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   1 From: Pablo Neira Ayuso <pablo@netfilter.org>
   2 Date: Wed, 20 Dec 2017 16:12:55 +0100
   3 Subject: [PATCH] netfilter: remove saveroute indirection in struct nf_afinfo
   4
   5 This is only used by nf_queue.c and this function comes with no symbol
   6 dependencies with IPv6, it just refers to structure layouts. Therefore,
   7 we can replace it by a direct function call from where it belongs.
   8
   9 Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
  10 ---
  11
  12 --- a/include/linux/netfilter.h
  13 +++ b/include/linux/netfilter.h
  14 @@ -313,8 +313,6 @@ struct nf_afinfo {
  15         unsigned short  family;
  16         int             (*route)(struct net *net, struct dst_entry **dst,
  17                                  struct flowi *fl, bool strict);
  18 -       void            (*saveroute)(const struct sk_buff *skb,
  19 -                                    struct nf_queue_entry *entry);
  20         int             (*reroute)(struct net *net, struct sk_buff *skb,
  21                                    const struct nf_queue_entry *entry);
  22         int             route_key_size;
  23 --- a/include/linux/netfilter_ipv4.h
  24 +++ b/include/linux/netfilter_ipv4.h
  25 @@ -6,6 +6,16 @@
  26
  27  #include <uapi/linux/netfilter_ipv4.h>
  28
  29 +/* Extra routing may needed on local out, as the QUEUE target never returns
  30 + * control to the table.
  31 + */
  32 +struct ip_rt_info {
  33 +       __be32 daddr;
  34 +       __be32 saddr;
  35 +       u_int8_t tos;
  36 +       u_int32_t mark;
  37 +};
  38 +
  39  int ip_route_me_harder(struct net *net, struct sk_buff *skb, unsigned addr_type);
  40
  41  #ifdef CONFIG_INET
  42 --- a/include/linux/netfilter_ipv6.h
  43 +++ b/include/linux/netfilter_ipv6.h
  44 @@ -9,6 +9,15 @@
  45
  46  #include <uapi/linux/netfilter_ipv6.h>
  47
  48 +/* Extra routing may needed on local out, as the QUEUE target never returns
  49 + * control to the table.
  50 + */
  51 +struct ip6_rt_info {
  52 +       struct in6_addr daddr;
  53 +       struct in6_addr saddr;
  54 +       u_int32_t mark;
  55 +};
  56 +
  57  /*
  58   * Hook functions for ipv6 to allow xt_* modules to be built-in even
  59   * if IPv6 is a module.
  60 --- a/net/bridge/netfilter/nf_tables_bridge.c
  61 +++ b/net/bridge/netfilter/nf_tables_bridge.c
  62 @@ -95,11 +95,6 @@ static const struct nf_chain_type filter
  63                           (1 << NF_BR_POST_ROUTING),
  64  };
  65
  66 -static void nf_br_saveroute(const struct sk_buff *skb,
  67 -                           struct nf_queue_entry *entry)
  68 -{
  69 -}
  70 -
  71  static int nf_br_reroute(struct net *net, struct sk_buff *skb,
  72                          const struct nf_queue_entry *entry)
  73  {
  74 @@ -115,7 +110,6 @@ static int nf_br_route(struct net *net,
  75  static const struct nf_afinfo nf_br_afinfo = {
  76         .family                 = AF_BRIDGE,
  77         .route                  = nf_br_route,
  78 -       .saveroute              = nf_br_saveroute,
  79         .reroute                = nf_br_reroute,
  80         .route_key_size         = 0,
  81  };
  82 --- a/net/ipv4/netfilter.c
  83 +++ b/net/ipv4/netfilter.c
  84 @@ -80,33 +80,6 @@ int ip_route_me_harder(struct net *net,
  85  }
  86  EXPORT_SYMBOL(ip_route_me_harder);
  87
  88 -/*
  89 - * Extra routing may needed on local out, as the QUEUE target never
  90 - * returns control to the table.
  91 - */
  92 -
  93 -struct ip_rt_info {
  94 -       __be32 daddr;
  95 -       __be32 saddr;
  96 -       u_int8_t tos;
  97 -       u_int32_t mark;
  98 -};
  99 -
 100 -static void nf_ip_saveroute(const struct sk_buff *skb,
 101 -                           struct nf_queue_entry *entry)
 102 -{
 103 -       struct ip_rt_info *rt_info = nf_queue_entry_reroute(entry);
 104 -
 105 -       if (entry->state.hook == NF_INET_LOCAL_OUT) {
 106 -               const struct iphdr *iph = ip_hdr(skb);
 107 -
 108 -               rt_info->tos = iph->tos;
 109 -               rt_info->daddr = iph->daddr;
 110 -               rt_info->saddr = iph->saddr;
 111 -               rt_info->mark = skb->mark;
 112 -       }
 113 -}
 114 -
 115  static int nf_ip_reroute(struct net *net, struct sk_buff *skb,
 116                          const struct nf_queue_entry *entry)
 117  {
 118 @@ -190,7 +163,6 @@ static int nf_ip_route(struct net *net,
 119  static const struct nf_afinfo nf_ip_afinfo = {
 120         .family                 = AF_INET,
 121         .route                  = nf_ip_route,
 122 -       .saveroute              = nf_ip_saveroute,
 123         .reroute                = nf_ip_reroute,
 124         .route_key_size         = sizeof(struct ip_rt_info),
 125  };
 126 --- a/net/ipv6/netfilter.c
 127 +++ b/net/ipv6/netfilter.c
 128 @@ -72,31 +72,6 @@ int ip6_route_me_harder(struct net *net,
 129  }
 130  EXPORT_SYMBOL(ip6_route_me_harder);
 131
 132 -/*
 133 - * Extra routing may needed on local out, as the QUEUE target never
 134 - * returns control to the table.
