Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2009 Patrick McHardy <kaber@trash.net> |
| 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 | * Development of this code funded by Astaro AG (http://www.astaro.com/) |
| 9 | */ |
| 10 | |
| 11 | #include <linux/kernel.h> |
| 12 | #include <linux/init.h> |
| 13 | #include <linux/list.h> |
| 14 | #include <linux/rbtree.h> |
| 15 | #include <linux/netlink.h> |
| 16 | #include <linux/netfilter.h> |
| 17 | #include <linux/netfilter/nf_tables.h> |
| 18 | #include <net/netfilter/nf_tables.h> |
Rashika Kheria | bd76ed3 | 2014-02-09 22:31:42 +0530 | [diff] [blame] | 19 | #include <net/netfilter/nf_tables_core.h> |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 20 | |
| 21 | struct nft_lookup { |
| 22 | struct nft_set *set; |
| 23 | enum nft_registers sreg:8; |
| 24 | enum nft_registers dreg:8; |
| 25 | struct nft_set_binding binding; |
| 26 | }; |
| 27 | |
| 28 | static void nft_lookup_eval(const struct nft_expr *expr, |
Patrick McHardy | a55e22e | 2015-04-11 02:27:31 +0100 | [diff] [blame] | 29 | struct nft_regs *regs, |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 30 | const struct nft_pktinfo *pkt) |
| 31 | { |
| 32 | const struct nft_lookup *priv = nft_expr_priv(expr); |
| 33 | const struct nft_set *set = priv->set; |
Patrick McHardy | b2832dd | 2015-03-25 14:08:48 +0000 | [diff] [blame] | 34 | const struct nft_set_ext *ext; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 35 | |
Patrick McHardy | a55e22e | 2015-04-11 02:27:31 +0100 | [diff] [blame] | 36 | if (set->ops->lookup(set, ®s->data[priv->sreg], &ext)) { |
Patrick McHardy | b2832dd | 2015-03-25 14:08:48 +0000 | [diff] [blame] | 37 | if (set->flags & NFT_SET_MAP) |
Patrick McHardy | a55e22e | 2015-04-11 02:27:31 +0100 | [diff] [blame] | 38 | nft_data_copy(®s->data[priv->dreg], |
Patrick McHardy | 49499c3 | 2015-04-11 02:27:37 +0100 | [diff] [blame] | 39 | nft_set_ext_data(ext), set->dlen); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 40 | return; |
Patrick McHardy | b2832dd | 2015-03-25 14:08:48 +0000 | [diff] [blame] | 41 | } |
Patrick McHardy | a55e22e | 2015-04-11 02:27:31 +0100 | [diff] [blame] | 42 | regs->verdict.code = NFT_BREAK; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 43 | } |
| 44 | |
| 45 | static const struct nla_policy nft_lookup_policy[NFTA_LOOKUP_MAX + 1] = { |
| 46 | [NFTA_LOOKUP_SET] = { .type = NLA_STRING }, |
Patrick McHardy | 4c1017a | 2015-01-30 07:46:33 +0000 | [diff] [blame] | 47 | [NFTA_LOOKUP_SET_ID] = { .type = NLA_U32 }, |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 48 | [NFTA_LOOKUP_SREG] = { .type = NLA_U32 }, |
| 49 | [NFTA_LOOKUP_DREG] = { .type = NLA_U32 }, |
| 50 | }; |
| 51 | |
| 52 | static int nft_lookup_init(const struct nft_ctx *ctx, |
| 53 | const struct nft_expr *expr, |
| 54 | const struct nlattr * const tb[]) |
| 55 | { |
| 56 | struct nft_lookup *priv = nft_expr_priv(expr); |
| 57 | struct nft_set *set; |
| 58 | int err; |
| 59 | |
| 60 | if (tb[NFTA_LOOKUP_SET] == NULL || |
| 61 | tb[NFTA_LOOKUP_SREG] == NULL) |
| 62 | return -EINVAL; |
| 63 | |
| 64 | set = nf_tables_set_lookup(ctx->table, tb[NFTA_LOOKUP_SET]); |
Pablo Neira Ayuso | 958bee1 | 2014-04-03 11:48:44 +0200 | [diff] [blame] | 65 | if (IS_ERR(set)) { |
| 66 | if (tb[NFTA_LOOKUP_SET_ID]) { |
| 67 | set = nf_tables_set_lookup_byid(ctx->net, |
| 68 | tb[NFTA_LOOKUP_SET_ID]); |
| 69 | } |
| 70 | if (IS_ERR(set)) |
| 71 | return PTR_ERR(set); |
| 72 | } |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 73 | |
Patrick McHardy | 7c6c6e9 | 2015-04-11 10:46:41 +0100 | [diff] [blame] | 74 | if (set->flags & NFT_SET_EVAL) |
| 75 | return -EOPNOTSUPP; |
| 76 | |
Patrick McHardy | b1c96ed | 2015-04-11 02:27:36 +0100 | [diff] [blame] | 77 | priv->sreg = nft_parse_register(tb[NFTA_LOOKUP_SREG]); |
Patrick McHardy | d07db98 | 2015-04-11 02:27:30 +0100 | [diff] [blame] | 78 | err = nft_validate_register_load(priv->sreg, set->klen); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 79 | if (err < 0) |
