Subject: Send gratuitous ARP... from CARP... using arprequest...
To: None <current-users@NetBSD.org>
From: Michael Hertrick <m.hertrick@neovera.com>
List: current-users
Date: 11/07/2003 13:42:50
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I'm working on runnng CARP with NetBSD-current and I'm hung up on the
section which sends the gratuitous arp.
When I compile the kernel, I get the following error on ip_carp.c:
cc -ffreestanding -O2 -Werror -Wall -Wno-main -Wno-format-zero-length
-Wpointer-arith -Wmissing-prototypes -Wstrict-prototypes
-Wno-sign-compare -Wno-uninitialized -Di386 -I. -I../../../../arch
-I../../../.. -nostdinc -DLKM -DMAXUSERS=32 -D_KERNEL -D_KERNEL_OPT -c
../../../../netinet/ip_carp.c
../../../../netinet/ip_carp.c: In function `carp_send_arp':
../../../../netinet/ip_carp.c:643: warning: implicit declaration of
function `arprequest'
*** Error code 1
Stop.
Refer to attached file, ip_carp.c.
The only place I can find arprequest in -current source is in
netinet/if_ether.c. I put "void arprequest ((struct ifnet *, u_int32_t
*, u_int32_t *, u_int8_t *));" in ip_carp.c, and then ip_carp.c compiles
fine, but towards the end of the kernel compile it reports "undefined
reference to arprequest" from ip_carp.o. Am I missing something simple
or am I not even in the ballpark? (I'll put money on the latter)
So, where/how does arprequest need to be defined in order for ip_carp
[and other programs, for that matter] to call it at will?
If there is a more appropriate mailing list for this kind of thing,
please let me know. I figured this one would be appropriate since I'm
using -current to do the work.
Thanks,
Michael.
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filename="ip_carp.c"
/*
* 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.
*/
#include <sys/param.h>
#include <sys/proc.h>
#include <sys/systm.h>
#include <sys/mbuf.h>
#include <sys/socket.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 <sys/callout.h>
#include <machine/cpu.h>
#include <machine/stdarg.h>
#include <net/if.h>
#include <net/if_types.h>
#include <net/if_ether.h>
#include <net/if_llc.h>
#include <net/if_arc.h>
#include <net/if_arp.h>
#include <net/route.h>
#include <net/netisr.h>
#if NFDDI > 0
#include <net/if_fddi.h>
#endif
#if NTOKEN > 0
#include <net/if_token.h>
#endif
#include <sys/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 <netipsec/ipsec.h>
#endif
#include "bpfilter.h"
#if NBPFILTER > 0
#include <net/bpf.h>
#endif
#include <netinet/ip_carp.h>
int hzto(struct timeval *);
struct arpstat arpstat;
struct carp_softc {
struct ethercom sc_ac;
int if_flags; /* current flags to treat UP/DOWN */
struct ifnet *sc_ifp;
struct in_ifaddr *sc_ia; /* primary iface address */
struct ip_moptions sc_imo;
TAILQ_ENTRY(carp_softc) sc_list;
enum { INIT = 0, BACKUP, MASTER } sc_state;
int sc_vhid;
int sc_advskew;
int sc_naddrs;
int sc_advbase; /* seconds */
int sc_init_counter;
unsigned char sc_key[CARP_KEY_LEN];
u_int64_t sc_counter;
struct callout sc_ad_tmo; /* advertisement timeout */
struct callout sc_md_tmo; /* master down timeout */
} *carp_softc;
int carp_number;
int carp_opts[CARPCTL_MAXID] = { 0, 1, 0, 1, 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(s,a) if (carp_opts[CARPCTL_LOG]) \
log(LOG_INFO, "carp: " s "\n", (a));
#define CARP_LOG1(sc,s,a) if (carp_opts[CARPCTL_LOG]) \
log(LOG_INFO, "%s: " s "\n", (sc)->sc_ac.ec_if.if_xname, (a));
void carp_hmac_generate (struct carp_softc *, u_int32_t *,
unsigned char *);
int carp_hmac_verify (struct carp_softc *, u_int32_t *,
unsigned char *);
void carpattach (int);
void carpdetach (struct carp_softc *);
void carp_send_ad (void *);
void carp_send_arp (struct carp_softc *);
void carp_master_down (void *);