 135 - */
 136 -
 137 -struct ip6_rt_info {
 138 -       struct in6_addr daddr;
 139 -       struct in6_addr saddr;
 140 -       u_int32_t mark;
 141 -};
 142 -
 143 -static void nf_ip6_saveroute(const struct sk_buff *skb,
 144 -                            struct nf_queue_entry *entry)
 145 -{
 146 -       struct ip6_rt_info *rt_info = nf_queue_entry_reroute(entry);
 147 -
 148 -       if (entry->state.hook == NF_INET_LOCAL_OUT) {
 149 -               const struct ipv6hdr *iph = ipv6_hdr(skb);
 150 -
 151 -               rt_info->daddr = iph->daddr;
 152 -               rt_info->saddr = iph->saddr;
 153 -               rt_info->mark = skb->mark;
 154 -       }
 155 -}
 156 -
 157  static int nf_ip6_reroute(struct net *net, struct sk_buff *skb,
 158                           const struct nf_queue_entry *entry)
 159  {
 160 @@ -204,7 +179,6 @@ static const struct nf_ipv6_ops ipv6ops
 161  static const struct nf_afinfo nf_ip6_afinfo = {
 162         .family                 = AF_INET6,
 163         .route                  = nf_ip6_route,
 164 -       .saveroute              = nf_ip6_saveroute,
 165         .reroute                = nf_ip6_reroute,
 166         .route_key_size         = sizeof(struct ip6_rt_info),
 167  };
 168 --- a/net/netfilter/nf_queue.c
 169 +++ b/net/netfilter/nf_queue.c
 170 @@ -10,6 +10,8 @@
 171  #include <linux/proc_fs.h>
 172  #include <linux/skbuff.h>
 173  #include <linux/netfilter.h>
 174 +#include <linux/netfilter_ipv4.h>
 175 +#include <linux/netfilter_ipv6.h>
 176  #include <linux/netfilter_bridge.h>
 177  #include <linux/seq_file.h>
 178  #include <linux/rcupdate.h>
 179 @@ -108,6 +110,35 @@ void nf_queue_nf_hook_drop(struct net *n
 180  }
 181  EXPORT_SYMBOL_GPL(nf_queue_nf_hook_drop);
 182
 183 +static void nf_ip_saveroute(const struct sk_buff *skb,
 184 +                           struct nf_queue_entry *entry)
 185 +{
 186 +       struct ip_rt_info *rt_info = nf_queue_entry_reroute(entry);
 187 +
 188 +       if (entry->state.hook == NF_INET_LOCAL_OUT) {
 189 +               const struct iphdr *iph = ip_hdr(skb);
 190 +
 191 +               rt_info->tos = iph->tos;
 192 +               rt_info->daddr = iph->daddr;
 193 +               rt_info->saddr = iph->saddr;
 194 +               rt_info->mark = skb->mark;
 195 +       }
 196 +}
 197 +
 198 +static void nf_ip6_saveroute(const struct sk_buff *skb,
 199 +                            struct nf_queue_entry *entry)
 200 +{
 201 +       struct ip6_rt_info *rt_info = nf_queue_entry_reroute(entry);
 202 +
 203 +       if (entry->state.hook == NF_INET_LOCAL_OUT) {
 204 +               const struct ipv6hdr *iph = ipv6_hdr(skb);
 205 +
 206 +               rt_info->daddr = iph->daddr;
 207 +               rt_info->saddr = iph->saddr;
 208 +               rt_info->mark = skb->mark;
 209 +       }
 210 +}
 211 +
 212  static int __nf_queue(struct sk_buff *skb, const struct nf_hook_state *state,
 213                       const struct nf_hook_entries *entries,
 214                       unsigned int index, unsigned int queuenum)
 215 @@ -144,7 +175,16 @@ static int __nf_queue(struct sk_buff *sk
 216
 217         nf_queue_entry_get_refs(entry);
 218         skb_dst_force(skb);
 219 -       afinfo->saveroute(skb, entry);
 220 +
 221 +       switch (entry->state.pf) {
 222 +       case AF_INET:
 223 +               nf_ip_saveroute(skb, entry);
 224 +               break;
 225 +       case AF_INET6:
 226 +               nf_ip6_saveroute(skb, entry);
 227 +               break;
 228 +       }
 229 +
 230         status = qh->outfn(entry, queuenum);
 231
 232         if (status < 0) {