Add support of RPL Option (http://tools.ietf.org/html/draft-ietf-6man-rpl-option-03):

- Auto-insersion when forwarding messages
- Delete messages with 2 rank errors
Not supported yet :
- Routing depending on InstanceID
- DAO inconsistency loop recovery
- Full UDP or TCP support (Bugs in µIPv6)
- Real Option Type (TBD by IANA)

core/net/tcpip.c

@@ -80,7 +80,8 @@ extern struct uip_fallback_interface UIP_FALLBACK_INTERFACE;
 #endif
 #if UIP_CONF_IPV6_RPL
 void rpl_init(void);
-#endif
+int rpl_update_header_final(uip_ipaddr_t *addr);
+#endif /* UIP_CONF_IPV6_RPL */
 process_event_t tcpip_event;
 #if UIP_CONF_ICMP6
 process_event_t tcpip_icmp6_event;
@@ -590,6 +591,12 @@ tcpip_ipv6_output(void)
       }
     }
     /* end of next hop determination */
+#if UIP_CONF_IPV6_RPL
+    if (rpl_update_header_final(nexthop)) {
+      uip_len = 0;
+      return;
+    }
+#endif /* UIP_CONF_IPV6_RPL */
     if((nbr = uip_ds6_nbr_lookup(nexthop)) == NULL) {
       //      printf("add1 %d\n", nexthop->u8[15]);
       if((nbr = uip_ds6_nbr_add(nexthop, NULL, 0, NBR_INCOMPLETE)) == NULL) {

core/net/uip-icmp6.c

@@ -60,14 +60,25 @@
 #define UIP_IP_BUF                ((struct uip_ip_hdr *)&uip_buf[UIP_LLH_LEN])
 #define UIP_ICMP_BUF            ((struct uip_icmp_hdr *)&uip_buf[uip_l2_l3_hdr_len])
 #define UIP_ICMP6_ERROR_BUF  ((struct uip_icmp6_error *)&uip_buf[uip_l2_l3_icmp_hdr_len])
+#if UIP_CONF_IPV6_RPL
+#define UIP_EXT_BUF              ((struct uip_ext_hdr *)&uip_buf[uip_l2_l3_hdr_len])
+#define UIP_FIRST_EXT_BUF        ((struct uip_ext_hdr *)&uip_buf[UIP_LLIPH_LEN])
+#endif /* UIP_CONF_IPV6_RPL */
 
 /** \brief temporary IP address */
 static uip_ipaddr_t tmp_ipaddr;
 
+#if UIP_CONF_IPV6_RPL
+int  rpl_invert_header(void);
+#endif /* UIP_CONF_IPV6_RPL */
+
 /*---------------------------------------------------------------------------*/
 void
 uip_icmp6_echo_request_input(void)
 {
+#if UIP_CONF_IPV6_RPL
+  u8_t temp_ext_len;
+#endif /* UIP_CONF_IPV6_RPL */
   /*
    * we send an echo reply. It is trivial if there was no extension
    * headers in the request otherwise we need to remove the extension
@@ -92,6 +103,26 @@ uip_icmp6_echo_request_input(void)
   }
 
   if(uip_ext_len > 0) {
+#if UIP_CONF_IPV6_RPL
+    if ((temp_ext_len=rpl_invert_header())) {
+      /* If there were other extension headers*/
+      UIP_FIRST_EXT_BUF->next = UIP_PROTO_ICMP6;
+      if (uip_ext_len != temp_ext_len) {
+        uip_len -= (uip_ext_len - temp_ext_len);
+        UIP_IP_BUF->len[0] = ((uip_len - UIP_IPH_LEN) >> 8);
+        UIP_IP_BUF->len[1] = ((uip_len - UIP_IPH_LEN) & 0xff);
+        /* move the echo request payload (starting after the icmp header)
+         * to the new location in the reply.
+         * The shift is equal to the length of the remaining extension headers present
+         * Note: UIP_ICMP_BUF still points to the echo request at this stage
+         */
+      memmove((uint8_t *)UIP_ICMP_BUF + UIP_ICMPH_LEN - (uip_ext_len - temp_ext_len),
+              (uint8_t *)UIP_ICMP_BUF + UIP_ICMPH_LEN,
+              (uip_len - UIP_IPH_LEN - temp_ext_len - UIP_ICMPH_LEN));
+      }
+      uip_ext_len=temp_ext_len;
+    } else {
+#endif /* UIP_CONF_IPV6_RPL */
       /* If there were extension headers*/
       UIP_IP_BUF->proto = UIP_PROTO_ICMP6;
       uip_len -= uip_ext_len;
@@ -105,11 +136,15 @@ uip_icmp6_echo_request_input(void)
       memmove((uint8_t *)UIP_ICMP_BUF + UIP_ICMPH_LEN - uip_ext_len,
               (uint8_t *)UIP_ICMP_BUF + UIP_ICMPH_LEN,
               (uip_len - UIP_IPH_LEN - UIP_ICMPH_LEN));
+      uip_ext_len = 0;
+#if UIP_CONF_IPV6_RPL
+    }
+#endif /* UIP_CONF_IPV6_RPL */
   }
   /* Below is important for the correctness of UIP_ICMP_BUF and the
    * checksum
    */
-  uip_ext_len = 0;
+
   /* Note: now UIP_ICMP_BUF points to the beginning of the echo reply */
   UIP_ICMP_BUF->type = ICMP6_ECHO_REPLY;
   UIP_ICMP_BUF->icode = 0;
@@ -127,13 +162,25 @@ uip_icmp6_echo_request_input(void)
 /*---------------------------------------------------------------------------*/
 void
 uip_icmp6_error_output(u8_t type, u8_t code, u32_t param) {
-  uip_ext_len = 0;
 
