2005-04-17 06:20:36 +08:00
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/*
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* xfrm6_policy.c: based on xfrm4_policy.c
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*
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* Authors:
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* Mitsuru KANDA @USAGI
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* Kazunori MIYAZAWA @USAGI
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* Kunihiro Ishiguro <kunihiro@ipinfusion.com>
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* IPv6 support
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* YOSHIFUJI Hideaki
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* Split up af-specific portion
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2007-02-09 22:24:49 +08:00
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*
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2005-04-17 06:20:36 +08:00
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*/
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2005-05-04 07:27:10 +08:00
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#include <linux/compiler.h>
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#include <linux/netdevice.h>
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#include <net/addrconf.h>
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2005-04-17 06:20:36 +08:00
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#include <net/xfrm.h>
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#include <net/ip.h>
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#include <net/ipv6.h>
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#include <net/ip6_route.h>
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2007-06-27 14:56:32 +08:00
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#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
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2006-08-24 11:39:03 +08:00
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#include <net/mip6.h>
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#endif
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2005-04-17 06:20:36 +08:00
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static struct dst_ops xfrm6_dst_ops;
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static struct xfrm_policy_afinfo xfrm6_policy_afinfo;
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2006-10-17 13:10:05 +08:00
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static int xfrm6_dst_lookup(struct xfrm_dst **xdst, struct flowi *fl)
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2005-04-17 06:20:36 +08:00
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{
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2006-10-17 13:10:05 +08:00
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struct dst_entry *dst = ip6_route_output(NULL, fl);
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int err = dst->error;
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if (!err)
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*xdst = (struct xfrm_dst *) dst;
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else
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dst_release(dst);
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2005-04-17 06:20:36 +08:00
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return err;
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}
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2006-09-20 03:57:34 +08:00
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static int xfrm6_get_saddr(xfrm_address_t *saddr, xfrm_address_t *daddr)
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{
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struct rt6_info *rt;
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struct flowi fl_tunnel = {
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.nl_u = {
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.ip6_u = {
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.daddr = *(struct in6_addr *)&daddr->a6,
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},
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},
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};
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if (!xfrm6_dst_lookup((struct xfrm_dst **)&rt, &fl_tunnel)) {
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ipv6_get_saddr(&rt->u.dst, (struct in6_addr *)&daddr->a6,
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(struct in6_addr *)&saddr->a6);
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dst_release(&rt->u.dst);
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return 0;
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}
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return -EHOSTUNREACH;
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}
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2005-04-17 06:20:36 +08:00
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static struct dst_entry *
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__xfrm6_find_bundle(struct flowi *fl, struct xfrm_policy *policy)
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{
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struct dst_entry *dst;
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/* Still not clear if we should set fl->fl6_{src,dst}... */
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read_lock_bh(&policy->lock);
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for (dst = policy->bundles; dst; dst = dst->next) {
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struct xfrm_dst *xdst = (struct xfrm_dst*)dst;
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struct in6_addr fl_dst_prefix, fl_src_prefix;
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ipv6_addr_prefix(&fl_dst_prefix,
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&fl->fl6_dst,
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xdst->u.rt6.rt6i_dst.plen);
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ipv6_addr_prefix(&fl_src_prefix,
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&fl->fl6_src,
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xdst->u.rt6.rt6i_src.plen);
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if (ipv6_addr_equal(&xdst->u.rt6.rt6i_dst.addr, &fl_dst_prefix) &&
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ipv6_addr_equal(&xdst->u.rt6.rt6i_src.addr, &fl_src_prefix) &&
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IPsec: correct semantics for SELinux policy matching
Currently when an IPSec policy rule doesn't specify a security
context, it is assumed to be "unlabeled" by SELinux, and so
the IPSec policy rule fails to match to a flow that it would
otherwise match to, unless one has explicitly added an SELinux
policy rule allowing the flow to "polmatch" to the "unlabeled"
IPSec policy rules. In the absence of such an explicitly added
SELinux policy rule, the IPSec policy rule fails to match and
so the packet(s) flow in clear text without the otherwise applicable
xfrm(s) applied.
