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ifmcstat: remove libkvm(3) code

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It has been broken and disabled for over 10 years.  Remove mentions of the
kvm(3) from the manual page.
This commit is contained in:
Gleb Smirnoff committed 2026-03-18 14:00:43 -07:00
1 parent cc6672235c
commit ad0e698e64
2 files changed
+3 -544
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usr.sbin/ifmcstat/ifmcstat.8
+1 -44
View File
@@ -28,7 +28,7 @@
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.Dd May 27, 2009
.Dd March 18, 2026
.Dt IFMCSTAT 8
.Os
.Sh NAME
@@ -65,30 +65,6 @@ they are suppressed by default.
It may not be specified for
.Fl f Ar link .
Source lists for each group will also be printed.
.Pp
If specified twice, and
.Xr kvm 3
is in use, the control plane timers for each interface
and the source list counters for each group
will also be printed.
.El
.Pp
The following options are only available if
.Nm
has been built with support for
.Xr kvm 3 :
.Bl -tag -width Fl
.It Fl K
attempts to use
.Xr kvm 3
to retrieve the multicast group information.
.It Fl M Ar core
extracts values associated with the name list from the specified core,
instead of the default
.Pa /dev/kmem .
.It Fl N Ar system
extracts the name list from the specified kernel instead of the
default, which is the kernel image the system has booted from.
.El
.Sh IMPLEMENTATION NOTES
.Nm
@@ -102,26 +78,7 @@ option,
.Nm
may print multicast MAC addresses twice if they are
referenced by a layer 3 protocol.
.Pp
When run with
.Xr kvm 3
support,
the names of all interfaces configured in the system will be
printed in the first column of output, even if no multicast
group memberships are present on those interfaces.
The output may also be slightly different, as the kernel
data structures are being traversed with minimal post-processing
of the output.
.Pp
When built without
.Xr kvm 3
support, the information displayed by
.Nm
is more limited.
This support is recommended for debugging purposes.
It requires super-user privilege if used to inspect a running kernel.
.Sh SEE ALSO
.Xr netstat 1 ,
.Xr getifaddrs 3 ,
.Xr getifmaddrs 3 ,
.Xr kvm 3
usr.sbin/ifmcstat/ifmcstat.c
+2 -500
View File
@@ -76,17 +76,6 @@
#include <sysexits.h>
#include <unistd.h>
#ifdef KVM
/*
* Currently the KVM build is broken. To be fixed it requires uncovering
* large amount of _KERNEL code in include files, and it is also very
* tentative to internal kernel ABI changes. If anyone wishes to restore
* it, please move it out of src/usr.sbin to src/tools/tools.
*/
#include <kvm.h>
#include <nlist.h>
#endif
/* XXX: This file currently assumes INET support in the base system. */
#ifndef INET
#define INET
@@ -109,9 +98,6 @@ typedef union sockunion sockunion_t;
uint32_t ifindex = 0;
int af = AF_UNSPEC;
#ifdef WITH_KVM
int Kflag = 0;
#endif
int vflag = 0;
#define sa_dl_equal(a1, a2) \
@@ -121,41 +107,6 @@ int vflag = 0;
LLADDR((struct sockaddr_dl *)(a2)), \
((struct sockaddr_dl *)(a1))->sdl_alen) == 0))
/*
* Most of the code in this utility is to support the use of KVM for
* post-mortem debugging of the multicast code.
