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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> | |
20 | #include <string.h> | |
4b3385f6 | 21 | #include <linux/if.h> |
aba5acdf SH |
22 | |
23 | #include "libnetlink.h" | |
24 | #include "ll_map.h" | |
25 | ||
dcb283c3 TG |
26 | extern unsigned int if_nametoindex (const char *); |
27 | ||
4b3385f6 | 28 | struct ll_cache |
aba5acdf | 29 | { |
4b3385f6 | 30 | struct ll_cache *idx_next; |
aba5acdf | 31 | unsigned flags; |
4b3385f6 SH |
32 | int index; |
33 | unsigned short type; | |
34 | unsigned short alen; | |
35 | char name[IFNAMSIZ]; | |
e03dcc04 | 36 | unsigned char addr[20]; |
aba5acdf SH |
37 | }; |
38 | ||
1e21ea71 | 39 | #define IDXMAP_SIZE 1024 |
4b3385f6 SH |
40 | static struct ll_cache *idx_head[IDXMAP_SIZE]; |
41 | ||
42 | static inline struct ll_cache *idxhead(int idx) | |
43 | { | |
44 | return idx_head[idx & (IDXMAP_SIZE - 1)]; | |
45 | } | |
aba5acdf | 46 | |
ae665a52 | 47 | int ll_remember_index(const struct sockaddr_nl *who, |
50772dc5 | 48 | struct nlmsghdr *n, void *arg) |
aba5acdf SH |
49 | { |
50 | int h; | |
51 | struct ifinfomsg *ifi = NLMSG_DATA(n); | |
4b3385f6 | 52 | struct ll_cache *im, **imp; |
aba5acdf SH |
53 | struct rtattr *tb[IFLA_MAX+1]; |
54 | ||
55 | if (n->nlmsg_type != RTM_NEWLINK) | |
56 | return 0; | |
57 | ||
58 | if (n->nlmsg_len < NLMSG_LENGTH(sizeof(ifi))) | |
59 | return -1; | |
60 | ||
aba5acdf SH |
61 | memset(tb, 0, sizeof(tb)); |
62 | parse_rtattr(tb, IFLA_MAX, IFLA_RTA(ifi), IFLA_PAYLOAD(n)); | |
63 | if (tb[IFLA_IFNAME] == NULL) | |
64 | return 0; | |
65 | ||
1e21ea71 | 66 | h = ifi->ifi_index & (IDXMAP_SIZE - 1); |
4b3385f6 | 67 | for (imp = &idx_head[h]; (im=*imp)!=NULL; imp = &im->idx_next) |
aba5acdf SH |
68 | if (im->index == ifi->ifi_index) |
69 | break; | |
70 | ||
71 | if (im == NULL) { | |
72 | im = malloc(sizeof(*im)); | |
73 | if (im == NULL) | |
74 | return 0; | |
4b3385f6 | 75 | im->idx_next = *imp; |
aba5acdf SH |
76 | im->index = ifi->ifi_index; |
77 | *imp = im; | |
78 | } | |
79 | ||
80 | im->type = ifi->ifi_type; | |
81 | im->flags = ifi->ifi_flags; | |
82 | if (tb[IFLA_ADDRESS]) { | |
83 | int alen; | |
84 | im->alen = alen = RTA_PAYLOAD(tb[IFLA_ADDRESS]); | |
85 | if (alen > sizeof(im->addr)) | |
86 | alen = sizeof(im->addr); | |
87 | memcpy(im->addr, RTA_DATA(tb[IFLA_ADDRESS]), alen); | |
88 | } else { | |
89 | im->alen = 0; | |
90 | memset(im->addr, 0, sizeof(im->addr)); | |
91 | } | |
92 | strcpy(im->name, RTA_DATA(tb[IFLA_IFNAME])); | |
93 | return 0; | |
94 | } | |
95 | ||
99f830de | 96 | const char *ll_idx_n2a(unsigned idx, char *buf) |
aba5acdf | 97 | { |
4b3385f6 | 98 | const struct ll_cache *im; |
aba5acdf SH |
99 | |
100 | if (idx == 0) | |
101 | return "*"; | |
1e21ea71 | 102 | |
4b3385f6 | 103 | for (im = idxhead(idx); im; im = im->idx_next) |
aba5acdf SH |
104 | if (im->index == idx) |
105 | return im->name; | |
4b3385f6 SH |
106 | |
107 | snprintf(buf, IFNAMSIZ, "if%d", idx); | |
aba5acdf SH |
108 | return buf; |
109 | } | |
110 | ||
111 | ||
99f830de | 112 | const char *ll_index_to_name(unsigned idx) |
