xdr.c
上传用户:lgb322
上传日期:2013-02-24
资源大小:30529k
文件大小:14k
- /*
- * 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/config.h>
- #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
- static inline loff_t
- s32_to_loff_t(__s32 offset)
- {
- return (loff_t)offset;
- }
- static inline __s32
- loff_t_to_s32(loff_t offset)
- {
- __s32 res;
- if (offset >= NLM_OFFSET_MAX)
- res = NLM_OFFSET_MAX;
- else if (offset <= -NLM_OFFSET_MAX)
- res = -NLM_OFFSET_MAX;
- else
- res = offset;
- return res;
- }
- /*
- * XDR functions for basic NLM types
- */
- static inline u32 *nlm_decode_cookie(u32 *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<=8)
- {
- c->len=len;
- memcpy(c->data, p, len);
- p+=(len+3)>>2;
- }
- else
- {
- printk(KERN_NOTICE
- "lockd: bad cookie size %d (only cookies under 8 bytes are supported.)n", len);
- return NULL;
- }
- return p;
- }
- static inline u32 *
- nlm_encode_cookie(u32 *p, struct nlm_cookie *c)
- {
- *p++ = htonl(c->len);
- memcpy(p, c->data, c->len);
- p+=(c->len+3)>>2;
- return p;
- }
- static inline u32 *
- nlm_decode_fh(u32 *p, struct nfs_fh *f)
- {
- unsigned int len;
- if ((len = ntohl(*p++)) != NFS2_FHSIZE) {
- printk(KERN_NOTICE
- "lockd: bad fhandle size %x (should be %d)n",
- len, NFS2_FHSIZE);
- return NULL;
- }
- f->size = NFS2_FHSIZE;
- memset(f->data, 0, sizeof(f->data));
- memcpy(f->data, p, NFS2_FHSIZE);
- return p + XDR_QUADLEN(NFS2_FHSIZE);
- }
- static inline u32 *
- nlm_encode_fh(u32 *p, struct nfs_fh *f)
- {
- *p++ = htonl(NFS2_FHSIZE);
- memcpy(p, f->data, NFS2_FHSIZE);
- return p + XDR_QUADLEN(NFS2_FHSIZE);
- }
- /*
- * 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;
- s32 start, len, end;
- if (!(p = xdr_decode_string_inplace(p, &lock->caller,
- &lock->len,
- NLM_MAXSTRLEN))
- || !(p = nlm_decode_fh(p, &lock->fh))
- || !(p = nlm_decode_oh(p, &lock->oh)))
- return NULL;
- locks_init_lock(fl);
- fl->fl_owner = current->files;
- fl->fl_pid = ntohl(*p++);
- fl->fl_flags = FL_POSIX;
- fl->fl_type = F_RDLCK; /* as good as anything else */
- start = ntohl(*p++);
- len = ntohl(*p++);
- end = start + len - 1;
- fl->fl_start = s32_to_loff_t(start);
- if (len == 0 || end < 0)
- fl->fl_end = OFFSET_MAX;
- else
- fl->fl_end = s32_to_loff_t(end);
- 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;
- __s32 start, len;
- if (!(p = xdr_encode_string(p, lock->caller))
- || !(p = nlm_encode_fh(p, &lock->fh))
- || !(p = nlm_encode_oh(p, &lock->oh)))
- return NULL;
- if (fl->fl_start > NLM_OFFSET_MAX
- || (fl->fl_end > NLM_OFFSET_MAX && fl->fl_end != OFFSET_MAX))
- return NULL;
- start = loff_t_to_s32(fl->fl_start);
- if (fl->fl_end == OFFSET_MAX)
- len = 0;
- else
- len = loff_t_to_s32(fl->fl_end - fl->fl_start + 1);
- *p++ = htonl(fl->fl_pid);
- *p++ = htonl(start);
- *p++ = htonl(len);
- return p;
- }
- /*
- * Encode result of a TEST/TEST_MSG call
- */
- static u32 *
- nlm_encode_testres(u32 *p, struct nlm_res *resp)
- {
- s32 start, len;
- 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;
- start = loff_t_to_s32(fl->fl_start);
- if (fl->fl_end == OFFSET_MAX)
- len = 0;
- else
- len = loff_t_to_s32(fl->fl_end - fl->fl_start + 1);
- *p++ = htonl(start);
- *p++ = htonl(len);
- }
- 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;
- memset(lock, 0, sizeof(*lock));
- locks_init_lock(&lock->fl);
- lock->fl.fl_pid = ~(u32) 0;
- if (!(p = nlm_decode_cookie(p, &argp->cookie))
- || !(p = xdr_decode_string_inplace(p, &lock->caller,
- &lock->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;
- 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
- nlmsvc_decode_reboot(struct svc_rqst *rqstp, u32 *p, struct nlm_reboot *argp)
- {
- if (!(p = xdr_decode_string_inplace(p, &argp->mon, &argp->len, SM_MAXSTRLEN)))
- return 0;
- argp->state = ntohl(*p++);
- /* Preserve the address in network byte order */
- argp->addr = *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;
- s32 start, len, end;
- memset(&resp->lock, 0, sizeof(resp->lock));
- locks_init_lock(fl);
- 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;
- start = ntohl(*p++);
- len = ntohl(*p++);
- end = start + len - 1;
- fl->fl_start = s32_to_loff_t(start);
- if (len == 0 || end < 0)
- fl->fl_end = OFFSET_MAX;
- else
- fl->fl_end = s32_to_loff_t(end);
- }
- 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 3 /* 1 len , 2 data */
- #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(NFS2_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,
- 0
- }
- 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,
- };
- #ifdef CONFIG_LOCKD_V4
- extern struct rpc_version nlm_version4;
- #endif
- static struct rpc_version * nlm_versions[] = {
- NULL,
- &nlm_version1,
- NULL,
- &nlm_version3,
- #ifdef CONFIG_LOCKD_V4
- &nlm_version4,
- #endif
- };
- 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