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513 lines
10 KiB
513 lines
10 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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/* |
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* Generic nexthop implementation |
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* |
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* Copyright (c) 2017-19 Cumulus Networks |
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* Copyright (c) 2017-19 David Ahern <[email protected]> |
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*/ |
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#ifndef __LINUX_NEXTHOP_H |
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#define __LINUX_NEXTHOP_H |
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#include <linux/netdevice.h> |
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#include <linux/notifier.h> |
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#include <linux/route.h> |
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#include <linux/types.h> |
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#include <net/ip_fib.h> |
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#include <net/ip6_fib.h> |
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#include <net/netlink.h> |
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#define NEXTHOP_VALID_USER_FLAGS RTNH_F_ONLINK |
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struct nexthop; |
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struct nh_config { |
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u32 nh_id; |
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u8 nh_family; |
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u8 nh_protocol; |
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u8 nh_blackhole; |
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u8 nh_fdb; |
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u32 nh_flags; |
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int nh_ifindex; |
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struct net_device *dev; |
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union { |
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__be32 ipv4; |
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struct in6_addr ipv6; |
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} gw; |
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struct nlattr *nh_grp; |
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u16 nh_grp_type; |
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struct nlattr *nh_encap; |
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u16 nh_encap_type; |
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u32 nlflags; |
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struct nl_info nlinfo; |
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}; |
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struct nh_info { |
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struct hlist_node dev_hash; /* entry on netns devhash */ |
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struct nexthop *nh_parent; |
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u8 family; |
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bool reject_nh; |
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bool fdb_nh; |
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union { |
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struct fib_nh_common fib_nhc; |
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struct fib_nh fib_nh; |
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struct fib6_nh fib6_nh; |
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}; |
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}; |
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struct nh_grp_entry { |
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struct nexthop *nh; |
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u8 weight; |
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union { |
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struct { |
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atomic_t upper_bound; |
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} mpath; |
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}; |
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struct list_head nh_list; |
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struct nexthop *nh_parent; /* nexthop of group with this entry */ |
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}; |
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struct nh_group { |
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struct nh_group *spare; /* spare group for removals */ |
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u16 num_nh; |
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bool mpath; |
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bool fdb_nh; |
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bool has_v4; |
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struct nh_grp_entry nh_entries[]; |
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}; |
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struct nexthop { |
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struct rb_node rb_node; /* entry on netns rbtree */ |
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struct list_head fi_list; /* v4 entries using nh */ |
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struct list_head f6i_list; /* v6 entries using nh */ |
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struct list_head fdb_list; /* fdb entries using this nh */ |
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struct list_head grp_list; /* nh group entries using this nh */ |
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struct net *net; |
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u32 id; |
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u8 protocol; /* app managing this nh */ |
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u8 nh_flags; |
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bool is_group; |
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refcount_t refcnt; |
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struct rcu_head rcu; |
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union { |
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struct nh_info __rcu *nh_info; |
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struct nh_group __rcu *nh_grp; |
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}; |
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}; |
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enum nexthop_event_type { |
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NEXTHOP_EVENT_DEL, |
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NEXTHOP_EVENT_REPLACE, |
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}; |
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enum nh_notifier_info_type { |
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NH_NOTIFIER_INFO_TYPE_SINGLE, |
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NH_NOTIFIER_INFO_TYPE_GRP, |
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}; |
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struct nh_notifier_single_info { |
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struct net_device *dev; |
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u8 gw_family; |
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union { |
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__be32 ipv4; |
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struct in6_addr ipv6; |
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}; |
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u8 is_reject:1, |
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is_fdb:1, |
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has_encap:1; |
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}; |
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struct nh_notifier_grp_entry_info { |
