![Florian Westphal](/assets/img/avatar_default.png)
size net/netfilter/nft_meta.ko text data bss dec hex filename 5826 936 1 6763 1a6b net/netfilter/nft_meta.ko 96407 2064 400 98871 18237 net/netfilter/nf_tables.ko after: 100826 2240 401 103467 1942b net/netfilter/nf_tables.ko Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
283 lines
6.6 KiB
C
283 lines
6.6 KiB
C
/*
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* Copyright (c) 2008 Patrick McHardy <kaber@trash.net>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Development of this code funded by Astaro AG (http://www.astaro.com/)
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/list.h>
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#include <linux/rculist.h>
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#include <linux/skbuff.h>
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#include <linux/netlink.h>
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#include <linux/netfilter.h>
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#include <linux/static_key.h>
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#include <linux/netfilter/nfnetlink.h>
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#include <linux/netfilter/nf_tables.h>
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#include <net/netfilter/nf_tables_core.h>
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#include <net/netfilter/nf_tables.h>
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#include <net/netfilter/nf_log.h>
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static const char *const comments[__NFT_TRACETYPE_MAX] = {
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[NFT_TRACETYPE_POLICY] = "policy",
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[NFT_TRACETYPE_RETURN] = "return",
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[NFT_TRACETYPE_RULE] = "rule",
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};
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static const struct nf_loginfo trace_loginfo = {
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.type = NF_LOG_TYPE_LOG,
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.u = {
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.log = {
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.level = LOGLEVEL_WARNING,
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.logflags = NF_LOG_DEFAULT_MASK,
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},
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},
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};
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static noinline void __nft_trace_packet(struct nft_traceinfo *info,
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const struct nft_chain *chain,
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int rulenum, enum nft_trace_types type)
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{
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const struct nft_pktinfo *pkt = info->pkt;
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if (!info->trace || !pkt->skb->nf_trace)
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return;
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info->chain = chain;
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info->type = type;
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nft_trace_notify(info);
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nf_log_trace(nft_net(pkt), nft_pf(pkt), nft_hook(pkt), pkt->skb,
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nft_in(pkt), nft_out(pkt), &trace_loginfo,
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"TRACE: %s:%s:%s:%u ",
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chain->table->name, chain->name, comments[type], rulenum);
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}
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static inline void nft_trace_packet(struct nft_traceinfo *info,
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const struct nft_chain *chain,
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const struct nft_rule *rule,
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int rulenum,
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enum nft_trace_types type)
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{
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if (static_branch_unlikely(&nft_trace_enabled)) {
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info->rule = rule;
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__nft_trace_packet(info, chain, rulenum, type);
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}
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}
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static void nft_cmp_fast_eval(const struct nft_expr *expr,
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struct nft_regs *regs)
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{
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const struct nft_cmp_fast_expr *priv = nft_expr_priv(expr);
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u32 mask = nft_cmp_fast_mask(priv->len);
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if ((regs->data[priv->sreg] & mask) == priv->data)
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return;
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regs->verdict.code = NFT_BREAK;
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}
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static bool nft_payload_fast_eval(const struct nft_expr *expr,
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struct nft_regs *regs,
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const struct nft_pktinfo *pkt)
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{
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const struct nft_payload *priv = nft_expr_priv(expr);
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const struct sk_buff *skb = pkt->skb;
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u32 *dest = ®s->data[priv->dreg];
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unsigned char *ptr;
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if (priv->base == NFT_PAYLOAD_NETWORK_HEADER)
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ptr = skb_network_header(skb);
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else {
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if (!pkt->tprot_set)
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return false;
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ptr = skb_network_header(skb) + pkt->xt.thoff;
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}
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ptr += priv->offset;
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if (unlikely(ptr + priv->len > skb_tail_pointer(skb)))
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return false;
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*dest = 0;
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if (priv->len == 2)
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*(u16 *)dest = *(u16 *)ptr;
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else if (priv->len == 4)
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*(u32 *)dest = *(u32 *)ptr;
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else
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*(u8 *)dest = *(u8 *)ptr;
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return true;
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}
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DEFINE_STATIC_KEY_FALSE(nft_counters_enabled);
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static noinline void nft_update_chain_stats(const struct nft_chain *chain,
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const struct nft_pktinfo *pkt)
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{
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struct nft_stats *stats;
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local_bh_disable();
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stats = this_cpu_ptr(rcu_dereference(nft_base_chain(chain)->stats));
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u64_stats_update_begin(&stats->syncp);
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stats->pkts++;
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stats->bytes += pkt->skb->len;
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u64_stats_update_end(&stats->syncp);
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local_bh_enable();
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}
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struct nft_jumpstack {
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const struct nft_chain *chain;
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const struct nft_rule *rule;
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int rulenum;
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};
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unsigned int
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nft_do_chain(struct nft_pktinfo *pkt, void *priv)
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{
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const struct nft_chain *chain = priv, *basechain = chain;
