2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2020 Alexander V. Chernikov
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 #include <sys/cdefs.h>
29 __FBSDID("$FreeBSD$");
31 #include "opt_route.h"
33 #include <sys/param.h>
34 #include <sys/systm.h>
36 #include <sys/rwlock.h>
37 #include <sys/malloc.h>
38 #include <sys/socket.h>
39 #include <sys/sysctl.h>
40 #include <sys/kernel.h>
41 #include <sys/epoch.h>
44 #include <net/if_var.h>
45 #include <net/if_dl.h>
46 #include <net/route.h>
47 #include <net/route/route_ctl.h>
48 #include <net/route/route_var.h>
49 #include <net/route/nhop_utils.h>
50 #include <net/route/nhop.h>
51 #include <net/route/nhop_var.h>
55 * This file contains core functionality for the nexthop ("nhop") route subsystem.
56 * The business logic needed to create nexhop objects is implemented here.
58 * Nexthops in the original sense are the objects containing all the necessary
59 * information to forward the packet to the selected destination.
60 * In particular, nexthop is defined by a combination of
61 * ifp, ifa, aifp, mtu, gw addr(if set), nh_type, nh_family, mask of rt_flags and
64 * Additionally, each nexthop gets assigned its unique index (nexthop index).
65 * It serves two purposes: first one is to ease the ability of userland programs to
66 * reference nexthops by their index. The second one allows lookup algorithms to
67 * to store index instead of pointer (2 bytes vs 8) as a lookup result.
68 * All nexthops are stored in the resizable hash table.
70 * Basically, this file revolves around supporting 3 functions:
71 * 1) nhop_create_from_info / nhop_create_from_nhop, which contains all
72 * business logic on filling the nexthop fields based on the provided request.
73 * 2) nhop_get(), which gets a usable referenced nexthops.
76 * 1) non-exported functions start with verb
77 * 2) exported function starts with the subsystem prefix: "nhop"
80 static int dump_nhop_entry(struct rib_head *rh, struct nhop_object *nh, struct sysctl_req *w);
82 static struct nhop_priv *alloc_nhop_structure(void);
83 static int get_nhop(struct rib_head *rnh, struct rt_addrinfo *info,
84 struct nhop_priv **pnh_priv);
85 static int finalize_nhop(struct nh_control *ctl, struct rt_addrinfo *info,
86 struct nhop_priv *nh_priv);
87 static struct ifnet *get_aifp(const struct nhop_object *nh, int reference);
88 static void fill_sdl_from_ifp(struct sockaddr_dl_short *sdl, const struct ifnet *ifp);
90 static void destroy_nhop_epoch(epoch_context_t ctx);
91 static void destroy_nhop(struct nhop_priv *nh_priv);
93 static void print_nhop(const char *prefix, const struct nhop_object *nh);
95 _Static_assert(__offsetof(struct nhop_object, nh_ifp) == 32,
96 "nhop_object: wrong nh_ifp offset");
97 _Static_assert(sizeof(struct nhop_object) <= 128,
98 "nhop_object: size exceeds 128 bytes");
100 static uma_zone_t nhops_zone; /* Global zone for each and every nexthop */
102 #define NHOP_OBJECT_ALIGNED_SIZE roundup2(sizeof(struct nhop_object), \
104 #define NHOP_PRIV_ALIGNED_SIZE roundup2(sizeof(struct nhop_priv), \
110 nhops_zone = uma_zcreate("routing nhops",
111 NHOP_OBJECT_ALIGNED_SIZE + NHOP_PRIV_ALIGNED_SIZE,
112 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
116 * Fetches the interface of source address used by the route.
117 * In all cases except interface-address-route it would be the
118 * same as the transmit interfaces.
119 * However, for the interface address this function will return
120 * this interface ifp instead of loopback. This is needed to support
121 * link-local IPv6 loopback communications.
123 * If @reference is non-zero, found ifp is referenced.
127 static struct ifnet *
128 get_aifp(const struct nhop_object *nh, int reference)
130 struct ifnet *aifp = NULL;
133 * Adjust the "outgoing" interface. If we're going to loop
134 * the packet back to ourselves, the ifp would be the loopback
135 * interface. However, we'd rather know the interface associated
136 * to the destination address (which should probably be one of
137 * our own addresses).
