298 lines
9.0 KiB
C
298 lines
9.0 KiB
C
|
/* ipvers.h - definitions for IPv4 and IPv6
|
||
|
|
|
||
|
|
Copyright (C) 2000, 2001 Thomas Moestl
|
||
|
|
Copyright (C) 2003, 2007, 2009 Paul A. Rombouts
|
||
|
|
|
||
|
|
This file is part of the pdnsd package.
|
||
|
|
|
||
|
|
pdnsd 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; either version 3 of the License, or
|
||
|
|
(at your option) any later version.
|
||
|
|
|
||
|
|
pdnsd 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 pdnsd; see the file COPYING. If not, see
|
||
|
|
<http://www.gnu.org/licenses/>.
|
||
|
|
*/
|
||
|
|
|
||
|
|
|
||
|
|
#ifndef IPVERS_H
|
||
|
|
#define IPVERS_H
|
||
|
|
|
||
|
|
#include <config.h>
|
||
|
|
#include <sys/types.h>
|
||
|
|
#include <sys/socket.h>
|
||
|
|
#include <netinet/in.h>
|
||
|
|
#include <arpa/inet.h>
|
||
|
|
#include "rr_types.h"
|
||
|
|
|
||
|
|
#if defined(ENABLE_IPV4) && !defined(ENABLE_IPV6)
|
||
|
|
# ifdef DEFAULT_IPV4
|
||
|
|
# undef DEFAULT_IPV4
|
||
|
|
# endif
|
||
|
|
# define DEFAULT_IPV4 1
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#if !defined(ENABLE_IPV4) && defined(ENABLE_IPV6)
|
||
|
|
# ifdef DEFAULT_IPV4
|
||
|
|
# undef DEFAULT_IPV4
|
||
|
|
# endif
|
||
|
|
# define DEFAULT_IPV4 0
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#if defined(ENABLE_IPV4) && defined(ENABLE_IPV6)
|
||
|
|
# define ELSE_IPV6 else
|
||
|
|
#else
|
||
|
|
# define ELSE_IPV6
|
||
|
|
#endif
|
||
|
|
|
||
|
|
/* From main.c */
|
||
|
|
#ifdef ENABLE_IPV4
|
||
|
|
# ifdef ENABLE_IPV6
|
||
|
|
extern short int run_ipv4;
|
||
|
|
extern short int cmdlineipv;
|
||
|
|
# define SEL_IPVER(a4,a6) (run_ipv4? a4: a6)
|
||
|
|
# else
|
||
|
|
# define run_ipv4 1
|
||
|
|
# define SEL_IPVER(a4,a6) (a4)
|
||
|
|
# endif
|
||
|
|
#else
|
||
|
|
# define run_ipv4 0
|
||
|
|
# define SEL_IPVER(a4,a6) (a6)
|
||
|
|
#endif
|
||
|
|
#ifdef ENABLE_IPV6
|
||
|
|
#define DEFAULT_IPV4_6_PREFIX "::ffff:0.0.0.0"
|
||
|
|
/* extern short int cmdlineprefix; */
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#if (TARGET==TARGET_LINUX) && !defined(HAVE_STRUCT_IN_PKTINFO)
|
||
|
|
struct in_pktinfo
|
||
|
|
{
|
||
|
|
int ipi_ifindex;
|
||
|
|
struct in_addr ipi_spec_dst;
|
||
|
|
struct in_addr ipi_addr;
|
||
|
|
};
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#if (TARGET==TARGET_LINUX)
|
||
|
|
/* some older glibc versions seem to lack this. */
|
||
|
|
# ifndef IP_PKTINFO
|
||
|
|
# define IP_PKTINFO 8
|
||
|
|
# endif
|
||
|
|
# ifndef CMSG_LEN
|
||
|
|
/* ---- from glibc 2.1.2 */
|
||
|
|
|
||
|
|
/* Ancillary data object manipulation macros. */
|
||
|
|
# if !defined __STRICT_ANSI__ && defined __GNUC__ && __GNUC__ >= 2
|
||
|
|
# define CMSG_DATA(cmsg) ((cmsg)->__cmsg_data)
|
||
|
|
# else
|
||
|
|
# define CMSG_DATA(cmsg) ((unsigned char *) ((struct cmsghdr *) (cmsg) + 1))
|
||
|
|
# endif
|
||
