Release 4.11 net/netfilter/nf_conntrack_expect.c

Directory: net/netfilter
/* Expectation handling for nf_conntrack. */

/* (C) 1999-2001 Paul `Rusty' Russell
 * (C) 2002-2006 Netfilter Core Team <coreteam@netfilter.org>
 * (C) 2003,2004 USAGI/WIDE Project <http://www.linux-ipv6.org>
 * (c) 2005-2012 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.
 */

#include <linux/types.h>
#include <linux/netfilter.h>
#include <linux/skbuff.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/stddef.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/percpu.h>
#include <linux/kernel.h>
#include <linux/jhash.h>
#include <linux/moduleparam.h>
#include <linux/export.h>
#include <net/net_namespace.h>
#include <net/netns/hash.h>

#include <net/netfilter/nf_conntrack.h>
#include <net/netfilter/nf_conntrack_core.h>
#include <net/netfilter/nf_conntrack_expect.h>
#include <net/netfilter/nf_conntrack_helper.h>
#include <net/netfilter/nf_conntrack_tuple.h>
#include <net/netfilter/nf_conntrack_zones.h>


unsigned int nf_ct_expect_hsize __read_mostly;

EXPORT_SYMBOL_GPL(nf_ct_expect_hsize);


struct hlist_head *nf_ct_expect_hash __read_mostly;

EXPORT_SYMBOL_GPL(nf_ct_expect_hash);


unsigned int nf_ct_expect_max __read_mostly;


static struct kmem_cache *nf_ct_expect_cachep __read_mostly;

static unsigned int nf_ct_expect_hashrnd __read_mostly;

/* nf_conntrack_expect helper functions */


void nf_ct_unlink_expect_report(struct nf_conntrack_expect *exp,
				u32 portid, int report)
{
	struct nf_conn_help *master_help = nfct_help(exp->master);
	struct net *net = nf_ct_exp_net(exp);

	NF_CT_ASSERT(master_help);
	NF_CT_ASSERT(!timer_pending(&exp->timeout));

	hlist_del_rcu(&exp->hnode);
	net->ct.expect_count--;

	hlist_del_rcu(&exp->lnode);
	master_help->expecting[exp->class]--;

	nf_ct_expect_event_report(IPEXP_DESTROY, exp, portid, report);
	nf_ct_expect_put(exp);

	NF_CT_STAT_INC(net, expect_delete);
}
Contributors
Person Tokens Prop Commits CommitProp
Martin Josefsson 45 40.54% 1 8.33%
Patrick McHardy 27 24.32% 6 50.00%
Pablo Neira Ayuso 21 18.92% 2 16.67%
Alexey Dobriyan 17 15.32% 2 16.67%
Liping Zhang 1 0.90% 1 8.33%
Total 111 100.00% 12 100.00%


EXPORT_SYMBOL_GPL(nf_ct_unlink_expect_report);



static void nf_ct_expectation_timed_out(unsigned long ul_expect)
{
	struct nf_conntrack_expect *exp = (void *)ul_expect;

	spin_lock_bh(&nf_conntrack_expect_lock);
	nf_ct_unlink_expect(exp);
	spin_unlock_bh(&nf_conntrack_expect_lock);
	nf_ct_expect_put(exp);
}

Contributors
Person Tokens Prop Commits CommitProp
Martin Josefsson 37 86.05% 1 25.00%
Patrick McHardy 4 9.30% 2 50.00%
Jesper Dangaard Brouer 2 4.65% 1 25.00%
Total 43 100.00% 4 100.00%



static unsigned int nf_ct_expect_dst_hash(const struct net *n, const struct nf_conntrack_tuple *tuple)
{
	unsigned int hash, seed;

	get_random_once(&nf_ct_expect_hashrnd, sizeof(nf_ct_expect_hashrnd));

	seed = nf_ct_expect_hashrnd ^ net_hash_mix(n);

	hash = jhash2(tuple->dst.u3.all, ARRAY_SIZE(tuple->dst.u3.all),
		      (((tuple->dst.protonum ^ tuple->src.l3num) << 16) |
		       (__force __u16)tuple->dst.u.all) ^ seed);

	return reciprocal_scale(hash, nf_ct_expect_hsize);
}

Contributors
Person Tokens Prop Commits CommitProp
Patrick McHardy 77 69.37% 2 33.33%
Florian Westphal 26 23.42% 2 33.33%
Daniel Borkmann 4 3.60% 1 16.67%
Al Viro 4 3.60% 1 16.67%
Total 111 100.00% 6 100.00%


static bool

nf_ct_exp_equal(const struct nf_conntrack_tuple *tuple,
		const struct nf_conntrack_expect *i,
		const struct nf_conntrack_zone *zone,
		const struct net *net)
{
	return nf_ct_tuple_mask_cmp(tuple, &i->tuple, &i->mask) &&
	       net_eq(net, nf_ct_net(i->master)) &&
	       nf_ct_zone_equal_any(i->master, zone);
}

