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>
52 #include <net/route/shared.h>
56 * This file contains core functionality for the nexthop ("nhop") route subsystem.
57 * The business logic needed to create nexhop objects is implemented here.
59 * Nexthops in the original sense are the objects containing all the necessary
60 * information to forward the packet to the selected destination.
61 * In particular, nexthop is defined by a combination of
62 * ifp, ifa, aifp, mtu, gw addr(if set), nh_type, nh_family, mask of rt_flags and
65 * Additionally, each nexthop gets assigned its unique index (nexthop index).
66 * It serves two purposes: first one is to ease the ability of userland programs to
67 * reference nexthops by their index. The second one allows lookup algorithms to
68 * to store index instead of pointer (2 bytes vs 8) as a lookup result.
69 * All nexthops are stored in the resizable hash table.
71 * Basically, this file revolves around supporting 3 functions:
72 * 1) nhop_create_from_info / nhop_create_from_nhop, which contains all
73 * business logic on filling the nexthop fields based on the provided request.
74 * 2) nhop_get(), which gets a usable referenced nexthops.
77 * 1) non-exported functions start with verb
78 * 2) exported function starts with the subsystem prefix: "nhop"
81 static int dump_nhop_entry(struct rib_head *rh, struct nhop_object *nh, struct sysctl_req *w);
83 static struct nhop_priv *alloc_nhop_structure(void);
84 static int get_nhop(struct rib_head *rnh, struct rt_addrinfo *info,
85 struct nhop_priv **pnh_priv);
86 static int finalize_nhop(struct nh_control *ctl, struct rt_addrinfo *info,
87 struct nhop_priv *nh_priv);
88 static struct ifnet *get_aifp(const struct nhop_object *nh, int reference);
89 static void fill_sdl_from_ifp(struct sockaddr_dl_short *sdl, const struct ifnet *ifp);
91 static void destroy_nhop_epoch(epoch_context_t ctx);
92 static void destroy_nhop(struct nhop_priv *nh_priv);
94 static void print_nhop(const char *prefix, const struct nhop_object *nh);
96 _Static_assert(__offsetof(struct nhop_object, nh_ifp) == 32,
97 "nhop_object: wrong nh_ifp offset");
98 _Static_assert(sizeof(struct nhop_object) <= 128,
99 "nhop_object: size exceeds 128 bytes");
101 static uma_zone_t nhops_zone; /* Global zone for each and every nexthop */
104 #define NHOP_OBJECT_ALIGNED_SIZE roundup2(sizeof(struct nhop_object), \
106 #define NHOP_PRIV_ALIGNED_SIZE roundup2(sizeof(struct nhop_priv), \
112 nhops_zone = uma_zcreate("routing nhops",
113 NHOP_OBJECT_ALIGNED_SIZE + NHOP_PRIV_ALIGNED_SIZE,
114 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
118 * Fetches the interface of source address used by the route.
119 * In all cases except interface-address-route it would be the
120 * same as the transmit interfaces.
121 * However, for the interface address this function will return
122 * this interface ifp instead of loopback. This is needed to support
123 * link-local IPv6 loopback communications.
125 * If @reference is non-zero, found ifp is referenced.
129 static struct ifnet *
130 get_aifp(const struct nhop_object *nh, int reference)
132 struct ifnet *aifp = NULL;
135 * Adjust the "outgoing" interface. If we're going to loop
136 * the packet back to ourselves, the ifp would be the loopback
137 * interface. However, we'd rather know the interface associated
138 * to the destination address (which should probably be one of
139 * our own addresses).
141 if ((nh->nh_ifp->if_flags & IFF_LOOPBACK) &&
142 nh->gw_sa.sa_family == AF_LINK) {
144 aifp = ifnet_byindex_ref(nh->gwl_sa.sdl_index);
146 aifp = ifnet_byindex(nh->gwl_sa.sdl_index);
148 DPRINTF("unable to get aifp for %s index %d",
149 if_name(nh->nh_ifp), nh->gwl_sa.sdl_index);
163 cmp_priv(const struct nhop_priv *_one, const struct nhop_priv *_two)
166 if (memcmp(_one->nh, _two->nh, NHOP_END_CMP) != 0)
169 if ((_one->nh_type != _two->nh_type) ||
170 (_one->nh_family != _two->nh_family))
177 * Conditionally sets @nh mtu data based on the @info data.
