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linux/net/core/pktgen.c
Stephen Hemminger b7c8921bf1 [PKTGEN]: Sleeping function called under lock 
pktgen is calling kmalloc GFP_KERNEL and vmalloc with lock held.
The simplest fix is to turn the lock into a semaphore, since the
thread lock is only used for admin control from user context.

Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: Robert Olsson <robert.olsson@its.uu.se>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
2005-10-26 00:03:12 -02:00

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/*
* Authors:
* Copyright 2001, 2002 by Robert Olsson <robert.olsson@its.uu.se>
* Uppsala University and
* Swedish University of Agricultural Sciences
*
* Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
* Ben Greear <greearb@candelatech.com>
* Jens Låås <jens.laas@data.slu.se>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
*
* A tool for loading the network with preconfigurated packets.
* The tool is implemented as a linux module. Parameters are output
* device, delay (to hard_xmit), number of packets, and whether
* to use multiple SKBs or just the same one.
* pktgen uses the installed interface's output routine.
*
* Additional hacking by:
*
* Jens.Laas@data.slu.se
* Improved by ANK. 010120.
* Improved by ANK even more. 010212.
* MAC address typo fixed. 010417 --ro
* Integrated. 020301 --DaveM
* Added multiskb option 020301 --DaveM
* Scaling of results. 020417--sigurdur@linpro.no
* Significant re-work of the module:
* * Convert to threaded model to more efficiently be able to transmit
* and receive on multiple interfaces at once.
* * Converted many counters to __u64 to allow longer runs.
* * Allow configuration of ranges, like min/max IP address, MACs,
* and UDP-ports, for both source and destination, and can
* set to use a random distribution or sequentially walk the range.
* * Can now change most values after starting.
* * Place 12-byte packet in UDP payload with magic number,
* sequence number, and timestamp.
* * Add receiver code that detects dropped pkts, re-ordered pkts, and
* latencies (with micro-second) precision.
* * Add IOCTL interface to easily get counters & configuration.
* --Ben Greear <greearb@candelatech.com>
*
* Renamed multiskb to clone_skb and cleaned up sending core for two distinct
* skb modes. A clone_skb=0 mode for Ben "ranges" work and a clone_skb != 0
* as a "fastpath" with a configurable number of clones after alloc's.
* clone_skb=0 means all packets are allocated this also means ranges time
* stamps etc can be used. clone_skb=100 means 1 malloc is followed by 100
* clones.
*
* Also moved to /proc/net/pktgen/
* --ro
*
* Sept 10: Fixed threading/locking. Lots of bone-headed and more clever
* mistakes. Also merged in DaveM's patch in the -pre6 patch.
* --Ben Greear <greearb@candelatech.com>
*
* Integrated to 2.5.x 021029 --Lucio Maciel (luciomaciel@zipmail.com.br)
*
*
* 021124 Finished major redesign and rewrite for new functionality.
* See Documentation/networking/pktgen.txt for how to use this.
*
* The new operation:
* For each CPU one thread/process is created at start. This process checks
* for running devices in the if_list and sends packets until count is 0 it
* also the thread checks the thread->control which is used for inter-process
* communication. controlling process "posts" operations to the threads this
* way. The if_lock should be possible to remove when add/rem_device is merged
* into this too.
*
* By design there should only be *one* "controlling" process. In practice
* multiple write accesses gives unpredictable result. Understood by "write"
* to /proc gives result code thats should be read be the "writer".
* For pratical use this should be no problem.
*
* Note when adding devices to a specific CPU there good idea to also assign
* /proc/irq/XX/smp_affinity so TX-interrupts gets bound to the same CPU.
* --ro
*
* Fix refcount off by one if first packet fails, potential null deref,
* memleak 030710- KJP
*
* First "ranges" functionality for ipv6 030726 --ro
*
* Included flow support. 030802 ANK.
*
* Fixed unaligned access on IA-64 Grant Grundler <grundler@parisc-linux.org>
*
* Remove if fix from added Harald Welte <laforge@netfilter.org> 040419
* ia64 compilation fix from Aron Griffis <aron@hp.com> 040604
*
* New xmit() return, do_div and misc clean up by Stephen Hemminger
* <shemminger@osdl.org> 040923
*
* Rany Dunlap fixed u64 printk compiler waring
*
* Remove FCS from BW calculation. Lennert Buytenhek <buytenh@wantstofly.org>
* New time handling. Lennert Buytenhek <buytenh@wantstofly.org> 041213
*
* Corrections from Nikolai Malykh (nmalykh@bilim.com)
* Removed unused flags F_SET_SRCMAC & F_SET_SRCIP 041230
*
* interruptible_sleep_on_timeout() replaced Nishanth Aravamudan <nacc@us.ibm.com>
* 050103
*/
#include <linux/sys.h>
#include <linux/types.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/kernel.h>
#include <linux/smp_lock.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/sched.h>
#include <linux/unistd.h>
#include <linux/string.h>
#include <linux/ptrace.h>
#include <linux/errno.h>
#include <linux/ioport.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/timer.h>
#include <linux/init.h>
#include <linux/skbuff.h>
#include <linux/netdevice.h>
#include <linux/inet.h>
#include <linux/inetdevice.h>
#include <linux/rtnetlink.h>
#include <linux/if_arp.h>
#include <linux/in.h>
#include <linux/ip.h>
#include <linux/ipv6.h>
#include <linux/udp.h>
#include <linux/proc_fs.h>
#include <linux/wait.h>
#include <net/checksum.h>
#include <net/ipv6.h>
#include <net/addrconf.h>
#include <asm/byteorder.h>
#include <linux/rcupdate.h>
#include <asm/bitops.h>
#include <asm/io.h>
#include <asm/dma.h>
#include <asm/uaccess.h>
#include <asm/div64.h> /* do_div */
#include <asm/timex.h>
#define VERSION "pktgen v2.62: Packet Generator for packet performance testing.\n"
/* #define PG_DEBUG(a) a */
#define PG_DEBUG(a)
/* The buckets are exponential in 'width' */
#define LAT_BUCKETS_MAX 32
#define IP_NAME_SZ 32
/* Device flag bits */
#define F_IPSRC_RND (1<<0) /* IP-Src Random */
#define F_IPDST_RND (1<<1) /* IP-Dst Random */
#define F_UDPSRC_RND (1<<2) /* UDP-Src Random */
#define F_UDPDST_RND (1<<3) /* UDP-Dst Random */
#define F_MACSRC_RND (1<<4) /* MAC-Src Random */
#define F_MACDST_RND (1<<5) /* MAC-Dst Random */
#define F_TXSIZE_RND (1<<6) /* Transmit size is random */
#define F_IPV6 (1<<7) /* Interface in IPV6 Mode */
/* Thread control flag bits */
#define T_TERMINATE (1<<0)
#define T_STOP (1<<1) /* Stop run */
#define T_RUN (1<<2) /* Start run */
#define T_REMDEV (1<<3) /* Remove all devs */
/* Locks */
#define thread_lock() down(&pktgen_sem)
#define thread_unlock() up(&pktgen_sem)
/* If lock -- can be removed after some work */
#define if_lock(t) spin_lock(&(t->if_lock));
#define if_unlock(t) spin_unlock(&(t->if_lock));
/* Used to help with determining the pkts on receive */
#define PKTGEN_MAGIC 0xbe9be955
#define PG_PROC_DIR "net/pktgen"
#define MAX_CFLOWS 65536
struct flow_state
{
__u32 cur_daddr;
int count;
};
struct pktgen_dev {
/*
* Try to keep frequent/infrequent used vars. separated.
*/
char ifname[32];
struct proc_dir_entry *proc_ent;
char result[512];
/* proc file names */
char fname[80];
struct pktgen_thread* pg_thread; /* the owner */
struct pktgen_dev *next; /* Used for chaining in the thread's run-queue */
int running; /* if this changes to false, the test will stop */
/* If min != max, then we will either do a linear iteration, or
* we will do a random selection from within the range.
*/
__u32 flags;
int min_pkt_size; /* = ETH_ZLEN; */
int max_pkt_size; /* = ETH_ZLEN; */
int nfrags;
__u32 delay_us; /* Default delay */
__u32 delay_ns;
__u64 count; /* Default No packets to send */
__u64 sofar; /* How many pkts we've sent so far */
__u64 tx_bytes; /* How many bytes we've transmitted */
__u64 errors; /* Errors when trying to transmit, pkts will be re-sent */
/* runtime counters relating to clone_skb */
__u64 next_tx_us; /* timestamp of when to tx next */
__u32 next_tx_ns;
__u64 allocated_skbs;
__u32 clone_count;
int last_ok; /* Was last skb sent?
* Or a failed transmit of some sort? This will keep
* sequence numbers in order, for example.
*/
__u64 started_at; /* micro-seconds */
__u64 stopped_at; /* micro-seconds */
__u64 idle_acc; /* micro-seconds */
__u32 seq_num;
int clone_skb; /* Use multiple SKBs during packet gen. If this number
* is greater than 1, then that many coppies of the same
* packet will be sent before a new packet is allocated.
* For instance, if you want to send 1024 identical packets
* before creating a new packet, set clone_skb to 1024.
*/
char dst_min[IP_NAME_SZ]; /* IP, ie 1.2.3.4 */
char dst_max[IP_NAME_SZ]; /* IP, ie 1.2.3.4 */
char src_min[IP_NAME_SZ]; /* IP, ie 1.2.3.4 */
char src_max[IP_NAME_SZ]; /* IP, ie 1.2.3.4 */
struct in6_addr in6_saddr;
struct in6_addr in6_daddr;
struct in6_addr cur_in6_daddr;
struct in6_addr cur_in6_saddr;
/* For ranges */
struct in6_addr min_in6_daddr;
struct in6_addr max_in6_daddr;
struct in6_addr min_in6_saddr;
struct in6_addr max_in6_saddr;
/* If we're doing ranges, random or incremental, then this
* defines the min/max for those ranges.
*/
__u32 saddr_min; /* inclusive, source IP address */
__u32 saddr_max; /* exclusive, source IP address */
__u32 daddr_min; /* inclusive, dest IP address */
__u32 daddr_max; /* exclusive, dest IP address */
__u16 udp_src_min; /* inclusive, source UDP port */
__u16 udp_src_max; /* exclusive, source UDP port */
__u16 udp_dst_min; /* inclusive, dest UDP port */
__u16 udp_dst_max; /* exclusive, dest UDP port */
__u32 src_mac_count; /* How many MACs to iterate through */
__u32 dst_mac_count; /* How many MACs to iterate through */
unsigned char dst_mac[6];
unsigned char src_mac[6];
__u32 cur_dst_mac_offset;
__u32 cur_src_mac_offset;
__u32 cur_saddr;
__u32 cur_daddr;
__u16 cur_udp_dst;
__u16 cur_udp_src;
__u32 cur_pkt_size;
__u8 hh[14];
/* = {
0x00, 0x80, 0xC8, 0x79, 0xB3, 0xCB,
We fill in SRC address later
0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x08, 0x00
};
*/
__u16 pad; /* pad out the hh struct to an even 16 bytes */
struct sk_buff* skb; /* skb we are to transmit next, mainly used for when we
* are transmitting the same one multiple times
*/
struct net_device* odev; /* The out-going device. Note that the device should
* have it's pg_info pointer pointing back to this
* device. This will be set when the user specifies
* the out-going device name (not when the inject is
* started as it used to do.)
*/
struct flow_state *flows;
unsigned cflows; /* Concurrent flows (config) */
unsigned lflow; /* Flow length (config) */
unsigned nflows; /* accumulated flows (stats) */
};
struct pktgen_hdr {
__u32 pgh_magic;
__u32 seq_num;
__u32 tv_sec;
__u32 tv_usec;
};
struct pktgen_thread {
spinlock_t if_lock;
struct pktgen_dev *if_list; /* All device here */
struct pktgen_thread* next;
char name[32];
char fname[128]; /* name of proc file */
struct proc_dir_entry *proc_ent;
char result[512];
u32 max_before_softirq; /* We'll call do_softirq to prevent starvation. */
/* Field for thread to receive "posted" events terminate, stop ifs etc.*/
u32 control;
int pid;
int cpu;
wait_queue_head_t queue;
};
#define REMOVE 1
#define FIND 0
/* This code works around the fact that do_div cannot handle two 64-bit
numbers, and regular 64-bit division doesn't work on x86 kernels.
