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natcap_main.c
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natcap_main.c
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/*
* Author: Chen Minqiang <[email protected]>
* Date : Wed, 19 Dec 2012 09:52:21 +0800
*
* This file is part of the natcap.
*
* natcap 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 3 of the License, or
* (at your option) any later version.
*
* natcap is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with natcap; see the file COPYING. If not, see
* <http://www.gnu.org/licenses/>.
*/
#include <linux/ctype.h>
#include <linux/cdev.h>
#include <linux/device.h>
#include <linux/fs.h>
#include <linux/seq_file.h>
#include <linux/if_ether.h>
#include <linux/if_packet.h>
#include <linux/init.h>
#include <linux/ip.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/vmalloc.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/netfilter.h>
#include <linux/skbuff.h>
#include <linux/socket.h>
#include <linux/string.h>
#include <linux/syscalls.h>
#include <linux/tcp.h>
#include <linux/uaccess.h>
#include <linux/unistd.h>
#include <linux/version.h>
#include <linux/mman.h>
#include <linux/spinlock.h>
#include <linux/rcupdate.h>
#include <linux/highmem.h>
#include <net/ip.h>
#include <net/tcp.h>
#include <net/udp.h>
#include "natcap.h"
#include "natcap_common.h"
#include "natcap_client.h"
#include "natcap_server.h"
#include "natcap_knock.h"
#include "natcap_peer.h"
static int natcap_major = 0;
static int natcap_minor = 0;
static int number_of_devices = 1;
static struct cdev natcap_cdev;
const char *natcap_dev_name = "natcap_ctl";
static struct class *natcap_class;
static struct device *natcap_dev;
static void *natcap_start(struct seq_file *m, loff_t *pos)
{
int n = 0;
char *natcap_ctl_buffer = m->private;
if ((*pos) == 0) {
n = snprintf(natcap_ctl_buffer,
PAGE_SIZE - 1,
"# Version: %s\n"
"# Usage:\n"
"# disabled=Number -- set disable/enable\n"
"# debug=Number -- set debug value\n"
"# server [ip]:[port]-[e/o] -- add one server\n"
"# delete [ip]:[port]-[e/o] -- delete one server\n"
"# clean -- remove all existing server(s)\n"
"# change_server -- change current server\n"
"#\n"
"# Info:\n"
"# mode=%s(%u)\n"
"# current_server0=" TUPLE_FMT "\n"
"# current_server1=" TUPLE_FMT "\n"
"# default_mac_addr=%02x:%02x:%02x:%02x:%02x:%02x\n"
"# u_hash=0x%08x(%u)\n"
"# u_mask=0x%08x\n"
"# si_mask=0x%08x\n"
"# ni_mask=0x%08x\n"
"# ni_forward=%u\n"
"# udp_seq_lock=%u\n"
"# server_flow_stop=%u\n"
"# protocol=%u\n"
"# server_seed=%u\n"
"# auth_enabled=%u\n"
"# tx_speed_limit=%d B/s\n"
"# rx_speed_limit=%d B/s\n"
"# tx_pkts_threshold=%d\n"
"# rx_pkts_threshold=%d\n"
"# http_confusion=%u\n"
"# encode_http_only=%u\n"
"# sproxy=%u\n"
"# knock_port=%u-%c-%c-%c\n"
"# knock_flood=%u\n"
"# natcap_redirect_port=%u\n"
"# natcap_client_redirect_port=%u\n"
"# natcap_max_pmtu=%u\n"
"# natcap_touch_timeout=%u\n"
"# flow_total_tx_bytes=%llu\n"
"# flow_total_rx_bytes=%llu\n"
"# auth_http_redirect_url=%s\n"
"# htp_confusion_host=%s\n"
"# server_persist_lock=%u\n"
