{
struct fib6_info *leaf = rcu_dereference_protected(fn->leaf,
lockdep_is_held(&rt->fib6_table->tb6_lock));
- enum fib_event_type event = FIB_EVENT_ENTRY_ADD;
- struct fib6_info *iter = NULL, *match = NULL;
+ struct fib6_info *iter = NULL;
struct fib6_info __rcu **ins;
+ struct fib6_info __rcu **fallback_ins = NULL;
int replace = (info->nlh &&
(info->nlh->nlmsg_flags & NLM_F_REPLACE));
- int append = (info->nlh &&
- (info->nlh->nlmsg_flags & NLM_F_APPEND));
int add = (!info->nlh ||
(info->nlh->nlmsg_flags & NLM_F_CREATE));
int found = 0;
+ bool rt_can_ecmp = rt6_qualify_for_ecmp(rt);
u16 nlflags = NLM_F_EXCL;
int err;
- if (append)
+ if (info->nlh && (info->nlh->nlmsg_flags & NLM_F_APPEND))
nlflags |= NLM_F_APPEND;
ins = &fn->leaf;
nlflags &= ~NLM_F_EXCL;
if (replace) {
- found++;
- break;
+ if (rt_can_ecmp == rt6_qualify_for_ecmp(iter)) {
+ found++;
+ break;
+ }
+ if (rt_can_ecmp)
+ fallback_ins = fallback_ins ?: ins;
+ goto next_iter;
}
if (rt6_duplicate_nexthop(iter, rt)) {
fib6_metric_set(iter, RTAX_MTU, rt->fib6_pmtu);
return -EEXIST;
}
-
- /* first route that matches */
- if (!match)
- match = iter;
+ /* If we have the same destination and the same metric,
+ * but not the same gateway, then the route we try to
+ * add is sibling to this route, increment our counter
+ * of siblings, and later we will add our route to the
+ * list.
+ * Only static routes (which don't have flag
+ * RTF_EXPIRES) are used for ECMPv6.
+ *
+ * To avoid long list, we only had siblings if the
+ * route have a gateway.
+ */
+ if (rt_can_ecmp &&
+ rt6_qualify_for_ecmp(iter))
+ rt->fib6_nsiblings++;
}
if (iter->fib6_metric > rt->fib6_metric)
break;
+next_iter:
ins = &iter->fib6_next;
}
+ if (fallback_ins && !found) {
+ /* No ECMP-able route found, replace first non-ECMP one */
+ ins = fallback_ins;
+ iter = rcu_dereference_protected(*ins,
+ lockdep_is_held(&rt->fib6_table->tb6_lock));
+ found++;
+ }
+
/* Reset round-robin state, if necessary */
if (ins == &fn->leaf)
fn->rr_ptr = NULL;
/* Link this route to others same route. */
- if (append && match) {
+ if (rt->fib6_nsiblings) {
+ unsigned int fib6_nsiblings;
struct fib6_info *sibling, *temp_sibling;
- if (rt->fib6_flags & RTF_REJECT) {
- NL_SET_ERR_MSG(extack,
- "Can not append a REJECT route");
- return -EINVAL;
- } else if (match->fib6_flags & RTF_REJECT) {
- NL_SET_ERR_MSG(extack,
- "Can not append to a REJECT route");
- return -EINVAL;
+ /* Find the first route that have the same metric */
+ sibling = leaf;
+ while (sibling) {
+ if (sibling->fib6_metric == rt->fib6_metric &&
+ rt6_qualify_for_ecmp(sibling)) {
+ list_add_tail(&rt->fib6_siblings,
+ &sibling->fib6_siblings);
+ break;
+ }
+ sibling = rcu_dereference_protected(sibling->fib6_next,
+ lockdep_is_held(&rt->fib6_table->tb6_lock));
}
- event = FIB_EVENT_ENTRY_APPEND;
- rt->fib6_nsiblings = match->fib6_nsiblings;
- list_add_tail(&rt->fib6_siblings, &match->fib6_siblings);
- match->fib6_nsiblings++;
-
/* For each sibling in the list, increment the counter of
* siblings. BUG() if counters does not match, list of siblings
* is broken!
