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Tidy up tcp_log_in_vain and blackhole.

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This commit is contained in:
Andre Oppermann 2007-03-21 18:36:49 +00:00
parent 85c497918c
commit 574b696407
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=167775
2 changed files with 62 additions and 88 deletions
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75
sys/netinet/tcp_input.c
View File

@ -106,11 +106,11 @@ SYSCTL_STRUCT(_net_inet_tcp, TCPCTL_STATS, stats, CTLFLAG_RW,
static int tcp_log_in_vain = 0;
SYSCTL_INT(_net_inet_tcp, OID_AUTO, log_in_vain, CTLFLAG_RW,
&tcp_log_in_vain, 0, "Log all incoming TCP connections");
&tcp_log_in_vain, 0, "Log all incoming TCP segments to closed ports");
static int blackhole = 0;
SYSCTL_INT(_net_inet_tcp, OID_AUTO, blackhole, CTLFLAG_RW,
&blackhole, 0, "Do not send RST when dropping refused connections");
&blackhole, 0, "Do not send RST on segments to closed ports");
int tcp_delack_enabled = 1;
SYSCTL_INT(_net_inet_tcp, OID_AUTO, delayed_ack, CTLFLAG_RW,
@ -704,62 +704,49 @@ tcp_input(m, off0)
#endif /*IPSEC || FAST_IPSEC*/
/*
* If the state is CLOSED (i.e., TCB does not exist) then
* all data in the incoming segment is discarded.
* If the TCB exists but is in CLOSED state, it is embryonic,
* but should either do a listen or a connect soon.
* If the INPCB does not exist then all data in the incoming
* segment is discarded and an appropriate RST is sent back.
*/
if (inp == NULL) {
if (tcp_log_in_vain) {
#ifdef INET6
char dbuf[INET6_ADDRSTRLEN+2], sbuf[INET6_ADDRSTRLEN+2];
#else
/*
* Log communication attempts to ports that are not
* in use.
*/
if ((tcp_log_in_vain == 1 && (thflags & TH_SYN)) ||
tcp_log_in_vain == 2) {
#ifndef INET6
char dbuf[4*sizeof "123"], sbuf[4*sizeof "123"];
#endif
#else
char dbuf[INET6_ADDRSTRLEN+2], sbuf[INET6_ADDRSTRLEN+2];
if (isipv6) {
#ifdef INET6
strcpy(dbuf, "[");
strcpy(sbuf, "[");
strcat(dbuf,
ip6_sprintf(ip6buf, &ip6->ip6_dst));
strcat(dbuf, "]");
strcpy(sbuf, "[");
strcat(sbuf,
ip6_sprintf(ip6buf, &ip6->ip6_src));
strcat(dbuf, "]");
strcat(sbuf, "]");
#endif
} else {
} else
#endif /* INET6 */
{
strcpy(dbuf, inet_ntoa(ip->ip_dst));
strcpy(sbuf, inet_ntoa(ip->ip_src));
}
switch (tcp_log_in_vain) {
case 1:
if ((thflags & TH_SYN) == 0)
break;
/* FALLTHROUGH */
case 2:
log(LOG_INFO,
"Connection attempt to TCP %s:%d "
"from %s:%d flags:0x%02x\n",
dbuf, ntohs(th->th_dport), sbuf,
ntohs(th->th_sport), thflags);
break;
default:
break;
}
}
if (blackhole) {
switch (blackhole) {
case 1:
if (thflags & TH_SYN)
goto drop;
break;
case 2:
goto drop;
default:
goto drop;
}
log(LOG_INFO,
"Connection attempt to TCP %s:%d "
"from %s:%d flags:0x%02x\n",
dbuf, ntohs(th->th_dport), sbuf,
ntohs(th->th_sport), thflags);
}
/*
* When blackholing do not respond with a RST but
* completely ignore the segment and drop it.
*/
if ((blackhole == 1 && (thflags & TH_SYN)) ||
blackhole == 2)
goto drop;
rstreason = BANDLIM_RST_CLOSEDPORT;
goto dropwithreset;
}

