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Nexthop: Fixed hostentry

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This commit is contained in:
Jan Moskyto Matejka 2017-02-24 14:05:11 +01:00
parent 93f50ca317
commit 039a65d0e4
5 changed files with 57 additions and 60 deletions
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6
nest/route.h
View file

@ -200,8 +200,8 @@ struct hostentry {
unsigned hash_key; /* Hash key */
unsigned uc; /* Use count */
struct rta *src; /* Source rta entry */
struct nexthop *nh; /* Chosen next hop */
byte dest; /* Chosen route destination type (RTD_...) */
byte nexthop_linkable; /* Nexthop list is completely non-device */
u32 igp_metric; /* Chosen route IGP metric */
};
@ -344,8 +344,8 @@ struct nexthop {
struct iface *iface; /* Outgoing interface */
struct nexthop *next;
byte weight;
byte labels_append; /* Number of labels before hostentry was applied */
byte labels; /* Number of labels prepended */
byte labels_orig; /* Number of labels before hostentry was applied */
byte labels; /* Number of all labels */
u32 label[0];
};

2
nest/rt-attr.c
View file

@ -1155,12 +1155,12 @@ rta__free(rta *a)
*a->pprev = a->next;
if (a->next)
a->next->pprev = a->pprev;
a->aflags = 0; /* Poison the entry */
rt_unlock_hostentry(a->hostentry);
rt_unlock_source(a->src);
if (a->nh.next)
nexthop_free(a->nh.next);
ea_free(a->eattrs);
a->aflags = 0; /* Poison the entry */
sl_free(rta_slab(a), a);
}

