This patch generalises the existing rule transaction infrastructure
so it can be used to handle set, table and chain object transactions
as well. The transaction provides a data area that stores private
information depending on the transaction type.
Signed-off-by: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
---
include/net/netfilter/nf_tables.h | 15 +++--
net/netfilter/nf_tables_api.c | 123 +++++++++++++++++++++----------------
2 files changed, 80 insertions(+), 58 deletions(-)
diff --git a/include/net/netfilter/nf_tables.h b/include/net/netfilter/nf_tables.h
index 9150523..246dbd4 100644
--- a/include/net/netfilter/nf_tables.h
+++ b/include/net/netfilter/nf_tables.h
@@ -387,18 +387,25 @@ struct nft_rule {
};
/**
- * struct nft_rule_trans - nf_tables rule update in transaction
+ * struct nft_trans - nf_tables object update in transaction
*
* @list: used internally
- * @ctx: rule context
- * @rule: rule that needs to be updated
+ * @ctx: transaction context
+ * @data: internal information related to the transaction
*/
-struct nft_rule_trans {
+struct nft_trans {
struct list_head list;
struct nft_ctx ctx;
+ char data[0];
+};
+
+struct nft_trans_rule {
struct nft_rule *rule;
};
+#define nft_trans_rule(trans) \
+ (((struct nft_trans_rule *)trans->data)->rule)
+
static inline struct nft_expr *nft_expr_first(const struct nft_rule *rule)
{
return (struct nft_expr *)&rule->data[0];
diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index 3643bbc..424a6f3 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -105,6 +105,25 @@ static void nft_ctx_init(struct nft_ctx *ctx,
ctx->nla = nla;
}
+static struct nft_trans *nft_trans_alloc(struct nft_ctx *ctx, u32 size)
+{
+ struct nft_trans *trans;
+
+ trans = kzalloc(sizeof(struct nft_trans) + size, GFP_KERNEL);
+ if (trans == NULL)
+ return NULL;
+
+ trans->ctx = *ctx;
+
+ return trans;
+}
+
+static void nft_trans_destroy(struct nft_trans *trans)
+{
+ list_del(&trans->list);
+ kfree(trans);
+}
+
/*
* Tables
*/
@@ -1557,26 +1576,25 @@ static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
kfree(rule);
}
-#define NFT_RULE_MAXEXPRS 128
-
-static struct nft_expr_info *info;
-
-static struct nft_rule_trans *
-nf_tables_trans_add(struct nft_ctx *ctx, struct nft_rule *rule)
+static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx,
+ struct nft_rule *rule)
{
- struct nft_rule_trans *rupd;
+ struct nft_trans *trans;
- rupd = kmalloc(sizeof(struct nft_rule_trans), GFP_KERNEL);
- if (rupd == NULL)
- return NULL;
+ trans = nft_trans_alloc(ctx, sizeof(struct nft_trans_rule));
+ if (trans == NULL)
+ return NULL;
- rupd->ctx = *ctx;
- rupd->rule = rule;
- list_add_tail(&rupd->list, &ctx->net->nft.commit_list);
+ nft_trans_rule(trans) = rule;
+ list_add_tail(&trans->list, &ctx->net->nft.commit_list);
- return rupd;
+ return trans;
}
+#define NFT_RULE_MAXEXPRS 128
+
+static struct nft_expr_info *info;
+
static int nf_tables_newrule(struct sock *nlsk, struct sk_buff *skb,
const struct nlmsghdr *nlh,
const struct nlattr * const nla[])
@@ -1587,7 +1605,7 @@ static int nf_tables_newrule(struct sock *nlsk, struct sk_buff *skb,
struct nft_table *table;
struct nft_chain *chain;
struct nft_rule *rule, *old_rule = NULL;
- struct nft_rule_trans *repl = NULL;
+ struct nft_trans *trans = NULL;
struct nft_expr *expr;
struct nft_ctx ctx;
struct nlattr *tmp;
@@ -1685,8 +1703,8 @@ static int nf_tables_newrule(struct sock *nlsk, struct sk_buff *skb,
if (nlh->nlmsg_flags & NLM_F_REPLACE) {
if (nft_rule_is_active_next(net, old_rule)) {
- repl = nf_tables_trans_add(&ctx, old_rule);
- if (repl == NULL) {
+ trans = nft_trans_rule_add(&ctx, old_rule);
+ if (trans == NULL) {
err = -ENOMEM;
goto err2;
}
@@ -1708,7 +1726,7 @@ static int nf_tables_newrule(struct sock *nlsk, struct sk_buff *skb,
list_add_rcu(&rule->list, &chain->rules);
}
- if (nf_tables_trans_add(&ctx, rule) == NULL) {
+ if (nft_trans_rule_add(&ctx, rule) == NULL) {
err = -ENOMEM;
goto err3;
}
@@ -1716,11 +1734,10 @@ static int nf_tables_newrule(struct sock *nlsk, struct sk_buff *skb,
err3:
list_del_rcu(&rule->list);
- if (repl) {
- list_del_rcu(&repl->rule->list);
- list_del(&repl->list);
- nft_rule_clear(net, repl->rule);
- kfree(repl);
+ if (trans) {
+ list_del_rcu(&nft_trans_rule(trans)->list);
+ nft_rule_clear(net, nft_trans_rule(trans));
+ nft_trans_destroy(trans);
}
err2:
nf_tables_rule_destroy(&ctx, rule);
@@ -1737,7 +1754,7 @@ nf_tables_delrule_one(struct nft_ctx *ctx, struct nft_rule *rule)
{
/* You cannot delete the same rule twice */
if (nft_rule_is_active_next(ctx->net, rule)) {
- if (nf_tables_trans_add(ctx, rule) == NULL)
+ if (nft_trans_rule_add(ctx, rule) == NULL)
return -ENOMEM;
nft_rule_disactivate_next(ctx->net, rule);
return 0;
@@ -1813,7 +1830,7 @@ static int nf_tables_delrule(struct sock *nlsk, struct sk_buff *skb,
static int nf_tables_commit(struct sk_buff *skb)
{
struct net *net = sock_net(skb->sk);
- struct nft_rule_trans *rupd, *tmp;
+ struct nft_trans *trans, *next;
/* Bump generation counter, invalidate any dump in progress */
net->nft.genctr++;
@@ -1826,38 +1843,38 @@ static int nf_tables_commit(struct sk_buff *skb)
*/
synchronize_rcu();
- list_for_each_entry_safe(rupd, tmp, &net->nft.commit_list, list) {
+ list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
/* This rule was inactive in the past and just became active.
* Clear the next bit of the genmask since its meaning has
* changed, now it is the future.
*/
- if (nft_rule_is_active(net, rupd->rule)) {
- nft_rule_clear(net, rupd->rule);
- nf_tables_rule_notify(skb, rupd->ctx.nlh,
- rupd->ctx.table, rupd->ctx.chain,
- rupd->rule, NFT_MSG_NEWRULE, 0,
- rupd->ctx.afi->family);
- list_del(&rupd->list);
- kfree(rupd);
+ if (nft_rule_is_active(net, nft_trans_rule(trans))) {
+ nft_rule_clear(net, nft_trans_rule(trans));
+ nf_tables_rule_notify(skb, trans->ctx.nlh,
+ trans->ctx.table,
+ trans->ctx.chain,
+ nft_trans_rule(trans),
+ NFT_MSG_NEWRULE, 0,
+ trans->ctx.afi->family);
+ nft_trans_destroy(trans);
continue;
}
/* This rule is in the past, get rid of it */
- list_del_rcu(&rupd->rule->list);
- nf_tables_rule_notify(skb, rupd->ctx.nlh,
- rupd->ctx.table, rupd->ctx.chain,
- rupd->rule, NFT_MSG_DELRULE, 0,
- rupd->ctx.afi->family);
+ list_del_rcu(&nft_trans_rule(trans)->list);
+ nf_tables_rule_notify(skb, trans->ctx.nlh,
+ trans->ctx.table, trans->ctx.chain,
+ nft_trans_rule(trans), NFT_MSG_DELRULE,
+ 0, trans->ctx.afi->family);
}
/* Make sure we don't see any packet traversing old rules */
synchronize_rcu();
/* Now we can safely release unused old rules */
- list_for_each_entry_safe(rupd, tmp, &net->nft.commit_list, list) {
- nf_tables_rule_destroy(&rupd->ctx, rupd->rule);
- list_del(&rupd->list);
- kfree(rupd);
+ list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
+ nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
+ nft_trans_destroy(trans);
}
return 0;
@@ -1866,27 +1883,25 @@ static int nf_tables_commit(struct sk_buff *skb)
static int nf_tables_abort(struct sk_buff *skb)
{
struct net *net = sock_net(skb->sk);
- struct nft_rule_trans *rupd, *tmp;
+ struct nft_trans *trans, *next;
- list_for_each_entry_safe(rupd, tmp, &net->nft.commit_list, list) {
- if (!nft_rule_is_active_next(net, rupd->rule)) {
- nft_rule_clear(net, rupd->rule);
- list_del(&rupd->list);
- kfree(rupd);
+ list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
+ if (!nft_rule_is_active_next(net, nft_trans_rule(trans))) {
+ nft_rule_clear(net, nft_trans_rule(trans));
+ nft_trans_destroy(trans);
continue;
}
/* This rule is inactive, get rid of it */
- list_del_rcu(&rupd->rule->list);
+ list_del_rcu(&nft_trans_rule(trans)->list);
}
/* Make sure we don't see any packet accessing aborted rules */
synchronize_rcu();
- list_for_each_entry_safe(rupd, tmp, &net->nft.commit_list, list) {
- nf_tables_rule_destroy(&rupd->ctx, rupd->rule);
- list_del(&rupd->list);
- kfree(rupd);
+ list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
+ nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
+ nft_trans_destroy(trans);
}
return 0;
--
1.7.10.4
--
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