1 /* 2 * Copyright (c) 1984, 1985, 1986, 1987 Regents of the University of California. 3 * All rights reserved. The Berkeley software License Agreement 4 * specifies the terms and conditions for redistribution. 5 * 6 * @(#)spp_var.h 7.2 (Berkeley) 11/05/87 7 */ 8 9 /* 10 * Sp control block, one per connection 11 */ 12 struct sppcb { 13 struct spidp_q s_q; /* queue for out-of-order receipt */ 14 struct nspcb *s_nspcb; /* backpointer to internet pcb */ 15 u_char s_state; 16 u_char s_flags; 17 #define SF_ACKNOW 0x01 /* Ack peer immediately */ 18 #define SF_DELACK 0x02 /* Ack, but try to delay it */ 19 #define SF_HI 0x04 /* Show headers on input */ 20 #define SF_HO 0x08 /* Show headers on output */ 21 #define SF_PI 0x10 /* Packet (datagram) interface */ 22 #define SF_WIN 0x20 /* Window info changed */ 23 #define SF_RXT 0x40 /* Rxt info changed */ 24 #define SF_RVD 0x80 /* Calling from read usrreq routine */ 25 u_short s_mtu; /* Max packet size for this stream */ 26 /* use sequence fields in headers to store sequence numbers for this 27 connection */ 28 struct idp *s_idp; 29 struct sphdr s_shdr; /* prototype header to transmit */ 30 #define s_cc s_shdr.sp_cc /* connection control (for EM bit) */ 31 #define s_dt s_shdr.sp_dt /* datastream type */ 32 #define s_sid s_shdr.sp_sid /* source connection identifier */ 33 #define s_did s_shdr.sp_did /* destination connection identifier */ 34 #define s_seq s_shdr.sp_seq /* sequence number */ 35 #define s_ack s_shdr.sp_ack /* acknowledge number */ 36 #define s_alo s_shdr.sp_alo /* allocation number */ 37 #define s_dport s_idp->idp_dna.x_port /* where we are sending */ 38 struct sphdr s_rhdr; /* last received header (in effect!)*/ 39 u_short s_rack; /* their acknowledge number */ 40 u_short s_ralo; /* their allocation number */ 41 u_short s_smax; /* highest packet # we have sent */ 42 u_short s_snxt; /* which packet to send next */ 43 44 /* congestion control */ 45 #define CUNIT 1024 /* scaling for ... */ 46 int s_cwnd; /* Congestion-controlled window */ 47 /* in packets * CUNIT */ 48 short s_swnd; /* == tcp snd_wnd, in packets */ 49 short s_smxw; /* == tcp max_sndwnd */ 50 /* difference of two spp_seq's can be 51 no bigger than a short */ 52 u_short s_swl1; /* == tcp snd_wl1 */ 53 u_short s_swl2; /* == tcp snd_wl2 */ 54 int s_cwmx; /* max allowable cwnd */ 55 int s_ssthresh; /* s_cwnd size threshhold for 56 * slow start exponential-to- 57 * linear switch */ 58 /* transmit timing stuff 59 * srtt and rttvar are stored as fixed point, for convenience in smoothing. 60 * srtt has 3 bits to the right of the binary point, rttvar has 2. 61 */ 62 short s_idle; /* time idle */ 63 short s_timer[TCPT_NTIMERS]; /* timers */ 64 short s_rxtshift; /* log(2) of rexmt exp. backoff */ 65 short s_rxtcur; /* current retransmit value */ 66 u_short s_rtseq; /* packet being timed */ 67 short s_rtt; /* timer for round trips */ 68 short s_srtt; /* averaged timer */ 69 short s_rttvar; /* variance in round trip time */ 70 char s_force; /* which timer expired */ 71 char s_dupacks; /* counter to intuit xmt loss */ 72 73 /* out of band data */ 74 char s_oobflags; 75 #define SF_SOOB 0x08 /* sending out of band data */ 76 #define SF_IOOB 0x10 /* receiving out of band data */ 77 char s_iobc; /* input characters */ 78 /* debug stuff */ 79 u_short s_want; /* Last candidate for sending */ 80 char s_outx; /* exit taken from spp_output */ 81 char s_inx; /* exit taken from spp_input */ 82 }; 83 84 #define nstosppcb(np) ((struct sppcb *)(np)->nsp_pcb) 85 #define sotosppcb(so) (nstosppcb(sotonspcb(so))) 86 87 struct sppstat { 88 long spps_connattempt; /* connections initiated */ 89 long spps_accepts; /* connections accepted */ 90 long spps_connects; /* connections established */ 91 long spps_drops; /* connections dropped */ 92 