X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=net%2Fipv6%2Fxfrm6_policy.c;h=8dffd4daae9ce4dbeb3ab8a7cc1f9887f495b669;hb=refs%2Fheads%2Fvserver;hp=a0715e2f05d77b397a94abd85c6a5858538c6cc4;hpb=c7b5ebbddf7bcd3651947760f423e3783bbe6573;p=linux-2.6.git

diff --git a/net/ipv6/xfrm6_policy.c b/net/ipv6/xfrm6_policy.c
index a0715e2f0..8dffd4daa 100644
--- a/net/ipv6/xfrm6_policy.c
+++ b/net/ipv6/xfrm6_policy.c
@@ -11,44 +11,49 @@
  * 
  */
 
-#include <linux/config.h>
+#include <linux/compiler.h>
+#include <linux/netdevice.h>
+#include <net/addrconf.h>
 #include <net/xfrm.h>
 #include <net/ip.h>
 #include <net/ipv6.h>
 #include <net/ip6_route.h>
+#ifdef CONFIG_IPV6_MIP6
+#include <net/mip6.h>
+#endif
 
 static struct dst_ops xfrm6_dst_ops;
 static struct xfrm_policy_afinfo xfrm6_policy_afinfo;
 
-static struct xfrm_type_map xfrm6_type_map = { .lock = RW_LOCK_UNLOCKED };
-
-static int xfrm6_dst_lookup(struct xfrm_dst **dst, struct flowi *fl)
+static int xfrm6_dst_lookup(struct xfrm_dst **xdst, struct flowi *fl)
 {
-	int err = 0;
-	*dst = (struct xfrm_dst*)ip6_route_output(NULL, fl);
-	if (!*dst)
-		err = -ENETUNREACH;
+	struct dst_entry *dst = ip6_route_output(NULL, fl);
+	int err = dst->error;
+	if (!err)
+		*xdst = (struct xfrm_dst *) dst;
+	else
+		dst_release(dst);
 	return err;
 }
 
-/* Check that the bundle accepts the flow and its components are
- * still valid.
- */
-
-static int __xfrm6_bundle_ok(struct xfrm_dst *xdst, struct flowi *fl)
+static int xfrm6_get_saddr(xfrm_address_t *saddr, xfrm_address_t *daddr)
 {
-	do {
-		if (xdst->u.dst.ops != &xfrm6_dst_ops)
-			return 1;
-
-		if (!xfrm_selector_match(&xdst->u.dst.xfrm->sel, fl, AF_INET6))
-			return 0;
-		if (xdst->u.dst.xfrm->km.state != XFRM_STATE_VALID ||
-		    xdst->u.dst.path->obsolete > 0)
-			return 0;
-		xdst = (struct xfrm_dst*)xdst->u.dst.child;
-	} while (xdst);
-	return 0;
+	struct rt6_info *rt;
+	struct flowi fl_tunnel = {
+		.nl_u = {
+			.ip6_u = {
+				.daddr = *(struct in6_addr *)&daddr->a6,
+			},
+		},
+	};
+
+	if (!xfrm6_dst_lookup((struct xfrm_dst **)&rt, &fl_tunnel)) {
+		ipv6_get_saddr(&rt->u.dst, (struct in6_addr *)&daddr->a6,
+			       (struct in6_addr *)&saddr->a6);
+		dst_release(&rt->u.dst);
+		return 0;
+	}
+	return -EHOSTUNREACH;
 }
 
 static struct dst_entry *
@@ -68,9 +73,11 @@ __xfrm6_find_bundle(struct flowi *fl, struct xfrm_policy *policy)
 		ipv6_addr_prefix(&fl_src_prefix,
 				 &fl->fl6_src,
 				 xdst->u.rt6.rt6i_src.plen);
-		if (!ipv6_addr_cmp(&xdst->u.rt6.rt6i_dst.addr, &fl_dst_prefix) &&
-		    !ipv6_addr_cmp(&xdst->u.rt6.rt6i_src.addr, &fl_src_prefix) &&
-		    __xfrm6_bundle_ok(xdst, fl)) {
+		if (ipv6_addr_equal(&xdst->u.rt6.rt6i_dst.addr, &fl_dst_prefix) &&
+		    ipv6_addr_equal(&xdst->u.rt6.rt6i_src.addr, &fl_src_prefix) &&
+		    xfrm_bundle_ok(policy, xdst, fl, AF_INET6,
+				   (xdst->u.rt6.rt6i_dst.plen != 128 ||
+				    xdst->u.rt6.rt6i_src.plen != 128))) {
 			dst_clone(dst);
 			break;
 		}
@@ -79,6 +86,40 @@ __xfrm6_find_bundle(struct flowi *fl, struct xfrm_policy *policy)
 	return dst;
 }
 
