| // 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" |
| #include "filecache.h" |
| #include "trace.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_work(struct work_struct *work) |
| { |
| struct svc_expkey *key = |
| container_of(to_rcu_work(work), struct svc_expkey, ek_rcu_work); |
| |
| 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_put(struct kref *ref) |
| { |
| struct svc_expkey *key = container_of(ref, struct svc_expkey, h.ref); |
| |
| INIT_RCU_WORK(&key->ek_rcu_work, expkey_put_work); |
| queue_rcu_work(system_wq, &key->ek_rcu_work); |
| } |
| |
| static int expkey_upcall(struct cache_detail *cd, struct cache_head *h) |
| { |
| return sunrpc_cache_pipe_upcall(cd, h); |
| } |
| |
| 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 (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 (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; |
| err = get_expiry(&mesg, &key.h.expiry_time); |
| if (err) |
| 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) |
| trace_nfsd_expkey_update(ek, NULL); |
| else |
| 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) |
| trace_nfsd_expkey_update(ek, buf); |
| else |
| 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 void expkey_flush(void) |
| { |
| /* |
| * Take the nfsd_mutex here to ensure that the file cache is not |
| * destroyed while we're in the middle of flushing. |
| */ |
| mutex_lock(&nfsd_mutex); |
| nfsd_file_cache_purge(current->nsproxy->net_ns); |
| mutex_unlock(&nfsd_mutex); |
| } |
| |
| static const struct cache_detail svc_expkey_cache_template = { |
| .owner = THIS_MODULE, |
| .hash_size = EXPKEY_HASHMAX, |
| .name = "nfsd.fh", |
| .cache_put = expkey_put, |
| .cache_upcall = expkey_upcall, |
| .cache_request = expkey_request, |
| .cache_parse = expkey_parse, |
| .cache_show = expkey_show, |
| .match = expkey_match, |
| .init = expkey_init, |
| .update = expkey_update, |
| .alloc = expkey_alloc, |
| .flush = expkey_flush, |
| }; |
| |
| 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_rcu(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 int export_stats_init(struct export_stats *stats) |
| { |
| stats->start_time = ktime_get_seconds(); |
| return percpu_counter_init_many(stats->counter, 0, GFP_KERNEL, |
| EXP_STATS_COUNTERS_NUM); |
| } |
| |
| static void export_stats_reset(struct export_stats *stats) |
| { |
| if (stats) { |
| int i; |
| |
| for (i = 0; i < EXP_STATS_COUNTERS_NUM; i++) |
| percpu_counter_set(&stats->counter[i], 0); |
| } |
| } |
| |
| static void export_stats_destroy(struct export_stats *stats) |
| { |
| if (stats) |
| percpu_counter_destroy_many(stats->counter, |
| EXP_STATS_COUNTERS_NUM); |
| } |
| |
| static void svc_export_put_work(struct work_struct *work) |
| { |
| struct svc_export *exp = |
| container_of(to_rcu_work(work), struct svc_export, ex_rcu_work); |
| |
| path_put(&exp->ex_path); |
| auth_domain_put(exp->ex_client); |
| nfsd4_fslocs_free(&exp->ex_fslocs); |
| export_stats_destroy(exp->ex_stats); |
| kfree(exp->ex_stats); |
| kfree(exp->ex_uuid); |
| kfree(exp); |
| } |
| |
| static void svc_export_put(struct kref *ref) |
| { |
| struct svc_export *exp = container_of(ref, struct svc_export, h.ref); |
| |
| INIT_RCU_WORK(&exp->ex_rcu_work, svc_export_put_work); |
| queue_rcu_work(system_wq, &exp->ex_rcu_work); |
| } |
| |
| static int svc_export_upcall(struct cache_detail *cd, struct cache_head *h) |
| { |
| return sunrpc_cache_pipe_upcall(cd, h); |
| } |
| |
| 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 path *path, int *flags, unsigned char *uuid) |
| { |
| struct inode *inode = d_inode(path->dentry); |
| |
| /* |
| * 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. |
| * 3: We must not currently be on an idmapped mount. |
| */ |
| 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 (!exportfs_can_decode_fh(inode->i_sb->s_export_op)) { |
| dprintk("exp_export: export of invalid fs type.\n"); |
| return -EINVAL; |
| } |
| |
| if (is_idmapped_mnt(path->mnt)) { |
| dprintk("exp_export: export of idmapped mounts not yet supported.\n"); |
| return -EINVAL; |
| } |
| |
| if (inode->i_sb->s_export_op->flags & EXPORT_OP_NOSUBTREECHK && |
| !(*flags & NFSEXP_NOSUBTREECHECK)) { |
| dprintk("%s: %s does not support subtree checking!\n", |
| __func__, inode->i_sb->s_type->name); |
| 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 int xprtsec_parse(char **mesg, char *buf, struct svc_export *exp) |
| { |
| unsigned int i, mode, listsize; |
| int err; |
| |
| err = get_uint(mesg, &listsize); |
