1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Authors:
4 * Copyright 2001, 2002 by Robert Olsson <robert.olsson@its.uu.se>
5 * Uppsala University and
6 * Swedish University of Agricultural Sciences
7 *
8 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
9 * Ben Greear <greearb@candelatech.com>
10 * Jens Låås <jens.laas@data.slu.se>
11 *
12 * A tool for loading the network with preconfigurated packets.
13 * The tool is implemented as a linux module. Parameters are output
14 * device, delay (to hard_xmit), number of packets, and whether
15 * to use multiple SKBs or just the same one.
16 * pktgen uses the installed interface's output routine.
17 *
18 * Additional hacking by:
19 *
20 * Jens.Laas@data.slu.se
21 * Improved by ANK. 010120.
22 * Improved by ANK even more. 010212.
23 * MAC address typo fixed. 010417 --ro
24 * Integrated. 020301 --DaveM
25 * Added multiskb option 020301 --DaveM
26 * Scaling of results. 020417--sigurdur@linpro.no
27 * Significant re-work of the module:
28 * * Convert to threaded model to more efficiently be able to transmit
29 * and receive on multiple interfaces at once.
30 * * Converted many counters to __u64 to allow longer runs.
31 * * Allow configuration of ranges, like min/max IP address, MACs,
32 * and UDP-ports, for both source and destination, and can
33 * set to use a random distribution or sequentially walk the range.
34 * * Can now change most values after starting.
35 * * Place 12-byte packet in UDP payload with magic number,
36 * sequence number, and timestamp.
37 * * Add receiver code that detects dropped pkts, re-ordered pkts, and
38 * latencies (with micro-second) precision.
39 * * Add IOCTL interface to easily get counters & configuration.
40 * --Ben Greear <greearb@candelatech.com>
41 *
42 * Renamed multiskb to clone_skb and cleaned up sending core for two distinct
43 * skb modes. A clone_skb=0 mode for Ben "ranges" work and a clone_skb != 0
44 * as a "fastpath" with a configurable number of clones after alloc's.
45 * clone_skb=0 means all packets are allocated this also means ranges time
46 * stamps etc can be used. clone_skb=100 means 1 malloc is followed by 100
47 * clones.
48 *
49 * Also moved to /proc/net/pktgen/
50 * --ro
51 *
52 * Sept 10: Fixed threading/locking. Lots of bone-headed and more clever
53 * mistakes. Also merged in DaveM's patch in the -pre6 patch.
54 * --Ben Greear <greearb@candelatech.com>
55 *
56 * Integrated to 2.5.x 021029 --Lucio Maciel (luciomaciel@zipmail.com.br)
57 *
58 * 021124 Finished major redesign and rewrite for new functionality.
59 * See Documentation/networking/pktgen.rst for how to use this.
60 *
61 * The new operation:
62 * For each CPU one thread/process is created at start. This process checks
63 * for running devices in the if_list and sends packets until count is 0 it
64 * also the thread checks the thread->control which is used for inter-process
65 * communication. controlling process "posts" operations to the threads this
66 * way.
67 * The if_list is RCU protected, and the if_lock remains to protect updating
68 * of if_list, from "add_device" as it invoked from userspace (via proc write).
69 *
70 * By design there should only be *one* "controlling" process. In practice
71 * multiple write accesses gives unpredictable result. Understood by "write"
72 * to /proc gives result code thats should be read be the "writer".
73 * For practical use this should be no problem.
74 *
75 * Note when adding devices to a specific CPU there good idea to also assign
76 * /proc/irq/XX/smp_affinity so TX-interrupts gets bound to the same CPU.
77 * --ro
78 *
79 * Fix refcount off by one if first packet fails, potential null deref,
80 * memleak 030710- KJP
81 *
82 * First "ranges" functionality for ipv6 030726 --ro
83 *
84 * Included flow support. 030802 ANK.
