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/static_key.h>
20 #include <linux/netfilter/nfnetlink.h>
21 #include <linux/netfilter/nf_tables.h>
22 #include <net/netfilter/nf_tables_core.h>
23 #include <net/netfilter/nf_tables.h>
24 #include <net/netfilter/nf_log.h>
26 static const char *const comments[__NFT_TRACETYPE_MAX] = {
27 [NFT_TRACETYPE_POLICY] = "policy",
28 [NFT_TRACETYPE_RETURN] = "return",
29 [NFT_TRACETYPE_RULE] = "rule",
32 static struct nf_loginfo trace_loginfo = {
33 .type = NF_LOG_TYPE_LOG,
36 .level = LOGLEVEL_WARNING,
37 .logflags = NF_LOG_DEFAULT_MASK,
42 static noinline void __nft_trace_packet(struct nft_traceinfo *info,
43 const struct nft_chain *chain,
44 int rulenum, enum nft_trace_types type)
46 const struct nft_pktinfo *pkt = info->pkt;
48 if (!info->trace || !pkt->skb->nf_trace)
54 nft_trace_notify(info);
56 nf_log_trace(nft_net(pkt), nft_pf(pkt), nft_hook(pkt), pkt->skb,
57 nft_in(pkt), nft_out(pkt), &trace_loginfo,
58 "TRACE: %s:%s:%s:%u ",
59 chain->table->name, chain->name, comments[type], rulenum);
62 static inline void nft_trace_packet(struct nft_traceinfo *info,
63 const struct nft_chain *chain,
64 const struct nft_rule *rule,
66 enum nft_trace_types type)
68 if (static_branch_unlikely(&nft_trace_enabled)) {
70 __nft_trace_packet(info, chain, rulenum, type);
74 static void nft_cmp_fast_eval(const struct nft_expr *expr,
75 struct nft_regs *regs)
77 const struct nft_cmp_fast_expr *priv = nft_expr_priv(expr);
78 u32 mask = nft_cmp_fast_mask(priv->len);
80 if ((regs->data[priv->sreg] & mask) == priv->data)
82 regs->verdict.code = NFT_BREAK;
85 static bool nft_payload_fast_eval(const struct nft_expr *expr,
86 struct nft_regs *regs,
87 const struct nft_pktinfo *pkt)
89 const struct nft_payload *priv = nft_expr_priv(expr);
90 const struct sk_buff *skb = pkt->skb;
91 u32 *dest = ®s->data[priv->dreg];
94 if (priv->base == NFT_PAYLOAD_NETWORK_HEADER)
95 ptr = skb_network_header(skb);
99 ptr = skb_network_header(skb) + pkt->xt.thoff;
104 if (unlikely(ptr + priv->len > skb_tail_pointer(skb)))
109 *(u16 *)dest = *(u16 *)ptr;
110 else if (priv->len == 4)
111 *(u32 *)dest = *(u32 *)ptr;
113 *(u8 *)dest = *(u8 *)ptr;
117 struct nft_jumpstack {
118 const struct nft_chain *chain;
119 const struct nft_rule *rule;
124 nft_do_chain(struct nft_pktinfo *pkt, void *priv)
126 const struct nft_chain *chain = priv, *basechain = chain;
127 const struct net *net = nft_net(pkt);
128 const struct nft_rule *rule;
129 const struct nft_expr *expr, *last;
130 struct nft_regs regs;
131 unsigned int stackptr = 0;
132 struct nft_jumpstack jumpstack[NFT_JUMP_STACK_SIZE];
133 struct nft_stats *stats;
135 unsigned int gencursor = nft_genmask_cur(net);
136 struct nft_traceinfo info;
139 if (static_branch_unlikely(&nft_trace_enabled))
140 nft_trace_init(&info, pkt, ®s.verdict, basechain);
143 rule = list_entry(&chain->rules, struct nft_rule, list);
145 regs.verdict.code = NFT_CONTINUE;
146 list_for_each_entry_continue_rcu(rule, &chain->rules, list) {
148 /* This rule is not active, skip. */
149 if (unlikely(rule->genmask & gencursor))
154 nft_rule_for_each_expr(expr, last, rule) {
155 if (expr->ops == &nft_cmp_fast_ops)
156 nft_cmp_fast_eval(expr, ®s);
157 else if (expr->ops != &nft_payload_fast_ops ||
158 !nft_payload_fast_eval(expr, ®s, pkt))
159 expr->ops->eval(expr, ®s, pkt);
161 if (regs.verdict.code != NFT_CONTINUE)
165 switch (regs.verdict.code) {
167 regs.verdict.code = NFT_CONTINUE;
170 nft_trace_packet(&info, chain, rule,
171 rulenum, NFT_TRACETYPE_RULE);
177 switch (regs.verdict.code & NF_VERDICT_MASK) {
182 nft_trace_packet(&info, chain, rule,
183 rulenum, NFT_TRACETYPE_RULE);
184 return regs.verdict.code;
187 switch (regs.verdict.code) {
189 BUG_ON(stackptr >= NFT_JUMP_STACK_SIZE);
190 jumpstack[stackptr].chain = chain;
191 jumpstack[stackptr].rule = rule;
192 jumpstack[stackptr].rulenum = rulenum;
196 nft_trace_packet(&info, chain, rule,
197 rulenum, NFT_TRACETYPE_RULE);
199 chain = regs.verdict.chain;
205 nft_trace_packet(&info, chain, rule,
206 rulenum, NFT_TRACETYPE_RETURN);
214 chain = jumpstack[stackptr].chain;
215 rule = jumpstack[stackptr].rule;
216 rulenum = jumpstack[stackptr].rulenum;
220 nft_trace_packet(&info, basechain, NULL, -1,
221 NFT_TRACETYPE_POLICY);
224 stats = this_cpu_ptr(rcu_dereference(nft_base_chain(basechain)->stats));
225 u64_stats_update_begin(&stats->syncp);
227 stats->bytes += pkt->skb->len;
228 u64_stats_update_end(&stats->syncp);
229 rcu_read_unlock_bh();
231 return nft_base_chain(basechain)->policy;
233 EXPORT_SYMBOL_GPL(nft_do_chain);
235 static struct nft_expr_type *nft_basic_types[] = {
246 int __init nf_tables_core_module_init(void)
250 for (i = 0; i < ARRAY_SIZE(nft_basic_types); i++) {
251 err = nft_register_expr(nft_basic_types[i]);
260 nft_unregister_expr(nft_basic_types[i]);
264 void nf_tables_core_module_exit(void)
268 i = ARRAY_SIZE(nft_basic_types);
270 nft_unregister_expr(nft_basic_types[i]);