Implement dhcp-ignore-names and DNSMASQ_RELAY_ADDRESS for IPv6

Build DHCPv6 by default.

man/dnsmasq.8

@@ -820,7 +820,7 @@ agent ID and one provided by a relay agent, the tag is set.
 (IPv4 and IPv6) Map from RFC3993 subscriber-id relay agent options to tags.
 .TP
 .B --dhcp-proxy[=<ip addr>]......
-A normal DHCP relay agent is only used to forward the initial parts of
+(IPv4 only) A normal DHCP relay agent is only used to forward the initial parts of
 a DHCP interaction to the DHCP server. Once a client is configured, it
 communicates directly with the server. This is undesirable if the
 relay agent is addding extra information to the DHCP packets, such as

src/config.h

@@ -116,7 +116,7 @@ RESOLVFILE
    has no library dependencies other than libc */
 
 #define HAVE_DHCP
-/* #define HAVE_DHCP6 */ 
+#define HAVE_DHCP6 
 #define HAVE_TFTP
 #define HAVE_SCRIPT
 /* #define HAVE_LUASCRIPT */

src/dhcp6.c

@@ -292,8 +292,12 @@ int address6_allocate(struct dhcp_context *context,  unsigned char *clid, int cl
       else if (!match_netid(c->filter, netids, pass))
 	continue;
       else
-	{
-	  start = addr6part(&c->start6) + ((j + c->addr_epoch + serial) % (1 + addr6part(&c->end6) - addr6part(&c->start6)));
+	{ 
+	  if (option_bool(OPT_CONSEC_ADDR))
+	    /* seed is largest extant lease addr in this context */
+	    start = lease_find_max_addr6(c) + serial;
+	  else
+	    start = addr6part(&c->start6) + ((j + c->addr_epoch + serial) % (1 + addr6part(&c->end6) - addr6part(&c->start6)));
 
 	  /* iterate until we find a free address. */
 	  addr = start;

src/dnsmasq.h

@@ -928,6 +928,7 @@ struct dhcp_lease *lease6_allocate(struct in6_addr *addrp, int lease_type);
 struct dhcp_lease *lease6_find(unsigned char *clid, int clid_len, 
 			       int lease_type, int iaid, struct in6_addr *addr);
 struct dhcp_lease *lease6_find_by_addr(struct in6_addr *net, int prefix, u64 addr);
+u64 lease_find_max_addr6(struct dhcp_context *context);
 #endif
 void lease_set_hwaddr(struct dhcp_lease *lease, unsigned char *hwaddr,
 		      unsigned char *clid, int hw_len, int hw_type, int clid_len);

src/helper.c

@@ -490,6 +490,9 @@ int create_helper(int event_fd, int err_fd, uid_t uid, gid_t gid, long max_fd)
 	}
       
       buf = grab_extradata(buf, end, "DNSMASQ_TAGS", &err);
+
+      if (is6)
+	buf = grab_extradata(buf, end, "DNSMASQ_RELAY_ADDRESS", &err);
       
       for (i = 0; buf; i++)
 	{

src/lease.c

@@ -493,7 +493,31 @@ struct dhcp_lease *lease6_find_by_addr(struct in6_addr *net, int prefix, u64 add
     }
   
   return NULL;
-}  
+} 
+
+/* Find largest assigned address in context */
+u64 lease_find_max_addr6(struct dhcp_context *context)
+{
+  struct dhcp_lease *lease;
+  u64 addr = addr6part(&context->start6);
+  
+  if (!(context->flags & (CONTEXT_STATIC | CONTEXT_PROXY)))
+    for (lease = leases; lease; lease = lease->next)
+      {
+#ifdef HAVE_DHCP6
+	if (!(lease->flags & (LEASE_TA | LEASE_NA)))
+	  continue;
+#endif
+	if (is_same_net6((struct in6_addr *)lease->hwaddr, &context->start6, 64) &&
+	    addr6part((struct in6_addr *)lease->hwaddr) > addr6part(&context->start6) &&
+	    addr6part((struct in6_addr *)lease->hwaddr) <= addr6part(&context->end6) &&
+	    addr6part((struct in6_addr *)lease->hwaddr) > addr)
+	  addr = addr6part((struct in6_addr *)lease->hwaddr);
+      }
+  
+  return addr;
+}
+
 #endif
 
 /* Find largest assigned address in context */

src/rfc3315.c

@@ -32,7 +32,7 @@ static void put_opt6_string(char *s);
 
 static int dhcp6_maybe_relay(struct in6_addr *link_address, struct dhcp_netid **relay_tagsp, struct dhcp_context *context, 
 			     int interface, char *iface_name, void *inbuff, size_t sz, int is_unicast, time_t now);
-static int dhcp6_no_relay(int msg_type,  struct dhcp_netid *tags, struct dhcp_context *context, 
+static int dhcp6_no_relay(int msg_type,  struct in6_addr *link_address, struct dhcp_netid *tags, struct dhcp_context *context, 
 			  int interface, char *iface_name, void *inbuff, size_t sz, int is_unicast, time_t now);
 static void log6_packet(char *type, unsigned char *clid, int clid_len, struct in6_addr *addr, int xid, char *iface, char *string);
 
@@ -114,7 +114,7 @@ static int dhcp6_maybe_relay(struct in6_addr *link_address, struct dhcp_netid **
 	  return 0;
 	}
 
-      return dhcp6_no_relay(msg_type, *relay_tagsp, context, interface, iface_name, inbuff, sz, is_unicast, now);
+      return dhcp6_no_relay(msg_type, link_address, *relay_tagsp, context, interface, iface_name, inbuff, sz, is_unicast, now);
     }
 
   /* must have at least msg_type+hopcount+link_address+peer_address+minimal size option
@@ -170,7 +170,7 @@ static int dhcp6_maybe_relay(struct in6_addr *link_address, struct dhcp_netid **
   return 1;
 }
 
-static int dhcp6_no_relay(int msg_type, struct dhcp_netid *tags, struct dhcp_context *context, 
+static int dhcp6_no_relay(int msg_type, struct in6_addr *link_address, struct dhcp_netid *tags, struct dhcp_context *context, 
 			  int interface, char *iface_name, void *inbuff, size_t sz, int is_unicast, time_t now)
 {
   void *packet_options = inbuff + 4;
@@ -670,6 +670,11 @@ static int dhcp6_no_relay(int msg_type, struct dhcp_netid *tags, struct dhcp_con
 					  lease_add_extradata(lease, (unsigned char *)n->net, strlen(n->net), n->next ? ' ' : 0); 
 				      }
 				  }
+
+				if (link_address)
+				  inet_ntop(AF_INET6, link_address, daemon->addrbuff, ADDRSTRLEN);
+				
+				lease_add_extradata(lease, (unsigned char *)daemon->addrbuff, link_address ? strlen(daemon->addrbuff) : 0, 0);
 				  
 				if ((class_opt = opt6_find(packet_options, end, OPTION6_USER_CLASS, 2)))
 				  {
@@ -1206,6 +1211,19 @@ static int dhcp6_no_relay(int msg_type, struct dhcp_netid *tags, struct dhcp_con
 	    }
 	}
     }      
+
+
+  /* if all the netids in the ignore_name list are present, ignore client-supplied name */
+  if (!hostname_auth)
+    {
+       struct dhcp_netid_list *id_list;
+       
+       for (id_list = daemon->dhcp_ignore_names; id_list; id_list = id_list->next)
+	 if ((!id_list->list) || match_netid(id_list->list, tagif, 0))
+	   break;
+       if (id_list)
+	 hostname = NULL;
+    }
   
   if (hostname)
     {