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Allow carp(4) to be loaded as a kernel module. Follow precedent set by

Browse Source 
bridge(4), lagg(4) etc. and make use of function pointers and
pf_proto_register() to hook carp into the network stack.

Currently, because of the uncertainty about whether the unload path is free
of race condition panics, unloads are disallowed by default.  Compiling with
CARPMOD_CAN_UNLOAD in CFLAGS removes this anti foot shooting measure.

This commit requires IP6PROTOSPACER, introduced in r211115.

Reviewed by:	bz, simon
Approved by:	ken (mentor)
MFC after:	2 weeks
This commit is contained in:
Will Andrews 2010-08-11 00:51:50 +00:00
parent 828160e93c
commit 54bfbd5153
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=211157
13 changed files with 214 additions and 149 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
sys/modules/Makefile
View File

@ -112,6 +112,7 @@ SUBDIR= ${_3dfx} \
${_ida} \
${_ie} \
if_bridge \
if_carp \
if_disc \
if_edsc \
if_ef \

21
sys/modules/if_carp/Makefile Normal file
View File

@ -0,0 +1,21 @@
# $FreeBSD$
.PATH: ${.CURDIR}/../../netinet
.include <bsd.own.mk>
KMOD= if_carp
SRCS= ip_carp.c
SRCS+= opt_carp.h opt_bpf.h opt_inet.h opt_inet6.h vnode_if.h
.if !defined(KERNBUILDDIR)
opt_inet.h:
@echo "#define INET 1" > ${.TARGET}
.if ${MK_INET6_SUPPORT} != "no"
opt_inet6.h:
@echo "#define INET6 1" > ${.TARGET}
.endif
.endif
.include <bsd.kmod.mk>

25
sys/net/if.c
View File

@ -33,7 +33,6 @@
#include "opt_compat.h"
#include "opt_inet6.h"
#include "opt_inet.h"
#include "opt_carp.h"
#include "opt_ddb.h"
#include <sys/param.h>
@ -89,11 +88,6 @@
#ifdef INET
#include <netinet/if_ether.h>
#endif
#if defined(INET) || defined(INET6)
#ifdef DEV_CARP
#include <netinet/ip_carp.h>
#endif
#endif
#include <security/mac/mac_framework.h>
@ -130,6 +124,7 @@ SX_SYSINIT(ifdescr_sx, &ifdescr_sx, "ifnet descr");
void (*bstp_linkstate_p)(struct ifnet *ifp, int state);
void (*ng_ether_link_state_p)(struct ifnet *ifp, int state);
void (*lagg_linkstate_p)(struct ifnet *ifp, int state);
void (*carp_linkstate_p)(struct ifnet *ifp);
struct mbuf *(*tbr_dequeue_ptr)(struct ifaltq *, int) = NULL;
@ -1813,12 +1808,8 @@ if_unroute(struct ifnet *ifp, int flag, int fam)
pfctlinput(PRC_IFDOWN, ifa->ifa_addr);
ifp->if_qflush(ifp);
#if defined(INET) || defined(INET6)
#ifdef DEV_CARP
if (ifp->if_carp)
carp_carpdev_state(ifp->if_carp);
#endif
#endif
(*carp_linkstate_p)(ifp);
rt_ifmsg(ifp);
}
@ -1839,12 +1830,8 @@ if_route(struct ifnet *ifp, int flag, int fam)
TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family))
pfctlinput(PRC_IFUP, ifa->ifa_addr);
#if defined(INET) || defined(INET6)
#ifdef DEV_CARP
if (ifp->if_carp)
carp_carpdev_state(ifp->if_carp);
#endif
#endif
(*carp_linkstate_p)(ifp);
rt_ifmsg(ifp);
#ifdef INET6
in6_if_up(ifp);
@ -1887,12 +1874,8 @@ do_link_state_change(void *arg, int pending)
if ((ifp->if_type == IFT_ETHER || ifp->if_type == IFT_L2VLAN) &&
IFP2AC(ifp)->ac_netgraph != NULL)
(*ng_ether_link_state_p)(ifp, link_state);
#if defined(INET) || defined(INET6)
#ifdef DEV_CARP
if (ifp->if_carp)
carp_carpdev_state(ifp->if_carp);
#endif
#endif
(*carp_linkstate_p)(ifp);
if (ifp->if_bridge) {
KASSERT(bstp_linkstate_p != NULL,("if_bridge bstp not loaded!"));
(*bstp_linkstate_p)(ifp, link_state);

