v4.19.13 snapshot.
diff --git a/fs/nfsd/export.c b/fs/nfsd/export.c
new file mode 100644
index 0000000..a1143f7
--- /dev/null
+++ b/fs/nfsd/export.c
@@ -0,0 +1,1291 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * NFS exporting and validation.
+ *
+ * We maintain a list of clients, each of which has a list of
+ * exports. To export an fs to a given client, you first have
+ * to create the client entry with NFSCTL_ADDCLIENT, which
+ * creates a client control block and adds it to the hash
+ * table. Then, you call NFSCTL_EXPORT for each fs.
+ *
+ *
+ * Copyright (C) 1995, 1996 Olaf Kirch, <okir@monad.swb.de>
+ */
+
+#include <linux/slab.h>
+#include <linux/namei.h>
+#include <linux/module.h>
+#include <linux/exportfs.h>
+#include <linux/sunrpc/svc_xprt.h>
+
+#include "nfsd.h"
+#include "nfsfh.h"
+#include "netns.h"
+#include "pnfs.h"
+
+#define NFSDDBG_FACILITY NFSDDBG_EXPORT
+
+/*
+ * We have two caches.
+ * One maps client+vfsmnt+dentry to export options - the export map
+ * The other maps client+filehandle-fragment to export options. - the expkey map
+ *
+ * The export options are actually stored in the first map, and the
+ * second map contains a reference to the entry in the first map.
+ */
+
+#define EXPKEY_HASHBITS 8
+#define EXPKEY_HASHMAX (1 << EXPKEY_HASHBITS)
+#define EXPKEY_HASHMASK (EXPKEY_HASHMAX -1)
+
+static void expkey_put(struct kref *ref)
+{
+ struct svc_expkey *key = container_of(ref, struct svc_expkey, h.ref);
+
+ if (test_bit(CACHE_VALID, &key->h.flags) &&
+ !test_bit(CACHE_NEGATIVE, &key->h.flags))
+ path_put(&key->ek_path);
+ auth_domain_put(key->ek_client);
+ kfree(key);
+}
+
+static void expkey_request(struct cache_detail *cd,
+ struct cache_head *h,
+ char **bpp, int *blen)
+{
+ /* client fsidtype \xfsid */
+ struct svc_expkey *ek = container_of(h, struct svc_expkey, h);
+ char type[5];
+
+ qword_add(bpp, blen, ek->ek_client->name);
+ snprintf(type, 5, "%d", ek->ek_fsidtype);
+ qword_add(bpp, blen, type);
+ qword_addhex(bpp, blen, (char*)ek->ek_fsid, key_len(ek->ek_fsidtype));
+ (*bpp)[-1] = '\n';
+}
+
+static struct svc_expkey *svc_expkey_update(struct cache_detail *cd, struct svc_expkey *new,
+ struct svc_expkey *old);
+static struct svc_expkey *svc_expkey_lookup(struct cache_detail *cd, struct svc_expkey *);
+
+static int expkey_parse(struct cache_detail *cd, char *mesg, int mlen)
+{
+ /* client fsidtype fsid expiry [path] */
+ char *buf;
+ int len;
+ struct auth_domain *dom = NULL;
+ int err;
+ int fsidtype;
+ char *ep;
+ struct svc_expkey key;
+ struct svc_expkey *ek = NULL;
+
+ if (mesg[mlen - 1] != '\n')
+ return -EINVAL;
+ mesg[mlen-1] = 0;
+
+ buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
+ err = -ENOMEM;
+ if (!buf)
+ goto out;
+
+ err = -EINVAL;
+ if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
+ goto out;
+
+ err = -ENOENT;
+ dom = auth_domain_find(buf);
+ if (!dom)
+ goto out;
+ dprintk("found domain %s\n", buf);
+
+ err = -EINVAL;
+ if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
+ goto out;
+ fsidtype = simple_strtoul(buf, &ep, 10);
+ if (*ep)
+ goto out;
+ dprintk("found fsidtype %d\n", fsidtype);
+ if (key_len(fsidtype)==0) /* invalid type */
+ goto out;
+ if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
+ goto out;
+ dprintk("found fsid length %d\n", len);
+ if (len != key_len(fsidtype))
+ goto out;
+
+ /* OK, we seem to have a valid key */
+ key.h.flags = 0;
+ key.h.expiry_time = get_expiry(&mesg);
+ if (key.h.expiry_time == 0)
+ goto out;
+
+ key.ek_client = dom;
+ key.ek_fsidtype = fsidtype;
+ memcpy(key.ek_fsid, buf, len);
+
+ ek = svc_expkey_lookup(cd, &key);
+ err = -ENOMEM;
+ if (!ek)
+ goto out;
+
+ /* now we want a pathname, or empty meaning NEGATIVE */
+ err = -EINVAL;
+ len = qword_get(&mesg, buf, PAGE_SIZE);
+ if (len < 0)
+ goto out;
+ dprintk("Path seems to be <%s>\n", buf);
+ err = 0;
+ if (len == 0) {
+ set_bit(CACHE_NEGATIVE, &key.h.flags);
+ ek = svc_expkey_update(cd, &key, ek);
+ if (!ek)
+ err = -ENOMEM;
+ } else {
+ err = kern_path(buf, 0, &key.ek_path);
+ if (err)
+ goto out;
+
+ dprintk("Found the path %s\n", buf);
+
+ ek = svc_expkey_update(cd, &key, ek);
+ if (!ek)
+ err = -ENOMEM;
+ path_put(&key.ek_path);
+ }
+ cache_flush();
+ out:
+ if (ek)
+ cache_put(&ek->h, cd);
+ if (dom)
+ auth_domain_put(dom);
+ kfree(buf);
+ return err;
+}
+
+static int expkey_show(struct seq_file *m,
+ struct cache_detail *cd,
+ struct cache_head *h)
+{
+ struct svc_expkey *ek ;
+ int i;
+