180 set_nhop_mtu_from_info(struct nhop_object *nh, const struct rt_addrinfo *info)
183 if (info->rti_mflags & RTV_MTU) {
184 if (info->rti_rmx->rmx_mtu != 0) {
187 * MTU was explicitly provided by user.
191 nh->nh_priv->rt_flags |= RTF_FIXEDMTU;
195 * User explicitly sets MTU to 0.
196 * Assume rollback to default.
198 nh->nh_priv->rt_flags &= ~RTF_FIXEDMTU;
200 nh->nh_mtu = info->rti_rmx->rmx_mtu;
205 * Fills in shorted link-level sockadd version suitable to be stored inside the
206 * nexthop gateway buffer.
209 fill_sdl_from_ifp(struct sockaddr_dl_short *sdl, const struct ifnet *ifp)
212 sdl->sdl_family = AF_LINK;
213 sdl->sdl_len = sizeof(struct sockaddr_dl_short);
214 sdl->sdl_index = ifp->if_index;
215 sdl->sdl_type = ifp->if_type;
219 set_nhop_gw_from_info(struct nhop_object *nh, struct rt_addrinfo *info)
223 gw = info->rti_info[RTAX_GATEWAY];
224 if (info->rti_flags & RTF_GATEWAY) {
225 if (gw->sa_len > sizeof(struct sockaddr_in6)) {
226 DPRINTF("nhop SA size too big: AF %d len %u",
227 gw->sa_family, gw->sa_len);
230 memcpy(&nh->gw_sa, gw, gw->sa_len);
233 * Interface route. Currently the route.c code adds
234 * sa of type AF_LINK, which is 56 bytes long. The only
235 * meaningful data there is the interface index. It is used
236 * used is the IPv6 loopback output, where we need to preserve
237 * the original interface to maintain proper scoping.
238 * Despite the fact that nexthop code stores original interface
239 * in the separate field (nh_aifp, see below), write AF_LINK
240 * compatible sa with shorter total length.
242 fill_sdl_from_ifp(&nh->gwl_sa, nh->nh_ifp);
249 fill_nhop_from_info(struct nhop_priv *nh_priv, struct rt_addrinfo *info)
252 struct nhop_object *nh;
256 rt_flags = info->rti_flags & NHOP_RT_FLAG_MASK;
258 nh->nh_priv->rt_flags = rt_flags;
259 nh_priv->nh_family = info->rti_info[RTAX_DST]->sa_family;
260 nh_priv->nh_type = 0; // hook responsibility to set nhop type
262 nh->nh_flags = fib_rte_to_nh_flags(rt_flags);
263 set_nhop_mtu_from_info(nh, info);
264 nh->nh_ifp = info->rti_ifa->ifa_ifp;
265 nh->nh_ifa = info->rti_ifa;
266 nh->nh_aifp = get_aifp(nh, 0);
268 if ((error = set_nhop_gw_from_info(nh, info)) != 0)
272 * Note some of the remaining data is set by the
273 * per-address-family pre-add hook.
280 * Creates a new nexthop based on the information in @info.
283 * 0 on success, filling @nh_ret with the desired nexthop object ptr
287 nhop_create_from_info(struct rib_head *rnh, struct rt_addrinfo *info,
288 struct nhop_object **nh_ret)
290 struct nhop_priv *nh_priv;
295 nh_priv = alloc_nhop_structure();
297 error = fill_nhop_from_info(nh_priv, info);
299 uma_zfree(nhops_zone, nh_priv->nh);
303 error = get_nhop(rnh, info, &nh_priv);
305 *nh_ret = nh_priv->nh;
311 * Gets linked nhop using the provided @pnh_priv nexhop data.
312 * If linked nhop is found, returns it, freeing the provided one.
