[XFRM]: Add XFRM_MODE_xxx for future use.
[linux-2.6.git] / net / ipv6 / xfrm6_tunnel.c
index ffcadd6..59685ee 100644 (file)
  * 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
+#include <linux/mutex.h>
 
 /*
  * xfrm_tunnel_spi things are for allocating unique id ("spi") 
@@ -63,15 +41,8 @@ struct xfrm6_tunnel_spi {
        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;
@@ -79,7 +50,7 @@ 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;
+static kmem_cache_t *xfrm6_tunnel_spi_kmem __read_mostly;
 
 #define XFRM6_TUNNEL_SPI_BYADDR_HSIZE 256
 #define XFRM6_TUNNEL_SPI_BYSPI_HSIZE 256
@@ -87,43 +58,15 @@ static kmem_cache_t *xfrm6_tunnel_spi_kmem;
 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;
 }
 
@@ -137,19 +80,13 @@ 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__);
+       if (!xfrm6_tunnel_spi_kmem)
                return -ENOMEM;
-       }
 
        for (i = 0; i < XFRM6_TUNNEL_SPI_BYADDR_HSIZE; i++)
                INIT_HLIST_HEAD(&xfrm6_tunnel_spi_byaddr[i]);
@@ -162,22 +99,16 @@ 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;
+                       return;
        }
        for (i = 0; i < XFRM6_TUNNEL_SPI_BYSPI_HSIZE; i++) {
                if (!hlist_empty(&xfrm6_tunnel_spi_byspi[i]))
-                       goto err;
+                       return;
        }
        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)
@@ -185,19 +116,13 @@ 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);
+               if (memcmp(&x6spi->addr, saddr, sizeof(x6spi->addr)) == 0)
                        return x6spi;
-               }
        }
 
-       X6TPRINTK3(KERN_DEBUG "%s() = NULL(0)\n", __FUNCTION__);
        return NULL;
 }
 
@@ -206,8 +131,6 @@ 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;
@@ -224,8 +147,6 @@ static u32 __xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr)
        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;
@@ -259,19 +180,10 @@ 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__);
+       if (!x6spi)
                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);
@@ -280,9 +192,7 @@ alloc_spi:
 
        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;
 }
 
@@ -291,8 +201,6 @@ 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) {
@@ -302,8 +210,6 @@ u32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr)
                spi = __xfrm6_tunnel_alloc_spi(saddr);
        write_unlock_bh(&xfrm6_tunnel_spi_lock);
 
-       X6TPRINTK3(KERN_DEBUG "%s() = %u\n", __FUNCTION__, spi);
-
        return spi;
 }
 
@@ -314,8 +220,6 @@ 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, 
@@ -323,13 +227,6 @@ void xfrm6_tunnel_free_spi(xfrm_address_t *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);
@@ -353,76 +250,23 @@ static int xfrm6_tunnel_output(struct xfrm_state *x, struct sk_buff *skb)
        return 0;
 }
 
-static int xfrm6_tunnel_input(struct xfrm_state *x, struct xfrm_decap_state *decap, struct sk_buff *skb)
+static int xfrm6_tunnel_input(struct xfrm_state *x, 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)
+static int xfrm6_tunnel_rcv(struct sk_buff *skb)
 {
-       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);
+       return xfrm6_rcv_spi(skb, spi);
 }
 
-static void xfrm6_tunnel_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
-                            int type, int code, int offset, __u32 info)
+static int 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: 
@@ -433,20 +277,14 @@ static void xfrm6_tunnel_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
                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: 
@@ -463,12 +301,13 @@ static void xfrm6_tunnel_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
        default:
                break;
        }
-       return;
+
+       return 0;
 }
 
-static int xfrm6_tunnel_init_state(struct xfrm_state *x, void *args)
+static int xfrm6_tunnel_init_state(struct xfrm_state *x)
 {
-       if (!x->props.mode)
+       if (x->props.mode != XFRM_MODE_TUNNEL)
                return -EINVAL;
 
        if (x->encap)
@@ -494,31 +333,23 @@ static struct xfrm_type xfrm6_tunnel_type = {
        .output         = xfrm6_tunnel_output,
 };
 
-static struct inet6_protocol xfrm6_tunnel_protocol = {
+static struct xfrm6_tunnel xfrm6_tunnel_handler = {
        .handler        = xfrm6_tunnel_rcv,
-       .err_handler    = xfrm6_tunnel_err, 
-       .flags          = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
+       .err_handler    = xfrm6_tunnel_err,
+       .priority       = 2,
 };
 
 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");
+       if (xfrm_register_type(&xfrm6_tunnel_type, AF_INET6) < 0)
                return -EAGAIN;
-       }
-       if (inet6_add_protocol(&xfrm6_tunnel_protocol, IPPROTO_IPV6) < 0) {
-               X6TPRINTK1(KERN_ERR
-                          "xfrm6_tunnel init(): can't add protocol\n");
+
+       if (xfrm6_tunnel_register(&xfrm6_tunnel_handler)) {
                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);
+               xfrm6_tunnel_deregister(&xfrm6_tunnel_handler);
                xfrm_unregister_type(&xfrm6_tunnel_type, AF_INET6);
                return -EAGAIN;
        }
@@ -527,15 +358,9 @@ static int __init xfrm6_tunnel_init(void)
 
 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");
+       xfrm6_tunnel_deregister(&xfrm6_tunnel_handler);
+       xfrm_unregister_type(&xfrm6_tunnel_type, AF_INET6);
 }
 
 module_init(xfrm6_tunnel_init);