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-rw-r--r--fs/lockd/xdr.c605
1 files changed, 605 insertions, 0 deletions
diff --git a/fs/lockd/xdr.c b/fs/lockd/xdr.c
new file mode 100644
index 000000000..9c23733ac
--- /dev/null
+++ b/fs/lockd/xdr.c
@@ -0,0 +1,605 @@
+/*
+ * linux/fs/lockd/xdr.c
+ *
+ * XDR support for lockd and the lock client.
+ *
+ * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
+ */
+
+#include <linux/types.h>
+#include <linux/sched.h>
+#include <linux/utsname.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>
+#include <linux/lockd/sm_inter.h>
+
+#define NLMDBG_FACILITY NLMDBG_XDR
+#define NLM_MAXSTRLEN 1024
+
+#define QUADLEN(len) (((len) + 3) >> 2)
+
+
+u32 nlm_granted, nlm_lck_denied, nlm_lck_denied_nolocks,
+ nlm_lck_blocked, nlm_lck_denied_grace_period;
+
+
+typedef struct nlm_args nlm_args;
+
+/*
+ * Initialization of NFS status variables
+ */
+void
+nlmxdr_init(void)
+{
+ static int inited = 0;
+
+ if (inited)
+ return;
+
+ nlm_granted = htonl(NLM_LCK_GRANTED);
+ nlm_lck_denied = htonl(NLM_LCK_DENIED);
+ nlm_lck_denied_nolocks = htonl(NLM_LCK_DENIED_NOLOCKS);
+ nlm_lck_blocked = htonl(NLM_LCK_BLOCKED);
+ nlm_lck_denied_grace_period = htonl(NLM_LCK_DENIED_GRACE_PERIOD);
+
+ inited = 1;
+}
+
+/*
+ * XDR functions for basic NLM types
+ */
+static inline u32 *
+nlm_decode_cookie(u32 *p, u32 *c)
+{
+ unsigned int len;
+
+ if ((len = ntohl(*p++)) == 4) {
+ *c = ntohl(*p++);
+ } else if (len == 0) { /* hockeypux brain damage */
+ *c = 0;
+ } else {
+ printk(KERN_NOTICE
+ "lockd: bad cookie size %d (should be 4)\n", len);
+ return NULL;
+ }
+ return p;
+}
+
+static inline u32 *
+nlm_encode_cookie(u32 *p, u32 c)
+{
+ *p++ = htonl(sizeof(c));
+ *p++ = htonl(c);
+ return p;
+}
+
+static inline u32 *
+nlm_decode_fh(u32 *p, struct nfs_fh *f)
+{
+ unsigned int len;
+
+ if ((len = ntohl(*p++)) != sizeof(*f)) {
+ printk(KERN_NOTICE
+ "lockd: bad fhandle size %x (should be %d)\n",
+ len, sizeof(*f));
+ return NULL;
+ }
+ memcpy(f, p, sizeof(*f));
+ return p + XDR_QUADLEN(sizeof(*f));
+}
+
+static inline u32 *
+nlm_encode_fh(u32 *p, struct nfs_fh *f)
+{
+ *p++ = htonl(sizeof(*f));
+ memcpy(p, f, sizeof(*f));
+ return p + XDR_QUADLEN(sizeof(*f));
+}
+
+/*
+ * Encode and decode owner handle
+ */
+static inline u32 *
+nlm_decode_oh(u32 *p, struct xdr_netobj *oh)
+{
+ return xdr_decode_netobj(p, oh);
+}
+
+static inline u32 *
+nlm_encode_oh(u32 *p, struct xdr_netobj *oh)
+{
+ return xdr_encode_netobj(p, oh);
+}
+
+static inline u32 *
+nlm_decode_lock(u32 *p, struct nlm_lock *lock)
+{
+ struct file_lock *fl = &lock->fl;
+ int len;
+
+ if (!(p = xdr_decode_string(p, &lock->caller, &len, NLM_MAXSTRLEN))
+ || !(p = nlm_decode_fh(p, &lock->fh))
+ || !(p = nlm_decode_oh(p, &lock->oh)))
+ return NULL;
+
+ memset(fl, 0, sizeof(*fl));
