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 | PPPOX_ZOMBIE)) {
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 sock_put(sk_pppox(relay_po));
401 if (sock_queue_rcv_skb(sk, skb))
405 return NET_RX_SUCCESS;
408 sock_put(sk_pppox(relay_po));
415 /************************************************************************
417 * Receive wrapper called in BH context.
419 ***********************************************************************/
420 static int pppoe_rcv(struct sk_buff *skb, struct net_device *dev,
421 struct packet_type *pt, struct net_device *orig_dev)
423 struct pppoe_hdr *ph;
424 struct pppox_sock *po;
425 struct pppoe_net *pn;
428 skb = skb_share_check(skb, GFP_ATOMIC);
432 if (!pskb_may_pull(skb, sizeof(struct pppoe_hdr)))
436 len = ntohs(ph->length);
438 skb_pull_rcsum(skb, sizeof(*ph));
442 if (pskb_trim_rcsum(skb, len))
446 pn = pppoe_pernet(dev_net(dev));
448 /* Note that get_item does a sock_hold(), so sk_pppox(po)
449 * is known to be safe.
451 po = get_item(pn, ph->sid, eth_hdr(skb)->h_source, dev->ifindex);
455 return sk_receive_skb(sk_pppox(po), skb, 0);
463 static void pppoe_unbind_sock_work(struct work_struct *work)
465 struct pppox_sock *po = container_of(work, struct pppox_sock,
466 proto.pppoe.padt_work);
467 struct sock *sk = sk_pppox(po);
471 dev_put(po->pppoe_dev);
472 po->pppoe_dev = NULL;
474 pppox_unbind_sock(sk);
479 /************************************************************************
481 * Receive a PPPoE Discovery frame.
482 * This is solely for detection of PADT frames
484 ***********************************************************************/
485 static int pppoe_disc_rcv(struct sk_buff *skb, struct net_device *dev,
486 struct packet_type *pt, struct net_device *orig_dev)
489 struct pppoe_hdr *ph;
490 struct pppox_sock *po;
491 struct pppoe_net *pn;
493 skb = skb_share_check(skb, GFP_ATOMIC);
497 if (skb->pkt_type != PACKET_HOST)
500 if (!pskb_may_pull(skb, sizeof(struct pppoe_hdr)))
504 if (ph->code != PADT_CODE)
507 pn = pppoe_pernet(dev_net(dev));
508 po = get_item(pn, ph->sid, eth_hdr(skb)->h_source, dev->ifindex);
510 struct sock *sk = sk_pppox(po);
514 /* If the user has locked the socket, just ignore
515 * the packet. With the way two rcv protocols hook into
516 * one socket family type, we cannot (easily) distinguish
517 * what kind of SKB it is during backlog rcv.
519 if (sock_owned_by_user(sk) == 0) {
520 /* We're no longer connect at the PPPOE layer,
521 * and must wait for ppp channel to disconnect us.
523 sk->sk_state = PPPOX_ZOMBIE;
527 if (!schedule_work(&po->proto.pppoe.padt_work))
534 return NET_RX_SUCCESS; /* Lies... :-) */
537 static struct packet_type pppoes_ptype __read_mostly = {
538 .type = cpu_to_be16(ETH_P_PPP_SES),
542 static struct packet_type pppoed_ptype __read_mostly = {
543 .type = cpu_to_be16(ETH_P_PPP_DISC),
544 .func = pppoe_disc_rcv,
547 static struct proto pppoe_sk_proto __read_mostly = {
549 .owner = THIS_MODULE,
550 .obj_size = sizeof(struct pppox_sock),
553 /***********************************************************************
555 * Initialize a new struct sock.
