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96518518 PM |
1 | /* |
2 | * Copyright (c) 2008 Patrick McHardy <kaber@trash.net> | |
3 | * | |
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. | |
7 | * | |
8 | * Development of this code funded by Astaro AG (http://www.astaro.com/) | |
9 | */ | |
10 | ||
a81b2ce8 | 11 | #include <linux/kernel.h> |
96518518 PM |
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> | |
b5bc89bf | 23 | #include <net/netfilter/nf_log.h> |
96518518 | 24 | |
01ef16c2 PM |
25 | enum nft_trace { |
26 | NFT_TRACE_RULE, | |
27 | NFT_TRACE_RETURN, | |
28 | NFT_TRACE_POLICY, | |
29 | }; | |
30 | ||
31 | static const char *const comments[] = { | |
32 | [NFT_TRACE_RULE] = "rule", | |
33 | [NFT_TRACE_RETURN] = "return", | |
34 | [NFT_TRACE_POLICY] = "policy", | |
35 | }; | |
36 | ||
37 | static struct nf_loginfo trace_loginfo = { | |
38 | .type = NF_LOG_TYPE_LOG, | |
39 | .u = { | |
40 | .log = { | |
a81b2ce8 | 41 | .level = LOGLEVEL_WARNING, |
01ef16c2 PM |
42 | .logflags = NF_LOG_MASK, |
43 | }, | |
44 | }, | |
45 | }; | |
46 | ||
47 | static void __nft_trace_packet(const struct nft_pktinfo *pkt, | |
48 | const struct nft_chain *chain, | |
49 | int rulenum, enum nft_trace type) | |
50 | { | |
51 | struct net *net = dev_net(pkt->in ? pkt->in : pkt->out); | |
52 | ||
fce1528e PNA |
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], | |
56 | rulenum); | |
01ef16c2 PM |
57 | } |
58 | ||
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) | |
62 | { | |
63 | if (unlikely(pkt->skb->nf_trace)) | |
64 | __nft_trace_packet(pkt, chain, rulenum, type); | |
65 | } | |
66 | ||
cb7dbfd0 | 67 | static void nft_cmp_fast_eval(const struct nft_expr *expr, |
a55e22e9 | 68 | struct nft_regs *regs) |
cb7dbfd0 PM |
69 | { |
70 | const struct nft_cmp_fast_expr *priv = nft_expr_priv(expr); | |
b855d416 | 71 | u32 mask = nft_cmp_fast_mask(priv->len); |
cb7dbfd0 | 72 | |
49499c3e | 73 | if ((regs->data[priv->sreg] & mask) == priv->data) |
cb7dbfd0 | 74 | return; |
a55e22e9 | 75 | regs->verdict.code = NFT_BREAK; |
cb7dbfd0 PM |
76 | } |
77 | ||
c29b72e0 | 78 | static bool nft_payload_fast_eval(const struct nft_expr *expr, |
a55e22e9 | 79 | struct nft_regs *regs, |
c29b72e0 PM |
80 | const struct nft_pktinfo *pkt) |
81 | { | |
82 | const struct nft_payload *priv = nft_expr_priv(expr); | |
83 | const struct sk_buff *skb = pkt->skb; | |
49499c3e | 84 | u32 *dest = ®s->data[priv->dreg]; |
c29b72e0 PM |
85 | unsigned char *ptr; |
86 | ||
87 | if (priv->base == NFT_PAYLOAD_NETWORK_HEADER) | |
88 | ptr = skb_network_header(skb); | |
89 | else | |
c54032e0 | 90 | ptr = skb_network_header(skb) + pkt->xt.thoff; |
c29b72e0 PM |
91 | |
92 | ptr += priv->offset; | |
93 | ||
94 | if (unlikely(ptr + priv->len >= skb_tail_pointer(skb))) | |
95 | return false; | |
96 | ||
49499c3e | 97 | *dest = 0; |
c29b72e0 | 98 | if (priv->len == 2) |
fad136ea | 99 | *(u16 *)dest = *(u16 *)ptr; |
c29b72e0 | 100 | else if (priv->len == 4) |
