| // 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> |
| |
| #include "svcxdr.h" |
| |
| 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; |
| } |
| |
| /* |
| * NLM file handles are defined by specification to be a variable-length |
| * XDR opaque no longer than 1024 bytes. However, this implementation |
| * limits their length to the size of an NFSv3 file handle. |
| */ |
| static bool |
| svcxdr_decode_fhandle(struct xdr_stream *xdr, struct nfs_fh *fh) |
| { |
| __be32 *p; |
| u32 len; |
| |
| if (xdr_stream_decode_u32(xdr, &len) < 0) |
| return false; |
| if (len > NFS_MAXFHSIZE) |
| return false; |
| |
| p = xdr_inline_decode(xdr, len); |
| if (!p) |
| return false; |
| fh->size = len; |
| memcpy(fh->data, p, len); |
| memset(fh->data + len, 0, sizeof(fh->data) - len); |
| |
| return true; |
| } |
| |
| static bool |
| svcxdr_decode_lock(struct xdr_stream *xdr, struct nlm_lock *lock) |
| { |
| struct file_lock *fl = &lock->fl; |
| |
| if (!svcxdr_decode_string(xdr, &lock->caller, &lock->len)) |
| return false; |
| if (!svcxdr_decode_fhandle(xdr, &lock->fh)) |
| return false; |
| if (!svcxdr_decode_owner(xdr, &lock->oh)) |
| return false; |
| if (xdr_stream_decode_u32(xdr, &lock->svid) < 0) |
| return false; |
| if (xdr_stream_decode_u64(xdr, &lock->lock_start) < 0) |
| return false; |
| if (xdr_stream_decode_u64(xdr, &lock->lock_len) < 0) |
| return false; |
| |
| locks_init_lock(fl); |
| fl->fl_flags = FL_POSIX; |
| fl->fl_type = F_RDLCK; |
| |
| return true; |
| } |
| |
| static bool |
| svcxdr_encode_holder(struct xdr_stream *xdr, const struct nlm_lock *lock) |
| { |
| const struct file_lock *fl = &lock->fl; |
| s64 start, len; |
| |
| /* exclusive */ |
| if (xdr_stream_encode_bool(xdr, fl->fl_type != F_RDLCK) < 0) |
| return false; |
| if (xdr_stream_encode_u32(xdr, lock->svid) < 0) |
| return false; |
| if (!svcxdr_encode_owner(xdr, &lock->oh)) |
| return false; |
| 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); |
| if (xdr_stream_encode_u64(xdr, start) < 0) |
| return false; |
| if (xdr_stream_encode_u64(xdr, len) < 0) |
| return false; |
| |
| return true; |
| } |
| |
| static bool |
| svcxdr_encode_testrply(struct xdr_stream *xdr, const struct nlm_res *resp) |
| { |
| if (!svcxdr_encode_stats(xdr, resp->status)) |
| return false; |
| switch (resp->status) { |
| case nlm_lck_denied: |
| if (!svcxdr_encode_holder(xdr, &resp->lock)) |
| return false; |
| } |
| |
| return true; |
| } |
| |
| |
| /* |
| * Decode Call arguments |
| */ |
| |
| bool |
| nlm4svc_decode_void(struct svc_rqst *rqstp, struct xdr_stream *xdr) |
| { |
| return true; |
| } |
| |
| bool |
| nlm4svc_decode_testargs(struct svc_rqst *rqstp, struct xdr_stream *xdr) |
| { |
| struct nlm_args *argp = rqstp->rq_argp; |
| u32 exclusive; |
| |
| if (!svcxdr_decode_cookie(xdr, &argp->cookie)) |
| return false; |
| if (xdr_stream_decode_bool(xdr, &exclusive) < 0) |
| return false; |
| if (!svcxdr_decode_lock(xdr, &argp->lock)) |
| return false; |
| if (exclusive) |
| argp->lock.fl.fl_type = F_WRLCK; |
| |
| return true; |
| } |
| |
| bool |
| nlm4svc_decode_lockargs(struct svc_rqst *rqstp, struct xdr_stream *xdr) |
| { |
| struct nlm_args *argp = rqstp->rq_argp; |
| u32 exclusive; |
| |
| if (!svcxdr_decode_cookie(xdr, &argp->cookie)) |
| return false; |
| if (xdr_stream_decode_bool(xdr, &argp->block) < 0) |
| return false; |
| if (xdr_stream_decode_bool(xdr, &exclusive) < 0) |
| return false; |
| if (!svcxdr_decode_lock(xdr, &argp->lock)) |
| return false; |
| if (exclusive) |
| argp->lock.fl.fl_type = F_WRLCK; |
| if (xdr_stream_decode_bool(xdr, &argp->reclaim) < 0) |
| return false; |
| if (xdr_stream_decode_u32(xdr, &argp->state) < 0) |
| return false; |
| argp->monitor = 1; /* monitor client by default */ |
| |
| return true; |
| } |
| |
| bool |
