diff options
Diffstat (limited to 'freebsd/sys/netinet/ip_carp.c')
| -rw-r--r-- | freebsd/sys/netinet/ip_carp.c | 2681 |
1 files changed, 1200 insertions, 1481 deletions
diff --git a/freebsd/sys/netinet/ip_carp.c b/freebsd/sys/netinet/ip_carp.c index 330023b1..6b683f45 100644 --- a/freebsd/sys/netinet/ip_carp.c +++ b/freebsd/sys/netinet/ip_carp.c @@ -1,8 +1,10 @@ #include <machine/rtems-bsd-kernel-space.h> -/* - * Copyright (c) 2002 Michael Shalayeff. All rights reserved. - * Copyright (c) 2003 Ryan McBride. All rights reserved. +/*- + * Copyright (c) 2002 Michael Shalayeff. + * Copyright (c) 2003 Ryan McBride. + * Copyright (c) 2011 Gleb Smirnoff <glebius@FreeBSD.org> + * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions @@ -33,38 +35,33 @@ __FBSDID("$FreeBSD$"); #include <rtems/bsd/local/opt_inet.h> #include <rtems/bsd/local/opt_inet6.h> -#include <sys/types.h> #include <rtems/bsd/sys/param.h> #include <sys/systm.h> -#include <sys/conf.h> +#include <sys/bus.h> +#include <sys/jail.h> #include <sys/kernel.h> #include <sys/limits.h> #include <sys/malloc.h> #include <sys/mbuf.h> #include <sys/module.h> -#include <sys/time.h> #include <sys/priv.h> #include <sys/proc.h> #include <sys/protosw.h> +#include <sys/socket.h> +#include <sys/sockio.h> #include <sys/sysctl.h> #include <sys/syslog.h> -#include <sys/signalvar.h> -#include <sys/filio.h> -#include <sys/sockio.h> - -#include <sys/socket.h> -#include <sys/vnode.h> - -#include <machine/stdarg.h> +#include <sys/taskqueue.h> +#include <sys/counter.h> -#include <net/bpf.h> #include <net/ethernet.h> #include <net/fddi.h> -#include <net/iso88025.h> #include <net/if.h> -#include <net/if_clone.h> +#include <net/if_var.h> #include <net/if_dl.h> +#include <net/if_llatbl.h> #include <net/if_types.h> +#include <net/iso88025.h> #include <net/route.h> #include <net/vnet.h> @@ -73,12 +70,9 @@ __FBSDID("$FreeBSD$"); #include <netinet/in_var.h> #include <netinet/ip_carp.h> #include <netinet/ip.h> - #include <machine/in_cksum.h> #endif - #ifdef INET -#include <netinet/in_systm.h> #include <netinet/ip_var.h> #include <netinet/if_ether.h> #endif @@ -86,182 +80,254 @@ __FBSDID("$FreeBSD$"); #ifdef INET6 #include <netinet/icmp6.h> #include <netinet/ip6.h> -#include <netinet6/ip6protosw.h> +#include <netinet6/in6_var.h> #include <netinet6/ip6_var.h> #include <netinet6/scope6_var.h> -#include <netinet6/in6_var.h> #include <netinet6/nd6.h> #endif #include <crypto/sha1.h> -#define CARP_IFNAME "carp" -static MALLOC_DEFINE(M_CARP, "CARP", "CARP interfaces"); -SYSCTL_DECL(_net_inet_carp); +static MALLOC_DEFINE(M_CARP, "CARP", "CARP addresses"); struct carp_softc { - struct ifnet *sc_ifp; /* Interface clue */ - struct ifnet *sc_carpdev; /* Pointer to parent interface */ - struct in_ifaddr *sc_ia; /* primary iface address */ + struct ifnet *sc_carpdev; /* Pointer to parent ifnet. */ + struct ifaddr **sc_ifas; /* Our ifaddrs. */ + struct sockaddr_dl sc_addr; /* Our link level address. */ + struct callout sc_ad_tmo; /* Advertising timeout. */ #ifdef INET - struct ip_moptions sc_imo; + struct callout sc_md_tmo; /* Master down timeout. */ #endif #ifdef INET6 - struct in6_ifaddr *sc_ia6; /* primary iface address v6 */ - struct ip6_moptions sc_im6o; -#endif /* INET6 */ - TAILQ_ENTRY(carp_softc) sc_list; - - enum { INIT = 0, BACKUP, MASTER } sc_state; + struct callout sc_md6_tmo; /* XXX: Master down timeout. */ +#endif + struct mtx sc_mtx; - int sc_flags_backup; - int sc_suppress; + int sc_vhid; + int sc_advskew; + int sc_advbase; - int sc_sendad_errors; + int sc_naddrs; + int sc_naddrs6; + int sc_ifasiz; + enum { INIT = 0, BACKUP, MASTER } sc_state; + int sc_suppress; + int sc_sendad_errors; #define CARP_SENDAD_MAX_ERRORS 3 - int sc_sendad_success; + int sc_sendad_success; #define CARP_SENDAD_MIN_SUCCESS 3 - int sc_vhid; - int sc_advskew; - int sc_naddrs; - int sc_naddrs6; - int sc_advbase; /* seconds */ - int sc_init_counter; - u_int64_t sc_counter; + int sc_init_counter; + uint64_t sc_counter; /* authentication */ -#define CARP_HMAC_PAD 64 +#define CARP_HMAC_PAD 64 unsigned char sc_key[CARP_KEY_LEN]; unsigned char sc_pad[CARP_HMAC_PAD]; SHA1_CTX sc_sha1; - struct callout sc_ad_tmo; /* advertisement timeout */ - struct callout sc_md_tmo; /* master down timeout */ - struct callout sc_md6_tmo; /* master down timeout */ - - LIST_ENTRY(carp_softc) sc_next; /* Interface clue */ + TAILQ_ENTRY(carp_softc) sc_list; /* On the carp_if list. */ + LIST_ENTRY(carp_softc) sc_next; /* On the global list. */ }; -#define SC2IFP(sc) ((sc)->sc_ifp) - -int carp_suppress_preempt = 0; -int carp_opts[CARPCTL_MAXID] = { 0, 1, 0, 1, 0, 0 }; /* XXX for now */ -SYSCTL_NODE(_net_inet, IPPROTO_CARP, carp, CTLFLAG_RW, 0, "CARP"); -SYSCTL_INT(_net_inet_carp, CARPCTL_ALLOW, allow, CTLFLAG_RW, - &carp_opts[CARPCTL_ALLOW], 0, "Accept incoming CARP packets"); -SYSCTL_INT(_net_inet_carp, CARPCTL_PREEMPT, preempt, CTLFLAG_RW, - &carp_opts[CARPCTL_PREEMPT], 0, "high-priority backup preemption mode"); -SYSCTL_INT(_net_inet_carp, CARPCTL_LOG, log, CTLFLAG_RW, - &carp_opts[CARPCTL_LOG], 0, "log bad carp packets"); -SYSCTL_INT(_net_inet_carp, CARPCTL_ARPBALANCE, arpbalance, CTLFLAG_RW, - &carp_opts[CARPCTL_ARPBALANCE], 0, "balance arp responses"); -SYSCTL_INT(_net_inet_carp, OID_AUTO, suppress_preempt, CTLFLAG_RD, - &carp_suppress_preempt, 0, "Preemption is suppressed"); - -struct carpstats carpstats; -SYSCTL_STRUCT(_net_inet_carp, CARPCTL_STATS, stats, CTLFLAG_RW, - &carpstats, carpstats, - "CARP statistics (struct carpstats, netinet/ip_carp.h)"); struct carp_if { - TAILQ_HEAD(, carp_softc) vhif_vrs; - int vhif_nvrs; - - struct ifnet *vhif_ifp; - struct mtx vhif_mtx; +#ifdef INET + int cif_naddrs; +#endif +#ifdef INET6 + int cif_naddrs6; +#endif + TAILQ_HEAD(, carp_softc) cif_vrs; +#ifdef INET + struct ip_moptions cif_imo; +#endif +#ifdef INET6 + struct ip6_moptions cif_im6o; +#endif + struct ifnet *cif_ifp; + struct mtx cif_mtx; + uint32_t cif_flags; +#define CIF_PROMISC 0x00000001 }; #define CARP_INET 0 #define CARP_INET6 1 static int proto_reg[] = {-1, -1}; -/* Get carp_if from softc. Valid after carp_set_addr{,6}. */ -#define SC2CIF(sc) ((struct carp_if *)(sc)->sc_carpdev->if_carp) +/* + * Brief design of carp(4). + * + * Any carp-capable ifnet may have a list of carp softcs hanging off + * its ifp->if_carp pointer. Each softc represents one unique virtual + * host id, or vhid. The softc has a back pointer to the ifnet. All + * softcs are joined in a global list, which has quite limited use. + * + * Any interface address that takes part in CARP negotiation has a + * pointer to the softc of its vhid, ifa->ifa_carp. That could be either + * AF_INET or AF_INET6 address. + * + * Although, one can get the softc's backpointer to ifnet and traverse + * through its ifp->if_addrhead queue to find all interface addresses + * involved in CARP, we keep a growable array of ifaddr pointers. This + * allows us to avoid grabbing the IF_ADDR_LOCK() in many traversals that + * do calls into the network stack, thus avoiding LORs. + * + * Locking: + * + * Each softc has a lock sc_mtx. It is used to synchronise carp_input_c(), + * callout-driven events and ioctl()s. + * + * To traverse the list of softcs on an ifnet we use CIF_LOCK(), to + * traverse the global list we use the mutex carp_mtx. + * + * Known issues with locking: + * + * - Sending ad, we put the pointer to the softc in an mtag, and no reference + * counting is done on the softc. + * - On module unload we may race (?) with packet processing thread + * dereferencing our function pointers. + */ + +/* Accept incoming CARP packets. */ +static VNET_DEFINE(int, carp_allow) = 1; +#define V_carp_allow VNET(carp_allow) -/* lock per carp_if queue */ -#define CARP_LOCK_INIT(cif) mtx_init(&(cif)->vhif_mtx, "carp_if", \ - NULL, MTX_DEF) -#define CARP_LOCK_DESTROY(cif) mtx_destroy(&(cif)->vhif_mtx) -#define CARP_LOCK_ASSERT(cif) mtx_assert(&(cif)->vhif_mtx, MA_OWNED) -#define CARP_LOCK(cif) mtx_lock(&(cif)->vhif_mtx) -#define CARP_UNLOCK(cif) mtx_unlock(&(cif)->vhif_mtx) +/* Preempt slower nodes. */ +static VNET_DEFINE(int, carp_preempt) = 0; +#define V_carp_preempt VNET(carp_preempt) -#define CARP_SCLOCK(sc) mtx_lock(&SC2CIF(sc)->vhif_mtx) -#define CARP_SCUNLOCK(sc) mtx_unlock(&SC2CIF(sc)->vhif_mtx) -#define CARP_SCLOCK_ASSERT(sc) mtx_assert(&SC2CIF(sc)->vhif_mtx, MA_OWNED) +/* Log level. */ +static VNET_DEFINE(int, carp_log) = 1; +#define V_carp_log VNET(carp_log) + +/* Global advskew demotion. */ +static VNET_DEFINE(int, carp_demotion) = 0; +#define V_carp_demotion VNET(carp_demotion) + +/* Send error demotion factor. */ +static VNET_DEFINE(int, carp_senderr_adj) = CARP_MAXSKEW; +#define V_carp_senderr_adj VNET(carp_senderr_adj) + +/* Iface down demotion factor. */ +static VNET_DEFINE(int, carp_ifdown_adj) = CARP_MAXSKEW; +#define V_carp_ifdown_adj VNET(carp_ifdown_adj) + +static int carp_demote_adj_sysctl(SYSCTL_HANDLER_ARGS); + +SYSCTL_NODE(_net_inet, IPPROTO_CARP, carp, CTLFLAG_RW, 0, "CARP"); +SYSCTL_INT(_net_inet_carp, OID_AUTO, allow, CTLFLAG_VNET | CTLFLAG_RW, + &VNET_NAME(carp_allow), 0, "Accept incoming CARP packets"); +SYSCTL_INT(_net_inet_carp, OID_AUTO, preempt, CTLFLAG_VNET | CTLFLAG_RW, + &VNET_NAME(carp_preempt), 0, "High-priority backup preemption mode"); +SYSCTL_INT(_net_inet_carp, OID_AUTO, log, CTLFLAG_VNET | CTLFLAG_RW, + &VNET_NAME(carp_log), 0, "CARP log level"); +SYSCTL_PROC(_net_inet_carp, OID_AUTO, demotion, + CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW, + 0, 0, carp_demote_adj_sysctl, "I", + "Adjust demotion factor (skew of advskew)"); +SYSCTL_INT(_net_inet_carp, OID_AUTO, senderr_demotion_factor, + CTLFLAG_VNET | CTLFLAG_RW, + &VNET_NAME(carp_senderr_adj), 0, "Send error demotion factor adjustment"); +SYSCTL_INT(_net_inet_carp, OID_AUTO, ifdown_demotion_factor, + CTLFLAG_VNET | CTLFLAG_RW, + &VNET_NAME(carp_ifdown_adj), 0, + "Interface down demotion factor adjustment"); + +VNET_PCPUSTAT_DEFINE(struct carpstats, carpstats); +VNET_PCPUSTAT_SYSINIT(carpstats); +VNET_PCPUSTAT_SYSUNINIT(carpstats); + +#define CARPSTATS_ADD(name, val) \ + counter_u64_add(VNET(carpstats)[offsetof(struct carpstats, name) / \ + sizeof(uint64_t)], (val)) +#define CARPSTATS_INC(name) CARPSTATS_ADD(name, 1) + +SYSCTL_VNET_PCPUSTAT(_net_inet_carp, OID_AUTO, stats, struct carpstats, + carpstats, "CARP statistics (struct carpstats, netinet/ip_carp.h)"); + +#define CARP_LOCK_INIT(sc) mtx_init(&(sc)->sc_mtx, "carp_softc", \ + NULL, MTX_DEF) +#define CARP_LOCK_DESTROY(sc) mtx_destroy(&(sc)->sc_mtx) +#define CARP_LOCK_ASSERT(sc) mtx_assert(&(sc)->sc_mtx, MA_OWNED) +#define CARP_LOCK(sc) mtx_lock(&(sc)->sc_mtx) +#define CARP_UNLOCK(sc) mtx_unlock(&(sc)->sc_mtx) +#define CIF_LOCK_INIT(cif) mtx_init(&(cif)->cif_mtx, "carp_if", \ + NULL, MTX_DEF) +#define CIF_LOCK_DESTROY(cif) mtx_destroy(&(cif)->cif_mtx) +#define CIF_LOCK_ASSERT(cif) mtx_assert(&(cif)->cif_mtx, MA_OWNED) +#define CIF_LOCK(cif) mtx_lock(&(cif)->cif_mtx) +#define CIF_UNLOCK(cif) mtx_unlock(&(cif)->cif_mtx) +#define CIF_FREE(cif) do { \ + CIF_LOCK(cif); \ + if (TAILQ_EMPTY(&(cif)->cif_vrs)) \ + carp_free_if(cif); \ + else \ + CIF_UNLOCK(cif); \ +} while (0) #define CARP_LOG(...) do { \ - if (carp_opts[CARPCTL_LOG] > 0) \ - log(LOG_INFO, __VA_ARGS__); \ + if (V_carp_log > 0) \ + log(LOG_INFO, "carp: " __VA_ARGS__); \ } while (0) #define CARP_DEBUG(...) do { \ - if (carp_opts[CARPCTL_LOG] > 1) \ + if (V_carp_log > 1) \ log(LOG_DEBUG, __VA_ARGS__); \ } while (0) -static void carp_hmac_prepare(struct carp_softc *); -static void carp_hmac_generate(struct carp_softc *, u_int32_t *, - unsigned char *); -static int carp_hmac_verify(struct carp_softc *, u_int32_t *, - unsigned char *); -static void carp_setroute(struct carp_softc *, int); -static void carp_input_c(struct mbuf *, struct carp_header *, sa_family_t); -static int carp_clone_create(struct if_clone *, int, caddr_t); -static void carp_clone_destroy(struct ifnet *); -static void carpdetach(struct carp_softc *, int); -static int carp_prepare_ad(struct mbuf *, struct carp_softc *, - struct carp_header *); -static void carp_send_ad_all(void); -static void carp_send_ad(void *); -static void carp_send_ad_locked(struct carp_softc *); -#ifdef INET -static void carp_send_arp(struct carp_softc *); -#endif -static void carp_master_down(void *); -static void carp_master_down_locked(struct carp_softc *); -static int carp_ioctl(struct ifnet *, u_long, caddr_t); -static int carp_looutput(struct ifnet *, struct mbuf *, struct sockaddr *, - struct route *); -static void carp_start(struct ifnet *); -static void carp_setrun(struct carp_softc *, sa_family_t); -static void carp_set_state(struct carp_softc *, int); -#ifdef INET -static int carp_addrcount(struct carp_if *, struct in_ifaddr *, int); -#endif -enum { CARP_COUNT_MASTER, CARP_COUNT_RUNNING }; +#define IFNET_FOREACH_IFA(ifp, ifa) \ + IF_ADDR_LOCK_ASSERT(ifp); \ + TAILQ_FOREACH((ifa), &(ifp)->if_addrhead, ifa_link) \ + if ((ifa)->ifa_carp != NULL) -#ifdef INET -static void carp_multicast_cleanup(struct carp_softc *, int dofree); -static int carp_set_addr(struct carp_softc *, struct sockaddr_in *); -static int carp_del_addr(struct carp_softc *, struct sockaddr_in *); -#endif -static void carp_carpdev_state_locked(struct carp_if *); -static void carp_sc_state_locked(struct carp_softc *); -#ifdef INET6 -static void carp_send_na(struct carp_softc *); -static int carp_set_addr6(struct carp_softc *, struct sockaddr_in6 *); -static int carp_del_addr6(struct carp_softc *, struct sockaddr_in6 *); -static void carp_multicast6_cleanup(struct carp_softc *, int dofree); -#endif +#define CARP_FOREACH_IFA(sc, ifa) \ + CARP_LOCK_ASSERT(sc); \ + for (int _i = 0; \ + _i < (sc)->sc_naddrs + (sc)->sc_naddrs6 && \ + ((ifa) = sc->sc_ifas[_i]) != NULL; \ + ++_i) -static LIST_HEAD(, carp_softc) carpif_list; -static struct mtx carp_mtx; -IFC_SIMPLE_DECLARE(carp, 0); +#define IFNET_FOREACH_CARP(ifp, sc) \ + CIF_LOCK_ASSERT(ifp->if_carp); \ + TAILQ_FOREACH((sc), &(ifp)->if_carp->cif_vrs, sc_list) -static eventhandler_tag if_detach_event_tag; +#define DEMOTE_ADVSKEW(sc) \ + (((sc)->sc_advskew + V_carp_demotion > CARP_MAXSKEW) ? \ + CARP_MAXSKEW : ((sc)->sc_advskew + V_carp_demotion)) -static __inline u_int16_t -carp_cksum(struct mbuf *m, int len) -{ - return (in_cksum(m, len)); -} +static void carp_input_c(struct mbuf *, struct carp_header *, sa_family_t); +static struct carp_softc + *carp_alloc(struct ifnet *); +static void carp_destroy(struct carp_softc *); +static struct carp_if + *carp_alloc_if(struct ifnet *); +static void carp_free_if(struct carp_if *); +static void carp_set_state(struct carp_softc *, int, const char* reason); +static void carp_sc_state(struct carp_softc *); +static void carp_setrun(struct carp_softc *, sa_family_t); +static void carp_master_down(void *); +static void carp_master_down_locked(struct carp_softc *, + const char* reason); +static void carp_send_ad(void *); +static void carp_send_ad_locked(struct carp_softc *); +static void carp_addroute(struct carp_softc *); +static void carp_ifa_addroute(struct ifaddr *); +static void carp_delroute(struct carp_softc *); +static void carp_ifa_delroute(struct ifaddr *); +static void carp_send_ad_all(void *, int); +static void carp_demote_adj(int, char *); + +static LIST_HEAD(, carp_softc) carp_list; +static struct mtx carp_mtx; +static struct sx carp_sx; +static struct task carp_sendall_task = + TASK_INITIALIZER(0, carp_send_ad_all, NULL); static void carp_hmac_prepare(struct carp_softc *sc) { - u_int8_t version = CARP_VERSION, type = CARP_ADVERTISEMENT; - u_int8_t vhid = sc->sc_vhid & 0xff; + uint8_t version = CARP_VERSION, type = CARP_ADVERTISEMENT; + uint8_t vhid = sc->sc_vhid & 0xff; struct ifaddr *ifa; int i, found; #ifdef INET @@ -271,18 +337,15 @@ carp_hmac_prepare(struct carp_softc *sc) struct in6_addr last6, cur6, in6; #endif - if (sc->sc_carpdev) - CARP_SCLOCK(sc); + CARP_LOCK_ASSERT(sc); - /* XXX: possible race here */ - - /* compute ipad from key */ + /* Compute ipad from key. */ bzero(sc->sc_pad, sizeof(sc->sc_pad)); bcopy(sc->sc_key, sc->sc_pad, sizeof(sc->sc_key)); for (i = 0; i < sizeof(sc->sc_pad); i++) sc->sc_pad[i] ^= 0x36; - /* precompute first part of inner hash */ + /* Precompute first part of inner hash. */ SHA1Init(&sc->sc_sha1); SHA1Update(&sc->sc_sha1, sc->sc_pad, sizeof(sc->sc_pad)); SHA1Update(&sc->sc_sha1, (void *)&version, sizeof(version)); @@ -294,8 +357,7 @@ carp_hmac_prepare(struct carp_softc *sc) found = 0; last = cur; cur.s_addr = 0xffffffff; - IF_ADDR_RLOCK(SC2IFP(sc)); - TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) { + CARP_FOREACH_IFA(sc, ifa) { 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) && @@ -304,7 +366,6 @@ carp_hmac_prepare(struct carp_softc *sc) found++; } } - IF_ADDR_RUNLOCK(SC2IFP(sc)); if (found) SHA1Update(&sc->sc_sha1, (void *)&cur, sizeof(cur)); } while (found); @@ -315,8 +376,7 @@ carp_hmac_prepare(struct carp_softc *sc) found = 0; last6 = cur6; memset(&cur6, 0xff, sizeof(cur6)); - IF_ADDR_RLOCK(SC2IFP(sc)); - TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) { + CARP_FOREACH_IFA(sc, ifa) { in6 = ifatoia6(ifa)->ia_addr.sin6_addr; if (IN6_IS_SCOPE_EMBED(&in6)) in6.s6_addr16[1] = 0; @@ -327,7 +387,6 @@ carp_hmac_prepare(struct carp_softc *sc) found++; } } - IF_ADDR_RUNLOCK(SC2IFP(sc)); if (found) SHA1Update(&sc->sc_sha1, (void *)&cur6, sizeof(cur6)); } while (found); @@ -336,17 +395,16 @@ carp_hmac_prepare(struct carp_softc *sc) /* convert ipad to opad */ for (i = 0; i < sizeof(sc->sc_pad); i++) sc->sc_pad[i] ^= 0x36 ^ 0x5c; - - if (sc->sc_carpdev) - CARP_SCUNLOCK(sc); } static void -carp_hmac_generate(struct carp_softc *sc, u_int32_t counter[2], +carp_hmac_generate(struct carp_softc *sc, uint32_t counter[2], unsigned char md[20]) { SHA1_CTX sha1ctx; + CARP_LOCK_ASSERT(sc); + /* fetch first half of inner hash */ bcopy(&sc->sc_sha1, &sha1ctx, sizeof(sha1ctx)); @@ -361,260 +419,68 @@ carp_hmac_generate(struct carp_softc *sc, u_int32_t counter[2], } static int -carp_hmac_verify(struct carp_softc *sc, u_int32_t counter[2], +carp_hmac_verify(struct carp_softc *sc, uint32_t counter[2], unsigned char md[20]) { unsigned char md2[20]; - CARP_SCLOCK_ASSERT(sc); + CARP_LOCK_ASSERT(sc); carp_hmac_generate(sc, counter, md2); return (bcmp(md, md2, sizeof(md2))); } -static void -carp_setroute(struct carp_softc *sc, int cmd) -{ - struct ifaddr *ifa; - int s; - - if (sc->sc_carpdev) - CARP_SCLOCK_ASSERT(sc); - - s = splnet(); - TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) { -#ifdef INET - if (ifa->ifa_addr->sa_family == AF_INET && - sc->sc_carpdev != NULL) { - int count = carp_addrcount( - (struct carp_if *)sc->sc_carpdev->if_carp, - ifatoia(ifa), CARP_COUNT_MASTER); - - if ((cmd == RTM_ADD && count == 1) || - (cmd == RTM_DELETE && count == 0)) - rtinit(ifa, cmd, RTF_UP | RTF_HOST); - } -#endif - } - splx(s); -} - -static int -carp_clone_create(struct if_clone *ifc, int unit, caddr_t params) -{ - - struct carp_softc *sc; - struct ifnet *ifp; - - sc = malloc(sizeof(*sc), M_CARP, M_WAITOK|M_ZERO); - ifp = SC2IFP(sc) = if_alloc(IFT_ETHER); - if (ifp == NULL) { - free(sc, M_CARP); - return (ENOSPC); - } - - sc->sc_flags_backup = 0; - sc->sc_suppress = 0; - sc->sc_advbase = CARP_DFLTINTV; - sc->sc_vhid = -1; /* required setting */ - sc->sc_advskew = 0; - sc->sc_init_counter = 1; - sc->sc_naddrs = sc->sc_naddrs6 = 0; /* M_ZERO? */ -#ifdef INET - sc->sc_imo.imo_membership = (struct in_multi **)malloc( - (sizeof(struct in_multi *) * IP_MIN_MEMBERSHIPS), M_CARP, - M_WAITOK); - sc->sc_imo.imo_mfilters = NULL; - sc->sc_imo.imo_max_memberships = IP_MIN_MEMBERSHIPS; - sc->sc_imo.imo_multicast_vif = -1; -#endif -#ifdef INET6 - sc->sc_im6o.im6o_membership = (struct in6_multi **)malloc( - (sizeof(struct in6_multi *) * IPV6_MIN_MEMBERSHIPS), M_CARP, - M_WAITOK); - sc->sc_im6o.im6o_mfilters = NULL; - sc->sc_im6o.im6o_max_memberships = IPV6_MIN_MEMBERSHIPS; - sc->sc_im6o.im6o_multicast_hlim = CARP_DFLTTL; -#endif - - callout_init(&sc->sc_ad_tmo, CALLOUT_MPSAFE); - callout_init(&sc->sc_md_tmo, CALLOUT_MPSAFE); - callout_init(&sc->sc_md6_tmo, CALLOUT_MPSAFE); - - ifp->if_softc = sc; - if_initname(ifp, CARP_IFNAME, unit); - ifp->if_mtu = ETHERMTU; - ifp->if_flags = IFF_LOOPBACK; - ifp->if_ioctl = carp_ioctl; - ifp->if_output = carp_looutput; - ifp->if_start = carp_start; - ifp->if_type = IFT_CARP; - ifp->if_snd.ifq_maxlen = ifqmaxlen; - ifp->if_hdrlen = 0; - if_attach(ifp); - bpfattach(SC2IFP(sc), DLT_NULL, sizeof(u_int32_t)); - mtx_lock(&carp_mtx); - LIST_INSERT_HEAD(&carpif_list, sc, sc_next); - mtx_unlock(&carp_mtx); - return (0); -} - -static void -carp_clone_destroy(struct ifnet *ifp) -{ - struct carp_softc *sc = ifp->if_softc; - - if (sc->sc_carpdev) - CARP_SCLOCK(sc); - carpdetach(sc, 1); /* Returns unlocked. */ - - mtx_lock(&carp_mtx); - LIST_REMOVE(sc, sc_next); - mtx_unlock(&carp_mtx); - bpfdetach(ifp); - if_detach(ifp); - if_free_type(ifp, IFT_ETHER); -#ifdef INET - free(sc->sc_imo.imo_membership, M_CARP); -#endif -#ifdef INET6 - free(sc->sc_im6o.im6o_membership, M_CARP); -#endif - free(sc, M_CARP); -} - -/* - * This function can be called on CARP interface destroy path, - * and in case of the removal of the underlying interface as - * well. We differentiate these two cases: in case of destruction - * of the underlying interface, we do not cleanup our multicast - * memberships, since they are already freed. But we purge pointers - * to multicast structures, since they are no longer valid, to - * avoid panic in future calls to carpdetach(). Also, we do not - * release the lock on return, because the function will be - * called once more, for another CARP instance on the same - * interface. - */ -static void -carpdetach(struct carp_softc *sc, int unlock) -{ - struct carp_if *cif; - - callout_stop(&sc->sc_ad_tmo); - callout_stop(&sc->sc_md_tmo); - callout_stop(&sc->sc_md6_tmo); - - if (sc->sc_suppress) - carp_suppress_preempt--; - sc->sc_suppress = 0; - - if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) - carp_suppress_preempt--; - sc->sc_sendad_errors = 0; - - carp_set_state(sc, INIT); - SC2IFP(sc)->if_flags &= ~IFF_UP; - carp_setrun(sc, 0); -#ifdef INET - carp_multicast_cleanup(sc, unlock); -#endif -#ifdef INET6 - carp_multicast6_cleanup(sc, unlock); -#endif - - if (sc->sc_carpdev != NULL) { - cif = (struct carp_if *)sc->sc_carpdev->if_carp; - CARP_LOCK_ASSERT(cif); - TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list); - if (!