diff options
Diffstat (limited to 'release/src/linux/linux/drivers/net/imq.c')
| -rw-r--r-- | release/src/linux/linux/drivers/net/imq.c | 321 |
1 files changed, 321 insertions, 0 deletions
diff --git a/release/src/linux/linux/drivers/net/imq.c b/release/src/linux/linux/drivers/net/imq.c new file mode 100644 index 00000000..ac687dba --- /dev/null +++ b/release/src/linux/linux/drivers/net/imq.c @@ -0,0 +1,321 @@ +/* + * Pseudo-driver for the intermediate queue device. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + * + * Authors: Patrick McHardy, <kaber@trash.net> + * + * The first version was written by Martin Devera, <devik@cdi.cz> + * + * Credits: Jan Rafaj <imq2t@cedric.vabo.cz> + * - Update patch to 2.4.21 + * Sebastian Strollo <sstrollo@nortelnetworks.com> + * - Fix "Dead-loop on netdevice imq"-issue + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/config.h> +#include <linux/skbuff.h> +#include <linux/netdevice.h> +#include <linux/rtnetlink.h> +#include <linux/if_arp.h> +#include <linux/netfilter.h> +#include <linux/netfilter_ipv4.h> +#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) +#include <linux/netfilter_ipv6.h> +#endif +#include <linux/imq.h> +#include <net/pkt_sched.h> + +static nf_hookfn imq_nf_hook; + +static struct nf_hook_ops imq_ingress_ipv4 = { + { NULL, NULL}, + imq_nf_hook, + PF_INET, + NF_IP_PRE_ROUTING, + NF_IP_PRI_MANGLE + 1 +}; + +static struct nf_hook_ops imq_egress_ipv4 = { + { NULL, NULL}, + imq_nf_hook, + PF_INET, + NF_IP_POST_ROUTING, + NF_IP_PRI_LAST +}; + +#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) +static struct nf_hook_ops imq_ingress_ipv6 = { + { NULL, NULL}, + imq_nf_hook, + PF_INET6, + NF_IP6_PRE_ROUTING, + NF_IP6_PRI_MANGLE + 1 +}; + +static struct nf_hook_ops imq_egress_ipv6 = { + { NULL, NULL}, + imq_nf_hook, + PF_INET6, + NF_IP6_POST_ROUTING, + NF_IP6_PRI_LAST +}; +#endif + +static unsigned int numdevs = 2; + +MODULE_PARM(numdevs, "i"); +MODULE_PARM_DESC(numdevs, "number of imq devices"); + +static struct net_device *imq_devs; + + +static struct net_device_stats *imq_get_stats(struct net_device *dev) +{ + return (struct net_device_stats *)dev->priv; +} + +/* called for packets kfree'd in qdiscs at places other than enqueue */ +static void imq_skb_destructor(struct sk_buff *skb) +{ + struct nf_info *info = skb->nf_info; + + if (info) { + if (info->indev) + dev_put(info->indev); + if (info->outdev) + dev_put(info->outdev); + kfree(info); + } +} + +static int imq_dev_xmit(struct sk_buff *skb, struct net_device *dev) +{ + struct net_device_stats *stats = (struct net_device_stats*) dev->priv; + + stats->tx_bytes += skb->len; + stats->tx_packets++; + + skb->imq_flags = 0; + skb->destructor = NULL; + + dev->trans_start = jiffies; + nf_reinject(skb, skb->nf_info, NF_ACCEPT); + return 0; +} + +static int imq_nf_queue(struct sk_buff *skb, struct nf_info *info, + void *data) +{ + struct net_device *dev; + struct net_device_stats *stats; + struct sk_buff *skb2 = NULL; + struct Qdisc *q; + unsigned int index = skb->imq_flags&IMQ_F_IFMASK; + int ret = -1; + + if (index > numdevs) + return -1; + + dev = imq_devs + index; + if (!