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u8 weight; |
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u32 id; |
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struct nh_notifier_single_info nh; |
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}; |
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struct nh_notifier_grp_info { |
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u16 num_nh; |
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bool is_fdb; |
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struct nh_notifier_grp_entry_info nh_entries[]; |
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}; |
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struct nh_notifier_info { |
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struct net *net; |
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struct netlink_ext_ack *extack; |
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u32 id; |
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enum nh_notifier_info_type type; |
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union { |
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struct nh_notifier_single_info *nh; |
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struct nh_notifier_grp_info *nh_grp; |
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}; |
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}; |
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int register_nexthop_notifier(struct net *net, struct notifier_block *nb, |
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struct netlink_ext_ack *extack); |
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int unregister_nexthop_notifier(struct net *net, struct notifier_block *nb); |
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void nexthop_set_hw_flags(struct net *net, u32 id, bool offload, bool trap); |
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/* caller is holding rcu or rtnl; no reference taken to nexthop */ |
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struct nexthop *nexthop_find_by_id(struct net *net, u32 id); |
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void nexthop_free_rcu(struct rcu_head *head); |
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static inline bool nexthop_get(struct nexthop *nh) |
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{ |
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return refcount_inc_not_zero(&nh->refcnt); |
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} |
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static inline void nexthop_put(struct nexthop *nh) |
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{ |
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if (refcount_dec_and_test(&nh->refcnt)) |
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call_rcu(&nh->rcu, nexthop_free_rcu); |
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} |
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static inline bool nexthop_cmp(const struct nexthop *nh1, |
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const struct nexthop *nh2) |
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{ |
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return nh1 == nh2; |
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} |
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static inline bool nexthop_is_fdb(const struct nexthop *nh) |
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{ |
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if (nh->is_group) { |
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const struct nh_group *nh_grp; |
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nh_grp = rcu_dereference_rtnl(nh->nh_grp); |
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return nh_grp->fdb_nh; |
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} else { |
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const struct nh_info *nhi; |
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nhi = rcu_dereference_rtnl(nh->nh_info); |
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return nhi->fdb_nh; |
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} |
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} |
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static inline bool nexthop_has_v4(const struct nexthop *nh) |
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{ |
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if (nh->is_group) { |
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struct nh_group *nh_grp; |
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nh_grp = rcu_dereference_rtnl(nh->nh_grp); |
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return nh_grp->has_v4; |
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} |
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return false; |
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} |
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static inline bool nexthop_is_multipath(const struct nexthop *nh) |
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{ |
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if (nh->is_group) { |
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struct nh_group *nh_grp; |
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nh_grp = rcu_dereference_rtnl(nh->nh_grp); |
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return nh_grp->mpath; |
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} |
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return false; |
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} |
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struct nexthop *nexthop_select_path(struct nexthop *nh, int hash); |
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static inline unsigned int nexthop_num_path(const struct nexthop *nh) |
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{ |
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unsigned int rc = 1; |
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if (nh->is_group) { |
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struct nh_group *nh_grp; |
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nh_grp = rcu_dereference_rtnl(nh->nh_grp); |
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if (nh_grp->mpath) |
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rc = nh_grp->num_nh; |
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} |
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return rc; |
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} |
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static inline |
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struct nexthop *nexthop_mpath_select(const struct nh_group *nhg, int nhsel) |
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{ |
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/* for_nexthops macros in fib_semantics.c grabs a pointer to |
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* the nexthop before checking nhsel |
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*/ |
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if (nhsel >= nhg->num_nh) |
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return NULL; |
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return nhg->nh_entries[nhsel].nh; |
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} |
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static inline |
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int nexthop_mpath_fill_node(struct sk_buff *skb, struct nexthop *nh, |
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u8 rt_family) |
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{ |
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struct nh_group *nhg = rtnl_dereference(nh->nh_grp); |
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int i; |
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for (i = 0; i < nhg->num_nh; i++) { |
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struct nexthop *nhe = nhg->nh_entries[i].nh; |
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struct nh_info *nhi = rcu_dereference_rtnl(nhe->nh_info); |
