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      1 /* SPDX-License-Identifier: BSD-2-Clause */
      2 /*
      3  * dhcpcd - IPv6 ND handling
      4  * Copyright (c) 2006-2025 Roy Marples <roy (at) marples.name>
      5  * All rights reserved
      6 
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     26  * SUCH DAMAGE.
     27  */
     28 
     29 #ifndef IPV6ND_H
     30 #define IPV6ND_H
     31 
     32 #ifdef INET6
     33 
     34 #include <time.h>
     35 
     36 #include "config.h"
     37 #include "dhcpcd.h"
     38 #include "ipv6.h"
     39 
     40 /* rfc4191 */
     41 struct routeinfo {
     42 	TAILQ_ENTRY(routeinfo) next;
     43 	struct in6_addr prefix;
     44 	uint8_t prefix_len;
     45 	uint32_t lifetime;
     46 	uint8_t flags;
     47 	struct timespec acquired;
     48 	char sprefix[INET6_ADDRSTRLEN];
     49 };
     50 
     51 TAILQ_HEAD(routeinfohead, routeinfo);
     52 
     53 
     54 struct ra {
     55 	TAILQ_ENTRY(ra) next;
     56 	struct interface *iface;
     57 	struct in6_addr from;
     58 	char sfrom[INET6_ADDRSTRLEN];
     59 	uint8_t *data;
     60 	size_t data_len;
     61 	struct timespec acquired;
     62 	uint8_t flags;
     63 	uint32_t lifetime;
     64 	uint32_t reachable;
     65 	uint32_t retrans;
     66 	uint32_t mtu;
     67 	uint8_t hoplimit;
     68 	struct ipv6_addrhead addrs;
     69 	struct routeinfohead rinfos;
     70 	bool hasdns;
     71 	bool expired;
     72 	bool willexpire;
     73 	bool doexpire;
     74 	bool isreachable;
     75 };
     76 
     77 TAILQ_HEAD(ra_head, ra);
     78 
     79 struct rs_state {
     80 	struct nd_router_solicit *rs;
     81 	size_t rslen;
     82 	int rsprobes;
     83 	uint32_t retrans;
     84 #ifdef __sun
     85 	int nd_fd;
     86 #endif
     87 };
     88 
     89 #define	RS_STATE(a) ((struct rs_state *)(ifp)->if_data[IF_DATA_IPV6ND])
     90 #define	RS_CSTATE(a) ((const struct rs_state *)(ifp)->if_data[IF_DATA_IPV6ND])
     91 #define	RS_STATE_RUNNING(a) (ipv6nd_hasra((a)) && ipv6nd_dadcompleted((a)))
     92 
     93 #ifndef MAX_RTR_SOLICITATION_DELAY
     94 #define	MAX_RTR_SOLICITATION_DELAY	1	/* seconds */
     95 #define	MAX_UNICAST_SOLICIT		3	/* 3 transmissions */
     96 #define	RTR_SOLICITATION_INTERVAL	4	/* seconds */
     97 #define	MAX_RTR_SOLICITATIONS		3	/* times */
     98 #define	MAX_NEIGHBOR_ADVERTISEMENT	3	/* 3 transmissions */
     99 
    100 #ifndef IPV6_DEFHLIM
    101 #define	IPV6_DEFHLIM			64
    102 #endif
    103 #endif
    104 
    105 /* On carrier up, expire known routers after RTR_CARRIER_EXPIRE seconds. */
    106 #define RTR_CARRIER_EXPIRE		\
    107     (MAX_RTR_SOLICITATION_DELAY +	\
    108     (MAX_RTR_SOLICITATIONS + 1) *	\
    109     RTR_SOLICITATION_INTERVAL)
    110 
    111 #define	MAX_REACHABLE_TIME		3600000	/* milliseconds */
    112 #define	REACHABLE_TIME			30000	/* milliseconds */
    113 #define	RETRANS_TIMER			1000	/* milliseconds */
    114 #define	DELAY_FIRST_PROBE_TIME		5	/* seconds */
    115 
    116 #define	MIN_EXTENDED_VLTIME		7200	/* seconds */
    117 
    118 int ipv6nd_open(bool);
    119 #ifdef __sun
    120 int ipv6nd_openif(struct interface *);
    121 #endif
    122 void ipv6nd_recvmsg(struct dhcpcd_ctx *, struct msghdr *);
    123 int ipv6nd_rtpref(uint8_t);
    124 void ipv6nd_printoptions(const struct dhcpcd_ctx *,
    125     const struct dhcp_opt *, size_t);
    126 void ipv6nd_startrs(struct interface *);
    127 ssize_t ipv6nd_env(FILE *, const struct interface *);
    128 const struct ipv6_addr *ipv6nd_iffindaddr(const struct interface *ifp,
    129     const struct in6_addr *addr, unsigned int flags);
    130 struct ipv6_addr *ipv6nd_findaddr(struct dhcpcd_ctx *,
    131     const struct in6_addr *, unsigned int);
    132 struct ipv6_addr *ipv6nd_iffindprefix(struct interface *,
    133     const struct in6_addr *, uint8_t);
    134 ssize_t ipv6nd_free(struct interface *);
    135 void ipv6nd_expirera(void *arg);
    136 bool ipv6nd_hasralifetime(const struct interface *, bool);
    137 #define	ipv6nd_hasra(i)		ipv6nd_hasralifetime((i), false)
    138 bool ipv6nd_hasradhcp(const struct interface *, bool);
    139 void ipv6nd_handleifa(int, struct ipv6_addr *, pid_t);
    140 int ipv6nd_dadcompleted(const struct interface *);
    141 void ipv6nd_advertise(struct ipv6_addr *);
    142 void ipv6nd_startexpire(struct interface *);
    143 void ipv6nd_drop(struct interface *);
    144 void ipv6nd_neighbour(struct dhcpcd_ctx *, struct in6_addr *, bool);
    145 void ipv6nd_abort(struct interface *);
    146 #endif /* INET6 */
    147 
    148 #endif /* IPV6ND_H */
    149