139 if ((nh->nh_ifp->if_flags & IFF_LOOPBACK) &&
140 nh->gw_sa.sa_family == AF_LINK) {
142 aifp = ifnet_byindex_ref(nh->gwl_sa.sdl_index);
144 aifp = ifnet_byindex(nh->gwl_sa.sdl_index);
146 DPRINTF("unable to get aifp for %s index %d",
147 if_name(nh->nh_ifp), nh->gwl_sa.sdl_index);
161 cmp_priv(const struct nhop_priv *_one, const struct nhop_priv *_two)
164 if (memcmp(_one->nh, _two->nh, NHOP_END_CMP) != 0)
167 if ((_one->nh_type != _two->nh_type) ||
168 (_one->nh_family != _two->nh_family))
175 * Conditionally sets @nh mtu data based on the @info data.
178 set_nhop_mtu_from_info(struct nhop_object *nh, const struct rt_addrinfo *info)
181 if (info->rti_mflags & RTV_MTU) {
182 if (info->rti_rmx->rmx_mtu != 0) {
184 * MTU was explicitly provided by user.
188 nh->nh_priv->rt_flags |= RTF_FIXEDMTU;
191 * User explicitly sets MTU to 0.
192 * Assume rollback to default.
194 nh->nh_priv->rt_flags &= ~RTF_FIXEDMTU;
196 nh->nh_mtu = info->rti_rmx->rmx_mtu;
201 * Fills in shorted link-level sockadd version suitable to be stored inside the
202 * nexthop gateway buffer.
205 fill_sdl_from_ifp(struct sockaddr_dl_short *sdl, const struct ifnet *ifp)
208 sdl->sdl_family = AF_LINK;
209 sdl->sdl_len = sizeof(struct sockaddr_dl_short);
210 sdl->sdl_index = ifp->if_index;
211 sdl->sdl_type = ifp->if_type;
215 set_nhop_gw_from_info(struct nhop_object *nh, struct rt_addrinfo *info)
219 gw = info->rti_info[RTAX_GATEWAY];
220 if (info->rti_flags & RTF_GATEWAY) {
221 if (gw->sa_len > sizeof(struct sockaddr_in6)) {
222 DPRINTF("nhop SA size too big: AF %d len %u",
223 gw->sa_family, gw->sa_len);
226 memcpy(&nh->gw_sa, gw, gw->sa_len);
229 * Interface route. Currently the route.c code adds
230 * sa of type AF_LINK, which is 56 bytes long. The only
231 * meaningful data there is the interface index. It is used
232 * used is the IPv6 loopback output, where we need to preserve
233 * the original interface to maintain proper scoping.
234 * Despite the fact that nexthop code stores original interface
235 * in the separate field (nh_aifp, see below), write AF_LINK
236 * compatible sa with shorter total length.
238 fill_sdl_from_ifp(&nh->gwl_sa, nh->nh_ifp);
245 convert_rt_to_nh_flags(int rt_flags)
249 res = (rt_flags & RTF_REJECT) ? NHF_REJECT : 0;
250 res |= (rt_flags & RTF_HOST) ? NHF_HOST : 0;
251 res |= (rt_flags & RTF_BLACKHOLE) ? NHF_BLACKHOLE : 0;
252 res |= (rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) ? NHF_REDIRECT : 0;
253 res |= (rt_flags & RTF_BROADCAST) ? NHF_BROADCAST : 0;
254 res |= (rt_flags & RTF_GATEWAY) ? NHF_GATEWAY : 0;
260 fill_nhop_from_info(struct nhop_priv *nh_priv, struct rt_addrinfo *info)
263 struct nhop_object *nh;
267 rt_flags = info->rti_flags & NHOP_RT_FLAG_MASK;
269 nh->nh_priv->rt_flags = rt_flags;
270 nh_priv->nh_family = info->rti_info[RTAX_DST]->sa_family;
271 nh_priv->nh_type = 0; // hook responsibility to set nhop type
273 nh->nh_flags = convert_rt_to_nh_flags(rt_flags);
274 set_nhop_mtu_from_info(nh, info);
275 nh->nh_ifp = info->rti_ifa->ifa_ifp;
276 nh->nh_ifa = info->rti_ifa;
277 nh->nh_aifp = get_aifp(nh, 0);
279 if ((error = set_nhop_gw_from_info(nh, info)) != 0)
283 * Note some of the remaining data is set by the
284 * per-address-family pre-add hook.
