author | Florian Westphal <fw@strlen.de> |
Thu, 09 Apr 2009 12:07:21 +0200 | |
changeset 2 | d1f6d8b6f81c |
parent 0 | aa628870c1d3 |
permissions | -rw-r--r-- |
0
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Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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/* |
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Port of Linux 2.6.28 for use with network simulation cradle.
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* INETPEER - A storage for permanent information about peers |
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Port of Linux 2.6.28 for use with network simulation cradle.
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* |
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Port of Linux 2.6.28 for use with network simulation cradle.
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* This source is covered by the GNU GPL, the same as all kernel sources. |
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Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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* |
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Port of Linux 2.6.28 for use with network simulation cradle.
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* Authors: Andrey V. Savochkin <saw@msu.ru> |
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Port of Linux 2.6.28 for use with network simulation cradle.
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*/ |
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Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
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Port of Linux 2.6.28 for use with network simulation cradle.
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#include <linux/module.h> |
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Port of Linux 2.6.28 for use with network simulation cradle.
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#include <linux/types.h> |
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#include <linux/slab.h> |
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#include <linux/interrupt.h> |
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#include <linux/spinlock.h> |
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#include <linux/random.h> |
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#include <linux/timer.h> |
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#include <linux/time.h> |
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#include <linux/kernel.h> |
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#include <linux/mm.h> |
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#include <linux/net.h> |
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#include <net/ip.h> |
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#include <net/inetpeer.h> |
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|
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/* |
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* Theory of operations. |
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* We keep one entry for each peer IP address. The nodes contains long-living |
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* information about the peer which doesn't depend on routes. |
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* At this moment this information consists only of ID field for the next |
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* outgoing IP packet. This field is incremented with each packet as encoded |
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* in inet_getid() function (include/net/inetpeer.h). |
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* At the moment of writing this notes identifier of IP packets is generated |
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* to be unpredictable using this code only for packets subjected |
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* (actually or potentially) to defragmentation. I.e. DF packets less than |
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* PMTU in size uses a constant ID and do not use this code (see |
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* ip_select_ident() in include/net/ip.h). |
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* |
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* Route cache entries hold references to our nodes. |
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* New cache entries get references via lookup by destination IP address in |
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* the avl tree. The reference is grabbed only when it's needed i.e. only |
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* when we try to output IP packet which needs an unpredictable ID (see |
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* __ip_select_ident() in net/ipv4/route.c). |
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* Nodes are removed only when reference counter goes to 0. |
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* When it's happened the node may be removed when a sufficient amount of |
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* time has been passed since its last use. The less-recently-used entry can |
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* also be removed if the pool is overloaded i.e. if the total amount of |
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* entries is greater-or-equal than the threshold. |
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* |
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* Node pool is organised as an AVL tree. |
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* Such an implementation has been chosen not just for fun. It's a way to |
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* prevent easy and efficient DoS attacks by creating hash collisions. A huge |
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* amount of long living nodes in a single hash slot would significantly delay |
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* lookups performed with disabled BHs. |
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* |
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* Serialisation issues. |
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* 1. Nodes may appear in the tree only with the pool write lock held. |
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* 2. Nodes may disappear from the tree only with the pool write lock held |
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* AND reference count being 0. |
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* 3. Nodes appears and disappears from unused node list only under |
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* "inet_peer_unused_lock". |
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* 4. Global variable peer_total is modified under the pool lock. |
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* 5. struct inet_peer fields modification: |
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* avl_left, avl_right, avl_parent, avl_height: pool lock |
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* unused: unused node list lock |
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* refcnt: atomically against modifications on other CPU; |
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* usually under some other lock to prevent node disappearing |
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* dtime: unused node list lock |
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* v4daddr: unchangeable |
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* ip_id_count: idlock |
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*/ |
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|
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/* Exported for inet_getid inline function. */ |
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DEFINE_SPINLOCK(inet_peer_idlock); |
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|
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static struct kmem_cache *peer_cachep __read_mostly; |
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|
