Quelle mroute_base.h Sprache: C

#ifndef __LINUX_MROUTE_BASE_H
#define __LINUX_MROUTE_BASE_H

#include <linux/netdevice.h>
#include <linux/rhashtable-types.h>
#include <linux/spinlock.h>
#include <net/net_namespace.h>
#include <net/sock.h>
#include <net/fib_notifier.h>
#include <net/ip_fib.h>

/**
* struct vif_device - interface representor for multicast routing
* @dev: network device being used
* @dev_tracker: refcount tracker for @dev reference
* @bytes_in: statistic; bytes ingressing
* @bytes_out: statistic; bytes egresing
* @pkt_in: statistic; packets ingressing
* @pkt_out: statistic; packets egressing
* @rate_limit: Traffic shaping (NI)
* @threshold: TTL threshold
* @flags: Control flags
* @link: Physical interface index
* @dev_parent_id: device parent id
* @local: Local address
* @remote: Remote address for tunnels
*/
struct vif_device {
struct net_device __rcu *dev;
netdevice_tracker dev_tracker;
unsigned long bytes_in, bytes_out;
unsigned long pkt_in, pkt_out;
unsigned long rate_limit;
unsigned char threshold;
unsigned short flags;
int link;

/* Currently only used by ipmr */
struct netdev_phys_item_id dev_parent_id;
__be32 local, remote;
};

struct vif_entry_notifier_info {
struct fib_notifier_info info;
struct net_device *dev;
unsigned short vif_index;
unsigned short vif_flags;
u32 tb_id;
};

static inline int mr_call_vif_notifier(struct notifier_block *nb,
           unsigned short family,
           enum fib_event_type event_type,
           struct vif_device *vif,
           struct net_device *vif_dev,
           unsigned short vif_index, u32 tb_id,
           struct netlink_ext_ack *extack)
{
struct vif_entry_notifier_info info = {
  .info = {
   .family = family,
   .extack = extack,
  },
  .dev = vif_dev,
  .vif_index = vif_index,
  .vif_flags = vif->flags,
  .tb_id = tb_id,
};

return call_fib_notifier(nb, event_type, &info.info);
}

static inline int mr_call_vif_notifiers(struct net *net,
     unsigned short family,
     enum fib_event_type event_type,
     struct vif_device *vif,
     struct net_device *vif_dev,
     unsigned short vif_index, u32 tb_id,
     unsigned int *ipmr_seq)
{
struct vif_entry_notifier_info info = {
  .info = {
   .family = family,
  },
  .dev = vif_dev,
  .vif_index = vif_index,
  .vif_flags = vif->flags,
  .tb_id = tb_id,
};

ASSERT_RTNL();
(*ipmr_seq)++;
return call_fib_notifiers(net, event_type, &info.info);
}

#ifndef MAXVIFS
/* This one is nasty; value is defined in uapi using different symbols for
* mroute and morute6 but both map into same 32.
*/
#define MAXVIFS 32
#endif

/* Note: This helper is deprecated. */
#define VIF_EXISTS(_mrt, _idx) (!!rcu_access_pointer((_mrt)->vif_table[_idx].dev))

/* mfc_flags:
* MFC_STATIC - the entry was added statically (not by a routing daemon)
* MFC_OFFLOAD - the entry was offloaded to the hardware
*/
enum {
MFC_STATIC = BIT(0),
MFC_OFFLOAD = BIT(1),
};

/**
* struct mr_mfc - common multicast routing entries
* @mnode: rhashtable list
* @mfc_parent: source interface (iif)
* @mfc_flags: entry flags
* @expires: unresolved entry expire time
* @unresolved: unresolved cached skbs
* @last_assert: time of last assert
* @minvif: minimum VIF id
* @maxvif: maximum VIF id
* @bytes: bytes that have passed for this entry
* @pkt: packets that have passed for this entry
* @wrong_if: number of wrong source interface hits
* @lastuse: time of last use of the group (traffic or update)
* @ttls: OIF TTL threshold array
* @refcount: reference count for this entry
* @list: global entry list
* @rcu: used for entry destruction
* @free: Operation used for freeing an entry under RCU
*/
struct mr_mfc {
struct rhlist_head mnode;
unsigned short mfc_parent;
int mfc_flags;

union {
  struct {
   unsigned long expires;
   struct sk_buff_head unresolved;
  } unres;
  struct {
   unsigned long last_assert;
   int minvif;
   int maxvif;
   atomic_long_t bytes;
   atomic_long_t pkt;
   atomic_long_t wrong_if;
   unsigned long lastuse;
   unsigned char ttls[MAXVIFS];
   refcount_t refcount;
  } res;
} mfc_un;
struct list_head list;
struct rcu_head rcu;
void (*free)(struct rcu_head *head);
};

static inline void mr_cache_put(struct mr_mfc *c)
{
if (refcount_dec_and_test(&c->mfc_un.res.refcount))
  call_rcu(&c->rcu, c->free);
}

