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netpoll: allow execution of multiple rx_hooks per interface 

Signed-off-by: Daniel Borkmann <danborkmann@googlemail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Daniel Borkmann 2010-01-12 14:27:30 +00:00 committed by David S. Miller
parent e1d5a01072
commit 508e14b4a4
2 changed files with 116 additions and 68 deletions
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11
include/linux/netpoll.h
View File

@ -21,15 +21,20 @@ struct netpoll {
__be32 local_ip, remote_ip;
u16 local_port, remote_port;
u8 remote_mac[ETH_ALEN];
struct list_head rx; /* rx_np list element */
};
struct netpoll_info {
atomic_t refcnt;
int rx_flags;
spinlock_t rx_lock;
struct netpoll *rx_np; /* netpoll that registered an rx_hook */
struct list_head rx_np; /* netpolls that registered an rx_hook */
struct sk_buff_head arp_tx; /* list of arp requests to reply to */
struct sk_buff_head txq;
struct delayed_work tx_work;
};
@ -51,7 +56,7 @@ static inline int netpoll_rx(struct sk_buff *skb)
unsigned long flags;
int ret = 0;
if (!npinfo || (!npinfo->rx_np && !npinfo->rx_flags))
if (!npinfo || (list_empty(&npinfo->rx_np) && !npinfo->rx_flags))
return 0;
spin_lock_irqsave(&npinfo->rx_lock, flags);
@ -67,7 +72,7 @@ static inline int netpoll_rx_on(struct sk_buff *skb)
{
struct netpoll_info *npinfo = skb->dev->npinfo;
return npinfo && (npinfo->rx_np || npinfo->rx_flags);
return npinfo && (!list_empty(&npinfo->rx_np) || npinfo->rx_flags);
}
static inline int netpoll_receive_skb(struct sk_buff *skb)

