* sysdeps/posix/getaddrinfo.c (defaults_scopes, scopes): New variables.

(get_scope): For IPv4 scope, use scopes table.
	(fini): Free scopes table if necessary.
	(free_scopelist): New function.
	(scopecmp): New function.
	(gaiconf_init): Also handle scopev4 entries.
	* posix/tst-rfc3484.c (do_test): Initialize scopes.
	* posix/tst-rfc3484-2.c (do_test): Likewise.
	* posix/gai.conf: Document scopev4 defaults.
	* posix/Makefile (tests): Add tst-rfc3484-3.
	* posix/tst-rfc3484-3.c: New file.

ChangeLog

@@ -1,5 +1,17 @@
 2007-11-19  Ulrich Drepper  <drepper@redhat.com>
 
+	* sysdeps/posix/getaddrinfo.c (defaults_scopes, scopes): New variables.
+	(get_scope): For IPv4 scope, use scopes table.
+	(fini): Free scopes table if necessary.
+	(free_scopelist): New function.
+	(scopecmp): New function.
+	(gaiconf_init): Also handle scopev4 entries.
+	* posix/tst-rfc3484.c (do_test): Initialize scopes.
+	* posix/tst-rfc3484-2.c (do_test): Likewise.
+	* posix/gai.conf: Document scopev4 defaults.
+	* posix/Makefile (tests): Add tst-rfc3484-3.
+	* posix/tst-rfc3484-3.c: New file.
+
 	* sysdeps/posix/getaddrinfo.c (default_labels): Describe entry for
 	Teredo tunnels.
 	* posix/gai.conf: Update for current default tables.

posix/Makefile

@@ -90,6 +90,7 @@ tests		:= tstgetopt testfnm runtests runptests	     \
 		   tst-execv1 tst-execv2 tst-execl1 tst-execl2 \
 		   tst-execve1 tst-execve2 tst-execle1 tst-execle2 \
 		   tst-execvp3 tst-execvp4 tst-rfc3484 tst-rfc3484-2 \
+		   tst-rfc3484-3 \
 		   tst-getaddrinfo3 tst-fnmatch2 tst-cpucount tst-cpuset
 xtests		:= bug-ga2
 ifeq (yes,$(build-shared))

posix/gai.conf

@@ -52,3 +52,17 @@
 #    For sites which prefer IPv4 connections change the last line to
 #
 #precedence ::ffff:0:0/96  100
+
+#
+# scopev4  <mask>  <value>
+#    Add another rule to the RFC 3484 scope table for IPv4 addresses.
+#    By default the scope IDs described in section 3.2 in RFC 3484 are
+#    used.  Changing these defaults should hardly ever be necessary.
+#    The defaults are equivalent to:
+#
+#scopev4 ::ffff:169.254.0.0/112  2
+#scopev4 ::ffff:127.0.0.0/104    2
+#scopev4 ::ffff:10.0.0.0/104     5
+#scopev4 ::ffff:172.16.0.0/108   5
+#scopev4 ::ffff:192.168.0.0/112  5
+#scopev4 ::ffff:0.0.0.0          14

posix/tst-rfc3484-2.c

@@ -66,6 +66,7 @@ do_test (void)
 {
   labels = default_labels;
   precedence = default_precedence;
+  scopes = default_scopes;
 
   struct sockaddr_in so1;
   so1.sin_family = AF_INET;

