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Message-Id: <200710131154.34988.xeb@mail.ru>
Date: Sat, 13 Oct 2007 11:54:34 +0400
From: xeb@...l.ru
To: Stephen Hemminger <shemminger@...ux-foundation.org>
Cc: netdev@...r.kernel.org
Subject: Re: Kernel panic (network stack)
> > Hello!
> > I develop network driver.
> > It works fine while less then 100 network interfaces exists.
> > Then i give kernel panic. What could cause it ?
>
> Since it probably in your code. Please code (or place to download)
> the driver code.
You can download from http://sourceforge.net/projects/accel-pptp
/*
* Point-to-Point Tunneling Protocol for Linux
*
* Authors: Kozlov D. (xeb@...l.ru)
*
* 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/skbuff.h>
#include <linux/init.h>
#include <linux/ppp_channel.h>
#include <linux/ppp_defs.h>
#include <linux/if_ppp.h>
#include "if_pppox.h"
#include <linux/notifier.h>
#include <linux/file.h>
#include <linux/proc_fs.h>
#include <linux/in.h>
#include <linux/ip.h>
#include <linux/netfilter.h>
#include <linux/netfilter_ipv4.h>
#include <linux/version.h>
#include <linux/spinlock.h>
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
#include <linux/tqueue.h>
#include <linux/timer.h>
#else
#include <linux/workqueue.h>
#endif
#include <net/sock.h>
#include <net/protocol.h>
#include <net/ip.h>
#include <net/icmp.h>
#include <net/route.h>
#include <asm/uaccess.h>
#define PPTP_DRIVER_VERSION "0.7.8-r1"
MODULE_DESCRIPTION("Point-to-Point Tunneling Protocol for Linux");
MODULE_AUTHOR("Kozlov D. (xeb@...l.ru)");
MODULE_LICENSE("GPL");
static int log_level=0;
static int log_packets=10;
static int rx_stop=0;
static int min_window=5;
static int max_window=100;
static int statistics=0;
static int stat_collect_time=3;
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
MODULE_PARM(min_window,"i");
MODULE_PARM(max_window,"i");
MODULE_PARM(log_level,"i");
MODULE_PARM(log_packets,"i");
MODULE_PARM(statistics,"i");
MODULE_PARM(stat_collect_time,"i");
#else
module_param(min_window,int,0);
module_param(max_window,int,0);
module_param(log_level,int,0);
module_param(log_packets,int,0);
module_param(statistics,int,0);
module_param(stat_collect_time,int,0);
#endif
MODULE_PARM_DESC(min_window,"Minimum sliding window size (default=3)");
MODULE_PARM_DESC(max_window,"Maximum sliding window size (default=100)");
MODULE_PARM_DESC(log_level,"Logging level (default=0)");
MODULE_PARM_DESC(statistics,"Performance statistics collection");
MODULE_PARM_DESC(stat_collect_time,"Statistics collect time (sec)");
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
#define __wait_event_timeout(wq, condition, ret) \
do { \
wait_queue_t __wait; \
init_waitqueue_entry(&__wait, current); \
\
for (;;) { \
set_current_state(TASK_UNINTERRUPTIBLE); \
if (condition) \
break; \
ret = schedule_timeout(ret); \
if (!ret) \
break; \
} \
current->state = TASK_RUNNING; \
remove_wait_queue(&wq, &__wait); \
} while (0)
#define wait_event_timeout(wq, condition, timeout) \
({ \
long __ret = timeout; \
if (!(condition)) \
__wait_event_timeout(wq, condition, __ret); \
__ret; \
})
#define INIT_TIMER(_timer,_routine,_data) \
do { \
(_timer)->function=_routine; \
(_timer)->data=_data; \
init_timer(_timer); \
} while (0);
static inline void *kzalloc(size_t size,int gfp)
{
void *p=kmalloc(size,gfp);
memset(p,0,size);
return p;
}
static inline void skb_get_timestamp(const struct sk_buff *skb, struct timeval
*stamp)
{
*stamp = skb->stamp;
}
static inline void __net_timestamp(struct sk_buff *skb, const struct timeval
*stamp)
{
struct timeval tv;
do_gettimeofday(&tv);
skb->stamp = *stamp;
}
#endif
//============= performance statistics =============
//static struct timeval stat_last_update={0,0};
unsigned long stat_last_update=0;
static unsigned int tx_packets_avg=0;
static unsigned int rx_packets_avg=0;
static unsigned int ack_timeouts_avg=0;
static unsigned int ack_works_avg=0;
static unsigned int buf_works_avg=0;
static unsigned int tx_packets_cur=0;
static unsigned int rx_packets_cur=0;
static unsigned int ack_timeouts_cur=0;
static unsigned int ack_works_cur=0;
static unsigned int buf_works_cur=0;
static rwlock_t stat_lock=RW_LOCK_UNLOCKED;
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
struct tq_struct stat_work;
#elif LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,20)
struct delayed_work stat_work;
#else
struct work_struct stat_work;
#endif
static void inc_stat_counter(unsigned int *counter)
{
if (statistics)
{
write_lock_bh(&stat_lock);
(*counter)++;
write_unlock_bh(&stat_lock);
}
}
#define INC_TX_PACKETS inc_stat_counter(&tx_packets_cur)
#define INC_RX_PACKETS inc_stat_counter(&rx_packets_cur)
#define INC_ACK_TIMEOUTS inc_stat_counter(&ack_timeouts_cur)
#define INC_ACK_WORKS inc_stat_counter(&ack_works_cur)
#define INC_BUF_WORKS inc_stat_counter(&buf_works_cur)
static void do_stat_work(void*p)
{
unsigned long delta_jiff;
write_lock_bh(&stat_lock);
delta_jiff=jiffies-stat_last_update;
stat_last_update=jiffies;
if (delta_jiff<=0) goto exit;
tx_packets_avg=(tx_packets_avg+tx_packets_cur*HZ/delta_jiff)/2;
rx_packets_avg=(rx_packets_avg+rx_packets_cur*HZ/delta_jiff)/2;
ack_timeouts_avg=(ack_timeouts_avg+ack_timeouts_cur*HZ/delta_jiff)/2;
