1ab84be7eSDavid Ahern /* SPDX-License-Identifier: GPL-2.0 */ 2ab84be7eSDavid Ahern /* 3ab84be7eSDavid Ahern * Generic nexthop implementation 4ab84be7eSDavid Ahern * 5ab84be7eSDavid Ahern * Copyright (c) 2017-19 Cumulus Networks 6ab84be7eSDavid Ahern * Copyright (c) 2017-19 David Ahern <dsa@cumulusnetworks.com> 7ab84be7eSDavid Ahern */ 8ab84be7eSDavid Ahern 9ab84be7eSDavid Ahern #ifndef __LINUX_NEXTHOP_H 10ab84be7eSDavid Ahern #define __LINUX_NEXTHOP_H 11ab84be7eSDavid Ahern 12ab84be7eSDavid Ahern #include <linux/netdevice.h> 138590ceedSRoopa Prabhu #include <linux/notifier.h> 14f88d8ea6SDavid Ahern #include <linux/route.h> 15ab84be7eSDavid Ahern #include <linux/types.h> 16ab84be7eSDavid Ahern #include <net/ip_fib.h> 1753010f99SDavid Ahern #include <net/ip6_fib.h> 18ab84be7eSDavid Ahern #include <net/netlink.h> 19ab84be7eSDavid Ahern 20ab84be7eSDavid Ahern #define NEXTHOP_VALID_USER_FLAGS RTNH_F_ONLINK 21ab84be7eSDavid Ahern 22ab84be7eSDavid Ahern struct nexthop; 23ab84be7eSDavid Ahern 24ab84be7eSDavid Ahern struct nh_config { 25ab84be7eSDavid Ahern u32 nh_id; 26ab84be7eSDavid Ahern 27ab84be7eSDavid Ahern u8 nh_family; 28ab84be7eSDavid Ahern u8 nh_protocol; 29ab84be7eSDavid Ahern u8 nh_blackhole; 3038428d68SRoopa Prabhu u8 nh_fdb; 31ab84be7eSDavid Ahern u32 nh_flags; 32ab84be7eSDavid Ahern 33ab84be7eSDavid Ahern int nh_ifindex; 34ab84be7eSDavid Ahern struct net_device *dev; 35ab84be7eSDavid Ahern 36597cfe4fSDavid Ahern union { 37597cfe4fSDavid Ahern __be32 ipv4; 3853010f99SDavid Ahern struct in6_addr ipv6; 39597cfe4fSDavid Ahern } gw; 40597cfe4fSDavid Ahern 41430a0491SDavid Ahern struct nlattr *nh_grp; 42430a0491SDavid Ahern u16 nh_grp_type; 43283a72a5SPetr Machata u16 nh_grp_res_num_buckets; 44283a72a5SPetr Machata unsigned long nh_grp_res_idle_timer; 45283a72a5SPetr Machata unsigned long nh_grp_res_unbalanced_timer; 46283a72a5SPetr Machata bool nh_grp_res_has_num_buckets; 47283a72a5SPetr Machata bool nh_grp_res_has_idle_timer; 48283a72a5SPetr Machata bool nh_grp_res_has_unbalanced_timer; 49430a0491SDavid Ahern 50b513bd03SDavid Ahern struct nlattr *nh_encap; 51b513bd03SDavid Ahern u16 nh_encap_type; 52b513bd03SDavid Ahern 53ab84be7eSDavid Ahern u32 nlflags; 54ab84be7eSDavid Ahern struct nl_info nlinfo; 55ab84be7eSDavid Ahern }; 56ab84be7eSDavid Ahern 57ab84be7eSDavid Ahern struct nh_info { 58ab84be7eSDavid Ahern struct hlist_node dev_hash; /* entry on netns devhash */ 59ab84be7eSDavid Ahern struct nexthop *nh_parent; 60ab84be7eSDavid Ahern 61ab84be7eSDavid Ahern u8 family; 62ab84be7eSDavid Ahern bool reject_nh; 6338428d68SRoopa Prabhu bool fdb_nh; 64ab84be7eSDavid Ahern 65ab84be7eSDavid Ahern union { 66ab84be7eSDavid Ahern struct fib_nh_common fib_nhc; 67597cfe4fSDavid Ahern struct fib_nh fib_nh; 6853010f99SDavid Ahern struct fib6_nh fib6_nh; 69ab84be7eSDavid Ahern }; 70ab84be7eSDavid Ahern }; 71ab84be7eSDavid Ahern 72283a72a5SPetr Machata struct nh_res_bucket { 73283a72a5SPetr Machata struct nh_grp_entry __rcu *nh_entry; 74283a72a5SPetr Machata atomic_long_t used_time; 75283a72a5SPetr Machata unsigned long migrated_time; 76283a72a5SPetr Machata bool occupied; 77283a72a5SPetr Machata u8 nh_flags; 78283a72a5SPetr Machata }; 79283a72a5SPetr Machata 80283a72a5SPetr Machata struct nh_res_table { 81283a72a5SPetr Machata struct net *net; 82283a72a5SPetr Machata u32 nhg_id; 83283a72a5SPetr Machata struct delayed_work upkeep_dw; 84283a72a5SPetr Machata 85283a72a5SPetr Machata /* List of NHGEs that have too few buckets ("uw" for underweight). 