"# dns_proxy_drop=%u\n"
"# peer_multipath=%u\n"
"# macfilter=%s(%u)\n"
"# ipfilter=%s(%u)\n"
"# dns_proxy_server=" TUPLE_FMT "\n"
"# server1_use_peer=%u\n"
"# natmap=%u-%u\n"
"# peer_sni_cache_used_nodes=%d\n"
"#\n"
"# Reload cmd:\n"
"\n"
"clean\n"
"disabled=%u\n"
"debug=%u\n"
"server_persist_timeout=%u\n"
"cnipwhitelist_mode=%u\n"
"dns_server=%pI4:%u\n"
"\n",
NATCAP_VERSION,
mode_str[mode], mode,
TUPLE_ARG(natcap_server_info_current(SERVER_GROUP_0)),
TUPLE_ARG(natcap_server_info_current(SERVER_GROUP_1)),
default_mac_addr[0], default_mac_addr[1], default_mac_addr[2], default_mac_addr[3], default_mac_addr[4], default_mac_addr[5],
ntohl(default_u_hash),
ntohl(default_u_hash),
user_mark_natcap_mask,
server_index_natcap_mask,
natcap_ignore_mask,
natcap_ignore_forward,
natcap_udp_seq_lock,
server_flow_stop,
default_protocol,
server_seed, auth_enabled,
natcap_tx_speed_get(),
natcap_rx_speed_get(),
tx_pkts_threshold,
rx_pkts_threshold,
http_confusion, encode_http_only, sproxy, ntohs(knock_port), knock_encryption ? 'e' : 'o',
knock_tcp_encode == TCP_ENCODE ? 'T' : 'U', knock_udp_encode == UDP_ENCODE ? 'U' : 'T',
knock_flood,
ntohs(natcap_redirect_port), ntohs(natcap_client_redirect_port), natcap_max_pmtu, natcap_touch_timeout,
flow_total_tx_bytes, flow_total_rx_bytes,
auth_http_redirect_url,
htp_confusion_host,
server_persist_lock,
dns_proxy_drop,
peer_multipath,
macfilter_acl_str[macfilter], macfilter,
ipfilter_acl_str[ipfilter], ipfilter,
TUPLE_ARG(dns_proxy_server),
natcap_server_use_peer, natmap_start, natmap_end,
peer_sni_cache_used_nodes(),
disabled, debug, server_persist_timeout,
cnipwhitelist_mode, &dns_server, ntohs(dns_port));
natcap_ctl_buffer[n] = 0;
return natcap_ctl_buffer;
} else if ((*pos) > 0) {
struct tuple *dst = NULL;
int x = 0;
for (x = SERVER_GROUP_0; x < SERVER_GROUP_MAX; x++) {
dst = (struct tuple *)natcap_server_info_get(x, (*pos) - 1);
if (dst) break;
}
if (dst) {
n = snprintf(natcap_ctl_buffer,
PAGE_SIZE - 1,
"server %d " TUPLE_FMT "\n",
x, TUPLE_ARG(dst));
natcap_ctl_buffer[n] = 0;
return natcap_ctl_buffer;
}
}
return NULL;
}
static void *natcap_next(struct seq_file *m, void *v, loff_t *pos)
{
(*pos)++;
if ((*pos) > 0) {
return natcap_start(m, pos);
}
return NULL;
}
static void natcap_stop(struct seq_file *m, void *v)
{
}
static int natcap_show(struct seq_file *m, void *v)
{
seq_printf(m, "%s", (char *)v);
return 0;
}
const struct seq_operations natcap_seq_ops = {
.start = natcap_start,
.next = natcap_next,
.stop = natcap_stop,
.show = natcap_show,
};
static ssize_t natcap_read(struct file *file, char __user *buf, size_t buf_len, loff_t *offset)
{
return seq_read(file, buf, buf_len, offset);
}
static ssize_t natcap_write(struct file *file, const char __user *buf, size_t buf_len, loff_t *offset)
{
int err = 0;
int n, l, x;
struct tuple dst;
int cnt = MAX_IOCTL_LEN;
static char data[MAX_IOCTL_LEN];
static int data_left = 0;
cnt -= data_left;
if (buf_len < cnt)
cnt = buf_len;
if (copy_from_user(data + data_left, buf, cnt) != 0)
return -EACCES;
n = 0;