313 * If there is no such nexthop, attaches the remaining data to the
314 * provided nexthop and links it.
316 * Returns 0 on success, storing referenced nexthop in @pnh_priv.
317 * Otherwise, errno is returned.
320 get_nhop(struct rib_head *rnh, struct rt_addrinfo *info,
321 struct nhop_priv **pnh_priv)
323 const struct sockaddr *dst, *gateway, *netmask;
324 struct nhop_priv *nh_priv, *tmp_priv;
329 /* Give the protocols chance to augment the request data */
330 dst = info->rti_info[RTAX_DST];
331 netmask = info->rti_info[RTAX_NETMASK];
332 gateway = info->rti_info[RTAX_GATEWAY];
334 error = rnh->rnh_preadd(rnh->rib_fibnum, dst, netmask, nh_priv->nh);
336 uma_zfree(nhops_zone, nh_priv->nh);
340 tmp_priv = find_nhop(rnh->nh_control, nh_priv);
341 if (tmp_priv != NULL) {
342 uma_zfree(nhops_zone, nh_priv->nh);
343 *pnh_priv = tmp_priv;
348 * Existing nexthop not found, need to create new one.
349 * Note: multiple simultaneous get_nhop() requests
350 * can result in multiple equal nexhops existing in the
351 * nexthop table. This is not a not a problem until the
352 * relative number of such nexthops is significant, which
353 * is extremely unlikely.
356 error = finalize_nhop(rnh->nh_control, info, nh_priv);
364 * Update @nh with data supplied in @info.
365 * This is a helper function to support route changes.
367 * It limits the changes that can be done to the route to the following:
368 * 1) all combination of gateway changes (gw, interface, blackhole/reject)
369 * 2) route flags (FLAG[123],STATIC,BLACKHOLE,REJECT)
376 alter_nhop_from_info(struct nhop_object *nh, struct rt_addrinfo *info)
378 struct sockaddr *info_gw;
381 /* Update MTU if set in the request*/
382 set_nhop_mtu_from_info(nh, info);
384 /* XXX: allow only one of BLACKHOLE,REJECT,GATEWAY */
386 /* Allow some flags (FLAG1,STATIC,BLACKHOLE,REJECT) to be toggled on change. */
387 nh->nh_priv->rt_flags &= ~RTF_FMASK;
388 nh->nh_priv->rt_flags |= info->rti_flags & RTF_FMASK;
390 /* Consider gateway change */
391 info_gw = info->rti_info[RTAX_GATEWAY];
392 if (info_gw != NULL) {
393 error = set_nhop_gw_from_info(nh, info);
396 /* Update RTF_GATEWAY flag status */
397 nh->nh_priv->rt_flags &= ~RTF_GATEWAY;
398 nh->nh_priv->rt_flags |= (RTF_GATEWAY & info->rti_flags);
400 /* Update datapath flags */
401 nh->nh_flags = fib_rte_to_nh_flags(nh->nh_priv->rt_flags);
403 if (info->rti_ifa != NULL)
404 nh->nh_ifa = info->rti_ifa;
405 if (info->rti_ifp != NULL)
406 nh->nh_ifp = info->rti_ifp;
407 nh->nh_aifp = get_aifp(nh, 0);
413 * Creates new nexthop based on @nh_orig and augmentation data from @info.
414 * Helper function used in the route changes, please see
415 * alter_nhop_from_info() comments for more details.
418 * 0 on success, filling @nh_ret with the desired nexthop object
422 nhop_create_from_nhop(struct rib_head *rnh, const struct nhop_object *nh_orig,
423 struct rt_addrinfo *info, struct nhop_object **pnh)
425 struct nhop_priv *nh_priv;
426 struct nhop_object *nh;
431 nh_priv = alloc_nhop_structure();
434 /* Start with copying data from original nexthop */
435 nh_priv->nh_family = nh_orig->nh_priv->nh_family;
436 nh_priv->rt_flags = nh_orig->nh_priv->rt_flags;
437 nh_priv->nh_type = nh_orig->nh_priv->nh_type;
439 nh->nh_ifp = nh_orig->nh_ifp;
440 nh->nh_ifa = nh_orig->nh_ifa;
441 nh->nh_aifp = nh_orig->nh_aifp;
442 nh->nh_mtu = nh_orig->nh_mtu;
443 nh->nh_flags = nh_orig->nh_flags;
444 memcpy(&nh->gw_sa, &nh_orig->gw_sa, nh_orig->gw_sa.sa_len);
446 error = alter_nhop_from_info(nh, info);
448 uma_zfree(nhops_zone, nh_priv->nh);
452 error = get_nhop(rnh, info, &nh_priv);
460 * Allocates memory for public/private nexthop structures.