13
sys/net/if_bridge.c
View File

@ -79,7 +79,6 @@ __FBSDID("$FreeBSD$");
#include "opt_inet.h"
#include "opt_inet6.h"
#include "opt_carp.h"
#include <sys/param.h>
#include <sys/mbuf.h>
@ -121,10 +120,8 @@ __FBSDID("$FreeBSD$");
#include <netinet6/ip6_var.h>
#endif
#if defined(INET) || defined(INET6)
#ifdef DEV_CARP
#include <netinet/ip_carp.h>
#endif
#endif
#include <machine/in_cksum.h>
#include <netinet/if_ether.h> /* for struct arpcom */
#include <net/bridgestp.h>
@ -2144,6 +2141,10 @@ bridge_forward(struct bridge_softc *sc, struct bridge_iflist *sbif,
m_freem(m);
}
#if defined(INET) || defined(INET6)
int (*carp_forus_p)(struct carp_if *, u_char *);
#endif
/*
* bridge_input:
*
@ -2252,13 +2253,13 @@ bridge_input(struct ifnet *ifp, struct mbuf *m)
return (m);
}
#if (defined(INET) || defined(INET6)) && defined(DEV_CARP)
#if (defined(INET) || defined(INET6))
# define OR_CARP_CHECK_WE_ARE_DST(iface) \
|| ((iface)->if_carp \
&& carp_forus((iface)->if_carp, eh->ether_dhost))
&& (*carp_forus_p)((iface)->if_carp, eh->ether_dhost))
# define OR_CARP_CHECK_WE_ARE_SRC(iface) \
|| ((iface)->if_carp \
&& carp_forus((iface)->if_carp, eh->ether_shost))
&& (*carp_forus_p)((iface)->if_carp, eh->ether_shost))
#else
# define OR_CARP_CHECK_WE_ARE_DST(iface)
# define OR_CARP_CHECK_WE_ARE_SRC(iface)

21
sys/net/if_ethersubr.c
View File

@ -35,7 +35,6 @@
#include "opt_inet6.h"
#include "opt_ipx.h"
#include "opt_netgraph.h"
#include "opt_carp.h"
#include "opt_mbuf_profiling.h"
#include <sys/param.h>
@ -70,6 +69,7 @@
#include <netinet/in.h>
#include <netinet/in_var.h>
#include <netinet/if_ether.h>
#include <netinet/ip_carp.h>
#include <netinet/ip_var.h>
#include <netinet/ip_fw.h>
#include <netinet/ipfw/ip_fw_private.h>
@ -78,12 +78,6 @@
#include <netinet6/nd6.h>
#endif
#if defined(INET) || defined(INET6)
#ifdef DEV_CARP
#include <netinet/ip_carp.h>
#endif
#endif
#ifdef IPX
#include <netipx/ipx.h>
#include <netipx/ipx_if.h>
@ -120,6 +114,11 @@ void (*ng_ether_attach_p)(struct ifnet *ifp);
void (*ng_ether_detach_p)(struct ifnet *ifp);
void (*vlan_input_p)(struct ifnet *, struct mbuf *);
#if defined(INET) || defined(INET6)
int (*carp_forus_p)(struct ifnet *, u_char *);
int (*carp_output_p)(struct ifnet *, struct mbuf *, struct sockaddr *,
struct rtentry *);
#endif
/* if_bridge(4) support */
struct mbuf *(*bridge_input_p)(struct ifnet *, struct mbuf *);
@ -399,11 +398,9 @@ ether_output(struct ifnet *ifp, struct mbuf *m,
}
#if defined(INET) || defined(INET6)
#ifdef DEV_CARP
if (ifp->if_carp &&
(error = carp_output(ifp, m, dst, NULL)))
(error = (*carp_output_p)(ifp, m, dst, NULL)))
goto bad;
#endif
#endif
/* Handle ng_ether(4) processing, if any */
@ -724,7 +721,6 @@ ether_input(struct ifnet *ifp, struct mbuf *m)
}
#if defined(INET) || defined(INET6)
#ifdef DEV_CARP
/*
* Clear M_PROMISC on frame so that carp(4) will see it when the
* mbuf flows up to Layer 3.
@ -735,10 +731,9 @@ ether_input(struct ifnet *ifp, struct mbuf *m)
* TODO: Maintain a hash table of ethernet addresses other than
* ether_dhost which may be active on this ifp.
*/
if (ifp->if_carp && carp_forus(ifp->if_carp, eh->ether_dhost)) {
if (ifp->if_carp && (*carp_forus_p)(ifp, eh->ether_dhost)) {
m->m_flags &= ~M_PROMISC;
} else
#endif
#endif
{
/*

