diff options
Diffstat (limited to 'drivers/net/pppoe.c')
| -rw-r--r-- | drivers/net/pppoe.c | 1153 |
1 files changed, 1153 insertions, 0 deletions
diff --git a/drivers/net/pppoe.c b/drivers/net/pppoe.c new file mode 100644 index 0000000..ce1a9bf --- /dev/null +++ b/drivers/net/pppoe.c @@ -0,0 +1,1153 @@ +/** -*- 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 + * + * 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/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 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, unsigned long sid, char *addr) +{ + return (a->sid == sid && + (memcmp(a->remote,addr,ETH_ALEN) == 0)); +} + +static int hash_item(unsigned long sid, unsigned char *addr) +{ + char hash = 0; + int i, j; + + for (i = 0; i < ETH_ALEN ; ++i) { + for (j = 0; j < 8/PPPOE_HASH_BITS ; ++j) { + hash ^= addr[i] >> ( j * PPPOE_HASH_BITS ); + } + } + + for (i = 0; i < (sizeof(unsigned long)*8) / PPPOE_HASH_BITS ; ++i) + hash ^= sid >> (i*PPPOE_HASH_BITS); + + 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(unsigned long sid, unsigned char *addr) +{ + 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 = 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)) + return -EALREADY; + + ret = ret->next; + } + + if (!ret) { + po->next = item_hash_table[hash]; + item_hash_table[hash] = po; + } + + return 0; +} + +static struct pppox_sock *__delete_item(unsigned long sid, char *addr) +{ + 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)) { + *src = ret->next; + break; + } + + src = &ret->next; + ret = ret->next; + } + + return ret; +} + +/********************************************************************** + * + * Set/get/delete/rehash items + * + **********************************************************************/ +static inline struct pppox_sock *get_item(unsigned long sid, + unsigned char *addr) +{ + struct pppox_sock *po; + + read_lock_bh(&pppoe_hash_lock); + po = __get_item(sid, addr); + 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) +{ + return get_item(sp->sa_addr.pppoe.sid, sp->sa_addr.pppoe.remote); +} + +static inline int set_item(struct pppox_sock *po) +{ + int i; + + if (!po) + return -EINVAL; + + write_lock_bh(&pppoe_hash_lock); + i = __set_item(po); + write_unlock_bh(&pppoe_hash_lock); + + return i; +} + +static inline struct pppox_sock *delete_item(unsigned long sid, char *addr) +{ + struct pppox_sock *ret; + + write_lock_bh(&pppoe_hash_lock); + ret = __delete_item(sid, addr); + 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); + + read_lock_bh(&pppoe_hash_lock); + for (hash = 0; hash < PPPOE_HASH_SIZE; hash++) { + struct pppox_sock *po = item_hash_table[hash]; + + while (po != NULL) { + if (po->pppoe_dev == dev) { + struct sock *sk = sk_pppox(po); + + sock_hold(sk); + po->pppoe_dev = NULL; + + /* We hold a reference to SK, now drop the + * hash table lock so that we may attempt + * to lock the socket (which can sleep). + */ + read_unlock_bh(&pppoe_hash_lock); + + lock_sock(sk); + + if (sk->sk_state & + (PPPOX_CONNECTED | PPPOX_BOUND)) { + pppox_unbind_sock(sk); + dev_put(dev); + sk->sk_state = PPPOX_ZOMBIE; + sk->sk_state_change(sk); + } + + release_sock(sk); + + sock_put(sk); + + read_lock_bh(&pppoe_hash_lock); + + /* Now restart from the beginning of this + * hash chain. We always NULL out pppoe_dev + * so we are guaranteed to make forward + * progress. + */ + po = item_hash_table[hash]; + continue; + } + po = po->next; + } + } + read_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; + + /* 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 = NULL; + + if (sk->sk_state & PPPOX_BOUND) { + struct pppoe_hdr *ph = (struct pppoe_hdr *) skb->nh.raw; + int len = ntohs(ph->length); + skb_pull(skb, sizeof(struct pppoe_hdr)); + skb_postpull_rcsum(skb, ph, sizeof(*ph)); + 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 pppoe_hdr *ph; + struct pppox_sock *po; + struct sock *sk; + int ret; + + if (!pskb_may_pull(skb, sizeof(struct pppoe_hdr))) + goto drop; + + if (!(skb = skb_share_check(skb, GFP_ATOMIC))) + goto out; + + ph = (struct pppoe_hdr *) skb->nh.raw; + + po = get_item((unsigned long) ph->sid, eth_hdr(skb)->h_source); + if (!po) + goto drop; + + sk = sk_pppox(po); + bh_lock_sock(sk); + + /* Socket state is unknown, must put skb into backlog. */ + if (sock_owned_by_user(sk) != 0) { + sk_add_backlog(sk, skb); + ret = NET_RX_SUCCESS; + } else { + ret = pppoe_rcv_core(sk, skb); + } + + bh_unlock_sock(sk); + sock_put(sk); + + return ret; +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 pppoe_hdr *ph; + struct pppox_sock *po; + + if (!pskb_may_pull(skb, sizeof(struct pppoe_hdr))) + goto abort; + + if (!