The above SELinux behavior violates the SELinux security notion of
"deny by default" which should actually translate to "encrypt by
default" in the above case.
This was first reported by Evgeniy Polyakov and the way James Morris
was seeing the problem was when connecting via IPsec to a
confined service on an SELinux box (vsftpd), which did not have the
appropriate SELinux policy permissions to send packets via IPsec.
With this patch applied, SELinux "polmatching" of flows Vs. IPSec
policy rules will only come into play when there's a explicit context
specified for the IPSec policy rule (which also means there's corresponding
SELinux policy allowing appropriate domains/flows to polmatch to this context).
Secondly, when a security module is loaded (in this case, SELinux), the
security_xfrm_policy_lookup() hook can return errors other than access denied,
such as -EINVAL. We were not handling that correctly, and in fact
inverting the return logic and propagating a false "ok" back up to
xfrm_lookup(), which then allowed packets to pass as if they were not
associated with an xfrm policy.
The solution for this is to first ensure that errno values are
correctly propagated all the way back up through the various call chains
from security_xfrm_policy_lookup(), and handled correctly.
Then, flow_cache_lookup() is modified, so that if the policy resolver
fails (typically a permission denied via the security module), the flow
cache entry is killed rather than having a null policy assigned (which
indicates that the packet can pass freely). This also forces any future
lookups for the same flow to consult the security module (e.g. SELinux)
for current security policy (rather than, say, caching the error on the
flow cache entry).
This patch: Fix the selinux side of things.
This makes sure SELinux polmatching of flow contexts to IPSec policy
rules comes into play only when an explicit context is associated
with the IPSec policy rule.
Also, this no longer defaults the context of a socket policy to
the context of the socket since the "no explicit context" case
is now handled properly.
Signed-off-by: Venkat Yekkirala <vyekkirala@TrustedCS.com>
Signed-off-by: James Morris <jmorris@namei.org>
2006-10-06 04:42:18 +08:00
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xfrm_bundle_ok(policy, xdst, fl, AF_INET6,
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2006-08-24 10:12:01 +08:00
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(xdst->u.rt6.rt6i_dst.plen != 128 ||
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xdst->u.rt6.rt6i_src.plen != 128))) {
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2005-04-17 06:20:36 +08:00
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dst_clone(dst);
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break;
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}
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}
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read_unlock_bh(&policy->lock);
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return dst;
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}
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2006-08-24 09:10:33 +08:00
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static inline struct in6_addr*
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__xfrm6_bundle_addr_remote(struct xfrm_state *x, struct in6_addr *addr)
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{
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return (x->type->remote_addr) ?
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(struct in6_addr*)x->type->remote_addr(x, (xfrm_address_t *)addr) :
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(struct in6_addr*)&x->id.daddr;
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}
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static inline struct in6_addr*
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__xfrm6_bundle_addr_local(struct xfrm_state *x, struct in6_addr *addr)
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{
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return (x->type->local_addr) ?
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(struct in6_addr*)x->type->local_addr(x, (xfrm_address_t *)addr) :
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(struct in6_addr*)&x->props.saddr;
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}
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2006-08-24 09:11:50 +08:00
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static inline void
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__xfrm6_bundle_len_inc(int *len, int *nflen, struct xfrm_state *x)
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{
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if (x->type->flags & XFRM_TYPE_NON_FRAGMENT)
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*nflen += x->props.header_len;
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else
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*len += x->props.header_len;
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}
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static inline void
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__xfrm6_bundle_len_dec(int *len, int *nflen, struct xfrm_state *x)
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{
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if (x->type->flags & XFRM_TYPE_NON_FRAGMENT)
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*nflen -= x->props.header_len;
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else
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*len -= x->props.header_len;
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}
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2005-04-17 06:20:36 +08:00
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/* Allocate chain of dst_entry's, attach known xfrm's, calculate
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* all the metrics... Shortly, bundle a bundle.
