diff --git a/libknet/libknet.h b/libknet/libknet.h
index 50ed70dd..d16eb5d4 100644
--- a/libknet/libknet.h
+++ b/libknet/libknet.h
@@ -1,2176 +1,2182 @@
/*
* Copyright (C) 2010-2019 Red Hat, Inc. All rights reserved.
*
* Authors: Fabio M. Di Nitto <fabbione@kronosnet.org>
* Federico Simoncelli <fsimon@kronosnet.org>
*
* This software licensed under GPL-2.0+, LGPL-2.0+
*/
#ifndef __LIBKNET_H__
#define __LIBKNET_H__
#include <stdint.h>
#include <time.h>
#include <netinet/in.h>
#include <unistd.h>
#include <limits.h>
/**
* @file libknet.h
* @brief kronosnet API include file
* @copyright Copyright (C) 2010-2019 Red Hat, Inc. All rights reserved.
*
* Kronosnet is an advanced VPN system for High Availability applications.
*/
#define KNET_API_VER 1
/*
* libknet limits
*/
/*
* Maximum number of hosts
*/
typedef uint16_t knet_node_id_t;
#define KNET_MAX_HOST 65536
/*
* Maximum number of links between 2 hosts
*/
#define KNET_MAX_LINK 8
/*
* Maximum packet size that should be written to datafd
* see knet_handle_new for details
*/
#define KNET_MAX_PACKET_SIZE 65536
/*
* Buffers used for pretty logging
* host is used to store both ip addresses and hostnames
*/
#define KNET_MAX_HOST_LEN 256
#define KNET_MAX_PORT_LEN 6
/*
* Some notifications can be generated either on TX or RX
*/
#define KNET_NOTIFY_TX 0
#define KNET_NOTIFY_RX 1
/*
* Link flags
*/
/*
* Where possible, set traffic priority to high.
* On Linux this sets the TOS to INTERACTIVE (6),
* see tc-prio(8) for more infomation
*/
#define KNET_LINK_FLAG_TRAFFICHIPRIO (1ULL << 0)
/*
* Handle flags
*/
/*
* Use privileged operations during socket setup.
*/
#define KNET_HANDLE_FLAG_PRIVILEGED (1ULL << 0)
typedef struct knet_handle *knet_handle_t;
/*
* Handle structs/API calls
*/
/**
* knet_handle_new_ex
*
* @brief create a new instance of a knet handle
*
* host_id - Each host in a knet is identified with a unique
* ID. when creating a new handle local host_id
* must be specified (0 to UINT16_MAX are all valid).
* It is the user's responsibility to check that the value
* is unique, or bad things might happen.
*
* log_fd - Write file descriptor. If set to a value > 0, it will be used
* to write log packets from libknet to the application.
* Setting to 0 will disable logging from libknet.
* It is possible to enable logging at any given time (see logging API).
* Make sure to either read from this filedescriptor properly and/or
* mark it O_NONBLOCK, otherwise if the fd becomes full, libknet could
* block.
* It is strongly encouraged to use pipes (ex: pipe(2) or pipe2(2)) for
* logging fds due to the atomic nature of writes between fds.
* See also libknet test suite for reference and guidance.
*
* default_log_level -
* If logfd is specified, it will initialize all subsystems to log
* at default_log_level value. (see logging API)
*
* flags - bitwise OR of some of the following flags:
* KNET_HANDLE_FLAG_PRIVILEGED: use privileged operations setting up the
* communication sockets. If disabled, failure to acquire large
* enough socket buffers is ignored but logged. Inadequate buffers
* lead to poor performance.
*
* @return
* on success, a new knet_handle_t is returned.
* on failure, NULL is returned and errno is set.
* knet-specific errno values:
* ENAMETOOLONG - socket buffers couldn't be set big enough and KNET_HANDLE_FLAG_PRIVILEGED was specified
* ERANGE - buffer size readback returned unexpected type
*/
knet_handle_t knet_handle_new_ex(knet_node_id_t host_id,
int log_fd,
uint8_t default_log_level,
uint64_t flags);
/**
* knet_handle_new
*
* @brief knet_handle_new_ex with flags = KNET_HANDLE_FLAG_PRIVILEGED.
*/
knet_handle_t knet_handle_new(knet_node_id_t host_id,
int log_fd,
uint8_t default_log_level);
/**
* knet_handle_free
*
* @brief Destroy a knet handle, free all resources
*
* knet_h - pointer to knet_handle_t
*
* @return
* knet_handle_free returns
* 0 on success
* -1 on error and errno is set.
*/
int knet_handle_free(knet_handle_t knet_h);
/**
* knet_handle_enable_sock_notify
*
* @brief Register a callback to receive socket events
*
* knet_h - pointer to knet_handle_t
*
* sock_notify_fn_private_data
* void pointer to data that can be used to identify
* the callback.
*
* sock_notify_fn
* A callback function that is invoked every time
* a socket in the datafd pool will report an error (-1)
* or an end of read (0) (see socket.7).
* This function MUST NEVER block or add substantial delays.
* The callback is invoked in an internal unlocked area
* to allow calls to knet_handle_add_datafd/knet_handle_remove_datafd
* to swap/replace the bad fd.
* if both err and errno are 0, it means that the socket
* has received a 0 byte packet (EOF?).
* The callback function must either remove the fd from knet
* (by calling knet_handle_remove_fd()) or dup a new fd in its place.
* Failure to do this can cause problems.
*
* @return
* knet_handle_enable_sock_notify returns
* 0 on success
* -1 on error and errno is set.
*/
int knet_handle_enable_sock_notify(knet_handle_t knet_h,
void *sock_notify_fn_private_data,
void (*sock_notify_fn) (
void *private_data,
int datafd,
int8_t channel,
uint8_t tx_rx,
int error,
int errorno)); /* sorry! can't call it errno ;) */
#define KNET_DATAFD_MAX 32
/**
* knet_handle_add_datafd
*
* @brief Install a file descriptor for communication
*
* IMPORTANT: In order to add datafd to knet, knet_handle_enable_sock_notify
* _MUST_ be set and be able to handle both errors (-1) and
* 0 bytes read / write from the provided datafd.
* On read error (< 0) from datafd, the socket is automatically
* removed from polling to avoid spinning on dead sockets.
* It is safe to call knet_handle_remove_datafd even on sockets
* that have been removed.
*
* knet_h - pointer to knet_handle_t
*
* *datafd - read/write file descriptor.
* knet will read data here to send to the other hosts
* and will write data received from the network.
* Each data packet can be of max size KNET_MAX_PACKET_SIZE!
* Applications using knet_send/knet_recv will receive a
* proper error if the packet size is not within boundaries.
* Applications using their own functions to write to the
* datafd should NOT write more than KNET_MAX_PACKET_SIZE.
*
* Please refer to handle.c on how to set up a socketpair.
*
* datafd can be 0, and knet_handle_add_datafd will create a properly
* populated socket pair the same way as ping_test, or a value
* higher than 0. A negative number will return an error.
* On exit knet_handle_free will take care to cleanup the
* socketpair only if they have been created by knet_handle_add_datafd.
*
* It is possible to pass either sockets or normal fds.
* User provided datafd will be marked as non-blocking and close-on-exec.
*
* *channel - This value is analogous to the tag in VLAN tagging.
* A negative value will auto-allocate a channel.
* Setting a value between 0 and 31 will try to allocate that
* specific channel (unless already in use).
*
* It is possible to add up to 32 datafds but be aware that each
* one of them must have a receiving end on the other host.
*
* Example:
* hostA channel 0 will be delivered to datafd on hostB channel 0
* hostA channel 1 to hostB channel 1.
*
* Each channel must have a unique file descriptor.
