11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * linux/fs/nfs/callback_xdr.c 31da177e4SLinus Torvalds * 41da177e4SLinus Torvalds * Copyright (C) 2004 Trond Myklebust 51da177e4SLinus Torvalds * 61da177e4SLinus Torvalds * NFSv4 callback encode/decode procedures 71da177e4SLinus Torvalds */ 81da177e4SLinus Torvalds #include <linux/kernel.h> 91da177e4SLinus Torvalds #include <linux/sunrpc/svc.h> 101da177e4SLinus Torvalds #include <linux/nfs4.h> 111da177e4SLinus Torvalds #include <linux/nfs_fs.h> 124ce79717STrond Myklebust #include "nfs4_fs.h" 131da177e4SLinus Torvalds #include "callback.h" 141da177e4SLinus Torvalds 151da177e4SLinus Torvalds #define CB_OP_TAGLEN_MAXSZ (512) 161da177e4SLinus Torvalds #define CB_OP_HDR_RES_MAXSZ (2 + CB_OP_TAGLEN_MAXSZ) 171da177e4SLinus Torvalds #define CB_OP_GETATTR_BITMAP_MAXSZ (4) 181da177e4SLinus Torvalds #define CB_OP_GETATTR_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ + \ 191da177e4SLinus Torvalds CB_OP_GETATTR_BITMAP_MAXSZ + \ 201da177e4SLinus Torvalds 2 + 2 + 3 + 3) 211da177e4SLinus Torvalds #define CB_OP_RECALL_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ) 221da177e4SLinus Torvalds 234aece6a1SBenny Halevy #if defined(CONFIG_NFS_V4_1) 244aece6a1SBenny Halevy #define CB_OP_SEQUENCE_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ + \ 254aece6a1SBenny Halevy 4 + 1 + 3) 264aece6a1SBenny Halevy #endif /* CONFIG_NFS_V4_1 */ 274aece6a1SBenny Halevy 281da177e4SLinus Torvalds #define NFSDBG_FACILITY NFSDBG_CALLBACK 291da177e4SLinus Torvalds 30e6f684f6SAl Viro typedef __be32 (*callback_process_op_t)(void *, void *); 31e6f684f6SAl Viro typedef __be32 (*callback_decode_arg_t)(struct svc_rqst *, struct xdr_stream *, void *); 32e6f684f6SAl Viro typedef __be32 (*callback_encode_res_t)(struct svc_rqst *, struct xdr_stream *, void *); 331da177e4SLinus Torvalds 341da177e4SLinus Torvalds 351da177e4SLinus Torvalds struct callback_op { 361da177e4SLinus Torvalds callback_process_op_t process_op; 371da177e4SLinus Torvalds callback_decode_arg_t decode_args; 381da177e4SLinus Torvalds callback_encode_res_t encode_res; 391da177e4SLinus Torvalds long res_maxsize; 401da177e4SLinus Torvalds }; 411da177e4SLinus Torvalds 421da177e4SLinus Torvalds static struct callback_op callback_ops[]; 431da177e4SLinus Torvalds 447111c66eSAl Viro static __be32 nfs4_callback_null(struct svc_rqst *rqstp, void *argp, void *resp) 451da177e4SLinus Torvalds { 461da177e4SLinus Torvalds return htonl(NFS4_OK); 471da177e4SLinus Torvalds } 481da177e4SLinus Torvalds 495704fdebSAl Viro static int nfs4_decode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy) 501da177e4SLinus Torvalds { 511da177e4SLinus Torvalds return xdr_argsize_check(rqstp, p); 521da177e4SLinus Torvalds } 531da177e4SLinus Torvalds 545704fdebSAl Viro static int nfs4_encode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy) 551da177e4SLinus Torvalds { 561da177e4SLinus Torvalds return xdr_ressize_check(rqstp, p); 571da177e4SLinus Torvalds } 581da177e4SLinus Torvalds 595704fdebSAl Viro static __be32 *read_buf(struct xdr_stream *xdr, int nbytes) 601da177e4SLinus Torvalds { 615704fdebSAl Viro __be32 *p; 621da177e4SLinus Torvalds 631da177e4SLinus Torvalds p = xdr_inline_decode(xdr, nbytes); 641da177e4SLinus Torvalds if (unlikely(p == NULL)) 651da177e4SLinus Torvalds printk(KERN_WARNING "NFSv4 callback reply buffer overflowed!\n"); 661da177e4SLinus Torvalds return p; 671da177e4SLinus Torvalds } 681da177e4SLinus Torvalds 69e6f684f6SAl Viro static __be32 decode_string(struct xdr_stream *xdr, unsigned int *len, const char **str) 701da177e4SLinus Torvalds { 715704fdebSAl Viro __be32 *p; 721da177e4SLinus Torvalds 731da177e4SLinus Torvalds p = read_buf(xdr, 4); 741da177e4SLinus Torvalds if (unlikely(p == NULL)) 751da177e4SLinus Torvalds return htonl(NFS4ERR_RESOURCE); 761da177e4SLinus Torvalds *len = ntohl(*p); 771da177e4SLinus Torvalds 781da177e4SLinus Torvalds if (*len != 0) { 791da177e4SLinus Torvalds p = read_buf(xdr, *len); 801da177e4SLinus Torvalds if (unlikely(p == NULL)) 811da177e4SLinus Torvalds return htonl(NFS4ERR_RESOURCE); 821da177e4SLinus Torvalds *str = (const char *)p; 831da177e4SLinus Torvalds } else 841da177e4SLinus Torvalds *str = NULL; 851da177e4SLinus Torvalds 861da177e4SLinus Torvalds return 0; 871da177e4SLinus Torvalds } 881da177e4SLinus Torvalds 89e6f684f6SAl Viro static __be32 decode_fh(struct xdr_stream *xdr, struct nfs_fh *fh) 901da177e4SLinus