int carp_sluggish (struct carp_softc *, struct carp_header *);
int carp_ioctl (struct ifnet *, u_long, caddr_t);
void carp_start (struct ifnet *);
void carp_setrun (struct carp_softc *);
int carp_set_addr (struct carp_softc *, struct sockaddr_in *);
int carp_del_addr (struct carp_softc *, struct sockaddr_in *);
static __inline u_int16_t
carp_cksum(struct mbuf *m, int len)
{
return in_cksum(m, len);
}
#define CARP_HMAC_PAD 64
void
carp_hmac_generate(struct carp_softc *sc, u_int32_t counter[2],
unsigned char md[20])
{
SHA1_CTX sha1ctx;
u_int8_t version = CARP_VERSION, type = CARP_ADVERTISEMENT;
u_int8_t vhid = sc->sc_vhid & 0xff;
struct ifaddr *ifa;
unsigned char ipad[CARP_HMAC_PAD], opad[CARP_HMAC_PAD];
int i;
/* pad keys */
/* XXX precompute ipad/opad and store in sc */
bzero(ipad, CARP_HMAC_PAD);
bzero(opad, CARP_HMAC_PAD);
bcopy(sc->sc_key, ipad, sizeof(sc->sc_key));
bcopy(sc->sc_key, opad, sizeof(sc->sc_key));
for (i = 0; i < CARP_HMAC_PAD; i++) {
ipad[i] ^= 0x36;
opad[i] ^= 0x5c;
}
/* inner hash */
SHA1Init(&sha1ctx);
SHA1Update(&sha1ctx, ipad, CARP_HMAC_PAD);
SHA1Update(&sha1ctx, (void *)&version, sizeof(version));
SHA1Update(&sha1ctx, (void *)&type, sizeof(type));
SHA1Update(&sha1ctx, (void *)&vhid, sizeof(vhid));
TAILQ_FOREACH(ifa, &sc->sc_ac.ec_if.if_addrlist, ifa_list) {
if (ifa->ifa_addr->sa_family == AF_INET)
SHA1Update(&sha1ctx,
(void *)&ifatoia(ifa)->ia_addr.sin_addr.s_addr,
sizeof(u_int32_t));
}
SHA1Update(&sha1ctx, (void *)counter, sizeof(sc->sc_counter));
SHA1Final(md, &sha1ctx);
/* outer hash */
SHA1Init(&sha1ctx);
SHA1Update(&sha1ctx, opad, CARP_HMAC_PAD);
SHA1Update(&sha1ctx, md, sizeof(*md));
SHA1Final(md, &sha1ctx);
}
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 (bcmp(md, md2, sizeof(md2)));
}
/*
* 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_input(struct mbuf *m, ...)
{
struct ifnet *ifp = m->m_pkthdr.rcvif;
struct carp_softc *sc;
struct ip *ip = mtod(m, struct ip *);
struct carp_header *ch;
int iplen, len, hlen;
va_list ap;
u_int64_t tmp_counter;
struct timeval sc_tv, ch_tv;
va_start(ap, m);
hlen = va_arg(ap, int);
va_end(ap);
carpstats.carps_ipackets++;
if (!carp_opts[CARPCTL_ALLOW]) {
m_freem(m);
return;
}
/* verify that the IP TTL is 255. */
if (ip->ip_ttl != CARP_DFLTTL) {
carpstats.carps_badttl++;
CARP_LOG("received ttl %d != 255", ip->ip_ttl);
m_freem(m);
return;
}
iplen = ip->ip_hl << 2;
if (m->m_pkthdr.len < iplen + sizeof(*ch)) {
carpstats.carps_badlen++;
CARP_LOG("received len %d < 8",
m->m_len - sizeof(struct ip));
m_freem(m);
return;
}
if (iplen + sizeof(*ch) < m->m_len) {
if ((m = m_pullup2(m, iplen + sizeof(*ch))) == NULL) {
carpstats.carps_hdrops++;
/* CARP_LOG ? */
return;
}
ip = mtod(m, struct ip *);
}
ch = (void *)(ip + iplen);
/*
* verify that the received packet length is
* equal to the CARP header
*/
len = iplen + sizeof(*ch);
if (len > m->m_pkthdr.len) {
carpstats.carps_badlen++;
CARP_LOG("packet too short %d", m->m_pkthdr.len);
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("checksum failed %d", 0);
m_freem(m);
return;
}
m->m_data -= iplen;
/* verify that the VHID is valid on the receiving interface */
TAILQ_FOREACH(sc, &((struct carp_if *)ifp->if_carp)->vhif_vrs, sc_list)
if (sc->sc_vhid == ch->carp_vhid)
break;
if (!sc || (sc->sc_ac.ec_if.if_flags & (IFF_UP|IFF_RUNNING)) !=
(IFF_UP|IFF_RUNNING)) {
carpstats.carps_badvhid++;
m_freem(m);
return;
}
sc->sc_ac.ec_if.if_lastchange = time;
sc->sc_ac.ec_if.if_ipackets++;
sc->sc_ac.ec_if.if_ibytes += m->m_pkthdr.len;
#if NBPFILTER > 0
if (sc->sc_ac.ec_if.if_bpf) {
/*
* We need to prepend the address family as
* a four byte field. Cons up a dummy header
* to pacify bpf. This is safe because bpf
* will only read from the mbuf (i.e., it won't
* try to free it or keep a pointer to it).