*/
#ifdef WITH_KVM
#ifdef INET
static void if_addrlist(struct ifaddr *);
static struct in_multi *
in_multientry(struct in_multi *);
#endif /* INET */
#ifdef INET6
static void if6_addrlist(struct ifaddr *);
static struct in6_multi *
in6_multientry(struct in6_multi *);
#endif /* INET6 */
static void kread(u_long, void *, int);
static void ll_addrlist(struct ifaddr *);
static int ifmcstat_kvm(const char *kernel, const char *core);
#define KREAD(addr, buf, type) \
kread((u_long)addr, (void *)buf, sizeof(type))
kvm_t *kvmd;
struct nlist nl[] = {
{ "_ifnet", 0, 0, 0, 0, },
{ "", 0, 0, 0, 0, },
};
#define N_IFNET 0
#endif /* WITH_KVM */
static int ifmcstat_getifmaddrs(void);
#ifdef INET
static void in_ifinfo(struct igmp_ifinfo *);
@@ -172,29 +123,16 @@ usage()
{
fprintf(stderr,
"usage: ifmcstat [-i interface] [-f address family]"
" [-v]"
#ifdef WITH_KVM
" [-K] [-M core] [-N system]"
#endif
"\n");
"usage: ifmcstat [-i interface] [-f address family] [-v]\n");
exit(EX_USAGE);
}
static const char *options = "i:f:vM:N:"
#ifdef WITH_KVM
"K"
#endif
;
static const char *options = "i:f:vM:N:";
int
main(int argc, char **argv)
{
int c, error;
#ifdef WITH_KVM
const char *kernel = NULL;
const char *core = NULL;
#endif
while ((c = getopt(argc, argv, options)) != -1) {
switch (c) {
@@ -228,26 +166,10 @@ main(int argc, char **argv)
/*NOTREACHED*/
break;
#ifdef WITH_KVM
case 'K':
++Kflag;
break;
#endif
case 'v':
++vflag;
break;
#ifdef WITH_KVM
case 'M':
core = strdup(optarg);
break;
case 'N':
kernel = strdup(optarg);
break;
#endif
default:
usage();
break;
@@ -258,15 +180,6 @@ main(int argc, char **argv)
if (af == AF_LINK && vflag)
usage();
#ifdef WITH_KVM
if (Kflag)
error = ifmcstat_kvm(kernel, core);
/*
* If KVM failed, and user did not explicitly specify a core file,
* or force KVM backend to be disabled, try the sysctl backend.
*/
if (!Kflag || (error != 0 && (core == NULL && kernel == NULL)))
#endif
error = ifmcstat_getifmaddrs();
if (error != 0)
exit(EX_OSERR);
@@ -322,417 +235,6 @@ inm_mode(u_int mode)
#endif /* INET */
#ifdef WITH_KVM
static int
ifmcstat_kvm(const char *kernel, const char *core)
{
char buf[_POSIX2_LINE_MAX], ifname[IFNAMSIZ];
struct ifnet *ifp, *nifp, ifnet;
if ((kvmd = kvm_openfiles(kernel, core, NULL, O_RDONLY, buf)) ==
NULL) {
perror("kvm_openfiles");
return (-1);
}
if (kvm_nlist(kvmd, nl) < 0) {
perror("kvm_nlist");
return (-1);
}
if (nl[N_IFNET].n_value == 0) {
printf("symbol %s not found\n", nl[N_IFNET].n_name);
return (-1);
}
KREAD(nl[N_IFNET].n_value, &ifp, struct ifnet *);
