1/*
2 * ipmroute.c		"ip mroute".
3 *
4 *		This program is free software; you can redistribute it and/or
5 *		modify it under the terms of the GNU General Public License
6 *		as published by the Free Software Foundation; either version
7 *		2 of the License, or (at your option) any later version.
8 *
9 * Authors:	Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
10 *
11 */
12
13#include <stdio.h>
14#include <stdlib.h>
15#include <unistd.h>
16#include <syslog.h>
17#include <fcntl.h>
18#include <sys/ioctl.h>
19#include <sys/socket.h>
20#include <netinet/in.h>
21#include <arpa/inet.h>
22#include <string.h>
23
24#include <linux/netdevice.h>
25#include <linux/if.h>
26#include <linux/if_arp.h>
27#include <linux/sockios.h>
28
29#include "utils.h"
30
31char filter_dev[16];
32int  filter_family;
33
34static void usage(void) __attribute__((noreturn));
35
36static void usage(void)
37{
38	fprintf(stderr, "Usage: ip mroute show [ PREFIX ] [ from PREFIX ] [ iif DEVICE ]\n");
39#if 0
40	fprintf(stderr, "Usage: ip mroute [ add | del ] DESTINATION from SOURCE [ iif DEVICE ] [ oif DEVICE ]\n");
41#endif
42	exit(-1);
43}
44
45static char *viftable[32];
46
47struct rtfilter
48{
49	inet_prefix mdst;
50	inet_prefix msrc;
51} filter;
52
53static void read_viftable(void)
54{
55	char buf[256];
56	FILE *fp = fopen("/proc/net/ip_mr_vif", "r");
57
58	if (!fp)
59		return;
60
61	fgets(buf, sizeof(buf), fp);
62
63	while (fgets(buf, sizeof(buf), fp)) {
64		int vifi;
65		char dev[256];
66
67		if (sscanf(buf, "%d%s", &vifi, dev) < 2)
68			continue;
69
70		if (vifi<0 || vifi>31)
71			continue;
72
73		viftable[vifi] = strdup(dev);
74	}
75	fclose(fp);
76}
77
78static void read_mroute_list(FILE *ofp)
79{
80	char buf[256];
81	FILE *fp = fopen("/proc/net/ip_mr_cache", "r");
82
83	if (!fp)
84		return;
85
86	fgets(buf, sizeof(buf), fp);
87
88	while (fgets(buf, sizeof(buf), fp)) {
89		inet_prefix maddr, msrc;
90		unsigned pkts, b, w;
91		int vifi;
92		char oiflist[256];
93		char sbuf[256];
94		char mbuf[256];
95		char obuf[256];
96
97		oiflist[0] = 0;
98		if (sscanf(buf, "%x%x%d%u%u%u %[^\n]",
99			   maddr.data, msrc.data, &vifi,
100			   &pkts, &b, &w, oiflist) < 6)
101			continue;
102
103		if (vifi!=-1 && (vifi < 0 || vifi>31))
104			continue;
105
106		if (filter_dev[0] && (vifi<0 || strcmp(filter_dev, viftable[vifi])))
107			continue;
108		if (filter.mdst.family && inet_addr_match(&maddr, &filter.mdst, filter.mdst.bitlen))
109			continue;
110		if (filter.msrc.family && inet_addr_match(&msrc, &filter.msrc, filter.msrc.bitlen))
111			continue;
112
113		snprintf(obuf, sizeof(obuf), "(%s, %s)",
114			 format_host(AF_INET, 4, &msrc.data[0], sbuf, sizeof(sbuf)),
115			 format_host(AF_INET, 4, &maddr.data[0], mbuf, sizeof(mbuf)));
116
117		fprintf(ofp, "%-32s Iif: ", obuf);
118
119		if (vifi == -1)
120			fprintf(ofp, "unresolved ");
121		else
122			fprintf(ofp, "%-10s ", viftable[vifi]);
123
124		if (oiflist[0]) {
125			char *next = NULL;
126			char *p = oiflist;
127			int ovifi, ottl;
128
129			fprintf(ofp, "Oifs: ");
130
131			while (p) {
132				next = strchr(p, ' ');
133				if (next) {
134					*next = 0;
135					next++;
136				}
137				if (sscanf(p, "%d:%d", &ovifi, &ottl)<2) {
138					p = next;
139					continue;
140				}
141				p = next;
142
143				fprintf(ofp, "%s", viftable[ovifi]);
144				if (ottl>1)
145					fprintf(ofp, "(ttl %d) ", ovifi);
146				else
147					fprintf(ofp, " ");
148			}
149		}
150
151		if (show_stats && b) {
152			fprintf(ofp, "%s  %u packets, %u bytes", _SL_, pkts, b);
153			if (w)
154				fprintf(ofp, ", %u arrived on wrong iif.", w);
155		}
156		fprintf(ofp, "\n");
157	}
158	fclose(fp);
159}
160
161
162static int mroute_list(int argc, char **argv)
163{
164	while (argc > 0) {
165		if (strcmp(*argv, "iif") == 0) {
166			NEXT_ARG();
167			strncpy(filter_dev, *argv, sizeof(filter_dev)-1);
168		} else if (matches(*argv, "from") == 0) {
169			NEXT_ARG();
170			get_prefix(&filter.msrc, *argv, AF_INET);
171		} else {
172			if (strcmp(*argv, "to") == 0) {
173				NEXT_ARG();
174			}
175			if (matches(*argv, "help") == 0)
176				usage();
177			get_prefix(&filter.mdst, *argv, AF_INET);
178		}
179		argv++; argc--;
180	}
181
182	read_viftable();
183	read_mroute_list(stdout);
184	return 0;
185}
186
187int do_multiroute(int argc, char **argv)
188{
189	if (argc < 1)
190		return mroute_list(0, NULL);
191#if 0
192	if (matches(*argv, "add") == 0)
193		return mroute_modify(RTM_NEWADDR, argc-1, argv+1);
194	if (matches(*argv, "delete") == 0)
195		return mroute_modify(RTM_DELADDR, argc-1, argv+1);
196	if (matches(*argv, "get") == 0)
197		return mroute_get(argc-1, argv+1);
198#endif
199	if (matches(*argv, "list") == 0 || matches(*argv, "show") == 0
200	    || matches(*argv, "lst") == 0)
201		return mroute_list(argc-1, argv+1);
202	if (matches(*argv, "help") == 0)
203		usage();
204	fprintf(stderr, "Command \"%s\" is unknown, try \"ip mroute help\".\n", *argv);
205	exit(-1);
206}
207