cregit-Linux how code gets into the kernel

Release 4.11 net/9p/protocol.c

Directory: net/9p
/*
 * net/9p/protocol.c
 *
 * 9P Protocol Support Code
 *
 *  Copyright (C) 2008 by Eric Van Hensbergen <ericvh@gmail.com>
 *
 *  Base on code from Anthony Liguori <aliguori@us.ibm.com>
 *  Copyright (C) 2008 by IBM, Corp.
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2
 *  as published by the Free Software Foundation.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to:
 *  Free Software Foundation
 *  51 Franklin Street, Fifth Floor
 *  Boston, MA  02111-1301  USA
 *
 */

#include <linux/module.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/uaccess.h>
#include <linux/slab.h>
#include <linux/sched.h>
#include <linux/stddef.h>
#include <linux/types.h>
#include <linux/uio.h>
#include <net/9p/9p.h>
#include <net/9p/client.h>
#include "protocol.h"

#include <trace/events/9p.h>

static int
p9pdu_writef(struct p9_fcall *pdu, int proto_version, const char *fmt, ...);


void p9stat_free(struct p9_wstat *stbuf) { kfree(stbuf->name); kfree(stbuf->uid); kfree(stbuf->gid); kfree(stbuf->muid); kfree(stbuf->extension); }

Contributors

PersonTokensPropCommitsCommitProp
Eric Van Hensbergen45100.00%1100.00%
Total45100.00%1100.00%

EXPORT_SYMBOL(p9stat_free);
size_t pdu_read(struct p9_fcall *pdu, void *data, size_t size) { size_t len = min(pdu->size - pdu->offset, size); memcpy(data, &pdu->sdata[pdu->offset], len); pdu->offset += len; return size - len; }

Contributors

PersonTokensPropCommitsCommitProp
Eric Van Hensbergen6098.36%150.00%
Thiago Farina11.64%150.00%
Total61100.00%2100.00%


static size_t pdu_write(struct p9_fcall *pdu, const void *data, size_t size) { size_t len = min(pdu->capacity - pdu->size, size); memcpy(&pdu->sdata[pdu->size], data, len); pdu->size += len; return size - len; }

Contributors

PersonTokensPropCommitsCommitProp
Eric Van Hensbergen6298.41%150.00%
Thiago Farina11.59%150.00%
Total63100.00%2100.00%


static size_t pdu_write_u(struct p9_fcall *pdu, struct iov_iter *from, size_t size) { size_t len = min(pdu->capacity - pdu->size, size); struct iov_iter i = *from; if (copy_from_iter(&pdu->sdata[pdu->size], len, &i) != len) len = 0; pdu->size += len; return size - len; }

Contributors

PersonTokensPropCommitsCommitProp
Eric Van Hensbergen5772.15%125.00%
Al Viro1620.25%125.00%
Aneesh Kumar K.V56.33%125.00%
Thiago Farina11.27%125.00%
Total79100.00%4100.00%

