ipv6.h - platform/external/dhcpcd-6.8.2 - Git at Google

 /*
  * dhcpcd - DHCP client daemon
  * Copyright (c) 2006-2015 Roy Marples <roy@marples.name>
  * All rights reserved

  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  */

 #ifndef IPV6_H
 #define IPV6_H

 #include <sys/uio.h>
 #include <netinet/in.h>

 #include "config.h"
 #include "dhcpcd.h"

 #define ALLROUTERS "ff02::2"

 #define ROUNDUP8(a)  (1 + (((a) - 1) |  7))
 #define ROUNDUP16(a) (1 + (((a) - 1) | 16))

 #define EUI64_GBIT		0x01
 #define EUI64_UBIT		0x02
 #define EUI64_TO_IFID(in6)	do {(in6)->s6_addr[8] ^= EUI64_UBIT; } while (0)
 #define EUI64_GROUP(in6)	((in6)->s6_addr[8] & EUI64_GBIT)

 #ifndef ND6_INFINITE_LIFETIME
 #  define ND6_INFINITE_LIFETIME		((uint32_t)~0)
 #endif

 /* RFC4941 constants */
 #define TEMP_VALID_LIFETIME	604800	/* 1 week */
 #define TEMP_PREFERRED_LIFETIME	86400	/* 1 day */
 #define REGEN_ADVANCE		5	/* seconds */
 #define MAX_DESYNC_FACTOR	600	/* 10 minutes */

 #define TEMP_IDGEN_RETRIES	3
 #define GEN_TEMPID_RETRY_MAX	5

 /* RFC7217 constants */
 #define IDGEN_RETRIES	3
 #define IDGEN_DELAY	1 /* second */

 /*
  * BSD kernels don't inform userland of DAD results.
  * See the discussion here:
  *    http://mail-index.netbsd.org/tech-net/2013/03/15/msg004019.html
  */
 #ifndef __linux__
 /* We guard here to avoid breaking a compile on linux ppc-64 headers */
 #  include <sys/param.h>
 #endif
 #ifdef BSD
 #  define IPV6_POLLADDRFLAG
 #endif

 /* This was fixed in NetBSD */
 #if defined(__NetBSD_Version__) && __NetBSD_Version__ >= 699002000
 #  undef IPV6_POLLADDRFLAG
 #endif

 /* Linux-3.18 can manage temporary addresses even with RA
  * processing disabled. */
 //#undef IFA_F_MANAGETEMPADDR
 #if defined(__linux__) && defined(IFA_F_MANAGETEMPADDR)
 #define IPV6_MANAGETEMPADDR
 #endif

 /* Some BSDs do not allow userland to set temporary addresses. */
 #if defined(BSD) && defined(IN6_IFF_TEMPORARY)
 #define IPV6_MANAGETEMPADDR
 #endif

 struct ipv6_addr {
 	TAILQ_ENTRY(ipv6_addr) next;
 	struct interface *iface;
 	struct in6_addr prefix;
 	uint8_t prefix_len;
 	uint32_t prefix_vltime;
 	uint32_t prefix_pltime;
 	struct timespec created;
 	struct timespec acquired;
 	struct in6_addr addr;
 	int addr_flags;
 	short flags;
 	char saddr[INET6_ADDRSTRLEN];
 	uint8_t iaid[4];
 	uint16_t ia_type;
 	struct interface *delegating_iface;
 	uint8_t prefix_exclude_len;
 	struct in6_addr prefix_exclude;

 	void (*dadcallback)(void *);
 	int dadcounter;
 	uint8_t *ns;
 	size_t nslen;
 	int nsprobes;
 };
 TAILQ_HEAD(ipv6_addrhead, ipv6_addr);

