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Nexthop: Support for label stack in nest

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This commit is contained in:
Jan Moskyto Matejka 2016-06-10 14:34:41 +02:00
parent 5b208e296f
commit ec5e5d23fa
6 changed files with 83 additions and 29 deletions
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9
nest/route.h
View File

@ -338,6 +338,8 @@ struct nexthop {
struct iface *iface; /* Outgoing interface */
struct nexthop *next;
byte weight;
byte labels; /* Number of labels appended */
u32 label[0];
};
struct rte_src {
@ -510,16 +512,21 @@ uint ea_hash(ea_list *e); /* Calculate 16-bit hash value */
ea_list *ea_append(ea_list *to, ea_list *what);
void ea_format_bitfield(struct eattr *a, byte *buf, int bufsize, const char **names, int min, int max);
#define NEXTHOP_MAX_LABEL_STACK 8
static inline size_t nexthop_size(const struct nexthop *nh)
{ return sizeof(struct nexthop) + sizeof(u32)*nh->labels; }
int nexthop__same(struct nexthop *x, struct nexthop *y); /* Compare multipath nexthops */
static inline int nexthop_same(struct nexthop *x, struct nexthop *y)
{ return (x == y) || nexthop__same(x, y); }
struct nexthop *nexthop_merge(struct nexthop *x, struct nexthop *y, int rx, int ry, int max, linpool *lp);
static inline void nexthop_link(struct rta *a, struct nexthop *from)
{ a->nh.gw = from->gw; a->nh.iface = from->iface; a->nh.weight = from->weight; a->nh.next = from->next; }
{ memcpy(&a->nh, from, nexthop_size(from)); }
void nexthop_insert(struct nexthop *n, struct nexthop *y);
int nexthop_is_sorted(struct nexthop *x);
void rta_init(void);
static inline size_t rta_size(const rta *a) { return sizeof(rta) + sizeof(u32)*a->nh.labels; }
rta *rta_lookup(rta *); /* Get rta equivalent to this one, uc++ */
static inline int rta_is_cached(rta *r) { return r->aflags & RTAF_CACHED; }
static inline rta *rta_clone(rta *r) { r->uc++; return r; }

82
nest/rt-attr.c
View File

@ -60,8 +60,8 @@
pool *rta_pool;
static slab *rta_slab;
static slab *nexthop_slab;
static slab *rta_slab_[4];
static slab *nexthop_slab_[4];
static slab *rte_src_slab;
static struct idm src_ids;
@ -148,7 +148,11 @@ nexthop_hash(struct nexthop *x)
{
u32 h = 0;
for (; x; x = x->next)
h ^= ipa_hash(x->gw);
{
h ^= ipa_hash(x->gw) ^ (h << 5) ^ (h >> 9);
for (int i=0; i<x->labels; i++)
h ^= x->label[i] ^ (h << 6) ^ (h >> 7);
}
return h;
}
@ -157,10 +161,15 @@ int
nexthop__same(struct nexthop *x, struct nexthop *y)
{
for (; x && y; x = x->next, y = y->next)
if (!ipa_equal(x->gw, y->gw) || (x->iface != y->iface) || (x->weight != y->weight))
{
if (!ipa_equal(x->gw, y->gw) || (x->iface != y->iface) || (x->weight != y->weight) || (x->labels != y->labels))
return 0;
for (int i=0; i<x->labels; i++)
if (x->label[i] != y->label[i])
return 0;
}
return x == y;
return 1;
}
static int
@ -182,17 +191,28 @@ nexthop_compare_node(struct nexthop *x, struct nexthop *y)
if (r)
return r;
r = ((int) y->labels) - ((int) x->labels);
if (r)
return r;
for (int i=0; i<y->labels; i++)
{
r = ((int) y->label[i]) - ((int) x->label[i]);
if (r)
return r;
}
return ((int) x->iface->index) - ((int) y->iface->index);
}
static inline struct nexthop *
nexthop_copy_node(const struct nexthop *src, linpool *lp)
{
struct nexthop *n = lp_alloc(lp, sizeof(struct nexthop));
n->gw = src->gw;
n->iface = src->iface;
struct nexthop *n = lp_alloc(lp, nexthop_size(src));
memcpy(n, src, nexthop_size(src));
n->next = NULL;
n->weight = src->weight;
return n;
}
@ -291,6 +311,12 @@ nexthop_is_sorted(struct nexthop *x)
return 1;
}
static inline slab *
nexthop_slab(struct nexthop *nh)
{
return nexthop_slab_[nh->labels > 2 ? 3 : nh->labels];
}
static struct nexthop *
nexthop_copy(struct nexthop *o)
{
@ -299,7 +325,7 @@ nexthop_copy(struct nexthop *o)
for (; o; o = o->next)
{
struct nexthop *n = sl_alloc(nexthop_slab);
struct nexthop *n = sl_alloc(nexthop_slab(o));
n->gw = o->gw;
n->iface = o->iface;
n->next = NULL;
@ -320,7 +346,7 @@ nexthop_free(struct nexthop *o)
while (o)
{
n = o->next;
sl_free(nexthop_slab, o);
sl_free(nexthop_slab(o), o);
o = n;
}
}
@ -1024,20 +1050,24 @@ rta_same(rta *x, rta *y)
x->scope == y->scope &&
x->dest == y->dest &&
x->igp_metric == y->igp_metric &&
ipa_equal(x->nh.gw, y->nh.gw) &&
ipa_equal(x->from, y->from) &&
x->nh.iface == y->nh.iface &&
x->hostentry == y->hostentry &&
nexthop_same(&(x->nh), &(y->nh)) &&
ea_same(x->eattrs, y->eattrs));
}
static inline slab *
rta_slab(rta *a)
{
return rta_slab_[a->nh.labels > 2 ? 3 : a->nh.labels];
}
static rta *
rta_copy(rta *o)
{
rta *r = sl_alloc(rta_slab);
rta *r = sl_alloc(rta_slab(o));
memcpy(r, o, sizeof(rta));
memcpy(r, o, rta_size(o));
r->uc = 1;
r->nh.next = nexthop_copy(o->nh.next);
r->eattrs = ea_list_copy(o->eattrs);
@ -1138,14 +1168,14 @@ rta__free(rta *a)
if (a->nh.next)
nexthop_free(a->nh.next);
ea_free(a->eattrs);
sl_free(rta_slab, a);
sl_free(rta_slab(a), a);
}
rta *
rta_do_cow(rta *o, linpool *lp)
{
rta *r = lp_alloc(lp, sizeof(rta));
memcpy(r, o, sizeof(rta));
rta *r = lp_alloc(lp, rta_size(o));
memcpy(r, o, rta_size(o));
r->aflags = 0;
r->uc = 0;
return r;
@ -1176,6 +1206,9 @@ rta_dump(rta *a)
for (struct nexthop *nh = &(a->nh); nh; nh = nh->next)
{
if (ipa_nonzero(nh->gw)) debug(" ->%I", nh->gw);
if (nh->labels) debug(" L %d", nh->label[0]);
for (int i=1; i<nh->labels; i++)
debug("/%d", nh->label[i]);
debug(" [%s]", nh->iface ? nh->iface->name : "???");
}
if (a->eattrs)
@ -1233,8 +1266,17 @@ void
rta_init(void)
{
rta_pool = rp_new(&root_pool, "Attributes");
rta_slab = sl_new(rta_pool, sizeof(rta));
nexthop_slab = sl_new(rta_pool, sizeof(struct nexthop));
rta_slab_[0] = sl_new(rta_pool, sizeof(rta));
rta_slab_[1] = sl_new(rta_pool, sizeof(rta) + sizeof(u32));
rta_slab_[2] = sl_new(rta_pool, sizeof(rta) + sizeof(u32)*2);
rta_slab_[3] = sl_new(rta_pool, sizeof(rta) + sizeof(u32)*NEXTHOP_MAX_LABEL_STACK);
nexthop_slab_[0] = sl_new(rta_pool, sizeof(struct nexthop));
nexthop_slab_[1] = sl_new(rta_pool, sizeof(struct nexthop) + sizeof(u32));
nexthop_slab_[2] = sl_new(rta_pool, sizeof(struct nexthop) + sizeof(u32)*2);
nexthop_slab_[3] = sl_new(rta_pool, sizeof(struct nexthop) + sizeof(u32)*NEXTHOP_MAX_LABEL_STACK);
rta_alloc_hash();
rte_src_init();
}

