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);
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.
125 static struct ifnet *
126 get_aifp(const struct nhop_object *nh)
128 struct ifnet *aifp = NULL;
131 * Adjust the "outgoing" interface. If we're going to loop
132 * the packet back to ourselves, the ifp would be the loopback
133 * interface. However, we'd rather know the interface associated
134 * to the destination address (which should probably be one of
135 * our own addresses).
137 if ((nh->nh_ifp->if_flags & IFF_LOOPBACK) &&
138 nh->gw_sa.sa_family == AF_LINK) {
139 aifp = ifnet_byindex(nh->gwl_sa.sdl_index);
141 DPRINTF("unable to get aifp for %s index %d",
142 if_name(nh->nh_ifp), nh->gwl_sa.sdl_index);
153 cmp_priv(const struct nhop_priv *_one, const struct nhop_priv *_two)
156 if (memcmp(_one->nh, _two->nh, NHOP_END_CMP) != 0)
159 if (memcmp(_one, _two, NH_PRIV_END_CMP) != 0)
166 * Conditionally sets @nh mtu data based on the @info data.
169 set_nhop_mtu_from_info(struct nhop_object *nh, const struct rt_addrinfo *info)
172 if (info->rti_mflags & RTV_MTU) {
173 if (info->rti_rmx->rmx_mtu != 0) {
175 * MTU was explicitly provided by user.
179 nh->nh_priv->rt_flags |= RTF_FIXEDMTU;
182 * User explicitly sets MTU to 0.
183 * Assume rollback to default.
185 nh->nh_priv->rt_flags &= ~RTF_FIXEDMTU;
187 nh->nh_mtu = info->rti_rmx->rmx_mtu;
192 * Fills in shorted link-level sockadd version suitable to be stored inside the
193 * nexthop gateway buffer.
196 fill_sdl_from_ifp(struct sockaddr_dl_short *sdl, const struct ifnet *ifp)
199 bzero(sdl, sizeof(struct sockaddr_dl_short));
200 sdl->sdl_family = AF_LINK;
201 sdl->sdl_len = sizeof(struct sockaddr_dl_short);
202 sdl->sdl_index = ifp->if_index;
203 sdl->sdl_type = ifp->if_type;
207 set_nhop_gw_from_info(struct nhop_object *nh, struct rt_addrinfo *info)
211 gw = info->rti_info[RTAX_GATEWAY];
212 KASSERT(gw != NULL, ("gw is NULL"));
214 if ((gw->sa_family == AF_LINK) && !(info->rti_flags & RTF_GATEWAY)) {
217 * Interface route with interface specified by the interface
218 * index in sockadd_dl structure. It is used in the IPv6 loopback
219 * output code, where we need to preserve the original interface
220 * to maintain proper scoping.
221 * Despite the fact that nexthop code stores original interface
222 * in the separate field (nh_aifp, see below), write AF_LINK
223 * compatible sa with shorter total length.
225 struct sockaddr_dl *sdl = (struct sockaddr_dl *)gw;
226 struct ifnet *ifp = ifnet_byindex(sdl->sdl_index);
228 DPRINTF("invalid ifindex %d", sdl->sdl_index);
231 fill_sdl_from_ifp(&nh->gwl_sa, ifp);
235 * Multiple options here:
237 * 1) RTF_GATEWAY with IPv4/IPv6 gateway data
238 * 2) Interface route with IPv4/IPv6 address of the
239 * matching interface. Some routing daemons do that
240 * instead of specifying ifindex in AF_LINK.