--Ben
*/
#define PG_DIV 0
/* This was emailed to LMKL by: Chris Caputo <ccaputo@alt.net>
* Function copied/adapted/optimized from:
*
* nemesis.sourceforge.net/browse/lib/static/intmath/ix86/intmath.c.html
*
* Copyright 1994, University of Cambridge Computer Laboratory
* All Rights Reserved.
*
*/
static inline s64 divremdi3(s64 x, s64 y, int type)
{
u64 a = (x < 0) ? -x : x;
u64 b = (y < 0) ? -y : y;
u64 res = 0, d = 1;
if (b > 0) {
while (b < a) {
b <<= 1;
d <<= 1;
}
}
do {
if ( a >= b ) {
a -= b;
res += d;
}
b >>= 1;
d >>= 1;
}
while (d);
if (PG_DIV == type) {
return (((x ^ y) & (1ll<<63)) == 0) ? res : -(s64)res;
}
else {
return ((x & (1ll<<63)) == 0) ? a : -(s64)a;
}
}
/* End of hacks to deal with 64-bit math on x86 */
/** Convert to miliseconds */
static inline __u64 tv_to_ms(const struct timeval* tv)
{
__u64 ms = tv->tv_usec / 1000;
ms += (__u64)tv->tv_sec * (__u64)1000;
return ms;
}
/** Convert to micro-seconds */
static inline __u64 tv_to_us(const struct timeval* tv)
{
__u64 us = tv->tv_usec;
us += (__u64)tv->tv_sec * (__u64)1000000;
return us;
}
static inline __u64 pg_div(__u64 n, __u32 base) {
__u64 tmp = n;
do_div(tmp, base);
/* printk("pktgen: pg_div, n: %llu base: %d rv: %llu\n",
n, base, tmp); */
return tmp;
}
static inline __u64 pg_div64(__u64 n, __u64 base)
{
__u64 tmp = n;
/*
* How do we know if the architectrure we are running on
* supports division with 64 bit base?
*
*/
#if defined(__sparc_v9__) || defined(__powerpc64__) || defined(__alpha__) || defined(__x86_64__) || defined(__ia64__)
do_div(tmp, base);
#else
tmp = divremdi3(n, base, PG_DIV);
#endif
return tmp;
}
static inline u32 pktgen_random(void)
{
#if 0
__u32 n;
get_random_bytes(&n, 4);
return n;
#else
return net_random();
#endif
}
static inline __u64 getCurMs(void)
{
struct timeval tv;
do_gettimeofday(&tv);
return tv_to_ms(&tv);
}
static inline __u64 getCurUs(void)
{
struct timeval tv;
do_gettimeofday(&tv);
return tv_to_us(&tv);
}
static inline __u64 tv_diff(const struct timeval* a, const struct timeval* b)
{
return tv_to_us(a) - tv_to_us(b);
}
/* old include end */
static char version[] __initdata = VERSION;
static ssize_t proc_pgctrl_read(struct file* file, char __user * buf, size_t count, loff_t *ppos);
static ssize_t proc_pgctrl_write(struct file* file, const char __user * buf, size_t count, loff_t *ppos);
static int proc_if_read(char *buf , char **start, off_t offset, int len, int *eof, void *data);
static int proc_thread_read(char *buf , char **start, off_t offset, int len, int *eof, void *data);
static int proc_if_write(struct file *file, const char __user *user_buffer, unsigned long count, void *data);
static int proc_thread_write(struct file *file, const char __user *user_buffer, unsigned long count, void *data);
static int create_proc_dir(void);
static int remove_proc_dir(void);
static int pktgen_remove_device(struct pktgen_thread* t, struct pktgen_dev *i);
static int pktgen_add_device(struct pktgen_thread* t, const char* ifname);
static struct pktgen_thread* pktgen_find_thread(const char* name);
static struct pktgen_dev *pktgen_find_dev(struct pktgen_thread* t, const char* ifname);
static int pktgen_device_event(struct notifier_block *, unsigned long, void *);
static void pktgen_run_all_threads(void);
static void pktgen_stop_all_threads_ifs(void);
static int pktgen_stop_device(struct pktgen_dev *pkt_dev);
static void pktgen_stop(struct pktgen_thread* t);
static void pktgen_clear_counters(struct pktgen_dev *pkt_dev);
static struct pktgen_dev *pktgen_NN_threads(const char* dev_name, int remove);
static unsigned int scan_ip6(const char *s,char ip[16]);
static unsigned int fmt_ip6(char *s,const char ip[16]);
/* Module parameters, defaults. */
static int pg_count_d = 1000; /* 1000 pkts by default */
static int pg_delay_d = 0;
static int pg_clone_skb_d = 0;
static int debug = 0;
static DECLARE_MUTEX(pktgen_sem);
static struct pktgen_thread *pktgen_threads = NULL;
static char module_fname[128];
static struct proc_dir_entry *module_proc_ent = NULL;
static struct notifier_block pktgen_notifier_block = {
.notifier_call = pktgen_device_event,
};
static struct file_operations pktgen_fops = {
.read = proc_pgctrl_read,
.write = proc_pgctrl_write,
/* .ioctl = pktgen_ioctl, later maybe */
};
/*
* /proc handling functions
*
*/
static struct proc_dir_entry *pg_proc_dir = NULL;
static int proc_pgctrl_read_eof=0;
static ssize_t proc_pgctrl_read(struct file* file, char __user * buf,
size_t count, loff_t *ppos)
{
char data[200];
int len = 0;
if(proc_pgctrl_read_eof) {
proc_pgctrl_read_eof=0;
len = 0;
goto out;
}
sprintf(data, "%s", VERSION);
len = strlen(data);
if(len > count) {
len =-EFAULT;
goto out;
}
if (copy_to_user(buf, data, len)) {
len =-EFAULT;
goto out;
}
*ppos += len;
proc_pgctrl_read_eof=1; /* EOF next call */
out:
return len;
}
static ssize_t proc_pgctrl_write(struct file* file,const char __user * buf,
size_t count, loff_t *ppos)
{
char *data = NULL;
int err = 0;
if (!capable(CAP_NET_ADMIN)){
err = -EPERM;
goto out;
}
data = (void*)vmalloc ((unsigned int)count);
if(!data) {
err = -ENOMEM;
goto out;
}
if (copy_from_user(data, buf, count)) {
err =-EFAULT;
goto out_free;
}
data[count-1] = 0; /* Make string */
if (!strcmp(data, "stop"))
pktgen_stop_all_threads_ifs();
else if (!strcmp(data, "start"))
pktgen_run_all_threads();
else
printk("pktgen: Unknown command: %s\n", data);
err = count;
out_free:
vfree (data);
out:
return err;
}
static int proc_if_read(char *buf , char **start, off_t offset,
int len, int *eof, void *data)
{
char *p;
int i;
struct pktgen_dev *pkt_dev = (struct pktgen_dev*)(data);
__u64 sa;
__u64 stopped;
__u64 now = getCurUs();
p = buf;
p += sprintf(p, "Params: count %llu min_pkt_size: %u max_pkt_size: %u\n",
(unsigned long long) pkt_dev->count,
pkt_dev->min_pkt_size, pkt_dev->max_pkt_size);
p += sprintf(p, " frags: %d delay: %u clone_skb: %d ifname: %s\n",
pkt_dev->nfrags, 1000*pkt_dev->delay_us+pkt_dev->delay_ns, pkt_dev->clone_skb, pkt_dev->ifname);
p += sprintf(p, " flows: %u flowlen: %u\n", pkt_dev->cflows, pkt_dev->lflow);
if(pkt_dev->flags & F_IPV6) {
char b1[128], b2[128], b3[128];
fmt_ip6(b1, pkt_dev->in6_saddr.s6_addr);
fmt_ip6(b2, pkt_dev->min_in6_saddr.s6_addr);
fmt_ip6(b3, pkt_dev->max_in6_saddr.s6_addr);
p += sprintf(p, " saddr: %s min_saddr: %s max_saddr: %s\n", b1, b2, b3);
fmt_ip6(b1, pkt_dev->in6_daddr.s6_addr);
fmt_ip6(b2, pkt_dev->min_in6_daddr.s6_addr);
fmt_ip6(b3, pkt_dev->max_in6_daddr.s6_addr);
p += sprintf(p, " daddr: %s min_daddr: %s max_daddr: %s\n", b1, b2, b3);
}
else
p += sprintf(p, " dst_min: %s dst_max: %s\n src_min: %s src_max: %s\n",
pkt_dev->dst_min, pkt_dev->dst_max, pkt_dev->src_min, pkt_dev->src_max);
p += sprintf(p, " src_mac: ");
if ((pkt_dev->src_mac[0] == 0) &&
(pkt_dev->src_mac[1] == 0) &&
(pkt_dev->src_mac[2] == 0) &&
(pkt_dev->src_mac[3] == 0) &&
(pkt_dev->src_mac[4] == 0) &&
(pkt_dev->src_mac[5] == 0))
for (i = 0; i < 6; i++)
p += sprintf(p, "%02X%s", pkt_dev->odev->dev_addr[i], i == 5 ? " " : ":");
else
for (i = 0; i < 6; i++)
p += sprintf(p, "%02X%s", pkt_dev->src_mac[i], i == 5 ? " " : ":");
p += sprintf(p, "dst_mac: ");
for (i = 0; i < 6; i++)
p += sprintf(p, "%02X%s", pkt_dev->dst_mac[i], i == 5 ? "\n" : ":");
p += sprintf(p, " udp_src_min: %d udp_src_max: %d udp_dst_min: %d udp_dst_max: %d\n",
pkt_dev->udp_src_min, pkt_dev->udp_src_max, pkt_dev->udp_dst_min,
pkt_dev->udp_dst_max);
p += sprintf(p, " src_mac_count: %d dst_mac_count: %d \n Flags: ",
pkt_dev->src_mac_count, pkt_dev->dst_mac_count);
if (pkt_dev->flags & F_IPV6)
p += sprintf(p, "IPV6 ");
if (pkt_dev->flags & F_IPSRC_RND)
p += sprintf(p, "IPSRC_RND ");
if (pkt_dev->flags & F_IPDST_RND)
p += sprintf(p, "IPDST_RND ");
if (pkt_dev->flags & F_TXSIZE_RND)
p += sprintf(p, "TXSIZE_RND ");
if (pkt_dev->flags & F_UDPSRC_RND)
p += sprintf(p, "UDPSRC_RND ");
if (pkt_dev->flags & F_UDPDST_RND)
p += sprintf(p, "UDPDST_RND ");
if (pkt_dev->flags & F_MACSRC_RND)
p += sprintf(p, "MACSRC_RND ");
if (pkt_dev->flags & F_MACDST_RND)
p += sprintf(p, "MACDST_RND ");
p += sprintf(p, "\n");
sa = pkt_dev->started_at;
stopped = pkt_dev->stopped_at;
if (pkt_dev->running)
stopped = now; /* not really stopped, more like last-running-at */
p += sprintf(p, "Current:\n pkts-sofar: %llu errors: %llu\n started: %lluus stopped: %lluus idle: %lluus\n",
(unsigned long long) pkt_dev->sofar,
(unsigned long long) pkt_dev->errors,
(unsigned long long) sa,
(unsigned long long) stopped,
(unsigned long long) pkt_dev->idle_acc);
p += sprintf(p, " seq_num: %d cur_dst_mac_offset: %d cur_src_mac_offset: %d\n",
pkt_dev->seq_num, pkt_dev->cur_dst_mac_offset, pkt_dev->cur_src_mac_offset);
if(pkt_dev->flags & F_IPV6) {
char b1[128], b2[128];
fmt_ip6(b1, pkt_dev->cur_in6_daddr.s6_addr);
fmt_ip6(b2, pkt_dev->cur_in6_saddr.s6_addr);
p += sprintf(p, " cur_saddr: %s cur_daddr: %s\n", b2, b1);
}
else
p += sprintf(p, " cur_saddr: 0x%x cur_daddr: 0x%x\n",
