/* ip.h - IP_HLEN, IP_CLASS{A,B,C,D,E} */
/* Internet Protocol (IP) Constants and Datagram Format */
#define IP_ALEN 4 /* IP address length in bytes (octets) */
typedef unsigned long IPaddr; /* internet address */
#if BYTE_ORDER == BIG_ENDIAN
#define IP_CLASSA(x) (((x) & 0x80000000) == 0) /* IP Class A */
#define IP_CLASSB(x) (((x) & 0xc0000000) == 0x80000000) /* IP Class B */
#define IP_CLASSC(x) (((x) & 0xe0000000) == 0xc0000000) /* IP Class C */
#define IP_CLASSD(x) (((x) & 0xf0000000) == 0xe0000000) /* IP Class D */
#define IP_CLASSE(x) (((x) & 0xf8000000) == 0xf0000000) /* IP Class E */
#else /* BYTE_ORDER */
#define IP_CLASSA(x) (((x) & 0x80) == 0x00) /* IP Class A address */
#define IP_CLASSB(x) (((x) & 0xc0) == 0x80) /* IP Class B address */
#define IP_CLASSC(x) (((x) & 0xe0) == 0xc0) /* IP Class C address */
#define IP_CLASSD(x) (((x) & 0xf0) == 0xe0) /* IP Class D address */
#define IP_CLASSE(x) (((x) & 0xf8) == 0xf0) /* IP Class E address */
#endif /* BYTE_ORDER */
/* Some Assigned Protocol Numbers */
#define IPT_ICMP 1 /* protocol type for ICMP packets */
#define IPT_IGMP 2 /* protocol type for IGMP packets */
#define IPT_TCP 6 /* protocol type for TCP packets */
#define IPT_EGP 8 /* protocol type for EGP packets */
#define IPT_UDP 17 /* protocol type for UDP packets */
#define IPT_OSPF 89 /* protocol type for OSPF packets */
struct ip {
u_char ip_verlen; /* IP version & header length (in longs)*/
u_char ip_tos; /* type of service */
u_short ip_len; /* total packet length (in octets) */
short ip_id; /* datagram id */
short ip_fragoff; /* fragment offset (in 8-octet's) */
u_char ip_ttl; /* time to live, in gateway hops */
u_char ip_proto; /* IP protocol (see IPT_* above) */
short ip_cksum; /* header checksum */
IPaddr ip_src; /* IP address of source */
IPaddr ip_dst; /* IP address of destination */
u_char ip_data[1]; /* variable length data */
};
#define IP_VERSION 4 /* current version value */
#define IP_MINHLEN 5 /* minimum IP header length (in longs) */
#define IP_TTL 255 /* Initial time-to-live value */
#define IP_MF 0x2000 /* more fragments bit */
#define IP_DF 0x4000 /* don't fragment bit */
#define IP_FRAGOFF 0x1fff /* fragment offset mask */
#define IP_PREC 0xe0 /* precedence portion of TOS */
/* IP Precedence values */
#define IPP_NETCTL 0xe0 /* network control */
#define IPP_INCTL 0xc0 /* internet control */
#define IPP_CRIT 0xa0 /* critical */
#define IPP_FLASHO 0x80 /* flash over-ride */
#define IPP_FLASH 0x60 /* flash */
#define IPP_IMMED 0x40 /* immediate */
#define IPP_PRIO 0x20 /* priority */
#define IPP_NORMAL 0x00 /* normal */
/* macro to compute a datagram's header length (in bytes) */
#define IP_HLEN(pip) ((pip->ip_verlen & 0xf) #define IPMHLEN 20 /* minimum IP header length (in bytes) */
/* IP options */
#define IPO_COPY 0x80 /* copy on fragment mask */
#define IPO_CLASS 0x60 /* option class */
#define IPO_NUM 0x17 /* option number */
#define IPO_EOOP 0x00 /* end of options */
#define IPO_NOP 0x01 /* no operation */
#define IPO_SEC 0x82 /* DoD security/compartmentalization */
#define IPO_LSRCRT 0x83 /* loose source routing */
#define IPO_SSRCRT 0x89 /* strict source routing */
#define IPO_RECRT 0x07 /* record route */
#define IPO_STRID 0x88 /* stream ID */
#define IPO_TIME 0x44 /* internet timestamp */
#define IP_MAXLEN BPMAXB-EP_HLEN /* Maximum IP datagram length */
/* IP process info */
extern PROCESS ipproc();
#define IPSTK 512 /* stack size for IP process */
#define IPPRI 100 /* IP runs at high priority */
#define IPNAM "ip" /* name of IP process */
#define IPARGC 0 /* count of args to IP */
extern IPaddr ip_maskall; /* = 255.255.255.255 */
extern IPaddr ip_anyaddr; /* = 0.0.0.0 */
extern IPaddr ip_loopback; /* = 127.0.0.1 */
extern int ippid, gateway;
struct ip *iph2net(struct ip *), *ipnet2h(struct ip *);
unsigned short cksum(WORD *, unsigned);
int ipsend(IPaddr, struct ep *, unsigned, u_char, u_char, u_char);
int ipputp(unsigned, IPaddr, struct ep *);
Bool isbrc(IPaddr);
