2 * Copyright (c) 2008 Patrick McHardy <kaber@trash.net>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
8 * Development of this code funded by Astaro AG (http://www.astaro.com/)
11 #include <linux/kernel.h>
12 #include <linux/module.h>
13 #include <linux/init.h>
14 #include <linux/list.h>
15 #include <linux/rculist.h>
16 #include <linux/skbuff.h>
17 #include <linux/netlink.h>
18 #include <linux/netfilter.h>
19 #include <linux/static_key.h>
20 #include <linux/netfilter/nfnetlink.h>
21 #include <linux/netfilter/nf_tables.h>
22 #include <net/netfilter/nf_tables_core.h>
23 #include <net/netfilter/nf_tables.h>
24 #include <net/netfilter/nf_log.h>
26 static noinline
void __nft_trace_packet(struct nft_traceinfo
*info
,
27 const struct nft_chain
*chain
,
28 enum nft_trace_types type
)
30 const struct nft_pktinfo
*pkt
= info
->pkt
;
32 if (!info
->trace
|| !pkt
->skb
->nf_trace
)
38 nft_trace_notify(info
);
41 static inline void nft_trace_packet(struct nft_traceinfo
*info
,
42 const struct nft_chain
*chain
,
43 const struct nft_rule
*rule
,
44 enum nft_trace_types type
)
46 if (static_branch_unlikely(&nft_trace_enabled
)) {
48 __nft_trace_packet(info
, chain
, type
);
52 static void nft_cmp_fast_eval(const struct nft_expr
*expr
,
53 struct nft_regs
*regs
)
55 const struct nft_cmp_fast_expr
*priv
= nft_expr_priv(expr
);
56 u32 mask
= nft_cmp_fast_mask(priv
->len
);
58 if ((regs
->data
[priv
->sreg
] & mask
) == priv
->data
)
60 regs
->verdict
.code
= NFT_BREAK
;
63 static bool nft_payload_fast_eval(const struct nft_expr
*expr
,
64 struct nft_regs
*regs
,
65 const struct nft_pktinfo
*pkt
)
67 const struct nft_payload
*priv
= nft_expr_priv(expr
);
68 const struct sk_buff
*skb
= pkt
->skb
;
69 u32
*dest
= ®s
->data
[priv
->dreg
];
72 if (priv
->base
== NFT_PAYLOAD_NETWORK_HEADER
)
73 ptr
= skb_network_header(skb
);
77 ptr
= skb_network_header(skb
) + pkt
->xt
.thoff
;
82 if (unlikely(ptr
+ priv
->len
> skb_tail_pointer(skb
)))
87 *(u16
*)dest
= *(u16
*)ptr
;
88 else if (priv
->len
== 4)
89 *(u32
*)dest
= *(u32
*)ptr
;
91 *(u8
*)dest
= *(u8
*)ptr
;
95 DEFINE_STATIC_KEY_FALSE(nft_counters_enabled
);
97 static noinline
void nft_update_chain_stats(const struct nft_chain
*chain
,
98 const struct nft_pktinfo
*pkt
)
100 struct nft_base_chain
*base_chain
;
101 struct nft_stats __percpu
*pstats
;
102 struct nft_stats
*stats
;
104 base_chain
= nft_base_chain(chain
);
107 pstats
= READ_ONCE(base_chain
->stats
);
110 stats
= this_cpu_ptr(pstats
);
111 u64_stats_update_begin(&stats
->syncp
);
113 stats
->bytes
+= pkt
->skb
->len
;
114 u64_stats_update_end(&stats
->syncp
);
120 struct nft_jumpstack
{
121 const struct nft_chain
*chain
;
122 struct nft_rule
*const *rules
;
125 static void expr_call_ops_eval(const struct nft_expr
*expr
,
126 struct nft_regs
*regs
,
127 struct nft_pktinfo
*pkt
)
129 #ifdef CONFIG_RETPOLINE
130 unsigned long e
= (unsigned long)expr
->ops
->eval
;
132 do { if ((e) == (unsigned long)(fun)) \
133 return fun(expr, regs, pkt); } while (0)
135 X(e
, nft_payload_eval
);
137 X(e
, nft_meta_get_eval
