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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172// SPDX-License-Identifier: GPL-2.0-only/* * (C) 2000-2001 Svenning Soerensen <svenning@post5.tele.dk> * Copyright (c) 2011 Patrick McHardy <kaber@trash.net> */
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/ip.h>#include <linux/kernel.h>#include <linux/module.h>#include <linux/netdevice.h>#include <linux/ipv6.h>#include <linux/netfilter.h>#include <linux/netfilter_ipv4.h>#include <linux/netfilter_ipv6.h>#include <linux/netfilter/x_tables.h>#include <net/netfilter/nf_nat.h>
static unsigned intnetmap_tg6(struct sk_buff *skb, const struct xt_action_param *par){ const struct nf_nat_range2 *range = par->targinfo; struct nf_nat_range2 newrange; struct nf_conn *ct; enum ip_conntrack_info ctinfo; union nf_inet_addr new_addr, netmask; unsigned int i;
ct = nf_ct_get(skb, &ctinfo); for (i = 0; i < ARRAY_SIZE(range->min_addr.ip6); i++) netmask.ip6[i] = ~(range->min_addr.ip6[i] ^ range->max_addr.ip6[i]);
if (xt_hooknum(par) == NF_INET_PRE_ROUTING || xt_hooknum(par) == NF_INET_LOCAL_OUT) new_addr.in6 = ipv6_hdr(skb)->daddr; else new_addr.in6 = ipv6_hdr(skb)->saddr;
for (i = 0; i < ARRAY_SIZE(new_addr.ip6); i++) { new_addr.ip6[i] &= ~netmask.ip6[i]; new_addr.ip6[i] |= range->min_addr.ip6[i] & netmask.ip6[i]; }
newrange.flags = range->flags | NF_NAT_RANGE_MAP_IPS; newrange.min_addr = new_addr; newrange.max_addr = new_addr; newrange.min_proto = range->min_proto; newrange.max_proto = range->max_proto;
return nf_nat_setup_info(ct, &newrange, HOOK2MANIP(xt_hooknum(par)));}
static int netmap_tg6_checkentry(const struct xt_tgchk_param *par){ const struct nf_nat_range2 *range = par->targinfo;
if (!(range->flags & NF_NAT_RANGE_MAP_IPS)) return -EINVAL; return nf_ct_netns_get(par->net, par->family);}
static void netmap_tg_destroy(const struct xt_tgdtor_param *par){ nf_ct_netns_put(par->net, par->family);}
static unsigned intnetmap_tg4(struct sk_buff *skb, const struct xt_action_param *par){ struct nf_conn *ct; enum ip_conntrack_info ctinfo; __be32 new_ip, netmask; const struct nf_nat_ipv4_multi_range_compat *mr = par->targinfo; struct nf_nat_range2 newrange;
WARN_ON(xt_hooknum(par) != NF_INET_PRE_ROUTING && xt_hooknum(par) != NF_INET_POST_ROUTING && xt_hooknum(par) != NF_INET_LOCAL_OUT && xt_hooknum(par) != NF_INET_LOCAL_IN); ct = nf_ct_get(skb, &ctinfo);
netmask = ~(mr->range[0].min_ip ^ mr->range[0].max_ip);
if (xt_hooknum(par) == NF_INET_PRE_ROUTING || xt_hooknum(par) == NF_INET_LOCAL_OUT) new_ip = ip_hdr(skb)->daddr & ~netmask; else new_ip = ip_hdr(skb)->saddr & ~netmask; new_ip |= mr->range[0].min_ip & netmask;
memset(&newrange.min_addr, 0, sizeof(newrange.min_addr)); memset(&newrange.max_addr, 0, sizeof(newrange.max_addr)); newrange.flags = mr->range[0].flags | NF_NAT_RANGE_MAP_IPS; newrange.min_addr.ip = new_ip; newrange.max_addr.ip = new_ip; newrange.min_proto = mr->range[0].min; newrange.max_proto = mr->range[0].max;
/* Hand modified range to generic setup. */ return nf_nat_setup_info(ct, &newrange, HOOK2MANIP(xt_hooknum(par)));}
static int netmap_tg4_check(const struct xt_tgchk_param *par){ const struct nf_nat_ipv4_multi_range_compat *mr = par->targinfo;
if (!(mr->range[0].flags & NF_NAT_RANGE_MAP_IPS)) { pr_info_ratelimited("bad MAP_IPS.\n"); return -EINVAL; } if (mr->rangesize != 1) { pr_info_ratelimited("bad rangesize %u.\n", mr->rangesize); return -EINVAL; } return nf_ct_netns_get(par->net, par->family);}
static struct xt_target netmap_tg_reg[] __read_mostly = { { .name = "NETMAP", .family = NFPROTO_IPV6, .revision = 0, .target = netmap_tg6, .targetsize = sizeof(struct nf_nat_range), .table = "nat", .hooks = (1 << NF_INET_PRE_ROUTING) | (1 << NF_INET_POST_ROUTING) | (1 << NF_INET_LOCAL_OUT) | (1 << NF_INET_LOCAL_IN), .checkentry = netmap_tg6_checkentry, .destroy = netmap_tg_destroy, .me = THIS_MODULE, }, { .name = "NETMAP", .family = NFPROTO_IPV4, .revision = 0, .target = netmap_tg4, .targetsize = sizeof(struct nf_nat_ipv4_multi_range_compat), .table = "nat", .hooks = (1 << NF_INET_PRE_ROUTING) | (1 << NF_INET_POST_ROUTING) | (1 << NF_INET_LOCAL_OUT) | (1 << NF_INET_LOCAL_IN), .checkentry = netmap_tg4_check, .destroy = netmap_tg_destroy, .me = THIS_MODULE, },};
static int __init netmap_tg_init(void){ return xt_register_targets(netmap_tg_reg, ARRAY_SIZE(netmap_tg_reg));}
static void netmap_tg_exit(void){ xt_unregister_targets(netmap_tg_reg, ARRAY_SIZE(netmap_tg_reg));}
module_init(netmap_tg_init);module_exit(netmap_tg_exit);
MODULE_LICENSE("GPL");MODULE_DESCRIPTION("Xtables: 1:1 NAT mapping of subnets");MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");MODULE_ALIAS("ip6t_NETMAP");MODULE_ALIAS("ipt_NETMAP");