/* b - int8_t w - int16_t d - int32_t q - int64_t s - string u - numeric uid g - numeric gid S - stat Q - qid D - data blob (int32_t size followed by void *, results are not freed) T - array of strings (int16_t count, followed by strings) R - array of qids (int16_t count, followed by qids) A - stat for 9p2000.L (p9_stat_dotl) ? - if optional = 1, continue parsing */
static int p9pdu_vreadf(struct p9_fcall *pdu, int proto_version, const char *fmt, va_list ap) { const char *ptr; int errcode = 0; for (ptr = fmt; *ptr; ptr++) { switch (*ptr) { case 'b':{ int8_t *val = va_arg(ap, int8_t *); if (pdu_read(pdu, val, sizeof(*val))) { errcode = -EFAULT; break; } } break; case 'w':{ int16_t *val = va_arg(ap, int16_t *); __le16 le_val; if (pdu_read(pdu, &le_val, sizeof(le_val))) { errcode = -EFAULT; break; } *val = le16_to_cpu(le_val); } break; case 'd':{ int32_t *val = va_arg(ap, int32_t *); __le32 le_val; if (pdu_read(pdu, &le_val, sizeof(le_val))) { errcode = -EFAULT; break; } *val = le32_to_cpu(le_val); } break; case 'q':{ int64_t *val = va_arg(ap, int64_t *); __le64 le_val; if (pdu_read(pdu, &le_val, sizeof(le_val))) { errcode = -EFAULT; break; } *val = le64_to_cpu(le_val); } break; case 's':{ char **sptr = va_arg(ap, char **); uint16_t len; errcode = p9pdu_readf(pdu, proto_version, "w", &len); if (errcode) break; *sptr = kmalloc(len + 1, GFP_NOFS); if (*sptr == NULL) { errcode = -EFAULT; break; } if (pdu_read(pdu, *sptr, len)) { errcode = -EFAULT; kfree(*sptr); *sptr = NULL; } else (*sptr)[len] = 0; } break; case 'u': { kuid_t *uid = va_arg(ap, kuid_t *); __le32 le_val; if (pdu_read(pdu, &le_val, sizeof(le_val))) { errcode = -EFAULT; break; } *uid = make_kuid(&init_user_ns, le32_to_cpu(le_val)); } break; case 'g': { kgid_t *gid = va_arg(ap, kgid_t *); __le32 le_val; if (pdu_read(pdu, &le_val, sizeof(le_val))) { errcode = -EFAULT; break; } *gid = make_kgid(&init_user_ns, le32_to_cpu(le_val)); } break; case 'Q':{ struct p9_qid *qid = va_arg(ap, struct p9_qid *); errcode = p9pdu_readf(pdu, proto_version, "bdq", &qid->type, &qid->version, &qid->path); } break; case 'S':{ struct p9_wstat *stbuf = va_arg(ap, struct p9_wstat *); memset(stbuf, 0, sizeof(struct p9_wstat)); stbuf->n_uid = stbuf->n_muid = INVALID_UID; stbuf->n_gid = INVALID_GID; errcode = p9pdu_readf(pdu, proto_version, "wwdQdddqssss?sugu", &stbuf->size, &stbuf->type, &stbuf->dev, &stbuf->qid, &stbuf->mode, &stbuf->atime, &stbuf->mtime, &stbuf->length, &stbuf->name, &stbuf->uid, &stbuf->gid, &stbuf->muid, &stbuf->extension, &stbuf->n_uid, &stbuf->n_gid, &stbuf->n_muid); if (errcode) p9stat_free(stbuf); } break; case 'D':{ uint32_t *count = va_arg(ap, uint32_t *); void **data = va_arg(ap, void **); errcode = p9pdu_readf(pdu, proto_version, "d", count); if (!errcode) { *count = min_t(uint32_t, *count, pdu->size - pdu->offset); *data = &pdu->sdata[pdu->offset]; } } break; case 'T':{ uint16_t *nwname = va_arg(ap, uint16_t *); char ***wnames = va_arg(ap, char ***); errcode = p9pdu_readf(pdu, proto_version, "w", nwname); if (!errcode) { *wnames = kmalloc(sizeof(char *) * *nwname, GFP_NOFS); if (!*wnames) errcode = -ENOMEM; } if (!errcode) { int i; for (i = 0; i < *nwname; i++) { errcode = p9pdu_readf(pdu, proto_version, "s", &(*wnames)[i]); if (errcode) break; } } if (errcode) { if (*wnames) { int i; for (i = 0; i < *nwname; i++) kfree((*wnames)[i]); } kfree(*wnames); *wnames = NULL; } } break; case 'R':{ uint16_t *nwqid = va_arg(ap, uint16_t *); struct p9_qid **wqids = va_arg(ap, struct p9_qid **); *wqids = NULL; errcode = p9pdu_readf(pdu, proto_version, "w", nwqid); if (!errcode) { *wqids = kmalloc(*nwqid * sizeof(struct p9_qid), GFP_NOFS); if (*wqids == NULL) errcode = -ENOMEM; } if (!errcode) { int i; for (i = 0; i < *nwqid; i++) { errcode = p9pdu_readf(pdu, proto_version, "Q", &(*wqids)[i]); if (errcode) break; } } if (errcode) { kfree(*wqids); *wqids = NULL; } } break; case 'A': { struct p9_stat_dotl *stbuf = va_arg(ap, struct p9_stat_dotl *); memset(stbuf, 0, sizeof(struct p9_stat_dotl)); errcode = p9pdu_readf(pdu, proto_version, "qQdugqqqqqqqqqqqqqqq", &stbuf->st_result_mask, &stbuf->qid, &stbuf->st_mode, &stbuf->st_uid, &stbuf->st_gid, &stbuf->st_nlink, &stbuf->st_rdev, &stbuf->st_size, &stbuf->st_blksize, &stbuf->st_blocks, &stbuf->st_atime_sec, &stbuf->st_atime_nsec, &stbuf->st_mtime_sec, &stbuf->st_mtime_nsec, &stbuf->st_ctime_sec, &stbuf->st_ctime_nsec, &stbuf->st_btime_sec, &stbuf->st_btime_nsec, &stbuf->st_gen, &stbuf->st_data_version); } break; case '?': if ((proto_version != p9_proto_2000u) && (proto_version != p9_proto_2000L)) return 0; break; default: BUG(); break; } if (errcode) break; } return errcode; }

