544 строки
13 KiB
C
544 строки
13 KiB
C
/*
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* Copyright (C)2003,2004 USAGI/WIDE Project
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* Authors Mitsuru KANDA <mk@linux-ipv6.org>
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* YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
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*
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* Based on net/ipv4/xfrm4_tunnel.c
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*
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*/
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#include <linux/config.h>
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#include <linux/module.h>
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#include <linux/xfrm.h>
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#include <linux/list.h>
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#include <net/ip.h>
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#include <net/xfrm.h>
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#include <net/ipv6.h>
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#include <net/protocol.h>
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#include <linux/ipv6.h>
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#include <linux/icmpv6.h>
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#ifdef CONFIG_IPV6_XFRM6_TUNNEL_DEBUG
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# define X6TDEBUG 3
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#else
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# define X6TDEBUG 1
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#endif
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#define X6TPRINTK(fmt, args...) printk(fmt, ## args)
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#define X6TNOPRINTK(fmt, args...) do { ; } while(0)
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#if X6TDEBUG >= 1
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# define X6TPRINTK1 X6TPRINTK
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#else
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# define X6TPRINTK1 X6TNOPRINTK
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#endif
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#if X6TDEBUG >= 3
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# define X6TPRINTK3 X6TPRINTK
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#else
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# define X6TPRINTK3 X6TNOPRINTK
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#endif
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/*
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* xfrm_tunnel_spi things are for allocating unique id ("spi")
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* per xfrm_address_t.
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*/
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struct xfrm6_tunnel_spi {
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struct hlist_node list_byaddr;
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struct hlist_node list_byspi;
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xfrm_address_t addr;
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u32 spi;
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atomic_t refcnt;
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#ifdef XFRM6_TUNNEL_SPI_MAGIC
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u32 magic;
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#endif
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};
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#ifdef CONFIG_IPV6_XFRM6_TUNNEL_DEBUG
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# define XFRM6_TUNNEL_SPI_MAGIC 0xdeadbeef
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#endif
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static DEFINE_RWLOCK(xfrm6_tunnel_spi_lock);
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static u32 xfrm6_tunnel_spi;
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#define XFRM6_TUNNEL_SPI_MIN 1
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#define XFRM6_TUNNEL_SPI_MAX 0xffffffff
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static kmem_cache_t *xfrm6_tunnel_spi_kmem __read_mostly;
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#define XFRM6_TUNNEL_SPI_BYADDR_HSIZE 256
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#define XFRM6_TUNNEL_SPI_BYSPI_HSIZE 256
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static struct hlist_head xfrm6_tunnel_spi_byaddr[XFRM6_TUNNEL_SPI_BYADDR_HSIZE];
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static struct hlist_head xfrm6_tunnel_spi_byspi[XFRM6_TUNNEL_SPI_BYSPI_HSIZE];
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#ifdef XFRM6_TUNNEL_SPI_MAGIC
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static int x6spi_check_magic(const struct xfrm6_tunnel_spi *x6spi,
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const char *name)
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{
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if (unlikely(x6spi->magic != XFRM6_TUNNEL_SPI_MAGIC)) {
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X6TPRINTK3(KERN_DEBUG "%s(): x6spi object "
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"at %p has corrupted magic %08x "
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"(should be %08x)\n",
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name, x6spi, x6spi->magic, XFRM6_TUNNEL_SPI_MAGIC);
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return -1;
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}
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return 0;
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}
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#else
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static int inline x6spi_check_magic(const struct xfrm6_tunnel_spi *x6spi,
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const char *name)
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{
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return 0;
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}
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#endif
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#define X6SPI_CHECK_MAGIC(x6spi) x6spi_check_magic((x6spi), __FUNCTION__)
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static unsigned inline xfrm6_tunnel_spi_hash_byaddr(xfrm_address_t *addr)
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{
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unsigned h;
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X6TPRINTK3(KERN_DEBUG "%s(addr=%p)\n", __FUNCTION__, addr);
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h = addr->a6[0] ^ addr->a6[1] ^ addr->a6[2] ^ addr->a6[3];
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h ^= h >> 16;
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h ^= h >> 8;
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h &= XFRM6_TUNNEL_SPI_BYADDR_HSIZE - 1;
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X6TPRINTK3(KERN_DEBUG "%s() = %u\n", __FUNCTION__, h);
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return h;
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}
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static unsigned inline xfrm6_tunnel_spi_hash_byspi(u32 spi)
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{
