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   1 From: Felix Fietkau <nbd@nbd.name>
   2 Date: Sun, 18 Feb 2018 18:16:31 +0100
   3 Subject: [PATCH] netfilter: nf_flow_table: move init code to
   4  nf_flow_table_core.c
   5
   6 Reduces duplication of .gc and .params in flowtable type definitions and
   7 makes the API clearer
   8
   9 Signed-off-by: Felix Fietkau <nbd@nbd.name>
  10 ---
  11
  12 --- a/include/net/netfilter/nf_flow_table.h
  13 +++ b/include/net/netfilter/nf_flow_table.h
  14 @@ -14,9 +14,8 @@ struct nf_flowtable;
  15  struct nf_flowtable_type {
  16         struct list_head                list;
  17         int                             family;
  18 -       void                            (*gc)(struct work_struct *work);
  19 +       int                             (*init)(struct nf_flowtable *ft);
  20         void                            (*free)(struct nf_flowtable *ft);
  21 -       const struct rhashtable_params  *params;
  22         nf_hookfn                       *hook;
  23         struct module                   *owner;
  24  };
  25 @@ -100,9 +99,8 @@ int nf_flow_table_iterate(struct nf_flow
  26
  27  void nf_flow_table_cleanup(struct net *net, struct net_device *dev);
  28
  29 +int nf_flow_table_init(struct nf_flowtable *flow_table);
  30  void nf_flow_table_free(struct nf_flowtable *flow_table);
  31 -void nf_flow_offload_work_gc(struct work_struct *work);
  32 -extern const struct rhashtable_params nf_flow_offload_rhash_params;
  33
  34  void flow_offload_dead(struct flow_offload *flow);
  35
  36 --- a/net/ipv4/netfilter/nf_flow_table_ipv4.c
  37 +++ b/net/ipv4/netfilter/nf_flow_table_ipv4.c
  38 @@ -7,8 +7,7 @@
  39
  40  static struct nf_flowtable_type flowtable_ipv4 = {
  41         .family         = NFPROTO_IPV4,
  42 -       .params         = &nf_flow_offload_rhash_params,
  43 -       .gc             = nf_flow_offload_work_gc,
  44 +       .init           = nf_flow_table_init,
  45         .free           = nf_flow_table_free,
  46         .hook           = nf_flow_offload_ip_hook,
  47         .owner          = THIS_MODULE,
  48 --- a/net/ipv6/netfilter/nf_flow_table_ipv6.c
  49 +++ b/net/ipv6/netfilter/nf_flow_table_ipv6.c
  50 @@ -8,8 +8,7 @@
  51
  52  static struct nf_flowtable_type flowtable_ipv6 = {
  53         .family         = NFPROTO_IPV6,
  54 -       .params         = &nf_flow_offload_rhash_params,
  55 -       .gc             = nf_flow_offload_work_gc,
  56 +       .init           = nf_flow_table_init,
  57         .free           = nf_flow_table_free,
  58         .hook           = nf_flow_offload_ipv6_hook,
  59         .owner          = THIS_MODULE,
  60 --- a/net/netfilter/nf_flow_table_core.c
  61 +++ b/net/netfilter/nf_flow_table_core.c
  62 @@ -116,16 +116,50 @@ void flow_offload_dead(struct flow_offlo
  63  }
  64  EXPORT_SYMBOL_GPL(flow_offload_dead);
  65
  66 +static u32 flow_offload_hash(const void *data, u32 len, u32 seed)
  67 +{
  68 +       const struct flow_offload_tuple *tuple = data;
  69 +
  70 +       return jhash(tuple, offsetof(struct flow_offload_tuple, dir), seed);
  71 +}
  72 +
  73 +static u32 flow_offload_hash_obj(const void *data, u32 len, u32 seed)
  74 +{
  75 +       const struct flow_offload_tuple_rhash *tuplehash = data;
  76 +
  77 +       return jhash(&tuplehash->tuple, offsetof(struct flow_offload_tuple, dir), seed);
  78 +}
  79 +
  80 +static int flow_offload_hash_cmp(struct rhashtable_compare_arg *arg,
  81 +                                       const void *ptr)
  82 +{
  83 +       const struct flow_offload_tuple *tuple = arg->key;
  84 +       const struct flow_offload_tuple_rhash *x = ptr;
  85 +
  86 +       if (memcmp(&x->tuple, tuple, offsetof(struct flow_offload_tuple, dir)))
  87 +               return 1;
  88 +
  89 +       return 0;
  90 +}
  91 +
  92 +static const struct rhashtable_params nf_flow_offload_rhash_params = {
  93 +       .head_offset            = offsetof(struct flow_offload_tuple_rhash, node),
  94 +       .hashfn                 = flow_offload_hash,
