2005-04-16 22:20:36 +00:00
|
|
|
/*
|
|
|
|
* Common framework for low-level network console, dump, and debugger code
|
|
|
|
*
|
|
|
|
* Sep 8 2003 Matt Mackall <mpm@selenic.com>
|
|
|
|
*
|
|
|
|
* based on the netconsole code from:
|
|
|
|
*
|
|
|
|
* Copyright (C) 2001 Ingo Molnar <mingo@redhat.com>
|
|
|
|
* Copyright (C) 2002 Red Hat, Inc.
|
|
|
|
*/
|
|
|
|
|
|
|
|
#include <linux/smp_lock.h>
|
|
|
|
#include <linux/netdevice.h>
|
|
|
|
#include <linux/etherdevice.h>
|
|
|
|
#include <linux/string.h>
|
2005-12-27 04:43:12 +00:00
|
|
|
#include <linux/if_arp.h>
|
2005-04-16 22:20:36 +00:00
|
|
|
#include <linux/inetdevice.h>
|
|
|
|
#include <linux/inet.h>
|
|
|
|
#include <linux/interrupt.h>
|
|
|
|
#include <linux/netpoll.h>
|
|
|
|
#include <linux/sched.h>
|
|
|
|
#include <linux/delay.h>
|
|
|
|
#include <linux/rcupdate.h>
|
|
|
|
#include <linux/workqueue.h>
|
|
|
|
#include <net/tcp.h>
|
|
|
|
#include <net/udp.h>
|
|
|
|
#include <asm/unaligned.h>
|
|
|
|
|
|
|
|
/*
|
|
|
|
* We maintain a small pool of fully-sized skbs, to make sure the
|
|
|
|
* message gets out even in extreme OOM situations.
|
|
|
|
*/
|
|
|
|
|
|
|
|
#define MAX_UDP_CHUNK 1460
|
|
|
|
#define MAX_SKBS 32
|
|
|
|
#define MAX_QUEUE_DEPTH (MAX_SKBS / 2)
|
2005-08-12 02:25:54 +00:00
|
|
|
#define MAX_RETRIES 20000
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
static DEFINE_SPINLOCK(skb_list_lock);
|
|
|
|
static int nr_skbs;
|
|
|
|
static struct sk_buff *skbs;
|
|
|
|
|
|
|
|
static DEFINE_SPINLOCK(queue_lock);
|
|
|
|
static int queue_depth;
|
|
|
|
static struct sk_buff *queue_head, *queue_tail;
|
|
|
|
|
|
|
|
static atomic_t trapped;
|
|
|
|
|
|
|
|
#define NETPOLL_RX_ENABLED 1
|
|
|
|
#define NETPOLL_RX_DROP 2
|
|
|
|
|
|
|
|
#define MAX_SKB_SIZE \
|
|
|
|
(MAX_UDP_CHUNK + sizeof(struct udphdr) + \
|
|
|
|
sizeof(struct iphdr) + sizeof(struct ethhdr))
|
|
|
|
|
|
|
|
static void zap_completion_queue(void);
|
2006-06-26 07:04:27 +00:00
|
|
|
static void arp_reply(struct sk_buff *skb);
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
static void queue_process(void *p)
|
|
|
|
{
|
|
|
|
unsigned long flags;
|
|
|
|
struct sk_buff *skb;
|
|
|
|
|
|
|
|
while (queue_head) {
|
|
|
|
spin_lock_irqsave(&queue_lock, flags);
|
|
|
|
|
|
|
|
skb = queue_head;
|
|
|
|
queue_head = skb->next;
|
|
|
|
if (skb == queue_tail)
|
|
|
|
queue_head = NULL;
|
|
|
|
|
|
|
|
queue_depth--;
|
|
|
|
|
|
|
|
spin_unlock_irqrestore(&queue_lock, flags);
|
|
|
|
|
|
|
|
dev_queue_xmit(skb);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static DECLARE_WORK(send_queue, queue_process, NULL);
|
|
|
|
|
|
|
|
void netpoll_queue(struct sk_buff *skb)
|
|
|
|
{
|
|
|
|
unsigned long flags;
|
|
|
|
|
|
|
|
if (queue_depth == MAX_QUEUE_DEPTH) {
|
|
|
|
__kfree_skb(skb);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
spin_lock_irqsave(&queue_lock, flags);
|
|
|
|
if (!queue_head)
|
|
|
|
queue_head = skb;
|
|
|
|
else
|
|
|
|
queue_tail->next = skb;
|
|
|
|
queue_tail = skb;
|
|
|
|
queue_depth++;
|
|
|
|
spin_unlock_irqrestore(&queue_lock, flags);
|
|
|
|
|
|
|
|
schedule_work(&send_queue);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int checksum_udp(struct sk_buff *skb, struct udphdr *uh,
|
|
|
|
unsigned short ulen, u32 saddr, u32 daddr)
|
|
|
|
{
|
2005-11-10 21:01:24 +00:00
|
|
|
unsigned int psum;
|
|
|
|
|
|
|
|
if (uh->check == 0 || skb->ip_summed == CHECKSUM_UNNECESSARY)
|
2005-04-16 22:20:36 +00:00
|
|
|
return 0;
|
|
|
|
|
2005-11-10 21:01:24 +00:00
|
|
|
psum = csum_tcpudp_nofold(saddr, daddr, ulen, IPPROTO_UDP, 0);
|
|
|
|
|
|
|
|
if (skb->ip_summed == CHECKSUM_HW &&
|
|
|
|
!(u16)csum_fold(csum_add(psum, skb->csum)))
|
|
|
|
return 0;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2005-11-10 21:01:24 +00:00
|
|
|
skb->csum = psum;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2005-11-10 21:01:24 +00:00
|
|
|
return __skb_checksum_complete(skb);
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Check whether delayed processing was scheduled for our NIC. If so,
|
|
|
|
* we attempt to grab the poll lock and use ->poll() to pump the card.