85 *
86 * Fixed unaligned access on IA-64 Grant Grundler <grundler@parisc-linux.org>
87 *
88 * Remove if fix from added Harald Welte <laforge@netfilter.org> 040419
89 * ia64 compilation fix from Aron Griffis <aron@hp.com> 040604
90 *
91 * New xmit() return, do_div and misc clean up by Stephen Hemminger
92 * <shemminger@osdl.org> 040923
93 *
94 * Randy Dunlap fixed u64 printk compiler warning
95 *
96 * Remove FCS from BW calculation. Lennert Buytenhek <buytenh@wantstofly.org>
97 * New time handling. Lennert Buytenhek <buytenh@wantstofly.org> 041213
98 *
99 * Corrections from Nikolai Malykh (nmalykh@bilim.com)
100 * Removed unused flags F_SET_SRCMAC & F_SET_SRCIP 041230
101 *
102 * interruptible_sleep_on_timeout() replaced Nishanth Aravamudan <nacc@us.ibm.com>
103 * 050103
104 *
105 * MPLS support by Steven Whitehouse <steve@chygwyn.com>
106 *
107 * 802.1Q/Q-in-Q support by Francesco Fondelli (FF) <francesco.fondelli@gmail.com>
108 *
109 * Fixed src_mac command to set source mac of packet to value specified in
110 * command by Adit Ranadive <adit.262@gmail.com>
111 */
112
113 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
114
115 #include <linux/sys.h>
116 #include <linux/types.h>
117 #include <linux/module.h>
118 #include <linux/moduleparam.h>
119 #include <linux/kernel.h>
120 #include <linux/mutex.h>
121 #include <linux/sched.h>
122 #include <linux/slab.h>
123 #include <linux/vmalloc.h>
124 #include <linux/unistd.h>
125 #include <linux/string.h>
126 #include <linux/ptrace.h>
127 #include <linux/errno.h>
128 #include <linux/ioport.h>
129 #include <linux/interrupt.h>
130 #include <linux/capability.h>
131 #include <linux/hrtimer.h>
132 #include <linux/freezer.h>
133 #include <linux/delay.h>
134 #include <linux/timer.h>
135 #include <linux/list.h>
136 #include <linux/init.h>
137 #include <linux/skbuff.h>
138 #include <linux/netdevice.h>
139 #include <linux/inet.h>
140 #include <linux/inetdevice.h>
141 #include <linux/rtnetlink.h>
142 #include <linux/if_arp.h>
143 #include <linux/if_vlan.h>
144 #include <linux/in.h>
145 #include <linux/ip.h>
146 #include <linux/ipv6.h>
147 #include <linux/udp.h>
148 #include <linux/proc_fs.h>
149 #include <linux/seq_file.h>
150 #include <linux/wait.h>
151 #include <linux/etherdevice.h>
152 #include <linux/kthread.h>
153 #include <linux/prefetch.h>
154 #include <linux/mmzone.h>
155 #include <net/net_namespace.h>
156 #include <net/checksum.h>
157 #include <net/ipv6.h>
158 #include <net/udp.h>
159 #include <net/ip6_checksum.h>
160 #include <net/addrconf.h>
161 #ifdef CONFIG_XFRM
162 #include <net/xfrm.h>
163 #endif
164 #include <net/netns/generic.h>
165 #include <asm/byteorder.h>
166 #include <linux/rcupdate.h>
167 #include <linux/bitops.h>
168 #include <linux/io.h>
169 #include <linux/timex.h>
170 #include <linux/uaccess.h>
171 #include <asm/dma.h>
172 #include <asm/div64.h> /* do_div */
173
174 #define VERSION "2.75"
175 #define IP_NAME_SZ 32
176 #define MAX_MPLS_LABELS 16 /* This is the max label stack depth */
177 #define MPLS_STACK_BOTTOM htonl(0x00000100)
178 /* Max number of internet mix entries that can be specified in imix_weights. */
