| /* |
| * Copyright (c) 2014 Intel Corporation |
| * |
| * 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. |
| * |
| */ |
| |
| #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.h> |
| #include <net/netfilter/nft_meta.h> |
| |
| #include "../br_private.h" |
| |
| static void nft_meta_bridge_get_eval(const struct nft_expr *expr, |
| struct nft_data data[NFT_REG_MAX + 1], |
| const struct nft_pktinfo *pkt) |
| { |
| const struct nft_meta *priv = nft_expr_priv(expr); |
| const struct net_device *in = pkt->in, *out = pkt->out; |
| struct nft_data *dest = &data[priv->dreg]; |
| const struct net_bridge_port *p; |
| |
| switch (priv->key) { |
| case NFT_META_BRI_IIFNAME: |
| if (in == NULL || (p = br_port_get_rcu(in)) == NULL) |
| goto err; |
| break; |
| case NFT_META_BRI_OIFNAME: |
| if (out == NULL || (p = br_port_get_rcu(out)) == NULL) |
| goto err; |
| break; |
| default: |
| goto out; |
| } |
| |
| strncpy((char *)dest->data, p->br->dev->name, sizeof(dest->data)); |
| return; |
| out: |
| return nft_meta_get_eval(expr, data, pkt); |
| err: |
| data[NFT_REG_VERDICT].verdict = NFT_BREAK; |
| } |
| |
| static int nft_meta_bridge_get_init(const struct nft_ctx *ctx, |
| const struct nft_expr *expr, |
| const struct nlattr * const tb[]) |
| { |
| struct nft_meta *priv = nft_expr_priv(expr); |
| int err; |
| |
| priv->key = ntohl(nla_get_be32(tb[NFTA_META_KEY])); |
| switch (priv->key) { |
| case NFT_META_BRI_IIFNAME: |
| case NFT_META_BRI_OIFNAME: |
| break; |
| default: |
| return nft_meta_get_init(ctx, expr, tb); |
| } |
| |
| priv->dreg = ntohl(nla_get_be32(tb[NFTA_META_DREG])); |
| err = nft_validate_output_register(priv->dreg); |
| if (err < 0) |
| return err; |
| |
| err = nft_validate_data_load(ctx, priv->dreg, NULL, NFT_DATA_VALUE); |
| if (err < 0) |
| return err; |
| |
| return 0; |
| } |
| |
| static struct nft_expr_type nft_meta_bridge_type; |
| static const struct nft_expr_ops nft_meta_bridge_get_ops = { |
| .type = &nft_meta_bridge_type, |
| .size = NFT_EXPR_SIZE(sizeof(struct nft_meta)), |
| .eval = nft_meta_bridge_get_eval, |
| .init = nft_meta_bridge_get_init, |
| .dump = nft_meta_get_dump, |
| }; |
| |
| static const struct nft_expr_ops nft_meta_bridge_set_ops = { |
| .type = &nft_meta_bridge_type, |
| .size = NFT_EXPR_SIZE(sizeof(struct nft_meta)), |
| .eval = nft_meta_set_eval, |
| .init = nft_meta_set_init, |
| .dump = nft_meta_set_dump, |
| }; |
| |
| static const struct nft_expr_ops * |
| nft_meta_bridge_select_ops(const struct nft_ctx *ctx, |
| const struct nlattr * const tb[]) |
| { |
| if (tb[NFTA_META_KEY] == NULL) |
| return ERR_PTR(-EINVAL); |
| |
| if (tb[NFTA_META_DREG] && tb[NFTA_META_SREG]) |
| return ERR_PTR(-EINVAL); |
| |
| if (tb[NFTA_META_DREG]) |
| return &nft_meta_bridge_get_ops; |
| |
| if (tb[NFTA_META_SREG]) |
| return &nft_meta_bridge_set_ops; |
| |
| return ERR_PTR(-EINVAL); |
| } |
| |
| static struct nft_expr_type nft_meta_bridge_type __read_mostly = { |
| .family = NFPROTO_BRIDGE, |
| .name = "meta", |
| .select_ops = &nft_meta_bridge_select_ops, |
| .policy = nft_meta_policy, |
| .maxattr = NFTA_META_MAX, |
| .owner = THIS_MODULE, |
| }; |
| |
| static int __init nft_meta_bridge_module_init(void) |
| { |
| return nft_register_expr(&nft_meta_bridge_type); |
| } |
| |
| static void __exit nft_meta_bridge_module_exit(void) |
| { |
| nft_unregister_expr(&nft_meta_bridge_type); |
| } |
| |
| module_init(nft_meta_bridge_module_init); |
| module_exit(nft_meta_bridge_module_exit); |
| |
| MODULE_LICENSE("GPL"); |
| MODULE_AUTHOR("Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>"); |
| MODULE_ALIAS_NFT_AF_EXPR(AF_BRIDGE, "meta"); |