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*/
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static int
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__xfrm6_bundle_create(struct xfrm_policy *policy, struct xfrm_state **xfrm, int nx,
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struct flowi *fl, struct dst_entry **dst_p)
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{
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struct dst_entry *dst, *dst_prev;
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struct rt6_info *rt0 = (struct rt6_info*)(*dst_p);
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struct rt6_info *rt = rt0;
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struct flowi fl_tunnel = {
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.nl_u = {
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.ip6_u = {
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2007-02-07 06:27:02 +08:00
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.saddr = fl->fl6_src,
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.daddr = fl->fl6_dst,
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2005-04-17 06:20:36 +08:00
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}
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}
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};
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int i;
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int err = 0;
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int header_len = 0;
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2006-08-24 09:11:50 +08:00
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int nfheader_len = 0;
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2005-04-17 06:20:36 +08:00
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int trailer_len = 0;
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dst = dst_prev = NULL;
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dst_hold(&rt->u.dst);
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for (i = 0; i < nx; i++) {
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struct dst_entry *dst1 = dst_alloc(&xfrm6_dst_ops);
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struct xfrm_dst *xdst;
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if (unlikely(dst1 == NULL)) {
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err = -ENOBUFS;
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dst_release(&rt->u.dst);
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goto error;
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}
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if (!dst)
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dst = dst1;
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else {
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dst_prev->child = dst1;
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dst1->flags |= DST_NOHASH;
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dst_clone(dst1);
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}
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xdst = (struct xfrm_dst *)dst1;
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xdst->route = &rt->u.dst;
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2006-08-24 18:18:09 +08:00
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xdst->genid = xfrm[i]->genid;
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2005-05-27 03:58:04 +08:00
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if (rt->rt6i_node)
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xdst->route_cookie = rt->rt6i_node->fn_sernum;
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2005-04-17 06:20:36 +08:00
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dst1->next = dst_prev;
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dst_prev = dst1;
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2007-02-07 06:27:02 +08:00
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2006-08-24 09:11:50 +08:00
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__xfrm6_bundle_len_inc(&header_len, &nfheader_len, xfrm[i]);
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2005-04-17 06:20:36 +08:00