 #define IPV6_AF_ONLINK		0x0001
 #define	IPV6_AF_NEW		0x0002
 #define IPV6_AF_STALE		0x0004
 #define IPV6_AF_ADDED		0x0008
 #define IPV6_AF_AUTOCONF	0x0010
 #define IPV6_AF_DUPLICATED	0x0020
 #define IPV6_AF_DADCOMPLETED	0x0040
 #define IPV6_AF_DELEGATED	0x0080
 #define IPV6_AF_DELEGATEDPFX	0x0100
 #define IPV6_AF_DELEGATEDZERO	0x0200
 #define IPV6_AF_REQUEST		0x0400
 #ifdef IPV6_MANAGETEMPADDR
 #define IPV6_AF_TEMPORARY	0X0800
 #endif

 struct rt6 {
 	TAILQ_ENTRY(rt6) next;
 	struct in6_addr dest;
 	struct in6_addr net;
 	struct in6_addr gate;
 	const struct interface *iface;
 	unsigned int flags;
 #ifdef HAVE_ROUTE_METRIC
 	unsigned int metric;
 #endif
 	unsigned int mtu;
 };
 TAILQ_HEAD(rt6_head, rt6);

 struct ll_callback {
 	TAILQ_ENTRY(ll_callback) next;
 	void (*callback)(void *);
 	void *arg;
 };
 TAILQ_HEAD(ll_callback_head, ll_callback);

 struct ipv6_state {
 	struct ipv6_addrhead addrs;
 	struct ll_callback_head ll_callbacks;

 #ifdef IPV6_MANAGETEMPADDR
 	time_t desync_factor;
 	uint8_t randomseed0[8]; /* upper 64 bits of MD5 digest */
 	uint8_t randomseed1[8]; /* lower 64 bits */
 	uint8_t randomid[8];
 #endif
 };

 #define IPV6_STATE(ifp)							       \
 	((struct ipv6_state *)(ifp)->if_data[IF_DATA_IPV6])
 #define IPV6_CSTATE(ifp)						       \
 	((const struct ipv6_state *)(ifp)->if_data[IF_DATA_IPV6])

 /* dhcpcd requires CMSG_SPACE to evaluate to a compile time constant. */
 #ifdef __QNX__
 #undef CMSG_SPACE
 #endif

 #ifndef ALIGNBYTES
 #define ALIGNBYTES (sizeof(int) - 1)
 #endif
 #ifndef ALIGN
 #define	ALIGN(p) (((unsigned int)(p) + ALIGNBYTES) & ~ALIGNBYTES)
 #endif
 #ifndef CMSG_SPACE
 #define	CMSG_SPACE(len)	(ALIGN(sizeof(struct cmsghdr)) + ALIGN(len))
 #endif

 #define IP6BUFLEN	(CMSG_SPACE(sizeof(struct in6_pktinfo)) + \
 			CMSG_SPACE(sizeof(int)))


 #ifdef INET6
 struct ipv6_ctx {
 	struct sockaddr_in6 from;
 	struct msghdr sndhdr;
 	struct iovec sndiov[2];
 	unsigned char sndbuf[CMSG_SPACE(sizeof(struct in6_pktinfo))];
 	struct msghdr rcvhdr;
 	struct iovec rcviov[2];
 	unsigned char rcvbuf[IP6BUFLEN];
 	unsigned char ansbuf[1500];
 	char ntopbuf[INET6_ADDRSTRLEN];
 	const char *sfrom;

 	int nd_fd;
 	struct ra_head *ra_routers;
 	struct rt6_head *routes;

 	struct rt6_head kroutes;

 	int dhcp_fd;
 };

 struct ipv6_ctx *ipv6_init(struct dhcpcd_ctx *);
 ssize_t ipv6_printaddr(char *, size_t, const uint8_t *, const char *);
 int ipv6_makestableprivate(struct in6_addr *addr,
     const struct in6_addr *prefix, int prefix_len,
     const struct interface *ifp, int *dad_counter);
 int ipv6_makeaddr(struct in6_addr *, const struct interface *,
     const struct in6_addr *, int);
 int ipv6_makeprefix(struct in6_addr *, const struct in6_addr *, int);
 int ipv6_mask(struct in6_addr *, int);
 uint8_t ipv6_prefixlen(const struct in6_addr *);
 int ipv6_userprefix( const struct in6_addr *, short prefix_len,
     uint64_t user_number, struct in6_addr *result, short result_len);
 void ipv6_checkaddrflags(void *);
 int ipv6_addaddr(struct ipv6_addr *, const struct timespec *);
 ssize_t ipv6_addaddrs(struct ipv6_addrhead *addrs);
 void ipv6_freedrop_addrs(struct ipv6_addrhead *, int,
     const struct interface *);
 void ipv6_handleifa(struct dhcpcd_ctx *ctx, int, struct if_head *,
     const char *, const struct in6_addr *, uint8_t, int);
 int ipv6_handleifa_addrs(int, struct ipv6_addrhead *,
     const struct in6_addr *, int);
 int ipv6_publicaddr(const struct ipv6_addr *);
 const struct ipv6_addr *ipv6_iffindaddr(const struct interface *,
     const struct in6_addr *);
 struct ipv6_addr *ipv6_findaddr(struct dhcpcd_ctx *,
     const struct in6_addr *, short);
 #define ipv6_linklocal(ifp) ipv6_iffindaddr((ifp), NULL)
 int ipv6_addlinklocalcallback(struct interface *, void (*)(void *), void *);
 void ipv6_freeaddr(struct ipv6_addr *);
 void ipv6_freedrop(struct interface *, int);
 #define ipv6_free(ifp) ipv6_freedrop((ifp), 0)
 #define ipv6_drop(ifp) ipv6_freedrop((ifp), 2)

