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TOMOYO Linux Cross Reference
Linux/net/ipv4/ah4.c

Version: ~ [ linux-5.7 ] ~ [ linux-5.6.15 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.43 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.125 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.182 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.225 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.225 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.84 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 #define pr_fmt(fmt) "IPsec: " fmt
  2 
  3 #include <crypto/algapi.h>
  4 #include <crypto/hash.h>
  5 #include <linux/err.h>
  6 #include <linux/module.h>
  7 #include <linux/slab.h>
  8 #include <net/ip.h>
  9 #include <net/xfrm.h>
 10 #include <net/ah.h>
 11 #include <linux/crypto.h>
 12 #include <linux/pfkeyv2.h>
 13 #include <linux/scatterlist.h>
 14 #include <net/icmp.h>
 15 #include <net/protocol.h>
 16 
 17 struct ah_skb_cb {
 18         struct xfrm_skb_cb xfrm;
 19         void *tmp;
 20 };
 21 
 22 #define AH_SKB_CB(__skb) ((struct ah_skb_cb *)&((__skb)->cb[0]))
 23 
 24 static void *ah_alloc_tmp(struct crypto_ahash *ahash, int nfrags,
 25                           unsigned int size)
 26 {
 27         unsigned int len;
 28 
 29         len = size + crypto_ahash_digestsize(ahash) +
 30               (crypto_ahash_alignmask(ahash) &
 31                ~(crypto_tfm_ctx_alignment() - 1));
 32 
 33         len = ALIGN(len, crypto_tfm_ctx_alignment());
 34 
 35         len += sizeof(struct ahash_request) + crypto_ahash_reqsize(ahash);
 36         len = ALIGN(len, __alignof__(struct scatterlist));
 37 
 38         len += sizeof(struct scatterlist) * nfrags;
 39 
 40         return kmalloc(len, GFP_ATOMIC);
 41 }
 42 
 43 static inline u8 *ah_tmp_auth(void *tmp, unsigned int offset)
 44 {
 45         return tmp + offset;
 46 }
 47 
 48 static inline u8 *ah_tmp_icv(struct crypto_ahash *ahash, void *tmp,
 49                              unsigned int offset)
 50 {
 51         return PTR_ALIGN((u8 *)tmp + offset, crypto_ahash_alignmask(ahash) + 1);
 52 }
 53 
 54 static inline struct ahash_request *ah_tmp_req(struct crypto_ahash *ahash,
 55                                                u8 *icv)
 56 {
 57         struct ahash_request *req;
 58 
 59         req = (void *)PTR_ALIGN(icv + crypto_ahash_digestsize(ahash),
 60                                 crypto_tfm_ctx_alignment());
 61 
 62         ahash_request_set_tfm(req, ahash);
 63 
 64         return req;
 65 }
 66 
 67 static inline struct scatterlist *ah_req_sg(struct crypto_ahash *ahash,
 68                                              struct ahash_request *req)
 69 {
 70         return (void *)ALIGN((unsigned long)(req + 1) +
 71                              crypto_ahash_reqsize(ahash),
 72                              __alignof__(struct scatterlist));
 73 }
 74 
 75 /* Clear mutable options and find final destination to substitute
 76  * into IP header for icv calculation. Options are already checked
 77  * for validity, so paranoia is not required. */
 78 
 79 static int ip_clear_mutable_options(const struct iphdr *iph, __be32 *daddr)
 80 {
 81         unsigned char *optptr = (unsigned char *)(iph+1);
 82         int  l = iph->ihl*4 - sizeof(struct iphdr);
 83         int  optlen;
 84 
 85         while (l > 0) {
 86                 switch (*optptr) {
 87                 case IPOPT_END:
 88                         return 0;
 89                 case IPOPT_NOOP:
 90                         l--;
