1 /** -*- linux-c -*- ***********************************************************
2 * Linux PPP over Ethernet (PPPoX/PPPoE) Sockets
4 * PPPoX --- Generic PPP encapsulation socket family
5 * PPPoE --- PPP over Ethernet (RFC 2516)
10 * 070228 : Fix to allow multiple sessions with same remote MAC and same
11 * session id by including the local device ifindex in the
12 * tuple identifying a session. This also ensures packets can't
13 * be injected into a session from interfaces other than the one
14 * specified by userspace. Florian Zumbiehl <florz@florz.de>
15 * (Oh, BTW, this one is YYMMDD, in case you were wondering ...)
16 * 220102 : Fix module use count on failure in pppoe_create, pppox_sk -acme
17 * 030700 : Fixed connect logic to allow for disconnect.
18 * 270700 : Fixed potential SMP problems; we must protect against
19 * simultaneous invocation of ppp_input
20 * and ppp_unregister_channel.
21 * 040800 : Respect reference count mechanisms on net-devices.
22 * 200800 : fix kfree(skb) in pppoe_rcv (acme)
23 * Module reference count is decremented in the right spot now,
24 * guards against sock_put not actually freeing the sk
26 * 051000 : Initialization cleanup.
27 * 111100 : Fix recvmsg.
28 * 050101 : Fix PADT procesing.
29 * 140501 : Use pppoe_rcv_core to handle all backlog. (Alexey)
30 * 170701 : Do not lock_sock with rwlock held. (DaveM)
31 * Ignore discovery frames if user has socket
33 * Ignore return value of dev_queue_xmit in __pppoe_xmit
34 * or else we may kfree an SKB twice. (DaveM)
35 * 190701 : When doing copies of skb's in __pppoe_xmit, always delete
36 * the original skb that was passed in on success, never on
37 * failure. Delete the copy of the skb on failure to avoid
39 * 081001 : Misc. cleanup (licence string, non-blocking, prevent
40 * reference of device on close).
41 * 121301 : New ppp channels interface; cannot unregister a channel
42 * from interrupts. Thus, we mark the socket as a ZOMBIE
43 * and do the unregistration later.
44 * 081002 : seq_file support for proc stuff -acme
45 * 111602 : Merge all 2.4 fixes into 2.5/2.6 tree. Label 2.5/2.6
46 * as version 0.7. Spacing cleanup.
47 * Author: Michal Ostrowski <mostrows@speakeasy.net>
49 * Arnaldo Carvalho de Melo <acme@conectiva.com.br>
50 * David S. Miller (davem@redhat.com)
53 * This program is free software; you can redistribute it and/or
54 * modify it under the terms of the GNU General Public License
55 * as published by the Free Software Foundation; either version
56 * 2 of the License, or (at your option) any later version.
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/if_ppp.h>
76 #include <linux/notifier.h>
77 #include <linux/file.h>
78 #include <linux/proc_fs.h>
79 #include <linux/seq_file.h>
81 #include <linux/nsproxy.h>
82 #include <net/net_namespace.h>
83 #include <net/netns/generic.h>
86 #include <asm/uaccess.h>
88 #define PPPOE_HASH_BITS 4
89 #define PPPOE_HASH_SIZE (1 << PPPOE_HASH_BITS)
90 #define PPPOE_HASH_MASK (PPPOE_HASH_SIZE - 1)
92 static int pppoe_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg);
93 static int pppoe_xmit(struct ppp_channel *chan, struct sk_buff *skb);
94 static int __pppoe_xmit(struct sock *sk, struct sk_buff *skb);
96 static const struct proto_ops pppoe_ops;
97 static struct ppp_channel_ops pppoe_chan_ops;
99 /* per-net private data for this module */
100 static int pppoe_net_id;
103 * we could use _single_ hash table for all
104 * nets by injecting net id into the hash but
105 * it would increase hash chains and add
106 * a few additional math comparations messy
107 * as well, moreover in case of SMP less locking
