1 | /*
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2 | * iptunnel.c "ip tunnel"
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3 | *
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4 | * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
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5 | *
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6 | * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
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7 | *
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8 | *
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9 | * Changes:
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10 | *
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11 | * Rani Assaf <rani@magic.metawire.com> 980929: resolve addresses
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12 | * Rani Assaf <rani@magic.metawire.com> 980930: do not allow key for ipip/sit
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13 | * Phil Karn <karn@ka9q.ampr.org> 990408: "pmtudisc" flag
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14 | */
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15 |
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16 | #include "libbb.h"
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17 | #include <sys/socket.h>
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18 | #include <sys/ioctl.h>
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19 |
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20 | #include <string.h>
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21 | #include <unistd.h>
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22 |
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23 | #include <netinet/ip.h>
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24 |
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25 | #include <net/if.h>
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26 | #include <net/if_arp.h>
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27 |
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28 | #include <asm/types.h>
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29 | #ifndef __constant_htons
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30 | #define __constant_htons htons
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31 | #endif
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32 | #include <linux/if_tunnel.h>
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33 |
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34 | #include "rt_names.h"
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35 | #include "utils.h"
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36 | #include "ip_common.h"
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37 |
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38 |
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39 | static int do_ioctl_get_ifindex(char *dev)
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40 | {
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41 | struct ifreq ifr;
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42 | int fd;
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43 |
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44 | strcpy(ifr.ifr_name, dev);
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45 | fd = socket(AF_INET, SOCK_DGRAM, 0);
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46 | if (ioctl(fd, SIOCGIFINDEX, &ifr)) {
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47 | bb_perror_msg("ioctl");
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48 | return 0;
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49 | }
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50 | close(fd);
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51 | return ifr.ifr_ifindex;
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52 | }
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53 |
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54 | static int do_ioctl_get_iftype(char *dev)
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55 | {
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56 | struct ifreq ifr;
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57 | int fd;
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58 |
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59 | strcpy(ifr.ifr_name, dev);
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60 | fd = socket(AF_INET, SOCK_DGRAM, 0);
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61 | if (ioctl(fd, SIOCGIFHWADDR, &ifr)) {
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62 | bb_perror_msg("ioctl");
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63 | return -1;
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64 | }
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65 | close(fd);
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66 | return ifr.ifr_addr.sa_family;
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67 | }
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68 |
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69 |
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70 | static char *do_ioctl_get_ifname(int idx)
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71 | {
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72 | static struct ifreq ifr;
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73 | int fd;
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74 |
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75 | ifr.ifr_ifindex = idx;
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76 | fd = socket(AF_INET, SOCK_DGRAM, 0);
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77 | if (ioctl(fd, SIOCGIFNAME, &ifr)) {
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78 | bb_perror_msg("ioctl");
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79 | return NULL;
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80 | }
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81 | close(fd);
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82 | return ifr.ifr_name;
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83 | }
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84 |
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85 |
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86 |
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87 | static int do_get_ioctl(char *basedev, struct ip_tunnel_parm *p)
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88 | {
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89 | struct ifreq ifr;
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90 | int fd;
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91 | int err;
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92 |
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93 | strcpy(ifr.ifr_name, basedev);
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94 | ifr.ifr_ifru.ifru_data = (void*)p;
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95 | fd = socket(AF_INET, SOCK_DGRAM, 0);
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96 | err = ioctl(fd, SIOCGETTUNNEL, &ifr);
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97 | if (err) {
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98 | bb_perror_msg("ioctl");
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99 | }
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100 | close(fd);
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101 | return err;
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102 | }
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103 |
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104 | static int do_add_ioctl(int cmd, char *basedev, struct ip_tunnel_parm *p)
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105 | {
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106 | struct ifreq ifr;
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107 | int fd;
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108 | int err;
