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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 && !memcmp(a->remote, b->remote, ETH_ALEN);
135}
136
137static inline int cmp_addr(struct pppoe_addr *a, __be16 sid, char *addr)
138{
139 return a->sid == sid && !memcmp(a->remote, addr, ETH_ALEN);
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 = (struct net_device *)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 (sk->sk_state & PPPOX_BOUND) {
384 ppp_input(&po->chan, skb);
385 } else if (sk->sk_state & PPPOX_RELAY) {
386 relay_po = get_item_by_addr(sock_net(sk),
387 &po->pppoe_relay);
388 if (relay_po == NULL)
389 goto abort_kfree;
390
391 if ((sk_pppox(relay_po)->sk_state & PPPOX_CONNECTED) == 0)
392 goto abort_put;
393
394 if (!__pppoe_xmit(sk_pppox(relay_po), skb))
395 goto abort_put;
396 } else {
397 if (sock_queue_rcv_skb(sk, skb))
398 goto abort_kfree;
399 }
400
401 return NET_RX_SUCCESS;
402
403abort_put:
404 sock_put(sk_pppox(relay_po));
405
406abort_kfree:
407 kfree_skb(skb);
408 return NET_RX_DROP;
409}
410
411
412
413
414
415
416static int pppoe_rcv(struct sk_buff *skb, struct net_device *dev,
417 struct packet_type *pt, struct net_device *orig_dev)
418{
419 struct pppoe_hdr *ph;
420 struct pppox_sock *po;
421 struct pppoe_net *pn;
422 int len;
423
424 skb = skb_share_check(skb, GFP_ATOMIC);
425 if (!skb)
426 goto out;
427
428 if (!pskb_may_pull(skb, sizeof(struct pppoe_hdr)))
429 goto drop;
430
431 ph = pppoe_hdr(skb);
432 len = ntohs(ph->length);
433
434 skb_pull_rcsum(skb, sizeof(*ph));
435 if (skb->len < len)
436 goto drop;
437
438 if (pskb_trim_rcsum(skb, len))
439 goto drop;
440
441 pn = pppoe_pernet(dev_net(dev));
442
443
444
445
446 po = get_item(pn, ph->sid, eth_hdr(skb)->h_source, dev->ifindex);
447 if (!po)
448 goto drop;
449
450 return sk_receive_skb(sk_pppox(po), skb, 0);
451
452drop:
453 kfree_skb(skb);
454out:
455 return NET_RX_DROP;
456}
457
458
459
460
461
462
463
464static int pppoe_disc_rcv(struct sk_buff *skb, struct net_device *dev,
465 struct packet_type *pt, struct net_device *orig_dev)
466
467{
468 struct pppoe_hdr *ph;
469 struct pppox_sock *po;
470 struct pppoe_net *pn;
471
472 skb = skb_share_check(skb, GFP_ATOMIC);
473 if (!skb)
474 goto out;
475
476 if (!pskb_may_pull(skb, sizeof(struct pppoe_hdr)))
477 goto abort;
478
479 ph = pppoe_hdr(skb);
480 if (ph->code != PADT_CODE)
481 goto abort;
482
483 pn = pppoe_pernet(dev_net(dev));
484 po = get_item(pn, ph->sid, eth_hdr(skb)->h_source, dev->ifindex);
485 if (po) {
486 struct sock *sk = sk_pppox(po);
487
488 bh_lock_sock(sk);
489
490
491
492
493
494
495 if (sock_owned_by_user(sk) == 0) {
496
497
498
499 sk->sk_state = PPPOX_ZOMBIE;
500 }
501
502 bh_unlock_sock(sk);
503 sock_put(sk);
504 }
505
506abort:
507 kfree_skb(skb);
508out:
509 return NET_RX_SUCCESS;
510}
511
512static struct packet_type pppoes_ptype __read_mostly = {
513 .type = cpu_to_be16(ETH_P_PPP_SES),
514 .func = pppoe_rcv,
515};
516
517static struct packet_type pppoed_ptype __read_mostly = {