+static inline struct in6_addr*
+__xfrm6_bundle_addr_remote(struct xfrm_state *x, struct in6_addr *addr)
+{
+	return (x->type->remote_addr) ?
+		(struct in6_addr*)x->type->remote_addr(x, (xfrm_address_t *)addr) :
+		(struct in6_addr*)&x->id.daddr;
+}
+
+static inline struct in6_addr*
+__xfrm6_bundle_addr_local(struct xfrm_state *x, struct in6_addr *addr)
+{
+	return (x->type->local_addr) ?
+		(struct in6_addr*)x->type->local_addr(x, (xfrm_address_t *)addr) :
+		(struct in6_addr*)&x->props.saddr;
+}
+
+static inline void
+__xfrm6_bundle_len_inc(int *len, int *nflen, struct xfrm_state *x)
+{
+	if (x->type->flags & XFRM_TYPE_NON_FRAGMENT)
+		*nflen += x->props.header_len;
+	else
+		*len += x->props.header_len;
+}
+
+static inline void
+__xfrm6_bundle_len_dec(int *len, int *nflen, struct xfrm_state *x)
+{
+	if (x->type->flags & XFRM_TYPE_NON_FRAGMENT)
+		*nflen -= x->props.header_len;
+	else
+		*len -= x->props.header_len;
+}
+
 /* Allocate chain of dst_entry's, attach known xfrm's, calculate
  * all the metrics... Shortly, bundle a bundle.
  */
@@ -92,18 +133,31 @@ __xfrm6_bundle_create(struct xfrm_policy *policy, struct xfrm_state **xfrm, int
 	struct rt6_info *rt  = rt0;
 	struct in6_addr *remote = &fl->fl6_dst;
 	struct in6_addr *local  = &fl->fl6_src;
+	struct flowi fl_tunnel = {
+		.nl_u = {
+			.ip6_u = {
+				.saddr = *local,
+				.daddr = *remote
+			}
+		}
+	};
 	int i;
 	int err = 0;
 	int header_len = 0;
+	int nfheader_len = 0;
 	int trailer_len = 0;
 
 	dst = dst_prev = NULL;
+	dst_hold(&rt->u.dst);
 
 	for (i = 0; i < nx; i++) {
 		struct dst_entry *dst1 = dst_alloc(&xfrm6_dst_ops);
+		struct xfrm_dst *xdst;
+		int tunnel = 0;
 
 		if (unlikely(dst1 == NULL)) {
 			err = -ENOBUFS;
+			dst_release(&rt->u.dst);
 			goto error;
 		}
 
@@ -114,32 +168,45 @@ __xfrm6_bundle_create(struct xfrm_policy *policy, struct xfrm_state **xfrm, int
 			dst1->flags |= DST_NOHASH;
 			dst_clone(dst1);
 		}
+
+		xdst = (struct xfrm_dst *)dst1;
+		xdst->route = &rt->u.dst;
+		xdst->genid = xfrm[i]->genid;
+		if (rt->rt6i_node)
+			xdst->route_cookie = rt->rt6i_node->fn_sernum;
+
+		dst1->next = dst_prev;
 		dst_prev = dst1;
-		if (xfrm[i]->props.mode) {
-			remote = (struct in6_addr*)&xfrm[i]->id.daddr;
-			local  = (struct in6_addr*)&xfrm[i]->props.saddr;
+		if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) {
+			remote = __xfrm6_bundle_addr_remote(xfrm[i], remote);
+			local  = __xfrm6_bundle_addr_local(xfrm[i], local);
+			tunnel = 1;
 		}
-		header_len += xfrm[i]->props.header_len;
+		__xfrm6_bundle_len_inc(&header_len, &nfheader_len, xfrm[i]);
 		trailer_len += xfrm[i]->props.trailer_len;
+
+		if (tunnel) {
+			ipv6_addr_copy(&fl_tunnel.fl6_dst, remote);
+			ipv6_addr_copy(&fl_tunnel.fl6_src, local);
+			err = xfrm_dst_lookup((struct xfrm_dst **) &rt,
+					      &fl_tunnel, AF_INET6);
+			if (err)
+				goto error;
+		} else
+			dst_hold(&rt->u.dst);
 	}
 
-	if (ipv6_addr_cmp(remote, &fl->fl6_dst)) {
-		struct flowi fl_tunnel;
+	dst_prev->child = &rt->u.dst;
+	dst->path = &rt->u.dst;
+	if (rt->rt6i_node)
+		((struct xfrm_dst *)dst)->path_cookie = rt->rt6i_node->fn_sernum;
 
