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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
96518518 PM |
2 | /* |
3 | * Copyright (c) 2008 Patrick McHardy <kaber@trash.net> | |
4 | * | |
96518518 PM |
5 | * Development of this code funded by Astaro AG (http://www.astaro.com/) |
6 | */ | |
7 | ||
a81b2ce8 | 8 | #include <linux/kernel.h> |
96518518 PM |
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> | |
e639f7ab | 16 | #include <linux/static_key.h> |
96518518 PM |
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> | |
b5bc89bf | 21 | #include <net/netfilter/nf_log.h> |
30e103fe | 22 | #include <net/netfilter/nft_meta.h> |
96518518 | 23 | |
33d5a7b1 FW |
24 | static noinline void __nft_trace_packet(struct nft_traceinfo *info, |
25 | const struct nft_chain *chain, | |
e65eebec | 26 | enum nft_trace_types type) |
01ef16c2 | 27 | { |
33d5a7b1 FW |
28 | const struct nft_pktinfo *pkt = info->pkt; |
29 | ||
e639f7ab | 30 | if (!info->trace || !pkt->skb->nf_trace) |
33d5a7b1 FW |
31 | return; |
32 | ||
33 | info->chain = chain; | |
34 | info->type = type; | |
35 | ||
36 | nft_trace_notify(info); | |
01ef16c2 PM |
37 | } |
38 | ||
33d5a7b1 | 39 | static inline void nft_trace_packet(struct nft_traceinfo *info, |
01ef16c2 | 40 | const struct nft_chain *chain, |
33d5a7b1 | 41 | const struct nft_rule *rule, |
33d5a7b1 | 42 | enum nft_trace_types type) |
01ef16c2 | 43 | { |
e639f7ab | 44 | if (static_branch_unlikely(&nft_trace_enabled)) { |
33d5a7b1 | 45 | info->rule = rule; |
e65eebec | 46 | __nft_trace_packet(info, chain, type); |
33d5a7b1 | 47 | } |
01ef16c2 PM |
48 | } |
49 | ||
cb7dbfd0 | 50 | static void nft_cmp_fast_eval(const struct nft_expr *expr, |
a55e22e9 | 51 | struct nft_regs *regs) |
cb7dbfd0 PM |
52 | { |
53 | const struct nft_cmp_fast_expr *priv = nft_expr_priv(expr); | |
b855d416 | 54 | u32 mask = nft_cmp_fast_mask(priv->len); |
cb7dbfd0 | 55 | |
49499c3e | 56 | if ((regs->data[priv->sreg] & mask) == priv->data) |
cb7dbfd0 | 57 | return; |
a55e22e9 | 58 | regs->verdict.code = NFT_BREAK; |
cb7dbfd0 PM |
59 | } |
60 | ||
c29b72e0 | 61 | static bool nft_payload_fast_eval(const struct nft_expr *expr, |
a55e22e9 | 62 | struct nft_regs *regs, |
c29b72e0 PM |
63 | const struct nft_pktinfo *pkt) |
64 | { | |
65 | const struct nft_payload *priv = nft_expr_priv(expr); | |
66 | const struct sk_buff *skb = pkt->skb; | |
49499c3e | 67 | u32 *dest = ®s->data[priv->dreg]; |
c29b72e0 PM |
68 | unsigned char *ptr; |
69 | ||
70 | if (priv->base == NFT_PAYLOAD_NETWORK_HEADER) | |
71 | ptr = skb_network_header(skb); | |
a20877b5 LZ |
72 | else { |
73 | if (!pkt->tprot_set) | |
74 | return false; | |
c54032e0 | 75 | ptr = skb_network_header(skb) + pkt->xt.thoff; |
