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BGP: Cluster list item should be prepended

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Commit 3c09af41... changed behavior of int_set_add() from prepend to
append, which makes more sense for community list, but prepend must be
used for cluster list. Add int_set_prepend() and use it in cluster list
handling code.
This commit is contained in:
Ondrej Zajicek (work) 2016-11-15 16:24:39 +01:00
parent c8cafc8ebb
commit 261816b0d4
3 changed files with 23 additions and 3 deletions
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23
nest/a-set.c
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@ -231,6 +231,26 @@ lc_set_contains(struct adata *list, lcomm val)
return 0;
}
struct adata *
int_set_prepend(struct linpool *pool, struct adata *list, u32 val)
{
struct adata *res;
int len;
if (int_set_contains(list, val))
return list;
len = list ? list->length : 0;
res = lp_alloc(pool, sizeof(struct adata) + len + 4);
res->length = len + 4;
if (list)
memcpy(res->data + 4, list->data, list->length);
* (u32 *) res->data = val;
return res;
}
struct adata *
int_set_add(struct linpool *pool, struct adata *list, u32 val)
@ -248,8 +268,7 @@ int_set_add(struct linpool *pool, struct adata *list, u32 val)
if (list)
memcpy(res->data, list->data, list->length);
u32 *c = (u32 *) (res->data + len);
*c = val;
* (u32 *) (res->data + len) = val;
return res;
}

1
nest/attrs.h
View file

@ -132,6 +132,7 @@ int lc_set_format(struct adata *set, int from, byte *buf, uint size);
int int_set_contains(struct adata *list, u32 val);
int ec_set_contains(struct adata *list, u64 val);
int lc_set_contains(struct adata *list, lcomm val);
struct adata *int_set_prepend(struct linpool *pool, struct adata *list, u32 val);
struct adata *int_set_add(struct linpool *pool, struct adata *list, u32 val);
struct adata *ec_set_add(struct linpool *pool, struct adata *list, u64 val);
struct adata *lc_set_add(struct linpool *pool, struct adata *list, lcomm val);

2
proto/bgp/attrs.c
View file

@ -1077,7 +1077,7 @@ static inline void
bgp_cluster_list_prepend(rte *e, ea_list **attrs, struct linpool *pool, u32 cid)
{
eattr *a = ea_find(e->attrs->eattrs, EA_CODE(EAP_BGP, BA_CLUSTER_LIST));
bgp_attach_attr(attrs, pool, BA_CLUSTER_LIST, (uintptr_t) int_set_add(pool, a ? a->u.ptr : NULL, cid));
bgp_attach_attr(attrs, pool, BA_CLUSTER_LIST, (uintptr_t) int_set_prepend(pool, a ? a->u.ptr : NULL, cid));
}
static int