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NetBSD/sys/netinet/ip_carp.c

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/* $NetBSD: ip_carp.c,v 1.116 2021/09/30 03:43:25 yamaguchi Exp $ */
/* $OpenBSD: ip_carp.c,v 1.113 2005/11/04 08:11:54 mcbride Exp $ */
/*
* Copyright (c) 2002 Michael Shalayeff. All rights reserved.
* Copyright (c) 2003 Ryan McBride. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR OR HIS RELATIVES BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF MIND, USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifdef _KERNEL_OPT
#include "opt_inet.h"
#include "opt_mbuftrace.h"
#endif
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: ip_carp.c,v 1.116 2021/09/30 03:43:25 yamaguchi Exp $");
/*
* TODO:
* - iface reconfigure
* - support for hardware checksum calculations;
*
*/
#include <sys/param.h>
#include <sys/proc.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/callout.h>
#include <sys/ioctl.h>
#include <sys/errno.h>
#include <sys/device.h>
#include <sys/time.h>
#include <sys/kernel.h>
#include <sys/kauth.h>
#include <sys/sysctl.h>
#include <sys/ucred.h>
#include <sys/syslog.h>
#include <sys/acct.h>
#include <sys/cprng.h>
#include <sys/cpu.h>
#include <sys/pserialize.h>
#include <sys/psref.h>
#include <net/if.h>
#include <net/pfil.h>
#include <net/if_types.h>
#include <net/if_ether.h>
#include <net/route.h>
#include <net/netisr.h>
#include <net/net_stats.h>
#include <netinet/if_inarp.h>
#include <netinet/wqinput.h>
#ifdef INET
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/in_var.h>
#include <netinet/ip.h>
#include <netinet/ip_var.h>
#include <net/if_dl.h>
#endif
#ifdef INET6
#include <netinet/icmp6.h>
#include <netinet/ip6.h>
#include <netinet6/ip6_var.h>
#include <netinet6/nd6.h>
#include <netinet6/scope6_var.h>
#include <netinet6/in6_var.h>
#endif
#include <net/bpf.h>
#include <sys/sha1.h>
#include <netinet/ip_carp.h>
#include "ioconf.h"
struct carp_mc_entry {
LIST_ENTRY(carp_mc_entry) mc_entries;
union {
struct ether_multi *mcu_enm;
} mc_u;
struct sockaddr_storage mc_addr;
};
#define mc_enm mc_u.mcu_enm
struct carp_softc {
struct ethercom sc_ac;
#define sc_if sc_ac.ec_if
#define sc_carpdev sc_ac.ec_if.if_carpdev
void *sc_linkstate_hook;
int ah_cookie;
int lh_cookie;
struct ip_moptions sc_imo;
#ifdef INET6
struct ip6_moptions sc_im6o;
#endif /* INET6 */
TAILQ_ENTRY(carp_softc) sc_list;
enum { INIT = 0, BACKUP, MASTER } sc_state;
int sc_suppress;
int sc_bow_out;
int sc_sendad_errors;
#define CARP_SENDAD_MAX_ERRORS 3
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;
/* authentication */
#define CARP_HMAC_PAD 64
unsigned char sc_key[CARP_KEY_LEN];
unsigned char sc_pad[CARP_HMAC_PAD];
SHA1_CTX sc_sha1;
u_int32_t sc_hashkey[2];
struct callout sc_ad_tmo; /* advertisement timeout */
struct callout sc_md_tmo; /* master down timeout */
struct callout sc_md6_tmo; /* master down timeout */
LIST_HEAD(__carp_mchead, carp_mc_entry) carp_mc_listhead;
};
int carp_suppress_preempt = 0;
static int carp_opts[CARPCTL_MAXID] = { 0, 1, 0, 0, 0 }; /* XXX for now */
static percpu_t *carpstat_percpu;
#define CARP_STATINC(x) _NET_STATINC(carpstat_percpu, x)
#ifdef MBUFTRACE
static struct mowner carp_proto_mowner_rx = MOWNER_INIT("carp", "rx");
static struct mowner carp_proto_mowner_tx = MOWNER_INIT("carp", "tx");
static struct mowner carp_proto6_mowner_rx = MOWNER_INIT("carp6", "rx");
static struct mowner carp_proto6_mowner_tx = MOWNER_INIT("carp6", "tx");
#endif
struct carp_if {
TAILQ_HEAD(, carp_softc) vhif_vrs;
int vhif_nvrs;
struct ifnet *vhif_ifp;
};
#define CARP_LOG(sc, s) \
if (carp_opts[CARPCTL_LOG]) { \
if (sc) \
log(LOG_INFO, "%s: ", \
(sc)->sc_if.if_xname); \
else \
log(LOG_INFO, "carp: "); \
addlog s; \
addlog("\n"); \
}
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_proto_input_c(struct mbuf *, struct carp_header *,
sa_family_t);
static void carpdetach(struct carp_softc *);
static void 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_arp(struct carp_softc *);
static void carp_master_down(void *);
static int carp_ioctl(struct ifnet *, u_long, void *);
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);
static int carp_addrcount(struct carp_if *, struct in_ifaddr *, int);
enum { CARP_COUNT_MASTER, CARP_COUNT_RUNNING };
static void carp_multicast_cleanup(struct carp_softc *);
static int carp_set_ifp(struct carp_softc *, struct ifnet *);
static void carp_set_enaddr(struct carp_softc *);
#if 0
static void carp_addr_updated(void *);
#endif
static u_int32_t carp_hash(struct carp_softc *, u_char *);
static int carp_set_addr(struct carp_softc *, struct sockaddr_in *);
static int carp_join_multicast(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_join_multicast6(struct carp_softc *);
#endif
static int carp_clone_create(struct if_clone *, int);
static int carp_clone_destroy(struct ifnet *);
static int carp_ether_addmulti(struct carp_softc *, struct ifreq *);
static int carp_ether_delmulti(struct carp_softc *, struct ifreq *);
static void carp_ether_purgemulti(struct carp_softc *);
static void carp_update_link_state(struct carp_softc *sc);
static void sysctl_net_inet_carp_setup(struct sysctllog **);
/* workqueue-based pr_input */
static struct wqinput *carp_wqinput;
static void _carp_proto_input(struct mbuf *, int, int);
#ifdef INET6
static struct wqinput *carp6_wqinput;
static void _carp6_proto_input(struct mbuf *, int, int);
#endif
struct if_clone carp_cloner =
IF_CLONE_INITIALIZER("carp", carp_clone_create, carp_clone_destroy);
static __inline u_int16_t
carp_cksum(struct mbuf *m, int len)
{
return (in_cksum(m, len));
}
#ifdef INET6
static __inline u_int16_t
carp6_cksum(struct mbuf *m, uint32_t off, uint32_t len)
{
return (in6_cksum(m, IPPROTO_CARP, off, len));
}
#endif
static void
carp_hmac_prepare(struct carp_softc *sc)
{
u_int8_t carp_version = CARP_VERSION, type = CARP_ADVERTISEMENT;
u_int8_t vhid = sc->sc_vhid & 0xff;
SHA1_CTX sha1ctx;
u_int32_t kmd[5];
struct ifaddr *ifa;
int i, found;
struct in_addr last, cur, in;
#ifdef INET6
struct in6_addr last6, cur6, in6;
#endif /* INET6 */
/* compute ipad from key */
memset(sc->sc_pad, 0, sizeof(sc->sc_pad));
memcpy(sc->sc_pad, sc->sc_key, sizeof(sc->sc_key));
for (i = 0; i < sizeof(sc->sc_pad); i++)
sc->sc_pad[i] ^= 0x36;
/* 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 *)&carp_version, sizeof(carp_version));
SHA1Update(&sc->sc_sha1, (void *)&type, sizeof(type));
/* generate a key for the arpbalance hash, before the vhid is hashed */
memcpy(&sha1ctx, &sc->sc_sha1, sizeof(sha1ctx));
SHA1Final((unsigned char *)kmd, &sha1ctx);
sc->sc_hashkey[0] = kmd[0] ^ kmd[1];
sc->sc_hashkey[1] = kmd[2] ^ kmd[3];
/* the rest of the precomputation */
SHA1Update(&sc->sc_sha1, (void *)&vhid, sizeof(vhid));
/* Hash the addresses from smallest to largest, not interface order */
#ifdef INET
cur.s_addr = 0;
do {
int s;
found = 0;
last = cur;
cur.s_addr = 0xffffffff;
s = pserialize_read_enter();
IFADDR_READER_FOREACH(ifa, &sc->sc_if) {
in.s_addr = ifatoia(ifa)->ia_addr.sin_addr.s_addr;
if (ifa->ifa_addr->sa_family == AF_INET &&
ntohl(in.s_addr) > ntohl(last.s_addr) &&
ntohl(in.s_addr) < ntohl(cur.s_addr)) {
cur.s_addr = in.s_addr;