--cif->vhif_nvrs) { - ifpromisc(sc->sc_carpdev, 0); - sc->sc_carpdev->if_carp = NULL; - CARP_LOCK_DESTROY(cif); - free(cif, M_CARP); - } else if (unlock) - CARP_UNLOCK(cif); - sc->sc_carpdev = NULL; - } -} - -/* Detach an interface from the carp. */ -static void -carp_ifdetach(void *arg __unused, struct ifnet *ifp) -{ - struct carp_if *cif = (struct carp_if *)ifp->if_carp; - struct carp_softc *sc, *nextsc; - - if (cif == NULL) - return; - - /* - * XXX: At the end of for() cycle the lock will be destroyed. - */ - CARP_LOCK(cif); - for (sc = TAILQ_FIRST(&cif->vhif_vrs); sc; sc = nextsc) { - nextsc = TAILQ_NEXT(sc, sc_list); - carpdetach(sc, 0); - } -} - /* * process input packet. * we have rearranged checks order compared to the rfc, * but it seems more efficient this way or not possible otherwise. */ #ifdef INET -void -carp_input(struct mbuf *m, int hlen) +int +carp_input(struct mbuf **mp, int *offp, int proto) { + struct mbuf *m = *mp; struct ip *ip = mtod(m, struct ip *); struct carp_header *ch; int iplen, len; - CARPSTATS_INC(carps_ipackets); + iplen = *offp; + *mp = NULL; - if (!carp_opts[CARPCTL_ALLOW]) { - m_freem(m); - return; - } + CARPSTATS_INC(carps_ipackets); - /* check if received on a valid carp interface */ - if (m->m_pkthdr.rcvif->if_carp == NULL) { - CARPSTATS_INC(carps_badif); - CARP_DEBUG("carp_input: packet received on non-carp " - "interface: %s\n", - m->m_pkthdr.rcvif->if_xname); + if (!V_carp_allow) { m_freem(m); - return; + return (IPPROTO_DONE); } /* verify that the IP TTL is 255. */ if (ip->ip_ttl != CARP_DFLTTL) { CARPSTATS_INC(carps_badttl); - CARP_DEBUG("carp_input: received ttl %d != 255 on %s\n", + CARP_DEBUG("%s: received ttl %d != 255 on %s\n", __func__, ip->ip_ttl, m->m_pkthdr.rcvif->if_xname); m_freem(m); - return; + return (IPPROTO_DONE); } iplen = ip->ip_hl << 2; if (m->m_pkthdr.len < iplen + sizeof(*ch)) { CARPSTATS_INC(carps_badlen); - CARP_DEBUG("carp_input: received len %zd < " - "sizeof(struct carp_header) on %s\n", - m->m_len - sizeof(struct ip), + CARP_DEBUG("%s: received len %zd < sizeof(struct carp_header) " + "on %s\n", __func__, m->m_len - sizeof(struct ip), m->m_pkthdr.rcvif->if_xname); m_freem(m); - return; + return (IPPROTO_DONE); } if (iplen + sizeof(*ch) < m->m_len) { if ((m = m_pullup(m, iplen + sizeof(*ch))) == NULL) { CARPSTATS_INC(carps_hdrops); - CARP_DEBUG("carp_input: pullup failed\n"); - return; + CARP_DEBUG("%s: pullup failed\n", __func__); + return (IPPROTO_DONE); } ip = mtod(m, struct ip *); } @@ -627,32 +493,33 @@ carp_input(struct mbuf *m, int hlen) len = iplen + sizeof(*ch); if (len > m->m_pkthdr.len) { CARPSTATS_INC(carps_badlen); - CARP_DEBUG("carp_input: packet too short %d on %s\n", + CARP_DEBUG("%s: packet too short %d on %s\n", __func__, m->m_pkthdr.len, m->m_pkthdr.rcvif->if_xname); m_freem(m); - return; + return (IPPROTO_DONE); } if ((m = m_pullup(m, len)) == NULL) { CARPSTATS_INC(carps_hdrops); - return; + return (IPPROTO_DONE); } ip = mtod(m, struct ip *); ch = (struct carp_header *)((char *)ip + iplen); /* verify the CARP checksum */ m->m_data += iplen; - if (carp_cksum(m, len - iplen)) { + if (in_cksum(m, len - iplen)) { CARPSTATS_INC(carps_badsum); - CARP_DEBUG("carp_input: checksum failed on %s\n", + CARP_DEBUG("%s: checksum failed on %s\n", __func__, m->m_pkthdr.rcvif->if_xname); m_freem(m); - return; + return (IPPROTO_DONE); } m->m_data -= iplen; carp_input_c(m, ch, AF_INET); + return (IPPROTO_DONE); } #endif @@ -667,7 +534,7 @@ carp6_input(struct mbuf **mp, int *offp, int proto) CARPSTATS_INC(carps_ipackets6); - if (!carp_opts[CARPCTL_ALLOW]) { + if (!V_carp_allow) { m_freem(m); return (IPPROTO_DONE); } @@ -675,9 +542,8 @@ carp6_input(struct mbuf **mp, int *offp, int proto) /* check if received on a valid carp interface */ if (m->m_pkthdr.rcvif->if_carp == NULL) { CARPSTATS_INC(carps_badif); - CARP_DEBUG("carp6_input: packet received on non-carp " - "interface: %s\n", - m->m_pkthdr.rcvif->if_xname); + CARP_DEBUG("%s: packet received on non-carp interface: %s\n", + __func__, m->m_pkthdr.rcvif->if_xname); m_freem(m); return (IPPROTO_DONE); } @@ -685,9 +551,8 @@ carp6_input(struct mbuf **mp, int *offp, int proto) /* verify that the IP TTL is 255 */ if (ip6->ip6_hlim != CARP_DFLTTL) { CARPSTATS_INC(carps_badttl); - CARP_DEBUG("carp6_input: received ttl %d != 255 on %s\n", - ip6->ip6_hlim, - m->m_pkthdr.rcvif->if_xname); + CARP_DEBUG("%s: received ttl %d != 255 on %s\n", __func__, + ip6->ip6_hlim, m->m_pkthdr.rcvif->if_xname); m_freem(m); return (IPPROTO_DONE); } @@ -697,16 +562,16 @@ carp6_input(struct mbuf **mp, int *offp, int proto) IP6_EXTHDR_GET(ch, struct carp_header *, m, *offp, sizeof(*ch)); if (ch == NULL) { CARPSTATS_INC(carps_badlen); - CARP_DEBUG("carp6_input: packet size %u too small\n", len); + CARP_DEBUG("%s: packet size %u too small\n", __func__, len); return (IPPROTO_DONE); } /* verify the CARP checksum */ m->m_data += *offp; - if (carp_cksum(m, sizeof(*ch))) { + if (in_cksum(m, sizeof(*ch))) { CARPSTATS_INC(carps_badsum); - CARP_DEBUG("carp6_input: checksum failed, on %s\n", + CARP_DEBUG("%s: checksum failed, on %s\n", __func__, m->m_pkthdr.rcvif->if_xname); m_freem(m); return (IPPROTO_DONE); @@ -722,62 +587,46 @@ static void carp_input_c(struct mbuf *m, struct carp_header *ch, sa_family_t af) { struct ifnet *ifp = m->m_pkthdr.rcvif; + struct ifaddr *ifa; struct carp_softc *sc; - u_int64_t tmp_counter; + uint64_t tmp_counter; struct timeval sc_tv, ch_tv; /* verify that the VHID is valid on the receiving interface */ - CARP_LOCK(ifp->if_carp); - TAILQ_FOREACH(sc, &((struct carp_if *)ifp->if_carp)->vhif_vrs, sc_list) - if (sc->sc_vhid == ch->carp_vhid) + IF_ADDR_RLOCK(ifp); + IFNET_FOREACH_IFA(ifp, ifa) + if (ifa->ifa_addr->sa_family == af && + ifa->ifa_carp->sc_vhid == ch->carp_vhid) { + ifa_ref(ifa); break; + } + IF_ADDR_RUNLOCK(ifp); - if (!sc || !((SC2IFP(sc)->if_flags & IFF_UP) && - (SC2IFP(sc)->if_drv_flags & IFF_DRV_RUNNING))) { + if (ifa == NULL) { CARPSTATS_INC(carps_badvhid); - CARP_UNLOCK(ifp->if_carp); m_freem(m); return; } - getmicrotime(&SC2IFP(sc)->if_lastchange); - SC2IFP(sc)->if_ipackets++; - SC2IFP(sc)->if_ibytes += m->m_pkthdr.len; - - if (bpf_peers_present(SC2IFP(sc)->if_bpf)) { - uint32_t af1 = af; -#ifdef INET - struct ip *ip = mtod(m, struct ip *); - - /* BPF wants net byte order */ - if (af == AF_INET) { - ip->ip_len = htons(ip->ip_len + (ip->ip_hl << 2)); - ip->ip_off = htons(ip->ip_off); - } -#endif - bpf_mtap2(SC2IFP(sc)->if_bpf, &af1, sizeof(af1), m); - } - /* verify the CARP version. */ if (ch->carp_version != CARP_VERSION) { CARPSTATS_INC(carps_badver); - SC2IFP(sc)->if_ierrors++; - CARP_UNLOCK(ifp->if_carp); - CARP_DEBUG("%s; invalid version %d\n", - SC2IFP(sc)->if_xname, + CARP_DEBUG("%s: invalid version %d\n", ifp->if_xname, ch->carp_version); + ifa_free(ifa); m_freem(m); return; } - /* verify the hash */ + sc = ifa->ifa_carp; + CARP_LOCK(sc); + ifa_free(ifa); + if (carp_hmac_verify(sc, ch->carp_counter, ch->carp_md)) { CARPSTATS_INC(carps_badauth); - SC2IFP(sc)->if_ierrors++; - CARP_UNLOCK(ifp->if_carp); - CARP_DEBUG("%s: incorrect hash\n", SC2IFP(sc)->if_xname); - m_freem(m); - return; + CARP_DEBUG("%s: incorrect hash for VHID %u@%s\n", __func__, + sc->sc_vhid, ifp->if_xname); + goto out; } tmp_counter = ntohl(ch->carp_counter[0]); @@ -790,10 +639,7 @@ carp_input_c(struct mbuf *m, struct carp_header *ch, sa_family_t af) sc->sc_counter = tmp_counter; sc_tv.tv_sec = sc->sc_advbase; - if (carp_suppress_preempt && sc->sc_advskew < 240) - sc_tv.tv_usec = 240 * 1000000 / 256; - else - sc_tv.tv_usec = sc->sc_advskew * 1000000 / 256; + sc_tv.tv_usec = DEMOTE_ADVSKEW(sc) * 1000000 / 256; ch_tv.tv_sec = ch->carp_advbase; ch_tv.tv_usec = ch->carp_advskew * 1000000 / 256; @@ -808,12 +654,10 @@ carp_input_c(struct mbuf *m, struct carp_header *ch, sa_family_t af) if (timevalcmp(&sc_tv, &ch_tv, >) || timevalcmp(&sc_tv, &ch_tv, ==)) { callout_stop(&sc->sc_ad_tmo); - CARP_LOG("%s: MASTER -> BACKUP " - "(more frequent advertisement received)\n", - SC2IFP(sc)->if_xname); - carp_set_state(sc, BACKUP); + carp_set_state(sc, BACKUP, + "more frequent advertisement received"); carp_setrun(sc, 0); - carp_setroute(sc, RTM_DELETE); + carp_delroute(sc); } break; case BACKUP: @@ -821,12 +665,9 @@ carp_input_c(struct mbuf *m, struct carp_header *ch, sa_family_t af) * If we're pre-empting masters who advertise slower than us, * and this one claims to be slower, treat him as down. */ - if (carp_opts[CARPCTL_PREEMPT] && - timevalcmp(&sc_tv, &ch_tv, <)) { - CARP_LOG("%s: BACKUP -> MASTER " - "(preempting a slower master)\n", - SC2IFP(sc)->if_xname); - carp_master_down_locked(sc); + if (V_carp_preempt && timevalcmp(&sc_tv, &ch_tv, <)) { + carp_master_down_locked(sc, + "preempting a slower master"); break; } @@ -837,10 +678,7 @@ carp_input_c(struct mbuf *m, struct carp_header *ch, sa_family_t af) */ sc_tv.tv_sec = sc->sc_advbase * 3; if (timevalcmp(&sc_tv, &ch_tv, <)) { - CARP_LOG("%s: BACKUP -> MASTER " - "(master timed out)\n", - SC2IFP(sc)->if_xname); - carp_master_down_locked(sc); + carp_master_down_locked(sc, "master will time out"); break; } @@ -852,17 +690,15 @@ carp_input_c(struct mbuf *m, struct carp_header *ch, sa_family_t af) break; } - CARP_UNLOCK(ifp->if_carp); - +out: + CARP_UNLOCK(sc); m_freem(m); - return; } static int carp_prepare_ad(struct mbuf *m, struct carp_softc *sc, struct carp_header *ch) { struct m_tag *mtag; - struct ifnet *ifp = SC2IFP(sc); if (sc->sc_init_counter) { /* this could also be seconds since unix epoch */ @@ -878,45 +714,79 @@ carp_prepare_ad(struct mbuf *m, struct carp_softc *sc, struct carp_header *ch) carp_hmac_generate(sc, ch->carp_counter, ch->carp_md); /* Tag packet for carp_output */ - mtag = m_tag_get(PACKET_TAG_CARP, sizeof(struct ifnet *), M_NOWAIT); - if (mtag == NULL) { + if ((mtag = m_tag_get(PACKET_TAG_CARP, sizeof(struct carp_softc *), + M_NOWAIT)) == NULL) { m_freem(m); - SC2IFP(sc)->if_oerrors++; + CARPSTATS_INC(carps_onomem); return (ENOMEM); } - bcopy(&ifp, (caddr_t)(mtag + 1), sizeof(struct ifnet *)); + bcopy(&sc, mtag + 1, sizeof(sc)); m_tag_prepend(m, mtag); return (0); } +/* + * To avoid LORs and possible recursions this function shouldn't + * be called directly, but scheduled via taskqueue. + */ static void -carp_send_ad_all(void) +carp_send_ad_all(void *ctx __unused, int pending __unused) { struct carp_softc *sc; mtx_lock(&carp_mtx); - LIST_FOREACH(sc, &carpif_list, sc_next) { - if (sc->sc_carpdev == NULL) - continue; - CARP_SCLOCK(sc); - if ((SC2IFP(sc)->if_flags & IFF_UP) && - (SC2IFP(sc)->if_drv_flags & IFF_DRV_RUNNING) && - sc->sc_state == MASTER) + LIST_FOREACH(sc, &carp_list, sc_next) + if (sc->sc_state == MASTER) { + CARP_LOCK(sc); + CURVNET_SET(sc->sc_carpdev->if_vnet); carp_send_ad_locked(sc); - CARP_SCUNLOCK(sc); - } + CURVNET_RESTORE(); + CARP_UNLOCK(sc); + } mtx_unlock(&carp_mtx); } +/* Send a periodic advertisement, executed in callout context. */ static void carp_send_ad(void *v) { struct carp_softc *sc = v; - CARP_SCLOCK(sc); + CARP_LOCK_ASSERT(sc); + CURVNET_SET(sc->sc_carpdev->if_vnet); carp_send_ad_locked(sc); - CARP_SCUNLOCK(sc); + CURVNET_RESTORE(); + CARP_UNLOCK(sc); +} + +static void +carp_send_ad_error(struct carp_softc *sc, int error) +{ + + if (error) { + if (sc->sc_sendad_errors < INT_MAX) + sc->sc_sendad_errors++; + if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS) { + static const char fmt[] = "send error %d on %s"; + char msg[sizeof(fmt) + IFNAMSIZ]; + + sprintf(msg, fmt, error, sc->sc_carpdev->if_xname); + carp_demote_adj(V_carp_senderr_adj, msg); + } + sc->sc_sendad_success = 0; + } else { + if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS && + ++sc->sc_sendad_success >= CARP_SENDAD_MIN_SUCCESS) { + static const char fmt[] = "send ok on %s"; + char msg[sizeof(fmt) + IFNAMSIZ]; + + sprintf(msg, fmt, sc->sc_carpdev->if_xname); + carp_demote_adj(-V_carp_senderr_adj, msg); + sc->sc_sendad_errors = 0; + } else + sc->sc_sendad_errors = 0; + } } static void @@ -924,190 +794,211 @@ carp_send_ad_locked(struct carp_softc *sc) { struct carp_header ch; struct timeval tv; + struct sockaddr sa; + struct ifaddr *ifa; struct carp_header *ch_ptr; struct mbuf *m; - int len, advbase, advskew; + int len, advskew; - CARP_SCLOCK_ASSERT(sc); + CARP_LOCK_ASSERT(sc); - /* bow out if we've lost our UPness or RUNNINGuiness */ - if (!