pkt_dev->cur_saddr, pkt_dev->cur_daddr);
p += sprintf(p, " cur_udp_dst: %d cur_udp_src: %d\n",
pkt_dev->cur_udp_dst, pkt_dev->cur_udp_src);
p += sprintf(p, " flows: %u\n", pkt_dev->nflows);
if (pkt_dev->result[0])
p += sprintf(p, "Result: %s\n", pkt_dev->result);
else
p += sprintf(p, "Result: Idle\n");
*eof = 1;
return p - buf;
}
static int count_trail_chars(const char __user *user_buffer, unsigned int maxlen)
{
int i;
for (i = 0; i < maxlen; i++) {
char c;
if (get_user(c, &user_buffer[i]))
return -EFAULT;
switch (c) {
case '\"':
case '\n':
case '\r':
case '\t':
case ' ':
case '=':
break;
default:
goto done;
};
}
done:
return i;
}
static unsigned long num_arg(const char __user *user_buffer, unsigned long maxlen,
unsigned long *num)
{
int i = 0;
*num = 0;
for(; i < maxlen; i++) {
char c;
if (get_user(c, &user_buffer[i]))
return -EFAULT;
if ((c >= '0') && (c <= '9')) {
*num *= 10;
*num += c -'0';
} else
break;
}
return i;
}
static int strn_len(const char __user *user_buffer, unsigned int maxlen)
{
int i = 0;
for(; i < maxlen; i++) {
char c;
if (get_user(c, &user_buffer[i]))
return -EFAULT;
switch (c) {
case '\"':
case '\n':
case '\r':
case '\t':
case ' ':
goto done_str;
break;
default:
break;
};
}
done_str:
return i;
}
static int proc_if_write(struct file *file, const char __user *user_buffer,
unsigned long count, void *data)
{
int i = 0, max, len;
char name[16], valstr[32];
unsigned long value = 0;
struct pktgen_dev *pkt_dev = (struct pktgen_dev*)(data);
char* pg_result = NULL;
int tmp = 0;
char buf[128];
pg_result = &(pkt_dev->result[0]);
if (count < 1) {
printk("pktgen: wrong command format\n");
return -EINVAL;
}
max = count - i;
tmp = count_trail_chars(&user_buffer[i], max);
if (tmp < 0) {
printk("pktgen: illegal format\n");
return tmp;
}
i += tmp;
/* Read variable name */
len = strn_len(&user_buffer[i], sizeof(name) - 1);
if (len < 0) { return len; }
memset(name, 0, sizeof(name));
if (copy_from_user(name, &user_buffer[i], len) )
return -EFAULT;
i += len;
max = count -i;
len = count_trail_chars(&user_buffer[i], max);
if (len < 0)
return len;
i += len;
if (debug) {
char tb[count + 1];
if (copy_from_user(tb, user_buffer, count))
return -EFAULT;
tb[count] = 0;
printk("pktgen: %s,%lu buffer -:%s:-\n", name, count, tb);
}
if (!strcmp(name, "min_pkt_size")) {
len = num_arg(&user_buffer[i], 10, &value);
if (len < 0) { return len; }
i += len;
if (value < 14+20+8)
value = 14+20+8;
if (value != pkt_dev->min_pkt_size) {
pkt_dev->min_pkt_size = value;
pkt_dev->cur_pkt_size = value;
}
sprintf(pg_result, "OK: min_pkt_size=%u", pkt_dev->min_pkt_size);
return count;
}
if (!strcmp(name, "max_pkt_size")) {
len = num_arg(&user_buffer[i], 10, &value);
if (len < 0) { return len; }
i += len;
if (value < 14+20+8)
value = 14+20+8;
if (value != pkt_dev->max_pkt_size) {
pkt_dev->max_pkt_size = value;
pkt_dev->cur_pkt_size = value;
}
sprintf(pg_result, "OK: max_pkt_size=%u", pkt_dev->max_pkt_size);
return count;
}
/* Shortcut for min = max */
if (!strcmp(name, "pkt_size")) {
len = num_arg(&user_buffer[i], 10, &value);
if (len < 0) { return len; }
i += len;
if (value < 14+20+8)
value = 14+20+8;
if (value != pkt_dev->min_pkt_size) {
pkt_dev->min_pkt_size = value;
pkt_dev->max_pkt_size = value;
pkt_dev->cur_pkt_size = value;
}
sprintf(pg_result, "OK: pkt_size=%u", pkt_dev->min_pkt_size);
return count;
}
if (!strcmp(name, "debug")) {
len = num_arg(&user_buffer[i], 10, &value);
if (len < 0) { return len; }
i += len;
debug = value;
sprintf(pg_result, "OK: debug=%u", debug);
return count;
}
if (!strcmp(name, "frags")) {
len = num_arg(&user_buffer[i], 10, &value);
if (len < 0) { return len; }
i += len;
pkt_dev->nfrags = value;
sprintf(pg_result, "OK: frags=%u", pkt_dev->nfrags);
return count;
}
if (!strcmp(name, "delay")) {
len = num_arg(&user_buffer[i], 10, &value);
if (len < 0) { return len; }
i += len;
if (value == 0x7FFFFFFF) {
pkt_dev->delay_us = 0x7FFFFFFF;
pkt_dev->delay_ns = 0;
} else {
pkt_dev->delay_us = value / 1000;
pkt_dev->delay_ns = value % 1000;
}
sprintf(pg_result, "OK: delay=%u", 1000*pkt_dev->delay_us+pkt_dev->delay_ns);
return count;
}
if (!strcmp(name, "udp_src_min")) {
len = num_arg(&user_buffer[i], 10, &value);
if (len < 0) { return len; }
i += len;
if (value != pkt_dev->udp_src_min) {
pkt_dev->udp_src_min = value;
pkt_dev->cur_udp_src = value;
}
sprintf(pg_result, "OK: udp_src_min=%u", pkt_dev->udp_src_min);
return count;
}
if (!strcmp(name, "udp_dst_min")) {
len = num_arg(&user_buffer[i], 10, &value);
if (len < 0) { return len; }
i += len;
if (value != pkt_dev->udp_dst_min) {
pkt_dev->udp_dst_min = value;
pkt_dev->cur_udp_dst = value;
}
sprintf(pg_result, "OK: udp_dst_min=%u", pkt_dev->udp_dst_min);
return count;
}
if (!strcmp(name, "udp_src_max")) {
len = num_arg(&user_buffer[i], 10, &value);
if (len < 0) { return len; }
i += len;
if (value != pkt_dev->udp_src_max) {
pkt_dev->udp_src_max = value;
pkt_dev->cur_udp_src = value;
}
sprintf(pg_result, "OK: udp_src_max=%u", pkt_dev->udp_src_max);
return count;
}
if (!strcmp(name, "udp_dst_max")) {
len = num_arg(&user_buffer[i], 10, &value);
if (len < 0) { return len; }
i += len;
if (value != pkt_dev->udp_dst_max) {
pkt_dev->udp_dst_max = value;
pkt_dev->cur_udp_dst = value;
}
sprintf(pg_result, "OK: udp_dst_max=%u", pkt_dev->udp_dst_max);
return count;
}
if (!strcmp(name, "clone_skb")) {
len = num_arg(&user_buffer[i], 10, &value);
if (len < 0) { return len; }
i += len;
pkt_dev->clone_skb = value;
sprintf(pg_result, "OK: clone_skb=%d", pkt_dev->clone_skb);
return count;
}
if (!strcmp(name, "count")) {
len = num_arg(&user_buffer[i], 10, &value);
if (len < 0) { return len; }
i += len;
pkt_dev->count = value;
sprintf(pg_result, "OK: count=%llu",
(unsigned long long) pkt_dev->count);
return count;
}
if (!strcmp(name, "src_mac_count")) {
len = num_arg(&user_buffer[i], 10, &value);
if (len < 0) { return len; }
i += len;
if (pkt_dev->src_mac_count != value) {
pkt_dev->src_mac_count = value;
pkt_dev->cur_src_mac_offset = 0;
}
sprintf(pg_result, "OK: src_mac_count=%d", pkt_dev->src_mac_count);
return count;
}
if (!strcmp(name, "dst_mac_count")) {
len = num_arg(&user_buffer[i], 10, &value);
if (len < 0) { return len; }
i += len;
if (pkt_dev->dst_mac_count != value) {
pkt_dev->dst_mac_count = value;
pkt_dev->cur_dst_mac_offset = 0;
}
sprintf(pg_result, "OK: dst_mac_count=%d", pkt_dev->dst_mac_count);
return count;
}
if (!strcmp(name, "flag")) {
char f[32];
memset(f, 0, 32);
len = strn_len(&user_buffer[i], sizeof(f) - 1);
if (len < 0) { return len; }
if (copy_from_user(f, &user_buffer[i], len))
return -EFAULT;
i += len;
if (strcmp(f, "IPSRC_RND") == 0)
pkt_dev->flags |= F_IPSRC_RND;
else if (strcmp(f, "!IPSRC_RND") == 0)
pkt_dev->flags &= ~F_IPSRC_RND;
else if (strcmp(f, "TXSIZE_RND") == 0)
pkt_dev->flags |= F_TXSIZE_RND;
else if (strcmp(f, "!TXSIZE_RND") == 0)
pkt_dev->flags &= ~F_TXSIZE_RND;
else if (strcmp(f, "IPDST_RND") == 0)
pkt_dev->flags |= F_IPDST_RND;
else if (strcmp(f, "!IPDST_RND") == 0)
pkt_dev->flags &= ~F_IPDST_RND;
else if (strcmp(f, "UDPSRC_RND") == 0)
pkt_dev->flags |= F_UDPSRC_RND;
else if (strcmp(f, "!UDPSRC_RND") == 0)
pkt_dev->flags &= ~F_UDPSRC_RND;
else if (strcmp(f, "UDPDST_RND") == 0)
pkt_dev->flags |= F_UDPDST_RND;
else if (strcmp(f, "!UDPDST_RND") == 0)
pkt_dev->flags &= ~F_UDPDST_RND;
else if (strcmp(f, "MACSRC_RND") == 0)
pkt_dev->flags |= F_MACSRC_RND;
else if (strcmp(f, "!MACSRC_RND") == 0)
pkt_dev->flags &= ~F_MACSRC_RND;
else if (strcmp(f, "MACDST_RND") == 0)
pkt_dev->flags |= F_MACDST_RND;
else if (strcmp(f, "!MACDST_RND") == 0)
pkt_dev->flags &= ~F_MACDST_RND;
else {
sprintf(pg_result, "Flag -:%s:- unknown\nAvailable flags, (prepend ! to un-set flag):\n%s",
f,
"IPSRC_RND, IPDST_RND, TXSIZE_RND, UDPSRC_RND, UDPDST_RND, MACSRC_RND, MACDST_RND\n");
return count;
}
sprintf(pg_result, "OK: flags=0x%x", pkt_dev->flags);
return count;
}
if (!strcmp(name, "dst_min") || !strcmp(name, "dst")) {
len = strn_len(&user_buffer[i], sizeof(pkt_dev->dst_min) - 1);
if (len < 0) { return len; }
if (copy_from_user(buf, &user_buffer[i], len))
return -EFAULT;
buf[len] = 0;
if (strcmp(buf, pkt_dev->dst_min) != 0) {
memset(pkt_dev->dst_min, 0, sizeof(pkt_dev->dst_min));
strncpy(pkt_dev->dst_min, buf, len);
pkt_dev->daddr_min = in_aton(pkt_dev->dst_min);
pkt_dev->cur_daddr = pkt_dev->daddr_min;
}
if(debug)
printk("pktgen: dst_min set to: %s\n", pkt_dev->dst_min);
i += len;
sprintf(pg_result, "OK: dst_min=%s", pkt_dev->dst_min);
return count;
}
if (!strcmp(name, "dst_max")) {
len = strn_len(&user_buffer[i], sizeof(pkt_dev->dst_max) - 1);
if (len < 0) { return len; }
if (copy_from_user(buf, &user_buffer[i], len))
return -EFAULT;
buf[len] = 0;
if (strcmp(buf, pkt_dev->dst_max) != 0) {
memset(pkt_dev->dst_max, 0, sizeof(pkt_dev->dst_max));
strncpy(pkt_dev->dst_max, buf, len);
pkt_dev->daddr_max = in_aton(pkt_dev->dst_max);
pkt_dev->cur_daddr = pkt_dev->daddr_max;
}
if(debug)
