1/*
2 * dhcpcd - DHCP client daemon
3 * Copyright (c) 2006-2019 Roy Marples <roy@marples.name>
4 * All rights reserved
5
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27
28#ifndef IPV6_H
29#define IPV6_H
30
31#include <sys/uio.h>
32#include <netinet/in.h>
33
34#include "config.h"
35#include "if.h"
36
37#ifndef __linux__
38# if !defined(__QNX__) && !defined(__sun)
39# include <sys/endian.h>
40# endif
41# include <net/if.h>
42# ifndef __sun
43# include <netinet6/in6_var.h>
44# endif
45#endif
46
47#define EUI64_GBIT 0x01
48#define EUI64_UBIT 0x02
49#define EUI64_TO_IFID(in6) do {(in6)->s6_addr[8] ^= EUI64_UBIT; } while (0)
50#define EUI64_GROUP(in6) ((in6)->s6_addr[8] & EUI64_GBIT)
51
52#ifndef ND6_INFINITE_LIFETIME
53# define ND6_INFINITE_LIFETIME ((uint32_t)~0)
54#endif
55
56/* RFC4941 constants */
57#define TEMP_VALID_LIFETIME 604800 /* 1 week */
58#define TEMP_PREFERRED_LIFETIME 86400 /* 1 day */
59#define REGEN_ADVANCE 5 /* seconds */
60#define MAX_DESYNC_FACTOR 600 /* 10 minutes */
61
62#define TEMP_IDGEN_RETRIES 3
63#define GEN_TEMPID_RETRY_MAX 5
64
65/* RFC7217 constants */
66#define IDGEN_RETRIES 3
67#define IDGEN_DELAY 1 /* second */
68
69#ifndef IN6_ARE_MASKED_ADDR_EQUAL
70#define IN6_ARE_MASKED_ADDR_EQUAL(d, a, m) ( \
71 (((d)->s6_addr32[0] ^ (a)->s6_addr32[0]) & (m)->s6_addr32[0]) == 0 && \
72 (((d)->s6_addr32[1] ^ (a)->s6_addr32[1]) & (m)->s6_addr32[1]) == 0 && \
73 (((d)->s6_addr32[2] ^ (a)->s6_addr32[2]) & (m)->s6_addr32[2]) == 0 && \
74 (((d)->s6_addr32[3] ^ (a)->s6_addr32[3]) & (m)->s6_addr32[3]) == 0 )
75#endif
76
77#ifndef IN6ADDR_LINKLOCAL_ALLNODES_INIT
78#define IN6ADDR_LINKLOCAL_ALLNODES_INIT \
79 {{{ 0xff, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, \
80 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01 }}}
81#endif
82#ifndef IN6ADDR_LINKLOCAL_ALLROUTERS_INIT
83#define IN6ADDR_LINKLOCAL_ALLROUTERS_INIT \
84 {{{ 0xff, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, \
85 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02 }}}
86#endif
87
88/*
89 * BSD kernels don't inform userland of DAD results.
90 * See the discussion here:
91 * http://mail-index.netbsd.org/tech-net/2013/03/15/msg004019.html
92 */
93#ifndef __linux__
94/* We guard here to avoid breaking a compile on linux ppc-64 headers */
95# include <sys/param.h>
96#endif
97#ifdef BSD
98# define IPV6_POLLADDRFLAG
99#endif
100
101/* This was fixed in NetBSD */
102#if defined(__NetBSD_Version__) && __NetBSD_Version__ >= 699002000
103# undef IPV6_POLLADDRFLAG
104#endif
105
106#ifdef __sun
107 /* Solaris lacks these defines.
108 * While it supports DaD, to seems to only expose IFF_DUPLICATE
109 * so we have no way of knowing if it's tentative or not.
110 * I don't even know if Solaris has any special treatment for tentative. */
111# define IN6_IFF_TENTATIVE 0
112# define IN6_IFF_DUPLICATED 0x04
113# define IN6_IFF_DETACHED 0
114#endif
115
116#define IN6_IFF_NOTUSEABLE \
117 (IN6_IFF_TENTATIVE | IN6_IFF_DUPLICATED | IN6_IFF_DETACHED)
118
119/*
120 * If dhcpcd handles RA processing instead of the kernel, the kernel needs
121 * to either allow userland to set temporary addresses or mark an address
122 * for the kernel to manage temporary addresses from.
