Import of Linux 2.2.12 subset (ipv4 stack and related)

1 files changed, 385 insertions, 0 deletions

diff --git a/pfinet/linux-src/net/core/skbuff.c b/pfinet/linux-src/net/core/skbuff.c
new file mode 100644
index 00000000..b7636437
--- /dev/null
+++ b/pfinet/linux-src/net/core/skbuff.c
@@ -0,0 +1,385 @@
+/*
+ *	Routines having to do with the 'struct sk_buff' memory handlers.
+ *
+ *	Authors:	Alan Cox <iiitac@pyr.swan.ac.uk>
+ *			Florian La Roche <rzsfl@rz.uni-sb.de>
+ *
+ *	Version:	$Id: skbuff.c,v 1.55 1999/02/23 08:12:27 davem Exp $
+ *
+ *	Fixes:	
+ *		Alan Cox	:	Fixed the worst of the load balancer bugs.
+ *		Dave Platt	:	Interrupt stacking fix.
+ *	Richard Kooijman	:	Timestamp fixes.
+ *		Alan Cox	:	Changed buffer format.
+ *		Alan Cox	:	destructor hook for AF_UNIX etc.
+ *		Linus Torvalds	:	Better skb_clone.
+ *		Alan Cox	:	Added skb_copy.
+ *		Alan Cox	:	Added all the changed routines Linus
+ *					only put in the headers
+ *		Ray VanTassle	:	Fixed --skb->lock in free
+ *		Alan Cox	:	skb_copy copy arp field
+ *		Andi Kleen	:	slabified it.
+ *
+ *	NOTE:
+ *		The __skb_ routines should be called with interrupts 
+ *	disabled, or you better be *real* sure that the operation is atomic 
+ *	with respect to whatever list is being frobbed (e.g. via lock_sock()
+ *	or via disabling bottom half handlers, etc).
+ *
+ *	This program is free software; you can redistribute it and/or
+ *	modify it under the terms of the GNU General Public License
+ *	as published by the Free Software Foundation; either version
+ *	2 of the License, or (at your option) any later version.
+ */
+
+/*
+ *	The functions in this file will not compile correctly with gcc 2.4.x
+ */
+
+#include <linux/config.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/mm.h>
+#include <linux/interrupt.h>
+#include <linux/in.h>
+#include <linux/inet.h>
+#include <linux/malloc.h>
+#include <linux/netdevice.h>
+#include <linux/string.h>
+#include <linux/skbuff.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+
+#include <net/ip.h>
+#include <net/protocol.h>
+#include <net/dst.h>
+#include <net/tcp.h>
+#include <net/udp.h>
+#include <net/sock.h>
+
+#include <asm/uaccess.h>
+#include <asm/system.h>
+
+/*
+ * Skb list spinlock
+ */
+spinlock_t skb_queue_lock = SPIN_LOCK_UNLOCKED;
+
+/*
+ *	Resource tracking variables
+ */
+
+static atomic_t net_skbcount = ATOMIC_INIT(0);
+static atomic_t net_allocs = ATOMIC_INIT(0);
+static atomic_t net_fails  = ATOMIC_INIT(0);
+
+extern atomic_t ip_frag_mem;
+
+static kmem_cache_t *skbuff_head_cache;
+
+/*
+ *	Keep out-of-line to prevent kernel bloat.
+ *	__builtin_return_address is not used because it is not always
+ *	reliable. 
+ */
+
+void skb_over_panic(struct sk_buff *skb, int sz, void *here)
+{
+	panic("skput:over: %p:%d put:%d dev:%s", 
+		here, skb->len, sz, skb->dev ? skb->dev->name : "<NULL>");
+}
+
+void skb_under_panic(struct sk_buff *skb, int sz, void *here)
+{
+        panic("skput:under: %p:%d put:%d dev:%s",
+                here, skb->len, sz, skb->dev ? skb->dev->name : "<NULL>");
+}
+
+void show_net_buffers(void)
+{
+	printk("Networking buffers in use          : %u\n",
+	       atomic_read(&net_skbcount));
+	printk("Total network buffer allocations   : %u\n",
+	       atomic_read(&net_allocs));
+	printk("Total failed network buffer allocs : %u\n",
+	       atomic_read(&net_fails));
+#ifdef CONFIG_INET
+	printk("IP fragment buffer size            : %u\n",
+	       atomic_read(&ip_frag_mem));
+#endif	
+}
+
+/* 	Allocate a new skbuff. We do this ourselves so we can fill in a few
+ *	'private' fields and also do memory statistics to find all the
+ *	[BEEP] leaks.