Contributors
Person Tokens Prop Commits CommitProp
Florian Westphal 67 100.00% 1 100.00%
Total 67 100.00% 1 100.00%


struct nf_conntrack_expect *

__nf_ct_expect_find(struct net *net,
		    const struct nf_conntrack_zone *zone,
		    const struct nf_conntrack_tuple *tuple)
{
	struct nf_conntrack_expect *i;
	unsigned int h;

	if (!net->ct.expect_count)
		return NULL;

	h = nf_ct_expect_dst_hash(net, tuple);
	hlist_for_each_entry_rcu(i, &nf_ct_expect_hash[h], hnode) {
		if (nf_ct_exp_equal(tuple, i, zone, net))
			return i;
	}
	return NULL;
}
Contributors
Person Tokens Prop Commits CommitProp
Martin Josefsson 35 42.17% 1 10.00%
Patrick McHardy 26 31.33% 4 40.00%
Alexey Dobriyan 10 12.05% 1 10.00%
Florian Westphal 6 7.23% 3 30.00%
Daniel Borkmann 6 7.23% 1 10.00%
Total 83 100.00% 10 100.00%


EXPORT_SYMBOL_GPL(__nf_ct_expect_find);

/* Just find a expectation corresponding to a tuple. */

struct nf_conntrack_expect *

nf_ct_expect_find_get(struct net *net,
		      const struct nf_conntrack_zone *zone,
		      const struct nf_conntrack_tuple *tuple)
{
	struct nf_conntrack_expect *i;

	rcu_read_lock();
	i = __nf_ct_expect_find(net, zone, tuple);
	if (i && !atomic_inc_not_zero(&i->use))
		i = NULL;
	rcu_read_unlock();

	return i;
}
Contributors
Person Tokens Prop Commits CommitProp
Martin Josefsson 38 57.58% 1 16.67%
Patrick McHardy 17 25.76% 3 50.00%
Alexey Dobriyan 7 10.61% 1 16.67%
Daniel Borkmann 4 6.06% 1 16.67%
Total 66 100.00% 6 100.00%


EXPORT_SYMBOL_GPL(nf_ct_expect_find_get);

/* If an expectation for this connection is found, it gets delete from
 * global list then returned. */

struct nf_conntrack_expect *

nf_ct_find_expectation(struct net *net,
		       const struct nf_conntrack_zone *zone,
		       const struct nf_conntrack_tuple *tuple)
{
	struct nf_conntrack_expect *i, *exp = NULL;
	unsigned int h;

	if (!net->ct.expect_count)
		return NULL;

	h = nf_ct_expect_dst_hash(net, tuple);
	hlist_for_each_entry(i, &nf_ct_expect_hash[h], hnode) {
		if (!(i->flags & NF_CT_EXPECT_INACTIVE) &&
		    nf_ct_exp_equal(tuple, i, zone, net)) {
			exp = i;
			break;
		}
	}
	if (!exp)
		return NULL;

	/* If master is not in hash table yet (ie. packet hasn't left
           this machine yet), how can other end know about expected?
           Hence these are not the droids you are looking for (if
           master ct never got confirmed, we'd hold a reference to it
           and weird things would happen to future packets). */
	if (!nf_ct_is_confirmed(exp->master))
		return NULL;

	/* Avoid race with other CPUs, that for exp->master ct, is
         * about to invoke ->destroy(), or nf_ct_delete() via timeout
         * or early_drop().
         *
         * The atomic_inc_not_zero() check tells:  If that fails, we
         * know that the ct is being destroyed.  If it succeeds, we
         * can be sure the ct cannot disappear underneath.
         */
	if (unlikely(nf_ct_is_dying(exp->master) ||
		     !atomic_inc_not_zero(&exp->master->ct_general.use)))
		return NULL;

	if (exp->flags & NF_CT_EXPECT_PERMANENT) {
		atomic_inc(&exp->use);
		return exp;
	} else if (del_timer(&exp->timeout)) {
		nf_ct_unlink_expect(exp);
		return exp;
	}
	/* Undo exp->master refcnt increase, if del_timer() failed */
	nf_ct_put(exp->master);

	return NULL;
}

Contributors
Person Tokens Prop Commits CommitProp
Martin Josefsson 65 32.18% 1 9.09%
Patrick McHardy 55 27.23% 3 27.27%
Jesper Dangaard Brouer 37 18.32% 1 9.09%
Yasuyuki Kozakai 23 11.39% 1 9.09%
Alexey Dobriyan 10 4.95% 1 9.09%
Daniel Borkmann 6 2.97% 1 9.09%
Florian Westphal 6 2.97% 3 27.27%
Total 202 100.00% 11 100.00%