 91                         optptr++;
 92                         continue;
 93                 }
 94                 optlen = optptr[1];
 95                 if (optlen<2 || optlen>l)
 96                         return -EINVAL;
 97                 switch (*optptr) {
 98                 case IPOPT_SEC:
 99                 case 0x85:      /* Some "Extended Security" crap. */
100                 case IPOPT_CIPSO:
101                 case IPOPT_RA:
102                 case 0x80|21:   /* RFC1770 */
103                         break;
104                 case IPOPT_LSRR:
105                 case IPOPT_SSRR:
106                         if (optlen < 6)
107                                 return -EINVAL;
108                         memcpy(daddr, optptr+optlen-4, 4);
109                         /* Fall through */
110                 default:
111                         memset(optptr, 0, optlen);
112                 }
113                 l -= optlen;
114                 optptr += optlen;
115         }
116         return 0;
117 }
118 
119 static void ah_output_done(struct crypto_async_request *base, int err)
120 {
121         u8 *icv;
122         struct iphdr *iph;
123         struct sk_buff *skb = base->data;
124         struct xfrm_state *x = skb_dst(skb)->xfrm;
125         struct ah_data *ahp = x->data;
126         struct iphdr *top_iph = ip_hdr(skb);
127         struct ip_auth_hdr *ah = ip_auth_hdr(skb);
128         int ihl = ip_hdrlen(skb);
129 
130         iph = AH_SKB_CB(skb)->tmp;
131         icv = ah_tmp_icv(ahp->ahash, iph, ihl);
132         memcpy(ah->auth_data, icv, ahp->icv_trunc_len);
133 
134         top_iph->tos = iph->tos;
135         top_iph->ttl = iph->ttl;
136         top_iph->frag_off = iph->frag_off;
137         if (top_iph->ihl != 5) {
138                 top_iph->daddr = iph->daddr;
139                 memcpy(top_iph+1, iph+1, top_iph->ihl*4 - sizeof(struct iphdr));
140         }
141 
142         kfree(AH_SKB_CB(skb)->tmp);
143         xfrm_output_resume(skb, err);
144 }
145 
146 static int ah_output(struct xfrm_state *x, struct sk_buff *skb)
147 {
148         int err;
149         int nfrags;
150         int ihl;
151         u8 *icv;
152         struct sk_buff *trailer;
153         struct crypto_ahash *ahash;
154         struct ahash_request *req;
155         struct scatterlist *sg;
156         struct iphdr *iph, *top_iph;
157         struct ip_auth_hdr *ah;
158         struct ah_data *ahp;
159         int seqhi_len = 0;
160         __be32 *seqhi;
161         int sglists = 0;
162         struct scatterlist *seqhisg;
163 
164         ahp = x->data;
165         ahash = ahp->ahash;
166 
167         if ((err = skb_cow_data(skb, 0, &trailer)) < 0)
168                 goto out;
169         nfrags = err;
170 
171         skb_push(skb, -skb_network_offset(skb));
172         ah = ip_auth_hdr(skb);
173         ihl = ip_hdrlen(skb);
174 
175         if (x->props.flags & XFRM_STATE_ESN) {
176                 sglists = 1;
177                 seqhi_len = sizeof(*seqhi);
178         }
179         err = -ENOMEM;
180         iph = ah_alloc_tmp(ahash, nfrags + sglists, ihl + seqhi_len);
181         if (!iph)
182                 goto out;
183         seqhi = (__be32 *)((char *)iph + ihl);
184         icv = ah_tmp_icv(ahash, seqhi, seqhi_len);
185         req = ah_tmp_req(ahash, icv);
186         sg = ah_req_sg(ahash, req);
187         seqhisg = sg + nfrags;
188 
189         memset(ah->auth_data, 0, ahp->icv_trunc_len);
190 
191         top_iph = ip_hdr(skb);
192 
193         iph->tos = top_iph->tos;