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return spi % XFRM6_TUNNEL_SPI_BYSPI_HSIZE;
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}
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static int xfrm6_tunnel_spi_init(void)
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{
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int i;
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X6TPRINTK3(KERN_DEBUG "%s()\n", __FUNCTION__);
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xfrm6_tunnel_spi = 0;
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xfrm6_tunnel_spi_kmem = kmem_cache_create("xfrm6_tunnel_spi",
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sizeof(struct xfrm6_tunnel_spi),
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0, SLAB_HWCACHE_ALIGN,
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NULL, NULL);
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if (!xfrm6_tunnel_spi_kmem) {
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X6TPRINTK1(KERN_ERR
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"%s(): failed to allocate xfrm6_tunnel_spi_kmem\n",
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__FUNCTION__);
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return -ENOMEM;
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}
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for (i = 0; i < XFRM6_TUNNEL_SPI_BYADDR_HSIZE; i++)
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INIT_HLIST_HEAD(&xfrm6_tunnel_spi_byaddr[i]);
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for (i = 0; i < XFRM6_TUNNEL_SPI_BYSPI_HSIZE; i++)
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INIT_HLIST_HEAD(&xfrm6_tunnel_spi_byspi[i]);
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return 0;
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}
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static void xfrm6_tunnel_spi_fini(void)
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{
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int i;
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X6TPRINTK3(KERN_DEBUG "%s()\n", __FUNCTION__);
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for (i = 0; i < XFRM6_TUNNEL_SPI_BYADDR_HSIZE; i++) {
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if (!hlist_empty(&xfrm6_tunnel_spi_byaddr[i]))
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goto err;
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}
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for (i = 0; i < XFRM6_TUNNEL_SPI_BYSPI_HSIZE; i++) {
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if (!hlist_empty(&xfrm6_tunnel_spi_byspi[i]))
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goto err;
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}
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kmem_cache_destroy(xfrm6_tunnel_spi_kmem);
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xfrm6_tunnel_spi_kmem = NULL;
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return;
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err:
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X6TPRINTK1(KERN_ERR "%s(): table is not empty\n", __FUNCTION__);
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return;
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}
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static struct xfrm6_tunnel_spi *__xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr)
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{
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struct xfrm6_tunnel_spi *x6spi;
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struct hlist_node *pos;
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X6TPRINTK3(KERN_DEBUG "%s(saddr=%p)\n", __FUNCTION__, saddr);
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hlist_for_each_entry(x6spi, pos,
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&xfrm6_tunnel_spi_byaddr[xfrm6_tunnel_spi_hash_byaddr(saddr)],
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list_byaddr) {
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if (memcmp(&x6spi->addr, saddr, sizeof(x6spi->addr)) == 0) {
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X6SPI_CHECK_MAGIC(x6spi);
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X6TPRINTK3(KERN_DEBUG "%s() = %p(%u)\n", __FUNCTION__, x6spi, x6spi->spi);
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return x6spi;
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}
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}
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X6TPRINTK3(KERN_DEBUG "%s() = NULL(0)\n", __FUNCTION__);
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return NULL;
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}
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u32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr)
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{
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struct xfrm6_tunnel_spi *x6spi;
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u32 spi;
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X6TPRINTK3(KERN_DEBUG "%s(saddr=%p)\n", __FUNCTION__, saddr);
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read_lock_bh(&xfrm6_tunnel_spi_lock);
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x6spi = __xfrm6_tunnel_spi_lookup(saddr);
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spi = x6spi ? x6spi->spi : 0;
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read_unlock_bh(&xfrm6_tunnel_spi_lock);
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return spi;
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}
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EXPORT_SYMBOL(xfrm6_tunnel_spi_lookup);
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static u32 __xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr)
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{
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u32 spi;
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struct xfrm6_tunnel_spi *x6spi;
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struct hlist_node *pos;
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unsigned index;
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X6TPRINTK3(KERN_DEBUG "%s(saddr=%p)\n", __FUNCTION__, saddr);
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if (xfrm6_tunnel_spi < XFRM6_TUNNEL_SPI_MIN ||
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xfrm6_tunnel_spi >= XFRM6_TUNNEL_SPI_MAX)
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xfrm6_tunnel_spi = XFRM6_TUNNEL_SPI_MIN;
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else
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xfrm6_tunnel_spi++;
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for (spi = xfrm6_tunnel_spi; spi <= XFRM6_TUNNEL_SPI_MAX; spi++) {
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index = xfrm6_tunnel_spi_hash_byspi(spi);
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hlist_for_each_entry(x6spi, pos,
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&xfrm6_tunnel_spi_byspi[index],
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list_byspi) {
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if (x6spi->spi == spi)
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goto try_next_1;
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}
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xfrm6_tunnel_spi = spi;
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goto alloc_spi;
