635 строки
16 KiB
C
635 строки
16 KiB
C
/*
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* NetLabel Management Support
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*
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* This file defines the management functions for the NetLabel system. The
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* NetLabel system manages static and dynamic label mappings for network
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* protocols such as CIPSO and RIPSO.
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*
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* Author: Paul Moore <paul.moore@hp.com>
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*
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*/
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/*
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* (c) Copyright Hewlett-Packard Development Company, L.P., 2006
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <linux/types.h>
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#include <linux/socket.h>
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#include <linux/string.h>
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#include <linux/skbuff.h>
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#include <net/sock.h>
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#include <net/netlink.h>
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#include <net/genetlink.h>
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#include <net/netlabel.h>
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#include <net/cipso_ipv4.h>
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#include "netlabel_domainhash.h"
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#include "netlabel_user.h"
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#include "netlabel_mgmt.h"
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/* Argument struct for netlbl_domhsh_walk() */
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struct netlbl_domhsh_walk_arg {
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struct netlink_callback *nl_cb;
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struct sk_buff *skb;
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u32 seq;
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};
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/* NetLabel Generic NETLINK CIPSOv4 family */
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static struct genl_family netlbl_mgmt_gnl_family = {
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.id = GENL_ID_GENERATE,
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.hdrsize = 0,
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.name = NETLBL_NLTYPE_MGMT_NAME,
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.version = NETLBL_PROTO_VERSION,
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.maxattr = NLBL_MGMT_A_MAX,
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};
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/* NetLabel Netlink attribute policy */
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static const struct nla_policy netlbl_mgmt_genl_policy[NLBL_MGMT_A_MAX + 1] = {
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[NLBL_MGMT_A_DOMAIN] = { .type = NLA_NUL_STRING },
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[NLBL_MGMT_A_PROTOCOL] = { .type = NLA_U32 },
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[NLBL_MGMT_A_VERSION] = { .type = NLA_U32 },
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[NLBL_MGMT_A_CV4DOI] = { .type = NLA_U32 },
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};
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/*
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* NetLabel Command Handlers
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*/
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/**
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* netlbl_mgmt_add - Handle an ADD message
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* @skb: the NETLINK buffer
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* @info: the Generic NETLINK info block
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*
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* Description:
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* Process a user generated ADD message and add the domains from the message
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* to the hash table. See netlabel.h for a description of the message format.
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* Returns zero on success, negative values on failure.
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*
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*/
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static int netlbl_mgmt_add(struct sk_buff *skb, struct genl_info *info)
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{
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int ret_val = -EINVAL;
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struct netlbl_dom_map *entry = NULL;
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size_t tmp_size;
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u32 tmp_val;
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struct netlbl_audit audit_info;
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if (!info->attrs[NLBL_MGMT_A_DOMAIN] ||
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!info->attrs[NLBL_MGMT_A_PROTOCOL])
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goto add_failure;
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netlbl_netlink_auditinfo(skb, &audit_info);
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entry = kzalloc(sizeof(*entry), GFP_KERNEL);
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if (entry == NULL) {
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ret_val = -ENOMEM;
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goto add_failure;
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}
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tmp_size = nla_len(info->attrs[NLBL_MGMT_A_DOMAIN]);
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entry->domain = kmalloc(tmp_size, GFP_KERNEL);
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if (entry->domain == NULL) {
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ret_val = -ENOMEM;
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goto add_failure;
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}
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entry->type = nla_get_u32(info->attrs[NLBL_MGMT_A_PROTOCOL]);
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nla_strlcpy(entry->domain, info->attrs[NLBL_MGMT_A_DOMAIN], tmp_size);
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switch (entry->type) {
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case NETLBL_NLTYPE_UNLABELED:
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ret_val = netlbl_domhsh_add(entry, &audit_info);
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break;
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case NETLBL_NLTYPE_CIPSOV4:
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if (!info->attrs[NLBL_MGMT_A_CV4DOI])
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goto add_failure;
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tmp_val = nla_get_u32(info->attrs[NLBL_MGMT_A_CV4DOI]);
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/* We should be holding a rcu_read_lock() here while we hold
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* the result but since the entry will always be deleted when
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* the CIPSO DOI is deleted we aren't going to keep the
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* lock. */
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rcu_read_lock();
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entry->type_def.cipsov4 = cipso_v4_doi_getdef(tmp_val);
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if (entry->type_def.cipsov4 == NULL) {
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rcu_read_unlock();
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goto add_failure;
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}
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ret_val = netlbl_domhsh_add(entry, &audit_info);
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rcu_read_unlock();
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break;
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default:
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goto add_failure;
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}
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if (ret_val != 0)
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goto add_failure;
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return 0;
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add_failure:
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if (entry)
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kfree(entry->domain);
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kfree(entry);
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return ret_val;
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}
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/**
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* netlbl_mgmt_remove - Handle a REMOVE message
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* @skb: the NETLINK buffer
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* @info: the Generic NETLINK info block
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*
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* Description:
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* Process a user generated REMOVE message and remove the specified domain
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* mappings. Returns zero on success, negative values on failure.
