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

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  1 /*
  2  *      Linux NET3: IP/IP protocol decoder modified to support
  3  *                  virtual tunnel interface
  4  *
  5  *      Authors:
  6  *              Saurabh Mohan (saurabh.mohan@vyatta.com) 05/07/2012
  7  *
  8  *      This program is free software; you can redistribute it and/or
  9  *      modify it under the terms of the GNU General Public License
 10  *      as published by the Free Software Foundation; either version
 11  *      2 of the License, or (at your option) any later version.
 12  *
 13  */
 14 
 15 /*
 16    This version of net/ipv4/ip_vti.c is cloned of net/ipv4/ipip.c
 17 
 18    For comments look at net/ipv4/ip_gre.c --ANK
 19  */
 20 
 21 
 22 #include <linux/capability.h>
 23 #include <linux/module.h>
 24 #include <linux/types.h>
 25 #include <linux/kernel.h>
 26 #include <linux/uaccess.h>
 27 #include <linux/skbuff.h>
 28 #include <linux/netdevice.h>
 29 #include <linux/in.h>
 30 #include <linux/tcp.h>
 31 #include <linux/udp.h>
 32 #include <linux/if_arp.h>
 33 #include <linux/init.h>
 34 #include <linux/netfilter_ipv4.h>
 35 #include <linux/if_ether.h>
 36 #include <linux/icmpv6.h>
 37 
 38 #include <net/sock.h>
 39 #include <net/ip.h>
 40 #include <net/icmp.h>
 41 #include <net/ip_tunnels.h>
 42 #include <net/inet_ecn.h>
 43 #include <net/xfrm.h>
 44 #include <net/net_namespace.h>
 45 #include <net/netns/generic.h>
 46 
 47 static struct rtnl_link_ops vti_link_ops __read_mostly;
 48 
 49 static unsigned int vti_net_id __read_mostly;
 50 static int vti_tunnel_init(struct net_device *dev);
 51 
 52 static int vti_input(struct sk_buff *skb, int nexthdr, __be32 spi,
 53                      int encap_type)
 54 {
 55         struct ip_tunnel *tunnel;
 56         const struct iphdr *iph = ip_hdr(skb);
 57         struct net *net = dev_net(skb->dev);
 58         struct ip_tunnel_net *itn = net_generic(net, vti_net_id);
 59 
 60         tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, TUNNEL_NO_KEY,
 61                                   iph->saddr, iph->daddr, 0);
 62         if (tunnel) {
 63                 if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb))
 64                         goto drop;
 65 
 66                 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = tunnel;
 67 
 68                 return xfrm_input(skb, nexthdr, spi, encap_type);
 69         }
 70 
 71         return -EINVAL;
 72 drop:
 73         kfree_skb(skb);
 74         return 0;
 75 }
 76 
 77 static int vti_rcv(struct sk_buff *skb)
 78 {
 79         XFRM_SPI_SKB_CB(skb)->family = AF_INET;
 80         XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
 81 
 82         return vti_input(skb, ip_hdr(skb)->protocol, 0, 0);
 83 }
 84 
 85 static int vti_rcv_cb(struct sk_buff *skb, int err)
 86 {
 87         unsigned short family;
 88         struct net_device *dev;
 89         struct pcpu_sw_netstats *tstats;
 90         struct xfrm_state *x;
 91         struct xfrm_mode *inner_mode;
 92         struct ip_tunnel *tunnel = XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4;
 93         u32 orig_mark = skb->mark;
 94         int ret;
 95 
 96         if (!tunnel)
 97                 return 1;
 98 
 99         dev = tunnel->dev;
100 
101         if (err) {
102                 dev->stats.rx_errors++;
103                 dev->stats.rx_dropped++;
104 
105                 return 0;
106         }
107 
108         x = xfrm_input_state(skb);
109 
110         inner_mode = x->inner_mode;
111 
112         if (x->sel.family == AF_UNSPEC) {
113                 inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol);
114                 if (inner_mode == NULL) {
115                         XFRM_INC_STATS(dev_net(skb->dev),
116                                        LINUX_MIB_XFRMINSTATEMODEERROR);
117                         return -EINVAL;
118                 }
119         }
120 
