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authorWang Lei <wang840925@gmail.com>2010-08-11 09:37:58 +0100
committerSteve French <sfrench@us.ibm.com>2010-08-11 17:11:28 +0000
commit4a2d789267e00b5a1175ecd2ddefcc78b83fbf09 (patch)
treeee0372ca2719a998fca29e6fe3b9c0a3ceabbfc7 /net/dns_resolver
parentc2e8139c9f797baa46515af6d350c51823736cbb (diff)
downloadlinux-4a2d789267e00b5a1175ecd2ddefcc78b83fbf09.tar.gz
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: Wang Lei <wang840925@gmail.com> Signed-off-by: David Howells <dhowells@redhat.com> Acked-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
Diffstat (limited to 'net/dns_resolver')
-rw-r--r--net/dns_resolver/dns_key.c92
-rw-r--r--net/dns_resolver/dns_query.c5
2 files changed, 92 insertions, 5 deletions
diff --git a/net/dns_resolver/dns_key.c b/net/dns_resolver/dns_key.c
index 400a04d5c9a..739435a6af3 100644
--- a/net/dns_resolver/dns_key.c
+++ b/net/dns_resolver/dns_key.c
@@ -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");
- return -EINVAL;
+ /* 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;
+ }
+
+ 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;
}
- result_len = datalen;
+ 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,
};
diff --git a/net/dns_resolver/dns_query.c b/net/dns_resolver/dns_query.c
index 03d5255f5cf..c32be292c7e 100644
--- a/net/dns_resolver/dns_query.c
+++ b/net/dns_resolver/dns_query.c
@@ -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;