Release 4.15 net/netfilter/nf_tables_core.c

Directory: net/netfilter
/*
 * Copyright (c) 2008 Patrick McHardy <kaber@trash.net>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * Development of this code funded by Astaro AG (http://www.astaro.com/)
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/list.h>
#include <linux/rculist.h>
#include <linux/skbuff.h>
#include <linux/netlink.h>
#include <linux/netfilter.h>
#include <linux/static_key.h>
#include <linux/netfilter/nfnetlink.h>
#include <linux/netfilter/nf_tables.h>
#include <net/netfilter/nf_tables_core.h>
#include <net/netfilter/nf_tables.h>
#include <net/netfilter/nf_log.h>


static const char *const comments[__NFT_TRACETYPE_MAX] = {
	[NFT_TRACETYPE_POLICY]	= "policy",
	[NFT_TRACETYPE_RETURN]	= "return",
	[NFT_TRACETYPE_RULE]	= "rule",
};


static const struct nf_loginfo trace_loginfo = {
	.type = NF_LOG_TYPE_LOG,
	.u = {
		.log = {
			.level = LOGLEVEL_WARNING,
			.logflags = NF_LOG_DEFAULT_MASK,
                },
        },
};



static noinline void __nft_trace_packet(struct nft_traceinfo *info,
					const struct nft_chain *chain,
					int rulenum, enum nft_trace_types type)
{
	const struct nft_pktinfo *pkt = info->pkt;

	if (!info->trace || !pkt->skb->nf_trace)
		return;

	info->chain = chain;
	info->type = type;

	nft_trace_notify(info);

	nf_log_trace(nft_net(pkt), nft_pf(pkt), nft_hook(pkt), pkt->skb,
		     nft_in(pkt), nft_out(pkt), &trace_loginfo,
		     "TRACE: %s:%s:%s:%u ",
		     chain->table->name, chain->name, comments[type], rulenum);
}

Contributors
Person Tokens Prop Commits CommitProp
Patrick McHardy 59 48.76% 1 16.67%
Florian Westphal 46 38.02% 3 50.00%
Pablo Neira Ayuso 15 12.40% 1 16.67%
Eric W. Biedermann 1 0.83% 1 16.67%
Total 121 100.00% 6 100.00%



static inline void nft_trace_packet(struct nft_traceinfo *info,
				    const struct nft_chain *chain,
				    const struct nft_rule *rule,
				    int rulenum,
				    enum nft_trace_types type)
{
	if (static_branch_unlikely(&nft_trace_enabled)) {
		info->rule = rule;
		__nft_trace_packet(info, chain, rulenum, type);
	}
}

Contributors
Person Tokens Prop Commits CommitProp
Patrick McHardy 37 63.79% 1 33.33%
Florian Westphal 21 36.21% 2 66.67%
Total 58 100.00% 3 100.00%



static void nft_cmp_fast_eval(const struct nft_expr *expr,
			      struct nft_regs *regs)
{
	const struct nft_cmp_fast_expr *priv = nft_expr_priv(expr);
	u32 mask = nft_cmp_fast_mask(priv->len);

	if ((regs->data[priv->sreg] & mask) == priv->data)
		return;
	regs->verdict.code = NFT_BREAK;
}

Contributors
Person Tokens Prop Commits CommitProp
Patrick McHardy 66 100.00% 3 100.00%
Total 66 100.00% 3 100.00%



static bool nft_payload_fast_eval(const struct nft_expr *expr,
				  struct nft_regs *regs,
				  const struct nft_pktinfo *pkt)
{
	const struct nft_payload *priv = nft_expr_priv(expr);
	const struct sk_buff *skb = pkt->skb;
	u32 *dest = &regs->data[priv->dreg];
	unsigned char *ptr;

	if (priv->base == NFT_PAYLOAD_NETWORK_HEADER)
		ptr = skb_network_header(skb);
	else {
		if (!pkt->tprot_set)
			return false;
		ptr = skb_network_header(skb) + pkt->xt.thoff;
	}

	ptr += priv->offset;

	if (unlikely(ptr + priv->len > skb_tail_pointer(skb)))
		return false;