86283a72a5SPetr Machata * Reclaimed buckets will be given to entries in this list. 87283a72a5SPetr Machata */ 88283a72a5SPetr Machata struct list_head uw_nh_entries; 89283a72a5SPetr Machata unsigned long unbalanced_since; 90283a72a5SPetr Machata 91283a72a5SPetr Machata u32 idle_timer; 92283a72a5SPetr Machata u32 unbalanced_timer; 93283a72a5SPetr Machata 94283a72a5SPetr Machata u16 num_nh_buckets; 952253bb3fSKees Cook struct nh_res_bucket nh_buckets[] __counted_by(num_nh_buckets); 96283a72a5SPetr Machata }; 97283a72a5SPetr Machata 98*f4676ea7SIdo Schimmel struct nh_grp_entry_stats { 99*f4676ea7SIdo Schimmel u64_stats_t packets; 100*f4676ea7SIdo Schimmel struct u64_stats_sync syncp; 101*f4676ea7SIdo Schimmel }; 102*f4676ea7SIdo Schimmel 103430a0491SDavid Ahern struct nh_grp_entry { 104430a0491SDavid Ahern struct nexthop *nh; 105*f4676ea7SIdo Schimmel struct nh_grp_entry_stats __percpu *stats; 106430a0491SDavid Ahern u8 weight; 107b9bae61bSPetr Machata 108b9bae61bSPetr Machata union { 109b9bae61bSPetr Machata struct { 110430a0491SDavid Ahern atomic_t upper_bound; 111de1d1ee3SPetr Machata } hthr; 112283a72a5SPetr Machata struct { 113283a72a5SPetr Machata /* Member on uw_nh_entries. */ 114283a72a5SPetr Machata struct list_head uw_nh_entry; 115283a72a5SPetr Machata 116283a72a5SPetr Machata u16 count_buckets; 117283a72a5SPetr Machata u16 wants_buckets; 118283a72a5SPetr Machata } res; 119b9bae61bSPetr Machata }; 120430a0491SDavid Ahern 121430a0491SDavid Ahern struct list_head nh_list; 122430a0491SDavid Ahern struct nexthop *nh_parent; /* nexthop of group with this entry */ 123430a0491SDavid Ahern }; 124430a0491SDavid Ahern 125430a0491SDavid Ahern struct nh_group { 12690f33bffSNikolay Aleksandrov struct nh_group *spare; /* spare group for removals */ 127430a0491SDavid Ahern u16 num_nh; 12890e1a9e2SPetr Machata bool is_multipath; 129de1d1ee3SPetr Machata bool hash_threshold; 130283a72a5SPetr Machata bool resilient; 131ce9ac056SDavid Ahern bool fdb_nh; 132430a0491SDavid Ahern bool has_v4; 133283a72a5SPetr Machata 134283a72a5SPetr Machata struct nh_res_table __rcu *res_table; 1352a92fccdSKees Cook struct nh_grp_entry nh_entries[] __counted_by(num_nh); 136430a0491SDavid Ahern }; 137430a0491SDavid Ahern 138ab84be7eSDavid Ahern struct nexthop { 139ab84be7eSDavid Ahern struct rb_node rb_node; /* entry on netns rbtree */ 1404c7e8084SDavid Ahern struct list_head fi_list; /* v4 entries using nh */ 141f88d8ea6SDavid Ahern struct list_head f6i_list; /* v6 entries using nh */ 14238428d68SRoopa Prabhu struct list_head fdb_list; /* fdb entries using this nh */ 143430a0491SDavid Ahern struct list_head grp_list; /* nh group entries using this nh */ 144ab84be7eSDavid Ahern struct net *net; 145ab84be7eSDavid Ahern 146ab84be7eSDavid Ahern u32 id; 147ab84be7eSDavid Ahern 148ab84be7eSDavid