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inet: reduce silent packet discards

This commit is contained in:
ozaki-r 2020-08-28 06:31:42 +00:00
parent 1595f74976
commit d511e529cc
3 changed files with 30 additions and 8 deletions
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12
sys/netinet/ip_input.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: ip_input.c,v 1.396 2020/08/28 06:30:08 ozaki-r Exp $ */
/* $NetBSD: ip_input.c,v 1.397 2020/08/28 06:31:42 ozaki-r Exp $ */
/*
* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
@ -91,7 +91,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: ip_input.c,v 1.396 2020/08/28 06:30:08 ozaki-r Exp $");
__KERNEL_RCSID(0, "$NetBSD: ip_input.c,v 1.397 2020/08/28 06:31:42 ozaki-r Exp $");
#ifdef _KERNEL_OPT
#include "opt_inet.h"
@ -404,6 +404,7 @@ ipintr(void *arg __unused)
ifp = m_get_rcvif_psref(m, &psref);
if (__predict_false(ifp == NULL)) {
IP_STATINC(IP_STAT_IFDROP);
m_freem(m);
continue;
}
@ -440,8 +441,11 @@ ip_input(struct mbuf *m, struct ifnet *ifp)
* are receiving, can't do anything with incoming packets yet.
* Note: we pre-check without locks held.
*/
if (IN_ADDRLIST_READER_EMPTY())
if (IN_ADDRLIST_READER_EMPTY()) {
IP_STATINC(IP_STAT_IFDROP);
goto out;
}
IP_STATINC(IP_STAT_TOTAL);
/*
@ -1363,6 +1367,7 @@ ip_forward(struct mbuf *m, int srcrt, struct ifnet *rcvif)
}
if (ip->ip_ttl <= IPTTLDEC) {
IP_STATINC(IP_STAT_TIMXCEED);
icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0);
return;
}
@ -1373,6 +1378,7 @@ ip_forward(struct mbuf *m, int srcrt, struct ifnet *rcvif)
rt = rtcache_lookup(ro, &u.dst);
if (rt == NULL) {
rtcache_percpu_putref(ipforward_rt_percpu);
IP_STATINC(IP_STAT_NOROUTE);
icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_NET, dest, 0);
return;
}

17
sys/netinet/ip_output.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: ip_output.c,v 1.317 2020/08/28 06:22:25 ozaki-r Exp $ */
/* $NetBSD: ip_output.c,v 1.318 2020/08/28 06:31:42 ozaki-r Exp $ */
/*
* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
@ -91,7 +91,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: ip_output.c,v 1.317 2020/08/28 06:22:25 ozaki-r Exp $");
__KERNEL_RCSID(0, "$NetBSD: ip_output.c,v 1.318 2020/08/28 06:31:42 ozaki-r Exp $");
#ifdef _KERNEL_OPT
#include "opt_inet.h"
@ -202,6 +202,7 @@ ip_if_output(struct ifnet * const ifp, struct mbuf * const m,
if (rt != NULL) {
error = rt_check_reject_route(rt, ifp);
if (error != 0) {
IP_STATINC(IP_STAT_RTREJECT);
m_freem(m);
return error;
}
@ -312,8 +313,10 @@ ip_output(struct mbuf *m0, struct mbuf *opt, struct route *ro, int flags,
(rt = rtcache_update(ro, 1)) == NULL) {
dst = &udst.sin;
error = rtcache_setdst(ro, &udst.sa);
if (error != 0)
if (error != 0) {
IP_STATINC(IP_STAT_ODROPPED);
goto bad;
}
}
/*
@ -346,6 +349,7 @@ ip_output(struct mbuf *m0, struct mbuf *opt, struct route *ro, int flags,
mtu = ifp->if_mtu;
ia = in_get_ia_from_ifp_psref(ifp, &psref_ia);
if (ia == NULL) {
IP_STATINC(IP_STAT_IFNOADDR);
error = EADDRNOTAVAIL;
goto bad;
}
@ -451,6 +455,7 @@ ip_output(struct mbuf *m0, struct mbuf *opt, struct route *ro, int flags,
xia = in_get_ia_from_ifp_psref(ifp, &_psref);
if (!xia) {
IP_STATINC(IP_STAT_IFNOADDR);
error = EADDRNOTAVAIL;
goto bad;
}
@ -460,6 +465,7 @@ ip_output(struct mbuf *m0, struct mbuf *opt, struct route *ro, int flags,
/* FIXME ifa_getifa is NOMPSAFE */
xia = ifatoia((*xifa->ifa_getifa)(xifa, rdst));
if (xia == NULL) {
IP_STATINC(IP_STAT_IFNOADDR);
error = EADDRNOTAVAIL;
goto bad;
}
@ -511,6 +517,7 @@ ip_output(struct mbuf *m0, struct mbuf *opt, struct route *ro, int flags,
* destination group on the loopback interface.
*/
if (ip->ip_ttl == 0 || (ifp->if_flags & IFF_LOOPBACK) != 0) {
IP_STATINC(IP_STAT_ODROPPED);
m_freem(m);
goto done;
}
@ -554,15 +561,18 @@ ip_output(struct mbuf *m0, struct mbuf *opt, struct route *ro, int flags,
*/
if (isbroadcast) {
if ((ifp->if_flags & IFF_BROADCAST) == 0) {
IP_STATINC(IP_STAT_BCASTDENIED);
error = EADDRNOTAVAIL;
goto bad;
}
if ((flags & IP_ALLOWBROADCAST) == 0) {
IP_STATINC(IP_STAT_BCASTDENIED);
error = EACCES;
goto bad;
}
/* don't allow broadcast messages to be fragmented */
if (ntohs(ip->ip_len) > ifp->if_mtu) {
IP_STATINC(IP_STAT_BCASTDENIED);
error = EMSGSIZE;
goto bad;
}
@ -840,6 +850,7 @@ ip_fragment(struct mbuf *m, struct ifnet *ifp, u_long mtu)
len = (mtu - hlen) &~ 7;
if (len < 8) {
IP_STATINC(IP_STAT_CANTFRAG);
m_freem(m);
return EMSGSIZE;
}

9
sys/netinet/ip_var.h
View File

@ -1,4 +1,4 @@
/* $NetBSD: ip_var.h,v 1.129 2020/08/28 06:19:13 ozaki-r Exp $ */
/* $NetBSD: ip_var.h,v 1.130 2020/08/28 06:31:42 ozaki-r Exp $ */
/*
* Copyright (c) 1982, 1986, 1993
@ -151,8 +151,13 @@ struct ip_pktopts {
#define IP_STAT_PFILDROP_OUT 33 /* dropped by pfil (PFIL_OUT) */
#define IP_STAT_IPSECDROP_IN 34 /* dropped by IPsec SP check */
#define IP_STAT_IPSECDROP_OUT 35 /* dropped by IPsec SP check */
#define IP_STAT_IFDROP 36 /* dropped due to interface state */
#define IP_STAT_TIMXCEED 37 /* time to live exceeded */
#define IP_STAT_IFNOADDR 38 /* interface has no IP address */
#define IP_STAT_RTREJECT 39 /* rejected by route */
#define IP_STAT_BCASTDENIED 40 /* broadcast prohibited */
#define IP_NSTATS 36
#define IP_NSTATS 41
#ifdef _KERNEL