printk("pktgen: dst_max set to: %s\n", pkt_dev->dst_max);
i += len;
sprintf(pg_result, "OK: dst_max=%s", pkt_dev->dst_max);
return count;
}
if (!strcmp(name, "dst6")) {
len = strn_len(&user_buffer[i], sizeof(buf) - 1);
if (len < 0) return len;
pkt_dev->flags |= F_IPV6;
if (copy_from_user(buf, &user_buffer[i], len))
return -EFAULT;
buf[len] = 0;
scan_ip6(buf, pkt_dev->in6_daddr.s6_addr);
fmt_ip6(buf, pkt_dev->in6_daddr.s6_addr);
ipv6_addr_copy(&pkt_dev->cur_in6_daddr, &pkt_dev->in6_daddr);
if(debug)
printk("pktgen: dst6 set to: %s\n", buf);
i += len;
sprintf(pg_result, "OK: dst6=%s", buf);
return count;
}
if (!strcmp(name, "dst6_min")) {
len = strn_len(&user_buffer[i], sizeof(buf) - 1);
if (len < 0) return len;
pkt_dev->flags |= F_IPV6;
if (copy_from_user(buf, &user_buffer[i], len))
return -EFAULT;
buf[len] = 0;
scan_ip6(buf, pkt_dev->min_in6_daddr.s6_addr);
fmt_ip6(buf, pkt_dev->min_in6_daddr.s6_addr);
ipv6_addr_copy(&pkt_dev->cur_in6_daddr, &pkt_dev->min_in6_daddr);
if(debug)
printk("pktgen: dst6_min set to: %s\n", buf);
i += len;
sprintf(pg_result, "OK: dst6_min=%s", buf);
return count;
}
if (!strcmp(name, "dst6_max")) {
len = strn_len(&user_buffer[i], sizeof(buf) - 1);
if (len < 0) return len;
pkt_dev->flags |= F_IPV6;
if (copy_from_user(buf, &user_buffer[i], len))
return -EFAULT;
buf[len] = 0;
scan_ip6(buf, pkt_dev->max_in6_daddr.s6_addr);
fmt_ip6(buf, pkt_dev->max_in6_daddr.s6_addr);
if(debug)
printk("pktgen: dst6_max set to: %s\n", buf);
i += len;
sprintf(pg_result, "OK: dst6_max=%s", buf);
return count;
}
if (!strcmp(name, "src6")) {
len = strn_len(&user_buffer[i], sizeof(buf) - 1);
if (len < 0) return len;
pkt_dev->flags |= F_IPV6;
if (copy_from_user(buf, &user_buffer[i], len))
return -EFAULT;
buf[len] = 0;
scan_ip6(buf, pkt_dev->in6_saddr.s6_addr);
fmt_ip6(buf, pkt_dev->in6_saddr.s6_addr);
ipv6_addr_copy(&pkt_dev->cur_in6_saddr, &pkt_dev->in6_saddr);
if(debug)
printk("pktgen: src6 set to: %s\n", buf);
i += len;
sprintf(pg_result, "OK: src6=%s", buf);
return count;
}
if (!strcmp(name, "src_min")) {
len = strn_len(&user_buffer[i], sizeof(pkt_dev->src_min) - 1);
if (len < 0) { return len; }
if (copy_from_user(buf, &user_buffer[i], len))
return -EFAULT;
buf[len] = 0;
if (strcmp(buf, pkt_dev->src_min) != 0) {
memset(pkt_dev->src_min, 0, sizeof(pkt_dev->src_min));
strncpy(pkt_dev->src_min, buf, len);
pkt_dev->saddr_min = in_aton(pkt_dev->src_min);
pkt_dev->cur_saddr = pkt_dev->saddr_min;
}
if(debug)
printk("pktgen: src_min set to: %s\n", pkt_dev->src_min);
i += len;
sprintf(pg_result, "OK: src_min=%s", pkt_dev->src_min);
return count;
}
if (!strcmp(name, "src_max")) {
len = strn_len(&user_buffer[i], sizeof(pkt_dev->src_max) - 1);
if (len < 0) { return len; }
if (copy_from_user(buf, &user_buffer[i], len))
return -EFAULT;
buf[len] = 0;
if (strcmp(buf, pkt_dev->src_max) != 0) {
memset(pkt_dev->src_max, 0, sizeof(pkt_dev->src_max));
strncpy(pkt_dev->src_max, buf, len);
pkt_dev->saddr_max = in_aton(pkt_dev->src_max);
pkt_dev->cur_saddr = pkt_dev->saddr_max;
}
if(debug)
printk("pktgen: src_max set to: %s\n", pkt_dev->src_max);
i += len;
sprintf(pg_result, "OK: src_max=%s", pkt_dev->src_max);
return count;
}
if (!strcmp(name, "dst_mac")) {
char *v = valstr;
unsigned char old_dmac[6];
unsigned char *m = pkt_dev->dst_mac;
memcpy(old_dmac, pkt_dev->dst_mac, 6);
len = strn_len(&user_buffer[i], sizeof(valstr) - 1);
if (len < 0) { return len; }
memset(valstr, 0, sizeof(valstr));
if( copy_from_user(valstr, &user_buffer[i], len))
return -EFAULT;
i += len;
for(*m = 0;*v && m < pkt_dev->dst_mac + 6; v++) {
if (*v >= '0' && *v <= '9') {
*m *= 16;
*m += *v - '0';
}
if (*v >= 'A' && *v <= 'F') {
*m *= 16;
*m += *v - 'A' + 10;
}
if (*v >= 'a' && *v <= 'f') {
*m *= 16;
*m += *v - 'a' + 10;
}
if (*v == ':') {
m++;
*m = 0;
}
}
/* Set up Dest MAC */
if (memcmp(old_dmac, pkt_dev->dst_mac, 6) != 0)
memcpy(&(pkt_dev->hh[0]), pkt_dev->dst_mac, 6);
sprintf(pg_result, "OK: dstmac");
return count;
}
if (!strcmp(name, "src_mac")) {
char *v = valstr;
unsigned char *m = pkt_dev->src_mac;
len = strn_len(&user_buffer[i], sizeof(valstr) - 1);
if (len < 0) { return len; }
memset(valstr, 0, sizeof(valstr));
if( copy_from_user(valstr, &user_buffer[i], len))
return -EFAULT;
i += len;
for(*m = 0;*v && m < pkt_dev->src_mac + 6; v++) {
if (*v >= '0' && *v <= '9') {
*m *= 16;
*m += *v - '0';
}
if (*v >= 'A' && *v <= 'F') {
*m *= 16;
*m += *v - 'A' + 10;
}
if (*v >= 'a' && *v <= 'f') {
*m *= 16;
*m += *v - 'a' + 10;
}
if (*v == ':') {
m++;
*m = 0;
}
}
sprintf(pg_result, "OK: srcmac");
return count;
}
if (!strcmp(name, "clear_counters")) {
pktgen_clear_counters(pkt_dev);
sprintf(pg_result, "OK: Clearing counters.\n");
return count;
}
if (!strcmp(name, "flows")) {
len = num_arg(&user_buffer[i], 10, &value);
if (len < 0) { return len; }
i += len;
if (value > MAX_CFLOWS)
value = MAX_CFLOWS;
pkt_dev->cflows = value;
sprintf(pg_result, "OK: flows=%u", pkt_dev->cflows);
return count;
}
if (!strcmp(name, "flowlen")) {
len = num_arg(&user_buffer[i], 10, &value);
if (len < 0) { return len; }
i += len;
pkt_dev->lflow = value;
sprintf(pg_result, "OK: flowlen=%u", pkt_dev->lflow);
return count;
}
sprintf(pkt_dev->result, "No such parameter \"%s\"", name);
return -EINVAL;
}
static int proc_thread_read(char *buf , char **start, off_t offset,
int len, int *eof, void *data)
{
char *p;
struct pktgen_thread *t = (struct pktgen_thread*)(data);
struct pktgen_dev *pkt_dev = NULL;
if (!t) {
printk("pktgen: ERROR: could not find thread in proc_thread_read\n");
return -EINVAL;
}
p = buf;
p += sprintf(p, "Name: %s max_before_softirq: %d\n",
t->name, t->max_before_softirq);
p += sprintf(p, "Running: ");
if_lock(t);
for(pkt_dev = t->if_list;pkt_dev; pkt_dev = pkt_dev->next)
if(pkt_dev->running)
p += sprintf(p, "%s ", pkt_dev->ifname);
p += sprintf(p, "\nStopped: ");
for(pkt_dev = t->if_list;pkt_dev; pkt_dev = pkt_dev->next)
if(!pkt_dev->running)
p += sprintf(p, "%s ", pkt_dev->ifname);
if (t->result[0])
p += sprintf(p, "\nResult: %s\n", t->result);
else
p += sprintf(p, "\nResult: NA\n");
*eof = 1;
if_unlock(t);
return p - buf;
}
static int proc_thread_write(struct file *file, const char __user *user_buffer,
unsigned long count, void *data)
{
int i = 0, max, len, ret;
char name[40];
struct pktgen_thread *t;
char *pg_result;
unsigned long value = 0;
if (count < 1) {
// sprintf(pg_result, "Wrong command format");
return -EINVAL;
}
max = count - i;
len = count_trail_chars(&user_buffer[i], max);
if (len < 0)
return len;
i += len;
/* Read variable name */
len = strn_len(&user_buffer[i], sizeof(name) - 1);
if (len < 0)
return len;
memset(name, 0, sizeof(name));
if (copy_from_user(name, &user_buffer[i], len))
return -EFAULT;
i += len;
max = count -i;
len = count_trail_chars(&user_buffer[i], max);
if (len < 0)
return len;
i += len;
if (debug)
printk("pktgen: t=%s, count=%lu\n", name, count);
t = (struct pktgen_thread*)(data);
if(!t) {
printk("pktgen: ERROR: No thread\n");
ret = -EINVAL;
goto out;
}
pg_result = &(t->result[0]);
if (!strcmp(name, "add_device")) {
char f[32];
memset(f, 0, 32);
len = strn_len(&user_buffer[i], sizeof(f) - 1);
if (len < 0) {
ret = len;
goto out;
}
if( copy_from_user(f, &user_buffer[i], len) )
return -EFAULT;
i += len;
thread_lock();
pktgen_add_device(t, f);
thread_unlock();
ret = count;
sprintf(pg_result, "OK: add_device=%s", f);
goto out;
}
if (!strcmp(name, "rem_device_all")) {
thread_lock();
t->control |= T_REMDEV;
thread_unlock();
schedule_timeout_interruptible(msecs_to_jiffies(125)); /* Propagate thread->control */
ret = count;
sprintf(pg_result, "OK: rem_device_all");
goto out;
}
if (!strcmp(name, "max_before_softirq")) {
len = num_arg(&user_buffer[i], 10, &value);
thread_lock();
t->max_before_softirq = value;
thread_unlock();
ret = count;
sprintf(pg_result, "OK: max_before_softirq=%lu", value);
goto out;
}
ret = -EINVAL;
out:
return ret;
}
static int create_proc_dir(void)
{
pg_proc_dir = proc_mkdir(PG_PROC_DIR, NULL);
if (!pg_proc_dir)
return -ENODEV;
return 0;
}
static int remove_proc_dir(void)
{
remove_proc_entry(PG_PROC_DIR, NULL);
return 0;
}
/* Think find or remove for NN */
static struct pktgen_dev *__pktgen_NN_threads(const char* ifname, int remove)
{
struct pktgen_thread *t;
struct pktgen_dev *pkt_dev = NULL;
t = pktgen_threads;
while (t) {
pkt_dev = pktgen_find_dev(t, ifname);
if (pkt_dev) {
if(remove) {
if_lock(t);
pktgen_remove_device(t, pkt_dev);
if_unlock(t);
}
break;
}
t = t->next;
}
return pkt_dev;
}
static struct pktgen_dev *pktgen_NN_threads(const char* ifname, int remove)
{
struct pktgen_dev *pkt_dev = NULL;
thread_lock();
pkt_dev = __pktgen_NN_threads(ifname, remove);
thread_unlock();
return pkt_dev;
}
static int pktgen_device_event(struct notifier_block *unused, unsigned long event, void *ptr)
{
struct net_device *dev = (struct net_device *)(ptr);
/* It is OK that we do not hold the group lock right now,
* as we run under the RTNL lock.