121         family = inner_mode->afinfo->family;
122 
123         skb->mark = be32_to_cpu(tunnel->parms.i_key);
124         ret = xfrm_policy_check(NULL, XFRM_POLICY_IN, skb, family);
125         skb->mark = orig_mark;
126 
127         if (!ret)
128                 return -EPERM;
129 
130         skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(skb->dev)));
131         skb->dev = dev;
132 
133         tstats = this_cpu_ptr(dev->tstats);
134 
135         u64_stats_update_begin(&tstats->syncp);
136         tstats->rx_packets++;
137         tstats->rx_bytes += skb->len;
138         u64_stats_update_end(&tstats->syncp);
139 
140         return 0;
141 }
142 
143 static bool vti_state_check(const struct xfrm_state *x, __be32 dst, __be32 src)
144 {
145         xfrm_address_t *daddr = (xfrm_address_t *)&dst;
146         xfrm_address_t *saddr = (xfrm_address_t *)&src;
147 
148         /* if there is no transform then this tunnel is not functional.
149          * Or if the xfrm is not mode tunnel.
150          */
151         if (!x || x->props.mode != XFRM_MODE_TUNNEL ||
152             x->props.family != AF_INET)
153                 return false;
154 
155         if (!dst)
156                 return xfrm_addr_equal(saddr, &x->props.saddr, AF_INET);
157 
158         if (!xfrm_state_addr_check(x, daddr, saddr, AF_INET))
159                 return false;
160 
161         return true;
162 }
163 
164 static netdev_tx_t vti_xmit(struct sk_buff *skb, struct net_device *dev,
165                             struct flowi *fl)
166 {
167         struct ip_tunnel *tunnel = netdev_priv(dev);
168         struct ip_tunnel_parm *parms = &tunnel->parms;
169         struct dst_entry *dst = skb_dst(skb);
170         struct net_device *tdev;        /* Device to other host */
171         int pkt_len = skb->len;
172         int err;
173         int mtu;
174 
175         if (!dst) {
176                 dev->stats.tx_carrier_errors++;
177                 goto tx_error_icmp;
178         }
179 
180         dst_hold(dst);
181         dst = xfrm_lookup(tunnel->net, dst, fl, NULL, 0);
182         if (IS_ERR(dst)) {
183                 dev->stats.tx_carrier_errors++;
184                 goto tx_error_icmp;
185         }
186 
187         if (!vti_state_check(dst->xfrm, parms->iph.daddr, parms->iph.saddr)) {
188                 dev->stats.tx_carrier_errors++;
189                 dst_release(dst);
190                 goto tx_error_icmp;
191         }
192 
193         tdev = dst->dev;
194 
195         if (tdev == dev) {
196                 dst_release(dst);
197                 dev->stats.collisions++;
198                 goto tx_error;
199         }
200 
201         mtu = dst_mtu(dst);
202         if (skb->len > mtu) {
203                 skb_dst_update_pmtu(skb, mtu);
204                 if (skb->protocol == htons(ETH_P_IP)) {
205                         icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
206                                   htonl(mtu));
207                 } else {
208                         if (mtu < IPV6_MIN_MTU)
209                                 mtu = IPV6_MIN_MTU;
210 
211                         icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
212                 }
213 
214                 dst_release(dst);
215                 goto tx_error;
216         }
217 
218         skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(dev)));
219         skb_dst_set(skb, dst);
220         skb->dev = skb_dst(skb)->dev;
221 
222         err = dst_output(tunnel->net, skb->sk, skb);
223         if (net_xmit_eval(err) == 0)
224                 err = pkt_len;
225         iptunnel_xmit_stats(dev, err);
226         return NETDEV_TX_OK;
227 
228 tx_error_icmp:
229         dst_link_failure(skb);
230 tx_error:
231         dev->stats.tx_errors++;
232         kfree_skb(skb);
233         return NETDEV_TX_OK;
234 }
235 
236 /* This function assumes it is being called from dev_queue_xmit()
237  * and that skb is filled properly by that function.
