RAdv: Change specific route options to be per-interface

And change default values of specific route options to be consistent with
values of default router options.

proto/radv/config.Y

@@ -48,8 +48,6 @@ radv_proto_start: proto_start RADV
   init_list(&RADV_CFG->pref_list);
   init_list(&RADV_CFG->rdnss_list);
   init_list(&RADV_CFG->dnssl_list);
-  RADV_CFG->route_lifetime = DEFAULT_VALID_LIFETIME;
-  RADV_CFG->route_linger_time = DEFAULT_LINGER_TIME;
 };
 
 radv_proto_item:
@@ -64,15 +62,6 @@ radv_proto_item:
      RADV_CFG->trigger_valid = 1;
    }
  | PROPAGATE ROUTES bool { RADV_CFG->propagate_routes = $3; }
- | ROUTE LIFETIME expr radv_sensitive {
-     RADV_CFG->route_lifetime = $3;
-     if ($4 != -1) RADV_CFG->route_lifetime_sensitive = $4;
-   }
- | ROUTE LINGER TIME expr {
-     RADV_CFG->route_linger_time = $4;
-     if (($4 < 0) || ($4 > 3600))
-       cf_error("Linger time must be in range 0-3600");
-   }
  ;
 
 radv_proto_opts:
@@ -96,11 +85,15 @@ radv_iface_start:
   RADV_IFACE->min_ra_int = -1; /* undefined */
   RADV_IFACE->max_ra_int = DEFAULT_MAX_RA_INT;
   RADV_IFACE->min_delay = DEFAULT_MIN_DELAY;
+  RADV_IFACE->prefix_linger_time = -1;
+  RADV_IFACE->route_linger_time = -1;
   RADV_IFACE->current_hop_limit = DEFAULT_CURRENT_HOP_LIMIT;
-  RADV_IFACE->linger_time = DEFAULT_LINGER_TIME;
   RADV_IFACE->default_lifetime = -1;
   RADV_IFACE->default_lifetime_sensitive = 1;
   RADV_IFACE->default_preference = RA_PREF_MEDIUM;
+  RADV_IFACE->route_lifetime = -1;
+  RADV_IFACE->route_lifetime_sensitive = 0;
+  RADV_IFACE->route_preference = RA_PREF_MEDIUM;
 };
 
 radv_iface_item:
@@ -112,14 +105,20 @@ radv_iface_item:
  | LINK MTU expr { RADV_IFACE->link_mtu = $3; if ($3 < 0) cf_error("Link MTU must be 0 or positive"); }
  | REACHABLE TIME expr { RADV_IFACE->reachable_time = $3; if (($3 < 0) || ($3 > 3600000)) cf_error("Reachable time must be in range 0-3600000"); }
  | RETRANS TIMER expr { RADV_IFACE->retrans_timer = $3; if ($3 < 0) cf_error("Retrans timer must be 0 or positive"); }
- | LINGER TIME expr { RADV_IFACE->linger_time = $3; if (($3 < 0) || ($3 > 3600)) cf_error("Linger time must be in range 0-3600"); }
  | CURRENT HOP LIMIT expr { RADV_IFACE->current_hop_limit = $4; if (($4 < 0) || ($4 > 255))  cf_error("Current hop limit must be in range 0-255"); }
  | DEFAULT LIFETIME expr radv_sensitive {
      RADV_IFACE->default_lifetime = $3;
      if (($3 < 0) || ($3 > 9000))  cf_error("Default lifetime must be in range 0-9000");
      if ($4 != -1) RADV_IFACE->default_lifetime_sensitive = $4;
    }
+ | ROUTE LIFETIME expr radv_sensitive {
+     RADV_IFACE->route_lifetime = $3;
+     if ($4 != -1) RADV_IFACE->route_lifetime_sensitive = $4;
+   }
  | DEFAULT PREFERENCE radv_preference { RADV_IFACE->default_preference = $3; }
+ | ROUTE PREFERENCE radv_preference { RADV_IFACE->route_preference = $3; }
+ | PREFIX LINGER TIME expr { RADV_IFACE->prefix_linger_time = $4; }
+ | ROUTE LINGER TIME expr { RADV_IFACE->route_linger_time = $4; }
  | PREFIX radv_prefix { add_tail(&RADV_IFACE->pref_list, NODE this_radv_prefix); }
  | RDNSS { init_list(&radv_dns_list); } radv_rdnss { add_tail_list(&RADV_IFACE->rdnss_list, &radv_dns_list); }
  | DNSSL { init_list(&radv_dns_list); } radv_dnssl { add_tail_list(&RADV_IFACE->dnssl_list, &radv_dns_list); }
@@ -142,12 +141,32 @@ radv_iface_finish:
   if (ic->default_lifetime == (u32) -1)
     ic->default_lifetime = 3 * ic->max_ra_int;
 
