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-rw-r--r--net/ceph/messenger.c131
1 files changed, 115 insertions, 16 deletions
diff --git a/net/ceph/messenger.c b/net/ceph/messenger.c
index 9918e9eb276e..ad5b70801f37 100644
--- a/net/ceph/messenger.c
+++ b/net/ceph/messenger.c
@@ -11,12 +11,14 @@
#include <linux/string.h>
#include <linux/bio.h>
#include <linux/blkdev.h>
+#include <linux/dns_resolver.h>
#include <net/tcp.h>
#include <linux/ceph/libceph.h>
#include <linux/ceph/messenger.h>
#include <linux/ceph/decode.h>
#include <linux/ceph/pagelist.h>
+#include <linux/export.h>
/*
* Ceph uses the messenger to exchange ceph_msg messages with other
@@ -1078,6 +1080,101 @@ static void addr_set_port(struct sockaddr_storage *ss, int p)
}
/*
+ * Unlike other *_pton function semantics, zero indicates success.
+ */
+static int ceph_pton(const char *str, size_t len, struct sockaddr_storage *ss,
+ char delim, const char **ipend)
+{
+ struct sockaddr_in *in4 = (void *)ss;
+ struct sockaddr_in6 *in6 = (void *)ss;
+
+ memset(ss, 0, sizeof(*ss));
+
+ if (in4_pton(str, len, (u8 *)&in4->sin_addr.s_addr, delim, ipend)) {
+ ss->ss_family = AF_INET;
+ return 0;
+ }
+
+ if (in6_pton(str, len, (u8 *)&in6->sin6_addr.s6_addr, delim, ipend)) {
+ ss->ss_family = AF_INET6;
+ return 0;
+ }
+
+ return -EINVAL;
+}
+
+/*
+ * Extract hostname string and resolve using kernel DNS facility.
+ */
+#ifdef CONFIG_CEPH_LIB_USE_DNS_RESOLVER
+static int ceph_dns_resolve_name(const char *name, size_t namelen,
+ struct sockaddr_storage *ss, char delim, const char **ipend)
+{
+ const char *end, *delim_p;
+ char *colon_p, *ip_addr = NULL;
+ int ip_len, ret;
+
+ /*
+ * The end of the hostname occurs immediately preceding the delimiter or
+ * the port marker (':') where the delimiter takes precedence.
+ */
+ delim_p = memchr(name, delim, namelen);
+ colon_p = memchr(name, ':', namelen);
+
+ if (delim_p && colon_p)
+ end = delim_p < colon_p ? delim_p : colon_p;
+ else if (!delim_p && colon_p)
+ end = colon_p;
+ else {
+ end = delim_p;
+ if (!end) /* case: hostname:/ */
+ end = name + namelen;
+ }
+
+ if (end <= name)
+ return -EINVAL;
+
+ /* do dns_resolve upcall */
+ ip_len = dns_query(NULL, name, end - name, NULL, &ip_addr, NULL);
+ if (ip_len > 0)
+ ret = ceph_pton(ip_addr, ip_len, ss, -1, NULL);
+ else
+ ret = -ESRCH;
+
+ kfree(ip_addr);
+
+ *ipend = end;
+
+ pr_info("resolve '%.*s' (ret=%d): %s\n", (int)(end - name), name,
+ ret, ret ? "failed" : ceph_pr_addr(ss));
+
+ return ret;
+}
+#else
+static inline int ceph_dns_resolve_name(const char *name, size_t namelen,
+ struct sockaddr_storage *ss, char delim, const char **ipend)
+{
+ return -EINVAL;
+}
+#endif
+
+/*
+ * Parse a server name (IP or hostname). If a valid IP address is not found
+ * then try to extract a hostname to resolve using userspace DNS upcall.
+ */
+static int ceph_parse_server_name(const char *name, size_t namelen,
+ struct sockaddr_storage *ss, char delim, const char **ipend)
+{
+ int ret;
+
+ ret = ceph_pton(name, namelen, ss, delim, ipend);
+ if (ret)
+ ret = ceph_dns_resolve_name(name, namelen, ss, delim, ipend);
+
+ return ret;
+}
+
+/*
* Parse an ip[:port] list into an addr array. Use the default
* monitor port if a port isn't specified.
*/
@@ -1085,15 +1182,13 @@ int ceph_parse_ips(const char *c, const char *end,
struct ceph_entity_addr *addr,
int max_count, int *count)
{
- int i;
+ int i, ret = -EINVAL;
const char *p = c;
dout("parse_ips on '%.*s'\n", (int)(end-c), c);
for (i = 0; i < max_count; i++) {
const char *ipend;
struct sockaddr_storage *ss = &addr[i].in_addr;
- struct sockaddr_in *in4 = (void *)ss;
- struct sockaddr_in6 *in6 = (void *)ss;
int port;
char delim = ',';
@@ -1102,15 +1197,11 @@ int ceph_parse_ips(const char *c, const char *end,
p++;
}
- memset(ss, 0, sizeof(*ss));
- if (in4_pton(p, end - p, (u8 *)&in4->sin_addr.s_addr,
- delim, &ipend))
- ss->ss_family = AF_INET;
- else if (in6_pton(p, end - p, (u8 *)&in6->sin6_addr.s6_addr,
- delim, &ipend))
- ss->ss_family = AF_INET6;
- else
+ ret = ceph_parse_server_name(p, end - p, ss, delim, &ipend);
+ if (ret)
goto bad;
+ ret = -EINVAL;
+
p = ipend;
if (delim == ']') {
@@ -1155,7 +1246,7 @@ int ceph_parse_ips(const char *c, const char *end,
bad:
pr_err("parse_ips bad ip '%.*s'\n", (int)(end - c), c);
- return -EINVAL;
+ return ret;
}
EXPORT_SYMBOL(ceph_parse_ips);
@@ -2281,7 +2372,8 @@ EXPORT_SYMBOL(ceph_con_keepalive);
* construct a new message with given type, size
* the new msg has a ref count of 1.
*/
-struct ceph_msg *ceph_msg_new(int type, int front_len, gfp_t flags)
+struct ceph_msg *ceph_msg_new(int type, int front_len, gfp_t flags,
+ bool can_fail)
{
struct ceph_msg *m;
@@ -2333,7 +2425,7 @@ struct ceph_msg *ceph_msg_new(int type, int front_len, gfp_t flags)
m->front.iov_base = kmalloc(front_len, flags);
}
if (m->front.iov_base == NULL) {
- pr_err("msg_new can't allocate %d bytes\n",
+ dout("ceph_msg_new can't allocate %d bytes\n",
front_len);
goto out2;
}
@@ -2348,7 +2440,14 @@ struct ceph_msg *ceph_msg_new(int type, int front_len, gfp_t flags)
out2:
ceph_msg_put(m);
out:
- pr_err("msg_new can't create type %d front %d\n", type, front_len);
+ if (!can_fail) {
+ pr_err("msg_new can't create type %d front %d\n", type,
+ front_len);
+ WARN_ON(1);
+ } else {
+ dout("msg_new can't create type %d front %d\n", type,
+ front_len);
+ }
return NULL;
}
EXPORT_SYMBOL(ceph_msg_new);
@@ -2398,7 +2497,7 @@ static struct ceph_msg *ceph_alloc_msg(struct ceph_connection *con,
}
if (!msg) {
*skip = 0;
- msg = ceph_msg_new(type, front_len, GFP_NOFS);
+ msg = ceph_msg_new(type, front_len, GFP_NOFS, false);
if (!msg) {
pr_err("unable to allocate msg type %d len %d\n",
type, front_len);