Commit 1df07fe0 authored by David S. Miller's avatar David S. Miller

Merge http://bk.skbuff.net:20608/linux-2.6-xfrm6tunnel

into nuts.davemloft.net:/disk1/BK/net-2.6
parents 29a54a41 b55ee909
......@@ -497,10 +497,6 @@ xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
return 0;
}
/* placeholder until xfrm6_tunnel.c is written */
static inline int xfrm6_tunnel_check_size(struct sk_buff *skb)
{ return 0; }
/* A struct encoding bundle of transformations to apply to some set of flow.
*
* dst->child points to the next element of bundle.
......@@ -783,6 +779,12 @@ struct xfrm_tunnel {
void (*err_handler)(struct sk_buff *skb, void *info);
};
struct xfrm6_tunnel {
int (*handler)(struct sk_buff **pskb, unsigned int *nhoffp);
void (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
int type, int code, int offset, __u32 info);
};
extern void xfrm_init(void);
extern void xfrm4_init(void);
extern void xfrm4_fini(void);
......@@ -793,6 +795,8 @@ extern void xfrm4_state_init(void);
extern void xfrm4_state_fini(void);
extern void xfrm6_state_init(void);
extern void xfrm6_state_fini(void);
extern void xfrm6_tunnel_init(void);
extern void xfrm6_tunnel_fini(void);
extern int xfrm_state_walk(u8 proto, int (*func)(struct xfrm_state *, int, void*), void *);
extern struct xfrm_state *xfrm_state_alloc(void);
......@@ -812,12 +816,18 @@ extern void xfrm_state_flush(u8 proto);
extern int xfrm_replay_check(struct xfrm_state *x, u32 seq);
extern void xfrm_replay_advance(struct xfrm_state *x, u32 seq);
extern int xfrm_check_selectors(struct xfrm_state **x, int n, struct flowi *fl);
extern int xfrm_check_output(struct xfrm_state *x, struct sk_buff *skb, unsigned short family);
extern int xfrm_state_check(struct xfrm_state *x, struct sk_buff *skb);
extern int xfrm4_rcv(struct sk_buff *skb);
extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler);
extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler);
extern int xfrm4_tunnel_check_size(struct sk_buff *skb);
extern int xfrm6_rcv(struct sk_buff **pskb, unsigned int *nhoffp);
extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler);
extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler);
extern int xfrm6_tunnel_check_size(struct sk_buff *skb);
extern u32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr);
extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr);
extern u32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr);
#ifdef CONFIG_XFRM
extern int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type);
......
......@@ -74,12 +74,15 @@ static int ah_output(struct sk_buff **pskb)
}
spin_lock_bh(&x->lock);
err = xfrm_check_output(x, *pskb, AF_INET);
err = xfrm_state_check(x, *pskb);
if (err)
goto error;
iph = (*pskb)->nh.iph;
if (x->props.mode) {
err = xfrm4_tunnel_check_size(*pskb);
if (err)
goto error;
top_iph = (struct iphdr*)skb_push(*pskb, x->props.header_len);
top_iph->ihl = 5;
top_iph->version = 4;
......
......@@ -49,19 +49,24 @@ int esp_output(struct sk_buff **pskb)
}
spin_lock_bh(&x->lock);
err = xfrm_check_output(x, *pskb, AF_INET);
err = xfrm_state_check(x, *pskb);
if (err)
goto error;
err = -ENOMEM;
/* Strip IP header in transport mode. Save it. */
if (!x->props.mode) {
if (x->props.mode) {
err = xfrm4_tunnel_check_size(*pskb);
if (err)
goto error;
} else {
/* Strip IP header in transport mode. Save it. */
iph = (*pskb)->nh.iph;
memcpy(&tmp_iph, iph, iph->ihl*4);
__skb_pull(*pskb, iph->ihl*4);
}
/* Now skb is pure payload to encrypt */
err = -ENOMEM;
/* Round to block size */
clen = (*pskb)->len;
......
......@@ -164,12 +164,16 @@ static int ipcomp_output(struct sk_buff **pskb)
}
spin_lock_bh(&x->lock);
err = xfrm_check_output(x, *pskb, AF_INET);
err = xfrm_state_check(x, *pskb);
if (err)
goto error;
/* Don't bother compressing */
if (!x->props.mode) {
if (x->props.mode) {
err = xfrm4_tunnel_check_size(*pskb);
if (err)
goto error;
} else {
/* Don't bother compressing */
iph = (*pskb)->nh.iph;
hdr_len = iph->ihl * 4;
}
......
......@@ -10,7 +10,8 @@ ipv6-objs := af_inet6.o anycast.o ip6_output.o ip6_input.o addrconf.o sit.o \
exthdrs.o sysctl_net_ipv6.o datagram.o proc.o \
ip6_flowlabel.o ipv6_syms.o
ipv6-$(CONFIG_XFRM) += xfrm6_policy.o xfrm6_state.o xfrm6_input.o
ipv6-$(CONFIG_XFRM) += xfrm6_policy.o xfrm6_state.o xfrm6_input.o \
xfrm6_tunnel.o
ipv6-objs += $(ipv6-y)
obj-$(CONFIG_INET6_AH) += ah6.o
......