*
* If your application could have 2 channels on one host and one
* channel on another host, then you can use dst_host_filter
* to manipulate channel values on TX and RX.
*
* @return
* knet_handle_add_datafd returns
* @retval 0 on success,
* *datafd will be populated with a socket if the original value was 0
* or if a specific fd was set, the value is untouched.
* *channel will be populated with a channel number if the original value
* was negative or the value is untouched if a specific channel
* was requested.
*
* @retval -1 on error and errno is set.
* *datafd and *channel are untouched or empty.
*/
int knet_handle_add_datafd(knet_handle_t knet_h, int *datafd, int8_t *channel);
/**
* knet_handle_remove_datafd
*
* @brief Remove a file descriptor from knet
*
* knet_h - pointer to knet_handle_t
*
* datafd - file descriptor to remove.
* NOTE that if the socket/fd was created by knet_handle_add_datafd,
* the socket will be closed by libknet.
*
* @return
* knet_handle_remove_datafd returns
* 0 on success
* -1 on error and errno is set.
*/
int knet_handle_remove_datafd(knet_handle_t knet_h, int datafd);
/**
* knet_handle_get_channel
*
* @brief Get the channel associated with a file descriptor
*
* knet_h - pointer to knet_handle_t
*
* datafd - get the channel associated to this datafd
*
* *channel - will contain the result
*
* @return
* knet_handle_get_channel returns
* @retval 0 on success
* and *channel will contain the result
* @retval -1 on error and errno is set.
* and *channel content is meaningless
*/
int knet_handle_get_channel(knet_handle_t knet_h, const int datafd, int8_t *channel);
/**
* knet_handle_get_datafd
*
* @brief Get the file descriptor associated with a channel
*
* knet_h - pointer to knet_handle_t
*
* channel - get the datafd associated to this channel
*
* *datafd - will contain the result
*
* @return
* knet_handle_get_datafd returns
* @retval 0 on success
* and *datafd will contain the results
* @retval -1 on error and errno is set.
* and *datafd content is meaningless
*/
int knet_handle_get_datafd(knet_handle_t knet_h, const int8_t channel, int *datafd);
/**
* knet_recv
*
* @brief Receive data from knet nodes
*
* knet_h - pointer to knet_handle_t
*
* buff - pointer to buffer to store the received data
*
* buff_len - buffer length
*
* channel - channel number
*
* @return
* knet_recv is a commodity function to wrap iovec operations
* around a socket. It returns a call to readv(2).
*/
ssize_t knet_recv(knet_handle_t knet_h,
char *buff,
const size_t buff_len,
const int8_t channel);
/**
* knet_send
*
* @brief Send data to knet nodes
*
* knet_h - pointer to knet_handle_t
*
* buff - pointer to the buffer of data to send
*
* buff_len - length of data to send
*
* channel - channel number
*
* @return
* knet_send is a commodity function to wrap iovec operations
* around a socket. It returns a call to writev(2).
*/
ssize_t knet_send(knet_handle_t knet_h,
const char *buff,
const size_t buff_len,
const int8_t channel);
/**
* knet_send_sync
*
* @brief Synchronously send data to knet nodes
*
* knet_h - pointer to knet_handle_t
*
* buff - pointer to the buffer of data to send
*
* buff_len - length of data to send
*
* channel - data channel to use (see knet_handle_add_datafd(3))
*
* All knet RX/TX operations are async for performance reasons.
* There are applications that might need a sync version of data
* transmission and receive errors in case of failure to deliver
* to another host.
* knet_send_sync bypasses the whole TX async layer and delivers
* data directly to the link layer, and returns errors accordingly.
* knet_send_sync sends only one packet to one host at a time.
* It does NOT support multiple destinations or multicast packets.
* Decision is still based on dst_host_filter_fn.
*
* @return
* knet_send_sync returns 0 on success and -1 on error.
* In addition to normal sendmmsg errors, knet_send_sync can fail
* due to:
*
* @retval ECANCELED - data forward is disabled
* @retval EFAULT - dst_host_filter fatal error
* @retval EINVAL - dst_host_filter did not provide dst_host_ids_entries on unicast pckts
* @retval E2BIG - dst_host_filter did return more than one dst_host_ids_entries on unicast pckts
* @retval ENOMSG - received unknown message type
* @retval EHOSTDOWN - unicast pckt cannot be delivered because dest host is not connected yet
* @retval ECHILD - crypto failed
* @retval EAGAIN - sendmmsg was unable to send all messages and there was no progress during retry
*/
int knet_send_sync(knet_handle_t knet_h,
const char *buff,
const size_t buff_len,
const int8_t channel);
/**
* knet_handle_enable_filter
*
* @brief install a filter to route packets
*
* knet_h - pointer to knet_handle_t
*
* dst_host_filter_fn_private_data
* void pointer to data that can be used to identify
* the callback.
*
* dst_host_filter_fn -
* is a callback function that is invoked every time
* a packet hits datafd (see knet_handle_new(3)).
* the function allows users to tell libknet where the
* packet has to be delivered.
*
* const unsigned char *outdata - is a pointer to the
* current packet
* ssize_t outdata_len - length of the above data
* uint8_t tx_rx - filter is called on tx or rx
* (KNET_NOTIFY_TX, KNET_NOTIFY_RX)
* knet_node_id_t this_host_id - host_id processing the packet
* knet_node_id_t src_host_id - host_id that generated the
* packet
* knet_node_id_t *dst_host_ids - array of KNET_MAX_HOST knet_node_id_t
* where to store the destinations
* size_t *dst_host_ids_entries - number of hosts to send the message
*
* dst_host_filter_fn should return
* -1 on error, packet is discarded.
* 0 packet is unicast and should be sent to dst_host_ids and there are
* dst_host_ids_entries in the buffer.
* 1 packet is broadcast/multicast and is sent all hosts.
* contents of dst_host_ids and dst_host_ids_entries are ignored.
* (see also kronosnetd/etherfilter.* for an example that filters based
* on ether protocol)
*
* @return
* knet_handle_enable_filter returns
* 0 on success
* -1 on error and errno is set.
*/
int knet_handle_enable_filter(knet_handle_t knet_h,
void *dst_host_filter_fn_private_data,
int (*dst_host_filter_fn) (
void *private_data,
const unsigned char *outdata,
ssize_t outdata_len,
uint8_t tx_rx,
knet_node_id_t this_host_id,
knet_node_id_t src_host_id,
int8_t *channel,
knet_node_id_t *dst_host_ids,
size_t *dst_host_ids_entries));
/**
* knet_handle_setfwd
*
* @brief Start packet forwarding
*
* knet_h - pointer to knet_handle_t
*
* enable - set to 1 to allow data forwarding, 0 to disable data forwarding.
*
* @return
* knet_handle_setfwd returns
* 0 on success
* -1 on error and errno is set.
*
* By default data forwarding is off and no traffic will pass through knet until
* it is set on.
*/
int knet_handle_setfwd(knet_handle_t knet_h, unsigned int enabled);
/**
* knet_handle_enable_access_lists
*
* @brief Enable or disable usage of access lists (default: off)
*
* knet_h - pointer to knet_handle_t
*
* enable - set to 1 to use access lists, 0 to disable access_lists.
*
* @return
* knet_handle_enable_access_lists returns
* 0 on success
* -1 on error and errno is set.
*
* access lists are bound to links. There are 2 types of links:
* 1) point to point, where both source and destinations are well known
* at configuration time.
* 2) open links, where only the source is known at configuration time.
*
* knet will automatically generate access lists for point to point links.
*
* For open links, knet provides 4 API calls to manipulate access lists:
* knet_link_add_acl(3), knet_link_rm_acl(3), knet_link_insert_acl(3)
* and knet_link_clear_acl(3).
* Those API calls will work exclusively on open links as they
* are of no use on point to point links.