found++;
}
}
pserialize_read_exit(s);
if (found)
SHA1Update(&sc->sc_sha1, (void *)&cur, sizeof(cur));
} while (found);
#endif /* INET */
#ifdef INET6
memset(&cur6, 0x00, sizeof(cur6));
do {
int s;
found = 0;
last6 = cur6;
memset(&cur6, 0xff, sizeof(cur6));
s = pserialize_read_enter();
IFADDR_READER_FOREACH(ifa, &sc->sc_if) {
in6 = ifatoia6(ifa)->ia_addr.sin6_addr;
if (IN6_IS_ADDR_LINKLOCAL(&in6))
in6.s6_addr16[1] = 0;
if (ifa->ifa_addr->sa_family == AF_INET6 &&
memcmp(&in6, &last6, sizeof(in6)) > 0 &&
memcmp(&in6, &cur6, sizeof(in6)) < 0) {
cur6 = in6;
found++;
}
}
pserialize_read_exit(s);
if (found)
SHA1Update(&sc->sc_sha1, (void *)&cur6, sizeof(cur6));
} while (found);
#endif /* INET6 */
/* convert ipad to opad */
for (i = 0; i < sizeof(sc->sc_pad); i++)
sc->sc_pad[i] ^= 0x36 ^ 0x5c;
}
static void
carp_hmac_generate(struct carp_softc *sc, u_int32_t counter[2],
unsigned char md[20])
{
SHA1_CTX sha1ctx;
/* fetch first half of inner hash */
memcpy(&sha1ctx, &sc->sc_sha1, sizeof(sha1ctx));
SHA1Update(&sha1ctx, (void *)counter, sizeof(sc->sc_counter));
SHA1Final(md, &sha1ctx);
/* outer hash */
SHA1Init(&sha1ctx);
SHA1Update(&sha1ctx, sc->sc_pad, sizeof(sc->sc_pad));
SHA1Update(&sha1ctx, md, 20);
SHA1Final(md, &sha1ctx);
}
static int
carp_hmac_verify(struct carp_softc *sc, u_int32_t counter[2],
unsigned char md[20])
{
unsigned char md2[20];
carp_hmac_generate(sc, counter, md2);
return (memcmp(md, md2, sizeof(md2)));
}
static void
carp_setroute(struct carp_softc *sc, int cmd)
{
struct ifaddr *ifa;
int s, bound;
KERNEL_LOCK(1, NULL);
bound = curlwp_bind();
s = pserialize_read_enter();
IFADDR_READER_FOREACH(ifa, &sc->sc_if) {
struct psref psref;
ifa_acquire(ifa, &psref);
pserialize_read_exit(s);
switch (ifa->ifa_addr->sa_family) {
case AF_INET: {
int count = 0;
struct rtentry *rt;
int hr_otherif, nr_ourif;
/*
* Avoid screwing with the routes if there are other
* carp interfaces which are master and have the same
* address.
*/
if (sc->sc_carpdev != NULL &&
sc->sc_carpdev->if_carp != NULL) {
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))
goto next;
}
/* Remove the existing host route, if any */
rtrequest(RTM_DELETE, ifa->ifa_addr,
ifa->ifa_addr, ifa->ifa_netmask,
RTF_HOST, NULL);
rt = NULL;
(void)rtrequest(RTM_GET, ifa->ifa_addr, ifa->ifa_addr,
ifa->ifa_netmask, RTF_HOST, &rt);
hr_otherif = (rt && rt->rt_ifp != &sc->sc_if &&
(rt->rt_flags & RTF_CONNECTED));
if (rt != NULL) {
rt_unref(rt);
rt = NULL;
}
/* Check for a network route on our interface */
rt = NULL;
(void)rtrequest(RTM_GET, ifa->ifa_addr, ifa->ifa_addr,
ifa->ifa_netmask, 0, &rt);
nr_ourif = (rt && rt->rt_ifp == &sc->sc_if);
switch (cmd) {
case RTM_ADD:
if (hr_otherif) {
ifa->ifa_rtrequest = NULL;
ifa->ifa_flags &= ~RTF_CONNECTED;
rtrequest(RTM_ADD, ifa->ifa_addr,
ifa->ifa_addr, ifa->ifa_netmask,
RTF_UP | RTF_HOST, NULL);
}
if (!hr_otherif || nr_ourif || !rt) {
if (nr_ourif &&
(rt->rt_flags & RTF_CONNECTED) == 0)
rtrequest(RTM_DELETE,
ifa->ifa_addr,
ifa->ifa_addr,
ifa->ifa_netmask, 0, NULL);
ifa->ifa_rtrequest = arp_rtrequest;
ifa->ifa_flags |= RTF_CONNECTED;
if (rtrequest(RTM_ADD, ifa->ifa_addr,
ifa->ifa_addr, ifa->ifa_netmask, 0,
NULL) == 0)
ifa->ifa_flags |= IFA_ROUTE;
}
break;
case RTM_DELETE:
break;
default:
break;
}
if (rt != NULL) {
rt_unref(rt);
rt = NULL;
}
break;
}
#ifdef INET6
case AF_INET6:
if (cmd == RTM_ADD)
in6_ifaddlocal(ifa);
else
in6_ifremlocal(ifa);
break;
#endif /* INET6 */
default:
break;
}
next:
s = pserialize_read_enter();
ifa_release(ifa, &psref);
}
pserialize_read_exit(s);
curlwp_bindx(bound);
KERNEL_UNLOCK_ONE(NULL);
}
/*
* process input packet.
* we have rearranged checks order compared to the rfc,
* but it seems more efficient this way or not possible otherwise.
*/
static void
_carp_proto_input(struct mbuf *m, int hlen, int proto)
{
struct ip *ip = mtod(m, struct ip *);
struct carp_softc *sc = NULL;
struct carp_header *ch;
int iplen, len;
struct ifnet *rcvif;
CARP_STATINC(CARP_STAT_IPACKETS);
MCLAIM(m, &carp_proto_mowner_rx);
if (!carp_opts[CARPCTL_ALLOW]) {
m_freem(m);
return;
}
rcvif = m_get_rcvif_NOMPSAFE(m);
/* check if received on a valid carp interface */
if (rcvif->if_type != IFT_CARP) {
CARP_STATINC(CARP_STAT_BADIF);
CARP_LOG(sc, ("packet received on non-carp interface: %s",
rcvif->if_xname));
m_freem(m);
return;
}
/* verify that the IP TTL is 255. */
if (ip->ip_ttl != CARP_DFLTTL) {
CARP_STATINC(CARP_STAT_BADTTL);
CARP_LOG(sc, ("received ttl %d != %d on %s", ip->ip_ttl,
CARP_DFLTTL, rcvif->if_xname));
m_freem(m);
return;
}
/*
* verify that the received packet length is
* equal to the CARP header
*/
iplen = ip->ip_hl << 2;
len = iplen + sizeof(*ch);
if (len > m->m_pkthdr.len) {
CARP_STATINC(CARP_STAT_BADLEN);
CARP_LOG(sc, ("packet too short %d on %s", m->m_pkthdr.len,
rcvif->if_xname));
m_freem(m);
return;
}
if ((m = m_pullup(m, len)) == NULL) {
CARP_STATINC(CARP_STAT_HDROPS);
return;
}
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)) {
CARP_STATINC(CARP_STAT_BADSUM);
CARP_LOG(sc, ("checksum failed on %s",
rcvif->if_xname));
m_freem(m);
return;
}
m->m_data -= iplen;
carp_proto_input_c(m, ch, AF_INET);
}
void
carp_proto_input(struct mbuf *m, int off, int proto)
{
wqinput_input(carp_wqinput, m, 0, 0);
}
#ifdef INET6
static void
_carp6_proto_input(struct mbuf *m, int off, int proto)
{
struct carp_softc *sc = NULL;
struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
struct carp_header *ch;
u_int len;
struct ifnet *rcvif;
CARP_STATINC(CARP_STAT_IPACKETS6);
MCLAIM(m, &carp_proto6_mowner_rx);
if (!carp_opts[CARPCTL_ALLOW]) {
m_freem(m);
return;
}
rcvif = m_get_rcvif_NOMPSAFE(m);
/* check if received on a valid carp interface */
if (rcvif->if_type != IFT_CARP) {
CARP_STATINC(CARP_STAT_BADIF);
CARP_LOG(sc, ("packet received on non-carp interface: %s",
rcvif->if_xname));
m_freem(m);
return;
}
/* verify that the IP TTL is 255 */
if (ip6->ip6_hlim != CARP_DFLTTL) {
CARP_STATINC(CARP_STAT_BADTTL);
CARP_LOG(sc, ("received ttl %d != %d on %s", ip6->ip6_hlim,
CARP_DFLTTL, rcvif->if_xname));
m_freem(m);
return;
}
/* verify that we have a complete carp packet */
len = m->m_len;
M_REGION_GET(ch, struct carp_header *, m, off, sizeof(*ch));
if (ch == NULL) {
CARP_STATINC(CARP_STAT_BADLEN);
CARP_LOG(sc, ("packet size %u too small", len));
return;
}
/* verify the CARP checksum */
if (carp6_cksum(m, off, sizeof(*ch))) {
CARP_STATINC(CARP_STAT_BADSUM);
CARP_LOG(sc, ("checksum failed, on %s", rcvif->if_xname));
m_freem(m);
return;
}
carp_proto_input_c(m, ch, AF_INET6);
return;
}
int
carp6_proto_input(struct mbuf **mp, int *offp, int proto)
{
wqinput_input(carp6_wqinput, *mp, *offp, proto);
return IPPROTO_DONE;
}
#endif /* INET6 */
static void
carp_proto_input_c(struct mbuf *m, struct carp_header *ch, sa_family_t af)
{
struct carp_softc *sc;
u_int64_t tmp_counter;
struct timeval sc_tv, ch_tv;
TAILQ_FOREACH(sc, &((struct carp_if *)
m_get_rcvif_NOMPSAFE(m)->if_carpdev->if_carp)->vhif_vrs, sc_list)
if (sc->sc_vhid == ch->carp_vhid)
break;
if (!sc || (sc->sc_if.if_flags & (IFF_UP|IFF_RUNNING)) !=
(IFF_UP|IFF_RUNNING)) {
CARP_STATINC(CARP_STAT_BADVHID);
m_freem(m);
return;
}
/*
* Check if our own advertisement was duplicated
* from a non simplex interface.