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*
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*/
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static int netlbl_mgmt_remove(struct sk_buff *skb, struct genl_info *info)
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{
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char *domain;
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struct netlbl_audit audit_info;
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if (!info->attrs[NLBL_MGMT_A_DOMAIN])
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return -EINVAL;
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netlbl_netlink_auditinfo(skb, &audit_info);
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domain = nla_data(info->attrs[NLBL_MGMT_A_DOMAIN]);
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return netlbl_domhsh_remove(domain, &audit_info);
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}
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/**
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* netlbl_mgmt_listall_cb - netlbl_domhsh_walk() callback for LISTALL
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* @entry: the domain mapping hash table entry
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* @arg: the netlbl_domhsh_walk_arg structure
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*
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* Description:
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* This function is designed to be used as a callback to the
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* netlbl_domhsh_walk() function for use in generating a response for a LISTALL
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* message. Returns the size of the message on success, negative values on
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* failure.
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*
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*/
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static int netlbl_mgmt_listall_cb(struct netlbl_dom_map *entry, void *arg)
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{
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int ret_val = -ENOMEM;
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struct netlbl_domhsh_walk_arg *cb_arg = arg;
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void *data;
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data = genlmsg_put(cb_arg->skb, NETLINK_CB(cb_arg->nl_cb->skb).pid,
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cb_arg->seq, &netlbl_mgmt_gnl_family,
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NLM_F_MULTI, NLBL_MGMT_C_LISTALL);
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if (data == NULL)
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goto listall_cb_failure;
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ret_val = nla_put_string(cb_arg->skb,
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NLBL_MGMT_A_DOMAIN,
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entry->domain);
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if (ret_val != 0)
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goto listall_cb_failure;
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ret_val = nla_put_u32(cb_arg->skb, NLBL_MGMT_A_PROTOCOL, entry->type);
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if (ret_val != 0)
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goto listall_cb_failure;
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switch (entry->type) {
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case NETLBL_NLTYPE_CIPSOV4:
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ret_val = nla_put_u32(cb_arg->skb,
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NLBL_MGMT_A_CV4DOI,
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entry->type_def.cipsov4->doi);
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if (ret_val != 0)
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goto listall_cb_failure;
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break;
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}
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cb_arg->seq++;
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return genlmsg_end(cb_arg->skb, data);
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listall_cb_failure:
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genlmsg_cancel(cb_arg->skb, data);
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return ret_val;
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}
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/**
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* netlbl_mgmt_listall - Handle a LISTALL message
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* @skb: the NETLINK buffer
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* @cb: the NETLINK callback
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*
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* Description:
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* Process a user generated LISTALL message and dumps the domain hash table in
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* a form suitable for use in a kernel generated LISTALL message. Returns zero
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* on success, negative values on failure.