posix/tst-rfc3484-3.c

@@ -0,0 +1,137 @@
+#include <stdbool.h>
+#include <stdio.h>
+#include <ifaddrs.h>
+
+/* Internal definitions used in the libc code.  */
+#define __getservbyname_r getservbyname_r
+#define __socket socket
+#define __getsockname getsockname
+#define __inet_aton inet_aton
+#define __gethostbyaddr_r gethostbyaddr_r
+#define __gethostbyname2_r gethostbyname2_r
+
+void
+attribute_hidden
+__check_pf (bool *p1, bool *p2, struct in6addrinfo **in6ai, size_t *in6ailen)
+{
+  *p1 = *p2 = true;
+  *in6ai = NULL;
+  *in6ailen = 0;
+}
+void
+attribute_hidden
+__check_native (uint32_t a1_index, int *a1_native,
+		uint32_t a2_index, int *a2_native)
+{
+}
+int
+__idna_to_ascii_lz (const char *input, char **output, int flags)
+{
+  return 0;
+}
+int
+__idna_to_unicode_lzlz (const char *input, char **output, int flags)
+{
+  *output = NULL;
+  return 0;
+}
+
+#include "../sysdeps/posix/getaddrinfo.c"
+
+service_user *__nss_hosts_database attribute_hidden;
+
+
+/* This is the beginning of the real test code.  The above defines
+   (among other things) the function rfc3484_sort.  */
+
+
+#if __BYTE_ORDER == __BIG_ENDIAN
+# define h(n) n
+#else
+# define h(n) __bswap_constant_32 (n)
+#endif
+
+struct sockaddr_in addrs[] =
+{
+  { .sin_family = AF_INET, .sin_addr = { h (0xa0a86d1d) } },
+  { .sin_family = AF_INET, .sin_addr = { h (0xa0a85d03) } },
+  { .sin_family = AF_INET, .sin_addr = { h (0xa0a82c3d) } },
+  { .sin_family = AF_INET, .sin_addr = { h (0xa0a86002) } },
+  { .sin_family = AF_INET, .sin_addr = { h (0xa0a802f3) } },
+  { .sin_family = AF_INET, .sin_addr = { h (0xa0a80810) } },
+  { .sin_family = AF_INET, .sin_addr = { h (0xa0a85e02) } },
+  { .sin_family = AF_INET, .sin_addr = { h (0xac162311) } },
+  { .sin_family = AF_INET, .sin_addr = { h (0x0a324572) } }
+};
+#define naddrs (sizeof (addrs) / sizeof (addrs[0]))
+static struct addrinfo ais[naddrs];
+static struct sort_result results[naddrs];
+
+static const int expected[naddrs] =
+  {
+    8, 0, 1, 2, 3, 4, 5, 6, 7
+  };
+
+static const struct scopeentry new_scopes[] =
+  {
+    { { { 169, 254, 0, 0 } }, h (0xffff0000), 2 },
+    { { { 127, 0, 0, 0 } }, h (0xff000000), 2 },
+    { { { 10, 0, 0, 0 } }, h (0xff000000), 5 },
+    { { { 192, 168, 0, 0 } }, h(0xffff0000), 5 },
+    { { { 0, 0, 0, 0 } }, h (0x00000000), 14 }
+  };
+
+
+ssize_t
+__getline (char **lineptr, size_t *n, FILE *s)
+{
+  *lineptr = NULL;
+  *n = 0;
+  return 0;
+}
+
+
+static int
+do_test (void)
+{
+  labels = default_labels;
+  precedence = default_precedence;
+  scopes= new_scopes;
+
+  struct sockaddr_in so;
+  so.sin_family = AF_INET;
+  so.sin_addr.s_addr = h (0x0aa85f19);
+
+  for (int i = 0; i < naddrs; ++i)
+    {
+      ais[i].ai_family = AF_INET;
+      ais[i].ai_addr = (struct sockaddr *) &addrs[i];
+      results[i].dest_addr = &ais[i];
+      results[i].got_source_addr = true;
+      memcpy(&results[i].source_addr, &so, sizeof (so));
+      results[i].source_addr_len = sizeof (so);
+      results[i].source_addr_flags = 0;
+      results[i].service_order = i;
+      results[i].prefixlen = 8;
+      results[i].index = 0;
+    }
+
+  struct sort_result_combo combo = { .results = results, .nresults = naddrs };
+  qsort_r (results, naddrs, sizeof (results[0]), rfc3484_sort, &combo);
+
+  int result = 0;
+  for (int i = 0; i < naddrs; ++i)
+    {
+      struct in_addr addr = ((struct sockaddr_in *) (results[i].dest_addr->ai_addr))->sin_addr;
+
+      int here = memcmp (&addr, &addrs[expected[i]].sin_addr,
+			 sizeof (struct in_addr));
+      printf ("[%d] = %s: %s\n", i, inet_ntoa (addr), here ? "FAIL" : "OK");
+      result |= here;
+    }
+
+  return result;
+}
+
+#define TEST_FUNCTION do_test ()
+#include "../test-skeleton.c"

posix/tst-rfc3484.c

@@ -85,6 +85,7 @@ do_test (void)
 {
   labels = default_labels;
   precedence = default_precedence;
+  scopes= default_scopes;
 
   struct sockaddr_in so;
   so.sin_family = AF_INET;

sysdeps/posix/getaddrinfo.c

@@ -1014,6 +1014,38 @@ struct sort_result_combo
 };
 