ack_works_avg=(ack_works_avg+ack_works_cur*HZ/delta_jiff)/2;
buf_works_avg=(buf_works_avg+buf_works_cur*HZ/delta_jiff)/2;
tx_packets_cur=0;
rx_packets_cur=0;
ack_timeouts_cur=0;
ack_works_cur=0;
buf_works_cur=0;
exit:
write_unlock_bh(&stat_lock);
schedule_delayed_work(&stat_work,stat_collect_time*HZ);
}
//==================================================
static struct proc_dir_entry* proc_dir;
#define HASH_SIZE 32
#define HASH(addr) ((addr^(addr>>3))&0x1F)
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
static rwlock_t chan_lock=RW_LOCK_UNLOCKED;
#define SK_STATE(sk) (sk)->state
#else
static DEFINE_RWLOCK(chan_lock);
#define SK_STATE(sk) (sk)->sk_state
#endif
static struct pppox_sock *chans[HASH_SIZE];
static int pptp_xmit(struct ppp_channel *chan, struct sk_buff *skb);
static int read_proc(char *page, char **start, off_t off,int count,
int *eof, void *data);
static int __pptp_rcv(struct pppox_sock *po,struct sk_buff *skb,int new);
static struct ppp_channel_ops pptp_chan_ops= {
.start_xmit = pptp_xmit,
};
#define MISSING_WINDOW 20
#define WRAPPED( curseq, lastseq) \
((((curseq) & 0xffffff00) == 0) && \
(((lastseq) & 0xffffff00 ) == 0xffffff00))
/* gre header structure: -------------------------------------------- */
#define PPTP_GRE_PROTO 0x880B
#define PPTP_GRE_VER 0x1
#define PPTP_GRE_FLAG_C 0x80
#define PPTP_GRE_FLAG_R 0x40
#define PPTP_GRE_FLAG_K 0x20
#define PPTP_GRE_FLAG_S 0x10
#define PPTP_GRE_FLAG_A 0x80
#define PPTP_GRE_IS_C(f) ((f)&PPTP_GRE_FLAG_C)
#define PPTP_GRE_IS_R(f) ((f)&PPTP_GRE_FLAG_R)
#define PPTP_GRE_IS_K(f) ((f)&PPTP_GRE_FLAG_K)
#define PPTP_GRE_IS_S(f) ((f)&PPTP_GRE_FLAG_S)
#define PPTP_GRE_IS_A(f) ((f)&PPTP_GRE_FLAG_A)
struct pptp_gre_header {
u_int8_t flags; /* bitfield */
u_int8_t ver; /* should be PPTP_GRE_VER (enhanced GRE) */
u_int16_t protocol; /* should be PPTP_GRE_PROTO (ppp-encaps) */
u_int16_t payload_len; /* size of ppp payload, not inc. gre header */
u_int16_t call_id; /* peer's call_id for this session */
u_int32_t seq; /* sequence number. Present if S==1 */
u_int32_t ack; /* seq number of highest packet recieved by */
/* sender in this session */
};
#define PPTP_HEADER_OVERHEAD (2+sizeof(struct pptp_gre_header))
struct gre_statistics {
/* statistics for GRE receive */
unsigned int rx_accepted; // data packet accepted
unsigned int rx_lost; // data packet did not arrive before timeout
unsigned int rx_underwin; // data packet was under window (arrived too late
// or duplicate packet)
unsigned int rx_buffered; // data packet arrived earlier than expected,
// packet(s) before it were lost or reordered
unsigned int rx_errors; // OS error on receive
unsigned int rx_truncated; // truncated packet
unsigned int rx_invalid; // wrong protocol or invalid flags
unsigned int rx_acks; // acknowledgement only
/* statistics for GRE transmit */
unsigned int tx_sent; // data packet sent
unsigned int tx_failed; //
unsigned int tx_acks; // sent packet with just ACK
__u32 pt_seq;
struct timeval pt_time;
unsigned int rtt;
};
static struct pppox_sock * lookup_chan(__u16 call_id)
{
struct pppox_sock *po;
read_lock_bh(&chan_lock);
for(po=chans[HASH(call_id)]; po; po=po->next)
if (po->proto.pptp.src_addr.call_id==call_id)
break;
read_unlock_bh(&chan_lock);
return po;
}
static void add_chan(struct pppox_sock *po)
{
write_lock_bh(&chan_lock);
po->next=chans[HASH(po->proto.pptp.src_addr.call_id)];
chans[HASH(po->proto.pptp.src_addr.call_id)]=po;
write_unlock_bh(&chan_lock);
}
static void add_free_chan(struct pppox_sock *po)
{
static __u16 call_id=0;
struct pppox_sock *p;
write_lock_bh(&chan_lock);
while (1) {
if (++call_id==0) continue;
for(p=chans[HASH(call_id)]; p; p=p->next)
if (p->proto.pptp.src_addr.call_id==call_id)
break;
if (!p){
po->proto.pptp.src_addr.call_id=call_id;
po->next=chans[HASH(call_id)];
chans[HASH(call_id)]=po;
break;
}
}
write_unlock_bh(&chan_lock);
}
static void del_chan(struct pppox_sock *po)
{
struct pppox_sock *p1,*p2;
write_lock_bh(&chan_lock);
for(p2=NULL,p1=chans[HASH(po->proto.pptp.src_addr.call_id)]; p1 && p1!=po;
p2=p1,p1=p1->next);
if (p1){
if (p2) p2->next=p1->next;
else chans[HASH(po->proto.pptp.src_addr.call_id)]=p1->next;
}
write_unlock_bh(&chan_lock);
}
static int pptp_xmit(struct ppp_channel *chan, struct sk_buff *skb)
{
struct sock *sk = (struct sock *) chan->private;
struct pppox_sock *po = pppox_sk(sk);
struct pptp_opt *opt=&po->proto.pptp;
struct pptp_gre_header *hdr;
unsigned int header_len=sizeof(*hdr);
int len=skb?skb->len:0;
int err=0;
int window;
struct rtable *rt; /* Route to the other host */
struct net_device *tdev; /* Device to other host */
struct iphdr *iph; /* Our new IP header */
int max_headroom; /* The extra header space needed */
INC_TX_PACKETS;
spin_lock_bh(&opt->xmit_lock);
window=WRAPPED(opt->ack_recv,opt->seq_sent)?(__u32)
0xffffffff-opt->seq_sent+opt->ack_recv:opt->seq_sent-opt->ack_recv;
if (!skb){
if (opt->ack_sent == opt->seq_recv) goto exit;
}else if (window>opt->window){
__set_bit(PPTP_FLAG_PAUSE,(unsigned long*)&opt->flags);
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
mod_timer(&opt->ack_timeout_timer,opt->stat->rtt/100*HZ/10000);
#else
schedule_delayed_work(&opt->ack_timeout_work,opt->stat->rtt/100*HZ/10000);