+ if (h ==NULL) {
+ seq_puts(m, "#domain fsidtype fsid [path]\n");
+ return 0;
+ }
+ ek = container_of(h, struct svc_expkey, h);
+ seq_printf(m, "%s %d 0x", ek->ek_client->name,
+ ek->ek_fsidtype);
+ for (i=0; i < key_len(ek->ek_fsidtype)/4; i++)
+ seq_printf(m, "%08x", ek->ek_fsid[i]);
+ if (test_bit(CACHE_VALID, &h->flags) &&
+ !test_bit(CACHE_NEGATIVE, &h->flags)) {
+ seq_printf(m, " ");
+ seq_path(m, &ek->ek_path, "\\ \t\n");
+ }
+ seq_printf(m, "\n");
+ return 0;
+}
+
+static inline int expkey_match (struct cache_head *a, struct cache_head *b)
+{
+ struct svc_expkey *orig = container_of(a, struct svc_expkey, h);
+ struct svc_expkey *new = container_of(b, struct svc_expkey, h);
+
+ if (orig->ek_fsidtype != new->ek_fsidtype ||
+ orig->ek_client != new->ek_client ||
+ memcmp(orig->ek_fsid, new->ek_fsid, key_len(orig->ek_fsidtype)) != 0)
+ return 0;
+ return 1;
+}
+
+static inline void expkey_init(struct cache_head *cnew,
+ struct cache_head *citem)
+{
+ struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
+ struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
+
+ kref_get(&item->ek_client->ref);
+ new->ek_client = item->ek_client;
+ new->ek_fsidtype = item->ek_fsidtype;
+
+ memcpy(new->ek_fsid, item->ek_fsid, sizeof(new->ek_fsid));
+}
+
+static inline void expkey_update(struct cache_head *cnew,
+ struct cache_head *citem)
+{
+ struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
+ struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
+
+ new->ek_path = item->ek_path;
+ path_get(&item->ek_path);
+}
+
+static struct cache_head *expkey_alloc(void)
+{
+ struct svc_expkey *i = kmalloc(sizeof(*i), GFP_KERNEL);
+ if (i)
+ return &i->h;
+ else
+ return NULL;
+}
+
+static const struct cache_detail svc_expkey_cache_template = {
+ .owner = THIS_MODULE,
+ .hash_size = EXPKEY_HASHMAX,
+ .name = "nfsd.fh",
+ .cache_put = expkey_put,
+ .cache_request = expkey_request,
+ .cache_parse = expkey_parse,
+ .cache_show = expkey_show,
+ .match = expkey_match,
+ .init = expkey_init,
+ .update = expkey_update,
+ .alloc = expkey_alloc,
+};
+
+static int
+svc_expkey_hash(struct svc_expkey *item)
+{
+ int hash = item->ek_fsidtype;
+ char * cp = (char*)item->ek_fsid;
+ int len = key_len(item->ek_fsidtype);
+
+ hash ^= hash_mem(cp, len, EXPKEY_HASHBITS);
+ hash ^= hash_ptr(item->ek_client, EXPKEY_HASHBITS);
+ hash &= EXPKEY_HASHMASK;
+ return hash;
+}
+
+static struct svc_expkey *
+svc_expkey_lookup(struct cache_detail *cd, struct svc_expkey *item)
+{
+ struct cache_head *ch;
+ int hash = svc_expkey_hash(item);
+
+ ch = sunrpc_cache_lookup(cd, &item->h, hash);
+ if (ch)
+ return container_of(ch, struct svc_expkey, h);
+ else
+ return NULL;
+}
+
+static struct svc_expkey *
+svc_expkey_update(struct cache_detail *cd, struct svc_expkey *new,
+ struct svc_expkey *old)
+{
+ struct cache_head *ch;
+ int hash = svc_expkey_hash(new);
+
+ ch = sunrpc_cache_update(cd, &new->h, &old->h, hash);
+ if (ch)
+ return container_of(ch, struct svc_expkey, h);
+ else
+ return NULL;
+}
+
+
+#define EXPORT_HASHBITS 8
+#define EXPORT_HASHMAX (1<< EXPORT_HASHBITS)
+
+static void nfsd4_fslocs_free(struct nfsd4_fs_locations *fsloc)
+{
+ struct nfsd4_fs_location *locations = fsloc->locations;
+ int i;
+
+ if (!locations)
+ return;
+
+ for (i = 0; i < fsloc->locations_count; i++) {
+ kfree(locations[i].path);
+ kfree(locations[i].hosts);
+ }
+
+ kfree(locations);
+ fsloc->locations = NULL;
+}
+
+static void svc_export_put(struct kref *ref)
+{
+ struct svc_export *exp = container_of(ref, struct svc_export, h.ref);
+ path_put(&exp->ex_path);
+ auth_domain_put(exp->ex_client);
+ nfsd4_fslocs_free(&exp->ex_fslocs);
+ kfree(exp->ex_uuid);
+ kfree(exp);
+}
+
+static void svc_export_request(struct cache_detail *cd,
+ struct cache_head *h,
+ char **bpp, int *blen)
+{
+ /* client path */
+ struct svc_export *exp = container_of(h, struct svc_export, h);
+ char *pth;
+
+ qword_add(bpp, blen, exp->ex_client->name);
+ pth = d_path(&exp->ex_path, *bpp, *blen);
+ if (IS_ERR(pth)) {
+ /* is this correct? */
+ (*bpp)[0] = '\n';
+ return;
+ }
+ qword_add(bpp, blen, pth);
+ (*bpp)[-1] = '\n';
+}
+
+static struct svc_export *svc_export_update(struct svc_export *new,
+ struct svc_export *old);
+static struct svc_export *svc_export_lookup(struct svc_export *);
+
+static int check_export(struct inode *inode, int *flags, unsigned char *uuid)
+{
+
+ /*
+ * We currently export only dirs, regular files, and (for v4
+ * pseudoroot) symlinks.
