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Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf-next 

Pablo Neira Ayuso says:

====================
Netfilter updates for net-next

The following patchset contains Netfilter updates for net-next:

1) Add two helper functions to release one table and hooks from
   the netns and netlink event path.

2) Add table ownership infrastructure, this new infrastructure allows
   users to bind a table (and its content) to a process through the
   netlink socket.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2021-02-17 13:19:24 -08:00
parent 96313e1db8 6001a930ce
commit 32511f8e49
3 changed files with 176 additions and 84 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
include/net/netfilter/nf_tables.h
View File

@ -1106,11 +1106,17 @@ struct nft_table {
u16 family:6,
flags:8,
genmask:2;
u32 nlpid;
char *name;
u16 udlen;
u8 *udata;
};
static inline bool nft_table_has_owner(const struct nft_table *table)
{
return table->flags & NFT_TABLE_F_OWNER;
}
static inline bool nft_base_chain_netdev(int family, u32 hooknum)
{
return family == NFPROTO_NETDEV ||

5
include/uapi/linux/netfilter/nf_tables.h
View File

@ -164,7 +164,10 @@ enum nft_hook_attributes {
*/
enum nft_table_flags {
NFT_TABLE_F_DORMANT = 0x1,
NFT_TABLE_F_OWNER = 0x2,
};
#define NFT_TABLE_F_MASK (NFT_TABLE_F_DORMANT | \
NFT_TABLE_F_OWNER)
/**
* enum nft_table_attributes - nf_tables table netlink attributes
@ -173,6 +176,7 @@ enum nft_table_flags {
* @NFTA_TABLE_FLAGS: bitmask of enum nft_table_flags (NLA_U32)
* @NFTA_TABLE_USE: number of chains in this table (NLA_U32)
* @NFTA_TABLE_USERDATA: user data (NLA_BINARY)
* @NFTA_TABLE_OWNER: owner of this table through netlink portID (NLA_U32)
*/
enum nft_table_attributes {
NFTA_TABLE_UNSPEC,
@ -182,6 +186,7 @@ enum nft_table_attributes {
NFTA_TABLE_HANDLE,
NFTA_TABLE_PAD,
NFTA_TABLE_USERDATA,
NFTA_TABLE_OWNER,
__NFTA_TABLE_MAX
};
#define NFTA_TABLE_MAX (__NFTA_TABLE_MAX - 1)

