mirror of
git://projects.qi-hardware.com/openwrt-xburst.git
synced 2024-09-12 17:12:25 +03:00
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@14225 3c298f89-4303-0410-b956-a3cf2f4a3e73
185 lines
5.1 KiB
Diff
185 lines
5.1 KiB
Diff
--- a/hostapd/driver_nl80211.c
|
|
+++ b/hostapd/driver_nl80211.c
|
|
@@ -27,6 +27,7 @@
|
|
#include <net/if.h>
|
|
#include <netpacket/packet.h>
|
|
#include "wireless_copy.h"
|
|
+#include <linux/filter.h>
|
|
#include <net/if_arp.h>
|
|
|
|
#include "hostapd.h"
|
|
@@ -1728,6 +1729,9 @@ static void handle_frame(struct hostapd_
|
|
case WLAN_FC_TODS:
|
|
bssid = hdr->addr1;
|
|
break;
|
|
+ case WLAN_FC_FROMDS:
|
|
+ bssid = hdr->addr2;
|
|
+ break;
|
|
default:
|
|
/* discard */
|
|
return;
|
|
@@ -1908,6 +1912,150 @@ static void handle_monitor_read(int sock
|
|
}
|
|
|
|
|
|
+/*
|
|
+ * we post-process the filter code later and rewrite
|
|
+ * this to the offset to the last instruction
|
|
+ */
|
|
+#define PASS 0xFF
|
|
+#define FAIL 0xFE
|
|
+
|
|
+static struct sock_filter msock_filter_insns[] = {
|
|
+ /*
|
|
+ * do a little-endian load of the radiotap length field
|
|
+ */
|
|
+ /* load lower byte into A */
|
|
+ BPF_STMT(BPF_LD | BPF_B | BPF_ABS, 2),
|
|
+ /* put it into X (== index register) */
|
|
+ BPF_STMT(BPF_MISC| BPF_TAX, 0),
|
|
+ /* load upper byte into A */
|
|
+ BPF_STMT(BPF_LD | BPF_B | BPF_ABS, 3),
|
|
+ /* left-shift it by 8 */
|
|
+ BPF_STMT(BPF_ALU | BPF_LSH | BPF_K, 8),
|
|
+ /* or with X */
|
|
+ BPF_STMT(BPF_ALU | BPF_OR | BPF_X, 0),
|
|
+ /* put result into X */
|
|
+ BPF_STMT(BPF_MISC| BPF_TAX, 0),
|
|
+
|
|
+ /*
|
|
+ * Allow management frames through, this also gives us those
|
|
+ * management frames that we sent ourselves with status
|
|
+ */
|
|
+ /* load the lower byte of the IEEE 802.11 frame control field */
|
|
+ BPF_STMT(BPF_LD | BPF_B | BPF_IND, 0),
|
|
+ /* mask off frame type and version */
|
|
+ BPF_STMT(BPF_ALU | BPF_AND | BPF_K, 0xF),
|
|
+ /* accept frame if it's both 0, fall through otherwise */
|
|
+ BPF_JUMP(BPF_JMP | BPF_JEQ | BPF_K, 0, PASS, 0),
|
|
+
|
|
+ /*
|
|
+ * TODO: add a bit to radiotap RX flags that indicates
|
|
+ * that the sending station is not associated, then
|
|
+ * add a filter here that filters on our DA and that flag
|
|
+ * to allow us to deauth frames to that bad station.
|
|
+ *
|
|
+ * Not a regression -- we didn't do it before either.
|
|
+ */
|
|
+
|
|
+#if 0
|
|
+ /*
|
|
+ * drop non-data frames, WDS frames
|
|
+ */
|
|
+ /* load the lower byte of the frame control field */
|
|
+ BPF_STMT(BPF_LD | BPF_B | BPF_IND, 0),
|
|
+ /* mask off QoS bit */
|
|
+ BPF_STMT(BPF_ALU | BPF_AND | BPF_K, 0x0c),
|
|
+ /* drop non-data frames */
|
|
+ BPF_JUMP(BPF_JMP | BPF_JEQ | BPF_K, 8, 0, FAIL),
|
|
+ /* load the upper byte of the frame control field */
|
|
+ BPF_STMT(BPF_LD | BPF_B | BPF_IND, 0),
|
|
+ /* mask off toDS/fromDS */
|
|
+ BPF_STMT(BPF_ALU | BPF_AND | BPF_K, 0x03),
|
|
+ /* drop WDS frames */
|
|
+ BPF_JUMP(BPF_JMP | BPF_JEQ | BPF_K, 3, FAIL, 0),
|
|
+#endif
|
|
+
|
|
+ /*
|
|
+ * add header length to index
|
|
+ */
|
|
+ /* load the lower byte of the frame control field */
|
|
+ BPF_STMT(BPF_LD | BPF_B | BPF_IND, 0),
|
|
+ /* mask off QoS bit */
|
|
+ BPF_STMT(BPF_ALU | BPF_AND | BPF_K, 0x80),
|
|
+ /* right shift it by 6 to give 0 or 2 */
|
|
+ BPF_STMT(BPF_ALU | BPF_RSH | BPF_K, 6),
|
|
+ /* add data frame header length */
|
|
+ BPF_STMT(BPF_ALU | BPF_ADD | BPF_K, 24),
|
|
+ /* add index, was start of 802.11 header */
|
|
+ BPF_STMT(BPF_ALU | BPF_ADD | BPF_X, 0),
|
|
+ /* move to index, now start of LL header */
|
|
+ BPF_STMT(BPF_MISC | BPF_TAX, 0),
|
|
+
|
|
+ /*
|
|
+ * Accept empty data frames, we use those for
|
|
+ * polling activity.
