1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * iptunnel.c "ip tunnel"
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4 | *
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5 | * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
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6 | *
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7 | * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
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8 | *
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9 | *
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10 | * Changes:
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11 | *
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12 | * Rani Assaf <rani@magic.metawire.com> 980929: resolve addresses
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13 | * Rani Assaf <rani@magic.metawire.com> 980930: do not allow key for ipip/sit
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14 | * Phil Karn <karn@ka9q.ampr.org> 990408: "pmtudisc" flag
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15 | */
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16 |
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17 | #include <netinet/ip.h>
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18 | #include <net/if.h>
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19 | #include <net/if_arp.h>
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20 | #include <asm/types.h>
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21 | #ifndef __constant_htons
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22 | #define __constant_htons htons
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23 | #endif
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24 | #include <linux/if_tunnel.h>
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25 |
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26 | #include "ip_common.h" /* #include "libbb.h" is inside */
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27 | #include "rt_names.h"
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28 | #include "utils.h"
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29 |
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30 |
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31 | /* Dies on error */
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32 | static int do_ioctl_get_ifindex(char *dev)
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33 | {
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34 | struct ifreq ifr;
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35 | int fd;
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36 |
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37 | strncpy(ifr.ifr_name, dev, sizeof(ifr.ifr_name));
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38 | fd = xsocket(AF_INET, SOCK_DGRAM, 0);
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39 | xioctl(fd, SIOCGIFINDEX, &ifr);
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40 | close(fd);
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41 | return ifr.ifr_ifindex;
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42 | }
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43 |
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44 | static int do_ioctl_get_iftype(char *dev)
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45 | {
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46 | struct ifreq ifr;
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47 | int fd;
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48 | int err;
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49 |
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50 | strncpy(ifr.ifr_name, dev, sizeof(ifr.ifr_name));
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51 | fd = xsocket(AF_INET, SOCK_DGRAM, 0);
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52 | err = ioctl_or_warn(fd, SIOCGIFHWADDR, &ifr);
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53 | close(fd);
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54 | return err ? -1 : ifr.ifr_addr.sa_family;
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55 | }
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56 |
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57 | static char *do_ioctl_get_ifname(int idx)
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58 | {
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59 | struct ifreq ifr;
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60 | int fd;
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61 | int err;
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62 |
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63 | ifr.ifr_ifindex = idx;
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64 | fd = xsocket(AF_INET, SOCK_DGRAM, 0);
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65 | err = ioctl_or_warn(fd, SIOCGIFNAME, &ifr);
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66 | close(fd);
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67 | return err ? NULL : xstrndup(ifr.ifr_name, sizeof(ifr.ifr_name));
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68 | }
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69 |
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70 | static int do_get_ioctl(const char *basedev, struct ip_tunnel_parm *p)
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71 | {
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72 | struct ifreq ifr;
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73 | int fd;
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74 | int err;
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75 |
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76 | strncpy(ifr.ifr_name, basedev, sizeof(ifr.ifr_name));
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77 | ifr.ifr_ifru.ifru_data = (void*)p;
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78 | fd = xsocket(AF_INET, SOCK_DGRAM, 0);
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79 | err = ioctl_or_warn(fd, SIOCGETTUNNEL, &ifr);
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80 | close(fd);
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81 | return err;
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82 | }
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83 |
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84 | /* Dies on error, otherwise returns 0 */
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85 | static int do_add_ioctl(int cmd, const char *basedev, struct ip_tunnel_parm *p)
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86 | {
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87 | struct ifreq ifr;
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88 | int fd;
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89 |
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90 | if (cmd == SIOCCHGTUNNEL && p->name[0]) {
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91 | strncpy(ifr.ifr_name, p->name, sizeof(ifr.ifr_name));
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92 | } else {
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93 | strncpy(ifr.ifr_name, basedev, sizeof(ifr.ifr_name));
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94 | }
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95 | ifr.ifr_ifru.ifru_data = (void*)p;
