![Florian Westphal](/assets/img/avatar_default.png)
None of them have any external callers, make them static. Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
284 lines
6.4 KiB
C
284 lines
6.4 KiB
C
/* xfrm6_protocol.c - Generic xfrm protocol multiplexer for ipv6.
|
|
*
|
|
* Copyright (C) 2013 secunet Security Networks AG
|
|
*
|
|
* Author:
|
|
* Steffen Klassert <steffen.klassert@secunet.com>
|
|
*
|
|
* Based on:
|
|
* net/ipv4/xfrm4_protocol.c
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the License, or (at your option) any later version.
|
|
*/
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/mutex.h>
|
|
#include <linux/skbuff.h>
|
|
#include <linux/icmpv6.h>
|
|
#include <net/ipv6.h>
|
|
#include <net/protocol.h>
|
|
#include <net/xfrm.h>
|
|
|
|
static struct xfrm6_protocol __rcu *esp6_handlers __read_mostly;
|
|
static struct xfrm6_protocol __rcu *ah6_handlers __read_mostly;
|
|
static struct xfrm6_protocol __rcu *ipcomp6_handlers __read_mostly;
|
|
static DEFINE_MUTEX(xfrm6_protocol_mutex);
|
|
|
|
static inline struct xfrm6_protocol __rcu **proto_handlers(u8 protocol)
|
|
{
|
|
switch (protocol) {
|
|
case IPPROTO_ESP:
|
|
return &esp6_handlers;
|
|
case IPPROTO_AH:
|
|
return &ah6_handlers;
|
|
case IPPROTO_COMP:
|
|
return &ipcomp6_handlers;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
#define for_each_protocol_rcu(head, handler) \
|
|
for (handler = rcu_dereference(head); \
|
|
handler != NULL; \
|
|
handler = rcu_dereference(handler->next)) \
|
|
|
|
static int xfrm6_rcv_cb(struct sk_buff *skb, u8 protocol, int err)
|
|
{
|
|
int ret;
|
|
struct xfrm6_protocol *handler;
|
|
struct xfrm6_protocol __rcu **head = proto_handlers(protocol);
|
|
|
|
if (!head)
|
|
return 0;
|
|
|
|
for_each_protocol_rcu(*proto_handlers(protocol), handler)
|
|
if ((ret = handler->cb_handler(skb, err)) <= 0)
|
|
return ret;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int xfrm6_esp_rcv(struct sk_buff *skb)
|
|
{
|
|
int ret;
|
|
struct xfrm6_protocol *handler;
|
|
|
|
XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6 = NULL;
|
|
|
|
for_each_protocol_rcu(esp6_handlers, handler)
|
|
if ((ret = handler->handler(skb)) != -EINVAL)
|
|
return ret;
|
|
|
|
icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
|
|
|
|
kfree_skb(skb);
|
|
return 0;
|
|
}
|
|
|
|
static int xfrm6_esp_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
|
|
u8 type, u8 code, int offset, __be32 info)
|
|
{
|
|
struct xfrm6_protocol *handler;
|
|
|
|
for_each_protocol_rcu(esp6_handlers, handler)
|
|
if (!handler->err_handler(skb, opt, type, code, offset, info))
|
|
return 0;
|
|
|
|
return -ENOENT;
|
|
}
|
|
|
|
static int xfrm6_ah_rcv(struct sk_buff *skb)
|
|
{
|
|
int ret;
|
|
struct xfrm6_protocol *handler;
|
|
|
|
XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6 = NULL;
|
|
|
|
for_each_protocol_rcu(ah6_handlers, handler)
|
|
if ((ret = handler->handler(skb)) != -EINVAL)
|
|
return ret;
|
|
|
|
icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
|
|
|
|
kfree_skb(skb);
|
|
return 0;
|
|
}
|
|
|
|
static int xfrm6_ah_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
|
|
u8 type, u8 code, int offset, __be32 info)
|
|
{
|
|
struct xfrm6_protocol *handler;
|
|
|
|
for_each_protocol_rcu(ah6_handlers, handler)
|
|
if (!handler->err_handler(skb, opt, type, code, offset, info))
|
|
return 0;
|
|
|
|
return -ENOENT;
|
|
}
|
|
|
|
static int xfrm6_ipcomp_rcv(struct sk_buff *skb)
|
|
{
|
|
int ret;
|
|
struct xfrm6_protocol *handler;
|
|
|
|
XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6 = NULL;
|
|
|
|
for_each_protocol_rcu(ipcomp6_handlers, handler)
|
|