*/
switch (event) {
case NETDEV_CHANGEADDR:
case NETDEV_GOING_DOWN:
case NETDEV_DOWN:
case NETDEV_UP:
/* Ignore for now */
break;
case NETDEV_UNREGISTER:
pktgen_NN_threads(dev->name, REMOVE);
break;
};
return NOTIFY_DONE;
}
/* Associate pktgen_dev with a device. */
static struct net_device* pktgen_setup_dev(struct pktgen_dev *pkt_dev) {
struct net_device *odev;
/* Clean old setups */
if (pkt_dev->odev) {
dev_put(pkt_dev->odev);
pkt_dev->odev = NULL;
}
odev = dev_get_by_name(pkt_dev->ifname);
if (!odev) {
printk("pktgen: no such netdevice: \"%s\"\n", pkt_dev->ifname);
goto out;
}
if (odev->type != ARPHRD_ETHER) {
printk("pktgen: not an ethernet device: \"%s\"\n", pkt_dev->ifname);
goto out_put;
}
if (!netif_running(odev)) {
printk("pktgen: device is down: \"%s\"\n", pkt_dev->ifname);
goto out_put;
}
pkt_dev->odev = odev;
return pkt_dev->odev;
out_put:
dev_put(odev);
out:
return NULL;
}
/* Read pkt_dev from the interface and set up internal pktgen_dev
* structure to have the right information to create/send packets
*/
static void pktgen_setup_inject(struct pktgen_dev *pkt_dev)
{
/* Try once more, just in case it works now. */
if (!pkt_dev->odev)
pktgen_setup_dev(pkt_dev);
if (!pkt_dev->odev) {
printk("pktgen: ERROR: pkt_dev->odev == NULL in setup_inject.\n");
sprintf(pkt_dev->result, "ERROR: pkt_dev->odev == NULL in setup_inject.\n");
return;
}
/* Default to the interface's mac if not explicitly set. */
if ((pkt_dev->src_mac[0] == 0) &&
(pkt_dev->src_mac[1] == 0) &&
(pkt_dev->src_mac[2] == 0) &&
(pkt_dev->src_mac[3] == 0) &&
(pkt_dev->src_mac[4] == 0) &&
(pkt_dev->src_mac[5] == 0)) {
memcpy(&(pkt_dev->hh[6]), pkt_dev->odev->dev_addr, 6);
}
/* Set up Dest MAC */
memcpy(&(pkt_dev->hh[0]), pkt_dev->dst_mac, 6);
/* Set up pkt size */
pkt_dev->cur_pkt_size = pkt_dev->min_pkt_size;
if(pkt_dev->flags & F_IPV6) {
/*
* Skip this automatic address setting until locks or functions
* gets exported
*/
#ifdef NOTNOW
int i, set = 0, err=1;
struct inet6_dev *idev;
for(i=0; i< IN6_ADDR_HSIZE; i++)
if(pkt_dev->cur_in6_saddr.s6_addr[i]) {
set = 1;
break;
}
if(!set) {
/*
* Use linklevel address if unconfigured.
*
* use ipv6_get_lladdr if/when it's get exported
*/
read_lock(&addrconf_lock);
if ((idev = __in6_dev_get(pkt_dev->odev)) != NULL) {
struct inet6_ifaddr *ifp;
read_lock_bh(&idev->lock);
for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
ipv6_addr_copy(&pkt_dev->cur_in6_saddr, &ifp->addr);
err = 0;
break;
}
}
read_unlock_bh(&idev->lock);
}
read_unlock(&addrconf_lock);
if(err) printk("pktgen: ERROR: IPv6 link address not availble.\n");
}
#endif
}
else {
pkt_dev->saddr_min = 0;
pkt_dev->saddr_max = 0;
if (strlen(pkt_dev->src_min) == 0) {
struct in_device *in_dev;
rcu_read_lock();
in_dev = __in_dev_get_rcu(pkt_dev->odev);
if (in_dev) {
if (in_dev->ifa_list) {
pkt_dev->saddr_min = in_dev->ifa_list->ifa_address;
pkt_dev->saddr_max = pkt_dev->saddr_min;
}
}
rcu_read_unlock();
}
else {
pkt_dev->saddr_min = in_aton(pkt_dev->src_min);
pkt_dev->saddr_max = in_aton(pkt_dev->src_max);
}
pkt_dev->daddr_min = in_aton(pkt_dev->dst_min);
pkt_dev->daddr_max = in_aton(pkt_dev->dst_max);
}
/* Initialize current values. */
pkt_dev->cur_dst_mac_offset = 0;
pkt_dev->cur_src_mac_offset = 0;
pkt_dev->cur_saddr = pkt_dev->saddr_min;
pkt_dev->cur_daddr = pkt_dev->daddr_min;
pkt_dev->cur_udp_dst = pkt_dev->udp_dst_min;
pkt_dev->cur_udp_src = pkt_dev->udp_src_min;
pkt_dev->nflows = 0;
}
static void spin(struct pktgen_dev *pkt_dev, __u64 spin_until_us)
{
__u64 start;
__u64 now;
start = now = getCurUs();
printk(KERN_INFO "sleeping for %d\n", (int)(spin_until_us - now));
while (now < spin_until_us) {
/* TODO: optimise sleeping behavior */
if (spin_until_us - now > jiffies_to_usecs(1)+1)
schedule_timeout_interruptible(1);
else if (spin_until_us - now > 100) {
do_softirq();
if (!pkt_dev->running)
return;
if (need_resched())
schedule();
}
now = getCurUs();
}
pkt_dev->idle_acc += now - start;
}
/* Increment/randomize headers according to flags and current values
* for IP src/dest, UDP src/dst port, MAC-Addr src/dst
*/
static void mod_cur_headers(struct pktgen_dev *pkt_dev) {
__u32 imn;
__u32 imx;
int flow = 0;
if(pkt_dev->cflows) {
flow = pktgen_random() % pkt_dev->cflows;
if (pkt_dev->flows[flow].count > pkt_dev->lflow)
pkt_dev->flows[flow].count = 0;
}
/* Deal with source MAC */
if (pkt_dev->src_mac_count > 1) {
__u32 mc;
__u32 tmp;
if (pkt_dev->flags & F_MACSRC_RND)
mc = pktgen_random() % (pkt_dev->src_mac_count);
else {
mc = pkt_dev->cur_src_mac_offset++;
if (pkt_dev->cur_src_mac_offset > pkt_dev->src_mac_count)
pkt_dev->cur_src_mac_offset = 0;
}
tmp = pkt_dev->src_mac[5] + (mc & 0xFF);
pkt_dev->hh[11] = tmp;
tmp = (pkt_dev->src_mac[4] + ((mc >> 8) & 0xFF) + (tmp >> 8));
pkt_dev->hh[10] = tmp;
tmp = (pkt_dev->src_mac[3] + ((mc >> 16) & 0xFF) + (tmp >> 8));
pkt_dev->hh[9] = tmp;
tmp = (pkt_dev->src_mac[2] + ((mc >> 24) & 0xFF) + (tmp >> 8));
pkt_dev->hh[8] = tmp;
tmp = (pkt_dev->src_mac[1] + (tmp >> 8));
pkt_dev->hh[7] = tmp;
}
/* Deal with Destination MAC */
if (pkt_dev->dst_mac_count > 1) {
__u32 mc;
__u32 tmp;
if (pkt_dev->flags & F_MACDST_RND)
mc = pktgen_random() % (pkt_dev->dst_mac_count);
else {
mc = pkt_dev->cur_dst_mac_offset++;
if (pkt_dev->cur_dst_mac_offset > pkt_dev->dst_mac_count) {
pkt_dev->cur_dst_mac_offset = 0;
}
}
tmp = pkt_dev->dst_mac[5] + (mc & 0xFF);
pkt_dev->hh[5] = tmp;
tmp = (pkt_dev->dst_mac[4] + ((mc >> 8) & 0xFF) + (tmp >> 8));
pkt_dev->hh[4] = tmp;
tmp = (pkt_dev->dst_mac[3] + ((mc >> 16) & 0xFF) + (tmp >> 8));
pkt_dev->hh[3] = tmp;
tmp = (pkt_dev->dst_mac[2] + ((mc >> 24) & 0xFF) + (tmp >> 8));
pkt_dev->hh[2] = tmp;
tmp = (pkt_dev->dst_mac[1] + (tmp >> 8));
pkt_dev->hh[1] = tmp;
}
if (pkt_dev->udp_src_min < pkt_dev->udp_src_max) {
if (pkt_dev->flags & F_UDPSRC_RND)
pkt_dev->cur_udp_src = ((pktgen_random() % (pkt_dev->udp_src_max - pkt_dev->udp_src_min)) + pkt_dev->udp_src_min);
else {
pkt_dev->cur_udp_src++;
if (pkt_dev->cur_udp_src >= pkt_dev->udp_src_max)
pkt_dev->cur_udp_src = pkt_dev->udp_src_min;
}
}
if (pkt_dev->udp_dst_min < pkt_dev->udp_dst_max) {
if (pkt_dev->flags & F_UDPDST_RND) {
pkt_dev->cur_udp_dst = ((pktgen_random() % (pkt_dev->udp_dst_max - pkt_dev->udp_dst_min)) + pkt_dev->udp_dst_min);
}
else {
pkt_dev->cur_udp_dst++;
if (pkt_dev->cur_udp_dst >= pkt_dev->udp_dst_max)
pkt_dev->cur_udp_dst = pkt_dev->udp_dst_min;
}
}
if (!(pkt_dev->flags & F_IPV6)) {
if ((imn = ntohl(pkt_dev->saddr_min)) < (imx = ntohl(pkt_dev->saddr_max))) {
__u32 t;
if (pkt_dev->flags & F_IPSRC_RND)
t = ((pktgen_random() % (imx - imn)) + imn);
else {
t = ntohl(pkt_dev->cur_saddr);
t++;
if (t > imx) {
t = imn;
}
}
pkt_dev->cur_saddr = htonl(t);
}
if (pkt_dev->cflows && pkt_dev->flows[flow].count != 0) {
pkt_dev->cur_daddr = pkt_dev->flows[flow].cur_daddr;
} else {
if ((imn = ntohl(pkt_dev->daddr_min)) < (imx = ntohl(pkt_dev->daddr_max))) {
__u32 t;
if (pkt_dev->flags & F_IPDST_RND) {
t = ((pktgen_random() % (imx - imn)) + imn);
t = htonl(t);
while( LOOPBACK(t) || MULTICAST(t) || BADCLASS(t) || ZERONET(t) || LOCAL_MCAST(t) ) {
t = ((pktgen_random() % (imx - imn)) + imn);
t = htonl(t);
}
pkt_dev->cur_daddr = t;
}
else {
t = ntohl(pkt_dev->cur_daddr);
t++;
if (t > imx) {
t = imn;
}
pkt_dev->cur_daddr = htonl(t);
}
}
if(pkt_dev->cflows) {
pkt_dev->flows[flow].cur_daddr = pkt_dev->cur_daddr;
pkt_dev->nflows++;
}
}
}
else /* IPV6 * */
{
if(pkt_dev->min_in6_daddr.s6_addr32[0] == 0 &&
pkt_dev->min_in6_daddr.s6_addr32[1] == 0 &&
pkt_dev->min_in6_daddr.s6_addr32[2] == 0 &&
pkt_dev->min_in6_daddr.s6_addr32[3] == 0);
else {
int i;
/* Only random destinations yet */
for(i=0; i < 4; i++) {
pkt_dev->cur_in6_daddr.s6_addr32[i] =
((pktgen_random() |
pkt_dev->min_in6_daddr.s6_addr32[i]) &
pkt_dev->max_in6_daddr.s6_addr32[i]);
}
}
}
if (pkt_dev->min_pkt_size < pkt_dev->max_pkt_size) {
__u32 t;
if (pkt_dev->flags & F_TXSIZE_RND) {
t = ((pktgen_random() % (pkt_dev->max_pkt_size - pkt_dev->min_pkt_size))
+ pkt_dev->min_pkt_size);
}
else {
t = pkt_dev->cur_pkt_size + 1;
if (t > pkt_dev->max_pkt_size)
t = pkt_dev->min_pkt_size;
}
pkt_dev->cur_pkt_size = t;
}
pkt_dev->flows[flow].count++;
}
static struct sk_buff *fill_packet_ipv4(struct net_device *odev,
struct pktgen_dev *pkt_dev)
{
struct sk_buff *skb = NULL;
__u8 *eth;
struct udphdr *udph;
int datalen, iplen;
struct iphdr *iph;
struct pktgen_hdr *pgh = NULL;
/* Update any of the values, used when we're incrementing various
* fields.