......@@ -163,11 +163,15 @@ int ah6_output(struct sk_buff **pskb)
}
spin_lock_bh(&x->lock);
err = xfrm_check_output(x, *pskb, AF_INET6);
err = xfrm_state_check(x, *pskb);
if (err)
goto error;
if (x->props.mode) {
err = xfrm6_tunnel_check_size(*pskb);
if (err)
goto error;
iph = (*pskb)->nh.ipv6h;
(*pskb)->nh.ipv6h = (struct ipv6hdr*)skb_push(*pskb, x->props.header_len);
(*pskb)->nh.ipv6h->version = 6;
......
......@@ -65,14 +65,16 @@ int esp6_output(struct sk_buff **pskb)
}
spin_lock_bh(&x->lock);
err = xfrm_check_output(x, *pskb, AF_INET6);
err = xfrm_state_check(x, *pskb);
if (err)
goto error;
err = -ENOMEM;
/* Strip IP header in transport mode. Save it. */
if (!x->props.mode) {
if (x->props.mode) {
err = xfrm6_tunnel_check_size(*pskb);
if (err)
goto error;
} else {
/* Strip IP header in transport mode. Save it. */
hdr_len = ip6_find_1stfragopt(*pskb, &prevhdr);
nexthdr = *prevhdr;
*prevhdr = IPPROTO_ESP;
......@@ -86,6 +88,7 @@ int esp6_output(struct sk_buff **pskb)
}
/* Now skb is pure payload to encrypt */
err = -ENOMEM;
/* Round to block size */
clen = (*pskb)->len;
......
......@@ -123,7 +123,7 @@ static inline void ip6_tnl_dst_store(struct ip6_tnl *t, struct dst_entry *dst)
* else %NULL
**/
struct ip6_tnl *
static struct ip6_tnl *
ip6ip6_tnl_lookup(struct in6_addr *remote, struct in6_addr *local)
{
unsigned h0 = HASH(remote);
......@@ -387,8 +387,9 @@ parse_tlv_tnl_enc_lim(struct sk_buff *skb, __u8 * raw)
* to the specifications in RFC 2473.
**/
void ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
int type, int code, int offset, __u32 info)
static void
ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
int type, int code, int offset, __u32 info)
{
struct ipv6hdr *ipv6h = (struct ipv6hdr *) skb->data;
struct ip6_tnl *t;
......@@ -496,7 +497,8 @@ void ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
* Return: 0
**/
int ip6ip6_rcv(struct sk_buff **pskb, unsigned int *nhoffp)
static int
ip6ip6_rcv(struct sk_buff **pskb, unsigned int *nhoffp)
{
struct sk_buff *skb = *pskb;
struct ipv6hdr *ipv6h;
......@@ -510,6 +512,11 @@ int ip6ip6_rcv(struct sk_buff **pskb, unsigned int *nhoffp)
read_lock(&ip6ip6_lock);
if ((t = ip6ip6_tnl_lookup(&ipv6h->saddr, &ipv6h->daddr)) != NULL) {
if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
kfree_skb(skb);
return 0;
}
if (!(t->parms.flags & IP6_TNL_F_CAP_RCV)) {
t->stat.rx_dropped++;
read_unlock(&ip6ip6_lock);
......@@ -533,8 +540,7 @@ int ip6ip6_rcv(struct sk_buff **pskb, unsigned int *nhoffp)
read_unlock(&ip6ip6_lock);
icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0, skb->dev);
discard:
kfree_skb(skb);
return 0;
return 1;
}
static inline struct ipv6_txoptions *create_tel(__u8 encap_limit)
......@@ -598,7 +604,8 @@ ip6ip6_tnl_addr_conflict(struct ip6_tnl *t, struct ipv6hdr *hdr)
* 0
**/
int ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
static int
ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct ip6_tnl *t = (struct ip6_tnl *) dev->priv;
struct net_device_stats *stats = &t->stat;
......@@ -1079,7 +1086,8 @@ ip6ip6_tnl_dev_init(struct net_device *dev)
* Return: 0
**/
int ip6ip6_fb_tnl_dev_init(struct net_device *dev)
static int
ip6ip6_fb_tnl_dev_init(struct net_device *dev)
{
struct ip6_tnl *t = dev->priv;
ip6ip6_tnl_dev_init_gen(dev);
......@@ -1088,10 +1096,9 @@ int ip6ip6_fb_tnl_dev_init(struct net_device *dev)
return 0;
}
static struct inet6_protocol ip6ip6_protocol = {
static struct xfrm6_tunnel ip6ip6_handler = {
