1 /* 2 * linux/fs/lockd/xdr.c 3 * 4 * XDR support for lockd and the lock client. 5 * 6 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de> 7 */ 8 9 #include <linux/types.h> 10 #include <linux/sched.h> 11 #include <linux/nfs.h> 12 13 #include <linux/sunrpc/xdr.h> 14 #include <linux/sunrpc/clnt.h> 15 #include <linux/sunrpc/svc.h> 16 #include <linux/sunrpc/stats.h> 17 #include <linux/lockd/lockd.h> 18 19 #include <uapi/linux/nfs2.h> 20 21 #define NLMDBG_FACILITY NLMDBG_XDR 22 23 24 static inline loff_t 25 s32_to_loff_t(__s32 offset) 26 { 27 return (loff_t)offset; 28 } 29 30 static inline __s32 31 loff_t_to_s32(loff_t offset) 32 { 33 __s32 res; 34 if (offset >= NLM_OFFSET_MAX) 35 res = NLM_OFFSET_MAX; 36 else if (offset <= -NLM_OFFSET_MAX) 37 res = -NLM_OFFSET_MAX; 38 else 39 res = offset; 40 return res; 41 } 42 43 /* 44 * XDR functions for basic NLM types 45 */ 46 static __be32 *nlm_decode_cookie(__be32 *p, struct nlm_cookie *c) 47 { 48 unsigned int len; 49 50 len = ntohl(*p++); 51 52 if(len==0) 53 { 54 c->len=4; 55 memset(c->data, 0, 4); /* hockeypux brain damage */ 56 } 57 else if(len<=NLM_MAXCOOKIELEN) 58 { 59 c->len=len; 60 memcpy(c->data, p, len); 61 p+=XDR_QUADLEN(len); 62 } 63 else 64 { 65 dprintk("lockd: bad cookie size %d (only cookies under " 66 "%d bytes are supported.)\n", 67 len, NLM_MAXCOOKIELEN); 68 return NULL; 69 } 70 return p; 71 } 72 73 static inline __be32 * 74 nlm_encode_cookie(__be32 *p, struct nlm_cookie *c) 75 { 76 *p++ = htonl(c->len); 77 memcpy(p, c->data, c->len); 78 p+=XDR_QUADLEN(c->len); 79 return p; 80 } 81 82 static __be32 * 83 nlm_decode_fh(__be32 *p, struct nfs_fh *f) 84 { 85 unsigned int len; 86 87 if ((len = ntohl(*p++)) != NFS2_FHSIZE) { 88 dprintk("lockd: bad fhandle size %d (should be %d)\n", 89 len, NFS2_FHSIZE); 90 return NULL; 91 } 92 f->size = NFS2_FHSIZE; 93 memset(f->data, 0, sizeof(f->data)); 94 memcpy(f->data, p, NFS2_FHSIZE); 95 return p + XDR_QUADLEN(NFS2_FHSIZE); 96 } 97 98 /* 99 * Encode and decode owner handle 100 */ 101 static inline __be32 * 102 nlm_decode_oh(__be32 *p, struct xdr_netobj *oh) 103 { 104 return xdr_decode_netobj(p, oh); 105 } 106 107 static inline __be32 * 108 nlm_encode_oh(__be32 *p, struct xdr_netobj *oh) 109 { 110 return xdr_encode_netobj(p, oh); 111 } 112 113 static __be32 * 114 nlm_decode_lock(__be32 *p, struct nlm_lock *lock) 115 { 116 struct file_lock *fl = &lock->fl; 117 s32 start, len, end; 118 119 if (!(p = xdr_decode_string_inplace(p, &lock->caller, 120 &lock->len, 121 NLM_MAXSTRLEN)) 122 || !(p = nlm_decode_fh(p, &lock->fh)) 123 || !(p = nlm_decode_oh(p, &lock->oh))) 124 return NULL; 125 lock->svid = ntohl(*p++); 126 127 locks_init_lock(fl); 128 fl->fl_owner = current->files; 129 fl->fl_pid = (pid_t)lock->svid; 130 fl->fl_flags = FL_POSIX; 131 fl->fl_type = F_RDLCK; /* as good as anything else */ 132 start = ntohl(*p++); 133 len = ntohl(*p++); 134 end = start + len - 1; 135 136 fl->fl_start = s32_to_loff_t(start); 137 138 if (len == 0 || end < 0) 139 fl->fl_end = OFFSET_MAX; 140 else 141 fl->fl_end = s32_to_loff_t(end); 142 return p; 143 } 144 145 /* 146 * Encode result of a TEST/TEST_MSG call 147 */ 148 static __be32 * 149 nlm_encode_testres(__be32 *p, struct nlm_res *resp) 150 { 151 s32 start, len; 152 153 if (!(p = nlm_encode_cookie(p, &resp->cookie))) 154 return NULL; 155 *p++ = resp->status; 156 157 if (resp->status == nlm_lck_denied) { 158 struct file_lock *fl = &resp->lock.fl; 159 160 *p++ = (fl->fl_type == F_RDLCK)? xdr_zero : xdr_one; 161 *p++ = htonl(resp->lock.svid); 162 163 /* Encode owner handle. */ 164 if (!(p = xdr_encode_netobj(p, &resp->lock.oh))) 165 return NULL; 166 167 start = loff_t_to_s32(fl->fl_start); 168 if (fl->fl_end == OFFSET_MAX) 169 len = 0; 170 else 171 len = loff_t_to_s32(fl->fl_end - fl->fl_start + 1); 172 173 *p++ = htonl(start); 174 *p++ = htonl(len); 175 } 176 177 return p; 178 } 179 180 181 /* 182 * First, the server side XDR functions 183 */ 184 int 185 nlmsvc_decode_testargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp) 186 { 187 u32 exclusive; 188 189 if (!