1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /** -*- linux-c -*- ***********************************************************
3 * Linux PPP over Ethernet (PPPoX/PPPoE) Sockets
5 * PPPoX --- Generic PPP encapsulation socket family
6 * 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)
55 #include <linux/string.h>
56 #include <linux/module.h>
57 #include <linux/kernel.h>
58 #include <linux/slab.h>
59 #include <linux/errno.h>
60 #include <linux/netdevice.h>
61 #include <linux/net.h>
62 #include <linux/inetdevice.h>
63 #include <linux/etherdevice.h>
64 #include <linux/skbuff.h>
65 #include <linux/init.h>
66 #include <linux/if_ether.h>
67 #include <linux/if_pppox.h>
68 #include <linux/ppp_channel.h>
69 #include <linux/ppp_defs.h>
70 #include <linux/ppp-ioctl.h>
71 #include <linux/notifier.h>
72 #include <linux/file.h>
73 #include <linux/proc_fs.h>
74 #include <linux/seq_file.h>
76 #include <linux/nsproxy.h>
77 #include <net/net_namespace.h>
78 #include <net/netns/generic.h>
81 #include <linux/uaccess.h>
83 #define PPPOE_HASH_BITS 4
84 #define PPPOE_HASH_SIZE (1 << PPPOE_HASH_BITS)
85 #define PPPOE_HASH_MASK (PPPOE_HASH_SIZE - 1)
87 static int __pppoe_xmit(struct sock *sk, struct sk_buff *skb);
89 static const struct proto_ops pppoe_ops;
90 static const struct ppp_channel_ops pppoe_chan_ops;
92 /* per-net private data for this module */
93 static unsigned int pppoe_net_id __read_mostly;
96 * we could use _single_ hash table for all
97 * nets by injecting net id into the hash but
98 * it would increase hash chains and add
99 * a few additional math comparations messy
100 * as well, moreover in case of SMP less locking
103 struct pppox_sock *hash_table[PPPOE_HASH_SIZE];
108 * PPPoE could be in the following stages:
109 * 1) Discovery stage (to obtain remote MAC and Session ID)
110 * 2) Session stage (MAC and SID are known)
112 * Ethernet frames have a special tag for this but
113 * we use simpler approach based on session id
115 static inline bool stage_session(__be16 sid)
120 static inline struct pppoe_net *pppoe_pernet(struct net *net)
124 return net_generic(net, pppoe_net_id);
127 static inline int cmp_2_addr(struct pppoe_addr *a, struct pppoe_addr *b)
129 return a->sid == b->sid && ether_addr_equal(a->remote, b->remote);
132 static inline int cmp_addr(struct pppoe_addr *a, __be16 sid, char *addr)
134 return a->sid == sid && ether_addr_equal(a->remote, addr);
137 #if 8 % PPPOE_HASH_BITS
138 #error 8 must be a multiple of PPPOE_HASH_BITS
141 static int hash_item(__be16 sid, unsigned char *addr)
143 unsigned char hash = 0;
146 for (i = 0; i < ETH_ALEN; i++)
148 for (i = 0; i < sizeof(sid_t) * 8; i += 8)
149 hash ^= (__force __u32)sid >> i;
150 for (i = 8; (i >>= 1) >= PPPOE_HASH_BITS;)
153 return hash & PPPOE_HASH_MASK;
156 /**********************************************************************
158 * Set/get/delete/rehash items (internal versions)
160 **********************************************************************/
161 static struct pppox_sock *__get_item(struct pppoe_net *pn, __be16 sid,
162 unsigned char *addr, int ifindex)
164 int hash = hash_item(sid, addr);
165 struct pppox_sock *ret;
167 ret = pn->hash_table[hash];
169 if (cmp_addr(&ret->pppoe_pa, sid, addr) &&
170 ret->pppoe_ifindex == ifindex)
179 static int __set_item(struct pppoe_net *pn, struct pppox_sock *po)
