ccs-patch/fs/tomoyo_network.c

/*
 * fs/tomoyo_network.c
 *
 * Implementation of the Domain-Based Mandatory Access Control.
 *
 * Copyright (C) 2005-2008  NTT DATA CORPORATION
 *
 * Version: 1.6.5-pre   2008/10/01
 *
 * This file is applicable to both 2.4.30 and 2.6.11 and later.
 * See README.ccs for ChangeLog.
 *
 */

#include <linux/ccs_common.h>
#include <linux/tomoyo.h>
#include <linux/realpath.h>
#include <linux/net.h>
#include <linux/inet.h>
#include <linux/in.h>
#include <linux/in6.h>

/**
 * audit_network_log - Audit network log.
 *
 * @is_ipv6:    True if @address is an IPv6 address.
 * @operation:  The name of operation.
 * @address:    An IPv4 or IPv6 address.
 * @port:       Port number.
 * @is_granted: True if this is a granted log.
 * @profile:    Profile number used.
 * @mode:       Access control mode used.
 *
 * Returns 0 on success, negative value otherwise.
 */
static int audit_network_log(const bool is_ipv6, const char *operation,
                             const char *address, const u16 port,
                             const bool is_granted,
                             const u8 profile, const u8 mode)
{
        char *buf;
        int len = 256;
        int len2;
        if (ccs_can_save_audit_log(is_granted) < 0)
                return -ENOMEM;
        buf = ccs_init_audit_log(&len, profile, mode, NULL);
        if (!buf)
                return -ENOMEM;
        len2 = strlen(buf);
        snprintf(buf + len2, len - len2 - 1, KEYWORD_ALLOW_NETWORK "%s %s %u\n",
                 operation, address, port);
        return ccs_write_audit_log(buf, is_granted);
}

/**
 * save_ipv6_address - Keep the given IPv6 address on the RAM.
 *
 * @addr: Pointer to "struct in6_addr".
 *
 * Returns pointer to "struct in6_addr" on success, NULL otherwise.
 *
 * The RAM is shared, so NEVER try to modify or kfree() the returned address.
 */
static const struct in6_addr *save_ipv6_address(const struct in6_addr *addr)
{
        static const u8 block_size = 16;
        struct addr_list {
                /* Workaround for gcc 4.3's bug. */
                struct in6_addr addr[16]; /* = block_size */
                struct list1_head list;
                u32 in_use_count;
        };
        static LIST1_HEAD(address_list);
        struct addr_list *ptr;
        static DEFINE_MUTEX(lock);
        u8 i = block_size;
        if (!addr)
                return NULL;
        mutex_lock(&lock);
        list1_for_each_entry(ptr, &address_list, list) {
                for (i = 0; i < ptr->in_use_count; i++) {
                        if (!memcmp(&ptr->addr[i], addr, sizeof(*addr)))
                                goto ok;
                }
                if (i < block_size)
                        break;
        }
        if (i == block_size) {
                ptr = ccs_alloc_element(sizeof(*ptr));
                if (!ptr)
                        goto ok;
                list1_add_tail_mb(&ptr->list, &address_list);
                i = 0;
        }
        ptr->addr[ptr->in_use_count++] = *addr;
 ok:
        mutex_unlock(&lock);
        return ptr ? &ptr->addr[i] : NULL;
}

/* The list for "struct address_group_entry". */
static LIST1_HEAD(address_group_list);

