From af4aa758c3512bec8233549e138b03741c5404f9 Mon Sep 17 00:00:00 2001 From: Quentin Armitage Date: Sat, 14 Oct 2023 15:37:19 +0100 Subject: [PATCH] vrrp: Set sysctl arp_ignore to 1 on IPv6 VMACs Setting arp_ignore to 1 ensures that the VMAC interface does not respond to ARP requests for IPv4 addresses not configured on the VMAC. Signed-off-by: Quentin Armitage --- keepalived/include/vrrp_if_config.h | 2 +- keepalived/vrrp/vrrp_if_config.c | 28 ++++++++++++++++++++-------- keepalived/vrrp/vrrp_vmac.c | 5 ++--- 3 files changed, 23 insertions(+), 12 deletions(-) diff --git a/keepalived/include/vrrp_if_config.h b/keepalived/include/vrrp_if_config.h index 35465cd..c35e56e 100644 --- a/keepalived/include/vrrp_if_config.h +++ b/keepalived/include/vrrp_if_config.h @@ -34,7 +34,7 @@ extern void set_promote_secondaries(interface_t*); extern void reset_promote_secondaries(interface_t*); #ifdef _HAVE_VRRP_VMAC_ extern void restore_rp_filter(void); -extern void set_interface_parameters(const interface_t*, interface_t*); +extern void set_interface_parameters(const interface_t*, interface_t*, sa_family_t); extern void reset_interface_parameters(interface_t*); extern void link_set_ipv6(const interface_t*, bool); #endif diff --git a/keepalived/vrrp/vrrp_if_config.c b/keepalived/vrrp/vrrp_if_config.c index cfce7e2..fbfd34c 100644 --- a/keepalived/vrrp/vrrp_if_config.c +++ b/keepalived/vrrp/vrrp_if_config.c @@ -81,6 +81,11 @@ static sysctl_opts_t vmac_sysctl[] = { { 0, 0} }; +static sysctl_opts_t vmac_sysctl_6[] = { + { IPV4_DEVCONF_ARP_IGNORE, 1 }, + { 0, 0} +}; + #endif #endif @@ -216,11 +221,14 @@ netlink_set_interface_flags(unsigned ifindex, const sysctl_opts_t *sys_opts) #ifdef _HAVE_VRRP_VMAC_ static inline int -netlink_set_interface_parameters(const interface_t *ifp, interface_t *base_ifp) +netlink_set_interface_parameters(const interface_t *ifp, interface_t *base_ifp, sa_family_t family) { - if (netlink_set_interface_flags(ifp->ifindex, vmac_sysctl)) + if (netlink_set_interface_flags(ifp->ifindex, family == AF_INET6 ? vmac_sysctl_6 : vmac_sysctl)) return -1; + if (family == AF_INET6) + return 0; + /* If the underlying interface is a MACVLAN that has been moved into * a separate network namespace from the parent, we can't access the * parent. */ @@ -271,9 +279,9 @@ netlink_reset_interface_parameters(const interface_t* ifp) } static inline void -set_interface_parameters_devconf(const interface_t *ifp, interface_t *base_ifp) +set_interface_parameters_devconf(const interface_t *ifp, interface_t *base_ifp, sa_family_t family) { - if (netlink_set_interface_parameters(ifp, base_ifp)) + if (netlink_set_interface_parameters(ifp, base_ifp, family)) log_message(LOG_INFO, "Unable to set parameters for %s", ifp->ifname); } @@ -310,11 +318,15 @@ reset_promote_secondaries_devconf(interface_t *ifp) #ifdef _HAVE_VRRP_VMAC_ static inline void -set_interface_parameters_sysctl(const interface_t *ifp, interface_t *base_ifp) +set_interface_parameters_sysctl(const interface_t *ifp, interface_t *base_ifp, sa_family_t family) { unsigned val; set_sysctl("net/ipv4/conf", ifp->ifname, "arp_ignore", 1); + + if (family == AF_INET6) + return; + set_sysctl("net/ipv4/conf", ifp->ifname, "accept_local", 1); set_sysctl("net/ipv4/conf", ifp->ifname, "rp_filter", 0); @@ -524,15 +536,15 @@ restore_rp_filter(void) } void -set_interface_parameters(const interface_t *ifp, interface_t *base_ifp) +set_interface_parameters(const interface_t *ifp, interface_t *base_ifp, sa_family_t family) { if (all_rp_filter == UINT_MAX) clear_rp_filter(); #ifdef _HAVE_IPV4_DEVCONF_ - set_interface_parameters_devconf(ifp, base_ifp); + set_interface_parameters_devconf(ifp, base_ifp, family); #else - set_interface_parameters_sysctl(ifp, base_ifp); + set_interface_parameters_sysctl(ifp, base_ifp, family); #endif } diff --git a/keepalived/vrrp/vrrp_vmac.c b/keepalived/vrrp/vrrp_vmac.c index e5ff0e9..021953a 100644 --- a/keepalived/vrrp/vrrp_vmac.c +++ b/keepalived/vrrp/vrrp_vmac.c @@ -407,10 +407,9 @@ netlink_link_add_vmac(vrrp_t *vrrp, const interface_t *old_interface) if (!ifp->ifindex) return false; - if (vrrp->family == AF_INET && create_interface) { + if (create_interface) { /* Set the necessary kernel parameters to make macvlans work for us */ -// If this saves current base_ifp's settings, we need to be careful if multiple VMACs on same i/f - set_interface_parameters(ifp, ifp->base_ifp); + set_interface_parameters(ifp, ifp->base_ifp, vrrp->family); } #ifdef _WITH_FIREWALL_ -- 2.34.1