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109 |
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110 | if (cmd == SIOCCHGTUNNEL && p->name[0]) {
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111 | strcpy(ifr.ifr_name, p->name);
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112 | } else {
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113 | strcpy(ifr.ifr_name, basedev);
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114 | }
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115 | ifr.ifr_ifru.ifru_data = (void*)p;
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116 | fd = socket(AF_INET, SOCK_DGRAM, 0);
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117 | err = ioctl(fd, cmd, &ifr);
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118 | if (err) {
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119 | bb_perror_msg("ioctl");
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120 | }
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121 | close(fd);
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122 | return err;
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123 | }
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124 |
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125 | static int do_del_ioctl(char *basedev, struct ip_tunnel_parm *p)
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126 | {
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127 | struct ifreq ifr;
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128 | int fd;
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129 | int err;
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130 |
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131 | if (p->name[0]) {
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132 | strcpy(ifr.ifr_name, p->name);
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133 | } else {
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134 | strcpy(ifr.ifr_name, basedev);
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135 | }
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136 | ifr.ifr_ifru.ifru_data = (void*)p;
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137 | fd = socket(AF_INET, SOCK_DGRAM, 0);
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138 | err = ioctl(fd, SIOCDELTUNNEL, &ifr);
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139 | if (err) {
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140 | bb_perror_msg("ioctl");
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141 | }
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142 | close(fd);
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143 | return err;
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144 | }
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145 |
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146 | static int parse_args(int argc, char **argv, int cmd, struct ip_tunnel_parm *p)
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147 | {
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148 | int count = 0;
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149 | char medium[IFNAMSIZ];
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150 | memset(p, 0, sizeof(*p));
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151 | memset(&medium, 0, sizeof(medium));
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152 |
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153 | p->iph.version = 4;
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154 | p->iph.ihl = 5;
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155 | #ifndef IP_DF
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156 | #define IP_DF 0x4000 /* Flag: "Don't Fragment" */
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157 | #endif
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158 | p->iph.frag_off = htons(IP_DF);
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159 |
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160 | while (argc > 0) {
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161 | if (strcmp(*argv, "mode") == 0) {
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162 | NEXT_ARG();
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163 | if (strcmp(*argv, "ipip") == 0 ||
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164 | strcmp(*argv, "ip/ip") == 0) {
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165 | if (p->iph.protocol && p->iph.protocol != IPPROTO_IPIP) {
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166 | bb_error_msg("You managed to ask for more than one tunnel mode.");
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167 | exit(-1);
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168 | }
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169 | p->iph.protocol = IPPROTO_IPIP;
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170 | } else if (strcmp(*argv, "gre") == 0 ||
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171 | strcmp(*argv, "gre/ip") == 0) {
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172 | if (p->iph.protocol && p->iph.protocol != IPPROTO_GRE) {
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173 | bb_error_msg("You managed to ask for more than one tunnel mode.");
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174 | exit(-1);
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175 | }
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176 | p->iph.protocol = IPPROTO_GRE;
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177 | } else if (strcmp(*argv, "sit") == 0 ||
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178 | strcmp(*argv, "ipv6/ip") == 0) {
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179 | if (p->iph.protocol && p->iph.protocol != IPPROTO_IPV6) {
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180 | bb_error_msg("You managed to ask for more than one tunnel mode.");
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181 | exit(-1);
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182 | }
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183 | p->iph.protocol = IPPROTO_IPV6;
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184 | } else {
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185 | bb_error_msg("Cannot guess tunnel mode.");
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186 | exit(-1);
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187 | }
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188 | } else if (strcmp(*argv, "key") == 0) {
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189 | unsigned uval;
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190 | NEXT_ARG();
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191 | p->i_flags |= GRE_KEY;
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192 | p->o_flags |= GRE_KEY;
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193 | if (strchr(*argv, '.'))
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194 | p->i_key = p->o_key = get_addr32(*argv);
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195 | else {
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196 | if (get_unsigned(&uval, *argv, 0)<0) {
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197 | bb_error_msg("invalid value of \"key\"");
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198 | exit(-1);
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199 | }
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200 | p->i_key = p->o_key = htonl(uval);
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201 | }
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202 | } else if (strcmp(*argv, "ikey") == 0) {
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203 | unsigned uval;
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204 | NEXT_ARG();
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205 | p->i_flags |= GRE_KEY;
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206 | if (strchr(*argv, '.'))
