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- // SPDX-License-Identifier: GPL-2.0
- #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 <linux/if_bridge.h>
- static const struct net_device *
- nft_meta_get_bridge(const struct net_device *dev)
- {
- if (dev && netif_is_bridge_port(dev))
- return netdev_master_upper_dev_get_rcu((struct net_device *)dev);
- return NULL;
- }
- static void nft_meta_bridge_get_eval(const struct nft_expr *expr,
- struct nft_regs *regs,
- const struct nft_pktinfo *pkt)
- {
- const struct nft_meta *priv = nft_expr_priv(expr);
- const struct net_device *in = nft_in(pkt), *out = nft_out(pkt);
- u32 *dest = ®s->data[priv->dreg];
- const struct net_device *br_dev;
- switch (priv->key) {
- case NFT_META_BRI_IIFNAME:
- br_dev = nft_meta_get_bridge(in);
- break;
- case NFT_META_BRI_OIFNAME:
- br_dev = nft_meta_get_bridge(out);
- break;
- case NFT_META_BRI_IIFPVID: {
- u16 p_pvid;
- br_dev = nft_meta_get_bridge(in);
- if (!br_dev || !br_vlan_enabled(br_dev))
- goto err;
- br_vlan_get_pvid_rcu(in, &p_pvid);
- nft_reg_store16(dest, p_pvid);
- return;
- }
- case NFT_META_BRI_IIFVPROTO: {
- u16 p_proto;
- br_dev = nft_meta_get_bridge(in);
- if (!br_dev || !br_vlan_enabled(br_dev))
- goto err;
- br_vlan_get_proto(br_dev, &p_proto);
- nft_reg_store16(dest, htons(p_proto));
- return;
- }
- default:
- return nft_meta_get_eval(expr, regs, pkt);
- }
- strncpy((char *)dest, br_dev ? br_dev->name : "", IFNAMSIZ);
- return;
- err:
- regs->verdict.code = 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);
- unsigned int len;
- priv->key = ntohl(nla_get_be32(tb[NFTA_META_KEY]));
- switch (priv->key) {
- case NFT_META_BRI_IIFNAME:
- case NFT_META_BRI_OIFNAME:
- len = IFNAMSIZ;
- break;
- case NFT_META_BRI_IIFPVID:
- case NFT_META_BRI_IIFVPROTO:
- len = sizeof(u16);
- break;
- default:
- return nft_meta_get_init(ctx, expr, tb);
- }
- priv->dreg = nft_parse_register(tb[NFTA_META_DREG]);
- return nft_validate_register_store(ctx, priv->dreg, NULL,
- NFT_DATA_VALUE, len);
- }
- 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,
- .destroy = nft_meta_set_destroy,
- .dump = nft_meta_set_dump,
- .validate = nft_meta_set_validate,
- };
- 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("wenxu <wenxu@ucloud.cn>");
- MODULE_ALIAS_NFT_AF_EXPR(AF_BRIDGE, "meta");
- MODULE_DESCRIPTION("Support for bridge dedicated meta key");
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