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26#include <linux/module.h>
27#include <linux/gfp.h>
28#include <linux/init.h>
29#include <linux/if_arp.h>
30#include <net/arp.h>
31#include <linux/netdevice.h>
32#include <linux/skbuff.h>
33#include <linux/arcdevice.h>
34
35#define VERSION "arcnet: RFC1051 \"simple standard\" (`s') encapsulation support loaded.\n"
36
37
38static __be16 type_trans(struct sk_buff *skb, struct net_device *dev);
39static void rx(struct net_device *dev, int bufnum,
40 struct archdr *pkthdr, int length);
41static int build_header(struct sk_buff *skb, struct net_device *dev,
42 unsigned short type, uint8_t daddr);
43static int prepare_tx(struct net_device *dev, struct archdr *pkt, int length,
44 int bufnum);
45
46
47static struct ArcProto rfc1051_proto =
48{
49 .suffix = 's',
50 .mtu = XMTU - RFC1051_HDR_SIZE,
51 .is_ip = 1,
52 .rx = rx,
53 .build_header = build_header,
54 .prepare_tx = prepare_tx,
55 .continue_tx = NULL,
56 .ack_tx = NULL
57};
58
59
60static int __init arcnet_rfc1051_init(void)
61{
62 printk(VERSION);
63
64 arc_proto_map[ARC_P_IP_RFC1051]
65 = arc_proto_map[ARC_P_ARP_RFC1051]
66 = &rfc1051_proto;
67
68
69 if (arc_bcast_proto == arc_proto_default)
70 arc_bcast_proto = &rfc1051_proto;
71
72 return 0;
73}
74
75static void __exit arcnet_rfc1051_exit(void)
76{
77 arcnet_unregister_proto(&rfc1051_proto);
78}
79
80module_init(arcnet_rfc1051_init);
81module_exit(arcnet_rfc1051_exit);
82
83MODULE_LICENSE("GPL");
84
85
86
87
88
89
90static __be16 type_trans(struct sk_buff *skb, struct net_device *dev)
91{
92 struct archdr *pkt = (struct archdr *) skb->data;
93 struct arc_rfc1051 *soft = &pkt->soft.rfc1051;
94 int hdr_size = ARC_HDR_SIZE + RFC1051_HDR_SIZE;
95
96
97 skb_reset_mac_header(skb);
98 skb_pull(skb, hdr_size);
99
100 if (pkt->hard.dest == 0)
101 skb->pkt_type = PACKET_BROADCAST;
102 else if (dev->flags & IFF_PROMISC) {
103
104 if (pkt->hard.dest != dev->dev_addr[0])
105 skb->pkt_type = PACKET_OTHERHOST;
106 }
107
108 switch (soft->proto) {
109 case ARC_P_IP_RFC1051:
110 return htons(ETH_P_IP);
111 case ARC_P_ARP_RFC1051:
112 return htons(ETH_P_ARP);
113
114 default:
115 dev->stats.rx_errors++;
116 dev->stats.rx_crc_errors++;
117 return 0;
118 }
119
120 return htons(ETH_P_IP);
121}
122
123
124
125static void rx(struct net_device *dev, int bufnum,
126 struct archdr *pkthdr, int length)
127{
128 struct arcnet_local *lp = netdev_priv(dev);
129 struct sk_buff *skb;
130 struct archdr *pkt = pkthdr;
131 int ofs;
132
133 BUGMSG(D_DURING, "it's a raw packet (length=%d)\n", length);
134
135 if (length >= MinTU)
136 ofs = 512 - length;
137 else
138 ofs = 256 - length;
139
140 skb = alloc_skb(length + ARC_HDR_SIZE, GFP_ATOMIC);
141 if (skb == NULL) {
142 BUGMSG(D_NORMAL, "Memory squeeze, dropping packet.\n");
143 dev->stats.rx_dropped++;
144 return;
145 }
146 skb_put(skb, length + ARC_HDR_SIZE);
147 skb->dev = dev;
148
149 pkt = (struct archdr *) skb->data;
150
151
152 memcpy(pkt, pkthdr, sizeof(struct archdr));
153 if (length > sizeof(pkt->soft))
154 lp->hw.copy_from_card(dev, bufnum, ofs + sizeof(pkt->soft),
155 pkt->soft.raw + sizeof(pkt->soft),
156 length - sizeof(pkt->soft));
157
158 BUGLVL(D_SKB) arcnet_dump_skb(dev, skb, "rx");
159
160 skb->protocol = type_trans(skb, dev);
161 netif_rx(skb);
162}
163
164
165
166
167
168static int build_header(struct sk_buff *skb, struct net_device *dev,
169 unsigned short type, uint8_t daddr)
170{
171 int hdr_size = ARC_HDR_SIZE + RFC1051_HDR_SIZE;
172 struct archdr *pkt = (struct archdr *) skb_push(skb, hdr_size);
173 struct arc_rfc1051 *soft = &pkt->soft.rfc1051;
174
175
176 switch (type) {
177 case ETH_P_IP:
178 soft->proto = ARC_P_IP_RFC1051;
179 break;
180 case ETH_P_ARP:
181 soft->proto = ARC_P_ARP_RFC1051;
182 break;
183 default:
184 BUGMSG(D_NORMAL, "RFC1051: I don't understand protocol %d (%Xh)\n",
185 type, type);
186 dev->stats.tx_errors++;
187 dev->stats.tx_aborted_errors++;
188 return 0;
189 }
190
191
192
193
194
195
196
197
198
199 pkt->hard.source = *dev->dev_addr;
200
201
202
203 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) {
204
205
206
207
208 pkt->hard.dest = 0;
209 return hdr_size;
210 }
211
212 pkt->hard.dest = daddr;
213
214 return hdr_size;
215}
216
217
218static int prepare_tx(struct net_device *dev, struct archdr *pkt, int length,
219 int bufnum)
220{
221 struct arcnet_local *lp = netdev_priv(dev);
222 struct arc_hardware *hard = &pkt->hard;
223 int ofs;
224
225 BUGMSG(D_DURING, "prepare_tx: txbufs=%d/%d/%d\n",
226 lp->next_tx, lp->cur_tx, bufnum);
227
228 length -= ARC_HDR_SIZE;
229
230 if (length > XMTU) {
231
232 BUGMSG(D_NORMAL, "Bug! prepare_tx with size %d (> %d)\n",
233 length, XMTU);
234 length = XMTU;
235 }
236 if (length > MinTU) {
237 hard->offset[0] = 0;
238 hard->offset[1] = ofs = 512 - length;
239 } else if (length > MTU) {
240 hard->offset[0] = 0;
241 hard->offset[1] = ofs = 512 - length - 3;
242 } else
243 hard->offset[0] = ofs = 256 - length;
244
245 lp->hw.copy_to_card(dev, bufnum, 0, hard, ARC_HDR_SIZE);
246 lp->hw.copy_to_card(dev, bufnum, ofs, &pkt->soft, length);
247
248 lp->lastload_dest = hard->dest;
249
250 return 1;
251}
252