194         iph->ttl = top_iph->ttl;
195         iph->frag_off = top_iph->frag_off;
196 
197         if (top_iph->ihl != 5) {
198                 iph->daddr = top_iph->daddr;
199                 memcpy(iph+1, top_iph+1, top_iph->ihl*4 - sizeof(struct iphdr));
200                 err = ip_clear_mutable_options(top_iph, &top_iph->daddr);
201                 if (err)
202                         goto out_free;
203         }
204 
205         ah->nexthdr = *skb_mac_header(skb);
206         *skb_mac_header(skb) = IPPROTO_AH;
207 
208         top_iph->tos = 0;
209         top_iph->tot_len = htons(skb->len);
210         top_iph->frag_off = 0;
211         top_iph->ttl = 0;
212         top_iph->check = 0;
213 
214         if (x->props.flags & XFRM_STATE_ALIGN4)
215                 ah->hdrlen  = (XFRM_ALIGN4(sizeof(*ah) + ahp->icv_trunc_len) >> 2) - 2;
216         else
217                 ah->hdrlen  = (XFRM_ALIGN8(sizeof(*ah) + ahp->icv_trunc_len) >> 2) - 2;
218 
219         ah->reserved = 0;
220         ah->spi = x->id.spi;
221         ah->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.low);
222 
223         sg_init_table(sg, nfrags + sglists);
224         err = skb_to_sgvec_nomark(skb, sg, 0, skb->len);
225         if (unlikely(err < 0))
226                 goto out_free;
227 
228         if (x->props.flags & XFRM_STATE_ESN) {
229                 /* Attach seqhi sg right after packet payload */
230                 *seqhi = htonl(XFRM_SKB_CB(skb)->seq.output.hi);
231                 sg_set_buf(seqhisg, seqhi, seqhi_len);
232         }
233         ahash_request_set_crypt(req, sg, icv, skb->len + seqhi_len);
234         ahash_request_set_callback(req, 0, ah_output_done, skb);
235 
236         AH_SKB_CB(skb)->tmp = iph;
237 
238         err = crypto_ahash_digest(req);
239         if (err) {
240                 if (err == -EINPROGRESS)
241                         goto out;
242 
243                 if (err == -ENOSPC)
244                         err = NET_XMIT_DROP;
245                 goto out_free;
246         }
247 
248         memcpy(ah->auth_data, icv, ahp->icv_trunc_len);
249 
250         top_iph->tos = iph->tos;
251         top_iph->ttl = iph->ttl;
252         top_iph->frag_off = iph->frag_off;
253         if (top_iph->ihl != 5) {
254                 top_iph->daddr = iph->daddr;
255                 memcpy(top_iph+1, iph+1, top_iph->ihl*4 - sizeof(struct iphdr));
256         }
257 
258 out_free:
259         kfree(iph);
260 out:
261         return err;
262 }
263 
264 static void ah_input_done(struct crypto_async_request *base, int err)
265 {
266         u8 *auth_data;
267         u8 *icv;
268         struct iphdr *work_iph;
269         struct sk_buff *skb = base->data;
270         struct xfrm_state *x = xfrm_input_state(skb);
271         struct ah_data *ahp = x->data;
272         struct ip_auth_hdr *ah = ip_auth_hdr(skb);
273         int ihl = ip_hdrlen(skb);
274         int ah_hlen = (ah->hdrlen + 2) << 2;
275 
276         if (err)
277                 goto out;
278 
279         work_iph = AH_SKB_CB(skb)->tmp;
280         auth_data = ah_tmp_auth(work_iph, ihl);
281         icv = ah_tmp_icv(ahp->ahash, auth_data, ahp->icv_trunc_len);
282 
283         err = crypto_memneq(icv, auth_data, ahp->icv_trunc_len) ? -EBADMSG : 0;
284         if (err)
285                 goto out;
286 
287         err = ah->nexthdr;
288 
289         skb->network_header += ah_hlen;
290         memcpy(skb_network_header(skb), work_iph, ihl);
291         __skb_pull(skb, ah_hlen + ihl);
292 