291 * Creates a new nexthop based on the information in @info.
294 * 0 on success, filling @nh_ret with the desired nexthop object ptr
298 nhop_create_from_info(struct rib_head *rnh, struct rt_addrinfo *info,
299 struct nhop_object **nh_ret)
301 struct nhop_priv *nh_priv;
306 nh_priv = alloc_nhop_structure();
308 error = fill_nhop_from_info(nh_priv, info);
310 uma_zfree(nhops_zone, nh_priv->nh);
314 error = get_nhop(rnh, info, &nh_priv);
316 *nh_ret = nh_priv->nh;
322 * Gets linked nhop using the provided @pnh_priv nexhop data.
323 * If linked nhop is found, returns it, freeing the provided one.
324 * If there is no such nexthop, attaches the remaining data to the
325 * provided nexthop and links it.
327 * Returns 0 on success, storing referenced nexthop in @pnh_priv.
328 * Otherwise, errno is returned.
331 get_nhop(struct rib_head *rnh, struct rt_addrinfo *info,
332 struct nhop_priv **pnh_priv)
334 const struct sockaddr *dst, *gateway, *netmask;
335 struct nhop_priv *nh_priv, *tmp_priv;
340 /* Give the protocols chance to augment the request data */
341 dst = info->rti_info[RTAX_DST];
342 netmask = info->rti_info[RTAX_NETMASK];
343 gateway = info->rti_info[RTAX_GATEWAY];
345 error = rnh->rnh_preadd(rnh->rib_fibnum, dst, netmask, nh_priv->nh);
347 uma_zfree(nhops_zone, nh_priv->nh);
351 tmp_priv = find_nhop(rnh->nh_control, nh_priv);
352 if (tmp_priv != NULL) {
353 uma_zfree(nhops_zone, nh_priv->nh);
354 *pnh_priv = tmp_priv;
359 * Existing nexthop not found, need to create new one.
360 * Note: multiple simultaneous get_nhop() requests
361 * can result in multiple equal nexhops existing in the
362 * nexthop table. This is not a not a problem until the
363 * relative number of such nexthops is significant, which
364 * is extremely unlikely.
367 error = finalize_nhop(rnh->nh_control, info, nh_priv);
375 * Update @nh with data supplied in @info.
376 * This is a helper function to support route changes.
378 * It limits the changes that can be done to the route to the following:
379 * 1) all combination of gateway changes (gw, interface, blackhole/reject)
380 * 2) route flags (FLAG[123],STATIC,BLACKHOLE,REJECT)
387 alter_nhop_from_info(struct nhop_object *nh, struct rt_addrinfo *info)
389 struct sockaddr *info_gw;
392 /* Update MTU if set in the request*/
393 set_nhop_mtu_from_info(nh, info);
395 /* XXX: allow only one of BLACKHOLE,REJECT,GATEWAY */
397 /* Allow some flags (FLAG1,STATIC,BLACKHOLE,REJECT) to be toggled on change. */
398 nh->nh_priv->rt_flags &= ~RTF_FMASK;
399 nh->nh_priv->rt_flags |= info->rti_flags & RTF_FMASK;
401 /* Consider gateway change */
402 info_gw = info->rti_info[RTAX_GATEWAY];
403 if (info_gw != NULL) {
404 error = set_nhop_gw_from_info(nh, info);
407 /* Update RTF_GATEWAY flag status */
408 nh->nh_priv->rt_flags &= ~RTF_GATEWAY;
409 nh->nh_priv->rt_flags |= (RTF_GATEWAY & info->rti_flags);
411 /* Update datapath flags */
412 nh->nh_flags = convert_rt_to_nh_flags(nh->nh_priv->rt_flags);
414 if (info->rti_ifa != NULL)
415 nh->nh_ifa = info->rti_ifa;
416 if (info->rti_ifp != NULL)
417 nh->nh_ifp = info->rti_ifp;
418 nh->nh_aifp = get_aifp(nh, 0);
424 * Creates new nexthop based on @nh_orig and augmentation data from @info.
425 * Helper function used in the route changes, please see
426 * alter_nhop_from_info() comments for more details.
