[ipv6] Support stateless address autoconfiguration (SLAAC)

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

2 files changed, 76 insertions, 18 deletions

diff --git a/src/include/ipxe/ipv6.h b/src/include/ipxe/ipv6.h
index f404ba6..6a9aa60 100644
--- a/src/include/ipxe/ipv6.h
+++ b/src/include/ipxe/ipv6.h
@@ -173,20 +173,18 @@ struct ipv6_miniroute {
 };
 
 /**
- * Construct link-local address (via EUI-64)
+ * Construct local IPv6 address via EUI-64
  *
- * @v addr		Address to construct
+ * @v addr		Prefix to be completed
  * @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 ) {
+static inline int ipv6_eui64 ( struct in6_addr *addr,
+			       struct net_device *netdev ) {
 	struct ll_protocol *ll_protocol = netdev->ll_protocol;
 	const void *ll_addr = netdev->ll_addr;
 	int rc;
 
-	memset ( addr, 0, sizeof ( *addr ) );
-	addr->s6_addr16[0] = htons ( 0xfe80 );
 	if ( ( rc = ll_protocol->eui64 ( ll_addr, &addr->s6_addr[8] ) ) != 0 )
 		return rc;
 	addr->s6_addr[8] ^= 0x02;
@@ -194,6 +192,21 @@ static inline int ipv6_link_local ( struct in6_addr *addr,
 }
 
 /**
+ * Construct link-local address via EUI-64
+ *
+ * @v addr		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 );
+}
+
+/**
  * Construct solicited-node multicast address
  *
  * @v addr		Address to construct
@@ -214,5 +227,7 @@ extern struct list_head ipv6_miniroutes;
 extern struct net_protocol ipv6_protocol __net_protocol;
 
 extern int ipv6_has_addr ( struct net_device *netdev, struct in6_addr *addr );
+extern int ipv6_slaac ( struct net_device *netdev, struct in6_addr *prefix,
+			unsigned int prefix_len, struct in6_addr *router );
 
 #endif /* _IPXE_IPV6_H */
diff --git a/src/include/ipxe/ndp.h b/src/include/ipxe/ndp.h
index 92f6da5..4edd96a 100644
--- a/src/include/ipxe/ndp.h
+++ b/src/include/ipxe/ndp.h
@@ -15,19 +15,68 @@ FILE_LICENCE ( GPL2_OR_LATER );
 #include <ipxe/icmpv6.h>
 #include <ipxe/neighbour.h>
 
-/** An NDP option */
-struct ndp_option {
+/** An NDP option header */
+struct ndp_option_header {
 	/** Type */
 	uint8_t type;
 	/** Length (in blocks of 8 bytes) */
 	uint8_t blocks;
-	/** Value */
-	uint8_t value[0];
 } __attribute__ (( packed ));
 
 /** NDP option block size */
 #define NDP_OPTION_BLKSZ 8
 
+/** NDP source link-layer address option */
+#define NDP_OPT_LL_SOURCE 1
+
+/** NDP target link-layer address option */
+#define NDP_OPT_LL_TARGET 2
+
+/** NDP source or target link-layer address option */
+struct ndp_ll_addr_option {
+	/** NDP option header */
+	struct ndp_option_header header;
+	/** Link-layer address */
+	uint8_t ll_addr[0];
+} __attribute__ (( packed ));
+
+/** NDP prefix information option */
+#define NDP_OPT_PREFIX 3
+
+/** NDP prefix information */
+struct ndp_prefix_information_option {
+	/** NDP option header */
+	struct ndp_option_header header;
+	/** Prefix length */
+	uint8_t prefix_len;
+	/** Flags */
+	uint8_t flags;
+	/** Valid lifetime */
+	uint32_t valid;
+	/** Preferred lifetime */
+	uint32_t preferred;
+	/** Reserved */
+	uint32_t reserved;
+	/** Prefix */
+	struct in6_addr prefix;
+} __attribute__ (( packed ));
+
+/** NDP on-link flag */
+#define NDP_PREFIX_ON_LINK 0x80
+
+/** NDP autonomous address configuration flag */
+#define NDP_PREFIX_AUTONOMOUS 0x40
+
+/** An NDP option */
+union ndp_option {
+	/** Option header */
+	struct ndp_option_header header;
+	/** Source or target link-layer address option */
+	struct ndp_ll_addr_option ll_addr;
+	/** Prefix information option */
+	struct ndp_prefix_information_option prefix;
+} __attribute__ (( packed ));
+
 /** An NDP neighbour solicitation or advertisement header */
 struct ndp_neighbour_header {
 	/** ICMPv6 header */
@@ -39,7 +88,7 @@ struct ndp_neighbour_header {
 	/** Target address */
 	struct in6_addr target;
 	/** Options */
-	struct ndp_option option[0];
+	union ndp_option option[0];
 } __attribute__ (( packed ));
 
 /** NDP router flag */
@@ -66,7 +115,7 @@ struct ndp_router_advertisement_header {
 	/** Retransmission timer */
 	uint32_t retransmit;
 	/** Options */
-	struct ndp_option option[0];
+	union ndp_option option[0];
 } __attribute__ (( packed ));
 
 /** NDP managed address configuration */
@@ -85,12 +134,6 @@ union ndp_header {
 	struct ndp_router_advertisement_header radv;
 } __attribute__ (( packed ));
 
-/** NDP source link-layer address option */
-#define NDP_OPT_LL_SOURCE 1
-
-/** NDP target link-layer address option */
-#define NDP_OPT_LL_TARGET 2
-
 extern struct neighbour_discovery ndp_discovery;
 
 /**