#endif
goto exit;
}
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
{
struct rt_key key = {
.dst=opt->dst_addr.sin_addr.s_addr,
.src=opt->src_addr.sin_addr.s_addr,
.tos=RT_TOS(0),
};
if ((err=ip_route_output_key(&rt, &key))) {
goto tx_error;
}
}
#else
{
struct flowi fl = { .oif = 0,
.nl_u = { .ip4_u =
{ .daddr = opt->dst_addr.sin_addr.s_addr,
.saddr = opt->src_addr.sin_addr.s_addr,
.tos = RT_TOS(0) } },
.proto = IPPROTO_GRE };
if ((err=ip_route_output_key(&rt, &fl))) {
goto tx_error;
}
}
#endif
tdev = rt->u.dst.dev;
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
max_headroom = ((tdev->hard_header_len+15)&~15) +
sizeof(*iph)+sizeof(*hdr)+2;
#else
max_headroom = LL_RESERVED_SPACE(tdev) + sizeof(*iph)+sizeof(*hdr)+2;
#endif
if (!skb){
skb=dev_alloc_skb(max_headroom);
if (!skb) {
ip_rt_put(rt);
goto tx_error;
}
skb_reserve(skb,max_headroom-skb_headroom(skb));
}else if (skb_headroom(skb) < max_headroom ||
skb_cloned(skb) || skb_shared(skb)) {
struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom);
if (!new_skb) {
ip_rt_put(rt);
goto tx_error;
}
if (skb->sk)
skb_set_owner_w(new_skb, skb->sk);
kfree_skb(skb);
skb = new_skb;
}
if (skb->len){
int islcp;
unsigned char *data=skb->data;
islcp=((data[0] << 8) + data[1])== PPP_LCP && 1 <= data[2] && data[2] <= 7;
if (islcp) {
data=skb_push(skb,2);
data[0]=0xff;
data[1]=0x03;
}
}
len=skb->len;
if (len==0) header_len-=sizeof(hdr->seq);
if (opt->ack_sent == opt->seq_recv) header_len-=sizeof(hdr->ack);
// Push down and install GRE header
skb_push(skb,header_len);
hdr=(struct pptp_gre_header *)(skb->data);
hdr->flags = PPTP_GRE_FLAG_K;
hdr->ver = PPTP_GRE_VER;
hdr->protocol = htons(PPTP_GRE_PROTO);
hdr->call_id = htons(opt->dst_addr.call_id);
if (!len){
hdr->payload_len = 0;
hdr->ver |= PPTP_GRE_FLAG_A;
/* ack is in odd place because S == 0 */
hdr->seq = htonl(opt->seq_recv);
opt->ack_sent = opt->seq_recv;
opt->stat->tx_acks++;
}else {
//if (!opt->seq_sent){
//}
hdr->flags |= PPTP_GRE_FLAG_S;
hdr->seq = htonl(opt->seq_sent++);
if (log_level>=3 && opt->seq_sent<=log_packets)
printk("PPTP[%i]: send packet:
seq=%i",opt->src_addr.call_id,opt->seq_sent);
if (opt->ack_sent != opt->seq_recv) {
/* send ack with this message */
hdr->ver |= PPTP_GRE_FLAG_A;
hdr->ack = htonl(opt->seq_recv);
opt->ack_sent = opt->seq_recv;
if (log_level>=3 && opt->seq_sent<=log_packets)
printk(" ack=%i",opt->seq_recv);
}
hdr->payload_len = htons(len);
if (log_level>=3 && opt->seq_sent<=log_packets)
printk("\n");
}
/*
* Push down and install the IP header.
*/
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,22)
skb->transport_header = skb->network_header;
skb_push(skb, sizeof(*iph));
skb_reset_network_header(skb);
#else
skb->h.raw = skb->nh.raw;
skb->nh.raw = skb_push(skb, sizeof(*iph));
#endif
memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED |
IPSKB_REROUTED);
#endif
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,22)
iph = ip_hdr(skb);
#else
iph = skb->nh.iph;
#endif
iph->version = 4;
iph->ihl = sizeof(struct iphdr) >> 2;
iph->frag_off = 0;//df;
iph->protocol = IPPROTO_GRE;
iph->tos = 0;
iph->daddr = rt->rt_dst;
iph->saddr = rt->rt_src;
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
iph->ttl = sysctl_ip_default_ttl;
#else
iph->ttl = dst_metric(&rt->u.dst, RTAX_HOPLIMIT);
#endif
iph->tot_len = htons(skb->len);
dst_release(skb->dst);
skb->dst = &rt->u.dst;
nf_reset(skb);
skb->ip_summed = CHECKSUM_NONE;
ip_select_ident(iph, &rt->u.dst, NULL);
ip_send_check(iph);
err = NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, skb, NULL, rt->u.dst.dev,
dst_output);
wake_up(&opt->wait);
if (err == NET_XMIT_SUCCESS || err == NET_XMIT_CN) {
opt->stat->tx_sent++;
if (!opt->stat->pt_seq){
opt->stat->pt_seq = opt->seq_sent;
do_gettimeofday(&opt->stat->pt_time);
}
}else goto tx_error;
spin_unlock_bh(&opt->xmit_lock);
return 1;
tx_error:
opt->stat->tx_failed++;
if (!len) kfree_skb(skb);
spin_unlock_bh(&opt->xmit_lock);
return 1;
exit:
spin_unlock_bh(&opt->xmit_lock);
return 0;
}
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,20)
static void ack_work(struct work_struct *work)
{
struct pptp_opt *opt=container_of(work,struct pptp_opt,ack_work);
struct pppox_sock *po=container_of(opt,struct pppox_sock,proto.pptp);
#else
static void ack_work(struct pppox_sock *po)
{
struct pptp_opt *opt=&po->proto.pptp;
#endif
INC_ACK_WORKS;
pptp_xmit(&po->chan,0);
if (!test_and_set_bit(PPTP_FLAG_PROC,(unsigned long*)&opt->flags)){
if (ppp_unit_number(&po->chan)!=-1){
char unit[10];
sprintf(unit,"ppp%i",ppp_unit_number(&po->chan));
create_proc_read_entry(unit,0,proc_dir,read_proc,po);
}else clear_bit(PPTP_FLAG_PROC,(unsigned long*)&opt->flags);
}
}
static void do_ack_timeout_work(struct pppox_sock *po)
{
struct pptp_opt *opt=&po->proto.pptp;
int paused;
spin_lock_bh(&opt->xmit_lock);
paused=__test_and_clear_bit(PPTP_FLAG_PAUSE,(unsigned long*)&opt->flags);
if (paused){
if (opt->window>min_window) --opt->window;
opt->ack_recv=opt->seq_sent;
}
spin_unlock_bh(&opt->xmit_lock);
if (paused) ppp_output_wakeup(&po->chan);
}
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,20)
static void _ack_timeout_work(struct work_struct *work)
{
struct pptp_opt *opt=container_of(work,struct
