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/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>
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_xmit(struct sock *sk, struct sk_buff *skb);
94 static const struct proto_ops pppoe_ops;
95 static const struct ppp_channel_ops pppoe_chan_ops;
97 /* per-net private data for this module */
98 static int pppoe_net_id __read_mostly;
101 * we could use _single_ hash table for all
102 * nets by injecting net id into the hash but
103 * it would increase hash chains and add
104 * a few additional math comparations messy
105 * as well, moreover in case of SMP less locking
108 struct pppox_sock *hash_table[PPPOE_HASH_SIZE];
113 * PPPoE could be in the following stages:
114 * 1) Discovery stage (to obtain remote MAC and Session ID)
115 * 2) Session stage (MAC and SID are known)
117 * Ethernet frames have a special tag for this but
118 * we use simpler approach based on session id
120 static inline bool stage_session(__be16 sid)
125 static inline struct pppoe_net *pppoe_pernet(struct net *net)
129 return net_generic(net, pppoe_net_id);
132 static inline int cmp_2_addr(struct pppoe_addr *a, struct pppoe_addr *b)
134 return a->sid == b->sid && ether_addr_equal(a->remote, b->remote);
137 static inline int cmp_addr(struct pppoe_addr *a, __be16 sid, char *addr)
139 return a->sid == sid && ether_addr_equal(a->remote, addr);
142 #if 8 % PPPOE_HASH_BITS
143 #error 8 must be a multiple of PPPOE_HASH_BITS
146 static int hash_item(__be16 sid, unsigned char *addr)
148 unsigned char hash = 0;
151 for (i = 0; i < ETH_ALEN; 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;)
158 return hash & PPPOE_HASH_MASK;
161 /**********************************************************************
163 * Set/get/delete/rehash items (internal versions)
165 **********************************************************************/
166 static struct pppox_sock *__get_item(struct pppoe_net *pn, __be16 sid,
167 unsigned char *addr, int ifindex)
169 int hash = hash_item(sid, addr);
170 struct pppox_sock *ret;
172 ret = pn->hash_table[hash];
174 if (cmp_addr(&ret->pppoe_pa, sid, addr) &&
175 ret->pppoe_ifindex == ifindex)
184 static int __set_item(struct pppoe_net *pn, struct pppox_sock *po)
186 int hash = hash_item(po->pppoe_pa.sid, po->pppoe_pa.remote);
187 struct pppox_sock *ret;
189 ret = pn->hash_table[hash];
191 if (cmp_2_addr(&ret->pppoe_pa, &po->pppoe_pa) &&
192 ret->pppoe_ifindex == po->pppoe_ifindex)
198 po->next = pn->hash_table[hash];
199 pn->hash_table[hash] = po;
204 static void __delete_item(struct pppoe_net *pn, __be16 sid,
205 char *addr, int ifindex)
207 int hash = hash_item(sid, addr);
208 struct pppox_sock *ret, **src;
210 ret = pn->hash_table[hash];
211 src = &pn->hash_table[hash];
214 if (cmp_addr(&ret->pppoe_pa, sid, addr) &&
215 ret->pppoe_ifindex == ifindex) {
225 /**********************************************************************
227 * Set/get/delete/rehash items
229 **********************************************************************/
230 static inline struct pppox_sock *get_item(struct pppoe_net *pn, __be16 sid,
231 unsigned char *addr, int ifindex)
233 struct pppox_sock *po;
235 read_lock_bh(&pn->hash_lock);
236 po = __get_item(pn, sid, addr, ifindex);
238 sock_hold(sk_pppox(po));
239 read_unlock_bh(&pn->hash_lock);
244 static inline struct pppox_sock *get_item_by_addr(struct net *net,
245 struct sockaddr_pppox *sp)
247 struct net_device *dev;
248 struct pppoe_net *pn;
249 struct pppox_sock *pppox_sock = NULL;
254 dev = dev_get_by_name_rcu(net, sp->sa_addr.pppoe.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);
265 static inline void delete_item(struct pppoe_net *pn, __be16 sid,
266 char *addr, int ifindex)
268 write_lock_bh(&pn->hash_lock);
269 __delete_item(pn, sid, addr, ifindex);
270 write_unlock_bh(&pn->hash_lock);
273 /***************************************************************************
275 * Handler for device events.
