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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 *
4 * Generic part shared by ipv4 and ipv6 backends.
5 */
6
7#include <linux/kernel.h>
8#include <linux/init.h>
9#include <linux/module.h>
10#include <linux/netlink.h>
11#include <linux/netfilter.h>
12#include <linux/netfilter/nf_tables.h>
13#include <net/netfilter/nf_tables_core.h>
14#include <net/netfilter/nf_tables.h>
15#include <net/netfilter/nft_fib.h>
16
17const struct nla_policy nft_fib_policy[NFTA_FIB_MAX + 1] = {
18 [NFTA_FIB_DREG] = { .type = NLA_U32 },
19 [NFTA_FIB_RESULT] = { .type = NLA_U32 },
20 [NFTA_FIB_FLAGS] = { .type = NLA_U32 },
21};
22EXPORT_SYMBOL(nft_fib_policy);
23
24#define NFTA_FIB_F_ALL (NFTA_FIB_F_SADDR | NFTA_FIB_F_DADDR | \
25 NFTA_FIB_F_MARK | NFTA_FIB_F_IIF | NFTA_FIB_F_OIF | \
26 NFTA_FIB_F_PRESENT)
27
28int nft_fib_validate(const struct nft_ctx *ctx, const struct nft_expr *expr,
29 const struct nft_data **data)
30{
31 const struct nft_fib *priv = nft_expr_priv(expr);
32 unsigned int hooks;
33
34 switch (priv->result) {
35 case NFT_FIB_RESULT_OIF:
36 case NFT_FIB_RESULT_OIFNAME:
37 hooks = (1 << NF_INET_PRE_ROUTING);
38 break;
39 case NFT_FIB_RESULT_ADDRTYPE:
40 if (priv->flags & NFTA_FIB_F_IIF)
41 hooks = (1 << NF_INET_PRE_ROUTING) |
42 (1 << NF_INET_LOCAL_IN) |
43 (1 << NF_INET_FORWARD);
44 else if (priv->flags & NFTA_FIB_F_OIF)
45 hooks = (1 << NF_INET_LOCAL_OUT) |
46 (1 << NF_INET_POST_ROUTING) |
47 (1 << NF_INET_FORWARD);
48 else
49 hooks = (1 << NF_INET_LOCAL_IN) |
50 (1 << NF_INET_LOCAL_OUT) |
51 (1 << NF_INET_FORWARD) |
52 (1 << NF_INET_PRE_ROUTING) |
53 (1 << NF_INET_POST_ROUTING);
54
55 break;
56 default:
57 return -EINVAL;
58 }
59
60 return nft_chain_validate_hooks(ctx->chain, hooks);
61}
62EXPORT_SYMBOL_GPL(nft_fib_validate);
63
64int nft_fib_init(const struct nft_ctx *ctx, const struct nft_expr *expr,
65 const struct nlattr * const tb[])
66{
67 struct nft_fib *priv = nft_expr_priv(expr);
68 unsigned int len;
69 int err;
70
71 if (!tb[NFTA_FIB_DREG] || !tb[NFTA_FIB_RESULT] || !tb[NFTA_FIB_FLAGS])
72 return -EINVAL;
73
74 priv->flags = ntohl(nla_get_be32(tb[NFTA_FIB_FLAGS]));
75
76 if (priv->flags == 0 || (priv->flags & ~NFTA_FIB_F_ALL))
77 return -EINVAL;
78
79 if ((priv->flags & (NFTA_FIB_F_SADDR | NFTA_FIB_F_DADDR)) ==
80 (NFTA_FIB_F_SADDR | NFTA_FIB_F_DADDR))
81 return -EINVAL;
82 if ((priv->flags & (NFTA_FIB_F_IIF | NFTA_FIB_F_OIF)) ==
83 (NFTA_FIB_F_IIF | NFTA_FIB_F_OIF))
84 return -EINVAL;
85 if ((priv->flags & (NFTA_FIB_F_SADDR | NFTA_FIB_F_DADDR)) == 0)
86 return -EINVAL;
87
88 priv->result = ntohl(nla_get_be32(tb[NFTA_FIB_RESULT]));
89
90 switch (priv->result) {
91 case NFT_FIB_RESULT_OIF:
92 if (priv->flags & NFTA_FIB_F_OIF)
93 return -EINVAL;
94 len = sizeof(int);
95 break;
96 case NFT_FIB_RESULT_OIFNAME:
97 if (priv->flags & NFTA_FIB_F_OIF)
98 return -EINVAL;
99 len = IFNAMSIZ;
100 break;
101 case NFT_FIB_RESULT_ADDRTYPE:
102 len = sizeof(u32);
103 break;
104 default:
105 return -EINVAL;
106 }
107
108 err = nft_parse_register_store(ctx, tb[NFTA_FIB_DREG], &priv->dreg,
109 NULL, NFT_DATA_VALUE, len);
110 if (err < 0)
111 return err;
112
113 return 0;
114}
115EXPORT_SYMBOL_GPL(nft_fib_init);
116
117int nft_fib_dump(struct sk_buff *skb, const struct nft_expr *expr)