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#define node_height(x) x->avl_height |
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static struct inet_peer peer_fake_node = { |
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.avl_left = &peer_fake_node, |
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.avl_right = &peer_fake_node, |
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.avl_height = 0 |
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}; |
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#define peer_avl_empty (&peer_fake_node) |
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static struct inet_peer *peer_root = peer_avl_empty; |
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static DEFINE_RWLOCK(peer_pool_lock); |
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#define PEER_MAXDEPTH 40 /* sufficient for about 2^27 nodes */ |
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|
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static int peer_total; |
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/* Exported for sysctl_net_ipv4. */ |
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int inet_peer_threshold __read_mostly = 65536 + 128; /* start to throw entries more |
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* aggressively at this stage */ |
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int inet_peer_minttl __read_mostly = 120 * HZ; /* TTL under high load: 120 sec */ |
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int inet_peer_maxttl __read_mostly = 10 * 60 * HZ; /* usual time to live: 10 min */ |
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int inet_peer_gc_mintime __read_mostly = 10 * HZ; |
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int inet_peer_gc_maxtime __read_mostly = 120 * HZ; |
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static LIST_HEAD(unused_peers); |
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static DEFINE_SPINLOCK(inet_peer_unused_lock); |
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static void peer_check_expire(unsigned long dummy); |
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static DEFINE_TIMER(peer_periodic_timer, peer_check_expire, 0, 0); |
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|
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|
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/* Called from ip_output.c:ip_init */ |
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void __init inet_initpeers(void) |
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{ |
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struct sysinfo si; |
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|
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/* Use the straight interface to information about memory. */ |
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si_meminfo(&si); |
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/* The values below were suggested by Alexey Kuznetsov |
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110 |
* <kuznet@ms2.inr.ac.ru>. I don't have any opinion about the values |
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111 |
* myself. --SAW |
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112 |
*/ |
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113 |
if (si.totalram <= (32768*1024)/PAGE_SIZE) |
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114 |
inet_peer_threshold >>= 1; /* max pool size about 1MB on IA32 */ |
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115 |
if (si.totalram <= (16384*1024)/PAGE_SIZE) |
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116 |
inet_peer_threshold >>= 1; /* about 512KB */ |
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117 |
if (si.totalram <= (8192*1024)/PAGE_SIZE) |
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118 |
inet_peer_threshold >>= 2; /* about 128KB */ |
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119 |
|
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120 |
peer_cachep = kmem_cache_create("inet_peer_cache", |
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121 |
sizeof(struct inet_peer), |
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122 |
0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, |
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123 |
NULL); |
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124 |
|
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125 |
/* All the timers, started at system startup tend |
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126 |
to synchronize. Perturb it a bit. |
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127 |
*/ |
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128 |
peer_periodic_timer.expires = jiffies |
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129 |
+ net_random() % inet_peer_gc_maxtime |
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130 |
+ inet_peer_gc_maxtime; |
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131 |
add_timer(&peer_periodic_timer); |
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132 |
} |
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133 |
|
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134 |
/* Called with or without local BH being disabled. */ |
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135 |
static void unlink_from_unused(struct inet_peer *p) |
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136 |
{ |
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137 |
spin_lock_bh(&inet_peer_unused_lock); |
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138 |
list_del_init(&p->unused); |
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139 |
spin_unlock_bh(&inet_peer_unused_lock); |
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140 |
} |
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141 |
|
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142 |
/* |
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143 |
* Called with local BH disabled and the pool lock held. |
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144 |
* _stack is known to be NULL or not at compile time, |
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|
145 |
* so compiler will optimize the if (_stack) tests. |
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parents:
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|
146 |
*/ |
2 | 147 |
#define lookup(_daddr, _stack) \ |
0
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148 |
({ \ |
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149 |
struct inet_peer *u, **v; \ |
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|
150 |
if (_stack != NULL) { \ |
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151 |
stackptr = _stack; \ |
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152 |
*stackptr++ = &peer_root; \ |
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153 |
} \ |
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154 |
for (u = peer_root; u != peer_avl_empty; ) { \ |
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155 |
if (_daddr == u->v4daddr) \ |
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|
156 |
break; \ |
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parents:
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|
157 |
if ((__force __u32)_daddr < (__force __u32)u->v4daddr) \ |
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|
158 |
v = &u->avl_left; \ |
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|
159 |
else \ |
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160 |
v = &u->avl_right; \ |
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|
161 |
if (_stack != NULL) \ |
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|
162 |
*stackptr++ = v; \ |
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parents:
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|
163 |
u = *v; \ |
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parents:
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|
164 |
} \ |
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|
165 |
u; \ |
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Port of Linux 2.6.28 for use with network simulation cradle.