238  */
239 static netdev_tx_t vti_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
240 {
241         struct ip_tunnel *tunnel = netdev_priv(dev);
242         struct flowi fl;
243 
244         memset(&fl, 0, sizeof(fl));
245 
246         switch (skb->protocol) {
247         case htons(ETH_P_IP):
248                 xfrm_decode_session(skb, &fl, AF_INET);
249                 memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
250                 break;
251         case htons(ETH_P_IPV6):
252                 xfrm_decode_session(skb, &fl, AF_INET6);
253                 memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));
254                 break;
255         default:
256                 dev->stats.tx_errors++;
257                 dev_kfree_skb(skb);
258                 return NETDEV_TX_OK;
259         }
260 
261         /* override mark with tunnel output key */
262         fl.flowi_mark = be32_to_cpu(tunnel->parms.o_key);
263 
264         return vti_xmit(skb, dev, &fl);
265 }
266 
267 static int vti4_err(struct sk_buff *skb, u32 info)
268 {
269         __be32 spi;
270         __u32 mark;
271         struct xfrm_state *x;
272         struct ip_tunnel *tunnel;
273         struct ip_esp_hdr *esph;
274         struct ip_auth_hdr *ah ;
275         struct ip_comp_hdr *ipch;
276         struct net *net = dev_net(skb->dev);
277         const struct iphdr *iph = (const struct iphdr *)skb->data;
278         int protocol = iph->protocol;
279         struct ip_tunnel_net *itn = net_generic(net, vti_net_id);
280 
281         tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, TUNNEL_NO_KEY,
282                                   iph->daddr, iph->saddr, 0);
283         if (!tunnel)
284                 return -1;
285 
286         mark = be32_to_cpu(tunnel->parms.o_key);
287 
288         switch (protocol) {
289         case IPPROTO_ESP:
290                 esph = (struct ip_esp_hdr *)(skb->data+(iph->ihl<<2));
291                 spi = esph->spi;
292                 break;
293         case IPPROTO_AH:
294                 ah = (struct ip_auth_hdr *)(skb->data+(iph->ihl<<2));
295                 spi = ah->spi;
296                 break;
297         case IPPROTO_COMP:
298                 ipch = (struct ip_comp_hdr *)(skb->data+(iph->ihl<<2));
299                 spi = htonl(ntohs(ipch->cpi));
300                 break;
301         default:
302                 return 0;
303         }
304 
305         switch (icmp_hdr(skb)->type) {
306         case ICMP_DEST_UNREACH:
307                 if (icmp_hdr(skb)->code != ICMP_FRAG_NEEDED)
308                         return 0;
309         case ICMP_REDIRECT:
310                 break;
311         default:
312                 return 0;
313         }
314 
315         x = xfrm_state_lookup(net, mark, (const xfrm_address_t *)&iph->daddr,
316                               spi, protocol, AF_INET);
317         if (!x)
318                 return 0;
319 
320         if (icmp_hdr(skb)->type == ICMP_DEST_UNREACH)
321                 ipv4_update_pmtu(skb, net, info, 0, 0, protocol, 0);
322         else
323                 ipv4_redirect(skb, net, 0, 0, protocol, 0);
324         xfrm_state_put(x);
325 
326         return 0;
327 }
328 
329 static int
330 vti_tunnel_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
331 {
332         int err = 0;
333         struct ip_tunnel_parm p;
334 
335         if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
336                 return -EFAULT;
337 
338         if (cmd == SIOCADDTUNNEL || cmd == SIOCCHGTUNNEL) {