while (ifp) {
KREAD(ifp, &ifnet, struct ifnet);
nifp = ifnet.if_link.tqe_next;
if (ifindex && ifindex != ifnet.if_index)
goto next;
printf("%s:\n", if_indextoname(ifnet.if_index, ifname));
#ifdef INET
if_addrlist(TAILQ_FIRST(&ifnet.if_addrhead));
#endif
#ifdef INET6
if6_addrlist(TAILQ_FIRST(&ifnet.if_addrhead));
#endif
if (vflag)
ll_addrlist(TAILQ_FIRST(&ifnet.if_addrhead));
next:
ifp = nifp;
}
return (0);
}
static void
kread(u_long addr, void *buf, int len)
{
if (kvm_read(kvmd, addr, buf, len) != len) {
perror("kvm_read");
exit(EX_OSERR);
}
}
static void
ll_addrlist(struct ifaddr *ifap)
{
char addrbuf[NI_MAXHOST];
struct ifaddr ifa;
struct sockaddr sa;
struct sockaddr_dl sdl;
struct ifaddr *ifap0;
if (af && af != AF_LINK)
return;
ifap0 = ifap;
while (ifap) {
KREAD(ifap, &ifa, struct ifaddr);
if (ifa.ifa_addr == NULL)
goto nextifap;
KREAD(ifa.ifa_addr, &sa, struct sockaddr);
if (sa.sa_family != PF_LINK)
goto nextifap;
KREAD(ifa.ifa_addr, &sdl, struct sockaddr_dl);
if (sdl.sdl_alen == 0)
goto nextifap;
addrbuf[0] = '\0';
getnameinfo((struct sockaddr *)&sdl, sdl.sdl_len,
addrbuf, sizeof(addrbuf), NULL, 0, NI_NUMERICHOST);
printf("\tlink %s\n", addrbuf);
nextifap:
ifap = ifa.ifa_link.tqe_next;
}
if (ifap0) {
struct ifnet ifnet;
struct ifmultiaddr ifm, *ifmp = 0;
KREAD(ifap0, &ifa, struct ifaddr);
KREAD(ifa.ifa_ifp, &ifnet, struct ifnet);
if (TAILQ_FIRST(&ifnet.if_multiaddrs))
ifmp = TAILQ_FIRST(&ifnet.if_multiaddrs);
while (ifmp) {
KREAD(ifmp, &ifm, struct ifmultiaddr);
if (ifm.ifma_addr == NULL)
goto nextmulti;
KREAD(ifm.ifma_addr, &sa, struct sockaddr);
if (sa.sa_family != AF_LINK)
goto nextmulti;
KREAD(ifm.ifma_addr, &sdl, struct sockaddr_dl);
addrbuf[0] = '\0';
getnameinfo((struct sockaddr *)&sdl,
sdl.sdl_len, addrbuf, sizeof(addrbuf),
NULL, 0, NI_NUMERICHOST);
printf("\t\tgroup %s refcnt %d\n",
addrbuf, ifm.ifma_refcount);
nextmulti:
ifmp = TAILQ_NEXT(&ifm, ifma_link);
}
}
}
#ifdef INET6
static void
if6_addrlist(struct ifaddr *ifap)
{
struct ifnet ifnet;
struct ifaddr ifa;
struct sockaddr sa;
struct in6_ifaddr if6a;
struct ifaddr *ifap0;
if (af && af != AF_INET6)
return;
ifap0 = ifap;
while (ifap) {
KREAD(ifap, &ifa, struct ifaddr);
if (ifa.ifa_addr == NULL)
goto nextifap;
KREAD(ifa.ifa_addr, &sa, struct sockaddr);
if (sa.sa_family != PF_INET6)
goto nextifap;
KREAD(ifap, &if6a, struct in6_ifaddr);
printf("\tinet6 %s\n", inet6_n2a(&if6a.ia_addr.sin6_addr,
if6a.ia_addr.sin6_scope_id));
/*
* Print per-link MLD information, if available.