	*dest = 0;
	if (priv->len == 2)
		*(u16 *)dest = *(u16 *)ptr;
	else if (priv->len == 4)
		*(u32 *)dest = *(u32 *)ptr;
	else
		*(u8 *)dest = *(u8 *)ptr;
	return true;
}

Contributors
Person Tokens Prop Commits CommitProp
Patrick McHardy 177 89.85% 4 57.14%
Liping Zhang 13 6.60% 2 28.57%
Pablo Neira Ayuso 7 3.55% 1 14.29%
Total 197 100.00% 7 100.00%


DEFINE_STATIC_KEY_FALSE(nft_counters_enabled);



static noinline void nft_update_chain_stats(const struct nft_chain *chain,
					    const struct nft_pktinfo *pkt)
{
	struct nft_stats *stats;

	local_bh_disable();
	stats = this_cpu_ptr(rcu_dereference(nft_base_chain(chain)->stats));
	u64_stats_update_begin(&stats->syncp);
	stats->pkts++;
	stats->bytes += pkt->skb->len;
	u64_stats_update_end(&stats->syncp);
	local_bh_enable();
}

Contributors
Person Tokens Prop Commits CommitProp
Pablo Neira Ayuso 76 100.00% 1 100.00%
Total 76 100.00% 1 100.00%


struct nft_jumpstack {
	
const struct nft_chain	*chain;
	
const struct nft_rule	*rule;
	
int			rulenum;
};


unsigned int

nft_do_chain(struct nft_pktinfo *pkt, void *priv)
{
	const struct nft_chain *chain = priv, *basechain = chain;
	const struct net *net = nft_net(pkt);
	const struct nft_rule *rule;
	const struct nft_expr *expr, *last;
	struct nft_regs regs;
	unsigned int stackptr = 0;
	struct nft_jumpstack jumpstack[NFT_JUMP_STACK_SIZE];
	int rulenum;
	unsigned int gencursor = nft_genmask_cur(net);
	struct nft_traceinfo info;

	info.trace = false;
	if (static_branch_unlikely(&nft_trace_enabled))
		nft_trace_init(&info, pkt, &regs.verdict, basechain);
do_chain:
	rulenum = 0;
	rule = list_entry(&chain->rules, struct nft_rule, list);
next_rule:
	regs.verdict.code = NFT_CONTINUE;
	list_for_each_entry_continue_rcu(rule, &chain->rules, list) {

		/* This rule is not active, skip. */
		if (unlikely(rule->genmask & gencursor))
			continue;

		rulenum++;

		nft_rule_for_each_expr(expr, last, rule) {
			if (expr->ops == &nft_cmp_fast_ops)
				nft_cmp_fast_eval(expr, &regs);
			else if (expr->ops != &nft_payload_fast_ops ||
				 !nft_payload_fast_eval(expr, &regs, pkt))
				expr->ops->eval(expr, &regs, pkt);

			if (regs.verdict.code != NFT_CONTINUE)
				break;
		}

		switch (regs.verdict.code) {
		case NFT_BREAK:
			regs.verdict.code = NFT_CONTINUE;
			continue;
		case NFT_CONTINUE:
			nft_trace_packet(&info, chain, rule,
					 rulenum, NFT_TRACETYPE_RULE);
			continue;
		}
		break;
	}

	switch (regs.verdict.code & NF_VERDICT_MASK) {
	case NF_ACCEPT:
	case NF_DROP:
	case NF_QUEUE:
	case NF_STOLEN:
		nft_trace_packet(&info, chain, rule,
				 rulenum, NFT_TRACETYPE_RULE);
		return regs.verdict.code;
	}

	switch (regs.verdict.code) {
	case NFT_JUMP:
		BUG_ON(stackptr >= NFT_JUMP_STACK_SIZE);
		jumpstack[stackptr].chain = chain;
		jumpstack[stackptr].rule  = rule;
		jumpstack[stackptr].rulenum = rulenum;
		stackptr++;
		/* fall through */
	case NFT_GOTO:
		nft_trace_packet(&info, chain, rule,
				 rulenum, NFT_TRACETYPE_RULE);