|
|
|
|
* If this fails, either we've recursed in ->poll() or it's already
|
|
|
|
* running on another CPU.
|
|
|
|
*
|
|
|
|
* Note: we don't mask interrupts with this lock because we're using
|
|
|
|
* trylock here and interrupts are already disabled in the softirq
|
|
|
|
* case. Further, we test the poll_owner to avoid recursion on UP
|
|
|
|
* systems where the lock doesn't exist.
|
|
|
|
*
|
|
|
|
* In cases where there is bi-directional communications, reading only
|
|
|
|
* one message at a time can lead to packets being dropped by the
|
|
|
|
* network adapter, forcing superfluous retries and possibly timeouts.
|
|
|
|
* Thus, we set our budget to greater than 1.
|
|
|
|
*/
|
|
|
|
static void poll_napi(struct netpoll *np)
|
|
|
|
{
|
2005-06-23 05:05:31 +00:00
|
|
|
struct netpoll_info *npinfo = np->dev->npinfo;
|
2005-04-16 22:20:36 +00:00
|
|
|
int budget = 16;
|
|
|
|
|
|
|
|
if (test_bit(__LINK_STATE_RX_SCHED, &np->dev->state) &&
|
2005-06-23 05:05:31 +00:00
|
|
|
npinfo->poll_owner != smp_processor_id() &&
|
|
|
|
spin_trylock(&npinfo->poll_lock)) {
|
|
|
|
npinfo->rx_flags |= NETPOLL_RX_DROP;
|
2005-04-16 22:20:36 +00:00
|
|
|
atomic_inc(&trapped);
|
|
|
|
|
|
|
|
np->dev->poll(np->dev, &budget);
|
|
|
|
|
|
|
|
atomic_dec(&trapped);
|
2005-06-23 05:05:31 +00:00
|
|
|
npinfo->rx_flags &= ~NETPOLL_RX_DROP;
|
|
|
|
spin_unlock(&npinfo->poll_lock);
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2006-06-26 07:04:27 +00:00
|
|
|
static void service_arp_queue(struct netpoll_info *npi)
|
|
|
|
{
|
|
|
|
struct sk_buff *skb;
|
|
|
|
|
|
|
|
if (unlikely(!npi))
|
|
|
|
return;
|
|
|
|
|
|
|
|
skb = skb_dequeue(&npi->arp_tx);
|
|
|
|
|
|
|
|
while (skb != NULL) {
|
|
|
|
arp_reply(skb);
|
|
|
|
skb = skb_dequeue(&npi->arp_tx);
|
|
|
|
}
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
void netpoll_poll(struct netpoll *np)
|
|
|
|
{
|
|
|
|
if(!np->dev || !netif_running(np->dev) || !np->dev->poll_controller)
|
|
|
|
return;
|
|
|
|
|
|
|
|
/* Process pending work on NIC */
|
|
|
|
np->dev->poll_controller(np->dev);
|
|
|
|
if (np->dev->poll)
|
|
|
|
poll_napi(np);
|
|
|
|
|
2006-06-26 07:04:27 +00:00
|
|
|
service_arp_queue(np->dev->npinfo);
|
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
zap_completion_queue();
|
|
|
|
}
|
|
|
|
|
|
|
|
static void refill_skbs(void)
|
|
|
|
{
|
|
|
|
struct sk_buff *skb;
|
|
|
|
unsigned long flags;
|
|
|
|
|
|
|
|
spin_lock_irqsave(&skb_list_lock, flags);
|
|
|
|
while (nr_skbs < MAX_SKBS) {
|
|
|
|
skb = alloc_skb(MAX_SKB_SIZE, GFP_ATOMIC);
|
|
|
|
if (!skb)
|
|
|
|
break;
|
|
|
|
|
|
|
|
skb->next = skbs;
|
|
|
|
skbs = skb;
|
|
|
|
nr_skbs++;
|
|
|
|
}
|
|
|
|
spin_unlock_irqrestore(&skb_list_lock, flags);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void zap_completion_queue(void)
