Release 4.11 net/atm/br2684.c
/*
* Ethernet netdevice using ATM AAL5 as underlying carrier
* (RFC1483 obsoleted by RFC2684) for Linux
*
* Authors: Marcell GAL, 2000, XDSL Ltd, Hungary
* Eric Kinzie, 2006-2007, US Naval Research Laboratory
*/
#define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <linux/etherdevice.h>
#include <linux/rtnetlink.h>
#include <linux/ip.h>
#include <linux/uaccess.h>
#include <linux/slab.h>
#include <net/arp.h>
#include <linux/atm.h>
#include <linux/atmdev.h>
#include <linux/capability.h>
#include <linux/seq_file.h>
#include <linux/atmbr2684.h>
#include "common.h"
static void skb_debug(const struct sk_buff *skb)
{
#ifdef SKB_DEBUG
#define NUM2PRINT 50
print_hex_dump(KERN_DEBUG, "br2684: skb: ", DUMP_OFFSET,
16, 1, skb->data, min(NUM2PRINT, skb->len), true);
#endif
}
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#define BR2684_ETHERTYPE_LEN 2
#define BR2684_PAD_LEN 2
#define LLC 0xaa, 0xaa, 0x03
#define SNAP_BRIDGED 0x00, 0x80, 0xc2
#define SNAP_ROUTED 0x00, 0x00, 0x00
#define PID_ETHERNET 0x00, 0x07
#define ETHERTYPE_IPV4 0x08, 0x00
#define ETHERTYPE_IPV6 0x86, 0xdd
#define PAD_BRIDGED 0x00, 0x00
static const unsigned char ethertype_ipv4[] = { ETHERTYPE_IPV4 };
static const unsigned char ethertype_ipv6[] = { ETHERTYPE_IPV6 };
static const unsigned char llc_oui_pid_pad[] =
{ LLC, SNAP_BRIDGED, PID_ETHERNET, PAD_BRIDGED };
static const unsigned char pad[] = { PAD_BRIDGED };
static const unsigned char llc_oui_ipv4[] = { LLC, SNAP_ROUTED, ETHERTYPE_IPV4 };
static const unsigned char llc_oui_ipv6[] = { LLC, SNAP_ROUTED, ETHERTYPE_IPV6 };
enum br2684_encaps {
e_vc = BR2684_ENCAPS_VC,
e_llc = BR2684_ENCAPS_LLC,
};
struct br2684_vcc {
struct atm_vcc *atmvcc;
struct net_device *device;
/* keep old push, pop functions for chaining */
void (*old_push)(struct atm_vcc *vcc, struct sk_buff *skb);
void (*old_pop)(struct atm_vcc *vcc, struct sk_buff *skb);
void (*old_release_cb)(struct atm_vcc *vcc);
struct module *old_owner;
enum br2684_encaps encaps;
struct list_head brvccs;
#ifdef CONFIG_ATM_BR2684_IPFILTER
struct br2684_filter filter;
#endif /* CONFIG_ATM_BR2684_IPFILTER */
unsigned int copies_needed, copies_failed;
atomic_t qspace;
};
struct br2684_dev {
struct net_device *net_dev;
struct list_head br2684_devs;
int number;
struct list_head brvccs; /* one device <=> one vcc (before xmas) */
int mac_was_set;
enum br2684_payload payload;
};
/*
* This lock should be held for writing any time the list of devices or
* their attached vcc's could be altered. It should be held for reading
* any time these are being queried. Note that we sometimes need to
* do read-locking under interrupt context, so write locking must block
* the current CPU's interrupts
*/
static DEFINE_RWLOCK(devs_lock);
static LIST_HEAD(br2684_devs);
static inline struct br2684_dev *BRPRIV(const struct net_device *net_dev)
{
return netdev_priv(net_dev);
}
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static inline struct net_device *list_entry_brdev(const struct list_head *le)