181 int hash = hash_item(po->pppoe_pa.sid, po->pppoe_pa.remote);
182 struct pppox_sock *ret;
184 ret = pn->hash_table[hash];
186 if (cmp_2_addr(&ret->pppoe_pa, &po->pppoe_pa) &&
187 ret->pppoe_ifindex == po->pppoe_ifindex)
193 po->next = pn->hash_table[hash];
194 pn->hash_table[hash] = po;
199 static void __delete_item(struct pppoe_net *pn, __be16 sid,
200 char *addr, int ifindex)
202 int hash = hash_item(sid, addr);
203 struct pppox_sock *ret, **src;
205 ret = pn->hash_table[hash];
206 src = &pn->hash_table[hash];
209 if (cmp_addr(&ret->pppoe_pa, sid, addr) &&
210 ret->pppoe_ifindex == ifindex) {
220 /**********************************************************************
222 * Set/get/delete/rehash items
224 **********************************************************************/
225 static inline struct pppox_sock *get_item(struct pppoe_net *pn, __be16 sid,
226 unsigned char *addr, int ifindex)
228 struct pppox_sock *po;
230 read_lock_bh(&pn->hash_lock);
231 po = __get_item(pn, sid, addr, ifindex);
233 sock_hold(sk_pppox(po));
234 read_unlock_bh(&pn->hash_lock);
239 static inline struct pppox_sock *get_item_by_addr(struct net *net,
240 struct sockaddr_pppox *sp)
242 struct net_device *dev;
243 struct pppoe_net *pn;
244 struct pppox_sock *pppox_sock = NULL;
249 dev = dev_get_by_name_rcu(net, sp->sa_addr.pppoe.dev);
251 ifindex = dev->ifindex;
252 pn = pppoe_pernet(net);
253 pppox_sock = get_item(pn, sp->sa_addr.pppoe.sid,
254 sp->sa_addr.pppoe.remote, ifindex);
260 static inline void delete_item(struct pppoe_net *pn, __be16 sid,
261 char *addr, int ifindex)
263 write_lock_bh(&pn->hash_lock);
264 __delete_item(pn, sid, addr, ifindex);
265 write_unlock_bh(&pn->hash_lock);
268 /***************************************************************************
270 * Handler for device events.
271 * Certain device events require that sockets be unconnected.
273 **************************************************************************/
275 static void pppoe_flush_dev(struct net_device *dev)
277 struct pppoe_net *pn;
280 pn = pppoe_pernet(dev_net(dev));
281 write_lock_bh(&pn->hash_lock);
282 for (i = 0; i < PPPOE_HASH_SIZE; i++) {
283 struct pppox_sock *po = pn->hash_table[i];
287 while (po && po->pppoe_dev != dev) {
296 /* We always grab the socket lock, followed by the
297 * hash_lock, in that order. Since we should hold the
298 * sock lock while doing any unbinding, we need to
299 * release the lock we're holding. Hold a reference to
300 * the sock so it doesn't disappear as we're jumping
305 write_unlock_bh(&pn->hash_lock);
308 if (po->pppoe_dev == dev &&
309 sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND)) {
310 pppox_unbind_sock(sk);
311 sk->sk_state_change(sk);
312 po->pppoe_dev = NULL;
319 /* Restart the process from the start of the current
320 * hash chain. We dropped locks so the world may have
321 * change from underneath us.
324 BUG_ON(pppoe_pernet(dev_net(dev)) == NULL);
325 write_lock_bh(&pn->hash_lock);
326 po = pn->hash_table[i];
329 write_unlock_bh(&pn->hash_lock);
332 static int pppoe_device_event(struct notifier_block *this,
333 unsigned long event, void *ptr)
335 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
337 /* Only look at sockets that are using this specific device. */
339 case NETDEV_CHANGEADDR:
340 case NETDEV_CHANGEMTU:
341 /* A change in mtu or address is a bad thing, requiring
342 * LCP re-negotiation.
