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      1 /*
      2  * dhcpcd - IPv6 ND handling
      3  * SPDX-License-Identifier: BSD-2-Clause
      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 struct ra {
     54 	TAILQ_ENTRY(ra) next;
     55 	struct interface *iface;
     56 	struct in6_addr from;
     57 	char sfrom[INET6_ADDRSTRLEN];
     58 	uint8_t *data;
     59 	size_t data_len;
     60 	struct timespec acquired;
     61 	uint8_t flags;
     62 	uint32_t lifetime;
     63 	uint32_t reachable;
     64 	uint32_t retrans;
     65 	uint32_t mtu;
     66 	uint8_t hoplimit;
     67 	struct ipv6_addrhead addrs;
     68 	struct routeinfohead rinfos;
     69 	bool hasdns;
     70 	bool expired;
     71 	bool willexpire;
     72 	bool doexpire;
     73 	bool isreachable;
     74 };
     75 
     76 TAILQ_HEAD(ra_head, ra);
     77 
     78 struct rs_state {
     79 	struct nd_router_solicit *rs;
     80 	size_t rslen;
     81 	int rsprobes;
     82 	uint32_t retrans;
     83 #ifdef __sun
     84 	int nd_fd;
     85 #endif
     86 };
     87 
     88 #define RS_STATE(a)	    ((struct rs_state *)(ifp)->if_data[IF_DATA_IPV6ND])
     89 #define RS_CSTATE(a)	    ((const struct rs_state *)(ifp)->if_data[IF_DATA_IPV6ND])
     90 #define RS_STATE_RUNNING(a) (ipv6nd_hasra((a)) && ipv6nd_dadcompleted((a)))
     91 
     92 #ifndef MAX_RTR_SOLICITATION_DELAY
     93 #define MAX_RTR_SOLICITATION_DELAY 1 /* seconds */
     94 #define MAX_UNICAST_SOLICIT	   3 /* 3 transmissions */
     95 #define RTR_SOLICITATION_INTERVAL  4 /* seconds */
     96 #define MAX_RTR_SOLICITATIONS	   3 /* times */
     97 #define MAX_NEIGHBOR_ADVERTISEMENT 3 /* 3 transmissions */
     98 
     99 #ifndef IPV6_DEFHLIM
    100 #define IPV6_DEFHLIM 64
    101 #endif
    102 #endif
    103 
    104 /* On carrier up, expire known routers after RTR_CARRIER_EXPIRE seconds. */
    105 #define RTR_CARRIER_EXPIRE            \
    106 	(MAX_RTR_SOLICITATION_DELAY + \
    107 	    (MAX_RTR_SOLICITATIONS + 1) * RTR_SOLICITATION_INTERVAL)
    108 
    109 #define MAX_REACHABLE_TIME     3600000 /* milliseconds */
    110 #define REACHABLE_TIME	       30000   /* milliseconds */
    111 #define RETRANS_TIMER	       1000    /* milliseconds */
    112 #define DELAY_FIRST_PROBE_TIME 5       /* seconds */
    113 
    114 #define MIN_EXTENDED_VLTIME    7200 /* seconds */
    115 
    116 int ipv6nd_open(bool);
    117 #ifdef __sun
    118 int ipv6nd_openif(unsigned int);
    119 #endif
    120 void ipv6nd_recvmsg(struct dhcpcd_ctx *, struct msghdr *);
    121 int ipv6nd_rtpref(uint8_t);
    122 void ipv6nd_printoptions(const struct dhcpcd_ctx *, const struct dhcp_opt *,
    123     size_t);
    124 void ipv6nd_startrs(struct interface *);
    125 ssize_t ipv6nd_env(FILE *, const struct interface *);
    126 const struct ipv6_addr *ipv6nd_iffindaddr(const struct interface *ifp,
    127     const struct in6_addr *addr, unsigned int flags);
    128 struct ipv6_addr *ipv6nd_findaddr(struct dhcpcd_ctx *, const struct in6_addr *,
    129     unsigned int);
    130 struct ipv6_addr *ipv6nd_iffindprefix(struct interface *,
    131     const struct in6_addr *, uint8_t);
    132 ssize_t ipv6nd_free(struct interface *);
    133 void ipv6nd_expirera(void *arg);
    134 bool ipv6nd_hasralifetime(const struct interface *, bool);
    135 #define ipv6nd_hasra(i) ipv6nd_hasralifetime((i), false)
    136 bool ipv6nd_hasradhcp(const struct interface *, bool);
    137 void ipv6nd_handleifa(int, struct ipv6_addr *, pid_t);
    138 int ipv6nd_dadcompleted(const struct interface *);
    139 void ipv6nd_advertise(struct ipv6_addr *);
    140 void ipv6nd_startexpire(struct interface *);
    141 void ipv6nd_drop(struct interface *);
    142 void ipv6nd_neighbour(struct dhcpcd_ctx *, struct in6_addr *, bool);
    143 void ipv6nd_abort(struct interface *);
    144 #endif /* INET6 */
    145 
    146 #endif /* IPV6ND_H */
    147