{
return list_entry(le, struct br2684_dev, br2684_devs)->net_dev;
}
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static inline struct br2684_vcc *BR2684_VCC(const struct atm_vcc *atmvcc)
{
return (struct br2684_vcc *)(atmvcc->user_back);
}
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static inline struct br2684_vcc *list_entry_brvcc(const struct list_head *le)
{
return list_entry(le, struct br2684_vcc, brvccs);
}
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Total | 26 | 100.00% | 1 | 100.00% |
/* Caller should hold read_lock(&devs_lock) */
static struct net_device *br2684_find_dev(const struct br2684_if_spec *s)
{
struct list_head *lh;
struct net_device *net_dev;
switch (s->method) {
case BR2684_FIND_BYNUM:
list_for_each(lh, &br2684_devs) {
net_dev = list_entry_brdev(lh);
if (BRPRIV(net_dev)->number == s->spec.devnum)
return net_dev;
}
break;
case BR2684_FIND_BYIFNAME:
list_for_each(lh, &br2684_devs) {
net_dev = list_entry_brdev(lh);
if (!strncmp(net_dev->name, s->spec.ifname, IFNAMSIZ))
return net_dev;
}
break;
}
return NULL;
}
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Total | 112 | 100.00% | 2 | 100.00% |
static int atm_dev_event(struct notifier_block *this, unsigned long event,
void *arg)
{
struct atm_dev *atm_dev = arg;
struct list_head *lh;
struct net_device *net_dev;
struct br2684_vcc *brvcc;
struct atm_vcc *atm_vcc;
unsigned long flags;
pr_debug("event=%ld dev=%p\n", event, atm_dev);
read_lock_irqsave(&devs_lock, flags);
list_for_each(lh, &br2684_devs) {
net_dev = list_entry_brdev(lh);
list_for_each_entry(brvcc, &BRPRIV(net_dev)->brvccs, brvccs) {
atm_vcc = brvcc->atmvcc;
if (atm_vcc && brvcc->atmvcc->dev == atm_dev) {
if (atm_vcc->dev->signal == ATM_PHY_SIG_LOST)
netif_carrier_off(net_dev);
else
netif_carrier_on(net_dev);
}
}
}
read_unlock_irqrestore(&devs_lock, flags);
return NOTIFY_DONE;
}
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static struct notifier_block atm_dev_notifier = {
.notifier_call = atm_dev_event,
};
/* chained vcc->pop function. Check if we should wake the netif_queue */
static void br2684_pop(struct atm_vcc *vcc, struct sk_buff *skb)
{
struct br2684_vcc *brvcc = BR2684_VCC(vcc);
pr_debug("(vcc %p ; net_dev %p )\n", vcc, brvcc->device);
brvcc->old_pop(vcc, skb);
/* If the queue space just went up from zero, wake */
if (atomic_inc_return(&brvcc->qspace) == 1)
netif_wake_queue(brvcc->device);
}
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David Woodhouse | 14 | 21.21% | 1 | 33.33% |
Joe Perches | 1 | 1.52% | 1 | 33.33% |
Total | 66 | 100.00% | 3 | 100.00% |
/*
* Send a packet out a particular vcc. Not to useful right now, but paves
* the way for multiple vcc's per itf. Returns true if we can send,
* otherwise false
*/
static int br2684_xmit_vcc(struct sk_buff *skb, struct net_device *dev,
struct br2684_vcc *brvcc)
{
struct br2684_dev *brdev = BRPRIV(dev);
struct atm_vcc *atmvcc;
int minheadroom = (brvcc->encaps == e_llc) ?
((brdev->payload == p_bridged) ?