293         if (x->props.mode == XFRM_MODE_TUNNEL)
294                 skb_reset_transport_header(skb);
295         else
296                 skb_set_transport_header(skb, -ihl);
297 out:
298         kfree(AH_SKB_CB(skb)->tmp);
299         xfrm_input_resume(skb, err);
300 }
301 
302 static int ah_input(struct xfrm_state *x, struct sk_buff *skb)
303 {
304         int ah_hlen;
305         int ihl;
306         int nexthdr;
307         int nfrags;
308         u8 *auth_data;
309         u8 *icv;
310         struct sk_buff *trailer;
311         struct crypto_ahash *ahash;
312         struct ahash_request *req;
313         struct scatterlist *sg;
314         struct iphdr *iph, *work_iph;
315         struct ip_auth_hdr *ah;
316         struct ah_data *ahp;
317         int err = -ENOMEM;
318         int seqhi_len = 0;
319         __be32 *seqhi;
320         int sglists = 0;
321         struct scatterlist *seqhisg;
322 
323         if (!pskb_may_pull(skb, sizeof(*ah)))
324                 goto out;
325 
326         ah = (struct ip_auth_hdr *)skb->data;
327         ahp = x->data;
328         ahash = ahp->ahash;
329 
330         nexthdr = ah->nexthdr;
331         ah_hlen = (ah->hdrlen + 2) << 2;
332 
333         if (x->props.flags & XFRM_STATE_ALIGN4) {
334                 if (ah_hlen != XFRM_ALIGN4(sizeof(*ah) + ahp->icv_full_len) &&
335                     ah_hlen != XFRM_ALIGN4(sizeof(*ah) + ahp->icv_trunc_len))
336                         goto out;
337         } else {
338                 if (ah_hlen != XFRM_ALIGN8(sizeof(*ah) + ahp->icv_full_len) &&
339                     ah_hlen != XFRM_ALIGN8(sizeof(*ah) + ahp->icv_trunc_len))
340                         goto out;
341         }
342 
343         if (!pskb_may_pull(skb, ah_hlen))
344                 goto out;
345 
346         /* We are going to _remove_ AH header to keep sockets happy,
347          * so... Later this can change. */
348         if (skb_unclone(skb, GFP_ATOMIC))
349                 goto out;
350 
351         skb->ip_summed = CHECKSUM_NONE;
352 
353 
354         if ((err = skb_cow_data(skb, 0, &trailer)) < 0)
355                 goto out;
356         nfrags = err;
357 
358         ah = (struct ip_auth_hdr *)skb->data;
359         iph = ip_hdr(skb);
360         ihl = ip_hdrlen(skb);
361 
362         if (x->props.flags & XFRM_STATE_ESN) {
363                 sglists = 1;
364                 seqhi_len = sizeof(*seqhi);
365         }
366 
367         work_iph = ah_alloc_tmp(ahash, nfrags + sglists, ihl +
368                                 ahp->icv_trunc_len + seqhi_len);
369         if (!work_iph) {
370                 err = -ENOMEM;
371                 goto out;
372         }
373 
374         seqhi = (__be32 *)((char *)work_iph + ihl);
375         auth_data = ah_tmp_auth(seqhi, seqhi_len);
376         icv = ah_tmp_icv(ahash, auth_data, ahp->icv_trunc_len);
377         req = ah_tmp_req(ahash, icv);
378         sg = ah_req_sg(ahash, req);
379         seqhisg = sg + nfrags;
380 
381         memcpy(work_iph, iph, ihl);
382         memcpy(auth_data, ah->auth_data, ahp->icv_trunc_len);
383         memset(ah->auth_data, 0, ahp->icv_trunc_len);
384 
385         iph->ttl = 0;
386         iph->tos = 0;
387         iph->frag_off = 0;
388         iph->check = 0;
389         if (ihl > sizeof(*iph)) {
390                 __be32 dummy;
391                 err = ip_clear_mutable_options(iph, &dummy);
392                 if (err)
393                         goto out_free;
394         }
395 
396         skb_push(skb, ihl);
397 
