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/*
* BIRD -- Router Advertisement
*
* (c) 2011--2019 Ondrej Zajicek <santiago@crfreenet.org>
* (c) 2011--2019 CZ.NIC z.s.p.o.
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
#ifndef _BIRD_RADV_H_
#define _BIRD_RADV_H_
#include "nest/bird.h"
#include "lib/ip.h"
#include "lib/lists.h"
#include "lib/socket.h"
#include "lib/timer.h"
#include "lib/resource.h"
#include "nest/protocol.h"
#include "nest/iface.h"
#include "nest/route.h"
#include "nest/cli.h"
#include "nest/locks.h"
#include "conf/conf.h"
#include "lib/string.h"
#define ICMPV6_PROTO 58
#define ICMPV6_RS 133
#define ICMPV6_RA 134
#define MAX_INITIAL_RTR_ADVERTISEMENTS 3
#define MAX_INITIAL_RTR_ADVERT_INTERVAL (16 S_)
#define DEFAULT_MAX_RA_INT 600
#define DEFAULT_MIN_DELAY 3
#define DEFAULT_CURRENT_HOP_LIMIT 64
#define DEFAULT_VALID_LIFETIME 86400
#define DEFAULT_PREFERRED_LIFETIME 14400
#define DEFAULT_DNS_LIFETIME_MULT 3
struct radv_config
{
struct proto_config c;
list patt_list; /* List of iface configs (struct radv_iface_config) */
list pref_list; /* Global list of prefix configs (struct radv_prefix_config) */
list rdnss_list; /* Global list of RDNSS configs (struct radv_rdnss_config) */
list dnssl_list; /* Global list of DNSSL configs (struct radv_dnssl_config) */
net_addr trigger; /* Prefix of a trigger route, if defined */
u8 propagate_routes; /* Do we propagate more specific routes (RFC 4191)? */
u32 max_linger_time; /* Maximum of interface route_linger_time */
};
struct radv_iface_config
{
struct iface_patt i;
list pref_list; /* Local list of prefix configs (struct radv_prefix_config) */
list rdnss_list; /* Local list of RDNSS configs (struct radv_rdnss_config) */
list dnssl_list; /* Local list of DNSSL configs (struct radv_dnssl_config) */
u32 min_ra_int; /* Standard options from RFC 4861 */
u32 max_ra_int;
u32 min_delay;
u8 solicited_ra_unicast; /* Send solicited RAs as unicast */
u32 prefix_linger_time; /* How long we advertise dead prefixes with lifetime 0 */
u32 route_linger_time; /* How long we advertise dead routes with lifetime 0 */
u8 rdnss_local; /* Global list is not used for RDNSS */
u8 dnssl_local; /* Global list is not used for DNSSL */
u8 managed; /* Standard options from RFC 4861 */
u8 other_config;
u32 link_mtu;
u32 reachable_time;
u32 retrans_timer;
u32 current_hop_limit;
u32 default_lifetime;
u32 route_lifetime; /* Lifetime for the RFC 4191 routes */
u8 default_lifetime_sensitive; /* Whether default_lifetime depends on trigger */
u8 route_lifetime_sensitive; /* Whether route_lifetime depends on trigger */
u8 default_preference; /* Default Router Preference (RFC 4191) */
u8 route_preference; /* Specific Route Preference (RFC 4191) */
};
struct radv_prefix_config
{
node n;
net_addr_ip6 prefix;
u8 skip; /* Do not include this prefix to RA */
u8 onlink; /* Standard options from RFC 4861 */
u8 autonomous;
u32 valid_lifetime;
u32 preferred_lifetime;
u8 valid_lifetime_sensitive; /* Whether valid_lifetime depends on trigger */
u8 preferred_lifetime_sensitive; /* Whether preferred_lifetime depends on trigger */
};
struct radv_rdnss_config
{
node n;
u32 lifetime; /* Valid if lifetime_mult is 0 */
u16 lifetime_mult; /* Lifetime specified as multiple of max_ra_int */
ip6_addr server; /* IP address of recursive DNS server */
};
struct radv_dnssl_config
{
node n;
u32 lifetime; /* Valid if lifetime_mult is 0 */
u16 lifetime_mult; /* Lifetime specified as multiple of max_ra_int */
u8 dlen_first; /* Length of first label in domain */
u8 dlen_all; /* Both dlen_ filled in radv_process_domain() */
char *domain; /* Domain for DNS search list, in processed form */
};
/*
* One more specific route as per RFC 4191.
