[TOMOYO #6 retry 14/21] Network access control functions.

[Kentaro Takeda]

TOMOYO Linux checks permission by the following four parameters.
  * protocol type (TCP, UDP, RAW)
  * access type (bind, listen, connect, accept)
  * IP address (Both IPv4 and IPv6 are available)
  * port number
In order to check 'TCP accept' and 'UDP connect',
modification against net/socket.c and net/core/datagram.c is needed.

Each permission can be automatically accumulated into
the policy of each domain using 'learning mode'.

Signed-off-by: Kentaro Takeda <takedakn@xxxxxxxxxxxxx>
Signed-off-by: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx>
---
 security/tomoyo/net.c |  934 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 934 insertions(+)

--- /dev/null
+++ linux-2.6-mm/security/tomoyo/net.c
@@ -0,0 +1,934 @@
+/*
+ * security/tomoyo/net.c
+ *
+ * Network access control functions for TOMOYO Linux.
+ */
+
+#include "tomoyo.h"
+#include "realpath.h"
+
+/*************************  AUDIT FUNCTIONS  *************************/
+
+static int tmy_audit_network_log(const bool is_ipv6,
+				 const char *operation,
+				 const u8 *address,
+				 const u16 port,
+				 const bool is_granted,
+				 const u8 profile,
+				 const unsigned int mode)
+{
+	char *buf;
+	int len = 256;
+
+	if (is_granted) {
+		if (!tmy_audit_grant())
+			return 0;
+	} else {
+		if (!tmy_audit_reject())
+			return 0;
+	}
+
+	buf = tmy_init_audit_log(&len, profile, mode);
+	if (!buf)
+		return -ENOMEM;
+
+	tmy_sncatprintf(buf, len - 1, TMY_ALLOW_NETWORK "%s ", operation);
+
+	if (is_ipv6)
+		tmy_print_ipv6(buf + strlen(buf), len - strlen(buf),
+			       (const struct in6_addr *) address);
+	else {
+		u32 ip = *address;
+		tmy_sncatprintf(buf, len - 1, NIPQUAD_FMT, NIPQUAD(ip));
+	}
+
+	tmy_sncatprintf(buf, len - 1, " %u\n", port);
+
+	return tmy_write_audit_log(buf, is_granted);
+}
+
+/*************************  UTILITY FUNCTIONS  *************************/
+
+static const struct in6_addr *tmy_save_ipv6_address(const struct in6_addr *addr)
+{
+	static const int block_size = 16;
+	struct addr_list {
+		struct in6_addr addr[block_size];
+		struct addr_list *next;
+		u32 in_use_count;
+	};
+	static struct addr_list *list;
+	struct addr_list *ptr;
+	static DEFINE_MUTEX(lock);
+	int i = block_size;
+	if (!addr)
+		return NULL;
+	mutex_lock(&lock);
+	for (ptr = list; ptr; ptr = ptr->next) {
+		for (i = 0; i < ptr->in_use_count; i++)
+			if (memcmp(&ptr->addr[i], addr, sizeof(*addr)) == 0)
+				goto out;
+		if (i < block_size)
+			break;
+	}
+	if (i == block_size) {
+		struct addr_list *p = list;
+		ptr = tmy_alloc_element(sizeof(*ptr));
+		if (!ptr)
+			goto out;
+		if (p) {
+			while (p->next)
+				p = p->next;
+			p->next = ptr;
+		} else
+			list = ptr;
+		i = 0;
+	}
+	ptr->addr[ptr->in_use_count++] = *addr;
+out:
+	mutex_unlock(&lock);
+	return ptr ? &ptr->addr[i] : NULL;
+}
+
+/*************************  ADDRESS GROUP HANDLER  *************************/
+
+/* List of address group. */
+static LIST_HEAD(address_group_list);
+
+static int tmy_add_address_group_entry(const char *group_name,
+				       const bool is_ipv6,
+				       const u8 *min_address,
+				       const u8 *max_address,
+				       const bool is_delete)
+{
+	static DEFINE_MUTEX(mutex);
+	struct address_group_entry *new_group;
+	struct address_group_entry *group;
+	struct address_group_member *new_member;
+	struct address_group_member *member;
+	const struct path_info *saved_group_name;
+	int error = -ENOMEM;
+	bool found = 0;
+	const u32 min_ip = ntohl(*(u32 *) min_address);
+	const u32 max_ip = ntohl(*(u32 *) max_address);
