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/* |
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* Copyright (c) 2006 Christophe Fillot. |
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* E-mail: cf@utc.fr |
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* |
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* net.h: Protocol Headers and Constants Definitions. |
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*/ |
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|
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#ifndef __NET_H__ |
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#define __NET_H__ 1 |
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|
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#include "utils.h" |
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|
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#define N_IP_ADDR_LEN 4 |
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#define N_IP_ADDR_BITS 32 |
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|
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#define N_IPV6_ADDR_LEN 16 |
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#define N_IPV6_ADDR_BITS 128 |
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|
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/* IPv4 Address definition */ |
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typedef m_uint32_t n_ip_addr_t; |
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|
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/* IP Network definition */ |
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typedef struct { |
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n_ip_addr_t net_addr; |
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n_ip_addr_t net_mask; |
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}n_ip_network_t; |
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|
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/* IPv6 Address definition */ |
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typedef struct { |
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union { |
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m_uint32_t u6_addr32[4]; |
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m_uint16_t u6_addr16[8]; |
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m_uint8_t u6_addr8[16]; |
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}ip6; |
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}n_ipv6_addr_t; |
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|
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/* IPv6 Network definition */ |
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typedef struct { |
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n_ipv6_addr_t net_addr; |
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u_int net_mask; |
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}n_ipv6_network_t; |
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|
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/* IP: Common Protocols */ |
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#define N_IP_PROTO_ICMP 1 |
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#define N_IP_PROTO_IGMP 2 |
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#define N_IP_PROTO_TCP 6 |
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#define N_IP_PROTO_UDP 17 |
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#define N_IP_PROTO_IPV6 41 |
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#define N_IP_PROTO_GRE 47 |
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#define N_IP_PROTO_ESP 50 |
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#define N_IP_PROTO_AH 51 |
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#define N_IP_PROTO_ICMPV6 58 |
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#define N_IP_PROTO_EIGRP 88 |
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#define N_IP_PROTO_OSPF 89 |
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#define N_IP_PROTO_PIM 103 |
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#define N_IP_PROTO_SCTP 132 |
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#define N_IP_PROTO_MAX 256 |
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|
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#define N_IP_OFFMASK 0x1fff |
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|
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/* Maximum number of ports */ |
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#define N_IP_PORT_MAX 65536 |
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|
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/* TCP: Header Flags */ |
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#define N_TCP_FIN 0x01 |
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#define N_TCP_SYN 0x02 |
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#define N_TCP_RST 0x04 |
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#define N_TCP_PUSH 0x08 |
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#define N_TCP_ACK 0x10 |
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#define N_TCP_URG 0x20 |
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|
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#define N_TCP_FLAGMASK 0x3F |
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|
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/* IPv6 Header Codes */ |
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#define N_IPV6_PROTO_ICMP 58 |
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#define N_IPV6_OPT_HOP_BY_HOP 0 /* Hop-by-Hop header */ |
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#define N_IPV6_OPT_DST 60 /* Destination Options Header */ |
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#define N_IPV6_OPT_ROUTE 43 /* Routing header */ |
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#define N_IPV6_OPT_FRAG 44 /* Fragment Header */ |
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#define N_IPV6_OPT_AH 51 /* Authentication Header */ |
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#define N_IPV6_OPT_ESP 50 /* Encryption Security Payload */ |
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#define N_IPV6_OPT_COMP 108 /* Payload Compression Protocol */ |
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#define N_IPV6_OPT_END 59 /* No more headers */ |
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|
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/* Standard Ethernet MTU */ |
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#define N_ETH_MTU 1500 |
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|
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/* Ethernet Constants */ |
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#define N_ETH_ALEN 6 |
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#define N_ETH_HLEN sizeof(n_eth_hdr_t) |
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|
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/* Minimum size for ethernet payload */ |
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#define N_ETH_MIN_DATA_LEN 46 |
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#define N_ETH_MIN_FRAME_LEN (N_ETH_MIN_DATA_LEN + N_ETH_HLEN) |
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|
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#define N_ETH_PROTO_IP 0x0800 |
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#define N_ETH_PROTO_IPV6 0x86DD |
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#define N_ETH_PROTO_ARP 0x0806 |
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#define N_ETH_PROTO_DOT1Q 0x8100 |
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#define N_ETH_PROTO_DOT1Q_2 0x9100 |
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#define N_ETH_PROTO_DOT1Q_3 0x9200 |
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#define N_ETH_PROTO_MPLS 0x8847 |
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#define N_ETH_PROTO_MPLS_MC 0x8848 |
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#define N_ETH_PROTO_LOOP 0x9000 |
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|
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/* size needed for a string buffer */ |
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#define N_ETH_SLEN (N_ETH_ALEN*3) |
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|
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/* ARP opcodes */ |
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#define N_ARP_REQUEST 0x1 |
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#define N_ARP_REPLY 0x2 |
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|
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/* Ethernet Address */ |
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typedef struct { |
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m_uint8_t eth_addr_byte[N_ETH_ALEN]; |
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} __attribute__ ((__packed__)) n_eth_addr_t; |
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|
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/* Ethernet Header */ |
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typedef struct { |
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n_eth_addr_t daddr; /* destination eth addr */ |
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n_eth_addr_t saddr; /* source ether addr */ |
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m_uint16_t type; /* packet type ID field */ |
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} __attribute__ ((__packed__)) n_eth_hdr_t; |
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|
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/* 802.1Q Ethernet Header */ |
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typedef struct { |
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n_eth_addr_t daddr; /* destination eth addr */ |
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n_eth_addr_t saddr; /* source ether addr */ |
