File: [local] / sys / netinet / ip_carp.c (download)
Revision 1.1.1.1 (vendor branch), Tue Mar 4 16:15:43 2008 UTC (16 years, 4 months ago) by nbrk
Branch: OPENBSD_4_2_BASE, MAIN
CVS Tags: jornada-partial-support-wip, HEAD Changes since 1.1: +0 -0 lines
Import of OpenBSD 4.2 release kernel tree with initial code to support
Jornada 720/728, StrongARM 1110-based handheld PC.
At this point kernel roots on NFS and boots into vfs_mountroot() and traps.
What is supported:
- glass console, Jornada framebuffer (jfb) works in 16bpp direct color mode
(needs some palette tweaks for non black/white/blue colors, i think)
- saic, SA11x0 interrupt controller (needs cleanup)
- sacom, SA11x0 UART (supported only as boot console for now)
- SA11x0 GPIO controller fully supported (but can't handle multiple interrupt
handlers on one gpio pin)
- sassp, SSP port on SA11x0 that attaches spibus
- Jornada microcontroller (jmcu) to control kbd, battery, etc throught
the SPI bus (wskbd attaches on jmcu, but not tested)
- tod functions seem work
- initial code for SA-1111 (chip companion) : this is TODO
Next important steps, i think:
- gpio and intc on sa1111
- pcmcia support for sa11x0 (and sa1111 help logic)
- REAL root on nfs when we have PCMCIA support (we may use any of supported pccard NICs)
- root on wd0! (using already supported PCMCIA-ATA)
|
/* $OpenBSD: ip_carp.c,v 1.147 2007/06/23 16:15:26 reyk 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.
*/
/*
* TODO:
* - iface reconfigure
* - support for hardware checksum calculations;
*
*/
#include "ether.h"
#include <sys/param.h>
#include <sys/proc.h>
#include <sys/systm.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/ioctl.h>
#include <sys/errno.h>
#include <sys/device.h>
#include <sys/kernel.h>
#include <sys/sysctl.h>
#include <sys/syslog.h>
#include <machine/cpu.h>
#include <net/if.h>
#include <net/if_types.h>
#include <net/if_llc.h>
#include <net/route.h>
#include <net/netisr.h>
/* for arc4random() */
#include <dev/rndvar.h>
#if NFDDI > 0
#include <net/if_fddi.h>
#endif
#include <crypto/sha1.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 <netinet/if_ether.h>
#include <netinet/ip_ipsp.h>
#include <net/if_enc.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/in6_ifattach.h>
#endif
#include "bpfilter.h"
#if NBPFILTER > 0
#include <net/bpf.h>
#endif
#include <netinet/ip_carp.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
enum { HMAC_ORIG=0, HMAC_NOV6LL=1, HMAC_MAX=2 };
struct carp_softc {
struct arpcom sc_ac;
#define sc_if sc_ac.ac_if
#define sc_carpdev sc_ac.ac_if.if_carpdev
void *ah_cookie;
void *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
char sc_carplladdr[ETHER_ADDR_LEN];
char sc_curlladdr[ETHER_ADDR_LEN];
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[HMAC_MAX];
u_int32_t sc_hashkey[2];
u_int32_t sc_lsmask; /* load sharing mask */
int sc_lscount; /* # load sharing interfaces (max 32) */
struct timeout sc_ad_tmo; /* advertisement timeout */
struct timeout sc_md_tmo; /* master down timeout */
struct timeout sc_md6_tmo; /* master down timeout */
int sc_delayed_arp; /* delayed ARP request countdown */
LIST_HEAD(__carp_mchead, carp_mc_entry) carp_mc_listhead;
};
int carp_opts[CARPCTL_MAXID] = { 0, 1, 0, 0, 0 }; /* XXX for now */
struct carpstats carpstats;
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"); \
}
void carp_hmac_prepare(struct carp_softc *);
void carp_hmac_prepare_ctx(struct carp_softc *, u_int8_t);
void carp_hmac_generate(struct carp_softc *, u_int32_t *,
unsigned char *, u_int8_t);
int carp_hmac_verify(struct carp_softc *, u_int32_t *,
unsigned char *);
void carp_setroute(struct carp_softc *, int);
void carp_proto_input_c(struct mbuf *, struct carp_header *, sa_family_t);
void carpattach(int);
void carpdetach(struct carp_softc *);
int carp_prepare_ad(struct mbuf *, struct carp_softc *,
struct carp_header *);
void carp_send_ad_all(void);
void carp_send_ad(void *);
void carp_send_arp(struct carp_softc *);
void carp_master_down(void *);
int carp_ioctl(struct ifnet *, u_long, caddr_t);
void carp_ifgroup_ioctl(struct ifnet *, u_long, caddr_t);
void carp_ifgattr_ioctl(struct ifnet *, u_long, caddr_t);
void carp_start(struct ifnet *);
void carp_setrun(struct carp_softc *, sa_family_t);
void carp_set_state(struct carp_softc *, int);
int carp_addrcount(struct carp_if *, struct ifaddr *, int);
enum { CARP_COUNT_MASTER, CARP_COUNT_RUNNING, CARP_COUNT_LINK0 };
void carp_multicast_cleanup(struct carp_softc *);
int carp_set_ifp(struct carp_softc *, struct ifnet *);
void carp_set_enaddr(struct carp_softc *);
void carp_addr_updated(void *);
u_int32_t carp_hash(struct carp_softc *, u_char *);
int carp_set_addr(struct carp_softc *, struct sockaddr_in *);
int carp_join_multicast(struct carp_softc *);
#ifdef INET6
void carp_send_na(struct carp_softc *);
int carp_set_addr6(struct carp_softc *, struct sockaddr_in6 *);
int carp_join_multicast6(struct carp_softc *);
#endif
int carp_clone_create(struct if_clone *, int);
int carp_clone_destroy(struct ifnet *);
int carp_ether_addmulti(struct carp_softc *, struct ifreq *);
int carp_ether_delmulti(struct carp_softc *, struct ifreq *);
void carp_ether_purgemulti(struct carp_softc *);
int carp_group_demote_count(struct carp_softc *);
void carp_update_lsmask(struct carp_softc *);
struct if_clone carp_cloner =
IF_CLONE_INITIALIZER("carp", carp_clone_create, carp_clone_destroy);
#define carp_cksum(_m, _l) ((u_int16_t)in_cksum((_m), (_l)))
void
carp_hmac_prepare(struct carp_softc *sc)
