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 // SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * NetLabel CALIPSO/IPv6 Support
  *
  * This file defines the CALIPSO/IPv6 functions for the NetLabel system.  The
  * NetLabel system manages static and dynamic label mappings for network
  * protocols such as CIPSO and CALIPSO.
  *
  * Authors: Paul Moore <paul@paul-moore.com>
  *          Huw Davies <huw@codeweavers.com>
  */
 
 /* (c) Copyright Hewlett-Packard Development Company, L.P., 2006
  * (c) Copyright Huw Davies <huw@codeweavers.com>, 2015
  */
 
 #include <linux/types.h>
 #include <linux/socket.h>
 #include <linux/string.h>
 #include <linux/skbuff.h>
 #include <linux/audit.h>
 #include <linux/slab.h>
 #include <net/sock.h>
 #include <net/netlink.h>
 #include <net/genetlink.h>
 #include <net/netlabel.h>
 #include <net/calipso.h>
 #include <linux/atomic.h>
 
 #include "netlabel_user.h"
 #include "netlabel_calipso.h"
 #include "netlabel_mgmt.h"
 #include "netlabel_domainhash.h"
 
 /* Argument struct for calipso_doi_walk() */
 struct netlbl_calipso_doiwalk_arg {
     struct netlink_callback *nl_cb;
     struct sk_buff *skb;
     u32 seq;
 };
 
 /* Argument struct for netlbl_domhsh_walk() */
 struct netlbl_domhsh_walk_arg {
     struct netlbl_audit *audit_info;
     u32 doi;
 };
 
 /* NetLabel Generic NETLINK CALIPSO family */
 static struct genl_family netlbl_calipso_gnl_family;
 
 /* NetLabel Netlink attribute policy */
 static const struct nla_policy calipso_genl_policy[NLBL_CALIPSO_A_MAX + 1] = {
     [NLBL_CALIPSO_A_DOI] = { .type = NLA_U32 },
     [NLBL_CALIPSO_A_MTYPE] = { .type = NLA_U32 },
 };
 
 /* NetLabel Command Handlers
  */
 /**
  * netlbl_calipso_add_pass - Adds a CALIPSO pass DOI definition
  * @info: the Generic NETLINK info block
  * @audit_info: NetLabel audit information
  *
  * Description:
  * Create a new CALIPSO_MAP_PASS DOI definition based on the given ADD message
  * and add it to the CALIPSO engine.  Return zero on success and non-zero on
  * error.
  *
  */
 static int netlbl_calipso_add_pass(struct genl_info *info,
                    struct netlbl_audit *audit_info)
 {
     int ret_val;
     struct calipso_doi *doi_def = NULL;
 
     doi_def = kmalloc(sizeof(*doi_def), GFP_KERNEL);
     if (!doi_def)
         return -ENOMEM;
     doi_def->type = CALIPSO_MAP_PASS;
     doi_def->doi = nla_get_u32(info->attrs[NLBL_CALIPSO_A_DOI]);
     ret_val = calipso_doi_add(doi_def, audit_info);
     if (ret_val != 0)
         calipso_doi_free(doi_def);
 
     return ret_val;
 }
 
 /**
  * netlbl_calipso_add - Handle an ADD message
  * @skb: the NETLINK buffer
  * @info: the Generic NETLINK info block
  *
  * Description:
  * Create a new DOI definition based on the given ADD message and add it to the
  * CALIPSO engine.  Returns zero on success, negative values on failure.
  *
  */
 static int netlbl_calipso_add(struct sk_buff *skb, struct genl_info *info)
 