+ */
+ if (!S_ISDIR(inode->i_mode) &&
+ !S_ISLNK(inode->i_mode) &&
+ !S_ISREG(inode->i_mode))
+ return -ENOTDIR;
+
+ /*
+ * Mountd should never pass down a writeable V4ROOT export, but,
+ * just to make sure:
+ */
+ if (*flags & NFSEXP_V4ROOT)
+ *flags |= NFSEXP_READONLY;
+
+ /* There are two requirements on a filesystem to be exportable.
+ * 1: We must be able to identify the filesystem from a number.
+ * either a device number (so FS_REQUIRES_DEV needed)
+ * or an FSID number (so NFSEXP_FSID or ->uuid is needed).
+ * 2: We must be able to find an inode from a filehandle.
+ * This means that s_export_op must be set.
+ */
+ if (!(inode->i_sb->s_type->fs_flags & FS_REQUIRES_DEV) &&
+ !(*flags & NFSEXP_FSID) &&
+ uuid == NULL) {
+ dprintk("exp_export: export of non-dev fs without fsid\n");
+ return -EINVAL;
+ }
+
+ if (!inode->i_sb->s_export_op ||
+ !inode->i_sb->s_export_op->fh_to_dentry) {
+ dprintk("exp_export: export of invalid fs type.\n");
+ return -EINVAL;
+ }
+
+ return 0;
+
+}
+
+#ifdef CONFIG_NFSD_V4
+
+static int
+fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc)
+{
+ int len;
+ int migrated, i, err;
+
+ /* more than one fsloc */
+ if (fsloc->locations)
+ return -EINVAL;
+
+ /* listsize */
+ err = get_uint(mesg, &fsloc->locations_count);
+ if (err)
+ return err;
+ if (fsloc->locations_count > MAX_FS_LOCATIONS)
+ return -EINVAL;
+ if (fsloc->locations_count == 0)
+ return 0;
+
+ fsloc->locations = kcalloc(fsloc->locations_count,
+ sizeof(struct nfsd4_fs_location),
+ GFP_KERNEL);
+ if (!fsloc->locations)
+ return -ENOMEM;
+ for (i=0; i < fsloc->locations_count; i++) {
+ /* colon separated host list */
+ err = -EINVAL;
+ len = qword_get(mesg, buf, PAGE_SIZE);
+ if (len <= 0)
+ goto out_free_all;
+ err = -ENOMEM;
+ fsloc->locations[i].hosts = kstrdup(buf, GFP_KERNEL);
+ if (!fsloc->locations[i].hosts)
+ goto out_free_all;
+ err = -EINVAL;
+ /* slash separated path component list */
+ len = qword_get(mesg, buf, PAGE_SIZE);
+ if (len <= 0)
+ goto out_free_all;
+ err = -ENOMEM;
+ fsloc->locations[i].path = kstrdup(buf, GFP_KERNEL);
+ if (!fsloc->locations[i].path)
+ goto out_free_all;
+ }
+ /* migrated */
+ err = get_int(mesg, &migrated);
+ if (err)
+ goto out_free_all;
+ err = -EINVAL;
+ if (migrated < 0 || migrated > 1)
+ goto out_free_all;
+ fsloc->migrated = migrated;
+ return 0;
+out_free_all:
+ nfsd4_fslocs_free(fsloc);
+ return err;
+}
+
+static int secinfo_parse(char **mesg, char *buf, struct svc_export *exp)
+{
+ struct exp_flavor_info *f;
+ u32 listsize;
+ int err;
+
+ /* more than one secinfo */
+ if (exp->ex_nflavors)
+ return -EINVAL;
+
+ err = get_uint(mesg, &listsize);
+ if (err)
+ return err;
+ if (listsize > MAX_SECINFO_LIST)
+ return -EINVAL;
+
+ for (f = exp->ex_flavors; f < exp->ex_flavors + listsize; f++) {
+ err = get_uint(mesg, &f->pseudoflavor);
+ if (err)
+ return err;
+ /*
+ * XXX: It would be nice to also check whether this
+ * pseudoflavor is supported, so we can discover the
+ * problem at export time instead of when a client fails
+ * to authenticate.