| if (err) |
| return err; |
| if (listsize > NFSEXP_XPRTSEC_NUM) |
| return -EINVAL; |
| |
| exp->ex_xprtsec_modes = 0; |
| for (i = 0; i < listsize; i++) { |
| err = get_uint(mesg, &mode); |
| if (err) |
| return err; |
| if (mode > NFSEXP_XPRTSEC_MTLS) |
| return -EINVAL; |
| exp->ex_xprtsec_modes |= mode; |
| } |
| return 0; |
| } |
| |
| 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 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; |
| if (qword_get(&mesg, buf, PAGE_SIZE) <= 0) |
| goto out; |
| |
| err = -ENOENT; |
| dom = auth_domain_find(buf); |
| if (!dom) |
| goto out; |
| |
| /* path */ |
| err = -EINVAL; |
| if (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; |
| exp.ex_xprtsec_modes = NFSEXP_XPRTSEC_ALL; |
| |
| /* expiry */ |
| err = get_expiry(&mesg, &exp.h.expiry_time); |
| if (err) |
| 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(current_user_ns(), an_int); |
| |
| /* anon gid */ |
| err = get_int(&mesg, &an_int); |
| if (err) |
| goto out3; |
| exp.ex_anon_gid= make_kgid(current_user_ns(), an_int); |
| |
| /* fsid */ |
| err = get_int(&mesg, &an_int); |
| if (err) |
| goto out3; |
| exp.ex_fsid = an_int; |
| |
| while (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 if (strcmp(buf, "xprtsec") == 0) |
| err = xprtsec_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(&exp.ex_path, &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) { |
| err = -ENOMEM; |
| goto out4; |
| } |
| expp = svc_export_update(&exp, expp); |
| if (expp) { |
| trace_nfsd_export_update(expp); |
| cache_flush(); |
| exp_put(expp); |
| } else |
| err = -ENOMEM; |
| 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 is_export_stats_file(struct seq_file *m) |
| { |
| /* |
| * The export_stats file uses the same ops as the exports file. |
| * We use the file's name to determine the reported info per export. |
| * There is no rename in nsfdfs, so d_name.name is stable. |
| */ |
| return !strcmp(m->file->f_path.dentry->d_name.name, "export_stats"); |
| } |
| |
| static int svc_export_show(struct seq_file *m, |
| struct cache_detail *cd, |
| struct cache_head *h) |
| { |
| struct svc_export *exp; |
| bool export_stats = is_export_stats_file(m); |
| |
| if (h == NULL) { |
| if (export_stats) |
| seq_puts(m, "#path domain start-time\n#\tstats\n"); |
| else |
| 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\\"); |
| if (export_stats) { |
| struct percpu_counter *counter = exp->ex_stats->counter; |
| |
| seq_printf(m, "\t%lld\n", exp->ex_stats->start_time); |
| seq_printf(m, "\tfh_stale: %lld\n", |
| percpu_counter_sum_positive(&counter[EXP_STATS_FH_STALE])); |
| seq_printf(m, "\tio_read: %lld\n", |
| percpu_counter_sum_positive(&counter[EXP_STATS_IO_READ])); |
| seq_printf(m, "\tio_write: %lld\n", |
| percpu_counter_sum_positive(&counter[EXP_STATS_IO_WRITE])); |
| seq_putc(m, '\n'); |
| return 0; |
| } |
| 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; |
| export_stats_reset(new->ex_stats); |
| } |
| |
| 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]; |
| } |
| new->ex_xprtsec_modes = item->ex_xprtsec_modes; |
| } |
| |
| static struct cache_head *svc_export_alloc(void) |
| { |
| struct svc_export *i = kmalloc(sizeof(*i), GFP_KERNEL); |
| if (!i) |
| return NULL; |
| |
| i->ex_stats = kmalloc(sizeof(*(i->ex_stats)), GFP_KERNEL); |
| if (!i->ex_stats) { |
| kfree(i); |
| return NULL; |
| } |
| |
| if (export_stats_init(i->ex_stats)) { |
| kfree(i->ex_stats); |
| kfree(i); |
| return NULL; |
| } |
| |
| return &i->h; |
| } |
| |
| 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_upcall = svc_export_upcall, |
| .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_rcu(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) { |
| trace_nfsd_exp_find_key(&key, 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) { |
| trace_nfsd_exp_get_by_name(&key, 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; |
| } |
| |
| /** |
| * check_nfsd_access - check if access to export is allowed. |
| * @exp: svc_export that is being accessed. |
| * @rqstp: svc_rqst attempting to access @exp (will be NULL for LOCALIO). |
| * @may_bypass_gss: reduce strictness of authorization check |
| * |
| * Return values: |
| * %nfs_ok if access is granted, or |
| * %nfserr_wrongsec if access is denied |
| */ |
| __be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp, |
| bool may_bypass_gss) |
| { |
| struct exp_flavor_info *f, *end = exp->ex_flavors + exp->ex_nflavors; |
| struct svc_xprt *xprt; |
| |
| /* |
