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/module.h>
12 #include <linux/init.h>
13 #include <linux/list.h>
14 #include <linux/rculist.h>
15 #include <linux/skbuff.h>
16 #include <linux/netlink.h>
17 #include <linux/netfilter.h>
18 #include <linux/netfilter/nfnetlink.h>
19 #include <linux/netfilter/nf_tables.h>
20 #include <net/netfilter/nf_tables_core.h>
21 #include <net/netfilter/nf_tables.h>
22 #include <net/netfilter/nf_log.h>
24 static void nft_cmp_fast_eval(const struct nft_expr
*expr
,
25 struct nft_data data
[NFT_REG_MAX
+ 1])
27 const struct nft_cmp_fast_expr
*priv
= nft_expr_priv(expr
);
28 u32 mask
= nft_cmp_fast_mask(priv
->len
);
30 if ((data
[priv
->sreg
].data
[0] & mask
) == priv
->data
)
32 data
[NFT_REG_VERDICT
].verdict
= NFT_BREAK
;
35 static bool nft_payload_fast_eval(const struct nft_expr
*expr
,
36 struct nft_data data
[NFT_REG_MAX
+ 1],
37 const struct nft_pktinfo
*pkt
)
39 const struct nft_payload
*priv
= nft_expr_priv(expr
);
40 const struct sk_buff
*skb
= pkt
->skb
;
41 struct nft_data
*dest
= &data
[priv
->dreg
];
44 if (priv
->base
== NFT_PAYLOAD_NETWORK_HEADER
)
45 ptr
= skb_network_header(skb
);
47 ptr
= skb_network_header(skb
) + pkt
->xt
.thoff
;
51 if (unlikely(ptr
+ priv
->len
>= skb_tail_pointer(skb
)))
55 *(u16
*)dest
->data
= *(u16
*)ptr
;
56 else if (priv
->len
== 4)
57 *(u32
*)dest
->data
= *(u32
*)ptr
;
59 *(u8
*)dest
->data
= *(u8
*)ptr
;
63 struct nft_jumpstack
{
64 const struct nft_chain
*chain
;
65 const struct nft_rule
*rule
;
75 static const char *const comments
[] = {
76 [NFT_TRACE_RULE
] = "rule",
77 [NFT_TRACE_RETURN
] = "return",
78 [NFT_TRACE_POLICY
] = "policy",
81 static struct nf_loginfo trace_loginfo
= {
82 .type
= NF_LOG_TYPE_LOG
,
86 .logflags
= NF_LOG_MASK
,
91 static void nft_trace_packet(const struct nft_pktinfo
*pkt
,
92 const struct nft_chain
*chain
,
93 int rulenum
, enum nft_trace type
)
95 struct net
*net
= dev_net(pkt
->in
? pkt
->in
: pkt
->out
);
97 nf_log_packet(net
, pkt
->xt
.family
, pkt
->ops
->hooknum
, pkt
->skb
, pkt
->in
,
98 pkt
->out
, &trace_loginfo
, "TRACE: %s:%s:%s:%u ",
99 chain
->table
->name
, chain
->name
, comments
[type
],
104 nft_do_chain(struct nft_pktinfo
*pkt
, const struct nf_hook_ops
*ops
)
106 const struct nft_chain
*chain
= ops
->priv
, *basechain
= chain
;
107 const struct nft_rule
*rule
;
108 const struct nft_expr
*expr
, *last
;
109 struct nft_data data
[NFT_REG_MAX
+ 1];
110 unsigned int stackptr
= 0;
111 struct nft_jumpstack jumpstack
[NFT_JUMP_STACK_SIZE
];
112 struct nft_stats
*stats
;
115 * Cache cursor to avoid problems in case that the cursor is updated
116 * while traversing the ruleset.