/* delete all expectations for this conntrack */


void nf_ct_remove_expectations(struct nf_conn *ct)
{
	struct nf_conn_help *help = nfct_help(ct);
	struct nf_conntrack_expect *exp;
	struct hlist_node *next;

	/* Optimization: most connection never expect any others. */
	if (!help)
		return;

	spin_lock_bh(&nf_conntrack_expect_lock);
	hlist_for_each_entry_safe(exp, next, &help->expectations, lnode) {
		if (del_timer(&exp->timeout)) {
			nf_ct_unlink_expect(exp);
			nf_ct_expect_put(exp);
		}
	}
	spin_unlock_bh(&nf_conntrack_expect_lock);
}
Contributors
Person Tokens Prop Commits CommitProp
Martin Josefsson 51 61.45% 1 25.00%
Patrick McHardy 20 24.10% 2 50.00%
Jesper Dangaard Brouer 12 14.46% 1 25.00%
Total 83 100.00% 4 100.00%


EXPORT_SYMBOL_GPL(nf_ct_remove_expectations);

/* Would two expected things clash? */


static inline int expect_clash(const struct nf_conntrack_expect *a,
			       const struct nf_conntrack_expect *b)
{
	/* Part covered by intersection of masks must be unequal,
           otherwise they clash */
	struct nf_conntrack_tuple_mask intersect_mask;
	int count;

	intersect_mask.src.u.all = a->mask.src.u.all & b->mask.src.u.all;

	for (count = 0; count < NF_CT_TUPLE_L3SIZE; count++){
		intersect_mask.src.u3.all[count] =
			a->mask.src.u3.all[count] & b->mask.src.u3.all[count];
	}

	return nf_ct_tuple_mask_cmp(&a->tuple, &b->tuple, &intersect_mask) &&
	       net_eq(nf_ct_net(a->master), nf_ct_net(b->master)) &&
	       nf_ct_zone_equal_any(a->master, nf_ct_zone(b->master));
}

Contributors
Person Tokens Prop Commits CommitProp
Martin Josefsson 123 79.35% 1 16.67%
Florian Westphal 17 10.97% 1 16.67%
Joe Stringer 11 7.10% 1 16.67%
Daniel Borkmann 3 1.94% 2 33.33%
Patrick McHardy 1 0.65% 1 16.67%
Total 155 100.00% 6 100.00%



static inline int expect_matches(const struct nf_conntrack_expect *a,
				 const struct nf_conntrack_expect *b)
{
	return a->master == b->master && a->class == b->class &&
	       nf_ct_tuple_equal(&a->tuple, &b->tuple) &&
	       nf_ct_tuple_mask_equal(&a->mask, &b->mask) &&
	       net_eq(nf_ct_net(a->master), nf_ct_net(b->master)) &&
	       nf_ct_zone_equal_any(a->master, nf_ct_zone(b->master));
}

Contributors
Person Tokens Prop Commits CommitProp
Martin Josefsson 53 56.99% 1 14.29%
Patrick McHardy 20 21.51% 3 42.86%
Florian Westphal 17 18.28% 1 14.29%
Daniel Borkmann 3 3.23% 2 28.57%
Total 93 100.00% 7 100.00%

/* Generally a bad idea to call this: could have matched already. */


void nf_ct_unexpect_related(struct nf_conntrack_expect *exp)
{
	spin_lock_bh(&nf_conntrack_expect_lock);
	if (del_timer(&exp->timeout)) {
		nf_ct_unlink_expect(exp);
		nf_ct_expect_put(exp);
	}
	spin_unlock_bh(&nf_conntrack_expect_lock);
}
Contributors
Person Tokens Prop Commits CommitProp
Martin Josefsson 35 79.55% 1 20.00%
Patrick McHardy 7 15.91% 3 60.00%
Jesper Dangaard Brouer 2 4.55% 1 20.00%
Total 44 100.00% 5 100.00%


EXPORT_SYMBOL_GPL(nf_ct_unexpect_related);

