e->sw_if_index = sw_if_index;
e->ip4_address = a->ip4;
+ e->fib_entry_index = FIB_NODE_INDEX_INVALID;
clib_memcpy (e->ethernet_address,
a->ethernet, sizeof (e->ethernet_address));
static int
arp_unnumbered (vlib_buffer_t * p0,
- u32 pi0, ethernet_header_t * eth0, u32 sw_if_index)
+ u32 pi0,
+ ethernet_header_t * eth0,
+ u32 input_sw_if_index, u32 conn_sw_if_index)
{
vlib_main_t *vm = vlib_get_main ();
vnet_main_t *vnm = vnet_get_main ();
vnet_interface_main_t *vim = &vnm->interface_main;
vnet_sw_interface_t *si;
vnet_hw_interface_t *hi;
- u32 unnum_src_sw_if_index;
- u32 *broadcast_swifs = 0;
u32 *buffers = 0;
- u32 n_alloc = 0;
vlib_buffer_t *b0;
int i;
u8 dst_mac_address[6];
i16 header_size;
ethernet_arp_header_t *arp0;
- /* Save the dst mac address */
- clib_memcpy (dst_mac_address, eth0->dst_address, sizeof (dst_mac_address));
+ /* verify that the input interface is unnumbered to the connected.
+ * the connected interface is the interface on which the subnet is
+ * configured */
+ si = &vim->sw_interfaces[input_sw_if_index];
- /* Figure out which sw_if_index supplied the address */
- unnum_src_sw_if_index = sw_if_index;
-
- /* Track down all users of the unnumbered source */
- /* *INDENT-OFF* */
- pool_foreach (si, vim->sw_interfaces,
- ({
- if (si->flags & VNET_SW_INTERFACE_FLAG_UNNUMBERED &&
- (si->unnumbered_sw_if_index == unnum_src_sw_if_index))
- {
- vec_add1 (broadcast_swifs, si->sw_if_index);
- }
- }));
- /* *INDENT-ON* */
-
- /* If there are no interfaces un-unmbered to this interface,
- we are done here. */
- if (0 == vec_len (broadcast_swifs))
- return 0;
-
- /* Allocate buffering if we need it */
- if (vec_len (broadcast_swifs) > 1)
+ if (!(si->flags & VNET_SW_INTERFACE_FLAG_UNNUMBERED &&
+ (si->unnumbered_sw_if_index == conn_sw_if_index)))
{
- vec_validate (buffers, vec_len (broadcast_swifs) - 2);
- n_alloc = vlib_buffer_alloc (vm, buffers, vec_len (buffers));
- _vec_len (buffers) = n_alloc;
- for (i = 0; i < n_alloc; i++)
- {
- b0 = vlib_get_buffer (vm, buffers[i]);
-
- /* xerox (partially built) ARP pkt */
- clib_memcpy (b0->data, p0->data,
- p0->current_length + p0->current_data);
- b0->current_data = p0->current_data;
- b0->current_length = p0->current_length;
- vnet_buffer (b0)->sw_if_index[VLIB_RX] =
- vnet_buffer (p0)->sw_if_index[VLIB_RX];
- }
+ /* the input interface is not unnumbered to the interface on which
+ * the sub-net is configured that covers the ARP request.
+ * So this is not the case for unnumbered.. */
+ return 0;
}
+ /* Save the dst mac address */
+ clib_memcpy (dst_mac_address, eth0->dst_address, sizeof (dst_mac_address));
+
vec_insert (buffers, 1, 0);
buffers[0] = pi0;
b0 = vlib_get_buffer (vm, buffers[i]);
arp0 = vlib_buffer_get_current (b0);
- hi = vnet_get_sup_hw_interface (vnm, broadcast_swifs[i]);
- si = vnet_get_sw_interface (vnm, broadcast_swifs[i]);
+ hi = vnet_get_sup_hw_interface (vnm, input_sw_if_index);
+ si = vnet_get_sw_interface (vnm, input_sw_if_index);
/* For decoration, most likely */
vnet_buffer (b0)->sw_if_index[VLIB_TX] = hi->sw_if_index;
}
/* The regular path outputs the original pkt.. */
- vnet_buffer (p0)->sw_if_index[VLIB_TX] = broadcast_swifs[0];
+ vnet_buffer (p0)->sw_if_index[VLIB_TX] = input_sw_if_index;
- vec_free (broadcast_swifs);
vec_free (buffers);
return !0;
}
+static u32
+arp_learn (vnet_main_t * vnm,
+ ethernet_arp_main_t * am, u32 sw_if_index, void *addr)
+{
+ if (am->limit_arp_cache_size &&
+ pool_elts (am->ip4_entry_pool) >= am->limit_arp_cache_size)
+ unset_random_arp_entry ();
+
+ vnet_arp_set_ip4_over_ethernet (vnm, sw_if_index, addr, 0, 0);
+ return (ETHERNET_ARP_ERROR_l3_src_address_learned);
+}
+
static uword
arp_input (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
{
goto drop2;
}
- /* Learn or update sender's mapping only for requests or unicasts
- that don't match local interface address. */
- if (ethernet_address_cast (eth0->dst_address) ==
- ETHERNET_ADDRESS_UNICAST || is_request0)
- {
- if (am->limit_arp_cache_size &&
- pool_elts (am->ip4_entry_pool) >= am->limit_arp_cache_size)
- unset_random_arp_entry ();
-
- vnet_arp_set_ip4_over_ethernet (vnm, sw_if_index0,
- &arp0->ip4_over_ethernet[0],
- 0 /* is_static */ , 0);
- error0 = ETHERNET_ARP_ERROR_l3_src_address_learned;
- }
-
- /* Only send a reply for requests sent which match a local interface. */
- if (!(is_request0 && dst_is_local0))
+ /* Learn or update sender's mapping only for replies to addresses
+ * that are local to the subnet */
+ if (arp0->opcode ==
+ clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_reply) &&
+ dst_is_local0)
{
- error0 =
- (arp0->opcode ==
- clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_reply) ?
- ETHERNET_ARP_ERROR_replies_received : error0);
+ error0 = arp_learn (vnm, am, sw_if_index0,
+ &arp0->ip4_over_ethernet[0]);
goto drop1;
}
{
if (is_unnum0)
{
- if (!arp_unnumbered (p0, pi0, eth0, conn_sw_if_index0))
+ if (!arp_unnumbered (p0, pi0, eth0,
+ sw_if_index0, conn_sw_if_index0))
goto drop2;
}
else
}
}
+ /* We are going to reply to this request, so learn the sender */
+ error0 = arp_learn (vnm, am, sw_if_index0,
+ &arp0->ip4_over_ethernet[1]);
+
vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
n_left_to_next, pi0, next0);
{
ethernet_arp_main_t *am = ðernet_arp_main;
- /* it's safe to delete the ADJ source on the FIB entry, even if it
- * was added */
- fib_table_entry_delete_index (e->fib_entry_index, FIB_SOURCE_ADJ);
+ if (FIB_NODE_INDEX_INVALID != e->fib_entry_index)
+ fib_table_entry_delete_index (e->fib_entry_index, FIB_SOURCE_ADJ);
hash_unset (eai->arp_entries, e->ip4_address.as_u32);
pool_put (am->ip4_entry_pool, e);
}
Code Review / vpp.git / blobdiff