|
|
# define CMSG_NXTHDR(mhdr, cmsg) __cmsg_nxthdr (mhdr, cmsg)
|
||
|
|
# define CMSG_FIRSTHDR(mhdr) \
|
||
|
|
((size_t) (mhdr)->msg_controllen >= sizeof (struct cmsghdr) \
|
||
|
|
? (struct cmsghdr *) (mhdr)->msg_control : (struct cmsghdr *) NULL)
|
||
|
|
# define CMSG_ALIGN(len) (((len) + sizeof (size_t) - 1) \
|
||
|
|
& ~(sizeof (size_t) - 1))
|
||
|
|
# define CMSG_SPACE(len) (CMSG_ALIGN (len) \
|
||
|
|
+ CMSG_ALIGN (sizeof (struct cmsghdr)))
|
||
|
|
# define CMSG_LEN(len) (CMSG_ALIGN (sizeof (struct cmsghdr)) + (len))
|
||
|
|
extern struct cmsghdr *__cmsg_nxthdr __P ((struct msghdr *__mhdr,
|
||
|
|
struct cmsghdr *__cmsg));
|
||
|
|
# ifdef __USE_EXTERN_INLINES
|
||
|
|
# ifndef _EXTERN_INLINE
|
||
|
|
# define _EXTERN_INLINE extern __inline
|
||
|
|
# endif
|
||
|
|
_EXTERN_INLINE struct cmsghdr *
|
||
|
|
__cmsg_nxthdr (struct msghdr *__mhdr, struct cmsghdr *__cmsg) __THROW
|
||
|
|
{
|
||
|
|
if ((size_t) __cmsg->cmsg_len < sizeof (struct cmsghdr))
|
||
|
|
/* The kernel header does this so there may be a reason. */
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
__cmsg = (struct cmsghdr *) ((unsigned char *) __cmsg
|
||
|
|
+ CMSG_ALIGN (__cmsg->cmsg_len));
|
||
|
|
if ((unsigned char *) (__cmsg + 1) >= ((unsigned char *) __mhdr->msg_control
|
||
|
|
+ __mhdr->msg_controllen)
|
||
|
|
|| ((unsigned char *) __cmsg + CMSG_ALIGN (__cmsg->cmsg_len)
|
||
|
|
>= ((unsigned char *) __mhdr->msg_control + __mhdr->msg_controllen)))
|
||
|
|
/* No more entries. */
|
||
|
|
return 0;
|
||
|
|
return __cmsg;
|
||
|
|
}
|
||
|
|
# endif /* Use `extern inline'. */
|
||
|
|
/* ---- */
|
||
|
|
# endif
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#if defined(ENABLE_IPV4) && !defined(SIN_LEN) && (TARGET==TARGET_BSD)
|
||
|
|
# define SIN_LEN
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#if defined(ENABLE_IPV6) && (TARGET==TARGET_LINUX)
|
||
|
|
|
||
|
|
/* Some glibc versions (I know of 2.1.2) get this wrong, so we define our own. To be exact, this is fixed
|
||
|
|
* glibc code. */
|
||
|
|
#ifdef IN6_ARE_ADDR_EQUAL
|
||
|
|
# undef IN6_ARE_ADDR_EQUAL
|
||
|
|
#endif
|
||
|
|
#define IN6_ARE_ADDR_EQUAL(a,b) \
|
||
|
|
((((uint32_t *) (a))[0] == ((uint32_t *) (b))[0]) && \
|
||
|
|
(((uint32_t *) (a))[1] == ((uint32_t *) (b))[1]) && \
|
||
|
|
(((uint32_t *) (a))[2] == ((uint32_t *) (b))[2]) && \
|
||
|
|
(((uint32_t *) (a))[3] == ((uint32_t *) (b))[3]))
|
||
|
|
|
||
|
|
#endif
|
||
|
|
|
||
|
|
/* This is the IPv6 flowid that we pass on to the IPv6 protocol stack. This value was not currently defined
|
||
|
|
* at the time of writing. Should this change, define a appropriate flowinfo here. */
|
||
|
|
#ifndef IPV6_FLOWINFO
|
||
|
|
#define IPV6_FLOWINFO 0
|
||
|
|
#endif
|
||
|
|
|
||
|
|
/* There does not seem to be a function/macro to generate IPv6-mapped IPv4-Adresses. So here comes mine.