* XXX If there is no address on our physical interface
* there is no way to distinguish our ads from the ones
* another carp host might have sent us.
*/
if ((sc->sc_carpdev->if_flags & IFF_SIMPLEX) == 0) {
struct sockaddr sa;
struct ifaddr *ifa;
int s;
memset(&sa, 0, sizeof(sa));
sa.sa_family = af;
s = pserialize_read_enter();
ifa = ifaof_ifpforaddr(&sa, sc->sc_carpdev);
if (ifa && af == AF_INET) {
struct ip *ip = mtod(m, struct ip *);
if (ip->ip_src.s_addr ==
ifatoia(ifa)->ia_addr.sin_addr.s_addr) {
pserialize_read_exit(s);
m_freem(m);
return;
}
}
#ifdef INET6
if (ifa && af == AF_INET6) {
struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
struct in6_addr in6_src, in6_found;
in6_src = ip6->ip6_src;
in6_found = ifatoia6(ifa)->ia_addr.sin6_addr;
if (IN6_IS_ADDR_LINKLOCAL(&in6_src))
in6_src.s6_addr16[1] = 0;
if (IN6_IS_ADDR_LINKLOCAL(&in6_found))
in6_found.s6_addr16[1] = 0;
if (IN6_ARE_ADDR_EQUAL(&in6_src, &in6_found)) {
pserialize_read_exit(s);
m_freem(m);
return;
}
}
#endif /* INET6 */
pserialize_read_exit(s);
}
nanotime(&sc->sc_if.if_lastchange);
if_statadd2(&sc->sc_if, if_ipackets, 1, if_ibytes, m->m_pkthdr.len);
/* verify the CARP version. */
if (ch->carp_version != CARP_VERSION) {
CARP_STATINC(CARP_STAT_BADVER);
if_statinc(&sc->sc_if, if_ierrors);
CARP_LOG(sc, ("invalid version %d != %d",
ch->carp_version, CARP_VERSION));
m_freem(m);
return;
}
/* verify the hash */
if (carp_hmac_verify(sc, ch->carp_counter, ch->carp_md)) {
struct ip *ip;
char ipbuf[INET_ADDRSTRLEN];
#ifdef INET6
struct ip6_hdr *ip6;
char ip6buf[INET6_ADDRSTRLEN];
#endif
CARP_STATINC(CARP_STAT_BADAUTH);
if_statinc(&sc->sc_if, if_ierrors);
switch(af) {
case AF_INET:
ip = mtod(m, struct ip *);
CARP_LOG(sc, ("incorrect hash from %s",
IN_PRINT(ipbuf, &ip->ip_src)));
break;
#ifdef INET6
case AF_INET6:
ip6 = mtod(m, struct ip6_hdr *);
CARP_LOG(sc, ("incorrect hash from %s",
IN6_PRINT(ip6buf, &ip6->ip6_src)));
break;
#endif
default: CARP_LOG(sc, ("incorrect hash"));
break;
}
m_freem(m);
return;
}
tmp_counter = ntohl(ch->carp_counter[0]);
tmp_counter = tmp_counter<<32;
tmp_counter += ntohl(ch->carp_counter[1]);
/* XXX Replay protection goes here */
sc->sc_init_counter = 0;
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;
ch_tv.tv_sec = ch->carp_advbase;
ch_tv.tv_usec = ch->carp_advskew * 1000000 / 256;
switch (sc->sc_state) {
case INIT:
break;
case MASTER:
/*
* If we receive an advertisement from a backup who's going to
* be more frequent than us, go into BACKUP state.
*/
if (timercmp(&sc_tv, &ch_tv, >) ||
timercmp(&sc_tv, &ch_tv, ==)) {
callout_stop(&sc->sc_ad_tmo);
CARP_LOG(sc, ("MASTER -> BACKUP (more frequent advertisement received)"));
carp_set_state(sc, BACKUP);
carp_setrun(sc, 0);
carp_setroute(sc, RTM_DELETE);
}
break;
case BACKUP:
/*
* 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] && timercmp(&sc_tv, &ch_tv, <)) {
CARP_LOG(sc, ("BACKUP -> MASTER (preempting a slower master)"));
carp_master_down(sc);
break;
}
/*
* If the master is going to advertise at such a low frequency
* that he's guaranteed to time out, we'd might as well just
* treat him as timed out now.
*/
sc_tv.tv_sec = sc->sc_advbase * 3;
if (timercmp(&sc_tv, &ch_tv, <)) {
CARP_LOG(sc, ("BACKUP -> MASTER (master timed out)"));
carp_master_down(sc);
break;
}
/*
* Otherwise, we reset the counter and wait for the next
* advertisement.
*/
carp_setrun(sc, af);
break;
}
m_freem(m);
return;
}
/*
* Interface side of the CARP implementation.
*/
/* ARGSUSED */
void
carpattach(int n)
{
if_clone_attach(&carp_cloner);
carpstat_percpu = percpu_alloc(sizeof(uint64_t) * CARP_NSTATS);
}
static int
carp_clone_create(struct if_clone *ifc, int unit)
{
extern int ifqmaxlen;
struct carp_softc *sc;
struct ifnet *ifp;
sc = malloc(sizeof(*sc), M_DEVBUF, M_NOWAIT|M_ZERO);
if (!sc)
return (ENOMEM);
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;
#ifdef INET6
sc->sc_im6o.im6o_multicast_hlim = CARP_DFLTTL;
#endif /* INET6 */
callout_init(&sc->sc_ad_tmo, 0);
callout_init(&sc->sc_md_tmo, 0);
callout_init(&sc->sc_md6_tmo, 0);
callout_setfunc(&sc->sc_ad_tmo, carp_send_ad, sc);
callout_setfunc(&sc->sc_md_tmo, carp_master_down, sc);
callout_setfunc(&sc->sc_md6_tmo, carp_master_down, sc);
LIST_INIT(&sc->carp_mc_listhead);
ifp = &sc->sc_if;
ifp->if_softc = sc;
snprintf(ifp->if_xname, sizeof ifp->if_xname, "%s%d", ifc->ifc_name,
unit);
ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
ifp->if_ioctl = carp_ioctl;
ifp->if_start = carp_start;
IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
IFQ_SET_READY(&ifp->if_snd);
if_initialize(ifp);
ether_ifattach(ifp, NULL);
/* Overwrite ethernet defaults */
ifp->if_type = IFT_CARP;
ifp->if_output = carp_output;
ifp->if_link_state = LINK_STATE_DOWN;
carp_set_enaddr(sc);
if_register(ifp);
return (0);
}
static int
carp_clone_destroy(struct ifnet *ifp)
{
struct carp_softc *sc = ifp->if_softc;
carpdetach(ifp->if_softc);
ether_ifdetach(ifp);
if_detach(ifp);
callout_destroy(&sc->sc_ad_tmo);
callout_destroy(&sc->sc_md_tmo);
callout_destroy(&sc->sc_md6_tmo);
free(ifp->if_softc, M_DEVBUF);
return (0);
}
static void
carpdetach(struct carp_softc *sc)
{
struct ifnet *ifp;
struct carp_if *cif;
int s;
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);
sc->sc_if.if_flags &= ~IFF_UP;
carp_setrun(sc, 0);
carp_multicast_cleanup(sc);
KERNEL_LOCK(1, NULL);
s = splnet();
ifp = sc->sc_carpdev;
if (ifp != NULL) {
if_linkstate_change_disestablish(ifp,
sc->sc_linkstate_hook, NULL);
cif = (struct carp_if *)ifp->if_carp;
TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list);
if (!--cif->vhif_nvrs) {
ifpromisc(ifp, 0);
ifp->if_carp = NULL;
free(cif, M_IFADDR);
}
}
sc->sc_carpdev = NULL;
splx(s);
KERNEL_UNLOCK_ONE(NULL);
}
/* Detach an interface from the carp. */