518 .type = cpu_to_be16(ETH_P_PPP_DISC),
519 .func = pppoe_disc_rcv,
520};
521
522static struct proto pppoe_sk_proto __read_mostly = {
523 .name = "PPPOE",
524 .owner = THIS_MODULE,
525 .obj_size = sizeof(struct pppox_sock),
526};
527
528
529
530
531
532
533static int pppoe_create(struct net *net, struct socket *sock)
534{
535 struct sock *sk;
536
537 sk = sk_alloc(net, PF_PPPOX, GFP_KERNEL, &pppoe_sk_proto);
538 if (!sk)
539 return -ENOMEM;
540
541 sock_init_data(sock, sk);
542
543 sock->state = SS_UNCONNECTED;
544 sock->ops = &pppoe_ops;
545
546 sk->sk_backlog_rcv = pppoe_rcv_core;
547 sk->sk_state = PPPOX_NONE;
548 sk->sk_type = SOCK_STREAM;
549 sk->sk_family = PF_PPPOX;
550 sk->sk_protocol = PX_PROTO_OE;
551
552 return 0;
553}
554
555static int pppoe_release(struct socket *sock)
556{
557 struct sock *sk = sock->sk;
558 struct pppox_sock *po;
559 struct pppoe_net *pn;
560 struct net *net = NULL;
561
562 if (!sk)
563 return 0;
564
565 lock_sock(sk);
566 if (sock_flag(sk, SOCK_DEAD)) {
567 release_sock(sk);
568 return -EBADF;
569 }
570
571 po = pppox_sk(sk);
572
573 if (sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND | PPPOX_ZOMBIE)) {
574 dev_put(po->pppoe_dev);
575 po->pppoe_dev = NULL;
576 }
577
578 pppox_unbind_sock(sk);
579
580
581 sk->sk_state = PPPOX_DEAD;
582
583 net = sock_net(sk);
584 pn = pppoe_pernet(net);
585
586
587
588
589
590 delete_item(pn, po->pppoe_pa.sid, po->pppoe_pa.remote,
591 po->pppoe_ifindex);
592
593 sock_orphan(sk);
594 sock->sk = NULL;
595
596 skb_queue_purge(&sk->sk_receive_queue);
597 release_sock(sk);
598 sock_put(sk);
599
600 return 0;
601}
602
603static int pppoe_connect(struct socket *sock, struct sockaddr *uservaddr,
604 int sockaddr_len, int flags)
605{
606 struct sock *sk = sock->sk;
607 struct sockaddr_pppox *sp = (struct sockaddr_pppox *)uservaddr;
608 struct pppox_sock *po = pppox_sk(sk);
609 struct net_device *dev = NULL;
610 struct pppoe_net *pn;
611 struct net *net = NULL;
612 int error;
613
614 lock_sock(sk);
615
616 error = -EINVAL;
617 if (sp->sa_protocol != PX_PROTO_OE)
618 goto end;
619
620
621 error = -EBUSY;
622 if ((sk->sk_state & PPPOX_CONNECTED) &&
623 stage_session(sp->sa_addr.pppoe.sid))
624 goto end;
625
626
627 error = -EALREADY;
628 if ((sk->sk_state & PPPOX_DEAD) &&
629 !stage_session(sp->sa_addr.pppoe.sid))
630 goto end;
631
632 error = 0;
633
634
635 if (stage_session(po->pppoe_pa.sid)) {
636 pppox_unbind_sock(sk);
637 pn = pppoe_pernet(sock_net(sk));
638 delete_item(pn, po->pppoe_pa.sid,
639 po->pppoe_pa.remote, po->pppoe_ifindex);
640 if (po->pppoe_dev) {
641 dev_put(po->pppoe_dev);
642 po->pppoe_dev = NULL;
643 }
644
645 memset(sk_pppox(po) + 1, 0,
646 sizeof(struct pppox_sock) - sizeof(struct sock));
647 sk->sk_state = PPPOX_NONE;
648 }
649
650
651 if (stage_session(sp->sa_addr.pppoe.sid)) {
652 error = -ENODEV;
653 net = sock_net(sk);
654 dev = dev_get_by_name(net, sp->sa_addr.pppoe.dev);
655 if (!dev)
656 goto err_put;
657
