1 /* 2 * Copyright (c) 2001-2003 3 * Fraunhofer Institute for Open Communication Systems (FhG Fokus). 4 * All rights reserved. 5 * 6 * Author: Harti Brandt <harti@freebsd.org> 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * $Begemot: bsnmp/snmp_mibII/mibII_tcp.c,v 1.7 2005/05/23 09:03:42 brandt_h Exp $ 30 * 31 * tcp 32 */ 33 #include "mibII.h" 34 #include "mibII_oid.h" 35 #include <sys/socketvar.h> 36 #include <netinet/in_pcb.h> 37 #include <netinet/tcp.h> 38 #include <netinet/tcp_var.h> 39 #include <netinet/tcp_timer.h> 40 #include <netinet/tcp_fsm.h> 41 42 struct tcp_index { 43 struct asn_oid index; 44 struct xtcpcb *tp; 45 }; 46 47 static uint64_t tcp_tick; 48 static struct tcpstat tcpstat; 49 static struct xinpgen *xinpgen; 50 static size_t xinpgen_len; 51 static u_int tcp_count; 52 static u_int tcp_total; 53 54 static u_int oidnum; 55 static struct tcp_index *tcpoids; 56 57 static int 58 tcp_compare(const void *p1, const void *p2) 59 { 60 const struct tcp_index *t1 = p1; 61 const struct tcp_index *t2 = p2; 62 63 return (asn_compare_oid(&t1->index, &t2->index)); 64 } 65 66 static int 67 fetch_tcp(void) 68 { 69 size_t len; 70 struct xinpgen *ptr; 71 struct xtcpcb *tp; 72 struct tcp_index *oid; 73 in_addr_t inaddr; 74 75 len = sizeof(tcpstat); 76 if (sysctlbyname("net.inet.tcp.stats", &tcpstat, &len, NULL, 0) == -1) { 77 syslog(LOG_ERR, "net.inet.tcp.stats: %m"); 78 return (-1); 79 } 80 if (len != sizeof(tcpstat)) { 81 syslog(LOG_ERR, "net.inet.tcp.stats: wrong size"); 82 return (-1); 83 } 84 85 len = 0; 86 if (sysctlbyname("net.inet.tcp.pcblist", NULL, &len, NULL, 0) == -1) { 87 syslog(LOG_ERR, "net.inet.tcp.pcblist: %m"); 88 return (-1); 89 } 90 if (len > xinpgen_len) { 91 if ((ptr = realloc(xinpgen, len)) == NULL) { 92 syslog(LOG_ERR, "%zu: %m", len); 93 return (-1); 94 } 95 xinpgen = ptr; 96 xinpgen_len = len; 97 } 98 if (sysctlbyname("net.inet.tcp.pcblist", xinpgen, &len, NULL, 0) == -1) { 99 syslog(LOG_ERR, "net.inet.tcp.pcblist: %m"); 100 return (-1); 101 } 102 103 tcp_tick = get_ticks(); 104 105 tcp_count = 0; 106 tcp_total = 0; 107 for (ptr = (struct xinpgen *)(void *)((char *)xinpgen + xinpgen->xig_len); 108 ptr->xig_len > sizeof(struct xinpgen); 109 ptr = (struct xinpgen *)(void *)((char *)ptr + ptr->xig_len)) { 110 tp = (struct xtcpcb *)ptr; 111 if (tp->xt_inp.inp_gencnt > xinpgen->xig_gen || 112 (tp->xt_inp.inp_vflag & INP_IPV4) == 0) 113 continue; 114 115 tcp_total++; 116 if (tp->xt_tp.t_state == TCPS_ESTABLISHED || 117 tp->xt_tp.t_state == TCPS_CLOSE_WAIT) 118 tcp_count++; 119 } 120 121 if (oidnum < tcp_total) { 122 oid = realloc(tcpoids, tcp_total * sizeof(tcpoids[0])); 123 if (oid == NULL) { 124 free(tcpoids); 125 oidnum = 0; 126 return (0); 127 } 128 tcpoids = oid; 129 oidnum = tcp_total; 130 } 131 132 oid = tcpoids; 133 for (ptr = (struct xinpgen *)(void *)((char *)xinpgen + xinpgen->xig_len); 134 ptr->xig_len > sizeof(struct xinpgen); 135 ptr = (struct xinpgen *)(void *)((char *)ptr + ptr->xig_len)) { 136 tp = (struct xtcpcb *)ptr; 137 if (tp->xt_inp.inp_gencnt > xinpgen->xig_gen || 138 (tp->xt_inp.inp_vflag & INP_IPV4) == 0) 139 continue; 140 oid->tp = tp; 141 oid->index.len = 10; 142 inaddr = ntohl(tp->xt_inp.inp_laddr.s_addr); 143 oid->index.subs[0] = (inaddr >> 24) & 0xff; 144 oid->index.subs[1] = (inaddr >> 16) & 0xff; 145 oid->index.subs[2] = (inaddr >> 8) & 0xff; 146 oid->index.subs[3] = (inaddr >> 0) & 0xff; 147 oid->index.subs[4] = ntohs(tp->xt_inp.inp_lport); 148 inaddr = ntohl(tp->xt_inp.inp_faddr.s_addr); 149 oid->index.subs[5] = (inaddr >> 24) & 0xff; 150 oid->index.subs[6] = (inaddr >> 16) & 0xff; 151 oid->index.subs[7] = (inaddr >> 8) & 0xff; 152 oid->index.subs[8] = (inaddr >> 0) & 0xff; 153 oid->index.subs[9] = ntohs(tp->xt_inp.inp_fport); 154 oid++; 155 } 156 157 qsort(tcpoids, tcp_total, sizeof(tcpoids[0]), tcp_compare); 158 159 return (0); 160 } 161 162 /* 163 * Scalars 164 */ 165 int 166 op_tcp(struct snmp_context *ctx __unused, struct snmp_value *value, 167 u_int sub, u_int iidx __unused, enum snmp_op op) 168 { 169 switch (op) { 170 171 case SNMP_OP_GETNEXT: 172 abort(); 173 174 case SNMP_OP_GET: 175 break; 176 177 case SNMP_OP_SET: 178 return (SNMP_ERR_NOT_WRITEABLE); 179 180 case SNMP_OP_ROLLBACK: 181 case SNMP_OP_COMMIT: 182 abort(); 183 } 184 185 if (tcp_tick < this_tick) 186 if (fetch_tcp() == -1) 187 return (SNMP_ERR_GENERR); 188 189 switch (value->var.subs[sub - 1]) { 190 191 case LEAF_tcpRtoAlgorithm: 192 value->v.integer = 4; /* Van Jacobson */ 193 break; 194 195 #define hz clockinfo.hz 196 197 case LEAF_tcpRtoMin: 198 value->v.integer = 1000 * TCPTV_MIN / hz; 199 break; 200 201 case LEAF_tcpRtoMax: 202 value->v.integer = 1000 * TCPTV_REXMTMAX / hz; 203 break; 204 #undef hz 205 206 case LEAF_tcpMaxConn: 207 value->v.integer = -1; 208 break; 209 210 case LEAF_tcpActiveOpens: 211 value->v.uint32 = tcpstat.tcps_connattempt; 212 break; 213 214 case LEAF_tcpPassiveOpens: 215 value->v.uint32 = tcpstat.tcps_accepts; 216 break; 217 218 case LEAF_tcpAttemptFails: 219 value->v.uint32 = tcpstat.tcps_conndrops; 220 break; 221 222 case LEAF_tcpEstabResets: 223 value->v.uint32 = tcpstat.tcps_drops; 224 break; 225 226 case LEAF_tcpCurrEstab: 227 value->v.uint32 = tcp_count; 228 break; 229 230 case LEAF_tcpInSegs: 231 value->v.uint32 = tcpstat.tcps_rcvtotal; 232 break; 233 234 case LEAF_tcpOutSegs: 235 value->v.uint32 = tcpstat.tcps_sndtotal - 236 tcpstat.tcps_sndrexmitpack; 237 break; 238 239 case LEAF_tcpRetransSegs: 240 value->v.uint32 = tcpstat.tcps_sndrexmitpack; 241 break; 242 243 case LEAF_tcpInErrs: 244 value->v.uint32 = tcpstat.tcps_rcvbadsum + 245 tcpstat.tcps_rcvbadoff + 246 tcpstat.tcps_rcvshort; 247 break; 248 } 249 return (SNMP_ERR_NOERROR); 250 } 251 252 int 253 op_tcpconn(struct snmp_context *ctx __unused, struct snmp_value *value, 254 u_int sub, u_int iidx __unused, enum snmp_op op) 255 { 256 u_int i; 257 258 if (tcp_tick < this_tick) 259 if (fetch_tcp() == -1) 260 return (SNMP_ERR_GENERR); 261 262 switch (op) { 263 264 case SNMP_OP_GETNEXT: 265 for (i = 0; i < tcp_total; i++) 266 if (index_compare(&value->var, sub, &tcpoids[i].index) < 0) 267 break; 268 if (i == tcp_total) 269 return (SNMP_ERR_NOSUCHNAME); 270 index_append(&value->var, sub, &tcpoids[i].index); 271 break; 272 273 case SNMP_OP_GET: 274 for (i = 0; i < tcp_total; i++) 275 if (index_compare(&value->var, sub, &tcpoids[i].index) == 0) 276 break; 277 if (i == tcp_total) 278 return (SNMP_ERR_NOSUCHNAME); 279 break; 280 281 case SNMP_OP_SET: 282 return (SNMP_ERR_NOT_WRITEABLE); 283 284 case SNMP_OP_ROLLBACK: 285 case SNMP_OP_COMMIT: 286 default: 287 abort(); 288 } 289 290 switch (value->var.subs[sub - 1]) { 291 292 case LEAF_tcpConnState: 293 switch (tcpoids[i].tp->xt_tp.t_state) { 294 295 case TCPS_CLOSED: 296 value->v.integer = 1; 297 break; 298 case TCPS_LISTEN: 299 value->v.integer = 2; 300 break; 301 case TCPS_SYN_SENT: 302 value->v.integer = 3; 303 break; 304 case TCPS_SYN_RECEIVED: 305 value->v.integer = 4; 306 break; 307 case TCPS_ESTABLISHED: 308 value->v.integer = 5; 309 break; 310 case TCPS_CLOSE_WAIT: 311 value->v.integer = 8; 312 break; 313 case TCPS_FIN_WAIT_1: 314 value->v.integer = 6; 315 break; 316 case TCPS_CLOSING: 317 value->v.integer = 10; 318 break; 319 case TCPS_LAST_ACK: 320 value->v.integer = 9; 321 break; 322 case TCPS_FIN_WAIT_2: 323 value->v.integer = 7; 324 break; 325 case TCPS_TIME_WAIT: 326 value->v.integer = 11; 327 break; 328 default: 329 value->v.integer = 0; 330 break; 331 } 332 break; 333 334 case LEAF_tcpConnLocalAddress: 335 value->v.ipaddress[0] = tcpoids[i].index.subs[0]; 336 value->v.ipaddress[1] = tcpoids[i].index.subs[1]; 337 value->v.ipaddress[2] = tcpoids[i].index.subs[2]; 338 value->v.ipaddress[3] = tcpoids[i].index.subs[3]; 339 break; 340 341 case LEAF_tcpConnLocalPort: 342 value->v.integer = tcpoids[i].index.subs[4]; 343 break; 344 345 case LEAF_tcpConnRemAddress: 346 value->v.ipaddress[0] = tcpoids[i].index.subs[5]; 347 value->v.ipaddress[1] = tcpoids[i].index.subs[6]; 348 value->v.ipaddress[2] = tcpoids[i].index.subs[7]; 349 value->v.ipaddress[3] = tcpoids[i].index.subs[8]; 350 break; 351 352 case LEAF_tcpConnRemPort: 353 value->v.integer = tcpoids[i].index.subs[9]; 354 break; 355 } 356 return (SNMP_ERR_NOERROR); 357 } 358