1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net> 4 * Copyright (c) 2013 Eric Leblond <eric@regit.org> 5 * 6 * Development of this code funded by Astaro AG (http://www.astaro.com/) 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/ipv6/nf_reject.h> 18 19 static void nft_reject_ipv6_eval(const struct nft_expr *expr, 20 struct nft_regs *regs, 21 const struct nft_pktinfo *pkt) 22 { 23 struct nft_reject *priv = nft_expr_priv(expr); 24 25 switch (priv->type) { 26 case NFT_REJECT_ICMP_UNREACH: 27 nf_send_unreach6(nft_net(pkt), pkt->skb, priv->icmp_code, 28 nft_hook(pkt)); 29 break; 30 case NFT_REJECT_TCP_RST: 31 nf_send_reset6(nft_net(pkt), nft_sk(pkt), pkt->skb, 32 nft_hook(pkt)); 33 break; 34 default: 35 break; 36 } 37 38 regs->verdict.code = NF_DROP; 39 } 40 41 static struct nft_expr_type nft_reject_ipv6_type; 42 static const struct nft_expr_ops nft_reject_ipv6_ops = { 43 .type = &nft_reject_ipv6_type, 44 .size = NFT_EXPR_SIZE(sizeof(struct nft_reject)), 45 .eval = nft_reject_ipv6_eval, 46 .init = nft_reject_init, 47 .dump = nft_reject_dump, 48 .validate = nft_reject_validate, 49 .reduce = NFT_REDUCE_READONLY, 50 }; 51 52 static struct nft_expr_type nft_reject_ipv6_type __read_mostly = { 53 .family = NFPROTO_IPV6, 54 .name = "reject", 55 .ops = &nft_reject_ipv6_ops, 56 .policy = nft_reject_policy, 57 .maxattr = NFTA_REJECT_MAX, 58 .owner = THIS_MODULE, 59 }; 60 61 static int __init nft_reject_ipv6_module_init(void) 62 { 63 return nft_register_expr(&nft_reject_ipv6_type); 64 } 65 66 static void __exit nft_reject_ipv6_module_exit(void) 67 { 68 nft_unregister_expr(&nft_reject_ipv6_type); 69 } 70 71 module_init(nft_reject_ipv6_module_init); 72 module_exit(nft_reject_ipv6_module_exit); 73 74 MODULE_LICENSE("GPL"); 75 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); 76 MODULE_ALIAS_NFT_AF_EXPR(AF_INET6, "reject"); 77 MODULE_DESCRIPTION("IPv6 packet rejection for nftables"); 78