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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 (nft_pf(pkt)) {
 27         case NFPROTO_IPV4:
 28                 switch (priv->type) {
 29                 case NFT_REJECT_ICMP_UNREACH:
 30                         nf_send_unreach(pkt->skb, priv->icmp_code,
 31                                         nft_hook(pkt));
 32                         break;
 33                 case NFT_REJECT_TCP_RST:
 34                         nf_send_reset(nft_net(pkt), pkt->skb, nft_hook(pkt));
 35                         break;
 36                 case NFT_REJECT_ICMPX_UNREACH:
 37                         nf_send_unreach(pkt->skb,
 38                                         nft_reject_icmp_code(priv->icmp_code),
 39                                         nft_hook(pkt));
 40                         break;
 41                 }
 42                 break;
 43         case NFPROTO_IPV6:
 44                 switch (priv->type) {
 45                 case NFT_REJECT_ICMP_UNREACH:
 46                         nf_send_unreach6(nft_net(pkt), pkt->skb,
 47                                          priv->icmp_code, nft_hook(pkt));
 48                         break;
 49                 case NFT_REJECT_TCP_RST:
 50                         nf_send_reset6(nft_net(pkt), pkt->skb, nft_hook(pkt));
 51                         break;
 52                 case NFT_REJECT_ICMPX_UNREACH:
 53                         nf_send_unreach6(nft_net(pkt), pkt->skb,
 54                                          nft_reject_icmpv6_code(priv->icmp_code),
 55                                          nft_hook(pkt));
 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, err;
 70 
 71         err = nft_reject_validate(ctx, expr, NULL);
 72         if (err < 0)
 73                 return err;
 74 
 75         if (tb[NFTA_REJECT_TYPE] == NULL)
 76                 return -EINVAL;
 77 
 78         priv->type = ntohl(nla_get_be32(tb[NFTA_REJECT_TYPE]));
 79         switch (priv->type) {
 80         case NFT_REJECT_ICMP_UNREACH:
 81         case NFT_REJECT_ICMPX_UNREACH:
 82                 if (tb[NFTA_REJECT_ICMP_CODE] == NULL)
 83                         return -EINVAL;
 84 
 85                 icmp_code = nla_get_u8(tb[NFTA_REJECT_ICMP_CODE]);
 86                 if (priv->type == NFT_REJECT_ICMPX_UNREACH &&
 87                     icmp_code > NFT_REJECT_ICMPX_MAX)
 88                         return -EINVAL;
 89 
 90                 priv->icmp_code = icmp_code;
 91                 break;
 92         case NFT_REJECT_TCP_RST:
 93                 break;
 94         default:
 95                 return -EINVAL;
 96         }
 97         return 0;
 98 }
 99 
100 static int nft_reject_inet_dump(struct sk_buff *skb,
101                                 const struct nft_expr *expr)
102 {
103         const struct nft_reject *priv = nft_expr_priv(expr);
104 
105         if (nla_put_be32(skb, NFTA_REJECT_TYPE, htonl(priv->type)))
106                 goto nla_put_failure;
107 
108         switch (priv->type) {
109         case NFT_REJECT_ICMP_UNREACH:
110         case NFT_REJECT_ICMPX_UNREACH:
111                 if (nla_put_u8(skb, NFTA_REJECT_ICMP_CODE, priv->icmp_code))
112                         goto nla_put_failure;
113                 break;
114         default:
115                 break;
116         }
117 
118         return 0;
119 
120 nla_put_failure:
121         return -1;
122 }
123 
124 static struct nft_expr_type nft_reject_inet_type;
125 static const struct nft_expr_ops nft_reject_inet_ops = {
126         .type           = &nft_reject_inet_type,
127         .size           = NFT_EXPR_SIZE(sizeof(struct nft_reject)),
128         .eval           = nft_reject_inet_eval,
129         .init           = nft_reject_inet_init,
130         .dump           = nft_reject_inet_dump,
131         .validate       = nft_reject_validate,
132 };
133 
134 static struct nft_expr_type nft_reject_inet_type __read_mostly = {
135         .family         = NFPROTO_INET,
136         .name           = "reject",
137         .ops            = &nft_reject_inet_ops,
138         .policy         = nft_reject_policy,
139         .maxattr        = NFTA_REJECT_MAX,
140         .owner          = THIS_MODULE,
141 };
142 
143 static int __init nft_reject_inet_module_init(void)
144 {
145         return nft_register_expr(&nft_reject_inet_type);
146 }
147 
148 static void __exit nft_reject_inet_module_exit(void)
149 {
150         nft_unregister_expr(&nft_reject_inet_type);
151 }
152 
153 module_init(nft_reject_inet_module_init);
154 module_exit(nft_reject_inet_module_exit);
155 
156 MODULE_LICENSE("GPL");
157 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
158 MODULE_ALIAS_NFT_AF_EXPR(1, "reject");
159 

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