242 * In both cases, save the original nexthop to make the callers
245 if (gw->sa_len > sizeof(struct sockaddr_in6)) {
246 DPRINTF("nhop SA size too big: AF %d len %u",
247 gw->sa_family, gw->sa_len);
250 memcpy(&nh->gw_sa, gw, gw->sa_len);
256 convert_rt_to_nh_flags(int rt_flags)
260 res = (rt_flags & RTF_REJECT) ? NHF_REJECT : 0;
261 res |= (rt_flags & RTF_HOST) ? NHF_HOST : 0;
262 res |= (rt_flags & RTF_BLACKHOLE) ? NHF_BLACKHOLE : 0;
263 res |= (rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) ? NHF_REDIRECT : 0;
264 res |= (rt_flags & RTF_BROADCAST) ? NHF_BROADCAST : 0;
265 res |= (rt_flags & RTF_GATEWAY) ? NHF_GATEWAY : 0;
271 fill_nhop_from_info(struct nhop_priv *nh_priv, struct rt_addrinfo *info)
274 struct nhop_object *nh;
278 rt_flags = info->rti_flags & NHOP_RT_FLAG_MASK;
280 nh->nh_priv->rt_flags = rt_flags;
281 nh_priv->nh_family = info->rti_info[RTAX_DST]->sa_family;
282 nh_priv->nh_type = 0; // hook responsibility to set nhop type
284 nh->nh_flags = convert_rt_to_nh_flags(rt_flags);
285 set_nhop_mtu_from_info(nh, info);
286 if ((error = set_nhop_gw_from_info(nh, info)) != 0)
289 nh->nh_ifp = info->rti_ifa->ifa_ifp;
290 nh->nh_ifa = info->rti_ifa;
291 /* depends on the gateway */
292 nh->nh_aifp = get_aifp(nh);
295 * Note some of the remaining data is set by the
296 * per-address-family pre-add hook.
303 * Creates a new nexthop based on the information in @info.
306 * 0 on success, filling @nh_ret with the desired nexthop object ptr
310 nhop_create_from_info(struct rib_head *rnh, struct rt_addrinfo *info,
311 struct nhop_object **nh_ret)
313 struct nhop_priv *nh_priv;
318 if (info->rti_info[RTAX_GATEWAY] == NULL)
321 nh_priv = alloc_nhop_structure();
323 error = fill_nhop_from_info(nh_priv, info);
325 uma_zfree(nhops_zone, nh_priv->nh);
329 error = get_nhop(rnh, info, &nh_priv);
331 *nh_ret = nh_priv->nh;
337 * Gets linked nhop using the provided @pnh_priv nexhop data.
338 * If linked nhop is found, returns it, freeing the provided one.
339 * If there is no such nexthop, attaches the remaining data to the
340 * provided nexthop and links it.
342 * Returns 0 on success, storing referenced nexthop in @pnh_priv.
343 * Otherwise, errno is returned.
346 get_nhop(struct rib_head *rnh, struct rt_addrinfo *info,
347 struct nhop_priv **pnh_priv)
349 const struct sockaddr *dst, *gateway, *netmask;
350 struct nhop_priv *nh_priv, *tmp_priv;
355 /* Give the protocols chance to augment the request data */
356 dst = info->rti_info[RTAX_DST];
357 netmask = info->rti_info[RTAX_NETMASK];
358 gateway = info->rti_info[RTAX_GATEWAY];
360 error = rnh->rnh_preadd(rnh->rib_fibnum, dst, netmask, nh_priv->nh);
362 uma_zfree(nhops_zone, nh_priv->nh);
366 tmp_priv = find_nhop(rnh->nh_control, nh_priv);
367 if (tmp_priv != NULL) {
368 uma_zfree(nhops_zone, nh_priv->nh);
369 *pnh_priv = tmp_priv;
374 * Existing nexthop not found, need to create new one.
375 * Note: multiple simultaneous get_nhop() requests
376 * can result in multiple equal nexhops existing in the
377 * nexthop table. This is not a not a problem until the
378 * relative number of such nexthops is significant, which
379 * is extremely unlikely.
382 error = finalize_nhop(rnh->nh_control, info, nh_priv);
390 * Update @nh with data supplied in @info.
391 * This is a helper function to support route changes.
