FD.io VPP  v18.01.2-1-g9b554f3
Vector Packet Processing
adj.h File Reference
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Data Structures

struct  ip_adjacency_t_
 IP unicast adjacency. More...
 

Macros

#define IP4_LOOKUP_NEXT_NODES
 
#define IP6_LOOKUP_NEXT_NODES
 

Typedefs

typedef void(* adj_midchain_fixup_t) (vlib_main_t *vm, struct ip_adjacency_t_ *adj, vlib_buffer_t *b0)
 A function type for post-rewrite fixups on midchain adjacency. More...
 
typedef enum ip_adjacency_flags_t_ adj_flags_t
 Flags on an IP adjacency. More...
 
typedef struct ip_adjacency_t_ ip_adjacency_t
 IP unicast adjacency. More...
 

Enumerations

enum  ip_lookup_next_t {
  IP_LOOKUP_NEXT_DROP, IP_LOOKUP_NEXT_PUNT, IP_LOOKUP_NEXT_LOCAL, IP_LOOKUP_NEXT_ARP,
  IP_LOOKUP_NEXT_GLEAN, IP_LOOKUP_NEXT_REWRITE, IP_LOOKUP_NEXT_MIDCHAIN, IP_LOOKUP_NEXT_ICMP_ERROR,
  IP_LOOKUP_NEXT_MCAST, IP_LOOKUP_NEXT_MCAST_MIDCHAIN, IP_LOOKUP_N_NEXT
}
 An adjacency is a representation of an attached L3 peer. More...
 
enum  ip4_lookup_next_t { IP4_LOOKUP_N_NEXT = IP_LOOKUP_N_NEXT }
 
enum  ip6_lookup_next_t { IP6_LOOKUP_NEXT_HOP_BY_HOP = IP_LOOKUP_N_NEXT, IP6_LOOKUP_NEXT_ADD_HOP_BY_HOP, IP6_LOOKUP_NEXT_POP_HOP_BY_HOP, IP6_LOOKUP_N_NEXT }
 
enum  ip_adjacency_flags_t_ { ADJ_FLAG_NONE = 0, ADJ_FLAG_SYNC_WALK_ACTIVE = (1 << 0), ADJ_FLAG_MIDCHAIN_NO_COUNT = (1 << 1) }
 Flags on an IP adjacency. More...
 

Functions

 STATIC_ASSERT ((STRUCT_OFFSET_OF(ip_adjacency_t, cacheline0)==0),"IP adjacency cachline 0 is not offset")
 
 STATIC_ASSERT ((STRUCT_OFFSET_OF(ip_adjacency_t, cacheline1)==CLIB_CACHE_LINE_BYTES),"IP adjacency cachline 1 is more than one cachline size offset")
 
void adj_lock (adj_index_t adj_index)
 Take a reference counting lock on the adjacency. More...
 
void adj_unlock (adj_index_t adj_index)
 Release a reference counting lock on the adjacency. More...
 
u32 adj_child_add (adj_index_t adj_index, fib_node_type_t type, fib_node_index_t child_index)
 Add a child dependent to an adjacency. More...
 
void adj_child_remove (adj_index_t adj_index, u32 sibling_index)
 Remove a child dependent. More...
 
void adj_walk (u32 sw_if_index, adj_walk_cb_t cb, void *ctx)
 Walk the Adjacencies on a given interface. More...
 
vnet_link_t adj_get_link_type (adj_index_t ai)
 Return the link type of the adjacency. More...
 
u32 adj_get_sw_if_index (adj_index_t ai)
 Return the sw interface index of the adjacency. More...
 
int adj_is_up (adj_index_t ai)
 Return true if the adjacency is 'UP', i.e. More...
 
const u8adj_get_rewrite (adj_index_t ai)
 Return the link type of the adjacency. More...
 
void adj_feature_update (u32 sw_if_index, u8 arc_index, u8 is_enable)
 Notify the adjacency subsystem that the features settings for an interface have changed. More...
 
static ip_adjacency_tadj_get (adj_index_t adj_index)
 Get a pointer to an adjacency object from its index. More...
 
static int adj_are_counters_enabled (void)
 Get the global configuration option for enabling per-adj counters. More...
 

Variables

ip_adjacency_tadj_pool
 The global adjacnecy pool. More...
 
vlib_combined_counter_main_t adjacency_counters
 Adjacency packet counters. More...
 
int adj_per_adj_counters
 Global Config for enabling per-adjacency counters This is configurable because it comes with a non-negligible performance cost. More...
 