/* We don't increase the master conntrack refcount for non-fulfilled
 * conntracks. During the conntrack destruction, the expectations are
 * always killed before the conntrack itself */


struct nf_conntrack_expect *nf_ct_expect_alloc(struct nf_conn *me)
{
	struct nf_conntrack_expect *new;

	new = kmem_cache_alloc(nf_ct_expect_cachep, GFP_ATOMIC);
	if (!new)
		return NULL;

	new->master = me;
	atomic_set(&new->use, 1);
	return new;
}
Contributors
Person Tokens Prop Commits CommitProp
Martin Josefsson 51 96.23% 1 50.00%
Patrick McHardy 2 3.77% 1 50.00%
Total 53 100.00% 2 100.00%


EXPORT_SYMBOL_GPL(nf_ct_expect_alloc);



void nf_ct_expect_init(struct nf_conntrack_expect *exp, unsigned int class,
		       u_int8_t family,
		       const union nf_inet_addr *saddr,
		       const union nf_inet_addr *daddr,
		       u_int8_t proto, const __be16 *src, const __be16 *dst)
{
	int len;

	if (family == AF_INET)
		len = 4;
	else
		len = 16;

	exp->flags = 0;
	exp->class = class;
	exp->expectfn = NULL;
	exp->helper = NULL;
	exp->tuple.src.l3num = family;
	exp->tuple.dst.protonum = proto;

	if (saddr) {
		memcpy(&exp->tuple.src.u3, saddr, len);
		if (sizeof(exp->tuple.src.u3) > len)
			/* address needs to be cleared for nf_ct_tuple_equal */
			memset((void *)&exp->tuple.src.u3 + len, 0x00,
			       sizeof(exp->tuple.src.u3) - len);
		memset(&exp->mask.src.u3, 0xFF, len);
		if (sizeof(exp->mask.src.u3) > len)
			memset((void *)&exp->mask.src.u3 + len, 0x00,
			       sizeof(exp->mask.src.u3) - len);
	} else {
		memset(&exp->tuple.src.u3, 0x00, sizeof(exp->tuple.src.u3));
		memset(&exp->mask.src.u3, 0x00, sizeof(exp->mask.src.u3));
	}

	if (src) {
		exp->tuple.src.u.all = *src;
		exp->mask.src.u.all = htons(0xFFFF);
	} else {
		exp->tuple.src.u.all = 0;
		exp->mask.src.u.all = 0;
	}

	memcpy(&exp->tuple.dst.u3, daddr, len);
	if (sizeof(exp->tuple.dst.u3) > len)
		/* address needs to be cleared for nf_ct_tuple_equal */
		memset((void *)&exp->tuple.dst.u3 + len, 0x00,
		       sizeof(exp->tuple.dst.u3) - len);

	exp->tuple.dst.u.all = *dst;

#ifdef CONFIG_NF_NAT_NEEDED
	memset(&exp->saved_addr, 0, sizeof(exp->saved_addr));
	memset(&exp->saved_proto, 0, sizeof(exp->saved_proto));
#endif
}
Contributors
Person Tokens Prop Commits CommitProp
Patrick McHardy 425 90.43% 5 55.56%
Pablo Neira Ayuso 39 8.30% 1 11.11%
Al Viro 3 0.64% 1 11.11%
Jan Engelhardt 3 0.64% 2 22.22%
Total 470 100.00% 9 100.00%


EXPORT_SYMBOL_GPL(nf_ct_expect_init);



static void nf_ct_expect_free_rcu(struct rcu_head *head)
{
	struct nf_conntrack_expect *exp;

	exp = container_of(head, struct nf_conntrack_expect, rcu);
	kmem_cache_free(nf_ct_expect_cachep, exp);
}

Contributors
Person Tokens Prop Commits CommitProp
Patrick McHardy 35 100.00% 1 100.00%
Total 35 100.00% 1 100.00%



void nf_ct_expect_put(struct nf_conntrack_expect *exp)
{
	if (atomic_dec_and_test(&exp->use))
		call_rcu(&exp->rcu, nf_ct_expect_free_rcu);
}
Contributors
Person Tokens Prop Commits CommitProp
Martin Josefsson 23 76.67% 1 33.33%
Patrick McHardy 7 23.33% 2 66.67%
Total 30 100.00% 3 100.00%


EXPORT_SYMBOL_GPL(nf_ct_expect_put);



static void nf_ct_expect_insert(struct nf_conntrack_expect *exp)
{
	struct nf_conn_help *master_help = nfct_help(exp->master);
	struct nf_conntrack_helper *helper;
	struct net *net = nf_ct_exp_net(exp);
	unsigned int h = nf_ct_expect_dst_hash(net, &exp->tuple);

