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freebsd-dev/sys/net/route/route_var.h
Alexander V. Chernikov fe05d1dd0f routing: extend nhop(9) kpi 
* add nhop_get_unlinked() used to prepare referenced but not
 linked nexthop, that can later be used as a clone source.
* add nhop_check_gateway() to check for allowed address family
  combinations between the rib family and neighbor family (useful
  for 4o6 or direct routes)
* add nhop_set_upper_family() to allow copying IPv6 nexthops to
 IPv4 rib.
* add rt_get_rnd() wrapper, returning both nexthop/group and its
 weight attached to the rtentry.
* Add CHT_SLIST_FOREACH_SAFE(), allowing to delete items during
  iteration.

MFC after:	2 weeks
2022-08-29 14:46:03 +00:00

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/*-
* Copyright (c) 2015-2016
* Alexander V. Chernikov <melifaro@FreeBSD.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#ifndef _NET_ROUTE_VAR_H_
#define _NET_ROUTE_VAR_H_
#ifndef RNF_NORMAL
#include <net/radix.h>
#endif
#include <sys/ck.h>
#include <sys/epoch.h>
#include <netinet/in.h> /* struct sockaddr_in */
#include <sys/counter.h>
#include <net/route/nhop.h>
struct nh_control;
/* Sets prefix-specific nexthop flags (NHF_DEFAULT, RTF/NHF_HOST, RTF_BROADCAST,..) */
typedef int rnh_set_nh_pfxflags_f_t(u_int fibnum, const struct sockaddr *addr,
const struct sockaddr *mask, struct nhop_object *nh);
/* Fills in family-specific details that are not yet set up (mtu, nhop type, ..) */
typedef int rnh_augment_nh_f_t(u_int fibnum, struct nhop_object *nh);
struct rib_head {
struct radix_head head;
rn_matchaddr_f_t *rnh_matchaddr; /* longest match for sockaddr */
rn_addaddr_f_t *rnh_addaddr; /* add based on sockaddr*/
rn_deladdr_f_t *rnh_deladdr; /* remove based on sockaddr */
rn_lookup_f_t *rnh_lookup; /* exact match for sockaddr */
rn_walktree_t *rnh_walktree; /* traverse tree */
rn_walktree_from_t *rnh_walktree_from; /* traverse tree below a */
rnh_set_nh_pfxflags_f_t *rnh_set_nh_pfxflags; /* hook to alter record prior to insertion */
rt_gen_t rnh_gen; /* datapath generation counter */
int rnh_multipath; /* multipath capable ? */
struct radix_node rnh_nodes[3]; /* empty tree for common case */
struct rmlock rib_lock; /* config/data path lock */
struct radix_mask_head rmhead; /* masks radix head */
struct vnet *rib_vnet; /* vnet pointer */
int rib_family; /* AF of the rtable */
u_int rib_fibnum; /* fib number */
struct callout expire_callout; /* Callout for expiring dynamic routes */
time_t next_expire; /* Next expire run ts */
uint32_t rnh_prefixes; /* Number of prefixes */
rt_gen_t rnh_gen_rib; /* fib algo: rib generation counter */
uint32_t rib_dying:1; /* rib is detaching */
uint32_t rib_algo_fixed:1;/* fixed algorithm */
uint32_t rib_algo_init:1;/* algo init done */
struct nh_control *nh_control; /* nexthop subsystem data */
rnh_augment_nh_f_t *rnh_augment_nh;/* hook to alter nexthop prior to insertion */