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96 | fd = xsocket(AF_INET, SOCK_DGRAM, 0);
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97 | #if ENABLE_IOCTL_HEX2STR_ERROR
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98 | /* #define magic will turn ioctl# into string */
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99 | if (cmd == SIOCCHGTUNNEL)
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100 | xioctl(fd, SIOCCHGTUNNEL, &ifr);
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101 | else
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102 | xioctl(fd, SIOCADDTUNNEL, &ifr);
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103 | #else
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104 | xioctl(fd, cmd, &ifr);
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105 | #endif
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106 | close(fd);
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107 | return 0;
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108 | }
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109 |
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110 | /* Dies on error, otherwise returns 0 */
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111 | static int do_del_ioctl(const char *basedev, struct ip_tunnel_parm *p)
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112 | {
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113 | struct ifreq ifr;
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114 | int fd;
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115 |
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116 | if (p->name[0]) {
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117 | strncpy(ifr.ifr_name, p->name, sizeof(ifr.ifr_name));
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118 | } else {
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119 | strncpy(ifr.ifr_name, basedev, sizeof(ifr.ifr_name));
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120 | }
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121 | ifr.ifr_ifru.ifru_data = (void*)p;
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122 | fd = xsocket(AF_INET, SOCK_DGRAM, 0);
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123 | xioctl(fd, SIOCDELTUNNEL, &ifr);
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124 | close(fd);
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125 | return 0;
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126 | }
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127 |
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128 | /* Dies on error */
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129 | static void parse_args(int argc, char **argv, int cmd, struct ip_tunnel_parm *p)
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130 | {
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131 | static const char keywords[] ALIGN1 =
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132 | "mode\0""ipip\0""ip/ip\0""gre\0""gre/ip\0""sit\0""ipv6/ip\0"
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133 | "key\0""ikey\0""okey\0""seq\0""iseq\0""oseq\0"
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134 | "csum\0""icsum\0""ocsum\0""nopmtudisc\0""pmtudisc\0"
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135 | "remote\0""any\0""local\0""dev\0"
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136 | "ttl\0""inherit\0""tos\0""dsfield\0"
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137 | "name\0";
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138 | enum {
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139 | ARG_mode, ARG_ipip, ARG_ip_ip, ARG_gre, ARG_gre_ip, ARG_sit, ARG_ip6_ip,
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140 | ARG_key, ARG_ikey, ARG_okey, ARG_seq, ARG_iseq, ARG_oseq,
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141 | ARG_csum, ARG_icsum, ARG_ocsum, ARG_nopmtudisc, ARG_pmtudisc,
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142 | ARG_remote, ARG_any, ARG_local, ARG_dev,
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143 | ARG_ttl, ARG_inherit, ARG_tos, ARG_dsfield,
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144 | ARG_name
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145 | };
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146 | int count = 0;
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147 | char medium[IFNAMSIZ];
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148 | int key;
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149 |
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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 | key = index_in_strings(keywords, *argv);
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162 | if (key == ARG_mode) {
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163 | NEXT_ARG();
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164 | key = index_in_strings(keywords, *argv);
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165 | if (key == ARG_ipip ||
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166 | key == ARG_ip_ip) {
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167 | if (p->iph.protocol && p->iph.protocol != IPPROTO_IPIP) {
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168 | bb_error_msg_and_die("you managed to ask for more than one tunnel mode");
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169 | }
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170 | p->iph.protocol = IPPROTO_IPIP;
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171 | } else if (key == ARG_gre ||
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172 | key == ARG_gre_ip) {
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173 | if (p->iph.protocol && p->iph.protocol != IPPROTO_GRE) {
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174 | bb_error_msg_and_die("you managed to ask for more than one tunnel mode");
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175 | }
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176 | p->iph.protocol = IPPROTO_GRE;
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177 | } else if (key == ARG_sit ||
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178 | key == ARG_ip6_ip) {
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179 | if (p->iph.protocol && p->iph.protocol != IPPROTO_IPV6) {
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180 | bb_error_msg_and_die("you managed to ask for more than one tunnel mode");
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181 | }
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182 | p->iph.protocol = IPPROTO_IPV6;
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183 | } else {
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184 | bb_error_msg_and_die("cannot guess tunnel mode");
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185 | }
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186 | } else if (key == ARG_key) {
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187 | unsigned uval;
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188 | NEXT_ARG();
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189 | p->i_flags |= GRE_KEY;
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190 | p->o_flags |= GRE_KEY;
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191 | if (strchr(*argv, '.'))
