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Linux/net/ipv4/netfilter/nft_redir_ipv4.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/nf_nat_redirect.h>
 18 #include <net/netfilter/nft_redir.h>
 19 
 20 static void nft_redir_ipv4_eval(const struct nft_expr *expr,
 21                                 struct nft_regs *regs,
 22                                 const struct nft_pktinfo *pkt)
 23 {
 24         struct nft_redir *priv = nft_expr_priv(expr);
 25         struct nf_nat_ipv4_multi_range_compat mr;
 26 
 27         memset(&mr, 0, sizeof(mr));
 28         if (priv->sreg_proto_min) {
 29                 mr.range[0].min.all =
 30                         *(__be16 *)&regs->data[priv->sreg_proto_min];
 31                 mr.range[0].max.all =
 32                         *(__be16 *)&regs->data[priv->sreg_proto_max];
 33                 mr.range[0].flags |= NF_NAT_RANGE_PROTO_SPECIFIED;
 34         }
 35 
 36         mr.range[0].flags |= priv->flags;
 37 
 38         regs->verdict.code = nf_nat_redirect_ipv4(pkt->skb, &mr, nft_hook(pkt));
 39 }
 40 
 41 static void
 42 nft_redir_ipv4_destroy(const struct nft_ctx *ctx, const struct nft_expr *expr)
 43 {
 44         nf_ct_netns_put(ctx->net, NFPROTO_IPV4);
 45 }
 46 
 47 static struct nft_expr_type nft_redir_ipv4_type;
 48 static const struct nft_expr_ops nft_redir_ipv4_ops = {
 49         .type           = &nft_redir_ipv4_type,
 50         .size           = NFT_EXPR_SIZE(sizeof(struct nft_redir)),
 51         .eval           = nft_redir_ipv4_eval,
 52         .init           = nft_redir_init,
 53         .destroy        = nft_redir_ipv4_destroy,
 54         .dump           = nft_redir_dump,
 55         .validate       = nft_redir_validate,
 56 };
 57 
 58 static struct nft_expr_type nft_redir_ipv4_type __read_mostly = {
 59         .family         = NFPROTO_IPV4,
 60         .name           = "redir",
 61         .ops            = &nft_redir_ipv4_ops,
 62         .policy         = nft_redir_policy,
 63         .maxattr        = NFTA_REDIR_MAX,
 64         .owner          = THIS_MODULE,
 65 };
 66 
 67 static int __init nft_redir_ipv4_module_init(void)
 68 {
 69         return nft_register_expr(&nft_redir_ipv4_type);
 70 }
 71 
 72 static void __exit nft_redir_ipv4_module_exit(void)
 73 {
 74         nft_unregister_expr(&nft_redir_ipv4_type);
 75 }
 76 
 77 module_init(nft_redir_ipv4_module_init);
 78 module_exit(nft_redir_ipv4_module_exit);
 79 
 80 MODULE_LICENSE("GPL");
 81 MODULE_AUTHOR("Arturo Borrero Gonzalez <arturo@debian.org>");
 82 MODULE_ALIAS_NFT_AF_EXPR(AF_INET, "redir");
 83 

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