  /* check if originating packet is not an ICMP error*/
+  if (uip_ext_len) {
+    if(UIP_EXT_BUF->next == UIP_PROTO_ICMP6 && UIP_ICMP_BUF->type < 128){
+      uip_len = 0;
+      return;
+    }
+  } else {
     if(UIP_IP_BUF->proto == UIP_PROTO_ICMP6 && UIP_ICMP_BUF->type < 128){
       uip_len = 0;
       return;
     }
+  }
+
+#if UIP_CONF_IPV6_RPL
+  uip_ext_len = rpl_invert_header();
+#else /* UIP_CONF_IPV6_RPL */
+  uip_ext_len = 0;
+#endif /* UIP_CONF_IPV6_RPL */
 
   /* remember data of original packet before shifting */
   uip_ipaddr_copy(&tmp_ipaddr, &UIP_IP_BUF->destipaddr);
@@ -143,13 +190,17 @@ uip_icmp6_error_output(u8_t type, u8_t code, u32_t param) {
   if(uip_len > UIP_LINK_MTU)
     uip_len = UIP_LINK_MTU;
 
-  memmove((uint8_t *)UIP_ICMP6_ERROR_BUF + UIP_ICMP6_ERROR_LEN,
-          (void *)UIP_IP_BUF, uip_len - UIP_IPICMPH_LEN - UIP_ICMP6_ERROR_LEN);
+  memmove((uint8_t *)UIP_ICMP6_ERROR_BUF + uip_ext_len + UIP_ICMP6_ERROR_LEN,
+          (void *)UIP_IP_BUF, uip_len - UIP_IPICMPH_LEN - uip_ext_len - UIP_ICMP6_ERROR_LEN);
 
   UIP_IP_BUF->vtc = 0x60;
   UIP_IP_BUF->tcflow = 0;
   UIP_IP_BUF->flow = 0;
+  if (uip_ext_len) {
+    UIP_FIRST_EXT_BUF->next = UIP_PROTO_ICMP6;
+  } else {
     UIP_IP_BUF->proto = UIP_PROTO_ICMP6;
+  }
   UIP_IP_BUF->ttl = uip_ds6_if.cur_hop_limit;
 
   /* the source should not be unspecified nor multicast, the check for

core/net/uip.h

@@ -1770,6 +1770,17 @@ typedef struct uip_ext_hdr_opt_padn {
   u8_t opt_len;
 } uip_ext_hdr_opt_padn;
 
+#if UIP_CONF_IPV6_RPL
+/* RPL option */
+typedef struct uip_ext_hdr_opt_rpl {
+  u8_t opt_type;
+  u8_t opt_len;
+  u8_t flags;
+  u8_t instance;
+  u16_t senderrank;
+} uip_ext_hdr_opt_rpl;
+#endif /* UIP_CONF_IPV6_RPL */
+
 /* TCP header */
 struct uip_tcp_hdr {
   u16_t srcport;
@@ -1840,6 +1851,10 @@ struct uip_udp_hdr {
 /** \brief  Destination and Hop By Hop extension headers option types */
 #define UIP_EXT_HDR_OPT_PAD1  0
 #define UIP_EXT_HDR_OPT_PADN  1
+#if UIP_CONF_IPV6_RPL
+#define UIP_EXT_HDR_OPT_RPL   0x63
+#endif /* UIP_CONF_IPV6_RPL */
+
 /** @} */
 
 /** @{ */

core/net/uip6.c

@@ -96,6 +96,8 @@
 
 #if UIP_CONF_IPV6_RPL
 void uip_rpl_input(void);
+void rpl_update_header_empty(void);
+int rpl_verify_header(int uip_ext_opt_offset);
 #endif /* UIP_CONF_IPV6_RPL */
 