if ((ret = handler->handler(skb)) != -EINVAL)
|
|
return ret;
|
|
|
|
icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
|
|
|
|
kfree_skb(skb);
|
|
return 0;
|
|
}
|
|
|
|
static int xfrm6_ipcomp_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
|
|
u8 type, u8 code, int offset, __be32 info)
|
|
{
|
|
struct xfrm6_protocol *handler;
|
|
|
|
for_each_protocol_rcu(ipcomp6_handlers, handler)
|
|
if (!handler->err_handler(skb, opt, type, code, offset, info))
|
|
return 0;
|
|
|
|
return -ENOENT;
|
|
}
|
|
|
|
static const struct inet6_protocol esp6_protocol = {
|
|
.handler = xfrm6_esp_rcv,
|
|
.err_handler = xfrm6_esp_err,
|
|
.flags = INET6_PROTO_NOPOLICY,
|
|
};
|
|
|
|
static const struct inet6_protocol ah6_protocol = {
|
|
.handler = xfrm6_ah_rcv,
|
|
.err_handler = xfrm6_ah_err,
|
|
.flags = INET6_PROTO_NOPOLICY,
|
|
};
|
|
|
|
static const struct inet6_protocol ipcomp6_protocol = {
|
|
.handler = xfrm6_ipcomp_rcv,
|
|
.err_handler = xfrm6_ipcomp_err,
|
|
.flags = INET6_PROTO_NOPOLICY,
|
|
};
|
|
|
|
static const struct xfrm_input_afinfo xfrm6_input_afinfo = {
|
|
.family = AF_INET6,
|
|
.callback = xfrm6_rcv_cb,
|
|
};
|
|
|
|
static inline const struct inet6_protocol *netproto(unsigned char protocol)
|
|
{
|
|
switch (protocol) {
|
|
case IPPROTO_ESP:
|
|
return &esp6_protocol;
|
|
case IPPROTO_AH:
|
|
return &ah6_protocol;
|
|
case IPPROTO_COMP:
|
|
return &ipcomp6_protocol;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
int xfrm6_protocol_register(struct xfrm6_protocol *handler,
|
|
unsigned char protocol)
|
|
{
|
|
struct xfrm6_protocol __rcu **pprev;
|
|
struct xfrm6_protocol *t;
|
|
bool add_netproto = false;
|
|
int ret = -EEXIST;
|
|
int priority = handler->priority;
|
|
|
|
if (!proto_handlers(protocol) || !netproto(protocol))
|
|
return -EINVAL;
|
|
|
|
mutex_lock(&xfrm6_protocol_mutex);
|
|
|
|
if (!rcu_dereference_protected(*proto_handlers(protocol),
|
|
lockdep_is_held(&xfrm6_protocol_mutex)))
|
|
add_netproto = true;
|
|
|
|
for (pprev = proto_handlers(protocol);
|
|
(t = rcu_dereference_protected(*pprev,
|
|
lockdep_is_held(&xfrm6_protocol_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_protocol_mutex);
|
|
|
|
if (add_netproto) {
|
|
if (inet6_add_protocol(netproto(protocol), protocol)) {
|
|
pr_err("%s: can't add protocol\n", __func__);
|
|
ret = -EAGAIN;
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(xfrm6_protocol_register);
|
|
|
|
int xfrm6_protocol_deregister(struct xfrm6_protocol *handler,
|
|
unsigned char protocol)
|
|
{
|
|
struct xfrm6_protocol __rcu **pprev;
|
|
struct xfrm6_protocol *t;
|
|
int ret = -ENOENT;
|
|
|
|
if (!proto_handlers(protocol) || !netproto(protocol))
|
|
return -EINVAL;
|
|
|
|
mutex_lock(&xfrm6_protocol_mutex);
|
|
|
|
for (pprev = proto_handlers(protocol);
|
|
(t = rcu_dereference_protected(*pprev,
|
|
lockdep_is_held(&xfrm6_protocol_mutex))) != NULL;
|
|
pprev = &t->next) {
|
|
if (t == handler) {
|
|
*pprev = handler->next;
|
|
ret = 0;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!rcu_dereference_protected(*proto_handlers(protocol),
|
|
lockdep_is_held(&xfrm6_protocol_mutex))) {
|
|
if (inet6_del_protocol(netproto(protocol), protocol) < 0) {
|
|
pr_err("%s: can't remove protocol\n", __func__);
|
|
ret = -EAGAIN;
|
|
}
|
|
}
|
|
|
|
mutex_unlock(&xfrm6_protocol_mutex);
|
|
|
|
synchronize_net();
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(xfrm6_protocol_deregister);
|
|
|
|
int __init xfrm6_protocol_init(void)
|
|
{
|
|
return xfrm_input_register_afinfo(&xfrm6_input_afinfo);
|
|
}
|
|
|
|
void xfrm6_protocol_fini(void)
|
|
{
|
|
xfrm_input_unregister_afinfo(&xfrm6_input_afinfo);
|
|
}
|