110 struct pppox_sock *hash_table[PPPOE_HASH_SIZE];
115 * PPPoE could be in the following stages:
116 * 1) Discovery stage (to obtain remote MAC and Session ID)
117 * 2) Session stage (MAC and SID are known)
119 * Ethernet frames have a special tag for this but
120 * we use simplier approach based on session id
122 static inline bool stage_session(__be16 sid)
127 static inline struct pppoe_net *pppoe_pernet(struct net *net)
131 return net_generic(net, pppoe_net_id);
134 static inline int cmp_2_addr(struct pppoe_addr *a, struct pppoe_addr *b)
136 return a->sid == b->sid && !memcmp(a->remote, b->remote, ETH_ALEN);
139 static inline int cmp_addr(struct pppoe_addr *a, __be16 sid, char *addr)
141 return a->sid == sid && !memcmp(a->remote, addr, ETH_ALEN);
144 #if 8 % PPPOE_HASH_BITS
145 #error 8 must be a multiple of PPPOE_HASH_BITS
148 static int hash_item(__be16 sid, unsigned char *addr)
150 unsigned char hash = 0;
153 for (i = 0; i < ETH_ALEN; i++)
155 for (i = 0; i < sizeof(sid_t) * 8; i += 8)
156 hash ^= (__force __u32)sid >> i;
157 for (i = 8; (i >>= 1) >= PPPOE_HASH_BITS;)
160 return hash & PPPOE_HASH_MASK;
163 /**********************************************************************
165 * Set/get/delete/rehash items (internal versions)
167 **********************************************************************/
168 static struct pppox_sock *__get_item(struct pppoe_net *pn, __be16 sid,
169 unsigned char *addr, int ifindex)
171 int hash = hash_item(sid, addr);
172 struct pppox_sock *ret;
174 ret = pn->hash_table[hash];
176 if (cmp_addr(&ret->pppoe_pa, sid, addr) &&
177 ret->pppoe_ifindex == ifindex)
186 static int __set_item(struct pppoe_net *pn, struct pppox_sock *po)
188 int hash = hash_item(po->pppoe_pa.sid, po->pppoe_pa.remote);
189 struct pppox_sock *ret;
191 ret = pn->hash_table[hash];
193 if (cmp_2_addr(&ret->pppoe_pa, &po->pppoe_pa) &&
194 ret->pppoe_ifindex == po->pppoe_ifindex)
200 po->next = pn->hash_table[hash];
201 pn->hash_table[hash] = po;
206 static struct pppox_sock *__delete_item(struct pppoe_net *pn, __be16 sid,
207 char *addr, int ifindex)
209 int hash = hash_item(sid, addr);
210 struct pppox_sock *ret, **src;
212 ret = pn->hash_table[hash];
213 src = &pn->hash_table[hash];
216 if (cmp_addr(&ret->pppoe_pa, sid, addr) &&
217 ret->pppoe_ifindex == ifindex) {
229 /**********************************************************************
231 * Set/get/delete/rehash items
233 **********************************************************************/
234 static inline struct pppox_sock *get_item(struct pppoe_net *pn, __be16 sid,
235 unsigned char *addr, int ifindex)
237 struct pppox_sock *po;
239 read_lock_bh(&pn->hash_lock);
240 po = __get_item(pn, sid, addr, ifindex);
242 sock_hold(sk_pppox(po));
243 read_unlock_bh(&pn->hash_lock);
248 static inline struct pppox_sock *get_item_by_addr(struct net *net,
249 struct sockaddr_pppox *sp)
251 struct net_device *dev;
252 struct pppoe_net *pn;
253 struct pppox_sock *pppox_sock;
257 dev = dev_get_by_name(net, sp->sa_addr.pppoe.dev);
261 ifindex = dev->ifindex;
262 pn = net_generic(net, pppoe_net_id);
263 pppox_sock = get_item(pn, sp->sa_addr.pppoe.sid,
264 sp->sa_addr.pppoe.remote, ifindex);
270 static inline struct pppox_sock *delete_item(struct pppoe_net *pn, __be16 sid,
271 char *addr, int ifindex)
273 struct pppox_sock *ret;
275 write_lock_bh(&pn->hash_lock);
276 ret = __delete_item(pn, sid, addr, ifindex);
277 write_unlock_bh(&pn->hash_lock);
282 /***************************************************************************
284 * Handler for device events.
285 * Certain device events require that sockets be unconnected.
