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Include the destination net in the policy priority calculation.

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The resulting priorities are as follows:

    IPv6               IPv4
    routed   normal    routed   normal
max 4096(+3) 2048(+3)  4096(+3) 2048(+3)
min 3072     1024      3840     1792

Where min is for a policy between two single hosts and max is
for /0 on both ends (lower priorities are preferred by the kernel).
(+3) applies for cases where no protocol and no ports are defined.
This commit is contained in:
Tobias Brunner
2010-12-07 12:14:50 +01:00
parent 4332cd7f95
commit e6f42b0721
2 changed files with 20 additions and 12 deletions
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src/libhydra/plugins/kernel_pfkey/kernel_pfkey_ipsec.c
+9 -6
View File
@@ -99,8 +99,8 @@
#endif
/** default priority of installed policies */
#define PRIO_LOW 3000
#define PRIO_HIGH 2000
#define PRIO_LOW 1024
#define PRIO_HIGH 512
#ifdef __APPLE__
/** from xnu/bsd/net/pfkeyv2.h */
@@ -1651,11 +1651,14 @@ METHOD(kernel_ipsec_t, add_policy, status_t,
pol->sadb_x_policy_dir = dir2kernel(direction);
pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
#ifdef HAVE_STRUCT_SADB_X_POLICY_SADB_X_POLICY_PRIORITY
/* calculate priority based on source selector size, small size = high prio */
/* calculate priority based on selector size, small size = high prio */
pol->sadb_x_policy_priority = routed ? PRIO_LOW : PRIO_HIGH;
pol->sadb_x_policy_priority -= policy->src.mask * 10;
pol->sadb_x_policy_priority -= policy->src.proto != IPSEC_PROTO_ANY ? 2 : 0;
pol->sadb_x_policy_priority -= policy->src.net->get_port(policy->src.net) ? 1 : 0;
pol->sadb_x_policy_priority -= policy->src.mask;
pol->sadb_x_policy_priority -= policy->dst.mask;
pol->sadb_x_policy_priority <<= 2; /* make some room for the flags */
pol->sadb_x_policy_priority += policy->src.net->get_port(policy->src.net) ||
policy->dst.net->get_port(policy->dst.net) ? 0 : 2;
pol->sadb_x_policy_priority += policy->src.proto != IPSEC_PROTO_ANY ? 0 : 1;
#endif
/* one or more sadb_x_ipsecrequest extensions are added to the sadb_x_policy extension */