Added debugging of communication between protocols and routing tables.
Just ask for "debug routes" if you want to see the routes and "debug filters" if you want even the rejected ones.
This commit is contained in:
Martin Mares
parent
c8d5ffafb7
commit
cfd46ee4c5
2 changed files with 98 additions and 19 deletions
4
TODO
4
TODO
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@ -1,7 +1,6 @@
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Core
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~~~~
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- debug: interfaces
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- debug: route updates
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- debug: static
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- debug: pipe
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- debug: krt
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@ -9,9 +8,6 @@ Core
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- static: check validity of route destination?
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- static: allow specifying a per-route filter program for setting route attributes?
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- rte_update: check whether all bits not covered by masklen are zero
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- rte_update: debug mode
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- krt: rescan interfaces when route addition fails?
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- tagging of external routes?
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113
nest/rt-table.c
113
nest/rt-table.c
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@ -27,6 +27,8 @@ static linpool *rte_update_pool;
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static pool *rt_table_pool;
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static list routing_tables;
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static void rt_format_via(rte *e, byte *via);
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static void
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rte_init(struct fib_node *N)
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{
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@ -93,6 +95,29 @@ rte_better(rte *new, rte *old)
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return 0;
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}
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static void
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rte_trace(struct proto *p, rte *e, int dir, char *msg)
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{
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byte via[STD_ADDRESS_P_LENGTH+32];
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rt_format_via(e, via);
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log(L_TRACE "%s %c %s %I/%d %s", p->name, dir, msg, e->net->n.prefix, e->net->n.pxlen, via);
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}
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static inline void
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rte_trace_in(unsigned int flag, struct proto *p, rte *e, char *msg)
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{
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if (p->debug & flag)
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rte_trace(p, e, '<', msg);
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}
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static inline void
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rte_trace_out(unsigned int flag, struct proto *p, rte *e, char *msg)
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{
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if (p->debug & flag)
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rte_trace(p, e, '>', msg);
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}
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static inline void
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do_rte_announce(struct announce_hook *a, net *net, rte *new, rte *old, ea_list *tmpa, int class)
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{
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@ -103,13 +128,24 @@ do_rte_announce(struct announce_hook *a, net *net, rte *new, rte *old, ea_list *
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if (new)
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{
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int ok;
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if ((class & IADDR_SCOPE_MASK) < p->min_scope ||
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(ok = p->import_control ? p->import_control(p, &new, &tmpa, rte_update_pool) : 0) < 0 ||
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(!ok && (p->out_filter == FILTER_REJECT ||
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p->out_filter && f_run(p->out_filter, &new, &tmpa, rte_update_pool) > F_ACCEPT)
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)
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)
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new = NULL;
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if ((class & IADDR_SCOPE_MASK) < p->min_scope)
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{
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rte_trace_out(D_FILTERS, p, new, "out of scope");
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new = NULL;
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}
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else if ((ok = p->import_control ? p->import_control(p, &new, &tmpa, rte_update_pool) : 0) < 0)
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{
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rte_trace_out(D_FILTERS, p, new, "rejected by protocol");
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new = NULL;
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}
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else if (ok)
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rte_trace_out(D_FILTERS, p, new, "forced accept by protocol");
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else if (p->out_filter == FILTER_REJECT ||
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p->out_filter && f_run(p->out_filter, &new, &tmpa, rte_update_pool) > F_ACCEPT)
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{
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rte_trace_out(D_FILTERS, p, new, "filtered out");
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new = NULL;
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}
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}
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if (old && p->out_filter)
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{
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@ -123,6 +159,15 @@ do_rte_announce(struct announce_hook *a, net *net, rte *new, rte *old, ea_list *
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old = NULL;
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}
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}
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if (p->debug & D_ROUTES)
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{
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if (new && old)
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rte_trace_out(D_ROUTES, p, new, "replaced");
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else if (new)
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rte_trace_out(D_ROUTES, p, new, "added");
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else
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rte_trace_out(D_ROUTES, p, old, "removed");
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}
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if (new || old)
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p->rt_notify(p, net, new, old, tmpa);
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if (new && new != new0) /* Discard temporary rte's */
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@ -177,7 +222,12 @@ rte_validate(rte *e)
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int c;
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net *n = e->net;