287 **************************************************************************/
289 static void pppoe_flush_dev(struct net_device *dev)
291 struct pppoe_net *pn;
296 pn = pppoe_pernet(dev_net(dev));
297 if (!pn) /* already freed */
300 write_lock_bh(&pn->hash_lock);
301 for (i = 0; i < PPPOE_HASH_SIZE; i++) {
302 struct pppox_sock *po = pn->hash_table[i];
306 while (po && po->pppoe_dev != dev) {
315 /* We always grab the socket lock, followed by the
316 * hash_lock, in that order. Since we should hold the
317 * sock lock while doing any unbinding, we need to
318 * release the lock we're holding. Hold a reference to
319 * the sock so it doesn't disappear as we're jumping
324 write_unlock_bh(&pn->hash_lock);
327 if (po->pppoe_dev == dev
328 && sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND)) {
329 pppox_unbind_sock(sk);
330 sk->sk_state = PPPOX_ZOMBIE;
331 sk->sk_state_change(sk);
332 po->pppoe_dev = NULL;
339 /* Restart the process from the start of the current
340 * hash chain. We dropped locks so the world may have
341 * change from underneath us.
344 BUG_ON(pppoe_pernet(dev_net(dev)) == NULL);
345 write_lock_bh(&pn->hash_lock);
346 po = pn->hash_table[i];
349 write_unlock_bh(&pn->hash_lock);
352 static int pppoe_device_event(struct notifier_block *this,
353 unsigned long event, void *ptr)
355 struct net_device *dev = (struct net_device *)ptr;
357 /* Only look at sockets that are using this specific device. */
359 case NETDEV_CHANGEMTU:
360 /* A change in mtu is a bad thing, requiring
361 * LCP re-negotiation.
364 case NETDEV_GOING_DOWN:
366 /* Find every socket on this device and kill it. */
367 pppoe_flush_dev(dev);
377 static struct notifier_block pppoe_notifier = {
378 .notifier_call = pppoe_device_event,
381 /************************************************************************
383 * Do the real work of receiving a PPPoE Session frame.
385 ***********************************************************************/
386 static int pppoe_rcv_core(struct sock *sk, struct sk_buff *skb)
388 struct pppox_sock *po = pppox_sk(sk);
389 struct pppox_sock *relay_po;
391 /* Backlog receive. Semantics of backlog rcv preclude any code from
392 * executing in lock_sock()/release_sock() bounds; meaning sk->sk_state
396 if (sk->sk_state & PPPOX_BOUND) {
397 ppp_input(&po->chan, skb);
398 } else if (sk->sk_state & PPPOX_RELAY) {
399 relay_po = get_item_by_addr(sock_net(sk),
401 if (relay_po == NULL)
404 if ((sk_pppox(relay_po)->sk_state & PPPOX_CONNECTED) == 0)
407 if (!__pppoe_xmit(sk_pppox(relay_po), skb))
410 if (sock_queue_rcv_skb(sk, skb))
414 return NET_RX_SUCCESS;
417 sock_put(sk_pppox(relay_po));
424 /************************************************************************
426 * Receive wrapper called in BH context.
428 ***********************************************************************/
429 static int pppoe_rcv(struct sk_buff *skb, struct net_device *dev,
430 struct packet_type *pt, struct net_device *orig_dev)
432 struct pppoe_hdr *ph;
433 struct pppox_sock *po;
434 struct pppoe_net *pn;
437 skb = skb_share_check(skb, GFP_ATOMIC);
441 if (!pskb_may_pull(skb, sizeof(struct pppoe_hdr)))
445 len = ntohs(ph->length);
447 skb_pull_rcsum(skb, sizeof(*ph));
451 if (pskb_trim_rcsum(skb, len))
454 pn = pppoe_pernet(dev_net(dev));
456 /* Note that get_item does a sock_hold(), so sk_pppox(po)
457 * is known to be safe.
459 po = get_item(pn, ph->sid, eth_hdr(skb)->h_source, dev->ifindex);
463 return sk_receive_skb(sk_pppox(po), skb, 0);
471 /************************************************************************
473 * Receive a PPPoE Discovery frame.
474 * This is solely for detection of PADT frames
476 ***********************************************************************/
477 static int pppoe_disc_rcv(struct sk_buff *skb, struct net_device *dev,
478 struct packet_type *pt, struct net_device *orig_dev)
481 struct pppoe_hdr *ph;
482 struct pppox_sock *po;
483 struct pppoe_net *pn;
485 skb = skb_share_check(skb, GFP_ATOMIC);
489 if (!pskb_may_pull(skb, sizeof(struct pppoe_hdr)))
493 if (ph->code != PADT_CODE)
496 pn = pppoe_pernet(dev_net(dev));
497 po = get_item(pn, ph->sid, eth_hdr(skb)->h_source, dev->ifindex);
499 struct sock *sk = sk_pppox(po);
503 /* If the user has locked the socket, just ignore
504 * the packet. With the way two rcv protocols hook into
505 * one socket family type, we cannot (easily) distinguish
506 * what kind of SKB it is during backlog rcv.
