/*- * SPDX-License-Identifier: BSD-2-Clause-FreeBSD * * Copyright (c) 2020 Alexander V. Chernikov * * 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. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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. */ #include __FBSDID("$FreeBSD$"); #include "opt_inet.h" #include "opt_inet6.h" #include "opt_route.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define DEBUG_MOD_NAME nhop_ctl #define DEBUG_MAX_LEVEL LOG_DEBUG #include _DECLARE_DEBUG(LOG_INFO); /* * This file contains core functionality for the nexthop ("nhop") route subsystem. * The business logic needed to create nexhop objects is implemented here. * * Nexthops in the original sense are the objects containing all the necessary * information to forward the packet to the selected destination. * In particular, nexthop is defined by a combination of * ifp, ifa, aifp, mtu, gw addr(if set), nh_type, nh_upper_family, mask of rt_flags and * NHF_DEFAULT * * Additionally, each nexthop gets assigned its unique index (nexthop index). * It serves two purposes: first one is to ease the ability of userland programs to * reference nexthops by their index. The second one allows lookup algorithms to * to store index instead of pointer (2 bytes vs 8) as a lookup result. * All nexthops are stored in the resizable hash table. * * Basically, this file revolves around supporting 3 functions: * 1) nhop_create_from_info / nhop_create_from_nhop, which contains all * business logic on filling the nexthop fields based on the provided request. * 2) nhop_get(), which gets a usable referenced nexthops. * * Conventions: * 1) non-exported functions start with verb * 2) exported function starts with the subsystem prefix: "nhop" */ static int dump_nhop_entry(struct rib_head *rh, struct nhop_object *nh, struct sysctl_req *w); static struct nhop_priv *alloc_nhop_structure(void); static int get_nhop(struct rib_head *rnh, struct rt_addrinfo *info, struct nhop_priv **pnh_priv); static int finalize_nhop(struct nh_control *ctl, struct rt_addrinfo *info, struct nhop_priv *nh_priv); static struct ifnet *get_aifp(const struct nhop_object *nh); static void fill_sdl_from_ifp(struct sockaddr_dl_short *sdl, const struct ifnet *ifp); static void destroy_nhop_epoch(epoch_context_t ctx); static void destroy_nhop(struct nhop_priv *nh_priv); _Static_assert(__offsetof(struct nhop_object, nh_ifp) == 32, "nhop_object: wrong nh_ifp offset"); _Static_assert(sizeof(struct nhop_object) <= 128, "nhop_object: size exceeds 128 bytes"); static uma_zone_t nhops_zone; /* Global zone for each and every nexthop */ #define NHOP_OBJECT_ALIGNED_SIZE roundup2(sizeof(struct nhop_object), \ 2 * CACHE_LINE_SIZE) #define NHOP_PRIV_ALIGNED_SIZE roundup2(sizeof(struct nhop_priv), \ 2 * CACHE_LINE_SIZE) void nhops_init(void) { nhops_zone = uma_zcreate("routing nhops", NHOP_OBJECT_ALIGNED_SIZE + NHOP_PRIV_ALIGNED_SIZE, NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0); } /* * Fetches the interface of source address used by the route. * In all cases except interface-address-route it would be the * same as the transmit interfaces. * However, for the interface address this function will return * this interface ifp instead of loopback. This is needed to support * link-local IPv6 loopback communications. * * Returns