nfsd4: don't try to map gid's in generic rpc code
J. Bruce Fields [Tue, 20 Oct 2009 22:51:34 +0000 (18:51 -0400)]
For nfsd we provide users the option of mapping uid's to server-side
supplementary group lists.  That makes sense for nfsd, but not
necessarily for other rpc users (such as the callback client).

So move that lookup to svcauth_unix_set_client, which is a
program-specific method.

Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>

net/sunrpc/svcauth_unix.c

index 117f68a..97cc3de 100644 (file)
@@ -655,23 +655,25 @@ static struct unix_gid *unix_gid_lookup(uid_t uid)
                return NULL;
 }
 
-static int unix_gid_find(uid_t uid, struct group_info **gip,
-                        struct svc_rqst *rqstp)
+static struct group_info *unix_gid_find(uid_t uid, struct svc_rqst *rqstp)
 {
-       struct unix_gid *ug = unix_gid_lookup(uid);
+       struct unix_gid *ug;
+       struct group_info *gi;
+       int ret;
+
+       ug = unix_gid_lookup(uid);
        if (!ug)
-               return -EAGAIN;
-       switch (cache_check(&unix_gid_cache, &ug->h, &rqstp->rq_chandle)) {
+               return ERR_PTR(-EAGAIN);
+       ret = cache_check(&unix_gid_cache, &ug->h, &rqstp->rq_chandle);
+       switch (ret) {
        case -ENOENT:
-               *gip = NULL;
-               return 0;
+               return ERR_PTR(-ENOENT);
        case 0:
-               *gip = ug->gi;
-               get_group_info(*gip);
+               gi = get_group_info(ug->gi);
                cache_put(&ug->h, &unix_gid_cache);
-               return 0;
+               return gi;
        default:
-               return -EAGAIN;
+               return ERR_PTR(-EAGAIN);
        }
 }
 
@@ -681,6 +683,8 @@ svcauth_unix_set_client(struct svc_rqst *rqstp)
        struct sockaddr_in *sin;
        struct sockaddr_in6 *sin6, sin6_storage;
        struct ip_map *ipm;
+       struct group_info *gi;
+       struct svc_cred *cred = &rqstp->rq_cred;
 
        switch (rqstp->rq_addr.ss_family) {
        case AF_INET:
@@ -722,6 +726,17 @@ svcauth_unix_set_client(struct svc_rqst *rqstp)
                        ip_map_cached_put(rqstp, ipm);
                        break;
        }
+
+       gi = unix_gid_find(cred->cr_uid, rqstp);
+       switch (PTR_ERR(gi)) {
+       case -EAGAIN:
+               return SVC_DROP;
+       case -ENOENT:
+               break;
+       default:
+               put_group_info(cred->cr_group_info);
+               cred->cr_group_info = gi;
+       }
        return SVC_OK;
 }
 
@@ -818,19 +833,11 @@ svcauth_unix_accept(struct svc_rqst *rqstp, __be32 *authp)
        slen = svc_getnl(argv);                 /* gids length */
        if (slen > 16 || (len -= (slen + 2)*4) < 0)
                goto badcred;
-       if (unix_gid_find(cred->cr_uid, &cred->cr_group_info, rqstp)
-           == -EAGAIN)
+       cred->cr_group_info = groups_alloc(slen);
+       if (cred->cr_group_info == NULL)
                return SVC_DROP;
-       if (cred->cr_group_info == NULL) {
-               cred->cr_group_info = groups_alloc(slen);
-               if (cred->cr_group_info == NULL)
-                       return SVC_DROP;
-               for (i = 0; i < slen; i++)
-                       GROUP_AT(cred->cr_group_info, i) = svc_getnl(argv);
-       } else {
-               for (i = 0; i < slen ; i++)
-                       svc_getnl(argv);
-       }
+       for (i = 0; i < slen; i++)
+               GROUP_AT(cred->cr_group_info, i) = svc_getnl(argv);
        if (svc_getu32(argv) != htonl(RPC_AUTH_NULL) || svc_getu32(argv) != 0) {
                *authp = rpc_autherr_badverf;
                return SVC_DENIED;