	/* two references : one for hash insert, one for the timer */
	atomic_add(2, &exp->use);

	hlist_add_head_rcu(&exp->lnode, &master_help->expectations);
	master_help->expecting[exp->class]++;

	hlist_add_head_rcu(&exp->hnode, &nf_ct_expect_hash[h]);
	net->ct.expect_count++;

	setup_timer(&exp->timeout, nf_ct_expectation_timed_out,
		    (unsigned long)exp);
	helper = rcu_dereference_protected(master_help->helper,
					   lockdep_is_held(&nf_conntrack_expect_lock));
	if (helper) {
		exp->timeout.expires = jiffies +
			helper->expect_policy[exp->class].timeout * HZ;
	}
	add_timer(&exp->timeout);

	NF_CT_STAT_INC(net, expect_create);
}

Contributors
Person Tokens Prop Commits CommitProp
Martin Josefsson 73 40.56% 1 5.56%
Patrick McHardy 52 28.89% 6 33.33%
Pablo Neira Ayuso 20 11.11% 2 11.11%
Alexey Dobriyan 17 9.44% 2 11.11%
Eric Dumazet 12 6.67% 2 11.11%
Florian Westphal 3 1.67% 2 11.11%
Liping Zhang 1 0.56% 1 5.56%
Gao Feng 1 0.56% 1 5.56%
Jesper Dangaard Brouer 1 0.56% 1 5.56%
Total 180 100.00% 18 100.00%

/* Race with expectations being used means we could have none to find; OK. */


static void evict_oldest_expect(struct nf_conn *master,
				struct nf_conntrack_expect *new)
{
	struct nf_conn_help *master_help = nfct_help(master);
	struct nf_conntrack_expect *exp, *last = NULL;

	hlist_for_each_entry(exp, &master_help->expectations, lnode) {
		if (exp->class == new->class)
			last = exp;
	}

	if (last && del_timer(&last->timeout)) {
		nf_ct_unlink_expect(last);
		nf_ct_expect_put(last);
	}
}

Contributors
Person Tokens Prop Commits CommitProp
Patrick McHardy 49 58.33% 3 75.00%
Martin Josefsson 35 41.67% 1 25.00%
Total 84 100.00% 4 100.00%



static inline int __nf_ct_expect_check(struct nf_conntrack_expect *expect)
{
	const struct nf_conntrack_expect_policy *p;
	struct nf_conntrack_expect *i;
	struct nf_conn *master = expect->master;
	struct nf_conn_help *master_help = nfct_help(master);
	struct nf_conntrack_helper *helper;
	struct net *net = nf_ct_exp_net(expect);
	struct hlist_node *next;
	unsigned int h;
	int ret = 0;

	if (!master_help) {
		ret = -ESHUTDOWN;
		goto out;
	}
	h = nf_ct_expect_dst_hash(net, &expect->tuple);
	hlist_for_each_entry_safe(i, next, &nf_ct_expect_hash[h], hnode) {
		if (expect_matches(i, expect)) {
			if (del_timer(&i->timeout)) {
				nf_ct_unlink_expect(i);
				nf_ct_expect_put(i);
				break;
			}
		} else if (expect_clash(i, expect)) {
			ret = -EBUSY;
			goto out;
		}
	}
	/* Will be over limit? */
	helper = rcu_dereference_protected(master_help->helper,
					   lockdep_is_held(&nf_conntrack_expect_lock));
	if (helper) {
		p = &helper->expect_policy[expect->class];
		if (p->max_expected &&
		    master_help->expecting[expect->class] >= p->max_expected) {
			evict_oldest_expect(master, expect);
			if (master_help->expecting[expect->class]
						>= p->max_expected) {
				ret = -EMFILE;
				goto out;
			}
		}
	}

	if (net->ct.expect_count >= nf_ct_expect_max) {
		net_warn_ratelimited("nf_conntrack: expectation table full\n");
		ret = -EMFILE;
	}
out:
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
Patrick McHardy 101 36.33% 4 23.53%
Martin Josefsson 100 35.97% 1 5.88%
Pablo Neira Ayuso 47 16.91% 4 23.53%
Alexey Dobriyan 16 5.76% 2 11.76%
Eric Dumazet 8 2.88% 1 5.88%
Florian Westphal 3 1.08% 2 11.76%
Jarno Rajahalme 1 0.36% 1 5.88%
Joe Perches 1 0.36% 1 5.88%
Jesper Dangaard Brouer 1 0.36% 1 5.88%
Total 278 100.00% 17 100.00%