  95 +       .obj_hashfn             = flow_offload_hash_obj,
  96 +       .obj_cmpfn              = flow_offload_hash_cmp,
  97 +       .automatic_shrinking    = true,
  98 +};
  99 +
 100  int flow_offload_add(struct nf_flowtable *flow_table, struct flow_offload *flow)
 101  {
 102         flow->timeout = (u32)jiffies;
 103
 104         rhashtable_insert_fast(&flow_table->rhashtable,
 105                                &flow->tuplehash[FLOW_OFFLOAD_DIR_ORIGINAL].node,
 106 -                              *flow_table->type->params);
 107 +                              nf_flow_offload_rhash_params);
 108         rhashtable_insert_fast(&flow_table->rhashtable,
 109                                &flow->tuplehash[FLOW_OFFLOAD_DIR_REPLY].node,
 110 -                              *flow_table->type->params);
 111 +                              nf_flow_offload_rhash_params);
 112         return 0;
 113  }
 114  EXPORT_SYMBOL_GPL(flow_offload_add);
 115 @@ -135,10 +169,10 @@ static void flow_offload_del(struct nf_f
 116  {
 117         rhashtable_remove_fast(&flow_table->rhashtable,
 118                                &flow->tuplehash[FLOW_OFFLOAD_DIR_ORIGINAL].node,
 119 -                              *flow_table->type->params);
 120 +                              nf_flow_offload_rhash_params);
 121         rhashtable_remove_fast(&flow_table->rhashtable,
 122                                &flow->tuplehash[FLOW_OFFLOAD_DIR_REPLY].node,
 123 -                              *flow_table->type->params);
 124 +                              nf_flow_offload_rhash_params);
 125
 126         flow_offload_free(flow);
 127  }
 128 @@ -148,7 +182,7 @@ flow_offload_lookup(struct nf_flowtable
 129                     struct flow_offload_tuple *tuple)
 130  {
 131         return rhashtable_lookup_fast(&flow_table->rhashtable, tuple,
 132 -                                     *flow_table->type->params);
 133 +                                     nf_flow_offload_rhash_params);
 134  }
 135  EXPORT_SYMBOL_GPL(flow_offload_lookup);
 136
 137 @@ -237,7 +271,7 @@ out:
 138         return 1;
 139  }
 140
 141 -void nf_flow_offload_work_gc(struct work_struct *work)
 142 +static void nf_flow_offload_work_gc(struct work_struct *work)
 143  {
 144         struct nf_flowtable *flow_table;
 145
 146 @@ -245,42 +279,6 @@ void nf_flow_offload_work_gc(struct work
 147         nf_flow_offload_gc_step(flow_table);
 148         queue_delayed_work(system_power_efficient_wq, &flow_table->gc_work, HZ);
 149  }
 150 -EXPORT_SYMBOL_GPL(nf_flow_offload_work_gc);
 151 -
 152 -static u32 flow_offload_hash(const void *data, u32 len, u32 seed)
 153 -{
 154 -       const struct flow_offload_tuple *tuple = data;
 155 -
 156 -       return jhash(tuple, offsetof(struct flow_offload_tuple, dir), seed);
 157 -}
 158 -
 159 -static u32 flow_offload_hash_obj(const void *data, u32 len, u32 seed)
 160 -{
 161 -       const struct flow_offload_tuple_rhash *tuplehash = data;
 162 -
 163 -       return jhash(&tuplehash->tuple, offsetof(struct flow_offload_tuple, dir), seed);
 164 -}
 165 -
 166 -static int flow_offload_hash_cmp(struct rhashtable_compare_arg *arg,
 167 -                                       const void *ptr)
 168 -{
 169 -       const struct flow_offload_tuple *tuple = arg->key;
 170 -       const struct flow_offload_tuple_rhash *x = ptr;
 171 -
 172 -       if (memcmp(&x->tuple, tuple, offsetof(struct flow_offload_tuple, dir)))
 173 -               return 1;
 174 -
 175 -       return 0;
 176 -}
 177 -
 178 -const struct rhashtable_params nf_flow_offload_rhash_params = {
 179 -       .head_offset            = offsetof(struct flow_offload_tuple_rhash, node),
 180 -       .hashfn                 = flow_offload_hash,
 181 -       .obj_hashfn             = flow_offload_hash_obj,
 182 -       .obj_cmpfn              = flow_offload_hash_cmp,
 183 -       .automatic_shrinking    = true,
 184 -};
 185 -EXPORT_SYMBOL_GPL(nf_flow_offload_rhash_params);
 186
 187  static int nf_flow_nat_port_tcp(struct sk_buff *skb, unsigned int thoff,
 188                                 __be16 port, __be16 new_port)