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192 | p->i_key = p->o_key = get_addr32(*argv);
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193 | else {
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194 | if (get_unsigned(&uval, *argv, 0)<0) {
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195 | bb_error_msg_and_die("invalid value of \"key\"");
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196 | }
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197 | p->i_key = p->o_key = htonl(uval);
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198 | }
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199 | } else if (key == ARG_ikey) {
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200 | unsigned uval;
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201 | NEXT_ARG();
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202 | p->i_flags |= GRE_KEY;
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203 | if (strchr(*argv, '.'))
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204 | p->o_key = get_addr32(*argv);
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205 | else {
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206 | if (get_unsigned(&uval, *argv, 0)<0) {
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207 | bb_error_msg_and_die("invalid value of \"ikey\"");
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208 | }
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209 | p->i_key = htonl(uval);
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210 | }
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211 | } else if (key == ARG_okey) {
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212 | unsigned uval;
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213 | NEXT_ARG();
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214 | p->o_flags |= GRE_KEY;
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215 | if (strchr(*argv, '.'))
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216 | p->o_key = get_addr32(*argv);
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217 | else {
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218 | if (get_unsigned(&uval, *argv, 0)<0) {
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219 | bb_error_msg_and_die("invalid value of \"okey\"");
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220 | }
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221 | p->o_key = htonl(uval);
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222 | }
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223 | } else if (key == ARG_seq) {
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224 | p->i_flags |= GRE_SEQ;
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225 | p->o_flags |= GRE_SEQ;
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226 | } else if (key == ARG_iseq) {
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227 | p->i_flags |= GRE_SEQ;
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228 | } else if (key == ARG_oseq) {
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229 | p->o_flags |= GRE_SEQ;
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230 | } else if (key == ARG_csum) {
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231 | p->i_flags |= GRE_CSUM;
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232 | p->o_flags |= GRE_CSUM;
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233 | } else if (key == ARG_icsum) {
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234 | p->i_flags |= GRE_CSUM;
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235 | } else if (key == ARG_ocsum) {
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236 | p->o_flags |= GRE_CSUM;
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237 | } else if (key == ARG_nopmtudisc) {
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238 | p->iph.frag_off = 0;
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239 | } else if (key == ARG_pmtudisc) {
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240 | p->iph.frag_off = htons(IP_DF);
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241 | } else if (key == ARG_remote) {
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242 | NEXT_ARG();
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243 | key = index_in_strings(keywords, *argv);
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244 | if (key != ARG_any)
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245 | p->iph.daddr = get_addr32(*argv);
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246 | } else if (key == ARG_local) {
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247 | NEXT_ARG();
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248 | key = index_in_strings(keywords, *argv);
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249 | if (key != ARG_any)
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250 | p->iph.saddr = get_addr32(*argv);
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251 | } else if (key == ARG_dev) {
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252 | NEXT_ARG();
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253 | strncpy(medium, *argv, IFNAMSIZ-1);
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254 | } else if (key == ARG_ttl) {
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255 | unsigned uval;
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256 | NEXT_ARG();
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257 | key = index_in_strings(keywords, *argv);
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258 | if (key != ARG_inherit) {
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259 | if (get_unsigned(&uval, *argv, 0))
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260 | invarg(*argv, "TTL");
