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_var.h>
48 #include <net/route/nhop_utils.h>
49 #include <net/route/nhop.h>
50 #include <net/route/nhop_var.h>
51 #include <net/route/shared.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 */
103 #define NHOP_OBJECT_ALIGNED_SIZE roundup2(sizeof(struct nhop_object), \
105 #define NHOP_PRIV_ALIGNED_SIZE roundup2(sizeof(struct nhop_priv), \
111 nhops_zone = uma_zcreate("routing nhops",
112 NHOP_OBJECT_ALIGNED_SIZE + NHOP_PRIV_ALIGNED_SIZE,
113 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
117 * Fetches the interface of source address used by the route.
118 * In all cases except interface-address-route it would be the
119 * same as the transmit interfaces.
120 * However, for the interface address this function will return
121 * this interface ifp instead of loopback. This is needed to support
122 * link-local IPv6 loopback communications.
124 * If @reference is non-zero, found ifp is referenced.
128 static struct ifnet *
129 get_aifp(const struct nhop_object *nh, int reference)
131 struct ifnet *aifp = NULL;
134 * Adjust the "outgoing" interface. If we're going to loop
135 * the packet back to ourselves, the ifp would be the loopback
136 * interface. However, we'd rather know the interface associated
137 * to the destination address (which should probably be one of
138 * our own addresses).
140 if ((nh->nh_ifp->if_flags & IFF_LOOPBACK) &&
141 nh->gw_sa.sa_family == AF_LINK) {
143 aifp = ifnet_byindex_ref(nh->gwl_sa.sdl_index);
145 aifp = ifnet_byindex(nh->gwl_sa.sdl_index);
147 DPRINTF("unable to get aifp for %s index %d",
148 if_name(nh->nh_ifp), nh->gwl_sa.sdl_index);
162 cmp_priv(const struct nhop_priv *_one, const struct nhop_priv *_two)
165 if (memcmp(_one->nh, _two->nh, NHOP_END_CMP) != 0)
168 if ((_one->nh_type != _two->nh_type) ||
169 (_one->nh_family != _two->nh_family))
176 * Conditionally sets @nh mtu data based on the @info data.
179 set_nhop_mtu_from_info(struct nhop_object *nh, const struct rt_addrinfo *info)
182 if (info->rti_mflags & RTV_MTU) {
183 if (info->rti_rmx->rmx_mtu != 0) {
186 * MTU was explicitly provided by user.
190 nh->nh_priv->rt_flags |= RTF_FIXEDMTU;
194 * User explicitly sets MTU to 0.
195 * Assume rollback to default.
197 nh->nh_priv->rt_flags &= ~RTF_FIXEDMTU;
199 nh->nh_mtu = info->rti_rmx->rmx_mtu;
204 * Fills in shorted link-level sockadd version suitable to be stored inside the
205 * nexthop gateway buffer.
208 fill_sdl_from_ifp(struct sockaddr_dl_short *sdl, const struct ifnet *ifp)
211 sdl->sdl_family = AF_LINK;
212 sdl->sdl_len = sizeof(struct sockaddr_dl_short);
213 sdl->sdl_index = ifp->if_index;
214 sdl->sdl_type = ifp->if_type;
218 set_nhop_gw_from_info(struct nhop_object *nh, struct rt_addrinfo *info)
222 gw = info->rti_info[RTAX_GATEWAY];
223 if (info->rti_flags & RTF_GATEWAY) {
224 if (gw->sa_len > sizeof(struct sockaddr_in6)) {
225 DPRINTF("nhop SA size too big: AF %d len %u",
226 gw->sa_family, gw->sa_len);
229 memcpy(&nh->gw_sa, gw, gw->sa_len);
232 * Interface route. Currently the route.c code adds
233 * sa of type AF_LINK, which is 56 bytes long. The only
234 * meaningful data there is the interface index. It is used
235 * used is the IPv6 loopback output, where we need to preserve
236 * the original interface to maintain proper scoping.
237 * Despite the fact that nexthop code stores original interface
238 * in the separate field (nh_aifp, see below), write AF_LINK
239 * compatible sa with shorter total length.
