net-caif: add CAIF netdevice
Adding GPRS Net Device for PDP Contexts. The device can be managed by RTNL as defined in if_caif.h. Signed-off-by: Sjur Braendeland <sjur.brandeland@stericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Sjur Braendeland
David S. Miller
parent
e6f95ec8db
commit
cc36a070b5
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@ -0,0 +1,451 @@
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/*
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* Copyright (C) ST-Ericsson AB 2010
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* Authors: Sjur Brendeland/sjur.brandeland@stericsson.com
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* Daniel Martensson / Daniel.Martensson@stericsson.com
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* License terms: GNU General Public License (GPL) version 2
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*/
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#include <linux/version.h>
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#include <linux/fs.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/moduleparam.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/cfcnfg.h>
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#include <net/caif/cfpkt.h>
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#include <net/caif/caif_dev.h>
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#define CAIF_CONNECT_TIMEOUT 30
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#define SIZE_MTU 1500
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#define SIZE_MTU_MAX 4080
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#define SIZE_MTU_MIN 68
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#define CAIF_NET_DEFAULT_QUEUE_LEN 500
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#undef pr_debug
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#define pr_debug pr_warning
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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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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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bool pending_close;
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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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break;
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}
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}
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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 = NULL;
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int pktlen;
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int err = 0;
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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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/* Get length of CAIF packet. */
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pktlen = cfpkt_getlen(pkt);
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skb = (struct sk_buff *) cfpkt_tonative(pkt);
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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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skb->protocol = htons(ETH_P_IP);
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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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/* FIXME: Drivers should call this in tasklet context. */
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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 err;
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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->pending_close)
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continue;
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list_del(list_node);
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delete_device(dev);
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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_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;
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pr_debug("CAIF: %s(): NET flowctrl func called flow: %s.\n",
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__func__,
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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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priv = container_of(layr, struct chnl_net, chnl);
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switch (flow) {
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case CAIF_CTRLCMD_FLOW_OFF_IND:
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case CAIF_CTRLCMD_DEINIT_RSP:
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case CAIF_CTRLCMD_INIT_FAIL_RSP:
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case CAIF_CTRLCMD_REMOTE_SHUTDOWN_IND:
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priv->flowenabled = false;
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netif_tx_disable(priv->netdev);
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pr_warning("CAIF: %s(): done\n", __func__);
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priv->pending_close = 1;
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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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case CAIF_CTRLCMD_INIT_RSP:
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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_warning("CAIF: %s(): Size of skb exceeded MTU\n", __func__);
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return -ENOSPC;
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}
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if (!priv->flowenabled) {
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pr_debug("CAIF: %s(): dropping packets flow off\n", __func__);
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return NETDEV_TX_BUSY;
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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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pr_debug("CAIF: %s(): transmit inst %s %d,%p\n",
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__func__, dev->name, priv->chnl.dn->id, &priv->chnl.dn);
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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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if (result == -EAGAIN)
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result = NETDEV_TX_BUSY;
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return result;
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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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ASSERT_RTNL();
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priv = netdev_priv(dev);
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pr_debug("CAIF: %s(): dev name: %s\n", __func__, priv->name);
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if (!priv) {
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pr_debug("CAIF: %s(): chnl_net_open: no priv\n", __func__);
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return -ENODEV;
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}
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result = caif_connect_client(&priv->conn_req, &priv->chnl);
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if (result != 0) {
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pr_debug("CAIF: %s(): err: "
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"Unable to register and open device, Err:%d\n",
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__func__,
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result);
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return -ENODEV;
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}
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result = wait_event_interruptible(priv->netmgmt_wq, priv->flowenabled);
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if (result == -ERESTARTSYS) {
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pr_debug("CAIF: %s(): wait_event_interruptible"
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" woken by a signal\n", __func__);
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return -ERESTARTSYS;
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} else
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pr_debug("CAIF: %s(): Flow on recieved\n", __func__);
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return 0;
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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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int result = -1;
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ASSERT_RTNL();
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priv = netdev_priv(dev);
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result = caif_disconnect_client(&priv->chnl);
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if (result != 0) {
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pr_debug("CAIF: %s(): chnl_net_stop: err: "
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"Unable to STOP device, Err:%d\n",
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__func__, result);
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return -EBUSY;
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}
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result = wait_event_interruptible(priv->netmgmt_wq,
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!priv->flowenabled);
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if (result == -ERESTARTSYS) {
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pr_debug("CAIF: %s(): wait_event_interruptible woken by"
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" signal, signal_pending(current) = %d\n",
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__func__,
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signal_pending(current));
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} else {
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pr_debug("CAIF: %s(): disconnect received\n", __func__);
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}
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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 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 = free_netdev;
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dev->flags |= IFF_NOARP;
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dev->flags |= IFF_POINTOPOINT;
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dev->needed_headroom = CAIF_NEEDED_HEADROOM;
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dev->needed_tailroom = CAIF_NEEDED_TAILROOM;
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dev->mtu = SIZE_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 = -1;
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priv->flowenabled = false;
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ASSERT_RTNL();
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init_waitqueue_head(&priv->netmgmt_wq);
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list_add(&priv->list_field, &chnl_net_list);
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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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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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loop = priv->conn_req.protocol == CAIFPROTO_DATAGRAM_LOOP;
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NLA_PUT_U8(skb, IFLA_CAIF_LOOPBACK, loop);
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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_warning("CAIF: %s: no params data found\n", __func__);
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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_warning("CAIF: %s(): device rtml registration failed\n",
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__func__);
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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] = {
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[IFLA_CAIF_IPV4_CONNID] = { .type = NLA_U32 },
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[IFLA_CAIF_IPV6_CONNID] = { .type = NLA_U32 },
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[IFLA_CAIF_LOOPBACK] = { .type = NLA_U8 }
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};
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static struct rtnl_link_ops ipcaif_link_ops __read_mostly = {
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.kind = "caif",
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.priv_size = sizeof(struct chnl_net),
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.setup = ipcaif_net_setup,
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.maxtype = IFLA_CAIF_MAX,
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.policy = ipcaif_policy,
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.newlink = ipcaif_newlink,
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.changelink = ipcaif_changelink,
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.get_size = ipcaif_get_size,
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.fill_info = ipcaif_fill_info,
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};
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static int __init chnl_init_module(void)
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{
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return rtnl_link_register(&ipcaif_link_ops);
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}
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static void __exit chnl_exit_module(void)
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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_link_unregister(&ipcaif_link_ops);
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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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list_del(list_node);
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delete_device(dev);
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}
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rtnl_unlock();
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}
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module_init(chnl_init_module);
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module_exit(chnl_exit_module);
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