(dev->flags & IFF_UP)) { + skb->imq_flags = 0; + nf_reinject(skb, info, NF_ACCEPT); + return 0; + } + dev->last_rx = jiffies; + + if (skb->destructor) { + skb2 = skb; + skb = skb_clone(skb, GFP_ATOMIC); + if (!skb) + return -1; + } + skb->nf_info = info; + + stats = (struct net_device_stats *)dev->priv; + stats->rx_bytes+= skb->len; + stats->rx_packets++; + + spin_lock_bh(&dev->queue_lock); + q = dev->qdisc; + if (q->enqueue) { + q->enqueue(skb_get(skb), q); + if (skb_shared(skb)) { + skb->destructor = imq_skb_destructor; + kfree_skb(skb); + ret = 0; + } + } + if (spin_is_locked(&dev->xmit_lock)) + netif_schedule(dev); + else + qdisc_run(dev); + spin_unlock_bh(&dev->queue_lock); + + if (skb2) + kfree_skb(ret ? skb : skb2); + + return ret; +} + +static unsigned int imq_nf_hook(unsigned int hook, struct sk_buff **pskb, + const struct net_device *indev, + const struct net_device *outdev, + int (*okfn)(struct sk_buff *)) +{ + if ((*pskb)->imq_flags & IMQ_F_ENQUEUE) + return NF_QUEUE; + + return NF_ACCEPT; +} + + +static int __init imq_init_hooks(void) +{ + int err; + + if ((err = nf_register_queue_handler(PF_INET, imq_nf_queue, NULL))) + goto err1; + if ((err = nf_register_hook(&imq_ingress_ipv4))) + goto err2; + if ((err = nf_register_hook(&imq_egress_ipv4))) + goto err3; +#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) + if ((err = nf_register_queue_handler(PF_INET6, imq_nf_queue, NULL))) + goto err4; + if ((err = nf_register_hook(&imq_ingress_ipv6))) + goto err5; + if ((err = nf_register_hook(&imq_egress_ipv6))) + goto err6; +#endif + + return 0; + +#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) +err6: + nf_unregister_hook(&imq_ingress_ipv6); +err5: + nf_unregister_queue_handler(PF_INET6); +err4: + nf_unregister_hook(&imq_egress_ipv4); +#endif +err3: + nf_unregister_hook(&imq_ingress_ipv4); +err2: + nf_unregister_queue_handler(PF_INET); +err1: + return err; +} + +static void __exit imq_unhook(void) +{ + nf_unregister_hook(&imq_ingress_ipv4); + nf_unregister_hook(&imq_egress_ipv4); + nf_unregister_queue_handler(PF_INET); +#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) + nf_unregister_hook(&imq_ingress_ipv6); + nf_unregister_hook(&imq_egress_ipv6); + nf_unregister_queue_handler(PF_INET6); +#endif +} + +static int __init imq_dev_init(struct net_device *dev) +{ + dev->hard_start_xmit = imq_dev_xmit; + dev->type = ARPHRD_VOID; + dev->mtu = 1500; + dev->tx_queue_len = 30; + dev->flags = IFF_NOARP; + dev->priv = kmalloc(sizeof(struct net_device_stats), GFP_KERNEL); + if (dev->priv == NULL) + return -ENOMEM; + memset(dev->priv, 0, sizeof(struct net_device_stats)); + dev->get_stats = imq_get_stats; + + return 0; +} + +static void imq_dev_uninit(struct net_device *dev) +{ + kfree(dev->priv); +} + +static int __init imq_init_devs(void) +{ + struct net_device *dev; + int i; + + if (!numdevs || numdevs > IMQ_MAX_DEVS) { + printk(KERN_ERR "numdevs has to be betweed 1 and %u\n", + IMQ_MAX_DEVS); + return -EINVAL; + } + + imq_devs = kmalloc(sizeof(struct net_device) * numdevs, GFP_KERNEL); + if (!imq_devs) + return -ENOMEM; + memset(imq_devs, 0, sizeof(struct net_device) * numdevs); + + /* we start counting at zero */ + numdevs--; + + for (i = 0, dev = imq_devs; i <= numdevs; i++, dev++) { + SET_MODULE_OWNER(dev); + strcpy(dev->name, "imq%d"); + dev->init = imq_dev_init; + dev->uninit = imq_dev_uninit; + + if (register_netdev(dev) < 0) + goto err_register; + } + return 0; + +err_register: + for (; i; i--) + unregister_netdev(--dev); + kfree(imq_devs); + return -EIO; +} + +static void imq_cleanup_devs(void) +{ + int i; + struct net_device *dev = imq_devs; + + for (i = 0; i <= numdevs; i++) + unregister_netdev(dev++); + + kfree(imq_devs); +} + +static int __init imq_init_module(void) +{ + int err; + + if ((err = imq_init_devs())) + return err; + if ((err = imq_init_hooks())) { + imq_cleanup_devs(); + return err; + } + + printk(KERN_INFO "imq driver loaded.\n"); + + return 0; +} + +static void __exit imq_cleanup_module(void) +{ + imq_unhook(); + imq_cleanup_devs(); +} + +module_init(imq_init_module); +module_exit(imq_cleanup_module); +MODULE_LICENSE("GPL"); |