include/net/netfilter/nf_flow_table.h

   1 #ifndef _NF_FLOW_TABLE_H
   2 #define _NF_FLOW_TABLE_H
   3
   4 #include <linux/in.h>
   5 #include <linux/in6.h>
   6 #include <linux/netdevice.h>
   7 #include <linux/rhashtable-types.h>
   8 #include <linux/rcupdate.h>
   9 #include <linux/netfilter.h>
  10 #include <linux/netfilter/nf_conntrack_tuple_common.h>
  11 #include <net/flow_offload.h>
  12 #include <net/dst.h>
  13
  14 struct nf_flowtable;
  15 struct nf_flow_rule;
  16 struct flow_offload;
  17 enum flow_offload_tuple_dir;
  18
  19 struct nf_flow_key {
  20         struct flow_dissector_key_meta                  meta;
  21         struct flow_dissector_key_control               control;
  22         struct flow_dissector_key_control               enc_control;
  23         struct flow_dissector_key_basic                 basic;
  24         struct flow_dissector_key_vlan                  vlan;
  25         struct flow_dissector_key_vlan                  cvlan;
  26         union {
  27                 struct flow_dissector_key_ipv4_addrs    ipv4;
  28                 struct flow_dissector_key_ipv6_addrs    ipv6;
  29         };
  30         struct flow_dissector_key_keyid                 enc_key_id;
  31         union {
  32                 struct flow_dissector_key_ipv4_addrs    enc_ipv4;
  33                 struct flow_dissector_key_ipv6_addrs    enc_ipv6;
  34         };
  35         struct flow_dissector_key_tcp                   tcp;
  36         struct flow_dissector_key_ports                 tp;
  37 } __aligned(BITS_PER_LONG / 8); /* Ensure that we can do comparisons as longs. */
  38
  39 struct nf_flow_match {
  40         struct flow_dissector   dissector;
  41         struct nf_flow_key      key;
  42         struct nf_flow_key      mask;
  43 };
  44
  45 struct nf_flow_rule {
  46         struct nf_flow_match    match;
  47         struct flow_rule        *rule;
  48 };
  49
  50 struct nf_flowtable_type {
  51         struct list_head                list;
  52         int                             family;
  53         int                             (*init)(struct nf_flowtable *ft);
  54         int                             (*setup)(struct nf_flowtable *ft,
  55                                                  struct net_device *dev,
  56                                                  enum flow_block_command cmd);
  57         int                             (*action)(struct net *net,
  58                                                   const struct flow_offload *flow,
  59                                                   enum flow_offload_tuple_dir dir,
  60                                                   struct nf_flow_rule *flow_rule);
  61         void                            (*free)(struct nf_flowtable *ft);
  62         nf_hookfn                       *hook;
  63         struct module                   *owner;
  64 };
  65
  66 enum nf_flowtable_flags {
  67         NF_FLOWTABLE_HW_OFFLOAD         = 0x1,  /* NFT_FLOWTABLE_HW_OFFLOAD */
  68         NF_FLOWTABLE_COUNTER            = 0x2,  /* NFT_FLOWTABLE_COUNTER */
  69 };
  70
  71 struct nf_flowtable {
  72         struct list_head                list;
  73         struct rhashtable               rhashtable;
  74         int                             priority;
  75         const struct nf_flowtable_type  *type;
  76         struct delayed_work             gc_work;
  77         unsigned int                    flags;
  78         struct flow_block               flow_block;
  79         struct rw_semaphore             flow_block_lock; /* Guards flow_block */
  80         possible_net_t                  net;
  81 };
  82
  83 static inline bool nf_flowtable_hw_offload(struct nf_flowtable *flowtable)
  84 {
  85         return flowtable->flags & NF_FLOWTABLE_HW_OFFLOAD;
  86 }
  87
  88 enum flow_offload_tuple_dir {
  89         FLOW_OFFLOAD_DIR_ORIGINAL = IP_CT_DIR_ORIGINAL,
  90         FLOW_OFFLOAD_DIR_REPLY = IP_CT_DIR_REPLY,
  91 };
  92 #define FLOW_OFFLOAD_DIR_MAX    IP_CT_DIR_MAX
  93
  94 enum flow_offload_xmit_type {
  95         FLOW_OFFLOAD_XMIT_UNSPEC        = 0,
  96         FLOW_OFFLOAD_XMIT_NEIGH,
  97         FLOW_OFFLOAD_XMIT_XFRM,
  98         FLOW_OFFLOAD_XMIT_DIRECT,
  99 };
 100
 101 #define NF_FLOW_TABLE_ENCAP_MAX         2
 102
 103 struct flow_offload_tuple {
