In, my project, i want when OVS receive a specific packet, i can instantly
add my flow to userspace flowtable. I know this is so silly, but i used
system() funtion in stdlib.h to execute “ovs-ofctl add-flow myflow” to add
my flow. And result is when OVS run to system() funtion, process that call
add flow command to be hang, and whole OVS is hang too.
Now, i would like ask : does OVS provide any api to add flow or is there a
way to add flow directly to flowtable in userspace ?
I add my modification to connmgr_send_async_msg() in ovs/ofproto/connmgr.c,
it looks like this :
void connmgr_send_async_msg(struct connmgr *mgr, const struct
ofproto_async_msg *am)
{
struct dp_packet packet_in; // this is packet comes in OVS
// then i get interface name, MAC, IPv4, TCP port of packet_in into
//in, out, sMAC, dMAC, sIP, dIP, sPort, dPort
char cmd[1000]; // command i want pass to system()
snprintf(bar1, sizeof(bar1), "ovs-ofctl add-flow s1
priority=5,tcp,in_port=\"%s\",eth_src=%s,eth_dst=%s,
ipv4_src=%s,ipv4_dst=%s,tcp_src=%u,tcp_dst=%u,action=output:\"%s\""
,in ,sMAC ,dMAC, sIP, dIP, sPort, dPort, out); // pass agr
to cmd
// call system() funtion with cmd
int systemRet1 = system(cmd);
...............................// normal OVS source code
}
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