508 if (sock_owned_by_user(sk) == 0) {
509 /* We're no longer connect at the PPPOE layer,
510 * and must wait for ppp channel to disconnect us.
512 sk->sk_state = PPPOX_ZOMBIE;
522 return NET_RX_SUCCESS; /* Lies... :-) */
525 static struct packet_type pppoes_ptype __read_mostly = {
526 .type = cpu_to_be16(ETH_P_PPP_SES),
530 static struct packet_type pppoed_ptype __read_mostly = {
531 .type = cpu_to_be16(ETH_P_PPP_DISC),
532 .func = pppoe_disc_rcv,
535 static struct proto pppoe_sk_proto __read_mostly = {
537 .owner = THIS_MODULE,
538 .obj_size = sizeof(struct pppox_sock),
541 /***********************************************************************
543 * Initialize a new struct sock.
545 **********************************************************************/
546 static int pppoe_create(struct net *net, struct socket *sock)
550 sk = sk_alloc(net, PF_PPPOX, GFP_KERNEL, &pppoe_sk_proto);
554 sock_init_data(sock, sk);
556 sock->state = SS_UNCONNECTED;
557 sock->ops = &pppoe_ops;
559 sk->sk_backlog_rcv = pppoe_rcv_core;
560 sk->sk_state = PPPOX_NONE;
561 sk->sk_type = SOCK_STREAM;
562 sk->sk_family = PF_PPPOX;
563 sk->sk_protocol = PX_PROTO_OE;
568 static int pppoe_release(struct socket *sock)
570 struct sock *sk = sock->sk;
571 struct pppox_sock *po;
572 struct pppoe_net *pn;
573 struct net *net = NULL;
579 if (sock_flag(sk, SOCK_DEAD)) {
586 if (sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND)) {
587 dev_put(po->pppoe_dev);
588 po->pppoe_dev = NULL;
591 pppox_unbind_sock(sk);
593 /* Signal the death of the socket. */
594 sk->sk_state = PPPOX_DEAD;
597 pn = pppoe_pernet(net);
600 * protect "po" from concurrent updates
603 delete_item(pn, po->pppoe_pa.sid, po->pppoe_pa.remote,
609 skb_queue_purge(&sk->sk_receive_queue);
616 static int pppoe_connect(struct socket *sock, struct sockaddr *uservaddr,
617 int sockaddr_len, int flags)
619 struct sock *sk = sock->sk;
620 struct sockaddr_pppox *sp = (struct sockaddr_pppox *)uservaddr;
621 struct pppox_sock *po = pppox_sk(sk);
622 struct net_device *dev = NULL;
623 struct pppoe_net *pn;
624 struct net *net = NULL;
630 if (sp->sa_protocol != PX_PROTO_OE)
633 /* Check for already bound sockets */
635 if ((sk->sk_state & PPPOX_CONNECTED) &&
636 stage_session(sp->sa_addr.pppoe.sid))
639 /* Check for already disconnected sockets, on attempts to disconnect */
641 if ((sk->sk_state & PPPOX_DEAD) &&
642 !stage_session(sp->sa_addr.pppoe.sid))
647 /* Delete the old binding */
648 if (stage_session(po->pppoe_pa.sid)) {
649 pppox_unbind_sock(sk);
650 pn = pppoe_pernet(sock_net(sk));
651 delete_item(pn, po->pppoe_pa.sid,
652 po->pppoe_pa.remote, po->pppoe_ifindex);
654 dev_put(po->pppoe_dev);
655 po->pppoe_dev = NULL;
658 memset(sk_pppox(po) + 1, 0,
659 sizeof(struct pppox_sock) - sizeof(struct sock));
660 sk->sk_state = PPPOX_NONE;
663 /* Re-bind in session stage only */
664 if (stage_session(sp->sa_addr.pppoe.sid)) {
667 dev = dev_get_by_name(net, sp->sa_addr.pppoe.dev);
672 po->pppoe_ifindex = dev->ifindex;
673 pn = pppoe_pernet(net);
674 if (!(dev->flags & IFF_UP)) {
678 memcpy(&po->pppoe_pa,
680 sizeof(struct pppoe_addr));
682 write_lock_bh(&pn->hash_lock);
