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Linux/net/netfilter/nft_reject_inet.c

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  1 // SPDX-License-Identifier: GPL-2.0-only
  2 /*
  3  * Copyright (c) 2014 Patrick McHardy <kaber@trash.net>
  4  */
  5 
  6 #include <linux/kernel.h>
  7 #include <linux/init.h>
  8 #include <linux/module.h>
  9 #include <linux/netlink.h>
 10 #include <linux/netfilter.h>
 11 #include <linux/netfilter/nf_tables.h>
 12 #include <net/netfilter/nf_tables.h>
 13 #include <net/netfilter/nft_reject.h>
 14 #include <net/netfilter/ipv4/nf_reject.h>
 15 #include <net/netfilter/ipv6/nf_reject.h>
 16 
 17 static void nft_reject_inet_eval(const struct nft_expr *expr,
 18                                  struct nft_regs *regs,
 19                                  const struct nft_pktinfo *pkt)
 20 {
 21         struct nft_reject *priv = nft_expr_priv(expr);
 22 
 23         switch (nft_pf(pkt)) {
 24         case NFPROTO_IPV4:
 25                 switch (priv->type) {
 26                 case NFT_REJECT_ICMP_UNREACH:
 27                         nf_send_unreach(pkt->skb, priv->icmp_code,
 28                                         nft_hook(pkt));
 29                         break;
 30                 case NFT_REJECT_TCP_RST:
 31                         nf_send_reset(nft_net(pkt), pkt->skb, nft_hook(pkt));
 32                         break;
 33                 case NFT_REJECT_ICMPX_UNREACH:
 34                         nf_send_unreach(pkt->skb,
 35                                         nft_reject_icmp_code(priv->icmp_code),
 36                                         nft_hook(pkt));
 37                         break;
 38                 }
 39                 break;
 40         case NFPROTO_IPV6:
 41                 switch (priv->type) {
 42                 case NFT_REJECT_ICMP_UNREACH:
 43                         nf_send_unreach6(nft_net(pkt), pkt->skb,
 44                                          priv->icmp_code, nft_hook(pkt));
 45                         break;
 46                 case NFT_REJECT_TCP_RST:
 47                         nf_send_reset6(nft_net(pkt), pkt->skb, nft_hook(pkt));
 48                         break;
 49                 case NFT_REJECT_ICMPX_UNREACH:
 50                         nf_send_unreach6(nft_net(pkt), pkt->skb,
 51                                          nft_reject_icmpv6_code(priv->icmp_code),
 52                                          nft_hook(pkt));
 53                         break;
 54                 }
 55                 break;
 56         }
 57 
 58         regs->verdict.code = NF_DROP;
 59 }
 60 
 61 static int nft_reject_inet_init(const struct nft_ctx *ctx,
 62                                 const struct nft_expr *expr,
 63                                 const struct nlattr * const tb[])
 64 {
 65         struct nft_reject *priv = nft_expr_priv(expr);
 66         int icmp_code;
 67 
 68         if (tb[NFTA_REJECT_TYPE] == NULL)
 69                 return -EINVAL;
 70 
 71         priv->type = ntohl(nla_get_be32(tb[NFTA_REJECT_TYPE]));
 72         switch (priv->type) {
 73         case NFT_REJECT_ICMP_UNREACH:
 74         case NFT_REJECT_ICMPX_UNREACH:
 75                 if (tb[NFTA_REJECT_ICMP_CODE] == NULL)
 76                         return -EINVAL;
 77 
 78                 icmp_code = nla_get_u8(tb[NFTA_REJECT_ICMP_CODE]);
 79                 if (priv->type == NFT_REJECT_ICMPX_UNREACH &&
 80                     icmp_code > NFT_REJECT_ICMPX_MAX)
 81                         return -EINVAL;
 82 
 83                 priv->icmp_code = icmp_code;
 84                 break;
 85         case NFT_REJECT_TCP_RST:
 86                 break;
 87         default:
 88                 return -EINVAL;
 89         }
 90         return 0;
 91 }
 92 
 93 static int nft_reject_inet_dump(struct sk_buff *skb,
 94                                 const struct nft_expr *expr)
 95 {
 96         const struct nft_reject *priv = nft_expr_priv(expr);
 97 
 98         if (nla_put_be32(skb, NFTA_REJECT_TYPE, htonl(priv->type)))
 99                 goto nla_put_failure;
100 
101         switch (priv->type) {
102         case NFT_REJECT_ICMP_UNREACH:
103         case NFT_REJECT_ICMPX_UNREACH:
104                 if (nla_put_u8(skb, NFTA_REJECT_ICMP_CODE, priv->icmp_code))
105                         goto nla_put_failure;
106                 break;
107         default:
108                 break;
109         }
110 
111         return 0;
112 
113 nla_put_failure:
114         return -1;
115 }
116 
117 static struct nft_expr_type nft_reject_inet_type;
118 static const struct nft_expr_ops nft_reject_inet_ops = {
119         .type           = &nft_reject_inet_type,
120         .size           = NFT_EXPR_SIZE(sizeof(struct nft_reject)),
121         .eval           = nft_reject_inet_eval,
122         .init           = nft_reject_inet_init,
123         .dump           = nft_reject_inet_dump,
124         .validate       = nft_reject_validate,
125 };
126 
127 static struct nft_expr_type nft_reject_inet_type __read_mostly = {
128         .family         = NFPROTO_INET,
129         .name           = "reject",
130         .ops            = &nft_reject_inet_ops,
131         .policy         = nft_reject_policy,
132         .maxattr        = NFTA_REJECT_MAX,
133         .owner          = THIS_MODULE,
134 };
135 
136 static int __init nft_reject_inet_module_init(void)
137 {
138         return nft_register_expr(&nft_reject_inet_type);
139 }
140 
141 static void __exit nft_reject_inet_module_exit(void)
142 {
143         nft_unregister_expr(&nft_reject_inet_type);
144 }
145 
146 module_init(nft_reject_inet_module_init);
147 module_exit(nft_reject_inet_module_exit);
148 
149 MODULE_LICENSE("GPL");
150 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
151 MODULE_ALIAS_NFT_AF_EXPR(1, "reject");
152 

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