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*
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*/
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static int netlbl_mgmt_listall(struct sk_buff *skb,
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struct netlink_callback *cb)
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{
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struct netlbl_domhsh_walk_arg cb_arg;
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u32 skip_bkt = cb->args[0];
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u32 skip_chain = cb->args[1];
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cb_arg.nl_cb = cb;
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cb_arg.skb = skb;
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cb_arg.seq = cb->nlh->nlmsg_seq;
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netlbl_domhsh_walk(&skip_bkt,
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&skip_chain,
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netlbl_mgmt_listall_cb,
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&cb_arg);
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cb->args[0] = skip_bkt;
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cb->args[1] = skip_chain;
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return skb->len;
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}
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/**
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* netlbl_mgmt_adddef - Handle an ADDDEF message
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* @skb: the NETLINK buffer
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* @info: the Generic NETLINK info block
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*
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* Description:
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* Process a user generated ADDDEF message and respond accordingly. Returns
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* zero on success, negative values on failure.
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*
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*/
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static int netlbl_mgmt_adddef(struct sk_buff *skb, struct genl_info *info)
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{
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int ret_val = -EINVAL;
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struct netlbl_dom_map *entry = NULL;
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u32 tmp_val;
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struct netlbl_audit audit_info;
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if (!info->attrs[NLBL_MGMT_A_PROTOCOL])
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goto adddef_failure;
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netlbl_netlink_auditinfo(skb, &audit_info);
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entry = kzalloc(sizeof(*entry), GFP_KERNEL);
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if (entry == NULL) {
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ret_val = -ENOMEM;
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goto adddef_failure;
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}
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entry->type = nla_get_u32(info->attrs[NLBL_MGMT_A_PROTOCOL]);
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switch (entry->type) {
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case NETLBL_NLTYPE_UNLABELED:
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ret_val = netlbl_domhsh_add_default(entry, &audit_info);
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break;
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case NETLBL_NLTYPE_CIPSOV4:
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if (!info->attrs[NLBL_MGMT_A_CV4DOI])
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goto adddef_failure;
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tmp_val = nla_get_u32(info->attrs[NLBL_MGMT_A_CV4DOI]);
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/* We should be holding a rcu_read_lock() here while we hold
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* the result but since the entry will always be deleted when
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* the CIPSO DOI is deleted we aren't going to keep the
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* lock. */
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rcu_read_lock();
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entry->type_def.cipsov4 = cipso_v4_doi_getdef(tmp_val);
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if (entry->type_def.cipsov4 == NULL) {
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rcu_read_unlock();
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goto adddef_failure;
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}
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ret_val = netlbl_domhsh_add_default(entry, &audit_info);
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rcu_read_unlock();
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break;
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default:
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goto adddef_failure;
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}
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if (ret_val != 0)
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goto adddef_failure;
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return 0;
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adddef_failure:
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kfree(entry);
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return ret_val;
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}
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/**
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* netlbl_mgmt_removedef - Handle a REMOVEDEF message
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* @skb: the NETLINK buffer
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* @info: the Generic NETLINK info block
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*
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* Description:
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* Process a user generated REMOVEDEF message and remove the default domain
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* mapping. Returns zero on success, negative values on failure.
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*
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*/
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static int netlbl_mgmt_removedef(struct sk_buff *skb, struct genl_info *info)
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{
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struct netlbl_audit audit_info;
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netlbl_netlink_auditinfo(skb, &audit_info);
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return netlbl_domhsh_remove_default(&audit_info);
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}
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/**
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* netlbl_mgmt_listdef - Handle a LISTDEF message
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* @skb: the NETLINK buffer
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* @info: the Generic NETLINK info block
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*
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* Description:
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* Process a user generated LISTDEF message and dumps the default domain
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* mapping in a form suitable for use in a kernel generated LISTDEF message.
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* Returns zero on success, negative values on failure.
