projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| d15c345f PM |
1 | /* |
| 2 | * NetLabel NETLINK Interface | |
| 3 | * | |
| 4 | * This file defines the NETLINK interface for the NetLabel system. The | |
| 5 | * NetLabel system manages static and dynamic label mappings for network | |
| 6 | * protocols such as CIPSO and RIPSO. | |
| 7 | * | |
| 8 | * Author: Paul Moore <paul.moore@hp.com> | |
| 9 | * | |
| 10 | */ | |
| 11 | ||
| 12 | /* | |
| 13 | * (c) Copyright Hewlett-Packard Development Company, L.P., 2006 | |
| 14 | * | |
| 15 | * This program is free software; you can redistribute it and/or modify | |
| 16 | * it under the terms of the GNU General Public License as published by | |
| 17 | * the Free Software Foundation; either version 2 of the License, or | |
| 18 | * (at your option) any later version. | |
| 19 | * | |
| 20 | * This program is distributed in the hope that it will be useful, | |
| 21 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 22 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See | |
| 23 | * the GNU General Public License for more details. | |
| 24 | * | |
| 25 | * You should have received a copy of the GNU General Public License | |
| 26 | * along with this program; if not, write to the Free Software | |
| 27 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
| 28 | * | |
| 29 | */ | |
| 30 | ||
| 31 | #include <linux/init.h> | |
| 32 | #include <linux/types.h> | |
| 33 | #include <linux/list.h> | |
| 34 | #include <linux/socket.h> | |
| 35 | #include <net/sock.h> | |
| 36 | #include <net/netlink.h> | |
| 37 | #include <net/genetlink.h> | |
| 38 | #include <net/netlabel.h> | |
| 39 | #include <asm/bug.h> | |
| 40 | ||
| 41 | #include "netlabel_mgmt.h" | |
| 42 | #include "netlabel_unlabeled.h" | |
| 43 | #include "netlabel_cipso_v4.h" | |
| 44 | #include "netlabel_user.h" | |
| 45 | ||
| 46 | /* | |
| 47 | * NetLabel NETLINK Setup Functions | |
| 48 | */ | |
| 49 | ||
| 50 | /** | |
| 51 | * netlbl_netlink_init - Initialize the NETLINK communication channel | |
| 52 | * | |
| 53 | * Description: | |
| 54 | * Call out to the NetLabel components so they can register their families and | |
| 55 | * commands with the Generic NETLINK mechanism. Returns zero on success and | |
| 56 | * non-zero on failure. | |
| 57 | * | |
| 58 | */ | |
| 59 | int netlbl_netlink_init(void) | |
| 60 | { | |
| 61 | int ret_val; | |
| 62 | ||
| 63 | ret_val = netlbl_mgmt_genl_init(); | |
| 64 | if (ret_val != 0) | |
| 65 | return ret_val; | |
| 66 | ||
| 67 | ret_val = netlbl_cipsov4_genl_init(); | |
| 68 | if (ret_val != 0) | |
| 69 | return ret_val; | |
| 70 | ||
| 71 | ret_val = netlbl_unlabel_genl_init(); | |
| 72 | if (ret_val != 0) | |
| 73 | return ret_val; | |
| 74 | ||
| 75 | return 0; | |
| 76 | } | |
| 77 | ||
| 78 | /* | |
| 79 | * NetLabel Common Protocol Functions | |
| 80 | */ | |
| 81 | ||
| 82 | /** | |
| 83 | * netlbl_netlink_send_ack - Send an ACK message | |
| 84 | * @info: the generic NETLINK information | |
| 85 | * @genl_family: the generic NETLINK family ID value | |
| 86 | * @ack_cmd: the generic NETLINK family ACK command value | |
| 87 | * @ret_code: return code to use | |
| 88 | * | |
| 89 | * Description: | |
| 90 | * This function sends an ACK message to the sender of the NETLINK message | |
| 91 | * specified by @info. | |
| 92 | * | |
| 93 | */ | |
| 94 | void netlbl_netlink_send_ack(const struct genl_info *info, | |
| 95 | u32 genl_family, | |
| 96 | u8 ack_cmd, | |
| 97 | u32 ret_code) | |
| 98 | { | |
| 99 | size_t data_size; | |
| 100 | struct sk_buff *skb; | |
| 101 | ||
| 102 | data_size = GENL_HDRLEN + 2 * NETLBL_LEN_U32; | |
| 103 | skb = netlbl_netlink_alloc_skb(0, data_size, GFP_KERNEL); | |
| 104 | if (skb == NULL) | |
| 105 | return; | |
| 106 | ||
| 107 | if (netlbl_netlink_hdr_put(skb, | |
| 108 | info->snd_pid, | |
| 109 | 0, | |
| 110 | genl_family, | |
| 111 | ack_cmd) == NULL) | |
| 112 | goto send_ack_failure; | |
| 113 | ||
| 114 | if (nla_put_u32(skb, NLA_U32, info->snd_seq) != 0) | |
| 115 | goto send_ack_failure; | |
| 116 | if (nla_put_u32(skb, NLA_U32, ret_code) != 0) | |
| 117 | goto send_ack_failure; | |
| 118 | ||
| 119 | netlbl_netlink_snd(skb, info->snd_pid); | |
| 120 | return; | |
| 121 | ||
| 122 | send_ack_failure: | |
| 123 | kfree_skb(skb); | |
| 124 | } | |
| 125 | ||
| 126 | /* | |
| 127 | * NETLINK I/O Functions | |
| 128 | */ | |
| 129 | ||
| 130 | /** | |
| 131 | * netlbl_netlink_snd - Send a NetLabel message | |
| 132 | * @skb: NetLabel message | |
| 133 | * @pid: destination PID | |
| 134 | * | |
| 135 | * Description: | |
| 136 | * Sends a unicast NetLabel message over the NETLINK socket. | |
| 137 | * | |
| 138 | */ | |
| 139 | int netlbl_netlink_snd(struct sk_buff *skb, u32 pid) | |
| 140 | { | |
| 141 | return genlmsg_unicast(skb, pid); | |
| 142 | } | |
| 143 | ||
| 144 | /** | |
| 145 | * netlbl_netlink_snd - Send a NetLabel message | |
| 146 | * @skb: NetLabel message | |
| 147 | * @pid: sending PID | |
| 148 | * @group: multicast group id | |
| 149 | * | |
| 150 | * Description: | |
| 151 | * Sends a multicast NetLabel message over the NETLINK socket to all members | |
| 152 | * of @group except @pid. | |
| 153 | * | |
| 154 | */ | |
| 155 | int netlbl_netlink_snd_multicast(struct sk_buff *skb, u32 pid, u32 group) | |
| 156 | { | |
| 157 | return genlmsg_multicast(skb, pid, group); | |
| 158 | } |