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https://github.com/team-infusion-developers/android_kernel_samsung_msm8976.git
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1695890057
Add IPv4 and IPv6 capable nf_conntrack port of the Amanda conntrack/NAT helper. Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
78 lines
2.2 KiB
C
78 lines
2.2 KiB
C
/* Amanda extension for TCP NAT alteration.
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* (C) 2002 by Brian J. Murrell <netfilter@interlinx.bc.ca>
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* based on a copy of HW's ip_nat_irc.c as well as other modules
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/skbuff.h>
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#include <linux/udp.h>
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#include <net/netfilter/nf_nat_helper.h>
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#include <net/netfilter/nf_nat_rule.h>
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#include <net/netfilter/nf_conntrack_helper.h>
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#include <net/netfilter/nf_conntrack_expect.h>
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#include <linux/netfilter/nf_conntrack_amanda.h>
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MODULE_AUTHOR("Brian J. Murrell <netfilter@interlinx.bc.ca>");
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MODULE_DESCRIPTION("Amanda NAT helper");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("ip_nat_amanda");
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static unsigned int help(struct sk_buff **pskb,
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enum ip_conntrack_info ctinfo,
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unsigned int matchoff,
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unsigned int matchlen,
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struct nf_conntrack_expect *exp)
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{
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char buffer[sizeof("65535")];
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u_int16_t port;
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unsigned int ret;
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/* Connection comes from client. */
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exp->saved_proto.tcp.port = exp->tuple.dst.u.tcp.port;
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exp->dir = IP_CT_DIR_ORIGINAL;
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/* When you see the packet, we need to NAT it the same as the
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* this one (ie. same IP: it will be TCP and master is UDP). */
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exp->expectfn = nf_nat_follow_master;
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/* Try to get same port: if not, try to change it. */
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for (port = ntohs(exp->saved_proto.tcp.port); port != 0; port++) {
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exp->tuple.dst.u.tcp.port = htons(port);
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if (nf_conntrack_expect_related(exp) == 0)
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break;
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}
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if (port == 0)
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return NF_DROP;
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sprintf(buffer, "%u", port);
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ret = nf_nat_mangle_udp_packet(pskb, exp->master, ctinfo,
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matchoff, matchlen,
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buffer, strlen(buffer));
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if (ret != NF_ACCEPT)
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nf_conntrack_unexpect_related(exp);
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return ret;
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}
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static void __exit nf_nat_amanda_fini(void)
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{
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rcu_assign_pointer(nf_nat_amanda_hook, NULL);
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synchronize_rcu();
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}
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static int __init nf_nat_amanda_init(void)
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{
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BUG_ON(rcu_dereference(nf_nat_amanda_hook));
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rcu_assign_pointer(nf_nat_amanda_hook, help);
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return 0;
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}
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module_init(nf_nat_amanda_init);
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module_exit(nf_nat_amanda_fini);
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