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*
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*/
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static int netlbl_mgmt_listdef(struct sk_buff *skb, struct genl_info *info)
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{
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int ret_val = -ENOMEM;
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struct sk_buff *ans_skb = NULL;
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void *data;
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struct netlbl_dom_map *entry;
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ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
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if (ans_skb == NULL)
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return -ENOMEM;
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data = genlmsg_put_reply(ans_skb, info, &netlbl_mgmt_gnl_family,
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0, NLBL_MGMT_C_LISTDEF);
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if (data == NULL)
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goto listdef_failure;
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rcu_read_lock();
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entry = netlbl_domhsh_getentry(NULL);
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if (entry == NULL) {
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ret_val = -ENOENT;
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goto listdef_failure_lock;
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}
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ret_val = nla_put_u32(ans_skb, NLBL_MGMT_A_PROTOCOL, entry->type);
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if (ret_val != 0)
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goto listdef_failure_lock;
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switch (entry->type) {
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case NETLBL_NLTYPE_CIPSOV4:
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ret_val = nla_put_u32(ans_skb,
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NLBL_MGMT_A_CV4DOI,
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entry->type_def.cipsov4->doi);
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if (ret_val != 0)
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goto listdef_failure_lock;
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break;
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}
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rcu_read_unlock();
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genlmsg_end(ans_skb, data);
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ret_val = genlmsg_reply(ans_skb, info);
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if (ret_val != 0)
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goto listdef_failure;
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return 0;
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listdef_failure_lock:
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rcu_read_unlock();
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listdef_failure:
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kfree_skb(ans_skb);
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return ret_val;
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}
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/**
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* netlbl_mgmt_protocols_cb - Write an individual PROTOCOL message response
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* @skb: the skb to write to
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* @seq: the NETLINK sequence number
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* @cb: the NETLINK callback
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* @protocol: the NetLabel protocol to use in the message
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*
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* Description:
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* This function is to be used in conjunction with netlbl_mgmt_protocols() to
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* answer a application's PROTOCOLS message. Returns the size of the message
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* on success, negative values on failure.
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*
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*/
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static int netlbl_mgmt_protocols_cb(struct sk_buff *skb,
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struct netlink_callback *cb,
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u32 protocol)
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{
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int ret_val = -ENOMEM;
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void *data;
|
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data = genlmsg_put(skb, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq,
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&netlbl_mgmt_gnl_family, NLM_F_MULTI,
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NLBL_MGMT_C_PROTOCOLS);
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if (data == NULL)
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goto protocols_cb_failure;
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|
|
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ret_val = nla_put_u32(skb, NLBL_MGMT_A_PROTOCOL, protocol);
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if (ret_val != 0)
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goto protocols_cb_failure;
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|
|
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return genlmsg_end(skb, data);
|
|
|
|
protocols_cb_failure:
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genlmsg_cancel(skb, data);
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return ret_val;
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}
|
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|
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/**
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* netlbl_mgmt_protocols - Handle a PROTOCOLS message
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* @skb: the NETLINK buffer
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* @cb: the NETLINK callback
|
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*
|
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* Description:
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* Process a user generated PROTOCOLS message and respond accordingly.
