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/*
* test/test-complex-HTB-with-hash-filters.c Add HTB qdisc, HTB classes and creates some hash filters
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation version 2.1
* of the License.
*
* Copyright (c) 2011 Adrian Ban <adrian.ban@mantech.ro>
*/
#include <netlink/route/link.h>
#include <netlink/route/tc.h>
#include <netlink/route/qdisc.h>
#include <netlink/route/qdisc/htb.h>
#include <netlink/route/qdisc/sfq.h>
#include <netlink/route/cls/u32.h>
#include <netlink/route/classifier.h>
#include <netlink/route/class.h>
#include <linux/if_ether.h>
#include <netlink/attr.h>
//#include "include/rtnl_u32.h"
#include <stdio.h>
#include <string.h>
//#include "include/rtnl_u32_addon.h"
#define TC_HANDLE(maj, min) (TC_H_MAJ((maj) << 16) | TC_H_MIN(min))
/* some functions are copied from iproute-tc tool */
int get_u32(__u32 *val, const char *arg, int base)
{
unsigned long res;
char *ptr;
if (!arg || !*arg)
return -1;
res = strtoul(arg, &ptr, base);
if (!ptr || ptr == arg || *ptr || res > 0xFFFFFFFFUL)
return -1;
*val = res;
return 0;
}
int get_u32_handle(__u32 *handle, const char *str)
{
__u32 htid=0, hash=0, nodeid=0;
char *tmp = strchr(str, ':');
if (tmp == NULL) {
if (memcmp("0x", str, 2) == 0)
return get_u32(handle, str, 16);
return -1;
}
htid = strtoul(str, &tmp, 16);
if (tmp == str && *str != ':' && *str != 0)
return -1;
if (htid>=0x1000)
return -1;
if (*tmp) {
str = tmp+1;
hash = strtoul(str, &tmp, 16);
if (tmp == str && *str != ':' && *str != 0)
return -1;
if (hash>=0x100)
return -1;
if (*tmp) {
str = tmp+1;
nodeid = strtoul(str, &tmp, 16);
if (tmp == str && *str != 0)
return -1;
if (nodeid>=0x1000)
return -1;
}
}
*handle = (htid<<20)|(hash<<12)|nodeid;
return 0;
}
uint32_t get_u32_parse_handle(const char *cHandle)
{
uint32_t handle=0;
if(get_u32_handle(&handle, cHandle)) {
printf ("Illegal \"ht\"\n");
return -1;
}
if (handle && TC_U32_NODE(handle)) {
printf("\"link\" must be a hash table.\n");
return -1;
}
return handle;
}
int get_tc_classid(__u32 *h, const char *str)
{
__u32 maj, min;
char *p;
maj = TC_H_ROOT;
if (strcmp(str, "root") == 0)
goto ok;
maj = TC_H_UNSPEC;
if (strcmp(str, "none") == 0)
goto ok;
maj = strtoul(str, &p, 16);
if (p == str) {
maj = 0;
if (*p != ':')
return -1;
}
if (*p == ':') {
if (maj >= (1<<16))
return -1;
maj <<= 16;
str = p+1;
min = strtoul(str, &p, 16);
if (*p != 0)
return -1;
if (min >= (1<<16))
return -1;
maj |= min;
} else if (*p != 0)
return -1;
ok:
*h = maj;
return 0;
}
/*
* Function that adds a new filter and attach it to a hash table
*
*/
int u32_add_filter_on_ht(struct nl_sock *sock, struct rtnl_link *rtnlLink, uint32_t prio,
uint32_t keyval, uint32_t keymask, int keyoff, int keyoffmask,
uint32_t htid, uint32_t classid
)
{
struct rtnl_cls *cls;
int err;
//printf("Key Val : 0x%x\n", keyval);
//printf("Key Mask : 0x%x\n", keymask);
cls=rtnl_cls_alloc();
if (!(cls)) {
printf("Can not allocate classifier\n");
nl_socket_free(sock);
exit(1);
}
rtnl_tc_set_link(TC_CAST(cls), rtnlLink);
if ((err = rtnl_tc_set_kind(TC_CAST(cls), "u32"))) {
