diff options
Diffstat (limited to 'drivers/net/pppoe.c')
| -rw-r--r-- | drivers/net/pppoe.c | 1136 |
1 files changed, 0 insertions, 1136 deletions
diff --git a/drivers/net/pppoe.c b/drivers/net/pppoe.c deleted file mode 100644 index ac0ac98b19c..00000000000 --- a/drivers/net/pppoe.c +++ /dev/null @@ -1,1136 +0,0 @@ -/** -*- linux-c -*- *********************************************************** - * Linux PPP over Ethernet (PPPoX/PPPoE) Sockets - * - * PPPoX --- Generic PPP encapsulation socket family - * PPPoE --- PPP over Ethernet (RFC 2516) - * - * - * Version: 0.7.0 - * - * 070228 : Fix to allow multiple sessions with same remote MAC and same - * session id by including the local device ifindex in the - * tuple identifying a session. This also ensures packets can't - * be injected into a session from interfaces other than the one - * specified by userspace. Florian Zumbiehl <florz@florz.de> - * (Oh, BTW, this one is YYMMDD, in case you were wondering ...) - * 220102 : Fix module use count on failure in pppoe_create, pppox_sk -acme - * 030700 : Fixed connect logic to allow for disconnect. - * 270700 : Fixed potential SMP problems; we must protect against - * simultaneous invocation of ppp_input - * and ppp_unregister_channel. - * 040800 : Respect reference count mechanisms on net-devices. - * 200800 : fix kfree(skb) in pppoe_rcv (acme) - * Module reference count is decremented in the right spot now, - * guards against sock_put not actually freeing the sk - * in pppoe_release. - * 051000 : Initialization cleanup. - * 111100 : Fix recvmsg. - * 050101 : Fix PADT procesing. - * 140501 : Use pppoe_rcv_core to handle all backlog. (Alexey) - * 170701 : Do not lock_sock with rwlock held. (DaveM) - * Ignore discovery frames if user has socket - * locked. (DaveM) - * Ignore return value of dev_queue_xmit in __pppoe_xmit - * or else we may kfree an SKB twice. (DaveM) - * 190701 : When doing copies of skb's in __pppoe_xmit, always delete - * the original skb that was passed in on success, never on - * failure. Delete the copy of the skb on failure to avoid - * a memory leak. - * 081001 : Misc. cleanup (licence string, non-blocking, prevent - * reference of device on close). - * 121301 : New ppp channels interface; cannot unregister a channel - * from interrupts. Thus, we mark the socket as a ZOMBIE - * and do the unregistration later. - * 081002 : seq_file support for proc stuff -acme - * 111602 : Merge all 2.4 fixes into 2.5/2.6 tree. Label 2.5/2.6 - * as version 0.7. Spacing cleanup. - * Author: Michal Ostrowski <mostrows@speakeasy.net> - * Contributors: - * Arnaldo Carvalho de Melo <acme@conectiva.com.br> - * David S. Miller (davem@redhat.com) - * - * License: - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * as published by the Free Software Foundation; either version - * 2 of the License, or (at your option) any later version. - * - */ - -#include <linux/string.h> -#include <linux/module.h> -#include <linux/kernel.h> -#include <linux/slab.h> -#include <linux/errno.h> -#include <linux/netdevice.h> -#include <linux/net.h> -#include <linux/inetdevice.h> -#include <linux/etherdevice.h> -#include <linux/skbuff.h> -#include <linux/init.h> -#include <linux/if_ether.h> -#include <linux/if_pppox.h> -#include <linux/ppp_channel.h> -#include <linux/ppp_defs.h> -#include <linux/if_ppp.h> -#include <linux/notifier.h> -#include <linux/file.h> -#include <linux/proc_fs.h> -#include <linux/seq_file.h> - -#include <net/net_namespace.h> -#include <net/sock.h> - -#include <asm/uaccess.h> - -#define PPPOE_HASH_BITS 4 -#define PPPOE_HASH_SIZE (1<<PPPOE_HASH_BITS) - -static struct ppp_channel_ops pppoe_chan_ops; - -static int pppoe_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg); -static int pppoe_xmit(struct ppp_channel *chan, struct sk_buff *skb); -static int __pppoe_xmit(struct sock *sk, struct sk_buff *skb); - -static const struct proto_ops pppoe_ops; -static DEFINE_RWLOCK(pppoe_hash_lock); - -static struct ppp_channel_ops pppoe_chan_ops; - -static inline int cmp_2_addr(struct pppoe_addr *a, struct pppoe_addr *b) -{ - return (a->sid == b->sid && - (memcmp(a->remote, b->remote, ETH_ALEN) == 0)); -} - -static inline int cmp_addr(struct pppoe_addr *a, __be16 sid, char *addr) -{ - return (a->sid == sid && - (memcmp(a->remote,addr,ETH_ALEN) == 0)); -} - -#if 8%PPPOE_HASH_BITS -#error 8 must be a multiple of PPPOE_HASH_BITS -#endif - -static int hash_item(__be16 sid, unsigned char *addr) -{ - unsigned char hash = 0; - unsigned int i; - - for (i = 0 ; i < ETH_ALEN ; i++) { - hash ^= addr[i]; - } - for (i = 0 ; i < sizeof(sid_t)*8 ; i += 8 ){ - hash ^= (__force __u32)sid>>i; - } - for (i = 8 ; (i>>=1) >= PPPOE_HASH_BITS ; ) { - hash ^= hash>>i; - } - - return hash & ( PPPOE_HASH_SIZE - 1 ); -} - -/* zeroed because its in .bss */ -static struct pppox_sock *item_hash_table[PPPOE_HASH_SIZE]; - -/********************************************************************** - * - * Set/get/delete/rehash items (internal versions) - * - **********************************************************************/ -static struct pppox_sock *__get_item(__be16 sid, unsigned char *addr, int ifindex) -{ - int hash = hash_item(sid, addr); - struct pppox_sock *ret; - - ret = item_hash_table[hash]; - - while (ret && !(cmp_addr(&ret->pppoe_pa, sid, addr) && ret->pppoe_ifindex == ifindex)) - ret = ret->next; - - return ret; -} - -static int __set_item(struct pppox_sock *po) -{ - int hash = hash_item(po->pppoe_pa.sid, po->pppoe_pa.remote); - struct pppox_sock *ret; - - ret = item_hash_table[hash]; - while (ret) { - if (cmp_2_addr(&ret->pppoe_pa, &po->pppoe_pa) && ret->pppoe_ifindex == po->pppoe_ifindex) - return -EALREADY; - - ret = ret->next; - } - - po->next = item_hash_table[hash]; - item_hash_table[hash] = po; - - return 0; -} - -static struct pppox_sock *__delete_item(__be16 sid, char *addr, int ifindex) -{ - int hash = hash_item(sid, addr); - struct pppox_sock *ret, **src; - - ret = item_hash_table[hash]; - src = &item_hash_table[hash]; - - while (ret) { - if (cmp_addr(&ret->pppoe_pa, sid, addr) && ret->pppoe_ifindex == ifindex) { - *src = ret->next; - break; - } - - src = &ret->next; - ret = ret->next; - } - - return ret; -} - -/********************************************************************** - * - * Set/get/delete/rehash items - * - **********************************************************************/ -static inline struct pppox_sock *get_item(__be16 sid, - unsigned char *addr, int ifindex) -{ - struct pppox_sock *po; - - read_lock_bh(&pppoe_hash_lock); - po = __get_item(sid, addr, ifindex); - if (po) - sock_hold(sk_pppox(po)); - read_unlock_bh(&pppoe_hash_lock); - - return