|
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*
|
|
*/
|
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static int netlbl_mgmt_protocols(struct sk_buff *skb,
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struct netlink_callback *cb)
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|
{
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u32 protos_sent = cb->args[0];
|
|
|
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if (protos_sent == 0) {
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if (netlbl_mgmt_protocols_cb(skb,
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cb,
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NETLBL_NLTYPE_UNLABELED) < 0)
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goto protocols_return;
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protos_sent++;
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}
|
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if (protos_sent == 1) {
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if (netlbl_mgmt_protocols_cb(skb,
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cb,
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NETLBL_NLTYPE_CIPSOV4) < 0)
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goto protocols_return;
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protos_sent++;
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}
|
|
|
|
protocols_return:
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cb->args[0] = protos_sent;
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return skb->len;
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}
|
|
|
|
/**
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|
* 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;
|
|
void *data;
|
|
|
|
ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
|
|
if (ans_skb == NULL)
|
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return -ENOMEM;
|
|
data = genlmsg_put_reply(ans_skb, info, &netlbl_mgmt_gnl_family,
|
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0, NLBL_MGMT_C_VERSION);
|
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if (data == NULL)
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goto version_failure;
|
|
|
|
ret_val = nla_put_u32(ans_skb,
|
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NLBL_MGMT_A_VERSION,
|
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NETLBL_PROTO_VERSION);
|
|
if (ret_val != 0)
|
|
goto version_failure;
|
|
|
|
genlmsg_end(ans_skb, data);
|
|
|
|
ret_val = genlmsg_reply(ans_skb, info);
|
|
if (ret_val != 0)
|
|
goto version_failure;
|
|
return 0;
|
|
|
|
version_failure:
|
|
kfree_skb(ans_skb);
|
|
return ret_val;
|
|
}
|
|
|
|
|
|
/*
|
|
* NetLabel Generic NETLINK Command Definitions
|
|
*/
|
|
|
|
static struct genl_ops netlbl_mgmt_genl_c_add = {
|
|
.cmd = NLBL_MGMT_C_ADD,
|
|
.flags = GENL_ADMIN_PERM,
|
|
.policy = netlbl_mgmt_genl_policy,
|
|
.doit = netlbl_mgmt_add,
|
|
.dumpit = NULL,
|
|
};
|
|
|
|
static struct genl_ops netlbl_mgmt_genl_c_remove = {
|
|
.cmd = NLBL_MGMT_C_REMOVE,
|
|
.flags = GENL_ADMIN_PERM,
|
|
.policy = netlbl_mgmt_genl_policy,
|
|
.doit = netlbl_mgmt_remove,
|
|
.dumpit = NULL,
|
|
};
|
|
|
|
static struct genl_ops netlbl_mgmt_genl_c_listall = {
|
|
.cmd = NLBL_MGMT_C_LISTALL,
|
|
.flags = 0,
|
|
.policy = netlbl_mgmt_genl_policy,
|
|
.doit = NULL,
|
|
.dumpit = netlbl_mgmt_listall,
|
|
};
|
|
|
|
static struct genl_ops netlbl_mgmt_genl_c_adddef = {
|
|
.cmd = NLBL_MGMT_C_ADDDEF,
|
|
.flags = GENL_ADMIN_PERM,
|
|
.policy = netlbl_mgmt_genl_policy,
|
|
.doit = netlbl_mgmt_adddef,
|
|
.dumpit = NULL,
|
|
};
|
|
|
|
static struct genl_ops netlbl_mgmt_genl_c_removedef = {
|
|
.cmd = NLBL_MGMT_C_REMOVEDEF,
|
|
.flags = GENL_ADMIN_PERM,
|
|
.policy = netlbl_mgmt_genl_policy,
|
|
.doit = netlbl_mgmt_removedef,
|
|
.dumpit = NULL,
|
|
};
|
|
|
|
static struct genl_ops netlbl_mgmt_genl_c_listdef = {
|
|
.cmd = NLBL_MGMT_C_LISTDEF,
|
|
.flags = 0,
|
|
.policy = netlbl_mgmt_genl_policy,
|
|
.doit = netlbl_mgmt_listdef,
|
|
.dumpit = NULL,
|
|
};
|
|
|
|
static struct genl_ops netlbl_mgmt_genl_c_protocols = {
|
|
.cmd = NLBL_MGMT_C_PROTOCOLS,
|
|
.flags = 0,
|
|
.policy = netlbl_mgmt_genl_policy,
|
|
.doit = NULL,
|
|
.dumpit = netlbl_mgmt_protocols,
|
|
};
|
|
|
|
static struct genl_ops netlbl_mgmt_genl_c_version = {
|
|
.cmd = NLBL_MGMT_C_VERSION,
|
|
.flags = 0,
|
|
.policy = netlbl_mgmt_genl_policy,
|
|
.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_listall);
|
|
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_protocols);
|
|
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;
|
|
}
|