|
|
|
|
{
|
|
|
|
unsigned long flags;
|
|
|
|
struct softnet_data *sd = &get_cpu_var(softnet_data);
|
|
|
|
|
|
|
|
if (sd->completion_queue) {
|
|
|
|
struct sk_buff *clist;
|
|
|
|
|
|
|
|
local_irq_save(flags);
|
|
|
|
clist = sd->completion_queue;
|
|
|
|
sd->completion_queue = NULL;
|
|
|
|
local_irq_restore(flags);
|
|
|
|
|
|
|
|
while (clist != NULL) {
|
|
|
|
struct sk_buff *skb = clist;
|
|
|
|
clist = clist->next;
|
|
|
|
if(skb->destructor)
|
|
|
|
dev_kfree_skb_any(skb); /* put this one back */
|
|
|
|
else
|
|
|
|
__kfree_skb(skb);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
put_cpu_var(softnet_data);
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct sk_buff * find_skb(struct netpoll *np, int len, int reserve)
|
|
|
|
{
|
|
|
|
int once = 1, count = 0;
|
|
|
|
unsigned long flags;
|
|
|
|
struct sk_buff *skb = NULL;
|
|
|
|
|
|
|
|
zap_completion_queue();
|
|
|
|
repeat:
|
|
|
|
if (nr_skbs < MAX_SKBS)
|
|
|
|
refill_skbs();
|
|
|
|
|
|
|
|
skb = alloc_skb(len, GFP_ATOMIC);
|
|
|
|
|
|
|
|
if (!skb) {
|
|
|
|
spin_lock_irqsave(&skb_list_lock, flags);
|
|
|
|
skb = skbs;
|
|
|
|
if (skb) {
|
|
|
|
skbs = skb->next;
|
|
|
|
skb->next = NULL;
|
|
|
|
nr_skbs--;
|
|
|
|
}
|
|
|
|
spin_unlock_irqrestore(&skb_list_lock, flags);
|
|
|
|
}
|
|
|
|
|
|
|
|
if(!skb) {
|
|
|
|
count++;
|
|
|
|
if (once && (count == 1000000)) {
|
|
|
|
printk("out of netpoll skbs!\n");
|
|
|
|
once = 0;
|
|
|
|
}
|
|
|
|
netpoll_poll(np);
|
|
|
|
goto repeat;
|
|
|
|
}
|
|
|
|
|
|
|
|
atomic_set(&skb->users, 1);
|
|
|
|
skb_reserve(skb, reserve);
|
|
|
|
return skb;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void netpoll_send_skb(struct netpoll *np, struct sk_buff *skb)
|
|
|
|
{
|
|
|
|
int status;
|
2005-06-23 05:05:31 +00:00
|
|
|
struct netpoll_info *npinfo;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2005-08-12 02:25:11 +00:00
|
|
|
if (!np || !np->dev || !netif_running(np->dev)) {
|
2005-04-16 22:20:36 +00:00
|
|
|
__kfree_skb(skb);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
2005-06-23 05:05:31 +00:00
|
|
|
npinfo = np->dev->npinfo;
|
2005-08-12 02:25:11 +00:00
|
|
|
|
|
|
|
/* avoid recursion */
|
2005-06-23 05:05:31 +00:00
|
|
|
if (npinfo->poll_owner == smp_processor_id() ||
|
|
|
|
np->dev->xmit_lock_owner == smp_processor_id()) {
|
2005-04-16 22:20:36 +00:00
|
|
|
if (np->drop)
|
|
|
|
np->drop(skb);
|
|
|
|
else
|
|
|
|
__kfree_skb(skb);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
2005-08-12 02:25:54 +00:00
|
|
|
do {
|
|
|
|
npinfo->tries--;
|
2006-06-09 19:20:56 +00:00
|
|
|
netif_tx_lock(np->dev);
|
2005-08-12 02:25:11 +00:00
|
|
|
|
|
|
|
/*
|
|
|
|
* network drivers do not expect to be called if the queue is
|
|
|
|
* stopped.