276 * Certain device events require that sockets be unconnected.
278 **************************************************************************/
280 static void pppoe_flush_dev(struct net_device *dev)
282 struct pppoe_net *pn;
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];
292 while (po && po->pppoe_dev != dev) {
301 /* We always grab the socket lock, followed by the
302 * hash_lock, in that order. Since we should hold the
303 * sock lock while doing any unbinding, we need to
304 * release the lock we're holding. Hold a reference to
305 * the sock so it doesn't disappear as we're jumping
310 write_unlock_bh(&pn->hash_lock);
313 if (po->pppoe_dev == dev &&
314 sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND)) {
315 pppox_unbind_sock(sk);
316 sk->sk_state_change(sk);
317 po->pppoe_dev = NULL;
324 /* Restart the process from the start of the current
325 * hash chain. We dropped locks so the world may have
326 * change from underneath us.
329 BUG_ON(pppoe_pernet(dev_net(dev)) == NULL);
330 write_lock_bh(&pn->hash_lock);
331 po = pn->hash_table[i];
334 write_unlock_bh(&pn->hash_lock);
337 static int pppoe_device_event(struct notifier_block *this,
338 unsigned long event, void *ptr)
340 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
342 /* Only look at sockets that are using this specific device. */
344 case NETDEV_CHANGEADDR:
345 case NETDEV_CHANGEMTU:
346 /* A change in mtu or address is a bad thing, requiring
347 * LCP re-negotiation.
350 case NETDEV_GOING_DOWN:
352 /* Find every socket on this device and kill it. */
353 pppoe_flush_dev(dev);
363 static struct notifier_block pppoe_notifier = {
364 .notifier_call = pppoe_device_event,
367 /************************************************************************
369 * Do the real work of receiving a PPPoE Session frame.
371 ***********************************************************************/
372 static int pppoe_rcv_core(struct sock *sk, struct sk_buff *skb)
374 struct pppox_sock *po = pppox_sk(sk);
375 struct pppox_sock *relay_po;
377 /* Backlog receive. Semantics of backlog rcv preclude any code from
378 * executing in lock_sock()/release_sock() bounds; meaning sk->sk_state
382 if (skb->pkt_type == PACKET_OTHERHOST)
385 if (sk->sk_state & PPPOX_BOUND) {
386 ppp_input(&po->chan, skb);
387 } else if (sk->sk_state & PPPOX_RELAY) {
388 relay_po = get_item_by_addr(sock_net(sk),
390 if (relay_po == NULL)
393 if ((sk_pppox(relay_po)->sk_state & PPPOX_CONNECTED) == 0)
396 if (!__pppoe_xmit(sk_pppox(relay_po), skb))
399 if (sock_queue_rcv_skb(sk, skb))
403 return NET_RX_SUCCESS;
406 sock_put(sk_pppox(relay_po));
413 /************************************************************************
415 * Receive wrapper called in BH context.
417 ***********************************************************************/
418 static int pppoe_rcv(struct sk_buff *skb, struct net_device *dev,
419 struct packet_type *pt, struct net_device *orig_dev)
421 struct pppoe_hdr *ph;
422 struct pppox_sock *po;
423 struct pppoe_net *pn;
426 skb = skb_share_check(skb, GFP_ATOMIC);
430 if (!pskb_may_pull(skb, sizeof(struct pppoe_hdr)))
434 len = ntohs(ph->length);
436 skb_pull_rcsum(skb, sizeof(*ph));
440 if (pskb_trim_rcsum(skb, len))
443 pn = pppoe_pernet(dev_net(dev));
445 /* Note that get_item does a sock_hold(), so sk_pppox(po)
446 * is known to be safe.
448 po = get_item(pn, ph->sid, eth_hdr(skb)->h_source, dev->ifindex);
452 return sk_receive_skb(sk_pppox(po), skb, 0);
460 static void pppoe_unbind_sock_work(struct work_struct *work)
462 struct pppox_sock *po = container_of(work, struct pppox_sock,
463 proto.pppoe.padt_work);
464 struct sock *sk = sk_pppox(po);
468 dev_put(po->pppoe_dev);
469 po->pppoe_dev = NULL;
471 pppox_unbind_sock(sk);
476 /************************************************************************
478 * Receive a PPPoE Discovery frame.