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207 | p->o_key = get_addr32(*argv);
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208 | else {
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209 | if (get_unsigned(&uval, *argv, 0)<0) {
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210 | bb_error_msg("invalid value of \"ikey\"");
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211 | exit(-1);
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212 | }
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213 | p->i_key = htonl(uval);
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214 | }
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215 | } else if (strcmp(*argv, "okey") == 0) {
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216 | unsigned uval;
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217 | NEXT_ARG();
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218 | p->o_flags |= GRE_KEY;
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219 | if (strchr(*argv, '.'))
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220 | p->o_key = get_addr32(*argv);
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221 | else {
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222 | if (get_unsigned(&uval, *argv, 0)<0) {
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223 | bb_error_msg("invalid value of \"okey\"");
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224 | exit(-1);
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225 | }
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226 | p->o_key = htonl(uval);
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227 | }
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228 | } else if (strcmp(*argv, "seq") == 0) {
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229 | p->i_flags |= GRE_SEQ;
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230 | p->o_flags |= GRE_SEQ;
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231 | } else if (strcmp(*argv, "iseq") == 0) {
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232 | p->i_flags |= GRE_SEQ;
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233 | } else if (strcmp(*argv, "oseq") == 0) {
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234 | p->o_flags |= GRE_SEQ;
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235 | } else if (strcmp(*argv, "csum") == 0) {
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236 | p->i_flags |= GRE_CSUM;
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237 | p->o_flags |= GRE_CSUM;
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238 | } else if (strcmp(*argv, "icsum") == 0) {
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239 | p->i_flags |= GRE_CSUM;
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240 | } else if (strcmp(*argv, "ocsum") == 0) {
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241 | p->o_flags |= GRE_CSUM;
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242 | } else if (strcmp(*argv, "nopmtudisc") == 0) {
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243 | p->iph.frag_off = 0;
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244 | } else if (strcmp(*argv, "pmtudisc") == 0) {
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245 | p->iph.frag_off = htons(IP_DF);
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246 | } else if (strcmp(*argv, "remote") == 0) {
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247 | NEXT_ARG();
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248 | if (strcmp(*argv, "any"))
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249 | p->iph.daddr = get_addr32(*argv);
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250 | } else if (strcmp(*argv, "local") == 0) {
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251 | NEXT_ARG();
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252 | if (strcmp(*argv, "any"))
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253 | p->iph.saddr = get_addr32(*argv);
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254 | } else if (strcmp(*argv, "dev") == 0) {
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255 | NEXT_ARG();
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256 | strncpy(medium, *argv, IFNAMSIZ-1);
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257 | } else if (strcmp(*argv, "ttl") == 0) {
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258 | unsigned uval;
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259 | NEXT_ARG();
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260 | if (strcmp(*argv, "inherit") != 0) {
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261 | if (get_unsigned(&uval, *argv, 0))
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262 | invarg(*argv, "TTL");
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263 | if (uval > 255)
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264 | invarg(*argv, "TTL must be <=255");
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265 | p->iph.ttl = uval;
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266 | }
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267 | } else if (strcmp(*argv, "tos") == 0 ||
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268 | matches(*argv, "dsfield") == 0) {
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269 | __u32 uval;
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270 | NEXT_ARG();
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271 | if (strcmp(*argv, "inherit") != 0) {
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272 | if (rtnl_dsfield_a2n(&uval, *argv))
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273 | invarg(*argv, "TOS");