+	const struct in6_addr *saved_min_address = NULL;
+	const struct in6_addr *saved_max_address = NULL;
+	if (is_ipv6) {
+		saved_min_address =
+			tmy_save_ipv6_address((struct in6_addr *) min_address);
+		saved_max_address =
+			tmy_save_ipv6_address((struct in6_addr *) max_address);
+		if (!saved_min_address || !saved_max_address)
+			return -ENOMEM;
+	}
+
+	if (!tmy_correct_path(group_name, 0, 0, 0, __FUNCTION__) ||
+	    !group_name[0])
+		return -EINVAL;
+
+	saved_group_name = tmy_save_name(group_name);
+	if (!saved_group_name)
+		return -ENOMEM;
+
+	mutex_lock(&mutex);
+
+	list_for_each_entry(group, &address_group_list, list) {
+		if (saved_group_name != group->group_name)
+			continue;
+		list_for_each_entry(member, &group->address_group_member_list,
+				    list) {
+			if (member->is_ipv6 != is_ipv6)
+				continue;
+			if (is_ipv6) {
+				if (member->min.ipv6 != saved_min_address ||
+				    member->max.ipv6 != saved_max_address)
+					continue;
+			} else {
+				if (member->min.ipv4 != min_ip ||
+				    member->max.ipv4 != max_ip)
+					continue;
+			}
+			member->is_deleted = is_delete;
+			error = 0;
+			goto out;
+		}
+		found = 1;
+		break;
+	}
+
+	if (is_delete) {
+		error = -ENOENT;
+		goto out;
+	}
+
+	if (!found) {
+		new_group = tmy_alloc_element(sizeof(*new_group));
+		if (!new_group)
+			goto out;
+		INIT_LIST_HEAD(&new_group->address_group_member_list);
+		new_group->group_name = saved_group_name;
+		list_add_tail_mb(&new_group->list, &address_group_list);
+		group = new_group;
+	}
+
+	new_member = tmy_alloc_element(sizeof(*new_member));
+	if (!new_member)
+		goto out;
+
+	new_member->is_ipv6 = is_ipv6;
+
+	if (is_ipv6) {
+		new_member->min.ipv6 = saved_min_address;
+		new_member->max.ipv6 = saved_max_address;
+	} else {
+		new_member->min.ipv4 = min_ip;
+		new_member->max.ipv4 = max_ip;
+	}
+
+	list_add_tail_mb(&new_member->list, &group->address_group_member_list);
+	error = 0;
+out: ;
+	mutex_unlock(&mutex);
+
+	return error;
+}
+
+/**
+ * tmy_add_address_group_policy - add or delete address group policy.
+ * @data: a line to parse.
+ * @is_delete: is this delete request?
+ *
+ * Returns zero on success.
+ * Returns nonzero on failure.
+ */
+int tmy_add_address_group_policy(char *data, const bool is_delete)
+{
+	int count;
+	bool is_ipv6;
+	u8 min_address[16];
+	u8 max_address[16];
+	char *cp = strchr(data, ' ');
+
+	/*** Parse address_group_name part ***/
+	if (!cp)
+		return -EINVAL;
+	*cp++ = '\0';
+
+	/*** Parse address part ***/
+	/* single IPv6 or IPv6 range */
+	count = strcspn(cp, "-");
+	if (!in6_pton(cp, count, min_address, -1, NULL))
+		goto no_ipv6;
+	is_ipv6 = 1;
+	cp += count;
+	if (*cp++ != '-')
+		goto copy_address;
+	if (!in6_pton(cp, -1, max_address, -1, NULL))
+		goto out;
+	goto ok;
+no_ipv6:
+	/* single IPv4 or IPv4 range */
+	if (!in4_pton(cp, count, min_address, -1, NULL))
+		goto out;
+	is_ipv6 = 0;
+	cp += count;
+	if (*cp++ != '-')
+		goto copy_address;
+	if (!in4_pton(cp, -1, max_address, -1, NULL))
+		goto out;
+	goto ok;
+copy_address:
+	memmove(max_address, min_address, sizeof(max_address));
+ok: ;
+	return tmy_add_address_group_entry(data, is_ipv6,
+					   min_address,
+					   max_address, is_delete);
+out:
+	return -EINVAL;
+}
+
+static struct address_group_entry *tmy_new_address_group(const char *name)
+{
+	int i;
+	struct address_group_entry *group;
+
+	for (i = 0; i <= 1; i++) {
+		list_for_each_entry(group, &address_group_list, list) {
+			if (strcmp(name, group->group_name->name) == 0)
+				return group;
+		}
+
+		if (i == 0) {
+			/*
+			 * Add a dummy entry to create new address group
+			 * and delete that entry.
+			 */
+			const u8 dum[4] = { 0, 0, 0, 0 };
+			tmy_add_address_group_entry(name, 0, dum, dum, 0);
+			tmy_add_address_group_entry(name, 0, dum, dum, 1);
+		}
+	}
+
+	return NULL;
+}
+
+static int tmy_address_match_group(const bool is_ipv6,
+				   const u8 *address,
+				   const struct address_group_entry *group)
+{
+	struct address_group_member *member;
+	const u32 ip = ntohl(*(u32 *) address);
+
+	list_for_each_entry(member, &group->address_group_member_list, list) {
+		if (member->is_deleted)
+			continue;
+
+		if (member->is_ipv6) {
+
+			if (is_ipv6 &&
+			    memcmp(member->min.ipv6, address, 16) <= 0 &&
+			    memcmp(address, member->max.ipv6, 16) <= 0)
+				return 1;
+
+		} else {
+
+			if (!is_ipv6 &&
+			    member->min.ipv4 <= ip &&
+			    ip <= member->max.ipv4)
+				return 1;
+
+		}
+	}
+
+	return 0;
+}
+
+static int tmy_read_address_group(struct io_buffer *head,
+			       struct address_group_entry *group,
+			       struct address_group_member *member)
+{
+	char buf[128];
+	if (!member)
+		return 0;
+
+	if (member->is_ipv6) {
+
+		const struct in6_addr *min_addr = member->min.ipv6;
+		const struct in6_addr *max_addr = member->max.ipv6;
+
+		tmy_print_ipv6(buf, sizeof(buf), min_addr);
+
+		if (min_addr != max_addr) {
+			char *cp = strchr(buf, '\0');
+			int len = sizeof(buf) - strlen(buf) - 1;
+
+			*cp++ = '-';
+			tmy_print_ipv6(cp, len, max_addr);
+		}
+
+	} else {
+
+		const u32 min_addr = member->min.ipv4;
+		const u32 max_addr = member->max.ipv4;
+
+		memset(buf, 0, sizeof(buf));
+		snprintf(buf, sizeof(buf) - 1,
+			 NIPQUAD_FMT, HIPQUAD(min_addr));
+
+		if (min_addr != max_addr)
+			tmy_sncatprintf(buf, sizeof(buf) - 1,
+					"-" NIPQUAD_FMT, HIPQUAD(max_addr));
+	}
+
+	return tmy_io_printf(head, TMY_ADDRESS_GROUP "%s %s\n",
+			     group->group_name->name, buf);
+}
+
+/**
+ * tmy_read_address_group_policy - read address group policy
+ * @head: pointer to "struct io_buffer".
+ *
+ * Returns nonzero if reading incomplete.
+ * Returns zero otherwise.
+ */
+int tmy_read_address_group_policy(struct io_buffer *head)
+{
+	struct list_head *gpos;
+	struct list_head *mpos;
+	list_for_each_cookie(gpos, head->read_var1, &address_group_list) {
+		struct address_group_entry *group;
+		group = list_entry(gpos, struct address_group_entry, list);
+		list_for_each_cookie(mpos, head->read_var2,
+				     &group->address_group_member_list) {
+			struct address_group_member *member;
+			member = list_entry(mpos, struct address_group_member,
+					    list);
+			if (member->is_deleted)
+				continue;
+			if (tmy_read_address_group(head, group, member))
+				return -ENOMEM;
+		}
+	}
+	return 0;
+}
+
+/***********************  NETWORK NETWORK ACL HANDLER  ***********************/
+
+/**
+ * tmy_print_ipv6 - print ipv6 address
+ * @buffer:     pointer to buffer to save the result.
+ * @buffer_len: sizeof @buffer .
+ * @ip:         pointer to an IPv6 address in network byte order.
+ *
+ * Returns @buffer .
+ */
+char *tmy_print_ipv6(char *buffer, const int buffer_len,
+		     const struct in6_addr *ip)
+{
+	memset(buffer, 0, buffer_len);
+	snprintf(buffer, buffer_len - 1, NIP6_FMT, NIP6(*ip));
+	return buffer;
+}
+
+/**
+ * tmy_network2keyword - get keyword from access control index.
+ * @operation: index number.
+ *
+ * Returns keyword that corresponds with @operation .
+ */
+const char *tmy_network2keyword(const unsigned int operation)
+{
+	const char *keyword = "unknown";
+	switch (operation) {
+	case TMY_NETWORK_ACL_UDP_BIND:
+		keyword = "UDP bind";
+		break;
+	case TMY_NETWORK_ACL_UDP_CONNECT:
+		keyword = "UDP connect";
+		break;
+	case TMY_NETWORK_ACL_TCP_BIND:
+		keyword = "TCP bind";
+		break;
+	case TMY_NETWORK_ACL_TCP_LISTEN:
+		keyword = "TCP listen";
+		break;
+	case TMY_NETWORK_ACL_TCP_CONNECT:
+		keyword = "TCP connect";
+		break;
+	case TMY_NETWORK_ACL_TCP_ACCEPT:
+		keyword = "TCP accept";
+		break;
+	case TMY_NETWORK_ACL_RAW_BIND:
+		keyword = "RAW bind";
+		break;
+	case TMY_NETWORK_ACL_RAW_CONNECT:
+		keyword = "RAW connect";
+		break;
+	}
+	return keyword;
+}
+
+/* Compare IPv4/IPv6 address. */
+static int tmy_cmp_network_entry(const u8 record_type,
+				 struct net_acl *acl,
+				 const struct address_group_entry *group,
+				 const u32 min_ip,
+				 const u32 max_ip,
+				 const struct in6_addr *saved_min_address,
+				 const struct in6_addr *saved_max_address)
+{
+	switch (record_type) {
+	case TMY_TYPE_ADDRESS_GROUP:
+		return acl->u.group == group;
+	case TMY_TYPE_IPv4:
+		return acl->u.ipv4.min == min_ip &&
+			max_ip == acl->u.ipv4.max;
+	default:
+		return acl->u.ipv6.min == saved_min_address &&
+			saved_max_address ==  acl->u.ipv6.max;
+	}
+}
+
+static int tmy_add_network_entry(const u8 operation,
+				 const u8 record_type,
+				 const struct address_group_entry *group,
+				 const u8 *min_address,
+				 const u8 *max_address,
+				 const u16 min_port,
+				 const u16 max_port,
+				 struct domain_info *domain,
+				 const struct condition_list *cond,
+				 const bool is_delete)
+{
+	struct acl_info *ptr;
+	struct net_acl *acl;
+	int error = -ENOMEM;
+	/* using host byte order to allow u32 comparison than memcmp().*/
+	const u32 min_ip = ntohl(*(u32 *) min_address);
+	const u32 max_ip = ntohl(*(u32 *) max_address);
+	const struct in6_addr *saved_min_address = NULL;
+	const struct in6_addr *saved_max_address = NULL;
+	if (!domain)
+		return -EINVAL;
+
+	if (record_type == TMY_TYPE_IPv6) {
+		saved_min_address =
+			tmy_save_ipv6_address((struct in6_addr *) min_address);
+		saved_max_address =
+			tmy_save_ipv6_address((struct in6_addr *) max_address);
+		if (!saved_min_address || !saved_max_address)
+			return -ENOMEM;
+	}
+
+	mutex_lock(&domain_acl_lock);
+
+	if (is_delete)
+		goto remove;
+
+	list_for_each_entry(ptr, &domain->acl_info_list, list) {
+		acl = container_of(ptr, struct net_acl, head);
+		if (ptr->type == TMY_TYPE_IP_NETWORK_ACL &&
+		    ptr->cond == cond &&
+		    acl->operation_type == operation &&
+		    acl->record_type == record_type &&
+		    acl->min_port == min_port &&
+		    max_port == acl->max_port &&
+		    tmy_cmp_network_entry(record_type, acl,
+					  group, min_ip, max_ip,
+					  saved_min_address,
+					  saved_max_address)) {
+			ptr->is_deleted = 0;
+			error = 0;
+			goto ok;
+		}
+	}
+	/* Not found. Append it to the tail. */
+	acl = tmy_alloc_element(sizeof(*acl));
+	if (!acl)
+		goto ok;
+
+	acl->head.type = TMY_TYPE_IP_NETWORK_ACL;
+	acl->head.cond = cond;
+	acl->operation_type = operation;
+	acl->record_type = record_type;
+
+	if (record_type == TMY_TYPE_ADDRESS_GROUP)
+		acl->u.group = group;
+	else if (record_type == TMY_TYPE_IPv4) {
+		acl->u.ipv4.min = min_ip;
+		acl->u.ipv4.max = max_ip;
+	} else {
+		acl->u.ipv6.min = saved_min_address;
+		acl->u.ipv6.max = saved_max_address;
+	}
+
+	acl->min_port = min_port;
+	acl->max_port = max_port;
+	error = tmy_add_acl(domain, &acl->head);
+	goto ok;
+remove: ;
+	error = -ENOENT;
+	list_for_each_entry(ptr, &domain->acl_info_list, list) {
+		acl = container_of(ptr, struct net_acl, head);
+		if (ptr->type != TMY_TYPE_IP_NETWORK_ACL ||
+		    ptr->cond != cond ||
+		    ptr->is_deleted ||
+		    acl->operation_type != operation ||
+		    acl->record_type != record_type ||
+		    acl->min_port != min_port ||
+		    acl->max_port != max_port ||
+		    !tmy_cmp_network_entry(record_type, acl,
+					   group, min_ip, max_ip,
+					   saved_min_address,
+					   saved_max_address))
+			continue;
+		error = tmy_del_acl(ptr);
+		break;
+	}
+ok: ;
+	mutex_unlock(&domain_acl_lock);
+
+	return error;
+}
+
+/* Check network permission. */
+static int tmy_network_entry(const bool is_ipv6,
+			     const int operation,
+			     const u8 *address,
+			     const u16 port)
+{
+	struct domain_info * const domain = TMY_SECURITY->domain;
+	const u8 profile = domain->profile;
+	const unsigned int mode = tmy_flags(TMY_MAC_FOR_NETWORK);
+	struct acl_info *ptr;
+	const char *keyword = tmy_network2keyword(operation);
+	const bool is_enforce = (mode == 3);
+	/* using host byte order to allow u32 comparison than memcmp().*/
+	const u32 ip = ntohl(*(u32 *) address);
+	bool found = 0;
+
+	if (!mode)
+		return 0;
+
+	list_for_each_entry(ptr, &domain->acl_info_list, list) {
+		struct net_acl *acl;
+		acl = container_of(ptr, struct net_acl, head);
+		if (ptr->type != TMY_TYPE_IP_NETWORK_ACL ||
+		    ptr->is_deleted ||
+		    acl->operation_type != operation ||
+		    port < acl->min_port ||
+		    acl->max_port < port ||
+		    tmy_check_condition(ptr->cond, NULL))
+			continue;
+
+		if (acl->record_type == TMY_TYPE_ADDRESS_GROUP) {
+			if (tmy_address_match_group(is_ipv6, address,
+						    acl->u.group)) {
+				found = 1;
+				break;
+			}
+		} else if (acl->record_type == TMY_TYPE_IPv4) {
+			if (!is_ipv6 &&
+			    (acl->u.ipv4.min <= ip && ip <= acl->u.ipv4.max)) {
+				found = 1;
+				break;
+			}
+		} else {
+			if (is_ipv6 &&
+			    memcmp(acl->u.ipv6.min, address, 16) <= 0 &&
+			    memcmp(address, acl->u.ipv6.max, 16) <= 0) {
+				found = 1;
+				break;
+			}
+		}
+	}
+
+	tmy_audit_network_log(is_ipv6, keyword, address,
+			      port, found, profile, mode);
+
+	if (found)
+		return 0;
+
+	if (tmy_flags(TMY_VERBOSE)) {
+		if (is_ipv6) {
+			char buf[64];
+			tmy_print_ipv6(buf, sizeof(buf),
+				       (const struct in6_addr *) address);
+			tmy_audit("TOMOYO-%s: %s to %s %u denied for %s\n",
+				  tmy_getmsg(is_enforce), keyword, buf, port,
+				  tmy_lastname(domain));
+		} else {
+			tmy_audit("TOMOYO-%s: %s to %u.%u.%u.%u %u denied for "
+				  "%s\n", tmy_getmsg(is_enforce), keyword,
+				  HIPQUAD(ip), port, tmy_lastname(domain));
+		}
+	}
+
+	if (is_enforce) {
+
+		if (is_ipv6) {
+
+			char buf[64];
+
+			tmy_print_ipv6(buf, sizeof(buf),
+				       (const struct in6_addr *) address);
+			return tmy_supervisor("%s\n" TMY_ALLOW_NETWORK
+					      "%s %s %u\n",
+					      domain->domainname->name, keyword,
+					      buf, port);
+
+		}
+
+		return tmy_supervisor("%s\n" TMY_ALLOW_NETWORK
+				      "%s " NIPQUAD_FMT " %u\n",
+				      domain->domainname->name, keyword,
+				      HIPQUAD(ip), port);
+
+	}
+
+	if (mode == 1 && tmy_quota())
+		tmy_add_network_entry(operation,
+				      is_ipv6 ? TMY_TYPE_IPv6 : TMY_TYPE_IPv4,
+				      NULL, address, address,
+				      port, port, domain, NULL, 0);
+
+	return 0;
+}
+
+/**
+ * tmy_add_network_policy - add or delete network policy.
+ * @data:      a line to parse.
+ * @domain:    pointer to "struct domain_info".
+ * @cond:      pointer to "struct condition_list". May be NULL.
+ * @is_delete: is this delete request?
+ *
+ * Returns zero on success.
+ * Returns nonzero on failure.
+ */
+int tmy_add_network_policy(char *data,
+			   struct domain_info *domain,
+			   const struct condition_list *cond,
+			   const bool is_delete)
+{
+	u8 sock_type;
+	u8 operation;
+	u8 record_type;
+	u8 min_address[16];
+	u8 max_address[16];
+	struct address_group_entry *group = NULL;
+	u16 min_port;
+	u16 max_port;
+	int count;
+	char *cp1 = NULL;
+	char *cp2 = NULL;
+
+	cp1 = strchr(data, ' ');
+	if (!cp1)
+		goto out;
+	cp1++;
+
+	if (strncmp(data, "TCP ", 4) == 0)
+		sock_type = SOCK_STREAM;
+	else if (strncmp(data, "UDP ", 4) == 0)
+		sock_type = SOCK_DGRAM;
+	else if (strncmp(data, "RAW ", 4) == 0)
+		sock_type = SOCK_RAW;
+	else
+		goto out;
+
+	cp2 = strchr(cp1, ' ');
+	if (!cp2)
+		goto out;
+	cp2++;
+
+	if (strncmp(cp1, "bind ", 5) == 0) {
+		switch (sock_type) {
+		case SOCK_STREAM:
+			operation = TMY_NETWORK_ACL_TCP_BIND;
+			break;
+		case SOCK_DGRAM:
+			operation = TMY_NETWORK_ACL_UDP_BIND;
+			break;
+		default:
+			operation = TMY_NETWORK_ACL_RAW_BIND;
+			break;
+		}
+	} else if (strncmp(cp1, "connect ", 8) == 0) {
+		switch (sock_type) {
+		case SOCK_STREAM:
+			operation = TMY_NETWORK_ACL_TCP_CONNECT;
+			break;
+		case SOCK_DGRAM:
+			operation = TMY_NETWORK_ACL_UDP_CONNECT;
+			break;
+		default:
+			operation = TMY_NETWORK_ACL_RAW_CONNECT;
+			break;
+		}
+	} else if (sock_type == SOCK_STREAM &&
+		   strncmp(cp1, "listen ", 7) == 0)
+		operation = TMY_NETWORK_ACL_TCP_LISTEN;
+
+	else if (sock_type == SOCK_STREAM &&
+		 strncmp(cp1, "accept ", 7) == 0)
+		operation = TMY_NETWORK_ACL_TCP_ACCEPT;
+
+	else
+		goto out;
+
+	/*** Parse port part. ***/
+	cp1 = strchr(cp2, ' ');
+	if (!cp1)
+		goto out;
+	*cp1++ = '\0';
+	if (strchr(cp1, ' '))
+		goto out;
+	count = sscanf(cp1, "%hu-%hu", &min_port, &max_port);
+	if (count != 1 && count != 2)
+		goto out;
+	if (count == 1)
+		max_port = min_port;
+
+	/*** Parse address part. ***/
+	if (*cp2 != '@')
+		goto no_address_group;
+	/* @address_group_name */
+	group = tmy_new_address_group(cp2 + 1);
+	if (!group)
+		return -ENOMEM;
+	record_type = TMY_TYPE_ADDRESS_GROUP;
+	goto ok;
+no_address_group:
+	count = strcspn(cp2, "-");
+	if (!in6_pton(cp2, count, min_address, -1, NULL))
+		goto no_ipv6;
+	/* single IPv6 or IPv6 range */
+	record_type = TMY_TYPE_IPv6;
+	cp2 += count;
+	if (*cp2++ != '-')
+		goto copy_address;
+	if (!in6_pton(cp2, -1, max_address, -1, NULL))
+		goto out;
+	goto ok;
+no_ipv6:
+	if (!in4_pton(cp2, count, min_address, -1, NULL))
+		goto out;
+	/* single IPv4 or IPv4 range */
+	record_type = TMY_TYPE_IPv4;
+	cp2 += count;
+	if (*cp2++ != '-')
+		goto copy_address;
+	if (!in4_pton(cp2, -1, max_address, -1, NULL))
+		goto out;
+	goto ok;
+copy_address:
+	memmove(max_address, min_address, sizeof(max_address));
+ok: ;
+	return tmy_add_network_entry(operation, record_type, group,
+				     min_address, max_address,
+				     min_port, max_port, domain,
+				     cond, is_delete);
+out: ;
+	return -EINVAL;
+}
+
+/**
+ * tmy_network_listen_acl - check permission for listen(2) operation.
+ * @is_ipv6: is @address an IPv6 address?
+ * @address: pointer to IPv4/IPv6 address in network byte order.
+ * @port:    TCP or UDP's port number.
+ *
+ * Returns zero if permission granted.
+ * Returns nonzero if permission denied.
+ */
+int tmy_network_listen_acl(const bool is_ipv6,
+			   const u8 *address,
+			   const u16 port)
+{
+	return tmy_network_entry(is_ipv6, TMY_NETWORK_ACL_TCP_LISTEN,
+				 address, ntohs(port));
+}
+
+/**
+ * tmy_network_connect_acl - check permission for connect(2) operation.
+ * @is_ipv6:   is @address an IPv6 address?
+ * @sock_type: socket type (TCP, UDP or IP).
+ * @address:   pointer to IPv4/IPv6 address in network byte order.
+ * @port:      TCP or UDP's port number or IP's protocol number.
+ *
+ * Returns zero if permission granted.
+ * Returns nonzero if permission denied.
