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eeabdc9b78
At least some versions of GCC will, on SPARC, generate code for
if (bp->bp_htype == 1 && bp->bp_hlen == 6 && bp->bp_op == BOOTPREQUEST) {
where bp is a pointer to a struct bootp, that loads the first 4-byte
word in that structure, masks out the field in that structure that's not
being compared, and compares against a word with the appropriate values
in the other fields. That won't work, because there's no guarantee that
bp points to a value aligned on a 4-byte boundary.
Declaring "struct bootp" to be packed appears to keep at least GCC 4.2.4
from performing that optimization; we define an "UNALIGNED" tag to apply
to structures to prevent that optimization, and apply that tag to the
structures in bootp.h. (We'll apply it to other structures as we
discover the need for it.)
232 lines
8.0 KiB
C
232 lines
8.0 KiB
C
/* @(#) $Header: /tcpdump/master/tcpdump/bootp.h,v 1.19 2008-04-22 09:46:03 hannes Exp $ (LBL) */
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/*
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* Bootstrap Protocol (BOOTP). RFC951 and RFC1048.
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*
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* This file specifies the "implementation-independent" BOOTP protocol
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* information which is common to both client and server.
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*
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* Copyright 1988 by Carnegie Mellon.
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*
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* Permission to use, copy, modify, and distribute this program for any
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* purpose and without fee is hereby granted, provided that this copyright
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* and permission notice appear on all copies and supporting documentation,
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* the name of Carnegie Mellon not be used in advertising or publicity
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* pertaining to distribution of the program without specific prior
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* permission, and notice be given in supporting documentation that copying
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* and distribution is by permission of Carnegie Mellon and Stanford
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* University. Carnegie Mellon makes no representations about the
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* suitability of this software for any purpose. It is provided "as is"
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* without express or implied warranty.
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*/
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struct bootp {
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u_int8_t bp_op; /* packet opcode type */
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u_int8_t bp_htype; /* hardware addr type */
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u_int8_t bp_hlen; /* hardware addr length */
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u_int8_t bp_hops; /* gateway hops */
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u_int32_t bp_xid; /* transaction ID */
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u_int16_t bp_secs; /* seconds since boot began */
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u_int16_t bp_flags; /* flags - see bootp_flag_values[]
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in print-bootp.c */
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struct in_addr bp_ciaddr; /* client IP address */
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struct in_addr bp_yiaddr; /* 'your' IP address */
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struct in_addr bp_siaddr; /* server IP address */
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struct in_addr bp_giaddr; /* gateway IP address */
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u_int8_t bp_chaddr[16]; /* client hardware address */
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u_int8_t bp_sname[64]; /* server host name */
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u_int8_t bp_file[128]; /* boot file name */
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u_int8_t bp_vend[64]; /* vendor-specific area */
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} UNALIGNED;
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/*
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* UDP port numbers, server and client.
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*/
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#define IPPORT_BOOTPS 67
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#define IPPORT_BOOTPC 68
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#define BOOTPREPLY 2
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#define BOOTPREQUEST 1
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/*
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* Vendor magic cookie (v_magic) for CMU
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*/
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#define VM_CMU "CMU"
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/*
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* Vendor magic cookie (v_magic) for RFC1048
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*/
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#define VM_RFC1048 { 99, 130, 83, 99 }
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/*
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* RFC1048 tag values used to specify what information is being supplied in
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* the vendor field of the packet.
