cregit-Linux how code gets into the kernel

Release 4.15 net/netfilter/nf_nat_amanda.c

Directory: net/netfilter
/* Amanda extension for TCP NAT alteration.
 * (C) 2002 by Brian J. Murrell <netfilter@interlinx.bc.ca>
 * based on a copy of HW's ip_nat_irc.c as well as other modules
 * (C) 2006-2012 Patrick McHardy <kaber@trash.net>
 *
 * 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/kernel.h>
#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/udp.h>

#include <net/netfilter/nf_conntrack_helper.h>
#include <net/netfilter/nf_conntrack_expect.h>
#include <net/netfilter/nf_nat_helper.h>
#include <linux/netfilter/nf_conntrack_amanda.h>

MODULE_AUTHOR("Brian J. Murrell <netfilter@interlinx.bc.ca>");
MODULE_DESCRIPTION("Amanda NAT helper");
MODULE_LICENSE("GPL");
MODULE_ALIAS("ip_nat_amanda");


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("65535")]; u_int16_t port; /* Connection comes from client. */ exp->saved_proto.tcp.port = exp->tuple.dst.u.tcp.port; exp->dir = IP_CT_DIR_ORIGINAL; /* When you see the packet, we need to NAT it the same as the * this one (ie. same IP: it will be TCP and master is UDP). */ 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 res; exp->tuple.dst.u.tcp.port = htons(port); res = nf_ct_expect_related(exp); if (res == 0) break; else if (res != -EBUSY) { port = 0; break; } } if (port == 0) { nf_ct_helper_log(skb, exp->master, "all ports in use"); return NF_DROP; } sprintf(buffer, "%u", port); if (!nf_nat_mangle_udp_packet(skb, exp->master, ctinfo, protoff, matchoff, matchlen, buffer, strlen(buffer))) { nf_ct_helper_log(skb, exp->master, "cannot mangle packet"); nf_ct_unexpect_related(exp); return NF_DROP; } return NF_ACCEPT; }

Contributors

PersonTokensPropCommitsCommitProp
Patrick McHardy17674.89%337.50%
Pablo Neira Ayuso4619.57%225.00%
Gao Feng72.98%112.50%
Eric Dumazet41.70%112.50%
Herbert Xu20.85%112.50%
Total235100.00%8100.00%


static void __exit nf_nat_amanda_fini(void) { RCU_INIT_POINTER(nf_nat_amanda_hook, NULL); synchronize_rcu(); }

Contributors

PersonTokensPropCommitsCommitProp
Patrick McHardy1894.74%150.00%
Stephen Hemminger15.26%150.00%
Total19100.00%2100.00%


static int __init nf_nat_amanda_init(void) { BUG_ON(nf_nat_amanda_hook != NULL); RCU_INIT_POINTER(nf_nat_amanda_hook, help); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Patrick McHardy2596.15%266.67%
Stephen Hemminger13.85%133.33%
Total26100.00%3100.00%

module_init(nf_nat_amanda_init); module_exit(nf_nat_amanda_fini);

Overall Contributors

PersonTokensPropCommitsCommitProp
Patrick McHardy27180.90%541.67%
Pablo Neira Ayuso4914.63%325.00%
Gao Feng72.09%18.33%
Eric Dumazet41.19%18.33%
Herbert Xu20.60%18.33%
Stephen Hemminger20.60%18.33%
Total335100.00%12100.00%
Directory: net/netfilter
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