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Vector Packet Processing
ip4_input.c File Reference
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Data Structures

struct  ip4_input_trace_t
 

Functions

static u8format_ip4_input_trace (u8 *s, va_list *va)
 
static_always_inline u32 ip4_input_set_next (u32 sw_if_index, vlib_buffer_t *b, int arc_enabled)
 
static_always_inline void ip4_input_check_sw_if_index (vlib_main_t *vm, vlib_simple_counter_main_t *cm, u32 sw_if_index, u32 *last_sw_if_index, u32 *cnt, int *arc_enabled)
 
static uword ip4_input_inline (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame, int verify_checksum)
 
VLIB_NODE_FN() ip4_input_node (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
 IPv4 input node. More...
 
VLIB_NODE_FN() ip4_input_no_checksum_node (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
 
static clib_error_tip4_init (vlib_main_t *vm)
 

Variables

char * ip4_error_strings []
 
vlib_node_registration_t ip4_input_node
 (constructor) VLIB_REGISTER_NODE (ip4_input_node) More...
 
vlib_node_registration_t ip4_input_no_checksum_node
 (constructor) VLIB_REGISTER_NODE (ip4_input_no_checksum_node) More...
 

Function Documentation

static u8* format_ip4_input_trace ( u8 s,
va_list *  va 
)
static

Definition at line 52 of file ip4_input.c.

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static clib_error_t* ip4_init ( vlib_main_t vm)
static

Definition at line 350 of file ip4_input.c.

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static_always_inline void ip4_input_check_sw_if_index ( vlib_main_t vm,
vlib_simple_counter_main_t cm,
u32  sw_if_index,
u32 last_sw_if_index,
u32 cnt,
int *  arc_enabled 
)

Definition at line 93 of file ip4_input.c.

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static uword ip4_input_inline ( vlib_main_t vm,
vlib_node_runtime_t node,
vlib_frame_t frame,
int  verify_checksum 
)
inlinestatic

Definition at line 123 of file ip4_input.c.

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VLIB_NODE_FN() ip4_input_no_checksum_node ( vlib_main_t vm,
vlib_node_runtime_t node,
vlib_frame_t frame 
)

Definition at line 302 of file ip4_input.c.

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VLIB_NODE_FN() ip4_input_node ( vlib_main_t vm,
vlib_node_runtime_t node,
vlib_frame_t frame 
)

IPv4 input node.

Node Identifier:
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.

Parameters
vmvlib_main_t corresponding to the current thread
nodevlib_node_runtime_t
framevlib_frame_t whose contents should be dispatched
Graph mechanics: buffer metadata, next index usage

Uses:

  • vnet_feature_config_main_t cm corresponding to each pkt's dst address unicast / multicast status.
  • b->current_config_index 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.
  • vnet_buffer(b)->sw_if_index[VLIB_RX]
    • Indicates the sw_if_index value of the interface that the packet was received on.

Sets:

  • vnet_buffer(b)->ip.adj_index[VLIB_TX]
    • The lookup result adjacency index.

Next Indices:

  • Dispatches pkts to the (first) feature node: vnet_get_config_data (... &next0 ...); or error-drop

Definition at line 296 of file ip4_input.c.

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static_always_inline u32 ip4_input_set_next ( u32  sw_if_index,
vlib_buffer_t b,
int  arc_enabled 
)

Definition at line 66 of file ip4_input.c.

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Variable Documentation

char* ip4_error_strings[]
Initial value:
= {
#define _(sym,string)
}
#define foreach_ip4_error
Definition: ip4_error.h:43

Definition at line 310 of file ip4_input.c.

vlib_node_registration_t ip4_input_no_checksum_node
Initial value:
= {
.name = "ip4-input-no-checksum",
.vector_size = sizeof (u32),
.sibling_of = "ip4-input",
.format_buffer = format_ip4_header,
.format_trace = format_ip4_input_trace,
}
format_function_t format_ip4_header
Definition: format.h:89
unsigned int u32
Definition: types.h:88
static u8 * format_ip4_input_trace(u8 *s, va_list *va)
Definition: ip4_input.c:52

(constructor) VLIB_REGISTER_NODE (ip4_input_no_checksum_node)

Definition at line 339 of file ip4_input.c.

vlib_node_registration_t ip4_input_node
Initial value:
= {
.name = "ip4-input",
.vector_size = sizeof (u32),
.n_errors = IP4_N_ERROR,
.error_strings = ip4_error_strings,
.n_next_nodes = IP4_INPUT_N_NEXT,
.next_nodes = {
[IP4_INPUT_NEXT_DROP] = "error-drop",
[IP4_INPUT_NEXT_PUNT] = "error-punt",
[IP4_INPUT_NEXT_OPTIONS] = "ip4-options",
[IP4_INPUT_NEXT_LOOKUP] = "ip4-lookup",
[IP4_INPUT_NEXT_LOOKUP_MULTICAST] = "ip4-mfib-forward-lookup",
[IP4_INPUT_NEXT_ICMP_ERROR] = "ip4-icmp-error",
[IP4_INPUT_NEXT_REASSEMBLY] = "ip4-reassembly",
},
.format_buffer = format_ip4_header,
.format_trace = format_ip4_input_trace,
}
format_function_t format_ip4_header
Definition: format.h:89
char * ip4_error_strings[]
Definition: ip4_input.c:310
unsigned int u32
Definition: types.h:88
static u8 * format_ip4_input_trace(u8 *s, va_list *va)
Definition: ip4_input.c:52

(constructor) VLIB_REGISTER_NODE (ip4_input_node)

Global ip4 input node.

Definition at line 317 of file ip4_input.c.