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

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

Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
This commit is contained in:
Steffen Klassert 2013-08-19 08:07:34 +02:00
parent f59bbdfa5c
commit 212e560112
2 changed files with 71 additions and 0 deletions
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2
include/net/xfrm.h
View file

@ -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);

69
net/ipv6/xfrm6_mode_tunnel.c
View file

@ -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;