From 8cfab9d014075a649b8f559d3f5f20ee94b1decf Mon Sep 17 00:00:00 2001
From: Christian Mehlis <mehlis@inf.fu-berlin.de>
Date: Tue, 14 Jan 2014 07:29:28 +0100
Subject: [PATCH] ipv6_sendto: return the success

---
 sys/net/include/sixlowpan/ip.h           | 8 +++++++-
 sys/net/network_layer/sixlowpan/ip.c     | 6 ++++--
 sys/net/transport_layer/destiny/socket.c | 9 +++------
 3 files changed, 14 insertions(+), 9 deletions(-)

diff --git a/sys/net/include/sixlowpan/ip.h b/sys/net/include/sixlowpan/ip.h
index 56ac1c180f..6f231a0c93 100644
--- a/sys/net/include/sixlowpan/ip.h
+++ b/sys/net/include/sixlowpan/ip.h
@@ -84,8 +84,14 @@ ipv6_hdr_t *ipv6_get_buf(void);
  * @param[in] next_header       Next header ID of payload.
  * @param[in] payload           Payload of the packet.
  * @param[in] payload_length    Length of payload.
+ *
+ * @return  payload_length : on success
+ *          -1             : if no route to the given dest could be obtained
+ *                           Packet is dropped
+ *                           In case of reactive routing: routing
+ *                           is going to try to find a route
  */
-void ipv6_sendto(const ipv6_addr_t *dest, uint8_t next_header,
+int ipv6_sendto(const ipv6_addr_t *dest, uint8_t next_header,
                  const uint8_t *payload, uint16_t payload_length);
 
 /**
diff --git a/sys/net/network_layer/sixlowpan/ip.c b/sys/net/network_layer/sixlowpan/ip.c
index d2f595d774..fb89018551 100644
--- a/sys/net/network_layer/sixlowpan/ip.c
+++ b/sys/net/network_layer/sixlowpan/ip.c
@@ -99,7 +99,7 @@ uint8_t *get_payload_buf(uint8_t ext_len)
     return &(buffer[LLHDR_IPV6HDR_LEN + ext_len]);
 }
 
-void ipv6_sendto(const ipv6_addr_t *dest, uint8_t next_header,
+int ipv6_sendto(const ipv6_addr_t *dest, uint8_t next_header,
                  const uint8_t *payload, uint16_t payload_length)
 {
     uint8_t *p_ptr;
@@ -137,11 +137,13 @@ void ipv6_sendto(const ipv6_addr_t *dest, uint8_t next_header,
     }
 
     if (dest == NULL) {
-        return;
+        return -1;
     }
 
     sixlowpan_lowpan_sendto((ieee_802154_long_t *) &dest->uint16[4],
                             (uint8_t *)ipv6_buf, packet_length);
+
+    return payload_length;
 }
 
 /* Register an upper layer thread */
diff --git a/sys/net/transport_layer/destiny/socket.c b/sys/net/transport_layer/destiny/socket.c
index 0a0594f2e8..ceb63d4314 100644
--- a/sys/net/transport_layer/destiny/socket.c
+++ b/sys/net/transport_layer/destiny/socket.c
@@ -494,16 +494,14 @@ int send_tcp(socket_internal_t *current_socket, tcp_hdr_t *current_tcp_packet,
         return -1;
     }
 
-    ipv6_sendto(&current_tcp_socket->foreign_address.sin6_addr,
+    return ipv6_sendto(&current_tcp_socket->foreign_address.sin6_addr,
                 IPPROTO_TCP, (uint8_t *)(current_tcp_packet),
                 compressed_size);
-    return 1;
 #else
     switch_tcp_packet_byte_order(current_tcp_packet);
-    ipv6_sendto(&current_tcp_socket->foreign_address.sin6_addr,
+    return ipv6_sendto(&current_tcp_socket->foreign_address.sin6_addr,
                 IPPROTO_TCP, (uint8_t *)(current_tcp_packet),
                 header_length * 4 + payload_length);
-    return 1;
 #endif
 }
 
@@ -1030,10 +1028,9 @@ int32_t destiny_socket_sendto(int s, const void *buf, uint32_t len, int flags,
                                                    UDP_HDR_LEN + len,
                                                    IPPROTO_UDP);
 
-        ipv6_sendto(&to->sin6_addr, IPPROTO_UDP,
+        return ipv6_sendto(&to->sin6_addr, IPPROTO_UDP,
                     (uint8_t *)(current_udp_packet),
                     NTOHS(current_udp_packet->length));
-        return NTOHS(current_udp_packet->length);
     }
     else {
         return -1;