Commit 212e5601 authored by Steffen Klassert's avatar Steffen Klassert
Browse files

ipv6: Add a receive path hook for vti6 in xfrm6_mode_tunnel. 



Add a receive path hook for the IPsec vritual tunnel interface.

Signed-off-by: default avatarSteffen Klassert <steffen.klassert@secunet.com>
parent f59bbdfa

include/net/xfrm.h

+2 −0
Original line number Diff line number Diff line
@@ -1508,6 +1508,8 @@ int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family); 
void xfrm4_local_error(struct sk_buff *skb, u32 mtu);

int xfrm4_mode_tunnel_input_register(struct xfrm_tunnel_notifier *handler);

int xfrm4_mode_tunnel_input_deregister(struct xfrm_tunnel_notifier *handler);

int xfrm6_mode_tunnel_input_register(struct xfrm_tunnel_notifier *handler);

int xfrm6_mode_tunnel_input_deregister(struct xfrm_tunnel_notifier *handler);

int xfrm6_extract_header(struct sk_buff *skb);

int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);

int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi);

net/ipv6/xfrm6_mode_tunnel.c

+69 −0
Original line number Diff line number Diff line
@@ -18,6 +18,65 @@ 
#include <net/ipv6.h>

#include <net/xfrm.h>



/* Informational hook. The decap is still done here. */

static struct xfrm_tunnel_notifier __rcu *rcv_notify_handlers __read_mostly;

static DEFINE_MUTEX(xfrm6_mode_tunnel_input_mutex);



int xfrm6_mode_tunnel_input_register(struct xfrm_tunnel_notifier *handler)

{

	struct xfrm_tunnel_notifier __rcu **pprev;

	struct xfrm_tunnel_notifier *t;

	int ret = -EEXIST;

	int priority = handler->priority;



	mutex_lock(&xfrm6_mode_tunnel_input_mutex);



	for (pprev = &rcv_notify_handlers;

	     (t = rcu_dereference_protected(*pprev,

	     lockdep_is_held(&xfrm6_mode_tunnel_input_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(&xfrm6_mode_tunnel_input_mutex);

	return ret;

}

EXPORT_SYMBOL_GPL(xfrm6_mode_tunnel_input_register);



int xfrm6_mode_tunnel_input_deregister(struct xfrm_tunnel_notifier *handler)

{

	struct xfrm_tunnel_notifier __rcu **pprev;

	struct xfrm_tunnel_notifier *t;

	int ret = -ENOENT;



	mutex_lock(&xfrm6_mode_tunnel_input_mutex);

	for (pprev = &rcv_notify_handlers;

	     (t = rcu_dereference_protected(*pprev,

	     lockdep_is_held(&xfrm6_mode_tunnel_input_mutex))) != NULL;

	     pprev = &t->next) {

		if (t == handler) {

			*pprev = handler->next;

			ret = 0;

			break;

		}

	}

	mutex_unlock(&xfrm6_mode_tunnel_input_mutex);

	synchronize_net();



	return ret;

}

EXPORT_SYMBOL_GPL(xfrm6_mode_tunnel_input_deregister);



static inline void ipip6_ecn_decapsulate(struct sk_buff *skb)

{

	const struct ipv6hdr *outer_iph = ipv6_hdr(skb);
@@ -63,8 +122,15 @@ static int xfrm6_mode_tunnel_output(struct xfrm_state *x, struct sk_buff *skb) 
	return 0;

}



#define for_each_input_rcu(head, handler)	\

	for (handler = rcu_dereference(head);	\

	     handler != NULL;			\

	     handler = rcu_dereference(handler->next))





static int xfrm6_mode_tunnel_input(struct xfrm_state *x, struct sk_buff *skb)

{

	struct xfrm_tunnel_notifier *handler;

	int err = -EINVAL;



	if (XFRM_MODE_SKB_CB(skb)->protocol != IPPROTO_IPV6)
@@ -72,6 +138,9 @@ static int xfrm6_mode_tunnel_input(struct xfrm_state *x, struct sk_buff *skb) 
	if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))

		goto out;



	for_each_input_rcu(rcv_notify_handlers, handler)

		handler->handler(skb);



	err = skb_unclone(skb, GFP_ATOMIC);

	if (err)

		goto out;