po; -} - -static inline struct pppox_sock *get_item_by_addr(struct sockaddr_pppox *sp) -{ - struct net_device *dev; - int ifindex; - - dev = dev_get_by_name(&init_net, sp->sa_addr.pppoe.dev); - if(!dev) - return NULL; - ifindex = dev->ifindex; - dev_put(dev); - return get_item(sp->sa_addr.pppoe.sid, sp->sa_addr.pppoe.remote, ifindex); -} - -static inline struct pppox_sock *delete_item(__be16 sid, char *addr, int ifindex) -{ - struct pppox_sock *ret; - - write_lock_bh(&pppoe_hash_lock); - ret = __delete_item(sid, addr, ifindex); - write_unlock_bh(&pppoe_hash_lock); - - return ret; -} - - - -/*************************************************************************** - * - * Handler for device events. - * Certain device events require that sockets be unconnected. - * - **************************************************************************/ - -static void pppoe_flush_dev(struct net_device *dev) -{ - int hash; - BUG_ON(dev == NULL); - - write_lock_bh(&pppoe_hash_lock); - for (hash = 0; hash < PPPOE_HASH_SIZE; hash++) { - struct pppox_sock *po = item_hash_table[hash]; - - while (po != NULL) { - struct sock *sk = sk_pppox(po); - if (po->pppoe_dev != dev) { - po = po->next; - continue; - } - po->pppoe_dev = NULL; - dev_put(dev); - - - /* We always grab the socket lock, followed by the - * pppoe_hash_lock, in that order. Since we should - * hold the sock lock while doing any unbinding, - * we need to release the lock we're holding. - * Hold a reference to the sock so it doesn't disappear - * as we're jumping between locks. - */ - - sock_hold(sk); - - write_unlock_bh(&pppoe_hash_lock); - lock_sock(sk); - - if (sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND)) { - pppox_unbind_sock(sk); - sk->sk_state = PPPOX_ZOMBIE; - sk->sk_state_change(sk); - } - - release_sock(sk); - sock_put(sk); - - /* Restart scan at the beginning of this hash chain. - * While the lock was dropped the chain contents may - * have changed. - */ - write_lock_bh(&pppoe_hash_lock); - po = item_hash_table[hash]; - } - } - write_unlock_bh(&pppoe_hash_lock); -} - -static int pppoe_device_event(struct notifier_block *this, - unsigned long event, void *ptr) -{ - struct net_device *dev = (struct net_device *) ptr; - - if (dev->nd_net != &init_net) - return NOTIFY_DONE; - - /* Only look at sockets that are using this specific device. */ - switch (event) { - case NETDEV_CHANGEMTU: - /* A change in mtu is a bad thing, requiring - * LCP re-negotiation. - */ - - case NETDEV_GOING_DOWN: - case NETDEV_DOWN: - /* Find every socket on this device and kill it. */ - pppoe_flush_dev(dev); - break; - - default: - break; - }; - - return NOTIFY_DONE; -} - - -static struct notifier_block pppoe_notifier = { - .notifier_call = pppoe_device_event, -}; - - -/************************************************************************ - * - * Do the real work of receiving a PPPoE Session frame. - * - ***********************************************************************/ -static int pppoe_rcv_core(struct sock *sk, struct sk_buff *skb) -{ - struct pppox_sock *po = pppox_sk(sk); - struct pppox_sock *relay_po; - - if (sk->sk_state & PPPOX_BOUND) { - struct pppoe_hdr *ph = pppoe_hdr(skb); - int len = ntohs(ph->length); - skb_pull_rcsum(skb, sizeof(struct pppoe_hdr)); - if (pskb_trim_rcsum(skb, len)) - goto abort_kfree; - - ppp_input(&po->chan, skb); - } else if (sk->sk_state & PPPOX_RELAY) { - relay_po = get_item_by_addr(&po->pppoe_relay); - - if (relay_po == NULL) - goto abort_kfree; - - if ((sk_pppox(relay_po)->sk_state & PPPOX_CONNECTED) == 0) - goto abort_put; - - skb_pull(skb, sizeof(struct pppoe_hdr)); - if (!