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1.1 root 1: /*
2: * Copyright (c) 2006 Christophe Fillot.
3: * E-mail: [email protected]
4: *
5: * net.h: Protocol Headers and Constants Definitions.
6: */
7:
8: #ifndef __NET_H__
9: #define __NET_H__ 1
10:
11: #include "utils.h"
12:
13: #define N_IP_ADDR_LEN 4
14: #define N_IP_ADDR_BITS 32
15:
16: #define N_IPV6_ADDR_LEN 16
17: #define N_IPV6_ADDR_BITS 128
18:
19: /* IPv4 Address definition */
20: typedef m_uint32_t n_ip_addr_t;
21:
22: /* IP Network definition */
23: typedef struct {
24: n_ip_addr_t net_addr;
25: n_ip_addr_t net_mask;
26: }n_ip_network_t;
27:
28: /* IPv6 Address definition */
29: typedef struct {
30: union {
31: m_uint32_t u6_addr32[4];
32: m_uint16_t u6_addr16[8];
33: m_uint8_t u6_addr8[16];
34: }ip6;
35: }n_ipv6_addr_t;
36:
37: /* IPv6 Network definition */
38: typedef struct {
39: n_ipv6_addr_t net_addr;
40: u_int net_mask;
41: }n_ipv6_network_t;
42:
43: /* IP: Common Protocols */
44: #define N_IP_PROTO_ICMP 1
45: #define N_IP_PROTO_IGMP 2
46: #define N_IP_PROTO_TCP 6
47: #define N_IP_PROTO_UDP 17
48: #define N_IP_PROTO_IPV6 41
49: #define N_IP_PROTO_GRE 47
50: #define N_IP_PROTO_ESP 50
51: #define N_IP_PROTO_AH 51
52: #define N_IP_PROTO_ICMPV6 58
53: #define N_IP_PROTO_EIGRP 88
54: #define N_IP_PROTO_OSPF 89
55: #define N_IP_PROTO_PIM 103
56: #define N_IP_PROTO_SCTP 132
57: #define N_IP_PROTO_MAX 256
58:
59: #define N_IP_OFFMASK 0x1fff
60:
61: /* Maximum number of ports */
62: #define N_IP_PORT_MAX 65536
63:
64: /* TCP: Header Flags */
65: #define N_TCP_FIN 0x01
66: #define N_TCP_SYN 0x02
67: #define N_TCP_RST 0x04
68: #define N_TCP_PUSH 0x08
69: #define N_TCP_ACK 0x10
70: #define N_TCP_URG 0x20
71:
72: #define N_TCP_FLAGMASK 0x3F
73:
74: /* IPv6 Header Codes */
75: #define N_IPV6_PROTO_ICMP 58
76: #define N_IPV6_OPT_HOP_BY_HOP 0 /* Hop-by-Hop header */
77: #define N_IPV6_OPT_DST 60 /* Destination Options Header */
78: #define N_IPV6_OPT_ROUTE 43 /* Routing header */
79: #define N_IPV6_OPT_FRAG 44 /* Fragment Header */
80: #define N_IPV6_OPT_AH 51 /* Authentication Header */
81: #define N_IPV6_OPT_ESP 50 /* Encryption Security Payload */
82: #define N_IPV6_OPT_COMP 108 /* Payload Compression Protocol */
83: #define N_IPV6_OPT_END 59 /* No more headers */
84:
85: /* Standard Ethernet MTU */
86: #define N_ETH_MTU 1500
87:
88: /* Ethernet Constants */
89: #define N_ETH_ALEN 6
90: #define N_ETH_HLEN sizeof(n_eth_hdr_t)
91:
92: /* Minimum size for ethernet payload */
93: #define N_ETH_MIN_DATA_LEN 46
94: #define N_ETH_MIN_FRAME_LEN (N_ETH_MIN_DATA_LEN + N_ETH_HLEN)
95:
96: #define N_ETH_PROTO_IP 0x0800
97: #define N_ETH_PROTO_IPV6 0x86DD
98: #define N_ETH_PROTO_ARP 0x0806
99: #define N_ETH_PROTO_DOT1Q 0x8100
100: #define N_ETH_PROTO_DOT1Q_2 0x9100
101: #define N_ETH_PROTO_DOT1Q_3 0x9200
102: #define N_ETH_PROTO_MPLS 0x8847
