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60#include <linux/string.h>
61#include <linux/module.h>
62#include <linux/kernel.h>
63#include <linux/slab.h>
64#include <linux/errno.h>
65#include <linux/netdevice.h>
66#include <linux/net.h>
67#include <linux/inetdevice.h>
68#include <linux/etherdevice.h>
69#include <linux/skbuff.h>
70#include <linux/init.h>
71#include <linux/if_ether.h>
72#include <linux/if_pppox.h>
73#include <linux/ppp_channel.h>
74#include <linux/ppp_defs.h>
75#include <linux/ppp-ioctl.h>
76#include <linux/notifier.h>
77#include <linux/file.h>
78#include <linux/proc_fs.h>
79#include <linux/seq_file.h>
80
81#include <linux/nsproxy.h>
82#include <net/net_namespace.h>
83#include <net/netns/generic.h>
84#include <net/sock.h>
85
86#include <asm/uaccess.h>
87
88#define PPPOE_HASH_BITS 4
89#define PPPOE_HASH_SIZE (1 << PPPOE_HASH_BITS)
90#define PPPOE_HASH_MASK (PPPOE_HASH_SIZE - 1)
91
92static int __pppoe_xmit(struct sock *sk, struct sk_buff *skb);
93
94static const struct proto_ops pppoe_ops;
95static const struct ppp_channel_ops pppoe_chan_ops;
96
97
98static int pppoe_net_id __read_mostly;
99struct pppoe_net {
100
101
102
103
104
105
106
107
108 struct pppox_sock *hash_table[PPPOE_HASH_SIZE];
109 rwlock_t hash_lock;
110};
111
112
113
114
115
116
117
118
119
120static inline bool stage_session(__be16 sid)
121{
122 return sid != 0;
123}
124
125static inline struct pppoe_net *pppoe_pernet(struct net *net)
126{
127 BUG_ON(!net);
128
129 return net_generic(net, pppoe_net_id);
130}
131
132static inline int cmp_2_addr(struct pppoe_addr *a, struct pppoe_addr *b)
133{
134 return a->sid == b->sid && ether_addr_equal(a->remote, b->remote);
135}
136
137static inline int cmp_addr(struct pppoe_addr *a, __be16 sid, char *addr)
138{
139 return a->sid == sid && ether_addr_equal(a->remote, addr);
140}
141
142#if 8 % PPPOE_HASH_BITS
143#error 8 must be a multiple of PPPOE_HASH_BITS
144#endif
145
146static int hash_item(__be16 sid, unsigned char *addr)
147{
148 unsigned char hash = 0;
149 unsigned int i;
150
151 for (i = 0; i < ETH_ALEN; i++)
152 hash ^= addr[i];
153 for (i = 0; i < sizeof(sid_t) * 8; i += 8)
154 hash ^= (__force __u32)sid >> i;
155 for (i = 8; (i >>= 1) >= PPPOE_HASH_BITS;)
156 hash ^= hash >> i;
157
158 return hash & PPPOE_HASH_MASK;
159}
160
161
162
163
164
165
166static struct pppox_sock *__get_item(struct pppoe_net *pn, __be16 sid,
167 unsigned char *addr, int ifindex)
168{
169 int hash = hash_item(sid, addr);
170 struct pppox_sock *ret;
171
172 ret = pn->hash_table[hash];
173 while (ret) {
174 if (cmp_addr(&ret->pppoe_pa, sid, addr) &&
175 ret->pppoe_ifindex == ifindex)
176 return ret;
177
178 ret = ret->next;
179 }
180
181 return NULL;
182}
183
184static int __set_item(struct pppoe_net *pn, struct pppox_sock *po)
185{
186 int hash = hash_item(po->pppoe_pa.sid, po->pppoe_pa.remote);
187 struct pppox_sock *ret;
188
189 ret = pn->hash_table[hash];
190 while (ret) {
191 if (cmp_2_addr(&ret->pppoe_pa, &po->pppoe_pa) &&
192 ret->pppoe_ifindex == po->pppoe_ifindex)
193 return -EALREADY;
194
