diff --git a/usr.bin/netstat/Makefile b/usr.bin/netstat/Makefile --- a/usr.bin/netstat/Makefile +++ b/usr.bin/netstat/Makefile @@ -6,6 +6,7 @@ PROG= netstat SRCS= if.c inet.c main.c mbuf.c mroute.c netisr.c nl_symbols.c route.c \ unix.c mroute6.c ipsec.c bpf.c pfkey.c sctp.c common.c nhops.c nhgrp.c \ + route_netlink.c \ nl_defs.h nl_symbols.c: nlist_symbols diff --git a/usr.bin/netstat/common.h b/usr.bin/netstat/common.h --- a/usr.bin/netstat/common.h +++ b/usr.bin/netstat/common.h @@ -45,11 +45,28 @@ const char *fmt_flags(const struct bits *p, int f); void print_flags_generic(int flags, const struct bits *pbits, const char *format, const char *tag_name); -int print_sockaddr(const char *name, struct sockaddr *sa, - struct sockaddr *mask, int flags, int width); +int p_sockaddr(const char *name, struct sockaddr *sa, struct sockaddr *mask, + int flags, int width); + +struct _wid { + int dst; + int gw; + int flags; + int pksent; + int mtu; + int iface; + int expire; +}; +void set_wid(int fam); +void pr_rthdr(int af1 __unused); +extern struct _wid wid; +void p_flags(int f, const char *format); + +bool p_rtable_netlink(int fibnum, int af); struct ifmap_entry { char ifname[IFNAMSIZ]; + uint32_t mtu; }; struct ifmap_entry *prepare_ifmap(size_t *ifmap_size); diff --git a/usr.bin/netstat/route.c b/usr.bin/netstat/route.c --- a/usr.bin/netstat/route.c +++ b/usr.bin/netstat/route.c @@ -106,7 +106,6 @@ #endif static void p_rtable_sysctl(int, int); static void p_rtentry_sysctl(const char *name, struct rt_msghdr *); -static void p_flags(int, const char *); static void domask(char *, size_t, u_long); @@ -143,7 +142,8 @@ if (fibnum) xo_emit(" ({L:fib}: {:fib/%d})", fibnum); xo_emit("\n"); - p_rtable_sysctl(fibnum, af); + if (!p_rtable_netlink(fibnum, af)) + p_rtable_sysctl(fibnum, af); xo_close_container("route-information"); } @@ -197,42 +197,48 @@ #define WID_IF_DEFAULT(af) ((af) == AF_INET6 ? 8 : (Wflag ? 10 : 8)) #endif /*INET6*/ -static int wid_dst; -static int wid_gw; -static int wid_flags; -static int wid_pksent; -static int wid_mtu; -static int wid_if; -static int wid_expire; +struct _wid wid; /* * Print header for routing table columns. */ -static void +void pr_rthdr(int af1 __unused) { if (Wflag) { xo_emit("{T:/%-*.*s} {T:/%-*.*s} {T:/%-*.*s} {T:/%*.*s} " "{T:/%*.*s} {T:/%*.*s} {T:/%*s}\n", - wid_dst, wid_dst, "Destination", - wid_gw, wid_gw, "Gateway", - wid_flags, wid_flags, "Flags", - wid_mtu, wid_mtu, "Nhop#", - wid_mtu, wid_mtu, "Mtu", - wid_if, wid_if, "Netif", - wid_expire, "Expire"); + wid.dst, wid.dst, "Destination", + wid.gw, wid.gw, "Gateway", + wid.flags, wid.flags, "Flags", + wid.mtu, wid.mtu, "Nhop#", + wid.mtu, wid.mtu, "Mtu", + wid.iface, wid.iface, "Netif", + wid.expire, "Expire"); } else { xo_emit("{T:/%-*.*s} {T:/%-*.*s} {T:/%-*.*s} {T:/%*.