((SC2IFP(sc)->if_flags & IFF_UP) && - (SC2IFP(sc)->if_drv_flags & IFF_DRV_RUNNING))) { - advbase = 255; - advskew = 255; - } else { - advbase = sc->sc_advbase; - if (!carp_suppress_preempt || sc->sc_advskew > 240) - advskew = sc->sc_advskew; - else - advskew = 240; - tv.tv_sec = advbase; - tv.tv_usec = advskew * 1000000 / 256; - } + advskew = DEMOTE_ADVSKEW(sc); + tv.tv_sec = sc->sc_advbase; + tv.tv_usec = advskew * 1000000 / 256; ch.carp_version = CARP_VERSION; ch.carp_type = CARP_ADVERTISEMENT; ch.carp_vhid = sc->sc_vhid; - ch.carp_advbase = advbase; + ch.carp_advbase = sc->sc_advbase; ch.carp_advskew = advskew; ch.carp_authlen = 7; /* XXX DEFINE */ ch.carp_pad1 = 0; /* must be zero */ ch.carp_cksum = 0; + /* XXXGL: OpenBSD picks first ifaddr with needed family. */ + #ifdef INET - if (sc->sc_ia) { + if (sc->sc_naddrs) { struct ip *ip; - MGETHDR(m, M_DONTWAIT, MT_HEADER); + m = m_gethdr(M_NOWAIT, MT_DATA); if (m == NULL) { - SC2IFP(sc)->if_oerrors++; CARPSTATS_INC(carps_onomem); - /* XXX maybe less ? */ - if (advbase != 255 || advskew != 255) - callout_reset(&sc->sc_ad_tmo, tvtohz(&tv), - carp_send_ad, sc); - return; + goto resched; } len = sizeof(*ip) + sizeof(ch); m->m_pkthdr.len = len; m->m_pkthdr.rcvif = NULL; m->m_len = len; - MH_ALIGN(m, m->m_len); + M_ALIGN(m, m->m_len); m->m_flags |= M_MCAST; ip = mtod(m, struct ip *); ip->ip_v = IPVERSION; ip->ip_hl = sizeof(*ip) >> 2; ip->ip_tos = IPTOS_LOWDELAY; - ip->ip_len = len; - ip->ip_id = ip_newid(); - ip->ip_off = IP_DF; + ip->ip_len = htons(len); + ip->ip_off = htons(IP_DF); ip->ip_ttl = CARP_DFLTTL; ip->ip_p = IPPROTO_CARP; ip->ip_sum = 0; - ip->ip_src.s_addr = sc->sc_ia->ia_addr.sin_addr.s_addr; + ip_fillid(ip); + + bzero(&sa, sizeof(sa)); + sa.sa_family = AF_INET; + ifa = ifaof_ifpforaddr(&sa, sc->sc_carpdev); + if (ifa != NULL) { + ip->ip_src.s_addr = + ifatoia(ifa)->ia_addr.sin_addr.s_addr; + ifa_free(ifa); + } else + ip->ip_src.s_addr = 0; ip->ip_dst.s_addr = htonl(INADDR_CARP_GROUP); ch_ptr = (struct carp_header *)(&ip[1]); bcopy(&ch, ch_ptr, sizeof(ch)); if (carp_prepare_ad(m, sc, ch_ptr)) - return; + goto resched; m->m_data += sizeof(*ip); - ch_ptr->carp_cksum = carp_cksum(m, len - sizeof(*ip)); + ch_ptr->carp_cksum = in_cksum(m, len - sizeof(*ip)); m->m_data -= sizeof(*ip); - getmicrotime(&SC2IFP(sc)->if_lastchange); - SC2IFP(sc)->if_opackets++; - SC2IFP(sc)->if_obytes += len; CARPSTATS_INC(carps_opackets); - if (ip_output(m, NULL, NULL, IP_RAWOUTPUT, &sc->sc_imo, NULL)) { - SC2IFP(sc)->if_oerrors++; - if (sc->sc_sendad_errors < INT_MAX) - sc->sc_sendad_errors++; - if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS) { - carp_suppress_preempt++; - if (carp_suppress_preempt == 1) { - CARP_SCUNLOCK(sc); - carp_send_ad_all(); - CARP_SCLOCK(sc); - } - } - sc->sc_sendad_success = 0; - } else { - if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) { - if (++sc->sc_sendad_success >= - CARP_SENDAD_MIN_SUCCESS) { - carp_suppress_preempt--; - sc->sc_sendad_errors = 0; - } - } else - sc->sc_sendad_errors = 0; - } + carp_send_ad_error(sc, ip_output(m, NULL, NULL, IP_RAWOUTPUT, + &sc->sc_carpdev->if_carp->cif_imo, NULL)); } #endif /* INET */ #ifdef INET6 - if (sc->sc_ia6) { + if (sc->sc_naddrs6) { struct ip6_hdr *ip6; - MGETHDR(m, M_DONTWAIT, MT_HEADER); + m = m_gethdr(M_NOWAIT, MT_DATA); if (m == NULL) { - SC2IFP(sc)->if_oerrors++; CARPSTATS_INC(carps_onomem); - /* XXX maybe less ? */ - if (advbase != 255 || advskew != 255) - callout_reset(&sc->sc_ad_tmo, tvtohz(&tv), - carp_send_ad, sc); - return; + goto resched; } len = sizeof(*ip6) + sizeof(ch); m->m_pkthdr.len = len; m->m_pkthdr.rcvif = NULL; m->m_len = len; - MH_ALIGN(m, m->m_len); + M_ALIGN(m, m->m_len); m->m_flags |= M_MCAST; ip6 = mtod(m, struct ip6_hdr *); bzero(ip6, sizeof(*ip6)); ip6->ip6_vfc |= IPV6_VERSION; ip6->ip6_hlim = CARP_DFLTTL; ip6->ip6_nxt = IPPROTO_CARP; - bcopy(&sc->sc_ia6->ia_addr.sin6_addr, &ip6->ip6_src, - sizeof(struct in6_addr)); - /* set the multicast destination */ + bzero(&sa, sizeof(sa)); + + /* set the source address */ + sa.sa_family = AF_INET6; + ifa = ifaof_ifpforaddr(&sa, sc->sc_carpdev); + if (ifa != NULL) { + bcopy(IFA_IN6(ifa), &ip6->ip6_src, + sizeof(struct in6_addr)); + ifa_free(ifa); + } else + /* This should never happen with IPv6. */ + bzero(&ip6->ip6_src, sizeof(struct in6_addr)); + /* Set the multicast destination. */ ip6->ip6_dst.s6_addr16[0] = htons(0xff02); ip6->ip6_dst.s6_addr8[15] = 0x12; if (in6_setscope(&ip6->ip6_dst, sc->sc_carpdev, NULL) != 0) { - SC2IFP(sc)->if_oerrors++; m_freem(m); CARP_DEBUG("%s: in6_setscope failed\n", __func__); - return; + goto resched; } ch_ptr = (struct carp_header *)(&ip6[1]); bcopy(&ch, ch_ptr, sizeof(ch)); if (carp_prepare_ad(m, sc, ch_ptr)) - return; + goto resched; m->m_data += sizeof(*ip6); - ch_ptr->carp_cksum = carp_cksum(m, len - sizeof(*ip6)); + ch_ptr->carp_cksum = in_cksum(m, len - sizeof(*ip6)); m->m_data -= sizeof(*ip6); - getmicrotime(&SC2IFP(sc)->if_lastchange); - SC2IFP(sc)->if_opackets++; - SC2IFP(sc)->if_obytes += len; CARPSTATS_INC(carps_opackets6); - if (ip6_output(m, NULL, NULL, 0, &sc->sc_im6o, NULL, NULL)) { - SC2IFP(sc)->if_oerrors++; - if (sc->sc_sendad_errors < INT_MAX) - sc->sc_sendad_errors++; - if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS) { - carp_suppress_preempt++; - if (carp_suppress_preempt == 1) { - CARP_SCUNLOCK(sc); - carp_send_ad_all(); - CARP_SCLOCK(sc); - } - } - sc->sc_sendad_success = 0; - } else { - if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) { - if (++sc->sc_sendad_success >= - CARP_SENDAD_MIN_SUCCESS) { - carp_suppress_preempt--; - sc->sc_sendad_errors = 0; - } - } else - sc->sc_sendad_errors = 0; - } + carp_send_ad_error(sc, ip6_output(m, NULL, NULL, 0, + &sc->sc_carpdev->if_carp->cif_im6o, NULL, NULL)); } #endif /* INET6 */ - if (advbase != 255 || advskew != 255) - callout_reset(&sc->sc_ad_tmo, tvtohz(&tv), - carp_send_ad, sc); +resched: + callout_reset(&sc->sc_ad_tmo, tvtohz(&tv), carp_send_ad, sc); +} + +static void +carp_addroute(struct carp_softc *sc) +{ + struct ifaddr *ifa; + + CARP_FOREACH_IFA(sc, ifa) + carp_ifa_addroute(ifa); +} + +static void +carp_ifa_addroute(struct ifaddr *ifa) +{ + + switch (ifa->ifa_addr->sa_family) { +#ifdef INET + case AF_INET: + in_addprefix(ifatoia(ifa), RTF_UP); + ifa_add_loopback_route(ifa, + (struct sockaddr *)&ifatoia(ifa)->ia_addr); + break; +#endif +#ifdef INET6 + case AF_INET6: + ifa_add_loopback_route(ifa, + (struct sockaddr *)&ifatoia6(ifa)->ia_addr); + nd6_add_ifa_lle(ifatoia6(ifa)); + break; +#endif + } +} +static void +carp_delroute(struct carp_softc *sc) +{ + struct ifaddr *ifa; + + CARP_FOREACH_IFA(sc, ifa) + carp_ifa_delroute(ifa); +} + +static void +carp_ifa_delroute(struct ifaddr *ifa) +{ + + switch (ifa->ifa_addr->sa_family) { +#ifdef INET + case AF_INET: + ifa_del_loopback_route(ifa, + (struct sockaddr *)&ifatoia(ifa)->ia_addr); + in_scrubprefix(ifatoia(ifa), LLE_STATIC); + break; +#endif +#ifdef INET6 + case AF_INET6: + ifa_del_loopback_route(ifa, + (struct sockaddr *)&ifatoia6(ifa)->ia_addr); + nd6_rem_ifa_lle(ifatoia6(ifa), 1); + break; +#endif + } +} + +int +carp_master(struct ifaddr *ifa) +{ + struct carp_softc *sc = ifa->ifa_carp; + + return (sc->sc_state == MASTER); } #ifdef INET @@ -1120,17 +1011,27 @@ static void carp_send_arp(struct carp_softc *sc) { struct ifaddr *ifa; + struct in_addr addr; - TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) { - + CARP_FOREACH_IFA(sc, ifa) { if (ifa->ifa_addr->sa_family != AF_INET) continue; + addr = ((struct sockaddr_in *)ifa->ifa_addr)->sin_addr; + arp_announce_ifaddr(sc->sc_carpdev, addr, LLADDR(&sc->sc_addr)); + } +} -/* arprequest(sc->sc_carpdev, &in, &in, IF_LLADDR(sc->sc_ifp)); */ - arp_ifinit2(sc->sc_carpdev, ifa, IF_LLADDR(sc->sc_ifp)); +int +carp_iamatch(struct ifaddr *ifa, uint8_t **enaddr) +{ + struct carp_softc *sc = ifa->ifa_carp; - DELAY(1000); /* XXX */ + if (sc->sc_state == MASTER) { + *enaddr = LLADDR(&sc->sc_addr); + return (1); } + + return (0); } #endif @@ -1138,262 +1039,148 @@ carp_send_arp(struct carp_softc *sc) static void carp_send_na(struct carp_softc *sc) { + static struct in6_addr mcast = IN6ADDR_LINKLOCAL_ALLNODES_INIT; struct ifaddr *ifa; struct in6_addr *in6; - static struct in6_addr mcast = IN6ADDR_LINKLOCAL_ALLNODES_INIT; - - TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) { + CARP_FOREACH_IFA(sc, ifa) { if (ifa->ifa_addr->sa_family != AF_INET6) continue; - in6 = &ifatoia6(ifa)->ia_addr.sin6_addr; + in6 = IFA_IN6(ifa); nd6_na_output(sc->sc_carpdev, &mcast, in6, ND_NA_FLAG_OVERRIDE, 1, NULL); DELAY(1000); /* XXX */ } } -#endif /* INET6 */ - -#ifdef INET -static int -carp_addrcount(struct carp_if *cif, struct in_ifaddr *ia, int type) -{ - struct carp_softc *vh; - struct ifaddr *ifa; - int count = 0; - - CARP_LOCK_ASSERT(cif); - - TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) { - if ((type == CARP_COUNT_RUNNING && - (SC2IFP(vh)->if_flags & IFF_UP) && - (SC2IFP(vh)->if_drv_flags & IFF_DRV_RUNNING)) || - (type == CARP_COUNT_MASTER && vh->sc_state == MASTER)) { - IF_ADDR_RLOCK(SC2IFP(vh)); - TAILQ_FOREACH(ifa, &SC2IFP(vh)->if_addrlist, - ifa_list) { - if (ifa->ifa_addr->sa_family == AF_INET && - ia->ia_addr.sin_addr.s_addr == - ifatoia(ifa)->ia_addr.sin_addr.s_addr) - count++; - } - IF_ADDR_RUNLOCK(SC2IFP(vh)); - } - } - return (count); -} - -int -carp_iamatch(struct ifnet *ifp, struct in_ifaddr *ia, - struct in_addr *isaddr, u_int8_t **enaddr) -{ - struct carp_if *cif; - struct carp_softc *vh; - int index, count = 0; - struct ifaddr *ifa; - - cif = ifp->if_carp; - CARP_LOCK(cif); - - if (carp_opts[CARPCTL_ARPBALANCE]) { - /* - * XXX proof of concept implementation. - * We use the source ip to decide which virtual host should - * handle the request. If we're master of that