249
net/netfilter/nf_tables_api.c
View File

@ -508,7 +508,7 @@ static int nft_delflowtable(struct nft_ctx *ctx,
static struct nft_table *nft_table_lookup(const struct net *net,
const struct nlattr *nla,
u8 family, u8 genmask)
u8 family, u8 genmask, u32 nlpid)
{
struct nft_table *table;
@ -519,8 +519,13 @@ static struct nft_table *nft_table_lookup(const struct net *net,
lockdep_is_held(&net->nft.commit_mutex)) {
if (!nla_strcmp(nla, table->name) &&
table->family == family &&
nft_active_genmask(table, genmask))
nft_active_genmask(table, genmask)) {
if (nft_table_has_owner(table) &&
table->nlpid != nlpid)
return ERR_PTR(-EPERM);
return table;
}
}
return ERR_PTR(-ENOENT);
@ -679,6 +684,9 @@ static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle),
NFTA_TABLE_PAD))
goto nla_put_failure;
if (nft_table_has_owner(table) &&
nla_put_be32(skb, NFTA_TABLE_OWNER, htonl(table->nlpid)))
goto nla_put_failure;
if (table->udata) {
if (nla_put(skb, NFTA_TABLE_USERDATA, table->udlen, table->udata))
@ -821,7 +829,7 @@ static int nf_tables_gettable(struct net *net, struct sock *nlsk,
return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
}
table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask);
table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask, 0);
if (IS_ERR(table)) {
NL_SET_BAD_ATTR(extack, nla[NFTA_TABLE_NAME]);
return PTR_ERR(table);
@ -902,8 +910,8 @@ static int nf_tables_updtable(struct nft_ctx *ctx)
return 0;
flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
if (flags & ~NFT_TABLE_F_DORMANT)
return -EINVAL;
if (flags & ~NFT_TABLE_F_MASK)
return -EOPNOTSUPP;
if (flags == ctx->table->flags)
return 0;
@ -1003,7 +1011,8 @@ static int nf_tables_newtable(struct net *net, struct sock *nlsk,
lockdep_assert_held(&net->nft.commit_mutex);
attr = nla[NFTA_TABLE_NAME];
table = nft_table_lookup(net, attr, family, genmask);
table = nft_table_lookup(net, attr, family, genmask,
NETLINK_CB(skb).portid);
if (IS_ERR(table)) {
if (PTR_ERR(table) != -ENOENT)
return PTR_ERR(table);
@ -1021,8 +1030,8 @@ static int nf_tables_newtable(struct net *net, struct sock *nlsk,
if (nla[NFTA_TABLE_FLAGS]) {
flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
if (flags & ~NFT_TABLE_F_DORMANT)
return -EINVAL;
if (flags & ~NFT_TABLE_F_MASK)
return -EOPNOTSUPP;
}
err = -ENOMEM;
@ -1053,6 +1062,8 @@ static int nf_tables_newtable(struct net *net, struct sock *nlsk,
table->family = family;
table->flags = flags;
table->handle = ++table_handle;
if (table->flags & NFT_TABLE_F_OWNER)
table->nlpid = NETLINK_CB(skb).portid;
nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
@ -1160,6 +1171,9 @@ static int nft_flush(struct nft_ctx *ctx, int family)
if (!nft_is_active_next(ctx->net, table))
continue;
if (nft_table_has_owner(table) && table->nlpid != ctx->portid)
continue;
if (nla[NFTA_TABLE_NAME] &&
nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
continue;
@ -1196,7 +1210,8 @@ static int nf_tables_deltable(struct net *net, struct sock *nlsk,
table = nft_table_lookup_byhandle(net, attr, genmask);
} else {
attr = nla[NFTA_TABLE_NAME];
table = nft_table_lookup(net, attr, family, genmask);
table = nft_table_lookup(net, attr, family, genmask,
NETLINK_CB(skb).portid);
}
if (IS_ERR(table)) {
@ -1579,7 +1594,7 @@ static int nf_tables_getchain(struct net *net, struct sock *nlsk,
return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
}
table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask, 0);
if (IS_ERR(table)) {
NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
return PTR_ERR(table);
@ -2299,7 +2314,8 @@ static int nf_tables_newchain(struct net *net, struct sock *nlsk,
lockdep_assert_held(&net->nft.commit_mutex);
table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
NETLINK_CB(skb).portid);
if (IS_ERR(table)) {
NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
return PTR_ERR(table);
@ -2395,7 +2411,8 @@ static int nf_tables_delchain(struct net *net, struct sock *nlsk,
u32 use;
int err;
table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
NETLINK_CB(skb).portid);
if (IS_ERR(table)) {
NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
return PTR_ERR(table);
@ -3041,7 +3058,7 @@ static int nf_tables_getrule(struct net *net, struct sock *nlsk,
return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
}
table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask, 0);
if (IS_ERR(table)) {
NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
return PTR_ERR(table);
@ -3179,7 +3196,8 @@ static int nf_tables_newrule(struct net *net, struct sock *nlsk,
lockdep_assert_held(&net->nft.commit_mutex);
table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
NETLINK_CB(skb).portid);
if (IS_ERR(table)) {
NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
return PTR_ERR(table);
@ -3403,7 +3421,8 @@ static int nf_tables_delrule(struct net *net, struct sock *nlsk,
int family = nfmsg->nfgen_family, err = 0;
struct nft_ctx ctx;
table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
NETLINK_CB(skb).portid);
if (IS_ERR(table)) {
NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
return PTR_ERR(table);