Torvalds { 915704fdebSAl Viro __be32 *p; 921da177e4SLinus Torvalds 931da177e4SLinus Torvalds p = read_buf(xdr, 4); 941da177e4SLinus Torvalds if (unlikely(p == NULL)) 951da177e4SLinus Torvalds return htonl(NFS4ERR_RESOURCE); 961da177e4SLinus Torvalds fh->size = ntohl(*p); 971da177e4SLinus Torvalds if (fh->size > NFS4_FHSIZE) 981da177e4SLinus Torvalds return htonl(NFS4ERR_BADHANDLE); 991da177e4SLinus Torvalds p = read_buf(xdr, fh->size); 1001da177e4SLinus Torvalds if (unlikely(p == NULL)) 1011da177e4SLinus Torvalds return htonl(NFS4ERR_RESOURCE); 1021da177e4SLinus Torvalds memcpy(&fh->data[0], p, fh->size); 1031da177e4SLinus Torvalds memset(&fh->data[fh->size], 0, sizeof(fh->data) - fh->size); 1041da177e4SLinus Torvalds return 0; 1051da177e4SLinus Torvalds } 1061da177e4SLinus Torvalds 107e6f684f6SAl Viro static __be32 decode_bitmap(struct xdr_stream *xdr, uint32_t *bitmap) 1081da177e4SLinus Torvalds { 1095704fdebSAl Viro __be32 *p; 1101da177e4SLinus Torvalds unsigned int attrlen; 1111da177e4SLinus Torvalds 1121da177e4SLinus Torvalds p = read_buf(xdr, 4); 1131da177e4SLinus Torvalds if (unlikely(p == NULL)) 1141da177e4SLinus Torvalds return htonl(NFS4ERR_RESOURCE); 1151da177e4SLinus Torvalds attrlen = ntohl(*p); 1161da177e4SLinus Torvalds p = read_buf(xdr, attrlen << 2); 1171da177e4SLinus Torvalds if (unlikely(p == NULL)) 1181da177e4SLinus Torvalds return htonl(NFS4ERR_RESOURCE); 1191da177e4SLinus Torvalds if (likely(attrlen > 0)) 1201da177e4SLinus Torvalds bitmap[0] = ntohl(*p++); 1211da177e4SLinus Torvalds if (attrlen > 1) 1221da177e4SLinus Torvalds bitmap[1] = ntohl(*p); 1231da177e4SLinus Torvalds return 0; 1241da177e4SLinus Torvalds } 1251da177e4SLinus Torvalds 126e6f684f6SAl Viro static __be32 decode_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid) 1271da177e4SLinus Torvalds { 1285704fdebSAl Viro __be32 *p; 1291da177e4SLinus Torvalds 1301da177e4SLinus Torvalds p = read_buf(xdr, 16); 1311da177e4SLinus Torvalds if (unlikely(p == NULL)) 1321da177e4SLinus Torvalds return htonl(NFS4ERR_RESOURCE); 1331da177e4SLinus Torvalds memcpy(stateid->data, p, 16); 1341da177e4SLinus Torvalds return 0; 1351da177e4SLinus Torvalds } 1361da177e4SLinus Torvalds 137e6f684f6SAl Viro static __be32 decode_compound_hdr_arg(struct xdr_stream *xdr, struct cb_compound_hdr_arg *hdr) 1381da177e4SLinus Torvalds { 1395704fdebSAl Viro __be32 *p; 140e6f684f6SAl Viro __be32 status; 1411da177e4SLinus Torvalds 1421da177e4SLinus Torvalds status = decode_string(xdr, &hdr->taglen, &hdr->tag); 1431da177e4SLinus Torvalds if (unlikely(status != 0)) 1441da177e4SLinus Torvalds return status; 1451da177e4SLinus Torvalds /* We do not like overly long tags! */ 1465cce428dSChuck Lever if (hdr->taglen > CB_OP_TAGLEN_MAXSZ - 12) { 1471da177e4SLinus Torvalds printk("NFSv4 CALLBACK %s: client sent tag of length %u\n", 1483110ff80SHarvey Harrison __func__, hdr->taglen); 1491da177e4SLinus Torvalds return htonl(NFS4ERR_RESOURCE); 1501da177e4SLinus Torvalds } 1511da177e4SLinus Torvalds p = read_buf(xdr, 12); 1521da177e4SLinus Torvalds if (unlikely(p == NULL)) 1531da177e4SLinus Torvalds return htonl(NFS4ERR_RESOURCE); 154b8f2ef84SBenny Halevy hdr->minorversion = ntohl(*p++); 15548a9e2d2SBenny Halevy /* Check minor version is zero or one. */ 15648a9e2d2SBenny Halevy if (hdr->minorversion <= 1) { 15748a9e2d2SBenny Halevy p++; /* skip callback_ident */ 15848a9e2d2SBenny Halevy } else { 159b8f2ef84SBenny Halevy printk(KERN_WARNING "%s: NFSv4 server callback with " 160b8f2ef84SBenny Halevy "illegal minor version %u!\n", 161b8f2ef84SBenny Halevy __func__, hdr->minorversion); 1621da177e4SLinus Torvalds return htonl(NFS4ERR_MINOR_VERS_MISMATCH); 1631da177e4SLinus Torvalds } 1641da177e4SLinus Torvalds hdr->nops = ntohl(*p); 165b8f2ef84SBenny Halevy dprintk("%s: minorversion %d nops %d\n", __func__, 166b8f2ef84SBenny Halevy hdr->minorversion, hdr->nops); 1671da177e4SLinus Torvalds return 0; 1681da177e4SLinus Torvalds } 1691da177e4SLinus Torvalds 170e6f684f6SAl Viro static __be32 decode_op_hdr(struct xdr_stream *xdr, unsigned int *op) 1711da177e4SLinus Torvalds { 1725704fdebSAl Viro __be32 *p; 1731da177e4SLinus Torvalds p = read_buf(xdr, 4); 1741da177e4SLinus Torvalds if (unlikely(p == NULL)) 1751da177e4SLinus Torvalds return htonl(NFS4ERR_RESOURCE); 1761da177e4SLinus Torvalds *op = ntohl(*p); 1771da177e4SLinus Torvalds return 0; 1781da177e4SLinus Torvalds } 1791da177e4SLinus Torvalds 