*/
struct mbuf m0;
u_int32_t af = htonl(AF_INET);
m0.m_next = m;
m0.m_len = sizeof(af);
m0.m_data = (char *)⁡
bpf_mtap(sc->sc_ac.ec_if.if_bpf, &m0);
}
#endif
/* verify the CARP version. */
if (ch->carp_version != CARP_VERSION) {
carpstats.carps_badver++;
sc->sc_ac.ec_if.if_ierrors++;
CARP_LOG1(sc, "invalid version %d", ch->carp_version);
m_freem(m);
return;
}
if (len < m->m_len) {
if ((m = m_pullup2(m, len)) == NULL) {
carpstats.carps_hdrops++;
sc->sc_ac.ec_if.if_ierrors++;
/* CARP_LOG ? */
m_freem(m);
return;
}
ip = mtod(m, struct ip *);
ch = mtod(m, struct carp_header *) + iplen;
}
len -= iplen;
/* verify the hash */
if (carp_hmac_verify(sc, ch->carp_counter, ch->carp_md)) {
carpstats.carps_badauth++;
sc->sc_ac.ec_if.if_ierrors++;
CARP_LOG("incorrect hash %d", 0);
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 */
if (sc->sc_init_counter)
sc->sc_init_counter = 0;
sc->sc_counter = tmp_counter;
sc_tv.tv_sec = sc->sc_advbase;
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 recieve 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, ==) &&
ip->ip_src.s_addr > sc->sc_ia->ia_addr.sin_addr.s_addr)) {
callout_stop(&sc->sc_ad_tmo);
sc->sc_state = BACKUP;
carp_setrun(sc);
}
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;
}
/*
* 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);
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.
*/
void
carpattach(int number)
{
extern int ifqmaxlen;
int i;
struct carp_softc *sc;
struct ifnet *ifp;
carp_softc = malloc(number * sizeof(*carp_softc), M_DEVBUF, M_NOWAIT);
if (!carp_softc) {
printf("cannot alloc CARP data\n");
return;
}
bzero(carp_softc, number * sizeof(*carp_softc));
carp_number = number;
for (i = 0; i < number; i++) {
sc = &carp_softc[i];
sc->sc_advbase = CARP_DFLTINTV;
sc->sc_vhid = -1; /* required setting */
sc->sc_advskew = 0;
sc->sc_init_counter = 1;
callout_init(&sc->sc_ad_tmo);
callout_init(&sc->sc_md_tmo);
ifp = &sc->sc_ac.ec_if;
ifp->if_softc = sc;
snprintf(ifp->if_xname, sizeof(ifp->if_xname), "carp%d", i);
ifp->if_mtu = ETHERMTU;
ifp->if_flags = 0;
ifp->if_ioctl = carp_ioctl;
ifp->if_output = looutput;
ifp->if_start = carp_start;
ifp->if_type = IFT_PROPVIRTUAL;
ifp->if_snd.ifq_maxlen = ifqmaxlen;
ifp->if_hdrlen = 0;
if_attach(ifp);
if_alloc_sadl(ifp);
#if NBPFILTER > 0
bpfattach(ifp, DLT_LOOP, sizeof(u_int32_t));
#endif
}
}
void
carpdetach(struct carp_softc *sc)
{
struct ifaddr *ifa;
callout_stop(&sc->sc_ad_tmo);
callout_stop(&sc->sc_md_tmo);
while ((ifa = TAILQ_FIRST(&sc->sc_ac.ec_if.if_addrlist)) != NULL)
if (ifa->ifa_addr->sa_family == AF_INET) {
struct in_ifaddr *ia = ifatoia(ifa);
carp_del_addr(sc, &ia->ia_addr);
/* ripped screaming from in_control(SIOCDIFADDR) */