398         sg_init_table(sg, nfrags + sglists);
399         err = skb_to_sgvec_nomark(skb, sg, 0, skb->len);
400         if (unlikely(err < 0))
401                 goto out_free;
402 
403         if (x->props.flags & XFRM_STATE_ESN) {
404                 /* Attach seqhi sg right after packet payload */
405                 *seqhi = XFRM_SKB_CB(skb)->seq.input.hi;
406                 sg_set_buf(seqhisg, seqhi, seqhi_len);
407         }
408         ahash_request_set_crypt(req, sg, icv, skb->len + seqhi_len);
409         ahash_request_set_callback(req, 0, ah_input_done, skb);
410 
411         AH_SKB_CB(skb)->tmp = work_iph;
412 
413         err = crypto_ahash_digest(req);
414         if (err) {
415                 if (err == -EINPROGRESS)
416                         goto out;
417 
418                 goto out_free;
419         }
420 
421         err = crypto_memneq(icv, auth_data, ahp->icv_trunc_len) ? -EBADMSG : 0;
422         if (err)
423                 goto out_free;
424 
425         skb->network_header += ah_hlen;
426         memcpy(skb_network_header(skb), work_iph, ihl);
427         __skb_pull(skb, ah_hlen + ihl);
428         if (x->props.mode == XFRM_MODE_TUNNEL)
429                 skb_reset_transport_header(skb);
430         else
431                 skb_set_transport_header(skb, -ihl);
432 
433         err = nexthdr;
434 
435 out_free:
436         kfree (work_iph);
437 out:
438         return err;
439 }
440 
441 static int ah4_err(struct sk_buff *skb, u32 info)
442 {
443         struct net *net = dev_net(skb->dev);
444         const struct iphdr *iph = (const struct iphdr *)skb->data;
445         struct ip_auth_hdr *ah = (struct ip_auth_hdr *)(skb->data+(iph->ihl<<2));
446         struct xfrm_state *x;
447 
448         switch (icmp_hdr(skb)->type) {
449         case ICMP_DEST_UNREACH:
450                 if (icmp_hdr(skb)->code != ICMP_FRAG_NEEDED)
451                         return 0;
452         case ICMP_REDIRECT:
453                 break;
454         default:
455                 return 0;
456         }
457 
458         x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr,
459                               ah->spi, IPPROTO_AH, AF_INET);
460         if (!x)
461                 return 0;
462 
463         if (icmp_hdr(skb)->type == ICMP_DEST_UNREACH)
464                 ipv4_update_pmtu(skb, net, info, 0, IPPROTO_AH);
465         else
466                 ipv4_redirect(skb, net, 0, IPPROTO_AH);
467         xfrm_state_put(x);
468 
469         return 0;
470 }
471 
472 static int ah_init_state(struct xfrm_state *x)
473 {
474         struct ah_data *ahp = NULL;
475         struct xfrm_algo_desc *aalg_desc;
476         struct crypto_ahash *ahash;
477 
478         if (!x->aalg)
479                 goto error;
480 
481         if (x->encap)
482                 goto error;
483 
484         ahp = kzalloc(sizeof(*ahp), GFP_KERNEL);
485         if (!ahp)
486                 return -ENOMEM;
487 
488         ahash = crypto_alloc_ahash(x->aalg->alg_name, 0, 0);
489         if (IS_ERR(ahash))
490                 goto error;
491 
492         ahp->ahash = ahash;
493         if (crypto_ahash_setkey(ahash, x->aalg->alg_key,
494                                 (x->aalg->alg_key_len + 7) / 8))
495                 goto error;
496 
497         /*
498          * Lookup the algorithm description maintained by xfrm_algo,
499          * verify crypto transform properties, and store information
500          * we need for AH processing.  This lookup cannot fail here
501          * after a successful crypto_alloc_ahash().