+ fl->fl_owner = current;
+ fl->fl_pid = ntohl(*p++);
+ fl->fl_flags = FL_POSIX;
+ fl->fl_type = F_RDLCK; /* as good as anything else */
+ fl->fl_start = ntohl(*p++);
+ len = ntohl(*p++);
+ if (len == 0 || (fl->fl_end = fl->fl_start + len - 1) < 0)
+ fl->fl_end = NLM_OFFSET_MAX;
+ return p;
+}
+
+/*
+ * Encode a lock as part of an NLM call
+ */
+static u32 *
+nlm_encode_lock(u32 *p, struct nlm_lock *lock)
+{
+ struct file_lock *fl = &lock->fl;
+
+ if (!(p = xdr_encode_string(p, lock->caller))
+ || !(p = nlm_encode_fh(p, &lock->fh))
+ || !(p = nlm_encode_oh(p, &lock->oh)))
+ return NULL;
+
+ *p++ = htonl(fl->fl_pid);
+ *p++ = htonl(lock->fl.fl_start);
+ if (lock->fl.fl_end == NLM_OFFSET_MAX)
+ *p++ = xdr_zero;
+ else
+ *p++ = htonl(lock->fl.fl_end - lock->fl.fl_start + 1);
+
+ return p;
+}
+
+/*
+ * Encode result of a TEST/TEST_MSG call
+ */
+static u32 *
+nlm_encode_testres(u32 *p, struct nlm_res *resp)
+{
+ if (!(p = nlm_encode_cookie(p, resp->cookie)))
+ return 0;
+ *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(fl->fl_pid);
+
+ /* Encode owner handle. */
+ if (!(p = xdr_encode_netobj(p, &resp->lock.oh)))
+ return 0;
+
+ *p++ = htonl(fl->fl_start);
+ if (fl->fl_end == NLM_OFFSET_MAX)
+ *p++ = xdr_zero;
+ else
+ *p++ = htonl(fl->fl_end - fl->fl_start + 1);
+ }
+
+ return p;
+}
+
+/*
+ * Check buffer bounds after decoding arguments
+ */
+static inline int
+xdr_argsize_check(struct svc_rqst *rqstp, u32 *p)
+{
+ struct svc_buf *buf = &rqstp->rq_argbuf;
+
+ return p - buf->base <= buf->buflen;
+}
+
+static inline int
+xdr_ressize_check(struct svc_rqst *rqstp, u32 *p)
+{
+ struct svc_buf *buf = &rqstp->rq_resbuf;
+
+ buf->len = p - buf->base;
+ return (buf->len <= buf->buflen);
+}
+
+/*
+ * First, the server side XDR functions
+ */
+int
+nlmsvc_decode_testargs(struct svc_rqst *rqstp, u32 *p, nlm_args *argp)
+{
+ u32 exclusive;
+
+ if (!(p = nlm_decode_cookie(p, &argp->cookie)))
+ return 0;
+
+ exclusive = ntohl(*p++);
+ if (!(p = nlm_decode_lock(p, &argp->lock)))
+ return 0;
+ if (exclusive)
+ argp->lock.fl.fl_type = F_WRLCK;
+
+ return xdr_argsize_check(rqstp, p);
+}
+
+int
+nlmsvc_encode_testres(struct svc_rqst *rqstp, u32 *p, struct nlm_res *resp)
+{
+ if (!(p = nlm_encode_testres(p, resp)))
+ return 0;
+ return xdr_ressize_check(rqstp, p);
+}
+
+int
+nlmsvc_decode_lockargs(struct svc_rqst *rqstp, u32 *p, nlm_args *argp)
+{
+ u32 exclusive;
+
+ if (!(p = nlm_decode_cookie(p, &argp->cookie)))
+ return 0;
+ argp->block = ntohl(*p++);
+ exclusive = ntohl(*p++);
+ if (!(p = nlm_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
+nlmsvc_decode_cancargs(struct svc_rqst *rqstp, u32 *p, nlm_args *argp)
+{
+ u32 exclusive;
+
+ if (!(p = nlm_decode_cookie(p, &argp->cookie)))
+ return 0;
+ argp->block = ntohl(*p++);
+ exclusive = ntohl(*p++);
+ if (!(p = nlm_decode_lock(p, &argp->lock)))
