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Wed, 10 Jul 2019 17:37:40 +0000 Received: from DM6PR05MB5273.namprd05.prod.outlook.com ([fe80::d571:4322:69c3:86e7]) by DM6PR05MB5273.namprd05.prod.outlook.com ([fe80::d571:4322:69c3:86e7%7]) with mapi id 15.20.2073.008; Wed, 10 Jul 2019 17:37:40 +0000 Received: from SN6PR05MB4928.namprd05.prod.outlook.com (52.135.117.74) by SN6PR05MB5200.namprd05.prod.outlook.com (20.177.251.77) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.2073.10; Wed, 10 Jul 2019 17:37:04 +0000 Received: from SN6PR05MB4928.namprd05.prod.outlook.com ([fe80::13f:5819:79e7:ea8f]) by SN6PR05MB4928.namprd05.prod.outlook.com ([fe80::13f:5819:79e7:ea8f%5]) with mapi id 15.20.2073.008; Wed, 10 Jul 2019 17:37:04 +0000 From: Sergey Matyukevich To: "linux-wireless@vger.kernel.org" CC: Johannes Berg , Igor Mitsyanko , Mikhail Karpenko , Sergey Matyukevich Subject: [RFC PATCH v3 1/2] cfg80211: refactor cfg80211_bss_update Thread-Topic: [RFC PATCH v3 1/2] cfg80211: refactor cfg80211_bss_update Thread-Index: AQHVN0YUhHXBofQCAUidYlGg48NfoA== Date: Wed, 10 Jul 2019 17:37:01 +0000 Message-ID: <20190710173651.15770-2-sergey.matyukevich.os@quantenna.com> References: <20190710173651.15770-1-sergey.matyukevich.os@quantenna.com> In-Reply-To: <20190710173651.15770-1-sergey.matyukevich.os@quantenna.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-clientproxiedby: BYAPR06CA0028.namprd06.prod.outlook.com (2603:10b6:a03:d4::41) To SN6PR05MB4928.namprd05.prod.outlook.com (2603:10b6:805:9d::10) x-ms-exchange-messagesentrepresentingtype: 1 x-mailer: git-send-email 2.11.0 x-originating-ip: [195.182.157.78] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: a0a4892f-9b5d-4fed-08ba-08d7055d36fc x-microsoft-antispam: BCL:0;PCL:0;RULEID:(2390118)(7020095)(4652040)(8989299)(4534185)(4627221)(201703031133081)(201702281549075)(8990200)(5600148)(711020)(4605104)(1401327)(2017052603328)(7193020);SRVR:SN6PR05MB5200; 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received-spf: None (protection.outlook.com: quantenna.com does not designate permitted sender hosts) x-ms-exchange-senderadcheck: 1 x-microsoft-antispam-message-info: efWtM0zOgaJnzv5YkxMr+pcHJLQcWavkCzGZtab+bo1Kk55Iz0EhSNrDjDydMecl51WZPZvwQhvWJB6bUcYWpi7Jsqss3Ty1AdKKgaj2KyMnPYEvYbgxv1LkfszS5OLjip3xfPGJ3WEFCMdGjXexHUffc3P2uiTnUJUzLxS1KOMIfZbahOJsnHszSF4R9cFXloc4j1lAHDXQxQEFSy/k6E8CYKeA3fY6l0wWshqw0MsCXuVo60XJ3HHAB2e61zx6VELojqBox5ZXPSlEA9ijuk5BkrnT/m2qtM7T0BS4ej/E0eGzsOLCSrL7tjtcvc8AmcjTBBYuZUYLp40TM9n/4yqsqljtd6NgUVrdIh+VWZKjsJay3z79OV1JzepZGOEeHT78xrCMXsvlfq1zLeJBP9VjEbbTYC96zMrmgJgs1+o= Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: quantenna.com X-MS-Exchange-CrossTenant-Network-Message-Id: a0a4892f-9b5d-4fed-08ba-08d7055d36fc X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: a355dbce-62b4-4789-9446-c1d5582180ff X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: SecureScore_8b3391f4-af01-4ee8-b4ea-9871b2499735@quantenna.onmicrosoft.com X-MS-Exchange-CrossTenant-originalarrivaltime: 10 Jul 2019 17:37:40.1650 (UTC) X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM6PR05MB4505 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2019-07-10_06:,, signatures=0 