Fix paretheses in ADD_RDLEN - it always returned 1 before.

Fixed call to sendto() in dhcp6.c. How did it every work before?

CHANGELOG

@@ -45,18 +45,36 @@ version 2.60
 	    round-robin	to multiple servers, in the same way as
 	    --dhcp-boot. A good suggestion from Cristiano Cumer.
 
-	    Support BUILDDIR variable in the Makefile. Allows 
-	    builds from multiple architectures in the same tree with eg
-	    make BUILDDIR=linux
+	    Support BUILDDIR variable in the Makefile. Allows builds 
+	    for multiple archs from the same source tree with eg.
+	    make BUILDDIR=linux             (relative to dnsmasq tree)
+	    make BUILDDIR=/tmp/openbsd      (absolute path)
 	    If BUILDDIR is not set, compilation happens in the src
 	    directory, as before. Suggestion from Mark Mitchell.
 
-	    First cut at supporting DHCPv6. Support is pretty much
-	    there for the sort of things the existing v4 server does,
-	    including tags, options, static addresses and relay
-	    support. Missing is prefix delegation. This is lightly
-	    tested alpha code, it is NOT YET PRODUCTION READY. Test
-	    reports would be greatly valued.
+	    Support DHCPv6. Support is there for the sort of things
+	    the existing v4 server does, including tags, options, 
+	    static addresses and relay support. Missing is prefix 
+	    delegation, which is probably not required in the dnsmasq
+	    niche, and an easy way to accept prefix delegations from
+	    an upstream DHCPv6 server, which is. Future plans include
+	    support for DHCPv6 router option and MAC address option
+	    (to make selecting clients by MAC address work like IPv4).
+	    These will be added as the standards mature.
+	    This code has been tested, but this is the first release,
+	    so don't bet the farm on it just yet. Many thanks to all 
+	    testers who have got it this far.
+
+	    Support IPv6 router advertisements. This is a
+	    simple-minded implementation, aimed at providing the
+	    vestigial RA needed to go alongside IPv6. Is picks up
+	    configuration from the DHCPv6 conf, and should just need
+	    enabling with --enable-ra.   
+
+	    Fix long-standing wrinkle with --localise-queries that
+	    could result in wrong answers when DNS packets arrive
+	    via an interface other than the expected one. Thanks to 
+	    Lorenzo Milesi and John Hanks for spotting this one.
 
 	    
 version 2.59

Makefile

@@ -13,50 +13,69 @@
 #  You should have received a copy of the GNU General Public License
 #  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-PREFIX = /usr/local
-BINDIR = ${PREFIX}/sbin
-MANDIR = ${PREFIX}/share/man
-LOCALEDIR = ${PREFIX}/share/locale
+# NOTE: Building the i18n targets requires GNU-make 
 
-BUILDDIR = $(SRC)
 
-CFLAGS = -Wall -W -O2
+# Variables you may well want to override.
+
+PREFIX        = /usr/local
+BINDIR        = $(PREFIX)/sbin
+MANDIR        = $(PREFIX)/share/man
+LOCALEDIR     = $(PREFIX)/share/locale
+BUILDDIR      = $(SRC)
+DESTDIR       = 
+CFLAGS        = -Wall -W -O2
+LDFLAGS       = 
+COPTS         = 
+RPM_OPT_FLAGS = 
+LIBS          = 
 
 #################################################################
 
+# Variables you might want to override.
+
 PKG_CONFIG = pkg-config
-INSTALL = install
-MSGMERGE = msgmerge
-MSGFMT = msgfmt
-XGETTEXT = xgettext
+INSTALL    = install
+MSGMERGE   = msgmerge
+MSGFMT     = msgfmt
+XGETTEXT   = xgettext
 
 SRC = src
-PO = po
+PO  = po
 MAN = man
 
-DBUS_CFLAGS=`echo $(COPTS) | ../bld/pkg-wrapper HAVE_DBUS $(PKG_CONFIG) --cflags dbus-1` 
-DBUS_LIBS=  `echo $(COPTS) | ../bld/pkg-wrapper HAVE_DBUS $(PKG_CONFIG) --libs dbus-1` 
-IDN_CFLAGS= `echo $(COPTS) | ../bld/pkg-wrapper HAVE_IDN $(PKG_CONFIG) --cflags libidn` 
-IDN_LIBS=   `echo $(COPTS) | ../bld/pkg-wrapper HAVE_IDN $(PKG_CONFIG) --libs libidn` 
-CT_CFLAGS=  `echo $(COPTS) | ../bld/pkg-wrapper HAVE_CONNTRACK $(PKG_CONFIG) --cflags libnetfilter_conntrack`
-CT_LIBS=    `echo $(COPTS) | ../bld/pkg-wrapper HAVE_CONNTRACK $(PKG_CONFIG) --libs libnetfilter_conntrack`
-LUA_CFLAGS= `echo $(COPTS) | ../bld/pkg-wrapper HAVE_LUASCRIPT $(PKG_CONFIG) --cflags lua5.1` 
-LUA_LIBS=   `echo $(COPTS) | ../bld/pkg-wrapper HAVE_LUASCRIPT $(PKG_CONFIG) --libs lua5.1` 
-SUNOS_LIBS= `if uname | grep SunOS 2>&1 >/dev/null; then echo -lsocket -lnsl -lposix4; fi`
-VERSION=    -DVERSION='\"`../bld/get-version`\"'
+#################################################################
 
-OBJS = cache.o rfc1035.o util.o option.o forward.o network.o \
+# pmake way. (NB no spaces to keep gmake 3.82 happy)
+top!=pwd
+# GNU make way.
+top?=$(CURDIR)
+
+dbus_cflags = `echo $(COPTS) | $(top)/bld/pkg-wrapper HAVE_DBUS $(PKG_CONFIG) --cflags dbus-1` 
+dbus_libs =   `echo $(COPTS) | $(top)/bld/pkg-wrapper HAVE_DBUS $(PKG_CONFIG) --libs dbus-1` 
+idn_cflags =  `echo $(COPTS) | $(top)/bld/pkg-wrapper HAVE_IDN $(PKG_CONFIG) --cflags libidn` 
+idn_libs =    `echo $(COPTS) | $(top)/bld/pkg-wrapper HAVE_IDN $(PKG_CONFIG) --libs libidn` 
+ct_cflags =   `echo $(COPTS) | $(top)/bld/pkg-wrapper HAVE_CONNTRACK $(PKG_CONFIG) --cflags libnetfilter_conntrack`
+ct_libs =     `echo $(COPTS) | $(top)/bld/pkg-wrapper HAVE_CONNTRACK $(PKG_CONFIG) --libs libnetfilter_conntrack`
+lua_cflags =  `echo $(COPTS) | $(top)/bld/pkg-wrapper HAVE_LUASCRIPT $(PKG_CONFIG) --cflags lua5.1` 
+lua_libs =    `echo $(COPTS) | $(top)/bld/pkg-wrapper HAVE_LUASCRIPT $(PKG_CONFIG) --libs lua5.1` 
+sunos_libs =  `if uname | grep SunOS >/dev/null 2>&1; then echo -lsocket -lnsl -lposix4; fi`
+version =     -DVERSION='\"`$(top)/bld/get-version $(top)`\"'
+
+objs = cache.o rfc1035.o util.o option.o forward.o network.o \
        dnsmasq.o dhcp.o lease.o rfc2131.o netlink.o dbus.o bpf.o \
-       helper.o tftp.o log.o conntrack.o dhcp6.o rfc3315.o dhcp-common.o 
-
-HDRS = dnsmasq.h config.h dhcp_protocol.h dhcp6_protocol.h dns_protocol.h
+       helper.o tftp.o log.o conntrack.o dhcp6.o rfc3315.o \
+       dhcp-common.o outpacket.o radv.o
 
+hdrs = dnsmasq.h config.h dhcp-protocol.h dhcp6-protocol.h \
+       dns-protocol.h radv-protocol.h
 
 all : $(BUILDDIR)
 	@cd $(BUILDDIR) && $(MAKE) \
- BUILD_CFLAGS="$(VERSION) $(DBUS_CFLAGS) $(IDN_CFLAGS) $(CT_CFLAGS) $(LUA_CFLAGS)" \
- BUILD_LIBS="$(DBUS_LIBS) $(IDN_LIBS) $(CT_LIBS) $(LUA_LIBS) $(SUNOS_LIBS)" \
- -f ../Makefile dnsmasq 
+ top="$(top)" \
+ build_cflags="$(version) $(dbus_cflags) $(idn_cflags) $(ct_cflags) $(lua_cflags)" \
+ build_libs="$(dbus_libs) $(idn_libs) $(ct_libs) $(lua_libs) $(sunos_libs)" \
+ -f $(top)/Makefile dnsmasq 
 
 clean :
 	rm -f *~ $(BUILDDIR)/*.mo contrib/*/*~ */*~ $(BUILDDIR)/*.pot 
@@ -71,45 +90,45 @@ install-common :
 
 all-i18n : $(BUILDDIR)
 	@cd $(BUILDDIR) && $(MAKE) \
- I18N=-DLOCALEDIR=\'\"$(LOCALEDIR)\"\' \
- BUILD_CFLAGS="$(VERSION) $(DBUS_CFLAGS) $(CT_CFLAGS) $(LUA_CFLAGS) `$(PKG_CONFIG) --cflags libidn`" \
- BUILD_LIBS="$(DBUS_LIBS) $(CT_LIBS) $(LUA_LIBS) $(SUNOS_LIBS) `$(PKG_CONFIG) --libs libidn`"  \
- -f ../Makefile dnsmasq
-	@cd $(PO); for f in *.po; do \
-		cd ../$(BUILDDIR) && $(MAKE) \
- -f ../Makefile $${f%.po}.mo; \
+ top="$(top)" \
+ i18n=-DLOCALEDIR=\'\"$(LOCALEDIR)\"\' \
+ build_cflags="$(version) $(dbus_cflags) $(ct_cflags) $(lua_cflags) `$(PKG_CONFIG) --cflags libidn`" \
+ build_libs="$(dbus_libs) $(ct_libs) $(lua_libs) $(sunos_libs) `$(PKG_CONFIG) --libs libidn`"  \
+ -f $(top)/Makefile dnsmasq
+	for f in `cd $(PO); echo *.po`; do \
+		cd $(top) && cd $(BUILDDIR) && $(MAKE) top="$(top)" -f $(top)/Makefile $${f%.po}.mo; \
 	done
 
 install-i18n : all-i18n install-common
-	cd $(BUILDDIR); ../bld/install-mo $(DESTDIR)$(LOCALEDIR) $(INSTALL)
+	cd $(BUILDDIR); $(top)/bld/install-mo $(DESTDIR)$(LOCALEDIR) $(INSTALL)
 	cd $(MAN); ../bld/install-man $(DESTDIR)$(MANDIR) $(INSTALL)
 
-merge : $(BUILDDIR)
-	@cd $(BUILDDIR) && $(MAKE) -f ../Makefile dnsmasq.pot
-	@cd $(PO); for f in *.po; do \
-		echo -n msgmerge $$f && $(MSGMERGE) --no-wrap -U $$f ../$(BUILDDIR)/dnsmasq.pot; \
+merge : 
+	@cd $(BUILDDIR) && $(MAKE) -f $(top)/Makefile dnsmasq.pot
+	for f in `cd $(PO); echo *.po`; do \
+		echo -n msgmerge $(PO)/$$f && $(MSGMERGE) --no-wrap -U $(PO)/$$f $(BUILDDIR)/dnsmasq.pot; \
 	done
 
 $(BUILDDIR):
-	mkdir $(BUILDDIR)
+	mkdir -p $(BUILDDIR)
 
 
 # rules below are targets in recusive makes with cwd=$(SRC)
 
-$(OBJS:.o=.c) $(HDRS):
-	ln -s ../$(SRC)/$@ .
+$(objs:.o=.c) $(hdrs):
+	ln -s $(top)/$(SRC)/$@ .
 
