dns.h File Reference

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Data Structures
struct	dns_pending_request_t
struct	dns_cache_entry_t
struct	dns_main_t

Macros
#define	DNS_CACHE_ENTRY_FLAG_VALID   (1<<0)
	we have Actual Data More...
#define	DNS_CACHE_ENTRY_FLAG_STATIC   (1<<1)
	static entry More...
#define	DNS_CACHE_ENTRY_FLAG_CNAME   (1<<2)
	CNAME (indirect) entry. More...
#define	DNS_RETRIES_PER_SERVER   3
#define	DNS_RESOLVER_EVENT_RESOLVED   1
#define	DNS_RESOLVER_EVENT_PENDING   2
#define	foreach_dns46_request_error
#define	foreach_dns46_reply_error

Enumerations
enum	dns_pending_request_type_t { DNS_API_PENDING_NAME_TO_IP = 1, DNS_API_PENDING_IP_TO_NAME, DNS_PEER_PENDING_NAME_TO_IP, DNS_PEER_PENDING_IP_TO_NAME }
enum	dns46_request_error_t { DNS46_REQUEST_N_ERROR }
enum	dns46_reply_error_t { DNS46_REPLY_N_ERROR }

Functions
void	vnet_send_dns_request (dns_main_t *dm, dns_cache_entry_t *ep)
int	vnet_dns_cname_indirection_nolock (dns_main_t *dm, u32 ep_index, u8 *reply)
	Handle cname indirection. More...
int	vnet_dns_delete_entry_by_index_nolock (dns_main_t *dm, u32 index)
int	vnet_dns_resolve_name (dns_main_t *dm, u8 *name, dns_pending_request_t *t, dns_cache_entry_t **retp)
void	vnet_dns_send_dns6_request (dns_main_t *dm, dns_cache_entry_t *ep, ip6_address_t *server)
void	vnet_dns_send_dns4_request (dns_main_t *dm, dns_cache_entry_t *ep, ip4_address_t *server)
void	vnet_send_dns4_reply (dns_main_t *dm, dns_pending_request_t *t, dns_cache_entry_t *ep, vlib_buffer_t *b0)
void	vnet_send_dns6_reply (dns_main_t *dm, dns_pending_request_t *t, dns_cache_entry_t *ep, vlib_buffer_t *b0)
u8 *	vnet_dns_labels_to_name (u8 *label, u8 *full_text, u8 **parse_from_here)
	arc-function for the above. More...
void	vnet_dns_create_resolver_process (dns_main_t *dm)
static void	dns_cache_lock (dns_main_t *dm, int tag)
static void	dns_cache_unlock (dns_main_t *dm)

Variables
dns_main_t	dns_main
vlib_node_registration_t	dns46_reply_node
	(constructor) VLIB_REGISTER_NODE (dns46_reply_node) More...
vlib_node_registration_t	dns4_request_node
	(constructor) VLIB_REGISTER_NODE (dns4_request_node) More...
vlib_node_registration_t	dns6_request_node
	(constructor) VLIB_REGISTER_NODE (dns6_request_node) More...
format_function_t	format_dns_reply

Macro Definition Documentation

DNS_CACHE_ENTRY_FLAG_CNAME

#define DNS_CACHE_ENTRY_FLAG_CNAME   (1<<2)

CNAME (indirect) entry.

Definition at line 83 of file dns.h.

DNS_CACHE_ENTRY_FLAG_STATIC

#define DNS_CACHE_ENTRY_FLAG_STATIC   (1<<1)

static entry

Definition at line 82 of file dns.h.

DNS_CACHE_ENTRY_FLAG_VALID

#define DNS_CACHE_ENTRY_FLAG_VALID   (1<<0)

we have Actual Data

Definition at line 81 of file dns.h.

DNS_RESOLVER_EVENT_PENDING

#define DNS_RESOLVER_EVENT_PENDING   2

Definition at line 88 of file dns.h.

DNS_RESOLVER_EVENT_RESOLVED

#define DNS_RESOLVER_EVENT_RESOLVED   1

Definition at line 87 of file dns.h.

DNS_RETRIES_PER_SERVER

#define DNS_RETRIES_PER_SERVER   3

Definition at line 85 of file dns.h.

foreach_dns46_reply_error

#define foreach_dns46_reply_error

Value:

_(DISABLED, "DNS pkts punted (feature disabled)")       \
_(PROCESSED, "DNS reply pkts processed")                \
_(NO_ELT, "No DNS pool element")                        \
_(FORMAT_ERROR, "DNS format errors")                    \
_(TEST_DROP, "DNS reply pkt dropped for test purposes") \
_(MULTIPLE_REPLY, "DNS multiple reply packets")         \
_(NO_UNRESOLVED_ENTRY, "No unresolved entry for pkt")

Definition at line 154 of file dns.h.

foreach_dns46_request_error

#define foreach_dns46_request_error

Value:

_(NONE, "No error")                                                     \
_(UNIMPLEMENTED, "Unimplemented")                                       \
_(PROCESSED, "DNS request pkts processed")                              \
_(IP_OPTIONS, "DNS pkts with ip options (dropped)")                     \
_(BAD_REQUEST, "DNS pkts with serious discrepancies (dropped)")         \
_(TOO_MANY_REQUESTS, "DNS pkts asking too many questions")              \
_(RESOLUTION_REQUIRED, "DNS pkts pending upstream name resolution")

Definition at line 137 of file dns.h.

