From 33a24de37e814572491bcb35f42c0de74ad67586 Mon Sep 17 00:00:00 2001 From: Pablo Neira Ayuso Date: Sun, 9 Jan 2022 17:11:14 +0100 Subject: netfilter: nft_last: move stateful fields out of expression data In preparation for the rule blob representation. Signed-off-by: Pablo Neira Ayuso --- net/netfilter/nft_last.c | 69 +++++++++++++++++++++++++++++++++++------------- 1 file changed, 51 insertions(+), 18 deletions(-) (limited to 'net/netfilter') diff --git a/net/netfilter/nft_last.c b/net/netfilter/nft_last.c index 304e33cbed9b..5ee33d0ccd4e 100644 --- a/net/netfilter/nft_last.c +++ b/net/netfilter/nft_last.c @@ -8,9 +8,13 @@ #include #include +struct nft_last { + unsigned long jiffies; + unsigned int set; +}; + struct nft_last_priv { - unsigned long last_jiffies; - unsigned int last_set; + struct nft_last *last; }; static const struct nla_policy nft_last_policy[NFTA_LAST_MAX + 1] = { @@ -22,47 +26,55 @@ static int nft_last_init(const struct nft_ctx *ctx, const struct nft_expr *expr, const struct nlattr * const tb[]) { struct nft_last_priv *priv = nft_expr_priv(expr); + struct nft_last *last; u64 last_jiffies; - u32 last_set = 0; int err; - if (tb[NFTA_LAST_SET]) { - last_set = ntohl(nla_get_be32(tb[NFTA_LAST_SET])); - if (last_set == 1) - priv->last_set = 1; - } + last = kzalloc(sizeof(*last), GFP_KERNEL); + if (!last) + return -ENOMEM; + + if (tb[NFTA_LAST_SET]) + last->set = ntohl(nla_get_be32(tb[NFTA_LAST_SET])); - if (last_set && tb[NFTA_LAST_MSECS]) { + if (last->set && tb[NFTA_LAST_MSECS]) { err = nf_msecs_to_jiffies64(tb[NFTA_LAST_MSECS], &last_jiffies); if (err < 0) - return err; + goto err; - priv->last_jiffies = jiffies - (unsigned long)last_jiffies; + last->jiffies = jiffies - (unsigned long)last_jiffies; } + priv->last = last; return 0; +err: + kfree(last); + + return err; } static void nft_last_eval(const struct nft_expr *expr, struct nft_regs *regs, const struct nft_pktinfo *pkt) { struct nft_last_priv *priv = nft_expr_priv(expr); + struct nft_last *last = priv->last; - if (READ_ONCE(priv->last_jiffies) != jiffies) - WRITE_ONCE(priv->last_jiffies, jiffies); - if (READ_ONCE(priv->last_set) == 0) - WRITE_ONCE(priv->last_set, 1); + if (READ_ONCE(last->jiffies) != jiffies) + WRITE_ONCE(last->jiffies, jiffies); + if (READ_ONCE(last->set) == 0) + WRITE_ONCE(last->set, 1); } static int nft_last_dump(struct sk_buff *skb, const struct nft_expr *expr) { struct nft_last_priv *priv = nft_expr_priv(expr); - unsigned long last_jiffies = READ_ONCE(priv->last_jiffies); - u32 last_set = READ_ONCE(priv->last_set); + struct nft_last *last = priv->last; + unsigned long last_jiffies = READ_ONCE(last->jiffies); + u32 last_set = READ_ONCE(last->set); __be64 msecs; if (time_before(jiffies, last_jiffies)) { - WRITE_ONCE(priv->last_set, 0); + WRITE_ONCE(last->set, 0); last_set = 0; } @@ -81,11 +93,32 @@ nla_put_failure: return -1; } +static void nft_last_destroy(const struct nft_ctx *ctx, + const struct nft_expr *expr) +{ + struct nft_last_priv *priv = nft_expr_priv(expr); + + kfree(priv->last); +} + +static int nft_last_clone(struct nft_expr *dst, const struct nft_expr *src) +{ + struct nft_last_priv *priv_dst = nft_expr_priv(dst); + + priv_dst->last = kzalloc(sizeof(*priv_dst->last), GFP_ATOMIC); + if (priv_dst->last) + return -ENOMEM; + + return 0; +} + static const struct nft_expr_ops nft_last_ops = { .type = &nft_last_type, .size = NFT_EXPR_SIZE(sizeof(struct nft_last_priv)), .eval = nft_last_eval, .init = nft_last_init, + .destroy = nft_last_destroy, + .clone = nft_last_clone, .dump = nft_last_dump, }; -- cgit v1.2.3-59-g8ed1b