21
sys/netinet/if_ether.c
View File

@ -39,7 +39,6 @@
__FBSDID("$FreeBSD$");
#include "opt_inet.h"
#include "opt_carp.h"
#include <sys/param.h>
#include <sys/kernel.h>
@ -69,10 +68,6 @@ __FBSDID("$FreeBSD$");
#include <net/if_arc.h>
#include <net/iso88025.h>
#ifdef DEV_CARP
#include <netinet/ip_carp.h>
#endif
#include <security/mac/mac_framework.h>
#define SIN(s) ((struct sockaddr_in *)s)
@ -123,6 +118,10 @@ static void arptimer(void *);
#ifdef INET
static void in_arpinput(struct mbuf *);
#endif
#if defined(INET) || defined(INET6)
int (*carp_iamatch_p)(struct ifnet *, struct in_ifaddr *, struct in_addr *,
u_int8_t **);
#endif
static const struct netisr_handler arp_nh = {
.nh_name = "arp",
@ -494,9 +493,7 @@ in_arpinput(struct mbuf *m)
int op, flags;
int req_len;
int bridged = 0, is_bridge = 0;
#ifdef DEV_CARP
int carp_match = 0;
#endif
struct sockaddr_in sin;
sin.sin_len = sizeof(struct sockaddr_in);
sin.sin_family = AF_INET;
@ -539,16 +536,14 @@ in_arpinput(struct mbuf *m)
IN_IFADDR_RUNLOCK();
goto match;
}
#ifdef DEV_CARP
if (ifp->if_carp != NULL &&
carp_iamatch(ifp->if_carp, ia, &isaddr, &enaddr) &&
(*carp_iamatch_p)(ifp, ia, &isaddr, &enaddr) &&
itaddr.s_addr == ia->ia_addr.sin_addr.s_addr) {
carp_match = 1;
ifa_ref(&ia->ia_ifa);
IN_IFADDR_RUNLOCK();
goto match;
}
#endif
}
LIST_FOREACH(ia, INADDR_HASH(isaddr.s_addr), ia_hash)
if (((bridged && ia->ia_ifp->if_bridge != NULL) ||
@ -648,11 +643,7 @@ in_arpinput(struct mbuf *m)
IF_AFDATA_UNLOCK(ifp);
if (la != NULL) {
/* the following is not an error when doing bridging */
if (!bridged && la->lle_tbl->llt_ifp != ifp
#ifdef DEV_CARP
&& (ifp->if_type != IFT_CARP || !carp_match)
#endif
) {
if (!bridged && la->lle_tbl->llt_ifp != ifp && !carp_match) {
if (log_arp_wrong_iface)
log(LOG_ERR, "arp: %s is on %s "
"but got reply from %*D on %s\n",

