Initial import

1 files changed, 326 insertions, 0 deletions

diff --git a/include/net/ip6_fib.h b/include/net/ip6_fib.h
new file mode 100644
index 000000000..20e80fa7b
--- /dev/null
+++ b/include/net/ip6_fib.h
@@ -0,0 +1,326 @@
+/*
+ *	Linux INET6 implementation 
+ *
+ *	Authors:
+ *	Pedro Roque		<roque@di.fc.ul.pt>	
+ *
+ *	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.
+ */
+
+#ifndef _IP6_FIB_H
+#define _IP6_FIB_H
+
+#include <linux/ipv6_route.h>
+#include <linux/rtnetlink.h>
+#include <linux/spinlock.h>
+#include <net/dst.h>
+#include <net/flow.h>
+#include <net/netlink.h>
+#include <net/inetpeer.h>
+
+#ifdef CONFIG_IPV6_MULTIPLE_TABLES
+#define FIB6_TABLE_HASHSZ 256
+#else
+#define FIB6_TABLE_HASHSZ 1
+#endif
+
+struct rt6_info;
+
+struct fib6_config {
+	u32		fc_table;
+	u32		fc_metric;
+	int		fc_dst_len;
+	int		fc_src_len;
+	int		fc_ifindex;
+	u32		fc_flags;
+	u32		fc_protocol;
+	u32		fc_type;	/* only 8 bits are used */
+
+	struct in6_addr	fc_dst;
+	struct in6_addr	fc_src;
+	struct in6_addr	fc_prefsrc;
+	struct in6_addr	fc_gateway;
+
+	unsigned long	fc_expires;
+	struct nlattr	*fc_mx;
+	int		fc_mx_len;
+	int		fc_mp_len;
+	struct nlattr	*fc_mp;
+
+	struct nl_info	fc_nlinfo;
+};
+
+struct fib6_node {
+	struct fib6_node	*parent;
+	struct fib6_node	*left;
+	struct fib6_node	*right;
+#ifdef CONFIG_IPV6_SUBTREES
+	struct fib6_node	*subtree;
+#endif
+	struct rt6_info		*leaf;
+
+	__u16			fn_bit;		/* bit key */
+	__u16			fn_flags;
+	int			fn_sernum;
+	struct rt6_info		*rr_ptr;
+};
+
+#ifndef CONFIG_IPV6_SUBTREES
+#define FIB6_SUBTREE(fn)	NULL
+#else
+#define FIB6_SUBTREE(fn)	((fn)->subtree)
+#endif
+
+struct mx6_config {
+	const u32 *mx;
+	DECLARE_BITMAP(mx_valid, RTAX_MAX);
+};
+
+/*
+ *	routing information
+ *
+ */
+
+struct rt6key {
+	struct in6_addr	addr;
+	int		plen;
+};
+
+struct fib6_table;
+
+struct rt6_info {
+	struct dst_entry		dst;
+
+	/*
+	 * Tail elements of dst_entry (__refcnt etc.)
+	 * and these elements (rarely used in hot path) are in
+	 * the same cache line.
+	 */
+	struct fib6_table		*rt6i_table;
+	struct fib6_node		*rt6i_node;
+
+	struct in6_addr			rt6i_gateway;
+
+	/* Multipath routes:
+	 * siblings is a list of rt6_info that have the the same metric/weight,
+	 * destination, but not the same gateway. nsiblings is just a cache
+	 * to speed up lookup.
+	 */
+	struct list_head		rt6i_siblings;
+	unsigned int			rt6i_nsiblings;
+
+	atomic_t			rt6i_ref;
+
+	/* These are in a separate cache line. */
+	struct rt6key			rt6i_dst ____cacheline_aligned_in_smp;
+	u32				rt6i_flags;
+	struct rt6key			rt6i_src;
+	struct rt6key			rt6i_prefsrc;
+
+	struct inet6_dev		*rt6i_idev;
+	unsigned long			_rt6i_peer;
+
+	u32				rt6i_metric;
+	/* more non-fragment space at head required */
+	unsigned short			rt6i_nfheader_len;
+	u8				rt6i_protocol;
+};
+
+static inline struct inet_peer *rt6_peer_ptr(struct rt6_info *rt)
+{
+	return inetpeer_ptr(rt->_rt6i_peer);
+}
+
+static inline bool rt6_has_peer(struct rt6_info *rt)
+{
+	return inetpeer_ptr_is_peer(rt->_rt6i_peer);
+}
+
+static inline void __rt6_set_peer(struct rt6_info *rt, struct inet_peer *peer)
+{
+	__inetpeer_ptr_set_peer(&rt->_rt6i_peer, peer);
+}
+
+static inline bool rt6_set_peer(struct rt6_info *rt, struct inet_peer *peer)
+{
+	return inetpeer_ptr_set_peer(&rt->_rt6i_peer, peer);
+}
+
+static inline void rt6_init_peer(struct rt6_info *rt, struct inet_peer_base *base)
+{
+	inetpeer_init_ptr(&rt->_rt6i_peer, base);
+}
+
+static inline void rt6_transfer_peer(struct rt6_info *rt, struct rt6_info *ort)
+{
+	inetpeer_transfer_peer(&rt->_rt6i_peer, &ort->_rt6i_peer);
+}
+
+static inline struct inet6_dev *ip6_dst_idev(struct dst_entry *dst)
+{
+	return ((struct rt6_info *)dst)->rt6i_idev;
+}
+
+static inline void rt6_clean_expires(struct rt6_info *rt)
+{
+	rt->rt6i_flags &= ~RTF_EXPIRES;
+	rt->dst.expires = 0;
+}
+
+static inline void rt6_set_expires(struct rt6_info *rt, unsigned long expires)
+{
+	rt->dst.expires = expires;
+	rt->rt6i_flags |= RTF_EXPIRES;
+}
+
+static inline void rt6_update_expires(struct rt6_info *rt0, int timeout)
+{
+	struct rt6_info *rt;
+
+	for (rt = rt0; rt && !(rt->rt6i_flags & RTF_EXPIRES);
+	     rt = (struct rt6_info *)rt->dst.from);
+	if (rt && rt != rt0)
+		rt0->dst.expires = rt->dst.expires;
+
+	dst_set_expires(&rt0->dst, timeout);
+	rt0->rt6i_flags |= RTF_EXPIRES;
+}
+
+static inline void rt6_set_from(struct rt6_info *rt, struct rt6_info *from)
+{
+	struct dst_entry *new = (struct dst_entry *) from;
+
+	rt->rt6i_flags &= ~RTF_EXPIRES;
+	dst_hold(new);
+	rt->dst.from = new;
+}
+
+static inline void ip6_rt_put(struct rt6_info *rt)
+{
+	/* dst_release() accepts a NULL parameter.
