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-rw-r--r--fs/cifs/Makefile2
-rw-r--r--fs/cifs/cifs_swn.c421
-rw-r--r--fs/cifs/cifs_swn.h17
-rw-r--r--fs/cifs/connect.c26
-rw-r--r--fs/cifs/netlink.c11
-rw-r--r--include/uapi/linux/cifs/cifs_netlink.h15
6 files changed, 489 insertions, 3 deletions
diff --git a/fs/cifs/Makefile b/fs/cifs/Makefile
index 9e398d227b0e..5213b20843b5 100644
--- a/fs/cifs/Makefile
+++ b/fs/cifs/Makefile
@@ -18,7 +18,7 @@ cifs-$(CONFIG_CIFS_UPCALL) += cifs_spnego.o
cifs-$(CONFIG_CIFS_DFS_UPCALL) += dns_resolve.o cifs_dfs_ref.o dfs_cache.o
-cifs-$(CONFIG_CIFS_SWN_UPCALL) += netlink.o
+cifs-$(CONFIG_CIFS_SWN_UPCALL) += netlink.o cifs_swn.o
cifs-$(CONFIG_CIFS_FSCACHE) += fscache.o cache.o
diff --git a/fs/cifs/cifs_swn.c b/fs/cifs/cifs_swn.c
new file mode 100644
index 000000000000..c0af03955d0c
--- /dev/null
+++ b/fs/cifs/cifs_swn.c
@@ -0,0 +1,421 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Witness Service client for CIFS
+ *
+ * Copyright (c) 2020 Samuel Cabrero <scabrero@suse.de>
+ */
+
+#include <linux/kref.h>
+#include <net/genetlink.h>
+#include <uapi/linux/cifs/cifs_netlink.h>
+
+#include "cifs_swn.h"
+#include "cifsglob.h"
+#include "cifsproto.h"
+#include "fscache.h"
+#include "cifs_debug.h"
+#include "netlink.h"
+
+static DEFINE_IDR(cifs_swnreg_idr);
+static DEFINE_MUTEX(cifs_swnreg_idr_mutex);
+
+struct cifs_swn_reg {
+ int id;
+ struct kref ref_count;
+
+ const char *net_name;
+ const char *share_name;
+ bool net_name_notify;
+ bool share_name_notify;
+ bool ip_notify;
+
+ struct cifs_tcon *tcon;
+};
+
+static int cifs_swn_auth_info_krb(struct cifs_tcon *tcon, struct sk_buff *skb)
+{
+ int ret;
+
+ ret = nla_put_flag(skb, CIFS_GENL_ATTR_SWN_KRB_AUTH);
+ if (ret < 0)
+ return ret;
+
+ return 0;
+}
+
+static int cifs_swn_auth_info_ntlm(struct cifs_tcon *tcon, struct sk_buff *skb)
+{
+ int ret;
+
+ if (tcon->ses->user_name != NULL) {
+ ret = nla_put_string(skb, CIFS_GENL_ATTR_SWN_USER_NAME, tcon->ses->user_name);
+ if (ret < 0)
+ return ret;
+ }
+
+ if (tcon->ses->password != NULL) {
+ ret = nla_put_string(skb, CIFS_GENL_ATTR_SWN_PASSWORD, tcon->ses->password);
+ if (ret < 0)
+ return ret;
+ }
+
+ if (tcon->ses->domainName != NULL) {
+ ret = nla_put_string(skb, CIFS_GENL_ATTR_SWN_DOMAIN_NAME, tcon->ses->domainName);
+ if (ret < 0)
+ return ret;
+ }
+
+ return 0;
+}
+
+/*
+ * Sends a register message to the userspace daemon based on the registration.
+ * The authentication information to connect to the witness service is bundled
+ * into the message.