{
u_int8_t i;
for (i=0; i < HMAC_MAX; i++)
carp_hmac_prepare_ctx(sc, i);
}
void
carp_hmac_prepare_ctx(struct carp_softc *sc, u_int8_t ctx)
{
u_int8_t 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 */
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 */
SHA1Init(&sc->sc_sha1[ctx]);
SHA1Update(&sc->sc_sha1[ctx], sc->sc_pad, sizeof(sc->sc_pad));
SHA1Update(&sc->sc_sha1[ctx], (void *)&version, sizeof(version));
SHA1Update(&sc->sc_sha1[ctx], (void *)&type, sizeof(type));
/* generate a key for the arpbalance hash, before the vhid is hashed */
bcopy(&sc->sc_sha1[ctx], &sha1ctx, 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 */
if (bcmp(sc->sc_ac.ac_enaddr, sc->sc_carplladdr, ETHER_ADDR_LEN) != 0)
SHA1Update(&sc->sc_sha1[ctx], sc->sc_ac.ac_enaddr,
ETHER_ADDR_LEN);
SHA1Update(&sc->sc_sha1[ctx], (void *)&vhid, sizeof(vhid));
/* Hash the addresses from smallest to largest, not interface order */
#ifdef INET
cur.s_addr = 0;
do {
found = 0;
last = cur;
cur.s_addr = 0xffffffff;
TAILQ_FOREACH(ifa, &sc->sc_if.if_addrlist, ifa_list) {
in.s_addr = ifatoia(ifa)->ia_addr.sin_addr.s_addr;
if (ifa->ifa_addr->sa_family == AF_INET &&
ntohl(in.s_addr) > ntohl(last.s_addr) &&
ntohl(in.s_addr) < ntohl(cur.s_addr)) {
cur.s_addr = in.s_addr;
found++;
}
}
if (found)
SHA1Update(&sc->sc_sha1[ctx],
(void *)&cur, sizeof(cur));
} while (found);
#endif /* INET */
#ifdef INET6
memset(&cur6, 0x00, sizeof(cur6));
do {
found = 0;
last6 = cur6;
memset(&cur6, 0xff, sizeof(cur6));
TAILQ_FOREACH(ifa, &sc->sc_if.if_addrlist, ifa_list) {
in6 = ifatoia6(ifa)->ia_addr.sin6_addr;
if (IN6_IS_SCOPE_EMBED(&in6)) {
if (ctx == HMAC_NOV6LL)
continue;
in6.s6_addr16[1] = 0;
}
if (ifa->ifa_addr->sa_family == AF_INET6 &&
memcmp(&in6, &last6, sizeof(in6)) > 0 &&
memcmp(&in6, &cur6, sizeof(in6)) < 0) {
cur6 = in6;
found++;
}
}
if (found)
SHA1Update(&sc->sc_sha1[ctx],
(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;
}
void
carp_hmac_generate(struct carp_softc *sc, u_int32_t counter[2],
unsigned char md[20], u_int8_t ctx)
{
SHA1_CTX sha1ctx;
/* fetch first half of inner hash */
bcopy(&sc->sc_sha1[ctx], &sha1ctx, 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);
}
int
carp_hmac_verify(struct carp_softc *sc, u_int32_t counter[2],
unsigned char md[20])
{
unsigned char md2[20];
u_int8_t i;
for (i=0; i < HMAC_MAX; i++) {
carp_hmac_generate(sc, counter, md2, i);
if (!bcmp(md, md2, sizeof(md2)))
return (0);
}
return (1);
}
void
carp_setroute(struct carp_softc *sc, int cmd)
{
struct ifaddr *ifa;
int s;
/* XXX this mess needs fixing */
s = splsoftnet();
TAILQ_FOREACH(ifa, &sc->sc_if.if_addrlist, ifa_list) {
switch (ifa->ifa_addr->sa_family) {
case AF_INET: {
int count = 0, error;
struct sockaddr sa;
struct rtentry *rt;
struct radix_node_head *rnh;
struct radix_node *rn;
struct rt_addrinfo info;
int hr_otherif, nr_ourif;
struct sockaddr_rtlabel sa_rl;
const char *label;
/*
* 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,
ifa, CARP_COUNT_MASTER);
if ((cmd == RTM_ADD && count != 1) ||
(cmd == RTM_DELETE && count != 0))
continue;
}
/* Remove the existing host route, if any */
bzero(&info, sizeof(info));
info.rti_info[RTAX_DST] = ifa->ifa_addr;
info.rti_flags = RTF_HOST;
error = rtrequest1(RTM_DELETE, &info, NULL, 0);
rt_missmsg(RTM_DELETE, &info, info.rti_flags, NULL,
error, 0);
/* Check for our address on another interface */
/* XXX cries for proper API */
rnh = rt_gettable(ifa->ifa_addr->sa_family, 0);
rn = rnh->rnh_matchaddr(ifa->ifa_addr, rnh);
rt = (struct rtentry *)rn;
hr_otherif = (rt && rt->rt_ifp != &sc->sc_if &&
rt->rt_flags & (RTF_CLONING|RTF_CLONED));
/* Check for a network route on our interface */
bcopy(ifa->ifa_addr, &sa, sizeof(sa));
satosin(&sa)->sin_addr.s_addr = satosin(ifa->ifa_netmask
)->sin_addr.s_addr & satosin(&sa)->sin_addr.s_addr;
rt = (struct rtentry *)rt_lookup(&sa,
ifa->ifa_netmask, 0);
nr_ourif = (rt && rt->rt_ifp == &sc->sc_if);
/* Restore the route label */
bzero(&sa_rl, sizeof(sa_rl));
if (rt && rt->rt_labelid) {
sa_rl.sr_len = sizeof(sa_rl);
sa_rl.sr_family = AF_UNSPEC;
label = rtlabel_id2name(rt->rt_labelid);
if (label != NULL)
strlcpy(sa_rl.sr_label, label,
sizeof(sa_rl.sr_label));
}
switch (cmd) {
case RTM_ADD:
if (hr_otherif) {
ifa->ifa_rtrequest = NULL;
ifa->ifa_flags &= ~RTF_CLONING;
bzero(&info, sizeof(info));
info.rti_info[RTAX_DST] = ifa->ifa_addr;
info.rti_info[RTAX_GATEWAY] = ifa->ifa_addr;
info.rti_flags = RTF_UP | RTF_HOST;
error = rtrequest1(RTM_ADD, &info, NULL, 0);
rt_missmsg(RTM_ADD, &info, info.rti_flags, NULL,
error, 0);
}
if (!hr_otherif || nr_ourif || !rt) {
if (nr_ourif && !(rt->rt_flags &
RTF_CLONING)) {
bzero(&info, sizeof(info));
info.rti_info[RTAX_DST] = &sa;
info.rti_info[RTAX_NETMASK] = ifa->ifa_netmask;
error = rtrequest1(RTM_DELETE, &info, NULL, 0);
rt_missmsg(RTM_DELETE, &info, info.rti_flags, NULL,
error, 0);
}
ifa->ifa_rtrequest = arp_rtrequest;
ifa->ifa_flags |= RTF_CLONING;
bzero(&info, sizeof(info));
info.rti_info[RTAX_DST] = &sa;
info.rti_info[RTAX_GATEWAY] = ifa->ifa_addr;
info.rti_info[RTAX_NETMASK] = ifa->ifa_netmask;
info.rti_info[RTAX_LABEL] =
(struct sockaddr *)&sa_rl;
error = rtrequest1(RTM_ADD, &info, NULL, 0);
if (error == 0)
ifa->ifa_flags |= IFA_ROUTE;
rt_missmsg(RTM_ADD, &info, info.rti_flags, NULL,
error, 0);
}
break;
case RTM_DELETE:
break;
default:
break;
}
break;
}
#ifdef INET6
case AF_INET6:
if (cmd == RTM_ADD)
in6_ifaddloop(ifa);
else
in6_ifremloop(ifa);
break;
#endif /* INET6 */
default:
break;
}
}
splx(s);
}
/*
* process input packet.
