7dc351f689
Mark arp packet as locally originated when probing/replying and don't apply any arp-term logic against it. Type: fix Signed-off-by: Stanislav Zaikin <zstaseg@gmail.com> Change-Id: I305ff5cac8cac456decf92f21b961aa4ce286079
94 lines
2.7 KiB
C
94 lines
2.7 KiB
C
/*
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* ethernet/arp.c: IP v4 ARP node
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*
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* Copyright (c) 2010 Cisco and/or its affiliates.
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef __ARP_PACKET_H__
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#define __ARP_PACKET_H__
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#include <vnet/arp/arp.h>
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/* Either we drop the packet or we send a reply to the sender. */
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typedef enum
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{
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ARP_REPLY_NEXT_DROP,
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ARP_REPLY_NEXT_REPLY_TX,
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ARP_REPLY_N_NEXT,
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} arp_reply_next_t;
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static_always_inline u32
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arp_mk_reply (vnet_main_t * vnm,
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vlib_buffer_t * p0,
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u32 sw_if_index0,
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const ip4_address_t * if_addr0,
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ethernet_arp_header_t * arp0, ethernet_header_t * eth_rx)
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{
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vnet_hw_interface_t *hw_if0;
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u8 *rewrite0, rewrite0_len;
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ethernet_header_t *eth_tx;
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u32 next0;
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/* Send a reply.
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An adjacency to the sender is not always present,
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so we use the interface to build us a rewrite string
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which will contain all the necessary tags. */
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rewrite0 = ethernet_build_rewrite (vnm, sw_if_index0,
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VNET_LINK_ARP, eth_rx->src_address);
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rewrite0_len = vec_len (rewrite0);
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/* Figure out how much to rewind current data from adjacency. */
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vlib_buffer_advance (p0, -rewrite0_len);
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eth_tx = vlib_buffer_get_current (p0);
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vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index0;
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hw_if0 = vnet_get_sup_hw_interface (vnm, sw_if_index0);
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/* Send reply back through input interface */
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vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index0;
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next0 = ARP_REPLY_NEXT_REPLY_TX;
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arp0->opcode = clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_reply);
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arp0->ip4_over_ethernet[1] = arp0->ip4_over_ethernet[0];
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mac_address_from_bytes (&arp0->ip4_over_ethernet[0].mac,
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hw_if0->hw_address);
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clib_mem_unaligned (&arp0->ip4_over_ethernet[0].ip4.data_u32, u32) =
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if_addr0->data_u32;
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p0->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
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/* Hardware must be ethernet-like. */
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ASSERT (vec_len (hw_if0->hw_address) == 6);
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/* the rx nd tx ethernet headers wil overlap in the case
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* when we received a tagged VLAN=0 packet, but we are sending
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* back untagged */
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clib_memcpy_fast (eth_tx, rewrite0, vec_len (rewrite0));
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vec_free (rewrite0);
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return (next0);
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}
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#endif
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/*
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* fd.io coding-style-patch-verification: ON
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*
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* Local Variables:
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* eval: (c-set-style "gnu")
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* End:
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*/
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