Commit 4a2d7892 authored by Wang Lei's avatar Wang Lei Committed by Steve French
Browse files

DNS: If the DNS server returns an error, allow that to be cached [ver #2] 



If the DNS server returns an error, allow that to be cached in the DNS resolver
key in lieu of a value.  Userspace passes the desired error number as an option
in the payload:

	"#dnserror=<number>"

Userspace must map h_errno from the name resolution routines to an appropriate
Linux error before passing it up.  Something like the following mapping is
recommended:

	[HOST_NOT_FOUND]	= ENODATA,
	[TRY_AGAIN]		= EAGAIN,
	[NO_RECOVERY]		= ECONNREFUSED,
	[NO_DATA]		= ENODATA,

in lieu of Linux errors specifically for representing name service errors.  The
filesystem must map these errors appropropriately before passing them to
userspace.  AFS is made to map ENODATA and EAGAIN to EDESTADDRREQ for the
return to userspace; ECONNREFUSED is allowed to stand as is.

The error can be seen in /proc/keys as a negative number after the description
of the key.  Compare, for example, the following key entries:

2f97238c I--Q--     1  53s 3f010000     0     0 dns_resol afsdb:grand.centrall.org: -61
338bfbbe I--Q--     1  59m 3f010000     0     0 dns_resol afsdb:grand.central.org: 37

If the error option is supplied in the payload, the main part of the payload is
discarded.  The key should have an expiry time set by userspace.

Signed-off-by: default avatarWang Lei <wang840925@gmail.com>
Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
Acked-by: default avatarJeff Layton <jlayton@redhat.com>
Signed-off-by: default avatarSteve French <sfrench@us.ibm.com>
parent c2e8139c

fs/afs/cell.c

+4 −0
Original line number Diff line number Diff line
@@ -73,6 +73,10 @@ static struct afs_cell *afs_cell_alloc(const char *name, char *vllist) 
	if (!vllist || strlen(vllist) < 7) {

		ret = dns_query("afsdb", name, namelen, "ipv4", &dvllist, NULL);

		if (ret < 0) {

			if (ret == -ENODATA || ret == -EAGAIN || ret == -ENOKEY)

				/* translate these errors into something

				 * userspace might understand */

				ret = -EDESTADDRREQ;

			_leave(" = %d", ret);

			return ERR_PTR(ret);

		}

net/dns_resolver/dns_key.c

+87 −5
Original line number Diff line number Diff line
@@ -29,6 +29,7 @@ 
#include <linux/kernel.h>

#include <linux/keyctl.h>

#include <linux/err.h>

#include <linux/seq_file.h>

#include <keys/dns_resolver-type.h>

#include <keys/user-type.h>

#include "internal.h"
@@ -43,6 +44,8 @@ MODULE_PARM_DESC(debug, "DNS Resolver debugging mask"); 


const struct cred *dns_resolver_cache;



#define	DNS_ERRORNO_OPTION	"dnserror"



/*

 * Instantiate a user defined key for dns_resolver.

 *
@@ -59,9 +62,10 @@ static int 
dns_resolver_instantiate(struct key *key, const void *_data, size_t datalen)

{

	struct user_key_payload *upayload;

	unsigned long derrno;

	int ret;

	size_t result_len = 0;

	const char *data = _data, *opt;

	const char *data = _data, *end, *opt;



	kenter("%%%d,%s,'%s',%zu",

	       key->serial, key->description, data, datalen);
@@ -71,13 +75,77 @@ dns_resolver_instantiate(struct key *key, const void *_data, size_t datalen) 
	datalen--;



	/* deal with any options embedded in the data */

	end = data + datalen;

	opt = memchr(data, '#', datalen);

	if (!opt) {

		kdebug("no options currently supported");

		/* no options: the entire data is the result */

		kdebug("no options");

		result_len = datalen;

	} else {

		const char *next_opt;



		result_len = opt - data;

		opt++;

		kdebug("options: '%s'", opt);

		do {

			const char *eq;

			int opt_len, opt_nlen, opt_vlen, tmp;



			next_opt = memchr(opt, '#', end - opt) ?: end;

			opt_len = next_opt - opt;

			if (!opt_len) {

				printk(KERN_WARNING

				       "Empty option to dns_resolver key %d\n",

				       key->serial);

				return -EINVAL;

			}



	result_len = datalen;

			eq = memchr(opt, '=', opt_len) ?: end;

			opt_nlen = eq - opt;

			eq++;

			opt_vlen = next_opt - eq; /* will be -1 if no value */



			tmp = opt_vlen >= 0 ? opt_vlen : 0;

			kdebug("option '%*.*s' val '%*.*s'",

			       opt_nlen, opt_nlen, opt, tmp, tmp, eq);



			/* see if it's an error number representing a DNS error

			 * that's to be recorded as the result in this key */

			if (opt_nlen == sizeof(DNS_ERRORNO_OPTION) - 1 &&

			    memcmp(opt, DNS_ERRORNO_OPTION, opt_nlen) == 0) {

				kdebug("dns error number option");

				if (opt_vlen <= 0)

					goto bad_option_value;



				ret = strict_strtoul(eq, 10, &derrno);

				if (ret < 0)

					goto bad_option_value;



				if (derrno < 1 || derrno > 511)

					goto bad_option_value;



				kdebug("dns error no. = %lu", derrno);

				key->type_data.x[0] = -derrno;

				continue;

			}



		bad_option_value:

			printk(KERN_WARNING

			       "Option '%*.*s' to dns_resolver key %d:"

			       " bad/missing value\n",

			       opt_nlen, opt_nlen, opt, key->serial);

			return -EINVAL;

		} while (opt = next_opt + 1, opt < end);

	}



	/* don't cache the result if we're caching an error saying there's no

	 * result */

	if (key->type_data.x[0]) {

		kleave(" = 0 [h_error %ld]", key->type_data.x[0]);

		return 0;

	}



	kdebug("store result");

	ret = key_payload_reserve(key, result_len);

	if (ret < 0)

		return -EINVAL;
@@ -135,13 +203,27 @@ no_match: 
	return ret;

}



/*

 * Describe a DNS key

 */

static void dns_resolver_describe(const struct key *key, struct seq_file *m)

{

	int err = key->type_data.x[0];



	seq_puts(m, key->description);

	if (err)

		seq_printf(m, ": %d", err);

	else

		seq_printf(m, ": %u", key->datalen);

}



struct key_type key_type_dns_resolver = {

	.name		= "dns_resolver",

	.instantiate	= dns_resolver_instantiate,

	.match		= dns_resolver_match,

	.revoke		= user_revoke,

	.destroy	= user_destroy,

	.describe	= user_describe,

	.describe	= dns_resolver_describe,

	.read		= user_read,

};

net/dns_resolver/dns_query.c

+5 −0
Original line number Diff line number Diff line
@@ -136,6 +136,11 @@ int dns_query(const char *type, const char *name, size_t namelen, 
	if (ret < 0)

		goto put;



	/* If the DNS server gave an error, return that to the caller */

	ret = rkey->type_data.x[0];

	if (ret)

		goto put;



	upayload = rcu_dereference_protected(rkey->payload.data,

					     lockdep_is_held(&rkey->sem));

	len = upayload->datalen;

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