void
carp_ifdetach(struct ifnet *ifp)
{
struct carp_softc *sc, *nextsc;
struct carp_if *cif = (struct carp_if *)ifp->if_carp;
for (sc = TAILQ_FIRST(&cif->vhif_vrs); sc; sc = nextsc) {
nextsc = TAILQ_NEXT(sc, sc_list);
carpdetach(sc);
}
}
static void
carp_prepare_ad(struct mbuf *m, struct carp_softc *sc,
struct carp_header *ch)
{
if (sc->sc_init_counter) {
/* this could also be seconds since unix epoch */
sc->sc_counter = cprng_fast64();
} else
sc->sc_counter++;
ch->carp_counter[0] = htonl((sc->sc_counter>>32)&0xffffffff);
ch->carp_counter[1] = htonl(sc->sc_counter&0xffffffff);
carp_hmac_generate(sc, ch->carp_counter, ch->carp_md);
}
static void
carp_send_ad_all(void)
{
struct ifnet *ifp;
struct carp_if *cif;
struct carp_softc *vh;
int s;
int bound = curlwp_bind();
s = pserialize_read_enter();
IFNET_READER_FOREACH(ifp) {
struct psref psref;
if (ifp->if_carp == NULL || ifp->if_type == IFT_CARP)
continue;
if_acquire(ifp, &psref);
pserialize_read_exit(s);
cif = (struct carp_if *)ifp->if_carp;
TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
if ((vh->sc_if.if_flags & (IFF_UP|IFF_RUNNING)) ==
(IFF_UP|IFF_RUNNING) && vh->sc_state == MASTER)
carp_send_ad(vh);
}
s = pserialize_read_enter();
if_release(ifp, &psref);
}
pserialize_read_exit(s);
curlwp_bindx(bound);
}
static void
carp_send_ad(void *v)
{
struct carp_header ch;
struct timeval tv;
struct carp_softc *sc = v;
struct carp_header *ch_ptr;
struct mbuf *m;
int error, len, advbase, advskew, s;
struct sockaddr sa;
KERNEL_LOCK(1, NULL);
s = splsoftnet();
advbase = advskew = 0; /* Sssssh compiler */
if (sc->sc_carpdev == NULL) {
if_statinc(&sc->sc_if, if_oerrors);
goto retry_later;
}
/* bow out if we've gone to backup (the carp interface is going down) */
if (sc->sc_bow_out) {
sc->sc_bow_out = 0;
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;
}
ch.carp_version = CARP_VERSION;
ch.carp_type = CARP_ADVERTISEMENT;
ch.carp_vhid = sc->sc_vhid;
ch.carp_advbase = advbase;
ch.carp_advskew = advskew;
ch.carp_authlen = 7; /* XXX DEFINE */
ch.carp_pad1 = 0; /* must be zero */
ch.carp_cksum = 0;
#ifdef INET
if (sc->sc_naddrs) {
struct ip *ip;
struct ifaddr *ifa;
int _s;
MGETHDR(m, M_DONTWAIT, MT_HEADER);
if (m == NULL) {
if_statinc(&sc->sc_if, if_oerrors);
CARP_STATINC(CARP_STAT_ONOMEM);
/* XXX maybe less ? */
goto retry_later;
}
MCLAIM(m, &carp_proto_mowner_tx);
len = sizeof(*ip) + sizeof(ch);
m->m_pkthdr.len = len;
m_reset_rcvif(m);
m->m_len = 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 = htons(len);
ip->ip_id = 0; /* no need for id, we don't support fragments */
ip->ip_off = htons(IP_DF);
ip->ip_ttl = CARP_DFLTTL;
ip->ip_p = IPPROTO_CARP;
ip->ip_sum = 0;
memset(&sa, 0, sizeof(sa));
sa.sa_family = AF_INET;
_s = pserialize_read_enter();
ifa = ifaof_ifpforaddr(&sa, sc->sc_carpdev);
if (ifa == NULL)
ip->ip_src.s_addr = 0;
else
ip->ip_src.s_addr =
ifatoia(ifa)->ia_addr.sin_addr.s_addr;
pserialize_read_exit(_s);
ip->ip_dst.s_addr = INADDR_CARP_GROUP;
ch_ptr = (struct carp_header *)(&ip[1]);
memcpy(ch_ptr, &ch, sizeof(ch));
carp_prepare_ad(m, sc, ch_ptr);
m->m_data += sizeof(*ip);
ch_ptr->carp_cksum = carp_cksum(m, len - sizeof(*ip));
m->m_data -= sizeof(*ip);
nanotime(&sc->sc_if.if_lastchange);
if_statadd2(&sc->sc_if, if_opackets, 1, if_obytes, len);
CARP_STATINC(CARP_STAT_OPACKETS);
error = ip_output(m, NULL, NULL, IP_RAWOUTPUT, &sc->sc_imo,
NULL);
if (error) {
if (error == ENOBUFS)
CARP_STATINC(CARP_STAT_ONOMEM);
else
CARP_LOG(sc, ("ip_output failed: %d", error));
if_statinc(&sc->sc_if, 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_send_ad_all();
}
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;
}
}
#endif /* INET */
#ifdef INET6
if (sc->sc_naddrs6) {
struct ip6_hdr *ip6;
struct ifaddr *ifa;
int _s;
MGETHDR(m, M_DONTWAIT, MT_HEADER);
if (m == NULL) {
if_statinc(&sc->sc_if, if_oerrors);
CARP_STATINC(CARP_STAT_ONOMEM);
/* XXX maybe less ? */
goto retry_later;
}
MCLAIM(m, &carp_proto6_mowner_tx);
len = sizeof(*ip6) + sizeof(ch);
m->m_pkthdr.len = len;
m_reset_rcvif(m);
m->m_len = len;
m_align(m, m->m_len);
m->m_flags |= M_MCAST;
ip6 = mtod(m, struct ip6_hdr *);
memset(ip6, 0, sizeof(*ip6));
ip6->ip6_vfc |= IPV6_VERSION;
ip6->ip6_hlim = CARP_DFLTTL;
ip6->ip6_nxt = IPPROTO_CARP;
/* set the source address */
memset(&sa, 0, sizeof(sa));
sa.sa_family = AF_INET6;
_s = pserialize_read_enter();
ifa = ifaof_ifpforaddr(&sa, sc->sc_carpdev);
if (ifa == NULL) /* This should never happen with IPv6 */
memset(&ip6->ip6_src, 0, sizeof(struct in6_addr));
else
bcopy(ifatoia6(ifa)->ia_addr.sin6_addr.s6_addr,
&ip6->ip6_src, sizeof(struct in6_addr));
pserialize_read_exit(_s);
/* 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_if, NULL) != 0) {
if_statinc(&sc->sc_if, if_oerrors);
m_freem(m);
CARP_LOG(sc, ("in6_setscope failed"));
goto retry_later;
}
ch_ptr = (struct carp_header *)(&ip6[1]);
memcpy(ch_ptr, &ch, sizeof(ch));
carp_prepare_ad(m, sc, ch_ptr);
ch_ptr->carp_cksum = carp6_cksum(m, sizeof(*ip6),
len - sizeof(*ip6));
nanotime(&sc->sc_if.if_lastchange);
if_statadd2(&sc->sc_if, if_opackets, 1, if_obytes, len);
CARP_STATINC(CARP_STAT_OPACKETS6);
error = ip6_output(m, NULL, NULL, 0, &sc->sc_im6o, NULL, NULL);
if (error) {
if (error == ENOBUFS)
CARP_STATINC(CARP_STAT_ONOMEM);
else
CARP_LOG(sc, ("ip6_output failed: %d", error));
if_statinc(&sc->sc_if, 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_send_ad_all();
}
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;
}
}
#endif /* INET6 */
retry_later:
splx(s);
KERNEL_UNLOCK_ONE(NULL);
if (advbase != 255 || advskew != 255)
callout_schedule(&sc->sc_ad_tmo, tvtohz(&tv));
}
/*
* Broadcast a gratuitous ARP request containing
* the virtual router MAC address for each IP address
* associated with the virtual router.