*/
mod_cur_headers(pkt_dev);
skb = alloc_skb(pkt_dev->cur_pkt_size + 64 + 16, GFP_ATOMIC);
if (!skb) {
sprintf(pkt_dev->result, "No memory");
return NULL;
}
skb_reserve(skb, 16);
/* Reserve for ethernet and IP header */
eth = (__u8 *) skb_push(skb, 14);
iph = (struct iphdr *)skb_put(skb, sizeof(struct iphdr));
udph = (struct udphdr *)skb_put(skb, sizeof(struct udphdr));
memcpy(eth, pkt_dev->hh, 12);
*(u16*)&eth[12] = __constant_htons(ETH_P_IP);
datalen = pkt_dev->cur_pkt_size - 14 - 20 - 8; /* Eth + IPh + UDPh */
if (datalen < sizeof(struct pktgen_hdr))
datalen = sizeof(struct pktgen_hdr);
udph->source = htons(pkt_dev->cur_udp_src);
udph->dest = htons(pkt_dev->cur_udp_dst);
udph->len = htons(datalen + 8); /* DATA + udphdr */
udph->check = 0; /* No checksum */
iph->ihl = 5;
iph->version = 4;
iph->ttl = 32;
iph->tos = 0;
iph->protocol = IPPROTO_UDP; /* UDP */
iph->saddr = pkt_dev->cur_saddr;
iph->daddr = pkt_dev->cur_daddr;
iph->frag_off = 0;
iplen = 20 + 8 + datalen;
iph->tot_len = htons(iplen);
iph->check = 0;
iph->check = ip_fast_csum((void *) iph, iph->ihl);
skb->protocol = __constant_htons(ETH_P_IP);
skb->mac.raw = ((u8 *)iph) - 14;
skb->dev = odev;
skb->pkt_type = PACKET_HOST;
if (pkt_dev->nfrags <= 0)
pgh = (struct pktgen_hdr *)skb_put(skb, datalen);
else {
int frags = pkt_dev->nfrags;
int i;
pgh = (struct pktgen_hdr*)(((char*)(udph)) + 8);
if (frags > MAX_SKB_FRAGS)
frags = MAX_SKB_FRAGS;
if (datalen > frags*PAGE_SIZE) {
skb_put(skb, datalen-frags*PAGE_SIZE);
datalen = frags*PAGE_SIZE;
}
i = 0;
while (datalen > 0) {
struct page *page = alloc_pages(GFP_KERNEL, 0);
skb_shinfo(skb)->frags[i].page = page;
skb_shinfo(skb)->frags[i].page_offset = 0;
skb_shinfo(skb)->frags[i].size =
(datalen < PAGE_SIZE ? datalen : PAGE_SIZE);
datalen -= skb_shinfo(skb)->frags[i].size;
skb->len += skb_shinfo(skb)->frags[i].size;
skb->data_len += skb_shinfo(skb)->frags[i].size;
i++;
skb_shinfo(skb)->nr_frags = i;
}
while (i < frags) {
int rem;
if (i == 0)
break;
rem = skb_shinfo(skb)->frags[i - 1].size / 2;
if (rem == 0)
break;
skb_shinfo(skb)->frags[i - 1].size -= rem;
skb_shinfo(skb)->frags[i] = skb_shinfo(skb)->frags[i - 1];
get_page(skb_shinfo(skb)->frags[i].page);
skb_shinfo(skb)->frags[i].page = skb_shinfo(skb)->frags[i - 1].page;
skb_shinfo(skb)->frags[i].page_offset += skb_shinfo(skb)->frags[i - 1].size;
skb_shinfo(skb)->frags[i].size = rem;
i++;
skb_shinfo(skb)->nr_frags = i;
}
}
/* Stamp the time, and sequence number, convert them to network byte order */
if (pgh) {
struct timeval timestamp;
pgh->pgh_magic = htonl(PKTGEN_MAGIC);
pgh->seq_num = htonl(pkt_dev->seq_num);
do_gettimeofday(&timestamp);
pgh->tv_sec = htonl(timestamp.tv_sec);
pgh->tv_usec = htonl(timestamp.tv_usec);
}
pkt_dev->seq_num++;
return skb;
}
/*
* scan_ip6, fmt_ip taken from dietlibc-0.21
* Author Felix von Leitner <felix-dietlibc@fefe.de>
*
* Slightly modified for kernel.
* Should be candidate for net/ipv4/utils.c
* --ro
*/
static unsigned int scan_ip6(const char *s,char ip[16])
{
unsigned int i;
unsigned int len=0;
unsigned long u;
char suffix[16];
unsigned int prefixlen=0;
unsigned int suffixlen=0;
__u32 tmp;
for (i=0; i<16; i++) ip[i]=0;
for (;;) {
if (*s == ':') {
len++;
if (s[1] == ':') { /* Found "::", skip to part 2 */
s+=2;
len++;
break;
}
s++;
}
{
char *tmp;
u=simple_strtoul(s,&tmp,16);
i=tmp-s;
}
if (!i) return 0;
if (prefixlen==12 && s[i]=='.') {
/* the last 4 bytes may be written as IPv4 address */
tmp = in_aton(s);
memcpy((struct in_addr*)(ip+12), &tmp, sizeof(tmp));
return i+len;
}
ip[prefixlen++] = (u >> 8);
ip[prefixlen++] = (u & 255);
s += i; len += i;
if (prefixlen==16)
return len;
}
/* part 2, after "::" */
for (;;) {
if (*s == ':') {
if (suffixlen==0)
break;
s++;
len++;
} else if (suffixlen!=0)
break;
{
char *tmp;
u=simple_strtol(s,&tmp,16);
i=tmp-s;
}
if (!i) {
if (*s) len--;
break;
}
if (suffixlen+prefixlen<=12 && s[i]=='.') {
tmp = in_aton(s);
memcpy((struct in_addr*)(suffix+suffixlen), &tmp, sizeof(tmp));
suffixlen+=4;
len+=strlen(s);
break;
}
suffix[suffixlen++] = (u >> 8);
suffix[suffixlen++] = (u & 255);
s += i; len += i;
if (prefixlen+suffixlen==16)
break;
}
for (i=0; i<suffixlen; i++)
ip[16-suffixlen+i] = suffix[i];
return len;
}
static char tohex(char hexdigit) {
return hexdigit>9?hexdigit+'a'-10:hexdigit+'0';
}
static int fmt_xlong(char* s,unsigned int i) {
char* bak=s;
*s=tohex((i>>12)&0xf); if (s!=bak || *s!='0') ++s;
*s=tohex((i>>8)&0xf); if (s!=bak || *s!='0') ++s;
*s=tohex((i>>4)&0xf); if (s!=bak || *s!='0') ++s;
*s=tohex(i&0xf);
return s-bak+1;
}
static unsigned int fmt_ip6(char *s,const char ip[16]) {
unsigned int len;
unsigned int i;
unsigned int temp;
unsigned int compressing;
int j;
len = 0; compressing = 0;
for (j=0; j<16; j+=2) {
#ifdef V4MAPPEDPREFIX
if (j==12 && !memcmp(ip,V4mappedprefix,12)) {
inet_ntoa_r(*(struct in_addr*)(ip+12),s);
temp=strlen(s);
return len+temp;
}
#endif
temp = ((unsigned long) (unsigned char) ip[j] << 8) +
(unsigned long) (unsigned char) ip[j+1];
if (temp == 0) {
if (!compressing) {
compressing=1;
if (j==0) {
*s++=':'; ++len;
}
}
} else {
if (compressing) {
compressing=0;
*s++=':'; ++len;
}
i = fmt_xlong(s,temp); len += i; s += i;
if (j<14) {
*s++ = ':';
++len;
}
}
}
if (compressing) {
*s++=':'; ++len;
}
*s=0;
return len;
}
static struct sk_buff *fill_packet_ipv6(struct net_device *odev,
struct pktgen_dev *pkt_dev)
{
struct sk_buff *skb = NULL;
__u8 *eth;
struct udphdr *udph;
int datalen;
struct ipv6hdr *iph;
struct pktgen_hdr *pgh = NULL;
/* Update any of the values, used when we're incrementing various
* fields.