__pppoe_xmit(sk_pppox(relay_po), skb)) - goto abort_put; - } else { - if (sock_queue_rcv_skb(sk, skb)) - goto abort_kfree; - } - - return NET_RX_SUCCESS; - -abort_put: - sock_put(sk_pppox(relay_po)); - -abort_kfree: - kfree_skb(skb); - return NET_RX_DROP; -} - -/************************************************************************ - * - * Receive wrapper called in BH context. - * - ***********************************************************************/ -static int pppoe_rcv(struct sk_buff *skb, - struct net_device *dev, - struct packet_type *pt, - struct net_device *orig_dev) - -{ - struct pppoe_hdr *ph; - struct pppox_sock *po; - - if (!(skb = skb_share_check(skb, GFP_ATOMIC))) - goto out; - - if (dev->nd_net != &init_net) - goto drop; - - if (!pskb_may_pull(skb, sizeof(struct pppoe_hdr))) - goto drop; - - ph = pppoe_hdr(skb); - - po = get_item(ph->sid, eth_hdr(skb)->h_source, dev->ifindex); - if (po != NULL) - return sk_receive_skb(sk_pppox(po), skb, 0); -drop: - kfree_skb(skb); -out: - return NET_RX_DROP; -} - -/************************************************************************ - * - * Receive a PPPoE Discovery frame. - * This is solely for detection of PADT frames - * - ***********************************************************************/ -static int pppoe_disc_rcv(struct sk_buff *skb, - struct net_device *dev, - struct packet_type *pt, - struct net_device *orig_dev) - -{ - struct pppoe_hdr *ph; - struct pppox_sock *po; - - if (dev->nd_net != &init_net) - goto abort; - - if (!pskb_may_pull(skb, sizeof(struct pppoe_hdr))) - goto abort; - - if (!(skb = skb_share_check(skb, GFP_ATOMIC))) - goto out; - - ph = pppoe_hdr(skb); - if (ph->code != PADT_CODE) - goto abort; - - po = get_item(ph->sid, eth_hdr(skb)->h_source, dev->ifindex); - if (po) { - struct sock *sk = sk_pppox(po); - - bh_lock_sock(sk); - - /* If the user has locked the socket, just ignore - * the packet. With the way two rcv protocols hook into - * one socket family type, we cannot (easily) distinguish - * what kind of SKB it is during backlog rcv. - */ - if (sock_owned_by_user(sk) == 0) { - /* We're no longer connect at the PPPOE layer, - * and must wait for ppp channel to disconnect us. - */ - sk->sk_state = PPPOX_ZOMBIE; - } - - bh_unlock_sock(sk); - sock_put(sk); - } - -abort: - kfree_skb(skb); -out: - return NET_RX_SUCCESS; /* Lies... :-) */ -} - -static struct packet_type pppoes_ptype = { - .type = __constant_htons(ETH_P_PPP_SES), - .func = pppoe_rcv, -}; - -static struct packet_type pppoed_ptype = { - .type = __constant_htons(ETH_P_PPP_DISC), - .func = pppoe_disc_rcv, -}; - -static struct proto pppoe_sk_proto = { - .name = "PPPOE", - .owner = THIS_MODULE, - .obj_size = sizeof(struct pppox_sock), -}; - -/*********************************************************************** - * - * Initialize a new struct sock. - * - **********************************************************************/ -static int pppoe_create(struct net *net, struct socket *sock) -{ - int error = -ENOMEM; - struct