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*/
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#define TAG_PAD ((u_int8_t) 0)
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#define TAG_SUBNET_MASK ((u_int8_t) 1)
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#define TAG_TIME_OFFSET ((u_int8_t) 2)
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#define TAG_GATEWAY ((u_int8_t) 3)
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#define TAG_TIME_SERVER ((u_int8_t) 4)
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#define TAG_NAME_SERVER ((u_int8_t) 5)
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#define TAG_DOMAIN_SERVER ((u_int8_t) 6)
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#define TAG_LOG_SERVER ((u_int8_t) 7)
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#define TAG_COOKIE_SERVER ((u_int8_t) 8)
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#define TAG_LPR_SERVER ((u_int8_t) 9)
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#define TAG_IMPRESS_SERVER ((u_int8_t) 10)
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#define TAG_RLP_SERVER ((u_int8_t) 11)
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#define TAG_HOSTNAME ((u_int8_t) 12)
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#define TAG_BOOTSIZE ((u_int8_t) 13)
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#define TAG_END ((u_int8_t) 255)
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/* RFC1497 tags */
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#define TAG_DUMPPATH ((u_int8_t) 14)
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#define TAG_DOMAINNAME ((u_int8_t) 15)
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#define TAG_SWAP_SERVER ((u_int8_t) 16)
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#define TAG_ROOTPATH ((u_int8_t) 17)
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#define TAG_EXTPATH ((u_int8_t) 18)
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/* RFC2132 */
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#define TAG_IP_FORWARD ((u_int8_t) 19)
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#define TAG_NL_SRCRT ((u_int8_t) 20)
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#define TAG_PFILTERS ((u_int8_t) 21)
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#define TAG_REASS_SIZE ((u_int8_t) 22)
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#define TAG_DEF_TTL ((u_int8_t) 23)
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#define TAG_MTU_TIMEOUT ((u_int8_t) 24)
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#define TAG_MTU_TABLE ((u_int8_t) 25)
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#define TAG_INT_MTU ((u_int8_t) 26)
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#define TAG_LOCAL_SUBNETS ((u_int8_t) 27)
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#define TAG_BROAD_ADDR ((u_int8_t) 28)
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#define TAG_DO_MASK_DISC ((u_int8_t) 29)
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#define TAG_SUPPLY_MASK ((u_int8_t) 30)
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#define TAG_DO_RDISC ((u_int8_t) 31)
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#define TAG_RTR_SOL_ADDR ((u_int8_t) 32)
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#define TAG_STATIC_ROUTE ((u_int8_t) 33)
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#define TAG_USE_TRAILERS ((u_int8_t) 34)
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#define TAG_ARP_TIMEOUT ((u_int8_t) 35)
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#define TAG_ETH_ENCAP ((u_int8_t) 36)
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#define TAG_TCP_TTL ((u_int8_t) 37)
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#define TAG_TCP_KEEPALIVE ((u_int8_t) 38)
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#define TAG_KEEPALIVE_GO ((u_int8_t) 39)
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#define TAG_NIS_DOMAIN ((u_int8_t) 40)
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#define TAG_NIS_SERVERS ((u_int8_t) 41)
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#define TAG_NTP_SERVERS ((u_int8_t) 42)
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#define TAG_VENDOR_OPTS ((u_int8_t) 43)
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#define TAG_NETBIOS_NS ((u_int8_t) 44)
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#define TAG_NETBIOS_DDS ((u_int8_t) 45)
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#define TAG_NETBIOS_NODE ((u_int8_t) 46)
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#define TAG_NETBIOS_SCOPE ((u_int8_t) 47)
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#define TAG_XWIN_FS ((u_int8_t) 48)
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#define TAG_XWIN_DM ((u_int8_t) 49)
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#define TAG_NIS_P_DOMAIN ((u_int8_t) 64)
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#define TAG_NIS_P_SERVERS ((u_int8_t) 65)
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#define TAG_MOBILE_HOME ((u_int8_t) 68)
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#define TAG_SMPT_SERVER ((u_int8_t) 69)
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#define TAG_POP3_SERVER ((u_int8_t) 70)
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#define TAG_NNTP_SERVER ((u_int8_t) 71)
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#define TAG_WWW_SERVER ((u_int8_t) 72)
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#define TAG_FINGER_SERVER ((u_int8_t) 73)
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#define TAG_IRC_SERVER ((u_int8_t) 74)
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#define TAG_STREETTALK_SRVR ((u_int8_t) 75)
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#define TAG_STREETTALK_STDA ((u_int8_t) 76)
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/* DHCP options */
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#define TAG_REQUESTED_IP ((u_int8_t) 50)
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#define TAG_IP_LEASE ((u_int8_t) 51)
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#define TAG_OPT_OVERLOAD ((u_int8_t) 52)
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#define TAG_TFTP_SERVER ((u_int8_t) 66)
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#define TAG_BOOTFILENAME ((u_int8_t) 67)
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#define TAG_DHCP_MESSAGE ((u_int8_t) 53)
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#define TAG_SERVER_ID ((u_int8_t) 54)
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#define TAG_PARM_REQUEST ((u_int8_t) 55)
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#define TAG_MESSAGE ((u_int8_t) 56)
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#define TAG_MAX_MSG_SIZE ((u_int8_t) 57)
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#define TAG_RENEWAL_TIME ((u_int8_t) 58)