123 * If the kernel allows the former, a global #define is needed, otherwise
124 * the address marking will be handled in the platform specific address handler.
125 *
126 * Some BSDs do not allow userland to set temporary addresses.
127 * Linux-3.18 allows the marking of addresses from which to manage temp addrs.
128 */
129#if defined(IN6_IFF_TEMPORARY) && !defined(__linux__)
130#define IPV6_MANAGETEMPADDR
131#endif
132
133#ifdef __linux__
134 /* Match Linux defines to BSD */
135# ifdef IFA_F_TEMPORARY
136# define IN6_IFF_TEMPORARY IFA_F_TEMPORARY
137# endif
138# ifdef IFA_F_OPTIMISTIC
139# define IN6_IFF_TENTATIVE (IFA_F_TENTATIVE | IFA_F_OPTIMISTIC)
140# else
141# define IN6_IFF_TENTATIVE (IFA_F_TENTATIVE | 0x04)
142# endif
143# ifdef IF_F_DADFAILED
144# define IN6_IFF_DUPLICATED IFA_F_DADFAILED
145# else
146# define IN6_IFF_DUPLICATED 0x08
147# endif
148# define IN6_IFF_DETACHED 0
149#endif
150
151#ifdef INET6
152TAILQ_HEAD(ipv6_addrhead, ipv6_addr);
153struct ipv6_addr {
154 TAILQ_ENTRY(ipv6_addr) next;
155 struct interface *iface;
156 struct in6_addr prefix;
157 uint8_t prefix_len;
158 uint32_t prefix_vltime;
159 uint32_t prefix_pltime;
160 struct timespec created;
161 struct timespec acquired;
162 struct in6_addr addr;
163 int addr_flags;
164 unsigned int flags;
165 char saddr[INET6_ADDRSTRLEN];
166 uint8_t iaid[4];
167 uint16_t ia_type;
168 int dhcp6_fd;
169
170#ifndef SMALL
171 struct ipv6_addr *delegating_prefix;
172 struct ipv6_addrhead pd_pfxs;
173 TAILQ_ENTRY(ipv6_addr) pd_next;
174
175 uint8_t prefix_exclude_len;
176 struct in6_addr prefix_exclude;
177#endif
178
179 void (*dadcallback)(void *);
180 int dadcounter;
181
182 struct nd_neighbor_advert *na;
183 size_t na_len;
184 int na_count;
185
186#ifdef ALIAS_ADDR
187 char alias[IF_NAMESIZE];
188#endif
189};
190
191#define IPV6_AF_ONLINK (1U << 0)
192#define IPV6_AF_NEW (1U << 1)
193#define IPV6_AF_STALE (1U << 2)
194#define IPV6_AF_ADDED (1U << 3)
195#define IPV6_AF_AUTOCONF (1U << 4)
196#define IPV6_AF_DUPLICATED (1U << 5)
197#define IPV6_AF_DADCOMPLETED (1U << 6)
198#define IPV6_AF_DELEGATED (1U << 7)
199#define IPV6_AF_DELEGATEDPFX (1U << 8)
200#define IPV6_AF_NOREJECT (1U << 9)
201#define IPV6_AF_REQUEST (1U << 10)
202#define IPV6_AF_STATIC (1U << 11)
203#define IPV6_AF_DELEGATEDLOG (1U << 12)
204#define IPV6_AF_RAPFX (1U << 13)
205#define IPV6_AF_EXTENDED (1U << 14)
206#ifdef IPV6_MANAGETEMPADDR
207#define IPV6_AF_TEMPORARY (1U << 15)
208#endif
209
210struct ll_callback {
211 TAILQ_ENTRY(ll_callback) next;
212 void (*callback)(void *);
213 void *arg;
214};
215TAILQ_HEAD(ll_callback_head, ll_callback);
216
217struct ipv6_state {
218 struct ipv6_addrhead addrs;
219 struct ll_callback_head ll_callbacks;
220
221#ifdef IPV6_MANAGETEMPADDR
222 time_t desync_factor;
223 uint8_t randomseed0[8]; /* upper 64 bits of MD5 digest */
224 uint8_t randomseed1[8]; /* lower 64 bits */
225 uint8_t randomid[8];
226#endif
227};
228
229#define IPV6_STATE(ifp) \
230 ((struct ipv6_state *)(ifp)->if_data[IF_DATA_IPV6])
