1 /* 2 * Copyright (c) 2015 Pablo Neira Ayuso <pablo@netfilter.org> 3 * 4 * This program is free software; you can redistribute it and/or modify it 5 * under the terms of the GNU General Public License version 2 as published by 6 * 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/ipv6/nf_dup_ipv6.h> 17 18 struct nft_dup_ipv6 { 19 enum nft_registers sreg_addr:8; 20 enum nft_registers sreg_dev:8; 21 }; 22 23 static void nft_dup_ipv6_eval(const struct nft_expr *expr, 24 struct nft_regs *regs, 25 const struct nft_pktinfo *pkt) 26 { 27 struct nft_dup_ipv6 *priv = nft_expr_priv(expr); 28 struct in6_addr *gw = (struct in6_addr *)®s->data[priv->sreg_addr]; 29 int oif = priv->sreg_dev ? regs->data[priv->sreg_dev] : -1; 30 31 nf_dup_ipv6(nft_net(pkt), pkt->skb, nft_hook(pkt), gw, oif); 32 } 33 34 static int nft_dup_ipv6_init(const struct nft_ctx *ctx, 35 const struct nft_expr *expr, 36 const struct nlattr * const tb[]) 37 { 38 struct nft_dup_ipv6 *priv = nft_expr_priv(expr); 39 int err; 40 41 if (tb[NFTA_DUP_SREG_ADDR] == NULL) 42 return -EINVAL; 43 44 priv->sreg_addr = nft_parse_register(tb[NFTA_DUP_SREG_ADDR]); 45 err = nft_validate_register_load(priv->sreg_addr, sizeof(struct in6_addr)); 46 if (err < 0) 47 return err; 48 49 if (tb[NFTA_DUP_SREG_DEV] != NULL) { 50 priv->sreg_dev = nft_parse_register(tb[NFTA_DUP_SREG_DEV]); 51 return nft_validate_register_load(priv->sreg_dev, sizeof(int)); 52 } 53 return 0; 54 } 55 56 static int nft_dup_ipv6_dump(struct sk_buff *skb, const struct nft_expr *expr) 57 { 58 struct nft_dup_ipv6 *priv = nft_expr_priv(expr); 59 60 if (nft_dump_register(skb, NFTA_DUP_SREG_ADDR, priv->sreg_addr)) 61 goto nla_put_failure; 62 if (priv->sreg_dev && 63 nft_dump_register(skb, NFTA_DUP_SREG_DEV, priv->sreg_dev)) 64 goto nla_put_failure; 65 66 return 0; 67 68 nla_put_failure: 69 return -1; 70 } 71 72 static struct nft_expr_type nft_dup_ipv6_type; 73 static const struct nft_expr_ops nft_dup_ipv6_ops = { 74 .type = &nft_dup_ipv6_type, 75 .size = NFT_EXPR_SIZE(sizeof(struct nft_dup_ipv6)), 76 .eval = nft_dup_ipv6_eval, 77 .init = nft_dup_ipv6_init, 78 .dump = nft_dup_ipv6_dump, 79 }; 80 81 static const struct nla_policy nft_dup_ipv6_policy[NFTA_DUP_MAX + 1] = { 82 [NFTA_DUP_SREG_ADDR] = { .type = NLA_U32 }, 83 [NFTA_DUP_SREG_DEV] = { .type = NLA_U32 }, 84 }; 85 86 static struct nft_expr_type nft_dup_ipv6_type __read_mostly = { 87 .family = NFPROTO_IPV6, 88 .name = "dup", 89 .ops = &nft_dup_ipv6_ops, 90 .policy = nft_dup_ipv6_policy, 91 .maxattr = NFTA_DUP_MAX, 92 .owner = THIS_MODULE, 93 }; 94 95 static int __init nft_dup_ipv6_module_init(void) 96 { 97 return nft_register_expr(&nft_dup_ipv6_type); 98 } 99 100 static void __exit nft_dup_ipv6_module_exit(void) 101 { 102 nft_unregister_expr(&nft_dup_ipv6_type); 103 } 104 105 module_init(nft_dup_ipv6_module_init); 106 module_exit(nft_dup_ipv6_module_exit); 107 108 MODULE_LICENSE("GPL"); 109 MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>"); 110 MODULE_ALIAS_NFT_AF_EXPR(AF_INET6, "dup"); 111