195 ret = ret->next;
196 }
197
198 po->next = pn->hash_table[hash];
199 pn->hash_table[hash] = po;
200
201 return 0;
202}
203
204static void __delete_item(struct pppoe_net *pn, __be16 sid,
205 char *addr, int ifindex)
206{
207 int hash = hash_item(sid, addr);
208 struct pppox_sock *ret, **src;
209
210 ret = pn->hash_table[hash];
211 src = &pn->hash_table[hash];
212
213 while (ret) {
214 if (cmp_addr(&ret->pppoe_pa, sid, addr) &&
215 ret->pppoe_ifindex == ifindex) {
216 *src = ret->next;
217 break;
218 }
219
220 src = &ret->next;
221 ret = ret->next;
222 }
223}
224
225
226
227
228
229
230static inline struct pppox_sock *get_item(struct pppoe_net *pn, __be16 sid,
231 unsigned char *addr, int ifindex)
232{
233 struct pppox_sock *po;
234
235 read_lock_bh(&pn->hash_lock);
236 po = __get_item(pn, sid, addr, ifindex);
237 if (po)
238 sock_hold(sk_pppox(po));
239 read_unlock_bh(&pn->hash_lock);
240
241 return po;
242}
243
244static inline struct pppox_sock *get_item_by_addr(struct net *net,
245 struct sockaddr_pppox *sp)
246{
247 struct net_device *dev;
248 struct pppoe_net *pn;
249 struct pppox_sock *pppox_sock = NULL;
250
251 int ifindex;
252
253 rcu_read_lock();
254 dev = dev_get_by_name_rcu(net, sp->sa_addr.pppoe.dev);
255 if (dev) {
256 ifindex = dev->ifindex;
257 pn = pppoe_pernet(net);
258 pppox_sock = get_item(pn, sp->sa_addr.pppoe.sid,
259 sp->sa_addr.pppoe.remote, ifindex);
260 }
261 rcu_read_unlock();
262 return pppox_sock;
263}
264
265static inline void delete_item(struct pppoe_net *pn, __be16 sid,
266 char *addr, int ifindex)
267{
268 write_lock_bh(&pn->hash_lock);
269 __delete_item(pn, sid, addr, ifindex);
270 write_unlock_bh(&pn->hash_lock);
271}
272
273
274
275
276
277
278
279
280static void pppoe_flush_dev(struct net_device *dev)
281{
282 struct pppoe_net *pn;
283 int i;
284
285 pn = pppoe_pernet(dev_net(dev));
286 write_lock_bh(&pn->hash_lock);
287 for (i = 0; i < PPPOE_HASH_SIZE; i++) {
288 struct pppox_sock *po = pn->hash_table[i];
289 struct sock *sk;
290
291 while (po) {
292 while (po && po->pppoe_dev != dev) {
293 po = po->next;
294 }
295
296 if (!po)
297 break;
298
299 sk = sk_pppox(po);
300
301
302
303
304
305
306
307
308
309 sock_hold(sk);
310 write_unlock_bh(&pn->hash_lock);
311 lock_sock(sk);
312
313 if (po->pppoe_dev == dev &&
314 sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND | PPPOX_ZOMBIE)) {
315 pppox_unbind_sock(sk);
316 sk->sk_state = PPPOX_ZOMBIE;
317 sk->sk_state_change(sk);
318 po->pppoe_dev = NULL;
319 dev_put(dev);
320 }
321
322 release_sock(sk);
323 sock_put(sk);
324
325
326
327
328
329
330 BUG_ON(pppoe_pernet(dev_net(dev)) == NULL);
331 write_lock_bh(&pn->hash_lock);
332 po = pn->hash_table[i];
333 }
334 }
335 write_unlock_bh(&pn->hash_lock);
336}
337
338static int pppoe_device_event(struct notifier_block *this,
339 unsigned long event, void *ptr)
340{
341 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
342
343
344 switch (event) {
345 case NETDEV_CHANGEADDR:
346 case NETDEV_CHANGEMTU:
347
348
349
350
351 case NETDEV_GOING_DOWN:
352 case NETDEV_DOWN:
353