+  if (ic->route_lifetime == (u32) -1)
+    ic->route_lifetime = 3 * ic->max_ra_int;
+
+  if (ic->prefix_linger_time == (u32) -1)
+    ic->prefix_linger_time = 3 * ic->max_ra_int;
+
+  if (ic->route_linger_time == (u32) -1)
+    ic->route_linger_time = 3 * ic->max_ra_int;
+
   if ((ic->min_ra_int > 3) &&
       (ic->min_ra_int > (ic->max_ra_int * 3 / 4)))
     cf_error("Min RA interval must be at most 3/4 * Max RA interval %d %d", ic->min_ra_int, ic->max_ra_int);
 
   if ((ic->default_lifetime > 0) && (ic->default_lifetime < ic->max_ra_int))
     cf_error("Default lifetime must be either 0 or at least Max RA interval");
+
+  if ((ic->route_lifetime > 0) && (ic->route_lifetime < ic->max_ra_int))
+    cf_error("Route lifetime must be either 0 or at least Max RA interval");
+
+  if ((ic->prefix_linger_time > 0) && (ic->prefix_linger_time < ic->max_ra_int))
+    cf_error("Prefix linger time must be either 0 or at least Max RA interval");
+
+  if ((ic->route_linger_time > 0) && (ic->route_linger_time < ic->max_ra_int))
+    cf_error("Route linger time must be either 0 or at least Max RA interval");
+
+  RADV_CFG->max_linger_time = MAX_(RADV_CFG->max_linger_time, ic->route_linger_time);
 };
 
 

proto/radv/packets.c

@@ -85,7 +85,6 @@ radv_prepare_route(struct radv_iface *ifa, struct radv_route *rt,
 		   char **buf, char *bufend)
 {
   struct radv_proto *p = ifa->ra;
-  struct radv_config *cf = (void *) p->p.cf;
   u8 px_blocks = (rt->n.pxlen + 63) / 64;
   u8 opt_len = 8 * (1 + px_blocks);
 
@@ -96,22 +95,26 @@ radv_prepare_route(struct radv_iface *ifa, struct radv_route *rt,
     return -1;
   }
 
+  uint preference = rt->preference_set ? rt->preference : ifa->cf->route_preference;
+  uint lifetime = rt->lifetime_set ? rt->lifetime : ifa->cf->route_lifetime;
+  uint valid = rt->valid && p->valid && (p->active || !ifa->cf->route_lifetime_sensitive);
+
   struct radv_opt_route *opt = (void *) *buf;
   *buf += opt_len;
   opt->type = OPT_ROUTE;
   opt->length = 1 + px_blocks;
   opt->pxlen = rt->n.pxlen;
-  opt->flags = rt->preference;
-
-  if (p->valid && (p->active || !cf->route_lifetime_sensitive) && rt->alive)
-    opt->lifetime = htonl(rt->lifetime_set ? rt->lifetime : cf->route_lifetime);
-  else
-    opt->lifetime = 0;
+  opt->flags = preference;
+  opt->lifetime = valid ? htonl(lifetime) : 0;
 