* we have rearranged checks order compared to the rfc,
* but it seems more efficient this way or not possible otherwise.
*/
void
carp_proto_input(struct mbuf *m, ...)
{
struct ip *ip = mtod(m, struct ip *);
struct carp_softc *sc = NULL;
struct carp_header *ch;
int iplen, len, hlen;
va_list ap;
va_start(ap, m);
hlen = va_arg(ap, int);
va_end(ap);
carpstats.carps_ipackets++;
if (!carp_opts[CARPCTL_ALLOW]) {
m_freem(m);
return;
}
/* check if received on a valid carp interface */
if (m->m_pkthdr.rcvif->if_type != IFT_CARP) {
carpstats.carps_badif++;
CARP_LOG(sc, ("packet received on non-carp interface: %s",
m->m_pkthdr.rcvif->if_xname));
m_freem(m);
return;
}
/* verify that the IP TTL is 255. */
if (ip->ip_ttl != CARP_DFLTTL) {
carpstats.carps_badttl++;
CARP_LOG(sc, ("received ttl %d != %d on %s", ip->ip_ttl,
CARP_DFLTTL, m->m_pkthdr.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) {
carpstats.carps_badlen++;
CARP_LOG(sc, ("packet too short %d on %s", m->m_pkthdr.len,
m->m_pkthdr.rcvif->if_xname));
m_freem(m);
return;
}
if ((m = m_pullup2(m, len)) == NULL) {
carpstats.carps_hdrops++;
return;
}
ip = mtod(m, struct ip *);
ch = (void *)ip + iplen;
/* verify the CARP checksum */
m->m_data += iplen;
if (carp_cksum(m, len - iplen)) {
carpstats.carps_badsum++;
CARP_LOG(sc, ("checksum failed on %s",
m->m_pkthdr.rcvif->if_xname));
m_freem(m);
return;
}
m->m_data -= iplen;
carp_proto_input_c(m, ch, AF_INET);
}
#ifdef INET6
int
carp6_proto_input(struct mbuf **mp, int *offp, int proto)
{
struct mbuf *m = *mp;
struct carp_softc *sc = NULL;
struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
struct carp_header *ch;
u_int len;
carpstats.carps_ipackets6++;
if (!carp_opts[CARPCTL_ALLOW]) {
m_freem(m);
return (IPPROTO_DONE);
}
/* check if received on a valid carp interface */
if (m->m_pkthdr.rcvif->if_type != IFT_CARP) {
carpstats.carps_badif++;
CARP_LOG(sc, ("packet received on non-carp interface: %s",
m->m_pkthdr.rcvif->if_xname));
m_freem(m);
return (IPPROTO_DONE);
}
/* verify that the IP TTL is 255 */
if (ip6->ip6_hlim != CARP_DFLTTL) {
carpstats.carps_badttl++;
CARP_LOG(sc, ("received ttl %d != %d on %s", ip6->ip6_hlim,
CARP_DFLTTL, m->m_pkthdr.rcvif->if_xname));
m_freem(m);
return (IPPROTO_DONE);
}
/* verify that we have a complete carp packet */
len = m->m_len;
IP6_EXTHDR_GET(ch, struct carp_header *, m, *offp, sizeof(*ch));
if (ch == NULL) {
carpstats.carps_badlen++;
CARP_LOG(sc, ("packet size %u too small", len));
return (IPPROTO_DONE);
}
/* verify the CARP checksum */
m->m_data += *offp;
if (carp_cksum(m, sizeof(*ch))) {
carpstats.carps_badsum++;
CARP_LOG(sc, ("checksum failed, on %s",
m->m_pkthdr.rcvif->if_xname));
m_freem(m);
return (IPPROTO_DONE);
}
m->m_data -= *offp;
carp_proto_input_c(m, ch, AF_INET6);
return (IPPROTO_DONE);
}
#endif /* INET6 */
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->m_pkthdr.rcvif->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)) {
carpstats.carps_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;
bzero(&sa, sizeof(sa));
sa.sa_family = af;
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) {
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_SCOPE_EMBED(&in6_src))
in6_src.s6_addr16[1] = 0;
if (IN6_IS_SCOPE_EMBED(&in6_found))
in6_found.s6_addr16[1] = 0;
if (IN6_ARE_ADDR_EQUAL(&in6_src, &in6_found)) {
m_freem(m);
return;
}
}
#endif /* INET6 */
}
getmicrotime(&sc->sc_if.if_lastchange);
sc->sc_if.if_ipackets++;
sc->sc_if.if_ibytes += m->m_pkthdr.len;
/* verify the CARP version. */
if (ch->carp_version != CARP_VERSION) {
carpstats.carps_badver++;
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)) {
carpstats.carps_badauth++;
sc->sc_if.if_ierrors++;
CARP_LOG(sc, ("incorrect hash"));
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_group_demote_count(sc) && 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 master who's going to
* be more frequent than us, go into BACKUP state.
*/
if (timercmp(&sc_tv, &ch_tv, >) ||
(timercmp(&sc_tv, &ch_tv, ==) &&
ch->carp_demote <=
(carp_group_demote_count(sc) & 0xff))) {
timeout_del(&sc->sc_ad_tmo);
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_master_down(sc);
break;
}
/*
* Take over masters advertising with a higher demote count,
* regardless of CARPCTL_PREEMPT.
