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netfilter: nf_tables: support for adding new devices to an existing netdev chain 

This patch allows users to add devices to an existing netdev chain.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso 2023-04-21 00:34:31 +02:00
parent cdc3254663
commit b9703ed44f
2 changed files with 142 additions and 81 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

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

@ -1609,6 +1609,8 @@ struct nft_trans_chain {
struct nft_stats __percpu *stats;
u8 policy;
u32 chain_id;
struct nft_base_chain *basechain;
struct list_head hook_list;
};
#define nft_trans_chain_update(trans) \
@ -1621,6 +1623,10 @@ struct nft_trans_chain {
(((struct nft_trans_chain *)trans->data)->policy)
#define nft_trans_chain_id(trans) \
(((struct nft_trans_chain *)trans->data)->chain_id)
#define nft_trans_basechain(trans) \
(((struct nft_trans_chain *)trans->data)->basechain)
#define nft_trans_chain_hooks(trans) \
(((struct nft_trans_chain *)trans->data)->hook_list)
struct nft_trans_table {
bool update;

217
net/netfilter/nf_tables_api.c
View File

@ -1582,7 +1582,8 @@ nla_put_failure:
}
static int nft_dump_basechain_hook(struct sk_buff *skb, int family,
const struct nft_base_chain *basechain)
const struct nft_base_chain *basechain,
const struct list_head *hook_list)
{
const struct nf_hook_ops *ops = &basechain->ops;
struct nft_hook *hook, *first = NULL;
@ -1599,7 +1600,11 @@ static int nft_dump_basechain_hook(struct sk_buff *skb, int family,
if (nft_base_chain_netdev(family, ops->hooknum)) {
nest_devs = nla_nest_start_noflag(skb, NFTA_HOOK_DEVS);
list_for_each_entry(hook, &basechain->hook_list, list) {
if (!hook_list)
hook_list = &basechain->hook_list;
list_for_each_entry(hook, hook_list, list) {
if (!first)
first = hook;
@ -1624,7 +1629,8 @@ nla_put_failure:
static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
u32 portid, u32 seq, int event, u32 flags,
int family, const struct nft_table *table,
const struct nft_chain *chain)
const struct nft_chain *chain,
const struct list_head *hook_list)
{
struct nlmsghdr *nlh;
@ -1649,7 +1655,7 @@ static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
const struct nft_base_chain *basechain = nft_base_chain(chain);
struct nft_stats __percpu *stats;
if (nft_dump_basechain_hook(skb, family, basechain))
if (nft_dump_basechain_hook(skb, family, basechain, hook_list))
goto nla_put_failure;
if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
@ -1684,7 +1690,8 @@ nla_put_failure:
return -1;
}
static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event,
const struct list_head *hook_list)
{
struct nftables_pernet *nft_net;
struct sk_buff *skb;
@ -1704,7 +1711,7 @@ static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
event, flags, ctx->family, ctx->table,
ctx->chain);
ctx->chain, hook_list);
if (err < 0) {
kfree_skb(skb);
goto err;
@ -1750,7 +1757,7 @@ static int nf_tables_dump_chains(struct sk_buff *skb,
NFT_MSG_NEWCHAIN,
NLM_F_MULTI,
table->family, table,
chain) < 0)
chain, NULL) < 0)
goto done;
nl_dump_check_consistent(cb, nlmsg_hdr(skb));
@ -1804,7 +1811,7 @@ static int nf_tables_getchain(struct sk_buff *skb, const struct nfnl_info *info,
err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
info->nlh->nlmsg_seq, NFT_MSG_NEWCHAIN,
0, family, table, chain);
0, family, table, chain, NULL);
if (err < 0)
goto err_fill_chain_info;
@ -2048,9 +2055,10 @@ static int nft_chain_parse_netdev(struct net *net,
}
static int nft_chain_parse_hook(struct net *net,
struct nft_base_chain *basechain,
const struct nlattr * const nla[],
struct nft_chain_hook *hook, u8 family,
struct netlink_ext_ack *extack, bool autoload)
struct netlink_ext_ack *extack)
{
struct nftables_pernet *nft_net = nft_pernet(net);
struct nlattr *ha[NFTA_HOOK_MAX + 1];
@ -2066,31 +2074,46 @@ static int nft_chain_parse_hook(struct net *net,
if (err < 0)
return err;
if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
ha[NFTA_HOOK_PRIORITY] == NULL)
return -EINVAL;
if (!basechain) {
if (!ha[NFTA_HOOK_HOOKNUM] ||
!ha[NFTA_HOOK_PRIORITY])
return -EINVAL;
hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