Macro Definition Documentation

#define IP4_LOOKUP_NEXT_NODES
Value:
{ \
[IP_LOOKUP_NEXT_DROP] = "ip4-drop", \
[IP_LOOKUP_NEXT_PUNT] = "ip4-punt", \
[IP_LOOKUP_NEXT_LOCAL] = "ip4-local", \
[IP_LOOKUP_NEXT_ARP] = "ip4-arp", \
[IP_LOOKUP_NEXT_GLEAN] = "ip4-glean", \
[IP_LOOKUP_NEXT_REWRITE] = "ip4-rewrite", \
[IP_LOOKUP_NEXT_MCAST] = "ip4-rewrite-mcast", \
[IP_LOOKUP_NEXT_MIDCHAIN] = "ip4-midchain", \
[IP_LOOKUP_NEXT_MCAST_MIDCHAIN] = "ip4-mcast-midchain", \
[IP_LOOKUP_NEXT_ICMP_ERROR] = "ip4-icmp-error", \
}
Multicast Adjacency.
Definition: adj.h:82
This packet is to be rewritten and forwarded to the next processing node.
Definition: adj.h:73
Adjacency to punt this packet.
Definition: adj.h:55
This packet matches an "interface route" and packets need to be passed to ARP to find rewrite string ...
Definition: adj.h:68
This packet matches an "incomplete adjacency" and packets need to be passed to ARP to find rewrite st...
Definition: adj.h:63
Adjacency to drop this packet.
Definition: adj.h:53
Multicast Midchain Adjacency.
Definition: adj.h:86
This packets follow a mid-chain adjacency.
Definition: adj.h:76
This packets needs to go to ICMP error.
Definition: adj.h:79
This packet is for one of our own IP addresses.
Definition: adj.h:58

Definition at line 105 of file adj.h.

#define IP6_LOOKUP_NEXT_NODES
Value:
{ \
[IP_LOOKUP_NEXT_DROP] = "ip6-drop", \
[IP_LOOKUP_NEXT_PUNT] = "ip6-punt", \
[IP_LOOKUP_NEXT_LOCAL] = "ip6-local", \
[IP_LOOKUP_NEXT_ARP] = "ip6-discover-neighbor", \
[IP_LOOKUP_NEXT_GLEAN] = "ip6-glean", \
[IP_LOOKUP_NEXT_REWRITE] = "ip6-rewrite", \
[IP_LOOKUP_NEXT_MCAST] = "ip6-rewrite-mcast", \
[IP_LOOKUP_NEXT_MIDCHAIN] = "ip6-midchain", \
[IP_LOOKUP_NEXT_MCAST_MIDCHAIN] = "ip6-mcast-midchain", \
[IP_LOOKUP_NEXT_ICMP_ERROR] = "ip6-icmp-error", \
[IP6_LOOKUP_NEXT_HOP_BY_HOP] = "ip6-hop-by-hop", \
[IP6_LOOKUP_NEXT_ADD_HOP_BY_HOP] = "ip6-add-hop-by-hop", \
[IP6_LOOKUP_NEXT_POP_HOP_BY_HOP] = "ip6-pop-hop-by-hop", \
}
Multicast Adjacency.
Definition: adj.h:82
This packet is to be rewritten and forwarded to the next processing node.
Definition: adj.h:73
Adjacency to punt this packet.
Definition: adj.h:55
This packet matches an "interface route" and packets need to be passed to ARP to find rewrite string ...
Definition: adj.h:68
This packet matches an "incomplete adjacency" and packets need to be passed to ARP to find rewrite st...
Definition: adj.h:63
Adjacency to drop this packet.
Definition: adj.h:53
Multicast Midchain Adjacency.
Definition: adj.h:86
This packets follow a mid-chain adjacency.
Definition: adj.h:76
This packets needs to go to ICMP error.
Definition: adj.h:79
This packet is for one of our own IP addresses.
Definition: adj.h:58

Definition at line 118 of file adj.h.

Typedef Documentation

Flags on an IP adjacency.

typedef void(* adj_midchain_fixup_t) (vlib_main_t *vm, struct ip_adjacency_t_ *adj, vlib_buffer_t *b0)

A function type for post-rewrite fixups on midchain adjacency.

Definition at line 142 of file adj.h.

IP unicast adjacency.

Note
cache aligned.

An adjacency is a represenation of a peer on a particular link.

Enumeration Type Documentation

Enumerator
IP4_LOOKUP_N_NEXT 

Definition at line 91 of file adj.h.

Enumerator
IP6_LOOKUP_NEXT_HOP_BY_HOP 
IP6_LOOKUP_NEXT_ADD_HOP_BY_HOP 
IP6_LOOKUP_NEXT_POP_HOP_BY_HOP 
IP6_LOOKUP_N_NEXT 

Definition at line 96 of file adj.h.

Flags on an IP adjacency.

Enumerator
ADJ_FLAG_NONE 
ADJ_FLAG_SYNC_WALK_ACTIVE 

Currently a sync walk is active.

Used to prevent re-entrant walking

ADJ_FLAG_MIDCHAIN_NO_COUNT 

Packets TX through the midchain do not increment the interface counters.

This should be used when the adj is associated with an L2 interface and that L2 interface is in a bridege domain. In that case the packet will have traversed the interface's TX node, and hence have been counted, before it traverses ths midchain

Definition at line 149 of file adj.h.

An adjacency is a representation of an attached L3 peer.

Adjacency Sub-types:

  • neighbour: a representation of an attached L3 peer. Key:{addr,interface,link/ether-type} SHARED
  • glean: used to drive ARP/ND for packets destined to a local sub-net. 'glean' mean use the packet's destination address as the target address in the ARP packet. UNSHARED. Only one per-interface.
  • midchain: a nighbour adj on a virtual/tunnel interface.