 {
     int ret_val = -EINVAL;
     struct netlbl_audit audit_info;
 
     if (!info->attrs[NLBL_CALIPSO_A_DOI] ||
         !info->attrs[NLBL_CALIPSO_A_MTYPE])
         return -EINVAL;
 
     netlbl_netlink_auditinfo(&audit_info);
     switch (nla_get_u32(info->attrs[NLBL_CALIPSO_A_MTYPE])) {
     case CALIPSO_MAP_PASS:
         ret_val = netlbl_calipso_add_pass(info, &audit_info);
         break;
     }
     if (ret_val == 0)
         atomic_inc(&netlabel_mgmt_protocount);
 
     return ret_val;
 }
 
 /**
  * netlbl_calipso_list - Handle a LIST message
  * @skb: the NETLINK buffer
  * @info: the Generic NETLINK info block
  *
  * Description:
  * Process a user generated LIST message and respond accordingly.
  * Returns zero on success and negative values on error.
  *
  */
 static int netlbl_calipso_list(struct sk_buff *skb, struct genl_info *info)
 {
     int ret_val;
     struct sk_buff *ans_skb = NULL;
     void *data;
     u32 doi;
     struct calipso_doi *doi_def;
 
     if (!info->attrs[NLBL_CALIPSO_A_DOI]) {
         ret_val = -EINVAL;
         goto list_failure;
     }
 
     doi = nla_get_u32(info->attrs[NLBL_CALIPSO_A_DOI]);
 
     doi_def = calipso_doi_getdef(doi);
     if (!doi_def) {
         ret_val = -EINVAL;
         goto list_failure;
     }
 
     ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
     if (!ans_skb) {
         ret_val = -ENOMEM;
         goto list_failure_put;
     }
     data = genlmsg_put_reply(ans_skb, info, &netlbl_calipso_gnl_family,
                  0, NLBL_CALIPSO_C_LIST);
     if (!data) {
         ret_val = -ENOMEM;
         goto list_failure_put;
     }
 
     ret_val = nla_put_u32(ans_skb, NLBL_CALIPSO_A_MTYPE, doi_def->type);
     if (ret_val != 0)
         goto list_failure_put;
 
     calipso_doi_putdef(doi_def);
 
     genlmsg_end(ans_skb, data);
     return genlmsg_reply(ans_skb, info);
 
 list_failure_put:
     calipso_doi_putdef(doi_def);
 list_failure:
     kfree_skb(ans_skb);
     return ret_val;
 }
 
 /**
  * netlbl_calipso_listall_cb - calipso_doi_walk() callback for LISTALL
  * @doi_def: the CALIPSO DOI definition
  * @arg: the netlbl_calipso_doiwalk_arg structure
  *
  * Description:
  * This function is designed to be used as a callback to the
  * calipso_doi_walk() function for use in generating a response for a LISTALL
  * message.  Returns the size of the message on success, negative values on
  * failure.
  *
  */
 static int netlbl_calipso_listall_cb(struct calipso_doi *doi_def, void *arg)
 {
     int ret_val = -ENOMEM;
     struct netlbl_calipso_doiwalk_arg *cb_arg = arg;
     void *data;
 
     data = genlmsg_put(cb_arg->skb, NETLINK_CB(cb_arg->nl_cb->skb).portid,
                cb_arg->seq, &netlbl_calipso_gnl_family,
                NLM_F_MULTI, NLBL_CALIPSO_C_LISTALL);
     if (!data)
         goto listall_cb_failure;
 
     ret_val = nla_put_u32(cb_arg->skb, NLBL_CALIPSO_A_DOI, doi_def->doi);
     if (ret_val != 0)
         goto listall_cb_failure;
     ret_val = nla_put_u32(cb_arg->skb,
                   NLBL_CALIPSO_A_MTYPE,
                   doi_def->type);
     if (ret_val != 0)
         goto listall_cb_failure;
 
     genlmsg_end(cb_arg->skb, data);
     return 0;
 
 listall_cb_failure:
     genlmsg_cancel(cb_arg->skb, data);
     return ret_val;
 }
 
