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-rw-r--r--src/vnet/ethernet/arp.c119
-rw-r--r--src/vnet/ip/ip6_neighbor.c8
-rw-r--r--src/vnet/ip/lookup.h23
-rw-r--r--test/test_neighbor.py38
4 files changed, 98 insertions, 90 deletions
diff --git a/src/vnet/ethernet/arp.c b/src/vnet/ethernet/arp.c
index 2367014e144..5ad0c3e3c2d 100644
--- a/src/vnet/ethernet/arp.c
+++ b/src/vnet/ethernet/arp.c
@@ -562,6 +562,7 @@ vnet_arp_set_ip4_over_ethernet_internal (vnet_main_t * vnm,
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));
@@ -839,66 +840,39 @@ unset_random_arp_entry (void)
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;
@@ -907,8 +881,8 @@ arp_unnumbered (vlib_buffer_t * p0,
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;
@@ -978,14 +952,25 @@ arp_unnumbered (vlib_buffer_t * p0,
}
/* 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)
{
@@ -1133,28 +1118,14 @@ 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;
}
@@ -1188,7 +1159,8 @@ arp_input (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
{
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
@@ -1242,6 +1214,10 @@ arp_input (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
}
}
+ /* 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);
@@ -1697,9 +1673,8 @@ arp_entry_free (ethernet_arp_interface_t * eai, ethernet_arp_ip4_entry_t * e)
{
ethernet_arp_main_t *am = &ethernet_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);
}
diff --git a/src/vnet/ip/ip6_neighbor.c b/src/vnet/ip/ip6_neighbor.c
index 92708f14d5b..edc670af3b0 100644
--- a/src/vnet/ip/ip6_neighbor.c
+++ b/src/vnet/ip/ip6_neighbor.c
@@ -273,7 +273,8 @@ ip6_neighbor_sw_interface_up_down (vnet_main_t * vnm,
{
n = pool_elt_at_index (nm->neighbor_pool, to_delete[i]);
mhash_unset (&nm->neighbor_index_by_key, &n->key, 0);
- fib_table_entry_delete_index (n->fib_entry_index, FIB_SOURCE_ADJ);
+ if (FIB_NODE_INDEX_INVALID != n->fib_entry_index)
+ fib_table_entry_delete_index (n->fib_entry_index, FIB_SOURCE_ADJ);
pool_put (nm->neighbor_pool, n);
}
@@ -609,6 +610,7 @@ vnet_set_ip6_ethernet_neighbor (vlib_main_t * vm,
mhash_set (&nm->neighbor_index_by_key, &k, n - nm->neighbor_pool,
/* old value */ 0);
n->key = k;
+ n->fib_entry_index = FIB_NODE_INDEX_INVALID;
clib_memcpy (n->link_layer_address,
link_layer_address, n_bytes_link_layer_address);
@@ -746,7 +748,9 @@ vnet_unset_ip6_ethernet_neighbor (vlib_main_t * vm,
adj_nbr_walk_nh6 (sw_if_index,
&n->key.ip6_address, ip6_nd_mk_incomplete_walk, NULL);
- fib_table_entry_delete_index (n->fib_entry_index, FIB_SOURCE_ADJ);
+
+ if (FIB_NODE_INDEX_INVALID != n->fib_entry_index)
+ fib_table_entry_delete_index (n->fib_entry_index, FIB_SOURCE_ADJ);
pool_put (nm->neighbor_pool, n);
out:
diff --git a/src/vnet/ip/lookup.h b/src/vnet/ip/lookup.h
index 48360b5b41f..0fc2a992a0f 100644
--- a/src/vnet/ip/lookup.h
+++ b/src/vnet/ip/lookup.h
@@ -416,7 +416,7 @@ ip_interface_address_get_address (ip_lookup_main_t * lm,
/* *INDENT-OFF* */
#define foreach_ip_interface_address(lm,a,sw_if_index,loop,body) \
do { \
- vnet_main_t *_vnm = vnet_get_main(); \
+ vnet_main_t *_vnm = vnet_get_main(); \
u32 _sw_if_index = sw_if_index; \
vnet_sw_interface_t *_swif; \
_swif = vnet_get_sw_interface (_vnm, _sw_if_index); \
@@ -424,13 +424,20 @@ do { \
/* \
* Loop => honor unnumbered interface addressing. \
*/ \
- if (loop && _swif->flags & VNET_SW_INTERFACE_FLAG_UNNUMBERED) \
- _sw_if_index = _swif->unnumbered_sw_if_index; \
- u32 _ia = \