 #ifdef IPV6_MANAGETEMPADDR
 void ipv6_gentempifid(struct interface *);
 void ipv6_settempstale(struct interface *);
 struct ipv6_addr *ipv6_createtempaddr(struct ipv6_addr *,
     const struct timespec *);
 struct ipv6_addr *ipv6_settemptime(struct ipv6_addr *, int);
 void ipv6_addtempaddrs(struct interface *, const struct timespec *);
 #else
 #define ipv6_gentempifid(a) {}
 #define ipv6_settempstale(a) {}
 #endif

 int ipv6_start(struct interface *);
 void ipv6_ctxfree(struct dhcpcd_ctx *);
 int ipv6_handlert(struct dhcpcd_ctx *, int cmd, struct rt6 *);
 void ipv6_freerts(struct rt6_head *);
 void ipv6_buildroutes(struct dhcpcd_ctx *);

 #else
 #define ipv6_init(a) (NULL)
 #define ipv6_start(a) (-1)
 #define ipv6_free_ll_callbacks(a) {}
 #define ipv6_free(a) {}
 #define ipv6_drop(a) {}
 #define ipv6_ctxfree(a) {}
 #define ipv6_gentempifid(a) {}
 #endif

 #endif
	/*
	* dhcpcd - DHCP client daemon
	* Copyright (c) 2006-2015 Roy Marples <roy@marples.name>
	* All rights reserved

	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions
	* are met:
	* 1. Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	* 2. Redistributions in binary form must reproduce the above copyright
	* notice, this list of conditions and the following disclaimer in the
	* documentation and/or other materials provided with the distribution.
	*
	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	* SUCH DAMAGE.
	*/

	#ifndef IPV6_H
	#define IPV6_H

	#include <sys/uio.h>
	#include <netinet/in.h>

	#include "config.h"
	#include "dhcpcd.h"

	#define ALLROUTERS "ff02::2"

	#define ROUNDUP8(a) (1 + (((a) - 1) \| 7))
	#define ROUNDUP16(a) (1 + (((a) - 1) \| 16))

	#define EUI64_GBIT 0x01
	#define EUI64_UBIT 0x02
	#define EUI64_TO_IFID(in6) do {(in6)->s6_addr[8] ^= EUI64_UBIT; } while (0)
	#define EUI64_GROUP(in6) ((in6)->s6_addr[8] & EUI64_GBIT)

	#ifndef ND6_INFINITE_LIFETIME
	# define ND6_INFINITE_LIFETIME ((uint32_t)~0)
	#endif

	/* RFC4941 constants */
	#define TEMP_VALID_LIFETIME 604800 /* 1 week */
	#define TEMP_PREFERRED_LIFETIME 86400 /* 1 day */
	#define REGEN_ADVANCE 5 /* seconds */
	#define MAX_DESYNC_FACTOR 600 /* 10 minutes */

	#define TEMP_IDGEN_RETRIES 3
	#define GEN_TEMPID_RETRY_MAX 5

	/* RFC7217 constants */
	#define IDGEN_RETRIES 3
	#define IDGEN_DELAY 1 /* second */

	/*
	* BSD kernels don't inform userland of DAD results.
	* See the discussion here:
	* http://mail-index.netbsd.org/tech-net/2013/03/15/msg004019.html
	*/
	#ifndef __linux__
	/* We guard here to avoid breaking a compile on linux ppc-64 headers */
	# include <sys/param.h>
	#endif
	#ifdef BSD
	# define IPV6_POLLADDRFLAG
	#endif