9
sys/netinet/in.c
View File

@ -33,7 +33,6 @@
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "opt_carp.h"
#include "opt_mpath.h"
#include <sys/param.h>
@ -891,13 +890,11 @@ in_ifinit(struct ifnet *ifp, struct in_ifaddr *ia, struct sockaddr_in *sin,
ia->ia_net = i & ia->ia_netmask;
ia->ia_subnet = i & ia->ia_subnetmask;
in_socktrim(&ia->ia_sockmask);
#ifdef DEV_CARP
/*
* XXX: carp(4) does not have interface route
*/
if (ifp->if_type == IFT_CARP)
return (0);
#endif
/*
* Add route for the network.
*/
@ -1152,12 +1149,12 @@ in_scrubprefix(struct in_ifaddr *target)
* the route itself to it. Make sure that routing daemons
* get a heads-up.
*
* XXX: a special case for carp(4) interface
* XXX: a special case for carp(4) interface - this should
* be more generally specified as an interface that
* doesn't support such action.
*/
if ((ia->ia_flags & IFA_ROUTE) == 0
#ifdef DEV_CARP
&& (ia->ia_ifp->if_type != IFT_CARP)
#endif
) {
IN_IFADDR_RUNLOCK();
rtinit(&(target->ia_ifa), (int)RTM_DELETE,

20
sys/netinet/in_proto.c
View File

@ -37,7 +37,6 @@ __FBSDID("$FreeBSD$");
#include "opt_ipsec.h"
#include "opt_inet6.h"
#include "opt_pf.h"
#include "opt_carp.h"
#include "opt_sctp.h"
#include "opt_mpath.h"
@ -94,10 +93,6 @@ static struct pr_usrreqs nousrreqs;
#include <net/if_pfsync.h>
#endif
#ifdef DEV_CARP
#include <netinet/ip_carp.h>
#endif
extern struct domain inetdomain;
/* Spacer for loadable protocols. */
@ -330,18 +325,6 @@ struct protosw inetsw[] = {
.pr_usrreqs = &rip_usrreqs
},
#endif /* DEV_PFSYNC */
#ifdef DEV_CARP
{
.pr_type = SOCK_RAW,
.pr_domain = &inetdomain,
.pr_protocol = IPPROTO_CARP,
.pr_flags = PR_ATOMIC|PR_ADDR,
.pr_input = carp_input,
.pr_output = (pr_output_t*)rip_output,
.pr_ctloutput = rip_ctloutput,
.pr_usrreqs = &rip_usrreqs
},
#endif /* DEV_CARP */
/* Spacer n-times for loadable protocols. */
IPPROTOSPACER,
IPPROTOSPACER,
@ -413,6 +396,3 @@ SYSCTL_NODE(_net_inet, IPPROTO_RAW, raw, CTLFLAG_RW, 0, "RAW");
#ifdef DEV_PFSYNC
SYSCTL_NODE(_net_inet, IPPROTO_PFSYNC, pfsync, CTLFLAG_RW, 0, "PFSYNC");
#endif
#ifdef DEV_CARP
SYSCTL_NODE(_net_inet, IPPROTO_CARP, carp, CTLFLAG_RW, 0, "CARP");
#endif

