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ip: add support of netconf messages

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Example of the output:
$ ip monitor netconf&
[1] 24901
$ echo 0 > /proc/sys/net/ipv6/conf/all/forwarding
ipv6 dev lo forwarding off
ipv6 dev eth0 forwarding off
ipv6 all forwarding off
$ echo 1 > /proc/sys/net/ipv4/conf/eth0/forwarding
ipv4 dev eth0 forwarding on

$ ip -6 netconf
ipv6 all forwarding on mc_forwarding 0
$ ip netconf show dev eth0
ipv4 dev eth0 forwarding on rp_filter off mc_forwarding 1

Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>

Minor cleanup of original patch, made sure netconf.h matched
result of santized kernel headers
This commit is contained in:
Nicolas Dichtel 2012-12-12 09:05:51 -08:00 committed by Stephen Hemminger
parent caadda9308
commit 4852ba750a
2 changed files with 207 additions and 0 deletions
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24
include/linux/netconf.h Normal file
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@ -0,0 +1,24 @@
#ifndef _LINUX_NETCONF_H_
#define _LINUX_NETCONF_H_
#include <linux/types.h>
#include <linux/netlink.h>
struct netconfmsg {
__u8 ncm_family;
};
enum {
NETCONFA_UNSPEC,
NETCONFA_IFINDEX,
NETCONFA_FORWARDING,
NETCONFA_RP_FILTER,
NETCONFA_MC_FORWARDING,
__NETCONFA_MAX
};
#define NETCONFA_MAX (__NETCONFA_MAX - 1)
#define NETCONFA_IFINDEX_ALL -1
#define NETCONFA_IFINDEX_DEFAULT -2
#endif /* _LINUX_NETCONF_H_ */

183
ip/ipnetconf.c Normal file
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/*
* ipnetconf.c "ip netconf".
*
* 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: Nicolas Dichtel, <nicolas.dichtel@6wind.com>
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <syslog.h>
#include <fcntl.h>
#include <string.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include "rt_names.h"
#include "utils.h"
#include "ip_common.h"
static struct
{
int family;
int ifindex;
} filter;
static void usage(void) __attribute__((noreturn));
static void usage(void)
{
fprintf(stderr, "Usage: ip netconf show [ dev STRING ]\n");
exit(-1);
}
#define NETCONF_RTA(r) ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct netconfmsg))))
int print_netconf(const struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
{
FILE *fp = (FILE*)arg;
struct netconfmsg *ncm = NLMSG_DATA(n);
int len = n->nlmsg_len;
struct rtattr *tb[NETCONFA_MAX+1];
if (n->nlmsg_type == NLMSG_ERROR)
return -1;
if (n->nlmsg_type != RTM_NEWNETCONF) {
fprintf(stderr, "Not RTM_NEWNETCONF: %08x %08x %08x\n",
n->nlmsg_len, n->nlmsg_type, n->nlmsg_flags);
return -1;
}
len -= NLMSG_SPACE(sizeof(*ncm));
if (len < 0) {
fprintf(stderr, "BUG: wrong nlmsg len %d\n", len);
return -1;
}
if (filter.family && filter.family != ncm->ncm_family)
return 0;
parse_rtattr(tb, NETCONFA_MAX, NETCONF_RTA(ncm),
NLMSG_PAYLOAD(n, sizeof(*ncm)));
switch (ncm->ncm_family) {
case AF_INET:
fprintf(fp, "ipv4 ");
break;
case AF_INET6:
fprintf(fp, "ipv6 ");
break;
default:
fprintf(fp, "unknown ");
break;
}
if (tb[NETCONFA_IFINDEX]) {
int *ifindex = (int *)RTA_DATA(tb[NETCONFA_IFINDEX]);
switch (*ifindex) {
case NETCONFA_IFINDEX_ALL:
fprintf(fp, "all ");
break;
case NETCONFA_IFINDEX_DEFAULT:
fprintf(fp, "default ");
break;
default:
fprintf(fp, "dev %s ", ll_index_to_name(*ifindex));
break;
}
}
if (tb[NETCONFA_FORWARDING])
fprintf(fp, "forwarding %s ",
*(int *)RTA_DATA(tb[NETCONFA_FORWARDING])?"on":"off");
if (tb[NETCONFA_RP_FILTER]) {
int rp_filter = *(int *)RTA_DATA(tb[NETCONFA_RP_FILTER]);
if (rp_filter == 0)
fprintf(fp, "rp_filter off ");
else if (rp_filter == 1)
fprintf(fp, "rp_filter strict ");
else if (rp_filter == 2)
fprintf(fp, "rp_filter loose ");
else
fprintf(fp, "rp_filter unknown mode ");
}
if (tb[NETCONFA_MC_FORWARDING])
fprintf(fp, "mc_forwarding %d ",
*(int *)RTA_DATA(tb[NETCONFA_MC_FORWARDING]));
fprintf(fp, "\n");
fflush(fp);
return 0;
}
void ipnetconf_reset_filter(void)
{
memset(&filter, 0, sizeof(filter));
}
int do_show(int argc, char **argv)
{
struct {
struct nlmsghdr n;
struct netconfmsg ncm;
char buf[1024];
} req;
ipnetconf_reset_filter();
filter.family = preferred_family;
if (filter.family == AF_UNSPEC)
filter.family = AF_INET;
filter.ifindex = NETCONFA_IFINDEX_ALL;
while (argc > 0) {
if (strcmp(*argv, "dev") == 0) {
NEXT_ARG();
filter.ifindex = ll_name_to_index(*argv);
if (filter.ifindex <= 0) {
fprintf(stderr, "Device \"%s\" does not exist.\n",
*argv);
return -1;
}
}
argv++; argc--;
}
ll_init_map(&rth);
memset(&req, 0, sizeof(req));
req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct netconfmsg));
req.n.nlmsg_flags = NLM_F_REQUEST|NLM_F_ACK;
req.n.nlmsg_type = RTM_GETNETCONF;
req.ncm.ncm_family = filter.family;
addattr_l(&req.n, sizeof(req), NETCONFA_IFINDEX, &filter.ifindex,
sizeof(filter.ifindex));
rtnl_send(&rth, &req.n, req.n.nlmsg_len);
rtnl_listen(&rth, print_netconf, stdout);
return 0;
}
int do_ipnetconf(int argc, char **argv)
{
if (argc > 0) {
if (matches(*argv, "show") == 0 ||
matches(*argv, "lst") == 0 ||
matches(*argv, "list") == 0)
return do_show(argc-1, argv+1);
if (matches(*argv, "help") == 0)
usage();
} else
return do_show(0, NULL);
fprintf(stderr, "Command \"%s\" is unknown, try \"ip netconf help\".\n", *argv);
exit(-1);
}