fad136ea | 101 | *(u32 *)dest = *(u32 *)ptr; |
c29b72e0 | 102 | else |
fad136ea | 103 | *(u8 *)dest = *(u8 *)ptr; |
c29b72e0 PM |
104 | return true; |
105 | } | |
106 | ||
0ca743a5 PNA |
107 | struct nft_jumpstack { |
108 | const struct nft_chain *chain; | |
109 | const struct nft_rule *rule; | |
b5bc89bf | 110 | int rulenum; |
0ca743a5 PNA |
111 | }; |
112 | ||
0ca743a5 | 113 | unsigned int |
3876d22d | 114 | nft_do_chain(struct nft_pktinfo *pkt, const struct nf_hook_ops *ops) |
96518518 | 115 | { |
5467a512 | 116 | const struct nft_chain *chain = ops->priv, *basechain = chain; |
fdab6a4c | 117 | const struct net *net = dev_net(pkt->in ? pkt->in : pkt->out); |
96518518 PM |
118 | const struct nft_rule *rule; |
119 | const struct nft_expr *expr, *last; | |
a55e22e9 | 120 | struct nft_regs regs; |
96518518 | 121 | unsigned int stackptr = 0; |
0ca743a5 | 122 | struct nft_jumpstack jumpstack[NFT_JUMP_STACK_SIZE]; |
ce355e20 | 123 | struct nft_stats *stats; |
d088be80 | 124 | int rulenum; |
ea4bd995 | 125 | unsigned int gencursor = nft_genmask_cur(net); |
96518518 PM |
126 | |
127 | do_chain: | |
d088be80 | 128 | rulenum = 0; |
96518518 PM |
129 | rule = list_entry(&chain->rules, struct nft_rule, list); |
130 | next_rule: | |
a55e22e9 | 131 | regs.verdict.code = NFT_CONTINUE; |
96518518 | 132 | list_for_each_entry_continue_rcu(rule, &chain->rules, list) { |
0628b123 PNA |
133 | |
134 | /* This rule is not active, skip. */ | |
135 | if (unlikely(rule->genmask & (1 << gencursor))) | |
136 | continue; | |
137 | ||
b5bc89bf PNA |
138 | rulenum++; |
139 | ||
96518518 | 140 | nft_rule_for_each_expr(expr, last, rule) { |
cb7dbfd0 | 141 | if (expr->ops == &nft_cmp_fast_ops) |
a55e22e9 | 142 | nft_cmp_fast_eval(expr, ®s); |
c29b72e0 | 143 | else if (expr->ops != &nft_payload_fast_ops || |
a55e22e9 PM |
144 | !nft_payload_fast_eval(expr, ®s, pkt)) |
145 | expr->ops->eval(expr, ®s, pkt); | |
cb7dbfd0 | 146 | |
a55e22e9 | 147 | if (regs.verdict.code != NFT_CONTINUE) |
96518518 PM |
148 | break; |
149 | } | |
150 | ||
a55e22e9 | 151 | switch (regs.verdict.code) { |
96518518 | 152 | case NFT_BREAK: |
a55e22e9 | 153 | regs.verdict.code = NFT_CONTINUE; |
3b084e99 | 154 | continue; |
96518518 | 155 | case NFT_CONTINUE: |
01ef16c2 | 156 | nft_trace_packet(pkt, chain, rulenum, NFT_TRACE_RULE); |
96518518 PM |
157 | continue; |
158 | } | |
159 | break; | |
160 | } | |
161 | ||
a55e22e9 | 162 | switch (regs.verdict.code & NF_VERDICT_MASK) { |
96518518 PM |
163 | case NF_ACCEPT: |
164 | case NF_DROP: | |
165 | case NF_QUEUE: | |
01ef16c2 | 166 | nft_trace_packet(pkt, chain, rulenum, NFT_TRACE_RULE); |
a55e22e9 | 167 | return regs.verdict.code; |
e569bdab EL |
168 | } |
169 | ||
a55e22e9 | 170 | switch (regs.verdict.code) { |
96518518 PM |
171 | case NFT_JUMP: |
172 | BUG_ON(stackptr >= NFT_JUMP_STACK_SIZE); | |
173 | jumpstack[stackptr].chain = chain; | |
174 | jumpstack[stackptr].rule = rule; | |
b5bc89bf | 175 | jumpstack[stackptr].rulenum = rulenum; |