180e6f684f6SAl Viro static __be32 decode_getattr_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_getattrargs *args) 1811da177e4SLinus Torvalds { 182e6f684f6SAl Viro __be32 status; 1831da177e4SLinus Torvalds 1841da177e4SLinus Torvalds status = decode_fh(xdr, &args->fh); 1851da177e4SLinus Torvalds if (unlikely(status != 0)) 1861da177e4SLinus Torvalds goto out; 187671beed7SChuck Lever args->addr = svc_addr(rqstp); 1881da177e4SLinus Torvalds status = decode_bitmap(xdr, args->bitmap); 1891da177e4SLinus Torvalds out: 1903110ff80SHarvey Harrison dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); 1911da177e4SLinus Torvalds return status; 1921da177e4SLinus Torvalds } 1931da177e4SLinus Torvalds 194e6f684f6SAl Viro static __be32 decode_recall_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_recallargs *args) 1951da177e4SLinus Torvalds { 1965704fdebSAl Viro __be32 *p; 197e6f684f6SAl Viro __be32 status; 1981da177e4SLinus Torvalds 199c1d35866SChuck Lever args->addr = svc_addr(rqstp); 2001da177e4SLinus Torvalds status = decode_stateid(xdr, &args->stateid); 2011da177e4SLinus Torvalds if (unlikely(status != 0)) 2021da177e4SLinus Torvalds goto out; 2031da177e4SLinus Torvalds p = read_buf(xdr, 4); 2041da177e4SLinus Torvalds if (unlikely(p == NULL)) { 2051da177e4SLinus Torvalds status = htonl(NFS4ERR_RESOURCE); 2061da177e4SLinus Torvalds goto out; 2071da177e4SLinus Torvalds } 2081da177e4SLinus Torvalds args->truncate = ntohl(*p); 2091da177e4SLinus Torvalds status = decode_fh(xdr, &args->fh); 2101da177e4SLinus Torvalds out: 2113110ff80SHarvey Harrison dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); 2123873bc50SAlexey Dobriyan return status; 2131da177e4SLinus Torvalds } 2141da177e4SLinus Torvalds 2154aece6a1SBenny Halevy #if defined(CONFIG_NFS_V4_1) 2164aece6a1SBenny Halevy 2174aece6a1SBenny Halevy static unsigned decode_sessionid(struct xdr_stream *xdr, 2184aece6a1SBenny Halevy struct nfs4_sessionid *sid) 2194aece6a1SBenny Halevy { 2204aece6a1SBenny Halevy uint32_t *p; 2214aece6a1SBenny Halevy int len = NFS4_MAX_SESSIONID_LEN; 2224aece6a1SBenny Halevy 2234aece6a1SBenny Halevy p = read_buf(xdr, len); 2244aece6a1SBenny Halevy if (unlikely(p == NULL)) 2254aece6a1SBenny Halevy return htonl(NFS4ERR_RESOURCE);; 2264aece6a1SBenny Halevy 2274aece6a1SBenny Halevy memcpy(sid->data, p, len); 2284aece6a1SBenny Halevy return 0; 2294aece6a1SBenny Halevy } 2304aece6a1SBenny Halevy 2314aece6a1SBenny Halevy static unsigned decode_rc_list(struct xdr_stream *xdr, 2324aece6a1SBenny Halevy struct referring_call_list *rc_list) 2334aece6a1SBenny Halevy { 2344aece6a1SBenny Halevy uint32_t *p; 2354aece6a1SBenny Halevy int i; 2364aece6a1SBenny Halevy unsigned status; 2374aece6a1SBenny Halevy 2384aece6a1SBenny Halevy status = decode_sessionid(xdr, &rc_list->rcl_sessionid); 2394aece6a1SBenny Halevy if (status) 2404aece6a1SBenny Halevy goto out; 2414aece6a1SBenny Halevy 2424aece6a1SBenny Halevy status = htonl(NFS4ERR_RESOURCE); 2434aece6a1SBenny Halevy p = read_buf(xdr, sizeof(uint32_t)); 2444aece6a1SBenny Halevy if (unlikely(p == NULL)) 2454aece6a1SBenny Halevy goto out; 2464aece6a1SBenny Halevy 2474aece6a1SBenny Halevy rc_list->rcl_nrefcalls = ntohl(*p++); 2484aece6a1SBenny Halevy if (rc_list->rcl_nrefcalls) { 2494aece6a1SBenny Halevy p = read_buf(xdr, 2504aece6a1SBenny Halevy rc_list->rcl_nrefcalls * 2 * sizeof(uint32_t)); 2514aece6a1SBenny Halevy if (unlikely(p == NULL)) 2524aece6a1SBenny Halevy goto out; 2534aece6a1SBenny Halevy rc_list->rcl_refcalls = kmalloc(rc_list->rcl_nrefcalls * 2544aece6a1SBenny Halevy sizeof(*rc_list->rcl_refcalls), 2554aece6a1SBenny Halevy GFP_KERNEL); 2564aece6a1SBenny Halevy if (unlikely(rc_list->rcl_refcalls == NULL)) 2574aece6a1SBenny Halevy goto out; 2584aece6a1SBenny Halevy for (i = 0; i < rc_list->rcl_nrefcalls; i++) { 2594aece6a1SBenny Halevy rc_list->rcl_refcalls[i].rc_sequenceid = ntohl(*p++); 2604aece6a1SBenny Halevy rc_list->rcl_refcalls[i].rc_slotid = ntohl(*p++); 2614aece6a1SBenny Halevy } 2624aece6a1SBenny Halevy } 2634aece6a1SBenny Halevy status = 0; 2644aece6a1SBenny Halevy 2654aece6a1SBenny Halevy out: 2664aece6a1SBenny Halevy return status; 2674aece6a1SBenny Halevy } 2684aece6a1SBenny Halevy 2694aece6a1SBenny Halevy static unsigned decode_cb_sequence_args(struct svc_rqst *rqstp, 2704aece6a1SBenny Halevy struct xdr_stream *xdr, 2714aece6a1SBenny Halevy struct cb_sequenceargs *args) 2724aece6a1SBenny Halevy { 