683 error = __set_item(pn, po);
684 write_unlock_bh(&pn->hash_lock);
688 po->chan.hdrlen = (sizeof(struct pppoe_hdr) +
689 dev->hard_header_len);
691 po->chan.mtu = dev->mtu - sizeof(struct pppoe_hdr);
692 po->chan.private = sk;
693 po->chan.ops = &pppoe_chan_ops;
695 error = ppp_register_net_channel(dev_net(dev), &po->chan);
697 delete_item(pn, po->pppoe_pa.sid,
698 po->pppoe_pa.remote, po->pppoe_ifindex);
702 sk->sk_state = PPPOX_CONNECTED;
705 po->num = sp->sa_addr.pppoe.sid;
712 dev_put(po->pppoe_dev);
713 po->pppoe_dev = NULL;
718 static int pppoe_getname(struct socket *sock, struct sockaddr *uaddr,
719 int *usockaddr_len, int peer)
721 int len = sizeof(struct sockaddr_pppox);
722 struct sockaddr_pppox sp;
724 sp.sa_family = AF_PPPOX;
725 sp.sa_protocol = PX_PROTO_OE;
726 memcpy(&sp.sa_addr.pppoe, &pppox_sk(sock->sk)->pppoe_pa,
727 sizeof(struct pppoe_addr));
729 memcpy(uaddr, &sp, len);
731 *usockaddr_len = len;
736 static int pppoe_ioctl(struct socket *sock, unsigned int cmd,
739 struct sock *sk = sock->sk;
740 struct pppox_sock *po = pppox_sk(sk);
747 if (!(sk->sk_state & PPPOX_CONNECTED))
751 if (put_user(po->pppoe_dev->mtu -
752 sizeof(struct pppoe_hdr) -
761 if (!(sk->sk_state & PPPOX_CONNECTED))
765 if (get_user(val, (int __user *)arg))
768 if (val < (po->pppoe_dev->mtu
769 - sizeof(struct pppoe_hdr)
778 if (get_user(val, (int __user *)arg))
785 struct pppox_sock *relay_po;
788 if (sk->sk_state & (PPPOX_BOUND | PPPOX_ZOMBIE | PPPOX_DEAD))
792 if (!(sk->sk_state & PPPOX_CONNECTED))
795 /* PPPoE address from the user specifies an outbound
796 PPPoE address which frames are forwarded to */
798 if (copy_from_user(&po->pppoe_relay,
800 sizeof(struct sockaddr_pppox)))
804 if (po->pppoe_relay.sa_family != AF_PPPOX ||
805 po->pppoe_relay.sa_protocol != PX_PROTO_OE)
808 /* Check that the socket referenced by the address
810 relay_po = get_item_by_addr(sock_net(sk), &po->pppoe_relay);
814 sock_put(sk_pppox(relay_po));
815 sk->sk_state |= PPPOX_RELAY;
822 if (!(sk->sk_state & PPPOX_RELAY))
825 sk->sk_state &= ~PPPOX_RELAY;
836 static int pppoe_sendmsg(struct kiocb *iocb, struct socket *sock,
837 struct msghdr *m, size_t total_len)
840 struct sock *sk = sock->sk;
841 struct pppox_sock *po = pppox_sk(sk);
843 struct pppoe_hdr hdr;
844 struct pppoe_hdr *ph;
845 struct net_device *dev;
849 if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED)) {
862 if (total_len > (dev->mtu + dev->hard_header_len))
866 skb = sock_wmalloc(sk, total_len + dev->hard_header_len + 32,
873 /* Reserve space for headers. */
874 skb_reserve(skb, dev->hard_header_len);
875 skb_reset_network_header(skb);
879 skb->priority = sk->sk_priority;
880 skb->protocol = cpu_to_be16(ETH_P_PPP_SES);
882 ph = (struct pppoe_hdr *)skb_put(skb, total_len + sizeof(struct pppoe_hdr));
883 start = (char *)&ph->tag[0];
885 error = memcpy_fromiovec(start, m->msg_iov, total_len);
892 dev_hard_header(skb, dev, ETH_P_PPP_SES,
893 po->pppoe_pa.remote, NULL, total_len);
895 memcpy(ph, &hdr, sizeof(struct pppoe_hdr));
897 ph->length = htons(total_len);
906 /************************************************************************
908 * xmit function for internal use.
