345 lines
9.4 KiB
C
345 lines
9.4 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 1983, 1988, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/protosw.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/sysctl.h>
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#include <sys/time.h>
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#include <net/ethernet.h>
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#include <net/if.h>
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#include <net/if_dl.h>
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#include <net/if_types.h>
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#include <netlink/netlink.h>
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#include <netlink/netlink_route.h>
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#include <netlink/netlink_snl.h>
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#include <netlink/netlink_snl_route.h>
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#include <netlink/netlink_snl_route_parsers.h>
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#include <netlink/netlink_snl_route_compat.h>
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#include <netinet/in.h>
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#include <netgraph/ng_socket.h>
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#include <arpa/inet.h>
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#include <ifaddrs.h>
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#include <libutil.h>
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#include <netdb.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdbool.h>
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#include <string.h>
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#include <sysexits.h>
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#include <unistd.h>
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#include <err.h>
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#include <libxo/xo.h>
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#include "netstat.h"
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#include "common.h"
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#include "nl_defs.h"
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static void p_rtentry_netlink(struct snl_state *ss, const char *name, struct nlmsghdr *hdr);
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static struct ifmap_entry *ifmap;
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static size_t ifmap_size;
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/* Generate ifmap using netlink */
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static struct ifmap_entry *
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prepare_ifmap_netlink(struct snl_state *ss, size_t *pifmap_size)
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{
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struct {
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struct nlmsghdr hdr;
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struct ifinfomsg ifmsg;
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} msg = {
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.hdr.nlmsg_type = RTM_GETLINK,
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.hdr.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST,
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.hdr.nlmsg_seq = snl_get_seq(ss),
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};
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msg.hdr.nlmsg_len = sizeof(msg);
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if (!snl_send_message(ss, &msg.hdr))
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return (NULL);
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struct ifmap_entry *ifmap = NULL;
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uint32_t ifmap_size = 0;
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struct nlmsghdr *hdr;
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struct snl_errmsg_data e = {};
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while ((hdr = snl_read_reply_multi(ss, msg.hdr.nlmsg_seq, &e)) != NULL) {
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struct snl_parsed_link_simple link = {};
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if (!snl_parse_nlmsg(ss, hdr, &snl_rtm_link_parser_simple, &link))
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continue;
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if (link.ifi_index >= ifmap_size) {
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size_t size = roundup2(link.ifi_index + 1, 32) * sizeof(struct ifmap_entry);
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if ((ifmap = realloc(ifmap, size)) == NULL)
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errx(2, "realloc(%zu) failed", size);
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memset(&ifmap[ifmap_size], 0,
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size - ifmap_size *
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sizeof(struct ifmap_entry));
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ifmap_size = roundup2(link.ifi_index + 1, 32);
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}
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if (*ifmap[link.ifi_index].ifname != '\0')
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continue;
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strlcpy(ifmap[link.ifi_index].ifname, link.ifla_ifname, IFNAMSIZ);
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ifmap[link.ifi_index].mtu = link.ifla_mtu;
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}
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*pifmap_size = ifmap_size;
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return (ifmap);
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}
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static void
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ip6_writemask(struct in6_addr *addr6, uint8_t mask)
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{
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uint32_t *cp;
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for (cp = (uint32_t *)addr6; mask >= 32; mask -= 32)
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*cp++ = 0xFFFFFFFF;
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if (mask > 0)
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*cp = htonl(mask ? ~((1 << (32 - mask)) - 1) : 0);
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}
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static void
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gen_mask(int family, int plen, struct sockaddr *sa)
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{
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if (family == AF_INET6) {
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struct sockaddr_in6 sin6 = {
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.sin6_family = AF_INET6,
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.sin6_len = sizeof(struct sockaddr_in6),
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};
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ip6_writemask(&sin6.sin6_addr, plen);
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*((struct sockaddr_in6 *)sa) = sin6;
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} else if (family == AF_INET) {
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struct sockaddr_in sin = {
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.sin_family = AF_INET,
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.sin_len = sizeof(struct sockaddr_in),
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.sin_addr.s_addr = htonl(plen ? ~((1 << (32 - plen)) - 1) : 0),
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};
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*((struct sockaddr_in *)sa) = sin;
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}
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}
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static void
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add_scopeid(struct sockaddr *sa, int ifindex)
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{
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if (sa->sa_family == AF_INET6) {
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struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa;
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if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))
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sin6->sin6_scope_id = ifindex;
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}
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}
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static void
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p_path(struct snl_parsed_route *rt, bool is_mpath)
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{
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struct sockaddr_in6 mask6;
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struct sockaddr *pmask = (struct sockaddr *)&mask6;
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char buffer[128];
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char prettyname[128];
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int protrusion;
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gen_mask(rt->rtm_family, rt->rtm_dst_len, pmask);
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add_scopeid(rt->rta_dst, rt->rta_oif);
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add_scopeid(rt->rta_gw, rt->rta_oif);
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protrusion = p_sockaddr("destination", rt->rta_dst, pmask, rt->rta_rtflags, wid.dst);
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protrusion = p_sockaddr("gateway", rt->rta_gw, NULL, RTF_HOST,
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wid.gw - protrusion);
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snprintf(buffer, sizeof(buffer), "{[:-%d}{:flags/%%s}{]:} ",
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wid.flags - protrusion);
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p_flags(rt->rta_rtflags | RTF_UP, buffer);
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/* Output path weight as non-visual property */
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xo_emit("{e:weight/%u}", rt->rtax_weight);
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if (is_mpath)
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xo_emit("{e:nhg-kidx/%u}", rt->rta_knh_id);
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else