+ */
+ err = get_uint(mesg, &f->flags);
+ if (err)
+ return err;
+ /* Only some flags are allowed to differ between flavors: */
+ if (~NFSEXP_SECINFO_FLAGS & (f->flags ^ exp->ex_flags))
+ return -EINVAL;
+ }
+ exp->ex_nflavors = listsize;
+ return 0;
+}
+
+#else /* CONFIG_NFSD_V4 */
+static inline int
+fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc){return 0;}
+static inline int
+secinfo_parse(char **mesg, char *buf, struct svc_export *exp) { return 0; }
+#endif
+
+static inline int
+nfsd_uuid_parse(char **mesg, char *buf, unsigned char **puuid)
+{
+ int len;
+
+ /* more than one uuid */
+ if (*puuid)
+ return -EINVAL;
+
+ /* expect a 16 byte uuid encoded as \xXXXX... */
+ len = qword_get(mesg, buf, PAGE_SIZE);
+ if (len != EX_UUID_LEN)
+ return -EINVAL;
+
+ *puuid = kmemdup(buf, EX_UUID_LEN, GFP_KERNEL);
+ if (*puuid == NULL)
+ return -ENOMEM;
+
+ return 0;
+}
+
+static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen)
+{
+ /* client path expiry [flags anonuid anongid fsid] */
+ char *buf;
+ int len;
+ int err;
+ struct auth_domain *dom = NULL;
+ struct svc_export exp = {}, *expp;
+ int an_int;
+
+ if (mesg[mlen-1] != '\n')
+ return -EINVAL;
+ mesg[mlen-1] = 0;
+
+ buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+
+ /* client */
+ err = -EINVAL;
+ len = qword_get(&mesg, buf, PAGE_SIZE);
+ if (len <= 0)
+ goto out;
+
+ err = -ENOENT;
+ dom = auth_domain_find(buf);
+ if (!dom)
+ goto out;
+
+ /* path */
+ err = -EINVAL;
+ if ((len = qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
+ goto out1;
+
+ err = kern_path(buf, 0, &exp.ex_path);
+ if (err)
+ goto out1;
+
+ exp.ex_client = dom;
+ exp.cd = cd;
+ exp.ex_devid_map = NULL;
+
+ /* expiry */
+ err = -EINVAL;
+ exp.h.expiry_time = get_expiry(&mesg);
+ if (exp.h.expiry_time == 0)
+ goto out3;
+
+ /* flags */
+ err = get_int(&mesg, &an_int);
+ if (err == -ENOENT) {
+ err = 0;
+ set_bit(CACHE_NEGATIVE, &exp.h.flags);
+ } else {
+ if (err || an_int < 0)
+ goto out3;
+ exp.ex_flags= an_int;
+
+ /* anon uid */
+ err = get_int(&mesg, &an_int);
+ if (err)
+ goto out3;
+ exp.ex_anon_uid= make_kuid(&init_user_ns, an_int);
+
+ /* anon gid */
+ err = get_int(&mesg, &an_int);
+ if (err)
+ goto out3;
+ exp.ex_anon_gid= make_kgid(&init_user_ns, an_int);
+
+ /* fsid */
+ err = get_int(&mesg, &an_int);
+ if (err)
+ goto out3;
+ exp.ex_fsid = an_int;
+
+ while ((len = qword_get(&mesg, buf, PAGE_SIZE)) > 0) {
+ if (strcmp(buf, "fsloc") == 0)
+ err = fsloc_parse(&mesg, buf, &exp.ex_fslocs);
+ else if (strcmp(buf, "uuid") == 0)
+ err = nfsd_uuid_parse(&mesg, buf, &exp.ex_uuid);
+ else if (strcmp(buf, "secinfo") == 0)
+ err = secinfo_parse(&mesg, buf, &exp);
+ else
+ /* quietly ignore unknown words and anything
+ * following. Newer user-space can try to set
+ * new values, then see what the result was.
+ */
+ break;
+ if (err)
+ goto out4;
+ }
+
+ err = check_export(d_inode(exp.ex_path.dentry), &exp.ex_flags,
+ exp.ex_uuid);
+ if (err)
+ goto out4;
+ /*
+ * No point caching this if it would immediately expire.
+ * Also, this protects exportfs's dummy export from the
+ * anon_uid/anon_gid checks:
+ */
+ if (exp.h.expiry_time < seconds_since_boot())
+ goto out4;
+ /*
+ * For some reason exportfs has been passing down an
+ * invalid (-1) uid & gid on the "dummy" export which it
+ * uses to test export support. To make sure exportfs
+ * sees errors from check_export we therefore need to
+ * delay these checks till after check_export:
+ */
+ err = -EINVAL;
+ if (!uid_valid(exp.ex_anon_uid))
+ goto out4;
+ if (!gid_valid(exp.ex_anon_gid))
+ goto out4;
+ err = 0;
+
+ nfsd4_setup_layout_type(&exp);
+ }
+
+ expp = svc_export_lookup(&exp);
+ if (expp)
+ expp = svc_export_update(&exp, expp);
+ else
+ err = -ENOMEM;
+ cache_flush();
+ if (expp == NULL)
+ err = -ENOMEM;
+ else
+ exp_put(expp);
+out4:
+ nfsd4_fslocs_free(&exp.ex_fslocs);
+ kfree(exp.ex_uuid);
+out3:
+ path_put(&exp.ex_path);
+out1:
+ auth_domain_put(dom);
+out:
+ kfree(buf);
+ return err;
+}
+
+static void exp_flags(struct seq_file *m, int flag, int fsid,
+ kuid_t anonu, kgid_t anong, struct nfsd4_fs_locations *fslocs);
+static void show_secinfo(struct seq_file *m, struct svc_export *exp);
+
+static int svc_export_show(struct seq_file *m,
+ struct cache_detail *cd,
+ struct cache_head *h)
+{
+ struct svc_export *exp ;
+
+ if (h ==NULL) {
+ seq_puts(m, "#path domain(flags)\n");
+ return 0;
+ }
+ exp = container_of(h, struct svc_export, h);
+ seq_path(m, &exp->ex_path, " \t\n\\");
+ seq_putc(m, '\t');
+ seq_escape(m, exp->ex_client->name, " \t\n\\");
+ seq_putc(m, '(');
+ if (test_bit(CACHE_VALID, &h->flags) &&
+ !test_bit(CACHE_NEGATIVE, &h->flags)) {
