mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-06 14:06:43 +07:00
b6669737d3
Pull nfsd changes from J Bruce Fields: "Miscellaneous bugfixes, plus: - An overhaul of the DRC cache by Jeff Layton. The main effect is just to make it larger. This decreases the chances of intermittent errors especially in the UDP case. But we'll need to watch for any reports of performance regressions. - Containerized nfsd: with some limitations, we now support per-container nfs-service, thanks to extensive work from Stanislav Kinsbursky over the last year." Some notes about conflicts, since there were *two* non-data semantic conflicts here: - idr_remove_all() had been added by a memory leak fix, but has since become deprecated since idr_destroy() does it for us now. - xs_local_connect() had been added by this branch to make AF_LOCAL connections be synchronous, but in the meantime Trond had changed the calling convention in order to avoid a RCU dereference. There were a couple of more obvious actual source-level conflicts due to the hlist traversal changes and one just due to code changes next to each other, but those were trivial. * 'for-3.9' of git://linux-nfs.org/~bfields/linux: (49 commits) SUNRPC: make AF_LOCAL connect synchronous nfsd: fix compiler warning about ambiguous types in nfsd_cache_csum svcrpc: fix rpc server shutdown races svcrpc: make svc_age_temp_xprts enqueue under sv_lock lockd: nlmclnt_reclaim(): avoid stack overflow nfsd: enable NFSv4 state in containers nfsd: disable usermode helper client tracker in container nfsd: use proper net while reading "exports" file nfsd: containerize NFSd filesystem nfsd: fix comments on nfsd_cache_lookup SUNRPC: move cache_detail->cache_request callback call to cache_read() SUNRPC: remove "cache_request" argument in sunrpc_cache_pipe_upcall() function SUNRPC: rework cache upcall logic SUNRPC: introduce cache_detail->cache_request callback NFS: simplify and clean cache library NFS: use SUNRPC cache creation and destruction helper for DNS cache nfsd4: free_stid can be static nfsd: keep a checksum of the first 256 bytes of request sunrpc: trim off trailing checksum before returning decrypted or integrity authenticated buffer sunrpc: fix comment in struct xdr_buf definition ...
653 lines
16 KiB
C
653 lines
16 KiB
C
/*
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* Mapping of UID/GIDs to name and vice versa.
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*
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* Copyright (c) 2002, 2003 The Regents of the University of
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* Michigan. All rights reserved.
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*
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* Marius Aamodt Eriksen <marius@umich.edu>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <linux/module.h>
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#include <linux/seq_file.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/sunrpc/svc_xprt.h>
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#include <net/net_namespace.h>
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#include "idmap.h"
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#include "nfsd.h"
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#include "netns.h"
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/*
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* Turn off idmapping when using AUTH_SYS.
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*/
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static bool nfs4_disable_idmapping = true;
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module_param(nfs4_disable_idmapping, bool, 0644);
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MODULE_PARM_DESC(nfs4_disable_idmapping,
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"Turn off server's NFSv4 idmapping when using 'sec=sys'");
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/*
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* Cache entry
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*/
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/*
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* XXX we know that IDMAP_NAMESZ < PAGE_SIZE, but it's ugly to rely on
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* that.
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*/
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#define IDMAP_TYPE_USER 0
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#define IDMAP_TYPE_GROUP 1
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struct ent {
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struct cache_head h;
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int type; /* User / Group */
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u32 id;
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char name[IDMAP_NAMESZ];
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char authname[IDMAP_NAMESZ];
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};
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/* Common entry handling */
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#define ENT_HASHBITS 8
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#define ENT_HASHMAX (1 << ENT_HASHBITS)
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static void
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ent_init(struct cache_head *cnew, struct cache_head *citm)
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{
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struct ent *new = container_of(cnew, struct ent, h);
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struct ent *itm = container_of(citm, struct ent, h);
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new->id = itm->id;
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new->type = itm->type;
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strlcpy(new->name, itm->name, sizeof(new->name));
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strlcpy(new->authname, itm->authname, sizeof(new->name));
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}
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static void
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ent_put(struct kref *ref)
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{
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struct ent *map = container_of(ref, struct ent, h.ref);
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kfree(map);
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}
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static struct cache_head *
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ent_alloc(void)
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{
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struct ent *e = kmalloc(sizeof(*e), GFP_KERNEL);
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if (e)
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return &e->h;
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else
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return NULL;
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}
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/*
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* ID -> Name cache
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*/
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static uint32_t