241 fill_sdl_from_ifp(&nh->gwl_sa, nh->nh_ifp);
248 fill_nhop_from_info(struct nhop_priv *nh_priv, struct rt_addrinfo *info)
251 struct nhop_object *nh;
255 rt_flags = info->rti_flags & NHOP_RT_FLAG_MASK;
257 nh->nh_priv->rt_flags = rt_flags;
258 nh_priv->nh_family = info->rti_info[RTAX_DST]->sa_family;
259 nh_priv->nh_type = 0; // hook responsibility to set nhop type
261 nh->nh_flags = fib_rte_to_nh_flags(rt_flags);
262 set_nhop_mtu_from_info(nh, info);
263 nh->nh_ifp = info->rti_ifa->ifa_ifp;
264 nh->nh_ifa = info->rti_ifa;
265 nh->nh_aifp = get_aifp(nh, 0);
267 if ((error = set_nhop_gw_from_info(nh, info)) != 0)
271 * Note some of the remaining data is set by the
272 * per-address-family pre-add hook.
279 * Creates a new nexthop based on the information in @info.
282 * 0 on success, filling @nh_ret with the desired nexthop object ptr
286 nhop_create_from_info(struct rib_head *rnh, struct rt_addrinfo *info,
287 struct nhop_object **nh_ret)
289 struct nhop_priv *nh_priv;
294 nh_priv = alloc_nhop_structure();
296 error = fill_nhop_from_info(nh_priv, info);
298 uma_zfree(nhops_zone, nh_priv->nh);
302 error = get_nhop(rnh, info, &nh_priv);
304 *nh_ret = nh_priv->nh;
310 * Gets linked nhop using the provided @pnh_priv nexhop data.
311 * If linked nhop is found, returns it, freeing the provided one.
312 * If there is no such nexthop, attaches the remaining data to the
313 * provided nexthop and links it.
315 * Returns 0 on success, storing referenced nexthop in @pnh_priv.
316 * Otherwise, errno is returned.
319 get_nhop(struct rib_head *rnh, struct rt_addrinfo *info,
320 struct nhop_priv **pnh_priv)
322 const struct sockaddr *dst, *gateway, *netmask;
323 struct nhop_priv *nh_priv, *tmp_priv;
328 /* Give the protocols chance to augment the request data */
329 dst = info->rti_info[RTAX_DST];
330 netmask = info->rti_info[RTAX_NETMASK];
331 gateway = info->rti_info[RTAX_GATEWAY];
333 error = rnh->rnh_preadd(rnh->rib_fibnum, dst, netmask, nh_priv->nh);
335 uma_zfree(nhops_zone, nh_priv->nh);
339 tmp_priv = find_nhop(rnh->nh_control, nh_priv);
340 if (tmp_priv != NULL) {
341 uma_zfree(nhops_zone, nh_priv->nh);
342 *pnh_priv = tmp_priv;
347 * Existing nexthop not found, need to create new one.
348 * Note: multiple simultaneous get_nhop() requests
349 * can result in multiple equal nexhops existing in the
350 * nexthop table. This is not a not a problem until the
351 * relative number of such nexthops is significant, which
352 * is extremely unlikely.
355 error = finalize_nhop(rnh->nh_control, info, nh_priv);
363 * Update @nh with data supplied in @info.
364 * This is a helper function to support route changes.
366 * It limits the changes that can be done to the route to the following:
367 * 1) all combination of gateway changes (gw, interface, blackhole/reject)
368 * 2) route flags (FLAG[123],STATIC,BLACKHOLE,REJECT)
375 alter_nhop_from_info(struct nhop_object *nh, struct rt_addrinfo *info)
377 struct sockaddr *info_gw;
380 /* Update MTU if set in the request*/
381 set_nhop_mtu_from_info(nh, info);
383 /* XXX: allow only one of BLACKHOLE,REJECT,GATEWAY */
385 /* Allow some flags (FLAG1,STATIC,BLACKHOLE,REJECT) to be toggled on change. */
386 nh->nh_priv->rt_flags &= ~RTF_FMASK;
387 nh->nh_priv->rt_flags |= info->rti_flags & RTF_FMASK;
389 /* Consider gateway change */
390 info_gw = info->rti_info[RTAX_GATEWAY];
391 if (info_gw != NULL) {
392 error = set_nhop_gw_from_info(nh, info);
395 /* Update RTF_GATEWAY flag status */
396 nh->nh_priv->rt_flags &= ~RTF_GATEWAY;
397 nh->nh_priv->rt_flags |= (RTF_GATEWAY & info->rti_flags);
399 /* Update datapath flags */
400 nh->nh_flags = fib_rte_to_nh_flags(nh->nh_priv->rt_flags);
402 if (info->rti_ifa != NULL)
403 nh->nh_ifa = info->rti_ifa;
404 if (info->rti_ifp != NULL)
405 nh->nh_ifp = info->rti_ifp;
406 nh->nh_aifp = get_aifp(nh, 0);
412 * Creates new nexthop based on @nh_orig and augmentation data from @info.