345 case NETDEV_GOING_DOWN:
347 /* Find every socket on this device and kill it. */
348 pppoe_flush_dev(dev);
358 static struct notifier_block pppoe_notifier = {
359 .notifier_call = pppoe_device_event,
362 /************************************************************************
364 * Do the real work of receiving a PPPoE Session frame.
366 ***********************************************************************/
367 static int pppoe_rcv_core(struct sock *sk, struct sk_buff *skb)
369 struct pppox_sock *po = pppox_sk(sk);
370 struct pppox_sock *relay_po;
372 /* Backlog receive. Semantics of backlog rcv preclude any code from
373 * executing in lock_sock()/release_sock() bounds; meaning sk->sk_state
377 if (skb->pkt_type == PACKET_OTHERHOST)
380 if (sk->sk_state & PPPOX_BOUND) {
381 ppp_input(&po->chan, skb);
382 } else if (sk->sk_state & PPPOX_RELAY) {
383 relay_po = get_item_by_addr(sock_net(sk),
385 if (relay_po == NULL)
388 if ((sk_pppox(relay_po)->sk_state & PPPOX_CONNECTED) == 0)
391 if (!__pppoe_xmit(sk_pppox(relay_po), skb))
394 sock_put(sk_pppox(relay_po));
396 if (sock_queue_rcv_skb(sk, skb))
400 return NET_RX_SUCCESS;
403 sock_put(sk_pppox(relay_po));
410 /************************************************************************
412 * Receive wrapper called in BH context.
414 ***********************************************************************/
415 static int pppoe_rcv(struct sk_buff *skb, struct net_device *dev,
416 struct packet_type *pt, struct net_device *orig_dev)
418 struct pppoe_hdr *ph;
419 struct pppox_sock *po;
420 struct pppoe_net *pn;
423 skb = skb_share_check(skb, GFP_ATOMIC);
427 if (skb_mac_header_len(skb) < ETH_HLEN)
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))
444 pn = pppoe_pernet(dev_net(dev));
446 /* Note that get_item does a sock_hold(), so sk_pppox(po)
447 * is known to be safe.
449 po = get_item(pn, ph->sid, eth_hdr(skb)->h_source, dev->ifindex);
453 return sk_receive_skb(sk_pppox(po), skb, 0);
461 static void pppoe_unbind_sock_work(struct work_struct *work)
463 struct pppox_sock *po = container_of(work, struct pppox_sock,
464 proto.pppoe.padt_work);
465 struct sock *sk = sk_pppox(po);
469 dev_put(po->pppoe_dev);
470 po->pppoe_dev = NULL;
472 pppox_unbind_sock(sk);
477 /************************************************************************
479 * Receive a PPPoE Discovery frame.
480 * This is solely for detection of PADT frames
482 ***********************************************************************/
483 static int pppoe_disc_rcv(struct sk_buff *skb, struct net_device *dev,
484 struct packet_type *pt, struct net_device *orig_dev)
487 struct pppoe_hdr *ph;
488 struct pppox_sock *po;
489 struct pppoe_net *pn;
491 skb = skb_share_check(skb, GFP_ATOMIC);
495 if (skb->pkt_type != PACKET_HOST)
498 if (!pskb_may_pull(skb, sizeof(struct pppoe_hdr)))
502 if (ph->code != PADT_CODE)
505 pn = pppoe_pernet(dev_net(dev));
506 po = get_item(pn, ph->sid, eth_hdr(skb)->h_source, dev->ifindex);
508 if (!schedule_work(&po->proto.pppoe.padt_work))
509 sock_put(sk_pppox(po));
514 return NET_RX_SUCCESS; /* Lies... :-) */
517 static struct packet_type pppoes_ptype __read_mostly = {
518 .type = cpu_to_be16(ETH_P_PPP_SES),
522 static struct packet_type pppoed_ptype __read_mostly = {
523 .type = cpu_to_be16(ETH_P_PPP_DISC),
524 .func = pppoe_disc_rcv,
527 static struct proto pppoe_sk_proto __read_mostly = {
529 .owner = THIS_MODULE,
530 .obj_size = sizeof(struct pppox_sock),
533 /***********************************************************************
535 * Initialize a new struct sock.