   /* Copy the relevant part of the prefix */
   ip6_addr px_addr = ip6_hton(rt->n.prefix);
   memcpy(opt->prefix, &px_addr, 8 * px_blocks);
 
+  /* Keeping track of first linger timeout */
+  if (!rt->valid)
+    ifa->valid_time = MIN(ifa->valid_time, rt->changed + ifa->cf->route_linger_time);
+
   return 0;
 }
 
@@ -278,6 +281,10 @@ radv_prepare_prefix(struct radv_iface *ifa, struct radv_prefix *prefix,
   ipa_hton(op->prefix);
   *buf += sizeof(*op);
 
+  /* Keeping track of first linger timeout */
+  if (!prefix->valid)
+    ifa->valid_time = MIN(ifa->valid_time, prefix->changed + ifa->cf->prefix_linger_time);
+
   return 0;
 }
 
@@ -316,10 +323,17 @@ radv_prepare_ra(struct radv_iface *ifa)
     buf += sizeof (*om);
   }
 
-  struct radv_prefix *prefix;
-  WALK_LIST(prefix, ifa->prefixes)
+  /* Keeping track of first linger timeout */
+  ifa->valid_time = TIME_INFINITY;
+
+  struct radv_prefix *px;
+  WALK_LIST(px, ifa->prefixes)
   {
-    if (radv_prepare_prefix(ifa, prefix, &buf, bufend) < 0)
+    /* Skip invalid prefixes that are past linger timeout but still not pruned */
+    if (!px->valid && (px->changed + ic->prefix_linger_time <= now))
+	continue;
+
+    if (radv_prepare_prefix(ifa, px, &buf, bufend) < 0)
       goto done;
   }
 
@@ -339,9 +353,15 @@ radv_prepare_ra(struct radv_iface *ifa)
 
   if (p->fib_up)
   {
-    FIB_WALK(&p->routes, rt)
+    FIB_WALK(&p->routes, n)
     {
-      if (radv_prepare_route(ifa, (struct radv_route *) rt, &buf, bufend) < 0)
+      struct radv_route *rt = (void *) n;
+
+      /* Skip invalid routes that are past linger timeout but still not pruned */
+      if (!rt->valid && (rt->changed + ic->route_linger_time <= now))
+	continue;
+
+      if (radv_prepare_route(ifa, rt, &buf, bufend) < 0)
 	goto done;
     }
     FIB_WALK_END;

proto/radv/radv.c

@@ -55,6 +55,9 @@ radv_timer(timer *tm)
 
   RADV_TRACE(D_EVENTS, "Timer fired on %s", ifa->iface->name);
 
+  if (ifa->valid_time <= now)
+    radv_invalidate(ifa);
+
   if (ifa->prune_time <= now)
     radv_prune_prefixes(ifa);
 
@@ -117,7 +120,6 @@ static void
 radv_prepare_prefixes(struct radv_iface *ifa)
 {
   struct radv_proto *p = ifa->ra;
-  struct radv_iface_config *cf = ifa->cf;
   struct radv_prefix *pfx, *next;
 
   /* First mark all the prefixes as unused */
@@ -157,20 +159,21 @@ radv_prepare_prefixes(struct radv_iface *ifa)
      * Update the information (it may have changed, or even bring a prefix back
      * to life).
      */
-    existing->alive = 1;
+    existing->valid = 1;
+    existing->changed = now;
     existing->mark = 1;
     existing->cf = pc;
   }
 
   WALK_LIST_DELSAFE(pfx, next, ifa->prefixes)
   {
-    if (pfx->alive && !pfx->mark)
+    if (pfx->valid && !pfx->mark)
     {
       RADV_TRACE(D_EVENTS, "Invalidating prefix %I/$d on %s",
 		 pfx->prefix, pfx->len, ifa->iface->name);
 