The API to create and update the adjacency is very sub-type specific. This is intentional as it encourages the user to carefully consider which adjacency sub-type they are really using, and hence assign it data in the appropriate sub-type space in the union of sub-types. This prevents the adj becoming a disorganised dumping group for 'my features needs a u16 somewhere' data. It is important to enforce this approach as space in the adjacency is a premium, as we need it to fit in 1 cache line.

the API is also based around an index to an ajdacency not a raw pointer. This is so the user doesn't suffer the same limp inducing firearm injuries that the author suffered as the adjacenices can realloc.Common (IP4/IP6) next index stored in adjacency.

Enumerator
IP_LOOKUP_NEXT_DROP 

Adjacency to drop this packet.

IP_LOOKUP_NEXT_PUNT 

Adjacency to punt this packet.

IP_LOOKUP_NEXT_LOCAL 

This packet is for one of our own IP addresses.

IP_LOOKUP_NEXT_ARP 

This packet matches an "incomplete adjacency" and packets need to be passed to ARP to find rewrite string for this destination.

IP_LOOKUP_NEXT_GLEAN 

This packet matches an "interface route" and packets need to be passed to ARP to find rewrite string for this destination.

IP_LOOKUP_NEXT_REWRITE 

This packet is to be rewritten and forwarded to the next processing node.

This is typically the output interface but might be another node for further output processing.

IP_LOOKUP_NEXT_MIDCHAIN 

This packets follow a mid-chain adjacency.

IP_LOOKUP_NEXT_ICMP_ERROR 

This packets needs to go to ICMP error.

IP_LOOKUP_NEXT_MCAST 

Multicast Adjacency.

IP_LOOKUP_NEXT_MCAST_MIDCHAIN 

Multicast Midchain Adjacency.

An Adjacency for sending macst packets on a tunnel/virtual interface

IP_LOOKUP_N_NEXT 

Definition at line 50 of file adj.h.

Function Documentation

static int adj_are_counters_enabled ( void  )
inlinestatic

Get the global configuration option for enabling per-adj counters.

Definition at line 374 of file adj.h.

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u32 adj_child_add ( adj_index_t  adj_index,
fib_node_type_t  type,
fib_node_index_t  child_index 
)

Add a child dependent to an adjacency.

The child will thus be informed via its registerd back-walk function when the adjacency state changes.

Definition at line 258 of file adj.c.

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void adj_child_remove ( adj_index_t  adj_index,
u32  sibling_index 
)

Remove a child dependent.

Definition at line 275 of file adj.c.

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void adj_feature_update ( u32  sw_if_index,
u8  arc_index,
u8  is_enable 
)

Notify the adjacency subsystem that the features settings for an interface have changed.

Definition at line 326 of file adj.c.

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static ip_adjacency_t* adj_get ( adj_index_t  adj_index)
inlinestatic

Get a pointer to an adjacency object from its index.

Definition at line 365 of file adj.h.

vnet_link_t adj_get_link_type ( adj_index_t  ai)

Return the link type of the adjacency.

Definition at line 365 of file adj.c.

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const u8* adj_get_rewrite ( adj_index_t  ai)

Return the link type of the adjacency.

Return the link type of the adjacency.

Definition at line 418 of file adj.c.

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u32 adj_get_sw_if_index ( adj_index_t  ai)

Return the sw interface index of the adjacency.

Definition at line 378 of file adj.c.

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int adj_is_up ( adj_index_t  ai)

Return true if the adjacency is 'UP', i.e.

can be used for forwarding. 0 is down, !0 is up.

can be used for forwarding 0 is down, !0 is up.

Definition at line 392 of file adj.c.

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void adj_lock ( adj_index_t  adj_index)

Take a reference counting lock on the adjacency.

Definition at line 222 of file adj.c.

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void adj_unlock ( adj_index_t  adj_index)

Release a reference counting lock on the adjacency.

Definition at line 239 of file adj.c.

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void adj_walk ( u32  sw_if_index,
adj_walk_cb_t  cb,
void *  ctx 
)

Walk the Adjacencies on a given interface.

Definition at line 345 of file adj.c.

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STATIC_ASSERT ( (STRUCT_OFFSET_OF(ip_adjacency_t, cacheline0)==0)  ,
"IP adjacency cachline 0 is not offset  
)
STATIC_ASSERT ( (STRUCT_OFFSET_OF(ip_adjacency_t, cacheline1)==CLIB_CACHE_LINE_BYTES ,
"IP adjacency cachline 1 is more than one cachline size offset  
)

Variable Documentation

int adj_per_adj_counters

Global Config for enabling per-adjacency counters This is configurable because it comes with a non-negligible performance cost.

Global Config for enabling per-adjacency counters This is configurable because it comes with a non-negligible performance cost.

By default these are disabled.

Definition at line 36 of file adj.c.

ip_adjacency_t* adj_pool

The global adjacnecy pool.

Exposed for fast/inline data-plane access

Definition at line 30 of file adj.c.

vlib_combined_counter_main_t adjacency_counters

Adjacency packet counters.

Definition at line 25 of file adj.c.