a20877b5 | 76 | } |
c29b72e0 PM |
77 | |
78 | ptr += priv->offset; | |
79 | ||
8dc3c2b8 | 80 | if (unlikely(ptr + priv->len > skb_tail_pointer(skb))) |
c29b72e0 PM |
81 | return false; |
82 | ||
49499c3e | 83 | *dest = 0; |
c29b72e0 | 84 | if (priv->len == 2) |
fad136ea | 85 | *(u16 *)dest = *(u16 *)ptr; |
c29b72e0 | 86 | else if (priv->len == 4) |
fad136ea | 87 | *(u32 *)dest = *(u32 *)ptr; |
c29b72e0 | 88 | else |
fad136ea | 89 | *(u8 *)dest = *(u8 *)ptr; |
c29b72e0 PM |
90 | return true; |
91 | } | |
92 | ||
9f08ea84 PNA |
93 | DEFINE_STATIC_KEY_FALSE(nft_counters_enabled); |
94 | ||
95 | static noinline void nft_update_chain_stats(const struct nft_chain *chain, | |
96 | const struct nft_pktinfo *pkt) | |
97 | { | |
00924094 | 98 | struct nft_base_chain *base_chain; |
a9f5e78c | 99 | struct nft_stats __percpu *pstats; |
9f08ea84 PNA |
100 | struct nft_stats *stats; |
101 | ||
00924094 | 102 | base_chain = nft_base_chain(chain); |
00924094 | 103 | |
a9f5e78c LR |
104 | rcu_read_lock(); |
105 | pstats = READ_ONCE(base_chain->stats); | |
106 | if (pstats) { | |
107 | local_bh_disable(); | |
108 | stats = this_cpu_ptr(pstats); | |
00924094 FW |
109 | u64_stats_update_begin(&stats->syncp); |
110 | stats->pkts++; | |
111 | stats->bytes += pkt->skb->len; | |
112 | u64_stats_update_end(&stats->syncp); | |
a9f5e78c | 113 | local_bh_enable(); |
00924094 | 114 | } |
a9f5e78c | 115 | rcu_read_unlock(); |
9f08ea84 PNA |
116 | } |
117 | ||
0ca743a5 PNA |
118 | struct nft_jumpstack { |
119 | const struct nft_chain *chain; | |
0cbc06b3 | 120 | struct nft_rule *const *rules; |
0ca743a5 PNA |
121 | }; |
122 | ||
222440b4 FW |
123 | static void expr_call_ops_eval(const struct nft_expr *expr, |
124 | struct nft_regs *regs, | |
125 | struct nft_pktinfo *pkt) | |
126 | { | |
10870dd8 | 127 | #ifdef CONFIG_RETPOLINE |
222440b4 | 128 | unsigned long e = (unsigned long)expr->ops->eval; |
10870dd8 FW |
129 | #define X(e, fun) \ |
130 | do { if ((e) == (unsigned long)(fun)) \ | |
131 | return fun(expr, regs, pkt); } while (0) | |
132 | ||
133 | X(e, nft_payload_eval); | |
134 | X(e, nft_cmp_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); | |
143 | #undef X | |
144 | #endif /* CONFIG_RETPOLINE */ | |
145 | expr->ops->eval(expr, regs, pkt); | |
222440b4 FW |
146 | } |
147 | ||
0ca743a5 | 148 | unsigned int |
06198b34 | 149 | nft_do_chain(struct nft_pktinfo *pkt, void *priv) |
96518518 | 150 | { |
06198b34 | 151 | const struct nft_chain *chain = priv, *basechain = chain; |
0e5a1c7e | 152 | const struct net *net = nft_net(pkt); |
0cbc06b3 | 153 | struct nft_rule *const *rules; |
96518518 PM |
154 | const struct nft_rule *rule; |
155 | const struct nft_expr *expr, *last; | |