354 pppoe_flush_dev(dev);
355 break;
356
357 default:
358 break;
359 }
360
361 return NOTIFY_DONE;
362}
363
364static struct notifier_block pppoe_notifier = {
365 .notifier_call = pppoe_device_event,
366};
367
368
369
370
371
372
373static int pppoe_rcv_core(struct sock *sk, struct sk_buff *skb)
374{
375 struct pppox_sock *po = pppox_sk(sk);
376 struct pppox_sock *relay_po;
377
378
379
380
381
382
383 if (skb->pkt_type == PACKET_OTHERHOST)
384 goto abort_kfree;
385
386 if (sk->sk_state & PPPOX_BOUND) {
387 ppp_input(&po->chan, skb);
388 } else if (sk->sk_state & PPPOX_RELAY) {
389 relay_po = get_item_by_addr(sock_net(sk),
390 &po->pppoe_relay);
391 if (relay_po == NULL)
392 goto abort_kfree;
393
394 if ((sk_pppox(relay_po)->sk_state & PPPOX_CONNECTED) == 0)
395 goto abort_put;
396
397 if (!__pppoe_xmit(sk_pppox(relay_po), skb))
398 goto abort_put;
399 } else {
400 if (sock_queue_rcv_skb(sk, skb))
401 goto abort_kfree;
402 }
403
404 return NET_RX_SUCCESS;
405
406abort_put:
407 sock_put(sk_pppox(relay_po));
408
409abort_kfree:
410 kfree_skb(skb);
411 return NET_RX_DROP;
412}
413
414
415
416
417
418
419static int pppoe_rcv(struct sk_buff *skb, struct net_device *dev,
420 struct packet_type *pt, struct net_device *orig_dev)
421{
422 struct pppoe_hdr *ph;
423 struct pppox_sock *po;
424 struct pppoe_net *pn;
425 int len;
426
427 skb = skb_share_check(skb, GFP_ATOMIC);
428 if (!skb)
429 goto out;
430
431 if (!pskb_may_pull(skb, sizeof(struct pppoe_hdr)))
432 goto drop;
433
434 ph = pppoe_hdr(skb);
435 len = ntohs(ph->length);
436
437 skb_pull_rcsum(skb, sizeof(*ph));
438 if (skb->len < len)
439 goto drop;
440
441 if (pskb_trim_rcsum(skb, len))
442 goto drop;
443
444 pn = pppoe_pernet(dev_net(dev));
445
446
447
448
449 po = get_item(pn, ph->sid, eth_hdr(skb)->h_source, dev->ifindex);
450 if (!po)
451 goto drop;
452
453 return sk_receive_skb(sk_pppox(po), skb, 0);
454
455drop:
456 kfree_skb(skb);
457out:
458 return NET_RX_DROP;
459}
460
461static void pppoe_unbind_sock_work(struct work_struct *work)
462{
463 struct pppox_sock *po = container_of(work, struct pppox_sock,
464 proto.pppoe.padt_work);
465 struct sock *sk = sk_pppox(po);
466
467 lock_sock(sk);
468 if (po->pppoe_dev) {
469 dev_put(po->pppoe_dev);
470 po->pppoe_dev = NULL;
471 }
472 pppox_unbind_sock(sk);
473 release_sock(sk);
474 sock_put(sk);
475}
476
477
478
479
480
481
482
483static int pppoe_disc_rcv(struct sk_buff *skb, struct net_device *dev,
484 struct packet_type *pt, struct net_device *orig_dev)
485
486{
487 struct pppoe_hdr *ph;
488 struct pppox_sock *po;
489 struct pppoe_net *pn;
490
491 skb = skb_share_check(skb, GFP_ATOMIC);
492 if (!skb)
493 goto out;
494
495 if (!pskb_may_pull(skb, sizeof(struct pppoe_hdr)))
496 goto abort;
497
498 ph = pppoe_hdr(skb);
499 if (ph->code != PADT_CODE)
500 goto abort;
501
502 pn = pppoe_pernet(dev_net(dev));
503 po = get_item(pn, ph->sid, eth_hdr(skb)->h_source, dev->ifindex);
504 if (po) {
505 struct sock *sk = sk_pppox(po);
506
507 bh_lock_sock(sk);
508
509
510
511
512
513
514 if (sock_owned_by_user(sk) == 0) {
515
516
517