176
sys/netinet/ip_carp.c
View File

@ -27,7 +27,6 @@
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "opt_carp.h"
#include "opt_bpf.h"
#include "opt_inet.h"
#include "opt_inet6.h"
@ -44,6 +43,7 @@ __FBSDID("$FreeBSD$");
#include <sys/time.h>
#include <sys/priv.h>
#include <sys/proc.h>
#include <sys/protosw.h>
#include <sys/sysctl.h>
#include <sys/syslog.h>
#include <sys/signalvar.h>
@ -79,6 +79,7 @@ __FBSDID("$FreeBSD$");
#ifdef INET6
#include <netinet/icmp6.h>
#include <netinet/ip6.h>
#include <netinet6/ip6protosw.h>
#include <netinet6/ip6_var.h>
#include <netinet6/scope6_var.h>
#include <netinet6/nd6.h>
@ -134,8 +135,29 @@ struct carp_softc {
};
#define SC2IFP(sc) ((sc)->sc_ifp)
/* These are external networking stack hooks for CARP */
/* net/if.c */
extern void (*carp_linkstate_p)(struct ifnet *);
/* net/if_bridge.c net/if_ethersubr.c */
extern struct ifnet *(*carp_forus_p)(struct ifnet *, u_char *);
/* net/if_ethersubr.c */
extern int (*carp_output_p)(struct ifnet *, struct mbuf *,
struct sockaddr *, struct rtentry *);
#ifdef INET
/* netinet/if_ether.c */
extern int (*carp_iamatch_p)(struct ifnet *, struct in_ifaddr *,
struct in_addr *, u_int8_t **);
#endif
#ifdef INET6
/* netinet6/nd6_nbr.c */
extern struct ifaddr *(*carp_iamatch6_p)(struct ifnet *, struct in6_addr *);
extern caddr_t (*carp_macmatch6_p)(struct ifnet *, struct mbuf *,
const struct in6_addr *);
#endif
int carp_suppress_preempt = 0;
int carp_opts[CARPCTL_MAXID] = { 0, 1, 0, 1, 0, 0 }; /* XXX for now */
SYSCTL_NODE(_net_inet, IPPROTO_CARP, carp, CTLFLAG_RW, 0, "CARP");
SYSCTL_INT(_net_inet_carp, CARPCTL_ALLOW, allow, CTLFLAG_RW,
&carp_opts[CARPCTL_ALLOW], 0, "Accept incoming CARP packets");
SYSCTL_INT(_net_inet_carp, CARPCTL_PREEMPT, preempt, CTLFLAG_RW,
@ -160,6 +182,10 @@ struct carp_if {
struct mtx vhif_mtx;
};
#define CARP_INET 0
#define CARP_INET6 1
static int proto_reg[] = {-1, -1};
/* Get carp_if from softc. Valid after carp_set_addr{,6}. */
#define SC2CIF(sc) ((struct carp_if *)(sc)->sc_carpdev->if_carp)
@ -1146,14 +1172,15 @@ carp_addrcount(struct carp_if *cif, struct in_ifaddr *ia, int type)
}
int
carp_iamatch(void *v, struct in_ifaddr *ia,
carp_iamatch(struct ifnet *ifp, struct in_ifaddr *ia,
struct in_addr *isaddr, u_int8_t **enaddr)
{
struct carp_if *cif = v;
struct carp_if *cif;
struct carp_softc *vh;
int index, count = 0;
struct ifaddr *ifa;
cif = ifp->if_carp;
CARP_LOCK(cif);
if (carp_opts[CARPCTL_ARPBALANCE]) {
@ -1222,12 +1249,13 @@ carp_iamatch(void *v, struct in_ifaddr *ia,
#ifdef INET6
struct ifaddr *
carp_iamatch6(void *v, struct in6_addr *taddr)
carp_iamatch6(struct ifnet *ifp, struct in6_addr *taddr)
{
struct carp_if *cif = v;
struct carp_if *cif;
struct carp_softc *vh;
struct ifaddr *ifa;
cif = ifp->if_carp;
CARP_LOCK(cif);
TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
IF_ADDR_LOCK(SC2IFP(vh));
@ -1250,14 +1278,15 @@ carp_iamatch6(void *v, struct in6_addr *taddr)
return (NULL);
}
void *
carp_macmatch6(void *v, struct mbuf *m, const struct in6_addr *taddr)
caddr_t
carp_macmatch6(struct ifnet *ifp, struct mbuf *m, const struct in6_addr *taddr)
{
struct m_tag *mtag;
struct carp_if *cif = v;
struct carp_if *cif;
struct carp_softc *sc;
struct ifaddr *ifa;
cif = ifp->if_carp;
CARP_LOCK(cif);
TAILQ_FOREACH(sc, &cif->vhif_vrs, sc_list) {
IF_ADDR_LOCK(SC2IFP(sc));
@ -1293,15 +1322,16 @@ carp_macmatch6(void *v, struct mbuf *m, const struct in6_addr *taddr)
#endif
struct ifnet *
carp_forus(void *v, void *dhost)
carp_forus(struct ifnet *ifp, u_char *dhost)
{
struct carp_if *cif = v;
struct carp_if *cif;
struct carp_softc *vh;
u_int8_t *ena = dhost;
if (ena[0] || ena[1] || ena[2] != 0x5e || ena[3] || ena[4] != 1)
