;
Herbert Xu38320c72008-01-28 19:35:05 -0800602 void *tmp;
Steffen Klassertd212a4c2011-03-08 00:07:51 +0000603 __be32 *seqhi;
Herbert Xu38320c72008-01-28 19:35:05 -0800604 u8 *iv;
605 struct scatterlist *sg;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700606
Haishuang Yan0c05f982018-08-17 15:51:00 +0800607 if (!pskb_may_pull(skb, sizeof(struct ip_esp_hdr) + ivlen)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700608 ret = -EINVAL;
Herbert Xu31a4ab92006-05-27 23:06:13 -0700609 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610 }
611
Herbert Xu38320c72008-01-28 19:35:05 -0800612 if (elen <= 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700613 ret = -EINVAL;
Herbert Xu31a4ab92006-05-27 23:06:13 -0700614 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700615 }
616
Haishuang Yan0c05f982018-08-17 15:51:00 +0800617 assoclen = sizeof(struct ip_esp_hdr);
Steffen Klassertd212a4c2011-03-08 00:07:51 +0000618 seqhilen = 0;
619
620 if (x->props.flags & XFRM_STATE_ESN) {
Steffen Klassertd212a4c2011-03-08 00:07:51 +0000621 seqhilen += sizeof(__be32);
622 assoclen += seqhilen;
623 }
624
Steffen Klassert03e2a302017-01-17 10:23:03 +0100625 if (!skb_cloned(skb)) {
626 if (!skb_is_nonlinear(skb)) {
627 nfrags = 1;
628
629 goto skip_cow;
630 } else if (!skb_has_frag_list(skb)) {
631 nfrags = skb_shinfo(skb)->nr_frags;
632 nfrags++;
633
634 goto skip_cow;
635 }
636 }
637
638 nfrags = skb_cow_data(skb, 0, &trailer);
639 if (nfrags < 0) {
640 ret = -EINVAL;
641 goto out;
642 }
643
644skip_cow:
645 ret = -ENOMEM;
Herbert Xu000ae7b2015-05-27 16:03:47 +0800646 tmp = esp_alloc_tmp(aead, nfrags, seqhilen);
Herbert Xu38320c72008-01-28 19:35:05 -0800647 if (!tmp)
Herbert Xu0ebea8e2007-11-13 21:45:58 -0800648 goto out;
649
Herbert Xu38320c72008-01-28 19:35:05 -0800650 ESP_SKB_CB(skb)->tmp = tmp;
Steffen Klassertd212a4c2011-03-08 00:07:51 +0000651 seqhi = esp_tmp_seqhi(tmp);
652 iv = esp_tmp_iv(aead, tmp, seqhilen);
Herbert Xu38320c72008-01-28 19:35:05 -0800653 req = esp_tmp_req(aead, iv);
Herbert Xu000ae7b2015-05-27 16:03:47 +0800654 sg = esp_req_sg(aead, req);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700655
Steffen Klassert03e2a302017-01-17 10:23:03 +0100656 esp_input_set_header(skb, seqhi);
Thomas Graf95a02cf2007-12-10 16:53:29 -0800657
Herbert Xu38320c72008-01-28 19:35:05 -0800658 sg_init_table(sg, nfrags);
Jason A. Donenfeld3f297702017-06-04 04:16:23 +0200659 ret = skb_to_sgvec(skb, sg, 0, skb->len);
Zhen Lei7284fdf2018-06-27 11:49:28 +0800660 if (unlikely(ret < 0)) {
661 kfree(tmp);
Jason A. Donenfeld3f297702017-06-04 04:16:23 +0200662 goto out;
Zhen Lei7284fdf2018-06-27 11:49:28 +0800663 }
Steffen Klassertd212a4c2011-03-08 00:07:51 +0000664
Steffen Klassert03e2a302017-01-17 10:23:03 +0100665 skb->ip_summed = CHECKSUM_NONE;
666
667 if ((x->props.flags & XFRM_STATE_ESN))
668 aead_request_set_callback(req, 0, esp_input_done_esn, skb);
669 else
670 aead_request_set_callback(req, 0, esp_input_done, skb);
671
Herbert Xu000ae7b2015-05-27 16:03:47 +0800672 aead_request_set_crypt(req, sg, sg, elen + ivlen, iv);
673 aead_request_set_ad(req, assoclen);
Herbert Xu38320c72008-01-28 19:35:05 -0800674
675 ret = crypto_aead_decrypt(req);
676 if (ret == -EINPROGRESS)
677 goto out;
678
Herbert Xu000ae7b2015-05-27 16:03:47 +0800679 if ((x->props.flags & XFRM_STATE_ESN))
680 esp_input_restore_header(skb);
681
Steffen Klassertf1fbed02017-04-14 10:06:21 +0200682 ret = esp6_input_done2(skb, ret);
Herbert Xu38320c72008-01-28 19:35:05 -0800683
Linus Torvalds1da177e2005-04-16 15:20:36 -0700684out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700685 return ret;
686}
687
Steffen Klassertd5860c52014-03-14 07:28:07 +0100688static int esp6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
689 u8 type, u8 code, int offset, __be32 info)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700690{
Alexey Dobriyan4fb236b2008-11-25 17:59:27 -0800691 struct net *net = dev_net(skb->dev);
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000692 const struct ipv6hdr *iph = (const struct ipv6hdr *)skb->data;
Herbert Xu87bdc482007-10-10 15:45:25 -0700693 struct ip_esp_hdr *esph = (struct ip_esp_hdr *)(skb->data + offset);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700694 struct xfrm_state *x;
695
Steffen Klassertb3b2b9e2013-09-10 13:43:09 +0200696 if (type != ICMPV6_PKT_TOOBIG &&
David S. Millerec18d9a2012-07-12 00:25:15 -0700697 type != NDISC_REDIRECT)
Steffen Klassertd5860c52014-03-14 07:28:07 +0100698 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700699
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000700 x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr,
701 esph->spi, IPPROTO_ESP, AF_INET6);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700702 if (!x)
Steffen Klassertd5860c52014-03-14 07:28:07 +0100703 return 0;
David S. Millerec18d9a2012-07-12 00:25:15 -0700704
705 if (type == NDISC_REDIRECT)
Lorenzo Colittie2d118a2016-11-04 02:23:43 +0900706 ip6_redirect(skb, net, skb->dev->ifindex, 0,
707 sock_net_uid(net, NULL));
David S. Millerec18d9a2012-07-12 00:25:15 -0700708 else
Lorenzo Colittie2d118a2016-11-04 02:23:43 +0900709 ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700710 xfrm_state_put(x);
Steffen Klassertd5860c52014-03-14 07:28:07 +0100711
712 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700713}
714
715static void esp6_destroy(struct xfrm_state *x)
716{
Mathias Krause1c5ad132013-10-18 12:09:05 +0200717 struct crypto_aead *aead = x->data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700718
Mathias Krause1c5ad132013-10-18 12:09:05 +0200719 if (!aead)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700720 return;
721
Mathias Krause1c5ad132013-10-18 12:09:05 +0200722 crypto_free_aead(aead);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700723}
724
Herbert Xu1a6509d2008-01-28 19:37:29 -0800725static int esp_init_aead(struct xfrm_state *x)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700726{
Herbert Xu000ae7b2015-05-27 16:03:47 +0800727 char aead_name[CRYPTO_MAX_ALG_NAME];
Herbert Xu1a6509d2008-01-28 19:37:29 -0800728 struct crypto_aead *aead;
729 int err;
730
Herbert Xu000ae7b2015-05-27 16:03:47 +0800731 err = -ENAMETOOLONG;