518 sk->sk_state = PPPOX_ZOMBIE;
519 }
520
521 bh_unlock_sock(sk);
522 if (!schedule_work(&po->proto.pppoe.padt_work))
523 sock_put(sk);
524 }
525
526abort:
527 kfree_skb(skb);
528out:
529 return NET_RX_SUCCESS;
530}
531
532static struct packet_type pppoes_ptype __read_mostly = {
533 .type = cpu_to_be16(ETH_P_PPP_SES),
534 .func = pppoe_rcv,
535};
536
537static struct packet_type pppoed_ptype __read_mostly = {
538 .type = cpu_to_be16(ETH_P_PPP_DISC),
539 .func = pppoe_disc_rcv,
540};
541
542static struct proto pppoe_sk_proto __read_mostly = {
543 .name = "PPPOE",
544 .owner = THIS_MODULE,
545 .obj_size = sizeof(struct pppox_sock),
546};
547
548
549
550
551
552
553static int pppoe_create(struct net *net, struct socket *sock)
554{
555 struct sock *sk;
556
557 sk = sk_alloc(net, PF_PPPOX, GFP_KERNEL, &pppoe_sk_proto);
558 if (!sk)
559 return -ENOMEM;
560
561 sock_init_data(sock, sk);
562
563 sock->state = SS_UNCONNECTED;
564 sock->ops = &pppoe_ops;
565
566 sk->sk_backlog_rcv = pppoe_rcv_core;
567 sk->sk_state = PPPOX_NONE;
568 sk->sk_type = SOCK_STREAM;
569 sk->sk_family = PF_PPPOX;
570 sk->sk_protocol = PX_PROTO_OE;
571
572 return 0;
573}
574
575static int pppoe_release(struct socket *sock)
576{
577 struct sock *sk = sock->sk;
578 struct pppox_sock *po;
579 struct pppoe_net *pn;
580 struct net *net = NULL;
581
582 if (!sk)
583 return 0;
584
585 lock_sock(sk);
586 if (sock_flag(sk, SOCK_DEAD)) {
587 release_sock(sk);
588 return -EBADF;
589 }
590
591 po = pppox_sk(sk);
592
593 if (sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND | PPPOX_ZOMBIE)) {
594 dev_put(po->pppoe_dev);
595 po->pppoe_dev = NULL;
596 }
597
598 pppox_unbind_sock(sk);
599
600
601 sk->sk_state = PPPOX_DEAD;
602
603 net = sock_net(sk);
604 pn = pppoe_pernet(net);
605
606
607
608
609
610 delete_item(pn, po->pppoe_pa.sid, po->pppoe_pa.remote,
611 po->pppoe_ifindex);
612
613 sock_orphan(sk);
614 sock->sk = NULL;
615
616 skb_queue_purge(&sk->sk_receive_queue);
617 release_sock(sk);
618 sock_put(sk);
619
620 return 0;
621}
622
623static int pppoe_connect(struct socket *sock, struct sockaddr *uservaddr,
624 int sockaddr_len, int flags)
625{
626 struct sock *sk = sock->sk;
627 struct sockaddr_pppox *sp = (struct sockaddr_pppox *)uservaddr;
628 struct pppox_sock *po = pppox_sk(sk);
629 struct net_device *dev = NULL;
630 struct pppoe_net *pn;
631 struct net *net = NULL;
632 int error;
633
634 lock_sock(sk);
635
636 INIT_WORK(&po->proto.pppoe.padt_work, pppoe_unbind_sock_work);
637
638 error = -EINVAL;
639 if (sp->sa_protocol != PX_PROTO_OE)
640 goto end;
641
642
643 error = -EBUSY;
644 if ((sk->sk_state & PPPOX_CONNECTED) &&
645 stage_session(sp->sa_addr.pppoe.sid))
646 goto end;
647
648
649 error = -EALREADY;
650 if ((sk->sk_state & PPPOX_DEAD) &&
651 !stage_session(sp->sa_addr.pppoe.sid))
652 goto end;
653
654 error = 0;
655
656
657 if (stage_session(po->pppoe_pa.sid)) {
658 pppox_unbind_sock(sk);
659 pn = pppoe_pernet(sock_net(sk));
660 delete_item(pn, po->pppoe_pa.sid,
661 po->pppoe_pa.remote, po->pppoe_ifindex);
662 if (po->pppoe_dev) {