231#define IPV6_CSTATE(ifp) \
232 ((const struct ipv6_state *)(ifp)->if_data[IF_DATA_IPV6])
233#define IPV6_STATE_RUNNING(ifp) ipv6_staticdadcompleted((ifp))
234
235
236int ipv6_init(struct dhcpcd_ctx *);
237int ipv6_makestableprivate(struct in6_addr *addr,
238 const struct in6_addr *prefix, int prefix_len,
239 const struct interface *ifp, int *dad_counter);
240int ipv6_makeaddr(struct in6_addr *, struct interface *,
241 const struct in6_addr *, int);
242int ipv6_mask(struct in6_addr *, int);
243uint8_t ipv6_prefixlen(const struct in6_addr *);
244int ipv6_userprefix( const struct in6_addr *, short prefix_len,
245 uint64_t user_number, struct in6_addr *result, short result_len);
246void ipv6_checkaddrflags(void *);
247void ipv6_markaddrsstale(struct interface *, unsigned int);
248void ipv6_deletestaleaddrs(struct interface *);
249int ipv6_addaddr(struct ipv6_addr *, const struct timespec *);
250ssize_t ipv6_addaddrs(struct ipv6_addrhead *addrs);
251void ipv6_deleteaddr(struct ipv6_addr *);
252void ipv6_freedrop_addrs(struct ipv6_addrhead *, int,
253 const struct interface *);
254void ipv6_handleifa(struct dhcpcd_ctx *ctx, int, struct if_head *,
255 const char *, const struct in6_addr *, uint8_t, int, pid_t);
256int ipv6_handleifa_addrs(int, struct ipv6_addrhead *, const struct ipv6_addr *,
257 pid_t);
258struct ipv6_addr *ipv6_iffindaddr(struct interface *,
259 const struct in6_addr *, int);
260int ipv6_hasaddr(const struct interface *);
261int ipv6_findaddrmatch(const struct ipv6_addr *, const struct in6_addr *,
262 unsigned int);
263struct ipv6_addr *ipv6_findaddr(struct dhcpcd_ctx *,
264 const struct in6_addr *, unsigned int);
265struct ipv6_addr *ipv6_findmaskaddr(struct dhcpcd_ctx *,
266 const struct in6_addr *);
267#define ipv6_linklocal(ifp) ipv6_iffindaddr((ifp), NULL, IN6_IFF_NOTUSEABLE)
268int ipv6_addlinklocalcallback(struct interface *, void (*)(void *), void *);
269struct ipv6_addr *ipv6_newaddr(struct interface *, const struct in6_addr *, uint8_t,
270 unsigned int);
271void ipv6_freeaddr(struct ipv6_addr *);
272void ipv6_freedrop(struct interface *, int);
273#define ipv6_free(ifp) ipv6_freedrop((ifp), 0)
274#define ipv6_drop(ifp) ipv6_freedrop((ifp), 2)
275
276#ifdef IPV6_MANAGETEMPADDR
277void ipv6_gentempifid(struct interface *);
278struct ipv6_addr *ipv6_createtempaddr(struct ipv6_addr *,
279 const struct timespec *);
280struct ipv6_addr *ipv6_settemptime(struct ipv6_addr *, int);
281void ipv6_addtempaddrs(struct interface *, const struct timespec *);
282#else
283#define ipv6_gentempifid(a) {}
284#define ipv6_settempstale(a) {}
285#endif
286
287int ipv6_start(struct interface *);
288int ipv6_staticdadcompleted(const struct interface *);
289int ipv6_startstatic(struct interface *);
290ssize_t ipv6_env(char **, const char *, const struct interface *);
291void ipv6_ctxfree(struct dhcpcd_ctx *);
292bool inet6_getroutes(struct dhcpcd_ctx *, struct rt_head *);
293#endif /* INET6 */
294
295#endif /* INET6_H */
296