118{
119 const struct nft_fib *priv = nft_expr_priv(expr);
120
121 if (nft_dump_register(skb, NFTA_FIB_DREG, priv->dreg))
122 return -1;
123
124 if (nla_put_be32(skb, NFTA_FIB_RESULT, htonl(priv->result)))
125 return -1;
126
127 if (nla_put_be32(skb, NFTA_FIB_FLAGS, htonl(priv->flags)))
128 return -1;
129
130 return 0;
131}
132EXPORT_SYMBOL_GPL(nft_fib_dump);
133
134void nft_fib_store_result(void *reg, const struct nft_fib *priv,
135 const struct net_device *dev)
136{
137 u32 *dreg = reg;
138 int index;
139
140 switch (priv->result) {
141 case NFT_FIB_RESULT_OIF:
142 index = dev ? dev->ifindex : 0;
143 *dreg = (priv->flags & NFTA_FIB_F_PRESENT) ? !!index : index;
144 break;
145 case NFT_FIB_RESULT_OIFNAME:
146 if (priv->flags & NFTA_FIB_F_PRESENT)
147 *dreg = !!dev;
148 else
149 strncpy(reg, dev ? dev->name : "", IFNAMSIZ);
150 break;
151 default:
152 WARN_ON_ONCE(1);
153 *dreg = 0;
154 break;
155 }
156}
157EXPORT_SYMBOL_GPL(nft_fib_store_result);
158
159MODULE_LICENSE("GPL");
160MODULE_AUTHOR("Florian Westphal <fw@strlen.de>");
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 *
4 * Generic part shared by ipv4 and ipv6 backends.
5 */
6
7#include <linux/kernel.h>
8#include <linux/init.h>
9#include <linux/module.h>
10#include <linux/netlink.h>
11#include <linux/netfilter.h>
12#include <linux/netfilter/nf_tables.h>
13#include <net/netfilter/nf_tables_core.h>
14#include <net/netfilter/nf_tables.h>
15#include <net/netfilter/nft_fib.h>
16
17#define NFTA_FIB_F_ALL (NFTA_FIB_F_SADDR | NFTA_FIB_F_DADDR | \
18 NFTA_FIB_F_MARK | NFTA_FIB_F_IIF | NFTA_FIB_F_OIF | \
19 NFTA_FIB_F_PRESENT)
20
21const struct nla_policy nft_fib_policy[NFTA_FIB_MAX + 1] = {
22 [NFTA_FIB_DREG] = { .type = NLA_U32 },
23 [NFTA_FIB_RESULT] = { .type = NLA_U32 },
24 [NFTA_FIB_FLAGS] =
25 NLA_POLICY_MASK(NLA_BE32, NFTA_FIB_F_ALL),
26};
27EXPORT_SYMBOL(nft_fib_policy);
28
29int nft_fib_validate(const struct nft_ctx *ctx, const struct nft_expr *expr)
30{
31 const struct nft_fib *priv = nft_expr_priv(expr);
32 unsigned int hooks;
33
34 switch (priv->result) {
35 case NFT_FIB_RESULT_OIF:
36 case NFT_FIB_RESULT_OIFNAME:
37 hooks = (1 << NF_INET_PRE_ROUTING) |
38 (1 << NF_INET_LOCAL_IN) |
39 (1 << NF_INET_FORWARD);
40 break;
41 case NFT_FIB_RESULT_ADDRTYPE:
42 if (priv->flags & NFTA_FIB_F_IIF)
43 hooks = (1 << NF_INET_PRE_ROUTING) |
44 (1 << NF_INET_LOCAL_IN) |
45 (1 << NF_INET_FORWARD);
46 else if (priv->flags & NFTA_FIB_F_OIF)
47 hooks = (1 << NF_INET_LOCAL_OUT) |
48 (1 << NF_INET_POST_ROUTING) |
49 (1 << NF_INET_FORWARD);
50 else
51 hooks = (1 << NF_INET_LOCAL_IN) |
52 (1 << NF_INET_LOCAL_OUT) |
53 (1 << NF_INET_FORWARD) |
54 (1 << NF_INET_PRE_ROUTING) |
55 (1 << NF_INET_POST_ROUTING);
56
57 break;
58 default:
59 return -EINVAL;
60 }
61
62 return nft_chain_validate_hooks(ctx->chain, hooks);
63}
64EXPORT_SYMBOL_GPL(nft_fib_validate);
65
66int nft_fib_init(const struct nft_ctx *ctx, const struct nft_expr *expr,
67 const struct nlattr * const tb[])
68{
69 struct nft_fib *priv = nft_expr_priv(expr);
70 unsigned int len;
71 int err;
72
73 if (!tb[NFTA_FIB_DREG] || !tb[NFTA_FIB_RESULT] || !tb[NFTA_FIB_FLAGS])
74 return -EINVAL;
75
76 priv->flags = ntohl(nla_get_be32(tb[NFTA_FIB_FLAGS]));
77
78 if (priv->flags == 0)
