I have following query related to SNAT on VPP Release 19.0.1.02
following is the code from vpp/src/plugins/nat/in2out.c
static inline int
snat_not_translate (snat_main_t * sm, vlib_node_runtime_t * node,
u32 sw_if_index0, ip4_header_t * ip0, u32 proto0,
u32 rx_fib_index0, u32 thread_index)
{
udp_header_t *udp0 = ip4_next_header (ip0);
snat_session_key_t key0, sm0;
clib_bihash_kv_8_8_t kv0, value0;
key0.addr = ip0->dst_address;
key0.port = udp0->dst_port;
key0.protocol = proto0;
key0.fib_index = sm->outside_fib_index;
kv0.key = key0.as_u64;
/* NAT packet aimed at external address if */
/* has active sessions */
if (clib_bihash_search_8_8 (&sm->per_thread_data[thread_index].out2in,
&kv0,
&value0))
{
/* or is static mappings */
if (!snat_static_mapping_match (sm, key0, &sm0, 1, 0, 0, 0, 0, 0))
return 0;
}
else
return 0;
if (sm->forwarding_enabled)
return 1;
return snat_not_translate_fast (sm, node, sw_if_index0, ip0, proto0,
rx_fib_index0);
}
want to understand why above highlighted condition is there in code ?
this is causing SNAT to stop working the moment we enable forwarding.
what will be impact we comment this condition ?
-Shahid.
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