413 * Helper function used in the route changes, please see
414 * alter_nhop_from_info() comments for more details.
417 * 0 on success, filling @nh_ret with the desired nexthop object
421 nhop_create_from_nhop(struct rib_head *rnh, const struct nhop_object *nh_orig,
422 struct rt_addrinfo *info, struct nhop_object **pnh)
424 struct nhop_priv *nh_priv;
425 struct nhop_object *nh;
430 nh_priv = alloc_nhop_structure();
433 /* Start with copying data from original nexthop */
434 nh_priv->nh_family = nh_orig->nh_priv->nh_family;
435 nh_priv->rt_flags = nh_orig->nh_priv->rt_flags;
436 nh_priv->nh_type = nh_orig->nh_priv->nh_type;
438 nh->nh_ifp = nh_orig->nh_ifp;
439 nh->nh_ifa = nh_orig->nh_ifa;
440 nh->nh_aifp = nh_orig->nh_aifp;
441 nh->nh_mtu = nh_orig->nh_mtu;
442 nh->nh_flags = nh_orig->nh_flags;
443 memcpy(&nh->gw_sa, &nh_orig->gw_sa, nh_orig->gw_sa.sa_len);
445 error = alter_nhop_from_info(nh, info);
447 uma_zfree(nhops_zone, nh_priv->nh);
451 error = get_nhop(rnh, info, &nh_priv);
459 * Allocates memory for public/private nexthop structures.
461 * Returns pointer to nhop_priv or NULL.
463 static struct nhop_priv *
464 alloc_nhop_structure()
466 struct nhop_object *nh;
467 struct nhop_priv *nh_priv;
469 nh = (struct nhop_object *)uma_zalloc(nhops_zone, M_NOWAIT | M_ZERO);
472 nh_priv = (struct nhop_priv *)((char *)nh + NHOP_OBJECT_ALIGNED_SIZE);
474 nh->nh_priv = nh_priv;
481 * Alocates/references the remaining bits of nexthop data and links
482 * it to the hash table.
483 * Returns 0 if successful,
484 * errno otherwise. @nh_priv is freed in case of error.
487 finalize_nhop(struct nh_control *ctl, struct rt_addrinfo *info,
488 struct nhop_priv *nh_priv)
490 struct nhop_object *nh;
494 /* Allocate per-cpu packet counter */
495 nh->nh_pksent = counter_u64_alloc(M_NOWAIT);
496 if (nh->nh_pksent == NULL) {
497 uma_zfree(nhops_zone, nh);
498 RTSTAT_INC(rts_nh_alloc_failure);
499 DPRINTF("nh_alloc_finalize failed");
503 /* Save vnet to ease destruction */
504 nh_priv->nh_vnet = curvnet;
506 /* Reference external objects and calculate (referenced) ifa */
509 nh->nh_aifp = get_aifp(nh, 1);
510 DPRINTF("AIFP: %p nh_ifp %p", nh->nh_aifp, nh->nh_ifp);
512 refcount_init(&nh_priv->nh_refcnt, 1);
514 /* Please see nhop_free() comments on the initial value */
515 refcount_init(&nh_priv->nh_linked, 2);
517 print_nhop("FINALIZE", nh);
519 if (link_nhop(ctl, nh_priv) == 0) {
522 * Adding nexthop to the datastructures
523 * failed. Call destructor w/o waiting for
524 * the epoch end, as nexthop is not used
527 DPRINTF("link_nhop failed!");
528 destroy_nhop(nh_priv);
537 print_nhop_sa(char *buf, size_t buflen, const struct sockaddr *sa)
540 if (sa->sa_family == AF_INET) {
541 const struct sockaddr_in *sin4;
542 sin4 = (const struct sockaddr_in *)sa;
543 inet_ntop(AF_INET, &sin4->sin_addr, buf, buflen);
544 } else if (sa->sa_family == AF_INET6) {
545 const struct sockaddr_in6 *sin6;
546 sin6 = (const struct sockaddr_in6 *)sa;
547 inet_ntop(AF_INET6, &sin6->sin6_addr, buf, buflen);
548 } else if (sa->sa_family == AF_LINK) {
549 const struct sockaddr_dl *sdl;
550 sdl = (const struct sockaddr_dl *)sa;
551 snprintf(buf, buflen, "if#%d", sdl->sdl_index);
553 snprintf(buf, buflen, "af:%d", sa->sa_family);
557 print_nhop(const char *prefix, const struct nhop_object *nh)
