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-rw-r--r--fs/lockd/xdr4.c352
1 files changed, 352 insertions, 0 deletions
diff --git a/fs/lockd/xdr4.c b/fs/lockd/xdr4.c
new file mode 100644
index 000000000..7ed9edf9a
--- /dev/null
+++ b/fs/lockd/xdr4.c
@@ -0,0 +1,352 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * linux/fs/lockd/xdr4.c
+ *
+ * XDR support for lockd and the lock client.
+ *
+ * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
+ * Copyright (C) 1999, Trond Myklebust <trond.myklebust@fys.uio.no>
+ */
+
+#include <linux/types.h>
+#include <linux/sched.h>
+#include <linux/nfs.h>
+
+#include <linux/sunrpc/xdr.h>
+#include <linux/sunrpc/clnt.h>
+#include <linux/sunrpc/svc.h>
+#include <linux/sunrpc/stats.h>
+#include <linux/lockd/lockd.h>
+
+#define NLMDBG_FACILITY NLMDBG_XDR
+
+static inline loff_t
+s64_to_loff_t(__s64 offset)
+{
+ return (loff_t)offset;
+}
+
+
+static inline s64
+loff_t_to_s64(loff_t offset)
+{
+ s64 res;
+ if (offset > NLM4_OFFSET_MAX)
+ res = NLM4_OFFSET_MAX;
+ else if (offset < -NLM4_OFFSET_MAX)
+ res = -NLM4_OFFSET_MAX;
+ else
+ res = offset;
+ return res;
+}
+
+/*
+ * XDR functions for basic NLM types
+ */
+static __be32 *
+nlm4_decode_cookie(__be32 *p, struct nlm_cookie *c)
+{
+ unsigned int len;
+
+ len = ntohl(*p++);
+
+ if(len==0)
+ {
+ c->len=4;
+ memset(c->data, 0, 4); /* hockeypux brain damage */
+ }
+ else if(len<=NLM_MAXCOOKIELEN)
+ {
+ c->len=len;
+ memcpy(c->data, p, len);
+ p+=XDR_QUADLEN(len);
+ }
+ else
+ {
+ dprintk("lockd: bad cookie size %d (only cookies under "
+ "%d bytes are supported.)\n",
+ len, NLM_MAXCOOKIELEN);
+ return NULL;
+ }
+ return p;
+}
+
+static __be32 *
+nlm4_encode_cookie(__be32 *p, struct nlm_cookie *c)
+{
+ *p++ = htonl(c->len);
+ memcpy(p, c->data, c->len);
+ p+=XDR_QUADLEN(c->len);
+ return p;
+}
+
+static __be32 *
+nlm4_decode_fh(__be32 *p, struct nfs_fh *f)
+{
+ memset(f->data, 0, sizeof(f->data));
+ f->size = ntohl(*p++);
+ if (f->size > NFS_MAXFHSIZE) {
+ dprintk("lockd: bad fhandle size %d (should be <=%d)\n",
+ f->size, NFS_MAXFHSIZE);
+ return NULL;
+ }
+ memcpy(f->data, p, f->size);
+ return p + XDR_QUADLEN(f->size);
+}
+
+/*
+ * Encode and decode owner handle
+ */
+static __be32 *
+nlm4_decode_oh(__be32 *p, struct xdr_netobj *oh)
+{
+ return xdr_decode_netobj(p, oh);
+}
+
+static __be32 *
+nlm4_decode_lock(__be32 *p, struct nlm_lock *lock)
+{
+ struct file_lock *fl = &lock->fl;
+ __u64 len, start;
+ __s64 end;
+
+ if (!(p = xdr_decode_string_inplace(p, &lock->caller,
+ &lock->len, NLM_MAXSTRLEN))
+ || !(p = nlm4_decode_fh(p, &lock->fh))
+ || !(p = nlm4_decode_oh(p, &lock->oh)))
+ return NULL;
+ lock->svid = ntohl(*p++);
+
+ locks_init_lock(fl);
+ fl->fl_owner = current->files;
+ fl->fl_pid = (pid_t)lock->svid;
+ fl->fl_flags = FL_POSIX;
