Hello all,
I am knowing all 2.4 kernel network stack
packet buildup procedure. Now i am trying to analysing
same in
2.6.10 kernel. What i found is many changes to 2.6
kernel compare to 2.4. Theres is no ip_build_xmit
instead thers a new function that is
ip_append_data. What i want to know is from udp.c
file. Theres a udp protocol structure is defined
struct proto udp_prot = {
.name = "UDP",
.owner = THIS_MODULE,
.close = udp_close,
.connect = ip4_datagram_connect,
.disconnect = udp_disconnect,
.ioctl = udp_ioctl,
.destroy = udp_destroy_sock,
.setsockopt = udp_setsockopt,
.getsockopt = udp_getsockopt,
.sendmsg = udp_sendmsg,
.recvmsg = udp_recvmsg,
.sendpage = udp_sendpage,
.backlog_rcv = udp_queue_rcv_skb,
.hash = udp_v4_hash,
.unhash = udp_v4_unhash,
.get_port = udp_v4_get_port,
.slab_obj_size = sizeof(struct udp_sock),
};
I want to know for what purpose udp_sendpage is used
also whats significance of . in structure members?
Also why .slab_obj_size = sizeof(struct udp_sock)
defined in udp_prot?
Also where's packet size/space is allocated for UDP
packet?
Please help me to analyze code.
Thanks in advance.
linux_lover.
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