type = __nft_chain_type_get(family, NFT_CHAIN_T_DEFAULT);
if (!type)
return -EOPNOTSUPP;
type = __nft_chain_type_get(family, NFT_CHAIN_T_DEFAULT);
if (!type)
return -EOPNOTSUPP;
if (nla[NFTA_CHAIN_TYPE]) {
type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE],
family, autoload);
if (IS_ERR(type)) {
NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
return PTR_ERR(type);
if (nla[NFTA_CHAIN_TYPE]) {
type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE],
family, true);
if (IS_ERR(type)) {
NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
return PTR_ERR(type);
}
}
}
if (hook->num >= NFT_MAX_HOOKS || !(type->hook_mask & (1 << hook->num)))
return -EOPNOTSUPP;
if (hook->num >= NFT_MAX_HOOKS || !(type->hook_mask & (1 << hook->num)))
return -EOPNOTSUPP;
if (type->type == NFT_CHAIN_T_NAT &&
hook->priority <= NF_IP_PRI_CONNTRACK)
return -EOPNOTSUPP;
if (type->type == NFT_CHAIN_T_NAT &&
hook->priority <= NF_IP_PRI_CONNTRACK)
return -EOPNOTSUPP;
} else {
if (ha[NFTA_HOOK_HOOKNUM]) {
hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
if (hook->num != basechain->ops.hooknum)
return -EOPNOTSUPP;
}
if (ha[NFTA_HOOK_PRIORITY]) {
hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
if (hook->priority != basechain->ops.priority)
return -EOPNOTSUPP;
}
type = basechain->type;
}
if (!try_module_get(type->owner)) {
if (nla[NFTA_CHAIN_TYPE])
@ -2184,12 +2207,8 @@ static int nft_basechain_init(struct nft_base_chain *basechain, u8 family,
list_splice_init(&hook->list, &basechain->hook_list);
list_for_each_entry(h, &basechain->hook_list, list)
nft_basechain_hook_init(&h->ops, family, hook, chain);
basechain->ops.hooknum = hook->num;
basechain->ops.priority = hook->priority;
} else {
nft_basechain_hook_init(&basechain->ops, family, hook, chain);
}
nft_basechain_hook_init(&basechain->ops, family, hook, chain);
chain->flags |= NFT_CHAIN_BASE | flags;
basechain->policy = NF_ACCEPT;
@ -2239,13 +2258,13 @@ static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
if (nla[NFTA_CHAIN_HOOK]) {
struct nft_stats __percpu *stats = NULL;
struct nft_chain_hook hook;
struct nft_chain_hook hook = {};
if (flags & NFT_CHAIN_BINDING)
return -EOPNOTSUPP;
err = nft_chain_parse_hook(net, nla, &hook, family, extack,
true);
err = nft_chain_parse_hook(net, NULL, nla, &hook, family,
extack);
if (err < 0)
return err;
@ -2359,65 +2378,57 @@ err_destroy_chain:
return err;
}
static bool nft_hook_list_equal(struct list_head *hook_list1,
struct list_head *hook_list2)
{
struct nft_hook *hook;
int n = 0, m = 0;
n = 0;
list_for_each_entry(hook, hook_list2, list) {
if (!nft_hook_list_find(hook_list1, hook))
return false;
n++;
}
list_for_each_entry(hook, hook_list1, list)
m++;
return n == m;
}
static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
u32 flags, const struct nlattr *attr,
struct netlink_ext_ack *extack)
{
const struct nlattr * const *nla = ctx->nla;
struct nft_base_chain *basechain = NULL;
struct nft_table *table = ctx->table;
struct nft_chain *chain = ctx->chain;
struct nft_base_chain *basechain;
struct nft_chain_hook hook = {};
struct nft_stats *stats = NULL;
struct nft_chain_hook hook;
struct nft_hook *h, *next;
struct nf_hook_ops *ops;
struct nft_trans *trans;
bool unregister = false;
int err;
if (chain->flags ^ flags)
return -EOPNOTSUPP;
INIT_LIST_HEAD(&hook.list);
if (nla[NFTA_CHAIN_HOOK]) {
if (!nft_is_base_chain(chain)) {
NL_SET_BAD_ATTR(extack, attr);
return -EEXIST;
}
err = nft_chain_parse_hook(ctx->net, nla, &hook, ctx->family,
extack, false);
basechain = nft_base_chain(chain);
err = nft_chain_parse_hook(ctx->net, basechain, nla, &hook,
ctx->family, extack);
if (err < 0)
return err;
basechain = nft_base_chain(chain);
if (basechain->type != hook.type) {
nft_chain_release_hook(&hook);
NL_SET_BAD_ATTR(extack, attr);
return -EEXIST;
}
if (nft_base_chain_netdev(ctx->family, hook.num)) {
if (!nft_hook_list_equal(&basechain->hook_list,
&hook.list)) {
nft_chain_release_hook(&hook);
NL_SET_BAD_ATTR(extack, attr);
return -EEXIST;
if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
list_for_each_entry_safe(h, next, &hook.list, list) {
h->ops.pf = basechain->ops.pf;