+ */
+static int cifs_swn_send_register_message(struct cifs_swn_reg *swnreg)
+{
+ struct sk_buff *skb;
+ struct genlmsghdr *hdr;
+ enum securityEnum authtype;
+ int ret;
+
+ skb = genlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
+ if (skb == NULL) {
+ ret = -ENOMEM;
+ goto fail;
+ }
+
+ hdr = genlmsg_put(skb, 0, 0, &cifs_genl_family, 0, CIFS_GENL_CMD_SWN_REGISTER);
+ if (hdr == NULL) {
+ ret = -ENOMEM;
+ goto nlmsg_fail;
+ }
+
+ ret = nla_put_u32(skb, CIFS_GENL_ATTR_SWN_REGISTRATION_ID, swnreg->id);
+ if (ret < 0)
+ goto nlmsg_fail;
+
+ ret = nla_put_string(skb, CIFS_GENL_ATTR_SWN_NET_NAME, swnreg->net_name);
+ if (ret < 0)
+ goto nlmsg_fail;
+
+ ret = nla_put_string(skb, CIFS_GENL_ATTR_SWN_SHARE_NAME, swnreg->share_name);
+ if (ret < 0)
+ goto nlmsg_fail;
+
+ ret = nla_put(skb, CIFS_GENL_ATTR_SWN_IP, sizeof(struct sockaddr_storage),
+ &swnreg->tcon->ses->server->dstaddr);
+ if (ret < 0)
+ goto nlmsg_fail;
+
+ if (swnreg->net_name_notify) {
+ ret = nla_put_flag(skb, CIFS_GENL_ATTR_SWN_NET_NAME_NOTIFY);
+ if (ret < 0)
+ goto nlmsg_fail;
+ }
+
+ if (swnreg->share_name_notify) {
+ ret = nla_put_flag(skb, CIFS_GENL_ATTR_SWN_SHARE_NAME_NOTIFY);
+ if (ret < 0)
+ goto nlmsg_fail;
+ }
+
+ if (swnreg->ip_notify) {
+ ret = nla_put_flag(skb, CIFS_GENL_ATTR_SWN_IP_NOTIFY);
+ if (ret < 0)
+ goto nlmsg_fail;
+ }
+
+ authtype = cifs_select_sectype(swnreg->tcon->ses->server, swnreg->tcon->ses->sectype);
+ switch (authtype) {
+ case Kerberos:
+ ret = cifs_swn_auth_info_krb(swnreg->tcon, skb);
+ if (ret < 0) {
+ cifs_dbg(VFS, "%s: Failed to get kerberos auth info: %d\n", __func__, ret);
+ goto nlmsg_fail;
+ }
+ break;
+ case LANMAN:
+ case NTLM:
+ case NTLMv2:
+ case RawNTLMSSP:
+ ret = cifs_swn_auth_info_ntlm(swnreg->tcon, skb);
+ if (ret < 0) {
+ cifs_dbg(VFS, "%s: Failed to get NTLM auth info: %d\n", __func__, ret);
+ goto nlmsg_fail;
+ }
+ break;
+ default:
+ cifs_dbg(VFS, "%s: secType %d not supported!\n", __func__, authtype);
+ ret = -EINVAL;
+ goto nlmsg_fail;
+ }
+
+ genlmsg_end(skb, hdr);
+ genlmsg_multicast(&cifs_genl_family, skb, 0, CIFS_GENL_MCGRP_SWN, GFP_ATOMIC);
+
+ cifs_dbg(FYI, "%s: Message to register for network name %s with id %d sent\n", __func__,
+ swnreg->net_name, swnreg->id);
+
+ return 0;
+
+nlmsg_fail:
+ genlmsg_cancel(skb, hdr);
+ nlmsg_free(skb);
+fail:
+ return ret;
+}
+
+/*
+ * Sends an uregister message to the userspace daemon based on the registration
+ */
+static int cifs_swn_send_unregister_message(struct cifs_swn_reg *swnreg)
+{
+ struct sk_buff *skb;
+ struct genlmsghdr *hdr;
+ int ret;
+
+ skb = genlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
+ if (skb == NULL)
+ return -ENOMEM;
+
+ hdr = genlmsg_put(skb, 0, 0, &cifs_genl_family, 0, CIFS_GENL_CMD_SWN_UNREGISTER);
+ if (hdr == NULL) {
+ ret = -ENOMEM;
+ goto nlmsg_fail;
+ }
+
+ ret = nla_put_u32(skb, CIFS_GENL_ATTR_SWN_REGISTRATION_ID, swnreg->id);
+ if (ret < 0)
+ goto nlmsg_fail;
+
+ ret = nla_put_string(skb, CIFS_GENL_ATTR_SWN_NET_NAME, swnreg->net_name);
+ if (ret < 0)
+ goto nlmsg_fail;
+
+ ret = nla_put_string(skb, CIFS_GENL_ATTR_SWN_SHARE_NAME, swnreg->share_name);
+ if (ret < 0)
+ goto nlmsg_fail;
+
+ ret = nla_put(skb, CIFS_GENL_ATTR_SWN_IP, sizeof(struct sockaddr_storage),
+ &swnreg->tcon->ses->server->dstaddr);
+ if (ret < 0)
+ goto nlmsg_fail;
+
+ if (swnreg->net_name_notify) {
+ ret = nla_put_flag(skb, CIFS_GENL_ATTR_SWN_NET_NAME_NOTIFY);
+ if (ret < 0)
+ goto nlmsg_fail;
+ }
+
+ if (swnreg->share_name_notify) {
+ ret = nla_put_flag(skb, CIFS_GENL_ATTR_SWN_SHARE_NAME_NOTIFY);
+ if (ret < 0)
+ goto nlmsg_fail;
+ }
+
+ if (swnreg->ip_notify) {
+ ret = nla_put_flag(skb, CIFS_GENL_ATTR_SWN_IP_NOTIFY);
+ if (ret < 0)
+ goto nlmsg_fail;
+ }
+
+ genlmsg_end(skb, hdr);
+ genlmsg_multicast(&cifs_genl_family, skb, 0, CIFS_GENL_MCGRP_SWN, GFP_ATOMIC);
+
+ cifs_dbg(FYI, "%s: Message to unregister for network name %s with id %d sent\n", __func__,
+ swnreg->net_name, swnreg->id);
+
+ return 0;
+
+nlmsg_fail:
+ genlmsg_cancel(skb, hdr);
+ nlmsg_free(skb);
+ return ret;
+}
+
+/*
+ * Try to find a matching registration for the tcon's server name and share name.
