diff options
Diffstat (limited to 'fs/lockd/xdr.c')
| -rw-r--r-- | fs/lockd/xdr.c | 635 |
1 files changed, 635 insertions, 0 deletions
diff --git a/fs/lockd/xdr.c b/fs/lockd/xdr.c new file mode 100644 index 00000000000..f01e9c0d267 --- /dev/null +++ b/fs/lockd/xdr.c @@ -0,0 +1,635 @@ +/* + * 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<=NLM_MAXCOOKIELEN) + { + c->len=len; + memcpy(c->data, p, len); + p+=XDR_QUADLEN(len); + } + else + { + printk(KERN_NOTICE + "lockd: bad cookie size %d (only cookies under %d bytes are supported.)\n", len, NLM_MAXCOOKIELEN); + 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+=XDR_QUADLEN(c->len); + 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 %d (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 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(fl->fl_pid); + + /* Encode owner handle. */ + if (!(p = xdr_encode_netobj(p, &resp->lock.oh))) + 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(start); + *p++ = htonl(len); + } + + return p; +} + + +/* + * 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++; + argp->vers = *p++; + argp->proto = *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 + */ +#ifdef NLMCLNT_SUPPORT_SHARES +static int +nlmclt_decode_void(struct rpc_rqst *req, u32 *p, void *ptr) +{ + return 0; +} +#endif + +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 1+XDR_QUADLEN(NLM_MAXCOOKIELEN) +#define NLM_caller_sz 1+XDR_QUADLEN(sizeof(system_utsname.nodename)) +#define NLM_netobj_sz 1+XDR_QUADLEN(XDR_MAX_NETOBJ) +/* #define NLM_owner_sz 1+XDR_QUADLEN(NLM_MAXOWNER) */ +#define NLM_fhandle_sz 1+XDR_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) \ +[NLMPROC_##proc] = { \ + .p_proc = NLMPROC_##proc, \ + .p_encode = (kxdrproc_t) nlmclt_encode_##argtype, \ + .p_decode = (kxdrproc_t) nlmclt_decode_##restype, \ + .p_bufsiz = MAX(NLM_##argtype##_sz, NLM_##restype##_sz) << 2 \ + } + +static struct rpc_procinfo nlm_procedures[] = { + PROC(TEST, testargs, testres), + PROC(LOCK, lockargs, res), + PROC(CANCEL, cancargs, res), + PROC(UNLOCK, unlockargs, res), + PROC(GRANTED, testargs, res), + PROC(TEST_MSG, testargs, norep), + PROC(LOCK_MSG, lockargs, norep), + PROC(CANCEL_MSG, cancargs, norep), + PROC(UNLOCK_MSG, unlockargs, norep), + PROC(GRANTED_MSG, testargs, norep), + PROC(TEST_RES, testres, norep), + PROC(LOCK_RES, res, norep), + PROC(CANCEL_RES, res, norep), + PROC(UNLOCK_RES, res, norep), + PROC(GRANTED_RES, res, norep), +#ifdef NLMCLNT_SUPPORT_SHARES + PROC(SHARE, shareargs, shareres), + PROC(UNSHARE, shareargs, shareres), + PROC(NM_LOCK, lockargs, res), + PROC(FREE_ALL, notify, void), +#endif +}; + +static struct rpc_version nlm_version1 = { + .number = 1, + .nrprocs = 16, + .procs = nlm_procedures, +}; + +static struct rpc_version nlm_version3 = { + .number = 3, + .nrprocs = 24, + .procs = nlm_procedures, +}; + +#ifdef CONFIG_LOCKD_V4 +extern struct rpc_version nlm_version4; +#endif + +static struct rpc_version * nlm_versions[] = { + [1] = &nlm_version1, + [3] = &nlm_version3, +#ifdef CONFIG_LOCKD_V4 + [4] = &nlm_version4, +#endif +}; + +static struct rpc_stat nlm_stats; + +struct rpc_program nlm_program = { + .name = "lockd", + .number = NLM_PROGRAM, + .nrvers = sizeof(nlm_versions) / sizeof(nlm_versions[0]), + .version = nlm_versions, + .stats = &nlm_stats, +}; + +#ifdef RPC_DEBUG +const char *nlmdbg_cookie2a(const struct nlm_cookie *cookie) +{ + /* + * We can get away with a static buffer because we're only + * called with BKL held. + */ + static char buf[2*NLM_MAXCOOKIELEN+1]; + int i; + int len = sizeof(buf); + char *p = buf; + + len--; /* allow for trailing \0 */ + if (len < 3) + return "???"; + for (i = 0 ; i < cookie->len ; i++) { + if (len < 2) { + strcpy(p-3, "..."); + break; + } + sprintf(p, "%02x", cookie->data[i]); + p += 2; + len -= 2; + } + *p = '\0'; + + return buf; +} +#endif |