return (NULL);
cif = ifp->if_carp;
CARP_LOCK(cif);
TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list)
if ((SC2IFP(vh)->if_flags & IFF_UP) &&
@ -2210,10 +2240,11 @@ carp_set_state(struct carp_softc *sc, int state)
}
void
carp_carpdev_state(void *v)
carp_carpdev_state(struct ifnet *ifp)
{
struct carp_if *cif = v;
struct carp_if *cif;
cif = ifp->if_carp;
CARP_LOCK(cif);
carp_carpdev_state_locked(cif);
CARP_UNLOCK(cif);
@ -2264,24 +2295,121 @@ carp_sc_state_locked(struct carp_softc *sc)
return;
}
#ifdef INET
extern struct domain inetdomain;
static struct protosw in_carp_protosw = {
.pr_type = SOCK_RAW,
.pr_domain = &inetdomain,
.pr_protocol = IPPROTO_CARP,
.pr_flags = PR_ATOMIC|PR_ADDR,
.pr_input = carp_input,
.pr_output = (pr_output_t *)rip_output,
.pr_ctloutput = rip_ctloutput,
.pr_usrreqs = &rip_usrreqs
};
#endif
#ifdef INET6
extern struct domain inet6domain;
static struct ip6protosw in6_carp_protosw = {
.pr_type = SOCK_RAW,
.pr_domain = &inet6domain,
.pr_protocol = IPPROTO_CARP,
.pr_flags = PR_ATOMIC|PR_ADDR,
.pr_input = carp6_input,
.pr_output = rip6_output,
.pr_ctloutput = rip6_ctloutput,
.pr_usrreqs = &rip6_usrreqs
};
#endif
static void
carp_mod_cleanup(void)
{
if (if_detach_event_tag == NULL)
return;
EVENTHANDLER_DEREGISTER(ifnet_departure_event, if_detach_event_tag);
if_clone_detach(&carp_cloner);
#ifdef INET
if (proto_reg[CARP_INET] == 0) {
pf_proto_unregister(PF_INET, IPPROTO_CARP, SOCK_RAW);
proto_reg[CARP_INET] = -1;
}
carp_iamatch_p = NULL;
#endif
#ifdef INET6
if (proto_reg[CARP_INET6] == 0) {
pf_proto_unregister(PF_INET6, IPPROTO_CARP, SOCK_RAW);
proto_reg[CARP_INET6] = -1;
}
carp_iamatch6_p = NULL;
carp_macmatch6_p = NULL;
#endif
carp_linkstate_p = NULL;
carp_forus_p = NULL;
carp_output_p = NULL;
mtx_destroy(&carp_mtx);
}
static int
carp_mod_load(void)
{
if_detach_event_tag = EVENTHANDLER_REGISTER(ifnet_departure_event,
carp_ifdetach, NULL, EVENTHANDLER_PRI_ANY);
if (if_detach_event_tag == NULL)
return (ENOMEM);
mtx_init(&carp_mtx, "carp_mtx", NULL, MTX_DEF);
LIST_INIT(&carpif_list);
if_clone_attach(&carp_cloner);
carp_linkstate_p = carp_carpdev_state;
carp_forus_p = carp_forus;
carp_output_p = carp_output;
#ifdef INET6
carp_iamatch6_p = carp_iamatch6;
carp_macmatch6_p = carp_macmatch6;
proto_reg[CARP_INET6] = pf_proto_register(PF_INET6,
(struct protosw *)&in6_carp_protosw);
if (proto_reg[CARP_INET6] != 0) {
printf("carp: error %d attaching to PF_INET6\n",
proto_reg[CARP_INET6]);
carp_mod_cleanup();
return (EINVAL);
}
#endif
#ifdef INET
carp_iamatch_p = carp_iamatch;
proto_reg[CARP_INET] = pf_proto_register(PF_INET, &in_carp_protosw);
if (proto_reg[CARP_INET] != 0) {
printf("carp: error %d attaching to PF_INET\n",
proto_reg[CARP_INET]);
carp_mod_cleanup();
return (EINVAL);
}
#endif
return 0;
}
static int
carp_modevent(module_t mod, int type, void *data)
{
switch (type) {
case MOD_LOAD:
if_detach_event_tag = EVENTHANDLER_REGISTER(ifnet_departure_event,
carp_ifdetach, NULL, EVENTHANDLER_PRI_ANY);
if (if_detach_event_tag == NULL)
return (ENOMEM);
mtx_init(&carp_mtx, "carp_mtx", NULL, MTX_DEF);
LIST_INIT(&carpif_list);
if_clone_attach(&carp_cloner);
break;
return carp_mod_load();
/* NOTREACHED */
case MOD_UNLOAD:
EVENTHANDLER_DEREGISTER(ifnet_departure_event, if_detach_event_tag);
if_clone_detach(&carp_cloner);
mtx_destroy(&carp_mtx);
/*
* XXX: For now, disallow module unloading by default due to
* a race condition where a thread may dereference one of the
* function pointer hooks after the module has been
* unloaded, during processing of a packet, causing a panic.
*/
#ifdef CARPMOD_CAN_UNLOAD
carp_mod_cleanup();
#else
return (EBUSY);
#endif
break;
default:

10
sys/netinet/ip_carp.h
View File

@ -157,15 +157,15 @@ struct carpreq {
}
#ifdef _KERNEL
void carp_carpdev_state(void *);
void carp_carpdev_state(struct ifnet *);
void carp_input (struct mbuf *, int);
int carp6_input (struct mbuf **, int *, int);
int carp_output (struct ifnet *, struct mbuf *, struct sockaddr *,
struct rtentry *);
int carp_iamatch (void *, struct in_ifaddr *, struct in_addr *,
int carp_iamatch (struct ifnet *, struct in_ifaddr *, struct in_addr *,
u_int8_t **);
struct ifaddr *carp_iamatch6(void *, struct in6_addr *);
void *carp_macmatch6(void *, struct mbuf *, const struct in6_addr *);
struct ifnet *carp_forus (void *, void *);
struct ifaddr *carp_iamatch6(struct ifnet *, struct in6_addr *);
caddr_t carp_macmatch6(struct ifnet *, struct mbuf *, const struct in6_addr *);
struct ifnet *carp_forus (struct ifnet *, u_char *);
#endif
#endif /* _IP_CARP_H */

8
sys/netinet/ip_input.c
View File

@ -37,7 +37,6 @@ __FBSDID("$FreeBSD$");
#include "opt_ipstealth.h"
#include "opt_ipsec.h"
#include "opt_route.h"
#include "opt_carp.h"
#include <sys/param.h>
#include <sys/systm.h>
@ -74,9 +73,7 @@ __FBSDID("$FreeBSD$");
#include <netinet/ip_icmp.h>
#include <netinet/ip_options.h>
#include <machine/in_cksum.h>
#ifdef DEV_CARP
#include <netinet/ip_carp.h>
#endif
#ifdef IPSEC
#include <netinet/ip_ipsec.h>
#endif /* IPSEC */
@ -606,10 +603,7 @@ ip_input(struct mbuf *m)
*/
checkif = V_ip_checkinterface && (V_ipforwarding == 0) &&
ifp != NULL && ((ifp->if_flags & IFF_LOOPBACK) == 0) &&
#ifdef DEV_CARP
!ifp->if_carp &&
#endif
(dchg == 0);
ifp->if_carp == NULL && (dchg == 0);
/*
* Check for exact addresses in the hash bucket.