557 **********************************************************************/
558 static int pppoe_create(struct net *net, struct socket *sock, int kern)
562 sk = sk_alloc(net, PF_PPPOX, GFP_KERNEL, &pppoe_sk_proto, kern);
566 sock_init_data(sock, sk);
568 sock->state = SS_UNCONNECTED;
569 sock->ops = &pppoe_ops;
571 sk->sk_backlog_rcv = pppoe_rcv_core;
572 sk->sk_state = PPPOX_NONE;
573 sk->sk_type = SOCK_STREAM;
574 sk->sk_family = PF_PPPOX;
575 sk->sk_protocol = PX_PROTO_OE;
577 INIT_WORK(&pppox_sk(sk)->proto.pppoe.padt_work,
578 pppoe_unbind_sock_work);
583 static int pppoe_release(struct socket *sock)
585 struct sock *sk = sock->sk;
586 struct pppox_sock *po;
587 struct pppoe_net *pn;
588 struct net *net = NULL;
594 if (sock_flag(sk, SOCK_DEAD)) {
602 dev_put(po->pppoe_dev);
603 po->pppoe_dev = NULL;
606 pppox_unbind_sock(sk);
608 /* Signal the death of the socket. */
609 sk->sk_state = PPPOX_DEAD;
612 pn = pppoe_pernet(net);
615 * protect "po" from concurrent updates
618 delete_item(pn, po->pppoe_pa.sid, po->pppoe_pa.remote,
624 skb_queue_purge(&sk->sk_receive_queue);
631 static int pppoe_connect(struct socket *sock, struct sockaddr *uservaddr,
632 int sockaddr_len, int flags)
634 struct sock *sk = sock->sk;
635 struct sockaddr_pppox *sp = (struct sockaddr_pppox *)uservaddr;
636 struct pppox_sock *po = pppox_sk(sk);
637 struct net_device *dev = NULL;
638 struct pppoe_net *pn;
639 struct net *net = NULL;
646 if (sockaddr_len != sizeof(struct sockaddr_pppox))
649 if (sp->sa_protocol != PX_PROTO_OE)
652 /* Check for already bound sockets */
654 if ((sk->sk_state & PPPOX_CONNECTED) &&
655 stage_session(sp->sa_addr.pppoe.sid))
658 /* Check for already disconnected sockets, on attempts to disconnect */
660 if ((sk->sk_state & PPPOX_DEAD) &&
661 !stage_session(sp->sa_addr.pppoe.sid))
666 /* Delete the old binding */
667 if (stage_session(po->pppoe_pa.sid)) {
668 pppox_unbind_sock(sk);
669 pn = pppoe_pernet(sock_net(sk));
670 delete_item(pn, po->pppoe_pa.sid,
671 po->pppoe_pa.remote, po->pppoe_ifindex);
673 dev_put(po->pppoe_dev);
674 po->pppoe_dev = NULL;
677 po->pppoe_ifindex = 0;
678 memset(&po->pppoe_pa, 0, sizeof(po->pppoe_pa));
679 memset(&po->pppoe_relay, 0, sizeof(po->pppoe_relay));
680 memset(&po->chan, 0, sizeof(po->chan));
684 sk->sk_state = PPPOX_NONE;
687 /* Re-bind in session stage only */
688 if (stage_session(sp->sa_addr.pppoe.sid)) {
691 dev = dev_get_by_name(net, sp->sa_addr.pppoe.dev);
696 po->pppoe_ifindex = dev->ifindex;
697 pn = pppoe_pernet(net);
698 if (!(dev->flags & IFF_UP)) {
702 memcpy(&po->pppoe_pa,
704 sizeof(struct pppoe_addr));
706 write_lock_bh(&pn->hash_lock);
707 error = __set_item(pn, po);
708 write_unlock_bh(&pn->hash_lock);
712 po->chan.hdrlen = (sizeof(struct pppoe_hdr) +
713 dev->hard_header_len);
715 po->chan.mtu = dev->mtu - sizeof(struct pppoe_hdr) - 2;
716 po->chan.private = sk;
717 po->chan.ops = &pppoe_chan_ops;
