00a9cf741d
For unknown reasons, IPv6 multicast addresses are linked to a first IPv6 address assigned to an interface. Due to the design, when removing a first address having multicast addresses, we need to save them to somewhere and later restore them once a new IPv6 address is activated. mkludge stuffs support the operations. This change links multicast addresses to an interface directly and throws the kludge away. Note that as usual some obsolete member variables remain for kvm(3) users. And also sysctl net.inet6.multicast_kludge remains to avoid breaking old ifmcstat. TODO: currently ifnet has a list of in6_multi but obviously the list should be protocol independent. Provide a common structure (if_multi or something) to handle in6_multi and in_multi together as well as ifaddr does for in_ifaddr and in6_ifaddr.
224 lines
6.0 KiB
C
224 lines
6.0 KiB
C
/* $NetBSD: ifmcstat.c,v 1.21 2017/02/23 07:57:10 ozaki-r Exp $ */
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/*
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* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
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* 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 project 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 PROJECT 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 PROJECT 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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__RCSID("$NetBSD: ifmcstat.c,v 1.21 2017/02/23 07:57:10 ozaki-r Exp $");
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#include <err.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <fcntl.h>
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#include <kvm.h>
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#include <nlist.h>
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#include <string.h>
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#include <limits.h>
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#include <util.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/sysctl.h>
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#include <net/if.h>
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#include <net/if_types.h>
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#include <net/if_dl.h>
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#include <netinet/in.h>
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#include <net/if_ether.h>
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#include <netinet/in_var.h>
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#include <arpa/inet.h>
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#include <netdb.h>
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static const char *inet6_n2a(void *);
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static void print_ether_mcast(u_short);
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static void print_inet6_mcast(u_short, const char *);
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static const char *
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inet6_n2a(void *p)
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{
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static char buf[NI_MAXHOST];
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struct sockaddr_in6 sin6;
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const int niflags = NI_NUMERICHOST;
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memset(&sin6, 0, sizeof(sin6));
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sin6.sin6_family = AF_INET6;
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sin6.sin6_len = sizeof(struct sockaddr_in6);
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memcpy(&sin6.sin6_addr, p, sizeof(sin6.sin6_addr));
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inet6_getscopeid(&sin6, INET6_IS_ADDR_LINKLOCAL|
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INET6_IS_ADDR_MC_LINKLOCAL);
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if (getnameinfo((struct sockaddr *)&sin6, sin6.sin6_len,
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buf, sizeof(buf), NULL, 0, niflags) == 0)
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return buf;
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else
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return "(invalid)";
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}
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static bool
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check_inet6_availability(void)
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{
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size_t dummy;
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return sysctlnametomib("net.inet6.multicast", NULL, &dummy) == 0;
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}
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int
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main(void)
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{
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struct if_nameindex *ifps;
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size_t i;
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bool inet6_available = check_inet6_availability();
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ifps = if_nameindex();
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if (ifps == NULL)
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errx(1, "failed to obtain list of interfaces");
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for (i = 0; ifps[i].if_name != NULL; ++i) {
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printf("%s:\n", ifps[i].if_name);
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if (inet6_available)
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print_inet6_mcast(ifps[i].if_index, ifps[i].if_name);
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print_ether_mcast(ifps[i].if_index);
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}
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if_freenameindex(ifps);
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exit(0);
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/*NOTREACHED*/
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}
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static void
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print_hwaddr(const uint8_t *hwaddr, size_t len)
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{
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while (len)
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printf("%02x%s", *hwaddr++, len-- == 0 ? "" : ":");
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}
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static void
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print_ether_mcast(u_short ifindex)
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{
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static int ems_oids[4], sdl_oids[3];
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size_t i, ems_len, sdl_len;
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void *hwaddr;
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struct ether_multi_sysctl *ems;
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if (ems_oids[0] == 0) {
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size_t oidlen = __arraycount(ems_oids);
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if (sysctlnametomib("net.ether.multicast", ems_oids, &oidlen) == -1)
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errx(1, "net.ether.multicast not found");
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if (oidlen != 3)
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errx(1, "Wrong OID path for net.ether.multicast");
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}
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if (sdl_oids[0] == 0) {
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size_t oidlen = __arraycount(sdl_oids);
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if (sysctlnametomib("net.sdl", sdl_oids, &oidlen) == -1)
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errx(1, "net.sdl not found");
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if (oidlen != 2)
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errx(1, "Wrong OID path for net.sdl");
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}
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sdl_oids[2] = ifindex;
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hwaddr = asysctl(sdl_oids, 3, &sdl_len);
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if (sdl_len == 0) {
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free(hwaddr);
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return;
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}
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if (hwaddr == NULL) {
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warn("failed to read net.sdl");
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}
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ems_oids[3] = ifindex;
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ems = asysctl(ems_oids, 4, &ems_len);
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ems_len /= sizeof(*ems);
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if (ems == NULL && ems_len != 0) {
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warn("failed to read net.ether.multicast");
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return;
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}
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printf("\tenaddr ");
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print_hwaddr(hwaddr, sdl_len);
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printf(" multicnt %zu\n", ems_len);
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for (i = 0; i < ems_len; ++i) {
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printf("\t\t");
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print_hwaddr(ems[i].enm_addrlo, sizeof(ems[i].enm_addrlo));
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printf(" -- ");
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print_hwaddr(ems[i].enm_addrhi, sizeof(ems[i].enm_addrhi));
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printf(" %d\n", ems[i].enm_refcount);
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}
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free(ems);
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free(hwaddr);
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}
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static void
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print_inet6_mcast(u_short ifindex, const char *ifname)
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{
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static int mcast_oids[4];
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const char *addr;
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uint8_t *mcast_addrs, *p, *last_p;
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uint32_t refcnt;
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size_t len;
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if (mcast_oids[0] == 0) {
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size_t oidlen = __arraycount(mcast_oids);
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if (sysctlnametomib("net.inet6.multicast", mcast_oids,
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&oidlen) == -1)
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errx(1, "net.inet6.multicast not found");
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if (oidlen != 3)
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errx(1, "Wrong OID path for net.inet6.multicast");
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}
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mcast_oids[3] = ifindex;
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mcast_addrs = asysctl(mcast_oids, 4, &len);
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if (mcast_addrs == NULL && len != 0) {
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warn("failed to read net.inet6.multicast");
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return;
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}
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if (len) {
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p = mcast_addrs;
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last_p = NULL;
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while (len >= 2 * sizeof(struct in6_addr) + sizeof(uint32_t)) {
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if (last_p == NULL ||
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memcmp(p, last_p, sizeof(struct in6_addr)))
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printf("\tinet6 %s\n", inet6_n2a(p));
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last_p = p;
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p += sizeof(struct in6_addr);
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addr = inet6_n2a(p);
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p += sizeof(struct in6_addr);
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memcpy(&refcnt, p, sizeof(refcnt));
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p += sizeof(refcnt);
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printf("\t\tgroup %s refcount %" PRIu32 "\n", addr,
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refcnt);
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len -= 2 * sizeof(struct in6_addr) + sizeof(uint32_t);
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}
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}
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free(mcast_addrs);
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}
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