*/
static void
carp_send_arp(struct carp_softc *sc)
{
struct ifaddr *ifa;
int s, bound;
KERNEL_LOCK(1, NULL);
bound = curlwp_bind();
s = pserialize_read_enter();
IFADDR_READER_FOREACH(ifa, &sc->sc_if) {
struct psref psref;
if (ifa->ifa_addr->sa_family != AF_INET)
continue;
ifa_acquire(ifa, &psref);
pserialize_read_exit(s);
arpannounce(sc->sc_carpdev, ifa, CLLADDR(sc->sc_if.if_sadl));
s = pserialize_read_enter();
ifa_release(ifa, &psref);
}
pserialize_read_exit(s);
curlwp_bindx(bound);
KERNEL_UNLOCK_ONE(NULL);
}
#ifdef INET6
static void
carp_send_na(struct carp_softc *sc)
{
struct ifaddr *ifa;
struct in6_addr *in6;
static struct in6_addr mcast = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
int s, bound;
KERNEL_LOCK(1, NULL);
bound = curlwp_bind();
s = pserialize_read_enter();
IFADDR_READER_FOREACH(ifa, &sc->sc_if) {
struct psref psref;
if (ifa->ifa_addr->sa_family != AF_INET6)
continue;
ifa_acquire(ifa, &psref);
pserialize_read_exit(s);
in6 = &ifatoia6(ifa)->ia_addr.sin6_addr;
nd6_na_output(sc->sc_carpdev, &mcast, in6,
ND_NA_FLAG_OVERRIDE, 1, NULL);
s = pserialize_read_enter();
ifa_release(ifa, &psref);
}
pserialize_read_exit(s);
curlwp_bindx(bound);
KERNEL_UNLOCK_ONE(NULL);
}
#endif /* INET6 */
/*
* Based on bridge_hash() in if_bridge.c
*/
#define mix(a,b,c) \
do { \
a -= b; a -= c; a ^= (c >> 13); \
b -= c; b -= a; b ^= (a << 8); \
c -= a; c -= b; c ^= (b >> 13); \
a -= b; a -= c; a ^= (c >> 12); \
b -= c; b -= a; b ^= (a << 16); \
c -= a; c -= b; c ^= (b >> 5); \
a -= b; a -= c; a ^= (c >> 3); \
b -= c; b -= a; b ^= (a << 10); \
c -= a; c -= b; c ^= (b >> 15); \
} while (0)
static u_int32_t
carp_hash(struct carp_softc *sc, u_char *src)
{
u_int32_t a = 0x9e3779b9, b = sc->sc_hashkey[0], c = sc->sc_hashkey[1];
c += sc->sc_key[3] << 24;
c += sc->sc_key[2] << 16;
c += sc->sc_key[1] << 8;
c += sc->sc_key[0];
b += src[5] << 8;
b += src[4];
a += src[3] << 24;
a += src[2] << 16;
a += src[1] << 8;
a += src[0];
mix(a, b, c);
return (c);
}
static int
carp_addrcount(struct carp_if *cif, struct in_ifaddr *ia, int type)
{
struct carp_softc *vh;
struct ifaddr *ifa;
int count = 0;
TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
if ((type == CARP_COUNT_RUNNING &&
(vh->sc_if.if_flags & (IFF_UP|IFF_RUNNING)) ==
(IFF_UP|IFF_RUNNING)) ||
(type == CARP_COUNT_MASTER && vh->sc_state == MASTER)) {
int s = pserialize_read_enter();
IFADDR_READER_FOREACH(ifa, &vh->sc_if) {
if (ifa->ifa_addr->sa_family == AF_INET &&
ia->ia_addr.sin_addr.s_addr ==
ifatoia(ifa)->ia_addr.sin_addr.s_addr)
count++;
}
pserialize_read_exit(s);
}
}
return (count);
}
int
carp_iamatch(struct in_ifaddr *ia, u_char *src,
u_int32_t *count, u_int32_t index)
{
struct carp_softc *sc = ia->ia_ifp->if_softc;
if (carp_opts[CARPCTL_ARPBALANCE]) {
/*
* 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 the elegible carp interfaces with this address */
if (*count == 0)
*count = carp_addrcount(
(struct carp_if *)ia->ia_ifp->if_carpdev->if_carp,
ia, CARP_COUNT_RUNNING);
/* This should never happen, but... */
if (*count == 0)
return (0);
if (carp_hash(sc, src) % *count == index - 1 &&
sc->sc_state == MASTER) {
return (1);
}
} else {
if (sc->sc_state == MASTER)
return (1);
}
return (0);
}
#ifdef INET6
struct ifaddr *
carp_iamatch6(void *v, struct in6_addr *taddr)
{
struct carp_if *cif = v;
struct carp_softc *vh;
struct ifaddr *ifa;
TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
int s = pserialize_read_enter();
IFADDR_READER_FOREACH(ifa, &vh->sc_if) {
if (IN6_ARE_ADDR_EQUAL(taddr,
&ifatoia6(ifa)->ia_addr.sin6_addr) &&
((vh->sc_if.if_flags & (IFF_UP|IFF_RUNNING)) ==
(IFF_UP|IFF_RUNNING)) && vh->sc_state == MASTER)
return (ifa);
}
pserialize_read_exit(s);
}
return (NULL);
}
#endif /* INET6 */
struct ifnet *
carp_ourether(void *v, struct ether_header *eh, u_char iftype, int src)
{
struct carp_if *cif = (struct carp_if *)v;
struct carp_softc *vh;
u_int8_t *ena;
if (src)
ena = (u_int8_t *)&eh->ether_shost;
else
ena = (u_int8_t *)&eh->ether_dhost;
switch (iftype) {
case IFT_ETHER:
case IFT_FDDI:
if (ena[0] || ena[1] || ena[2] != 0x5e || ena[3] || ena[4] != 1)
return (NULL);
break;
case IFT_ISO88025:
if (ena[0] != 3 || ena[1] || ena[4] || ena[5])
return (NULL);
break;
default:
return (NULL);
break;
}
TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list)
if ((vh->sc_if.if_flags & (IFF_UP|IFF_RUNNING)) ==
(IFF_UP|IFF_RUNNING) && vh->sc_state == MASTER &&
!memcmp(ena, CLLADDR(vh->sc_if.if_sadl),
ETHER_ADDR_LEN)) {
return (&vh->sc_if);
}
return (NULL);
}
int
carp_input(struct mbuf *m, u_int8_t *shost, u_int8_t *dhost, u_int16_t etype)
{
struct ether_header eh;
struct carp_if *cif = (struct carp_if *)m_get_rcvif_NOMPSAFE(m)->if_carp;
struct ifnet *ifp;
memcpy(&eh.ether_shost, shost, sizeof(eh.ether_shost));
memcpy(&eh.ether_dhost, dhost, sizeof(eh.ether_dhost));
eh.ether_type = etype;
if (m->m_flags & (M_BCAST|M_MCAST)) {
struct carp_softc *vh;
struct mbuf *m0;
/*
* XXX Should really check the list of multicast addresses
* for each CARP interface _before_ copying.
*/
TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
m0 = m_copym(m, 0, M_COPYALL, M_DONTWAIT);
if (m0 == NULL)
continue;
m_set_rcvif(m0, &vh->sc_if);
ether_input(&vh->sc_if, m0);
}
return (1);
}
ifp = carp_ourether(cif, &eh, m_get_rcvif_NOMPSAFE(m)->if_type, 0);
if (ifp == NULL) {
return (1);
}
m_set_rcvif(m, ifp);
bpf_mtap(ifp, m, BPF_D_IN);
if_statinc(ifp, if_ipackets);
ether_input(ifp, m);
return (0);
}
static void
carp_master_down(void *v)
{
struct carp_softc *sc = v;
switch (sc->sc_state) {
case INIT:
printf("%s: master_down event in INIT state\n",
sc->sc_if.if_xname);
break;
case MASTER:
break;
case BACKUP:
CARP_LOG(sc, ("INIT -> MASTER (preempting)"));
carp_set_state(sc, MASTER);
carp_send_ad(sc);
carp_send_arp(sc);
#ifdef INET6
carp_send_na(sc);
#endif /* INET6 */
carp_setrun(sc, 0);
carp_setroute(sc, RTM_ADD);
break;
}
}
/*
* When in backup state, af indicates whether to reset the master down timer
* for v4 or v6. If it's set to zero, reset the ones which are already pending.
