1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (c) 2008 Patrick McHardy <kaber@trash.net>
5 * Development of this code funded by Astaro AG (http://www.astaro.com/)
8 #include <linux/kernel.h>
9 #include <linux/module.h>
10 #include <linux/init.h>
11 #include <linux/list.h>
12 #include <linux/rculist.h>
13 #include <linux/skbuff.h>
14 #include <linux/netlink.h>
15 #include <linux/netfilter.h>
16 #include <linux/static_key.h>
17 #include <linux/netfilter/nfnetlink.h>
18 #include <linux/netfilter/nf_tables.h>
19 #include <net/netfilter/nf_tables_core.h>
20 #include <net/netfilter/nf_tables.h>
21 #include <net/netfilter/nf_log.h>
22 #include <net/netfilter/nft_meta.h>
24 static noinline
void __nft_trace_packet(struct nft_traceinfo
*info
,
25 const struct nft_chain
*chain
,
26 enum nft_trace_types type
)
28 const struct nft_pktinfo
*pkt
= info
->pkt
;
30 if (!info
->trace
|| !pkt
->skb
->nf_trace
)
36 nft_trace_notify(info
);
39 static inline void nft_trace_packet(struct nft_traceinfo
*info
,
40 const struct nft_chain
*chain
,
41 const struct nft_rule
*rule
,
42 enum nft_trace_types type
)
44 if (static_branch_unlikely(&nft_trace_enabled
)) {
46 __nft_trace_packet(info
, chain
, type
);
50 static void nft_bitwise_fast_eval(const struct nft_expr
*expr
,
51 struct nft_regs
*regs
)
53 const struct nft_bitwise_fast_expr
*priv
= nft_expr_priv(expr
);
54 u32
*src
= ®s
->data
[priv
->sreg
];
55 u32
*dst
= ®s
->data
[priv
->dreg
];
57 *dst
= (*src
& priv
->mask
) ^ priv
->xor;
60 static void nft_cmp_fast_eval(const struct nft_expr
*expr
,
61 struct nft_regs
*regs
)
63 const struct nft_cmp_fast_expr
*priv
= nft_expr_priv(expr
);
65 if (((regs
->data
[priv
->sreg
] & priv
->mask
) == priv
->data
) ^ priv
->inv
)
67 regs
->verdict
.code
= NFT_BREAK
;
70 static bool nft_payload_fast_eval(const struct nft_expr
*expr
,
71 struct nft_regs
*regs
,
72 const struct nft_pktinfo
*pkt
)
74 const struct nft_payload
*priv
= nft_expr_priv(expr
);
75 const struct sk_buff
*skb
= pkt
->skb
;
76 u32
*dest
= ®s
->data
[priv
->dreg
];
79 if (priv
->base
== NFT_PAYLOAD_NETWORK_HEADER
)
80 ptr
= skb_network_header(skb
);
84 ptr
= skb_network_header(skb
) + pkt
->xt
.thoff
;
89 if (unlikely(ptr
+ priv
->len
> skb_tail_pointer(skb
)))
94 *(u16
*)dest
= *(u16
*)ptr
;
95 else if (priv
->len
== 4)
96 *(u32
*)dest
= *(u32
*)ptr
;
98 *(u8
*)dest
= *(u8
*)ptr
;
102 DEFINE_STATIC_KEY_FALSE(nft_counters_enabled
);
104 static noinline
void nft_update_chain_stats(const struct nft_chain
*chain
,
105 const struct nft_pktinfo
*pkt
)
107 struct nft_base_chain
*base_chain
;
108 struct nft_stats __percpu
*pstats
;
109 struct nft_stats
*stats
;
111 base_chain
= nft_base_chain(chain
);
114 pstats
= READ_ONCE(base_chain
->stats
);
117 stats
= this_cpu_ptr(pstats
);
118 u64_stats_update_begin(&stats
->syncp
);
120 stats
->bytes
+= pkt
->skb
->len
;
121 u64_stats_update_end(&stats
->syncp
);
127 struct nft_jumpstack
{
128 const struct nft_chain
*chain
;
129 struct nft_rule
*const *rules
;
132 static void expr_call_ops_eval(const struct nft_expr
*expr
,
133 struct nft_regs
*regs
,
134 struct nft_pktinfo
*pkt
)
136 #ifdef CONFIG_RETPOLINE
137 unsigned long e
= (unsigned long)expr
->ops
->eval
;
139 do { if ((e) == (unsigned long)(fun)) \
