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