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_cmp_fast_eval(const struct nft_expr
*expr
,
51 struct nft_regs
*regs
)
53 const struct nft_cmp_fast_expr
*priv
= nft_expr_priv(expr
);
54 u32 mask
= nft_cmp_fast_mask(priv
->len
);
56 if ((regs
->data
[priv
->sreg
] & mask
) == priv
->data
)
58 regs
->verdict
.code
= NFT_BREAK
;
61 static bool nft_payload_fast_eval(const struct nft_expr
*expr
,
62 struct nft_regs
*regs
,
63 const struct nft_pktinfo
*pkt
)
65 const struct nft_payload
*priv
= nft_expr_priv(expr
);
66 const struct sk_buff
*skb
= pkt
->skb
;
67 u32
*dest
= ®s
->data
[priv
->dreg
];
70 if (priv
->base
== NFT_PAYLOAD_NETWORK_HEADER
)
71 ptr
= skb_network_header(skb
);
75 ptr
= skb_network_header(skb
) + pkt
->xt
.thoff
;
80 if (unlikely(ptr
+ priv
->len
> skb_tail_pointer(skb
)))
85 *(u16
*)dest
= *(u16
*)ptr
;
86 else if (priv
->len
== 4)
87 *(u32
*)dest
= *(u32
*)ptr
;
89 *(u8
*)dest
= *(u8
*)ptr
;
93 DEFINE_STATIC_KEY_FALSE(nft_counters_enabled
);
95 static noinline
void nft_update_chain_stats(const struct nft_chain
*chain
,
96 const struct nft_pktinfo
*pkt
)
98 struct nft_base_chain
*base_chain
;
99 struct nft_stats __percpu
*pstats
;
100 struct nft_stats
*stats
;
102 base_chain
= nft_base_chain(chain
);
105 pstats
= READ_ONCE(base_chain
->stats
);
108 stats
= this_cpu_ptr(pstats
);
109 u64_stats_update_begin(&stats
->syncp
);
111 stats
->bytes
+= pkt
->skb
->len
;
112 u64_stats_update_end(&stats
->syncp
);
118 struct nft_jumpstack
{
119 const struct nft_chain
*chain
;
120 struct nft_rule
*const *rules
;
123 static void expr_call_ops_eval(const struct nft_expr
*expr
,
124 struct nft_regs
*regs
,
125 struct nft_pktinfo
*pkt
)
127 #ifdef CONFIG_RETPOLINE
128 unsigned long e
= (unsigned long)expr
->ops
->eval
;
130 do { if ((e) == (unsigned long)(fun)) \
131 return fun(expr, regs, pkt); } while (0)
133 X(e
, nft_payload_eval
);
135 X(e
, nft_meta_get_eval
);
136 X(e
, nft_lookup_eval
);
137 X(e
, nft_range_eval
);
138 X(e
, nft_immediate_eval
);
139 X(e
, nft_byteorder_eval
);
140 X(e
, nft_dynset_eval
);
141 X(e
, nft_rt_get_eval
);
142 X(e
, nft_bitwise_eval
);
144 #endif /* CONFIG_RETPOLINE */
145 expr
->ops
->eval(expr
, regs
, pkt
);
149 nft_do_chain(struct nft_pktinfo
*pkt
, void *priv
)
151 const struct nft_chain
*chain
= priv
, *basechain
= chain
;
152 const struct net
*net
= nft_net(pkt
);
153 struct nft_rule
*const *rules
;
154 const struct nft_rule
*rule
;
155 const struct nft_expr
*expr
, *last
;
156 struct nft_regs regs
;
157 unsigned int stackptr
= 0;
158 struct nft_jumpstack jumpstack
[NFT_JUMP_STACK_SIZE
];
159 bool genbit
= READ_ONCE(net
->nft
.gencursor
);
160 struct nft_traceinfo info
;
163 if (static_branch_unlikely(&nft_trace_enabled
))
164 nft_trace_init(&info
, pkt
, ®s
.verdict
, basechain
);
167 rules
= rcu_dereference(chain
->rules_gen_1
);
169 rules
= rcu_dereference(chain
->rules_gen_0
);
173 regs
.verdict
.code
= NFT_CONTINUE
;
174 for (; *rules
; rules
++) {
176 nft_rule_for_each_expr(expr
, last
, rule
) {
177 if (expr
->ops
== &nft_cmp_fast_ops
)
178 nft_cmp_fast_eval(expr
, ®s
);
179 else if (expr
->ops
!= &nft_payload_fast_ops
||
180 !nft_payload_fast_eval(expr
, ®s
, pkt
))
181 expr_call_ops_eval(expr
, ®s
, pkt
);
183 if (regs
.verdict
.code
!= NFT_CONTINUE
)
187 switch (regs
.verdict
.code
) {
189 regs
.verdict
.code
= NFT_CONTINUE
;
192 nft_trace_packet(&info
, chain
, rule
,
199 switch (regs
.verdict
.code
& NF_VERDICT_MASK
) {
204 nft_trace_packet(&info
, chain
, rule
,
206 return regs
.verdict
.code
;
209 switch (regs
.verdict
.code
) {
211 if (WARN_ON_ONCE(stackptr
>= NFT_JUMP_STACK_SIZE
))
213 jumpstack
[stackptr
].chain
= chain
;
214 jumpstack
[stackptr
].rules
= rules
+ 1;
218 nft_trace_packet(&info
, chain
, rule
,
221 chain
= regs
.verdict
.chain
;
225 nft_trace_packet(&info
, chain
, rule
,
226 NFT_TRACETYPE_RETURN
);
234 chain
= jumpstack
[stackptr
].chain
;
235 rules
= jumpstack
[stackptr
].rules
;
239 nft_trace_packet(&info
, basechain
, NULL
, NFT_TRACETYPE_POLICY
);
241 if (static_branch_unlikely(&nft_counters_enabled
))
242 nft_update_chain_stats(basechain
, pkt
);
244 return nft_base_chain(basechain
)->policy
;
246 EXPORT_SYMBOL_GPL(nft_do_chain
);
248 static struct nft_expr_type
*nft_basic_types
[] = {
262 static struct nft_object_type
*nft_basic_objects
[] = {
263 #ifdef CONFIG_NETWORK_SECMARK
264 &nft_secmark_obj_type
,
268 int __init
nf_tables_core_module_init(void)
272 for (i
= 0; i
< ARRAY_SIZE(nft_basic_objects
); i
++) {
273 err
= nft_register_obj(nft_basic_objects
[i
]);
278 for (j
= 0; j
< ARRAY_SIZE(nft_basic_types
); j
++) {
279 err
= nft_register_expr(nft_basic_types
[j
]);
288 nft_unregister_expr(nft_basic_types
[j
]);
291 nft_unregister_obj(nft_basic_objects
[i
]);
296 void nf_tables_core_module_exit(void)
300 i
= ARRAY_SIZE(nft_basic_types
);
302 nft_unregister_expr(nft_basic_types
[i
]);
304 i
= ARRAY_SIZE(nft_basic_objects
);
306 nft_unregister_obj(nft_basic_objects
[i
]);