75
sys/netinet/tcp_reass.c
View File

@ -106,11 +106,11 @@ SYSCTL_STRUCT(_net_inet_tcp, TCPCTL_STATS, stats, CTLFLAG_RW,
static int tcp_log_in_vain = 0;
SYSCTL_INT(_net_inet_tcp, OID_AUTO, log_in_vain, CTLFLAG_RW,
&tcp_log_in_vain, 0, "Log all incoming TCP connections");
&tcp_log_in_vain, 0, "Log all incoming TCP segments to closed ports");
static int blackhole = 0;
SYSCTL_INT(_net_inet_tcp, OID_AUTO, blackhole, CTLFLAG_RW,
&blackhole, 0, "Do not send RST when dropping refused connections");
&blackhole, 0, "Do not send RST on segments to closed ports");
int tcp_delack_enabled = 1;
SYSCTL_INT(_net_inet_tcp, OID_AUTO, delayed_ack, CTLFLAG_RW,
@ -704,62 +704,49 @@ tcp_input(m, off0)
#endif /*IPSEC || FAST_IPSEC*/
/*
* If the state is CLOSED (i.e., TCB does not exist) then
* all data in the incoming segment is discarded.
* If the TCB exists but is in CLOSED state, it is embryonic,
* but should either do a listen or a connect soon.
* If the INPCB does not exist then all data in the incoming
* segment is discarded and an appropriate RST is sent back.
*/
if (inp == NULL) {
if (tcp_log_in_vain) {
#ifdef INET6
char dbuf[INET6_ADDRSTRLEN+2], sbuf[INET6_ADDRSTRLEN+2];
#else
/*
* Log communication attempts to ports that are not
* in use.
*/
if ((tcp_log_in_vain == 1 && (thflags & TH_SYN)) ||
tcp_log_in_vain == 2) {
#ifndef INET6
char dbuf[4*sizeof "123"], sbuf[4*sizeof "123"];
#endif
#else
char dbuf[INET6_ADDRSTRLEN+2], sbuf[INET6_ADDRSTRLEN+2];
if (isipv6) {
#ifdef INET6
strcpy(dbuf, "[");
strcpy(sbuf, "[");
strcat(dbuf,
ip6_sprintf(ip6buf, &ip6->ip6_dst));
strcat(dbuf, "]");
strcpy(sbuf, "[");
strcat(sbuf,
ip6_sprintf(ip6buf, &ip6->ip6_src));
strcat(dbuf, "]");
strcat(sbuf, "]");
#endif
} else {
} else
#endif /* INET6 */
{
strcpy(dbuf, inet_ntoa(ip->ip_dst));
strcpy(sbuf, inet_ntoa(ip->ip_src));
}
switch (tcp_log_in_vain) {
case 1:
if ((thflags & TH_SYN) == 0)
break;
/* FALLTHROUGH */
case 2:
log(LOG_INFO,
"Connection attempt to TCP %s:%d "
"from %s:%d flags:0x%02x\n",
dbuf, ntohs(th->th_dport), sbuf,
ntohs(th->th_sport), thflags);
break;
default:
break;
}
}
if (blackhole) {
switch (blackhole) {
case 1:
if (thflags & TH_SYN)
goto drop;
break;
case 2:
goto drop;
default:
goto drop;
}
log(LOG_INFO,
"Connection attempt to TCP %s:%d "
"from %s:%d flags:0x%02x\n",
dbuf, ntohs(th->th_dport), sbuf,
ntohs(th->th_sport), thflags);
}
/*
* When blackholing do not respond with a RST but
* completely ignore the segment and drop it.
*/
if ((blackhole == 1 && (thflags & TH_SYN)) ||
blackhole == 2)
goto drop;
rstreason = BANDLIM_RST_CLOSEDPORT;
goto dropwithreset;
}