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linux/net/netlabel/netlabel_mgmt.c
Johannes Berg a885a6b2d3 net: convert to nla_get_*_default() 
Most of the original conversion is from the spatch below,
but I edited some and left out other instances that were
either buggy after conversion (where default values don't
fit into the type) or just looked strange.

    @@
    expression attr, def;
    expression val;
    identifier fn =~ "^nla_get_.*";
    fresh identifier dfn = fn ## "_default";
    @@
    (
    -if (attr)
    -  val = fn(attr);
    -else
    -  val = def;
    +val = dfn(attr, def);
    |
    -if (!attr)
    -  val = def;
    -else
    -  val = fn(attr);
    +val = dfn(attr, def);
    |
    -if (!attr)
    -  return def;
    -return fn(attr);
    +return dfn(attr, def);
    |
    -attr ? fn(attr) : def
    +dfn(attr, def)
    |
    -!attr ? def : fn(attr)
    +dfn(attr, def)
    )

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Reviewed-by: Toke Høiland-Jørgensen <toke@kernel.org>
Link: https://patch.msgid.link/20241108114145.0580b8684e7f.I740beeaa2f70ebfc19bfca1045a24d6151992790@changeid
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2024-11-11 10:32:06 -08:00

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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* NetLabel Management Support
*
* This file defines the management functions for the NetLabel system. The
* NetLabel system manages static and dynamic label mappings for network
* protocols such as CIPSO and RIPSO.
*
* Author: Paul Moore <paul@paul-moore.com>
*/
/*
* (c) Copyright Hewlett-Packard Development Company, L.P., 2006, 2008
*/
#include <linux/types.h>
#include <linux/socket.h>
#include <linux/string.h>
#include <linux/skbuff.h>
#include <linux/in.h>
#include <linux/in6.h>
#include <linux/slab.h>
#include <net/sock.h>
#include <net/netlink.h>
#include <net/genetlink.h>
#include <net/ip.h>
#include <net/ipv6.h>
#include <net/netlabel.h>
#include <net/cipso_ipv4.h>
#include <net/calipso.h>
#include <linux/atomic.h>
#include "netlabel_calipso.h"
#include "netlabel_domainhash.h"
#include "netlabel_user.h"
#include "netlabel_mgmt.h"
/* NetLabel configured protocol counter */
atomic_t netlabel_mgmt_protocount = ATOMIC_INIT(0);
/* Argument struct for netlbl_domhsh_walk() */
struct netlbl_domhsh_walk_arg {
struct netlink_callback *nl_cb;
struct sk_buff *skb;
u32 seq;
};
/* NetLabel Generic NETLINK CIPSOv4 family */
static struct genl_family netlbl_mgmt_gnl_family;
/* NetLabel Netlink attribute policy */
static const struct nla_policy netlbl_mgmt_genl_policy[NLBL_MGMT_A_MAX + 1] = {
[NLBL_MGMT_A_DOMAIN] = { .type = NLA_NUL_STRING },
[NLBL_MGMT_A_PROTOCOL] = { .type = NLA_U32 },
[NLBL_MGMT_A_VERSION] = { .type = NLA_U32 },
[NLBL_MGMT_A_CV4DOI] = { .type = NLA_U32 },
[NLBL_MGMT_A_FAMILY] = { .type = NLA_U16 },
[NLBL_MGMT_A_CLPDOI] = { .type = NLA_U32 },
};
/*
* Helper Functions
*/
/**
* netlbl_mgmt_add_common - Handle an ADD message
* @info: the Generic NETLINK info block
* @audit_info: NetLabel audit information
*
* Description:
* Helper function for the ADD and ADDDEF messages to add the domain mappings
* from the message to the hash table. See netlabel.h for a description of the
* message format. Returns zero on success, negative values on failure.