*/
if (ch->carp_demote > (carp_group_demote_count(sc) & 0xff)) {
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_master_down(sc);
break;
}
/*
* Otherwise, we reset the counter and wait for the next
* advertisement.
*/
carp_setrun(sc, af);
break;
}
m_freem(m);
return;
}
int
carp_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp, void *newp,
size_t newlen)
{
/* All sysctl names at this level are terminal. */
if (namelen != 1)
return (ENOTDIR);
if (name[0] <= 0 || name[0] >= CARPCTL_MAXID)
return (ENOPROTOOPT);
return sysctl_int(oldp, oldlenp, newp, newlen, &carp_opts[name[0]]);
}
/*
* Interface side of the CARP implementation.
*/
/* ARGSUSED */
void
carpattach(int n)
{
struct ifg_group *ifg;
if ((ifg = if_creategroup("carp")) != NULL)
ifg->ifg_refcnt++; /* keep around even if empty */
if_clone_attach(&carp_cloner);
}
int
carp_clone_create(ifc, unit)
struct if_clone *ifc;
int unit;
{
struct carp_softc *sc;
struct ifnet *ifp;
sc = malloc(sizeof(*sc), M_DEVBUF, M_NOWAIT);
if (!sc)
return (ENOMEM);
bzero(sc, sizeof(*sc));
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 */
timeout_set(&sc->sc_ad_tmo, carp_send_ad, sc);
timeout_set(&sc->sc_md_tmo, carp_master_down, sc);
timeout_set(&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;
ifp->if_output = carp_output;
ifp->if_type = IFT_CARP;
ifp->if_addrlen = ETHER_ADDR_LEN;
ifp->if_hdrlen = ETHER_HDR_LEN;
ifp->if_mtu = ETHERMTU;
IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
IFQ_SET_READY(&ifp->if_snd);
if_attach(ifp);
if_alloc_sadl(ifp);
LIST_INIT(&sc->sc_ac.ac_multiaddrs);
#if NBPFILTER > 0
bpfattach(&ifp->if_bpf, ifp, DLT_EN10MB, ETHER_HDR_LEN);
#endif
return (0);
}
int
carp_clone_destroy(struct ifnet *ifp)
{
carpdetach(ifp->if_softc);
ether_ifdetach(ifp);
if_detach(ifp);
free(ifp->if_softc, M_DEVBUF);
return (0);
}
void
carpdetach(struct carp_softc *sc)
{
struct carp_if *cif;
int s;
timeout_del(&sc->sc_ad_tmo);
timeout_del(&sc->sc_md_tmo);
timeout_del(&sc->sc_md6_tmo);
if (sc->sc_suppress)
carp_group_demote_adj(&sc->sc_if, -1);
sc->sc_suppress = 0;
if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS)
carp_group_demote_adj(&sc->sc_if, -1);
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);
s = splnet();
if (sc->sc_carpdev != NULL) {
if (sc->lh_cookie != NULL)
hook_disestablish(sc->sc_carpdev->if_linkstatehooks,
sc->lh_cookie);
cif = (struct carp_if *)sc->sc_carpdev->if_carp;
TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list);
if (!--cif->vhif_nvrs) {
ifpromisc(sc->sc_carpdev, 0);
sc->sc_carpdev->if_carp = NULL;
FREE(cif, M_IFADDR);
}
}
sc->sc_carpdev = NULL;
splx(s);
}
/* 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);
}
}
int
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 = arc4random();
sc->sc_counter = sc->sc_counter << 32;
sc->sc_counter += arc4random();
} else
sc->sc_counter++;
ch->carp_counter[0] = htonl((sc->sc_counter>>32)&0xffffffff);
ch->carp_counter[1] = htonl(sc->sc_counter&0xffffffff);
/*
* For the time being, do not include the IPv6 linklayer addresses
* in the HMAC.
*/
carp_hmac_generate(sc, ch->carp_counter, ch->carp_md, HMAC_NOV6LL);
return (0);
}
void
carp_send_ad_all(void)
{
struct ifnet *ifp;
struct carp_if *cif;
struct carp_softc *vh;
TAILQ_FOREACH(ifp, &ifnet, if_list) {
if (ifp->if_carp == NULL || ifp->if_type == IFT_CARP)
continue;
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);
}
}
}
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 ifaddr *ifa;
struct sockaddr sa;
s = splsoftnet();
if (sc->sc_carpdev == NULL) {
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_group_demote_count(sc) || 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_demote = carp_group_demote_count(sc) & 0xff;
ch.carp_advbase = advbase;
ch.carp_advskew = advskew;
ch.carp_authlen = 7; /* XXX DEFINE */
ch.carp_cksum = 0;
#ifdef INET
if (sc->sc_naddrs) {
struct ip *ip;
MGETHDR(m, M_DONTWAIT, MT_HEADER);
if (m == NULL) {
sc->sc_if.if_oerrors++;
carpstats.carps_onomem++;
/* XXX maybe less ? */
goto retry_later;
}
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->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 = htons(ip_randomid());
ip->ip_off = htons(IP_DF);
ip->ip_ttl = CARP_DFLTTL;
ip->ip_p = IPPROTO_CARP;
ip->ip_sum = 0;
bzero(&sa, sizeof(sa));
sa.sa_family = AF_INET;
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;
ip->ip_dst.s_addr = INADDR_CARP_GROUP;
ch_ptr = (void *)ip + sizeof(*ip);
bcopy(&ch, ch_ptr, sizeof(ch));
if (carp_prepare_ad(m, sc, ch_ptr))
goto retry_later;
m->m_data += sizeof(*ip);
ch_ptr->carp_cksum = carp_cksum(m, len - sizeof(*ip));
m->m_data -= sizeof(*ip);
getmicrotime(&sc->sc_if.if_lastchange);
sc->sc_if.if_opackets++;
sc->sc_if.if_obytes += len;
carpstats.carps_opackets++;
error = ip_output(m, NULL, NULL, IP_RAWOUTPUT, &sc->sc_imo,
NULL);
if (error) {
if (error == ENOBUFS)
carpstats.carps_onomem++;
else
CARP_LOG(sc, ("ip_output failed: %d", error));