sizeof(llc_oui_pid_pad) : sizeof(llc_oui_ipv4)) :
((brdev->payload == p_bridged) ? BR2684_PAD_LEN : 0);
if (skb_headroom(skb) < minheadroom) {
struct sk_buff *skb2 = skb_realloc_headroom(skb, minheadroom);
brvcc->copies_needed++;
dev_kfree_skb(skb);
if (skb2 == NULL) {
brvcc->copies_failed++;
return 0;
}
skb = skb2;
}
if (brvcc->encaps == e_llc) {
if (brdev->payload == p_bridged) {
skb_push(skb, sizeof(llc_oui_pid_pad));
skb_copy_to_linear_data(skb, llc_oui_pid_pad,
sizeof(llc_oui_pid_pad));
} else if (brdev->payload == p_routed) {
unsigned short prot = ntohs(skb->protocol);
skb_push(skb, sizeof(llc_oui_ipv4));
switch (prot) {
case ETH_P_IP:
skb_copy_to_linear_data(skb, llc_oui_ipv4,
sizeof(llc_oui_ipv4));
break;
case ETH_P_IPV6:
skb_copy_to_linear_data(skb, llc_oui_ipv6,
sizeof(llc_oui_ipv6));
break;
default:
dev_kfree_skb(skb);
return 0;
}
}
} else { /* e_vc */
if (brdev->payload == p_bridged) {
skb_push(skb, 2);
memset(skb->data, 0, 2);
}
}
skb_debug(skb);
ATM_SKB(skb)->vcc = atmvcc = brvcc->atmvcc;
pr_debug("atm_skb(%p)->vcc(%p)->dev(%p)\n", skb, atmvcc, atmvcc->dev);
atomic_add(skb->truesize, &sk_atm(atmvcc)->sk_wmem_alloc);
ATM_SKB(skb)->atm_options = atmvcc->atm_options;
dev->stats.tx_packets++;
dev->stats.tx_bytes += skb->len;
if (atomic_dec_return(&brvcc->qspace) < 1) {
/* No more please! */
netif_stop_queue(brvcc->device);
/* We might have raced with br2684_pop() */
if (unlikely(atomic_read(&brvcc->qspace) > 0))
netif_wake_queue(brvcc->device);
}
/* If this fails immediately, the skb will be freed and br2684_pop()
will wake the queue if appropriate. Just return an error so that
the stats are updated correctly */
return !atmvcc->send(atmvcc, skb);
}
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Chas Williams | 188 | 44.98% | 1 | 9.09% |
Eric Kinzie | 123 | 29.43% | 2 | 18.18% |
Pascal Hambourg | 32 | 7.66% | 1 | 9.09% |
David Woodhouse | 29 | 6.94% | 1 | 9.09% |
Karl Hiramoto | 26 | 6.22% | 1 | 9.09% |
Stephen Hemminger | 15 | 3.59% | 2 | 18.18% |
Arnaldo Carvalho de Melo | 5 | 1.20% | 3 | 27.27% |
Total | 418 | 100.00% | 11 | 100.00% |
static void br2684_release_cb(struct atm_vcc *atmvcc)
{
struct br2684_vcc *brvcc = BR2684_VCC(atmvcc);
if (atomic_read(&brvcc->qspace) > 0)
netif_wake_queue(brvcc->device);
if (brvcc->old_release_cb)
brvcc->old_release_cb(atmvcc);
}
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David Woodhouse | 53 | 100.00% | 1 | 100.00% |
Total | 53 | 100.00% | 1 | 100.00% |
static inline struct br2684_vcc *pick_outgoing_vcc(const struct sk_buff *skb,
const struct br2684_dev *brdev)
{
return list_empty(&brdev->brvccs) ? NULL : list_entry_brvcc(brdev->brvccs.next); /* 1 vcc/dev right now */
}
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Mitchell Blank Jr. | 2 | 4.76% | 1 | 50.00% |
Total | 42 | 100.00% | 2 | 100.00% |
static netdev_tx_t br2684_start_xmit(struct sk_buff *skb,
struct net_device *dev)
{
struct br2684_dev *brdev = BRPRIV(dev);
struct br2684_vcc *brvcc;
struct atm_vcc *atmvcc;
netdev_tx_t ret = NETDEV_TX_OK;
pr_debug("skb_dst(skb)=%p\n", skb_dst(skb));
read_lock(&devs_lock);
brvcc = pick_outgoing_vcc(skb, brdev);
if (brvcc == NULL) {
pr_debug("no vcc attached to dev %s\n", dev->name);
dev->stats.tx_errors++;
dev->stats.tx_carrier_errors++;
/* netif_stop_queue(dev); */
dev_kfree_skb(skb);
goto out_devs;
}
atmvcc = brvcc->atmvcc;
bh_lock_sock(sk_atm(atmvcc));
if (test_bit(ATM_VF_RELEASED, &atmvcc->flags) ||
test_bit(ATM_VF_CLOSE, &atmvcc->flags) ||
!test_bit(ATM_VF_READY, &atmvcc->flags)) {
dev->stats.tx_dropped++;
dev_kfree_skb(skb);
goto out;
}
if (sock_owned_by_user(sk_atm(atmvcc))) {
netif_stop_queue(brvcc->device);
ret = NETDEV_TX_BUSY;
goto out;
}
if (!br2684_xmit_vcc(skb, dev, brvcc)) {
/*
* We should probably use netif_*_queue() here, but that
* involves added complication. We need to walk before
* we can run.