+ return 0;
+ if (exclusive)
+ argp->lock.fl.fl_type = F_WRLCK;
+ return xdr_argsize_check(rqstp, p);
+}
+
+int
+nlmsvc_decode_unlockargs(struct svc_rqst *rqstp, u32 *p, nlm_args *argp)
+{
+ if (!(p = nlm_decode_cookie(p, &argp->cookie))
+ || !(p = nlm_decode_lock(p, &argp->lock)))
+ return 0;
+ argp->lock.fl.fl_type = F_UNLCK;
+ return xdr_argsize_check(rqstp, p);
+}
+
+int
+nlmsvc_decode_shareargs(struct svc_rqst *rqstp, u32 *p, nlm_args *argp)
+{
+ struct nlm_lock *lock = &argp->lock;
+ int len;
+
+ memset(lock, 0, sizeof(*lock));
+ lock->fl.fl_pid = ~(u32) 0;
+
+ if (!(p = nlm_decode_cookie(p, &argp->cookie))
+ || !(p = xdr_decode_string(p, &lock->caller, &len, NLM_MAXSTRLEN))
+ || !(p = nlm_decode_fh(p, &lock->fh))
+ || !(p = nlm_decode_oh(p, &lock->oh)))
+ return 0;
+ argp->fsm_mode = ntohl(*p++);
+ argp->fsm_access = ntohl(*p++);
+ return xdr_argsize_check(rqstp, p);
+}
+
+int
+nlmsvc_encode_shareres(struct svc_rqst *rqstp, u32 *p, struct nlm_res *resp)
+{
+ if (!(p = nlm_encode_cookie(p, resp->cookie)))
+ return 0;
+ *p++ = resp->status;
+ *p++ = xdr_zero; /* sequence argument */
+ return xdr_ressize_check(rqstp, p);
+}
+
+int
+nlmsvc_encode_res(struct svc_rqst *rqstp, u32 *p, struct nlm_res *resp)
+{
+ if (!(p = nlm_encode_cookie(p, resp->cookie)))
+ return 0;
+ *p++ = resp->status;
+ return xdr_ressize_check(rqstp, p);
+}
+
+int
+nlmsvc_decode_notify(struct svc_rqst *rqstp, u32 *p, struct nlm_args *argp)
+{
+ struct nlm_lock *lock = &argp->lock;
+ int len;
+
+ if (!(p = xdr_decode_string(p, &lock->caller, &len, NLM_MAXSTRLEN)))
+ return 0;
+ argp->state = ntohl(*p++);
+ return xdr_argsize_check(rqstp, p);
+}
+
+int
+nlmsvc_decode_reboot(struct svc_rqst *rqstp, u32 *p, struct nlm_reboot *argp)
+{
+ if (!(p = xdr_decode_string(p, &argp->mon, &argp->len, SM_MAXSTRLEN)))
+ return 0;
+ argp->state = ntohl(*p++);
+ argp->addr = ntohl(*p++);
+ return xdr_argsize_check(rqstp, p);
+}
+
+int
+nlmsvc_decode_res(struct svc_rqst *rqstp, u32 *p, struct nlm_res *resp)
+{
+ if (!(p = nlm_decode_cookie(p, &resp->cookie)))
+ return 0;
+ resp->status = ntohl(*p++);
+ return xdr_argsize_check(rqstp, p);
+}
+
+int
+nlmsvc_decode_void(struct svc_rqst *rqstp, u32 *p, void *dummy)
+{
+ return xdr_argsize_check(rqstp, p);
+}
+
+int
+nlmsvc_encode_void(struct svc_rqst *rqstp, u32 *p, void *dummy)
+{
+ return xdr_ressize_check(rqstp, p);
+}
+
+/*
+ * Now, the client side XDR functions
+ */
+static int
+nlmclt_encode_void(struct rpc_rqst *req, u32 *p, void *ptr)
+{
+ req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
+ return 0;
+}
+
+static int
+nlmclt_decode_void(struct rpc_rqst *req, u32 *p, void *ptr)
+{
+ return 0;
+}
+
+static int
+nlmclt_encode_testargs(struct rpc_rqst *req, u32 *p, nlm_args *argp)
+{
+ struct nlm_lock *lock = &argp->lock;
+
