This source file includes following definitions.
- loopback_xmit
- get_stats
- loopback_open
- loopback_init
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26 #include <linux/config.h>
27 #include <linux/kernel.h>
28 #include <linux/sched.h>
29 #include <linux/interrupt.h>
30 #include <linux/fs.h>
31 #include <linux/types.h>
32 #include <linux/string.h>
33 #include <linux/socket.h>
34 #include <linux/errno.h>
35 #include <linux/fcntl.h>
36 #include <linux/in.h>
37 #include <linux/if_ether.h>
38 #include <linux/if_arp.h>
39
40 #include <asm/system.h>
41 #include <asm/segment.h>
42 #include <asm/io.h>
43
44 #include <linux/inet.h>
45 #include <linux/netdevice.h>
46 #include <linux/etherdevice.h>
47 #include <linux/skbuff.h>
48 #include <net/sock.h>
49
50 #define LOOPBACK_MTU (PAGE_SIZE*7/8)
51
52 static int loopback_xmit(struct sk_buff *skb, struct device *dev)
53 {
54 struct enet_statistics *stats = (struct enet_statistics *)dev->priv;
55 unsigned long flags;
56 int unlock=1;
57
58 if (skb == NULL || dev == NULL)
59 return(0);
60
61 save_flags(flags);
62 cli();
63 if (dev->tbusy != 0)
64 {
65 restore_flags(flags);
66 stats->tx_errors++;
67 return(1);
68 }
69 dev->tbusy = 1;
70 restore_flags(flags);
71
72
73
74
75
76
77 if(skb->free==0)
78 {
79 struct sk_buff *skb2=skb;
80 skb=skb_clone(skb, GFP_ATOMIC);
81 if(skb==NULL)
82 return 1;
83 dev_kfree_skb(skb2, FREE_READ);
84 unlock=0;
85 }
86 else if(skb->sk)
87 {
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89
90
91
92 save_flags(flags);
93 cli();
94 skb->sk->wmem_alloc-=skb->truesize;
95 skb->sk->write_space(skb->sk);
96 restore_flags(flags);
97 }
98
99 skb->protocol=eth_type_trans(skb,dev);
100 skb->dev=dev;
101 save_flags(flags);
102 cli();
103 #ifndef LOOPBACK_MUST_CHECKSUM
104 skb->ip_summed = CHECKSUM_UNNECESSARY;
105 #endif
106 netif_rx(skb);
107 if(unlock)
108 skb_device_unlock(skb);
109 restore_flags(flags);
110
111 stats->tx_packets++;
112 stats->rx_packets++;
113
114 dev->tbusy = 0;
115
116 return(0);
117 }
118
119 static struct enet_statistics *get_stats(struct device *dev)
120 {
121 return (struct enet_statistics *)dev->priv;
122 }
123
124 static int loopback_open(struct device *dev)
125 {
126 dev->flags|=IFF_LOOPBACK;
127 return 0;
128 }
129
130
131 int loopback_init(struct device *dev)
132 {
133 int i;
134
135 dev->mtu = LOOPBACK_MTU;
136 dev->tbusy = 0;
137 dev->hard_start_xmit = loopback_xmit;
138 dev->open = NULL;
139 dev->hard_header = eth_header;
140 dev->hard_header_len = ETH_HLEN;
141 dev->addr_len = ETH_ALEN;
142 dev->tx_queue_len = 50000;
143 dev->type = ARPHRD_LOOPBACK;
144 dev->rebuild_header = eth_rebuild_header;
145 dev->open = loopback_open;
146 dev->flags = IFF_LOOPBACK|IFF_BROADCAST;
147 dev->family = AF_INET;
148 #ifdef CONFIG_INET
149 dev->pa_addr = in_aton("127.0.0.1");
150 dev->pa_brdaddr = in_aton("127.255.255.255");
151 dev->pa_mask = in_aton("255.0.0.0");
152 dev->pa_alen = 4;
153 #endif
154 dev->priv = kmalloc(sizeof(struct enet_statistics), GFP_KERNEL);
155 if (dev->priv == NULL)
156 return -ENOMEM;
157 memset(dev->priv, 0, sizeof(struct enet_statistics));
158 dev->get_stats = get_stats;
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163
164 for (i = 0; i < DEV_NUMBUFFS; i++)
165 skb_queue_head_init(&dev->buffs[i]);
166
167 return(0);
168 };