*/
if (ifa.ifa_ifp != NULL) {
struct in6_ifextra ie;
struct mld_ifinfo mli;
KREAD(ifa.ifa_ifp, &ifnet, struct ifnet);
KREAD(ifnet.if_afdata[AF_INET6], &ie,
struct in6_ifextra);
if (ie.mld_ifinfo != NULL) {
KREAD(ie.mld_ifinfo, &mli, struct mld_ifinfo);
in6_ifinfo(&mli);
}
}
nextifap:
ifap = ifa.ifa_link.tqe_next;
}
if (ifap0) {
struct ifnet ifnet;
struct ifmultiaddr ifm, *ifmp = 0;
struct sockaddr_dl sdl;
KREAD(ifap0, &ifa, struct ifaddr);
KREAD(ifa.ifa_ifp, &ifnet, struct ifnet);
if (TAILQ_FIRST(&ifnet.if_multiaddrs))
ifmp = TAILQ_FIRST(&ifnet.if_multiaddrs);
while (ifmp) {
KREAD(ifmp, &ifm, struct ifmultiaddr);
if (ifm.ifma_addr == NULL)
goto nextmulti;
KREAD(ifm.ifma_addr, &sa, struct sockaddr);
if (sa.sa_family != AF_INET6)
goto nextmulti;
(void)in6_multientry((struct in6_multi *)
ifm.ifma_protospec);
if (ifm.ifma_lladdr == 0)
goto nextmulti;
KREAD(ifm.ifma_lladdr, &sdl, struct sockaddr_dl);
printf("\t\t\tmcast-macaddr %s refcnt %d\n",
ether_ntoa((struct ether_addr *)LLADDR(&sdl)),
ifm.ifma_refcount);
nextmulti:
ifmp = TAILQ_NEXT(&ifm, ifma_link);
}
}
}
static struct in6_multi *
in6_multientry(struct in6_multi *mc)
{
struct in6_multi multi;
KREAD(mc, &multi, struct in6_multi);
printf("\t\tgroup %s", inet6_n2a(&multi.in6m_addr, 0));
printf(" refcnt %u\n", multi.in6m_refcount);
return (multi.in6m_entry.le_next);
}
#endif /* INET6 */
#ifdef INET
static void
if_addrlist(struct ifaddr *ifap)
{
struct ifaddr ifa;
struct ifnet ifnet;
struct sockaddr sa;
struct in_ifaddr ia;
struct ifaddr *ifap0;
if (af && af != AF_INET)
return;
ifap0 = ifap;
while (ifap) {
KREAD(ifap, &ifa, struct ifaddr);
if (ifa.ifa_addr == NULL)
goto nextifap;
KREAD(ifa.ifa_addr, &sa, struct sockaddr);
if (sa.sa_family != PF_INET)
goto nextifap;
KREAD(ifap, &ia, struct in_ifaddr);
printf("\tinet %s\n", inet_ntoa(ia.ia_addr.sin_addr));
/*
* Print per-link IGMP information, if available.
*/
if (ifa.ifa_ifp != NULL) {
struct in_ifinfo ii;
struct igmp_ifinfo igi;
KREAD(ifa.ifa_ifp, &ifnet, struct ifnet);
KREAD(ifnet.if_afdata[AF_INET], &ii, struct in_ifinfo);
if (ii.ii_igmp != NULL) {
KREAD(ii.ii_igmp, &igi, struct igmp_ifinfo);
in_ifinfo(&igi);
}
}
nextifap:
ifap = ifa.ifa_link.tqe_next;
}
if (ifap0) {
struct ifmultiaddr ifm, *ifmp = 0;
struct sockaddr_dl sdl;
KREAD(ifap0, &ifa, struct ifaddr);
KREAD(ifa.ifa_ifp, &ifnet, struct ifnet);
if (TAILQ_FIRST(&ifnet.if_multiaddrs))
ifmp = TAILQ_FIRST(&ifnet.if_multiaddrs);
while (ifmp) {
KREAD(ifmp, &ifm, struct ifmultiaddr);
if (ifm.ifma_addr == NULL)
goto nextmulti;
KREAD(ifm.ifma_addr, &sa, struct sockaddr);
if (sa.sa_family != AF_INET)
goto nextmulti;
(void)in_multientry((struct in_multi *)
ifm.ifma_protospec);
if (ifm.ifma_lladdr == 0)
goto nextmulti;
KREAD(ifm.ifma_lladdr, &sdl, struct sockaddr_dl);
printf("\t\t\tmcast-macaddr %s refcnt %d\n",
ether_ntoa((struct ether_addr *)LLADDR(&sdl)),
ifm.ifma_refcount);
