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42814145d7
This patch adds a new OVN action 'put_dhcp_opts' to support native
DHCP in OVN.
ovn-controller parses this action and adds a NXT_PACKET_IN2
OF flow with 'pause' flag set and the DHCP options stored in
'userdata' field.
When the valid DHCP packet is received by ovn-controller, it frames a
new DHCP reply packet with the DHCP options present in the
'userdata' field and resumes the packet and stores 1 in the 1-bit subfield.
If the packet is invalid, it resumes the packet without any modifying and
stores 0 in the 1-bit subfield.
Eg. reg0[0] = put_dhcp_opts(offerip = 10.0.0.4, router = 10.0.0.1,
netmask = 255.255.255.0, lease_time = 3600,....)
A new 'DHCP_Options' table is added in SB DB which stores
the supported DHCP options with DHCP code and type. ovn-northd is
expected to popule this table.
The next patch will add logical flows with this action.
Signed-off-by: Numan Siddique <nusiddiq@redhat.com>
Co-authored-by: Ben Pfaff <blp@ovn.org>
Signed-off-by: Ben Pfaff <blp@ovn.org>
62 lines
2.2 KiB
C
62 lines
2.2 KiB
C
/*
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* Copyright (c) 2008, 2011 Nicira, Inc.
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*
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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 DHCP_H
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#define DHCP_H 1
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#include <stdint.h>
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#include "packets.h"
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#include "util.h"
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/* Ports used by DHCP. */
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#define DHCP_SERVER_PORT 67 /* Port used by DHCP server. */
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#define DHCP_CLIENT_PORT 68 /* Port used by DHCP client. */
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#define DHCP_MAGIC_COOKIE 0x63825363
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#define DHCP_HEADER_LEN 236
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struct dhcp_header {
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uint8_t op; /* DHCP_BOOTREQUEST or DHCP_BOOTREPLY. */
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uint8_t htype; /* ARP_HRD_ETHERNET (typically). */
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uint8_t hlen; /* ETH_ADDR_LEN (typically). */
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uint8_t hops; /* Hop count; set to 0 by client. */
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ovs_be32 xid; /* Transaction ID. */
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ovs_be16 secs; /* Since client started address acquisition. */
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ovs_be16 flags; /* DHCP_FLAGS_*. */
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ovs_be32 ciaddr; /* Client IP, if it has a lease for one. */
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ovs_be32 yiaddr; /* Client ("your") IP address. */
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ovs_be32 siaddr; /* Next server IP address. */
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ovs_be32 giaddr; /* Relay agent IP address. */
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uint8_t chaddr[16]; /* Client hardware address. */
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char sname[64]; /* Optional server host name. */
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char file[128]; /* Boot file name. */
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/* Followed by variable-length options field. */
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};
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BUILD_ASSERT_DECL(DHCP_HEADER_LEN == sizeof(struct dhcp_header));
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#define DHCP_OP_REQUEST 1
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#define DHCP_OP_REPLY 2
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#define DHCP_MSG_DISCOVER 1
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#define DHCP_MSG_OFFER 2
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#define DHCP_MSG_REQUEST 3
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#define DHCP_MSG_ACK 5
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#define DHCP_OPT_MSG_TYPE 53
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#define DHCP_OPT_END 255
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#endif /* dhcp.h */
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