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nl80211: Reduce nl80211_dump_scan() memory need

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Instead of fetching all scan results to a temporary buffer, debug print
scan result dump directly from the message handler function one BSS at a
time.

Signed-off-by: Jouni Malinen <j@w1.fi>
This commit is contained in:
Jouni Malinen 2016-12-03 22:14:04 +02:00
parent b72a01bc5a
commit da2c284169
1 changed files with 36 additions and 22 deletions
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58
src/drivers/driver_nl80211_scan.c
View file

@ -626,8 +626,9 @@ static int nl80211_scan_filtered(struct wpa_driver_nl80211_data *drv,
}
static struct wpa_scan_res * nl80211_parse_bss_info(
struct nl_msg *msg, struct nl80211_bss_info_arg *_arg)
static struct wpa_scan_res *
nl80211_parse_bss_info(struct wpa_driver_nl80211_data *drv,
struct nl_msg *msg, struct nl80211_bss_info_arg *_arg)
{
struct nlattr *tb[NL80211_ATTR_MAX + 1];
struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
@ -657,7 +658,7 @@ static struct wpa_scan_res * nl80211_parse_bss_info(
if (nla_parse_nested(bss, NL80211_BSS_MAX, tb[NL80211_ATTR_BSS],
bss_policy))
return NULL;
if (bss[NL80211_BSS_STATUS]) {
if (bss[NL80211_BSS_STATUS] && _arg) {
enum nl80211_bss_status status;
status = nla_get_u32(bss[NL80211_BSS_STATUS]);
if (status == NL80211_BSS_STATUS_ASSOCIATED &&
@ -682,7 +683,7 @@ static struct wpa_scan_res * nl80211_parse_bss_info(
MACSTR, MAC2STR(_arg->assoc_bssid));
}
}
if (!_arg->res)
if (_arg && !_arg->res)
return NULL;
if (bss[NL80211_BSS_INFORMATION_ELEMENTS]) {
ie = nla_data(bss[NL80211_BSS_INFORMATION_ELEMENTS]);
@ -699,7 +700,7 @@ static struct wpa_scan_res * nl80211_parse_bss_info(
beacon_ie_len = 0;
}
if (nl80211_scan_filtered(_arg->drv, ie ? ie : beacon_ie,
if (nl80211_scan_filtered(drv, ie ? ie : beacon_ie,
ie ? ie_len : beacon_ie_len))
return NULL;
@ -767,7 +768,7 @@ int bss_info_handler(struct nl_msg *msg, void *arg)
struct wpa_scan_res **tmp;
struct wpa_scan_res *r;
r = nl80211_parse_bss_info(msg, _arg);
r = nl80211_parse_bss_info(_arg->drv, msg, _arg);
if (!r)
return NL_SKIP;
@ -909,26 +910,39 @@ struct wpa_scan_results * wpa_driver_nl80211_get_scan_results(void *priv)
}
struct nl80211_dump_scan_ctx {
struct wpa_driver_nl80211_data *drv;
int idx;
};
static int nl80211_dump_scan_handler(struct nl_msg *msg, void *arg)
{
struct nl80211_dump_scan_ctx *ctx = arg;
struct wpa_scan_res *r;
r = nl80211_parse_bss_info(ctx->drv, msg, NULL);
if (!r)
return NL_SKIP;
wpa_printf(MSG_DEBUG, "nl80211: %d " MACSTR " %d%s",
ctx->idx, MAC2STR(r->bssid), r->freq,
r->flags & WPA_SCAN_ASSOCIATED ? " [assoc]" : "");
ctx->idx++;
os_free(r);
return NL_SKIP;
}
void nl80211_dump_scan(struct wpa_driver_nl80211_data *drv)
{
struct wpa_scan_results *res;
size_t i;
res = nl80211_get_scan_results(drv);
if (res == NULL) {
wpa_printf(MSG_DEBUG, "nl80211: Failed to get scan results");
return;
}
struct nl_msg *msg;
struct nl80211_dump_scan_ctx ctx;
wpa_printf(MSG_DEBUG, "nl80211: Scan result dump");
for (i = 0; i < res->num; i++) {
struct wpa_scan_res *r = res->res[i];
wpa_printf(MSG_DEBUG, "nl80211: %d/%d " MACSTR "%s",
(int) i, (int) res->num, MAC2STR(r->bssid),
r->flags & WPA_SCAN_ASSOCIATED ? " [assoc]" : "");
}
wpa_scan_results_free(res);
ctx.drv = drv;
ctx.idx = 0;
msg = nl80211_cmd_msg(drv->first_bss, NLM_F_DUMP, NL80211_CMD_GET_SCAN);
if (msg)
send_and_recv_msgs(drv, msg, nl80211_dump_scan_handler, &ctx);
}