long spps_conndrops; /* embryonic connections dropped */ 93 long spps_closed; /* conn. closed (includes drops) */ 94 long spps_segstimed; /* segs where we tried to get rtt */ 95 long spps_rttupdated; /* times we succeeded */ 96 long spps_delack; /* delayed acks sent */ 97 long spps_timeoutdrop; /* conn. dropped in rxmt timeout */ 98 long spps_rexmttimeo; /* retransmit timeouts */ 99 long spps_persisttimeo; /* persist timeouts */ 100 long spps_keeptimeo; /* keepalive timeouts */ 101 long spps_keepprobe; /* keepalive probes sent */ 102 long spps_keepdrops; /* connections dropped in keepalive */ 103 104 long spps_sndtotal; /* total packets sent */ 105 long spps_sndpack; /* data packets sent */ 106 long spps_sndbyte; /* data bytes sent */ 107 long spps_sndrexmitpack; /* data packets retransmitted */ 108 long spps_sndrexmitbyte; /* data bytes retransmitted */ 109 long spps_sndacks; /* ack-only packets sent */ 110 long spps_sndprobe; /* window probes sent */ 111 long spps_sndurg; /* packets sent with URG only */ 112 long spps_sndwinup; /* window update-only packets sent */ 113 long spps_sndctrl; /* control (SYN|FIN|RST) packets sent */ 114 long spps_sndvoid; /* couldn't find requested packet*/ 115 116 long spps_rcvtotal; /* total packets received */ 117 long spps_rcvpack; /* packets received in sequence */ 118 long spps_rcvbyte; /* bytes received in sequence */ 119 long spps_rcvbadsum; /* packets received with ccksum errs */ 120 long spps_rcvbadoff; /* packets received with bad offset */ 121 long spps_rcvshort; /* packets received too short */ 122 long spps_rcvduppack; /* duplicate-only packets received */ 123 long spps_rcvdupbyte; /* duplicate-only bytes received */ 124 long spps_rcvpartduppack; /* packets with some duplicate data */ 125 long spps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */ 126 long spps_rcvoopack; /* out-of-order packets received */ 127 long spps_rcvoobyte; /* out-of-order bytes received */ 128 long spps_rcvpackafterwin; /* packets with data after window */ 129 long spps_rcvbyteafterwin; /* bytes rcvd after window */ 130 long spps_rcvafterclose; /* packets rcvd after "close" */ 131 long spps_rcvwinprobe; /* rcvd window probe packets */ 132 long spps_rcvdupack; /* rcvd duplicate acks */ 133 long spps_rcvacktoomuch; /* rcvd acks for unsent data */ 134 long spps_rcvackpack; /* rcvd ack packets */ 135 long spps_rcvackbyte; /* bytes acked by rcvd acks */ 136 long spps_rcvwinupd; /* rcvd window update packets */ 137 }; 138 struct spp_istat { 139 short hdrops; 140 short badsum; 141 short badlen; 142 short slotim; 143 short fastim; 144 short nonucn; 145 short noconn; 146 short notme; 147 short wrncon; 148 short bdreas; 149 short gonawy; 150 short notyet; 151 short lstdup; 152 struct sppstat newstats; 153 }; 154 155 #ifdef KERNEL 156 struct spp_istat spp_istat; 157 158 /* Following was struct sppstat sppstat; */ 159 #ifndef sppstat 160 #define sppstat spp_istat.newstats 161 #endif 162 163 u_short spp_iss; 164 extern struct sppcb *spp_close(), *spp_disconnect(), 165 *spp_usrclosed(), *spp_timers(), *spp_drop(); 166 #endif 167 168 #define SPP_ISSINCR 128 169 /* 170 * SPP sequence numbers are 16 bit integers operated 171 * on with modular arithmetic. These macros can be 172 * used to compare such integers. 173 */ 174 #ifdef sun 175 short xnsCbug; 176 #define SSEQ_LT(a,b) ((xnsCbug = (short)((a)-(b))) < 0) 177 #define SSEQ_LEQ(a,b) ((xnsCbug = (short)((a)-(b))) <= 0) 178 #define SSEQ_GT(a,b) ((xnsCbug = (short)((a)-(b))) > 0) 179 #define SSEQ_GEQ(a,b) ((xnsCbug = (short)((a)-(b))) >= 0) 180 #else 181 #define SSEQ_LT(a,b) (((short)((a)-(b))) < 0) 182 #define SSEQ_LEQ(a,b) (((short)((a)-(b))) <= 0) 183 #define SSEQ_GT(a,b) (((short)((a)-(b))) > 0) 184 #define SSEQ_GEQ(a,b) (((short)((a)-(b))) >= 0) 185 #endif 186