658 po->pppoe_dev = dev;
659 po->pppoe_ifindex = dev->ifindex;
660 pn = pppoe_pernet(net);
661 if (!(dev->flags & IFF_UP)) {
662 goto err_put;
663 }
664
665 memcpy(&po->pppoe_pa,
666 &sp->sa_addr.pppoe,
667 sizeof(struct pppoe_addr));
668
669 write_lock_bh(&pn->hash_lock);
670 error = __set_item(pn, po);
671 write_unlock_bh(&pn->hash_lock);
672 if (error < 0)
673 goto err_put;
674
675 po->chan.hdrlen = (sizeof(struct pppoe_hdr) +
676 dev->hard_header_len);
677
678 po->chan.mtu = dev->mtu - sizeof(struct pppoe_hdr);
679 po->chan.private = sk;
680 po->chan.ops = &pppoe_chan_ops;
681
682 error = ppp_register_net_channel(dev_net(dev), &po->chan);
683 if (error) {
684 delete_item(pn, po->pppoe_pa.sid,
685 po->pppoe_pa.remote, po->pppoe_ifindex);
686 goto err_put;
687 }
688
689 sk->sk_state = PPPOX_CONNECTED;
690 }
691
692 po->num = sp->sa_addr.pppoe.sid;
693
694end:
695 release_sock(sk);
696 return error;
697err_put:
698 if (po->pppoe_dev) {
699 dev_put(po->pppoe_dev);
700 po->pppoe_dev = NULL;
701 }
702 goto end;
703}
704
705static int pppoe_getname(struct socket *sock, struct sockaddr *uaddr,
706 int *usockaddr_len, int peer)
707{
708 int len = sizeof(struct sockaddr_pppox);
709 struct sockaddr_pppox sp;
710
711 sp.sa_family = AF_PPPOX;
712 sp.sa_protocol = PX_PROTO_OE;
713 memcpy(&sp.sa_addr.pppoe, &pppox_sk(sock->sk)->pppoe_pa,
714 sizeof(struct pppoe_addr));
715
716 memcpy(uaddr, &sp, len);
717
718 *usockaddr_len = len;
719
720 return 0;
721}
722
723static int pppoe_ioctl(struct socket *sock, unsigned int cmd,
724 unsigned long arg)
725{
726 struct sock *sk = sock->sk;
727 struct pppox_sock *po = pppox_sk(sk);
728 int val;
729 int err;
730
731 switch (cmd) {
732 case PPPIOCGMRU:
733 err = -ENXIO;
734 if (!(sk->sk_state & PPPOX_CONNECTED))
735 break;
736
737 err = -EFAULT;
738 if (put_user(po->pppoe_dev->mtu -
739 sizeof(struct pppoe_hdr) -
740 PPP_HDRLEN,
741 (int __user *)arg))
742 break;
743 err = 0;
744 break;
745
746 case PPPIOCSMRU:
747 err = -ENXIO;
748 if (!(sk->sk_state & PPPOX_CONNECTED))
749 break;
750
751 err = -EFAULT;
752 if (get_user(val, (int __user *)arg))
753 break;
754
755 if (val < (po->pppoe_dev->mtu
756 - sizeof(struct pppoe_hdr)
757 - PPP_HDRLEN))
758 err = 0;
759 else
760 err = -EINVAL;
761 break;
762
763 case PPPIOCSFLAGS:
764 err = -EFAULT;
765 if (get_user(val, (int __user *)arg))
766 break;
767 err = 0;
768 break;
769
770 case PPPOEIOCSFWD:
771 {
772 struct pppox_sock *relay_po;
773
774 err = -EBUSY;
775 if (sk->sk_state & (PPPOX_BOUND | PPPOX_ZOMBIE | PPPOX_DEAD))
776 break;
777
778 err = -ENOTCONN;
779 if (!(sk->sk_state & PPPOX_CONNECTED))
780 break;
781
782
783
784 err = -EFAULT;
785 if (copy_from_user(&po->pppoe_relay,
786 (void __user *)arg,
787 sizeof(struct sockaddr_pppox)))
788 break;
789
790 err = -EINVAL;
791 if (po->pppoe_relay.sa_family != AF_PPPOX ||
792 po->pppoe_relay.sa_protocol != PX_PROTO_OE)
793 break;
794
795
796
797 relay_po = get_item_by_addr(sock_net(sk), &po->pppoe_relay);
798 if (!relay_po)