479 * This is solely for detection of PADT frames
481 ***********************************************************************/
482 static int pppoe_disc_rcv(struct sk_buff *skb, struct net_device *dev,
483 struct packet_type *pt, struct net_device *orig_dev)
486 struct pppoe_hdr *ph;
487 struct pppox_sock *po;
488 struct pppoe_net *pn;
490 skb = skb_share_check(skb, GFP_ATOMIC);
494 if (!pskb_may_pull(skb, sizeof(struct pppoe_hdr)))
498 if (ph->code != PADT_CODE)
501 pn = pppoe_pernet(dev_net(dev));
502 po = get_item(pn, ph->sid, eth_hdr(skb)->h_source, dev->ifindex);
504 if (!schedule_work(&po->proto.pppoe.padt_work))
505 sock_put(sk_pppox(po));
510 return NET_RX_SUCCESS; /* Lies... :-) */
513 static struct packet_type pppoes_ptype __read_mostly = {
514 .type = cpu_to_be16(ETH_P_PPP_SES),
518 static struct packet_type pppoed_ptype __read_mostly = {
519 .type = cpu_to_be16(ETH_P_PPP_DISC),
520 .func = pppoe_disc_rcv,
523 static struct proto pppoe_sk_proto __read_mostly = {
525 .owner = THIS_MODULE,
526 .obj_size = sizeof(struct pppox_sock),
529 /***********************************************************************
531 * Initialize a new struct sock.
533 **********************************************************************/
534 static int pppoe_create(struct net *net, struct socket *sock, int kern)
538 sk = sk_alloc(net, PF_PPPOX, GFP_KERNEL, &pppoe_sk_proto, kern);
542 sock_init_data(sock, sk);
544 sock->state = SS_UNCONNECTED;
545 sock->ops = &pppoe_ops;
547 sk->sk_backlog_rcv = pppoe_rcv_core;
548 sk->sk_state = PPPOX_NONE;
549 sk->sk_type = SOCK_STREAM;
550 sk->sk_family = PF_PPPOX;
551 sk->sk_protocol = PX_PROTO_OE;
556 static int pppoe_release(struct socket *sock)
558 struct sock *sk = sock->sk;
559 struct pppox_sock *po;
560 struct pppoe_net *pn;
561 struct net *net = NULL;
567 if (sock_flag(sk, SOCK_DEAD)) {
575 dev_put(po->pppoe_dev);
576 po->pppoe_dev = NULL;
579 pppox_unbind_sock(sk);
581 /* Signal the death of the socket. */
582 sk->sk_state = PPPOX_DEAD;
585 pn = pppoe_pernet(net);
588 * protect "po" from concurrent updates
591 delete_item(pn, po->pppoe_pa.sid, po->pppoe_pa.remote,
597 skb_queue_purge(&sk->sk_receive_queue);
604 static int pppoe_connect(struct socket *sock, struct sockaddr *uservaddr,
605 int sockaddr_len, int flags)
607 struct sock *sk = sock->sk;
608 struct sockaddr_pppox *sp = (struct sockaddr_pppox *)uservaddr;
609 struct pppox_sock *po = pppox_sk(sk);
610 struct net_device *dev = NULL;
611 struct pppoe_net *pn;
612 struct net *net = NULL;
617 INIT_WORK(&po->proto.pppoe.padt_work, pppoe_unbind_sock_work);
620 if (sp->sa_protocol != PX_PROTO_OE)
623 /* Check for already bound sockets */
625 if ((sk->sk_state & PPPOX_CONNECTED) &&
626 stage_session(sp->sa_addr.pppoe.sid))
629 /* Check for already disconnected sockets, on attempts to disconnect */
631 if ((sk->sk_state & PPPOX_DEAD) &&
632 !stage_session(sp->sa_addr.pppoe.sid))
637 /* Delete the old binding */
638 if (stage_session(po->pppoe_pa.sid)) {
639 pppox_unbind_sock(sk);
640 pn = pppoe_pernet(sock_net(sk));
641 delete_item(pn, po->pppoe_pa.sid,
642 po->pppoe_pa.remote, po->pppoe_ifindex);
644 dev_put(po->pppoe_dev);
645 po->pppoe_dev = NULL;
648 memset(sk_pppox(po) + 1, 0,
649 sizeof(struct pppox_sock) - sizeof(struct sock));
650 sk->sk_state = PPPOX_NONE;
653 /* Re-bind in session stage only */
654 if (stage_session(sp->sa_addr.pppoe.sid)) {