*
*/
static int netlbl_mgmt_add_common(struct genl_info *info,
struct netlbl_audit *audit_info)
{
void *pmap = NULL;
int ret_val = -EINVAL;
struct netlbl_domaddr_map *addrmap = NULL;
struct cipso_v4_doi *cipsov4 = NULL;
#if IS_ENABLED(CONFIG_IPV6)
struct calipso_doi *calipso = NULL;
#endif
u32 tmp_val;
struct netlbl_dom_map *entry = kzalloc(sizeof(*entry), GFP_KERNEL);
if (!entry)
return -ENOMEM;
entry->def.type = nla_get_u32(info->attrs[NLBL_MGMT_A_PROTOCOL]);
if (info->attrs[NLBL_MGMT_A_DOMAIN]) {
size_t tmp_size = nla_len(info->attrs[NLBL_MGMT_A_DOMAIN]);
entry->domain = kmalloc(tmp_size, GFP_KERNEL);
if (entry->domain == NULL) {
ret_val = -ENOMEM;
goto add_free_entry;
}
nla_strscpy(entry->domain,
info->attrs[NLBL_MGMT_A_DOMAIN], tmp_size);
}
/* NOTE: internally we allow/use a entry->def.type value of
* NETLBL_NLTYPE_ADDRSELECT but we don't currently allow users
* to pass that as a protocol value because we need to know the
* "real" protocol */
switch (entry->def.type) {
case NETLBL_NLTYPE_UNLABELED:
entry->family =
nla_get_u16_default(info->attrs[NLBL_MGMT_A_FAMILY],
AF_UNSPEC);
break;
case NETLBL_NLTYPE_CIPSOV4:
if (!info->attrs[NLBL_MGMT_A_CV4DOI])
goto add_free_domain;
tmp_val = nla_get_u32(info->attrs[NLBL_MGMT_A_CV4DOI]);
cipsov4 = cipso_v4_doi_getdef(tmp_val);
if (cipsov4 == NULL)
goto add_free_domain;
entry->family = AF_INET;
entry->def.cipso = cipsov4;
break;
#if IS_ENABLED(CONFIG_IPV6)
case NETLBL_NLTYPE_CALIPSO:
if (!info->attrs[NLBL_MGMT_A_CLPDOI])
goto add_free_domain;
tmp_val = nla_get_u32(info->attrs[NLBL_MGMT_A_CLPDOI]);
calipso = calipso_doi_getdef(tmp_val);
if (calipso == NULL)
goto add_free_domain;
entry->family = AF_INET6;
entry->def.calipso = calipso;
break;
#endif /* IPv6 */
default:
goto add_free_domain;
}
if ((entry->family == AF_INET && info->attrs[NLBL_MGMT_A_IPV6ADDR]) ||
(entry->family == AF_INET6 && info->attrs[NLBL_MGMT_A_IPV4ADDR]))
goto add_doi_put_def;
if (info->attrs[NLBL_MGMT_A_IPV4ADDR]) {
struct in_addr *addr;
struct in_addr *mask;
struct netlbl_domaddr4_map *map;
addrmap = kzalloc(sizeof(*addrmap), GFP_KERNEL);
if (addrmap == NULL) {
ret_val = -ENOMEM;
goto add_doi_put_def;
}
INIT_LIST_HEAD(&addrmap->list4);
INIT_LIST_HEAD(&addrmap->list6);
if (nla_len(info->attrs[NLBL_MGMT_A_IPV4ADDR]) !=
sizeof(struct in_addr)) {
ret_val = -EINVAL;
goto add_free_addrmap;
}
if (nla_len(info->attrs[NLBL_MGMT_A_IPV4MASK]) !=
sizeof(struct in_addr)) {
ret_val = -EINVAL;
goto add_free_addrmap;
}
addr = nla_data(info->attrs[NLBL_MGMT_A_IPV4ADDR]);
mask = nla_data(info->attrs[NLBL_MGMT_A_IPV4MASK]);
map = kzalloc(sizeof(*map), GFP_KERNEL);
if (map == NULL) {
ret_val = -ENOMEM;
goto add_free_addrmap;
}
pmap = map;
map->list.addr = addr->s_addr & mask->s_addr;
map->list.mask = mask->s_addr;
map->list.valid = 1;
map->def.type = entry->def.type;
if (cipsov4)
map->def.cipso = cipsov4;
ret_val = netlbl_af4list_add(&map->list, &addrmap->list4);
if (ret_val != 0)
goto add_free_map;
entry->family = AF_INET;
entry->def.type = NETLBL_NLTYPE_ADDRSELECT;
entry->def.addrsel = addrmap;
#if IS_ENABLED(CONFIG_IPV6)
} else if (info->attrs[NLBL_MGMT_A_IPV6ADDR]) {
struct in6_addr *addr;
struct in6_addr *mask;
struct netlbl_domaddr6_map *map;
addrmap = kzalloc(sizeof(*addrmap), GFP_KERNEL);
if (addrmap == NULL) {
ret_val = -ENOMEM;
goto add_doi_put_def;
}
INIT_LIST_HEAD(&addrmap->list4);
INIT_LIST_HEAD(&addrmap->list6);
if (nla_len(info->attrs[NLBL_MGMT_A_IPV6ADDR]) !=
sizeof(struct in6_addr)) {
ret_val = -EINVAL;
goto add_free_addrmap;
}
if (nla_len(info->attrs[NLBL_MGMT_A_IPV6MASK]) !=
sizeof(struct in6_addr)) {
ret_val = -EINVAL;
goto add_free_addrmap;
}
addr = nla_data(info->attrs[NLBL_MGMT_A_IPV6ADDR]);
mask = nla_data(info->attrs[NLBL_MGMT_A_IPV6MASK]);
map = kzalloc(sizeof(*map), GFP_KERNEL);
if (map == NULL) {
ret_val = -ENOMEM;
goto add_free_addrmap;
}
pmap = map;
map->list.addr = *addr;
map->list.addr.s6_addr32[0] &= mask->s6_addr32[0];
map->list.addr.s6_addr32[1] &= mask->s6_addr32[1];
map->list.addr.s6_addr32[2] &= mask->s6_addr32[2];
map->list.addr.s6_addr32[3] &= mask->s6_addr32[3];
map->list.mask = *mask;
map->list.valid = 1;
map->def.type = entry->def.type;
if (calipso)
map->def.calipso = calipso;
ret_val = netlbl_af6list_add(&map->list, &addrmap->list6);
if (ret_val != 0)
goto add_free_map;
entry->family = AF_INET6;
entry->def.type = NETLBL_NLTYPE_ADDRSELECT;
entry->def.addrsel = addrmap;
#endif /* IPv6 */
}
ret_val = netlbl_domhsh_add(entry, audit_info);
if (ret_val != 0)
goto add_free_map;
return 0;
add_free_map:
kfree(pmap);
add_free_addrmap:
kfree(addrmap);
add_doi_put_def:
cipso_v4_doi_putdef(cipsov4);
#if IS_ENABLED(CONFIG_IPV6)
calipso_doi_putdef(calipso);
#endif
add_free_domain:
kfree(entry->domain);
add_free_entry:
kfree(entry);
return ret_val;
}
/**
* netlbl_mgmt_listentry - List a NetLabel/LSM domain map entry
* @skb: the NETLINK buffer
* @entry: the map entry
*
* Description:
* This function is a helper function used by the LISTALL and LISTDEF command
* handlers. The caller is responsible for ensuring that the RCU read lock
* is held. Returns zero on success, negative values on failure.
*
*/
static int netlbl_mgmt_listentry(struct sk_buff *skb,
struct netlbl_dom_map *entry)
{
int ret_val = 0;
struct nlattr *nla_a;
struct nlattr *nla_b;
struct netlbl_af4list *iter4;
#if IS_ENABLED(CONFIG_IPV6)
struct netlbl_af6list *iter6;
#endif
if (entry->domain != NULL) {
ret_val = nla_put_string(skb,
NLBL_MGMT_A_DOMAIN, entry->domain);
if (ret_val != 0)
return ret_val;
}
ret_val = nla_put_u16(skb, NLBL_MGMT_A_FAMILY, entry->family);
if (ret_val != 0)
return ret_val;
switch (entry->def.type) {
case NETLBL_NLTYPE_ADDRSELECT:
nla_a = nla_nest_start_noflag(skb, NLBL_MGMT_A_SELECTORLIST);
if (nla_a == NULL)
return -ENOMEM;
netlbl_af4list_foreach_rcu(iter4, &entry->def.addrsel->list4) {
struct netlbl_domaddr4_map *map4;
struct in_addr addr_struct;
nla_b = nla_nest_start_noflag(skb,
NLBL_MGMT_A_ADDRSELECTOR);
if (nla_b == NULL)
return -ENOMEM;
addr_struct.s_addr = iter4->addr;
ret_val = nla_put_in_addr(skb, NLBL_MGMT_A_IPV4ADDR,
addr_struct.s_addr);
if (ret_val != 0)
return ret_val;
addr_struct.s_addr = iter4->mask;
ret_val = nla_put_in_addr(skb, NLBL_MGMT_A_IPV4MASK,
addr_struct.s_addr);
if (ret_val != 0)
return ret_val;
map4 = netlbl_domhsh_addr4_entry(iter4);
ret_val = nla_put_u32(skb, NLBL_MGMT_A_PROTOCOL,
map4->def.type);
if (ret_val != 0)
return ret_val;
switch (map4->def.type) {
case NETLBL_NLTYPE_CIPSOV4:
ret_val = nla_put_u32(skb, NLBL_MGMT_A_CV4DOI,
map4->def.cipso->doi);
if (ret_val != 0)
return ret_val;
break;
}
nla_nest_end(skb, nla_b);
}
#if IS_ENABLED(CONFIG_IPV6)
netlbl_af6list_foreach_rcu(iter6, &entry->def.addrsel->list6) {
struct netlbl_domaddr6_map *map6;
nla_b = nla_nest_start_noflag(skb,
NLBL_MGMT_A_ADDRSELECTOR);
if (nla_b == NULL)
return -ENOMEM;
ret_val = nla_put_in6_addr(skb, NLBL_MGMT_A_IPV6ADDR,
&iter6->addr);
if (ret_val != 0)
return ret_val;
ret_val = nla_put_in6_addr(skb, NLBL_MGMT_A_IPV6MASK,
&iter6->mask);
if (ret_val != 0)
return ret_val;
map6 = netlbl_domhsh_addr6_entry(iter6);
ret_val = nla_put_u32(skb, NLBL_MGMT_A_PROTOCOL,
map6->def.type);
if (ret_val != 0)
return ret_val;
switch (map6->def.type) {
case NETLBL_NLTYPE_CALIPSO:
ret_val = nla_put_u32(skb, NLBL_MGMT_A_CLPDOI,
map6->def.calipso->doi);
if (ret_val != 0)
return ret_val;
break;
}
nla_nest_end(skb, nla_b);
}
#endif /* IPv6 */
nla_nest_end(skb, nla_a);
break;
case NETLBL_NLTYPE_UNLABELED:
ret_val = nla_put_u32(skb, NLBL_MGMT_A_PROTOCOL,
entry->def.type);
break;
case NETLBL_NLTYPE_CIPSOV4:
ret_val = nla_put_u32(skb, NLBL_MGMT_A_PROTOCOL,
entry->def.type);
if (ret_val != 0)
return ret_val;
ret_val = nla_put_u32(skb, NLBL_MGMT_A_CV4DOI,
entry->def.cipso->doi);
break;
case NETLBL_NLTYPE_CALIPSO:
ret_val = nla_put_u32(skb, NLBL_MGMT_A_PROTOCOL,
entry->def.type);
if (ret_val != 0)
return ret_val;
ret_val = nla_put_u32(skb, NLBL_MGMT_A_CLPDOI,
entry->def.calipso->doi);
break;
}
return ret_val;
}
/*
* NetLabel Command Handlers
*/
/**
* netlbl_mgmt_add - Handle an ADD message
* @skb: the NETLINK buffer
* @info: the Generic NETLINK info block
*
* Description:
* Process a user generated ADD message and add the domains from the message
* to the hash table. See netlabel.h for a description of the message format.
* Returns zero on success, negative values on failure.
*
*/
static int netlbl_mgmt_add(struct sk_buff *skb, struct genl_info *info)
{
struct netlbl_audit audit_info;
if ((!info->attrs[NLBL_MGMT_A_DOMAIN]) ||
(!info->attrs[NLBL_MGMT_A_PROTOCOL]) ||
(info->attrs[NLBL_MGMT_A_IPV4ADDR] &&
info->attrs[NLBL_MGMT_A_IPV6ADDR]) ||
(info->attrs[NLBL_MGMT_A_IPV4MASK] &&
info->attrs[NLBL_MGMT_A_IPV6MASK]) ||
((info->attrs[NLBL_MGMT_A_IPV4ADDR] != NULL) ^
(info->attrs[NLBL_MGMT_A_IPV4MASK] != NULL)) ||
((info->attrs[NLBL_MGMT_A_IPV6ADDR] != NULL) ^
(info->attrs[NLBL_MGMT_A_IPV6MASK] != NULL)))
return -EINVAL;
netlbl_netlink_auditinfo(&audit_info);
return netlbl_mgmt_add_common(info, &audit_info);
}
/**
* netlbl_mgmt_remove - Handle a REMOVE message
* @skb: the NETLINK buffer
* @info: the Generic NETLINK info block
*
* Description:
* Process a user generated REMOVE message and remove the specified domain
* mappings. Returns zero on success, negative values on failure.
*
*/
static int netlbl_mgmt_remove(struct sk_buff *skb, struct genl_info *info)
{
char *domain;
struct netlbl_audit audit_info;
if (!info->attrs[NLBL_MGMT_A_DOMAIN])
return -EINVAL;
netlbl_netlink_auditinfo(&audit_info);
domain = nla_data(info->attrs[NLBL_MGMT_A_DOMAIN]);
return netlbl_domhsh_remove(domain, AF_UNSPEC, &audit_info);
}
/**
* netlbl_mgmt_listall_cb - netlbl_domhsh_walk() callback for LISTALL
* @entry: the domain mapping hash table entry
* @arg: the netlbl_domhsh_walk_arg structure
*
* Description:
* This function is designed to be used as a callback to the
* netlbl_domhsh_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_mgmt_listall_cb(struct netlbl_dom_map *entry, void *arg)
{
int ret_val = -ENOMEM;
struct netlbl_domhsh_walk_arg *cb_arg = arg;
void *data;
data = genlmsg_put(cb_arg->skb, NETLINK_CB(cb_arg->nl_cb->skb).portid,
cb_arg->seq, &netlbl_mgmt_gnl_family,
NLM_F_MULTI, NLBL_MGMT_C_LISTALL);
if (data == NULL)
goto listall_cb_failure;
ret_val = netlbl_mgmt_listentry(cb_arg->skb, entry);
if (ret_val != 0)
goto listall_cb_failure;
cb_arg->seq++;
genlmsg_end(cb_arg->skb, data);
return 0;
listall_cb_failure:
genlmsg_cancel(cb_arg->skb, data);
return ret_val;
}
/**
* netlbl_mgmt_listall - Handle a LISTALL message
* @skb: the NETLINK buffer
* @cb: the NETLINK callback
*
* Description:
* Process a user generated LISTALL message and dumps the domain hash table in
* a form suitable for use in a kernel generated LISTALL message. Returns zero
* on success, negative values on failure.
*
*/
static int netlbl_mgmt_listall(struct sk_buff *skb,
struct netlink_callback *cb)
{
struct netlbl_domhsh_walk_arg cb_arg;
u32 skip_bkt = cb->args[0];
u32 skip_chain = cb->args[1];
cb_arg.nl_cb = cb;
cb_arg.skb = skb;
cb_arg.seq = cb->nlh->nlmsg_seq;
netlbl_domhsh_walk(&skip_bkt,
&skip_chain,
netlbl_mgmt_listall_cb,
&cb_arg);
cb->args[0] = skip_bkt;
cb->args[1] = skip_chain;
return skb->len;
}
/**
* netlbl_mgmt_adddef - Handle an ADDDEF message
* @skb: the NETLINK buffer
* @info: the Generic NETLINK info block
*
* Description:
* Process a user generated ADDDEF message and respond accordingly. Returns
* zero on success, negative values on failure.
