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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 {
1.1.1.3 ! root 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 */
1.1 root 123: } __attribute__ ((__packed__)) n_eth_hdr_t;
124:
1.1.1.3 ! root 125: /* 802.1Q Ethernet Header */
! 126: typedef struct {
! 127: n_eth_addr_t daddr; /* destination eth addr */
! 128: n_eth_addr_t saddr; /* source ether addr */
! 129: m_uint16_t type; /* packet type ID field (0x8100) */
! 130: m_uint16_t vlan_id; /* VLAN id + CoS */
! 131: } __attribute__ ((__packed__)) n_eth_dot1q_hdr_t;
! 132:
1.1 root 133: /* LLC header */
134: typedef struct {
135: m_uint8_t dsap;
136: m_uint8_t ssap;
137: m_uint8_t ctrl;
138: } __attribute__ ((__packed__)) n_eth_llc_hdr_t;
139:
140: /* SNAP header */
141: typedef struct {
142: m_uint8_t oui[3];
143: m_uint16_t type;
144: } __attribute__ ((__packed__)) n_eth_snap_hdr_t;
145:
146: /* Cisco ISL header */
147: typedef struct {
148: m_uint16_t hsa1; /* High bits of source MAC address */
149: m_uint8_t hsa2; /* (in theory: 0x00-00-0c) */
150: m_uint16_t vlan; /* VLAN + BPDU */
151: m_uint16_t index; /* Index port of source */
152: m_uint16_t res; /* Reserved for TokenRing and FDDI */
153: } __attribute__ ((__packed__)) n_eth_isl_hdr_t;
154:
155: #define N_ISL_HDR_SIZE (sizeof(n_eth_llc_hdr_t) + sizeof(n_eth_isl_hdr_t))
156:
157: /* Check for a broadcast/multicast ethernet address */
158: static inline int eth_addr_is_mcast(n_eth_addr_t *addr)
159: {
160: return(addr->eth_addr_byte[0] & 1);
161: }
162:
1.1.1.3 ! root 163: /* Check for Cisco ISL destination address */
! 164: static inline int eth_addr_is_cisco_isl(n_eth_addr_t *addr)
! 165: {
! 166: static const char *isl_addr = "\x01\x00\x0c\x00\x00";
! 167: return(!memcmp(addr,isl_addr,5)); /* only 40 bits to compare */
! 168: }
! 169:
! 170: /* Check for a SNAP header */
! 171: static inline int eth_llc_check_snap(n_eth_llc_hdr_t *llc_hdr)
! 172: {
! 173: return((llc_hdr->dsap == 0xAA) &&
! 174: (llc_hdr->ssap == 0xAA) &&
! 175: (llc_hdr->ctrl == 0x03));
! 176: }
! 177:
1.1 root 178: /* Number of bits in a contiguous netmask */
179: static inline int ip_bits_mask(n_ip_addr_t mask)
180: {
181: int prefix = 0;
182:
183: while(mask) {
184: prefix++;
185: mask = mask & (mask - 1);
186: }
187: return(prefix);
188: }
189:
190: /* Initialize IPv6 masks */
191: void ipv6_init_masks(void);
192:
193: /* Convert an IPv4 address into a string */
1.1.1.2 root 194: char *n_ip_ntoa(char *buffer,n_ip_addr_t ip_addr);
1.1 root 195:
196: /* Convert in IPv6 address into a string */
1.1.1.2 root 197: char *n_ipv6_ntoa(char *buffer,n_ipv6_addr_t *ipv6_addr);
1.1 root 198:
199: /* Convert a string containing an IP address in binary */
1.1.1.2 root 200: int n_ip_aton(n_ip_addr_t *ip_addr,char *ip_str);
1.1 root 201:
202: /* Convert an IPv6 address from string into binary */
1.1.1.2 root 203: int n_ipv6_aton(n_ipv6_addr_t *ipv6_addr,char *ip_str);
1.1 root 204:
205: /* Parse an IPv4 CIDR prefix */
206: int ip_parse_cidr(char *token,n_ip_addr_t *net_addr,n_ip_addr_t *net_mask);
207:
208: /* Parse an IPv6 CIDR prefix */
209: int ipv6_parse_cidr(char *token,n_ipv6_addr_t *net_addr,u_int *net_mask);
210:
1.1.1.3 ! root 211: /* Parse a MAC address */
! 212: int parse_mac_addr(n_eth_addr_t *addr,char *str);
! 213:
! 214: /* Convert an Ethernet address into a string */
! 215: char *n_eth_ntoa(char *buffer,n_eth_addr_t *addr,int format);
! 216:
1.1 root 217: /* Create a new socket to connect to specified host */
218: int udp_connect(int local_port,char *remote_host,int remote_port);
219:
1.1.1.3 ! root 220: /* Listen on the specified port */
! 221: int ip_listen(int port,int sock_type,int max_fd,int fd_array[]);
! 222:
1.1 root 223: #endif
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