+	 * We rely on dst being first structure in struct rt6_info
+	 */
+	BUILD_BUG_ON(offsetof(struct rt6_info, dst) != 0);
+	dst_release(&rt->dst);
+}
+
+enum fib6_walk_state {
+#ifdef CONFIG_IPV6_SUBTREES
+	FWS_S,
+#endif
+	FWS_L,
+	FWS_R,
+	FWS_C,
+	FWS_U
+};
+
+struct fib6_walker {
+	struct list_head lh;
+	struct fib6_node *root, *node;
+	struct rt6_info *leaf;
+	enum fib6_walk_state state;
+	bool prune;
+	unsigned int skip;
+	unsigned int count;
+	int (*func)(struct fib6_walker *);
+	void *args;
+};
+
+struct rt6_statistics {
+	__u32		fib_nodes;
+	__u32		fib_route_nodes;
+	__u32		fib_rt_alloc;		/* permanent routes	*/
+	__u32		fib_rt_entries;		/* rt entries in table	*/
+	__u32		fib_rt_cache;		/* cache routes		*/
+	__u32		fib_discarded_routes;
+};
+
+#define RTN_TL_ROOT	0x0001
+#define RTN_ROOT	0x0002		/* tree root node		*/
+#define RTN_RTINFO	0x0004		/* node with valid routing info	*/
+
+/*
+ *	priority levels (or metrics)
+ *
+ */
+
+
+struct fib6_table {
+	struct hlist_node	tb6_hlist;
+	u32			tb6_id;
+	rwlock_t		tb6_lock;
+	struct fib6_node	tb6_root;
+	struct inet_peer_base	tb6_peers;
+};
+
+#define RT6_TABLE_UNSPEC	RT_TABLE_UNSPEC
+#define RT6_TABLE_MAIN		RT_TABLE_MAIN
+#define RT6_TABLE_DFLT		RT6_TABLE_MAIN
+#define RT6_TABLE_INFO		RT6_TABLE_MAIN
+#define RT6_TABLE_PREFIX	RT6_TABLE_MAIN
+
+#ifdef CONFIG_IPV6_MULTIPLE_TABLES
+#define FIB6_TABLE_MIN		1
+#define FIB6_TABLE_MAX		RT_TABLE_MAX
+#define RT6_TABLE_LOCAL		RT_TABLE_LOCAL
+#else
+#define FIB6_TABLE_MIN		RT_TABLE_MAIN
+#define FIB6_TABLE_MAX		FIB6_TABLE_MIN
+#define RT6_TABLE_LOCAL		RT6_TABLE_MAIN
+#endif
+
+typedef struct rt6_info *(*pol_lookup_t)(struct net *,
+					 struct fib6_table *,
+					 struct flowi6 *, int);
+
+/*
+ *	exported functions
+ */
+
+struct fib6_table *fib6_get_table(struct net *net, u32 id);
+struct fib6_table *fib6_new_table(struct net *net, u32 id);
+struct dst_entry *fib6_rule_lookup(struct net *net, struct flowi6 *fl6,
+				   int flags, pol_lookup_t lookup);
+
+struct fib6_node *fib6_lookup(struct fib6_node *root,
+			      const struct in6_addr *daddr,
+			      const struct in6_addr *saddr);
+
+struct fib6_node *fib6_locate(struct fib6_node *root,
+			      const struct in6_addr *daddr, int dst_len,
+			      const struct in6_addr *saddr, int src_len);
+
+void fib6_clean_all(struct net *net, int (*func)(struct rt6_info *, void *arg),
+		    void *arg);
+
+int fib6_add(struct fib6_node *root, struct rt6_info *rt,
+	     struct nl_info *info, struct mx6_config *mxc);
+int fib6_del(struct rt6_info *rt, struct nl_info *info);
+
+void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info);
+
+void fib6_run_gc(unsigned long expires, struct net *net, bool force);
+
+void fib6_gc_cleanup(void);
+
+int fib6_init(void);
+
+int ipv6_route_open(struct inode *inode, struct file *file);
+
+#ifdef CONFIG_IPV6_MULTIPLE_TABLES
+int fib6_rules_init(void);
+void fib6_rules_cleanup(void);
+#else
+static inline int               fib6_rules_init(void)
+{
+	return 0;
+}
+static inline void              fib6_rules_cleanup(void)
+{
+	return ;
+}
+#endif
+#endif