include/linux/mroute_base.h

   1 #ifndef __LINUX_MROUTE_BASE_H
   2 #define __LINUX_MROUTE_BASE_H
   3
   4 #include <linux/netdevice.h>
   5 #include <linux/rhashtable.h>
   6 #include <linux/spinlock.h>
   7 #include <net/net_namespace.h>
   8 #include <net/sock.h>
   9 #include <net/fib_notifier.h>
  10
  11 /**
  12  * struct vif_device - interface representor for multicast routing
  13  * @dev: network device being used
  14  * @bytes_in: statistic; bytes ingressing
  15  * @bytes_out: statistic; bytes egresing
  16  * @pkt_in: statistic; packets ingressing
  17  * @pkt_out: statistic; packets egressing
  18  * @rate_limit: Traffic shaping (NI)
  19  * @threshold: TTL threshold
  20  * @flags: Control flags
  21  * @link: Physical interface index
  22  * @dev_parent_id: device parent id
  23  * @local: Local address
  24  * @remote: Remote address for tunnels
  25  */
  26 struct vif_device {
  27         struct net_device *dev;
  28         unsigned long bytes_in, bytes_out;
  29         unsigned long pkt_in, pkt_out;
  30         unsigned long rate_limit;
  31         unsigned char threshold;
  32         unsigned short flags;
  33         int link;
  34
  35         /* Currently only used by ipmr */
  36         struct netdev_phys_item_id dev_parent_id;
  37         __be32 local, remote;
  38 };
  39
  40 struct vif_entry_notifier_info {
  41         struct fib_notifier_info info;
  42         struct net_device *dev;
  43         unsigned short vif_index;
  44         unsigned short vif_flags;
  45         u32 tb_id;
  46 };
  47
  48 static inline int mr_call_vif_notifier(struct notifier_block *nb,
  49                                        struct net *net,
  50                                        unsigned short family,
  51                                        enum fib_event_type event_type,
  52                                        struct vif_device *vif,
  53                                        unsigned short vif_index, u32 tb_id)
  54 {
  55         struct vif_entry_notifier_info info = {
  56                 .info = {
  57                         .family = family,
  58                         .net = net,
  59                 },
  60                 .dev = vif->dev,
  61                 .vif_index = vif_index,
  62                 .vif_flags = vif->flags,
  63                 .tb_id = tb_id,
  64         };
  65
  66         return call_fib_notifier(nb, net, event_type, &info.info);
  67 }
  68
  69 static inline int mr_call_vif_notifiers(struct net *net,
  70                                         unsigned short family,
  71                                         enum fib_event_type event_type,
  72                                         struct vif_device *vif,
  73                                         unsigned short vif_index, u32 tb_id,
  74                                         unsigned int *ipmr_seq)
  75 {
  76         struct vif_entry_notifier_info info = {
  77                 .info = {
  78                         .family = family,
  79                         .net = net,
  80                 },
  81                 .dev = vif->dev,
  82                 .vif_index = vif_index,
  83                 .vif_flags = vif->flags,
  84                 .tb_id = tb_id,
  85         };
  86
  87         ASSERT_RTNL();
  88         (*ipmr_seq)++;
  89         return call_fib_notifiers(net, event_type, &info.info);
  90 }
  91
  92 #ifndef MAXVIFS
  93 /* This one is nasty; value is defined in uapi using different symbols for
  94  * mroute and morute6 but both map into same 32.