Ahern u8 protocol; /* app managing this nh */ 149ab84be7eSDavid Ahern u8 nh_flags; 150430a0491SDavid Ahern bool is_group; 151ab84be7eSDavid Ahern 152ab84be7eSDavid Ahern refcount_t refcnt; 153ab84be7eSDavid Ahern struct rcu_head rcu; 154ab84be7eSDavid Ahern 155ab84be7eSDavid Ahern union { 156ab84be7eSDavid Ahern struct nh_info __rcu *nh_info; 157430a0491SDavid Ahern struct nh_group __rcu *nh_grp; 158ab84be7eSDavid Ahern }; 159ab84be7eSDavid Ahern }; 160ab84be7eSDavid Ahern 1618590ceedSRoopa Prabhu enum nexthop_event_type { 162732d167bSIdo Schimmel NEXTHOP_EVENT_DEL, 163732d167bSIdo Schimmel NEXTHOP_EVENT_REPLACE, 164b8f090d0SIdo Schimmel NEXTHOP_EVENT_RES_TABLE_PRE_REPLACE, 165b8f090d0SIdo Schimmel NEXTHOP_EVENT_BUCKET_REPLACE, 1668590ceedSRoopa Prabhu }; 1678590ceedSRoopa Prabhu 16809ad6becSIdo Schimmel enum nh_notifier_info_type { 16909ad6becSIdo Schimmel NH_NOTIFIER_INFO_TYPE_SINGLE, 17009ad6becSIdo Schimmel NH_NOTIFIER_INFO_TYPE_GRP, 171b8f090d0SIdo Schimmel NH_NOTIFIER_INFO_TYPE_RES_TABLE, 172b8f090d0SIdo Schimmel NH_NOTIFIER_INFO_TYPE_RES_BUCKET, 17309ad6becSIdo Schimmel }; 17409ad6becSIdo Schimmel 1751c9cac65SIdo Schimmel struct nh_notifier_single_info { 1761c9cac65SIdo Schimmel struct net_device *dev; 1771c9cac65SIdo Schimmel u8 gw_family; 1781c9cac65SIdo Schimmel union { 1791c9cac65SIdo Schimmel __be32 ipv4; 1801c9cac65SIdo Schimmel struct in6_addr ipv6; 1811c9cac65SIdo Schimmel }; 1821c9cac65SIdo Schimmel u8 is_reject:1, 1831c9cac65SIdo Schimmel is_fdb:1, 1841c9cac65SIdo Schimmel has_encap:1; 1851c9cac65SIdo Schimmel }; 1861c9cac65SIdo Schimmel 1871c9cac65SIdo Schimmel struct nh_notifier_grp_entry_info { 1881c9cac65SIdo Schimmel u8 weight; 1891c9cac65SIdo Schimmel u32 id; 1901c9cac65SIdo Schimmel struct nh_notifier_single_info nh; 1911c9cac65SIdo Schimmel }; 1921c9cac65SIdo Schimmel 1931c9cac65SIdo Schimmel struct nh_notifier_grp_info { 1941c9cac65SIdo Schimmel u16 num_nh; 1951c9cac65SIdo Schimmel bool is_fdb; 196cf9ecad9SKees Cook struct nh_notifier_grp_entry_info nh_entries[] __counted_by(num_nh); 1971c9cac65SIdo Schimmel }; 1981c9cac65SIdo Schimmel 199b8f090d0SIdo Schimmel struct nh_notifier_res_bucket_info { 200b8f090d0SIdo Schimmel u16 bucket_index; 201b8f090d0SIdo Schimmel unsigned int idle_timer_ms; 202b8f090d0SIdo Schimmel bool force; 203b8f090d0SIdo Schimmel struct nh_notifier_single_info old_nh; 204b8f090d0SIdo Schimmel struct nh_notifier_single_info new_nh; 205b8f090d0SIdo Schimmel }; 206b8f090d0SIdo Schimmel 207b8f090d0SIdo Schimmel struct nh_notifier_res_table_info { 208b8f090d0SIdo Schimmel u16 num_nh_buckets; 2093e584e32SKees Cook struct nh_notifier_single_info nhs[] __counted_by(num_nh_buckets); 210b8f090d0SIdo Schimmel }; 211b8f090d0SIdo Schimmel 2121c9cac65SIdo Schimmel struct nh_notifier_info { 2131c9cac65SIdo Schimmel struct net *net; 2141c9cac65SIdo Schimmel struct netlink_ext_ack *extack; 2151c9cac65SIdo Schimmel u32 id; 21609ad6becSIdo Schimmel enum nh_notifier_info_type type; 2171c9cac65SIdo Schimmel union { 2181c9cac65SIdo Schimmel struct nh_notifier_single_info *nh; 2191c9cac65SIdo Schimmel struct nh_notifier_grp_info *nh_grp; 220b8f090d0SIdo Schimmel