657 dev = dev_get_by_name(net, sp->sa_addr.pppoe.dev);
662 po->pppoe_ifindex = dev->ifindex;
663 pn = pppoe_pernet(net);
664 if (!(dev->flags & IFF_UP)) {
668 memcpy(&po->pppoe_pa,
670 sizeof(struct pppoe_addr));
672 write_lock_bh(&pn->hash_lock);
673 error = __set_item(pn, po);
674 write_unlock_bh(&pn->hash_lock);
678 po->chan.hdrlen = (sizeof(struct pppoe_hdr) +
679 dev->hard_header_len);
681 po->chan.mtu = dev->mtu - sizeof(struct pppoe_hdr) - 2;
682 po->chan.private = sk;
683 po->chan.ops = &pppoe_chan_ops;
685 error = ppp_register_net_channel(dev_net(dev), &po->chan);
687 delete_item(pn, po->pppoe_pa.sid,
688 po->pppoe_pa.remote, po->pppoe_ifindex);
692 sk->sk_state = PPPOX_CONNECTED;
695 po->num = sp->sa_addr.pppoe.sid;
702 dev_put(po->pppoe_dev);
703 po->pppoe_dev = NULL;
708 static int pppoe_getname(struct socket *sock, struct sockaddr *uaddr,
709 int *usockaddr_len, int peer)
711 int len = sizeof(struct sockaddr_pppox);
712 struct sockaddr_pppox sp;
714 sp.sa_family = AF_PPPOX;
715 sp.sa_protocol = PX_PROTO_OE;
716 memcpy(&sp.sa_addr.pppoe, &pppox_sk(sock->sk)->pppoe_pa,
717 sizeof(struct pppoe_addr));
719 memcpy(uaddr, &sp, len);
721 *usockaddr_len = len;
726 static int pppoe_ioctl(struct socket *sock, unsigned int cmd,
729 struct sock *sk = sock->sk;
730 struct pppox_sock *po = pppox_sk(sk);
737 if (!(sk->sk_state & PPPOX_CONNECTED))
741 if (put_user(po->pppoe_dev->mtu -
742 sizeof(struct pppoe_hdr) -
751 if (!(sk->sk_state & PPPOX_CONNECTED))
755 if (get_user(val, (int __user *)arg))
758 if (val < (po->pppoe_dev->mtu
759 - sizeof(struct pppoe_hdr)
768 if (get_user(val, (int __user *)arg))
775 struct pppox_sock *relay_po;
778 if (sk->sk_state & (PPPOX_BOUND | PPPOX_DEAD))
782 if (!(sk->sk_state & PPPOX_CONNECTED))
785 /* PPPoE address from the user specifies an outbound
786 PPPoE address which frames are forwarded to */
788 if (copy_from_user(&po->pppoe_relay,
790 sizeof(struct sockaddr_pppox)))
794 if (po->pppoe_relay.sa_family != AF_PPPOX ||
795 po->pppoe_relay.sa_protocol != PX_PROTO_OE)
798 /* Check that the socket referenced by the address
800 relay_po = get_item_by_addr(sock_net(sk), &po->pppoe_relay);
804 sock_put(sk_pppox(relay_po));
805 sk->sk_state |= PPPOX_RELAY;
812 if (!(sk->sk_state & PPPOX_RELAY))
815 sk->sk_state &= ~PPPOX_RELAY;
826 static int pppoe_sendmsg(struct socket *sock, struct msghdr *m,
830 struct sock *sk = sock->sk;
831 struct pppox_sock *po = pppox_sk(sk);
833 struct pppoe_hdr hdr;
834 struct pppoe_hdr *ph;
835 struct net_device *dev;
839 if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED)) {
852 if (total_len > (dev->mtu + dev->hard_header_len))
856 skb = sock_wmalloc(sk, total_len + dev->hard_header_len + 32,
863 /* Reserve space for headers. */
864 skb_reserve(skb, dev->hard_header_len);
865 skb_reset_network_header(skb);
869 skb->priority = sk->sk_priority;
870 skb->protocol = cpu_to_be16(ETH_P_PPP_SES);
872 ph = (struct pppoe_hdr *)skb_put(skb, total_len + sizeof(struct pppoe_hdr));
873 start = (char *)&ph->tag[0];
875 error = memcpy_from_msg(start, m, total_len);
882 dev_hard_header(skb, dev, ETH_P_PPP_SES,
883 po->pppoe_pa.remote, NULL, total_len);
885 memcpy(ph, &hdr, sizeof(struct pppoe_hdr));
887 ph->length = htons(total_len);
896 /************************************************************************
898 * xmit function for internal use.
