1/*
2 * dhcpcd - DHCP client daemon
3 * Copyright (c) 2006-2015 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 "dhcpcd.h"
36
37#define ALLROUTERS "ff02::2"
38
39#define ROUNDUP8(a)  (1 + (((a) - 1) |  7))
40#define ROUNDUP16(a) (1 + (((a) - 1) | 16))
41
42#define EUI64_GBIT		0x01
43#define EUI64_UBIT		0x02
44#define EUI64_TO_IFID(in6)	do {(in6)->s6_addr[8] ^= EUI64_UBIT; } while (0)
45#define EUI64_GROUP(in6)	((in6)->s6_addr[8] & EUI64_GBIT)
46
47#ifndef ND6_INFINITE_LIFETIME
48#  define ND6_INFINITE_LIFETIME		((uint32_t)~0)
49#endif
50
51/* RFC4941 constants */
52#define TEMP_VALID_LIFETIME	604800	/* 1 week */
53#define TEMP_PREFERRED_LIFETIME	86400	/* 1 day */
54#define REGEN_ADVANCE		5	/* seconds */
55#define MAX_DESYNC_FACTOR	600	/* 10 minutes */
56
57#define TEMP_IDGEN_RETRIES	3
58#define GEN_TEMPID_RETRY_MAX	5
59
60/* RFC7217 constants */
61#define IDGEN_RETRIES	3
62#define IDGEN_DELAY	1 /* second */
63
64/*
65 * BSD kernels don't inform userland of DAD results.
66 * See the discussion here:
67 *    http://mail-index.netbsd.org/tech-net/2013/03/15/msg004019.html
68 */
69#ifndef __linux__
70/* We guard here to avoid breaking a compile on linux ppc-64 headers */
71#  include <sys/param.h>
72#endif
73#ifdef BSD
74#  define IPV6_POLLADDRFLAG
75#endif
76
77/* This was fixed in NetBSD */
78#if defined(__NetBSD_Version__) && __NetBSD_Version__ >= 699002000
79#  undef IPV6_POLLADDRFLAG
80#endif
81
82/* Linux-3.18 can manage temporary addresses even with RA
83 * processing disabled. */
84//#undef IFA_F_MANAGETEMPADDR
85#if defined(__linux__) && defined(IFA_F_MANAGETEMPADDR)
86#define IPV6_MANAGETEMPADDR
87#endif
88
89/* Some BSDs do not allow userland to set temporary addresses. */
90#if defined(BSD) && defined(IN6_IFF_TEMPORARY)
91#define IPV6_MANAGETEMPADDR
92#endif
93
94struct ipv6_addr {
95	TAILQ_ENTRY(ipv6_addr) next;
96	struct interface *iface;
97	struct in6_addr prefix;
98	uint8_t prefix_len;
99	uint32_t prefix_vltime;
100	uint32_t prefix_pltime;
101	struct timespec created;
102	struct timespec acquired;
103	struct in6_addr addr;
104	int addr_flags;
105	short flags;
106	char saddr[INET6_ADDRSTRLEN];
107	uint8_t iaid[4];
108	uint16_t ia_type;
109	struct interface *delegating_iface;
110	uint8_t prefix_exclude_len;
111	struct in6_addr prefix_exclude;
112
113	void (*dadcallback)(void *);
114	int dadcounter;
115	uint8_t *ns;
116	size_t nslen;
117	int nsprobes;
118};
119TAILQ_HEAD(ipv6_addrhead, ipv6_addr);
120
121#define IPV6_AF_ONLINK		0x0001
122#define	IPV6_AF_NEW		0x0002
123#define IPV6_AF_STALE		0x0004
124#define IPV6_AF_ADDED		0x0008
125#define IPV6_AF_AUTOCONF	0x0010
126#define IPV6_AF_DUPLICATED	0x0020
127#define IPV6_AF_DADCOMPLETED	0x0040
128#define IPV6_AF_DELEGATED	0x0080
129#define IPV6_AF_DELEGATEDPFX	0x0100
130#define IPV6_AF_DELEGATEDZERO	0x0200
131#define IPV6_AF_REQUEST		0x0400
132#ifdef IPV6_MANAGETEMPADDR
133#define IPV6_AF_TEMPORARY	0X0800
134#endif
135
136struct rt6 {
137	TAILQ_ENTRY(rt6) next;
138	struct in6_addr dest;
139	struct in6_addr net;
140	struct in6_addr gate;
141	const struct interface *iface;
142	unsigned int flags;
143#ifdef HAVE_ROUTE_METRIC
144	unsigned int metric;
145#endif
146	unsigned int mtu;
147};
148TAILQ_HEAD(rt6_head, rt6);
149
150struct ll_callback {
151	TAILQ_ENTRY(ll_callback) next;
152	void (*callback)(void *);
153	void *arg;
154};
155TAILQ_HEAD(ll_callback_head, ll_callback);
156
157struct ipv6_state {
158	struct ipv6_addrhead addrs;
159	struct ll_callback_head ll_callbacks;
160
161#ifdef IPV6_MANAGETEMPADDR
162	time_t desync_factor;
163	uint8_t randomseed0[8]; /* upper 64 bits of MD5 digest */
164	uint8_t randomseed1[8]; /* lower 64 bits */
165	uint8_t randomid[8];
166#endif
167};
168
169#define IPV6_STATE(ifp)							       \
170	((struct ipv6_state *)(ifp)->if_data[IF_DATA_IPV6])
