diff options
Diffstat (limited to 'net/netlabel/netlabel_mgmt.c')
| -rw-r--r-- | net/netlabel/netlabel_mgmt.c | 624 |
1 files changed, 624 insertions, 0 deletions
diff --git a/net/netlabel/netlabel_mgmt.c b/net/netlabel/netlabel_mgmt.c new file mode 100644 index 0000000..85bc11a --- /dev/null +++ b/net/netlabel/netlabel_mgmt.c @@ -0,0 +1,624 @@ +/* + * NetLabel Management Support + * + * This file defines the management functions for the NetLabel system. The + * NetLabel system manages static and dynamic label mappings for network + * protocols such as CIPSO and RIPSO. + * + * Author: Paul Moore <paul.moore@hp.com> + * + */ + +/* + * (c) Copyright Hewlett-Packard Development Company, L.P., 2006 + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See + * the GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + */ + +#include <linux/types.h> +#include <linux/socket.h> +#include <linux/string.h> +#include <linux/skbuff.h> +#include <net/sock.h> +#include <net/netlink.h> +#include <net/genetlink.h> +#include <net/netlabel.h> +#include <net/cipso_ipv4.h> + +#include "netlabel_domainhash.h" +#include "netlabel_user.h" +#include "netlabel_mgmt.h" + +/* NetLabel Generic NETLINK CIPSOv4 family */ +static struct genl_family netlbl_mgmt_gnl_family = { + .id = GENL_ID_GENERATE, + .hdrsize = 0, + .name = NETLBL_NLTYPE_MGMT_NAME, + .version = NETLBL_PROTO_VERSION, + .maxattr = 0, +}; + + +/* + * NetLabel Command Handlers + */ + +/** + * netlbl_mgmt_add - Handle an ADD message + * @skb: the NETLINK buffer + * @info: the Generic NETLINK info block + * + * Description: + * Process a user generated ADD message and add the domains from the message + * to the hash table. See netlabel.h for a description of the message format. + * Returns zero on success, negative values on failure. + * + */ +static int netlbl_mgmt_add(struct sk_buff *skb, struct genl_info *info) +{ + int ret_val = -EINVAL; + struct nlattr *msg_ptr = netlbl_netlink_payload_data(skb); + int msg_len = netlbl_netlink_payload_len(skb); + u32 count; + struct netlbl_dom_map *entry = NULL; + u32 iter; + u32 tmp_val; + int tmp_size; + + ret_val = netlbl_netlink_cap_check(skb, CAP_NET_ADMIN); + if (ret_val != 0) + goto add_failure; + + if (msg_len < NETLBL_LEN_U32) + goto add_failure; + count = netlbl_getinc_u32(&msg_ptr, &msg_len); + + for (iter = 0; iter < count && msg_len > 0; iter++, entry = NULL) { + if (msg_len <= 0) { + ret_val = -EINVAL; + goto add_failure; + } + entry = kzalloc(sizeof(*entry), GFP_KERNEL); + if (entry == NULL) { + ret_val = -ENOMEM; + goto add_failure; + } + tmp_size = nla_len(msg_ptr); + if (tmp_size <= 0 || tmp_size > msg_len) { + ret_val = -EINVAL; + goto add_failure; + } + entry->domain = kmalloc(tmp_size, GFP_KERNEL); + if (entry->domain == NULL) { + ret_val = -ENOMEM; + goto add_failure; + } + nla_strlcpy(entry->domain, msg_ptr, tmp_size); + entry->domain[tmp_size - 1] = '\0'; + msg_ptr = nla_next(msg_ptr, &msg_len); + + if (msg_len < NETLBL_LEN_U32) { + ret_val = -EINVAL; + goto add_failure; + } + tmp_val = netlbl_getinc_u32(&msg_ptr, &msg_len); + entry->type = tmp_val; + switch (tmp_val) { + case NETLBL_NLTYPE_UNLABELED: + ret_val = netlbl_domhsh_add(entry); + break; + case NETLBL_NLTYPE_CIPSOV4: + if (msg_len < NETLBL_LEN_U32) { + ret_val = -EINVAL; + goto add_failure; + } + tmp_val = netlbl_getinc_u32(&msg_ptr, &msg_len); + /* We should be holding a rcu_read_lock() here + * while we hold the result but since the entry + * will always be deleted when the CIPSO DOI + * is deleted we aren't going to keep the lock. */ + rcu_read_lock(); + entry->type_def.cipsov4 = cipso_v4_doi_getdef(tmp_val); + if (entry->type_def.cipsov4 == NULL) { + rcu_read_unlock(); + ret_val = -EINVAL; + goto add_failure; + } + ret_val = netlbl_domhsh_add(entry); + rcu_read_unlock(); + break; + default: + ret_val = -EINVAL; + } + if (ret_val != 0) + goto add_failure; + } + + netlbl_netlink_send_ack(info, + netlbl_mgmt_gnl_family.id, + NLBL_MGMT_C_ACK, + NETLBL_E_OK); + return 0; + +add_failure: + if (entry) + kfree(entry->domain); + kfree(entry); + netlbl_netlink_send_ack(info, + netlbl_mgmt_gnl_family.id, + NLBL_MGMT_C_ACK, + -ret_val); + return ret_val; +} + +/** + * netlbl_mgmt_remove - Handle a REMOVE message + * @skb: the NETLINK buffer + * @info: the Generic NETLINK info block + * + * Description: + * Process a user generated REMOVE message and remove the specified domain + * mappings. Returns zero on success, negative values on failure. + * + */ +static int netlbl_mgmt_remove(struct sk_buff *skb, struct genl_info *info) +{ + int ret_val = -EINVAL; + struct nlattr *msg_ptr = netlbl_netlink_payload_data(skb); + int msg_len = netlbl_netlink_payload_len(skb); + u32 count; + u32 iter; + int tmp_size; + unsigned char *domain; + + ret_val = netlbl_netlink_cap_check(skb, CAP_NET_ADMIN); + if (ret_val != 0) + goto remove_return; + + if (msg_len < NETLBL_LEN_U32) + goto remove_return; + count = netlbl_getinc_u32(&msg_ptr, &msg_len); + + for (iter = 0; iter < count && msg_len > 0; iter++) { + if (msg_len <= 0) { + ret_val = -EINVAL; + goto remove_return; + } + tmp_size = nla_len(msg_ptr); + domain = nla_data(msg_ptr); + if (tmp_size <= 0 || tmp_size > msg_len || + domain[tmp_size - 1] != '\0') { + ret_val = -EINVAL; + goto remove_return; + } + ret_val = netlbl_domhsh_remove(domain); + if (ret_val != 0) + goto remove_return; + msg_ptr = nla_next(msg_ptr, &msg_len); + } + + ret_val = 0; + +remove_return: + netlbl_netlink_send_ack(info, + netlbl_mgmt_gnl_family.id, + NLBL_MGMT_C_ACK, + -ret_val); + return ret_val; +} + +/** + * netlbl_mgmt_list - Handle a LIST message + * @skb: the NETLINK buffer + * @info: the Generic NETLINK info block + * + * Description: + * Process a user generated LIST message and dumps the domain hash table in a + * form suitable for use in a kernel generated LIST message. Returns zero on + * success, negative values on failure. + * + */ +static int netlbl_mgmt_list(struct sk_buff *skb, struct genl_info *info) +{ + int ret_val = -ENOMEM; + struct sk_buff *ans_skb; + + ans_skb = netlbl_domhsh_dump(NLMSG_SPACE(GENL_HDRLEN)); + if (ans_skb == NULL) + goto