+ if (!(p = nlm_encode_cookie(p, argp->cookie)))
+ return -EIO;
+ *p++ = (lock->fl.fl_type == F_WRLCK)? xdr_one : xdr_zero;
+ if (!(p = nlm_encode_lock(p, lock)))
+ return -EIO;
+ req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
+ return 0;
+}
+
+static int
+nlmclt_decode_testres(struct rpc_rqst *req, u32 *p, struct nlm_res *resp)
+{
+ if (!(p = nlm_decode_cookie(p, &resp->cookie)))
+ return -EIO;
+ resp->status = ntohl(*p++);
+ if (resp->status == NLM_LCK_DENIED) {
+ struct file_lock *fl = &resp->lock.fl;
+ u32 excl, len;
+
+ memset(&resp->lock, 0, sizeof(resp->lock));
+ excl = ntohl(*p++);
+ fl->fl_pid = ntohl(*p++);
+ if (!(p = nlm_decode_oh(p, &resp->lock.oh)))
+ return -EIO;
+
+ fl->fl_flags = FL_POSIX;
+ fl->fl_type = excl? F_WRLCK : F_RDLCK;
+ fl->fl_start = ntohl(*p++);
+ len = ntohl(*p++);
+ if (len == 0 || (fl->fl_end = fl->fl_start + len - 1) < 0)
+ fl->fl_end = NLM_OFFSET_MAX;
+ }
+ return 0;
+}
+
+
+static int
+nlmclt_encode_lockargs(struct rpc_rqst *req, u32 *p, nlm_args *argp)
+{
+ struct nlm_lock *lock = &argp->lock;
+
+ if (!(p = nlm_encode_cookie(p, argp->cookie)))
+ return -EIO;
+ *p++ = argp->block? xdr_one : xdr_zero;
+ *p++ = (lock->fl.fl_type == F_WRLCK)? xdr_one : xdr_zero;
+ if (!(p = nlm_encode_lock(p, lock)))
+ return -EIO;
+ *p++ = argp->reclaim? xdr_one : xdr_zero;
+ *p++ = htonl(argp->state);
+ req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
+ return 0;
+}
+
+static int
+nlmclt_encode_cancargs(struct rpc_rqst *req, u32 *p, nlm_args *argp)
+{
+ struct nlm_lock *lock = &argp->lock;
+
+ if (!(p = nlm_encode_cookie(p, argp->cookie)))
+ return -EIO;
+ *p++ = argp->block? xdr_one : xdr_zero;
+ *p++ = (lock->fl.fl_type == F_WRLCK)? xdr_one : xdr_zero;
+ if (!(p = nlm_encode_lock(p, lock)))
+ return -EIO;
+ req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
+ return 0;
+}
+
+static int
+nlmclt_encode_unlockargs(struct rpc_rqst *req, u32 *p, nlm_args *argp)
+{
+ struct nlm_lock *lock = &argp->lock;
+
+ if (!(p = nlm_encode_cookie(p, argp->cookie)))
+ return -EIO;
+ if (!(p = nlm_encode_lock(p, lock)))
+ return -EIO;
+ req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
+ return 0;
+}
+
+static int
+nlmclt_encode_res(struct rpc_rqst *req, u32 *p, struct nlm_res *resp)
+{
+ if (!(p = nlm_encode_cookie(p, resp->cookie)))
+ return -EIO;
+ *p++ = resp->status;
+ req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
+ return 0;
+}
+
+static int
+nlmclt_encode_testres(struct rpc_rqst *req, u32 *p, struct nlm_res *resp)
+{
+ if (!(p = nlm_encode_testres(p, resp)))
+ return -EIO;
+ req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
+ return 0;
+}
+
+static int
+nlmclt_decode_res(struct rpc_rqst *req, u32 *p, struct nlm_res *resp)
+{
+ if (!(p = nlm_decode_cookie(p, &resp->cookie)))
+ return -EIO;
+ resp->status = ntohl(*p++);
