projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 39e6dea2 PNA |
1 | /* |
| 2 | * Copyright (c) 2015 Pablo Neira Ayuso <[email protected]> | |
| 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/nf_dup_netdev.h> | |
| 17 | ||
| 18 | struct nft_fwd_netdev { | |
| 19 | enum nft_registers sreg_dev:8; | |
| 20 | }; | |
| 21 | ||
| 22 | static void nft_fwd_netdev_eval(const struct nft_expr *expr, | |
| 23 | struct nft_regs *regs, | |
| 24 | const struct nft_pktinfo *pkt) | |
| 25 | { | |
| 26 | struct nft_fwd_netdev *priv = nft_expr_priv(expr); | |
| 27 | int oif = regs->data[priv->sreg_dev]; | |
| 28 | ||
| 3bf32761 FW |
29 | nf_fwd_netdev_egress(pkt, oif); |
| 30 | regs->verdict.code = NF_STOLEN; | |
| 39e6dea2 PNA |
31 | } |
| 32 | ||
| 33 | static const struct nla_policy nft_fwd_netdev_policy[NFTA_FWD_MAX + 1] = { | |
| 34 | [NFTA_FWD_SREG_DEV] = { .type = NLA_U32 }, | |
| 35 | }; | |
| 36 | ||
| 37 | static int nft_fwd_netdev_init(const struct nft_ctx *ctx, | |
| 38 | const struct nft_expr *expr, | |
| 39 | const struct nlattr * const tb[]) | |
| 40 | { | |
| 41 | struct nft_fwd_netdev *priv = nft_expr_priv(expr); | |
| 42 | ||
| 43 | if (tb[NFTA_FWD_SREG_DEV] == NULL) | |
| 44 | return -EINVAL; | |
| 45 | ||
| 46 | priv->sreg_dev = nft_parse_register(tb[NFTA_FWD_SREG_DEV]); | |
| 47 | return nft_validate_register_load(priv->sreg_dev, sizeof(int)); | |
| 48 | } | |
| 49 | ||
| 50 | static const struct nft_expr_ops nft_fwd_netdev_ingress_ops; | |
| 51 | ||
| 52 | static int nft_fwd_netdev_dump(struct sk_buff *skb, const struct nft_expr *expr) | |
| 53 | { | |
| 54 | struct nft_fwd_netdev *priv = nft_expr_priv(expr); | |
| 55 | ||
| 56 | if (nft_dump_register(skb, NFTA_FWD_SREG_DEV, priv->sreg_dev)) | |
| 57 | goto nla_put_failure; | |
| 58 | ||
| 59 | return 0; | |
| 60 | ||
| 61 | nla_put_failure: | |
| 62 | return -1; | |
| 63 | } | |
| 64 | ||
| 65 | static struct nft_expr_type nft_fwd_netdev_type; | |
| 66 | static const struct nft_expr_ops nft_fwd_netdev_ops = { | |
| 67 | .type = &nft_fwd_netdev_type, | |
| 68 | .size = NFT_EXPR_SIZE(sizeof(struct nft_fwd_netdev)), | |
| 69 | .eval = nft_fwd_netdev_eval, | |
| 70 | .init = nft_fwd_netdev_init, | |
| 71 | .dump = nft_fwd_netdev_dump, | |
| 72 | }; | |
| 73 | ||
| 74 | static struct nft_expr_type nft_fwd_netdev_type __read_mostly = { | |
| 75 | .family = NFPROTO_NETDEV, | |
| 76 | .name = "fwd", | |
| 77 | .ops = &nft_fwd_netdev_ops, | |
| 78 | .policy = nft_fwd_netdev_policy, | |
| 79 | .maxattr = NFTA_FWD_MAX, | |
| 80 | .owner = THIS_MODULE, | |
| 81 | }; | |
| 82 | ||
| 83 | static int __init nft_fwd_netdev_module_init(void) | |
| 84 | { | |
| 85 | return nft_register_expr(&nft_fwd_netdev_type); | |
| 86 | } | |
| 87 | ||
| 88 | static void __exit nft_fwd_netdev_module_exit(void) | |
| 89 | { | |
| 90 | nft_unregister_expr(&nft_fwd_netdev_type); | |
| 91 | } | |
| 92 | ||
| 93 | module_init(nft_fwd_netdev_module_init); | |
| 94 | module_exit(nft_fwd_netdev_module_exit); | |
| 95 | ||
| 96 | MODULE_LICENSE("GPL"); | |
| 97 | MODULE_AUTHOR("Pablo Neira Ayuso <[email protected]>"); | |
| 98 | MODULE_ALIAS_NFT_AF_EXPR(5, "fwd"); |