ipcommon.c
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上传日期:2013-02-24
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- /* net/atm/ipcommon.c - Common items for all ways of doing IP over ATM */
- /* Written 1996-2000 by Werner Almesberger, EPFL LRC/ICA */
- #include <linux/module.h>
- #include <linux/string.h>
- #include <linux/skbuff.h>
- #include <linux/netdevice.h>
- #include <linux/in.h>
- #include <linux/atmdev.h>
- #include <linux/atmclip.h>
- #include "common.h"
- #include "ipcommon.h"
- #if 0
- #define DPRINTK(format,args...) printk(KERN_DEBUG format,##args)
- #else
- #define DPRINTK(format,args...)
- #endif
- const unsigned char llc_oui[] = {
- 0xaa, /* DSAP: non-ISO */
- 0xaa, /* SSAP: non-ISO */
- 0x03, /* Ctrl: Unnumbered Information Command PDU */
- 0x00, /* OUI: EtherType */
- 0x00,
- 0x00 };
- /*
- * skb_migrate appends the list at "from" to "to", emptying "from" in the
- * process. skb_migrate is atomic with respect to all other skb operations on
- * "from" and "to". Note that it locks both lists at the same time, so beware
- * of potential deadlocks.
- *
- * This function should live in skbuff.c or skbuff.h.
- */
- void skb_migrate(struct sk_buff_head *from,struct sk_buff_head *to)
- {
- struct sk_buff *skb;
- unsigned long flags;
- struct sk_buff *skb_from = (struct sk_buff *) from;
- struct sk_buff *skb_to = (struct sk_buff *) to;
- struct sk_buff *prev;
- spin_lock_irqsave(&from->lock,flags);
- spin_lock(&to->lock);
- prev = from->prev;
- from->next->prev = to->prev;
- prev->next = skb_to;
- to->prev->next = from->next;
- to->prev = from->prev;
- for (skb = from->next; skb != skb_to; skb = skb->next)
- skb->list = to;
- to->qlen += from->qlen;
- spin_unlock(&to->lock);
- from->prev = skb_from;
- from->next = skb_from;
- from->qlen = 0;
- spin_unlock_irqrestore(&from->lock,flags);
- }
- EXPORT_SYMBOL(skb_migrate);