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BGP: Fix unknown attribute handling

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This commit is contained in:
Ondrej Zajicek (work) 2018-01-02 16:57:45 +01:00
parent e62cd03307
commit d493d0f180
3 changed files with 44 additions and 1 deletions
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40
nest/route.h
View File

@ -555,6 +555,46 @@ 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);
static inline eattr *
ea_set_attr(ea_list **to, struct linpool *pool, uint id, uint flags, uint type, uintptr_t val)
{
ea_list *a = lp_alloc(pool, sizeof(ea_list) + sizeof(eattr));
eattr *e = &a->attrs[0];
a->flags = EALF_SORTED;
a->count = 1;
a->next = *to;
*to = a;
e->id = id;
e->type = type;
e->flags = flags;
if (type & EAF_EMBEDDED)
e->u.data = (u32) val;
else
e->u.ptr = (struct adata *) val;
return e;
}
static inline void
ea_set_attr_u32(ea_list **to, struct linpool *pool, uint id, uint flags, uint type, u32 val)
{ ea_set_attr(to, pool, id, flags, type, (uintptr_t) val); }
static inline void
ea_set_attr_ptr(ea_list **to, struct linpool *pool, uint id, uint flags, uint type, struct adata *val)
{ ea_set_attr(to, pool, id, flags, type, (uintptr_t) val); }
static inline void
ea_set_attr_data(ea_list **to, struct linpool *pool, uint id, uint flags, uint type, void *data, uint len)
{
struct adata *a = lp_alloc_adata(pool, len);
memcpy(a->data, data, len);
ea_set_attr(to, pool, id, flags, type, (uintptr_t) a);
}
#define NEXTHOP_MAX_SIZE (sizeof(struct nexthop) + sizeof(u32)*MPLS_MAX_LABEL_STACK)
static inline size_t nexthop_size(const struct nexthop *nh)

3
proto/bgp/attrs.c
View File

@ -701,7 +701,8 @@ bgp_format_mpls_label_stack(eattr *a, byte *buf, uint size)
static inline void
bgp_decode_unknown(struct bgp_parse_state *s, uint code, uint flags, byte *data, uint len, ea_list **to)
{
bgp_set_attr_data(to, s->pool, code, flags, data, len);
/* Cannot use bgp_set_attr_data() as it works on known attributes only */
ea_set_attr_data(to, s->pool, EA_CODE(EAP_BGP, code), flags, EAF_TYPE_OPAQUE, data, len);
}

2
proto/bgp/packets.c
View File

@ -2284,6 +2284,8 @@ bgp_rx_update(struct bgp_conn *conn, byte *pkt, uint len)
if (s.attr_len)
ea = bgp_decode_attrs(&s, s.attrs, s.attr_len);
else
ea = NULL;
/* Check for End-of-RIB marker */
if (!s.attr_len && !s.ip_unreach_len && !s.ip_reach_len)