diff options
Diffstat (limited to 'vnet/vnet/ip/ip4_input.c')
| -rw-r--r-- | vnet/vnet/ip/ip4_input.c | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/vnet/vnet/ip/ip4_input.c b/vnet/vnet/ip/ip4_input.c index c5281c4eb1d..1c7d327dc18 100644 --- a/vnet/vnet/ip/ip4_input.c +++ b/vnet/vnet/ip/ip4_input.c @@ -328,6 +328,41 @@ ip4_input_inline (vlib_main_t * vm, return frame->n_vectors; } +/** \brief IPv4 input node. + @node ip4-input + + This is the IPv4 input node: validates ip4 header checksums, + verifies ip header lengths, discards pkts with expired TTLs, + and sends pkts to the set of ip feature nodes configured on + the rx interface. + + @param vm vlib_main_t corresponding to the current thread + @param node vlib_node_runtime_t + @param frame vlib_frame_t whose contents should be dispatched + + @par Graph mechanics: buffer metadata, next index usage + + @em Uses: + - ip_config_main_t cm corresponding to each pkt's dst address unicast / + multicast status. + - <code>b->current_config_index</code> corresponding to each pkt's + rx sw_if_index. + - This sets the per-packet graph trajectory, ensuring that + each packet visits the per-interface features in order. + + - <code>vnet_buffer(b)->sw_if_index[VLIB_RX]</code> + - Indicates the @c sw_if_index value of the interface that the + packet was received on. + + @em Sets: + - <code>vnet_buffer(b)->ip.adj_index[VLIB_TX]</code> + - The lookup result adjacency index. + + <em>Next Indices:</em> + - Dispatches pkts to the (first) feature node: + <code> vnet_get_config_data (... &next0 ...); </code> + or @c error-drop +*/ static uword ip4_input (vlib_main_t * vm, vlib_node_runtime_t * node, |