pptp_opt,ack_timeout_work.work);
struct pppox_sock *po=container_of(opt,struct pppox_sock,proto.pptp);
INC_ACK_TIMEOUTS;
do_ack_timeout_work(po);
}
#else
static void do_ack_timeout_work(struct pppox_sock *po)
{
INC_ACK_TIMEOUTS;
do_ack_timeout_work(po);
}
#endif
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
static void ack_timeout_timer(struct pppox_sock *po)
{
struct pptp_opt *opt;
opt=&po->proto.pptp;
schedule_task(&opt->ack_timeout_work);
}
#endif
static int get_seq(struct sk_buff *skb)
{
struct iphdr *iph;
u8 *payload;
struct pptp_gre_header *header;
iph = (struct iphdr*)skb->data;
payload = skb->data + (iph->ihl << 2);
header = (struct pptp_gre_header *)(payload);
return ntohl(header->seq);
}
static void do_buf_work(struct pppox_sock *po)
{
struct timeval tv1,tv2;
struct sk_buff *skb;
struct pptp_opt *opt=&po->proto.pptp;
unsigned int t;
spin_lock_bh(&opt->rcv_lock);
do_gettimeofday(&tv1);
while((skb=skb_dequeue(&opt->skb_buf))){
if (!__pptp_rcv(po,skb,0)){
skb_get_timestamp(skb,&tv2);
t=(tv1.tv_sec-tv2.tv_sec)*1000000+(tv1.tv_usec-tv2.tv_usec);
if (t<opt->stat->rtt){
skb_queue_head(&opt->skb_buf,skb);
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
mod_timer(&opt->buf_timer,t/100*HZ/10000);
#else
schedule_delayed_work(&opt->buf_work,t/100*HZ/10000);
#endif
goto exit;
}
t=get_seq(skb)-1;
opt->stat->rx_lost+=t-opt->seq_recv;
opt->seq_recv=t;
if (log_level>=2)
printk("PPTP[%i]: unbuffer packet %i\n",opt->src_addr.call_id,t+1);
__pptp_rcv(po,skb,0);
}
}
exit:
spin_unlock_bh(&opt->rcv_lock);
}
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,20)
static void inline _buf_work(struct work_struct *work)
{
struct pptp_opt *opt=container_of(work,struct pptp_opt,buf_work.work);
struct pppox_sock *po=container_of(opt,struct pppox_sock,proto.pptp);
INC_BUF_WORKS;
do_buf_work(po);
}
#else
static void buf_work(struct pppox_sock *po)
{
INC_BUF_WORKS;
do_buf_work(po);
}
#endif
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
static void buf_timer(struct pppox_sock *po)
{
struct pptp_opt *opt;
opt=&po->proto.pptp;
schedule_task(&opt->buf_work);
}
#endif
static int __pptp_rcv(struct pppox_sock *po,struct sk_buff *skb,int new)
{
struct pptp_opt *opt=&po->proto.pptp;
int headersize,payload_len,seq;
__u8 *payload;
struct pptp_gre_header *header;
INC_RX_PACKETS;
header = (struct pptp_gre_header *)(skb->data);
if (log_level>=4) printk("PPTP[%i]:
__pptv_rcv %i\n",opt->src_addr.call_id,new);
if (new){
/* test if acknowledgement present */
if (PPTP_GRE_IS_A(header->ver)){
int paused;
__u32 ack = (PPTP_GRE_IS_S(header->flags))?
header->ack:header->seq; /* ack in different place if S = 0 */
ack = ntohl( ack);
spin_lock_bh(&opt->xmit_lock);
if (ack > opt->ack_recv) opt->ack_recv = ack;
/* also handle sequence number wrap-around */
if (WRAPPED(ack,opt->ack_recv)) opt->ack_recv = ack;
paused=__test_and_clear_bit(PPTP_FLAG_PAUSE,(unsigned long*)&opt->flags);
spin_unlock_bh(&opt->xmit_lock);
if (paused){
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
del_timer(&opt->ack_timeout_timer);
#else
cancel_delayed_work(&opt->ack_timeout_work);
#endif
ppp_output_wakeup(&po->chan);
}else if (opt->window<opt->max_window) ++opt->window;
if (opt->stat->pt_seq && opt->ack_recv > opt->stat->pt_seq){
struct timeval tv;
unsigned int rtt;
do_gettimeofday(&tv);
rtt = (tv.tv_sec - opt->stat->pt_time.tv_sec)*1000000+
tv.tv_usec-opt->stat->pt_time.tv_usec;
opt->stat->rtt = (opt->stat->rtt + rtt) / 2;
if (opt->stat->rtt>opt->timeout) opt->stat->rtt=opt->timeout;
opt->stat->pt_seq=0;
}
}else do_ack_timeout_work(po);
/* test if payload present */
if (!PPTP_GRE_IS_S(header->flags)){
opt->stat->rx_acks++;
goto drop;
}
}
headersize = sizeof(*header);
payload_len = ntohs(header->payload_len);
seq = ntohl(header->seq);
/* no ack present? */
if (!PPTP_GRE_IS_A(header->ver)) headersize -= sizeof(header->ack);
/* check for incomplete packet (length smaller than expected) */
if (skb->len- headersize < payload_len){
if (log_level>=1)
printk("PPTP: discarding truncated packet (expected %d, got %d bytes)\n",
payload_len, skb->len- headersize);
opt->stat->rx_truncated++;
goto drop;
}
payload=skb->data+headersize;
/* check for expected sequence number */
if ((seq == opt->seq_recv + 1) || (!opt->timeout &&
(seq > opt->seq_recv + 1 || WRAPPED(seq, opt->seq_recv)))){
if ( log_level >= 3 && opt->seq_sent<=log_packets)
printk("PPTP[%i]: accepting packet %d size=%i
(%02x %02x %02x %02x %02x %02x)\n",opt->src_addr.call_id, seq,payload_len,
*(payload +0),
*(payload +1),
*(payload +2),
*(payload +3),
*(payload +4),
*(payload +5));
opt->stat->rx_accepted++;
opt->stat->rx_lost+=seq-(opt->seq_recv + 1);
opt->seq_recv = seq;
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
schedule_task(&opt->ack_work);
#else
schedule_work(&opt->ack_work);
#endif
skb_pull(skb,headersize);
if (payload[0] == PPP_ALLSTATIONS && payload[1] == PPP_UI){
/* chop off address/control */
if (skb->len < 3)
goto drop;
skb_pull(skb,2);
}
if ((*skb->data) & 1){
/* protocol is compressed */
skb_push(skb, 1)[0] = 0;
}
skb->ip_summed=CHECKSUM_NONE;
ppp_input(&po->chan,skb);
return 1;
/* out of order, check if the number is too low and discard the packet.