printf("Can not set classifier as u32\n");
return 1;
}
rtnl_cls_set_prio(cls, prio);
rtnl_cls_set_protocol(cls, ETH_P_IP);
rtnl_tc_set_parent(TC_CAST(cls), TC_HANDLE(1, 0));
rtnl_u32_set_hashtable(cls, htid);
rtnl_u32_add_key_uint32(cls, keyval, keymask, keyoff, keyoffmask); /* 10.0.0.0/8 */
rtnl_u32_set_classid(cls, classid);
rtnl_u32_set_cls_terminal(cls);
if ((err = rtnl_cls_add(sock, cls, NLM_F_CREATE))) {
printf("Can not add classifier: %s\n", nl_geterror(err));
return -1;
}
rtnl_cls_put(cls);
return 0;
}
/*
* Function that adds a new filter and attach it to a hash table
* and set next hash table link with hash mask
*
*/
int u32_add_filter_on_ht_with_hashmask(struct nl_sock *sock, struct rtnl_link *rtnlLink, uint32_t prio,
uint32_t keyval, uint32_t keymask, int keyoff, int keyoffmask,
uint32_t htid, uint32_t htlink, uint32_t hmask, uint32_t hoffset
)
{
struct rtnl_cls *cls;
int err;
//printf("Key Val : 0x%x\n", keyval);
//printf("Key Mask : 0x%x\n", keymask);
cls=rtnl_cls_alloc();
if (!(cls)) {
printf("Can not allocate classifier\n");
nl_socket_free(sock);
exit(1);
}
rtnl_tc_set_link(TC_CAST(cls), rtnlLink);
if ((err = rtnl_tc_set_kind(TC_CAST(cls), "u32"))) {
printf("Can not set classifier as u32\n");
return 1;
}
rtnl_cls_set_prio(cls, prio);
rtnl_cls_set_protocol(cls, ETH_P_IP);
rtnl_tc_set_parent(TC_CAST(cls), TC_HANDLE(1, 0));
if (htid)
rtnl_u32_set_hashtable(cls, htid);
rtnl_u32_add_key_uint32(cls, keyval, keymask, keyoff, keyoffmask);
rtnl_u32_set_hashmask(cls, hmask, hoffset);
rtnl_u32_set_link(cls, htlink);
if ((err = rtnl_cls_add(sock, cls, NLM_F_CREATE))) {
printf("Can not add classifier: %s\n", nl_geterror(err));
return -1;
}
rtnl_cls_put(cls);
return 0;
}
/*
* function that creates a new hash table
*/
int u32_add_ht(struct nl_sock *sock, struct rtnl_link *rtnlLink, uint32_t prio, uint32_t htid, uint32_t divisor)
{
int err;
struct rtnl_cls *cls;
cls=rtnl_cls_alloc();
if (!(cls)) {
printf("Can not allocate classifier\n");
nl_socket_free(sock);
exit(1);
}
rtnl_tc_set_link(TC_CAST(cls), rtnlLink);
if ((err = rtnl_tc_set_kind(TC_CAST(cls), "u32"))) {
printf("Can not set classifier as u32\n");
return 1;
}
rtnl_cls_set_prio(cls, prio);
rtnl_cls_set_protocol(cls, ETH_P_IP);
rtnl_tc_set_parent(TC_CAST(cls), TC_HANDLE(1, 0));
rtnl_u32_set_handle(cls, htid, 0x0, 0x0);
//printf("htid: 0x%X\n", htid);
rtnl_u32_set_divisor(cls, divisor);
if ((err = rtnl_cls_add(sock, cls, NLM_F_CREATE))) {
printf("Can not add classifier: %s\n", nl_geterror(err));
return -1;
}
rtnl_cls_put(cls);
return 0;
}
/*
* function that adds a new HTB qdisc and set the default class for unclassified traffic
*/
int qdisc_add_HTB(struct nl_sock *sock, struct rtnl_link *rtnlLink, uint32_t defaultClass)
{
struct rtnl_qdisc *qdisc;
int err;
/* Allocation of a qdisc object */
if (!(qdisc = rtnl_qdisc_alloc())) {
printf("Can not allocate Qdisc\n");
return -1;
}
//rtnl_tc_set_ifindex(TC_CAST(qdisc), master_index);
rtnl_tc_set_link(TC_CAST(qdisc), rtnlLink);
rtnl_tc_set_parent(TC_CAST(qdisc), TC_H_ROOT);
//delete the qdisc
