Use /proc/sys/net/ipv6/conf/<iface>/mtu for RA advertised MTU.

src/auth.c

@@ -46,6 +46,21 @@ static struct subnet *filter_zone(struct auth_zone *zone, int flag, struct all_a
   return NULL;
 }
 
+static int filter_constructed_dhcp(int flag, struct all_addr *addr_u)
+{
+#ifdef HAVE_DHCP6
+  struct dhcp_context *context;
+
+  if (flag | F_IPV6)
+    for (context = daemon->dhcp6; context; context = context->next)
+      if ((context->flags & CONTEXT_CONSTRUCTED) &&
+	  is_same_net6(&(addr_u->addr.addr6), &context->start6, context->prefix))
+	return 1;
+#endif
+  
+  return 0;
+}
+
 static int in_zone(struct auth_zone *zone, char *name, char **cut)
 {
   size_t namelen = strlen(name);
@@ -415,7 +430,8 @@ size_t answer_auth(struct dns_header *header, char *limit, size_t qlen, time_t n
 		do
 		  { 
 		    nxdomain = 0;
-		    if ((crecp->flags & flag) && filter_zone(zone, flag, &(crecp->addr.addr)))
+		    if ((crecp->flags & flag) && 
+			(filter_zone(zone, flag, &(crecp->addr.addr)) || filter_constructed_dhcp(flag, &(crecp->addr.addr))))
 		      {
 			*cut = '.'; /* restore domain part */
 			log_query(crecp->flags, name, &crecp->addr.addr, record_source(crecp->uid));

src/bpf.c

@@ -147,7 +147,8 @@ int iface_enumerate(int family, void *parm, int (*callback)())
 		  addr->s6_addr[3] = 0;
 		}
 	      
-	      if (!((*callback)(addr, prefix, scope_id, iface_index, 0, 0, 0, parm)))
+	      /* preferred and valid times == forever until we known how to dtermine them. */
+	      if (!((*callback)(addr, prefix, scope_id, iface_index, 0, -1, -1, parm)))
 		goto err;
 	}
 #endif

src/dhcp6.c

@@ -26,7 +26,7 @@ struct iface_param {
 
 static int complete_context6(struct in6_addr *local,  int prefix,
 			     int scope, int if_index, int flags, 
-			     int preferred, int valid, void *vparam);
+			     unsigned int preferred, unsigned int valid, void *vparam);
 
 static int make_duid1(int index, unsigned int type, char *mac, size_t maclen, void *parm); 
 
@@ -182,17 +182,14 @@ void dhcp6_packet(time_t now)
 }
 
 static int complete_context6(struct in6_addr *local,  int prefix,
-			     int scope, int if_index, int flags, int preferred, 
+			     int scope, int if_index, int flags, unsigned int preferred, 
-			     int valid, void *vparam)
+			     unsigned int valid, void *vparam)
 {
   struct dhcp_context *context;
   struct iface_param *param = vparam;
   struct iname *tmp;
  
   (void)scope; /* warning */
-  (void)flags;
-  (void)preferred;
-  (void)valid;
   
   if (if_index == param->ind &&
       !IN6_IS_ADDR_LOOPBACK(local) &&
@@ -219,12 +216,32 @@ static int complete_context6(struct in6_addr *local,  int prefix,
 	      is_same_net6(local, &context->start6, prefix) &&
 	      is_same_net6(local, &context->end6, prefix))
 	    {
+
+
 	      /* link it onto the current chain if we've not seen it before */
 	      if (context->current == context)
 		{
-		  context->current = param->current;
+		  struct dhcp_context *tmp, **up;
-		  param->current = context;
+		  
+		  /* use interface values only for contructed contexts */
+		  if (!(context->flags & CONTEXT_CONSTRUCTED))
+		    preferred = valid = 0xffffffff;
+		  else if (flags & IFACE_DEPRECATED)
+		    preferred = 0;
+
+		  if (context->flags & CONTEXT_DEPRECATE)
+		    preferred = 0;
+		  
+		  /* order chain, longest preferred time first */
+		  for (up = &param->current, tmp = param->current; tmp; tmp = tmp->current)
+		    if (tmp->preferred <= preferred)
+		      break;
+		  
+		  context->current = *up;
+		  *up = context;
 		  context->local6 = *local;
+		  context->preferred = preferred;
+		  context->valid = valid;
 		}
 	    }
 	}
@@ -475,7 +492,7 @@ static int make_duid1(int index, unsigned int type, char *mac, size_t maclen, vo
 
