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5c5340108e
freebsd-dev/sys/netinet6/nd6.h
Alexander V. Chernikov c541bd368f lltable: Add support for "child" LLEs holding encap for IPv4oIPv6 entries. 
Currently we use pre-calculated headers inside LLE entries as prepend data
 for `if_output` functions. Using these headers allows saving some
 CPU cycles/memory accesses on the fast path.

However, this approach makes adding L2 header for IPv4 traffic with IPv6
 nexthops more complex, as it is not possible to store multiple
 pre-calculated headers inside lle. Additionally, the solution space is
 limited by the fact that PCB caching saves LLEs in addition to the nexthop.

Thus, add support for creating special "child" LLEs for the purpose of holding
 custom family encaps and store mbufs pending resolution. To simplify handling
 of those LLEs, store them in a linked-list inside a "parent" (e.g. normal) LLE.
 Such LLEs are not visible when iterating LLE table. Their lifecycle is bound
 to the "parent" LLE - it is not possible to delete "child" when parent is alive.
 Furthermore, "child" LLEs are static (RTF_STATIC), avoding complex state
 machine used by the standard LLEs.

nd6_lookup() and nd6_resolve() now accepts an additional argument, family,
 allowing to return such child LLEs. This change uses `LLE_SF()` macro which
 packs family and flags in a single int field. This is done to simplify merging
 back to stable/. Once this code lands, most of the cases will be converted to
 use a dedicated `family` parameter.

Differential Revision: https://reviews.freebsd.org/D31379
MFC after:	2 weeks
2021-08-21 17:34:35 +00:00

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/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
* All rights reserved.
*
* 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 project 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 PROJECT 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 PROJECT 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.
*
* $KAME: nd6.h,v 1.76 2001/12/18 02:10:31 itojun Exp $
* $FreeBSD$
*/
#ifndef _NETINET6_ND6_H_
#define _NETINET6_ND6_H_
/* see net/route.h, or net/if_inarp.h */
#ifndef RTF_ANNOUNCE
#define RTF_ANNOUNCE RTF_PROTO2
#endif
#include <sys/queue.h>
#include <sys/callout.h>
struct llentry;
#define ND6_LLINFO_NOSTATE -2
/*
* We don't need the WAITDELETE state any more, but we keep the definition
* in a comment line instead of removing it. This is necessary to avoid
* unintentionally reusing the value for another purpose, which might
* affect backward compatibility with old applications.
* (20000711 jinmei@kame.net)
*/
/* #define ND6_LLINFO_WAITDELETE -1 */
#define ND6_LLINFO_INCOMPLETE 0
#define ND6_LLINFO_REACHABLE 1
#define ND6_LLINFO_STALE 2
#define ND6_LLINFO_DELAY 3
#define ND6_LLINFO_PROBE 4
#define ND6_IS_LLINFO_PROBREACH(n) ((n)->ln_state > ND6_LLINFO_INCOMPLETE)
#define ND6_LLINFO_PERMANENT(n) (((n)->la_expire == 0) && ((n)->ln_state > ND6_LLINFO_INCOMPLETE))
struct nd_ifinfo {
u_int32_t linkmtu; /* LinkMTU */
u_int32_t maxmtu; /* Upper bound of LinkMTU */
u_int32_t basereachable; /* BaseReachableTime */