CK_STAILQ_HEAD(, rib_subscription) rnh_subscribers;/* notification subscribers */
};
#define RIB_RLOCK_TRACKER struct rm_priotracker _rib_tracker
#define RIB_LOCK_INIT(rh) rm_init_flags(&(rh)->rib_lock, "rib head lock", RM_DUPOK)
#define RIB_LOCK_DESTROY(rh) rm_destroy(&(rh)->rib_lock)
#define RIB_RLOCK(rh) rm_rlock(&(rh)->rib_lock, &_rib_tracker)
#define RIB_RUNLOCK(rh) rm_runlock(&(rh)->rib_lock, &_rib_tracker)
#define RIB_WLOCK(rh) rm_wlock(&(rh)->rib_lock)
#define RIB_WUNLOCK(rh) rm_wunlock(&(rh)->rib_lock)
#define RIB_LOCK_ASSERT(rh) rm_assert(&(rh)->rib_lock, RA_LOCKED)
#define RIB_WLOCK_ASSERT(rh) rm_assert(&(rh)->rib_lock, RA_WLOCKED)
/* Constants */
#define RIB_MAX_RETRIES 3
#define RT_MAXFIBS UINT16_MAX
#define RIB_MAX_MPATH_WIDTH 64
/* Macro for verifying fields in af-specific 'struct route' structures */
#define CHK_STRUCT_FIELD_GENERIC(_s1, _f1, _s2, _f2) \
_Static_assert(sizeof(((_s1 *)0)->_f1) == sizeof(((_s2 *)0)->_f2), \
"Fields " #_f1 " and " #_f2 " size differs"); \
_Static_assert(__offsetof(_s1, _f1) == __offsetof(_s2, _f2), \
"Fields " #_f1 " and " #_f2 " offset differs");
#define _CHK_ROUTE_FIELD(_route_new, _field) \
CHK_STRUCT_FIELD_GENERIC(struct route, _field, _route_new, _field)
#define CHK_STRUCT_ROUTE_FIELDS(_route_new) \
_CHK_ROUTE_FIELD(_route_new, ro_nh) \
_CHK_ROUTE_FIELD(_route_new, ro_lle) \
_CHK_ROUTE_FIELD(_route_new, ro_prepend)\
_CHK_ROUTE_FIELD(_route_new, ro_plen) \
_CHK_ROUTE_FIELD(_route_new, ro_flags) \
_CHK_ROUTE_FIELD(_route_new, ro_mtu) \
_CHK_ROUTE_FIELD(_route_new, spare)
#define CHK_STRUCT_ROUTE_COMPAT(_ro_new, _dst_new) \
CHK_STRUCT_ROUTE_FIELDS(_ro_new); \
_Static_assert(__offsetof(struct route, ro_dst) == __offsetof(_ro_new, _dst_new),\
"ro_dst and " #_dst_new " are at different offset")
static inline void
rib_bump_gen(struct rib_head *rnh)
{
#ifdef FIB_ALGO
rnh->rnh_gen_rib++;
#else
rnh->rnh_gen++;
#endif
}
struct rib_head *rt_tables_get_rnh(uint32_t table, sa_family_t family);
int rt_getifa_fib(struct rt_addrinfo *info, u_int fibnum);
struct rib_cmd_info;
VNET_PCPUSTAT_DECLARE(struct rtstat, rtstat);
#define RTSTAT_ADD(name, val) \
VNET_PCPUSTAT_ADD(struct rtstat, rtstat, name, (val))
#define RTSTAT_INC(name) RTSTAT_ADD(name, 1)
/*
* Convert a 'struct radix_node *' to a 'struct rtentry *'.
* The operation can be done safely (in this code) because a
* 'struct rtentry' starts with two 'struct radix_node''s, the first
* one representing leaf nodes in the routing tree, which is
* what the code in radix.c passes us as a 'struct radix_node'.
*
* But because there are a lot of assumptions in this conversion,
* do not cast explicitly, but always use the macro below.
*/
#define RNTORT(p) ((struct rtentry *)(p))
struct rtentry {
struct radix_node rt_nodes[2]; /* tree glue, and other values */
/*
* XXX struct rtentry must begin with a struct radix_node (or two!)