+ exp_flags(m, exp->ex_flags, exp->ex_fsid,
+ exp->ex_anon_uid, exp->ex_anon_gid, &exp->ex_fslocs);
+ if (exp->ex_uuid) {
+ int i;
+ seq_puts(m, ",uuid=");
+ for (i = 0; i < EX_UUID_LEN; i++) {
+ if ((i&3) == 0 && i)
+ seq_putc(m, ':');
+ seq_printf(m, "%02x", exp->ex_uuid[i]);
+ }
+ }
+ show_secinfo(m, exp);
+ }
+ seq_puts(m, ")\n");
+ return 0;
+}
+static int svc_export_match(struct cache_head *a, struct cache_head *b)
+{
+ struct svc_export *orig = container_of(a, struct svc_export, h);
+ struct svc_export *new = container_of(b, struct svc_export, h);
+ return orig->ex_client == new->ex_client &&
+ path_equal(&orig->ex_path, &new->ex_path);
+}
+
+static void svc_export_init(struct cache_head *cnew, struct cache_head *citem)
+{
+ struct svc_export *new = container_of(cnew, struct svc_export, h);
+ struct svc_export *item = container_of(citem, struct svc_export, h);
+
+ kref_get(&item->ex_client->ref);
+ new->ex_client = item->ex_client;
+ new->ex_path = item->ex_path;
+ path_get(&item->ex_path);
+ new->ex_fslocs.locations = NULL;
+ new->ex_fslocs.locations_count = 0;
+ new->ex_fslocs.migrated = 0;
+ new->ex_layout_types = 0;
+ new->ex_uuid = NULL;
+ new->cd = item->cd;
+}
+
+static void export_update(struct cache_head *cnew, struct cache_head *citem)
+{
+ struct svc_export *new = container_of(cnew, struct svc_export, h);
+ struct svc_export *item = container_of(citem, struct svc_export, h);
+ int i;
+
+ new->ex_flags = item->ex_flags;
+ new->ex_anon_uid = item->ex_anon_uid;
+ new->ex_anon_gid = item->ex_anon_gid;
+ new->ex_fsid = item->ex_fsid;
+ new->ex_devid_map = item->ex_devid_map;
+ item->ex_devid_map = NULL;
+ new->ex_uuid = item->ex_uuid;
+ item->ex_uuid = NULL;
+ new->ex_fslocs.locations = item->ex_fslocs.locations;
+ item->ex_fslocs.locations = NULL;
+ new->ex_fslocs.locations_count = item->ex_fslocs.locations_count;
+ item->ex_fslocs.locations_count = 0;
+ new->ex_fslocs.migrated = item->ex_fslocs.migrated;
+ item->ex_fslocs.migrated = 0;
+ new->ex_layout_types = item->ex_layout_types;
+ new->ex_nflavors = item->ex_nflavors;
+ for (i = 0; i < MAX_SECINFO_LIST; i++) {
+ new->ex_flavors[i] = item->ex_flavors[i];
+ }
+}
+
+static struct cache_head *svc_export_alloc(void)
+{
+ struct svc_export *i = kmalloc(sizeof(*i), GFP_KERNEL);
+ if (i)
+ return &i->h;
+ else
+ return NULL;
+}
+
+static const struct cache_detail svc_export_cache_template = {
+ .owner = THIS_MODULE,
+ .hash_size = EXPORT_HASHMAX,
+ .name = "nfsd.export",
+ .cache_put = svc_export_put,
+ .cache_request = svc_export_request,
+ .cache_parse = svc_export_parse,
+ .cache_show = svc_export_show,
+ .match = svc_export_match,
+ .init = svc_export_init,
+ .update = export_update,
+ .alloc = svc_export_alloc,
+};
+
+static int
+svc_export_hash(struct svc_export *exp)
+{
+ int hash;
+
+ hash = hash_ptr(exp->ex_client, EXPORT_HASHBITS);
+ hash ^= hash_ptr(exp->ex_path.dentry, EXPORT_HASHBITS);
+ hash ^= hash_ptr(exp->ex_path.mnt, EXPORT_HASHBITS);
+ return hash;
+}
+
+static struct svc_export *
+svc_export_lookup(struct svc_export *exp)
+{
+ struct cache_head *ch;
+ int hash = svc_export_hash(exp);
+
+ ch = sunrpc_cache_lookup(exp->cd, &exp->h, hash);
+ if (ch)
+ return container_of(ch, struct svc_export, h);
+ else
+ return NULL;
+}
+
+static struct svc_export *
+svc_export_update(struct svc_export *new, struct svc_export *old)
+{
+ struct cache_head *ch;
+ int hash = svc_export_hash(old);
+
+ ch = sunrpc_cache_update(old->cd, &new->h, &old->h, hash);
+ if (ch)
+ return container_of(ch, struct svc_export, h);
+ else
+ return NULL;
+}
+
+
+static struct svc_expkey *
+exp_find_key(struct cache_detail *cd, struct auth_domain *clp, int fsid_type,
+ u32 *fsidv, struct cache_req *reqp)
+{
+ struct svc_expkey key, *ek;
+ int err;
+
+ if (!clp)
+ return ERR_PTR(-ENOENT);
+
+ key.ek_client = clp;
+ key.ek_fsidtype = fsid_type;
+ memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
+
+ ek = svc_expkey_lookup(cd, &key);
+ if (ek == NULL)
+ return ERR_PTR(-ENOMEM);
+ err = cache_check(cd, &ek->h, reqp);
+ if (err)
+ return ERR_PTR(err);
+ return ek;
+}
+
+static struct svc_export *
+exp_get_by_name(struct cache_detail *cd, struct auth_domain *clp,
+ const struct path *path, struct cache_req *reqp)
+{
+ struct svc_export *exp, key;
+ int err;
+
+ if (!clp)
+ return ERR_PTR(-ENOENT);
+
+ key.ex_client = clp;
+ key.ex_path = *path;
+ key.cd = cd;
+
+ exp = svc_export_lookup(&key);
+ if (exp == NULL)
+ return ERR_PTR(-ENOMEM);
+ err = cache_check(cd, &exp->h, reqp);
+ if (err)
+ return ERR_PTR(err);
+ return exp;
+}
+
+/*
+ * Find the export entry for a given dentry.