 .c.o:
-	$(CC) $(CFLAGS) $(COPTS) $(I18N) $(BUILD_CFLAGS) $(RPM_OPT_FLAGS) -c $<	
+	$(CC) $(CFLAGS) $(COPTS) $(i18n) $(build_cflags) $(RPM_OPT_FLAGS) -c $<	
 
-dnsmasq : $(HDRS) $(OBJS) 
-	$(CC) $(LDFLAGS) -o $@ $(OBJS) $(BUILD_LIBS) $(LIBS) 
+dnsmasq : $(hdrs) $(objs) 
+	$(CC) $(LDFLAGS) -o $@ $(objs) $(build_libs) $(LIBS) 
 
-dnsmasq.pot : $(OBJS:.o=.c) $(HDRS)
-	$(XGETTEXT) -d dnsmasq --foreign-user --omit-header --keyword=_ -o $@ -i $(OBJS:.o=.c)
+dnsmasq.pot : $(objs:.o=.c) $(hdrs)
+	$(XGETTEXT) -d dnsmasq --foreign-user --omit-header --keyword=_ -o $@ -i $(objs:.o=.c)
 
-%.mo : ../po/%.po dnsmasq.pot
-	$(MSGMERGE) -o - ../po/$*.po dnsmasq.pot | $(MSGFMT) -o $*.mo -
+%.mo : $(top)/$(PO)/%.po dnsmasq.pot
+	$(MSGMERGE) -o - $(top)/$(PO)/$*.po dnsmasq.pot | $(MSGFMT) -o $*.mo -
 
 
 .PHONY : all clean install install-common all-i18n install-i18n merge 

bld/Android.mk

@@ -7,7 +7,8 @@ LOCAL_SRC_FILES :=  bpf.c cache.c dbus.c dhcp.c dnsmasq.c \
                     forward.c helper.c lease.c log.c \
                     netlink.c network.c option.c rfc1035.c \
 		    rfc2131.c tftp.c util.c conntrack.c \
-		    dhcp6.c rfc3315.c dhcp-common.c 
+		    dhcp6.c rfc3315.c dhcp-common.c outpacket.c \
+		    radv.c
 
 LOCAL_MODULE := dnsmasq
 

bld/get-version

@@ -9,21 +9,18 @@
 # If we can find one which matches $v[0-9].* then we assume it's
 # a version-number tag, else we just use the whole string.
 
-# we're called with pwd == TLD
-cd ..
-
-if which git >/dev/null 2>&1 && [ -d .git ]; then
-     git describe
-elif grep '\$Format:%d\$' VERSION >/dev/null 2>&1; then
+if which git >/dev/null 2>&1 && [ -d $1/.git ]; then
+     cd $1; git describe
+elif grep '\$Format:%d\$' $1/VERSION >/dev/null 2>&1; then
 # unsubstituted VERSION, but no git available.
     echo UNKNOWN
 else
-     vers=`cat VERSION | sed 's/[(), ]/\n/ g' | grep -m 1 $v[0-9]`
+     vers=`cat $1/VERSION | sed 's/[(), ]/,/ g' | tr ',' '\n' | grep $v[0-9]`
 
      if [ $? -eq 0 ]; then
-         echo ${vers#v}
+         echo "${vers}" | head -n 1 | tail -c +2
      else
-         cat VERSION
+         cat $1/VERSION
      fi
 fi
 

bld/install-man

@@ -4,6 +4,6 @@ for f in *; do
   if [ -d $f ]; then
      $2 -m 755 -d $1/$f/man8 
      $2 -m 644 $f/dnsmasq.8 $1/$f/man8
-     echo installing $1/$f/man8/dnsmasq.8
+     echo installing $f/man8/dnsmasq.8
   fi
 done

bld/install-mo

@@ -3,7 +3,7 @@
 for f in *.mo; do
   $2 -m 755 -d $1/${f%.mo}/LC_MESSAGES
   $2 -m 644 $f $1/${f%.mo}/LC_MESSAGES/dnsmasq.mo
-  echo installing $1/${f%.mo}/LC_MESSAGES/dnsmasq.mo
+  echo installing ${f%.mo}/LC_MESSAGES/dnsmasq.mo
 done
 
 

debian/rules

@@ -33,8 +33,8 @@ ifeq ($(DEB_BUILD_ARCH_OS),linux)
 endif
 endif
 
-ifeq (,$(filter nodhcp6,$(DEB_BUILD_OPTIONS)))
-     COPTS += -DHAVE_DHCP6
+ifneq (,$(filter nodhcp6,$(DEB_BUILD_OPTIONS)))
+     COPTS += -DNO_DHCP6
 endif
 
 ifneq (,$(filter noipv6,$(DEB_BUILD_OPTIONS)))

dnsmasq.conf.example

@@ -157,6 +157,17 @@
 # an explicit netmask instead.
 #dhcp-range=192.168.0.0,static
 
+# Enable DHCPv6. Note that the prefix-length does not need to be specified
+# and defaults to 64 if missing/
+#dhcp-range=1234::2, 1234::500, 64, 12h
+
+# Do Router Advertisements, BUT NOT DHCP for this subnet.
+#dhcp-range=1234::, ra-only 
+
+# Do Router Advertisements, BUT NOT DHCP for this subnet.
+# Set the lifetime to 46 hours. (Note: minimum lifetime is 2 hours.)
+#dhcp-range=1234::, ra-only, 48h
+
 # Supply parameters for specified hosts using DHCP. There are lots
 # of valid alternatives, so we will give examples of each. Note that
 # IP addresses DO NOT have to be in the range given above, they just
@@ -219,6 +230,12 @@
 # any machine with Ethernet address starting 11:22:33:
 #dhcp-host=11:22:33:*:*:*,set:red
 
+# Give a fixed IPv6 address and name to client with 
+# DUID 00:01:00:01:16:d2:83:fc:92:d4:19:e2:d8:b2
+# Note the MAC addresses CANNOT be used to identify DHCPv6 clients.
+# Note also the they [] around the IPv6 address are obilgatory.
+#dhcp-host=id:00:01:00:01:16:d2:83:fc:92:d4:19:e2:d8:b2, fred, [1234::5] 
+
 # Ignore any clients which are not specified in dhcp-host lines
 # or /etc/ethers. Equivalent to ISC "deny unknown-clients".
 # This relies on the special "known" tag which is set when
@@ -270,6 +287,13 @@
 # Set the NTP time server addresses to 192.168.0.4 and 10.10.0.5
 #dhcp-option=option:ntp-server,192.168.0.4,10.10.0.5
 
+# Send DHCPv6 option. Note [] around IPv6 addresses.
+#dhcp-option=option6:dns-server,[1234::77],[1234::88]
+
+# Send DHCPv6 option for namservers as the machine running 
+# dnsmasq and another.
+#dhcp-option=option6:dns-server,[::],[1234::88]
+
 # Set the NTP time server address to be the same machine as
 # is running dnsmasq
 #dhcp-option=42,0.0.0.0

man/dnsmasq.8

@@ -529,14 +529,18 @@ The optional
 sets an alphanumeric label which marks this network so that
 dhcp options may be specified on a per-network basis. 
 When it is prefixed with 'tag:' instead, then its meaning changes from setting
-a tag to matching it. Only one tag may be set, but more than one tag may be matched.
+a tag to matching it. Only one tag may be set, but more than one tag
+may be matched.
+
 The end address may be replaced by the keyword 
 .B static
 which tells dnsmasq to enable DHCP for the network specified, but not
 to dynamically allocate IP addresses: only hosts which have static
 addresses given via 
 .B dhcp-host
-or from /etc/ethers will be served. The end address may be replaced by
+or from /etc/ethers will be served. 
+
+The end address may be replaced by
 the keyword
 .B proxy
 in which case dnsmasq will provide proxy-DHCP on the specified
@@ -546,6 +550,14 @@ and
 .B pxe-service
 for details, applies to IPv4 only.)
 
+The end address may be replaced by
+the keyword
+.B ra-only
+which tells dnsmasq to offer Router Advertisement only on this subnet,
+and not DHCP. This applies to IPv6 only, see
+.B enable-ra
+for details.
+
 The interface:<interface name> section is not normally used. See the
 NOTES section for details of this.
 .TP
@@ -692,7 +704,7 @@ and to set the time-server address to 192.168.0.4, do
 .B --dhcp-option = 42,192.168.0.4 
 or 
 .B --dhcp-option = option:ntp-server, 192.168.0.4
-The special address 0.0.0.0 is taken to mean "the address of the
+The special address 0.0.0.0 (or [::] for DHCPv6) is taken to mean "the address of the
 machine running dnsmasq". Data types allowed are comma separated
 dotted-quad IP addresses, a decimal number, colon-separated hex digits
 and a text string. If the optional tags are given then
@@ -1234,6 +1246,26 @@ added into dnsmasq's DNS view. This flag suppresses that behaviour,
 this is useful, for instance, to allow Windows clients to update
 Active Directory servers. See RFC 4702 for details. 
 .TP
+.B --enable-ra
+Enable dnsmasq's IPv6 Router Advertisement feature. DHCPv6 doesn't
+handle complete network configuration in the same way as DHCPv4. Router
+discovery and (possibly) prefix discovery for autonomous address
+creation are handled by a different protocol. When DHCP is in use,
+only a subset of this is needed, and dnsmasq can handle it, using
+existing DHCP configuration to provide most data. When RA is enabled,
+dnsmasq will advertise a prefix for each dhcp-range, with default
+router and recursive DNS server as the relevant link-local address on 
+the machine running dnsmasq. The "managed address" bits are set,
+except for a dhcp-range which is marked as "ra-only", in which case RA
+is provided by no DHCPv6 service and the managed address bits are
+cleared. 
+.B enable-ra
+enables router advertisement for prefixes where dnsmasq is doing
+DHCPv6. It is not needed to "ra-only" prefixes. Creating an "ra-only"
+prefix and not setting 
+.B enable-ra
+sends advertisements only to "ra-only" prefixes. 
+.TP
 .B --enable-tftp[=<interface>]
 Enable the TFTP server function. This is deliberately limited to that
 needed to net-boot a client. Only reading is allowed; the tsize and

src/bpf.c

@@ -199,7 +199,8 @@ int iface_enumerate(int family, void *parm, int (*callback)())
 	    { 
 	      /* Assume ethernet again here */
 	      struct sockaddr_dl *sdl = (struct sockaddr_dl *)&ifr->ifr_addr;
-	      if (sdl->sdl_alen != 0 && !((*callback)(ARPHRD_ETHER, LLADDR(sdl), sdl->sdl_alen, parm)))
+	      if (sdl->sdl_alen != 0 && !((*callback)((int)if_nametoindex(ifr->ifr_name),
+						      ARPHRD_ETHER, LLADDR(sdl), sdl->sdl_alen, parm)))
 		goto err;
 	    }
 #endif 

src/dhcp-common.c

@@ -53,14 +53,14 @@ ssize_t recv_dhcp_packet(int fd, struct msghdr *msg)
 
       /* Very new Linux kernels return the actual size needed, 
 	 older ones always return truncated size */
-      if ((size_t)sz == daemon->dhcp_packet.iov_len)
+      if ((size_t)sz == msg->msg_iov->iov_len)
 	{
-	  if (!expand_buf(&daemon->dhcp_packet, sz + 100))
+	  if (!expand_buf(msg->msg_iov, sz + 100))
 	    return -1;
 	}
       else
 	{
-	  expand_buf(&daemon->dhcp_packet, sz);
+	  expand_buf(msg->msg_iov, sz);
 	  break;
 	}
     }
@@ -332,9 +332,9 @@ void dhcp_update_configs(struct dhcp_config *configs)
 	      }
 
