From fca05d4d61e65fa573a3768f9019a42143c03349 Mon Sep 17 00:00:00 2001 From: Pablo Neira Ayuso Date: Sat, 16 Jan 2021 12:26:46 +0100 Subject: [PATCH 1/3] netfilter: nft_dynset: honor stateful expressions in set definition If the set definition contains stateful expressions, allocate them for the newly added entries from the packet path. Fixes: 65038428b2c6 ("netfilter: nf_tables: allow to specify stateful expression in set definition") Signed-off-by: Pablo Neira Ayuso --- include/net/netfilter/nf_tables.h | 2 ++ net/netfilter/nf_tables_api.c | 5 ++--- net/netfilter/nft_dynset.c | 6 ++++++ 3 files changed, 10 insertions(+), 3 deletions(-) diff --git a/include/net/netfilter/nf_tables.h b/include/net/netfilter/nf_tables.h index f4af8362d234..4b6ecf532623 100644 --- a/include/net/netfilter/nf_tables.h +++ b/include/net/netfilter/nf_tables.h @@ -721,6 +721,8 @@ void *nft_set_elem_init(const struct nft_set *set, const struct nft_set_ext_tmpl *tmpl, const u32 *key, const u32 *key_end, const u32 *data, u64 timeout, u64 expiration, gfp_t gfp); +int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set, + struct nft_expr *expr_array[]); void nft_set_elem_destroy(const struct nft_set *set, void *elem, bool destroy_expr); diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c index 15c467f1a9dd..8d3aa97b52e7 100644 --- a/net/netfilter/nf_tables_api.c +++ b/net/netfilter/nf_tables_api.c @@ -5235,9 +5235,8 @@ static void nf_tables_set_elem_destroy(const struct nft_ctx *ctx, kfree(elem); } -static int nft_set_elem_expr_clone(const struct nft_ctx *ctx, - struct nft_set *set, - struct nft_expr *expr_array[]) +int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set, + struct nft_expr *expr_array[]) { struct nft_expr *expr; int err, i, k; diff --git a/net/netfilter/nft_dynset.c b/net/netfilter/nft_dynset.c index 0b053f75cd60..86204740f6c7 100644 --- a/net/netfilter/nft_dynset.c +++ b/net/netfilter/nft_dynset.c @@ -295,6 +295,12 @@ static int nft_dynset_init(const struct nft_ctx *ctx, err = -EOPNOTSUPP; goto err_expr_free; } + } else if (set->num_exprs > 0) { + err = nft_set_elem_expr_clone(ctx, set, priv->expr_array); + if (err < 0) + return err; + + priv->num_exprs = set->num_exprs; } nft_set_ext_prepare(&priv->tmpl); From 0c5b7a501e7400869ee905b4f7af3d6717802bcb Mon Sep 17 00:00:00 2001 From: Pablo Neira Ayuso Date: Sat, 16 Jan 2021 19:20:15 +0100 Subject: [PATCH 2/3] netfilter: nft_dynset: add timeout extension to template Otherwise, the newly create element shows no timeout when listing the ruleset. If the set definition does not specify a default timeout, then the set element only shows the expiration time, but not the timeout. This is a problem when restoring a stateful ruleset listing since it skips the timeout policy entirely. Fixes: 22fe54d5fefc ("netfilter: nf_tables: add support for dynamic set updates") Signed-off-by: Pablo Neira Ayuso --- net/netfilter/nft_dynset.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/net/netfilter/nft_dynset.c b/net/netfilter/nft_dynset.c index 86204740f6c7..218c09e4fddd 100644 --- a/net/netfilter/nft_dynset.c +++ b/net/netfilter/nft_dynset.c @@ -312,8 +312,10 @@ static int nft_dynset_init(const struct nft_ctx *ctx, nft_dynset_ext_add_expr(priv); if (set->flags & NFT_SET_TIMEOUT) { - if (timeout || set->timeout) + if (timeout || set->timeout) { + nft_set_ext_add(&priv->tmpl, NFT_SET_EXT_TIMEOUT); nft_set_ext_add(&priv->tmpl, NFT_SET_EXT_EXPIRATION); + } } priv->timeout = timeout; From ce5379963b2884e9d23bea0c5674a7251414c84b Mon Sep 17 00:00:00 2001 From: Pablo Neira Ayuso Date: Sat, 16 Jan 2021 19:50:34 +0100 Subject: [PATCH 3/3] netfilter: nft_dynset: dump expressions when set definition contains no expressions If the set definition provides no stateful expressions, then include the stateful expression in the ruleset listing. Without this fix, the dynset rule listing shows the stateful expressions provided by the set definition. Fixes: 65038428b2c6 ("netfilter: nf_tables: allow to specify stateful expression in set definition") Signed-off-by: Pablo Neira Ayuso --- net/netfilter/nft_dynset.c | 31 +++++++++++++++++-------------- 1 file changed, 17 insertions(+), 14 deletions(-) diff --git a/net/netfilter/nft_dynset.c b/net/netfilter/nft_dynset.c index 218c09e4fddd..d164ef9e6843 100644 --- a/net/netfilter/nft_dynset.c +++ b/net/netfilter/nft_dynset.c @@ -384,22 +384,25 @@ static int nft_dynset_dump(struct sk_buff *skb, const struct nft_expr *expr) nf_jiffies64_to_msecs(priv->timeout), NFTA_DYNSET_PAD)) goto nla_put_failure; - if (priv->num_exprs == 1) { - if (nft_expr_dump(skb, NFTA_DYNSET_EXPR, priv->expr_array[0])) - goto nla_put_failure; - } else if (priv->num_exprs > 1) { - struct nlattr *nest; - - nest = nla_nest_start_noflag(skb, NFTA_DYNSET_EXPRESSIONS); - if (!nest) - goto nla_put_failure; - - for (i = 0; i < priv->num_exprs; i++) { - if (nft_expr_dump(skb, NFTA_LIST_ELEM, - priv->expr_array[i])) + if (priv->set->num_exprs == 0) { + if (priv->num_exprs == 1) { + if (nft_expr_dump(skb, NFTA_DYNSET_EXPR, + priv->expr_array[0])) goto nla_put_failure; + } else if (priv->num_exprs > 1) { + struct nlattr *nest; + + nest = nla_nest_start_noflag(skb, NFTA_DYNSET_EXPRESSIONS); + if (!nest) + goto nla_put_failure; + + for (i = 0; i < priv->num_exprs; i++) { + if (nft_expr_dump(skb, NFTA_LIST_ELEM, + priv->expr_array[i])) + goto nla_put_failure; + } + nla_nest_end(skb, nest); } - nla_nest_end(skb, nest); } if (nla_put_be32(skb, NFTA_DYNSET_FLAGS, htonl(flags))) goto nla_put_failure;