*
* knet will not enforce any access list unless specifically enabled by
* knet_handle_enable_access_lists(3).
*
* From a security / programming perspective we recommend:
* - create the knet handle
* - enable access lists
* - configure hosts and links
* - configure access lists for open links
*/
int knet_handle_enable_access_lists(knet_handle_t knet_h, unsigned int enabled);
#define KNET_PMTUD_DEFAULT_INTERVAL 60
/**
* knet_handle_pmtud_setfreq
*
* @brief Set the interval between PMTUd scans
*
* knet_h - pointer to knet_handle_t
*
* interval - define the interval in seconds between PMTUd scans
* range from 1 to 86400 (24h)
*
* @return
* knet_handle_pmtud_setfreq returns
* 0 on success
* -1 on error and errno is set.
*
* default interval is 60.
*/
int knet_handle_pmtud_setfreq(knet_handle_t knet_h, unsigned int interval);
/**
* knet_handle_pmtud_getfreq
*
* @brief Get the interval between PMTUd scans
*
* knet_h - pointer to knet_handle_t
*
* interval - pointer where to store the current interval value
*
* @return
* knet_handle_pmtud_setfreq returns
* 0 on success
* -1 on error and errno is set.
*/
int knet_handle_pmtud_getfreq(knet_handle_t knet_h, unsigned int *interval);
/**
* knet_handle_enable_pmtud_notify
*
* @brief install a callback to receive PMTUd changes
*
* knet_h - pointer to knet_handle_t
*
* pmtud_notify_fn_private_data
* void pointer to data that can be used to identify
* the callback.
*
* pmtud_notify_fn
* is a callback function that is invoked every time
* a path MTU size change is detected.
* The function allows libknet to notify the user
* of data MTU, that's the max value that can be send
* onwire without fragmentation. The data MTU will always
* be lower than real link MTU because it accounts for
* protocol overhead, knet packet header and (if configured)
* crypto overhead,
* This function MUST NEVER block or add substantial delays.
*
* @return
* knet_handle_enable_pmtud_notify returns
* 0 on success
* -1 on error and errno is set.
*/
int knet_handle_enable_pmtud_notify(knet_handle_t knet_h,
void *pmtud_notify_fn_private_data,
void (*pmtud_notify_fn) (
void *private_data,
unsigned int data_mtu));
/**
* knet_handle_pmtud_get
*
* @brief Get the current data MTU
*
* knet_h - pointer to knet_handle_t
*
* data_mtu - pointer where to store data_mtu
*
* @return
* knet_handle_pmtud_get returns
* 0 on success
* -1 on error and errno is set.
*/
int knet_handle_pmtud_get(knet_handle_t knet_h,
unsigned int *data_mtu);
#define KNET_MIN_KEY_LEN 128
#define KNET_MAX_KEY_LEN 4096
struct knet_handle_crypto_cfg {
char crypto_model[16];
char crypto_cipher_type[16];
char crypto_hash_type[16];
unsigned char private_key[KNET_MAX_KEY_LEN];
unsigned int private_key_len;
};
/**
* knet_handle_crypto
*
* @brief set up packet cryptographic signing & encryption
*
* knet_h - pointer to knet_handle_t
*
* knet_handle_crypto_cfg -
* pointer to a knet_handle_crypto_cfg structure
*
* crypto_model should contain the model name.
* Currently only "openssl" and "nss" are supported.
* Setting to "none" will disable crypto.
*
* crypto_cipher_type
* should contain the cipher algo name.
* It can be set to "none" to disable
* encryption.
* Currently supported by "nss" model:
* "aes128", "aes192" and "aes256".
* "openssl" model supports more modes and it strictly
* depends on the openssl build. See: EVP_get_cipherbyname
* openssl API call for details.
*
* crypto_hash_type
* should contain the hashing algo name.
* It can be set to "none" to disable
* hashing.
* Currently supported by "nss" model:
* "md5", "sha1", "sha256", "sha384" and "sha512".
* "openssl" model supports more modes and it strictly
* depends on the openssl build. See: EVP_get_digestbyname
* openssl API call for details.
*
* private_key will contain the private shared key.
* It has to be at least KNET_MIN_KEY_LEN long.
*
* private_key_len
* length of the provided private_key.
*
* Implementation notes/current limitations:
* - enabling crypto, will increase latency as packets have
* to processed.
* - enabling crypto might reduce the overall throughtput
* due to crypto data overhead.
* - re-keying is not implemented yet.
* - private/public key encryption/hashing is not currently
* planned.
* - crypto key must be the same for all hosts in the same
* knet instance.
* - it is safe to call knet_handle_crypto multiple times at runtime.
* The last config will be used.
* IMPORTANT: a call to knet_handle_crypto can fail due to:
* 1) failure to obtain locking
* 2) errors to initializing the crypto level.
* This can happen even in subsequent calls to knet_handle_crypto.
* A failure in crypto init, might leave your traffic unencrypted!
* It's best to stop data forwarding (see knet_handle_setfwd(3)), change crypto config,
* start forward again.
*
* @return
* knet_handle_crypto returns:
* @retval 0 on success
* @retval -1 on error and errno is set.
* @retval -2 on crypto subsystem initialization error. No errno is provided at the moment (yet).
*/
int knet_handle_crypto(knet_handle_t knet_h,
struct knet_handle_crypto_cfg *knet_handle_crypto_cfg);
#define KNET_COMPRESS_THRESHOLD 100
struct knet_handle_compress_cfg {
char compress_model[16];
uint32_t compress_threshold;
int compress_level;
};
/**
* knet_handle_compress
*
* @brief Set up packet compression
*
* knet_h - pointer to knet_handle_t
*
* knet_handle_compress_cfg -
* pointer to a knet_handle_compress_cfg structure
*
* compress_model contains the model name.
* See "compress_level" for the list of accepted values.
* Setting the value to "none" disables compression.
*
* compress_threshold
* tells the transmission thread to NOT compress
* any packets that are smaller than the value
* indicated. Default 100 bytes.
* Set to 0 to reset to the default.
* Set to 1 to compress everything.
* Max accepted value is KNET_MAX_PACKET_SIZE.
*
* compress_level is the "level" parameter for most models:
* zlib: 0 (no compression), 1 (minimal) .. 9 (max compression).
* lz4: 1 (max compression)... 9 (fastest compression).
* lz4hc: 1 (min compression) ... LZ4HC_MAX_CLEVEL (16) or LZ4HC_CLEVEL_MAX (12)
* depending on the version of lz4hc libknet was built with.
* lzma: 0 (minimal) .. 9 (max compression)
* bzip2: 1 (minimal) .. 9 (max compression)
* For lzo2 it selects the algorithm to use:
* 1 : lzo1x_1_compress (default)
* 11 : lzo1x_1_11_compress
* 12 : lzo1x_1_12_compress
* 15 : lzo1x_1_15_compress
* 999: lzo1x_999_compress
* Other values select the default algorithm.
* Please refer to the documentation of the respective
* compression library for guidance about setting this
* value.
*
* Implementation notes:
* - it is possible to enable/disable compression at any time.
* - nodes can be using a different compression algorithm at any time.
* - knet does NOT implement the compression algorithm directly. it relies
* on external libraries for this functionality. Please read
* the libraries man pages to figure out which algorithm/compression
* level is best for the data you are planning to transmit.
*
* @return
* knet_handle_compress returns
* 0 on success
* -1 on error and errno is set. EINVAL means that either the model or the
* level are not supported.
