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Message-Id: <20200529175026.30541-7-pablo@netfilter.org>
Date: Fri, 29 May 2020 19:50:23 +0200
From: Pablo Neira Ayuso <pablo@...filter.org>
To: netfilter-devel@...r.kernel.org
Cc: davem@...emloft.net, netdev@...r.kernel.org, kuba@...nel.org
Subject: [PATCH 6/9] netfilter: nf_tables: add devices to existing flowtable
This patch allows users to add devices to an existing flowtable.
Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
---
include/net/netfilter/nf_tables.h | 6 ++
net/netfilter/nf_tables_api.c | 97 +++++++++++++++++++++++++++----
2 files changed, 92 insertions(+), 11 deletions(-)
diff --git a/include/net/netfilter/nf_tables.h b/include/net/netfilter/nf_tables.h
index d4e29c952c40..4f58c4411bb4 100644
--- a/include/net/netfilter/nf_tables.h
+++ b/include/net/netfilter/nf_tables.h
@@ -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);
diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index 4db70e68d7f4..98f2cbb97e39 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -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++;
--
2.20.1
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