910 ***********************************************************************/
911 static int __pppoe_xmit(struct sock *sk, struct sk_buff *skb)
913 struct pppox_sock *po = pppox_sk(sk);
914 struct net_device *dev = po->pppoe_dev;
915 struct pppoe_hdr *ph;
916 int data_len = skb->len;
918 /* The higher-level PPP code (ppp_unregister_channel()) ensures the PPP
919 * xmit operations conclude prior to an unregistration call. Thus
920 * sk->sk_state cannot change, so we don't need to do lock_sock().
921 * But, we also can't do a lock_sock since that introduces a potential
922 * deadlock as we'd reverse the lock ordering used when calling
923 * ppp_unregister_channel().
926 if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED))
932 /* Copy the data if there is no space for the header or if it's
935 if (skb_cow_head(skb, sizeof(*ph) + dev->hard_header_len))
938 __skb_push(skb, sizeof(*ph));
939 skb_reset_network_header(skb);
946 ph->length = htons(data_len);
948 skb->protocol = cpu_to_be16(ETH_P_PPP_SES);
951 dev_hard_header(skb, dev, ETH_P_PPP_SES,
952 po->pppoe_pa.remote, NULL, data_len);
962 /************************************************************************
964 * xmit function called by generic PPP driver
965 * sends PPP frame over PPPoE socket
967 ***********************************************************************/
968 static int pppoe_xmit(struct ppp_channel *chan, struct sk_buff *skb)
970 struct sock *sk = (struct sock *)chan->private;
971 return __pppoe_xmit(sk, skb);
974 static struct ppp_channel_ops pppoe_chan_ops = {
975 .start_xmit = pppoe_xmit,
978 static int pppoe_recvmsg(struct kiocb *iocb, struct socket *sock,
979 struct msghdr *m, size_t total_len, int flags)
981 struct sock *sk = sock->sk;
985 if (sk->sk_state & PPPOX_BOUND) {
990 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
991 flags & MSG_DONTWAIT, &error);
998 total_len = min_t(size_t, total_len, skb->len);
999 error = skb_copy_datagram_iovec(skb, 0, m->msg_iov, total_len);
1009 #ifdef CONFIG_PROC_FS
1010 static int pppoe_seq_show(struct seq_file *seq, void *v)
1012 struct pppox_sock *po;
1015 if (v == SEQ_START_TOKEN) {
1016 seq_puts(seq, "Id Address Device\n");
1021 dev_name = po->pppoe_pa.dev;
1023 seq_printf(seq, "%08X %pM %8s\n",
1024 po->pppoe_pa.sid, po->pppoe_pa.remote, dev_name);
1029 static inline struct pppox_sock *pppoe_get_idx(struct pppoe_net *pn, loff_t pos)
1031 struct pppox_sock *po;
1034 for (i = 0; i < PPPOE_HASH_SIZE; i++) {
1035 po = pn->hash_table[i];
1047 static void *pppoe_seq_start(struct seq_file *seq, loff_t *pos)
1048 __acquires(pn->hash_lock)
1050 struct pppoe_net *pn = pppoe_pernet(seq_file_net(seq));
1053 read_lock_bh(&pn->hash_lock);
1054 return l ? pppoe_get_idx(pn, --l) : SEQ_START_TOKEN;
1057 static void *pppoe_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1059 struct pppoe_net *pn = pppoe_pernet(seq_file_net(seq));
1060 struct pppox_sock *po;
1063 if (v == SEQ_START_TOKEN) {
1064 po = pppoe_get_idx(pn, 0);
1071 int hash = hash_item(po->pppoe_pa.sid, po->pppoe_pa.remote);
1074 while (++hash < PPPOE_HASH_SIZE) {
1075 po = pn->hash_table[hash];
1085 static void pppoe_seq_stop(struct seq_file *seq, void *v)
1086 __releases(pn->hash_lock)