* because the code does some casts of a 'struct radix_node *'
* to a 'struct rtentry *'
*/
#define rt_key(r) (*((struct sockaddr **)(&(r)->rt_nodes->rn_key)))
#define rt_mask(r) (*((struct sockaddr **)(&(r)->rt_nodes->rn_mask)))
#define rt_key_const(r) (*((const struct sockaddr * const *)(&(r)->rt_nodes->rn_key)))
#define rt_mask_const(r) (*((const struct sockaddr * const *)(&(r)->rt_nodes->rn_mask)))
/*
* 2 radix_node structurs above consists of 2x6 pointers, leaving
* 4 pointers (32 bytes) of the second cache line on amd64.
*
*/
struct nhop_object *rt_nhop; /* nexthop data */
union {
/*
* Destination address storage.
* sizeof(struct sockaddr_in6) == 28, however
* the dataplane-relevant part (e.g. address) lies
* at offset 8..24, making the address not crossing
* cacheline boundary.
*/
struct sockaddr_in rt_dst4;
struct sockaddr_in6 rt_dst6;
struct sockaddr rt_dst;
char rt_dstb[28];
};
int rte_flags; /* up/down?, host/net */
u_long rt_weight; /* absolute weight */
struct rtentry *rt_chain; /* pointer to next rtentry to delete */
struct epoch_context rt_epoch_ctx; /* net epoch tracker */
};
/*
* With the split between the routing entry and the nexthop,
* rt_flags has to be split between these 2 entries. As rtentry
* mostly contains prefix data and is thought to be generic enough
* so one can transparently change the nexthop pointer w/o requiring
* any other rtentry changes, most of rt_flags shifts to the particular nexthop.
* /
*
* RTF_UP: rtentry, as an indication that it is linked.
* RTF_HOST: rtentry, nhop. The latter indication is needed for the datapath
* RTF_DYNAMIC: nhop, to make rtentry generic.
* RTF_MODIFIED: nhop, to make rtentry generic. (legacy)
* -- "native" path (nhop) properties:
* RTF_GATEWAY, RTF_STATIC, RTF_PROTO1, RTF_PROTO2, RTF_PROTO3, RTF_FIXEDMTU,
* RTF_PINNED, RTF_REJECT, RTF_BLACKHOLE, RTF_BROADCAST
*/
/* rtentry rt flag mask */
#define RTE_RT_FLAG_MASK (RTF_UP | RTF_HOST)
/* route_temporal.c */
void tmproutes_update(struct rib_head *rnh, struct rtentry *rt, struct nhop_object *nh);
void tmproutes_init(struct rib_head *rh);
void tmproutes_destroy(struct rib_head *rh);
/* route_ctl.c */
struct route_nhop_data;
int change_route(struct rib_head *rnh, struct rtentry *rt,
struct route_nhop_data *rnd, struct rib_cmd_info *rc);
int change_route_conditional(struct rib_head *rnh, struct rtentry *rt,
struct route_nhop_data *nhd_orig, struct route_nhop_data *nhd_new,
struct rib_cmd_info *rc);
struct rtentry *lookup_prefix(struct rib_head *rnh,
const struct rt_addrinfo *info, struct route_nhop_data *rnd);
struct rtentry *lookup_prefix_rt(struct rib_head *rnh, const struct rtentry *rt,
struct route_nhop_data *rnd);
int rib_copy_route(struct rtentry *rt, const struct route_nhop_data *rnd_src,
struct rib_head *rh_dst, struct rib_cmd_info *rc);
bool nhop_can_multipath(const struct nhop_object *nh);
bool match_nhop_gw(const struct nhop_object *nh, const struct sockaddr *gw);
int check_info_match_nhop(const struct rt_addrinfo *info,
const struct rtentry *rt, const struct nhop_object *nh);
bool rib_can_4o6_nhop(void);
/* route_rtentry.c */
void vnet_rtzone_init(void);
void vnet_rtzone_destroy(void);
void rt_free(struct rtentry *rt);
void rt_free_immediate(struct rtentry *rt);
