skb = vlan_insert_tag(skb,queue->tx.opts.tci);if(unlikely(!skb))gotoskip_send; }#elseif(queue->tx.opts.tci) { skb = vlan_insert_tag(skb, htons(ETH_P_8021Q),queue->tx.opts.tci);if(unlikely(!skb))gotoskip_send; }if(queue->tx.opts.outer_tci) { skb = vlan_insert_tag(skb...
err = skb_copy_datagram_iovec(skb,0, msg->msg_iov, copied);if(err)gotoout_free_skb; sock_recv_timestamp(msg, sk, skb); serr =SKB_EXT_ERR(skb);sin= (struct sockaddr_in6 *)msg->msg_name;if(sin) {constunsignedchar*nh = skb_network_header(skb);sin->sin6_family = AF_INET6;...
在Linux内核中，skb (Sk_buff) 是网络传输的核心数据结构，承载着数据从应用层到硬件的旅程。它在内核数据路径的TX (发送) 和RX (接收) 环境中起着关键作用。让我们深入剖析这个数据结构的内部构造，以及它在TCP/IP Stack和设备驱动中的实际操作。首先，skb由几个关键部分构成：Head/End、Data/Tail...
So far the creation of the TX echo skb was optional and can be controlled by the local sender of a CAN frame. It turns out that the TX echo CAN skb can be piggybacked to carry information in the driver from the TX- to the TX-complete handler. Several drivers already use the return ...
if (icsk->icsk_ca_ops->flags & TCP_CONG_RTT_STAMP) __net_timestamp(skb); /*根据传递进来的clone_it参数来确定是否需要克隆待发送的报文。*/ if (likely(clone_it)) { /*如果skb已经被clone,则只能复制该skb的数据到新分配的skb中*/
if(icsk->icsk_ca_ops->flags&TCP_CONG_RTT_STAMP) __net_timestamp(skb); /*根据传递进来的clone_it参数来确定是否需要克隆待发送的报文。*/ if(likely(clone_it)) { /*如果skb已经被clone,则只能复制该skb的数据到新分配的skb中*/ if(unlikely(skb_cloned(skb))) ...
> a very long time -- each scan attempt is making a single transition > out-and-back to IPS mode, which meant it may be leaking any > outstanding TX DMA. And testing confirms this: if I just bring up the > interface, run a scan, then bring it down, I see many fewer unmaps ...
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> > a very long time -- each scan attempt is making a single transition > > out-and-back to IPS mode, which meant it may be leaking any > > outstanding TX DMA. And testing confirms this: if I just bring up the > > interface, run a scan, then bring it down, I see many fewe...
I feel like since this issue has possibly cropped up again it makes sense to build in some protection in this path (even on the latest kernel versions) since the code in question just blindly assumes there's a valid skb without testing if it's NULL b/f it looks at the timestamp. Giv...