663 dev_put(po->pppoe_dev);
664 po->pppoe_dev = NULL;
665 }
666
667 memset(sk_pppox(po) + 1, 0,
668 sizeof(struct pppox_sock) - sizeof(struct sock));
669 sk->sk_state = PPPOX_NONE;
670 }
671
672
673 if (stage_session(sp->sa_addr.pppoe.sid)) {
674 error = -ENODEV;
675 net = sock_net(sk);
676 dev = dev_get_by_name(net, sp->sa_addr.pppoe.dev);
677 if (!dev)
678 goto err_put;
679
680 po->pppoe_dev = dev;
681 po->pppoe_ifindex = dev->ifindex;
682 pn = pppoe_pernet(net);
683 if (!(dev->flags & IFF_UP)) {
684 goto err_put;
685 }
686
687 memcpy(&po->pppoe_pa,
688 &sp->sa_addr.pppoe,
689 sizeof(struct pppoe_addr));
690
691 write_lock_bh(&pn->hash_lock);
692 error = __set_item(pn, po);
693 write_unlock_bh(&pn->hash_lock);
694 if (error < 0)
695 goto err_put;
696
697 po->chan.hdrlen = (sizeof(struct pppoe_hdr) +
698 dev->hard_header_len);
699
700 po->chan.mtu = dev->mtu - sizeof(struct pppoe_hdr) - 2;
701 po->chan.private = sk;
702 po->chan.ops = &pppoe_chan_ops;
703
704 error = ppp_register_net_channel(dev_net(dev), &po->chan);
705 if (error) {
706 delete_item(pn, po->pppoe_pa.sid,
707 po->pppoe_pa.remote, po->pppoe_ifindex);
708 goto err_put;
709 }
710
711 sk->sk_state = PPPOX_CONNECTED;
712 }
713
714 po->num = sp->sa_addr.pppoe.sid;
715
716end:
717 release_sock(sk);
718 return error;
719err_put:
720 if (po->pppoe_dev) {
721 dev_put(po->pppoe_dev);
722 po->pppoe_dev = NULL;
723 }
724 goto end;
725}
726
727static int pppoe_getname(struct socket *sock, struct sockaddr *uaddr,
728 int *usockaddr_len, int peer)
729{
730 int len = sizeof(struct sockaddr_pppox);
731 struct sockaddr_pppox sp;
732
733 sp.sa_family = AF_PPPOX;
734 sp.sa_protocol = PX_PROTO_OE;
735 memcpy(&sp.sa_addr.pppoe, &pppox_sk(sock->sk)->pppoe_pa,
736 sizeof(struct pppoe_addr));
737
738 memcpy(uaddr, &sp, len);
739
740 *usockaddr_len = len;
741
742 return 0;
743}
744
745static int pppoe_ioctl(struct socket *sock, unsigned int cmd,
746 unsigned long arg)
747{
748 struct sock *sk = sock->sk;
749 struct pppox_sock *po = pppox_sk(sk);
750 int val;
751 int err;
752
753 switch (cmd) {
754 case PPPIOCGMRU:
755 err = -ENXIO;
756 if (!(sk->sk_state & PPPOX_CONNECTED))
757 break;
758
759 err = -EFAULT;
760 if (put_user(po->pppoe_dev->mtu -
761 sizeof(struct pppoe_hdr) -
762 PPP_HDRLEN,
763 (int __user *)arg))
764 break;
765 err = 0;
766 break;
767
768 case PPPIOCSMRU:
769 err = -ENXIO;
770 if (!(sk->sk_state & PPPOX_CONNECTED))
771 break;
772
773 err = -EFAULT;
774 if (get_user(val, (int __user *)arg))
775 break;
776
777 if (val < (po->pppoe_dev->mtu
778 - sizeof(struct pppoe_hdr)
779 - PPP_HDRLEN))
780 err = 0;
781 else
782 err = -EINVAL;
783 break;
784
785 case PPPIOCSFLAGS:
786 err = -EFAULT;
787 if (get_user(val, (int __user *)arg))
788 break;
789 err = 0;
790 break;
791
792 case PPPOEIOCSFWD:
793 {
794 struct pppox_sock *relay_po;
795
796 err = -EBUSY;
797 if (sk->sk_state & (PPPOX_BOUND | PPPOX_ZOMBIE | PPPOX_DEAD))
798 break;
799
800 err = -ENOTCONN;
801 if (!(sk->sk_state & PPPOX_CONNECTED))
802 break;
803
804
805
806 err = -EFAULT;
807 if (copy_from_user(&po->pppoe_relay,