799 break;
800
801 sock_put(sk_pppox(relay_po));
802 sk->sk_state |= PPPOX_RELAY;
803 err = 0;
804 break;
805 }
806
807 case PPPOEIOCDFWD:
808 err = -EALREADY;
809 if (!(sk->sk_state & PPPOX_RELAY))
810 break;
811
812 sk->sk_state &= ~PPPOX_RELAY;
813 err = 0;
814 break;
815
816 default:
817 err = -ENOTTY;
818 }
819
820 return err;
821}
822
823static int pppoe_sendmsg(struct kiocb *iocb, struct socket *sock,
824 struct msghdr *m, size_t total_len)
825{
826 struct sk_buff *skb;
827 struct sock *sk = sock->sk;
828 struct pppox_sock *po = pppox_sk(sk);
829 int error;
830 struct pppoe_hdr hdr;
831 struct pppoe_hdr *ph;
832 struct net_device *dev;
833 char *start;
834
835 lock_sock(sk);
836 if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED)) {
837 error = -ENOTCONN;
838 goto end;
839 }
840
841 hdr.ver = 1;
842 hdr.type = 1;
843 hdr.code = 0;
844 hdr.sid = po->num;
845
846 dev = po->pppoe_dev;
847
848 error = -EMSGSIZE;
849 if (total_len > (dev->mtu + dev->hard_header_len))
850 goto end;
851
852
853 skb = sock_wmalloc(sk, total_len + dev->hard_header_len + 32,
854 0, GFP_KERNEL);
855 if (!skb) {
856 error = -ENOMEM;
857 goto end;
858 }
859
860
861 skb_reserve(skb, dev->hard_header_len);
862 skb_reset_network_header(skb);
863
864 skb->dev = dev;
865
866 skb->priority = sk->sk_priority;
867 skb->protocol = cpu_to_be16(ETH_P_PPP_SES);
868
869 ph = (struct pppoe_hdr *)skb_put(skb, total_len + sizeof(struct pppoe_hdr));
870 start = (char *)&ph->tag[0];
871
872 error = memcpy_fromiovec(start, m->msg_iov, total_len);
873 if (error < 0) {
874 kfree_skb(skb);
875 goto end;
876 }
877
878 error = total_len;
879 dev_hard_header(skb, dev, ETH_P_PPP_SES,
880 po->pppoe_pa.remote, NULL, total_len);
881
882 memcpy(ph, &hdr, sizeof(struct pppoe_hdr));
883
884 ph->length = htons(total_len);
885
886 dev_queue_xmit(skb);
887
888end:
889 release_sock(sk);
890 return error;
891}
892
893
894
895
896
897
898static int __pppoe_xmit(struct sock *sk, struct sk_buff *skb)
899{
900 struct pppox_sock *po = pppox_sk(sk);
901 struct net_device *dev = po->pppoe_dev;
902 struct pppoe_hdr *ph;
903 int data_len = skb->len;
904
905
906
907
908
909
910
911
912
913 if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED))
914 goto abort;
915
916 if (!dev)
917 goto abort;
918
919
920
921
922 if (skb_cow_head(skb, sizeof(*ph) + dev->hard_header_len))
923 goto abort;
924
925 __skb_push(skb, sizeof(*ph));
926 skb_reset_network_header(skb);
927
928 ph = pppoe_hdr(skb);
929 ph->ver = 1;
930 ph->type = 1;
931 ph->code = 0;
932 ph->sid = po->num;
933 ph->length = htons(data_len);
934
935 skb->protocol = cpu_to_be16(ETH_P_PPP_SES);
936 skb->dev = dev;
937
938 dev_hard_header(skb, dev, ETH_P_PPP_SES,
939 po->pppoe_pa.remote, NULL, data_len);
940
941 dev_queue_xmit(skb);
942 return 1;
943
944abort:
945 kfree_skb(skb);
946 return 1;
947}
948
949
950
951
952
953
954
955static int pppoe_xmit(struct ppp_channel *chan, struct sk_buff *skb)
956{
957 struct sock *sk = (struct sock *)chan->private;