while(n < cnt && (data[n] == ' ' || data[n] == '\n' || data[n] == '\t')) n++;
if (n) {
*offset += n;
data_left = 0;
return n;
}
//make sure line ended with '\n' and line len <=256
l = 0;
while (l < cnt && data[l + data_left] != '\n') l++;
if (l >= cnt) {
data_left += l;
if (data_left >= MAX_IOCTL_LEN) {
NATCAP_println("err: too long a line");
data_left = 0;
return -EINVAL;
}
goto done;
} else {
data[l + data_left] = '\0';
data_left = 0;
l++;
}
if (strncmp(data, "clean", 5) == 0) {
if (mode == CLIENT_MODE || mode == MIXING_MODE) {
for (x = 0; x < SERVER_GROUP_MAX; x++) {
natcap_server_info_cleanup(x);
}
goto done;
}
} else if (strncmp(data, "dns_server=", 11) == 0) {
if (mode == CLIENT_MODE || mode == MIXING_MODE) {
unsigned int a, b, c, d, e;
n = sscanf(data, "dns_server=%u.%u.%u.%u:%u", &a, &b, &c, &d, &e);
if ( (n == 5 && e <= 0xffff) &&
(((a & 0xff) == a) &&
((b & 0xff) == b) &&
((c & 0xff) == c) &&
((d & 0xff) == d)) ) {
dns_server = htonl((a<<24)|(b<<16)|(c<<8)|(d<<0));
dns_port = htons(e);
goto done;
}
}
} else if (strncmp(data, "server ", 7) == 0) {
if (mode == CLIENT_MODE || mode == MIXING_MODE) {
unsigned int a, b, c, d, e;
char f, g, h;
n = sscanf(data, "server %u %u.%u.%u.%u:%u-%c-%c-%c", &x, &a, &b, &c, &d, &e, &f, &g, &h);
if ( (n == 9 && e <= 0xffff) &&
(x < SERVER_GROUP_MAX) &&
(f == 'e' || f == 'o') &&
(g == 'T' || g == 'U') &&
(h == 'U' || h == 'T') &&
(((a & 0xff) == a) &&
((b & 0xff) == b) &&
((c & 0xff) == c) &&
((d & 0xff) == d)) ) {
dst.ip = htonl((a<<24)|(b<<16)|(c<<8)|(d<<0));
dst.port = htons(e);
dst.encryption = !!(f == 'e');
dst.tcp_encode = g == 'T' ? TCP_ENCODE : UDP_ENCODE;
dst.udp_encode = h == 'U' ? UDP_ENCODE : TCP_ENCODE;
if ((err = natcap_server_info_add(x, &dst)) == 0) {
goto done;
}
NATCAP_println("natcap_server_add() failed ret=%d", err);
}
}
} else if (strncmp(data, "dns_proxy_server=", 17) == 0) {
unsigned int a, b, c, d, e;
char f, g, h;
n = sscanf(data, "dns_proxy_server=%u.%u.%u.%u:%u-%c-%c-%c", &a, &b, &c, &d, &e, &f, &g, &h);
if ( (n == 8 && e <= 0xffff) &&
(f == 'e' || f == 'o') &&
(g == 'T' || g == 'U') &&
(h == 'U' || h == 'T') &&
(((a & 0xff) == a) &&
((b & 0xff) == b) &&
((c & 0xff) == c) &&
((d & 0xff) == d)) ) {
dst.ip = htonl((a<<24)|(b<<16)|(c<<8)|(d<<0));
dst.port = htons(e);
dst.encryption = !!(f == 'e');
dst.tcp_encode = g == 'T' ? TCP_ENCODE : UDP_ENCODE;
dst.udp_encode = h == 'U' ? UDP_ENCODE : TCP_ENCODE;
tuple_copy(dns_proxy_server, &dst);
goto done;
}
} else if (strncmp(data, "change_server", 13) == 0) {
if (mode == CLIENT_MODE || mode == MIXING_MODE) {
natcap_server_info_change(SERVER_GROUP_0, 1);
goto done;
}
} else if (strncmp(data, "delete", 6) == 0) {
if (mode == CLIENT_MODE || mode == MIXING_MODE) {
unsigned int a, b, c, d, e;
char f, g, h;
n = sscanf(data, "delete %u %u.%u.%u.%u:%u-%c-%c-%c", &x, &a, &b, &c, &d, &e, &f, &g, &h);
if ( (n == 9 && e <= 0xffff) &&
(x < SERVER_GROUP_MAX) &&
(f == 'e' || f == 'o') &&
(g == 'T' || g == 'U') &&
(h == 'U' || h == 'T') &&
(((a & 0xff) == a) &&
((b & 0xff) == b) &&
((c & 0xff) == c) &&
((d & 0xff) == d)) ) {