 
+#if __BYTE_ORDER == __BIG_ENDIAN
+# define htonl_c(n) n
+#else
+# define htonl_c(n) __bswap_constant_32 (n)
+#endif
+
+static const struct scopeentry
+{
+  union
+  {
+    char addr[4];
+    uint32_t addr32;
+  };
+  uint32_t netmask;
+  int32_t scope;
+} default_scopes[] =
+  {
+    /* Link-local addresses: scope 2.  */
+    { { { 169, 254, 0, 0 } }, htonl_c (0xffff0000), 2 },
+    { { { 127, 0, 0, 0 } }, htonl_c (0xff000000), 2 },
+    /* Site-local addresses: scope 5.  */
+    { { { 10, 0, 0, 0 } }, htonl_c (0xff000000), 5 },
+    { { { 172, 16, 0, 0 } }, htonl_c (0xfff00000), 5 },
+    { { { 192, 168, 0, 0 } }, htonl_c (0xffff0000), 5 },
+    /* Default: scope 14.  */
+    { { { 0, 0, 0, 0 } }, htonl_c (0x00000000), 14 }
+  };
+
+/* The label table.  */
+static const struct scopeentry *scopes;
+
+
 static int
 get_scope (const struct sockaddr_storage *ss)
 {
@@ -1038,17 +1070,17 @@ get_scope (const struct sockaddr_storage *ss)
   else if (ss->ss_family == PF_INET)
     {
       const struct sockaddr_in *in = (const struct sockaddr_in *) ss;
-      const uint8_t *addr = (const uint8_t *) &in->sin_addr;
 
-      /* RFC 3484 specifies how to map IPv6 addresses to scopes.
+      size_t cnt = 0;
-	 169.254/16 and 127/8 are link-local.  */
+      while (1)
-      if ((addr[0] == 169 && addr[1] == 254) || addr[0] == 127)
+	{
-	scope = 2;
+	  if ((in->sin_addr.s_addr & scopes[cnt].netmask)
-      else if (addr[0] == 10 || (addr[0] == 172 && (addr[1] & 0xf0) == 16)
+	      == scopes[cnt].addr32)
-	       || (addr[0] == 192 && addr[1] == 168))
+	    return scopes[cnt].scope;
-	scope = 5;
+
-      else
+	  ++cnt;
-	scope = 14;
+	}
+      /* NOTREACHED */
     }
   else
     /* XXX What is a good default?  */
@@ -1490,6 +1522,13 @@ libc_freeres_fn(fini)
       precedence = default_precedence;
       free ((void *) old);
     }
+
+  if (scopes != default_scopes)
+    {
+      const struct scopeentry *old = scopes;
+      scopes = default_scopes;
+      free ((void *) old);
+    }
 }
 
 
@@ -1500,6 +1539,13 @@ struct prefixlist
 };
 
 
+struct scopelist
+{
+  struct scopeentry entry;
+  struct scopelist *next;
+};
+
+
 static void
 free_prefixlist (struct prefixlist *list)
 {
@@ -1512,6 +1558,18 @@ free_prefixlist (struct prefixlist *list)
 }
 
 
+static void
+free_scopelist (struct scopelist *list)
+{
+  while (list != NULL)
+    {
+      struct scopelist *oldp = list;
+      list = list->next;
+      free (oldp);
+    }
+}
+
+
 static int
 prefixcmp (const void *p1, const void *p2)
 {
@@ -1526,6 +1584,20 @@ prefixcmp (const void *p1, const void *p2)
 }
 
 
+static int
+scopecmp (const void *p1, const void *p2)
+{
+  const struct scopeentry *e1 = (const struct scopeentry *) p1;
+  const struct scopeentry *e2 = (const struct scopeentry *) p2;
+
+  if (e1->netmask > e2->netmask)
+    return -1;
+  if (e1->netmask == e2->netmask)
+    return 0;
+  return 1;
+}
+
+
 static void
 gaiconf_init (void)
 {
@@ -1535,6 +1607,9 @@ gaiconf_init (void)
   struct prefixlist *precedencelist = NULL;
   size_t nprecedencelist = 0;
   bool precedencelist_nullbits = false;
+  struct scopelist *scopelist =  NULL;
+  size_t nscopelist = 0;
+  bool scopelist_nullbits = false;
 
   FILE *fp = fopen (GAICONF_FNAME, "rc");
   if (fp != NULL)
@@ -1625,7 +1700,7 @@ gaiconf_init (void)
 			  || (bits = strtoul (cp, &endp, 10)) != ULONG_MAX
 			  || errno != ERANGE)
 		      && *endp == '\0'
-		      && bits <= INT_MAX
+		      && bits <= 128
 		      && ((val = strtoul (val2, &endp, 10)) != ULONG_MAX
 			  || errno != ERANGE)
 		      && *endp == '\0'
@@ -1659,6 +1734,73 @@ gaiconf_init (void)
 		}
 	      break;
 