140 return fun(expr, regs, pkt); } while (0)
142 X(e
, nft_payload_eval
);
144 X(e
, nft_meta_get_eval
);
145 X(e
, nft_lookup_eval
);
146 X(e
, nft_range_eval
);
147 X(e
, nft_immediate_eval
);
148 X(e
, nft_byteorder_eval
);
149 X(e
, nft_dynset_eval
);
150 X(e
, nft_rt_get_eval
);
151 X(e
, nft_bitwise_eval
);
153 #endif /* CONFIG_RETPOLINE */
154 expr
->ops
->eval(expr
, regs
, pkt
);
158 nft_do_chain(struct nft_pktinfo
*pkt
, void *priv
)
160 const struct nft_chain
*chain
= priv
, *basechain
= chain
;
161 const struct net
*net
= nft_net(pkt
);
162 struct nft_rule
*const *rules
;
163 const struct nft_rule
*rule
;
164 const struct nft_expr
*expr
, *last
;
165 struct nft_regs regs
;
166 unsigned int stackptr
= 0;
167 struct nft_jumpstack jumpstack
[NFT_JUMP_STACK_SIZE
];
168 bool genbit
= READ_ONCE(net
->nft
.gencursor
);
169 struct nft_traceinfo info
;
172 if (static_branch_unlikely(&nft_trace_enabled
))
173 nft_trace_init(&info
, pkt
, ®s
.verdict
, basechain
);
176 rules
= rcu_dereference(chain
->rules_gen_1
);
178 rules
= rcu_dereference(chain
->rules_gen_0
);
182 regs
.verdict
.code
= NFT_CONTINUE
;
183 for (; *rules
; rules
++) {
185 nft_rule_for_each_expr(expr
, last
, rule
) {
186 if (expr
->ops
== &nft_cmp_fast_ops
)
187 nft_cmp_fast_eval(expr
, ®s
);
188 else if (expr
->ops
== &nft_bitwise_fast_ops
)
189 nft_bitwise_fast_eval(expr
, ®s
);
190 else if (expr
->ops
!= &nft_payload_fast_ops
||
191 !nft_payload_fast_eval(expr
, ®s
, pkt
))
192 expr_call_ops_eval(expr
, ®s
, pkt
);
194 if (regs
.verdict
.code
!= NFT_CONTINUE
)
198 switch (regs
.verdict
.code
) {
200 regs
.verdict
.code
= NFT_CONTINUE
;
203 nft_trace_packet(&info
, chain
, rule
,
210 switch (regs
.verdict
.code
& NF_VERDICT_MASK
) {
215 nft_trace_packet(&info
, chain
, rule
,
217 return regs
.verdict
.code
;
220 switch (regs
.verdict
.code
) {
222 if (WARN_ON_ONCE(stackptr
>= NFT_JUMP_STACK_SIZE
))
224 jumpstack
[stackptr
].chain
= chain
;
225 jumpstack
[stackptr
].rules
= rules
+ 1;
229 nft_trace_packet(&info
, chain
, rule
,
232 chain
= regs
.verdict
.chain
;
236 nft_trace_packet(&info
, chain
, rule
,
237 NFT_TRACETYPE_RETURN
);
245 chain
= jumpstack
[stackptr
].chain
;
246 rules
= jumpstack
[stackptr
].rules
;
250 nft_trace_packet(&info
, basechain
, NULL
, NFT_TRACETYPE_POLICY
);
252 if (static_branch_unlikely(&nft_counters_enabled
))
253 nft_update_chain_stats(basechain
, pkt
);
255 return nft_base_chain(basechain
)->policy
;
257 EXPORT_SYMBOL_GPL(nft_do_chain
);
259 static struct nft_expr_type
*nft_basic_types
[] = {
273 static struct nft_object_type
*nft_basic_objects
[] = {
274 #ifdef CONFIG_NETWORK_SECMARK
275 &nft_secmark_obj_type
,
279 int __init
nf_tables_core_module_init(void)
283 for (i
= 0; i
< ARRAY_SIZE(nft_basic_objects
); i
++) {
284 err
= nft_register_obj(nft_basic_objects
[i
]);
289 for (j
= 0; j
< ARRAY_SIZE(nft_basic_types
); j
++) {
290 err
= nft_register_expr(nft_basic_types
[j
]);
299 nft_unregister_expr(nft_basic_types
[j
]);
302 nft_unregister_obj(nft_basic_objects
[i
]);
307 void nf_tables_core_module_exit(void)
311 i
= ARRAY_SIZE(nft_basic_types
);
313 nft_unregister_expr(nft_basic_types
[i
]);
315 i
= ARRAY_SIZE(nft_basic_objects
);
317 nft_unregister_obj(nft_basic_objects
[i
]);