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   1 From: Pablo Neira Ayuso <pablo@netfilter.org>
   2 Date: Tue, 19 Dec 2017 13:53:45 +0100
   3 Subject: [PATCH] netfilter: nf_tables: remove nhooks field from struct
   4  nft_af_info
   5
   6 We already validate the hook through bitmask, so this check is
   7 superfluous. When removing this, this patch is also fixing a bug in the
   8 new flowtable codebase, since ctx->afi points to the table family
   9 instead of the netdev family which is where the flowtable is really
  10 hooked in.
  11
  12 Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
  13 ---
  14
  15 --- a/include/net/netfilter/nf_tables.h
  16 +++ b/include/net/netfilter/nf_tables.h
  17 @@ -968,7 +968,6 @@ enum nft_af_flags {
  18   *
  19   *     @list: used internally
  20   *     @family: address family
  21 - *     @nhooks: number of hooks in this family
  22   *     @owner: module owner
  23   *     @tables: used internally
  24   *     @flags: family flags
  25 @@ -976,7 +975,6 @@ enum nft_af_flags {
  26  struct nft_af_info {
  27         struct list_head                list;
  28         int                             family;
  29 -       unsigned int                    nhooks;
  30         struct module                   *owner;
  31         struct list_head                tables;
  32         u32                             flags;
  33 --- a/net/bridge/netfilter/nf_tables_bridge.c
  34 +++ b/net/bridge/netfilter/nf_tables_bridge.c
  35 @@ -44,7 +44,6 @@ nft_do_chain_bridge(void *priv,
  36
  37  static struct nft_af_info nft_af_bridge __read_mostly = {
  38         .family         = NFPROTO_BRIDGE,
  39 -       .nhooks         = NF_BR_NUMHOOKS,
  40         .owner          = THIS_MODULE,
  41  };
  42
  43 --- a/net/ipv4/netfilter/nf_tables_arp.c
  44 +++ b/net/ipv4/netfilter/nf_tables_arp.c
  45 @@ -29,7 +29,6 @@ nft_do_chain_arp(void *priv,
  46
  47  static struct nft_af_info nft_af_arp __read_mostly = {
  48         .family         = NFPROTO_ARP,
  49 -       .nhooks         = NF_ARP_NUMHOOKS,
  50         .owner          = THIS_MODULE,
  51  };
  52
  53 --- a/net/ipv4/netfilter/nf_tables_ipv4.c
  54 +++ b/net/ipv4/netfilter/nf_tables_ipv4.c
  55 @@ -32,7 +32,6 @@ static unsigned int nft_do_chain_ipv4(vo
  56
  57  static struct nft_af_info nft_af_ipv4 __read_mostly = {
  58         .family         = NFPROTO_IPV4,
  59 -       .nhooks         = NF_INET_NUMHOOKS,
  60         .owner          = THIS_MODULE,
  61  };
  62
  63 --- a/net/ipv6/netfilter/nf_tables_ipv6.c
  64 +++ b/net/ipv6/netfilter/nf_tables_ipv6.c
  65 @@ -30,7 +30,6 @@ static unsigned int nft_do_chain_ipv6(vo
  66
  67  static struct nft_af_info nft_af_ipv6 __read_mostly = {
  68         .family         = NFPROTO_IPV6,
  69 -       .nhooks         = NF_INET_NUMHOOKS,
  70         .owner          = THIS_MODULE,
  71  };
  72
  73 --- a/net/netfilter/nf_tables_api.c
  74 +++ b/net/netfilter/nf_tables_api.c
  75 @@ -1359,9 +1359,6 @@ static int nft_chain_parse_hook(struct n
  76                 return -EINVAL;
  77
  78         hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
  79 -       if (hook->num >= afi->nhooks)
  80 -               return -EINVAL;
  81 -
  82         hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
  83
  84         type = chain_type[afi->family][NFT_CHAIN_T_DEFAULT];
  85 @@ -4986,7 +4983,7 @@ static int nf_tables_flowtable_parse_hoo
  86                 return -EINVAL;
  87
  88         hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
  89 -       if (hooknum >= ctx->afi->nhooks)
  90 +       if (hooknum != NF_NETDEV_INGRESS)
  91                 return -EINVAL;
  92
  93         priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
  94 --- a/net/netfilter/nf_tables_inet.c
  95 +++ b/net/netfilter/nf_tables_inet.c
  96 @@ -40,7 +40,6 @@ static unsigned int nft_do_chain_inet(vo
  97
  98  static struct nft_af_info nft_af_inet __read_mostly = {
  99         .family         = NFPROTO_INET,
 100 -       .nhooks         = NF_INET_NUMHOOKS,
 101         .owner          = THIS_MODULE,
 102  };
 103
 104 --- a/net/netfilter/nf_tables_netdev.c
 105 +++ b/net/netfilter/nf_tables_netdev.c
 106 @@ -40,7 +40,6 @@ nft_do_chain_netdev(void *priv, struct s
 107
 108  static struct nft_af_info nft_af_netdev __read_mostly = {
 109         .family         = NFPROTO_NETDEV,
 110 -       .nhooks         = NF_NETDEV_NUMHOOKS,
 111         .owner          = THIS_MODULE,
 112         .flags          = NFT_AF_NEEDS_DEV,
 113  };