Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

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 00000000000..ffcadd68b95
--- /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");