719 error = ppp_register_net_channel(dev_net(dev), &po->chan);
721 delete_item(pn, po->pppoe_pa.sid,
722 po->pppoe_pa.remote, po->pppoe_ifindex);
726 sk->sk_state = PPPOX_CONNECTED;
729 po->num = sp->sa_addr.pppoe.sid;
736 dev_put(po->pppoe_dev);
737 po->pppoe_dev = NULL;
742 static int pppoe_getname(struct socket *sock, struct sockaddr *uaddr,
743 int *usockaddr_len, int peer)
745 int len = sizeof(struct sockaddr_pppox);
746 struct sockaddr_pppox sp;
748 sp.sa_family = AF_PPPOX;
749 sp.sa_protocol = PX_PROTO_OE;
750 memcpy(&sp.sa_addr.pppoe, &pppox_sk(sock->sk)->pppoe_pa,
751 sizeof(struct pppoe_addr));
753 memcpy(uaddr, &sp, len);
755 *usockaddr_len = len;
760 static int pppoe_ioctl(struct socket *sock, unsigned int cmd,
763 struct sock *sk = sock->sk;
764 struct pppox_sock *po = pppox_sk(sk);
771 if (!(sk->sk_state & PPPOX_CONNECTED))
775 if (put_user(po->pppoe_dev->mtu -
776 sizeof(struct pppoe_hdr) -
785 if (!(sk->sk_state & PPPOX_CONNECTED))
789 if (get_user(val, (int __user *)arg))
792 if (val < (po->pppoe_dev->mtu
793 - sizeof(struct pppoe_hdr)
802 if (get_user(val, (int __user *)arg))
809 struct pppox_sock *relay_po;
812 if (sk->sk_state & (PPPOX_BOUND | PPPOX_ZOMBIE | PPPOX_DEAD))
816 if (!(sk->sk_state & PPPOX_CONNECTED))
819 /* PPPoE address from the user specifies an outbound
820 PPPoE address which frames are forwarded to */
822 if (copy_from_user(&po->pppoe_relay,
824 sizeof(struct sockaddr_pppox)))
828 if (po->pppoe_relay.sa_family != AF_PPPOX ||
829 po->pppoe_relay.sa_protocol != PX_PROTO_OE)
832 /* Check that the socket referenced by the address
834 relay_po = get_item_by_addr(sock_net(sk), &po->pppoe_relay);
838 sock_put(sk_pppox(relay_po));
839 sk->sk_state |= PPPOX_RELAY;
846 if (!(sk->sk_state & PPPOX_RELAY))
849 sk->sk_state &= ~PPPOX_RELAY;
860 static int pppoe_sendmsg(struct socket *sock, struct msghdr *m,
864 struct sock *sk = sock->sk;
865 struct pppox_sock *po = pppox_sk(sk);
867 struct pppoe_hdr hdr;
868 struct pppoe_hdr *ph;
869 struct net_device *dev;
874 if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED)) {
887 if (total_len > (dev->mtu + dev->hard_header_len))
890 hlen = LL_RESERVED_SPACE(dev);
891 skb = sock_wmalloc(sk, hlen + sizeof(*ph) + total_len +
892 dev->needed_tailroom, 0, GFP_KERNEL);
898 /* Reserve space for headers. */
899 skb_reserve(skb, hlen);
900 skb_reset_network_header(skb);
904 skb->priority = sk->sk_priority;
905 skb->protocol = cpu_to_be16(ETH_P_PPP_SES);
907 ph = (struct pppoe_hdr *)skb_put(skb, total_len + sizeof(struct pppoe_hdr));
908 start = (char *)&ph->tag[0];
910 error = memcpy_from_msg(start, m, total_len);
917 dev_hard_header(skb, dev, ETH_P_PPP_SES,
918 po->pppoe_pa.remote, NULL, total_len);
920 memcpy(ph, &hdr, sizeof(struct pppoe_hdr));
922 ph->length = htons(total_len);
931 /************************************************************************
933 * xmit function for internal use.