* (handle sequence number wrap-around, and try to do it right) */
}else if ( seq < opt->seq_recv + 1 || WRAPPED(opt->seq_recv, seq) ){
if ( log_level >= 1)
printk("PPTP[%i]: discarding duplicate or old packet %d
(expecting %d)\n",opt->src_addr.call_id,
seq, opt->seq_recv + 1);
opt->stat->rx_underwin++;
/* sequence number too high, is it reasonably close? */
}else /*if ( seq < opt->seq_recv + MISSING_WINDOW ||
WRAPPED(seq, opt->seq_recv + MISSING_WINDOW) )*/{
opt->stat->rx_buffered++;
if ( log_level >= 2 && new )
printk("PPTP[%i]: buffering packet %d (expecting %d, lost or
reordered)\n",opt->src_addr.call_id,
seq, opt->seq_recv+1);
return 0;
/* no, packet must be discarded */
}/*else{
if ( log_level >= 1 )
printk("PPTP[%i]: discarding bogus packet %d
(expecting %d)\n",opt->src_addr.call_id,
seq, opt->seq_recv + 1);
}*/
drop:
kfree_skb(skb);
return -1;
}
static int pptp_rcv(struct sk_buff *skb)
{
struct pptp_gre_header *header;
struct pppox_sock *po;
struct pptp_opt *opt;
if (log_level>=4) printk("PPTP: pptp_rcv rx_stop=%i\n",rx_stop);
if (rx_stop) goto drop;
if (!pskb_may_pull(skb, 12))
goto drop;
header = (struct pptp_gre_header *)skb->data;
if ( /* version should be 1 */
((header->ver & 0x7F) != PPTP_GRE_VER) ||
/* PPTP-GRE protocol for PPTP */
(ntohs(header->protocol) != PPTP_GRE_PROTO)||
/* flag C should be clear */
PPTP_GRE_IS_C(header->flags) ||
/* flag R should be clear */
PPTP_GRE_IS_R(header->flags) ||
/* flag K should be set */
(!PPTP_GRE_IS_K(header->flags)) ||
/* routing and recursion ctrl = 0 */
((header->flags&0xF) != 0)){
/* if invalid, discard this packet */
if (log_level>=1)
printk("PPTP: Discarding GRE: %X %X %X %X %X %X\n",
header->ver&0x7F, ntohs(header->protocol),
PPTP_GRE_IS_C(header->flags),
PPTP_GRE_IS_R(header->flags),
PPTP_GRE_IS_K(header->flags),
header->flags & 0xF);
goto drop;
}
dst_release(skb->dst);
skb->dst = NULL;
nf_reset(skb);
if ((po=lookup_chan(htons(header->call_id)))) {
if (!(SK_STATE(sk_pppox(po))&PPPOX_BOUND))
goto drop;
if (!po->chan.ppp){
printk("PPTP: received packed, but ppp is down\n");
goto drop;
}
opt=&po->proto.pptp;
spin_lock_bh(&opt->rcv_lock);
if (__pptp_rcv(po,skb,1)){
spin_unlock_bh(&opt->rcv_lock);
do_buf_work(po);
}else{
__net_timestamp(skb);
skb_queue_tail(&opt->skb_buf, skb);
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
mod_timer(&opt->buf_timer,opt->stat->rtt/100*HZ/100000);
#else
schedule_delayed_work(&opt->buf_work,opt->stat->rtt/100*HZ/10000);
#endif
spin_unlock_bh(&opt->rcv_lock);
}
goto out;
}else {
if (log_level>=1)
printk("PPTP: Discarding packet from unknown
call_id %i\n",header->call_id);
icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PROT_UNREACH, 0);
}
drop:
kfree_skb(skb);
out:
return 0;
}
//=============== PROC =======================
static int proc_output (struct pppox_sock *po,char *buf)
{
struct pptp_opt *opt=&po->proto.pptp;
struct gre_statistics *stat=opt->stat;
char *p=buf;
p+=sprintf(p,"rx accepted = %d\n",stat->rx_accepted);
p+=sprintf(p,"rx lost = %d\n",stat->rx_lost);
p+=sprintf(p,"rx under win = %d\n",stat->rx_underwin);
p+=sprintf(p,"rx buffered = %d\n",stat->rx_buffered);
p+=sprintf(p,"rx invalid = %d\n",stat->rx_invalid);
p+=sprintf(p,"rx acks = %d\n",stat->rx_acks);
p+=sprintf(p,"tx sent = %d\n",stat->tx_sent);
p+=sprintf(p,"tx failed = %d\n",stat->tx_failed);
p+=sprintf(p,"tx acks = %d\n",stat->tx_acks);
p+=sprintf(p,"rtt = %d\n",stat->rtt);
p+=sprintf(p,"timeout = %d\n",opt->timeout);
p+=sprintf(p,"window = %d\n",opt->window);
p+=sprintf(p,"max window = %d\n",opt->max_window);
return p-buf;
}
static int read_proc(char *page, char **start, off_t off,int count, int *eof,
void *data)
{
struct pppox_sock *po = data;
int len = proc_output (po,page);
if (len <= off+count) *eof = 1;
*start = page + off;
len -= off;
if (len>count) len = count;
if (len<0) len = 0;
return len;
}
int ctrl_write_proc(struct file* file,const char __user *buffer,unsigned long
count,void *data)
{
int res=count;
char *tmp_buf=kmalloc(count+1,GFP_KERNEL);
if (copy_from_user(tmp_buf,buffer,count))
res=-EFAULT;
else{
int val;
tmp_buf[count]=0;
if (sscanf(tmp_buf," log_level = %i",&val)==1) log_level=val;
else if (sscanf(tmp_buf," log_packets = %i",&val)==1) log_packets=val;
else if (sscanf(tmp_buf," rx_stop = %i",&val)==1) rx_stop=val;
else res=-EINVAL;
}
kfree(tmp_buf);
return res;
}
int stat_write_proc(struct file* file,const char __user *buffer,unsigned long
count,void *data)
{
int res=count;