(p = nlm_decode_cookie(p, &argp->cookie))) 190 return 0; 191 192 exclusive = ntohl(*p++); 193 if (!(p = nlm_decode_lock(p, &argp->lock))) 194 return 0; 195 if (exclusive) 196 argp->lock.fl.fl_type = F_WRLCK; 197 198 return xdr_argsize_check(rqstp, p); 199 } 200 201 int 202 nlmsvc_encode_testres(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp) 203 { 204 if (!(p = nlm_encode_testres(p, resp))) 205 return 0; 206 return xdr_ressize_check(rqstp, p); 207 } 208 209 int 210 nlmsvc_decode_lockargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp) 211 { 212 u32 exclusive; 213 214 if (!(p = nlm_decode_cookie(p, &argp->cookie))) 215 return 0; 216 argp->block = ntohl(*p++); 217 exclusive = ntohl(*p++); 218 if (!(p = nlm_decode_lock(p, &argp->lock))) 219 return 0; 220 if (exclusive) 221 argp->lock.fl.fl_type = F_WRLCK; 222 argp->reclaim = ntohl(*p++); 223 argp->state = ntohl(*p++); 224 argp->monitor = 1; /* monitor client by default */ 225 226 return xdr_argsize_check(rqstp, p); 227 } 228 229 int 230 nlmsvc_decode_cancargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp) 231 { 232 u32 exclusive; 233 234 if (!(p = nlm_decode_cookie(p, &argp->cookie))) 235 return 0; 236 argp->block = ntohl(*p++); 237 exclusive = ntohl(*p++); 238 if (!(p = nlm_decode_lock(p, &argp->lock))) 239 return 0; 240 if (exclusive) 241 argp->lock.fl.fl_type = F_WRLCK; 242 return xdr_argsize_check(rqstp, p); 243 } 244 245 int 246 nlmsvc_decode_unlockargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp) 247 { 248 if (!(p = nlm_decode_cookie(p, &argp->cookie)) 249 || !(p = nlm_decode_lock(p, &argp->lock))) 250 return 0; 251 argp->lock.fl.fl_type = F_UNLCK; 252 return xdr_argsize_check(rqstp, p); 253 } 254 255 int 256 nlmsvc_decode_shareargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp) 257 { 258 struct nlm_lock *lock = &argp->lock; 259 260 memset(lock, 0, sizeof(*lock)); 261 locks_init_lock(&lock->fl); 262 lock->svid = ~(u32) 0; 263 lock->fl.fl_pid = (pid_t)lock->svid; 264 265 if (!(p = nlm_decode_cookie(p, &argp->cookie)) 266 || !(p = xdr_decode_string_inplace(p, &lock->caller, 267 &lock->len, NLM_MAXSTRLEN)) 268 || !(p = nlm_decode_fh(p, &lock->fh)) 269 || !(p = nlm_decode_oh(p, &lock->oh))) 270 return 0; 271 argp->fsm_mode = ntohl(*p++); 272 argp->fsm_access = ntohl(*p++); 273 return xdr_argsize_check(rqstp, p); 274 } 275 276 int 277 nlmsvc_encode_shareres(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp) 278 { 279 if (!(p = nlm_encode_cookie(p, &resp->cookie))) 280 return 0; 281 *p++ = resp->status; 282 *p++ = xdr_zero; /* sequence argument */ 283 return xdr_ressize_check(rqstp, p); 284 } 285 286 int 287 nlmsvc_encode_res(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp) 288 { 289 if (!(p = nlm_encode_cookie(p, &resp->cookie))) 290 return 0; 291 *p++ = resp->status; 292 return xdr_ressize_check(rqstp, p); 293 } 294 295 int 296 nlmsvc_decode_notify(struct svc_rqst *rqstp, __be32 *p, struct nlm_args *argp) 297 { 298 struct nlm_lock *lock = &argp->lock; 299 300 if (!(p = xdr_decode_string_inplace(p, &lock->caller, 301 &lock->len, NLM_MAXSTRLEN))) 302 return 0; 303 argp->state = ntohl(*p++); 304 return xdr_argsize_check(rqstp, p); 305 } 306 307 int 308 nlmsvc_decode_reboot(struct svc_rqst *rqstp, __be32 *p, struct nlm_reboot *argp) 309 { 310 if (!(p = xdr_decode_string_inplace(p, &argp->mon, &argp->len, SM_MAXSTRLEN))) 311 return 0; 312 argp->state = ntohl(*p++); 313 memcpy(&argp->priv.data, p, sizeof(argp->priv.data)); 314 p += XDR_QUADLEN(SM_PRIV_SIZE); 315 return xdr_argsize_check(rqstp, p); 316 } 317 318 int 319 nlmsvc_decode_res(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp) 320 { 321 if (!(p = nlm_decode_cookie(p, &resp->cookie))) 322 return 0; 323 resp->status = *p++; 324 return xdr_argsize_check(rqstp, p); 325 } 326 327 int 328 nlmsvc_decode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy) 329 { 330 return xdr_argsize_check(rqstp, p); 331 } 332 333 int 334 nlmsvc_encode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy) 335 { 336 return xdr_ressize_check(rqstp, p); 337 } 338