537 **********************************************************************/
538 static int pppoe_create(struct net *net, struct socket *sock, int kern)
542 sk = sk_alloc(net, PF_PPPOX, GFP_KERNEL, &pppoe_sk_proto, kern);
546 sock_init_data(sock, sk);
548 sock->state = SS_UNCONNECTED;
549 sock->ops = &pppoe_ops;
551 sk->sk_backlog_rcv = pppoe_rcv_core;
552 sk->sk_state = PPPOX_NONE;
553 sk->sk_type = SOCK_STREAM;
554 sk->sk_family = PF_PPPOX;
555 sk->sk_protocol = PX_PROTO_OE;
557 INIT_WORK(&pppox_sk(sk)->proto.pppoe.padt_work,
558 pppoe_unbind_sock_work);
563 static int pppoe_release(struct socket *sock)
565 struct sock *sk = sock->sk;
566 struct pppox_sock *po;
567 struct pppoe_net *pn;
568 struct net *net = NULL;
574 if (sock_flag(sk, SOCK_DEAD)) {
582 dev_put(po->pppoe_dev);
583 po->pppoe_dev = NULL;
586 pppox_unbind_sock(sk);
588 /* Signal the death of the socket. */
589 sk->sk_state = PPPOX_DEAD;
592 pn = pppoe_pernet(net);
595 * protect "po" from concurrent updates
598 delete_item(pn, po->pppoe_pa.sid, po->pppoe_pa.remote,
604 skb_queue_purge(&sk->sk_receive_queue);
611 static int pppoe_connect(struct socket *sock, struct sockaddr *uservaddr,
612 int sockaddr_len, int flags)
614 struct sock *sk = sock->sk;
615 struct sockaddr_pppox *sp = (struct sockaddr_pppox *)uservaddr;
616 struct pppox_sock *po = pppox_sk(sk);
617 struct net_device *dev = NULL;
618 struct pppoe_net *pn;
619 struct net *net = NULL;
626 if (sockaddr_len != sizeof(struct sockaddr_pppox))
629 if (sp->sa_protocol != PX_PROTO_OE)
632 /* Check for already bound sockets */
634 if ((sk->sk_state & PPPOX_CONNECTED) &&
635 stage_session(sp->sa_addr.pppoe.sid))
638 /* Check for already disconnected sockets, on attempts to disconnect */
640 if ((sk->sk_state & PPPOX_DEAD) &&
641 !stage_session(sp->sa_addr.pppoe.sid))
646 /* Delete the old binding */
647 if (stage_session(po->pppoe_pa.sid)) {
648 pppox_unbind_sock(sk);
649 pn = pppoe_pernet(sock_net(sk));
650 delete_item(pn, po->pppoe_pa.sid,
651 po->pppoe_pa.remote, po->pppoe_ifindex);
653 dev_put(po->pppoe_dev);
654 po->pppoe_dev = NULL;
657 po->pppoe_ifindex = 0;
658 memset(&po->pppoe_pa, 0, sizeof(po->pppoe_pa));
659 memset(&po->pppoe_relay, 0, sizeof(po->pppoe_relay));
660 memset(&po->chan, 0, sizeof(po->chan));
664 sk->sk_state = PPPOX_NONE;
667 /* Re-bind in session stage only */
668 if (stage_session(sp->sa_addr.pppoe.sid)) {
671 dev = dev_get_by_name(net, sp->sa_addr.pppoe.dev);
676 po->pppoe_ifindex = dev->ifindex;
677 pn = pppoe_pernet(net);
678 if (!(dev->flags & IFF_UP)) {
682 memcpy(&po->pppoe_pa,
684 sizeof(struct pppoe_addr));
686 write_lock_bh(&pn->hash_lock);
687 error = __set_item(pn, po);
688 write_unlock_bh(&pn->hash_lock);
692 po->chan.hdrlen = (sizeof(struct pppoe_hdr) +
693 dev->hard_header_len);
695 po->chan.mtu = dev->mtu - sizeof(struct pppoe_hdr) - 2;
696 po->chan.private = sk;
