target/linux/generic/backport-5.10/610-v5.13-10-netfilter-nftables-update-table-flags-from-the-commi.patch

   1 From: Pablo Neira Ayuso <pablo@netfilter.org>
   2 Date: Tue, 23 Mar 2021 00:56:28 +0100
   3 Subject: [PATCH] netfilter: nftables: update table flags from the commit
   4  phase
   5
   6 Do not update table flags from the preparation phase. Store the flags
   7 update into the transaction, then update the flags from the commit
   8 phase.
   9
  10 Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
  11 ---
  12
  13 --- a/include/net/netfilter/nf_tables.h
  14 +++ b/include/net/netfilter/nf_tables.h
  15 @@ -1470,13 +1470,16 @@ struct nft_trans_chain {
  16
  17  struct nft_trans_table {
  18         bool                            update;
  19 -       bool                            enable;
  20 +       u8                              state;
  21 +       u32                             flags;
  22  };
  23
  24  #define nft_trans_table_update(trans)  \
  25         (((struct nft_trans_table *)trans->data)->update)
  26 -#define nft_trans_table_enable(trans)  \
  27 -       (((struct nft_trans_table *)trans->data)->enable)
  28 +#define nft_trans_table_state(trans)   \
  29 +       (((struct nft_trans_table *)trans->data)->state)
  30 +#define nft_trans_table_flags(trans)   \
  31 +       (((struct nft_trans_table *)trans->data)->flags)
  32
  33  struct nft_trans_elem {
  34         struct nft_set                  *set;
  35 --- a/net/netfilter/nf_tables_api.c
  36 +++ b/net/netfilter/nf_tables_api.c
  37 @@ -891,6 +891,12 @@ static void nf_tables_table_disable(stru
  38         nft_table_disable(net, table, 0);
  39  }
  40
  41 +enum {
  42 +       NFT_TABLE_STATE_UNCHANGED       = 0,
  43 +       NFT_TABLE_STATE_DORMANT,
  44 +       NFT_TABLE_STATE_WAKEUP
  45 +};
  46 +
  47  static int nf_tables_updtable(struct nft_ctx *ctx)
  48  {
  49         struct nft_trans *trans;
  50 @@ -914,19 +920,17 @@ static int nf_tables_updtable(struct nft
  51
  52         if ((flags & NFT_TABLE_F_DORMANT) &&
  53             !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
  54 -               nft_trans_table_enable(trans) = false;
  55 +               nft_trans_table_state(trans) = NFT_TABLE_STATE_DORMANT;
  56         } else if (!(flags & NFT_TABLE_F_DORMANT) &&
  57                    ctx->table->flags & NFT_TABLE_F_DORMANT) {
  58 -               ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
  59                 ret = nf_tables_table_enable(ctx->net, ctx->table);
  60                 if (ret >= 0)
  61 -                       nft_trans_table_enable(trans) = true;
  62 -               else
  63 -                       ctx->table->flags |= NFT_TABLE_F_DORMANT;
  64 +                       nft_trans_table_state(trans) = NFT_TABLE_STATE_WAKEUP;
  65         }
  66         if (ret < 0)
  67                 goto err;
  68
  69 +       nft_trans_table_flags(trans) = flags;
  70         nft_trans_table_update(trans) = true;
  71         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
  72         return 0;
  73 @@ -7878,11 +7882,10 @@ static int nf_tables_commit(struct net *
  74                 switch (trans->msg_type) {
  75                 case NFT_MSG_NEWTABLE:
  76                         if (nft_trans_table_update(trans)) {
  77 -                               if (!nft_trans_table_enable(trans)) {
  78 -                                       nf_tables_table_disable(net,
  79 -                                                               trans->ctx.table);
  80 -                                       trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
  81 -                               }
  82 +                               if (nft_trans_table_state(trans) == NFT_TABLE_STATE_DORMANT)
  83 +                                       nf_tables_table_disable(net, trans->ctx.table);
  84 +
  85 +                               trans->ctx.table->flags = nft_trans_table_flags(trans);
  86                         } else {
  87                                 nft_clear(net, trans->ctx.table);
  88                         }
  89 @@ -8095,11 +8098,9 @@ static int __nf_tables_abort(struct net
  90                 switch (trans->msg_type) {
  91                 case NFT_MSG_NEWTABLE:
  92                         if (nft_trans_table_update(trans)) {
  93 -                               if (nft_trans_table_enable(trans)) {
  94 -                                       nf_tables_table_disable(net,
  95 -                                                               trans->ctx.table);
  96 -                                       trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
  97 -                               }
  98 +                               if (nft_trans_table_state(trans) == NFT_TABLE_STATE_WAKEUP)
  99 +                                       nf_tables_table_disable(net, trans->ctx.table);
 100 +
 101                                 nft_trans_destroy(trans);
 102                         } else {
 103                                 list_del_rcu(&trans->ctx.table->list);