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ASSERT(!ipa_nonzero(ipa_and(n->n.prefix, ipa_not(ipa_mkmask(n->n.pxlen)))));
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if (ipa_nonzero(ipa_and(n->n.prefix, ipa_not(ipa_mkmask(n->n.pxlen)))))
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{
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log(L_BUG "Ignoring bogus prefix %I/%d received via %s",
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n->n.prefix, n->n.pxlen, e->attrs->proto->name);
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return 0;
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}
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if (n->n.pxlen)
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{
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c = ipa_classify(n->n.prefix);
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@ -238,6 +288,7 @@ rte_recalculate(rtable *table, net *net, struct proto *p, rte *new, ea_list *tmp
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rte_announce(table, net, new, old_best, tmpa);
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new->next = net->routes;
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net->routes = new;
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rte_trace_in(D_ROUTES, p, new, "added [best]");
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}
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else
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{
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@ -272,6 +323,16 @@ rte_recalculate(rtable *table, net *net, struct proto *p, rte *new, ea_list *tmp
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{
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new->next = old_best->next;
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old_best->next = new;
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rte_trace_in(D_ROUTES, p, new, "added");
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}
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else if (old && (p->debug & D_ROUTES))
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{
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if (old != old_best)
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rte_trace_in(D_ROUTES, p, old, "removed");
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else if (net->routes)
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rte_trace_in(D_ROUTES, p, old, "removed [replaced]");
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else
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rte_trace_in(D_ROUTES, p, old, "removed [sole]");
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}
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}
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if (old)
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@ -311,8 +372,16 @@ rte_update(rtable *table, net *net, struct proto *p, rte *new)
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rte_update_lock();
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if (new)
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{
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if (!rte_validate(new) || p->in_filter == FILTER_REJECT)
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goto drop;
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if (!rte_validate(new))
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{
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rte_trace_in(D_FILTERS, p, new, "invalid");
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goto drop;
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}
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if (p->in_filter == FILTER_REJECT)
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{
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rte_trace_in(D_FILTERS, p, new, "filtered out");
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goto drop;
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}
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if (p->make_tmp_attrs)
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tmpa = p->make_tmp_attrs(new, rte_update_pool);
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if (p->in_filter)
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@ -320,7 +389,10 @@ rte_update(rtable *table, net *net, struct proto *p, rte *new)
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ea_list *old_tmpa = tmpa;
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int fr = f_run(p->in_filter, &new, &tmpa, rte_update_pool);
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if (fr > F_ACCEPT)
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goto drop;
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{
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rte_trace_in(D_FILTERS, p, new, "filtered out");
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goto drop;
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}
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if (tmpa != old_tmpa && p->store_tmp_attrs)
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p->store_tmp_attrs(new, tmpa);
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}
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@ -340,8 +412,11 @@ drop:
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void
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rte_discard(rtable *t, rte *old) /* Non-filtered route deletion, used during garbage collection */
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{
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net *n = old->net;
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struct proto *p = old->attrs->proto;
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rte_update_lock();
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rte_recalculate(t, old->net, old->attrs->proto, NULL, NULL);
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rte_recalculate(t, n, p, NULL, NULL);
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rte_update_unlock();
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}
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@ -567,10 +642,8 @@ rt_commit(struct config *new, struct config *old)
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*/
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static void
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rt_show_rte(struct cli *c, byte *ia, rte *e, struct rt_show_data *d)
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rt_format_via(rte *e, byte *via)
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{
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byte via[STD_ADDRESS_P_LENGTH+32], from[STD_ADDRESS_P_LENGTH];
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byte tm[TM_RELTIME_BUFFER_SIZE], info[256];
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rta *a = e->attrs;
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switch (a->dest)
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@ -582,6 +655,16 @@ rt_show_rte(struct cli *c, byte *ia, rte *e, struct rt_show_data *d)
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case RTD_PROHIBIT: bsprintf(via, "prohibited"); break;
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default: bsprintf(via, "???");
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}
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}
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static void
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rt_show_rte(struct cli *c, byte *ia, rte *e, struct rt_show_data *d)
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{
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byte via[STD_ADDRESS_P_LENGTH+32], from[STD_ADDRESS_P_LENGTH];
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byte tm[TM_RELTIME_BUFFER_SIZE], info[256];
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rta *a = e->attrs;
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rt_format_via(e, via);
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tm_format_reltime(tm, e->lastmod);
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if (ipa_nonzero(a->from) && !ipa_equal(a->from, a->gw))
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bsprintf(from, " from %I", a->from);
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