 struct cparam {
   time_t now;
-  int newone;
+  int newone, newname;
 };
 
 static int construct_worker(struct in6_addr *local, int prefix, 
@@ -549,6 +566,10 @@ static int construct_worker(struct in6_addr *local, int prefix,
 	       lease_update_file to get periodic functions called */
 	    param->newone = 1; 
 
+	    /* Will need to add new putative SLAAC addresses to existing leases */
+	    if (context->flags & CONTEXT_RA_NAME)
+	      param->newname = 1;
+	    
 	    log_context(AF_INET6, context);
 	  } 
       }
@@ -561,13 +582,14 @@ void dhcp_construct_contexts(time_t now)
   struct dhcp_context *tmp, *context, **up;
   struct cparam param;
   param.newone = 0;
+  param.newname = 0;
   param.now = now;
 
   for (context = daemon->dhcp6; context; context = context->next)
-    if (context->flags & CONTEXT_CONSTRUCTED)
     {
-	context->flags |= CONTEXT_GC;
       context->if_index = 0;
+      if (context->flags & CONTEXT_CONSTRUCTED)
+      	context->flags |= CONTEXT_GC;
     }
  
   iface_enumerate(AF_INET6, &param, construct_worker);
@@ -578,10 +600,11 @@ void dhcp_construct_contexts(time_t now)
       
       if (context->flags & CONTEXT_GC)
 	{
-	  if (daemon->dhcp6 == context)
-	    daemon->dhcp6 = context->next;
 	  *up = context->next;
 	  free(context);
+	  param.newone = 1; /* include deletion */ 
+	  if (context->flags & CONTEXT_RA_NAME)
+	    param.newname = 1;
 	}
       else
 	up = &context->next;
@@ -590,7 +613,11 @@ void dhcp_construct_contexts(time_t now)
   if (param.newone)
     {
       if (daemon->dhcp || daemon->doing_dhcp6)
+	{
+	  if (param.newname)
+	    lease_update_slaac(now);
 	  lease_update_file(now);
+	}
       else 
 	/* Not doing DHCP, so no lease system, manage alarms for ra only */
 	send_alarm(periodic_ra(now), now);

src/dnsmasq.h

@@ -683,6 +683,7 @@ struct dhcp_context {
   struct in6_addr start6, end6; /* range of available addresses */
   struct in6_addr local6;
   int prefix, if_index;
+  unsigned int valid, preferred;
   time_t ra_time, ra_short_period_start;
   char *template_interface;
 #endif
@@ -1047,6 +1048,7 @@ void lease6_filter(int lease_type, int iaid, struct dhcp_context *context);
 struct dhcp_lease *lease6_find_by_addr(struct in6_addr *net, int prefix, u64 addr);
 u64 lease_find_max_addr6(struct dhcp_context *context);
 void lease_ping_reply(struct in6_addr *sender, unsigned char *packet, char *interface);
+void lease_update_slaac(time_t now);
 #endif
 void lease_set_hwaddr(struct dhcp_lease *lease, unsigned char *hwaddr,
 		      unsigned char *clid, int hw_len, int hw_type, int clid_len, time_t now, int force);

src/lease.c

@@ -389,6 +389,18 @@ void lease_ping_reply(struct in6_addr *sender, unsigned char *packet, char *inte
     slaac_ping_reply(sender, packet, interface, leases);
 }
 