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261 | if (uval > 255)
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262 | invarg(*argv, "TTL must be <=255");
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263 | p->iph.ttl = uval;
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264 | }
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265 | } else if (key == ARG_tos ||
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266 | key == ARG_dsfield) {
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267 | uint32_t uval;
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268 | NEXT_ARG();
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269 | key = index_in_strings(keywords, *argv);
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270 | if (key != ARG_inherit) {
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271 | if (rtnl_dsfield_a2n(&uval, *argv))
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272 | invarg(*argv, "TOS");
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273 | p->iph.tos = uval;
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274 | } else
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275 | p->iph.tos = 1;
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276 | } else {
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277 | if (key == ARG_name) {
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278 | NEXT_ARG();
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279 | }
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280 | if (p->name[0])
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281 | duparg2("name", *argv);
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282 | strncpy(p->name, *argv, IFNAMSIZ);
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283 | if (cmd == SIOCCHGTUNNEL && count == 0) {
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284 | struct ip_tunnel_parm old_p;
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285 | memset(&old_p, 0, sizeof(old_p));
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286 | if (do_get_ioctl(*argv, &old_p))
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287 | exit(1);
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288 | *p = old_p;
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289 | }
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290 | }
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291 | count++;
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292 | argc--;
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293 | argv++;
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294 | }
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295 |
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296 | if (p->iph.protocol == 0) {
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297 | if (memcmp(p->name, "gre", 3) == 0)
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298 | p->iph.protocol = IPPROTO_GRE;
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299 | else if (memcmp(p->name, "ipip", 4) == 0)
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300 | p->iph.protocol = IPPROTO_IPIP;
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301 | else if (memcmp(p->name, "sit", 3) == 0)
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302 | p->iph.protocol = IPPROTO_IPV6;
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303 | }
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304 |
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305 | if (p->iph.protocol == IPPROTO_IPIP || p->iph.protocol == IPPROTO_IPV6) {
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306 | if ((p->i_flags & GRE_KEY) || (p->o_flags & GRE_KEY)) {
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307 | bb_error_msg_and_die("keys are not allowed with ipip and sit");
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308 | }
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309 | }
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310 |
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311 | if (medium[0]) {
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312 | p->link = do_ioctl_get_ifindex(medium);
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313 | }
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314 |
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315 | if (p->i_key == 0 && IN_MULTICAST(ntohl(p->iph.daddr))) {
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316 | p->i_key = p->iph.daddr;
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317 | p->i_flags |= GRE_KEY;
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318 | }
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319 | if (p->o_key == 0 && IN_MULTICAST(ntohl(p->iph.daddr))) {
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320 | p->o_key = p->iph.daddr;
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321 | p->o_flags |= GRE_KEY;
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322 | }
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323 | if (IN_MULTICAST(ntohl(p->iph.daddr)) && !p->iph.saddr) {
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324 | bb_error_msg_and_die("broadcast tunnel requires a source address");
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325 | }
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326 | }
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327 |
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328 |
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329 | /* Return value becomes exitcode. It's okay to not return at all */
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330 | static int do_add(int cmd, int argc, char **argv)
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331 | {
