Here's a strategy: Use "show run" to identify graph nodes which are active when
passing traffic. Nodes of interest will have names like "ethernet-input,"
"ip4-input", etc.
Obviously, the string "ethernet-input" string comes from "somewhere". In
particular:
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (ethernet_input_node) = {
.name = "ethernet-input",
/* Takes a vector of packets. */
<snip>
};
You'll find a companion function declaration:
VLIB_NODE_FN (ethernet_input_node) (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * frame)
{
vnet_main_t *vnm = vnet_get_main ();
u32 *from = vlib_frame_vector_args (frame);
u32 n_packets = frame->n_vectors;
ethernet_input_trace (vm, node, frame);
if (frame->flags & ETH_INPUT_FRAME_F_SINGLE_SW_IF_IDX)
{
ethernet_input_frame_t *ef = vlib_frame_scalar_args (frame);
int ip4_cksum_ok = (frame->flags & ETH_INPUT_FRAME_F_IP4_CKSUM_OK) != 0;
vnet_hw_interface_t *hi = vnet_get_hw_interface (vnm, ef->hw_if_index);
eth_input_single_int (vm, node, hi, from, n_packets, ip4_cksum_ok);
}
else
ethernet_input_inline (vm, node, from, n_packets,
ETHERNET_INPUT_VARIANT_ETHERNET);
return n_packets;
}
That's the actual graph node dispatch function. At that point, it's a matter of
"using the Force and reading the Source..."
HTH... Dave
From: vpp-dev@lists.fd.io <vpp-dev@lists.fd.io> On Behalf Of hemant via
lists.fd.io
Sent: Thursday, September 24, 2020 8:06 PM
To: vpp-dev@lists.fd.io
Subject: [vpp-dev] pkt validation
Does VPP, in its ethernet, IP, and IPv6 input, include stock code to check for
malformed packet? Any pointer to such code would help so that I can look at
other code as well.
Thanks,
Hemant
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