 #ifdef HAVE_DHCP6
-	    if (prot == AF_INET6 && !config_find_by_address6(configs, &crec->addr.addr.addr.addr6, 129, 0))
+	    if (prot == AF_INET6 && !config_find_by_address6(configs, &crec->addr.addr.addr.addr6, 128, 0))
 	      {
-		memcpy(config->hwaddr, &crec->addr.addr.addr.addr6, IN6ADDRSZ);
+		memcpy(&config->addr6, &crec->addr.addr.addr.addr6, IN6ADDRSZ);
 		config->flags |= CONFIG_ADDR6 | CONFIG_ADDR_HOSTS;
 		continue;
 	      }
@@ -358,4 +358,90 @@ void dhcp_update_configs(struct dhcp_config *configs)
 
 }
 
+#ifdef HAVE_DHCP6
+static int join_multicast_worker(struct in6_addr *local, int prefix, 
+				 int scope, int if_index, int dad, void *vparam)
+{
+  char ifrn_name[IFNAMSIZ];
+  struct ipv6_mreq mreq;
+  int fd, i, max = *((int *)vparam);
+  struct dhcp_context *context;
+  struct iname *tmp;
+
+  (void)prefix;
+  (void)scope;
+  (void)dad;
+  
+  /* record which interfaces we join on, so that we do it at most one per 
+     interface, even when they have multiple addresses. Use outpacket
+     as an array of int, since it's always allocated here and easy
+     to expand for theoretical vast numbers of interfaces. */
+  for (i = 0; i < max; i++)
+    if (if_index == ((int *)daemon->outpacket.iov_base)[i])
+      return 1;
+  
+  if ((fd = socket(PF_INET6, SOCK_DGRAM, 0)) == -1)
+    return 0;
+  
+  if (!indextoname(fd, if_index, ifrn_name))
+    {
+      close(fd);
+      return 0;
+    }
+  
+  close(fd);
+
+  /* Are we doing DHCP on this interface? */
+  if (!iface_check(AF_INET6, (struct all_addr *)local, ifrn_name))
+    return 1;
+ 
+  for (tmp = daemon->dhcp_except; tmp; tmp = tmp->next)
+    if (tmp->name && (strcmp(tmp->name, ifrn_name) == 0))
+      return 1;
+
+  /* weird libvirt-inspired access control */
+  for (context = daemon->dhcp6; context; context = context->next)
+    if (!context->interface || strcmp(context->interface, ifrn_name) == 0)
+      break;
+
+  if (!context)
+    return 1;
+  
+  mreq.ipv6mr_interface = if_index;
+  
+  inet_pton(AF_INET6, ALL_RELAY_AGENTS_AND_SERVERS, &mreq.ipv6mr_multiaddr);
+  
+  if (daemon->dhcp6 &&
+      setsockopt(daemon->dhcp6fd, IPPROTO_IPV6, IPV6_JOIN_GROUP, &mreq, sizeof(mreq)) == -1)
+    return 0;
+
+  inet_pton(AF_INET6, ALL_SERVERS, &mreq.ipv6mr_multiaddr);
+  
+  if (daemon->dhcp6 && 
+      setsockopt(daemon->dhcp6fd, IPPROTO_IPV6, IPV6_JOIN_GROUP, &mreq, sizeof(mreq)) == -1)
+    return 0;
+  
+  inet_pton(AF_INET6, ALL_ROUTERS, &mreq.ipv6mr_multiaddr);
+  
+  if (daemon->ra_contexts &&
+      setsockopt(daemon->icmp6fd, IPPROTO_IPV6, IPV6_JOIN_GROUP, &mreq, sizeof(mreq)) == -1)
+    return 0;
+  
+  expand_buf(&daemon->outpacket, (max+1) * sizeof(int));
+  ((int *)daemon->outpacket.iov_base)[max++] = if_index;
+  
+  *((int *)vparam) = max;
+  
+  return 1;
+}
+
+void join_multicast(void)
+{
+  int count = 0;
+
+   if (!iface_enumerate(AF_INET6, &count, join_multicast_worker))
+     die(_("failed to join DHCPv6 multicast group: %s"), NULL, EC_BADNET);
+}
+#endif
+
 #endif

src/dhcp6.c

@@ -20,27 +20,19 @@
 
 struct iface_param {
   struct dhcp_context *current;
+  struct in6_addr fallback;
   int ind;
 };
 
-struct listen_param {
-  int fd_or_iface;
-  struct listen_param *next;
-};
-
-static int join_multicast(struct in6_addr *local, int prefix, 
-			  int scope, int if_index, int dad, void *vparam);
-
 static int complete_context6(struct in6_addr *local,  int prefix,
 			     int scope, int if_index, int dad, void *vparam);
 
-static int make_duid1(unsigned int type, char *mac, size_t maclen, void *parm); 
+static int make_duid1(int index, unsigned int type, char *mac, size_t maclen, void *parm); 
 
 void dhcp6_init(void)
 {
   int fd;
   struct sockaddr_in6 saddr;
-  struct listen_param *listenp, listen; 
 #if defined(IP_TOS) && defined(IPTOS_CLASS_CS6)
   int class = IPTOS_CLASS_CS6;
 #endif
@@ -64,81 +56,9 @@ void dhcp6_init(void)
   if (bind(fd, (struct sockaddr *)&saddr, sizeof(struct sockaddr_in6)))
     die(_("failed to bind DHCPv6 server socket: %s"), NULL, EC_BADNET);
   
-  /* join multicast groups on each interface we're interested in */
-  listen.fd_or_iface = fd;
-  listen.next = NULL;
-  if (!iface_enumerate(AF_INET6, &listen, join_multicast))
-     die(_("failed to join DHCPv6 multicast group: %s"), NULL, EC_BADNET);
-  for (listenp = listen.next; listenp; )
-    {
-      struct listen_param *tmp = listenp->next;
-      free(listenp);
-      listenp = tmp;
-    }
-  
   daemon->dhcp6fd = fd;
 }
 
-static int join_multicast(struct in6_addr *local, int prefix, 
-			  int scope, int if_index, int dad, void *vparam)
-{
-  char ifrn_name[IFNAMSIZ];
-  struct ipv6_mreq mreq;
-  struct listen_param *listenp, *param = vparam;
-  int fd = param->fd_or_iface;
-  struct dhcp_context *context;
-  struct iname *tmp;
-
-  (void)prefix;
-  (void)scope;
-  (void)dad;
-  
-  /* record which interfaces we join on, so
-     that we do it at most one per interface, even when they
-     have multiple addresses */
-  for (listenp = param->next; listenp; listenp = listenp->next)
-    if (if_index == listenp->fd_or_iface)
-      return 1;
-  
-  if (!indextoname(fd, if_index, ifrn_name))
-    return 0;
-
-  /* Are we doing DHCP on this interface? */
-  if (!iface_check(AF_INET6, (struct all_addr *)local, ifrn_name))
-    return 1;
- 
-  for (tmp = daemon->dhcp_except; tmp; tmp = tmp->next)
-    if (tmp->name && (strcmp(tmp->name, ifrn_name) == 0))
-      return 1;
-
-  /* weird libvirt-inspired access control */
-  for (context = daemon->dhcp6; context; context = context->next)
-    if (!context->interface || strcmp(context->interface, ifrn_name) == 0)
-      break;
-
-  if (!context)
-    return 1;
-
-  mreq.ipv6mr_interface = if_index;
-  inet_pton(AF_INET6, ALL_RELAY_AGENTS_AND_SERVERS, &mreq.ipv6mr_multiaddr);
-  
-  if (setsockopt(fd, IPPROTO_IPV6, IPV6_JOIN_GROUP, &mreq, sizeof(mreq)) == -1)
-    return 0;
-
-  inet_pton(AF_INET6, ALL_SERVERS, &mreq.ipv6mr_multiaddr);
-  
-  if (setsockopt(fd, IPPROTO_IPV6, IPV6_JOIN_GROUP, &mreq, sizeof(mreq)) == -1)
-    return 0;
-  
-  listenp = whine_malloc(sizeof(struct listen_param));
-  listenp->fd_or_iface = if_index;
-  listenp->next = param->next;
-  param->next = listenp;
-  
-  return 1;
-}
-
-
 void dhcp6_packet(time_t now)
 {
   struct dhcp_context *context;
@@ -150,7 +70,7 @@ void dhcp6_packet(time_t now)
     struct cmsghdr align; /* this ensures alignment */
     char control6[CMSG_SPACE(sizeof(struct in6_pktinfo))];
   } control_u;
-  union mysockaddr from;
+  struct sockaddr_in6 from;
   struct all_addr dest;
   ssize_t sz; 
   struct ifreq ifr;
@@ -200,24 +120,28 @@ void dhcp6_packet(time_t now)
 
   /* unlinked contexts are marked by context->current == context */
   for (context = daemon->dhcp6; context; context = context->next)
-    context->current = context;
-  
+    {
+      context->current = context;
+      memset(&context->local6, 0, IN6ADDRSZ);
+    }
+
   parm.current = NULL;
   parm.ind = if_index;
+  memset(&parm.fallback, 0, IN6ADDRSZ);
   
   if (!iface_enumerate(AF_INET6, &parm, complete_context6))
     return;
   
   lease_prune(NULL, now); /* lose any expired leases */
 
-  msg.msg_iov =  &daemon->dhcp_packet;
-  sz = dhcp6_reply(parm.current, if_index, ifr.ifr_name, sz, IN6_IS_ADDR_MULTICAST(&from.in6.sin6_addr), now);
+  sz = dhcp6_reply(parm.current, if_index, ifr.ifr_name, &parm.fallback, 
+		   sz, IN6_IS_ADDR_MULTICAST(&from.sin6_addr), now);
   
   lease_update_file(now);
   lease_update_dns();
   
   if (sz != 0)
-    while (sendto(daemon->dhcp6fd, daemon->outpacket.iov_base, sz, 0, (struct sockaddr *)&from, sizeof(from)) &&
+    while (sendto(daemon->dhcp6fd, daemon->outpacket.iov_base, sz, 0, (struct sockaddr *)&from, sizeof(from)) == -1 &&
 	   retry_send());
 }
 
@@ -229,23 +153,32 @@ static int complete_context6(struct in6_addr *local,  int prefix,
 
   (void)scope; /* warning */
   (void)dad;
-
-  for (context = daemon->dhcp6; context; context = context->next)
+  
+  if (if_index == param->ind &&
+      !IN6_IS_ADDR_LOOPBACK(local) &&
+      !IN6_IS_ADDR_LINKLOCAL(local) &&
+      !IN6_IS_ADDR_MULTICAST(local))
     {
-      if (prefix == context->prefix &&
-	  !IN6_IS_ADDR_LOOPBACK(local) &&
-	  !IN6_IS_ADDR_LINKLOCAL(local) &&
-	  !IN6_IS_ADDR_MULTICAST(local) &&
-	  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 (if_index == param->ind && context->current == context)
-            {
-              context->current = param->current;
-              param->current = context;
-	      context->local6 = *local;
-            }
+      /* Determine a globally address on the arrival interface, even
+	 if we have no matching dhcp-context, because we're only
+	 allocating on remote subnets via relays. This
+	 is used as a default for the DNS server option. */
+      param->fallback = *local;
+      
+      for (context = daemon->dhcp6; context; context = context->next)
+	{
+	  if (prefix == context->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;
+		  param->current = context;
+		  context->local6 = *local;
+		}
+	    }
 	}
     }          
   return 1;
@@ -305,7 +238,7 @@ int address6_allocate(struct dhcp_context *context,  unsigned char *clid, int cl
 	  do {
 	    /* eliminate addresses in use by the server. */
 	    for (d = context; d; d = d->current)
-	      if (addr == addr6part(&d->router6))
+	      if (addr == addr6part(&d->local6))
 		break;
 
 	    if (!d &&
@@ -441,25 +374,29 @@ void make_duid(time_t now)
     die("Cannot create DHCPv6 server DUID: %s", NULL, EC_MISC);
 }
 
