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Diffstat (limited to '')
-rw-r--r-- | include/net/ip6_fib.h | 524 |
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 |