a55e22e9 | 156 | struct nft_regs regs; |
96518518 | 157 | unsigned int stackptr = 0; |
0ca743a5 | 158 | struct nft_jumpstack jumpstack[NFT_JUMP_STACK_SIZE]; |
0cbc06b3 | 159 | bool genbit = READ_ONCE(net->nft.gencursor); |
33d5a7b1 | 160 | struct nft_traceinfo info; |
96518518 | 161 | |
e639f7ab FW |
162 | info.trace = false; |
163 | if (static_branch_unlikely(&nft_trace_enabled)) | |
164 | nft_trace_init(&info, pkt, ®s.verdict, basechain); | |
96518518 | 165 | do_chain: |
0cbc06b3 FW |
166 | if (genbit) |
167 | rules = rcu_dereference(chain->rules_gen_1); | |
168 | else | |
169 | rules = rcu_dereference(chain->rules_gen_0); | |
170 | ||
96518518 | 171 | next_rule: |
0cbc06b3 | 172 | rule = *rules; |
a55e22e9 | 173 | regs.verdict.code = NFT_CONTINUE; |
0cbc06b3 FW |
174 | for (; *rules ; rules++) { |
175 | rule = *rules; | |
96518518 | 176 | nft_rule_for_each_expr(expr, last, rule) { |
cb7dbfd0 | 177 | if (expr->ops == &nft_cmp_fast_ops) |
a55e22e9 | 178 | nft_cmp_fast_eval(expr, ®s); |
c29b72e0 | 179 | else if (expr->ops != &nft_payload_fast_ops || |
a55e22e9 | 180 | !nft_payload_fast_eval(expr, ®s, pkt)) |
222440b4 | 181 | expr_call_ops_eval(expr, ®s, pkt); |
cb7dbfd0 | 182 | |
a55e22e9 | 183 | if (regs.verdict.code != NFT_CONTINUE) |
96518518 PM |
184 | break; |
185 | } | |
186 | ||
a55e22e9 | 187 | switch (regs.verdict.code) { |
96518518 | 188 | case NFT_BREAK: |
a55e22e9 | 189 | regs.verdict.code = NFT_CONTINUE; |
3b084e99 | 190 | continue; |
96518518 | 191 | case NFT_CONTINUE: |
33d5a7b1 | 192 | nft_trace_packet(&info, chain, rule, |
e65eebec | 193 | NFT_TRACETYPE_RULE); |
96518518 PM |
194 | continue; |
195 | } | |
196 | break; | |
197 | } | |
198 | ||
a55e22e9 | 199 | switch (regs.verdict.code & NF_VERDICT_MASK) { |
96518518 PM |
200 | case NF_ACCEPT: |
201 | case NF_DROP: | |
202 | case NF_QUEUE: | |
5efa0fc6 | 203 | case NF_STOLEN: |
33d5a7b1 | 204 | nft_trace_packet(&info, chain, rule, |
e65eebec | 205 | NFT_TRACETYPE_RULE); |
a55e22e9 | 206 | return regs.verdict.code; |
e569bdab EL |
207 | } |
208 | ||
a55e22e9 | 209 | switch (regs.verdict.code) { |
96518518 | 210 | case NFT_JUMP: |
adc972c5 TY |
211 | if (WARN_ON_ONCE(stackptr >= NFT_JUMP_STACK_SIZE)) |
212 | return NF_DROP; | |
96518518 | 213 | jumpstack[stackptr].chain = chain; |
0cbc06b3 | 214 | jumpstack[stackptr].rules = rules + 1; |
96518518 | 215 | stackptr++; |
354bf5a0 | 216 | /* fall through */ |
96518518 | 217 | case NFT_GOTO: |
33d5a7b1 | 218 | nft_trace_packet(&info, chain, rule, |
e65eebec | 219 | NFT_TRACETYPE_RULE); |
7b9d5ef9 | 220 | |
a55e22e9 | 221 | chain = regs.verdict.chain; |
96518518 | 222 | goto do_chain; |
354bf5a0 | 223 | case NFT_CONTINUE: |