*/
mod_cur_headers(pkt_dev);
skb = alloc_skb(pkt_dev->cur_pkt_size + 64 + 16, GFP_ATOMIC);
if (!skb) {
sprintf(pkt_dev->result, "No memory");
return NULL;
}
skb_reserve(skb, 16);
/* Reserve for ethernet and IP header */
eth = (__u8 *) skb_push(skb, 14);
iph = (struct ipv6hdr *)skb_put(skb, sizeof(struct ipv6hdr));
udph = (struct udphdr *)skb_put(skb, sizeof(struct udphdr));
memcpy(eth, pkt_dev->hh, 12);
*(u16*)&eth[12] = __constant_htons(ETH_P_IPV6);
datalen = pkt_dev->cur_pkt_size-14-
sizeof(struct ipv6hdr)-sizeof(struct udphdr); /* Eth + IPh + UDPh */
if (datalen < sizeof(struct pktgen_hdr)) {
datalen = sizeof(struct pktgen_hdr);
if (net_ratelimit())
printk(KERN_INFO "pktgen: increased datalen to %d\n", datalen);
}
udph->source = htons(pkt_dev->cur_udp_src);
udph->dest = htons(pkt_dev->cur_udp_dst);
udph->len = htons(datalen + sizeof(struct udphdr));
udph->check = 0; /* No checksum */
*(u32*)iph = __constant_htonl(0x60000000); /* Version + flow */
iph->hop_limit = 32;
iph->payload_len = htons(sizeof(struct udphdr) + datalen);
iph->nexthdr = IPPROTO_UDP;
ipv6_addr_copy(&iph->daddr, &pkt_dev->cur_in6_daddr);
ipv6_addr_copy(&iph->saddr, &pkt_dev->cur_in6_saddr);
skb->mac.raw = ((u8 *)iph) - 14;
skb->protocol = __constant_htons(ETH_P_IPV6);
skb->dev = odev;
skb->pkt_type = PACKET_HOST;
if (pkt_dev->nfrags <= 0)
pgh = (struct pktgen_hdr *)skb_put(skb, datalen);
else {
int frags = pkt_dev->nfrags;
int i;
pgh = (struct pktgen_hdr*)(((char*)(udph)) + 8);
if (frags > MAX_SKB_FRAGS)
frags = MAX_SKB_FRAGS;
if (datalen > frags*PAGE_SIZE) {
skb_put(skb, datalen-frags*PAGE_SIZE);
datalen = frags*PAGE_SIZE;
}
i = 0;
while (datalen > 0) {
struct page *page = alloc_pages(GFP_KERNEL, 0);
skb_shinfo(skb)->frags[i].page = page;
skb_shinfo(skb)->frags[i].page_offset = 0;
skb_shinfo(skb)->frags[i].size =
(datalen < PAGE_SIZE ? datalen : PAGE_SIZE);
datalen -= skb_shinfo(skb)->frags[i].size;
skb->len += skb_shinfo(skb)->frags[i].size;
skb->data_len += skb_shinfo(skb)->frags[i].size;
i++;
skb_shinfo(skb)->nr_frags = i;
}
while (i < frags) {
int rem;
if (i == 0)
break;
rem = skb_shinfo(skb)->frags[i - 1].size / 2;
if (rem == 0)
break;
skb_shinfo(skb)->frags[i - 1].size -= rem;
skb_shinfo(skb)->frags[i] = skb_shinfo(skb)->frags[i - 1];
get_page(skb_shinfo(skb)->frags[i].page);
skb_shinfo(skb)->frags[i].page = skb_shinfo(skb)->frags[i - 1].page;
skb_shinfo(skb)->frags[i].page_offset += skb_shinfo(skb)->frags[i - 1].size;
skb_shinfo(skb)->frags[i].size = rem;
i++;
skb_shinfo(skb)->nr_frags = i;
}
}
/* Stamp the time, and sequence number, convert them to network byte order */
/* should we update cloned packets too ? */
if (pgh) {
struct timeval timestamp;
pgh->pgh_magic = htonl(PKTGEN_MAGIC);
pgh->seq_num = htonl(pkt_dev->seq_num);
do_gettimeofday(&timestamp);
pgh->tv_sec = htonl(timestamp.tv_sec);
pgh->tv_usec = htonl(timestamp.tv_usec);
}
pkt_dev->seq_num++;
return skb;
}
static inline struct sk_buff *fill_packet(struct net_device *odev,
struct pktgen_dev *pkt_dev)
{
if(pkt_dev->flags & F_IPV6)
return fill_packet_ipv6(odev, pkt_dev);
else
return fill_packet_ipv4(odev, pkt_dev);
}
static void pktgen_clear_counters(struct pktgen_dev *pkt_dev)
{
pkt_dev->seq_num = 1;
pkt_dev->idle_acc = 0;
pkt_dev->sofar = 0;
pkt_dev->tx_bytes = 0;
pkt_dev->errors = 0;
}
/* Set up structure for sending pkts, clear counters */
static void pktgen_run(struct pktgen_thread *t)
{
struct pktgen_dev *pkt_dev = NULL;
int started = 0;
PG_DEBUG(printk("pktgen: entering pktgen_run. %p\n", t));
if_lock(t);
for (pkt_dev = t->if_list; pkt_dev; pkt_dev = pkt_dev->next ) {
/*
* setup odev and create initial packet.
*/
pktgen_setup_inject(pkt_dev);
if(pkt_dev->odev) {
pktgen_clear_counters(pkt_dev);
pkt_dev->running = 1; /* Cranke yeself! */
pkt_dev->skb = NULL;
pkt_dev->started_at = getCurUs();
pkt_dev->next_tx_us = getCurUs(); /* Transmit immediately */
pkt_dev->next_tx_ns = 0;
strcpy(pkt_dev->result, "Starting");
started++;
}
else
strcpy(pkt_dev->result, "Error starting");
}
if_unlock(t);
if(started) t->control &= ~(T_STOP);
}
static void pktgen_stop_all_threads_ifs(void)
{
struct pktgen_thread *t = pktgen_threads;
PG_DEBUG(printk("pktgen: entering pktgen_stop_all_threads.\n"));
thread_lock();
while(t) {
pktgen_stop(t);
t = t->next;
}
thread_unlock();
}
static int thread_is_running(struct pktgen_thread *t )
{
struct pktgen_dev *next;
int res = 0;
for(next=t->if_list; next; next=next->next) {
if(next->running) {
res = 1;
break;
}
}
return res;
}
static int pktgen_wait_thread_run(struct pktgen_thread *t )
{
if_lock(t);
while(thread_is_running(t)) {
if_unlock(t);
msleep_interruptible(100);
if (signal_pending(current))
goto signal;
if_lock(t);
}
if_unlock(t);
return 1;
signal:
return 0;
}
static int pktgen_wait_all_threads_run(void)
{
struct pktgen_thread *t = pktgen_threads;
int sig = 1;
while (t) {
sig = pktgen_wait_thread_run(t);
if( sig == 0 ) break;
thread_lock();
t=t->next;
thread_unlock();
}
if(sig == 0) {
thread_lock();
while (t) {
t->control |= (T_STOP);
t=t->next;
}
thread_unlock();
}
return sig;
}
static void pktgen_run_all_threads(void)
{
struct pktgen_thread *t = pktgen_threads;
PG_DEBUG(printk("pktgen: entering pktgen_run_all_threads.\n"));
thread_lock();
while(t) {
t->control |= (T_RUN);
t = t->next;
}
thread_unlock();
schedule_timeout_interruptible(msecs_to_jiffies(125)); /* Propagate thread->control */
pktgen_wait_all_threads_run();
}
static void show_results(struct pktgen_dev *pkt_dev, int nr_frags)
{
__u64 total_us, bps, mbps, pps, idle;
char *p = pkt_dev->result;
total_us = pkt_dev->stopped_at - pkt_dev->started_at;
idle = pkt_dev->idle_acc;
p += sprintf(p, "OK: %llu(c%llu+d%llu) usec, %llu (%dbyte,%dfrags)\n",
(unsigned long long) total_us,
(unsigned long long)(total_us - idle),
(unsigned long long) idle,
(unsigned long long) pkt_dev->sofar,
pkt_dev->cur_pkt_size, nr_frags);
pps = pkt_dev->sofar * USEC_PER_SEC;
while ((total_us >> 32) != 0) {
pps >>= 1;
total_us >>= 1;
}
do_div(pps, total_us);
bps = pps * 8 * pkt_dev->cur_pkt_size;
mbps = bps;
do_div(mbps, 1000000);
p += sprintf(p, " %llupps %lluMb/sec (%llubps) errors: %llu",
(unsigned long long) pps,
(unsigned long long) mbps,
(unsigned long long) bps,
(unsigned long long) pkt_dev->errors);
}
/* Set stopped-at timer, remove from running list, do counters & statistics */
static int pktgen_stop_device(struct pktgen_dev *pkt_dev)
{
if (!pkt_dev->running) {
printk("pktgen: interface: %s is already stopped\n", pkt_dev->ifname);
return -EINVAL;
}
pkt_dev->stopped_at = getCurUs();
pkt_dev->running = 0;
show_results(pkt_dev, skb_shinfo(pkt_dev->skb)->nr_frags);
if (pkt_dev->skb)
kfree_skb(pkt_dev->skb);
pkt_dev->skb = NULL;
return 0;
}
static struct pktgen_dev *next_to_run(struct pktgen_thread *t )
{
struct pktgen_dev *next, *best = NULL;
if_lock(t);
for(next=t->if_list; next ; next=next->next) {
if(!next->running) continue;
if(best == NULL) best=next;
else if ( next->next_tx_us < best->next_tx_us)
best = next;
}
if_unlock(t);
return best;
}
static void pktgen_stop(struct pktgen_thread *t) {
struct pktgen_dev *next = NULL;
PG_DEBUG(printk("pktgen: entering pktgen_stop.\n"));
if_lock(t);
for(next=t->if_list; next; next=next->next)
pktgen_stop_device(next);
if_unlock(t);
}
static void pktgen_rem_all_ifs(struct pktgen_thread *t)
{
struct pktgen_dev *cur, *next = NULL;
/* Remove all devices, free mem */
if_lock(t);
for(cur=t->if_list; cur; cur=next) {
next = cur->next;
pktgen_remove_device(t, cur);
}
if_unlock(t);
}
static void pktgen_rem_thread(struct pktgen_thread *t)
{
/* Remove from the thread list */
struct pktgen_thread *tmp = pktgen_threads;
if (strlen(t->fname))
remove_proc_entry(t->fname, NULL);
thread_lock();
if (tmp == t)
pktgen_threads = tmp->next;
else {
while (tmp) {
if (tmp->next == t) {
tmp->next = t->next;
t->next = NULL;
break;
}
tmp = tmp->next;
}
}
thread_unlock();
}
static __inline__ void pktgen_xmit(struct pktgen_dev *pkt_dev)
{
struct net_device *odev = NULL;
__u64 idle_start = 0;
int ret;
odev = pkt_dev->odev;
if (pkt_dev->delay_us || pkt_dev->delay_ns) {
u64 now;
now = getCurUs();
if (now < pkt_dev->next_tx_us)
spin(pkt_dev, pkt_dev->next_tx_us);
/* This is max DELAY, this has special meaning of
* "never transmit"
*/
if (pkt_dev->delay_us == 0x7FFFFFFF) {
pkt_dev->next_tx_us = getCurUs() + pkt_dev->delay_us;
pkt_dev->next_tx_ns = pkt_dev->delay_ns;
goto out;
}
}
if (netif_queue_stopped(odev) || need_resched()) {
idle_start = getCurUs();
if (!netif_running(odev)) {
pktgen_stop_device(pkt_dev);
goto out;
}
if (need_resched())
schedule();
pkt_dev->idle_acc += getCurUs() - idle_start;
if (netif_queue_stopped(odev)) {
pkt_dev->next_tx_us = getCurUs(); /* TODO */
pkt_dev->next_tx_ns = 0;
goto out; /* Try the next interface */
}
}
if (pkt_dev->last_ok || !pkt_dev->skb) {
if ((++pkt_dev->clone_count >= pkt_dev->clone_skb ) || (!pkt_dev->skb)) {
/* build a new pkt */
if (pkt_dev->skb)
kfree_skb(pkt_dev->skb);
pkt_dev->skb = fill_packet(odev, pkt_dev);
if (pkt_dev->skb == NULL) {
printk("pktgen: ERROR: couldn't allocate skb in fill_packet.\n");
schedule();
pkt_dev->clone_count--; /* back out increment, OOM */
goto out;
}
pkt_dev->allocated_skbs++;
pkt_dev->clone_count = 0; /* reset counter */
}
}
spin_lock_bh(&odev->xmit_lock);
if (!netif_queue_stopped(odev)) {
atomic_inc(&(pkt_dev->skb->users));
retry_now:
ret = odev->hard_start_xmit(pkt_dev->skb, odev);
if (likely(ret == NETDEV_TX_OK)) {
pkt_dev->last_ok = 1;
pkt_dev->sofar++;
pkt_dev->seq_num++;
pkt_dev->tx_bytes += pkt_dev->cur_pkt_size;
} else if (ret == NETDEV_TX_LOCKED
&& (odev->features & NETIF_F_LLTX)) {
cpu_relax();
goto retry_now;
} else { /* Retry it next time */
atomic_dec(&(pkt_dev->skb->users));
if (debug && net_ratelimit())
printk(KERN_INFO "pktgen: Hard xmit error\n");
pkt_dev->errors++;
pkt_dev->last_ok = 0;
}
pkt_dev->next_tx_us = getCurUs();
pkt_dev->next_tx_ns = 0;
pkt_dev->next_tx_us += pkt_dev->delay_us;
pkt_dev->next_tx_ns += pkt_dev->delay_ns;
if (pkt_dev->next_tx_ns > 1000) {
pkt_dev->next_tx_us++;
pkt_dev->next_tx_ns -= 1000;
}
}
else { /* Retry it next time */
pkt_dev->last_ok = 0;
pkt_dev->next_tx_us = getCurUs(); /* TODO */
pkt_dev->next_tx_ns = 0;
}
spin_unlock_bh(&odev->xmit_lock);
/* If pkt_dev->count is zero, then run forever */
if ((pkt_dev->count != 0) && (pkt_dev->sofar >= pkt_dev->count)) {
if (atomic_read(&(pkt_dev->skb->users)) != 1) {
idle_start = getCurUs();
while (atomic_read(&(pkt_dev->skb->users)) != 1) {
if (signal_pending(current)) {
break;
}
schedule();
}
pkt_dev->idle_acc += getCurUs() - idle_start;
}
/* Done with this */
pktgen_stop_device(pkt_dev);
}
out:;
}
/*
* Main loop of the thread goes here
*/
static void pktgen_thread_worker(struct pktgen_thread *t)
{
DEFINE_WAIT(wait);
struct pktgen_dev *pkt_dev = NULL;
int cpu = t->cpu;
sigset_t tmpsig;
u32 max_before_softirq;
u32 tx_since_softirq = 0;
daemonize("pktgen/%d", cpu);
/* Block all signals except SIGKILL, SIGSTOP and SIGTERM */
spin_lock_irq(&current->sighand->siglock);
tmpsig = current->blocked;
siginitsetinv(&current->blocked,
sigmask(SIGKILL) |
sigmask(SIGSTOP)|
sigmask(SIGTERM));
recalc_sigpending();
spin_unlock_irq(&current->sighand->siglock);
/* Migrate to the right CPU */
set_cpus_allowed(current, cpumask_of_cpu(cpu));
if (smp_processor_id() != cpu)
BUG();
init_waitqueue_head(&t->queue);
t->control &= ~(T_TERMINATE);
t->control &= ~(T_RUN);
t->control &= ~(T_STOP);
t->control &= ~(T_REMDEV);
t->pid = current->pid;
PG_DEBUG(printk("pktgen: starting pktgen/%d: pid=%d\n", cpu, current->pid));
max_before_softirq = t->max_before_softirq;
__set_current_state(TASK_INTERRUPTIBLE);
mb();
while (1) {
__set_current_state(TASK_RUNNING);
/*
* Get next dev to xmit -- if any.