462 * Returns pointer to nhop_priv or NULL.
464 static struct nhop_priv *
465 alloc_nhop_structure()
467 struct nhop_object *nh;
468 struct nhop_priv *nh_priv;
470 nh = (struct nhop_object *)uma_zalloc(nhops_zone, M_NOWAIT | M_ZERO);
473 nh_priv = (struct nhop_priv *)((char *)nh + NHOP_OBJECT_ALIGNED_SIZE);
475 nh->nh_priv = nh_priv;
482 * Alocates/references the remaining bits of nexthop data and links
483 * it to the hash table.
484 * Returns 0 if successful,
485 * errno otherwise. @nh_priv is freed in case of error.
488 finalize_nhop(struct nh_control *ctl, struct rt_addrinfo *info,
489 struct nhop_priv *nh_priv)
491 struct nhop_object *nh;
495 /* Allocate per-cpu packet counter */
496 nh->nh_pksent = counter_u64_alloc(M_NOWAIT);
497 if (nh->nh_pksent == NULL) {
498 uma_zfree(nhops_zone, nh);
499 RTSTAT_INC(rts_nh_alloc_failure);
500 DPRINTF("nh_alloc_finalize failed");
504 /* Save vnet to ease destruction */
505 nh_priv->nh_vnet = curvnet;
507 /* Reference external objects and calculate (referenced) ifa */
510 nh->nh_aifp = get_aifp(nh, 1);
511 DPRINTF("AIFP: %p nh_ifp %p", nh->nh_aifp, nh->nh_ifp);
513 refcount_init(&nh_priv->nh_refcnt, 1);
515 /* Please see nhop_free() comments on the initial value */
516 refcount_init(&nh_priv->nh_linked, 2);
518 print_nhop("FINALIZE", nh);
520 if (link_nhop(ctl, nh_priv) == 0) {
523 * Adding nexthop to the datastructures
524 * failed. Call destructor w/o waiting for
525 * the epoch end, as nexthop is not used
528 DPRINTF("link_nhop failed!");
529 destroy_nhop(nh_priv);
538 print_nhop_sa(char *buf, size_t buflen, const struct sockaddr *sa)
541 if (sa->sa_family == AF_INET) {
542 const struct sockaddr_in *sin4;
543 sin4 = (const struct sockaddr_in *)sa;
544 inet_ntop(AF_INET, &sin4->sin_addr, buf, buflen);
545 } else if (sa->sa_family == AF_INET6) {
546 const struct sockaddr_in6 *sin6;
547 sin6 = (const struct sockaddr_in6 *)sa;
548 inet_ntop(AF_INET6, &sin6->sin6_addr, buf, buflen);
549 } else if (sa->sa_family == AF_LINK) {
550 const struct sockaddr_dl *sdl;
551 sdl = (const struct sockaddr_dl *)sa;
552 snprintf(buf, buflen, "if#%d", sdl->sdl_index);
554 snprintf(buf, buflen, "af:%d", sa->sa_family);
558 print_nhop(const char *prefix, const struct nhop_object *nh)
560 char src_buf[INET6_ADDRSTRLEN], addr_buf[INET6_ADDRSTRLEN];
562 print_nhop_sa(src_buf, sizeof(src_buf), nh->nh_ifa->ifa_addr);
563 print_nhop_sa(addr_buf, sizeof(addr_buf), &nh->gw_sa);
565 DPRINTF("%s nhop priv %p: AF %d ifp %p %s addr %s src %p %s aifp %p %s mtu %d nh_flags %X",
566 prefix, nh->nh_priv, nh->nh_priv->nh_family, nh->nh_ifp,
567 if_name(nh->nh_ifp), addr_buf, nh->nh_ifa, src_buf, nh->nh_aifp,
568 if_name(nh->nh_aifp), nh->nh_mtu, nh->nh_flags);
572 destroy_nhop(struct nhop_priv *nh_priv)
574 struct nhop_object *nh;
578 print_nhop("DEL", nh);
581 if_rele(nh->nh_aifp);
582 ifa_free(nh->nh_ifa);
