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path: root/net/ipv6/xfrm6_tunnel.c
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Diffstat (limited to 'net/ipv6/xfrm6_tunnel.c')
-rw-r--r--net/ipv6/xfrm6_tunnel.c543
1 files changed, 543 insertions, 0 deletions
diff --git a/net/ipv6/xfrm6_tunnel.c b/net/ipv6/xfrm6_tunnel.c
new file mode 100644
index 000000000000..ffcadd68b951
--- /dev/null
+++ b/net/ipv6/xfrm6_tunnel.c
@@ -0,0 +1,543 @@
+/*
+ * 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/ipv6.h>
+#include <net/protocol.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 DEFINE_RWLOCK(xfrm6_tunnel_spi_lock);
+
+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;
+}
+
+EXPORT_SYMBOL(xfrm6_tunnel_spi_lookup);
+
+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;
+}
+
+EXPORT_SYMBOL(xfrm6_tunnel_alloc_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);
+}
+
+EXPORT_SYMBOL(xfrm6_tunnel_free_spi);
+
+static int xfrm6_tunnel_output(struct xfrm_state *x, struct sk_buff *skb)
+{
+ struct ipv6hdr *top_iph;
+
+ top_iph = (struct ipv6hdr *)skb->data;
+ top_iph->payload_len = htons(skb->len - sizeof(struct ipv6hdr));
+
+ return 0;
+}
+
+static int xfrm6_tunnel_input(struct xfrm_state *x, struct xfrm_decap_state *decap, struct sk_buff *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;
+}
+
+EXPORT_SYMBOL(xfrm6_tunnel_register);
+
+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;
+}
+
+EXPORT_SYMBOL(xfrm6_tunnel_deregister);
+
+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 ipv6hdr *iph = skb->nh.ipv6h;
+ u32 spi;
+
+ /* device-like_ip6ip6_handler() */
+ if (handler && handler->handler(pskb, nhoffp) == 0)
+ return 0;
+
+ spi = xfrm6_tunnel_spi_lookup((xfrm_address_t *)&iph->saddr);
+ return xfrm6_rcv_spi(pskb, nhoffp, spi);
+}
+
+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;
+
+ if (x->encap)
+ 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,
+};
+
+static int __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 -EAGAIN;
+ }
+ 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 -EAGAIN;
+ }
+ 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 -EAGAIN;
+ }
+ return 0;
+}
+
+static 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");
+}
+
+module_init(xfrm6_tunnel_init);
+module_exit(xfrm6_tunnel_fini);
+MODULE_LICENSE("GPL");
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-24 07:29:43 +0000