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_group_demote_adj(&sc->sc_if, 1);
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_group_demote_adj(&sc->sc_if, -1);
sc->sc_sendad_errors = 0;
}
} else
sc->sc_sendad_errors = 0;
}
if (sc->sc_delayed_arp > 0)
sc->sc_delayed_arp--;
if (sc->sc_delayed_arp == 0) {
carp_send_arp(sc);
sc->sc_delayed_arp = -1;
}
}
#endif /* INET */
#ifdef INET6
if (sc->sc_naddrs6) {
struct ip6_hdr *ip6;
MGETHDR(m, M_DONTWAIT, MT_HEADER);
if (m == NULL) {
sc->sc_if.if_oerrors++;
carpstats.carps_onomem++;
/* XXX maybe less ? */
goto retry_later;
}
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->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;
/* set the source address */
bzero(&sa, sizeof(sa));
sa.sa_family = AF_INET6;
ifa = ifaof_ifpforaddr(&sa, sc->sc_carpdev);
if (ifa == NULL) /* This should never happen with IPv6 */
bzero(&ip6->ip6_src, sizeof(struct in6_addr));
else
bcopy(ifatoia6(ifa)->ia_addr.sin6_addr.s6_addr,
&ip6->ip6_src, sizeof(struct in6_addr));
/* set the multicast destination */
ip6->ip6_dst.s6_addr8[0] = 0xff;
ip6->ip6_dst.s6_addr8[1] = 0x02;
ip6->ip6_dst.s6_addr8[15] = 0x12;
ch_ptr = (void *)ip6 + sizeof(*ip6);
bcopy(&ch, ch_ptr, sizeof(ch));
if (carp_prepare_ad(m, sc, ch_ptr))
goto retry_later;
m->m_data += sizeof(*ip6);
ch_ptr->carp_cksum = carp_cksum(m, len - sizeof(*ip6));
m->m_data -= sizeof(*ip6);
getmicrotime(&sc->sc_if.if_lastchange);
sc->sc_if.if_opackets++;
sc->sc_if.if_obytes += len;
carpstats.carps_opackets6++;
error = ip6_output(m, NULL, NULL, 0, &sc->sc_im6o, NULL, NULL);
if (error) {
if (error == ENOBUFS)
carpstats.carps_onomem++;
else
CARP_LOG(sc, ("ip6_output failed: %d", error));
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_group_demote_adj(&sc->sc_if, 1);
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_group_demote_adj(&sc->sc_if, -1);
sc->sc_sendad_errors = 0;
}
} else
sc->sc_sendad_errors = 0;
}
}
#endif /* INET6 */
retry_later:
splx(s);
if (advbase != 255 || advskew != 255)
timeout_add(&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.
*/
void
carp_send_arp(struct carp_softc *sc)
{
struct ifaddr *ifa;
in_addr_t in;
int s = splsoftnet();
TAILQ_FOREACH(ifa, &sc->sc_if.if_addrlist, ifa_list) {
if (ifa->ifa_addr->sa_family != AF_INET)
continue;
if (carp_addrcount((struct carp_if *)sc->sc_carpdev->if_carp,
ifa, CARP_COUNT_LINK0))
continue;
in = ifatoia(ifa)->ia_addr.sin_addr.s_addr;
arprequest(sc->sc_carpdev, &in, &in, sc->sc_ac.ac_enaddr);
DELAY(1000); /* XXX */
}
splx(s);
}
#ifdef INET6
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 = splsoftnet();
TAILQ_FOREACH(ifa, &sc->sc_if.if_addrlist, ifa_list) {
if (ifa->ifa_addr->sa_family != AF_INET6)
continue;
in6 = &ifatoia6(ifa)->ia_addr.sin6_addr;
nd6_na_output(sc->sc_carpdev, &mcast, in6,
ND_NA_FLAG_OVERRIDE, 1, NULL);
DELAY(1000); /* XXX */
}
splx(s);
}
#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)
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);
}
int
carp_addrcount(struct carp_if *cif, struct ifaddr *ifa0, int type)
{
struct carp_softc *vh;
struct ifaddr *ifa;
int count = 0;
TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
switch (type) {
case CARP_COUNT_RUNNING:
if ((vh->sc_if.if_flags & (IFF_UP|IFF_RUNNING)) !=
(IFF_UP|IFF_RUNNING))
continue;
break;
case CARP_COUNT_MASTER:
if (vh->sc_state != MASTER)
continue;
break;
case CARP_COUNT_LINK0:
if (!(vh->sc_if.if_flags & IFF_LINK0) ||
(vh->sc_if.if_flags & (IFF_UP|IFF_RUNNING)) !=
(IFF_UP|IFF_RUNNING))
continue;
break;
}
TAILQ_FOREACH(ifa, &vh->sc_if.if_addrlist, ifa_list) {
if (ifa->ifa_addr->sa_family == AF_INET &&
ifa0->ifa_addr->sa_family == AF_INET &&
ifatoia(ifa0)->ia_addr.sin_addr.s_addr ==
ifatoia(ifa)->ia_addr.sin_addr.s_addr)
count++;
#ifdef INET6
if (ifa->ifa_addr->sa_family == AF_INET6 &&
ifa0->ifa_addr->sa_family == AF_INET6 &&
IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa0), IFA_IN6(ifa)))
count++;
#endif
}
}
return (count);
}
void
carp_update_lsmask(struct carp_softc *sc)
{
struct carp_softc *curvh, *vh, *sc0 = NULL;
struct carp_if *cif;
struct ifaddr *ifa, *ifa0 = NULL;
int cur, last, count, found;
if (!sc->sc_carpdev)
return;
cif = (struct carp_if *)sc->sc_carpdev->if_carp;
/*
* Take the first IPv4 address from the LINK0 carp interface
* to determine the load sharing group.
* Fallback on the first IPv6 address.
*/
TAILQ_FOREACH(sc0, &cif->vhif_vrs, sc_list)
if (sc0->sc_if.if_flags & IFF_LINK0)
break;
if (sc0 == NULL)
return;
TAILQ_FOREACH(ifa0, &sc0->sc_if.if_addrlist, ifa_list)
if (ifa0->ifa_addr->sa_family == AF_INET)
break;
#ifdef INET6
if (ifa0 == NULL)
TAILQ_FOREACH(ifa0, &sc0->sc_if.if_addrlist, ifa_list)
if (ifa0->ifa_addr->sa_family == AF_INET6 &&
!IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa0)))
break;
#endif
if (ifa0 == NULL)
return;
/*
* Calculate the load sharing mask w/ all carp interfaces
* that share the first address of the LINK0 interface.
* Sort by virtual host ID.