struct nh_notifier_res_table_info *nh_res_table; 221b8f090d0SIdo Schimmel struct nh_notifier_res_bucket_info *nh_res_bucket; 2221c9cac65SIdo Schimmel }; 2231c9cac65SIdo Schimmel }; 2241c9cac65SIdo Schimmel 225ce7e9c8aSIdo Schimmel int register_nexthop_notifier(struct net *net, struct notifier_block *nb, 226ce7e9c8aSIdo Schimmel struct netlink_ext_ack *extack); 22770f16ea2SEric Dumazet int __unregister_nexthop_notifier(struct net *net, struct notifier_block *nb); 2288590ceedSRoopa Prabhu int unregister_nexthop_notifier(struct net *net, struct notifier_block *nb); 229e95f2592SIdo Schimmel void nexthop_set_hw_flags(struct net *net, u32 id, bool offload, bool trap); 23056ad5ba3SIdo Schimmel void nexthop_bucket_set_hw_flags(struct net *net, u32 id, u16 bucket_index, 23156ad5ba3SIdo Schimmel bool offload, bool trap); 232cfc15c1dSIdo Schimmel void nexthop_res_grp_activity_update(struct net *net, u32 id, u16 num_buckets, 233cfc15c1dSIdo Schimmel unsigned long *activity); 2348590ceedSRoopa Prabhu 235ab84be7eSDavid Ahern /* caller is holding rcu or rtnl; no reference taken to nexthop */ 236ab84be7eSDavid Ahern struct nexthop *nexthop_find_by_id(struct net *net, u32 id); 237ab84be7eSDavid Ahern void nexthop_free_rcu(struct rcu_head *head); 238ab84be7eSDavid Ahern 239ab84be7eSDavid Ahern static inline bool nexthop_get(struct nexthop *nh) 240ab84be7eSDavid Ahern { 241ab84be7eSDavid Ahern return refcount_inc_not_zero(&nh->refcnt); 242ab84be7eSDavid Ahern } 243ab84be7eSDavid Ahern 244ab84be7eSDavid Ahern static inline void nexthop_put(struct nexthop *nh) 245ab84be7eSDavid Ahern { 246ab84be7eSDavid Ahern if (refcount_dec_and_test(&nh->refcnt)) 247ab84be7eSDavid Ahern call_rcu(&nh->rcu, nexthop_free_rcu); 248ab84be7eSDavid Ahern } 249ab84be7eSDavid Ahern 2504c7e8084SDavid Ahern static inline bool nexthop_cmp(const struct nexthop *nh1, 2514c7e8084SDavid Ahern const struct nexthop *nh2) 2524c7e8084SDavid Ahern { 2534c7e8084SDavid Ahern return nh1 == nh2; 2544c7e8084SDavid Ahern } 2554c7e8084SDavid Ahern 256ce9ac056SDavid Ahern static inline bool nexthop_is_fdb(const struct nexthop *nh) 257ce9ac056SDavid Ahern { 258ce9ac056SDavid Ahern if (nh->is_group) { 259ce9ac056SDavid Ahern const struct nh_group *nh_grp; 260ce9ac056SDavid Ahern 261ce9ac056SDavid Ahern nh_grp = rcu_dereference_rtnl(nh->nh_grp); 262ce9ac056SDavid Ahern return nh_grp->fdb_nh; 263ce9ac056SDavid Ahern } else { 264ce9ac056SDavid Ahern const struct nh_info *nhi; 265ce9ac056SDavid Ahern 266ce9ac056SDavid Ahern nhi = rcu_dereference_rtnl(nh->nh_info); 267ce9ac056SDavid Ahern return nhi->fdb_nh; 268ce9ac056SDavid Ahern } 269ce9ac056SDavid Ahern } 270ce9ac056SDavid Ahern 27150cb8769SDavid Ahern static inline bool nexthop_has_v4(const struct nexthop *nh) 27250cb8769SDavid Ahern { 27350cb8769SDavid Ahern if (nh->is_group) { 27450cb8769SDavid Ahern struct nh_group *nh_grp; 27550cb8769SDavid Ahern 27650cb8769SDavid Ahern nh_grp = rcu_dereference_rtnl(nh->nh_grp); 27750cb8769SDavid Ahern return nh_grp->has_v4; 27850cb8769SDavid Ahern } 27950cb8769SDavid Ahern return false; 28050cb8769SDavid Ahern } 28150cb8769SDavid Ahern 282430a0491SDavid Ahern static inline