+ fl->fl_type = F_RDLCK; /* as good as anything else */
+ p = xdr_decode_hyper(p, &start);
+ p = xdr_decode_hyper(p, &len);
+ end = start + len - 1;
+
+ fl->fl_start = s64_to_loff_t(start);
+
+ if (len == 0 || end < 0)
+ fl->fl_end = OFFSET_MAX;
+ else
+ fl->fl_end = s64_to_loff_t(end);
+ return p;
+}
+
+/*
+ * Encode result of a TEST/TEST_MSG call
+ */
+static __be32 *
+nlm4_encode_testres(__be32 *p, struct nlm_res *resp)
+{
+ s64 start, len;
+
+ dprintk("xdr: before encode_testres (p %p resp %p)\n", p, resp);
+ if (!(p = nlm4_encode_cookie(p, &resp->cookie)))
+ return NULL;
+ *p++ = resp->status;
+
+ if (resp->status == nlm_lck_denied) {
+ struct file_lock *fl = &resp->lock.fl;
+
+ *p++ = (fl->fl_type == F_RDLCK)? xdr_zero : xdr_one;
+ *p++ = htonl(resp->lock.svid);
+
+ /* Encode owner handle. */
+ if (!(p = xdr_encode_netobj(p, &resp->lock.oh)))
+ return NULL;
+
+ start = loff_t_to_s64(fl->fl_start);
+ if (fl->fl_end == OFFSET_MAX)
+ len = 0;
+ else
+ len = loff_t_to_s64(fl->fl_end - fl->fl_start + 1);
+
+ p = xdr_encode_hyper(p, start);
+ p = xdr_encode_hyper(p, len);
+ dprintk("xdr: encode_testres (status %u pid %d type %d start %Ld end %Ld)\n",
+ resp->status, (int)resp->lock.svid, fl->fl_type,
+ (long long)fl->fl_start, (long long)fl->fl_end);
+ }
+
+ dprintk("xdr: after encode_testres (p %p resp %p)\n", p, resp);
+ return p;
+}
+
+
+/*
+ * First, the server side XDR functions
+ */
+int
+nlm4svc_decode_testargs(struct svc_rqst *rqstp, __be32 *p)
+{
+ struct nlm_args *argp = rqstp->rq_argp;
+ u32 exclusive;
+
+ if (!(p = nlm4_decode_cookie(p, &argp->cookie)))
+ return 0;
+
+ exclusive = ntohl(*p++);
+ if (!(p = nlm4_decode_lock(p, &argp->lock)))
+ return 0;
+ if (exclusive)
+ argp->lock.fl.fl_type = F_WRLCK;
+
+ return xdr_argsize_check(rqstp, p);
+}
+
+int
+nlm4svc_encode_testres(struct svc_rqst *rqstp, __be32 *p)
+{
+ struct nlm_res *resp = rqstp->rq_resp;
+
+ if (!(p = nlm4_encode_testres(p, resp)))
+ return 0;
+ return xdr_ressize_check(rqstp, p);
+}
+
+int
+nlm4svc_decode_lockargs(struct svc_rqst *rqstp, __be32 *p)
+{
+ struct nlm_args *argp = rqstp->rq_argp;
+ u32 exclusive;
+
+ if (!(p = nlm4_decode_cookie(p, &argp->cookie)))
+ return 0;
+ argp->block = ntohl(*p++);
+ exclusive = ntohl(*p++);
+ if (!(p = nlm4_decode_lock(p, &argp->lock)))
+ return 0;
+ if (exclusive)
+ argp->lock.fl.fl_type = F_WRLCK;
+ argp->reclaim = ntohl(*p++);
+ argp->state = ntohl(*p++);
+ argp->monitor = 1; /* monitor client by default */
+
+ return xdr_argsize_check(rqstp, p);
+}
+
+int
+nlm4svc_decode_cancargs(struct svc_rqst *rqstp, __be32 *p)
+{
+ struct nlm_args *argp = rqstp->rq_argp;
+ u32 exclusive;
+
+ if (!(p = nlm4_decode_cookie(p, &argp->cookie)))
+ return 0;
+ argp->block = ntohl(*p++);
+ exclusive = ntohl(*p++);