|
|
|
|
*/
|
2006-06-26 07:03:40 +00:00
|
|
|
status = NETDEV_TX_BUSY;
|
|
|
|
if (!netif_queue_stopped(np->dev))
|
|
|
|
status = np->dev->hard_start_xmit(skb, np->dev);
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2006-06-09 19:20:56 +00:00
|
|
|
netif_tx_unlock(np->dev);
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2005-08-12 02:25:11 +00:00
|
|
|
/* success */
|
2005-08-12 02:25:54 +00:00
|
|
|
if(!status) {
|
|
|
|
npinfo->tries = MAX_RETRIES; /* reset */
|
2005-08-12 02:25:11 +00:00
|
|
|
return;
|
2005-08-12 02:25:54 +00:00
|
|
|
}
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2005-08-12 02:25:11 +00:00
|
|
|
/* transmit busy */
|
2005-04-16 22:20:36 +00:00
|
|
|
netpoll_poll(np);
|
2005-08-12 02:25:54 +00:00
|
|
|
udelay(50);
|
|
|
|
} while (npinfo->tries > 0);
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
void netpoll_send_udp(struct netpoll *np, const char *msg, int len)
|
|
|
|
{
|
|
|
|
int total_len, eth_len, ip_len, udp_len;
|
|
|
|
struct sk_buff *skb;
|
|
|
|
struct udphdr *udph;
|
|
|
|
struct iphdr *iph;
|
|
|
|
struct ethhdr *eth;
|
|
|
|
|
|
|
|
udp_len = len + sizeof(*udph);
|
|
|
|
ip_len = eth_len = udp_len + sizeof(*iph);
|
|
|
|
total_len = eth_len + ETH_HLEN + NET_IP_ALIGN;
|
|
|
|
|
|
|
|
skb = find_skb(np, total_len, total_len - len);
|
|
|
|
if (!skb)
|
|
|
|
return;
|
|
|
|
|
|
|
|
memcpy(skb->data, msg, len);
|
|
|
|
skb->len += len;
|
|
|
|
|
|
|
|
udph = (struct udphdr *) skb_push(skb, sizeof(*udph));
|
|
|
|
udph->source = htons(np->local_port);
|
|
|
|
udph->dest = htons(np->remote_port);
|
|
|
|
udph->len = htons(udp_len);
|
|
|
|
udph->check = 0;
|
|
|
|
|
|
|
|
iph = (struct iphdr *)skb_push(skb, sizeof(*iph));
|
|
|
|
|
|
|
|
/* iph->version = 4; iph->ihl = 5; */
|
|
|
|
put_unaligned(0x45, (unsigned char *)iph);
|
|
|
|
iph->tos = 0;
|
|
|
|
put_unaligned(htons(ip_len), &(iph->tot_len));
|
|
|
|
iph->id = 0;
|
|
|
|
iph->frag_off = 0;
|
|
|
|
iph->ttl = 64;
|
|
|
|
iph->protocol = IPPROTO_UDP;
|
|
|
|
iph->check = 0;
|
|
|
|
put_unaligned(htonl(np->local_ip), &(iph->saddr));
|
|
|
|
put_unaligned(htonl(np->remote_ip), &(iph->daddr));
|
|
|
|
iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);
|
|
|
|
|
|
|
|
eth = (struct ethhdr *) skb_push(skb, ETH_HLEN);
|
|
|
|
|
|
|
|
eth->h_proto = htons(ETH_P_IP);
|
|
|
|
memcpy(eth->h_source, np->local_mac, 6);
|
|
|
|
memcpy(eth->h_dest, np->remote_mac, 6);
|
|
|
|
|
|
|
|
skb->dev = np->dev;
|
|
|
|
|
|
|
|
netpoll_send_skb(np, skb);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void arp_reply(struct sk_buff *skb)
|
|
|
|
{
|
2005-06-23 05:05:31 +00:00
|
|
|
struct netpoll_info *npinfo = skb->dev->npinfo;
|
2005-04-16 22:20:36 +00:00
|
|
|
struct arphdr *arp;
|
|
|
|
unsigned char *arp_ptr;
|
|
|
|
int size, type = ARPOP_REPLY, ptype = ETH_P_ARP;
|
|
|
|
u32 sip, tip;
|
|
|
|
struct sk_buff *send_skb;
|
2005-06-23 05:05:31 +00:00
|
|
|
struct netpoll *np = NULL;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2005-06-23 05:05:59 +00:00
|
|
|
if (npinfo->rx_np && npinfo->rx_np->dev == skb->dev)
|
|
|
|
np = npinfo->rx_np;
|
2005-06-23 05:05:31 +00:00
|
|
|
if (!np)
|
|
|
|
return;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
/* No arp on this interface */
|
|
|
|
if (skb->dev->flags & IFF_NOARP)
|
|
|
|
return;
|
|
|
|
|
|
|
|
if (!pskb_may_pull(skb, (sizeof(struct arphdr) +
|
|
|
|
(2 * skb->dev->addr_len) +
|
|
|
|
(2 * sizeof(u32)))))
|
|
|
|
return;
|
|
|
|
|
|
|
|
skb->h.raw = skb->nh.raw = skb->data;
|
|
|
|
arp = skb->nh.arph;
|
|
|
|
|
|
|
|
if ((arp->ar_hrd != htons(ARPHRD_ETHER) &&
|
|
|
|
arp->ar_hrd != htons(ARPHRD_IEEE802)) ||
|
|
|
|
arp->ar_pro != htons(ETH_P_IP) ||
|
|
|
|
arp->ar_op != htons(ARPOP_REQUEST))
|
|
|
|
return;
|
|
|
|
|
|
|
|
arp_ptr = (unsigned char *)(arp+1) + skb->dev->addr_len;
|
|
|
|
memcpy(&sip, arp_ptr, 4);
|
|
|
|
arp_ptr += 4 + skb->dev->addr_len;
|
|
|
|
memcpy(&tip, arp_ptr, 4);
|
|
|
|
|
|
|
|
/* Should we ignore arp? */
|
|
|
|
if (tip != htonl(np->local_ip) || LOOPBACK(tip) || MULTICAST(tip))
|
|
|
|
return;
|
|
|
|
|
|
|
|
size = sizeof(struct arphdr) + 2 * (skb->dev->addr_len + 4);
|
|
|
|
send_skb = find_skb(np, size + LL_RESERVED_SPACE(np->dev),
|
|
|
|
LL_RESERVED_SPACE(np->dev));
|
|
|
|
|
|
|
|
if (!send_skb)
|
|
|
|
return;
|
|
|
|
|
|
|
|
send_skb->nh.raw = send_skb->data;
|
|
|
|
arp = (struct arphdr *) skb_put(send_skb, size);
|
|
|
|
send_skb->dev = skb->dev;
|
|
|
|
send_skb->protocol = htons(ETH_P_ARP);
|
|
|
|
|
|
|
|
/* Fill the device header for the ARP frame */
|
|
|
|
|
|
|
|
if (np->dev->hard_header &&
|
|
|
|
np->dev->hard_header(send_skb, skb->dev, ptype,
|
|
|
|
np->remote_mac, np->local_mac,
|
|
|
|
send_skb->len) < 0) {
|
|
|
|
kfree_skb(send_skb);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Fill out the arp protocol part.
