Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * File: pep-gprs.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * GPRS over Phonet pipe end point socket
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  * Copyright (C) 2008 Nokia Corporation.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9)  * Author: Rémi Denis-Courmont
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/netdevice.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/if_ether.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/if_arp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <net/sock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <linux/if_phonet.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <net/tcp_states.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #include <net/phonet/gprs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) #define GPRS_DEFAULT_MTU 1400
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) struct gprs_dev {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 	struct sock		*sk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 	void			(*old_state_change)(struct sock *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 	void			(*old_data_ready)(struct sock *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 	void			(*old_write_space)(struct sock *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 	struct net_device	*dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) static __be16 gprs_type_trans(struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 	const u8 *pvfc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 	u8 buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 	pvfc = skb_header_pointer(skb, 0, 1, &buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 	if (!pvfc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 		return htons(0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	/* Look at IP version field */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 	switch (*pvfc >> 4) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 	case 4:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 		return htons(ETH_P_IP);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 	case 6:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 		return htons(ETH_P_IPV6);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 	return htons(0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) static void gprs_writeable(struct gprs_dev *gp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 	struct net_device *dev = gp->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	if (pep_writeable(gp->sk))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 		netif_wake_queue(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60)  * Socket callbacks
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) static void gprs_state_change(struct sock *sk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	struct gprs_dev *gp = sk->sk_user_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	if (sk->sk_state == TCP_CLOSE_WAIT) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 		struct net_device *dev = gp->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 		netif_stop_queue(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 		netif_carrier_off(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) static int gprs_recv(struct gprs_dev *gp, struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 	struct net_device *dev = gp->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 	int err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	__be16 protocol = gprs_type_trans(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 	if (!protocol) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 		err = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 		goto drop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	if (skb_headroom(skb) & 3) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 		struct sk_buff *rskb, *fs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 		int flen = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 		/* Phonet Pipe data header may be misaligned (3 bytes),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 		 * so wrap the IP packet as a single fragment of an head-less
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 		 * socket buffer. The network stack will pull what it needs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 		 * but at least, the whole IP payload is not memcpy'd. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 		rskb = netdev_alloc_skb(dev, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 		if (!rskb) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 			err = -ENOBUFS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 			goto drop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 		skb_shinfo(rskb)->frag_list = skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 		rskb->len += skb->len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 		rskb->data_len += rskb->len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 		rskb->truesize += rskb->len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 		/* Avoid nested fragments */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 		skb_walk_frags(skb, fs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 			flen += fs->len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 		skb->next = skb_shinfo(skb)->frag_list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 		skb_frag_list_init(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 		skb->len -= flen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 		skb->data_len -= flen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 		skb->truesize -= flen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 		skb = rskb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	skb->protocol = protocol;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 	skb_reset_mac_header(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 	skb->dev = dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	if (likely(dev->flags & IFF_UP)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 		dev->stats.rx_packets++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 		dev->stats.rx_bytes += skb->len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 		netif_rx(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 		skb = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 	} else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 		err = -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) drop:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 	if (skb) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 		dev_kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 		dev->stats.rx_dropped++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 	return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) static void gprs_data_ready(struct sock *sk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 	struct gprs_dev *gp = sk->sk_user_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 	struct sk_buff *skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 	while ((skb = pep_read(sk)) != NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 		skb_orphan(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 		gprs_recv(gp, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) static void gprs_write_space(struct sock *sk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 	struct gprs_dev *gp = sk->sk_user_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 	if (netif_running(gp->dev))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 		gprs_writeable(gp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156)  * Network device callbacks
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) static int gprs_open(struct net_device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 	struct gprs_dev *gp = netdev_priv(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 	gprs_writeable(gp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) static int gprs_close(struct net_device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	netif_stop_queue(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) static netdev_tx_t gprs_xmit(struct sk_buff *skb, struct net_device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 	struct gprs_dev *gp = netdev_priv(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 	struct sock *sk = gp->sk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 	int len, err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 	switch (skb->protocol) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 	case  htons(ETH_P_IP):
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 	case  htons(ETH_P_IPV6):
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 		dev_kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 		return NETDEV_TX_OK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 	skb_orphan(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 	skb_set_owner_w(skb, sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 	len = skb->len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 	err = pep_write(sk, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 	if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 		net_dbg_ratelimited("%s: TX error (%d)\n", dev->name, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 		dev->stats.tx_aborted_errors++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 		dev->stats.tx_errors++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 		dev->stats.tx_packets++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 		dev->stats.tx_bytes += len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 	netif_stop_queue(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 	if (pep_writeable(sk))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 		netif_wake_queue(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 	return NETDEV_TX_OK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) static const struct net_device_ops gprs_netdev_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 	.ndo_open	= gprs_open,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 	.ndo_stop	= gprs_close,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 	.ndo_start_xmit	= gprs_xmit,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) static void gprs_setup(struct net_device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 	dev->features		= NETIF_F_FRAGLIST;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 	dev->type		= ARPHRD_PHONET_PIPE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 	dev->flags		= IFF_POINTOPOINT | IFF_NOARP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 	dev->mtu		= GPRS_DEFAULT_MTU;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 	dev->min_mtu		= 576;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 	dev->max_mtu		= (PHONET_MAX_MTU - 11);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 	dev->hard_header_len	= 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 	dev->addr_len		= 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 	dev->tx_queue_len	= 10;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 	dev->netdev_ops		= &gprs_netdev_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 	dev->needs_free_netdev	= true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230)  * External interface
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234)  * Attach a GPRS interface to a datagram socket.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235)  * Returns the interface index on success, negative error code on error.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) int gprs_attach(struct sock *sk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 	static const char ifname[] = "gprs%d";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 	struct gprs_dev *gp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 	struct net_device *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 	if (unlikely(sk->sk_type == SOCK_STREAM))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 		return -EINVAL; /* need packet boundaries */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 	/* Create net device */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 	dev = alloc_netdev(sizeof(*gp), ifname, NET_NAME_UNKNOWN, gprs_setup);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 	if (!dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 	gp = netdev_priv(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 	gp->sk = sk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 	gp->dev = dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 	netif_stop_queue(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 	err = register_netdev(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 	if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 		free_netdev(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 		return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 	lock_sock(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 	if (unlikely(sk->sk_user_data)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 		err = -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 		goto out_rel;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 	if (unlikely((1 << sk->sk_state & (TCPF_CLOSE|TCPF_LISTEN)) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 			sock_flag(sk, SOCK_DEAD))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 		err = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 		goto out_rel;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 	sk->sk_user_data	= gp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 	gp->old_state_change	= sk->sk_state_change;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 	gp->old_data_ready	= sk->sk_data_ready;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 	gp->old_write_space	= sk->sk_write_space;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 	sk->sk_state_change	= gprs_state_change;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 	sk->sk_data_ready	= gprs_data_ready;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 	sk->sk_write_space	= gprs_write_space;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 	release_sock(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 	sock_hold(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 	printk(KERN_DEBUG"%s: attached\n", dev->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 	return dev->ifindex;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) out_rel:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 	release_sock(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 	unregister_netdev(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 	return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) void gprs_detach(struct sock *sk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 	struct gprs_dev *gp = sk->sk_user_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 	struct net_device *dev = gp->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 	lock_sock(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 	sk->sk_user_data	= NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 	sk->sk_state_change	= gp->old_state_change;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 	sk->sk_data_ready	= gp->old_data_ready;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 	sk->sk_write_space	= gp->old_write_space;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 	release_sock(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 	printk(KERN_DEBUG"%s: detached\n", dev->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 	unregister_netdev(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 	sock_put(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) }