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m_uint16_t type; /* packet type ID field (0x8100) */ |
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m_uint16_t vlan_id; /* VLAN id + CoS */ |
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} __attribute__ ((__packed__)) n_eth_dot1q_hdr_t; |
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|
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/* LLC header */ |
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typedef struct { |
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m_uint8_t dsap; |
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m_uint8_t ssap; |
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m_uint8_t ctrl; |
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} __attribute__ ((__packed__)) n_eth_llc_hdr_t; |
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|
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/* SNAP header */ |
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typedef struct { |
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m_uint8_t oui[3]; |
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m_uint16_t type; |
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} __attribute__ ((__packed__)) n_eth_snap_hdr_t; |
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|
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/* Cisco ISL header */ |
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typedef struct { |
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m_uint16_t hsa1; /* High bits of source MAC address */ |
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m_uint8_t hsa2; /* (in theory: 0x00-00-0c) */ |
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m_uint16_t vlan; /* VLAN + BPDU */ |
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m_uint16_t index; /* Index port of source */ |
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m_uint16_t res; /* Reserved for TokenRing and FDDI */ |
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} __attribute__ ((__packed__)) n_eth_isl_hdr_t; |
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|
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#define N_ISL_HDR_SIZE (sizeof(n_eth_llc_hdr_t) + sizeof(n_eth_isl_hdr_t)) |
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|
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/* Cisco SCP/RBCP header */ |
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typedef struct { |
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m_uint8_t sa; /* Source Address */ |
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m_uint8_t da; /* Destination Address */ |
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m_uint16_t len; /* Data Length */ |
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m_uint8_t dsap; /* Destination Service Access Point */ |
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m_uint8_t ssap; /* Source Service Access Point */ |
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m_uint16_t opcode; /* Opcode */ |
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m_uint16_t seqno; /* Sequence Number */ |
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m_uint8_t flags; /* Flags: command/response */ |
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m_uint8_t unk1; /* Unknown */ |
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m_uint16_t unk2; /* Unknown */ |
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m_uint16_t unk3; /* Unknown */ |
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} __attribute__ ((__packed__)) n_scp_hdr_t; |
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|
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/* Check for a broadcast ethernet address */ |
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static inline int eth_addr_is_bcast(n_eth_addr_t *addr) |
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{ |
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static const char *bcast_addr = "\xff\xff\xff\xff\xff\xff"; |
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return(!memcmp(addr,bcast_addr,6)); |
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|
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} |
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|
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/* Check for a broadcast/multicast ethernet address */ |
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static inline int eth_addr_is_mcast(n_eth_addr_t *addr) |
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{ |
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return(addr->eth_addr_byte[0] & 1); |
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} |
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|
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/* Check for Cisco ISL destination address */ |
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static inline int eth_addr_is_cisco_isl(n_eth_addr_t *addr) |
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{ |
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static const char *isl_addr = "\x01\x00\x0c\x00\x00"; |
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return(!memcmp(addr,isl_addr,5)); /* only 40 bits to compare */ |
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} |
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|
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/* Check for a SNAP header */ |
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static inline int eth_llc_check_snap(n_eth_llc_hdr_t *llc_hdr) |
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{ |
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return((llc_hdr->dsap == 0xAA) && |
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(llc_hdr->ssap == 0xAA) && |
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(llc_hdr->ctrl == 0x03)); |
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} |
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|
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/* Number of bits in a contiguous netmask */ |
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static inline int ip_bits_mask(n_ip_addr_t mask) |
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{ |
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int prefix = 0; |
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|
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while(mask) { |
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prefix++; |
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mask = mask & (mask - 1); |
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} |
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return(prefix); |
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} |
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|
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/* Initialize IPv6 masks */ |
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void ipv6_init_masks(void); |
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|
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/* Convert an IPv4 address into a string */ |
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char *n_ip_ntoa(char *buffer,n_ip_addr_t ip_addr); |
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|
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/* Convert in IPv6 address into a string */ |
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char *n_ipv6_ntoa(char *buffer,n_ipv6_addr_t *ipv6_addr); |
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|
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/* Convert a string containing an IP address in binary */ |
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int n_ip_aton(n_ip_addr_t *ip_addr,char *ip_str); |
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|
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/* Convert an IPv6 address from string into binary */ |
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int n_ipv6_aton(n_ipv6_addr_t *ipv6_addr,char *ip_str); |
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|
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/* Parse an IPv4 CIDR prefix */ |
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int ip_parse_cidr(char *token,n_ip_addr_t *net_addr,n_ip_addr_t *net_mask); |
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|
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/* Parse an IPv6 CIDR prefix */ |
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int ipv6_parse_cidr(char *token,n_ipv6_addr_t *net_addr,u_int *net_mask); |
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|
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/* Parse a MAC address */ |
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int parse_mac_addr(n_eth_addr_t *addr,char *str); |
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|
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/* Convert an Ethernet address into a string */ |
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char *n_eth_ntoa(char *buffer,n_eth_addr_t *addr,int format); |
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|
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/* Create a new socket to connect to specified host */ |
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int udp_connect(int local_port,char *remote_host,int remote_port); |
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|
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/* Listen on the specified port */ |
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int ip_listen(char *ip_addr,int port,int sock_type,int max_fd,int fd_array[]); |
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|
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/* ISL rewrite */ |
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void cisco_isl_rewrite(m_uint8_t *pkt,m_uint32_t tot_len); |
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|
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#endif |