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_tables.h> 16 #include <net/netfilter/nf_nat.h> 17 #include <net/netfilter/nft_masq.h> 18 19 const struct nla_policy nft_masq_policy[NFTA_MASQ_MAX + 1] = { 20 [NFTA_MASQ_FLAGS] = { .type = NLA_U32 }, 21 [NFTA_MASQ_REG_PROTO_MIN] = { .type = NLA_U32 }, 22 [NFTA_MASQ_REG_PROTO_MAX] = { .type = NLA_U32 }, 23 }; 24 EXPORT_SYMBOL_GPL(nft_masq_policy); 25 26 int nft_masq_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_POST_ROUTING)); 38 } 39 EXPORT_SYMBOL_GPL(nft_masq_validate); 40 41 int nft_masq_init(const struct nft_ctx *ctx, 42 const struct nft_expr *expr, 43 const struct nlattr * const tb[]) 44 { 45 u32 plen = FIELD_SIZEOF(struct nf_nat_range, min_addr.all); 46 struct nft_masq *priv = nft_expr_priv(expr); 47 int err; 48 49 err = nft_masq_validate(ctx, expr, NULL); 50 if (err) 51 return err; 52 53 if (tb[NFTA_MASQ_FLAGS]) { 54 priv->flags = ntohl(nla_get_be32(tb[NFTA_MASQ_FLAGS])); 55 if (priv->flags & ~NF_NAT_RANGE_MASK) 56 return -EINVAL; 57 } 58 59 if (tb[NFTA_MASQ_REG_PROTO_MIN]) { 60 priv->sreg_proto_min = 61 nft_parse_register(tb[NFTA_MASQ_REG_PROTO_MIN]); 62 63 err = nft_validate_register_load(priv->sreg_proto_min, plen); 64 if (err < 0) 65 return err; 66 67 if (tb[NFTA_MASQ_REG_PROTO_MAX]) { 68 priv->sreg_proto_max = 69 nft_parse_register(tb[NFTA_MASQ_REG_PROTO_MAX]); 70 71 err = nft_validate_register_load(priv->sreg_proto_max, 72 plen); 73 if (err < 0) 74 return err; 75 } else { 76 priv->sreg_proto_max = priv->sreg_proto_min; 77 } 78 } 79 80 return 0; 81 } 82 EXPORT_SYMBOL_GPL(nft_masq_init); 83 84 int nft_masq_dump(struct sk_buff *skb, const struct nft_expr *expr) 85 { 86 const struct nft_masq *priv = nft_expr_priv(expr); 87 88 if (priv->flags != 0 && 89 nla_put_be32(skb, NFTA_MASQ_FLAGS, htonl(priv->flags))) 90 goto nla_put_failure; 91 92 if (priv->sreg_proto_min) { 93 if (nft_dump_register(skb, NFTA_MASQ_REG_PROTO_MIN, 94 priv->sreg_proto_min) || 95 nft_dump_register(skb, NFTA_MASQ_REG_PROTO_MAX, 96 priv->sreg_proto_max)) 97 goto nla_put_failure; 98 } 99 100 return 0; 101 102 nla_put_failure: 103 return -1; 104 } 105 EXPORT_SYMBOL_GPL(nft_masq_dump); 106 107 MODULE_LICENSE("GPL"); 108 MODULE_AUTHOR("Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>"); 109