	/* This was fixed in NetBSD */
	#if defined(__NetBSD_Version__) && __NetBSD_Version__ >= 699002000
	# undef IPV6_POLLADDRFLAG
	#endif

	/* Linux-3.18 can manage temporary addresses even with RA
	* processing disabled. */
	//#undef IFA_F_MANAGETEMPADDR
	#if defined(__linux__) && defined(IFA_F_MANAGETEMPADDR)
	#define IPV6_MANAGETEMPADDR
	#endif

	/* Some BSDs do not allow userland to set temporary addresses. */
	#if defined(BSD) && defined(IN6_IFF_TEMPORARY)
	#define IPV6_MANAGETEMPADDR
	#endif

	struct ipv6_addr {
	TAILQ_ENTRY(ipv6_addr) next;
	struct interface *iface;
	struct in6_addr prefix;
	uint8_t prefix_len;
	uint32_t prefix_vltime;
	uint32_t prefix_pltime;
	struct timespec created;
	struct timespec acquired;
	struct in6_addr addr;
	int addr_flags;
	short flags;
	char saddr[INET6_ADDRSTRLEN];
	uint8_t iaid[4];
	uint16_t ia_type;
	struct interface *delegating_iface;
	uint8_t prefix_exclude_len;
	struct in6_addr prefix_exclude;

	void (dadcallback)(void );
	int dadcounter;
	uint8_t *ns;
	size_t nslen;
	int nsprobes;
	};
	TAILQ_HEAD(ipv6_addrhead, ipv6_addr);

	#define IPV6_AF_ONLINK 0x0001
	#define IPV6_AF_NEW 0x0002
	#define IPV6_AF_STALE 0x0004
	#define IPV6_AF_ADDED 0x0008
	#define IPV6_AF_AUTOCONF 0x0010
	#define IPV6_AF_DUPLICATED 0x0020
	#define IPV6_AF_DADCOMPLETED 0x0040
	#define IPV6_AF_DELEGATED 0x0080
	#define IPV6_AF_DELEGATEDPFX 0x0100
	#define IPV6_AF_DELEGATEDZERO 0x0200
	#define IPV6_AF_REQUEST 0x0400
	#ifdef IPV6_MANAGETEMPADDR
	#define IPV6_AF_TEMPORARY 0X0800
	#endif

	struct rt6 {
	TAILQ_ENTRY(rt6) next;
	struct in6_addr dest;
	struct in6_addr net;
	struct in6_addr gate;
	const struct interface *iface;
	unsigned int flags;
	#ifdef HAVE_ROUTE_METRIC
	unsigned int metric;
	#endif
	unsigned int mtu;
	};
	TAILQ_HEAD(rt6_head, rt6);

	struct ll_callback {
	TAILQ_ENTRY(ll_callback) next;
	void (callback)(void );
	void *arg;
	};
	TAILQ_HEAD(ll_callback_head, ll_callback);

	struct ipv6_state {
	struct ipv6_addrhead addrs;
	struct ll_callback_head ll_callbacks;

	#ifdef IPV6_MANAGETEMPADDR
	time_t desync_factor;
	uint8_t randomseed0[8]; /* upper 64 bits of MD5 digest */
	uint8_t randomseed1[8]; /* lower 64 bits */
	uint8_t randomid[8];
	#endif
	};

	#define IPV6_STATE(ifp) \
	((struct ipv6_state *)(ifp)->if_data[IF_DATA_IPV6])
	#define IPV6_CSTATE(ifp) \
	((const struct ipv6_state *)(ifp)->if_data[IF_DATA_IPV6])

	/* dhcpcd requires CMSG_SPACE to evaluate to a compile time constant. */
	#ifdef __QNX__
	#undef CMSG_SPACE
	#endif

	#ifndef ALIGNBYTES
	#define ALIGNBYTES (sizeof(int) - 1)
	#endif
	#ifndef ALIGN
	#define ALIGN(p) (((unsigned int)(p) + ALIGNBYTES) & ~ALIGNBYTES)
	#endif
	#ifndef CMSG_SPACE
	#define CMSG_SPACE(len) (ALIGN(sizeof(struct cmsghdr)) + ALIGN(len))
	#endif