2734aece6a1SBenny Halevy uint32_t *p; 2744aece6a1SBenny Halevy int i; 2754aece6a1SBenny Halevy unsigned status; 2764aece6a1SBenny Halevy 2774aece6a1SBenny Halevy status = decode_sessionid(xdr, &args->csa_sessionid); 2784aece6a1SBenny Halevy if (status) 2794aece6a1SBenny Halevy goto out; 2804aece6a1SBenny Halevy 2814aece6a1SBenny Halevy status = htonl(NFS4ERR_RESOURCE); 2824aece6a1SBenny Halevy p = read_buf(xdr, 5 * sizeof(uint32_t)); 2834aece6a1SBenny Halevy if (unlikely(p == NULL)) 2844aece6a1SBenny Halevy goto out; 2854aece6a1SBenny Halevy 2864aece6a1SBenny Halevy args->csa_addr = svc_addr_in(rqstp); 2874aece6a1SBenny Halevy args->csa_sequenceid = ntohl(*p++); 2884aece6a1SBenny Halevy args->csa_slotid = ntohl(*p++); 2894aece6a1SBenny Halevy args->csa_highestslotid = ntohl(*p++); 2904aece6a1SBenny Halevy args->csa_cachethis = ntohl(*p++); 2914aece6a1SBenny Halevy args->csa_nrclists = ntohl(*p++); 2924aece6a1SBenny Halevy args->csa_rclists = NULL; 2934aece6a1SBenny Halevy if (args->csa_nrclists) { 2944aece6a1SBenny Halevy args->csa_rclists = kmalloc(args->csa_nrclists * 2954aece6a1SBenny Halevy sizeof(*args->csa_rclists), 2964aece6a1SBenny Halevy GFP_KERNEL); 2974aece6a1SBenny Halevy if (unlikely(args->csa_rclists == NULL)) 2984aece6a1SBenny Halevy goto out; 2994aece6a1SBenny Halevy 3004aece6a1SBenny Halevy for (i = 0; i < args->csa_nrclists; i++) { 3014aece6a1SBenny Halevy status = decode_rc_list(xdr, &args->csa_rclists[i]); 3024aece6a1SBenny Halevy if (status) 3034aece6a1SBenny Halevy goto out_free; 3044aece6a1SBenny Halevy } 3054aece6a1SBenny Halevy } 3064aece6a1SBenny Halevy status = 0; 3074aece6a1SBenny Halevy 3084aece6a1SBenny Halevy dprintk("%s: sessionid %x:%x:%x:%x sequenceid %u slotid %u " 3094aece6a1SBenny Halevy "highestslotid %u cachethis %d nrclists %u\n", 3104aece6a1SBenny Halevy __func__, 3114aece6a1SBenny Halevy ((u32 *)&args->csa_sessionid)[0], 3124aece6a1SBenny Halevy ((u32 *)&args->csa_sessionid)[1], 3134aece6a1SBenny Halevy ((u32 *)&args->csa_sessionid)[2], 3144aece6a1SBenny Halevy ((u32 *)&args->csa_sessionid)[3], 3154aece6a1SBenny Halevy args->csa_sequenceid, args->csa_slotid, 3164aece6a1SBenny Halevy args->csa_highestslotid, args->csa_cachethis, 3174aece6a1SBenny Halevy args->csa_nrclists); 3184aece6a1SBenny Halevy out: 3194aece6a1SBenny Halevy dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); 3204aece6a1SBenny Halevy return status; 3214aece6a1SBenny Halevy 3224aece6a1SBenny Halevy out_free: 3234aece6a1SBenny Halevy for (i = 0; i < args->csa_nrclists; i++) 3244aece6a1SBenny Halevy kfree(args->csa_rclists[i].rcl_refcalls); 3254aece6a1SBenny Halevy kfree(args->csa_rclists); 3264aece6a1SBenny Halevy goto out; 3274aece6a1SBenny Halevy } 3284aece6a1SBenny Halevy 3294aece6a1SBenny Halevy #endif /* CONFIG_NFS_V4_1 */ 3304aece6a1SBenny Halevy 331e6f684f6SAl Viro static __be32 encode_string(struct xdr_stream *xdr, unsigned int len, const char *str) 3321da177e4SLinus Torvalds { 3335704fdebSAl Viro __be32 *p; 3341da177e4SLinus Torvalds 3351da177e4SLinus Torvalds p = xdr_reserve_space(xdr, 4 + len); 3361da177e4SLinus Torvalds if (unlikely(p == NULL)) 3371da177e4SLinus Torvalds return htonl(NFS4ERR_RESOURCE); 3381da177e4SLinus Torvalds xdr_encode_opaque(p, str, len); 3391da177e4SLinus Torvalds return 0; 3401da177e4SLinus Torvalds } 3411da177e4SLinus Torvalds 3421da177e4SLinus Torvalds #define CB_SUPPORTED_ATTR0 (FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE) 3431da177e4SLinus Torvalds #define CB_SUPPORTED_ATTR1 (FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY) 3445704fdebSAl Viro static __be32 encode_attr_bitmap(struct xdr_stream *xdr, const uint32_t *bitmap, __be32 **savep) 3451da177e4SLinus Torvalds { 3465704fdebSAl Viro __be32 bm[2]; 3475704fdebSAl Viro __be32 *p; 3481da177e4SLinus Torvalds 3491da177e4SLinus Torvalds bm[0] = htonl(bitmap[0] & CB_SUPPORTED_ATTR0); 3501da177e4SLinus Torvalds bm[1] = htonl(bitmap[1] & CB_SUPPORTED_ATTR1); 3511da177e4SLinus Torvalds if (bm[1] != 0) { 3521da177e4SLinus Torvalds p = xdr_reserve_space(xdr, 16); 3531da177e4SLinus Torvalds if (unlikely(p == NULL)) 3541da177e4SLinus Torvalds return htonl(NFS4ERR_RESOURCE); 3551da177e4SLinus Torvalds *p++ = htonl(2); 3561da177e4SLinus Torvalds *p++ = bm[0]; 3571da177e4SLinus Torvalds *p++ = bm[1]; 3581da177e4SLinus Torvalds } else if (bm[0] != 0) { 3591da177e4SLinus Torvalds p = xdr_reserve_space(xdr, 12); 3601da177e4SLinus