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aba5acdf SH |
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 <stdlib.h> | |
15 | #include <unistd.h> | |
16 | #include <syslog.h> | |
17 | #include <fcntl.h> | |
18 | #include <sys/socket.h> | |
19 | #include <netinet/in.h> | |
99f830de | 20 | #include <net/if.h> |
aba5acdf SH |
21 | #include <string.h> |
22 | ||
23 | #include "libnetlink.h" | |
24 | #include "ll_map.h" | |
25 | ||
26 | struct idxmap | |
27 | { | |
28 | struct idxmap * next; | |
99f830de | 29 | unsigned index; |
aba5acdf SH |
30 | int type; |
31 | int alen; | |
32 | unsigned flags; | |
33 | unsigned char addr[8]; | |
34 | char name[16]; | |
35 | }; | |
36 | ||
37 | static struct idxmap *idxmap[16]; | |
38 | ||
50772dc5 SH |
39 | int ll_remember_index(const struct sockaddr_nl *who, |
40 | struct nlmsghdr *n, void *arg) | |
aba5acdf SH |
41 | { |
42 | int h; | |
43 | struct ifinfomsg *ifi = NLMSG_DATA(n); | |
44 | struct idxmap *im, **imp; | |
45 | struct rtattr *tb[IFLA_MAX+1]; | |
46 | ||
47 | if (n->nlmsg_type != RTM_NEWLINK) | |
48 | return 0; | |
49 | ||
50 | if (n->nlmsg_len < NLMSG_LENGTH(sizeof(ifi))) | |
51 | return -1; | |
52 | ||
53 | ||
54 | memset(tb, 0, sizeof(tb)); | |
55 | parse_rtattr(tb, IFLA_MAX, IFLA_RTA(ifi), IFLA_PAYLOAD(n)); | |
56 | if (tb[IFLA_IFNAME] == NULL) | |
57 | return 0; | |
58 | ||
59 | h = ifi->ifi_index&0xF; | |
60 | ||
61 | for (imp=&idxmap[h]; (im=*imp)!=NULL; imp = &im->next) | |
62 | if (im->index == ifi->ifi_index) | |
63 | break; | |
64 | ||
65 | if (im == NULL) { | |
66 | im = malloc(sizeof(*im)); | |
67 | if (im == NULL) | |
68 | return 0; | |
69 | im->next = *imp; | |
70 | im->index = ifi->ifi_index; | |
71 | *imp = im; | |
72 | } | |
73 | ||
74 | im->type = ifi->ifi_type; | |
75 | im->flags = ifi->ifi_flags; | |
76 | if (tb[IFLA_ADDRESS]) { | |
77 | int alen; | |
78 | im->alen = alen = RTA_PAYLOAD(tb[IFLA_ADDRESS]); | |
79 | if (alen > sizeof(im->addr)) | |
80 | alen = sizeof(im->addr); | |
81 | memcpy(im->addr, RTA_DATA(tb[IFLA_ADDRESS]), alen); | |
82 | } else { | |
83 | im->alen = 0; | |
84 | memset(im->addr, 0, sizeof(im->addr)); | |
85 | } | |
86 | strcpy(im->name, RTA_DATA(tb[IFLA_IFNAME])); | |
87 | return 0; | |
88 | } | |
89 | ||
99f830de | 90 | const char *ll_idx_n2a(unsigned idx, char *buf) |
aba5acdf SH |
91 | { |
92 | struct idxmap *im; | |
93 | ||
94 | if (idx == 0) | |
95 | return "*"; | |
96 | for (im = idxmap[idx&0xF]; im; im = im->next) | |
97 | if (im->index == idx) | |
98 | return im->name; | |
99 | snprintf(buf, 16, "if%d", idx); | |
100 | return buf; | |
101 | } | |
102 | ||
103 | ||
99f830de | 104 | const char *ll_index_to_name(unsigned idx) |
aba5acdf SH |
105 | { |
106 | static char nbuf[16]; | |
107 | ||
108 | return ll_idx_n2a(idx, nbuf); | |
109 | } | |
110 | ||
99f830de | 111 | int ll_index_to_type(unsigned idx) |
aba5acdf SH |
112 | { |
113 | struct idxmap *im; | |
114 | ||
115 | if (idx == 0) | |
116 | return -1; | |
117 | for (im = idxmap[idx&0xF]; im; im = im->next) | |
118 | if (im->index == idx) | |
119 | return im->type; | |
120 | return -1; | |
121 | } | |
122 | ||
99f830de | 123 | unsigned ll_index_to_flags(unsigned idx) |
aba5acdf SH |
124 | { |
125 | struct idxmap *im; | |
126 | ||
127 | if (idx == 0) | |
128 | return 0; | |
129 | ||
130 | for (im = idxmap[idx&0xF]; im; im = im->next) | |
131 | if (im->index == idx) | |
132 | return im->flags; | |
133 | return 0; | |
134 | } | |
135 | ||
99f830de | 136 | unsigned ll_name_to_index(const char *name) |
aba5acdf SH |
137 | { |
138 | static char ncache[16]; | |
139 | static int icache; | |
140 | struct idxmap *im; | |
141 | int i; | |
142 | ||
143 | if (name == NULL) | |
144 | return 0; | |
145 | if (icache && strcmp(name, ncache) == 0) | |
146 | return icache; | |
147 | for (i=0; i<16; i++) { | |
148 | for (im = idxmap[i]; im; im = im->next) { | |
149 | if (strcmp(im->name, name) == 0) { | |
150 | icache = im->index; | |
151 | strcpy(ncache, name); | |
152 | return im->index; | |
153 | } | |
154 | } | |
155 | } | |
99f830de SH |
156 | |
157 | return if_nametoindex(name); | |
aba5acdf SH |
158 | } |
159 | ||
160 | int ll_init_map(struct rtnl_handle *rth) | |
161 | { | |
162 | if (rtnl_wilddump_request(rth, AF_UNSPEC, RTM_GETLINK) < 0) { | |
163 | perror("Cannot send dump request"); | |
164 | exit(1); | |
165 | } | |
166 | ||
167 | if (rtnl_dump_filter(rth, ll_remember_index, &idxmap, NULL, NULL) < 0) { | |
168 | fprintf(stderr, "Dump terminated\n"); | |
169 | exit(1); | |
170 | } | |
171 | return 0; | |
172 | } |