1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (c) 2008 Patrick McHardy <kaber@trash.net>
5 * Development of this code funded by Astaro AG (http://www.astaro.com/)
8 #include <linux/kernel.h>
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>
16 #include <linux/static_key.h>
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>
21 #include <net/netfilter/nf_log.h>
22 #include <net/netfilter/nft_meta.h>
24 static noinline void __nft_trace_packet(struct nft_traceinfo *info,
25 const struct nft_chain *chain,
26 enum nft_trace_types type)
28 const struct nft_pktinfo *pkt = info->pkt;
30 if (!info->trace || !pkt->skb->nf_trace)
36 nft_trace_notify(info);
39 static inline void nft_trace_packet(struct nft_traceinfo *info,
40 const struct nft_chain *chain,
41 const struct nft_rule_dp *rule,
42 enum nft_trace_types type)
44 if (static_branch_unlikely(&nft_trace_enabled)) {
46 __nft_trace_packet(info, chain, type);
50 static void nft_bitwise_fast_eval(const struct nft_expr *expr,
51 struct nft_regs *regs)
53 const struct nft_bitwise_fast_expr *priv = nft_expr_priv(expr);
54 u32 *src = ®s->data[priv->sreg];
55 u32 *dst = ®s->data[priv->dreg];
57 *dst = (*src & priv->mask) ^ priv->xor;
60 static void nft_cmp_fast_eval(const struct nft_expr *expr,
61 struct nft_regs *regs)
63 const struct nft_cmp_fast_expr *priv = nft_expr_priv(expr);
65 if (((regs->data[priv->sreg] & priv->mask) == priv->data) ^ priv->inv)
67 regs->verdict.code = NFT_BREAK;
70 static noinline void __nft_trace_verdict(struct nft_traceinfo *info,
71 const struct nft_chain *chain,
72 const struct nft_regs *regs)
74 enum nft_trace_types type;
76 switch (regs->verdict.code) {
79 type = NFT_TRACETYPE_RETURN;
82 type = NFT_TRACETYPE_RULE;
86 __nft_trace_packet(info, chain, type);
89 static inline void nft_trace_verdict(struct nft_traceinfo *info,
90 const struct nft_chain *chain,
91 const struct nft_rule_dp *rule,
92 const struct nft_regs *regs)
94 if (static_branch_unlikely(&nft_trace_enabled)) {
96 __nft_trace_verdict(info, chain, regs);
100 static bool nft_payload_fast_eval(const struct nft_expr *expr,
101 struct nft_regs *regs,
102 const struct nft_pktinfo *pkt)
104 const struct nft_payload *priv = nft_expr_priv(expr);
105 const struct sk_buff *skb = pkt->skb;
106 u32 *dest = ®s->data[priv->dreg];
109 if (priv->base == NFT_PAYLOAD_NETWORK_HEADER)
110 ptr = skb_network_header(skb);
112 if (!(pkt->flags & NFT_PKTINFO_L4PROTO))
114 ptr = skb_network_header(skb) + nft_thoff(pkt);
119 if (unlikely(ptr + priv->len > skb_tail_pointer(skb)))
124 *(u16 *)dest = *(u16 *)ptr;
125 else if (priv->len == 4)
126 *(u32 *)dest = *(u32 *)ptr;
128 *(u8 *)dest = *(u8 *)ptr;
132 DEFINE_STATIC_KEY_FALSE(nft_counters_enabled);
134 static noinline void nft_update_chain_stats(const struct nft_chain *chain,
135 const struct nft_pktinfo *pkt)
137 struct nft_base_chain *base_chain;
138 struct nft_stats __percpu *pstats;
139 struct nft_stats *stats;
141 base_chain = nft_base_chain(chain);
143 pstats = READ_ONCE(base_chain->stats);
146 stats = this_cpu_ptr(pstats);
147 u64_stats_update_begin(&stats->syncp);
149 stats->bytes += pkt->skb->len;
150 u64_stats_update_end(&stats->syncp);
155 struct nft_jumpstack {
156 const struct nft_chain *chain;
157 const struct nft_rule_dp *rule;
158 const struct nft_rule_dp *last_rule;
161 static void expr_call_ops_eval(const struct nft_expr *expr,
162 struct nft_regs *regs,
163 struct nft_pktinfo *pkt)
165 #ifdef CONFIG_RETPOLINE
166 unsigned long e = (unsigned long)expr->ops->eval;
168 do { if ((e) == (unsigned long)(fun)) \
169 return fun(expr, regs, pkt); } while (0)
171 X(e, nft_payload_eval);
173 X(e, nft_counter_eval);