Torvalds if (unlikely(p == NULL)) 3611da177e4SLinus Torvalds return htonl(NFS4ERR_RESOURCE); 3621da177e4SLinus Torvalds *p++ = htonl(1); 3631da177e4SLinus Torvalds *p++ = bm[0]; 3641da177e4SLinus Torvalds } else { 3651da177e4SLinus Torvalds p = xdr_reserve_space(xdr, 8); 3661da177e4SLinus Torvalds if (unlikely(p == NULL)) 3671da177e4SLinus Torvalds return htonl(NFS4ERR_RESOURCE); 3681da177e4SLinus Torvalds *p++ = htonl(0); 3691da177e4SLinus Torvalds } 3701da177e4SLinus Torvalds *savep = p; 3711da177e4SLinus Torvalds return 0; 3721da177e4SLinus Torvalds } 3731da177e4SLinus Torvalds 374e6f684f6SAl Viro static __be32 encode_attr_change(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t change) 3751da177e4SLinus Torvalds { 3765704fdebSAl Viro __be32 *p; 3771da177e4SLinus Torvalds 3781da177e4SLinus Torvalds if (!(bitmap[0] & FATTR4_WORD0_CHANGE)) 3791da177e4SLinus Torvalds return 0; 3801da177e4SLinus Torvalds p = xdr_reserve_space(xdr, 8); 38190dc7d27SHarvey Harrison if (unlikely(!p)) 3821da177e4SLinus Torvalds return htonl(NFS4ERR_RESOURCE); 3831da177e4SLinus Torvalds p = xdr_encode_hyper(p, change); 3841da177e4SLinus Torvalds return 0; 3851da177e4SLinus Torvalds } 3861da177e4SLinus Torvalds 387e6f684f6SAl Viro static __be32 encode_attr_size(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t size) 3881da177e4SLinus Torvalds { 3895704fdebSAl Viro __be32 *p; 3901da177e4SLinus Torvalds 3911da177e4SLinus Torvalds if (!(bitmap[0] & FATTR4_WORD0_SIZE)) 3921da177e4SLinus Torvalds return 0; 3931da177e4SLinus Torvalds p = xdr_reserve_space(xdr, 8); 39490dc7d27SHarvey Harrison if (unlikely(!p)) 3951da177e4SLinus Torvalds return htonl(NFS4ERR_RESOURCE); 3961da177e4SLinus Torvalds p = xdr_encode_hyper(p, size); 3971da177e4SLinus Torvalds return 0; 3981da177e4SLinus Torvalds } 3991da177e4SLinus Torvalds 400e6f684f6SAl Viro static __be32 encode_attr_time(struct xdr_stream *xdr, const struct timespec *time) 4011da177e4SLinus Torvalds { 4025704fdebSAl Viro __be32 *p; 4031da177e4SLinus Torvalds 4041da177e4SLinus Torvalds p = xdr_reserve_space(xdr, 12); 40590dc7d27SHarvey Harrison if (unlikely(!p)) 4061da177e4SLinus Torvalds return htonl(NFS4ERR_RESOURCE); 4071da177e4SLinus Torvalds p = xdr_encode_hyper(p, time->tv_sec); 4081da177e4SLinus Torvalds *p = htonl(time->tv_nsec); 4091da177e4SLinus Torvalds return 0; 4101da177e4SLinus Torvalds } 4111da177e4SLinus Torvalds 412e6f684f6SAl Viro static __be32 encode_attr_ctime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time) 4131da177e4SLinus Torvalds { 4141da177e4SLinus Torvalds if (!(bitmap[1] & FATTR4_WORD1_TIME_METADATA)) 4151da177e4SLinus Torvalds return 0; 4161da177e4SLinus Torvalds return encode_attr_time(xdr,time); 4171da177e4SLinus Torvalds } 4181da177e4SLinus Torvalds 419e6f684f6SAl Viro static __be32 encode_attr_mtime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time) 4201da177e4SLinus Torvalds { 4211da177e4SLinus Torvalds if (!(bitmap[1] & FATTR4_WORD1_TIME_MODIFY)) 4221da177e4SLinus Torvalds return 0; 4231da177e4SLinus Torvalds return encode_attr_time(xdr,time); 4241da177e4SLinus Torvalds } 4251da177e4SLinus Torvalds 426e6f684f6SAl Viro static __be32 encode_compound_hdr_res(struct xdr_stream *xdr, struct cb_compound_hdr_res *hdr) 4271da177e4SLinus Torvalds { 428e6f684f6SAl Viro __be32 status; 4291da177e4SLinus Torvalds 4301da177e4SLinus Torvalds hdr->status = xdr_reserve_space(xdr, 4); 4311da177e4SLinus Torvalds if (unlikely(hdr->status == NULL)) 4321da177e4SLinus Torvalds return htonl(NFS4ERR_RESOURCE); 4331da177e4SLinus Torvalds status = encode_string(xdr, hdr->taglen, hdr->tag); 4341da177e4SLinus Torvalds if (unlikely(status != 0)) 4351da177e4SLinus Torvalds return status; 4361da177e4SLinus Torvalds hdr->nops = xdr_reserve_space(xdr, 4); 4371da177e4SLinus Torvalds if (unlikely(hdr->nops == NULL)) 4381da177e4SLinus Torvalds return htonl(NFS4ERR_RESOURCE); 4391da177e4SLinus Torvalds return 0; 4401da177e4SLinus Torvalds } 4411da177e4SLinus Torvalds 442e6f684f6SAl Viro static __be32 encode_op_hdr(struct xdr_stream *xdr, uint32_t op, __be32 res) 4431da177e4SLinus Torvalds { 4445704fdebSAl Viro __be32 *p; 4451da177e4SLinus Torvalds 4461da177e4SLinus Torvalds p = xdr_reserve_space(xdr, 8); 4471da177e4SLinus Torvalds if (unlikely(p == NULL)) 4481da177e4SLinus Torvalds return htonl(NFS4ERR_RESOURCE); 4491da177e4SLinus Torvalds *p++ = htonl(op); 4501da177e4SLinus Torvalds *p = res; 