networking/libiproute/ll_map.c

   1 /*
   2  * ll_map.c
   3  *
   4  *              This program is free software; you can redistribute it and/or
   5  *              modify it under the terms of the GNU General Public License
   6  *              as published by the Free Software Foundation; either version
   7  *              2 of the License, or (at your option) any later version.
   8  *
   9  * Authors:     Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
  10  *
  11  */
  12
  13 #include <stdio.h>
  14 #include <string.h>
  15 #include <stdlib.h>
  16 #include <netinet/in.h>
  17
  18 #include "libnetlink.h"
  19 #include "ll_map.h"
  20
  21 struct idxmap
  22 {
  23         struct idxmap * next;
  24         int             index;
  25         int             type;
  26         int             alen;
  27         unsigned        flags;
  28         unsigned char   addr[8];
  29         char            name[16];
  30 };
  31
  32 static struct idxmap *idxmap[16];
  33
  34 int ll_remember_index(struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
  35 {
  36         int h;
  37         struct ifinfomsg *ifi = NLMSG_DATA(n);
  38         struct idxmap *im, **imp;
  39         struct rtattr *tb[IFLA_MAX+1];
  40
  41         if (n->nlmsg_type != RTM_NEWLINK)
  42                 return 0;
  43
  44         if (n->nlmsg_len < NLMSG_LENGTH(sizeof(ifi)))
  45                 return -1;
  46
  47
  48         memset(tb, 0, sizeof(tb));
  49         parse_rtattr(tb, IFLA_MAX, IFLA_RTA(ifi), IFLA_PAYLOAD(n));
  50         if (tb[IFLA_IFNAME] == NULL)
  51                 return 0;
  52
  53         h = ifi->ifi_index&0xF;
  54
  55         for (imp=&idxmap[h]; (im=*imp)!=NULL; imp = &im->next)
  56                 if (im->index == ifi->ifi_index)
  57                         break;
  58
  59         if (im == NULL) {
  60                 im = malloc(sizeof(*im));
  61                 if (im == NULL)
  62                         return 0;
  63                 im->next = *imp;
  64                 im->index = ifi->ifi_index;
  65                 *imp = im;
  66         }
  67
  68         im->type = ifi->ifi_type;
  69         im->flags = ifi->ifi_flags;
  70         if (tb[IFLA_ADDRESS]) {
  71                 int alen;
  72                 im->alen = alen = RTA_PAYLOAD(tb[IFLA_ADDRESS]);
  73                 if (alen > sizeof(im->addr))
  74                         alen = sizeof(im->addr);
  75                 memcpy(im->addr, RTA_DATA(tb[IFLA_ADDRESS]), alen);
  76         } else {
  77                 im->alen = 0;
  78                 memset(im->addr, 0, sizeof(im->addr));
  79         }
  80         strcpy(im->name, RTA_DATA(tb[IFLA_IFNAME]));
  81         return 0;
  82 }
  83
  84 const char *ll_idx_n2a(int idx, char *buf)
  85 {
  86         struct idxmap *im;
  87
  88         if (idx == 0)
  89                 return "*";
  90         for (im = idxmap[idx&0xF]; im; im = im->next)
  91                 if (im->index == idx)
  92                         return im->name;
  93         snprintf(buf, 16, "if%d", idx);
  94         return buf;
  95 }
  96
  97
  98 const char *ll_index_to_name(int idx)
  99 {
 100         static char nbuf[16];
 101
 102         return ll_idx_n2a(idx, nbuf);
 103 }
 104
 105 int ll_index_to_type(int idx)
 106 {
 107         struct idxmap *im;
 108
 109         if (idx == 0)
 110                 return -1;
 111         for (im = idxmap[idx&0xF]; im; im = im->next)
 112                 if (im->index == idx)
 113                         return im->type;
 114         return -1;
 115 }
 116
 117 unsigned ll_index_to_flags(int idx)
 118 {
 119         struct idxmap *im;
 120
 121         if (idx == 0)
 122                 return 0;
 123
 124         for (im = idxmap[idx&0xF]; im; im = im->next)
 125                 if (im->index == idx)
 126                         return im->flags;
 127         return 0;
 128 }
 129
 130 int ll_name_to_index(char *name)
 131 {
 132         static char ncache[16];
 133         static int icache;
 134         struct idxmap *im;
 135         int i;
 136
 137         if (name == NULL)
 138                 return 0;
 139         if (icache && strcmp(name, ncache) == 0)
 140                 return icache;
 141         for (i=0; i<16; i++) {
 142                 for (im = idxmap[i]; im; im = im->next) {
 143                         if (strcmp(im->name, name) == 0) {
 144                                 icache = im->index;
 145                                 strcpy(ncache, name);
 146                                 return im->index;
 147                         }
 148                 }
 149         }
 150         return 0;
 151 }
 152
 153 int ll_init_map(struct rtnl_handle *rth)
 154 {
 155         if (rtnl_wilddump_request(rth, AF_UNSPEC, RTM_GETLINK) < 0) {
 156                 perror("Cannot send dump request");
 157                 exit(1);
 158         }
 159
 160         if (rtnl_dump_filter(rth, ll_remember_index, &idxmap, NULL, NULL) < 0) {
 161                 fprintf(stderr, "Dump terminated\n");
 162                 exit(1);
 163         }
 164         return 0;
 165 }