in_ifscrub(&sc->sc_ac.ec_if, ia);
TAILQ_REMOVE(&sc->sc_ac.ec_if.if_addrlist, ifa, ifa_list);
TAILQ_REMOVE(&in_ifaddr, ia, ia_list);
IFAFREE((&ia->ia_ifa));
}
}
/* Detach an interface from the carp. */
void
carp_ifdetach(struct ifnet *ifp)
{
struct carp_softc *sc;
TAILQ_FOREACH(sc, &((struct carp_if *)ifp->if_carp)->vhif_vrs, sc_list)
carpdetach(sc);
}
void
carp_send_ad(void *v)
{
struct carp_softc *sc = v;
struct carp_header *ch;
struct mbuf *m;
struct m_tag *mtag;
struct ip *ip;
int len, advbase, advskew, error;
/* bow out if we've lost our UPness or RUNNINGuiness */
if ((sc->sc_ac.ec_if.if_flags &
(IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) {
advbase = 255;
advskew = 255;
} else {
advbase = sc->sc_advbase;
advskew = sc->sc_advskew;
}
carpstats.carps_opackets++;
/* MGETHDR(m, M_DONTWAIT, MT_HEADER); */
m = m_gethdr(M_DONTWAIT, MT_HEADER);
if (m == NULL) {
sc->sc_ac.ec_if.if_oerrors++;
carpstats.carps_onomem++;
/* XXX maybe less ? */
callout_reset(&sc->sc_ad_tmo, hz * sc->sc_advbase,
carp_send_ad, sc);
return;
}
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;
ip->ip_src.s_addr = sc->sc_ia->ia_addr.sin_addr.s_addr;
ip->ip_dst.s_addr = INADDR_CARP_GROUP;
ch = (void *)(ip + sizeof(*ip));
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;
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 if (sc->sc_counter == 0xffffffff) {
sc->sc_counter = 0;
} 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);
m->m_data += sizeof(*ip);
ch->carp_cksum = carp_cksum(m, len - sizeof(*ip));
m->m_data -= sizeof(*ip);
sc->sc_ac.ec_if.if_lastchange = time;
sc->sc_ac.ec_if.if_opackets++;
sc->sc_ac.ec_if.if_obytes += len;
/* Tag packet for carp_output */
mtag = m_tag_get(PACKET_TAG_CARP, sizeof(struct carp_softc *), M_NOWAIT);
if (mtag == NULL) {
m_freem(m);
sc->sc_ac.ec_if.if_oerrors++;
error = ENOMEM;
return;
}
bcopy(&sc, (caddr_t)(mtag + 1), sizeof(struct carp_softc *));
m_tag_prepend(m, mtag);
if ((error = ip_output(m, NULL, NULL, IP_RAWOUTPUT, &sc->sc_imo, NULL)))
sc->sc_ac.ec_if.if_oerrors++;
if (advbase)
callout_reset(&sc->sc_ad_tmo, hz * sc->sc_advbase,
carp_send_ad, sc);
}
/*
* 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;
TAILQ_FOREACH(ifa, &sc->sc_ac.ec_if.if_addrlist, ifa_list) {
if (ifa->ifa_addr->sa_family != AF_INET)
continue;
in = ifatoia(ifa)->ia_addr.sin_addr.s_addr;
arprequest(sc->sc_ifp, &in, &in, sc->sc_ac.ec_enaddr);
DELAY(1000); /* XXX */
}
}
int
carp_iamatch(void *v, struct in_ifaddr *ia,
struct in_addr *isaddr, u_int8_t **enaddr)
{
struct carp_if *cif = v;
struct carp_softc *vh;
int index, count = 0;
struct ifaddr *ifa;
if (carp_opts[CARPCTL_ARPBALANCE]) {
/*
* XXX proof of concept implementation.
