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 (at) 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 31 char filter_dev[16]; 32 int filter_family; 33 34 static void usage(void) __attribute__((noreturn)); 35 36 static 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 45 static char *viftable[32]; 46 47 struct rtfilter 48 { 49 inet_prefix mdst; 50 inet_prefix msrc; 51 } filter; 52 53 static 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 if (!fgets(buf, sizeof(buf), fp)) { 62 fclose(fp); 63 return; 64 } 65 while (fgets(buf, sizeof(buf), fp)) { 66 int vifi; 67 char dev[256]; 68 69 if (sscanf(buf, "%d%s", &vifi, dev) < 2) 70 continue; 71 72 if (vifi<0 || vifi>31) 73 continue; 74 75 viftable[vifi] = strdup(dev); 76 } 77 fclose(fp); 78 } 79 80 static void read_mroute_list(FILE *ofp) 81 { 82 char buf[256]; 83 FILE *fp = fopen("/proc/net/ip_mr_cache", "r"); 84 85 if (!fp) 86 return; 87 88 if (!fgets(buf, sizeof(buf), fp)) { 89 fclose(fp); 90 return; 91 } 92 93 while (fgets(buf, sizeof(buf), fp)) { 94 inet_prefix maddr, msrc; 95 unsigned pkts, b, w; 96 int vifi; 97 char oiflist[256]; 98 char sbuf[256]; 99 char mbuf[256]; 100 char obuf[256]; 101 102 oiflist[0] = 0; 103 if (sscanf(buf, "%x%x%d%u%u%u %[^\n]", 104 maddr.data, msrc.data, &vifi, 105 &pkts, &b, &w, oiflist) < 6) 106 continue; 107 108 if (vifi!=-1 && (vifi < 0 || vifi>31)) 109 continue; 110 111 if (filter_dev[0] && (vifi<0 || strcmp(filter_dev, viftable[vifi]))) 112 continue; 113 if (filter.mdst.family && inet_addr_match(&maddr, &filter.mdst, filter.mdst.bitlen)) 114 continue; 115 if (filter.msrc.family && inet_addr_match(&msrc, &filter.msrc, filter.msrc.bitlen)) 116 continue; 117 118 snprintf(obuf, sizeof(obuf), "(%s, %s)", 119 format_host(AF_INET, 4, &msrc.data[0], sbuf, sizeof(sbuf)), 120 format_host(AF_INET, 4, &maddr.data[0], mbuf, sizeof(mbuf))); 121 122 fprintf(ofp, "%-32s Iif: ", obuf); 123 124 if (vifi == -1) 125 fprintf(ofp, "unresolved "); 126 else 127 fprintf(ofp, "%-10s ", viftable[vifi]); 128 129 if (oiflist[0]) { 130 char *next = NULL; 131 char *p = oiflist; 132 int ovifi, ottl; 133 134 fprintf(ofp, "Oifs: "); 135 136 while (p) { 137 next = strchr(p, ' '); 138 if (next) { 139 *next = 0; 140 next++; 141 } 142 if (sscanf(p, "%d:%d", &ovifi, &ottl)<2) { 143 p = next; 144 continue; 145 } 146 p = next; 147 148 fprintf(ofp, "%s", viftable[ovifi]); 149 if (ottl>1) 150 fprintf(ofp, "(ttl %d) ", ovifi); 151 else 152 fprintf(ofp, " "); 153 } 154 } 155 156 if (show_stats && b) { 157 fprintf(ofp, "%s %u packets, %u bytes", _SL_, pkts, b); 158 if (w) 159 fprintf(ofp, ", %u arrived on wrong iif.", w); 160 } 161 fprintf(ofp, "\n"); 162 } 163 fclose(fp); 164 } 165 166 167 static int mroute_list(int argc, char **argv) 168 { 169 while (argc > 0) { 170 if (strcmp(*argv, "iif") == 0) { 171 NEXT_ARG(); 172 strncpy(filter_dev, *argv, sizeof(filter_dev)-1); 173 } else if (matches(*argv, "from") == 0) { 174 NEXT_ARG(); 175 get_prefix(&filter.msrc, *argv, AF_INET); 176 } else { 177 if (strcmp(*argv, "to") == 0) { 178 NEXT_ARG(); 179 } 180 if (matches(*argv, "help") == 0) 181 usage(); 182 get_prefix(&filter.mdst, *argv, AF_INET); 183 } 184 argv++; argc--; 185 } 186 187 read_viftable(); 188 read_mroute_list(stdout); 189 return 0; 190 } 191 192 int do_multiroute(int argc, char **argv) 193 { 194 if (argc < 1) 195 return mroute_list(0, NULL); 196 #if 0 197 if (matches(*argv, "add") == 0) 198 return mroute_modify(RTM_NEWADDR, argc-1, argv+1); 199 if (matches(*argv, "delete") == 0) 200 return mroute_modify(RTM_DELADDR, argc-1, argv+1); 201 if (matches(*argv, "get") == 0) 202 return mroute_get(argc-1, argv+1); 203 #endif 204 if (matches(*argv, "list") == 0 || matches(*argv, "show") == 0 205 || matches(*argv, "lst") == 0) 206 return mroute_list(argc-1, argv+1); 207 if (matches(*argv, "help") == 0) 208 usage(); 209 fprintf(stderr, "Command \"%s\" is unknown, try \"ip mroute help\".\n", *argv); 210 exit(-1); 211 } 212