+ */
+static struct svc_export *
+exp_parent(struct cache_detail *cd, struct auth_domain *clp, struct path *path)
+{
+ struct dentry *saved = dget(path->dentry);
+ struct svc_export *exp = exp_get_by_name(cd, clp, path, NULL);
+
+ while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) {
+ struct dentry *parent = dget_parent(path->dentry);
+ dput(path->dentry);
+ path->dentry = parent;
+ exp = exp_get_by_name(cd, clp, path, NULL);
+ }
+ dput(path->dentry);
+ path->dentry = saved;
+ return exp;
+}
+
+
+
+/*
+ * Obtain the root fh on behalf of a client.
+ * This could be done in user space, but I feel that it adds some safety
+ * since its harder to fool a kernel module than a user space program.
+ */
+int
+exp_rootfh(struct net *net, struct auth_domain *clp, char *name,
+ struct knfsd_fh *f, int maxsize)
+{
+ struct svc_export *exp;
+ struct path path;
+ struct inode *inode;
+ struct svc_fh fh;
+ int err;
+ struct nfsd_net *nn = net_generic(net, nfsd_net_id);
+ struct cache_detail *cd = nn->svc_export_cache;
+
+ err = -EPERM;
+ /* NB: we probably ought to check that it's NUL-terminated */
+ if (kern_path(name, 0, &path)) {
+ printk("nfsd: exp_rootfh path not found %s", name);
+ return err;
+ }
+ inode = d_inode(path.dentry);
+
+ dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n",
+ name, path.dentry, clp->name,
+ inode->i_sb->s_id, inode->i_ino);
+ exp = exp_parent(cd, clp, &path);
+ if (IS_ERR(exp)) {
+ err = PTR_ERR(exp);
+ goto out;
+ }
+
+ /*
+ * fh must be initialized before calling fh_compose
+ */
+ fh_init(&fh, maxsize);
+ if (fh_compose(&fh, exp, path.dentry, NULL))
+ err = -EINVAL;
+ else
+ err = 0;
+ memcpy(f, &fh.fh_handle, sizeof(struct knfsd_fh));
+ fh_put(&fh);
+ exp_put(exp);
+out:
+ path_put(&path);
+ return err;
+}
+
+static struct svc_export *exp_find(struct cache_detail *cd,
+ struct auth_domain *clp, int fsid_type,
+ u32 *fsidv, struct cache_req *reqp)
+{
+ struct svc_export *exp;
+ struct nfsd_net *nn = net_generic(cd->net, nfsd_net_id);
+ struct svc_expkey *ek = exp_find_key(nn->svc_expkey_cache, clp, fsid_type, fsidv, reqp);
+ if (IS_ERR(ek))
+ return ERR_CAST(ek);
+
+ exp = exp_get_by_name(cd, clp, &ek->ek_path, reqp);
+ cache_put(&ek->h, nn->svc_expkey_cache);
+
+ if (IS_ERR(exp))
+ return ERR_CAST(exp);
+ return exp;
+}
+
+__be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp)
+{
+ struct exp_flavor_info *f;
+ struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
+
+ /* legacy gss-only clients are always OK: */
+ if (exp->ex_client == rqstp->rq_gssclient)
+ return 0;
+ /* ip-address based client; check sec= export option: */
+ for (f = exp->ex_flavors; f < end; f++) {
+ if (f->pseudoflavor == rqstp->rq_cred.cr_flavor)
+ return 0;
+ }
+ /* defaults in absence of sec= options: */
+ if (exp->ex_nflavors == 0) {
+ if (rqstp->rq_cred.cr_flavor == RPC_AUTH_NULL ||
+ rqstp->rq_cred.cr_flavor == RPC_AUTH_UNIX)
+ return 0;
+ }
+
+ /* If the compound op contains a spo_must_allowed op,
+ * it will be sent with integrity/protection which
+ * will have to be expressly allowed on mounts that
+ * don't support it
+ */
+
+ if (nfsd4_spo_must_allow(rqstp))
+ return 0;
+
+ return nfserr_wrongsec;
+}
+
+/*
+ * Uses rq_client and rq_gssclient to find an export; uses rq_client (an
+ * auth_unix client) if it's available and has secinfo information;
+ * otherwise, will try to use rq_gssclient.
+ *
+ * Called from functions that handle requests; functions that do work on
+ * behalf of mountd are passed a single client name to use, and should
+ * use exp_get_by_name() or exp_find().