h->ops.hooknum = basechain->ops.hooknum;
h->ops.priority = basechain->ops.priority;
h->ops.priv = basechain->ops.priv;
h->ops.hook = basechain->ops.hook;
if (nft_hook_list_find(&basechain->hook_list, h)) {
list_del(&h->list);
kfree(h);
}
}
} else {
ops = &basechain->ops;
@ -2428,7 +2439,6 @@ static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
return -EEXIST;
}
}
nft_chain_release_hook(&hook);
}
if (nla[NFTA_CHAIN_HANDLE] &&
@ -2439,24 +2449,43 @@ static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
nla[NFTA_CHAIN_NAME], genmask);
if (!IS_ERR(chain2)) {
NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
return -EEXIST;
err = -EEXIST;
goto err_hooks;
}
}
if (nla[NFTA_CHAIN_COUNTERS]) {
if (!nft_is_base_chain(chain))
return -EOPNOTSUPP;
if (!nft_is_base_chain(chain)) {
err = -EOPNOTSUPP;
goto err_hooks;
}
stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
if (IS_ERR(stats))
return PTR_ERR(stats);
if (IS_ERR(stats)) {
err = PTR_ERR(stats);
goto err_hooks;
}
}
if (!(table->flags & NFT_TABLE_F_DORMANT) &&
nft_is_base_chain(chain) &&
!list_empty(&hook.list)) {
basechain = nft_base_chain(chain);
ops = &basechain->ops;
if (nft_base_chain_netdev(table->family, basechain->ops.hooknum)) {
err = nft_netdev_register_hooks(ctx->net, &hook.list);
if (err < 0)
goto err_hooks;
}
}
unregister = true;
err = -ENOMEM;
trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
sizeof(struct nft_trans_chain));
if (trans == NULL)
goto err;
goto err_trans;
nft_trans_chain_stats(trans) = stats;
nft_trans_chain_update(trans) = true;
@ -2475,7 +2504,7 @@ static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
err = -ENOMEM;
name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT);
if (!name)
goto err;
goto err_trans;
err = -EEXIST;
list_for_each_entry(tmp, &nft_net->commit_list, list) {
@ -2486,18 +2515,35 @@ static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
strcmp(name, nft_trans_chain_name(tmp)) == 0) {
NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
kfree(name);
goto err;
goto err_trans;
}
}
nft_trans_chain_name(trans) = name;
}
nft_trans_basechain(trans) = basechain;
INIT_LIST_HEAD(&nft_trans_chain_hooks(trans));
list_splice(&hook.list, &nft_trans_chain_hooks(trans));
nft_trans_commit_list_add_tail(ctx->net, trans);
return 0;
err:
err_trans:
free_percpu(stats);
kfree(trans);
err_hooks:
if (nla[NFTA_CHAIN_HOOK]) {
list_for_each_entry_safe(h, next, &hook.list, list) {
if (unregister)
nf_unregister_net_hook(ctx->net, &h->ops);
list_del(&h->list);
kfree_rcu(h, rcu);
}
module_put(hook.type->owner);
}
return err;
}
@ -9244,19 +9290,22 @@ static int nf_tables_commit(struct net *net, struct sk_buff *skb)
case NFT_MSG_NEWCHAIN:
if (nft_trans_chain_update(trans)) {
nft_chain_commit_update(trans);
nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN,
&nft_trans_chain_hooks(trans));
list_splice(&nft_trans_chain_hooks(trans),
&nft_trans_basechain(trans)->hook_list);
/* trans destroyed after rcu grace period */
} else {
nft_chain_commit_drop_policy(trans);
nft_clear(net, trans->ctx.chain);
nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN, NULL);
nft_trans_destroy(trans);
}
break;
case NFT_MSG_DELCHAIN:
case NFT_MSG_DESTROYCHAIN:
nft_chain_del(trans->ctx.chain);
nf_tables_chain_notify(&trans->ctx, trans->msg_type);
nf_tables_chain_notify(&trans->ctx, trans->msg_type, NULL);
nf_tables_unregister_hook(trans->ctx.net,
trans->ctx.table,
trans->ctx.chain);
@ -9423,7 +9472,10 @@ static void nf_tables_abort_release(struct nft_trans *trans)
nf_tables_table_destroy(&trans->ctx);
break;
case NFT_MSG_NEWCHAIN:
nf_tables_chain_destroy(&trans->ctx);
if (nft_trans_chain_update(trans))
nft_hooks_destroy(&nft_trans_chain_hooks(trans));
else
nf_tables_chain_destroy(&trans->ctx);
break;
case NFT_MSG_NEWRULE:
nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
@ -9486,6 +9538,9 @@ static int __nf_tables_abort(struct net *net, enum nfnl_abort_action action)
break;
case NFT_MSG_NEWCHAIN:
if (nft_trans_chain_update(trans)) {
nft_netdev_unregister_hooks(net,
&nft_trans_chain_hooks(trans),
true);
free_percpu(nft_trans_chain_stats(trans));
kfree(nft_trans_chain_name(trans));
nft_trans_destroy(trans);