583 counter_u64_free(nh->nh_pksent);
585 uma_zfree(nhops_zone, nh);
589 * Epoch callback indicating nhop is safe to destroy
592 destroy_nhop_epoch(epoch_context_t ctx)
594 struct nhop_priv *nh_priv;
596 nh_priv = __containerof(ctx, struct nhop_priv, nh_epoch_ctx);
598 destroy_nhop(nh_priv);
602 nhop_ref_object(struct nhop_object *nh)
606 old = refcount_acquire(&nh->nh_priv->nh_refcnt);
607 KASSERT(old > 0, ("%s: nhop object %p has 0 refs", __func__, nh));
611 nhop_try_ref_object(struct nhop_object *nh)
614 return (refcount_acquire_if_not_zero(&nh->nh_priv->nh_refcnt));
618 nhop_free(struct nhop_object *nh)
620 struct nh_control *ctl;
621 struct nhop_priv *nh_priv = nh->nh_priv;
622 struct epoch_tracker et;
624 if (!refcount_release(&nh_priv->nh_refcnt))
628 * There are only 2 places, where nh_linked can be decreased:
629 * rib destroy (nhops_destroy_rib) and this function.
630 * nh_link can never be increased.
632 * Hence, use initial value of 2 to make use of
633 * refcount_release_if_not_last().
635 * There can be two scenarious when calling this function:
637 * 1) nh_linked value is 2. This means that either
638 * nhops_destroy_rib() has not been called OR it is running,
639 * but we are guaranteed that nh_control won't be freed in
640 * this epoch. Hence, nexthop can be safely unlinked.
642 * 2) nh_linked value is 1. In that case, nhops_destroy_rib()
643 * has been called and nhop unlink can be skipped.
647 if (refcount_release_if_not_last(&nh_priv->nh_linked)) {
648 ctl = nh_priv->nh_control;
649 if (unlink_nhop(ctl, nh_priv) == NULL) {
650 /* Do not try to reclaim */
651 DPRINTF("Failed to unlink nexhop %p", nh_priv);
658 epoch_call(net_epoch_preempt, destroy_nhop_epoch,
659 &nh_priv->nh_epoch_ctx);
663 nhop_ref_any(struct nhop_object *nh)
666 return (nhop_try_ref_object(nh));
670 nhop_free_any(struct nhop_object *nh)
677 /* Helper functions */
680 nhop_get_idx(const struct nhop_object *nh)
683 return (nh->nh_priv->nh_idx);
687 nhop_get_type(const struct nhop_object *nh)
690 return (nh->nh_priv->nh_type);
694 nhop_set_type(struct nhop_object *nh, enum nhop_type nh_type)
697 nh->nh_priv->nh_type = nh_type;
701 nhop_get_rtflags(const struct nhop_object *nh)
704 return (nh->nh_priv->rt_flags);
708 nhop_set_rtflags(struct nhop_object *nh, int rt_flags)
711 nh->nh_priv->rt_flags = rt_flags;
715 nhop_get_vnet(const struct nhop_object *nh)
718 return (nh->nh_priv->nh_vnet);
722 nhops_update_ifmtu(struct rib_head *rh, struct ifnet *ifp, uint32_t mtu)
724 struct nh_control *ctl;
725 struct nhop_priv *nh_priv;
726 struct nhop_object *nh;
728 ctl = rh->nh_control;
731 CHT_SLIST_FOREACH(&ctl->nh_head, nhops, nh_priv) {
733 if (nh->nh_ifp == ifp) {
734 if ((nh_priv->rt_flags & RTF_FIXEDMTU) == 0 ||
736 /* Update MTU directly */
740 } CHT_SLIST_FOREACH_END;
746 * Dumps a single entry to sysctl buffer.