* We use the source ip to decide which virtual host should
* handle the request. If we're master of that virtual host,
* then we respond, otherwise, just drop the arp packet on
* the floor.
*/
TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
TAILQ_FOREACH(ifa, &vh->sc_ac.ec_if.if_addrlist,
ifa_list) {
if (ia->ia_addr.sin_addr.s_addr ==
ifatoia(ifa)->ia_addr.sin_addr.s_addr)
count++;
}
}
if (count == 0) {
/* should never reach this */
return 1;
}
/* this should be a hash, like pf_hash() */
index = isaddr->s_addr % count;
TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
TAILQ_FOREACH(ifa, &vh->sc_ac.ec_if.if_addrlist,
ifa_list) {
if (ia->ia_addr.sin_addr.s_addr ==
ifatoia(ifa)->ia_addr.sin_addr.s_addr) {
if (index == 0 &&
((vh->sc_ac.ec_if.if_flags &
(IFF_UP|IFF_RUNNING)) ==
(IFF_UP|IFF_RUNNING))) {
*enaddr = vh->sc_ac.ec_enaddr;
return (1);
}
index--;
}
}
}
return (0);
} else {
TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
if ((vh->sc_ac.ec_if.if_flags & (IFF_UP|IFF_RUNNING)) ==
(IFF_UP|IFF_RUNNING) && ia->ia_ifp ==
&vh->sc_ac.ec_if) {
*enaddr = vh->sc_ac.ec_enaddr;
}
}
}
return (1);
}
struct ifnet *
carp_forus(void *v, void *dhost)
{
struct carp_if *cif = v;
struct carp_softc *vh;
u_int8_t *ena = dhost;
if (ena[0] || ena[1] || ena[2] != 0x5e || ena[3] || ena[4] != 1)
return (NULL);
TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list)
if ((vh->sc_ac.ec_if.if_flags & (IFF_UP|IFF_RUNNING)) ==
(IFF_UP|IFF_RUNNING) && vh->sc_state == MASTER &&
!bcmp(dhost, vh->sc_ac.ec_enaddr, ETHER_ADDR_LEN))
return (&vh->sc_ac.ec_if);
return (NULL);
}
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_ac.ec_if.if_xname);
break;
case MASTER:
break;
case BACKUP:
carp_send_ad(sc);
carp_send_arp(sc);
sc->sc_state = MASTER;
carp_setrun(sc);
break;
}
}
void
carp_setrun(struct carp_softc *sc)
{
struct timeval tv;
if (sc->sc_ac.ec_if.if_flags & IFF_UP &&
sc->sc_vhid > 0 && sc->sc_naddrs)
sc->sc_ac.ec_if.if_flags |= IFF_RUNNING;
else {
sc->sc_ac.ec_if.if_flags &= ~IFF_RUNNING;
return;
}
switch (sc->sc_state) {
case INIT:
if (carp_opts[CARPCTL_PREEMPT]) {
carp_send_ad(sc);
carp_send_arp(sc);
sc->sc_state = MASTER;
} else {
sc->sc_state = BACKUP;
carp_setrun(sc);
}
break;
case BACKUP:
tv.tv_sec = 3 * sc->sc_advbase;
tv.tv_usec = sc->sc_advskew * 1000000 / 256;
callout_reset(&sc->sc_md_tmo, hzto(&tv),
carp_master_down, sc);
break;
case MASTER:
tv.tv_sec = sc->sc_advbase;
tv.tv_usec = sc->sc_advskew * 1000000 / 256;
callout_reset(&sc->sc_ad_tmo, hzto(&tv),
carp_send_ad, sc);
break;
}
}
int
carp_set_addr(struct carp_softc *sc, struct sockaddr_in *sin)
{
struct ifnet *ifp;
struct carp_if *cif;
struct in_ifaddr *ia, *ia_if;
struct ip_moptions *imo = &sc->sc_imo;
struct in_addr addr;
int own, error;
if (sin->sin_addr.s_addr == 0) {
if (!(sc->sc_ac.ec_if.if_flags & IFF_UP))
sc->sc_state = INIT;
if (sc->sc_naddrs)
sc->sc_ac.ec_if.if_flags |= IFF_UP;
