--- /dev/null
+/*
+ * 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"
+
+/* Argument struct for netlbl_domhsh_walk() */
+struct netlbl_domhsh_walk_arg {
+ struct netlink_callback *nl_cb;
+ struct sk_buff *skb;
+ u32 seq;
+};
+
+/* 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 = NLBL_MGMT_A_MAX,
+};
+
+/* NetLabel Netlink attribute policy */
+static struct nla_policy netlbl_mgmt_genl_policy[NLBL_MGMT_A_MAX + 1] = {
+ [NLBL_MGMT_A_DOMAIN] = { .type = NLA_NUL_STRING },
+ [NLBL_MGMT_A_PROTOCOL] = { .type = NLA_U32 },
+ [NLBL_MGMT_A_VERSION] = { .type = NLA_U32 },
+ [NLBL_MGMT_A_CV4DOI] = { .type = NLA_U32 },
+};
+
+/*
+ * 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 netlbl_dom_map *entry = NULL;
+ size_t tmp_size;
+ u32 tmp_val;
+ struct netlbl_audit audit_info;
+
+ if (!info->attrs[NLBL_MGMT_A_DOMAIN] ||
+ !info->attrs[NLBL_MGMT_A_PROTOCOL])
+ goto add_failure;
+
+ netlbl_netlink_auditinfo(skb, &audit_info);
+
+ entry = kzalloc(sizeof(*entry), GFP_KERNEL);
+ if (entry == NULL) {
+ ret_val = -ENOMEM;
+ goto add_failure;
+ }
+ tmp_size = nla_len(info->attrs[NLBL_MGMT_A_DOMAIN]);
+ entry->domain = kmalloc(tmp_size, GFP_KERNEL);
+ if (entry->domain == NULL) {
+ ret_val = -ENOMEM;
+ goto add_failure;
+ }
+ entry->type = nla_get_u32(info->attrs[NLBL_MGMT_A_PROTOCOL]);
+ nla_strlcpy(entry->domain, info->attrs[NLBL_MGMT_A_DOMAIN], tmp_size);
+
+ switch (entry->type) {
+ case NETLBL_NLTYPE_UNLABELED:
+ ret_val = netlbl_domhsh_add(entry, &audit_info);
+ break;
+ case NETLBL_NLTYPE_CIPSOV4:
+ if (!info->attrs[NLBL_MGMT_A_CV4DOI])
+ goto add_failure;
+
+ tmp_val = nla_get_u32(info->attrs[NLBL_MGMT_A_CV4DOI]);
+ /* 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();
+ goto add_failure;
+ }
+ ret_val = netlbl_domhsh_add(entry, &audit_info);
+ rcu_read_unlock();
+ break;
+ default:
+ goto add_failure;
+ }
+ if (ret_val != 0)
+ goto add_failure;
+
+ return 0;
+
+add_failure:
+ if (entry)
+ kfree(entry->domain);
+ kfree(entry);
+ 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)
+{
+ char *domain;
+ struct netlbl_audit audit_info;
+
+ if (!info->attrs[NLBL_MGMT_A_DOMAIN])
+ return -EINVAL;
+
+ netlbl_netlink_auditinfo(skb, &audit_info);
+
+ domain = nla_data(info->attrs[NLBL_MGMT_A_DOMAIN]);
+ return netlbl_domhsh_remove(domain, &audit_info);
+}
+
+/**
+ * netlbl_mgmt_listall_cb - netlbl_domhsh_walk() callback for LISTALL
+ * @entry: the domain mapping hash table entry
+ * @arg: the netlbl_domhsh_walk_arg structure
+ *
+ * Description:
+ * This function is designed to be used as a callback to the
+ * netlbl_domhsh_walk() function for use in generating a response for a LISTALL
+ * message. Returns the size of the message on success, negative values on
+ * failure.