749 * rt_msghdr - generic RTM header to allow users to skip non-understood messages
750 * nhop_external - nexhop description structure (with length)
751 * nhop_addrs - structure encapsulating GW/SRC sockaddrs
754 dump_nhop_entry(struct rib_head *rh, struct nhop_object *nh, struct sysctl_req *w)
757 struct rt_msghdr rtm;
758 struct nhop_external nhe;
759 struct nhop_addrs na;
761 struct nhop_external *pnhe;
762 struct sockaddr *gw_sa, *src_sa;
763 struct sockaddr_storage ss;
767 //DPRINTF("Dumping: head %p nh %p flags %X req %p\n", rh, nh, nh->nh_flags, w);
769 memset(&arpc, 0, sizeof(arpc));
771 arpc.rtm.rtm_msglen = sizeof(arpc);
772 arpc.rtm.rtm_version = RTM_VERSION;
773 arpc.rtm.rtm_type = RTM_GET;
774 //arpc.rtm.rtm_flags = RTF_UP;
775 arpc.rtm.rtm_flags = nh->nh_priv->rt_flags;
779 pnhe->nh_len = sizeof(struct nhop_external);
780 pnhe->nh_idx = nh->nh_priv->nh_idx;
781 pnhe->nh_fib = rh->rib_fibnum;
782 pnhe->ifindex = nh->nh_ifp->if_index;
783 pnhe->aifindex = nh->nh_aifp->if_index;
784 pnhe->nh_family = nh->nh_priv->nh_family;
785 pnhe->nh_type = nh->nh_priv->nh_type;
786 pnhe->nh_mtu = nh->nh_mtu;
787 pnhe->nh_flags = nh->nh_flags;
789 memcpy(pnhe->nh_prepend, nh->nh_prepend, sizeof(nh->nh_prepend));
790 pnhe->prepend_len = nh->nh_prepend_len;
791 pnhe->nh_refcount = nh->nh_priv->nh_refcnt;
792 pnhe->nh_pksent = counter_u64_fetch(nh->nh_pksent);
794 /* sockaddr container */
795 addrs_len = sizeof(struct nhop_addrs);
796 arpc.na.gw_sa_off = addrs_len;
797 gw_sa = (struct sockaddr *)&nh->gw4_sa;
798 addrs_len += gw_sa->sa_len;
800 src_sa = nh->nh_ifa->ifa_addr;
801 if (src_sa->sa_family == AF_LINK) {
802 /* Shorten structure */
803 memset(&ss, 0, sizeof(struct sockaddr_storage));
804 fill_sdl_from_ifp((struct sockaddr_dl_short *)&ss,
805 nh->nh_ifa->ifa_ifp);
806 src_sa = (struct sockaddr *)&ss;
808 arpc.na.src_sa_off = addrs_len;
809 addrs_len += src_sa->sa_len;
811 /* Write total container length */
812 arpc.na.na_len = addrs_len;
814 arpc.rtm.rtm_msglen += arpc.na.na_len - sizeof(struct nhop_addrs);
816 error = SYSCTL_OUT(w, &arpc, sizeof(arpc));
818 error = SYSCTL_OUT(w, gw_sa, gw_sa->sa_len);
820 error = SYSCTL_OUT(w, src_sa, src_sa->sa_len);
826 nhops_dump_sysctl(struct rib_head *rh, struct sysctl_req *w)
828 struct nh_control *ctl;
829 struct nhop_priv *nh_priv;
832 ctl = rh->nh_control;
835 DPRINTF("NHDUMP: count=%u", ctl->nh_head.items_count);
836 CHT_SLIST_FOREACH(&ctl->nh_head, nhops, nh_priv) {
837 error = dump_nhop_entry(rh, nh_priv->nh, w);
842 } CHT_SLIST_FOREACH_END;