-static int make_duid1(unsigned int type, char *mac, size_t maclen, void *parm)
+static int make_duid1(int index, unsigned int type, char *mac, size_t maclen, void *parm)
 {
   /* create DUID as specified in RFC3315. We use the MAC of the
-     first interface we find that isn't loopback or P-to-P */
+     first interface we find that isn't loopback or P-to-P and
+     has address-type < 256. Address types above 256 are things like 
+     tunnels which don't have usable MAC addresses. */
   
   unsigned char *p;
+  (void)index;
 
+  if (type >= 256)
+    return 1;
+
+#ifdef HAVE_BROKEN_RTC
+  daemon->duid = p = safe_malloc(maclen + 4);
+  daemon->duid_len = maclen + 4;
+  PUTSHORT(3, p); /* DUID_LL */
+  PUTSHORT(type, p); /* address type */
+#else
   daemon->duid = p = safe_malloc(maclen + 8);
   daemon->duid_len = maclen + 8;
-  
-#ifdef HAVE_BROKEN_RTC
-  PUTSHORT(3, p); /* DUID_LL */
-#else
   PUTSHORT(1, p); /* DUID_LLT */
-#endif
-
   PUTSHORT(type, p); /* address type */
-
-#ifndef HAVE_BROKEN_RTC
   PUTLONG(*((time_t *)parm), p); /* time */
 #endif
 

src/dnsmasq.c

@@ -154,18 +154,41 @@ int main (int argc, char **argv)
 	 before lease_init to allocate buffers it uses.*/
       dhcp_common_init();
       lease_init(now);
+  
       if (daemon->dhcp)
 	dhcp_init();
-#ifdef HAVE_DHCP6
-      if (daemon->dhcp6)
-	dhcp6_init();
-#endif
     }
+  
+#  ifdef HAVE_DHCP6
+  /* Start RA subsystem if --enable-ra OR dhcp-range=<subnet>, ra-only */
+  if (daemon->ra_contexts || option_bool(OPT_RA))
+    {
+      /* link the DHCP6 contexts to the ra-only ones so we can traverse them all 
+	 from ->ra_contexts, but only the non-ra-onlies from ->dhcp6 */
+      struct dhcp_context *context;
+      
+      if (!daemon->ra_contexts)
+	daemon->ra_contexts = daemon->dhcp6;
+      else
+	{
+	  for (context = daemon->ra_contexts; context->next; context = context->next);
+	  context->next = daemon->dhcp6;
+	}
+      ra_init(now);
+    }
+
+  if (daemon->dhcp6)
+    dhcp6_init();
+
+  if (daemon->ra_contexts || daemon->dhcp6)
+    join_multicast();
+#  endif
+
 #endif
 
   if (!enumerate_interfaces())
     die(_("failed to find list of interfaces: %s"), NULL, EC_MISC);
-    
+  
   if (option_bool(OPT_NOWILD)) 
     {
       create_bound_listeners(1);
@@ -205,7 +228,8 @@ int main (int argc, char **argv)
 
 #if defined(HAVE_SCRIPT)
   /* Note getpwnam returns static storage */
-  if ((daemon->dhcp || daemon->dhcp6) && daemon->scriptuser && 
+  if ((daemon->dhcp || daemon->dhcp6) && 
+      daemon->scriptuser && 
       (daemon->lease_change_command || daemon->luascript))
     {
       if ((ent_pw = getpwnam(daemon->scriptuser)))
@@ -495,6 +519,9 @@ int main (int argc, char **argv)
 
   if (daemon->max_logs != 0)
     my_syslog(LOG_INFO, _("asynchronous logging enabled, queue limit is %d messages"), daemon->max_logs);
+ 
+  if (daemon->ra_contexts)
+    my_syslog(MS_DHCP | LOG_INFO, _("IPv6 router advertisement enabled"));
 
 #ifdef HAVE_DHCP
   if (daemon->dhcp || daemon->dhcp6)
@@ -525,6 +552,8 @@ int main (int argc, char **argv)
 	  my_syslog(MS_DHCP | LOG_INFO, 
 		    (dhcp_tmp->flags & CONTEXT_STATIC) ? 
 		    _("DHCP, static leases only on %.0s%s, lease time %s") :
+		    (dhcp_tmp->flags & CONTEXT_RA_ONLY) ? 
+		    _("router advertisement only on %.0s%s, lifetime %s") :
 		    (dhcp_tmp->flags & CONTEXT_PROXY) ?
 		    _("DHCP, proxy on subnet %.0s%s%.0s") :
 		    _("DHCP, IP range %s -- %s, lease time %s"),
@@ -535,7 +564,10 @@ int main (int argc, char **argv)
       if (family == AF_INET)
 	{
 	  family = AF_INET6;
-	  dhcp_tmp = daemon->dhcp6;
+	  if (daemon->ra_contexts)
+	    dhcp_tmp = daemon->ra_contexts;
+	  else
+	    dhcp_tmp = daemon->dhcp6;
 	  goto again;
 	}
 #endif
@@ -652,7 +684,13 @@ int main (int argc, char **argv)
       if (daemon->dhcp6)
 	{
 	  FD_SET(daemon->dhcp6fd, &rset);
-	   bump_maxfd(daemon->dhcp6fd, &maxfd);
+	  bump_maxfd(daemon->dhcp6fd, &maxfd);
+	  
+	  if (daemon->ra_contexts)
+	    {
+	      FD_SET(daemon->icmp6fd, &rset);
+	      bump_maxfd(daemon->icmp6fd, &maxfd); 
+	    }
 	}
 #endif
 
@@ -756,6 +794,9 @@ int main (int argc, char **argv)
 	{
 	  if (FD_ISSET(daemon->dhcp6fd, &rset))
 	    dhcp6_packet(now);
+
+	  if (daemon->ra_contexts && FD_ISSET(daemon->icmp6fd, &rset))
+	    icmp6_packet();
 	}
 #endif
 
@@ -808,6 +849,11 @@ static void sig_handler(int sig)
     }
 }
 
+void send_alarm(void)
+{
+  send_event(pipewrite, EVENT_ALARM, 0, NULL);
+}
+
 void send_event(int fd, int event, int data, char *msg)
 {
   struct event_desc ev;
@@ -925,6 +971,16 @@ static void async_event(int pipe, time_t now)
 	    lease_prune(NULL, now);
 	    lease_update_file(now);
 	  }
+#ifdef HAVE_DHCP6
+	else if (daemon->ra_contexts)
+	  {
+	    /* Not doing DHCP, so no lease system, manage 
+	       alarms for ra only */
+	    time_t next_event = periodic_ra(now);
+	    if (next_event != 0)
+	      alarm((unsigned)difftime(next_event, now)); 
+	  }
+#endif
 #endif
 	break;
 		
@@ -1089,6 +1145,16 @@ void clear_cache_and_reload(time_t now)
       lease_update_file(now); 
       lease_update_dns();
     }
+#ifdef HAVE_DHCP6
+  else if (daemon->ra_contexts)
+    {
+      /* Not doing DHCP, so no lease system, manage 
+	 alarms for ra only */
+      time_t next_event = periodic_ra(now);
+      if (next_event != 0)
+	alarm((unsigned)difftime(next_event, now)); 
+    }
+#endif
 #endif
 }
 
@@ -1372,7 +1438,15 @@ int icmp_ping(struct in_addr addr)
       FD_SET(fd, &rset);
       set_dns_listeners(now, &rset, &maxfd);
       set_log_writer(&wset, &maxfd);
-
+      
+#ifdef HAVE_DHCP6
+      if (daemon->ra_contexts)
+	{
+	  FD_SET(daemon->icmp6fd, &rset);
+	  bump_maxfd(daemon->icmp6fd, &maxfd); 
+	}
+#endif
+      
       if (select(maxfd+1, &rset, &wset, NULL, &tv) < 0)
 	{
 	  FD_ZERO(&rset);
@@ -1384,6 +1458,11 @@ int icmp_ping(struct in_addr addr)
       check_log_writer(&wset);
       check_dns_listeners(&rset, now);
 
+#ifdef HAVE_DHCP6
+      if (daemon->ra_contexts && FD_ISSET(daemon->icmp6fd, &rset))
+	icmp6_packet();
+#endif
+      
 #ifdef HAVE_TFTP
       check_tftp_listeners(&rset, now);
 #endif

src/dnsmasq.h

@@ -56,10 +56,11 @@ typedef unsigned short u16;
 typedef unsigned int u32;
 typedef unsigned long long u64;
 
-#include "dns_protocol.h"
-#include "dhcp_protocol.h"
+#include "dns-protocol.h"
+#include "dhcp-protocol.h"
 #ifdef HAVE_DHCP6
-#include "dhcp6_protocol.h"
+#include "dhcp6-protocol.h"
+#include "radv-protocol.h"
 #endif
 
 #define gettext_noop(S) (S)
@@ -215,7 +216,8 @@ struct event_desc {
 #define OPT_CONSEC_ADDR    34
 #define OPT_CONNTRACK      35
 #define OPT_FQDN_UPDATE    36
-#define OPT_LAST           37
+#define OPT_RA             37
+#define OPT_LAST           38
 
 /* extra flags for my_syslog, we use a couple of facilities since they are known 
    not to occupy the same bits as priorities, no matter how syslog.h is set up. */
@@ -603,8 +605,9 @@ struct dhcp_context {
   struct in_addr start, end; /* range of available addresses */
 #ifdef HAVE_DHCP6
   struct in6_addr start6, end6; /* range of available addresses */
-  struct in6_addr local6, router6;
+  struct in6_addr local6;
   int prefix;
+  time_t ra_time;
 #endif
   int flags;
   char *interface;
@@ -616,6 +619,8 @@ struct dhcp_context {
 #define CONTEXT_NETMASK   2
 #define CONTEXT_BRDCAST   4
 #define CONTEXT_PROXY     8
+#define CONTEXT_RA_ONLY  16
+#define CONTEXT_RA_DONE  32
 
 struct ping_result {
   struct in_addr addr;
@@ -694,7 +699,7 @@ extern struct daemon {
   int port, query_port, min_port;
   unsigned long local_ttl, neg_ttl, max_ttl;
   struct hostsfile *addn_hosts;
-  struct dhcp_context *dhcp, *dhcp6;
+  struct dhcp_context *dhcp, *dhcp6, *ra_contexts;
   struct dhcp_config *dhcp_conf;
   struct dhcp_opt *dhcp_opts, *dhcp_match, *dhcp_opts6, *dhcp_match6;
   struct dhcp_vendor *dhcp_vendors;
@@ -754,7 +759,7 @@ extern struct daemon {
   int duid_len;
   unsigned char *duid;
   struct iovec outpacket;
-  int dhcp6fd;
+  int dhcp6fd, icmp6fd;
 #endif
   /* DBus stuff */
   /* void * here to avoid depending on dbus headers outside dbus.c */
@@ -962,6 +967,7 @@ unsigned char *extended_hwaddr(int hwtype, int hwlen, unsigned char *hwaddr,
 int make_icmp_sock(void);
 int icmp_ping(struct in_addr addr);
 #endif
+void send_alarm(void);
 void send_event(int fd, int event, int data, char *msg);
 void clear_cache_and_reload(time_t now);
 void poll_resolv(int force, int do_reload, time_t now);
@@ -1036,7 +1042,8 @@ void make_duid(time_t now);
 
