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-rw-r--r--include/net/ip6_fib.h524
1 files changed, 524 insertions, 0 deletions
diff --git a/include/net/ip6_fib.h b/include/net/ip6_fib.h
new file mode 100644
index 000000000..b4fea9dd5
--- /dev/null
+++ b/include/net/ip6_fib.h
@@ -0,0 +1,524 @@
+/*
+ * 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 <linux/notifier.h>
+#include <net/dst.h>
+#include <net/flow.h>
+#include <net/netlink.h>
+#include <net/inetpeer.h>
+#include <net/fib_notifier.h>
+
+#ifdef CONFIG_IPV6_MULTIPLE_TABLES
+#define FIB6_TABLE_HASHSZ 256
+#else
+#define FIB6_TABLE_HASHSZ 1
+#endif
+
+#define RT6_DEBUG 2
+
+#if RT6_DEBUG >= 3
+#define RT6_TRACE(x...) pr_debug(x)
+#else
+#define RT6_TRACE(x...) do { ; } while (0)
+#endif
+
+struct rt6_info;
+struct fib6_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;
+ u16 fc_type; /* only 8 bits are used */
+ u16 fc_delete_all_nh : 1,
+ __unused : 15;
+
+ 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 nlattr *fc_encap;
+ u16 fc_encap_type;
+};
+
+struct fib6_node {
+ struct fib6_node __rcu *parent;
+ struct fib6_node __rcu *left;
+ struct fib6_node __rcu *right;
+#ifdef CONFIG_IPV6_SUBTREES
+ struct fib6_node __rcu *subtree;
+#endif
+ struct fib6_info __rcu *leaf;
+
+ __u16 fn_bit; /* bit key */
+ __u16 fn_flags;
+ int fn_sernum;
+ struct fib6_info __rcu *rr_ptr;
+ struct rcu_head rcu;
+};
+
+struct fib6_gc_args {
+ int timeout;
+ int more;
+};
+
+#ifndef CONFIG_IPV6_SUBTREES
+#define FIB6_SUBTREE(fn) NULL
+#else
+#define FIB6_SUBTREE(fn) (rcu_dereference_protected((fn)->subtree, 1))
+#endif
+
+/*
+ * routing information
+ *
+ */
+
+struct rt6key {
+ struct in6_addr addr;
+ int plen;
+};
+
+struct fib6_table;
+
+struct rt6_exception_bucket {
+ struct hlist_head chain;
+ int depth;
+};
+
+struct rt6_exception {
+ struct hlist_node hlist;
+ struct rt6_info *rt6i;
+ unsigned long stamp;
+ struct rcu_head rcu;
+};
+
+#define FIB6_EXCEPTION_BUCKET_SIZE_SHIFT 10
+#define FIB6_EXCEPTION_BUCKET_SIZE (1 << FIB6_EXCEPTION_BUCKET_SIZE_SHIFT)
+#define FIB6_MAX_DEPTH 5
+
+struct fib6_nh {
+ struct in6_addr nh_gw;
+ struct net_device *nh_dev;
+ struct lwtunnel_state *nh_lwtstate;
+
+ unsigned int nh_flags;
+ atomic_t nh_upper_bound;
+ int nh_weight;
+};
+
+struct fib6_info {
+ struct fib6_table *fib6_table;
+ struct fib6_info __rcu *fib6_next;
+ struct fib6_node __rcu *fib6_node;
+
+ /* Multipath routes:
+ * siblings is a list of fib6_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 fib6_siblings;
+ unsigned int fib6_nsiblings;
+
+ atomic_t fib6_ref;
+ unsigned long expires;
+ struct dst_metrics *fib6_metrics;
+#define fib6_pmtu fib6_metrics->metrics[RTAX_MTU-1]
+
+ struct rt6key fib6_dst;
+ u32 fib6_flags;
+ struct rt6key fib6_src;
+ struct rt6key fib6_prefsrc;
+
+ struct rt6_info * __percpu *rt6i_pcpu;
+ struct rt6_exception_bucket __rcu *rt6i_exception_bucket;
+
+#ifdef CONFIG_IPV6_ROUTER_PREF
+ unsigned long last_probe;
+#endif
+
+ u32 fib6_metric;
+ u8 fib6_protocol;
+ u8 fib6_type;
+ u8 exception_bucket_flushed:1,
+ should_flush:1,
+ dst_nocount:1,
+ dst_nopolicy:1,
+ dst_host:1,
+ fib6_destroying:1,
+ unused:2;
+
+ struct fib6_nh fib6_nh;
+ struct rcu_head rcu;
+};
+
+struct rt6_info {
+ struct dst_entry dst;
+ struct fib6_info __rcu *from;
+
+ struct rt6key rt6i_dst;
+ struct rt6key rt6i_src;
+ struct in6_addr rt6i_gateway;
+ struct inet6_dev *rt6i_idev;
+ u32 rt6i_flags;
+ struct rt6key rt6i_prefsrc;
+
+ struct list_head rt6i_uncached;
+ struct uncached_list *rt6i_uncached_list;
+
+ /* more non-fragment space at head required */
+ unsigned short rt6i_nfheader_len;
+};
+