+ * Calls to this funciton must be protected by cifs_swnreg_idr_mutex.
+ * TODO Try to avoid memory allocations
+ */
+static struct cifs_swn_reg *cifs_find_swn_reg(struct cifs_tcon *tcon)
+{
+ struct cifs_swn_reg *swnreg;
+ int id;
+ const char *share_name;
+ const char *net_name;
+
+ net_name = extract_hostname(tcon->treeName);
+ if (IS_ERR_OR_NULL(net_name)) {
+ int ret;
+
+ ret = PTR_ERR(net_name);
+ cifs_dbg(VFS, "%s: failed to extract host name from target '%s': %d\n",
+ __func__, tcon->treeName, ret);
+ return NULL;
+ }
+
+ share_name = extract_sharename(tcon->treeName);
+ if (IS_ERR_OR_NULL(share_name)) {
+ int ret;
+
+ ret = PTR_ERR(net_name);
+ cifs_dbg(VFS, "%s: failed to extract share name from target '%s': %d\n",
+ __func__, tcon->treeName, ret);
+ kfree(net_name);
+ return NULL;
+ }
+
+ idr_for_each_entry(&cifs_swnreg_idr, swnreg, id) {
+ if (strcasecmp(swnreg->net_name, net_name) != 0
+ || strcasecmp(swnreg->share_name, share_name) != 0) {
+ continue;
+ }
+
+ mutex_unlock(&cifs_swnreg_idr_mutex);
+
+ cifs_dbg(FYI, "Existing swn registration for %s:%s found\n", swnreg->net_name,
+ swnreg->share_name);
+
+ kfree(net_name);
+ kfree(share_name);
+
+ return swnreg;
+ }
+
+ kfree(net_name);
+ kfree(share_name);
+
+ return NULL;
+}
+
+/*
+ * Get a registration for the tcon's server and share name, allocating a new one if it does not
+ * exists
+ */
+static struct cifs_swn_reg *cifs_get_swn_reg(struct cifs_tcon *tcon)
+{
+ struct cifs_swn_reg *reg = NULL;
+ int ret;
+
+ mutex_lock(&cifs_swnreg_idr_mutex);
+
+ /* Check if we are already registered for this network and share names */
+ reg = cifs_find_swn_reg(tcon);
+ if (IS_ERR(reg)) {
+ return reg;
+ } else if (reg != NULL) {
+ kref_get(&reg->ref_count);
+ mutex_unlock(&cifs_swnreg_idr_mutex);
+ return reg;
+ }
+
+ reg = kmalloc(sizeof(struct cifs_swn_reg), GFP_ATOMIC);
+ if (reg == NULL) {
+ mutex_unlock(&cifs_swnreg_idr_mutex);
+ return ERR_PTR(-ENOMEM);
+ }
+
+ kref_init(&reg->ref_count);
+
+ reg->id = idr_alloc(&cifs_swnreg_idr, reg, 1, 0, GFP_ATOMIC);
+ if (reg->id < 0) {
+ cifs_dbg(FYI, "%s: failed to allocate registration id\n", __func__);
+ ret = reg->id;
+ goto fail;
+ }
+
+ reg->net_name = extract_hostname(tcon->treeName);
+ if (IS_ERR(reg->net_name)) {
+ ret = PTR_ERR(reg->net_name);
+ cifs_dbg(VFS, "%s: failed to extract host name from target: %d\n", __func__, ret);
+ goto fail_idr;
+ }
+
+ reg->share_name = extract_sharename(tcon->treeName);
+ if (IS_ERR(reg->share_name)) {
+ ret = PTR_ERR(reg->share_name);
+ cifs_dbg(VFS, "%s: failed to extract share name from target: %d\n", __func__, ret);
+ goto fail_net_name;
+ }
+
+ reg->net_name_notify = true;
+ reg->share_name_notify = true;
+ reg->ip_notify = (tcon->capabilities & SMB2_SHARE_CAP_SCALEOUT);
+
+ reg->tcon = tcon;