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332 | struct ip_tunnel_parm p;
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333 |
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334 | parse_args(argc, argv, cmd, &p);
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335 |
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336 | if (p.iph.ttl && p.iph.frag_off == 0) {
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337 | bb_error_msg_and_die("ttl != 0 and noptmudisc are incompatible");
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338 | }
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339 |
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340 | switch (p.iph.protocol) {
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341 | case IPPROTO_IPIP:
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342 | return do_add_ioctl(cmd, "tunl0", &p);
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343 | case IPPROTO_GRE:
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344 | return do_add_ioctl(cmd, "gre0", &p);
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345 | case IPPROTO_IPV6:
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346 | return do_add_ioctl(cmd, "sit0", &p);
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347 | default:
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348 | bb_error_msg_and_die("cannot determine tunnel mode (ipip, gre or sit)");
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349 | }
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350 | }
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351 |
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352 | /* Return value becomes exitcode. It's okay to not return at all */
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353 | static int do_del(int argc, char **argv)
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354 | {
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355 | struct ip_tunnel_parm p;
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356 |
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357 | parse_args(argc, argv, SIOCDELTUNNEL, &p);
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358 |
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359 | switch (p.iph.protocol) {
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360 | case IPPROTO_IPIP:
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361 | return do_del_ioctl("tunl0", &p);
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362 | case IPPROTO_GRE:
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363 | return do_del_ioctl("gre0", &p);
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364 | case IPPROTO_IPV6:
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365 | return do_del_ioctl("sit0", &p);
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366 | default:
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367 | return do_del_ioctl(p.name, &p);
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368 | }
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369 | }
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370 |
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371 | static void print_tunnel(struct ip_tunnel_parm *p)
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372 | {
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373 | char s1[256];
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374 | char s2[256];
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375 | char s3[64];
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376 | char s4[64];
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377 |
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378 | format_host(AF_INET, 4, &p->iph.daddr, s1, sizeof(s1));
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379 | format_host(AF_INET, 4, &p->iph.saddr, s2, sizeof(s2));
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380 | inet_ntop(AF_INET, &p->i_key, s3, sizeof(s3));
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381 | inet_ntop(AF_INET, &p->o_key, s4, sizeof(s4));
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382 |
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383 | printf("%s: %s/ip remote %s local %s ",
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384 | p->name,
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385 | p->iph.protocol == IPPROTO_IPIP ? "ip" :
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386 | (p->iph.protocol == IPPROTO_GRE ? "gre" :
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387 | (p->iph.protocol == IPPROTO_IPV6 ? "ipv6" : "unknown")),
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388 | p->iph.daddr ? s1 : "any", p->iph.saddr ? s2 : "any");
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389 | if (p->link) {
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390 | char *n = do_ioctl_get_ifname(p->link);
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391 | if (n) {
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392 | printf(" dev %s ", n);
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393 | free(n);
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394 | }
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395 | }
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396 | if (p->iph.ttl)
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397 | printf(" ttl %d ", p->iph.ttl);
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398 | else
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399 | printf(" ttl inherit ");
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400 | if (p->iph.tos) {
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401 | SPRINT_BUF(b1);
