551 lines
13 KiB
C
551 lines
13 KiB
C
/*
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* Copyright (C) ST-Ericsson AB 2010
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* Authors: Sjur Brendeland
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* Daniel Martensson
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* License terms: GNU General Public License (GPL) version 2
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ":%s(): " fmt, __func__
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#include <linux/fs.h>
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#include <linux/hardirq.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/netdevice.h>
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#include <linux/if_ether.h>
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#include <linux/ip.h>
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#include <linux/sched.h>
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#include <linux/sockios.h>
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#include <linux/caif/if_caif.h>
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#include <net/rtnetlink.h>
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#include <net/caif/caif_layer.h>
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#include <net/caif/cfpkt.h>
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#include <net/caif/caif_dev.h>
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/* GPRS PDP connection has MTU to 1500 */
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#define GPRS_PDP_MTU 1500
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/* 5 sec. connect timeout */
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#define CONNECT_TIMEOUT (5 * HZ)
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#define CAIF_NET_DEFAULT_QUEUE_LEN 500
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#define UNDEF_CONNID 0xffffffff
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/*This list is protected by the rtnl lock. */
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static LIST_HEAD(chnl_net_list);
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MODULE_LICENSE("GPL");
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MODULE_ALIAS_RTNL_LINK("caif");
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enum caif_states {
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CAIF_CONNECTED = 1,
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CAIF_CONNECTING,
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CAIF_DISCONNECTED,
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CAIF_SHUTDOWN
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};
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struct chnl_net {
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struct cflayer chnl;
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struct net_device_stats stats;
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struct caif_connect_request conn_req;
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struct list_head list_field;
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struct net_device *netdev;
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char name[256];
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wait_queue_head_t netmgmt_wq;
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/* Flow status to remember and control the transmission. */
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bool flowenabled;
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enum caif_states state;
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};
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static void robust_list_del(struct list_head *delete_node)
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{
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struct list_head *list_node;
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struct list_head *n;
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ASSERT_RTNL();
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list_for_each_safe(list_node, n, &chnl_net_list) {
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if (list_node == delete_node) {
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list_del(list_node);
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return;
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}
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}
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WARN_ON(1);
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}
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static int chnl_recv_cb(struct cflayer *layr, struct cfpkt *pkt)
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{
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struct sk_buff *skb;
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struct chnl_net *priv;
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int pktlen;
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const u8 *ip_version;
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u8 buf;
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priv = container_of(layr, struct chnl_net, chnl);
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if (!priv)
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return -EINVAL;
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skb = (struct sk_buff *) cfpkt_tonative(pkt);
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/* Get length of CAIF packet. */
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pktlen = skb->len;
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/* Pass some minimum information and
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* send the packet to the net stack.
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*/
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skb->dev = priv->netdev;
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/* check the version of IP */
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ip_version = skb_header_pointer(skb, 0, 1, &buf);
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if (!ip_version) {
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kfree_skb(skb);
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return -EINVAL;
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}
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switch (*ip_version >> 4) {
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case 4:
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skb->protocol = htons(ETH_P_IP);
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break;
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case 6:
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skb->protocol = htons(ETH_P_IPV6);
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break;
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default:
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kfree_skb(skb);
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priv->netdev->stats.rx_errors++;
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return -EINVAL;
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}
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/* If we change the header in loop mode, the checksum is corrupted. */
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if (priv->conn_req.protocol == CAIFPROTO_DATAGRAM_LOOP)
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skb->ip_summed = CHECKSUM_UNNECESSARY;
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else
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skb->ip_summed = CHECKSUM_NONE;
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if (in_interrupt())
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netif_rx(skb);
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else
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netif_rx_ni(skb);
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/* Update statistics. */
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priv->netdev->stats.rx_packets++;
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priv->netdev->stats.rx_bytes += pktlen;
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return 0;
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}
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static int delete_device(struct chnl_net *dev)
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{
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ASSERT_RTNL();
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if (dev->netdev)
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unregister_netdevice(dev->netdev);
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return 0;
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}
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static void close_work(struct work_struct *work)
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{
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struct chnl_net *dev = NULL;
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struct list_head *list_node;
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struct list_head *_tmp;
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rtnl_lock();
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list_for_each_safe(list_node, _tmp, &chnl_net_list) {
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dev = list_entry(list_node, struct chnl_net, list_field);
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if (dev->state == CAIF_SHUTDOWN)
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dev_close(dev->netdev);
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}
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rtnl_unlock();
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}
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static DECLARE_WORK(close_worker, close_work);
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static void chnl_hold(struct cflayer *lyr)
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{
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struct chnl_net *priv = container_of(lyr, struct chnl_net, chnl);
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dev_hold(priv->netdev);
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}
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static void chnl_put(struct cflayer *lyr)
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{
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struct chnl_net *priv = container_of(lyr, struct chnl_net, chnl);
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dev_put(priv->netdev);
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}
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static void chnl_flowctrl_cb(struct cflayer *layr, enum caif_ctrlcmd flow,
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int phyid)
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{
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struct chnl_net *priv = container_of(layr, struct chnl_net, chnl);
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pr_debug("NET flowctrl func called flow: %s\n",
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flow == CAIF_CTRLCMD_FLOW_ON_IND ? "ON" :
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flow == CAIF_CTRLCMD_INIT_RSP ? "INIT" :
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flow == CAIF_CTRLCMD_FLOW_OFF_IND ? "OFF" :
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flow == CAIF_CTRLCMD_DEINIT_RSP ? "CLOSE/DEINIT" :
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flow == CAIF_CTRLCMD_INIT_FAIL_RSP ? "OPEN_FAIL" :
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flow == CAIF_CTRLCMD_REMOTE_SHUTDOWN_IND ?