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274 | p->iph.tos = uval;
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275 | } else
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276 | p->iph.tos = 1;
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277 | } else {
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278 | if (strcmp(*argv, "name") == 0) {
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279 | NEXT_ARG();
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280 | }
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281 | if (p->name[0])
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282 | duparg2("name", *argv);
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283 | strncpy(p->name, *argv, IFNAMSIZ);
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284 | if (cmd == SIOCCHGTUNNEL && count == 0) {
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285 | struct ip_tunnel_parm old_p;
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286 | memset(&old_p, 0, sizeof(old_p));
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287 | if (do_get_ioctl(*argv, &old_p))
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288 | return -1;
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289 | *p = old_p;
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290 | }
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291 | }
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292 | count++;
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293 | argc--; argv++;
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294 | }
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295 |
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296 |
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297 | if (p->iph.protocol == 0) {
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298 | if (memcmp(p->name, "gre", 3) == 0)
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299 | p->iph.protocol = IPPROTO_GRE;
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300 | else if (memcmp(p->name, "ipip", 4) == 0)
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301 | p->iph.protocol = IPPROTO_IPIP;
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302 | else if (memcmp(p->name, "sit", 3) == 0)
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303 | p->iph.protocol = IPPROTO_IPV6;
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304 | }
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305 |
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306 | if (p->iph.protocol == IPPROTO_IPIP || p->iph.protocol == IPPROTO_IPV6) {
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307 | if ((p->i_flags & GRE_KEY) || (p->o_flags & GRE_KEY)) {
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308 | bb_error_msg("Keys are not allowed with ipip and sit.");
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309 | return -1;
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310 | }
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311 | }
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312 |
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313 | if (medium[0]) {
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314 | p->link = do_ioctl_get_ifindex(medium);
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315 | if (p->link == 0)
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316 | return -1;
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317 | }
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318 |
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319 | if (p->i_key == 0 && IN_MULTICAST(ntohl(p->iph.daddr))) {
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320 | p->i_key = p->iph.daddr;
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321 | p->i_flags |= GRE_KEY;
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322 | }
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323 | if (p->o_key == 0 && IN_MULTICAST(ntohl(p->iph.daddr))) {
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324 | p->o_key = p->iph.daddr;
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325 | p->o_flags |= GRE_KEY;
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326 | }
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327 | if (IN_MULTICAST(ntohl(p->iph.daddr)) && !p->iph.saddr) {
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328 | bb_error_msg("Broadcast tunnel requires a source address.");
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329 | return -1;
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330 | }
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331 | return 0;
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332 | }
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333 |
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334 |
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335 | static int do_add(int cmd, int argc, char **argv)
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336 | {
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337 | struct ip_tunnel_parm p;
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338 |
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339 | if (parse_args(argc, argv, cmd, &p) < 0)
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340 | return -1;
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341 |
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342 | if (p.iph.ttl && p.iph.frag_off == 0) {
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343 | bb_error_msg("ttl != 0 and noptmudisc are incompatible");
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344 | return -1;