+ return 0;
+}
+
+/*
+ * Buffer requirements for NLM
+ */
+#define NLM_void_sz 0
+#define NLM_cookie_sz 2
+#define NLM_caller_sz 1+QUADLEN(sizeof(system_utsname.nodename))
+#define NLM_netobj_sz 1+QUADLEN(XDR_MAX_NETOBJ)
+/* #define NLM_owner_sz 1+QUADLEN(NLM_MAXOWNER) */
+#define NLM_fhandle_sz 1+QUADLEN(NFS_FHSIZE)
+#define NLM_lock_sz 3+NLM_caller_sz+NLM_netobj_sz+NLM_fhandle_sz
+#define NLM_holder_sz 4+NLM_netobj_sz
+
+#define NLM_testargs_sz NLM_cookie_sz+1+NLM_lock_sz
+#define NLM_lockargs_sz NLM_cookie_sz+4+NLM_lock_sz
+#define NLM_cancargs_sz NLM_cookie_sz+2+NLM_lock_sz
+#define NLM_unlockargs_sz NLM_cookie_sz+NLM_lock_sz
+
+#define NLM_testres_sz NLM_cookie_sz+1+NLM_holder_sz
+#define NLM_res_sz NLM_cookie_sz+1
+#define NLM_norep_sz 0
+
+#ifndef MAX
+# define MAX(a, b) (((a) > (b))? (a) : (b))
+#endif
+
+/*
+ * For NLM, a void procedure really returns nothing
+ */
+#define nlmclt_decode_norep NULL
+
+#define PROC(proc, argtype, restype) \
+ { "nlm_" #proc, \
+ (kxdrproc_t) nlmclt_encode_##argtype, \
+ (kxdrproc_t) nlmclt_decode_##restype, \
+ MAX(NLM_##argtype##_sz, NLM_##restype##_sz) << 2 \
+ }
+
+static struct rpc_procinfo nlm_procedures[] = {
+ PROC(null, void, void),
+ PROC(test, testargs, testres),
+ PROC(lock, lockargs, res),
+ PROC(canc, cancargs, res),
+ PROC(unlock, unlockargs, res),
+ PROC(granted, testargs, res),
+ PROC(test_msg, testargs, norep),
+ PROC(lock_msg, lockargs, norep),
+ PROC(canc_msg, cancargs, norep),
+ PROC(unlock_msg, unlockargs, norep),
+ PROC(granted_msg, testargs, norep),
+ PROC(test_res, testres, norep),
+ PROC(lock_res, res, norep),
+ PROC(canc_res, res, norep),
+ PROC(unlock_res, res, norep),
+ PROC(granted_res, res, norep),
+ PROC(undef, void, void),
+ PROC(undef, void, void),
+ PROC(undef, void, void),
+ PROC(undef, void, void),
+#ifdef NLMCLNT_SUPPORT_SHARES
+ PROC(share, shareargs, shareres),
+ PROC(unshare, shareargs, shareres),
+ PROC(nm_lock, lockargs, res),
+ PROC(free_all, notify, void),
+#else
+ PROC(undef, void, void),
+ PROC(undef, void, void),
+ PROC(undef, void, void),
+ PROC(undef, void, void),
+#endif
+};
+
+static struct rpc_version nlm_version1 = {
+ 1, 16, nlm_procedures,
+};
+
+static struct rpc_version nlm_version3 = {
+ 3, 24, nlm_procedures,
+};
+
+static struct rpc_version * nlm_versions[] = {
+ NULL,
+ &nlm_version1,
+ NULL,
+ &nlm_version3,
+};
+
+static struct rpc_stat nlm_stats;
+
+struct rpc_program nlm_program = {
+ "lockd",
+ NLM_PROGRAM,
+ sizeof(nlm_versions) / sizeof(nlm_versions[0]),
+ nlm_versions,
+ &nlm_stats,
+};
+
+#ifdef LOCKD_DEBUG
+char *
+nlm_procname(u32 proc)
+{
+ if (proc < sizeof(nlm_procedures)/sizeof(nlm_procedures[0]))
+ return nlm_procedures[proc].p_procname;
+ return "unknown";
+}
+#endif
+
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-10 06:28:18 +0000