static inline void mr_cache_hold(struct mr_mfc *c)
{
refcount_inc(&c->mfc_un.res.refcount);
}

struct mfc_entry_notifier_info {
struct fib_notifier_info info;
struct mr_mfc *mfc;
u32 tb_id;
};

static inline int mr_call_mfc_notifier(struct notifier_block *nb,
           unsigned short family,
           enum fib_event_type event_type,
           struct mr_mfc *mfc, u32 tb_id,
           struct netlink_ext_ack *extack)
{
struct mfc_entry_notifier_info info = {
  .info = {
   .family = family,
   .extack = extack,
  },
  .mfc = mfc,
  .tb_id = tb_id
};

return call_fib_notifier(nb, event_type, &info.info);
}

static inline int mr_call_mfc_notifiers(struct net *net,
     unsigned short family,
     enum fib_event_type event_type,
     struct mr_mfc *mfc, u32 tb_id,
     unsigned int *ipmr_seq)
{
struct mfc_entry_notifier_info info = {
  .info = {
   .family = family,
  },
  .mfc = mfc,
  .tb_id = tb_id
};

ASSERT_RTNL();
(*ipmr_seq)++;
return call_fib_notifiers(net, event_type, &info.info);
}

struct mr_table;

/**
* struct mr_table_ops - callbacks and info for protocol-specific ops
* @rht_params: parameters for accessing the MFC hash
* @cmparg_any: a hash key to be used for matching on (*,*) routes
*/
struct mr_table_ops {
const struct rhashtable_params *rht_params;
void *cmparg_any;
};

/**
* struct mr_table - a multicast routing table
* @list: entry within a list of multicast routing tables
* @net: net where this table belongs
* @ops: protocol specific operations
* @id: identifier of the table
* @mroute_sk: socket associated with the table
* @ipmr_expire_timer: timer for handling unresolved routes
* @mfc_unres_queue: list of unresolved MFC entries
* @vif_table: array containing all possible vifs
* @mfc_hash: Hash table of all resolved routes for easy lookup
* @mfc_cache_list: list of resovled routes for possible traversal
* @maxvif: Identifier of highest value vif currently in use
* @cache_resolve_queue_len: current size of unresolved queue
* @mroute_do_assert: Whether to inform userspace on wrong ingress
* @mroute_do_pim: Whether to receive IGMP PIMv1
* @mroute_reg_vif_num: PIM-device vif index
*/
struct mr_table {
struct list_head list;
possible_net_t  net;
struct mr_table_ops ops;
u32   id;
struct sock __rcu *mroute_sk;
struct timer_list ipmr_expire_timer;
struct list_head mfc_unres_queue;
struct vif_device vif_table[MAXVIFS];
struct rhltable  mfc_hash;
struct list_head mfc_cache_list;
int   maxvif;
atomic_t  cache_resolve_queue_len;
bool   mroute_do_assert;
bool   mroute_do_pim;
bool   mroute_do_wrvifwhole;
int   mroute_reg_vif_num;
};

static inline bool mr_can_free_table(struct net *net)
{
return !check_net(net) || !net_initialized(net);
}

#ifdef CONFIG_IP_MROUTE_COMMON
void vif_device_init(struct vif_device *v,
       struct net_device *dev,
       unsigned long rate_limit,
       unsigned char threshold,
       unsigned short flags,
       unsigned short get_iflink_mask);

struct mr_table *
mr_table_alloc(struct net *net, u32 id,
        struct mr_table_ops *ops,
        void (*expire_func)(struct timer_list *t),
        void (*table_set)(struct mr_table *mrt,
     struct net *net));

/* These actually return 'struct mr_mfc *', but to avoid need for explicit
* castings they simply return void.
*/
void *mr_mfc_find_parent(struct mr_table *mrt,
    void *hasharg, int parent);
void *mr_mfc_find_any_parent(struct mr_table *mrt, int vifi);
void *mr_mfc_find_any(struct mr_table *mrt, int vifi, void *hasharg);

int mr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb,
     struct mr_mfc *c, struct rtmsg *rtm);
int mr_table_dump(struct mr_table *mrt, struct sk_buff *skb,
    struct netlink_callback *cb,
    int (*fill)(struct mr_table *mrt, struct sk_buff *skb,
         u32 portid, u32 seq, struct mr_mfc *c,
         int cmd, int flags),
    spinlock_t *lock, struct fib_dump_filter *filter);
int mr_rtm_dumproute(struct sk_buff *skb, struct netlink_callback *cb,
       struct mr_table *(*iter)(struct net *net,
           struct mr_table *mrt),
       int (*fill)(struct mr_table *mrt,
     struct sk_buff *skb,
     u32 portid, u32 seq, struct mr_mfc *c,
     int cmd, int flags),
       spinlock_t *lock, struct fib_dump_filter *filter);

