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Linux/net/netfilter/nft_reject_inet.c

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  1 /*
  2  * Copyright (c) 2014 Patrick McHardy <kaber@trash.net>
  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/nft_reject.h>
 17 #include <net/netfilter/ipv4/nf_reject.h>
 18 #include <net/netfilter/ipv6/nf_reject.h>
 19 
 20 static void nft_reject_inet_eval(const struct nft_expr *expr,
 21                                  struct nft_regs *regs,
 22                                  const struct nft_pktinfo *pkt)
 23 {
 24         struct nft_reject *priv = nft_expr_priv(expr);
 25 
 26         switch (pkt->pf) {
 27         case NFPROTO_IPV4:
 28                 switch (priv->type) {
 29                 case NFT_REJECT_ICMP_UNREACH:
 30                         nf_send_unreach(pkt->skb, priv->icmp_code,
 31                                         pkt->hook);
 32                         break;
 33                 case NFT_REJECT_TCP_RST:
 34                         nf_send_reset(pkt->net, pkt->skb, pkt->hook);
 35                         break;
 36                 case NFT_REJECT_ICMPX_UNREACH:
 37                         nf_send_unreach(pkt->skb,
 38                                         nft_reject_icmp_code(priv->icmp_code),
 39                                         pkt->hook);
 40                         break;
 41                 }
 42                 break;
 43         case NFPROTO_IPV6:
 44                 switch (priv->type) {
 45                 case NFT_REJECT_ICMP_UNREACH:
 46                         nf_send_unreach6(pkt->net, pkt->skb, priv->icmp_code,
 47                                          pkt->hook);
 48                         break;
 49                 case NFT_REJECT_TCP_RST:
 50                         nf_send_reset6(pkt->net, pkt->skb, pkt->hook);
 51                         break;
 52                 case NFT_REJECT_ICMPX_UNREACH:
 53                         nf_send_unreach6(pkt->net, pkt->skb,
 54                                          nft_reject_icmpv6_code(priv->icmp_code),
 55                                          pkt->hook);
 56                         break;
 57                 }
 58                 break;
 59         }
 60 
 61         regs->verdict.code = NF_DROP;
 62 }
 63 
 64 static int nft_reject_inet_init(const struct nft_ctx *ctx,
 65                                 const struct nft_expr *expr,
 66                                 const struct nlattr * const tb[])
 67 {
 68         struct nft_reject *priv = nft_expr_priv(expr);
 69         int icmp_code;
 70 
 71         if (tb[NFTA_REJECT_TYPE] == NULL)
 72                 return -EINVAL;
 73 
 74         priv->type = ntohl(nla_get_be32(tb[NFTA_REJECT_TYPE]));
 75         switch (priv->type) {
 76         case NFT_REJECT_ICMP_UNREACH:
 77         case NFT_REJECT_ICMPX_UNREACH:
 78                 if (tb[NFTA_REJECT_ICMP_CODE] == NULL)
 79                         return -EINVAL;
 80 
 81                 icmp_code = nla_get_u8(tb[NFTA_REJECT_ICMP_CODE]);
 82                 if (priv->type == NFT_REJECT_ICMPX_UNREACH &&
 83                     icmp_code > NFT_REJECT_ICMPX_MAX)
 84                         return -EINVAL;
 85 
 86                 priv->icmp_code = icmp_code;
 87                 break;
 88         case NFT_REJECT_TCP_RST:
 89                 break;
 90         default:
 91                 return -EINVAL;
 92         }
 93         return 0;
 94 }
 95 
 96 static int nft_reject_inet_dump(struct sk_buff *skb,
 97                                 const struct nft_expr *expr)
 98 {
 99         const struct nft_reject *priv = nft_expr_priv(expr);
100 
101         if (nla_put_be32(skb, NFTA_REJECT_TYPE, htonl(priv->type)))
102                 goto nla_put_failure;
103 
104         switch (priv->type) {
105         case NFT_REJECT_ICMP_UNREACH:
106         case NFT_REJECT_ICMPX_UNREACH:
107                 if (nla_put_u8(skb, NFTA_REJECT_ICMP_CODE, priv->icmp_code))
108                         goto nla_put_failure;
109                 break;
110         default:
111                 break;
112         }
113 
114         return 0;
115 
116 nla_put_failure:
117         return -1;
118 }
119 
120 static struct nft_expr_type nft_reject_inet_type;
121 static const struct nft_expr_ops nft_reject_inet_ops = {
122         .type           = &nft_reject_inet_type,
123         .size           = NFT_EXPR_SIZE(sizeof(struct nft_reject)),
124         .eval           = nft_reject_inet_eval,
125         .init           = nft_reject_inet_init,
126         .dump           = nft_reject_inet_dump,
127 };
128 
129 static struct nft_expr_type nft_reject_inet_type __read_mostly = {
130         .family         = NFPROTO_INET,
131         .name           = "reject",
132         .ops            = &nft_reject_inet_ops,
133         .policy         = nft_reject_policy,
134         .maxattr        = NFTA_REJECT_MAX,
135         .owner          = THIS_MODULE,
136 };
137 
138 static int __init nft_reject_inet_module_init(void)
139 {
140         return nft_register_expr(&nft_reject_inet_type);
141 }
142 
143 static void __exit nft_reject_inet_module_exit(void)
144 {
145         nft_unregister_expr(&nft_reject_inet_type);
146 }
147 
148 module_init(nft_reject_inet_module_init);
149 module_exit(nft_reject_inet_module_exit);
150 
151 MODULE_LICENSE("GPL");
152 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
153 MODULE_ALIAS_NFT_AF_EXPR(1, "reject");
154 

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