+
+ mutex_unlock(&cifs_swnreg_idr_mutex);
+
+ return reg;
+
+fail_net_name:
+ kfree(reg->net_name);
+fail_idr:
+ idr_remove(&cifs_swnreg_idr, reg->id);
+fail:
+ kfree(reg);
+ mutex_unlock(&cifs_swnreg_idr_mutex);
+ return ERR_PTR(ret);
+}
+
+static void cifs_swn_reg_release(struct kref *ref)
+{
+ struct cifs_swn_reg *swnreg = container_of(ref, struct cifs_swn_reg, ref_count);
+ int ret;
+
+ ret = cifs_swn_send_unregister_message(swnreg);
+ if (ret < 0)
+ cifs_dbg(VFS, "%s: Failed to send unregister message: %d\n", __func__, ret);
+
+ idr_remove(&cifs_swnreg_idr, swnreg->id);
+ kfree(swnreg->net_name);
+ kfree(swnreg->share_name);
+ kfree(swnreg);
+}
+
+static void cifs_put_swn_reg(struct cifs_swn_reg *swnreg)
+{
+ mutex_lock(&cifs_swnreg_idr_mutex);
+ kref_put(&swnreg->ref_count, cifs_swn_reg_release);
+ mutex_unlock(&cifs_swnreg_idr_mutex);
+}
+
+int cifs_swn_register(struct cifs_tcon *tcon)
+{
+ struct cifs_swn_reg *swnreg;
+ int ret;
+
+ swnreg = cifs_get_swn_reg(tcon);
+ if (IS_ERR(swnreg))
+ return PTR_ERR(swnreg);
+
+ ret = cifs_swn_send_register_message(swnreg);
+ if (ret < 0) {
+ cifs_dbg(VFS, "%s: Failed to send swn register message: %d\n", __func__, ret);
+ /* Do not put the swnreg or return error, the echo task will retry */
+ }
+
+ return 0;
+}
+
+int cifs_swn_unregister(struct cifs_tcon *tcon)
+{
+ struct cifs_swn_reg *swnreg;
+
+ mutex_lock(&cifs_swnreg_idr_mutex);
+
+ swnreg = cifs_find_swn_reg(tcon);
+ if (swnreg == NULL) {
+ mutex_unlock(&cifs_swnreg_idr_mutex);
+ return -EEXIST;
+ }
+
+ mutex_unlock(&cifs_swnreg_idr_mutex);
+
+ cifs_put_swn_reg(swnreg);
+
+ return 0;
+}
diff --git a/fs/cifs/cifs_swn.h b/fs/cifs/cifs_swn.h
new file mode 100644
index 000000000000..69c7bd1035da
--- /dev/null
+++ b/fs/cifs/cifs_swn.h
@@ -0,0 +1,17 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Witness Service client for CIFS
+ *
+ * Copyright (c) 2020 Samuel Cabrero <scabrero@suse.de>
+ */
+
+#ifndef _CIFS_SWN_H
+#define _CIFS_SWN_H
+
+struct cifs_tcon;
+
+extern int cifs_swn_register(struct cifs_tcon *tcon);
+
+extern int cifs_swn_unregister(struct cifs_tcon *tcon);
+
+#endif /* _CIFS_SWN_H */
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index ead1c086b88d..68ef2da7c74b 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -62,6 +62,9 @@
#include "dfs_cache.h"
#endif
#include "fs_context.h"
+#ifdef CONFIG_CIFS_SWN_UPCALL
+#include "cifs_swn.h"
+#endif
extern mempool_t *cifs_req_poolp;
extern bool disable_legacy_dialects;
@@ -1944,7 +1947,17 @@ cifs_put_tcon(struct cifs_tcon *tcon)
return;
}
- /* TODO witness unregister */
+#ifdef CONFIG_CIFS_SWN_UPCALL
+ if (tcon->use_witness) {
+ int rc;
+
+ rc = cifs_swn_unregister(tcon);
+ if (rc < 0) {
+ cifs_dbg(VFS, "%s: Failed to unregister for witness notifications: %d\n",
+ __func__, rc);
