^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Contains the CIFS DFS referral mounting routines used for handling
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * traversal via DFS junction point
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Copyright (c) 2007 Igor Mammedov
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Copyright (C) International Business Machines Corp., 2008
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * Author(s): Igor Mammedov (niallain@gmail.com)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * Steve French (sfrench@us.ibm.com)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/dcache.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/mount.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/namei.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/vfs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/inet.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include "cifsglob.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include "cifsproto.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include "cifsfs.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include "dns_resolve.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include "cifs_debug.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include "cifs_unicode.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #include "dfs_cache.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) static LIST_HEAD(cifs_dfs_automount_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) static void cifs_dfs_expire_automounts(struct work_struct *work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) static DECLARE_DELAYED_WORK(cifs_dfs_automount_task,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) cifs_dfs_expire_automounts);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) static int cifs_dfs_mountpoint_expiry_timeout = 500 * HZ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) static void cifs_dfs_expire_automounts(struct work_struct *work)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) struct list_head *list = &cifs_dfs_automount_list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) mark_mounts_for_expiry(list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) if (!list_empty(list))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) schedule_delayed_work(&cifs_dfs_automount_task,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) cifs_dfs_mountpoint_expiry_timeout);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) void cifs_dfs_release_automount_timer(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) BUG_ON(!list_empty(&cifs_dfs_automount_list));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) cancel_delayed_work_sync(&cifs_dfs_automount_task);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) * cifs_build_devname - build a devicename from a UNC and optional prepath
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) * @nodename: pointer to UNC string
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) * @prepath: pointer to prefixpath (or NULL if there isn't one)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) * Build a new cifs devicename after chasing a DFS referral. Allocate a buffer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) * big enough to hold the final thing. Copy the UNC from the nodename, and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) * concatenate the prepath onto the end of it if there is one.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) * Returns pointer to the built string, or a ERR_PTR. Caller is responsible
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) * for freeing the returned string.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) static char *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) cifs_build_devname(char *nodename, const char *prepath)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) size_t pplen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) size_t unclen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) char *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) char *pos;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) /* skip over any preceding delimiters */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) nodename += strspn(nodename, "\\");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) if (!*nodename)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) return ERR_PTR(-EINVAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) /* get length of UNC and set pos to last char */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) unclen = strlen(nodename);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) pos = nodename + unclen - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) /* trim off any trailing delimiters */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) while (*pos == '\\') {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) --pos;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) --unclen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) /* allocate a buffer:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) * +2 for preceding "//"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) * +1 for delimiter between UNC and prepath
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) * +1 for trailing NULL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) pplen = prepath ? strlen(prepath) : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) dev = kmalloc(2 + unclen + 1 + pplen + 1, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) if (!dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) return ERR_PTR(-ENOMEM);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) pos = dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) /* add the initial "//" */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) *pos = '/';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) ++pos;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) *pos = '/';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) ++pos;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) /* copy in the UNC portion from referral */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) memcpy(pos, nodename, unclen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) pos += unclen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) /* copy the prefixpath remainder (if there is one) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) if (pplen) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) *pos = '/';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) ++pos;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) memcpy(pos, prepath, pplen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) pos += pplen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) /* NULL terminator */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) *pos = '\0';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) convert_delimiter(dev, '/');
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) return dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) * cifs_compose_mount_options - creates mount options for referral
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) * @sb_mountdata: parent/root DFS mount options (template)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) * @fullpath: full path in UNC format
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) * @ref: optional server's referral
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) * @devname: optional pointer for saving device name
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) * creates mount options for submount based on template options sb_mountdata
