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Add sysctls to toggle the behaviour of the (former) IPSEC_FILTERTUNNEL

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kernel option.
This also permits tuning of the option per virtual network stack, as
well as separately per inet, inet6.

The kernel option is left for a transition period, marked deprecated,
and will be removed soon.

Initially requested by:	phk (1 year 1 day ago)
MFC after:		4 weeks
This commit is contained in:
Bjoern A. Zeeb 2009-05-23 16:42:38 +00:00
parent b44522f44b
commit db2e47925e
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=192648
8 changed files with 51 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
share/man/man4/ipsec.4
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@ -29,7 +29,7 @@
.\"
.\" $FreeBSD$
.\"
.Dd August 5, 2007
.Dd May 23, 2009
.Dt IPSEC 4
.Os
.Sh NAME
@ -37,7 +37,6 @@
.Nd Internet Protocol Security protocol
.Sh SYNOPSIS
.Cd "options IPSEC"
.Cd "options IPSEC_FILTERTUNNEL"
.Cd "device crypto"
.Pp
.In sys/types.h
@ -88,9 +87,12 @@ inbound.
.Pp
To properly filter on the inner packets of an
.Nm
tunnel with firewalls, add
.Cd "options IPSEC_FILTERTUNNEL"
to the kernel configuration file.
tunnel with firewalls, you can change the values of the following sysctls
.Bl -column net.inet6.ipsec6.filtertunnel default enable
.It Sy "Name Default Enable"
.It net.inet.ipsec.filtertunnel 0 1
.It net.inet6.ipsec6.filtertunnel 0 1
.El
.\"
.Ss Kernel interface
.Nm

7
sys/conf/NOTES
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@ -524,9 +524,10 @@ options ROUTETABLES=2 # max 16. 1 is back compatible.
options IPSEC #IP security (requires device crypto)
#options IPSEC_DEBUG #debug for IP security
#
# Set IPSEC_FILTERTUNNEL to force packets coming through a tunnel
# to be processed by any configured packet filtering twice.
# The default is that packets coming out of a tunnel are _not_ processed;
# #DEPRECATED#
# Set IPSEC_FILTERTUNNEL to change the default of the sysctl to force packets
# coming through a tunnel to be processed by any configured packet filtering
# twice. The default is that packets coming out of a tunnel are _not_ processed;
# they are assumed trusted.
#
# IPSEC history is preserved for such packets, and can be filtered

11
sys/netinet/ip_ipsec.c
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@ -71,6 +71,10 @@ __FBSDID("$FreeBSD$");
extern struct protosw inetsw[];
#ifdef VIMAGE_GLOBALS
int ip4_ipsec_filtertunnel;
#endif
/*
* Check if we have to jump over firewall processing for this packet.
* Called from ip_input().
@ -79,11 +83,14 @@ extern struct protosw inetsw[];
int
ip_ipsec_filtertunnel(struct mbuf *m)
{
#if defined(IPSEC) && !defined(IPSEC_FILTERTUNNEL)
#if defined(IPSEC)
INIT_VNET_IPSEC(curvnet);
/*
* Bypass packet filtering for packets from a tunnel.
*/
if (m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL) != NULL)
if (!V_ip4_ipsec_filtertunnel &&
m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL) != NULL)
return 1;
#endif
return 0;

11
sys/netinet6/ip6_ipsec.c
View File

@ -76,6 +76,10 @@ __FBSDID("$FreeBSD$");
extern struct protosw inet6sw[];
#ifdef VIMAGE_GLOBALS
int ip6_ipsec6_filtertunnel;
#endif
/*
* Check if we have to jump over firewall processing for this packet.
* Called from ip_input().
@ -84,11 +88,14 @@ extern struct protosw inet6sw[];
int
ip6_ipsec_filtertunnel(struct mbuf *m)
{
#if defined(IPSEC) && !defined(IPSEC_FILTERTUNNEL)
#if defined(IPSEC)
INIT_VNET_IPSEC(curvnet);
/*
* Bypass packet filtering for packets from a tunnel.
*/
if (m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL) != NULL)
if (!V_ip6_ipsec6_filtertunnel &&
m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL) != NULL)
return 1;
#endif
return 0;

16
sys/netipsec/ipsec.c
View File

@ -167,6 +167,9 @@ SYSCTL_V_INT(V_NET, vnet_ipsec, _net_inet_ipsec, OID_AUTO,
SYSCTL_V_STRUCT(V_NET, vnet_ipsec, _net_inet_ipsec, OID_AUTO,
ipsecstats, CTLFLAG_RD, ipsec4stat, ipsecstat,
"IPsec IPv4 statistics.");
SYSCTL_V_INT(V_NET, vnet_ipsec, _net_inet_ipsec, OID_AUTO,
filtertunnel, CTLFLAG_RW, ip4_ipsec_filtertunnel, 0,
"If set filter packets from an IPsec tunnel.");
#ifdef REGRESSION
#ifdef VIMAGE_GLOBALS
@ -228,6 +231,9 @@ SYSCTL_V_INT(V_NET, vnet_ipsec, _net_inet6_ipsec6, IPSECCTL_DEBUG,
SYSCTL_V_STRUCT(V_NET, vnet_ipsec, _net_inet6_ipsec6, IPSECCTL_STATS,
ipsecstats, CTLFLAG_RD, ipsec6stat, ipsecstat,
"IPsec IPv6 statistics.");
SYSCTL_V_INT(V_NET, vnet_ipsec, _net_inet6_ipsec6, OID_AUTO,
filtertunnel, CTLFLAG_RW, ip6_ipsec6_filtertunnel, 0,
"If set filter packets from an IPsec tunnel.");
#endif /* INET6 */
static int ipsec_setspidx_inpcb __P((struct mbuf *, struct inpcb *));
@ -273,6 +279,11 @@ ipsec_init(void)
V_ip4_ah_net_deflev = IPSEC_LEVEL_USE;
V_ip4_ipsec_ecn = 0; /* ECN ignore(-1)/forbidden(0)/allowed(1) */
V_ip4_esp_randpad = -1;
#ifdef IPSEC_FILTERTUNNEL
V_ip4_ipsec_filtertunnel = 1;
#else
V_ip4_ipsec_filtertunnel = 0;
#endif
V_crypto_support = CRYPTOCAP_F_HARDWARE | CRYPTOCAP_F_SOFTWARE;
@ -287,6 +298,11 @@ ipsec_init(void)
V_ip6_ah_trans_deflev = IPSEC_LEVEL_USE;
V_ip6_ah_net_deflev = IPSEC_LEVEL_USE;
V_ip6_ipsec_ecn = 0; /* ECN ignore(-1)/forbidden(0)/allowed(1) */
#ifdef IPSEC_FILTERTUNNEL
V_ip6_ipsec6_filtertunnel = 1;
#else
V_ip6_ipsec6_filtertunnel = 0;
#endif
#endif
}

1
sys/netipsec/ipsec.h
View File

@ -348,6 +348,7 @@ extern int ip4_ah_cleartos;
extern int ip4_ah_offsetmask;
extern int ip4_ipsec_dfbit;
extern int ip4_ipsec_ecn;
extern int ip4_ipsec_filtertunnel;
extern int ip4_esp_randpad;
extern int crypto_support;

1
sys/netipsec/ipsec6.h
View File

@ -47,6 +47,7 @@ extern int ip6_esp_net_deflev;
extern int ip6_ah_trans_deflev;
extern int ip6_ah_net_deflev;
extern int ip6_ipsec_ecn;
extern int ip6_ipsec6_filtertunnel;
struct inpcb;

4
sys/netipsec/vipsec.h
View File

@ -57,6 +57,7 @@ struct vnet_ipsec {
int _ip4_ah_offsetmask;
int _ip4_ipsec_dfbit;
int _ip4_ipsec_ecn;
int _ip4_ipsec_filtertunnel;
int _ip4_esp_randpad;
int _ipsec_replay;
@ -90,6 +91,7 @@ struct vnet_ipsec {
int _ip6_ah_trans_deflev;
int _ip6_ah_net_deflev;
int _ip6_ipsec_ecn;
int _ip6_ipsec6_filtertunnel;
int _ah_enable;
int _ah_cleartos;
@ -142,12 +144,14 @@ extern struct vnet_ipsec vnet_ipsec_0;
#define V_ip4_esp_trans_deflev VNET_IPSEC(ip4_esp_trans_deflev)
#define V_ip4_ipsec_dfbit VNET_IPSEC(ip4_ipsec_dfbit)
#define V_ip4_ipsec_ecn VNET_IPSEC(ip4_ipsec_ecn)
#define V_ip4_ipsec_filtertunnel VNET_IPSEC(ip4_ipsec_filtertunnel)
#define V_ip6_ah_net_deflev VNET_IPSEC(ip6_ah_net_deflev)
#define V_ip6_ah_trans_deflev VNET_IPSEC(ip6_ah_trans_deflev)
#define V_ip6_esp_net_deflev VNET_IPSEC(ip6_esp_net_deflev)
#define V_ip6_esp_randpad VNET_IPSEC(ip6_esp_randpad)
#define V_ip6_esp_trans_deflev VNET_IPSEC(ip6_esp_trans_deflev)
#define V_ip6_ipsec_ecn VNET_IPSEC(ip6_ipsec_ecn)
#define V_ip6_ipsec6_filtertunnel VNET_IPSEC(ip6_ipsec6_filtertunnel)
#define V_ipcomp_enable VNET_IPSEC(ipcomp_enable)
#define V_ipcompstat VNET_IPSEC(ipcompstat)
#define V_ipip_allow VNET_IPSEC(ipip_allow)