 104         union {
 105                 struct in_addr          src_v4;
 106                 struct in6_addr         src_v6;
 107         };
 108         union {
 109                 struct in_addr          dst_v4;
 110                 struct in6_addr         dst_v6;
 111         };
 112         struct {
 113                 __be16                  src_port;
 114                 __be16                  dst_port;
 115         };
 116
 117         int                             iifidx;
 118
 119         u8                              l3proto;
 120         u8                              l4proto;
 121         struct {
 122                 u16                     id;
 123                 __be16                  proto;
 124         } encap[NF_FLOW_TABLE_ENCAP_MAX];
 125
 126         /* All members above are keys for lookups, see flow_offload_hash(). */
 127         struct { }                      __hash;
 128
 129         u8                              dir:2,
 130                                         xmit_type:2,
 131                                         encap_num:2,
 132                                         in_vlan_ingress:2;
 133         u16                             mtu;
 134         union {
 135                 struct {
 136                         struct dst_entry *dst_cache;
 137                         u32             dst_cookie;
 138                 };
 139                 struct {
 140                         u32             ifidx;
 141                         u32             hw_ifidx;
 142                         u8              h_source[ETH_ALEN];
 143                         u8              h_dest[ETH_ALEN];
 144                 } out;
 145         };
 146 };
 147
 148 struct flow_offload_tuple_rhash {
 149         struct rhash_head               node;
 150         struct flow_offload_tuple       tuple;
 151 };
 152
 153 enum nf_flow_flags {
 154         NF_FLOW_SNAT,
 155         NF_FLOW_DNAT,
 156         NF_FLOW_TEARDOWN,
 157         NF_FLOW_HW,
 158         NF_FLOW_HW_DYING,
 159         NF_FLOW_HW_DEAD,
 160         NF_FLOW_HW_PENDING,
 161 };
 162
 163 enum flow_offload_type {
 164         NF_FLOW_OFFLOAD_UNSPEC  = 0,
 165         NF_FLOW_OFFLOAD_ROUTE,
 166 };
 167
 168 struct flow_offload {
 169         struct flow_offload_tuple_rhash         tuplehash[FLOW_OFFLOAD_DIR_MAX];
 170         struct nf_conn                          *ct;
 171         unsigned long                           flags;
 172         u16                                     type;
 173         u32                                     timeout;
 174         struct rcu_head                         rcu_head;
 175 };
 176
 177 #define NF_FLOW_TIMEOUT (30 * HZ)
 178 #define nf_flowtable_time_stamp (u32)jiffies
 179
 180 static inline __s32 nf_flow_timeout_delta(unsigned int timeout)
 181 {
 182         return (__s32)(timeout - nf_flowtable_time_stamp);
 183 }
 184
 185 struct nf_flow_route {
 186         struct {
 187                 struct dst_entry                *dst;
 188                 struct {
 189                         u32                     ifindex;
 190                         struct {
 191                                 u16             id;
 192                                 __be16          proto;
 193                         } encap[NF_FLOW_TABLE_ENCAP_MAX];
 194                         u8                      num_encaps:2,
 195                                                 ingress_vlans:2;
 196                 } in;
 197                 struct {
 198                         u32                     ifindex;
 199                         u32                     hw_ifindex;
 200                         u8                      h_source[ETH_ALEN];
 201                         u8                      h_dest[ETH_ALEN];
 202                 } out;
 203                 enum flow_offload_xmit_type     xmit_type;
 204         } tuple[FLOW_OFFLOAD_DIR_MAX];
 205 };
 206
 207 struct flow_offload *flow_offload_alloc(struct nf_conn *ct);
 208 void flow_offload_free(struct flow_offload *flow);
 209
 210 static inline int
 211 nf_flow_table_offload_add_cb(struct nf_flowtable *flow_table,
 212                              flow_setup_cb_t *cb, void *cb_priv)
 213 {
 214         struct flow_block *block = &flow_table->flow_block;
 215         struct flow_block_cb *block_cb;