179 #define MAX_IMIX_ENTRIES 20
180 #define IMIX_PRECISION 100 /* Precision of IMIX distribution */
181
182 #define func_enter() pr_debug("entering %s\n", __func__);
183
184 #define PKT_FLAGS \
185 pf(IPV6) /* Interface in IPV6 Mode */ \
186 pf(IPSRC_RND) /* IP-Src Random */ \
187 pf(IPDST_RND) /* IP-Dst Random */ \
188 pf(TXSIZE_RND) /* Transmit size is random */ \
189 pf(UDPSRC_RND) /* UDP-Src Random */ \
190 pf(UDPDST_RND) /* UDP-Dst Random */ \
191 pf(UDPCSUM) /* Include UDP checksum */ \
192 pf(NO_TIMESTAMP) /* Don't timestamp packets (default TS) */ \
193 pf(MPLS_RND) /* Random MPLS labels */ \
194 pf(QUEUE_MAP_RND) /* queue map Random */ \
195 pf(QUEUE_MAP_CPU) /* queue map mirrors smp_processor_id() */ \
196 pf(FLOW_SEQ) /* Sequential flows */ \
197 pf(IPSEC) /* ipsec on for flows */ \
198 pf(MACSRC_RND) /* MAC-Src Random */ \
199 pf(MACDST_RND) /* MAC-Dst Random */ \
200 pf(VID_RND) /* Random VLAN ID */ \
201 pf(SVID_RND) /* Random SVLAN ID */ \
202 pf(NODE) /* Node memory alloc*/ \
203
204 #define pf(flag) flag##_SHIFT,
205 enum pkt_flags {
206 PKT_FLAGS
207 };
208 #undef pf
209
210 /* Device flag bits */
211 #define pf(flag) static const __u32 F_##flag = (1<<flag##_SHIFT);
212 PKT_FLAGS
213 #undef pf
214
215 #define pf(flag) __stringify(flag),
216 static char *pkt_flag_names[] = {
217 PKT_FLAGS
218 };
219 #undef pf
220
221 #define NR_PKT_FLAGS ARRAY_SIZE(pkt_flag_names)
222
223 /* Thread control flag bits */
224 #define T_STOP (1<<0) /* Stop run */
225 #define T_RUN (1<<1) /* Start run */
226 #define T_REMDEVALL (1<<2) /* Remove all devs */
227 #define T_REMDEV (1<<3) /* Remove one dev */
228
229 /* Xmit modes */
230 #define M_START_XMIT 0 /* Default normal TX */
231 #define M_NETIF_RECEIVE 1 /* Inject packets into stack */
232 #define M_QUEUE_XMIT 2 /* Inject packet into qdisc */
233
234 /* If lock -- protects updating of if_list */
235 #define if_lock(t) mutex_lock(&(t->if_lock));
236 #define if_unlock(t) mutex_unlock(&(t->if_lock));
237
238 /* Used to help with determining the pkts on receive */
239 #define PKTGEN_MAGIC 0xbe9be955
240 #define PG_PROC_DIR "pktgen"
241 #define PGCTRL "pgctrl"
242
243 #define MAX_CFLOWS 65536
244
245 #define VLAN_TAG_SIZE(x) ((x)->vlan_id == 0xffff ? 0 : 4)
246 #define SVLAN_TAG_SIZE(x) ((x)->svlan_id == 0xffff ? 0 : 4)
247
248 struct imix_pkt {
249 u64 size;
250 u64 weight;
251 u64 count_so_far;
252 };
253
254 struct flow_state {
255 __be32 cur_daddr;
256 int count;
257 #ifdef CONFIG_XFRM
258 struct xfrm_state *x;
259 #endif
260 __u32 flags;
261 };
262
263 /* flow flag bits */
264 #define F_INIT (1<<0) /* flow has been initialized */
265
266 struct pktgen_dev {
267 /*
268 * Try to keep frequent/infrequent used vars. separated.
269 */
270 struct proc_dir_entry *entry; /* proc file */
271 struct pktgen_thread *pg_thread;/* the owner */
272 struct list_head list; /* chaining in the thread's run-queue */
273 struct rcu_head rcu; /* freed by RCU */
274
275 int running; /* if false, the test will stop */
276
277 /* If min != max, then we will either do a linear iteration, or
278 * we will do a random selection from within the range.