*/
+ fib6_nsiblings = 0;
list_for_each_entry_safe(sibling, temp_sibling,
- &match->fib6_siblings, fib6_siblings) {
+ &rt->fib6_siblings, fib6_siblings) {
sibling->fib6_nsiblings++;
- BUG_ON(sibling->fib6_nsiblings != match->fib6_nsiblings);
+ BUG_ON(sibling->fib6_nsiblings != rt->fib6_nsiblings);
+ fib6_nsiblings++;
}
-
- rt6_multipath_rebalance(match);
+ BUG_ON(fib6_nsiblings != rt->fib6_nsiblings);
+ rt6_multipath_rebalance(temp_sibling);
}
/*
add:
nlflags |= NLM_F_CREATE;
- err = call_fib6_entry_notifiers(info->nl_net, event, rt,
- extack);
+ err = call_fib6_entry_notifiers(info->nl_net,
+ FIB_EVENT_ENTRY_ADD,
+ rt, extack);
if (err)
return err;
}
} else {
- struct fib6_info *tmp;
+ int nsiblings;
if (!found) {
if (add)
if (err)
return err;
- /* if route being replaced has siblings, set tmp to
- * last one, otherwise tmp is current route. this is
- * used to set fib6_next for new route
- */
- if (iter->fib6_nsiblings)
- tmp = list_last_entry(&iter->fib6_siblings,
- struct fib6_info,
- fib6_siblings);
- else
- tmp = iter;
-
- /* insert new route */
atomic_inc(&rt->fib6_ref);
rcu_assign_pointer(rt->fib6_node, fn);
- rt->fib6_next = tmp->fib6_next;
+ rt->fib6_next = iter->fib6_next;
rcu_assign_pointer(*ins, rt);
-
if (!info->skip_notify)
inet6_rt_notify(RTM_NEWROUTE, rt, info, NLM_F_REPLACE);
if (!(fn->fn_flags & RTN_RTINFO)) {
info->nl_net->ipv6.rt6_stats->fib_route_nodes++;
fn->fn_flags |= RTN_RTINFO;
}
+ nsiblings = iter->fib6_nsiblings;
+ iter->fib6_node = NULL;
+ fib6_purge_rt(iter, fn, info->nl_net);
+ if (rcu_access_pointer(fn->rr_ptr) == iter)
+ fn->rr_ptr = NULL;
+ fib6_info_release(iter);
- /* delete old route */
- rt = iter;
-
- if (rt->fib6_nsiblings) {
- struct fib6_info *tmp;
-
+ if (nsiblings) {
/* Replacing an ECMP route, remove all siblings */
- list_for_each_entry_safe(iter, tmp, &rt->fib6_siblings,
- fib6_siblings) {
- iter->fib6_node = NULL;
- fib6_purge_rt(iter, fn, info->nl_net);
- if (rcu_access_pointer(fn->rr_ptr) == iter)
- fn->rr_ptr = NULL;
- fib6_info_release(iter);
-
- rt->fib6_nsiblings--;
- info->nl_net->ipv6.rt6_stats->fib_rt_entries--;
+ ins = &rt->fib6_next;
+ iter = rcu_dereference_protected(*ins,
+ lockdep_is_held(&rt->fib6_table->tb6_lock));
+ while (iter) {
+ if (iter->fib6_metric > rt->fib6_metric)
+ break;
+ if (rt6_qualify_for_ecmp(iter)) {
+ *ins = iter->fib6_next;
+ iter->fib6_node = NULL;
+ fib6_purge_rt(iter, fn, info->nl_net);
+ if (rcu_access_pointer(fn->rr_ptr) == iter)
+ fn->rr_ptr = NULL;
+ fib6_info_release(iter);
+ nsiblings--;
+ info->nl_net->ipv6.rt6_stats->fib_rt_entries--;
+ } else {
+ ins = &iter->fib6_next;
+ }
+ iter = rcu_dereference_protected(*ins,
+ lockdep_is_held(&rt->fib6_table->tb6_lock));
}
+ WARN_ON(nsiblings != 0);
}
-
- WARN_ON(rt->fib6_nsiblings != 0);
-
- rt->fib6_node = NULL;
- fib6_purge_rt(rt, fn, info->nl_net);
- if (rcu_access_pointer(fn->rr_ptr) == rt)
- fn->rr_ptr = NULL;
- fib6_info_release(rt);
}
return 0;
git.samba.org / sfrench / cifs-2.6.git / blobdiff