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=974 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1907100198 Sender: linux-wireless-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org This patch implements minor refactoring for cfg80211_bss_update function. Code path for updating known BSS is extracted into dedicated cfg80211_update_known_bss function. Signed-off-by: Sergey Matyukevich --- net/wireless/scan.c | 171 +++++++++++++++++++++++++++---------------------= ---- 1 file changed, 89 insertions(+), 82 deletions(-) diff --git a/net/wireless/scan.c b/net/wireless/scan.c index d66e6d4b7555..9f21162f05e9 100644 --- a/net/wireless/scan.c +++ b/net/wireless/scan.c @@ -1091,6 +1091,93 @@ struct cfg80211_non_tx_bss { u8 bssid_index; }; =20 +static bool +cfg80211_update_known_bss(struct cfg80211_registered_device *rdev, + struct cfg80211_internal_bss *known, + struct cfg80211_internal_bss *new, + bool signal_valid) +{ + lockdep_assert_held(&rdev->bss_lock); + + /* Update IEs */ + if (rcu_access_pointer(new->pub.proberesp_ies)) { + const struct cfg80211_bss_ies *old; + + old =3D rcu_access_pointer(known->pub.proberesp_ies); + + rcu_assign_pointer(known->pub.proberesp_ies, + new->pub.proberesp_ies); + /* Override possible earlier Beacon frame IEs */ + rcu_assign_pointer(known->pub.ies, + new->pub.proberesp_ies); + if (old) + kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head); + } else if (rcu_access_pointer(new->pub.beacon_ies)) { + const struct cfg80211_bss_ies *old; + struct cfg80211_internal_bss *bss; + + if (known->pub.hidden_beacon_bss && + !list_empty(&known->hidden_list)) { + const struct cfg80211_bss_ies *f; + + /* The known BSS struct is one of the probe + * response members of a group, but we're + * receiving a beacon (beacon_ies in the new + * bss is used). This can only mean that the + * AP changed its beacon from not having an + * SSID to showing it, which is confusing so + * drop this information. + */ + + f =3D rcu_access_pointer(new->pub.beacon_ies); + kfree_rcu((struct cfg80211_bss_ies *)f, rcu_head); + return false; + } + + old =3D rcu_access_pointer(known->pub.beacon_ies); + + rcu_assign_pointer(known->pub.beacon_ies, new->pub.beacon_ies); + + /* Override IEs if they were from a beacon before */ + if (old =3D=3D rcu_access_pointer(known->pub.ies)) + rcu_assign_pointer(known->pub.ies, new->pub.beacon_ies); + + /* Assign beacon IEs to all sub entries */ + list_for_each_entry(bss, &known->hidden_list, hidden_list) { + const struct cfg80211_bss_ies *ies; + + ies =3D rcu_access_pointer(bss->pub.beacon_ies); + WARN_ON(ies !=3D old); + + rcu_assign_pointer(bss->pub.beacon_ies, + new->pub.beacon_ies); + } + + if (old) + kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head); + } + + known->pub.beacon_interval =3D new->pub.beacon_interval; + + /* don't update the signal if beacon was heard on + * adjacent channel. + */ + if (signal_valid) + known->pub.signal =3D new->pub.signal; + known->pub.capability =3D new->pub.capability; + known->ts =3D new->ts; + known->ts_boottime =3D new->ts_boottime; + known->parent_tsf =3D new->parent_tsf; + known->pub.chains =3D new->pub.chains; + memcpy(known->pub.chain_signal, new->pub.chain_signal, + IEEE80211_MAX_CHAINS); + ether_addr_copy(known->parent_bssid, new->parent_bssid); + known->pub.max_bssid_indicator =3D new->pub.max_bssid_indicator; + known->pub.bssid_index =3D new->pub.bssid_index; + + return true; +} + /* Returned bss is reference counted and must be cleaned up appropriately.