mausezahn: Support -R to set packet priority

Add a command line option -R to specify SO_PRIORITY socket option. This
then sets priority of the generated SKBs, which is handy for testing Qdiscs
and other priority-dependent functionality.

Signed-off-by: Petr Machata <petrm@mellanox.com>
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>

1 files changed, 9 insertions, 0 deletions

diff --git a/staging/layer3.c b/staging/layer3.c
index 0b17db1..7dabc26 100644
--- a/staging/layer3.c
+++ b/staging/layer3.c
@@ -133,6 +133,15 @@ libnet_t* get_link_context(void)
 	fprintf(stderr, "%s", errbuf);
 	exit(EXIT_FAILURE);
      }
+
+   if (tx.prio != 0 &&
+       setsockopt (libnet_getfd (l), SOL_SOCKET, SO_PRIORITY, &tx.prio,
+		   sizeof tx.prio) < 0)
+     {
+       perror("setsockopt SO_PRIORITY");
+       exit(EXIT_FAILURE);
+     }
+
    return l;
 }