virtual host, - * then we respond, otherwise, just drop the arp packet on - * the floor. - */ - count = carp_addrcount(cif, ia, CARP_COUNT_RUNNING); - if (count == 0) { - /* should never reach this */ - CARP_UNLOCK(cif); - return (0); - } - - /* this should be a hash, like pf_hash() */ - index = ntohl(isaddr->s_addr) % count; - count = 0; - - TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) { - if ((SC2IFP(vh)->if_flags & IFF_UP) && - (SC2IFP(vh)->if_drv_flags & IFF_DRV_RUNNING)) { - IF_ADDR_RLOCK(SC2IFP(vh)); - TAILQ_FOREACH(ifa, &SC2IFP(vh)->if_addrlist, - ifa_list) { - if (ifa->ifa_addr->sa_family == - AF_INET && - ia->ia_addr.sin_addr.s_addr == - ifatoia(ifa)->ia_addr.sin_addr.s_addr) { - if (count == index) { - if (vh->sc_state == - MASTER) { - *enaddr = IF_LLADDR(vh->sc_ifp); - IF_ADDR_RUNLOCK(SC2IFP(vh)); - CARP_UNLOCK(cif); - return (1); - } else { - IF_ADDR_RUNLOCK(SC2IFP(vh)); - CARP_UNLOCK(cif); - return (0); - } - } - count++; - } - } - IF_ADDR_RUNLOCK(SC2IFP(vh)); - } - } - } else { - TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) { - if ((SC2IFP(vh)->if_flags & IFF_UP) && - (SC2IFP(vh)->if_drv_flags & IFF_DRV_RUNNING) && - ia->ia_ifp == SC2IFP(vh) && - vh->sc_state == MASTER) { - *enaddr = IF_LLADDR(vh->sc_ifp); - CARP_UNLOCK(cif); - return (1); - } - } - } - CARP_UNLOCK(cif); - return (0); -} -#endif -#ifdef INET6 +/* + * Returns ifa in case it's a carp address and it is MASTER, or if the address + * matches and is not a carp address. Returns NULL otherwise. + */ struct ifaddr * carp_iamatch6(struct ifnet *ifp, struct in6_addr *taddr) { - struct carp_if *cif; - struct carp_softc *vh; struct ifaddr *ifa; - cif = ifp->if_carp; - CARP_LOCK(cif); - TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) { - IF_ADDR_RLOCK(SC2IFP(vh)); - TAILQ_FOREACH(ifa, &SC2IFP(vh)->if_addrlist, ifa_list) { - if (IN6_ARE_ADDR_EQUAL(taddr, - &ifatoia6(ifa)->ia_addr.sin6_addr) && - (SC2IFP(vh)->if_flags & IFF_UP) && - (SC2IFP(vh)->if_drv_flags & IFF_DRV_RUNNING) && - vh->sc_state == MASTER) { - ifa_ref(ifa); - IF_ADDR_RUNLOCK(SC2IFP(vh)); - CARP_UNLOCK(cif); - return (ifa); - } - } - IF_ADDR_RUNLOCK(SC2IFP(vh)); + ifa = NULL; + IF_ADDR_RLOCK(ifp); + TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { + if (ifa->ifa_addr->sa_family != AF_INET6) + continue; + if (!IN6_ARE_ADDR_EQUAL(taddr, IFA_IN6(ifa))) + continue; + if (ifa->ifa_carp && ifa->ifa_carp->sc_state != MASTER) + ifa = NULL; + else + ifa_ref(ifa); + break; } - CARP_UNLOCK(cif); - - return (NULL); + IF_ADDR_RUNLOCK(ifp); + + return (ifa); } caddr_t carp_macmatch6(struct ifnet *ifp, struct mbuf *m, const struct in6_addr *taddr) { - struct m_tag *mtag; - struct carp_if *cif; - struct carp_softc *sc; struct ifaddr *ifa; - cif = ifp->if_carp; - CARP_LOCK(cif); - TAILQ_FOREACH(sc, &cif->vhif_vrs, sc_list) { - IF_ADDR_RLOCK(SC2IFP(sc)); - TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) { - if (IN6_ARE_ADDR_EQUAL(taddr, - &ifatoia6(ifa)->ia_addr.sin6_addr) && - (SC2IFP(sc)->if_flags & IFF_UP) && - (SC2IFP(sc)->if_drv_flags & IFF_DRV_RUNNING)) { - struct ifnet *ifp = SC2IFP(sc); - mtag = m_tag_get(PACKET_TAG_CARP, - sizeof(struct ifnet *), M_NOWAIT); - if (mtag == NULL) { - /* better a bit than nothing */ - IF_ADDR_RUNLOCK(SC2IFP(sc)); - CARP_UNLOCK(cif); - return (IF_LLADDR(sc->sc_ifp)); - } - bcopy(&ifp, (caddr_t)(mtag + 1), - sizeof(struct ifnet *)); - m_tag_prepend(m, mtag); + IF_ADDR_RLOCK(ifp); + IFNET_FOREACH_IFA(ifp, ifa) + if (ifa->ifa_addr->sa_family == AF_INET6 && + IN6_ARE_ADDR_EQUAL(taddr, IFA_IN6(ifa))) { + struct carp_softc *sc = ifa->ifa_carp; + struct m_tag *mtag; - IF_ADDR_RUNLOCK(SC2IFP(sc)); - CARP_UNLOCK(cif); - return (IF_LLADDR(sc->sc_ifp)); - } + IF_ADDR_RUNLOCK(ifp); + + mtag = m_tag_get(PACKET_TAG_CARP, + sizeof(struct carp_softc *), M_NOWAIT); + if (mtag == NULL) + /* Better a bit than nothing. */ + return (LLADDR(&sc->sc_addr)); + + bcopy(&sc, mtag + 1, sizeof(sc)); + m_tag_prepend(m, mtag); + + return (LLADDR(&sc->sc_addr)); } - IF_ADDR_RUNLOCK(SC2IFP(sc)); - } - CARP_UNLOCK(cif); + IF_ADDR_RUNLOCK(ifp); return (NULL); } -#endif +#endif /* INET6 */ -struct ifnet * +int carp_forus(struct ifnet *ifp, u_char *dhost) { - struct carp_if *cif; - struct carp_softc *vh; - u_int8_t *ena = dhost; + struct carp_softc *sc; + uint8_t *ena = dhost; if (ena[0] || ena[1] || ena[2] != 0x5e || ena[3] || ena[4] != 1) - return (NULL); - - cif = ifp->if_carp; - CARP_LOCK(cif); - TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) - if ((SC2IFP(vh)->if_flags & IFF_UP) && - (SC2IFP(vh)->if_drv_flags & IFF_DRV_RUNNING) && - vh->sc_state == MASTER && - !bcmp(dhost, IF_LLADDR(vh->sc_ifp), ETHER_ADDR_LEN)) { - CARP_UNLOCK(cif); - return (SC2IFP(vh)); + return (0); + + CIF_LOCK(ifp->if_carp); + IFNET_FOREACH_CARP(ifp, sc) { + CARP_LOCK(sc); + if (sc->sc_state == MASTER && !bcmp(dhost, LLADDR(&sc->sc_addr), + ETHER_ADDR_LEN)) { + CARP_UNLOCK(sc); + CIF_UNLOCK(ifp->if_carp); + return (1); } + CARP_UNLOCK(sc); + } + CIF_UNLOCK(ifp->if_carp); - CARP_UNLOCK(cif); - return (NULL); + return (0); } +/* Master down timeout event, executed in callout context. */ static void carp_master_down(void *v) { struct carp_softc *sc = v; - CARP_SCLOCK(sc); - carp_master_down_locked(sc); - CARP_SCUNLOCK(sc); + CARP_LOCK_ASSERT(sc); + + CURVNET_SET(sc->sc_carpdev->if_vnet); + if (sc->sc_state == BACKUP) { + carp_master_down_locked(sc, "master timed out"); + } + CURVNET_RESTORE(); + + CARP_UNLOCK(sc); } static void -carp_master_down_locked(struct carp_softc *sc) +carp_master_down_locked(struct carp_softc *sc, const char *reason) { - if (sc->sc_carpdev) - CARP_SCLOCK_ASSERT(sc); + + CARP_LOCK_ASSERT(sc); switch (sc->sc_state) { - case INIT: - printf("%s: master_down event in INIT state\n", - SC2IFP(sc)->if_xname); - break; - case MASTER: - break; case BACKUP: - carp_set_state(sc, MASTER); + carp_set_state(sc, MASTER, reason); carp_send_ad_locked(sc); #ifdef INET carp_send_arp(sc); #endif #ifdef INET6 carp_send_na(sc); -#endif /* INET6 */ +#endif carp_setrun(sc, 0); - carp_setroute(sc, RTM_ADD); + carp_addroute(sc); + break; + case INIT: + case MASTER: +#ifdef INVARIANTS + panic("carp: VHID %u@%s: master_down event in %s state\n", + sc->sc_vhid, + sc->sc_carpdev->if_xname, + sc->sc_state ? "MASTER" : "INIT"); +#endif break; } } @@ -1407,28 +1194,16 @@ carp_setrun(struct carp_softc *sc, sa_family_t af) { struct timeval tv; - if (sc->sc_carpdev == NULL) { - SC2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING; - carp_set_state(sc, INIT); - return; - } else - CARP_SCLOCK_ASSERT(sc); - - if (SC2IFP(sc)->if_flags & IFF_UP && - sc->sc_vhid > 0 && (sc->sc_naddrs || sc->sc_naddrs6) && - sc->sc_carpdev->if_link_state == LINK_STATE_UP) - SC2IFP(sc)->if_drv_flags |= IFF_DRV_RUNNING; - else { - SC2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING; - carp_setroute(sc, RTM_DELETE); + CARP_LOCK_ASSERT(sc); + + if ((sc->sc_carpdev->if_flags & IFF_UP) == 0 || + sc->sc_carpdev->if_link_state != LINK_STATE_UP || + (sc->sc_naddrs == 0 && sc->sc_naddrs6 == 0)) return; - } switch (sc->sc_state) { case INIT: - CARP_LOG("%s: INIT -> BACKUP\n", SC2IFP(sc)->if_xname); - carp_set_state(sc, BACKUP); - carp_setroute(sc, RTM_DELETE); + carp_set_state(sc, BACKUP, "initialization complete"); carp_setrun(sc, 0); break; case BACKUP: @@ -1441,20 +1216,24 @@ carp_setrun(struct carp_softc *sc, sa_family_t af) callout_reset(&sc->sc_md_tmo, tvtohz(&tv), carp_master_down, sc); break; -#endif /* INET */ +#endif #ifdef INET6 case AF_INET6: callout_reset(&sc->sc_md6_tmo, tvtohz(&tv), carp_master_down, sc); break; -#endif /* INET6 */ +#endif default: +#ifdef INET if (sc->sc_naddrs) callout_reset(&sc->sc_md_tmo, tvtohz(&tv), carp_master_down, sc); +#endif +#ifdef INET6 if (sc->sc_naddrs6) callout_reset(&sc->sc_md6_tmo, tvtohz(&tv), carp_master_down, sc); +#endif break; } break; @@ -1467,842 +1246,779 @@ carp_setrun(struct carp_softc *sc, sa_family_t af) } } -#ifdef INET -static void -carp_multicast_cleanup(struct carp_softc *sc, int dofree) -{ - struct ip_moptions *imo = &sc->sc_imo; - u_int16_t n = imo->imo_num_memberships; - - /* Clean up our own multicast memberships */ - while (n-- > 0) { - if (imo->imo_membership[n] != NULL) { - if (dofree) - in_delmulti(imo->imo_membership[n]); - imo->imo_membership[n] = NULL; - } - } - KASSERT(imo->imo_mfilters == NULL, - ("%s: imo_mfilters != NULL", __func__)); - imo->imo_num_memberships = 0; - imo->imo_multicast_ifp = NULL; -} -#endif - -#ifdef INET6 -static void -carp_multicast6_cleanup(struct carp_softc *sc, int dofree) -{ - struct ip6_moptions *im6o = &sc->sc_im6o; - u_int16_t n = im6o->im6o_num_memberships; - - while (n-- > 0) { - if (im6o->im6o_membership[n] != NULL) { - if (dofree) - in6_mc_leave(im6o->im6o_membership[n], NULL); - im6o->im6o_membership[n] = NULL; - } - } - KASSERT(im6o->im6o_mfilters == NULL, - ("%s: im6o_mfilters != NULL", __func__)); - im6o->im6o_num_memberships = 0; - im6o->im6o_multicast_ifp = NULL; -} -#endif - -#ifdef INET +/* + * Setup multicast structures. + */ static int -carp_set_addr(struct carp_softc *sc, struct sockaddr_in *sin) +carp_multicast_setup(struct carp_if *cif, sa_family_t sa) { - struct ifnet *ifp; - struct carp_if *cif; - struct in_ifaddr *ia, *ia_if; - struct ip_moptions *imo = &sc->sc_imo; - struct in_addr addr; - u_long iaddr = htonl(sin->sin_addr.s_addr); - int own, error; - - if (sin->sin_addr.s_addr == 0) { - if (!(SC2IFP(sc)->if_flags & IFF_UP)) - carp_set_state(sc, INIT); - if (sc->sc_naddrs) - SC2IFP(sc)->if_flags |= IFF_UP; - if (sc->sc_carpdev) - CARP_SCLOCK(sc); - carp_setrun(sc, 0); - if (sc->sc_carpdev) - CARP_SCUNLOCK(sc); - return (0); - } - - /* we have to do it by hands to check we won't match on us */ - ia_if = NULL; own = 0; - IN_IFADDR_RLOCK(); - TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { - /* and, yeah, we need a multicast-capable iface too */ - if (ia->ia_ifp != SC2IFP(sc) && - (ia->ia_ifp->if_flags & IFF_MULTICAST) && - (iaddr & ia->ia_subnetmask) == ia->ia_subnet) { - if (!ia_if) - ia_if = ia; - if (sin->sin_addr.s_addr == - ia->ia_addr.sin_addr.s_addr) - own++; - } - } - - if (!ia_if) { - IN_IFADDR_RUNLOCK(); - return (EADDRNOTAVAIL); - } + struct ifnet *ifp = cif->cif_ifp; + int error = 0; - ia = ia_if; - ifa_ref(&ia->ia_ifa); - IN_IFADDR_RUNLOCK(); + switch (sa) { +#ifdef INET + case AF_INET: + { + struct ip_moptions *imo = &cif->cif_imo; + struct in_addr addr; - ifp = ia->ia_ifp; + if (imo->imo_membership) + return (0); - if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0 || - (imo->imo_multicast_ifp && imo->imo_multicast_ifp != ifp)) { - ifa_free(&ia->ia_ifa); - return (EADDRNOTAVAIL); - } + imo->imo_membership = (struct in_multi **)malloc( + (sizeof(struct in_multi *) * IP_MIN_MEMBERSHIPS), M_CARP, + M_WAITOK); + imo->imo_mfilters = NULL; + imo->imo_max_memberships = IP_MIN_MEMBERSHIPS; + imo->imo_multicast_vif = -1; - if (imo->imo_num_memberships == 0) { addr.s_addr = htonl(INADDR_CARP_GROUP); - if ((imo->imo_membership[0] = in_addmulti(&addr, ifp)) == - NULL) { - ifa_free(&ia->ia_ifa); - return (ENOBUFS); + if ((error = in_joingroup(ifp, &addr, NULL, + &imo->imo_membership[0])) != 