-		memset(&fl_tunnel, 0, sizeof(fl_tunnel));
-		ipv6_addr_copy(&fl_tunnel.fl6_dst, remote);
-		ipv6_addr_copy(&fl_tunnel.fl6_src, local);
+	*dst_p = dst;
+	dst = dst_prev;
 
-		err = xfrm_dst_lookup((struct xfrm_dst **) &rt,
-				      &fl_tunnel, AF_INET6);
-		if (err)
-			goto error;
-	} else {
-		dst_hold(&rt->u.dst);
-	}
-	dst_prev->child = &rt->u.dst;
+	dst_prev = *dst_p;
 	i = 0;
-	for (dst_prev = dst; dst_prev != &rt->u.dst; dst_prev = dst_prev->child) {
+	for (; dst_prev != &rt->u.dst; dst_prev = dst_prev->child) {
 		struct xfrm_dst *x = (struct xfrm_dst*)dst_prev;
 
 		dst_prev->xfrm = xfrm[i++];
@@ -150,9 +217,9 @@ __xfrm6_bundle_create(struct xfrm_policy *policy, struct xfrm_state **xfrm, int
 		dst_prev->flags	       |= DST_HOST;
 		dst_prev->lastuse	= jiffies;
 		dst_prev->header_len	= header_len;
+		dst_prev->nfheader_len	= nfheader_len;
 		dst_prev->trailer_len	= trailer_len;
-		memcpy(&dst_prev->metrics, &rt->u.dst.metrics, sizeof(dst_prev->metrics));
-		dst_prev->path		= &rt->u.dst;
+		memcpy(&dst_prev->metrics, &x->route->metrics, sizeof(dst_prev->metrics));
 
 		/* Copy neighbour for reachability confirmation */
 		dst_prev->neighbour	= neigh_clone(rt->u.dst.neighbour);
@@ -167,10 +234,13 @@ __xfrm6_bundle_create(struct xfrm_policy *policy, struct xfrm_state **xfrm, int
 		memcpy(&x->u.rt6.rt6i_gateway, &rt0->rt6i_gateway, sizeof(x->u.rt6.rt6i_gateway)); 
 		x->u.rt6.rt6i_dst      = rt0->rt6i_dst;
 		x->u.rt6.rt6i_src      = rt0->rt6i_src;	
-		header_len -= x->u.dst.xfrm->props.header_len;
+		x->u.rt6.rt6i_idev     = rt0->rt6i_idev;
+		in6_dev_hold(rt0->rt6i_idev);
+		__xfrm6_bundle_len_dec(&header_len, &nfheader_len, x->u.dst.xfrm);
 		trailer_len -= x->u.dst.xfrm->props.trailer_len;
 	}
-	*dst_p = dst;
+
+	xfrm_init_pmtu(dst);
 	return 0;
 
 error:
@@ -182,16 +252,18 @@ error:
 static inline void
 _decode_session6(struct sk_buff *skb, struct flowi *fl)
 {
-	u16 offset = sizeof(struct ipv6hdr);
+	u16 offset = skb->h.raw - skb->nh.raw;
 	struct ipv6hdr *hdr = skb->nh.ipv6h;
-	struct ipv6_opt_hdr *exthdr = (struct ipv6_opt_hdr*)(skb->nh.raw + offset);
-	u8 nexthdr = skb->nh.ipv6h->nexthdr;
+	struct ipv6_opt_hdr *exthdr;
+	u8 nexthdr = skb->nh.raw[IP6CB(skb)->nhoff];
 
 	memset(fl, 0, sizeof(struct flowi));
 	ipv6_addr_copy(&fl->fl6_dst, &hdr->daddr);
 	ipv6_addr_copy(&fl->fl6_src, &hdr->saddr);
 
 	while (pskb_may_pull(skb, skb->nh.raw + offset + 1 - skb->data)) {
+		exthdr = (struct ipv6_opt_hdr*)(skb->nh.raw + offset);
+
 		switch (nexthdr) {
 		case NEXTHDR_ROUTING:
 		case NEXTHDR_HOP:
@@ -202,10 +274,12 @@ _decode_session6(struct sk_buff *skb, struct flowi *fl)
 			break;
 
 		case IPPROTO_UDP:
+		case IPPROTO_UDPLITE:
 		case IPPROTO_TCP:
 		case IPPROTO_SCTP:
+		case IPPROTO_DCCP:
 			if (pskb_may_pull(skb, skb->nh.raw + offset + 4 - skb->data)) {
-				u16 *ports = (u16 *)exthdr;
+				__be16 *ports = (__be16 *)exthdr;
 
 				fl->fl_ip_sport = ports[0];
 				fl->fl_ip_dport = ports[1];
@@ -223,6 +297,18 @@ _decode_session6(struct sk_buff *skb, struct flowi *fl)
 			fl->proto = nexthdr;
 			return;
 
