~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/net/xfrm/xfrm_input.c

Version: ~ [ linux-5.1-rc1 ] ~ [ linux-5.0.3 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.30 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.107 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.164 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.176 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.136 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.63 ] ~ [ 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-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.39.4 ] ~ [ linux-2.6.38.8 ] ~ [ linux-2.6.37.6 ] ~ [ linux-2.6.36.4 ] ~ [ linux-2.6.35.14 ] ~ [ linux-2.6.34.15 ] ~ [ linux-2.6.33.20 ] ~ [ 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 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  * xfrm_input.c
  4  *
  5  * Changes:
  6  *      YOSHIFUJI Hideaki @USAGI
  7  *              Split up af-specific portion
  8  *
  9  */
 10 
 11 #include <linux/bottom_half.h>
 12 #include <linux/cache.h>
 13 #include <linux/interrupt.h>
 14 #include <linux/slab.h>
 15 #include <linux/module.h>
 16 #include <linux/netdevice.h>
 17 #include <linux/percpu.h>
 18 #include <net/dst.h>
 19 #include <net/ip.h>
 20 #include <net/xfrm.h>
 21 #include <net/ip_tunnels.h>
 22 #include <net/ip6_tunnel.h>
 23 
 24 struct xfrm_trans_tasklet {
 25         struct tasklet_struct tasklet;
 26         struct sk_buff_head queue;
 27 };
 28 
 29 struct xfrm_trans_cb {
 30         union {
 31                 struct inet_skb_parm    h4;
 32 #if IS_ENABLED(CONFIG_IPV6)
 33                 struct inet6_skb_parm   h6;
 34 #endif
 35         } header;
 36         int (*finish)(struct net *net, struct sock *sk, struct sk_buff *skb);
 37 };
 38 
 39 #define XFRM_TRANS_SKB_CB(__skb) ((struct xfrm_trans_cb *)&((__skb)->cb[0]))
 40 
 41 static DEFINE_SPINLOCK(xfrm_input_afinfo_lock);
 42 static struct xfrm_input_afinfo const __rcu *xfrm_input_afinfo[AF_INET6 + 1];
 43 
 44 static struct gro_cells gro_cells;
 45 static struct net_device xfrm_napi_dev;
 46 
 47 static DEFINE_PER_CPU(struct xfrm_trans_tasklet, xfrm_trans_tasklet);
 48 
 49 int xfrm_input_register_afinfo(const struct xfrm_input_afinfo *afinfo)
 50 {
 51         int err = 0;
 52 
 53         if (WARN_ON(afinfo->family >= ARRAY_SIZE(xfrm_input_afinfo)))
 54                 return -EAFNOSUPPORT;
 55 
 56         spin_lock_bh(&xfrm_input_afinfo_lock);
 57         if (unlikely(xfrm_input_afinfo[afinfo->family] != NULL))
 58                 err = -EEXIST;
 59         else
 60                 rcu_assign_pointer(xfrm_input_afinfo[afinfo->family], afinfo);
 61         spin_unlock_bh(&xfrm_input_afinfo_lock);
 62         return err;
 63 }
 64 EXPORT_SYMBOL(xfrm_input_register_afinfo);
 65 
 66 int xfrm_input_unregister_afinfo(const struct xfrm_input_afinfo *afinfo)
 67 {
 68         int err = 0;
 69 
 70         spin_lock_bh(&xfrm_input_afinfo_lock);
 71         if (likely(xfrm_input_afinfo[afinfo->family] != NULL)) {
 72                 if (unlikely(xfrm_input_afinfo[afinfo->family] != afinfo))
 73                         err = -EINVAL;
 74                 else
 75                         RCU_INIT_POINTER(xfrm_input_afinfo[afinfo->family], NULL);
 76         }
 77         spin_unlock_bh(&xfrm_input_afinfo_lock);
 78         synchronize_rcu();
 79         return err;
 80 }
 81 EXPORT_SYMBOL(xfrm_input_unregister_afinfo);
 82 
 83 static const struct xfrm_input_afinfo *xfrm_input_get_afinfo(unsigned int family)
 84 {
 85         const struct xfrm_input_afinfo *afinfo;
 86 
 87         if (WARN_ON_ONCE(family >= ARRAY_SIZE(xfrm_input_afinfo)))
 88                 return NULL;
 89 
 90         rcu_read_lock();
 91         afinfo = rcu_dereference(xfrm_input_afinfo[family]);
 92         if (unlikely(!afinfo))
 93                 rcu_read_unlock();
 94         return afinfo;
 95 }
 96 
 97 static int xfrm_rcv_cb(struct sk_buff *skb, unsigned int family, u8 protocol,
 98                        int err)
 99 {
100         int ret;
101         const struct xfrm_input_afinfo *afinfo = xfrm_input_get_afinfo(family);
102 
103         if (!afinfo)
104                 return -EAFNOSUPPORT;
105 
106         ret = afinfo->callback(skb, protocol, err);
