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1 | /***************************************************************************** |
2 | Copyright (c) 2006 EMC Corporation. | |
3 | ||
4 | This program is free software; you can redistribute it and/or modify it | |
5 | under the terms of the GNU General Public License as published by the Free | |
6 | Software Foundation; either version 2 of the License, or (at your option) | |
7 | any later version. | |
8 | ||
9 | This program is distributed in the hope that it will be useful, but WITHOUT | |
10 | ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
12 | more details. | |
13 | ||
14 | You should have received a copy of the GNU General Public License along with | |
15 | this program; if not, write to the Free Software Foundation, Inc., 59 | |
16 | Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
17 | ||
18 | The full GNU General Public License is included in this distribution in the | |
19 | file called LICENSE. | |
20 | ||
21 | Authors: Srinivas Aji <Aji_Srinivas@emc.com> | |
22 | ||
23 | ******************************************************************************/ | |
24 | ||
25 | #include "netif_utils.h" | |
26 | ||
27 | #include <errno.h> | |
28 | #include <string.h> | |
29 | #include <stdlib.h> | |
30 | #include <unistd.h> | |
31 | #include <stdint.h> | |
32 | #include <sys/socket.h> | |
33 | #include <sys/ioctl.h> | |
34 | #include <fcntl.h> | |
35 | ||
36 | #include <net/if.h> | |
37 | #include <linux/if_ether.h> | |
38 | #include <linux/ethtool.h> | |
39 | #include <linux/sockios.h> | |
40 | ||
41 | #include "log.h" | |
42 | ||
43 | ||
44 | ||
45 | int netsock = -1; | |
46 | ||
47 | int netsock_init(void) | |
48 | { | |
49 | LOG(""); | |
50 | netsock = socket(AF_INET, SOCK_DGRAM, 0); | |
51 | if (netsock < 0) { | |
52 | ERROR("Couldn't open inet socket for ioctls: %m\n"); | |
53 | return -1; | |
54 | } | |
55 | return 0; | |
56 | } | |
57 | ||
58 | int get_hwaddr(char *ifname, unsigned char *hwaddr) | |
59 | { | |
60 | struct ifreq ifr; | |
61 | memset(&ifr, 0, sizeof(ifr)); | |
62 | strncpy(ifr.ifr_name, ifname, IFNAMSIZ); | |
63 | if (ioctl(netsock, SIOCGIFHWADDR, &ifr) < 0) { | |
64 | ERROR("%s: get hw address failed: %m", ifname); | |
65 | return -1; | |
66 | } | |
67 | memcpy(hwaddr, ifr.ifr_hwaddr.sa_data, ETH_ALEN); | |
68 | return 0; | |
69 | } | |
70 | ||
71 | int ethtool_get_speed_duplex(char *ifname, int *speed, int *duplex) | |
72 | { | |
73 | struct ifreq ifr; | |
74 | memset(&ifr, 0, sizeof(ifr)); | |
75 | strncpy(ifr.ifr_name, ifname, IFNAMSIZ); | |
76 | struct ethtool_cmd ecmd; | |
77 | ||
78 | ecmd.cmd = ETHTOOL_GSET; | |
79 | ifr.ifr_data = (caddr_t)&ecmd; | |
80 | if (ioctl(netsock, SIOCETHTOOL, &ifr) < 0) { | |
81 | ERROR("Cannot get link status for %s: %m\n", ifname); | |
82 | return -1; | |
83 | } | |
84 | *speed = ecmd.speed; /* Ethtool speed is in Mbps */ | |
85 | *duplex = ecmd.duplex; /* We have same convention as ethtool. | |
86 | 0 = half, 1 = full */ | |
87 | return 0; | |
88 | } | |
89 | ||
90 | ||
91 | /********* Sysfs based utility functions *************/ | |
92 | ||
93 | /* This sysfs stuff might break with interface renames */ | |
94 | int is_bridge(char *if_name) | |
95 | { | |
96 | char path[32 + IFNAMSIZ]; | |
97 | sprintf(path, "/sys/class/net/%s/bridge", if_name); | |
98 | return (access(path, R_OK) == 0); | |
99 | } | |
100 | ||
101 | /* This will work even less if the bridge port is renamed after being | |
102 | joined to the bridge. | |
103 | */ | |
104 | int is_bridge_slave(char *br_name, char *if_name) | |
105 | { | |
106 | char path[32 + 2 * IFNAMSIZ]; | |
107 | sprintf(path, "/sys/class/net/%s/brif/%s", br_name, if_name); | |
108 | return (access(path, R_OK) == 0); | |
109 | } | |
110 | ||
111 | int get_bridge_portno(char *if_name) | |
112 | { | |
113 | char path[32 + IFNAMSIZ]; | |
114 | sprintf(path, "/sys/class/net/%s/brport/port_no", if_name); | |
115 | char buf[128]; | |
116 | int fd; | |
117 | long res = -1; | |
118 | TSTM((fd = open(path, O_RDONLY)) >= 0, -1, "%m"); | |
119 | int l; | |
120 | TSTM((l = read(fd, buf, sizeof(buf) - 1)) >= 0, -1, "%m"); | |
121 | if (l == 0) { | |
122 | ERROR("Empty port index file"); | |
123 | goto out; | |
124 | } | |
125 | else if (l == sizeof(buf) - 1) { | |
126 | ERROR("port_index file too long"); | |
127 | goto out; | |
128 | } | |
129 | buf[l] = 0; | |
130 | if (buf[l-1] == '\n') | |
131 | buf[l-1] = 0; | |
132 | char *end; | |
133 | res = strtoul(buf, &end, 0); | |
134 | if (*end != 0 || res > INT_MAX) { | |
135 | ERROR("Invalid port index %s", buf); | |
136 | res = -1; | |
137 | } | |
138 | out: | |
139 | close(fd); | |
140 | return res; | |
141 | } |