NetworkInador/src/common.h

/*
 * common.h
 * This file is part of Network-inador
 *
 * Copyright (C) 2019, 2020 - Félix Arreola Rodríguez
 *
 * Network-inador 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.
 *
 * Network-inador 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 Network-inador; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, 
 * Boston, MA  02110-1301  USA
 */

#ifndef __COMMON_H__
#define __COMMON_H__

#include <stdint.h>
#include <time.h>

#include <netinet/in.h>
#include <net/ethernet.h>
#include <linux/if.h>

#include <glib.h>
#include <gmodule.h>

#ifndef FALSE
#define FALSE 0
#endif

#ifndef TRUE
#define TRUE !FALSE
#endif

#ifndef INFINITY_LIFE_TIME
#define     INFINITY_LIFE_TIME      0xFFFFFFFFU
#endif

#define container_of(ptr, type, member) ({                      \
        const typeof( ((type *)0)->member ) *__mptr = (ptr);    \
        (type *)( (char *)__mptr - offsetof(type,member) );})

typedef struct _NetworkInadorHandle NetworkInadorHandle;
typedef struct _NetworkInadorManager NetworkInadorManager;
typedef struct _Interface Interface;

typedef union {
	struct in_addr v4;
	struct in6_addr v6;
} struct_addr;

typedef struct _IPAddr {
	sa_family_t family;
	
	uint8_t prefix;
	struct_addr local_addr;
	struct_addr addr;
	struct_addr brd_addr;
	
	char label[256];
	struct ifa_cacheinfo cacheinfo;
	
	uint8_t is_p2p;
	uint8_t has_brd;
	uint8_t has_local;
	
	uint32_t flags;
	uint8_t scope;
	
	Interface *iface;
} IPAddr;

#define SSID_MAX_LEN 32

typedef struct _WirelessBSS {
	/** Number of counts without seeing this BSS */
	unsigned int scan_miss_count;
	/** Index of the last scan update */
	unsigned int last_update_idx;
	
	/** BSSID */
	uint8_t bssid[ETHER_ADDR_LEN * 2 + 1];
	/** HESSID */
	//u8 hessid[ETHER_ADDR_LEN * 2 + 1];
	/** SSID */
	uint8_t ssid[SSID_MAX_LEN];
	/** Length of SSID */
	size_t ssid_len;
	/** Frequency of the channel in MHz (e.g., 2412 = channel 1) */
	int freq;
	/** Capability information field in host byte order */
	uint16_t caps;
	/** Timestamp of last Beacon/Probe Response frame */
	uint64_t tsf;
	/** Time of the last update (i.e., Beacon or Probe Response RX) */
	struct timespec last_update;
} WirelessBSS;

typedef struct _WirelessInfo {
	int phy;
	uint32_t *freqs;
	int num_freqs;
	uint32_t caps;
	gboolean can_scan;
	gboolean can_scan_ssid;
	gboolean supported;
	
	unsigned int bss_update_idx;
	GList *aps;
} WirelessInfo;

/* Información del proceso de DHCP */
enum {
	IFACE_NO_DHCP = 0,
	IFACE_ISC_DHCLIENT,
	IFACE_BUSYBOX_UDHCPC
};

/* FIXME: Revisar estos estados */
enum {
	DHCP_CLIENT_SELECTING,
	DHCP_CLIENT_BOUND,
	DHCP_CLIENT_RENEWED,
	
	DHCP_CLIENT_EXPIRED,
	DHCP_CLIENT_FAILED,
	
	DHCP_CLIENT_KILLED,
};

#define DHCP_CLIENT_FLAG_AUTO_RESTART	0x0001

typedef struct _InterfaceDHCPClientInfo {
	int type;
	
	uint32_t flags;
	int dhcp_state;
	
	/* Para vigilar el proceso */
	GPid process_pid;
	guint process_watch;
	
	/* La información obtenida desde el cliente */
	struct_addr ip, broadcast;
	struct_addr gateways[7], dns[7];
	char domain_name[256];
	int gw_c, dns_c;
	int prefix;
	
	struct_addr dhcp_server_ip;
	uint32_t lease_time;
} InterfaceDHCPClientInfo;

struct _Interface {
	NetworkInadorHandle *handle;
	uint32_t index;
	char name[IFNAMSIZ];
	uint32_t link_type;
	uint16_t arp_type;
	unsigned char real_hw[ETHER_ADDR_LEN * 2 + 1];
	
	/* Para las interfaces dentro de un bridge */
	uint32_t master_index;
	
	uint32_t mtu;
	
	/* Para las interfaces vlan */
	unsigned int vlan_parent;
	
	/* Banderas estilo ioctl */
	short flags;
	
	int is_wireless;
	
	char wireless_protocol[IFNAMSIZ];
	
	/* Tipo */
	char rtnl_type[IFNAMSIZ];
	
	GList *address;
	
	InterfaceDHCPClientInfo dhcpc;
	
	/* Información wireless */
	WirelessInfo *wireless;
};

/* Para los clientes y sus respectivos eventos */
typedef struct {
	int fd;
	
	/* Los eventos que quieren ser recibidos en este cliente */
	uint32_t wanted_events;
	guint source;
	NetworkInadorManager *manager;
} ManagerClientInfo;

struct _NetworkInadorManager {
	int socket;
	
	guint source;
	GList *connected_client_list;
	NetworkInadorHandle *handle;
};

/* Para vigilar eventos */
typedef struct _netlink_event_pair {
	struct nl_sock * nl_sock;
	guint source;
} NetlinkEventPair;

typedef struct _RouteNH {
	struct_addr gw;
	uint32_t out_index;
	uint8_t nh_weight;
	uint8_t nh_flags;
} RouteNH;

/* La tabla de ruteo */
typedef struct _Route {
	sa_family_t family; /* AF_INET, AF_INET6 */
	
	uint8_t type; /* Unicast, local, broadcast, etc... */
	uint32_t table;
	struct_addr dest;
	uint8_t prefix;
	
	uint8_t protocol;
	uint8_t tos;
	uint8_t scope;
	
	struct_addr prefsrc;
	uint32_t priority;
	
	/* Los brincos */
	GList *nexthops;
} Route;

struct _NetworkInadorHandle {
	GList *interfaces;
	GList *route_v4_tables;
	GList *route_v6_tables;
	
	NetworkInadorManager *manager;
	
	struct nl_sock * nl_sock_route;
	struct nl_sock * nl_sock_nl80211;
	
	NetlinkEventPair route_events;
	
	NetlinkEventPair nl80211_scan;
	NetlinkEventPair nl80211_scan_results;
};

#endif /* __COMMON_H__ */