.handler = ip6ip6_rcv,
.err_handler = ip6ip6_err,
.flags = INET6_PROTO_FINAL
};
/**
......@@ -1104,9 +1111,9 @@ static int __init ip6_tunnel_init(void)
{
int err;
if ((err = inet6_add_protocol(&ip6ip6_protocol, IPPROTO_IPV6)) < 0) {
printk(KERN_ERR "Failed to register IPv6 protocol\n");
return err;
if (xfrm6_tunnel_register(&ip6ip6_handler) < 0) {
printk(KERN_ERR "ip6ip6 init: can't register tunnel\n");
return -EAGAIN;
}
ip6ip6_fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0",
ip6ip6_tnl_dev_setup);
......@@ -1123,7 +1130,7 @@ static int __init ip6_tunnel_init(void)
}
return 0;
fail:
inet6_del_protocol(&ip6ip6_protocol, IPPROTO_IPV6);
xfrm6_tunnel_deregister(&ip6ip6_handler);
return err;
}
......@@ -1133,8 +1140,10 @@ static int __init ip6_tunnel_init(void)
static void __exit ip6_tunnel_cleanup(void)
{
if (xfrm6_tunnel_deregister(&ip6ip6_handler) < 0)
printk(KERN_INFO "ip6ip6 close: can't deregister tunnel\n");
unregister_netdev(ip6ip6_fb_tnl_dev);
inet6_del_protocol(&ip6ip6_protocol, IPPROTO_IPV6);
}
module_init(ip6_tunnel_init);
......
......@@ -140,11 +140,15 @@ static int ipcomp6_output(struct sk_buff **pskb)
spin_lock_bh(&x->lock);
err = xfrm_check_output(x, *pskb, AF_INET6);
err = xfrm_state_check(x, *pskb);
if (err)
goto error;
if (x->props.mode) {
err = xfrm6_tunnel_check_size(*pskb);
if (err)
goto error;
hdr_len = sizeof(struct ipv6hdr);
nexthdr = IPPROTO_IPV6;
iph = (*pskb)->nh.ipv6h;
......@@ -258,6 +262,66 @@ static void ipcomp6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
xfrm_state_put(x);
}
static struct xfrm_state *ipcomp6_tunnel_create(struct xfrm_state *x)
{
struct xfrm_state *t = NULL;
t = xfrm_state_alloc();
if (!t)
goto out;
t->id.proto = IPPROTO_IPV6;
t->id.spi = xfrm6_tunnel_alloc_spi((xfrm_address_t *)&x->props.saddr);
memcpy(t->id.daddr.a6, x->id.daddr.a6, sizeof(struct in6_addr));
memcpy(&t->sel, &x->sel, sizeof(t->sel));
t->props.family = AF_INET6;
t->props.mode = 1;
memcpy(t->props.saddr.a6, x->props.saddr.a6, sizeof(struct in6_addr));
t->type = xfrm_get_type(IPPROTO_IPV6, t->props.family);
if (t->type == NULL)
goto error;
if (t->type->init_state(t, NULL))
goto error;
t->km.state = XFRM_STATE_VALID;
atomic_set(&t->tunnel_users, 1);
out:
return t;
error:
xfrm_state_put(t);
goto out;
}
static int ipcomp6_tunnel_attach(struct xfrm_state *x)
{
int err = 0;
struct xfrm_state *t = NULL;
u32 spi;
spi = xfrm6_tunnel_spi_lookup((xfrm_address_t *)&x->props.saddr);
if (spi)
t = xfrm_state_lookup((xfrm_address_t *)&x->id.daddr,
spi, IPPROTO_IPV6, AF_INET6);
if (!t) {
t = ipcomp6_tunnel_create(x);
if (!t) {
err = -EINVAL;
goto out;
}
xfrm_state_insert(t);
xfrm_state_hold(t);
}
x->tunnel = t;
atomic_inc(&t->tunnel_users);
out:
return err;
}
static void ipcomp6_free_data(struct ipcomp_data *ipcd)
{
if (ipcd->tfm)
......@@ -271,8 +335,11 @@ static void ipcomp6_destroy(struct xfrm_state *x)
struct ipcomp_data *ipcd = x->data;
if (!ipcd)
return;
xfrm_state_delete_tunnel(x);
ipcomp6_free_data(ipcd);
kfree(ipcd);
xfrm6_tunnel_free_spi((xfrm_address_t *)&x->props.saddr);
}
static int ipcomp6_init_state(struct xfrm_state *x, void *args)
......@@ -303,6 +370,12 @@ static int ipcomp6_init_state(struct xfrm_state *x, void *args)
if (!ipcd->tfm)
goto error;
if (x->props.mode) {
err = ipcomp6_tunnel_attach(x);
if (err)
goto error;
}
calg_desc = xfrm_calg_get_byname(x->calg->alg_name);
BUG_ON(!calg_desc);
ipcd->threshold = calg_desc->uinfo.comp.threshold;
......