*/
int knet_handle_compress(knet_handle_t knet_h,
struct knet_handle_compress_cfg *knet_handle_compress_cfg);
struct knet_handle_stats {
size_t size;
uint64_t tx_uncompressed_packets;
uint64_t tx_compressed_packets;
uint64_t tx_compressed_original_bytes;
uint64_t tx_compressed_size_bytes;
uint64_t tx_compress_time_ave;
uint64_t tx_compress_time_min;
uint64_t tx_compress_time_max;
uint64_t rx_compressed_packets;
uint64_t rx_compressed_original_bytes;
uint64_t rx_compressed_size_bytes;
uint64_t rx_compress_time_ave;
uint64_t rx_compress_time_min;
uint64_t rx_compress_time_max;
/* Overhead times, measured in usecs */
uint64_t tx_crypt_packets;
uint64_t tx_crypt_byte_overhead;
uint64_t tx_crypt_time_ave;
uint64_t tx_crypt_time_min;
uint64_t tx_crypt_time_max;
uint64_t rx_crypt_packets;
uint64_t rx_crypt_time_ave;
uint64_t rx_crypt_time_min;
uint64_t rx_crypt_time_max;
};
/**
* knet_handle_get_stats
*
* @brief Get statistics for compression & crypto
*
* knet_h - pointer to knet_handle_t
*
* knet_handle_stats
* pointer to a knet_handle_stats structure
*
* struct_size
* size of knet_handle_stats structure to allow
* for backwards compatibility. libknet will only
* copy this much data into the stats structure
* so that older callers will not get overflowed if
* new fields are added.
*
* @return
* 0 on success
* -1 on error and errno is set.
*
*/
int knet_handle_get_stats(knet_handle_t knet_h, struct knet_handle_stats *stats, size_t struct_size);
/*
* Tell knet_handle_clear_stats whether to clear just the handle stats
* or all of them.
*/
#define KNET_CLEARSTATS_HANDLE_ONLY 1
#define KNET_CLEARSTATS_HANDLE_AND_LINK 2
/**
* knet_handle_clear_stats
*
* @brief Clear knet stats, link and/or handle
*
* knet_h - pointer to knet_handle_t
*
* clear_option - Which stats to clear, must be one of
*
* KNET_CLEARSTATS_HANDLE_ONLY or
* KNET_CLEARSTATS_HANDLE_AND_LINK
*
* @return
* 0 on success
* -1 on error and errno is set.
*
*/
int knet_handle_clear_stats(knet_handle_t knet_h, int clear_option);
struct knet_crypto_info {
const char *name; /* openssl,nss,etc.. */
uint8_t properties; /* currently unused */
char pad[256]; /* currently unused */
};
/**
* knet_get_crypto_list
*
* @brief Get a list of supported crypto libraries
*
* crypto_list - array of struct knet_crypto_info *
* If NULL then only the number of structs is returned in crypto_list_entries
* to allow the caller to allocate sufficient space.
* libknet does not allow more than 256 crypto methods at the moment.
* it is safe to allocate 256 structs to avoid calling
* knet_get_crypto_list twice.
*
* crypto_list_entries - returns the number of structs in crypto_list
*
* @return
* knet_get_crypto_list returns
* 0 on success
* -1 on error and errno is set.
*/
int knet_get_crypto_list(struct knet_crypto_info *crypto_list,
size_t *crypto_list_entries);
struct knet_compress_info {
const char *name; /* bzip2, lz4, etc.. */
uint8_t properties; /* currently unused */
char pad[256]; /* currently unused */
};
/**
* knet_get_compress_list
*
* @brief Get a list of support compression types
*
* compress_list - array of struct knet_compress_info *
* If NULL then only the number of structs is returned in compress_list_entries
* to allow the caller to allocate sufficient space.
* libknet does not allow more than 256 compress methods at the moment.
* it is safe to allocate 256 structs to avoid calling
* knet_get_compress_list twice.
*
* compress_list_entries - returns the number of structs in compress_list
*
* @return
* knet_get_compress_list returns
* 0 on success
* -1 on error and errno is set.
*/
int knet_get_compress_list(struct knet_compress_info *compress_list,
size_t *compress_list_entries);
/*
* host structs/API calls
*/
/**
* knet_host_add
*
* @brief Add a new host ID to knet
*
* knet_h - pointer to knet_handle_t
*
* host_id - each host in a knet is identified with a unique ID
* (see also knet_handle_new(3))
*
* @return
* knet_host_add returns:
* 0 on success
* -1 on error and errno is set.
*/
int knet_host_add(knet_handle_t knet_h, knet_node_id_t host_id);
/**
* knet_host_remove
*
* @brief Remove a host ID from knet
*
* knet_h - pointer to knet_handle_t
*
* host_id - each host in a knet is identified with a unique ID
* (see also knet_handle_new(3))
*
* @return
* knet_host_remove returns:
* 0 on success
* -1 on error and errno is set.
*/
int knet_host_remove(knet_handle_t knet_h, knet_node_id_t host_id);
/**
* knet_host_set_name
*
* @brief Set the name of a knet host
*
* knet_h - pointer to knet_handle_t
*
* host_id - see knet_host_add(3)
*
* name - this name will be used for pretty logging and eventually
* search for hosts (see also knet_handle_host_get_name(2) and knet_handle_host_get_id(3)).
* Only up to KNET_MAX_HOST_LEN - 1 bytes will be accepted and
* name has to be unique for each host.
*
* @return
* knet_host_set_name returns:
* 0 on success
* -1 on error and errno is set.
*/
int knet_host_set_name(knet_handle_t knet_h, knet_node_id_t host_id,
const char *name);
/**
* knet_host_get_name_by_host_id
*
* @brief Get the name of a host given its ID
*
* knet_h - pointer to knet_handle_t
*
* host_id - see knet_host_add(3)
*
* name - pointer to a preallocated buffer of at least size KNET_MAX_HOST_LEN
* where the current host name will be stored
* (as set by knet_host_set_name or default by knet_host_add)
*
* @return
* knet_host_get_name_by_host_id returns:
* 0 on success
* -1 on error and errno is set (name is left untouched)
*/
int knet_host_get_name_by_host_id(knet_handle_t knet_h, knet_node_id_t host_id,
char *name);
/**
* knet_host_get_id_by_host_name
*
* @brief Get the ID of a host given its name
*
* knet_h - pointer to knet_handle_t
*
* name - name to lookup, max len KNET_MAX_HOST_LEN
*
* host_id - where to store the result
*
* @return
* knet_host_get_id_by_host_name returns:
* 0 on success
* -1 on error and errno is set.
*/
int knet_host_get_id_by_host_name(knet_handle_t knet_h, const char *name,
knet_node_id_t *host_id);
/**
* knet_host_get_host_list
*
* @brief Get a list of hosts known to knet
*
* knet_h - pointer to knet_handle_t
*
* host_ids - array of at lest KNET_MAX_HOST size
*
* host_ids_entries -
* number of entries writted in host_ids
*
* @return
* knet_host_get_host_list returns
* 0 on success
* -1 on error and errno is set.
*/
int knet_host_get_host_list(knet_handle_t knet_h,
knet_node_id_t *host_ids, size_t *host_ids_entries);
/*
* define switching policies
*/
#define KNET_LINK_POLICY_PASSIVE 0
#define KNET_LINK_POLICY_ACTIVE 1
#define KNET_LINK_POLICY_RR 2
/**
* knet_host_set_policy
*
* @brief Set the switching policy for a host's links
*
* knet_h - pointer to knet_handle_t
*
* host_id - see knet_host_add(3)
*
* policy - there are currently 3 kind of simple switching policies
* based on link configuration.
* KNET_LINK_POLICY_PASSIVE - the active link with the lowest
* priority will be used.
* if one or more active links share
* the same priority, the one with
* lowest link_id will be used.
*
* KNET_LINK_POLICY_ACTIVE - all active links will be used
* simultaneously to send traffic.
* link priority is ignored.