697 po->chan.ops = &pppoe_chan_ops;
699 error = ppp_register_net_channel(dev_net(dev), &po->chan);
701 delete_item(pn, po->pppoe_pa.sid,
702 po->pppoe_pa.remote, po->pppoe_ifindex);
706 sk->sk_state = PPPOX_CONNECTED;
709 po->num = sp->sa_addr.pppoe.sid;
716 dev_put(po->pppoe_dev);
717 po->pppoe_dev = NULL;
722 static int pppoe_getname(struct socket *sock, struct sockaddr *uaddr,
725 int len = sizeof(struct sockaddr_pppox);
726 struct sockaddr_pppox sp;
728 sp.sa_family = AF_PPPOX;
729 sp.sa_protocol = PX_PROTO_OE;
730 memcpy(&sp.sa_addr.pppoe, &pppox_sk(sock->sk)->pppoe_pa,
731 sizeof(struct pppoe_addr));
733 memcpy(uaddr, &sp, len);
738 static int pppoe_ioctl(struct socket *sock, unsigned int cmd,
741 struct sock *sk = sock->sk;
742 struct pppox_sock *po = pppox_sk(sk);
749 if (!(sk->sk_state & PPPOX_CONNECTED))
753 if (put_user(po->pppoe_dev->mtu -
754 sizeof(struct pppoe_hdr) -
763 if (!(sk->sk_state & PPPOX_CONNECTED))
767 if (get_user(val, (int __user *)arg))
770 if (val < (po->pppoe_dev->mtu
771 - sizeof(struct pppoe_hdr)
780 if (get_user(val, (int __user *)arg))
787 struct pppox_sock *relay_po;
790 if (sk->sk_state & (PPPOX_BOUND | PPPOX_DEAD))
794 if (!(sk->sk_state & PPPOX_CONNECTED))
797 /* PPPoE address from the user specifies an outbound
798 PPPoE address which frames are forwarded to */
800 if (copy_from_user(&po->pppoe_relay,
802 sizeof(struct sockaddr_pppox)))
806 if (po->pppoe_relay.sa_family != AF_PPPOX ||
807 po->pppoe_relay.sa_protocol != PX_PROTO_OE)
810 /* Check that the socket referenced by the address
812 relay_po = get_item_by_addr(sock_net(sk), &po->pppoe_relay);
816 sock_put(sk_pppox(relay_po));
817 sk->sk_state |= PPPOX_RELAY;
824 if (!(sk->sk_state & PPPOX_RELAY))
827 sk->sk_state &= ~PPPOX_RELAY;
838 static int pppoe_sendmsg(struct socket *sock, struct msghdr *m,
842 struct sock *sk = sock->sk;
843 struct pppox_sock *po = pppox_sk(sk);
845 struct pppoe_hdr hdr;
846 struct pppoe_hdr *ph;
847 struct net_device *dev;
852 if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED)) {
865 if (total_len > (dev->mtu + dev->hard_header_len))
868 hlen = LL_RESERVED_SPACE(dev);
869 skb = sock_wmalloc(sk, hlen + sizeof(*ph) + total_len +
870 dev->needed_tailroom, 0, GFP_KERNEL);
876 /* Reserve space for headers. */
877 skb_reserve(skb, hlen);
878 skb_reset_network_header(skb);
882 skb->priority = sk->sk_priority;
883 skb->protocol = cpu_to_be16(ETH_P_PPP_SES);
885 ph = skb_put(skb, total_len + sizeof(struct pppoe_hdr));
886 start = (char *)&ph->tag[0];
888 error = memcpy_from_msg(start, m, total_len);
895 dev_hard_header(skb, dev, ETH_P_PPP_SES,
896 po->pppoe_pa.remote, NULL, total_len);
898 memcpy(ph, &hdr, sizeof(struct pppoe_hdr));
900 ph->length = htons(total_len);
909 /************************************************************************
911 * xmit function for internal use.
