6f30e1867c
Otherwise we can potentially try to dereference a NULL device pointer in some cases. Signed-off-by: David S. Miller <davem@davemloft.net>
177 lines
5.1 KiB
C
177 lines
5.1 KiB
C
/***************************************************************************
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* Linux PPP over X - Generic PPP transport layer sockets
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* Linux PPP over Ethernet (PPPoE) Socket Implementation (RFC 2516)
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*
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* This file supplies definitions required by the PPP over Ethernet driver
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* (pppox.c). All version information wrt this file is located in pppox.c
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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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#ifndef __LINUX_IF_PPPOX_H
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#define __LINUX_IF_PPPOX_H
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#include <asm/types.h>
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#include <asm/byteorder.h>
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#ifdef __KERNEL__
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#include <linux/if_ether.h>
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#include <linux/if.h>
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#include <linux/netdevice.h>
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#include <asm/semaphore.h>
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#include <linux/ppp_channel.h>
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#endif /* __KERNEL__ */
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/* For user-space programs to pick up these definitions
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* which they wouldn't get otherwise without defining __KERNEL__
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*/
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#ifndef AF_PPPOX
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#define AF_PPPOX 24
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#define PF_PPPOX AF_PPPOX
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#endif /* !(AF_PPPOX) */
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/************************************************************************
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* PPPoE addressing definition
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*/
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typedef __u16 sid_t;
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struct pppoe_addr{
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sid_t sid; /* Session identifier */
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unsigned char remote[ETH_ALEN]; /* Remote address */
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char dev[IFNAMSIZ]; /* Local device to use */
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};
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/************************************************************************
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* Protocols supported by AF_PPPOX
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*/
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#define PX_PROTO_OE 0 /* Currently just PPPoE */
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#define PX_MAX_PROTO 1
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struct sockaddr_pppox {
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sa_family_t sa_family; /* address family, AF_PPPOX */
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unsigned int sa_protocol; /* protocol identifier */
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union{
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struct pppoe_addr pppoe;
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}sa_addr;
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}__attribute__ ((packed));
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/*********************************************************************
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*
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* ioctl interface for defining forwarding of connections
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*
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********************************************************************/
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#define PPPOEIOCSFWD _IOW(0xB1 ,0, size_t)
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#define PPPOEIOCDFWD _IO(0xB1 ,1)
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/*#define PPPOEIOCGFWD _IOWR(0xB1,2, size_t)*/
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/* Codes to identify message types */
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#define PADI_CODE 0x09
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#define PADO_CODE 0x07
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#define PADR_CODE 0x19
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#define PADS_CODE 0x65
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#define PADT_CODE 0xa7
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struct pppoe_tag {
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__u16 tag_type;
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__u16 tag_len;
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char tag_data[0];
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} __attribute ((packed));
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/* Tag identifiers */
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#define PTT_EOL __constant_htons(0x0000)
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#define PTT_SRV_NAME __constant_htons(0x0101)
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#define PTT_AC_NAME __constant_htons(0x0102)
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#define PTT_HOST_UNIQ __constant_htons(0x0103)
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#define PTT_AC_COOKIE __constant_htons(0x0104)
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#define PTT_VENDOR __constant_htons(0x0105)
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#define PTT_RELAY_SID __constant_htons(0x0110)
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#define PTT_SRV_ERR __constant_htons(0x0201)
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#define PTT_SYS_ERR __constant_htons(0x0202)
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#define PTT_GEN_ERR __constant_htons(0x0203)
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struct pppoe_hdr {
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#if defined(__LITTLE_ENDIAN_BITFIELD)
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__u8 ver : 4;
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__u8 type : 4;
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#elif defined(__BIG_ENDIAN_BITFIELD)
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__u8 type : 4;
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__u8 ver : 4;
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#else
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#error "Please fix <asm/byteorder.h>"
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#endif
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__u8 code;
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__u16 sid;
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__u16 length;
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struct pppoe_tag tag[0];
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} __attribute__ ((packed));
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#ifdef __KERNEL__
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struct pppoe_opt {
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struct net_device *dev; /* device associated with socket*/
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int ifindex; /* ifindex of device associated with socket */
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struct pppoe_addr pa; /* what this socket is bound to*/
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struct sockaddr_pppox relay; /* what socket data will be
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relayed to (PPPoE relaying) */
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};
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#include <net/sock.h>
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struct pppox_sock {
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/* struct sock must be the first member of pppox_sock */
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struct sock sk;
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struct ppp_channel chan;
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struct pppox_sock *next; /* for hash table */
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union {
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struct pppoe_opt pppoe;
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} proto;
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unsigned short num;
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};
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#define pppoe_dev proto.pppoe.dev
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#define pppoe_ifindex proto.pppoe.ifindex
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#define pppoe_pa proto.pppoe.pa
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#define pppoe_relay proto.pppoe.relay
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static inline struct pppox_sock *pppox_sk(struct sock *sk)
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{
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return (struct pppox_sock *)sk;
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}
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static inline struct sock *sk_pppox(struct pppox_sock *po)
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{
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return (struct sock *)po;
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}
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struct module;
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struct pppox_proto {
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int (*create)(struct socket *sock);
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int (*ioctl)(struct socket *sock, unsigned int cmd,
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unsigned long arg);
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struct module *owner;
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};
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extern int register_pppox_proto(int proto_num, struct pppox_proto *pp);
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extern void unregister_pppox_proto(int proto_num);
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extern void pppox_unbind_sock(struct sock *sk);/* delete ppp-channel binding */
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extern int pppox_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg);
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/* PPPoX socket states */
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enum {
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PPPOX_NONE = 0, /* initial state */
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PPPOX_CONNECTED = 1, /* connection established ==TCP_ESTABLISHED */
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PPPOX_BOUND = 2, /* bound to ppp device */
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PPPOX_RELAY = 4, /* forwarding is enabled */
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PPPOX_ZOMBIE = 8, /* dead, but still bound to ppp device */
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PPPOX_DEAD = 16 /* dead, useless, please clean me up!*/
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};
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#endif /* __KERNEL__ */
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#endif /* !(__LINUX_IF_PPPOX_H) */
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