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dst.h File Reference

#include <linux/config.h>
#include <net/neighbour.h>

Go to the source code of this file.

Classes

struct  dst_entry
struct  dst_ops

Defines

#define RT_CACHE_DEBUG   0
#define DST_GC_MIN   (HZ/10)
#define DST_GC_INC   (HZ/2)
#define DST_GC_MAX   (120*HZ)
#define DST_HOST   1

Functions

void dst_hold (struct dst_entry *dst)
dst_entry * dst_clone (struct dst_entry *dst)
void dst_release (struct dst_entry *dst)
void * dst_alloc (struct dst_ops *ops)
void __dst_free (struct dst_entry *dst)
void dst_destroy (struct dst_entry *dst)
void dst_free (struct dst_entry *dst)
void dst_confirm (struct dst_entry *dst)
void dst_negative_advice (struct dst_entry **dst_p)
void dst_link_failure (struct sk_buff *skb)
void dst_set_expires (struct dst_entry *dst, int timeout)
void dst_init (void)

Define Documentation

#define DST_GC_INC   (HZ/2)
 

Definition at line 22 of file dst.h.

Referenced by __dst_free(), and dst_run_gc().

#define DST_GC_MAX   (120*HZ)
 

Definition at line 23 of file dst.h.

Referenced by dst_run_gc().

#define DST_GC_MIN   (HZ/10)
 

Definition at line 21 of file dst.h.

Referenced by __dst_free().

#define DST_HOST   1
 

Definition at line 35 of file dst.h.

Referenced by ip_route_input_mc(), ip_route_input_slow(), ip_route_output_slow(), and tcp_update_metrics().

#define RT_CACHE_DEBUG   0
 

Definition at line 19 of file dst.h.

Function Documentation

void __dst_free (  struct dst_entry *  dst  ) 
 

Definition at line 120 of file dst.c.

References dst_entry::dev, dst_blackhole(), dst_discard(), dst_garbage_list, DST_GC_INC, DST_GC_MIN, dst_gc_timer, dst_gc_timer_expires, dst_gc_timer_inc, dst_lock, net_device::flags, dst_entry::input, dst_entry::next, dst_entry::obsolete, and dst_entry::output.

Referenced by dst_free().

00121 {
00122         spin_lock_bh(&dst_lock);
00123 
00124         /* The first case (dev==NULL) is required, when
00125            protocol module is unloaded.
00126          */
00127         if (dst->dev == NULL || !(dst->dev->flags&IFF_UP)) {
00128                 dst->input = dst_discard;
00129                 dst->output = dst_blackhole;
00130         }
00131         dst->obsolete = 2;
00132         dst->next = dst_garbage_list;
00133         dst_garbage_list = dst;
00134         if (dst_gc_timer_inc > DST_GC_INC) {
00135                 dst_gc_timer_inc = DST_GC_INC;
00136                 dst_gc_timer_expires = DST_GC_MIN;
00137                 mod_timer(&dst_gc_timer, jiffies + dst_gc_timer_expires);
00138         }
00139 
00140         spin_unlock_bh(&dst_lock);
00141 }

void* dst_alloc (  struct dst_ops *  ops  ) 
 

Definition at line 96 of file dst.c.

References dst_blackhole(), dst_discard(), dst_ops::entries, dst_ops::entry_size, dst_ops::gc, dst_ops::gc_thresh, and dst_ops::kmem_cachep.

Referenced by ip_route_input_mc(), ip_route_input_slow(), ip_route_output_slow(), and ip_rt_redirect().

00097 {
00098         struct dst_entry * dst;
00099 
00100         if (ops->gc && atomic_read(&ops->entries) > ops->gc_thresh) {
00101                 if (ops->gc())
00102                         return NULL;
00103         }
00104         dst = kmem_cache_alloc(ops->kmem_cachep, SLAB_ATOMIC);
00105         if (!dst)
00106                 return NULL;
00107         memset(dst, 0, ops->entry_size);
00108         atomic_set(&dst->__refcnt, 0);
00109         dst->ops = ops;
00110         dst->lastuse = jiffies;
00111         dst->input = dst_discard;
00112         dst->output = dst_blackhole;
00113 #if RT_CACHE_DEBUG >= 2 
00114         atomic_inc(&dst_total);
00115 #endif
00116         atomic_inc(&ops->entries);
00117         return dst;
00118 }

struct dst_entry* dst_clone (  struct dst_entry *  dst  )  [inline, static]
 

Definition at line 97 of file dst.h.

References dst_entry::__refcnt.

Referenced by __ip_vs_get_out_rt(), copy_skb_header(), dn_nsp_send(), ip_build_xmit(), ip_build_xmit_slow(), ip_forward_finish(), ip_fragment(), ip_queue_xmit(), ip_rt_dump(), ipmr_cache_report(), skb_clone(), tcp_make_synack(), and udp_sendmsg().

00098 {
00099         if (dst)
00100                 atomic_inc(&dst->__refcnt);
00101         return dst;
00102 }

void dst_confirm (  struct dst_entry *  dst  )  [inline, static]
 

Definition at line 127 of file dst.h.

References neigh_confirm(), and dst_entry::neighbour.

Referenced by ip_rt_frag_needed(), ip_rt_redirect(), raw_sendmsg(), tcp_ack(), tcp_init_metrics(), tcp_rcv_state_process(), tcp_update_metrics(), and udp_sendmsg().