sock *sk; - - sk = sk_alloc(net, PF_PPPOX, GFP_KERNEL, &pppoe_sk_proto); - if (!sk) - goto out; - - sock_init_data(sock, sk); - - sock->state = SS_UNCONNECTED; - sock->ops = &pppoe_ops; - - sk->sk_backlog_rcv = pppoe_rcv_core; - sk->sk_state = PPPOX_NONE; - sk->sk_type = SOCK_STREAM; - sk->sk_family = PF_PPPOX; - sk->sk_protocol = PX_PROTO_OE; - - error = 0; -out: return error; -} - -static int pppoe_release(struct socket *sock) -{ - struct sock *sk = sock->sk; - struct pppox_sock *po; - - if (!sk) - return 0; - - lock_sock(sk); - if (sock_flag(sk, SOCK_DEAD)){ - release_sock(sk); - return -EBADF; - } - - pppox_unbind_sock(sk); - - /* Signal the death of the socket. */ - sk->sk_state = PPPOX_DEAD; - - - /* Write lock on hash lock protects the entire "po" struct from - * concurrent updates via pppoe_flush_dev. The "po" struct should - * be considered part of the hash table contents, thus protected - * by the hash table lock */ - write_lock_bh(&pppoe_hash_lock); - - po = pppox_sk(sk); - if (po->pppoe_pa.sid) { - __delete_item(po->pppoe_pa.sid, - po->pppoe_pa.remote, po->pppoe_ifindex); - } - - if (po->pppoe_dev) { - dev_put(po->pppoe_dev); - po->pppoe_dev = NULL; - } - - write_unlock_bh(&pppoe_hash_lock); - - sock_orphan(sk); - sock->sk = NULL; - - skb_queue_purge(&sk->sk_receive_queue); - release_sock(sk); - sock_put(sk); - - return 0; -} - - -static int pppoe_connect(struct socket *sock, struct sockaddr *uservaddr, - int sockaddr_len, int flags) -{ - struct sock *sk = sock->sk; - struct net_device *dev; - struct sockaddr_pppox *sp = (struct sockaddr_pppox *) uservaddr; - struct pppox_sock *po = pppox_sk(sk); - int error; - - lock_sock(sk); - - error = -EINVAL; - if (sp->sa_protocol != PX_PROTO_OE) - goto end; - - /* Check for already bound sockets */ - error = -EBUSY; - if ((sk->sk_state & PPPOX_CONNECTED) && sp->sa_addr.pppoe.sid) - goto end; - - /* Check for already disconnected sockets, on attempts to disconnect */ - error = -EALREADY; - if ((sk->sk_state & PPPOX_DEAD) && !sp->sa_addr.pppoe.sid ) - goto end; - - error = 0; - if (po->pppoe_pa.sid) { - pppox_unbind_sock(sk); - - /* Delete the old binding */ - delete_item(po->pppoe_pa.sid,po->pppoe_pa.remote,po->pppoe_ifindex); - - if(po->pppoe_dev) - dev_put(po->pppoe_dev); - - memset(sk_pppox(po) + 1, 0, - sizeof(struct pppox_sock) - sizeof(struct sock)); - - sk->sk_state = PPPOX_NONE; - } - - /* Don't re-bind if sid==0 */ - if (sp->sa_addr.pppoe.sid != 0) { - dev = dev_get_by_name(&init_net, sp->sa_addr.pppoe.dev); - - error = -ENODEV; - if (!dev) - goto end; - - po->pppoe_dev = dev; - po->pppoe_ifindex = dev->ifindex; - - write_lock_bh(&pppoe_hash_lock); - if (!(dev->flags & IFF_UP)){ - write_unlock_bh(&pppoe_hash_lock); - goto err_put; - } - - memcpy(&po->pppoe_pa, - &sp->sa_addr.pppoe, - sizeof(struct pppoe_addr)); - - error = __set_item(po); - write_unlock_bh(&pppoe_hash_lock); - if (error < 0) - goto err_put; - - po->chan.hdrlen = (sizeof(struct pppoe_hdr) + - dev->hard_header_len); - - po->chan.mtu = dev->mtu - sizeof(struct pppoe_hdr); - po->chan.private = sk; - po->chan.ops = &pppoe_chan_ops; - - error = ppp_register_channel(&po->chan); - if (error) - goto err_put; - - sk->sk_state = PPPOX_CONNECTED; - } - - po->num = sp->sa_addr.pppoe.sid; - - end: - release_sock(sk); - return error; -err_put: - if (po->pppoe_dev) { - dev_put(po->pppoe_dev); - po->pppoe_dev = NULL; - } - goto end; -} - - -static int pppoe_getname(struct socket *sock, struct sockaddr *uaddr, - int *usockaddr_len, int peer) -{ - int len = sizeof(struct sockaddr_pppox); - struct sockaddr_pppox sp; - - sp.sa_family = AF_PPPOX; - sp.sa_protocol = PX_PROTO_OE; - memcpy(&sp.sa_addr.pppoe, &pppox_sk(sock->sk)->pppoe_pa, - sizeof(struct pppoe_addr)); - - memcpy(uaddr, &sp, len); - - *usockaddr_len = len; - - return 0; -} - - -static int pppoe_ioctl(struct socket *sock, unsigned int cmd, - unsigned long arg) -{ - struct sock *sk = sock->sk; - struct pppox_sock *po = pppox_sk(sk); - int val; - int err; - - switch (cmd) { - case PPPIOCGMRU: - err = -ENXIO; - - if (!(sk->sk_state & PPPOX_CONNECTED)) - break; - - err = -EFAULT; - if (put_user(po->pppoe_dev->mtu - - sizeof(struct pppoe_hdr) - - PPP_HDRLEN, - (int __user *) arg)) - break; - err = 0; - break; - - case PPPIOCSMRU: - err = -ENXIO; - if (!(sk->sk_state & PPPOX_CONNECTED)) - break; - - err = -EFAULT; - if (get_user(val,(int __user *) arg)) - break; - - if (val < (po->pppoe_dev->mtu - - sizeof(struct pppoe_hdr) - - PPP_HDRLEN)) - err = 0; - else - err = -EINVAL; - break; - - case PPPIOCSFLAGS: - err = -EFAULT; - if (get_user(val, (int __user *) arg)) - break; - err = 0; - break; - - case PPPOEIOCSFWD: - { - struct pppox_sock *relay_po; - - err = -EBUSY; - if (sk->sk_state & (PPPOX_BOUND | PPPOX_ZOMBIE | PPPOX_DEAD)) - break; - - err = -ENOTCONN; - if (!(sk->sk_state & PPPOX_CONNECTED)) - break; - - /* PPPoE address from the user specifies an outbound - PPPoE address which frames are forwarded to */ - err = -EFAULT; - if (copy_from_user(&po->pppoe_relay, - (void __user *)arg, - sizeof(struct sockaddr_pppox))) - break; - - err = -EINVAL; - if (po->pppoe_relay.sa_family != AF_PPPOX || - po->pppoe_relay.sa_protocol!= PX_PROTO_OE) - break; - - /* Check that the socket referenced by the address - actually exists. */ - relay_po = get_item_by_addr(&po->pppoe_relay); - - if (!relay_po) - break; - - sock_put(sk_pppox(relay_po)); - sk->sk_state |= PPPOX_RELAY; - err = 0; - break; - } - - case PPPOEIOCDFWD: - err = -EALREADY; - if (!(sk->sk_state & PPPOX_RELAY)) - break; - - sk->sk_state &= ~PPPOX_RELAY; - err = 0; - break; - - default: - err = -ENOTTY; - } - - return err; -} - - -static int pppoe_sendmsg(struct kiocb *iocb, struct socket *sock, - struct msghdr *m, size_t total_len) -{ - struct sk_buff *skb; - struct sock *sk = sock->sk; - struct pppox_sock *po = pppox_sk(sk); - int error; - struct pppoe_hdr hdr; - struct pppoe_hdr *ph; - struct net_device *dev; - char *start; - - lock_sock(sk); - if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED)) { - error = -ENOTCONN; - goto end; - } - - hdr.ver = 1; - hdr.type = 1; - hdr.code = 0; - hdr.sid = po->num; - - dev = po->pppoe_dev; - - error = -EMSGSIZE; - if (total_len > (dev->mtu + dev->hard_header_len)) - goto end; - - - skb = sock_wmalloc(sk, total_len + dev->hard_header_len + 32, - 0, GFP_KERNEL); - if (!skb) { - error = -ENOMEM; - goto end; - } - - /* Reserve space for headers. */ - skb_reserve(skb, dev->hard_header_len); - skb_reset_network_header(skb); - - skb->dev = dev; - - skb->priority = sk->sk_priority; - skb->protocol = __constant_htons(ETH_P_PPP_SES); - - ph = (struct pppoe_hdr *) skb_put(skb, total_len + sizeof(struct pppoe_hdr)); - start = (char *) &ph->tag[0]; - - error = memcpy_fromiovec(start, m->msg_iov, total_len); - - if (error < 0) { - kfree_skb(skb); - goto end; - } - - error = total_len; - dev_hard_header(skb, dev, ETH_P_PPP_SES, - po->pppoe_pa.remote, NULL, total_len); - - memcpy(ph, &hdr, sizeof(struct pppoe_hdr)); - - ph->length = htons(total_len); - - dev_queue_xmit(skb); - -end: - release_sock(sk); - return error; -} - - -/************************************************************************ - * - * xmit function for internal use. - * - ***********************************************************************/ -static int __pppoe_xmit(struct sock *sk, struct sk_buff *skb) -{ - struct pppox_sock *po = pppox_sk(sk); - struct net_device *dev = po->pppoe_dev; - struct pppoe_hdr *ph; - int data_len = skb->len; - - if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED)) - goto abort; - - if (!dev) - goto abort; - - /* Copy the data if there is no space for the header or if it's - * read-only. - */ - if (skb_cow_head(skb, sizeof(*ph) + dev->hard_header_len)) - goto abort; - - __skb_push(skb, sizeof(*ph)); - skb_reset_network_header(skb); - - ph = pppoe_hdr(skb); - ph->ver = 1; - ph->type = 1; - ph->code = 0; - ph->sid = po->num; - ph->length = htons(data_len); - - skb->protocol = __constant_htons(ETH_P_PPP_SES); - skb->dev = dev; - - dev_hard_header(skb, dev, ETH_P_PPP_SES, - po->pppoe_pa.remote, NULL, data_len); - - dev_queue_xmit(skb); - - return 1; - -abort: - kfree_skb(skb); - return 1; -} - - -/************************************************************************ - * - * xmit function called by generic PPP driver - * sends PPP frame over PPPoE socket - * - ***********************************************************************/ -static int pppoe_xmit(struct ppp_channel *chan, struct sk_buff *skb) -{ - struct sock *sk = (struct sock *) chan->private; - return __pppoe_xmit(sk, skb); -} - - -static struct ppp_channel_ops pppoe_chan_ops = { - .start_xmit = pppoe_xmit, -}; - -static int pppoe_recvmsg(struct kiocb *iocb, struct socket *sock, - struct msghdr *m, size_t total_len, int flags) -{ - struct sock *sk = sock->sk; - struct sk_buff *skb; - int error = 0; - - if (sk->sk_state & PPPOX_BOUND) { - error = -EIO; - goto end; - } - - skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, - flags & MSG_DONTWAIT, &error); - - if (error < 0) - goto end; - - m->msg_namelen = 0; - - if (skb) { - struct pppoe_hdr *ph = pppoe_hdr(skb); - const int len = ntohs(ph->length); - - error = memcpy_toiovec(m->msg_iov, (unsigned char *) &ph->tag[0], len); - if (error == 0) - error = len; - } - - kfree_skb(skb); -end: - return error; -} - -#ifdef CONFIG_PROC_FS -static int pppoe_seq_show(struct seq_file *seq, void *v) -{ - struct pppox_sock *po; - char *dev_name; - DECLARE_MAC_BUF(mac); - - if (v == SEQ_START_TOKEN) { - seq_puts(seq, "Id Address Device\n"); - goto out; - } - - po = v; - dev_name = po->pppoe_pa.dev; - - seq_printf(seq, "%08X %s %8s\n", - po->pppoe_pa.sid, print_mac(mac, po->pppoe_pa.remote), dev_name); -out: - return 0; -} - -static __inline__ struct pppox_sock *pppoe_get_idx(loff_t pos) -{ - struct pppox_sock *po; - int i = 0; - - for (; i < PPPOE_HASH_SIZE; i++) { - po = item_hash_table[i]; - while (po) { - if (!pos--) - goto out; - po = po->next; - } - } -out: - return po; -} - -static void *pppoe_seq_start(struct seq_file *seq, loff_t *pos) - __acquires(pppoe_hash_lock) -{ - loff_t l = *pos; - - read_lock_bh(&pppoe_hash_lock); - return l ? pppoe_get_idx(--l) : SEQ_START_TOKEN; -} - -static void *pppoe_seq_next(struct seq_file *seq, void *v, loff_t *pos) -{ - struct pppox_sock *po; - - ++*pos; - if (v == SEQ_START_TOKEN) { - po = pppoe_get_idx(0); - goto out; - } - po = v; - if (po->next) - po = po->next; - else { - int hash = hash_item(po->pppoe_pa.sid, po->pppoe_pa.remote); - - while (++hash < PPPOE_HASH_SIZE) { - po = item_hash_table[hash]; - if (po) - break; - } - } -out: - return po; -} - -static void pppoe_seq_stop(struct seq_file *seq, void *v) - __releases(pppoe_hash_lock) -{ - read_unlock_bh(&pppoe_hash_lock); -} - -static struct seq_operations pppoe_seq_ops = { - .start = pppoe_seq_start, - .next = pppoe_seq_next, - .stop = pppoe_seq_stop, - .show = pppoe_seq_show, -}; - -static int pppoe_seq_open(struct inode *inode, struct file *file) -{ - return seq_open(file, &pppoe_seq_ops); -} - -static const struct file_operations pppoe_seq_fops = { - .owner = THIS_MODULE, - .open = pppoe_seq_open, - .read = seq_read, - .llseek = seq_lseek, - .release = seq_release, -}; - -static int __init pppoe_proc_init(void) -{ - struct proc_dir_entry *p; - - p = create_proc_entry("pppoe", S_IRUGO, init_net.proc_net); - if (!p) - return -ENOMEM; - - p->proc_fops = &pppoe_seq_fops; - return 0; -} -#else /* CONFIG_PROC_FS */ -static inline int pppoe_proc_init(void) { return 0; } -#endif /* CONFIG_PROC_FS */ - -static const struct proto_ops pppoe_ops = { - .family = AF_PPPOX, - .owner = THIS_MODULE, - .release = pppoe_release, - .bind = sock_no_bind, - .connect = pppoe_connect, - .socketpair = sock_no_socketpair, - .accept = sock_no_accept, - .getname = pppoe_getname, - .poll = datagram_poll, - .listen = sock_no_listen, - .shutdown = sock_no_shutdown, - .setsockopt = sock_no_setsockopt, - .getsockopt = sock_no_getsockopt, - .sendmsg = pppoe_sendmsg, - .recvmsg = pppoe_recvmsg, - .mmap = sock_no_mmap, - .ioctl = pppox_ioctl, -}; - -static struct pppox_proto pppoe_proto = { - .create = pppoe_create, - .ioctl = pppoe_ioctl, - .owner = THIS_MODULE, -}; - - -static int __init pppoe_init(void) -{ - int err = proto_register(&pppoe_sk_proto, 0); - - if (err) - goto out; - - err = register_pppox_proto(PX_PROTO_OE, &pppoe_proto); - if (err) - goto out_unregister_pppoe_proto; - - err = pppoe_proc_init(); - if (err) - goto out_unregister_pppox_proto; - - dev_add_pack(&pppoes_ptype); - dev_add_pack(&pppoed_ptype); - register_netdevice_notifier(&pppoe_notifier); -out: - return err; -out_unregister_pppox_proto: - unregister_pppox_proto(PX_PROTO_OE); -out_unregister_pppoe_proto: - proto_unregister(&pppoe_sk_proto); - goto out; -} - -static void __exit pppoe_exit(void) -{ - unregister_pppox_proto(PX_PROTO_OE); - dev_remove_pack(&pppoes_ptype); - dev_remove_pack(&pppoed_ptype); - unregister_netdevice_notifier(&pppoe_notifier); - remove_proc_entry("pppoe", init_net.proc_net); - proto_unregister(&pppoe_sk_proto); -} - -module_init(pppoe_init); -module_exit(pppoe_exit); - -MODULE_AUTHOR("Michal Ostrowski <mostrows@speakeasy.net>"); -MODULE_DESCRIPTION("PPP over Ethernet driver"); -MODULE_LICENSE("GPL"); -MODULE_ALIAS_NETPROTO(PF_PPPOX); |