/*
* 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