 189 @@ -398,6 +396,24 @@ int nf_flow_dnat_port(const struct flow_
 190  }
 191  EXPORT_SYMBOL_GPL(nf_flow_dnat_port);
 192
 193 +int nf_flow_table_init(struct nf_flowtable *flowtable)
 194 +{
 195 +       int err;
 196 +
 197 +       INIT_DEFERRABLE_WORK(&flowtable->gc_work, nf_flow_offload_work_gc);
 198 +
 199 +       err = rhashtable_init(&flowtable->rhashtable,
 200 +                             &nf_flow_offload_rhash_params);
 201 +       if (err < 0)
 202 +               return err;
 203 +
 204 +       queue_delayed_work(system_power_efficient_wq,
 205 +                          &flowtable->gc_work, HZ);
 206 +
 207 +       return 0;
 208 +}
 209 +EXPORT_SYMBOL_GPL(nf_flow_table_init);
 210 +
 211  static void nf_flow_table_do_cleanup(struct flow_offload *flow, void *data)
 212  {
 213         struct net_device *dev = data;
 214 @@ -423,8 +439,10 @@ EXPORT_SYMBOL_GPL(nf_flow_table_cleanup)
 215
 216  void nf_flow_table_free(struct nf_flowtable *flow_table)
 217  {
 218 +       cancel_delayed_work_sync(&flow_table->gc_work);
 219         nf_flow_table_iterate(flow_table, nf_flow_table_do_cleanup, NULL);
 220         WARN_ON(!nf_flow_offload_gc_step(flow_table));
 221 +       rhashtable_destroy(&flow_table->rhashtable);
 222  }
 223  EXPORT_SYMBOL_GPL(nf_flow_table_free);
 224
 225 --- a/net/netfilter/nf_flow_table_inet.c
 226 +++ b/net/netfilter/nf_flow_table_inet.c
 227 @@ -22,8 +22,7 @@ nf_flow_offload_inet_hook(void *priv, st
 228
 229  static struct nf_flowtable_type flowtable_inet = {
 230         .family         = NFPROTO_INET,
 231 -       .params         = &nf_flow_offload_rhash_params,
 232 -       .gc             = nf_flow_offload_work_gc,
 233 +       .init           = nf_flow_table_init,
 234         .free           = nf_flow_table_free,
 235         .hook           = nf_flow_offload_inet_hook,
 236         .owner          = THIS_MODULE,
 237 --- a/net/netfilter/nf_tables_api.c
 238 +++ b/net/netfilter/nf_tables_api.c
 239 @@ -5109,40 +5109,38 @@ static int nf_tables_newflowtable(struct
 240         }
 241
 242         flowtable->data.type = type;
 243 -       err = rhashtable_init(&flowtable->data.rhashtable, type->params);
 244 +       err = type->init(&flowtable->data);
 245         if (err < 0)
 246                 goto err3;
 247
 248         err = nf_tables_flowtable_parse_hook(&ctx, nla[NFTA_FLOWTABLE_HOOK],
 249                                              flowtable);
 250         if (err < 0)
 251 -               goto err3;
 252 +               goto err4;
 253
 254         for (i = 0; i < flowtable->ops_len; i++) {
 255                 err = nf_register_net_hook(net, &flowtable->ops[i]);
 256                 if (err < 0)
 257 -                       goto err4;
 258 +                       goto err5;
 259         }
 260
 261         err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
 262         if (err < 0)
 263 -               goto err5;
 264 -
 265 -       INIT_DEFERRABLE_WORK(&flowtable->data.gc_work, type->gc);
 266 -       queue_delayed_work(system_power_efficient_wq,
 267 -                          &flowtable->data.gc_work, HZ);
 268 +               goto err6;
 269
 270         list_add_tail_rcu(&flowtable->list, &table->flowtables);
 271         table->use++;
 272
 273         return 0;
 274 -err5:
 275 +err6:
 276         i = flowtable->ops_len;
 277 -err4:
 278 +err5:
 279         for (k = i - 1; k >= 0; k--)
 280                 nf_unregister_net_hook(net, &flowtable->ops[i]);
 281
 282         kfree(flowtable->ops);
 283 +err4:
 284 +       flowtable->data.type->free(&flowtable->data);
 285  err3:
 286         module_put(type->owner);
 287  err2:
 288 @@ -5423,10 +5421,8 @@ err:
 289
 290  static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
 291  {
 292 -       cancel_delayed_work_sync(&flowtable->data.gc_work);
 293         kfree(flowtable->name);
 294         flowtable->data.type->free(&flowtable->data);
 295 -       rhashtable_destroy(&flowtable->data.rhashtable);
 296         module_put(flowtable->data.type->owner);
 297  }
 298