		chain = regs.verdict.chain;
		goto do_chain;
	case NFT_CONTINUE:
		rulenum++;
		/* fall through */
	case NFT_RETURN:
		nft_trace_packet(&info, chain, rule,
				 rulenum, NFT_TRACETYPE_RETURN);
		break;
	default:
		WARN_ON(1);
	}

	if (stackptr > 0) {
		stackptr--;
		chain = jumpstack[stackptr].chain;
		rule  = jumpstack[stackptr].rule;
		rulenum = jumpstack[stackptr].rulenum;
		goto next_rule;
	}

	nft_trace_packet(&info, basechain, NULL, -1,
			 NFT_TRACETYPE_POLICY);

	if (static_branch_unlikely(&nft_counters_enabled))
		nft_update_chain_stats(basechain, pkt);

	return nft_base_chain(basechain)->policy;
}
Contributors
Person Tokens Prop Commits CommitProp
Patrick McHardy 294 56.43% 8 30.77%
Pablo Neira Ayuso 147 28.21% 11 42.31%
Florian Westphal 61 11.71% 3 11.54%
Eric Leblond 9 1.73% 1 3.85%
Eric W. Biedermann 8 1.54% 2 7.69%
Eric Dumazet 2 0.38% 1 3.85%
Total 521 100.00% 26 100.00%


EXPORT_SYMBOL_GPL(nft_do_chain);


static struct nft_expr_type *nft_basic_types[] = {
	&nft_imm_type,
	&nft_cmp_type,
	&nft_lookup_type,
	&nft_bitwise_type,
	&nft_byteorder_type,
	&nft_payload_type,
	&nft_dynset_type,
	&nft_range_type,
};



int __init nf_tables_core_module_init(void)
{
	int err, i;

	for (i = 0; i < ARRAY_SIZE(nft_basic_types); i++) {
		err = nft_register_expr(nft_basic_types[i]);
		if (err)
			goto err;
	}

	return 0;

err:
	while (i-- > 0)
		nft_unregister_expr(nft_basic_types[i]);
	return err;
}

Contributors
Person Tokens Prop Commits CommitProp
Liping Zhang 38 53.52% 1 25.00%
Patrick McHardy 29 40.85% 2 50.00%
Pablo Neira Ayuso 4 5.63% 1 25.00%
Total 71 100.00% 4 100.00%



void nf_tables_core_module_exit(void)
{
	int i;

	i = ARRAY_SIZE(nft_basic_types);
	while (i-- > 0)
		nft_unregister_expr(nft_basic_types[i]);
}
Contributors
Person Tokens Prop Commits CommitProp
Liping Zhang 23 71.88% 1 50.00%
Patrick McHardy 9 28.12% 1 50.00%
Total 32 100.00% 2 100.00%

Overall Contributors
Person Tokens Prop Commits CommitProp
Patrick McHardy 762 58.12% 13 31.71%
Pablo Neira Ayuso 277 21.13% 13 31.71%
Florian Westphal 139 10.60% 4 9.76%
Liping Zhang 108 8.24% 4 9.76%
Eric W. Biedermann 9 0.69% 3 7.32%
Eric Leblond 9 0.69% 1 2.44%
Joe Perches 4 0.31% 1 2.44%
Eric Dumazet 2 0.15% 1 2.44%
Julia Lawall 1 0.08% 1 2.44%
Total 1311 100.00% 41 100.00%
Directory: net/netfilter

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
Created with cregit.
Person	Tokens	Prop	Commits	CommitProp
Patrick McHardy	59	48.76%	1	16.67%
Florian Westphal	46	38.02%	3	50.00%
Pablo Neira Ayuso	15	12.40%	1	16.67%
Eric W. Biedermann	1	0.83%	1	16.67%
Total	121	100.00%	6	100.00%
cregit-Linux how code gets into the kernel

Release 4.15 net/netfilter/nf_tables_core.c

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