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"REMOTE_SHUTDOWN" : "UKNOWN CTRL COMMAND");
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switch (flow) {
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case CAIF_CTRLCMD_FLOW_OFF_IND:
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priv->flowenabled = false;
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netif_stop_queue(priv->netdev);
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break;
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case CAIF_CTRLCMD_DEINIT_RSP:
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priv->state = CAIF_DISCONNECTED;
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break;
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case CAIF_CTRLCMD_INIT_FAIL_RSP:
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priv->state = CAIF_DISCONNECTED;
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wake_up_interruptible(&priv->netmgmt_wq);
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break;
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case CAIF_CTRLCMD_REMOTE_SHUTDOWN_IND:
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priv->state = CAIF_SHUTDOWN;
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netif_tx_disable(priv->netdev);
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schedule_work(&close_worker);
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break;
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case CAIF_CTRLCMD_FLOW_ON_IND:
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priv->flowenabled = true;
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netif_wake_queue(priv->netdev);
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break;
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case CAIF_CTRLCMD_INIT_RSP:
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caif_client_register_refcnt(&priv->chnl, chnl_hold, chnl_put);
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priv->state = CAIF_CONNECTED;
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priv->flowenabled = true;
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netif_wake_queue(priv->netdev);
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wake_up_interruptible(&priv->netmgmt_wq);
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break;
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default:
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break;
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}
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}
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static int chnl_net_start_xmit(struct sk_buff *skb, struct net_device *dev)
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{
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struct chnl_net *priv;
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struct cfpkt *pkt = NULL;
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int len;
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int result = -1;
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/* Get our private data. */
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priv = netdev_priv(dev);
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if (skb->len > priv->netdev->mtu) {
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pr_warn("Size of skb exceeded MTU\n");
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kfree_skb(skb);
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dev->stats.tx_errors++;
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return NETDEV_TX_OK;
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}
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if (!priv->flowenabled) {
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pr_debug("dropping packets flow off\n");
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kfree_skb(skb);
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dev->stats.tx_dropped++;
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return NETDEV_TX_OK;
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}
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if (priv->conn_req.protocol == CAIFPROTO_DATAGRAM_LOOP)
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swap(ip_hdr(skb)->saddr, ip_hdr(skb)->daddr);
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/* Store original SKB length. */
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len = skb->len;
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pkt = cfpkt_fromnative(CAIF_DIR_OUT, (void *) skb);
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/* Send the packet down the stack. */
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result = priv->chnl.dn->transmit(priv->chnl.dn, pkt);
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if (result) {
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dev->stats.tx_dropped++;
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return NETDEV_TX_OK;
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}
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/* Update statistics. */
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dev->stats.tx_packets++;
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dev->stats.tx_bytes += len;
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return NETDEV_TX_OK;
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}
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static int chnl_net_open(struct net_device *dev)
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{
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struct chnl_net *priv = NULL;
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int result = -1;
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int llifindex, headroom, tailroom, mtu;
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struct net_device *lldev;
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ASSERT_RTNL();
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priv = netdev_priv(dev);
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if (!priv) {
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pr_debug("chnl_net_open: no priv\n");
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return -ENODEV;
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}
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if (priv->state != CAIF_CONNECTING) {
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priv->state = CAIF_CONNECTING;
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result = caif_connect_client(dev_net(dev), &priv->conn_req,
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&priv->chnl, &llifindex,
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&headroom, &tailroom);
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if (result != 0) {
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pr_debug("err: "
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"Unable to register and open device,"
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" Err:%d\n",
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result);
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goto error;
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}
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lldev = __dev_get_by_index(dev_net(dev), llifindex);
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if (lldev == NULL) {
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pr_debug("no interface?\n");
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result = -ENODEV;
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goto error;
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}
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dev->needed_tailroom = tailroom + lldev->needed_tailroom;
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dev->hard_header_len = headroom + lldev->hard_header_len +
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lldev->needed_tailroom;
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/*
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* MTU, head-room etc is not know before we have a
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* CAIF link layer device available. MTU calculation may
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* override initial RTNL configuration.
