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Linux/net/ipv6/netfilter/nft_masq_ipv6.c

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  1 /*
  2  * Copyright (c) 2014 Arturo Borrero Gonzalez <arturo@debian.org>
  3  *
  4  * This program is free software; you can redistribute it and/or modify
  5  * it under the terms of the GNU General Public License version 2 as
  6  * published by the Free Software Foundation.
  7  */
  8 
  9 #include <linux/kernel.h>
 10 #include <linux/init.h>
 11 #include <linux/module.h>
 12 #include <linux/netlink.h>
 13 #include <linux/netfilter.h>
 14 #include <linux/netfilter/nf_tables.h>
 15 #include <net/netfilter/nf_tables.h>
 16 #include <net/netfilter/nf_nat.h>
 17 #include <net/netfilter/nft_masq.h>
 18 #include <net/netfilter/ipv6/nf_nat_masquerade.h>
 19 
 20 static void nft_masq_ipv6_eval(const struct nft_expr *expr,
 21                                struct nft_regs *regs,
 22                                const struct nft_pktinfo *pkt)
 23 {
 24         struct nft_masq *priv = nft_expr_priv(expr);
 25         struct nf_nat_range range;
 26 
 27         memset(&range, 0, sizeof(range));
 28         range.flags = priv->flags;
 29         if (priv->sreg_proto_min) {
 30                 range.min_proto.all =
 31                         *(__be16 *)&regs->data[priv->sreg_proto_min];
 32                 range.max_proto.all =
 33                         *(__be16 *)&regs->data[priv->sreg_proto_max];
 34         }
 35         regs->verdict.code = nf_nat_masquerade_ipv6(pkt->skb, &range,
 36                                                     nft_out(pkt));
 37 }
 38 
 39 static void
 40 nft_masq_ipv6_destroy(const struct nft_ctx *ctx, const struct nft_expr *expr)
 41 {
 42         nf_ct_netns_put(ctx->net, NFPROTO_IPV6);
 43 }
 44 
 45 static struct nft_expr_type nft_masq_ipv6_type;
 46 static const struct nft_expr_ops nft_masq_ipv6_ops = {
 47         .type           = &nft_masq_ipv6_type,
 48         .size           = NFT_EXPR_SIZE(sizeof(struct nft_masq)),
 49         .eval           = nft_masq_ipv6_eval,
 50         .init           = nft_masq_init,
 51         .destroy        = nft_masq_ipv6_destroy,
 52         .dump           = nft_masq_dump,
 53         .validate       = nft_masq_validate,
 54 };
 55 
 56 static struct nft_expr_type nft_masq_ipv6_type __read_mostly = {
 57         .family         = NFPROTO_IPV6,
 58         .name           = "masq",
 59         .ops            = &nft_masq_ipv6_ops,
 60         .policy         = nft_masq_policy,
 61         .maxattr        = NFTA_MASQ_MAX,
 62         .owner          = THIS_MODULE,
 63 };
 64 
 65 static int __init nft_masq_ipv6_module_init(void)
 66 {
 67         int ret;
 68 
 69         ret = nft_register_expr(&nft_masq_ipv6_type);
 70         if (ret < 0)
 71                 return ret;
 72 
 73         nf_nat_masquerade_ipv6_register_notifier();
 74 
 75         return ret;
 76 }
 77 
 78 static void __exit nft_masq_ipv6_module_exit(void)
 79 {
 80         nft_unregister_expr(&nft_masq_ipv6_type);
 81         nf_nat_masquerade_ipv6_unregister_notifier();
 82 }
 83 
 84 module_init(nft_masq_ipv6_module_init);
 85 module_exit(nft_masq_ipv6_module_exit);
 86 
 87 MODULE_LICENSE("GPL");
 88 MODULE_AUTHOR("Arturo Borrero Gonzalez <arturo@debian.org>");
 89 MODULE_ALIAS_NFT_AF_EXPR(AF_INET6, "masq");
 90 

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