1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/kernel.h>
3 #include <linux/init.h>
4 #include <linux/module.h>
5 #include <linux/netlink.h>
6 #include <linux/netfilter.h>
7 #include <linux/netfilter/nf_tables.h>
8 #include <net/netfilter/nf_tables.h>
9 #include <net/netfilter/nft_meta.h>
10 #include <linux/if_bridge.h>
12 static const struct net_device *
13 nft_meta_get_bridge(const struct net_device *dev)
15 if (dev && netif_is_bridge_port(dev))
16 return netdev_master_upper_dev_get_rcu((struct net_device *)dev);
21 static void nft_meta_bridge_get_eval(const struct nft_expr *expr,
22 struct nft_regs *regs,
23 const struct nft_pktinfo *pkt)
25 const struct nft_meta *priv = nft_expr_priv(expr);
26 const struct net_device *in = nft_in(pkt), *out = nft_out(pkt);
27 u32 *dest = ®s->data[priv->dreg];
28 const struct net_device *br_dev;
31 case NFT_META_BRI_IIFNAME:
32 br_dev = nft_meta_get_bridge(in);
34 case NFT_META_BRI_OIFNAME:
35 br_dev = nft_meta_get_bridge(out);
37 case NFT_META_BRI_IIFPVID: {
40 br_dev = nft_meta_get_bridge(in);
41 if (!br_dev || !br_vlan_enabled(br_dev))
44 br_vlan_get_pvid_rcu(in, &p_pvid);
45 nft_reg_store16(dest, p_pvid);
48 case NFT_META_BRI_IIFVPROTO: {
51 br_dev = nft_meta_get_bridge(in);
52 if (!br_dev || !br_vlan_enabled(br_dev))
55 br_vlan_get_proto(br_dev, &p_proto);
56 nft_reg_store_be16(dest, htons(p_proto));
60 return nft_meta_get_eval(expr, regs, pkt);
63 strncpy((char *)dest, br_dev ? br_dev->name : "", IFNAMSIZ);
66 regs->verdict.code = NFT_BREAK;
69 static int nft_meta_bridge_get_init(const struct nft_ctx *ctx,
70 const struct nft_expr *expr,
71 const struct nlattr * const tb[])
73 struct nft_meta *priv = nft_expr_priv(expr);
76 priv->key = ntohl(nla_get_be32(tb[NFTA_META_KEY]));
78 case NFT_META_BRI_IIFNAME:
79 case NFT_META_BRI_OIFNAME:
82 case NFT_META_BRI_IIFPVID:
83 case NFT_META_BRI_IIFVPROTO:
87 return nft_meta_get_init(ctx, expr, tb);
91 return nft_parse_register_store(ctx, tb[NFTA_META_DREG], &priv->dreg,
92 NULL, NFT_DATA_VALUE, len);
95 static struct nft_expr_type nft_meta_bridge_type;
96 static const struct nft_expr_ops nft_meta_bridge_get_ops = {
97 .type = &nft_meta_bridge_type,
98 .size = NFT_EXPR_SIZE(sizeof(struct nft_meta)),
99 .eval = nft_meta_bridge_get_eval,
100 .init = nft_meta_bridge_get_init,
101 .dump = nft_meta_get_dump,
102 .reduce = nft_meta_get_reduce,
105 static bool nft_meta_bridge_set_reduce(struct nft_regs_track *track,
106 const struct nft_expr *expr)
110 for (i = 0; i < NFT_REG32_NUM; i++) {
111 if (!track->regs[i].selector)
114 if (track->regs[i].selector->ops != &nft_meta_bridge_get_ops)
117 __nft_reg_track_cancel(track, i);
123 static const struct nft_expr_ops nft_meta_bridge_set_ops = {
124 .type = &nft_meta_bridge_type,
125 .size = NFT_EXPR_SIZE(sizeof(struct nft_meta)),
126 .eval = nft_meta_set_eval,
127 .init = nft_meta_set_init,
128 .destroy = nft_meta_set_destroy,
129 .dump = nft_meta_set_dump,
130 .reduce = nft_meta_bridge_set_reduce,
131 .validate = nft_meta_set_validate,
134 static const struct nft_expr_ops *
135 nft_meta_bridge_select_ops(const struct nft_ctx *ctx,
136 const struct nlattr * const tb[])
138 if (tb[NFTA_META_KEY] == NULL)
139 return ERR_PTR(-EINVAL);
141 if (tb[NFTA_META_DREG] && tb[NFTA_META_SREG])
142 return ERR_PTR(-EINVAL);
144 if (tb[NFTA_META_DREG])
145 return &nft_meta_bridge_get_ops;
147 if (tb[NFTA_META_SREG])
148 return &nft_meta_bridge_set_ops;
150 return ERR_PTR(-EINVAL);
153 static struct nft_expr_type nft_meta_bridge_type __read_mostly = {
154 .family = NFPROTO_BRIDGE,
156 .select_ops = nft_meta_bridge_select_ops,
157 .policy = nft_meta_policy,
158 .maxattr = NFTA_META_MAX,
159 .owner = THIS_MODULE,
162 static int __init nft_meta_bridge_module_init(void)
164 return nft_register_expr(&nft_meta_bridge_type);
167 static void __exit nft_meta_bridge_module_exit(void)
169 nft_unregister_expr(&nft_meta_bridge_type);
172 module_init(nft_meta_bridge_module_init);
173 module_exit(nft_meta_bridge_module_exit);
175 MODULE_LICENSE("GPL");
176 MODULE_AUTHOR("wenxu <wenxu@ucloud.cn>");
177 MODULE_ALIAS_NFT_AF_EXPR(AF_BRIDGE, "meta");
178 MODULE_DESCRIPTION("Support for bridge dedicated meta key");