u_int32_t reachable; /* Reachable Time */
u_int32_t retrans; /* Retrans Timer */
u_int32_t flags; /* Flags */
int recalctm; /* BaseReacable re-calculation timer */
u_int8_t chlim; /* CurHopLimit */
u_int8_t initialized; /* Flag to see the entry is initialized */
/* the following 3 members are for privacy extension for addrconf */
u_int8_t randomseed0[8]; /* upper 64 bits of MD5 digest */
u_int8_t randomseed1[8]; /* lower 64 bits (usually the EUI64 IFID) */
u_int8_t randomid[8]; /* current random ID */
};
#define ND6_IFF_PERFORMNUD 0x1
#define ND6_IFF_ACCEPT_RTADV 0x2
#define ND6_IFF_PREFER_SOURCE 0x4 /* Not used in FreeBSD. */
#define ND6_IFF_IFDISABLED 0x8 /* IPv6 operation is disabled due to
* DAD failure. (XXX: not ND-specific)
*/
#define ND6_IFF_DONT_SET_IFROUTE 0x10
#define ND6_IFF_AUTO_LINKLOCAL 0x20
#define ND6_IFF_NO_RADR 0x40
#define ND6_IFF_NO_PREFER_IFACE 0x80 /* XXX: not related to ND. */
#define ND6_IFF_NO_DAD 0x100
#ifdef EXPERIMENTAL
/* XXX: not related to ND. */
#define ND6_IFF_IPV6_ONLY 0x200 /* draft-ietf-6man-ipv6only-flag */
#define ND6_IFF_IPV6_ONLY_MANUAL 0x400
#define ND6_IFF_IPV6_ONLY_MASK (ND6_IFF_IPV6_ONLY|ND6_IFF_IPV6_ONLY_MANUAL)
#endif
#ifdef _KERNEL
#define ND_IFINFO(ifp) \
(((struct in6_ifextra *)(ifp)->if_afdata[AF_INET6])->nd_ifinfo)
#define IN6_LINKMTU(ifp) \
((ND_IFINFO(ifp)->linkmtu && ND_IFINFO(ifp)->linkmtu < (ifp)->if_mtu) \
? ND_IFINFO(ifp)->linkmtu \
: ((ND_IFINFO(ifp)->maxmtu && ND_IFINFO(ifp)->maxmtu < (ifp)->if_mtu) \
? ND_IFINFO(ifp)->maxmtu : (ifp)->if_mtu))
#endif
struct in6_nbrinfo {
char ifname[IFNAMSIZ]; /* if name, e.g. "en0" */
struct in6_addr addr; /* IPv6 address of the neighbor */
long asked; /* number of queries already sent for this addr */
int isrouter; /* if it acts as a router */
int state; /* reachability state */
int expire; /* lifetime for NDP state transition */
};
/* Sysctls, shared with user space. */
struct in6_defrouter {
struct sockaddr_in6 rtaddr;
u_char flags;
u_short rtlifetime;
u_long expire;
u_short if_index;
};
struct in6_prefix {
struct sockaddr_in6 prefix;
struct prf_ra raflags;
u_char prefixlen;
u_char origin;
u_int32_t vltime;
u_int32_t pltime;
time_t expire;
u_int32_t flags;
int refcnt;
u_short if_index;
u_short advrtrs; /* number of advertisement routers */
/* struct sockaddr_in6 advrtr[] */
};
#ifdef _KERNEL
struct in6_ondireq {
char ifname[IFNAMSIZ];
struct {
u_int32_t linkmtu; /* LinkMTU */
u_int32_t maxmtu; /* Upper bound of LinkMTU */
u_int32_t basereachable; /* BaseReachableTime */
u_int32_t reachable; /* Reachable Time */
u_int32_t retrans; /* Retrans Timer */
u_int32_t flags; /* Flags */
int recalctm; /* BaseReacable re-calculation timer */
u_int8_t chlim; /* CurHopLimit */
u_int8_t receivedra;
} ndi;
};
#endif
struct in6_ndireq {
char ifname[IFNAMSIZ];
struct nd_ifinfo ndi;
};
struct in6_ndifreq {
char ifname[IFNAMSIZ];
u_long ifindex;
};
/* Prefix status */
#define NDPRF_ONLINK 0x1
#define NDPRF_DETACHED 0x2
/* protocol constants */
#define MAX_RTR_SOLICITATION_DELAY 1 /* 1sec */
#define RTR_SOLICITATION_INTERVAL 4 /* 4sec */
#define MAX_RTR_SOLICITATIONS 3