107         rcu_read_unlock();
108 
109         return ret;
110 }
111 
112 struct sec_path *secpath_set(struct sk_buff *skb)
113 {
114         struct sec_path *sp, *tmp = skb_ext_find(skb, SKB_EXT_SEC_PATH);
115 
116         sp = skb_ext_add(skb, SKB_EXT_SEC_PATH);
117         if (!sp)
118                 return NULL;
119 
120         if (tmp) /* reused existing one (was COW'd if needed) */
121                 return sp;
122 
123         /* allocated new secpath */
124         memset(sp->ovec, 0, sizeof(sp->ovec));
125         sp->olen = 0;
126         sp->len = 0;
127 
128         return sp;
129 }
130 EXPORT_SYMBOL(secpath_set);
131 
132 /* Fetch spi and seq from ipsec header */
133 
134 int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq)
135 {
136         int offset, offset_seq;
137         int hlen;
138 
139         switch (nexthdr) {
140         case IPPROTO_AH:
141                 hlen = sizeof(struct ip_auth_hdr);
142                 offset = offsetof(struct ip_auth_hdr, spi);
143                 offset_seq = offsetof(struct ip_auth_hdr, seq_no);
144                 break;
145         case IPPROTO_ESP:
146                 hlen = sizeof(struct ip_esp_hdr);
147                 offset = offsetof(struct ip_esp_hdr, spi);
148                 offset_seq = offsetof(struct ip_esp_hdr, seq_no);
149                 break;
150         case IPPROTO_COMP:
151                 if (!pskb_may_pull(skb, sizeof(struct ip_comp_hdr)))
152                         return -EINVAL;
153                 *spi = htonl(ntohs(*(__be16 *)(skb_transport_header(skb) + 2)));
154                 *seq = 0;
155                 return 0;
156         default:
157                 return 1;
158         }
159 
160         if (!pskb_may_pull(skb, hlen))
161                 return -EINVAL;
162 
163         *spi = *(__be32 *)(skb_transport_header(skb) + offset);
164         *seq = *(__be32 *)(skb_transport_header(skb) + offset_seq);
165         return 0;
166 }
167 EXPORT_SYMBOL(xfrm_parse_spi);
168 
169 int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb)
170 {
171         struct xfrm_mode *inner_mode = x->inner_mode;
172         int err;
173 
174         err = x->outer_mode->afinfo->extract_input(x, skb);
175         if (err)
176                 return err;
177 
178         if (x->sel.family == AF_UNSPEC) {
179                 inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol);
180                 if (inner_mode == NULL)
181                         return -EAFNOSUPPORT;
182         }
183 
184         skb->protocol = inner_mode->afinfo->eth_proto;
185         return inner_mode->input2(x, skb);
186 }
187 EXPORT_SYMBOL(xfrm_prepare_input);
188 
189 int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type)
190 {
191         struct net *net = dev_net(skb->dev);
192         int err;
193         __be32 seq;
194         __be32 seq_hi;
195         struct xfrm_state *x = NULL;
196         xfrm_address_t *daddr;
197         struct xfrm_mode *inner_mode;
198         u32 mark = skb->mark;
199         unsigned int family = AF_UNSPEC;
200         int decaps = 0;
201         int async = 0;
202         bool xfrm_gro = false;
203         bool crypto_done = false;
204         struct xfrm_offload *xo = xfrm_offload(skb);
205         struct sec_path *sp;
206 
207         if (encap_type < 0) {
208                 x = xfrm_input_state(skb);
209 
210                 if (unlikely(x->km.state != XFRM_STATE_VALID)) {
211                         if (x->km.state == XFRM_STATE_ACQ)
212                                 XFRM_INC_STATS(net, LINUX_MIB_XFRMACQUIREERROR);
213                         else
214                                 XFRM_INC_STATS(net,
215                                                LINUX_MIB_XFRMINSTATEINVALID);
216                         goto drop;
217                 }
218 
219                 family = x->outer_mode->afinfo->family;
220 
221                 /* An encap_type of -1 indicates async resumption. */
222                 if (encap_type == -1) {
223                         async = 1;
224                         seq = XFRM_SKB_CB(skb)->seq.input.low;
225                         goto resume;
226                 }
227 
228                 /* encap_type < -1 indicates a GRO call. */