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trailer_len += xfrm[i]->props.trailer_len;
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2007-10-18 12:31:50 +08:00
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if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) {
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2007-02-07 06:27:02 +08:00
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unsigned short encap_family = xfrm[i]->props.family;
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switch(encap_family) {
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case AF_INET:
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fl_tunnel.fl4_dst = xfrm[i]->id.daddr.a4;
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fl_tunnel.fl4_src = xfrm[i]->props.saddr.a4;
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break;
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case AF_INET6:
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2007-02-10 13:22:16 +08:00
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ipv6_addr_copy(&fl_tunnel.fl6_dst, __xfrm6_bundle_addr_remote(xfrm[i], &fl->fl6_dst));
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2007-02-20 17:08:41 +08:00
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ipv6_addr_copy(&fl_tunnel.fl6_src, __xfrm6_bundle_addr_local(xfrm[i], &fl->fl6_src));
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2007-02-07 06:27:02 +08:00
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break;
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default:
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BUG_ON(1);
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}
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2005-04-17 06:20:36 +08:00
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err = xfrm_dst_lookup((struct xfrm_dst **) &rt,
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2007-02-07 06:27:02 +08:00
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&fl_tunnel, encap_family);
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2005-04-17 06:20:36 +08:00
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if (err)
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goto error;
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} else
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dst_hold(&rt->u.dst);
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}
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dst_prev->child = &rt->u.dst;
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dst->path = &rt->u.dst;
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2005-05-27 03:58:04 +08:00
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if (rt->rt6i_node)
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((struct xfrm_dst *)dst)->path_cookie = rt->rt6i_node->fn_sernum;
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2005-04-17 06:20:36 +08:00
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*dst_p = dst;
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dst = dst_prev;
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dst_prev = *dst_p;
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i = 0;
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for (; dst_prev != &rt->u.dst; dst_prev = dst_prev->child) {
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struct xfrm_dst *x = (struct xfrm_dst*)dst_prev;
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dst_prev->xfrm = xfrm[i++];
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dst_prev->dev = rt->u.dst.dev;
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if (rt->u.dst.dev)
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dev_hold(rt->u.dst.dev);
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dst_prev->obsolete = -1;
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dst_prev->flags |= DST_HOST;
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dst_prev->lastuse = jiffies;
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dst_prev->header_len = header_len;
|
2006-08-24 09:11:50 +08:00
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dst_prev->nfheader_len = nfheader_len;
|
2005-04-17 06:20:36 +08:00
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dst_prev->trailer_len = trailer_len;