174 X(e, nft_meta_get_eval);
175 X(e, nft_lookup_eval);
176 X(e, nft_range_eval);
177 X(e, nft_immediate_eval);
178 X(e, nft_byteorder_eval);
179 X(e, nft_dynset_eval);
180 X(e, nft_rt_get_eval);
181 X(e, nft_bitwise_eval);
183 #endif /* CONFIG_RETPOLINE */
184 expr->ops->eval(expr, regs, pkt);
187 #define nft_rule_expr_first(rule) (struct nft_expr *)&rule->data[0]
188 #define nft_rule_expr_next(expr) ((void *)expr) + expr->ops->size
189 #define nft_rule_expr_last(rule) (struct nft_expr *)&rule->data[rule->dlen]
190 #define nft_rule_next(rule) (void *)rule + sizeof(*rule) + rule->dlen
192 #define nft_rule_dp_for_each_expr(expr, last, rule) \
193 for ((expr) = nft_rule_expr_first(rule), (last) = nft_rule_expr_last(rule); \
195 (expr) = nft_rule_expr_next(expr))
198 nft_do_chain(struct nft_pktinfo *pkt, void *priv)
200 const struct nft_chain *chain = priv, *basechain = chain;
201 const struct nft_rule_dp *rule, *last_rule;
202 const struct net *net = nft_net(pkt);
203 const struct nft_expr *expr, *last;
204 struct nft_regs regs;
205 unsigned int stackptr = 0;
206 struct nft_jumpstack jumpstack[NFT_JUMP_STACK_SIZE];
207 bool genbit = READ_ONCE(net->nft.gencursor);
208 struct nft_rule_blob *blob;
209 struct nft_traceinfo info;
212 if (static_branch_unlikely(&nft_trace_enabled))
213 nft_trace_init(&info, pkt, ®s.verdict, basechain);
216 blob = rcu_dereference(chain->blob_gen_1);
218 blob = rcu_dereference(chain->blob_gen_0);
220 rule = (struct nft_rule_dp *)blob->data;
221 last_rule = (void *)blob->data + blob->size;
223 regs.verdict.code = NFT_CONTINUE;
224 for (; rule < last_rule; rule = nft_rule_next(rule)) {
225 nft_rule_dp_for_each_expr(expr, last, rule) {
226 if (expr->ops == &nft_cmp_fast_ops)
227 nft_cmp_fast_eval(expr, ®s);
228 else if (expr->ops == &nft_bitwise_fast_ops)
229 nft_bitwise_fast_eval(expr, ®s);
230 else if (expr->ops != &nft_payload_fast_ops ||
231 !nft_payload_fast_eval(expr, ®s, pkt))
232 expr_call_ops_eval(expr, ®s, pkt);
234 if (regs.verdict.code != NFT_CONTINUE)
238 switch (regs.verdict.code) {
240 regs.verdict.code = NFT_CONTINUE;
243 nft_trace_packet(&info, chain, rule,
250 nft_trace_verdict(&info, chain, rule, ®s);
252 switch (regs.verdict.code & NF_VERDICT_MASK) {
257 return regs.verdict.code;
260 switch (regs.verdict.code) {
262 if (WARN_ON_ONCE(stackptr >= NFT_JUMP_STACK_SIZE))
264 jumpstack[stackptr].chain = chain;
265 jumpstack[stackptr].rule = nft_rule_next(rule);
266 jumpstack[stackptr].last_rule = last_rule;
270 chain = regs.verdict.chain;
281 chain = jumpstack[stackptr].chain;
282 rule = jumpstack[stackptr].rule;
283 last_rule = jumpstack[stackptr].last_rule;
287 nft_trace_packet(&info, basechain, NULL, NFT_TRACETYPE_POLICY);
289 if (static_branch_unlikely(&nft_counters_enabled))
290 nft_update_chain_stats(basechain, pkt);
292 return nft_base_chain(basechain)->policy;
294 EXPORT_SYMBOL_GPL(nft_do_chain);
296 static struct nft_expr_type *nft_basic_types[] = {
312 static struct nft_object_type *nft_basic_objects[] = {
313 #ifdef CONFIG_NETWORK_SECMARK
314 &nft_secmark_obj_type,
316 &nft_counter_obj_type,
319 int __init nf_tables_core_module_init(void)
323 nft_counter_init_seqcount();
325 for (i = 0; i < ARRAY_SIZE(nft_basic_objects); i++) {
326 err = nft_register_obj(nft_basic_objects[i]);
331 for (j = 0; j < ARRAY_SIZE(nft_basic_types); j++) {
332 err = nft_register_expr(nft_basic_types[j]);
341 nft_unregister_expr(nft_basic_types[j]);
344 nft_unregister_obj(nft_basic_objects[i]);
349 void nf_tables_core_module_exit(void)
353 i = ARRAY_SIZE(nft_basic_types);
355 nft_unregister_expr(nft_basic_types[i]);
357 i = ARRAY_SIZE(nft_basic_objects);
359 nft_unregister_obj(nft_basic_objects[i]);