projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| d877f071 PNA |
1 | /* |
| 2 | * Copyright (c) 2015 Pablo Neira Ayuso <pablo@netfilter.org> | |
| 3 | * | |
| 4 | * This program is free software; you can redistribute it and/or modify it | |
| 5 | * under the terms of the GNU General Public License version 2 as published by | |
| 6 | * 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/ipv4/nf_dup_ipv4.h> | |
| 17 | ||
| 18 | struct nft_dup_ipv4 { | |
| 19 | enum nft_registers sreg_addr:8; | |
| 20 | enum nft_registers sreg_dev:8; | |
| 21 | }; | |
| 22 | ||
| 23 | static void nft_dup_ipv4_eval(const struct nft_expr *expr, | |
| 24 | struct nft_regs *regs, | |
| 25 | const struct nft_pktinfo *pkt) | |
| 26 | { | |
| 27 | struct nft_dup_ipv4 *priv = nft_expr_priv(expr); | |
| 28 | struct in_addr gw = { | |
| 59e26423 | 29 | .s_addr = (__force __be32)regs->data[priv->sreg_addr], |
| d877f071 PNA |
30 | }; |
| 31 | int oif = regs->data[priv->sreg_dev]; | |
| 32 | ||
| 206e8c00 | 33 | nf_dup_ipv4(pkt->net, pkt->skb, pkt->hook, &gw, oif); |
| d877f071 PNA |
34 | } |
| 35 | ||
| 36 | static int nft_dup_ipv4_init(const struct nft_ctx *ctx, | |
| 37 | const struct nft_expr *expr, | |
| 38 | const struct nlattr * const tb[]) | |
| 39 | { | |
| 40 | struct nft_dup_ipv4 *priv = nft_expr_priv(expr); | |
| 41 | int err; | |
| 42 | ||
| 43 | if (tb[NFTA_DUP_SREG_ADDR] == NULL) | |
| 44 | return -EINVAL; | |
| 45 | ||
| 46 | priv->sreg_addr = nft_parse_register(tb[NFTA_DUP_SREG_ADDR]); | |
| 47 | err = nft_validate_register_load(priv->sreg_addr, sizeof(struct in_addr)); | |
| 48 | if (err < 0) | |
| 49 | return err; | |
| 50 | ||
| 51 | if (tb[NFTA_DUP_SREG_DEV] != NULL) { | |
| 52 | priv->sreg_dev = nft_parse_register(tb[NFTA_DUP_SREG_DEV]); | |
| 53 | return nft_validate_register_load(priv->sreg_dev, sizeof(int)); | |
| 54 | } | |
| 55 | return 0; | |
| 56 | } | |
| 57 | ||
| 58 | static int nft_dup_ipv4_dump(struct sk_buff *skb, const struct nft_expr *expr) | |
| 59 | { | |
| 60 | struct nft_dup_ipv4 *priv = nft_expr_priv(expr); | |
| 61 | ||
| 62 | if (nft_dump_register(skb, NFTA_DUP_SREG_ADDR, priv->sreg_addr) || | |
| 63 | nft_dump_register(skb, NFTA_DUP_SREG_DEV, priv->sreg_dev)) | |
| 64 | goto nla_put_failure; | |
| 65 | ||
| 66 | return 0; | |
| 67 | ||
| 68 | nla_put_failure: | |
| 69 | return -1; | |
| 70 | } | |
| 71 | ||
| 72 | static struct nft_expr_type nft_dup_ipv4_type; | |
| 73 | static const struct nft_expr_ops nft_dup_ipv4_ops = { | |
| 74 | .type = &nft_dup_ipv4_type, | |
| 75 | .size = NFT_EXPR_SIZE(sizeof(struct nft_dup_ipv4)), | |
| 76 | .eval = nft_dup_ipv4_eval, | |
| 77 | .init = nft_dup_ipv4_init, | |
| 78 | .dump = nft_dup_ipv4_dump, | |
| 79 | }; | |
| 80 | ||
| 81 | static const struct nla_policy nft_dup_ipv4_policy[NFTA_DUP_MAX + 1] = { | |
| 82 | [NFTA_DUP_SREG_ADDR] = { .type = NLA_U32 }, | |
| 83 | [NFTA_DUP_SREG_DEV] = { .type = NLA_U32 }, | |
| 84 | }; | |
| 85 | ||
| 86 | static struct nft_expr_type nft_dup_ipv4_type __read_mostly = { | |
| 87 | .family = NFPROTO_IPV4, | |
| 88 | .name = "dup", | |
| 89 | .ops = &nft_dup_ipv4_ops, | |
| 90 | .policy = nft_dup_ipv4_policy, | |
| 91 | .maxattr = NFTA_DUP_MAX, | |
| 92 | .owner = THIS_MODULE, | |
| 93 | }; | |
| 94 | ||
| 95 | static int __init nft_dup_ipv4_module_init(void) | |
| 96 | { | |
| 97 | return nft_register_expr(&nft_dup_ipv4_type); | |
| 98 | } | |
| 99 | ||
| 100 | static void __exit nft_dup_ipv4_module_exit(void) | |
| 101 | { | |
| 102 | nft_unregister_expr(&nft_dup_ipv4_type); | |
| 103 | } | |
| 104 | ||
| 105 | module_init(nft_dup_ipv4_module_init); | |
| 106 | module_exit(nft_dup_ipv4_module_exit); | |
| 107 | ||
| 108 | MODULE_LICENSE("GPL"); | |
| 109 | MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>"); | |
| 110 | MODULE_ALIAS_NFT_AF_EXPR(AF_INET, "dup"); |