+ *
+ */
+static int netlbl_mgmt_listall_cb(struct netlbl_dom_map *entry, void *arg)
+{
+ int ret_val = -ENOMEM;
+ struct netlbl_domhsh_walk_arg *cb_arg = arg;
+ void *data;
+
+ data = genlmsg_put(cb_arg->skb, NETLINK_CB(cb_arg->nl_cb->skb).pid,
+ cb_arg->seq, &netlbl_mgmt_gnl_family,
+ NLM_F_MULTI, NLBL_MGMT_C_LISTALL);
+ if (data == NULL)
+ goto listall_cb_failure;
+
+ ret_val = nla_put_string(cb_arg->skb,
+ NLBL_MGMT_A_DOMAIN,
+ entry->domain);
+ if (ret_val != 0)
+ goto listall_cb_failure;
+ ret_val = nla_put_u32(cb_arg->skb, NLBL_MGMT_A_PROTOCOL, entry->type);
+ if (ret_val != 0)
+ goto listall_cb_failure;
+ switch (entry->type) {
+ case NETLBL_NLTYPE_CIPSOV4:
+ ret_val = nla_put_u32(cb_arg->skb,
+ NLBL_MGMT_A_CV4DOI,
+ entry->type_def.cipsov4->doi);
+ if (ret_val != 0)
+ goto listall_cb_failure;
+ break;
+ }
+
+ cb_arg->seq++;
+ return genlmsg_end(cb_arg->skb, data);
+
+listall_cb_failure:
+ genlmsg_cancel(cb_arg->skb, data);
+ return ret_val;
+}
+
+/**
+ * netlbl_mgmt_listall - Handle a LISTALL message
+ * @skb: the NETLINK buffer
+ * @cb: the NETLINK callback
+ *
+ * Description:
+ * Process a user generated LISTALL message and dumps the domain hash table in
+ * a form suitable for use in a kernel generated LISTALL message. Returns zero
+ * on success, negative values on failure.
+ *
+ */
+static int netlbl_mgmt_listall(struct sk_buff *skb,
+ struct netlink_callback *cb)
+{
+ struct netlbl_domhsh_walk_arg cb_arg;
+ u32 skip_bkt = cb->args[0];
+ u32 skip_chain = cb->args[1];
+
+ cb_arg.nl_cb = cb;
+ cb_arg.skb = skb;
+ cb_arg.seq = cb->nlh->nlmsg_seq;
+
+ netlbl_domhsh_walk(&skip_bkt,
+ &skip_chain,
+ netlbl_mgmt_listall_cb,
+ &cb_arg);
+
+ cb->args[0] = skip_bkt;
+ cb->args[1] = skip_chain;
+ return skb->len;
+}
+
+/**
+ * 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 netlbl_dom_map *entry = NULL;
+ u32 tmp_val;
+ struct netlbl_audit audit_info;
+
+ if (!info->attrs[NLBL_MGMT_A_PROTOCOL])
+ goto adddef_failure;
+
+ netlbl_netlink_auditinfo(skb, &audit_info);
+
+ entry = kzalloc(sizeof(*entry), GFP_KERNEL);
+ if (entry == NULL) {
+ ret_val = -ENOMEM;
+ goto adddef_failure;
+ }
+ entry->type = nla_get_u32(info->attrs[NLBL_MGMT_A_PROTOCOL]);
+
+ switch (entry->type) {
+ case NETLBL_NLTYPE_UNLABELED:
+ ret_val = netlbl_domhsh_add_default(entry, &audit_info);
+ break;
+ case NETLBL_NLTYPE_CIPSOV4:
+ if (!info->attrs[NLBL_MGMT_A_CV4DOI])
+ goto adddef_failure;
+
+ tmp_val = nla_get_u32(info->attrs[NLBL_MGMT_A_CV4DOI]);
+ /* 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();
+ goto adddef_failure;
+ }
+ ret_val = netlbl_domhsh_add_default(entry, &audit_info);
+ rcu_read_unlock();
+ break;
+ default:
+ goto adddef_failure;
+ }
+ if (ret_val != 0)
+ goto adddef_failure;
+
+ return 0;
+
+adddef_failure:
+ kfree(entry);
+ 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)
+{
+ struct netlbl_audit audit_info;
+
+ netlbl_netlink_auditinfo(skb, &audit_info);
+
+ return netlbl_domhsh_remove_default(&audit_info);
+}
+
+/**
+ * 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 = NULL;
+ void *data;
+ struct netlbl_dom_map *entry;
