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![Stephen Hemminger](/assets/img/avatar_default.png)
Add inline for common usage of hardware header creation, and fix bug in IPV6 mcast where the assumption about negative return is an errno. Negative return from hard_header means not enough space was available,(ie -N bytes). Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org> Signed-off-by: David S. Miller <davem@davemloft.net>
1134 lines
25 KiB
C
1134 lines
25 KiB
C
/** -*- linux-c -*- ***********************************************************
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* Linux PPP over Ethernet (PPPoX/PPPoE) Sockets
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*
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* PPPoX --- Generic PPP encapsulation socket family
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* PPPoE --- PPP over Ethernet (RFC 2516)
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*
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*
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* Version: 0.7.0
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*
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* 070228 : Fix to allow multiple sessions with same remote MAC and same
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* session id by including the local device ifindex in the
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* tuple identifying a session. This also ensures packets can't
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* be injected into a session from interfaces other than the one
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* specified by userspace. Florian Zumbiehl <florz@florz.de>
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* (Oh, BTW, this one is YYMMDD, in case you were wondering ...)
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* 220102 : Fix module use count on failure in pppoe_create, pppox_sk -acme
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* 030700 : Fixed connect logic to allow for disconnect.
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* 270700 : Fixed potential SMP problems; we must protect against
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* simultaneous invocation of ppp_input
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* and ppp_unregister_channel.
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* 040800 : Respect reference count mechanisms on net-devices.
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* 200800 : fix kfree(skb) in pppoe_rcv (acme)
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* Module reference count is decremented in the right spot now,
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* guards against sock_put not actually freeing the sk
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* in pppoe_release.
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* 051000 : Initialization cleanup.
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* 111100 : Fix recvmsg.
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* 050101 : Fix PADT procesing.
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* 140501 : Use pppoe_rcv_core to handle all backlog. (Alexey)
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* 170701 : Do not lock_sock with rwlock held. (DaveM)
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* Ignore discovery frames if user has socket
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* locked. (DaveM)
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* Ignore return value of dev_queue_xmit in __pppoe_xmit
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* or else we may kfree an SKB twice. (DaveM)
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* 190701 : When doing copies of skb's in __pppoe_xmit, always delete
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* the original skb that was passed in on success, never on
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* failure. Delete the copy of the skb on failure to avoid
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* a memory leak.
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* 081001 : Misc. cleanup (licence string, non-blocking, prevent
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* reference of device on close).
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* 121301 : New ppp channels interface; cannot unregister a channel
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* from interrupts. Thus, we mark the socket as a ZOMBIE
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* and do the unregistration later.
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* 081002 : seq_file support for proc stuff -acme
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* 111602 : Merge all 2.4 fixes into 2.5/2.6 tree. Label 2.5/2.6
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* as version 0.7. Spacing cleanup.
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* Author: Michal Ostrowski <mostrows@speakeasy.net>
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* Contributors:
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* Arnaldo Carvalho de Melo <acme@conectiva.com.br>
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* David S. Miller (davem@redhat.com)
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*
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* License:
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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*/
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#include <linux/string.h>
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/errno.h>
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#include <linux/netdevice.h>
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#include <linux/net.h>
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#include <linux/inetdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/skbuff.h>
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#include <linux/init.h>
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#include <linux/if_ether.h>
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#include <linux/if_pppox.h>
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#include <linux/ppp_channel.h>
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#include <linux/ppp_defs.h>
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#include <linux/if_ppp.h>
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#include <linux/notifier.h>
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#include <linux/file.h>
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <net/net_namespace.h>
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#include <net/sock.h>
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#include <asm/uaccess.h>
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#define PPPOE_HASH_BITS 4
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#define PPPOE_HASH_SIZE (1<<PPPOE_HASH_BITS)
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static struct ppp_channel_ops pppoe_chan_ops;
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static int pppoe_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg);
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static int pppoe_xmit(struct ppp_channel *chan, struct sk_buff *skb);
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static int __pppoe_xmit(struct sock *sk, struct sk_buff *skb);
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static const struct proto_ops pppoe_ops;
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static DEFINE_RWLOCK(pppoe_hash_lock);
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static struct ppp_channel_ops pppoe_chan_ops;
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static inline int cmp_2_addr(struct pppoe_addr *a, struct pppoe_addr *b)
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{
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return (a->sid == b->sid &&
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(memcmp(a->remote, b->remote, ETH_ALEN) == 0));
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}
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static inline int cmp_addr(struct pppoe_addr *a, __be16 sid, char *addr)
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{
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return (a->sid == sid &&
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(memcmp(a->remote,addr,ETH_ALEN) == 0));
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}
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#if 8%PPPOE_HASH_BITS
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#error 8 must be a multiple of PPPOE_HASH_BITS
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#endif
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static int hash_item(__be16 sid, unsigned char *addr)
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{
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unsigned char hash = 0;
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unsigned int i;
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for (i = 0 ; i < ETH_ALEN ; i++) {
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hash ^= addr[i];
