cregit-Linux how code gets into the kernel

Release 4.7 net/ipv4/tunnel4.c

Directory: net/ipv4
/* tunnel4.c: Generic IP tunnel transformer.
 *
 * Copyright (C) 2003 David S. Miller (davem@redhat.com)
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <linux/slab.h>
#include <net/icmp.h>
#include <net/ip.h>
#include <net/protocol.h>
#include <net/xfrm.h>


static struct xfrm_tunnel __rcu *tunnel4_handlers __read_mostly;

static struct xfrm_tunnel __rcu *tunnel64_handlers __read_mostly;
static DEFINE_MUTEX(tunnel4_mutex);




static inline struct xfrm_tunnel __rcu **fam_handlers(unsigned short family)
{
	return (family == AF_INET) ? &tunnel4_handlers : &tunnel64_handlers;
}


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eric dumazeteric dumazet13.57%150.00%


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int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family)
{
	struct xfrm_tunnel __rcu **pprev;
	struct xfrm_tunnel *t;

	int ret = -EEXIST;
	int priority = handler->priority;

	mutex_lock(&tunnel4_mutex);

	for (pprev = fam_handlers(family);
	     (t = rcu_dereference_protected(*pprev,
			lockdep_is_held(&tunnel4_mutex))) != NULL;
	     pprev = &t->next) {
		if (t->priority > priority)
			break;
		if (t->priority == priority)
			goto err;
	}

	handler->next = *pprev;
	rcu_assign_pointer(*pprev, handler);

	ret = 0;

err:
	mutex_unlock(&tunnel4_mutex);

	return ret;
}

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eric dumazeteric dumazet2821.37%240.00%


kazunori miyazawakazunori miyazawa53.82%120.00%


pavel emelianovpavel emelianov32.29%120.00%


Total131100.00%5100.00%




EXPORT_SYMBOL(xfrm4_tunnel_register);




int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family)
{
	struct xfrm_tunnel __rcu **pprev;
	struct xfrm_tunnel *t;
	int ret = -ENOENT;

	mutex_lock(&tunnel4_mutex);

	for (pprev = fam_handlers(family);
	     (t = rcu_dereference_protected(*pprev,
			lockdep_is_held(&tunnel4_mutex))) != NULL;
	     pprev = &t->next) {
		if (t == handler) {
			*pprev = handler->next;
			ret = 0;
			break;
		}
	}

	mutex_unlock(&tunnel4_mutex);

	synchronize_net();

	return ret;
}

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kazunori miyazawakazunori miyazawa54.72%125.00%


pavel emelianovpavel emelianov32.83%125.00%


Total106100.00%4100.00%




EXPORT_SYMBOL(xfrm4_tunnel_deregister);


#define for_each_tunnel_rcu(head, handler)		\
	for (handler = rcu_dereference(head);           \
             handler != NULL;                           \
             handler = rcu_dereference(handler->next))	

\
	

static int tunnel4_rcv(struct sk_buff *skb)
{
	struct xfrm_tunnel *handler;

	if (!pskb_may_pull(skb, sizeof(struct iphdr)))
		goto drop;

	for_each_tunnel_rcu(tunnel4_handlers, handler)
		if (!handler->handler(skb))
			return 0;

	icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0);

drop:
	kfree_skb(skb);
	return 0;
}


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eric dumazeteric dumazet79.46%133.33%


Total74100.00%3100.00%



#if IS_ENABLED(CONFIG_IPV6)



static int tunnel64_rcv(struct sk_buff *skb)
{
	struct xfrm_tunnel *handler;

	if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
		goto drop;

	for_each_tunnel_rcu(tunnel64_handlers, handler)
		if (!handler->handler(skb))
			return 0;

	icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0);

drop:
	kfree_skb(skb);
	return 0;
}

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hideaki yoshifujihideaki yoshifuji11.37%133.33%


Total73100.00%3100.00%



#endif




static void tunnel4_err(struct sk_buff *skb, u32 info)
{
	struct xfrm_tunnel *handler;

	for_each_tunnel_rcu(tunnel4_handlers, handler)
		if (!handler->err_handler(skb, info))
			break;
}


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eric dumazeteric dumazet615.79%150.00%


Total38100.00%2100.00%



#if IS_ENABLED(CONFIG_IPV6)



static void tunnel64_err(struct sk_buff *skb, u32 info)
{
	struct xfrm_tunnel *handler;

	for_each_tunnel_rcu(tunnel64_handlers, handler)
		if (!handler->err_handler(skb, info))
			break;
}

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eric dumazeteric dumazet615.79%150.00%


Total38100.00%2100.00%



#endif


static const struct net_protocol tunnel4_protocol = {
	.handler	=	tunnel4_rcv,
	.err_handler	=	tunnel4_err,
	.no_policy	=	1,
	.netns_ok	=	1,
};

#if IS_ENABLED(CONFIG_IPV6)

static const struct net_protocol tunnel64_protocol = {
	.handler	=	tunnel64_rcv,
	.err_handler	=	tunnel64_err,
	.no_policy	=	1,
	.netns_ok	=	1,
};
#endif




static int __init tunnel4_init(void)
{
	if (inet_add_protocol(&tunnel4_protocol, IPPROTO_IPIP)) {
		pr_err("%s: can't add protocol\n", __func__);
		return -EAGAIN;
	}
#if IS_ENABLED(CONFIG_IPV6)
	if (inet_add_protocol(&tunnel64_protocol, IPPROTO_IPV6)) {
		pr_err("tunnel64 init: can't add protocol\n");
		inet_del_protocol(&tunnel4_protocol, IPPROTO_IPIP);
		return -EAGAIN;
	}
#endif
	return 0;
}


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joe perchesjoe perches56.94%125.00%


eric dumazeteric dumazet11.39%125.00%


Total72100.00%4100.00%






static void __exit tunnel4_fini(void)
{
#if IS_ENABLED(CONFIG_IPV6)
	if (inet_del_protocol(&tunnel64_protocol, IPPROTO_IPV6))
		pr_err("tunnel64 close: can't remove protocol\n");
#endif
	if (inet_del_protocol(&tunnel4_protocol, IPPROTO_IPIP))
		pr_err("tunnel4 close: can't remove protocol\n");
}


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kazunori miyazawakazunori miyazawa2144.68%125.00%


joe perchesjoe perches24.26%125.00%


eric dumazeteric dumazet12.13%125.00%


Total47100.00%4100.00%




module_init(tunnel4_init);

module_exit(tunnel4_fini);
MODULE_LICENSE("GPL");

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kazunori miyazawakazunori miyazawa17322.32%16.25%


eric dumazeteric dumazet9612.39%531.25%


pavel emelianovpavel emelianov8310.71%425.00%


joe perchesjoe perches70.90%16.25%


tejun heotejun heo30.39%16.25%


alexey dobriyanalexey dobriyan20.26%16.25%


hideaki yoshifujihideaki yoshifuji10.13%16.25%


Total775100.00%16100.00%

  
Directory: net/ipv4



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