*
* Don't free here! this pointer might be no longer valid!
*/
dev->stats.tx_errors++;
dev->stats.tx_fifo_errors++;
}
out:
bh_unlock_sock(sk_atm(atmvcc));
out_devs:
read_unlock(&devs_lock);
return ret;
}
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Chas Williams | 122 | 49.59% | 2 | 25.00% |
David Woodhouse | 112 | 45.53% | 1 | 12.50% |
Stephen Hemminger | 8 | 3.25% | 3 | 37.50% |
Eric Dumazet | 3 | 1.22% | 1 | 12.50% |
Joe Perches | 1 | 0.41% | 1 | 12.50% |
Total | 246 | 100.00% | 8 | 100.00% |
/*
* We remember when the MAC gets set, so we don't override it later with
* the ESI of the ATM card of the first VC
*/
static int br2684_mac_addr(struct net_device *dev, void *p)
{
int err = eth_mac_addr(dev, p);
if (!err)
BRPRIV(dev)->mac_was_set = 1;
return err;
}
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Chas Williams | 41 | 97.62% | 1 | 50.00% |
Stephen Hemminger | 1 | 2.38% | 1 | 50.00% |
Total | 42 | 100.00% | 2 | 100.00% |
#ifdef CONFIG_ATM_BR2684_IPFILTER
/* this IOCTL is experimental. */
static int br2684_setfilt(struct atm_vcc *atmvcc, void __user * arg)
{
struct br2684_vcc *brvcc;
struct br2684_filter_set fs;
if (copy_from_user(&fs, arg, sizeof fs))
return -EFAULT;
if (fs.ifspec.method != BR2684_FIND_BYNOTHING) {
/*
* This is really a per-vcc thing, but we can also search
* by device.
*/
struct br2684_dev *brdev;
read_lock(&devs_lock);
brdev = BRPRIV(br2684_find_dev(&fs.ifspec));
if (brdev == NULL || list_empty(&brdev->brvccs) ||
brdev->brvccs.next != brdev->brvccs.prev) /* >1 VCC */
brvcc = NULL;
else
brvcc = list_entry_brvcc(brdev->brvccs.next);
read_unlock(&devs_lock);
if (brvcc == NULL)
return -ESRCH;
} else
brvcc = BR2684_VCC(atmvcc);
memcpy(&brvcc->filter, &fs.filter, sizeof(brvcc->filter));
return 0;
}
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Chas Williams | 166 | 98.22% | 3 | 75.00% |
Al Viro | 3 | 1.78% | 1 | 25.00% |
Total | 169 | 100.00% | 4 | 100.00% |
/* Returns 1 if packet should be dropped */
static inline int
packet_fails_filter(__be16 type, struct br2684_vcc *brvcc, struct sk_buff *skb)
{
if (brvcc->filter.netmask == 0)
return 0; /* no filter in place */
if (type == htons(ETH_P_IP) &&
(((struct iphdr *)(skb->data))->daddr & brvcc->filter.
netmask) == brvcc->filter.prefix)
return 0;
if (type == htons(ETH_P_ARP))
return 0;
/*
* TODO: we should probably filter ARPs too.. don't want to have
* them returning values that don't make sense, or is that ok?
