add option sock_qdisc_bypass

OpenHD · Mar 20, 2024 · 56446ed · 56446ed
1 parent 5e0aa45
commit 56446ed
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Showing 3 changed files with 26 additions and 0 deletions.
diff --git a/wifibroadcast/src/WBTxRx.cpp b/wifibroadcast/src/WBTxRx.cpp
@@ -66,8 +66,16 @@ WBTxRx::WBTxRx(
       // TX part - using raw socket or pcap
       if (m_options.tx_without_pcap) {
         pcapTxRx.tx_sockfd = open_wifi_interface_as_raw_socket(wifi_card.name);
+        if (m_options.set_tx_sock_qdisc_bypass) {
+          wifibroadcast::pcap_helper::set_tx_sock_qdisc_bypass(
+              pcapTxRx.tx_sockfd);
+        }
       } else {
         pcapTxRx.tx = wifibroadcast::pcap_helper::open_pcap_tx(wifi_card.name);
+        if (m_options.set_tx_sock_qdisc_bypass) {
+          wifibroadcast::pcap_helper::pcap_set_tx_sock_qdisc_bypass(
+              pcapTxRx.tx);
+        }
       }
       m_pcap_handles.push_back(pcapTxRx);
     }

diff --git a/wifibroadcast/src/WBTxRx.h b/wifibroadcast/src/WBTxRx.h
@@ -67,6 +67,7 @@ class WBTxRx {
     // on the rx pcap rx fd, set direction PCAP_D_IN (aka only packets received
     // by the card) - doesn't work on AR9271
     bool pcap_rx_set_direction = true;
+    bool set_tx_sock_qdisc_bypass = false;
     // thy spam the console, but usefully for debugging
     // log all received packets (regardless where they are from)
     bool log_all_received_packets = false;

diff --git a/wifibroadcast/src/pcap_helper.hpp b/wifibroadcast/src/pcap_helper.hpp
@@ -5,6 +5,7 @@
 #ifndef WIFIBROADCAST_SRC_PCAP_HELPER_H_
 #define WIFIBROADCAST_SRC_PCAP_HELPER_H_
 
+#include <netpacket/packet.h>
 #include <pcap/pcap.h>
 
 #include <string>
@@ -113,6 +114,22 @@ static pcap_t *open_pcap_tx(const std::string &wlan) {
   return p;
 }
 
+static void set_tx_sock_qdisc_bypass(int fd) {
+  /* setting PACKET_QDISC_BYPASS to 1 ?? */
+  int32_t sock_qdisc_bypass = 1;
+  const auto ret = setsockopt(fd, SOL_PACKET, PACKET_QDISC_BYPASS,
+                              &sock_qdisc_bypass, sizeof(sock_qdisc_bypass));
+  if (ret != 0) {
+    wifibroadcast::log::get_default()->warn("Cannot set PACKET_QDISC_BYPASS");
+  } else {
+    wifibroadcast::log::get_default()->debug("PACKET_QDISC_BYPASS set");
+  }
+}
+static void pcap_set_tx_sock_qdisc_bypass(pcap_t *handle) {
+  auto fd = pcap_get_selectable_fd(handle);
+  set_tx_sock_qdisc_bypass(fd);
+}
+
 }  // namespace wifibroadcast::pcap_helper
 
 #endif  // WIFIBROADCAST_SRC_PCAP_HELPER_H_