369 lines
8.6 KiB
C
369 lines
8.6 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/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 <linux/ipv6.h>
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#include <linux/icmpv6.h>
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#include <linux/mutex.h>
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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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};
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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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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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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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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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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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return -ENOMEM;
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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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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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return;
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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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return;
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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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}
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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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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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return x6spi;
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}
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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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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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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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x6spi = kmem_cache_alloc(xfrm6_tunnel_spi_kmem, SLAB_ATOMIC);
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if (!x6spi)
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goto out;
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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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out:
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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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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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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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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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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 sk_buff *skb)
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{
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return 0;
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}
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static int xfrm6_tunnel_rcv(struct sk_buff *skb)
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{
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struct ipv6hdr *iph = skb->nh.ipv6h;
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u32 spi;
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spi = xfrm6_tunnel_spi_lookup((xfrm_address_t *)&iph->saddr);
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return xfrm6_rcv_spi(skb, spi);
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}
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static int 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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/* 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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break;
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}
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break;
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case ICMPV6_PKT_TOOBIG:
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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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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 0;
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}
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static int xfrm6_tunnel_init_state(struct xfrm_state *x)
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{
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if (x->props.mode != XFRM_MODE_TUNNEL)
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return -EINVAL;
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if (x->encap)
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return -EINVAL;
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x->props.header_len = sizeof(struct ipv6hdr);
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return 0;
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}
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static void xfrm6_tunnel_destroy(struct xfrm_state *x)
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{
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xfrm6_tunnel_free_spi((xfrm_address_t *)&x->props.saddr);
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}
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static struct xfrm_type xfrm6_tunnel_type = {
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.description = "IP6IP6",
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.owner = THIS_MODULE,
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.proto = IPPROTO_IPV6,
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.init_state = xfrm6_tunnel_init_state,
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.destructor = xfrm6_tunnel_destroy,
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.input = xfrm6_tunnel_input,
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.output = xfrm6_tunnel_output,
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};
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static struct xfrm6_tunnel xfrm6_tunnel_handler = {
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.handler = xfrm6_tunnel_rcv,
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.err_handler = xfrm6_tunnel_err,
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.priority = 2,
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};
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static int __init xfrm6_tunnel_init(void)
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{
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if (xfrm_register_type(&xfrm6_tunnel_type, AF_INET6) < 0)
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return -EAGAIN;
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if (xfrm6_tunnel_register(&xfrm6_tunnel_handler)) {
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xfrm_unregister_type(&xfrm6_tunnel_type, AF_INET6);
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return -EAGAIN;
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}
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if (xfrm6_tunnel_spi_init() < 0) {
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xfrm6_tunnel_deregister(&xfrm6_tunnel_handler);
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xfrm_unregister_type(&xfrm6_tunnel_type, AF_INET6);
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return -EAGAIN;
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}
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return 0;
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}
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static void __exit xfrm6_tunnel_fini(void)
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{
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xfrm6_tunnel_spi_fini();
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xfrm6_tunnel_deregister(&xfrm6_tunnel_handler);
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xfrm_unregister_type(&xfrm6_tunnel_type, AF_INET6);
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}
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module_init(xfrm6_tunnel_init);
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module_exit(xfrm6_tunnel_fini);
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MODULE_LICENSE("GPL");
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