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- // SPDX-License-Identifier: GPL-2.0
- /*
- * Witness Service client for CIFS
- *
- * Copyright (c) 2020 Samuel Cabrero <[email protected]>
- */
- #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;
- struct sockaddr_storage *addr;
- 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;
- /*
- * If there is an address stored use it instead of the server address, because we are
- * in the process of reconnecting to it after a share has been moved or we have been
- * told to switch to it (client move message). In these cases we unregister from the
- * server address and register to the new address when we receive the notification.
- */
- if (swnreg->tcon->ses->server->use_swn_dstaddr)
- addr = &swnreg->tcon->ses->server->swn_dstaddr;
- else
- addr = &swnreg->tcon->ses->server->dstaddr;
- ret = nla_put(skb, CIFS_GENL_ATTR_SWN_IP, sizeof(struct sockaddr_storage), addr);
- 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 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 function 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->tree_name);
- if (IS_ERR(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->tree_name, ret);
- return ERR_PTR(-EINVAL);
- }
- share_name = extract_sharename(tcon->tree_name);
- if (IS_ERR(share_name)) {
- int ret;
- ret = PTR_ERR(share_name);
- cifs_dbg(VFS, "%s: failed to extract share name from target '%s': %d\n",
- __func__, tcon->tree_name, ret);
- kfree(net_name);
- return ERR_PTR(-EINVAL);
- }
- 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;
- }
- 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 ERR_PTR(-EEXIST);
- }
- /*
- * 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)) {
- kref_get(®->ref_count);
- mutex_unlock(&cifs_swnreg_idr_mutex);
- return reg;
- } else if (PTR_ERR(reg) != -EEXIST) {
- 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(®->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->tree_name);
- 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->tree_name);
- 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);
- }
- static int cifs_swn_resource_state_changed(struct cifs_swn_reg *swnreg, const char *name, int state)
- {
- switch (state) {
- case CIFS_SWN_RESOURCE_STATE_UNAVAILABLE:
- cifs_dbg(FYI, "%s: resource name '%s' become unavailable\n", __func__, name);
- cifs_signal_cifsd_for_reconnect(swnreg->tcon->ses->server, true);
- break;
- case CIFS_SWN_RESOURCE_STATE_AVAILABLE:
- cifs_dbg(FYI, "%s: resource name '%s' become available\n", __func__, name);
- cifs_signal_cifsd_for_reconnect(swnreg->tcon->ses->server, true);
- break;
- case CIFS_SWN_RESOURCE_STATE_UNKNOWN:
- cifs_dbg(FYI, "%s: resource name '%s' changed to unknown state\n", __func__, name);
- break;
- }
- return 0;
- }
- static bool cifs_sockaddr_equal(struct sockaddr_storage *addr1, struct sockaddr_storage *addr2)
- {
- if (addr1->ss_family != addr2->ss_family)
- return false;
- if (addr1->ss_family == AF_INET) {
- return (memcmp(&((const struct sockaddr_in *)addr1)->sin_addr,
- &((const struct sockaddr_in *)addr2)->sin_addr,
- sizeof(struct in_addr)) == 0);
- }
- if (addr1->ss_family == AF_INET6) {
- return (memcmp(&((const struct sockaddr_in6 *)addr1)->sin6_addr,
- &((const struct sockaddr_in6 *)addr2)->sin6_addr,
- sizeof(struct in6_addr)) == 0);
- }
- return false;
- }
- static int cifs_swn_store_swn_addr(const struct sockaddr_storage *new,
- const struct sockaddr_storage *old,
- struct sockaddr_storage *dst)
- {
- __be16 port = cpu_to_be16(CIFS_PORT);
- if (old->ss_family == AF_INET) {
- struct sockaddr_in *ipv4 = (struct sockaddr_in *)old;
- port = ipv4->sin_port;
- } else if (old->ss_family == AF_INET6) {
- struct sockaddr_in6 *ipv6 = (struct sockaddr_in6 *)old;
- port = ipv6->sin6_port;
- }
- if (new->ss_family == AF_INET) {
- struct sockaddr_in *ipv4 = (struct sockaddr_in *)new;
- ipv4->sin_port = port;
- } else if (new->ss_family == AF_INET6) {
- struct sockaddr_in6 *ipv6 = (struct sockaddr_in6 *)new;
- ipv6->sin6_port = port;
- }
- *dst = *new;
- return 0;
- }
- static int cifs_swn_reconnect(struct cifs_tcon *tcon, struct sockaddr_storage *addr)
- {
- int ret = 0;
- /* Store the reconnect address */
- cifs_server_lock(tcon->ses->server);
- if (cifs_sockaddr_equal(&tcon->ses->server->dstaddr, addr))
- goto unlock;
- ret = cifs_swn_store_swn_addr(addr, &tcon->ses->server->dstaddr,
- &tcon->ses->server->swn_dstaddr);
- if (ret < 0) {
- cifs_dbg(VFS, "%s: failed to store address: %d\n", __func__, ret);
- goto unlock;
- }
- tcon->ses->server->use_swn_dstaddr = true;
- /*
- * Unregister to stop receiving notifications for the old IP address.