4511da177e4SLinus Torvalds return 0; 4521da177e4SLinus Torvalds } 4531da177e4SLinus Torvalds 454e6f684f6SAl Viro static __be32 encode_getattr_res(struct svc_rqst *rqstp, struct xdr_stream *xdr, const struct cb_getattrres *res) 4551da177e4SLinus Torvalds { 4565704fdebSAl Viro __be32 *savep = NULL; 457e6f684f6SAl Viro __be32 status = res->status; 4581da177e4SLinus Torvalds 4591da177e4SLinus Torvalds if (unlikely(status != 0)) 4601da177e4SLinus Torvalds goto out; 4611da177e4SLinus Torvalds status = encode_attr_bitmap(xdr, res->bitmap, &savep); 4621da177e4SLinus Torvalds if (unlikely(status != 0)) 4631da177e4SLinus Torvalds goto out; 4641da177e4SLinus Torvalds status = encode_attr_change(xdr, res->bitmap, res->change_attr); 4651da177e4SLinus Torvalds if (unlikely(status != 0)) 4661da177e4SLinus Torvalds goto out; 4671da177e4SLinus Torvalds status = encode_attr_size(xdr, res->bitmap, res->size); 4681da177e4SLinus Torvalds if (unlikely(status != 0)) 4691da177e4SLinus Torvalds goto out; 4701da177e4SLinus Torvalds status = encode_attr_ctime(xdr, res->bitmap, &res->ctime); 4711da177e4SLinus Torvalds if (unlikely(status != 0)) 4721da177e4SLinus Torvalds goto out; 4731da177e4SLinus Torvalds status = encode_attr_mtime(xdr, res->bitmap, &res->mtime); 4741da177e4SLinus Torvalds *savep = htonl((unsigned int)((char *)xdr->p - (char *)(savep+1))); 4751da177e4SLinus Torvalds out: 4763110ff80SHarvey Harrison dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); 4771da177e4SLinus Torvalds return status; 4781da177e4SLinus Torvalds } 4791da177e4SLinus Torvalds 48034bc47c9SBenny Halevy #if defined(CONFIG_NFS_V4_1) 48134bc47c9SBenny Halevy 4824aece6a1SBenny Halevy static unsigned encode_sessionid(struct xdr_stream *xdr, 4834aece6a1SBenny Halevy const struct nfs4_sessionid *sid) 4844aece6a1SBenny Halevy { 4854aece6a1SBenny Halevy uint32_t *p; 4864aece6a1SBenny Halevy int len = NFS4_MAX_SESSIONID_LEN; 4874aece6a1SBenny Halevy 4884aece6a1SBenny Halevy p = xdr_reserve_space(xdr, len); 4894aece6a1SBenny Halevy if (unlikely(p == NULL)) 4904aece6a1SBenny Halevy return htonl(NFS4ERR_RESOURCE); 4914aece6a1SBenny Halevy 4924aece6a1SBenny Halevy memcpy(p, sid, len); 4934aece6a1SBenny Halevy return 0; 4944aece6a1SBenny Halevy } 4954aece6a1SBenny Halevy 4964aece6a1SBenny Halevy static unsigned encode_cb_sequence_res(struct svc_rqst *rqstp, 4974aece6a1SBenny Halevy struct xdr_stream *xdr, 4984aece6a1SBenny Halevy const struct cb_sequenceres *res) 4994aece6a1SBenny Halevy { 5004aece6a1SBenny Halevy uint32_t *p; 5014aece6a1SBenny Halevy unsigned status = res->csr_status; 5024aece6a1SBenny Halevy 5034aece6a1SBenny Halevy if (unlikely(status != 0)) 5044aece6a1SBenny Halevy goto out; 5054aece6a1SBenny Halevy 5064aece6a1SBenny Halevy encode_sessionid(xdr, &res->csr_sessionid); 5074aece6a1SBenny Halevy 5084aece6a1SBenny Halevy p = xdr_reserve_space(xdr, 4 * sizeof(uint32_t)); 5094aece6a1SBenny Halevy if (unlikely(p == NULL)) 5104aece6a1SBenny Halevy return htonl(NFS4ERR_RESOURCE); 5114aece6a1SBenny Halevy 5124aece6a1SBenny Halevy *p++ = htonl(res->csr_sequenceid); 5134aece6a1SBenny Halevy *p++ = htonl(res->csr_slotid); 5144aece6a1SBenny Halevy *p++ = htonl(res->csr_highestslotid); 5154aece6a1SBenny Halevy *p++ = htonl(res->csr_target_highestslotid); 5164aece6a1SBenny Halevy out: 5174aece6a1SBenny Halevy dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); 5184aece6a1SBenny Halevy return status; 5194aece6a1SBenny Halevy } 5204aece6a1SBenny Halevy 52134bc47c9SBenny Halevy static __be32 52234bc47c9SBenny Halevy preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op) 52334bc47c9SBenny Halevy { 52434bc47c9SBenny Halevy switch (op_nr) { 52534bc47c9SBenny Halevy case OP_CB_GETATTR: 52634bc47c9SBenny Halevy case OP_CB_RECALL: 5274aece6a1SBenny Halevy case OP_CB_SEQUENCE: 52834bc47c9SBenny Halevy *op = &callback_ops[op_nr]; 52934bc47c9SBenny Halevy break; 53034bc47c9SBenny Halevy 53134bc47c9SBenny Halevy case OP_CB_LAYOUTRECALL: 53234bc47c9SBenny Halevy case OP_CB_NOTIFY_DEVICEID: 53334bc47c9SBenny Halevy case OP_CB_NOTIFY: 53434bc47c9SBenny Halevy case OP_CB_PUSH_DELEG: 53534bc47c9SBenny Halevy case OP_CB_RECALL_ANY: 53634bc47c9SBenny Halevy case OP_CB_RECALLABLE_OBJ_AVAIL: 53734bc47c9SBenny Halevy case OP_CB_RECALL_SLOT: 53834bc47c9SBenny Halevy case OP_CB_WANTS_CANCELLED: 53934bc47c9SBenny Halevy case OP_CB_NOTIFY_LOCK: 54034bc47c9SBenny Halevy return htonl(NFS4ERR_NOTSUPP); 