+void lease_update_slaac(time_t now)
+{
+  /* Called when we contruct a new RA-names context, to add putative
+     new SLAAC addresses to existing leases. */
+
+  struct dhcp_lease *lease;
+  
+  if (daemon->dhcp)
+    for (lease = leases; lease; lease = lease->next)
+      slaac_add_addrs(lease, now, 0);
+}
+
 #endif
 
 

src/netlink.c

@@ -39,7 +39,7 @@ static struct iovec iov;
 static u32 netlink_pid;
 
 static int nl_async(struct nlmsghdr *h);
-static void nl_newinterface(time_t now);
+static void nl_newaddress(time_t now);
 
 void netlink_init(void)
 {
@@ -200,7 +200,7 @@ int iface_enumerate(int family, void *parm, int (*callback)())
 	    /* handle async new interface address arrivals, these have to be done
 	       after we complete as we're not re-entrant */
 	    if (newaddr) 
-	      nl_newinterface(dnsmasq_time());
+	      nl_newaddress(dnsmasq_time());
 		
 	    return callback_ok;
 	  }
@@ -342,7 +342,7 @@ void netlink_multicast(time_t now)
   fcntl(daemon->netlinkfd, F_SETFL, flags);
   
   if (newaddr) 
-    nl_newinterface(now);
+    nl_newaddress(now);
 }
 
 static int nl_async(struct nlmsghdr *h)
@@ -391,19 +391,19 @@ static int nl_async(struct nlmsghdr *h)
   return 0;
 }
   	
-static void nl_newinterface(time_t now)
+static void nl_newaddress(time_t now)
 {
-  if (option_bool(OPT_CLEVERBIND))
+  if (option_bool(OPT_CLEVERBIND) || daemon->doing_dhcp6 || daemon->doing_ra)
-    {
     enumerate_interfaces();
+  
+  if (option_bool(OPT_CLEVERBIND))
     create_bound_listeners(0);
-    }
   
 #ifdef HAVE_DHCP6
   if (daemon->doing_dhcp6 || daemon->doing_ra)
     {
-      dhcp_construct_contexts(now);
       join_multicast(0);
+      dhcp_construct_contexts(now);
     }
   
   if (daemon->doing_dhcp6)

src/network.c

@@ -596,7 +596,7 @@ void join_multicast(int dienow)
   struct irec *iface, *tmp;
 
   for (iface = daemon->interfaces; iface; iface = iface->next)
-    if (iface->dhcp_ok && !iface->multicast_done)
+    if (iface->addr.sa.sa_family == AF_INET6 && iface->dhcp_ok && !iface->multicast_done)
       {
 	/* There's an irec per address but we only want to join for multicast 
 	   once per interface. Weed out duplicates. */

src/option.c

@@ -2371,6 +2371,13 @@ static int one_opt(int option, char *arg, char *errstr, char *gen_err, int comma
 			a[leasepos][strlen(a[leasepos]) - 1] = 0;
 		      }
 		    
+		    for (cp = a[leasepos]; *cp; cp++)
+		      if (!(*cp >= '0' && *cp <= '9'))
+			break;
+
+		    if (!cp || (leasepos+1 < k))
+		      ret_err(_("bad dhcp-range"));
+		    
 		    new->lease_time = atoi(a[leasepos]) * fac;
 		    /* Leases of a minute or less confuse
 		       some clients, notably Apple's */

src/radv.c

@@ -193,6 +193,9 @@ static void send_ra(time_t now, int iface, char *iface_name, struct in6_addr *de
   struct dhcp_netid iface_id;
   struct dhcp_opt *opt_cfg;
   int done_dns = 0;
+#ifdef HAVE_LINUX_NETWORK
+  FILE *f;
+#endif
 
   save_counter(0);
   ra = expand(sizeof(struct ra_packet));
@@ -231,13 +234,22 @@ static void send_ra(time_t now, int iface, char *iface_name, struct in6_addr *de
 
   strncpy(ifr.ifr_name, iface_name, IF_NAMESIZE);
 