*/
sc0->sc_lsmask = 0;
cur = 0;
curvh = NULL;
count = 0;
do {
found = 0;
last = cur;
cur = 255;
TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
if ((vh->sc_if.if_flags & (IFF_UP|IFF_RUNNING)) !=
(IFF_UP|IFF_RUNNING))
continue;
TAILQ_FOREACH(ifa, &vh->sc_if.if_addrlist, ifa_list) {
if (ifa->ifa_addr->sa_family == AF_INET &&
ifa0->ifa_addr->sa_family == AF_INET &&
ifatoia(ifa0)->ia_addr.sin_addr.s_addr ==
ifatoia(ifa)->ia_addr.sin_addr.s_addr)
break;
#ifdef INET6
if (ifa->ifa_addr->sa_family == AF_INET6 &&
ifa0->ifa_addr->sa_family == AF_INET6 &&
IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa0), IFA_IN6(ifa)))
break;
#endif
}
if (ifa && vh->sc_vhid > last && vh->sc_vhid < cur) {
cur = vh->sc_vhid;
curvh = vh;
found++;
}
}
if (found) {
if (curvh->sc_state == MASTER &&
count < sizeof(sc0->sc_lsmask) * 8)
sc0->sc_lsmask |= 1 << count;
count++;
}
} while (found);
sc0->sc_lscount = count;
if (count == 0)
return;
CARP_LOG(sc, ("carp_update_lsmask: %x", sc0->sc_lsmask))
}
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 the asked address is found on a LINK0 interface
* don't answer the arp reply unless we are MASTER on it.
*/
if (!(sc->sc_if.if_flags & IFF_LINK0) && sc->sc_carpdev &&
carp_addrcount((struct carp_if *)sc->sc_carpdev->if_carp,
(struct ifaddr *)ia, CARP_COUNT_LINK0))
return (0);
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 eligible carp interfaces with this address */
if (*count == 0)
*count = carp_addrcount(
(struct carp_if *)ia->ia_ifp->if_carpdev->if_carp,
(struct ifaddr *)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
int
carp_iamatch6(struct ifnet *ifp, struct ifaddr *ifa)
{
struct carp_softc *sc = ifp->if_softc;
/*
* If the asked address is found on a LINK0 interface
* don't answer the arp request unless we are MASTER on it.
*/
if (!(sc->sc_if.if_flags & IFF_LINK0) && sc->sc_carpdev &&
carp_addrcount((struct carp_if *)sc->sc_carpdev->if_carp,
ifa, CARP_COUNT_LINK0))
return (0);
if (sc->sc_state == MASTER)
return (1);
return (0);
}
#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;
TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
if ((vh->sc_if.if_flags & (IFF_UP|IFF_RUNNING)) !=
(IFF_UP|IFF_RUNNING))
continue;
if ((vh->sc_state == MASTER || vh->sc_if.if_flags & IFF_LINK0)
&& !bcmp(ena, vh->sc_ac.ac_enaddr, 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->m_pkthdr.rcvif->if_carp;
struct ifnet *ifp;
bcopy(shost, &eh.ether_shost, sizeof(eh.ether_shost));
bcopy(dhost, &eh.ether_dhost, sizeof(eh.ether_dhost));
eh.ether_type = etype;
if ((ifp = carp_ourether(cif, &eh, m->m_pkthdr.rcvif->if_type, 0)))
;
else 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_copym2(m, 0, M_COPYALL, M_DONTWAIT);
if (m0 == NULL)
continue;
m0->m_pkthdr.rcvif = &vh->sc_if;
ether_input(&vh->sc_if, &eh, m0);
}
return (1);
}
if (ifp == NULL)
return (1);
m->m_pkthdr.rcvif = ifp;
#if NBPFILTER > 0
if (ifp->if_bpf)
bpf_mtap_hdr(ifp->if_bpf, (char *)&eh, ETHER_HDR_LEN, m,
BPF_DIRECTION_IN);
#endif
ifp->if_ipackets++;
ether_input(ifp, &eh, m);
return (0);
}
int
carp_lsdrop(struct mbuf *m, sa_family_t af, u_int32_t *src, u_int32_t *dst)
{
struct carp_softc *sc = m->m_pkthdr.rcvif->if_softc;
int match;
u_int32_t fold;
/*
* Never drop carp advertisements.
* XXX Bad idea to pass all broadcast / multicast traffic?
*/
if (m->m_flags & (M_BCAST|M_MCAST))
return (0);
fold = src[0] ^ dst[0];
#ifdef INET6
if (af == AF_INET6) {
int i;
for (i = 1; i < 4; i++)
fold ^= src[i] ^ dst[i];
}
#endif
if (sc->sc_lscount == 0) /* just to be safe */
return (1);
match = (1 << (ntohl(fold) % sc->sc_lscount)) & sc->sc_lsmask;
return (!match);
}
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_set_state(sc, MASTER);
carp_send_ad(sc);
carp_send_arp(sc);
/* Schedule a delayed ARP request to deal w/ some L3 switches */
sc->sc_delayed_arp = 2;
#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.
*/
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:
timeout_del(&sc->sc_ad_tmo);
tv.tv_sec = 3 * sc->sc_advbase;
tv.tv_usec = sc->sc_advskew * 1000000 / 256;
sc->sc_delayed_arp = -1;
switch (af) {
#ifdef INET
case AF_INET:
timeout_add(&sc->sc_md_tmo, tvtohz(&tv));
break;
#endif /* INET */
#ifdef INET6
case AF_INET6:
timeout_add(&sc->sc_md6_tmo, tvtohz(&tv));
break;
#endif /* INET6 */
default:
if (sc->sc_naddrs)
timeout_add(&sc->sc_md_tmo, tvtohz(&tv));
if (sc->sc_naddrs6)
timeout_add(&sc->sc_md6_tmo, tvtohz(&tv));
break;
}
break;
case MASTER:
tv.tv_sec = sc->sc_advbase;
tv.tv_usec = sc->sc_advskew * 1000000 / 256;
timeout_add(&sc->sc_ad_tmo, tvtohz(&tv));
break;
}
}
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_ifp = NULL;
#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_ifp = NULL;
#endif
/* And any other multicast memberships */
carp_ether_purgemulti(sc);
}
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) {
MALLOC(ncif, struct carp_if *, sizeof(*cif),
M_IFADDR, M_NOWAIT);
if (ncif == NULL)
return (ENOBUFS);
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 = (caddr_t)ncif;
sc->sc_carpdev = ifp;
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);
s = splnet();
sc->lh_cookie = hook_establish(ifp->if_linkstatehooks, 1,
carp_carpdev_state, ifp);
carp_carpdev_state(ifp);
splx(s);
} else {
carpdetach(sc);
sc->sc_if.if_flags &= ~(IFF_UP|IFF_RUNNING);
}
return (0);
}
void
carp_set_enaddr(struct carp_softc *sc)
{
if (sc->sc_vhid != -1 && sc->sc_carpdev) {
/* XXX detach ipv6 link-local address? */
if (sc->sc_if.if_flags & IFF_LINK2)
sc->sc_carplladdr[0] = 1;
else
sc->sc_carplladdr[0] = 0;
sc->sc_carplladdr[1] = 0;
sc->sc_carplladdr[2] = 0x5e;
sc->sc_carplladdr[3] = 0;
sc->sc_carplladdr[4] = 1;
sc->sc_carplladdr[5] = sc->sc_vhid;
} else
bzero(sc->sc_carplladdr, ETHER_ADDR_LEN);
/*
* Use the carp lladdr if the running one isn't manually set.