54134bc47c9SBenny Halevy 54234bc47c9SBenny Halevy default: 54334bc47c9SBenny Halevy return htonl(NFS4ERR_OP_ILLEGAL); 54434bc47c9SBenny Halevy } 54534bc47c9SBenny Halevy 54634bc47c9SBenny Halevy return htonl(NFS_OK); 54734bc47c9SBenny Halevy } 54834bc47c9SBenny Halevy 54934bc47c9SBenny Halevy #else /* CONFIG_NFS_V4_1 */ 55034bc47c9SBenny Halevy 55134bc47c9SBenny Halevy static __be32 55234bc47c9SBenny Halevy preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op) 55334bc47c9SBenny Halevy { 55434bc47c9SBenny Halevy return htonl(NFS4ERR_MINOR_VERS_MISMATCH); 55534bc47c9SBenny Halevy } 55634bc47c9SBenny Halevy 55734bc47c9SBenny Halevy #endif /* CONFIG_NFS_V4_1 */ 55834bc47c9SBenny Halevy 55934bc47c9SBenny Halevy static __be32 56034bc47c9SBenny Halevy preprocess_nfs4_op(unsigned int op_nr, struct callback_op **op) 56134bc47c9SBenny Halevy { 56234bc47c9SBenny Halevy switch (op_nr) { 56334bc47c9SBenny Halevy case OP_CB_GETATTR: 56434bc47c9SBenny Halevy case OP_CB_RECALL: 56534bc47c9SBenny Halevy *op = &callback_ops[op_nr]; 56634bc47c9SBenny Halevy break; 56734bc47c9SBenny Halevy default: 56834bc47c9SBenny Halevy return htonl(NFS4ERR_OP_ILLEGAL); 56934bc47c9SBenny Halevy } 57034bc47c9SBenny Halevy 57134bc47c9SBenny Halevy return htonl(NFS_OK); 57234bc47c9SBenny Halevy } 57334bc47c9SBenny Halevy 57434bc47c9SBenny Halevy static __be32 process_op(uint32_t minorversion, int nop, 57534bc47c9SBenny Halevy struct svc_rqst *rqstp, 5761da177e4SLinus Torvalds struct xdr_stream *xdr_in, void *argp, 5771da177e4SLinus Torvalds struct xdr_stream *xdr_out, void *resp) 5781da177e4SLinus Torvalds { 579a162a6b8STrond Myklebust struct callback_op *op = &callback_ops[0]; 580a162a6b8STrond Myklebust unsigned int op_nr = OP_CB_ILLEGAL; 58134bc47c9SBenny Halevy __be32 status; 5821da177e4SLinus Torvalds long maxlen; 583e6f684f6SAl Viro __be32 res; 5841da177e4SLinus Torvalds 5853110ff80SHarvey Harrison dprintk("%s: start\n", __func__); 5861da177e4SLinus Torvalds status = decode_op_hdr(xdr_in, &op_nr); 58734bc47c9SBenny Halevy if (unlikely(status)) { 5881da177e4SLinus Torvalds status = htonl(NFS4ERR_OP_ILLEGAL); 58934bc47c9SBenny Halevy goto out; 590a162a6b8STrond Myklebust } 5911da177e4SLinus Torvalds 59234bc47c9SBenny Halevy dprintk("%s: minorversion=%d nop=%d op_nr=%u\n", 59334bc47c9SBenny Halevy __func__, minorversion, nop, op_nr); 59434bc47c9SBenny Halevy 59534bc47c9SBenny Halevy status = minorversion ? preprocess_nfs41_op(nop, op_nr, &op) : 59634bc47c9SBenny Halevy preprocess_nfs4_op(op_nr, &op); 59734bc47c9SBenny Halevy if (status == htonl(NFS4ERR_OP_ILLEGAL)) 59834bc47c9SBenny Halevy op_nr = OP_CB_ILLEGAL; 59934bc47c9SBenny Halevy out: 6001da177e4SLinus Torvalds maxlen = xdr_out->end - xdr_out->p; 6011da177e4SLinus Torvalds if (maxlen > 0 && maxlen < PAGE_SIZE) { 6021da177e4SLinus Torvalds if (likely(status == 0 && op->decode_args != NULL)) 6031da177e4SLinus Torvalds status = op->decode_args(rqstp, xdr_in, argp); 6041da177e4SLinus Torvalds if (likely(status == 0 && op->process_op != NULL)) 6051da177e4SLinus Torvalds status = op->process_op(argp, resp); 6061da177e4SLinus Torvalds } else 6071da177e4SLinus Torvalds status = htonl(NFS4ERR_RESOURCE); 6081da177e4SLinus Torvalds 6091da177e4SLinus Torvalds res = encode_op_hdr(xdr_out, op_nr, status); 6101da177e4SLinus Torvalds if (status == 0) 6111da177e4SLinus Torvalds status = res; 6121da177e4SLinus Torvalds if (op->encode_res != NULL && status == 0) 6131da177e4SLinus Torvalds status = op->encode_res(rqstp, xdr_out, resp); 6143110ff80SHarvey Harrison dprintk("%s: done, status = %d\n", __func__, ntohl(status)); 6151da177e4SLinus Torvalds return status; 6161da177e4SLinus Torvalds } 6171da177e4SLinus Torvalds 6181da177e4SLinus Torvalds /* 6191da177e4SLinus Torvalds * Decode, process and encode a COMPOUND 6201da177e4SLinus Torvalds */ 6217111c66eSAl Viro static __be32 nfs4_callback_compound(struct svc_rqst *rqstp, void *argp, void *resp) 6221da177e4SLinus Torvalds { 6233a6258e1STrond Myklebust struct cb_compound_hdr_arg hdr_arg = { 0 }; 6243a6258e1STrond Myklebust struct cb_compound_hdr_res hdr_res = { NULL }; 6251da177e4SLinus Torvalds struct xdr_stream xdr_in, xdr_out; 6265704fdebSAl Viro __be32 *p; 627e6f684f6SAl Viro __be32 status; 6283a6258e1STrond Myklebust unsigned int nops = 0; 6291da177e4SLinus Torvalds 6303110ff80SHarvey Harrison dprintk("%s: start\n", __func__); 6311da177e4SLinus Torvalds 6321da177e4SLinus