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try_next_1:;
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}
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for (spi = XFRM6_TUNNEL_SPI_MIN; spi < xfrm6_tunnel_spi; spi++) {
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index = xfrm6_tunnel_spi_hash_byspi(spi);
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hlist_for_each_entry(x6spi, pos,
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&xfrm6_tunnel_spi_byspi[index],
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list_byspi) {
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if (x6spi->spi == spi)
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goto try_next_2;
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}
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xfrm6_tunnel_spi = spi;
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goto alloc_spi;
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try_next_2:;
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}
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spi = 0;
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goto out;
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alloc_spi:
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X6TPRINTK3(KERN_DEBUG "%s(): allocate new spi for "
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"%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
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__FUNCTION__,
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NIP6(*(struct in6_addr *)saddr));
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x6spi = kmem_cache_alloc(xfrm6_tunnel_spi_kmem, SLAB_ATOMIC);
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if (!x6spi) {
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X6TPRINTK1(KERN_ERR "%s(): kmem_cache_alloc() failed\n",
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__FUNCTION__);
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goto out;
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}
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#ifdef XFRM6_TUNNEL_SPI_MAGIC
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x6spi->magic = XFRM6_TUNNEL_SPI_MAGIC;
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#endif
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memcpy(&x6spi->addr, saddr, sizeof(x6spi->addr));
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x6spi->spi = spi;
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atomic_set(&x6spi->refcnt, 1);
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hlist_add_head(&x6spi->list_byspi, &xfrm6_tunnel_spi_byspi[index]);
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index = xfrm6_tunnel_spi_hash_byaddr(saddr);
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hlist_add_head(&x6spi->list_byaddr, &xfrm6_tunnel_spi_byaddr[index]);
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X6SPI_CHECK_MAGIC(x6spi);
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out:
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X6TPRINTK3(KERN_DEBUG "%s() = %u\n", __FUNCTION__, spi);
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return spi;
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}
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u32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr)
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{
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struct xfrm6_tunnel_spi *x6spi;
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u32 spi;
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X6TPRINTK3(KERN_DEBUG "%s(saddr=%p)\n", __FUNCTION__, saddr);
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write_lock_bh(&xfrm6_tunnel_spi_lock);
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x6spi = __xfrm6_tunnel_spi_lookup(saddr);
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if (x6spi) {
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atomic_inc(&x6spi->refcnt);
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spi = x6spi->spi;
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} else
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spi = __xfrm6_tunnel_alloc_spi(saddr);
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write_unlock_bh(&xfrm6_tunnel_spi_lock);
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X6TPRINTK3(KERN_DEBUG "%s() = %u\n", __FUNCTION__, spi);
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return spi;
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}
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EXPORT_SYMBOL(xfrm6_tunnel_alloc_spi);
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void xfrm6_tunnel_free_spi(xfrm_address_t *saddr)
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{
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struct xfrm6_tunnel_spi *x6spi;
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struct hlist_node *pos, *n;
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X6TPRINTK3(KERN_DEBUG "%s(saddr=%p)\n", __FUNCTION__, saddr);
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write_lock_bh(&xfrm6_tunnel_spi_lock);
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hlist_for_each_entry_safe(x6spi, pos, n,
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&xfrm6_tunnel_spi_byaddr[xfrm6_tunnel_spi_hash_byaddr(saddr)],
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list_byaddr)
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{
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if (memcmp(&x6spi->addr, saddr, sizeof(x6spi->addr)) == 0) {
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X6TPRINTK3(KERN_DEBUG "%s(): x6spi object "
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"for %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x "
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"found at %p\n",
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__FUNCTION__,
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NIP6(*(struct in6_addr *)saddr),
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x6spi);
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X6SPI_CHECK_MAGIC(x6spi);
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if (atomic_dec_and_test(&x6spi->refcnt)) {
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hlist_del(&x6spi->list_byaddr);
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hlist_del(&x6spi->list_byspi);
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kmem_cache_free(xfrm6_tunnel_spi_kmem, x6spi);
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break;
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}
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}
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}
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write_unlock_bh(&xfrm6_tunnel_spi_lock);
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}
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EXPORT_SYMBOL(xfrm6_tunnel_free_spi);
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static int xfrm6_tunnel_output(struct xfrm_state *x, struct sk_buff *skb)
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{
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struct ipv6hdr *top_iph;
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top_iph = (struct ipv6hdr *)skb->data;
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top_iph->payload_len = htons(skb->len - sizeof(struct ipv6hdr));
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return 0;