339                 if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPIP ||
340                     p.iph.ihl != 5)
341                         return -EINVAL;
342         }
343 
344         if (!(p.i_flags & GRE_KEY))
345                 p.i_key = 0;
346         if (!(p.o_flags & GRE_KEY))
347                 p.o_key = 0;
348 
349         p.i_flags = VTI_ISVTI;
350 
351         err = ip_tunnel_ioctl(dev, &p, cmd);
352         if (err)
353                 return err;
354 
355         if (cmd != SIOCDELTUNNEL) {
356                 p.i_flags |= GRE_KEY;
357                 p.o_flags |= GRE_KEY;
358         }
359 
360         if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
361                 return -EFAULT;
362         return 0;
363 }
364 
365 static const struct net_device_ops vti_netdev_ops = {
366         .ndo_init       = vti_tunnel_init,
367         .ndo_uninit     = ip_tunnel_uninit,
368         .ndo_start_xmit = vti_tunnel_xmit,
369         .ndo_do_ioctl   = vti_tunnel_ioctl,
370         .ndo_change_mtu = ip_tunnel_change_mtu,
371         .ndo_get_stats64 = ip_tunnel_get_stats64,
372         .ndo_get_iflink = ip_tunnel_get_iflink,
373 };
374 
375 static void vti_tunnel_setup(struct net_device *dev)
376 {
377         dev->netdev_ops         = &vti_netdev_ops;
378         dev->type               = ARPHRD_TUNNEL;
379         ip_tunnel_setup(dev, vti_net_id);
380 }
381 
382 static int vti_tunnel_init(struct net_device *dev)
383 {
384         struct ip_tunnel *tunnel = netdev_priv(dev);
385         struct iphdr *iph = &tunnel->parms.iph;
386 
387         memcpy(dev->dev_addr, &iph->saddr, 4);
388         memcpy(dev->broadcast, &iph->daddr, 4);
389 
390         dev->hard_header_len    = LL_MAX_HEADER + sizeof(struct iphdr);
391         dev->mtu                = ETH_DATA_LEN;
392         dev->flags              = IFF_NOARP;
393         dev->addr_len           = 4;
394         dev->features           |= NETIF_F_LLTX;
395         netif_keep_dst(dev);
396 
397         return ip_tunnel_init(dev);
398 }
399 
400 static void __net_init vti_fb_tunnel_init(struct net_device *dev)
401 {
402         struct ip_tunnel *tunnel = netdev_priv(dev);
403         struct iphdr *iph = &tunnel->parms.iph;
404 
405         iph->version            = 4;
406         iph->protocol           = IPPROTO_IPIP;
407         iph->ihl                = 5;
408 }
409 
410 static struct xfrm4_protocol vti_esp4_protocol __read_mostly = {
411         .handler        =       vti_rcv,
412         .input_handler  =       vti_input,
413         .cb_handler     =       vti_rcv_cb,
414         .err_handler    =       vti4_err,
415         .priority       =       100,
416 };
417 
418 static struct xfrm4_protocol vti_ah4_protocol __read_mostly = {
419         .handler        =       vti_rcv,
420         .input_handler  =       vti_input,
421         .cb_handler     =       vti_rcv_cb,
422         .err_handler    =       vti4_err,
423         .priority       =       100,
424 };
425 
426 static struct xfrm4_protocol vti_ipcomp4_protocol __read_mostly = {
427         .handler        =       vti_rcv,
428         .input_handler  =       vti_input,
429         .cb_handler     =       vti_rcv_cb,
430         .err_handler    =       vti4_err,
431         .priority       =       100,
432 };
433 
434 static int __net_init vti_init_net(struct net *net)
435 {
436         int err;
437         struct ip_tunnel_net *itn;
438 
439         err = ip_tunnel_init_net(net, vti_net_id, &vti_link_ops, "ip_vti0");
440         if (err)
441                 return err;