int nf_ct_expect_related_report(struct nf_conntrack_expect *expect,
				u32 portid, int report)
{
	int ret;

	spin_lock_bh(&nf_conntrack_expect_lock);
	ret = __nf_ct_expect_check(expect);
	if (ret < 0)
		goto out;

	nf_ct_expect_insert(expect);

	spin_unlock_bh(&nf_conntrack_expect_lock);
	nf_ct_expect_event_report(IPEXP_NEW, expect, portid, report);
	return 0;
out:
	spin_unlock_bh(&nf_conntrack_expect_lock);
	return ret;
}
Contributors
Person Tokens Prop Commits CommitProp
Pablo Neira Ayuso 58 75.32% 2 25.00%
Martin Josefsson 11 14.29% 1 12.50%
Jesper Dangaard Brouer 3 3.90% 1 12.50%
Patrick McHardy 3 3.90% 2 25.00%
Jarno Rajahalme 2 2.60% 2 25.00%
Total 77 100.00% 8 100.00%


EXPORT_SYMBOL_GPL(nf_ct_expect_related_report);

#ifdef CONFIG_NF_CONNTRACK_PROCFS

struct ct_expect_iter_state {
	
struct seq_net_private p;
	
unsigned int bucket;
};



static struct hlist_node *ct_expect_get_first(struct seq_file *seq)
{
	struct ct_expect_iter_state *st = seq->private;
	struct hlist_node *n;

	for (st->bucket = 0; st->bucket < nf_ct_expect_hsize; st->bucket++) {
		n = rcu_dereference(hlist_first_rcu(&nf_ct_expect_hash[st->bucket]));
		if (n)
			return n;
	}
	return NULL;
}

Contributors
Person Tokens Prop Commits CommitProp
Patrick McHardy 48 64.86% 2 40.00%
Martin Josefsson 21 28.38% 1 20.00%
Eric Dumazet 4 5.41% 1 20.00%
Florian Westphal 1 1.35% 1 20.00%
Total 74 100.00% 5 100.00%



static struct hlist_node *ct_expect_get_next(struct seq_file *seq,
					     struct hlist_node *head)
{
	struct ct_expect_iter_state *st = seq->private;

	head = rcu_dereference(hlist_next_rcu(head));
	while (head == NULL) {
		if (++st->bucket >= nf_ct_expect_hsize)
			return NULL;
		head = rcu_dereference(hlist_first_rcu(&nf_ct_expect_hash[st->bucket]));
	}
	return head;
}

Contributors
Person Tokens Prop Commits CommitProp
Patrick McHardy 58 76.32% 2 40.00%
Martin Josefsson 10 13.16% 1 20.00%
Eric Dumazet 7 9.21% 1 20.00%
Florian Westphal 1 1.32% 1 20.00%
Total 76 100.00% 5 100.00%



static struct hlist_node *ct_expect_get_idx(struct seq_file *seq, loff_t pos)
{
	struct hlist_node *head = ct_expect_get_first(seq);

	if (head)
		while (pos && (head = ct_expect_get_next(seq, head)))
			pos--;
	return pos ? NULL : head;
}

Contributors
Person Tokens Prop Commits CommitProp
Patrick McHardy 55 100.00% 1 100.00%
Total 55 100.00% 1 100.00%


static void *exp_seq_start(struct seq_file *seq, loff_t *pos)
	__acquires
(RCU)
{
	rcu_read_lock();
	return ct_expect_get_idx(seq, *pos);
}

Contributors
Person Tokens Prop Commits CommitProp
Patrick McHardy 27 84.38% 2 50.00%
Eric Dumazet 3 9.38% 1 25.00%
Martin Josefsson 2 6.25% 1 25.00%
Total 32 100.00% 4 100.00%



static void *exp_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
	(*pos)++;
	return ct_expect_get_next(seq, v);
}

Contributors
Person Tokens Prop Commits CommitProp
Martin Josefsson 24 70.59% 1 50.00%
Patrick McHardy 10 29.41% 1 50.00%
Total 34 100.00% 2 100.00%


static void exp_seq_stop(struct seq_file *seq, void *v)
	__releases
(RCU)
{
	rcu_read_unlock();
}

