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wiphy: Don't store rsne unless needed 

Open networks do not contain a RSN element, so storing a 256 byte buffer
was too expensive.

This patch also has the side-effect of fixing detection of Open
Networks.  Prior to this, if the scan results did not contain an RSN IE,
the 'rsne' variable would be set to all zeros.  scan_get_ssid_security
would then be called, but instead of a NULL struct ie_rsn_info, a
non-null, but zerod out ie_rsn_info would be passed in.  This caused the
code to work, but for the wrong reasons.
This commit is contained in:
Denis Kenzior 2015-02-25 21:13:24 -06:00
parent 458ad2af77
commit e69b21ccdf
1 changed files with 23 additions and 10 deletions
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33
src/wiphy.c
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@ -58,7 +58,7 @@ struct bss {
uint32_t frequency;
int32_t signal_strength;
uint16_t capability;
uint8_t rsne[256];
uint8_t *rsne;
};
struct netdev {
@ -299,6 +299,7 @@ static void bss_free(void *data)
l_debug("Freeing BSS %02X:%02X:%02X:%02X:%02X:%02X",
bss->addr[0], bss->addr[1], bss->addr[2],
bss->addr[3], bss->addr[4], bss->addr[5]);
l_free(bss->rsne);
l_free(bss);
}
@ -820,7 +821,9 @@ static bool parse_ie(struct bss *bss, const uint8_t **ssid, int *ssid_len,
*ssid = iter.data;
break;
case IE_TYPE_RSN:
memcpy(bss->rsne, iter.data - 2, iter.len + 2);
if (!bss->rsne)
bss->rsne = l_memdup(iter.data - 2,
iter.len + 2);
break;
default:
break;
@ -849,10 +852,8 @@ static void parse_bss(struct netdev *netdev, struct l_genl_attr *attr)
const uint8_t *ssid = NULL;
int ssid_len;
struct network *network = NULL;
struct ie_rsn_info rsne;
enum scan_ssid_security ssid_security;
const char *id;
int res;
bss = l_new(struct bss, 1);
@ -906,16 +907,28 @@ static void parse_bss(struct netdev *netdev, struct l_genl_attr *attr)
}
/*
* TODO: Check whether WPA element is present
*
* If we have the RSN element, try to parse it and figure out the
* security parameters.
*
* Length was already validated by parse_ie, so use the one from the
* IE directly.
*/
res = ie_parse_rsne_from_data(bss->rsne, bss->rsne[1] + 2, &rsne);
if (res < 0) {
l_debug("Cannot parse RSN field (%d, %s)", res, strerror(-res));
goto fail;
}
if (bss->rsne) {
struct ie_rsn_info rsne;
int res = ie_parse_rsne_from_data(bss->rsne, bss->rsne[1] + 2,
&rsne);
if (res < 0) {
l_debug("Cannot parse RSN field (%d, %s)",
res, strerror(-res));
goto fail;
}
ssid_security = scan_get_ssid_security(bss->capability, &rsne);
} else
ssid_security = scan_get_ssid_security(bss->capability, NULL);
ssid_security = scan_get_ssid_security(bss->capability, &rsne);
id = iwd_network_get_id(ssid, ssid_len, ssid_security);
network = l_hashmap_lookup(netdev->networks, id);