blob: 977143cc3dfa9495e3277224473fc9d7f45409ec [file] [log] [blame]
/*
* ipmroute.c "ip mroute".
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <syslog.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <string.h>
#include <linux/netdevice.h>
#include <linux/if.h>
#include <linux/if_arp.h>
#include <linux/sockios.h>
#include "utils.h"
char filter_dev[16];
int filter_family;
static void usage(void) __attribute__((noreturn));
static void usage(void)
{
fprintf(stderr, "Usage: ip mroute show [ PREFIX ] [ from PREFIX ] [ iif DEVICE ]\n");
#if 0
fprintf(stderr, "Usage: ip mroute [ add | del ] DESTINATION from SOURCE [ iif DEVICE ] [ oif DEVICE ]\n");
#endif
exit(-1);
}
static char *viftable[32];
struct rtfilter
{
inet_prefix mdst;
inet_prefix msrc;
} filter;
static void read_viftable(void)
{
char buf[256];
FILE *fp = fopen("/proc/net/ip_mr_vif", "r");
if (!fp)
return;
fgets(buf, sizeof(buf), fp);
while (fgets(buf, sizeof(buf), fp)) {
int vifi;
char dev[256];
if (sscanf(buf, "%d%s", &vifi, dev) < 2)
continue;
if (vifi<0 || vifi>31)
continue;
viftable[vifi] = strdup(dev);
}
fclose(fp);
}
static void read_mroute_list(FILE *ofp)
{
char buf[256];
FILE *fp = fopen("/proc/net/ip_mr_cache", "r");
if (!fp)
return;
fgets(buf, sizeof(buf), fp);
while (fgets(buf, sizeof(buf), fp)) {
inet_prefix maddr, msrc;
unsigned pkts, b, w;
int vifi;
char oiflist[256];
char sbuf[256];
char mbuf[256];
char obuf[256];
oiflist[0] = 0;
if (sscanf(buf, "%x%x%d%u%u%u %[^\n]",
maddr.data, msrc.data, &vifi,
&pkts, &b, &w, oiflist) < 6)
continue;
if (vifi!=-1 && (vifi < 0 || vifi>31))
continue;
if (filter_dev[0] && (vifi<0 || strcmp(filter_dev, viftable[vifi])))
continue;
if (filter.mdst.family && inet_addr_match(&maddr, &filter.mdst, filter.mdst.bitlen))
continue;
if (filter.msrc.family && inet_addr_match(&msrc, &filter.msrc, filter.msrc.bitlen))
continue;
snprintf(obuf, sizeof(obuf), "(%s, %s)",
format_host(AF_INET, 4, &msrc.data[0], sbuf, sizeof(sbuf)),
format_host(AF_INET, 4, &maddr.data[0], mbuf, sizeof(mbuf)));
fprintf(ofp, "%-32s Iif: ", obuf);
if (vifi == -1)
fprintf(ofp, "unresolved ");
else
fprintf(ofp, "%-10s ", viftable[vifi]);
if (oiflist[0]) {
char *next = NULL;
char *p = oiflist;
int ovifi, ottl;
fprintf(ofp, "Oifs: ");
while (p) {
next = strchr(p, ' ');
if (next) {
*next = 0;
next++;
}
if (sscanf(p, "%d:%d", &ovifi, &ottl)<2) {
p = next;
continue;
}
p = next;
fprintf(ofp, "%s", viftable[ovifi]);
if (ottl>1)
fprintf(ofp, "(ttl %d) ", ovifi);
else
fprintf(ofp, " ");
}
}
if (show_stats && b) {
fprintf(ofp, "%s %u packets, %u bytes", _SL_, pkts, b);
if (w)
fprintf(ofp, ", %u arrived on wrong iif.", w);
}
fprintf(ofp, "\n");
}
fclose(fp);
}
static int mroute_list(int argc, char **argv)
{
while (argc > 0) {
if (strcmp(*argv, "iif") == 0) {
NEXT_ARG();
strncpy(filter_dev, *argv, sizeof(filter_dev)-1);
} else if (matches(*argv, "from") == 0) {
NEXT_ARG();
get_prefix(&filter.msrc, *argv, AF_INET);
} else {
if (strcmp(*argv, "to") == 0) {
NEXT_ARG();
}
if (matches(*argv, "help") == 0)
usage();
get_prefix(&filter.mdst, *argv, AF_INET);
}
argv++; argc--;
}
read_viftable();
read_mroute_list(stdout);
return 0;
}
int do_multiroute(int argc, char **argv)
{
if (argc < 1)
return mroute_list(0, NULL);
#if 0
if (matches(*argv, "add") == 0)
return mroute_modify(RTM_NEWADDR, argc-1, argv+1);
if (matches(*argv, "delete") == 0)
return mroute_modify(RTM_DELADDR, argc-1, argv+1);
if (matches(*argv, "get") == 0)
return mroute_get(argc-1, argv+1);
#endif
if (matches(*argv, "list") == 0 || matches(*argv, "show") == 0
|| matches(*argv, "lst") == 0)
return mroute_list(argc-1, argv+1);
if (matches(*argv, "help") == 0)
usage();
fprintf(stderr, "Command \"%s\" is unknown, try \"ip mroute help\".\n", *argv);
exit(-1);
}