Contributors
Person Tokens Prop Commits CommitProp
Martin Josefsson 15 68.18% 1 25.00%
Patrick McHardy 4 18.18% 2 50.00%
Eric Dumazet 3 13.64% 1 25.00%
Total 22 100.00% 4 100.00%



static int exp_seq_show(struct seq_file *s, void *v)
{
	struct nf_conntrack_expect *expect;
	struct nf_conntrack_helper *helper;
	struct hlist_node *n = v;
	char *delim = "";

	expect = hlist_entry(n, struct nf_conntrack_expect, hnode);

	if (expect->timeout.function)
		seq_printf(s, "%ld ", timer_pending(&expect->timeout)
			   ? (long)(expect->timeout.expires - jiffies)/HZ : 0);
	else
		seq_printf(s, "- ");
	seq_printf(s, "l3proto = %u proto=%u ",
		   expect->tuple.src.l3num,
		   expect->tuple.dst.protonum);
	print_tuple(s, &expect->tuple,
		    __nf_ct_l3proto_find(expect->tuple.src.l3num),
		    __nf_ct_l4proto_find(expect->tuple.src.l3num,
				       expect->tuple.dst.protonum));

	if (expect->flags & NF_CT_EXPECT_PERMANENT) {
		seq_printf(s, "PERMANENT");
		delim = ",";
	}
	if (expect->flags & NF_CT_EXPECT_INACTIVE) {
		seq_printf(s, "%sINACTIVE", delim);
		delim = ",";
	}
	if (expect->flags & NF_CT_EXPECT_USERSPACE)
		seq_printf(s, "%sUSERSPACE", delim);

	helper = rcu_dereference(nfct_help(expect->master)->helper);
	if (helper) {
		seq_printf(s, "%s%s", expect->flags ? " " : "", helper->name);
		if (helper->expect_policy[expect->class].name[0])
			seq_printf(s, "/%s",
				   helper->expect_policy[expect->class].name);
	}

	seq_putc(s, '\n');

	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
Martin Josefsson 140 45.90% 2 22.22%
Patrick McHardy 136 44.59% 4 44.44%
Pablo Neira Ayuso 23 7.54% 1 11.11%
Joe Perches 3 0.98% 1 11.11%
Liping Zhang 3 0.98% 1 11.11%
Total 305 100.00% 9 100.00%


static const struct seq_operations exp_seq_ops = {
	.start = exp_seq_start,
	.next = exp_seq_next,
	.stop = exp_seq_stop,
	.show = exp_seq_show
};



static int exp_open(struct inode *inode, struct file *file)
{
	return seq_open_net(inode, file, &exp_seq_ops,
			sizeof(struct ct_expect_iter_state));
}

Contributors
Person Tokens Prop Commits CommitProp
Martin Josefsson 23 69.70% 1 25.00%
Pavel Emelyanov 5 15.15% 1 25.00%
Alexey Dobriyan 3 9.09% 1 25.00%
Patrick McHardy 2 6.06% 1 25.00%
Total 33 100.00% 4 100.00%


static const struct file_operations exp_file_ops = {
	.owner   = THIS_MODULE,
	.open    = exp_open,
	.read    = seq_read,
	.llseek  = seq_lseek,
	.release = seq_release_net,
};
#endif /* CONFIG_NF_CONNTRACK_PROCFS */



static int exp_proc_init(struct net *net)
{
#ifdef CONFIG_NF_CONNTRACK_PROCFS
	struct proc_dir_entry *proc;
	kuid_t root_uid;
	kgid_t root_gid;

	proc = proc_create("nf_conntrack_expect", 0440, net->proc_net,
			   &exp_file_ops);
	if (!proc)
		return -ENOMEM;

	root_uid = make_kuid(net->user_ns, 0);
	root_gid = make_kgid(net->user_ns, 0);
	if (uid_valid(root_uid) && gid_valid(root_gid))
		proc_set_user(proc, root_uid, root_gid);
#endif /* CONFIG_NF_CONNTRACK_PROCFS */
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
Philip Whineray 49 49.49% 1 20.00%
Patrick McHardy 39 39.39% 1 20.00%
Gao Feng 5 5.05% 1 20.00%
Alexey Dobriyan 4 4.04% 1 20.00%
Jan Engelhardt 2 2.02% 1 20.00%
Total 99 100.00% 5 100.00%



static void exp_proc_remove(struct net *net)
{
#ifdef CONFIG_NF_CONNTRACK_PROCFS
	remove_proc_entry("nf_conntrack_expect", net->proc_net);
#endif /* CONFIG_NF_CONNTRACK_PROCFS */
}

Contributors
Person Tokens Prop Commits CommitProp
Patrick McHardy 15 57.69% 1 25.00%
Gao Feng 5 19.23% 1 25.00%
Alexey Dobriyan 4 15.38% 1 25.00%
Jan Engelhardt 2 7.69% 1 25.00%
Total 26 100.00% 4 100.00%

module_param_named(expect_hashsize, nf_ct_expect_hsize, uint, 0400);



int nf_conntrack_expect_pernet_init(struct net *net)
{
	net->ct.expect_count = 0;
	return exp_proc_init(net);
}