#define ND6_INFINITE_LIFETIME 0xffffffff
#ifdef _KERNEL
/* node constants */
#define MAX_REACHABLE_TIME 3600000 /* msec */
#define REACHABLE_TIME 30000 /* msec */
#define RETRANS_TIMER 1000 /* msec */
#define MIN_RANDOM_FACTOR 512 /* 1024 * 0.5 */
#define MAX_RANDOM_FACTOR 1536 /* 1024 * 1.5 */
#define DEF_TEMP_VALID_LIFETIME 604800 /* 1 week */
#define DEF_TEMP_PREFERRED_LIFETIME 86400 /* 1 day */
#define TEMPADDR_REGEN_ADVANCE 5 /* sec */
#define MAX_TEMP_DESYNC_FACTOR 600 /* 10 min */
#define ND_COMPUTE_RTIME(x) \
(((MIN_RANDOM_FACTOR * (x >> 10)) + (arc4random() & \
((MAX_RANDOM_FACTOR - MIN_RANDOM_FACTOR) * (x >> 10)))) /1000)
struct nd_defrouter {
TAILQ_ENTRY(nd_defrouter) dr_entry;
struct in6_addr rtaddr;
u_char raflags; /* flags on RA message */
u_short rtlifetime;
u_long expire;
struct ifnet *ifp;
int installed; /* is installed into kernel routing table */
u_int refcnt;
};
struct nd_prefixctl {
struct ifnet *ndpr_ifp;
/* prefix */
struct sockaddr_in6 ndpr_prefix;
u_char ndpr_plen;
u_int32_t ndpr_vltime; /* advertised valid lifetime */
u_int32_t ndpr_pltime; /* advertised preferred lifetime */
struct prf_ra ndpr_flags;
};
LIST_HEAD(nd_prhead, nd_prefix);
struct nd_prefix {
struct ifnet *ndpr_ifp;
LIST_ENTRY(nd_prefix) ndpr_entry;
struct sockaddr_in6 ndpr_prefix; /* prefix */
struct in6_addr ndpr_mask; /* netmask derived from the prefix */
u_int32_t ndpr_vltime; /* advertised valid lifetime */
u_int32_t ndpr_pltime; /* advertised preferred lifetime */
time_t ndpr_expire; /* expiration time of the prefix */
time_t ndpr_preferred; /* preferred time of the prefix */
time_t ndpr_lastupdate; /* reception time of last advertisement */
struct prf_ra ndpr_flags;
u_int32_t ndpr_stateflags; /* actual state flags */
/* list of routers that advertise the prefix: */
LIST_HEAD(pr_rtrhead, nd_pfxrouter) ndpr_advrtrs;
u_char ndpr_plen;
int ndpr_addrcnt; /* count of derived addresses */
volatile u_int ndpr_refcnt;
};
#define ndpr_raf ndpr_flags
#define ndpr_raf_onlink ndpr_flags.onlink
#define ndpr_raf_auto ndpr_flags.autonomous
#define ndpr_raf_router ndpr_flags.router
struct nd_pfxrouter {
LIST_ENTRY(nd_pfxrouter) pfr_entry;
struct nd_defrouter *router;
};
#ifdef MALLOC_DECLARE
MALLOC_DECLARE(M_IP6NDP);
#endif
/* nd6.c */
VNET_DECLARE(int, nd6_prune);
VNET_DECLARE(int, nd6_delay);
VNET_DECLARE(int, nd6_umaxtries);
VNET_DECLARE(int, nd6_mmaxtries);
VNET_DECLARE(int, nd6_useloopback);
VNET_DECLARE(int, nd6_maxnudhint);
VNET_DECLARE(int, nd6_gctimer);
VNET_DECLARE(struct nd_prhead, nd_prefix);
VNET_DECLARE(int, nd6_debug);
VNET_DECLARE(int, nd6_onlink_ns_rfc4861);
#define V_nd6_prune VNET(nd6_prune)
#define V_nd6_delay VNET(nd6_delay)
#define V_nd6_umaxtries VNET(nd6_umaxtries)
#define V_nd6_mmaxtries VNET(nd6_mmaxtries)
#define V_nd6_useloopback VNET(nd6_useloopback)
#define V_nd6_maxnudhint VNET(nd6_maxnudhint)
#define V_nd6_gctimer VNET(nd6_gctimer)
#define V_nd_prefix VNET(nd_prefix)
#define V_nd6_debug VNET(nd6_debug)
#define V_nd6_onlink_ns_rfc4861 VNET(nd6_onlink_ns_rfc4861)
/* Lock for the prefix and default router lists. */
VNET_DECLARE(struct rwlock, nd6_lock);