+
+ ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
+ if (ans_skb == NULL)
+ return -ENOMEM;
+ data = genlmsg_put_reply(ans_skb, info, &netlbl_mgmt_gnl_family,
+ 0, NLBL_MGMT_C_LISTDEF);
+ if (data == NULL)
+ goto listdef_failure;
+
+ rcu_read_lock();
+ entry = netlbl_domhsh_getentry(NULL);
+ if (entry == NULL) {
+ ret_val = -ENOENT;
+ goto listdef_failure_lock;
+ }
+ ret_val = nla_put_u32(ans_skb, NLBL_MGMT_A_PROTOCOL, entry->type);
+ if (ret_val != 0)
+ goto listdef_failure_lock;
+ switch (entry->type) {
+ case NETLBL_NLTYPE_CIPSOV4:
+ ret_val = nla_put_u32(ans_skb,
+ NLBL_MGMT_A_CV4DOI,
+ entry->type_def.cipsov4->doi);
+ if (ret_val != 0)
+ goto listdef_failure_lock;
+ break;
+ }
+ rcu_read_unlock();
+
+ genlmsg_end(ans_skb, data);
+
+ ret_val = genlmsg_reply(ans_skb, info);
+ if (ret_val != 0)
+ goto listdef_failure;
+ return 0;
+
+listdef_failure_lock:
+ rcu_read_unlock();
+listdef_failure:
+ kfree_skb(ans_skb);
+ return ret_val;
+}
+
+/**
+ * netlbl_mgmt_protocols_cb - Write an individual PROTOCOL message response
+ * @skb: the skb to write to
+ * @seq: the NETLINK sequence number
+ * @cb: the NETLINK callback
+ * @protocol: the NetLabel protocol to use in the message
+ *
+ * Description:
+ * This function is to be used in conjunction with netlbl_mgmt_protocols() to
+ * answer a application's PROTOCOLS message. Returns the size of the message
+ * on success, negative values on failure.
+ *
+ */
+static int netlbl_mgmt_protocols_cb(struct sk_buff *skb,
+ struct netlink_callback *cb,
+ u32 protocol)
+{
+ int ret_val = -ENOMEM;
+ void *data;
+
+ data = genlmsg_put(skb, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq,
+ &netlbl_mgmt_gnl_family, NLM_F_MULTI,
+ NLBL_MGMT_C_PROTOCOLS);
+ if (data == NULL)
+ goto protocols_cb_failure;
+
+ ret_val = nla_put_u32(skb, NLBL_MGMT_A_PROTOCOL, protocol);
+ if (ret_val != 0)
+ goto protocols_cb_failure;
+
+ return genlmsg_end(skb, data);
+
+protocols_cb_failure:
+ genlmsg_cancel(skb, data);
+ return ret_val;
+}
+
+/**
+ * netlbl_mgmt_protocols - Handle a PROTOCOLS message
+ * @skb: the NETLINK buffer
+ * @cb: the NETLINK callback
+ *
+ * Description:
+ * Process a user generated PROTOCOLS message and respond accordingly.
+ *
+ */
+static int netlbl_mgmt_protocols(struct sk_buff *skb,
+ struct netlink_callback *cb)
+{
+ u32 protos_sent = cb->args[0];
+
+ if (protos_sent == 0) {
+ if (netlbl_mgmt_protocols_cb(skb,
+ cb,
+ NETLBL_NLTYPE_UNLABELED) < 0)
+ goto protocols_return;
+ protos_sent++;
+ }
+ if (protos_sent == 1) {
+ if (netlbl_mgmt_protocols_cb(skb,
+ cb,
+ NETLBL_NLTYPE_CIPSOV4) < 0)
+ goto protocols_return;
+ protos_sent++;
+ }
+
+protocols_return:
+ cb->args[0] = protos_sent;
+ return skb->len;
+}
+
+/**
+ * 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)
+ return -ENOMEM;
+ data = genlmsg_put_reply(ans_skb, info, &netlbl_mgmt_gnl_family,
+ 0, NLBL_MGMT_C_VERSION);
+ if (data == NULL)
+ goto version_failure;
+
+ ret_val = nla_put_u32(ans_skb,
+ NLBL_MGMT_A_VERSION,
+ 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;
+}
git://git.onelab.eu / linux-2.6.git / blobdiff