913 ***********************************************************************/
914 static int __pppoe_xmit(struct sock *sk, struct sk_buff *skb)
916 struct pppox_sock *po = pppox_sk(sk);
917 struct net_device *dev = po->pppoe_dev;
918 struct pppoe_hdr *ph;
919 int data_len = skb->len;
921 /* The higher-level PPP code (ppp_unregister_channel()) ensures the PPP
922 * xmit operations conclude prior to an unregistration call. Thus
923 * sk->sk_state cannot change, so we don't need to do lock_sock().
924 * But, we also can't do a lock_sock since that introduces a potential
925 * deadlock as we'd reverse the lock ordering used when calling
926 * ppp_unregister_channel().
929 if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED))
935 /* Copy the data if there is no space for the header or if it's
938 if (skb_cow_head(skb, LL_RESERVED_SPACE(dev) + sizeof(*ph)))
941 __skb_push(skb, sizeof(*ph));
942 skb_reset_network_header(skb);
949 ph->length = htons(data_len);
951 skb->protocol = cpu_to_be16(ETH_P_PPP_SES);
954 dev_hard_header(skb, dev, ETH_P_PPP_SES,
955 po->pppoe_pa.remote, NULL, data_len);
965 /************************************************************************
967 * xmit function called by generic PPP driver
968 * sends PPP frame over PPPoE socket
970 ***********************************************************************/
971 static int pppoe_xmit(struct ppp_channel *chan, struct sk_buff *skb)
973 struct sock *sk = (struct sock *)chan->private;
974 return __pppoe_xmit(sk, skb);
977 static const struct ppp_channel_ops pppoe_chan_ops = {
978 .start_xmit = pppoe_xmit,
981 static int pppoe_recvmsg(struct socket *sock, struct msghdr *m,
982 size_t total_len, int flags)
984 struct sock *sk = sock->sk;
988 if (sk->sk_state & PPPOX_BOUND) {
993 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
994 flags & MSG_DONTWAIT, &error);
999 total_len = min_t(size_t, total_len, skb->len);
1000 error = skb_copy_datagram_msg(skb, 0, m, total_len);
1012 #ifdef CONFIG_PROC_FS
1013 static int pppoe_seq_show(struct seq_file *seq, void *v)
1015 struct pppox_sock *po;
1018 if (v == SEQ_START_TOKEN) {
1019 seq_puts(seq, "Id Address Device\n");
1024 dev_name = po->pppoe_pa.dev;
1026 seq_printf(seq, "%08X %pM %8s\n",
1027 po->pppoe_pa.sid, po->pppoe_pa.remote, dev_name);
1032 static inline struct pppox_sock *pppoe_get_idx(struct pppoe_net *pn, loff_t pos)
1034 struct pppox_sock *po;
1037 for (i = 0; i < PPPOE_HASH_SIZE; i++) {
1038 po = pn->hash_table[i];
1050 static void *pppoe_seq_start(struct seq_file *seq, loff_t *pos)
1051 __acquires(pn->hash_lock)
1053 struct pppoe_net *pn = pppoe_pernet(seq_file_net(seq));
1056 read_lock_bh(&pn->hash_lock);
1057 return l ? pppoe_get_idx(pn, --l) : SEQ_START_TOKEN;
1060 static void *pppoe_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1062 struct pppoe_net *pn = pppoe_pernet(seq_file_net(seq));
1063 struct pppox_sock *po;
1066 if (v == SEQ_START_TOKEN) {
1067 po = pppoe_get_idx(pn, 0);
