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[src/trunk]: src/sys/netinet6 inet6: remove unused dad ns/na counters
details: https://anonhg.NetBSD.org/src/rev/a62541ec3411
branches: trunk
changeset: 446413:a62541ec3411
user: roy <roy%NetBSD.org@localhost>
date: Tue Dec 04 12:23:43 2018 +0000
description:
inet6: remove unused dad ns/na counters
The current DaD code triggers when either an NS or NA is directly
received, so the counters themselves do nothing of use.
diffstat:
sys/netinet6/nd6_nbr.c | 123 +++++++++++++-----------------------------------
1 files changed, 35 insertions(+), 88 deletions(-)
diffs (260 lines):
diff -r bd14ed145a43 -r a62541ec3411 sys/netinet6/nd6_nbr.c
--- a/sys/netinet6/nd6_nbr.c Tue Dec 04 10:10:15 2018 +0000
+++ b/sys/netinet6/nd6_nbr.c Tue Dec 04 12:23:43 2018 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: nd6_nbr.c,v 1.157 2018/11/29 09:51:21 ozaki-r Exp $ */
+/* $NetBSD: nd6_nbr.c,v 1.158 2018/12/04 12:23:43 roy Exp $ */
/* $KAME: nd6_nbr.c,v 1.61 2001/02/10 16:06:14 jinmei Exp $ */
/*
@@ -31,7 +31,7 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: nd6_nbr.c,v 1.157 2018/11/29 09:51:21 ozaki-r Exp $");
+__KERNEL_RCSID(0, "$NetBSD: nd6_nbr.c,v 1.158 2018/12/04 12:23:43 roy Exp $");
#ifdef _KERNEL_OPT
#include "opt_inet.h"
@@ -76,14 +76,14 @@
#endif
struct dadq;
-static struct dadq *nd6_dad_find(struct ifaddr *, struct nd_opt_nonce *);
+static struct dadq *nd6_dad_find(struct ifaddr *, struct nd_opt_nonce *, bool *);
static void nd6_dad_starttimer(struct dadq *, int);
static void nd6_dad_destroytimer(struct dadq *);
static void nd6_dad_timer(struct dadq *);
static void nd6_dad_ns_output(struct dadq *, struct ifaddr *);
static void nd6_dad_ns_input(struct ifaddr *, struct nd_opt_nonce *);
static void nd6_dad_na_input(struct ifaddr *);
-static void nd6_dad_duplicated(struct dadq *);
+static void nd6_dad_duplicated(struct ifaddr *, struct dadq *);
static int dad_maxtry = 15; /* max # of *tries* to transmit DAD packet */
@@ -661,8 +661,9 @@
*
* Otherwise, process as defined in RFC 2461.
*/
- if (ifa
- && (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE)) {
+ if (ifa &&
+ (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE))
+ {
nd6_dad_na_input(ifa);
ifa_release(ifa, &psref_ia);
ifa = NULL;
@@ -1075,8 +1076,6 @@
int dad_count; /* max NS to send */
int dad_ns_tcount; /* # of trials to send NS */
int dad_ns_ocount; /* NS sent so far */
- int dad_ns_icount;
- int dad_na_icount;
int dad_ns_lcount; /* looped back NS */
struct callout dad_timer_ch;
#define ND_OPT_NONCE_STORE 3 /* dad_count should not exceed this */
@@ -1097,7 +1096,7 @@
static kmutex_t nd6_dad_lock;
static struct dadq *
-nd6_dad_find(struct ifaddr *ifa, struct nd_opt_nonce *nonce)
+nd6_dad_find(struct ifaddr *ifa, struct nd_opt_nonce *nonce, bool *found_nonce)
{
struct dadq *dp;
int i, nonce_max;
@@ -1122,6 +1121,7 @@
if (i < nonce_max) {
char ip6buf[INET6_ADDRSTRLEN];
+ *found_nonce = true;
log(LOG_DEBUG,
"%s: detected a looped back NS message for %s\n",
ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???",
@@ -1210,7 +1210,7 @@
dp = kmem_intr_alloc(sizeof(*dp), KM_NOSLEEP);
mutex_enter(&nd6_dad_lock);
- if (nd6_dad_find(ifa, NULL) != NULL) {
+ if (nd6_dad_find(ifa, NULL, NULL) != NULL) {
mutex_exit(&nd6_dad_lock);
/* DAD already in progress */
if (dp != NULL)
@@ -1237,7 +1237,6 @@
dp->dad_ifa = ifa;
ifaref(ifa); /* just for safety */
dp->dad_count = ip6_dad_count;
- dp->dad_ns_icount = dp->dad_na_icount = 0;
dp->dad_ns_ocount = dp->dad_ns_tcount = 0;
dp->dad_ns_lcount = 0;
TAILQ_INSERT_TAIL(&dadq, (struct dadq *)dp, dad_list);
@@ -1266,7 +1265,7 @@
return;
mutex_enter(&nd6_dad_lock);
- dp = nd6_dad_find(ifa, NULL);
+ dp = nd6_dad_find(ifa, NULL, NULL);
if (dp == NULL) {
mutex_exit(&nd6_dad_lock);
/* DAD wasn't started yet */
@@ -1287,7 +1286,6 @@
{
struct ifaddr *ifa;
struct in6_ifaddr *ia;
- int duplicate = 0;
char ip6buf[INET6_ADDRSTRLEN];
bool need_free = false;
@@ -1336,42 +1334,19 @@
(long)ND_IFINFO(ifa->ifa_ifp)->retrans * hz / 1000);
} else {
/*
- * We have transmitted sufficient number of DAD packets.