dst.ip = htonl((a<<24)|(b<<16)|(c<<8)|(d<<0));
dst.port = htons(e);
dst.encryption = !!(f == 'e');
dst.tcp_encode = g == 'T' ? TCP_ENCODE : UDP_ENCODE;
dst.udp_encode = h == 'U' ? UDP_ENCODE : TCP_ENCODE;
if ((err = natcap_server_info_delete(x, &dst)) == 0) {
goto done;
}
NATCAP_println("natcap_server_delete() failed ret=%d", err);
}
}
} else if (strncmp(data, "server1_use_peer=", 17) == 0) {
unsigned int d;
n = sscanf(data, "server1_use_peer=%u", &d);
if (n == 1) {
natcap_server_use_peer = d;
goto done;
}
} else if (strncmp(data, "debug=", 6) == 0) {
int d;
n = sscanf(data, "debug=%u", &d);
if (n == 1) {
debug = d;
goto done;
}
} else if (strncmp(data, "disabled=", 9) == 0) {
int d;
n = sscanf(data, "disabled=%u", &d);
if (n == 1) {
disabled = d;
goto done;
}
} else if (strncmp(data, "si_mask=", 8) == 0) {
unsigned int d;
n = sscanf(data, "si_mask=%u", &d);
if (n == 1) {
server_index_natcap_mask = d;
goto done;
}
} else if (strncmp(data, "ni_mask=", 8) == 0) {
unsigned int d;
n = sscanf(data, "ni_mask=%u", &d);
if (n == 1) {
natcap_ignore_mask = d;
goto done;
}
} else if (strncmp(data, "u_mask=", 7) == 0) {
unsigned int d;
n = sscanf(data, "u_mask=%u", &d);
if (n == 1) {
user_mark_natcap_mask = d;
goto done;
}
} else if (strncmp(data, "ni_forward=", 11) == 0) {
unsigned int d;
n = sscanf(data, "ni_forward=%u", &d);
if (n == 1) {
natcap_ignore_forward = d;
goto done;
}
} else if (strncmp(data, "udp_seq_lock=", 13) == 0) {
unsigned int d;
n = sscanf(data, "udp_seq_lock=%u", &d);
if (n == 1) {
natcap_udp_seq_lock = d;
goto done;
}
} else if (strncmp(data, "u_hash=", 7) == 0) {
if (mode == CLIENT_MODE || mode == MIXING_MODE) {
unsigned int d;
n = sscanf(data, "u_hash=%u", &d);
if (n == 1) {
default_u_hash = htonl(d);
goto done;
}
}
} else if (strncmp(data, "server_flow_stop=", 17) == 0) {
if (mode == SERVER_MODE || mode == MIXING_MODE) {
unsigned int d;
n = sscanf(data, "server_flow_stop=%u", &d);
if (n == 1) {
server_flow_stop = d;
goto done;
}
}
} else if (strncmp(data, "protocol=", 9) == 0) {
if (mode == CLIENT_MODE || mode == MIXING_MODE) {
unsigned int d;
n = sscanf(data, "protocol=%u", &d);
if (n == 1) {
default_protocol = d;
goto done;
}
}
} else if (strncmp(data, "server_persist_timeout=", 23) == 0) {
if (mode == CLIENT_MODE || mode == MIXING_MODE) {
int d;
n = sscanf(data, "server_persist_timeout=%u", &d);
if (n == 1) {
server_persist_timeout = d;
goto done;
}
}
} else if (strncmp(data, "server_persist_lock=", 20) == 0) {
if (mode == CLIENT_MODE || mode == MIXING_MODE) {
int d;
n = sscanf(data, "server_persist_lock=%u", &d);
if (n == 1) {
server_persist_lock = !!d;
goto done;
}
}
} else if (strncmp(data, "dns_proxy_drop=", 15) == 0) {
if (mode == CLIENT_MODE || mode == MIXING_MODE) {
int d;
n = sscanf(data, "dns_proxy_drop=%u", &d);
if (n == 1) {
dns_proxy_drop = d;
goto done;
}
}
} else if (strncmp(data, "peer_multipath=", 15) == 0) {
int d;
n = sscanf(data, "peer_multipath=%u", &d);
if (n == 1) {
peer_multipath = d;
goto done;
}
err = -EINVAL;
} else if (strncmp(data, "tx_speed_limit=", 15) == 0) {
