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The statically configured (permanent) ARP entries are removed when an

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interface is brought down, even though the interface address is still
valid. This patch maintains the permanent ARP entries as long as the
interface address (having the same prefix as that of the ARP entries)
is valid.

Reviewed by:	delphij
MFC after:	5 days
This commit is contained in:
Qing Li 2011-05-20 19:12:20 +00:00
parent 7ba75dc4e9
commit 5b84dc789a
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=222143
6 changed files with 47 additions and 24 deletions
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5
sys/net/if_llatbl.c
View File

@ -228,7 +228,8 @@ lltable_drain(int af)
#endif
void
lltable_prefix_free(int af, struct sockaddr *prefix, struct sockaddr *mask)
lltable_prefix_free(int af, struct sockaddr *prefix, struct sockaddr *mask,
u_int flags)
{
struct lltable *llt;
@ -237,7 +238,7 @@ lltable_prefix_free(int af, struct sockaddr *prefix, struct sockaddr *mask)
if (llt->llt_af != af)
continue;
llt->llt_prefix_free(llt, prefix, mask);
llt->llt_prefix_free(llt, prefix, mask, flags);
}
LLTABLE_RUNLOCK();
}

5
sys/net/if_llatbl.h
View File

@ -155,7 +155,8 @@ struct lltable {
void (*llt_free)(struct lltable *, struct llentry *);
void (*llt_prefix_free)(struct lltable *,
const struct sockaddr *prefix,
const struct sockaddr *mask);
const struct sockaddr *mask,
u_int flags);
struct llentry * (*llt_lookup)(struct lltable *, u_int flags,
const struct sockaddr *l3addr);
int (*llt_rtcheck)(struct ifnet *, u_int flags,
@ -184,7 +185,7 @@ MALLOC_DECLARE(M_LLTABLE);
struct lltable *lltable_init(struct ifnet *, int);
void lltable_free(struct lltable *);
void lltable_prefix_free(int, struct sockaddr *,
struct sockaddr *);
struct sockaddr *, u_int);
#if 0
void lltable_drain(int);
#endif

40
sys/netinet/in.c
View File

@ -70,7 +70,7 @@ static int in_lifaddr_ioctl(struct socket *, u_long, caddr_t,
struct ifnet *, struct thread *);
static int in_addprefix(struct in_ifaddr *, int);
static int in_scrubprefix(struct in_ifaddr *);
static int in_scrubprefix(struct in_ifaddr *, u_int);
static void in_socktrim(struct sockaddr_in *);
static int in_ifinit(struct ifnet *,
struct in_ifaddr *, struct sockaddr_in *, int);
@ -548,7 +548,7 @@ in_control(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp,
* is the same as before, then the call is
* un-necessarily executed here.
*/
in_ifscrub(ifp, ia);
in_ifscrub(ifp, ia, 0);
ia->ia_sockmask = ifra->ifra_mask;
ia->ia_sockmask.sin_family = AF_INET;
ia->ia_subnetmask =
@ -557,7 +557,7 @@ in_control(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp,
}
if ((ifp->if_flags & IFF_POINTOPOINT) &&
(ifra->ifra_dstaddr.sin_family == AF_INET)) {
in_ifscrub(ifp, ia);
in_ifscrub(ifp, ia, 0);
ia->ia_dstaddr = ifra->ifra_dstaddr;
maskIsNew = 1; /* We lie; but the effect's the same */
}
@ -585,7 +585,7 @@ in_control(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp,
/*
* in_ifscrub kills the interface route.
*/
in_ifscrub(ifp, ia);
in_ifscrub(ifp, ia, LLE_STATIC);
/*
* in_ifadown gets rid of all the rest of
@ -829,10 +829,10 @@ in_lifaddr_ioctl(struct socket *so, u_long cmd, caddr_t data,
* Delete any existing route for an interface.
*/
void
in_ifscrub(struct ifnet *ifp, struct in_ifaddr *ia)
in_ifscrub(struct ifnet *ifp, struct in_ifaddr *ia, u_int flags)
{
in_scrubprefix(ia);
in_scrubprefix(ia, flags);
}
/*
@ -887,7 +887,7 @@ in_ifinit(struct ifnet *ifp, struct in_ifaddr *ia, struct sockaddr_in *sin,
splx(s);
if (scrub) {
ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr;
in_ifscrub(ifp, ia);
in_ifscrub(ifp, ia, LLE_STATIC);
ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
}
if (IN_CLASSA(i))
@ -1095,7 +1095,7 @@ extern void arp_ifscrub(struct ifnet *ifp, uint32_t addr);
* otherwise.
*/
static int
in_scrubprefix(struct in_ifaddr *target)
in_scrubprefix(struct in_ifaddr *target, u_int flags)
{
struct in_ifaddr *ia;
struct in_addr prefix, mask, p;
@ -1130,13 +1130,15 @@ in_scrubprefix(struct in_ifaddr *target)
RT_REMREF(ia_ro.ro_rt);
RTFREE_LOCKED(ia_ro.ro_rt);
}
if (freeit)
if (freeit && (flags & LLE_STATIC)) {
error = ifa_del_loopback_route((struct ifaddr *)target,
(struct sockaddr *)&target->ia_addr);
if (error == 0)
target->ia_flags &= ~IFA_RTSELF;
/* remove arp cache */
arp_ifscrub(target->ia_ifp, IA_SIN(target)->sin_addr.s_addr);
if (error == 0)
target->ia_flags &= ~IFA_RTSELF;
}
if (flags & LLE_STATIC)
/* remove arp cache */
arp_ifscrub(target->ia_ifp, IA_SIN(target)->sin_addr.s_addr);
}
if (rtinitflags(target))
@ -1203,7 +1205,7 @@ in_scrubprefix(struct in_ifaddr *target)
mask0.sin_family = AF_INET;
mask0.sin_addr.s_addr = target->ia_subnetmask;
lltable_prefix_free(AF_INET, (struct sockaddr *)&prefix0,
(struct sockaddr *)&mask0);
(struct sockaddr *)&mask0, flags);
/*
* As no-one seem to have this prefix, we can remove the route.
@ -1362,7 +1364,8 @@ in_lltable_free(struct lltable *llt, struct llentry *lle)
static void
in_lltable_prefix_free(struct lltable *llt,
const struct sockaddr *prefix,
const struct sockaddr *mask)
const struct sockaddr *mask,
u_int flags)
{
const struct sockaddr_in *pfx = (const struct sockaddr_in *)prefix;
const struct sockaddr_in *msk = (const struct sockaddr_in *)mask;
@ -1373,8 +1376,13 @@ in_lltable_prefix_free(struct lltable *llt,
for (i=0; i < LLTBL_HASHTBL_SIZE; i++) {
LIST_FOREACH_SAFE(lle, &llt->lle_head[i], lle_next, next) {
/*
* (flags & LLE_STATIC) means deleting all entries
* including static ARP entries
*/
if (IN_ARE_MASKED_ADDR_EQUAL((struct sockaddr_in *)L3_ADDR(lle),
pfx, msk)) {
pfx, msk) &&
((flags & LLE_STATIC) || !(lle->la_flags & LLE_STATIC))) {
int canceled;
canceled = callout_drain(&lle->la_timer);

