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 IPV6ND_H
29 #define IPV6ND_H
30 
31 #include <time.h>
32 
33 #include "config.h"
34 #include "dhcpcd.h"
35 #include "ipv6.h"
36 
37 struct ra_opt {
38 	TAILQ_ENTRY(ra_opt) next;
39 	uint16_t type;
40 	struct timespec expire;
41 	char *option;
42 };
43 
44 struct ra {
45 	TAILQ_ENTRY(ra) next;
46 	struct interface *iface;
47 	struct in6_addr from;
48 	char sfrom[INET6_ADDRSTRLEN];
49 	unsigned char *data;
50 	size_t data_len;
51 	struct timespec received;
52 	unsigned char flags;
53 	uint32_t lifetime;
54 	uint32_t reachable;
55 	uint32_t retrans;
56 	uint32_t mtu;
57 	struct ipv6_addrhead addrs;
58 	TAILQ_HEAD(, ra_opt) options;
59 	uint8_t expired;
60 	uint8_t no_public_warned;
61 };
62 
63 TAILQ_HEAD(ra_head, ra);
64 
65 struct rs_state {
66 	unsigned char *rs;
67 	size_t rslen;
68 	int rsprobes;
69 };
70 
71 #define RS_STATE(a) ((struct rs_state *)(ifp)->if_data[IF_DATA_IPV6ND])
72 #define RS_STATE_RUNNING(a) (ipv6nd_hasra((a)) && ipv6nd_dadcompleted((a)))
73 
74 #define MAX_RTR_SOLICITATION_DELAY	1	/* seconds */
75 #define MAX_UNICAST_SOLICIT		3	/* 3 transmissions */
76 #define RTR_SOLICITATION_INTERVAL	4	/* seconds */
77 #define MAX_RTR_SOLICITATIONS		3	/* times */
78 
79 /* On carrier up, expire known routers after RTR_CARRIER_EXPIRE seconds. */
80 #define RTR_CARRIER_EXPIRE		\
81     (MAX_RTR_SOLICITATION_DELAY +	\
82     (MAX_RTR_SOLICITATIONS + 1) *	\
83     RTR_SOLICITATION_INTERVAL)
84 
85 #define MAX_REACHABLE_TIME		3600000	/* milliseconds */
86 #define REACHABLE_TIME			30000	/* milliseconds */
87 #define RETRANS_TIMER			1000	/* milliseconds */
88 #define DELAY_FIRST_PROBE_TIME		5	/* seconds */
89 
90 #define IPV6ND_REACHABLE		(1 << 0)
91 #define IPV6ND_ROUTER			(1 << 1)
92 
93 #ifdef INET6
94 void ipv6nd_startrs(struct interface *);
95 ssize_t ipv6nd_env(char **, const char *, const struct interface *);
96 struct ipv6_addr *ipv6nd_findaddr(struct dhcpcd_ctx *,
97     const struct in6_addr *, short);
98 void ipv6nd_freedrop_ra(struct ra *, int);
99 #define ipv6nd_free_ra(ra) ipv6nd_freedrop_ra((ra),  0)
100 #define ipv6nd_drop_ra(ra) ipv6nd_freedrop_ra((ra),  1)
101 ssize_t ipv6nd_free(struct interface *);
102 void ipv6nd_expirera(void *arg);
103 int ipv6nd_hasra(const struct interface *);
104 int ipv6nd_hasradhcp(const struct interface *);
105 void ipv6nd_runignoredra(struct interface *);
106 void ipv6nd_handleifa(struct dhcpcd_ctx *, int,
107     const char *, const struct in6_addr *, int);
108 int ipv6nd_dadcompleted(const struct interface *);
109 void ipv6nd_expire(struct interface *, uint32_t);
110 void ipv6nd_drop(struct interface *);
111 void ipv6nd_neighbour(struct dhcpcd_ctx *, struct in6_addr *, int);
112 #else
113 #define ipv6nd_startrs(a) {}
114 #define ipv6nd_findaddr(a, b, c) (0)
115 #define ipv6nd_free(a) {}
116 #define ipv6nd_hasra(a) (0)
117 #define ipv6nd_dadcompleted(a) (0)
118 #define ipv6nd_drop(a) {}
119 #endif
120 
121 #endif
122