bool nexthop_is_multipath(const struct nexthop *nh) 283430a0491SDavid Ahern { 284430a0491SDavid Ahern if (nh->is_group) { 285430a0491SDavid Ahern struct nh_group *nh_grp; 286430a0491SDavid Ahern 287430a0491SDavid Ahern nh_grp = rcu_dereference_rtnl(nh->nh_grp); 28890e1a9e2SPetr Machata return nh_grp->is_multipath; 289430a0491SDavid Ahern } 290430a0491SDavid Ahern return false; 291430a0491SDavid Ahern } 292430a0491SDavid Ahern 293430a0491SDavid Ahern struct nexthop *nexthop_select_path(struct nexthop *nh, int hash); 294430a0491SDavid Ahern 295430a0491SDavid Ahern static inline unsigned int nexthop_num_path(const struct nexthop *nh) 296430a0491SDavid Ahern { 297430a0491SDavid Ahern unsigned int rc = 1; 298430a0491SDavid Ahern 2990b5e2e39SDavid Ahern if (nh->is_group) { 300430a0491SDavid Ahern struct nh_group *nh_grp; 301430a0491SDavid Ahern 302430a0491SDavid Ahern nh_grp = rcu_dereference_rtnl(nh->nh_grp); 30390e1a9e2SPetr Machata if (nh_grp->is_multipath) 304430a0491SDavid Ahern rc = nh_grp->num_nh; 305430a0491SDavid Ahern } 306430a0491SDavid Ahern 307430a0491SDavid Ahern return rc; 308430a0491SDavid Ahern } 309430a0491SDavid Ahern 310430a0491SDavid Ahern static inline 3110b5e2e39SDavid Ahern struct nexthop *nexthop_mpath_select(const struct nh_group *nhg, int nhsel) 312430a0491SDavid Ahern { 313430a0491SDavid Ahern /* for_nexthops macros in fib_semantics.c grabs a pointer to 314430a0491SDavid Ahern * the nexthop before checking nhsel 315430a0491SDavid Ahern */ 3165270041dSDan Carpenter if (nhsel >= nhg->num_nh) 317430a0491SDavid Ahern return NULL; 318430a0491SDavid Ahern 319430a0491SDavid Ahern return nhg->nh_entries[nhsel].nh; 320430a0491SDavid Ahern } 321430a0491SDavid Ahern 322430a0491SDavid Ahern static inline 3237bdf4de1SDonald Sharp int nexthop_mpath_fill_node(struct sk_buff *skb, struct nexthop *nh, 3247bdf4de1SDonald Sharp u8 rt_family) 325430a0491SDavid Ahern { 3260ac3fa0cSEric Dumazet struct nh_group *nhg = rcu_dereference_rtnl(nh->nh_grp); 327430a0491SDavid Ahern int i; 328430a0491SDavid Ahern 329430a0491SDavid Ahern for (i = 0; i < nhg->num_nh; i++) { 330430a0491SDavid Ahern struct nexthop *nhe = nhg->nh_entries[i].nh; 331430a0491SDavid Ahern struct nh_info *nhi = rcu_dereference_rtnl(nhe->nh_info); 332430a0491SDavid Ahern struct fib_nh_common *nhc = &nhi->fib_nhc; 333430a0491SDavid Ahern int weight = nhg->nh_entries[i].weight; 334430a0491SDavid Ahern 335597aa16cSXiao Liang if (fib_add_nexthop(skb, nhc, weight, rt_family, 0) < 0) 336430a0491SDavid Ahern return -EMSGSIZE; 337430a0491SDavid Ahern } 338430a0491SDavid Ahern 339430a0491SDavid Ahern return 0; 340430a0491SDavid Ahern } 341430a0491SDavid Ahern 342ab84be7eSDavid Ahern /* called with rcu lock */ 343ab84be7eSDavid Ahern static inline bool nexthop_is_blackhole(const struct nexthop *nh) 344ab84be7eSDavid Ahern { 345ab84be7eSDavid Ahern const struct nh_info *nhi; 346ab84be7eSDavid Ahern 3470b5e2e39SDavid Ahern if (nh->is_group) { 3480b5e2e39SDavid Ahern struct nh_group *nh_grp; 3490b5e2e39SDavid Ahern 3500b5e2e39SDavid Ahern nh_grp = rcu_dereference_rtnl(nh->nh_grp); 3510b5e2e39SDavid Ahern if (nh_grp->num_nh > 1) 352430a0491SDavid