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bird 1.6.3

    1: /*
    2:  *	BIRD -- Router Advertisement
    3:  *
    4:  *
    5:  *	Can be freely distributed and used under the terms of the GNU GPL.
    6:  */
    7: 
    8: #ifndef _BIRD_RADV_H_
    9: #define _BIRD_RADV_H_
   10: 
   11: #include "nest/bird.h"
   12: 
   13: #include "lib/ip.h"
   14: #include "lib/lists.h"
   15: #include "lib/socket.h"
   16: #include "lib/timer.h"
   17: #include "lib/resource.h"
   18: #include "nest/protocol.h"
   19: #include "nest/iface.h"
   20: #include "nest/route.h"
   21: #include "nest/cli.h"
   22: #include "nest/locks.h"
   23: #include "conf/conf.h"
   24: #include "lib/string.h"
   25: 
   26: 
   27: #define ICMPV6_PROTO 58
   28: 
   29: #define ICMPV6_RS 133
   30: #define ICMPV6_RA 134
   31: 
   32: #define MAX_INITIAL_RTR_ADVERTISEMENTS 3
   33: #define MAX_INITIAL_RTR_ADVERT_INTERVAL 16
   34: 
   35: #define DEFAULT_MAX_RA_INT 600
   36: #define DEFAULT_MIN_DELAY 3
   37: #define DEFAULT_CURRENT_HOP_LIMIT 64
   38: 
   39: #define DEFAULT_VALID_LIFETIME 86400
   40: #define DEFAULT_PREFERRED_LIFETIME 14400
   41: 
   42: #define DEFAULT_DNS_LIFETIME_MULT 3
   43: 
   44: 
   45: struct radv_config
   46: {
   47:   struct proto_config c;
   48:   list patt_list;		/* List of iface configs (struct radv_iface_config) */
   49:   list pref_list;		/* Global list of prefix configs (struct radv_prefix_config) */
   50:   list rdnss_list;		/* Global list of RDNSS configs (struct radv_rdnss_config) */
   51:   list dnssl_list;		/* Global list of DNSSL configs (struct radv_dnssl_config) */
   52: 
   53:   ip_addr trigger_prefix;	/* Prefix of a trigger route, if defined */
   54:   u8 trigger_pxlen;		/* Pxlen of a trigger route, if defined */
   55:   u8 trigger_valid;		/* Whether a trigger route is defined */
   56: };
   57: 
   58: struct radv_iface_config
   59: {
   60:   struct iface_patt i;
   61:   list pref_list;		/* Local list of prefix configs (struct radv_prefix_config) */
   62:   list rdnss_list;		/* Local list of RDNSS configs (struct radv_rdnss_config) */
   63:   list dnssl_list;		/* Local list of DNSSL configs (struct radv_dnssl_config) */
   64: 
   65:   u32 min_ra_int;		/* Standard options from RFC 4261 */
   66:   u32 max_ra_int;
   67:   u32 min_delay;
   68: 
   69:   u8 rdnss_local;		/* Global list is not used for RDNSS */
   70:   u8 dnssl_local;		/* Global list is not used for DNSSL */
   71: 
   72:   u8 managed;			/* Standard options from RFC 4261 */
   73:   u8 other_config;
   74:   u32 link_mtu;
   75:   u32 reachable_time;
   76:   u32 retrans_timer;
   77:   u32 current_hop_limit;
   78:   u32 default_lifetime;
   79:   u8 default_lifetime_sensitive; /* Whether default_lifetime depends on trigger */
   80:   u8 default_preference;	/* Default Router Preference (RFC 4191) */
   81: };
   82: 
   83: struct radv_prefix_config
   84: {
   85:   node n;
   86:   ip_addr prefix;
   87:   uint pxlen;
   88: 
   89:   u8 skip;			/* Do not include this prefix to RA */
   90:   u8 onlink;			/* Standard options from RFC 4261 */
   91:   u8 autonomous;
   92:   u32 valid_lifetime;
   93:   u32 preferred_lifetime;
   94:   u8 valid_lifetime_sensitive;	 /* Whether valid_lifetime depends on trigger */
   95:   u8 preferred_lifetime_sensitive; /* Whether preferred_lifetime depends on trigger */
   96: };
   97: 
   98: struct radv_rdnss_config
   99: {
  100:   node n;
  101:   u32 lifetime;			/* Valid if lifetime_mult is 0 */
  102:   u16 lifetime_mult;		/* Lifetime specified as multiple of max_ra_int */
  103:   ip_addr server;		/* IP address of recursive DNS server */
  104: };
  105: 
  106: struct radv_dnssl_config
  107: {
  108:   node n;
  109:   u32 lifetime;			/* Valid if lifetime_mult is 0 */
  110:   u16 lifetime_mult;		/* Lifetime specified as multiple of max_ra_int */
  111:   u8 dlen_first;		/* Length of first label in domain */
  112:   u8 dlen_all;			/* Both dlen_ filled in radv_process_domain() */
  113:   char *domain;			/* Domain for DNS search list, in processed form */
  114: };
  115: 
  116: 
  117: struct proto_radv
  118: {
  119:   struct proto p;
  120:   list iface_list;		/* List of active ifaces */
  121:   u8 active;			/* Whether radv is active w.r.t. triggers */
  122: };
  123: 
  124: struct radv_iface
  125: {
  126:   node n;
  127:   struct proto_radv *ra;
  128:   struct radv_iface_config *cf;	/* Related config, must be updated in reconfigure */
  129:   struct iface *iface;
  130:   struct ifa *addr;		/* Link-local address of iface */
  131: 
  132:   timer *timer;
  133:   struct object_lock *lock;
  134:   sock *sk;
  135: 
  136:   bird_clock_t last;		/* Time of last sending of RA */
  137:   u16 plen;			/* Length of prepared RA in tbuf, or 0 if not valid */
  138:   byte initial;			/* List of active ifaces */
  139: };
  140: 
  141: #define RA_EV_INIT 1		/* Switch to initial mode */
  142: #define RA_EV_CHANGE 2		/* Change of options or prefixes */
  143: #define RA_EV_RS 3		/* Received RS */
  144: 
  145: /* Default Router Preferences (RFC 4191) */
  146: #define RA_PREF_LOW	0x18
  147: #define RA_PREF_MEDIUM	0x00
  148: #define RA_PREF_HIGH	0x08
  149: #define RA_PREF_MASK	0x18
  150: 
  151: 
  152: #ifdef LOCAL_DEBUG
  153: #define RADV_FORCE_DEBUG 1
  154: #else
  155: #define RADV_FORCE_DEBUG 0
  156: #endif
  157: #define RADV_TRACE(flags, msg, args...) do { if ((ra->p.debug & flags) || RADV_FORCE_DEBUG) \
  158: 	log(L_TRACE "%s: " msg, ra->p.name , ## args ); } while(0)
  159: 
  160: 
  161: /* radv.c */
  162: void radv_iface_notify(struct radv_iface *ifa, int event);
  163: 
  164: /* packets.c */
  165: int radv_process_domain(struct radv_dnssl_config *cf);
  166: void radv_send_ra(struct radv_iface *ifa, int shutdown);
  167: int radv_sk_open(struct radv_iface *ifa);
  168: 
  169: 
  170: 
  171: #endif /* _BIRD_RADV_H_ */