| nlm4svc_decode_cancargs(struct svc_rqst *rqstp, struct xdr_stream *xdr) |
| { |
| struct nlm_args *argp = rqstp->rq_argp; |
| u32 exclusive; |
| |
| if (!svcxdr_decode_cookie(xdr, &argp->cookie)) |
| return false; |
| if (xdr_stream_decode_bool(xdr, &argp->block) < 0) |
| return false; |
| if (xdr_stream_decode_bool(xdr, &exclusive) < 0) |
| return false; |
| if (!svcxdr_decode_lock(xdr, &argp->lock)) |
| return false; |
| if (exclusive) |
| argp->lock.fl.fl_type = F_WRLCK; |
| |
| return true; |
| } |
| |
| bool |
| nlm4svc_decode_unlockargs(struct svc_rqst *rqstp, struct xdr_stream *xdr) |
| { |
| struct nlm_args *argp = rqstp->rq_argp; |
| |
| if (!svcxdr_decode_cookie(xdr, &argp->cookie)) |
| return false; |
| if (!svcxdr_decode_lock(xdr, &argp->lock)) |
| return false; |
| argp->lock.fl.fl_type = F_UNLCK; |
| |
| return true; |
| } |
| |
| bool |
| nlm4svc_decode_res(struct svc_rqst *rqstp, struct xdr_stream *xdr) |
| { |
| struct nlm_res *resp = rqstp->rq_argp; |
| |
| if (!svcxdr_decode_cookie(xdr, &resp->cookie)) |
| return false; |
| if (!svcxdr_decode_stats(xdr, &resp->status)) |
| return false; |
| |
| return true; |
| } |
| |
| bool |
| nlm4svc_decode_reboot(struct svc_rqst *rqstp, struct xdr_stream *xdr) |
| { |
| struct nlm_reboot *argp = rqstp->rq_argp; |
| __be32 *p; |
| u32 len; |
| |
| if (xdr_stream_decode_u32(xdr, &len) < 0) |
| return false; |
| if (len > SM_MAXSTRLEN) |
| return false; |
| p = xdr_inline_decode(xdr, len); |
| if (!p) |
| return false; |
| argp->len = len; |
| argp->mon = (char *)p; |
| if (xdr_stream_decode_u32(xdr, &argp->state) < 0) |
| return false; |
| p = xdr_inline_decode(xdr, SM_PRIV_SIZE); |
| if (!p) |
| return false; |
| memcpy(&argp->priv.data, p, sizeof(argp->priv.data)); |
| |
| return true; |
| } |
| |
| bool |
| nlm4svc_decode_shareargs(struct svc_rqst *rqstp, struct xdr_stream *xdr) |
| { |
| 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; |
| |
| if (!svcxdr_decode_cookie(xdr, &argp->cookie)) |
| return false; |
| if (!svcxdr_decode_string(xdr, &lock->caller, &lock->len)) |
| return false; |
| if (!svcxdr_decode_fhandle(xdr, &lock->fh)) |
| return false; |
| if (!svcxdr_decode_owner(xdr, &lock->oh)) |
| return false; |
| /* XXX: Range checks are missing in the original code */ |
| if (xdr_stream_decode_u32(xdr, &argp->fsm_mode) < 0) |
| return false; |
| if (xdr_stream_decode_u32(xdr, &argp->fsm_access) < 0) |
| return false; |
| |
| return true; |
| } |
| |
| bool |
| nlm4svc_decode_notify(struct svc_rqst *rqstp, struct xdr_stream *xdr) |
| { |
| struct nlm_args *argp = rqstp->rq_argp; |
| struct nlm_lock *lock = &argp->lock; |
| |
| if (!svcxdr_decode_string(xdr, &lock->caller, &lock->len)) |
| return false; |
| if (xdr_stream_decode_u32(xdr, &argp->state) < 0) |
| return false; |
| |
| return true; |
| } |
| |
| |
| /* |
| * Encode Reply results |
| */ |
| |
| bool |
| nlm4svc_encode_void(struct svc_rqst *rqstp, struct xdr_stream *xdr) |
| { |
| return true; |
| } |
| |
| bool |
| nlm4svc_encode_testres(struct svc_rqst *rqstp, struct xdr_stream *xdr) |
| { |
| struct nlm_res *resp = rqstp->rq_resp; |
| |
| return svcxdr_encode_cookie(xdr, &resp->cookie) && |
| svcxdr_encode_testrply(xdr, resp); |
| } |
| |
| bool |
| nlm4svc_encode_res(struct svc_rqst *rqstp, struct xdr_stream *xdr) |
| { |
| struct nlm_res *resp = rqstp->rq_resp; |
| |
| return svcxdr_encode_cookie(xdr, &resp->cookie) && |
| svcxdr_encode_stats(xdr, resp->status); |
| } |
| |
| bool |
| nlm4svc_encode_shareres(struct svc_rqst *rqstp, struct xdr_stream *xdr) |
| { |
| struct nlm_res *resp = rqstp->rq_resp; |
| |
| if (!svcxdr_encode_cookie(xdr, &resp->cookie)) |
| return false; |
| if (!svcxdr_encode_stats(xdr, resp->status)) |
| return false; |
| /* sequence */ |
| if (xdr_stream_encode_u32(xdr, 0) < 0) |
| return false; |
| |
| return true; |
| } |
