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Index: sys/netinet/icmp6.h
===================================================================
--- sys/netinet/icmp6.h
+++ sys/netinet/icmp6.h
@@ -639,6 +639,8 @@
uint64_t icp6s_overflowprfx; /* Too many prefixes. */
uint64_t icp6s_overflownndp; /* Too many neighbour entries. */
uint64_t icp6s_overflowredirect;/* Too many redirects. */
+ uint64_t icp6s_invlhlim; /* Invalid hop limit. */
+ uint64_t icp6s_spare[32];
};
#ifdef _KERNEL
Index: sys/netinet6/icmp6.c
===================================================================
--- sys/netinet6/icmp6.c
+++ sys/netinet6/icmp6.c
@@ -2261,7 +2261,8 @@
ip6_sprintf(ip6buf, &src6)));
goto bad;
}
- if (ip6->ip6_hlim != 255) {
+ if (__predict_false(ip6->ip6_hlim != 255)) {
+ ICMP6STAT_INC(icp6s_invlhlim);
nd6log((LOG_ERR,
"ICMP6 redirect sent from %s rejected; "
"hlim=%d (must be 255)\n",
Index: sys/netinet6/nd6_nbr.c
===================================================================
--- sys/netinet6/nd6_nbr.c
+++ sys/netinet6/nd6_nbr.c
@@ -136,7 +136,8 @@
ifp = m->m_pkthdr.rcvif;
ip6 = mtod(m, struct ip6_hdr *);
- if (ip6->ip6_hlim != 255) {
+ if (__predict_false(ip6->ip6_hlim != 255)) {
+ ICMP6STAT_INC(icp6s_invlhlim);
nd6log((LOG_ERR,
"nd6_ns_input: invalid hlim (%d) from %s to %s on %s\n",
ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src),
@@ -641,7 +642,8 @@
ifp = m->m_pkthdr.rcvif;
ip6 = mtod(m, struct ip6_hdr *);
- if (ip6->ip6_hlim != 255) {
+ if (__predict_false(ip6->ip6_hlim != 255)) {
+ ICMP6STAT_INC(icp6s_invlhlim);
nd6log((LOG_ERR,
"nd6_na_input: invalid hlim (%d) from %s to %s on %s\n",
ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src),
Index: sys/netinet6/nd6_rtr.c
===================================================================
--- sys/netinet6/nd6_rtr.c
+++ sys/netinet6/nd6_rtr.c
@@ -177,7 +177,8 @@
/* Sanity checks */
ip6 = mtod(m, struct ip6_hdr *);
- if (ip6->ip6_hlim != 255) {
+ if (__predict_false(ip6->ip6_hlim != 255)) {
+ ICMP6STAT_INC(icp6s_invlhlim);
nd6log((LOG_ERR,
"%s: invalid hlim (%d) from %s to %s on %s\n", __func__,
ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src),
@@ -376,7 +377,8 @@
goto freeit;
ip6 = mtod(m, struct ip6_hdr *);
- if (ip6->ip6_hlim != 255) {
+ if (__predict_false(ip6->ip6_hlim != 255)) {
+ ICMP6STAT_INC(icp6s_invlhlim);
nd6log((LOG_ERR,
"%s: invalid hlim (%d) from %s to %s on %s\n", __func__,
ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src),
Index: usr.bin/netstat/inet6.c
===================================================================
--- usr.bin/netstat/inet6.c
+++ usr.bin/netstat/inet6.c
@@ -1063,6 +1063,8 @@
"{N:/neighbour entries overflow%s}\n");
p(icp6s_overflowredirect, "\t{:redirect-overflows/%ju} "
"{N:/redirect overflow%s}\n");
+ p(icp6s_invlhlim, "\t{:dropped-invalid-hop-limit/%ju} "
+ "{N:/message%s with invalid hop limit}\n");
xo_close_container("errors");
p(icp6s_pmtuchg, "\t{:path-mtu-changes/%ju} {N:/path MTU change%s}\n");
#undef p

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