229                 encap_type = 0;
230                 seq = XFRM_SPI_SKB_CB(skb)->seq;
231 
232                 if (xo && (xo->flags & CRYPTO_DONE)) {
233                         crypto_done = true;
234                         family = XFRM_SPI_SKB_CB(skb)->family;
235 
236                         if (!(xo->status & CRYPTO_SUCCESS)) {
237                                 if (xo->status &
238                                     (CRYPTO_TRANSPORT_AH_AUTH_FAILED |
239                                      CRYPTO_TRANSPORT_ESP_AUTH_FAILED |
240                                      CRYPTO_TUNNEL_AH_AUTH_FAILED |
241                                      CRYPTO_TUNNEL_ESP_AUTH_FAILED)) {
242 
243                                         xfrm_audit_state_icvfail(x, skb,
244                                                                  x->type->proto);
245                                         x->stats.integrity_failed++;
246                                         XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEPROTOERROR);
247                                         goto drop;
248                                 }
249 
250                                 if (xo->status & CRYPTO_INVALID_PROTOCOL) {
251                                         XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEPROTOERROR);
252                                         goto drop;
253                                 }
254 
255                                 XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR);
256                                 goto drop;
257                         }
258 
259                         if ((err = xfrm_parse_spi(skb, nexthdr, &spi, &seq)) != 0) {
260                                 XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR);
261                                 goto drop;
262                         }
263                 }
264 
265                 goto lock;
266         }
267 
268         family = XFRM_SPI_SKB_CB(skb)->family;
269 
270         /* if tunnel is present override skb->mark value with tunnel i_key */
271         switch (family) {
272         case AF_INET:
273                 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4)
274                         mark = be32_to_cpu(XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4->parms.i_key);
275                 break;
276         case AF_INET6:
277                 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6)
278                         mark = be32_to_cpu(XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6->parms.i_key);
279                 break;
280         }
281 
282         sp = secpath_set(skb);
283         if (!sp) {
284                 XFRM_INC_STATS(net, LINUX_MIB_XFRMINERROR);
285                 goto drop;
286         }
287 
288         seq = 0;
289         if (!spi && (err = xfrm_parse_spi(skb, nexthdr, &spi, &seq)) != 0) {
290                 secpath_reset(skb);
291                 XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR);
292                 goto drop;
293         }
294 
295         daddr = (xfrm_address_t *)(skb_network_header(skb) +
296                                    XFRM_SPI_SKB_CB(skb)->daddroff);
297         do {
298                 sp = skb_sec_path(skb);
299 
300                 if (sp->len == XFRM_MAX_DEPTH) {
301                         secpath_reset(skb);
302                         XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR);
303                         goto drop;
304                 }
305 
306                 x = xfrm_state_lookup(net, mark, daddr, spi, nexthdr, family);
307                 if (x == NULL) {
308                         secpath_reset(skb);
309                         XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOSTATES);
310                         xfrm_audit_state_notfound(skb, family, spi, seq);
311                         goto drop;
312                 }
313 
314                 skb->mark = xfrm_smark_get(skb->mark, x);
315 
316                 sp->xvec[sp->len++] = x;
317 
318                 skb_dst_force(skb);
319                 if (!skb_dst(skb)) {
320                         XFRM_INC_STATS(net, LINUX_MIB_XFRMINERROR);
321                         goto drop;
322                 }