| 80 | return err; |
| 81 | |
| 82 | if (tb[NFTA_LOOKUP_DREG] != NULL) { |
| 83 | if (!(set->flags & NFT_SET_MAP)) |
| 84 | return -EINVAL; |
| 85 | |
Patrick McHardy | b1c96ed | 2015-04-11 02:27:36 +0100 | [diff] [blame] | 86 | priv->dreg = nft_parse_register(tb[NFTA_LOOKUP_DREG]); |
Patrick McHardy | 58f40ab | 2015-04-11 02:27:28 +0100 | [diff] [blame] | 87 | err = nft_validate_register_store(ctx, priv->dreg, NULL, |
| 88 | set->dtype, set->dlen); |
| 89 | if (err < 0) |
| 90 | return err; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 91 | } else if (set->flags & NFT_SET_MAP) |
| 92 | return -EINVAL; |
| 93 | |
Patrick McHardy | 11113e1 | 2015-04-05 14:41:07 +0200 | [diff] [blame] | 94 | priv->binding.flags = set->flags & NFT_SET_MAP; |
| 95 | |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 96 | err = nf_tables_bind_set(ctx, set, &priv->binding); |
| 97 | if (err < 0) |
| 98 | return err; |
| 99 | |
| 100 | priv->set = set; |
| 101 | return 0; |
| 102 | } |
| 103 | |
Patrick McHardy | 62472bc | 2014-03-07 19:08:30 +0100 | [diff] [blame] | 104 | static void nft_lookup_destroy(const struct nft_ctx *ctx, |
| 105 | const struct nft_expr *expr) |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 106 | { |
| 107 | struct nft_lookup *priv = nft_expr_priv(expr); |
| 108 | |
Patrick McHardy | ab9da5c1 | 2014-03-07 19:08:31 +0100 | [diff] [blame] | 109 | nf_tables_unbind_set(ctx, priv->set, &priv->binding); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 110 | } |
| 111 | |
| 112 | static int nft_lookup_dump(struct sk_buff *skb, const struct nft_expr *expr) |
| 113 | { |
| 114 | const struct nft_lookup *priv = nft_expr_priv(expr); |
| 115 | |
| 116 | if (nla_put_string(skb, NFTA_LOOKUP_SET, priv->set->name)) |
| 117 | goto nla_put_failure; |
Patrick McHardy | b1c96ed | 2015-04-11 02:27:36 +0100 | [diff] [blame] | 118 | if (nft_dump_register(skb, NFTA_LOOKUP_SREG, priv->sreg)) |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 119 | goto nla_put_failure; |
| 120 | if (priv->set->flags & NFT_SET_MAP) |
Patrick McHardy | b1c96ed | 2015-04-11 02:27:36 +0100 | [diff] [blame] | 121 | if (nft_dump_register(skb, NFTA_LOOKUP_DREG, priv->dreg)) |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 122 | goto nla_put_failure; |
| 123 | return 0; |
| 124 | |
| 125 | nla_put_failure: |
| 126 | return -1; |
| 127 | } |
| 128 | |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 129 | static struct nft_expr_type nft_lookup_type; |
| 130 | static const struct nft_expr_ops nft_lookup_ops = { |
| 131 | .type = &nft_lookup_type, |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 132 | .size = NFT_EXPR_SIZE(sizeof(struct nft_lookup)), |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 133 | .eval = nft_lookup_eval, |
| 134 | .init = nft_lookup_init, |
| 135 | .destroy = nft_lookup_destroy, |
| 136 | .dump = nft_lookup_dump, |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 137 | }; |
| 138 | |
| 139 | static struct nft_expr_type nft_lookup_type __read_mostly = { |
| 140 | .name = "lookup", |
| 141 | .ops = &nft_lookup_ops, |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 142 | .policy = nft_lookup_policy, |
| 143 | .maxattr = NFTA_LOOKUP_MAX, |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 144 | .owner = THIS_MODULE, |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 145 | }; |
| 146 | |
| 147 | int __init nft_lookup_module_init(void) |
| 148 | { |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 149 | return nft_register_expr(&nft_lookup_type); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 150 | } |
| 151 | |
| 152 | void nft_lookup_module_exit(void) |
| 153 | { |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 154 | nft_unregister_expr(&nft_lookup_type); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 155 | } |