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_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(pkt->net, pkt->pf, pkt->hook, pkt->skb, pkt->in,
57 pkt->out, &trace_loginfo, "TRACE: %s:%s:%s:%u ",
58 chain->table->name, chain->name, comments[type],
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);
97 ptr = skb_network_header(skb) + pkt->xt.thoff;
101 if (unlikely(ptr + priv->len >= skb_tail_pointer(skb)))
106 *(u16 *)dest = *(u16 *)ptr;
107 else if (priv->len == 4)
108 *(u32 *)dest = *(u32 *)ptr;
110 *(u8 *)dest = *(u8 *)ptr;
114 struct nft_jumpstack {
115 const struct nft_chain *chain;
116 const struct nft_rule *rule;
121 nft_do_chain(struct nft_pktinfo *pkt, void *priv)
123 const struct nft_chain *chain = priv, *basechain = chain;
124 const struct net *net = pkt->net;
125 const struct nft_rule *rule;
126 const struct nft_expr *expr, *last;
127 struct nft_regs regs;
128 unsigned int stackptr = 0;
129 struct nft_jumpstack jumpstack[NFT_JUMP_STACK_SIZE];
130 struct nft_stats *stats;
132 unsigned int gencursor = nft_genmask_cur(net);
133 struct nft_traceinfo info;
136 if (static_branch_unlikely(&nft_trace_enabled))
137 nft_trace_init(&info, pkt, ®s.verdict, basechain);
140 rule = list_entry(&chain->rules, struct nft_rule, list);
142 regs.verdict.code = NFT_CONTINUE;
143 list_for_each_entry_continue_rcu(rule, &chain->rules, list) {
145 /* This rule is not active, skip. */
146 if (unlikely(rule->genmask & (1 << gencursor)))
151 nft_rule_for_each_expr(expr, last, rule) {
152 if (expr->ops == &nft_cmp_fast_ops)
153 nft_cmp_fast_eval(expr, ®s);
154 else if (expr->ops != &nft_payload_fast_ops ||
155 !nft_payload_fast_eval(expr, ®s, pkt))
156 expr->ops->eval(expr, ®s, pkt);
158 if (regs.verdict.code != NFT_CONTINUE)
162 switch (regs.verdict.code) {
164 regs.verdict.code = NFT_CONTINUE;
167 nft_trace_packet(&info, chain, rule,
168 rulenum, NFT_TRACETYPE_RULE);
174 switch (regs.verdict.code & NF_VERDICT_MASK) {
178 nft_trace_packet(&info, chain, rule,
179 rulenum, NFT_TRACETYPE_RULE);
180 return regs.verdict.code;
183 switch (regs.verdict.code) {
185 BUG_ON(stackptr >= NFT_JUMP_STACK_SIZE);
186 jumpstack[stackptr].chain = chain;
187 jumpstack[stackptr].rule = rule;
188 jumpstack[stackptr].rulenum = rulenum;
192 nft_trace_packet(&info, chain, rule,
193 rulenum, NFT_TRACETYPE_RULE);
195 chain = regs.verdict.chain;
201 nft_trace_packet(&info, chain, rule,
202 rulenum, NFT_TRACETYPE_RETURN);
210 chain = jumpstack[stackptr].chain;
211 rule = jumpstack[stackptr].rule;
212 rulenum = jumpstack[stackptr].rulenum;
216 nft_trace_packet(&info, basechain, NULL, -1,
217 NFT_TRACETYPE_POLICY);
220 stats = this_cpu_ptr(rcu_dereference(nft_base_chain(basechain)->stats));
221 u64_stats_update_begin(&stats->syncp);
223 stats->bytes += pkt->skb->len;
224 u64_stats_update_end(&stats->syncp);
225 rcu_read_unlock_bh();
227 return nft_base_chain(basechain)->policy;
229 EXPORT_SYMBOL_GPL(nft_do_chain);
231 int __init nf_tables_core_module_init(void)
235 err = nft_immediate_module_init();
239 err = nft_cmp_module_init();
243 err = nft_lookup_module_init();
247 err = nft_bitwise_module_init();
251 err = nft_byteorder_module_init();
255 err = nft_payload_module_init();
259 err = nft_dynset_module_init();
266 nft_payload_module_exit();
268 nft_byteorder_module_exit();
270 nft_bitwise_module_exit();
272 nft_lookup_module_exit();
274 nft_cmp_module_exit();
276 nft_immediate_module_exit();
281 void nf_tables_core_module_exit(void)
283 nft_dynset_module_exit();
284 nft_payload_module_exit();
285 nft_byteorder_module_exit();
286 nft_bitwise_module_exit();
287 nft_lookup_module_exit();
288 nft_cmp_module_exit();
289 nft_immediate_module_exit();