*
* Note that it does *not* contain the next hop field. The next hop is always
* the router sending the advertisment and the more specific route only allows
* overriding the preference of the route.
*/
struct radv_route
{
u32 lifetime; /* Lifetime from an attribute */
u8 lifetime_set; /* Whether lifetime is defined */
u8 preference; /* Preference of the route, RA_PREF_* */
u8 preference_set; /* Whether preference is defined */
u8 valid; /* Whethe route is valid or withdrawn */
btime changed; /* Last time when the route changed */
struct fib_node n;
};
struct radv_proto
{
struct proto p;
list iface_list; /* List of active ifaces */
u8 valid; /* Router is valid for forwarding, used for shutdown */
u8 active; /* Whether radv is active w.r.t. triggers */
u8 fib_up; /* FIB table (routes) is initialized */
struct fib routes; /* FIB table of specific routes (struct radv_route) */
btime prune_time; /* Next time of route table pruning */
};
struct radv_prefix /* One prefix we advertise */
{
node n;
net_addr_ip6 prefix;
u8 valid; /* Is the prefix valid? If not, we advertise it
with 0 lifetime, so clients stop using it */
u8 mark; /* A temporary mark for processing */
btime changed; /* Last time when the prefix changed */
struct radv_prefix_config *cf; /* The config tied to this prefix */
};
struct radv_iface
{
node n;
struct radv_proto *ra;
struct radv_iface_config *cf; /* Related config, must be updated in reconfigure */
struct iface *iface;
struct ifa *addr; /* Link-local address of iface */
struct pool *pool; /* A pool for interface-specific things */
list prefixes; /* The prefixes we advertise (struct radv_prefix) */
btime prune_time; /* Next time of prefix list pruning */
btime valid_time; /* Cached packet is valid until first linger timeout */
timer *timer;
struct object_lock *lock;
sock *sk;
btime last; /* Time of last sending of RA */
u16 plen; /* Length of prepared RA in tbuf, or 0 if not valid */
byte initial; /* How many RAs are still to be sent as initial */
};
#define RA_EV_INIT 1 /* Switch to initial mode */
#define RA_EV_CHANGE 2 /* Change of options or prefixes */
#define RA_EV_RS 3 /* Received RS */
/* Default Router Preferences (RFC 4191) */
#define RA_PREF_LOW 0x18
#define RA_PREF_MEDIUM 0x00
#define RA_PREF_HIGH 0x08
#define RA_PREF_MASK 0x18
/* Attributes */
#define EA_RA_PREFERENCE EA_CODE(PROTOCOL_RADV, 0)
#define EA_RA_LIFETIME EA_CODE(PROTOCOL_RADV, 1)
#ifdef LOCAL_DEBUG
#define RADV_FORCE_DEBUG 1
#else
#define RADV_FORCE_DEBUG 0
#endif
#define RADV_TRACE(flags, msg, args...) do { if ((p->p.debug & flags) || RADV_FORCE_DEBUG) \
log(L_TRACE "%s: " msg, p->p.name , ## args ); } while(0)
/* Invalidate cached RA packet */
static inline void radv_invalidate(struct radv_iface *ifa)
{ ifa->plen = 0; }
/* radv.c */
void radv_iface_notify(struct radv_iface *ifa, int event);
/* packets.c */
int radv_process_domain(struct radv_dnssl_config *cf);
void radv_send_ra(struct radv_iface *ifa, ip_addr to);
int radv_sk_open(struct radv_iface *ifa);
#endif /* _BIRD_RADV_H_ */
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