 /* rfc3315.c */
 #ifdef HAVE_DHCP6
-size_t dhcp6_reply(struct dhcp_context *context, int interface, char *iface_name, size_t sz, int is_multicast, time_t now);
+size_t dhcp6_reply(struct dhcp_context *context, int interface, char *iface_name,  
+		   struct in6_addr *fallback, size_t sz, int is_multicast, time_t now);
 #endif
 
 /* dhcp-common.c */
@@ -1052,4 +1059,28 @@ void log_tags(struct dhcp_netid *netid, u32 xid);
 int match_bytes(struct dhcp_opt *o, unsigned char *p, int len);
 void dhcp_update_configs(struct dhcp_config *configs);
 void check_dhcp_hosts(int fatal);
+#  ifdef HAVE_DHCP6
+void join_multicast(void);
+#  endif
+#endif
+
+/* outpacket.c */
+#ifdef HAVE_DHCP6
+void end_opt6(int container);
+int save_counter(int newval);
+void *expand(size_t headroom);
+int new_opt6(int opt);
+void *put_opt6(void *data, size_t len);
+void put_opt6_long(unsigned int val);
+void put_opt6_short(unsigned int val);
+void put_opt6_char(unsigned int val);
+void put_opt6_string(char *s);
+#endif
+
+/* radv.c */
+#ifdef HAVE_DHCP6
+void ra_init(time_t now);
+void icmp6_packet(void);
+time_t periodic_ra(time_t now);
+void ra_start_unsolicted(time_t now);
 #endif

src/forward.c

@@ -106,8 +106,11 @@ void send_from(int fd, int nowild, char *packet, size_t len,
 	  msg.msg_controllen = 0;
 	  goto retry;
 	}
+      
       if (retry_send())
 	goto retry;
+      
+      my_syslog(LOG_ERR, _("failed to send packet: %s"), strerror(errno));
     }
 }
           
@@ -763,12 +766,33 @@ void receive_query(struct listener *listen, time_t now)
 	  !iface_check(listen->family, &dst_addr, ifr.ifr_name))
 	return;
       
-      if (listen->family == AF_INET &&
-	  option_bool(OPT_LOCALISE) &&
-	  ioctl(listen->fd, SIOCGIFNETMASK, &ifr) == -1)
-	return;
-      
-      netmask = ((struct sockaddr_in *) &ifr.ifr_addr)->sin_addr;
+      if (listen->family == AF_INET && option_bool(OPT_LOCALISE))
+	{
+	  struct irec *iface;
+	  
+	  /* get the netmask of the interface whch has the address we were sent to.
+	     This is no neccessarily the interface we arrived on. */
+	  
+	  for (iface = daemon->interfaces; iface; iface = iface->next)
+	    if (iface->addr.sa.sa_family == AF_INET &&
+		iface->addr.in.sin_addr.s_addr == dst_addr_4.s_addr)
+	      break;
+	  
+	  /* interface may be new */
+	  if (!iface)
+	    enumerate_interfaces(); 
+	  
+	  for (iface = daemon->interfaces; iface; iface = iface->next)
+	    if (iface->addr.sa.sa_family == AF_INET &&
+		iface->addr.in.sin_addr.s_addr == dst_addr_4.s_addr)
+	      break;
+	  
+	  /* If we failed, abandon localisation */
+	  if (iface)
+	    netmask = iface->netmask;
+	  else
+	    dst_addr_4.s_addr = 0;
+	}
     }
   
   if (extract_request(header, (size_t)n, daemon->namebuff, &type))

src/lease.c

@@ -313,7 +313,15 @@ void lease_update_file(time_t now)
     }
   
   /* Set alarm for when the first lease expires + slop. */
-  for (next_event = 0, lease = leases; lease; lease = lease->next)
+  next_event = 0;
+
+#ifdef HAVE_DHCP6
+  /* do timed RAs and determine when the next is */
+  if (daemon->ra_contexts)
+    next_event = periodic_ra(now);
+#endif
+
+  for (lease = leases; lease; lease = lease->next)
     if (lease->expires != 0 &&
 	(next_event == 0 || difftime(next_event, lease->expires + 10) > 0.0))
       next_event = lease->expires + 10;
@@ -606,7 +614,8 @@ void lease_set_expires(struct dhcp_lease *lease, unsigned int len, time_t now)
   if (len != lease->length)
     {
       lease->length = len;
-      lease->aux_changed = file_dirty = 1; 
+      lease->flags |= LEASE_AUX_CHANGED;
+      file_dirty = 1; 
     }
 #endif
 } 

src/netlink.c

@@ -136,6 +136,7 @@ int iface_enumerate(int family, void *parm, int (*callback)())
   struct nlmsghdr *h;
   ssize_t len;
   static unsigned int seq = 0;
+  int callback_ok = 1;
 
   struct {
     struct nlmsghdr nlh;
@@ -186,7 +187,7 @@ int iface_enumerate(int family, void *parm, int (*callback)())
 	else if (h->nlmsg_type == NLMSG_ERROR)
 	  nl_err(h);
 	else if (h->nlmsg_type == NLMSG_DONE)
-	  return 1;
+	  return callback_ok;
 	else if (h->nlmsg_type == RTM_NEWADDR && family != AF_UNSPEC && family != AF_LOCAL)
 	  {
 	    struct ifaddrmsg *ifa = NLMSG_DATA(h);  
@@ -213,9 +214,9 @@ int iface_enumerate(int family, void *parm, int (*callback)())
 			rta = RTA_NEXT(rta, len1);
 		      }
 		    
-		    if (addr.s_addr)
+		    if (addr.s_addr && callback_ok)
 		      if (!((*callback)(addr, ifa->ifa_index, netmask, broadcast, parm)))
-			return 0;
+			callback_ok = 0;
 		  }
 #ifdef HAVE_IPV6
 		else if (ifa->ifa_family == AF_INET6)
@@ -229,10 +230,10 @@ int iface_enumerate(int family, void *parm, int (*callback)())
 			rta = RTA_NEXT(rta, len1);
 		      }
 		    
-		    if (addrp)
+		    if (addrp && callback_ok)
 		      if (!((*callback)(addrp, (int)(ifa->ifa_prefixlen), (int)(ifa->ifa_scope), 
 					(int)(ifa->ifa_index), (int)(ifa->ifa_flags & IFA_F_TENTATIVE), parm)))
-			return 0;
+			callback_ok = 0;
 		  }
 #endif
 	      }
@@ -258,9 +259,9 @@ int iface_enumerate(int family, void *parm, int (*callback)())
 		rta = RTA_NEXT(rta, len1);
 	      }
 
-	    if (inaddr && mac)
+	    if (inaddr && mac && callback_ok)
 	      if (!((*callback)(neigh->ndm_family, inaddr, mac, maclen, parm)))
-		return 0;
+		callback_ok = 0;
 	  }
 #ifdef HAVE_DHCP6
 	else if (h->nlmsg_type == RTM_NEWLINK && family == AF_LOCAL)
@@ -282,9 +283,9 @@ int iface_enumerate(int family, void *parm, int (*callback)())
 		rta = RTA_NEXT(rta, len1);
 	      }
 
-	    if (mac && !((link->ifi_flags & (IFF_LOOPBACK | IFF_POINTOPOINT))) && 
-		!((*callback)((unsigned int)link->ifi_type, mac, maclen, parm)))
-	      return 0;
+	    if (mac && callback_ok && !((link->ifi_flags & (IFF_LOOPBACK | IFF_POINTOPOINT))) && 
+		!((*callback)((int)link->ifi_index, (unsigned int)link->ifi_type, mac, maclen, parm)))
+	      callback_ok = 0;
 	  }
 #endif
     }
@@ -340,6 +341,17 @@ static void nl_routechange(struct nlmsghdr *h)
       /* Force re-reading resolv file right now, for luck. */
       daemon->last_resolv = 0;
       
+#ifdef HAVE_DHCP6
+      /* force RAs to sync new network and pick up new interfaces.  */
+      if (daemon->ra_contexts)
+	{
+	  ra_start_unsolicted(dnsmasq_time());
+	  /* cause lease_update_file to run after we return, in case we were called from
+	     iface_enumerate and can't re-enter it now */
+	  send_alarm();
+	}
+#endif
+
       if (daemon->srv_save)
 	{
 	  if (daemon->srv_save->sfd)

src/option.c

@@ -114,6 +114,7 @@ struct myoption {
 #define LOPT_CONNTRACK 303
 #define LOPT_FQDN      304
 #define LOPT_LUASCRIPT 305
+#define LOPT_RA        306
 
 #ifdef HAVE_GETOPT_LONG
 static const struct option opts[] =  
@@ -233,6 +234,7 @@ static const struct myoption opts[] =
     { "conntrack", 0, 0, LOPT_CONNTRACK },
     { "dhcp-client-update", 0, 0, LOPT_FQDN },
     { "dhcp-luascript", 1, 0, LOPT_LUASCRIPT },
+    { "enable-ra", 0, 0, LOPT_RA },
     { NULL, 0, 0, 0 }
   };
 
@@ -359,6 +361,7 @@ static struct {
   { LOPT_INCR_ADDR, OPT_CONSEC_ADDR, NULL, gettext_noop("Attempt to allocate sequential IP addresses to DHCP clients."), NULL },
   { LOPT_CONNTRACK, OPT_CONNTRACK, NULL, gettext_noop("Copy connection-track mark from queries to upstream connections."), NULL },
   { LOPT_FQDN, OPT_FQDN_UPDATE, NULL, gettext_noop("Allow DHCP clients to do their own DDNS updates."), NULL },
+  { LOPT_RA, OPT_RA, NULL, gettext_noop("Send router-advertisements for interfaces doing DHCPv6"), NULL },
   { 0, 0, NULL, NULL, NULL }
 }; 
 
@@ -2330,17 +2333,32 @@ static char *one_opt(int option, char *arg, char *gen_prob, int command_line)
 #ifdef HAVE_DHCP6
 	else if (inet_pton(AF_INET6, a[0], &new->start6))
 	  {
-	    new->next = daemon->dhcp6;
 	    new->prefix = 64; /* default */
-	    daemon->dhcp6 = new;
+	    
 	    if (strcmp(a[1], "static") == 0)
 	      {
 		memcpy(&new->end6, &new->start6, IN6ADDRSZ);
 		new->flags |= CONTEXT_STATIC;
 	      }
+	    else if (strcmp(a[1], "ra-only") == 0)
+	      {
+		memcpy(&new->end6, &new->start6, IN6ADDRSZ);
+		new->flags |= CONTEXT_RA_ONLY;
+	      }
 	    else if (!inet_pton(AF_INET6, a[1], &new->end6))
 	      option = '?';
 	    