429 * 0 on success, filling @nh_ret with the desired nexthop object
433 nhop_create_from_nhop(struct rib_head *rnh, const struct nhop_object *nh_orig,
434 struct rt_addrinfo *info, struct nhop_object **pnh)
436 struct nhop_priv *nh_priv;
437 struct nhop_object *nh;
442 nh_priv = alloc_nhop_structure();
445 /* Start with copying data from original nexthop */
446 nh_priv->nh_family = nh_orig->nh_priv->nh_family;
447 nh_priv->rt_flags = nh_orig->nh_priv->rt_flags;
448 nh_priv->nh_type = nh_orig->nh_priv->nh_type;
450 nh->nh_ifp = nh_orig->nh_ifp;
451 nh->nh_ifa = nh_orig->nh_ifa;
452 nh->nh_aifp = nh_orig->nh_aifp;
453 nh->nh_mtu = nh_orig->nh_mtu;
454 nh->nh_flags = nh_orig->nh_flags;
455 memcpy(&nh->gw_sa, &nh_orig->gw_sa, nh_orig->gw_sa.sa_len);
457 error = alter_nhop_from_info(nh, info);
459 uma_zfree(nhops_zone, nh_priv->nh);
463 error = get_nhop(rnh, info, &nh_priv);
471 * Allocates memory for public/private nexthop structures.
473 * Returns pointer to nhop_priv or NULL.
475 static struct nhop_priv *
476 alloc_nhop_structure()
478 struct nhop_object *nh;
479 struct nhop_priv *nh_priv;
481 nh = (struct nhop_object *)uma_zalloc(nhops_zone, M_NOWAIT | M_ZERO);
484 nh_priv = (struct nhop_priv *)((char *)nh + NHOP_OBJECT_ALIGNED_SIZE);
486 nh->nh_priv = nh_priv;
493 * Alocates/references the remaining bits of nexthop data and links
494 * it to the hash table.
495 * Returns 0 if successful,
496 * errno otherwise. @nh_priv is freed in case of error.
499 finalize_nhop(struct nh_control *ctl, struct rt_addrinfo *info,
500 struct nhop_priv *nh_priv)
502 struct nhop_object *nh;
506 /* Allocate per-cpu packet counter */
507 nh->nh_pksent = counter_u64_alloc(M_NOWAIT);
508 if (nh->nh_pksent == NULL) {
509 uma_zfree(nhops_zone, nh);
510 RTSTAT_INC(rts_nh_alloc_failure);
511 DPRINTF("nh_alloc_finalize failed");
515 /* Save vnet to ease destruction */
516 nh_priv->nh_vnet = curvnet;
518 /* Reference external objects and calculate (referenced) ifa */
521 nh->nh_aifp = get_aifp(nh, 1);
522 DPRINTF("AIFP: %p nh_ifp %p", nh->nh_aifp, nh->nh_ifp);
524 refcount_init(&nh_priv->nh_refcnt, 1);
526 /* Please see nhop_free() comments on the initial value */
527 refcount_init(&nh_priv->nh_linked, 2);
529 print_nhop("FINALIZE", nh);
531 if (link_nhop(ctl, nh_priv) == 0) {
533 * Adding nexthop to the datastructures
534 * failed. Call destructor w/o waiting for
535 * the epoch end, as nexthop is not used
538 DPRINTF("link_nhop failed!");
539 destroy_nhop(nh_priv);
548 print_nhop_sa(char *buf, size_t buflen, const struct sockaddr *sa)
551 if (sa->sa_family == AF_INET) {
552 const struct sockaddr_in *sin4;
553 sin4 = (const struct sockaddr_in *)sa;
554 inet_ntop(AF_INET, &sin4->sin_addr, buf, buflen);
555 } else if (sa->sa_family == AF_INET6) {
556 const struct sockaddr_in6 *sin6;
557 sin6 = (const struct sockaddr_in6 *)sa;
558 inet_ntop(AF_INET6, &sin6->sin6_addr, buf, buflen);
559 } else if (sa->sa_family == AF_LINK) {
560 const struct sockaddr_dl *sdl;
561 sdl = (const struct sockaddr_dl *)sa;
562 snprintf(buf, buflen, "if#%d", sdl->sdl_index);
564 snprintf(buf, buflen, "af:%d", sa->sa_family);
568 print_nhop(const char *prefix, const struct nhop_object *nh)
570 char src_buf[INET6_ADDRSTRLEN], addr_buf[INET6_ADDRSTRLEN];
572 print_nhop_sa(src_buf, sizeof(src_buf), nh->nh_ifa->ifa_addr);