Contributors

PersonTokensPropCommitsCommitProp
Eric Van Hensbergen97276.30%428.57%
Sripathi Kodi16312.79%321.43%
Eric W. Biedermann1239.65%214.29%
M. Mohan Kumar70.55%17.14%
Aneesh Kumar K.V30.24%17.14%
Harsh Prateek Bora20.16%17.14%
Thiago Farina20.16%17.14%
Kirill A. Shutemov20.16%17.14%
Total1274100.00%14100.00%


int p9pdu_vwritef(struct p9_fcall *pdu, int proto_version, const char *fmt, va_list ap) { const char *ptr; int errcode = 0; for (ptr = fmt; *ptr; ptr++) { switch (*ptr) { case 'b':{ int8_t val = va_arg(ap, int); if (pdu_write(pdu, &val, sizeof(val))) errcode = -EFAULT; } break; case 'w':{ __le16 val = cpu_to_le16(va_arg(ap, int)); if (pdu_write(pdu, &val, sizeof(val))) errcode = -EFAULT; } break; case 'd':{ __le32 val = cpu_to_le32(va_arg(ap, int32_t)); if (pdu_write(pdu, &val, sizeof(val))) errcode = -EFAULT; } break; case 'q':{ __le64 val = cpu_to_le64(va_arg(ap, int64_t)); if (pdu_write(pdu, &val, sizeof(val))) errcode = -EFAULT; } break; case 's':{ const char *sptr = va_arg(ap, const char *); uint16_t len = 0; if (sptr) len = min_t(size_t, strlen(sptr), USHRT_MAX); errcode = p9pdu_writef(pdu, proto_version, "w", len); if (!errcode && pdu_write(pdu, sptr, len)) errcode = -EFAULT; } break; case 'u': { kuid_t uid = va_arg(ap, kuid_t); __le32 val = cpu_to_le32( from_kuid(&init_user_ns, uid)); if (pdu_write(pdu, &val, sizeof(val))) errcode = -EFAULT; } break; case 'g': { kgid_t gid = va_arg(ap, kgid_t); __le32 val = cpu_to_le32( from_kgid(&init_user_ns, gid)); if (pdu_write(pdu, &val, sizeof(val))) errcode = -EFAULT; } break; case 'Q':{ const struct p9_qid *qid = va_arg(ap, const struct p9_qid *); errcode = p9pdu_writef(pdu, proto_version, "bdq", qid->type, qid->version, qid->path); } break; case 'S':{ const struct p9_wstat *stbuf = va_arg(ap, const struct p9_wstat *); errcode = p9pdu_writef(pdu, proto_version, "wwdQdddqssss?sugu", stbuf->size, stbuf->type, stbuf->dev, &stbuf->qid, stbuf->mode, stbuf->atime, stbuf->mtime, stbuf->length, stbuf->name, stbuf->uid, stbuf->gid, stbuf->muid, stbuf->extension, stbuf->n_uid, stbuf->n_gid, stbuf->n_muid); } break; case 'V':{ uint32_t count = va_arg(ap, uint32_t); struct iov_iter *from = va_arg(ap, struct iov_iter *); errcode = p9pdu_writef(pdu, proto_version, "d", count); if (!errcode && pdu_write_u(pdu, from, count)) errcode = -EFAULT; } break; case 'T':{ uint16_t nwname = va_arg(ap, int); const char **wnames = va_arg(ap, const char **); errcode = p9pdu_writef(pdu, proto_version, "w", nwname); if (!errcode) { int i; for (i = 0; i < nwname; i++) { errcode = p9pdu_writef(pdu, proto_version, "s", wnames[i]); if (errcode) break; } } } break; case 'R':{ uint16_t nwqid = va_arg(ap, int); struct p9_qid *wqids = va_arg(ap, struct p9_qid *); errcode = p9pdu_writef(pdu, proto_version, "w", nwqid); if (!errcode) { int i; for (i = 0; i < nwqid; i++) { errcode = p9pdu_writef(pdu, proto_version, "Q", &wqids[i]); if (errcode) break; } } } break; case 'I':{ struct p9_iattr_dotl *p9attr = va_arg(ap, struct p9_iattr_dotl *); errcode = p9pdu_writef(pdu, proto_version, "ddugqqqqq", p9attr->valid, p9attr->mode, p9attr->uid, p9attr->gid, p9attr->size, p9attr->atime_sec, p9attr->atime_nsec, p9attr->mtime_sec, p9attr->mtime_nsec); } break; case '?': if ((proto_version != p9_proto_2000u) && (proto_version != p9_proto_2000L)) return 0; break; default: BUG(); break; } if (errcode) break; } return errcode; }

Contributors

PersonTokensPropCommitsCommitProp
Eric Van Hensbergen66176.24%425.00%
Eric W. Biedermann10211.76%212.50%
Sripathi Kodi869.92%318.75%
Al Viro91.04%16.25%
M. Mohan Kumar30.35%16.25%
Thiago Farina20.23%16.25%
Kirill A. Shutemov10.12%16.25%
Dan Carpenter10.12%16.25%
Alexey Dobriyan10.12%16.25%
Harsh Prateek Bora10.12%16.25%
Total867100.00%16100.00%


int p9pdu_readf(struct p9_fcall *pdu, int proto_version, const char *fmt, ...) { va_list ap; int ret; va_start(ap, fmt); ret = p9pdu_vreadf(pdu, proto_version, fmt, ap); va_end(ap); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Eric Van Hensbergen5296.30%150.00%
Sripathi Kodi23.70%150.00%
Total54100.00%2100.00%


static int p9pdu_writef(struct p9_fcall *pdu, int proto_version, const char *fmt, ...) { va_list ap; int ret; va_start(ap, fmt); ret = p9pdu_vwritef(pdu, proto_version, fmt, ap); va_end(ap); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Eric Van Hensbergen5396.36%150.00%
Sripathi Kodi23.64%150.00%
Total55100.00%2100.00%


int p9stat_read(struct p9_client *clnt, char *buf, int len, struct p9_wstat *st) { struct p9_fcall fake_pdu; int ret; fake_pdu.size = len; fake_pdu.capacity = len; fake_pdu.sdata = buf; fake_pdu.offset = 0; ret = p9pdu_readf(&fake_pdu, clnt->proto_version, "S", st); if (ret) { p9_debug(P9_DEBUG_9P, "<<< p9stat_read failed: %d\n", ret); trace_9p_protocol_dump(clnt, &fake_pdu); } return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Eric Van Hensbergen8488.42%240.00%
Aneesh Kumar K.V99.47%120.00%
Joe Perches11.05%120.00%
Sripathi Kodi11.05%120.00%
Total95100.00%5100.00%

