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-rw-r--r--src/vnet/arp/arp_packet.h91
1 files changed, 91 insertions, 0 deletions
diff --git a/src/vnet/arp/arp_packet.h b/src/vnet/arp/arp_packet.h
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+++ b/src/vnet/arp/arp_packet.h
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+/*
+ * ethernet/arp.c: IP v4 ARP node
+ *
+ * Copyright (c) 2010 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef __ARP_PACKET_H__
+#define __ARP_PACKET_H__
+
+#include <vnet/arp/arp.h>
+
+/* Either we drop the packet or we send a reply to the sender. */
+typedef enum
+{
+ ARP_REPLY_NEXT_DROP,
+ ARP_REPLY_NEXT_REPLY_TX,
+ ARP_REPLY_N_NEXT,
+} arp_reply_next_t;
+
+static_always_inline u32
+arp_mk_reply (vnet_main_t * vnm,
+ vlib_buffer_t * p0,
+ u32 sw_if_index0,
+ const ip4_address_t * if_addr0,
+ ethernet_arp_header_t * arp0, ethernet_header_t * eth_rx)
+{
+ vnet_hw_interface_t *hw_if0;
+ u8 *rewrite0, rewrite0_len;
+ ethernet_header_t *eth_tx;
+ u32 next0;
+
+ /* Send a reply.
+ An adjacency to the sender is not always present,
+ so we use the interface to build us a rewrite string
+ which will contain all the necessary tags. */
+ rewrite0 = ethernet_build_rewrite (vnm, sw_if_index0,
+ VNET_LINK_ARP, eth_rx->src_address);
+ rewrite0_len = vec_len (rewrite0);
+
+ /* Figure out how much to rewind current data from adjacency. */
+ vlib_buffer_advance (p0, -rewrite0_len);
+ eth_tx = vlib_buffer_get_current (p0);
+
+ vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index0;
+ hw_if0 = vnet_get_sup_hw_interface (vnm, sw_if_index0);
+
+ /* Send reply back through input interface */
+ vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index0;
+ next0 = ARP_REPLY_NEXT_REPLY_TX;
+
+ arp0->opcode = clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_reply);
+
+ arp0->ip4_over_ethernet[1] = arp0->ip4_over_ethernet[0];
+
+ mac_address_from_bytes (&arp0->ip4_over_ethernet[0].mac,
+ hw_if0->hw_address);
+ clib_mem_unaligned (&arp0->ip4_over_ethernet[0].ip4.data_u32, u32) =
+ if_addr0->data_u32;
+
+ /* Hardware must be ethernet-like. */
+ ASSERT (vec_len (hw_if0->hw_address) == 6);
+
+ /* the rx nd tx ethernet headers wil overlap in the case
+ * when we received a tagged VLAN=0 packet, but we are sending
+ * back untagged */
+ clib_memcpy_fast (eth_tx, rewrite0, vec_len (rewrite0));
+ vec_free (rewrite0);
+
+ return (next0);
+}
+
+#endif
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */