linux/net/netlabel/netlabel_mgmt.c
Jakub Kicinski 9c5d03d362 genetlink: start to validate reserved header bytes
We had historically not checked that genlmsghdr.reserved
is 0 on input which prevents us from using those precious
bytes in the future.

One use case would be to extend the cmd field, which is
currently just 8 bits wide and 256 is not a lot of commands
for some core families.

To make sure that new families do the right thing by default
put the onus of opting out of validation on existing families.

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Acked-by: Paul Moore <paul@paul-moore.com> (NetLabel)
Signed-off-by: David S. Miller <davem@davemloft.net>
2022-08-29 12:47:15 +01:00

848 lines
22 KiB
C

// 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:
if (info->attrs[NLBL_MGMT_A_FAMILY])
entry->family =
nla_get_u16(info->attrs[NLBL_MGMT_A_FAMILY]);
else
entry->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;
if (info->attrs[NLBL_MGMT_A_FAMILY])
family = nla_get_u16(info->attrs[NLBL_MGMT_A_FAMILY]);
else
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);
}