*
* KNET_LINK_POLICY_RR - round-robin policy, every packet
* will be send on a different active
* link.
*
* @return
* knet_host_set_policy returns
* 0 on success
* -1 on error and errno is set.
*/
int knet_host_set_policy(knet_handle_t knet_h, knet_node_id_t host_id,
uint8_t policy);
/**
* knet_host_get_policy
*
* @brief Get the switching policy for a host's links
*
* knet_h - pointer to knet_handle_t
*
* host_id - see knet_host_add(3)
*
* policy - will contain the current configured switching policy.
* Default is passive when creating a new host.
*
* @return
* knet_host_get_policy returns
* 0 on success
* -1 on error and errno is set.
*/
int knet_host_get_policy(knet_handle_t knet_h, knet_node_id_t host_id,
uint8_t *policy);
/**
* knet_host_enable_status_change_notify
*
* @brief Install a callback to get host status change events
*
* knet_h - pointer to knet_handle_t
*
* host_status_change_notify_fn_private_data -
* void pointer to data that can be used to identify
* the callback
*
* host_status_change_notify_fn -
* is a callback function that is invoked every time
* there is a change in the host status.
* host status is identified by:
* - reachable, this host can send/receive data to/from host_id
* - remote, 0 if the host_id is connected locally or 1 if
* the there is one or more knet host(s) in between.
* NOTE: re-switching is NOT currently implemented,
* but this is ready for future and can avoid
* an API/ABI breakage later on.
* - external, 0 if the host_id is configured locally or 1 if
* it has been added from remote nodes config.
* NOTE: dynamic topology is NOT currently implemented,
* but this is ready for future and can avoid
* an API/ABI breakage later on.
* This function MUST NEVER block or add substantial delays.
*
* @return
* knet_host_status_change_notify returns
* 0 on success
* -1 on error and errno is set.
*/
int knet_host_enable_status_change_notify(knet_handle_t knet_h,
void *host_status_change_notify_fn_private_data,
void (*host_status_change_notify_fn) (
void *private_data,
knet_node_id_t host_id,
uint8_t reachable,
uint8_t remote,
uint8_t external));
/*
* define host status structure for quick lookup
* struct is in flux as more stats will be added soon
*
* reachable host_id can be seen either directly connected
* or via another host_id
*
* remote 0 = node is connected locally, 1 is visible via
* via another host_id
*
* external 0 = node is configured/known locally,
* 1 host_id has been received via another host_id
*/
struct knet_host_status {
uint8_t reachable;
uint8_t remote;
uint8_t external;
/* add host statistics */
};
/**
* knet_host_get_status
*
* @brief Get the status of a host
*
* knet_h - pointer to knet_handle_t
*
* host_id - see knet_host_add(3)
*
* status - pointer to knet_host_status struct
*
* @return
* knet_handle_pmtud_get returns
* 0 on success
* -1 on error and errno is set.
*/
int knet_host_get_status(knet_handle_t knet_h, knet_node_id_t host_id,
struct knet_host_status *status);
/*
* link structs/API calls
*
* every host allocated/managed by knet_host_* has
* KNET_MAX_LINK structures to define the network
* paths that connect 2 hosts.
*
* Each link is identified by a link_id that has a
* values between 0 and KNET_MAX_LINK - 1.
*
* KNOWN LIMITATIONS:
*
* - let's assume the scenario where two hosts are connected
* with any number of links. link_id must match on both sides.
* If host_id 0 link_id 0 is configured to connect IP1 to IP2 and
* host_id 0 link_id 1 is configured to connect IP3 to IP4,
* host_id 1 link_id 0 _must_ connect IP2 to IP1 and likewise
* host_id 1 link_id 1 _must_ connect IP4 to IP3.
* We might be able to lift this restriction in future, by using
* other data to determine src/dst link_id, but for now, deal with it.
*/
/*
* commodity functions to convert strings to sockaddr and viceversa
*/
/**
* knet_strtoaddr
*
* @brief Convert a hostname string to an address
*
* host - IPaddr/hostname to convert
* be aware only the first IP address will be returned
* in case a hostname resolves to multiple IP
*
* port - port to connect to
*
* ss - sockaddr_storage where to store the converted data
*
* sslen - len of the sockaddr_storage
*
* @return
* knet_strtoaddr returns same error codes as getaddrinfo
*
*/
int knet_strtoaddr(const char *host, const char *port,
struct sockaddr_storage *ss, socklen_t sslen);
/**
* knet_addrtostr
*
* @brief Convert an address to a host name
*
* ss - sockaddr_storage to convert
*
* sslen - len of the sockaddr_storage
*
* host - IPaddr/hostname where to store data
* (recommended size: KNET_MAX_HOST_LEN)
*
* port - port buffer where to store data
* (recommended size: KNET_MAX_PORT_LEN)
*
* @return
* knet_strtoaddr returns same error codes as getnameinfo
*/
int knet_addrtostr(const struct sockaddr_storage *ss, socklen_t sslen,
char *addr_buf, size_t addr_buf_size,
char *port_buf, size_t port_buf_size);
#define KNET_TRANSPORT_LOOPBACK 0
#define KNET_TRANSPORT_UDP 1
#define KNET_TRANSPORT_SCTP 2
#define KNET_MAX_TRANSPORTS UINT8_MAX
/*
* The Loopback transport is only valid for connections to localhost, the host
* with the same node_id specified in knet_handle_new(). Only one link of this
* type is allowed. Data sent down a LOOPBACK link will be copied directly from
* the knet send datafd to the knet receive datafd so the application must be set
* up to take data from that socket at least as often as it is sent or deadlocks
* could occur. If used, a LOOPBACK link must be the only link configured to the
* local host.
*/
struct knet_transport_info {
const char *name; /* UDP/SCTP/etc... */
uint8_t id; /* value that can be used for link_set_config */
uint8_t properties; /* currently unused */
char pad[256]; /* currently unused */
};
/**
* knet_get_transport_list
*
* @brief Get a list of the transports support by this build of knet
*
* transport_list - an array of struct transport_info that must be
* at least of size struct transport_info * KNET_MAX_TRANSPORTS
*
* transport_list_entries - pointer to a size_t where to store how many transports
* are available in this build of libknet.
*
* @return
* knet_get_transport_list returns
* 0 on success
* -1 on error and errno is set.
*/
int knet_get_transport_list(struct knet_transport_info *transport_list,
size_t *transport_list_entries);
/**
* knet_get_transport_name_by_id
*
* @brief Get a transport name from its ID number
*
* transport - one of the KNET_TRANSPORT_xxx constants
*
* @return
* knet_get_transport_name_by_id returns:
*
* @retval pointer to the name on success or
* @retval NULL on error and errno is set.
*/
const char *knet_get_transport_name_by_id(uint8_t transport);
/**
* knet_get_transport_id_by_name
*
* @brief Get a transport ID from its name
*
* name - transport name (UDP/SCTP/etc)
*
* @return
* knet_get_transport_name_by_id returns:
*
* @retval KNET_MAX_TRANSPORTS on error and errno is set accordingly
* @retval KNET_TRANSPORT_xxx on success.
*/
uint8_t knet_get_transport_id_by_name(const char *name);
#define KNET_TRANSPORT_DEFAULT_RECONNECT_INTERVAL 1000
/**
* knet_handle_set_transport_reconnect_interval
*
* @brief Set the interval between transport attempts to reconnect a failed link
*
* knet_h - pointer to knet_handle_t
*
* msecs - milliseconds
*
* @return
* knet_handle_set_transport_reconnect_interval returns
* 0 on success
* -1 on error and errno is set.
