Merge pull request #18 from danielinux/tcp-congestion-control-fixes

TCP congestion control fixes

Author: gasbytes

README.md

@@ -30,7 +30,7 @@ A single network interface can be associated with the device.
 | **Transport** | UDP | Unicast datagrams, checksum | [RFC 768](https://datatracker.ietf.org/doc/html/rfc768) |
 | **Transport** | TCP | Connection management, reliable delivery | [RFC 793](https://datatracker.ietf.org/doc/html/rfc793), [RFC 9293](https://datatracker.ietf.org/doc/html/rfc9293) |
 | **Transport** | TCP Options: MSS | Maximum Segment Size negotiation | [RFC 793](https://datatracker.ietf.org/doc/html/rfc793) |
-| **Transport** | TCP Options: Timestamps | RTT measurement, PAWS | [RFC 7323](https://datatracker.ietf.org/doc/html/rfc7323) |
+| **Transport** | TCP Options: Timestamps | RTT measurement, PAWS, Window Scaling | [RFC 7323](https://datatracker.ietf.org/doc/html/rfc7323) |
 | **Transport** | TCP Congestion Control | Slow start, congestion avoidance | [RFC 5681](https://datatracker.ietf.org/doc/html/rfc5681) |
 | **Transport** | TCP Fast Retransmit | Triple duplicate ACK detection | [RFC 5681](https://datatracker.ietf.org/doc/html/rfc5681) |
 | **Application** | DHCP | Client only (DORA) | [RFC 2131](https://datatracker.ietf.org/doc/html/rfc2131) |

src/port/posix/bsd_socket.c

@@ -1431,7 +1431,7 @@ void __attribute__((constructor)) init_wolfip_posix() {
     wolfIP_ipconfig_set(IPSTACK, atoip4(WOLFIP_IP), atoip4("255.255.255.0"),
             atoip4(HOST_STACK_IP));
     printf("IP: manually configured - %s\n", WOLFIP_IP);
-    sleep(1);
+    sleep(2);
     pthread_create(&wolfIP_thread, NULL, wolfIP_sock_posix_ip_loop, IPSTACK);
     in_the_stack = 0;
 }

src/port/posix/tap_linux.c

@@ -101,9 +101,14 @@ int tap_init(struct wolfIP_ll_dev *ll, const char *ifname, uint32_t host_ip)
                 tap_fd = -1;
             }
         }
-        if (tap_fd < 0) {
-            return -1;
-        }
+    if (tap_fd < 0) {
+        return -1;
+    }
+    {
+        int flags = fcntl(tap_fd, F_GETFL, 0);
+        if (flags >= 0)
+            (void)fcntl(tap_fd, F_SETFL, flags | O_NONBLOCK);
+    }
     }
     /* Get mac address */
     if (ioctl(tap_fd, SIOCGIFHWADDR, &ifr) < 0) {