+	    if (new->flags & CONTEXT_RA_ONLY)
+	      {
+		new->next = daemon->ra_contexts;
+		daemon->ra_contexts = new;
+	      }
+	    else
+	      {
+		new->next = daemon->dhcp6;
+		daemon->dhcp6 = new;
+	      }
+
 	    /* bare integer < 128 is prefix value */
 	    if (option != '?' && k >= 3)
 	      {
@@ -2403,6 +2421,16 @@ static char *one_opt(int option, char *arg, char *gen_prob, int command_line)
 		  }
 	      }
 	  }
+
+#ifdef HAVE_DHCP6
+	/* lifetimes must be min 2 hrs, by RFC 2462.
+	   This gets enforced in radv.c for DHCP ranges
+	   which are legitimately less. */
+	if ((new->flags & CONTEXT_RA_ONLY) &&
+	    new->lease_time < 7200)
+	  new->lease_time = 7200;
+#endif
+	    
 	break;
       }
 

src/outpacket.c

@@ -0,0 +1,108 @@
+/* dnsmasq is Copyright (c) 2000-2012 Simon Kelley
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 dated June, 1991, or
+   (at your option) version 3 dated 29 June, 2007.
+ 
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+     
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+
+#include "dnsmasq.h"
+ 
+#ifdef HAVE_DHCP6
+
+static size_t outpacket_counter;
+
+void end_opt6(int container)
+{
+   void *p = daemon->outpacket.iov_base + container + 2;
+   u16 len = outpacket_counter - container - 4 ;
+   
+   PUTSHORT(len, p);
+}
+
+int save_counter(int newval)
+{
+  int ret = outpacket_counter;
+  if (newval != -1)
+    outpacket_counter = newval;
+
+  return ret;
+}
+
+void *expand(size_t headroom)
+{
+  void *ret;
+
+  if (expand_buf(&daemon->outpacket, outpacket_counter + headroom))
+    {
+      ret = daemon->outpacket.iov_base + outpacket_counter;
+      outpacket_counter += headroom;
+      return ret;
+    }
+  
+  return NULL;
+}
+    
+int new_opt6(int opt)
+{
+  int ret = outpacket_counter;
+  void *p;
+
+  if ((p = expand(4)))
+    {
+      PUTSHORT(opt, p);
+      PUTSHORT(0, p);
+    }
+
+  return ret;
+}
+
+void *put_opt6(void *data, size_t len)
+{
+  void *p;
+
+  if ((p = expand(len)))
+    memcpy(p, data, len);   
+
+  return p;
+}
+  
+void put_opt6_long(unsigned int val)
+{
+  void *p;
+  
+  if ((p = expand(4)))  
+    PUTLONG(val, p);
+}
+
+void put_opt6_short(unsigned int val)
+{
+  void *p;
+
+  if ((p = expand(2)))
+    PUTSHORT(val, p);   
+}
+
+void put_opt6_char(unsigned int val)
+{
+  unsigned char *p;
+
+  if ((p = expand(1)))
+    *p = val;   
+}
+
+void put_opt6_string(char *s)
+{
+  put_opt6(s, strlen(s));
+}
+
+#endif

src/radv-protocol.h

@@ -0,0 +1,44 @@
+/* dnsmasq is Copyright (c) 2000-2012 Simon Kelley
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 dated June, 1991, or
+   (at your option) version 3 dated 29 June, 2007.
+ 
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+     
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#define ALL_HOSTS                 "FF02::1"
+#define ALL_ROUTERS               "FF02::2"
+
+struct ra_packet {
+  u8 type, code;
+  u16 checksum;
+  u8 hop_limit, flags;
+  u16 lifetime;
+  u32 reachable_time;
+  u32 retrans_time;
+};
+
+struct prefix_opt {
+  u8 type, len, prefix_len, flags;
+  u32 valid_lifetime, preferred_lifetime, reserved;
+  struct in6_addr prefix;
+};
+
+#define ICMP6_ROUTER_SOLICIT 133
+#define ICMP6_ROUTER_ADVERT  134
+
+#define ICMP6_OPT_SOURCE_MAC   1
+#define ICMP6_OPT_PREFIX       3
+#define ICMP6_OPT_MTU          5
+#define ICMP6_OPT_RDNSS       25
+
+
+

src/radv.c

@@ -0,0 +1,429 @@
+/* dnsmasq is Copyright (c) 2000-2012 Simon Kelley
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 dated June, 1991, or
+   (at your option) version 3 dated 29 June, 2007.
+ 
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+     
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+
+/* NB. This code may be called during a DHCPv4 or transaction which is in ping-wait
+   It therefore cannot use any DHCP buffer resources except outpacket, which is
+   not used by DHCPv4 code. This code may also be called when DHCP 4 or 6 isn't
+   active, so we ensure that outpacket is allocated here too */
+
+#include "dnsmasq.h"
+
+#ifdef HAVE_DHCP6
+
+#include <netinet/icmp6.h>
+
+struct ra_param {
+  int ind, managed, found_context, first;
+  char *if_name;
+  struct in6_addr link_local;
+};
+
+struct search_param {
+  time_t now; int iface;
+};
+
+static void send_ra(int iface, char *iface_name, struct in6_addr *dest);
+static int add_prefixes(struct in6_addr *local,  int prefix,
+			int scope, int if_index, int dad, void *vparam);
+static int iface_search(struct in6_addr *local,  int prefix,
+			int scope, int if_index, int dad, void *vparam);
+static int add_lla(int index, unsigned int type, char *mac, size_t maclen, void *parm);
+
+static int hop_limit;
+static time_t ra_short_period_start;
+
+void ra_init(time_t now)
+{
+  struct icmp6_filter filter;
+  int fd;
+#if defined(IP_TOS) && defined(IPTOS_CLASS_CS6)
+  int class = IPTOS_CLASS_CS6;
+#endif
+  int val = 255; /* radvd uses this value */
+  socklen_t len = sizeof(int);
+
+  /* ensure this is around even if we're not doing DHCPv6 */
+  expand_buf(&daemon->outpacket, sizeof(struct dhcp_packet));
+
+  ICMP6_FILTER_SETBLOCKALL(&filter);
+  ICMP6_FILTER_SETPASS(ND_ROUTER_SOLICIT, &filter);
+  ICMP6_FILTER_SETPASS(ND_ROUTER_ADVERT, &filter);
+  
+  if ((fd = socket(PF_INET6, SOCK_RAW, IPPROTO_ICMPV6)) == -1 ||
+      getsockopt(fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &hop_limit, &len) ||
+#if defined(IP_TOS) && defined(IPTOS_CLASS_CS6)
+      setsockopt(fd, IPPROTO_IPV6, IPV6_TCLASS, &class, sizeof(class)) == -1 ||
+#endif
+      !fix_fd(fd) ||
+      !set_ipv6pktinfo(fd) ||
+      setsockopt(fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &val, sizeof(val)) ||
+      setsockopt(fd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &val, sizeof(val)) ||
+      setsockopt(fd, IPPROTO_ICMPV6, ICMP6_FILTER, &filter, sizeof(filter)) == -1)
+    die (_("cannot create ICMPv6 socket: %s"), NULL, EC_BADNET);
+  
+   daemon->icmp6fd = fd;
+   
+   ra_start_unsolicted(now);
+}
+
+void ra_start_unsolicted(time_t now)
+{   
+   struct dhcp_context *context;
+   
+   /* init timers so that we do ra's for all soon. some ra_times will end up zeroed
+     if it's not appropriate to advertise those contexts.
+     This gets re-called on a netlink route-change to re-do the advertisement
+     and pick up new interfaces */
+
+   /* range 0 - 5 */
+   for (context = daemon->ra_contexts; context; context = context->next)
+     context->ra_time = now + (rand16()/13000);
+
+   /* re-do frequently for a minute or so, in case the first gets lost. */
+   ra_short_period_start = now;
+}
+
+void icmp6_packet(void)
+{
+  char interface[IF_NAMESIZE+1];
+  ssize_t sz; 
+  int if_index = 0;
+  struct cmsghdr *cmptr;
+  struct msghdr msg;
+  union {
+    struct cmsghdr align; /* this ensures alignment */
+    char control6[CMSG_SPACE(sizeof(struct in6_pktinfo))];
+  } control_u;
+  struct sockaddr_in6 from;
+  unsigned char *p;
+  char *mac = "";
+  struct iname *tmp;
+  struct dhcp_context *context;
+
+  /* Note: use outpacket for input buffer */
+  msg.msg_control = control_u.control6;
+  msg.msg_controllen = sizeof(control_u);
+  msg.msg_flags = 0;
+  msg.msg_name = &from;
+  msg.msg_namelen = sizeof(from);
+  msg.msg_iov = &daemon->outpacket;
+  msg.msg_iovlen = 1;
+  
+  if ((sz = recv_dhcp_packet(daemon->icmp6fd, &msg)) == -1 || sz < 8)
+    return;
+  
+  for (cmptr = CMSG_FIRSTHDR(&msg); cmptr; cmptr = CMSG_NXTHDR(&msg, cmptr))
+    if (cmptr->cmsg_level == IPPROTO_IPV6 && cmptr->cmsg_type == daemon->v6pktinfo)
+      {
+	union {
+	  unsigned char *c;
+	  struct in6_pktinfo *p;
+	} p;
+	p.c = CMSG_DATA(cmptr);
+        
+	if_index = p.p->ipi6_ifindex;
+      }
+  
+  if (!indextoname(daemon->icmp6fd, if_index, interface))
+    return;
+    
+  if (!iface_check(AF_LOCAL, NULL, interface))
+    return;
+  
+  for (tmp = daemon->dhcp_except; tmp; tmp = tmp->next)
+    if (tmp->name && (strcmp(tmp->name, interface) == 0))
+      return;
+ 
+  /* weird libvirt-inspired access control */
+  for (context = daemon->dhcp6; context; context = context->next)
+    if (!context->interface || strcmp(context->interface, interface) == 0)
+      break;
+  
+  if (!context)
+    return;
+
+  p = (unsigned char *)daemon->outpacket.iov_base;
+  
+  if (p[0] != ICMP6_ROUTER_SOLICIT || p[1] != 0)
+    return;
+  
+  /* look for link-layer address option for logging */
+  if (sz >= 16 && p[8] == ICMP6_OPT_SOURCE_MAC && (p[9] * 8) + 8 <= sz)
+    {
+      print_mac(daemon->namebuff, &p[10], (p[9] * 8) - 2);
+      mac = daemon->namebuff;
+    }
+  
+  my_syslog(MS_DHCP | LOG_INFO, "RTR-SOLICIT(%s) %s", interface, mac);
+  
+  send_ra(if_index, interface, &from.sin6_addr);
+}
+
+static void send_ra(int iface, char *iface_name, struct in6_addr *dest)
+{
+  struct ra_packet *ra;
+  struct ra_param parm;
+  struct ifreq ifr;
+  struct sockaddr_in6 addr;
+  struct dhcp_context *context;
+ 
+  save_counter(0);
+  ra = expand(sizeof(struct ra_packet));
+  
+  ra->type = ICMP6_ROUTER_ADVERT;
+  ra->code = 0;
+  ra->hop_limit = hop_limit;
+  ra->flags = 0;
+  ra->lifetime = htons(1800); /* AdvDefaultLifetime*/
+  ra->reachable_time = 0;
+  ra->retrans_time = 0;
+
+  parm.ind = iface;
+  parm.managed = 0;
+  parm.found_context = 0;
+  parm.if_name = iface_name;
+  parm.first = 1;
+
+  for (context = daemon->ra_contexts; context; context = context->next)
+    context->flags &= ~CONTEXT_RA_DONE;
+  
+  if (!iface_enumerate(AF_INET6, &parm, add_prefixes) ||
+      !parm.found_context)
+    return;
+
+  strncpy(ifr.ifr_name, iface_name, IF_NAMESIZE);
+  
+  if (ioctl(daemon->icmp6fd, SIOCGIFMTU, &ifr) != -1)
+    {
+      put_opt6_char(ICMP6_OPT_MTU);
+      put_opt6_char(1);
+      put_opt6_short(0);
+      put_opt6_long(ifr.ifr_mtu);
+    }
+     
+  iface_enumerate(AF_LOCAL, &iface, add_lla);
+  
+  /* RDNSS, RFC 6106 */
+  put_opt6_char(ICMP6_OPT_RDNSS);
+  put_opt6_char(3);
+  put_opt6_short(0);
+  put_opt6_long(1800); /* lifetime - twice RA retransmit */
+  put_opt6(&parm.link_local, IN6ADDRSZ);
+
+
+  /* set managed bits unless we're providing only RA on this link */
+  if (parm.managed)
+    ra->flags = 0xc0; 
+
+  /* decide where we're sending */
+  memset(&addr, 0, sizeof(addr));
+#ifdef HAVE_SOCKADDR_SA_LEN
+  addr.sin6_len = sizeof(struct sockaddr_in6);
+#endif
+  addr.sin6_family = AF_INET6;
+  addr.sin6_port = htons(IPPROTO_ICMPV6);
+  if (dest)
+    {
+      memcpy(&addr.sin6_addr, dest, sizeof(struct in6_addr));
+      if (IN6_IS_ADDR_LINKLOCAL(dest) ||
+	  IN6_IS_ADDR_MC_LINKLOCAL(dest))
+	addr.sin6_scope_id = iface;
+    }
+  else
+    inet_pton(AF_INET6, ALL_HOSTS, &addr.sin6_addr); 
+  
+  send_from(daemon->icmp6fd, 0, daemon->outpacket.iov_base, save_counter(0),
+	    (union mysockaddr *)&addr, (struct all_addr *)&parm.link_local, iface); 
+  
+}
+
+static int add_prefixes(struct in6_addr *local,  int prefix,
+			int scope, int if_index, int dad, void *vparam)
+{
+  struct dhcp_context *context, *tmp;
+  struct ra_param *param = vparam;
+  struct prefix_opt *opt;
+
+  (void)scope; /* warning */
+  (void)dad;
+
+  if (if_index == param->ind)
+    {
+      if (IN6_IS_ADDR_LINKLOCAL(local))
+	param->link_local = *local;
+      else if (!IN6_IS_ADDR_LOOPBACK(local) &&
+	       !IN6_IS_ADDR_LINKLOCAL(local) &&
+	       !IN6_IS_ADDR_MULTICAST(local))
+	{
+	  for (context = daemon->ra_contexts; context; context = context->next)
+	    if (prefix == context->prefix &&
+		is_same_net6(local, &context->start6, prefix) &&
+		is_same_net6(local, &context->end6, prefix))
+	      {
+		if (!(context->flags & CONTEXT_RA_ONLY))
+		  {
+		    /* don't do RA for non-ra-only unless --enable-ra is set */
+		    if (!option_bool(OPT_RA))
+		      continue;
+		    param->managed = 1;
+		  }
+
+		if (context->flags & CONTEXT_RA_DONE)
+		  continue;
+		
+		/* subsequent prefixes on the same interface don't need timers */
+		if (!param->first)
+		  context->ra_time = 0;
+		param->first = 0;
+		param->found_context = 1;
+		context->flags |= CONTEXT_RA_DONE;
+
+		/* mark this subnet and duplicates: as done. */
+		for (tmp = context->next; tmp; tmp = tmp->next)
+		  if (tmp->prefix == prefix &&
+		      is_same_net6(local, &tmp->start6, prefix) &&
+		      is_same_net6(local, &tmp->end6, prefix))
+		    {
+		      tmp->flags |= CONTEXT_RA_DONE;
+		      context->ra_time = 0;
+		    }
+
+		if ((opt = expand(sizeof(struct prefix_opt))))
+		  {
+		    u64 addrpart = addr6part(&context->start6);
+		    u64 mask = (prefix == 64) ? (u64)-1LL : (1LLU << (128 - prefix)) - 1LLU;
+		    unsigned int time = context->lease_time;
+
+		    /* lifetimes must be min 2 hrs, by RFC 2462 */
+		    if (time < 7200)
+		      time = 7200;
+
+		    opt->type = ICMP6_OPT_PREFIX;
+		    opt->len = 4;
+		    opt->prefix_len = prefix;
+		    /* autonomous only is we're not doing dhcp */
+		    opt->flags = (context->flags & CONTEXT_RA_ONLY) ? 0xc0 : 0x00;
+		    opt->valid_lifetime = opt->preferred_lifetime = htonl(time);
+		    opt->reserved = 0;
+		    
+		    opt->prefix = context->start6;
+		    setaddr6part(&opt->prefix, addrpart & ~mask);
+		    
+		    inet_ntop(AF_INET6, &opt->prefix, daemon->addrbuff, ADDRSTRLEN);
+		    my_syslog(MS_DHCP | LOG_INFO, "RTR-ADVERT(%s) %s", param->if_name, daemon->addrbuff); 		    
+		  }
+	      }
+	}
+    }          
+  return 1;
+}
+
+static int add_lla(int index, unsigned int type, char *mac, size_t maclen, void *parm)
+{
+  (void)type;
+
+  if (index == *((int *)parm))
+    {
+      /* size is in units of 8 octets and includes type and length (2 bytes)
+	 add 7 to round up */
+      int len = (maclen + 9) >> 3;
+      unsigned char *p = expand(len << 3);
+      memset(p, 0, len << 3);
+      *p++ = ICMP6_OPT_SOURCE_MAC;
+      *p++ = len;
+      memcpy(p, mac, maclen);
+
+      return 0;
+    }
+
+  return 1;
+}
+
+time_t periodic_ra(time_t now)
+{
+  struct search_param param;
+  struct dhcp_context *context;
+  time_t next_event;
+  char interface[IF_NAMESIZE+1];
+  
+  param.now = now;
+
+  while (1)
+    {
+      /* find overdue events, and time of first future event */
+      for (next_event = 0, context = daemon->ra_contexts; context; context = context->next)
+	if (context->ra_time != 0)
+	  {
+	    if (difftime(context->ra_time, now) < 0.0)
+	      break; /* overdue */
+	    
+	    if (next_event == 0 || difftime(next_event, context->ra_time + 2) > 0.0)
+	      next_event = context->ra_time + 2;
+	  }
+      
+      /* none overdue */
+      if (!context)
+	break;
+      
+      /* There's a context overdue, but we can't find an interface
+	 associated with it, because it's for a subnet we dont 
+	 have an interface on. Probably we're doing DHCP on
+	 a remote subnet via a relay. Zero the timer, since we won't
+	 ever be able to send ra's and satistfy it. */
+      if (iface_enumerate(AF_INET6, &param, iface_search))
+	context->ra_time = 0;
+      else if (indextoname(daemon->icmp6fd, param.iface, interface))
+	send_ra(param.iface, interface, NULL); 
+    }
+  
+  return next_event;
+}
+
+static int iface_search(struct in6_addr *local,  int prefix,
+			int scope, int if_index, int dad, void *vparam)
+{
+  struct search_param *param = vparam;
+  struct dhcp_context *context;
+
+  (void)scope;
+  (void)dad;
+ 
+  for (context = daemon->ra_contexts; context; context = context->next)
+    if (prefix == context->prefix &&
+	is_same_net6(local, &context->start6, prefix) &&
+	is_same_net6(local, &context->end6, prefix))
+      if (context->ra_time != 0 && difftime(context->ra_time, param->now) < 0.0)
+	{
+	  /* found an interface that's overdue for RA determine new 
+	     timeout value and zap other contexts on the same interface 
+	     so they don't timeout independently .*/
+	  param->iface = if_index;
+	  
+	  if (difftime(param->now, ra_short_period_start) < 60.0)
+	    /* range 5 - 20 */
+	    context->ra_time = param->now + 5 + (rand16()/4400);
+	  else
+	    /* range 450 - 600 */
+	    context->ra_time = param->now + 450 + (rand16()/440);
+	  
+	  return 0; /* found, abort */
+	}
+  
+  return 1; /* keep searching */
+}
+
+#endif

