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/netfilter/nfnetlink.h>
20 #include <linux/netfilter/nf_tables.h>
21 #include <net/netfilter/nf_tables_core.h>
22 #include <net/netfilter/nf_tables.h>
23 #include <net/netfilter/nf_log.h>
31 static const char *const comments
[] = {
32 [NFT_TRACE_RULE
] = "rule",
33 [NFT_TRACE_RETURN
] = "return",
34 [NFT_TRACE_POLICY
] = "policy",
37 static struct nf_loginfo trace_loginfo
= {
38 .type
= NF_LOG_TYPE_LOG
,
41 .level
= LOGLEVEL_WARNING
,
42 .logflags
= NF_LOG_MASK
,
47 static void __nft_trace_packet(const struct nft_pktinfo
*pkt
,
48 const struct nft_chain
*chain
,
49 int rulenum
, enum nft_trace type
)
51 struct net
*net
= dev_net(pkt
->in
? pkt
->in
: pkt
->out
);
53 nf_log_trace(net
, pkt
->xt
.family
, pkt
->ops
->hooknum
, pkt
->skb
, pkt
->in
,
54 pkt
->out
, &trace_loginfo
, "TRACE: %s:%s:%s:%u ",
55 chain
->table
->name
, chain
->name
, comments
[type
],
59 static inline void nft_trace_packet(const struct nft_pktinfo
*pkt
,
60 const struct nft_chain
*chain
,
61 int rulenum
, enum nft_trace type
)
63 if (unlikely(pkt
->skb
->nf_trace
))
64 __nft_trace_packet(pkt
, chain
, rulenum
, type
);
67 static void nft_cmp_fast_eval(const struct nft_expr
*expr
,
68 struct nft_regs
*regs
)
70 const struct nft_cmp_fast_expr
*priv
= nft_expr_priv(expr
);
71 u32 mask
= nft_cmp_fast_mask(priv
->len
);
73 if ((regs
->data
[priv
->sreg
] & mask
) == priv
->data
)
75 regs
->verdict
.code
= NFT_BREAK
;
78 static bool nft_payload_fast_eval(const struct nft_expr
*expr
,
79 struct nft_regs
*regs
,
80 const struct nft_pktinfo
*pkt
)
82 const struct nft_payload
*priv
= nft_expr_priv(expr
);
83 const struct sk_buff
*skb
= pkt
->skb
;
84 u32
*dest
= ®s
->data
[priv
->dreg
];
87 if (priv
->base
== NFT_PAYLOAD_NETWORK_HEADER
)
88 ptr
= skb_network_header(skb
);
90 ptr
= skb_network_header(skb
) + pkt
->xt
.thoff
;
94 if (unlikely(ptr
+ priv
->len
>= skb_tail_pointer(skb
)))
99 *(u16
*)dest
= *(u16
*)ptr
;
100 else if (priv
->len
== 4)
101 *(u32
*)dest
= *(u32
*)ptr
;
103 *(u8
*)dest
= *(u8
*)ptr
;
107 struct nft_jumpstack
{
108 const struct nft_chain
*chain
;
109 const struct nft_rule
*rule
;
114 nft_do_chain(struct nft_pktinfo
*pkt
, const struct nf_hook_ops
*ops
)
116 const struct nft_chain
*chain
= ops
->priv
, *basechain
= chain
;
117 const struct net
*chain_net
= read_pnet(&nft_base_chain(basechain
)->pnet
);
118 const struct net
*net
= dev_net(pkt
->in
? pkt
->in
: pkt
->out
);
119 const struct nft_rule
*rule
;
120 const struct nft_expr
*expr
, *last
;
121 struct nft_regs regs
;
122 unsigned int stackptr
= 0;
123 struct nft_jumpstack jumpstack
[NFT_JUMP_STACK_SIZE
];
124 struct nft_stats
*stats
;
126 unsigned int gencursor
= nft_genmask_cur(net
);
128 /* Ignore chains that are not for the current network namespace */
129 if (!net_eq(net
, chain_net
))
134 rule
= list_entry(&chain
->rules
, struct nft_rule
, list
);
136 regs
.verdict
.code
= NFT_CONTINUE
;
137 list_for_each_entry_continue_rcu(rule
, &chain
->rules
, list
) {
139 /* This rule is not active, skip. */
140 if (unlikely(rule
->genmask
& (1 << gencursor
)))
145 nft_rule_for_each_expr(expr
, last
, rule
) {
146 if (expr
->ops
== &nft_cmp_fast_ops
)
147 nft_cmp_fast_eval(expr
, ®s
);
148 else if (expr
->ops
!= &nft_payload_fast_ops
||
149 !nft_payload_fast_eval(expr
, ®s
, pkt
))
150 expr
->ops
->eval(expr
, ®s
, pkt
);
152 if (regs
.verdict
.code
!= NFT_CONTINUE
)
156 switch (regs
.verdict
.code
) {
158 regs
.verdict
.code
= NFT_CONTINUE
;
161 nft_trace_packet(pkt
, chain
, rulenum
, NFT_TRACE_RULE
);
167 switch (regs
.verdict
.code
& NF_VERDICT_MASK
) {
171 nft_trace_packet(pkt
, chain
, rulenum
, NFT_TRACE_RULE
);
172 return regs
.verdict
.code
;
175 switch (regs
.verdict
.code
) {
177 BUG_ON(stackptr
>= NFT_JUMP_STACK_SIZE
);
178 jumpstack
[stackptr
].chain
= chain
;
179 jumpstack
[stackptr
].rule
= rule
;
180 jumpstack
[stackptr
].rulenum
= rulenum
;
184 nft_trace_packet(pkt
, chain
, rulenum
, NFT_TRACE_RULE
);
186 chain
= regs
.verdict
.chain
;
192 nft_trace_packet(pkt
, chain
, rulenum
, NFT_TRACE_RETURN
);
200 chain
= jumpstack
[stackptr
].chain
;
201 rule
= jumpstack
[stackptr
].rule
;
202 rulenum
= jumpstack
[stackptr
].rulenum
;
206 nft_trace_packet(pkt
, basechain
, -1, NFT_TRACE_POLICY
);
209 stats
= this_cpu_ptr(rcu_dereference(nft_base_chain(basechain
)->stats
));
210 u64_stats_update_begin(&stats
->syncp
);
212 stats
->bytes
+= pkt
->skb
->len
;
213 u64_stats_update_end(&stats
->syncp
);
214 rcu_read_unlock_bh();
216 return nft_base_chain(basechain
)->policy
;
218 EXPORT_SYMBOL_GPL(nft_do_chain
);
220 int __init
nf_tables_core_module_init(void)
224 err
= nft_immediate_module_init();
228 err
= nft_cmp_module_init();
232 err
= nft_lookup_module_init();
236 err
= nft_bitwise_module_init();
240 err
= nft_byteorder_module_init();
244 err
= nft_payload_module_init();
248 err
= nft_dynset_module_init();
255 nft_payload_module_exit();
257 nft_byteorder_module_exit();
259 nft_bitwise_module_exit();
261 nft_lookup_module_exit();
263 nft_cmp_module_exit();
265 nft_immediate_module_exit();
270 void nf_tables_core_module_exit(void)
272 nft_dynset_module_exit();
273 nft_payload_module_exit();
274 nft_byteorder_module_exit();
275 nft_bitwise_module_exit();
276 nft_lookup_module_exit();
277 nft_cmp_module_exit();
278 nft_immediate_module_exit();