blob: 133367a2388d6f561d1a8eb100bf23f54c80c7e5 [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 <inttypes.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 <rt_names.h>
#include "utils.h"
#include "ip_common.h"
static void usage(void) __attribute__((noreturn));
static void usage(void)
{
fprintf(stderr, "Usage: ip mroute show [ [ to ] PREFIX ] [ from PREFIX ] [ iif DEVICE ]\n");
fprintf(stderr, " [ table TABLE_ID ]\n");
fprintf(stderr, "TABLE_ID := [ local | main | default | all | NUMBER ]\n");
#if 0
fprintf(stderr, "Usage: ip mroute [ add | del ] DESTINATION from SOURCE [ iif DEVICE ] [ oif DEVICE ]\n");
#endif
exit(-1);
}
struct rtfilter {
int tb;
int af;
int iif;
inet_prefix mdst;
inet_prefix msrc;
} filter;
int print_mroute(const struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
{
FILE *fp = (FILE *)arg;
struct rtmsg *r = NLMSG_DATA(n);
int len = n->nlmsg_len;
struct rtattr *tb[RTA_MAX+1];
char obuf[256];
SPRINT_BUF(b1);
__u32 table;
int iif = 0;
int family;
if ((n->nlmsg_type != RTM_NEWROUTE &&
n->nlmsg_type != RTM_DELROUTE)) {
fprintf(stderr, "Not a multicast route: %08x %08x %08x\n",
n->nlmsg_len, n->nlmsg_type, n->nlmsg_flags);
return 0;
}
len -= NLMSG_LENGTH(sizeof(*r));
if (len < 0) {
fprintf(stderr, "BUG: wrong nlmsg len %d\n", len);
return -1;
}
if (r->rtm_type != RTN_MULTICAST) {
fprintf(stderr, "Not a multicast route (type: %s)\n",
rtnl_rtntype_n2a(r->rtm_type, b1, sizeof(b1)));
return 0;
}
parse_rtattr(tb, RTA_MAX, RTM_RTA(r), len);
table = rtm_get_table(r, tb);
if (filter.tb > 0 && filter.tb != table)
return 0;
if (tb[RTA_IIF])
iif = *(int *)RTA_DATA(tb[RTA_IIF]);
if (filter.iif && filter.iif != iif)
return 0;
if (filter.af && filter.af != r->rtm_family)
return 0;
if (tb[RTA_DST] && filter.mdst.bitlen > 0) {
inet_prefix dst = { .family = r->rtm_family };
memcpy(&dst.data, RTA_DATA(tb[RTA_DST]), RTA_PAYLOAD(tb[RTA_DST]));
if (inet_addr_match(&dst, &filter.mdst, filter.mdst.bitlen))
return 0;
}
if (tb[RTA_SRC] && filter.msrc.bitlen > 0) {
inet_prefix src = { .family = r->rtm_family };
memcpy(&src.data, RTA_DATA(tb[RTA_SRC]), RTA_PAYLOAD(tb[RTA_SRC]));
if (inet_addr_match(&src, &filter.msrc, filter.msrc.bitlen))
return 0;
}
family = get_real_family(r->rtm_type, r->rtm_family);
if (n->nlmsg_type == RTM_DELROUTE)
fprintf(fp, "Deleted ");
if (tb[RTA_SRC])
len = snprintf(obuf, sizeof(obuf),
"(%s, ", rt_addr_n2a_rta(family, tb[RTA_SRC]));
else
len = sprintf(obuf, "(unknown, ");
if (tb[RTA_DST])
snprintf(obuf + len, sizeof(obuf) - len,
"%s)", rt_addr_n2a_rta(family, tb[RTA_DST]));
else
snprintf(obuf + len, sizeof(obuf) - len, "unknown) ");
fprintf(fp, "%-32s Iif: ", obuf);
if (iif)
fprintf(fp, "%-10s ", ll_index_to_name(iif));
else
fprintf(fp, "unresolved ");
if (tb[RTA_MULTIPATH]) {
struct rtnexthop *nh = RTA_DATA(tb[RTA_MULTIPATH]);
int first = 1;
len = RTA_PAYLOAD(tb[RTA_MULTIPATH]);
for (;;) {
if (len < sizeof(*nh))
break;
if (nh->rtnh_len > len)
break;
if (first) {
fprintf(fp, "Oifs: ");
first = 0;
}
fprintf(fp, "%s", ll_index_to_name(nh->rtnh_ifindex));
if (nh->rtnh_hops > 1)
fprintf(fp, "(ttl %d) ", nh->rtnh_hops);
else
fprintf(fp, " ");
len -= NLMSG_ALIGN(nh->rtnh_len);
nh = RTNH_NEXT(nh);
}
}
if (show_stats && tb[RTA_MFC_STATS]) {
struct rta_mfc_stats *mfcs = RTA_DATA(tb[RTA_MFC_STATS]);
fprintf(fp, "%s %"PRIu64" packets, %"PRIu64" bytes", _SL_,
(uint64_t)mfcs->mfcs_packets,
(uint64_t)mfcs->mfcs_bytes);
if (mfcs->mfcs_wrong_if)
fprintf(fp, ", %"PRIu64" arrived on wrong iif.",
(uint64_t)mfcs->mfcs_wrong_if);
}
fprintf(fp, "\n");
fflush(fp);
return 0;
}
void ipmroute_reset_filter(int ifindex)
{
memset(&filter, 0, sizeof(filter));
filter.mdst.bitlen = -1;
filter.msrc.bitlen = -1;
filter.iif = ifindex;
}
static int mroute_list(int argc, char **argv)
{
char *id = NULL;
int family;
ipmroute_reset_filter(0);
if (preferred_family == AF_UNSPEC)
family = AF_INET;
else
family = AF_INET6;
if (family == AF_INET) {
filter.af = RTNL_FAMILY_IPMR;
filter.tb = RT_TABLE_DEFAULT; /* for backward compatibility */
} else
filter.af = RTNL_FAMILY_IP6MR;
while (argc > 0) {
if (matches(*argv, "table") == 0) {
__u32 tid;
NEXT_ARG();
if (rtnl_rttable_a2n(&tid, *argv)) {
if (strcmp(*argv, "all") == 0) {
filter.tb = 0;
} else if (strcmp(*argv, "help") == 0) {
usage();
} else {
invarg("table id value is invalid\n", *argv);
}
} else
filter.tb = tid;
} else if (strcmp(*argv, "iif") == 0) {
NEXT_ARG();
id = *argv;
} else if (matches(*argv, "from") == 0) {
NEXT_ARG();
get_prefix(&filter.msrc, *argv, family);
} else {
if (strcmp(*argv, "to") == 0) {
NEXT_ARG();
}
if (matches(*argv, "help") == 0)
usage();
get_prefix(&filter.mdst, *argv, family);
}
argc--; argv++;
}
ll_init_map(&rth);
if (id) {
int idx;
if ((idx = ll_name_to_index(id)) == 0) {
fprintf(stderr, "Cannot find device \"%s\"\n", id);
return -1;
}
filter.iif = idx;
}
if (rtnl_wilddump_request(&rth, filter.af, RTM_GETROUTE) < 0) {
perror("Cannot send dump request");
return 1;
}
if (rtnl_dump_filter(&rth, print_mroute, stdout) < 0) {
fprintf(stderr, "Dump terminated\n");
exit(1);
}
exit(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);
}