732 if (snprintf(aead_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
733 x->geniv, x->aead->alg_name) >= CRYPTO_MAX_ALG_NAME)
734 goto error;
735
Steffen Klassertf58869c2017-12-20 10:41:53 +0100736 aead = crypto_alloc_aead(aead_name, 0, 0);
Herbert Xu1a6509d2008-01-28 19:37:29 -0800737 err = PTR_ERR(aead);
738 if (IS_ERR(aead))
739 goto error;
740
Mathias Krause1c5ad132013-10-18 12:09:05 +0200741 x->data = aead;
Herbert Xu1a6509d2008-01-28 19:37:29 -0800742
743 err = crypto_aead_setkey(aead, x->aead->alg_key,
744 (x->aead->alg_key_len + 7) / 8);
745 if (err)
746 goto error;
747
748 err = crypto_aead_setauthsize(aead, x->aead->alg_icv_len / 8);
749 if (err)
750 goto error;
751
752error:
753 return err;
754}
755
756static int esp_init_authenc(struct xfrm_state *x)
757{
Herbert Xu38320c72008-01-28 19:35:05 -0800758 struct crypto_aead *aead;
759 struct crypto_authenc_key_param *param;
760 struct rtattr *rta;
761 char *key;
762 char *p;
763 char authenc_name[CRYPTO_MAX_ALG_NAME];
Herbert Xu38320c72008-01-28 19:35:05 -0800764 unsigned int keylen;
765 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700766
Herbert Xu1a6509d2008-01-28 19:37:29 -0800767 err = -EINVAL;
Ian Morris63159f22015-03-29 14:00:04 +0100768 if (!x->ealg)
Herbert Xu1a6509d2008-01-28 19:37:29 -0800769 goto error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700770
Herbert Xu1a6509d2008-01-28 19:37:29 -0800771 err = -ENAMETOOLONG;
Steffen Klassertd212a4c2011-03-08 00:07:51 +0000772
773 if ((x->props.flags & XFRM_STATE_ESN)) {
774 if (snprintf(authenc_name, CRYPTO_MAX_ALG_NAME,
Herbert Xu000ae7b2015-05-27 16:03:47 +0800775 "%s%sauthencesn(%s,%s)%s",
776 x->geniv ?: "", x->geniv ? "(" : "",
Steffen Klassertd212a4c2011-03-08 00:07:51 +0000777 x->aalg ? x->aalg->alg_name : "digest_null",
Herbert Xu000ae7b2015-05-27 16:03:47 +0800778 x->ealg->alg_name,
779 x->geniv ? ")" : "") >= CRYPTO_MAX_ALG_NAME)
Steffen Klassertd212a4c2011-03-08 00:07:51 +0000780 goto error;
781 } else {
782 if (snprintf(authenc_name, CRYPTO_MAX_ALG_NAME,
Herbert Xu000ae7b2015-05-27 16:03:47 +0800783 "%s%sauthenc(%s,%s)%s",
784 x->geniv ?: "", x->geniv ? "(" : "",
Steffen Klassertd212a4c2011-03-08 00:07:51 +0000785 x->aalg ? x->aalg->alg_name : "digest_null",
Herbert Xu000ae7b2015-05-27 16:03:47 +0800786 x->ealg->alg_name,
787 x->geniv ? ")" : "") >= CRYPTO_MAX_ALG_NAME)
Steffen Klassertd212a4c2011-03-08 00:07:51 +0000788 goto error;
789 }
Herbert Xu38320c72008-01-28 19:35:05 -0800790
Steffen Klassertf58869c2017-12-20 10:41:53 +0100791 aead = crypto_alloc_aead(authenc_name, 0, 0);
Herbert Xu38320c72008-01-28 19:35:05 -0800792 err = PTR_ERR(aead);
793 if (IS_ERR(aead))
794 goto error;
795
Mathias Krause1c5ad132013-10-18 12:09:05 +0200796 x->data = aead;
Herbert Xu38320c72008-01-28 19:35:05 -0800797
798 keylen = (x->aalg ? (x->aalg->alg_key_len + 7) / 8 : 0) +
799 (x->ealg->alg_key_len + 7) / 8 + RTA_SPACE(sizeof(*param));
800 err = -ENOMEM;
801 key = kmalloc(keylen, GFP_KERNEL);
802 if (!key)
803 goto error;
804
805 p = key;
806 rta = (void *)p;
807 rta->rta_type = CRYPTO_AUTHENC_KEYA_PARAM;
808 rta->rta_len = RTA_LENGTH(sizeof(*param));