*
*/
static int netlbl_mgmt_adddef(struct sk_buff *skb, struct genl_info *info)
{
struct netlbl_audit audit_info;
if ((!info->attrs[NLBL_MGMT_A_PROTOCOL]) ||
(info->attrs[NLBL_MGMT_A_IPV4ADDR] &&
info->attrs[NLBL_MGMT_A_IPV6ADDR]) ||
(info->attrs[NLBL_MGMT_A_IPV4MASK] &&
info->attrs[NLBL_MGMT_A_IPV6MASK]) ||
((info->attrs[NLBL_MGMT_A_IPV4ADDR] != NULL) ^
(info->attrs[NLBL_MGMT_A_IPV4MASK] != NULL)) ||
((info->attrs[NLBL_MGMT_A_IPV6ADDR] != NULL) ^
(info->attrs[NLBL_MGMT_A_IPV6MASK] != NULL)))
return -EINVAL;
netlbl_netlink_auditinfo(&audit_info);
return netlbl_mgmt_add_common(info, &audit_info);
}
/**
* netlbl_mgmt_removedef - Handle a REMOVEDEF message
* @skb: the NETLINK buffer
* @info: the Generic NETLINK info block
*
* Description:
* Process a user generated REMOVEDEF message and remove the default domain
* mapping. Returns zero on success, negative values on failure.
*
*/
static int netlbl_mgmt_removedef(struct sk_buff *skb, struct genl_info *info)
{
struct netlbl_audit audit_info;
netlbl_netlink_auditinfo(&audit_info);
return netlbl_domhsh_remove_default(AF_UNSPEC, &audit_info);
}
/**
* netlbl_mgmt_listdef - Handle a LISTDEF message
* @skb: the NETLINK buffer
* @info: the Generic NETLINK info block
*
* Description:
* Process a user generated LISTDEF message and dumps the default domain
* mapping in a form suitable for use in a kernel generated LISTDEF message.
* Returns zero on success, negative values on failure.
*
*/
static int netlbl_mgmt_listdef(struct sk_buff *skb, struct genl_info *info)
{
int ret_val = -ENOMEM;
struct sk_buff *ans_skb = NULL;
void *data;
struct netlbl_dom_map *entry;
u16 family;
family = nla_get_u16_default(info->attrs[NLBL_MGMT_A_FAMILY], AF_INET);
ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
if (ans_skb == NULL)
return -ENOMEM;
data = genlmsg_put_reply(ans_skb, info, &netlbl_mgmt_gnl_family,
0, NLBL_MGMT_C_LISTDEF);
if (data == NULL)
goto listdef_failure;
rcu_read_lock();
entry = netlbl_domhsh_getentry(NULL, family);
if (entry == NULL) {
ret_val = -ENOENT;
goto listdef_failure_lock;
}
ret_val = netlbl_mgmt_listentry(ans_skb, entry);
rcu_read_unlock();
if (ret_val != 0)
goto listdef_failure;
genlmsg_end(ans_skb, data);
return genlmsg_reply(ans_skb, info);
listdef_failure_lock:
rcu_read_unlock();
listdef_failure:
kfree_skb(ans_skb);
return ret_val;
}
/**
* netlbl_mgmt_protocols_cb - Write an individual PROTOCOL message response
* @skb: the skb to write to
* @cb: the NETLINK callback
* @protocol: the NetLabel protocol to use in the message
*
* Description:
* This function is to be used in conjunction with netlbl_mgmt_protocols() to
* answer a application's PROTOCOLS message. Returns the size of the message
* on success, negative values on failure.
*
*/
static int netlbl_mgmt_protocols_cb(struct sk_buff *skb,
struct netlink_callback *cb,
u32 protocol)
{
int ret_val = -ENOMEM;
void *data;
data = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
&netlbl_mgmt_gnl_family, NLM_F_MULTI,
NLBL_MGMT_C_PROTOCOLS);
if (data == NULL)
goto protocols_cb_failure;
ret_val = nla_put_u32(skb, NLBL_MGMT_A_PROTOCOL, protocol);
if (ret_val != 0)
goto protocols_cb_failure;
genlmsg_end(skb, data);
return 0;
protocols_cb_failure:
genlmsg_cancel(skb, data);
return ret_val;
}
/**
* netlbl_mgmt_protocols - Handle a PROTOCOLS message
* @skb: the NETLINK buffer
* @cb: the NETLINK callback
*
* Description:
* Process a user generated PROTOCOLS message and respond accordingly.