0) { + free(imo->imo_membership, M_CARP); + break; } imo->imo_num_memberships++; imo->imo_multicast_ifp = ifp; imo->imo_multicast_ttl = CARP_DFLTTL; imo->imo_multicast_loop = 0; - } + break; + } +#endif +#ifdef INET6 + case AF_INET6: + { + struct ip6_moptions *im6o = &cif->cif_im6o; + struct in6_addr in6; + struct in6_multi *in6m; + + if (im6o->im6o_membership) + return (0); - if (!ifp->if_carp) { + im6o->im6o_membership = (struct in6_multi **)malloc( + (sizeof(struct in6_multi *) * IPV6_MIN_MEMBERSHIPS), M_CARP, + M_ZERO | M_WAITOK); + im6o->im6o_mfilters = NULL; + im6o->im6o_max_memberships = IPV6_MIN_MEMBERSHIPS; + im6o->im6o_multicast_hlim = CARP_DFLTTL; + im6o->im6o_multicast_ifp = ifp; - cif = malloc(sizeof(*cif), M_CARP, - M_WAITOK|M_ZERO); - if (!cif) { - error = ENOBUFS; - goto cleanup; + /* Join IPv6 CARP multicast group. */ + bzero(&in6, sizeof(in6)); + in6.s6_addr16[0] = htons(0xff02); + in6.s6_addr8[15] = 0x12; + if ((error = in6_setscope(&in6, ifp, NULL)) != 0) { + free(im6o->im6o_membership, M_CARP); + break; } - if ((error = ifpromisc(ifp, 1))) { - free(cif, M_CARP); - goto cleanup; + in6m = NULL; + if ((error = in6_mc_join(ifp, &in6, NULL, &in6m, 0)) != 0) { + free(im6o->im6o_membership, M_CARP); + break; } - - CARP_LOCK_INIT(cif); - CARP_LOCK(cif); - cif->vhif_ifp = ifp; - TAILQ_INIT(&cif->vhif_vrs); - ifp->if_carp = cif; + im6o->im6o_membership[0] = in6m; + im6o->im6o_num_memberships++; - } else { - struct carp_softc *vr; - - cif = (struct carp_if *)ifp->if_carp; - CARP_LOCK(cif); - TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) - if (vr != sc && vr->sc_vhid == sc->sc_vhid) { - CARP_UNLOCK(cif); - error = EEXIST; - goto cleanup; - } + /* Join solicited multicast address. */ + bzero(&in6, sizeof(in6)); + in6.s6_addr16[0] = htons(0xff02); + in6.s6_addr32[1] = 0; + in6.s6_addr32[2] = htonl(1); + in6.s6_addr32[3] = 0; + in6.s6_addr8[12] = 0xff; + if ((error = in6_setscope(&in6, ifp, NULL)) != 0) { + in6_mc_leave(im6o->im6o_membership[0], NULL); + free(im6o->im6o_membership, M_CARP); + break; + } + in6m = NULL; + if ((error = in6_mc_join(ifp, &in6, NULL, &in6m, 0)) != 0) { + in6_mc_leave(im6o->im6o_membership[0], NULL); + free(im6o->im6o_membership, M_CARP); + break; + } + im6o->im6o_membership[1] = in6m; + im6o->im6o_num_memberships++; + break; + } +#endif } - sc->sc_ia = ia; - sc->sc_carpdev = ifp; - { /* XXX prevent endless loop if already in queue */ - struct carp_softc *vr, *after = NULL; - int myself = 0; - cif = (struct carp_if *)ifp->if_carp; + return (error); +} - /* XXX: cif should not change, right? So we still hold the lock */ - CARP_LOCK_ASSERT(cif); +/* + * Free multicast structures. + */ +static void +carp_multicast_cleanup(struct carp_if *cif, sa_family_t sa) +{ - TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) { - if (vr == sc) - myself = 1; - if (vr->sc_vhid < sc->sc_vhid) - after = vr; - } + sx_assert(&carp_sx, SA_XLOCKED); + + switch (sa) { +#ifdef INET + case AF_INET: + if (cif->cif_naddrs == 0) { + struct ip_moptions *imo = &cif->cif_imo; + + in_leavegroup(imo->imo_membership[0], NULL); + KASSERT(imo->imo_mfilters == NULL, + ("%s: imo_mfilters != NULL", __func__)); + free(imo->imo_membership, M_CARP); + imo->imo_membership = NULL; - if (!myself) { - /* We're trying to keep things in order */ - if (after == NULL) { - TAILQ_INSERT_TAIL(&cif->vhif_vrs, sc, sc_list); - } else { - TAILQ_INSERT_AFTER(&cif->vhif_vrs, after, sc, sc_list); } - cif->vhif_nvrs++; - } + break; +#endif +#ifdef INET6 + case AF_INET6: + if (cif->cif_naddrs6 == 0) { + struct ip6_moptions *im6o = &cif->cif_im6o; + + in6_mc_leave(im6o->im6o_membership[0], NULL); + in6_mc_leave(im6o->im6o_membership[1], NULL); + KASSERT(im6o->im6o_mfilters == NULL, + ("%s: im6o_mfilters != NULL", __func__)); + free(im6o->im6o_membership, M_CARP); + im6o->im6o_membership = NULL; + } + break; +#endif } +} + +int +carp_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *sa) +{ + struct m_tag *mtag; + struct carp_softc *sc; - sc->sc_naddrs++; - SC2IFP(sc)->if_flags |= IFF_UP; - if (own) - sc->sc_advskew = 0; - carp_sc_state_locked(sc); - carp_setrun(sc, 0); + if (!sa) + return (0); - CARP_UNLOCK(cif); - ifa_free(&ia->ia_ifa); /* XXXRW: should hold reference for softc. */ + switch (sa->sa_family) { +#ifdef INET + case AF_INET: + break; +#endif +#ifdef INET6 + case AF_INET6: + break; +#endif + default: + return (0); + } - return (0); + mtag = m_tag_find(m, PACKET_TAG_CARP, NULL); + if (mtag == NULL) + return (0); -cleanup: - in_delmulti(imo->imo_membership[--imo->imo_num_memberships]); - ifa_free(&ia->ia_ifa); - return (error); -} + bcopy(mtag + 1, &sc, sizeof(sc)); -static int -carp_del_addr(struct carp_softc *sc, struct sockaddr_in *sin) -{ - int error = 0; + /* Set the source MAC address to the Virtual Router MAC Address. */ + switch (ifp->if_type) { + case IFT_ETHER: + case IFT_BRIDGE: + case IFT_L2VLAN: { + struct ether_header *eh; - if (!--sc->sc_naddrs) { - struct carp_if *cif = (struct carp_if *)sc->sc_carpdev->if_carp; - struct ip_moptions *imo = &sc->sc_imo; + eh = mtod(m, struct ether_header *); + eh->ether_shost[0] = 0; + eh->ether_shost[1] = 0; + eh->ether_shost[2] = 0x5e; + eh->ether_shost[3] = 0; + eh->ether_shost[4] = 1; + eh->ether_shost[5] = sc->sc_vhid; + } + break; + case IFT_FDDI: { + struct fddi_header *fh; - CARP_LOCK(cif); - callout_stop(&sc->sc_ad_tmo); - SC2IFP(sc)->if_flags &= ~IFF_UP; - SC2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING; - sc->sc_vhid = -1; - in_delmulti(imo->imo_membership[--imo->imo_num_memberships]); - imo->imo_multicast_ifp = NULL; - TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list); - if (!--cif->vhif_nvrs) { - sc->sc_carpdev->if_carp = NULL; - CARP_LOCK_DESTROY(cif); - free(cif, M_CARP); - } else { - CARP_UNLOCK(cif); + fh = mtod(m, struct fddi_header *); + fh->fddi_shost[0] = 0; + fh->fddi_shost[1] = 0; + fh->fddi_shost[2] = 0x5e; + fh->fddi_shost[3] = 0; + fh->fddi_shost[4] = 1; + fh->fddi_shost[5] = sc->sc_vhid; + } + break; + case IFT_ISO88025: { + struct iso88025_header *th; + th = mtod(m, struct iso88025_header *); + th->iso88025_shost[0] = 3; + th->iso88025_shost[1] = 0; + th->iso88025_shost[2] = 0x40 >> (sc->sc_vhid - 1); + th->iso88025_shost[3] = 0x40000 >> (sc->sc_vhid - 1); + th->iso88025_shost[4] = 0; + th->iso88025_shost[5] = 0; } + break; + default: + printf("%s: carp is not supported for the %d interface type\n", + ifp->if_xname, ifp->if_type); + return (EOPNOTSUPP); } - return (error); + return (0); } -#endif -#ifdef INET6 -static int -carp_set_addr6(struct carp_softc *sc, struct sockaddr_in6 *sin6) +static struct carp_softc* +carp_alloc(struct ifnet *ifp) { - struct ifnet *ifp; + struct carp_softc *sc; struct carp_if *cif; - struct in6_ifaddr *ia, *ia_if; - struct ip6_moptions *im6o = &sc->sc_im6o; - struct in6_addr in6; - int own, error; - - error = 0; - - if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { - if (!(SC2IFP(sc)->if_flags & IFF_UP)) - carp_set_state(sc, INIT); - if (sc->sc_naddrs6) - SC2IFP(sc)->if_flags |= IFF_UP; - if (sc->sc_carpdev) - CARP_SCLOCK(sc); - carp_setrun(sc, 0); - if (sc->sc_carpdev) - CARP_SCUNLOCK(sc); - return (0); - } - /* we have to do it by hands to check we won't match on us */ - ia_if = NULL; own = 0; - IN6_IFADDR_RLOCK(); - TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) { - int i; - - for (i = 0; i < 4; i++) { - if ((sin6->sin6_addr.s6_addr32[i] & - ia->ia_prefixmask.sin6_addr.s6_addr32[i]) != - (ia->ia_addr.sin6_addr.s6_addr32[i] & - ia->ia_prefixmask.sin6_addr.s6_addr32[i])) - break; - } - /* and, yeah, we need a multicast-capable iface too */ - if (ia->ia_ifp != SC2IFP(sc) && - (ia->ia_ifp->if_flags & IFF_MULTICAST) && - (i == 4)) { - if (!ia_if) - ia_if = ia; - if (IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, - &ia->ia_addr.sin6_addr)) - own++; - } - } + if ((cif = ifp->if_carp) == NULL) + cif = carp_alloc_if(ifp); - if (!ia_if) { - IN6_IFADDR_RUNLOCK(); - return (EADDRNOTAVAIL); - } - ia = ia_if; - ifa_ref(&ia->ia_ifa); - IN6_IFADDR_RUNLOCK(); - ifp = ia->ia_ifp; - - if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0 || - (im6o->im6o_multicast_ifp && im6o->im6o_multicast_ifp != ifp)) { - ifa_free(&ia->ia_ifa); - return (EADDRNOTAVAIL); - } + sc = malloc(sizeof(*sc), M_CARP, M_WAITOK|M_ZERO); - if (!sc->sc_naddrs6) { - struct in6_multi *in6m; + sc->sc_advbase = CARP_DFLTINTV; + sc->sc_vhid = -1; /* required setting */ + sc->sc_init_counter = 1; + sc->sc_state = INIT; - im6o->im6o_multicast_ifp = ifp; + sc->sc_ifasiz = sizeof(struct ifaddr *); + sc->sc_ifas = malloc(sc->sc_ifasiz, M_CARP, M_WAITOK|M_ZERO); + sc->sc_carpdev = ifp; - /* join CARP multicast address */ - bzero(&in6, sizeof(in6)); - in6.s6_addr16[0] = htons(0xff02); - in6.s6_addr8[15] = 0x12; - if (in6_setscope(&in6, ifp, NULL) != 0) - goto cleanup; - in6m = NULL; - error = in6_mc_join(ifp, &in6, NULL, &in6m, 0); - if (error) - goto cleanup; - im6o->im6o_membership[0] = in6m; - im6o->im6o_num_memberships++; + CARP_LOCK_INIT(sc); +#ifdef INET + callout_init_mtx(&sc->sc_md_tmo, &sc->sc_mtx, CALLOUT_RETURNUNLOCKED); +#endif +#ifdef INET6 + callout_init_mtx(&sc->sc_md6_tmo, &sc->sc_mtx, CALLOUT_RETURNUNLOCKED); +#endif + callout_init_mtx(&sc->sc_ad_tmo, &sc->sc_mtx, CALLOUT_RETURNUNLOCKED); - /* join solicited multicast address */ - bzero(&in6, sizeof(in6)); - in6.s6_addr16[0] = htons(0xff02); - in6.s6_addr32[1] = 0; - in6.s6_addr32[2] = htonl(1); - in6.s6_addr32[3] = sin6->sin6_addr.s6_addr32[3]; - in6.s6_addr8[12] = 0xff; - if (in6_setscope(&in6, ifp, NULL) != 0) - goto cleanup; - in6m = NULL; - error = in6_mc_join(ifp, &in6, NULL, &in6m, 0); - if (error) - goto cleanup; - im6o->im6o_membership[1] = in6m; - im6o->im6o_num_memberships++; - } + CIF_LOCK(cif); + TAILQ_INSERT_TAIL(&cif->cif_vrs, sc, sc_list); + CIF_UNLOCK(cif); - if (!ifp->if_carp) { - cif = malloc(sizeof(*cif), M_CARP, - M_WAITOK|M_ZERO); - if (!cif) { - error = ENOBUFS; - goto cleanup; - } - if ((error = ifpromisc(ifp, 1))) { - free(cif, M_CARP); - goto cleanup; - } + mtx_lock(&carp_mtx); + LIST_INSERT_HEAD(&carp_list, sc, sc_next); + mtx_unlock(&carp_mtx); - CARP_LOCK_INIT(cif); - CARP_LOCK(cif); - cif->vhif_ifp = ifp; - TAILQ_INIT(&cif->vhif_vrs); - ifp->if_carp = cif; + return (sc); +} - } else { - struct carp_softc *vr; +static void +carp_grow_ifas(struct carp_softc *sc) +{ + struct ifaddr **new; + + new = malloc(sc->sc_ifasiz * 2, M_CARP, M_WAITOK | M_ZERO); + CARP_LOCK(sc); + bcopy(sc->sc_ifas, new, sc->sc_ifasiz); + free(sc->sc_ifas, M_CARP); + sc->sc_ifas = new; + sc->sc_ifasiz *= 2; + CARP_UNLOCK(sc); +} - cif = (struct carp_if *)ifp->if_carp; - CARP_LOCK(cif); - TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) - if (vr != sc && vr->sc_vhid == sc->sc_vhid) { - CARP_UNLOCK(cif); - error = EINVAL; - goto cleanup; - } - } - sc->sc_ia6 = ia; - sc->sc_carpdev = ifp; +static void +carp_destroy(struct carp_softc *sc) +{ + struct ifnet *ifp = sc->sc_carpdev; + struct carp_if *cif = ifp->if_carp; - { /* XXX prevent endless loop if already in queue */ - struct carp_softc *vr, *after = NULL; - int myself = 0; - cif = (struct carp_if *)ifp->if_carp; - CARP_LOCK_ASSERT(cif); - - TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) { - if (vr == sc) - myself = 1; - if (vr->sc_vhid < sc->sc_vhid) - after = vr; - } + sx_assert(&carp_sx, SA_XLOCKED); - if (!myself) { - /* We're trying to keep things in order */ - if (after == NULL) { - TAILQ_INSERT_TAIL(&cif->vhif_vrs, sc, sc_list); - } else { - TAILQ_INSERT_AFTER(&cif->vhif_vrs, after, sc, sc_list); - } - cif->vhif_nvrs++; - } - } + if (sc->sc_suppress) + carp_demote_adj(-V_carp_ifdown_adj, "vhid removed"); + CARP_UNLOCK(sc); - sc->sc_naddrs6++; - SC2IFP(sc)->if_flags |= IFF_UP; - if (own) - sc->sc_advskew = 0; - carp_sc_state_locked(sc); - carp_setrun(sc, 0); + CIF_LOCK(cif); + TAILQ_REMOVE(&cif->cif_vrs, sc, sc_list); + CIF_UNLOCK(cif); - CARP_UNLOCK(cif); - ifa_free(&ia->ia_ifa); /* XXXRW: should hold reference for softc. */ + mtx_lock(&carp_mtx); + LIST_REMOVE(sc, sc_next); + mtx_unlock(&carp_mtx); - return (0); + callout_drain(&sc->sc_ad_tmo); +#ifdef INET + callout_drain(&sc->sc_md_tmo); +#endif +#ifdef INET6 + callout_drain(&sc->sc_md6_tmo); +#endif + CARP_LOCK_DESTROY(sc); -cleanup: - if (!sc->sc_naddrs6) - carp_multicast6_cleanup(sc, 1); - ifa_free(&ia->ia_ifa); - return (error); + free(sc->sc_ifas, M_CARP); + free(sc, M_CARP); } -static int -carp_del_addr6(struct carp_softc *sc, struct sockaddr_in6 *sin6) +static struct carp_if* +carp_alloc_if(struct ifnet *ifp) { - int error = 0; + struct carp_if *cif; + int error; - if (!