- (vec_len((lm)->if_address_pool_index_by_sw_if_index) \
- > (_sw_if_index)) \
- ? vec_elt ((lm)->if_address_pool_index_by_sw_if_index, \
- (_sw_if_index)) : (u32)~0; \
+ if (_swif->flags & VNET_SW_INTERFACE_FLAG_UNNUMBERED) \
+ { \
+ if (loop) \
+ _sw_if_index = _swif->unnumbered_sw_if_index; \
+ else \
+ /* the interface is unnumbered, by the caller does not want \
+ * unnumbered interfaces considered/honoured */ \
+ break; \
+ } \
+ u32 _ia = ((vec_len((lm)->if_address_pool_index_by_sw_if_index) \
+ > (_sw_if_index)) ? \
+ vec_elt ((lm)->if_address_pool_index_by_sw_if_index, \
+ (_sw_if_index)) : \
+ (u32)~0); \
ip_interface_address_t * _a; \
while (_ia != ~0) \
{ \
diff --git a/test/test_neighbor.py b/test/test_neighbor.py
index f2b1cfa47ee..48c6a291248 100644
--- a/test/test_neighbor.py
+++ b/test/test_neighbor.py
@@ -112,8 +112,11 @@ class ARPTestCase(VppTestCase):
intf.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
+ timeout = 1
for i in self.pg_interfaces:
+ i.get_capture(0, timeout=timeout)
i.assert_nothing_captured(remark=remark)
+ timeout = 0.1
def test_arp(self):
""" ARP """
@@ -438,7 +441,9 @@ class ARPTestCase(VppTestCase):
# ERROR Cases
# 1 - don't respond to ARP request for address not within the
# interface's sub-net
- # 1a - nor within the unnumbered subnet
+ # 1b - nor within the unnumbered subnet
+ # 1c - nor within the subnet of a different interface
+ #
p = (Ether(dst="ff:ff:ff:ff:ff:ff", src=self.pg0.remote_mac) /
ARP(op="who-has",
hwsrc=self.pg0.remote_mac,
@@ -446,6 +451,10 @@ class ARPTestCase(VppTestCase):
psrc=self.pg0.remote_ip4))
self.send_and_assert_no_replies(self.pg0, p,
"ARP req for non-local destination")
+ self.assertFalse(find_nbr(self,
+ self.pg0.sw_if_index,
+ "10.10.10.3"))
+
p = (Ether(dst="ff:ff:ff:ff:ff:ff", src=self.pg2.remote_mac) /
ARP(op="who-has",
hwsrc=self.pg2.remote_mac,
@@ -455,6 +464,17 @@ class ARPTestCase(VppTestCase):
self.pg0, p,
"ARP req for non-local destination - unnum")
+ p = (Ether(dst="ff:ff:ff:ff:ff:ff", src=self.pg0.remote_mac) /
+ ARP(op="who-has",
+ hwsrc=self.pg0.remote_mac,
+ pdst=self.pg1.local_ip4,
+ psrc=self.pg1.remote_ip4))
+ self.send_and_assert_no_replies(self.pg0, p,
+ "ARP req diff sub-net")
+ self.assertFalse(find_nbr(self,
+ self.pg0.sw_if_index,
+ self.pg1.remote_ip4))
+
#
# 2 - don't respond to ARP request from an address not within the
# interface's sub-net
@@ -514,15 +534,11 @@ class ARPTestCase(VppTestCase):
def test_proxy_arp(self):
""" Proxy ARP """
+ self.pg1.generate_remote_hosts(2)
+
#
# Proxy ARP rewquest packets for each interface
#
- arp_req_pg2 = (Ether(src=self.pg2.remote_mac,
- dst="ff:ff:ff:ff:ff:ff") /
- ARP(op="who-has",
- hwsrc=self.pg2.remote_mac,
- pdst="10.10.10.3",
- psrc=self.pg1.remote_ip4))
arp_req_pg0 = (Ether(src=self.pg0.remote_mac,
dst="ff:ff:ff:ff:ff:ff") /
ARP(op="who-has",
@@ -535,6 +551,12 @@ class ARPTestCase(VppTestCase):
hwsrc=self.pg1.remote_mac,
pdst="10.10.10.3",
psrc=self.pg1.remote_ip4))
+ arp_req_pg2 = (Ether(src=self.pg2.remote_mac,
+ dst="ff:ff:ff:ff:ff:ff") /
+ ARP(op="who-has",
+ hwsrc=self.pg2.remote_mac,
+ pdst="10.10.10.3",
+ psrc=self.pg1.remote_hosts[1].ip4))
arp_req_pg3 = (Ether(src=self.pg3.remote_mac,
dst="ff:ff:ff:ff:ff:ff") /
ARP(op="who-has",
@@ -607,7 +629,7 @@ class ARPTestCase(VppTestCase):
self.pg2.local_mac,
self.pg2.remote_mac,
"10.10.10.3",
- self.pg1.remote_ip4)
+ self.pg1.remote_hosts[1].ip4)
#
# A request for an address out of the configured range