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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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 | /* * Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net> * * 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. * * Development of this code funded by Astaro AG (http://www.astaro.com/) */ #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_tables_core.h> #include <net/netfilter/nf_tables.h> struct nft_immediate_expr { struct nft_data data; enum nft_registers dreg:8; u8 dlen; }; static void nft_immediate_eval(const struct nft_expr *expr, struct nft_regs *regs, const struct nft_pktinfo *pkt) { const struct nft_immediate_expr *priv = nft_expr_priv(expr); nft_data_copy(®s->data[priv->dreg], &priv->data, priv->dlen); } static const struct nla_policy nft_immediate_policy[NFTA_IMMEDIATE_MAX + 1] = { [NFTA_IMMEDIATE_DREG] = { .type = NLA_U32 }, [NFTA_IMMEDIATE_DATA] = { .type = NLA_NESTED }, }; static int nft_immediate_init(const struct nft_ctx *ctx, const struct nft_expr *expr, const struct nlattr * const tb[]) { struct nft_immediate_expr *priv = nft_expr_priv(expr); struct nft_data_desc desc; int err; if (tb[NFTA_IMMEDIATE_DREG] == NULL || tb[NFTA_IMMEDIATE_DATA] == NULL) return -EINVAL; err = nft_data_init(ctx, &priv->data, sizeof(priv->data), &desc, tb[NFTA_IMMEDIATE_DATA]); if (err < 0) return err; if (desc.len > U8_MAX) return -ERANGE; priv->dlen = desc.len; priv->dreg = nft_parse_register(tb[NFTA_IMMEDIATE_DREG]); err = nft_validate_register_store(ctx, priv->dreg, &priv->data, desc.type, desc.len); if (err < 0) goto err1; return 0; err1: nft_data_uninit(&priv->data, desc.type); return err; } static void nft_immediate_destroy(const struct nft_ctx *ctx, const struct nft_expr *expr) { const struct nft_immediate_expr *priv = nft_expr_priv(expr); return nft_data_uninit(&priv->data, nft_dreg_to_type(priv->dreg)); } static int nft_immediate_dump(struct sk_buff *skb, const struct nft_expr *expr) { const struct nft_immediate_expr *priv = nft_expr_priv(expr); if (nft_dump_register(skb, NFTA_IMMEDIATE_DREG, priv->dreg)) goto nla_put_failure; return nft_data_dump(skb, NFTA_IMMEDIATE_DATA, &priv->data, nft_dreg_to_type(priv->dreg), priv->dlen); nla_put_failure: return -1; } static int nft_immediate_validate(const struct nft_ctx *ctx, const struct nft_expr *expr, const struct nft_data **data) { const struct nft_immediate_expr *priv = nft_expr_priv(expr); if (priv->dreg == NFT_REG_VERDICT) *data = &priv->data; return 0; } static struct nft_expr_type nft_imm_type; static const struct nft_expr_ops nft_imm_ops = { .type = &nft_imm_type, .size = NFT_EXPR_SIZE(sizeof(struct nft_immediate_expr)), .eval = nft_immediate_eval, .init = nft_immediate_init, .destroy = nft_immediate_destroy, .dump = nft_immediate_dump, .validate = nft_immediate_validate, }; static struct nft_expr_type nft_imm_type __read_mostly = { .name = "immediate", .ops = &nft_imm_ops, .policy = nft_immediate_policy, .maxattr = NFTA_IMMEDIATE_MAX, .owner = THIS_MODULE, }; int __init nft_immediate_module_init(void) { return nft_register_expr(&nft_imm_type); } void nft_immediate_module_exit(void) { nft_unregister_expr(&nft_imm_type); } |