diff options
| author |   Matthew Smith <mgsmith@netgate.com> | 2017-05-16 21:35:56 -0500 |
|---|---|---|
| committer |   Damjan Marion <dmarion.lists@gmail.com> | 2017-05-17 13:43:17 +0000 |
| commit | cb9ab47fd388c237fe0bad53d07e99096d338ac8 (patch) | |
| tree | ae6af784f244d5de51ea62eb85e4077aaf631dc0 /src | |
| parent | 025d4151e2d7627aa771d577d405464a276039ad (diff) | |
VPP-719: Accept ARP replies from VRRP hw addr
Check whether an ARP src hw addr starts with 00:00:5e:00:01
before rejecting due to a mismatch between ARP src hw addr
and ethernet frame src addr.
Change-Id: Ia3ecd5d6dba34876aca8d90bc622a0a1397e48fb
Signed-off-by: Matthew Smith <mgsmith@netgate.com>
Diffstat (limited to 'src')
| -rw-r--r-- | src/vnet/ethernet/arp.c | 34 |
1 files changed, 27 insertions, 7 deletions
diff --git a/src/vnet/ethernet/arp.c b/src/vnet/ethernet/arp.c index bfcd3573885..f44cb594dea 100644 --- a/src/vnet/ethernet/arp.c +++ b/src/vnet/ethernet/arp.c @@ -107,6 +107,8 @@ typedef struct #define ETHERNET_ARP_ARGS_POPULATE (1<<2) } vnet_arp_set_ip4_over_ethernet_rpc_args_t; +static const u8 vrrp_prefix[] = { 0x00, 0x00, 0x5E, 0x00, 0x01 }; + static void set_ip4_over_ethernet_rpc_callback (vnet_arp_set_ip4_over_ethernet_rpc_args_t * a); @@ -991,7 +993,7 @@ arp_input (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) ethernet_header_t *eth0; ip4_address_t *if_addr0, proxy_src; u32 pi0, error0, next0, sw_if_index0, conn_sw_if_index0, fib_index0; - u8 is_request0, dst_is_local0, is_unnum0; + u8 is_request0, dst_is_local0, is_unnum0, is_vrrp_reply0; ethernet_proxy_arp_t *pa; fib_node_index_t dst_fei, src_fei; fib_prefix_t pfx0; @@ -1097,10 +1099,19 @@ arp_input (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) /* Fill in ethernet header. */ eth0 = ethernet_buffer_get_header (p0); + is_vrrp_reply0 = + ((arp0->opcode == + clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_reply)) + && + (!memcmp + (arp0->ip4_over_ethernet[0].ethernet, vrrp_prefix, + sizeof (vrrp_prefix)))); + /* Trash ARP packets whose ARP-level source addresses do not - match their L2-frame-level source addresses */ + match their L2-frame-level source addresses, unless it's + a reply from a VRRP virtual router */ if (memcmp (eth0->src_address, arp0->ip4_over_ethernet[0].ethernet, - sizeof (eth0->src_address))) + sizeof (eth0->src_address)) && !is_vrrp_reply0) { error0 = ETHERNET_ARP_ERROR_l2_address_mismatch; goto drop2; @@ -2170,6 +2181,7 @@ arp_term_l2bd (vlib_main_t * vm, u16 bd_index0; u32 ip0; u8 *macp0; + u8 is_vrrp_reply0; pi0 = from[0]; to_next[0] = pi0; @@ -2218,12 +2230,20 @@ arp_term_l2bd (vlib_main_t * vm, if (error0) goto drop; + is_vrrp_reply0 = + ((arp0->opcode == + clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_reply)) + && + (!memcmp + (arp0->ip4_over_ethernet[0].ethernet, vrrp_prefix, + sizeof (vrrp_prefix)))); + /* Trash ARP packets whose ARP-level source addresses do not - match their L2-frame-level source addresses */ + match their L2-frame-level source addresses, unless it's + a reply from a VRRP virtual router */ if (PREDICT_FALSE - (memcmp - (eth0->src_address, arp0->ip4_over_ethernet[0].ethernet, - sizeof (eth0->src_address)))) + (memcmp (eth0->src_address, arp0->ip4_over_ethernet[0].ethernet, + sizeof (eth0->src_address)) && !is_vrrp_reply0)) { error0 = ETHERNET_ARP_ERROR_l2_address_mismatch; goto drop; |