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freebsd-src/contrib/bsnmp/snmp_mibII/mibII_tcp.c
Gleb Smirnoff cc65eb4e79 Hide struct inpcb, struct tcpcb from the userland. 
This is a painful change, but it is needed.  On the one hand, we avoid
modifying them, and this slows down some ideas, on the other hand we still
eventually modify them and tools like netstat(1) never work on next version of
FreeBSD.  We maintain a ton of spares in them, and we already got some ifdef
hell at the end of tcpcb.

Details:
- Hide struct inpcb, struct tcpcb under _KERNEL || _WANT_FOO.
- Make struct xinpcb, struct xtcpcb pure API structures, not including
  kernel structures inpcb and tcpcb inside.  Export into these structures
  the fields from inpcb and tcpcb that are known to be used, and put there
  a ton of spare space.
- Make kernel and userland utilities compilable after these changes.
- Bump __FreeBSD_version.

Reviewed by:	rrs, gnn
Differential Revision:	D10018
2017-03-21 06:39:49 +00:00

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/*
* Copyright (c) 2001-2003
* Fraunhofer Institute for Open Communication Systems (FhG Fokus).
* All rights reserved.
*
* Author: Harti Brandt <harti@freebsd.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Begemot: bsnmp/snmp_mibII/mibII_tcp.c,v 1.7 2005/05/23 09:03:42 brandt_h Exp $
*
* tcp
*/
#include "mibII.h"
#include "mibII_oid.h"
#include <sys/socketvar.h>
#include <netinet/in_pcb.h>
#include <netinet/tcp.h>
#include <netinet/tcp_var.h>
#include <netinet/tcp_timer.h>
#include <netinet/tcp_fsm.h>
struct tcp_index {
struct asn_oid index;
struct xtcpcb *tp;
};
static uint64_t tcp_tick;
static uint64_t tcp_stats_tick;
static struct tcpstat tcpstat;
static uint64_t tcps_states[TCP_NSTATES];
static struct xinpgen *xinpgen;
static size_t xinpgen_len;
static u_int tcp_total;
static u_int oidnum;
static struct tcp_index *tcpoids;
static int
tcp_compare(const void *p1, const void *p2)
{
const struct tcp_index *t1 = p1;
const struct tcp_index *t2 = p2;
return (asn_compare_oid(&t1->index, &t2->index));
}
static int
fetch_tcp_stats(void)
{
size_t len;
len = sizeof(tcpstat);
if (sysctlbyname("net.inet.tcp.stats", &tcpstat, &len, NULL, 0) == -1) {
syslog(LOG_ERR, "net.inet.tcp.stats: %m");
return (-1);
}
if (len != sizeof(tcpstat)) {
syslog(LOG_ERR, "net.inet.tcp.stats: wrong size");
return (-1);
}
len = sizeof(tcps_states);
if (sysctlbyname("net.inet.tcp.states", &tcps_states, &len, NULL,
0) == -1) {
syslog(LOG_ERR, "net.inet.tcp.states: %m");
return (-1);
}
if (len != sizeof(tcps_states)) {
syslog(LOG_ERR, "net.inet.tcp.states: wrong size");
return (-1);
}
tcp_stats_tick = get_ticks();
return (0);
}
static int
fetch_tcp(void)
{
size_t len;
struct xinpgen *ptr;
struct xtcpcb *tp;
struct tcp_index *oid;
in_addr_t inaddr;
len = 0;