900 ***********************************************************************/
901 static int __pppoe_xmit(struct sock *sk, struct sk_buff *skb)
903 struct pppox_sock *po = pppox_sk(sk);
904 struct net_device *dev = po->pppoe_dev;
905 struct pppoe_hdr *ph;
906 int data_len = skb->len;
908 /* The higher-level PPP code (ppp_unregister_channel()) ensures the PPP
909 * xmit operations conclude prior to an unregistration call. Thus
910 * sk->sk_state cannot change, so we don't need to do lock_sock().
911 * But, we also can't do a lock_sock since that introduces a potential
912 * deadlock as we'd reverse the lock ordering used when calling
913 * ppp_unregister_channel().
916 if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED))
922 /* Copy the data if there is no space for the header or if it's
925 if (skb_cow_head(skb, sizeof(*ph) + dev->hard_header_len))
928 __skb_push(skb, sizeof(*ph));
929 skb_reset_network_header(skb);
936 ph->length = htons(data_len);
938 skb->protocol = cpu_to_be16(ETH_P_PPP_SES);
941 dev_hard_header(skb, dev, ETH_P_PPP_SES,
942 po->pppoe_pa.remote, NULL, data_len);
952 /************************************************************************
954 * xmit function called by generic PPP driver
955 * sends PPP frame over PPPoE socket
957 ***********************************************************************/
958 static int pppoe_xmit(struct ppp_channel *chan, struct sk_buff *skb)
960 struct sock *sk = (struct sock *)chan->private;
961 return __pppoe_xmit(sk, skb);
964 static const struct ppp_channel_ops pppoe_chan_ops = {
965 .start_xmit = pppoe_xmit,
968 static int pppoe_recvmsg(struct socket *sock, struct msghdr *m,
969 size_t total_len, int flags)
971 struct sock *sk = sock->sk;
975 if (sk->sk_state & PPPOX_BOUND) {
980 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
981 flags & MSG_DONTWAIT, &error);
986 total_len = min_t(size_t, total_len, skb->len);
987 error = skb_copy_datagram_msg(skb, 0, m, total_len);
999 #ifdef CONFIG_PROC_FS
1000 static int pppoe_seq_show(struct seq_file *seq, void *v)
1002 struct pppox_sock *po;
1005 if (v == SEQ_START_TOKEN) {
1006 seq_puts(seq, "Id Address Device\n");
1011 dev_name = po->pppoe_pa.dev;
1013 seq_printf(seq, "%08X %pM %8s\n",
1014 po->pppoe_pa.sid, po->pppoe_pa.remote, dev_name);
1019 static inline struct pppox_sock *pppoe_get_idx(struct pppoe_net *pn, loff_t pos)
1021 struct pppox_sock *po;
1024 for (i = 0; i < PPPOE_HASH_SIZE; i++) {
1025 po = pn->hash_table[i];
1037 static void *pppoe_seq_start(struct seq_file *seq, loff_t *pos)
1038 __acquires(pn->hash_lock)
1040 struct pppoe_net *pn = pppoe_pernet(seq_file_net(seq));
1043 read_lock_bh(&pn->hash_lock);
1044 return l ? pppoe_get_idx(pn, --l) : SEQ_START_TOKEN;
1047 static void *pppoe_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1049 struct pppoe_net *pn = pppoe_pernet(seq_file_net(seq));
1050 struct pppox_sock *po;
1053 if (v == SEQ_START_TOKEN) {
1054 po = pppoe_get_idx(pn, 0);
1061 int hash = hash_item(po->pppoe_pa.sid, po->pppoe_pa.remote);
1064 while (++hash < PPPOE_HASH_SIZE) {