935 ***********************************************************************/
936 static int __pppoe_xmit(struct sock *sk, struct sk_buff *skb)
938 struct pppox_sock *po = pppox_sk(sk);
939 struct net_device *dev = po->pppoe_dev;
940 struct pppoe_hdr *ph;
941 int data_len = skb->len;
943 /* The higher-level PPP code (ppp_unregister_channel()) ensures the PPP
944 * xmit operations conclude prior to an unregistration call. Thus
945 * sk->sk_state cannot change, so we don't need to do lock_sock().
946 * But, we also can't do a lock_sock since that introduces a potential
947 * deadlock as we'd reverse the lock ordering used when calling
948 * ppp_unregister_channel().
951 if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED))
957 /* Copy the data if there is no space for the header or if it's
960 if (skb_cow_head(skb, LL_RESERVED_SPACE(dev) + sizeof(*ph)))
963 __skb_push(skb, sizeof(*ph));
964 skb_reset_network_header(skb);
971 ph->length = htons(data_len);
973 skb->protocol = cpu_to_be16(ETH_P_PPP_SES);
976 dev_hard_header(skb, dev, ETH_P_PPP_SES,
977 po->pppoe_pa.remote, NULL, data_len);
987 /************************************************************************
989 * xmit function called by generic PPP driver
990 * sends PPP frame over PPPoE socket
992 ***********************************************************************/
993 static int pppoe_xmit(struct ppp_channel *chan, struct sk_buff *skb)
995 struct sock *sk = (struct sock *)chan->private;
996 return __pppoe_xmit(sk, skb);
999 static const struct ppp_channel_ops pppoe_chan_ops = {
1000 .start_xmit = pppoe_xmit,
1003 static int pppoe_recvmsg(struct socket *sock, struct msghdr *m,
1004 size_t total_len, int flags)
1006 struct sock *sk = sock->sk;
1007 struct sk_buff *skb;
1010 if (sk->sk_state & PPPOX_BOUND) {
1015 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1016 flags & MSG_DONTWAIT, &error);
1021 total_len = min_t(size_t, total_len, skb->len);
1022 error = skb_copy_datagram_msg(skb, 0, m, total_len);
1034 #ifdef CONFIG_PROC_FS
1035 static int pppoe_seq_show(struct seq_file *seq, void *v)
1037 struct pppox_sock *po;
1040 if (v == SEQ_START_TOKEN) {
1041 seq_puts(seq, "Id Address Device\n");
1046 dev_name = po->pppoe_pa.dev;
1048 seq_printf(seq, "%08X %pM %8s\n",
1049 po->pppoe_pa.sid, po->pppoe_pa.remote, dev_name);
1054 static inline struct pppox_sock *pppoe_get_idx(struct pppoe_net *pn, loff_t pos)
1056 struct pppox_sock *po;
1059 for (i = 0; i < PPPOE_HASH_SIZE; i++) {
1060 po = pn->hash_table[i];
1072 static void *pppoe_seq_start(struct seq_file *seq, loff_t *pos)
1073 __acquires(pn->hash_lock)
1075 struct pppoe_net *pn = pppoe_pernet(seq_file_net(seq));
1078 read_lock_bh(&pn->hash_lock);
1079 return l ? pppoe_get_idx(pn, --l) : SEQ_START_TOKEN;
1082 static void *pppoe_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1084 struct pppoe_net *pn = pppoe_pernet(seq_file_net(seq));
1085 struct pppox_sock *po;
1088 if (v == SEQ_START_TOKEN) {
1089 po = pppoe_get_idx(pn, 0);
1096 int hash = hash_item(po->pppoe_pa.sid, po->pppoe_pa.remote);
1099 while (++hash < PPPOE_HASH_SIZE) {
1100 po = pn->hash_table[hash];
