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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 | /* * Copyright (c) 2014 Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include <linux/kernel.h> #include <linux/init.h> #include <linux/module.h> #include <linux/netlink.h> #include <linux/netfilter.h> #include <linux/netfilter/nf_tables.h> #include <net/netfilter/nf_nat.h> #include <net/netfilter/nf_tables.h> #include <net/netfilter/nft_redir.h> const struct nla_policy nft_redir_policy[NFTA_REDIR_MAX + 1] = { [NFTA_REDIR_REG_PROTO_MIN] = { .type = NLA_U32 }, [NFTA_REDIR_REG_PROTO_MAX] = { .type = NLA_U32 }, [NFTA_REDIR_FLAGS] = { .type = NLA_U32 }, }; EXPORT_SYMBOL_GPL(nft_redir_policy); int nft_redir_validate(const struct nft_ctx *ctx, const struct nft_expr *expr, const struct nft_data **data) { int err; err = nft_chain_validate_dependency(ctx->chain, NFT_CHAIN_T_NAT); if (err < 0) return err; return nft_chain_validate_hooks(ctx->chain, (1 << NF_INET_PRE_ROUTING) | (1 << NF_INET_LOCAL_OUT)); } EXPORT_SYMBOL_GPL(nft_redir_validate); int nft_redir_init(const struct nft_ctx *ctx, const struct nft_expr *expr, const struct nlattr * const tb[]) { struct nft_redir *priv = nft_expr_priv(expr); int err; err = nft_redir_validate(ctx, expr, NULL); if (err < 0) return err; if (tb[NFTA_REDIR_REG_PROTO_MIN]) { priv->sreg_proto_min = ntohl(nla_get_be32(tb[NFTA_REDIR_REG_PROTO_MIN])); err = nft_validate_input_register(priv->sreg_proto_min); if (err < 0) return err; if (tb[NFTA_REDIR_REG_PROTO_MAX]) { priv->sreg_proto_max = ntohl(nla_get_be32(tb[NFTA_REDIR_REG_PROTO_MAX])); err = nft_validate_input_register(priv->sreg_proto_max); if (err < 0) return err; } else { priv->sreg_proto_max = priv->sreg_proto_min; } } if (tb[NFTA_REDIR_FLAGS]) { priv->flags = ntohl(nla_get_be32(tb[NFTA_REDIR_FLAGS])); if (priv->flags & ~NF_NAT_RANGE_MASK) return -EINVAL; } return 0; } EXPORT_SYMBOL_GPL(nft_redir_init); int nft_redir_dump(struct sk_buff *skb, const struct nft_expr *expr) { const struct nft_redir *priv = nft_expr_priv(expr); if (priv->sreg_proto_min) { if (nla_put_be32(skb, NFTA_REDIR_REG_PROTO_MIN, htonl(priv->sreg_proto_min))) goto nla_put_failure; if (nla_put_be32(skb, NFTA_REDIR_REG_PROTO_MAX, htonl(priv->sreg_proto_max))) goto nla_put_failure; } if (priv->flags != 0 && nla_put_be32(skb, NFTA_REDIR_FLAGS, htonl(priv->flags))) goto nla_put_failure; return 0; nla_put_failure: return -1; } EXPORT_SYMBOL_GPL(nft_redir_dump); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>"); |