*/
static void
carp_setrun(struct carp_softc *sc, sa_family_t af)
{
struct timeval tv;
if (sc->sc_carpdev == NULL) {
sc->sc_if.if_flags &= ~IFF_RUNNING;
carp_set_state(sc, INIT);
return;
}
if (sc->sc_if.if_flags & IFF_UP && sc->sc_vhid > 0 &&
(sc->sc_naddrs || sc->sc_naddrs6) && !sc->sc_suppress) {
sc->sc_if.if_flags |= IFF_RUNNING;
} else {
sc->sc_if.if_flags &= ~IFF_RUNNING;
carp_setroute(sc, RTM_DELETE);
return;
}
switch (sc->sc_state) {
case INIT:
carp_set_state(sc, BACKUP);
carp_setroute(sc, RTM_DELETE);
carp_setrun(sc, 0);
break;
case BACKUP:
callout_stop(&sc->sc_ad_tmo);
tv.tv_sec = 3 * sc->sc_advbase;
tv.tv_usec = sc->sc_advskew * 1000000 / 256;
switch (af) {
#ifdef INET
case AF_INET:
callout_schedule(&sc->sc_md_tmo, tvtohz(&tv));
break;
#endif /* INET */
#ifdef INET6
case AF_INET6:
callout_schedule(&sc->sc_md6_tmo, tvtohz(&tv));
break;
#endif /* INET6 */
default:
if (sc->sc_naddrs)
callout_schedule(&sc->sc_md_tmo, tvtohz(&tv));
#ifdef INET6
if (sc->sc_naddrs6)
callout_schedule(&sc->sc_md6_tmo, tvtohz(&tv));
#endif /* INET6 */
break;
}
break;
case MASTER:
tv.tv_sec = sc->sc_advbase;
tv.tv_usec = sc->sc_advskew * 1000000 / 256;
callout_schedule(&sc->sc_ad_tmo, tvtohz(&tv));
break;
}
}
static void
carp_multicast_cleanup(struct carp_softc *sc)
{
struct ip_moptions *imo = &sc->sc_imo;
#ifdef INET6
struct ip6_moptions *im6o = &sc->sc_im6o;
#endif
u_int16_t n = imo->imo_num_memberships;
/* Clean up our own multicast memberships */
while (n-- > 0) {
if (imo->imo_membership[n] != NULL) {
in_delmulti(imo->imo_membership[n]);
imo->imo_membership[n] = NULL;
}
}
imo->imo_num_memberships = 0;
imo->imo_multicast_if_index = 0;
#ifdef INET6
while (!LIST_EMPTY(&im6o->im6o_memberships)) {
struct in6_multi_mship *imm =
LIST_FIRST(&im6o->im6o_memberships);
LIST_REMOVE(imm, i6mm_chain);
in6_leavegroup(imm);
}
im6o->im6o_multicast_if_index = 0;
#endif
/* And any other multicast memberships */
carp_ether_purgemulti(sc);
}
static int
carp_set_ifp(struct carp_softc *sc, struct ifnet *ifp)
{
struct carp_if *cif, *ncif = NULL;
struct carp_softc *vr, *after = NULL;
int myself = 0, error = 0;
int s;
if (ifp == sc->sc_carpdev)
return (0);
if (ifp != NULL) {
if ((ifp->if_flags & IFF_MULTICAST) == 0)
return (EADDRNOTAVAIL);
if (ifp->if_type == IFT_CARP)
return (EINVAL);
if (ifp->if_carp == NULL) {
ncif = malloc(sizeof(*cif), M_IFADDR, M_WAITOK);
if ((error = ifpromisc(ifp, 1))) {
free(ncif, M_IFADDR);
return (error);
}
ncif->vhif_ifp = ifp;
TAILQ_INIT(&ncif->vhif_vrs);
} else {
cif = (struct carp_if *)ifp->if_carp;
TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list)
if (vr != sc && vr->sc_vhid == sc->sc_vhid)
return (EINVAL);
}
/* detach from old interface */
if (sc->sc_carpdev != NULL)
carpdetach(sc);
/* join multicast groups */
if (sc->sc_naddrs < 0 &&
(error = carp_join_multicast(sc)) != 0) {
if (ncif != NULL)
free(ncif, M_IFADDR);
return (error);
}
#ifdef INET6
if (sc->sc_naddrs6 < 0 &&
(error = carp_join_multicast6(sc)) != 0) {
if (ncif != NULL)
free(ncif, M_IFADDR);
carp_multicast_cleanup(sc);
return (error);
}
#endif
/* attach carp interface to physical interface */
if (ncif != NULL)
ifp->if_carp = (void *)ncif;
sc->sc_carpdev = ifp;
sc->sc_if.if_capabilities = ifp->if_capabilities &
(IFCAP_TSOv4 | IFCAP_TSOv6 |
IFCAP_CSUM_IPv4_Tx|IFCAP_CSUM_IPv4_Rx|
IFCAP_CSUM_TCPv4_Tx|IFCAP_CSUM_TCPv4_Rx|
IFCAP_CSUM_UDPv4_Tx|IFCAP_CSUM_UDPv4_Rx|
IFCAP_CSUM_TCPv6_Tx|IFCAP_CSUM_TCPv6_Rx|
IFCAP_CSUM_UDPv6_Tx|IFCAP_CSUM_UDPv6_Rx);
cif = (struct carp_if *)ifp->if_carp;
TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) {
if (vr == sc)
myself = 1;
if (vr->sc_vhid < sc->sc_vhid)
after = vr;
}
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_naddrs || sc->sc_naddrs6)
sc->sc_if.if_flags |= IFF_UP;
carp_set_enaddr(sc);
sc->sc_linkstate_hook = if_linkstate_change_establish(ifp,
carp_carpdev_state, (void *)ifp);
KERNEL_LOCK(1, NULL);
s = splnet();
carp_carpdev_state(ifp);
splx(s);
KERNEL_UNLOCK_ONE(NULL);
} else {
carpdetach(sc);
sc->sc_if.if_flags &= ~(IFF_UP|IFF_RUNNING);
}
return (0);
}
static void
carp_set_enaddr(struct carp_softc *sc)
{
struct ifnet *ifp = &sc->sc_if;
uint8_t enaddr[ETHER_ADDR_LEN];
if (sc->sc_vhid == -1) {
ifp->if_addrlen = 0;
if_alloc_sadl(ifp);
return;
}
if (sc->sc_carpdev && sc->sc_carpdev->if_type == IFT_ISO88025) {
enaddr[0] = 3;
enaddr[1] = 0;
enaddr[2] = 0x40 >> (sc->sc_vhid - 1);
enaddr[3] = 0x40000 >> (sc->sc_vhid - 1);
enaddr[4] = 0;
enaddr[5] = 0;
} else {
enaddr[0] = 0;
enaddr[1] = 0;
enaddr[2] = 0x5e;
enaddr[3] = 0;
enaddr[4] = 1;
enaddr[5] = sc->sc_vhid;
}
if_set_sadl(ifp, enaddr, sizeof(enaddr), false);
}
#if 0
static void
carp_addr_updated(void *v)
{
struct carp_softc *sc = (struct carp_softc *) v;
struct ifaddr *ifa;
int new_naddrs = 0, new_naddrs6 = 0;
IFADDR_READER_FOREACH(ifa, &sc->sc_if) {
if (ifa->ifa_addr->sa_family == AF_INET)
new_naddrs++;
else if (ifa->ifa_addr->sa_family == AF_INET6)
new_naddrs6++;
}
/* Handle a callback after SIOCDIFADDR */
if (new_naddrs < sc->sc_naddrs || new_naddrs6 < sc->sc_naddrs6) {
struct in_addr mc_addr;
sc->sc_naddrs = new_naddrs;
sc->sc_naddrs6 = new_naddrs6;
/* Re-establish multicast membership removed by in_control */
mc_addr.s_addr = INADDR_CARP_GROUP;
if (!in_multi_group(mc_addr, &sc->sc_if, 0)) {
memset(&sc->sc_imo, 0, sizeof(sc->sc_imo));
if (sc->sc_carpdev != NULL && sc->sc_naddrs > 0)
carp_join_multicast(sc);
}
if (sc->sc_naddrs == 0 && sc->sc_naddrs6 == 0) {
sc->sc_if.if_flags &= ~IFF_UP;
carp_set_state(sc, INIT);
} else
carp_hmac_prepare(sc);
}
carp_setrun(sc, 0);
}
#endif
static int
carp_set_addr(struct carp_softc *sc, struct sockaddr_in *sin)
{
struct ifnet *ifp = sc->sc_carpdev;
struct in_ifaddr *ia, *ia_if;
int error = 0;
int s;
if (sin->sin_addr.s_addr == 0) {
if (!(sc->sc_if.if_flags & IFF_UP))
carp_set_state(sc, INIT);
if (sc->sc_naddrs)
sc->sc_if.if_flags |= IFF_UP;
carp_setrun(sc, 0);
return (0);
}
/* we have to do this by hand to ensure we don't match on ourselves */
ia_if = NULL;
s = pserialize_read_enter();
IN_ADDRLIST_READER_FOREACH(ia) {
/* and, yeah, we need a multicast-capable iface too */
if (ia->ia_ifp != &sc->sc_if &&
ia->ia_ifp->if_type != IFT_CARP &&
(ia->ia_ifp->if_flags & IFF_MULTICAST) &&
(sin->sin_addr.s_addr & ia->ia_subnetmask) ==
ia->ia_subnet) {
if (!ia_if)
ia_if = ia;
}
}
if (ia_if) {
ia = ia_if;
if (ifp) {
if (ifp != ia->ia_ifp)
return (EADDRNOTAVAIL);
} else {
/* FIXME NOMPSAFE */
ifp = ia->ia_ifp;
}
}
pserialize_read_exit(s);
if ((error = carp_set_ifp(sc, ifp)))
return (error);
if (sc->sc_carpdev == NULL)
return (EADDRNOTAVAIL);
if (sc->sc_naddrs == 0 && (error = carp_join_multicast(sc)) != 0)
return (error);
sc->sc_naddrs++;
if (sc->sc_carpdev != NULL)
sc->sc_if.if_flags |= IFF_UP;
carp_set_state(sc, INIT);
carp_setrun(sc, 0);
/*
* Hook if_addrhooks so that we get a callback after in_ifinit has run,
* to correct any inappropriate routes that it inserted.