  95  */
  96 #define MAXVIFS 32
  97 #endif
  98
  99 #define VIF_EXISTS(_mrt, _idx) (!!((_mrt)->vif_table[_idx].dev))
 100
 101 /* mfc_flags:
 102  * MFC_STATIC - the entry was added statically (not by a routing daemon)
 103  * MFC_OFFLOAD - the entry was offloaded to the hardware
 104  */
 105 enum {
 106         MFC_STATIC = BIT(0),
 107         MFC_OFFLOAD = BIT(1),
 108 };
 109
 110 /**
 111  * struct mr_mfc - common multicast routing entries
 112  * @mnode: rhashtable list
 113  * @mfc_parent: source interface (iif)
 114  * @mfc_flags: entry flags
 115  * @expires: unresolved entry expire time
 116  * @unresolved: unresolved cached skbs
 117  * @last_assert: time of last assert
 118  * @minvif: minimum VIF id
 119  * @maxvif: maximum VIF id
 120  * @bytes: bytes that have passed for this entry
 121  * @pkt: packets that have passed for this entry
 122  * @wrong_if: number of wrong source interface hits
 123  * @lastuse: time of last use of the group (traffic or update)
 124  * @ttls: OIF TTL threshold array
 125  * @refcount: reference count for this entry
 126  * @list: global entry list
 127  * @rcu: used for entry destruction
 128  * @free: Operation used for freeing an entry under RCU
 129  */
 130 struct mr_mfc {
 131         struct rhlist_head mnode;
 132         unsigned short mfc_parent;
 133         int mfc_flags;
 134
 135         union {
 136                 struct {
 137                         unsigned long expires;
 138                         struct sk_buff_head unresolved;
 139                 } unres;
 140                 struct {
 141                         unsigned long last_assert;
 142                         int minvif;
 143                         int maxvif;
 144                         unsigned long bytes;
 145                         unsigned long pkt;
 146                         unsigned long wrong_if;
 147                         unsigned long lastuse;
 148                         unsigned char ttls[MAXVIFS];
 149                         refcount_t refcount;
 150                 } res;
 151         } mfc_un;
 152         struct list_head list;
 153         struct rcu_head rcu;
 154         void (*free)(struct rcu_head *head);
 155 };
 156
 157 static inline void mr_cache_put(struct mr_mfc *c)
 158 {
 159         if (refcount_dec_and_test(&c->mfc_un.res.refcount))
 160                 call_rcu(&c->rcu, c->free);
 161 }
 162
 163 static inline void mr_cache_hold(struct mr_mfc *c)
 164 {
 165         refcount_inc(&c->mfc_un.res.refcount);
 166 }
 167
 168 struct mfc_entry_notifier_info {
 169         struct fib_notifier_info info;
 170         struct mr_mfc *mfc;
 171         u32 tb_id;
 172 };
 173
 174 static inline int mr_call_mfc_notifier(struct notifier_block *nb,
 175                                        struct net *net,
 176                                        unsigned short family,
 177                                        enum fib_event_type event_type,
 178                                        struct mr_mfc *mfc, u32 tb_id)
 179 {
 180         struct mfc_entry_notifier_info info = {
 181                 .info = {
 182                         .family = family,
 183                         .net = net,
 184                 },
 185                 .mfc = mfc,
 186                 .tb_id = tb_id
 187         };
 188
 189         return call_fib_notifier(nb, net, event_type, &info.info);
 190 }
 191
 192 static inline int mr_call_mfc_notifiers(struct net *net,
 193                                         unsigned short family,
 194                                         enum fib_event_type event_type,
 195                                         struct mr_mfc *mfc, u32 tb_id,
 196                                         unsigned int *ipmr_seq)
 197 {
 198         struct mfc_entry_notifier_info info = {
 199                 .info = {
 200                         .family = family,
 201                         .net = net,
 202                 },
 203                 .mfc = mfc,
 204                 .tb_id = tb_id
 205         };
 206
 207         ASSERT_RTNL();
 208         (*ipmr_seq)++;
 209         return call_fib_notifiers(net, event_type, &info.info);
 210 }
 211
 212 struct mr_table;
 213
 214 /**
 215  * struct mr_table_ops - callbacks and info for protocol-specific ops
 216  * @rht_params: parameters for accessing the MFC hash
 217  * @cmparg_any: a hash key to be used for matching on (*,*) routes
 218  */
 219 struct mr_table_ops {
 220         const struct rhashtable_params *rht_params;
 221         void *cmparg_any;
 222 };
 223
 224 /**
 225  * struct mr_table - a multicast routing table
 226  * @list: entry within a list of multicast routing tables
 227  * @net: net where this table belongs
 228  * @ops: protocol specific operations