carp_setrun(sc);
return 0;
}
/* we have to do it by hands to check we won't match on us */
ia_if = NULL; own = 0;
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_ac.ec_if &&
(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 (sin->sin_addr.s_addr == ia->ia_addr.sin_addr.s_addr)
own++;
}
}
if (!ia_if)
return EADDRNOTAVAIL;
ia = ia_if;
ifp = ia->ia_ifp;
if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0 ||
(imo->imo_multicast_ifp && imo->imo_multicast_ifp != ifp))
return EADDRNOTAVAIL;
if (imo->imo_num_memberships == 0) {
addr.s_addr = INADDR_CARP_GROUP;
if ((imo->imo_membership[0] = in_addmulti(&addr, ifp)) == NULL)
return ENOBUFS;
imo->imo_num_memberships++;
imo->imo_multicast_ifp = ifp;
imo->imo_multicast_ttl = CARP_DFLTTL;
imo->imo_multicast_loop = 0;
}
if (!ifp->if_carp) {
MALLOC(cif, struct carp_if *, sizeof(*cif), M_IFADDR, M_WAITOK);
if (!cif || (error = ifpromisc(ifp, 1))) {
in_delmulti(imo->imo_membership[
--imo->imo_num_memberships]);
return cif? error : ENOBUFS;
}
cif->vhif_ifp = ifp;
TAILQ_INIT(&cif->vhif_vrs);
ifp->if_carp = (caddr_t)cif;
} else {
struct carp_softc *vr;
cif = (struct carp_if *)ifp->if_carp;
TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list)
if (vr != sc && vr->sc_vhid == sc->sc_vhid) {
in_delmulti(imo->imo_membership[
--imo->imo_num_memberships]);
return EINVAL;
}
}
sc->sc_ia = ia;
sc->sc_ifp = ifp;
{ /* XXX prevent endless loop if already in queue */
struct carp_softc *vr, *after = NULL;
int myself = 0;
cif = (struct carp_if *)ifp->if_carp;
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++;
}
}
sc->sc_naddrs++;
sc->sc_ac.ec_if.if_flags |= IFF_UP;
if (own)
sc->sc_advskew = 0;
sc->sc_state = INIT;
carp_setrun(sc);
return 0;
}
int
carp_del_addr(struct carp_softc *sc, struct sockaddr_in *sin)
{
int error = 0;
if (!--sc->sc_naddrs) {
struct carp_if *cif = (struct carp_if *)sc->sc_ifp->if_carp;
struct ip_moptions *imo = &sc->sc_imo;
callout_stop(&sc->sc_ad_tmo);
sc->sc_ac.ec_if.if_flags &= ~(IFF_UP|IFF_RUNNING);
sc->sc_vhid = -1;
in_delmulti(imo->imo_membership[--imo->imo_num_memberships]);
imo->imo_multicast_ifp = NULL;
TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list);
if (!--cif->vhif_nvrs) {
sc->sc_ifp->if_carp = NULL;
FREE(cif, M_IFADDR);
}
}
return error;
}
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 ifreq *ifr;
struct ifaliasreq *ifra;
register int error = 0;
ifa = (struct ifaddr *)addr;
ifra = (struct ifaliasreq *)addr;
ifr = (struct ifreq *)addr;
switch (cmd) {
case SIOCSIFADDR:
if (ifa->ifa_addr->sa_family != AF_INET) {
error = EAFNOSUPPORT;
break;
}
sc->if_flags |= IFF_UP;
error = carp_set_addr(sc, satosin(ifa->ifa_addr));
break;
case SIOCAIFADDR:
if (ifra->ifra_addr.sa_family != AF_INET) {
error = EAFNOSUPPORT;
break;
}
sc->if_flags |= IFF_UP;
error = carp_set_addr(sc, satosin(&ifra->ifra_addr));
break;
case SIOCDIFADDR:
if (ifra->ifra_addr.sa_family != AF_INET) {