|
|
+ */
|
|
+ BPF_STMT(BPF_LD | BPF_W | BPF_LEN, 0),
|
|
+ BPF_JUMP(BPF_JMP | BPF_JEQ | BPF_X, 0, PASS, 0),
|
|
+
|
|
+ /*
|
|
+ * Accept EAPOL frames
|
|
+ */
|
|
+ BPF_STMT(BPF_LD | BPF_W | BPF_IND, 0),
|
|
+ BPF_JUMP(BPF_JMP | BPF_JEQ | BPF_K, 0xAAAA0300, 0, FAIL),
|
|
+ BPF_STMT(BPF_LD | BPF_W | BPF_IND, 4),
|
|
+ BPF_JUMP(BPF_JMP | BPF_JEQ | BPF_K, 0x0000888E, PASS, FAIL),
|
|
+
|
|
+ /* keep these last two statements or change the code below */
|
|
+ /* return 0 == "DROP" */
|
|
+ BPF_STMT(BPF_RET | BPF_K, 0),
|
|
+ /* return ~0 == "keep all" */
|
|
+ BPF_STMT(BPF_RET | BPF_K, ~0),
|
|
+};
|
|
+
|
|
+static struct sock_fprog msock_filter = {
|
|
+ .len = sizeof(msock_filter_insns)/sizeof(msock_filter_insns[0]),
|
|
+ .filter = msock_filter_insns,
|
|
+};
|
|
+
|
|
+
|
|
+static int add_monitor_filter(int s)
|
|
+{
|
|
+ int idx;
|
|
+
|
|
+ /* rewrite all PASS/FAIL jump offsets */
|
|
+ for (idx = 0; idx < msock_filter.len; idx++) {
|
|
+ struct sock_filter *insn = &msock_filter_insns[idx];
|
|
+
|
|
+ if (BPF_CLASS(insn->code) == BPF_JMP) {
|
|
+ if (insn->code == (BPF_JMP|BPF_JA)) {
|
|
+ if (insn->k == PASS)
|
|
+ insn->k = msock_filter.len - idx - 2;
|
|
+ else if (insn->k == FAIL)
|
|
+ insn->k = msock_filter.len - idx - 3;
|
|
+ }
|
|
+
|
|
+ if (insn->jt == PASS)
|
|
+ insn->jt = msock_filter.len - idx - 2;
|
|
+ else if (insn->jt == FAIL)
|
|
+ insn->jt = msock_filter.len - idx - 3;
|
|
+
|
|
+ if (insn->jf == PASS)
|
|
+ insn->jf = msock_filter.len - idx - 2;
|
|
+ else if (insn->jf == FAIL)
|
|
+ insn->jf = msock_filter.len - idx - 3;
|
|
+ }
|
|
+ }
|
|
+
|
|
+ if (setsockopt(s, SOL_SOCKET, SO_ATTACH_FILTER,
|
|
+ &msock_filter, sizeof(msock_filter))) {
|
|
+ perror("SO_ATTACH_FILTER");
|
|
+ return -1;
|
|
+ }
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+
|
|
static int nl80211_create_monitor_interface(struct i802_driver_data *drv)
|
|
{
|
|
char buf[IFNAMSIZ];
|
|
@@ -1936,6 +2084,12 @@ static int nl80211_create_monitor_interf
|
|
goto error;
|
|
}
|
|
|
|
+ if (add_monitor_filter(drv->monitor_sock)) {
|
|
+ wpa_printf(MSG_INFO, "Failed to set socket filter for monitor "
|
|
+ "interface; do filtering in user space");
|
|
+ /* This works, but will cost in performance. */
|
|
+ }
|
|
+
|
|
if (bind(drv->monitor_sock, (struct sockaddr *) &ll,
|
|
sizeof(ll)) < 0) {
|
|
perror("monitor socket bind");
|