96518518 | 224 | case NFT_RETURN: |
33d5a7b1 | 225 | nft_trace_packet(&info, chain, rule, |
e65eebec | 226 | NFT_TRACETYPE_RETURN); |
7e9bc10d | 227 | break; |
96518518 PM |
228 | default: |
229 | WARN_ON(1); | |
230 | } | |
231 | ||
232 | if (stackptr > 0) { | |
233 | stackptr--; | |
234 | chain = jumpstack[stackptr].chain; | |
0cbc06b3 | 235 | rules = jumpstack[stackptr].rules; |
96518518 PM |
236 | goto next_rule; |
237 | } | |
238 | ||
e65eebec | 239 | nft_trace_packet(&info, basechain, NULL, NFT_TRACETYPE_POLICY); |
5467a512 | 240 | |
9f08ea84 PNA |
241 | if (static_branch_unlikely(&nft_counters_enabled)) |
242 | nft_update_chain_stats(basechain, pkt); | |
b5bc89bf | 243 | |
5467a512 | 244 | return nft_base_chain(basechain)->policy; |
96518518 | 245 | } |
3876d22d | 246 | EXPORT_SYMBOL_GPL(nft_do_chain); |
96518518 | 247 | |
4e24877e LZ |
248 | static struct nft_expr_type *nft_basic_types[] = { |
249 | &nft_imm_type, | |
250 | &nft_cmp_type, | |
251 | &nft_lookup_type, | |
252 | &nft_bitwise_type, | |
253 | &nft_byteorder_type, | |
254 | &nft_payload_type, | |
255 | &nft_dynset_type, | |
256 | &nft_range_type, | |
8a22543c | 257 | &nft_meta_type, |
ae1bc6a9 | 258 | &nft_rt_type, |
d0103158 | 259 | &nft_exthdr_type, |
4e24877e LZ |
260 | }; |
261 | ||
fb961945 CG |
262 | static struct nft_object_type *nft_basic_objects[] = { |
263 | #ifdef CONFIG_NETWORK_SECMARK | |
264 | &nft_secmark_obj_type, | |
265 | #endif | |
266 | }; | |
267 | ||
96518518 PM |
268 | int __init nf_tables_core_module_init(void) |
269 | { | |
fb961945 CG |
270 | int err, i, j = 0; |
271 | ||
272 | for (i = 0; i < ARRAY_SIZE(nft_basic_objects); i++) { | |
273 | err = nft_register_obj(nft_basic_objects[i]); | |
274 | if (err) | |
275 | goto err; | |
276 | } | |
96518518 | 277 | |
fb961945 CG |
278 | for (j = 0; j < ARRAY_SIZE(nft_basic_types); j++) { |
279 | err = nft_register_expr(nft_basic_types[j]); | |
4e24877e LZ |
280 | if (err) |
281 | goto err; | |
282 | } | |
96518518 | 283 | |
0f3cd9b3 | 284 | return 0; |
4e24877e LZ |
285 | |
286 | err: | |
fb961945 CG |
287 | while (j-- > 0) |
288 | nft_unregister_expr(nft_basic_types[j]); | |
289 | ||
4e24877e | 290 | while (i-- > 0) |
fb961945 CG |
291 | nft_unregister_obj(nft_basic_objects[i]); |
292 | ||
96518518 PM |
293 | return err; |
294 | } | |
295 | ||
296 | void nf_tables_core_module_exit(void) | |
297 | { | |
4e24877e LZ |
298 | int i; |
299 | ||
300 | i = ARRAY_SIZE(nft_basic_types); | |
301 | while (i-- > 0) | |
302 | nft_unregister_expr(nft_basic_types[i]); | |
fb961945 CG |
303 | |
304 | i = ARRAY_SIZE(nft_basic_objects); | |
305 | while (i-- > 0) | |
306 | nft_unregister_obj(nft_basic_objects[i]); | |
96518518 | 307 | } |