|
|
|
|
*
|
|
|
|
* we only support ethernet device type,
|
|
|
|
* which (according to RFC 1390) should always equal 1 (Ethernet).
|
|
|
|
*/
|
|
|
|
|
|
|
|
arp->ar_hrd = htons(np->dev->type);
|
|
|
|
arp->ar_pro = htons(ETH_P_IP);
|
|
|
|
arp->ar_hln = np->dev->addr_len;
|
|
|
|
arp->ar_pln = 4;
|
|
|
|
arp->ar_op = htons(type);
|
|
|
|
|
|
|
|
arp_ptr=(unsigned char *)(arp + 1);
|
|
|
|
memcpy(arp_ptr, np->dev->dev_addr, np->dev->addr_len);
|
|
|
|
arp_ptr += np->dev->addr_len;
|
|
|
|
memcpy(arp_ptr, &tip, 4);
|
|
|
|
arp_ptr += 4;
|
|
|
|
memcpy(arp_ptr, np->remote_mac, np->dev->addr_len);
|
|
|
|
arp_ptr += np->dev->addr_len;
|
|
|
|
memcpy(arp_ptr, &sip, 4);
|
|
|
|
|
|
|
|
netpoll_send_skb(np, send_skb);
|
|
|
|
}
|
|
|
|
|
|
|
|
int __netpoll_rx(struct sk_buff *skb)
|
|
|
|
{
|
|
|
|
int proto, len, ulen;
|
|
|
|
struct iphdr *iph;
|
|
|
|
struct udphdr *uh;
|
2006-06-26 07:04:27 +00:00
|
|
|
struct netpoll_info *npi = skb->dev->npinfo;
|
|
|
|
struct netpoll *np = npi->rx_np;
|
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2005-06-23 05:05:59 +00:00
|
|
|
if (!np)
|
2005-04-16 22:20:36 +00:00
|
|
|
goto out;
|
|
|
|
if (skb->dev->type != ARPHRD_ETHER)
|
|
|
|
goto out;
|
|
|
|
|
|
|
|
/* check if netpoll clients need ARP */
|
|
|
|
if (skb->protocol == __constant_htons(ETH_P_ARP) &&
|
|
|
|
atomic_read(&trapped)) {
|
2006-06-26 07:04:27 +00:00
|
|
|
skb_queue_tail(&npi->arp_tx, skb);
|
2005-04-16 22:20:36 +00:00
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
proto = ntohs(eth_hdr(skb)->h_proto);
|
|
|
|
if (proto != ETH_P_IP)
|
|
|
|
goto out;
|
|
|
|
if (skb->pkt_type == PACKET_OTHERHOST)
|
|
|
|
goto out;
|
|
|
|
if (skb_shared(skb))
|
|
|
|
goto out;
|
|
|
|
|
|
|
|
iph = (struct iphdr *)skb->data;
|
|
|
|
if (!pskb_may_pull(skb, sizeof(struct iphdr)))
|
|
|
|
goto out;
|
|
|
|
if (iph->ihl < 5 || iph->version != 4)
|
|
|
|
goto out;
|
|
|
|
if (!pskb_may_pull(skb, iph->ihl*4))
|
|
|
|
goto out;
|
|
|
|
if (ip_fast_csum((u8 *)iph, iph->ihl) != 0)
|
|
|
|
goto out;
|
|
|
|
|
|
|
|
len = ntohs(iph->tot_len);
|
|
|
|
if (skb->len < len || len < iph->ihl*4)
|
|
|
|
goto out;
|
|
|
|
|
|
|
|
if (iph->protocol != IPPROTO_UDP)
|
|
|
|
goto out;
|
|
|
|
|
|
|
|
len -= iph->ihl*4;
|
|
|
|
uh = (struct udphdr *)(((char *)iph) + iph->ihl*4);
|
|
|
|
ulen = ntohs(uh->len);
|
|
|
|
|
|
|
|
if (ulen != len)
|
|
|
|
goto out;
|
2005-11-10 21:01:24 +00:00
|
|
|
if (checksum_udp(skb, uh, ulen, iph->saddr, iph->daddr))
|
2005-04-16 22:20:36 +00:00
|
|
|
goto out;
|
|
|
|
if (np->local_ip && np->local_ip != ntohl(iph->daddr))
|
|
|
|
goto out;
|
|
|
|
if (np->remote_ip && np->remote_ip != ntohl(iph->saddr))
|
|
|
|
goto out;
|
|
|
|
if (np->local_port && np->local_port != ntohs(uh->dest))
|
|
|
|
goto out;
|
|
|
|
|
|
|
|
np->rx_hook(np, ntohs(uh->source),
|
|
|
|
(char *)(uh+1),
|
|
|
|
ulen - sizeof(struct udphdr));
|
|
|
|
|
|
|
|
kfree_skb(skb);
|
|
|
|
return 1;
|
|
|
|
|
|
|
|
