1 /* net/atm/ipcommon.c - Common items for all ways of doing IP over ATM */
2
3 /* Written 1996-2000 by Werner Almesberger, EPFL LRC/ICA */
4
5
6 #include <linux/module.h>
7 #include <linux/string.h>
8 #include <linux/skbuff.h>
9 #include <linux/netdevice.h>
10 #include <linux/in.h>
11 #include <linux/atmdev.h>
12 #include <linux/atmclip.h>
13
14 #include "common.h"
15 #include "ipcommon.h"
16
17
18 #if 0
19 #define DPRINTK(format,args...) printk(KERN_DEBUG format,##args)
20 #else
21 #define DPRINTK(format,args...)
22 #endif
23
24
25 const unsigned char llc_oui[] = {
26 0xaa, /* DSAP: non-ISO */
27 0xaa, /* SSAP: non-ISO */
28 0x03, /* Ctrl: Unnumbered Information Command PDU */
29 0x00, /* OUI: EtherType */
30 0x00,
31 0x00 };
32
33
34 /*
35 * skb_migrate appends the list at "from" to "to", emptying "from" in the
36 * process. skb_migrate is atomic with respect to all other skb operations on
37 * "from" and "to". Note that it locks both lists at the same time, so beware
38 * of potential deadlocks.
39 *
40 * This function should live in skbuff.c or skbuff.h.
41 */
42
43
skb_migrate(struct sk_buff_head * from,struct sk_buff_head * to)44 void skb_migrate(struct sk_buff_head *from,struct sk_buff_head *to)
45 {
46 struct sk_buff *skb;
47 unsigned long flags;
48 struct sk_buff *skb_from = (struct sk_buff *) from;
49 struct sk_buff *skb_to = (struct sk_buff *) to;
50 struct sk_buff *prev;
51
52 spin_lock_irqsave(&from->lock,flags);
53 spin_lock(&to->lock);
54 prev = from->prev;
55 from->next->prev = to->prev;
56 prev->next = skb_to;
57 to->prev->next = from->next;
58 to->prev = from->prev;
59 for (skb = from->next; skb != skb_to; skb = skb->next)
60 skb->list = to;
61 to->qlen += from->qlen;
62 spin_unlock(&to->lock);
63 from->prev = skb_from;
64 from->next = skb_from;
65 from->qlen = 0;
66 spin_unlock_irqrestore(&from->lock,flags);
67 }
68
69
70 EXPORT_SYMBOL(llc_oui);
71 EXPORT_SYMBOL(skb_migrate);
72