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icmp6: Count packets dropped due to an invalid hop limit

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Pad the icmp6stat structure so that we can add more counters in the
future without breaking compatibility again, last done in r358620.
Annotate the rarely executed error paths with __predict_false while
here.

Reviewed by:	bz, melifaro
Sponsored by:	NetApp, Inc.
Sponsored by:	Klara, Inc.
Differential Revision:	https://reviews.freebsd.org/D26578
This commit is contained in:
Mark Johnston 2020-10-19 17:07:19 +00:00
parent d80126a6f4
commit 4caea9b169
5 changed files with 14 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
sys/netinet/icmp6.h
View File

@ -639,6 +639,8 @@ struct icmp6stat {
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

3
sys/netinet6/icmp6.c
View File

@ -2261,7 +2261,8 @@ icmp6_redirect_input(struct mbuf *m, int off)
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",

6
sys/netinet6/nd6_nbr.c
View File

@ -136,7 +136,8 @@ nd6_ns_input(struct mbuf *m, int off, int icmp6len)
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 @@ nd6_na_input(struct mbuf *m, int off, int icmp6len)
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),

6
sys/netinet6/nd6_rtr.c
View File

@ -177,7 +177,8 @@ nd6_rs_input(struct mbuf *m, int off, int icmp6len)
/* 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 @@ nd6_ra_input(struct mbuf *m, int off, int icmp6len)
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),

2
usr.bin/netstat/inet6.c
View File

@ -1063,6 +1063,8 @@ icmp6_stats(u_long off, const char *name, int af1 __unused, int proto __unused)
"{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