src/rfc1035.c

@@ -25,7 +25,7 @@ static int add_resource_record(struct dns_header *header, char *limit, int *trun
     ((size_t)((pp) - (unsigned char *)(header) + (len)) <= (plen))
 
 #define ADD_RDLEN(header, pp, plen, len) \
-    (!CHECK_LEN(header, pp, plen, len) ? 0 : (long)((pp) += (len)), 1)
+  (!CHECK_LEN(header, pp, plen, len) ? 0 : (((pp) += (len)), 1))
 
 static int extract_name(struct dns_header *header, size_t plen, unsigned char **pp, 
 			char *name, int isExtract, int extrabytes)

src/rfc3315.c

@@ -19,21 +19,10 @@
 
 #ifdef HAVE_DHCP6
 
-static size_t outpacket_counter;
-
-static void end_opt6(int container);
-static int save_counter(int newval);
-static void *expand(size_t headroom);
-static int new_opt6(int opt);
-static void *put_opt6(void *data, size_t len);
-static void put_opt6_short(unsigned int val);
-static void put_opt6_long(unsigned int val);
-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);
+			     int interface, char *iface_name, struct in6_addr *fallback, void *inbuff, size_t sz, int is_unicast, time_t now);
 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);
+			  int interface, char *iface_name, struct in6_addr *fallback, 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);
 
 static void *opt6_find (void *opts, void *end, unsigned int search, unsigned int minsize);
@@ -45,7 +34,8 @@ static unsigned int opt6_uint(unsigned char *opt, int offset, int size);
 #define opt6_ptr(opt, i) ((void *)&(((unsigned char *)(opt))[4+(i)]))
 
 
-size_t dhcp6_reply(struct dhcp_context *context, int interface, char *iface_name, size_t sz, int is_unicast, time_t now)
+size_t dhcp6_reply(struct dhcp_context *context, int interface, char *iface_name,
+		   struct in6_addr *fallback, size_t sz, int is_unicast, time_t now)
 {
   struct dhcp_netid *relay_tags = NULL;
   struct dhcp_vendor *vendor;
@@ -54,17 +44,17 @@ size_t dhcp6_reply(struct dhcp_context *context, int interface, char *iface_name
   for (vendor = daemon->dhcp_vendors; vendor; vendor = vendor->next)
     vendor->netid.next = &vendor->netid;
   
-  outpacket_counter = 0;
+  save_counter(0);
   
-  if (dhcp6_maybe_relay(NULL, &relay_tags, context, interface, iface_name, daemon->dhcp_packet.iov_base, sz, is_unicast, now))
-    return outpacket_counter;
+  if (dhcp6_maybe_relay(NULL, &relay_tags, context, interface, iface_name, fallback, daemon->dhcp_packet.iov_base, sz, is_unicast, now))
+    return save_counter(0);
 
   return 0;
 }
 
 /* This cost me blood to write, it will probably cost you blood to understand - srk. */
 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)
+			     int interface, char *iface_name, struct in6_addr *fallback, void *inbuff, size_t sz, int is_unicast, time_t now)
 {
   void *end = inbuff + sz;
   void *opts = inbuff + 34;
@@ -114,7 +104,7 @@ static int dhcp6_maybe_relay(struct in6_addr *link_address, struct dhcp_netid **
 	  return 0;
 	}
 
-      return dhcp6_no_relay(msg_type, link_address, *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, fallback, inbuff, sz, is_unicast, now);
     }
 
   /* must have at least msg_type+hopcount+link_address+peer_address+minimal size option
@@ -159,7 +149,7 @@ static int dhcp6_maybe_relay(struct in6_addr *link_address, struct dhcp_netid **
 	  memcpy(&link_address, inbuff + 2, IN6ADDRSZ); 
 	  /* Not, zero is_unicast since that is now known to refer to the 
 	     relayed packet, not the original sent by the client */
-	  if (!dhcp6_maybe_relay(&link_address, relay_tagsp, context, interface, iface_name, opt6_ptr(opt, 0), opt6_len(opt), 0, now))
+	  if (!dhcp6_maybe_relay(&link_address, relay_tagsp, context, interface, iface_name, fallback, opt6_ptr(opt, 0), opt6_len(opt), 0, now))
 	    return 0;
 	}
       else
@@ -171,7 +161,7 @@ static int dhcp6_maybe_relay(struct in6_addr *link_address, struct dhcp_netid **
 }
 