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345 | }
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346 |
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347 | switch (p.iph.protocol) {
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348 | case IPPROTO_IPIP:
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349 | return do_add_ioctl(cmd, "tunl0", &p);
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350 | case IPPROTO_GRE:
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351 | return do_add_ioctl(cmd, "gre0", &p);
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352 | case IPPROTO_IPV6:
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353 | return do_add_ioctl(cmd, "sit0", &p);
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354 | default:
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355 | bb_error_msg("cannot determine tunnel mode (ipip, gre or sit)");
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356 | return -1;
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357 | }
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358 | return -1;
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359 | }
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360 |
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361 | static int do_del(int argc, char **argv)
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362 | {
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363 | struct ip_tunnel_parm p;
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364 |
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365 | if (parse_args(argc, argv, SIOCDELTUNNEL, &p) < 0)
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366 | return -1;
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367 |
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368 | switch (p.iph.protocol) {
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369 | case IPPROTO_IPIP:
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370 | return do_del_ioctl("tunl0", &p);
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371 | case IPPROTO_GRE:
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372 | return do_del_ioctl("gre0", &p);
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373 | case IPPROTO_IPV6:
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374 | return do_del_ioctl("sit0", &p);
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375 | default:
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376 | return do_del_ioctl(p.name, &p);
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377 | }
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378 | return -1;
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379 | }
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380 |
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381 | static void print_tunnel(struct ip_tunnel_parm *p)
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382 | {
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383 | char s1[256];
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384 | char s2[256];
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385 | char s3[64];
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386 | char s4[64];
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387 |
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388 | format_host(AF_INET, 4, &p->iph.daddr, s1, sizeof(s1));
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389 | format_host(AF_INET, 4, &p->iph.saddr, s2, sizeof(s2));
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390 | inet_ntop(AF_INET, &p->i_key, s3, sizeof(s3));
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391 | inet_ntop(AF_INET, &p->o_key, s4, sizeof(s4));
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392 |
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393 | printf("%s: %s/ip remote %s local %s ",
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394 | p->name,
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395 | p->iph.protocol == IPPROTO_IPIP ? "ip" :
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396 | (p->iph.protocol == IPPROTO_GRE ? "gre" :
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397 | (p->iph.protocol == IPPROTO_IPV6 ? "ipv6" : "unknown")),
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398 | p->iph.daddr ? s1 : "any", p->iph.saddr ? s2 : "any");
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399 | if (p->link) {
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400 | char *n = do_ioctl_get_ifname(p->link);
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401 | if (n)
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402 | printf(" dev %s ", n);
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403 | }
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404 | if (p->iph.ttl)
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405 | printf(" ttl %d ", p->iph.ttl);
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406 | else
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407 | printf(" ttl inherit ");
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408 | if (p->iph.tos) {
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409 | SPRINT_BUF(b1);
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410 | printf(" tos");
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411 | if (p->iph.tos&1)
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412 | printf(" inherit");
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413 | if (p->iph.tos&~1)
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414 | printf("%c%s ", p->iph.tos&1 ? '/' : ' ',