171#define IPV6_CSTATE(ifp)						       \
172	((const struct ipv6_state *)(ifp)->if_data[IF_DATA_IPV6])
173
174/* dhcpcd requires CMSG_SPACE to evaluate to a compile time constant. */
175#ifdef __QNX__
176#undef CMSG_SPACE
177#endif
178
179#ifndef ALIGNBYTES
180#define ALIGNBYTES (sizeof(int) - 1)
181#endif
182#ifndef ALIGN
183#define	ALIGN(p) (((unsigned int)(p) + ALIGNBYTES) & ~ALIGNBYTES)
184#endif
185#ifndef CMSG_SPACE
186#define	CMSG_SPACE(len)	(ALIGN(sizeof(struct cmsghdr)) + ALIGN(len))
187#endif
188
189#define IP6BUFLEN	(CMSG_SPACE(sizeof(struct in6_pktinfo)) + \
190			CMSG_SPACE(sizeof(int)))
191
192
193#ifdef INET6
194struct ipv6_ctx {
195	struct sockaddr_in6 from;
196	struct msghdr sndhdr;
197	struct iovec sndiov[2];
198	unsigned char sndbuf[CMSG_SPACE(sizeof(struct in6_pktinfo))];
199	struct msghdr rcvhdr;
200	struct iovec rcviov[2];
201	unsigned char rcvbuf[IP6BUFLEN];
202	unsigned char ansbuf[1500];
203	char ntopbuf[INET6_ADDRSTRLEN];
204	const char *sfrom;
205
206	int nd_fd;
207	struct ra_head *ra_routers;
208	struct rt6_head *routes;
209
210	struct rt6_head kroutes;
211
212	int dhcp_fd;
213};
214
215struct ipv6_ctx *ipv6_init(struct dhcpcd_ctx *);
216ssize_t ipv6_printaddr(char *, size_t, const uint8_t *, const char *);
217int ipv6_makestableprivate(struct in6_addr *addr,
218    const struct in6_addr *prefix, int prefix_len,
219    const struct interface *ifp, int *dad_counter);
220int ipv6_makeaddr(struct in6_addr *, const struct interface *,
221    const struct in6_addr *, int);
222int ipv6_makeprefix(struct in6_addr *, const struct in6_addr *, int);
223int ipv6_mask(struct in6_addr *, int);
224uint8_t ipv6_prefixlen(const struct in6_addr *);
225int ipv6_userprefix( const struct in6_addr *, short prefix_len,
226    uint64_t user_number, struct in6_addr *result, short result_len);
227void ipv6_checkaddrflags(void *);
228int ipv6_addaddr(struct ipv6_addr *, const struct timespec *);
229ssize_t ipv6_addaddrs(struct ipv6_addrhead *addrs);
230void ipv6_freedrop_addrs(struct ipv6_addrhead *, int,
231    const struct interface *);
232void ipv6_handleifa(struct dhcpcd_ctx *ctx, int, struct if_head *,
233    const char *, const struct in6_addr *, uint8_t, int);
234int ipv6_handleifa_addrs(int, struct ipv6_addrhead *,
235    const struct in6_addr *, int);
236int ipv6_publicaddr(const struct ipv6_addr *);
237const struct ipv6_addr *ipv6_iffindaddr(const struct interface *,
238    const struct in6_addr *);
239struct ipv6_addr *ipv6_findaddr(struct dhcpcd_ctx *,
240    const struct in6_addr *, short);
241#define ipv6_linklocal(ifp) ipv6_iffindaddr((ifp), NULL)
242int ipv6_addlinklocalcallback(struct interface *, void (*)(void *), void *);
243void ipv6_freeaddr(struct ipv6_addr *);
244void ipv6_freedrop(struct interface *, int);
245#define ipv6_free(ifp) ipv6_freedrop((ifp), 0)
246#define ipv6_drop(ifp) ipv6_freedrop((ifp), 2)
247
248#ifdef IPV6_MANAGETEMPADDR
249void ipv6_gentempifid(struct interface *);
250void ipv6_settempstale(struct interface *);
251struct ipv6_addr *ipv6_createtempaddr(struct ipv6_addr *,
252    const struct timespec *);
253struct ipv6_addr *ipv6_settemptime(struct ipv6_addr *, int);
254void ipv6_addtempaddrs(struct interface *, const struct timespec *);
255#else
256#define ipv6_gentempifid(a) {}
257#define ipv6_settempstale(a) {}
258#endif
259
260int ipv6_start(struct interface *);
261void ipv6_ctxfree(struct dhcpcd_ctx *);
262int ipv6_handlert(struct dhcpcd_ctx *, int cmd, struct rt6 *);
263void ipv6_freerts(struct rt6_head *);
264void ipv6_buildroutes(struct dhcpcd_ctx *);
265
266#else
267#define ipv6_init(a) (NULL)
268#define ipv6_start(a) (-1)
269#define ipv6_free_ll_callbacks(a) {}
270#define ipv6_free(a) {}
271#define ipv6_drop(a) {}
272#define ipv6_ctxfree(a) {}
273#define ipv6_gentempifid(a) {}
274#endif
275
276#endif
277