 229  * @id: identifier of the table
 230  * @mroute_sk: socket associated with the table
 231  * @ipmr_expire_timer: timer for handling unresolved routes
 232  * @mfc_unres_queue: list of unresolved MFC entries
 233  * @vif_table: array containing all possible vifs
 234  * @mfc_hash: Hash table of all resolved routes for easy lookup
 235  * @mfc_cache_list: list of resovled routes for possible traversal
 236  * @maxvif: Identifier of highest value vif currently in use
 237  * @cache_resolve_queue_len: current size of unresolved queue
 238  * @mroute_do_assert: Whether to inform userspace on wrong ingress
 239  * @mroute_do_pim: Whether to receive IGMP PIMv1
 240  * @mroute_reg_vif_num: PIM-device vif index
 241  */
 242 struct mr_table {
 243         struct list_head        list;
 244         possible_net_t          net;
 245         struct mr_table_ops     ops;
 246         u32                     id;
 247         struct sock __rcu       *mroute_sk;
 248         struct timer_list       ipmr_expire_timer;
 249         struct list_head        mfc_unres_queue;
 250         struct vif_device       vif_table[MAXVIFS];
 251         struct rhltable         mfc_hash;
 252         struct list_head        mfc_cache_list;
 253         int                     maxvif;
 254         atomic_t                cache_resolve_queue_len;
 255         bool                    mroute_do_assert;
 256         bool                    mroute_do_pim;
 257         int                     mroute_reg_vif_num;
 258 };
 259
 260 #ifdef CONFIG_IP_MROUTE_COMMON
 261 void vif_device_init(struct vif_device *v,
 262                      struct net_device *dev,
 263                      unsigned long rate_limit,
 264                      unsigned char threshold,
 265                      unsigned short flags,
 266                      unsigned short get_iflink_mask);
 267
 268 struct mr_table *
 269 mr_table_alloc(struct net *net, u32 id,
 270                struct mr_table_ops *ops,
 271                void (*expire_func)(struct timer_list *t),
 272                void (*table_set)(struct mr_table *mrt,
 273                                  struct net *net));
 274
 275 /* These actually return 'struct mr_mfc *', but to avoid need for explicit
 276  * castings they simply return void.
 277  */
 278 void *mr_mfc_find_parent(struct mr_table *mrt,
 279                          void *hasharg, int parent);
 280 void *mr_mfc_find_any_parent(struct mr_table *mrt, int vifi);
 281 void *mr_mfc_find_any(struct mr_table *mrt, int vifi, void *hasharg);
 282
 283 int mr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb,
 284                    struct mr_mfc *c, struct rtmsg *rtm);
 285 int mr_rtm_dumproute(struct sk_buff *skb, struct netlink_callback *cb,
 286                      struct mr_table *(*iter)(struct net *net,
 287                                               struct mr_table *mrt),
 288                      int (*fill)(struct mr_table *mrt,
 289                                  struct sk_buff *skb,
 290                                  u32 portid, u32 seq, struct mr_mfc *c,
 291                                  int cmd, int flags),
 292                      spinlock_t *lock);
 293
 294 int mr_dump(struct net *net, struct notifier_block *nb, unsigned short family,
 295             int (*rules_dump)(struct net *net,
 296                               struct notifier_block *nb),
 297             struct mr_table *(*mr_iter)(struct net *net,
 298                                         struct mr_table *mrt),
 299             rwlock_t *mrt_lock);
 300 #else
 301 static inline void vif_device_init(struct vif_device *v,
 302                                    struct net_device *dev,
 303                                    unsigned long rate_limit,
 304                                    unsigned char threshold,
 305                                    unsigned short flags,
 306                                    unsigned short get_iflink_mask)
 307 {
 308 }
 309
 310 static inline void *
 311 mr_table_alloc(struct net *net, u32 id,
 312                struct mr_table_ops *ops,
 313                void (*expire_func)(struct timer_list *t),
 314                void (*table_set)(struct mr_table *mrt,
 315                                  struct net *net))
 316 {
 317         return NULL;
 318 }
 319
 320 static inline void *mr_mfc_find_parent(struct mr_table *mrt,
 321                                        void *hasharg, int parent)
 322 {
 323         return NULL;
 324 }
 325
 326 static inline void *mr_mfc_find_any_parent(struct mr_table *mrt,
 327                                            int vifi)
 328 {
 329         return NULL;
 330 }
 331
 332 static inline struct mr_mfc *mr_mfc_find_any(struct mr_table *mrt,
 333                                              int vifi, void *hasharg)