1088 struct pppoe_net *pn = pppoe_pernet(seq_file_net(seq));
1089 read_unlock_bh(&pn->hash_lock);
1092 static const struct seq_operations pppoe_seq_ops = {
1093 .start = pppoe_seq_start,
1094 .next = pppoe_seq_next,
1095 .stop = pppoe_seq_stop,
1096 .show = pppoe_seq_show,
1099 static int pppoe_seq_open(struct inode *inode, struct file *file)
1101 return seq_open_net(inode, file, &pppoe_seq_ops,
1102 sizeof(struct seq_net_private));
1105 static const struct file_operations pppoe_seq_fops = {
1106 .owner = THIS_MODULE,
1107 .open = pppoe_seq_open,
1109 .llseek = seq_lseek,
1110 .release = seq_release_net,
1113 #endif /* CONFIG_PROC_FS */
1115 static const struct proto_ops pppoe_ops = {
1117 .owner = THIS_MODULE,
1118 .release = pppoe_release,
1119 .bind = sock_no_bind,
1120 .connect = pppoe_connect,
1121 .socketpair = sock_no_socketpair,
1122 .accept = sock_no_accept,
1123 .getname = pppoe_getname,
1124 .poll = datagram_poll,
1125 .listen = sock_no_listen,
1126 .shutdown = sock_no_shutdown,
1127 .setsockopt = sock_no_setsockopt,
1128 .getsockopt = sock_no_getsockopt,
1129 .sendmsg = pppoe_sendmsg,
1130 .recvmsg = pppoe_recvmsg,
1131 .mmap = sock_no_mmap,
1132 .ioctl = pppox_ioctl,
1135 static struct pppox_proto pppoe_proto = {
1136 .create = pppoe_create,
1137 .ioctl = pppoe_ioctl,
1138 .owner = THIS_MODULE,
1141 static __net_init int pppoe_init_net(struct net *net)
1143 struct pppoe_net *pn;
1144 struct proc_dir_entry *pde;
1147 pn = kzalloc(sizeof(*pn), GFP_KERNEL);
1151 rwlock_init(&pn->hash_lock);
1153 err = net_assign_generic(net, pppoe_net_id, pn);
1157 pde = proc_net_fops_create(net, "pppoe", S_IRUGO, &pppoe_seq_fops);
1158 #ifdef CONFIG_PROC_FS
1172 static __net_exit void pppoe_exit_net(struct net *net)
1174 struct pppoe_net *pn;
1176 proc_net_remove(net, "pppoe");
1177 pn = net_generic(net, pppoe_net_id);
1179 * if someone has cached our net then
1180 * further net_generic call will return NULL
1182 net_assign_generic(net, pppoe_net_id, NULL);
1186 static struct pernet_operations pppoe_net_ops = {
1187 .init = pppoe_init_net,
1188 .exit = pppoe_exit_net,
1191 static int __init pppoe_init(void)
1195 err = register_pernet_gen_device(&pppoe_net_id, &pppoe_net_ops);
1199 err = proto_register(&pppoe_sk_proto, 0);
1201 goto out_unregister_net_ops;
1203 err = register_pppox_proto(PX_PROTO_OE, &pppoe_proto);
1205 goto out_unregister_pppoe_proto;
1207 dev_add_pack(&pppoes_ptype);
1208 dev_add_pack(&pppoed_ptype);
1209 register_netdevice_notifier(&pppoe_notifier);
1213 out_unregister_pppoe_proto:
1214 proto_unregister(&pppoe_sk_proto);
1215 out_unregister_net_ops:
1216 unregister_pernet_gen_device(pppoe_net_id, &pppoe_net_ops);
1221 static void __exit pppoe_exit(void)
1223 unregister_netdevice_notifier(&pppoe_notifier);
1224 dev_remove_pack(&pppoed_ptype);
1225 dev_remove_pack(&pppoes_ptype);
1226 unregister_pppox_proto(PX_PROTO_OE);
1227 proto_unregister(&pppoe_sk_proto);
1228 unregister_pernet_gen_device(pppoe_net_id, &pppoe_net_ops);
1231 module_init(pppoe_init);
1232 module_exit(pppoe_exit);
1234 MODULE_AUTHOR("Michal Ostrowski <mostrows@speakeasy.net>");
1235 MODULE_DESCRIPTION("PPP over Ethernet driver");
1236 MODULE_LICENSE("GPL");
1237 MODULE_ALIAS_NETPROTO(PF_PPPOX);