/*
* Packet Headers
* Copyright (C) 2003, 2004, 2005 Mondru AB.
* Copyright (c) 2007 David Bird <david@coova.com>
*
* The contents of this file may be used under the terms of the GNU
* General Public License Version 2, provided that the above copyright
* notice and this permission notice is included in all copies or
* substantial portions of the software.
*
* The initial developer of the original code is
* Jens Jakobsen <jj@chillispot.org>
*
*/
#ifndef _PKT_H
#define _PKT_H
#define PKT_ETH_ALEN 6 /* Ethernet Address Length */
#define PKT_ETH_HLEN 14 /* Ethernet Header Length */
#define PKT_ETH_PROTO_IP 0x0800
#define PKT_ETH_PROTO_ARP 0x0806
#define PKT_ETH_PROTO_EAPOL 0x888e
#define PKT_IP_PLEN 1500 /* IP Payload Length */
#define PKT_IP_VER_HLEN 0x45
#define PKT_IP_ALEN 4
#define PKT_IP_HLEN 20
#define PKT_IP_PROTO_ICMP 1 /* ICMP Protocol number */
#define PKT_IP_PROTO_TCP 6 /* TCP Protocol number */
#define PKT_IP_PROTO_UDP 17 /* UDP Protocol number */
#define PKT_IP_PROTO_GRE 47 /* GRE Protocol number */
#define PKT_UDP_HLEN 8
#define PKT_EAP_PLEN 1500 /* Dot1x Payload length */
#define DHCP_TAG_VLEN 255 /* Tag value always shorter than this */
#define EAPOL_TAG_VLEN 255 /* Tag value always shorter than this */
#define DHCP_HTYPE_ETH 1
#define DHCP_CHADDR_LEN 16 /* Length of client hardware address */
#define DHCP_SNAME_LEN 64 /* Length of server host name */
#define DHCP_FILE_LEN 128 /* Length of boot file name*/
#define DHCP_OPTIONS_LEN 312 /* Length of optional parameters field */
#define DHCP_MIN_LEN 28+16+64+128 /* Length of packet excluding options */
#define DHCP_LEN DHCP_MIN_LEN + DHCP_OPTIONS_LEN
struct pkt_ethhdr_t {
uint8_t dst[PKT_ETH_ALEN];
uint8_t src[PKT_ETH_ALEN];
uint16_t prot;
} __attribute__((packed));
struct pkt_iphdr_t {
uint8_t version_ihl;
uint8_t tos;
uint16_t tot_len;
uint16_t id;
uint16_t frag_off;
uint8_t ttl;
uint8_t protocol;
uint16_t check;
uint32_t saddr;
uint32_t daddr;
} __attribute__((packed));
struct pkt_ipphdr_t {
/* Convenience structure:
Same as pkt_iphdr_t, but also
with ports (UDP and TCP packets) */
uint8_t version_ihl;
uint8_t tos;
uint16_t tot_len;
uint16_t id;
uint16_t frag_off;
uint8_t ttl;
uint8_t protocol;
uint16_t check;
uint32_t saddr;
uint32_t daddr;
uint16_t sport;
uint16_t dport;
} __attribute__((packed));
struct pkt_ippacket_t {
struct pkt_ethhdr_t ethh;
struct pkt_iphdr_t iph;
uint8_t payload[PKT_IP_PLEN];
} __attribute__((packed));
/*
0 7 8 15 16 23 24 31
+--------+--------+--------+--------+
| Source | Destination |
| Port | Port |
+--------+--------+--------+--------+
| | |
| Length | Checksum |
+--------+--------+--------+--------+
|
| data octets ...
+---------------- ...