 216         int err = 0;
 217
 218         down_write(&flow_table->flow_block_lock);
 219         block_cb = flow_block_cb_lookup(block, cb, cb_priv);
 220         if (block_cb) {
 221                 err = -EEXIST;
 222                 goto unlock;
 223         }
 224
 225         block_cb = flow_block_cb_alloc(cb, cb_priv, cb_priv, NULL);
 226         if (IS_ERR(block_cb)) {
 227                 err = PTR_ERR(block_cb);
 228                 goto unlock;
 229         }
 230
 231         list_add_tail(&block_cb->list, &block->cb_list);
 232
 233 unlock:
 234         up_write(&flow_table->flow_block_lock);
 235         return err;
 236 }
 237
 238 static inline void
 239 nf_flow_table_offload_del_cb(struct nf_flowtable *flow_table,
 240                              flow_setup_cb_t *cb, void *cb_priv)
 241 {
 242         struct flow_block *block = &flow_table->flow_block;
 243         struct flow_block_cb *block_cb;
 244
 245         down_write(&flow_table->flow_block_lock);
 246         block_cb = flow_block_cb_lookup(block, cb, cb_priv);
 247         if (block_cb) {
 248                 list_del(&block_cb->list);
 249                 flow_block_cb_free(block_cb);
 250         } else {
 251                 WARN_ON(true);
 252         }
 253         up_write(&flow_table->flow_block_lock);
 254 }
 255
 256 int flow_offload_route_init(struct flow_offload *flow,
 257                             const struct nf_flow_route *route);
 258
 259 int flow_offload_add(struct nf_flowtable *flow_table, struct flow_offload *flow);
 260 void flow_offload_refresh(struct nf_flowtable *flow_table,
 261                           struct flow_offload *flow);
 262
 263 struct flow_offload_tuple_rhash *flow_offload_lookup(struct nf_flowtable *flow_table,
 264                                                      struct flow_offload_tuple *tuple);
 265 void nf_flow_table_gc_cleanup(struct nf_flowtable *flowtable,
 266                               struct net_device *dev);
 267 void nf_flow_table_cleanup(struct net_device *dev);
 268
 269 int nf_flow_table_init(struct nf_flowtable *flow_table);
 270 void nf_flow_table_free(struct nf_flowtable *flow_table);
 271
 272 void flow_offload_teardown(struct flow_offload *flow);
 273
 274 void nf_flow_snat_port(const struct flow_offload *flow,
 275                        struct sk_buff *skb, unsigned int thoff,
 276                        u8 protocol, enum flow_offload_tuple_dir dir);
 277 void nf_flow_dnat_port(const struct flow_offload *flow,
 278                        struct sk_buff *skb, unsigned int thoff,
 279                        u8 protocol, enum flow_offload_tuple_dir dir);
 280
 281 struct flow_ports {
 282         __be16 source, dest;
 283 };
 284
 285 unsigned int nf_flow_offload_ip_hook(void *priv, struct sk_buff *skb,
 286                                      const struct nf_hook_state *state);
 287 unsigned int nf_flow_offload_ipv6_hook(void *priv, struct sk_buff *skb,
 288                                        const struct nf_hook_state *state);
 289
 290 #define MODULE_ALIAS_NF_FLOWTABLE(family)       \
 291         MODULE_ALIAS("nf-flowtable-" __stringify(family))
 292
 293 void nf_flow_offload_add(struct nf_flowtable *flowtable,
 294                          struct flow_offload *flow);
 295 void nf_flow_offload_del(struct nf_flowtable *flowtable,
 296                          struct flow_offload *flow);
 297 void nf_flow_offload_stats(struct nf_flowtable *flowtable,
 298                            struct flow_offload *flow);
 299
 300 void nf_flow_table_offload_flush(struct nf_flowtable *flowtable);
 301 int nf_flow_table_offload_setup(struct nf_flowtable *flowtable,
 302                                 struct net_device *dev,
 303                                 enum flow_block_command cmd);
 304 int nf_flow_rule_route_ipv4(struct net *net, const struct flow_offload *flow,
 305                             enum flow_offload_tuple_dir dir,
 306                             struct nf_flow_rule *flow_rule);
 307 int nf_flow_rule_route_ipv6(struct net *net, const struct flow_offload *flow,
 308                             enum flow_offload_tuple_dir dir,
 309                             struct nf_flow_rule *flow_rule);
 310
 311 int nf_flow_table_offload_init(void);
 312 void nf_flow_table_offload_exit(void);
 313
 314 #endif /* _NF_FLOW_TABLE_H */