|
||
|
|
* Pass an in_addr* and an in6_addr* */
|
||
|
|
#define IPV6_MAPIPV4(a,b) {((uint32_t *)(b))[3]=(a)->s_addr; \
|
||
|
|
((uint32_t *)(b))[2]=htonl(0xffff); \
|
||
|
|
((uint32_t *)(b))[1]=((uint32_t *)(b))[0]=0; }
|
||
|
|
|
||
|
|
/* A macro to extract the pointer to the address of a struct sockaddr (_in or _in6) */
|
||
|
|
|
||
|
|
#define SOCKA_A4(a) ((pdnsd_a *)&((struct sockaddr_in *)(a))->sin_addr)
|
||
|
|
#define SOCKA_A6(a) ((pdnsd_a *)&((struct sockaddr_in6 *)(a))->sin6_addr)
|
||
|
|
|
||
|
|
#define SOCKA_A(a) SEL_IPVER(SOCKA_A4(a),SOCKA_A6(a))
|
||
|
|
#define PDNSD_PF_INET SEL_IPVER(PF_INET,PF_INET6)
|
||
|
|
#define PDNSD_AF_INET SEL_IPVER(AF_INET,AF_INET6)
|
||
|
|
|
||
|
|
/* This is to compare two addresses. This is a macro because it may change due to the more complex IPv6 adressing architecture
|
||
|
|
* (there are, for example, two equivalent addresses of the loopback device)
|
||
|
|
* Pass this two addresses as in_addr or in6_addr. pdnsd_a is ok (it is a union) */
|
||
|
|
|
||
|
|
#define ADDR_EQUIV4(a,b) (((struct in_addr *)(a))->s_addr==((struct in_addr *)(b))->s_addr)
|
||
|
|
#define ADDR_EQUIV6(a,b) IN6_ARE_ADDR_EQUAL(((struct in6_addr *)(a)),((struct in6_addr *)(b)))
|
||
|
|
|
||
|
|
#define ADDR_EQUIV(a,b) SEL_IPVER(ADDR_EQUIV4(a,b), ADDR_EQUIV6(a,b))
|
||
|
|
|
||
|
|
/* Compare an IPv6 adress with an IPv4 one. b should have type struct in_addr*.
|
||
|
|
Note the similarity with the IPV6_MAPIPV4 macro. */
|
||
|
|
#define ADDR_EQUIV6_4(a,b) (((uint32_t *)(a))[3]==(b)->s_addr && \
|
||
|
|
((uint32_t *)(a))[2]==htonl(0xffff) && \
|
||
|
|
((uint32_t *)(a))[1]==0 && \
|
||
|
|
((uint32_t *)(a))[0]==0)
|
||
|
|
|
||
|
|
/* Compare two address a and b in combination with a netmask m.
|
||
|
|
Only the bits coresponding to those set in the netmask are matched, the rest are ignored.
|
||
|
|
Pass in_addr* or in6_addr* arguments, respectively. */
|
||
|
|
#define ADDR4MASK_EQUIV(a,b,m) ((((a)->s_addr^(b)->s_addr)&(m)->s_addr)==0)
|
||
|
|
#define ADDR6MASK_EQUIV(a,b,m) (((((uint32_t *)(a))[0]^((uint32_t *)(b))[0])&((uint32_t *)(m))[0])==0 && \
|
||
|
|
((((uint32_t *)(a))[1]^((uint32_t *)(b))[1])&((uint32_t *)(m))[1])==0 && \
|
||
|
|
((((uint32_t *)(a))[2]^((uint32_t *)(b))[2])&((uint32_t *)(m))[2])==0 && \
|
||
|
|
((((uint32_t *)(a))[3]^((uint32_t *)(b))[3])&((uint32_t *)(m))[3])==0)
|
||
|
|
|
||
|
|
/* See if we need 4.4BSD style sockaddr_* structures and define some macros that set the length field.
