/*      $OpenBSD: rad.h,v 1.31 2026/02/26 07:17:50 florian Exp $        */

/*
 * Copyright (c) 2018 Florian Obser <florian@openbsd.org>
 * Copyright (c) 2004 Esben Norby <norby@openbsd.org>
 * Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#define _PATH_CONF_FILE         "/etc/rad.conf"
#define _PATH_RAD_SOCKET        "/var/run/rad.sock"
#define RAD_USER                "_rad"

#define OPT_VERBOSE     0x00000001
#define OPT_VERBOSE2    0x00000002
#define OPT_NOACTION    0x00000004

#define MAX_RTR_ADV_INTERVAL    600
#define MIN_RTR_ADV_INTERVAL    200
#define ADV_PREFERRED_LIFETIME  2700    /* 45 minutes */
#define ADV_VALID_LIFETIME      3600    /* 60 minutes */
#define ADV_DEFAULT_LIFETIME    ADV_VALID_LIFETIME
#define MAX_RA_DELAY_TIME       500     /* 500 milliseconds */
#define MIN_DELAY_BETWEEN_RAS   3       /* 3 seconds */
#define MAX_SEARCH              1025    /* MAXDNAME in arpa/nameser.h */

#define IMSG_DATA_SIZE(imsg)    ((imsg).hdr.len - IMSG_HEADER_SIZE)

struct imsgev {
        struct imsgbuf   ibuf;
        void            (*handler)(int, short, void *);
        struct event     ev;
        short            events;
};

enum imsg_type {
        IMSG_NONE,
        IMSG_CTL_LOG_VERBOSE,
        IMSG_CTL_RELOAD,
        IMSG_RECONF_CONF,
        IMSG_RECONF_RA_IFACE,
        IMSG_RECONF_RA_AUTOPREFIX,
        IMSG_RECONF_RA_PREFIX,
        IMSG_RECONF_RA_RDNSS,
        IMSG_RECONF_RA_DNSSL,
        IMSG_RECONF_RA_PREF64,
        IMSG_RECONF_END,
        IMSG_ICMP6SOCK,
        IMSG_OPEN_ICMP6SOCK,
        IMSG_ROUTESOCK,
        IMSG_CONTROLFD,
        IMSG_STARTUP,
        IMSG_RA_RS,
        IMSG_SEND_RA,
        IMSG_UPDATE_IF,
        IMSG_REMOVE_IF,
        IMSG_SOCKET_IPC
};

/* RFC 8106 */
struct ra_rdnss_conf {
        SIMPLEQ_ENTRY(ra_rdnss_conf)    entry;
        struct in6_addr                 rdnss;
};
struct ra_dnssl_conf {
        SIMPLEQ_ENTRY(ra_dnssl_conf)    entry;
        char                            search[MAX_SEARCH];
};

/* RFC 8781 Section 4 */
struct ra_pref64_conf {
        SIMPLEQ_ENTRY(ra_pref64_conf)    entry;
        struct in6_addr                  prefix;        /* prefix */
        int                              prefixlen;     /* prefix length */
        uint32_t                         ltime;         /* lifetime */
};

/* RFC 4861 Sections 4.2 and 4.6.4 */
struct ra_options_conf {
        int             dfr;                    /* is default router? */
        int             cur_hl;                 /* current hop limit */
        int             m_flag;                 /* managed address conf flag */
        int             o_flag;                 /* other conf flag */
        int             rtpref;                 /* router preference */
        int             router_lifetime;        /* default router lifetime */
        uint32_t        reachable_time;
        uint32_t        retrans_timer;
        int             source_link_addr;       /* source link-layer address */
        uint32_t        mtu;
        uint32_t        rdns_lifetime;
        SIMPLEQ_HEAD(, ra_rdnss_conf)            ra_rdnss_list;
        int             rdnss_count;
        SIMPLEQ_HEAD(, ra_dnssl_conf)            ra_dnssl_list;
        int             dnssl_len;
        SIMPLEQ_HEAD(, ra_pref64_conf)           ra_pref64_list;
};

/* RFC 4861 Section 4.6.2 */
struct ra_prefix_conf {
        SIMPLEQ_ENTRY(ra_prefix_conf)    entry;
        struct in6_addr                  prefix;        /* prefix */
        int                              prefixlen;     /* prefix length */
        uint32_t                         vltime;        /* valid lifetime */
        uint32_t                         pltime;        /* preferred lifetime */
        uint32_t                         if_vltime;     /* valid lifetime */
        uint32_t                         if_pltime;     /* preferred lifetime */
        int                              autoconf;
        int                              lflag;         /* on-link flag*/
        int                              aflag;         /* autonom. addr flag */
};

struct ra_iface_conf {
        SIMPLEQ_ENTRY(ra_iface_conf)             entry;
        struct ra_options_conf                   ra_options;
        struct ra_prefix_conf                   *autoprefix;
        SIMPLEQ_HEAD(ra_prefix_conf_head,
            ra_prefix_conf)                      ra_prefix_list;
        char                                     name[IF_NAMESIZE];
};

struct rad_conf {
        struct ra_options_conf                           ra_options;
        SIMPLEQ_HEAD(ra_iface_conf_head, ra_iface_conf)  ra_iface_list;
};

struct imsg_ra_rs {
        uint32_t                if_index;
        struct sockaddr_in6     from;
        ssize_t                 len;
        uint8_t                 packet[1500];
};

struct imsg_send_ra {
        uint32_t                if_index;
        struct sockaddr_in6     to;
};

extern uint32_t  cmd_opts;

/* rad.c */
int     main_imsg_compose_frontend(int, int, void *, uint16_t);
void    main_imsg_compose_engine(int, pid_t, void *, uint16_t);
void    merge_config(struct rad_conf *, struct rad_conf *);
void    imsg_event_add(struct imsgev *);
int     imsg_compose_event(struct imsgev *, uint16_t, uint32_t, pid_t,
            int, void *, uint16_t);

struct rad_conf *config_new_empty(void);
void             config_clear(struct rad_conf *);
void             free_ra_iface_conf(struct ra_iface_conf *);
void             free_dns_options(struct ra_options_conf *);
void             mask_prefix(struct in6_addr*, int len);
const char      *sin6_to_str(struct sockaddr_in6 *);
const char      *in6_to_str(struct in6_addr *);

/* printconf.c */
void    print_config(struct rad_conf *);

/* parse.y */
struct rad_conf *parse_config(char *);
int                      cmdline_symset(char *);