958 return __pppoe_xmit(sk, skb);
959}
960
961static const struct ppp_channel_ops pppoe_chan_ops = {
962 .start_xmit = pppoe_xmit,
963};
964
965static int pppoe_recvmsg(struct kiocb *iocb, struct socket *sock,
966 struct msghdr *m, size_t total_len, int flags)
967{
968 struct sock *sk = sock->sk;
969 struct sk_buff *skb;
970 int error = 0;
971
972 if (sk->sk_state & PPPOX_BOUND) {
973 error = -EIO;
974 goto end;
975 }
976
977 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
978 flags & MSG_DONTWAIT, &error);
979 if (error < 0)
980 goto end;
981
982 m->msg_namelen = 0;
983
984 if (skb) {
985 total_len = min_t(size_t, total_len, skb->len);
986 error = skb_copy_datagram_iovec(skb, 0, m->msg_iov, total_len);
987 if (error == 0) {
988 consume_skb(skb);
989 return total_len;
990 }
991 }
992
993 kfree_skb(skb);
994end:
995 return error;
996}
997
998#ifdef CONFIG_PROC_FS
999static int pppoe_seq_show(struct seq_file *seq, void *v)
1000{
1001 struct pppox_sock *po;
1002 char *dev_name;
1003
1004 if (v == SEQ_START_TOKEN) {
1005 seq_puts(seq, "Id Address Device\n");
1006 goto out;
1007 }
1008
1009 po = v;
1010 dev_name = po->pppoe_pa.dev;
1011
1012 seq_printf(seq, "%08X %pM %8s\n",
1013 po->pppoe_pa.sid, po->pppoe_pa.remote, dev_name);
1014out:
1015 return 0;
1016}
1017
1018static inline struct pppox_sock *pppoe_get_idx(struct pppoe_net *pn, loff_t pos)
1019{
1020 struct pppox_sock *po;
1021 int i;
1022
1023 for (i = 0; i < PPPOE_HASH_SIZE; i++) {
1024 po = pn->hash_table[i];
1025 while (po) {
1026 if (!pos--)
1027 goto out;
1028 po = po->next;
1029 }
1030 }
1031
1032out:
1033 return po;
1034}
1035
1036static void *pppoe_seq_start(struct seq_file *seq, loff_t *pos)
1037 __acquires(pn->hash_lock)
1038{
1039 struct pppoe_net *pn = pppoe_pernet(seq_file_net(seq));
1040 loff_t l = *pos;
1041
1042 read_lock_bh(&pn->hash_lock);
1043 return l ? pppoe_get_idx(pn, --l) : SEQ_START_TOKEN;
1044}
1045
1046static void *pppoe_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1047{
1048 struct pppoe_net *pn = pppoe_pernet(seq_file_net(seq));
1049 struct pppox_sock *po;
1050
1051 ++*pos;
1052 if (v == SEQ_START_TOKEN) {
1053 po = pppoe_get_idx(pn, 0);
1054 goto out;
1055 }
1056 po = v;
1057 if (po->next)
1058 po = po->next;
1059 else {
1060 int hash = hash_item(po->pppoe_pa.sid, po->pppoe_pa.remote);
1061
1062 po = NULL;
1063 while (++hash < PPPOE_HASH_SIZE) {
1064 po = pn->hash_table[hash];
1065 if (po)
1066 break;
1067 }
1068 }
1069
1070out:
1071 return po;
1072}
1073
1074static void pppoe_seq_stop(struct seq_file *seq, void *v)
1075 __releases(pn->hash_lock)
1076{
1077 struct pppoe_net *pn = pppoe_pernet(seq_file_net(seq));
1078 read_unlock_bh(&pn->hash_lock);
1079}
1080
1081static const struct seq_operations pppoe_seq_ops = {
1082 .start = pppoe_seq_start,
1083 .next = pppoe_seq_next,
1084 .stop = pppoe_seq_stop,
1085 .show = pppoe_seq_show,
1086};
1087
1088static int pppoe_seq_open(struct inode *inode, struct file *file)
1089{
