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-rw-r--r--fs/lockd/mon.c113
1 files changed, 87 insertions, 26 deletions
diff --git a/fs/lockd/mon.c b/fs/lockd/mon.c
index 908b23fadd05..e4d563543b11 100644
--- a/fs/lockd/mon.c
+++ b/fs/lockd/mon.c
@@ -18,6 +18,8 @@
#define NLMDBG_FACILITY NLMDBG_MONITOR
+#define XDR_ADDRBUF_LEN (20)
+
static struct rpc_clnt * nsm_create(void);
static struct rpc_program nsm_program;
@@ -147,28 +149,55 @@ nsm_create(void)
/*
* XDR functions for NSM.
+ *
+ * See http://www.opengroup.org/ for details on the Network
+ * Status Monitor wire protocol.
*/
-static __be32 *
-xdr_encode_common(struct rpc_rqst *rqstp, __be32 *p, struct nsm_args *argp)
+static __be32 *xdr_encode_nsm_string(__be32 *p, char *string)
{
- char buffer[20], *name;
-
- /*
- * Use the dotted-quad IP address of the remote host as
- * identifier. Linux statd always looks up the canonical
- * hostname first for whatever remote hostname it receives,
- * so this works alright.
- */
- if (nsm_use_hostnames) {
- name = argp->mon_name;
- } else {
- sprintf(buffer, "%u.%u.%u.%u", NIPQUAD(argp->addr));
+ size_t len = strlen(string);
+
+ if (len > SM_MAXSTRLEN)
+ len = SM_MAXSTRLEN;
+ return xdr_encode_opaque(p, string, len);
+}
+
+/*
+ * "mon_name" specifies the host to be monitored.
+ *
+ * Linux uses a text version of the IP address of the remote
+ * host as the host identifier (the "mon_name" argument).
+ *
+ * Linux statd always looks up the canonical hostname first for
+ * whatever remote hostname it receives, so this works alright.
+ */
+static __be32 *xdr_encode_mon_name(__be32 *p, struct nsm_args *argp)
+{
+ char buffer[XDR_ADDRBUF_LEN + 1];
+ char *name = argp->mon_name;
+
+ if (!nsm_use_hostnames) {
+ snprintf(buffer, XDR_ADDRBUF_LEN,
+ NIPQUAD_FMT, NIPQUAD(argp->addr));
name = buffer;
}
- if (!(p = xdr_encode_string(p, name))
- || !(p = xdr_encode_string(p, utsname()->nodename)))
+
+ return xdr_encode_nsm_string(p, name);
+}
+
+/*
+ * The "my_id" argument specifies the hostname and RPC procedure
+ * to be called when the status manager receives notification
+ * (via the SM_NOTIFY call) that the state of host "mon_name"
+ * has changed.
+ */
+static __be32 *xdr_encode_my_id(__be32 *p, struct nsm_args *argp)
+{
+ p = xdr_encode_nsm_string(p, utsname()->nodename);
+ if (!p)
return ERR_PTR(-EIO);
+
*p++ = htonl(argp->prog);
*p++ = htonl(argp->vers);
*p++ = htonl(argp->proc);
@@ -176,18 +205,48 @@ xdr_encode_common(struct rpc_rqst *rqstp, __be32 *p, struct nsm_args *argp)
return p;
}
-static int
-xdr_encode_mon(struct rpc_rqst *rqstp, __be32 *p, struct nsm_args *argp)
+/*
+ * The "mon_id" argument specifies the non-private arguments
+ * of an SM_MON or SM_UNMON call.
+ */
+static __be32 *xdr_encode_mon_id(__be32 *p, struct nsm_args *argp)
{
- p = xdr_encode_common(rqstp, p, argp);
- if (IS_ERR(p))
- return PTR_ERR(p);
+ p = xdr_encode_mon_name(p, argp);
+ if (!p)
+ return ERR_PTR(-EIO);
- /* Surprise - there may even be room for an IPv6 address now */
+ return xdr_encode_my_id(p, argp);
+}
+
+/*
+ * The "priv" argument may contain private information required
+ * by the SM_MON call. This information will be supplied in the
+ * SM_NOTIFY call.
+ *
+ * Linux provides the raw IP address of the monitored host,
+ * left in network byte order.
+ */
+static __be32 *xdr_encode_priv(__be32 *p, struct nsm_args *argp)
+{
*p++ = argp->addr;
*p++ = 0;
*p++ = 0;
*p++ = 0;
+
+ return p;
+}
+
+static int
+xdr_encode_mon(struct rpc_rqst *rqstp, __be32 *p, struct nsm_args *argp)
+{
+ p = xdr_encode_mon_id(p, argp);
+ if (IS_ERR(p))
+ return PTR_ERR(p);
+
+ p = xdr_encode_priv(p, argp);
+ if (IS_ERR(p))
+ return PTR_ERR(p);
+
rqstp->rq_slen = xdr_adjust_iovec(rqstp->rq_svec, p);
return 0;
}
@@ -195,7 +254,7 @@ xdr_encode_mon(struct rpc_rqst *rqstp, __be32 *p, struct nsm_args *argp)
static int
xdr_encode_unmon(struct rpc_rqst *rqstp, __be32 *p, struct nsm_args *argp)
{
- p = xdr_encode_common(rqstp, p, argp);
+ p = xdr_encode_mon_id(p, argp);
if (IS_ERR(p))
return PTR_ERR(p);
rqstp->rq_slen = xdr_adjust_iovec(rqstp->rq_svec, p);
@@ -220,9 +279,11 @@ xdr_decode_stat(struct rpc_rqst *rqstp, __be32 *p, struct nsm_res *resp)
}
#define SM_my_name_sz (1+XDR_QUADLEN(SM_MAXSTRLEN))
-#define SM_my_id_sz (3+1+SM_my_name_sz)
-#define SM_mon_id_sz (1+XDR_QUADLEN(20)+SM_my_id_sz)
-#define SM_mon_sz (SM_mon_id_sz+4)
+#define SM_my_id_sz (SM_my_name_sz+3)
+#define SM_mon_name_sz (1+XDR_QUADLEN(SM_MAXSTRLEN))
+#define SM_mon_id_sz (SM_mon_name_sz+SM_my_id_sz)
+#define SM_priv_sz (XDR_QUADLEN(SM_PRIV_SIZE))
+#define SM_mon_sz (SM_mon_id_sz+SM_priv_sz)
#define SM_monres_sz 2
#define SM_unmonres_sz 1