@ -3584,7 +3603,7 @@ static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, struct net *net,
const struct nlmsghdr *nlh,
const struct nlattr * const nla[],
struct netlink_ext_ack *extack,
u8 genmask)
u8 genmask, u32 nlpid)
{
const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
int family = nfmsg->nfgen_family;
@ -3592,7 +3611,7 @@ static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, struct net *net,
if (nla[NFTA_SET_TABLE] != NULL) {
table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
genmask);
genmask, nlpid);
if (IS_ERR(table)) {
NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
return PTR_ERR(table);
@ -4007,7 +4026,7 @@ static int nf_tables_getset(struct net *net, struct sock *nlsk,
/* Verify existence before starting dump */
err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, extack,
genmask);
genmask, 0);
if (err < 0)
return err;
@ -4236,7 +4255,8 @@ static int nf_tables_newset(struct net *net, struct sock *nlsk,
if (nla[NFTA_SET_EXPR] || nla[NFTA_SET_EXPRESSIONS])
desc.expr = true;
table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask);
table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask,
NETLINK_CB(skb).portid);
if (IS_ERR(table)) {
NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
return PTR_ERR(table);
@ -4413,7 +4433,7 @@ static int nf_tables_delset(struct net *net, struct sock *nlsk,
return -EINVAL;
err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, extack,
genmask);
genmask, NETLINK_CB(skb).portid);
if (err < 0)
return err;
@ -4608,14 +4628,14 @@ static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx, struct net *net,
const struct nlmsghdr *nlh,
const struct nlattr * const nla[],
struct netlink_ext_ack *extack,
u8 genmask)
u8 genmask, u32 nlpid)
{
const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
int family = nfmsg->nfgen_family;
struct nft_table *table;
table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
genmask);
genmask, nlpid);
if (IS_ERR(table)) {
NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
return PTR_ERR(table);
@ -5032,7 +5052,7 @@ static int nf_tables_getsetelem(struct net *net, struct sock *nlsk,
int rem, err = 0;
err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
genmask);
genmask, NETLINK_CB(skb).portid);
if (err < 0)
return err;
@ -5613,7 +5633,7 @@ static int nf_tables_newsetelem(struct net *net, struct sock *nlsk,
return -EINVAL;
err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
genmask);
genmask, NETLINK_CB(skb).portid);
if (err < 0)
return err;
@ -5821,7 +5841,7 @@ static int nf_tables_delsetelem(struct net *net, struct sock *nlsk,
int rem, err = 0;
err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
genmask);
genmask, NETLINK_CB(skb).portid);
if (err < 0)
return err;
@ -6124,7 +6144,8 @@ static int nf_tables_newobj(struct net *net, struct sock *nlsk,
!nla[NFTA_OBJ_DATA])
return -EINVAL;
table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
NETLINK_CB(skb).portid);
if (IS_ERR(table)) {
NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
return PTR_ERR(table);
@ -6394,7 +6415,7 @@ static int nf_tables_getobj(struct net *net, struct sock *nlsk,
!nla[NFTA_OBJ_TYPE])
return -EINVAL;
table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask, 0);
if (IS_ERR(table)) {
NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
return PTR_ERR(table);
@ -6468,7 +6489,8 @@ static int nf_tables_delobj(struct net *net, struct sock *nlsk,
(!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
return -EINVAL;
table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
NETLINK_CB(skb).portid);
if (IS_ERR(table)) {
NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
return PTR_ERR(table);
@ -6885,7 +6907,7 @@ static int nf_tables_newflowtable(struct net *net, struct sock *nlsk,
return -EINVAL;
table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
genmask);
genmask, NETLINK_CB(skb).portid);
if (IS_ERR(table)) {
NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
return PTR_ERR(table);
@ -7069,7 +7091,7 @@ static int nf_tables_delflowtable(struct net *net, struct sock *nlsk,
return -EINVAL;
table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
genmask);
genmask, NETLINK_CB(skb).portid);
if (IS_ERR(table)) {
NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
return PTR_ERR(table);
@ -7277,7 +7299,7 @@ static int nf_tables_getflowtable(struct net *net, struct sock *nlsk,
return -EINVAL;
table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
genmask);
genmask, 0);
if (IS_ERR(table))
return PTR_ERR(table);
@ -8988,21 +9010,25 @@ int __nft_release_basechain(struct nft_ctx *ctx)
}
EXPORT_SYMBOL_GPL(__nft_release_basechain);
static void __nft_release_hook(struct net *net, struct nft_table *table)
{
struct nft_chain *chain;
list_for_each_entry(chain, &table->chains, list)
nf_tables_unregister_hook(net, table, chain);
}
static void __nft_release_hooks(struct net *net)
{
struct nft_table *table;
struct nft_chain *chain;
list_for_each_entry(table, &net->nft.tables, list) {
list_for_each_entry(chain, &table->chains, list)
nf_tables_unregister_hook(net, table, chain);
}
list_for_each_entry(table, &net->nft.tables, list)
__nft_release_hook(net, table);
}