279 */
280 __u32 flags;
281 int xmit_mode;
282 int min_pkt_size;
283 int max_pkt_size;
284 int pkt_overhead; /* overhead for MPLS, VLANs, IPSEC etc */
285 int nfrags;
286 int removal_mark; /* non-zero => the device is marked for
287 * removal by worker thread */
288
289 struct page *page;
290 u64 delay; /* nano-seconds */
291
292 __u64 count; /* Default No packets to send */
293 __u64 sofar; /* How many pkts we've sent so far */
294 __u64 tx_bytes; /* How many bytes we've transmitted */
295 __u64 errors; /* Errors when trying to transmit, */
296
297 /* runtime counters relating to clone_skb */
298
299 __u32 clone_count;
300 int last_ok; /* Was last skb sent?
301 * Or a failed transmit of some sort?
302 * This will keep sequence numbers in order
303 */
304 ktime_t next_tx;
305 ktime_t started_at;
306 ktime_t stopped_at;
307 u64 idle_acc; /* nano-seconds */
308
309 __u32 seq_num;
310
311 int clone_skb; /*
312 * Use multiple SKBs during packet gen.
313 * If this number is greater than 1, then
314 * that many copies of the same packet will be
315 * sent before a new packet is allocated.
316 * If you want to send 1024 identical packets
317 * before creating a new packet,
318 * set clone_skb to 1024.
319 */
320
321 char dst_min[IP_NAME_SZ]; /* IP, ie 1.2.3.4 */
322 char dst_max[IP_NAME_SZ]; /* IP, ie 1.2.3.4 */
323 char src_min[IP_NAME_SZ]; /* IP, ie 1.2.3.4 */
324 char src_max[IP_NAME_SZ]; /* IP, ie 1.2.3.4 */
325
326 struct in6_addr in6_saddr;
327 struct in6_addr in6_daddr;
328 struct in6_addr cur_in6_daddr;
329 struct in6_addr cur_in6_saddr;
330 /* For ranges */
331 struct in6_addr min_in6_daddr;
332 struct in6_addr max_in6_daddr;
333 struct in6_addr min_in6_saddr;
334 struct in6_addr max_in6_saddr;
335
336 /* If we're doing ranges, random or incremental, then this
337 * defines the min/max for those ranges.
338 */
339 __be32 saddr_min; /* inclusive, source IP address */
340 __be32 saddr_max; /* exclusive, source IP address */
341 __be32 daddr_min; /* inclusive, dest IP address */
342 __be32 daddr_max; /* exclusive, dest IP address */
343
344 __u16 udp_src_min; /* inclusive, source UDP port */
345 __u16 udp_src_max; /* exclusive, source UDP port */
346 __u16 udp_dst_min; /* inclusive, dest UDP port */
347 __u16 udp_dst_max; /* exclusive, dest UDP port */
348
349 /* DSCP + ECN */
350 __u8 tos; /* six MSB of (former) IPv4 TOS
351 are for dscp codepoint */
352 __u8 traffic_class; /* ditto for the (former) Traffic Class in IPv6
353 (see RFC 3260, sec. 4) */
354
355 /* IMIX */
356 unsigned int n_imix_entries;
357 struct imix_pkt imix_entries[MAX_IMIX_ENTRIES];
358 /* Maps 0-IMIX_PRECISION range to imix_entry based on probability*/
359 __u8 imix_distribution[IMIX_PRECISION];
360
361 /* MPLS */
362 unsigned int nr_labels; /* Depth of stack, 0 = no MPLS */
363 __be32 labels[MAX_MPLS_LABELS];
364
365 /* VLAN/SVLAN (802.1Q/Q-in-Q) */
366 __u8 vlan_p;
367 __u8 vlan_cfi;
368 __u16 vlan_id; /* 0xffff means no vlan tag */
369
370 __u8 svlan_p;