+	    case 7:
+	      if (strcmp (cmd, "scopev4") == 0)
+		{
+		  struct in6_addr prefix;
+		  unsigned long int bits;
+		  unsigned long int val;
+		  char *endp;
+
+		  bits = 32;
+		  __set_errno (0);
+		  cp = strchr (val1, '/');
+		  if (cp != NULL)
+		    *cp++ = '\0';
+		  if (inet_pton (AF_INET6, val1, &prefix))
+		    {
+		      if (IN6_IS_ADDR_V4MAPPED (&prefix)
+			  && (cp == NULL
+			      || (bits = strtoul (cp, &endp, 10)) != ULONG_MAX
+			      || errno != ERANGE)
+			  && *endp == '\0'
+			  && bits >= 96
+			  && bits <= 128
+			  && ((val = strtoul (val2, &endp, 10)) != ULONG_MAX
+			      || errno != ERANGE)
+			  && *endp == '\0'
+			  && val <= INT_MAX)
+			{
+			  struct scopelist *newp;
+			new_scope:
+			  newp = malloc (sizeof (*newp));
+			  if (newp == NULL)
+			    {
+			      free (line);
+			      fclose (fp);
+			      goto no_file;
+			    }
+
+			  newp->entry.netmask = htonl (bits != 96
+						       ? (0xffffffff
+							  << (128 - bits))
+						       : 0);
+			  newp->entry.addr32 = (prefix.s6_addr32[3]
+						& newp->entry.netmask);
+			  newp->entry.scope = val;
+			  newp->next = scopelist;
+			  scopelist = newp;
+			  ++nscopelist;
+			  scopelist_nullbits |= bits == 96;
+			}
+		    }
+		  else if (inet_pton (AF_INET, val1, &prefix.s6_addr32[3])
+			   && (cp == NULL
+			       || (bits = strtoul (cp, &endp, 10)) != ULONG_MAX
+			       || errno != ERANGE)
+			   && *endp == '\0'
+			   && bits <= 32
+			   && ((val = strtoul (val2, &endp, 10)) != ULONG_MAX
+			       || errno != ERANGE)
+			   && *endp == '\0'
+			   && val <= INT_MAX)
+		    {
+		      bits += 96;
+		      goto new_scope;
+		    }
+		}
+	      break;
+
 	    case 10:
 	      if (strcmp (cmd, "precedence") == 0)
 		{
@@ -1742,12 +1884,52 @@ gaiconf_init (void)
 
 	  /* Sort the entries so that the most specific ones are at
 	     the beginning.  */
-	  qsort (new_precedence, nprecedencelist, sizeof (*new_labels),
+	  qsort (new_precedence, nprecedencelist, sizeof (*new_precedence),
 		 prefixcmp);
 	}
       else
 	new_precedence = (struct prefixentry *) default_precedence;
 
+      struct scopeentry *new_scopes;
+      if (nscopelist > 0)
+	{
+	  if (!scopelist_nullbits)
+	    ++nscopelist;
+	  new_scopes = malloc (nscopelist * sizeof (*new_scopes));
+	  if (new_scopes == NULL)
+	    {
+	      if (new_labels != default_labels)
+		free (new_labels);
+	      if (new_precedence != default_precedence)
+		free (new_precedence);
+	      goto no_file;
+	    }
+
+	  int i = nscopelist;
+	  if (!scopelist_nullbits)
+	    {
+	      --i;
+	      new_scopes[i].addr32 = 0;
+	      new_scopes[i].netmask = 0;
+	      new_scopes[i].scope = 14;
+	    }
+
+	  struct scopelist *l = scopelist;
+	  while (i-- > 0)
+	    {
+	      new_scopes[i] = l->entry;
+	      l = l->next;
+	    }
+	  free_scopelist (scopelist);
+
+	  /* Sort the entries so that the most specific ones are at
+	     the beginning.  */
+	  qsort (new_scopes, nscopelist, sizeof (*new_scopes),
+		 scopecmp);
+	}
+      else
+	new_scopes = (struct scopeentry *) default_scopes;
+
       /* Now we are ready to replace the values.  */
       const struct prefixentry *old = labels;
       labels = new_labels;
@@ -1759,6 +1941,11 @@ gaiconf_init (void)
       if (old != default_precedence)
 	free ((void *) old);
 
+      const struct scopeentry *oldscope = scopes;
+      scopes = new_scopes;
+      if (oldscope != default_scopes)
+	free ((void *) oldscope);
+
       gaiconf_mtime = st.st_mtim;
     }
   else
@@ -1766,6 +1953,7 @@ gaiconf_init (void)
     no_file:
       free_prefixlist (labellist);
       free_prefixlist (precedencelist);
+      free_scopelist (scopelist);
 
       /* If we previously read the file but it is gone now, free the
 	 old data and use the builtin one.  Leave the reload flag