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|
166 |
}) |
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Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
167 |
|
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|
168 |
/* Called with local BH disabled and the pool write lock held. */ |
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parents:
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|
169 |
#define lookup_rightempty(start) \ |
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170 |
({ \ |
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|
171 |
struct inet_peer *u, **v; \ |
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|
172 |
*stackptr++ = &start->avl_left; \ |
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|
173 |
v = &start->avl_left; \ |
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parents:
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|
174 |
for (u = *v; u->avl_right != peer_avl_empty; ) { \ |
aa628870c1d3
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parents:
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|
175 |
v = &u->avl_right; \ |
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parents:
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|
176 |
*stackptr++ = v; \ |
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|
177 |
u = *v; \ |
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parents:
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|
178 |
} \ |
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|
179 |
u; \ |
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Port of Linux 2.6.28 for use with network simulation cradle.
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|
180 |
}) |
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Port of Linux 2.6.28 for use with network simulation cradle.
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|
181 |
|
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|
182 |
/* Called with local BH disabled and the pool write lock held. |
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Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
183 |
* Variable names are the proof of operation correctness. |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
184 |
* Look into mm/map_avl.c for more detail description of the ideas. */ |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
185 |
static void peer_avl_rebalance(struct inet_peer **stack[], |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
186 |
struct inet_peer ***stackend) |
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Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
187 |
{ |
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Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
188 |
struct inet_peer **nodep, *node, *l, *r; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
189 |
int lh, rh; |
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|
190 |
|
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parents:
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|
191 |
while (stackend > stack) { |
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Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
192 |
nodep = *--stackend; |
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Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
193 |
node = *nodep; |
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Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
194 |
l = node->avl_left; |
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parents:
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|
195 |
r = node->avl_right; |
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Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
196 |
lh = node_height(l); |
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|
197 |
rh = node_height(r); |
aa628870c1d3
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parents:
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|
198 |
if (lh > rh + 1) { /* l: RH+2 */ |
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|
199 |
struct inet_peer *ll, *lr, *lrl, *lrr; |
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parents:
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|
200 |
int lrh; |
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parents:
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|
201 |
ll = l->avl_left; |
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parents:
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|
202 |
lr = l->avl_right; |
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Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
203 |
lrh = node_height(lr); |
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Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
204 |
if (lrh <= node_height(ll)) { /* ll: RH+1 */ |
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parents:
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|
205 |
node->avl_left = lr; /* lr: RH or RH+1 */ |
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Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
206 |
node->avl_right = r; /* r: RH */ |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
207 |
node->avl_height = lrh + 1; /* RH+1 or RH+2 */ |
aa628870c1d3
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parents:
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|
208 |
l->avl_left = ll; /* ll: RH+1 */ |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
209 |
l->avl_right = node; /* node: RH+1 or RH+2 */ |
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Port of Linux 2.6.28 for use with network simulation cradle.
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|
210 |
l->avl_height = node->avl_height + 1; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
211 |
*nodep = l; |
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Port of Linux 2.6.28 for use with network simulation cradle.
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|
212 |
} else { /* ll: RH, lr: RH+1 */ |
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Port of Linux 2.6.28 for use with network simulation cradle.