371 __u8 svlan_cfi;
372 __u16 svlan_id; /* 0xffff means no svlan tag */
373
374 __u32 src_mac_count; /* How many MACs to iterate through */
375 __u32 dst_mac_count; /* How many MACs to iterate through */
376
377 unsigned char dst_mac[ETH_ALEN];
378 unsigned char src_mac[ETH_ALEN];
379
380 __u32 cur_dst_mac_offset;
381 __u32 cur_src_mac_offset;
382 __be32 cur_saddr;
383 __be32 cur_daddr;
384 __u16 ip_id;
385 __u16 cur_udp_dst;
386 __u16 cur_udp_src;
387 __u16 cur_queue_map;
388 __u32 cur_pkt_size;
389 __u32 last_pkt_size;
390
391 __u8 hh[14];
392 /* = {
393 0x00, 0x80, 0xC8, 0x79, 0xB3, 0xCB,
394
395 We fill in SRC address later
396 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
397 0x08, 0x00
398 };
399 */
400 __u16 pad; /* pad out the hh struct to an even 16 bytes */
401
402 struct sk_buff *skb; /* skb we are to transmit next, used for when we
403 * are transmitting the same one multiple times
404 */
405 struct net_device *odev; /* The out-going device.
406 * Note that the device should have it's
407 * pg_info pointer pointing back to this
408 * device.
409 * Set when the user specifies the out-going
410 * device name (not when the inject is
411 * started as it used to do.)
412 */
413 netdevice_tracker dev_tracker;
414 char odevname[32];
415 struct flow_state *flows;
416 unsigned int cflows; /* Concurrent flows (config) */
417 unsigned int lflow; /* Flow length (config) */
418 unsigned int nflows; /* accumulated flows (stats) */
419 unsigned int curfl; /* current sequenced flow (state)*/
420
421 u16 queue_map_min;
422 u16 queue_map_max;
423 __u32 skb_priority; /* skb priority field */
424 unsigned int burst; /* number of duplicated packets to burst */
425 int node; /* Memory node */
426
427 #ifdef CONFIG_XFRM
428 __u8 ipsmode; /* IPSEC mode (config) */
429 __u8 ipsproto; /* IPSEC type (config) */
430 __u32 spi;
431 struct xfrm_dst xdst;
432 struct dst_ops dstops;
433 #endif
434 char result[512];
435 };
436
437 struct pktgen_hdr {
438 __be32 pgh_magic;
439 __be32 seq_num;
440 __be32 tv_sec;
441 __be32 tv_usec;
442 };
443
444
445 static unsigned int pg_net_id __read_mostly;
446
447 struct pktgen_net {
448 struct net *net;
449 struct proc_dir_entry *proc_dir;
450 struct list_head pktgen_threads;
451 bool pktgen_exiting;
452 };
453
454 struct pktgen_thread {
455 struct mutex if_lock; /* for list of devices */
456 struct list_head if_list; /* All device here */
457 struct list_head th_list;
458 struct task_struct *tsk;
459 char result[512];
460
461 /* Field for thread to receive "posted" events terminate,
462 stop ifs etc. */
463
464 u32 control;
465 int cpu;
466
467 wait_queue_head_t queue;
468 struct completion start_done;
469 struct pktgen_net *net;
470 };
471
472 #define REMOVE 1
473 #define FIND 0
474
475 static const char version[] =
476 "Packet Generator for packet performance testing. "
477 "Version: " VERSION "\n";
478
479 static int pktgen_remove_device(struct pktgen_thread *t, struct pktgen_dev *i);