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memcpy(&dst_prev->metrics, &x->route->metrics, sizeof(dst_prev->metrics));
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/* Copy neighbour for reachability confirmation */
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dst_prev->neighbour = neigh_clone(rt->u.dst.neighbour);
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dst_prev->input = rt->u.dst.input;
|
2007-10-18 12:35:51 +08:00
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dst_prev->output = dst_prev->xfrm->outer_mode->afinfo->output;
|
2005-04-17 06:20:36 +08:00
|
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/* Sheit... I remember I did this right. Apparently,
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* it was magically lost, so this code needs audit */
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x->u.rt6.rt6i_flags = rt0->rt6i_flags&(RTCF_BROADCAST|RTCF_MULTICAST|RTCF_LOCAL);
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x->u.rt6.rt6i_metric = rt0->rt6i_metric;
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|
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x->u.rt6.rt6i_node = rt0->rt6i_node;
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|
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x->u.rt6.rt6i_gateway = rt0->rt6i_gateway;
|
2007-02-09 22:24:49 +08:00
|
|
|
memcpy(&x->u.rt6.rt6i_gateway, &rt0->rt6i_gateway, sizeof(x->u.rt6.rt6i_gateway));
|
2005-04-17 06:20:36 +08:00
|
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x->u.rt6.rt6i_dst = rt0->rt6i_dst;
|
2007-02-09 22:24:49 +08:00
|
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x->u.rt6.rt6i_src = rt0->rt6i_src;
|
2005-05-04 07:27:10 +08:00
|
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x->u.rt6.rt6i_idev = rt0->rt6i_idev;
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|
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in6_dev_hold(rt0->rt6i_idev);
|
2006-08-24 09:11:50 +08:00
|
|
|
__xfrm6_bundle_len_dec(&header_len, &nfheader_len, x->u.dst.xfrm);
|
2005-04-17 06:20:36 +08:00
|
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|
trailer_len -= x->u.dst.xfrm->props.trailer_len;
|
|
|
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}
|
|
|
|
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|
|
|
xfrm_init_pmtu(dst);
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|
|
|
return 0;
|
|
|
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|
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|
error:
|
|
|
|
if (dst)
|
|
|
|
dst_free(dst);
|
|
|
|
return err;
|
|
|
|
}
|
|
|
|
|
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|
|
static inline void
|
|
|
|
_decode_session6(struct sk_buff *skb, struct flowi *fl)
|
|
|
|
{
|
2007-03-17 04:26:39 +08:00
|
|
|
u16 offset = skb_network_header_len(skb);
|
2007-04-26 08:54:47 +08:00
|
|
|
struct ipv6hdr *hdr = ipv6_hdr(skb);
|
2006-04-19 05:46:52 +08:00
|
|
|
struct ipv6_opt_hdr *exthdr;
|
2007-04-11 11:50:43 +08:00
|
|
|
const unsigned char *nh = skb_network_header(skb);
|
|
|
|
u8 nexthdr = nh[IP6CB(skb)->nhoff];
|
2005-04-17 06:20:36 +08:00
|
|
|
|
|
|
|
memset(fl, 0, sizeof(struct flowi));
|
|
|
|
ipv6_addr_copy(&fl->fl6_dst, &hdr->daddr);
|
|
|
|
ipv6_addr_copy(&fl->fl6_src, &hdr->saddr);
|
|
|
|
|
2007-04-11 11:50:43 +08:00
|
|
|
while (pskb_may_pull(skb, nh + offset + 1 - skb->data)) {
|
|
|
|
nh = skb_network_header(skb);
|
|
|
|
exthdr = (struct ipv6_opt_hdr *)(nh + offset);
|
2006-04-19 05:46:52 +08:00
|
|
|
|
2005-04-17 06:20:36 +08:00
|
|
|
switch (nexthdr) {
|
|
|
|
case NEXTHDR_ROUTING:
|
|
|
|
case NEXTHDR_HOP:
|
|
|
|
case NEXTHDR_DEST:
|
|
|
|
offset += ipv6_optlen(exthdr);
|
|
|
|
nexthdr = exthdr->nexthdr;
|
2007-04-11 11:50:43 +08:00
|
|
|
exthdr = (struct ipv6_opt_hdr *)(nh + offset);
|
2005-04-17 06:20:36 +08:00
|
|
|
break;
|
|
|
|
|
|
|
|
case IPPROTO_UDP:
|
2006-11-28 03:10:57 +08:00
|
|
|
case IPPROTO_UDPLITE:
|
2005-04-17 06:20:36 +08:00
|
|
|
case IPPROTO_TCP:
|
|
|
|
case IPPROTO_SCTP:
|
2005-12-20 06:03:46 +08:00
|
|
|
case IPPROTO_DCCP:
|
2007-04-11 11:50:43 +08:00
|
|
|
if (pskb_may_pull(skb, nh + offset + 4 - skb->data)) {
|
2006-11-08 16:20:21 +08:00
|
|
|
__be16 *ports = (__be16 *)exthdr;
|
2005-04-17 06:20:36 +08:00