 /**
  * netlbl_calipso_listall - Handle a LISTALL message
  * @skb: the NETLINK buffer
  * @cb: the NETLINK callback
  *
  * Description:
  * Process a user generated LISTALL message and respond accordingly.  Returns
  * zero on success and negative values on error.
  *
  */
 static int netlbl_calipso_listall(struct sk_buff *skb,
                   struct netlink_callback *cb)
 {
     struct netlbl_calipso_doiwalk_arg cb_arg;
     u32 doi_skip = cb->args[0];
 
     cb_arg.nl_cb = cb;
     cb_arg.skb = skb;
     cb_arg.seq = cb->nlh->nlmsg_seq;
 
     calipso_doi_walk(&doi_skip, netlbl_calipso_listall_cb, &cb_arg);
 
     cb->args[0] = doi_skip;
     return skb->len;
 }
 
 /**
  * netlbl_calipso_remove_cb - netlbl_calipso_remove() callback for REMOVE
  * @entry: LSM domain mapping entry
  * @arg: the netlbl_domhsh_walk_arg structure
  *
  * Description:
  * This function is intended for use by netlbl_calipso_remove() as the callback
  * for the netlbl_domhsh_walk() function; it removes LSM domain map entries
  * which are associated with the CALIPSO DOI specified in @arg.  Returns zero on
  * success, negative values on failure.
  *
  */
 static int netlbl_calipso_remove_cb(struct netlbl_dom_map *entry, void *arg)
 {
     struct netlbl_domhsh_walk_arg *cb_arg = arg;
 
     if (entry->def.type == NETLBL_NLTYPE_CALIPSO &&
         entry->def.calipso->doi == cb_arg->doi)
         return netlbl_domhsh_remove_entry(entry, cb_arg->audit_info);
 
     return 0;
 }
 
 /**
  * netlbl_calipso_remove - Handle a REMOVE message
  * @skb: the NETLINK buffer
  * @info: the Generic NETLINK info block
  *
  * Description:
  * Process a user generated REMOVE message and respond accordingly.  Returns
  * zero on success, negative values on failure.
  *
  */
 static int netlbl_calipso_remove(struct sk_buff *skb, struct genl_info *info)
 {
     int ret_val = -EINVAL;
     struct netlbl_domhsh_walk_arg cb_arg;
     struct netlbl_audit audit_info;
     u32 skip_bkt = 0;
     u32 skip_chain = 0;
 
     if (!info->attrs[NLBL_CALIPSO_A_DOI])
         return -EINVAL;
 
     netlbl_netlink_auditinfo(&audit_info);
     cb_arg.doi = nla_get_u32(info->attrs[NLBL_CALIPSO_A_DOI]);
     cb_arg.audit_info = &audit_info;
     ret_val = netlbl_domhsh_walk(&skip_bkt, &skip_chain,
                      netlbl_calipso_remove_cb, &cb_arg);
     if (ret_val == 0 || ret_val == -ENOENT) {
         ret_val = calipso_doi_remove(cb_arg.doi, &audit_info);
         if (ret_val == 0)
             atomic_dec(&netlabel_mgmt_protocount);
     }
 
     return ret_val;
 }
 
 /* NetLabel Generic NETLINK Command Definitions
  */
 
 static const struct genl_small_ops netlbl_calipso_ops[] = {
     {
     .cmd = NLBL_CALIPSO_C_ADD,
     .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
     .flags = GENL_ADMIN_PERM,
     .doit = netlbl_calipso_add,
     .dumpit = NULL,
     },
     {
     .cmd = NLBL_CALIPSO_C_REMOVE,
     .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
     .flags = GENL_ADMIN_PERM,
     .doit = netlbl_calipso_remove,
     .dumpit = NULL,
     },
     {
     .cmd = NLBL_CALIPSO_C_LIST,
     .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
     .flags = 0,
     .doit = netlbl_calipso_list,
     .dumpit = NULL,
     },
     {
     .cmd = NLBL_CALIPSO_C_LISTALL,
     .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
     .flags = 0,
     .doit = NULL,
     .dumpit = netlbl_calipso_listall,
     },
 };
 
