![Sjur Braendeland](/assets/img/avatar_default.png)
Check that receive function pointer is not null before calling it. Signed-off-by: Sjur Braendeland <sjur.brandeland@stericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
422 lines
9.8 KiB
C
422 lines
9.8 KiB
C
/*
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* CAIF Interface registration.
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* Copyright (C) ST-Ericsson AB 2010
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* Author: Sjur Brendeland/sjur.brandeland@stericsson.com
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* License terms: GNU General Public License (GPL) version 2
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*
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* Borrowed heavily from file: pn_dev.c. Thanks to
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* Remi Denis-Courmont <remi.denis-courmont@nokia.com>
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* and Sakari Ailus <sakari.ailus@nokia.com>
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ":%s(): " fmt, __func__
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#include <linux/version.h>
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/if_arp.h>
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#include <linux/net.h>
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#include <linux/netdevice.h>
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#include <linux/skbuff.h>
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#include <linux/sched.h>
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#include <linux/wait.h>
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#include <net/netns/generic.h>
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#include <net/net_namespace.h>
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#include <net/pkt_sched.h>
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#include <net/caif/caif_device.h>
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#include <net/caif/caif_dev.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/cfcnfg.h>
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MODULE_LICENSE("GPL");
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#define TIMEOUT (HZ*5)
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/* Used for local tracking of the CAIF net devices */
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struct caif_device_entry {
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struct cflayer layer;
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struct list_head list;
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atomic_t in_use;
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atomic_t state;
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u16 phyid;
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struct net_device *netdev;
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wait_queue_head_t event;
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};
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struct caif_device_entry_list {
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struct list_head list;
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/* Protects simulanous deletes in list */
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spinlock_t lock;
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};
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struct caif_net {
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struct caif_device_entry_list caifdevs;
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};
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static int caif_net_id;
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static struct cfcnfg *cfg;
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static struct caif_device_entry_list *caif_device_list(struct net *net)
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{
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struct caif_net *caifn;
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BUG_ON(!net);
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caifn = net_generic(net, caif_net_id);
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BUG_ON(!caifn);
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return &caifn->caifdevs;
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}
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/* Allocate new CAIF device. */
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static struct caif_device_entry *caif_device_alloc(struct net_device *dev)
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{
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struct caif_device_entry_list *caifdevs;
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struct caif_device_entry *caifd;
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caifdevs = caif_device_list(dev_net(dev));
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BUG_ON(!caifdevs);
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caifd = kzalloc(sizeof(*caifd), GFP_ATOMIC);
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if (!caifd)
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return NULL;
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caifd->netdev = dev;
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list_add(&caifd->list, &caifdevs->list);
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init_waitqueue_head(&caifd->event);
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return caifd;
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}
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static struct caif_device_entry *caif_get(struct net_device *dev)
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{
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struct caif_device_entry_list *caifdevs =
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caif_device_list(dev_net(dev));
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struct caif_device_entry *caifd;
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BUG_ON(!caifdevs);
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list_for_each_entry(caifd, &caifdevs->list, list) {
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if (caifd->netdev == dev)
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return caifd;
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}
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return NULL;
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}
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static void caif_device_destroy(struct net_device *dev)
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{
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struct caif_device_entry_list *caifdevs =
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caif_device_list(dev_net(dev));
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struct caif_device_entry *caifd;
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ASSERT_RTNL();
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if (dev->type != ARPHRD_CAIF)
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return;
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spin_lock_bh(&caifdevs->lock);
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caifd = caif_get(dev);
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if (caifd == NULL) {
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spin_unlock_bh(&caifdevs->lock);
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return;
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}
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list_del(&caifd->list);
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spin_unlock_bh(&caifdevs->lock);
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kfree(caifd);
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}
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static int transmit(struct cflayer *layer, struct cfpkt *pkt)
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{
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struct caif_device_entry *caifd =
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container_of(layer, struct caif_device_entry, layer);
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struct sk_buff *skb, *skb2;
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int ret = -EINVAL;
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skb = cfpkt_tonative(pkt);
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skb->dev = caifd->netdev;
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/*
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* Don't allow SKB to be destroyed upon error, but signal resend
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* notification to clients. We can't rely on the return value as
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* congestion (NET_XMIT_CN) sometimes drops the packet, sometimes don't.