	#define IP6BUFLEN (CMSG_SPACE(sizeof(struct in6_pktinfo)) + \
	CMSG_SPACE(sizeof(int)))


	#ifdef INET6
	struct ipv6_ctx {
	struct sockaddr_in6 from;
	struct msghdr sndhdr;
	struct iovec sndiov[2];
	unsigned char sndbuf[CMSG_SPACE(sizeof(struct in6_pktinfo))];
	struct msghdr rcvhdr;
	struct iovec rcviov[2];
	unsigned char rcvbuf[IP6BUFLEN];
	unsigned char ansbuf[1500];
	char ntopbuf[INET6_ADDRSTRLEN];
	const char *sfrom;

	int nd_fd;
	struct ra_head *ra_routers;
	struct rt6_head *routes;

	struct rt6_head kroutes;

	int dhcp_fd;
	};

	struct ipv6_ctx ipv6_init(struct dhcpcd_ctx );
	ssize_t ipv6_printaddr(char , size_t, const uint8_t , const char *);
	int ipv6_makestableprivate(struct in6_addr *addr,
	const struct in6_addr *prefix, int prefix_len,
	const struct interface ifp, int dad_counter);
	int ipv6_makeaddr(struct in6_addr , const struct interface ,
	const struct in6_addr *, int);
	int ipv6_makeprefix(struct in6_addr , const struct in6_addr , int);
	int ipv6_mask(struct in6_addr *, int);
	uint8_t ipv6_prefixlen(const struct in6_addr *);
	int ipv6_userprefix( const struct in6_addr *, short prefix_len,
	uint64_t user_number, struct in6_addr *result, short result_len);
	void ipv6_checkaddrflags(void *);
	int ipv6_addaddr(struct ipv6_addr , const struct timespec );
	ssize_t ipv6_addaddrs(struct ipv6_addrhead *addrs);
	void ipv6_freedrop_addrs(struct ipv6_addrhead *, int,
	const struct interface *);
	void ipv6_handleifa(struct dhcpcd_ctx ctx, int, struct if_head ,
	const char , const struct in6_addr , uint8_t, int);
	int ipv6_handleifa_addrs(int, struct ipv6_addrhead *,
	const struct in6_addr *, int);
	int ipv6_publicaddr(const struct ipv6_addr *);
	const struct ipv6_addr ipv6_iffindaddr(const struct interface ,
	const struct in6_addr *);
	struct ipv6_addr ipv6_findaddr(struct dhcpcd_ctx ,
	const struct in6_addr *, short);
	#define ipv6_linklocal(ifp) ipv6_iffindaddr((ifp), NULL)
	int ipv6_addlinklocalcallback(struct interface , void ()(void ), void );
	void ipv6_freeaddr(struct ipv6_addr *);
	void ipv6_freedrop(struct interface *, int);
	#define ipv6_free(ifp) ipv6_freedrop((ifp), 0)
	#define ipv6_drop(ifp) ipv6_freedrop((ifp), 2)

	#ifdef IPV6_MANAGETEMPADDR
	void ipv6_gentempifid(struct interface *);
	void ipv6_settempstale(struct interface *);
	struct ipv6_addr ipv6_createtempaddr(struct ipv6_addr ,
	const struct timespec *);
	struct ipv6_addr ipv6_settemptime(struct ipv6_addr , int);
	void ipv6_addtempaddrs(struct interface , const struct timespec );
	#else
	#define ipv6_gentempifid(a) {}
	#define ipv6_settempstale(a) {}
	#endif

	int ipv6_start(struct interface *);
	void ipv6_ctxfree(struct dhcpcd_ctx *);
	int ipv6_handlert(struct dhcpcd_ctx , int cmd, struct rt6 );
	void ipv6_freerts(struct rt6_head *);
	void ipv6_buildroutes(struct dhcpcd_ctx *);

	#else
	#define ipv6_init(a) (NULL)
	#define ipv6_start(a) (-1)
	#define ipv6_free_ll_callbacks(a) {}
	#define ipv6_free(a) {}
	#define ipv6_drop(a) {}
	#define ipv6_ctxfree(a) {}
	#define ipv6_gentempifid(a) {}
	#endif

	#endif