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const struct net *net = nft_net(pkt);
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const struct nft_rule *rule;
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const struct nft_expr *expr, *last;
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struct nft_regs regs;
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unsigned int stackptr = 0;
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struct nft_jumpstack jumpstack[NFT_JUMP_STACK_SIZE];
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int rulenum;
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unsigned int gencursor = nft_genmask_cur(net);
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struct nft_traceinfo info;
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info.trace = false;
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if (static_branch_unlikely(&nft_trace_enabled))
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nft_trace_init(&info, pkt, ®s.verdict, basechain);
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do_chain:
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rulenum = 0;
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rule = list_entry(&chain->rules, struct nft_rule, list);
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next_rule:
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regs.verdict.code = NFT_CONTINUE;
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list_for_each_entry_continue_rcu(rule, &chain->rules, list) {
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/* This rule is not active, skip. */
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if (unlikely(rule->genmask & gencursor))
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continue;
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rulenum++;
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nft_rule_for_each_expr(expr, last, rule) {
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if (expr->ops == &nft_cmp_fast_ops)
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nft_cmp_fast_eval(expr, ®s);
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else if (expr->ops != &nft_payload_fast_ops ||
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!nft_payload_fast_eval(expr, ®s, pkt))
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expr->ops->eval(expr, ®s, pkt);
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if (regs.verdict.code != NFT_CONTINUE)
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break;
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}
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switch (regs.verdict.code) {
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case NFT_BREAK:
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regs.verdict.code = NFT_CONTINUE;
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continue;
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case NFT_CONTINUE:
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nft_trace_packet(&info, chain, rule,
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rulenum, NFT_TRACETYPE_RULE);
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continue;
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}
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break;
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}
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switch (regs.verdict.code & NF_VERDICT_MASK) {
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case NF_ACCEPT:
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case NF_DROP:
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case NF_QUEUE:
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case NF_STOLEN:
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nft_trace_packet(&info, chain, rule,
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rulenum, NFT_TRACETYPE_RULE);
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return regs.verdict.code;
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}
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switch (regs.verdict.code) {
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case NFT_JUMP:
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BUG_ON(stackptr >= NFT_JUMP_STACK_SIZE);
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jumpstack[stackptr].chain = chain;
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jumpstack[stackptr].rule = rule;
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jumpstack[stackptr].rulenum = rulenum;
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stackptr++;
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/* fall through */
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case NFT_GOTO:
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nft_trace_packet(&info, chain, rule,
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rulenum, NFT_TRACETYPE_RULE);
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chain = regs.verdict.chain;
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goto do_chain;
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case NFT_CONTINUE:
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rulenum++;
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/* fall through */
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case NFT_RETURN:
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nft_trace_packet(&info, chain, rule,
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rulenum, NFT_TRACETYPE_RETURN);
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break;
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default:
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WARN_ON(1);
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}
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if (stackptr > 0) {
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stackptr--;
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chain = jumpstack[stackptr].chain;
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rule = jumpstack[stackptr].rule;
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rulenum = jumpstack[stackptr].rulenum;
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goto next_rule;
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}
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nft_trace_packet(&info, basechain, NULL, -1,
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NFT_TRACETYPE_POLICY);
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if (static_branch_unlikely(&nft_counters_enabled))
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nft_update_chain_stats(basechain, pkt);
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return nft_base_chain(basechain)->policy;
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}
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EXPORT_SYMBOL_GPL(nft_do_chain);
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static struct nft_expr_type *nft_basic_types[] = {
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&nft_imm_type,
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&nft_cmp_type,
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&nft_lookup_type,
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&nft_bitwise_type,
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&nft_byteorder_type,
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&nft_payload_type,
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&nft_dynset_type,
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&nft_range_type,
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&nft_meta_type,
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};
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int __init nf_tables_core_module_init(void)
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{
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int err, i;
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for (i = 0; i < ARRAY_SIZE(nft_basic_types); i++) {
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err = nft_register_expr(nft_basic_types[i]);
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if (err)
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goto err;
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}
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return 0;
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err:
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while (i-- > 0)
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nft_unregister_expr(nft_basic_types[i]);
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return err;
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}
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void nf_tables_core_module_exit(void)
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{
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int i;
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i = ARRAY_SIZE(nft_basic_types);
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while (i-- > 0)
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nft_unregister_expr(nft_basic_types[i]);
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}
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