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dnsmasq 2.84

    1: /* dnsmasq is Copyright (c) 2000-2021 Simon Kelley
    2: 
    3:    This program is free software; you can redistribute it and/or modify
    4:    it under the terms of the GNU General Public License as published by
    5:    the Free Software Foundation; version 2 dated June, 1991, or
    6:    (at your option) version 3 dated 29 June, 2007.
    7:  
    8:    This program is distributed in the hope that it will be useful,
    9:    but WITHOUT ANY WARRANTY; without even the implied warranty of
   10:    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   11:    GNU General Public License for more details.
   12:      
   13:    You should have received a copy of the GNU General Public License
   14:    along with this program.  If not, see <http://www.gnu.org/licenses/>.
   15: */
   16: #define DHCP_SERVER_PORT 67
   17: #define DHCP_CLIENT_PORT 68
   18: #define DHCP_SERVER_ALTPORT 1067
   19: #define DHCP_CLIENT_ALTPORT 1068
   20: #define PXE_PORT 4011
   21: 
   22: /* These each hold a DHCP option max size 255
   23:    and get a terminating zero added */
   24: #define DHCP_BUFF_SZ 256
   25: 
   26: #define BOOTREQUEST              1
   27: #define BOOTREPLY                2
   28: #define DHCP_COOKIE              0x63825363
   29: 
   30: /* The Linux in-kernel DHCP client silently ignores any packet 
   31:    smaller than this. Sigh...........   */
   32: #define MIN_PACKETSZ             300
   33: 
   34: #define OPTION_PAD               0
   35: #define OPTION_NETMASK           1
   36: #define OPTION_ROUTER            3
   37: #define OPTION_DNSSERVER         6
   38: #define OPTION_HOSTNAME          12
   39: #define OPTION_DOMAINNAME        15
   40: #define OPTION_BROADCAST         28
   41: #define OPTION_VENDOR_CLASS_OPT  43
   42: #define OPTION_REQUESTED_IP      50 
   43: #define OPTION_LEASE_TIME        51
   44: #define OPTION_OVERLOAD          52
   45: #define OPTION_MESSAGE_TYPE      53
   46: #define OPTION_SERVER_IDENTIFIER 54
   47: #define OPTION_REQUESTED_OPTIONS 55
   48: #define OPTION_MESSAGE           56
   49: #define OPTION_MAXMESSAGE        57
   50: #define OPTION_T1                58
   51: #define OPTION_T2                59
   52: #define OPTION_VENDOR_ID         60
   53: #define OPTION_CLIENT_ID         61
   54: #define OPTION_SNAME             66
   55: #define OPTION_FILENAME          67
   56: #define OPTION_USER_CLASS        77
   57: #define OPTION_RAPID_COMMIT      80
   58: #define OPTION_CLIENT_FQDN       81
   59: #define OPTION_AGENT_ID          82
   60: #define OPTION_ARCH              93
   61: #define OPTION_PXE_UUID          97
   62: #define OPTION_SUBNET_SELECT     118
   63: #define OPTION_DOMAIN_SEARCH     119
   64: #define OPTION_SIP_SERVER        120
   65: #define OPTION_VENDOR_IDENT      124
   66: #define OPTION_VENDOR_IDENT_OPT  125
   67: #define OPTION_END               255
   68: 
   69: #define SUBOPT_CIRCUIT_ID        1
   70: #define SUBOPT_REMOTE_ID         2
   71: #define SUBOPT_SUBNET_SELECT     5     /* RFC 3527 */
   72: #define SUBOPT_SUBSCR_ID         6     /* RFC 3393 */
   73: #define SUBOPT_SERVER_OR         11    /* RFC 5107 */
   74: 
   75: #define SUBOPT_PXE_BOOT_ITEM     71    /* PXE standard */
   76: #define SUBOPT_PXE_DISCOVERY     6
   77: #define SUBOPT_PXE_SERVERS       8
   78: #define SUBOPT_PXE_MENU          9
   79: #define SUBOPT_PXE_MENU_PROMPT   10
   80: 
   81: #define DHCPDISCOVER             1
   82: #define DHCPOFFER                2
   83: #define DHCPREQUEST              3
   84: #define DHCPDECLINE              4
   85: #define DHCPACK                  5
   86: #define DHCPNAK                  6
   87: #define DHCPRELEASE              7
   88: #define DHCPINFORM               8
   89: 
   90: #define BRDBAND_FORUM_IANA       3561 /* Broadband forum IANA enterprise */
   91: 
   92: #define DHCP_CHADDR_MAX 16
   93: 
   94: struct dhcp_packet {
   95:   u8 op, htype, hlen, hops;
   96:   u32 xid;
   97:   u16 secs, flags;
   98:   struct in_addr ciaddr, yiaddr, siaddr, giaddr;
   99:   u8 chaddr[DHCP_CHADDR_MAX], sname[64], file[128];
  100:   u8 options[312];
  101: };