projects / deliverable / linux.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/nft_masq.h> | |
| 17 | #include <net/netfilter/ipv4/nf_nat_masquerade.h> | |
| 18 | ||
| 19 | static void nft_masq_ipv4_eval(const struct nft_expr *expr, | |
| 20 | struct nft_data data[NFT_REG_MAX + 1], | |
| 21 | const struct nft_pktinfo *pkt) | |
| 22 | { | |
| 23 | struct nft_masq *priv = nft_expr_priv(expr); | |
| 24 | struct nf_nat_range range; | |
| 25 | unsigned int verdict; | |
| 26 | ||
| 27 | range.flags = priv->flags; | |
| 28 | ||
| 29 | verdict = nf_nat_masquerade_ipv4(pkt->skb, pkt->ops->hooknum, | |
| 30 | &range, pkt->out); | |
| 31 | ||
| 32 | data[NFT_REG_VERDICT].verdict = verdict; | |
| 33 | } | |
| 34 | ||
| 35 | static int nft_masq_ipv4_init(const struct nft_ctx *ctx, | |
| 36 | const struct nft_expr *expr, | |
| 37 | const struct nlattr * const tb[]) | |
| 38 | { | |
| 39 | int err; | |
| 40 | ||
| 41 | err = nft_masq_init(ctx, expr, tb); | |
| 42 | if (err < 0) | |
| 43 | return err; | |
| 44 | ||
| 45 | nf_nat_masquerade_ipv4_register_notifier(); | |
| 46 | return 0; | |
| 47 | } | |
| 48 | ||
| 49 | static void nft_masq_ipv4_destroy(const struct nft_ctx *ctx, | |
| 50 | const struct nft_expr *expr) | |
| 51 | { | |
| 52 | nf_nat_masquerade_ipv4_unregister_notifier(); | |
| 53 | } | |
| 54 | ||
| 55 | static struct nft_expr_type nft_masq_ipv4_type; | |
| 56 | static const struct nft_expr_ops nft_masq_ipv4_ops = { | |
| 57 | .type = &nft_masq_ipv4_type, | |
| 58 | .size = NFT_EXPR_SIZE(sizeof(struct nft_masq)), | |
| 59 | .eval = nft_masq_ipv4_eval, | |
| 60 | .init = nft_masq_ipv4_init, | |
| 61 | .destroy = nft_masq_ipv4_destroy, | |
| 62 | .dump = nft_masq_dump, | |
| 63 | }; | |
| 64 | ||
| 65 | static struct nft_expr_type nft_masq_ipv4_type __read_mostly = { | |
| 66 | .family = NFPROTO_IPV4, | |
| 67 | .name = "masq", | |
| 68 | .ops = &nft_masq_ipv4_ops, | |
| 69 | .policy = nft_masq_policy, | |
| 70 | .maxattr = NFTA_MASQ_MAX, | |
| 71 | .owner = THIS_MODULE, | |
| 72 | }; | |
| 73 | ||
| 74 | static int __init nft_masq_ipv4_module_init(void) | |
| 75 | { | |
| 76 | return nft_register_expr(&nft_masq_ipv4_type); | |
| 77 | } | |
| 78 | ||
| 79 | static void __exit nft_masq_ipv4_module_exit(void) | |
| 80 | { | |
| 81 | nft_unregister_expr(&nft_masq_ipv4_type); | |
| 82 | } | |
| 83 | ||
| 84 | module_init(nft_masq_ipv4_module_init); | |
| 85 | module_exit(nft_masq_ipv4_module_exit); | |
| 86 | ||
| 87 | MODULE_LICENSE("GPL"); | |
| 88 | MODULE_AUTHOR("Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>"); | |
| 89 | MODULE_ALIAS_NFT_AF_EXPR(AF_INET, "masq"); |