if (mode == CLIENT_MODE || mode == MIXING_MODE) {
int d;
n = sscanf(data, "tx_speed_limit=%d", &d);
if (n == 1) {
natcap_tx_speed_set(d);
goto done;
}
}
} else if (strncmp(data, "rx_speed_limit=", 15) == 0) {
if (mode == CLIENT_MODE || mode == MIXING_MODE) {
int d;
n = sscanf(data, "rx_speed_limit=%d", &d);
if (n == 1) {
natcap_rx_speed_set(d);
goto done;
}
}
} else if (strncmp(data, "tx_pkts_threshold=", 18) == 0) {
if (mode == CLIENT_MODE || mode == MIXING_MODE) {
int d;
n = sscanf(data, "tx_pkts_threshold=%u", &d);
if (n == 1) {
tx_pkts_threshold = d;
goto done;
}
}
} else if (strncmp(data, "rx_pkts_threshold=", 18) == 0) {
if (mode == CLIENT_MODE || mode == MIXING_MODE) {
int d;
n = sscanf(data, "rx_pkts_threshold=%u", &d);
if (n == 1) {
rx_pkts_threshold = d;
goto done;
}
}
} else if (strncmp(data, "http_confusion=", 15) == 0) {
if (mode == CLIENT_MODE || mode == MIXING_MODE) {
int d;
n = sscanf(data, "http_confusion=%u", &d);
if (n == 1) {
http_confusion = d;
goto done;
}
}
} else if (strncmp(data, "cnipwhitelist_mode=", 19) == 0) {
if (mode == CLIENT_MODE || mode == MIXING_MODE) {
int d;
n = sscanf(data, "cnipwhitelist_mode=%u", &d);
if (n == 1) {
cnipwhitelist_mode = d;
goto done;
}
}
} else if (strncmp(data, "encode_http_only=", 17) == 0) {
if (mode == CLIENT_MODE || mode == MIXING_MODE) {
int d;
n = sscanf(data, "encode_http_only=%u", &d);
if (n == 1) {
encode_http_only = d;
goto done;
}
}
} else if (strncmp(data, "sproxy=", 7) == 0) {
if (mode == CLIENT_MODE || mode == MIXING_MODE) {
int d;
n = sscanf(data, "sproxy=%u", &d);
if (n == 1) {
sproxy = d;
goto done;
}
}
} else if (strncmp(data, "macfilter=", 10) == 0) {
if (mode == CLIENT_MODE || mode == MIXING_MODE) {
int d;
n = sscanf(data, "macfilter=%u", &d);
if (n == 1) {
if (d == NATCAP_ACL_NONE || d == NATCAP_ACL_ALLOW || d == NATCAP_ACL_DENY) {
macfilter = d;
goto done;
}
}
}
} else if (strncmp(data, "ipfilter=", 9) == 0) {
if (mode == CLIENT_MODE || mode == MIXING_MODE) {
int d;
n = sscanf(data, "ipfilter=%u", &d);
if (n == 1) {
if (d == NATCAP_ACL_NONE || d == NATCAP_ACL_ALLOW || d == NATCAP_ACL_DENY) {
ipfilter = d;
goto done;
}
}
}
} else if (strncmp(data, "knock_port=", 11) == 0) {
if (mode == KNOCK_MODE || mode == CLIENT_MODE || mode == MIXING_MODE) {
unsigned int d;
char e;
n = sscanf(data, "knock_port=%u", &d);
if (n == 1 && d <= 65535) {
knock_port = htons((unsigned short)(d & 0xffff));
n = sscanf(data, "knock_port=%u-%c", &d, &e);
if (n == 2 && e == 'e') {
knock_encryption = 1;
} else {
knock_encryption = 0;
}
if (n == 2) {
char g, h;
n = sscanf(data, "knock_port=%u-%c-%c-%c", &d, &e, &g, &h);
if (n == 4 && (e == 'e' || e == 'o') && (g == 'T' || g == 'U') && (h == 'U' || h == 'T')) {
knock_tcp_encode = g == 'T' ? TCP_ENCODE : UDP_ENCODE;
knock_udp_encode = h == 'U' ? UDP_ENCODE : TCP_ENCODE;
}
}
goto done;
}
}
} else if (strncmp(data, "knock_flood=", 12) == 0) {
if (mode == KNOCK_MODE || mode == CLIENT_MODE || mode == MIXING_MODE) {
unsigned int d;
n = sscanf(data, "knock_flood=%u", &d);
if (n == 1) {