found ifp. */ static struct ifnet * get_aifp(const struct nhop_object *nh) { struct ifnet *aifp = NULL; /* * Adjust the "outgoing" interface. If we're going to loop * the packet back to ourselves, the ifp would be the loopback * interface. However, we'd rather know the interface associated * to the destination address (which should probably be one of * our own addresses). */ if ((nh->nh_ifp->if_flags & IFF_LOOPBACK) && nh->gw_sa.sa_family == AF_LINK) { aifp = ifnet_byindex(nh->gwl_sa.sdl_index); if (aifp == NULL) { FIB_NH_LOG(LOG_WARNING, nh, "unable to get aifp for %s index %d", if_name(nh->nh_ifp), nh->gwl_sa.sdl_index); } } if (aifp == NULL) aifp = nh->nh_ifp; return (aifp); } int cmp_priv(const struct nhop_priv *_one, const struct nhop_priv *_two) { if (memcmp(_one->nh, _two->nh, NHOP_END_CMP) != 0) return (0); if (memcmp(_one, _two, NH_PRIV_END_CMP) != 0) return (0); return (1); } /* * Conditionally sets @nh mtu data based on the @info data. */ static void set_nhop_mtu_from_info(struct nhop_object *nh, const struct rt_addrinfo *info) { if (info->rti_mflags & RTV_MTU) { if (info->rti_rmx->rmx_mtu != 0) { /* * MTU was explicitly provided by user. * Keep it. */ nh->nh_priv->rt_flags |= RTF_FIXEDMTU; } else { /* * User explicitly sets MTU to 0. * Assume rollback to default. */ nh->nh_priv->rt_flags &= ~RTF_FIXEDMTU; } nh->nh_mtu = info->rti_rmx->rmx_mtu; } } /* * Fills in shorted link-level sockadd version suitable to be stored inside the * nexthop gateway buffer. */ static void fill_sdl_from_ifp(struct sockaddr_dl_short *sdl, const struct ifnet *ifp) { bzero(sdl, sizeof(struct sockaddr_dl_short)); sdl->sdl_family = AF_LINK; sdl->sdl_len = sizeof(struct sockaddr_dl_short); sdl->sdl_index = ifp->if_index; sdl->sdl_type = ifp->if_type; } static int set_nhop_gw_from_info(struct nhop_object *nh, struct rt_addrinfo *info) { struct sockaddr *gw; gw = info->rti_info[RTAX_GATEWAY]; KASSERT(gw != NULL, ("gw is NULL")); if ((gw->sa_family == AF_LINK) && !(info->rti_flags & RTF_GATEWAY)) { /* * Interface route with interface specified by the interface * index in sockadd_dl structure. It is used in the IPv6 loopback * output code, where we need to preserve the original interface * to maintain proper scoping. * Despite the fact that nexthop code stores original interface * in the separate field (nh_aifp, see below), write AF_LINK * compatible sa with shorter total length. */ struct sockaddr_dl *sdl = (struct sockaddr_dl *)gw; struct ifnet *ifp = ifnet_byindex(sdl->sdl_index); if (ifp == NULL) { FIB_NH_LOG(LOG_WARNING, nh, "invalid ifindex %d", sdl->sdl_index); return (EINVAL); } fill_sdl_from_ifp(&nh->gwl_sa, ifp); } else { /* * Multiple options here: * * 1) RTF_GATEWAY with IPv4/IPv6 gateway data * 2) Interface route with IPv4/IPv6 address of the * matching interface. Some routing daemons do that * instead of specifying ifindex in AF_LINK. * * In both cases, save the original nexthop to make the callers * happy. */ if (gw->sa_len > sizeof(struct sockaddr_in6)) { FIB_NH_LOG(LOG_WARNING, nh, "nhop SA size too big: AF %d len %u", gw->sa_family, gw->sa_len); return (ENOMEM); } memcpy(&nh->gw_sa, gw, gw->sa_len); } return (0); } static uint16_t convert_rt_to_nh_flags(int rt_flags) { uint16_t res; res = (rt_flags & RTF_REJECT) ? NHF_REJECT : 0; res |= (rt_flags & RTF_HOST) ? NHF_HOST : 0; res |= (rt_flags & RTF_BLACKHOLE) ? NHF_BLACKHOLE : 0; res |= (rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) ? NHF_REDIRECT : 0; res |= (rt_flags & RTF_BROADCAST) ? NHF_BROADCAST : 0; res |= (rt_flags & RTF_GATEWAY) ? NHF_GATEWAY : 0; return (res); } static int fill_nhop_from_info(struct nhop_priv *nh_priv, struct rt_addrinfo *info) { int error, rt_flags; struct nhop_object *nh; nh = nh_priv->nh; rt_flags = info->rti_flags & NHOP_RT_FLAG_MASK; nh->nh_priv->rt_flags = rt_flags; nh_priv->nh_upper_family = info->rti_info[RTAX_DST]->sa_family; nh_priv->nh_type = 0; // hook responsibility to set nhop type nh->nh_flags = convert_rt_to_nh_flags(rt_flags); set_nhop_mtu_from_info(nh, info); if ((error = set_nhop_gw_from_info(nh, info)) != 0) return (error); if (nh->gw_sa.sa_family == AF_LINK) nh_priv->nh_neigh_family = nh_priv->nh_upper_family; else nh_priv->nh_neigh_family = nh->gw_sa.sa_family; nh->nh_ifp = (info->rti_ifp != NULL) ? info->rti_ifp : info->rti_ifa->ifa_ifp; nh->nh_ifa = info->rti_ifa; /* depends on the gateway */ nh->nh_aifp = get_aifp(nh); /* * Note some of the remaining data is set by the * per-address-family pre-add hook. */ return (0); } /* * Creates a new nexthop based on the information in @info. * * Returns: * 0 on success, filling @nh_ret with the desired nexthop object ptr * errno otherwise */ int nhop_create_from_info(struct rib_head *rnh, struct rt_addrinfo *info, struct nhop_object **nh_ret) { struct nhop_priv *nh_priv; int error; NET_EPOCH_ASSERT(); if (info->rti_info[RTAX_GATEWAY] == NULL) return (EINVAL); nh_priv = alloc_nhop_structure(); error = fill_nhop_from_info(nh_priv, info); if (error != 0) { uma_zfree(nhops_zone, nh_priv->nh); return (error); } error = get_nhop(rnh, info, &nh_priv); if (error == 0) *nh_ret = nh_priv->nh; return (error); } /* * Gets linked nhop using the provided @pnh_priv nexhop data. * If linked nhop is found, returns it, freeing the provided one. * If there is no such nexthop, attaches the remaining data to the * provided nexthop and links it. * * Returns 0 on success, storing referenced nexthop in @pnh_priv. * Otherwise, errno is returned. */ static int get_nhop(struct rib_head *rnh, struct rt_addrinfo *info, struct nhop_priv **pnh_priv) { const struct sockaddr *dst, *netmask; struct nhop_priv *nh_priv, *tmp_priv; int error; nh_priv = *pnh_priv; /* Give the protocols chance to augment the request data */ dst = info->rti_info[RTAX_DST]; netmask = info->rti_info[RTAX_NETMASK]; error = rnh->rnh_preadd(rnh->rib_fibnum, dst, netmask, nh_priv->nh); if (error != 0) { uma_zfree(nhops_zone, nh_priv->nh); return (error); } tmp_priv = find_nhop(rnh->nh_control, nh_priv); if (tmp_priv != NULL) { uma_zfree(nhops_zone, nh_priv->nh); *pnh_priv = tmp_priv; return (0); } /* * Existing nexthop not found, need to create new one. * Note: multiple simultaneous get_nhop() requests * can result in multiple equal nexhops existing in the * nexthop table. This is not a not a problem until the * relative number of such nexthops is significant, which * is extremely unlikely. */ error = finalize_nhop(rnh->nh_control, info, nh_priv); if (error != 0) return (error); return (0); } /* * Update @nh with data supplied in @info. * This is a helper function to support route changes. * * It limits the changes