559 char src_buf[INET6_ADDRSTRLEN], addr_buf[INET6_ADDRSTRLEN];
561 print_nhop_sa(src_buf, sizeof(src_buf), nh->nh_ifa->ifa_addr);
562 print_nhop_sa(addr_buf, sizeof(addr_buf), &nh->gw_sa);
564 DPRINTF("%s nhop priv %p: AF %d ifp %p %s addr %s src %p %s aifp %p %s mtu %d nh_flags %X",
565 prefix, nh->nh_priv, nh->nh_priv->nh_family, nh->nh_ifp,
566 if_name(nh->nh_ifp), addr_buf, nh->nh_ifa, src_buf, nh->nh_aifp,
567 if_name(nh->nh_aifp), nh->nh_mtu, nh->nh_flags);
571 destroy_nhop(struct nhop_priv *nh_priv)
573 struct nhop_object *nh;
577 print_nhop("DEL", nh);
580 if_rele(nh->nh_aifp);
581 ifa_free(nh->nh_ifa);
582 counter_u64_free(nh->nh_pksent);
584 uma_zfree(nhops_zone, nh);
588 * Epoch callback indicating nhop is safe to destroy
591 destroy_nhop_epoch(epoch_context_t ctx)
593 struct nhop_priv *nh_priv;
595 nh_priv = __containerof(ctx, struct nhop_priv, nh_epoch_ctx);
597 destroy_nhop(nh_priv);
601 nhop_ref_object(struct nhop_object *nh)
604 return (refcount_acquire_if_not_zero(&nh->nh_priv->nh_refcnt));
608 nhop_free(struct nhop_object *nh)
610 struct nh_control *ctl;
611 struct nhop_priv *nh_priv = nh->nh_priv;
612 struct epoch_tracker et;
614 if (!refcount_release(&nh_priv->nh_refcnt))
618 * There are only 2 places, where nh_linked can be decreased:
619 * rib destroy (nhops_destroy_rib) and this function.
620 * nh_link can never be increased.
622 * Hence, use initial value of 2 to make use of
623 * refcount_release_if_not_last().
625 * There can be two scenarious when calling this function:
627 * 1) nh_linked value is 2. This means that either
628 * nhops_destroy_rib() has not been called OR it is running,
629 * but we are guaranteed that nh_control won't be freed in
630 * this epoch. Hence, nexthop can be safely unlinked.
632 * 2) nh_linked value is 1. In that case, nhops_destroy_rib()
633 * has been called and nhop unlink can be skipped.
637 if (refcount_release_if_not_last(&nh_priv->nh_linked)) {
638 ctl = nh_priv->nh_control;
639 if (unlink_nhop(ctl, nh_priv) == NULL) {
640 /* Do not try to reclaim */
641 DPRINTF("Failed to unlink nexhop %p", nh_priv);
648 epoch_call(net_epoch_preempt, destroy_nhop_epoch,
649 &nh_priv->nh_epoch_ctx);
653 nhop_ref_any(struct nhop_object *nh)
656 return (nhop_ref_object(nh));
660 nhop_free_any(struct nhop_object *nh)
667 /* Helper functions */
670 nhop_get_idx(const struct nhop_object *nh)
673 return (nh->nh_priv->nh_idx);
677 nhop_get_type(const struct nhop_object *nh)
680 return (nh->nh_priv->nh_type);
684 nhop_set_type(struct nhop_object *nh, enum nhop_type nh_type)
687 nh->nh_priv->nh_type = nh_type;
691 nhop_get_rtflags(const struct nhop_object *nh)
694 return (nh->nh_priv->rt_flags);
698 nhop_set_rtflags(struct nhop_object *nh, int rt_flags)
701 nh->nh_priv->rt_flags = rt_flags;
705 nhop_get_vnet(const struct nhop_object *nh)
708 return (nh->nh_priv->nh_vnet);
712 nhops_update_ifmtu(struct rib_head *rh, struct ifnet *ifp, uint32_t mtu)
714 struct nh_control *ctl;
715 struct nhop_priv *nh_priv;
716 struct nhop_object *nh;
718 ctl = rh->nh_control;
721 CHT_SLIST_FOREACH(&ctl->nh_head, nhops, nh_priv) {
723 if (nh->nh_ifp == ifp) {
724 if ((nh_priv->rt_flags & RTF_FIXEDMTU) == 0 ||
726 /* Update MTU directly */
730 } CHT_SLIST_FOREACH_END;
736 * Dumps a single entry to sysctl buffer.