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xo_emit("{e:nhop-kidx/%u}", rt->rta_knh_id);
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if (rt->rta_nh_id != 0) {
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if (is_mpath)
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xo_emit("{e:nhg-uidx/%u}", rt->rta_nh_id);
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else
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xo_emit("{e:nhop-uidx/%u}", rt->rta_nh_id);
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}
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memset(prettyname, 0, sizeof(prettyname));
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if (rt->rta_oif < ifmap_size) {
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strlcpy(prettyname, ifmap[rt->rta_oif].ifname,
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sizeof(prettyname));
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if (*prettyname == '\0')
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strlcpy(prettyname, "---", sizeof(prettyname));
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if (rt->rtax_mtu == 0)
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rt->rtax_mtu = ifmap[rt->rta_oif].mtu;
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}
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if (Wflag) {
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/* XXX: use=0? */
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xo_emit("{t:nhop/%*lu} ", wid.mtu, is_mpath ? 0 : rt->rta_knh_id);
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if (rt->rtax_mtu != 0)
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xo_emit("{t:mtu/%*lu} ", wid.mtu, rt->rtax_mtu);
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else {
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/* use interface mtu */
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xo_emit("{P:/%*s} ", wid.mtu, "");
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}
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}
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if (Wflag)
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xo_emit("{t:interface-name/%*s}", wid.iface, prettyname);
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else
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xo_emit("{t:interface-name/%*.*s}", wid.iface, wid.iface,
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prettyname);
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if (rt->rta_expires > 0) {
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xo_emit(" {:expire-time/%*u}", wid.expire, rt->rta_expires);
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}
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}
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static void
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p_rtentry_netlink(struct snl_state *ss, const char *name, struct nlmsghdr *hdr)
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{
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struct snl_parsed_route rt = {};
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if (!snl_parse_nlmsg(ss, hdr, &snl_rtm_route_parser, &rt))
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return;
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if (rt.rtax_weight == 0)
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rt.rtax_weight = rt_default_weight;
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if (rt.rta_multipath != NULL) {
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uint32_t orig_rtflags = rt.rta_rtflags;
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uint32_t orig_mtu = rt.rtax_mtu;
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for (int i = 0; i < rt.rta_multipath->num_nhops; i++) {
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struct rta_mpath_nh *nhop = &rt.rta_multipath->nhops[i];
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rt.rta_gw = nhop->gw;
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rt.rta_oif = nhop->ifindex;
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rt.rtax_weight = nhop->rtnh_weight;
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rt.rta_rtflags = nhop->rta_rtflags ? nhop->rta_rtflags : orig_rtflags;
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rt.rtax_mtu = nhop->rtax_mtu ? nhop->rtax_mtu : orig_mtu;
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xo_open_instance(name);
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p_path(&rt, true);
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xo_emit("\n");
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xo_close_instance(name);
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}
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return;
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}
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struct sockaddr_dl sdl_gw = {
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.sdl_family = AF_LINK,
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.sdl_len = sizeof(struct sockaddr_dl),
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.sdl_index = rt.rta_oif,
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};
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if (rt.rta_gw == NULL)
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rt.rta_gw = (struct sockaddr *)&sdl_gw;
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xo_open_instance(name);
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p_path(&rt, false);
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xo_emit("\n");
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xo_close_instance(name);
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}
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bool
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p_rtable_netlink(int fibnum, int af)
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{
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int fam = AF_UNSPEC;
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int need_table_close = false;
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struct nlmsghdr *hdr;
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struct snl_errmsg_data e = {};
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struct snl_state ss = {};
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if (!snl_init(&ss, NETLINK_ROUTE))
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return (false);
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ifmap = prepare_ifmap_netlink(&ss, &ifmap_size);
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if (ifmap == NULL) {
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snl_free(&ss);
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return (false);
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}
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struct {
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struct nlmsghdr hdr;
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struct rtmsg rtmsg;
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struct nlattr nla_fibnum;
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uint32_t fibnum;
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} msg = {
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.hdr.nlmsg_type = RTM_GETROUTE,
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.hdr.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST,
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.hdr.nlmsg_seq = snl_get_seq(&ss),
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.rtmsg.rtm_family = af,
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.nla_fibnum.nla_len = sizeof(struct nlattr) + sizeof(uint32_t),
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.nla_fibnum.nla_type = RTA_TABLE,
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.fibnum = fibnum,
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};
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msg.hdr.nlmsg_len = sizeof(msg);
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if (!snl_send_message(&ss, &msg.hdr)) {
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snl_free(&ss);
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return (false);
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}
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xo_open_container("route-table");
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xo_open_list("rt-family");
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while ((hdr = snl_read_reply_multi(&ss, msg.hdr.nlmsg_seq, &e)) != NULL) {
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struct rtmsg *rtm = (struct rtmsg *)(hdr + 1);
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/* Only print family first time. */
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if (fam != rtm->rtm_family) {
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if (need_table_close) {
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xo_close_list("rt-entry");
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xo_close_instance("rt-family");
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}
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need_table_close = true;
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fam = rtm->rtm_family;
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set_wid(fam);
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xo_open_instance("rt-family");
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pr_family(fam);
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xo_open_list("rt-entry");
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pr_rthdr(fam);
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}
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p_rtentry_netlink(&ss, "rt-entry", hdr);
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snl_clear_lb(&ss);
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}
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if (need_table_close) {
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xo_close_list("rt-entry");
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xo_close_instance("rt-family");
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}
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xo_close_list("rt-family");
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xo_close_container("route-table");
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snl_free(&ss);
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return (true);
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}
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