5 files changed, 94 insertions, 11 deletions
diff --git a/sysdeps/unix/sysv/linux/Dist b/sysdeps/unix/sysv/linux/Dist
index c5a2f179ee..b757562124 100644
--- a/sysdeps/unix/sysv/linux/Dist
+++ b/sysdeps/unix/sysv/linux/Dist
@@ -1,3 +1,4 @@
+cmsg_nxthdr.c
 init-first.h
 kernel_sigaction.h
 llseek.c
diff --git a/sysdeps/unix/sysv/linux/Makefile b/sysdeps/unix/sysv/linux/Makefile
index ae2e294785..e02ee8cfe4 100644
--- a/sysdeps/unix/sysv/linux/Makefile
+++ b/sysdeps/unix/sysv/linux/Makefile
@@ -35,6 +35,7 @@ endif
 ifeq ($(subdir),socket)
 sysdep_headers += sys/socketcall.h net/if.h net/if_ppp.h net/ppp-comp.h \
 		  net/ppp_defs.h net/if_arp.h net/route.h
+sysdep_routines += cmsg_nxthdr
 endif
 
 ifeq ($(subdir),sunrpc)
diff --git a/sysdeps/unix/sysv/linux/cmsg_nxthdr.c b/sysdeps/unix/sysv/linux/cmsg_nxthdr.c
new file mode 100644
index 0000000000..2245db7f25
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/cmsg_nxthdr.c
@@ -0,0 +1,38 @@
+/* Return point to next ancillary data entry in message header.
+   Copyright (C) 1997 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public License as
+   published by the Free Software Foundation; either version 2 of the
+   License, or (at your option) any later version.
+
+   The GNU C Library 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
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include <sys/socket.h>
+
+
+struct cmsghdr *
+__cmsg_nxthdr (struct msghdr *mhdr, struct cmsghdr *cmsg)
+{
+  unsigned char *p;
+
+  if ((size_t) cmsg->cmsg_len < sizeof (struct cmsghdr))
+    /* The kernel header does this so there may be a reason.  */
+    return NULL;
+
+  p = (((unsigned char *) cmsg)
+       + ((cmsg->cmsg_len + sizeof (long int) - 1) & ~sizeof (long int)));
+  if (p >= (unsigned char *) mhdr->msg_control + mhdr->msg_controllen)
+    /* No more entries.  */
+    return NULL;
+  return (struct cmsghdr *) p;
+}
diff --git a/sysdeps/unix/sysv/linux/netinet/in.h b/sysdeps/unix/sysv/linux/netinet/in.h
index c1df8250c0..0fec8ce3dd 100644
--- a/sysdeps/unix/sysv/linux/netinet/in.h
+++ b/sysdeps/unix/sysv/linux/netinet/in.h
@@ -27,17 +27,19 @@
 /* Standard well-defined IP protocols.  */
 enum
   {
-    IPPROTO_IP = 0,	/* Dummy protocol for TCP.  */
-    IPPROTO_ICMP = 1,	/* Internet Control Message Protocol.  */
-    IPPROTO_IGMP = 2,	/* Internet Group Management Protocol. */
-    IPPROTO_IPIP = 4,	/* IPIP tunnels (older KA9Q tunnels use 94).  */
-    IPPROTO_TCP = 6,	/* Transmission Control Protocol.  */
-    IPPROTO_EGP = 8,	/* Exterior Gateway Protocol.  */
-    IPPROTO_PUP = 12,	/* PUP protocol.  */
-    IPPROTO_UDP = 17,	/* User Datagram Protocol.  */
-    IPPROTO_IDP = 22,	/* XNS IDP protocol.  */
-
-    IPPROTO_RAW = 255,	/* Raw IP packets.  */
+    IPPROTO_IP = 0,	 /* Dummy protocol for TCP.  */
+    IPPROTO_ICMP = 1,	 /* Internet Control Message Protocol.  */
+    IPPROTO_IGMP = 2,	 /* Internet Group Management Protocol. */
+    IPPROTO_IPIP = 4,	 /* IPIP tunnels (older KA9Q tunnels use 94).  */
+    IPPROTO_TCP = 6,	 /* Transmission Control Protocol.  */
+    IPPROTO_EGP = 8,	 /* Exterior Gateway Protocol.  */
+    IPPROTO_PUP = 12,	 /* PUP protocol.  */
+    IPPROTO_UDP = 17,	 /* User Datagram Protocol.  */
+    IPPROTO_IDP = 22,	 /* XNS IDP protocol.  */
+    IPPROTO_IPV6 = 41,   /* IPv6-in-IPv4 tunnelling.  */
+    IPPROTO_ICMPV6 = 58, /* ICMPv6.  */
+
+    IPPROTO_RAW = 255,	 /* Raw IP packets.  */
     IPPROTO_MAX
   };
 
diff --git a/sysdeps/unix/sysv/linux/socketbits.h b/sysdeps/unix/sysv/linux/socketbits.h
index 1cf44b4347..91deb6c815 100644
--- a/sysdeps/unix/sysv/linux/socketbits.h
+++ b/sysdeps/unix/sysv/linux/socketbits.h
@@ -126,6 +126,47 @@ struct msghdr
     int msg_flags;		/* Flags on received message.  */
   };
 
+/* Structure used for storage of ancillary data object information.  */
+struct cmsghdr
+  {
+    int cmsg_len;		/* Length of data in cmsg_data plus length
+				   of cmsghdr structure.  */
+    /* XXX Should be type `size_t' according to POSIX.1g.  */
+    int cmsg_level;		/* Originating protocol.  */
+    int cmsg_type;		/* Protocol specific type.  */
+    unsigned char __cmsg_data[0]; /* Ancillary data.  */
+  };
+
+/* Ancillary data object manipulation macros.  */
+#define CMSG_DATA(cmsg) ((cmsg)->__cmsg_data)
+#define CMSG_NXTHDR(mhdr, cmsg) __cmsg_nxthdr (mhdr, cmsg)
+#define CMSG_FIRSTHDR(mhdr) (mhdr) \
+  ((size_t) (mhdr)->msg_controllen >= sizeof (struct cmsghdr)			      \
+   ? (struct cmsghdr *) (mhdr)->msg_control : (struct cmsghdr *) NULL)
+
+
+#ifndef _EXTERN_INLINE
+# define _EXTERN_INLINE extern __inline
+#endif
+extern struct cmsghdr *__cmsg_nxthdr __P ((struct msghdr *__mhdr,
+					   struct cmsghdr *__cmsg));
+_EXTERN_INLINE struct cmsghdr *
+__cmsg_nxthdr (struct msghdr *__mhdr, struct cmsghdr *__cmsg)
+{
+  unsigned char *__p;
+
+  if ((size_t) __cmsg->cmsg_len < sizeof (struct cmsghdr))
+    /* The kernel header does this so there may be a reason.  */
+    return NULL;
+
+  __p = (((unsigned char *) __cmsg)
+	 + ((__cmsg->cmsg_len + sizeof (long int) - 1) & ~sizeof (long int)));
+  if (__p >= (unsigned char *) __mhdr->msg_control + __mhdr->msg_controllen)
+    /* No more entries.  */
+    return NULL;
+  return (struct cmsghdr *) __p;
+}
+
 
 /* Get socket manipulation related informations from kernel headers.  */
 #include <asm/socket.h>