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|
213 |
lrl = lr->avl_left; /* lrl: RH or RH-1 */ |
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|
214 |
lrr = lr->avl_right; /* lrr: RH or RH-1 */ |
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Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
215 |
node->avl_left = lrr; /* lrr: RH or RH-1 */ |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
216 |
node->avl_right = r; /* r: RH */ |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
diff
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|
217 |
node->avl_height = rh + 1; /* node: RH+1 */ |
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Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
218 |
l->avl_left = ll; /* ll: RH */ |
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Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
219 |
l->avl_right = lrl; /* lrl: RH or RH-1 */ |
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Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
220 |
l->avl_height = rh + 1; /* l: RH+1 */ |
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Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
221 |
lr->avl_left = l; /* l: RH+1 */ |
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Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
222 |
lr->avl_right = node; /* node: RH+1 */ |
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|
223 |
lr->avl_height = rh + 2; |
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|
224 |
*nodep = lr; |
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|
225 |
} |
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|
226 |
} else if (rh > lh + 1) { /* r: LH+2 */ |
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|
227 |
struct inet_peer *rr, *rl, *rlr, *rll; |
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|
228 |
int rlh; |
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|
229 |
rr = r->avl_right; |
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|
230 |
rl = r->avl_left; |
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|
231 |
rlh = node_height(rl); |
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|
232 |
if (rlh <= node_height(rr)) { /* rr: LH+1 */ |
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|
233 |
node->avl_right = rl; /* rl: LH or LH+1 */ |
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|
234 |
node->avl_left = l; /* l: LH */ |
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|
235 |
node->avl_height = rlh + 1; /* LH+1 or LH+2 */ |
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|
236 |
r->avl_right = rr; /* rr: LH+1 */ |
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|
237 |
r->avl_left = node; /* node: LH+1 or LH+2 */ |
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|
238 |
r->avl_height = node->avl_height + 1; |
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parents:
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|
239 |
*nodep = r; |
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|
240 |
} else { /* rr: RH, rl: RH+1 */ |
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|
241 |
rlr = rl->avl_right; /* rlr: LH or LH-1 */ |
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|
242 |
rll = rl->avl_left; /* rll: LH or LH-1 */ |
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|
243 |
node->avl_right = rll; /* rll: LH or LH-1 */ |
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|
244 |
node->avl_left = l; /* l: LH */ |
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|
245 |
node->avl_height = lh + 1; /* node: LH+1 */ |
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|
246 |
r->avl_right = rr; /* rr: LH */ |
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|
247 |
r->avl_left = rlr; /* rlr: LH or LH-1 */ |
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|
248 |
r->avl_height = lh + 1; /* r: LH+1 */ |
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|
249 |
rl->avl_right = r; /* r: LH+1 */ |
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parents:
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|
250 |
rl->avl_left = node; /* node: LH+1 */ |
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|
251 |
rl->avl_height = lh + 2; |
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|
252 |
*nodep = rl; |
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|
253 |
} |
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|
254 |
} else { |
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|
255 |
node->avl_height = (lh > rh ? lh : rh) + 1; |
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|
256 |
} |
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|
257 |
} |
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|
258 |
} |
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|
259 |
|
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|
260 |
/* Called with local BH disabled and the pool write lock held. */ |
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Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
261 |
#define link_to_pool(n) \ |
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parents:
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|
262 |
do { \ |
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Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
263 |
n->avl_height = 1; \ |
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Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
264 |
n->avl_left = peer_avl_empty; \ |
aa628870c1d3
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parents:
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|
265 |
n->avl_right = peer_avl_empty; \ |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
266 |
**--stackptr = n; \ |
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Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
267 |
peer_avl_rebalance(stack, stackptr); \ |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
diff
changeset
|
268 |
} while(0) |
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parents:
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|
269 |
|
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Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
270 |
/* May be called with local BH enabled. */ |
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Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
271 |
static void unlink_from_pool(struct inet_peer *p) |
aa628870c1d3
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parents:
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|
272 |
{ |
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parents:
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|
273 |
int do_free; |
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parents:
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changeset
|
274 |
|
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Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
275 |
do_free = 0; |
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Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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changeset
|
276 |
|
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Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
277 |
write_lock_bh(&peer_pool_lock); |
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Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
diff
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|
278 |
/* Check the reference counter. It was artificially incremented by 1 |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
diff
changeset
|
279 |
* in cleanup() function to prevent sudden disappearing. If the |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
diff
changeset
|
280 |
* reference count is still 1 then the node is referenced only as `p' |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