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struct fib_nh_common *nhc = &nhi->fib_nhc; |
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int weight = nhg->nh_entries[i].weight; |
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if (fib_add_nexthop(skb, nhc, weight, rt_family) < 0) |
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return -EMSGSIZE; |
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} |
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return 0; |
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} |
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/* called with rcu lock */ |
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static inline bool nexthop_is_blackhole(const struct nexthop *nh) |
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{ |
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const struct nh_info *nhi; |
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if (nh->is_group) { |
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struct nh_group *nh_grp; |
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nh_grp = rcu_dereference_rtnl(nh->nh_grp); |
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if (nh_grp->num_nh > 1) |
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return false; |
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nh = nh_grp->nh_entries[0].nh; |
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} |
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nhi = rcu_dereference_rtnl(nh->nh_info); |
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return nhi->reject_nh; |
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} |
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static inline void nexthop_path_fib_result(struct fib_result *res, int hash) |
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{ |
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struct nh_info *nhi; |
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struct nexthop *nh; |
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nh = nexthop_select_path(res->fi->nh, hash); |
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nhi = rcu_dereference(nh->nh_info); |
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res->nhc = &nhi->fib_nhc; |
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} |
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/* called with rcu read lock or rtnl held */ |
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static inline |
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struct fib_nh_common *nexthop_fib_nhc(struct nexthop *nh, int nhsel) |
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{ |
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struct nh_info *nhi; |
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BUILD_BUG_ON(offsetof(struct fib_nh, nh_common) != 0); |
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BUILD_BUG_ON(offsetof(struct fib6_nh, nh_common) != 0); |
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if (nh->is_group) { |
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struct nh_group *nh_grp; |
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nh_grp = rcu_dereference_rtnl(nh->nh_grp); |
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if (nh_grp->mpath) { |
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nh = nexthop_mpath_select(nh_grp, nhsel); |
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if (!nh) |
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return NULL; |
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} |
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} |
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nhi = rcu_dereference_rtnl(nh->nh_info); |
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return &nhi->fib_nhc; |
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} |
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/* called from fib_table_lookup with rcu_lock */ |
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static inline |
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struct fib_nh_common *nexthop_get_nhc_lookup(const struct nexthop *nh, |
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int fib_flags, |
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const struct flowi4 *flp, |
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int *nhsel) |
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{ |
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struct nh_info *nhi; |
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if (nh->is_group) { |
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struct nh_group *nhg = rcu_dereference(nh->nh_grp); |
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int i; |
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for (i = 0; i < nhg->num_nh; i++) { |
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struct nexthop *nhe = nhg->nh_entries[i].nh; |
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nhi = rcu_dereference(nhe->nh_info); |
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if (fib_lookup_good_nhc(&nhi->fib_nhc, fib_flags, flp)) { |
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*nhsel = i; |
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return &nhi->fib_nhc; |
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} |
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} |
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} else { |
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nhi = rcu_dereference(nh->nh_info); |
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if (fib_lookup_good_nhc(&nhi->fib_nhc, fib_flags, flp)) { |
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*nhsel = 0; |
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return &nhi->fib_nhc; |
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} |
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} |
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return NULL; |
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} |
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static inline bool nexthop_uses_dev(const struct nexthop *nh, |
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const struct net_device *dev) |
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{ |
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struct nh_info *nhi; |
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if (nh->is_group) { |
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struct nh_group *nhg = rcu_dereference(nh->nh_grp); |
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int i; |
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for (i = 0; i < nhg->num_nh; i++) { |
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struct nexthop *nhe = nhg->nh_entries[i].nh; |
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nhi = rcu_dereference(nhe->nh_info); |
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if (nhc_l3mdev_matches_dev(&nhi->fib_nhc, dev)) |
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return true; |
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} |
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} else { |
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nhi = rcu_dereference(nh->nh_info); |
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if (nhc_l3mdev_matches_dev(&nhi->fib_nhc, dev)) |
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return true; |
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} |
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return false; |
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} |
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static inline unsigned int fib_info_num_path(const struct fib_info *fi) |
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{ |
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if (unlikely(fi->nh)) |
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return nexthop_num_path(fi->nh); |
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return fi->fib_nhs; |