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415 | rtnl_dsfield_n2a(p->iph.tos&~1, b1, sizeof(b1)));
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416 | }
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417 | if (!(p->iph.frag_off&htons(IP_DF)))
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418 | printf(" nopmtudisc");
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419 |
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420 | if ((p->i_flags&GRE_KEY) && (p->o_flags&GRE_KEY) && p->o_key == p->i_key)
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421 | printf(" key %s", s3);
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422 | else if ((p->i_flags|p->o_flags)&GRE_KEY) {
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423 | if (p->i_flags&GRE_KEY)
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424 | printf(" ikey %s ", s3);
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425 | if (p->o_flags&GRE_KEY)
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426 | printf(" okey %s ", s4);
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427 | }
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428 |
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429 | if (p->i_flags&GRE_SEQ)
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430 | printf("%s Drop packets out of sequence.\n", _SL_);
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431 | if (p->i_flags&GRE_CSUM)
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432 | printf("%s Checksum in received packet is required.", _SL_);
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433 | if (p->o_flags&GRE_SEQ)
|
---|
434 | printf("%s Sequence packets on output.", _SL_);
|
---|
435 | if (p->o_flags&GRE_CSUM)
|
---|
436 | printf("%s Checksum output packets.", _SL_);
|
---|
437 | }
|
---|
438 |
|
---|
439 | static int do_tunnels_list(struct ip_tunnel_parm *p)
|
---|
440 | {
|
---|
441 | char name[IFNAMSIZ];
|
---|
442 | unsigned long rx_bytes, rx_packets, rx_errs, rx_drops,
|
---|
443 | rx_fifo, rx_frame,
|
---|
444 | tx_bytes, tx_packets, tx_errs, tx_drops,
|
---|
445 | tx_fifo, tx_colls, tx_carrier, rx_multi;
|
---|
446 | int type;
|
---|
447 | struct ip_tunnel_parm p1;
|
---|
448 |
|
---|
449 | char buf[512];
|
---|
450 | FILE *fp = fopen("/proc/net/dev", "r");
|
---|
451 | if (fp == NULL) {
|
---|
452 | perror("fopen");
|
---|
453 | return -1;
|
---|
454 | }
|
---|
455 |
|
---|
456 | fgets(buf, sizeof(buf), fp);
|
---|
457 | fgets(buf, sizeof(buf), fp);
|
---|
458 |
|
---|
459 | while (fgets(buf, sizeof(buf), fp) != NULL) {
|
---|
460 | char *ptr;
|
---|
461 | buf[sizeof(buf) - 1] = 0;
|
---|
462 | if ((ptr = strchr(buf, ':')) == NULL ||
|
---|
463 | (*ptr++ = 0, sscanf(buf, "%s", name) != 1)) {
|
---|
464 | bb_error_msg("Wrong format of /proc/net/dev. Sorry.");
|
---|
465 | return -1;
|
---|
466 | }
|
---|
467 | if (sscanf(ptr, "%lu%lu%lu%lu%lu%lu%lu%*d%lu%lu%lu%lu%lu%lu%lu",
|
---|
468 | &rx_bytes, &rx_packets, &rx_errs, &rx_drops,
|
---|
469 | &rx_fifo, &rx_frame, &rx_multi,
|
---|
470 | &tx_bytes, &tx_packets, &tx_errs, &tx_drops,
|
---|
471 | &tx_fifo, &tx_colls, &tx_carrier) != 14)
|
---|
472 | continue;
|
---|
473 | if (p->name[0] && strcmp(p->name, name))
|
---|
474 | continue;
|
---|
475 | type = do_ioctl_get_iftype(name);
|
---|
476 | if (type == -1) {
|
---|
477 | bb_error_msg("Failed to get type of [%s]", name);
|
---|
478 | continue;
|
---|
479 | }
|
---|
480 | if (type != ARPHRD_TUNNEL && type != ARPHRD_IPGRE && type != ARPHRD_SIT)
|
---|
481 | continue;
|
---|
482 | memset(&p1, 0, sizeof(p1));
|
---|
483 | if (do_get_ioctl(name, &p1))
|
---|
484 | continue;
|
---|
485 | if ((p->link && p1.link != p->link) ||
|
---|
486 | (p->name[0] && strcmp(p1.name, p->name)) ||
|
---|
487 | (p->iph.daddr && p1.iph.daddr != p->iph.daddr) ||
|
---|
488 | (p->iph.saddr && p1.iph.saddr != p->iph.saddr) ||
|
---|
489 | (p->i_key && p1.i_key != p->i_key))
|
---|
490 | continue;
|
---|
491 | print_tunnel(&p1);
|
---|
492 | printf("\n");
|
---|
493 | }
|
---|
494 | return 0;
|
---|
495 | }
|
---|
496 |
|
---|
497 | static int do_show(int argc, char **argv)
|
---|
498 | {
|
---|
499 | int err;
|
---|
500 | struct ip_tunnel_parm p;
|
---|
501 |
|
---|
502 | if (parse_args(argc, argv, SIOCGETTUNNEL, &p) < 0)
|
---|
503 | return -1;
|
---|
504 |
|
---|
505 | switch (p.iph.protocol) {
|
---|
506 | case IPPROTO_IPIP:
|
---|
507 | err = do_get_ioctl(p.name[0] ? p.name : "tunl0", &p);
|
---|
508 | break;
|
---|
509 | case IPPROTO_GRE:
|
---|
510 | err = do_get_ioctl(p.name[0] ? p.name : "gre0", &p);
|
---|
511 | break;
|
---|
512 | case IPPROTO_IPV6:
|
---|
513 | err = do_get_ioctl(p.name[0] ? p.name : "sit0", &p);
|
---|
514 | break;
|
---|
515 | default:
|
---|
516 | do_tunnels_list(&p);
|
---|
517 | return 0;
|
---|
518 | }
|
---|
519 | if (err)
|
---|
520 | return -1;
|
---|
521 |
|
---|
522 | print_tunnel(&p);
|
---|
523 | printf("\n");
|
---|
524 | return 0;
|
---|
525 | }
|
---|
526 |
|
---|
527 | int do_iptunnel(int argc, char **argv)
|
---|
528 | {
|
---|
529 | if (argc > 0) {
|
---|
530 | if (matches(*argv, "add") == 0)
|
---|
531 | return do_add(SIOCADDTUNNEL, argc-1, argv+1);
|
---|
532 | if (matches(*argv, "change") == 0)
|
---|
533 | return do_add(SIOCCHGTUNNEL, argc-1, argv+1);
|
---|
534 | if (matches(*argv, "del") == 0)
|
---|
535 | return do_del(argc-1, argv+1);
|
---|
536 | if (matches(*argv, "show") == 0 ||
|
---|
537 | matches(*argv, "lst") == 0 ||
|
---|
538 | matches(*argv, "list") == 0)
|
---|
539 | return do_show(argc-1, argv+1);
|
---|
540 | } else
|
---|
541 | return do_show(0, NULL);
|
---|
542 |
|
---|
543 | bb_error_msg("Command \"%s\" is unknown.", *argv);
|
---|
544 | exit(-1);
|
---|
545 | }
|
---|