char *tmp_buf=kmalloc(count+1,GFP_KERNEL);
if (copy_from_user(tmp_buf,buffer,count))
res=-EFAULT;
else{
int val;
tmp_buf[count]=0;
if (sscanf(tmp_buf," enable = %i",&val)==1){
if (!statistics && val){
stat_last_update=jiffies;
schedule_delayed_work(&stat_work,stat_collect_time*HZ);
}
else if (statistics && !val){
cancel_delayed_work(&stat_work);
}
statistics=val;
}
else if (sscanf(tmp_buf," collect_time = %i",&val)==1){
if (val<=0) res=-EINVAL;
else stat_collect_time=val;
}
else res=-EINVAL;
}
kfree(tmp_buf);
return res;
}
static int stat_read_proc(char *page, char **start, off_t off,int count, int
*eof, void *data)
{
int len;
char *p=page;
p+=sprintf(p,"enabled = %i\n",statistics);
p+=sprintf(p,"collect_time = %i\n",stat_collect_time);
p+=sprintf(p,"\nperformance counters per sec:\n");
p+=sprintf(p,"tx_packets = %i\n",tx_packets_avg);
p+=sprintf(p,"rx_packets = %i\n",rx_packets_avg);
p+=sprintf(p,"ack_timeouts = %i\n",ack_timeouts_avg);
p+=sprintf(p,"ack_works = %i\n",ack_works_avg);
p+=sprintf(p,"buf_works = %i\n",buf_works_avg);
len=p-page;
if (len <= off+count) *eof = 1;
*start = page + off;
len -= off;
if (len>count) len = count;
if (len<0) len = 0;
return len;
}
//============================================
static int pptp_bind(struct socket *sock,struct sockaddr *uservaddr,int
sockaddr_len)
{
struct sock *sk = sock->sk;
struct sockaddr_pppox *sp = (struct sockaddr_pppox *) uservaddr;
struct pppox_sock *po = pppox_sk(sk);
struct pptp_opt *opt=&po->proto.pptp;
int error=0;
if (log_level>=1)
printk("PPTP: bind: addr=%X call_id=%i\n",sp->sa_addr.pptp.sin_addr.s_addr,
sp->sa_addr.pptp.call_id);
lock_sock(sk);
opt->src_addr=sp->sa_addr.pptp;
if (sp->sa_addr.pptp.call_id){
if (lookup_chan(sp->sa_addr.pptp.call_id)){
error=-EBUSY;
goto end;
}
add_chan(po);
}else{
add_free_chan(po);
if (!opt->src_addr.call_id)
error=-EBUSY;
if (log_level>=1)
printk("PPTP: using call_id %i\n",opt->src_addr.call_id);
}
end:
release_sock(sk);
return error;
}
static int pptp_connect(struct socket *sock, struct sockaddr *uservaddr,
int sockaddr_len, int flags)
{
struct sock *sk = sock->sk;
struct sockaddr_pppox *sp = (struct sockaddr_pppox *) uservaddr;
struct pppox_sock *po = pppox_sk(sk);
struct pptp_opt *opt=&po->proto.pptp;
struct rtable *rt; /* Route to the other host */
int error=0;
if (log_level>=1)
printk("PPTP[%i]: connect: addr=%X call_id=%i\n",opt->src_addr.call_id,
sp->sa_addr.pptp.sin_addr.s_addr,sp->sa_addr.pptp.call_id);
lock_sock(sk);
if (sp->sa_protocol != PX_PROTO_PPTP){
error = -EINVAL;
goto end;
}
/* Check for already bound sockets */
if (SK_STATE(sk) & PPPOX_CONNECTED){
error = -EBUSY;
goto end;
}
/* Check for already disconnected sockets, on attempts to disconnect */
if (SK_STATE(sk) & PPPOX_DEAD){
error = -EALREADY;
goto end;
}
if (!opt->src_addr.sin_addr.s_addr || !sp->sa_addr.pptp.sin_addr.s_addr){
error = -EINVAL;
goto end;
}
po->chan.private=sk;
po->chan.ops=&pptp_chan_ops;
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
{
struct rt_key key = {
.dst=opt->dst_addr.sin_addr.s_addr,
.src=opt->src_addr.sin_addr.s_addr,
.tos=RT_TOS(0),
};
if (ip_route_output_key(&rt, &key)) {
return -EHOSTUNREACH;
}
}
#else
{
struct flowi fl = {
.nl_u = { .ip4_u =
{ .daddr = opt->dst_addr.sin_addr.s_addr,
.saddr = opt->src_addr.sin_addr.s_addr,
.tos = RT_CONN_FLAGS(sk) } },
.proto = IPPROTO_GRE };
security_sk_classify_flow(sk, &fl);
if (ip_route_output_key(&rt, &fl))
return -EHOSTUNREACH;
sk_setup_caps(sk, &rt->u.dst);
}
#endif
po->chan.mtu=dst_mtu(&rt->u.dst);
if (!po->chan.mtu) po->chan.mtu=PPP_MTU;
po->chan.mtu-=PPTP_HEADER_OVERHEAD;
po->chan.hdrlen=2+sizeof(struct pptp_gre_header);
error = ppp_register_channel(&po->chan);
if (error){
printk(KERN_ERR "PPTP: failed to register PPP channel (%d)\n",error);
goto end;
}
opt->dst_addr=sp->sa_addr.pptp;
SK_STATE(sk) = PPPOX_CONNECTED;
end:
release_sock(sk);
return error;
}
static int pptp_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_PPTP;
sp.sa_addr.pptp=pppox_sk(sock->sk)->proto.pptp.src_addr;
memcpy(uaddr, &sp, len);
*usockaddr_len = len;
return 0;
}
static int pptp_setsockopt(struct socket *sock, int level, int optname,
char* optval, int optlen)
{
struct sock *sk = sock->sk;
struct pppox_sock *po = pppox_sk(sk);
struct pptp_opt *opt=&po->proto.pptp;
int val;
if (optlen!=sizeof(int))
return -EINVAL;
if (get_user(val,(int __user*)optval))
return -EFAULT;
switch(optname) {
case PPTP_SO_TIMEOUT:
opt->timeout=val;
break;
case PPTP_SO_WINDOW:
opt->max_window=val;