EXPORT_SYMBOL(p9stat_read);
int p9pdu_prepare(struct p9_fcall *pdu, int16_t tag, int8_t type) { pdu->id = type; return p9pdu_writef(pdu, 0, "dbw", 0, type, tag); }

Contributors

PersonTokensPropCommitsCommitProp
Eric Van Hensbergen3284.21%150.00%
Venkateswararao Jujjuri (JV)615.79%150.00%
Total38100.00%2100.00%


int p9pdu_finalize(struct p9_client *clnt, struct p9_fcall *pdu) { int size = pdu->size; int err; pdu->size = 0; err = p9pdu_writef(pdu, 0, "d", size); pdu->size = size; trace_9p_protocol_dump(clnt, pdu); p9_debug(P9_DEBUG_9P, ">>> size=%d type: %d tag: %d\n", pdu->size, pdu->id, pdu->tag); return err; }

Contributors

PersonTokensPropCommitsCommitProp
Eric Van Hensbergen7189.87%250.00%
Aneesh Kumar K.V78.86%125.00%
Joe Perches11.27%125.00%
Total79100.00%4100.00%


void p9pdu_reset(struct p9_fcall *pdu) { pdu->offset = 0; pdu->size = 0; }

Contributors

PersonTokensPropCommitsCommitProp
Eric Van Hensbergen22100.00%1100.00%
Total22100.00%1100.00%


int p9dirent_read(struct p9_client *clnt, char *buf, int len, struct p9_dirent *dirent) { struct p9_fcall fake_pdu; int ret; char *nameptr; fake_pdu.size = len; fake_pdu.capacity = len; fake_pdu.sdata = buf; fake_pdu.offset = 0; ret = p9pdu_readf(&fake_pdu, clnt->proto_version, "Qqbs", &dirent->qid, &dirent->d_off, &dirent->d_type, &nameptr); if (ret) { p9_debug(P9_DEBUG_9P, "<<< p9dirent_read failed: %d\n", ret); trace_9p_protocol_dump(clnt, &fake_pdu); goto out; } strcpy(dirent->d_name, nameptr); kfree(nameptr); out: return fake_pdu.offset; }

Contributors

PersonTokensPropCommitsCommitProp
Sripathi Kodi12188.97%125.00%
Aneesh Kumar K.V96.62%125.00%
Pedro Scarapicchia Junior53.68%125.00%
Joe Perches10.74%125.00%
Total136100.00%4100.00%

EXPORT_SYMBOL(p9dirent_read);

Overall Contributors

PersonTokensPropCommitsCommitProp
Eric Van Hensbergen222575.58%725.00%
Sripathi Kodi38112.94%517.86%
Eric W. Biedermann2267.68%27.14%
Aneesh Kumar K.V361.22%310.71%
Al Viro280.95%13.57%
Thiago Farina130.44%13.57%
M. Mohan Kumar100.34%13.57%
Venkateswararao Jujjuri (JV)60.20%13.57%
Pedro Scarapicchia Junior50.17%13.57%
Joe Perches30.10%13.57%
Tejun Heo30.10%13.57%
Harsh Prateek Bora30.10%13.57%
Kirill A. Shutemov30.10%13.57%
Alexey Dobriyan10.03%13.57%
Dan Carpenter10.03%13.57%
Total2944100.00%28100.00%
Directory: net/9p
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