out:
|
|
|
|
if (atomic_read(&trapped)) {
|
|
|
|
kfree_skb(skb);
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
int netpoll_parse_options(struct netpoll *np, char *opt)
|
|
|
|
{
|
|
|
|
char *cur=opt, *delim;
|
|
|
|
|
|
|
|
if(*cur != '@') {
|
|
|
|
if ((delim = strchr(cur, '@')) == NULL)
|
|
|
|
goto parse_failed;
|
|
|
|
*delim=0;
|
|
|
|
np->local_port=simple_strtol(cur, NULL, 10);
|
|
|
|
cur=delim;
|
|
|
|
}
|
|
|
|
cur++;
|
|
|
|
printk(KERN_INFO "%s: local port %d\n", np->name, np->local_port);
|
|
|
|
|
|
|
|
if(*cur != '/') {
|
|
|
|
if ((delim = strchr(cur, '/')) == NULL)
|
|
|
|
goto parse_failed;
|
|
|
|
*delim=0;
|
|
|
|
np->local_ip=ntohl(in_aton(cur));
|
|
|
|
cur=delim;
|
|
|
|
|
|
|
|
printk(KERN_INFO "%s: local IP %d.%d.%d.%d\n",
|
|
|
|
np->name, HIPQUAD(np->local_ip));
|
|
|
|
}
|
|
|
|
cur++;
|
|
|
|
|
|
|
|
if ( *cur != ',') {
|
|
|
|
/* parse out dev name */
|
|
|
|
if ((delim = strchr(cur, ',')) == NULL)
|
|
|
|
goto parse_failed;
|
|
|
|
*delim=0;
|
|
|
|
strlcpy(np->dev_name, cur, sizeof(np->dev_name));
|
|
|
|
cur=delim;
|
|
|
|
}
|
|
|
|
cur++;
|
|
|
|
|
|
|
|
printk(KERN_INFO "%s: interface %s\n", np->name, np->dev_name);
|
|
|
|
|
|
|
|
if ( *cur != '@' ) {
|
|
|
|
/* dst port */
|
|
|
|
if ((delim = strchr(cur, '@')) == NULL)
|
|
|
|
goto parse_failed;
|
|
|
|
*delim=0;
|
|
|
|
np->remote_port=simple_strtol(cur, NULL, 10);
|
|
|
|
cur=delim;
|
|
|
|
}
|
|
|
|
cur++;
|
|
|
|
printk(KERN_INFO "%s: remote port %d\n", np->name, np->remote_port);
|
|
|
|
|
|
|
|
/* dst ip */
|
|
|
|
if ((delim = strchr(cur, '/')) == NULL)
|
|
|
|
goto parse_failed;
|
|
|
|
*delim=0;
|
|
|
|
np->remote_ip=ntohl(in_aton(cur));
|
|
|
|
cur=delim+1;
|
|
|
|
|
|
|
|
printk(KERN_INFO "%s: remote IP %d.%d.%d.%d\n",
|
|
|
|
np->name, HIPQUAD(np->remote_ip));
|
|
|
|
|
|
|
|
if( *cur != 0 )
|
|
|
|
{
|
|
|
|
/* MAC address */
|
|
|
|
if ((delim = strchr(cur, ':')) == NULL)
|
|
|
|
goto parse_failed;
|
|
|
|
*delim=0;
|
|
|
|
np->remote_mac[0]=simple_strtol(cur, NULL, 16);
|
|
|
|
cur=delim+1;
|
|
|
|
if ((delim = strchr(cur, ':')) == NULL)
|
|
|
|
goto parse_failed;
|
|
|
|
*delim=0;
|
|
|
|
np->remote_mac[1]=simple_strtol(cur, NULL, 16);
|
|
|
|
cur=delim+1;
|
|
|
|
if ((delim = strchr(cur, ':')) == NULL)
|
|
|
|
goto parse_failed;
|
|
|
|
*delim=0;
|
|
|
|
np->remote_mac[2]=simple_strtol(cur, NULL, 16);
|
|
|
|
cur=delim+1;
|
|
|
|
if ((delim = strchr(cur, ':')) == NULL)
|
|
|
|
goto parse_failed;
|
|
|
|
*delim=0;
|
|
|
|
np->remote_mac[3]=simple_strtol(cur, NULL, 16);
|
|
|
|
cur=delim+1;
|
|
|
|
if ((delim = strchr(cur, ':')) == NULL)
|
|
|
|
goto parse_failed;
|
|
|
|
*delim=0;
|
|
|
|
np->remote_mac[4]=simple_strtol(cur, NULL, 16);
|
|
|
|
cur=delim+1;
|
|
|
|
np->remote_mac[5]=simple_strtol(cur, NULL, 16);
|
|
|
|
}
|
|
|
|
|
|
|
|
printk(KERN_INFO "%s: remote ethernet address "
|
|
|
|
"%02x:%02x:%02x:%02x:%02x:%02x\n",
|
|
|
|
np->name,
|
|
|
|
np->remote_mac[0],
|
|
|
|
