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本帖最后由 tc1989tc 于 2013-07-09 19:52 编辑
int netif_receive_skb(struct sk_buff *skb)
{
struct packet_type *ptype, *pt_prev;
struct net_device *orig_dev;
struct net_device *null_or_orig;
int ret = NET_RX_DROP;
__be16 type;
if (skb->vlan_tci && vlan_hwaccel_do_receive(skb))
return NET_RX_SUCCESS;
/* if we've gotten here through NAPI, check netpoll */
if (netpoll_receive_skb(skb))
return NET_RX_DROP;
if (!skb->tstamp.tv64)
net_timestamp(skb);
if (!skb->iif)
skb->iif = skb->dev->ifindex;
null_or_orig = NULL;
orig_dev = skb->dev;
if (orig_dev->master) {
if (skb_bond_should_drop(skb))
null_or_orig = orig_dev; /* deliver only exact match */
else
skb->dev = orig_dev->master;
}
__get_cpu_var(netdev_rx_stat).total++;
skb_reset_network_header(skb);
skb_reset_transport_header(skb);
skb->mac_len = skb->network_header - skb->mac_header;
pt_prev = NULL;
rcu_read_lock();
/* Don't receive packets in an exiting network namespace */
if (!net_alive(dev_net(skb->dev)))
goto out;
#ifdef CONFIG_NET_CLS_ACT
if (skb->tc_verd & TC_NCLS) {
skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
goto ncls;
}
#endif
list_for_each_entry_rcu(ptype, &ptype_all, list) {
if (ptype->dev == null_or_orig || ptype->dev == skb->dev ||
ptype->dev == orig_dev) {
if (pt_prev)
ret = deliver_skb(skb, pt_prev, orig_dev);
pt_prev = ptype;
}
}
#ifdef CONFIG_NET_CLS_ACT
skb = handle_ing(skb, &pt_prev, &ret, orig_dev);
if (!skb)
goto out;
ncls:
#endif
skb = handle_bridge(skb, &pt_prev, &ret, orig_dev);
if (!skb)
goto out;
skb = handle_macvlan(skb, &pt_prev, &ret, orig_dev);
if (!skb)
goto out;
type = skb->protocol;
list_for_each_entry_rcu(ptype,
&ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
if (ptype->type == type &&
(ptype->dev == null_or_orig || ptype->dev == skb->dev ||
ptype->dev == orig_dev)) {
if (pt_prev)
ret = deliver_skb(skb, pt_prev, orig_dev);
pt_prev = ptype;
}
}
if (pt_prev) {
ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
} else {
kfree_skb(skb);
/* Jamal, now you will not able to escape explaining
* me how you were going to use this.
*/
ret = NET_RX_DROP;
}
out:
rcu_read_unlock();
return ret;
}
该回调函数函数中ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev);是不是通过调用void dev_add_pack(struct packet_type *pt)函数注册的啊,,不同的ip_protocl注册一个回调函数,??望各位朋友指导哈 最近在学校网络协议栈 希望各位大牛给点意见 |
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