17
sys/netinet6/in6_proto.c
View File

@ -67,7 +67,6 @@ __FBSDID("$FreeBSD$");
#include "opt_inet6.h"
#include "opt_ipsec.h"
#include "opt_ipstealth.h"
#include "opt_carp.h"
#include "opt_sctp.h"
#include "opt_mpath.h"
#include "opt_route.h"
@ -112,10 +111,6 @@ __FBSDID("$FreeBSD$");
#include <netinet6/pim6_var.h>
#include <netinet6/nd6.h>
#ifdef DEV_CARP
#include <netinet/ip_carp.h>
#endif
#ifdef SCTP
#include <netinet/in_pcb.h>
#include <netinet/sctp_pcb.h>
@ -336,18 +331,6 @@ struct ip6protosw inet6sw[] = {
.pr_ctloutput = rip6_ctloutput,
.pr_usrreqs = &rip6_usrreqs
},
#ifdef DEV_CARP
{
.pr_type = SOCK_RAW,
.pr_domain = &inet6domain,
.pr_protocol = IPPROTO_CARP,
.pr_flags = PR_ATOMIC|PR_ADDR,
.pr_input = carp6_input,
.pr_output = rip6_output,
.pr_ctloutput = rip6_ctloutput,
.pr_usrreqs = &rip6_usrreqs
},
#endif /* DEV_CARP */
/* Spacer n-times for loadable protocols. */
IP6PROTOSPACER,
IP6PROTOSPACER,

21
sys/netinet6/nd6_nbr.c
View File

@ -35,7 +35,6 @@ __FBSDID("$FreeBSD$");
#include "opt_inet.h"
#include "opt_inet6.h"
#include "opt_ipsec.h"
#include "opt_carp.h"
#include "opt_mpath.h"
#include <sys/param.h>
@ -74,10 +73,6 @@ __FBSDID("$FreeBSD$");
#include <netinet6/nd6.h>
#include <netinet/icmp6.h>
#ifdef DEV_CARP
#include <netinet/ip_carp.h>
#endif
#define SDL(s) ((struct sockaddr_dl *)s)
struct dadq;
@ -89,6 +84,10 @@ static void nd6_dad_ns_output(struct dadq *, struct ifaddr *);
static void nd6_dad_ns_input(struct ifaddr *);
static void nd6_dad_na_input(struct ifaddr *);
struct ifaddr *(*carp_iamatch6_p)(struct ifnet *, struct in6_addr *);
caddr_t (*carp_macmatch6_p)(struct ifnet *, struct mbuf *,
const struct in6_addr *);
VNET_DEFINE(int, dad_ignore_ns) = 0; /* ignore NS in DAD - specwise incorrect*/
VNET_DEFINE(int, dad_maxtry) = 15; /* max # of *tries* to transmit DAD packet */
#define V_dad_ignore_ns VNET(dad_ignore_ns)
@ -222,14 +221,10 @@ nd6_ns_input(struct mbuf *m, int off, int icmp6len)
* (3) "tentative" address on which DAD is being performed.
*/
/* (1) and (3) check. */
#ifdef DEV_CARP
if (ifp->if_carp)
ifa = carp_iamatch6(ifp->if_carp, &taddr6);
ifa = (*carp_iamatch6_p)(ifp, &taddr6);
if (ifa == NULL)
ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6);
#else
ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6);
#endif
/* (2) check. */
if (ifa == NULL) {
@ -1029,14 +1024,10 @@ nd6_na_output(struct ifnet *ifp, const struct in6_addr *daddr6_0,
* my address) use lladdr configured for the interface.
*/
if (sdl0 == NULL) {
#ifdef DEV_CARP
if (ifp->if_carp)
mac = carp_macmatch6(ifp->if_carp, m, taddr6);
mac = (*carp_macmatch6_p)(ifp, m, taddr6);
if (mac == NULL)
mac = nd6_ifptomac(ifp);
#else
mac = nd6_ifptomac(ifp);
#endif
} else if (sdl0->sa_family == AF_LINK) {
struct sockaddr_dl *sdl;
sdl = (struct sockaddr_dl *)sdl0;