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* MTU is minimum of current mtu, link layer mtu pluss
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* CAIF head and tail, and PDP GPRS contexts max MTU.
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*/
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mtu = min_t(int, dev->mtu, lldev->mtu - (headroom + tailroom));
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mtu = min_t(int, GPRS_PDP_MTU, mtu);
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dev_set_mtu(dev, mtu);
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if (mtu < 100) {
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pr_warn("CAIF Interface MTU too small (%d)\n", mtu);
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result = -ENODEV;
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goto error;
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}
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}
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rtnl_unlock(); /* Release RTNL lock during connect wait */
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result = wait_event_interruptible_timeout(priv->netmgmt_wq,
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priv->state != CAIF_CONNECTING,
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CONNECT_TIMEOUT);
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rtnl_lock();
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if (result == -ERESTARTSYS) {
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pr_debug("wait_event_interruptible woken by a signal\n");
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result = -ERESTARTSYS;
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goto error;
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}
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if (result == 0) {
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pr_debug("connect timeout\n");
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caif_disconnect_client(dev_net(dev), &priv->chnl);
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priv->state = CAIF_DISCONNECTED;
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pr_debug("state disconnected\n");
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result = -ETIMEDOUT;
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goto error;
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}
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if (priv->state != CAIF_CONNECTED) {
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pr_debug("connect failed\n");
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result = -ECONNREFUSED;
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goto error;
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}
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pr_debug("CAIF Netdevice connected\n");
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return 0;
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error:
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caif_disconnect_client(dev_net(dev), &priv->chnl);
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priv->state = CAIF_DISCONNECTED;
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pr_debug("state disconnected\n");
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return result;
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}
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static int chnl_net_stop(struct net_device *dev)
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{
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struct chnl_net *priv;
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ASSERT_RTNL();
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priv = netdev_priv(dev);
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priv->state = CAIF_DISCONNECTED;
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caif_disconnect_client(dev_net(dev), &priv->chnl);
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return 0;
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}
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static int chnl_net_init(struct net_device *dev)
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{
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struct chnl_net *priv;
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ASSERT_RTNL();
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priv = netdev_priv(dev);
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strncpy(priv->name, dev->name, sizeof(priv->name));
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return 0;
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}
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static void chnl_net_uninit(struct net_device *dev)
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{
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struct chnl_net *priv;
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ASSERT_RTNL();
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priv = netdev_priv(dev);
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robust_list_del(&priv->list_field);
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}
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static const struct net_device_ops netdev_ops = {
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.ndo_open = chnl_net_open,
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.ndo_stop = chnl_net_stop,
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.ndo_init = chnl_net_init,
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.ndo_uninit = chnl_net_uninit,
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.ndo_start_xmit = chnl_net_start_xmit,
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};
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static void chnl_net_destructor(struct net_device *dev)
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{
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struct chnl_net *priv = netdev_priv(dev);
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caif_free_client(&priv->chnl);
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free_netdev(dev);
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}
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static void ipcaif_net_setup(struct net_device *dev)
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{
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struct chnl_net *priv;
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dev->netdev_ops = &netdev_ops;
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dev->destructor = chnl_net_destructor;
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dev->flags |= IFF_NOARP;
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dev->flags |= IFF_POINTOPOINT;
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dev->mtu = GPRS_PDP_MTU;
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dev->tx_queue_len = CAIF_NET_DEFAULT_QUEUE_LEN;
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priv = netdev_priv(dev);
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priv->chnl.receive = chnl_recv_cb;
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priv->chnl.ctrlcmd = chnl_flowctrl_cb;
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priv->netdev = dev;
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priv->conn_req.protocol = CAIFPROTO_DATAGRAM;
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priv->conn_req.link_selector = CAIF_LINK_HIGH_BANDW;
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priv->conn_req.priority = CAIF_PRIO_LOW;
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/* Insert illegal value */
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priv->conn_req.sockaddr.u.dgm.connection_id = UNDEF_CONNID;
