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add icmpreturndatabytes kernel variable (default 8) which specifies the

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number of extra data bytes to return in ICMP error messages.  This is
also available via sysctl as net.icmp.returndatabytes and is limited to
[8,512].
This commit is contained in:
darrenr 2000-06-10 12:39:19 +00:00
parent 90fb69b2b2
commit bae005d1db
2 changed files with 45 additions and 27 deletions
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6
sys/netinet/icmp_var.h
View File

@ -1,4 +1,4 @@
/* $NetBSD: icmp_var.h,v 1.14 2000/02/15 04:03:49 thorpej Exp $ */
/* $NetBSD: icmp_var.h,v 1.15 2000/06/10 12:39:20 darrenr Exp $ */
/*
* Copyright (c) 1982, 1986, 1993
@ -62,12 +62,14 @@ struct icmpstat {
*/
#define ICMPCTL_MASKREPL 1 /* allow replies to netmask requests */
#define ICMPCTL_ERRRATELIMIT 2 /* error rate limit */
#define ICMPCTL_MAXID 3
#define ICMPCTL_RETURNDATABYTES 3 /* # of bytes to include in errors */
#define ICMPCTL_MAXID 4
#define ICMPCTL_NAMES { \
{ 0, 0 }, \
{ "maskrepl", CTLTYPE_INT }, \
{ "errratelimit", CTLTYPE_INT }, \
{ "returndatabytes", CTLTYPE_INT }, \
}
#ifdef _KERNEL

66
sys/netinet/ip_icmp.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: ip_icmp.c,v 1.46 2000/05/22 12:08:43 itojun Exp $ */
/* $NetBSD: ip_icmp.c,v 1.47 2000/06/10 12:39:19 darrenr Exp $ */
/*
* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
@ -146,6 +146,7 @@ int icmpmaskrepl = 0;
#ifdef ICMPPRINTFS
int icmpprintfs = 0;
#endif
int icmpreturndatabytes = 8;
#if 0
static int ip_next_mtu __P((int, int));
@ -217,7 +218,7 @@ icmp_error(n, type, code, dest, destifp)
m = m_gethdr(M_DONTWAIT, MT_HEADER);
if (m == NULL)
goto freeit;
icmplen = oiplen + min(8, oip->ip_len - oiplen);
icmplen = oiplen + min(icmpreturndatabytes, oip->ip_len - oiplen);
m->m_len = icmplen + ICMP_MINLEN;
MH_ALIGN(m, m->m_len);
icp = mtod(m, struct icmp *);
@ -244,7 +245,7 @@ icmp_error(n, type, code, dest, destifp)
HTONS(oip->ip_off);
HTONS(oip->ip_len);
icp->icmp_code = code;
bcopy((caddr_t)oip, (caddr_t)&icp->icmp_ip, icmplen);
m_copydata(n, 0, icmplen, (caddr_t)&icp->icmp_ip);
nip = &icp->icmp_ip;
/*
@ -258,11 +259,16 @@ icmp_error(n, type, code, dest, destifp)
m->m_pkthdr.len = m->m_len;
m->m_pkthdr.rcvif = n->m_pkthdr.rcvif;
nip = mtod(m, struct ip *);
bcopy((caddr_t)oip, (caddr_t)nip, sizeof(struct ip));
nip->ip_len = m->m_len;
/* ip_v set in ip_output */
nip->ip_hl = sizeof(struct ip) >> 2;
nip->ip_p = IPPROTO_ICMP;
nip->ip_tos = 0;
nip->ip_len = m->m_len;
/* ip_id set in ip_output */
nip->ip_off = 0;
/* ip_ttl set in icmp_reflect */
nip->ip_p = IPPROTO_ICMP;
nip->ip_src = oip->ip_src;
nip->ip_dst = oip->ip_dst;
icmp_reflect(m);
freeit:
@ -795,40 +801,50 @@ icmp_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
void *newp;
size_t newlen;
{
int arg, error, s;
/* All sysctl names at this level are terminal. */
if (namelen != 1)
return (ENOTDIR);
switch (name[0]) {
switch (name[0])
{
case ICMPCTL_MASKREPL:
return (sysctl_int(oldp, oldlenp, newp, newlen, &icmpmaskrepl));
error = sysctl_int(oldp, oldlenp, newp, newlen, &icmpmaskrepl);
break;
case ICMPCTL_ERRRATELIMIT:
{
int rate_usec, error, s;
/*
* The sysctl specifies the rate in usec-between-icmp,
* so we must convert from/to a timeval.
*/
rate_usec = (icmperrratelim.tv_sec * 1000000) +
arg = (icmperrratelim.tv_sec * 1000000) +
icmperrratelim.tv_usec;
error = sysctl_int(oldp, oldlenp, newp, newlen, &rate_usec);
error = sysctl_int(oldp, oldlenp, newp, newlen, &arg);
if (error)
return (error);
if (rate_usec < 0)
return (EINVAL);
s = splsoftnet();
icmperrratelim.tv_sec = rate_usec / 1000000;
icmperrratelim.tv_usec = rate_usec % 1000000;
splx(s);
return (0);
}
break;
if (arg >= 0) {
s = splsoftnet();
icmperrratelim.tv_sec = arg / 1000000;
icmperrratelim.tv_usec = arg % 1000000;
splx(s);
} else
error = EINVAL;
break;
case ICMPCTL_RETURNDATABYTES:
arg = icmpreturndatabytes;
error = sysctl_int(oldp, oldlenp, newp, newlen, &arg);
if (error)
break;
if ((arg >= 8) || (arg <= 512))
icmpreturndatabytes = arg;
else
error = EINVAL;
break;
default:
return (ENOPROTOOPT);
error = ENOPROTOOPT;
break;
}
/* NOTREACHED */
return error;
}
static void