-      pfx->alive = 0;
-      pfx->expires = now + cf->linger_time;
+      pfx->valid = 0;
+      pfx->changed = now;
       pfx->cf = &dead_prefix;
     }
   }
@@ -181,30 +184,28 @@ radv_prune_prefixes(struct radv_iface *ifa)
 {
   struct radv_proto *p = ifa->ra;
   bird_clock_t next = TIME_INFINITY;
-  int changed = 0;
+  bird_clock_t expires = 0;
 
   struct radv_prefix *px, *pxn;
   WALK_LIST_DELSAFE(px, pxn, ifa->prefixes)
   {
-    if (!px->alive)
+    if (!px->valid)
     {
-      if (px->expires <= now)
+      expires = px->changed + ifa->cf->prefix_linger_time;
+
+      if (expires <= now)
       {
 	RADV_TRACE(D_EVENTS, "Removing prefix %I/%d on %s",
 		   px->prefix, px->len, ifa->iface->name);
 
 	rem_node(NODE px);
 	mb_free(px);
-	changed = 1;
       }
       else
-	next = MIN(next, px->expires);
+	next = MIN(next, expires);
     }
   }
 
-  if (changed)
-    radv_invalidate(ifa);
-
   ifa->prune_time = next;
 }
 
@@ -424,6 +425,7 @@ radv_rt_notify(struct proto *P, rtable *tbl UNUSED, net *n, rte *new, rte *old U
   struct radv_proto *p = (struct radv_proto *) P;
   struct radv_config *cf = (struct radv_config *) (P->cf);
   struct radv_route *rt;
+  eattr *ea;
 
   if (radv_net_match_trigger(cf, n))
   {
@@ -455,9 +457,14 @@ radv_rt_notify(struct proto *P, rtable *tbl UNUSED, net *n, rte *new, rte *old U
   if (new)
   {
     /* Update */
-    uint preference = ea_get_int(attrs, EA_RA_PREFERENCE, RA_PREF_MEDIUM);
-    uint lifetime = ea_get_int(attrs, EA_RA_LIFETIME, 0);
-    uint lifetime_set = !!ea_find(attrs, EA_RA_LIFETIME);
+
+    ea = ea_find(attrs, EA_RA_PREFERENCE);
+    uint preference = ea ? ea->u.data : RA_PREF_MEDIUM;
+    uint preference_set = !!ea;
+
+    ea = ea_find(attrs, EA_RA_LIFETIME);
+    uint lifetime = ea ? ea->u.data : 0;
+    uint lifetime_set = !!ea;
 
     if ((preference != RA_PREF_LOW) &&
 	(preference != RA_PREF_MEDIUM) &&
@@ -466,6 +473,7 @@ radv_rt_notify(struct proto *P, rtable *tbl UNUSED, net *n, rte *new, rte *old U
       log(L_WARN "%s: Invalid ra_preference value %u on route %I/%d",
 	  p->p.name, preference, n->n.prefix, n->n.pxlen);
       preference = RA_PREF_MEDIUM;
+      preference_set = 1;
       lifetime = 0;
       lifetime_set = 1;
     }
@@ -473,8 +481,9 @@ radv_rt_notify(struct proto *P, rtable *tbl UNUSED, net *n, rte *new, rte *old U
     rt = fib_get(&p->routes, &n->n.prefix, n->n.pxlen);
 
     /* Ignore update if nothing changed */
-    if (rt->alive &&
+    if (rt->valid &&
 	(rt->preference == preference) &&
+	(rt->preference_set == preference_set) &&
 	(rt->lifetime == lifetime) &&
 	(rt->lifetime_set == lifetime_set))
       return;
@@ -482,8 +491,10 @@ radv_rt_notify(struct proto *P, rtable *tbl UNUSED, net *n, rte *new, rte *old U
     if (p->routes.entries == 18)
       log(L_WARN "%s: More than 17 routes exported to RAdv", p->p.name);
 
-    rt->alive = 1;
+    rt->valid = 1;
+    rt->changed = now;
     rt->preference = preference;
+    rt->preference_set = preference_set;
     rt->lifetime = lifetime;
     rt->lifetime_set = lifetime_set;
   }
@@ -492,13 +503,16 @@ radv_rt_notify(struct proto *P, rtable *tbl UNUSED, net *n, rte *new, rte *old U
     /* Withdraw */
     rt = fib_find(&p->routes, &n->n.prefix, n->n.pxlen);
 