*/
if (sc->ah_cookie == 0) {
/* XXX link address hook */
}
return (0);
}
static int
carp_join_multicast(struct carp_softc *sc)
{
struct ip_moptions *imo = &sc->sc_imo, tmpimo;
struct in_addr addr;
memset(&tmpimo, 0, sizeof(tmpimo));
addr.s_addr = INADDR_CARP_GROUP;
if ((tmpimo.imo_membership[0] =
in_addmulti(&addr, &sc->sc_if)) == NULL) {
return (ENOBUFS);
}
imo->imo_membership[0] = tmpimo.imo_membership[0];
imo->imo_num_memberships = 1;
imo->imo_multicast_if_index = sc->sc_if.if_index;
imo->imo_multicast_ttl = CARP_DFLTTL;
imo->imo_multicast_loop = 0;
return (0);
}
#ifdef INET6
static int
carp_set_addr6(struct carp_softc *sc, struct sockaddr_in6 *sin6)
{
struct ifnet *ifp = sc->sc_carpdev;
struct in6_ifaddr *ia, *ia_if;
int error = 0;
int s;
if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
if (!(sc->sc_if.if_flags & IFF_UP))
carp_set_state(sc, INIT);
if (sc->sc_naddrs6)
sc->sc_if.if_flags |= IFF_UP;
carp_setrun(sc, 0);
return (0);
}
/* we have to do this by hand to ensure we don't match on ourselves */
ia_if = NULL;
s = pserialize_read_enter();
IN6_ADDRLIST_READER_FOREACH(ia) {
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 != &sc->sc_if &&
ia->ia_ifp->if_type != IFT_CARP &&
(ia->ia_ifp->if_flags & IFF_MULTICAST) &&
(i == 4)) {
if (!ia_if)
ia_if = ia;
}
}
pserialize_read_exit(s);
if (ia_if) {
ia = ia_if;
if (sc->sc_carpdev) {
if (sc->sc_carpdev != ia->ia_ifp)
return (EADDRNOTAVAIL);
} else {
ifp = ia->ia_ifp;
}
}
if ((error = carp_set_ifp(sc, ifp)))
return (error);
if (sc->sc_carpdev == NULL)
return (EADDRNOTAVAIL);
if (sc->sc_naddrs6 == 0 && (error = carp_join_multicast6(sc)) != 0)
return (error);
sc->sc_naddrs6++;
if (sc->sc_carpdev != NULL)
sc->sc_if.if_flags |= IFF_UP;
carp_set_state(sc, INIT);
carp_setrun(sc, 0);
return (0);
}
static int
carp_join_multicast6(struct carp_softc *sc)
{
struct in6_multi_mship *imm, *imm2;
struct ip6_moptions *im6o = &sc->sc_im6o;
struct sockaddr_in6 addr6;
int error;
/* Join IPv6 CARP multicast group */
memset(&addr6, 0, sizeof(addr6));
addr6.sin6_family = AF_INET6;
addr6.sin6_len = sizeof(addr6);
addr6.sin6_addr.s6_addr16[0] = htons(0xff02);
addr6.sin6_addr.s6_addr16[1] = htons(sc->sc_if.if_index);
addr6.sin6_addr.s6_addr8[15] = 0x12;
if ((imm = in6_joingroup(&sc->sc_if,
&addr6.sin6_addr, &error, 0)) == NULL) {
return (error);
}
/* join solicited multicast address */
memset(&addr6.sin6_addr, 0, sizeof(addr6.sin6_addr));
addr6.sin6_addr.s6_addr16[0] = htons(0xff02);
addr6.sin6_addr.s6_addr16[1] = htons(sc->sc_if.if_index);
addr6.sin6_addr.s6_addr32[1] = 0;
addr6.sin6_addr.s6_addr32[2] = htonl(1);
addr6.sin6_addr.s6_addr32[3] = 0;
addr6.sin6_addr.s6_addr8[12] = 0xff;
if ((imm2 = in6_joingroup(&sc->sc_if,
&addr6.sin6_addr, &error, 0)) == NULL) {
in6_leavegroup(imm);
return (error);
}
/* apply v6 multicast membership */
im6o->im6o_multicast_if_index = sc->sc_if.if_index;
if (imm)
LIST_INSERT_HEAD(&im6o->im6o_memberships, imm,
i6mm_chain);
if (imm2)
LIST_INSERT_HEAD(&im6o->im6o_memberships, imm2,
i6mm_chain);
return (0);
}
#endif /* INET6 */
static int
carp_ioctl(struct ifnet *ifp, u_long cmd, void *data)
{
struct lwp *l = curlwp; /* XXX */
struct carp_softc *sc = ifp->if_softc, *vr;
struct carpreq carpr;
struct ifaddr *ifa;
struct ifreq *ifr;
struct ifnet *cdev = NULL;
int error = 0;
ifa = (struct ifaddr *)data;
ifr = (struct ifreq *)data;
switch (cmd) {
case SIOCINITIFADDR:
switch (ifa->ifa_addr->sa_family) {
#ifdef INET
case AF_INET:
sc->sc_if.if_flags |= IFF_UP;
memcpy(ifa->ifa_dstaddr, ifa->ifa_addr,
sizeof(struct sockaddr));
error = carp_set_addr(sc, satosin(ifa->ifa_addr));
break;
#endif /* INET */
#ifdef INET6
case AF_INET6:
sc->sc_if.if_flags|= IFF_UP;
error = carp_set_addr6(sc, satosin6(ifa->ifa_addr));
break;
#endif /* INET6 */
default:
error = EAFNOSUPPORT;
break;
}
break;
case SIOCSIFFLAGS:
if ((error = ifioctl_common(ifp, cmd, data)) != 0)
break;
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) {
/* we need the interface up to bow out */
sc->sc_if.if_flags |= IFF_UP;
sc->sc_bow_out = 1;
carp_send_ad(sc);
}
sc->sc_if.if_flags &= ~IFF_UP;
carp_set_state(sc, INIT);
carp_setrun(sc, 0);
} else if (sc->sc_state == INIT && (ifr->ifr_flags & IFF_UP)) {
sc->sc_if.if_flags |= IFF_UP;
carp_setrun(sc, 0);
}
carp_update_link_state(sc);
break;
case SIOCSVH:
if (l == NULL)
break;
if ((error = kauth_authorize_network(l->l_cred,
KAUTH_NETWORK_INTERFACE,
KAUTH_REQ_NETWORK_INTERFACE_SETPRIV, ifp, (void *)cmd,
NULL)) != 0)
break;
if ((error = copyin(ifr->ifr_data, &carpr, sizeof carpr)))
break;
error = 1;
if (carpr.carpr_carpdev[0] != '\0' &&
(cdev = ifunit(carpr.carpr_carpdev)) == NULL)
return (EINVAL);
if ((error = carp_set_ifp(sc, cdev)))
return (error);
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_setrun(sc, 0);
carp_setroute(sc, RTM_DELETE);
break;
case MASTER:
carp_master_down(sc);
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)
return (EINVAL);
}
sc->sc_vhid = carpr.carpr_vhid;
carp_set_enaddr(sc);
carp_set_state(sc, INIT);
error--;
}
if (carpr.carpr_advbase > 0 || carpr.carpr_advskew > 0) {
if (carpr.carpr_advskew > 254) {
error = EINVAL;
break;
}
if (carpr.carpr_advbase > 255) {
error = EINVAL;
break;
}
sc->sc_advbase = carpr.carpr_advbase;
sc->sc_advskew = carpr.carpr_advskew;
error--;
}
memcpy(sc->sc_key, carpr.carpr_key, sizeof(sc->sc_key));
if (error > 0)
error = EINVAL;
else {
error = 0;
carp_setrun(sc, 0);
}
break;
case SIOCGVH:
memset(&carpr, 0, sizeof(carpr));
if (sc->sc_carpdev != NULL)
strlcpy(carpr.carpr_carpdev, sc->sc_carpdev->if_xname,
IFNAMSIZ);
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 ((l != NULL) && (error = kauth_authorize_network(l->l_cred,
KAUTH_NETWORK_INTERFACE,
KAUTH_REQ_NETWORK_INTERFACE_SETPRIV, ifp, (void *)cmd,
NULL)) == 0)
memcpy(carpr.carpr_key, sc->sc_key,
sizeof(carpr.carpr_key));
error = copyout(&carpr, ifr->ifr_data, sizeof(carpr));
break;
case SIOCADDMULTI:
error = carp_ether_addmulti(sc, ifr);
break;
case SIOCDELMULTI:
error = carp_ether_delmulti(sc, ifr);
break;
case SIOCSIFCAP:
if ((error = ifioctl_common(ifp, cmd, data)) == ENETRESET)
error = 0;
break;
default:
error = ether_ioctl(ifp, cmd, data);
}
carp_hmac_prepare(sc);
return (error);
}
/*
* 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
}
int
carp_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *sa,
const struct rtentry *rt)
{