502          */
503         aalg_desc = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
504         BUG_ON(!aalg_desc);
505 
506         if (aalg_desc->uinfo.auth.icv_fullbits/8 !=
507             crypto_ahash_digestsize(ahash)) {
508                 pr_info("%s: %s digestsize %u != %hu\n",
509                         __func__, x->aalg->alg_name,
510                         crypto_ahash_digestsize(ahash),
511                         aalg_desc->uinfo.auth.icv_fullbits / 8);
512                 goto error;
513         }
514 
515         ahp->icv_full_len = aalg_desc->uinfo.auth.icv_fullbits/8;
516         ahp->icv_trunc_len = x->aalg->alg_trunc_len/8;
517 
518         if (x->props.flags & XFRM_STATE_ALIGN4)
519                 x->props.header_len = XFRM_ALIGN4(sizeof(struct ip_auth_hdr) +
520                                                   ahp->icv_trunc_len);
521         else
522                 x->props.header_len = XFRM_ALIGN8(sizeof(struct ip_auth_hdr) +
523                                                   ahp->icv_trunc_len);
524         if (x->props.mode == XFRM_MODE_TUNNEL)
525                 x->props.header_len += sizeof(struct iphdr);
526         x->data = ahp;
527 
528         return 0;
529 
530 error:
531         if (ahp) {
532                 crypto_free_ahash(ahp->ahash);
533                 kfree(ahp);
534         }
535         return -EINVAL;
536 }
537 
538 static void ah_destroy(struct xfrm_state *x)
539 {
540         struct ah_data *ahp = x->data;
541 
542         if (!ahp)
543                 return;
544 
545         crypto_free_ahash(ahp->ahash);
546         kfree(ahp);
547 }
548 
549 static int ah4_rcv_cb(struct sk_buff *skb, int err)
550 {
551         return 0;
552 }
553 
554 static const struct xfrm_type ah_type =
555 {
556         .description    = "AH4",
557         .owner          = THIS_MODULE,
558         .proto          = IPPROTO_AH,
559         .flags          = XFRM_TYPE_REPLAY_PROT,
560         .init_state     = ah_init_state,
561         .destructor     = ah_destroy,
562         .input          = ah_input,
563         .output         = ah_output
564 };
565 
566 static struct xfrm4_protocol ah4_protocol = {
567         .handler        =       xfrm4_rcv,
568         .input_handler  =       xfrm_input,
569         .cb_handler     =       ah4_rcv_cb,
570         .err_handler    =       ah4_err,
571         .priority       =       0,
572 };
573 
574 static int __init ah4_init(void)
575 {
576         if (xfrm_register_type(&ah_type, AF_INET) < 0) {
577                 pr_info("%s: can't add xfrm type\n", __func__);
578                 return -EAGAIN;
579         }
580         if (xfrm4_protocol_register(&ah4_protocol, IPPROTO_AH) < 0) {
581                 pr_info("%s: can't add protocol\n", __func__);
582                 xfrm_unregister_type(&ah_type, AF_INET);
583                 return -EAGAIN;
584         }
585         return 0;
586 }
587 
588 static void __exit ah4_fini(void)
589 {
590         if (xfrm4_protocol_deregister(&ah4_protocol, IPPROTO_AH) < 0)
591                 pr_info("%s: can't remove protocol\n", __func__);
592         if (xfrm_unregister_type(&ah_type, AF_INET) < 0)
593                 pr_info("%s: can't remove xfrm type\n", __func__);
594 }
595 
596 module_init(ah4_init);
597 module_exit(ah4_fini);
598 MODULE_LICENSE("GPL");
599 MODULE_ALIAS_XFRM_TYPE(AF_INET, XFRM_PROTO_AH);
600 

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