1 // SPDX-License-Identifier: GPL-2.0-only
3  * File: pep-gprs.c
9  * Author: Rémi Denis-Courmont
53 static void gprs_writeable(struct gprs_dev *gp)  in gprs_writeable()  argument
55 	struct net_device *dev = gp->dev;  in gprs_writeable()
57 	if (pep_writeable(gp->sk))  in gprs_writeable()
67 	struct gprs_dev *gp = sk->sk_user_data;  in gprs_state_change()  local
69 	if (sk->sk_state == TCP_CLOSE_WAIT) {  in gprs_state_change()
70 		struct net_device *dev = gp->dev;  in gprs_state_change()
77 static int gprs_recv(struct gprs_dev *gp, struct sk_buff *skb)  in gprs_recv()  argument
79 	struct net_device *dev = gp->dev;  in gprs_recv()
84 		err = -EINVAL;  in gprs_recv()
93 		 * so wrap the IP packet as a single fragment of an head-less  in gprs_recv()
98 			err = -ENOBUFS;  in gprs_recv()
101 		skb_shinfo(rskb)->frag_list = skb;  in gprs_recv()
102 		rskb->len += skb->len;  in gprs_recv()
103 		rskb->data_len += rskb->len;  in gprs_recv()
104 		rskb->truesize += rskb->len;  in gprs_recv()
108 			flen += fs->len;  in gprs_recv()
109 		skb->next = skb_shinfo(skb)->frag_list;  in gprs_recv()
111 		skb->len -= flen;  in gprs_recv()
112 		skb->data_len -= flen;  in gprs_recv()
113 		skb->truesize -= flen;  in gprs_recv()
118 	skb->protocol = protocol;  in gprs_recv()
120 	skb->dev = dev;  in gprs_recv()
122 	if (likely(dev->flags & IFF_UP)) {  in gprs_recv()
123 		dev->stats.rx_packets++;  in gprs_recv()
124 		dev->stats.rx_bytes += skb->len;  in gprs_recv()
128 		err = -ENODEV;  in gprs_recv()
133 		dev->stats.rx_dropped++;  in gprs_recv()
140 	struct gprs_dev *gp = sk->sk_user_data;  in gprs_data_ready()  local
147 		gprs_recv(gp, skb);  in gprs_data_ready()
153 	struct gprs_dev *gp = sk->sk_user_data;  in gprs_write_space()  local
155 	if (netif_running(gp->dev))  in gprs_write_space()
156 		gprs_writeable(gp);  in gprs_write_space()
165 	struct gprs_dev *gp = netdev_priv(dev);  in gprs_open()  local
167 	gprs_writeable(gp);  in gprs_open()
179 	struct gprs_dev *gp = netdev_priv(dev);  in gprs_xmit()  local
180 	struct sock *sk = gp->sk;  in gprs_xmit()
183 	switch (skb->protocol) {  in gprs_xmit()
194 	len = skb->len;  in gprs_xmit()
197 		net_dbg_ratelimited("%s: TX error (%d)\n", dev->name, err);  in gprs_xmit()
198 		dev->stats.tx_aborted_errors++;  in gprs_xmit()
199 		dev->stats.tx_errors++;  in gprs_xmit()
201 		dev->stats.tx_packets++;  in gprs_xmit()
202 		dev->stats.tx_bytes += len;  in gprs_xmit()
219 	dev->features		= NETIF_F_FRAGLIST;  in gprs_setup()
220 	dev->type		= ARPHRD_PHONET_PIPE;  in gprs_setup()
221 	dev->flags		= IFF_POINTOPOINT | IFF_NOARP;  in gprs_setup()
222 	dev->mtu		= GPRS_DEFAULT_MTU;  in gprs_setup()
223 	dev->min_mtu		= 576;  in gprs_setup()
224 	dev->max_mtu		= (PHONET_MAX_MTU - 11);  in gprs_setup()
225 	dev->hard_header_len	= 0;  in gprs_setup()
226 	dev->addr_len		= 0;  in gprs_setup()
227 	dev->tx_queue_len	= 10;  in gprs_setup()
229 	dev->netdev_ops		= &gprs_netdev_ops;  in gprs_setup()
230 	dev->needs_free_netdev	= true;  in gprs_setup()
244 	struct gprs_dev *gp;  in gprs_attach()  local
248 	if (unlikely(sk->sk_type == SOCK_STREAM))  in gprs_attach()
249 		return -EINVAL; /* need packet boundaries */  in gprs_attach()
252 	dev = alloc_netdev(sizeof(*gp), ifname, NET_NAME_UNKNOWN, gprs_setup);  in gprs_attach()
254 		return -ENOMEM;  in gprs_attach()
255 	gp = netdev_priv(dev);  in gprs_attach()
256 	gp->sk = sk;  in gprs_attach()
257 	gp->dev = dev;  in gprs_attach()
267 	if (unlikely(sk->sk_user_data)) {  in gprs_attach()
268 		err = -EBUSY;  in gprs_attach()
271 	if (unlikely((1 << sk->sk_state & (TCPF_CLOSE|TCPF_LISTEN)) ||  in gprs_attach()
273 		err = -EINVAL;  in gprs_attach()
276 	sk->sk_user_data	= gp;  in gprs_attach()
277 	gp->old_state_change	= sk->sk_state_change;  in gprs_attach()
278 	gp->old_data_ready	= sk->sk_data_ready;  in gprs_attach()
279 	gp->old_write_space	= sk->sk_write_space;  in gprs_attach()
280 	sk->sk_state_change	= gprs_state_change;  in gprs_attach()
281 	sk->sk_data_ready	= gprs_data_ready;  in gprs_attach()
282 	sk->sk_write_space	= gprs_write_space;  in gprs_attach()
286 	printk(KERN_DEBUG"%s: attached\n", dev->name);  in gprs_attach()
287 	return dev->ifindex;  in gprs_attach()
297 	struct gprs_dev *gp = sk->sk_user_data;  in gprs_detach()  local
298 	struct net_device *dev = gp->dev;  in gprs_detach()
301 	sk->sk_user_data	= NULL;  in gprs_detach()
302 	sk->sk_state_change	= gp->old_state_change;  in gprs_detach()
303 	sk->sk_data_ready	= gp->old_data_ready;  in gprs_detach()
304 	sk->sk_write_space	= gp->old_write_space;  in gprs_detach()
307 	printk(KERN_DEBUG"%s: detached\n", dev->name);  in gprs_detach()