Ahern return false; 3530b5e2e39SDavid Ahern 3540b5e2e39SDavid Ahern nh = nh_grp->nh_entries[0].nh; 355430a0491SDavid Ahern } 356430a0491SDavid Ahern 357430a0491SDavid Ahern nhi = rcu_dereference_rtnl(nh->nh_info); 358ab84be7eSDavid Ahern return nhi->reject_nh; 359ab84be7eSDavid Ahern } 3605481d73fSDavid Ahern 3614c7e8084SDavid Ahern static inline void nexthop_path_fib_result(struct fib_result *res, int hash) 3624c7e8084SDavid Ahern { 3634c7e8084SDavid Ahern struct nh_info *nhi; 3644c7e8084SDavid Ahern struct nexthop *nh; 3654c7e8084SDavid Ahern 3664c7e8084SDavid Ahern nh = nexthop_select_path(res->fi->nh, hash); 3674c7e8084SDavid Ahern nhi = rcu_dereference(nh->nh_info); 3684c7e8084SDavid Ahern res->nhc = &nhi->fib_nhc; 3694c7e8084SDavid Ahern } 3704c7e8084SDavid Ahern 3714c7e8084SDavid Ahern /* called with rcu read lock or rtnl held */ 3724c7e8084SDavid Ahern static inline 3734c7e8084SDavid Ahern struct fib_nh_common *nexthop_fib_nhc(struct nexthop *nh, int nhsel) 3744c7e8084SDavid Ahern { 3754c7e8084SDavid Ahern struct nh_info *nhi; 3764c7e8084SDavid Ahern 3774c7e8084SDavid Ahern BUILD_BUG_ON(offsetof(struct fib_nh, nh_common) != 0); 3784c7e8084SDavid Ahern BUILD_BUG_ON(offsetof(struct fib6_nh, nh_common) != 0); 3794c7e8084SDavid Ahern 3800b5e2e39SDavid Ahern if (nh->is_group) { 3810b5e2e39SDavid Ahern struct nh_group *nh_grp; 3820b5e2e39SDavid Ahern 3830b5e2e39SDavid Ahern nh_grp = rcu_dereference_rtnl(nh->nh_grp); 38490e1a9e2SPetr Machata if (nh_grp->is_multipath) { 3850b5e2e39SDavid Ahern nh = nexthop_mpath_select(nh_grp, nhsel); 3864c7e8084SDavid Ahern if (!nh) 3874c7e8084SDavid Ahern return NULL; 3884c7e8084SDavid Ahern } 3890b5e2e39SDavid Ahern } 3904c7e8084SDavid Ahern 3914c7e8084SDavid Ahern nhi = rcu_dereference_rtnl(nh->nh_info); 3924c7e8084SDavid Ahern return &nhi->fib_nhc; 3934c7e8084SDavid Ahern } 3944c7e8084SDavid Ahern 395af7888adSDavid Ahern /* called from fib_table_lookup with rcu_lock */ 396af7888adSDavid Ahern static inline 397af7888adSDavid Ahern struct fib_nh_common *nexthop_get_nhc_lookup(const struct nexthop *nh, 398af7888adSDavid Ahern int fib_flags, 399af7888adSDavid Ahern const struct flowi4 *flp, 400af7888adSDavid Ahern int *nhsel) 401af7888adSDavid Ahern { 402af7888adSDavid Ahern struct nh_info *nhi; 403af7888adSDavid Ahern 404af7888adSDavid Ahern if (nh->is_group) { 405af7888adSDavid Ahern struct nh_group *nhg = rcu_dereference(nh->nh_grp); 406af7888adSDavid Ahern int i; 407af7888adSDavid Ahern 408af7888adSDavid Ahern for (i = 0; i < nhg->num_nh; i++) { 409af7888adSDavid Ahern struct nexthop *nhe = nhg->nh_entries[i].nh; 410af7888adSDavid Ahern 411af7888adSDavid Ahern nhi = rcu_dereference(nhe->nh_info); 412af7888adSDavid Ahern if (fib_lookup_good_nhc(&nhi->fib_nhc, fib_flags, flp)) { 413af7888adSDavid Ahern *nhsel = i; 414af7888adSDavid Ahern return &nhi->fib_nhc; 415af7888adSDavid Ahern } 416af7888adSDavid Ahern } 417af7888adSDavid Ahern } else { 418af7888adSDavid Ahern nhi = rcu_dereference(nh->nh_info); 419af7888adSDavid Ahern if (fib_lookup_good_nhc(&nhi->fib_nhc, fib_flags, flp)) { 420af7888adSDavid Ahern *nhsel = 0; 421af7888adSDavid Ahern return &nhi->fib_nhc; 