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