96518518 | 176 | stackptr++; |
354bf5a0 | 177 | /* fall through */ |
96518518 | 178 | case NFT_GOTO: |
01ef16c2 | 179 | nft_trace_packet(pkt, chain, rulenum, NFT_TRACE_RULE); |
7b9d5ef9 | 180 | |
a55e22e9 | 181 | chain = regs.verdict.chain; |
96518518 | 182 | goto do_chain; |
354bf5a0 PM |
183 | case NFT_CONTINUE: |
184 | rulenum++; | |
185 | /* fall through */ | |
96518518 | 186 | case NFT_RETURN: |
01ef16c2 | 187 | nft_trace_packet(pkt, chain, rulenum, NFT_TRACE_RETURN); |
7e9bc10d | 188 | break; |
96518518 PM |
189 | default: |
190 | WARN_ON(1); | |
191 | } | |
192 | ||
193 | if (stackptr > 0) { | |
194 | stackptr--; | |
195 | chain = jumpstack[stackptr].chain; | |
196 | rule = jumpstack[stackptr].rule; | |
b5bc89bf | 197 | rulenum = jumpstack[stackptr].rulenum; |
96518518 PM |
198 | goto next_rule; |
199 | } | |
200 | ||
01ef16c2 | 201 | nft_trace_packet(pkt, basechain, -1, NFT_TRACE_POLICY); |
5467a512 PNA |
202 | |
203 | rcu_read_lock_bh(); | |
ce355e20 ED |
204 | stats = this_cpu_ptr(rcu_dereference(nft_base_chain(basechain)->stats)); |
205 | u64_stats_update_begin(&stats->syncp); | |
206 | stats->pkts++; | |
207 | stats->bytes += pkt->skb->len; | |
208 | u64_stats_update_end(&stats->syncp); | |
5467a512 | 209 | rcu_read_unlock_bh(); |
b5bc89bf | 210 | |
5467a512 | 211 | return nft_base_chain(basechain)->policy; |
96518518 | 212 | } |
3876d22d | 213 | EXPORT_SYMBOL_GPL(nft_do_chain); |
96518518 PM |
214 | |
215 | int __init nf_tables_core_module_init(void) | |
216 | { | |
217 | int err; | |
218 | ||
219 | err = nft_immediate_module_init(); | |
220 | if (err < 0) | |
221 | goto err1; | |
222 | ||
223 | err = nft_cmp_module_init(); | |
224 | if (err < 0) | |
225 | goto err2; | |
226 | ||
227 | err = nft_lookup_module_init(); | |
228 | if (err < 0) | |
229 | goto err3; | |
230 | ||
231 | err = nft_bitwise_module_init(); | |
232 | if (err < 0) | |
233 | goto err4; | |
234 | ||
235 | err = nft_byteorder_module_init(); | |
236 | if (err < 0) | |
237 | goto err5; | |
238 | ||
239 | err = nft_payload_module_init(); | |
240 | if (err < 0) | |
241 | goto err6; | |
242 | ||
22fe54d5 PM |
243 | err = nft_dynset_module_init(); |
244 | if (err < 0) | |
245 | goto err7; | |
246 | ||
96518518 PM |
247 | return 0; |
248 | ||
22fe54d5 PM |
249 | err7: |
250 | nft_payload_module_exit(); | |
96518518 PM |
251 | err6: |
252 | nft_byteorder_module_exit(); | |
253 | err5: | |
254 | nft_bitwise_module_exit(); | |
255 | err4: | |
256 | nft_lookup_module_exit(); | |
257 | err3: | |
258 | nft_cmp_module_exit(); | |
259 | err2: | |
260 | nft_immediate_module_exit(); | |
261 | err1: | |
262 | return err; | |
263 | } | |
264 | ||
265 | void nf_tables_core_module_exit(void) | |
266 | { | |
22fe54d5 | 267 | nft_dynset_module_exit(); |
96518518 PM |
268 | nft_payload_module_exit(); |
269 | nft_byteorder_module_exit(); | |
270 | nft_bitwise_module_exit(); | |
271 | nft_lookup_module_exit(); | |
272 | nft_cmp_module_exit(); | |
273 | nft_immediate_module_exit(); | |
274 | } |