module_param_named(roamoff, brcmf_roamoff, int, S_IRUSR);
MODULE_PARM_DESC(roamoff, "Do not use internal roaming engine");
+static int brcmf_iapp_enable;
+module_param_named(iapp, brcmf_iapp_enable, int, 0);
+MODULE_PARM_DESC(iapp, "Enable partial support for the obsoleted Inter-Access Point Protocol");
+
#ifdef DEBUG
/* always succeed brcmf_bus_started() */
static int brcmf_ignore_probe_fail;
settings->feature_disable = brcmf_feature_disable;
settings->fcmode = brcmf_fcmode;
settings->roamoff = !!brcmf_roamoff;
+ settings->iapp = !!brcmf_iapp_enable;
#ifdef DEBUG
settings->ignore_probe_fail = !!brcmf_ignore_probe_fail;
#endif
schedule_work(&ifp->multicast_work);
}
+/**
+ * brcmf_skb_is_iapp - checks if skb is an IAPP packet
+ *
+ * @skb: skb to check
+ */
+static bool brcmf_skb_is_iapp(struct sk_buff *skb)
+{
+ static const u8 iapp_l2_update_packet[6] __aligned(2) = {
+ 0x00, 0x01, 0xaf, 0x81, 0x01, 0x00,
+ };
+ unsigned char *eth_data;
+#if !defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
+ const u16 *a, *b;
+#endif
+
+ if (skb->len - skb->mac_len != 6 ||
+ !is_multicast_ether_addr(eth_hdr(skb)->h_dest))
+ return false;
+
+ eth_data = skb_mac_header(skb) + ETH_HLEN;
+#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
+ return !(((*(const u32 *)eth_data) ^ (*(const u32 *)iapp_l2_update_packet)) |
+ ((*(const u16 *)(eth_data + 4)) ^ (*(const u16 *)(iapp_l2_update_packet + 4))));
+#else
+ a = (const u16 *)eth_data;
+ b = (const u16 *)iapp_l2_update_packet;
+
+ return !((a[0] ^ b[0]) | (a[1] ^ b[1]) | (a[2] ^ b[2]));
+#endif
+}
+
static netdev_tx_t brcmf_netdev_start_xmit(struct sk_buff *skb,
struct net_device *ndev)
{
goto done;
}
+ /* Some recent Broadcom's firmwares disassociate STA when they receive
+ * an 802.11f ADD frame. This behavior can lead to a local DoS security
+ * issue. Attacker may trigger disassociation of any STA by sending a
+ * proper Ethernet frame to the wireless interface.
+ *
+ * Moreover this feature may break AP interfaces in some specific
+ * setups. This applies e.g. to the bridge with hairpin mode enabled and
+ * IFLA_BRPORT_MCAST_TO_UCAST set. IAPP packet generated by a firmware
+ * will get passed back to the wireless interface and cause immediate
+ * disassociation of a just-connected STA.
+ */
+ if (!drvr->settings->iapp && brcmf_skb_is_iapp(skb)) {
+ dev_kfree_skb(skb);
+ ret = -EINVAL;
+ goto done;
+ }
+
/* Make sure there's enough writeable headroom */
if (skb_headroom(skb) < drvr->hdrlen || skb_header_cloned(skb)) {
head_delta = max_t(int, drvr->hdrlen - skb_headroom(skb), 0);
void brcmf_netif_rx(struct brcmf_if *ifp, struct sk_buff *skb)
{
+ /* Most of Broadcom's firmwares send 802.11f ADD frame every time a new
+ * STA connects to the AP interface. This is an obsoleted standard most
+ * users don't use, so don't pass these frames up unless requested.
+ */
+ if (!ifp->drvr->settings->iapp && brcmf_skb_is_iapp(skb)) {
+ brcmu_pkt_buf_free_skb(skb);
+ return;
+ }
+
if (skb->pkt_type == PACKET_MULTICAST)
ifp->ndev->stats.multicast++;