static void __nft_release_tables(struct net *net)
static void __nft_release_table(struct net *net, struct nft_table *table)
{
struct nft_flowtable *flowtable, *nf;
struct nft_table *table, *nt;
struct nft_chain *chain, *nc;
struct nft_object *obj, *ne;
struct nft_rule *rule, *nr;
@ -9012,43 +9038,90 @@ static void __nft_release_tables(struct net *net)
.family = NFPROTO_NETDEV,
};
ctx.family = table->family;
ctx.table = table;
list_for_each_entry(chain, &table->chains, list) {
ctx.chain = chain;
list_for_each_entry_safe(rule, nr, &chain->rules, list) {
list_del(&rule->list);
chain->use--;
nf_tables_rule_release(&ctx, rule);
}
}
list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
list_del(&flowtable->list);
table->use--;
nf_tables_flowtable_destroy(flowtable);
}
list_for_each_entry_safe(set, ns, &table->sets, list) {
list_del(&set->list);
table->use--;
nft_set_destroy(&ctx, set);
}
list_for_each_entry_safe(obj, ne, &table->objects, list) {
nft_obj_del(obj);
table->use--;
nft_obj_destroy(&ctx, obj);
}
list_for_each_entry_safe(chain, nc, &table->chains, list) {
ctx.chain = chain;
nft_chain_del(chain);
table->use--;
nf_tables_chain_destroy(&ctx);
}
list_del(&table->list);
nf_tables_table_destroy(&ctx);
}
static void __nft_release_tables(struct net *net, u32 nlpid)
{
struct nft_table *table, *nt;
list_for_each_entry_safe(table, nt, &net->nft.tables, list) {
ctx.family = table->family;
ctx.table = table;
list_for_each_entry(chain, &table->chains, list) {
ctx.chain = chain;
list_for_each_entry_safe(rule, nr, &chain->rules, list) {
list_del(&rule->list);
chain->use--;
nf_tables_rule_release(&ctx, rule);
}
}
list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
list_del(&flowtable->list);
table->use--;
nf_tables_flowtable_destroy(flowtable);
}
list_for_each_entry_safe(set, ns, &table->sets, list) {
list_del(&set->list);
table->use--;
nft_set_destroy(&ctx, set);
}
list_for_each_entry_safe(obj, ne, &table->objects, list) {
nft_obj_del(obj);
table->use--;
nft_obj_destroy(&ctx, obj);
}
list_for_each_entry_safe(chain, nc, &table->chains, list) {
ctx.chain = chain;
nft_chain_del(chain);
table->use--;
nf_tables_chain_destroy(&ctx);
}
list_del(&table->list);
nf_tables_table_destroy(&ctx);
if (nft_table_has_owner(table) &&
nlpid != table->nlpid)
continue;
__nft_release_table(net, table);
}
}
static int nft_rcv_nl_event(struct notifier_block *this, unsigned long event,
void *ptr)
{
struct netlink_notify *n = ptr;
struct nft_table *table, *nt;
struct net *net = n->net;
bool release = false;
if (event != NETLINK_URELEASE || n->protocol != NETLINK_NETFILTER)
return NOTIFY_DONE;
mutex_lock(&net->nft.commit_mutex);
list_for_each_entry(table, &net->nft.tables, list) {
if (nft_table_has_owner(table) &&
n->portid == table->nlpid) {
__nft_release_hook(net, table);
release = true;
}
}
if (release) {
synchronize_rcu();
list_for_each_entry_safe(table, nt, &net->nft.tables, list) {
if (nft_table_has_owner(table) &&
n->portid == table->nlpid)
__nft_release_table(net, table);
}
}
mutex_unlock(&net->nft.commit_mutex);
return NOTIFY_DONE;
}
static struct notifier_block nft_nl_notifier = {
.notifier_call = nft_rcv_nl_event,
};
static int __net_init nf_tables_init_net(struct net *net)
{
INIT_LIST_HEAD(&net->nft.tables);
@ -9072,7 +9145,7 @@ static void __net_exit nf_tables_exit_net(struct net *net)
mutex_lock(&net->nft.commit_mutex);
if (!list_empty(&net->nft.commit_list))
__nf_tables_abort(net, NFNL_ABORT_NONE);
__nft_release_tables(net);
__nft_release_tables(net, 0);
mutex_unlock(&net->nft.commit_mutex);
WARN_ON_ONCE(!list_empty(&net->nft.tables));
WARN_ON_ONCE(!list_empty(&net->nft.module_list));
@ -9096,43 +9169,50 @@ static int __init nf_tables_module_init(void)
err = nft_chain_filter_init();
if (err < 0)
goto err1;
goto err_chain_filter;
err = nf_tables_core_module_init();
if (err < 0)
goto err2;
goto err_core_module;
err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
if (err < 0)
goto err3;
goto err_netdev_notifier;
err = rhltable_init(&nft_objname_ht, &nft_objname_ht_params);
if (err < 0)
goto err4;
goto err_rht_objname;
err = nft_offload_init();
if (err < 0)
goto err5;
goto err_offload;
err = netlink_register_notifier(&nft_nl_notifier);
if (err < 0)
goto err_netlink_notifier;
/* must be last */
err = nfnetlink_subsys_register(&nf_tables_subsys);
if (err < 0)
goto err6;
goto err_nfnl_subsys;
nft_chain_route_init();
return err;
err6:
err_nfnl_subsys:
netlink_unregister_notifier(&nft_nl_notifier);
err_netlink_notifier:
nft_offload_exit();
err5:
err_offload:
rhltable_destroy(&nft_objname_ht);
err4:
err_rht_objname:
unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
err3:
err_netdev_notifier:
nf_tables_core_module_exit();
err2:
err_core_module:
nft_chain_filter_fini();
err1:
err_chain_filter:
unregister_pernet_subsys(&nf_tables_net_ops);
return err;
}
@ -9140,6 +9220,7 @@ static int __init nf_tables_module_init(void)
static void __exit nf_tables_module_exit(void)
{
nfnetlink_subsys_unregister(&nf_tables_subsys);
netlink_unregister_notifier(&nft_nl_notifier);
nft_offload_exit();
unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
nft_chain_filter_fini();