+ */
+int tmy_network_connect_acl(const bool is_ipv6,
+			    const int sock_type,
+			    const u8 *address,
+			    const u16 port)
+{
+	int type;
+
+	switch (sock_type) {
+	case SOCK_STREAM:
+		type = TMY_NETWORK_ACL_TCP_CONNECT;
+		break;
+	case SOCK_DGRAM:
+		type = TMY_NETWORK_ACL_UDP_CONNECT;
+		break;
+	default:
+		type = TMY_NETWORK_ACL_RAW_CONNECT;
+		break;
+	}
+
+	return tmy_network_entry(is_ipv6, type, address, ntohs(port));
+}
+
+/**
+ * tmy_network_bind_acl - check permission for bind(2) operation.
+ * @is_ipv6:   is @address an IPv6 address?
+ * @sock_type: socket type (TCP, UDP or IP).
+ * @address:   pointer to IPv4/IPv6 address in network byte order.
+ * @port:      TCP or UDP's port number or IP's protocol number.
+ *
+ * Returns zero if permission granted.
+ * Returns nonzero if permission denied.
+ */
+int tmy_network_bind_acl(const bool is_ipv6,
+			 const int sock_type,
+			 const u8 *address,
+			 const u16 port)
+{
+	int type;
+
+	switch (sock_type) {
+	case SOCK_STREAM:
+		type = TMY_NETWORK_ACL_TCP_BIND;
+		break;
+	case SOCK_DGRAM:
+		type = TMY_NETWORK_ACL_UDP_BIND;
+		break;
+	default:
+		type = TMY_NETWORK_ACL_RAW_BIND;
+		break;
+	}
+
+	return tmy_network_entry(is_ipv6, type, address, ntohs(port));
+}
+
+/**
+ * tmy_network_sendmsg_acl - check permission for sendmsg(2) operation.
+ * @is_ipv6:   is @address an IPv6 address?
+ * @sock_type: socket type (UDP or IP).
+ * @address:   pointer to IPv4/IPv6 address in network byte order.
+ * @port:      UDP's port number or IP's protocol number.
+ *
+ * Returns zero if permission granted.
+ * Returns nonzero if permission denied.
+ */
+int tmy_network_sendmsg_acl(const bool is_ipv6,
+			    const int sock_type,
+			    const u8 *address,
+			    const u16 port)
+{
+	int type;
+
+	if (sock_type == SOCK_DGRAM)
+		type = TMY_NETWORK_ACL_UDP_CONNECT;
+	else
+		type = TMY_NETWORK_ACL_RAW_CONNECT;
+
+	return tmy_network_entry(is_ipv6, type, address, ntohs(port));
+}
+
+/**
+ * tmy_network_accept_acl - check permission for accept(2) operation.
+ * @is_ipv6:   is @address an IPv6 address?
+ * @address:   pointer to IPv4/IPv6 address in network byte order.
+ * @port:      TCP client's port number.
+ *
+ * Returns zero if permission granted.
+ * Returns nonzero if permission denied.
+ */
+int tmy_network_accept_acl(const bool is_ipv6, const u8 *address,
+			   const u16 port)
+{
+	return tmy_network_entry(is_ipv6, TMY_NETWORK_ACL_TCP_ACCEPT,
+				 address, ntohs(port));
+}
+
+/**
+ * tmy_network_recvmsg_acl - check permission for recvmsg(2) operation.
+ * @is_ipv6:   is @address an IPv6 address?
+ * @sock_type: socket type (UDP or IP).
+ * @address:   pointer to IPv4/IPv6 address in network byte order.
+ * @port:      UDP's port number or IP's protocol number.
+ *
+ * Returns zero if permission granted.
+ * Returns nonzero if permission denied.
+ */
+int tmy_network_recvmsg_acl(const bool is_ipv6, const int sock_type,
+			    const u8 *address, const u16 port)
+{
+	return tmy_network_entry(is_ipv6, sock_type == SOCK_DGRAM ?
+				 TMY_NETWORK_ACL_UDP_CONNECT :
+				 TMY_NETWORK_ACL_RAW_CONNECT,
+				 address, ntohs(port));
+}

-- 
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