393 * It limits the changes that can be done to the route to the following:
394 * 1) all combination of gateway changes (gw, interface, blackhole/reject)
395 * 2) route flags (FLAG[123],STATIC,BLACKHOLE,REJECT)
402 alter_nhop_from_info(struct nhop_object *nh, struct rt_addrinfo *info)
404 struct sockaddr *info_gw;
407 /* Update MTU if set in the request*/
408 set_nhop_mtu_from_info(nh, info);
410 /* XXX: allow only one of BLACKHOLE,REJECT,GATEWAY */
412 /* Allow some flags (FLAG1,STATIC,BLACKHOLE,REJECT) to be toggled on change. */
413 nh->nh_priv->rt_flags &= ~RTF_FMASK;
414 nh->nh_priv->rt_flags |= info->rti_flags & RTF_FMASK;
416 /* Consider gateway change */
417 info_gw = info->rti_info[RTAX_GATEWAY];
418 if (info_gw != NULL) {
419 error = set_nhop_gw_from_info(nh, info);
422 /* Update RTF_GATEWAY flag status */
423 nh->nh_priv->rt_flags &= ~RTF_GATEWAY;
424 nh->nh_priv->rt_flags |= (RTF_GATEWAY & info->rti_flags);
426 /* Update datapath flags */
427 nh->nh_flags = convert_rt_to_nh_flags(nh->nh_priv->rt_flags);
429 if (info->rti_ifa != NULL)
430 nh->nh_ifa = info->rti_ifa;
431 if (info->rti_ifp != NULL)
432 nh->nh_ifp = info->rti_ifp;
433 nh->nh_aifp = get_aifp(nh);
439 * Creates new nexthop based on @nh_orig and augmentation data from @info.
440 * Helper function used in the route changes, please see
441 * alter_nhop_from_info() comments for more details.
444 * 0 on success, filling @nh_ret with the desired nexthop object
448 nhop_create_from_nhop(struct rib_head *rnh, const struct nhop_object *nh_orig,
449 struct rt_addrinfo *info, struct nhop_object **pnh)
451 struct nhop_priv *nh_priv;
452 struct nhop_object *nh;
457 nh_priv = alloc_nhop_structure();
460 /* Start with copying data from original nexthop */
461 nh_priv->nh_family = nh_orig->nh_priv->nh_family;
462 nh_priv->rt_flags = nh_orig->nh_priv->rt_flags;
463 nh_priv->nh_type = nh_orig->nh_priv->nh_type;
465 nh->nh_ifp = nh_orig->nh_ifp;
466 nh->nh_ifa = nh_orig->nh_ifa;
467 nh->nh_aifp = nh_orig->nh_aifp;
468 nh->nh_mtu = nh_orig->nh_mtu;
469 nh->nh_flags = nh_orig->nh_flags;
470 memcpy(&nh->gw_sa, &nh_orig->gw_sa, nh_orig->gw_sa.sa_len);
472 error = alter_nhop_from_info(nh, info);
474 uma_zfree(nhops_zone, nh_priv->nh);
478 error = get_nhop(rnh, info, &nh_priv);
486 * Allocates memory for public/private nexthop structures.
488 * Returns pointer to nhop_priv or NULL.
490 static struct nhop_priv *
491 alloc_nhop_structure()
493 struct nhop_object *nh;
494 struct nhop_priv *nh_priv;
496 nh = (struct nhop_object *)uma_zalloc(nhops_zone, M_NOWAIT | M_ZERO);
499 nh_priv = (struct nhop_priv *)((char *)nh + NHOP_OBJECT_ALIGNED_SIZE);
501 nh->nh_priv = nh_priv;
508 reference_nhop_deps(struct nhop_object *nh)
510 if (!ifa_try_ref(nh->nh_ifa))
512 nh->nh_aifp = get_aifp(nh);
513 if (!if_try_ref(nh->nh_aifp)) {
514 ifa_free(nh->nh_ifa);
517 DPRINTF("AIFP: %p nh_ifp %p", nh->nh_aifp, nh->nh_ifp);
518 if (!if_try_ref(nh->nh_ifp)) {
519 ifa_free(nh->nh_ifa);
520 if_rele(nh->nh_aifp);
528 * Alocates/references the remaining bits of nexthop data and links
529 * it to the hash table.