......@@ -277,10 +277,12 @@ void __init xfrm6_init(void)
{
xfrm6_policy_init();
xfrm6_state_init();
xfrm6_tunnel_init();
}
void __exit xfrm6_fini(void)
{
xfrm6_tunnel_fini();
//xfrm6_input_fini();
xfrm6_policy_fini();
xfrm6_state_fini();
......
/*
* Copyright (C)2003,2004 USAGI/WIDE Project
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Authors Mitsuru KANDA <mk@linux-ipv6.org>
* YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
*
* Based on net/ipv4/xfrm4_tunnel.c
*
*/
#include <linux/config.h>
#include <linux/module.h>
#include <linux/xfrm.h>
#include <linux/list.h>
#include <net/ip.h>
#include <net/xfrm.h>
#include <net/icmp.h>
#include <net/ipv6.h>
#include <linux/ipv6.h>
#include <linux/icmpv6.h>
#ifdef CONFIG_IPV6_XFRM6_TUNNEL_DEBUG
# define X6TDEBUG 3
#else
# define X6TDEBUG 1
#endif
#define X6TPRINTK(fmt, args...) printk(fmt, ## args)
#define X6TNOPRINTK(fmt, args...) do { ; } while(0)
#if X6TDEBUG >= 1
# define X6TPRINTK1 X6TPRINTK
#else
# define X6TPRINTK1 X6TNOPRINTK
#endif
#if X6TDEBUG >= 3
# define X6TPRINTK3 X6TPRINTK
#else
# define X6TPRINTK3 X6TNOPRINTK
#endif
/*
* xfrm_tunnel_spi things are for allocating unique id ("spi")
* per xfrm_address_t.
*/
struct xfrm6_tunnel_spi {
struct hlist_node list_byaddr;
struct hlist_node list_byspi;
xfrm_address_t addr;
u32 spi;
atomic_t refcnt;
#ifdef XFRM6_TUNNEL_SPI_MAGIC
u32 magic;
#endif
};
#ifdef CONFIG_IPV6_XFRM6_TUNNEL_DEBUG
# define XFRM6_TUNNEL_SPI_MAGIC 0xdeadbeef
#endif
static rwlock_t xfrm6_tunnel_spi_lock = RW_LOCK_UNLOCKED;
static u32 xfrm6_tunnel_spi;
#define XFRM6_TUNNEL_SPI_MIN 1
#define XFRM6_TUNNEL_SPI_MAX 0xffffffff
static kmem_cache_t *xfrm6_tunnel_spi_kmem;
#define XFRM6_TUNNEL_SPI_BYADDR_HSIZE 256
#define XFRM6_TUNNEL_SPI_BYSPI_HSIZE 256
static struct hlist_head xfrm6_tunnel_spi_byaddr[XFRM6_TUNNEL_SPI_BYADDR_HSIZE];
static struct hlist_head xfrm6_tunnel_spi_byspi[XFRM6_TUNNEL_SPI_BYSPI_HSIZE];
#ifdef XFRM6_TUNNEL_SPI_MAGIC
static int x6spi_check_magic(const struct xfrm6_tunnel_spi *x6spi,
const char *name)
{
if (unlikely(x6spi->magic != XFRM6_TUNNEL_SPI_MAGIC)) {
X6TPRINTK3(KERN_DEBUG "%s(): x6spi object "
"at %p has corrupted magic %08x "
"(should be %08x)\n",
name, x6spi, x6spi->magic, XFRM6_TUNNEL_SPI_MAGIC);
return -1;
}
return 0;
}
#else
static int inline x6spi_check_magic(const struct xfrm6_tunnel_spi *x6spi,
const char *name)
{
return 0;
}
#endif
#define X6SPI_CHECK_MAGIC(x6spi) x6spi_check_magic((x6spi), __FUNCTION__)
static unsigned inline xfrm6_tunnel_spi_hash_byaddr(xfrm_address_t *addr)
{
unsigned h;
X6TPRINTK3(KERN_DEBUG "%s(addr=%p)\n", __FUNCTION__, addr);
h = addr->a6[0] ^ addr->a6[1] ^ addr->a6[2] ^ addr->a6[3];
h ^= h >> 16;
h ^= h >> 8;
h &= XFRM6_TUNNEL_SPI_BYADDR_HSIZE - 1;
X6TPRINTK3(KERN_DEBUG "%s() = %u\n", __FUNCTION__, h);
return h;
}
static unsigned inline xfrm6_tunnel_spi_hash_byspi(u32 spi)
{
return spi % XFRM6_TUNNEL_SPI_BYSPI_HSIZE;
}
static int xfrm6_tunnel_spi_init(void)
{
int i;
X6TPRINTK3(KERN_DEBUG "%s()\n", __FUNCTION__);
xfrm6_tunnel_spi = 0;
xfrm6_tunnel_spi_kmem = kmem_cache_create("xfrm6_tunnel_spi",
sizeof(struct xfrm6_tunnel_spi),
0, SLAB_HWCACHE_ALIGN,
NULL, NULL);
if (!xfrm6_tunnel_spi_kmem) {
X6TPRINTK1(KERN_ERR
