diff options
Diffstat (limited to 'fs/cifs/misc.c')
| -rw-r--r-- | fs/cifs/misc.c | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/fs/cifs/misc.c b/fs/cifs/misc.c index 550ce9020a3e..1ec6a5543eda 100644 --- a/fs/cifs/misc.c +++ b/fs/cifs/misc.c @@ -32,6 +32,9 @@ #include "cifs_unicode.h" #include "smb2pdu.h" #include "cifsfs.h" +#ifdef CONFIG_CIFS_DFS_UPCALL +#include "dns_resolve.h" +#endif extern mempool_t *cifs_sm_req_poolp; extern mempool_t *cifs_req_poolp; @@ -1083,6 +1086,51 @@ void cifs_put_tcp_super(struct super_block *sb) } #ifdef CONFIG_CIFS_DFS_UPCALL +int match_target_ip(struct TCP_Server_Info *server, + const char *share, size_t share_len, + bool *result) +{ + int rc; + char *target, *tip = NULL; + struct sockaddr tipaddr; + + *result = false; + + target = kzalloc(share_len + 3, GFP_KERNEL); + if (!target) { + rc = -ENOMEM; + goto out; + } + + scnprintf(target, share_len + 3, "\\\\%.*s", (int)share_len, share); + + cifs_dbg(FYI, "%s: target name: %s\n", __func__, target + 2); + + rc = dns_resolve_server_name_to_ip(target, &tip); + if (rc < 0) + goto out; + + cifs_dbg(FYI, "%s: target ip: %s\n", __func__, tip); + + if (!cifs_convert_address(&tipaddr, tip, strlen(tip))) { + cifs_dbg(VFS, "%s: failed to convert target ip address\n", + __func__); + rc = -EINVAL; + goto out; + } + + *result = cifs_match_ipaddr((struct sockaddr *)&server->dstaddr, + &tipaddr); + cifs_dbg(FYI, "%s: ip addresses match: %u\n", __func__, *result); + rc = 0; + +out: + kfree(target); + kfree(tip); + + return rc; +} + static void tcon_super_cb(struct super_block *sb, void *arg) { struct super_cb_data *sd = arg; |