+ * 
+ */
+
+struct sk_buff *alloc_skb(unsigned int size,int gfp_mask)
+{
+	struct sk_buff *skb;
+	u8 *data;
+
+	if (in_interrupt() && (gfp_mask & __GFP_WAIT)) {
+		static int count = 0;
+		if (++count < 5) {
+			printk(KERN_ERR "alloc_skb called nonatomically "
+			       "from interrupt %p\n", __builtin_return_address(0));
+		}
+		gfp_mask &= ~__GFP_WAIT;
+	}
+
+	/* Get the HEAD */
+	skb = kmem_cache_alloc(skbuff_head_cache, gfp_mask);
+	if (skb == NULL) 
+		goto nohead;
+
+	/* Get the DATA. Size must match skb_add_mtu(). */
+	size = ((size + 15) & ~15); 
+	data = kmalloc(size + sizeof(atomic_t), gfp_mask);
+	if (data == NULL)
+		goto nodata;
+
+	/* Note that this counter is useless now - you can just look in the
+	 * skbuff_head entry in /proc/slabinfo. We keep it only for emergency
+	 * cases.
+	 */
+	atomic_inc(&net_allocs);
+
+	skb->truesize = size;
+
+	atomic_inc(&net_skbcount);
+
+	/* Load the data pointers. */
+	skb->head = data;
+	skb->data = data;
+	skb->tail = data;
+	skb->end = data + size;
+
+	/* Set up other state */
+	skb->len = 0;
+	skb->is_clone = 0;
+	skb->cloned = 0;
+
+	atomic_set(&skb->users, 1); 
+	atomic_set(skb_datarefp(skb), 1);
+	return skb;
+
+nodata:
+	kmem_cache_free(skbuff_head_cache, skb);
+nohead:
+	atomic_inc(&net_fails);
+	return NULL;
+}
+
+
+/*
+ *	Slab constructor for a skb head. 
+ */ 
+static inline void skb_headerinit(void *p, kmem_cache_t *cache, 
+				  unsigned long flags)
+{
+	struct sk_buff *skb = p;
+
+	skb->destructor = NULL;
+	skb->pkt_type = PACKET_HOST;	/* Default type */
+	skb->pkt_bridged = 0;		/* Not bridged */
+	skb->prev = skb->next = NULL;
+	skb->list = NULL;
+	skb->sk = NULL;
+	skb->stamp.tv_sec=0;	/* No idea about time */
+	skb->ip_summed = 0;
+	skb->security = 0;	/* By default packets are insecure */
+	skb->dst = NULL;
+#ifdef CONFIG_IP_FIREWALL
+        skb->fwmark = 0;
+#endif
+	memset(skb->cb, 0, sizeof(skb->cb));
+	skb->priority = 0;
+}
+
+/*
+ *	Free an skbuff by memory without cleaning the state. 
+ */
+void kfree_skbmem(struct sk_buff *skb)
+{
+	if (!skb->cloned || atomic_dec_and_test(skb_datarefp(skb)))  
+		kfree(skb->head);
+
+	kmem_cache_free(skbuff_head_cache, skb);
+	atomic_dec(&net_skbcount);
+}
+
+/*
+ *	Free an sk_buff. Release anything attached to the buffer. Clean the state.
+ */
+
+void __kfree_skb(struct sk_buff *skb)
+{
+	if (skb->list)
+	 	printk(KERN_WARNING "Warning: kfree_skb passed an skb still "
+		       "on a list (from %p).\n", __builtin_return_address(0));
+
+	dst_release(skb->dst);
+	if(skb->destructor)
+		skb->destructor(skb);
+	skb_headerinit(skb, NULL, 0);  /* clean state */
+	kfree_skbmem(skb);
+}
+
+/*
+ *	Duplicate an sk_buff. The new one is not owned by a socket.
