target/linux/generic/backport-4.19/295-v4.16-netfilter-don-t-allocate-space-for-decnet-hooks-unle.patch

   1 From bb4badf3a3dc81190f7c1c1fa063cdefb18df45f Mon Sep 17 00:00:00 2001
   2 From: Florian Westphal <fw@strlen.de>
   3 Date: Thu, 7 Dec 2017 16:28:25 +0100
   4 Subject: [PATCH 07/11] netfilter: don't allocate space for decnet hooks unless
   5  needed
   6
   7 no need to define hook points if the family isn't supported.
   8
   9 Signed-off-by: Florian Westphal <fw@strlen.de>
  10 Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
  11 ---
  12  include/linux/netfilter.h     | 2 ++
  13  include/net/netns/netfilter.h | 2 ++
  14  net/netfilter/core.c          | 4 ++++
  15  3 files changed, 8 insertions(+)
  16
  17 --- a/include/linux/netfilter.h
  18 +++ b/include/linux/netfilter.h
  19 @@ -219,9 +219,11 @@ static inline int nf_hook(u_int8_t pf, u
  20         case NFPROTO_BRIDGE:
  21                 hook_head = rcu_dereference(net->nf.hooks_bridge[hook]);
  22                 break;
  23 +#if IS_ENABLED(CONFIG_DECNET)
  24         case NFPROTO_DECNET:
  25                 hook_head = rcu_dereference(net->nf.hooks_decnet[hook]);
  26                 break;
  27 +#endif
  28         default:
  29                 WARN_ON_ONCE(1);
  30                 break;
  31 --- a/include/net/netns/netfilter.h
  32 +++ b/include/net/netns/netfilter.h
  33 @@ -21,7 +21,9 @@ struct netns_nf {
  34         struct nf_hook_entries __rcu *hooks_ipv6[NF_INET_NUMHOOKS];
  35         struct nf_hook_entries __rcu *hooks_arp[NF_ARP_NUMHOOKS];
  36         struct nf_hook_entries __rcu *hooks_bridge[NF_INET_NUMHOOKS];
  37 +#if IS_ENABLED(CONFIG_DECNET)
  38         struct nf_hook_entries __rcu *hooks_decnet[NF_DN_NUMHOOKS];
  39 +#endif
  40  #if IS_ENABLED(CONFIG_NF_DEFRAG_IPV4)
  41         bool                    defrag_ipv4;
  42  #endif
  43 --- a/net/netfilter/core.c
  44 +++ b/net/netfilter/core.c
  45 @@ -283,10 +283,12 @@ static struct nf_hook_entries __rcu **nf
  46                 if (WARN_ON_ONCE(ARRAY_SIZE(net->nf.hooks_ipv6) <= reg->hooknum))
  47                         return NULL;
  48                 return net->nf.hooks_ipv6 + reg->hooknum;
  49 +#if IS_ENABLED(CONFIG_DECNET)
  50         case NFPROTO_DECNET:
  51                 if (WARN_ON_ONCE(ARRAY_SIZE(net->nf.hooks_decnet) <= reg->hooknum))
  52                         return NULL;
  53                 return net->nf.hooks_decnet + reg->hooknum;
  54 +#endif
  55         default:
  56                 WARN_ON_ONCE(1);
  57                 return NULL;
  58 @@ -573,7 +575,9 @@ static int __net_init netfilter_net_init
  59         __netfilter_net_init(net->nf.hooks_ipv6, ARRAY_SIZE(net->nf.hooks_ipv6));
  60         __netfilter_net_init(net->nf.hooks_arp, ARRAY_SIZE(net->nf.hooks_arp));
  61         __netfilter_net_init(net->nf.hooks_bridge, ARRAY_SIZE(net->nf.hooks_bridge));
  62 +#if IS_ENABLED(CONFIG_DECNET)
  63         __netfilter_net_init(net->nf.hooks_decnet, ARRAY_SIZE(net->nf.hooks_decnet));
  64 +#endif
  65
  66  #ifdef CONFIG_PROC_FS
  67         net->nf.proc_netfilter = proc_net_mkdir(net, "netfilter",