that can be done to the route to the following: * 1) all combination of gateway changes (gw, interface, blackhole/reject) * 2) route flags (FLAG[123],STATIC,BLACKHOLE,REJECT) * 3) route MTU * * Returns: * 0 on success */ static int alter_nhop_from_info(struct nhop_object *nh, struct rt_addrinfo *info) { struct nhop_priv *nh_priv = nh->nh_priv; struct sockaddr *info_gw; int error; /* Update MTU if set in the request*/ set_nhop_mtu_from_info(nh, info); /* XXX: allow only one of BLACKHOLE,REJECT,GATEWAY */ /* Allow some flags (FLAG1,STATIC,BLACKHOLE,REJECT) to be toggled on change. */ nh_priv->rt_flags &= ~RTF_FMASK; nh_priv->rt_flags |= info->rti_flags & RTF_FMASK; /* Consider gateway change */ info_gw = info->rti_info[RTAX_GATEWAY]; if (info_gw != NULL) { error = set_nhop_gw_from_info(nh, info); if (error != 0) return (error); if (nh->gw_sa.sa_family == AF_LINK) nh_priv->nh_neigh_family = nh_priv->nh_upper_family; else nh_priv->nh_neigh_family = nh->gw_sa.sa_family; /* Update RTF_GATEWAY flag status */ nh_priv->rt_flags &= ~RTF_GATEWAY; nh_priv->rt_flags |= (RTF_GATEWAY & info->rti_flags); } /* Update datapath flags */ nh->nh_flags = convert_rt_to_nh_flags(nh_priv->rt_flags); if (info->rti_ifa != NULL) nh->nh_ifa = info->rti_ifa; if (info->rti_ifp != NULL) nh->nh_ifp = info->rti_ifp; nh->nh_aifp = get_aifp(nh); return (0); } /* * Creates new nexthop based on @nh_orig and augmentation data from @info. * Helper function used in the route changes, please see * alter_nhop_from_info() comments for more details. * * Returns: * 0 on success, filling @nh_ret with the desired nexthop object * errno otherwise */ int nhop_create_from_nhop(struct rib_head *rnh, const struct nhop_object *nh_orig, struct rt_addrinfo *info, struct nhop_object **pnh) { struct nhop_priv *nh_priv; struct nhop_object *nh; int error; NET_EPOCH_ASSERT(); nh_priv = alloc_nhop_structure(); nh = nh_priv->nh; /* Start with copying data from original nexthop */ nh_priv->nh_upper_family = nh_orig->nh_priv->nh_upper_family; nh_priv->nh_neigh_family = nh_orig->nh_priv->nh_neigh_family; nh_priv->rt_flags = nh_orig->nh_priv->rt_flags; nh_priv->nh_type = nh_orig->nh_priv->nh_type; nh_priv->nh_fibnum = nh_orig->nh_priv->nh_fibnum; nh->nh_ifp = nh_orig->nh_ifp; nh->nh_ifa = nh_orig->nh_ifa; nh->nh_aifp = nh_orig->nh_aifp; nh->nh_mtu = nh_orig->nh_mtu; nh->nh_flags = nh_orig->nh_flags; memcpy(&nh->gw_sa, &nh_orig->gw_sa, nh_orig->gw_sa.sa_len); error = alter_nhop_from_info(nh, info); if (error != 0) { uma_zfree(nhops_zone, nh_priv->nh); return (error); } error = get_nhop(rnh, info, &nh_priv); if (error == 0) *pnh = nh_priv->nh; return (error); } /* * Allocates memory for public/private nexthop structures. * * Returns pointer to nhop_priv or NULL. */ static struct nhop_priv * alloc_nhop_structure() { struct nhop_object *nh; struct nhop_priv *nh_priv; nh = (struct nhop_object *)uma_zalloc(nhops_zone, M_NOWAIT | M_ZERO); if (nh == NULL) return (NULL); nh_priv = (struct nhop_priv *)((char *)nh + NHOP_OBJECT_ALIGNED_SIZE); nh->nh_priv = nh_priv; nh_priv->nh = nh; return (nh_priv); } static bool reference_nhop_deps(struct nhop_object *nh) { if (!ifa_try_ref(nh->nh_ifa)) return (false); nh->nh_aifp = get_aifp(nh); if (!if_try_ref(nh->nh_aifp)) { ifa_free(nh->nh_ifa); return (false); } FIB_NH_LOG(LOG_DEBUG, nh, "AIFP: %p nh_ifp %p", nh->nh_aifp, nh->nh_ifp); if (!if_try_ref(nh->nh_ifp)) { ifa_free(nh->nh_ifa); if_rele(nh->nh_aifp); return (false); } return (true); } /* * Alocates/references the remaining bits of nexthop data and links * it to the hash table. * Returns 0 if successful, * errno otherwise. @nh_priv is freed in case of error. */ static int finalize_nhop(struct nh_control *ctl, struct rt_addrinfo *info, struct nhop_priv *nh_priv) { struct nhop_object *nh = nh_priv->nh; /* Allocate per-cpu packet counter */ nh->nh_pksent = counter_u64_alloc(M_NOWAIT); if (nh->nh_pksent == NULL) { uma_zfree(nhops_zone, nh); RTSTAT_INC(rts_nh_alloc_failure); FIB_NH_LOG(LOG_WARNING, nh, "counter_u64_alloc() failed"); return (ENOMEM); } if (!reference_nhop_deps(nh)) { counter_u64_free(nh->nh_pksent); uma_zfree(nhops_zone, nh); RTSTAT_INC(rts_nh_alloc_failure); FIB_NH_LOG(LOG_WARNING, nh, "interface reference failed"); return (EAGAIN); } /* Save vnet to ease destruction */ nh_priv->nh_vnet = curvnet; refcount_init(&nh_priv->nh_refcnt, 1); /* Please see nhop_free() comments on the initial value */ refcount_init(&nh_priv->nh_linked, 2); nh_priv->nh_fibnum = ctl->ctl_rh->rib_fibnum; if (link_nhop(ctl, nh_priv) == 0) { /* * Adding nexthop to the datastructures * failed. Call destructor w/o waiting for * the epoch end, as nexthop is not used * and return. */ char nhbuf[NHOP_PRINT_BUFSIZE]; FIB_NH_LOG(LOG_WARNING, nh, "failed to link %s", nhop_print_buf(nh, nhbuf, sizeof(nhbuf))); destroy_nhop(nh_priv); return (ENOBUFS); } #if DEBUG_MAX_LEVEL >= LOG_DEBUG char nhbuf[NHOP_PRINT_BUFSIZE]; FIB_NH_LOG(LOG_DEBUG, nh, "finalized: %s", nhop_print_buf(nh, nhbuf, sizeof(nhbuf))); #endif return (0); } static void destroy_nhop(struct nhop_priv *nh_priv) { struct nhop_object *nh; nh = nh_priv->nh; if_rele(nh->nh_ifp); if_rele(nh->nh_aifp); ifa_free(nh->nh_ifa); counter_u64_free(nh->nh_pksent); uma_zfree(nhops_zone, nh); } /* * Epoch callback indicating nhop is safe to destroy */ static void destroy_nhop_epoch(epoch_context_t ctx) { struct nhop_priv *nh_priv; nh_priv = __containerof(ctx, struct nhop_priv, nh_epoch_ctx); destroy_nhop(nh_priv); } void nhop_ref_object(struct nhop_object *nh) { u_int old __diagused; old = refcount_acquire(&nh->nh_priv->nh_refcnt); KASSERT(old > 0, ("%s: nhop object %p has 0 refs", __func__, nh)); } int nhop_try_ref_object(struct nhop_object *nh) { return (refcount_acquire_if_not_zero(&nh->nh_priv->nh_refcnt)); } void nhop_free(struct nhop_object *nh) { struct nh_control *ctl; struct nhop_priv *nh_priv = nh->nh_priv; struct epoch_tracker et; if (!refcount_release(&nh_priv->nh_refcnt)) return; #if DEBUG_MAX_LEVEL >= LOG_DEBUG char nhbuf[NHOP_PRINT_BUFSIZE]; FIB_NH_LOG(LOG_DEBUG, nh, "deleting %s", nhop_print_buf(nh, nhbuf, sizeof(nhbuf))); #endif /* * There are only 2 places, where nh_linked can be decreased: * rib destroy (nhops_destroy_rib) and this function. * nh_link can never be increased. * * Hence, use initial value of 2 to make use of * refcount_release_if_not_last(). * * There can be two scenarious when calling this function: * * 1) nh_linked value is 2. This means that either * nhops_destroy_rib() has not been called OR it is running, * but we are guaranteed that nh_control won't be freed in * this epoch. Hence, nexthop can be safely unlinked. * * 2) nh_linked