480 static int pktgen_add_device(struct pktgen_thread *t, const char *ifname);
481 static struct pktgen_dev *pktgen_find_dev(struct pktgen_thread *t,
482 const char *ifname, bool exact);
483 static int pktgen_device_event(struct notifier_block *, unsigned long, void *);
484 static void pktgen_run_all_threads(struct pktgen_net *pn);
485 static void pktgen_reset_all_threads(struct pktgen_net *pn);
486 static void pktgen_stop_all_threads(struct pktgen_net *pn);
487
488 static void pktgen_stop(struct pktgen_thread *t);
489 static void pktgen_clear_counters(struct pktgen_dev *pkt_dev);
490 static void fill_imix_distribution(struct pktgen_dev *pkt_dev);
491
492 /* Module parameters, defaults. */
493 static int pg_count_d __read_mostly = 1000;
494 static int pg_delay_d __read_mostly;
495 static int pg_clone_skb_d __read_mostly;
496 static int debug __read_mostly;
497
498 static DEFINE_MUTEX(pktgen_thread_lock);
499
500 static struct notifier_block pktgen_notifier_block = {
501 .notifier_call = pktgen_device_event,
502 };
503
504 /*
505 * /proc handling functions
506 *
507 */
508
pgctrl_show(struct seq_file * seq,void * v)509 static int pgctrl_show(struct seq_file *seq, void *v)
510 {
511 seq_puts(seq, version);
512 return 0;
513 }
514
pgctrl_write(struct file * file,const char __user * buf,size_t count,loff_t * ppos)515 static ssize_t pgctrl_write(struct file *file, const char __user *buf,
516 size_t count, loff_t *ppos)
517 {
518 char data[128];
519 struct pktgen_net *pn = net_generic(current->nsproxy->net_ns, pg_net_id);
520
521 if (!capable(CAP_NET_ADMIN))
522 return -EPERM;
523
524 if (count == 0)
525 return -EINVAL;
526
527 if (count > sizeof(data))
528 count = sizeof(data);
529
530 if (copy_from_user(data, buf, count))
531 return -EFAULT;
532
533 data[count - 1] = 0; /* Strip trailing '\n' and terminate string */
534
535 if (!strcmp(data, "stop"))
536 pktgen_stop_all_threads(pn);
537 else if (!strcmp(data, "start"))
538 pktgen_run_all_threads(pn);
539 else if (!strcmp(data, "reset"))
540 pktgen_reset_all_threads(pn);
541 else
542 return -EINVAL;
543
544 return count;
545 }
546
pgctrl_open(struct inode * inode,struct file * file)547 static int pgctrl_open(struct inode *inode, struct file *file)
548 {
549 return single_open(file, pgctrl_show, pde_data(inode));
550 }
551
552 static const struct proc_ops pktgen_proc_ops = {
553 .proc_open = pgctrl_open,
554 .proc_read = seq_read,
555 .proc_lseek = seq_lseek,
556 .proc_write = pgctrl_write,
557 .proc_release = single_release,
558 };
559
pktgen_if_show(struct seq_file * seq,void * v)560 static int pktgen_if_show(struct seq_file *seq, void *v)
561 {
562 const struct pktgen_dev *pkt_dev = seq->private;
563 ktime_t stopped;
564 unsigned int i;
565 u64 idle;
566
567 seq_printf(seq,
568 "Params: count %llu min_pkt_size: %u max_pkt_size: %u\n",
569 (unsigned long long)pkt_dev->count, pkt_dev->min_pkt_size,
570 pkt_dev->max_pkt_size);
571
572 if (pkt_dev->n_imix_entries > 0) {
573 seq_puts(seq, " imix_weights: ");