79 return -EINVAL;
80
81 if ((priv->flags & (NFTA_FIB_F_SADDR | NFTA_FIB_F_DADDR)) ==
82 (NFTA_FIB_F_SADDR | NFTA_FIB_F_DADDR))
83 return -EINVAL;
84 if ((priv->flags & (NFTA_FIB_F_IIF | NFTA_FIB_F_OIF)) ==
85 (NFTA_FIB_F_IIF | NFTA_FIB_F_OIF))
86 return -EINVAL;
87 if ((priv->flags & (NFTA_FIB_F_SADDR | NFTA_FIB_F_DADDR)) == 0)
88 return -EINVAL;
89
90 priv->result = ntohl(nla_get_be32(tb[NFTA_FIB_RESULT]));
91
92 switch (priv->result) {
93 case NFT_FIB_RESULT_OIF:
94 if (priv->flags & NFTA_FIB_F_OIF)
95 return -EINVAL;
96 len = sizeof(int);
97 break;
98 case NFT_FIB_RESULT_OIFNAME:
99 if (priv->flags & NFTA_FIB_F_OIF)
100 return -EINVAL;
101 len = IFNAMSIZ;
102 break;
103 case NFT_FIB_RESULT_ADDRTYPE:
104 len = sizeof(u32);
105 break;
106 default:
107 return -EINVAL;
108 }
109
110 err = nft_parse_register_store(ctx, tb[NFTA_FIB_DREG], &priv->dreg,
111 NULL, NFT_DATA_VALUE, len);
112 if (err < 0)
113 return err;
114
115 return 0;
116}
117EXPORT_SYMBOL_GPL(nft_fib_init);
118
119int nft_fib_dump(struct sk_buff *skb, const struct nft_expr *expr, bool reset)
120{
121 const struct nft_fib *priv = nft_expr_priv(expr);
122
123 if (nft_dump_register(skb, NFTA_FIB_DREG, priv->dreg))
124 return -1;
125
126 if (nla_put_be32(skb, NFTA_FIB_RESULT, htonl(priv->result)))
127 return -1;
128
129 if (nla_put_be32(skb, NFTA_FIB_FLAGS, htonl(priv->flags)))
130 return -1;
131
132 return 0;
133}
134EXPORT_SYMBOL_GPL(nft_fib_dump);
135
136void nft_fib_store_result(void *reg, const struct nft_fib *priv,
137 const struct net_device *dev)
138{
139 u32 *dreg = reg;
140 int index;
141
142 switch (priv->result) {
143 case NFT_FIB_RESULT_OIF:
144 index = dev ? dev->ifindex : 0;
145 if (priv->flags & NFTA_FIB_F_PRESENT)
146 nft_reg_store8(dreg, !!index);
147 else
148 *dreg = index;
149
150 break;
151 case NFT_FIB_RESULT_OIFNAME:
152 if (priv->flags & NFTA_FIB_F_PRESENT)
153 nft_reg_store8(dreg, !!dev);
154 else
155 strscpy_pad(reg, dev ? dev->name : "", IFNAMSIZ);
156 break;
157 default:
158 WARN_ON_ONCE(1);
159 *dreg = 0;
160 break;
161 }
162}
163EXPORT_SYMBOL_GPL(nft_fib_store_result);
164
165bool nft_fib_reduce(struct nft_regs_track *track,
166 const struct nft_expr *expr)
167{
168 const struct nft_fib *priv = nft_expr_priv(expr);
169 unsigned int len = NFT_REG32_SIZE;
170 const struct nft_fib *fib;
171
172 switch (priv->result) {
173 case NFT_FIB_RESULT_OIF:
174 break;
175 case NFT_FIB_RESULT_OIFNAME:
176 if (priv->flags & NFTA_FIB_F_PRESENT)
177 len = NFT_REG32_SIZE;
178 else
179 len = IFNAMSIZ;
180 break;
181 case NFT_FIB_RESULT_ADDRTYPE:
182 break;
183 default:
184 WARN_ON_ONCE(1);
185 break;
186 }
187
188 if (!nft_reg_track_cmp(track, expr, priv->dreg)) {
189 nft_reg_track_update(track, expr, priv->dreg, len);
190 return false;
191 }
192
193 fib = nft_expr_priv(track->regs[priv->dreg].selector);
194 if (priv->result != fib->result ||
195 priv->flags != fib->flags) {
196 nft_reg_track_update(track, expr, priv->dreg, len);
197 return false;
198 }
199
200 if (!track->regs[priv->dreg].bitwise)
201 return true;
202
203 return false;
204}
205EXPORT_SYMBOL_GPL(nft_fib_reduce);
206
207MODULE_LICENSE("GPL");
208MODULE_DESCRIPTION("Query routing table from nftables");
209MODULE_AUTHOR("Florian Westphal <fw@strlen.de>");