nextmulti:
ifmp = TAILQ_NEXT(&ifm, ifma_link);
}
}
}
static const char *inm_states[] = {
"not-member",
"silent",
"idle",
"lazy",
"sleeping",
"awakening",
"query-pending",
"sg-query-pending",
"leaving"
};
static const char *
inm_state(u_int state)
{
if (state >= IGMP_NOT_MEMBER && state <= IGMP_LEAVING_MEMBER)
return (inm_states[state]);
return (NULL);
}
#if 0
static struct ip_msource *
ims_min_kvm(struct in_multi *pinm)
{
struct ip_msource ims0;
struct ip_msource *tmp, *parent;
parent = NULL;
tmp = RB_ROOT(&pinm->inm_srcs);
while (tmp) {
parent = tmp;
KREAD(tmp, &ims0, struct ip_msource);
tmp = RB_LEFT(&ims0, ims_link);
}
return (parent); /* kva */
}
/* XXX This routine is buggy. See RB_NEXT in sys/tree.h. */
static struct ip_msource *
ims_next_kvm(struct ip_msource *ims)
{
struct ip_msource ims0, ims1;
struct ip_msource *tmp;
KREAD(ims, &ims0, struct ip_msource);
if (RB_RIGHT(&ims0, ims_link)) {
ims = RB_RIGHT(&ims0, ims_link);
KREAD(ims, &ims1, struct ip_msource);
while ((tmp = RB_LEFT(&ims1, ims_link))) {
KREAD(tmp, &ims0, struct ip_msource);
ims = RB_LEFT(&ims0, ims_link);
}
} else {
tmp = RB_PARENT(&ims0, ims_link);
if (tmp) {
KREAD(tmp, &ims1, struct ip_msource);
if (ims == RB_LEFT(&ims1, ims_link))
ims = tmp;
} else {
while ((tmp = RB_PARENT(&ims0, ims_link))) {
KREAD(tmp, &ims1, struct ip_msource);
if (ims == RB_RIGHT(&ims1, ims_link)) {
ims = tmp;
KREAD(ims, &ims0, struct ip_msource);
} else
break;
}
ims = RB_PARENT(&ims0, ims_link);
}
}
return (ims); /* kva */
}
static void
inm_print_sources_kvm(struct in_multi *pinm)
{
struct ip_msource ims0;
struct ip_msource *ims;
struct in_addr src;
int cnt;
uint8_t fmode;
cnt = 0;
fmode = pinm->inm_st[1].iss_fmode;
if (fmode == MCAST_UNDEFINED)
return;
for (ims = ims_min_kvm(pinm); ims != NULL; ims = ims_next_kvm(ims)) {
if (cnt == 0)
printf(" srcs ");
KREAD(ims, &ims0, struct ip_msource);
/* Only print sources in-mode at t1. */
if (fmode != ims_get_mode(pinm, ims, 1))
continue;
src.s_addr = htonl(ims0.ims_haddr);
printf("%s%s", (cnt++ == 0 ? "" : ","), inet_ntoa(src));
}
}
#endif
static struct in_multi *
in_multientry(struct in_multi *pinm)
{
struct in_multi inm;
const char *state, *mode;
KREAD(pinm, &inm, struct in_multi);
printf("\t\tgroup %s", inet_ntoa(inm.inm_addr));
printf(" refcnt %u", inm.inm_refcount);
state = inm_state(inm.inm_state);
if (state)
printf(" state %s", state);
else
printf(" state (%d)", inm.inm_state);
mode = inm_mode(inm.inm_st[1].iss_fmode);
if (mode)
printf(" mode %s", mode);
else
printf(" mode (%d)", inm.inm_st[1].iss_fmode);
if (vflag >= 2) {
printf(" asm %u ex %u in %u rec %u",
(u_int)inm.inm_st[1].iss_asm,
(u_int)inm.inm_st[1].iss_ex,
(u_int)inm.inm_st[1].iss_in,
(u_int)inm.inm_st[1].iss_rec);
}
#if 0
/* Buggy. */
if (vflag)
inm_print_sources_kvm(&inm);
#endif
printf("\n");
return (NULL);
}
#endif /* INET */
#endif /* WITH_KVM */
#ifdef INET6
static void