+#define for_each_fib6_node_rt_rcu(fn) \
+ for (rt = rcu_dereference((fn)->leaf); rt; \
+ rt = rcu_dereference(rt->fib6_next))
+
+#define for_each_fib6_walker_rt(w) \
+ for (rt = (w)->leaf; rt; \
+ rt = rcu_dereference_protected(rt->fib6_next, 1))
+
+static inline struct inet6_dev *ip6_dst_idev(struct dst_entry *dst)
+{
+ return ((struct rt6_info *)dst)->rt6i_idev;
+}
+
+static inline void fib6_clean_expires(struct fib6_info *f6i)
+{
+ f6i->fib6_flags &= ~RTF_EXPIRES;
+ f6i->expires = 0;
+}
+
+static inline void fib6_set_expires(struct fib6_info *f6i,
+ unsigned long expires)
+{
+ f6i->expires = expires;
+ f6i->fib6_flags |= RTF_EXPIRES;
+}
+
+static inline bool fib6_check_expired(const struct fib6_info *f6i)
+{
+ if (f6i->fib6_flags & RTF_EXPIRES)
+ return time_after(jiffies, f6i->expires);
+ return false;
+}
+
+/* Function to safely get fn->sernum for passed in rt
+ * and store result in passed in cookie.
+ * Return true if we can get cookie safely
+ * Return false if not
+ */
+static inline bool fib6_get_cookie_safe(const struct fib6_info *f6i,
+ u32 *cookie)
+{
+ struct fib6_node *fn;
+ bool status = false;
+
+ fn = rcu_dereference(f6i->fib6_node);
+
+ if (fn) {
+ *cookie = READ_ONCE(fn->fn_sernum);
+ /* pairs with smp_wmb() in fib6_update_sernum_upto_root() */
+ smp_rmb();
+ status = true;
+ }
+
+ return status;
+}
+
+static inline u32 rt6_get_cookie(const struct rt6_info *rt)
+{
+ struct fib6_info *from;
+ u32 cookie = 0;
+
+ rcu_read_lock();
+
+ from = rcu_dereference(rt->from);
+ if (from)
+ fib6_get_cookie_safe(from, &cookie);
+
+ rcu_read_unlock();
+
+ return cookie;
+}
+
+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);
+}
+
+struct fib6_info *fib6_info_alloc(gfp_t gfp_flags);
+void fib6_info_destroy_rcu(struct rcu_head *head);
+
+static inline void fib6_info_hold(struct fib6_info *f6i)
+{
+ atomic_inc(&f6i->fib6_ref);
+}
+
+static inline bool fib6_info_hold_safe(struct fib6_info *f6i)
+{
+ return atomic_inc_not_zero(&f6i->fib6_ref);
+}
+
+static inline void fib6_info_release(struct fib6_info *f6i)
+{
+ if (f6i && atomic_dec_and_test(&f6i->fib6_ref))
+ call_rcu(&f6i->rcu, fib6_info_destroy_rcu);
+}
+
+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 fib6_info *leaf;
+ enum fib6_walk_state state;
+ unsigned int skip;
+ unsigned int count;
+ int (*func)(struct fib6_walker *);
+ void *args;
+};
+
+struct rt6_statistics {
+ __u32 fib_nodes; /* all fib6 nodes */
+ __u32 fib_route_nodes; /* intermediate nodes */
+ __u32 fib_rt_entries; /* rt entries in fib table */
+ __u32 fib_rt_cache; /* cached rt entries in exception table */
+ __u32 fib_discarded_routes; /* total number of routes delete */
+
+ /* The following stats are not protected by any lock */
+ atomic_t fib_rt_alloc; /* total number of routes alloced */
+ atomic_t fib_rt_uncache; /* rt entries in uncached list */
+};
+
+#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;
+ spinlock_t tb6_lock;
+ struct fib6_node tb6_root;
+ struct inet_peer_base tb6_peers;
+ unsigned int flags;
+ unsigned int fib_seq;
+#define RT6_TABLE_HAS_DFLT_ROUTER BIT(0)
+};
+
+#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 *,
+ const struct sk_buff *, int);
+
+struct fib6_entry_notifier_info {
+ struct fib_notifier_info info; /* must be first */
+ struct fib6_info *rt;
+};
+
+/*
+ * 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,
+ const struct sk_buff *skb,
+ int flags, pol_lookup_t lookup);
+
+/* called with rcu lock held; can return error pointer
+ * caller needs to select path
+ */
+struct fib6_info *fib6_lookup(struct net *net, int oif, struct flowi6 *fl6,
+ int flags);
+
