1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * This program is free software; you can redistribute it and/or
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4 | * modify it under the terms of the GNU General Public License
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5 | * as published by the Free Software Foundation; either version
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6 | * 2 of the License, or (at your option) any later version.
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7 | *
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8 | * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
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9 | */
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10 |
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11 | #include <net/if.h> /* struct ifreq and co. */
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12 |
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13 | #include "libbb.h"
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14 | #include "libnetlink.h"
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15 | #include "ll_map.h"
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16 |
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17 | struct idxmap {
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18 | struct idxmap *next;
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19 | int index;
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20 | int type;
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21 | int alen;
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22 | unsigned flags;
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23 | unsigned char addr[8];
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24 | char name[16];
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25 | };
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26 |
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27 | static struct idxmap **idxmap; /* treat as *idxmap[16] */
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28 |
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29 | static struct idxmap *find_by_index(int idx)
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30 | {
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31 | struct idxmap *im;
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32 |
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33 | if (idxmap)
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34 | for (im = idxmap[idx & 0xF]; im; im = im->next)
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35 | if (im->index == idx)
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36 | return im;
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37 | return NULL;
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38 | }
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39 |
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40 | int FAST_FUNC ll_remember_index(const struct sockaddr_nl *who UNUSED_PARAM,
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41 | struct nlmsghdr *n,
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42 | void *arg UNUSED_PARAM)
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43 | {
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44 | int h;
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45 | struct ifinfomsg *ifi = NLMSG_DATA(n);
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46 | struct idxmap *im, **imp;
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47 | struct rtattr *tb[IFLA_MAX+1];
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48 |
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49 | if (n->nlmsg_type != RTM_NEWLINK)
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50 | return 0;
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51 |
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52 | if (n->nlmsg_len < NLMSG_LENGTH(sizeof(ifi)))
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53 | return -1;
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54 |
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55 | memset(tb, 0, sizeof(tb));
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56 | parse_rtattr(tb, IFLA_MAX, IFLA_RTA(ifi), IFLA_PAYLOAD(n));
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57 | if (tb[IFLA_IFNAME] == NULL)
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58 | return 0;
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59 |
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60 | if (!idxmap)
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61 | idxmap = xzalloc(sizeof(idxmap[0]) * 16);
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62 |
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63 | h = ifi->ifi_index & 0xF;
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64 | for (imp = &idxmap[h]; (im = *imp) != NULL; imp = &im->next)
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65 | if (im->index == ifi->ifi_index)
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66 | goto found;
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67 |
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68 | im = xmalloc(sizeof(*im));
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69 | im->next = *imp;
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70 | im->index = ifi->ifi_index;
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71 | *imp = im;
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72 | found:
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73 | im->type = ifi->ifi_type;
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74 | im->flags = ifi->ifi_flags;
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75 | if (tb[IFLA_ADDRESS]) {
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76 | int alen;
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77 | im->alen = alen = RTA_PAYLOAD(tb[IFLA_ADDRESS]);
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78 | if (alen > (int)sizeof(im->addr))
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79 | alen = sizeof(im->addr);
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80 | memcpy(im->addr, RTA_DATA(tb[IFLA_ADDRESS]), alen);
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81 | } else {
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82 | im->alen = 0;
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83 | memset(im->addr, 0, sizeof(im->addr));
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84 | }
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85 | strcpy(im->name, RTA_DATA(tb[IFLA_IFNAME]));
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86 | return 0;
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87 | }
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88 |
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89 | const char FAST_FUNC *ll_idx_n2a(int idx, char *buf)
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90 | {
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91 | struct idxmap *im;
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92 |
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93 | if (idx == 0)
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94 | return "*";
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95 | im = find_by_index(idx);
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96 | if (im)
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97 | return im->name;
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98 | snprintf(buf, 16, "if%d", idx);
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99 | return buf;
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100 | }
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101 |
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102 |
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103 | const char FAST_FUNC *ll_index_to_name(int idx)
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104 | {
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105 | static char nbuf[16];
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106 |
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107 | return ll_idx_n2a(idx, nbuf);
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108 | }
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109 |
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110 | #ifdef UNUSED
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111 | int ll_index_to_type(int idx)
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112 | {
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113 | struct idxmap *im;
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114 |
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115 | if (idx == 0)
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116 | return -1;
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117 | im = find_by_index(idx);
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118 | if (im)
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119 | return im->type;
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120 | return -1;
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121 | }
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122 | #endif
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123 |
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124 | unsigned FAST_FUNC ll_index_to_flags(int idx)
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125 | {
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126 | struct idxmap *im;
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127 |
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128 | if (idx == 0)
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129 | return 0;
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130 | im = find_by_index(idx);
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131 | if (im)
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132 | return im->flags;
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133 | return 0;
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134 | }
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135 |
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136 | int FAST_FUNC xll_name_to_index(const char *name)
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137 | {
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138 | int ret = 0;
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139 | int sock_fd;
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140 |
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141 | /* caching is not warranted - no users which repeatedly call it */
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142 | #ifdef UNUSED
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143 | static char ncache[16];
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144 | static int icache;
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145 |
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146 | struct idxmap *im;
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147 | int i;
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148 |
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149 | if (name == NULL)
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150 | goto out;
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151 | if (icache && strcmp(name, ncache) == 0) {
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152 | ret = icache;
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153 | goto out;
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154 | }
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155 | if (idxmap) {
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156 | for (i = 0; i < 16; i++) {
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157 | for (im = idxmap[i]; im; im = im->next) {
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158 | if (strcmp(im->name, name) == 0) {
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159 | icache = im->index;
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160 | strcpy(ncache, name);
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161 | ret = im->index;
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162 | goto out;
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163 | }
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164 | }
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165 | }
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166 | }
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167 | /* We have not found the interface in our cache, but the kernel
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168 | * may still know about it. One reason is that we may be using
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169 | * module on-demand loading, which means that the kernel will
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170 | * load the module and make the interface exist only when
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171 | * we explicitely request it (check for dev_load() in net/core/dev.c).
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172 | * I can think of other similar scenario, but they are less common...
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173 | * Jean II */
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174 | #endif
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175 |
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176 | sock_fd = socket(AF_INET, SOCK_DGRAM, 0);
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177 | if (sock_fd >= 0) {
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178 | struct ifreq ifr;
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179 | int tmp;
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180 |
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181 | strncpy_IFNAMSIZ(ifr.ifr_name, name);
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182 | ifr.ifr_ifindex = -1;
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183 | tmp = ioctl(sock_fd, SIOCGIFINDEX, &ifr);
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184 | close(sock_fd);
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185 | if (tmp >= 0)
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186 | /* In theory, we should redump the interface list
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187 | * to update our cache, this is left as an exercise
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188 | * to the reader... Jean II */
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189 | ret = ifr.ifr_ifindex;
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190 | }
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191 | /* out:*/
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192 | if (ret <= 0)
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193 | bb_error_msg_and_die("can't find device '%s'", name);
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194 | return ret;
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195 | }
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196 |
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197 | int FAST_FUNC ll_init_map(struct rtnl_handle *rth)
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198 | {
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199 | xrtnl_wilddump_request(rth, AF_UNSPEC, RTM_GETLINK);
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200 | xrtnl_dump_filter(rth, ll_remember_index, NULL);
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201 | return 0;
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202 | }
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