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}
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for (i = 0 ; i < sizeof(sid_t)*8 ; i += 8 ){
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hash ^= (__force __u32)sid>>i;
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}
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for (i = 8 ; (i>>=1) >= PPPOE_HASH_BITS ; ) {
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hash ^= hash>>i;
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}
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return hash & ( PPPOE_HASH_SIZE - 1 );
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}
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/* zeroed because its in .bss */
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static struct pppox_sock *item_hash_table[PPPOE_HASH_SIZE];
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/**********************************************************************
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*
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* Set/get/delete/rehash items (internal versions)
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*
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**********************************************************************/
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static struct pppox_sock *__get_item(__be16 sid, unsigned char *addr, int ifindex)
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{
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int hash = hash_item(sid, addr);
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struct pppox_sock *ret;
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ret = item_hash_table[hash];
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while (ret && !(cmp_addr(&ret->pppoe_pa, sid, addr) && ret->pppoe_ifindex == ifindex))
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ret = ret->next;
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return ret;
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}
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static int __set_item(struct pppox_sock *po)
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{
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int hash = hash_item(po->pppoe_pa.sid, po->pppoe_pa.remote);
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struct pppox_sock *ret;
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ret = item_hash_table[hash];
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while (ret) {
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if (cmp_2_addr(&ret->pppoe_pa, &po->pppoe_pa) && ret->pppoe_ifindex == po->pppoe_ifindex)
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return -EALREADY;
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ret = ret->next;
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}
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po->next = item_hash_table[hash];
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item_hash_table[hash] = po;
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return 0;
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}
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static struct pppox_sock *__delete_item(__be16 sid, char *addr, int ifindex)
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{
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int hash = hash_item(sid, addr);
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struct pppox_sock *ret, **src;
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ret = item_hash_table[hash];
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src = &item_hash_table[hash];
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while (ret) {
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if (cmp_addr(&ret->pppoe_pa, sid, addr) && ret->pppoe_ifindex == ifindex) {
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*src = ret->next;
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break;
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}
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src = &ret->next;
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ret = ret->next;
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}
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return ret;
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}
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/**********************************************************************
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*
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* Set/get/delete/rehash items
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*
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**********************************************************************/
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static inline struct pppox_sock *get_item(__be16 sid,
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unsigned char *addr, int ifindex)
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{
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struct pppox_sock *po;
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read_lock_bh(&pppoe_hash_lock);
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po = __get_item(sid, addr, ifindex);
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if (po)
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sock_hold(sk_pppox(po));
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read_unlock_bh(&pppoe_hash_lock);
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return po;
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}
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static inline struct pppox_sock *get_item_by_addr(struct sockaddr_pppox *sp)
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{
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struct net_device *dev;
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int ifindex;
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dev = dev_get_by_name(&init_net, sp->sa_addr.pppoe.dev);
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if(!dev)
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return NULL;
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ifindex = dev->ifindex;
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dev_put(dev);
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return get_item(sp->sa_addr.pppoe.sid, sp->sa_addr.pppoe.remote, ifindex);
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}
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static inline struct pppox_sock *delete_item(__be16 sid, char *addr, int ifindex)
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{
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struct pppox_sock *ret;
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write_lock_bh(&pppoe_hash_lock);
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ret = __delete_item(sid, addr, ifindex);
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write_unlock_bh(&pppoe_hash_lock);
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return ret;
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}
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/***************************************************************************
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*
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* Handler for device events.
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* Certain device events require that sockets be unconnected.
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*
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**************************************************************************/
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static void pppoe_flush_dev(struct net_device *dev)
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{
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int hash;
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BUG_ON(dev == NULL);
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write_lock_bh(&pppoe_hash_lock);
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for (hash = 0; hash < PPPOE_HASH_SIZE; hash++) {
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struct pppox_sock *po = item_hash_table[hash];
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while (po != NULL) {
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struct sock *sk = sk_pppox(po);
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if (po->pppoe_dev != dev) {
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po = po->next;
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continue;
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}
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po->pppoe_dev = NULL;
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dev_put(dev);
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/* We always grab the socket lock, followed by the
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* pppoe_hash_lock, in that order. Since we should
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* hold the sock lock while doing any unbinding,
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* we need to release the lock we're holding.