323 
324 lock:
325                 spin_lock(&x->lock);
326 
327                 if (unlikely(x->km.state != XFRM_STATE_VALID)) {
328                         if (x->km.state == XFRM_STATE_ACQ)
329                                 XFRM_INC_STATS(net, LINUX_MIB_XFRMACQUIREERROR);
330                         else
331                                 XFRM_INC_STATS(net,
332                                                LINUX_MIB_XFRMINSTATEINVALID);
333                         goto drop_unlock;
334                 }
335 
336                 if ((x->encap ? x->encap->encap_type : 0) != encap_type) {
337                         XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMISMATCH);
338                         goto drop_unlock;
339                 }
340 
341                 if (x->repl->check(x, skb, seq)) {
342                         XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATESEQERROR);
343                         goto drop_unlock;
344                 }
345 
346                 if (xfrm_state_check_expire(x)) {
347                         XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEEXPIRED);
348                         goto drop_unlock;
349                 }
350 
351                 spin_unlock(&x->lock);
352 
353                 if (xfrm_tunnel_check(skb, x, family)) {
354                         XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMODEERROR);
355                         goto drop;
356                 }
357 
358                 seq_hi = htonl(xfrm_replay_seqhi(x, seq));
359 
360                 XFRM_SKB_CB(skb)->seq.input.low = seq;
361                 XFRM_SKB_CB(skb)->seq.input.hi = seq_hi;
362 
363                 dev_hold(skb->dev);
364 
365                 if (crypto_done)
366                         nexthdr = x->type_offload->input_tail(x, skb);
367                 else
368                         nexthdr = x->type->input(x, skb);
369 
370                 if (nexthdr == -EINPROGRESS)
371                         return 0;
372 resume:
373                 dev_put(skb->dev);
374 
375                 spin_lock(&x->lock);
376                 if (nexthdr <= 0) {
377                         if (nexthdr == -EBADMSG) {
378                                 xfrm_audit_state_icvfail(x, skb,
379                                                          x->type->proto);
380                                 x->stats.integrity_failed++;
381                         }
382                         XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEPROTOERROR);
383                         goto drop_unlock;
384                 }
385 
386                 /* only the first xfrm gets the encap type */
387                 encap_type = 0;
388 
389                 if (async && x->repl->recheck(x, skb, seq)) {
390                         XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATESEQERROR);
391                         goto drop_unlock;
392                 }
393 
394                 x->repl->advance(x, seq);
395 
396                 x->curlft.bytes += skb->len;
397                 x->curlft.packets++;
398 
399                 spin_unlock(&x->lock);
400 
401                 XFRM_MODE_SKB_CB(skb)->protocol = nexthdr;
402 
403                 inner_mode = x->inner_mode;
404 
405                 if (x->sel.family == AF_UNSPEC) {
406                         inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol);
407                         if (inner_mode == NULL) {
408                                 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMODEERROR);
409                                 goto drop;
410                         }
411                 }
412 
413                 if (inner_mode->input(x, skb)) {
414                         XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMODEERROR);
415                         goto drop;
416                 }
417 
418                 if (x->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL) {
419                         decaps = 1;
420                         break;
421                 }
422 
423                 /*
424                  * We need the inner address.  However, we only get here for
425                  * transport mode so the outer address is identical.