knock_flood = d;
goto done;
}
}
} else if (strncmp(data, "natcap_redirect_port=", 21) == 0) {
if (mode == SERVER_MODE || mode == MIXING_MODE) {
unsigned int d;
n = sscanf(data, "natcap_redirect_port=%u", &d);
if (n == 1 && d <= 65535) {
natcap_redirect_port = htons((unsigned short)(d & 0xffff));
goto done;
}
}
} else if (strncmp(data, "natcap_client_redirect_port=", 28) == 0) {
if (mode == CLIENT_MODE || mode == MIXING_MODE) {
unsigned int d;
n = sscanf(data, "natcap_client_redirect_port=%u", &d);
if (n == 1 && d <= 65535) {
natcap_client_redirect_port = htons((unsigned short)(d & 0xffff));
goto done;
}
}
} else if (strncmp(data, "natcap_touch_timeout=", 21) == 0) {
unsigned int d;
n = sscanf(data, "natcap_touch_timeout=%u", &d);
if (n == 1) {
natcap_touch_timeout = d;
goto done;
}
} else if (strncmp(data, "natcap_max_pmtu=", 16) == 0) {
unsigned int d;
n = sscanf(data, "natcap_max_pmtu=%u", &d);
if (n == 1 && d >= NATCAP_MIN_PMTU && d <= NATCAP_MAX_PMTU) {
natcap_max_pmtu = d;
goto done;
}
} else if (strncmp(data, "auth_http_redirect_url=", 23) == 0) {
if (mode == SERVER_MODE || mode == MIXING_MODE) {
char *tmp = NULL;
tmp = kmalloc(2048, GFP_KERNEL);
if (!tmp)
return -ENOMEM;
n = sscanf(data, "auth_http_redirect_url=%s\n", tmp);
if (n == 1 && memcmp("http", tmp, 4) == 0) {
void *old = auth_http_redirect_url;
auth_http_redirect_url = tmp;
if (old) {
synchronize_rcu();
kfree(old);
}
goto done;
}
kfree(tmp);
}
} else if (strncmp(data, "htp_confusion_host=", 19) == 0) {
if (mode == CLIENT_MODE || mode == MIXING_MODE) {
char *tmp = NULL;
tmp = kmalloc(1024, GFP_KERNEL);
if (!tmp)
return -ENOMEM;
n = sscanf(data, "htp_confusion_host=%s\n", tmp);
tmp[1023] = 0;
if (n == 1 && strlen(tmp) <= 63) {
strcpy(htp_confusion_host, tmp);
kfree(tmp);
sprintf(htp_confusion_req, htp_confusion_req_format, get_random_u32(), htp_confusion_host);
goto done;
}
kfree(tmp);
}
} else if (strncmp(data, "cn_domain_dump=", 15) == 0) {
if (mode == CLIENT_MODE || mode == MIXING_MODE) {
char *tmp = kmalloc(1024, GFP_KERNEL);
if (!tmp)
return -ENOMEM;
n = sscanf(data, "cn_domain_dump=%s\n", tmp);
tmp[1023] = 0;
if (n == 1) {
err = cn_domain_dump_path(tmp);
if (err == 0) {
kfree(tmp);
goto done;
}
}
kfree(tmp);
}
} else if (strncmp(data, "cn_domain_path=", 15) == 0) {
if (mode == CLIENT_MODE || mode == MIXING_MODE) {
char *tmp = kmalloc(1024, GFP_KERNEL);
if (!tmp)
return -ENOMEM;
n = sscanf(data, "cn_domain_path=%s\n", tmp);
tmp[1023] = 0;
if (n == 1) {
err = cn_domain_load_from_path(tmp);
if (err == 0) {
kfree(tmp);
goto done;
}
}
kfree(tmp);
}
} else if (strncmp(data, "cn_domain_raw=", 14) == 0) {
if (mode == CLIENT_MODE || mode == MIXING_MODE) {
char *tmp = kmalloc(1024, GFP_KERNEL);
if (!tmp)
return -ENOMEM;
n = sscanf(data, "cn_domain_raw=%s\n", tmp);
tmp[1023] = 0;
if (n == 1) {
err = cn_domain_load_from_raw(tmp);
if (err == 0) {
kfree(tmp);
goto done;
}
}
kfree(tmp);
}
} else if (strncmp(data, "cn_domain=", 10) == 0) {
if (mode == CLIENT_MODE || mode == MIXING_MODE) {
char tmp[128];
n = sscanf(data, "cn_domain=%s\n", tmp);