);
138 X(e
, nft_lookup_eval
);
139 X(e
, nft_range_eval
);
140 X(e
, nft_immediate_eval
);
141 X(e
, nft_byteorder_eval
);
142 X(e
, nft_dynset_eval
);
143 X(e
, nft_rt_get_eval
);
144 X(e
, nft_bitwise_eval
);
146 #endif /* CONFIG_RETPOLINE */
147 expr
->ops
->eval(expr
, regs
, pkt
);
151 nft_do_chain(struct nft_pktinfo
*pkt
, void *priv
)
153 const struct nft_chain
*chain
= priv
, *basechain
= chain
;
154 const struct net
*net
= nft_net(pkt
);
155 struct nft_rule
*const *rules
;
156 const struct nft_rule
*rule
;
157 const struct nft_expr
*expr
, *last
;
158 struct nft_regs regs
;
159 unsigned int stackptr
= 0;
160 struct nft_jumpstack jumpstack
[NFT_JUMP_STACK_SIZE
];
161 bool genbit
= READ_ONCE(net
->nft
.gencursor
);
162 struct nft_traceinfo info
;
165 if (static_branch_unlikely(&nft_trace_enabled
))
166 nft_trace_init(&info
, pkt
, ®s
.verdict
, basechain
);
169 rules
= rcu_dereference(chain
->rules_gen_1
);
171 rules
= rcu_dereference(chain
->rules_gen_0
);
175 regs
.verdict
.code
= NFT_CONTINUE
;
176 for (; *rules
; rules
++) {
178 nft_rule_for_each_expr(expr
, last
, rule
) {
179 if (expr
->ops
== &nft_cmp_fast_ops
)
180 nft_cmp_fast_eval(expr
, ®s
);
181 else if (expr
->ops
!= &nft_payload_fast_ops
||
182 !nft_payload_fast_eval(expr
, ®s
, pkt
))
183 expr_call_ops_eval(expr
, ®s
, pkt
);
185 if (regs
.verdict
.code
!= NFT_CONTINUE
)
189 switch (regs
.verdict
.code
) {
191 regs
.verdict
.code
= NFT_CONTINUE
;
194 nft_trace_packet(&info
, chain
, rule
,
201 switch (regs
.verdict
.code
& NF_VERDICT_MASK
) {
206 nft_trace_packet(&info
, chain
, rule
,
208 return regs
.verdict
.code
;
211 switch (regs
.verdict
.code
) {
213 if (WARN_ON_ONCE(stackptr
>= NFT_JUMP_STACK_SIZE
))
215 jumpstack
[stackptr
].chain
= chain
;
216 jumpstack
[stackptr
].rules
= rules
+ 1;
220 nft_trace_packet(&info
, chain
, rule
,
223 chain
= regs
.verdict
.chain
;
227 nft_trace_packet(&info
, chain
, rule
,
228 NFT_TRACETYPE_RETURN
);
236 chain
= jumpstack
[stackptr
].chain
;
237 rules
= jumpstack
[stackptr
].rules
;
241 nft_trace_packet(&info
, basechain
, NULL
, NFT_TRACETYPE_POLICY
);
243 if (static_branch_unlikely(&nft_counters_enabled
))
244 nft_update_chain_stats(basechain
, pkt
);
246 return nft_base_chain(basechain
)->policy
;
248 EXPORT_SYMBOL_GPL(nft_do_chain
);
250 static struct nft_expr_type
*nft_basic_types
[] = {
264 static struct nft_object_type
*nft_basic_objects
[] = {
265 #ifdef CONFIG_NETWORK_SECMARK
266 &nft_secmark_obj_type
,
270 int __init
nf_tables_core_module_init(void)
274 for (i
= 0; i
< ARRAY_SIZE(nft_basic_objects
); i
++) {
275 err
= nft_register_obj(nft_basic_objects
[i
]);
280 for (j
= 0; j
< ARRAY_SIZE(nft_basic_types
); j
++) {
281 err
= nft_register_expr(nft_basic_types
[j
]);
290 nft_unregister_expr(nft_basic_types
[j
]);
293 nft_unregister_obj(nft_basic_objects
[i
]);
298 void nf_tables_core_module_exit(void)
302 i
= ARRAY_SIZE(nft_basic_types
);
304 nft_unregister_expr(nft_basic_types
[i
]);
306 i
= ARRAY_SIZE(nft_basic_objects
);
308 nft_unregister_obj(nft_basic_objects
[i
]);