1090 return seq_open_net(inode, file, &pppoe_seq_ops,
1091 sizeof(struct seq_net_private));
1092}
1093
1094static const struct file_operations pppoe_seq_fops = {
1095 .owner = THIS_MODULE,
1096 .open = pppoe_seq_open,
1097 .read = seq_read,
1098 .llseek = seq_lseek,
1099 .release = seq_release_net,
1100};
1101
1102#endif
1103
1104static const struct proto_ops pppoe_ops = {
1105 .family = AF_PPPOX,
1106 .owner = THIS_MODULE,
1107 .release = pppoe_release,
1108 .bind = sock_no_bind,
1109 .connect = pppoe_connect,
1110 .socketpair = sock_no_socketpair,
1111 .accept = sock_no_accept,
1112 .getname = pppoe_getname,
1113 .poll = datagram_poll,
1114 .listen = sock_no_listen,
1115 .shutdown = sock_no_shutdown,
1116 .setsockopt = sock_no_setsockopt,
1117 .getsockopt = sock_no_getsockopt,
1118 .sendmsg = pppoe_sendmsg,
1119 .recvmsg = pppoe_recvmsg,
1120 .mmap = sock_no_mmap,
1121 .ioctl = pppox_ioctl,
1122};
1123
1124static const struct pppox_proto pppoe_proto = {
1125 .create = pppoe_create,
1126 .ioctl = pppoe_ioctl,
1127 .owner = THIS_MODULE,
1128};
1129
1130static __net_init int pppoe_init_net(struct net *net)
1131{
1132 struct pppoe_net *pn = pppoe_pernet(net);
1133 struct proc_dir_entry *pde;
1134
1135 rwlock_init(&pn->hash_lock);
1136
1137 pde = proc_net_fops_create(net, "pppoe", S_IRUGO, &pppoe_seq_fops);
1138#ifdef CONFIG_PROC_FS
1139 if (!pde)
1140 return -ENOMEM;
1141#endif
1142
1143 return 0;
1144}
1145
1146static __net_exit void pppoe_exit_net(struct net *net)
1147{
1148 proc_net_remove(net, "pppoe");
1149}
1150
1151static struct pernet_operations pppoe_net_ops = {
1152 .init = pppoe_init_net,
1153 .exit = pppoe_exit_net,
1154 .id = &pppoe_net_id,
1155 .size = sizeof(struct pppoe_net),
1156};
1157
1158static int __init pppoe_init(void)
1159{
1160 int err;
1161
1162 err = register_pernet_device(&pppoe_net_ops);
1163 if (err)
1164 goto out;
1165
1166 err = proto_register(&pppoe_sk_proto, 0);
1167 if (err)
1168 goto out_unregister_net_ops;
1169
1170 err = register_pppox_proto(PX_PROTO_OE, &pppoe_proto);
1171 if (err)
1172 goto out_unregister_pppoe_proto;
1173
1174 dev_add_pack(&pppoes_ptype);
1175 dev_add_pack(&pppoed_ptype);
1176 register_netdevice_notifier(&pppoe_notifier);
1177
1178 return 0;
1179
1180out_unregister_pppoe_proto:
1181 proto_unregister(&pppoe_sk_proto);
1182out_unregister_net_ops:
1183 unregister_pernet_device(&pppoe_net_ops);
1184out:
1185 return err;
1186}
1187
1188static void __exit pppoe_exit(void)
1189{
1190 unregister_netdevice_notifier(&pppoe_notifier);
1191 dev_remove_pack(&pppoed_ptype);
1192 dev_remove_pack(&pppoes_ptype);
1193 unregister_pppox_proto(PX_PROTO_OE);
1194 proto_unregister(&pppoe_sk_proto);
1195 unregister_pernet_device(&pppoe_net_ops);
1196}
1197
1198module_init(pppoe_init);
1199module_exit(pppoe_exit);
1200
1201MODULE_AUTHOR("Michal Ostrowski <mostrows@speakeasy.net>");
1202MODULE_DESCRIPTION("PPP over Ethernet driver");
1203MODULE_LICENSE("GPL");
1204MODULE_ALIAS_NETPROTO(PF_PPPOX);
1205