*/
int knet_handle_set_transport_reconnect_interval(knet_handle_t knet_h, uint32_t msecs);
/**
* knet_handle_get_transport_reconnect_interval
*
* @brief Get the interval between transport attempts to reconnect a failed link
*
* knet_h - pointer to knet_handle_t
*
* msecs - milliseconds
*
* @return
* knet_handle_get_transport_reconnect_interval returns
* 0 on success
* -1 on error and errno is set.
*/
int knet_handle_get_transport_reconnect_interval(knet_handle_t knet_h, uint32_t *msecs);
/**
* knet_link_set_config
*
* @brief Configure the link to a host
*
* knet_h - pointer to knet_handle_t
*
* host_id - see knet_host_add(3)
*
* link_id - see knet_link_set_config(3)
*
* transport - one of the KNET_TRANSPORT_xxx constants
*
* src_addr - sockaddr_storage that can be either IPv4 or IPv6
*
* dst_addr - sockaddr_storage that can be either IPv4 or IPv6
* this can be null if we don't know the incoming
* IP address/port and the link will remain quiet
* till the node on the other end will initiate a
* connection
*
* flags - KNET_LINK_FLAG_*
*
* @return
* knet_link_set_config returns
* 0 on success
* -1 on error and errno is set.
*/
int knet_link_set_config(knet_handle_t knet_h, knet_node_id_t host_id, uint8_t link_id,
uint8_t transport,
struct sockaddr_storage *src_addr,
struct sockaddr_storage *dst_addr,
uint64_t flags);
/**
* knet_link_get_config
*
* @brief Get the link configutation information
*
* knet_h - pointer to knet_handle_t
*
* host_id - see knet_host_add(3)
*
* link_id - see knet_link_set_config(3)
*
* transport - see knet_link_set_config(3)
*
* src_addr - sockaddr_storage that can be either IPv4 or IPv6
*
* dst_addr - sockaddr_storage that can be either IPv4 or IPv6
*
* dynamic - 0 if dst_addr is static or 1 if dst_addr is dynamic.
* In case of 1, dst_addr can be NULL and it will be left
* untouched.
*
* flags - KNET_LINK_FLAG_*
*
* @return
* knet_link_get_config returns
* 0 on success.
* -1 on error and errno is set.
*/
int knet_link_get_config(knet_handle_t knet_h, knet_node_id_t host_id, uint8_t link_id,
uint8_t *transport,
struct sockaddr_storage *src_addr,
struct sockaddr_storage *dst_addr,
uint8_t *dynamic,
uint64_t *flags);
/**
* knet_link_clear_config
*
* @brief Clear link information and disconnect the link
*
* knet_h - pointer to knet_handle_t
*
* host_id - see knet_host_add(3)
*
* link_id - see knet_link_set_config(3)
*
* @return
* knet_link_clear_config returns
* 0 on success.
* -1 on error and errno is set.
*/
int knet_link_clear_config(knet_handle_t knet_h, knet_node_id_t host_id, uint8_t link_id);
/*
* Access lists management for open links
* see also knet_handle_enable_access_lists(3)
*/
-/*
+/**
+ * check_type_t
+ * @brief address type enum for knet access lists
+ *
* CHECK_TYPE_ADDRESS is the equivalent of a single entry / IP address.
* for example: 10.1.9.3
* and the entry is stored in ss1. ss2 can be NULL.
*
* CHECK_TYPE_MASK is used to configure network/netmask.
* for example: 192.168.0.0/24
* the network is stored in ss1 and the netmask in ss2.
*
* CHECK_TYPE_RANGE defines a value / range of ip addresses.
* for example: 172.16.0.1-172.16.0.10
* the start is stored in ss1 and the end in ss2.
*
* Please be aware that the above examples refer only to IP based protocols.
* Other protocols might use ss1 and ss2 in slightly different ways.
* At the moment knet only supports IP based protocol, though that might change
* in the future.
*/
typedef enum {
CHECK_TYPE_ADDRESS,
CHECK_TYPE_MASK,
CHECK_TYPE_RANGE
} check_type_t;
-/*
+/**
+ * check_acceptreject_t
+ * @brief enum for accept/reject in knet access lists
+ *
* accept or reject incoming packets defined in the access list entry
*/
typedef enum {
CHECK_ACCEPT,
CHECK_REJECT
} check_acceptreject_t;
/**
* knet_link_add_acl
*
* @brief Add access list entry to an open link
*
* knet_h - pointer to knet_handle_t
*
* host_id - see knet_host_add(3)
*
* link_id - see knet_link_set_config(3)
*
* ss1 / ss2 / type / acceptreject - see typedef definitions for details
*
* IMPORTANT: the order in which access lists are added is critical and it
* is left to the user to add them in the right order. knet
* will not attempt to logically sort them.
*
* For example:
* 1 - accept from 10.0.0.0/8
* 2 - reject from 10.0.0.1/32
*
* is not the same as:
*
* 1 - reject from 10.0.0.1/32
* 2 - accept from 10.0.0.0/8
*
* In the first example, rule number 2 will never match because
* packets from 10.0.0.1 will be accepted by rule number 1.
*
* @return
* knet_link_add_acl
* 0 on success.
* -1 on error and errno is set.
*/
int knet_link_add_acl(knet_handle_t knet_h, knet_node_id_t host_id, uint8_t link_id,
struct sockaddr_storage *ss1,
struct sockaddr_storage *ss2,
check_type_t type, check_acceptreject_t acceptreject);
/**
* knet_link_insert_acl
*
* @brief Insert access list entry to an open link at given index
*
* knet_h - pointer to knet_handle_t
*
* host_id - see knet_host_add(3)
*
* link_id - see knet_link_set_config(3)
*
* index - insert at position "index" where 0 is the first entry and -1
* appends to the current list.
*
* ss1 / ss2 / type / acceptreject - see typedef definitions for details
*
* @return
* knet_link_insert_acl
* 0 on success.
* -1 on error and errno is set.
*/
int knet_link_insert_acl(knet_handle_t knet_h, knet_node_id_t host_id, uint8_t link_id,
int index,
struct sockaddr_storage *ss1,
struct sockaddr_storage *ss2,
check_type_t type, check_acceptreject_t acceptreject);
/**
* knet_link_rm_acl
*
* @brief Remove access list entry from an open link
*
* knet_h - pointer to knet_handle_t
*
* host_id - see knet_host_add(3)
*
* link_id - see knet_link_set_config(3)
*
* ss1 / ss2 / type / acceptreject - see typedef definitions for details
*
* IMPORTANT: the data passed to this API call must match exactly that passed
* to knet_link_add_acl(3).
*
* @return
* knet_link_rm_acl
* 0 on success.
* -1 on error and errno is set.
*/
int knet_link_rm_acl(knet_handle_t knet_h, knet_node_id_t host_id, uint8_t link_id,
struct sockaddr_storage *ss1,
struct sockaddr_storage *ss2,
check_type_t type, check_acceptreject_t acceptreject);
/**
* knet_link_clear_acl
*
* @brief Remove all access list entries from an open link
*
* knet_h - pointer to knet_handle_t
*
* host_id - see knet_host_add(3)
*
* link_id - see knet_link_set_config(3)
*
* @return
* knet_link_clear_acl
* 0 on success.
* -1 on error and errno is set.
*/
int knet_link_clear_acl(knet_handle_t knet_h, knet_node_id_t host_id, uint8_t link_id);
/**
* knet_link_set_enable
*
* @brief Enable traffic on a link
*
* knet_h - pointer to knet_handle_t
*
* host_id - see knet_host_add(3)
*
* link_id - see knet_link_set_config(3)
*
* enabled - 0 disable the link, 1 enable the link
*
* @return
* knet_link_set_enable returns
* 0 on success
* -1 on error and errno is set.