|
|
|
|
|
|
|
fl->fl_ip_sport = ports[0];
|
|
|
|
fl->fl_ip_dport = ports[1];
|
|
|
|
}
|
|
|
|
fl->proto = nexthdr;
|
|
|
|
return;
|
|
|
|
|
|
|
|
case IPPROTO_ICMPV6:
|
2007-04-11 11:50:43 +08:00
|
|
|
if (pskb_may_pull(skb, nh + offset + 2 - skb->data)) {
|
2005-04-17 06:20:36 +08:00
|
|
|
u8 *icmp = (u8 *)exthdr;
|
|
|
|
|
|
|
|
fl->fl_icmp_type = icmp[0];
|
|
|
|
fl->fl_icmp_code = icmp[1];
|
|
|
|
}
|
|
|
|
fl->proto = nexthdr;
|
|
|
|
return;
|
|
|
|
|
2007-06-27 14:56:32 +08:00
|
|
|
#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
|
2006-08-24 11:39:03 +08:00
|
|
|
case IPPROTO_MH:
|
2007-04-11 11:50:43 +08:00
|
|
|
if (pskb_may_pull(skb, nh + offset + 3 - skb->data)) {
|
2006-08-24 11:39:03 +08:00
|
|
|
struct ip6_mh *mh;
|
|
|
|
mh = (struct ip6_mh *)exthdr;
|
|
|
|
|
|
|
|
fl->fl_mh_type = mh->ip6mh_type;
|
|
|
|
}
|
|
|
|
fl->proto = nexthdr;
|
|
|
|
return;
|
|
|
|
#endif
|
|
|
|
|
2005-04-17 06:20:36 +08:00
|
|
|
/* XXX Why are there these headers? */
|
|
|
|
case IPPROTO_AH:
|
|
|
|
case IPPROTO_ESP:
|
|
|
|
case IPPROTO_COMP:
|
|
|
|
default:
|
|
|
|
fl->fl_ipsec_spi = 0;
|
|
|
|
fl->proto = nexthdr;
|
|
|
|
return;
|
2007-04-21 08:09:22 +08:00
|
|
|
}
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline int xfrm6_garbage_collect(void)
|
|
|
|
{
|
|
|
|
xfrm6_policy_afinfo.garbage_collect();
|
|
|
|
return (atomic_read(&xfrm6_dst_ops.entries) > xfrm6_dst_ops.gc_thresh*2);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void xfrm6_update_pmtu(struct dst_entry *dst, u32 mtu)
|
|
|
|
{
|
|
|
|
struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
|
|
|
|
struct dst_entry *path = xdst->route;
|
|
|
|
|
|
|
|
path->ops->update_pmtu(path, mtu);
|
|
|
|
}
|
|
|
|
|
2005-05-04 07:27:10 +08:00
|
|
|
static void xfrm6_dst_destroy(struct dst_entry *dst)
|
|
|
|
{
|
|
|
|
struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
|
|
|
|
|
|
|
|
if (likely(xdst->u.rt6.rt6i_idev))
|
|
|
|
in6_dev_put(xdst->u.rt6.rt6i_idev);
|
|
|
|
xfrm_dst_destroy(xdst);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void xfrm6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
|
|
|
|
int unregister)
|
|
|
|
{
|
|
|
|
struct xfrm_dst *xdst;
|
|
|
|
|
|
|
|
if (!unregister)
|
|
|
|
return;
|
|
|
|
|
|
|
|
xdst = (struct xfrm_dst *)dst;
|
|
|
|
if (xdst->u.rt6.rt6i_idev->dev == dev) {
|
2007-09-27 13:10:56 +08:00
|
|
|
struct inet6_dev *loopback_idev = in6_dev_get(init_net.loopback_dev);
|
2005-05-04 07:27:10 +08:00
|
|
|
BUG_ON(!loopback_idev);
|
|
|
|
|
|
|
|
do {
|
|
|
|
in6_dev_put(xdst->u.rt6.rt6i_idev);
|
|
|
|
xdst->u.rt6.rt6i_idev = loopback_idev;
|
|
|
|
in6_dev_hold(loopback_idev);
|
|
|
|
xdst = (struct xfrm_dst *)xdst->u.dst.child;
|
|
|
|
} while (xdst->u.dst.xfrm);
|
|
|
|
|
|
|
|
__in6_dev_put(loopback_idev);
|
|
|
|
}
|
|
|
|
|
|
|
|
xfrm_dst_ifdown(dst, dev);
|
|
|
|
}
|
|
|
|
|
2005-04-17 06:20:36 +08:00
|
|
|
static struct dst_ops xfrm6_dst_ops = {
|
|
|
|
.family = AF_INET6,
|
|
|
|
.protocol = __constant_htons(ETH_P_IPV6),
|
|
|
|
.gc = xfrm6_garbage_collect,
|
|
|
|
.update_pmtu = xfrm6_update_pmtu,
|
2005-05-04 07:27:10 +08:00
|
|
|
.destroy = xfrm6_dst_destroy,
|
|
|
|
.ifdown = xfrm6_dst_ifdown,
|
2005-04-17 06:20:36 +08:00
|
|
|
.gc_thresh = 1024,
|
|
|
|
.entry_size = sizeof(struct xfrm_dst),
|
|
|
|
};
|
|
|
|
|
|
|
|
static struct xfrm_policy_afinfo xfrm6_policy_afinfo = {
|
|
|
|
.family = AF_INET6,
|
|
|
|
.dst_ops = &xfrm6_dst_ops,
|
|
|
|
.dst_lookup = xfrm6_dst_lookup,
|
2006-09-20 03:57:34 +08:00
|
|
|
.get_saddr = xfrm6_get_saddr,
|
2005-04-17 06:20:36 +08:00
|
|
|
.find_bundle = __xfrm6_find_bundle,
|
|
|
|
.bundle_create = __xfrm6_bundle_create,
|
|
|
|
.decode_session = _decode_session6,
|
|
|
|
};
|
|
|
|
|
|
|
|
static void __init xfrm6_policy_init(void)
|
|
|
|
{
|
|
|
|
xfrm_policy_register_afinfo(&xfrm6_policy_afinfo);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void xfrm6_policy_fini(void)
|
|
|
|
{
|
|
|
|
xfrm_policy_unregister_afinfo(&xfrm6_policy_afinfo);
|
|
|
|
}
|
|
|
|
|
|
|
|
void __init xfrm6_init(void)
|
|
|
|
{
|
|
|
|
xfrm6_policy_init();
|
|
|
|
xfrm6_state_init();
|
|
|
|
}
|
|
|
|
|
|
|
|
void xfrm6_fini(void)
|
|
|
|
{
|
|
|
|
//xfrm6_input_fini();
|
|
|
|
xfrm6_policy_fini();
|
|
|
|
xfrm6_state_fini();
|
|
|
|
}
|