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) * and replacing unc,ip,prefixpath options with ones we've got form ref_unc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) * Returns: pointer to new mount options or ERR_PTR.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) * Caller is responsible for freeing returned value if it is not error.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) char *cifs_compose_mount_options(const char *sb_mountdata,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) const char *fullpath,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) const struct dfs_info3_param *ref,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) char **devname)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) char *name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) char *mountdata = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) const char *prepath = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) int md_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) char *tkn_e;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) char *srvIP = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) char sep = ',';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) int off, noff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) if (sb_mountdata == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) return ERR_PTR(-EINVAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) if (ref) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) if (WARN_ON_ONCE(!ref->node_name || ref->path_consumed < 0))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) return ERR_PTR(-EINVAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) if (strlen(fullpath) - ref->path_consumed) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) prepath = fullpath + ref->path_consumed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) /* skip initial delimiter */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) if (*prepath == '/' || *prepath == '\\')
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) prepath++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) name = cifs_build_devname(ref->node_name, prepath);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) if (IS_ERR(name)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) rc = PTR_ERR(name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) name = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) goto compose_mount_options_err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) name = cifs_build_devname((char *)fullpath, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) if (IS_ERR(name)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) rc = PTR_ERR(name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) name = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) goto compose_mount_options_err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) rc = dns_resolve_server_name_to_ip(name, &srvIP);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) if (rc < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) cifs_dbg(FYI, "%s: Failed to resolve server part of %s to IP: %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) __func__, name, rc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) goto compose_mount_options_err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) * In most cases, we'll be building a shorter string than the original,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) * but we do have to assume that the address in the ip= option may be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) * much longer than the original. Add the max length of an address
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) * string to the length of the original string to allow for worst case.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) md_len = strlen(sb_mountdata) + INET6_ADDRSTRLEN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) mountdata = kzalloc(md_len + sizeof("ip=") + 1, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) if (mountdata == NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) rc = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) goto compose_mount_options_err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) /* copy all options except of unc,ip,prefixpath */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) off = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) if (strncmp(sb_mountdata, "sep=", 4) == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) sep = sb_mountdata[4];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) strncpy(mountdata, sb_mountdata, 5);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) off += 5;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) tkn_e = strchr(sb_mountdata + off, sep);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) if (tkn_e == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) noff = strlen(sb_mountdata + off);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) noff = tkn_e - (sb_mountdata + off) + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) if (strncasecmp(sb_mountdata + off, "unc=", 4) == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) off += noff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) if (strncasecmp(sb_mountdata + off, "ip=", 3) == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) off += noff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) if (strncasecmp(sb_mountdata + off, "prefixpath=", 11) == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) off += noff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) strncat(mountdata, sb_mountdata + off, noff);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) off += noff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) } while (tkn_e);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) strcat(mountdata, sb_mountdata + off);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) mountdata[md_len] = '\0';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) /* copy new IP and ref share name */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) if (mountdata[strlen(mountdata) - 1] != sep)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) strncat(mountdata, &sep, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) strcat(mountdata, "ip=");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) strcat(mountdata, srvIP);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) if (devname)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) *devname = name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) kfree(name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) /*cifs_dbg(FYI, "%s: parent mountdata: %s\n", __func__, sb_mountdata);*/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) /*cifs_dbg(FYI, "%s: submount mountdata: %s\n", __func__, mountdata );*/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) compose_mount_options_out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) kfree(srvIP);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) return mountdata;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) compose_mount_options_err:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) kfree(mountdata);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) mountdata = ERR_PTR(rc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) kfree(name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) goto compose_mount_options_out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) * cifs_dfs_do_mount - mounts specified path using DFS full path
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) * Always pass down @fullpath to smb3_do_mount() so we can use the root server
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) * to perform failover in case we failed to connect to the first target in the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) * referral.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) * @cifs_sb: parent/root superblock
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) * @fullpath: full path in UNC format
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) static struct vfsmount *cifs_dfs_do_mount(struct dentry *mntpt,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) struct cifs_sb_info *cifs_sb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) const char *fullpath)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) struct vfsmount *mnt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) char *mountdata;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) char *devname;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) devname = kstrndup(fullpath, strlen(fullpath), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) if (!devname)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) return ERR_PTR(-ENOMEM);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) convert_delimiter(devname, '/');