--sc->sc_naddrs6) { - struct carp_if *cif = (struct carp_if *)sc->sc_carpdev->if_carp; + cif = malloc(sizeof(*cif), M_CARP, M_WAITOK|M_ZERO); - CARP_LOCK(cif); - callout_stop(&sc->sc_ad_tmo); - SC2IFP(sc)->if_flags &= ~IFF_UP; - SC2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING; - sc->sc_vhid = -1; - carp_multicast6_cleanup(sc, 1); - TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list); - if (!--cif->vhif_nvrs) { - CARP_LOCK_DESTROY(cif); - sc->sc_carpdev->if_carp = NULL; - free(cif, M_CARP); - } else - CARP_UNLOCK(cif); - } + if ((error = ifpromisc(ifp, 1)) != 0) + printf("%s: ifpromisc(%s) failed: %d\n", + __func__, ifp->if_xname, error); + else + cif->cif_flags |= CIF_PROMISC; - return (error); + CIF_LOCK_INIT(cif); + cif->cif_ifp = ifp; + TAILQ_INIT(&cif->cif_vrs); + + IF_ADDR_WLOCK(ifp); + ifp->if_carp = cif; + if_ref(ifp); + IF_ADDR_WUNLOCK(ifp); + + return (cif); } -#endif /* INET6 */ -static int -carp_ioctl(struct ifnet *ifp, u_long cmd, caddr_t addr) +static void +carp_free_if(struct carp_if *cif) +{ + struct ifnet *ifp = cif->cif_ifp; + + CIF_LOCK_ASSERT(cif); + KASSERT(TAILQ_EMPTY(&cif->cif_vrs), ("%s: softc list not empty", + __func__)); + + IF_ADDR_WLOCK(ifp); + ifp->if_carp = NULL; + IF_ADDR_WUNLOCK(ifp); + + CIF_LOCK_DESTROY(cif); + + if (cif->cif_flags & CIF_PROMISC) + ifpromisc(ifp, 0); + if_rele(ifp); + + free(cif, M_CARP); +} + +static void +carp_carprcp(struct carpreq *carpr, struct carp_softc *sc, int priv) +{ + + CARP_LOCK(sc); + carpr->carpr_state = sc->sc_state; + carpr->carpr_vhid = sc->sc_vhid; + carpr->carpr_advbase = sc->sc_advbase; + carpr->carpr_advskew = sc->sc_advskew; + if (priv) + bcopy(sc->sc_key, carpr->carpr_key, sizeof(carpr->carpr_key)); + else + bzero(carpr->carpr_key, sizeof(carpr->carpr_key)); + CARP_UNLOCK(sc); +} + +int +carp_ioctl(struct ifreq *ifr, u_long cmd, struct thread *td) { - struct carp_softc *sc = ifp->if_softc, *vr; struct carpreq carpr; - struct ifaddr *ifa; - struct ifreq *ifr; - struct ifaliasreq *ifra; - int locked = 0, error = 0; + struct ifnet *ifp; + struct carp_softc *sc = NULL; + int error = 0, locked = 0; - ifa = (struct ifaddr *)addr; - ifra = (struct ifaliasreq *)addr; - ifr = (struct ifreq *)addr; + if ((error = copyin(ifr->ifr_data, &carpr, sizeof carpr))) + return (error); - switch (cmd) { - case SIOCSIFADDR: - switch (ifa->ifa_addr->sa_family) { -#ifdef INET - case AF_INET: - SC2IFP(sc)->if_flags |= IFF_UP; - bcopy(ifa->ifa_addr, ifa->ifa_dstaddr, - sizeof(struct sockaddr)); - error = carp_set_addr(sc, satosin(ifa->ifa_addr)); - break; -#endif /* INET */ -#ifdef INET6 - case AF_INET6: - SC2IFP(sc)->if_flags |= IFF_UP; - error = carp_set_addr6(sc, satosin6(ifa->ifa_addr)); - break; -#endif /* INET6 */ - default: - error = EAFNOSUPPORT; - break; - } - break; + ifp = ifunit_ref(ifr->ifr_name); + if (ifp == NULL) + return (ENXIO); - case SIOCAIFADDR: - switch (ifa->ifa_addr->sa_family) { -#ifdef INET - case AF_INET: - SC2IFP(sc)->if_flags |= IFF_UP; - bcopy(ifa->ifa_addr, ifa->ifa_dstaddr, - sizeof(struct sockaddr)); - error = carp_set_addr(sc, satosin(&ifra->ifra_addr)); - break; -#endif /* INET */ -#ifdef INET6 - case AF_INET6: - SC2IFP(sc)->if_flags |= IFF_UP; - error = carp_set_addr6(sc, satosin6(&ifra->ifra_addr)); - break; -#endif /* INET6 */ - default: - error = EAFNOSUPPORT; - break; - } + switch (ifp->if_type) { + case IFT_ETHER: + case IFT_L2VLAN: + case IFT_BRIDGE: + case IFT_FDDI: + case IFT_ISO88025: break; + default: + error = EOPNOTSUPP; + goto out; + } - case SIOCDIFADDR: - switch (ifa->ifa_addr->sa_family) { -#ifdef INET - case AF_INET: - error = carp_del_addr(sc, satosin(&ifra->ifra_addr)); - break; -#endif /* INET */ -#ifdef INET6 - case AF_INET6: - error = carp_del_addr6(sc, satosin6(&ifra->ifra_addr)); + if ((ifp->if_flags & IFF_MULTICAST) == 0) { + error = EADDRNOTAVAIL; + goto out; + } + + sx_xlock(&carp_sx); + switch (cmd) { + case SIOCSVH: + if ((error = priv_check(td, PRIV_NETINET_CARP))) break; -#endif /* INET6 */ - default: - error = EAFNOSUPPORT; + if (carpr.carpr_vhid <= 0 || carpr.carpr_vhid > CARP_MAXVHID || + carpr.carpr_advbase < 0 || carpr.carpr_advskew < 0) { + error = EINVAL; break; } - break; - case SIOCSIFFLAGS: - if (sc->sc_carpdev) { - locked = 1; - CARP_SCLOCK(sc); + if (ifp->if_carp) { + CIF_LOCK(ifp->if_carp); + IFNET_FOREACH_CARP(ifp, sc) + if (sc->sc_vhid == carpr.carpr_vhid) + break; + CIF_UNLOCK(ifp->if_carp); } - if (sc->sc_state != INIT && !(ifr->ifr_flags & IFF_UP)) { - callout_stop(&sc->sc_ad_tmo); - callout_stop(&sc->sc_md_tmo); - callout_stop(&sc->sc_md6_tmo); - if (sc->sc_state == MASTER) - carp_send_ad_locked(sc); - carp_set_state(sc, INIT); - carp_setrun(sc, 0); - } else if (sc->sc_state == INIT && (ifr->ifr_flags & IFF_UP)) { - SC2IFP(sc)->if_flags |= IFF_UP; - carp_setrun(sc, 0); + if (sc == NULL) { + sc = carp_alloc(ifp); + CARP_LOCK(sc); + sc->sc_vhid = carpr.carpr_vhid; + LLADDR(&sc->sc_addr)[0] = 0; + LLADDR(&sc->sc_addr)[1] = 0; + LLADDR(&sc->sc_addr)[2] = 0x5e; + LLADDR(&sc->sc_addr)[3] = 0; + LLADDR(&sc->sc_addr)[4] = 1; + LLADDR(&sc->sc_addr)[5] = sc->sc_vhid; + } else + CARP_LOCK(sc); + locked = 1; + if (carpr.carpr_advbase > 0) { + if (carpr.carpr_advbase > 255 || + carpr.carpr_advbase < CARP_DFLTINTV) { + error = EINVAL; + break; + } + sc->sc_advbase = carpr.carpr_advbase; } - break; - - case SIOCSVH: - error = priv_check(curthread, PRIV_NETINET_CARP); - if (error) - break; - if ((error = copyin(ifr->ifr_data, &carpr, sizeof carpr))) + if (carpr.carpr_advskew >= 255) { + error = EINVAL; break; - error = 1; - if (sc->sc_carpdev) { - locked = 1; - CARP_SCLOCK(sc); } - if (sc->sc_state != INIT && carpr.carpr_state != sc->sc_state) { + sc->sc_advskew = carpr.carpr_advskew; + if (carpr.carpr_key[0] != '\0') { + bcopy(carpr.carpr_key, sc->sc_key, sizeof(sc->sc_key)); + carp_hmac_prepare(sc); + } + if (sc->sc_state != INIT && + carpr.carpr_state != sc->sc_state) { switch (carpr.carpr_state) { case BACKUP: callout_stop(&sc->sc_ad_tmo); - carp_set_state(sc, BACKUP); + carp_set_state(sc, BACKUP, + "user requested via ifconfig"); carp_setrun(sc, 0); - carp_setroute(sc, RTM_DELETE); + carp_delroute(sc); break; case MASTER: - carp_master_down_locked(sc); + carp_master_down_locked(sc, + "user requested via ifconfig"); break; default: break; } } - if (carpr.carpr_vhid > 0) { - if (carpr.carpr_vhid > 255) { - error = EINVAL; - break; - } - if (sc->sc_carpdev) { - struct carp_if *cif; - cif = (struct carp_if *)sc->sc_carpdev->if_carp; - TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) - if (vr != sc && - vr->sc_vhid == carpr.carpr_vhid) { - error = EEXIST; - break; - } - if (error == EEXIST) - break; - } - sc->sc_vhid = carpr.carpr_vhid; - IF_LLADDR(sc->sc_ifp)[0] = 0; - IF_LLADDR(sc->sc_ifp)[1] = 0; - IF_LLADDR(sc->sc_ifp)[2] = 0x5e; - IF_LLADDR(sc->sc_ifp)[3] = 0; - IF_LLADDR(sc->sc_ifp)[4] = 1; - IF_LLADDR(sc->sc_ifp)[5] = sc->sc_vhid; - error--; + break; + + case SIOCGVH: + { + int priveleged; + + if (carpr.carpr_vhid < 0 || carpr.carpr_vhid > CARP_MAXVHID) { + error = EINVAL; + break; } - if (carpr.carpr_advbase > 0 || carpr.carpr_advskew > 0) { - if (carpr.carpr_advskew >= 255) { - error = EINVAL; + if (carpr.carpr_count < 1) { + error = EMSGSIZE; + break; + } + if (ifp->if_carp == NULL) { + error = ENOENT; + break; + } + + priveleged = (priv_check(td, PRIV_NETINET_CARP) == 0); + if (carpr.carpr_vhid != 0) { + CIF_LOCK(ifp->if_carp); + IFNET_FOREACH_CARP(ifp, sc) + if (sc->sc_vhid == carpr.carpr_vhid) + break; + CIF_UNLOCK(ifp->if_carp); + if (sc == NULL) { + error = ENOENT; break; } - if (carpr.carpr_advbase > 255) { - error = EINVAL; + carp_carprcp(&carpr, sc, priveleged); + error = copyout(&carpr, ifr->ifr_data, sizeof(carpr)); + } else { + int i, count; + + count = 0; + CIF_LOCK(ifp->if_carp); + IFNET_FOREACH_CARP(ifp, sc) + count++; + + if (count > carpr.carpr_count) { + CIF_UNLOCK(ifp->if_carp); + error = EMSGSIZE; break; } - sc->sc_advbase = carpr.carpr_advbase; - sc->sc_advskew = carpr.carpr_advskew; - error--; - } - bcopy(carpr.carpr_key, sc->sc_key, sizeof(sc->sc_key)); - if (error > 0) - error = EINVAL; - else { - error = 0; - carp_setrun(sc, 0); - } - break; - case SIOCGVH: - /* XXX: lockless read */ - bzero(&carpr, sizeof(carpr)); - carpr.carpr_state = sc->sc_state; - carpr.carpr_vhid = sc->sc_vhid; - carpr.carpr_advbase = sc->sc_advbase; - carpr.carpr_advskew = sc->sc_advskew; - error = priv_check(curthread, PRIV_NETINET_CARP); - if (error == 0) - bcopy(sc->sc_key, carpr.carpr_key, - sizeof(carpr.carpr_key)); - error = copyout(&carpr, ifr->ifr_data, sizeof(carpr)); + i = 0; + IFNET_FOREACH_CARP(ifp, sc) { + carp_carprcp(&carpr, sc, priveleged); + carpr.carpr_count = count; + error = copyout(&carpr, ifr->ifr_data + + (i * sizeof(carpr)), sizeof(carpr)); + if (error) { + CIF_UNLOCK(ifp->if_carp); + break; + } + i++; + } + CIF_UNLOCK(ifp->if_carp); + } break; - + } default: error = EINVAL; } + sx_xunlock(&carp_sx); +out: if (locked) - CARP_SCUNLOCK(sc); - - carp_hmac_prepare(sc); + CARP_UNLOCK(sc); + if_rele(ifp); return (error); } -/* - * XXX: this is looutput. We should eventually use it from there. - */ static int -carp_looutput(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst, - struct route *ro) +carp_get_vhid(struct ifaddr *ifa) { - u_int32_t af; - struct rtentry *rt = NULL; - - M_ASSERTPKTHDR(m); /* check if we have the packet header */ - - if (ro != NULL) - rt = ro->ro_rt; - if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) { - m_freem(m); - return (rt->rt_flags & RTF_BLACKHOLE ? 