422af7888adSDavid Ahern } 423af7888adSDavid Ahern } 424af7888adSDavid Ahern 425af7888adSDavid Ahern return NULL; 426af7888adSDavid Ahern } 427af7888adSDavid Ahern 4281fd1c768SDavid Ahern static inline bool nexthop_uses_dev(const struct nexthop *nh, 4291fd1c768SDavid Ahern const struct net_device *dev) 4301fd1c768SDavid Ahern { 4311fd1c768SDavid Ahern struct nh_info *nhi; 4321fd1c768SDavid Ahern 4331fd1c768SDavid Ahern if (nh->is_group) { 4341fd1c768SDavid Ahern struct nh_group *nhg = rcu_dereference(nh->nh_grp); 4351fd1c768SDavid Ahern int i; 4361fd1c768SDavid Ahern 4371fd1c768SDavid Ahern for (i = 0; i < nhg->num_nh; i++) { 4381fd1c768SDavid Ahern struct nexthop *nhe = nhg->nh_entries[i].nh; 4391fd1c768SDavid Ahern 4401fd1c768SDavid Ahern nhi = rcu_dereference(nhe->nh_info); 4411fd1c768SDavid Ahern if (nhc_l3mdev_matches_dev(&nhi->fib_nhc, dev)) 4421fd1c768SDavid Ahern return true; 4431fd1c768SDavid Ahern } 4441fd1c768SDavid Ahern } else { 4451fd1c768SDavid Ahern nhi = rcu_dereference(nh->nh_info); 4461fd1c768SDavid Ahern if (nhc_l3mdev_matches_dev(&nhi->fib_nhc, dev)) 4471fd1c768SDavid Ahern return true; 4481fd1c768SDavid Ahern } 4491fd1c768SDavid Ahern 4501fd1c768SDavid Ahern return false; 4511fd1c768SDavid Ahern } 4521fd1c768SDavid Ahern 4535481d73fSDavid Ahern static inline unsigned int fib_info_num_path(const struct fib_info *fi) 4545481d73fSDavid Ahern { 4554c7e8084SDavid Ahern if (unlikely(fi->nh)) 4564c7e8084SDavid Ahern return nexthop_num_path(fi->nh); 4574c7e8084SDavid Ahern 4585481d73fSDavid Ahern return fi->fib_nhs; 4595481d73fSDavid Ahern } 4605481d73fSDavid Ahern 4614c7e8084SDavid Ahern int fib_check_nexthop(struct nexthop *nh, u8 scope, 4624c7e8084SDavid Ahern struct netlink_ext_ack *extack); 4634c7e8084SDavid Ahern 4645481d73fSDavid Ahern static inline struct fib_nh_common *fib_info_nhc(struct fib_info *fi, int nhsel) 4655481d73fSDavid Ahern { 4664c7e8084SDavid Ahern if (unlikely(fi->nh)) 4674c7e8084SDavid Ahern return nexthop_fib_nhc(fi->nh, nhsel); 4684c7e8084SDavid Ahern 4695481d73fSDavid Ahern return &fi->fib_nh[nhsel].nh_common; 4705481d73fSDavid Ahern } 4715481d73fSDavid Ahern 4724c7e8084SDavid Ahern /* only used when fib_nh is built into fib_info */ 4735481d73fSDavid Ahern static inline struct fib_nh *fib_info_nh(struct fib_info *fi, int nhsel) 4745481d73fSDavid Ahern { 4754c7e8084SDavid Ahern WARN_ON(fi->nh); 4764c7e8084SDavid Ahern 4775481d73fSDavid Ahern return &fi->fib_nh[nhsel]; 4785481d73fSDavid Ahern } 479f88d8ea6SDavid Ahern 480f88d8ea6SDavid Ahern /* 481f88d8ea6SDavid Ahern * IPv6 variants 482f88d8ea6SDavid Ahern */ 483f88d8ea6SDavid Ahern int fib6_check_nexthop(struct nexthop *nh, struct fib6_config *cfg, 484f88d8ea6SDavid Ahern struct netlink_ext_ack *extack); 485f88d8ea6SDavid Ahern 48628259bacSWei Wang /* Caller should either hold rcu_read_lock(), or RTNL. */ 487f88d8ea6SDavid Ahern static inline struct fib6_nh *nexthop_fib6_nh(struct nexthop *nh) 488f88d8ea6SDavid Ahern { 489f88d8ea6SDavid Ahern struct nh_info *nhi; 490f88d8ea6SDavid Ahern 4910b5e2e39SDavid Ahern if (nh->is_group) { 4920b5e2e39SDavid Ahern struct nh_group *nh_grp; 4930b5e2e39SDavid Ahern 