530 * Returns 0 if successful,
531 * errno otherwise. @nh_priv is freed in case of error.
534 finalize_nhop(struct nh_control *ctl, struct rt_addrinfo *info,
535 struct nhop_priv *nh_priv)
537 struct nhop_object *nh = nh_priv->nh;
539 /* Allocate per-cpu packet counter */
540 nh->nh_pksent = counter_u64_alloc(M_NOWAIT);
541 if (nh->nh_pksent == NULL) {
542 uma_zfree(nhops_zone, nh);
543 RTSTAT_INC(rts_nh_alloc_failure);
544 DPRINTF("nh_alloc_finalize failed");
548 if (!reference_nhop_deps(nh)) {
549 counter_u64_free(nh->nh_pksent);
550 uma_zfree(nhops_zone, nh);
551 RTSTAT_INC(rts_nh_alloc_failure);
552 DPRINTF("nh_alloc_finalize failed - reference failure");
556 /* Save vnet to ease destruction */
557 nh_priv->nh_vnet = curvnet;
559 refcount_init(&nh_priv->nh_refcnt, 1);
561 /* Please see nhop_free() comments on the initial value */
562 refcount_init(&nh_priv->nh_linked, 2);
564 print_nhop("FINALIZE", nh);
566 if (link_nhop(ctl, nh_priv) == 0) {
568 * Adding nexthop to the datastructures
569 * failed. Call destructor w/o waiting for
570 * the epoch end, as nexthop is not used
573 DPRINTF("link_nhop failed!");
574 destroy_nhop(nh_priv);
583 print_nhop_sa(char *buf, size_t buflen, const struct sockaddr *sa)
586 if (sa->sa_family == AF_INET) {
587 const struct sockaddr_in *sin4;
588 sin4 = (const struct sockaddr_in *)sa;
589 inet_ntop(AF_INET, &sin4->sin_addr, buf, buflen);
590 } else if (sa->sa_family == AF_INET6) {
591 const struct sockaddr_in6 *sin6;
592 sin6 = (const struct sockaddr_in6 *)sa;
593 inet_ntop(AF_INET6, &sin6->sin6_addr, buf, buflen);
594 } else if (sa->sa_family == AF_LINK) {
595 const struct sockaddr_dl *sdl;
596 sdl = (const struct sockaddr_dl *)sa;
597 snprintf(buf, buflen, "if#%d", sdl->sdl_index);
599 snprintf(buf, buflen, "af:%d", sa->sa_family);
603 print_nhop(const char *prefix, const struct nhop_object *nh)
605 char src_buf[INET6_ADDRSTRLEN], addr_buf[INET6_ADDRSTRLEN];
607 print_nhop_sa(src_buf, sizeof(src_buf), nh->nh_ifa->ifa_addr);
608 print_nhop_sa(addr_buf, sizeof(addr_buf), &nh->gw_sa);
610 DPRINTF("%s nhop priv %p: AF %d ifp %p %s addr %s src %p %s aifp %p %s mtu %d nh_flags %X",
611 prefix, nh->nh_priv, nh->nh_priv->nh_family, nh->nh_ifp,
612 if_name(nh->nh_ifp), addr_buf, nh->nh_ifa, src_buf, nh->nh_aifp,
613 if_name(nh->nh_aifp), nh->nh_mtu, nh->nh_flags);
617 destroy_nhop(struct nhop_priv *nh_priv)
619 struct nhop_object *nh;
623 print_nhop("DEL", nh);
626 if_rele(nh->nh_aifp);
627 ifa_free(nh->nh_ifa);
628 counter_u64_free(nh->nh_pksent);
630 uma_zfree(nhops_zone, nh);
634 * Epoch callback indicating nhop is safe to destroy
637 destroy_nhop_epoch(epoch_context_t ctx)
639 struct nhop_priv *nh_priv;
641 nh_priv = __containerof(ctx, struct nhop_priv, nh_epoch_ctx);
643 destroy_nhop(nh_priv);
647 nhop_ref_object(struct nhop_object *nh)
651 old = refcount_acquire(&nh->nh_priv->nh_refcnt);
652 KASSERT(old > 0, ("%s: nhop object %p has 0 refs", __func__, nh));
656 nhop_try_ref_object(struct nhop_object *nh)
659 return (refcount_acquire_if_not_zero(&nh->nh_priv->nh_refcnt));
663 nhop_free(struct nhop_object *nh)
665 struct nh_control *ctl;
666 struct nhop_priv *nh_priv = nh->nh_priv;
667 struct epoch_tracker et;
669 if (!refcount_release(&nh_priv->nh_refcnt))
673 * There are only 2 places, where nh_linked can be decreased:
674 * rib destroy (nhops_destroy_rib) and this function.
