1 /* 2 * Copyright (c) 2014 Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com> 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_nat.h> 16 #include <net/netfilter/nf_tables.h> 17 #include <net/netfilter/nft_redir.h> 18 19 const struct nla_policy nft_redir_policy[NFTA_REDIR_MAX + 1] = { 20 [NFTA_REDIR_REG_PROTO_MIN] = { .type = NLA_U32 }, 21 [NFTA_REDIR_REG_PROTO_MAX] = { .type = NLA_U32 }, 22 [NFTA_REDIR_FLAGS] = { .type = NLA_U32 }, 23 }; 24 EXPORT_SYMBOL_GPL(nft_redir_policy); 25 26 int nft_redir_validate(const struct nft_ctx *ctx, 27 const struct nft_expr *expr, 28 const struct nft_data **data) 29 { 30 int err; 31 32 err = nft_chain_validate_dependency(ctx->chain, NFT_CHAIN_T_NAT); 33 if (err < 0) 34 return err; 35 36 return nft_chain_validate_hooks(ctx->chain, 37 (1 << NF_INET_PRE_ROUTING) | 38 (1 << NF_INET_LOCAL_OUT)); 39 } 40 EXPORT_SYMBOL_GPL(nft_redir_validate); 41 42 int nft_redir_init(const struct nft_ctx *ctx, 43 const struct nft_expr *expr, 44 const struct nlattr * const tb[]) 45 { 46 struct nft_redir *priv = nft_expr_priv(expr); 47 unsigned int plen; 48 int err; 49 50 err = nft_redir_validate(ctx, expr, NULL); 51 if (err < 0) 52 return err; 53 54 plen = FIELD_SIZEOF(struct nf_nat_range, min_addr.all); 55 if (tb[NFTA_REDIR_REG_PROTO_MIN]) { 56 priv->sreg_proto_min = 57 nft_parse_register(tb[NFTA_REDIR_REG_PROTO_MIN]); 58 59 err = nft_validate_register_load(priv->sreg_proto_min, plen); 60 if (err < 0) 61 return err; 62 63 if (tb[NFTA_REDIR_REG_PROTO_MAX]) { 64 priv->sreg_proto_max = 65 nft_parse_register(tb[NFTA_REDIR_REG_PROTO_MAX]); 66 67 err = nft_validate_register_load(priv->sreg_proto_max, 68 plen); 69 if (err < 0) 70 return err; 71 } else { 72 priv->sreg_proto_max = priv->sreg_proto_min; 73 } 74 } 75 76 if (tb[NFTA_REDIR_FLAGS]) { 77 priv->flags = ntohl(nla_get_be32(tb[NFTA_REDIR_FLAGS])); 78 if (priv->flags & ~NF_NAT_RANGE_MASK) 79 return -EINVAL; 80 } 81 82 return 0; 83 } 84 EXPORT_SYMBOL_GPL(nft_redir_init); 85 86 int nft_redir_dump(struct sk_buff *skb, const struct nft_expr *expr) 87 { 88 const struct nft_redir *priv = nft_expr_priv(expr); 89 90 if (priv->sreg_proto_min) { 91 if (nft_dump_register(skb, NFTA_REDIR_REG_PROTO_MIN, 92 priv->sreg_proto_min)) 93 goto nla_put_failure; 94 if (nft_dump_register(skb, NFTA_REDIR_REG_PROTO_MAX, 95 priv->sreg_proto_max)) 96 goto nla_put_failure; 97 } 98 99 if (priv->flags != 0 && 100 nla_put_be32(skb, NFTA_REDIR_FLAGS, htonl(priv->flags))) 101 goto nla_put_failure; 102 103 return 0; 104 105 nla_put_failure: 106 return -1; 107 } 108 EXPORT_SYMBOL_GPL(nft_redir_dump); 109 110 MODULE_LICENSE("GPL"); 111 MODULE_AUTHOR("Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>"); 112