tmp[127] = 0;
if (n == 1) {
err = cn_domain_insert(tmp);
if (err == 0) {
goto done;
}
}
}
} else if (strncmp(data, "cn_domain_clean", 15) == 0) {
if (mode == CLIENT_MODE || mode == MIXING_MODE) {
cn_domain_clean();
goto done;
}
} else if (strncmp(data, "lk_domain=", 10) == 0) {
if (mode == CLIENT_MODE || mode == MIXING_MODE) {
char tmp[128];
n = sscanf(data, "lk_domain=%s\n", tmp);
tmp[127] = 0;
if (n == 1) {
n = cn_domain_lookup(tmp);
printk("cn_domain_lookup (%s) ret = %d\n", tmp, n);
goto done;
}
}
} else if (strncmp(data, "default_mac_addr=", 17) == 0) {
if (mode == CLIENT_MODE || mode == MIXING_MODE || mode == PEER_MODE) {
unsigned int a, b, c, d, e, f;
n = sscanf(data, "default_mac_addr=%02x:%02x:%02x:%02x:%02x:%02x\n", &a, &b, &c, &d, &e, &f);
if (n != 6) {
n = sscanf(data, "default_mac_addr=%02x-%02x-%02x-%02x-%02x-%02x\n", &a, &b, &c, &d, &e, &f);
}
if ( n == 6 &&
((a & 0xff) == a) &&
((b & 0xff) == b) &&
((c & 0xff) == c) &&
((d & 0xff) == d) &&
((e & 0xff) == e) &&
((f & 0xff) == f) ) {
default_mac_addr[0] = a;
default_mac_addr[1] = b;
default_mac_addr[2] = c;
default_mac_addr[3] = d;
default_mac_addr[4] = e;
default_mac_addr[5] = f;
goto done;
}
}
} else if (strncmp(data, "dns_server_node_add=", 20) == 0) {
if (mode == SERVER_MODE || mode == MIXING_MODE) {
unsigned int a, b, c, d;
n = sscanf(data, "dns_server_node_add=%u.%u.%u.%u", &a, &b, &c, &d);
if ( (n == 4) &&
(((a & 0xff) == a) &&
((b & 0xff) == b) &&
((c & 0xff) == c) &&
((d & 0xff) == d)) ) {
err = dns_server_node_add( htonl((a<<24)|(b<<16)|(c<<8)|(d<<0)) );
if (err == 0) {
goto done;
}
}
}
} else if (strncmp(data, "dns_server_node_clean", 21) == 0) {
dns_server_node_clean();
goto done;
} else if (strncmp(data, "cone_nat_clean", 14) == 0) {
cone_nat_cleanup();
goto done;
} else if (strncmp(data, "cone_nat_drop=", 14) == 0) {
unsigned int a[10];
n = sscanf(data, "cone_nat_drop=%u.%u.%u.%u:%u-%u.%u.%u.%u:%u",
&a[0], &a[1], &a[2], &a[3], &a[4], &a[5], &a[6], &a[7], &a[8], &a[9]);
if ( (n == 10) &&
(((a[0] & 0xff) == a[0]) &&
((a[1] & 0xff) == a[1]) &&
((a[2] & 0xff) == a[2]) &&
((a[3] & 0xff) == a[3]) &&
((a[4] & 0xffff) == a[4]) &&
((a[5] & 0xff) == a[5]) &&
((a[6] & 0xff) == a[6]) &&
((a[7] & 0xff) == a[7]) &&
((a[8] & 0xff) == a[8]) &&
((a[9] & 0xffff) == a[9])) ) {
__be32 iip = htonl((a[0]<<24)|(a[1]<<16)|(a[2]<<8)|(a[3]<<0));
__be16 iport = htons(a[4]);
__be32 eip = htonl((a[5]<<24)|(a[6]<<16)|(a[7]<<8)|(a[8]<<0));
__be16 eport = htons(a[9]);
cone_nat_drop(iip, iport, eip, eport);
goto done;
}
} else if (strncmp(data, "natmap_add=", 11) == 0) {
unsigned int a, b, c, d;
unsigned int port;
unsigned int port1;
n = sscanf(data, "natmap_add=%u-%u.%u.%u.%u", &port, &a, &b, &c, &d);
if ( (n == 5) && ((port & 0xffff) == port) &&
(((a & 0xff) == a) &&
((b & 0xff) == b) &&
((c & 0xff) == c) &&
((d & 0xff) == d)) ) {
if (!natmap_dip) {
natmap_dip = vmalloc(sizeof(__be32) * 65536);
if (!natmap_dip) {
return -ENOMEM;
}
memset(natmap_dip, 0, sizeof(__be32) * 65536);
}
natmap_dip[port] = htonl((a<<24)|(b<<16)|(c<<8)|(d<<0));
goto done;
}
n = sscanf(data, "natmap_add=%u-%u-%u.%u.%u.%u", &port, &port1, &a, &b, &c, &d);
if ( (n == 6) && ((port & 0xffff) == port) && ((port1 & 0xffff) == port1) && port <= port1 &&
(((a & 0xff) == a) &&
((b & 0xff) == b) &&
((c & 0xff) == c) &&
((d & 0xff) == d)) ) {
if (!natmap_dip) {
natmap_dip = vmalloc(sizeof(__be32) * 65536);
if (!natmap_dip) {
return -ENOMEM;
}
memset(natmap_dip, 0, sizeof(__be32) * 65536);
}
natmap_dip[port1] = htonl((a<<24)|(b<<16)|(c<<8)|(d<<0));
for (; port < port1; port = ((port + 1) & 0xffff))
natmap_dip[port] = htonl((a<<24)|(b<<16)|(c<<8)|(d<<0));
goto done;
}
} else if (strncmp(data, "natmap_clean", 12) == 0) {
natmap_start = 0;
natmap_end = 0;
synchronize_rcu();
if (natmap_dip) {
vfree(natmap_dip);
natmap_dip = NULL;
}
goto done;
} else if (strncmp(data, "natmap_start=", 13) == 0) {
unsigned int port;
n = sscanf(data, "natmap_start=%u", &port);
if ( (n == 1) && ((port & 0xffff) == port) ) {
natmap_start = port;
goto done;
}
} else if (strncmp(data, "natmap_end=", 11) == 0) {
unsigned int port;
n = sscanf(data, "natmap_end=%u", &port);
if ( (n == 1) && ((port & 0xffff) == port) ) {
natmap_end = port;
goto done;
}
}
NATCAP_println("ignoring line[%s]", data);
if (err != 0) {
return err;
}
done:
*offset += l;
return l;
}
static int natcap_open(struct inode *inode, struct file *file)
{
int ret;
//set nonseekable
file->f_mode &= ~(FMODE_LSEEK | FMODE_PREAD | FMODE_PWRITE);
ret = seq_open_private(file, &natcap_seq_ops, PAGE_SIZE);
if (ret)
return ret;
return 0;
}
static int natcap_release(struct inode *inode, struct file *file)
{
int ret = seq_release_private(inode, file);
return ret;
}
static struct file_operations natcap_fops = {
.owner = THIS_MODULE,
.open = natcap_open,
.release = natcap_release,
.read = natcap_read,
.write = natcap_write,
.llseek = seq_lseek,
};
static int natcap_mode_init(void)
{
int ret = -1;
switch (mode) {
case CLIENT_MODE:
ret = natcap_client_init();
if (ret != 0) {
break;
}
ret = natcap_peer_init();
if (ret != 0) {
natcap_client_exit();
break;
}
break;
case SERVER_MODE:
ret = natcap_server_init();
if (ret != 0) {
break;
}
ret = natcap_peer_init();
if (ret != 0) {
natcap_server_exit();
break;
}
break;
case MIXING_MODE:
ret = natcap_client_init();
if (ret != 0) {
break;
}
ret = natcap_server_init();
if (ret != 0) {
natcap_client_exit();
break;
}
ret = natcap_peer_init();
if (ret != 0) {
natcap_server_exit();
natcap_client_exit();
break;
}
break;
case KNOCK_MODE:
ret = natcap_knock_init();
break;
case PEER_MODE:
ret = natcap_peer_init();
default:
break;
}
return ret;
}
static void natcap_mode_exit(void)
{
switch (mode) {
case CLIENT_MODE:
natcap_peer_exit();
natcap_client_exit();
break;
case SERVER_MODE:
natcap_peer_exit();
natcap_server_exit();
break;
case MIXING_MODE:
natcap_peer_exit();
natcap_server_exit();
natcap_client_exit();
break;
case KNOCK_MODE:
natcap_knock_exit();
break;
case PEER_MODE:
natcap_peer_exit();
default:
break;
}
}
static int __init natcap_init(void) {
int retval = 0;
dev_t devno;
NATCAP_println("version: " NATCAP_VERSION "");