* Only compare static parts of the lladdr.
*/
if ((bcmp(sc->sc_ac.ac_enaddr + 1, sc->sc_carplladdr + 1,
ETHER_ADDR_LEN - 2) == 0) ||
(!sc->sc_ac.ac_enaddr[0] && !sc->sc_ac.ac_enaddr[1] &&
!sc->sc_ac.ac_enaddr[2] && !sc->sc_ac.ac_enaddr[3] &&
!sc->sc_ac.ac_enaddr[4] && !sc->sc_ac.ac_enaddr[5]))
bcopy(sc->sc_carplladdr, sc->sc_ac.ac_enaddr, ETHER_ADDR_LEN);
/* Make sure the enaddr has changed before further twiddling. */
if (bcmp(sc->sc_ac.ac_enaddr, sc->sc_curlladdr, ETHER_ADDR_LEN) != 0) {
bcopy(sc->sc_ac.ac_enaddr, LLADDR(sc->sc_if.if_sadl),
ETHER_ADDR_LEN);
bcopy(sc->sc_ac.ac_enaddr, sc->sc_curlladdr, ETHER_ADDR_LEN);
#ifdef INET6
/*
* (re)attach a link-local address which matches
* our new MAC address.
*/
in6_ifattach_linklocal(&sc->sc_if, NULL);
#endif
carp_set_state(sc, INIT);
carp_setrun(sc, 0);
}
}
void
carp_addr_updated(void *v)
{
struct carp_softc *sc = (struct carp_softc *) v;
struct ifaddr *ifa;
int new_naddrs = 0, new_naddrs6 = 0;
TAILQ_FOREACH(ifa, &sc->sc_if.if_addrlist, ifa_list) {
if (ifa->ifa_addr->sa_family == AF_INET)
new_naddrs++;
else if (ifa->ifa_addr->sa_family == AF_INET6 &&
!IN6_IS_ADDR_LINKLOCAL(&ifatoia6(ifa)->ia_addr.sin6_addr))
new_naddrs6++;
}
/* Handle a callback after SIOCDIFADDR */
if (new_naddrs < sc->sc_naddrs || new_naddrs6 < sc->sc_naddrs6) {
struct in_addr mc_addr;
struct in_multi *inm;
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;
IN_LOOKUP_MULTI(mc_addr, &sc->sc_if, inm);
if (inm == NULL) {
bzero(&sc->sc_imo, 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);
}
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;
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;
for (ia = TAILQ_FIRST(&in_ifaddr); ia;
ia = TAILQ_NEXT(ia, ia_list)) {
/* 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 {
ifp = ia->ia_ifp;
}
}
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);
/*
* 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 == NULL)
sc->ah_cookie = hook_establish(sc->sc_if.if_addrhooks, 0,
carp_addr_updated, sc);
return (0);
}
int
carp_join_multicast(struct carp_softc *sc)
{
struct ip_moptions *imo = &sc->sc_imo, tmpimo;
struct in_addr addr;
bzero(&tmpimo, 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_ifp = &sc->sc_if;
imo->imo_multicast_ttl = CARP_DFLTTL;
imo->imo_multicast_loop = 0;
return (0);
}
#ifdef INET6
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;
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;
for (ia = in6_ifaddr; ia; ia = ia->ia_next) {
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;
}
}
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);
if (!IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))
sc->sc_naddrs6++;
if (sc->sc_carpdev != NULL && sc->sc_naddrs6)
sc->sc_if.if_flags |= IFF_UP;
carp_set_state(sc, INIT);
carp_setrun(sc, 0);
return (0);
}
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 */
bzero(&addr6, 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)) == NULL) {
return (error);
}
/* join solicited multicast address */
bzero(&addr6.sin6_addr, 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)) == NULL) {
in6_leavegroup(imm);
return (error);
}
/* apply v6 multicast membership */
im6o->im6o_multicast_ifp = &sc->sc_if;
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 */
int
carp_ioctl(struct ifnet *ifp, u_long cmd, caddr_t addr)
{
struct proc *p = curproc; /* XXX */
struct carp_softc *sc = ifp->if_softc, *vr;
struct carpreq carpr;
struct ifaddr *ifa = (struct ifaddr *)addr;
struct ifreq *ifr = (struct ifreq *)addr;
struct ifnet *cdev = NULL;
int error = 0;
switch (cmd) {
case SIOCSIFADDR:
switch (ifa->ifa_addr->sa_family) {
#ifdef INET
case AF_INET:
sc->sc_if.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:
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 (sc->sc_state != INIT && !(ifr->ifr_flags & IFF_UP)) {
timeout_del(&sc->sc_ad_tmo);
timeout_del(&sc->sc_md_tmo);
timeout_del(&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_set_enaddr(sc); /* for changes on LINK2 */
if (ifr->ifr_flags & IFF_LINK0)
carp_update_lsmask(sc);
break;
case SIOCSVH:
if ((error = suser(p, p->p_acflag)) != 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:
timeout_del(&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 && carpr.carpr_vhid != sc->sc_vhid) {
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);
}
if (carpr.carpr_vhid != sc->sc_vhid) {
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 >= 255) {
error = EINVAL;
break;
}
if (carpr.carpr_advbase > 255) {
error = EINVAL;
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:
bzero(&carpr, 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 (suser(p, p->p_acflag) == 0)
bcopy(sc->sc_key, carpr.carpr_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 SIOCAIFGROUP:
case SIOCDIFGROUP:
if (sc->sc_suppress)
carp_ifgroup_ioctl(ifp, cmd, addr);
break;
case SIOCSIFGATTR:
carp_ifgattr_ioctl(ifp, cmd, addr);
break;
default:
error = EINVAL;
}
if (bcmp(sc->sc_ac.ac_enaddr, sc->sc_curlladdr, ETHER_ADDR_LEN) != 0)
carp_set_enaddr(sc);
carp_hmac_prepare(sc);
return (error);
}
void
carp_ifgroup_ioctl(struct ifnet *ifp, u_long cmd, caddr_t addr)
{
struct ifgroupreq *ifgr = (struct ifgroupreq *)addr;
struct ifg_list *ifgl;
if (!strcmp(ifgr->ifgr_group, IFG_ALL))
return;
TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next)
if (!strcmp(ifgl->ifgl_group->ifg_group, ifgr->ifgr_group)) {
if (cmd == SIOCAIFGROUP)
ifgl->ifgl_group->ifg_carp_demoted++;
else if (cmd == SIOCDIFGROUP &&
ifgl->ifgl_group->ifg_carp_demoted)
ifgl->ifgl_group->ifg_carp_demoted--;
}
}
void
carp_ifgattr_ioctl(struct ifnet *ifp, u_long cmd, caddr_t addr)
{
struct ifgroupreq *ifgr = (struct ifgroupreq *)addr;
struct carp_softc *sc = ifp->if_softc;
if (ifgr->ifgr_attrib.ifg_carp_demoted > 0 && (sc->sc_if.if_flags &
(IFF_UP|IFF_RUNNING)) == (IFF_UP|IFF_RUNNING) &&
sc->sc_state == MASTER)
carp_send_ad(sc);
}
/*
* Start output on carp interface. This function should never be called.