VNET_DECLARE(uint64_t, nd6_list_genid);
#define V_nd6_lock VNET(nd6_lock)
#define V_nd6_list_genid VNET(nd6_list_genid)
#define ND6_RLOCK() rw_rlock(&V_nd6_lock)
#define ND6_RUNLOCK() rw_runlock(&V_nd6_lock)
#define ND6_WLOCK() rw_wlock(&V_nd6_lock)
#define ND6_WUNLOCK() rw_wunlock(&V_nd6_lock)
#define ND6_TRY_UPGRADE() rw_try_upgrade(&V_nd6_lock)
#define ND6_WLOCK_ASSERT() rw_assert(&V_nd6_lock, RA_WLOCKED)
#define ND6_RLOCK_ASSERT() rw_assert(&V_nd6_lock, RA_RLOCKED)
#define ND6_LOCK_ASSERT() rw_assert(&V_nd6_lock, RA_LOCKED)
#define ND6_UNLOCK_ASSERT() rw_assert(&V_nd6_lock, RA_UNLOCKED)
/* Mutex for prefix onlink/offlink transitions. */
VNET_DECLARE(struct mtx, nd6_onlink_mtx);
#define V_nd6_onlink_mtx VNET(nd6_onlink_mtx)
#define ND6_ONLINK_LOCK() mtx_lock(&V_nd6_onlink_mtx)
#define ND6_ONLINK_TRYLOCK() mtx_trylock(&V_nd6_onlink_mtx)
#define ND6_ONLINK_UNLOCK() mtx_unlock(&V_nd6_onlink_mtx)
#define ND6_ONLINK_LOCK_ASSERT() mtx_assert(&V_nd6_onlink_mtx, MA_OWNED)
#define ND6_ONLINK_UNLOCK_ASSERT() mtx_assert(&V_nd6_onlink_mtx, MA_NOTOWNED)
#define nd6log(x) do { if (V_nd6_debug) log x; } while (/*CONSTCOND*/ 0)
/* nd6_rtr.c */
VNET_DECLARE(int, nd6_defifindex);
VNET_DECLARE(int, ip6_desync_factor); /* seconds */
VNET_DECLARE(u_int32_t, ip6_temp_preferred_lifetime); /* seconds */
VNET_DECLARE(u_int32_t, ip6_temp_valid_lifetime); /* seconds */
VNET_DECLARE(int, ip6_temp_regen_advance); /* seconds */
#define V_nd6_defifindex VNET(nd6_defifindex)
#define V_ip6_desync_factor VNET(ip6_desync_factor)
#define V_ip6_temp_preferred_lifetime VNET(ip6_temp_preferred_lifetime)
#define V_ip6_temp_valid_lifetime VNET(ip6_temp_valid_lifetime)
#define V_ip6_temp_regen_advance VNET(ip6_temp_regen_advance)
union nd_opts {
struct nd_opt_hdr *nd_opt_array[16]; /* max = ND_OPT_NONCE */
struct {
struct nd_opt_hdr *zero;
struct nd_opt_hdr *src_lladdr;
struct nd_opt_hdr *tgt_lladdr;
struct nd_opt_prefix_info *pi_beg; /* multiple opts, start */
struct nd_opt_rd_hdr *rh;
struct nd_opt_mtu *mtu;
struct nd_opt_hdr *__res6;
struct nd_opt_hdr *__res7;
struct nd_opt_hdr *__res8;
struct nd_opt_hdr *__res9;
struct nd_opt_hdr *__res10;
struct nd_opt_hdr *__res11;
struct nd_opt_hdr *__res12;
struct nd_opt_hdr *__res13;
struct nd_opt_nonce *nonce;
struct nd_opt_hdr *__res15;
struct nd_opt_hdr *search; /* multiple opts */
struct nd_opt_hdr *last; /* multiple opts */
int done;
struct nd_opt_prefix_info *pi_end;/* multiple opts, end */
} nd_opt_each;
};
#define nd_opts_src_lladdr nd_opt_each.src_lladdr
#define nd_opts_tgt_lladdr nd_opt_each.tgt_lladdr
#define nd_opts_pi nd_opt_each.pi_beg
#define nd_opts_pi_end nd_opt_each.pi_end
#define nd_opts_rh nd_opt_each.rh
#define nd_opts_mtu nd_opt_each.mtu
#define nd_opts_nonce nd_opt_each.nonce
#define nd_opts_search nd_opt_each.search
#define nd_opts_last nd_opt_each.last
#define nd_opts_done nd_opt_each.done
/* XXX: need nd6_var.h?? */
/* nd6.c */
void nd6_init(void);
#ifdef VIMAGE
void nd6_destroy(void);
#endif
struct nd_ifinfo *nd6_ifattach(struct ifnet *);
void nd6_ifdetach(struct ifnet *, struct nd_ifinfo *);
int nd6_is_addr_neighbor(const struct sockaddr_in6 *, struct ifnet *);