Contributors
Person Tokens Prop Commits CommitProp
Alexey Dobriyan 13 54.17% 1 20.00%
Patrick McHardy 9 37.50% 2 40.00%
Gao Feng 1 4.17% 1 20.00%
Florian Westphal 1 4.17% 1 20.00%
Total 24 100.00% 5 100.00%



void nf_conntrack_expect_pernet_fini(struct net *net)
{
	exp_proc_remove(net);
}

Contributors
Person Tokens Prop Commits CommitProp
Alexey Dobriyan 7 46.67% 2 50.00%
Patrick McHardy 6 40.00% 1 25.00%
Gao Feng 2 13.33% 1 25.00%
Total 15 100.00% 4 100.00%



int nf_conntrack_expect_init(void)
{
	if (!nf_ct_expect_hsize) {
		nf_ct_expect_hsize = nf_conntrack_htable_size / 256;
		if (!nf_ct_expect_hsize)
			nf_ct_expect_hsize = 1;
	}
	nf_ct_expect_max = nf_ct_expect_hsize * 4;
	nf_ct_expect_cachep = kmem_cache_create("nf_conntrack_expect",
				sizeof(struct nf_conntrack_expect),
				0, 0, NULL);
	if (!nf_ct_expect_cachep)
		return -ENOMEM;

	nf_ct_expect_hash = nf_ct_alloc_hashtable(&nf_ct_expect_hsize, 0);
	if (!nf_ct_expect_hash) {
		kmem_cache_destroy(nf_ct_expect_cachep);
		return -ENOMEM;
	}

	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
Gao Feng 60 65.22% 1 33.33%
Florian Westphal 26 28.26% 1 33.33%
Alexey Dobriyan 6 6.52% 1 33.33%
Total 92 100.00% 3 100.00%



void nf_conntrack_expect_fini(void)
{
	rcu_barrier(); /* Wait for call_rcu() before destroy */
	kmem_cache_destroy(nf_ct_expect_cachep);
	nf_ct_free_hashtable(nf_ct_expect_hash, nf_ct_expect_hsize);
}
Contributors
Person Tokens Prop Commits CommitProp
Florian Westphal 7 30.43% 1 25.00%
Jesper Dangaard Brouer 6 26.09% 1 25.00%
Patrick McHardy 5 21.74% 1 25.00%
Gao Feng 5 21.74% 1 25.00%
Total 23 100.00% 4 100.00%

Overall Contributors
Person Tokens Prop Commits CommitProp
Patrick McHardy 1430 41.78% 23 30.26%
Martin Josefsson 1127 32.92% 2 2.63%
Pablo Neira Ayuso 210 6.13% 7 9.21%
Florian Westphal 201 5.87% 4 5.26%
Alexey Dobriyan 120 3.51% 6 7.89%
Gao Feng 79 2.31% 4 5.26%
Jesper Dangaard Brouer 64 1.87% 3 3.95%
Philip Whineray 49 1.43% 1 1.32%
Eric Dumazet 37 1.08% 4 5.26%
Daniel Borkmann 26 0.76% 3 3.95%
Yasuyuki Kozakai 23 0.67% 1 1.32%
Joe Stringer 11 0.32% 1 1.32%
Jan Engelhardt 9 0.26% 3 3.95%
Al Viro 7 0.20% 1 1.32%
Paul Gortmaker 6 0.18% 2 2.63%
Pavel Emelyanov 5 0.15% 1 1.32%
Liping Zhang 5 0.15% 2 2.63%
Joe Perches 4 0.12% 2 2.63%
Jarno Rajahalme 3 0.09% 2 2.63%
Eric W. Biedermann 3 0.09% 1 1.32%
Christoph Lameter 2 0.06% 1 1.32%
Philippe De Muyter 1 0.03% 1 1.32%
Arjan van de Ven 1 0.03% 1 1.32%
Total 3423 100.00% 76 100.00%
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
Martin Josefsson	45	40.54%	1	8.33%
Patrick McHardy	27	24.32%	6	50.00%
Pablo Neira Ayuso	21	18.92%	2	16.67%
Alexey Dobriyan	17	15.32%	2	16.67%
Liping Zhang	1	0.90%	1	8.33%
Total	111	100.00%	12	100.00%
cregit-Linux how code gets into the kernel

Release 4.11 net/netfilter/nf_conntrack_expect.c

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Overall Contributors