+ }
+ }
+#endif
list_del_init(&tcon->tcon_list);
spin_unlock(&cifs_tcp_ses_lock);
@@ -2111,8 +2124,17 @@ cifs_get_tcon(struct cifs_ses *ses, struct smb3_fs_context *ctx)
if (ctx->witness) {
if (ses->server->vals->protocol_id >= SMB30_PROT_ID) {
if (tcon->capabilities & SMB2_SHARE_CAP_CLUSTER) {
- /* TODO witness register */
+ /*
+ * Set witness in use flag in first place
+ * to retry registration in the echo task
+ */
tcon->use_witness = true;
+ /* And try to register immediately */
+ rc = cifs_swn_register(tcon);
+ if (rc < 0) {
+ cifs_dbg(VFS, "Failed to register for witness notifications: %d\n", rc);
+ goto out_fail;
+ }
} else {
/* TODO: try to extend for non-cluster uses (eg multichannel) */
cifs_dbg(VFS, "witness requested on mount but no CLUSTER capability on share\n");
diff --git a/fs/cifs/netlink.c b/fs/cifs/netlink.c
index b9154661fa85..83008a56def5 100644
--- a/fs/cifs/netlink.c
+++ b/fs/cifs/netlink.c
@@ -13,6 +13,17 @@
#include "cifs_debug.h"
static const struct nla_policy cifs_genl_policy[CIFS_GENL_ATTR_MAX + 1] = {
+ [CIFS_GENL_ATTR_SWN_REGISTRATION_ID] = { .type = NLA_U32 },
+ [CIFS_GENL_ATTR_SWN_NET_NAME] = { .type = NLA_STRING },
+ [CIFS_GENL_ATTR_SWN_SHARE_NAME] = { .type = NLA_STRING },
+ [CIFS_GENL_ATTR_SWN_IP] = { .len = sizeof(struct sockaddr_storage) },
+ [CIFS_GENL_ATTR_SWN_NET_NAME_NOTIFY] = { .type = NLA_FLAG },
+ [CIFS_GENL_ATTR_SWN_SHARE_NAME_NOTIFY] = { .type = NLA_FLAG },
+ [CIFS_GENL_ATTR_SWN_IP_NOTIFY] = { .type = NLA_FLAG },
+ [CIFS_GENL_ATTR_SWN_KRB_AUTH] = { .type = NLA_FLAG },
+ [CIFS_GENL_ATTR_SWN_USER_NAME] = { .type = NLA_STRING },
+ [CIFS_GENL_ATTR_SWN_PASSWORD] = { .type = NLA_STRING },
+ [CIFS_GENL_ATTR_SWN_DOMAIN_NAME] = { .type = NLA_STRING },
};
static struct genl_ops cifs_genl_ops[] = {
diff --git a/include/uapi/linux/cifs/cifs_netlink.h b/include/uapi/linux/cifs/cifs_netlink.h
index cdb1bd78fbc7..5662e2774513 100644
--- a/include/uapi/linux/cifs/cifs_netlink.h
+++ b/include/uapi/linux/cifs/cifs_netlink.h
@@ -19,11 +19,26 @@ enum cifs_genl_multicast_groups {
};
enum cifs_genl_attributes {
+ CIFS_GENL_ATTR_UNSPEC,
+ CIFS_GENL_ATTR_SWN_REGISTRATION_ID,
+ CIFS_GENL_ATTR_SWN_NET_NAME,
+ CIFS_GENL_ATTR_SWN_SHARE_NAME,
+ CIFS_GENL_ATTR_SWN_IP,
+ CIFS_GENL_ATTR_SWN_NET_NAME_NOTIFY,
+ CIFS_GENL_ATTR_SWN_SHARE_NAME_NOTIFY,
+ CIFS_GENL_ATTR_SWN_IP_NOTIFY,
+ CIFS_GENL_ATTR_SWN_KRB_AUTH,
+ CIFS_GENL_ATTR_SWN_USER_NAME,
+ CIFS_GENL_ATTR_SWN_PASSWORD,
+ CIFS_GENL_ATTR_SWN_DOMAIN_NAME,
__CIFS_GENL_ATTR_MAX,
};
#define CIFS_GENL_ATTR_MAX (__CIFS_GENL_ATTR_MAX - 1)
enum cifs_genl_commands {
+ CIFS_GENL_CMD_UNSPEC,
+ CIFS_GENL_CMD_SWN_REGISTER,
+ CIFS_GENL_CMD_SWN_UNREGISTER,
__CIFS_GENL_CMD_MAX
};
#define CIFS_GENL_CMD_MAX (__CIFS_GENL_CMD_MAX - 1)
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.