/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/

/***
  This file is part of systemd.

  Copyright 2013 Tom Gundersen <teg@jklm.no>

  systemd is free software; you can redistribute it and/or modify it
  under the terms of the GNU Lesser General Public License as published by
  the Free Software Foundation; either version 2.1 of the License, or
  (at your option) any later version.

  systemd 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
  Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public License
  along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/

#pragma once

#include <arpa/inet.h>

#include "sd-event.h"
#include "sd-rtnl.h"
#include "sd-bus.h"
#include "sd-dhcp-client.h"
#include "sd-dhcp-server.h"
#include "sd-ipv4ll.h"
#include "sd-icmp6-nd.h"
#include "sd-dhcp6-client.h"
#include "udev.h"

#include "rtnl-util.h"
#include "hashmap.h"
#include "list.h"
#include "set.h"
#include "condition-util.h"
#include "in-addr-util.h"

#define CACHE_INFO_INFINITY_LIFE_TIME 0xFFFFFFFFU
#define DHCP_ROUTE_METRIC 1024
#define IPV4LL_ROUTE_METRIC 2048

typedef struct NetDev NetDev;
typedef struct Network Network;
typedef struct Link Link;
typedef struct Address Address;
typedef struct Route Route;
typedef struct Manager Manager;
typedef struct AddressPool AddressPool;

typedef enum DHCPSupport {
        DHCP_SUPPORT_NONE,
        DHCP_SUPPORT_BOTH,
        DHCP_SUPPORT_V4,
        DHCP_SUPPORT_V6,
        _DHCP_SUPPORT_MAX,
        _DHCP_SUPPORT_INVALID = -1,
} DHCPSupport;

struct Network {
        Manager *manager;

        char *filename;

        struct ether_addr *match_mac;
        char *match_path;
        char *match_driver;
        char *match_type;
        char *match_name;
        char *dhcp_vendor_class_identifier;

        Condition *match_host;
        Condition *match_virt;
        Condition *match_kernel;
        Condition *match_arch;

        char *description;
        NetDev *bridge;
        NetDev *bond;
        Hashmap *stacked_netdevs;
        DHCPSupport dhcp;
        bool dhcp_dns;
        bool dhcp_ntp;
        bool dhcp_mtu;
        bool dhcp_hostname;
        bool dhcp_domainname;
        bool dhcp_sendhost;
        bool dhcp_broadcast;
        bool dhcp_critical;
        bool dhcp_routes;
        bool ipv4ll;
        bool ipv4ll_route;

        bool dhcp_server;

        LIST_HEAD(Address, static_addresses);
        LIST_HEAD(Route, static_routes);

        Hashmap *addresses_by_section;
        Hashmap *routes_by_section;

        char **dns, **ntp;

        LIST_FIELDS(Network, networks);
};

struct Address {
        Network *network;
        uint64_t section;

        int family;
        unsigned char prefixlen;
        unsigned char scope;
        char *label;

        struct in_addr broadcast;
        struct ifa_cacheinfo cinfo;

        union in_addr_union in_addr;
        union in_addr_union in_addr_peer;

        LIST_FIELDS(Address, addresses);
};

struct Route {
        Network *network;
        uint64_t section;

        int family;
        unsigned char dst_prefixlen;
        unsigned char scope;
        uint32_t metrics;
        unsigned char protocol;  /* RTPROT_* */

        union in_addr_union in_addr;
        union in_addr_union dst_addr;

        LIST_FIELDS(Route, routes);
};

typedef enum LinkState {
        LINK_STATE_INITIALIZING,
        LINK_STATE_ENSLAVING,
        LINK_STATE_SETTING_ADDRESSES,
        LINK_STATE_SETTING_ROUTES,
        LINK_STATE_CONFIGURED,
        LINK_STATE_UNMANAGED,
        LINK_STATE_FAILED,
        LINK_STATE_LINGER,
        _LINK_STATE_MAX,
        _LINK_STATE_INVALID = -1
} LinkState;

typedef enum LinkOperationalState {
        LINK_OPERSTATE_UNKNOWN,
        LINK_OPERSTATE_DORMANT,
        LINK_OPERSTATE_CARRIER,
        LINK_OPERSTATE_DEGRADED,
        LINK_OPERSTATE_ROUTABLE,
        _LINK_OPERSTATE_MAX,
        _LINK_OPERSTATE_INVALID = -1
} LinkOperationalState;

struct Link {
        Manager *manager;

        int n_ref;

        int ifindex;
        char *ifname;
        char *state_file;
        struct ether_addr mac;
        struct udev_device *udev_device;

        unsigned flags;
        uint8_t kernel_operstate;

        Network *network;

        LinkState state;
        LinkOperationalState operstate;

        unsigned addr_messages;
        unsigned route_messages;
        unsigned enslaving;

        LIST_HEAD(Address, addresses);

        sd_dhcp_client *dhcp_client;
        sd_dhcp_lease *dhcp_lease;
        char *lease_file;
        uint16_t original_mtu;
        sd_ipv4ll *ipv4ll;

        LIST_HEAD(Address, pool_addresses);

        sd_dhcp_server *dhcp_server;

        sd_icmp6_nd *icmp6_router_discovery;
        sd_dhcp6_client *dhcp6_client;
};

struct AddressPool {
        Manager *manager;

        int family;
        unsigned prefixlen;

        union in_addr_union in_addr;

        LIST_FIELDS(AddressPool, address_pools);
};

struct Manager {
        sd_rtnl *rtnl;
        sd_event *event;
        sd_bus *bus;
        struct udev *udev;
        struct udev_monitor *udev_monitor;
        sd_event_source *udev_event_source;
        sd_event_source *sigterm_event_source;
        sd_event_source *sigint_event_source;

        char *state_file;

        Hashmap *links;
        Hashmap *netdevs;
        LIST_HEAD(Network, networks);
        LIST_HEAD(AddressPool, address_pools);

        usec_t network_dirs_ts_usec;
};

extern const char* const network_dirs[];

/* Manager */

int manager_new(Manager **ret);
void manager_free(Manager *m);

int manager_load_config(Manager *m);
bool manager_should_reload(Manager *m);

int manager_rtnl_enumerate_links(Manager *m);

int manager_rtnl_listen(Manager *m);
int manager_udev_listen(Manager *m);
int manager_bus_listen(Manager *m);

int manager_save(Manager *m);

int manager_address_pool_acquire(Manager *m, int family, unsigned prefixlen, union in_addr_union *found);

DEFINE_TRIVIAL_CLEANUP_FUNC(Manager*, manager_free);
#define _cleanup_manager_free_ _cleanup_(manager_freep)

/* Network */

int network_load(Manager *manager);

void network_free(Network *network);

DEFINE_TRIVIAL_CLEANUP_FUNC(Network*, network_free);
#define _cleanup_network_free_ _cleanup_(network_freep)

int network_get(Manager *manager, struct udev_device *device,
                const char *ifname, const struct ether_addr *mac,
                Network **ret);
int network_apply(Manager *manager, Network *network, Link *link);

int config_parse_netdev(const char *unit, const char *filename, unsigned line,
                        const char *section, unsigned section_line, const char *lvalue,
                        int ltype, const char *rvalue, void *data, void *userdata);

int config_parse_tunnel(const char *unit,
                        const char *filename,
                        unsigned line,
                        const char *section,
                        unsigned section_line,
                        const char *lvalue,
                        int ltype,
                        const char *rvalue,
                        void *data,
                        void *userdata);

int config_parse_tunnel_address(const char *unit,
                                const char *filename,
                                unsigned line,
                                const char *section,
                                unsigned section_line,
                                const char *lvalue,
                                int ltype,
                                const char *rvalue,
                                void *data,
                                void *userdata);

/* gperf */
const struct ConfigPerfItem* network_network_gperf_lookup(const char *key, unsigned length);

/* Route */
int route_new_static(Network *network, unsigned section, Route **ret);
int route_new_dynamic(Route **ret, unsigned char rtm_protocol);
void route_free(Route *route);
int route_configure(Route *route, Link *link, sd_rtnl_message_handler_t callback);
int route_drop(Route *route, Link *link, sd_rtnl_message_handler_t callback);


DEFINE_TRIVIAL_CLEANUP_FUNC(Route*, route_free);
#define _cleanup_route_free_ _cleanup_(route_freep)

int config_parse_gateway(const char *unit, const char *filename, unsigned line,
                         const char *section, unsigned section_line, const char *lvalue,
                         int ltype, const char *rvalue, void *data, void *userdata);

int config_parse_destination(const char *unit, const char *filename, unsigned line,
                             const char *section, unsigned section_line, const char *lvalue,
                             int ltype, const char *rvalue, void *data, void *userdata);

int config_parse_route_priority(const char *unit, const char *filename, unsigned line,
                                const char *section, unsigned section_line, const char *lvalue,
                                int ltype, const char *rvalue, void *data, void *userdata);
/* Address */
int address_new_static(Network *network, unsigned section, Address **ret);
int address_new_dynamic(Address **ret);
void address_free(Address *address);
int address_configure(Address *address, Link *link, sd_rtnl_message_handler_t callback);
int address_update(Address *address, Link *link, sd_rtnl_message_handler_t callback);
int address_drop(Address *address, Link *link, sd_rtnl_message_handler_t callback);
bool address_equal(Address *a1, Address *a2);

DEFINE_TRIVIAL_CLEANUP_FUNC(Address*, address_free);
#define _cleanup_address_free_ _cleanup_(address_freep)

int config_parse_address(const char *unit, const char *filename, unsigned line,
                         const char *section, unsigned section_line, const char *lvalue,
                         int ltype, const char *rvalue, void *data, void *userdata);

int config_parse_broadcast(const char *unit, const char *filename, unsigned line,
                           const char *section, unsigned section_line, const char *lvalue,
                           int ltype, const char *rvalue, void *data, void *userdata);

int config_parse_label(const char *unit, const char *filename, unsigned line,
                       const char *section, unsigned section_line, const char *lvalue,
                       int ltype, const char *rvalue, void *data, void *userdata);

/* Link */

Link *link_unref(Link *link);
Link *link_ref(Link *link);
int link_get(Manager *m, int ifindex, Link **ret);
int link_add(Manager *manager, sd_rtnl_message *message, Link **ret);
void link_drop(Link *link);

int link_update(Link *link, sd_rtnl_message *message);
int link_rtnl_process_address(sd_rtnl *rtnl, sd_rtnl_message *message, void *userdata);

int link_initialized(Link *link, struct udev_device *device);

int link_save(Link *link);

bool link_has_carrier(unsigned flags, uint8_t operstate);

const char* link_state_to_string(LinkState s) _const_;
LinkState link_state_from_string(const char *s) _pure_;

const char* link_operstate_to_string(LinkOperationalState s) _const_;
LinkOperationalState link_operstate_from_string(const char *s) _pure_;

DEFINE_TRIVIAL_CLEANUP_FUNC(Link*, link_unref);
#define _cleanup_link_unref_ _cleanup_(link_unrefp)

/* DHCP support */

const char* dhcp_support_to_string(DHCPSupport i) _const_;
DHCPSupport dhcp_support_from_string(const char *s) _pure_;

int config_parse_dhcp(const char *unit, const char *filename, unsigned line,
                      const char *section, unsigned section_line, const char *lvalue,
                      int ltype, const char *rvalue, void *data, void *userdata);

/* Address Pool */

int address_pool_new(Manager *m, AddressPool **ret, int family, const union in_addr_union *u, unsigned prefixlen);
int address_pool_new_from_string(Manager *m, AddressPool **ret, int family, const char *p, unsigned prefixlen);
void address_pool_free(AddressPool *p);

int address_pool_acquire(AddressPool *p, unsigned prefixlen, union in_addr_union *found);

/* Macros which append INTERFACE= to the message */

#define log_full_link(level, link, fmt, ...) log_meta_object(level, __FILE__, __LINE__, __func__, "INTERFACE=", link->ifname, "%-*s: " fmt, IFNAMSIZ, link->ifname, ##__VA_ARGS__)
#define log_debug_link(link, ...)       log_full_link(LOG_DEBUG, link, ##__VA_ARGS__)
#define log_info_link(link, ...)        log_full_link(LOG_INFO, link, ##__VA_ARGS__)
#define log_notice_link(link, ...)      log_full_link(LOG_NOTICE, link, ##__VA_ARGS__)
#define log_warning_link(link, ...)     log_full_link(LOG_WARNING, link, ##__VA_ARGS__)
#define log_error_link(link, ...)       log_full_link(LOG_ERR, link, ##__VA_ARGS__)

#define log_struct_link(level, link, ...) log_struct(level, "INTERFACE=%s", link->ifname, __VA_ARGS__)

#define ADDRESS_FMT_VAL(address)            \
        (address).s_addr & 0xFF,            \
        ((address).s_addr >> 8) & 0xFF,     \
        ((address).s_addr >> 16) & 0xFF,    \
        (address).s_addr >> 24