442         itn = net_generic(net, vti_net_id);
443         vti_fb_tunnel_init(itn->fb_tunnel_dev);
444         return 0;
445 }
446 
447 static void __net_exit vti_exit_batch_net(struct list_head *list_net)
448 {
449         ip_tunnel_delete_nets(list_net, vti_net_id, &vti_link_ops);
450 }
451 
452 static struct pernet_operations vti_net_ops = {
453         .init = vti_init_net,
454         .exit_batch = vti_exit_batch_net,
455         .id   = &vti_net_id,
456         .size = sizeof(struct ip_tunnel_net),
457 };
458 
459 static int vti_tunnel_validate(struct nlattr *tb[], struct nlattr *data[],
460                                struct netlink_ext_ack *extack)
461 {
462         return 0;
463 }
464 
465 static void vti_netlink_parms(struct nlattr *data[],
466                               struct ip_tunnel_parm *parms,
467                               __u32 *fwmark)
468 {
469         memset(parms, 0, sizeof(*parms));
470 
471         parms->iph.protocol = IPPROTO_IPIP;
472 
473         if (!data)
474                 return;
475 
476         parms->i_flags = VTI_ISVTI;
477 
478         if (data[IFLA_VTI_LINK])
479                 parms->link = nla_get_u32(data[IFLA_VTI_LINK]);
480 
481         if (data[IFLA_VTI_IKEY])
482                 parms->i_key = nla_get_be32(data[IFLA_VTI_IKEY]);
483 
484         if (data[IFLA_VTI_OKEY])
485                 parms->o_key = nla_get_be32(data[IFLA_VTI_OKEY]);
486 
487         if (data[IFLA_VTI_LOCAL])
488                 parms->iph.saddr = nla_get_in_addr(data[IFLA_VTI_LOCAL]);
489 
490         if (data[IFLA_VTI_REMOTE])
491                 parms->iph.daddr = nla_get_in_addr(data[IFLA_VTI_REMOTE]);
492 
493         if (data[IFLA_VTI_FWMARK])
494                 *fwmark = nla_get_u32(data[IFLA_VTI_FWMARK]);
495 }
496 
497 static int vti_newlink(struct net *src_net, struct net_device *dev,
498                        struct nlattr *tb[], struct nlattr *data[],
499                        struct netlink_ext_ack *extack)
500 {
501         struct ip_tunnel_parm parms;
502         __u32 fwmark = 0;
503 
504         vti_netlink_parms(data, &parms, &fwmark);
505         return ip_tunnel_newlink(dev, tb, &parms, fwmark);
506 }
507 
508 static int vti_changelink(struct net_device *dev, struct nlattr *tb[],
509                           struct nlattr *data[],
510                           struct netlink_ext_ack *extack)
511 {
512         struct ip_tunnel *t = netdev_priv(dev);
513         __u32 fwmark = t->fwmark;
514         struct ip_tunnel_parm p;
515 
516         vti_netlink_parms(data, &p, &fwmark);
517         return ip_tunnel_changelink(dev, tb, &p, fwmark);
518 }
519 
520 static size_t vti_get_size(const struct net_device *dev)
521 {
522         return
523                 /* IFLA_VTI_LINK */
524                 nla_total_size(4) +
525                 /* IFLA_VTI_IKEY */
526                 nla_total_size(4) +
527                 /* IFLA_VTI_OKEY */
528                 nla_total_size(4) +
529                 /* IFLA_VTI_LOCAL */
530                 nla_total_size(4) +
531                 /* IFLA_VTI_REMOTE */
532                 nla_total_size(4) +
533                 /* IFLA_VTI_FWMARK */
534                 nla_total_size(4) +
535                 0;
536 }
537 
538 static int vti_fill_info(struct sk_buff *skb, const struct net_device *dev)
539 {
540         struct ip_tunnel *t = netdev_priv(dev);
541         struct ip_tunnel_parm *p = &t->parms;
542 
543         if (nla_put_u32(skb, IFLA_VTI_LINK, p->link) ||
544             nla_put_be32(skb, IFLA_VTI_IKEY, p->i_key) ||
