rxrpc: Add config to inject packet loss

Add a configuration option to inject packet loss by discarding
approximately every 8th packet received and approximately every 8th DATA
packet transmitted.

Note that no locking is used, but it shouldn't really matter.

Signed-off-by: David Howells <dhowells@redhat.com>

diff --git a/net/rxrpc/Kconfig b/net/rxrpc/Kconfig
index 13396c7..86f8853 100644 (file)
--- a/net/rxrpc/Kconfig
+++ b/net/rxrpc/Kconfig
@@ -26,6 +26,13 @@ config AF_RXRPC_IPV6
          Say Y here to allow AF_RXRPC to use IPV6 UDP as well as IPV4 UDP as
          its network transport.
 
+config AF_RXRPC_INJECT_LOSS
+       bool "Inject packet loss into RxRPC packet stream"
+       depends on AF_RXRPC
+       help
+         Say Y here to inject packet loss by discarding some received and some
+         transmitted packets.
+
 
 config AF_RXRPC_DEBUG
        bool "RxRPC dynamic debugging"

diff --git a/net/rxrpc/input.c b/net/rxrpc/input.c
index 84bb16d..7ac1edf 100644 (file)
--- a/net/rxrpc/input.c
+++ b/net/rxrpc/input.c
@@ -712,6 +712,14 @@ void rxrpc_data_ready(struct sock *udp_sk)
        skb_orphan(skb);
        sp = rxrpc_skb(skb);
 
+       if (IS_ENABLED(CONFIG_AF_RXRPC_INJECT_LOSS)) {
+               static int lose;
+               if ((lose++ & 7) == 7) {
+                       rxrpc_lose_skb(skb, rxrpc_skb_rx_lost);
+                       return;
+               }
+       }
+
        _net("Rx UDP packet from %08x:%04hu",
             ntohl(ip_hdr(skb)->saddr), ntohs(udp_hdr(skb)->source));
 

diff --git a/net/rxrpc/output.c b/net/rxrpc/output.c
index a2cad5c..16e18a9 100644 (file)
--- a/net/rxrpc/output.c
+++ b/net/rxrpc/output.c
@@ -225,6 +225,15 @@ int rxrpc_send_data_packet(struct rxrpc_connection *conn, struct sk_buff *skb)
        msg.msg_controllen = 0;
        msg.msg_flags = 0;
 
+       if (IS_ENABLED(CONFIG_AF_RXRPC_INJECT_LOSS)) {
+               static int lose;
+               if ((lose++ & 7) == 7) {
+                       rxrpc_lose_skb(skb, rxrpc_skb_tx_lost);
+                       _leave(" = 0 [lose]");
+                       return 0;
+               }
+       }
+
        /* send the packet with the don't fragment bit set if we currently
         * think it's small enough */
        if (skb->len - sizeof(struct rxrpc_wire_header) < conn->params.peer->maxdata) {