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idtoname_hash(struct ent *ent)
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{
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uint32_t hash;
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hash = hash_str(ent->authname, ENT_HASHBITS);
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hash = hash_long(hash ^ ent->id, ENT_HASHBITS);
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/* Flip LSB for user/group */
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if (ent->type == IDMAP_TYPE_GROUP)
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hash ^= 1;
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return hash;
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}
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static void
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idtoname_request(struct cache_detail *cd, struct cache_head *ch, char **bpp,
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int *blen)
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{
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struct ent *ent = container_of(ch, struct ent, h);
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char idstr[11];
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qword_add(bpp, blen, ent->authname);
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snprintf(idstr, sizeof(idstr), "%u", ent->id);
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qword_add(bpp, blen, ent->type == IDMAP_TYPE_GROUP ? "group" : "user");
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qword_add(bpp, blen, idstr);
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(*bpp)[-1] = '\n';
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}
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static int
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idtoname_match(struct cache_head *ca, struct cache_head *cb)
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{
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struct ent *a = container_of(ca, struct ent, h);
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struct ent *b = container_of(cb, struct ent, h);
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return (a->id == b->id && a->type == b->type &&
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strcmp(a->authname, b->authname) == 0);
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}
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static int
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idtoname_show(struct seq_file *m, struct cache_detail *cd, struct cache_head *h)
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{
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struct ent *ent;
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if (h == NULL) {
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seq_puts(m, "#domain type id [name]\n");
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return 0;
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}
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ent = container_of(h, struct ent, h);
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seq_printf(m, "%s %s %u", ent->authname,
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ent->type == IDMAP_TYPE_GROUP ? "group" : "user",
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ent->id);
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if (test_bit(CACHE_VALID, &h->flags))
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seq_printf(m, " %s", ent->name);
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seq_printf(m, "\n");
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return 0;
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}
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static void
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warn_no_idmapd(struct cache_detail *detail, int has_died)
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{
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printk("nfsd: nfsv4 idmapping failing: has idmapd %s?\n",
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has_died ? "died" : "not been started");
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}
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static int idtoname_parse(struct cache_detail *, char *, int);
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static struct ent *idtoname_lookup(struct cache_detail *, struct ent *);
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static struct ent *idtoname_update(struct cache_detail *, struct ent *,
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struct ent *);
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static struct cache_detail idtoname_cache_template = {
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.owner = THIS_MODULE,
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.hash_size = ENT_HASHMAX,
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.name = "nfs4.idtoname",
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.cache_put = ent_put,
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.cache_request = idtoname_request,
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.cache_parse = idtoname_parse,
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.cache_show = idtoname_show,
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.warn_no_listener = warn_no_idmapd,
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.match = idtoname_match,
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.init = ent_init,
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.update = ent_init,
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.alloc = ent_alloc,
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};
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static int
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idtoname_parse(struct cache_detail *cd, char *buf, int buflen)
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{
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struct ent ent, *res;
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char *buf1, *bp;
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int len;
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int error = -EINVAL;
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if (buf[buflen - 1] != '\n')
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return (-EINVAL);
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buf[buflen - 1]= '\0';
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buf1 = kmalloc(PAGE_SIZE, GFP_KERNEL);
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if (buf1 == NULL)
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return (-ENOMEM);
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memset(&ent, 0, sizeof(ent));
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/* Authentication name */
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if (qword_get(&buf, buf1, PAGE_SIZE) <= 0)
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goto out;
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memcpy(ent.authname, buf1, sizeof(ent.authname));
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/* Type */
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if (qword_get(&buf, buf1, PAGE_SIZE) <= 0)
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goto out;
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ent.type = strcmp(buf1, "user") == 0 ?