1074 int hash = hash_item(po->pppoe_pa.sid, po->pppoe_pa.remote);
1077 while (++hash < PPPOE_HASH_SIZE) {
1078 po = pn->hash_table[hash];
1088 static void pppoe_seq_stop(struct seq_file *seq, void *v)
1089 __releases(pn->hash_lock)
1091 struct pppoe_net *pn = pppoe_pernet(seq_file_net(seq));
1092 read_unlock_bh(&pn->hash_lock);
1095 static const struct seq_operations pppoe_seq_ops = {
1096 .start = pppoe_seq_start,
1097 .next = pppoe_seq_next,
1098 .stop = pppoe_seq_stop,
1099 .show = pppoe_seq_show,
1101 #endif /* CONFIG_PROC_FS */
1103 static const struct proto_ops pppoe_ops = {
1105 .owner = THIS_MODULE,
1106 .release = pppoe_release,
1107 .bind = sock_no_bind,
1108 .connect = pppoe_connect,
1109 .socketpair = sock_no_socketpair,
1110 .accept = sock_no_accept,
1111 .getname = pppoe_getname,
1112 .poll = datagram_poll,
1113 .listen = sock_no_listen,
1114 .shutdown = sock_no_shutdown,
1115 .setsockopt = sock_no_setsockopt,
1116 .getsockopt = sock_no_getsockopt,
1117 .sendmsg = pppoe_sendmsg,
1118 .recvmsg = pppoe_recvmsg,
1119 .mmap = sock_no_mmap,
1120 .ioctl = pppox_ioctl,
1121 #ifdef CONFIG_COMPAT
1122 .compat_ioctl = pppox_compat_ioctl,
1126 static const struct pppox_proto pppoe_proto = {
1127 .create = pppoe_create,
1128 .ioctl = pppoe_ioctl,
1129 .owner = THIS_MODULE,
1132 static __net_init int pppoe_init_net(struct net *net)
1134 struct pppoe_net *pn = pppoe_pernet(net);
1135 struct proc_dir_entry *pde;
1137 rwlock_init(&pn->hash_lock);
1139 pde = proc_create_net("pppoe", 0444, net->proc_net,
1140 &pppoe_seq_ops, sizeof(struct seq_net_private));
1141 #ifdef CONFIG_PROC_FS
1149 static __net_exit void pppoe_exit_net(struct net *net)
1151 remove_proc_entry("pppoe", net->proc_net);
1154 static struct pernet_operations pppoe_net_ops = {
1155 .init = pppoe_init_net,
1156 .exit = pppoe_exit_net,
1157 .id = &pppoe_net_id,
1158 .size = sizeof(struct pppoe_net),
1161 static int __init pppoe_init(void)
1165 err = register_pernet_device(&pppoe_net_ops);
1169 err = proto_register(&pppoe_sk_proto, 0);
1171 goto out_unregister_net_ops;
1173 err = register_pppox_proto(PX_PROTO_OE, &pppoe_proto);
1175 goto out_unregister_pppoe_proto;
1177 dev_add_pack(&pppoes_ptype);
1178 dev_add_pack(&pppoed_ptype);
1179 register_netdevice_notifier(&pppoe_notifier);
1183 out_unregister_pppoe_proto:
1184 proto_unregister(&pppoe_sk_proto);
1185 out_unregister_net_ops:
1186 unregister_pernet_device(&pppoe_net_ops);
1191 static void __exit pppoe_exit(void)
1193 unregister_netdevice_notifier(&pppoe_notifier);
1194 dev_remove_pack(&pppoed_ptype);
1195 dev_remove_pack(&pppoes_ptype);
1196 unregister_pppox_proto(PX_PROTO_OE);
1197 proto_unregister(&pppoe_sk_proto);
1198 unregister_pernet_device(&pppoe_net_ops);
1201 module_init(pppoe_init);
1202 module_exit(pppoe_exit);
1204 MODULE_AUTHOR("Michal Ostrowski <mostrows@speakeasy.net>");
1205 MODULE_DESCRIPTION("PPP over Ethernet driver");
1206 MODULE_LICENSE("GPL");
1207 MODULE_ALIAS_NET_PF_PROTO(PF_PPPOX, PX_PROTO_OE);