error = EAFNOSUPPORT;
break;
}
sc->if_flags &= ~IFF_UP;
error = carp_del_addr(sc, satosin(&ifra->ifra_addr));
break;
case SIOCSIFFLAGS:
if (sc->if_flags & IFF_UP && (ifr->ifr_flags & IFF_UP) == 0) {
sc->if_flags &= ~IFF_UP;
callout_stop(&sc->sc_ad_tmo);
callout_stop(&sc->sc_md_tmo);
if (sc->sc_state == MASTER)
carp_send_ad(sc);
sc->sc_state = INIT;
carp_setrun(sc);
}
if (ifr->ifr_flags & IFF_UP && (sc->if_flags & IFF_UP) == 0) {
sc->if_flags |= IFF_UP;
sc->sc_state = INIT;
carp_setrun(sc);
}
break;
case SIOCSVH:
if ((error = suser(p->p_ucred, &p->p_acflag)) != 0)
break;
if ((error = copyin(ifr->ifr_data, &carpr, sizeof carpr)))
break;
error = 1;
if (carpr.carpr_vhid > 0) {
if (carpr.carpr_vhid > 255) {
error = EINVAL;
break;
}
if (sc->sc_ifp) {
struct carp_if *cif;
cif = (struct carp_if *)sc->sc_ifp->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;
sc->sc_ac.ec_enaddr[0] = 0;
sc->sc_ac.ec_enaddr[1] = 0;
sc->sc_ac.ec_enaddr[2] = 0x5e;
sc->sc_ac.ec_enaddr[3] = 0;
sc->sc_ac.ec_enaddr[4] = 1;
sc->sc_ac.ec_enaddr[5] = sc->sc_vhid;
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);
}
break;
case SIOCGVH:
bzero(&carpr, sizeof(carpr));
carpr.carpr_state = sc->sc_state;
carpr.carpr_vhid = sc->sc_vhid;
carpr.carpr_advbase = sc->sc_advbase;
carpr.carpr_advskew = sc->sc_advskew;
if (suser(p->p_ucred, &p->p_acflag) == 0)
bcopy(sc->sc_key, carpr.carpr_key,
sizeof(carpr.carpr_key));
error = copyout(&carpr, ifr->ifr_data, sizeof(carpr));
break;
default:
error = EINVAL;
}
return (error);
}
/*
* 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 m_tag *mtag;
struct carp_softc *sc;
if (sa && sa->sa_family != AF_INET)
return 0;
mtag = m_tag_find(m, PACKET_TAG_CARP, NULL);
if (mtag == NULL)
return 0;
bcopy( mtag + 1, &sc, sizeof(struct carp_softc *));
/* Set the source MAC address to Virtual Router MAC Address */
switch (ifp->if_type) {
#if NETHER > 0
case IFT_ETHER: {
register struct ether_header *eh;
eh = mtod(m, struct ether_header *);
eh->ether_shost[0] = 0;
eh->ether_shost[1] = 0;
eh->ether_shost[2] = 0x5e;
eh->ether_shost[3] = 0;
eh->ether_shost[4] = 1;
eh->ether_shost[5] = sc->sc_vhid;
}
break;
#endif
#if NFDDI > 0
case IFT_FDDI: {
register struct fddi_header *fh;
fh = mtod(m, struct fddi_header *);
fh->fddi_shost[0] = 0;
fh->fddi_shost[1] = 0;
fh->fddi_shost[2] = 0x5e;
fh->fddi_shost[3] = 0;
fh->fddi_shost[4] = 1;
fh->fddi_shost[5] = sc->sc_vhid;
}
break;
#endif
#if NTOKEN > 0
case IFT_ISO88025: {
register struct token_header *th;
th = mtod(m, struct token_header *);
th->token_shost[0] = 3;
th->token_shost[1] = 0;
th->token_shost[2] = 0x40 >> (sc->sc_vhid - 1);
th->token_shost[3] = 0x40000 >> (sc->sc_vhid - 1);
th->token_shost[4] = 0;
th->token_shost[5] = 0;
}
break;
#endif
default:
printf("%s: carp is not supported for this interface type\n",
ifp->if_xname);
return EOPNOTSUPP;
}
return 0;
}
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