Torvalds xdr_init_decode(&xdr_in, &rqstp->rq_arg, rqstp->rq_arg.head[0].iov_base); 6331da177e4SLinus Torvalds 6345704fdebSAl Viro p = (__be32*)((char *)rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len); 6351da177e4SLinus Torvalds xdr_init_encode(&xdr_out, &rqstp->rq_res, p); 6361da177e4SLinus Torvalds 6373a6258e1STrond Myklebust status = decode_compound_hdr_arg(&xdr_in, &hdr_arg); 6383a6258e1STrond Myklebust if (status == __constant_htonl(NFS4ERR_RESOURCE)) 6393a6258e1STrond Myklebust return rpc_garbage_args; 6403a6258e1STrond Myklebust 6411da177e4SLinus Torvalds hdr_res.taglen = hdr_arg.taglen; 6421da177e4SLinus Torvalds hdr_res.tag = hdr_arg.tag; 6433a6258e1STrond Myklebust if (encode_compound_hdr_res(&xdr_out, &hdr_res) != 0) 6443a6258e1STrond Myklebust return rpc_system_err; 6451da177e4SLinus Torvalds 6463a6258e1STrond Myklebust while (status == 0 && nops != hdr_arg.nops) { 64734bc47c9SBenny Halevy status = process_op(hdr_arg.minorversion, nops, 64834bc47c9SBenny Halevy rqstp, &xdr_in, argp, &xdr_out, resp); 6491da177e4SLinus Torvalds nops++; 6501da177e4SLinus Torvalds } 6513a6258e1STrond Myklebust 6521da177e4SLinus Torvalds *hdr_res.status = status; 6531da177e4SLinus Torvalds *hdr_res.nops = htonl(nops); 6543110ff80SHarvey Harrison dprintk("%s: done, status = %u\n", __func__, ntohl(status)); 6551da177e4SLinus Torvalds return rpc_success; 6561da177e4SLinus Torvalds } 6571da177e4SLinus Torvalds 6581da177e4SLinus Torvalds /* 6591da177e4SLinus Torvalds * Define NFS4 callback COMPOUND ops. 6601da177e4SLinus Torvalds */ 6611da177e4SLinus Torvalds static struct callback_op callback_ops[] = { 6621da177e4SLinus Torvalds [0] = { 6631da177e4SLinus Torvalds .res_maxsize = CB_OP_HDR_RES_MAXSZ, 6641da177e4SLinus Torvalds }, 6651da177e4SLinus Torvalds [OP_CB_GETATTR] = { 6661da177e4SLinus Torvalds .process_op = (callback_process_op_t)nfs4_callback_getattr, 6671da177e4SLinus Torvalds .decode_args = (callback_decode_arg_t)decode_getattr_args, 6681da177e4SLinus Torvalds .encode_res = (callback_encode_res_t)encode_getattr_res, 6691da177e4SLinus Torvalds .res_maxsize = CB_OP_GETATTR_RES_MAXSZ, 6701da177e4SLinus Torvalds }, 6711da177e4SLinus Torvalds [OP_CB_RECALL] = { 6721da177e4SLinus Torvalds .process_op = (callback_process_op_t)nfs4_callback_recall, 6731da177e4SLinus Torvalds .decode_args = (callback_decode_arg_t)decode_recall_args, 6741da177e4SLinus Torvalds .res_maxsize = CB_OP_RECALL_RES_MAXSZ, 6754aece6a1SBenny Halevy }, 6764aece6a1SBenny Halevy #if defined(CONFIG_NFS_V4_1) 6774aece6a1SBenny Halevy [OP_CB_SEQUENCE] = { 6784aece6a1SBenny Halevy .process_op = (callback_process_op_t)nfs4_callback_sequence, 6794aece6a1SBenny Halevy .decode_args = (callback_decode_arg_t)decode_cb_sequence_args, 6804aece6a1SBenny Halevy .encode_res = (callback_encode_res_t)encode_cb_sequence_res, 6814aece6a1SBenny Halevy .res_maxsize = CB_OP_SEQUENCE_RES_MAXSZ, 6824aece6a1SBenny Halevy }, 6834aece6a1SBenny Halevy #endif /* CONFIG_NFS_V4_1 */ 6841da177e4SLinus Torvalds }; 6851da177e4SLinus Torvalds 6861da177e4SLinus Torvalds /* 6871da177e4SLinus Torvalds * Define NFS4 callback procedures 6881da177e4SLinus Torvalds */ 6891da177e4SLinus Torvalds static struct svc_procedure nfs4_callback_procedures1[] = { 6901da177e4SLinus Torvalds [CB_NULL] = { 6911da177e4SLinus Torvalds .pc_func = nfs4_callback_null, 6921da177e4SLinus Torvalds .pc_decode = (kxdrproc_t)nfs4_decode_void, 6931da177e4SLinus Torvalds .pc_encode = (kxdrproc_t)nfs4_encode_void, 6941da177e4SLinus Torvalds .pc_xdrressize = 1, 6951da177e4SLinus Torvalds }, 6961da177e4SLinus Torvalds [CB_COMPOUND] = { 6971da177e4SLinus Torvalds .pc_func = nfs4_callback_compound, 6981da177e4SLinus Torvalds .pc_encode = (kxdrproc_t)nfs4_encode_void, 6991da177e4SLinus Torvalds .pc_argsize = 256, 7001da177e4SLinus Torvalds .pc_ressize = 256, 7011da177e4SLinus Torvalds .pc_xdrressize = NFS4_CALLBACK_BUFSIZE, 7021da177e4SLinus Torvalds } 7031da177e4SLinus Torvalds }; 7041da177e4SLinus Torvalds 7051da177e4SLinus Torvalds struct svc_version nfs4_callback_version1 = { 7061da177e4SLinus Torvalds .vs_vers = 1, 7071da177e4SLinus Torvalds .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1), 7081da177e4SLinus Torvalds .vs_proc = nfs4_callback_procedures1, 7091da177e4SLinus Torvalds .vs_xdrsize = NFS4_CALLBACK_XDRSIZE, 7101da177e4SLinus Torvalds .vs_dispatch = NULL, 7111da177e4SLinus Torvalds }; 7121da177e4SLinus Torvalds 713