//printf("Delete current qdisc\n");
rtnl_qdisc_delete(sock, qdisc);
//rtnl_qdisc_put(qdisc);
//add a HTB qdisc
//printf("Add a new HTB qdisc\n");
rtnl_tc_set_handle(TC_CAST(qdisc), TC_HANDLE(1,0));
if ((err = rtnl_tc_set_kind(TC_CAST(qdisc), "htb"))) {
printf("Can not allocate HTB\n");
return -1;
}
/* Set default class for unclassified traffic */
//printf("Set default class for unclassified traffic\n");
rtnl_htb_set_defcls(qdisc, TC_HANDLE(1, defaultClass));
rtnl_htb_set_rate2quantum(qdisc, 1);
/* Submit request to kernel and wait for response */
if ((err = rtnl_qdisc_add(sock, qdisc, NLM_F_CREATE))) {
printf("Can not allocate HTB Qdisc\n");
return -1;
}
/* Return the qdisc object to free memory resources */
rtnl_qdisc_put(qdisc);
return 0;
}
/*
* function that adds a new HTB class and set its parameters
*/
int class_add_HTB(struct nl_sock *sock, struct rtnl_link *rtnlLink,
uint32_t parentMaj, uint32_t parentMin,
uint32_t childMaj, uint32_t childMin,
uint64_t rate, uint64_t ceil,
uint32_t burst, uint32_t cburst,
uint32_t prio
)
{
int err;
struct rtnl_class *class;
//struct rtnl_class *class = (struct rtnl_class *) tc;
//create a HTB class
//class = (struct rtnl_class *)rtnl_class_alloc();
if (!(class = rtnl_class_alloc())) {
printf("Can not allocate class object\n");
return 1;
}
//
rtnl_tc_set_link(TC_CAST(class), rtnlLink);
//add a HTB qdisc
//printf("Add a new HTB class with 0x%X:0x%X on parent 0x%X:0x%X\n", childMaj, childMin, parentMaj, parentMin);
rtnl_tc_set_parent(TC_CAST(class), TC_HANDLE(parentMaj, parentMin));
rtnl_tc_set_handle(TC_CAST(class), TC_HANDLE(childMaj, childMin));
if ((err = rtnl_tc_set_kind(TC_CAST(class), "htb"))) {
printf("Can not set HTB to class\n");
return 1;
}
//printf("set HTB class prio to %u\n", prio);
rtnl_htb_set_prio((struct rtnl_class *)class, prio);
if (rate) {
//rate=rate/8;
rtnl_htb_set_rate(class, rate);
}
if (ceil) {
//ceil=ceil/8;
rtnl_htb_set_ceil(class, ceil);
}
if (burst) {
//printf ("Class HTB: set rate burst: %u\n", burst);
rtnl_htb_set_rbuffer(class, burst);
}
if (cburst) {
//printf ("Class HTB: set rate cburst: %u\n", cburst);
rtnl_htb_set_cbuffer(class, cburst);
}
/* Submit request to kernel and wait for response */
if ((err = rtnl_class_add(sock, class, NLM_F_CREATE))) {
printf("Can not allocate HTB Qdisc\n");
return 1;
}
rtnl_class_put(class);
return 0;
}
/*
* function that adds a HTB root class and set its parameters
*/
int class_add_HTB_root(struct nl_sock *sock, struct rtnl_link *rtnlLink,
uint64_t rate, uint64_t ceil,
uint32_t burst, uint32_t cburst
)
{
int err;
struct rtnl_class *class;
//create a HTB class
class = (struct rtnl_class *)rtnl_class_alloc();
//class = rtnl_class_alloc();
if (!class) {
printf("Can not allocate class object\n");
return 1;
}
//
rtnl_tc_set_link(TC_CAST(class), rtnlLink);
rtnl_tc_set_parent(TC_CAST(class), TC_H_ROOT);
//add a HTB class
//printf("Add a new HTB ROOT class\n");
rtnl_tc_set_handle(TC_CAST(class), 1);
if ((err = rtnl_tc_set_kind(TC_CAST(class), "htb"))) {
printf("Can not set HTB to class\n");
return 1;
}
if (rate) {