808 (void __user *)arg,
809 sizeof(struct sockaddr_pppox)))
810 break;
811
812 err = -EINVAL;
813 if (po->pppoe_relay.sa_family != AF_PPPOX ||
814 po->pppoe_relay.sa_protocol != PX_PROTO_OE)
815 break;
816
817
818
819 relay_po = get_item_by_addr(sock_net(sk), &po->pppoe_relay);
820 if (!relay_po)
821 break;
822
823 sock_put(sk_pppox(relay_po));
824 sk->sk_state |= PPPOX_RELAY;
825 err = 0;
826 break;
827 }
828
829 case PPPOEIOCDFWD:
830 err = -EALREADY;
831 if (!(sk->sk_state & PPPOX_RELAY))
832 break;
833
834 sk->sk_state &= ~PPPOX_RELAY;
835 err = 0;
836 break;
837
838 default:
839 err = -ENOTTY;
840 }
841
842 return err;
843}
844
845static int pppoe_sendmsg(struct socket *sock, struct msghdr *m,
846 size_t total_len)
847{
848 struct sk_buff *skb;
849 struct sock *sk = sock->sk;
850 struct pppox_sock *po = pppox_sk(sk);
851 int error;
852 struct pppoe_hdr hdr;
853 struct pppoe_hdr *ph;
854 struct net_device *dev;
855 char *start;
856
857 lock_sock(sk);
858 if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED)) {
859 error = -ENOTCONN;
860 goto end;
861 }
862
863 hdr.ver = 1;
864 hdr.type = 1;
865 hdr.code = 0;
866 hdr.sid = po->num;
867
868 dev = po->pppoe_dev;
869
870 error = -EMSGSIZE;
871 if (total_len > (dev->mtu + dev->hard_header_len))
872 goto end;
873
874
875 skb = sock_wmalloc(sk, total_len + dev->hard_header_len + 32,
876 0, GFP_KERNEL);
877 if (!skb) {
878 error = -ENOMEM;
879 goto end;
880 }
881
882
883 skb_reserve(skb, dev->hard_header_len);
884 skb_reset_network_header(skb);
885
886 skb->dev = dev;
887
888 skb->priority = sk->sk_priority;
889 skb->protocol = cpu_to_be16(ETH_P_PPP_SES);
890
891 ph = (struct pppoe_hdr *)skb_put(skb, total_len + sizeof(struct pppoe_hdr));
892 start = (char *)&ph->tag[0];
893
894 error = memcpy_from_msg(start, m, total_len);
895 if (error < 0) {
896 kfree_skb(skb);
897 goto end;
898 }
899
900 error = total_len;
901 dev_hard_header(skb, dev, ETH_P_PPP_SES,
902 po->pppoe_pa.remote, NULL, total_len);
903
904 memcpy(ph, &hdr, sizeof(struct pppoe_hdr));
905
906 ph->length = htons(total_len);
907
908 dev_queue_xmit(skb);
909
910end:
911 release_sock(sk);
912 return error;
913}
914
915
916
917
918
919
920static int __pppoe_xmit(struct sock *sk, struct sk_buff *skb)
921{
922 struct pppox_sock *po = pppox_sk(sk);
923 struct net_device *dev = po->pppoe_dev;
924 struct pppoe_hdr *ph;
925 int data_len = skb->len;
926
927
928
929
930
931
932
933
934
935 if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED))
936 goto abort;
937
938 if (!dev)
939 goto abort;
940
941
942
943
944 if (skb_cow_head(skb, sizeof(*ph) + dev->hard_header_len))
945 goto abort;
946
947 __skb_push(skb, sizeof(*ph));
948 skb_reset_network_header(skb);
949
950 ph = pppoe_hdr(skb);
951 ph->ver = 1;
952 ph->type = 1;
953 ph->code = 0;
954 ph->sid = po->num;
955 ph->length = htons(data_len);
956
957 skb->protocol = cpu_to_be16(ETH_P_PPP_SES);
958 skb->dev = dev;
959
960 dev_hard_header(skb, dev, ETH_P_PPP_SES,
961 po->pppoe_pa.remote, NULL, data_len);
962
963 dev_queue_xmit(skb);
964 return 1;