 static struct genl_family netlbl_calipso_gnl_family __ro_after_init = {
     .hdrsize = 0,
     .name = NETLBL_NLTYPE_CALIPSO_NAME,
     .version = NETLBL_PROTO_VERSION,
     .maxattr = NLBL_CALIPSO_A_MAX,
     .policy = calipso_genl_policy,
     .module = THIS_MODULE,
     .small_ops = netlbl_calipso_ops,
     .n_small_ops = ARRAY_SIZE(netlbl_calipso_ops),
 };
 
 /* NetLabel Generic NETLINK Protocol Functions
  */
 
 /**
  * netlbl_calipso_genl_init - Register the CALIPSO NetLabel component
  *
  * Description:
  * Register the CALIPSO packet NetLabel component with the Generic NETLINK
  * mechanism.  Returns zero on success, negative values on failure.
  *
  */
 int __init netlbl_calipso_genl_init(void)
 {
     return genl_register_family(&netlbl_calipso_gnl_family);
 }
 
 static const struct netlbl_calipso_ops *calipso_ops;
 
 /**
  * netlbl_calipso_ops_register - Register the CALIPSO operations
  * @ops: ops to register
  *
  * Description:
  * Register the CALIPSO packet engine operations.
  *
  */
 const struct netlbl_calipso_ops *
 netlbl_calipso_ops_register(const struct netlbl_calipso_ops *ops)
 {
     return xchg(&calipso_ops, ops);
 }
 EXPORT_SYMBOL(netlbl_calipso_ops_register);
 
 static const struct netlbl_calipso_ops *netlbl_calipso_ops_get(void)
 {
     return READ_ONCE(calipso_ops);
 }
 
 /**
  * calipso_doi_add - Add a new DOI to the CALIPSO protocol engine
  * @doi_def: the DOI structure
  * @audit_info: NetLabel audit information
  *
  * Description:
  * The caller defines a new DOI for use by the CALIPSO engine and calls this
  * function to add it to the list of acceptable domains.  The caller must
  * ensure that the mapping table specified in @doi_def->map meets all of the
  * requirements of the mapping type (see calipso.h for details).  Returns
  * zero on success and non-zero on failure.
  *
  */
 int calipso_doi_add(struct calipso_doi *doi_def,
             struct netlbl_audit *audit_info)
 {
     int ret_val = -ENOMSG;
     const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
 
     if (ops)
         ret_val = ops->doi_add(doi_def, audit_info);
     return ret_val;
 }
 
 /**
  * calipso_doi_free - Frees a DOI definition
  * @doi_def: the DOI definition
  *
  * Description:
  * This function frees all of the memory associated with a DOI definition.
  *
  */
 void calipso_doi_free(struct calipso_doi *doi_def)
 {
     const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
 
     if (ops)
         ops->doi_free(doi_def);
 }
 
 /**
  * calipso_doi_remove - Remove an existing DOI from the CALIPSO protocol engine
  * @doi: the DOI value
  * @audit_info: NetLabel audit information
  *
  * Description:
  * Removes a DOI definition from the CALIPSO engine.  The NetLabel routines will
  * be called to release their own LSM domain mappings as well as our own
  * domain list.  Returns zero on success and negative values on failure.
  *
  */
 int calipso_doi_remove(u32 doi, struct netlbl_audit *audit_info)
 {
     int ret_val = -ENOMSG;
     const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
 
     if (ops)
         ret_val = ops->doi_remove(doi, audit_info);
     return ret_val;
 }
 