*s} " "{T:/%*s}\n", - wid_dst, wid_dst, "Destination", - wid_gw, wid_gw, "Gateway", - wid_flags, wid_flags, "Flags", - wid_if, wid_if, "Netif", - wid_expire, "Expire"); + wid.dst, wid.dst, "Destination", + wid.gw, wid.gw, "Gateway", + wid.flags, wid.flags, "Flags", + wid.iface, wid.iface, "Netif", + wid.expire, "Expire"); } } +void +set_wid(int fam) +{ + wid.dst = WID_DST_DEFAULT(fam); + wid.gw = WID_GW_DEFAULT(fam); + wid.flags = 6; + wid.pksent = 8; + wid.mtu = 6; + wid.iface = WID_IF_DEFAULT(fam); + wid.expire = 6; +} + static void p_rtable_sysctl(int fibnum, int af) { @@ -278,15 +284,8 @@ xo_close_instance("rt-family"); } need_table_close = true; - fam = sa->sa_family; - wid_dst = WID_DST_DEFAULT(fam); - wid_gw = WID_GW_DEFAULT(fam); - wid_flags = 6; - wid_pksent = 8; - wid_mtu = 6; - wid_if = WID_IF_DEFAULT(fam); - wid_expire = 6; + set_wid(fam); xo_open_instance("rt-family"); pr_family(fam); xo_open_list("rt-entry"); @@ -323,22 +322,22 @@ protrusion = p_sockaddr("destination", addr[RTAX_DST], addr[RTAX_NETMASK], - rtm->rtm_flags, wid_dst); + rtm->rtm_flags, wid.dst); protrusion = p_sockaddr("gateway", addr[RTAX_GATEWAY], NULL, RTF_HOST, - wid_gw - protrusion); + wid.gw - protrusion); snprintf(buffer, sizeof(buffer), "{[:-%d}{:flags/%%s}{]:} ", - wid_flags - protrusion); + wid.flags - protrusion); p_flags(rtm->rtm_flags, buffer); /* Output path weight as non-visual property */ xo_emit("{e:weight/%u}", rtm->rtm_rmx.rmx_weight); if (Wflag) { /* XXX: use=0? */ - xo_emit("{t:nhop/%*lu} ", wid_mtu, rtm->rtm_rmx.rmx_nhidx); + xo_emit("{t:nhop/%*lu} ", wid.mtu, rtm->rtm_rmx.rmx_nhidx); if (rtm->rtm_rmx.rmx_mtu != 0) - xo_emit("{t:mtu/%*lu} ", wid_mtu, rtm->rtm_rmx.rmx_mtu); + xo_emit("{t:mtu/%*lu} ", wid.mtu, rtm->rtm_rmx.rmx_mtu); else - xo_emit("{P:/%*s} ", wid_mtu, ""); + xo_emit("{P:/%*s} ", wid.mtu, ""); } memset(prettyname, 0, sizeof(prettyname)); @@ -350,15 +349,15 @@ } if (Wflag) - xo_emit("{t:interface-name/%*s}", wid_if, prettyname); + xo_emit("{t:interface-name/%*s}", wid.iface, prettyname); else - xo_emit("{t:interface-name/%*.*s}", wid_if, wid_if, + xo_emit("{t:interface-name/%*.*s}", wid.iface, wid.iface, prettyname); if (rtm->rtm_rmx.rmx_expire) { time_t expire_time; if ((expire_time = rtm->rtm_rmx.rmx_expire - uptime.tv_sec) > 0) - xo_emit(" {:expire-time/%*d}", wid_expire, + xo_emit(" {:expire-time/%*d}", wid.expire, (int)expire_time); } @@ -472,7 +471,7 @@ return (cp); } -static void +void p_flags(int f, const char *format) { diff --git a/usr.bin/netstat/route_netlink.c b/usr.bin/netstat/route_netlink.c new file mode 100644 --- /dev/null +++ b/usr.bin/netstat/route_netlink.c @@ -0,0 +1,490 @@ +/*- + * SPDX-License-Identifier: BSD-3-Clause + * + * Copyright (c) 1983, 1988, 1993 + * The Regents of the University of California. All rights reserved. + * + * 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. + * 3. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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 +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include +#include +#include + +#include +#include + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include "netstat.h" +#include "common.h" +#include "nl_defs.h" + + +static void p_rtentry_netlink(struct snl_state *ss, const char *name, struct nlmsghdr *hdr); + +static struct ifmap_entry *ifmap; +static size_t