//rate=rate/8;
rtnl_htb_set_rate(class, rate);
}
if (ceil) {
//ceil=ceil/8;
rtnl_htb_set_ceil(class, ceil);
}
if (burst) {
rtnl_htb_set_rbuffer(class, burst);
}
if (cburst) {
rtnl_htb_set_cbuffer(class, cburst);
}
/* Submit request to kernel and wait for response */
if ((err = rtnl_class_add(sock, class, NLM_F_CREATE))) {
printf("Can not allocate HTB Qdisc\n");
return 1;
}
rtnl_class_put(class);
return 0;
}
/*
* function that adds a new SFQ qdisc as a leaf for a HTB class
*/
int qdisc_add_SFQ_leaf(struct nl_sock *sock, struct rtnl_link *rtnlLink,
uint32_t parentMaj, uint32_t parentMin,
int quantum, int limit, int perturb
)
{
int err;
struct rtnl_qdisc *qdisc;
if (!(qdisc = rtnl_qdisc_alloc())) {
printf("Can not allocate qdisc object\n");
return 1;
}
rtnl_tc_set_link(TC_CAST(qdisc), rtnlLink);
rtnl_tc_set_parent(TC_CAST(qdisc), TC_HANDLE(parentMaj, parentMin));
rtnl_tc_set_handle(TC_CAST(qdisc), TC_HANDLE(parentMin,0));
if ((err = rtnl_tc_set_kind(TC_CAST(qdisc), "sfq"))) {
printf("Can not set SQF class\n");
return 1;
}
if(quantum) {
rtnl_sfq_set_quantum(qdisc, quantum);
} else {
rtnl_sfq_set_quantum(qdisc, 16000); // tc default value
}
if(limit) {
rtnl_sfq_set_limit(qdisc, limit); // default is 127
}
if(perturb) {
rtnl_sfq_set_perturb(qdisc, perturb); // default never perturb the hash
}
/* Submit request to kernel and wait for response */
if ((err = rtnl_qdisc_add(sock, qdisc, NLM_F_CREATE))) {
printf("Can not allocate SFQ qdisc\n");
return -1;
}
/* Return the qdisc object to free memory resources */
rtnl_qdisc_put(qdisc);
return 0;
}
int main() {
struct nl_sock *sock;
struct rtnl_link *link;
//struct rtnl_qdisc *qdisc;
//struct rtnl_class *class;
//struct rtnl_cls *cls;
uint32_t ht, htlink, htid, direction, classid;
//uint32_t hash, hashmask, nodeid, divisor, handle;
//struct rtnl_u32 *f_u32;
char chashlink[16]="";
//uint64_t drops, qlen;
//int master_index;
int err;
//uint64_t rate=0, ceil=0;
struct nl_cache *link_cache;
if (!(sock = nl_socket_alloc())) {
printf("Unable to allocate netlink socket\n");
exit(1);
}
if ((err = nl_connect(sock, NETLINK_ROUTE)) < 0 ) {
printf("Nu s-a putut conecta la NETLINK!\n");
nl_socket_free(sock);
exit(1);
}
if ((err = rtnl_link_alloc_cache(sock, AF_UNSPEC, &link_cache)) < 0) {
printf("Unable to allocate link cache: %s\n",
nl_geterror(err));
nl_socket_free(sock);
exit(1);
}
/* lookup interface index of eth0 */
if (!(link = rtnl_link_get_by_name(link_cache, "imq0"))) {
/* error */
printf("Interface not found\n");
nl_socket_free(sock);
exit(1);
}
err=qdisc_add_HTB(sock, link, 0xffff);
//drops = rtnl_tc_get_stat(TC_CAST(qdisc), RTNL_TC_DROPS);
//printf("Add ROOT HTB class\n");
err=class_add_HTB_root(sock, link, 12500000, 12500000, 25000, 25000);
err=class_add_HTB(sock, link, 1, 0, 1, 0xffff, 1250000, 12500000, 25000, 25000, 5);
err=qdisc_add_SFQ_leaf(sock, link, 1, 0xffff, 16000, 0, 10);
err=class_add_HTB(sock, link, 1, 1, 1, 0x5, 2000000, 2000000, 25000, 25000, 5);
err=qdisc_add_SFQ_leaf(sock, link, 1, 0x5, 16000, 0, 10);
err=class_add_HTB(sock, link, 1, 1, 1, 0x6, 1000000, 1000000, 25000, 25000, 5);