*/
int knet_link_set_enable(knet_handle_t knet_h, knet_node_id_t host_id, uint8_t link_id,
unsigned int enabled);
/**
* knet_link_get_enable
*
* @brief Find out whether a link is enabled or not
*
* knet_h - pointer to knet_handle_t
*
* host_id - see knet_host_add(3)
*
* link_id - see knet_link_set_config(3)
*
* enabled - 0 disable the link, 1 enable the link
*
* @return
* knet_link_get_enable returns
* 0 on success
* -1 on error and errno is set.
*/
int knet_link_get_enable(knet_handle_t knet_h, knet_node_id_t host_id, uint8_t link_id,
unsigned int *enabled);
#define KNET_LINK_DEFAULT_PING_INTERVAL 1000 /* 1 second */
#define KNET_LINK_DEFAULT_PING_TIMEOUT 2000 /* 2 seconds */
#define KNET_LINK_DEFAULT_PING_PRECISION 2048 /* samples */
/**
* knet_link_set_ping_timers
*
* @brief Set the ping timers for a link
*
* knet_h - pointer to knet_handle_t
*
* host_id - see knet_host_add(3)
*
* link_id - see knet_link_set_config(3)
*
* interval - specify the ping interval in milliseconds.
*
* timeout - if no pong is received within this time,
* the link is declared dead, in milliseconds.
* NOTE: in future it will be possible to set timeout to 0
* for an autocalculated timeout based on interval, pong_count
* and latency. The API already accept 0 as value and it will
* return ENOSYS / -1. Once the automatic calculation feature
* will be implemented, this call will only return EINVAL
* for incorrect values.
*
* precision - how many values of latency are used to calculate
* the average link latency (see also knet_link_get_status(3))
*
* @return
* knet_link_set_ping_timers returns
* 0 on success
* -1 on error and errno is set.
*/
int knet_link_set_ping_timers(knet_handle_t knet_h, knet_node_id_t host_id, uint8_t link_id,
time_t interval, time_t timeout, unsigned int precision);
/**
* knet_link_get_ping_timers
*
* @brief Get the ping timers for a link
*
* knet_h - pointer to knet_handle_t
*
* host_id - see knet_host_add(3)
*
* link_id - see knet_link_set_config(3)
*
* interval - ping interval
*
* timeout - if no pong is received within this time,
* the link is declared dead
*
* precision - how many values of latency are used to calculate
* the average link latency (see also knet_link_get_status(3))
*
* @return
* knet_link_get_ping_timers returns
* 0 on success
* -1 on error and errno is set.
*/
int knet_link_get_ping_timers(knet_handle_t knet_h, knet_node_id_t host_id, uint8_t link_id,
time_t *interval, time_t *timeout, unsigned int *precision);
#define KNET_LINK_DEFAULT_PONG_COUNT 5
/**
* knet_link_set_pong_count
*
* @brief Set the pong count for a link
*
* knet_h - pointer to knet_handle_t
*
* host_id - see knet_host_add(3)
*
* link_id - see knet_link_set_config(3)
*
* pong_count - how many valid ping/pongs before a link is marked UP.
* default: 5, value should be > 0
*
* @return
* knet_link_set_pong_count returns
* 0 on success
* -1 on error and errno is set.
*/
int knet_link_set_pong_count(knet_handle_t knet_h, knet_node_id_t host_id, uint8_t link_id,
uint8_t pong_count);
/**
* knet_link_get_pong_count
*
* @brief Get the pong count for a link
*
* knet_h - pointer to knet_handle_t
*
* host_id - see knet_host_add(3)
*
* link_id - see knet_link_set_config(3)
*
* pong_count - how many valid ping/pongs before a link is marked UP.
* default: 5, value should be > 0
*
* @return
* knet_link_get_pong_count returns
* 0 on success
* -1 on error and errno is set.
*/
int knet_link_get_pong_count(knet_handle_t knet_h, knet_node_id_t host_id, uint8_t link_id,
uint8_t *pong_count);
/**
* knet_link_set_priority
*
* @brief Set the priority for a link
*
* knet_h - pointer to knet_handle_t
*
* host_id - see knet_host_add(3)
*
* link_id - see knet_link_set_config(3)
*
* priority - specify the switching priority for this link
* see also knet_host_set_policy
*
* @return
* knet_link_set_priority returns
* 0 on success
* -1 on error and errno is set.
*/
int knet_link_set_priority(knet_handle_t knet_h, knet_node_id_t host_id, uint8_t link_id,
uint8_t priority);
/**
* knet_link_get_priority
*
* @brief Get the priority for a link
*
* knet_h - pointer to knet_handle_t
*
* host_id - see knet_host_add(3)
*
* link_id - see knet_link_set_config(3)
*
* priority - gather the switching priority for this link
* see also knet_host_set_policy
*
* @return
* knet_link_get_priority returns
* 0 on success
* -1 on error and errno is set.
*/
int knet_link_get_priority(knet_handle_t knet_h, knet_node_id_t host_id, uint8_t link_id,
uint8_t *priority);
/**
* knet_link_get_link_list
*
* @brief Get a list of links connecting a host
*
* knet_h - pointer to knet_handle_t
*
* link_ids - array of at lest KNET_MAX_LINK size
* with the list of configured links for a certain host.
*
* link_ids_entries -
* number of entries contained in link_ids
*
* @return
* knet_link_get_link_list returns
* 0 on success
* -1 on error and errno is set.
*/
int knet_link_get_link_list(knet_handle_t knet_h, knet_node_id_t host_id,
uint8_t *link_ids, size_t *link_ids_entries);
/*
* define link status structure for quick lookup
*
* src/dst_{ipaddr,port} strings are filled by
* getnameinfo(3) when configuring the link.
* if the link is dynamic (see knet_link_set_config(3))
* dst_ipaddr/port will contain ipaddr/port of the currently
* connected peer or "Unknown" if it was not possible
* to determine the ipaddr/port at runtime.
*
* enabled see also knet_link_set/get_enable.
*
* connected the link is connected to a peer and ping/pong traffic
* is flowing.
*
* dynconnected the link has dynamic ip on the other end, and
* we can see the other host is sending pings to us.
*
* latency average latency of this link
* see also knet_link_set/get_timeout.
*
* pong_last if the link is down, this value tells us how long
* ago this link was active. A value of 0 means that the link
* has never been active.
*
* knet_link_stats structure that contains details statistics for the link
*/
#define MAX_LINK_EVENTS 16
struct knet_link_stats {
/* onwire values */
uint64_t tx_data_packets;
uint64_t rx_data_packets;
uint64_t tx_data_bytes;
uint64_t rx_data_bytes;
uint64_t rx_ping_packets;
uint64_t tx_ping_packets;
uint64_t rx_ping_bytes;
uint64_t tx_ping_bytes;
uint64_t rx_pong_packets;
uint64_t tx_pong_packets;
uint64_t rx_pong_bytes;
uint64_t tx_pong_bytes;
uint64_t rx_pmtu_packets;
uint64_t tx_pmtu_packets;
uint64_t rx_pmtu_bytes;
uint64_t tx_pmtu_bytes;
/* Only filled in when requested */
uint64_t tx_total_packets;
uint64_t rx_total_packets;
uint64_t tx_total_bytes;
uint64_t rx_total_bytes;
uint64_t tx_total_errors;
uint64_t tx_total_retries;
uint32_t tx_pmtu_errors;
uint32_t tx_pmtu_retries;
uint32_t tx_ping_errors;
uint32_t tx_ping_retries;
uint32_t tx_pong_errors;
uint32_t tx_pong_retries;
uint32_t tx_data_errors;
uint32_t tx_data_retries;
/* measured in usecs */
uint32_t latency_min;
uint32_t latency_max;
uint32_t latency_ave;
uint32_t latency_samples;
/* how many times the link has been going up/down */
uint32_t down_count;
uint32_t up_count;
/*
* circular buffer of time_t structs collecting the history
* of up/down events on this link.