739 * rt_msghdr - generic RTM header to allow users to skip non-understood messages
740 * nhop_external - nexhop description structure (with length)
741 * nhop_addrs - structure encapsulating GW/SRC sockaddrs
744 dump_nhop_entry(struct rib_head *rh, struct nhop_object *nh, struct sysctl_req *w)
747 struct rt_msghdr rtm;
748 struct nhop_external nhe;
749 struct nhop_addrs na;
751 struct nhop_external *pnhe;
752 struct sockaddr *gw_sa, *src_sa;
753 struct sockaddr_storage ss;
757 //DPRINTF("Dumping: head %p nh %p flags %X req %p\n", rh, nh, nh->nh_flags, w);
759 memset(&arpc, 0, sizeof(arpc));
761 arpc.rtm.rtm_msglen = sizeof(arpc);
762 arpc.rtm.rtm_version = RTM_VERSION;
763 arpc.rtm.rtm_type = RTM_GET;
764 //arpc.rtm.rtm_flags = RTF_UP;
765 arpc.rtm.rtm_flags = nh->nh_priv->rt_flags;
769 pnhe->nh_len = sizeof(struct nhop_external);
770 pnhe->nh_idx = nh->nh_priv->nh_idx;
771 pnhe->nh_fib = rh->rib_fibnum;
772 pnhe->ifindex = nh->nh_ifp->if_index;
773 pnhe->aifindex = nh->nh_aifp->if_index;
774 pnhe->nh_family = nh->nh_priv->nh_family;
775 pnhe->nh_type = nh->nh_priv->nh_type;
776 pnhe->nh_mtu = nh->nh_mtu;
777 pnhe->nh_flags = nh->nh_flags;
779 memcpy(pnhe->nh_prepend, nh->nh_prepend, sizeof(nh->nh_prepend));
780 pnhe->prepend_len = nh->nh_prepend_len;
781 pnhe->nh_refcount = nh->nh_priv->nh_refcnt;
782 pnhe->nh_pksent = counter_u64_fetch(nh->nh_pksent);
784 /* sockaddr container */
785 addrs_len = sizeof(struct nhop_addrs);
786 arpc.na.gw_sa_off = addrs_len;
787 gw_sa = (struct sockaddr *)&nh->gw4_sa;
788 addrs_len += gw_sa->sa_len;
790 src_sa = nh->nh_ifa->ifa_addr;
791 if (src_sa->sa_family == AF_LINK) {
792 /* Shorten structure */
793 memset(&ss, 0, sizeof(struct sockaddr_storage));
794 fill_sdl_from_ifp((struct sockaddr_dl_short *)&ss,
795 nh->nh_ifa->ifa_ifp);
796 src_sa = (struct sockaddr *)&ss;
798 arpc.na.src_sa_off = addrs_len;
799 addrs_len += src_sa->sa_len;
801 /* Write total container length */
802 arpc.na.na_len = addrs_len;
804 arpc.rtm.rtm_msglen += arpc.na.na_len - sizeof(struct nhop_addrs);
806 error = SYSCTL_OUT(w, &arpc, sizeof(arpc));
808 error = SYSCTL_OUT(w, gw_sa, gw_sa->sa_len);
810 error = SYSCTL_OUT(w, src_sa, src_sa->sa_len);
816 nhops_dump_sysctl(struct rib_head *rh, struct sysctl_req *w)
818 struct nh_control *ctl;
819 struct nhop_priv *nh_priv;
822 ctl = rh->nh_control;
825 DPRINTF("NHDUMP: count=%u", ctl->nh_head.items_count);
826 CHT_SLIST_FOREACH(&ctl->nh_head, nhops, nh_priv) {
827 error = dump_nhop_entry(rh, nh_priv->nh, w);
832 } CHT_SLIST_FOREACH_END;