"%s(): failed to allocate xfrm6_tunnel_spi_kmem\n",
__FUNCTION__);
return -ENOMEM;
}
for (i = 0; i < XFRM6_TUNNEL_SPI_BYADDR_HSIZE; i++)
INIT_HLIST_HEAD(&xfrm6_tunnel_spi_byaddr[i]);
for (i = 0; i < XFRM6_TUNNEL_SPI_BYSPI_HSIZE; i++)
INIT_HLIST_HEAD(&xfrm6_tunnel_spi_byspi[i]);
return 0;
}
static void xfrm6_tunnel_spi_fini(void)
{
int i;
X6TPRINTK3(KERN_DEBUG "%s()\n", __FUNCTION__);
for (i = 0; i < XFRM6_TUNNEL_SPI_BYADDR_HSIZE; i++) {
if (!hlist_empty(&xfrm6_tunnel_spi_byaddr[i]))
goto err;
}
for (i = 0; i < XFRM6_TUNNEL_SPI_BYSPI_HSIZE; i++) {
if (!hlist_empty(&xfrm6_tunnel_spi_byspi[i]))
goto err;
}
kmem_cache_destroy(xfrm6_tunnel_spi_kmem);
xfrm6_tunnel_spi_kmem = NULL;
return;
err:
X6TPRINTK1(KERN_ERR "%s(): table is not empty\n", __FUNCTION__);
return;
}
static struct xfrm6_tunnel_spi *__xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr)
{
struct xfrm6_tunnel_spi *x6spi;
struct hlist_node *pos;
X6TPRINTK3(KERN_DEBUG "%s(saddr=%p)\n", __FUNCTION__, saddr);
hlist_for_each_entry(x6spi, pos,
&xfrm6_tunnel_spi_byaddr[xfrm6_tunnel_spi_hash_byaddr(saddr)],
list_byaddr) {
if (memcmp(&x6spi->addr, saddr, sizeof(x6spi->addr)) == 0) {
X6SPI_CHECK_MAGIC(x6spi);
X6TPRINTK3(KERN_DEBUG "%s() = %p(%u)\n", __FUNCTION__, x6spi, x6spi->spi);
return x6spi;
}
}
X6TPRINTK3(KERN_DEBUG "%s() = NULL(0)\n", __FUNCTION__);
return NULL;
}
u32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr)
{
struct xfrm6_tunnel_spi *x6spi;
u32 spi;
X6TPRINTK3(KERN_DEBUG "%s(saddr=%p)\n", __FUNCTION__, saddr);
read_lock_bh(&xfrm6_tunnel_spi_lock);
x6spi = __xfrm6_tunnel_spi_lookup(saddr);
spi = x6spi ? x6spi->spi : 0;
read_unlock_bh(&xfrm6_tunnel_spi_lock);
return spi;
}
static u32 __xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr)
{
u32 spi;
struct xfrm6_tunnel_spi *x6spi;
struct hlist_node *pos;
unsigned index;
X6TPRINTK3(KERN_DEBUG "%s(saddr=%p)\n", __FUNCTION__, saddr);
if (xfrm6_tunnel_spi < XFRM6_TUNNEL_SPI_MIN ||
xfrm6_tunnel_spi >= XFRM6_TUNNEL_SPI_MAX)
xfrm6_tunnel_spi = XFRM6_TUNNEL_SPI_MIN;
else
xfrm6_tunnel_spi++;
for (spi = xfrm6_tunnel_spi; spi <= XFRM6_TUNNEL_SPI_MAX; spi++) {
index = xfrm6_tunnel_spi_hash_byspi(spi);
hlist_for_each_entry(x6spi, pos,
&xfrm6_tunnel_spi_byspi[index],
list_byspi) {
if (x6spi->spi == spi)
goto try_next_1;
}
xfrm6_tunnel_spi = spi;
goto alloc_spi;
try_next_1:;
}
for (spi = XFRM6_TUNNEL_SPI_MIN; spi < xfrm6_tunnel_spi; spi++) {
index = xfrm6_tunnel_spi_hash_byspi(spi);
hlist_for_each_entry(x6spi, pos,
&xfrm6_tunnel_spi_byspi[index],
list_byspi) {
if (x6spi->spi == spi)
goto try_next_2;
}
xfrm6_tunnel_spi = spi;
goto alloc_spi;
try_next_2:;
}
spi = 0;
goto out;
alloc_spi:
X6TPRINTK3(KERN_DEBUG "%s(): allocate new spi for "
"%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
__FUNCTION__,
NIP6(*(struct in6_addr *)saddr));
x6spi = kmem_cache_alloc(xfrm6_tunnel_spi_kmem, SLAB_ATOMIC);
if (!x6spi) {
X6TPRINTK1(KERN_ERR "%s(): kmem_cache_alloc() failed\n",
__FUNCTION__);
goto out;
}
#ifdef XFRM6_TUNNEL_SPI_MAGIC
x6spi->magic = XFRM6_TUNNEL_SPI_MAGIC;
#endif
memcpy(&x6spi->addr, saddr, sizeof(x6spi->addr));
x6spi->spi = spi;
atomic_set(&x6spi->refcnt, 1);
hlist_add_head(&x6spi->list_byspi, &xfrm6_tunnel_spi_byspi[index]);