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402 | printf(" tos");
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403 | if (p->iph.tos & 1)
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404 | printf(" inherit");
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405 | if (p->iph.tos & ~1)
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406 | printf("%c%s ", p->iph.tos & 1 ? '/' : ' ',
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407 | rtnl_dsfield_n2a(p->iph.tos & ~1, b1, sizeof(b1)));
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408 | }
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409 | if (!(p->iph.frag_off & htons(IP_DF)))
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410 | printf(" nopmtudisc");
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411 |
|
---|
412 | if ((p->i_flags & GRE_KEY) && (p->o_flags & GRE_KEY) && p->o_key == p->i_key)
|
---|
413 | printf(" key %s", s3);
|
---|
414 | else if ((p->i_flags | p->o_flags) & GRE_KEY) {
|
---|
415 | if (p->i_flags & GRE_KEY)
|
---|
416 | printf(" ikey %s ", s3);
|
---|
417 | if (p->o_flags & GRE_KEY)
|
---|
418 | printf(" okey %s ", s4);
|
---|
419 | }
|
---|
420 |
|
---|
421 | if (p->i_flags & GRE_SEQ)
|
---|
422 | printf("%c Drop packets out of sequence.\n", _SL_);
|
---|
423 | if (p->i_flags & GRE_CSUM)
|
---|
424 | printf("%c Checksum in received packet is required.", _SL_);
|
---|
425 | if (p->o_flags & GRE_SEQ)
|
---|
426 | printf("%c Sequence packets on output.", _SL_);
|
---|
427 | if (p->o_flags & GRE_CSUM)
|
---|
428 | printf("%c Checksum output packets.", _SL_);
|
---|
429 | }
|
---|
430 |
|
---|
431 | static void do_tunnels_list(struct ip_tunnel_parm *p)
|
---|
432 | {
|
---|
433 | char name[IFNAMSIZ];
|
---|
434 | unsigned long rx_bytes, rx_packets, rx_errs, rx_drops,
|
---|
435 | rx_fifo, rx_frame,
|
---|
436 | tx_bytes, tx_packets, tx_errs, tx_drops,
|
---|
437 | tx_fifo, tx_colls, tx_carrier, rx_multi;
|
---|
438 | int type;
|
---|
439 | struct ip_tunnel_parm p1;
|
---|
440 | char buf[512];
|
---|
441 | FILE *fp = fopen_or_warn("/proc/net/dev", "r");
|
---|
442 |
|
---|
443 | if (fp == NULL) {
|
---|
444 | return;
|
---|
445 | }
|
---|
446 |
|
---|
447 | fgets(buf, sizeof(buf), fp);
|
---|
448 | fgets(buf, sizeof(buf), fp);
|
---|
449 |
|
---|
450 | while (fgets(buf, sizeof(buf), fp) != NULL) {
|
---|
451 | char *ptr;
|
---|
452 |
|
---|
453 | /*buf[sizeof(buf) - 1] = 0; - fgets is safe anyway */
|
---|
454 | ptr = strchr(buf, ':');
|
---|
455 | if (ptr == NULL ||
|
---|
456 | (*ptr++ = 0, sscanf(buf, "%s", name) != 1)) {
|
---|
457 | bb_error_msg("wrong format of /proc/net/dev");
|
---|
458 | return;
|
---|
459 | }
|
---|
460 | if (sscanf(ptr, "%lu%lu%lu%lu%lu%lu%lu%*d%lu%lu%lu%lu%lu%lu%lu",
|
---|
461 | &rx_bytes, &rx_packets, &rx_errs, &rx_drops,
|
---|
462 | &rx_fifo, &rx_frame, &rx_multi,
|
---|
463 | &tx_bytes, &tx_packets, &tx_errs, &tx_drops,
|
---|
464 | &tx_fifo, &tx_colls, &tx_carrier) != 14)
|
---|
465 | continue;
|
---|
466 | if (p->name[0] && strcmp(p->name, name))
|
---|
467 | continue;
|
---|
468 | type = do_ioctl_get_iftype(name);
|
---|
469 | if (type == -1) {
|
---|
470 | bb_error_msg("cannot get type of [%s]", name);
|
---|
471 | continue;
|
---|
472 | }
|
---|
473 | if (type != ARPHRD_TUNNEL && type != ARPHRD_IPGRE && type != ARPHRD_SIT)
|
---|
474 | continue;
|
---|
475 | memset(&p1, 0, sizeof(p1));
|
---|
476 | if (do_get_ioctl(name, &p1))
|
---|
477 | continue;
|
---|
478 | if ((p->link && p1.link != p->link) ||
|
---|
479 | (p->name[0] && strcmp(p1.name, p->name)) ||
|
---|
480 | (p->iph.daddr && p1.iph.daddr != p->iph.daddr) ||
|
---|
481 | (p->iph.saddr && p1.iph.saddr != p->iph.saddr) ||
|
---|
482 | (p->i_key && p1.i_key != p->i_key))
|
---|
483 | continue;
|
---|
484 | print_tunnel(&p1);
|
---|
485 | puts("");
|
---|
486 | }
|
---|
487 | }
|
---|
488 |
|
---|
489 | /* Return value becomes exitcode. It's okay to not return at all */
|
---|
490 | static int do_show(int argc, char **argv)
|
---|
491 | {
|
---|
492 | int err;
|
---|
493 | struct ip_tunnel_parm p;
|
---|
494 |
|
---|
495 | parse_args(argc, argv, SIOCGETTUNNEL, &p);
|
---|
496 |
|
---|
497 | switch (p.iph.protocol) {
|
---|
498 | case IPPROTO_IPIP:
|
---|
499 | err = do_get_ioctl(p.name[0] ? p.name : "tunl0", &p);
|
---|
500 | break;
|
---|
501 | case IPPROTO_GRE:
|
---|
502 | err = do_get_ioctl(p.name[0] ? p.name : "gre0", &p);
|
---|
503 | break;
|
---|
504 | case IPPROTO_IPV6:
|
---|
505 | err = do_get_ioctl(p.name[0] ? p.name : "sit0", &p);
|
---|
506 | break;
|
---|
507 | default:
|
---|
508 | do_tunnels_list(&p);
|
---|
509 | return 0;
|
---|
510 | }
|
---|
511 | if (err)
|
---|
512 | return -1;
|
---|
513 |
|
---|
514 | print_tunnel(&p);
|
---|
515 | puts("");
|
---|
516 | return 0;
|
---|
517 | }
|
---|
518 |
|
---|
519 | /* Return value becomes exitcode. It's okay to not return at all */
|
---|
520 | int do_iptunnel(int argc, char **argv)
|
---|
521 | {
|
---|
522 | static const char keywords[] ALIGN1 =
|
---|
523 | "add\0""change\0""delete\0""show\0""list\0""lst\0";
|
---|
524 | enum { ARG_add = 0, ARG_change, ARG_del, ARG_show, ARG_list, ARG_lst };
|
---|
525 | int key;
|
---|
526 |
|
---|
527 | if (argc) {
|
---|
528 | key = index_in_substrings(keywords, *argv);
|
---|
529 | if (key < 0)
|
---|
530 | bb_error_msg_and_die(bb_msg_invalid_arg, *argv, applet_name);
|
---|
531 | --argc;
|
---|
532 | ++argv;
|
---|
533 | if (key == ARG_add)
|
---|
534 | return do_add(SIOCADDTUNNEL, argc, argv);
|
---|
535 | if (key == ARG_change)
|
---|
536 | return do_add(SIOCCHGTUNNEL, argc, argv);
|
---|
537 | if (key == ARG_del)
|
---|
538 | return do_del(argc, argv);
|
---|
539 | }
|
---|
540 | return do_show(argc, argv);
|
---|
541 | }
|
---|