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IDMAP_TYPE_USER : IDMAP_TYPE_GROUP;
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/* ID */
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if (qword_get(&buf, buf1, PAGE_SIZE) <= 0)
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goto out;
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ent.id = simple_strtoul(buf1, &bp, 10);
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if (bp == buf1)
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goto out;
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/* expiry */
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ent.h.expiry_time = get_expiry(&buf);
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if (ent.h.expiry_time == 0)
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goto out;
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error = -ENOMEM;
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res = idtoname_lookup(cd, &ent);
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if (!res)
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goto out;
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/* Name */
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error = -EINVAL;
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len = qword_get(&buf, buf1, PAGE_SIZE);
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if (len < 0)
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goto out;
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if (len == 0)
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set_bit(CACHE_NEGATIVE, &ent.h.flags);
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else if (len >= IDMAP_NAMESZ)
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goto out;
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else
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memcpy(ent.name, buf1, sizeof(ent.name));
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error = -ENOMEM;
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res = idtoname_update(cd, &ent, res);
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if (res == NULL)
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goto out;
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cache_put(&res->h, cd);
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error = 0;
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out:
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kfree(buf1);
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return error;
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}
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static struct ent *
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idtoname_lookup(struct cache_detail *cd, struct ent *item)
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{
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struct cache_head *ch = sunrpc_cache_lookup(cd, &item->h,
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idtoname_hash(item));
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if (ch)
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return container_of(ch, struct ent, h);
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else
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return NULL;
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}
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static struct ent *
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idtoname_update(struct cache_detail *cd, struct ent *new, struct ent *old)
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{
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struct cache_head *ch = sunrpc_cache_update(cd, &new->h, &old->h,
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idtoname_hash(new));
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if (ch)
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return container_of(ch, struct ent, h);
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else
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return NULL;
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}
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/*
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* Name -> ID cache
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*/
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static inline int
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nametoid_hash(struct ent *ent)
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{
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return hash_str(ent->name, ENT_HASHBITS);
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}
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static void
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nametoid_request(struct cache_detail *cd, struct cache_head *ch, char **bpp,
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int *blen)
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{
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struct ent *ent = container_of(ch, struct ent, h);
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qword_add(bpp, blen, ent->authname);
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qword_add(bpp, blen, ent->type == IDMAP_TYPE_GROUP ? "group" : "user");
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qword_add(bpp, blen, ent->name);
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(*bpp)[-1] = '\n';
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}
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static int
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nametoid_match(struct cache_head *ca, struct cache_head *cb)
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{
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struct ent *a = container_of(ca, struct ent, h);
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struct ent *b = container_of(cb, struct ent, h);
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return (a->type == b->type && strcmp(a->name, b->name) == 0 &&
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strcmp(a->authname, b->authname) == 0);
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}
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static int
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nametoid_show(struct seq_file *m, struct cache_detail *cd, struct cache_head *h)
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{
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struct ent *ent;
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if (h == NULL) {
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seq_puts(m, "#domain type name [id]\n");
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return 0;
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}
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ent = container_of(h, struct ent, h);
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seq_printf(m, "%s %s %s", ent->authname,
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ent->type == IDMAP_TYPE_GROUP ? "group" : "user",
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ent->name);
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if (test_bit(CACHE_VALID, &h->flags))
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seq_printf(m, " %u", ent->id);
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seq_printf(m, "\n");
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return 0;
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}
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static struct ent *nametoid_lookup(struct cache_detail *, struct ent *);
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static struct ent *nametoid_update(struct cache_detail *, struct ent *,
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struct ent *);
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static int nametoid_parse(struct cache_detail *, char *, int);
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static struct cache_detail nametoid_cache_template = {
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.owner = THIS_MODULE,
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.hash_size = ENT_HASHMAX,
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.name = "nfs4.nametoid",
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.cache_put = ent_put,
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.cache_request = nametoid_request,
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.cache_parse = nametoid_parse,
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.cache_show = nametoid_show,
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.warn_no_listener = warn_no_idmapd,
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.match = nametoid_match,
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.init = ent_init,
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.update = ent_init,
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.alloc = ent_alloc,
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};
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static int
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nametoid_parse(struct cache_detail *cd, char *buf, int buflen)
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{
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struct ent ent, *res;
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char *buf1;
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int error = -EINVAL;
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if (buf[buflen - 1] != '\n')
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return (-EINVAL);
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buf[buflen - 1]= '\0';
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buf1 = kmalloc(PAGE_SIZE, GFP_KERNEL);
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if (buf1 == NULL)
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return (-ENOMEM);
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memset(&ent, 0, sizeof(ent));
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/* Authentication name */
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if (qword_get(&buf, buf1, PAGE_SIZE) <= 0)
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goto out;
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memcpy(ent.authname, buf1, sizeof(ent.authname));
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/* Type */
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if (qword_get(&buf, buf1, PAGE_SIZE) <= 0)
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goto out;
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ent.type = strcmp(buf1, "user") == 0 ?