- * See what we've got.
+ * We are done with DAD. No NA came, no NS came.
+ * No duplicate address found.
*/
- if (dp->dad_na_icount) {
- /*
- * the check is in nd6_dad_na_input(),
- * but just in case
- */
- duplicate++;
- }
-
- if (dp->dad_ns_icount) {
- /* We've seen NS, means DAD has failed. */
- duplicate++;
- }
+ ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
+ rt_newaddrmsg(RTM_NEWADDR, ifa, 0, NULL);
- if (duplicate) {
- nd6_dad_duplicated(dp);
- nd6_dad_stoptimer(dp);
- need_free = true;
- } else {
- /*
- * We are done with DAD. No NA came, no NS came.
- * No duplicate address found.
- */
- ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
- rt_newaddrmsg(RTM_NEWADDR, ifa, 0, NULL);
+ nd6log(LOG_DEBUG,
+ "%s: DAD complete for %s - no duplicates found\n",
+ if_name(ifa->ifa_ifp),
+ IN6_PRINT(ip6buf, &ia->ia_addr.sin6_addr));
- nd6log(LOG_DEBUG,
- "%s: DAD complete for %s - no duplicates found\n",
- if_name(ifa->ifa_ifp),
- IN6_PRINT(ip6buf, &ia->ia_addr.sin6_addr));
-
- nd6_dad_stoptimer(dp);
- need_free = true;
- }
+ nd6_dad_stoptimer(dp);
+ need_free = true;
}
done:
mutex_exit(&nd6_dad_lock);
@@ -1386,9 +1361,8 @@
}
static void
-nd6_dad_duplicated(struct dadq *dp)
+nd6_dad_duplicated(struct ifaddr *ifa, struct dadq *dp)
{
- struct ifaddr *ifa = dp->dad_ifa;
struct in6_ifaddr *ia;
struct ifnet *ifp;
char ip6buf[INET6_ADDRSTRLEN];
@@ -1398,11 +1372,12 @@
ifp = ifa->ifa_ifp;
ia = (struct in6_ifaddr *)ifa;
+#if 0
log(LOG_ERR, "%s: DAD detected duplicate IPv6 address %s: "
- "NS in/out/loopback=%d/%d/%d, NA in=%d\n",
+ "NS in/out/loopback=%d/%d\n",
if_name(ifp), IN6_PRINT(ip6buf, &ia->ia_addr.sin6_addr),
- dp->dad_ns_icount, dp->dad_ns_ocount, dp->dad_ns_lcount,
- dp->dad_na_icount);
+ dp->dad_ns_ocount, dp->dad_ns_lcount)
+#endif
ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
ia->ia6_flags |= IN6_IFF_DUPLICATED;
@@ -1481,41 +1456,19 @@
nd6_dad_ns_input(struct ifaddr *ifa, struct nd_opt_nonce *nonce)
{
struct dadq *dp;
- int duplicate;
+ bool found_nonce = false;
- if (ifa == NULL)
- panic("ifa == NULL in nd6_dad_ns_input");
-
- duplicate = 0;
+ KASSERT(ifa != NULL);
mutex_enter(&nd6_dad_lock);
- dp = nd6_dad_find(ifa, nonce);
-
- /*
- * if I'm yet to start DAD, someone else started using this address
- * first. I have a duplicate and you win.
- */
- if (dp == NULL || dp->dad_ns_ocount == 0)
- duplicate++;
-
- /* XXX more checks for loopback situation - see nd6_dad_timer too */
-
- if (duplicate) {
- if (dp) {
- nd6_dad_duplicated(dp);
+ dp = nd6_dad_find(ifa, nonce, &found_nonce);
+ if (!found_nonce) {
+ nd6_dad_duplicated(ifa, dp);
+ if (dp != NULL)
nd6_dad_stoptimer(dp);
- }
- } else {
- /*
- * not sure if I got a duplicate.
- * increment ns count and see what happens.
- */
- if (dp)
- dp->dad_ns_icount++;
}
mutex_exit(&nd6_dad_lock);
-
- if (duplicate && dp) {
+ if (dp != NULL) {
nd6_dad_destroytimer(dp);
ifafree(ifa);
}
@@ -1529,21 +1482,15 @@
KASSERT(ifa != NULL);
mutex_enter(&nd6_dad_lock);
-
- dp = nd6_dad_find(ifa, NULL);
+ dp = nd6_dad_find(ifa, NULL, NULL);
if (dp == NULL) {
mutex_exit(&nd6_dad_lock);
return;
}
- dp->dad_na_icount++;
-
- /* remove the address. */
- nd6_dad_duplicated(dp);
+ nd6_dad_duplicated(ifa, dp);
nd6_dad_stoptimer(dp);
-
mutex_exit(&nd6_dad_lock);
-
nd6_dad_destroytimer(dp);
ifafree(ifa);
}
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