2
sys/netinet/in_var.h
View File

@ -447,7 +447,7 @@ int in_control(struct socket *, u_long, caddr_t, struct ifnet *,
void in_rtqdrain(void);
void ip_input(struct mbuf *);
int in_ifadown(struct ifaddr *ifa, int);
void in_ifscrub(struct ifnet *, struct in_ifaddr *);
void in_ifscrub(struct ifnet *, struct in_ifaddr *, u_int);
struct mbuf *ip_fastforward(struct mbuf *);
void *in_domifattach(struct ifnet *);
void in_domifdetach(struct ifnet *, void *);

9
sys/netinet/raw_ip.c
View File

@ -64,6 +64,7 @@ __FBSDID("$FreeBSD$");
#include <netinet/in_systm.h>
#include <netinet/in_pcb.h>
#include <netinet/in_var.h>
#include <netinet/if_ether.h>
#include <netinet/ip.h>
#include <netinet/ip_var.h>
#include <netinet/ip_mroute.h>
@ -721,7 +722,7 @@ rip_ctlinput(int cmd, struct sockaddr *sa, void *vip)
/*
* in_ifscrub kills the interface route.
*/
in_ifscrub(ia->ia_ifp, ia);
in_ifscrub(ia->ia_ifp, ia, 0);
/*
* in_ifadown gets rid of all the rest of the
* routes. This is not quite the right thing
@ -756,12 +757,18 @@ rip_ctlinput(int cmd, struct sockaddr *sa, void *vip)
|| (ifp->if_flags & IFF_POINTOPOINT))
flags |= RTF_HOST;
err = ifa_del_loopback_route((struct ifaddr *)ia, sa);
if (err == 0)
ia->ia_flags &= ~IFA_RTSELF;
err = rtinit(&ia->ia_ifa, RTM_ADD, flags);
if (err == 0)
ia->ia_flags |= IFA_ROUTE;
err = ifa_add_loopback_route((struct ifaddr *)ia, sa);
if (err == 0)
ia->ia_flags |= IFA_RTSELF;
ifa_free(&ia->ia_ifa);
break;
}

10
sys/netinet6/in6.c
View File

@ -2376,19 +2376,25 @@ in6_lltable_free(struct lltable *llt, struct llentry *lle)
static void
in6_lltable_prefix_free(struct lltable *llt,
const struct sockaddr *prefix,
const struct sockaddr *mask)
const struct sockaddr *mask,
u_int flags)
{
const struct sockaddr_in6 *pfx = (const struct sockaddr_in6 *)prefix;
const struct sockaddr_in6 *msk = (const struct sockaddr_in6 *)mask;
struct llentry *lle, *next;
register int i;
/*
* (flags & LLE_STATIC) means deleting all entries
* including static ND6 entries
*/
for (i=0; i < LLTBL_HASHTBL_SIZE; i++) {
LIST_FOREACH_SAFE(lle, &llt->lle_head[i], lle_next, next) {
if (IN6_ARE_MASKED_ADDR_EQUAL(
&((struct sockaddr_in6 *)L3_ADDR(lle))->sin6_addr,
&pfx->sin6_addr,
&msk->sin6_addr)) {
&msk->sin6_addr) &&
((flags & LLE_STATIC) || !(lle->la_flags & LLE_STATIC))) {
int canceled;
canceled = callout_drain(&lle->la_timer);