00128 {
00129         if (dst)
00130                 neigh_confirm(dst->neighbour);
00131 }

void dst_destroy (  struct dst_entry *  dst  ) 
 

Definition at line 143 of file dst.c.

References dst_ops::destroy, dst_entry::dev, dev_put(), dst_ops::entries, dst_entry::hh, dst_ops::kmem_cachep, neigh_release(), dst_entry::neighbour, and dst_entry::ops.

Referenced by dst_free(), and dst_run_gc().

00144 {
00145         struct neighbour *neigh = dst->neighbour;
00146         struct hh_cache *hh = dst->hh;
00147 
00148         dst->hh = NULL;
00149         if (hh && atomic_dec_and_test(&hh->hh_refcnt))
00150                 kfree(hh);
00151 
00152         if (neigh) {
00153                 dst->neighbour = NULL;
00154                 neigh_release(neigh);
00155         }
00156 
00157         atomic_dec(&dst->ops->entries);
00158 
00159         if (dst->ops->destroy)
00160                 dst->ops->destroy(dst);
00161         if (dst->dev)
00162                 dev_put(dst->dev);
00163 #if RT_CACHE_DEBUG >= 2 
00164         atomic_dec(&dst_total);
00165 #endif
00166         kmem_cache_free(dst->ops->kmem_cachep, dst);
00167 }

void dst_free (  struct dst_entry *  dst  )  [inline, static]
 

Definition at line 116 of file dst.h.

References __dst_free(), dst_entry::__refcnt, dst_destroy(), and dst_entry::obsolete.

Referenced by rt_drop(), and rt_free().

00117 {
00118         if (dst->obsolete > 1)
00119                 return;
00120         if (!atomic_read(&dst->__refcnt)) {
00121                 dst_destroy(dst);
00122                 return;
00123         }
00124         __dst_free(dst);
00125 }

void dst_hold (  struct dst_entry *  dst  )  [inline, static]
 

Definition at line 91 of file dst.h.

References dst_entry::__refcnt.

Referenced by __ip_vs_dst_check(), ip_route_input(), ip_route_output_key(), ip_rt_redirect(), rt_intern_hash(), and sk_dst_get().

00092 {
00093         atomic_inc(&dst->__refcnt);
00094 }

void dst_init (  void   ) 
 

Definition at line 216 of file dst.c.

References dst_dev_notifier, and register_netdevice_notifier().

Referenced by net_dev_init().

00217 {
00218         register_netdevice_notifier(&dst_dev_notifier);
00219 }

void dst_link_failure (  struct sk_buff *  skb  )  [inline, static]
 

Definition at line 140 of file dst.h.

References sk_buff::dst, dst_ops::link_failure, and dst_entry::ops.

Referenced by arp_error_report(), ip_vs_bypass_xmit(), ip_vs_dr_xmit(), ip_vs_in_icmp(), ip_vs_nat_xmit(), ip_vs_tunnel_xmit(), ipgre_tunnel_xmit(), and ipip_tunnel_xmit().

00141 {
00142         struct dst_entry * dst = skb->dst;
00143         if (dst && dst->ops && dst->ops->link_failure)
00144                 dst->ops->link_failure(skb);
00145 }

void dst_negative_advice (  struct dst_entry **  dst_p  )  [inline, static]
 

Definition at line 133 of file dst.h.

References dst_ops::negative_advice, and dst_entry::ops.

Referenced by tcp_write_timeout().

00134 {
00135         struct dst_entry * dst = *dst_p;
00136         if (dst && dst->ops->negative_advice)
00137                 *dst_p = dst->ops->negative_advice(dst);
00138 }

void dst_release (  struct dst_entry *  dst  )  [inline, static]
 

Definition at line 105 of file dst.h.

References dst_entry::__refcnt.

Referenced by __ip_vs_dst_reset(), __ip_vs_dst_set(), __kfree_skb(), __sk_dst_reset(), __sk_dst_set(), dn_nsp_send(), inet_sock_destruct(), ip_forward_finish(), ip_getsockopt(), ip_route_me_harder(), ip_rt_dump(), ip_rt_put(), ip_vs_bypass_xmit(), ip_vs_dr_xmit(), ip_vs_in_icmp(), ip_vs_nat_xmit(), ip_vs_tunnel_xmit(), ipgre_err(), ipgre_rcv(), ipgre_tunnel_xmit(), ipip_err(), ipip_rcv(), ipip_tunnel_xmit(), ipmr_queue_xmit(), ipt_mirror_target(), ipv4_dst_check(), pneigh_enqueue(), route_mirror(), route_reverse(), send_reset(), tcp_v4_conn_request(), tcp_v4_send_synack(), and tcp_v4_syn_recv_sock().

00106 {
00107         if (dst)
00108                 atomic_dec(&dst->__refcnt);
00109 }

void dst_set_expires (  struct dst_entry *  dst,
int  timeout
)  [inline, static]
 

Definition at line 147 of file dst.h.

References dst_entry::expires.

Referenced by ip_rt_frag_needed(), ip_rt_update_pmtu(), and ipv4_link_failure().

00148 {
00149         unsigned long expires = jiffies + timeout;
00150 
00151         if (expires == 0)
00152                 expires = 1;
00153 
00154         if (dst->expires == 0 || (long)(dst->expires - expires) > 0)
00155                 dst->expires = expires;
00156 }

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