if (sysctlbyname("net.inet.tcp.pcblist", NULL, &len, NULL, 0) == -1) {
syslog(LOG_ERR, "net.inet.tcp.pcblist: %m");
return (-1);
}
if (len > xinpgen_len) {
if ((ptr = realloc(xinpgen, len)) == NULL) {
syslog(LOG_ERR, "%zu: %m", len);
return (-1);
}
xinpgen = ptr;
xinpgen_len = len;
}
if (sysctlbyname("net.inet.tcp.pcblist", xinpgen, &len, NULL, 0) == -1) {
syslog(LOG_ERR, "net.inet.tcp.pcblist: %m");
return (-1);
}
tcp_tick = get_ticks();
tcp_total = 0;
for (ptr = (struct xinpgen *)(void *)((char *)xinpgen + xinpgen->xig_len);
ptr->xig_len > sizeof(struct xinpgen);
ptr = (struct xinpgen *)(void *)((char *)ptr + ptr->xig_len)) {
tp = (struct xtcpcb *)ptr;
if (tp->xt_inp.inp_gencnt > xinpgen->xig_gen ||
(tp->xt_inp.inp_vflag & (INP_IPV4|INP_IPV6)) == 0)
continue;
if (tp->xt_inp.inp_vflag & INP_IPV4)
tcp_total++;
}
if (oidnum < tcp_total) {
oid = realloc(tcpoids, tcp_total * sizeof(tcpoids[0]));
if (oid == NULL) {
free(tcpoids);
oidnum = 0;
return (0);
}
tcpoids = oid;
oidnum = tcp_total;
}
oid = tcpoids;
for (ptr = (struct xinpgen *)(void *)((char *)xinpgen + xinpgen->xig_len);
ptr->xig_len > sizeof(struct xinpgen);
ptr = (struct xinpgen *)(void *)((char *)ptr + ptr->xig_len)) {
tp = (struct xtcpcb *)ptr;
if (tp->xt_inp.inp_gencnt > xinpgen->xig_gen ||
(tp->xt_inp.inp_vflag & INP_IPV4) == 0)
continue;
oid->tp = tp;
oid->index.len = 10;
inaddr = ntohl(tp->xt_inp.inp_laddr.s_addr);
oid->index.subs[0] = (inaddr >> 24) & 0xff;
oid->index.subs[1] = (inaddr >> 16) & 0xff;
oid->index.subs[2] = (inaddr >> 8) & 0xff;
oid->index.subs[3] = (inaddr >> 0) & 0xff;
oid->index.subs[4] = ntohs(tp->xt_inp.inp_lport);
inaddr = ntohl(tp->xt_inp.inp_faddr.s_addr);
oid->index.subs[5] = (inaddr >> 24) & 0xff;
oid->index.subs[6] = (inaddr >> 16) & 0xff;
oid->index.subs[7] = (inaddr >> 8) & 0xff;
oid->index.subs[8] = (inaddr >> 0) & 0xff;
oid->index.subs[9] = ntohs(tp->xt_inp.inp_fport);
oid++;
}
qsort(tcpoids, tcp_total, sizeof(tcpoids[0]), tcp_compare);
return (0);
}
/*
* Scalars
*/
int
op_tcp(struct snmp_context *ctx __unused, struct snmp_value *value,
u_int sub, u_int iidx __unused, enum snmp_op op)
{
switch (op) {
case SNMP_OP_GETNEXT:
abort();
case SNMP_OP_GET:
break;
case SNMP_OP_SET:
return (SNMP_ERR_NOT_WRITEABLE);
case SNMP_OP_ROLLBACK:
case SNMP_OP_COMMIT:
abort();
}
if (tcp_stats_tick < this_tick)
if (fetch_tcp_stats() == -1)
return (SNMP_ERR_GENERR);
switch (value->var.subs[sub - 1]) {
case LEAF_tcpRtoAlgorithm:
value->v.integer = 4; /* Van Jacobson */
break;
#define hz clockinfo.hz
case LEAF_tcpRtoMin:
value->v.integer = 1000 * TCPTV_MIN / hz;
break;
case LEAF_tcpRtoMax:
value->v.integer = 1000 * TCPTV_REXMTMAX / hz;
break;
#undef hz
case LEAF_tcpMaxConn:
value->v.integer = -1;
break;
case LEAF_tcpActiveOpens:
value->v.uint32 = tcpstat.tcps_connattempt;
break;
case LEAF_tcpPassiveOpens:
value->v.uint32 = tcpstat.tcps_accepts;
