Release 4.14 net/netfilter/nf_nat_irc.c
/* IRC extension for TCP NAT alteration.
*
* (C) 2000-2001 by Harald Welte <laforge@gnumonks.org>
* (C) 2004 Rusty Russell <rusty@rustcorp.com.au> IBM Corporation
* based on a copy of RR's ip_nat_ftp.c
*
* 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/module.h>
#include <linux/moduleparam.h>
#include <linux/tcp.h>
#include <linux/kernel.h>
#include <net/netfilter/nf_nat.h>
#include <net/netfilter/nf_nat_helper.h>
#include <net/netfilter/nf_conntrack_helper.h>
#include <net/netfilter/nf_conntrack_expect.h>
#include <linux/netfilter/nf_conntrack_irc.h>
MODULE_AUTHOR("Harald Welte <laforge@gnumonks.org>");
MODULE_DESCRIPTION("IRC (DCC) NAT helper");
MODULE_LICENSE("GPL");
MODULE_ALIAS("ip_nat_irc");
static unsigned int help(struct sk_buff *skb,
enum ip_conntrack_info ctinfo,
unsigned int protoff,
unsigned int matchoff,
unsigned int matchlen,
struct nf_conntrack_expect *exp)
{
char buffer[sizeof("4294967296 65635")];
struct nf_conn *ct = exp->master;
union nf_inet_addr newaddr;
u_int16_t port;
/* Reply comes from server. */
newaddr = ct->tuplehash[IP_CT_DIR_REPLY].tuple.dst.u3;
exp->saved_proto.tcp.port = exp->tuple.dst.u.tcp.port;
exp->dir = IP_CT_DIR_REPLY;
exp->expectfn = nf_nat_follow_master;
/* Try to get same port: if not, try to change it. */
for (port = ntohs(exp->saved_proto.tcp.port); port != 0; port++) {
int ret;
exp->tuple.dst.u.tcp.port = htons(port);
ret = nf_ct_expect_related(exp);
if (ret == 0)
break;
else if (ret != -EBUSY) {
port = 0;
break;
}
}
if (port == 0) {
nf_ct_helper_log(skb, ct, "all ports in use");
return NF_DROP;
}
/* strlen("\1DCC CHAT chat AAAAAAAA P\1\n")=27
* strlen("\1DCC SCHAT chat AAAAAAAA P\1\n")=28
* strlen("\1DCC SEND F AAAAAAAA P S\1\n")=26
* strlen("\1DCC MOVE F AAAAAAAA P S\1\n")=26
* strlen("\1DCC TSEND F AAAAAAAA P S\1\n")=27
*
* AAAAAAAAA: bound addr (1.0.0.0==16777216, min 8 digits,
* 255.255.255.255==4294967296, 10 digits)
* P: bound port (min 1 d, max 5d (65635))
* F: filename (min 1 d )
* S: size (min 1 d )
* 0x01, \n: terminators
*/
/* AAA = "us", ie. where server normally talks to. */
snprintf(buffer, sizeof(buffer), "%u %u", ntohl(newaddr.ip), port);
pr_debug("nf_nat_irc: inserting '%s' == %pI4, port %u\n",
buffer, &newaddr.ip, port);
if (!nf_nat_mangle_tcp_packet(skb, ct, ctinfo, protoff, matchoff,
matchlen, buffer, strlen(buffer))) {
nf_ct_helper_log(skb, ct, "cannot mangle packet");
nf_ct_unexpect_related(exp);
return NF_DROP;
}
return NF_ACCEPT;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Patrick McHardy | 163 | 57.39% | 3 | 37.50% |
| Daniel Borkmann | 68 | 23.94% | 1 | 12.50% |
| Pablo Neira Ayuso | 44 | 15.49% | 2 | 25.00% |
| Gao Feng | 7 | 2.46% | 1 | 12.50% |
| Herbert Xu | 2 | 0.70% | 1 | 12.50% |
| Total | 284 | 100.00% | 8 | 100.00% |
static void __exit nf_nat_irc_fini(void)
{
RCU_INIT_POINTER(nf_nat_irc_hook, NULL);
synchronize_rcu();
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Patrick McHardy | 18 | 94.74% | 1 | 50.00% |
| Stephen Hemminger | 1 | 5.26% | 1 | 50.00% |
| Total | 19 | 100.00% | 2 | 100.00% |
static int __init nf_nat_irc_init(void)
{
BUG_ON(nf_nat_irc_hook != NULL);
RCU_INIT_POINTER(nf_nat_irc_hook, help);
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Patrick McHardy | 25 | 96.15% | 2 | 66.67% |
| Stephen Hemminger | 1 | 3.85% | 1 | 33.33% |
| Total | 26 | 100.00% | 3 | 100.00% |
/* Prior to 2.6.11, we had a ports param. No longer, but don't break users. */
static int warn_set(const char *val, struct kernel_param *kp)
{
printk(KERN_INFO KBUILD_MODNAME
": kernel >= 2.6.10 only uses 'ports' for conntrack modules\n");
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Patrick McHardy | 25 | 100.00% | 1 | 100.00% |
| Total | 25 | 100.00% | 1 | 100.00% |
module_param_call(ports, warn_set, NULL, NULL, 0);
module_init(nf_nat_irc_init);
module_exit(nf_nat_irc_fini);
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Patrick McHardy | 303 | 71.13% | 4 | 40.00% |
| Daniel Borkmann | 68 | 15.96% | 1 | 10.00% |
| Pablo Neira Ayuso | 44 | 10.33% | 2 | 20.00% |
| Gao Feng | 7 | 1.64% | 1 | 10.00% |
| Stephen Hemminger | 2 | 0.47% | 1 | 10.00% |
| Herbert Xu | 2 | 0.47% | 1 | 10.00% |
| Total | 426 | 100.00% | 10 | 100.00% |
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