675 * nh_link can never be increased.
677 * Hence, use initial value of 2 to make use of
678 * refcount_release_if_not_last().
680 * There can be two scenarious when calling this function:
682 * 1) nh_linked value is 2. This means that either
683 * nhops_destroy_rib() has not been called OR it is running,
684 * but we are guaranteed that nh_control won't be freed in
685 * this epoch. Hence, nexthop can be safely unlinked.
687 * 2) nh_linked value is 1. In that case, nhops_destroy_rib()
688 * has been called and nhop unlink can be skipped.
692 if (refcount_release_if_not_last(&nh_priv->nh_linked)) {
693 ctl = nh_priv->nh_control;
694 if (unlink_nhop(ctl, nh_priv) == NULL) {
695 /* Do not try to reclaim */
696 DPRINTF("Failed to unlink nexhop %p", nh_priv);
703 epoch_call(net_epoch_preempt, destroy_nhop_epoch,
704 &nh_priv->nh_epoch_ctx);
708 nhop_ref_any(struct nhop_object *nh)
711 if (!NH_IS_NHGRP(nh))
714 nhgrp_ref_object((struct nhgrp_object *)nh);
721 nhop_free_any(struct nhop_object *nh)
725 if (!NH_IS_NHGRP(nh))
728 nhgrp_free((struct nhgrp_object *)nh);
734 /* Helper functions */
737 nhop_get_idx(const struct nhop_object *nh)
740 return (nh->nh_priv->nh_idx);
744 nhop_get_type(const struct nhop_object *nh)
747 return (nh->nh_priv->nh_type);
751 nhop_set_type(struct nhop_object *nh, enum nhop_type nh_type)
754 nh->nh_priv->nh_type = nh_type;
758 nhop_get_rtflags(const struct nhop_object *nh)
761 return (nh->nh_priv->rt_flags);
765 nhop_set_rtflags(struct nhop_object *nh, int rt_flags)
768 nh->nh_priv->rt_flags = rt_flags;
772 nhop_get_vnet(const struct nhop_object *nh)
775 return (nh->nh_priv->nh_vnet);
779 nhop_select_func(struct nhop_object *nh, uint32_t flowid)
782 return (nhop_select(nh, flowid));
786 nhops_update_ifmtu(struct rib_head *rh, struct ifnet *ifp, uint32_t mtu)
788 struct nh_control *ctl;
789 struct nhop_priv *nh_priv;
790 struct nhop_object *nh;
792 ctl = rh->nh_control;
795 CHT_SLIST_FOREACH(&ctl->nh_head, nhops, nh_priv) {
797 if (nh->nh_ifp == ifp) {
798 if ((nh_priv->rt_flags & RTF_FIXEDMTU) == 0 ||
800 /* Update MTU directly */
804 } CHT_SLIST_FOREACH_END;
810 * Dumps a single entry to sysctl buffer.