Enumeration Type Documentation

dns46_reply_error_t

enum dns46_reply_error_t

Enumerator
DNS46_REPLY_N_ERROR

Definition at line 163 of file dns.h.

dns46_request_error_t

enum dns46_request_error_t

Enumerator
DNS46_REQUEST_N_ERROR

Definition at line 146 of file dns.h.

dns_pending_request_type_t

enum dns_pending_request_type_t

Enumerator
DNS_API_PENDING_NAME_TO_IP
DNS_API_PENDING_IP_TO_NAME
DNS_PEER_PENDING_NAME_TO_IP
DNS_PEER_PENDING_IP_TO_NAME

Definition at line 42 of file dns.h.

Function Documentation

dns_cache_lock()

static void dns_cache_lock ( dns_main_t *  dm, int  tag  )

inlinestatic

Definition at line 202 of file dns.h.

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dns_cache_unlock()

static void dns_cache_unlock ( dns_main_t *  dm )

inlinestatic

Definition at line 214 of file dns.h.

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vnet_dns_cname_indirection_nolock()

int vnet_dns_cname_indirection_nolock	(	dns_main_t *	dm,
		u32	ep_index,
		u8 *	reply
	)

Handle cname indirection.

JFC. Called with the cache locked. returns 0 if the reply is not a CNAME.

Definition at line 986 of file dns.c.

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vnet_dns_create_resolver_process()

void vnet_dns_create_resolver_process

(

dns_main_t *

dm

)

Definition at line 363 of file resolver_process.c.

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vnet_dns_delete_entry_by_index_nolock()

int vnet_dns_delete_entry_by_index_nolock	(	dns_main_t *	dm,
		u32	index
	)

Definition at line 682 of file dns.c.

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vnet_dns_labels_to_name()

u8* vnet_dns_labels_to_name	(	u8 *	label,
		u8 *	full_text,
		u8 **	parse_from_here
	)

arc-function for the above.

Translate "0x3 f o o 0x3 c o m 0x0" into "foo.com" Produces a non-NULL-terminated u8 *vector. v format is your friend.

Definition at line 516 of file dns.c.

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vnet_dns_resolve_name()

int vnet_dns_resolve_name	(	dns_main_t *	dm,
		u8 *	name,
		dns_pending_request_t *	t,
		dns_cache_entry_t **	retp
	)

Definition at line 830 of file dns.c.

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vnet_dns_send_dns4_request()

void vnet_dns_send_dns4_request	(	dns_main_t *	dm,
		dns_cache_entry_t *	ep,
		ip4_address_t *	server
	)

Definition at line 240 of file dns.c.

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vnet_dns_send_dns6_request()

void vnet_dns_send_dns6_request	(	dns_main_t *	dm,
		dns_cache_entry_t *	ep,
		ip6_address_t *	server
	)

Definition at line 359 of file dns.c.

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vnet_send_dns4_reply()

void vnet_send_dns4_reply	(	dns_main_t *	dm,
		dns_pending_request_t *	t,
		dns_cache_entry_t *	ep,
		vlib_buffer_t *	b0
	)

Definition at line 2777 of file dns.c.

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vnet_send_dns6_reply()

void vnet_send_dns6_reply	(	dns_main_t *	dm,
		dns_pending_request_t *	t,
		dns_cache_entry_t *	ep,
		vlib_buffer_t *	b0
	)

Definition at line 2769 of file dns.c.

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vnet_send_dns_request()

void vnet_send_dns_request	(	dns_main_t *	dm,
		dns_cache_entry_t *	ep
	)

Definition at line 558 of file dns.c.

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Variable Documentation

dns46_reply_node

vlib_node_registration_t dns46_reply_node

Initial value:

=
{
  .function = dns46_reply_node_fn,
  .name = "dns46_reply",
  .vector_size = sizeof (u32),
  .format_trace = format_dns46_reply_trace,
  .type = VLIB_NODE_TYPE_INTERNAL,
  .n_errors = ARRAY_LEN (dns46_reply_error_strings),
  .error_strings = dns46_reply_error_strings,
  .n_next_nodes = DNS46_REPLY_N_NEXT,
  .next_nodes = {
    [DNS46_REPLY_NEXT_DROP] = "error-drop",
    [DNS46_REPLY_NEXT_PUNT] = "error-punt",
  },
}

(constructor) VLIB_REGISTER_NODE (dns46_reply_node)

Definition at line 42 of file reply_node.c.

dns4_request_node

vlib_node_registration_t dns4_request_node

(constructor) VLIB_REGISTER_NODE (dns4_request_node)

Definition at line 293 of file request_node.c.

dns6_request_node

vlib_node_registration_t dns6_request_node

(constructor) VLIB_REGISTER_NODE (dns6_request_node)

Definition at line 320 of file request_node.c.

dns_main

dns_main_t dns_main

Definition at line 61 of file dns.c.

format_dns_reply

format_function_t format_dns_reply

Definition at line 199 of file dns.h.