*
*/
static int netlbl_mgmt_protocols(struct sk_buff *skb,
struct netlink_callback *cb)
{
u32 protos_sent = cb->args[0];
if (protos_sent == 0) {
if (netlbl_mgmt_protocols_cb(skb,
cb,
NETLBL_NLTYPE_UNLABELED) < 0)
goto protocols_return;
protos_sent++;
}
if (protos_sent == 1) {
if (netlbl_mgmt_protocols_cb(skb,
cb,
NETLBL_NLTYPE_CIPSOV4) < 0)
goto protocols_return;
protos_sent++;
}
#if IS_ENABLED(CONFIG_IPV6)
if (protos_sent == 2) {
if (netlbl_mgmt_protocols_cb(skb,
cb,
NETLBL_NLTYPE_CALIPSO) < 0)
goto protocols_return;
protos_sent++;
}
#endif
protocols_return:
cb->args[0] = protos_sent;
return skb->len;
}
/**
* netlbl_mgmt_version - Handle a VERSION message
* @skb: the NETLINK buffer
* @info: the Generic NETLINK info block
*
* Description:
* Process a user generated VERSION message and respond accordingly. Returns
* zero on success, negative values on failure.
*
*/
static int netlbl_mgmt_version(struct sk_buff *skb, struct genl_info *info)
{
int ret_val = -ENOMEM;
struct sk_buff *ans_skb = NULL;
void *data;
ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
if (ans_skb == NULL)
return -ENOMEM;
data = genlmsg_put_reply(ans_skb, info, &netlbl_mgmt_gnl_family,
0, NLBL_MGMT_C_VERSION);
if (data == NULL)
goto version_failure;
ret_val = nla_put_u32(ans_skb,
NLBL_MGMT_A_VERSION,
NETLBL_PROTO_VERSION);
if (ret_val != 0)
goto version_failure;
genlmsg_end(ans_skb, data);
return genlmsg_reply(ans_skb, info);
version_failure:
kfree_skb(ans_skb);
return ret_val;
}
/*
* NetLabel Generic NETLINK Command Definitions
*/
static const struct genl_small_ops netlbl_mgmt_genl_ops[] = {
{
.cmd = NLBL_MGMT_C_ADD,
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
.flags = GENL_ADMIN_PERM,
.doit = netlbl_mgmt_add,
.dumpit = NULL,
},
{
.cmd = NLBL_MGMT_C_REMOVE,
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
.flags = GENL_ADMIN_PERM,
.doit = netlbl_mgmt_remove,
.dumpit = NULL,
},
{
.cmd = NLBL_MGMT_C_LISTALL,
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
.flags = 0,
.doit = NULL,
.dumpit = netlbl_mgmt_listall,
},
{
.cmd = NLBL_MGMT_C_ADDDEF,
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
.flags = GENL_ADMIN_PERM,
.doit = netlbl_mgmt_adddef,
.dumpit = NULL,
},
{
.cmd = NLBL_MGMT_C_REMOVEDEF,
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
.flags = GENL_ADMIN_PERM,
.doit = netlbl_mgmt_removedef,
.dumpit = NULL,
},
{
.cmd = NLBL_MGMT_C_LISTDEF,
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
.flags = 0,
.doit = netlbl_mgmt_listdef,
.dumpit = NULL,
},
{
.cmd = NLBL_MGMT_C_PROTOCOLS,
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
.flags = 0,
.doit = NULL,
.dumpit = netlbl_mgmt_protocols,
},
{
.cmd = NLBL_MGMT_C_VERSION,
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
.flags = 0,
.doit = netlbl_mgmt_version,
.dumpit = NULL,
},
};
static struct genl_family netlbl_mgmt_gnl_family __ro_after_init = {
.hdrsize = 0,
.name = NETLBL_NLTYPE_MGMT_NAME,
.version = NETLBL_PROTO_VERSION,
.maxattr = NLBL_MGMT_A_MAX,
.policy = netlbl_mgmt_genl_policy,
.module = THIS_MODULE,
.small_ops = netlbl_mgmt_genl_ops,
.n_small_ops = ARRAY_SIZE(netlbl_mgmt_genl_ops),
.resv_start_op = NLBL_MGMT_C_VERSION + 1,
};
/*
* NetLabel Generic NETLINK Protocol Functions
*/
/**
* netlbl_mgmt_genl_init - Register the NetLabel management component
*
* Description:
* Register the NetLabel management component with the Generic NETLINK
* mechanism. Returns zero on success, negative values on failure.
*
*/
int __init netlbl_mgmt_genl_init(void)
{
return genl_register_family(&netlbl_mgmt_gnl_family);
}
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