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Hi!
I found some possible problem with the portability of the bits/in.h provided
by Glibc. The sysdeps/unix/sysv/linux/bits/in.h version has a number of
macros that aren't defined in sysdeps/generic/bits/in.h, and I suspect a
number of them are not really Linux-specific (Particularly, IPV6_PKTINFO
is defined on GNU/Linux and *BSD systems, and used unconditionaly by bind9)
Before I could dump cleanly the differences between both files, I had to do
some fixes in linux/bits/in.h because due to cosmetical changes they were
out of sync. I'm attaching a little patch (w/ChangeLog) that fixes this.
Once that is fixed, I could obtain a list of the actual differences between
both files. It follows in unified diff format.
If you could commit the attached patch, and have a look at the below macros
to give an indication on which of them are Linux-specific and which should
be added to generic/bits/in.h, that'd be much appreciated.
--- generic/bits/in.h 2003-06-28 10:25:50.000000000 +0200
+++ unix/sysv/linux/bits/in.h 2004-04-10 17:55:08.000000000 +0200
@@ -1,4 +1,4 @@
-/* Copyright (C) 1997, 2000 Free Software Foundation, Inc.
+/* Copyright (C) 1991-1999, 2000 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
@@ -16,34 +16,50 @@
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
-/* Generic version. */
+/* Linux version. */
#ifndef _NETINET_IN_H
# error "Never use <bits/in.h> directly; include <netinet/in.h> instead."
#endif
-/* Link numbers. */
-#define IMPLINK_IP 155
-#define IMPLINK_LOWEXPER 156
-#define IMPLINK_HIGHEXPER 158
-
-
/* Options for use with `getsockopt' and `setsockopt' at the IP level.
The first word in the comment at the right is the data type used;
"bool" means a boolean value stored in an `int'. */
-#define IP_OPTIONS 1 /* ip_opts; IP per-packet options. */
-#define IP_HDRINCL 2 /* int; Header is included with data. */
-#define IP_TOS 3 /* int; IP type of service and precedence. */
-#define IP_TTL 4 /* int; IP time to live. */
-#define IP_RECVOPTS 5 /* bool; Receive all IP options w/datagram. */
-#define IP_RECVRETOPTS 6 /* bool; Receive IP options for response. */
-#define IP_RECVDSTADDR 7 /* bool; Receive IP dst addr w/datagram. */
-#define IP_RETOPTS 8 /* ip_opts; Set/get IP per-packet options. */
-#define IP_MULTICAST_IF 9 /* in_addr; set/get IP multicast i/f */
-#define IP_MULTICAST_TTL 10 /* u_char; set/get IP multicast ttl */
-#define IP_MULTICAST_LOOP 11 /* i_char; set/get IP multicast loopback */
-#define IP_ADD_MEMBERSHIP 12 /* ip_mreq; add an IP group membership */
-#define IP_DROP_MEMBERSHIP 13 /* ip_mreq; drop an IP group membership */
+#define IP_OPTIONS 4 /* ip_opts; IP per-packet options. */
+#define IP_HDRINCL 3 /* int; Header is included with data. */
+#define IP_TOS 1 /* int; IP type of service and precedence. */
+#define IP_TTL 2 /* int; IP time to live. */
+#define IP_RECVOPTS 6 /* bool; Receive all IP options w/datagram. */
+/* For BSD compatibility. */
+#define IP_RECVRETOPTS IP_RETOPTS /* bool; Receive IP options for response. */
+#define IP_RETOPTS 7 /* ip_opts; Set/get IP per-packet options. */
+#define IP_MULTICAST_IF 32 /* in_addr; set/get IP multicast i/f */
+#define IP_MULTICAST_TTL 33 /* u_char; set/get IP multicast ttl */
+#define IP_MULTICAST_LOOP 34 /* i_char; set/get IP multicast loopback */
+#define IP_ADD_MEMBERSHIP 35 /* ip_mreq; add an IP group membership */
+#define IP_DROP_MEMBERSHIP 36 /* ip_mreq; drop an IP group membership */
+
+#define IP_ROUTER_ALERT 5 /* bool */
+#define IP_PKTINFO 8 /* bool */
+#define IP_PKTOPTIONS 9
+#define IP_PMTUDISC 10 /* obsolete name? */
+#define IP_MTU_DISCOVER 10 /* int; see below */
+#define IP_RECVERR 11 /* bool */
+#define IP_RECVTTL 12 /* bool */
+#define IP_RECVTOS 13 /* bool */
+
+
+/* IP_MTU_DISCOVER arguments. */
+#define IP_PMTUDISC_DONT 0 /* Never send DF frames. */
+#define IP_PMTUDISC_WANT 1 /* Use per route hints. */
+#define IP_PMTUDISC_DO 2 /* Always DF. */
+
+/* To select the IP level. */
+#define SOL_IP 0
+
+#define IP_DEFAULT_MULTICAST_TTL 1
+#define IP_DEFAULT_MULTICAST_LOOP 1
+#define IP_MAX_MEMBERSHIPS 20
/* Structure used to describe IP options for IP_OPTIONS and IP_RETOPTS.