965
966abort:
967 kfree_skb(skb);
968 return 1;
969}
970
971
972
973
974
975
976
977static int pppoe_xmit(struct ppp_channel *chan, struct sk_buff *skb)
978{
979 struct sock *sk = (struct sock *)chan->private;
980 return __pppoe_xmit(sk, skb);
981}
982
983static const struct ppp_channel_ops pppoe_chan_ops = {
984 .start_xmit = pppoe_xmit,
985};
986
987static int pppoe_recvmsg(struct socket *sock, struct msghdr *m,
988 size_t total_len, int flags)
989{
990 struct sock *sk = sock->sk;
991 struct sk_buff *skb;
992 int error = 0;
993
994 if (sk->sk_state & PPPOX_BOUND) {
995 error = -EIO;
996 goto end;
997 }
998
999 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1000 flags & MSG_DONTWAIT, &error);
1001 if (error < 0)
1002 goto end;
1003
1004 if (skb) {
1005 total_len = min_t(size_t, total_len, skb->len);
1006 error = skb_copy_datagram_msg(skb, 0, m, total_len);
1007 if (error == 0) {
1008 consume_skb(skb);
1009 return total_len;
1010 }
1011 }
1012
1013 kfree_skb(skb);
1014end:
1015 return error;
1016}
1017
1018#ifdef CONFIG_PROC_FS
1019static int pppoe_seq_show(struct seq_file *seq, void *v)
1020{
1021 struct pppox_sock *po;
1022 char *dev_name;
1023
1024 if (v == SEQ_START_TOKEN) {
1025 seq_puts(seq, "Id Address Device\n");
1026 goto out;
1027 }
1028
1029 po = v;
1030 dev_name = po->pppoe_pa.dev;
1031
1032 seq_printf(seq, "%08X %pM %8s\n",
1033 po->pppoe_pa.sid, po->pppoe_pa.remote, dev_name);
1034out:
1035 return 0;
1036}
1037
1038static inline struct pppox_sock *pppoe_get_idx(struct pppoe_net *pn, loff_t pos)
1039{
1040 struct pppox_sock *po;
1041 int i;
1042
1043 for (i = 0; i < PPPOE_HASH_SIZE; i++) {
1044 po = pn->hash_table[i];
1045 while (po) {
1046 if (!pos--)
1047 goto out;
1048 po = po->next;
1049 }
1050 }
1051
1052out:
1053 return po;
1054}
1055
1056static void *pppoe_seq_start(struct seq_file *seq, loff_t *pos)
1057 __acquires(pn->hash_lock)
1058{
1059 struct pppoe_net *pn = pppoe_pernet(seq_file_net(seq));
1060 loff_t l = *pos;
1061
1062 read_lock_bh(&pn->hash_lock);
1063 return l ? pppoe_get_idx(pn, --l) : SEQ_START_TOKEN;
1064}
1065
1066static void *pppoe_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1067{
1068 struct pppoe_net *pn = pppoe_pernet(seq_file_net(seq));
1069 struct pppox_sock *po;
1070
1071 ++*pos;
1072 if (v == SEQ_START_TOKEN) {
1073 po = pppoe_get_idx(pn, 0);
1074 goto out;
1075 }
1076 po = v;
1077 if (po->next)
1078 po = po->next;
1079 else {
1080 int hash = hash_item(po->pppoe_pa.sid, po->pppoe_pa.remote);
1081
1082 po = NULL;
1083 while (++hash < PPPOE_HASH_SIZE) {
1084 po = pn->hash_table[hash];
1085 if (po)
1086 break;
1087 }
1088 }
1089
1090out:
1091 return po;
1092}
1093
1094static void pppoe_seq_stop(struct seq_file *seq, void *v)
1095 __releases(pn->hash_lock)
1096{
1097 struct pppoe_net *pn = pppoe_pernet(seq_file_net(seq));
1098 read_unlock_bh(&pn->hash_lock);
1099}
1100
1101static const struct seq_operations pppoe_seq_ops = {
1102 .start = pppoe_seq_start,
1103 .next = pppoe_seq_next,
1104 .stop = pppoe_seq_stop,
1105 .show = pppoe_seq_show,
1106};
1107