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IDMAP_TYPE_USER : IDMAP_TYPE_GROUP;
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/* Name */
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error = qword_get(&buf, buf1, PAGE_SIZE);
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if (error <= 0 || error >= IDMAP_NAMESZ)
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goto out;
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memcpy(ent.name, buf1, sizeof(ent.name));
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/* expiry */
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ent.h.expiry_time = get_expiry(&buf);
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if (ent.h.expiry_time == 0)
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goto out;
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/* ID */
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error = get_int(&buf, &ent.id);
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if (error == -EINVAL)
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goto out;
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if (error == -ENOENT)
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set_bit(CACHE_NEGATIVE, &ent.h.flags);
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error = -ENOMEM;
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res = nametoid_lookup(cd, &ent);
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if (res == NULL)
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goto out;
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res = nametoid_update(cd, &ent, res);
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if (res == NULL)
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goto out;
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cache_put(&res->h, cd);
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error = 0;
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out:
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kfree(buf1);
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return (error);
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}
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static struct ent *
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nametoid_lookup(struct cache_detail *cd, struct ent *item)
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{
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struct cache_head *ch = sunrpc_cache_lookup(cd, &item->h,
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nametoid_hash(item));
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if (ch)
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return container_of(ch, struct ent, h);
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else
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return NULL;
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}
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static struct ent *
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nametoid_update(struct cache_detail *cd, struct ent *new, struct ent *old)
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{
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struct cache_head *ch = sunrpc_cache_update(cd, &new->h, &old->h,
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nametoid_hash(new));
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if (ch)
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return container_of(ch, struct ent, h);
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else
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return NULL;
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}
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/*
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* Exported API
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*/
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int
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nfsd_idmap_init(struct net *net)
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{
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int rv;
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struct nfsd_net *nn = net_generic(net, nfsd_net_id);
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nn->idtoname_cache = cache_create_net(&idtoname_cache_template, net);
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if (IS_ERR(nn->idtoname_cache))
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return PTR_ERR(nn->idtoname_cache);
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rv = cache_register_net(nn->idtoname_cache, net);
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if (rv)
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goto destroy_idtoname_cache;
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nn->nametoid_cache = cache_create_net(&nametoid_cache_template, net);
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if (IS_ERR(nn->nametoid_cache)) {
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rv = PTR_ERR(nn->nametoid_cache);
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goto unregister_idtoname_cache;
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}
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rv = cache_register_net(nn->nametoid_cache, net);
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if (rv)
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goto destroy_nametoid_cache;
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return 0;
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destroy_nametoid_cache:
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cache_destroy_net(nn->nametoid_cache, net);
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unregister_idtoname_cache:
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cache_unregister_net(nn->idtoname_cache, net);
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destroy_idtoname_cache:
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cache_destroy_net(nn->idtoname_cache, net);
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return rv;
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}
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|
|
void
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|
nfsd_idmap_shutdown(struct net *net)
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{
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struct nfsd_net *nn = net_generic(net, nfsd_net_id);
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cache_unregister_net(nn->idtoname_cache, net);
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cache_unregister_net(nn->nametoid_cache, net);
|
|
cache_destroy_net(nn->idtoname_cache, net);
|
|
cache_destroy_net(nn->nametoid_cache, net);
|
|
}
|
|
|
|
static int
|
|
idmap_lookup(struct svc_rqst *rqstp,
|
|
struct ent *(*lookup_fn)(struct cache_detail *, struct ent *),
|
|
struct ent *key, struct cache_detail *detail, struct ent **item)
|
|
{
|
|
int ret;
|
|
|
|
*item = lookup_fn(detail, key);
|
|
if (!*item)
|
|
return -ENOMEM;
|
|
retry:
|
|
ret = cache_check(detail, &(*item)->h, &rqstp->rq_chandle);
|
|
|
|
if (ret == -ETIMEDOUT) {
|
|
struct ent *prev_item = *item;
|
|
*item = lookup_fn(detail, key);
|
|
if (*item != prev_item)
|
|
goto retry;
|
|
cache_put(&(*item)->h, detail);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static char *
|
|
rqst_authname(struct svc_rqst *rqstp)
|
|
{
|
|
struct auth_domain *clp;
|
|
|
|
clp = rqstp->rq_gssclient ? rqstp->rq_gssclient : rqstp->rq_client;
|
|
return clp->name;
|
|
}
|
|
|
|
static __be32
|
|
idmap_name_to_id(struct svc_rqst *rqstp, int type, const char *name, u32 namelen,
|
|
u32 *id)
|
|
{
|
|
struct ent *item, key = {
|
|
.type = type,
|
|
};
|
|
int ret;
|
|
struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
|
|
|
|
if (namelen + 1 > sizeof(key.name))
|
|
return nfserr_badowner;
|
|
memcpy(key.name, name, namelen);
|
|
key.name[namelen] = '\0';
|
|
strlcpy(key.authname, rqst_authname(rqstp), sizeof(key.authname));
|
|
ret = idmap_lookup(rqstp, nametoid_lookup, &key, nn->nametoid_cache, &item);
|
|
if (ret == -ENOENT)
|
|
return nfserr_badowner;
|
|
if (ret)
|
|
return nfserrno(ret);
|
|
*id = item->id;
|
|
cache_put(&item->h, nn->nametoid_cache);
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
idmap_id_to_name(struct svc_rqst *rqstp, int type, u32 id, char *name)
|
|
{
|
|
struct ent *item, key = {
|
|
.id = id,
|
|
.type = type,
|
|
};
|
|
int ret;
|
|
struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
|
|
|
|
strlcpy(key.authname, rqst_authname(rqstp), sizeof(key.authname));
|
|
ret = idmap_lookup(rqstp, idtoname_lookup, &key, nn->idtoname_cache, &item);
|
|
if (ret == -ENOENT)
|
|
return sprintf(name, "%u", id);
|
|
if (ret)
|
|
return ret;
|
|
ret = strlen(item->name);
|
|
BUG_ON(ret > IDMAP_NAMESZ);
|
|
memcpy(name, item->name, ret);
|
|
cache_put(&item->h, nn->idtoname_cache);
|
|
return ret;
|
|
}
|
|
|
|
static bool
|
|
numeric_name_to_id(struct svc_rqst *rqstp, int type, const char *name, u32 namelen, u32 *id)
|
|
{
|
|
int ret;
|
|
char buf[11];
|
|
|
|
if (namelen + 1 > sizeof(buf))
|
|
/* too long to represent a 32-bit id: */
|
|
return false;
|
|
/* Just to make sure it's null-terminated: */
|
|
memcpy(buf, name, namelen);
|
|
buf[namelen] = '\0';
|
|
ret = kstrtouint(buf, 10, id);
|
|
return ret == 0;
|
|
}
|
|
|
|
static __be32
|
|
do_name_to_id(struct svc_rqst *rqstp, int type, const char *name, u32 namelen, u32 *id)
|
|
{
|
|
if (nfs4_disable_idmapping && rqstp->rq_cred.cr_flavor < RPC_AUTH_GSS)
|
|
if (numeric_name_to_id(rqstp, type, name, namelen, id))
|
|
return 0;
|
|
/*
|
|
* otherwise, fall through and try idmapping, for
|
|
* backwards compatibility with clients sending names:
|
|
*/
|
|
return idmap_name_to_id(rqstp, type, name, namelen, id);
|
|
}
|
|
|
|
static int
|
|
do_id_to_name(struct svc_rqst *rqstp, int type, u32 id, char *name)
|
|
{
|
|
if (nfs4_disable_idmapping && rqstp->rq_cred.cr_flavor < RPC_AUTH_GSS)
|
|
return sprintf(name, "%u", id);
|
|
return idmap_id_to_name(rqstp, type, id, name);
|
|
}
|
|
|
|
__be32
|
|
nfsd_map_name_to_uid(struct svc_rqst *rqstp, const char *name, size_t namelen,
|
|
kuid_t *uid)
|
|
{
|
|
__be32 status;
|
|
u32 id = -1;
|
|
status = do_name_to_id(rqstp, IDMAP_TYPE_USER, name, namelen, &id);
|
|
*uid = make_kuid(&init_user_ns, id);
|
|
if (!uid_valid(*uid))
|
|
status = nfserr_badowner;
|
|
return status;
|
|
}
|
|
|
|
__be32
|
|
nfsd_map_name_to_gid(struct svc_rqst *rqstp, const char *name, size_t namelen,
|
|
kgid_t *gid)
|
|
{
|
|
__be32 status;
|
|
u32 id = -1;
|
|
status = do_name_to_id(rqstp, IDMAP_TYPE_GROUP, name, namelen, &id);
|
|
*gid = make_kgid(&init_user_ns, id);
|
|
if (!gid_valid(*gid))
|
|
status = nfserr_badowner;
|
|
return status;
|
|
}
|
|
|
|
int
|
|
nfsd_map_uid_to_name(struct svc_rqst *rqstp, kuid_t uid, char *name)
|
|
{
|
|
u32 id = from_kuid(&init_user_ns, uid);
|
|
return do_id_to_name(rqstp, IDMAP_TYPE_USER, id, name);
|
|
}
|
|
|
|
int
|
|
nfsd_map_gid_to_name(struct svc_rqst *rqstp, kgid_t gid, char *name)
|
|
{
|
|
u32 id = from_kgid(&init_user_ns, gid);
|
|
return do_id_to_name(rqstp, IDMAP_TYPE_GROUP, id, name);
|
|
}
|