Included switch LWIP_UDPLITE (enabled by default) to switch off UDP-Lite support if not needed (reduces udp.c code size)

CHANGELOG

@@ -19,6 +19,11 @@ HISTORY
 
   ++ New features:
 
+  2007-06-10 Simon Goldschmidt
+  * udp.h, opt.h, api_msg.c, ip.c, udp.c: Included switch LWIP_UDPLITE (enabled
+    by default) to switch off UDP-Lite support if not needed (reduces udp.c code
+    size)
+
   2007-06-09 Dominik Spies (integrated by Frédéric Bernon)
   * autoip.h, autoip.c, dhcp.h, dhcp.c, netif.h, netif.c, etharp.h, etharp.c, opt.h:
     AutoIP implementation available for IPv4, with new options LWIP_AUTOIP and

src/api/api_msg.c

@@ -308,7 +308,9 @@ pcb_new(struct api_msg_msg *msg)
        msg->conn->err = ERR_MEM;
        break;
      }
+#if LWIP_UDPLITE
      if (msg->conn->type==NETCONN_UDPLITE)     udp_setflags(msg->conn->pcb.udp, UDP_FLAGS_UDPLITE);
+#endif
      if (msg->conn->type==NETCONN_UDPNOCHKSUM) udp_setflags(msg->conn->pcb.udp, UDP_FLAGS_NOCHKSUM);
      udp_recv(msg->conn->pcb.udp, recv_udp, msg->conn);
      break;

src/core/ipv4/ip.c

@@ -365,7 +365,9 @@ ip_input(struct pbuf *p, struct netif *inp) {
   switch (IPH_PROTO(iphdr)) {
 #if LWIP_UDP
   case IP_PROTO_UDP:
+#if LWIP_UDPLITE
   case IP_PROTO_UDPLITE:
+#endif
     snmp_inc_ipindelivers();
     udp_input(p, inp);
     break;

src/core/udp.c

@@ -178,6 +178,7 @@ udp_input(struct pbuf *p, struct netif *inp)
   /* Check checksum if this is a match or if it was directed at us. */
   if (pcb != NULL || ip_addr_cmp(&inp->ip_addr, &iphdr->dest)) {
     LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_input: calculating checksum\n"));
+#if LWIP_UDPLITE
     if (IPH_PROTO(iphdr) == IP_PROTO_UDPLITE) {
       /* Do the UDP Lite checksum */
 #if CHECKSUM_CHECK_UDP
@@ -192,8 +193,10 @@ udp_input(struct pbuf *p, struct netif *inp)
         pbuf_free(p);
         goto end;
       }
-#endif
+#endif /* CHECKSUM_CHECK_UDP */
-    } else {
+    } else
+#endif /* LWIP_UDPLITE */
+    {
 #if CHECKSUM_CHECK_UDP
       if (udphdr->chksum != 0) {
         if (inet_chksum_pseudo(p, (struct ip_addr *)&(iphdr->src),
@@ -208,7 +211,7 @@ udp_input(struct pbuf *p, struct netif *inp)
           goto end;
         }
       }
-#endif
+#endif /* CHECKSUM_CHECK_UDP */
     }
     if(pbuf_header(p, -UDP_HLEN)) {
       /* Can we cope with this failing? Just assert for now */
@@ -389,6 +392,7 @@ udp_send(struct udp_pcb *pcb, struct pbuf *p)
 
   LWIP_DEBUGF(UDP_DEBUG, ("udp_send: sending datagram of length %"U16_F"\n", q->tot_len));
 
+#if LWIP_UDPLITE
   /* UDP Lite protocol? */
   if (pcb->flags & UDP_FLAGS_UDPLITE) {
     LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP LITE packet length %"U16_F"\n", q->tot_len));
@@ -401,13 +405,15 @@ udp_send(struct udp_pcb *pcb, struct pbuf *p)
     /* chksum zero must become 0xffff, as zero means 'no checksum' */
     if (udphdr->chksum == 0x0000)
       udphdr->chksum = 0xffff;
-#else
+#else /* CHECKSUM_CHECK_UDP */
     udphdr->chksum = 0x0000;
-#endif
+#endif /* CHECKSUM_CHECK_UDP */
     /* output to IP */
     LWIP_DEBUGF(UDP_DEBUG, ("udp_send: ip_output_if (,,,,IP_PROTO_UDPLITE,)\n"));
     err = ip_output_if(q, src_ip, &pcb->remote_ip, pcb->ttl, pcb->tos, IP_PROTO_UDPLITE, netif);    
-  } else {      /* UDP */
+  } else
+#endif /* LWIP_UDPLITE */
+  {      /* UDP */
     LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP packet length %"U16_F"\n", q->tot_len));
     udphdr->len = htons(q->tot_len);
     /* calculate checksum */
@@ -417,9 +423,9 @@ udp_send(struct udp_pcb *pcb, struct pbuf *p)
       /* chksum zero must become 0xffff, as zero means 'no checksum' */
       if (udphdr->chksum == 0x0000) udphdr->chksum = 0xffff;
     }
-#else
+#else /* CHECKSUM_CHECK_UDP */
     udphdr->chksum = 0x0000;
-#endif
+#endif /* CHECKSUM_CHECK_UDP */
     LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP checksum 0x%04"X16_F"\n", udphdr->chksum));
     LWIP_DEBUGF(UDP_DEBUG, ("udp_send: ip_output_if (,,,,IP_PROTO_UDP,)\n"));
     /* output to IP */

src/include/lwip/opt.h

@@ -348,6 +348,11 @@ a lot of data that needs to be copied, this should be set high. */
 #define LWIP_UDP                        1
 #endif
 
+/* Enable the UDP-Lite protocol (only makes sense if LWIP_UDP=1) */
+#ifndef LWIP_UDPLITE
+#define LWIP_UDPLITE                    1
+#endif
+
 #ifndef UDP_TTL
 #define UDP_TTL                         (IP_DEFAULT_TTL)
 #endif

src/include/lwip/udp.h

@@ -68,8 +68,10 @@ struct udp_pcb {
   /* ports are in host byte order */
   u16_t local_port, remote_port;
   
+#if LWIP_UDPLITE
   /* used for UDP_LITE only */
   u16_t chksum_len;
+#endif /* LWIP_UDPLITE */
 
   /* addr and port are in same byte order as in the pcb */
   void (* recv)(void *arg, struct udp_pcb *pcb, struct pbuf *p,