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*/
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if (netif_queue_stopped(caifd->netdev))
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return -EAGAIN;
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skb2 = skb_get(skb);
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ret = dev_queue_xmit(skb2);
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if (!ret)
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kfree_skb(skb);
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else
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return -EAGAIN;
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return 0;
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}
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static int modemcmd(struct cflayer *layr, enum caif_modemcmd ctrl)
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{
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struct caif_device_entry *caifd;
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struct caif_dev_common *caifdev;
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caifd = container_of(layr, struct caif_device_entry, layer);
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caifdev = netdev_priv(caifd->netdev);
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if (ctrl == _CAIF_MODEMCMD_PHYIF_USEFULL) {
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atomic_set(&caifd->in_use, 1);
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wake_up_interruptible(&caifd->event);
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} else if (ctrl == _CAIF_MODEMCMD_PHYIF_USELESS) {
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atomic_set(&caifd->in_use, 0);
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wake_up_interruptible(&caifd->event);
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}
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return 0;
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}
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/*
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* Stuff received packets to associated sockets.
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* On error, returns non-zero and releases the skb.
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*/
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static int receive(struct sk_buff *skb, struct net_device *dev,
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struct packet_type *pkttype, struct net_device *orig_dev)
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{
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struct net *net;
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struct cfpkt *pkt;
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struct caif_device_entry *caifd;
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net = dev_net(dev);
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pkt = cfpkt_fromnative(CAIF_DIR_IN, skb);
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caifd = caif_get(dev);
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if (!caifd || !caifd->layer.up || !caifd->layer.up->receive)
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return NET_RX_DROP;
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if (caifd->layer.up->receive(caifd->layer.up, pkt))
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return NET_RX_DROP;
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return 0;
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}
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static struct packet_type caif_packet_type __read_mostly = {
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.type = cpu_to_be16(ETH_P_CAIF),
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.func = receive,
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};
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static void dev_flowctrl(struct net_device *dev, int on)
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{
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struct caif_device_entry *caifd = caif_get(dev);
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if (!caifd || !caifd->layer.up || !caifd->layer.up->ctrlcmd)
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return;
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caifd->layer.up->ctrlcmd(caifd->layer.up,
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on ?
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_CAIF_CTRLCMD_PHYIF_FLOW_ON_IND :
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_CAIF_CTRLCMD_PHYIF_FLOW_OFF_IND,
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caifd->layer.id);
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}
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/* notify Caif of device events */
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static int caif_device_notify(struct notifier_block *me, unsigned long what,
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void *arg)
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{
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struct net_device *dev = arg;
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struct caif_device_entry *caifd = NULL;
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struct caif_dev_common *caifdev;
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enum cfcnfg_phy_preference pref;
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int res = -EINVAL;
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enum cfcnfg_phy_type phy_type;
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if (dev->type != ARPHRD_CAIF)
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return 0;
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switch (what) {
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case NETDEV_REGISTER:
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netdev_info(dev, "register\n");
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caifd = caif_device_alloc(dev);
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if (caifd == NULL)
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break;
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caifdev = netdev_priv(dev);
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caifdev->flowctrl = dev_flowctrl;
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atomic_set(&caifd->state, what);
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res = 0;
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break;
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case NETDEV_UP:
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netdev_info(dev, "up\n");
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caifd = caif_get(dev);
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if (caifd == NULL)
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break;
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caifdev = netdev_priv(dev);
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if (atomic_read(&caifd->state) == NETDEV_UP) {
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netdev_info(dev, "already up\n");
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break;
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}
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atomic_set(&caifd->state, what);
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caifd->layer.transmit = transmit;
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caifd->layer.modemcmd = modemcmd;
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if (caifdev->use_frag)
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phy_type = CFPHYTYPE_FRAG;
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else
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phy_type = CFPHYTYPE_CAIF;
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switch (caifdev->link_select) {
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case CAIF_LINK_HIGH_BANDW:
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pref = CFPHYPREF_HIGH_BW;
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break;
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case CAIF_LINK_LOW_LATENCY:
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pref = CFPHYPREF_LOW_LAT;
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break;
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default:
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pref = CFPHYPREF_HIGH_BW;
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break;
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}
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dev_hold(dev);
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cfcnfg_add_phy_layer(get_caif_conf(),
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phy_type,
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dev,
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&caifd->layer,
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&caifd->phyid,
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pref,
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caifdev->use_fcs,
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caifdev->use_stx);
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strncpy(caifd->layer.name, dev->name,
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sizeof(caifd->layer.name) - 1);
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caifd->layer.name[sizeof(caifd->layer.name) - 1] = 0;
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break;
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case NETDEV_GOING_DOWN:
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caifd = caif_get(dev);
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if (caifd == NULL)
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break;
