From: Andy Adamson <andros@umich.edu>
Date: Fri, 18 May 2007 16:52:39 -0400
SUNRPC: Add a helper function to convert a GSS triple into pseudoflavor

Helper function for OP_SECINFO. Return the pseudoflavor for a supported security
mechanism OID, qop, and service. Return RPC_AUTH_MAXFLAVOR upon failure.

Signed-off-by: Andy Adamson <andros@citi.umich.edu>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
---

 include/linux/sunrpc/gss_api.h        |    1 +
 net/sunrpc/auth_gss/gss_mech_switch.c |   38 +++++++++++++++++++++++++++++++++
 2 files changed, 39 insertions(+), 0 deletions(-)

diff --git a/include/linux/sunrpc/gss_api.h b/include/linux/sunrpc/gss_api.h
index 5eca9e4..ac71e2b 100644
--- a/include/linux/sunrpc/gss_api.h
+++ b/include/linux/sunrpc/gss_api.h
@@ -60,6 +60,7 @@ u32 gss_delete_sec_context(
 
 u32 gss_pseudoflavor_to_service(struct gss_api_mech *, u32 pseudoflavor);
 char *gss_service_to_auth_domain_name(struct gss_api_mech *, u32 service);
+u32 gss_triple_to_pseudoflavor(u32 oidlen, char *oiddata, u32 qop, u32 service);
 
 struct pf_desc {
 	u32	pseudoflavor;
diff --git a/net/sunrpc/auth_gss/gss_mech_switch.c b/net/sunrpc/auth_gss/gss_mech_switch.c
index 2687251..b1eebba 100644
--- a/net/sunrpc/auth_gss/gss_mech_switch.c
+++ b/net/sunrpc/auth_gss/gss_mech_switch.c
@@ -194,6 +194,44 @@ gss_mech_get_by_pseudoflavor(u32 pseudoflavor)
 EXPORT_SYMBOL(gss_mech_get_by_pseudoflavor);
 
 u32
+gss_triple_to_pseudoflavor(u32 oid_len, char *oid_data, u32 qop, u32 service)
+{
+	struct gss_api_mech *pos, *gm = NULL;
+	struct xdr_netobj oid = {
+		.len = oid_len,
+		.data = oid_data,
+	};
+	u32 pseudoflavor = RPC_AUTH_MAXFLAVOR;
+	int i;
+
+	/* Only support default QOP */
+	if (qop != 0)
+		goto out;
+
+	spin_lock(&registered_mechs_lock);
+	list_for_each_entry(pos, &registered_mechs, gm_list) {
+		if (g_OID_equal(&oid, &pos->gm_oid)) {
+			gm = pos;
+			break;
+		}
+	}
+	if (!gm)
+		goto out_locked;
+
+	for (i = 0; i < gm->gm_pf_num; i++) {
+		if (service == gm->gm_pfs[i].service) {
+			pseudoflavor = gm->gm_pfs[i].pseudoflavor;
+			break;
+		}
+	}
+out_locked:
+	spin_unlock(&registered_mechs_lock);
+out:
+	return pseudoflavor;
+}
+EXPORT_SYMBOL(gss_triple_to_pseudoflavor);
+
+u32
 gss_pseudoflavor_to_service(struct gss_api_mech *gm, u32 pseudoflavor)
 {
 	int i;