[ipv6] Add ndp_tx_router_solicitation() to send router solicitations

Signed-off-by: Michael Brown <mcb30@ipxe.org>

3 files changed, 29 insertions, 4 deletions

diff --git a/src/include/ipxe/icmpv6.h b/src/include/ipxe/icmpv6.h
index 15f8edd83..b5ea54eab 100644
--- a/src/include/ipxe/icmpv6.h
+++ b/src/include/ipxe/icmpv6.h
@@ -46,6 +46,9 @@ struct icmpv6_handler {
 /** ICMPv6 echo reply */
 #define ICMPV6_ECHO_REPLY 129
 
+/** ICMPv6 router solicitation */
+#define ICMPV6_ROUTER_SOLICITATION 133
+
 /** ICMPv6 router advertisement */
 #define ICMPV6_ROUTER_ADVERTISEMENT 134
 
diff --git a/src/include/ipxe/ipv6.h b/src/include/ipxe/ipv6.h
index 6a9aa606c..3cb878262 100644
--- a/src/include/ipxe/ipv6.h
+++ b/src/include/ipxe/ipv6.h
@@ -194,14 +194,13 @@ static inline int ipv6_eui64 ( struct in6_addr *addr,
 /**
  * Construct link-local address via EUI-64
  *
- * @v addr		Address to construct
+ * @v addr		Zeroed address to construct
  * @v netdev		Network device
  * @ret prefix_len	Prefix length, or negative error
  */
 static inline int ipv6_link_local ( struct in6_addr *addr,
 				    struct net_device *netdev ) {
 
-	memset ( addr, 0, sizeof ( *addr ) );
 	addr->s6_addr16[0] = htons ( 0xfe80 );
 	return ipv6_eui64 ( addr, netdev );
 }
@@ -209,19 +208,28 @@ static inline int ipv6_link_local ( struct in6_addr *addr,
 /**
  * Construct solicited-node multicast address
  *
- * @v addr		Address to construct
+ * @v addr		Zeroed address to construct
  * @v unicast		Unicast address
  */
 static inline void ipv6_solicited_node ( struct in6_addr *addr,
 					 const struct in6_addr *unicast ) {
 
-	memset ( addr, 0, sizeof ( *addr ) );
 	addr->s6_addr16[0] = htons ( 0xff02 );
 	addr->s6_addr[11] = 1;
 	addr->s6_addr[12] = 0xff;
 	memcpy ( &addr->s6_addr[13], &unicast->s6_addr[13], 3 );
 }
 
+/**
+ * Construct all-routers multicast address
+ *
+ * @v addr		Zeroed address to construct
+ */
+static inline void ipv6_all_routers ( struct in6_addr *addr ) {
+	addr->s6_addr16[0] = htons ( 0xff02 );
+	addr->s6_addr[15] = 2;
+}
+
 extern struct list_head ipv6_miniroutes;
 
 extern struct net_protocol ipv6_protocol __net_protocol;
diff --git a/src/include/ipxe/ndp.h b/src/include/ipxe/ndp.h
index 4edd96a40..f8c7e3fb3 100644
--- a/src/include/ipxe/ndp.h
+++ b/src/include/ipxe/ndp.h
@@ -124,12 +124,24 @@ struct ndp_router_advertisement_header {
 /** NDP other configuration */
 #define NDP_ROUTER_OTHER 0x40
 
+/** An NDP router solicitation header */
+struct ndp_router_solicitation_header {
+	/** ICMPv6 header */
+	struct icmp_header icmp;
+	/** Reserved */
+	uint32_t reserved;
+	/** Options */
+	union ndp_option option[0];
+} __attribute__ (( packed ));
+
 /** An NDP header */
 union ndp_header {
 	/** ICMPv6 header */
 	struct icmp_header icmp;
 	/** Neighbour solicitation or advertisement header */
 	struct ndp_neighbour_header neigh;
+	/** Router solicitation header */
+	struct ndp_router_solicitation_header rsol;
 	/** Router advertisement header */
 	struct ndp_router_advertisement_header radv;
 } __attribute__ (( packed ));
@@ -154,4 +166,6 @@ static inline int ndp_tx ( struct io_buffer *iobuf, struct net_device *netdev,
 			      &ndp_discovery, net_source, ll_source );
 }
 
+extern int ndp_tx_router_solicitation ( struct net_device *netdev );
+
 #endif /* _IPXE_NDP_H */