ifmap_size; + +struct nl_parsed_link { + uint32_t ifi_index; + uint32_t ifla_mtu; + char *ifla_ifname; +}; + +#define _IN(_field) offsetof(struct ifinfomsg, _field) +#define _OUT(_field) offsetof(struct nl_parsed_link, _field) +static struct snl_attr_parser ap_link[] = { + { .type = IFLA_IFNAME, .off = _OUT(ifla_ifname), .cb = snl_attr_get_string }, + { .type = IFLA_MTU, .off = _OUT(ifla_mtu), .cb = snl_attr_get_uint32 }, +}; +static struct snl_field_parser fp_link[] = { + {.off_in = _IN(ifi_index), .off_out = _OUT(ifi_index), .cb = snl_field_get_uint32 }, +}; +#undef _IN +#undef _OUT +SNL_DECLARE_PARSER(link_parser, struct ifinfomsg, fp_link, ap_link); + +/* Generate ifmap using netlink */ +static struct ifmap_entry * +prepare_ifmap_netlink(struct snl_state *ss, size_t *pifmap_size) +{ + struct { + struct nlmsghdr hdr; + struct ifinfomsg ifmsg; + } msg = { + .hdr.nlmsg_type = RTM_GETLINK, + .hdr.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST, + .hdr.nlmsg_seq = snl_get_seq(ss), + }; + msg.hdr.nlmsg_len = sizeof(msg); + + if (!snl_send(ss, &msg, sizeof(msg))) { + snl_free(ss); + return (NULL); + } + + struct ifmap_entry *ifmap = NULL; + uint32_t ifmap_size = 0; + struct nlmsghdr *hdr; + while ((hdr = snl_read_message(ss)) != NULL && hdr->nlmsg_type != NLMSG_DONE) { + if (hdr->nlmsg_seq != msg.hdr.nlmsg_seq) + continue; +/* + if (hdr->nlmsg_type == NLMSG_ERROR) + break; +*/ + struct nl_parsed_link link = {}; + if (!snl_parse_nlmsg(ss, hdr, &link_parser, &link)) + continue; + if (link.ifi_index >= ifmap_size) { + size_t size = roundup2(link.ifi_index + 1, 32) * sizeof(struct ifmap_entry); + if ((ifmap = realloc(ifmap, size)) == NULL) + errx(2, "realloc(%lu) failed", size); + memset(&ifmap[ifmap_size], 0, + size - ifmap_size * + sizeof(struct ifmap_entry)); + ifmap_size = roundup2(link.ifi_index + 1, 32); + } + if (*ifmap[link.ifi_index].ifname != '\0') + continue; + strlcpy(ifmap[link.ifi_index].ifname, link.ifla_ifname, IFNAMSIZ); + ifmap[link.ifi_index].mtu = link.ifla_mtu; + } + *pifmap_size = ifmap_size; + return (ifmap); +} + +struct rta_mpath_nh { + struct sockaddr *gw; + uint32_t ifindex; + uint8_t rtnh_flags; + uint8_t rtnh_weight; + uint32_t rtax_mtu; + uint32_t rta_knh_id; + uint32_t rta_rtflags; +}; + +#define _IN(_field) offsetof(struct rtnexthop, _field) +#define _OUT(_field) offsetof(struct rta_mpath_nh, _field) +static const struct snl_attr_parser nla_p_mp_rtmetrics[] = { + { .type = NL_RTAX_MTU, .off = _OUT(rtax_mtu), .cb = snl_attr_get_uint32 }, +}; +SNL_DECLARE_ATTR_PARSER(metrics_mp_parser, nla_p_mp_rtmetrics); + +static const struct snl_attr_parser psnh[] = { + { .type = NL_RTA_GATEWAY, .off = _OUT(gw), .cb = snl_attr_get_ip }, + { .type = NL_RTA_METRICS, .arg = &metrics_mp_parser, .cb = snl_attr_get_nested }, + { .type = NL_RTA_KNH_ID, .off = _OUT(rta_knh_id), .cb = snl_attr_get_uint32 }, + { .type = NL_RTA_RTFLAGS, .off = _OUT(gw), .cb = snl_attr_get_uint32 }, + { .type = NL_RTA_VIA, .off = _OUT(gw), .cb = snl_attr_get_ipvia }, +}; + +static const struct snl_field_parser fpnh[] = { + { .off_in = _IN(rtnh_flags), .off_out = _OUT(rtnh_flags), .cb = snl_field_get_uint8 }, + { .off_in = _IN(rtnh_hops), .off_out = _OUT(rtnh_weight), .cb = snl_field_get_uint8 }, + { .off_in = _IN(rtnh_ifindex), .off_out = _OUT(ifindex), .cb = snl_field_get_uint32 }, +}; +#undef _IN +#undef _OUT + +SNL_DECLARE_PARSER(mpath_parser, struct rtnexthop, fpnh, psnh); + +struct rta_mpath { + int num_nhops; + struct rta_mpath_nh nhops[0]; +}; + +static bool +nlattr_get_multipath(struct snl_state *ss, struct nlattr *nla, const void *arg, void *target) +{ + int data_len = nla->nla_len - sizeof(struct nlattr); + struct rtnexthop *rtnh; + + int max_nhops = data_len / sizeof(struct rtnexthop); + size_t sz = (max_nhops + 2) * sizeof(struct rta_mpath_nh); + + struct rta_mpath *mp = snl_allocz(ss, sz); + mp->num_nhops = 0; + + for (rtnh = (struct rtnexthop *)(nla + 1); data_len > 0; ) { + struct rta_mpath_nh *mpnh = &mp->nhops[mp->num_nhops++]; + + if (!snl_parse_header(ss, rtnh, rtnh->rtnh_len, &mpath_parser, mpnh)) + return (false); + + int len = NL_ITEM_ALIGN(rtnh->rtnh_len); + data_len -= len; + rtnh = (struct rtnexthop *)((char *)rtnh + len); + } + if (data_len != 0 || mp->num_nhops == 0) { + return (false); + } + + *((struct rta_mpath **)target) = mp; + return (true); +} + + +struct nl_parsed_route { + struct sockaddr *rta_dst; + struct sockaddr *rta_gw; + struct nlattr *rta_metrics; + struct rta_mpath *rta_multipath; + uint32_t rta_expires; + uint32_t rta_oif; + uint32_t rta_expire; + uint32_t rta_table; + uint32_t rta_knh_id; + uint32_t rta_rtflags; + uint32_t rtax_mtu; + uint32_t rtax_weight; + uint8_t rtm_family; + uint8_t rtm_type; + uint8_t rtm_protocol; + uint8_t rtm_dst_len; +}; + +#define _IN(_field) offsetof(struct rtmsg, _field) +#define _OUT(_field) offsetof(struct nl_parsed_route, _field) +static const struct snl_attr_parser nla_p_rtmetrics[] = { + { .type = NL_RTAX_MTU, .off = _OUT(rtax_mtu), .cb = snl_attr_get_uint32 }, +}; +SNL_DECLARE_ATTR_PARSER(metrics_parser, nla_p_rtmetrics); + +static const struct snl_attr_parser ps[] = { + { .type = NL_RTA_DST, .off = _OUT(rta_dst), .cb = snl_attr_get_ip }, + { .type = NL_RTA_OIF, .off = _OUT(rta_oif), .cb = snl_attr_get_uint32 }, + { .type = NL_RTA_GATEWAY, .off = _OUT(rta_gw), .cb = snl_attr_get_ip }, + { .type = NL_RTA_METRICS, .arg = &metrics_parser, .cb = snl_attr_get_nested }, + { .type = NL_RTA_MULTIPATH, .off = _OUT(rta_multipath), .cb = nlattr_get_multipath }, + { .type = NL_RTA_KNH_ID, .off = _OUT(rta_knh_id), .cb = snl_attr_get_uint32 }, + { .type = NL_RTA_RTFLAGS, .off = _OUT(rta_rtflags), .cb = snl_attr_get_uint32 }, + { .type = NL_RTA_TABLE, .off = _OUT(rta_table), .cb = snl_attr_get_uint32 }, + { .type = NL_RTA_VIA, .off = _OUT(rta_gw), .cb = snl_attr_get_ipvia }, + { .type = NL_RTA_EXPIRES, .off = _OUT(rta_expire), .cb = snl_attr_get_uint32 }, +}; + +static const struct snl_field_parser fprt[] = { + {.off_in = _IN(rtm_family), .off_out = _OUT(rtm_family), .cb = snl_field_get_uint8 }, + {.off_in = _IN(rtm_type), .off_out = _OUT(rtm_type), .cb = snl_field_get_uint8 }, + {.off_in = _IN(rtm_protocol), .off_out = _OUT(rtm_protocol), .cb = snl_field_get_uint8 }, + {.off_in = _IN(rtm_dst_len), .off_out = _OUT(rtm_dst_len), .cb = snl_field_get_uint8 }, +}; +#undef _IN +#undef _OUT +SNL_DECLARE_PARSER(rtm_parser, struct rtmsg, fprt, ps); + +#define RTF_UP 0x1 +#define RTF_GATEWAY 0x2 +#define RTF_HOST 0x4 +#define RTF_REJECT 0x8 +#define RTF_DYNAMIC 0x10 +#define RTF_STATIC 0x800 +#define RTF_BLACKHOLE 0x1000 +#define RTF_PROTO2 0x4000 +#define RTF_PROTO1 0x8000 +#define RTF_PROTO3 0x40000 +#define RTF_FIXEDMTU 0x80000 +#define RTF_PINNED 0x100000 + +static void +ip6_writemask(struct in6_addr *addr6, uint8_t mask) +{ + uint32_t *cp; + + for (cp = (uint32_t *)addr6; mask >= 32; mask -= 32) + *cp++ = 0xFFFFFFFF; + if (mask > 0) + *cp = htonl(mask ? ~((1 << (32 - mask)) - 1) : 0); +} + +static void +gen_mask(int family, int plen, struct sockaddr *sa) +{ + if (family == AF_INET6) { + struct sockaddr_in6 sin6 = { + .sin6_family = AF_INET6, + .sin6_len = sizeof(struct sockaddr_in6), + }; + ip6_writemask(&sin6.sin6_addr, plen); + *((struct sockaddr_in6 *)sa) = sin6; + } else if (family == AF_INET) { + struct sockaddr_in sin = { + .sin_family = AF_INET, + .sin_len = sizeof(struct sockaddr_in), + .sin_addr.s_addr = htonl(plen ? ~((1 << (32 - plen)) - 1) : 0), + }; + *((struct sockaddr_in *)sa) = sin; + } +} + +struct sockaddr_dl_short { + u_char sdl_len; /* Total length of sockaddr */ + u_char sdl_family; /* AF_LINK */ + u_short sdl_index; /* if != 0, system given index for interface */ + u_char sdl_type; /* interface type */ + u_char sdl_nlen; /* interface name length, no trailing 0 reqd. */ + u_char sdl_alen; /* link level address length */ + u_char sdl_slen; /* link layer selector length */ + char sdl_data[8]; /* unused */ +}; + +static void +p_path(struct nl_parsed_route *rt) +{ + struct sockaddr_in6 mask6; + struct sockaddr *pmask = (struct sockaddr *)&mask6; + char buffer[128]; + char prettyname[128]; + int protrusion; + + gen_mask(rt->rtm_family, rt->rtm_dst_len, pmask); + protrusion = p_sockaddr("destination", rt->rta_dst, pmask, rt->rta_rtflags, wid.dst); + protrusion = p_sockaddr("gateway", rt->rta_gw, NULL, RTF_HOST, + wid.gw - protrusion); + snprintf(buffer, sizeof(buffer), "{[:-%d}{:flags/%%s}{]:} ", + wid.flags - protrusion); + p_flags(rt->rta_rtflags | RTF_UP, buffer); + /* Output path weight as non-visual property */ + xo_emit("{e:weight/%u}", rt->rtax_weight); + + memset(prettyname, 0, sizeof(prettyname)); + if (rt->rta_oif < ifmap_size) { + strlcpy(prettyname, ifmap[rt->rta_oif].ifname, + sizeof(prettyname)); + if (*prettyname == '\0') + strlcpy(prettyname, "---", sizeof(prettyname)); + if (rt->rtax_mtu == 0) + rt->rtax_mtu = ifmap[rt->rta_oif].mtu; + } + + if (Wflag) { + /* XXX: use=0? */ + xo_emit("{t:nhop/%*lu} ", wid.mtu, rt->rta_knh_id); + + if (rt->rtax_mtu != 0) + xo_emit("{t:mtu/%*lu} ", wid.mtu, rt->rtax_mtu); + else { + /* use interface mtu */ + xo_emit("{P:/%*s} ", wid.mtu, ""); + } + + } + + if (Wflag) + xo_emit("{t:interface-name/%*s}", wid.iface, prettyname); + else + xo_emit("{t:interface-name/%*.