 #if UIP_LOGGING == 1
@@ -163,6 +165,9 @@ u8_t uip_ext_opt_offset = 0;
 #define UIP_DESTO_BUF                    ((struct uip_desto_hdr *)&uip_buf[uip_l2_l3_hdr_len])
 #define UIP_EXT_HDR_OPT_BUF            ((struct uip_ext_hdr_opt *)&uip_buf[uip_l2_l3_hdr_len + uip_ext_opt_offset])
 #define UIP_EXT_HDR_OPT_PADN_BUF  ((struct uip_ext_hdr_opt_padn *)&uip_buf[uip_l2_l3_hdr_len + uip_ext_opt_offset])
+#if UIP_CONF_IPV6_RPL
+#define UIP_EXT_HDR_OPT_RPL_BUF    ((struct uip_ext_hdr_opt_rpl *)&uip_buf[uip_l2_l3_hdr_len + uip_ext_opt_offset])
+#endif /* UIP_CONF_IPV6_RPL */
 #define UIP_ICMP6_ERROR_BUF            ((struct uip_icmp6_error *)&uip_buf[uip_l2_l3_icmp_hdr_len])
 /** @} */
 /** \name Buffer variables
@@ -827,6 +832,16 @@ ext_hdr_options_process() {
         PRINTF("Processing PADN option\n");
         uip_ext_opt_offset += UIP_EXT_HDR_OPT_PADN_BUF->opt_len + 2;
         break;
+#if UIP_CONF_IPV6_RPL
+      case UIP_EXT_HDR_OPT_RPL:
+        PRINTF("Processing RPL option\n");
+        if (rpl_verify_header(uip_ext_opt_offset)) {
+          PRINTF("RPL Option Error : Dropping Packet");
+          return 1;
+        }
+        uip_ext_opt_offset += (UIP_EXT_HDR_OPT_RPL_BUF->opt_len) + 2;
+        return 0;
+#endif /* UIP_CONF_IPV6_RPL */
       default:
         /*
          * check the two highest order bits of the option
@@ -1078,6 +1093,35 @@ uip_process(u8_t flag)
   }
 
 #if UIP_CONF_ROUTER
+  /*
+   * Next header field processing. In IPv6, we can have extension headers,
+   * if present, the Hop-by-Hop Option must be processed before forwarding
+   * the packet.
+   */
+  uip_next_hdr = &UIP_IP_BUF->proto;
+  uip_ext_len = 0;
+  uip_ext_bitmap = 0;
+  if (*uip_next_hdr == UIP_PROTO_HBHO) {
+#if UIP_CONF_IPV6_CHECKS
+    uip_ext_bitmap |= UIP_EXT_HDR_BITMAP_HBHO;
+#endif /*UIP_CONF_IPV6_CHECKS*/
+    switch(ext_hdr_options_process()) {
+      case 0:
+        /*continue*/
+        uip_next_hdr = &UIP_EXT_BUF->next;
+        uip_ext_len += (UIP_EXT_BUF->len << 3) + 8;
+        break;
+      case 1:
+        /*silently discard*/
+        goto drop;
+      case 2:
+        /* send icmp error message (created in ext_hdr_options_process)
+         * and discard*/
+        goto send;
+    }
+  }
+
+
   /* TBD Some Parameter problem messages */
   if(!uip_ds6_is_my_addr(&UIP_IP_BUF->destipaddr) &&
      !uip_ds6_is_my_maddr(&UIP_IP_BUF->destipaddr)) {
@@ -1101,6 +1145,11 @@ uip_process(u8_t flag)
         UIP_STAT(++uip_stat.ip.drop);
         goto send;
       }
+
+#if UIP_CONF_IPV6_RPL
+      rpl_update_header_empty();
+#endif /* UIP_CONF_IPV6_RPL */
+
       UIP_IP_BUF->ttl = UIP_IP_BUF->ttl - 1;
       PRINTF("Forwarding packet to ");
       PRINT6ADDR(&UIP_IP_BUF->destipaddr);
@@ -1131,7 +1180,6 @@ uip_process(u8_t flag)
     UIP_STAT(++uip_stat.ip.drop);
     goto drop;
   }
-#endif /* UIP_CONF_ROUTER */
 
   /*
    * Next header field processing. In IPv6, we can have extension headers,
@@ -1140,6 +1188,8 @@ uip_process(u8_t flag)
   uip_next_hdr = &UIP_IP_BUF->proto;
   uip_ext_len = 0;
   uip_ext_bitmap = 0;
+#endif /* UIP_CONF_ROUTER */
+
   while(1) {
     switch(*uip_next_hdr){
 #if UIP_TCP