2 * X.25 Packet Layer release 002
4 * This is ALPHA test software. This code may break your machine, randomly fail to work with new
5 * releases, misbehave and/or generally screw up. It might even work.
7 * This code REQUIRES 2.1.15 or higher
10 * This module is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
16 * X.25 001 Jonathan Naylor Started coding.
17 * 2000-09-04 Henner Eisen Prevent freeing a dangling skb.
20 #include <linux/kernel.h>
21 #include <linux/netdevice.h>
22 #include <linux/skbuff.h>
24 #include <linux/if_arp.h>
27 static int x25_receive_data(struct sk_buff
*skb
, struct x25_neigh
*nb
)
30 unsigned short frametype
;
33 frametype
= skb
->data
[2];
34 lci
= ((skb
->data
[0] << 8) & 0xF00) + ((skb
->data
[1] << 0) & 0x0FF);
37 * LCI of zero is always for us, and its always a link control
41 x25_link_control(skb
, nb
, frametype
);
46 * Find an existing socket.
48 if ((sk
= x25_find_socket(lci
, nb
)) != NULL
) {
51 skb_reset_transport_header(skb
);
53 if (!sock_owned_by_user(sk
)) {
54 queued
= x25_process_rx_frame(sk
, skb
);
56 sk_add_backlog(sk
, skb
);
64 * Is is a Call Request ? if so process it.
66 if (frametype
== X25_CALL_REQUEST
)
67 return x25_rx_call_request(skb
, nb
, lci
);
70 * Its not a Call Request, nor is it a control frame.
74 if (x25_forward_data(lci
, nb
, skb
)) {
75 if (frametype
== X25_CLEAR_CONFIRMATION
) {
76 x25_clear_forward_by_lci(lci
);
83 x25_transmit_clear_request(nb, lci, 0x0D);
86 if (frametype
!= X25_CLEAR_CONFIRMATION
)
87 printk(KERN_DEBUG
"x25_receive_data(): unknown frame type %2x\n",frametype
);
92 int x25_lapb_receive_frame(struct sk_buff
*skb
, struct net_device
*dev
,
93 struct packet_type
*ptype
, struct net_device
*orig_dev
)
98 if (!net_eq(dev_net(dev
), &init_net
))
101 nskb
= skb_copy(skb
, GFP_ATOMIC
);
108 * Packet received from unrecognised device, throw it away.
110 nb
= x25_get_neigh(dev
);
112 printk(KERN_DEBUG
"X.25: unknown neighbour - %s\n", dev
->name
);
116 switch (skb
->data
[0]) {
119 if (x25_receive_data(skb
, nb
)) {
125 x25_link_established(nb
);
128 x25_link_terminated(nb
);
138 void x25_establish_link(struct x25_neigh
*nb
)
143 switch (nb
->dev
->type
) {
145 if ((skb
= alloc_skb(1, GFP_ATOMIC
)) == NULL
) {
146 printk(KERN_ERR
"x25_dev: out of memory\n");
149 ptr
= skb_put(skb
, 1);
153 #if defined(CONFIG_LLC) || defined(CONFIG_LLC_MODULE)
161 skb
->protocol
= htons(ETH_P_X25
);
167 void x25_terminate_link(struct x25_neigh
*nb
)
172 #if defined(CONFIG_LLC) || defined(CONFIG_LLC_MODULE)
173 if (nb
->dev
->type
== ARPHRD_ETHER
)
176 if (nb
->dev
->type
!= ARPHRD_X25
)
179 skb
= alloc_skb(1, GFP_ATOMIC
);
181 printk(KERN_ERR
"x25_dev: out of memory\n");
185 ptr
= skb_put(skb
, 1);
188 skb
->protocol
= htons(ETH_P_X25
);
193 void x25_send_frame(struct sk_buff
*skb
, struct x25_neigh
*nb
)
197 skb_reset_network_header(skb
);
199 switch (nb
->dev
->type
) {
201 dptr
= skb_push(skb
, 1);
205 #if defined(CONFIG_LLC) || defined(CONFIG_LLC_MODULE)
215 skb
->protocol
= htons(ETH_P_X25
);
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