*s}", wid.iface, wid.iface, + prettyname); + if (rt->rta_expires > 0) { + xo_emit(" {:expire-time/%*u}", wid.expire, rt->rta_expires); + } +} + +static void +p_rtentry_netlink(struct snl_state *ss, const char *name, struct nlmsghdr *hdr) +{ + + struct nl_parsed_route rt = {}; + if (!snl_parse_nlmsg(ss, hdr, &rtm_parser, &rt)) + return; + + if (rt.rta_multipath != NULL) { + uint32_t orig_rtflags = rt.rta_rtflags; + uint32_t orig_mtu = rt.rtax_mtu; + for (int i = 0; i < rt.rta_multipath->num_nhops; i++) { + struct rta_mpath_nh *nhop = &rt.rta_multipath->nhops[i]; + + rt.rta_gw = nhop->gw; + rt.rta_oif = nhop->ifindex; + rt.rtax_weight = nhop->rtnh_weight; + rt.rta_rtflags = nhop->rta_rtflags ? nhop->rta_rtflags : orig_rtflags; + rt.rta_knh_id = nhop->rta_knh_id; + rt.rtax_mtu = nhop->rtax_mtu ? nhop->rtax_mtu : orig_mtu; + + xo_open_instance(name); + p_path(&rt); + xo_emit("\n"); + xo_close_instance(name); + } + return; + } + + struct sockaddr_dl_short sdl_gw = { + .sdl_family = AF_LINK, + .sdl_len = sizeof(struct sockaddr_dl_short), + .sdl_index = rt.rta_oif, + }; + if (rt.rta_gw == NULL) + rt.rta_gw = (struct sockaddr *)&sdl_gw; + + xo_open_instance(name); + p_path(&rt); + xo_emit("\n"); + xo_close_instance(name); +} + +static const struct snl_hdr_parser *all_parsers[] = { + &link_parser, &metrics_mp_parser, &mpath_parser, &metrics_parser, &rtm_parser +}; + +bool +p_rtable_netlink(int fibnum, int af) +{ + int fam = AF_UNSPEC; + int need_table_close = false; + struct nlmsghdr *hdr; + + struct snl_state ss = {}; + + SNL_VERIFY_PARSERS(all_parsers); + + if (!snl_init(&ss, NETLINK_ROUTE)) + return (false); + + ifmap = prepare_ifmap_netlink(&ss, &ifmap_size); + + struct { + struct nlmsghdr hdr; + struct rtmsg rtmsg; + struct nlattr nla_fibnum; + uint32_t fibnum; + } msg = { + .hdr.nlmsg_type = RTM_GETROUTE, + .hdr.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST, + .hdr.nlmsg_seq = snl_get_seq(&ss), + .rtmsg.rtm_family = af, + .nla_fibnum.nla_len = sizeof(struct nlattr) + sizeof(uint32_t), + .nla_fibnum.nla_type = RTA_TABLE, + .fibnum = fibnum, + }; + msg.hdr.nlmsg_len = sizeof(msg); + + if (!snl_send(&ss, &msg, sizeof(msg))) { + snl_free(&ss); + return (false); + } + + xo_open_container("route-table"); + xo_open_list("rt-family"); + while ((hdr = snl_read_message(&ss)) != NULL && hdr->nlmsg_type != NLMSG_DONE) { + if (hdr->nlmsg_seq != msg.hdr.nlmsg_seq) + continue; + struct rtmsg *rtm = (struct rtmsg *)(hdr + 1); + /* Only print family first time. */ + if (fam != rtm->rtm_family) { + if (need_table_close) { + xo_close_list("rt-entry"); + xo_close_instance("rt-family"); + } + need_table_close = true; + fam = rtm->rtm_family; + set_wid(fam); + xo_open_instance("rt-family"); + pr_family(fam); + xo_open_list("rt-entry"); + pr_rthdr(fam); + } + p_rtentry_netlink(&ss, "rt-entry", hdr); + snl_clear_lb(&ss); + } + if (need_table_close) { + xo_close_list("rt-entry"); + xo_close_instance("rt-family"); + } + xo_close_list("rt-family"); + xo_close_container("route-table"); + snl_free(&ss); + return (true); +} + +