+#ifdef CONFIG_IPV6_MIP6
+		case IPPROTO_MH:
+			if (pskb_may_pull(skb, skb->nh.raw + offset + 3 - skb->data)) {
+				struct ip6_mh *mh;
+				mh = (struct ip6_mh *)exthdr;
+
+				fl->fl_mh_type = mh->ip6mh_type;
+			}
+			fl->proto = nexthdr;
+			return;
+#endif
+
 		/* XXX Why are there these headers? */
 		case IPPROTO_AH:
 		case IPPROTO_ESP:
@@ -237,20 +323,51 @@ _decode_session6(struct sk_buff *skb, struct flowi *fl)
 
 static inline int xfrm6_garbage_collect(void)
 {
-	read_lock(&xfrm6_policy_afinfo.lock);
 	xfrm6_policy_afinfo.garbage_collect();
-	read_unlock(&xfrm6_policy_afinfo.lock);
 	return (atomic_read(&xfrm6_dst_ops.entries) > xfrm6_dst_ops.gc_thresh*2);
 }
 
 static void xfrm6_update_pmtu(struct dst_entry *dst, u32 mtu)
 {
-	struct dst_entry *path = dst->path;
+	struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
+	struct dst_entry *path = xdst->route;
+
+	path->ops->update_pmtu(path, mtu);
+}
+
+static void xfrm6_dst_destroy(struct dst_entry *dst)
+{
+	struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
+
+	if (likely(xdst->u.rt6.rt6i_idev))
+		in6_dev_put(xdst->u.rt6.rt6i_idev);
+	xfrm_dst_destroy(xdst);
+}
+
+static void xfrm6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
+			     int unregister)
+{
+	struct xfrm_dst *xdst;
+
+	if (!unregister)
+		return;
+
+	xdst = (struct xfrm_dst *)dst;
+	if (xdst->u.rt6.rt6i_idev->dev == dev) {
+		struct inet6_dev *loopback_idev = in6_dev_get(&loopback_dev);
+		BUG_ON(!loopback_idev);
+
+		do {
+			in6_dev_put(xdst->u.rt6.rt6i_idev);
+			xdst->u.rt6.rt6i_idev = loopback_idev;
+			in6_dev_hold(loopback_idev);
+			xdst = (struct xfrm_dst *)xdst->u.dst.child;
+		} while (xdst->u.dst.xfrm);
+
+		__in6_dev_put(loopback_idev);
+	}
 
-	if (mtu >= IPV6_MIN_MTU && mtu < dst_pmtu(dst))
-		path->ops->update_pmtu(path, mtu);
-	
-	return;
+	xfrm_dst_ifdown(dst, dev);
 }
 
 static struct dst_ops xfrm6_dst_ops = {
@@ -258,16 +375,17 @@ static struct dst_ops xfrm6_dst_ops = {
 	.protocol =		__constant_htons(ETH_P_IPV6),
 	.gc =			xfrm6_garbage_collect,
 	.update_pmtu =		xfrm6_update_pmtu,
+	.destroy =		xfrm6_dst_destroy,
+	.ifdown =		xfrm6_dst_ifdown,
 	.gc_thresh =		1024,
 	.entry_size =		sizeof(struct xfrm_dst),
 };
 
 static struct xfrm_policy_afinfo xfrm6_policy_afinfo = {
 	.family =		AF_INET6,
-	.lock = 		RW_LOCK_UNLOCKED,
-	.type_map = 		&xfrm6_type_map,
 	.dst_ops =		&xfrm6_dst_ops,
 	.dst_lookup =		xfrm6_dst_lookup,
+	.get_saddr = 		xfrm6_get_saddr,
 	.find_bundle =		__xfrm6_find_bundle,
 	.bundle_create =	__xfrm6_bundle_create,
 	.decode_session =	_decode_session6,
@@ -278,7 +396,7 @@ static void __init xfrm6_policy_init(void)
 	xfrm_policy_register_afinfo(&xfrm6_policy_afinfo);
 }
 
-static void __exit xfrm6_policy_fini(void)
+static void xfrm6_policy_fini(void)
 {
 	xfrm_policy_unregister_afinfo(&xfrm6_policy_afinfo);
 }
@@ -289,7 +407,7 @@ void __init xfrm6_init(void)
 	xfrm6_state_init();
 }
 
-void __exit xfrm6_fini(void)
+void xfrm6_fini(void)
 {
 	//xfrm6_input_fini();
 	xfrm6_policy_fini();