* the index indicates current/last event.
* it is safe to walk back the history by decreasing the index
*/
time_t last_up_times[MAX_LINK_EVENTS];
time_t last_down_times[MAX_LINK_EVENTS];
int8_t last_up_time_index;
int8_t last_down_time_index;
/* Always add new stats at the end */
};
struct knet_link_status {
size_t size; /* For ABI checking */
char src_ipaddr[KNET_MAX_HOST_LEN];
char src_port[KNET_MAX_PORT_LEN];
char dst_ipaddr[KNET_MAX_HOST_LEN];
char dst_port[KNET_MAX_PORT_LEN];
uint8_t enabled; /* link is configured and admin enabled for traffic */
uint8_t connected; /* link is connected for data (local view) */
uint8_t dynconnected; /* link has been activated by remote dynip */
unsigned long long latency; /* average latency computed by fix/exp */
struct timespec pong_last;
unsigned int mtu; /* current detected MTU on this link */
unsigned int proto_overhead; /* contains the size of the IP protocol, knet headers and
* crypto headers (if configured). This value is filled in
* ONLY after the first PMTUd run on that given link,
* and can change if link configuration or crypto configuration
* changes at runtime.
* WARNING: in general mtu + proto_overhead might or might
* not match the output of ifconfig mtu due to crypto
* requirements to pad packets to some specific boundaries. */
/* Link statistics */
struct knet_link_stats stats;
};
/**
* knet_link_get_status
*
* @brief Get the status (and statistics) for a link
*
* knet_h - pointer to knet_handle_t
*
* host_id - see knet_host_add(3)
*
* link_id - see knet_link_set_config(3)
*
* status - pointer to knet_link_status struct
*
* struct_size - max size of knet_link_status - allows library to
* add fields without ABI change. Returned structure
* will be truncated to this length and .size member
* indicates the full size.
*
* @return
* knet_link_get_status returns
* 0 on success
* -1 on error and errno is set.
*/
int knet_link_get_status(knet_handle_t knet_h, knet_node_id_t host_id, uint8_t link_id,
struct knet_link_status *status, size_t struct_size);
/*
* logging structs/API calls
*/
/*
* libknet is composed of several subsystems. In order
* to easily distinguish log messages coming from different
* places, each subsystem has its own ID.
*
* 0-19 config/management
* 20-39 internal threads
* 40-59 transports
* 60-69 crypto implementations
*/
#define KNET_SUB_COMMON 0 /* common.c */
#define KNET_SUB_HANDLE 1 /* handle.c alloc/dealloc config changes */
#define KNET_SUB_HOST 2 /* host add/del/modify */
#define KNET_SUB_LISTENER 3 /* listeners add/del/modify... */
#define KNET_SUB_LINK 4 /* link add/del/modify */
#define KNET_SUB_TRANSPORT 5 /* Transport common */
#define KNET_SUB_CRYPTO 6 /* crypto.c config generic layer */
#define KNET_SUB_COMPRESS 7 /* compress.c config generic layer */
#define KNET_SUB_FILTER 19 /* allocated for users to log from dst_filter */
#define KNET_SUB_DSTCACHE 20 /* switching thread (destination cache handling) */
#define KNET_SUB_HEARTBEAT 21 /* heartbeat thread */
#define KNET_SUB_PMTUD 22 /* Path MTU Discovery thread */
#define KNET_SUB_TX 23 /* send to link thread */
#define KNET_SUB_RX 24 /* recv from link thread */
#define KNET_SUB_TRANSP_BASE 40 /* Base log level for transports */
#define KNET_SUB_TRANSP_LOOPBACK (KNET_SUB_TRANSP_BASE + KNET_TRANSPORT_LOOPBACK)
#define KNET_SUB_TRANSP_UDP (KNET_SUB_TRANSP_BASE + KNET_TRANSPORT_UDP)
#define KNET_SUB_TRANSP_SCTP (KNET_SUB_TRANSP_BASE + KNET_TRANSPORT_SCTP)
#define KNET_SUB_NSSCRYPTO 60 /* nsscrypto.c */
#define KNET_SUB_OPENSSLCRYPTO 61 /* opensslcrypto.c */
#define KNET_SUB_ZLIBCOMP 70 /* compress_zlib.c */
#define KNET_SUB_LZ4COMP 71 /* compress_lz4.c */
#define KNET_SUB_LZ4HCCOMP 72 /* compress_lz4.c */
#define KNET_SUB_LZO2COMP 73 /* compress_lzo.c */
#define KNET_SUB_LZMACOMP 74 /* compress_lzma.c */
#define KNET_SUB_BZIP2COMP 75 /* compress_bzip2.c */
#define KNET_SUB_UNKNOWN UINT8_MAX - 1
#define KNET_MAX_SUBSYSTEMS UINT8_MAX
/*
* Convert between subsystem IDs and names
*/
/**
* knet_log_get_subsystem_name
*
* @brief Get a logging system name from its numeric ID
*
* @return
* returns internal name of the subsystem or "common"
*/
const char *knet_log_get_subsystem_name(uint8_t subsystem);
/**
* knet_log_get_subsystem_id
*
* @brief Get a logging system ID from its name
*
* @return
* returns internal ID of the subsystem or KNET_SUB_COMMON
*/
uint8_t knet_log_get_subsystem_id(const char *name);
/*
* 4 log levels are enough for everybody
*/
#define KNET_LOG_ERR 0 /* unrecoverable errors/conditions */
#define KNET_LOG_WARN 1 /* recoverable errors/conditions */
#define KNET_LOG_INFO 2 /* info, link up/down, config changes.. */
#define KNET_LOG_DEBUG 3
/*
* Convert between log level values and names
*/
/**
* knet_log_get_loglevel_name
*
* @brief Get a logging level name from its numeric ID
*
* @return
* returns internal name of the log level or "ERROR" for unknown values
*/
const char *knet_log_get_loglevel_name(uint8_t level);
/**
* knet_log_get_loglevel_id
*
* @brief Get a logging level ID from its name
*
* @return
* returns internal log level ID or KNET_LOG_ERR for invalid names
*/
uint8_t knet_log_get_loglevel_id(const char *name);
/*
* every log message is composed by a text message
* and message level/subsystem IDs.
* In order to make debugging easier it is possible to send those packets
* straight to stdout/stderr (see knet_bench.c stdout option).
*/
#define KNET_MAX_LOG_MSG_SIZE 254
#if KNET_MAX_LOG_MSG_SIZE > PIPE_BUF
#error KNET_MAX_LOG_MSG_SIZE cannot be bigger than PIPE_BUF for guaranteed system atomic writes
#endif
struct knet_log_msg {
char msg[KNET_MAX_LOG_MSG_SIZE];
uint8_t subsystem; /* KNET_SUB_* */
uint8_t msglevel; /* KNET_LOG_* */
};
/**
* knet_log_set_loglevel
*
* @brief Set the logging level for a subsystem
*
* knet_h - same as above
*
* subsystem - same as above
*
* level - same as above
*
* knet_log_set_loglevel allows fine control of log levels by subsystem.
* See also knet_handle_new for defaults.
*
* @return
* knet_log_set_loglevel returns
* 0 on success
* -1 on error and errno is set.
*/
int knet_log_set_loglevel(knet_handle_t knet_h, uint8_t subsystem,
uint8_t level);
/**
* knet_log_get_loglevel
*
* @brief Get the logging level for a subsystem
*
* knet_h - same as above
*
* subsystem - same as above
*
* level - same as above
*
* @return
* knet_log_get_loglevel returns
* 0 on success
* -1 on error and errno is set.
*/
int knet_log_get_loglevel(knet_handle_t knet_h, uint8_t subsystem,
uint8_t *level);
#endif