+ if (!(p = nlm4_decode_lock(p, &argp->lock)))
+ return 0;
+ if (exclusive)
+ argp->lock.fl.fl_type = F_WRLCK;
+ return xdr_argsize_check(rqstp, p);
+}
+
+int
+nlm4svc_decode_unlockargs(struct svc_rqst *rqstp, __be32 *p)
+{
+ struct nlm_args *argp = rqstp->rq_argp;
+
+ if (!(p = nlm4_decode_cookie(p, &argp->cookie))
+ || !(p = nlm4_decode_lock(p, &argp->lock)))
+ return 0;
+ argp->lock.fl.fl_type = F_UNLCK;
+ return xdr_argsize_check(rqstp, p);
+}
+
+int
+nlm4svc_decode_shareargs(struct svc_rqst *rqstp, __be32 *p)
+{
+ struct nlm_args *argp = rqstp->rq_argp;
+ struct nlm_lock *lock = &argp->lock;
+
+ memset(lock, 0, sizeof(*lock));
+ locks_init_lock(&lock->fl);
+ lock->svid = ~(u32) 0;
+ lock->fl.fl_pid = (pid_t)lock->svid;
+
+ if (!(p = nlm4_decode_cookie(p, &argp->cookie))
+ || !(p = xdr_decode_string_inplace(p, &lock->caller,
+ &lock->len, NLM_MAXSTRLEN))
+ || !(p = nlm4_decode_fh(p, &lock->fh))
+ || !(p = nlm4_decode_oh(p, &lock->oh)))
+ return 0;
+ argp->fsm_mode = ntohl(*p++);
+ argp->fsm_access = ntohl(*p++);
+ return xdr_argsize_check(rqstp, p);
+}
+
+int
+nlm4svc_encode_shareres(struct svc_rqst *rqstp, __be32 *p)
+{
+ struct nlm_res *resp = rqstp->rq_resp;
+
+ if (!(p = nlm4_encode_cookie(p, &resp->cookie)))
+ return 0;
+ *p++ = resp->status;
+ *p++ = xdr_zero; /* sequence argument */
+ return xdr_ressize_check(rqstp, p);
+}
+
+int
+nlm4svc_encode_res(struct svc_rqst *rqstp, __be32 *p)
+{
+ struct nlm_res *resp = rqstp->rq_resp;
+
+ if (!(p = nlm4_encode_cookie(p, &resp->cookie)))
+ return 0;
+ *p++ = resp->status;
+ return xdr_ressize_check(rqstp, p);
+}
+
+int
+nlm4svc_decode_notify(struct svc_rqst *rqstp, __be32 *p)
+{
+ struct nlm_args *argp = rqstp->rq_argp;
+ struct nlm_lock *lock = &argp->lock;
+
+ if (!(p = xdr_decode_string_inplace(p, &lock->caller,
+ &lock->len, NLM_MAXSTRLEN)))
+ return 0;
+ argp->state = ntohl(*p++);
+ return xdr_argsize_check(rqstp, p);
+}
+
+int
+nlm4svc_decode_reboot(struct svc_rqst *rqstp, __be32 *p)
+{
+ struct nlm_reboot *argp = rqstp->rq_argp;
+
+ if (!(p = xdr_decode_string_inplace(p, &argp->mon, &argp->len, SM_MAXSTRLEN)))
+ return 0;
+ argp->state = ntohl(*p++);
+ memcpy(&argp->priv.data, p, sizeof(argp->priv.data));
+ p += XDR_QUADLEN(SM_PRIV_SIZE);
+ return xdr_argsize_check(rqstp, p);
+}
+
+int
+nlm4svc_decode_res(struct svc_rqst *rqstp, __be32 *p)
+{
+ struct nlm_res *resp = rqstp->rq_argp;
+
+ if (!(p = nlm4_decode_cookie(p, &resp->cookie)))
+ return 0;
+ resp->status = *p++;
+ return xdr_argsize_check(rqstp, p);
+}
+
+int
+nlm4svc_decode_void(struct svc_rqst *rqstp, __be32 *p)
+{
+ return xdr_argsize_check(rqstp, p);
+}
+
+int
+nlm4svc_encode_void(struct svc_rqst *rqstp, __be32 *p)
+{
+ return xdr_ressize_check(rqstp, p);
+}
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