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>
11 #include <uapi/linux/netfilter_bridge.h> /* NF_BR_PRE_ROUTING */
13 #include "../br_private.h"
15 static const struct net_device *
16 nft_meta_get_bridge(const struct net_device *dev)
18 if (dev && netif_is_bridge_port(dev))
19 return netdev_master_upper_dev_get_rcu((struct net_device *)dev);
24 static void nft_meta_bridge_get_eval(const struct nft_expr *expr,
25 struct nft_regs *regs,
26 const struct nft_pktinfo *pkt)
28 const struct nft_meta *priv = nft_expr_priv(expr);
29 const struct net_device *in = nft_in(pkt), *out = nft_out(pkt);
30 u32 *dest = ®s->data[priv->dreg];
31 const struct net_device *br_dev;
34 case NFT_META_BRI_IIFNAME:
35 br_dev = nft_meta_get_bridge(in);
37 case NFT_META_BRI_OIFNAME:
38 br_dev = nft_meta_get_bridge(out);
40 case NFT_META_BRI_IIFPVID: {
43 br_dev = nft_meta_get_bridge(in);
44 if (!br_dev || !br_vlan_enabled(br_dev))
47 br_vlan_get_pvid_rcu(in, &p_pvid);
48 nft_reg_store16(dest, p_pvid);
51 case NFT_META_BRI_IIFVPROTO: {
54 br_dev = nft_meta_get_bridge(in);
55 if (!br_dev || !br_vlan_enabled(br_dev))
58 br_vlan_get_proto(br_dev, &p_proto);
59 nft_reg_store_be16(dest, htons(p_proto));
63 return nft_meta_get_eval(expr, regs, pkt);
66 strncpy((char *)dest, br_dev ? br_dev->name : "", IFNAMSIZ);
69 regs->verdict.code = NFT_BREAK;
72 static int nft_meta_bridge_get_init(const struct nft_ctx *ctx,
73 const struct nft_expr *expr,
74 const struct nlattr * const tb[])
76 struct nft_meta *priv = nft_expr_priv(expr);
79 priv->key = ntohl(nla_get_be32(tb[NFTA_META_KEY]));
81 case NFT_META_BRI_IIFNAME:
82 case NFT_META_BRI_OIFNAME:
85 case NFT_META_BRI_IIFPVID:
86 case NFT_META_BRI_IIFVPROTO:
90 return nft_meta_get_init(ctx, expr, tb);
94 return nft_parse_register_store(ctx, tb[NFTA_META_DREG], &priv->dreg,
95 NULL, NFT_DATA_VALUE, len);
98 static struct nft_expr_type nft_meta_bridge_type;
99 static const struct nft_expr_ops nft_meta_bridge_get_ops = {
100 .type = &nft_meta_bridge_type,
101 .size = NFT_EXPR_SIZE(sizeof(struct nft_meta)),
102 .eval = nft_meta_bridge_get_eval,
103 .init = nft_meta_bridge_get_init,
104 .dump = nft_meta_get_dump,
105 .reduce = nft_meta_get_reduce,
108 static void nft_meta_bridge_set_eval(const struct nft_expr *expr,
109 struct nft_regs *regs,
110 const struct nft_pktinfo *pkt)
112 const struct nft_meta *meta = nft_expr_priv(expr);
113 u32 *sreg = ®s->data[meta->sreg];
114 struct sk_buff *skb = pkt->skb;
118 case NFT_META_BRI_BROUTE:
119 value8 = nft_reg_load8(sreg);
120 BR_INPUT_SKB_CB(skb)->br_netfilter_broute = !!value8;
123 nft_meta_set_eval(expr, regs, pkt);
127 static int nft_meta_bridge_set_init(const struct nft_ctx *ctx,
128 const struct nft_expr *expr,
129 const struct nlattr * const tb[])
131 struct nft_meta *priv = nft_expr_priv(expr);
135 priv->key = ntohl(nla_get_be32(tb[NFTA_META_KEY]));
137 case NFT_META_BRI_BROUTE:
141 return nft_meta_set_init(ctx, expr, tb);
145 err = nft_parse_register_load(tb[NFTA_META_SREG], &priv->sreg, len);
152 static bool nft_meta_bridge_set_reduce(struct nft_regs_track *track,
153 const struct nft_expr *expr)
157 for (i = 0; i < NFT_REG32_NUM; i++) {
158 if (!track->regs[i].selector)
161 if (track->regs[i].selector->ops != &nft_meta_bridge_get_ops)
164 __nft_reg_track_cancel(track, i);
170 static int nft_meta_bridge_set_validate(const struct nft_ctx *ctx,
171 const struct nft_expr *expr,
172 const struct nft_data **data)
174 struct nft_meta *priv = nft_expr_priv(expr);
178 case NFT_META_BRI_BROUTE:
179 hooks = 1 << NF_BR_PRE_ROUTING;
182 return nft_meta_set_validate(ctx, expr, data);
185 return nft_chain_validate_hooks(ctx->chain, hooks);
188 static const struct nft_expr_ops nft_meta_bridge_set_ops = {
189 .type = &nft_meta_bridge_type,
190 .size = NFT_EXPR_SIZE(sizeof(struct nft_meta)),
191 .eval = nft_meta_bridge_set_eval,
192 .init = nft_meta_bridge_set_init,
193 .destroy = nft_meta_set_destroy,
194 .dump = nft_meta_set_dump,
195 .reduce = nft_meta_bridge_set_reduce,
196 .validate = nft_meta_bridge_set_validate,
199 static const struct nft_expr_ops *
200 nft_meta_bridge_select_ops(const struct nft_ctx *ctx,
201 const struct nlattr * const tb[])
203 if (tb[NFTA_META_KEY] == NULL)
204 return ERR_PTR(-EINVAL);
206 if (tb[NFTA_META_DREG] && tb[NFTA_META_SREG])
207 return ERR_PTR(-EINVAL);
209 if (tb[NFTA_META_DREG])
210 return &nft_meta_bridge_get_ops;
212 if (tb[NFTA_META_SREG])
213 return &nft_meta_bridge_set_ops;
215 return ERR_PTR(-EINVAL);
218 static struct nft_expr_type nft_meta_bridge_type __read_mostly = {
219 .family = NFPROTO_BRIDGE,
221 .select_ops = nft_meta_bridge_select_ops,
222 .policy = nft_meta_policy,
223 .maxattr = NFTA_META_MAX,
224 .owner = THIS_MODULE,
227 static int __init nft_meta_bridge_module_init(void)
229 return nft_register_expr(&nft_meta_bridge_type);
232 static void __exit nft_meta_bridge_module_exit(void)
234 nft_unregister_expr(&nft_meta_bridge_type);
237 module_init(nft_meta_bridge_module_init);
238 module_exit(nft_meta_bridge_module_exit);
240 MODULE_LICENSE("GPL");
241 MODULE_AUTHOR("wenxu <wenxu@ucloud.cn>");
242 MODULE_ALIAS_NFT_AF_EXPR(AF_BRIDGE, "meta");
243 MODULE_DESCRIPTION("Support for bridge dedicated meta key");