np->remote_mac[1],
|
|
|
|
np->remote_mac[2],
|
|
|
|
np->remote_mac[3],
|
|
|
|
np->remote_mac[4],
|
|
|
|
np->remote_mac[5]);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
parse_failed:
|
|
|
|
printk(KERN_INFO "%s: couldn't parse config at %s!\n",
|
|
|
|
np->name, cur);
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
|
|
|
int netpoll_setup(struct netpoll *np)
|
|
|
|
{
|
|
|
|
struct net_device *ndev = NULL;
|
|
|
|
struct in_device *in_dev;
|
2005-06-23 05:05:31 +00:00
|
|
|
struct netpoll_info *npinfo;
|
2005-06-23 05:05:59 +00:00
|
|
|
unsigned long flags;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
if (np->dev_name)
|
|
|
|
ndev = dev_get_by_name(np->dev_name);
|
|
|
|
if (!ndev) {
|
|
|
|
printk(KERN_ERR "%s: %s doesn't exist, aborting.\n",
|
|
|
|
np->name, np->dev_name);
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
|
|
|
np->dev = ndev;
|
2005-06-23 05:05:31 +00:00
|
|
|
if (!ndev->npinfo) {
|
|
|
|
npinfo = kmalloc(sizeof(*npinfo), GFP_KERNEL);
|
|
|
|
if (!npinfo)
|
|
|
|
goto release;
|
|
|
|
|
2005-08-12 02:23:04 +00:00
|
|
|
npinfo->rx_flags = 0;
|
2005-06-23 05:05:59 +00:00
|
|
|
npinfo->rx_np = NULL;
|
2005-09-09 20:10:41 +00:00
|
|
|
spin_lock_init(&npinfo->poll_lock);
|
2005-06-23 05:05:31 +00:00
|
|
|
npinfo->poll_owner = -1;
|
2005-08-12 02:25:54 +00:00
|
|
|
npinfo->tries = MAX_RETRIES;
|
2005-09-09 20:10:41 +00:00
|
|
|
spin_lock_init(&npinfo->rx_lock);
|
2006-06-26 07:04:27 +00:00
|
|
|
skb_queue_head_init(&npinfo->arp_tx);
|
2005-06-23 05:05:31 +00:00
|
|
|
} else
|
|
|
|
npinfo = ndev->npinfo;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
if (!ndev->poll_controller) {
|
|
|
|
printk(KERN_ERR "%s: %s doesn't support polling, aborting.\n",
|
|
|
|
np->name, np->dev_name);
|
|
|
|
goto release;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (!netif_running(ndev)) {
|
|
|
|
unsigned long atmost, atleast;
|
|
|
|
|
|
|
|
printk(KERN_INFO "%s: device %s not up yet, forcing it\n",
|
|
|
|
np->name, np->dev_name);
|
|
|
|
|
2006-03-21 06:23:58 +00:00
|
|
|
rtnl_lock();
|
2005-04-16 22:20:36 +00:00
|
|
|
if (dev_change_flags(ndev, ndev->flags | IFF_UP) < 0) {
|
|
|
|
printk(KERN_ERR "%s: failed to open %s\n",
|
|
|
|
np->name, np->dev_name);
|
2006-03-21 06:23:58 +00:00
|
|
|
rtnl_unlock();
|
2005-04-16 22:20:36 +00:00
|
|
|
goto release;
|
|
|
|
}
|
2006-03-21 06:23:58 +00:00
|
|
|
rtnl_unlock();
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
atleast = jiffies + HZ/10;
|
|
|
|
atmost = jiffies + 4*HZ;
|
|
|
|
while (!netif_carrier_ok(ndev)) {
|
|
|
|
if (time_after(jiffies, atmost)) {
|
|
|
|
printk(KERN_NOTICE
|
|
|
|
"%s: timeout waiting for carrier\n",
|
|
|
|
np->name);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
cond_resched();
|
|
|
|
}
|
|
|
|
|
|
|
|
/* If carrier appears to come up instantly, we don't
|
|
|
|
* trust it and pause so that we don't pump all our
|
|
|
|
* queued console messages into the bitbucket.