426                  */
427                 daddr = &x->id.daddr;
428                 family = x->outer_mode->afinfo->family;
429 
430                 err = xfrm_parse_spi(skb, nexthdr, &spi, &seq);
431                 if (err < 0) {
432                         XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR);
433                         goto drop;
434                 }
435                 crypto_done = false;
436         } while (!err);
437 
438         err = xfrm_rcv_cb(skb, family, x->type->proto, 0);
439         if (err)
440                 goto drop;
441 
442         nf_reset(skb);
443 
444         if (decaps) {
445                 sp = skb_sec_path(skb);
446                 if (sp)
447                         sp->olen = 0;
448                 skb_dst_drop(skb);
449                 gro_cells_receive(&gro_cells, skb);
450                 return 0;
451         } else {
452                 xo = xfrm_offload(skb);
453                 if (xo)
454                         xfrm_gro = xo->flags & XFRM_GRO;
455 
456                 err = x->inner_mode->afinfo->transport_finish(skb, xfrm_gro || async);
457                 if (xfrm_gro) {
458                         sp = skb_sec_path(skb);
459                         if (sp)
460                                 sp->olen = 0;
461                         skb_dst_drop(skb);
462                         gro_cells_receive(&gro_cells, skb);
463                         return err;
464                 }
465 
466                 return err;
467         }
468 
469 drop_unlock:
470         spin_unlock(&x->lock);
471 drop:
472         xfrm_rcv_cb(skb, family, x && x->type ? x->type->proto : nexthdr, -1);
473         kfree_skb(skb);
474         return 0;
475 }
476 EXPORT_SYMBOL(xfrm_input);
477 
478 int xfrm_input_resume(struct sk_buff *skb, int nexthdr)
479 {
480         return xfrm_input(skb, nexthdr, 0, -1);
481 }
482 EXPORT_SYMBOL(xfrm_input_resume);
483 
484 static void xfrm_trans_reinject(unsigned long data)
485 {
486         struct xfrm_trans_tasklet *trans = (void *)data;
487         struct sk_buff_head queue;
488         struct sk_buff *skb;
489 
490         __skb_queue_head_init(&queue);
491         skb_queue_splice_init(&trans->queue, &queue);
492 
493         while ((skb = __skb_dequeue(&queue)))
494                 XFRM_TRANS_SKB_CB(skb)->finish(dev_net(skb->dev), NULL, skb);
495 }
496 
497 int xfrm_trans_queue(struct sk_buff *skb,
498                      int (*finish)(struct net *, struct sock *,
499                                    struct sk_buff *))
500 {
501         struct xfrm_trans_tasklet *trans;
502 
503         trans = this_cpu_ptr(&xfrm_trans_tasklet);
504 
505         if (skb_queue_len(&trans->queue) >= netdev_max_backlog)
506                 return -ENOBUFS;
507 
508         XFRM_TRANS_SKB_CB(skb)->finish = finish;
509         __skb_queue_tail(&trans->queue, skb);
510         tasklet_schedule(&trans->tasklet);
511         return 0;
512 }
513 EXPORT_SYMBOL(xfrm_trans_queue);
514 
515 void __init xfrm_input_init(void)
516 {
517         int err;
518         int i;
519 
520         init_dummy_netdev(&xfrm_napi_dev);
521         err = gro_cells_init(&gro_cells, &xfrm_napi_dev);
522         if (err)
523                 gro_cells.cells = NULL;
524 
525         for_each_possible_cpu(i) {
526                 struct xfrm_trans_tasklet *trans;
527 
528                 trans = &per_cpu(xfrm_trans_tasklet, i);
529                 __skb_queue_head_init(&trans->queue);
530                 tasklet_init(&trans->tasklet, xfrm_trans_reinject,
531                              (unsigned long)trans);
532         }
533 }
534 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp