#Hostapd之main函数(2)

main函数->hostapd_interface_init

4. 注册timeout，clean up的间隔(不重要)

eloop_register_timeout(HOSTAPD_CLEANUP_INTERVAL, 0,
hostapd_periodic, &interfaces, NULL);

hostapd_periodic->hostapd_for_each_interface->hostapd_periodic_call ->hostapd_periodic_iface

void hostapd_periodic_iface(struct hostapd_iface *iface)
{
size_t i;

ap_list_timer(iface);

for (i = 0; i < iface->num_bss; i++) {
struct hostapd_data *hapd = iface->bss[i];

if (!hapd->started)
continue;

#ifndef CONFIG_NO_RADIUS
hostapd_acl_expire(hapd);
#endif /* CONFIG_NO_RADIUS */
}
}

5. 有限状态机的初始化（什么时候为真？）

if (fst_global_init()) {
wpa_printf(MSG_ERROR,
"Failed to initialize global FST context");
goto out;
}

#if defined(CONFIG_FST) && defined(CONFIG_CTRL_IFACE)
if (!fst_global_add_ctrl(fst_ctrl_cli))
wpa_printf(MSG_WARNING, "Failed to add CLI FST ctrl");
#endif /* CONFIG_FST && CONFIG_CTRL_IFACE */

6. interface 初始化过程

对each iface执行初始化

for (i = 0; i < interfaces.count; i++) {
interfaces.iface[i] = hostapd_interface_init(&interfaces,
argv[optind + i],
debug);
if (!interfaces.iface[i]) {
wpa_printf(MSG_ERROR, "Failed to initialize interface");
goto out;
}
}

hostapd_interface_init执行初始化操作，

static struct hostapd_iface *
hostapd_interface_init(struct hapd_interfaces *interfaces,
const char *config_fname, int debug)
{
struct hostapd_iface *iface;//[1]
int k;

wpa_printf(MSG_ERROR, "Configuration file: %s", config_fname);
iface = hostapd_init(interfaces, config_fname);//[2]
if (!iface)
return NULL;
iface->interfaces = interfaces;

for (k = 0; k < debug; k++) {
if (iface->bss[0]->conf->logger_stdout_level > 0)
iface->bss[0]->conf->logger_stdout_level--;
}

if (iface->conf->bss[0]->iface[0] == '\0' &&
!hostapd_drv_none(iface->bss[0])) {
wpa_printf(MSG_ERROR, "Interface name not specified in %s",
config_fname);
hostapd_interface_deinit_free(iface);//[3]
return NULL;
}

return iface;
}

[1]

struct hostapd_iface (src/ap/hostapd.h)。在这个数据结构中，主要有以下字段：

/**
* struct hostapd_iface - hostapd per-interface data structure
*/
struct hostapd_iface {
struct hapd_interfaces *interfaces;
void *owner;
char *config_fname;
struct hostapd_config *conf;
char phy[16]; /* Name of the PHY (radio) */

enum hostapd_iface_state {
HAPD_IFACE_UNINITIALIZED,
HAPD_IFACE_DISABLED,
HAPD_IFACE_COUNTRY_UPDATE,
HAPD_IFACE_ACS,
HAPD_IFACE_HT_SCAN,
HAPD_IFACE_DFS,
HAPD_IFACE_ENABLED
} state;

1) struct hostapd_config： 保存对网络接口的配置（从配置文件hostapd.conf中加载）

/**
* struct hostapd_config - Per-radio interface configuration
*/
struct hostapd_config {
struct hostapd_bss_config **bss, *last_bss;
size_t num_bss;

u16 beacon_int;
int rts_threshold;
int fragm_threshold;
u8 send_probe_response;
u8 channel;
u8 acs;
struct wpa_freq_range_list acs_ch_list;
enum hostapd_hw_mode hw_mode; /* HOSTAPD_MODE_IEEE80211A, .. */
enum {
LONG_PREAMBLE = 0,
SHORT_PREAMBLE = 1
} preamble;

int *supported_rates;
int *basic_rates;

const struct wpa_driver_ops *driver;
char *driver_params;

int ap_table_max_size;
int ap_table_expiration_time;

unsigned int track_sta_max_num;
unsigned int track_sta_max_age;

char country[3]; /* first two octets: country code as described in
* ISO/IEC 3166-1. Third octet:
* ' ' (ascii 32): all environments
* 'O': Outdoor environemnt only
* 'I': Indoor environment only
*/

int ieee80211d;

int ieee80211h; /* DFS */

/*
* Local power constraint is an octet encoded as an unsigned integer in
* units of decibels. Invalid value -1 indicates that Power Constraint
* element will not be added.
*/
int local_pwr_constraint;

/* Control Spectrum Management bit */
int spectrum_mgmt_required;

struct hostapd_tx_queue_params tx_queue[NUM_TX_QUEUES];

/*
* WMM AC parameters, in same order as 802.1D, i.e.
* 0 = BE (best effort)
* 1 = BK (background)
* 2 = VI (video)
* 3 = VO (voice)
*/
struct hostapd_wmm_ac_params wmm_ac_params[4];

int ht_op_mode_fixed;
u16 ht_capab;
int ieee80211n;
int secondary_channel;
int no_pri_sec_switch;
int require_ht;
int obss_interval;
u32 vht_capab;
int ieee80211ac;
int require_vht;
u8 vht_oper_chwidth;
u8 vht_oper_centr_freq_seg0_idx;
u8 vht_oper_centr_freq_seg1_idx;

#ifdef CONFIG_FST
struct fst_iface_cfg fst_cfg;
#endif /* CONFIG_FST */

#ifdef CONFIG_P2P
u8 p2p_go_ctwindow;
#endif /* CONFIG_P2P */

#ifdef CONFIG_TESTING_OPTIONS
double ignore_probe_probability;
double ignore_auth_probability;
double ignore_assoc_probability;
double ignore_reassoc_probability;
double corrupt_gtk_rekey_mic_probability;
#endif /* CONFIG_TESTING_OPTIONS */

#ifdef CONFIG_ACS
unsigned int acs_num_scans;
struct acs_bias {
int channel;
double bias;
} *acs_chan_bias;
unsigned int num_acs_chan_bias;
#endif /* CONFIG_ACS */
};

sizt_t num_bss： 此接口下辖的BSS 个数

struct hostapd_data **bss：BSS 列表，描述各BSS 的配置