diff
changeset
|
281 |
* here and from the pool. So under the exclusive pool lock it's safe |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
diff
changeset
|
282 |
* to remove the node and free it later. */ |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
diff
changeset
|
283 |
if (atomic_read(&p->refcnt) == 1) { |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
diff
changeset
|
284 |
struct inet_peer **stack[PEER_MAXDEPTH]; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
285 |
struct inet_peer ***stackptr, ***delp; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
286 |
if (lookup(p->v4daddr, stack) != p) |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
diff
changeset
|
287 |
BUG(); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
288 |
delp = stackptr - 1; /* *delp[0] == p */ |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
289 |
if (p->avl_left == peer_avl_empty) { |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
290 |
*delp[0] = p->avl_right; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
diff
changeset
|
291 |
--stackptr; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
diff
changeset
|
292 |
} else { |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
293 |
/* look for a node to insert instead of p */ |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
294 |
struct inet_peer *t; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
295 |
t = lookup_rightempty(p); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
296 |
BUG_ON(*stackptr[-1] != t); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
297 |
**--stackptr = t->avl_left; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
diff
changeset
|
298 |
/* t is removed, t->v4daddr > x->v4daddr for any |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
299 |
* x in p->avl_left subtree. |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
300 |
* Put t in the old place of p. */ |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
301 |
*delp[0] = t; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
diff
changeset
|
302 |
t->avl_left = p->avl_left; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
303 |
t->avl_right = p->avl_right; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
304 |
t->avl_height = p->avl_height; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
305 |
BUG_ON(delp[1] != &p->avl_left); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
306 |
delp[1] = &t->avl_left; /* was &p->avl_left */ |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
307 |
} |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
308 |
peer_avl_rebalance(stack, stackptr); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
309 |
peer_total--; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
310 |
do_free = 1; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
311 |
} |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
312 |
write_unlock_bh(&peer_pool_lock); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
diff
changeset
|
313 |
|
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
314 |
if (do_free) |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
315 |
kmem_cache_free(peer_cachep, p); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
316 |
else |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
317 |
/* The node is used again. Decrease the reference counter |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
318 |
* back. The loop "cleanup -> unlink_from_unused |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
319 |
* -> unlink_from_pool -> putpeer -> link_to_unused |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
320 |
* -> cleanup (for the same node)" |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
321 |
* doesn't really exist because the entry will have a |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
322 |
* recent deletion time and will not be cleaned again soon. */ |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
323 |
inet_putpeer(p); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
324 |
} |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
325 |
|
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
326 |
/* May be called with local BH enabled. */ |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
327 |
static int cleanup_once(unsigned long ttl) |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
328 |
{ |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
329 |
struct inet_peer *p = NULL; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
330 |
|
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
331 |
/* Remove the first entry from the list of unused nodes. */ |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
332 |
spin_lock_bh(&inet_peer_unused_lock); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
333 |
if (!list_empty(&unused_peers)) { |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
334 |
__u32 delta; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
335 |
|
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
336 |
p = list_first_entry(&unused_peers, struct inet_peer, unused); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
337 |
delta = (__u32)jiffies - p->dtime; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
338 |
|
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
339 |
if (delta < ttl) { |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
340 |
/* Do not prune fresh entries. */ |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
341 |
spin_unlock_bh(&inet_peer_unused_lock); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
342 |
return -1; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
343 |
} |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
344 |
|
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
345 |
list_del_init(&p->unused); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
346 |
|
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
347 |
/* Grab an extra reference to prevent node disappearing |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
348 |
* before unlink_from_pool() call. */ |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
349 |
atomic_inc(&p->refcnt); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
350 |
} |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
351 |
spin_unlock_bh(&inet_peer_unused_lock); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
352 |
|
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
353 |
if (p == NULL) |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
354 |
/* It means that the total number of USED entries has |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
355 |
* grown over inet_peer_threshold. It shouldn't really |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
356 |
* happen because of entry limits in route cache. */ |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
357 |
return -1; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
358 |
|
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
359 |
unlink_from_pool(p); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
360 |
return 0; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
361 |
} |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
362 |
|
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
363 |
/* Called with or without local BH being disabled. */ |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
364 |
struct inet_peer *inet_getpeer(__be32 daddr, int create) |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
365 |
{ |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
366 |
struct inet_peer *p, *n; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
367 |
struct inet_peer **stack[PEER_MAXDEPTH], ***stackptr; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
368 |
|
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
369 |
/* Look up for the address quickly. */ |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