= */ struct cfg80211_internal_bss * cfg80211_bss_update(struct cfg80211_registered_device *rdev, @@ -1114,88 +1201,8 @@ cfg80211_bss_update(struct cfg80211_registered_devic= e *rdev, found =3D rb_find_bss(rdev, tmp, BSS_CMP_REGULAR); =20 if (found) { - /* Update IEs */ - if (rcu_access_pointer(tmp->pub.proberesp_ies)) { - const struct cfg80211_bss_ies *old; - - old =3D rcu_access_pointer(found->pub.proberesp_ies); - - rcu_assign_pointer(found->pub.proberesp_ies, - tmp->pub.proberesp_ies); - /* Override possible earlier Beacon frame IEs */ - rcu_assign_pointer(found->pub.ies, - tmp->pub.proberesp_ies); - if (old) - kfree_rcu((struct cfg80211_bss_ies *)old, - rcu_head); - } else if (rcu_access_pointer(tmp->pub.beacon_ies)) { - const struct cfg80211_bss_ies *old; - struct cfg80211_internal_bss *bss; - - if (found->pub.hidden_beacon_bss && - !list_empty(&found->hidden_list)) { - const struct cfg80211_bss_ies *f; - - /* - * The found BSS struct is one of the probe - * response members of a group, but we're - * receiving a beacon (beacon_ies in the tmp - * bss is used). This can only mean that the - * AP changed its beacon from not having an - * SSID to showing it, which is confusing so - * drop this information. - */ - - f =3D rcu_access_pointer(tmp->pub.beacon_ies); - kfree_rcu((struct cfg80211_bss_ies *)f, - rcu_head); - goto drop; - } - - old =3D rcu_access_pointer(found->pub.beacon_ies); - - rcu_assign_pointer(found->pub.beacon_ies, - tmp->pub.beacon_ies); - - /* Override IEs if they were from a beacon before */ - if (old =3D=3D rcu_access_pointer(found->pub.ies)) - rcu_assign_pointer(found->pub.ies, - tmp->pub.beacon_ies); - - /* Assign beacon IEs to all sub entries */ - list_for_each_entry(bss, &found->hidden_list, - hidden_list) { - const struct cfg80211_bss_ies *ies; - - ies =3D rcu_access_pointer(bss->pub.beacon_ies); - WARN_ON(ies !=3D old); - - rcu_assign_pointer(bss->pub.beacon_ies, - tmp->pub.beacon_ies); - } - - if (old) - kfree_rcu((struct cfg80211_bss_ies *)old, - rcu_head); - } - - found->pub.beacon_interval =3D tmp->pub.beacon_interval; - /* - * don't update the signal if beacon was heard on - * adjacent channel. - */ - if (signal_valid) - found->pub.signal =3D tmp->pub.signal; - found->pub.capability =3D tmp->pub.capability; - found->ts =3D tmp->ts; - found->ts_boottime =3D tmp->ts_boottime; - found->parent_tsf =3D tmp->parent_tsf; - found->pub.chains =3D tmp->pub.chains; - memcpy(found->pub.chain_signal, tmp->pub.chain_signal, - IEEE80211_MAX_CHAINS); - ether_addr_copy(found->parent_bssid, tmp->parent_bssid); - found->pub.max_bssid_indicator =3D tmp->pub.max_bssid_indicator; - found->pub.bssid_index =3D tmp->pub.bssid_index; + if (!cfg80211_update_known_bss(rdev, found, tmp, signal_valid)) + goto drop; } else { struct cfg80211_internal_bss *new; struct cfg80211_internal_bss *hidden; --=20 2.11.0