+ */
+struct svc_export *
+rqst_exp_get_by_name(struct svc_rqst *rqstp, struct path *path)
+{
+ struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
+ struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
+ struct cache_detail *cd = nn->svc_export_cache;
+
+ if (rqstp->rq_client == NULL)
+ goto gss;
+
+ /* First try the auth_unix client: */
+ exp = exp_get_by_name(cd, rqstp->rq_client, path, &rqstp->rq_chandle);
+ if (PTR_ERR(exp) == -ENOENT)
+ goto gss;
+ if (IS_ERR(exp))
+ return exp;
+ /* If it has secinfo, assume there are no gss/... clients */
+ if (exp->ex_nflavors > 0)
+ return exp;
+gss:
+ /* Otherwise, try falling back on gss client */
+ if (rqstp->rq_gssclient == NULL)
+ return exp;
+ gssexp = exp_get_by_name(cd, rqstp->rq_gssclient, path, &rqstp->rq_chandle);
+ if (PTR_ERR(gssexp) == -ENOENT)
+ return exp;
+ if (!IS_ERR(exp))
+ exp_put(exp);
+ return gssexp;
+}
+
+struct svc_export *
+rqst_exp_find(struct svc_rqst *rqstp, int fsid_type, u32 *fsidv)
+{
+ struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
+ struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
+ struct cache_detail *cd = nn->svc_export_cache;
+
+ if (rqstp->rq_client == NULL)
+ goto gss;
+
+ /* First try the auth_unix client: */
+ exp = exp_find(cd, rqstp->rq_client, fsid_type,
+ fsidv, &rqstp->rq_chandle);
+ if (PTR_ERR(exp) == -ENOENT)
+ goto gss;
+ if (IS_ERR(exp))
+ return exp;
+ /* If it has secinfo, assume there are no gss/... clients */
+ if (exp->ex_nflavors > 0)
+ return exp;
+gss:
+ /* Otherwise, try falling back on gss client */
+ if (rqstp->rq_gssclient == NULL)
+ return exp;
+ gssexp = exp_find(cd, rqstp->rq_gssclient, fsid_type, fsidv,
+ &rqstp->rq_chandle);
+ if (PTR_ERR(gssexp) == -ENOENT)
+ return exp;
+ if (!IS_ERR(exp))
+ exp_put(exp);
+ return gssexp;
+}
+
+struct svc_export *
+rqst_exp_parent(struct svc_rqst *rqstp, struct path *path)
+{
+ struct dentry *saved = dget(path->dentry);
+ struct svc_export *exp = rqst_exp_get_by_name(rqstp, path);
+
+ while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) {
+ struct dentry *parent = dget_parent(path->dentry);
+ dput(path->dentry);
+ path->dentry = parent;
+ exp = rqst_exp_get_by_name(rqstp, path);
+ }
+ dput(path->dentry);
+ path->dentry = saved;
+ return exp;
+}
+
+struct svc_export *rqst_find_fsidzero_export(struct svc_rqst *rqstp)
+{
+ u32 fsidv[2];
+
+ mk_fsid(FSID_NUM, fsidv, 0, 0, 0, NULL);
+
+ return rqst_exp_find(rqstp, FSID_NUM, fsidv);
+}
+
+/*
+ * Called when we need the filehandle for the root of the pseudofs,
+ * for a given NFSv4 client. The root is defined to be the
+ * export point with fsid==0
+ */
+__be32
+exp_pseudoroot(struct svc_rqst *rqstp, struct svc_fh *fhp)
+{
+ struct svc_export *exp;
+ __be32 rv;
+
+ exp = rqst_find_fsidzero_export(rqstp);
+ if (IS_ERR(exp))
+ return nfserrno(PTR_ERR(exp));
+ rv = fh_compose(fhp, exp, exp->ex_path.dentry, NULL);
+ exp_put(exp);
+ return rv;
+}
+
+static struct flags {
+ int flag;
+ char *name[2];
+} expflags[] = {
+ { NFSEXP_READONLY, {"ro", "rw"}},
+ { NFSEXP_INSECURE_PORT, {"insecure", ""}},
+ { NFSEXP_ROOTSQUASH, {"root_squash", "no_root_squash"}},
+ { NFSEXP_ALLSQUASH, {"all_squash", ""}},
+ { NFSEXP_ASYNC, {"async", "sync"}},
+ { NFSEXP_GATHERED_WRITES, {"wdelay", "no_wdelay"}},
+ { NFSEXP_NOREADDIRPLUS, {"nordirplus", ""}},
+ { NFSEXP_NOHIDE, {"nohide", ""}},
+ { NFSEXP_CROSSMOUNT, {"crossmnt", ""}},
+ { NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}},
+ { NFSEXP_NOAUTHNLM, {"insecure_locks", ""}},
+ { NFSEXP_V4ROOT, {"v4root", ""}},
+ { NFSEXP_PNFS, {"pnfs", ""}},
+ { NFSEXP_SECURITY_LABEL, {"security_label", ""}},
+ { 0, {"", ""}}
+};
+
+static void show_expflags(struct seq_file *m, int flags, int mask)
+{
+ struct flags *flg;
+ int state, first = 0;
+
+ for (flg = expflags; flg->flag; flg++) {
+ if (flg->flag & ~mask)
+ continue;
+ state = (flg->flag & flags) ? 0 : 1;
+ if (*flg->name[state])
+ seq_printf(m, "%s%s", first++?",":"", flg->name[state]);
+ }
+}
+
+static void show_secinfo_flags(struct seq_file *m, int flags)
+{
+ seq_printf(m, ",");
+ show_expflags(m, flags, NFSEXP_SECINFO_FLAGS);
+}
+
+static bool secinfo_flags_equal(int f, int g)
+{
+ f &= NFSEXP_SECINFO_FLAGS;
+ g &= NFSEXP_SECINFO_FLAGS;
+ return f == g;
+}
+