index = xfrm6_tunnel_spi_hash_byaddr(saddr);
hlist_add_head(&x6spi->list_byaddr, &xfrm6_tunnel_spi_byaddr[index]);
X6SPI_CHECK_MAGIC(x6spi);
out:
X6TPRINTK3(KERN_DEBUG "%s() = %u\n", __FUNCTION__, spi);
return spi;
}
u32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr)
{
struct xfrm6_tunnel_spi *x6spi;
u32 spi;
X6TPRINTK3(KERN_DEBUG "%s(saddr=%p)\n", __FUNCTION__, saddr);
write_lock_bh(&xfrm6_tunnel_spi_lock);
x6spi = __xfrm6_tunnel_spi_lookup(saddr);
if (x6spi) {
atomic_inc(&x6spi->refcnt);
spi = x6spi->spi;
} else
spi = __xfrm6_tunnel_alloc_spi(saddr);
write_unlock_bh(&xfrm6_tunnel_spi_lock);
X6TPRINTK3(KERN_DEBUG "%s() = %u\n", __FUNCTION__, spi);
return spi;
}
void xfrm6_tunnel_free_spi(xfrm_address_t *saddr)
{
struct xfrm6_tunnel_spi *x6spi;
struct hlist_node *pos, *n;
X6TPRINTK3(KERN_DEBUG "%s(saddr=%p)\n", __FUNCTION__, saddr);
write_lock_bh(&xfrm6_tunnel_spi_lock);
hlist_for_each_entry_safe(x6spi, pos, n,
&xfrm6_tunnel_spi_byaddr[xfrm6_tunnel_spi_hash_byaddr(saddr)],
list_byaddr)
{
if (memcmp(&x6spi->addr, saddr, sizeof(x6spi->addr)) == 0) {
X6TPRINTK3(KERN_DEBUG "%s(): x6spi object "
"for %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x "
"found at %p\n",
__FUNCTION__,
NIP6(*(struct in6_addr *)saddr),
x6spi);
X6SPI_CHECK_MAGIC(x6spi);
if (atomic_dec_and_test(&x6spi->refcnt)) {
hlist_del(&x6spi->list_byaddr);
hlist_del(&x6spi->list_byspi);
kmem_cache_free(xfrm6_tunnel_spi_kmem, x6spi);
break;
}
}
}
write_unlock_bh(&xfrm6_tunnel_spi_lock);
}
int xfrm6_tunnel_check_size(struct sk_buff *skb)
{
int mtu, ret = 0;
struct dst_entry *dst = skb->dst;
mtu = dst_pmtu(dst) - sizeof(struct ipv6hdr);
if (mtu < IPV6_MIN_MTU)
mtu = IPV6_MIN_MTU;
if (skb->len > mtu) {
icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, skb->dev);
ret = -EMSGSIZE;
}
return ret;
}
static int xfrm6_tunnel_output(struct sk_buff **pskb)
{
struct sk_buff *skb = *pskb;
struct dst_entry *dst = skb->dst;
struct xfrm_state *x = dst->xfrm;
struct ipv6hdr *iph, *top_iph;
int err;
if ((err = xfrm6_tunnel_check_size(skb)) != 0)
goto error_nolock;
iph = skb->nh.ipv6h;
top_iph = (struct ipv6hdr *)skb_push(skb, x->props.header_len);
top_iph->version = 6;
top_iph->priority = iph->priority;
top_iph->flow_lbl[0] = iph->flow_lbl[0];
top_iph->flow_lbl[1] = iph->flow_lbl[1];
top_iph->flow_lbl[2] = iph->flow_lbl[2];
top_iph->nexthdr = IPPROTO_IPV6;
top_iph->payload_len = htons(skb->len - sizeof(struct ipv6hdr));
top_iph->hop_limit = iph->hop_limit;
memcpy(&top_iph->saddr, (struct in6_addr *)&x->props.saddr, sizeof(struct in6_addr));
memcpy(&top_iph->daddr, (struct in6_addr *)&x->id.daddr, sizeof(struct in6_addr));
skb->nh.raw = skb->data;
skb->h.raw = skb->nh.raw + sizeof(struct ipv6hdr);
x->curlft.bytes += skb->len;
x->curlft.packets++;
spin_unlock_bh(&x->lock);
if ((skb->dst = dst_pop(dst)) == NULL) {
kfree_skb(skb);
err = -EHOSTUNREACH;
goto error_nolock;
}
return NET_XMIT_BYPASS;
error_nolock:
kfree_skb(skb);
return err;
}
static int xfrm6_tunnel_input(struct xfrm_state *x, struct xfrm_decap_state *decap, struct sk_buff *skb)
{
if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
return -EINVAL;
skb->mac.raw = skb->nh.raw;
skb->nh.raw = skb->data;