(skb = skb_share_check(skb, GFP_ATOMIC))) + goto out; + + ph = (struct pppoe_hdr *) skb->nh.raw; + if (ph->code != PADT_CODE) + goto abort; + + po = get_item((unsigned long) ph->sid, eth_hdr(skb)->h_source); + 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 socket *sock) +{ + int error = -ENOMEM; + struct sock *sk; + + sk = sk_alloc(PF_PPPOX, GFP_KERNEL, &pppoe_sk_proto, 1); + 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; + int error = 0; + + if (!sk) + return 0; + + if (sock_flag(sk, SOCK_DEAD)) + return -EBADF; + + pppox_unbind_sock(sk); + + /* Signal the death of the socket. */ + sk->sk_state = PPPOX_DEAD; + + po = pppox_sk(sk); + if (po->pppoe_pa.sid) { + delete_item(po->pppoe_pa.sid, po->pppoe_pa.remote); + } + + if (po->pppoe_dev) + dev_put(po->pppoe_dev); + + po->pppoe_dev = NULL; + + sock_orphan(sk); + sock->sk = NULL; + + skb_queue_purge(&sk->sk_receive_queue); + sock_put(sk); + + return error; +} + + +static int pppoe_connect(struct socket *sock, struct sockaddr *uservaddr, + int sockaddr_len, int flags) +{ + struct sock *sk = sock->sk; + struct net_device *dev = NULL; + 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); + + 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(sp->sa_addr.pppoe.dev); + + error = -ENODEV; + if (!dev) + goto end; + + po->pppoe_dev = dev; + + if (!(dev->flags & IFF_UP)) + goto err_put; + + memcpy(&po->pppoe_pa, + &sp->sa_addr.pppoe, + sizeof(struct pppoe_addr)); + + error = set_item(po); + if (error < 0) + goto err_put; + + po->chan.hdrlen = (sizeof(struct pppoe_hdr) + + dev->hard_header_len); + + 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 = 0; + int err = 0; + + 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 to 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:; + }; + + return err; +} + + +static int pppoe_sendmsg(struct kiocb *iocb, struct socket *sock, + struct msghdr *m, size_t total_len) +{ + struct sk_buff *skb = NULL; + struct sock *sk = sock->sk; + struct pppox_sock *po = pppox_sk(sk); + int error = 0; + struct pppoe_hdr hdr; + struct pppoe_hdr *ph; + struct net_device *dev; + char *start; + + 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; + + lock_sock(sk); + + 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->nh.raw = skb->data; + + 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 hdr; + struct pppoe_hdr *ph; + int headroom = skb_headroom(skb); + int data_len = skb->len; + struct sk_buff *skb2; + + if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED)) + goto abort; + + hdr.ver = 1; + hdr.type = 1; + hdr.code = 0; + hdr.sid = po->num; + hdr.length = htons(skb->len); + + if (!dev) + goto abort; + + /* Copy the skb if there is no space for the header. */ + if (headroom < (sizeof(struct pppoe_hdr) + dev->hard_header_len)) { + skb2 = dev_alloc_skb(32+skb->len + + sizeof(struct pppoe_hdr) + + dev->hard_header_len); + + if (skb2 == NULL) + goto abort; + + skb_reserve(skb2, dev->hard_header_len + sizeof(struct pppoe_hdr)); + memcpy(skb_put(skb2, skb->len), skb->data, skb->len); + } else { + /* Make a clone so as to not disturb the original skb, + * give dev_queue_xmit something it can free. + */ + skb2 = skb_clone(skb, GFP_ATOMIC); + } + + ph = (struct pppoe_hdr *) skb_push(skb2, sizeof(struct pppoe_hdr)); + memcpy(ph, &hdr, sizeof(struct pppoe_hdr)); + skb2->protocol = __constant_htons(ETH_P_PPP_SES); + + skb2->nh.raw = skb2->data; + + skb2->dev = dev; + + dev->hard_header(skb2, dev, ETH_P_PPP_SES, + po->pppoe_pa.remote, NULL, data_len); + + /* We're transmitting skb2, and assuming that dev_queue_xmit + * will free it. The generic ppp layer however, is expecting + * that we give back 'skb' (not 'skb2') in case of failure, + * but free it in case of success. + */ + + if (dev_queue_xmit(skb2) < 0) + goto abort; + + kfree_skb(skb); + return 1; + +abort: + return 0; +} + + +/************************************************************************ + * + * 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 = NULL; + int error = 0; + int len; + struct pppoe_hdr *ph = NULL; + + 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) { + error = 0; + ph = (struct pppoe_hdr *) skb->nh.raw; + len = ntohs(ph->length); + + error = memcpy_toiovec(m->msg_iov, (unsigned char *) &ph->tag[0], len); + if (error < 0) + goto do_skb_free; + error = len; + } + +do_skb_free: + if (skb) + 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; + + 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 %02X:%02X:%02X:%02X:%02X:%02X %8s\n", + po->pppoe_pa.sid, + po->pppoe_pa.remote[0], po->pppoe_pa.remote[1], + po->pppoe_pa.remote[2], po->pppoe_pa.remote[3], + po->pppoe_pa.remote[4], po->pppoe_pa.remote[5], dev_name); +out: + return 0; +} + +static __inline__ struct pppox_sock *pppoe_get_idx(loff_t pos) +{ + struct pppox_sock *po = NULL; + 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) +{ + 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) +{ + 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 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, 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 */ + +/* ->ioctl are set at pppox_create */ + +static 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 +}; + +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", 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); |