*/
return 1; /* drop */
}
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Chas Williams | 89 | 96.74% | 2 | 50.00% |
Hideaki Yoshifuji / 吉藤英明 | 2 | 2.17% | 1 | 25.00% |
Al Viro | 1 | 1.09% | 1 | 25.00% |
Total | 92 | 100.00% | 4 | 100.00% |
#endif /* CONFIG_ATM_BR2684_IPFILTER */
static void br2684_close_vcc(struct br2684_vcc *brvcc)
{
pr_debug("removing VCC %p from dev %p\n", brvcc, brvcc->device);
write_lock_irq(&devs_lock);
list_del(&brvcc->brvccs);
write_unlock_irq(&devs_lock);
brvcc->atmvcc->user_back = NULL; /* what about vcc->recvq ??? */
brvcc->atmvcc->release_cb = brvcc->old_release_cb;
brvcc->old_push(brvcc->atmvcc, NULL); /* pass on the bad news */
module_put(brvcc->old_owner);
kfree(brvcc);
}
Contributors
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Chas Williams | 69 | 81.18% | 2 | 40.00% |
David Woodhouse | 15 | 17.65% | 2 | 40.00% |
Stephen Hemminger | 1 | 1.18% | 1 | 20.00% |
Total | 85 | 100.00% | 5 | 100.00% |
/* when AAL5 PDU comes in: */
static void br2684_push(struct atm_vcc *atmvcc, struct sk_buff *skb)
{
struct br2684_vcc *brvcc = BR2684_VCC(atmvcc);
struct net_device *net_dev = brvcc->device;
struct br2684_dev *brdev = BRPRIV(net_dev);
pr_debug("\n");
if (unlikely(skb == NULL)) {
/* skb==NULL means VCC is being destroyed */
br2684_close_vcc(brvcc);
if (list_empty(&brdev->brvccs)) {
write_lock_irq(&devs_lock);
list_del(&brdev->br2684_devs);
write_unlock_irq(&devs_lock);
unregister_netdev(net_dev);
free_netdev(net_dev);
}
return;
}
skb_debug(skb);
atm_return(atmvcc, skb->truesize);
pr_debug("skb from brdev %p\n", brdev);
if (brvcc->encaps == e_llc) {
if (skb->len > 7 && skb->data[7] == 0x01)
__skb_trim(skb, skb->len - 4);
/* accept packets that have "ipv[46]" in the snap header */
if ((skb->len >= (sizeof(llc_oui_ipv4))) &&
(memcmp(skb->data, llc_oui_ipv4,
sizeof(llc_oui_ipv4) - BR2684_ETHERTYPE_LEN) == 0)) {
if (memcmp(skb->data + 6, ethertype_ipv6,
sizeof(ethertype_ipv6)) == 0)
skb->protocol = htons(ETH_P_IPV6);
else if (memcmp(skb->data + 6, ethertype_ipv4,
sizeof(ethertype_ipv4)) == 0)
skb->protocol = htons(ETH_P_IP);
else
goto error;
skb_pull(skb, sizeof(llc_oui_ipv4));
skb_reset_network_header(skb);
skb->pkt_type = PACKET_HOST;
/*
* Let us waste some time for checking the encapsulation.
* Note, that only 7 char is checked so frames with a valid FCS
* are also accepted (but FCS is not checked of course).
*/
} else if ((skb->len >= sizeof(llc_oui_pid_pad)) &&
(memcmp(skb->data, llc_oui_pid_pad, 7) == 0)) {
skb_pull(skb, sizeof(llc_oui_pid_pad));
skb->protocol = eth_type_trans(skb, net_dev);
} else
goto error;
} else { /* e_vc */
if (brdev->payload == p_routed) {
struct iphdr *iph;
skb_reset_network_header(skb);
iph = ip_hdr(skb);
if (iph->version == 4)
skb->protocol = htons(ETH_P_IP);
else if (iph->version == 6)
skb->protocol = htons(ETH_P_IPV6);
else
goto error;
skb->pkt_type = PACKET_HOST;
} else { /* p_bridged */
/* first 2 chars should be 0 */
if (memcmp(skb->data, pad, BR2684_PAD_LEN) != 0)
goto error;
skb_pull(skb, BR2684_PAD_LEN);
skb->protocol = eth_type_trans(skb, net_dev);
}
}
#ifdef CONFIG_ATM_BR2684_IPFILTER
if (unlikely(packet_fails_filter(skb->protocol, brvcc, skb)))