173
net/core/netpoll.c
View File

@ -407,11 +407,24 @@ static void arp_reply(struct sk_buff *skb)
__be32 sip, tip;
unsigned char *sha;
struct sk_buff *send_skb;
struct netpoll *np = NULL;
struct netpoll *np, *tmp;
unsigned long flags;
int hits = 0;
if (npinfo->rx_np && npinfo->rx_np->dev == skb->dev)
np = npinfo->rx_np;
if (!np)
if (list_empty(&npinfo->rx_np))
return;
/* Before checking the packet, we do some early
inspection whether this is interesting at all */
spin_lock_irqsave(&npinfo->rx_lock, flags);
list_for_each_entry_safe(np, tmp, &npinfo->rx_np, rx) {
if (np->dev == skb->dev)
hits++;
}
spin_unlock_irqrestore(&npinfo->rx_lock, flags);
/* No netpoll struct is using this dev */
if (!hits)
return;
/* No arp on this interface */
@ -437,77 +450,91 @@ static void arp_reply(struct sk_buff *skb)
arp_ptr += skb->dev->addr_len;
memcpy(&sip, arp_ptr, 4);
arp_ptr += 4;
/* if we actually cared about dst hw addr, it would get copied here */
/* If we actually cared about dst hw addr,
it would get copied here */
arp_ptr += skb->dev->addr_len;
memcpy(&tip, arp_ptr, 4);
/* Should we ignore arp? */
if (tip != np->local_ip ||
ipv4_is_loopback(tip) || ipv4_is_multicast(tip))
if (ipv4_is_loopback(tip) || ipv4_is_multicast(tip))
return;
size = arp_hdr_len(skb->dev);
send_skb = find_skb(np, size + LL_ALLOCATED_SPACE(np->dev),
LL_RESERVED_SPACE(np->dev));
if (!send_skb)
return;
spin_lock_irqsave(&npinfo->rx_lock, flags);
list_for_each_entry_safe(np, tmp, &npinfo->rx_np, rx) {
if (tip != np->local_ip)
continue;
skb_reset_network_header(send_skb);
arp = (struct arphdr *) skb_put(send_skb, size);
send_skb->dev = skb->dev;
send_skb->protocol = htons(ETH_P_ARP);
send_skb = find_skb(np, size + LL_ALLOCATED_SPACE(np->dev),
LL_RESERVED_SPACE(np->dev));
if (!send_skb)
continue;
/* Fill the device header for the ARP frame */
if (dev_hard_header(send_skb, skb->dev, ptype,
sha, np->dev->dev_addr,
send_skb->len) < 0) {
kfree_skb(send_skb);
return;
skb_reset_network_header(send_skb);
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 (dev_hard_header(send_skb, skb->dev, ptype,
sha, np->dev->dev_addr,
send_skb->len) < 0) {
kfree_skb(send_skb);
continue;
}
/*
* 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, sha, np->dev->addr_len);
arp_ptr += np->dev->addr_len;
memcpy(arp_ptr, &sip, 4);
netpoll_send_skb(np, send_skb);
/* If there are several rx_hooks for the same address,
we're fine by sending a single reply */
break;
}
/*
* 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, sha, np->dev->addr_len);
arp_ptr += np->dev->addr_len;
memcpy(arp_ptr, &sip, 4);
netpoll_send_skb(np, send_skb);
spin_unlock_irqrestore(&npinfo->rx_lock, flags);
}
int __netpoll_rx(struct sk_buff *skb)
{
int proto, len, ulen;
int hits = 0;
struct iphdr *iph;
struct udphdr *uh;
struct netpoll_info *npi = skb->dev->npinfo;
struct netpoll *np = npi->rx_np;
struct netpoll_info *npinfo = skb->dev->npinfo;
struct netpoll *np, *tmp;
if (!np)
if (list_empty(&npinfo->rx_np))
goto out;
if (skb->dev->type != ARPHRD_ETHER)
goto out;
/* check if netpoll clients need ARP */
if (skb->protocol == htons(ETH_P_ARP) &&
atomic_read(&trapped)) {
skb_queue_tail(&npi->arp_tx, skb);
skb_queue_tail(&npinfo->arp_tx, skb);
return 1;
}
@ -551,16 +578,23 @@ int __netpoll_rx(struct sk_buff *skb)
goto out;
if (checksum_udp(skb, uh, ulen, iph->saddr, iph->daddr))
goto out;
if (np->local_ip && np->local_ip != iph->daddr)
goto out;
if (np->remote_ip && np->remote_ip != 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));
list_for_each_entry_safe(np, tmp, &npinfo->rx_np, rx) {
if (np->local_ip && np->local_ip != iph->daddr)
continue;
if (np->remote_ip && np->remote_ip != iph->saddr)
continue;
if (np->local_port && np->local_port != ntohs(uh->dest))
continue;
np->rx_hook(np, ntohs(uh->source),
(char *)(uh+1),
ulen - sizeof(struct udphdr));
hits++;
}
if (!hits)
goto out;
kfree_skb(skb);
return 1;
@ -684,6 +718,7 @@ int netpoll_setup(struct netpoll *np)
struct net_device *ndev = NULL;
struct in_device *in_dev;
struct netpoll_info *npinfo;
struct netpoll *npe, *tmp;
unsigned long flags;
int err;
@ -704,7 +739,7 @@ int netpoll_setup(struct netpoll *np)
}
npinfo->rx_flags = 0;
npinfo->rx_np = NULL;
INIT_LIST_HEAD(&npinfo->rx_np);
spin_lock_init(&npinfo->rx_lock);
skb_queue_head_init(&npinfo->arp_tx);
@ -785,7 +820,7 @@ int netpoll_setup(struct netpoll *np)
if (np->rx_hook) {
spin_lock_irqsave(&npinfo->rx_lock, flags);
npinfo->rx_flags |= NETPOLL_RX_ENABLED;
npinfo->rx_np = np;
list_add_tail(&np->rx, &npinfo->rx_np);
spin_unlock_irqrestore(&npinfo->rx_lock, flags);
}
@ -801,9 +836,16 @@ int netpoll_setup(struct netpoll *np)
return 0;
release:
if (!ndev->npinfo)
if (!ndev->npinfo) {
spin_lock_irqsave(&npinfo->rx_lock, flags);
list_for_each_entry_safe(npe, tmp, &npinfo->rx_np, rx) {
npe->dev = NULL;
}
spin_unlock_irqrestore(&npinfo->rx_lock, flags);
kfree(npinfo);
np->dev = NULL;
}
dev_put(ndev);
return err;
}
@ -823,10 +865,11 @@ void netpoll_cleanup(struct netpoll *np)
if (np->dev) {
npinfo = np->dev->npinfo;
if (npinfo) {
if (npinfo->rx_np == np) {
if (!list_empty(&npinfo->rx_np)) {
spin_lock_irqsave(&npinfo->rx_lock, flags);
npinfo->rx_np = NULL;
npinfo->rx_flags &= ~NETPOLL_RX_ENABLED;
list_del(&np->rx);
if (list_empty(&npinfo->rx_np))
npinfo->rx_flags &= ~NETPOLL_RX_ENABLED;
spin_unlock_irqrestore(&npinfo->rx_lock, flags);
}