| /* |
| * 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, |
| fc_ignore_dev_down:1, |
| __unused : 14; |
| |
| 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, |
| unused:3; |
| |
| 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 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 = 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 && (rt->rt6i_flags & RTF_PCPU || |
| unlikely(!list_empty(&rt->rt6i_uncached)))) |
| 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); |
| void fib6_clean_all_skip_notify(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 |
| void rt6_get_prefsrc(const struct rt6_info *rt, struct in6_addr *addr) |
| { |
| const struct fib6_info *from; |
| |
| rcu_read_lock(); |
| |
| from = rcu_dereference(rt->from); |
| if (from) { |
| *addr = from->fib6_prefsrc.addr; |
| } else { |
| struct in6_addr in6_zero = {}; |
| |
| *addr = in6_zero; |
| } |
| |
| rcu_read_unlock(); |
| } |
| |
| 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 |