goto dropped;
#endif /* CONFIG_ATM_BR2684_IPFILTER */
skb->dev = net_dev;
ATM_SKB(skb)->vcc = atmvcc; /* needed ? */
pr_debug("received packet's protocol: %x\n", ntohs(skb->protocol));
skb_debug(skb);
/* sigh, interface is down? */
if (unlikely(!(net_dev->flags & IFF_UP)))
goto dropped;
net_dev->stats.rx_packets++;
net_dev->stats.rx_bytes += skb->len;
memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
netif_rx(skb);
return;
dropped:
net_dev->stats.rx_dropped++;
goto free_skb;
error:
net_dev->stats.rx_errors++;
free_skb:
dev_kfree_skb(skb);
}
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Eric Kinzie | 293 | 48.19% | 2 | 14.29% |
Chas Williams | 288 | 47.37% | 4 | 28.57% |
Stephen Hemminger | 7 | 1.15% | 2 | 14.29% |
Pascal Hambourg | 7 | 1.15% | 1 | 7.14% |
David S. Miller | 5 | 0.82% | 1 | 7.14% |
Arnaldo Carvalho de Melo | 4 | 0.66% | 1 | 7.14% |
Pavel Emelyanov | 2 | 0.33% | 1 | 7.14% |
Joe Perches | 2 | 0.33% | 2 | 14.29% |
Total | 608 | 100.00% | 14 | 100.00% |
/*
* Assign a vcc to a dev
* Note: we do not have explicit unassign, but look at _push()
*/
static int br2684_regvcc(struct atm_vcc *atmvcc, void __user * arg)
{
struct br2684_vcc *brvcc;
struct br2684_dev *brdev;
struct net_device *net_dev;
struct atm_backend_br2684 be;
int err;
if (copy_from_user(&be, arg, sizeof be))
return -EFAULT;
brvcc = kzalloc(sizeof(struct br2684_vcc), GFP_KERNEL);
if (!brvcc)
return -ENOMEM;
/*
* Allow two packets in the ATM queue. One actually being sent, and one
* for the ATM 'TX done' handler to send. It shouldn't take long to get
* the next one from the netdev queue, when we need it. More than that
* would be bufferbloat.
*/
atomic_set(&brvcc->qspace, 2);
write_lock_irq(&devs_lock);
net_dev = br2684_find_dev(&be.ifspec);
if (net_dev == NULL) {
pr_err("tried to attach to non-existent device\n");
err = -ENXIO;
goto error;
}
brdev = BRPRIV(net_dev);
if (atmvcc->push == NULL) {
err = -EBADFD;
goto error;
}
if (!list_empty(&brdev->brvccs)) {
/* Only 1 VCC/dev right now */
err = -EEXIST;
goto error;
}
if (be.fcs_in != BR2684_FCSIN_NO ||
be.fcs_out != BR2684_FCSOUT_NO ||
be.fcs_auto || be.has_vpiid || be.send_padding ||
(be.encaps != BR2684_ENCAPS_VC &&
be.encaps != BR2684_ENCAPS_LLC) ||
be.min_size != 0) {
err = -EINVAL;
goto error;
}
pr_debug("vcc=%p, encaps=%d, brvcc=%p\n", atmvcc, be.encaps, brvcc);
if (list_empty(&brdev->brvccs) && !brdev->mac_was_set) {
unsigned char *esi = atmvcc->dev->esi;
if (esi[0] | esi[1] | esi[2] | esi[3] | esi[4] | esi[5])
memcpy(net_dev->dev_addr, esi, net_dev->addr_len);
else
net_dev->dev_addr[2] = 1;
}
list_add(&brvcc->brvccs, &brdev->brvccs);
write_unlock_irq(&devs_lock);
brvcc->device = net_dev;
brvcc->atmvcc = atmvcc;
atmvcc->user_back = brvcc;
brvcc->encaps = (enum br2684_encaps)be.encaps;
brvcc->old_push = atmvcc->push;
brvcc->old_pop = atmvcc->pop;
brvcc->old_release_cb = atmvcc->release_cb;
brvcc->old_owner = atmvcc->owner;
barrier();
atmvcc->push = br2684_push;
atmvcc->pop = br2684_pop;
atmvcc->release_cb = br2684_release_cb;
atmvcc->owner = THIS_MODULE;
/* initialize netdev carrier state */
if (atmvcc->dev->signal == ATM_PHY_SIG_LOST)