int mr_dump(struct net *net, struct notifier_block *nb, unsigned short family,
     int (*rules_dump)(struct net *net,
         struct notifier_block *nb,
         struct netlink_ext_ack *extack),
     struct mr_table *(*mr_iter)(struct net *net,
     struct mr_table *mrt),
     struct netlink_ext_ack *extack);
#else
static inline void vif_device_init(struct vif_device *v,
       struct net_device *dev,
       unsigned long rate_limit,
       unsigned char threshold,
       unsigned short flags,
       unsigned short get_iflink_mask)
{
}

static inline void *mr_mfc_find_parent(struct mr_table *mrt,
           void *hasharg, int parent)
{
return NULL;
}

static inline void *mr_mfc_find_any_parent(struct mr_table *mrt,
        int vifi)
{
return NULL;
}

static inline struct mr_mfc *mr_mfc_find_any(struct mr_table *mrt,
          int vifi, void *hasharg)
{
return NULL;
}

static inline int mr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb,
     struct mr_mfc *c, struct rtmsg *rtm)
{
return -EINVAL;
}

static inline int
mr_rtm_dumproute(struct sk_buff *skb, struct netlink_callback *cb,
   struct mr_table *(*iter)(struct net *net,
       struct mr_table *mrt),
   int (*fill)(struct mr_table *mrt,
        struct sk_buff *skb,
        u32 portid, u32 seq, struct mr_mfc *c,
        int cmd, int flags),
   spinlock_t *lock, struct fib_dump_filter *filter)
{
return -EINVAL;
}

static inline int mr_dump(struct net *net, struct notifier_block *nb,
     unsigned short family,
     int (*rules_dump)(struct net *net,
         struct notifier_block *nb,
         struct netlink_ext_ack *extack),
     struct mr_table *(*mr_iter)(struct net *net,
            struct mr_table *mrt),
     struct netlink_ext_ack *extack)
{
return -EINVAL;
}
#endif

static inline void *mr_mfc_find(struct mr_table *mrt, void *hasharg)
{
return mr_mfc_find_parent(mrt, hasharg, -1);
}

#ifdef CONFIG_PROC_FS
struct mr_vif_iter {
struct seq_net_private p;
struct mr_table *mrt;
int ct;
};

struct mr_mfc_iter {
struct seq_net_private p;
struct mr_table *mrt;
struct list_head *cache;

/* Lock protecting the mr_table's unresolved queue */
spinlock_t *lock;
};

#ifdef CONFIG_IP_MROUTE_COMMON
void *mr_vif_seq_idx(struct net *net, struct mr_vif_iter *iter, loff_t pos);
void *mr_vif_seq_next(struct seq_file *seq, void *v, loff_t *pos);

static inline void *mr_vif_seq_start(struct seq_file *seq, loff_t *pos)
{
return *pos ? mr_vif_seq_idx(seq_file_net(seq),
         seq->private, *pos - 1)
      : SEQ_START_TOKEN;
}

/* These actually return 'struct mr_mfc *', but to avoid need for explicit
* castings they simply return void.
*/
void *mr_mfc_seq_idx(struct net *net,
       struct mr_mfc_iter *it, loff_t pos);
void *mr_mfc_seq_next(struct seq_file *seq, void *v,
        loff_t *pos);

static inline void *mr_mfc_seq_start(struct seq_file *seq, loff_t *pos,
         struct mr_table *mrt, spinlock_t *lock)
{
struct mr_mfc_iter *it = seq->private;

it->mrt = mrt;
it->cache = NULL;
it->lock = lock;

return *pos ? mr_mfc_seq_idx(seq_file_net(seq),
         seq->private, *pos - 1)
      : SEQ_START_TOKEN;
}

static inline void mr_mfc_seq_stop(struct seq_file *seq, void *v)
{
struct mr_mfc_iter *it = seq->private;
struct mr_table *mrt = it->mrt;

if (it->cache == &mrt->mfc_unres_queue)
  spin_unlock_bh(it->lock);
else if (it->cache == &mrt->mfc_cache_list)
  rcu_read_unlock();
}
#else
static inline void *mr_vif_seq_idx(struct net *net, struct mr_vif_iter *iter,
       loff_t pos)
{
return NULL;
}

static inline void *mr_vif_seq_next(struct seq_file *seq,
        void *v, loff_t *pos)
{
return NULL;
}

static inline void *mr_vif_seq_start(struct seq_file *seq, loff_t *pos)
{
return NULL;
}

static inline void *mr_mfc_seq_idx(struct net *net,
       struct mr_mfc_iter *it, loff_t pos)
{
return NULL;
}

static inline void *mr_mfc_seq_next(struct seq_file *seq, void *v,
        loff_t *pos)
{
return NULL;
}

static inline void *mr_mfc_seq_start(struct seq_file *seq, loff_t *pos,
         struct mr_table *mrt, spinlock_t *lock)
{
return NULL;
}

static inline void mr_mfc_seq_stop(struct seq_file *seq, void *v)
{
}
#endif
#endif
#endif

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