 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)
+			  int interface, char *iface_name, struct in6_addr *fallback, void *inbuff, size_t sz, int is_unicast, time_t now)
 {
   void *packet_options = inbuff + 4;
   void *end = inbuff + sz;
@@ -394,7 +384,7 @@ static int dhcp6_no_relay(int msg_type, struct in6_addr *link_address, struct dh
 	      if (!config)
 		{
 		  /* Search again now we have a hostname. 
-		     Only accept configs without CLID and HWADDR here, (they won't match)
+		     Only accept configs without CLID here, (it won't match)
 		     to avoid impersonation by name. */
 		  struct dhcp_config *new = find_config6(daemon->dhcp_conf, context, NULL, 0, hostname);
 		  if (new && !have_config(new, CONFIG_CLID) && !new->hwaddr)
@@ -422,18 +412,31 @@ static int dhcp6_no_relay(int msg_type, struct in6_addr *link_address, struct dh
       if (have_config(config, CONFIG_DISABLE))
 	ignore = 1;
     }
+   
+  tagif = run_tag_if(tags);
   
   /* if all the netids in the ignore list are present, ignore this client */
   if (daemon->dhcp_ignore)
     {
       struct dhcp_netid_list *id_list;
      
-      tagif = run_tag_if(tags);
-      
       for (id_list = daemon->dhcp_ignore; id_list; id_list = id_list->next)
 	if (match_netid(id_list->list, tagif, 0))
 	  ignore = 1;
     }
+  
+  /* 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;
+    }
+  
 
   switch (msg_type)
     {
@@ -508,7 +511,8 @@ static int dhcp6_no_relay(int msg_type, struct in6_addr *link_address, struct dh
 		    struct in6_addr *req_addr = opt6_ptr(ia_option, 0);
 		    preferred_time = opt6_uint(ia_option, 16, 4);
 		    
-		    if (!address6_available(context, req_addr, tags))
+		    if (!address6_available(context, req_addr, tags) &&
+			(!have_config(config, CONFIG_ADDR6) || memcmp(&config->addr6, req_addr, IN6ADDRSZ) != 0))
 		      {
 			if (msg_type == DHCP6REQUEST)
 			  {
@@ -584,13 +588,23 @@ static int dhcp6_no_relay(int msg_type, struct in6_addr *link_address, struct dh
 		    address_assigned = 1;
 		    
 		    /* shouldn't ever fail */
-		    if ((this_context = narrow_context6(context, addrp, tags)))
+		    if ((this_context = narrow_context6(context, addrp, tagif)))
 		      {
 			/* get tags from context if we've not used it before */
-			if (this_context->netid.next != &this_context->netid && this_context->netid.net)
+			if (this_context->netid.next == &this_context->netid && this_context->netid.net)
 			  {
 			    this_context->netid.next = context_tags;
 			    context_tags = &this_context->netid;
+			    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, &this_context->netid, 0))
+				    break;
+				if (id_list)
+				  hostname = NULL;
+			      }
 			  }
 			
 			lease_time = have_config(valid_config, CONFIG_TIME) ? valid_config->lease_time : this_context->lease_time;
@@ -653,13 +667,21 @@ static int dhcp6_no_relay(int msg_type, struct in6_addr *link_address, struct dh
 						    client_hostname ? strlen(client_hostname) : 0, 0);				
 				
 				/* space-concat tag set */
-				if (!tags)
+				if (!tagif && !context_tags)
 				  lease_add_extradata(lease, NULL, 0, 0);
 				else
 				  {
-				    struct dhcp_netid *n;
+				    struct dhcp_netid *n, *l, *tmp = tags;
 				    
-				    for (n = run_tag_if(tags); n; n = n->next)
+				    /* link temporarily */
+				    for (n = context_tags; n && n->next; n = n->next);
+				    if ((l = n))
+				      {
+					l->next = tags;
+					tmp = context_tags;
+				      }
+				    
+				    for (n = run_tag_if(tmp); n; n = n->next)
 				      {
 					struct dhcp_netid *n1;
 					/* kill dupes */
@@ -669,6 +691,10 @@ static int dhcp6_no_relay(int msg_type, struct in6_addr *link_address, struct dh
 					if (!n1)
 					  lease_add_extradata(lease, (unsigned char *)n->net, strlen(n->net), n->next ? ' ' : 0); 
 				      }
+
+				    /* unlink again */
+				    if (l)
+				      l->next = NULL;
 				  }
 
 				if (link_address)
@@ -820,17 +846,27 @@ static int dhcp6_no_relay(int msg_type, struct in6_addr *link_address, struct dh
 		    break;
 		  }
 		
-		tagif = run_tag_if(tags);
+		
 		if (!address6_available(context, req_addr, tagif) || 
 		    !(this_context = narrow_context6(context, req_addr, tagif)))
 		  lease_time = 0;
 		else
 		  {
 		    /* get tags from context if we've not used it before */
-		    if (this_context->netid.next != &this_context->netid && this_context->netid.net)
+		    if (this_context->netid.next == &this_context->netid && this_context->netid.net)
 		      {
 			this_context->netid.next = context_tags;
 			context_tags = &this_context->netid;
+			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, &this_context->netid, 0))
+				break;
+			    if (id_list)
+			      hostname = NULL;
+			  }
 		      }
 		    
 		    lease_time = have_config(valid_config, CONFIG_TIME) ? valid_config->lease_time : this_context->lease_time;
@@ -1141,17 +1177,38 @@ static int dhcp6_no_relay(int msg_type, struct in6_addr *link_address, struct dh
 	}
       
       o = new_opt6(opt_cfg->opt);
-      /* Maye be empty */
-      if (opt_cfg->val)
+      if (opt_cfg->flags & DHOPT_ADDR6)
+	{
+	  int j;
+	  struct in6_addr *a = (struct in6_addr *)opt_cfg->val;
+          for (j = 0; j < opt_cfg->len; j+=IN6ADDRSZ, a++)
+            {
+              /* zero means "self" (but not in vendorclass options.) */
+              if (IN6_IS_ADDR_UNSPECIFIED(a))
+                {
+		  if (IN6_IS_ADDR_UNSPECIFIED(&context->local6))
+		    put_opt6(fallback, IN6ADDRSZ);
+		  else
+		    put_opt6(&context->local6, IN6ADDRSZ);
+		}
+              else
+                put_opt6(a, IN6ADDRSZ);
+            }
+	}
+      else if (opt_cfg->val)
 	put_opt6(opt_cfg->val, opt_cfg->len);
       end_opt6(o);
-      
     }
   
-  if (!done_dns)
+  if (!done_dns && 
+      (!IN6_IS_ADDR_UNSPECIFIED(&context->local6) ||
+       !IN6_IS_ADDR_UNSPECIFIED(fallback)))
     {
       o = new_opt6(OPTION6_DNS_SERVER);
-      put_opt6(&context->local6, IN6ADDRSZ);
+      if (IN6_IS_ADDR_UNSPECIFIED(&context->local6))
+	put_opt6(fallback, IN6ADDRSZ);
+      else
+	put_opt6(&context->local6, IN6ADDRSZ);
       end_opt6(o); 
     }
    
@@ -1159,8 +1216,7 @@ static int dhcp6_no_relay(int msg_type, struct in6_addr *link_address, struct dh
        dhcp-option = vi-encap:13,17,....... */
   for (opt_cfg = daemon->dhcp_opts6; opt_cfg; opt_cfg = opt_cfg->next)
     opt_cfg->flags &= ~DHOPT_ENCAP_DONE;
-  
-  
+    
   if (oro)
     for (i = 0; i <  opt6_len(oro) - 1; i += 2)
       if (opt6_uint(oro, i, 2) == OPTION6_VENDOR_OPTS)
@@ -1213,18 +1269,6 @@ static int dhcp6_no_relay(int msg_type, struct in6_addr *link_address, struct dh
     }      
 
 
-  /* 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)
     {
       unsigned char *p;
@@ -1234,12 +1278,14 @@ static int dhcp6_no_relay(int msg_type, struct in6_addr *link_address, struct dh
 	len += strlen(send_domain) + 1;
 
       o = new_opt6(OPTION6_FQDN);
-      p = expand(len + 3);
-      *(p++) = fqdn_flags;
-      p = do_rfc1035_name(p, hostname);
-      if (send_domain)
-	p = do_rfc1035_name(p, send_domain);
-      *p = 0;
+      if ((p = expand(len + 3)))
+	{
+	  *(p++) = fqdn_flags;
+	  p = do_rfc1035_name(p, hostname);
+	  if (send_domain)
+	    p = do_rfc1035_name(p, send_domain);
+	  *p = 0;
+	}
       end_opt6(o);
     }
 
@@ -1310,19 +1356,19 @@ static void log6_packet(char *type, unsigned char *clid, int clid_len, struct in
     daemon->dhcp_buff2[0] = 0;
 
   if(option_bool(OPT_LOG_OPTS))
-    my_syslog(MS_DHCP | LOG_INFO, "%u %s(%s) %s %s%s",
+    my_syslog(MS_DHCP | LOG_INFO, "%u %s(%s) %s%s %s",
 	      xid, 
 	      type,
 	      iface, 
-	      daemon->namebuff,
 	      daemon->dhcp_buff2,
+	      daemon->namebuff,
 	      string ? string : "");
   else
-    my_syslog(MS_DHCP | LOG_INFO, "%s(%s) %s %s%s",
+    my_syslog(MS_DHCP | LOG_INFO, "%s(%s) %s%s %s",
 	      type,
 	      iface, 
-	      daemon->namebuff,
 	      daemon->dhcp_buff2,
+	      daemon->namebuff,
 	      string ? string : "");
 }
 
@@ -1382,80 +1428,4 @@ static unsigned int opt6_uint(unsigned char *opt, int offset, int size)
   return ret;
 } 
 
-static void end_opt6(int container)
-{
-   void *p = daemon->outpacket.iov_base + container + 2;
-   u16 len = outpacket_counter - container - 4 ;
-   
-   PUTSHORT(len, p);
-}
-
-static int save_counter(int newval)
-{
-  int ret = outpacket_counter;
-  if (newval != -1)
-    outpacket_counter = newval;
-
-  return ret;
-}
-
-static void *expand(size_t headroom)
-{
-  void *ret;
-
-  if (expand_buf(&daemon->outpacket, outpacket_counter + headroom))
-    {
-      ret = daemon->outpacket.iov_base + outpacket_counter;
-      outpacket_counter += headroom;
-      return ret;
-    }
-  
-  return NULL;
-}
-    
-static int new_opt6(int opt)
-{
-  int ret = outpacket_counter;
-  void *p;
-
-  if ((p = expand(4)))
-    {
-      PUTSHORT(opt, p);
-      PUTSHORT(0, p);
-    }
-
-  return ret;
-}
-
-static void *put_opt6(void *data, size_t len)
-{
-  void *p;
-
-  if ((p = expand(len)))
-    memcpy(p, data, len);   
-
-  return p;
-}
-  
-static void put_opt6_long(unsigned int val)
-{
-  void *p;
-  
-  if ((p = expand(4)))  
-    PUTLONG(val, p);
-}
-
-static void put_opt6_short(unsigned int val)
-{
-  void *p;
-
-  if ((p = expand(2)))
-    PUTSHORT(val, p);   
-}
-
-static void put_opt6_string(char *s)
-{
-  put_opt6(s, strlen(s));
-}
-
 #endif