- */
- ret = cifs_swn_unregister(tcon);
- if (ret < 0) {
- cifs_dbg(VFS, "%s: Failed to unregister for witness notifications: %d\n",
- __func__, ret);
- goto unlock;
- }
- /*
- * And register to receive notifications for the new IP address now that we have
- * stored the new address.
- */
- ret = cifs_swn_register(tcon);
- if (ret < 0) {
- cifs_dbg(VFS, "%s: Failed to register for witness notifications: %d\n",
- __func__, ret);
- goto unlock;
- }
- cifs_signal_cifsd_for_reconnect(tcon->ses->server, false);
- unlock:
- cifs_server_unlock(tcon->ses->server);
- return ret;
- }
- static int cifs_swn_client_move(struct cifs_swn_reg *swnreg, struct sockaddr_storage *addr)
- {
- struct sockaddr_in *ipv4 = (struct sockaddr_in *)addr;
- struct sockaddr_in6 *ipv6 = (struct sockaddr_in6 *)addr;
- if (addr->ss_family == AF_INET)
- cifs_dbg(FYI, "%s: move to %pI4\n", __func__, &ipv4->sin_addr);
- else if (addr->ss_family == AF_INET6)
- cifs_dbg(FYI, "%s: move to %pI6\n", __func__, &ipv6->sin6_addr);
- return cifs_swn_reconnect(swnreg->tcon, addr);
- }
- int cifs_swn_notify(struct sk_buff *skb, struct genl_info *info)
- {
- struct cifs_swn_reg *swnreg;
- char name[256];
- int type;
- if (info->attrs[CIFS_GENL_ATTR_SWN_REGISTRATION_ID]) {
- int swnreg_id;
- swnreg_id = nla_get_u32(info->attrs[CIFS_GENL_ATTR_SWN_REGISTRATION_ID]);
- mutex_lock(&cifs_swnreg_idr_mutex);
- swnreg = idr_find(&cifs_swnreg_idr, swnreg_id);
- mutex_unlock(&cifs_swnreg_idr_mutex);
- if (swnreg == NULL) {
- cifs_dbg(FYI, "%s: registration id %d not found\n", __func__, swnreg_id);
- return -EINVAL;
- }
- } else {
- cifs_dbg(FYI, "%s: missing registration id attribute\n", __func__);
- return -EINVAL;
- }
- if (info->attrs[CIFS_GENL_ATTR_SWN_NOTIFICATION_TYPE]) {
- type = nla_get_u32(info->attrs[CIFS_GENL_ATTR_SWN_NOTIFICATION_TYPE]);
- } else {
- cifs_dbg(FYI, "%s: missing notification type attribute\n", __func__);
- return -EINVAL;
- }
- switch (type) {
- case CIFS_SWN_NOTIFICATION_RESOURCE_CHANGE: {
- int state;
- if (info->attrs[CIFS_GENL_ATTR_SWN_RESOURCE_NAME]) {
- nla_strscpy(name, info->attrs[CIFS_GENL_ATTR_SWN_RESOURCE_NAME],
- sizeof(name));
- } else {
- cifs_dbg(FYI, "%s: missing resource name attribute\n", __func__);
- return -EINVAL;
- }
- if (info->attrs[CIFS_GENL_ATTR_SWN_RESOURCE_STATE]) {
- state = nla_get_u32(info->attrs[CIFS_GENL_ATTR_SWN_RESOURCE_STATE]);
