Hi,
I very quickly read your email, but the first thing that popped to mind
is that your source host might be rejecting
the packets because the destination mac and ip addresses of the packets
don't match the ones of the host receiving
the packets. Maybe you want to try modifying those fields as well to
match the host that you want to receive the packets
and try again.
Niky
Sriram wrote:
Hi All
I have been trying to add a flow entry to the switch when I receive a
datapath_join_event using switch.cc component. My set of actions
include (set_nw_tos,set_tp_port and output). When a packet arrives, I
modify the ToS bit, Src/Dst port using set of actions and want to send
the packet back to the same host using OFPP_IN_PORT. However, I am not
receiving the packet back in my input port (source host). When I
replace the OFPP_IN_PORT with OFPP_FLOOD and check in the destination
host, I can see that the ToS, Src and Dst Port getting modified.
I use the following code to install the flow:
struct ofp_flow_mod *ofm = (struct ofp_flow_mod *)malloc(sizeof(struct
ofp_flow_mod)+(4*sizeof(struct ofp_action_header));
ofm->header.version = OFP_VERSION;
ofm->header.type = OFPT_FLOW_MOD;
ofm->header.length = htons(sizeof(struct ofp_flow_mod)+
action_length*sizeof(struct ofp_action_header));
ofm->match.wildcards = htonl(1<<20 | 1<<1);
ofm->match.in_port = htons(1);
ofm->match.dl_src[0] = 0x08;
ofm->match.dl_src[1] = 0x00;
ofm->match.dl_src[2] = 0x27;
ofm->match.dl_src[3] = 0x7c;
ofm->match.dl_src[4] = 0xe5;
ofm->match.dl_src[5] = 0xb8;
ofm->match.dl_dst[0] = 0x08;
ofm->match.dl_dst[1] = 0x00;
ofm->match.dl_dst[2] = 0x27;
ofm->match.dl_dst[3] = 0x86;
ofm->match.dl_dst[4] = 0xfb;
ofm->match.dl_dst[5] = 0x92;
ofm->match.dl_type = htons(0x800);
ofm->match.nw_proto = 6;
ofm->match.pad1[0] = (uint8_t)0;
ofm->match.nw_tos = 0x10;
ofm->match.nw_src = (inet_addr(SRC_IP));
ofm->match.nw_dst = (inet_addr(DST_IP));
ofm->match.tp_src = htons(SRC_PORT);
ofm->match.tp_dst = htons(DST_PORT);
ofm->match.pad2[0] = 0;
ofm->match.pad2[1] = 0;
ofm->cookie = htonl(0);
ofm->command = htons(OFPFC_ADD);
ofm->buffer_id = htonl(UINT32_MAX);
ofm->idle_timeout = htons(OFP_FLOW_PERMANENT);
ofm->hard_timeout = htons(OFP_FLOW_PERMANENT);
ofm->priority = htons(OFP_DEFAULT_PRIORITY);
ofm->flags = htons(ofd_flow_mod_flags());
ofm->out_port = htons(OFPP_NONE);
/* Handling Set of Actions */
// SET NW TOS
ofp_action_nw_tos *nw_tos = (ofp_action_nw_tos
*)malloc(sizeof(ofp_action_nw_tos));
nw_tos->type = htons(OFPAT_SET_NW_TOS);
nw_tos->len = htons(sizeof(ofp_action_nw_tos));
nw_tos->nw_tos = 0x11;
// SET NW TP SRC
ofp_action_tp_port *tp_src = (ofp_action_tp_port
*)malloc(sizeof(ofp_action_tp_port));
tp_src->type = htons(OFPAT_SET_TP_SRC);
tp_src->len = htons(sizeof(ofp_action_tp_port));
tp_src->tp_port = htons(1234);
// SET NW TP DST
ofp_action_tp_port *tp_dst = (ofp_action_tp_port
*)malloc(sizeof(ofp_action_tp_port));
tp_dst->type = htons(OFPAT_SET_TP_DST);
tp_dst->len = htons(sizeof(ofp_action_tp_port));
tp_dst->tp_port = htons(4100);
// OUTPUT ACTION
ofp_action_output *action = (ofp_action_output
*)malloc(sizeof(ofp_action_output));
action->type = htons(OFPAT_OUTPUT);
action->len = htons(sizeof(ofp_action_output));
action->port = htons(OFPP_IN_PORT); ///WHEN I REPLACE WITH OFPP_FLOOD,
i receive the packet in the destination host with the above actions
getting modified. However, I want to set the above actions and send it
back to the source host./
action->max_len = htons(0);
memcpy(action_type, (unsigned char *)nw_tos, sizeof(ofp_action_nw_tos));
memcpy(action_type + sizeof(ofp_action_nw_tos), (unsigned char
*)tp_src, sizeof(ofp_action_tp_port));
memcpy(action_type + sizeof(ofp_action_nw_tos) +
sizeof(ofp_action_tp_port), (unsigned char *)tp_dst,
sizeof(ofp_action_tp_port));
memcpy(action_type + sizeof(ofp_action_nw_tos) +
sizeof(ofp_action_tp_port)+ sizeof(ofp_action_tp_port), (unsigned char
*)action, sizeof(ofp_action_output));
memcpy(ofm->actions, action_type, no_of_actions_len);
send_openflow_command(dje.datapath_id, &ofm->header, true);
I checked in wireshark to verify the flow mod and it seems to work
correctly. I am running my host machines in VirtualBox VMs and the
switch (OpenFlow 1.0) is running in my host system.
Is there something that I am missing?
Thanks
Sriram
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