2a95e63343
The patch implements Default Router Preferences and More-Specific Routes (RFC 4191) for RAdv protocol, allowing to announce router preference and more specific routes in router advertisements. Routes can be exported to RAdv like to regular routing protocols. Some cleanups, bugfixes and other changes done by Ondrej Zajicek.
219 lines
6.5 KiB
C
219 lines
6.5 KiB
C
/*
|
|
* BIRD -- Router Advertisement
|
|
*
|
|
*
|
|
* 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
|
|
|
|
#define DEFAULT_MAX_RA_INT 600
|
|
#define DEFAULT_MIN_DELAY 3
|
|
#define DEFAULT_CURRENT_HOP_LIMIT 64
|
|
#define DEFAULT_LINGER_TIME 300
|
|
|
|
#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) */
|
|
|
|
ip_addr trigger_prefix; /* Prefix of a trigger route, if defined */
|
|
u8 trigger_pxlen; /* Pxlen of a trigger route, if defined */
|
|
u8 trigger_valid; /* Whether a trigger route is defined */
|
|
u8 propagate_routes; /* Do we propagate more specific routes (RFC 4191)? */
|
|
u32 route_lifetime; /* Lifetime for the RFC 4191 routes */
|
|
u32 route_lifetime_sensitive; /* Whether route_lifetime depends on trigger */
|
|
u32 route_linger_time; /* For how long we advertise dead routes with lifetime = 0 */
|
|
};
|
|
|
|
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;
|
|
|
|
u32 linger_time; /* How long a dead prefix should still be advertised with 0
|
|
lifetime */
|
|
|
|
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;
|
|
u8 default_lifetime_sensitive; /* Whether default_lifetime depends on trigger */
|
|
u8 default_preference; /* Default Router Preference (RFC 4191) */
|
|
};
|
|
|
|
struct radv_prefix_config
|
|
{
|
|
node n;
|
|
ip_addr prefix;
|
|
uint pxlen;
|
|
|
|
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 */
|
|
ip_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
|
|
{
|
|
struct fib_node n;
|
|
u32 lifetime; /* Lifetime from an attribute */
|
|
u8 lifetime_set; /* Is the lifetime set by an attribute? */
|
|
u8 preference; /* Preference of the route, RA_PREF_* */
|
|
u8 alive;
|
|
bird_clock_t expires; /* Time to remove when !alive */
|
|
};
|
|
|
|
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) */
|
|
bird_clock_t prune_time; /* Next time of route table pruning */
|
|
};
|
|
|
|
struct radv_prefix /* One prefix we advertise */
|
|
{
|
|
node n;
|
|
ip_addr prefix;
|
|
u8 len;
|
|
u8 alive; /* Is the prefix alive? If not, we advertise it
|
|
with 0 lifetime, so clients stop using it */
|
|
u8 mark; /* A temporary mark for processing */
|
|
bird_clock_t expires; /* The time when we drop this prefix from
|
|
advertising. It is valid only if !alive. */
|
|
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) */
|
|
bird_clock_t prune_time; /* Next time of prefix list pruning */
|
|
|
|
timer *timer;
|
|
struct object_lock *lock;
|
|
sock *sk;
|
|
|
|
bird_clock_t 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(EAP_RADV, 0)
|
|
#define EA_RA_LIFETIME EA_CODE(EAP_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)
|
|
|
|
|
|
/* 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);
|
|
int radv_sk_open(struct radv_iface *ifa);
|
|
|
|
|
|
|
|
#endif /* _BIRD_RADV_H_ */
|