void nd6_option_init(void *, int, union nd_opts *);
struct nd_opt_hdr *nd6_option(union nd_opts *);
int nd6_options(union nd_opts *);
struct llentry *nd6_lookup(const struct in6_addr *, int, struct ifnet *);
void nd6_setmtu(struct ifnet *);
void nd6_llinfo_setstate(struct llentry *lle, int newstate);
void nd6_timer(void *);
void nd6_purge(struct ifnet *);
int nd6_resolve_addr(struct ifnet *ifp, int flags, const struct sockaddr *dst,
char *desten, uint32_t *pflags);
int nd6_resolve(struct ifnet *, int, struct mbuf *,
const struct sockaddr *, u_char *, uint32_t *, struct llentry **);
int nd6_ioctl(u_long, caddr_t, struct ifnet *);
void nd6_cache_lladdr(struct ifnet *, struct in6_addr *,
char *, int, int, int);
bool nd6_try_set_entry_addr(struct ifnet *ifp, struct llentry *lle, char *lladdr);
struct mbuf *nd6_grab_holdchain(struct llentry *);
int nd6_flush_holdchain(struct ifnet *, struct llentry *, struct mbuf *);
void nd6_flush_children_holdchain(struct ifnet *, struct llentry *);
int nd6_add_ifa_lle(struct in6_ifaddr *);
void nd6_rem_ifa_lle(struct in6_ifaddr *, int);
int nd6_output_ifp(struct ifnet *, struct ifnet *, struct mbuf *,
struct sockaddr_in6 *, struct route *);
struct rib_head;
struct rib_cmd_info;
void nd6_subscription_cb(struct rib_head *rnh, struct rib_cmd_info *rc,
void *arg);
/* nd6_nbr.c */
void nd6_na_input(struct mbuf *, int, int);
void nd6_na_output(struct ifnet *, const struct in6_addr *,
const struct in6_addr *, u_long, int, struct sockaddr *);
void nd6_ns_input(struct mbuf *, int, int);
void nd6_ns_output(struct ifnet *, const struct in6_addr *,
const struct in6_addr *, const struct in6_addr *, uint8_t *);
caddr_t nd6_ifptomac(struct ifnet *);
void nd6_dad_init(void);
void nd6_dad_start(struct ifaddr *, int);
void nd6_dad_stop(struct ifaddr *);
/* nd6_rtr.c */
void nd6_rs_input(struct mbuf *, int, int);
void nd6_ra_input(struct mbuf *, int, int);
void nd6_ifnet_link_event(void *, struct ifnet *, int);
struct nd_defrouter *defrouter_lookup(const struct in6_addr *, struct ifnet *);
struct nd_defrouter *defrouter_lookup_locked(const struct in6_addr *,
struct ifnet *);
void defrouter_reset(void);
void defrouter_select_fib(int fibnum);
void defrouter_rele(struct nd_defrouter *);
bool defrouter_remove(struct in6_addr *, struct ifnet *);
bool nd6_defrouter_list_empty(void);
void nd6_defrouter_flush_all(void);
void nd6_defrouter_purge(struct ifnet *);
void nd6_defrouter_timer(void);
void nd6_defrouter_init(void);
int nd6_prelist_add(struct nd_prefixctl *, struct nd_defrouter *,
struct nd_prefix **);
void nd6_prefix_unlink(struct nd_prefix *, struct nd_prhead *);
void nd6_prefix_del(struct nd_prefix *);
void nd6_prefix_ref(struct nd_prefix *);
void nd6_prefix_rele(struct nd_prefix *);
int nd6_prefix_offlink(struct nd_prefix *);
void pfxlist_onlink_check(void);
struct nd_prefix *nd6_prefix_lookup(struct nd_prefixctl *);
void rt6_flush(struct in6_addr *, struct ifnet *);
int nd6_setdefaultiface(int);
int in6_tmpifadd(const struct in6_ifaddr *, int, int);
#endif /* _KERNEL */
#endif /* _NETINET6_ND6_H_ */
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