3.中间的一些分片等,可参阅相关文档。基本思想是,当报文的长度大于mtu,gso的长度不为0就会调用 ip_fragment 进行分片,否则就会调用ip_finish_output2把数据发送出去。ip_fragment 函数中,会检查 IP_DF 标志位,如果待分片IP数据包禁止分片,则调用 icmp_send()向发送方发送一个原因为需要分片而设置了不分片标志的...
An IP header contains a Don't Fragment (DF) field, indicating whether an IP datagram can be fragmented. If the DF field of an IP datagram is set to 1, a device does not fragment the datagram. If the length of an IP datagram is greater than the MTU of an interface due to protocol...
ip_queue_xmit()首先为输入包建立IP包头, 经过本地包过滤器后,再将IP包分片输出(ip_fragment)。 1int__ip_queue_xmit(structsock *sk,structsk_buff *skb,structflowi *fl,2__u8 tos)3{4structinet_sock *inet =inet_sk(sk);5structnet *net =sock_net(sk);6structip_options_rcu *inet_opt;7s...
Fragment first in first out (FIFO) Disabled Function of discarding fragments that match a specified ACL Disabled Forced fragmentation for IPv4 datagrams on an outbound interface Disabled DSCP priority of datagrams Not configured SYN-Wait timer for TCP connections 75s FIN-Wait timer for TCP connectio...
如果是发到本机的话,调用ip_local_deliver 函数,可能会做 de-fragment(合并多个 IP packet),然后调用ip_local_deliver函数。该函数根据 package 的下一个处理层的 protocal number,调用下一层接口,包括 tcp_v4_rcv (TCP), udp_rcv (UDP),icmp_rcv (ICMP),igmp_rcv(IGMP)。对于 TCP 来说,函数 tcp_v4_...
如果发到本机的话,调用 ip_local_deliver 函数,可能会做 de-fragment(合并多个包),并调用ip_local_deliver_finish。最后调用下一层接口,包括 tcp_v4_rcv (TCP), udp_rcv (UDP),icmp_rcv (ICMP),igmp_rcv(IGMP)。如果需要转发,则进入转发流程,调用 dev_queue_xmit,进入链路层处理流程。如果不是发送到本机...
如果是发到本机的话,调用ip_local_deliver 函数,可能会做 de-fragment(合并多个 IP packet),然后调用ip_local_deliver函数。该函数根据 package 的下一个处理层的 protocal number,调用下一层接口,包括 tcp_v4_rcv (TCP), udp_rcv (UDP),icmp_rcv (ICMP),igmp_rcv(IGMP)。对于 TCP 来说,函数 tcp_v4_...
The router has encountered overlap fragments. "Overlap fragment" means that the offset of one fragment overlaps the offset of another fragment. For example, if the offset of the first fragment is 0 and its length is 800, the offset of the second fragments offset must be 800. If the offset...
如果是发到本机的话,调用ip_local_deliver函数,可能会做 de-fragment(合并多个 IP packet),然后调用ip_local_deliver函数。该函数根据 package 的下一个处理层的 protocal number,调用下一层接口,包括tcp_v4_rcv(TCP), udp_rcv (UDP),icmp_rcv (ICMP),igmp_rcv(IGMP)。对于 TCP 来说,函数tcp_v4_rcv函数...
Accessibility Syntax Description ACD_Logged-off_LED Syntax Description ACD_Logged-on_LED Syntax Description ACD_Status_n_ Syntax Description Add_Contacts_to_Directory_Personal Syntax Description Allowed_APIs Syntax Description Assistant_Call_Filter