+ */
+
+struct sk_buff *skb_clone(struct sk_buff *skb, int gfp_mask)
+{
+	struct sk_buff *n;
+	
+	n = kmem_cache_alloc(skbuff_head_cache, gfp_mask);
+	if (!n)
+		return NULL;
+
+	memcpy(n, skb, sizeof(*n));
+	atomic_inc(skb_datarefp(skb));
+	skb->cloned = 1;
+       
+	atomic_inc(&net_allocs);
+	atomic_inc(&net_skbcount);
+	dst_clone(n->dst);
+	n->cloned = 1;
+	n->next = n->prev = NULL;
+	n->list = NULL;
+	n->sk = NULL;
+	n->is_clone = 1;
+	atomic_set(&n->users, 1);
+	n->destructor = NULL;
+	return n;
+}
+
+/*
+ *	This is slower, and copies the whole data area 
+ */
+ 
+struct sk_buff *skb_copy(struct sk_buff *skb, int gfp_mask)
+{
+	struct sk_buff *n;
+	unsigned long offset;
+
+	/*
+	 *	Allocate the copy buffer
+	 */
+	 
+	n=alloc_skb(skb->end - skb->head, gfp_mask);
+	if(n==NULL)
+		return NULL;
+
+	/*
+	 *	Shift between the two data areas in bytes
+	 */
+	 
+	offset=n->head-skb->head;
+
+	/* Set the data pointer */
+	skb_reserve(n,skb->data-skb->head);
+	/* Set the tail pointer and length */
+	skb_put(n,skb->len);
+	/* Copy the bytes */
+	memcpy(n->head,skb->head,skb->end-skb->head);
+	n->csum = skb->csum;
+	n->list=NULL;
+	n->sk=NULL;
+	n->dev=skb->dev;
+	n->priority=skb->priority;
+	n->protocol=skb->protocol;
+	n->dst=dst_clone(skb->dst);
+	n->h.raw=skb->h.raw+offset;
+	n->nh.raw=skb->nh.raw+offset;
+	n->mac.raw=skb->mac.raw+offset;
+	memcpy(n->cb, skb->cb, sizeof(skb->cb));
+	n->used=skb->used;
+	n->is_clone=0;
+	atomic_set(&n->users, 1);
+	n->pkt_type=skb->pkt_type;
+	n->stamp=skb->stamp;
+	n->destructor = NULL;
+	n->security=skb->security;
+#ifdef CONFIG_IP_FIREWALL
+        n->fwmark = skb->fwmark;
+#endif
+	return n;
+}
+
+struct sk_buff *skb_realloc_headroom(struct sk_buff *skb, int newheadroom)
+{
+	struct sk_buff *n;
+	unsigned long offset;
+	int headroom = skb_headroom(skb);
+
+	/*
+	 *	Allocate the copy buffer
+	 */
+ 	 
+	n=alloc_skb(skb->truesize+newheadroom-headroom, GFP_ATOMIC);
+	if(n==NULL)
+		return NULL;
+
+	skb_reserve(n,newheadroom);
+
+	/*
+	 *	Shift between the two data areas in bytes
+	 */
+	 
+	offset=n->data-skb->data;
+
+	/* Set the tail pointer and length */
+	skb_put(n,skb->len);
+	/* Copy the bytes */
+	memcpy(n->data,skb->data,skb->len);
+	n->list=NULL;
+	n->sk=NULL;
+	n->priority=skb->priority;
+	n->protocol=skb->protocol;
+	n->dev=skb->dev;
+	n->dst=dst_clone(skb->dst);
+	n->h.raw=skb->h.raw+offset;
+	n->nh.raw=skb->nh.raw+offset;
+	n->mac.raw=skb->mac.raw+offset;
+	memcpy(n->cb, skb->cb, sizeof(skb->cb));
+	n->used=skb->used;
+	n->is_clone=0;
+	atomic_set(&n->users, 1);
+	n->pkt_type=skb->pkt_type;
+	n->stamp=skb->stamp;
+	n->destructor = NULL;
+	n->security=skb->security;
+#ifdef CONFIG_IP_FIREWALL
+        n->fwmark = skb->fwmark;
+#endif
+
+	return n;
+}
+
+#if 0
+/* 
+ * 	Tune the memory allocator for a new MTU size.
+ */
+void skb_add_mtu(int mtu)
+{
+	/* Must match allocation in alloc_skb */
+	mtu = ((mtu + 15) & ~15) + sizeof(atomic_t);
+
+	kmem_add_cache_size(mtu);
+}
+#endif
+
+void __init skb_init(void)
+{
+	skbuff_head_cache = kmem_cache_create("skbuff_head_cache",
+					      sizeof(struct sk_buff),
+					      0,
+					      SLAB_HWCACHE_ALIGN,
+					      skb_headerinit, NULL);
+	if (!skbuff_head_cache)
+		panic("cannot create skbuff cache");
+}