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netfilter: nf_tables: add devices to existing flowtable

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This patch allows users to add devices to an existing flowtable.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso 2020-05-20 13:46:47 +02:00
parent c42d8bda69
commit 78d9f48f7f
2 changed files with 92 additions and 11 deletions
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6
include/net/netfilter/nf_tables.h
View File

@ -1481,10 +1481,16 @@ struct nft_trans_obj {
struct nft_trans_flowtable {
struct nft_flowtable *flowtable;
bool update;
struct list_head hook_list;
};
#define nft_trans_flowtable(trans) \
(((struct nft_trans_flowtable *)trans->data)->flowtable)
#define nft_trans_flowtable_update(trans) \
(((struct nft_trans_flowtable *)trans->data)->update)
#define nft_trans_flowtable_hooks(trans) \
(((struct nft_trans_flowtable *)trans->data)->hook_list)
int __init nft_chain_filter_init(void);
void nft_chain_filter_fini(void);

97
net/netfilter/nf_tables_api.c
View File

@ -6349,6 +6349,62 @@ static void nft_flowtable_hooks_destroy(struct list_head *hook_list)
}
}
static int nft_flowtable_update(struct nft_ctx *ctx, const struct nlmsghdr *nlh,
struct nft_flowtable *flowtable)
{
const struct nlattr * const *nla = ctx->nla;
struct nft_flowtable_hook flowtable_hook;
struct nft_hook *hook, *next;
struct nft_trans *trans;
bool unregister = false;
int err;
err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
&flowtable_hook, &flowtable->data);
if (err < 0)
return err;
list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
if (nft_hook_list_find(&flowtable->hook_list, hook)) {
list_del(&hook->list);
kfree(hook);
}
}
err = nft_register_flowtable_net_hooks(ctx->net, ctx->table,
&flowtable_hook.list, flowtable);
if (err < 0)
goto err_flowtable_update_hook;
trans = nft_trans_alloc(ctx, NFT_MSG_NEWFLOWTABLE,
sizeof(struct nft_trans_flowtable));
if (!trans) {
unregister = true;
err = -ENOMEM;
goto err_flowtable_update_hook;
}
nft_trans_flowtable(trans) = flowtable;
nft_trans_flowtable_update(trans) = true;
INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
list_splice(&flowtable_hook.list, &nft_trans_flowtable_hooks(trans));
list_add_tail(&trans->list, &ctx->net->nft.commit_list);
return 0;
err_flowtable_update_hook:
list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
if (unregister)
nft_unregister_flowtable_hook(ctx->net, flowtable, hook);
list_del_rcu(&hook->list);
kfree_rcu(hook, rcu);
}
return err;
}
static int nf_tables_newflowtable(struct net *net, struct sock *nlsk,
struct sk_buff *skb,
const struct nlmsghdr *nlh,
@ -6392,7 +6448,9 @@ static int nf_tables_newflowtable(struct net *net, struct sock *nlsk,
return -EEXIST;
}
return 0;
nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
return nft_flowtable_update(&ctx, nlh, flowtable);
}
nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
@ -7495,11 +7553,20 @@ static int nf_tables_commit(struct net *net, struct sk_buff *skb)
NFT_MSG_DELOBJ);
break;
case NFT_MSG_NEWFLOWTABLE:
nft_clear(net, nft_trans_flowtable(trans));
nf_tables_flowtable_notify(&trans->ctx,
nft_trans_flowtable(trans),
&nft_trans_flowtable(trans)->hook_list,
NFT_MSG_NEWFLOWTABLE);
if (nft_trans_flowtable_update(trans)) {
nf_tables_flowtable_notify(&trans->ctx,
nft_trans_flowtable(trans),
&nft_trans_flowtable_hooks(trans),
NFT_MSG_NEWFLOWTABLE);
list_splice(&nft_trans_flowtable_hooks(trans),
&nft_trans_flowtable(trans)->hook_list);
} else {
nft_clear(net, nft_trans_flowtable(trans));
nf_tables_flowtable_notify(&trans->ctx,
nft_trans_flowtable(trans),
&nft_trans_flowtable(trans)->hook_list,
NFT_MSG_NEWFLOWTABLE);
}
nft_trans_destroy(trans);
break;
case NFT_MSG_DELFLOWTABLE:
@ -7558,7 +7625,10 @@ static void nf_tables_abort_release(struct nft_trans *trans)
nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
break;
case NFT_MSG_NEWFLOWTABLE:
nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
if (nft_trans_flowtable_update(trans))
nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
else
nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
break;
}
kfree(trans);
@ -7665,10 +7735,15 @@ static int __nf_tables_abort(struct net *net, bool autoload)
nft_trans_destroy(trans);
break;
case NFT_MSG_NEWFLOWTABLE:
trans->ctx.table->use--;
list_del_rcu(&nft_trans_flowtable(trans)->list);
nft_unregister_flowtable_net_hooks(net,
&nft_trans_flowtable(trans)->hook_list);
if (nft_trans_flowtable_update(trans)) {
nft_unregister_flowtable_net_hooks(net,
&nft_trans_flowtable_hooks(trans));
} else {
trans->ctx.table->use--;
list_del_rcu(&nft_trans_flowtable(trans)->list);
nft_unregister_flowtable_net_hooks(net,
&nft_trans_flowtable(trans)->hook_list);
}
break;
case NFT_MSG_DELFLOWTABLE:
trans->ctx.table->use++;