1065 po = pn->hash_table[hash];
1075 static void pppoe_seq_stop(struct seq_file *seq, void *v)
1076 __releases(pn->hash_lock)
1078 struct pppoe_net *pn = pppoe_pernet(seq_file_net(seq));
1079 read_unlock_bh(&pn->hash_lock);
1082 static const struct seq_operations pppoe_seq_ops = {
1083 .start = pppoe_seq_start,
1084 .next = pppoe_seq_next,
1085 .stop = pppoe_seq_stop,
1086 .show = pppoe_seq_show,
1089 static int pppoe_seq_open(struct inode *inode, struct file *file)
1091 return seq_open_net(inode, file, &pppoe_seq_ops,
1092 sizeof(struct seq_net_private));
1095 static const struct file_operations pppoe_seq_fops = {
1096 .owner = THIS_MODULE,
1097 .open = pppoe_seq_open,
1099 .llseek = seq_lseek,
1100 .release = seq_release_net,
1103 #endif /* CONFIG_PROC_FS */
1105 static const struct proto_ops pppoe_ops = {
1107 .owner = THIS_MODULE,
1108 .release = pppoe_release,
1109 .bind = sock_no_bind,
1110 .connect = pppoe_connect,
1111 .socketpair = sock_no_socketpair,
1112 .accept = sock_no_accept,
1113 .getname = pppoe_getname,
1114 .poll = datagram_poll,
1115 .listen = sock_no_listen,
1116 .shutdown = sock_no_shutdown,
1117 .setsockopt = sock_no_setsockopt,
1118 .getsockopt = sock_no_getsockopt,
1119 .sendmsg = pppoe_sendmsg,
1120 .recvmsg = pppoe_recvmsg,
1121 .mmap = sock_no_mmap,
1122 .ioctl = pppox_ioctl,
1125 static const struct pppox_proto pppoe_proto = {
1126 .create = pppoe_create,
1127 .ioctl = pppoe_ioctl,
1128 .owner = THIS_MODULE,
1131 static __net_init int pppoe_init_net(struct net *net)
1133 struct pppoe_net *pn = pppoe_pernet(net);
1134 struct proc_dir_entry *pde;
1136 rwlock_init(&pn->hash_lock);
1138 pde = proc_create("pppoe", S_IRUGO, net->proc_net, &pppoe_seq_fops);
1139 #ifdef CONFIG_PROC_FS
1147 static __net_exit void pppoe_exit_net(struct net *net)
1149 remove_proc_entry("pppoe", net->proc_net);
1152 static struct pernet_operations pppoe_net_ops = {
1153 .init = pppoe_init_net,
1154 .exit = pppoe_exit_net,
1155 .id = &pppoe_net_id,
1156 .size = sizeof(struct pppoe_net),
1159 static int __init pppoe_init(void)
1163 err = register_pernet_device(&pppoe_net_ops);
1167 err = proto_register(&pppoe_sk_proto, 0);
1169 goto out_unregister_net_ops;
1171 err = register_pppox_proto(PX_PROTO_OE, &pppoe_proto);
1173 goto out_unregister_pppoe_proto;
1175 dev_add_pack(&pppoes_ptype);
1176 dev_add_pack(&pppoed_ptype);
1177 register_netdevice_notifier(&pppoe_notifier);
1181 out_unregister_pppoe_proto:
1182 proto_unregister(&pppoe_sk_proto);
1183 out_unregister_net_ops:
1184 unregister_pernet_device(&pppoe_net_ops);
1189 static void __exit pppoe_exit(void)
1191 unregister_netdevice_notifier(&pppoe_notifier);
1192 dev_remove_pack(&pppoed_ptype);
1193 dev_remove_pack(&pppoes_ptype);
1194 unregister_pppox_proto(PX_PROTO_OE);
1195 proto_unregister(&pppoe_sk_proto);
1196 unregister_pernet_device(&pppoe_net_ops);
1199 module_init(pppoe_init);
1200 module_exit(pppoe_exit);
1202 MODULE_AUTHOR("Michal Ostrowski <mostrows@speakeasy.net>");
1203 MODULE_DESCRIPTION("PPP over Ethernet driver");
1204 MODULE_LICENSE("GPL");
1205 MODULE_ALIAS_NETPROTO(PF_PPPOX);