struct carp_softc *sc = ((struct carp_softc *)ifp->if_softc);
KASSERT(KERNEL_LOCKED_P());
if (sc->sc_carpdev != NULL && sc->sc_state == MASTER) {
return if_output_lock(sc->sc_carpdev, ifp, m, sa, rt);
} else {
m_freem(m);
return (ENETUNREACH);
}
}
static void
carp_set_state(struct carp_softc *sc, int state)
{
static const char *carp_states[] = { CARP_STATES };
if (sc->sc_state == state)
return;
CARP_LOG(sc, ("state transition from: %s -> to: %s", carp_states[sc->sc_state], carp_states[state]));
sc->sc_state = state;
carp_update_link_state(sc);
}
static void
carp_update_link_state(struct carp_softc *sc)
{
int link_state;
switch (sc->sc_state) {
case BACKUP:
link_state = LINK_STATE_DOWN;
break;
case MASTER:
link_state = LINK_STATE_UP;
break;
default:
/* Not useable, so down makes perfect sense. */
link_state = LINK_STATE_DOWN;
break;
}
if_link_state_change(&sc->sc_if, link_state);
}
void
carp_carpdev_state(void *v)
{
struct carp_if *cif;
struct carp_softc *sc;
struct ifnet *ifp = v;
if (ifp->if_type == IFT_CARP)
return;
cif = (struct carp_if *)ifp->if_carp;
TAILQ_FOREACH(sc, &cif->vhif_vrs, sc_list) {
int suppressed = sc->sc_suppress;
if (sc->sc_carpdev->if_link_state == LINK_STATE_DOWN ||
!(sc->sc_carpdev->if_flags & IFF_UP)) {
sc->sc_if.if_flags &= ~IFF_RUNNING;
callout_stop(&sc->sc_ad_tmo);
callout_stop(&sc->sc_md_tmo);
callout_stop(&sc->sc_md6_tmo);
carp_set_state(sc, INIT);
sc->sc_suppress = 1;
carp_setrun(sc, 0);
if (!suppressed) {
carp_suppress_preempt++;
if (carp_suppress_preempt == 1)
carp_send_ad_all();
}
} else {
carp_set_state(sc, INIT);
sc->sc_suppress = 0;
carp_setrun(sc, 0);
if (suppressed)
carp_suppress_preempt--;
}
}
}
static int
carp_ether_addmulti(struct carp_softc *sc, struct ifreq *ifr)
{
const struct sockaddr *sa = ifreq_getaddr(SIOCADDMULTI, ifr);
struct ifnet *ifp;
struct carp_mc_entry *mc;
u_int8_t addrlo[ETHER_ADDR_LEN], addrhi[ETHER_ADDR_LEN];
int error;
ifp = sc->sc_carpdev;
if (ifp == NULL)
return (EINVAL);
error = ether_addmulti(sa, &sc->sc_ac);
if (error != ENETRESET)
return (error);
/*
* This is new multicast address. We have to tell parent
* about it. Also, remember this multicast address so that
* we can delete them on unconfigure.
*/
mc = malloc(sizeof(struct carp_mc_entry), M_DEVBUF, M_NOWAIT);
if (mc == NULL) {
error = ENOMEM;
goto alloc_failed;
}
/*
* As ether_addmulti() returns ENETRESET, following two
* statement shouldn't fail.
*/
(void)ether_multiaddr(sa, addrlo, addrhi);
ETHER_LOCK(&sc->sc_ac);
mc->mc_enm = ether_lookup_multi(addrlo, addrhi, &sc->sc_ac);
ETHER_UNLOCK(&sc->sc_ac);
memcpy(&mc->mc_addr, sa, sa->sa_len);
LIST_INSERT_HEAD(&sc->carp_mc_listhead, mc, mc_entries);
error = if_mcast_op(ifp, SIOCADDMULTI, sa);
if (error != 0)
goto ioctl_failed;
return (error);
ioctl_failed:
LIST_REMOVE(mc, mc_entries);
free(mc, M_DEVBUF);
alloc_failed:
(void)ether_delmulti(sa, &sc->sc_ac);
return (error);
}
static int
carp_ether_delmulti(struct carp_softc *sc, struct ifreq *ifr)
{
const struct sockaddr *sa = ifreq_getaddr(SIOCDELMULTI, ifr);
struct ifnet *ifp;
struct ether_multi *enm;
struct carp_mc_entry *mc;
u_int8_t addrlo[ETHER_ADDR_LEN], addrhi[ETHER_ADDR_LEN];
int error;
ifp = sc->sc_carpdev;
if (ifp == NULL)
return (EINVAL);
/*
* Find a key to lookup carp_mc_entry. We have to do this
* before calling ether_delmulti for obvious reason.
*/
if ((error = ether_multiaddr(sa, addrlo, addrhi)) != 0)
return (error);
ETHER_LOCK(&sc->sc_ac);
enm = ether_lookup_multi(addrlo, addrhi, &sc->sc_ac);
ETHER_UNLOCK(&sc->sc_ac);
if (enm == NULL)
return (EINVAL);
LIST_FOREACH(mc, &sc->carp_mc_listhead, mc_entries)
if (mc->mc_enm == enm)
break;
/* We won't delete entries we didn't add */
if (mc == NULL)
return (EINVAL);
error = ether_delmulti(sa, &sc->sc_ac);
if (error != ENETRESET)
return (error);
/* We no longer use this multicast address. Tell parent so. */
error = if_mcast_op(ifp, SIOCDELMULTI, sa);
if (error == 0) {
/* And forget about this address. */
LIST_REMOVE(mc, mc_entries);
free(mc, M_DEVBUF);
} else
(void)ether_addmulti(sa, &sc->sc_ac);
return (error);
}
/*
* Delete any multicast address we have asked to add from parent
* interface. Called when the carp is being unconfigured.
*/
static void
carp_ether_purgemulti(struct carp_softc *sc)
{
struct ifnet *ifp = sc->sc_carpdev; /* Parent. */
struct carp_mc_entry *mc;
if (ifp == NULL)
return;
while ((mc = LIST_FIRST(&sc->carp_mc_listhead)) != NULL) {
(void)if_mcast_op(ifp, SIOCDELMULTI, sstosa(&mc->mc_addr));
LIST_REMOVE(mc, mc_entries);
free(mc, M_DEVBUF);
}
}
static int
sysctl_net_inet_carp_stats(SYSCTLFN_ARGS)
{
return (NETSTAT_SYSCTL(carpstat_percpu, CARP_NSTATS));
}
void
carp_init(void)
{
sysctl_net_inet_carp_setup(NULL);
#ifdef MBUFTRACE
MOWNER_ATTACH(&carp_proto_mowner_rx);
MOWNER_ATTACH(&carp_proto_mowner_tx);
MOWNER_ATTACH(&carp_proto6_mowner_rx);
MOWNER_ATTACH(&carp_proto6_mowner_tx);
#endif
carp_wqinput = wqinput_create("carp", _carp_proto_input);
#ifdef INET6
carp6_wqinput = wqinput_create("carp6", _carp6_proto_input);
#endif
}
static void
sysctl_net_inet_carp_setup(struct sysctllog **clog)
{
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT,
CTLTYPE_NODE, "inet", NULL,
NULL, 0, NULL, 0,
CTL_NET, PF_INET, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT,
CTLTYPE_NODE, "carp",
SYSCTL_DESCR("CARP related settings"),
NULL, 0, NULL, 0,
CTL_NET, PF_INET, IPPROTO_CARP, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "preempt",
SYSCTL_DESCR("Enable CARP Preempt"),
NULL, 0, &carp_opts[CARPCTL_PREEMPT], 0,
CTL_NET, PF_INET, IPPROTO_CARP,
CTL_CREATE, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "arpbalance",
SYSCTL_DESCR("Enable ARP balancing"),
NULL, 0, &carp_opts[CARPCTL_ARPBALANCE], 0,
CTL_NET, PF_INET, IPPROTO_CARP,
CTL_CREATE, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "allow",
SYSCTL_DESCR("Enable CARP"),
NULL, 0, &carp_opts[CARPCTL_ALLOW], 0,
CTL_NET, PF_INET, IPPROTO_CARP,
CTL_CREATE, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "log",
SYSCTL_DESCR("CARP logging"),
NULL, 0, &carp_opts[CARPCTL_LOG], 0,
CTL_NET, PF_INET, IPPROTO_CARP,
CTL_CREATE, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT,
CTLTYPE_STRUCT, "stats",
SYSCTL_DESCR("CARP statistics"),
sysctl_net_inet_carp_stats, 0, NULL, 0,
CTL_NET, PF_INET, IPPROTO_CARP, CARPCTL_STATS,
CTL_EOL);
}
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