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0ad19a3f | 1 | /* |
2 | * lxc: linux Container library | |
3 | * | |
4 | * (C) Copyright IBM Corp. 2007, 2008 | |
5 | * | |
6 | * Authors: | |
9afe19d6 | 7 | * Daniel Lezcano <daniel.lezcano at free.fr> |
0ad19a3f | 8 | * |
9 | * This library is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU Lesser General Public | |
11 | * License as published by the Free Software Foundation; either | |
12 | * version 2.1 of the License, or (at your option) any later version. | |
13 | * | |
14 | * This library is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
17 | * Lesser General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU Lesser General Public | |
20 | * License along with this library; if not, write to the Free Software | |
250b1eec | 21 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
0ad19a3f | 22 | */ |
23 | #include <string.h> | |
24 | #include <stdio.h> | |
25 | #include <sys/socket.h> | |
26 | #include <stdlib.h> | |
27 | #include <errno.h> | |
28 | #include <unistd.h> | |
29 | #include <linux/genetlink.h> | |
30 | #include <linux/rtnetlink.h> | |
f549edcc GK |
31 | |
32 | #include "nl.h" | |
33 | #include "genl.h" | |
0ad19a3f | 34 | |
35 | static int genetlink_resolve_family(const char *family) | |
36 | { | |
37 | struct nl_handler handler; | |
38 | struct nlattr *attr; | |
39 | struct genlmsg *request, *reply; | |
40 | struct genlmsghdr *genlmsghdr; | |
41 | ||
42 | int len, ret; | |
43 | ||
44 | request = genlmsg_alloc(GENLMSG_GOOD_SIZE); | |
45 | if (!request) | |
46 | return -ENOMEM; | |
47 | ||
48 | reply = genlmsg_alloc(GENLMSG_GOOD_SIZE); | |
49 | if (!reply) { | |
50 | genlmsg_free(request); | |
51 | return -ENOMEM; | |
52 | } | |
53 | ||
54 | request->nlmsghdr.nlmsg_len = NLMSG_LENGTH(GENL_HDRLEN); | |
55 | request->nlmsghdr.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK; | |
56 | request->nlmsghdr.nlmsg_type = GENL_ID_CTRL; | |
57 | ||
58 | genlmsghdr = NLMSG_DATA(&request->nlmsghdr); | |
59 | genlmsghdr->cmd = CTRL_CMD_GETFAMILY; | |
60 | ||
61 | ret = netlink_open(&handler, NETLINK_GENERIC); | |
62 | if (ret) | |
a6537fbb | 63 | goto out; |
0ad19a3f | 64 | |
f79d43bb | 65 | ret = nla_put_string((struct nlmsg *)&request->nlmsghdr, |
0ad19a3f | 66 | CTRL_ATTR_FAMILY_NAME, family); |
67 | if (ret) | |
a6537fbb | 68 | goto out_close; |
0ad19a3f | 69 | |
70 | ret = netlink_transaction(&handler, (struct nlmsg *)&request->nlmsghdr, | |
71 | (struct nlmsg *)&reply->nlmsghdr); | |
72 | if (ret < 0) | |
a6537fbb | 73 | goto out_close; |
0ad19a3f | 74 | |
75 | genlmsghdr = NLMSG_DATA(&reply->nlmsghdr); | |
76 | len = reply->nlmsghdr.nlmsg_len; | |
77 | ||
78 | ret = -ENOMSG; | |
79 | if (reply->nlmsghdr.nlmsg_type != GENL_ID_CTRL) | |
a6537fbb | 80 | goto out_close; |
0ad19a3f | 81 | |
82 | if (genlmsghdr->cmd != CTRL_CMD_NEWFAMILY) | |
a6537fbb | 83 | goto out_close; |
0ad19a3f | 84 | |
85 | ret = -EMSGSIZE; | |
86 | len -= NLMSG_LENGTH(GENL_HDRLEN); | |
87 | if (len < 0) | |
a6537fbb | 88 | goto out_close; |
0ad19a3f | 89 | |
90 | attr = (struct nlattr *)GENLMSG_DATA(reply); | |
91 | attr = (struct nlattr *)((char *)attr + NLA_ALIGN(attr->nla_len)); | |
92 | ||
93 | ret = -ENOMSG; | |
94 | if (attr->nla_type != CTRL_ATTR_FAMILY_ID) | |
a6537fbb | 95 | goto out_close; |
0ad19a3f | 96 | |
97 | ret = *(__u16 *) NLA_DATA(attr); | |
a6537fbb SH |
98 | out_close: |
99 | netlink_close(&handler); | |
0ad19a3f | 100 | out: |
101 | genlmsg_free(request); | |
102 | genlmsg_free(reply); | |
0ad19a3f | 103 | return ret; |
104 | } | |
105 | ||
106 | extern int genetlink_open(struct genl_handler *handler, const char *family) | |
107 | { | |
108 | int ret; | |
109 | handler->family = genetlink_resolve_family(family); | |
110 | if (handler->family < 0) | |
111 | return handler->family; | |
112 | ||
113 | ret = netlink_open(&handler->nlh, NETLINK_GENERIC); | |
114 | ||
115 | return ret; | |
116 | } | |
117 | ||
118 | extern int genetlink_close(struct genl_handler *handler) | |
119 | { | |
120 | return netlink_close(&handler->nlh); | |
121 | } | |
122 | ||
123 | extern int genetlink_rcv(struct genl_handler *handler, struct genlmsg *genlmsg) | |
124 | { | |
125 | return netlink_rcv(&handler->nlh, (struct nlmsg *)&genlmsg->nlmsghdr); | |
126 | } | |
127 | ||
128 | extern int genetlink_send(struct genl_handler *handler, struct genlmsg *genlmsg) | |
129 | { | |
130 | ||
131 | return netlink_send(&handler->nlh, (struct nlmsg *)&genlmsg->nlmsghdr); | |
132 | } | |
133 | ||
f79d43bb | 134 | extern int genetlink_transaction(struct genl_handler *handler, |
0ad19a3f | 135 | struct genlmsg *request, struct genlmsg *answer) |
136 | { | |
137 | return netlink_transaction(&handler->nlh, (struct nlmsg *)&request->nlmsghdr, | |
138 | (struct nlmsg *)&answer->nlmsghdr); | |
139 | } | |
140 | ||
141 | extern struct genlmsg *genlmsg_alloc(size_t size) | |
142 | { | |
143 | size_t len = NLMSG_LENGTH(GENL_HDRLEN) + size; | |
144 | return (struct genlmsg *)nlmsg_alloc(len); | |
145 | } | |
146 | ||
147 | extern void genlmsg_free(struct genlmsg *genlmsg) | |
148 | { | |
149 | free(genlmsg); | |
150 | } |