+static int show_secinfo_run(struct seq_file *m, struct exp_flavor_info **fp, struct exp_flavor_info *end)
+{
+ int flags;
+
+ flags = (*fp)->flags;
+ seq_printf(m, ",sec=%d", (*fp)->pseudoflavor);
+ (*fp)++;
+ while (*fp != end && secinfo_flags_equal(flags, (*fp)->flags)) {
+ seq_printf(m, ":%d", (*fp)->pseudoflavor);
+ (*fp)++;
+ }
+ return flags;
+}
+
+static void show_secinfo(struct seq_file *m, struct svc_export *exp)
+{
+ struct exp_flavor_info *f;
+ struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
+ int flags;
+
+ if (exp->ex_nflavors == 0)
+ return;
+ f = exp->ex_flavors;
+ flags = show_secinfo_run(m, &f, end);
+ if (!secinfo_flags_equal(flags, exp->ex_flags))
+ show_secinfo_flags(m, flags);
+ while (f != end) {
+ flags = show_secinfo_run(m, &f, end);
+ show_secinfo_flags(m, flags);
+ }
+}
+
+static void exp_flags(struct seq_file *m, int flag, int fsid,
+ kuid_t anonu, kgid_t anong, struct nfsd4_fs_locations *fsloc)
+{
+ show_expflags(m, flag, NFSEXP_ALLFLAGS);
+ if (flag & NFSEXP_FSID)
+ seq_printf(m, ",fsid=%d", fsid);
+ if (!uid_eq(anonu, make_kuid(&init_user_ns, (uid_t)-2)) &&
+ !uid_eq(anonu, make_kuid(&init_user_ns, 0x10000-2)))
+ seq_printf(m, ",anonuid=%u", from_kuid(&init_user_ns, anonu));
+ if (!gid_eq(anong, make_kgid(&init_user_ns, (gid_t)-2)) &&
+ !gid_eq(anong, make_kgid(&init_user_ns, 0x10000-2)))
+ seq_printf(m, ",anongid=%u", from_kgid(&init_user_ns, anong));
+ if (fsloc && fsloc->locations_count > 0) {
+ char *loctype = (fsloc->migrated) ? "refer" : "replicas";
+ int i;
+
+ seq_printf(m, ",%s=", loctype);
+ seq_escape(m, fsloc->locations[0].path, ",;@ \t\n\\");
+ seq_putc(m, '@');
+ seq_escape(m, fsloc->locations[0].hosts, ",;@ \t\n\\");
+ for (i = 1; i < fsloc->locations_count; i++) {
+ seq_putc(m, ';');
+ seq_escape(m, fsloc->locations[i].path, ",;@ \t\n\\");
+ seq_putc(m, '@');
+ seq_escape(m, fsloc->locations[i].hosts, ",;@ \t\n\\");
+ }
+ }
+}
+
+static int e_show(struct seq_file *m, void *p)
+{
+ struct cache_head *cp = p;
+ struct svc_export *exp = container_of(cp, struct svc_export, h);
+ struct cache_detail *cd = m->private;
+
+ if (p == SEQ_START_TOKEN) {
+ seq_puts(m, "# Version 1.1\n");
+ seq_puts(m, "# Path Client(Flags) # IPs\n");
+ return 0;
+ }
+
+ exp_get(exp);
+ if (cache_check(cd, &exp->h, NULL))
+ return 0;
+ exp_put(exp);
+ return svc_export_show(m, cd, cp);
+}
+
+const struct seq_operations nfs_exports_op = {
+ .start = cache_seq_start,
+ .next = cache_seq_next,
+ .stop = cache_seq_stop,
+ .show = e_show,
+};
+
+/*
+ * Initialize the exports module.
+ */
+int
+nfsd_export_init(struct net *net)
+{
+ int rv;
+ struct nfsd_net *nn = net_generic(net, nfsd_net_id);
+
+ dprintk("nfsd: initializing export module (net: %x).\n", net->ns.inum);
+
+ nn->svc_export_cache = cache_create_net(&svc_export_cache_template, net);
+ if (IS_ERR(nn->svc_export_cache))
+ return PTR_ERR(nn->svc_export_cache);
+ rv = cache_register_net(nn->svc_export_cache, net);
+ if (rv)
+ goto destroy_export_cache;
+
+ nn->svc_expkey_cache = cache_create_net(&svc_expkey_cache_template, net);
+ if (IS_ERR(nn->svc_expkey_cache)) {
+ rv = PTR_ERR(nn->svc_expkey_cache);
+ goto unregister_export_cache;
+ }
+ rv = cache_register_net(nn->svc_expkey_cache, net);
+ if (rv)
+ goto destroy_expkey_cache;
+ return 0;
+
+destroy_expkey_cache:
+ cache_destroy_net(nn->svc_expkey_cache, net);
+unregister_export_cache:
+ cache_unregister_net(nn->svc_export_cache, net);
+destroy_export_cache:
+ cache_destroy_net(nn->svc_export_cache, net);
+ return rv;
+}
+
+/*
+ * Flush exports table - called when last nfsd thread is killed
+ */
+void
+nfsd_export_flush(struct net *net)
+{
+ struct nfsd_net *nn = net_generic(net, nfsd_net_id);
+
+ cache_purge(nn->svc_expkey_cache);
+ cache_purge(nn->svc_export_cache);
+}
+
+/*
+ * Shutdown the exports module.
+ */
+void
+nfsd_export_shutdown(struct net *net)
+{
+ struct nfsd_net *nn = net_generic(net, nfsd_net_id);
+
+ dprintk("nfsd: shutting down export module (net: %x).\n", net->ns.inum);
+
+ cache_unregister_net(nn->svc_expkey_cache, net);
+ cache_unregister_net(nn->svc_export_cache, net);
+ cache_destroy_net(nn->svc_expkey_cache, net);
+ cache_destroy_net(nn->svc_export_cache, net);
+ svcauth_unix_purge(net);
+
+ dprintk("nfsd: export shutdown complete (net: %x).\n", net->ns.inum);
+}