813 * rt_msghdr - generic RTM header to allow users to skip non-understood messages
814 * nhop_external - nexhop description structure (with length)
815 * nhop_addrs - structure encapsulating GW/SRC sockaddrs
818 dump_nhop_entry(struct rib_head *rh, struct nhop_object *nh, struct sysctl_req *w)
821 struct rt_msghdr rtm;
822 struct nhop_external nhe;
823 struct nhop_addrs na;
825 struct nhop_external *pnhe;
826 struct sockaddr *gw_sa, *src_sa;
827 struct sockaddr_storage ss;
831 //DPRINTF("Dumping: head %p nh %p flags %X req %p\n", rh, nh, nh->nh_flags, w);
833 memset(&arpc, 0, sizeof(arpc));
835 arpc.rtm.rtm_msglen = sizeof(arpc);
836 arpc.rtm.rtm_version = RTM_VERSION;
837 arpc.rtm.rtm_type = RTM_GET;
838 //arpc.rtm.rtm_flags = RTF_UP;
839 arpc.rtm.rtm_flags = nh->nh_priv->rt_flags;
843 pnhe->nh_len = sizeof(struct nhop_external);
844 pnhe->nh_idx = nh->nh_priv->nh_idx;
845 pnhe->nh_fib = rh->rib_fibnum;
846 pnhe->ifindex = nh->nh_ifp->if_index;
847 pnhe->aifindex = nh->nh_aifp->if_index;
848 pnhe->nh_family = nh->nh_priv->nh_family;
849 pnhe->nh_type = nh->nh_priv->nh_type;
850 pnhe->nh_mtu = nh->nh_mtu;
851 pnhe->nh_flags = nh->nh_flags;
853 memcpy(pnhe->nh_prepend, nh->nh_prepend, sizeof(nh->nh_prepend));
854 pnhe->prepend_len = nh->nh_prepend_len;
855 pnhe->nh_refcount = nh->nh_priv->nh_refcnt;
856 pnhe->nh_pksent = counter_u64_fetch(nh->nh_pksent);
858 /* sockaddr container */
859 addrs_len = sizeof(struct nhop_addrs);
860 arpc.na.gw_sa_off = addrs_len;
861 gw_sa = (struct sockaddr *)&nh->gw4_sa;
862 addrs_len += gw_sa->sa_len;
864 src_sa = nh->nh_ifa->ifa_addr;
865 if (src_sa->sa_family == AF_LINK) {
866 /* Shorten structure */
867 memset(&ss, 0, sizeof(struct sockaddr_storage));
868 fill_sdl_from_ifp((struct sockaddr_dl_short *)&ss,
869 nh->nh_ifa->ifa_ifp);
870 src_sa = (struct sockaddr *)&ss;
872 arpc.na.src_sa_off = addrs_len;
873 addrs_len += src_sa->sa_len;
875 /* Write total container length */
876 arpc.na.na_len = addrs_len;
878 arpc.rtm.rtm_msglen += arpc.na.na_len - sizeof(struct nhop_addrs);
880 error = SYSCTL_OUT(w, &arpc, sizeof(arpc));
882 error = SYSCTL_OUT(w, gw_sa, gw_sa->sa_len);
884 error = SYSCTL_OUT(w, src_sa, src_sa->sa_len);
890 nhops_get_count(struct rib_head *rh)
892 struct nh_control *ctl;
895 ctl = rh->nh_control;
898 count = ctl->nh_head.items_count;
905 nhops_dump_sysctl(struct rib_head *rh, struct sysctl_req *w)
907 struct nh_control *ctl;
908 struct nhop_priv *nh_priv;
911 ctl = rh->nh_control;
914 DPRINTF("NHDUMP: count=%u", ctl->nh_head.items_count);
915 CHT_SLIST_FOREACH(&ctl->nh_head, nhops, nh_priv) {
916 error = dump_nhop_entry(rh, nh_priv->nh, w);
921 } CHT_SLIST_FOREACH_END;