 /**
  * calipso_doi_getdef - Returns a reference to a valid DOI definition
  * @doi: the DOI value
  *
  * Description:
  * Searches for a valid DOI definition and if one is found it is returned to
  * the caller.  Otherwise NULL is returned.  The caller must ensure that
  * calipso_doi_putdef() is called when the caller is done.
  *
  */
 struct calipso_doi *calipso_doi_getdef(u32 doi)
 {
     struct calipso_doi *ret_val = NULL;
     const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
 
     if (ops)
         ret_val = ops->doi_getdef(doi);
     return ret_val;
 }
 
 /**
  * calipso_doi_putdef - Releases a reference for the given DOI definition
  * @doi_def: the DOI definition
  *
  * Description:
  * Releases a DOI definition reference obtained from calipso_doi_getdef().
  *
  */
 void calipso_doi_putdef(struct calipso_doi *doi_def)
 {
     const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
 
     if (ops)
         ops->doi_putdef(doi_def);
 }
 
 /**
  * calipso_doi_walk - Iterate through the DOI definitions
  * @skip_cnt: skip past this number of DOI definitions, updated
  * @callback: callback for each DOI definition
  * @cb_arg: argument for the callback function
  *
  * Description:
  * Iterate over the DOI definition list, skipping the first @skip_cnt entries.
  * For each entry call @callback, if @callback returns a negative value stop
  * 'walking' through the list and return.  Updates the value in @skip_cnt upon
  * return.  Returns zero on success, negative values on failure.
  *
  */
 int calipso_doi_walk(u32 *skip_cnt,
              int (*callback)(struct calipso_doi *doi_def, void *arg),
              void *cb_arg)
 {
     int ret_val = -ENOMSG;
     const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
 
     if (ops)
         ret_val = ops->doi_walk(skip_cnt, callback, cb_arg);
     return ret_val;
 }
 
 /**
  * calipso_sock_getattr - Get the security attributes from a sock
  * @sk: the sock
  * @secattr: the security attributes
  *
  * Description:
  * Query @sk to see if there is a CALIPSO option attached to the sock and if
  * there is return the CALIPSO security attributes in @secattr.  This function
  * requires that @sk be locked, or privately held, but it does not do any
  * locking itself.  Returns zero on success and negative values on failure.
  *
  */
 int calipso_sock_getattr(struct sock *sk, struct netlbl_lsm_secattr *secattr)
 {
     int ret_val = -ENOMSG;
     const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
 
     if (ops)
         ret_val = ops->sock_getattr(sk, secattr);
     return ret_val;
 }
 
 /**
  * calipso_sock_setattr - Add a CALIPSO option to a socket
  * @sk: the socket
  * @doi_def: the CALIPSO DOI to use
  * @secattr: the specific security attributes of the socket
  *
  * Description:
  * Set the CALIPSO option on the given socket using the DOI definition and
  * security attributes passed to the function.  This function requires
  * exclusive access to @sk, which means it either needs to be in the
  * process of being created or locked.  Returns zero on success and negative
  * values on failure.
  *
  */
 int calipso_sock_setattr(struct sock *sk,
              const struct calipso_doi *doi_def,
              const struct netlbl_lsm_secattr *secattr)
 {
     int ret_val = -ENOMSG;
     const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
 
     if (ops)
         ret_val = ops->sock_setattr(sk, doi_def, secattr);
     return ret_val;
 }
 
 /**
  * calipso_sock_delattr - Delete the CALIPSO option from a socket
  * @sk: the socket
  *
  * Description:
  * Removes the CALIPSO option from a socket, if present.
  *
  */
 void calipso_sock_delattr(struct sock *sk)
 {
     const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
 
     if (ops)
         ops->sock_delattr(sk);
 }
 
 /**
  * calipso_req_setattr - Add a CALIPSO option to a connection request socket
  * @req: the connection request socket
  * @doi_def: the CALIPSO DOI to use
  * @secattr: the specific security attributes of the socket
  *
  * Description:
  * Set the CALIPSO option on the given socket using the DOI definition and
  * security attributes passed to the function.  Returns zero on success and
  * negative values on failure.
  *
  */
 int calipso_req_setattr(struct request_sock *req,
             const struct calipso_doi *doi_def,
             const struct netlbl_lsm_secattr *secattr)
 {
     int ret_val = -ENOMSG;
     const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
 
     if (ops)
         ret_val = ops->req_setattr(req, doi_def, secattr);
     return ret_val;
 }
 