1110 static void pppoe_seq_stop(struct seq_file *seq, void *v)
1111 __releases(pn->hash_lock)
1113 struct pppoe_net *pn = pppoe_pernet(seq_file_net(seq));
1114 read_unlock_bh(&pn->hash_lock);
1117 static const struct seq_operations pppoe_seq_ops = {
1118 .start = pppoe_seq_start,
1119 .next = pppoe_seq_next,
1120 .stop = pppoe_seq_stop,
1121 .show = pppoe_seq_show,
1124 static int pppoe_seq_open(struct inode *inode, struct file *file)
1126 return seq_open_net(inode, file, &pppoe_seq_ops,
1127 sizeof(struct seq_net_private));
1130 static const struct file_operations pppoe_seq_fops = {
1131 .owner = THIS_MODULE,
1132 .open = pppoe_seq_open,
1134 .llseek = seq_lseek,
1135 .release = seq_release_net,
1138 #endif /* CONFIG_PROC_FS */
1140 static const struct proto_ops pppoe_ops = {
1142 .owner = THIS_MODULE,
1143 .release = pppoe_release,
1144 .bind = sock_no_bind,
1145 .connect = pppoe_connect,
1146 .socketpair = sock_no_socketpair,
1147 .accept = sock_no_accept,
1148 .getname = pppoe_getname,
1149 .poll = datagram_poll,
1150 .listen = sock_no_listen,
1151 .shutdown = sock_no_shutdown,
1152 .setsockopt = sock_no_setsockopt,
1153 .getsockopt = sock_no_getsockopt,
1154 .sendmsg = pppoe_sendmsg,
1155 .recvmsg = pppoe_recvmsg,
1156 .mmap = sock_no_mmap,
1157 .ioctl = pppox_ioctl,
1158 #ifdef CONFIG_COMPAT
1159 .compat_ioctl = pppox_compat_ioctl,
1163 static const struct pppox_proto pppoe_proto = {
1164 .create = pppoe_create,
1165 .ioctl = pppoe_ioctl,
1166 .owner = THIS_MODULE,
1169 static __net_init int pppoe_init_net(struct net *net)
1171 struct pppoe_net *pn = pppoe_pernet(net);
1172 struct proc_dir_entry *pde;
1174 rwlock_init(&pn->hash_lock);
1176 pde = proc_create("pppoe", S_IRUGO, net->proc_net, &pppoe_seq_fops);
1177 #ifdef CONFIG_PROC_FS
1185 static __net_exit void pppoe_exit_net(struct net *net)
1187 remove_proc_entry("pppoe", net->proc_net);
1190 static struct pernet_operations pppoe_net_ops = {
1191 .init = pppoe_init_net,
1192 .exit = pppoe_exit_net,
1193 .id = &pppoe_net_id,
1194 .size = sizeof(struct pppoe_net),
1197 static int __init pppoe_init(void)
1201 err = register_pernet_device(&pppoe_net_ops);
1205 err = proto_register(&pppoe_sk_proto, 0);
1207 goto out_unregister_net_ops;
1209 err = register_pppox_proto(PX_PROTO_OE, &pppoe_proto);
1211 goto out_unregister_pppoe_proto;
1213 dev_add_pack(&pppoes_ptype);
1214 dev_add_pack(&pppoed_ptype);
1215 register_netdevice_notifier(&pppoe_notifier);
1219 out_unregister_pppoe_proto:
1220 proto_unregister(&pppoe_sk_proto);
1221 out_unregister_net_ops:
1222 unregister_pernet_device(&pppoe_net_ops);
1227 static void __exit pppoe_exit(void)
1229 unregister_netdevice_notifier(&pppoe_notifier);
1230 dev_remove_pack(&pppoed_ptype);
1231 dev_remove_pack(&pppoes_ptype);
1232 unregister_pppox_proto(PX_PROTO_OE);
1233 proto_unregister(&pppoe_sk_proto);
1234 unregister_pernet_device(&pppoe_net_ops);
1237 module_init(pppoe_init);
1238 module_exit(pppoe_exit);
1240 MODULE_AUTHOR("Michal Ostrowski <mostrows@speakeasy.net>");
1241 MODULE_DESCRIPTION("PPP over Ethernet driver");
1242 MODULE_LICENSE("GPL");
1243 MODULE_ALIAS_NETPROTO(PF_PPPOX);