809 param = RTA_DATA(rta);
810 p += RTA_SPACE(sizeof(*param));
811
Linus Torvalds1da177e2005-04-16 15:20:36 -0700812 if (x->aalg) {
813 struct xfrm_algo_desc *aalg_desc;
814
Herbert Xu38320c72008-01-28 19:35:05 -0800815 memcpy(p, x->aalg->alg_key, (x->aalg->alg_key_len + 7) / 8);
816 p += (x->aalg->alg_key_len + 7) / 8;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900817
Linus Torvalds1da177e2005-04-16 15:20:36 -0700818 aalg_desc = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
819 BUG_ON(!aalg_desc);
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900820
Herbert Xu38320c72008-01-28 19:35:05 -0800821 err = -EINVAL;
Joe Perches45083492014-11-05 15:36:08 -0800822 if (aalg_desc->uinfo.auth.icv_fullbits / 8 !=
Herbert Xu38320c72008-01-28 19:35:05 -0800823 crypto_aead_authsize(aead)) {
Joe Perches45083492014-11-05 15:36:08 -0800824 pr_info("ESP: %s digestsize %u != %hu\n",
825 x->aalg->alg_name,
826 crypto_aead_authsize(aead),
827 aalg_desc->uinfo.auth.icv_fullbits / 8);
Herbert Xu38320c72008-01-28 19:35:05 -0800828 goto free_key;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700829 }
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900830
Herbert Xu38320c72008-01-28 19:35:05 -0800831 err = crypto_aead_setauthsize(
Martin Willi8f8a0882009-11-25 00:29:53 +0000832 aead, x->aalg->alg_trunc_len / 8);
Herbert Xu38320c72008-01-28 19:35:05 -0800833 if (err)
834 goto free_key;
835 }
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900836
Herbert Xu38320c72008-01-28 19:35:05 -0800837 param->enckeylen = cpu_to_be32((x->ealg->alg_key_len + 7) / 8);
838 memcpy(p, x->ealg->alg_key, (x->ealg->alg_key_len + 7) / 8);
839
840 err = crypto_aead_setkey(aead, key, keylen);
841
842free_key:
843 kfree(key);
844
Herbert Xu1a6509d2008-01-28 19:37:29 -0800845error:
846 return err;
847}
848
849static int esp6_init_state(struct xfrm_state *x)
850{
Herbert Xu1a6509d2008-01-28 19:37:29 -0800851 struct crypto_aead *aead;
852 u32 align;
853 int err;
854
855 if (x->encap)
856 return -EINVAL;
857
Mathias Krause1c5ad132013-10-18 12:09:05 +0200858 x->data = NULL;
Herbert Xu1a6509d2008-01-28 19:37:29 -0800859
860 if (x->aead)
861 err = esp_init_aead(x);
862 else
863 err = esp_init_authenc(x);
864
Herbert Xu38320c72008-01-28 19:35:05 -0800865 if (err)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700866 goto error;
Herbert Xu38320c72008-01-28 19:35:05 -0800867
Mathias Krause1c5ad132013-10-18 12:09:05 +0200868 aead = x->data;
Herbert Xu1a6509d2008-01-28 19:37:29 -0800869
Herbert Xu38320c72008-01-28 19:35:05 -0800870 x->props.header_len = sizeof(struct ip_esp_hdr) +
871 crypto_aead_ivsize(aead);
Herbert Xuca681452007-10-17 21:35:15 -0700872 switch (x->props.mode) {
873 case XFRM_MODE_BEET:
Joakim Koskelaabf5cdb2008-08-06 02:40:25 -0700874 if (x->sel.family != AF_INET6)
875 x->props.header_len += IPV4_BEET_PHMAXLEN +
Ian Morris67ba4152014-08-24 21:53:10 +0100876 (sizeof(struct ipv6hdr) - sizeof(struct iphdr));
Joakim Koskelaabf5cdb2008-08-06 02:40:25 -0700877 break;
Herbert Xubcfd09f2018-01-05 22:12:32 +1100878 default:
Herbert Xuca681452007-10-17 21:35:15 -0700879 case XFRM_MODE_TRANSPORT:
880 break;
881 case XFRM_MODE_TUNNEL:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700882 x->props.header_len += sizeof(struct ipv6hdr);
Masahide NAKAMURAea2c47b2007-10-22 02:30:15 -0700883 break;
Herbert Xuca681452007-10-17 21:35:15 -0700884 }
Herbert Xu38320c72008-01-28 19:35:05 -0800885
886 align = ALIGN(crypto_aead_blocksize(aead), 4);
Mathias Krause1c5ad132013-10-18 12:09:05 +0200887 x->props.trailer_len = align + 1 + crypto_aead_authsize(aead);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700888
889error:
Herbert Xu38320c72008-01-28 19:35:05 -0800890 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700891}
892
Steffen Klassertd5860c52014-03-14 07:28:07 +0100893static int esp6_rcv_cb(struct sk_buff *skb, int err)
894{
895 return 0;
896}
897
Ian Morriscc24bec2014-08-24 21:53:11 +0100898static const struct xfrm_type esp6_type = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700899 .description = "ESP6",
Ian Morriscc24bec2014-08-24 21:53:11 +0100900 .owner = THIS_MODULE,
901 .proto = IPPROTO_ESP,
Herbert Xu436a0a42007-10-08 17:25:53 -0700902 .flags = XFRM_TYPE_REPLAY_PROT,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700903 .init_state = esp6_init_state,
904 .destructor = esp6_destroy,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700905 .input = esp6_input,
Masahide NAKAMURAaee5adb2006-08-23 17:57:28 -0700906 .output = esp6_output,
907 .hdr_offset = xfrm6_find_1stfragopt,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700908};
909
Steffen Klassertd5860c52014-03-14 07:28:07 +0100910static struct xfrm6_protocol esp6_protocol = {
911 .handler = xfrm6_rcv,
912 .cb_handler = esp6_rcv_cb,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700913 .err_handler = esp6_err,
Steffen Klassertd5860c52014-03-14 07:28:07 +0100914 .priority = 0,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700915};
916
917static int __init esp6_init(void)
918{
919 if (xfrm_register_type(&esp6_type, AF_INET6) < 0) {
Joe Perchesf3213832012-05-15 14:11:53 +0000920 pr_info("%s: can't add xfrm type\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700921 return -EAGAIN;
922 }
Steffen Klassertd5860c52014-03-14 07:28:07 +0100923 if (xfrm6_protocol_register(&esp6_protocol, IPPROTO_ESP) < 0) {
Joe Perchesf3213832012-05-15 14:11:53 +0000924 pr_info("%s: can't add protocol\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700925 xfrm_unregister_type(&esp6_type, AF_INET6);
926 return -EAGAIN;
927 }
928
929 return 0;
930}
931
932static void __exit esp6_fini(void)
933{
Steffen Klassertd5860c52014-03-14 07:28:07 +0100934 if (xfrm6_protocol_deregister(&esp6_protocol, IPPROTO_ESP) < 0)
Joe Perchesf3213832012-05-15 14:11:53 +0000935 pr_info("%s: can't remove protocol\n", __func__);
Florian Westphal4f518e82019-05-03 17:46:19 +0200936 xfrm_unregister_type(&esp6_type, AF_INET6);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700937}
938
939module_init(esp6_init);
940module_exit(esp6_fini);
941
942MODULE_LICENSE("GPL");
Masahide NAKAMURAd3d6dd32007-06-26 23:57:49 -0700943MODULE_ALIAS_XFRM_TYPE(AF_INET6, XFRM_PROTO_ESP);