 /**
  * calipso_req_delattr - Delete the CALIPSO option from a request socket
  * @req: the request socket
  *
  * Description:
  * Removes the CALIPSO option from a request socket, if present.
  *
  */
 void calipso_req_delattr(struct request_sock *req)
 {
     const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
 
     if (ops)
         ops->req_delattr(req);
 }
 
 /**
  * calipso_optptr - Find the CALIPSO option in the packet
  * @skb: the packet
  *
  * Description:
  * Parse the packet's IP header looking for a CALIPSO option.  Returns a pointer
  * to the start of the CALIPSO option on success, NULL if one if not found.
  *
  */
 unsigned char *calipso_optptr(const struct sk_buff *skb)
 {
     unsigned char *ret_val = NULL;
     const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
 
     if (ops)
         ret_val = ops->skbuff_optptr(skb);
     return ret_val;
 }
 
 /**
  * calipso_getattr - Get the security attributes from a memory block.
  * @calipso: the CALIPSO option
  * @secattr: the security attributes
  *
  * Description:
  * Inspect @calipso and return the security attributes in @secattr.
  * Returns zero on success and negative values on failure.
  *
  */
 int calipso_getattr(const unsigned char *calipso,
             struct netlbl_lsm_secattr *secattr)
 {
     int ret_val = -ENOMSG;
     const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
 
     if (ops)
         ret_val = ops->opt_getattr(calipso, secattr);
     return ret_val;
 }
 
 /**
  * calipso_skbuff_setattr - Set the CALIPSO option on a packet
  * @skb: the packet
  * @doi_def: the CALIPSO DOI to use
  * @secattr: the security attributes
  *
  * Description:
  * Set the CALIPSO option on the given packet based on the security attributes.
  * Returns a pointer to the IP header on success and NULL on failure.
  *
  */
 int calipso_skbuff_setattr(struct sk_buff *skb,
                const struct calipso_doi *doi_def,
                const struct netlbl_lsm_secattr *secattr)
 {
     int ret_val = -ENOMSG;
     const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
 
     if (ops)
         ret_val = ops->skbuff_setattr(skb, doi_def, secattr);
     return ret_val;
 }
 
 /**
  * calipso_skbuff_delattr - Delete any CALIPSO options from a packet
  * @skb: the packet
  *
  * Description:
  * Removes any and all CALIPSO options from the given packet.  Returns zero on
  * success, negative values on failure.
  *
  */
 int calipso_skbuff_delattr(struct sk_buff *skb)
 {
     int ret_val = -ENOMSG;
     const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
 
     if (ops)
         ret_val = ops->skbuff_delattr(skb);
     return ret_val;
 }
 
 /**
  * calipso_cache_invalidate - Invalidates the current CALIPSO cache
  *
  * Description:
  * Invalidates and frees any entries in the CALIPSO cache.  Returns zero on
  * success and negative values on failure.
  *
  */
 void calipso_cache_invalidate(void)
 {
     const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
 
     if (ops)
         ops->cache_invalidate();
 }
 
 /**
  * calipso_cache_add - Add an entry to the CALIPSO cache
  * @calipso_ptr: the CALIPSO option
  * @secattr: the packet's security attributes
  *
  * Description:
  * Add a new entry into the CALIPSO label mapping cache.
  * Returns zero on success, negative values on failure.
  *
  */
 int calipso_cache_add(const unsigned char *calipso_ptr,
               const struct netlbl_lsm_secattr *secattr)
 
 {
     int ret_val = -ENOMSG;
     const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
 
     if (ops)
         ret_val = ops->cache_add(calipso_ptr, secattr);
     return ret_val;
 }

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