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} |
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int fib_check_nexthop(struct nexthop *nh, u8 scope, |
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struct netlink_ext_ack *extack); |
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static inline struct fib_nh_common *fib_info_nhc(struct fib_info *fi, int nhsel) |
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{ |
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if (unlikely(fi->nh)) |
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return nexthop_fib_nhc(fi->nh, nhsel); |
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return &fi->fib_nh[nhsel].nh_common; |
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} |
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/* only used when fib_nh is built into fib_info */ |
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static inline struct fib_nh *fib_info_nh(struct fib_info *fi, int nhsel) |
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{ |
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WARN_ON(fi->nh); |
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return &fi->fib_nh[nhsel]; |
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} |
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/* |
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* IPv6 variants |
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*/ |
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int fib6_check_nexthop(struct nexthop *nh, struct fib6_config *cfg, |
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struct netlink_ext_ack *extack); |
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/* Caller should either hold rcu_read_lock(), or RTNL. */ |
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static inline struct fib6_nh *nexthop_fib6_nh(struct nexthop *nh) |
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{ |
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struct nh_info *nhi; |
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if (nh->is_group) { |
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struct nh_group *nh_grp; |
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nh_grp = rcu_dereference_rtnl(nh->nh_grp); |
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nh = nexthop_mpath_select(nh_grp, 0); |
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if (!nh) |
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return NULL; |
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} |
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nhi = rcu_dereference_rtnl(nh->nh_info); |
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if (nhi->family == AF_INET6) |
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return &nhi->fib6_nh; |
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return NULL; |
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} |
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/* Variant of nexthop_fib6_nh(). |
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* Caller should either hold rcu_read_lock_bh(), or RTNL. |
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*/ |
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static inline struct fib6_nh *nexthop_fib6_nh_bh(struct nexthop *nh) |
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{ |
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struct nh_info *nhi; |
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if (nh->is_group) { |
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struct nh_group *nh_grp; |
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nh_grp = rcu_dereference_bh_rtnl(nh->nh_grp); |
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nh = nexthop_mpath_select(nh_grp, 0); |
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if (!nh) |
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return NULL; |
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} |
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nhi = rcu_dereference_bh_rtnl(nh->nh_info); |
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if (nhi->family == AF_INET6) |
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return &nhi->fib6_nh; |
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return NULL; |
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} |
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static inline struct net_device *fib6_info_nh_dev(struct fib6_info *f6i) |
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{ |
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struct fib6_nh *fib6_nh; |
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fib6_nh = f6i->nh ? nexthop_fib6_nh(f6i->nh) : f6i->fib6_nh; |
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return fib6_nh->fib_nh_dev; |
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} |
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static inline void nexthop_path_fib6_result(struct fib6_result *res, int hash) |
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{ |
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struct nexthop *nh = res->f6i->nh; |
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struct nh_info *nhi; |
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nh = nexthop_select_path(nh, hash); |
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nhi = rcu_dereference_rtnl(nh->nh_info); |
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if (nhi->reject_nh) { |
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res->fib6_type = RTN_BLACKHOLE; |
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res->fib6_flags |= RTF_REJECT; |
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res->nh = nexthop_fib6_nh(nh); |
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} else { |
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res->nh = &nhi->fib6_nh; |
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} |
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} |
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int nexthop_for_each_fib6_nh(struct nexthop *nh, |
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int (*cb)(struct fib6_nh *nh, void *arg), |
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void *arg); |
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static inline int nexthop_get_family(struct nexthop *nh) |
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{ |
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struct nh_info *nhi = rcu_dereference_rtnl(nh->nh_info); |
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return nhi->family; |
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} |
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static inline |
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struct fib_nh_common *nexthop_fdb_nhc(struct nexthop *nh) |
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{ |
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struct nh_info *nhi = rcu_dereference_rtnl(nh->nh_info); |
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return &nhi->fib_nhc; |
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} |
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static inline struct fib_nh_common *nexthop_path_fdb_result(struct nexthop *nh, |
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int hash) |
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{ |
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struct nh_info *nhi; |
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struct nexthop *nhp; |
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nhp = nexthop_select_path(nh, hash); |
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if (unlikely(!nhp)) |
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return NULL; |
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nhi = rcu_dereference(nhp->nh_info); |
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return &nhi->fib_nhc; |
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} |
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#endif
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