573 print_nhop_sa(addr_buf, sizeof(addr_buf), &nh->gw_sa);
575 DPRINTF("%s nhop priv %p: AF %d ifp %p %s addr %s src %p %s aifp %p %s mtu %d nh_flags %X",
576 prefix, nh->nh_priv, nh->nh_priv->nh_family, nh->nh_ifp,
577 if_name(nh->nh_ifp), addr_buf, nh->nh_ifa, src_buf, nh->nh_aifp,
578 if_name(nh->nh_aifp), nh->nh_mtu, nh->nh_flags);
582 destroy_nhop(struct nhop_priv *nh_priv)
584 struct nhop_object *nh;
588 print_nhop("DEL", nh);
591 if_rele(nh->nh_aifp);
592 ifa_free(nh->nh_ifa);
593 counter_u64_free(nh->nh_pksent);
595 uma_zfree(nhops_zone, nh);
599 * Epoch callback indicating nhop is safe to destroy
602 destroy_nhop_epoch(epoch_context_t ctx)
604 struct nhop_priv *nh_priv;
606 nh_priv = __containerof(ctx, struct nhop_priv, nh_epoch_ctx);
608 destroy_nhop(nh_priv);
612 nhop_ref_object(struct nhop_object *nh)
616 old = refcount_acquire(&nh->nh_priv->nh_refcnt);
617 KASSERT(old > 0, ("%s: nhop object %p has 0 refs", __func__, nh));
621 nhop_try_ref_object(struct nhop_object *nh)
624 return (refcount_acquire_if_not_zero(&nh->nh_priv->nh_refcnt));
628 nhop_free(struct nhop_object *nh)
630 struct nh_control *ctl;
631 struct nhop_priv *nh_priv = nh->nh_priv;
632 struct epoch_tracker et;
634 if (!refcount_release(&nh_priv->nh_refcnt))
638 * There are only 2 places, where nh_linked can be decreased:
639 * rib destroy (nhops_destroy_rib) and this function.
640 * nh_link can never be increased.
642 * Hence, use initial value of 2 to make use of
643 * refcount_release_if_not_last().
645 * There can be two scenarious when calling this function:
647 * 1) nh_linked value is 2. This means that either
648 * nhops_destroy_rib() has not been called OR it is running,
649 * but we are guaranteed that nh_control won't be freed in
650 * this epoch. Hence, nexthop can be safely unlinked.
652 * 2) nh_linked value is 1. In that case, nhops_destroy_rib()
653 * has been called and nhop unlink can be skipped.
657 if (refcount_release_if_not_last(&nh_priv->nh_linked)) {
658 ctl = nh_priv->nh_control;
659 if (unlink_nhop(ctl, nh_priv) == NULL) {
660 /* Do not try to reclaim */
661 DPRINTF("Failed to unlink nexhop %p", nh_priv);
668 epoch_call(net_epoch_preempt, destroy_nhop_epoch,
669 &nh_priv->nh_epoch_ctx);
673 nhop_ref_any(struct nhop_object *nh)
676 return (nhop_try_ref_object(nh));
680 nhop_free_any(struct nhop_object *nh)
686 /* Helper functions */
689 nhop_get_idx(const struct nhop_object *nh)
692 return (nh->nh_priv->nh_idx);
696 nhop_get_type(const struct nhop_object *nh)
699 return (nh->nh_priv->nh_type);
703 nhop_set_type(struct nhop_object *nh, enum nhop_type nh_type)
706 nh->nh_priv->nh_type = nh_type;
710 nhop_get_rtflags(const struct nhop_object *nh)
713 return (nh->nh_priv->rt_flags);
717 nhop_set_rtflags(struct nhop_object *nh, int rt_flags)
720 nh->nh_priv->rt_flags = rt_flags;
724 nhop_get_vnet(const struct nhop_object *nh)
727 return (nh->nh_priv->nh_vnet);
731 nhops_update_ifmtu(struct rib_head *rh, struct ifnet *ifp, uint32_t mtu)
733 struct nh_control *ctl;
734 struct nhop_priv *nh_priv;
735 struct nhop_object *nh;
737 ctl = rh->nh_control;
740 CHT_SLIST_FOREACH(&ctl->nh_head, nhops, nh_priv) {
742 if (nh->nh_ifp == ifp) {
743 if ((nh_priv->rt_flags & RTF_FIXEDMTU) == 0 ||
745 /* Update MTU directly */
749 } CHT_SLIST_FOREACH_END;
755 * Dumps a single entry to sysctl buffer.