0 : - rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH); - } - ifp->if_opackets++; - ifp->if_obytes += m->m_pkthdr.len; - - /* BPF writes need to be handled specially. */ - if (dst->sa_family == AF_UNSPEC) { - bcopy(dst->sa_data, &af, sizeof(af)); - dst->sa_family = af; - } - -#if 1 /* XXX */ - switch (dst->sa_family) { - case AF_INET: - case AF_INET6: - case AF_IPX: - case AF_APPLETALK: - break; - default: - printf("carp_looutput: af=%d unexpected\n", dst->sa_family); - m_freem(m); - return (EAFNOSUPPORT); - } -#endif - return(if_simloop(ifp, m, dst->sa_family, 0)); -} + if (ifa == NULL || ifa->ifa_carp == NULL) + return (0); -/* - * Start output on carp interface. This function should never be called. - */ -static void -carp_start(struct ifnet *ifp) -{ -#ifdef DEBUG - printf("%s: start called\n", ifp->if_xname); -#endif + return (ifa->ifa_carp->sc_vhid); } int -carp_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa, - struct rtentry *rt) +carp_attach(struct ifaddr *ifa, int vhid) { - struct m_tag *mtag; + struct ifnet *ifp = ifa->ifa_ifp; + struct carp_if *cif = ifp->if_carp; struct carp_softc *sc; - struct ifnet *carp_ifp; + int index, error; - if (!sa) - return (0); + KASSERT(ifa->ifa_carp == NULL, ("%s: ifa %p attached", __func__, ifa)); - switch (sa->sa_family) { + switch (ifa->ifa_addr->sa_family) { #ifdef INET case AF_INET: - break; -#endif /* INET */ +#endif #ifdef INET6 case AF_INET6: +#endif break; -#endif /* INET6 */ default: - return (0); + return (EPROTOTYPE); } - mtag = m_tag_find(m, PACKET_TAG_CARP, NULL); - if (mtag == NULL) - return (0); + sx_xlock(&carp_sx); + if (ifp->if_carp == NULL) { + sx_xunlock(&carp_sx); + return (ENOPROTOOPT); + } - bcopy(mtag + 1, &carp_ifp, sizeof(struct ifnet *)); - sc = carp_ifp->if_softc; + CIF_LOCK(cif); + IFNET_FOREACH_CARP(ifp, sc) + if (sc->sc_vhid == vhid) + break; + CIF_UNLOCK(cif); + if (sc == NULL) { + sx_xunlock(&carp_sx); + return (ENOENT); + } - /* Set the source MAC address to Virtual Router MAC Address */ - switch (ifp->if_type) { - case IFT_ETHER: - case IFT_L2VLAN: { - struct ether_header *eh; + error = carp_multicast_setup(cif, ifa->ifa_addr->sa_family); + if (error) { + CIF_FREE(cif); + sx_xunlock(&carp_sx); + return (error); + } - eh = mtod(m, struct ether_header *); - eh->ether_shost[0] = 0; - eh->ether_shost[1] = 0; - eh->ether_shost[2] = 0x5e; - eh->ether_shost[3] = 0; - eh->ether_shost[4] = 1; - eh->ether_shost[5] = sc->sc_vhid; - } - break; - case IFT_FDDI: { - struct fddi_header *fh; + index = sc->sc_naddrs + sc->sc_naddrs6 + 1; + if (index > sc->sc_ifasiz / sizeof(struct ifaddr *)) + carp_grow_ifas(sc); - fh = mtod(m, struct fddi_header *); - fh->fddi_shost[0] = 0; - fh->fddi_shost[1] = 0; - fh->fddi_shost[2] = 0x5e; - fh->fddi_shost[3] = 0; - fh->fddi_shost[4] = 1; - fh->fddi_shost[5] = sc->sc_vhid; - } + switch (ifa->ifa_addr->sa_family) { +#ifdef INET + case AF_INET: + cif->cif_naddrs++; + sc->sc_naddrs++; break; - case IFT_ISO88025: { - struct iso88025_header *th; - th = mtod(m, struct iso88025_header *); - th->iso88025_shost[0] = 3; - th->iso88025_shost[1] = 0; - th->iso88025_shost[2] = 0x40 >> (sc->sc_vhid - 1); - th->iso88025_shost[3] = 0x40000 >> (sc->sc_vhid - 1); - th->iso88025_shost[4] = 0; - th->iso88025_shost[5] = 0; - } +#endif +#ifdef INET6 + case AF_INET6: + cif->cif_naddrs6++; + sc->sc_naddrs6++; break; - default: - printf("%s: carp is not supported for this interface type\n", - ifp->if_xname); - return (EOPNOTSUPP); +#endif } + ifa_ref(ifa); + + CARP_LOCK(sc); + sc->sc_ifas[index - 1] = ifa; + ifa->ifa_carp = sc; + carp_hmac_prepare(sc); + carp_sc_state(sc); + CARP_UNLOCK(sc); + + sx_xunlock(&carp_sx); + return (0); } -static void -carp_set_state(struct carp_softc *sc, int state) +void +carp_detach(struct ifaddr *ifa) { - int link_state; + struct ifnet *ifp = ifa->ifa_ifp; + struct carp_if *cif = ifp->if_carp; + struct carp_softc *sc = ifa->ifa_carp; + int i, index; - if (sc->sc_carpdev) - CARP_SCLOCK_ASSERT(sc); + KASSERT(sc != NULL, ("%s: %p not attached", __func__, ifa)); - if (sc->sc_state == state) - return; + sx_xlock(&carp_sx); - sc->sc_state = state; - switch (state) { - case BACKUP: - link_state = LINK_STATE_DOWN; - break; - case MASTER: - link_state = LINK_STATE_UP; + CARP_LOCK(sc); + /* Shift array. */ + index = sc->sc_naddrs + sc->sc_naddrs6; + for (i = 0; i < index; i++) + if (sc->sc_ifas[i] == ifa) + break; + KASSERT(i < index, ("%s: %p no backref", __func__, ifa)); + for (; i < index - 1; i++) + sc->sc_ifas[i] = sc->sc_ifas[i+1]; + sc->sc_ifas[index - 1] = NULL; + + switch (ifa->ifa_addr->sa_family) { +#ifdef INET + case AF_INET: + cif->cif_naddrs--; + sc->sc_naddrs--; break; - default: - link_state = LINK_STATE_UNKNOWN; +#endif +#ifdef INET6 + case AF_INET6: + cif->cif_naddrs6--; + sc->sc_naddrs6--; break; +#endif } - if_link_state_change(SC2IFP(sc), link_state); + + carp_ifa_delroute(ifa); + carp_multicast_cleanup(cif, ifa->ifa_addr->sa_family); + + ifa->ifa_carp = NULL; + ifa_free(ifa); + + carp_hmac_prepare(sc); + carp_sc_state(sc); + + if (sc->sc_naddrs == 0 && sc->sc_naddrs6 == 0) + carp_destroy(sc); + else + CARP_UNLOCK(sc); + + CIF_FREE(cif); + + sx_xunlock(&carp_sx); } -void -carp_carpdev_state(struct ifnet *ifp) +static void +carp_set_state(struct carp_softc *sc, int state, const char *reason) { - struct carp_if *cif; - cif = ifp->if_carp; - CARP_LOCK(cif); - carp_carpdev_state_locked(cif); - CARP_UNLOCK(cif); + CARP_LOCK_ASSERT(sc); + + if (sc->sc_state != state) { + const char *carp_states[] = { CARP_STATES }; + char subsys[IFNAMSIZ+5]; + + snprintf(subsys, IFNAMSIZ+5, "%u@%s", sc->sc_vhid, + sc->sc_carpdev->if_xname); + + CARP_LOG("%s: %s -> %s (%s)\n", subsys, + carp_states[sc->sc_state], carp_states[state], reason); + + sc->sc_state = state; + + devctl_notify("CARP", subsys, carp_states[state], NULL); + } } static void -carp_carpdev_state_locked(struct carp_if *cif) +carp_linkstate(struct ifnet *ifp) { struct carp_softc *sc; - TAILQ_FOREACH(sc, &cif->vhif_vrs, sc_list) - carp_sc_state_locked(sc); + CIF_LOCK(ifp->if_carp); + IFNET_FOREACH_CARP(ifp, sc) { + CARP_LOCK(sc); + carp_sc_state(sc); + CARP_UNLOCK(sc); + } + CIF_UNLOCK(ifp->if_carp); } static void -carp_sc_state_locked(struct carp_softc *sc) +carp_sc_state(struct carp_softc *sc) { - CARP_SCLOCK_ASSERT(sc); + + CARP_LOCK_ASSERT(sc); if (sc->sc_carpdev->if_link_state != LINK_STATE_UP || !(sc->sc_carpdev->if_flags & IFF_UP)) { - sc->sc_flags_backup = SC2IFP(sc)->if_flags; - SC2IFP(sc)->if_flags &= ~IFF_UP; - SC2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING; callout_stop(&sc->sc_ad_tmo); +#ifdef INET callout_stop(&sc->sc_md_tmo); +#endif +#ifdef INET6 callout_stop(&sc->sc_md6_tmo); - carp_set_state(sc, INIT); +#endif + carp_set_state(sc, INIT, "hardware interface down"); carp_setrun(sc, 0); - if (!sc->sc_suppress) { - carp_suppress_preempt++; - if (carp_suppress_preempt == 1) { - CARP_SCUNLOCK(sc); - carp_send_ad_all(); - CARP_SCLOCK(sc); - } - } + if (!sc->sc_suppress) + carp_demote_adj(V_carp_ifdown_adj, "interface down"); sc->sc_suppress = 1; } else { - SC2IFP(sc)->if_flags |= sc->sc_flags_backup; - carp_set_state(sc, INIT); + carp_set_state(sc, INIT, "hardware interface up"); carp_setrun(sc, 0); if (sc->sc_suppress) - carp_suppress_preempt--; + carp_demote_adj(-V_carp_ifdown_adj, "interface up"); sc->sc_suppress = 0; } +} + +static void +carp_demote_adj(int adj, char *reason) +{ + atomic_add_int(&V_carp_demotion, adj); + CARP_LOG("demoted by %d to %d (%s)\n", adj, V_carp_demotion, reason); + taskqueue_enqueue(taskqueue_swi, &carp_sendall_task); +} + +static int +carp_demote_adj_sysctl(SYSCTL_HANDLER_ARGS) +{ + int new, error; - return; + new = V_carp_demotion; + error = sysctl_handle_int(oidp, &new, 0, req); + if (error || !req->newptr) + return (error); + + carp_demote_adj(new, "sysctl"); + + return (0); } #ifdef INET @@ -2313,7 +2029,7 @@ static struct protosw in_carp_protosw = { .pr_protocol = IPPROTO_CARP, .pr_flags = PR_ATOMIC|PR_ADDR, .pr_input = carp_input, - .pr_output = (pr_output_t *)rip_output, + .pr_output = rip_output, .pr_ctloutput = rip_ctloutput, .pr_usrreqs = &rip_usrreqs }; @@ -2321,7 +2037,7 @@ static struct protosw in_carp_protosw = { #ifdef INET6 extern struct domain inet6domain; -static struct ip6protosw in6_carp_protosw = { +static struct protosw in6_carp_protosw = { .pr_type = SOCK_RAW, .pr_domain = &inet6domain, .pr_protocol = IPPROTO_CARP, @@ -2337,10 +2053,6 @@ static void carp_mod_cleanup(void) { - if (if_detach_event_tag == NULL) - return; - EVENTHANDLER_DEREGISTER(ifnet_departure_event, if_detach_event_tag); - if_clone_detach(&carp_cloner); #ifdef INET if (proto_reg[CARP_INET] == 0) { (void)ipproto_unregister(IPPROTO_CARP); @@ -2358,10 +2070,19 @@ carp_mod_cleanup(void) carp_iamatch6_p = NULL; carp_macmatch6_p = NULL; #endif + carp_ioctl_p = NULL; + carp_attach_p = NULL; + carp_detach_p = NULL; + carp_get_vhid_p = NULL; carp_linkstate_p = NULL; carp_forus_p = NULL; carp_output_p = NULL; + carp_demote_adj_p = NULL; + carp_master_p = NULL; + mtx_unlock(&carp_mtx); + taskqueue_drain(taskqueue_swi, &carp_sendall_task); mtx_destroy(&carp_mtx); + sx_destroy(&carp_sx); } static int @@ -2369,22 +2090,24 @@ carp_mod_load(void) { int err; - if_detach_event_tag = EVENTHANDLER_REGISTER(ifnet_departure_event, - carp_ifdetach, NULL, EVENTHANDLER_PRI_ANY); - if (if_detach_event_tag == NULL) - return (ENOMEM); mtx_init(&carp_mtx, "carp_mtx", NULL, MTX_DEF); - LIST_INIT(&carpif_list); - if_clone_attach(&carp_cloner); - carp_linkstate_p = carp_carpdev_state; + sx_init(&carp_sx, "carp_sx"); + LIST_INIT(&carp_list); + carp_get_vhid_p = carp_get_vhid; carp_forus_p = carp_forus; carp_output_p = carp_output; + carp_linkstate_p = carp_linkstate; + carp_ioctl_p = carp_ioctl; + carp_attach_p = carp_attach; + carp_detach_p = carp_detach; + carp_demote_adj_p = carp_demote_adj; + carp_master_p = carp_master; #ifdef INET6 carp_iamatch6_p = carp_iamatch6; carp_macmatch6_p = carp_macmatch6; proto_reg[CARP_INET6] = pf_proto_register(PF_INET6, (struct protosw *)&in6_carp_protosw); - if (proto_reg[CARP_INET6] != 0) { + if (proto_reg[CARP_INET6]) { printf("carp: error %d attaching to PF_INET6\n", proto_reg[CARP_INET6]); carp_mod_cleanup(); @@ -2400,7 +2123,7 @@ carp_mod_load(void) #ifdef INET carp_iamatch_p = carp_iamatch; proto_reg[CARP_INET] = pf_proto_register(PF_INET, &in_carp_protosw); - if (proto_reg[CARP_INET] != 0) { + if (proto_reg[CARP_INET]) { printf("carp: error %d attaching to PF_INET\n", proto_reg[CARP_INET]); carp_mod_cleanup(); @@ -2413,7 +2136,7 @@ carp_mod_load(void) return (err); } #endif - return 0; + return (0); } static int @@ -2424,17 +2147,13 @@ carp_modevent(module_t mod, int type, void *data) return carp_mod_load(); /* NOTREACHED */ case MOD_UNLOAD: - /* - * XXX: For now, disallow module unloading by default due to - * a race condition where a thread may dereference one of the - * function pointer hooks after the module has been - * unloaded, during processing of a packet, causing a panic. - */ -#ifdef CARPMOD_CAN_UNLOAD - carp_mod_cleanup(); -#else - return (EBUSY); -#endif + mtx_lock(&carp_mtx); + if (LIST_EMPTY(&carp_list)) + carp_mod_cleanup(); + else { + mtx_unlock(&carp_mtx); + return (EBUSY); + } break; default: |