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055d88242a
Support for handling the PPPOEIOCSFWD ioctl in compat mode was added in
linux-2.5.69 along with hundreds of other commands, but was always broken
sincen only the structure is compatible, but the command number is not,
due to the size being sizeof(size_t), or at first sizeof(sizeof((struct
sockaddr_pppox)), which is different on 64-bit architectures.
Guillaume Nault adds:
And the implementation was broken until 2016 (see 29e73269aa ("pppoe:
fix reference counting in PPPoE proxy")), and nobody ever noticed. I
should probably have removed this ioctl entirely instead of fixing it.
Clearly, it has never been used.
Fix it by adding a compat_ioctl handler for all pppoe variants that
translates the command number and then calls the regular ioctl function.
All other ioctl commands handled by pppoe are compatible between 32-bit
and 64-bit, and require compat_ptr() conversion.
This should apply to all stable kernels.
Acked-by: Guillaume Nault <g.nault@alphalink.fr>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
97 lines
2.8 KiB
C
97 lines
2.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/***************************************************************************
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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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*/
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#ifndef __LINUX_IF_PPPOX_H
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#define __LINUX_IF_PPPOX_H
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#include <linux/if.h>
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#include <linux/netdevice.h>
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#include <linux/ppp_channel.h>
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#include <linux/skbuff.h>
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#include <linux/workqueue.h>
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#include <uapi/linux/if_pppox.h>
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static inline struct pppoe_hdr *pppoe_hdr(const struct sk_buff *skb)
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{
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return (struct pppoe_hdr *)skb_network_header(skb);
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}
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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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struct work_struct padt_work;/* Work item for handling PADT */
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};
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struct pptp_opt {
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struct pptp_addr src_addr;
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struct pptp_addr dst_addr;
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u32 ack_sent, ack_recv;
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u32 seq_sent, seq_recv;
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int ppp_flags;
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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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struct pptp_opt pptp;
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} proto;
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__be16 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 net *net, struct socket *sock, int kern);
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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, const 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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extern int pppox_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg);
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#define PPPOEIOCSFWD32 _IOW(0xB1 ,0, compat_size_t)
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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_DEAD = 16 /* dead, useless, please clean me up!*/
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};
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#endif /* !(__LINUX_IF_PPPOX_H) */
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