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Remove policies in kernel interfaces based on their priority.

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This allows to unroute a connection while the same connection is
currently established.  In this case both CHILD_SAs share the same
reqid but the installed policies have different priorities.
This commit is contained in:
Tobias Brunner
2011-07-27 13:41:35 +02:00
parent a2e377fcfd
commit fbedc6a45b
10 changed files with 140 additions and 80 deletions
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src/libhydra/plugins/kernel_netlink/kernel_netlink_ipsec.c
+32 -15
View File
@@ -59,8 +59,7 @@
#endif /*IPV6_XFRM_POLICY*/
/** Default priority of installed policies */
#define PRIO_LOW 1024
#define PRIO_HIGH 512
#define PRIO_BASE 512
/** Default replay window size, if not set using charon.replay_window */
#define DEFAULT_REPLAY_WINDOW 32
@@ -567,6 +566,30 @@ static bool policy_equals(policy_entry_t *key, policy_entry_t *other_key)
key->direction == other_key->direction;
}
/**
* Calculate the priority of a policy
*/
static inline u_int32_t get_priority(policy_entry_t *policy,
policy_priority_t prio)
{
u_int32_t priority = PRIO_BASE;
switch (prio)
{
case POLICY_PRIORITY_ROUTED:
priority <<= 1;
/* fall-through */
case POLICY_PRIORITY_DEFAULT:
break;
}
/* calculate priority based on selector size, small size = high prio */
priority -= policy->sel.prefixlen_s;
priority -= policy->sel.prefixlen_d;
priority <<= 2; /* make some room for the two flags */
priority += policy->sel.sport_mask || policy->sel.dport_mask ? 0 : 2;
priority += policy->sel.proto ? 0 : 1;
return priority;
}
/**
* Convert the general ipsec mode to the one defined in xfrm.h
*/
@@ -2149,7 +2172,7 @@ METHOD(kernel_ipsec_t, add_policy, status_t,
private_kernel_netlink_ipsec_t *this, host_t *src, host_t *dst,
traffic_selector_t *src_ts, traffic_selector_t *dst_ts,
policy_dir_t direction, policy_type_t type, ipsec_sa_cfg_t *sa,
mark_t mark, bool routed)
mark_t mark, policy_priority_t priority)
{
policy_entry_t *policy, *current;
policy_sa_t *assigned_sa, *current_sa;
@@ -2195,15 +2218,7 @@ METHOD(kernel_ipsec_t, add_policy, status_t,
/* cache the assigned IPsec SA */
assigned_sa = policy_sa_create(this, direction, type, src, dst, src_ts,
dst_ts, mark, sa);
/* calculate priority based on selector size, small size = high prio */
assigned_sa->priority = routed ? PRIO_LOW : PRIO_HIGH;
assigned_sa->priority -= policy->sel.prefixlen_s;
assigned_sa->priority -= policy->sel.prefixlen_d;
assigned_sa->priority <<= 2; /* make some room for the two flags */
assigned_sa->priority += policy->sel.sport_mask ||
policy->sel.dport_mask ? 0 : 2;
assigned_sa->priority += policy->sel.proto ? 0 : 1;
assigned_sa->priority = get_priority(policy, priority);
/* insert the SA according to its priority */
enumerator = policy->used_by->create_enumerator(policy->used_by);
@@ -2354,7 +2369,7 @@ METHOD(kernel_ipsec_t, query_policy, status_t,
METHOD(kernel_ipsec_t, del_policy, status_t,
private_kernel_netlink_ipsec_t *this, traffic_selector_t *src_ts,
traffic_selector_t *dst_ts, policy_dir_t direction, u_int32_t reqid,
mark_t mark, bool unrouted)
mark_t mark, policy_priority_t prio)
{
policy_entry_t *current, policy;
enumerator_t *enumerator;
@@ -2363,6 +2378,7 @@ METHOD(kernel_ipsec_t, del_policy, status_t,
struct nlmsghdr *hdr;
struct xfrm_userpolicy_id *policy_id;
bool is_installed = TRUE;
u_int32_t priority;
if (mark.value)
{
@@ -2402,11 +2418,12 @@ METHOD(kernel_ipsec_t, del_policy, status_t,
return NOT_FOUND;
}
/* remove mapping to SA by reqid */
/* remove mapping to SA by reqid and priority */
priority = get_priority(current, prio);
enumerator = current->used_by->create_enumerator(current->used_by);
while (enumerator->enumerate(enumerator, (void**)&mapping))
{
if (reqid == mapping->sa->cfg.reqid)
if (reqid == mapping->sa->cfg.reqid && priority == mapping->priority)
{
current->used_by->remove_at(current->used_by, enumerator);
policy_sa_destroy(mapping, &direction, this);