New mode: -7 - As -6 but with wrong chksum

Author: ValdikSS

README.md

@@ -80,6 +80,7 @@ LEGACY modesets:
 Modern modesets (more stable, more compatible, faster):
  -5          -f 2 -e 2 --auto-ttl --reverse-frag --max-payload (this is the default)
  -6          -f 2 -e 2 --wrong-seq --reverse-frag --max-payload
+ -7          -f 2 -e 2 --wrong-chksum --reverse-frag --max-payload
 ```
 
 To check if your ISP's DPI could be circumvented, first make sure that your provider does not poison DNS answers by enabling "Secure DNS (DNS over HTTPS)" option in your browser.

src/goodbyedpi.c

@@ -648,7 +648,7 @@ int main(int argc, char *argv[]) {
         max_payload_size = 1200;
     }
 
-    while ((opt = getopt_long(argc, argv, "123456pqrsaf:e:mwk:n", long_options, NULL)) != -1) {
+    while ((opt = getopt_long(argc, argv, "1234567pqrsaf:e:mwk:n", long_options, NULL)) != -1) {
         switch (opt) {
             case '1':
                 do_passivedpi = do_host = do_host_removespace \
@@ -689,6 +689,15 @@ int main(int argc, char *argv[]) {
                 do_wrong_seq = 1;
                 max_payload_size = 1200;
                 break;
+            case '7':
+                do_fragment_http = do_fragment_https = 1;
+                do_reverse_frag = do_native_frag = 1;
+                http_fragment_size = https_fragment_size = 2;
+                do_fragment_http_persistent = do_fragment_http_persistent_nowait = 1;
+                do_fake_packet = 1;
+                do_wrong_chksum = 1;
+                max_payload_size = 1200;
+                break;
             case 'p':
                 do_passivedpi = 1;
                 break;
@@ -950,7 +959,9 @@ int main(int argc, char *argv[]) {
                 "\n"
                 "Modern modesets (more stable, more compatible, faster):\n"
                 " -5          -f 2 -e 2 --auto-ttl --reverse-frag --max-payload (this is the default)\n"
-                " -6          -f 2 -e 2 --wrong-seq --reverse-frag --max-payload\n");
+                " -6          -f 2 -e 2 --wrong-seq --reverse-frag --max-payload\n"
+                " -7          -f 2 -e 2 --wrong-chksum --reverse-frag --max-payload\n"
+                );
                 exit(EXIT_FAILURE);
         }
     }