dst_release(skb->dst);
skb->dst = NULL;
skb->protocol = htons(ETH_P_IPV6);
skb->pkt_type = PACKET_HOST;
netif_rx(skb);
return 0;
}
static struct xfrm6_tunnel *xfrm6_tunnel_handler;
static DECLARE_MUTEX(xfrm6_tunnel_sem);
int xfrm6_tunnel_register(struct xfrm6_tunnel *handler)
{
int ret;
down(&xfrm6_tunnel_sem);
ret = 0;
if (xfrm6_tunnel_handler != NULL)
ret = -EINVAL;
if (!ret)
xfrm6_tunnel_handler = handler;
up(&xfrm6_tunnel_sem);
return ret;
}
int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler)
{
int ret;
down(&xfrm6_tunnel_sem);
ret = 0;
if (xfrm6_tunnel_handler != handler)
ret = -EINVAL;
if (!ret)
xfrm6_tunnel_handler = NULL;
up(&xfrm6_tunnel_sem);
synchronize_net();
return ret;
}
static int xfrm6_tunnel_rcv(struct sk_buff **pskb, unsigned int *nhoffp)
{
struct sk_buff *skb = *pskb;
struct xfrm6_tunnel *handler = xfrm6_tunnel_handler;
struct xfrm_state *x = NULL;
struct ipv6hdr *iph = skb->nh.ipv6h;
int err = 0;
u32 spi;
/* device-like_ip6ip6_handler() */
if (handler) {
err = handler->handler(pskb, nhoffp);
if (!err)
goto out;
}
spi = xfrm6_tunnel_spi_lookup((xfrm_address_t *)&iph->saddr);
x = xfrm_state_lookup((xfrm_address_t *)&iph->daddr,
spi,
IPPROTO_IPV6, AF_INET6);
if (!x)
goto drop;
spin_lock(&x->lock);
if (unlikely(x->km.state != XFRM_STATE_VALID))
goto drop_unlock;
err = xfrm6_tunnel_input(x, NULL, skb);
if (err)
goto drop_unlock;
x->curlft.bytes += skb->len;
x->curlft.packets++;
spin_unlock(&x->lock);
xfrm_state_put(x);
out:
return 0;
drop_unlock:
spin_unlock(&x->lock);
xfrm_state_put(x);
drop:
kfree_skb(skb);
return -1;
}
static void xfrm6_tunnel_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
int type, int code, int offset, __u32 info)
{
struct xfrm6_tunnel *handler = xfrm6_tunnel_handler;
/* call here first for device-like ip6ip6 err handling */
if (handler) {
handler->err_handler(skb, opt, type, code, offset, info);
return;
}
/* xfrm6_tunnel native err handling */
switch (type) {
case ICMPV6_DEST_UNREACH:
switch (code) {
case ICMPV6_NOROUTE:
case ICMPV6_ADM_PROHIBITED:
case ICMPV6_NOT_NEIGHBOUR:
case ICMPV6_ADDR_UNREACH:
case ICMPV6_PORT_UNREACH:
default:
X6TPRINTK3(KERN_DEBUG
"xfrm6_tunnel: Destination Unreach.\n");
break;
}
break;
case ICMPV6_PKT_TOOBIG:
X6TPRINTK3(KERN_DEBUG
"xfrm6_tunnel: Packet Too Big.\n");
break;
case ICMPV6_TIME_EXCEED:
switch (code) {
case ICMPV6_EXC_HOPLIMIT:
X6TPRINTK3(KERN_DEBUG
"xfrm6_tunnel: Too small Hoplimit.\n");
break;
case ICMPV6_EXC_FRAGTIME:
default:
break;
}
break;
case ICMPV6_PARAMPROB:
switch (code) {
case ICMPV6_HDR_FIELD: break;
case ICMPV6_UNK_NEXTHDR: break;
case ICMPV6_UNK_OPTION: break;
}
break;
default:
break;
}
return;
}
static int xfrm6_tunnel_init_state(struct xfrm_state *x, void *args)
{
if (!x->props.mode)
return -EINVAL;
x->props.header_len = sizeof(struct ipv6hdr);
return 0;
}
static void xfrm6_tunnel_destroy(struct xfrm_state *x)
{
xfrm6_tunnel_free_spi((xfrm_address_t *)&x->props.saddr);
}
static struct xfrm_type xfrm6_tunnel_type = {
.description = "IP6IP6",
.owner = THIS_MODULE,
.proto = IPPROTO_IPV6,
.init_state = xfrm6_tunnel_init_state,
.destructor = xfrm6_tunnel_destroy,
.input = xfrm6_tunnel_input,
.output = xfrm6_tunnel_output,
};
static struct inet6_protocol xfrm6_tunnel_protocol = {
.handler = xfrm6_tunnel_rcv,
.err_handler = xfrm6_tunnel_err,
.flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
};
void __init xfrm6_tunnel_init(void)
{
X6TPRINTK3(KERN_DEBUG "%s()\n", __FUNCTION__);
if (xfrm_register_type(&xfrm6_tunnel_type, AF_INET6) < 0) {
X6TPRINTK1(KERN_ERR
"xfrm6_tunnel init: can't add xfrm type\n");
return;
}
if (inet6_add_protocol(&xfrm6_tunnel_protocol, IPPROTO_IPV6) < 0) {
X6TPRINTK1(KERN_ERR
"xfrm6_tunnel init(): can't add protocol\n");
xfrm_unregister_type(&xfrm6_tunnel_type, AF_INET6);
return;
}
if (xfrm6_tunnel_spi_init() < 0) {
X6TPRINTK1(KERN_ERR
"xfrm6_tunnel init: failed to initialize spi\n");
inet6_del_protocol(&xfrm6_tunnel_protocol, IPPROTO_IPV6);
xfrm_unregister_type(&xfrm6_tunnel_type, AF_INET6);
return;
}
}
void __exit xfrm6_tunnel_fini(void)
{
X6TPRINTK3(KERN_DEBUG "%s()\n", __FUNCTION__);
xfrm6_tunnel_spi_fini();
if (inet6_del_protocol(&xfrm6_tunnel_protocol, IPPROTO_IPV6) < 0)
X6TPRINTK1(KERN_ERR
"xfrm6_tunnel close: can't remove protocol\n");
if (xfrm_unregister_type(&xfrm6_tunnel_type, AF_INET6) < 0)
X6TPRINTK1(KERN_ERR
"xfrm6_tunnel close: can't remove xfrm type\n");
}
......@@ -2,7 +2,7 @@
# Makefile for the XFRM subsystem.
#
obj-$(CONFIG_XFRM) := xfrm_policy.o xfrm_state.o xfrm_input.o xfrm_algo.o xfrm_output.o \
obj-$(CONFIG_XFRM) := xfrm_policy.o xfrm_state.o xfrm_input.o xfrm_algo.o \
xfrm_export.o
obj-$(CONFIG_XFRM_USER) += xfrm_user.o
......@@ -18,6 +18,7 @@ EXPORT_SYMBOL(xfrm_state_add);
EXPORT_SYMBOL(xfrm_state_update);
EXPORT_SYMBOL(xfrm_state_check_expire);
EXPORT_SYMBOL(xfrm_state_check_space);
EXPORT_SYMBOL(xfrm_state_check);
EXPORT_SYMBOL(xfrm_state_lookup);
EXPORT_SYMBOL(xfrm_state_register_afinfo);
EXPORT_SYMBOL(xfrm_state_unregister_afinfo);
......@@ -27,7 +28,6 @@ EXPORT_SYMBOL(xfrm_state_delete_tunnel);
EXPORT_SYMBOL(xfrm_replay_check);
EXPORT_SYMBOL(xfrm_replay_advance);
EXPORT_SYMBOL(xfrm_check_selectors);
EXPORT_SYMBOL(xfrm_check_output);
EXPORT_SYMBOL(__secpath_destroy);
EXPORT_SYMBOL(secpath_dup);
EXPORT_SYMBOL(xfrm_get_acqseq);
......
/*
* generic xfrm output routines
*
* Copyright (c) 2003 James Morris <jmorris@intercode.com.au>
*
* 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/config.h>
#include <linux/kernel.h>
#include <linux/skbuff.h>
#include <net/xfrm.h>
int xfrm_check_output(struct xfrm_state *x,
struct sk_buff *skb, unsigned short family)
{
int err;
err = xfrm_state_check_expire(x);
if (err)
goto out;
if (x->props.mode) {
switch (family) {
case AF_INET:
err = xfrm4_tunnel_check_size(skb);
break;
case AF_INET6:
err = xfrm6_tunnel_check_size(skb);
break;
default:
err = -EINVAL;
}
if (err)
goto out;
}
err = xfrm_state_check_space(x, skb);
out:
return err;
}
......@@ -531,6 +531,16 @@ int xfrm_state_check_space(struct xfrm_state *x, struct sk_buff *skb)
return 0;
}
int xfrm_state_check(struct xfrm_state *x, struct sk_buff *skb)
{
int err = xfrm_state_check_expire(x);
if (err < 0)
goto err;
err = xfrm_state_check_space(x, skb);
err:
return err;
}
struct xfrm_state *
xfrm_state_lookup(xfrm_address_t *daddr, u32 spi, u8 proto,
unsigned short family)
......
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