+/* called with rcu lock held; caller needs to select path */
+struct fib6_info *fib6_table_lookup(struct net *net, struct fib6_table *table,
+ int oif, struct flowi6 *fl6, int strict);
+
+struct fib6_info *fib6_multipath_select(const struct net *net,
+ struct fib6_info *match,
+ struct flowi6 *fl6, int oif,
+ const struct sk_buff *skb, int strict);
+
+struct fib6_node *fib6_node_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,
+ bool exact_match);
+
+void fib6_clean_all(struct net *net, int (*func)(struct fib6_info *, void *arg),
+ void *arg);
+
+int fib6_add(struct fib6_node *root, struct fib6_info *rt,
+ struct nl_info *info, struct netlink_ext_ack *extack);
+int fib6_del(struct fib6_info *rt, struct nl_info *info);
+
+static inline struct net_device *fib6_info_nh_dev(const struct fib6_info *f6i)
+{
+ return f6i->fib6_nh.nh_dev;
+}
+
+static inline
+struct lwtunnel_state *fib6_info_nh_lwt(const struct fib6_info *f6i)
+{
+ return f6i->fib6_nh.nh_lwtstate;
+}
+
+void inet6_rt_notify(int event, struct fib6_info *rt, struct nl_info *info,
+ unsigned int flags);
+
+void fib6_run_gc(unsigned long expires, struct net *net, bool force);
+
+void fib6_gc_cleanup(void);
+
+int fib6_init(void);
+
+struct ipv6_route_iter {
+ struct seq_net_private p;
+ struct fib6_walker w;
+ loff_t skip;
+ struct fib6_table *tbl;
+ int sernum;
+};
+
+extern const struct seq_operations ipv6_route_seq_ops;
+
+int call_fib6_notifier(struct notifier_block *nb, struct net *net,
+ enum fib_event_type event_type,
+ struct fib_notifier_info *info);
+int call_fib6_notifiers(struct net *net, enum fib_event_type event_type,
+ struct fib_notifier_info *info);
+
+int __net_init fib6_notifier_init(struct net *net);
+void __net_exit fib6_notifier_exit(struct net *net);
+
+unsigned int fib6_tables_seq_read(struct net *net);
+int fib6_tables_dump(struct net *net, struct notifier_block *nb);
+
+void fib6_update_sernum(struct net *net, struct fib6_info *rt);
+void fib6_update_sernum_upto_root(struct net *net, struct fib6_info *rt);
+
+void fib6_metric_set(struct fib6_info *f6i, int metric, u32 val);
+static inline bool fib6_metric_locked(struct fib6_info *f6i, int metric)
+{
+ return !!(f6i->fib6_metrics->metrics[RTAX_LOCK - 1] & (1 << metric));
+}
+
+#ifdef CONFIG_IPV6_MULTIPLE_TABLES
+int fib6_rules_init(void);
+void fib6_rules_cleanup(void);
+bool fib6_rule_default(const struct fib_rule *rule);
+int fib6_rules_dump(struct net *net, struct notifier_block *nb);
+unsigned int fib6_rules_seq_read(struct net *net);
+
+static inline bool fib6_rules_early_flow_dissect(struct net *net,
+ struct sk_buff *skb,
+ struct flowi6 *fl6,
+ struct flow_keys *flkeys)
+{
+ unsigned int flag = FLOW_DISSECTOR_F_STOP_AT_ENCAP;
+
+ if (!net->ipv6.fib6_rules_require_fldissect)
+ return false;
+
+ skb_flow_dissect_flow_keys(skb, flkeys, flag);
+ fl6->fl6_sport = flkeys->ports.src;
+ fl6->fl6_dport = flkeys->ports.dst;
+ fl6->flowi6_proto = flkeys->basic.ip_proto;
+
+ return true;
+}
+#else
+static inline int fib6_rules_init(void)
+{
+ return 0;
+}
+static inline void fib6_rules_cleanup(void)
+{
+ return ;
+}
+static inline bool fib6_rule_default(const struct fib_rule *rule)
+{
+ return true;
+}
+static inline int fib6_rules_dump(struct net *net, struct notifier_block *nb)
+{
+ return 0;
+}
+static inline unsigned int fib6_rules_seq_read(struct net *net)
+{
+ return 0;
+}
+static inline bool fib6_rules_early_flow_dissect(struct net *net,
+ struct sk_buff *skb,
+ struct flowi6 *fl6,
+ struct flow_keys *flkeys)
+{
+ return false;
+}
+#endif
+#endif
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-04 01:58:11 +0000