118 unsigned int gencursor
= ACCESS_ONCE(chain
->net
->nft
.gencursor
);
122 rule
= list_entry(&chain
->rules
, struct nft_rule
, list
);
124 data
[NFT_REG_VERDICT
].verdict
= NFT_CONTINUE
;
125 list_for_each_entry_continue_rcu(rule
, &chain
->rules
, list
) {
127 /* This rule is not active, skip. */
128 if (unlikely(rule
->genmask
& (1 << gencursor
)))
133 nft_rule_for_each_expr(expr
, last
, rule
) {
134 if (expr
->ops
== &nft_cmp_fast_ops
)
135 nft_cmp_fast_eval(expr
, data
);
136 else if (expr
->ops
!= &nft_payload_fast_ops
||
137 !nft_payload_fast_eval(expr
, data
, pkt
))
138 expr
->ops
->eval(expr
, data
, pkt
);
140 if (data
[NFT_REG_VERDICT
].verdict
!= NFT_CONTINUE
)
144 switch (data
[NFT_REG_VERDICT
].verdict
) {
146 data
[NFT_REG_VERDICT
].verdict
= NFT_CONTINUE
;
149 if (unlikely(pkt
->skb
->nf_trace
))
150 nft_trace_packet(pkt
, chain
, rulenum
, NFT_TRACE_RULE
);
156 switch (data
[NFT_REG_VERDICT
].verdict
& NF_VERDICT_MASK
) {
160 if (unlikely(pkt
->skb
->nf_trace
))
161 nft_trace_packet(pkt
, chain
, rulenum
, NFT_TRACE_RULE
);
163 return data
[NFT_REG_VERDICT
].verdict
;
166 switch (data
[NFT_REG_VERDICT
].verdict
) {
168 if (unlikely(pkt
->skb
->nf_trace
))
169 nft_trace_packet(pkt
, chain
, rulenum
, NFT_TRACE_RULE
);
171 BUG_ON(stackptr
>= NFT_JUMP_STACK_SIZE
);
172 jumpstack
[stackptr
].chain
= chain
;
173 jumpstack
[stackptr
].rule
= rule
;
174 jumpstack
[stackptr
].rulenum
= rulenum
;
176 chain
= data
[NFT_REG_VERDICT
].chain
;
179 if (unlikely(pkt
->skb
->nf_trace
))
180 nft_trace_packet(pkt
, chain
, rulenum
, NFT_TRACE_RULE
);
182 chain
= data
[NFT_REG_VERDICT
].chain
;
185 if (unlikely(pkt
->skb
->nf_trace
))
186 nft_trace_packet(pkt
, chain
, rulenum
, NFT_TRACE_RETURN
);
189 if (unlikely(pkt
->skb
->nf_trace
&& !(chain
->flags
& NFT_BASE_CHAIN
)))
190 nft_trace_packet(pkt
, chain
, ++rulenum
, NFT_TRACE_RETURN
);
198 chain
= jumpstack
[stackptr
].chain
;
199 rule
= jumpstack
[stackptr
].rule
;
200 rulenum
= jumpstack
[stackptr
].rulenum
;
204 if (unlikely(pkt
->skb
->nf_trace
))
205 nft_trace_packet(pkt
, basechain
, -1, NFT_TRACE_POLICY
);
208 stats
= this_cpu_ptr(rcu_dereference(nft_base_chain(basechain
)->stats
));
209 u64_stats_update_begin(&stats
->syncp
);
211 stats
->bytes
+= pkt
->skb
->len
;
212 u64_stats_update_end(&stats
->syncp
);
213 rcu_read_unlock_bh();
215 return nft_base_chain(basechain
)->policy
;
217 EXPORT_SYMBOL_GPL(nft_do_chain
);
219 int __init
nf_tables_core_module_init(void)
223 err
= nft_immediate_module_init();
227 err
= nft_cmp_module_init();
231 err
= nft_lookup_module_init();
235 err
= nft_bitwise_module_init();
239 err
= nft_byteorder_module_init();
243 err
= nft_payload_module_init();
250 nft_byteorder_module_exit();
252 nft_bitwise_module_exit();
254 nft_lookup_module_exit();
256 nft_cmp_module_exit();
258 nft_immediate_module_exit();
263 void nf_tables_core_module_exit(void)
265 nft_payload_module_exit();
266 nft_byteorder_module_exit();
267 nft_bitwise_module_exit();
268 nft_lookup_module_exit();
269 nft_cmp_module_exit();
270 nft_immediate_module_exit();