kern/121574: [carp] CARP hash dependent on order of IP
addresses on interface
Max Laier
max at love2party.net
Tue Mar 11 03:40:02 PDT 2008
The following reply was made to PR kern/121574; it has been noted by GNATS.
From: "Max Laier" <max at love2party.net>
To: bug-followup at freebsd.org
Cc: rand at meridian-enviro.com, maddog2k at maddog2k.net
Subject: Re: kern/121574: [carp] CARP hash dependent on order of IP
addresses on interface
Date: Tue, 11 Mar 2008 11:28:34 +0100 (CET)
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(subject helps)
Please try the attached patch (mostly OpenBSD rev. 1.114 plus follow-ups).
This should fix the symptom. I have no idea why your address lists would
get skewed however. They "should"[tm] be in the order in which you add
aliases.
-- Max
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Index: ip_carp.c
===================================================================
RCS file: /home/mlaier/fcvs/src/sys/netinet/ip_carp.c,v
retrieving revision 1.27.2.12
diff -u -r1.27.2.12 ip_carp.c
--- ip_carp.c 1 Feb 2008 11:20:41 -0000 1.27.2.12
+++ ip_carp.c 11 Mar 2008 10:16:12 -0000
@@ -238,9 +238,12 @@
u_int8_t version = CARP_VERSION, type = CARP_ADVERTISEMENT;
u_int8_t vhid = sc->sc_vhid & 0xff;
struct ifaddr *ifa;
- int i;
+ int i, found;
+#ifdef INET
+ struct in_addr last, cur, in;
+#endif
#ifdef INET6
- struct in6_addr in6;
+ struct in6_addr last6, cur6, in6;
#endif
if (sc->sc_carpdev)
@@ -261,21 +264,44 @@
SHA1Update(&sc->sc_sha1, (void *)&type, sizeof(type));
SHA1Update(&sc->sc_sha1, (void *)&vhid, sizeof(vhid));
#ifdef INET
- TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) {
- if (ifa->ifa_addr->sa_family == AF_INET)
- SHA1Update(&sc->sc_sha1,
- (void *)&ifatoia(ifa)->ia_addr.sin_addr.s_addr,
- sizeof(struct in_addr));
- }
+ cur.s_addr = 0;
+ do {
+ found = 0;
+ last = cur;
+ cur.s_addr = 0xffffffff;
+ TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) {
+ in.s_addr = ifatoia(ifa)->ia_addr.sin_addr.s_addr;
+ if (ifa->ifa_addr->sa_family == AF_INET &&
+ ntohl(in.s_addr) > ntohl(last.s_addr) &&
+ ntohl(in.s_addr) < ntohl(cur.s_addr)) {
+ cur.s_addr = in.s_addr;
+ found++;
+ }
+ }
+ if (found)
+ SHA1Update(&sc->sc_sha1, (void *)&cur, sizeof(cur));
+ } while (found);
#endif /* INET */
#ifdef INET6
- TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) {
- if (ifa->ifa_addr->sa_family == AF_INET6) {
+ memset(&cur6, 0, sizeof(cur6));
+ do {
+ found = 0;
+ last6 = cur6;
+ memset(&cur6, 0xff, sizeof(cur6));
+ TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) {
in6 = ifatoia6(ifa)->ia_addr.sin6_addr;
- in6_clearscope(&in6);
- SHA1Update(&sc->sc_sha1, (void *)&in6, sizeof(in6));
+ if (IN6_IS_SCOPE_EMBED(&in6))
+ in6.s6_addr16[1] = 0;
+ if (ifa->ifa_addr->sa_family == AF_INET6 &&
+ memcmp(&in6, &last6, sizeof(in6)) > 0 &&
+ memcmp(&in6, &cur6, sizeof(in6)) < 0) {
+ cur6 = in6;
+ found++;
+ }
}
- }
+ if (found)
+ SHA1Update(&sc->sc_sha1, (void *)&cur6, sizeof(cur6));
+ } while (found);
#endif /* INET6 */
/* convert ipad to opad */
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Index: ip_carp.c
===================================================================
RCS file: /home/mlaier/fcvs/src/sys/netinet/ip_carp.c,v
retrieving revision 1.27.2.12
diff -u -r1.27.2.12 ip_carp.c
--- ip_carp.c 1 Feb 2008 11:20:41 -0000 1.27.2.12
+++ ip_carp.c 11 Mar 2008 10:20:42 -0000
@@ -238,9 +238,12 @@
u_int8_t version = CARP_VERSION, type = CARP_ADVERTISEMENT;
u_int8_t vhid = sc->sc_vhid & 0xff;
struct ifaddr *ifa;
- int i;
+ int i, found;
+#ifdef INET
+ struct in_addr last, cur, in;
+#endif
#ifdef INET6
- struct in6_addr in6;
+ struct in6_addr last6, cur6, in6;
#endif
if (sc->sc_carpdev)
@@ -261,21 +264,45 @@
SHA1Update(&sc->sc_sha1, (void *)&type, sizeof(type));
SHA1Update(&sc->sc_sha1, (void *)&vhid, sizeof(vhid));
#ifdef INET
- TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) {
- if (ifa->ifa_addr->sa_family == AF_INET)
- SHA1Update(&sc->sc_sha1,
- (void *)&ifatoia(ifa)->ia_addr.sin_addr.s_addr,
- sizeof(struct in_addr));
- }
+ cur.s_addr = 0;
+ do {
+ found = 0;
+ last = cur;
+ cur.s_addr = 0xffffffff;
+ TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) {
+ in.s_addr = ifatoia(ifa)->ia_addr.sin_addr.s_addr;
+ if (ifa->ifa_addr->sa_family == AF_INET &&
+ ntohl(in.s_addr) > ntohl(last.s_addr) &&
+ ntohl(in.s_addr) < ntohl(cur.s_addr)) {
+ cur.s_addr = in.s_addr;
+ found++;
+ }
+ }
+ if (found)
+ SHA1Update(&sc->sc_sha1, (void *)&cur, sizeof(cur));
+ } while (found);
#endif /* INET */
#ifdef INET6
- TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) {
- if (ifa->ifa_addr->sa_family == AF_INET6) {
+ memset(&cur6, 0, sizeof(cur6));
+ do {
+ found = 0;
+ last6 = cur6;
+ memset(&cur6, 0xff, sizeof(cur6));
+ TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) {
in6 = ifatoia6(ifa)->ia_addr.sin6_addr;
- in6_clearscope(&in6);
- SHA1Update(&sc->sc_sha1, (void *)&in6, sizeof(in6));
+ if (IN6_IS_SCOPE_LINKLOCAL(&in6) ||
+ IN6_IS_ADDR_MC_INTFACELOCAL(&in6))
+ in6.s6_addr16[1] = 0;
+ if (ifa->ifa_addr->sa_family == AF_INET6 &&
+ memcmp(&in6, &last6, sizeof(in6)) > 0 &&
+ memcmp(&in6, &cur6, sizeof(in6)) < 0) {
+ cur6 = in6;
+ found++;
+ }
}
- }
+ if (found)
+ SHA1Update(&sc->sc_sha1, (void *)&cur6, sizeof(cur6));
+ } while (found);
#endif /* INET6 */
/* convert ipad to opad */
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