1 #define RCSIPHDR "$Header: ip.h,v 1.4 85/07/31 09:31:22 walsh Exp $" 2 3 4 struct ip { /* ip leader */ 5 u_char ip_hl:4, /* header length */ 6 #define IP_HLSHIFT 2 7 ip_v:4; /* version */ 8 u_char ip_tos; /* type of service */ 9 #define ip_mff ip_tos /* more fragments flag (input) */ 10 u_short ip_len; /* total length */ 11 u_short ip_id; /* identification */ 12 u_short ip_off; /* fragment offset field */ 13 #define ip_df 0x4000 /* dont fragment flag */ 14 #define ip_mf 0x2000 /* more fragments flag (output) */ 15 #define IP_OFFSHIFT 3 16 u_char ip_ttl; /* time to live */ 17 u_char ip_p; /* protocol */ 18 u_short ip_sum; /* checksum */ 19 #define ip_end ip_sum /* fragment end */ 20 union { 21 struct in_addr ip_s; /* source address */ 22 struct ip *ip_nxt; /* ->next fragment */ 23 } I_sun; 24 #define ip_src I_sun.ip_s 25 #define ip_next I_sun.ip_nxt 26 union { 27 struct in_addr ip_d; /* destination address */ 28 struct ip *ip_prv; /* ->prev fragment */ 29 } I_dun; 30 #define ip_dst I_dun.ip_d 31 #define ip_prev I_dun.ip_prv 32 }; 33 34 /* ip options */ 35 #define IP_OPT_COPY 0x80 /* option copy type flag */ 36 #define IP_OPT_DEBUG 0x40 /* option debug class (2) */ 37 38 #define IP_END_OPT 0 /* end of option list */ 39 #define IP_NOP_OPT 1 /* nop option */ 40 #define IP_SEC_OPT (2+IP_OPT_COPY) /* security option */ 41 #define IP_SEC_OPTLEN 11 /* length */ 42 #define IP_SEC_OPTHDR ((IP_SEC_OPT<<8)|IP_SEC_OPTLEN) /* opt/len */ 43 #define IP_LRTE_OPT (3+IP_OPT_COPY) /* loose source and record route */ 44 #define IP_TIME_OPT (4+IP_OPT_DEBUG)/* timestamp */ 45 #define IP_RRTE_OPT 7 /* record route */ 46 #define IP_STRID_OPT (8+IP_OPT_COPY) /* stream ID */ 47 #define IP_STRID_OPTLEN 4 /* length */ 48 #define IP_STRID_OPTHDR ((IP_STRID_OPT<<8)|IP_STRID_OPTLEN) /* opt/len */ 49 #define IP_SRTE_OPT (9+IP_OPT_COPY) /* strict source and record route */ 50 51 struct ipq { /* ip reass.q header */ 52 struct ip iqx; /* dummy ip element for top of list */ 53 struct ipq *iq_next; /* -> next chain on q */ 54 struct ipq *iq_prev; /* -> prev chain on q */ 55 struct ip iqh; /* fragment header */ 56 u_short iq_size /* maximum fragment size */ 57 }; 58 59 #define IPVERSION 4 /* internet protocol version number */ 60 #define IPMAX 576 /* maximum spec ip packet length */ 61 #define MAXTTL 10 /* maximum time to live (seconds) */ 62 63 /* 64 * ip statistics structure 65 */ 66 67 struct ip_stat { 68 struct in_stat ip_in; 69 #define ip_total ip_in.in_total 70 #define ip_badsum ip_in.in_badsum 71 #define ip_tooshort ip_in.in_tooshort 72 #define ip_drops ip_in.in_drops 73 int ip_forwarded; /* #ip packets not addressed to us */ 74 int ip_broadcast; /* #broadcast packets received */ 75 }; 76 77 78 #ifdef KERNEL 79 80 extern struct ip_stat ipstat; 81 extern struct in_stat otherstat; 82 83 /* 84 * Enqueue a fragment on the reassembly chain. 85 * Can't use insque/remque since prev/next not at head of structure. 86 */ 87 #define ip_enq(p, prev) \ 88 { register struct ip *PREV = prev; \ 89 \ 90 p->ip_prev = PREV; \ 91 p->ip_next = PREV->ip_next; \ 92 PREV->ip_next->ip_prev = p; \ 93 PREV->ip_next = p; \ 94 } 95 96 /* Dequeue a fragment from reassembly chain. */ 97 #define ip_deq(p) \ 98 { \ 99 p->ip_prev->ip_next = p->ip_next; \ 100 p->ip_next->ip_prev = p->ip_prev; \ 101 } 102 #endif 103