err=qdisc_add_SFQ_leaf(sock, link, 1, 0x6, 16000, 0, 10);
//err=class_add_HTB(sock, link, 1, 0, 1, 0x7, 1024000, 100000000, 5);
//err=class_add_HTB(sock, link, 1, 0, 1, 0x8, 2048000, 100000000, 5);
//err=class_add_HTB(sock, link, 1, 0, 1, 0x9, 4096000, 100000000, 5);
//err=class_add_HTB(sock, link, 1, 0, 1, 0xa, 8192000, 100000000, 5);
//printf("Add main hash table\n");
/* create u32 first hash filter table
*
*/
/* formula calcul handle:
* uint32_t handle = (htid << 20) | (hash << 12) | nodeid;
*/
/*
* Upper limit of number of hash tables: 4096 (0xFFF)
* Number of hashes in a table: 256 values (0xFF)
*
*/
/* using 256 values for hash table
* each entry in hash table match a byte from IP address specified later by a hash key
*/
uint32_t i;
for (i = 1; i <= 0xf; i++)
u32_add_ht(sock, link, 1, i, 256);
/*
* attach a u32 filter to the first hash
* that redirects all traffic and make a hash key
* from the fist byte of the IP address
*
*/
//divisor=0x0; // unused here
//handle = 0x0; // unused here
//hash = 0x0; // unused here
//htid = 0x0; // unused here
//nodeid = 0x0; // unused here
// direction = 12 -> source IP
// direction = 16 -> destination IP
direction = 16;
/*
* which hash table will use
* in our case is hash table no 1 defined previous
*
* There are 2 posibilities to set the the hash table:
* 1. Using function get_u32_handle and sent a string in
* format 10: where 10 is number of the hash table
* 2. Create your own value in format: 0xa00000
*
*/
strcpy(chashlink, "1:");
//printf("Hash Link: %s\n", chashlink);
//chashlink=malloc(sizeof(char) *
htlink = 0x0; // is used by get_u32_handle to return the correct value of hash table (link)
if(get_u32_handle(&htlink, chashlink)) {
printf ("Illegal \"link\"");
nl_socket_free(sock);
exit(1);
}
//printf ("hash link : 0x%X\n", htlink);
//printf ("hash link test : %u\n", (htlink && TC_U32_NODE(htlink)));
if (htlink && TC_U32_NODE(htlink)) {
printf("\"link\" must be a hash table.\n");
nl_socket_free(sock);
exit(1);
}
/* the hash mask will hit the hash table (link) no 1: in our case
*/
/* set the hash key mask */
//hashmask = 0xFF000000UL; // the mask that is used to match the hash in specific table, in our case for example 1:a with mean the first byte which is 10 in hash table 1
/* Here we add a hash filter which match the first byte (see the hashmask value)
* of the source IP (offset 12 in the packet header)
* You can use also offset 16 to match the destination IP
*/
/*
* Also we need a filter to match our rule
* This mean that we will put a 0.0.0.0/0 filter in our first rule
* that match the offset 12 (source IP)
* Also you can put offset 16 to match the destination IP
*/
u32_add_filter_on_ht_with_hashmask(sock, link, 1,
0x0, 0x0, direction, 0,
0, htlink, 0xff000000, direction);
/*
* For each first byte that we need to match we will create a new hash table
* For example: you have those clases: 10.0.0.0/24 and 172.16.0.0/23
* For byte 10 and byte 172 will create a separate hash table that will match the second
* byte from each class.
*
*/
// Create a new hash table with prio 1, id 2 and 256 entries
// u32_CreateNewHashTable(sock, link, 1, 2, 256);
// Create a new hash table with prio 1, id 3 and 256 entries
// u32_CreateNewHashTable(sock, link, 1, 3, 256);
// u32_CreateNewHashTable(sock, link, 1, 4, 256);
// u32_CreateNewHashTable(sock, link, 1, 5, 256);
/*
* Now we will create other filter under (ATENTION) our first hash table (link) 1:
* Previous rule redirects the trafic according the hash mask to hash table (link) no 1:
* Here we will match the hash tables from 1:0 to 1:ff. Under each hash table we will attach
* other rules that matches next byte from IP source/destination IP and we will repeat the
* previous steps.
*
*/
// /8 check
// 10.0.0.0/8
ht=get_u32_parse_handle("1:a:");
htid = (ht&0xFFFFF000);
htlink=get_u32_parse_handle("2:");
u32_add_filter_on_ht_with_hashmask(sock, link, 1,
0x0a000000, 0xff000000, direction, 0,
htid, htlink, 0x00ff0000, direction);
// 172.0.0.0/8
ht=get_u32_parse_handle("1:ac:");
htid = (ht&0xFFFFF000);
htlink=get_u32_parse_handle("3:");
u32_add_filter_on_ht_with_hashmask(sock, link, 1,
0xac000000, 0xff000000, direction, 0,
htid, htlink, 0x00ff0000, direction);
// /16 check
// 10.0.0.0/16
ht=get_u32_parse_handle("2:0:");
htid = (ht&0xFFFFF000);
htlink=get_u32_parse_handle("4:");
u32_add_filter_on_ht_with_hashmask(sock, link, 1,
0x0a000000, 0xffff0000, direction, 0,
htid, htlink, 0x0000ff00, direction);
// 172.17.0.0/16
ht=get_u32_parse_handle("3:11:");
htid = (ht&0xFFFFF000);
htlink=get_u32_parse_handle("5:");
u32_add_filter_on_ht_with_hashmask(sock, link, 1,
0xac110000, 0xffff0000, direction, 0,
htid, htlink, 0x0000ff00, direction);
// /24 check
// 10.0.9.0/24
ht=get_u32_parse_handle("4:9:");
htid = (ht&0xFFFFF000);
htlink=get_u32_parse_handle("6:");
u32_add_filter_on_ht_with_hashmask(sock, link, 1,
0x0a000900, 0xffffff00, direction, 0,
htid, htlink, 0x000000ff, direction);
// 172.17.2.0/16
ht=get_u32_parse_handle("5:2:");
htid = (ht&0xFFFFF000);
htlink=get_u32_parse_handle("7:");
u32_add_filter_on_ht_with_hashmask(sock, link, 1,
0xac110200, 0xffffff00, direction, 0,
htid, htlink, 0x000000ff, direction);
// final filters
// 10.0.9.20
ht=get_u32_parse_handle("6:14:");
htid = (ht&0xFFFFF000);
err = get_tc_classid(&classid, "1:5");
u32_add_filter_on_ht(sock, link, 1,
0x0a000914, 0xffffffff, direction, 0,
htid, classid);
// 172.17.2.120
ht=get_u32_parse_handle("7:78:");
htid = (ht&0xFFFFF000);
err = get_tc_classid(&classid, "1:6");
u32_add_filter_on_ht(sock, link, 1,
0xac110278, 0xffffffff, direction, 0,
htid, classid);
nl_socket_free(sock);
return 0;
}
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