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netdev_info(dev, "going down\n");
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if (atomic_read(&caifd->state) == NETDEV_GOING_DOWN ||
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atomic_read(&caifd->state) == NETDEV_DOWN)
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break;
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atomic_set(&caifd->state, what);
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if (!caifd || !caifd->layer.up || !caifd->layer.up->ctrlcmd)
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return -EINVAL;
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caifd->layer.up->ctrlcmd(caifd->layer.up,
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_CAIF_CTRLCMD_PHYIF_DOWN_IND,
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caifd->layer.id);
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might_sleep();
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res = wait_event_interruptible_timeout(caifd->event,
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atomic_read(&caifd->in_use) == 0,
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TIMEOUT);
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break;
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case NETDEV_DOWN:
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caifd = caif_get(dev);
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if (caifd == NULL)
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break;
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netdev_info(dev, "down\n");
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if (atomic_read(&caifd->in_use))
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netdev_warn(dev,
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"Unregistering an active CAIF device\n");
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cfcnfg_del_phy_layer(get_caif_conf(), &caifd->layer);
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dev_put(dev);
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atomic_set(&caifd->state, what);
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break;
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case NETDEV_UNREGISTER:
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caifd = caif_get(dev);
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netdev_info(dev, "unregister\n");
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atomic_set(&caifd->state, what);
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caif_device_destroy(dev);
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break;
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}
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return 0;
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}
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static struct notifier_block caif_device_notifier = {
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.notifier_call = caif_device_notify,
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.priority = 0,
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};
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struct cfcnfg *get_caif_conf(void)
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{
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return cfg;
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}
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EXPORT_SYMBOL(get_caif_conf);
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int caif_connect_client(struct caif_connect_request *conn_req,
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struct cflayer *client_layer, int *ifindex,
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int *headroom, int *tailroom)
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{
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struct cfctrl_link_param param;
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int ret;
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ret = connect_req_to_link_param(get_caif_conf(), conn_req, ¶m);
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if (ret)
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return ret;
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/* Hook up the adaptation layer. */
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return cfcnfg_add_adaptation_layer(get_caif_conf(), ¶m,
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client_layer, ifindex,
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headroom, tailroom);
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}
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EXPORT_SYMBOL(caif_connect_client);
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int caif_disconnect_client(struct cflayer *adap_layer)
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{
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return cfcnfg_disconn_adapt_layer(get_caif_conf(), adap_layer);
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}
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EXPORT_SYMBOL(caif_disconnect_client);
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void caif_release_client(struct cflayer *adap_layer)
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{
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cfcnfg_release_adap_layer(adap_layer);
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}
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EXPORT_SYMBOL(caif_release_client);
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/* Per-namespace Caif devices handling */
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static int caif_init_net(struct net *net)
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{
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struct caif_net *caifn = net_generic(net, caif_net_id);
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INIT_LIST_HEAD(&caifn->caifdevs.list);
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spin_lock_init(&caifn->caifdevs.lock);
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return 0;
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}
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static void caif_exit_net(struct net *net)
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{
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struct net_device *dev;
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int res;
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rtnl_lock();
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for_each_netdev(net, dev) {
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if (dev->type != ARPHRD_CAIF)
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continue;
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res = dev_close(dev);
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caif_device_destroy(dev);
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}
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rtnl_unlock();
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}
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static struct pernet_operations caif_net_ops = {
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.init = caif_init_net,
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.exit = caif_exit_net,
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.id = &caif_net_id,
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.size = sizeof(struct caif_net),
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};
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/* Initialize Caif devices list */
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static int __init caif_device_init(void)
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{
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int result;
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cfg = cfcnfg_create();
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if (!cfg) {
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pr_warn("can't create cfcnfg\n");
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goto err_cfcnfg_create_failed;
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}
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result = register_pernet_device(&caif_net_ops);
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if (result) {
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kfree(cfg);
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cfg = NULL;
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return result;
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}
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dev_add_pack(&caif_packet_type);
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register_netdevice_notifier(&caif_device_notifier);
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return result;
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err_cfcnfg_create_failed:
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return -ENODEV;
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}
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static void __exit caif_device_exit(void)
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{
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dev_remove_pack(&caif_packet_type);
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unregister_pernet_device(&caif_net_ops);
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unregister_netdevice_notifier(&caif_device_notifier);
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cfcnfg_remove(cfg);
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}
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module_init(caif_device_init);
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module_exit(caif_device_exit);
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