758 * rt_msghdr - generic RTM header to allow users to skip non-understood messages
759 * nhop_external - nexhop description structure (with length)
760 * nhop_addrs - structure encapsulating GW/SRC sockaddrs
763 dump_nhop_entry(struct rib_head *rh, struct nhop_object *nh, struct sysctl_req *w)
766 struct rt_msghdr rtm;
767 struct nhop_external nhe;
768 struct nhop_addrs na;
770 struct nhop_external *pnhe;
771 struct sockaddr *gw_sa, *src_sa;
772 struct sockaddr_storage ss;
776 //DPRINTF("Dumping: head %p nh %p flags %X req %p\n", rh, nh, nh->nh_flags, w);
778 memset(&arpc, 0, sizeof(arpc));
780 arpc.rtm.rtm_msglen = sizeof(arpc);
781 arpc.rtm.rtm_version = RTM_VERSION;
782 arpc.rtm.rtm_type = RTM_GET;
783 //arpc.rtm.rtm_flags = RTF_UP;
784 arpc.rtm.rtm_flags = nh->nh_priv->rt_flags;
788 pnhe->nh_len = sizeof(struct nhop_external);
789 pnhe->nh_idx = nh->nh_priv->nh_idx;
790 pnhe->nh_fib = rh->rib_fibnum;
791 pnhe->ifindex = nh->nh_ifp->if_index;
792 pnhe->aifindex = nh->nh_aifp->if_index;
793 pnhe->nh_family = nh->nh_priv->nh_family;
794 pnhe->nh_type = nh->nh_priv->nh_type;
795 pnhe->nh_mtu = nh->nh_mtu;
796 pnhe->nh_flags = nh->nh_flags;
798 memcpy(pnhe->nh_prepend, nh->nh_prepend, sizeof(nh->nh_prepend));
799 pnhe->prepend_len = nh->nh_prepend_len;
800 pnhe->nh_refcount = nh->nh_priv->nh_refcnt;
801 pnhe->nh_pksent = counter_u64_fetch(nh->nh_pksent);
803 /* sockaddr container */
804 addrs_len = sizeof(struct nhop_addrs);
805 arpc.na.gw_sa_off = addrs_len;
806 gw_sa = (struct sockaddr *)&nh->gw4_sa;
807 addrs_len += gw_sa->sa_len;
809 src_sa = nh->nh_ifa->ifa_addr;
810 if (src_sa->sa_family == AF_LINK) {
811 /* Shorten structure */
812 memset(&ss, 0, sizeof(struct sockaddr_storage));
813 fill_sdl_from_ifp((struct sockaddr_dl_short *)&ss,
814 nh->nh_ifa->ifa_ifp);
815 src_sa = (struct sockaddr *)&ss;
817 arpc.na.src_sa_off = addrs_len;
818 addrs_len += src_sa->sa_len;
820 /* Write total container length */
821 arpc.na.na_len = addrs_len;
823 arpc.rtm.rtm_msglen += arpc.na.na_len - sizeof(struct nhop_addrs);
825 error = SYSCTL_OUT(w, &arpc, sizeof(arpc));
827 error = SYSCTL_OUT(w, gw_sa, gw_sa->sa_len);
829 error = SYSCTL_OUT(w, src_sa, src_sa->sa_len);
835 nhops_dump_sysctl(struct rib_head *rh, struct sysctl_req *w)
837 struct nh_control *ctl;
838 struct nhop_priv *nh_priv;
841 ctl = rh->nh_control;
844 DPRINTF("NHDUMP: count=%u", ctl->nh_head.items_count);
845 CHT_SLIST_FOREACH(&ctl->nh_head, nhops, nh_priv) {
846 error = dump_nhop_entry(rh, nh_priv->nh, w);
851 } CHT_SLIST_FOREACH_END;