|
||
|
|
* The non-4.4BSD behaviour is the only one that is POSIX-conformant.*/
|
||
|
|
#if defined(SIN6_LEN) || defined(SIN_LEN)
|
||
|
|
# define BSD44_SOCKA
|
||
|
|
# define SET_SOCKA_LEN4(socka) (socka.sin_len=sizeof(struct sockaddr_in))
|
||
|
|
# define SET_SOCKA_LEN6(socka) (socka.sin6_len=sizeof(struct sockaddr_in6))
|
||
|
|
#else
|
||
|
|
# define SET_SOCKA_LEN4(socka)
|
||
|
|
# define SET_SOCKA_LEN6(socka)
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#ifdef ENABLE_IPV6
|
||
|
|
# define ADDRSTR_MAXLEN INET6_ADDRSTRLEN
|
||
|
|
#else
|
||
|
|
# ifdef INET_ADDRSTRLEN
|
||
|
|
# define ADDRSTR_MAXLEN INET_ADDRSTRLEN
|
||
|
|
# else
|
||
|
|
# define ADDRSTR_MAXLEN 16
|
||
|
|
# endif
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#if (TARGET==TARGET_BSD) || (TARGET==TARGET_CYGWIN)
|
||
|
|
# define SOL_IPV6 IPPROTO_IPV6
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#ifdef ENABLE_IPV6
|
||
|
|
# ifndef IPV6_RECVPKTINFO
|
||
|
|
/* This appears to be needed e.g. on Darwin (Mac OS X). */
|
||
|
|
# define IPV6_RECVPKTINFO IPV6_PKTINFO
|
||
|
|
# endif
|
||
|
|
#endif
|
||
|
|
|
||
|
|
typedef union {
|
||
|
|
#ifdef ENABLE_IPV4
|
||
|
|
struct in_addr ipv4;
|
||
|
|
#endif
|
||
|
|
#ifdef ENABLE_IPV6
|
||
|
|
struct in6_addr ipv6;
|
||
|
|
#endif
|
||
|
|
} pdnsd_a;
|
||
|
|
|
||
|
|
#ifdef ENABLE_IPV4
|
||
|
|
#define PDNSD_A_INITIALIZER {{INADDR_ANY}}
|
||
|
|
#else
|
||
|
|
#define PDNSD_A_INITIALIZER {IN6ADDR_ANY_INIT}
|
||
|
|
#endif
|
||
|
|
|
||
|
|
|
||
|
|
/* The pdnsd_a2 type is very similar to pdnsd_a, but can hold
|
||
|
|
both an IPv4 and an IPv6 address at the same time,
|
||
|
|
i.e. a struct instead of a union.
|
||
|
|
*/
|
||
|
|
typedef struct {
|
||
|
|
#ifdef ENABLE_IPV6
|
||
|
|
struct in6_addr ipv6;
|
||
|
|
#endif
|
||
|
|
struct in_addr ipv4;
|
||
|
|
} pdnsd_a2;
|
||
|
|
|
||
|
|
/* Macros/functions for assigning/converting a pdnsd_a* to a pdnsd_a2* type,
|
||
|
|
and vice versa.
|
||
|
|
*/
|
||
|
|
#ifdef ENABLE_IPV6
|
||
|
|
inline static void SET_PDNSD_A2(pdnsd_a2 *a2, pdnsd_a *a) __attribute__((always_inline));
|
||
|
|
inline static void SET_PDNSD_A2(pdnsd_a2 *a2, pdnsd_a *a)
|
||
|
|
{
|
||
|
|
#ifdef ENABLE_IPV4
|
||
|
|
if(run_ipv4)
|
||
|
|
a2->ipv4=a->ipv4;
|
||
|
|
else
|
||
|
|
#endif
|
||
|
|
{
|
||
|
|
a2->ipv6=a->ipv6;
|
||
|
|
a2->ipv4.s_addr=INADDR_ANY;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
#else
|
||
|
|
# define SET_PDNSD_A2(a2,a) ((a2)->ipv4=(a)->ipv4)
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#define PDNSD_A2_TO_A(a2) SEL_IPVER(((pdnsd_a *)&(a2)->ipv4),((pdnsd_a *)&(a2)->ipv6))
|
||
|
|
|
||
|
|
/* Do we have sufficient support in the C libraries to allow local AAAA records
|
||
|
|
to be defined? */
|
||
|
|
#if defined(HAVE_STRUCT_IN6_ADDR) && defined(HAVE_INET_PTON)
|
||
|
|
# define ALLOW_LOCAL_AAAA IS_CACHED_AAAA
|
||
|
|
#else
|
||
|
|
# define ALLOW_LOCAL_AAAA 0
|
||
|
|
#endif
|
||
|
|
|
||
|
|
/* Used to enter local records */
|
||
|
|
typedef union {
|
||
|
|
struct in_addr ipv4;
|
||
|
|
#if ALLOW_LOCAL_AAAA
|
||
|
|
struct in6_addr ipv6;
|
||
|
|
#endif
|
||
|
|
} pdnsd_ca;
|
||
|
|
|
||
|
|
|
||
|
|
#endif
|