-    if (!rt || !rt->alive)
+    if (!rt || !rt->valid)
       return;
 
     /* Invalidate the route */
-    rt->alive = 0;
-    rt->expires = now + cf->route_linger_time;
-    p->prune_time = MIN(p->prune_time, rt->expires);
+    rt->valid = 0;
+    rt->changed = now;
+
+    /* Invalidated route will be pruned eventually */
+    bird_clock_t expires = rt->changed + cf->max_linger_time;
+    p->prune_time = MIN(p->prune_time, expires);
   }
 
   radv_iface_notify_all(p, RA_EV_CHANGE);
@@ -511,8 +525,9 @@ radv_rt_notify(struct proto *P, rtable *tbl UNUSED, net *n, rte *new, rte *old U
 static void
 radv_prune_routes(struct radv_proto *p)
 {
+  struct radv_config *cf = (struct radv_config *) (p->p.cf);
   bird_clock_t next = TIME_INFINITY;
-  int changed = 0;
+  bird_clock_t expires = 0;
 
   /* Should not happen */
   if (!p->fib_up)
@@ -526,29 +541,23 @@ again:
   {
     struct radv_route *rt = (void *) node;
 
-    if (!rt->alive)
+    if (!rt->valid)
     {
+      expires = rt->changed + cf->max_linger_time;
+
       /* Delete expired nodes */
-      if (rt->expires <= now)
+      if (expires <= now)
       {
 	FIB_ITERATE_PUT(&fit, node);
 	fib_delete(&p->routes, node);
-	changed = 1;
 	goto again;
       }
       else
-	next = MIN(next, rt->expires);
+	next = MIN(next, expires);
     }
   }
   FIB_ITERATE_END(node);
 
-  if (changed)
-  {
-    struct radv_iface *ifa;
-    WALK_LIST(ifa, p->iface_list)
-      radv_invalidate(ifa);
-  }
-
   p->prune_time = next;
 }
 

proto/radv/radv.h

@@ -35,7 +35,6 @@
 #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
@@ -55,9 +54,7 @@ struct radv_config
   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 */
+  u32 max_linger_time;		/* Maximum of interface route_linger_time */
 };
 
 struct radv_iface_config
@@ -71,8 +68,8 @@ struct radv_iface_config
   u32 max_ra_int;
   u32 min_delay;
 
-  u32 linger_time;		/* How long a dead prefix should still be advertised with 0
-				   lifetime */
+  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 */
@@ -84,8 +81,11 @@ struct radv_iface_config
   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 default_preference;	 /* Default Router Preference (RFC 4191) */
+  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
@@ -132,10 +132,11 @@ struct radv_route
 {
   struct fib_node n;
   u32 lifetime;			/* Lifetime from an attribute */
-  u8 lifetime_set;		/* Is the lifetime set by an attribute? */
+  u8 lifetime_set;		/* Whether lifetime is defined */
   u8 preference;		/* Preference of the route, RA_PREF_* */
-  u8 alive;
-  bird_clock_t expires;		/* Time to remove when !alive */
+  u8 preference_set;		/* Whether preference is defined */
+  u8 valid;			/* Whethe route is valid or withdrawn */
+  bird_clock_t changed;		/* Last time when the route changed */
 };
 
 struct radv_proto
@@ -154,11 +155,10 @@ 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
+  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 */
-  bird_clock_t expires;		/* The time when we drop this prefix from
-				   advertising. It is valid only if !alive. */
+  bird_clock_t changed;		/* Last time when the prefix changed */
   struct radv_prefix_config *cf; /* The config tied to this prefix */
 };
 
@@ -172,6 +172,7 @@ struct radv_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 */
+  bird_clock_t valid_time;	/* Cached packet is valid until first linger timeout */
 
   timer *timer;
   struct object_lock *lock;