103: #define N_ETH_PROTO_MPLS_MC 0x8848
104: #define N_ETH_PROTO_LOOP 0x9000
105:
106: /* size needed for a string buffer */
107: #define N_ETH_SLEN (N_ETH_ALEN*3)
108:
109: /* ARP opcodes */
110: #define N_ARP_REQUEST 0x1
111: #define N_ARP_REPLY 0x2
112:
113: /* Ethernet Address */
114: typedef struct {
115: m_uint8_t eth_addr_byte[N_ETH_ALEN];
116: } __attribute__ ((__packed__)) n_eth_addr_t;
117:
118: /* Ethernet Header */
119: typedef struct {
120: n_eth_addr_t daddr; /* destination eth addr */
121: n_eth_addr_t saddr; /* source ether addr */
122: m_uint16_t type; /* packet type ID field */
123: } __attribute__ ((__packed__)) n_eth_hdr_t;
124:
125: /* LLC header */
126: typedef struct {
127: m_uint8_t dsap;
128: m_uint8_t ssap;
129: m_uint8_t ctrl;
130: } __attribute__ ((__packed__)) n_eth_llc_hdr_t;
131:
132: /* SNAP header */
133: typedef struct {
134: m_uint8_t oui[3];
135: m_uint16_t type;
136: } __attribute__ ((__packed__)) n_eth_snap_hdr_t;
137:
138: /* Cisco ISL header */
139: typedef struct {
140: m_uint16_t hsa1; /* High bits of source MAC address */
141: m_uint8_t hsa2; /* (in theory: 0x00-00-0c) */
142: m_uint16_t vlan; /* VLAN + BPDU */
143: m_uint16_t index; /* Index port of source */
144: m_uint16_t res; /* Reserved for TokenRing and FDDI */
145: } __attribute__ ((__packed__)) n_eth_isl_hdr_t;
146:
147: #define N_ISL_HDR_SIZE (sizeof(n_eth_llc_hdr_t) + sizeof(n_eth_isl_hdr_t))
148:
149: /* Check for a broadcast/multicast ethernet address */
150: static inline int eth_addr_is_mcast(n_eth_addr_t *addr)
151: {
152: return(addr->eth_addr_byte[0] & 1);
153: }
154:
155: /* Number of bits in a contiguous netmask */
156: static inline int ip_bits_mask(n_ip_addr_t mask)
157: {
158: int prefix = 0;
159:
160: while(mask) {
161: prefix++;
162: mask = mask & (mask - 1);
163: }
164: return(prefix);
165: }
166:
167: /* Initialize IPv6 masks */
168: void ipv6_init_masks(void);
169:
170: /* Convert an IPv4 address into a string */
171: char *ip_ntoa(char *buffer,n_ip_addr_t ip_addr);
172:
173: /* Convert in IPv6 address into a string */
174: char *ipv6_ntoa(char *buffer,n_ipv6_addr_t *ipv6_addr);
175:
176: /* Convert a string containing an IP address in binary */
177: int ip_aton(n_ip_addr_t *ip_addr,char *ip_str);
178:
179: /* Convert an IPv6 address from string into binary */
180: int ipv6_aton(n_ipv6_addr_t *ipv6_addr,char *ip_str);
181:
182: /* Parse an IPv4 CIDR prefix */
183: int ip_parse_cidr(char *token,n_ip_addr_t *net_addr,n_ip_addr_t *net_mask);
184:
185: /* Parse an IPv6 CIDR prefix */
186: int ipv6_parse_cidr(char *token,n_ipv6_addr_t *net_addr,u_int *net_mask);
187:
188: /* Create a new socket to connect to specified host */
189: int udp_connect(int local_port,char *remote_host,int remote_port);
190:
191: #endif
This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.