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#define TAG_REBIND_TIME ((u_int8_t) 59)
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#define TAG_VENDOR_CLASS ((u_int8_t) 60)
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#define TAG_CLIENT_ID ((u_int8_t) 61)
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/* RFC 2241 */
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#define TAG_NDS_SERVERS ((u_int8_t) 85)
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#define TAG_NDS_TREE_NAME ((u_int8_t) 86)
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#define TAG_NDS_CONTEXT ((u_int8_t) 87)
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/* RFC 2242 */
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#define TAG_NDS_IPDOMAIN ((u_int8_t) 62)
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#define TAG_NDS_IPINFO ((u_int8_t) 63)
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/* RFC 2485 */
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#define TAG_OPEN_GROUP_UAP ((u_int8_t) 98)
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/* RFC 2563 */
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#define TAG_DISABLE_AUTOCONF ((u_int8_t) 116)
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/* RFC 2610 */
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#define TAG_SLP_DA ((u_int8_t) 78)
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#define TAG_SLP_SCOPE ((u_int8_t) 79)
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/* RFC 2937 */
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#define TAG_NS_SEARCH ((u_int8_t) 117)
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/* RFC 3011 */
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#define TAG_IP4_SUBNET_SELECT ((u_int8_t) 118)
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/* RFC 3442 */
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#define TAG_CLASSLESS_STATIC_RT ((u_int8_t) 121)
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#define TAG_CLASSLESS_STA_RT_MS ((u_int8_t) 249)
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/* ftp://ftp.isi.edu/.../assignments/bootp-dhcp-extensions */
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#define TAG_USER_CLASS ((u_int8_t) 77)
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#define TAG_SLP_NAMING_AUTH ((u_int8_t) 80)
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#define TAG_CLIENT_FQDN ((u_int8_t) 81)
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#define TAG_AGENT_CIRCUIT ((u_int8_t) 82)
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#define TAG_AGENT_REMOTE ((u_int8_t) 83)
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#define TAG_AGENT_MASK ((u_int8_t) 84)
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#define TAG_TZ_STRING ((u_int8_t) 88)
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#define TAG_FQDN_OPTION ((u_int8_t) 89)
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#define TAG_AUTH ((u_int8_t) 90)
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#define TAG_VINES_SERVERS ((u_int8_t) 91)
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#define TAG_SERVER_RANK ((u_int8_t) 92)
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#define TAG_CLIENT_ARCH ((u_int8_t) 93)
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#define TAG_CLIENT_NDI ((u_int8_t) 94)
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#define TAG_CLIENT_GUID ((u_int8_t) 97)
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#define TAG_LDAP_URL ((u_int8_t) 95)
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#define TAG_6OVER4 ((u_int8_t) 96)
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#define TAG_PRINTER_NAME ((u_int8_t) 100)
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#define TAG_MDHCP_SERVER ((u_int8_t) 101)
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#define TAG_IPX_COMPAT ((u_int8_t) 110)
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#define TAG_NETINFO_PARENT ((u_int8_t) 112)
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#define TAG_NETINFO_PARENT_TAG ((u_int8_t) 113)
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#define TAG_URL ((u_int8_t) 114)
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#define TAG_FAILOVER ((u_int8_t) 115)
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#define TAG_EXTENDED_REQUEST ((u_int8_t) 126)
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#define TAG_EXTENDED_OPTION ((u_int8_t) 127)
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/* DHCP Message types (values for TAG_DHCP_MESSAGE option) */
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#define DHCPDISCOVER 1
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#define DHCPOFFER 2
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#define DHCPREQUEST 3
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#define DHCPDECLINE 4
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#define DHCPACK 5
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#define DHCPNAK 6
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#define DHCPRELEASE 7
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#define DHCPINFORM 8
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/*
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* "vendor" data permitted for CMU bootp clients.
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*/
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struct cmu_vend {
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u_int8_t v_magic[4]; /* magic number */
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u_int32_t v_flags; /* flags/opcodes, etc. */
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struct in_addr v_smask; /* Subnet mask */
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struct in_addr v_dgate; /* Default gateway */
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struct in_addr v_dns1, v_dns2; /* Domain name servers */
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struct in_addr v_ins1, v_ins2; /* IEN-116 name servers */
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struct in_addr v_ts1, v_ts2; /* Time servers */
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u_int8_t v_unused[24]; /* currently unused */
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} UNALIGNED;
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/* v_flags values */
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#define VF_SMASK 1 /* Subnet mask field contains valid data */
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/* RFC 4702 DHCP Client FQDN Option */
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#define CLIENT_FQDN_FLAGS_S 0x01
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#define CLIENT_FQDN_FLAGS_O 0x02
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#define CLIENT_FQDN_FLAGS_E 0x04
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#define CLIENT_FQDN_FLAGS_N 0x08
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