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}
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static int xfrm6_tunnel_input(struct xfrm_state *x, struct xfrm_decap_state *decap, struct sk_buff *skb)
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{
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return 0;
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}
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static struct xfrm6_tunnel *xfrm6_tunnel_handler;
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static DECLARE_MUTEX(xfrm6_tunnel_sem);
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int xfrm6_tunnel_register(struct xfrm6_tunnel *handler)
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{
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int ret;
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down(&xfrm6_tunnel_sem);
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ret = 0;
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if (xfrm6_tunnel_handler != NULL)
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ret = -EINVAL;
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if (!ret)
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xfrm6_tunnel_handler = handler;
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up(&xfrm6_tunnel_sem);
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return ret;
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}
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EXPORT_SYMBOL(xfrm6_tunnel_register);
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int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler)
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{
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int ret;
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down(&xfrm6_tunnel_sem);
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ret = 0;
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if (xfrm6_tunnel_handler != handler)
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ret = -EINVAL;
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if (!ret)
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xfrm6_tunnel_handler = NULL;
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up(&xfrm6_tunnel_sem);
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synchronize_net();
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return ret;
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}
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EXPORT_SYMBOL(xfrm6_tunnel_deregister);
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static int xfrm6_tunnel_rcv(struct sk_buff **pskb, unsigned int *nhoffp)
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{
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struct sk_buff *skb = *pskb;
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struct xfrm6_tunnel *handler = xfrm6_tunnel_handler;
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struct ipv6hdr *iph = skb->nh.ipv6h;
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u32 spi;
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/* device-like_ip6ip6_handler() */
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if (handler && handler->handler(pskb, nhoffp) == 0)
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return 0;
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spi = xfrm6_tunnel_spi_lookup((xfrm_address_t *)&iph->saddr);
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return xfrm6_rcv_spi(pskb, nhoffp, spi);
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}
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static void xfrm6_tunnel_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
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int type, int code, int offset, __u32 info)
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{
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struct xfrm6_tunnel *handler = xfrm6_tunnel_handler;
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/* call here first for device-like ip6ip6 err handling */
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if (handler) {
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handler->err_handler(skb, opt, type, code, offset, info);
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return;
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}
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/* xfrm6_tunnel native err handling */
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switch (type) {
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case ICMPV6_DEST_UNREACH:
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switch (code) {
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case ICMPV6_NOROUTE:
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case ICMPV6_ADM_PROHIBITED:
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case ICMPV6_NOT_NEIGHBOUR:
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case ICMPV6_ADDR_UNREACH:
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case ICMPV6_PORT_UNREACH:
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default:
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X6TPRINTK3(KERN_DEBUG
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"xfrm6_tunnel: Destination Unreach.\n");
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break;
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}
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break;
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case ICMPV6_PKT_TOOBIG:
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X6TPRINTK3(KERN_DEBUG
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"xfrm6_tunnel: Packet Too Big.\n");
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break;
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case ICMPV6_TIME_EXCEED:
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switch (code) {
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case ICMPV6_EXC_HOPLIMIT:
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X6TPRINTK3(KERN_DEBUG
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"xfrm6_tunnel: Too small Hoplimit.\n");
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break;
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case ICMPV6_EXC_FRAGTIME:
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default:
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break;
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}
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break;
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case ICMPV6_PARAMPROB:
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switch (code) {
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case ICMPV6_HDR_FIELD: break;
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case ICMPV6_UNK_NEXTHDR: break;
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case ICMPV6_UNK_OPTION: break;
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}
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break;
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default:
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break;
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}
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return;
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}
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static int xfrm6_tunnel_init_state(struct xfrm_state *x)
|
|
{
|
|
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");
|