545             nla_put_be32(skb, IFLA_VTI_OKEY, p->o_key) ||
546             nla_put_in_addr(skb, IFLA_VTI_LOCAL, p->iph.saddr) ||
547             nla_put_in_addr(skb, IFLA_VTI_REMOTE, p->iph.daddr) ||
548             nla_put_u32(skb, IFLA_VTI_FWMARK, t->fwmark))
549                 return -EMSGSIZE;
550 
551         return 0;
552 }
553 
554 static const struct nla_policy vti_policy[IFLA_VTI_MAX + 1] = {
555         [IFLA_VTI_LINK]         = { .type = NLA_U32 },
556         [IFLA_VTI_IKEY]         = { .type = NLA_U32 },
557         [IFLA_VTI_OKEY]         = { .type = NLA_U32 },
558         [IFLA_VTI_LOCAL]        = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
559         [IFLA_VTI_REMOTE]       = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
560         [IFLA_VTI_FWMARK]       = { .type = NLA_U32 },
561 };
562 
563 static struct rtnl_link_ops vti_link_ops __read_mostly = {
564         .kind           = "vti",
565         .maxtype        = IFLA_VTI_MAX,
566         .policy         = vti_policy,
567         .priv_size      = sizeof(struct ip_tunnel),
568         .setup          = vti_tunnel_setup,
569         .validate       = vti_tunnel_validate,
570         .newlink        = vti_newlink,
571         .changelink     = vti_changelink,
572         .dellink        = ip_tunnel_dellink,
573         .get_size       = vti_get_size,
574         .fill_info      = vti_fill_info,
575         .get_link_net   = ip_tunnel_get_link_net,
576 };
577 
578 static int __init vti_init(void)
579 {
580         const char *msg;
581         int err;
582 
583         pr_info("IPv4 over IPsec tunneling driver\n");
584 
585         msg = "tunnel device";
586         err = register_pernet_device(&vti_net_ops);
587         if (err < 0)
588                 goto pernet_dev_failed;
589 
590         msg = "tunnel protocols";
591         err = xfrm4_protocol_register(&vti_esp4_protocol, IPPROTO_ESP);
592         if (err < 0)
593                 goto xfrm_proto_esp_failed;
594         err = xfrm4_protocol_register(&vti_ah4_protocol, IPPROTO_AH);
595         if (err < 0)
596                 goto xfrm_proto_ah_failed;
597         err = xfrm4_protocol_register(&vti_ipcomp4_protocol, IPPROTO_COMP);
598         if (err < 0)
599                 goto xfrm_proto_comp_failed;
600 
601         msg = "netlink interface";
602         err = rtnl_link_register(&vti_link_ops);
603         if (err < 0)
604                 goto rtnl_link_failed;
605 
606         return err;
607 
608 rtnl_link_failed:
609         xfrm4_protocol_deregister(&vti_ipcomp4_protocol, IPPROTO_COMP);
610 xfrm_proto_comp_failed:
611         xfrm4_protocol_deregister(&vti_ah4_protocol, IPPROTO_AH);
612 xfrm_proto_ah_failed:
613         xfrm4_protocol_deregister(&vti_esp4_protocol, IPPROTO_ESP);
614 xfrm_proto_esp_failed:
615         unregister_pernet_device(&vti_net_ops);
616 pernet_dev_failed:
617         pr_err("vti init: failed to register %s\n", msg);
618         return err;
619 }
620 
621 static void __exit vti_fini(void)
622 {
623         rtnl_link_unregister(&vti_link_ops);
624         xfrm4_protocol_deregister(&vti_ipcomp4_protocol, IPPROTO_COMP);
625         xfrm4_protocol_deregister(&vti_ah4_protocol, IPPROTO_AH);
626         xfrm4_protocol_deregister(&vti_esp4_protocol, IPPROTO_ESP);
627         unregister_pernet_device(&vti_net_ops);
628 }
629 
630 module_init(vti_init);
631 module_exit(vti_fini);
632 MODULE_LICENSE("GPL");
633 MODULE_ALIAS_RTNL_LINK("vti");
634 MODULE_ALIAS_NETDEV("ip_vti0");
635 

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