-  if (ioctl(daemon->icmp6fd, SIOCGIFMTU, &ifr) != -1)
+#ifdef HAVE_LINUX_NETWORK
+  /* Note that IPv6 MTU is not necessarilly the same as the IPv4 MTU
+     available from SIOCGIFMTU */
+  sprintf(daemon->namebuff, "/proc/sys/net/ipv6/conf/%s/mtu", iface_name);
+  if ((f = fopen(daemon->namebuff, "r")))
+    {
+      if (fgets(daemon->namebuff, MAXDNAME, f))
 	{
 	  put_opt6_char(ICMP6_OPT_MTU);
 	  put_opt6_char(1);
 	  put_opt6_short(0);
-      put_opt6_long(ifr.ifr_mtu);
+	  put_opt6_long(atoi(daemon->namebuff));
 	}
+      fclose(f);
+    }
+#endif
      
   iface_enumerate(AF_LOCAL, &iface, add_lla);
  
@@ -344,6 +356,7 @@ static int add_prefixes(struct in6_addr *local,  int prefix,
 	  int do_prefix = 0;
 	  int do_slaac = 0;
 	  int deprecate  = 0;
+	  int constructed = 0;
 	  unsigned int time = 0xffffffff;
 	  struct dhcp_context *context;
 	  
@@ -373,13 +386,21 @@ static int add_prefixes(struct in6_addr *local,  int prefix,
 		    param->other = 1;
 		  }
 		
-		/* find floor time */
+		/* find floor time, don't reduce below RA interval. */
 		if (time > context->lease_time)
+		  {
 		    time = context->lease_time;
+		    if (time < 600u)
+		      time = 600;
+		  }
 
 		if (context->flags & CONTEXT_DEPRECATE)
 		  deprecate = 1;
 		
+		if (context->flags & CONTEXT_CONSTRUCTED)
+		  constructed = 1;
+
+
 		/* collect dhcp-range tags */
 		if (context->netid.next == &context->netid && context->netid.net)
 		  {
@@ -404,17 +425,18 @@ static int add_prefixes(struct in6_addr *local,  int prefix,
 	      }
 
 	  /* configured time is ceiling */
-	  if (valid > time)
+	  if (!constructed || valid > time)
 	    valid = time;
 	  
-	  if ((flags & IFACE_DEPRECATED) || deprecate)
+	  if (flags & IFACE_DEPRECATED)
 	    preferred = 0;
-	  else 
+	  
-	    {
+	  if (deprecate)
+	    time = 0;
+	  
 	  /* configured time is ceiling */
-	      if (preferred > time)
+	  if (!constructed || preferred > time)
 	    preferred = time;
-	    }
 	    	  
 	  if (preferred > param->pref_time)
 	    {

src/rfc3315.c

@@ -626,7 +626,13 @@ static int dhcp6_no_relay(int msg_type, struct in6_addr *link_address, struct dh
 			      }
 			  }
 		       	
-			lease_time = have_config(valid_config, CONFIG_TIME) ? valid_config->lease_time : this_context->lease_time;
+			if (have_config(valid_config, CONFIG_TIME))
+			  lease_time = valid_config->lease_time;
+			else
+			  lease_time = this_context->lease_time;
+			
+			 if (this_context->valid < lease_time)
+			   lease_time = this_context->valid;
 			
 			 if (ia_option)
 			  {
@@ -740,7 +746,8 @@ static int dhcp6_no_relay(int msg_type, struct in6_addr *link_address, struct dh
 			    o1 =  new_opt6(OPTION6_IAADDR);
 			    put_opt6(addrp, sizeof(*addrp));
 			    /* preferred lifetime */
-			    put_opt6_long(this_context && (this_context->flags & CONTEXT_DEPRECATE) ? 0 : lease_time);
+			    put_opt6_long(this_context && (this_context->preferred < lease_time) ? 
+					  this_context->preferred : lease_time);
 			    put_opt6_long(lease_time); /* valid lifetime */
 			    end_opt6(o1);