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) /* strip first '\' from fullpath */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) mountdata = cifs_compose_mount_options(cifs_sb->mountdata,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) fullpath + 1, NULL, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) if (IS_ERR(mountdata)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) kfree(devname);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) return (struct vfsmount *)mountdata;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) mnt = vfs_submount(mntpt, &cifs_fs_type, devname, mountdata);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) kfree(mountdata);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) kfree(devname);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) return mnt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) * Create a vfsmount that we can automount
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) static struct vfsmount *cifs_dfs_do_automount(struct dentry *mntpt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) struct cifs_sb_info *cifs_sb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) struct cifs_ses *ses;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) struct cifs_tcon *tcon;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) char *full_path, *root_path;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) unsigned int xid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) struct vfsmount *mnt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) cifs_dbg(FYI, "in %s\n", __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) BUG_ON(IS_ROOT(mntpt));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) * The MSDFS spec states that paths in DFS referral requests and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) * responses must be prefixed by a single '\' character instead of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) * the double backslashes usually used in the UNC. This function
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) * gives us the latter, so we must adjust the result.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) mnt = ERR_PTR(-ENOMEM);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) cifs_sb = CIFS_SB(mntpt->d_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_DFS) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) mnt = ERR_PTR(-EREMOTE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) goto cdda_exit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) /* always use tree name prefix */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) full_path = build_path_from_dentry_optional_prefix(mntpt, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) if (full_path == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) goto cdda_exit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) convert_delimiter(full_path, '\\');
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) cifs_dbg(FYI, "%s: full_path: %s\n", __func__, full_path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) if (!cifs_sb_master_tlink(cifs_sb)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) cifs_dbg(FYI, "%s: master tlink is NULL\n", __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) goto free_full_path;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) tcon = cifs_sb_master_tcon(cifs_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) if (!tcon) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) cifs_dbg(FYI, "%s: master tcon is NULL\n", __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) goto free_full_path;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) root_path = kstrdup(tcon->treeName, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) if (!root_path) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) mnt = ERR_PTR(-ENOMEM);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) goto free_full_path;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) cifs_dbg(FYI, "%s: root path: %s\n", __func__, root_path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) ses = tcon->ses;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) xid = get_xid();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) * If DFS root has been expired, then unconditionally fetch it again to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) * refresh DFS referral cache.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) rc = dfs_cache_find(xid, ses, cifs_sb->local_nls, cifs_remap(cifs_sb),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) root_path + 1, NULL, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) if (!rc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) rc = dfs_cache_find(xid, ses, cifs_sb->local_nls,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) cifs_remap(cifs_sb), full_path + 1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) NULL, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) free_xid(xid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) if (rc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) mnt = ERR_PTR(rc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) goto free_root_path;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) * OK - we were able to get and cache a referral for @full_path.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) * Now, pass it down to cifs_mount() and it will retry every available
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) * node server in case of failures - no need to do it here.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) mnt = cifs_dfs_do_mount(mntpt, cifs_sb, full_path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) cifs_dbg(FYI, "%s: cifs_dfs_do_mount:%s , mnt:%p\n", __func__,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) full_path + 1, mnt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) free_root_path:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) kfree(root_path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) free_full_path:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) kfree(full_path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) cdda_exit:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) cifs_dbg(FYI, "leaving %s\n" , __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) return mnt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) * Attempt to automount the referral
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) struct vfsmount *cifs_dfs_d_automount(struct path *path)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) struct vfsmount *newmnt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) cifs_dbg(FYI, "in %s\n", __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) newmnt = cifs_dfs_do_automount(path->dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) if (IS_ERR(newmnt)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) cifs_dbg(FYI, "leaving %s [automount failed]\n" , __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) return newmnt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) mntget(newmnt); /* prevent immediate expiration */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) mnt_set_expiry(newmnt, &cifs_dfs_automount_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) schedule_delayed_work(&cifs_dfs_automount_task,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) cifs_dfs_mountpoint_expiry_timeout);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) cifs_dbg(FYI, "leaving %s [ok]\n" , __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) return newmnt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) const struct inode_operations cifs_dfs_referral_inode_operations = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) };
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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