aba5acdf | 113 | { |
4b3385f6 | 114 | static char nbuf[IFNAMSIZ]; |
aba5acdf SH |
115 | |
116 | return ll_idx_n2a(idx, nbuf); | |
117 | } | |
118 | ||
99f830de | 119 | int ll_index_to_type(unsigned idx) |
aba5acdf | 120 | { |
4b3385f6 | 121 | const struct ll_cache *im; |
aba5acdf SH |
122 | |
123 | if (idx == 0) | |
124 | return -1; | |
4b3385f6 | 125 | for (im = idxhead(idx); im; im = im->idx_next) |
aba5acdf SH |
126 | if (im->index == idx) |
127 | return im->type; | |
128 | return -1; | |
129 | } | |
130 | ||
99f830de | 131 | unsigned ll_index_to_flags(unsigned idx) |
aba5acdf | 132 | { |
4b3385f6 | 133 | const struct ll_cache *im; |
aba5acdf SH |
134 | |
135 | if (idx == 0) | |
136 | return 0; | |
137 | ||
4b3385f6 | 138 | for (im = idxhead(idx); im; im = im->idx_next) |
aba5acdf SH |
139 | if (im->index == idx) |
140 | return im->flags; | |
141 | return 0; | |
142 | } | |
143 | ||
ee7ba987 DW |
144 | unsigned ll_index_to_addr(unsigned idx, unsigned char *addr, |
145 | unsigned alen) | |
146 | { | |
4b3385f6 | 147 | const struct ll_cache *im; |
ee7ba987 DW |
148 | |
149 | if (idx == 0) | |
150 | return 0; | |
151 | ||
4b3385f6 | 152 | for (im = idxhead(idx); im; im = im->idx_next) { |
ee7ba987 DW |
153 | if (im->index == idx) { |
154 | if (alen > sizeof(im->addr)) | |
155 | alen = sizeof(im->addr); | |
156 | if (alen > im->alen) | |
157 | alen = im->alen; | |
158 | memcpy(addr, im->addr, alen); | |
159 | return alen; | |
160 | } | |
161 | } | |
162 | return 0; | |
163 | } | |
164 | ||
99f830de | 165 | unsigned ll_name_to_index(const char *name) |
aba5acdf | 166 | { |
4b3385f6 | 167 | static char ncache[IFNAMSIZ]; |
aba5acdf | 168 | static int icache; |
4b3385f6 | 169 | struct ll_cache *im; |
aba5acdf | 170 | int i; |
24abb62e | 171 | unsigned idx; |
aba5acdf SH |
172 | |
173 | if (name == NULL) | |
174 | return 0; | |
4b3385f6 | 175 | |
aba5acdf SH |
176 | if (icache && strcmp(name, ncache) == 0) |
177 | return icache; | |
4b3385f6 SH |
178 | |
179 | for (i=0; i<IDXMAP_SIZE; i++) { | |
180 | for (im = idx_head[i]; im; im = im->idx_next) { | |
aba5acdf SH |
181 | if (strcmp(im->name, name) == 0) { |
182 | icache = im->index; | |
183 | strcpy(ncache, name); | |
184 | return im->index; | |
185 | } | |
186 | } | |
187 | } | |
99f830de | 188 | |
24abb62e FW |
189 | idx = if_nametoindex(name); |
190 | if (idx == 0) | |
191 | sscanf(name, "if%u", &idx); | |
192 | return idx; | |
aba5acdf SH |
193 | } |
194 | ||
195 | int ll_init_map(struct rtnl_handle *rth) | |
196 | { | |
30564237 OP |
197 | static int initialized; |
198 | ||
199 | if (initialized) | |
200 | return 0; | |
201 | ||
aba5acdf SH |
202 | if (rtnl_wilddump_request(rth, AF_UNSPEC, RTM_GETLINK) < 0) { |
203 | perror("Cannot send dump request"); | |
204 | exit(1); | |
205 | } | |
206 | ||
4b3385f6 | 207 | if (rtnl_dump_filter(rth, ll_remember_index, NULL, NULL, NULL) < 0) { |
aba5acdf SH |
208 | fprintf(stderr, "Dump terminated\n"); |
209 | exit(1); | |
210 | } | |
30564237 OP |
211 | |
212 | initialized = 1; | |
213 | ||
aba5acdf SH |
214 | return 0; |
215 | } |