value is 1. In that case, nhops_destroy_rib() * has been called and nhop unlink can be skipped. */ NET_EPOCH_ENTER(et); if (refcount_release_if_not_last(&nh_priv->nh_linked)) { ctl = nh_priv->nh_control; if (unlink_nhop(ctl, nh_priv) == NULL) { /* Do not try to reclaim */ char nhbuf[NHOP_PRINT_BUFSIZE]; FIB_NH_LOG(LOG_WARNING, nh, "failed to unlink %s", nhop_print_buf(nh, nhbuf, sizeof(nhbuf))); NET_EPOCH_EXIT(et); return; } } NET_EPOCH_EXIT(et); epoch_call(net_epoch_preempt, destroy_nhop_epoch, &nh_priv->nh_epoch_ctx); } void nhop_ref_any(struct nhop_object *nh) { #ifdef ROUTE_MPATH if (!NH_IS_NHGRP(nh)) nhop_ref_object(nh); else nhgrp_ref_object((struct nhgrp_object *)nh); #else nhop_ref_object(nh); #endif } void nhop_free_any(struct nhop_object *nh) { #ifdef ROUTE_MPATH if (!NH_IS_NHGRP(nh)) nhop_free(nh); else nhgrp_free((struct nhgrp_object *)nh); #else nhop_free(nh); #endif } /* Helper functions */ uint32_t nhop_get_idx(const struct nhop_object *nh) { return (nh->nh_priv->nh_idx); } enum nhop_type nhop_get_type(const struct nhop_object *nh) { return (nh->nh_priv->nh_type); } void nhop_set_type(struct nhop_object *nh, enum nhop_type nh_type) { nh->nh_priv->nh_type = nh_type; } int nhop_get_rtflags(const struct nhop_object *nh) { return (nh->nh_priv->rt_flags); } void nhop_set_rtflags(struct nhop_object *nh, int rt_flags) { nh->nh_priv->rt_flags = rt_flags; } struct vnet * nhop_get_vnet(const struct nhop_object *nh) { return (nh->nh_priv->nh_vnet); } struct nhop_object * nhop_select_func(struct nhop_object *nh, uint32_t flowid) { return (nhop_select(nh, flowid)); } /* * Returns address family of the traffic uses the nexthop. */ int nhop_get_upper_family(const struct nhop_object *nh) { return (nh->nh_priv->nh_upper_family); } /* * Returns address family of the LLE or gateway that is used * to forward the traffic to. */ int nhop_get_neigh_family(const struct nhop_object *nh) { return (nh->nh_priv->nh_neigh_family); } uint32_t nhop_get_fibnum(const struct nhop_object *nh) { return (nh->nh_priv->nh_fibnum); } void nhops_update_ifmtu(struct rib_head *rh, struct ifnet *ifp, uint32_t mtu) { struct nh_control *ctl; struct nhop_priv *nh_priv; struct nhop_object *nh; ctl = rh->nh_control; NHOPS_WLOCK(ctl); CHT_SLIST_FOREACH(&ctl->nh_head, nhops, nh_priv) { nh = nh_priv->nh; if (nh->nh_ifp == ifp) { if ((nh_priv->rt_flags & RTF_FIXEDMTU) == 0 || nh->nh_mtu > mtu) { /* Update MTU directly */ nh->nh_mtu = mtu; } } } CHT_SLIST_FOREACH_END; NHOPS_WUNLOCK(ctl); } /* * Prints nexthop @nh data in the provided @buf. * Example: nh#33/inet/em0/192.168.0.1 */ char * nhop_print_buf(const struct nhop_object *nh, char *buf, size_t bufsize) { #if defined(INET) || defined(INET6) char abuf[INET6_ADDRSTRLEN]; #endif struct nhop_priv *nh_priv = nh->nh_priv; const char *upper_str = rib_print_family(nh->nh_priv->nh_upper_family); switch (nh->gw_sa.sa_family) { #ifdef INET case AF_INET: inet_ntop(AF_INET, &nh->gw4_sa.sin_addr, abuf, sizeof(abuf)); snprintf(buf, bufsize, "nh#%d/%s/%s/%s", nh_priv->nh_idx, upper_str, if_name(nh->nh_ifp), abuf); break; #endif #ifdef INET6 case AF_INET6: inet_ntop(AF_INET6, &nh->gw6_sa.sin6_addr, abuf, sizeof(abuf)); snprintf(buf, bufsize, "nh#%d/%s/%s/%s", nh_priv->nh_idx, upper_str, if_name(nh->nh_ifp), abuf); break; #endif case AF_LINK: snprintf(buf, bufsize, "nh#%d/%s/%s/resolve", nh_priv->nh_idx, upper_str, if_name(nh->nh_ifp)); break; default: snprintf(buf, bufsize, "nh#%d/%s/%s/????", nh_priv->nh_idx, upper_str, if_name(nh->nh_ifp)); break; } return (buf); } char * nhop_print_buf_any(const struct nhop_object *nh, char *buf, size_t bufsize) { #ifdef ROUTE_MPATH if (NH_IS_NHGRP(nh)) return (nhgrp_print_buf((const struct nhgrp_object *)nh, buf, bufsize)); else #endif return (nhop_print_buf(nh, buf, bufsize)); } /* * Dumps a single entry to sysctl buffer. * * Layout: * rt_msghdr - generic RTM header to allow users to skip non-understood messages * nhop_external - nexhop description structure (with length) * nhop_addrs - structure encapsulating GW/SRC sockaddrs */ static int dump_nhop_entry(struct rib_head *rh, struct nhop_object *nh, struct sysctl_req *w) { struct { struct rt_msghdr rtm; struct nhop_external nhe; struct nhop_addrs na; } arpc; struct nhop_external *pnhe; struct sockaddr *gw_sa, *src_sa; struct sockaddr_storage ss; size_t addrs_len; int error; memset(&arpc, 0, sizeof(arpc)); arpc.rtm.rtm_msglen = sizeof(arpc); arpc.rtm.rtm_version = RTM_VERSION; arpc.rtm.rtm_type = RTM_GET; //arpc.rtm.rtm_flags = RTF_UP; arpc.rtm.rtm_flags = nh->nh_priv->rt_flags; /* nhop_external */ pnhe = &arpc.nhe; pnhe->nh_len = sizeof(struct nhop_external); pnhe->nh_idx = nh->nh_priv->nh_idx; pnhe->nh_fib = rh->rib_fibnum; pnhe->ifindex = nh->nh_ifp->if_index; pnhe->aifindex = nh->nh_aifp->if_index; pnhe->nh_family = nh->nh_priv->nh_upper_family; pnhe->nh_type = nh->nh_priv->nh_type; pnhe->nh_mtu = nh->nh_mtu; pnhe->nh_flags = nh->nh_flags; memcpy(pnhe->nh_prepend, nh->nh_prepend, sizeof(nh->nh_prepend)); pnhe->prepend_len = nh->nh_prepend_len; pnhe->nh_refcount = nh->nh_priv->nh_refcnt; pnhe->nh_pksent = counter_u64_fetch(nh->nh_pksent); /* sockaddr container */ addrs_len = sizeof(struct nhop_addrs); arpc.na.gw_sa_off = addrs_len; gw_sa = (struct sockaddr *)&nh->gw4_sa; addrs_len += gw_sa->sa_len; src_sa = nh->nh_ifa->ifa_addr; if (src_sa->sa_family == AF_LINK) { /* Shorten structure */ memset(&ss, 0, sizeof(struct sockaddr_storage)); fill_sdl_from_ifp((struct sockaddr_dl_short *)&ss, nh->nh_ifa->ifa_ifp); src_sa = (struct sockaddr *)&ss; } arpc.na.src_sa_off = addrs_len; addrs_len += src_sa->sa_len; /* Write total container length */ arpc.na.na_len = addrs_len; arpc.rtm.rtm_msglen += arpc.na.na_len - sizeof(struct nhop_addrs); error = SYSCTL_OUT(w, &arpc, sizeof(arpc)); if (error == 0) error = SYSCTL_OUT(w, gw_sa, gw_sa->sa_len); if (error == 0) error = SYSCTL_OUT(w, src_sa, src_sa->sa_len); return (error); } uint32_t nhops_get_count(struct rib_head *rh) { struct nh_control *ctl; uint32_t count; ctl = rh->nh_control; NHOPS_RLOCK(ctl); count = ctl->nh_head.items_count; NHOPS_RUNLOCK(ctl); return (count); } int nhops_dump_sysctl(struct rib_head *rh, struct sysctl_req *w) { struct nh_control *ctl; struct nhop_priv *nh_priv; int error; ctl = rh->nh_control; NHOPS_RLOCK(ctl); #if DEBUG_MAX_LEVEL >= LOG_DEBUG FIB_LOG(LOG_DEBUG, rh->rib_fibnum, rh->rib_family, "dump %u items", ctl->nh_head.items_count); #endif CHT_SLIST_FOREACH(&ctl->nh_head, nhops, nh_priv) { error = dump_nhop_entry(rh, nh_priv->nh, w); if (error != 0) { NHOPS_RUNLOCK(ctl); return (error); } } CHT_SLIST_FOREACH_END; NHOPS_RUNLOCK(ctl); return (0); }