- } else {
- cifs_dbg(FYI, "%s: missing resource state attribute\n", __func__);
- return -EINVAL;
- }
- return cifs_swn_resource_state_changed(swnreg, name, state);
- }
- case CIFS_SWN_NOTIFICATION_CLIENT_MOVE: {
- struct sockaddr_storage addr;
- if (info->attrs[CIFS_GENL_ATTR_SWN_IP]) {
- nla_memcpy(&addr, info->attrs[CIFS_GENL_ATTR_SWN_IP], sizeof(addr));
- } else {
- cifs_dbg(FYI, "%s: missing IP address attribute\n", __func__);
- return -EINVAL;
- }
- return cifs_swn_client_move(swnreg, &addr);
- }
- default:
- cifs_dbg(FYI, "%s: unknown notification type %d\n", __func__, type);
- break;
- }
- return 0;
- }
- 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 (IS_ERR(swnreg)) {
- mutex_unlock(&cifs_swnreg_idr_mutex);
- return PTR_ERR(swnreg);
- }
- mutex_unlock(&cifs_swnreg_idr_mutex);
- cifs_put_swn_reg(swnreg);
- return 0;
- }
- void cifs_swn_dump(struct seq_file *m)
- {
- struct cifs_swn_reg *swnreg;
- struct sockaddr_in *sa;
- struct sockaddr_in6 *sa6;
- int id;
- seq_puts(m, "Witness registrations:");
- mutex_lock(&cifs_swnreg_idr_mutex);
- idr_for_each_entry(&cifs_swnreg_idr, swnreg, id) {
- seq_printf(m, "\nId: %u Refs: %u Network name: '%s'%s Share name: '%s'%s Ip address: ",
- id, kref_read(&swnreg->ref_count),
- swnreg->net_name, swnreg->net_name_notify ? "(y)" : "(n)",
- swnreg->share_name, swnreg->share_name_notify ? "(y)" : "(n)");
- switch (swnreg->tcon->ses->server->dstaddr.ss_family) {
- case AF_INET:
- sa = (struct sockaddr_in *) &swnreg->tcon->ses->server->dstaddr;
- seq_printf(m, "%pI4", &sa->sin_addr.s_addr);
- break;
- case AF_INET6:
- sa6 = (struct sockaddr_in6 *) &swnreg->tcon->ses->server->dstaddr;
- seq_printf(m, "%pI6", &sa6->sin6_addr.s6_addr);
- if (sa6->sin6_scope_id)
- seq_printf(m, "%%%u", sa6->sin6_scope_id);
- break;
- default:
- seq_puts(m, "(unknown)");
- }
- seq_printf(m, "%s", swnreg->ip_notify ? "(y)" : "(n)");
- }
- mutex_unlock(&cifs_swnreg_idr_mutex);
- seq_puts(m, "\n");
- }
- void cifs_swn_check(void)
- {
- struct cifs_swn_reg *swnreg;
- int id;
- int ret;
- mutex_lock(&cifs_swnreg_idr_mutex);
- idr_for_each_entry(&cifs_swnreg_idr, swnreg, id) {
- ret = cifs_swn_send_register_message(swnreg);
- if (ret < 0)
- cifs_dbg(FYI, "%s: Failed to send register message: %d\n", __func__, ret);
- }
- mutex_unlock(&cifs_swnreg_idr_mutex);
- }
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