projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 9ba1f726 AB |
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] = { | |
| 8a6bf5da PNA |
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 }, | |
| 9ba1f726 AB |
23 | }; |
| 24 | EXPORT_SYMBOL_GPL(nft_masq_policy); | |
| 25 | ||
| 75e8d06d PNA |
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 | ||
| 9ba1f726 AB |
41 | int nft_masq_init(const struct nft_ctx *ctx, |
| 42 | const struct nft_expr *expr, | |
| 43 | const struct nlattr * const tb[]) | |
| 44 | { | |
| 8a6bf5da | 45 | u32 plen = FIELD_SIZEOF(struct nf_nat_range, min_addr.all); |
| 9ba1f726 | 46 | struct nft_masq *priv = nft_expr_priv(expr); |
| 7210e4e3 PNA |
47 | int err; |
| 48 | ||
| 75e8d06d PNA |
49 | err = nft_masq_validate(ctx, expr, NULL); |
| 50 | if (err) | |
| 7210e4e3 | 51 | return err; |
| 9ba1f726 | 52 | |
| 8a6bf5da PNA |
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 | } | |
| 9ba1f726 AB |
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 | ||
| 8a6bf5da PNA |
88 | if (priv->flags != 0 && |
| 89 | nla_put_be32(skb, NFTA_MASQ_FLAGS, htonl(priv->flags))) | |
| 9ba1f726 AB |
90 | goto nla_put_failure; |
| 91 | ||
| 8a6bf5da PNA |
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 | ||
| 9ba1f726 AB |
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>"); |