[821] | 1 | /*
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| 2 | * ll_map.c
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| 3 | *
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| 4 | * This program is free software; you can redistribute it and/or
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| 5 | * modify it under the terms of the GNU General Public License
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| 6 | * as published by the Free Software Foundation; either version
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| 7 | * 2 of the License, or (at your option) any later version.
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| 8 | *
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| 9 | * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
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| 10 | *
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| 11 | */
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| 12 |
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| 13 | #include "libbb.h"
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| 14 | #include <string.h>
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| 15 |
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| 16 | #include "libnetlink.h"
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| 17 | #include "ll_map.h"
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| 18 |
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| 19 | struct idxmap
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| 20 | {
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| 21 | struct idxmap * next;
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| 22 | int index;
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| 23 | int type;
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| 24 | int alen;
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| 25 | unsigned flags;
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| 26 | unsigned char addr[8];
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| 27 | char name[16];
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| 28 | };
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| 29 |
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| 30 | static struct idxmap *idxmap[16];
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| 31 |
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| 32 | int ll_remember_index(struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
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| 33 | {
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| 34 | int h;
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| 35 | struct ifinfomsg *ifi = NLMSG_DATA(n);
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| 36 | struct idxmap *im, **imp;
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| 37 | struct rtattr *tb[IFLA_MAX+1];
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| 38 |
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| 39 | if (n->nlmsg_type != RTM_NEWLINK)
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| 40 | return 0;
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| 41 |
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| 42 | if (n->nlmsg_len < NLMSG_LENGTH(sizeof(ifi)))
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| 43 | return -1;
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| 44 |
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| 45 |
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| 46 | memset(tb, 0, sizeof(tb));
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| 47 | parse_rtattr(tb, IFLA_MAX, IFLA_RTA(ifi), IFLA_PAYLOAD(n));
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| 48 | if (tb[IFLA_IFNAME] == NULL)
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| 49 | return 0;
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| 50 |
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| 51 | h = ifi->ifi_index&0xF;
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| 52 |
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| 53 | for (imp=&idxmap[h]; (im=*imp)!=NULL; imp = &im->next)
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| 54 | if (im->index == ifi->ifi_index)
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| 55 | break;
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| 56 |
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| 57 | if (im == NULL) {
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| 58 | im = xmalloc(sizeof(*im));
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| 59 | im->next = *imp;
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| 60 | im->index = ifi->ifi_index;
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| 61 | *imp = im;
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| 62 | }
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| 63 |
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| 64 | im->type = ifi->ifi_type;
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| 65 | im->flags = ifi->ifi_flags;
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| 66 | if (tb[IFLA_ADDRESS]) {
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| 67 | int alen;
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| 68 | im->alen = alen = RTA_PAYLOAD(tb[IFLA_ADDRESS]);
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| 69 | if (alen > sizeof(im->addr))
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| 70 | alen = sizeof(im->addr);
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| 71 | memcpy(im->addr, RTA_DATA(tb[IFLA_ADDRESS]), alen);
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| 72 | } else {
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| 73 | im->alen = 0;
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| 74 | memset(im->addr, 0, sizeof(im->addr));
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| 75 | }
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| 76 | strcpy(im->name, RTA_DATA(tb[IFLA_IFNAME]));
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| 77 | return 0;
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| 78 | }
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| 79 |
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| 80 | const char *ll_idx_n2a(int idx, char *buf)
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| 81 | {
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| 82 | struct idxmap *im;
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| 83 |
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| 84 | if (idx == 0)
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| 85 | return "*";
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| 86 | for (im = idxmap[idx&0xF]; im; im = im->next)
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| 87 | if (im->index == idx)
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| 88 | return im->name;
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| 89 | snprintf(buf, 16, "if%d", idx);
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| 90 | return buf;
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| 91 | }
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| 92 |
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| 93 |
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| 94 | const char *ll_index_to_name(int idx)
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| 95 | {
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| 96 | static char nbuf[16];
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| 97 |
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| 98 | return ll_idx_n2a(idx, nbuf);
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| 99 | }
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| 100 |
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| 101 | int ll_index_to_type(int idx)
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| 102 | {
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| 103 | struct idxmap *im;
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| 104 |
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| 105 | if (idx == 0)
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| 106 | return -1;
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| 107 | for (im = idxmap[idx&0xF]; im; im = im->next)
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| 108 | if (im->index == idx)
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| 109 | return im->type;
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| 110 | return -1;
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| 111 | }
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| 112 |
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| 113 | unsigned ll_index_to_flags(int idx)
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| 114 | {
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| 115 | struct idxmap *im;
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| 116 |
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| 117 | if (idx == 0)
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| 118 | return 0;
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| 119 |
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| 120 | for (im = idxmap[idx&0xF]; im; im = im->next)
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| 121 | if (im->index == idx)
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| 122 | return im->flags;
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| 123 | return 0;
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| 124 | }
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| 125 |
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| 126 | int ll_name_to_index(char *name)
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| 127 | {
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| 128 | static char ncache[16];
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| 129 | static int icache;
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| 130 | struct idxmap *im;
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| 131 | int i;
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| 132 |
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| 133 | if (name == NULL)
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| 134 | return 0;
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| 135 | if (icache && strcmp(name, ncache) == 0)
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| 136 | return icache;
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| 137 | for (i=0; i<16; i++) {
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| 138 | for (im = idxmap[i]; im; im = im->next) {
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| 139 | if (strcmp(im->name, name) == 0) {
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| 140 | icache = im->index;
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| 141 | strcpy(ncache, name);
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| 142 | return im->index;
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| 143 | }
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| 144 | }
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| 145 | }
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| 146 | return 0;
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| 147 | }
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| 148 |
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| 149 | int ll_init_map(struct rtnl_handle *rth)
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| 150 | {
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| 151 | if (rtnl_wilddump_request(rth, AF_UNSPEC, RTM_GETLINK) < 0) {
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| 152 | perror("Cannot send dump request");
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| 153 | exit(1);
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| 154 | }
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| 155 |
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| 156 | if (rtnl_dump_filter(rth, ll_remember_index, &idxmap, NULL, NULL) < 0) {
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| 157 | fprintf(stderr, "Dump terminated\n");
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| 158 | exit(1);
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| 159 | }
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| 160 | return 0;
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| 161 | }
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