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* Hold a reference to the sock so it doesn't disappear
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* as we're jumping between locks.
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*/
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sock_hold(sk);
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write_unlock_bh(&pppoe_hash_lock);
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lock_sock(sk);
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if (sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND)) {
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pppox_unbind_sock(sk);
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sk->sk_state = PPPOX_ZOMBIE;
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sk->sk_state_change(sk);
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}
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release_sock(sk);
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sock_put(sk);
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/* Restart scan at the beginning of this hash chain.
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* While the lock was dropped the chain contents may
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* have changed.
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*/
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write_lock_bh(&pppoe_hash_lock);
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po = item_hash_table[hash];
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}
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}
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write_unlock_bh(&pppoe_hash_lock);
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}
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static int pppoe_device_event(struct notifier_block *this,
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unsigned long event, void *ptr)
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{
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struct net_device *dev = (struct net_device *) ptr;
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if (dev->nd_net != &init_net)
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return NOTIFY_DONE;
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/* Only look at sockets that are using this specific device. */
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switch (event) {
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case NETDEV_CHANGEMTU:
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/* A change in mtu is a bad thing, requiring
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* LCP re-negotiation.
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*/
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case NETDEV_GOING_DOWN:
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case NETDEV_DOWN:
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/* Find every socket on this device and kill it. */
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pppoe_flush_dev(dev);
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break;
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default:
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break;
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};
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return NOTIFY_DONE;
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}
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static struct notifier_block pppoe_notifier = {
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.notifier_call = pppoe_device_event,
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};
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|
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/************************************************************************
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*
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* Do the real work of receiving a PPPoE Session frame.
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*
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***********************************************************************/
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static int pppoe_rcv_core(struct sock *sk, struct sk_buff *skb)
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{
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struct pppox_sock *po = pppox_sk(sk);
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struct pppox_sock *relay_po;
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if (sk->sk_state & PPPOX_BOUND) {
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struct pppoe_hdr *ph = pppoe_hdr(skb);
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int len = ntohs(ph->length);
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skb_pull_rcsum(skb, sizeof(struct pppoe_hdr));
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if (pskb_trim_rcsum(skb, len))
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goto abort_kfree;
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ppp_input(&po->chan, skb);
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} else if (sk->sk_state & PPPOX_RELAY) {
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relay_po = get_item_by_addr(&po->pppoe_relay);
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if (relay_po == NULL)
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goto abort_kfree;
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if ((sk_pppox(relay_po)->sk_state & PPPOX_CONNECTED) == 0)
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goto abort_put;
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skb_pull(skb, sizeof(struct pppoe_hdr));
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if (!__pppoe_xmit(sk_pppox(relay_po), skb))
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goto abort_put;
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} else {
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if (sock_queue_rcv_skb(sk, skb))
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goto abort_kfree;
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}
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return NET_RX_SUCCESS;
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abort_put:
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sock_put(sk_pppox(relay_po));
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abort_kfree:
|
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kfree_skb(skb);
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return NET_RX_DROP;
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}
|
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|
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/************************************************************************
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|
*
|
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* Receive wrapper called in BH context.
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*
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***********************************************************************/
|
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static int pppoe_rcv(struct sk_buff *skb,
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struct net_device *dev,
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struct packet_type *pt,
|
|
struct net_device *orig_dev)
|
|
|
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{
|
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struct pppoe_hdr *ph;
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struct pppox_sock *po;
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|
|
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if (!(skb = skb_share_check(skb, GFP_ATOMIC)))
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goto out;
|
|
|
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if (dev->nd_net != &init_net)
|
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goto drop;
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|
|
|
if (!pskb_may_pull(skb, sizeof(struct pppoe_hdr)))
|
|
goto drop;
|
|
|
|
ph = pppoe_hdr(skb);
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|
|
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po = get_item(ph->sid, eth_hdr(skb)->h_source, dev->ifindex);
|
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if (po != NULL)
|
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return sk_receive_skb(sk_pppox(po), skb, 0);
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|
drop:
|
|
kfree_skb(skb);
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out:
|
|
return NET_RX_DROP;
|
|
}
|
|
|
|
/************************************************************************
|
|
*
|
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* Receive a PPPoE Discovery frame.
|
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* This is solely for detection of PADT frames
|
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*
|
|
***********************************************************************/
|
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static int pppoe_disc_rcv(struct sk_buff *skb,
|
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struct net_device *dev,
|
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struct packet_type *pt,
|
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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, 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;
|
|
|
|
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)
|
|
{
|
|
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 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);
|