2
nest/rt-table.c
View File

@ -1782,7 +1782,7 @@ static inline rte *
rt_next_hop_update_rte(rtable *tab UNUSED, rte *old)
{
rta a;
memcpy(&a, old->attrs, sizeof(rta));
memcpy(&a, old->attrs, rta_size(old->attrs));
rta_apply_hostentry(&a, old->attrs->hostentry);
a.aflags = 0;

1
proto/ospf/rt.c
View File

@ -37,6 +37,7 @@ static inline struct nexthop *
new_nexthop(struct ospf_proto *p, ip_addr gw, struct iface *iface, byte weight)
{
struct nexthop *nh = lp_alloc(p->nhpool, sizeof(struct nexthop));
nh->labels = 0;
nh->gw = gw;
nh->iface = iface;
nh->next = NULL;

17
proto/pipe/pipe.c
View File

@ -43,6 +43,8 @@
#include "pipe.h"
#include <alloca.h>
static void
pipe_rt_notify(struct proto *P, struct channel *src_ch, net *n, rte *new, rte *old, ea_list *attrs)
{
@ -51,7 +53,7 @@ pipe_rt_notify(struct proto *P, struct channel *src_ch, net *n, rte *new, rte *o
struct rte_src *src;
rte *e;
rta a;
rta *a;
if (!new && !old)
return;
@ -65,12 +67,13 @@ pipe_rt_notify(struct proto *P, struct channel *src_ch, net *n, rte *new, rte *o
if (new)
{
memcpy(&a, new->attrs, sizeof(rta));
a = alloca(rta_size(new->attrs));
memcpy(a, new->attrs, rta_size(new->attrs));
a.aflags = 0;
a.eattrs = attrs;
a.hostentry = NULL;
e = rte_get_temp(&a);
a->aflags = 0;
a->eattrs = attrs;
a->hostentry = NULL;
e = rte_get_temp(a);
e->pflags = 0;
/* Copy protocol specific embedded attributes. */
@ -78,7 +81,7 @@ pipe_rt_notify(struct proto *P, struct channel *src_ch, net *n, rte *new, rte *o
e->pref = new->pref;
e->pflags = new->pflags;
src = a.src;
src = a->src;
}
else
{

1
proto/static/static.c
View File

@ -88,6 +88,7 @@ static_install(struct proto *p, struct static_route *r)
nh->gw = r2->via;
nh->iface = r2->neigh->iface;
nh->weight = r2->weight;
nh->labels = 0;
if (a.nh.next)
nexthop_insert(&(a.nh), nh);
r2->state |= STS_INSTALLED;