The `ip_dst' field is used for the first-hop gateway when using a
@@ -61,9 +77,27 @@
struct in_addr imr_interface; /* local IP address of interface */
};
-/* IPV6 socket options. */
+/* As above but including interface specification by index. */
+struct ip_mreqn
+ {
+ struct in_addr imr_multiaddr; /* IP multicast address of group */
+ struct in_addr imr_address; /* local IP address of interface */
+ int imr_ifindex; /* Interface index */
+ };
+
+/* Structure used for IP_PKTINFO. */
+struct in_pktinfo
+ {
+ int ipi_ifindex; /* Interface index */
+ struct in_addr ipi_spec_dst; /* Routing destination address */
+ struct in_addr ipi_addr; /* Header destination address */
+ };
+
+/* Options for use with `getsockopt' and `setsockopt' at the IPv6 level.
+ The first word in the comment at the right is the data type used;
+ "bool" means a boolean value stored in an `int'. */
#define IPV6_ADDRFORM 1
-#define IPV6_RXINFO 2
+#define IPV6_PKTINFO 2
#define IPV6_HOPOPTS 3
#define IPV6_DSTOPTS 4
#define IPV6_RTHDR 5
@@ -71,16 +105,25 @@
#define IPV6_CHECKSUM 7
#define IPV6_HOPLIMIT 8
-#define IPV6_TXINFO IPV6_RXINFO
-#define SCM_SRCINFO IPV6_TXINFO
#define SCM_SRCRT IPV6_RXSRCRT
+#define IPV6_NEXTHOP 9
+#define IPV6_AUTHHDR 10
#define IPV6_UNICAST_HOPS 16
#define IPV6_MULTICAST_IF 17
#define IPV6_MULTICAST_HOPS 18
#define IPV6_MULTICAST_LOOP 19
#define IPV6_JOIN_GROUP 20
#define IPV6_LEAVE_GROUP 21
+#define IPV6_ROUTER_ALERT 22
+#define IPV6_MTU_DISCOVER 23
+#define IPV6_MTU 24
+#define IPV6_RECVERR 25
+#define IPV6_V6ONLY 26
+#define IPV6_JOIN_ANYCAST 27
+#define IPV6_LEAVE_ANYCAST 28
+#define IPV6_IPSEC_POLICY 34
+#define IPV6_XFRM_POLICY 35
/* Obsolete synonyms for the above. */
#define IPV6_ADD_MEMBERSHIP IPV6_JOIN_GROUP
@@ -88,6 +131,15 @@
#define IPV6_RXHOPOPTS IPV6_HOPOPTS
#define IPV6_RXDSTOPTS IPV6_DSTOPTS
+/* IPV6_MTU_DISCOVER values. */
+#define IPV6_PMTUDISC_DONT 0 /* Never send DF frames. */
+#define IPV6_PMTUDISC_WANT 1 /* Use per route hints. */
+#define IPV6_PMTUDISC_DO 2 /* Always DF. */
+
+/* Socket level values for IPv6. */
+#define SOL_IPV6 41
+#define SOL_ICMPV6 58
+
/* Routing header options for IPv6. */
#define IPV6_RTHDR_LOOSE 0 /* Hop doesn't need to be neighbour. */
#define IPV6_RTHDR_STRICT 1 /* Hop must be a neighbour. */
--
Robert Millan
"[..] but the delight and pride of Aule is in the deed of making, and in the
thing made, and neither in possession nor in his own mastery; wherefore he
gives and hoards not, and is free from care, passing ever on to some new work."
-- J.R.R.T., Ainulindale (Silmarillion)
Attachment:
bits_in.diff
Description: Text document
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