 334 {
 335         return NULL;
 336 }
 337
 338 static inline int mr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb,
 339                                  struct mr_mfc *c, struct rtmsg *rtm)
 340 {
 341         return -EINVAL;
 342 }
 343
 344 static inline int
 345 mr_rtm_dumproute(struct sk_buff *skb, struct netlink_callback *cb,
 346                  struct mr_table *(*iter)(struct net *net,
 347                                           struct mr_table *mrt),
 348                  int (*fill)(struct mr_table *mrt,
 349                              struct sk_buff *skb,
 350                              u32 portid, u32 seq, struct mr_mfc *c,
 351                              int cmd, int flags),
 352                  spinlock_t *lock)
 353 {
 354         return -EINVAL;
 355 }
 356
 357 static inline int mr_dump(struct net *net, struct notifier_block *nb,
 358                           unsigned short family,
 359                           int (*rules_dump)(struct net *net,
 360                                             struct notifier_block *nb),
 361                           struct mr_table *(*mr_iter)(struct net *net,
 362                                                       struct mr_table *mrt),
 363                           rwlock_t *mrt_lock)
 364 {
 365         return -EINVAL;
 366 }
 367 #endif
 368
 369 static inline void *mr_mfc_find(struct mr_table *mrt, void *hasharg)
 370 {
 371         return mr_mfc_find_parent(mrt, hasharg, -1);
 372 }
 373
 374 #ifdef CONFIG_PROC_FS
 375 struct mr_vif_iter {
 376         struct seq_net_private p;
 377         struct mr_table *mrt;
 378         int ct;
 379 };
 380
 381 struct mr_mfc_iter {
 382         struct seq_net_private p;
 383         struct mr_table *mrt;
 384         struct list_head *cache;
 385
 386         /* Lock protecting the mr_table's unresolved queue */
 387         spinlock_t *lock;
 388 };
 389
 390 #ifdef CONFIG_IP_MROUTE_COMMON
 391 void *mr_vif_seq_idx(struct net *net, struct mr_vif_iter *iter, loff_t pos);
 392 void *mr_vif_seq_next(struct seq_file *seq, void *v, loff_t *pos);
 393
 394 static inline void *mr_vif_seq_start(struct seq_file *seq, loff_t *pos)
 395 {
 396         return *pos ? mr_vif_seq_idx(seq_file_net(seq),
 397                                      seq->private, *pos - 1)
 398                     : SEQ_START_TOKEN;
 399 }
 400
 401 /* These actually return 'struct mr_mfc *', but to avoid need for explicit
 402  * castings they simply return void.
 403  */
 404 void *mr_mfc_seq_idx(struct net *net,
 405                      struct mr_mfc_iter *it, loff_t pos);
 406 void *mr_mfc_seq_next(struct seq_file *seq, void *v,
 407                       loff_t *pos);
 408
 409 static inline void *mr_mfc_seq_start(struct seq_file *seq, loff_t *pos,
 410                                      struct mr_table *mrt, spinlock_t *lock)
 411 {
 412         struct mr_mfc_iter *it = seq->private;
 413
 414         it->mrt = mrt;
 415         it->cache = NULL;
 416         it->lock = lock;
 417
 418         return *pos ? mr_mfc_seq_idx(seq_file_net(seq),
 419                                      seq->private, *pos - 1)
 420                     : SEQ_START_TOKEN;
 421 }
 422
 423 static inline void mr_mfc_seq_stop(struct seq_file *seq, void *v)
 424 {
 425         struct mr_mfc_iter *it = seq->private;
 426         struct mr_table *mrt = it->mrt;
 427
 428         if (it->cache == &mrt->mfc_unres_queue)
 429                 spin_unlock_bh(it->lock);
 430         else if (it->cache == &mrt->mfc_cache_list)
 431                 rcu_read_unlock();
 432 }
 433 #else
 434 static inline void *mr_vif_seq_idx(struct net *net, struct mr_vif_iter *iter,
 435                                    loff_t pos)
 436 {
 437         return NULL;
 438 }
 439
 440 static inline void *mr_vif_seq_next(struct seq_file *seq,
 441                                     void *v, loff_t *pos)
 442 {
 443         return NULL;
 444 }
 445
 446 static inline void *mr_vif_seq_start(struct seq_file *seq, loff_t *pos)
 447 {
 448         return NULL;
 449 }
 450
 451 static inline void *mr_mfc_seq_idx(struct net *net,
 452                                    struct mr_mfc_iter *it, loff_t pos)
 453 {
 454         return NULL;
 455 }
 456
 457 static inline void *mr_mfc_seq_next(struct seq_file *seq, void *v,
 458                                     loff_t *pos)
 459 {
 460         return NULL;
 461 }
 462
 463 static inline void *mr_mfc_seq_start(struct seq_file *seq, loff_t *pos,
 464                                      struct mr_table *mrt, spinlock_t *lock)
 465 {
 466         return NULL;
 467 }
 468
 469 static inline void mr_mfc_seq_stop(struct seq_file *seq, void *v)
 470 {
 471 }
 472 #endif
 473 #endif
 474 #endif