list_failure; + netlbl_netlink_hdr_push(ans_skb, + info->snd_pid, + 0, + netlbl_mgmt_gnl_family.id, + NLBL_MGMT_C_LIST); + + ret_val = netlbl_netlink_snd(ans_skb, info->snd_pid); + if (ret_val != 0) + goto list_failure; + + return 0; + +list_failure: + netlbl_netlink_send_ack(info, + netlbl_mgmt_gnl_family.id, + NLBL_MGMT_C_ACK, + -ret_val); + return ret_val; +} + +/** + * netlbl_mgmt_adddef - Handle an ADDDEF message + * @skb: the NETLINK buffer + * @info: the Generic NETLINK info block + * + * Description: + * Process a user generated ADDDEF message and respond accordingly. Returns + * zero on success, negative values on failure. + * + */ +static int netlbl_mgmt_adddef(struct sk_buff *skb, struct genl_info *info) +{ + int ret_val = -EINVAL; + struct nlattr *msg_ptr = netlbl_netlink_payload_data(skb); + int msg_len = netlbl_netlink_payload_len(skb); + struct netlbl_dom_map *entry = NULL; + u32 tmp_val; + + ret_val = netlbl_netlink_cap_check(skb, CAP_NET_ADMIN); + if (ret_val != 0) + goto adddef_failure; + + if (msg_len < NETLBL_LEN_U32) + goto adddef_failure; + tmp_val = netlbl_getinc_u32(&msg_ptr, &msg_len); + + entry = kzalloc(sizeof(*entry), GFP_KERNEL); + if (entry == NULL) { + ret_val = -ENOMEM; + goto adddef_failure; + } + + entry->type = tmp_val; + switch (entry->type) { + case NETLBL_NLTYPE_UNLABELED: + ret_val = netlbl_domhsh_add_default(entry); + break; + case NETLBL_NLTYPE_CIPSOV4: + if (msg_len < NETLBL_LEN_U32) { + ret_val = -EINVAL; + goto adddef_failure; + } + tmp_val = netlbl_getinc_u32(&msg_ptr, &msg_len); + /* We should be holding a rcu_read_lock here while we + * hold the result but since the entry will always be + * deleted when the CIPSO DOI is deleted we are going + * to skip the lock. */ + rcu_read_lock(); + entry->type_def.cipsov4 = cipso_v4_doi_getdef(tmp_val); + if (entry->type_def.cipsov4 == NULL) { + rcu_read_unlock(); + ret_val = -EINVAL; + goto adddef_failure; + } + ret_val = netlbl_domhsh_add_default(entry); + rcu_read_unlock(); + break; + default: + ret_val = -EINVAL; + } + if (ret_val != 0) + goto adddef_failure; + + netlbl_netlink_send_ack(info, + netlbl_mgmt_gnl_family.id, + NLBL_MGMT_C_ACK, + NETLBL_E_OK); + return 0; + +adddef_failure: + kfree(entry); + netlbl_netlink_send_ack(info, + netlbl_mgmt_gnl_family.id, + NLBL_MGMT_C_ACK, + -ret_val); + return ret_val; +} + +/** + * netlbl_mgmt_removedef - Handle a REMOVEDEF message + * @skb: the NETLINK buffer + * @info: the Generic NETLINK info block + * + * Description: + * Process a user generated REMOVEDEF message and remove the default domain + * mapping. Returns zero on success, negative values on failure. + * + */ +static int netlbl_mgmt_removedef(struct sk_buff *skb, struct genl_info *info) +{ + int ret_val; + + ret_val = netlbl_netlink_cap_check(skb, CAP_NET_ADMIN); + if (ret_val != 0) + goto removedef_return; + + ret_val = netlbl_domhsh_remove_default(); + +removedef_return: + netlbl_netlink_send_ack(info, + netlbl_mgmt_gnl_family.id, + NLBL_MGMT_C_ACK, + -ret_val); + return ret_val; +} + +/** + * netlbl_mgmt_listdef - Handle a LISTDEF message + * @skb: the NETLINK buffer + * @info: the Generic NETLINK info block + * + * Description: + * Process a user generated LISTDEF message and dumps the default domain + * mapping in a form suitable for use in a kernel generated LISTDEF message. + * Returns zero on success, negative values on failure. + * + */ +static int netlbl_mgmt_listdef(struct sk_buff *skb, struct genl_info *info) +{ + int ret_val = -ENOMEM; + struct sk_buff *ans_skb; + + ans_skb = netlbl_domhsh_dump_default(NLMSG_SPACE(GENL_HDRLEN)); + if (ans_skb == NULL) + goto listdef_failure; + netlbl_netlink_hdr_push(ans_skb, + info->snd_pid, + 0, + netlbl_mgmt_gnl_family.id, + NLBL_MGMT_C_LISTDEF); + + ret_val = netlbl_netlink_snd(ans_skb, info->snd_pid); + if (ret_val != 0) + goto listdef_failure; + + return 0; + +listdef_failure: + netlbl_netlink_send_ack(info, + netlbl_mgmt_gnl_family.id, + NLBL_MGMT_C_ACK, + -ret_val); + return ret_val; +} + +/** + * netlbl_mgmt_modules - Handle a MODULES message + * @skb: the NETLINK buffer + * @info: the Generic NETLINK info block + * + * Description: + * Process a user generated MODULES message and respond accordingly. + * + */ +static int netlbl_mgmt_modules(struct sk_buff *skb, struct genl_info *info) +{ + int ret_val = -ENOMEM; + size_t data_size; + u32 mod_count; + struct sk_buff *ans_skb = NULL; + + /* unlabeled + cipsov4 */ + mod_count = 2; + + data_size = GENL_HDRLEN + NETLBL_LEN_U32 + mod_count * NETLBL_LEN_U32; + ans_skb = netlbl_netlink_alloc_skb(0, data_size, GFP_KERNEL); + if (ans_skb == NULL) + goto modules_failure; + + if (netlbl_netlink_hdr_put(ans_skb, + info->snd_pid, + 0, + netlbl_mgmt_gnl_family.id, + NLBL_MGMT_C_MODULES) == NULL) + goto modules_failure; + + ret_val = nla_put_u32(ans_skb, NLA_U32, mod_count); + if (ret_val != 0) + goto modules_failure; + ret_val = nla_put_u32(ans_skb, NLA_U32, NETLBL_NLTYPE_UNLABELED); + if (ret_val != 0) + goto modules_failure; + ret_val = nla_put_u32(ans_skb, NLA_U32, NETLBL_NLTYPE_CIPSOV4); + if (ret_val != 0) + goto modules_failure; + + ret_val = netlbl_netlink_snd(ans_skb, info->snd_pid); + if (ret_val != 0) + goto modules_failure; + + return 0; + +modules_failure: + kfree_skb(ans_skb); + netlbl_netlink_send_ack(info, + netlbl_mgmt_gnl_family.id, + NLBL_MGMT_C_ACK, + -ret_val); + return ret_val; +} + +/** + * netlbl_mgmt_version - Handle a VERSION message + * @skb: the NETLINK buffer + * @info: the Generic NETLINK info block + * + * Description: + * Process a user generated VERSION message and respond accordingly. Returns + * zero on success, negative values on failure. + * + */ +static int netlbl_mgmt_version(struct sk_buff *skb, struct genl_info *info) +{ + int ret_val = -ENOMEM; + struct sk_buff *ans_skb = NULL; + + ans_skb = netlbl_netlink_alloc_skb(0, + GENL_HDRLEN + NETLBL_LEN_U32, + GFP_KERNEL); + if (ans_skb == NULL) + goto version_failure; + if (netlbl_netlink_hdr_put(ans_skb, + info->snd_pid, + 0, + netlbl_mgmt_gnl_family.id, + NLBL_MGMT_C_VERSION) == NULL) + goto version_failure; + + ret_val = nla_put_u32(ans_skb, NLA_U32, NETLBL_PROTO_VERSION); + if (ret_val != 0) + goto version_failure; + + ret_val = netlbl_netlink_snd(ans_skb, info->snd_pid); + if (ret_val != 0) + goto version_failure; + + return 0; + +version_failure: + kfree_skb(ans_skb); + netlbl_netlink_send_ack(info, + netlbl_mgmt_gnl_family.id, + NLBL_MGMT_C_ACK, + -ret_val); + return ret_val; +} + + +/* + * NetLabel Generic NETLINK Command Definitions + */ + +static struct genl_ops netlbl_mgmt_genl_c_add = { + .cmd = NLBL_MGMT_C_ADD, + .flags = 0, + .doit = netlbl_mgmt_add, + .dumpit = NULL, +}; + +static struct genl_ops netlbl_mgmt_genl_c_remove = { + .cmd = NLBL_MGMT_C_REMOVE, + .flags = 0, + .doit = netlbl_mgmt_remove, + .dumpit = NULL, +}; + +static struct genl_ops netlbl_mgmt_genl_c_list = { + .cmd = NLBL_MGMT_C_LIST, + .flags = 0, + .doit = netlbl_mgmt_list, + .dumpit = NULL, +}; + +static struct genl_ops netlbl_mgmt_genl_c_adddef = { + .cmd = NLBL_MGMT_C_ADDDEF, + .flags = 0, + .doit = netlbl_mgmt_adddef, + .dumpit = NULL, +}; + +static struct genl_ops netlbl_mgmt_genl_c_removedef = { + .cmd = NLBL_MGMT_C_REMOVEDEF, + .flags = 0, + .doit = netlbl_mgmt_removedef, + .dumpit = NULL, +}; + +static struct genl_ops netlbl_mgmt_genl_c_listdef = { + .cmd = NLBL_MGMT_C_LISTDEF, + .flags = 0, + .doit = netlbl_mgmt_listdef, + .dumpit = NULL, +}; + +static struct genl_ops netlbl_mgmt_genl_c_modules = { + .cmd = NLBL_MGMT_C_MODULES, + .flags = 0, + .doit = netlbl_mgmt_modules, + .dumpit = NULL, +}; + +static struct genl_ops netlbl_mgmt_genl_c_version = { + .cmd = NLBL_MGMT_C_VERSION, + .flags = 0, + .doit = netlbl_mgmt_version, + .dumpit = NULL, +}; + +/* + * NetLabel Generic NETLINK Protocol Functions + */ + +/** + * netlbl_mgmt_genl_init - Register the NetLabel management component + * + * Description: + * Register the NetLabel management component with the Generic NETLINK + * mechanism. Returns zero on success, negative values on failure. + * + */ +int netlbl_mgmt_genl_init(void) +{ + int ret_val; + + ret_val = genl_register_family(&netlbl_mgmt_gnl_family); + if (ret_val != 0) + return ret_val; + + ret_val = genl_register_ops(&netlbl_mgmt_gnl_family, + &netlbl_mgmt_genl_c_add); + if (ret_val != 0) + return ret_val; + ret_val = genl_register_ops(&netlbl_mgmt_gnl_family, + &netlbl_mgmt_genl_c_remove); + if (ret_val != 0) + return ret_val; + ret_val = genl_register_ops(&netlbl_mgmt_gnl_family, + &netlbl_mgmt_genl_c_list); + if (ret_val != 0) + return ret_val; + ret_val = genl_register_ops(&netlbl_mgmt_gnl_family, + &netlbl_mgmt_genl_c_adddef); + if (ret_val != 0) + return ret_val; + ret_val = genl_register_ops(&netlbl_mgmt_gnl_family, + &netlbl_mgmt_genl_c_removedef); + if (ret_val != 0) + return ret_val; + ret_val = genl_register_ops(&netlbl_mgmt_gnl_family, + &netlbl_mgmt_genl_c_listdef); + if (ret_val != 0) + return ret_val; + ret_val = genl_register_ops(&netlbl_mgmt_gnl_family, + &netlbl_mgmt_genl_c_modules); + if (ret_val != 0) + return ret_val; + ret_val = genl_register_ops(&netlbl_mgmt_gnl_family, + &netlbl_mgmt_genl_c_version); + if (ret_val != 0) + return ret_val; + + return 0; +} |