struct rtentry *rt_alloc(struct rib_head *rnh, const struct sockaddr *dst,
struct sockaddr *netmask);
/* subscriptions */
void rib_init_subscriptions(struct rib_head *rnh);
void rib_destroy_subscriptions(struct rib_head *rnh);
/* route_ifaddrs.c */
void rib_copy_kernel_routes(struct rib_head *rh_src, struct rib_head *rh_dst);
/* Nexhops */
void nhops_init(void);
int nhops_init_rib(struct rib_head *rh);
void nhops_destroy_rib(struct rib_head *rh);
void nhop_ref_object(struct nhop_object *nh);
int nhop_try_ref_object(struct nhop_object *nh);
void nhop_ref_any(struct nhop_object *nh);
void nhop_free_any(struct nhop_object *nh);
struct nhop_object *nhop_get_nhop_internal(struct rib_head *rnh,
struct nhop_object *nh, int *perror);
bool nhop_check_gateway(int upper_family, int neigh_family);
int nhop_create_from_info(struct rib_head *rnh, struct rt_addrinfo *info,
struct nhop_object **nh_ret);
int nhop_create_from_nhop(struct rib_head *rnh, const struct nhop_object *nh_orig,
struct rt_addrinfo *info, struct nhop_object **pnh_priv);
void nhops_update_ifmtu(struct rib_head *rh, struct ifnet *ifp, uint32_t mtu);
int nhops_dump_sysctl(struct rib_head *rh, struct sysctl_req *w);
/* MULTIPATH */
#define MPF_MULTIPATH 0x08 /* need to be consistent with NHF_MULTIPATH */
struct nhgrp_object {
uint16_t nhg_flags; /* nexthop group flags */
uint8_t nhg_size; /* dataplain group size */
uint8_t spare;
struct nhop_object *nhops[0]; /* nhops */
};
static inline struct nhop_object *
nhop_select(struct nhop_object *nh, uint32_t flowid)
{
#ifdef ROUTE_MPATH
if (NH_IS_NHGRP(nh)) {
struct nhgrp_object *nhg = (struct nhgrp_object *)nh;
nh = nhg->nhops[flowid % nhg->nhg_size];
}
#endif
return (nh);
}
struct weightened_nhop;
/* mpath_ctl.c */
int add_route_mpath(struct rib_head *rnh, struct rt_addrinfo *info,
struct rtentry *rt, struct route_nhop_data *rnd_add,
struct route_nhop_data *rnd_orig, struct rib_cmd_info *rc);
/* nhgrp.c */
int nhgrp_ctl_init(struct nh_control *ctl);
void nhgrp_ctl_free(struct nh_control *ctl);
void nhgrp_ctl_unlink_all(struct nh_control *ctl);
/* nhgrp_ctl.c */
int nhgrp_dump_sysctl(struct rib_head *rh, struct sysctl_req *w);
int nhgrp_get_filtered_group(struct rib_head *rh, const struct rtentry *rt,
const struct nhgrp_object *src, rib_filter_f_t flt_func, void *flt_data,
struct route_nhop_data *rnd);
int nhgrp_get_addition_group(struct rib_head *rnh,
struct route_nhop_data *rnd_orig, struct route_nhop_data *rnd_add,
struct route_nhop_data *rnd_new);
void nhgrp_ref_object(struct nhgrp_object *nhg);
uint32_t nhgrp_get_idx(const struct nhgrp_object *nhg);
void nhgrp_free(struct nhgrp_object *nhg);
/* rtsock */
int rtsock_routemsg(int cmd, struct rtentry *rt, struct nhop_object *nh,
int fibnum);
int rtsock_routemsg_info(int cmd, struct rt_addrinfo *info, int fibnum);
int rtsock_addrmsg(int cmd, struct ifaddr *ifa, int fibnum);
/* lookup_framework.c */
void fib_grow_rtables(uint32_t new_num_tables);
void fib_setup_family(int family, uint32_t num_tables);
void fib_destroy_rib(struct rib_head *rh);
void vnet_fib_init(void);
void vnet_fib_destroy(void);
/* Entropy data used for outbound hashing */
#define MPATH_ENTROPY_KEY_LEN 40
extern uint8_t mpath_entropy_key[MPATH_ENTROPY_KEY_LEN];
#endif
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