|
|
|
|
*/
|
|
|
|
|
|
|
|
if (time_before(jiffies, atleast)) {
|
|
|
|
printk(KERN_NOTICE "%s: carrier detect appears"
|
|
|
|
" untrustworthy, waiting 4 seconds\n",
|
|
|
|
np->name);
|
|
|
|
msleep(4000);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2006-01-17 23:15:38 +00:00
|
|
|
if (is_zero_ether_addr(np->local_mac) && ndev->dev_addr)
|
2005-04-16 22:20:36 +00:00
|
|
|
memcpy(np->local_mac, ndev->dev_addr, 6);
|
|
|
|
|
|
|
|
if (!np->local_ip) {
|
|
|
|
rcu_read_lock();
|
2005-10-03 21:35:55 +00:00
|
|
|
in_dev = __in_dev_get_rcu(ndev);
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
if (!in_dev || !in_dev->ifa_list) {
|
|
|
|
rcu_read_unlock();
|
|
|
|
printk(KERN_ERR "%s: no IP address for %s, aborting\n",
|
|
|
|
np->name, np->dev_name);
|
|
|
|
goto release;
|
|
|
|
}
|
|
|
|
|
|
|
|
np->local_ip = ntohl(in_dev->ifa_list->ifa_local);
|
|
|
|
rcu_read_unlock();
|
|
|
|
printk(KERN_INFO "%s: local IP %d.%d.%d.%d\n",
|
|
|
|
np->name, HIPQUAD(np->local_ip));
|
|
|
|
}
|
|
|
|
|
2005-06-23 05:05:59 +00:00
|
|
|
if (np->rx_hook) {
|
|
|
|
spin_lock_irqsave(&npinfo->rx_lock, flags);
|
|
|
|
npinfo->rx_flags |= NETPOLL_RX_ENABLED;
|
|
|
|
npinfo->rx_np = np;
|
|
|
|
spin_unlock_irqrestore(&npinfo->rx_lock, flags);
|
|
|
|
}
|
2005-08-12 02:26:42 +00:00
|
|
|
|
|
|
|
/* fill up the skb queue */
|
|
|
|
refill_skbs();
|
|
|
|
|
2005-06-23 05:05:59 +00:00
|
|
|
/* last thing to do is link it to the net device structure */
|
2005-06-23 05:05:31 +00:00
|
|
|
ndev->npinfo = npinfo;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2005-08-12 02:27:43 +00:00
|
|
|
/* avoid racing with NAPI reading npinfo */
|
|
|
|
synchronize_rcu();
|
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
return 0;
|
|
|
|
|
|
|
|
release:
|
2005-06-23 05:05:31 +00:00
|
|
|
if (!ndev->npinfo)
|
|
|
|
kfree(npinfo);
|
2005-04-16 22:20:36 +00:00
|
|
|
np->dev = NULL;
|
|
|
|
dev_put(ndev);
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
|
|
|
void netpoll_cleanup(struct netpoll *np)
|
|
|
|
{
|
2005-06-23 05:05:59 +00:00
|
|
|
struct netpoll_info *npinfo;
|
|
|
|
unsigned long flags;
|
|
|
|
|
2005-06-23 05:05:31 +00:00
|
|
|
if (np->dev) {
|
2005-06-23 05:05:59 +00:00
|
|
|
npinfo = np->dev->npinfo;
|
|
|
|
if (npinfo && npinfo->rx_np == np) {
|
|
|
|
spin_lock_irqsave(&npinfo->rx_lock, flags);
|
|
|
|
npinfo->rx_np = NULL;
|
|
|
|
npinfo->rx_flags &= ~NETPOLL_RX_ENABLED;
|
|
|
|
spin_unlock_irqrestore(&npinfo->rx_lock, flags);
|
|
|
|
}
|
2005-06-23 05:05:31 +00:00
|
|
|
dev_put(np->dev);
|
|
|
|
}
|
2005-06-23 05:05:59 +00:00
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
np->dev = NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
int netpoll_trap(void)
|
|
|
|
{
|
|
|
|
return atomic_read(&trapped);
|
|
|
|
}
|
|
|
|
|
|
|
|
void netpoll_set_trap(int trap)
|
|
|
|
{
|
|
|
|
if (trap)
|
|
|
|
atomic_inc(&trapped);
|
|
|
|
else
|
|
|
|
atomic_dec(&trapped);
|
|
|
|
}
|
|
|
|
|
|
|
|
EXPORT_SYMBOL(netpoll_set_trap);
|
|
|
|
EXPORT_SYMBOL(netpoll_trap);
|
|
|
|
EXPORT_SYMBOL(netpoll_parse_options);
|
|
|
|
EXPORT_SYMBOL(netpoll_setup);
|
|
|
|
EXPORT_SYMBOL(netpoll_cleanup);
|
|
|
|
EXPORT_SYMBOL(netpoll_send_udp);
|
|
|
|
EXPORT_SYMBOL(netpoll_poll);
|
|
|
|
EXPORT_SYMBOL(netpoll_queue);
|