| * If rqstp is NULL, this is a LOCALIO request which will only |
| * ever use a filehandle/credential pair for which access has |
| * been affirmed (by ACCESS or OPEN NFS requests) over the |
| * wire. So there is no need for further checks here. |
| */ |
| if (!rqstp) |
| return nfs_ok; |
| |
| xprt = rqstp->rq_xprt; |
| |
| if (exp->ex_xprtsec_modes & NFSEXP_XPRTSEC_NONE) { |
| if (!test_bit(XPT_TLS_SESSION, &xprt->xpt_flags)) |
| goto ok; |
| } |
| if (exp->ex_xprtsec_modes & NFSEXP_XPRTSEC_TLS) { |
| if (test_bit(XPT_TLS_SESSION, &xprt->xpt_flags) && |
| !test_bit(XPT_PEER_AUTH, &xprt->xpt_flags)) |
| goto ok; |
| } |
| if (exp->ex_xprtsec_modes & NFSEXP_XPRTSEC_MTLS) { |
| if (test_bit(XPT_TLS_SESSION, &xprt->xpt_flags) && |
| test_bit(XPT_PEER_AUTH, &xprt->xpt_flags)) |
| goto ok; |
| } |
| goto denied; |
| |
| ok: |
| /* legacy gss-only clients are always OK: */ |
| if (exp->ex_client == rqstp->rq_gssclient) |
| return nfs_ok; |
| /* 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 nfs_ok; |
| } |
| /* 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 nfs_ok; |
| } |
| |
| /* 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 nfs_ok; |
| |
| /* Some calls may be processed without authentication |
| * on GSS exports. For example NFS2/3 calls on root |
| * directory, see section 2.3.2 of rfc 2623. |
| * For "may_bypass_gss" check that export has really |
| * enabled some flavor with authentication (GSS or any |
| * other) and also check that the used auth flavor is |
| * without authentication (none or sys). |
| */ |
| if (may_bypass_gss && ( |
| rqstp->rq_cred.cr_flavor == RPC_AUTH_NULL || |
| rqstp->rq_cred.cr_flavor == RPC_AUTH_UNIX)) { |
| for (f = exp->ex_flavors; f < end; f++) { |
| if (f->pseudoflavor >= RPC_AUTH_DES) |
| return 0; |
| } |
| } |
| |
| denied: |
| 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; |
| } |
| |
| /** |
| * rqst_exp_find - Find an svc_export in the context of a rqst or similar |
| * @reqp: The handle to be used to suspend the request if a cache-upcall is needed |
| * If NULL, missing in-cache information will result in failure. |
| * @net: The network namespace in which the request exists |
| * @cl: default auth_domain to use for looking up the export |
| * @gsscl: an alternate auth_domain defined using deprecated gss/krb5 format. |
| * @fsid_type: The type of fsid to look for |
| * @fsidv: The actual fsid to look up in the context of either client. |
| * |
| * Perform a lookup for @cl/@fsidv in the given @net for an export. If |
| * none found and @gsscl specified, repeat the lookup. |
| * |
| * Returns an export, or an error pointer. |
| */ |
| struct svc_export * |
| rqst_exp_find(struct cache_req *reqp, struct net *net, |
| struct auth_domain *cl, struct auth_domain *gsscl, |
| int fsid_type, u32 *fsidv) |
| { |
| struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
| struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT); |
| struct cache_detail *cd = nn->svc_export_cache; |
| |
| if (!cl) |
| goto gss; |
| |
| /* First try the auth_unix client: */ |
| exp = exp_find(cd, cl, fsid_type, fsidv, reqp); |
| 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 (!gsscl) |
| return exp; |
| gssexp = exp_find(cd, gsscl, fsid_type, fsidv, reqp); |
| 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->rq_chandle, SVC_NET(rqstp), |
| rqstp->rq_client, rqstp->rq_gssclient, |
| 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) |
| { |
| struct user_namespace *userns = m->file->f_cred->user_ns; |
| |
| show_expflags(m, flag, NFSEXP_ALLFLAGS); |
| if (flag & NFSEXP_FSID) |
| seq_printf(m, ",fsid=%d", fsid); |
| if (!uid_eq(anonu, make_kuid(userns, (uid_t)-2)) && |
| !uid_eq(anonu, make_kuid(userns, 0x10000-2))) |
| seq_printf(m, ",anonuid=%u", from_kuid_munged(userns, anonu)); |
| if (!gid_eq(anong, make_kgid(userns, (gid_t)-2)) && |
| !gid_eq(anong, make_kgid(userns, 0x10000-2))) |
| seq_printf(m, ",anongid=%u", from_kgid_munged(userns, 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; |
| bool export_stats = is_export_stats_file(m); |
| |
| if (p == SEQ_START_TOKEN) { |
| seq_puts(m, "# Version 1.1\n"); |
| if (export_stats) |
| seq_puts(m, "# Path Client Start-time\n#\tStats\n"); |
| else |
| seq_puts(m, "# Path Client(Flags) # IPs\n"); |
| return 0; |
| } |
| |
| if (!cache_get_rcu(&exp->h)) |
| return 0; |
| |
| 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_rcu, |
| .next = cache_seq_next_rcu, |
| .stop = cache_seq_stop_rcu, |
| .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); |
| } |