break;
case LEAF_tcpAttemptFails:
value->v.uint32 = tcpstat.tcps_conndrops;
break;
case LEAF_tcpEstabResets:
value->v.uint32 = tcpstat.tcps_drops;
break;
case LEAF_tcpCurrEstab:
value->v.uint32 = tcps_states[TCPS_ESTABLISHED] +
tcps_states[TCPS_CLOSE_WAIT];
break;
case LEAF_tcpInSegs:
value->v.uint32 = tcpstat.tcps_rcvtotal;
break;
case LEAF_tcpOutSegs:
value->v.uint32 = tcpstat.tcps_sndtotal -
tcpstat.tcps_sndrexmitpack;
break;
case LEAF_tcpRetransSegs:
value->v.uint32 = tcpstat.tcps_sndrexmitpack;
break;
case LEAF_tcpInErrs:
value->v.uint32 = tcpstat.tcps_rcvbadsum +
tcpstat.tcps_rcvbadoff +
tcpstat.tcps_rcvshort;
break;
}
return (SNMP_ERR_NOERROR);
}
int
op_tcpconn(struct snmp_context *ctx __unused, struct snmp_value *value,
u_int sub, u_int iidx __unused, enum snmp_op op)
{
u_int i;
if (tcp_tick < this_tick)
if (fetch_tcp() == -1)
return (SNMP_ERR_GENERR);
switch (op) {
case SNMP_OP_GETNEXT:
for (i = 0; i < tcp_total; i++)
if (index_compare(&value->var, sub, &tcpoids[i].index) < 0)
break;
if (i == tcp_total)
return (SNMP_ERR_NOSUCHNAME);
index_append(&value->var, sub, &tcpoids[i].index);
break;
case SNMP_OP_GET:
for (i = 0; i < tcp_total; i++)
if (index_compare(&value->var, sub, &tcpoids[i].index) == 0)
break;
if (i == tcp_total)
return (SNMP_ERR_NOSUCHNAME);
break;
case SNMP_OP_SET:
return (SNMP_ERR_NOT_WRITEABLE);
case SNMP_OP_ROLLBACK:
case SNMP_OP_COMMIT:
default:
abort();
}
switch (value->var.subs[sub - 1]) {
case LEAF_tcpConnState:
switch (tcpoids[i].tp->t_state) {
case TCPS_CLOSED:
value->v.integer = 1;
break;
case TCPS_LISTEN:
value->v.integer = 2;
break;
case TCPS_SYN_SENT:
value->v.integer = 3;
break;
case TCPS_SYN_RECEIVED:
value->v.integer = 4;
break;
case TCPS_ESTABLISHED:
value->v.integer = 5;
break;
case TCPS_CLOSE_WAIT:
value->v.integer = 8;
break;
case TCPS_FIN_WAIT_1:
value->v.integer = 6;
break;
case TCPS_CLOSING:
value->v.integer = 10;
break;
case TCPS_LAST_ACK:
value->v.integer = 9;
break;
case TCPS_FIN_WAIT_2:
value->v.integer = 7;
break;
case TCPS_TIME_WAIT:
value->v.integer = 11;
break;
default:
value->v.integer = 0;
break;
}
break;
case LEAF_tcpConnLocalAddress:
value->v.ipaddress[0] = tcpoids[i].index.subs[0];
value->v.ipaddress[1] = tcpoids[i].index.subs[1];
value->v.ipaddress[2] = tcpoids[i].index.subs[2];
value->v.ipaddress[3] = tcpoids[i].index.subs[3];
break;
case LEAF_tcpConnLocalPort:
value->v.integer = tcpoids[i].index.subs[4];
break;
case LEAF_tcpConnRemAddress:
value->v.ipaddress[0] = tcpoids[i].index.subs[5];
value->v.ipaddress[1] = tcpoids[i].index.subs[6];
value->v.ipaddress[2] = tcpoids[i].index.subs[7];
value->v.ipaddress[3] = tcpoids[i].index.subs[8];
break;
case LEAF_tcpConnRemPort:
value->v.integer = tcpoids[i].index.subs[9];
break;
}
return (SNMP_ERR_NOERROR);
}
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