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priv->flowenabled = false;
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init_waitqueue_head(&priv->netmgmt_wq);
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}
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static int ipcaif_fill_info(struct sk_buff *skb, const struct net_device *dev)
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{
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struct chnl_net *priv;
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u8 loop;
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priv = netdev_priv(dev);
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if (nla_put_u32(skb, IFLA_CAIF_IPV4_CONNID,
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priv->conn_req.sockaddr.u.dgm.connection_id) ||
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nla_put_u32(skb, IFLA_CAIF_IPV6_CONNID,
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priv->conn_req.sockaddr.u.dgm.connection_id))
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goto nla_put_failure;
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loop = priv->conn_req.protocol == CAIFPROTO_DATAGRAM_LOOP;
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if (nla_put_u8(skb, IFLA_CAIF_LOOPBACK, loop))
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goto nla_put_failure;
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return 0;
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nla_put_failure:
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return -EMSGSIZE;
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}
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static void caif_netlink_parms(struct nlattr *data[],
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struct caif_connect_request *conn_req)
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{
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if (!data) {
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pr_warn("no params data found\n");
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return;
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}
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if (data[IFLA_CAIF_IPV4_CONNID])
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conn_req->sockaddr.u.dgm.connection_id =
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nla_get_u32(data[IFLA_CAIF_IPV4_CONNID]);
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if (data[IFLA_CAIF_IPV6_CONNID])
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conn_req->sockaddr.u.dgm.connection_id =
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nla_get_u32(data[IFLA_CAIF_IPV6_CONNID]);
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if (data[IFLA_CAIF_LOOPBACK]) {
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if (nla_get_u8(data[IFLA_CAIF_LOOPBACK]))
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conn_req->protocol = CAIFPROTO_DATAGRAM_LOOP;
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else
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conn_req->protocol = CAIFPROTO_DATAGRAM;
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}
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}
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static int ipcaif_newlink(struct net *src_net, struct net_device *dev,
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struct nlattr *tb[], struct nlattr *data[])
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{
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int ret;
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struct chnl_net *caifdev;
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ASSERT_RTNL();
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caifdev = netdev_priv(dev);
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caif_netlink_parms(data, &caifdev->conn_req);
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ret = register_netdevice(dev);
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if (ret)
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pr_warn("device rtml registration failed\n");
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else
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list_add(&caifdev->list_field, &chnl_net_list);
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/* Use ifindex as connection id, and use loopback channel default. */
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if (caifdev->conn_req.sockaddr.u.dgm.connection_id == UNDEF_CONNID) {
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caifdev->conn_req.sockaddr.u.dgm.connection_id = dev->ifindex;
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caifdev->conn_req.protocol = CAIFPROTO_DATAGRAM_LOOP;
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}
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return ret;
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}
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static int ipcaif_changelink(struct net_device *dev, struct nlattr *tb[],
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struct nlattr *data[])
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{
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struct chnl_net *caifdev;
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ASSERT_RTNL();
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caifdev = netdev_priv(dev);
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caif_netlink_parms(data, &caifdev->conn_req);
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netdev_state_change(dev);
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return 0;
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}
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static size_t ipcaif_get_size(const struct net_device *dev)
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{
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return
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/* IFLA_CAIF_IPV4_CONNID */
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nla_total_size(4) +
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/* IFLA_CAIF_IPV6_CONNID */
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nla_total_size(4) +
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/* IFLA_CAIF_LOOPBACK */
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nla_total_size(2) +
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0;
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}
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static const struct nla_policy ipcaif_policy[IFLA_CAIF_MAX + 1] = {
|
|
[IFLA_CAIF_IPV4_CONNID] = { .type = NLA_U32 },
|
|
[IFLA_CAIF_IPV6_CONNID] = { .type = NLA_U32 },
|
|
[IFLA_CAIF_LOOPBACK] = { .type = NLA_U8 }
|
|
};
|
|
|
|
|
|
static struct rtnl_link_ops ipcaif_link_ops __read_mostly = {
|
|
.kind = "caif",
|
|
.priv_size = sizeof(struct chnl_net),
|
|
.setup = ipcaif_net_setup,
|
|
.maxtype = IFLA_CAIF_MAX,
|
|
.policy = ipcaif_policy,
|
|
.newlink = ipcaif_newlink,
|
|
.changelink = ipcaif_changelink,
|
|
.get_size = ipcaif_get_size,
|
|
.fill_info = ipcaif_fill_info,
|
|
|
|
};
|
|
|
|
static int __init chnl_init_module(void)
|
|
{
|
|
return rtnl_link_register(&ipcaif_link_ops);
|
|
}
|
|
|
|
static void __exit chnl_exit_module(void)
|
|
{
|
|
struct chnl_net *dev = NULL;
|
|
struct list_head *list_node;
|
|
struct list_head *_tmp;
|
|
rtnl_link_unregister(&ipcaif_link_ops);
|
|
rtnl_lock();
|
|
list_for_each_safe(list_node, _tmp, &chnl_net_list) {
|
|
dev = list_entry(list_node, struct chnl_net, list_field);
|
|
list_del(list_node);
|
|
delete_device(dev);
|
|
}
|
|
rtnl_unlock();
|
|
}
|
|
|
|
module_init(chnl_init_module);
|
|
module_exit(chnl_exit_module);
|