*/
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, struct sockaddr *sa,
struct rtentry *rt)
{
struct carp_softc *sc = ((struct carp_softc *)ifp->if_softc);
if (sc->sc_carpdev != NULL && sc->sc_state == MASTER)
return (sc->sc_carpdev->if_output(ifp, m, sa, rt));
else {
m_freem(m);
return (ENETUNREACH);
}
}
void
carp_set_state(struct carp_softc *sc, int state)
{
if (sc->sc_state == state)
return;
sc->sc_state = state;
carp_update_lsmask(sc);
switch (state) {
case BACKUP:
sc->sc_if.if_link_state = LINK_STATE_DOWN;
break;
case MASTER:
sc->sc_if.if_link_state = LINK_STATE_UP;
break;
default:
sc->sc_if.if_link_state = LINK_STATE_UNKNOWN;
break;
}
if_link_state_change(&sc->sc_if);
}
void
carp_group_demote_adj(struct ifnet *ifp, int adj)
{
struct ifg_list *ifgl;
int *dm;
struct carp_softc *nil = NULL;
TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) {
if (!strcmp(ifgl->ifgl_group->ifg_group, IFG_ALL))
continue;
dm = &ifgl->ifgl_group->ifg_carp_demoted;
if (*dm + adj >= 0)
*dm += adj;
else
*dm = 0;
if (adj > 0 && *dm == 1)
carp_send_ad_all();
CARP_LOG(nil, ("%s demoted group %s to %d", ifp->if_xname,
ifgl->ifgl_group->ifg_group, *dm));
}
}
int
carp_group_demote_count(struct carp_softc *sc)
{
struct ifg_list *ifgl;
int count = 0;
TAILQ_FOREACH(ifgl, &sc->sc_if.if_groups, ifgl_next)
count += ifgl->ifgl_group->ifg_carp_demoted;
return (count);
}
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;
timeout_del(&sc->sc_ad_tmo);
timeout_del(&sc->sc_md_tmo);
timeout_del(&sc->sc_md6_tmo);
carp_set_state(sc, INIT);
sc->sc_suppress = 1;
carp_setrun(sc, 0);
if (!suppressed)
carp_group_demote_adj(&sc->sc_if, 1);
} else {
carp_set_state(sc, INIT);
sc->sc_suppress = 0;
carp_setrun(sc, 0);
if (suppressed)
carp_group_demote_adj(&sc->sc_if, -1);
}
}
}
int
carp_ether_addmulti(struct carp_softc *sc, struct ifreq *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(ifr, (struct arpcom *)&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.
*/
MALLOC(mc, struct carp_mc_entry *, 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(&ifr->ifr_addr, addrlo, addrhi);
ETHER_LOOKUP_MULTI(addrlo, addrhi, &sc->sc_ac, mc->mc_enm);
memcpy(&mc->mc_addr, &ifr->ifr_addr, ifr->ifr_addr.sa_len);
LIST_INSERT_HEAD(&sc->carp_mc_listhead, mc, mc_entries);
error = (*ifp->if_ioctl)(ifp, SIOCADDMULTI, (caddr_t)ifr);
if (error != 0)
goto ioctl_failed;
return (error);
ioctl_failed:
LIST_REMOVE(mc, mc_entries);
FREE(mc, M_DEVBUF);
alloc_failed:
(void)ether_delmulti(ifr, (struct arpcom *)&sc->sc_ac);
return (error);
}
int
carp_ether_delmulti(struct carp_softc *sc, struct ifreq *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(&ifr->ifr_addr, addrlo, addrhi)) != 0)
return (error);
ETHER_LOOKUP_MULTI(addrlo, addrhi, &sc->sc_ac, enm);
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(ifr, (struct arpcom *)&sc->sc_ac);
if (error != ENETRESET)
return (error);
/* We no longer use this multicast address. Tell parent so. */
error = (*ifp->if_ioctl)(ifp, SIOCDELMULTI, (caddr_t)ifr);
if (error == 0) {
/* And forget about this address. */
LIST_REMOVE(mc, mc_entries);
FREE(mc, M_DEVBUF);
} else
(void)ether_addmulti(ifr, (struct arpcom *)&sc->sc_ac);
return (error);
}
/*
* Delete any multicast address we have asked to add from parent
* interface. Called when the carp is being unconfigured.
*/
void
carp_ether_purgemulti(struct carp_softc *sc)
{
struct ifnet *ifp = sc->sc_carpdev; /* Parent. */
struct carp_mc_entry *mc;
union {
struct ifreq ifreq;
struct {
char ifr_name[IFNAMSIZ];
struct sockaddr_storage ifr_ss;
} ifreq_storage;
} u;
struct ifreq *ifr = &u.ifreq;
if (ifp == NULL)
return;
memcpy(ifr->ifr_name, ifp->if_xname, IFNAMSIZ);
while ((mc = LIST_FIRST(&sc->carp_mc_listhead)) != NULL) {
memcpy(&ifr->ifr_addr, &mc->mc_addr, mc->mc_addr.ss_len);
(void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, (caddr_t)ifr);
LIST_REMOVE(mc, mc_entries);
FREE(mc, M_DEVBUF);
}
}