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Code

Unlock unlock ipip_sysctl().

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- IPIPCTL_ALLOW - atomically accessed integer;
- IPIPCTL_STATS - per-CPU counters;

In ipip_input() load `ipip_allow' value to `ipip_allow_local' and pass
it down to ipip_input_if() as `allow' arg.

ok bluhm
This commit is contained in:
mvs 2024-08-22 10:58:31 +00:00
parent f9d2544ecb
commit 7af0f08f59
3 changed files with 18 additions and 17 deletions
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4
sys/netinet/in_proto.c
View File

@ -1,4 +1,4 @@
/* $OpenBSD: in_proto.c,v 1.112 2024/08/21 12:53:36 mvs Exp $ */
/* $OpenBSD: in_proto.c,v 1.113 2024/08/22 10:58:31 mvs Exp $ */
/* $NetBSD: in_proto.c,v 1.14 1996/02/18 18:58:32 christos Exp $ */
/*
@ -230,7 +230,7 @@ const struct protosw inetsw[] = {
.pr_type = SOCK_RAW,
.pr_domain = &inetdomain,
.pr_protocol = IPPROTO_IPV4,
.pr_flags = PR_ATOMIC|PR_ADDR|PR_MPSOCKET,
.pr_flags = PR_ATOMIC|PR_ADDR|PR_MPSOCKET|PR_MPSYSCTL,
#if NGIF > 0
.pr_input = in_gif_input,
#else

27
sys/netinet/ip_ipip.c
View File

@ -1,4 +1,4 @@
/* $OpenBSD: ip_ipip.c,v 1.104 2024/08/21 12:53:36 mvs Exp $ */
/* $OpenBSD: ip_ipip.c,v 1.105 2024/08/22 10:58:31 mvs Exp $ */
/*
* The authors of this code are John Ioannidis (ji@tla.org),
* Angelos D. Keromytis (kermit@csd.uch.gr) and
@ -72,6 +72,11 @@
#include <net/pfvar.h>
#endif
/*
* Locks used to protect data:
* a atomic
*/
#ifdef ENCDEBUG
#define DPRINTF(fmt, args...) \
do { \
@ -87,7 +92,7 @@
* We can control the acceptance of IP4 packets by altering the sysctl
* net.inet.ipip.allow value. Zero means drop them, all else is acceptance.
*/
int ipip_allow = 0;
int ipip_allow = 0; /* [a] */
struct cpumem *ipipcounters;
@ -104,9 +109,10 @@ int
ipip_input(struct mbuf **mp, int *offp, int nxt, int af)
{
struct ifnet *ifp;
int ipip_allow_local = atomic_load_int(&ipip_allow);
/* If we do not accept IP-in-IP explicitly, drop. */
if (!ipip_allow && ((*mp)->m_flags & (M_AUTH|M_CONF)) == 0) {
if (ipip_allow_local == 0 && ((*mp)->m_flags & (M_AUTH|M_CONF)) == 0) {
DPRINTF("dropped due to policy");
ipipstat_inc(ipips_pdrops);
m_freemp(mp);
@ -118,7 +124,7 @@ ipip_input(struct mbuf **mp, int *offp, int nxt, int af)
m_freemp(mp);
return IPPROTO_DONE;
}
nxt = ipip_input_if(mp, offp, nxt, af, ifp);
nxt = ipip_input_if(mp, offp, nxt, af, ipip_allow_local, ifp);
if_put(ifp);
return nxt;
@ -133,7 +139,7 @@ ipip_input(struct mbuf **mp, int *offp, int nxt, int af)
*/
int
ipip_input_if(struct mbuf **mp, int *offp, int proto, int oaf,
ipip_input_if(struct mbuf **mp, int *offp, int proto, int oaf, int allow,
struct ifnet *ifp)
{
struct mbuf *m = *mp;
@ -271,7 +277,7 @@ ipip_input_if(struct mbuf **mp, int *offp, int proto, int oaf,
}
/* Check for local address spoofing. */
if (!(ifp->if_flags & IFF_LOOPBACK) && ipip_allow != 2) {
if (!(ifp->if_flags & IFF_LOOPBACK) && allow != 2) {
struct sockaddr_storage ss;
struct rtentry *rt;
@ -584,19 +590,14 @@ int
ipip_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp, void *newp,
size_t newlen)
{
int error;
/* All sysctl names at this level are terminal. */
if (namelen != 1)
return (ENOTDIR);
switch (name[0]) {
case IPIPCTL_ALLOW:
NET_LOCK();
error = sysctl_int_bounded(oldp, oldlenp, newp, newlen,
&ipip_allow, 0, 2);
NET_UNLOCK();
return (error);
return (sysctl_int_bounded(oldp, oldlenp, newp, newlen,
&ipip_allow, 0, 2));
case IPIPCTL_STATS:
return (ipip_sysctl_ipipstat(oldp, oldlenp, newp));
default:

4
sys/netinet/ip_ipip.h
View File

@ -1,4 +1,4 @@
/* $OpenBSD: ip_ipip.h,v 1.13 2021/10/13 14:36:31 bluhm Exp $ */
/* $OpenBSD: ip_ipip.h,v 1.14 2024/08/22 10:58:31 mvs Exp $ */
/*
* The authors of this code are John Ioannidis (ji@tla.org),
* Angelos D. Keromytis (kermit@csd.uch.gr) and
@ -114,7 +114,7 @@ struct tdb;
void ipip_init(void);
int ipip_input(struct mbuf **, int *, int, int);
int ipip_input_if(struct mbuf **, int *, int, int, struct ifnet *);
int ipip_input_if(struct mbuf **, int *, int, int, int, struct ifnet *);
int ipip_output(struct mbuf **, struct tdb *);
int ipip_sysctl(int *, u_int, void *, size_t *, void *, size_t);