User Datagram Header Format
*/
struct pkt_udphdr_t {
uint16_t src;
uint16_t dst;
uint16_t len;
uint16_t check;
} __attribute__((packed));
/*
TCP Header Format
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Source Port | Destination Port |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Sequence Number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Acknowledgment Number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Data | |U|A|P|R|S|F| |
| Offset| Reserved |R|C|S|S|Y|I| Window |
| | |G|K|H|T|N|N| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Checksum | Urgent Pointer |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Options | Padding |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| data |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
struct pkt_tcphdr_t {
uint16_t src;
uint16_t dst;
uint32_t seq;
uint32_t ack;
uint16_t flags;
uint16_t win;
uint16_t check;
uint16_t urgent;
uint32_t options;
} __attribute__((packed));
/*
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| op (1) | htype (1) | hlen (1) | hops (1) |
+---------------+---------------+---------------+---------------+
| xid (4) |
+-------------------------------+-------------------------------+
| secs (2) | flags (2) |
+-------------------------------+-------------------------------+
| ciaddr (4) |
+---------------------------------------------------------------+
| yiaddr (4) |
+---------------------------------------------------------------+
| siaddr (4) |
+---------------------------------------------------------------+
| giaddr (4) |
+---------------------------------------------------------------+
| |
| chaddr (16) |
| |
| |
+---------------------------------------------------------------+
| |
| sname (64) |
+---------------------------------------------------------------+
| |
| file (128) |
+---------------------------------------------------------------+
| |
| options (variable) |
+---------------------------------------------------------------+
*/
struct dhcp_packet_t { /* From RFC 2131 */
uint8_t op; /* 1 Message op code / message type. 1 = BOOTREQUEST, 2 = BOOTREPLY */
uint8_t htype; /* 1 Hardware address type, see ARP section in "Assigned Numbers" RFC */
uint8_t hlen; /* 1 Hardware address length (e.g. '6' for 10mb ethernet).*/
uint8_t hops; /* 1 Client sets to zero, optionally used by relay agents when booting via a relay agent.*/
uint32_t xid; /* 4 Transaction ID, a random number chosen by the client, used by the client and
server to associate messages and responses between a client and a server. */
uint16_t secs; /* 2 Filled in by client, seconds elapsed since client began address acquisition or renewal process.*/
uint8_t flags[2]; /* 2 Flags (see figure 2).*/
uint32_t ciaddr; /* 4 Client IP address; only filled in if client is in BOUND, RENEW or REBINDING state
and can respond to ARP requests.*/
uint32_t yiaddr; /* 4 'your' (client) IP address.*/
uint32_t siaddr; /* 4 IP address of next server to use in bootstrap; returned in DHCPOFFER, DHCPACK by server.*/
uint32_t giaddr; /* 4 Relay agent IP address, used in booting via a relay agent.*/
uint8_t chaddr[DHCP_CHADDR_LEN]; /* 16 Client hardware address.*/
uint8_t sname[DHCP_SNAME_LEN]; /* 64 Optional server host name, null terminated string.*/
uint8_t file[DHCP_FILE_LEN]; /* 128 Boot file name, null terminated string; "generic" name or null in
DHCPDISCOVER, fully qualified directory-path name in DHCPOFFER.*/
uint8_t options[DHCP_OPTIONS_LEN]; /* var Optional parameters field. See the options documents for a list
of defined options.*/
} __attribute__((packed));
struct dhcp_fullpacket_t {
struct pkt_ethhdr_t ethh;
struct pkt_iphdr_t iph;
struct pkt_udphdr_t udph;
struct dhcp_packet_t dhcp;
} __attribute__((packed));
struct dhcp_tag_t {
uint8_t t;
uint8_t l;
uint8_t v[DHCP_TAG_VLEN];
} __attribute__((packed));
struct arp_packet_t { /* From RFC 826 */
uint16_t hrd; /* 16.bit: (ar$hrd) Hardware address space (e.g.,
Ethernet, Packet Radio Net.) */
uint16_t pro; /* 16.bit: (ar$pro) Protocol address space. For
Ethernet hardware, this is from the set of type
fields ether_typ$<protocol>. */
uint8_t hln; /* 8.bit: (ar$hln) byte length of each hardware address */
uint8_t pln; /* 8.bit: (ar$pln) byte length of each protocol address */
uint16_t op; /* 16.bit: (ar$op) opcode (ares_op$REQUEST | ares_op$REPLY) */
uint8_t sha[PKT_ETH_ALEN]; /* nbytes: (ar$sha) Hardware address of
sender of this packet, n from the ar$hln field. */
uint8_t spa[PKT_IP_ALEN]; /* mbytes: (ar$spa) Protocol address of
sender of this packet, m from the ar$pln field. */
uint8_t tha[PKT_ETH_ALEN]; /* nbytes: (ar$tha) Hardware address of
target of this packet (if known). */
uint8_t tpa[PKT_IP_ALEN]; /* mbytes: (ar$tpa) Protocol address of
target.*/
} __attribute__((packed));
struct arp_fullpacket_t {
struct pkt_ethhdr_t ethh;
struct arp_packet_t arp;
} __attribute__((packed));
struct dns_packet_t { /* From RFC 1035 */
uint16_t id; /* 16 bit: Generated by requester. Copied in reply */
uint16_t flags; /* 16 bit: Flags */
uint16_t qdcount; /* 16 bit: Number of questions */
uint16_t ancount; /* 16 bit: Number of answer records */
uint16_t nscount; /* 16 bit: Number of name servers */
uint16_t arcount; /* 16 bit: Number of additional records */
uint8_t records[PKT_IP_PLEN];
} __attribute__((packed));
struct dns_fullpacket_t {
struct pkt_ethhdr_t ethh;
struct pkt_iphdr_t iph;
struct pkt_udphdr_t udph;
struct dns_packet_t dns;
} __attribute__((packed));
struct pkt_dot1xhdr_t {
uint8_t ver;
uint8_t type;
uint16_t len;
} __attribute__((packed));
struct eap_packet_t {
uint8_t code;
uint8_t id;
uint16_t length;
uint8_t type;
uint8_t payload[PKT_EAP_PLEN];
} __attribute__((packed));
struct dot1xpacket_t {
struct pkt_ethhdr_t ethh;
struct pkt_dot1xhdr_t dot1x;
struct eap_packet_t eap;
} __attribute__((packed));
struct eapol_tag_t {
uint8_t t;
uint8_t l;
uint8_t v[EAPOL_TAG_VLEN];
} __attribute__((packed));
int chksum(struct pkt_iphdr_t *iph);
#endif
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