opt->window=val/2;
break;
default:
return -ENOPROTOOPT;
}
return 0;
}
static int pptp_getsockopt(struct socket *sock, int level, int optname,
char* optval, int *optlen)
{
struct sock *sk = sock->sk;
struct pppox_sock *po = pppox_sk(sk);
struct pptp_opt *opt=&po->proto.pptp;
int len,val;
if (get_user(len,(int __user*)optlen))
return -EFAULT;
if (len<sizeof(int))
return -EINVAL;
switch(optname) {
case PPTP_SO_TIMEOUT:
val=opt->timeout;
break;
case PPTP_SO_WINDOW:
val=opt->window;
break;
default:
return -ENOPROTOOPT;
}
if (put_user(sizeof(int),(int __user*)optlen))
return -EFAULT;
if (put_user(val,(int __user*)optval))
return -EFAULT;
return 0;
}
static int pptp_release(struct socket *sock)
{
struct sock *sk = sock->sk;
struct pppox_sock *po;
struct pptp_opt *opt;
int error = 0;
if (!sk)
return 0;
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
if (sk->dead)
#else
if (sock_flag(sk, SOCK_DEAD))
#endif
return -EBADF;
SK_STATE(sk) = PPPOX_DEAD;
po = pppox_sk(sk);
opt=&po->proto.pptp;
if (log_level>=1)
printk("PPTP[%i]: release\n",opt->src_addr.call_id);
wake_up(&opt->wait);
if (opt->src_addr.sin_addr.s_addr) {
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
del_timer(&opt->buf_timer);
del_timer(&opt->ack_timeout_timer);
flush_scheduled_tasks();
#else
cancel_delayed_work(&opt->buf_work);
cancel_delayed_work(&opt->ack_timeout_work);
flush_scheduled_work();
#endif
skb_queue_purge(&opt->skb_buf);
del_chan(po);
if (test_bit(PPTP_FLAG_PROC,(unsigned long*)&opt->flags)) {
char unit[10];
sprintf(unit,"ppp%i",ppp_unit_number(&po->chan));
remove_proc_entry(unit,proc_dir);
}
}
pppox_unbind_sock(sk);
kfree(opt->stat);
sock_orphan(sk);
sock->sk = NULL;
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
skb_queue_purge(&sk->receive_queue);
#else
skb_queue_purge(&sk->sk_receive_queue);
#endif
sock_put(sk);
return error;
}
#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,0)
static struct proto pptp_sk_proto = {
.name = "PPTP",
.owner = THIS_MODULE,
.obj_size = sizeof(struct pppox_sock),
};
#endif
static struct proto_ops pptp_ops = {
.family = AF_PPPOX,
#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,0)
.owner = THIS_MODULE,
#endif
.release = pptp_release,
.bind = pptp_bind,
.connect = pptp_connect,
.socketpair = sock_no_socketpair,
.accept = sock_no_accept,
.getname = pptp_getname,
.poll = sock_no_poll,
.listen = sock_no_listen,
.shutdown = sock_no_shutdown,
.setsockopt = pptp_setsockopt,
.getsockopt = pptp_getsockopt,
.sendmsg = sock_no_sendmsg,
.recvmsg = sock_no_recvmsg,
.mmap = sock_no_mmap,
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
.ioctl = pppox_ioctl,
#endif
};
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
static void pptp_sock_destruct(struct sock *sk)
{
if (sk->protinfo.destruct_hook)
kfree(sk->protinfo.destruct_hook);
MOD_DEC_USE_COUNT;
}
static int pptp_create(struct socket *sock)
{
int error = -ENOMEM;
struct sock *sk;
struct pppox_sock *po;
struct pptp_opt *opt;
MOD_INC_USE_COUNT;
sk = sk_alloc(PF_PPPOX, GFP_KERNEL, 1);
if (!sk)
goto out;
sock_init_data(sock, sk);
sock->state = SS_UNCONNECTED;
sock->ops = &pptp_ops;
//sk->sk_backlog_rcv = pppoe_rcv_core;
sk->state = PPPOX_NONE;
sk->type = SOCK_STREAM;
sk->family = PF_PPPOX;
sk->protocol = PX_PROTO_PPTP;
sk->protinfo.pppox=kzalloc(sizeof(struct pppox_sock),GFP_KERNEL);
sk->destruct=pptp_sock_destruct;
sk->protinfo.destruct_hook=sk->protinfo.pppox;
po = pppox_sk(sk);
po->sk=sk;
opt=&po->proto.pptp;
opt->window=max_window/2;
opt->max_window=max_window;
opt->timeout=0;
opt->flags=0;
opt->seq_sent=0; opt->seq_recv=-1;
opt->ack_recv=0; opt->ack_sent=-1;
skb_queue_head_init(&opt->skb_buf);
INIT_TQUEUE(&opt->ack_work,(void(*)(void*))ack_work,po);
INIT_TQUEUE(&opt->buf_work,(void(*)(void*))buf_work,po);
INIT_TQUEUE(&opt->ack_timeout_work,(void(*)(void*))ack_timeout_work,po);
INIT_TIMER(&opt->buf_timer,(void(*)(unsigned long))buf_timer,(long int)po);
INIT_TIMER(&opt->ack_timeout_timer,(void(*)(unsigned long))ack_timeout_timer,
(long int)po);
opt->stat=kzalloc(sizeof(*opt->stat),GFP_KERNEL);
init_waitqueue_head(&opt->wait);
spin_lock_init(&opt->xmit_lock);
spin_lock_init(&opt->rcv_lock);
error = 0;
out:
return error;
}
#else
static int pptp_create(struct socket *sock)
{
int error = -ENOMEM;
struct sock *sk;
struct pppox_sock *po;
struct pptp_opt *opt;
sk = sk_alloc(PF_PPPOX, GFP_KERNEL, &pptp_sk_proto, 1);
if (!sk)
goto out;
sock_init_data(sock, sk);
sock->state = SS_UNCONNECTED;
sock->ops = &pptp_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_PPTP;
po = pppox_sk(sk);
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
po->sk=sk;
#endif
opt=&po->proto.pptp;
opt->window=max_window/2;
opt->max_window=max_window;
opt->timeout=0;
opt->flags=0;
opt->seq_sent=0; opt->seq_recv=-1;
opt->ack_recv=0; opt->ack_sent=-1;
skb_queue_head_init(&opt->skb_buf);
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,20)
INIT_WORK(&opt->ack_work,(work_func_t)ack_work);
INIT_DELAYED_WORK(&opt->buf_work,(work_func_t)_buf_work);
INIT_DELAYED_WORK(&opt->ack_timeout_work,(work_func_t)_ack_timeout_work);
#else
INIT_WORK(&opt->ack_work,(void(*)(void*))ack_work,po);
INIT_WORK(&opt->buf_work,(void(*)(void*))buf_work,po);
INIT_WORK(&opt->ack_timeout_work,(void(*)(void*))ack_timeout_work,po);
#endif
opt->stat=kzalloc(sizeof(*opt->stat),GFP_KERNEL);
init_waitqueue_head(&opt->wait);
spin_lock_init(&opt->xmit_lock);
spin_lock_init(&opt->rcv_lock);
error = 0;
out:
return error;
}
#endif
static int pptp_ioctl(struct socket *sock, unsigned int cmd, unsigned long
arg)
{
struct sock *sk = sock->sk;
struct pppox_sock *po = pppox_sk(sk);
struct pptp_opt *opt=&po->proto.pptp;
int res=-EINVAL;
switch (cmd) {
case PPPTPIOWFP:
release_sock(sk);
res=wait_event_timeout(opt->wait,opt->seq_sent||SK_STATE(sk) ==
PPPOX_DEAD,arg*HZ);
res=(res&&res<HZ)?1:res/HZ;
lock_sock(sk);
break;
}
return res;
}
static struct pppox_proto pppox_pptp_proto = {
.create = pptp_create,
.ioctl = pptp_ioctl,
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,15)
.owner = THIS_MODULE,
#endif
};
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
static struct inet_protocol net_pptp_protocol = {
.handler = pptp_rcv,
//.err_handler = pptp_err,
.protocol = IPPROTO_GRE,
.name = "PPTP",
};
#else
static struct net_protocol net_pptp_protocol = {
.handler = pptp_rcv,
//.err_handler = pptp_err,
};
#endif
static int pptp_init_module(void)
{
struct proc_dir_entry *res;
int err=0;
printk(KERN_INFO "PPTP driver version " PPTP_DRIVER_VERSION "\n");
if (stat_collect_time==0)
{
printk(KERN_ERR "PPTP: stat_collect_time must be >0\n");
return -EINVAL;
}
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
inet_add_protocol(&net_pptp_protocol);
#else
if (inet_add_protocol(&net_pptp_protocol, IPPROTO_GRE) < 0) {
printk(KERN_INFO "PPTP: can't add protocol\n");
goto out;
}
#endif
#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,0)
err = proto_register(&pptp_sk_proto, 0);
if (err){
printk(KERN_INFO "PPTP: can't register sk_proto\n");
goto out_inet_del_protocol;
}
#endif
err = register_pppox_proto(PX_PROTO_PPTP, &pppox_pptp_proto);
if (err){
printk(KERN_INFO "PPTP: can't register pppox_proto\n");
goto out_unregister_sk_proto;
}
proc_dir=proc_mkdir("net/pptp",NULL);
if (proc_dir){
proc_dir->owner=THIS_MODULE;
res=create_proc_entry("ctrl",0,proc_dir);
if (!res)printk(KERN_ERR "PPTP: failed to create ctrl proc entry\n");
else res->write_proc=ctrl_write_proc;
res=create_proc_entry("stat",0,proc_dir);
if (!res)printk(KERN_ERR "PPTP: failed to create stat proc entry\n");
else{
res->write_proc=stat_write_proc;
res->read_proc=stat_read_proc;
}
}else printk(KERN_ERR "PPTP: failed to create proc dir\n");
//console_verbose();
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
// TODO: not implemented
#elif LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,20)
INIT_DELAYED_WORK(&stat_work,(work_func_t)do_stat_work);
#else
INIT_WORK(&stat_work,(void(*)(void*))do_stat_work,NULL);
#endif
stat_last_update=jiffies;
if (statistics)
schedule_delayed_work(&stat_work,stat_collect_time*HZ);
out:
return err;
out_unregister_sk_proto:
#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,0)
proto_unregister(&pptp_sk_proto);
#endif
out_inet_del_protocol:
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
inet_del_protocol(&net_pptp_protocol);
#else
inet_del_protocol(&net_pptp_protocol, IPPROTO_GRE);
#endif
goto out;
}
static void pptp_exit_module(void)
{
cancel_delayed_work(&stat_work);
flush_scheduled_work();
unregister_pppox_proto(PX_PROTO_PPTP);
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
inet_del_protocol(&net_pptp_protocol);
#else
proto_unregister(&pptp_sk_proto);
inet_del_protocol(&net_pptp_protocol, IPPROTO_GRE);
#endif
if (proc_dir)
{
remove_proc_entry("ctrl",proc_dir);
remove_proc_entry("stat",proc_dir);
remove_proc_entry("pptp",NULL);
}
}
module_init(pptp_init_module);
module_exit(pptp_exit_module);
-
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