101
nest/rt-table.c
View file

@ -1764,7 +1764,7 @@ rta_next_hop_outdated(rta *a)
return a->dest != RTD_UNREACHABLE;
return (a->dest != he->dest) || (a->igp_metric != he->igp_metric) ||
!nexthop_same(&(a->nh), he->nh);
(!he->nexthop_linkable) || !nexthop_same(&(a->nh), &(he->src->nh));
}
static inline void
@ -1774,39 +1774,49 @@ rta_apply_hostentry(rta *a, struct hostentry *he)
a->dest = he->dest;
a->igp_metric = he->igp_metric;
if (a->nh.labels_append == 0)
if ((a->nh.labels_orig == 0) && (!a->nh.next) && he->nexthop_linkable)
{
a->nh = *(he->nh);
a->nh.labels_append = 0;
a->nh = he->src->nh;
return;
}
int labels_append = a->nh.labels_append;
u32 label_stack[MPLS_MAX_LABEL_STACK];
memcpy(label_stack, a->nh.label, labels_append * sizeof(u32));
struct nexthop *nhp = alloca(NEXTHOP_MAX_SIZE);
struct nexthop *nhp = NULL;
for (struct nexthop *nh = he->nh; nh; nh = nh->next)
for (struct nexthop *nhe = &(a->nh); nhe; nhe = nhe->next)
{
nhp = nhp ? (nhp->next = lp_alloc(rte_update_pool, NEXTHOP_MAX_SIZE)) : &(a->nh);
nhp->gw = ipa_nonzero(nh->gw) ? nh->gw : he->link;
nhp->iface = nh->iface; /* FIXME: This is at least strange, if not utter nonsense. */
nhp->weight = nh->weight;
nhp->labels = nh->labels + labels_append;
nhp->labels_append = labels_append;
if (nhp->labels <= MPLS_MAX_LABEL_STACK)
int labels_orig = nhe->labels_orig; /* Number of labels (at the bottom of stack) */
u32 label_stack[MPLS_MAX_LABEL_STACK];
memcpy(label_stack, nhe->label, labels_orig * sizeof(u32));
for (struct nexthop *nh = &(he->src->nh); nh; nh = nh->next)
{
memcpy(nhp->label, nh->label, nh->labels * sizeof(u32));
memcpy(&(nhp->label[nh->labels]), label_stack, labels_append * sizeof(u32));
}
else
{
log(L_WARN "Sum of label stack sizes %d + %d = %d exceedes allowed maximum (%d)",
nh->labels, labels_append, nhp->labels, MPLS_MAX_LABEL_STACK);
a->dest = RTD_UNREACHABLE;
break;
nhp->iface = nh->iface;
nhp->weight = nh->weight; /* FIXME: Ignoring the recursive nexthop's weight */
nhp->labels = nh->labels + labels_orig;
nhp->labels_orig = labels_orig;
if (nhp->labels <= MPLS_MAX_LABEL_STACK)
{
memcpy(nhp->label, nh->label, nh->labels * sizeof(u32)); /* First the hostentry labels */
memcpy(&(nhp->label[nh->labels]), label_stack, labels_orig * sizeof(u32)); /* Then the bottom labels */
}
else
{
log(L_WARN "Sum of label stack sizes %d + %d = %d exceedes allowed maximum (%d)",
nh->labels, labels_orig, nhp->labels, MPLS_MAX_LABEL_STACK);
continue;
}
if (ipa_nonzero(nh->gw))
nhp->gw = nh->gw; /* Router nexthop */
else if (ipa_nonzero(he->link))
nhp->gw = he->link; /* Device nexthop with link-local address known */
else
nhp->gw = he->addr; /* Device nexthop with link-local address unknown */
nhp = (nhp->next = lp_alloc(rte_update_pool, NEXTHOP_MAX_SIZE));
}
}
memcpy(&(a->nh), nhp, nexthop_size(nhp));
}
static inline rte *
@ -2231,12 +2241,12 @@ hc_new_hostentry(struct hostcache *hc, ip_addr a, ip_addr ll, rtable *dep, unsig
{
struct hostentry *he = sl_alloc(hc->slab);
he->addr = a;
he->link = ll;
he->tab = dep;
he->hash_key = k;
he->uc = 0;
he->src = NULL;
*he = (struct hostentry) {
.addr = a,
.link = ll,
.tab = dep,
.hash_key = k,
};
add_tail(&hc->hostentries, &he->ln);
hc_insert(hc, he);
@ -2357,6 +2367,7 @@ rt_update_hostentry(rtable *tab, struct hostentry *he)
/* Reset the hostentry */
he->src = NULL;
he->nexthop_linkable = 0;
he->dest = RTD_UNREACHABLE;
he->igp_metric = 0;
@ -2377,27 +2388,13 @@ rt_update_hostentry(rtable *tab, struct hostentry *he)
goto done;
}
if ((a->dest == RTD_UNICAST) && ipa_zero(a->nh.gw) && !a->next)
{
/* We have singlepath device route */
if (if_local_addr(he->addr, a->nh.iface))
{
/* The host address is a local address, this is not valid */
log(L_WARN "Next hop address %I is a local address of iface %s",
he->addr, a->nh.iface->name);
goto done;
}
/* The host is directly reachable, use link as a gateway */
he->nh = NULL;
he->dest = RTD_UNICAST;
}
else
{
/* The host is reachable through some route entry */
he->nh = &(a->nh);
he->dest = a->dest;
}
he->nexthop_linkable = 1;
for (struct nexthop *nh = &(a->nh); nh; nh = nh->next)
if (ipa_zero(nh->gw))
{
he->nexthop_linkable = 0;
break;
}
he->src = rta_clone(a);
he->igp_metric = rt_get_igp_metric(e);

2
proto/bgp/packets.c
View file

@ -1705,7 +1705,7 @@ bgp_decode_nlri(struct bgp_parse_state *s, u32 afi, byte *nlri, uint len, ea_lis
if (ea)
{
a = allocz(sizeof(struct rta));
a = allocz(RTA_MAX_SIZE);
a->source = RTS_BGP;
a->scope = SCOPE_UNIVERSE;

2
proto/static/static.c
View file

@ -120,7 +120,7 @@ drop:
if (r->dest == RTDX_RECURSIVE)
{
ap->nh.labels_append = ap->nh.labels = r->label_count;
ap->nh.labels_orig = ap->nh.labels = r->label_count;
memcpy(ap->nh.label, r->label_stack, r->label_count * sizeof(u32));
rta_set_recursive_next_hop(p->main_channel->table, ap, p_igp_table(p), r->via, IPA_NONE);
}