370 |
read_lock_bh(&peer_pool_lock); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
371 |
p = lookup(daddr, NULL); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
372 |
if (p != peer_avl_empty) |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
373 |
atomic_inc(&p->refcnt); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
374 |
read_unlock_bh(&peer_pool_lock); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
375 |
|
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
376 |
if (p != peer_avl_empty) { |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
377 |
/* The existing node has been found. */ |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
378 |
/* Remove the entry from unused list if it was there. */ |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
379 |
unlink_from_unused(p); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
380 |
return p; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
381 |
} |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
382 |
|
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
383 |
if (!create) |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
384 |
return NULL; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
385 |
|
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
386 |
/* Allocate the space outside the locked region. */ |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
387 |
n = kmem_cache_alloc(peer_cachep, GFP_ATOMIC); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
388 |
if (n == NULL) |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
389 |
return NULL; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
390 |
n->v4daddr = daddr; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
391 |
atomic_set(&n->refcnt, 1); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
392 |
atomic_set(&n->rid, 0); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
393 |
n->ip_id_count = secure_ip_id(daddr); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
394 |
n->tcp_ts_stamp = 0; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
395 |
|
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
396 |
write_lock_bh(&peer_pool_lock); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
397 |
/* Check if an entry has suddenly appeared. */ |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
398 |
p = lookup(daddr, stack); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
399 |
if (p != peer_avl_empty) |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
400 |
goto out_free; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
401 |
|
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
402 |
/* Link the node. */ |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
403 |
link_to_pool(n); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
404 |
INIT_LIST_HEAD(&n->unused); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
405 |
peer_total++; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
406 |
write_unlock_bh(&peer_pool_lock); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
407 |
|
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
408 |
if (peer_total >= inet_peer_threshold) |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
409 |
/* Remove one less-recently-used entry. */ |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
410 |
cleanup_once(0); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
411 |
|
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
412 |
return n; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
413 |
|
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
414 |
out_free: |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
415 |
/* The appropriate node is already in the pool. */ |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
416 |
atomic_inc(&p->refcnt); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
417 |
write_unlock_bh(&peer_pool_lock); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
418 |
/* Remove the entry from unused list if it was there. */ |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
419 |
unlink_from_unused(p); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
420 |
/* Free preallocated the preallocated node. */ |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
421 |
kmem_cache_free(peer_cachep, n); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
422 |
return p; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
423 |
} |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
424 |
|
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
425 |
/* Called with local BH disabled. */ |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
426 |
static void peer_check_expire(unsigned long dummy) |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
427 |
{ |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
428 |
unsigned long now = jiffies; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
429 |
int ttl; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
430 |
|
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
431 |
if (peer_total >= inet_peer_threshold) |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
432 |
ttl = inet_peer_minttl; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
433 |
else |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
434 |
ttl = inet_peer_maxttl |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
435 |
- (inet_peer_maxttl - inet_peer_minttl) / HZ * |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
436 |
peer_total / inet_peer_threshold * HZ; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
437 |
while (!cleanup_once(ttl)) { |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
438 |
if (jiffies != now) |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
439 |
break; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
440 |
} |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
441 |
|
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
442 |
/* Trigger the timer after inet_peer_gc_mintime .. inet_peer_gc_maxtime |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
443 |
* interval depending on the total number of entries (more entries, |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
444 |
* less interval). */ |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
445 |
if (peer_total >= inet_peer_threshold) |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
446 |
peer_periodic_timer.expires = jiffies + inet_peer_gc_mintime; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
447 |
else |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
448 |
peer_periodic_timer.expires = jiffies |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
449 |
+ inet_peer_gc_maxtime |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
450 |
- (inet_peer_gc_maxtime - inet_peer_gc_mintime) / HZ * |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
451 |
peer_total / inet_peer_threshold * HZ; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
452 |
add_timer(&peer_periodic_timer); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
453 |
} |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
454 |
|
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
455 |
void inet_putpeer(struct inet_peer *p) |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
456 |
{ |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
457 |
spin_lock_bh(&inet_peer_unused_lock); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
458 |
if (atomic_dec_and_test(&p->refcnt)) { |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
459 |
list_add_tail(&p->unused, &unused_peers); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
460 |
p->dtime = (__u32)jiffies; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
461 |
} |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
462 |
spin_unlock_bh(&inet_peer_unused_lock); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
463 |
} |