2005-04-16 22:20:36 +00:00
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/*
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*
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* Generic internet FLOW.
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*
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*/
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#ifndef _NET_FLOW_H
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#define _NET_FLOW_H
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#include <linux/in6.h>
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#include <asm/atomic.h>
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struct flowi {
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int oif;
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int iif;
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2006-11-09 23:20:38 +00:00
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__u32 mark;
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2011-03-11 20:55:37 +00:00
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__u8 tos;
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__u8 scope;
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__u8 proto;
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__u8 flags;
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#define FLOWI_FLAG_ANYSRC 0x01
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#define FLOWI_FLAG_PRECOW_METRICS 0x02
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#define FLOWI_FLAG_CAN_SLEEP 0x04
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__u32 secid;
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2005-04-16 22:20:36 +00:00
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union {
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struct {
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2006-09-27 04:26:42 +00:00
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__be32 daddr;
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__be32 saddr;
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2005-04-16 22:20:36 +00:00
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} ip4_u;
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struct {
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struct in6_addr daddr;
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struct in6_addr saddr;
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2006-11-08 08:25:17 +00:00
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__be32 flowlabel;
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2005-04-16 22:20:36 +00:00
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} ip6_u;
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struct {
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2006-03-21 06:42:39 +00:00
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__le16 daddr;
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__le16 saddr;
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2005-04-16 22:20:36 +00:00
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__u8 scope;
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} dn_u;
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} nl_u;
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#define fld_dst nl_u.dn_u.daddr
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#define fld_src nl_u.dn_u.saddr
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#define fld_scope nl_u.dn_u.scope
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#define fl6_dst nl_u.ip6_u.daddr
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#define fl6_src nl_u.ip6_u.saddr
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#define fl6_flowlabel nl_u.ip6_u.flowlabel
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#define fl4_dst nl_u.ip4_u.daddr
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#define fl4_src nl_u.ip4_u.saddr
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2011-03-11 20:55:37 +00:00
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#define fl4_tos tos
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#define fl4_scope scope
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2005-04-16 22:20:36 +00:00
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union {
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struct {
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2006-09-28 01:33:22 +00:00
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__be16 sport;
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__be16 dport;
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2005-04-16 22:20:36 +00:00
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} ports;
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struct {
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__u8 type;
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__u8 code;
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} icmpt;
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struct {
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2006-03-21 06:42:39 +00:00
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__le16 sport;
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__le16 dport;
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2005-04-16 22:20:36 +00:00
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} dnports;
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2006-09-28 01:49:07 +00:00
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__be32 spi;
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2010-11-03 04:41:38 +00:00
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__be32 gre_key;
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2006-08-24 03:34:26 +00:00
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struct {
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__u8 type;
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} mht;
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2005-04-16 22:20:36 +00:00
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} uli_u;
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#define fl_ip_sport uli_u.ports.sport
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#define fl_ip_dport uli_u.ports.dport
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#define fl_icmp_type uli_u.icmpt.type
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#define fl_icmp_code uli_u.icmpt.code
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#define fl_ipsec_spi uli_u.spi
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2006-08-24 03:34:26 +00:00
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#define fl_mh_type uli_u.mht.type
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2010-11-03 04:41:38 +00:00
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#define fl_gre_key uli_u.gre_key
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2005-04-16 22:20:36 +00:00
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} __attribute__((__aligned__(BITS_PER_LONG/8)));
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#define FLOW_DIR_IN 0
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#define FLOW_DIR_OUT 1
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#define FLOW_DIR_FWD 2
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2008-11-26 01:35:18 +00:00
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struct net;
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[LSM-IPSec]: Security association restriction.
This patch series implements per packet access control via the
extension of the Linux Security Modules (LSM) interface by hooks in
the XFRM and pfkey subsystems that leverage IPSec security
associations to label packets. Extensions to the SELinux LSM are
included that leverage the patch for this purpose.
This patch implements the changes necessary to the XFRM subsystem,
pfkey interface, ipv4/ipv6, and xfrm_user interface to restrict a
socket to use only authorized security associations (or no security
association) to send/receive network packets.
Patch purpose:
The patch is designed to enable access control per packets based on
the strongly authenticated IPSec security association. Such access
controls augment the existing ones based on network interface and IP
address. The former are very coarse-grained, and the latter can be
spoofed. By using IPSec, the system can control access to remote
hosts based on cryptographic keys generated using the IPSec mechanism.
This enables access control on a per-machine basis or per-application
if the remote machine is running the same mechanism and trusted to
enforce the access control policy.
Patch design approach:
The overall approach is that policy (xfrm_policy) entries set by
user-level programs (e.g., setkey for ipsec-tools) are extended with a
security context that is used at policy selection time in the XFRM
subsystem to restrict the sockets that can send/receive packets via
security associations (xfrm_states) that are built from those
policies.
A presentation available at
www.selinux-symposium.org/2005/presentations/session2/2-3-jaeger.pdf
from the SELinux symposium describes the overall approach.
Patch implementation details:
On output, the policy retrieved (via xfrm_policy_lookup or
xfrm_sk_policy_lookup) must be authorized for the security context of
the socket and the same security context is required for resultant
security association (retrieved or negotiated via racoon in
ipsec-tools). This is enforced in xfrm_state_find.
On input, the policy retrieved must also be authorized for the socket
(at __xfrm_policy_check), and the security context of the policy must
also match the security association being used.
The patch has virtually no impact on packets that do not use IPSec.
The existing Netfilter (outgoing) and LSM rcv_skb hooks are used as
before.
Also, if IPSec is used without security contexts, the impact is
minimal. The LSM must allow such policies to be selected for the
combination of socket and remote machine, but subsequent IPSec
processing proceeds as in the original case.
Testing:
The pfkey interface is tested using the ipsec-tools. ipsec-tools have
been modified (a separate ipsec-tools patch is available for version
0.5) that supports assignment of xfrm_policy entries and security
associations with security contexts via setkey and the negotiation
using the security contexts via racoon.
The xfrm_user interface is tested via ad hoc programs that set
security contexts. These programs are also available from me, and
contain programs for setting, getting, and deleting policy for testing
this interface. Testing of sa functions was done by tracing kernel
behavior.
Signed-off-by: Trent Jaeger <tjaeger@cse.psu.edu>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-12-14 07:12:27 +00:00
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struct sock;
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2010-04-07 00:30:04 +00:00
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struct flow_cache_ops;
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struct flow_cache_object {
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const struct flow_cache_ops *ops;
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};
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struct flow_cache_ops {
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struct flow_cache_object *(*get)(struct flow_cache_object *);
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int (*check)(struct flow_cache_object *);
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void (*delete)(struct flow_cache_object *);
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};
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typedef struct flow_cache_object *(*flow_resolve_t)(
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2011-02-23 02:44:31 +00:00
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struct net *net, const struct flowi *key, u16 family,
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2010-04-07 00:30:04 +00:00
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u8 dir, struct flow_cache_object *oldobj, void *ctx);
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extern struct flow_cache_object *flow_cache_lookup(
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2011-02-23 02:44:31 +00:00
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struct net *net, const struct flowi *key, u16 family,
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2010-04-07 00:30:04 +00:00
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u8 dir, flow_resolve_t resolver, void *ctx);
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2005-04-16 22:20:36 +00:00
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extern void flow_cache_flush(void);
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extern atomic_t flow_cache_genid;
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2011-02-23 02:27:22 +00:00
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static inline int flow_cache_uli_match(const struct flowi *fl1,
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const struct flowi *fl2)
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2007-04-30 07:33:35 +00:00
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{
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return (fl1->proto == fl2->proto &&
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!memcmp(&fl1->uli_u, &fl2->uli_u, sizeof(fl1->uli_u)));
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}
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2005-04-16 22:20:36 +00:00
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#endif
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