*/
pkt_dev = next_to_run(t);
if (pkt_dev) {
pktgen_xmit(pkt_dev);
/*
* We like to stay RUNNING but must also give
* others fair share.
*/
tx_since_softirq += pkt_dev->last_ok;
if (tx_since_softirq > max_before_softirq) {
if (local_softirq_pending())
do_softirq();
tx_since_softirq = 0;
}
} else {
prepare_to_wait(&(t->queue), &wait, TASK_INTERRUPTIBLE);
schedule_timeout(HZ/10);
finish_wait(&(t->queue), &wait);
}
/*
* Back from sleep, either due to the timeout or signal.
* We check if we have any "posted" work for us.
*/
if (t->control & T_TERMINATE || signal_pending(current))
/* we received a request to terminate ourself */
break;
if(t->control & T_STOP) {
pktgen_stop(t);
t->control &= ~(T_STOP);
}
if(t->control & T_RUN) {
pktgen_run(t);
t->control &= ~(T_RUN);
}
if(t->control & T_REMDEV) {
pktgen_rem_all_ifs(t);
t->control &= ~(T_REMDEV);
}
if (need_resched())
schedule();
}
PG_DEBUG(printk("pktgen: %s stopping all device\n", t->name));
pktgen_stop(t);
PG_DEBUG(printk("pktgen: %s removing all device\n", t->name));
pktgen_rem_all_ifs(t);
PG_DEBUG(printk("pktgen: %s removing thread.\n", t->name));
pktgen_rem_thread(t);
}
static struct pktgen_dev *pktgen_find_dev(struct pktgen_thread *t, const char* ifname)
{
struct pktgen_dev *pkt_dev = NULL;
if_lock(t);
for(pkt_dev=t->if_list; pkt_dev; pkt_dev = pkt_dev->next ) {
if (strcmp(pkt_dev->ifname, ifname) == 0) {
break;
}
}
if_unlock(t);
PG_DEBUG(printk("pktgen: find_dev(%s) returning %p\n", ifname,pkt_dev));
return pkt_dev;
}
/*
* Adds a dev at front of if_list.
*/
static int add_dev_to_thread(struct pktgen_thread *t, struct pktgen_dev *pkt_dev)
{
int rv = 0;
if_lock(t);
if (pkt_dev->pg_thread) {
printk("pktgen: ERROR: already assigned to a thread.\n");
rv = -EBUSY;
goto out;
}
pkt_dev->next =t->if_list; t->if_list=pkt_dev;
pkt_dev->pg_thread = t;
pkt_dev->running = 0;
out:
if_unlock(t);
return rv;
}
/* Called under thread lock */
static int pktgen_add_device(struct pktgen_thread *t, const char* ifname)
{
struct pktgen_dev *pkt_dev;
/* We don't allow a device to be on several threads */
if( (pkt_dev = __pktgen_NN_threads(ifname, FIND)) == NULL) {
pkt_dev = kmalloc(sizeof(struct pktgen_dev), GFP_KERNEL);
if (!pkt_dev)
return -ENOMEM;
memset(pkt_dev, 0, sizeof(struct pktgen_dev));
pkt_dev->flows = vmalloc(MAX_CFLOWS*sizeof(struct flow_state));
if (pkt_dev->flows == NULL) {
kfree(pkt_dev);
return -ENOMEM;
}
memset(pkt_dev->flows, 0, MAX_CFLOWS*sizeof(struct flow_state));
pkt_dev->min_pkt_size = ETH_ZLEN;
pkt_dev->max_pkt_size = ETH_ZLEN;
pkt_dev->nfrags = 0;
pkt_dev->clone_skb = pg_clone_skb_d;
pkt_dev->delay_us = pg_delay_d / 1000;
pkt_dev->delay_ns = pg_delay_d % 1000;
pkt_dev->count = pg_count_d;
pkt_dev->sofar = 0;
pkt_dev->udp_src_min = 9; /* sink port */
pkt_dev->udp_src_max = 9;
pkt_dev->udp_dst_min = 9;
pkt_dev->udp_dst_max = 9;
strncpy(pkt_dev->ifname, ifname, 31);
sprintf(pkt_dev->fname, "%s/%s", PG_PROC_DIR, ifname);
if (! pktgen_setup_dev(pkt_dev)) {
printk("pktgen: ERROR: pktgen_setup_dev failed.\n");
if (pkt_dev->flows)
vfree(pkt_dev->flows);
kfree(pkt_dev);
return -ENODEV;
}
pkt_dev->proc_ent = create_proc_entry(pkt_dev->fname, 0600, NULL);
if (!pkt_dev->proc_ent) {
printk("pktgen: cannot create %s procfs entry.\n", pkt_dev->fname);
if (pkt_dev->flows)
vfree(pkt_dev->flows);
kfree(pkt_dev);
return -EINVAL;
}
pkt_dev->proc_ent->read_proc = proc_if_read;
pkt_dev->proc_ent->write_proc = proc_if_write;
pkt_dev->proc_ent->data = (void*)(pkt_dev);
pkt_dev->proc_ent->owner = THIS_MODULE;
return add_dev_to_thread(t, pkt_dev);
}
else {
printk("pktgen: ERROR: interface already used.\n");
return -EBUSY;
}
}
static struct pktgen_thread *pktgen_find_thread(const char* name)
{
struct pktgen_thread *t = NULL;
thread_lock();
t = pktgen_threads;
while (t) {
if (strcmp(t->name, name) == 0)
break;
t = t->next;
}
thread_unlock();
return t;
}
static int pktgen_create_thread(const char* name, int cpu)
{
struct pktgen_thread *t = NULL;
if (strlen(name) > 31) {
printk("pktgen: ERROR: Thread name cannot be more than 31 characters.\n");
return -EINVAL;
}
if (pktgen_find_thread(name)) {
printk("pktgen: ERROR: thread: %s already exists\n", name);
return -EINVAL;
}
t = (struct pktgen_thread*)(kmalloc(sizeof(struct pktgen_thread), GFP_KERNEL));
if (!t) {
printk("pktgen: ERROR: out of memory, can't create new thread.\n");
return -ENOMEM;
}
memset(t, 0, sizeof(struct pktgen_thread));
strcpy(t->name, name);
spin_lock_init(&t->if_lock);
t->cpu = cpu;
sprintf(t->fname, "%s/%s", PG_PROC_DIR, t->name);
t->proc_ent = create_proc_entry(t->fname, 0600, NULL);
if (!t->proc_ent) {
printk("pktgen: cannot create %s procfs entry.\n", t->fname);
kfree(t);
return -EINVAL;
}
t->proc_ent->read_proc = proc_thread_read;
t->proc_ent->write_proc = proc_thread_write;
t->proc_ent->data = (void*)(t);
t->proc_ent->owner = THIS_MODULE;
t->next = pktgen_threads;
pktgen_threads = t;
if (kernel_thread((void *) pktgen_thread_worker, (void *) t,
CLONE_FS | CLONE_FILES | CLONE_SIGHAND) < 0)
printk("pktgen: kernel_thread() failed for cpu %d\n", t->cpu);
return 0;
}
/*
* Removes a device from the thread if_list.
*/
static void _rem_dev_from_if_list(struct pktgen_thread *t, struct pktgen_dev *pkt_dev)
{
struct pktgen_dev *i, *prev = NULL;
i = t->if_list;
while(i) {
if(i == pkt_dev) {
if(prev) prev->next = i->next;
else t->if_list = NULL;
break;
}
prev = i;
i=i->next;
}
}
static int pktgen_remove_device(struct pktgen_thread *t, struct pktgen_dev *pkt_dev)
{
PG_DEBUG(printk("pktgen: remove_device pkt_dev=%p\n", pkt_dev));
if (pkt_dev->running) {
printk("pktgen:WARNING: trying to remove a running interface, stopping it now.\n");
pktgen_stop_device(pkt_dev);
}
/* Dis-associate from the interface */
if (pkt_dev->odev) {
dev_put(pkt_dev->odev);
pkt_dev->odev = NULL;
}
/* And update the thread if_list */
_rem_dev_from_if_list(t, pkt_dev);
/* Clean up proc file system */
if (strlen(pkt_dev->fname))
remove_proc_entry(pkt_dev->fname, NULL);
if (pkt_dev->flows)
vfree(pkt_dev->flows);
kfree(pkt_dev);
return 0;
}
static int __init pg_init(void)
{
int cpu;
printk(version);
module_fname[0] = 0;
create_proc_dir();
sprintf(module_fname, "%s/pgctrl", PG_PROC_DIR);
module_proc_ent = create_proc_entry(module_fname, 0600, NULL);
if (!module_proc_ent) {
printk("pktgen: ERROR: cannot create %s procfs entry.\n", module_fname);
return -EINVAL;
}
module_proc_ent->proc_fops = &pktgen_fops;
module_proc_ent->data = NULL;
/* Register us to receive netdevice events */
register_netdevice_notifier(&pktgen_notifier_block);
for_each_online_cpu(cpu) {
char buf[30];
sprintf(buf, "kpktgend_%i", cpu);
pktgen_create_thread(buf, cpu);
}
return 0;
}
static void __exit pg_cleanup(void)
{
wait_queue_head_t queue;
init_waitqueue_head(&queue);
/* Stop all interfaces & threads */
while (pktgen_threads) {
struct pktgen_thread *t = pktgen_threads;
pktgen_threads->control |= (T_TERMINATE);
wait_event_interruptible_timeout(queue, (t != pktgen_threads), HZ);
}
/* Un-register us from receiving netdevice events */
unregister_netdevice_notifier(&pktgen_notifier_block);
/* Clean up proc file system */
remove_proc_entry(module_fname, NULL);
remove_proc_dir();
}
module_init(pg_init);
module_exit(pg_cleanup);
MODULE_AUTHOR("Robert Olsson <robert.olsson@its.uu.se");
MODULE_DESCRIPTION("Packet Generator tool");
MODULE_LICENSE("GPL");
module_param(pg_count_d, int, 0);
module_param(pg_delay_d, int, 0);
module_param(pg_clone_skb_d, int, 0);
module_param(debug, int, 0);
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