4940b5e2e39SDavid Ahern nh_grp = rcu_dereference_rtnl(nh->nh_grp); 4950b5e2e39SDavid Ahern nh = nexthop_mpath_select(nh_grp, 0); 496f88d8ea6SDavid Ahern if (!nh) 497f88d8ea6SDavid Ahern return NULL; 498f88d8ea6SDavid Ahern } 499f88d8ea6SDavid Ahern 500f88d8ea6SDavid Ahern nhi = rcu_dereference_rtnl(nh->nh_info); 501f88d8ea6SDavid Ahern if (nhi->family == AF_INET6) 502f88d8ea6SDavid Ahern return &nhi->fib6_nh; 503f88d8ea6SDavid Ahern 504f88d8ea6SDavid Ahern return NULL; 505f88d8ea6SDavid Ahern } 506f88d8ea6SDavid Ahern 507f88d8ea6SDavid Ahern static inline struct net_device *fib6_info_nh_dev(struct fib6_info *f6i) 508f88d8ea6SDavid Ahern { 509f88d8ea6SDavid Ahern struct fib6_nh *fib6_nh; 510f88d8ea6SDavid Ahern 511f88d8ea6SDavid Ahern fib6_nh = f6i->nh ? nexthop_fib6_nh(f6i->nh) : f6i->fib6_nh; 512f88d8ea6SDavid Ahern return fib6_nh->fib_nh_dev; 513f88d8ea6SDavid Ahern } 514f88d8ea6SDavid Ahern 515f88d8ea6SDavid Ahern static inline void nexthop_path_fib6_result(struct fib6_result *res, int hash) 516f88d8ea6SDavid Ahern { 517f88d8ea6SDavid Ahern struct nexthop *nh = res->f6i->nh; 518f88d8ea6SDavid Ahern struct nh_info *nhi; 519f88d8ea6SDavid Ahern 520f88d8ea6SDavid Ahern nh = nexthop_select_path(nh, hash); 521f88d8ea6SDavid Ahern 522f88d8ea6SDavid Ahern nhi = rcu_dereference_rtnl(nh->nh_info); 523f88d8ea6SDavid Ahern if (nhi->reject_nh) { 524f88d8ea6SDavid Ahern res->fib6_type = RTN_BLACKHOLE; 525f88d8ea6SDavid Ahern res->fib6_flags |= RTF_REJECT; 526f88d8ea6SDavid Ahern res->nh = nexthop_fib6_nh(nh); 527f88d8ea6SDavid Ahern } else { 528f88d8ea6SDavid Ahern res->nh = &nhi->fib6_nh; 529f88d8ea6SDavid Ahern } 530f88d8ea6SDavid Ahern } 531f88c9aa1SDavid Ahern 532f88c9aa1SDavid Ahern int nexthop_for_each_fib6_nh(struct nexthop *nh, 533f88c9aa1SDavid Ahern int (*cb)(struct fib6_nh *nh, void *arg), 534f88c9aa1SDavid Ahern void *arg); 53538428d68SRoopa Prabhu 53638428d68SRoopa Prabhu static inline int nexthop_get_family(struct nexthop *nh) 53738428d68SRoopa Prabhu { 53838428d68SRoopa Prabhu struct nh_info *nhi = rcu_dereference_rtnl(nh->nh_info); 53938428d68SRoopa Prabhu 54038428d68SRoopa Prabhu return nhi->family; 54138428d68SRoopa Prabhu } 54238428d68SRoopa Prabhu 54338428d68SRoopa Prabhu static inline 54438428d68SRoopa Prabhu struct fib_nh_common *nexthop_fdb_nhc(struct nexthop *nh) 54538428d68SRoopa Prabhu { 54638428d68SRoopa Prabhu struct nh_info *nhi = rcu_dereference_rtnl(nh->nh_info); 54738428d68SRoopa Prabhu 54838428d68SRoopa Prabhu return &nhi->fib_nhc; 54938428d68SRoopa Prabhu } 55038428d68SRoopa Prabhu 55138428d68SRoopa Prabhu static inline struct fib_nh_common *nexthop_path_fdb_result(struct nexthop *nh, 55238428d68SRoopa Prabhu int hash) 55338428d68SRoopa Prabhu { 55438428d68SRoopa Prabhu struct nh_info *nhi; 55538428d68SRoopa Prabhu struct nexthop *nhp; 55638428d68SRoopa Prabhu 55738428d68SRoopa Prabhu nhp = nexthop_select_path(nh, hash); 55838428d68SRoopa Prabhu if (unlikely(!nhp)) 55938428d68SRoopa Prabhu return NULL; 56038428d68SRoopa Prabhu nhi = rcu_dereference(nhp->nh_info); 56138428d68SRoopa Prabhu return &nhi->fib_nhc; 56238428d68SRoopa Prabhu } 563ab84be7eSDavid Ahern #endif 564