/**
 * update_address_group_entry - Update "struct address_group_entry" list.
 *
 * @group_name:  The name of address group.
 * @is_ipv6:     True if @min_address and @max_address are IPv6 addresses.
 * @min_address: Start of IPv4 or IPv6 address range.
 * @max_address: End of IPv4 or IPv6 address range.
 * @is_delete:   True if it is a delete request.
 *
 * Returns 0 on success, negative value otherwise.
 */
static int update_address_group_entry(const char *group_name,
                                      const bool is_ipv6,
                                      const u16 *min_address,
                                      const u16 *max_address,
                                      const bool is_delete)
{
        static DEFINE_MUTEX(lock);
        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;
        const struct in6_addr *saved_min_address = NULL;
        const struct in6_addr *saved_max_address = NULL;
        int error = -ENOMEM;
        bool found = false;
        if (!ccs_is_correct_path(group_name, 0, 0, 0, __func__) ||
            !group_name[0])
                return -EINVAL;
        saved_group_name = ccs_save_name(group_name);
        if (!saved_group_name)
                return -ENOMEM;
        if (!is_ipv6)
                goto not_ipv6;
        saved_min_address
                = save_ipv6_address((struct in6_addr *) min_address);
        saved_max_address
                = save_ipv6_address((struct in6_addr *) max_address);
        if (!saved_min_address || !saved_max_address)
                return -ENOMEM;
 not_ipv6:
        mutex_lock(&lock);
        list1_for_each_entry(group, &address_group_list, list) {
                if (saved_group_name != group->group_name)
                        continue;
                list1_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 != *(u32 *) min_address ||
                                    member->max.ipv4 != *(u32 *) max_address)
                                        continue;
                        }
                        member->is_deleted = is_delete;
                        error = 0;
                        goto out;
                }
                found = true;
                break;
        }
        if (is_delete) {
                error = -ENOENT;
                goto out;
        }
        if (!found) {
                new_group = ccs_alloc_element(sizeof(*new_group));
                if (!new_group)
                        goto out;
                INIT_LIST1_HEAD(&new_group->address_group_member_list);
                new_group->group_name = saved_group_name;
                list1_add_tail_mb(&new_group->list, &address_group_list);
                group = new_group;
        }
        new_member = ccs_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 = *(u32 *) min_address;
                new_member->max.ipv4 = *(u32 *) max_address;
        }
        list1_add_tail_mb(&new_member->list, &group->address_group_member_list);
        error = 0;
 out:
        mutex_unlock(&lock);
        ccs_update_counter(CCS_UPDATES_COUNTER_EXCEPTION_POLICY);
        return error;
}

/**
 * ccs_write_address_group_policy - Write "struct address_group_entry" list.
 *
 * @data:      String to parse.
 * @is_delete: True if it is a delete request.
 *
 * Returns 0 on success, negative value otherwise.
 */
int ccs_write_address_group_policy(char *data, const bool is_delete)
{
        u8 count;
        bool is_ipv6;
        u16 min_address[8];
        u16 max_address[8];
        char *cp = strchr(data, ' ');
        if (!cp)
                return -EINVAL;
        *cp++ = '\0';
        count = sscanf(cp, "%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx"
                       "-%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx",
                       &min_address[0], &min_address[1],
                       &min_address[2], &min_address[3],
                       &min_address[4], &min_address[5],
                       &min_address[6], &min_address[7],
                       &max_address[0], &max_address[1],
                       &max_address[2], &max_address[3],
                       &max_address[4], &max_address[5],
                       &max_address[6], &max_address[7]);
        if (count == 8 || count == 16) {
                u8 i;
                for (i = 0; i < 8; i++) {
                        min_address[i] = htons(min_address[i]);
                        max_address[i] = htons(max_address[i]);
                }
                if (count == 8)
                        memmove(max_address, min_address, sizeof(min_address));
                is_ipv6 = true;
                goto ok;
        }
        count = sscanf(cp, "%hu.%hu.%hu.%hu-%hu.%hu.%hu.%hu",
                       &min_address[0], &min_address[1],
                       &min_address[2], &min_address[3],
                       &max_address[0], &max_address[1],
                       &max_address[2], &max_address[3]);
        if (count == 4 || count == 8) {
                u32 ip = ((((u8) min_address[0]) << 24)
                          + (((u8) min_address[1]) << 16)
                          + (((u8) min_address[2]) << 8)
                          + (u8) min_address[3]);
                *(u32 *) min_address = ip;
                if (count == 8)
                        ip = ((((u8) max_address[0]) << 24)
                              + (((u8) max_address[1]) << 16)
                              + (((u8) max_address[2]) << 8)
                              + (u8) max_address[3]);
                *(u32 *) max_address = ip;
                is_ipv6 = false;
                goto ok;
        }
        return -EINVAL;
 ok:
        return update_address_group_entry(data, is_ipv6,
                                          min_address, max_address, is_delete);
}

/**
 * find_or_assign_new_address_group - Create address group.
 *
 * @group_name: The name of address group.
 *
 * Returns pointer to "struct address_group_entry" on success, NULL otherwise.
 */
static struct address_group_entry *
find_or_assign_new_address_group(const char *group_name)
{
        u8 i;
        struct address_group_entry *group;
        for (i = 0; i <= 1; i++) {
                list1_for_each_entry(group, &address_group_list, list) {
                        if (!strcmp(group_name, group->group_name->name))
                                return group;
                }
                if (!i) {
                        const u16 dummy[2] = { 0, 0 };
                        update_address_group_entry(group_name, false,
                                                   dummy, dummy, false);
                        update_address_group_entry(group_name, false,
                                                   dummy, dummy, true);
                }
        }
        return NULL;
}

/**
 * address_matches_to_group - Check whether the given address matches members of the given address group.
 *
 * @is_ipv6: True if @address is an IPv6 address.
 * @address: An IPv4 or IPv6 address.
 * @group:   Pointer to "struct address_group_entry".
 *
 * Returns true if @address matches addresses in @group group, false otherwise.
 */
static bool address_matches_to_group(const bool is_ipv6, const u32 *address,
                                     const struct address_group_entry *group)
{
        struct address_group_member *member;
        const u32 ip = ntohl(*address);
        list1_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 true;
                } else {
                        if (!is_ipv6 &&
                            member->min.ipv4 <= ip && ip <= member->max.ipv4)
                                return true;
                }
        }
        return false;
}

/**
 * ccs_read_address_group_policy - Read "struct address_group_entry" list.
 *
 * @head: Pointer to "struct ccs_io_buffer".
 *
 * Returns true on success, false otherwise.
 */
bool ccs_read_address_group_policy(struct ccs_io_buffer *head)
{
        struct list1_head *gpos;
        struct list1_head *mpos;
        list1_for_each_cookie(gpos, head->read_var1, &address_group_list) {
                struct address_group_entry *group;
                group = list1_entry(gpos, struct address_group_entry, list);
                list1_for_each_cookie(mpos, head->read_var2,
                                      &group->address_group_member_list) {
                        char buf[128];
                        struct address_group_member *member;
                        member = list1_entry(mpos, struct address_group_member,
                                             list);
                        if (member->is_deleted)
                                continue;
                        if (member->is_ipv6) {
                                const struct in6_addr *min_address
                                        = member->min.ipv6;
                                const struct in6_addr *max_address
                                        = member->max.ipv6;
                                ccs_print_ipv6(buf, sizeof(buf), min_address);
                                if (min_address != max_address) {
                                        int len;
                                        char *cp = strchr(buf, '\0');
                                        *cp++ = '-';
                                        len = strlen(buf);
                                        ccs_print_ipv6(cp, sizeof(buf) - len,
                                                       max_address);
                                }
                        } else {
                                const u32 min_address = member->min.ipv4;
                                const u32 max_address = member->max.ipv4;
                                memset(buf, 0, sizeof(buf));
                                snprintf(buf, sizeof(buf) - 1, "%u.%u.%u.%u",
                                         HIPQUAD(min_address));
                                if (min_address != max_address) {
                                        const int len = strlen(buf);
                                        snprintf(buf + len,
                                                 sizeof(buf) - 1 - len,
                                                 "-%u.%u.%u.%u",
                                                 HIPQUAD(max_address));
                                }
                        }
                        if (!ccs_io_printf(head, KEYWORD_ADDRESS_GROUP
                                           "%s %s\n", group->group_name->name,
                                           buf))
                                goto out;
                }
        }
        return true;
 out:
        return false;
}

#if !defined(NIP6)
#define NIP6(addr)      \
        ntohs((addr).s6_addr16[0]), ntohs((addr).s6_addr16[1]), \
        ntohs((addr).s6_addr16[2]), ntohs((addr).s6_addr16[3]), \
        ntohs((addr).s6_addr16[4]), ntohs((addr).s6_addr16[5]), \
        ntohs((addr).s6_addr16[6]), ntohs((addr).s6_addr16[7])
#endif

/**
 * ccs_print_ipv6 - Print an IPv6 address.
 *
 * @buffer:     Buffer to write to.
 * @buffer_len: Size of @buffer.
 * @ip:         Pointer to "struct in6_addr".
 *
 * Returns nothing.
 */
void ccs_print_ipv6(char *buffer, const int buffer_len,
                    const struct in6_addr *ip)
{
        memset(buffer, 0, buffer_len);
        snprintf(buffer, buffer_len - 1, "%x:%x:%x:%x:%x:%x:%x:%x", NIP6(*ip));
}

/**
 * ccs_net2keyword - Convert network operation index to network operation name.
 *
 * @operation: Type of operation.
 *
 * Returns the name of operation.
 */
const char *ccs_net2keyword(const u8 operation)
{
        const char *keyword = "unknown";
        switch (operation) {
        case NETWORK_ACL_UDP_BIND:
                keyword = "UDP bind";
                break;
        case NETWORK_ACL_UDP_CONNECT:
                keyword = "UDP connect";
                break;
        case NETWORK_ACL_TCP_BIND:
                keyword = "TCP bind";
                break;
        case NETWORK_ACL_TCP_LISTEN:
                keyword = "TCP listen";
                break;
        case NETWORK_ACL_TCP_CONNECT:
                keyword = "TCP connect";
                break;
        case NETWORK_ACL_TCP_ACCEPT:
                keyword = "TCP accept";
                break;
        case NETWORK_ACL_RAW_BIND:
                keyword = "RAW bind";
                break;
        case NETWORK_ACL_RAW_CONNECT:
                keyword = "RAW connect";
                break;
        }
        return keyword;
}

/**
 * update_network_entry - Update "struct ip_network_acl_record" list.
 *
 * @operation:   Type of operation.
 * @record_type: Type of address.
 * @group:       Pointer to "struct address_group_entry". May be NULL.
 * @min_address: Start of IPv4 or IPv6 address range.
 * @max_address: End of IPv4 or IPv6 address range.
 * @min_port:    Start of port number range.
 * @max_port:    End of port number range.
 * @domain:      Pointer to "struct domain_info".
 * @condition:   Pointer to "struct condition_list". May be NULL.
 * @is_delete:   True if it is a delete request.
 *
 * Returns 0 on success, negative value otherwise.
 */
static int update_network_entry(const u8 operation, const u8 record_type,
                                const struct address_group_entry *group,
                                const u32 *min_address, const u32 *max_address,
                                const u16 min_port, const u16 max_port,
                                struct domain_info *domain,
                                const struct condition_list *condition,
                                const bool is_delete)
{
        struct acl_info *ptr;
        struct ip_network_acl_record *acl;
        int error = -ENOMEM;
        /* using host byte order to allow u32 comparison than memcmp().*/
        const u32 min_ip = ntohl(*min_address);
        const u32 max_ip = ntohl(*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 != IP_RECORD_TYPE_IPv6)
                goto not_ipv6;
        saved_min_address = save_ipv6_address((struct in6_addr *) min_address);
        saved_max_address = save_ipv6_address((struct in6_addr *) max_address);
        if (!saved_min_address || !saved_max_address)
                return -ENOMEM;
 not_ipv6:
        mutex_lock(&domain_acl_lock);
        if (is_delete)
                goto delete;
        list1_for_each_entry(ptr, &domain->acl_info_list, list) {
                if (ccs_acl_type1(ptr) != TYPE_IP_NETWORK_ACL)
                        continue;
                if (ccs_get_condition_part(ptr) != condition)
                        continue;
                acl = container_of(ptr, struct ip_network_acl_record, head);
                if (acl->operation_type != operation ||
                    acl->record_type != record_type ||
                    acl->min_port != min_port || max_port != acl->max_port)
                        continue;
                if (record_type == IP_RECORD_TYPE_ADDRESS_GROUP) {
                        if (acl->u.group != group)
                                continue;
                } else if (record_type == IP_RECORD_TYPE_IPv4) {
                        if (acl->u.ipv4.min != min_ip ||
                            max_ip != acl->u.ipv4.max)
                                continue;
                } else if (record_type == IP_RECORD_TYPE_IPv6) {
                        if (acl->u.ipv6.min != saved_min_address ||
                            saved_max_address != acl->u.ipv6.max)
                                continue;
                }
                error = ccs_add_domain_acl(NULL, ptr);
                goto out;
        }
        /* Not found. Append it to the tail. */
        acl = ccs_alloc_acl_element(TYPE_IP_NETWORK_ACL, condition);
        if (!acl)
                goto out;
        acl->operation_type = operation;
        acl->record_type = record_type;
        if (record_type == IP_RECORD_TYPE_ADDRESS_GROUP) {
                acl->u.group = group;
        } else if (record_type == IP_RECORD_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 = ccs_add_domain_acl(domain, &acl->head);
        goto out;
 delete:
        error = -ENOENT;
        list1_for_each_entry(ptr, &domain->acl_info_list, list) {
                if (ccs_acl_type2(ptr) != TYPE_IP_NETWORK_ACL)
                        continue;
                if (ccs_get_condition_part(ptr) != condition)
                        continue;
                acl = container_of(ptr, struct ip_network_acl_record, head);
                if (acl->operation_type != operation ||
                    acl->record_type != record_type ||
                    acl->min_port != min_port || max_port != acl->max_port)
                        continue;
                if (record_type == IP_RECORD_TYPE_ADDRESS_GROUP) {
                        if (acl->u.group != group)
                                continue;
                } else if (record_type == IP_RECORD_TYPE_IPv4) {
                        if (acl->u.ipv4.min != min_ip ||
                            max_ip != acl->u.ipv4.max)
                                continue;
                } else if (record_type == IP_RECORD_TYPE_IPv6) {
                        if (acl->u.ipv6.min != saved_min_address ||
                            saved_max_address != acl->u.ipv6.max)
                                continue;
                }
                error = ccs_del_domain_acl(ptr);
                break;
        }
 out:
        mutex_unlock(&domain_acl_lock);
        return error;
}

/**
 * check_network_entry - Check permission for network operation.
 *
 * @is_ipv6:   True if @address is an IPv6 address.
 * @operation: Type of operation.
 * @address:   An IPv4 or IPv6 address.
 * @port:      Port number.
 *
 * Returns 0 on success, negative value otherwise.
 */
static int check_network_entry(const bool is_ipv6, const u8 operation,
                               const u32 *address, const u16 port)
{
        unsigned short int retries = 0;
        struct domain_info * const domain = current->domain_info;
        struct acl_info *ptr;
        const char *keyword = ccs_net2keyword(operation);
        const u8 profile = current->domain_info->profile;
        const u8 mode = ccs_check_flags(CCS_TOMOYO_MAC_FOR_NETWORK);
        const bool is_enforce = (mode == 3);
        /* using host byte order to allow u32 comparison than memcmp().*/
        const u32 ip = ntohl(*address);
        bool found = false;
        char buf[64];
        if (!mode)
                return 0;
retry:
        list1_for_each_entry(ptr, &domain->acl_info_list, list) {
                struct ip_network_acl_record *acl;
                if (ccs_acl_type2(ptr) != TYPE_IP_NETWORK_ACL)
                        continue;
                acl = container_of(ptr, struct ip_network_acl_record, head);
                if (acl->operation_type != operation || port < acl->min_port ||
                    acl->max_port < port || !ccs_check_condition(ptr, NULL))
                        continue;
                if (acl->record_type == IP_RECORD_TYPE_ADDRESS_GROUP) {
                        if (!address_matches_to_group(is_ipv6, address,
                                                      acl->u.group))
                                continue;
                } else if (acl->record_type == IP_RECORD_TYPE_IPv4) {
                        if (is_ipv6 ||
                            ip < acl->u.ipv4.min || acl->u.ipv4.max < ip)
                                continue;
                } else {
                        if (!is_ipv6 ||
                            memcmp(acl->u.ipv6.min, address, 16) > 0 ||
                            memcmp(address, acl->u.ipv6.max, 16) > 0)
                                continue;
                }
                ccs_update_condition(ptr);
                found = true;
                break;
        }
        memset(buf, 0, sizeof(buf));
        if (is_ipv6)
                ccs_print_ipv6(buf, sizeof(buf),
                               (const struct in6_addr *) address);
        else
                snprintf(buf, sizeof(buf) - 1, "%u.%u.%u.%u", HIPQUAD(ip));
        audit_network_log(is_ipv6, keyword, buf, port, found, profile, mode);
        if (found)
                return 0;
        if (ccs_verbose_mode())
                printk(KERN_WARNING "TOMOYO-%s: %s to %s %u denied for %s\n",
                       ccs_get_msg(is_enforce), keyword, buf, port,
                       ccs_get_last_name(domain));
        if (is_enforce) {
                int error = ccs_check_supervisor(retries, NULL,
                                                 KEYWORD_ALLOW_NETWORK
                                                 "%s %s %u\n", keyword, buf,
                                                 port);
                if (error == 1) {
                        retries++;
                        goto retry;
                }
                return error;
        }
        if (mode == 1 && ccs_check_domain_quota(domain))
                update_network_entry(operation, is_ipv6 ?
                                     IP_RECORD_TYPE_IPv6 : IP_RECORD_TYPE_IPv4,
                                     NULL, address, address, port, port, domain,
                                     NULL, 0);
        return 0;
}

/**
 * ccs_write_network_policy - Write "struct ip_network_acl_record" list.
 *
 * @data:      String to parse.
 * @domain:    Pointer to "struct domain_info".
 * @condition: Pointer to "struct condition_list". May be NULL.
 * @is_delete: True if it is a delete request.
 *
 * Returns 0 on success, negative value otherwise.
 */
int ccs_write_network_policy(char *data, struct domain_info *domain,
                             const struct condition_list *condition,
                             const bool is_delete)
{
        u8 sock_type;
        u8 operation;
        u8 record_type;
        u16 min_address[8];
        u16 max_address[8];
        struct address_group_entry *group = NULL;
        u16 min_port;
        u16 max_port;
        u8 count;
        char *cp1 = strchr(data, ' ');
        char *cp2;
        if (!cp1)
                goto out;
        cp1++;
        if (!strncmp(data, "TCP ", 4))
                sock_type = SOCK_STREAM;
        else if (!strncmp(data, "UDP ", 4))
                sock_type = SOCK_DGRAM;
        else if (!strncmp(data, "RAW ", 4))
                sock_type = SOCK_RAW;
        else
                goto out;
        cp2 = strchr(cp1, ' ');
        if (!cp2)
                goto out;
        cp2++;
        if (!strncmp(cp1, "bind ", 5))
                switch (sock_type) {
                case SOCK_STREAM:
                        operation = NETWORK_ACL_TCP_BIND;
                        break;
                case SOCK_DGRAM:
                        operation = NETWORK_ACL_UDP_BIND;
                        break;
                default:
                        operation = NETWORK_ACL_RAW_BIND;
                }
        else if (!strncmp(cp1, "connect ", 8))
                switch (sock_type) {
                case SOCK_STREAM:
                        operation = NETWORK_ACL_TCP_CONNECT;
                        break;
                case SOCK_DGRAM:
                        operation = NETWORK_ACL_UDP_CONNECT;
                        break;
                default:
                        operation = NETWORK_ACL_RAW_CONNECT;
                }
        else if (sock_type == SOCK_STREAM && !strncmp(cp1, "listen ", 7))
                operation = NETWORK_ACL_TCP_LISTEN;
        else if (sock_type == SOCK_STREAM && !strncmp(cp1, "accept ", 7))
                operation = NETWORK_ACL_TCP_ACCEPT;
        else
                goto out;
        cp1 = strchr(cp2, ' ');
        if (!cp1)
                goto out;
        *cp1++ = '\0';
        count = sscanf(cp2, "%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx"
                       "-%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx",
                       &min_address[0], &min_address[1],
                       &min_address[2], &min_address[3],
                       &min_address[4], &min_address[5],
                       &min_address[6], &min_address[7],
                       &max_address[0], &max_address[1],
                       &max_address[2], &max_address[3],
                       &max_address[4], &max_address[5],
                       &max_address[6], &max_address[7]);
        if (count == 8 || count == 16) {
                u8 i;
                for (i = 0; i < 8; i++) {
                        min_address[i] = htons(min_address[i]);
                        max_address[i] = htons(max_address[i]);
                }
                if (count == 8)
                        memmove(max_address, min_address, sizeof(min_address));
                record_type = IP_RECORD_TYPE_IPv6;
                goto ok;
        }
        count = sscanf(cp2, "%hu.%hu.%hu.%hu-%hu.%hu.%hu.%hu",
                       &min_address[0], &min_address[1],
                       &min_address[2], &min_address[3],
                       &max_address[0], &max_address[1],
                       &max_address[2], &max_address[3]);
        if (count == 4 || count == 8) {
                u32 ip = htonl((((u8) min_address[0]) << 24)
                               + (((u8) min_address[1]) << 16)
                               + (((u8) min_address[2]) << 8)
                               + (u8) min_address[3]);
                *(u32 *) min_address = ip;
                if (count == 8)
                        ip = htonl((((u8) max_address[0]) << 24)
                                   + (((u8) max_address[1]) << 16)
                                   + (((u8) max_address[2]) << 8)
                                   + (u8) max_address[3]);
                *(u32 *) max_address = ip;
                record_type = IP_RECORD_TYPE_IPv4;
                goto ok;
        }
        if (*cp2 == '@') {
                group = find_or_assign_new_address_group(cp2 + 1);
                if (!group)
                        return -ENOMEM;
                record_type = IP_RECORD_TYPE_ADDRESS_GROUP;
                goto ok;
        }
 out:
        return -EINVAL;
 ok:
        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;
        return update_network_entry(operation, record_type, group,
                                    (u32 *) min_address, (u32 *) max_address,
                                    min_port, max_port, domain, condition,
                                    is_delete);
}

/**
 * ccs_check_network_listen_acl - Check permission for listen() operation.
 *
 * @is_ipv6: True if @address is an IPv6 address.
 * @address: An IPv4 or IPv6 address.
 * @port:    Port number.
 *
 * Returns 0 on success, negative value otherwise.
 */
int ccs_check_network_listen_acl(const _Bool is_ipv6, const u8 *address,
                                 const u16 port)
{
        return check_network_entry(is_ipv6, NETWORK_ACL_TCP_LISTEN,
                                   (const u32 *) address, ntohs(port));
}

/**
 * ccs_check_network_connect_acl - Check permission for connect() operation.
 *
 * @is_ipv6:   True if @address is an IPv6 address.
 * @sock_type: Type of socket. (TCP or UDP or RAW)
 * @address:   An IPv4 or IPv6 address.
 * @port:      Port number.
 *
 * Returns 0 on success, negative value otherwise.
 */
int ccs_check_network_connect_acl(const _Bool is_ipv6, const int sock_type,
                                  const u8 *address, const u16 port)
{
        u8 operation;
        switch (sock_type) {
        case SOCK_STREAM:
                operation = NETWORK_ACL_TCP_CONNECT;
                break;
        case SOCK_DGRAM:
                operation = NETWORK_ACL_UDP_CONNECT;
                break;
        default:
                operation = NETWORK_ACL_RAW_CONNECT;
        }
        return check_network_entry(is_ipv6, operation, (const u32 *) address,
                                   ntohs(port));
}

/**
 * ccs_check_network_bind_acl - Check permission for bind() operation.
 *
 * @is_ipv6:   True if @address is an IPv6 address.
 * @sock_type: Type of socket. (TCP or UDP or RAW)
 * @address:   An IPv4 or IPv6 address.
 * @port:      Port number.
 *
 * Returns 0 on success, negative value otherwise.
 */
int ccs_check_network_bind_acl(const _Bool is_ipv6, const int sock_type,
                               const u8 *address, const u16 port)
{
        u8 operation;
        switch (sock_type) {
        case SOCK_STREAM:
                operation = NETWORK_ACL_TCP_BIND;
                break;
        case SOCK_DGRAM:
                operation = NETWORK_ACL_UDP_BIND;
                break;
        default:
                operation = NETWORK_ACL_RAW_BIND;
        }
        return check_network_entry(is_ipv6, operation, (const u32 *) address,
                                   ntohs(port));
}

/**
 * ccs_check_network_accept_acl - Check permission for accept() operation.
 *
 * @is_ipv6: True if @address is an IPv6 address.
 * @address: An IPv4 or IPv6 address.
 * @port:    Port number.
 *
 * Returns 0 on success, negative value otherwise.
 */
int ccs_check_network_accept_acl(const _Bool is_ipv6, const u8 *address,
                                 const u16 port)
{
        int retval;
        current->tomoyo_flags |= CCS_DONT_SLEEP_ON_ENFORCE_ERROR;
        retval = check_network_entry(is_ipv6, NETWORK_ACL_TCP_ACCEPT,
                                     (const u32 *) address, ntohs(port));
        current->tomoyo_flags &= ~CCS_DONT_SLEEP_ON_ENFORCE_ERROR;
        return retval;
}

/**
 * ccs_check_network_sendmsg_acl - Check permission for sendmsg() operation.
 *
 * @is_ipv6:   True if @address is an IPv6 address.
 * @sock_type: Type of socket. (UDP or RAW)
 * @address:   An IPv4 or IPv6 address.
 * @port:      Port number.
 *
 * Returns 0 on success, negative value otherwise.
 */
int ccs_check_network_sendmsg_acl(const _Bool is_ipv6, const int sock_type,
                                  const u8 *address, const u16 port)
{
        u8 operation;
        if (sock_type == SOCK_DGRAM)
                operation = NETWORK_ACL_UDP_CONNECT;
        else
                operation = NETWORK_ACL_RAW_CONNECT;
        return check_network_entry(is_ipv6, operation, (const u32 *) address,
                                   ntohs(port));
}

/**
 * ccs_check_network_recvmsg_acl - Check permission for recvmsg() operation.
 *
 * @is_ipv6:   True if @address is an IPv6 address.
 * @sock_type: Type of socket. (UDP or RAW)
 * @address:   An IPv4 or IPv6 address.
 * @port:      Port number.
 *
 * Returns 0 on success, negative value otherwise.
 */
int ccs_check_network_recvmsg_acl(const _Bool is_ipv6, const int sock_type,
                                  const u8 *address, const u16 port)
{
        int retval;
        const u8 operation
                = (sock_type == SOCK_DGRAM) ?
                NETWORK_ACL_UDP_CONNECT : NETWORK_ACL_RAW_CONNECT;
        current->tomoyo_flags |= CCS_DONT_SLEEP_ON_ENFORCE_ERROR;
        retval = check_network_entry(is_ipv6, operation, (const u32 *) address,
                                     ntohs(port));
        current->tomoyo_flags &= ~CCS_DONT_SLEEP_ON_ENFORCE_ERROR;
        return retval;
}