1108static int pppoe_seq_open(struct inode *inode, struct file *file)
1109{
1110 return seq_open_net(inode, file, &pppoe_seq_ops,
1111 sizeof(struct seq_net_private));
1112}
1113
1114static const struct file_operations pppoe_seq_fops = {
1115 .owner = THIS_MODULE,
1116 .open = pppoe_seq_open,
1117 .read = seq_read,
1118 .llseek = seq_lseek,
1119 .release = seq_release_net,
1120};
1121
1122#endif
1123
1124static const struct proto_ops pppoe_ops = {
1125 .family = AF_PPPOX,
1126 .owner = THIS_MODULE,
1127 .release = pppoe_release,
1128 .bind = sock_no_bind,
1129 .connect = pppoe_connect,
1130 .socketpair = sock_no_socketpair,
1131 .accept = sock_no_accept,
1132 .getname = pppoe_getname,
1133 .poll = datagram_poll,
1134 .listen = sock_no_listen,
1135 .shutdown = sock_no_shutdown,
1136 .setsockopt = sock_no_setsockopt,
1137 .getsockopt = sock_no_getsockopt,
1138 .sendmsg = pppoe_sendmsg,
1139 .recvmsg = pppoe_recvmsg,
1140 .mmap = sock_no_mmap,
1141 .ioctl = pppox_ioctl,
1142};
1143
1144static const struct pppox_proto pppoe_proto = {
1145 .create = pppoe_create,
1146 .ioctl = pppoe_ioctl,
1147 .owner = THIS_MODULE,
1148};
1149
1150static __net_init int pppoe_init_net(struct net *net)
1151{
1152 struct pppoe_net *pn = pppoe_pernet(net);
1153 struct proc_dir_entry *pde;
1154
1155 rwlock_init(&pn->hash_lock);
1156
1157 pde = proc_create("pppoe", S_IRUGO, net->proc_net, &pppoe_seq_fops);
1158#ifdef CONFIG_PROC_FS
1159 if (!pde)
1160 return -ENOMEM;
1161#endif
1162
1163 return 0;
1164}
1165
1166static __net_exit void pppoe_exit_net(struct net *net)
1167{
1168 remove_proc_entry("pppoe", net->proc_net);
1169}
1170
1171static struct pernet_operations pppoe_net_ops = {
1172 .init = pppoe_init_net,
1173 .exit = pppoe_exit_net,
1174 .id = &pppoe_net_id,
1175 .size = sizeof(struct pppoe_net),
1176};
1177
1178static int __init pppoe_init(void)
1179{
1180 int err;
1181
1182 err = register_pernet_device(&pppoe_net_ops);
1183 if (err)
1184 goto out;
1185
1186 err = proto_register(&pppoe_sk_proto, 0);
1187 if (err)
1188 goto out_unregister_net_ops;
1189
1190 err = register_pppox_proto(PX_PROTO_OE, &pppoe_proto);
1191 if (err)
1192 goto out_unregister_pppoe_proto;
1193
1194 dev_add_pack(&pppoes_ptype);
1195 dev_add_pack(&pppoed_ptype);
1196 register_netdevice_notifier(&pppoe_notifier);
1197
1198 return 0;
1199
1200out_unregister_pppoe_proto:
1201 proto_unregister(&pppoe_sk_proto);
1202out_unregister_net_ops:
1203 unregister_pernet_device(&pppoe_net_ops);
1204out:
1205 return err;
1206}
1207
1208static void __exit pppoe_exit(void)
1209{
1210 unregister_netdevice_notifier(&pppoe_notifier);
1211 dev_remove_pack(&pppoed_ptype);
1212 dev_remove_pack(&pppoes_ptype);
1213 unregister_pppox_proto(PX_PROTO_OE);
1214 proto_unregister(&pppoe_sk_proto);
1215 unregister_pernet_device(&pppoe_net_ops);
1216}
1217
1218module_init(pppoe_init);
1219module_exit(pppoe_exit);
1220
1221MODULE_AUTHOR("Michal Ostrowski <mostrows@speakeasy.net>");
1222MODULE_DESCRIPTION("PPP over Ethernet driver");
1223MODULE_LICENSE("GPL");
1224MODULE_ALIAS_NETPROTO(PF_PPPOX);
1225