574 for (i = 0; i < pkt_dev->n_imix_entries; i++) {
575 seq_printf(seq, "%llu,%llu ",
576 pkt_dev->imix_entries[i].size,
577 pkt_dev->imix_entries[i].weight);
578 }
579 seq_puts(seq, "\n");
580 }
581
582 seq_printf(seq,
583 " frags: %d delay: %llu clone_skb: %d ifname: %s\n",
584 pkt_dev->nfrags, (unsigned long long) pkt_dev->delay,
585 pkt_dev->clone_skb, pkt_dev->odevname);
586
587 seq_printf(seq, " flows: %u flowlen: %u\n", pkt_dev->cflows,
588 pkt_dev->lflow);
589
590 seq_printf(seq,
591 " queue_map_min: %u queue_map_max: %u\n",
592 pkt_dev->queue_map_min,
593 pkt_dev->queue_map_max);
594
595 if (pkt_dev->skb_priority)
596 seq_printf(seq, " skb_priority: %u\n",
597 pkt_dev->skb_priority);
598
599 if (pkt_dev->flags & F_IPV6) {
600 seq_printf(seq,
601 " saddr: %pI6c min_saddr: %pI6c max_saddr: %pI6c\n"
602 " daddr: %pI6c min_daddr: %pI6c max_daddr: %pI6c\n",
603 &pkt_dev->in6_saddr,
604 &pkt_dev->min_in6_saddr, &pkt_dev->max_in6_saddr,
605 &pkt_dev->in6_daddr,
606 &pkt_dev->min_in6_daddr, &pkt_dev->max_in6_daddr);
607 } else {
608 seq_printf(seq,
609 " dst_min: %s dst_max: %s\n",
610 pkt_dev->dst_min, pkt_dev->dst_max);
611 seq_printf(seq,
612 " src_min: %s src_max: %s\n",
613 pkt_dev->src_min, pkt_dev->src_max);
614 }
615
616 seq_puts(seq, " src_mac: ");
617
618 seq_printf(seq, "%pM ",
619 is_zero_ether_addr(pkt_dev->src_mac) ?
620 pkt_dev->odev->dev_addr : pkt_dev->src_mac);
621
622 seq_puts(seq, "dst_mac: ");
623 seq_printf(seq, "%pM\n", pkt_dev->dst_mac);
624
625 seq_printf(seq,
626 " udp_src_min: %d udp_src_max: %d"
627 " udp_dst_min: %d udp_dst_max: %d\n",
628 pkt_dev->udp_src_min, pkt_dev->udp_src_max,
629 pkt_dev->udp_dst_min, pkt_dev->udp_dst_max);
630
631 seq_printf(seq,
632 " src_mac_count: %d dst_mac_count: %d\n",
633 pkt_dev->src_mac_count, pkt_dev->dst_mac_count);
634
635 if (pkt_dev->nr_labels) {
636 seq_puts(seq, " mpls: ");
637 for (i = 0; i < pkt_dev->nr_labels; i++)
638 seq_printf(seq, "%08x%s", ntohl(pkt_dev->labels[i]),
639 i == pkt_dev->nr_labels-1 ? "\n" : ", ");
640 }
641
642 if (pkt_dev->vlan_id != 0xffff)
643 seq_printf(seq, " vlan_id: %u vlan_p: %u vlan_cfi: %u\n",
644 pkt_dev->vlan_id, pkt_dev->vlan_p,
645 pkt_dev->vlan_cfi);
646
647 if (pkt_dev->svlan_id != 0xffff)
648 seq_printf(seq, " svlan_id: %u vlan_p: %u vlan_cfi: %u\n",
649 pkt_dev->svlan_id, pkt_dev->svlan_p,
650 pkt_dev->svlan_cfi);
651
652 if (pkt_dev->tos)
653 seq_printf(seq, " tos: 0x%02x\n", pkt_dev->tos);
654
655 if (pkt_dev->traffic_class)
656 seq_printf(seq, " traffic_class: 0x%02x\n", pkt_dev->traffic_class);
657
658 if (pkt_dev->burst > 1)
659 seq_printf(seq, " burst: %d\n", pkt_dev->burst);
660
661 if (pkt_dev->node >= 0)
662 seq_printf(seq, " node: %d\n", pkt_dev->node);
663
664 if (pkt_dev->xmit_mode == M_NETIF_RECEIVE)
665 seq_puts(seq, " xmit_mode: netif_receive\n");
666 else if (pkt_dev->xmit_mode == M_QUEUE_XMIT)
667 seq_puts(seq, " xmit_mode: xmit_queue\n");
668
669 seq_puts(seq, " Flags: ");
670
671 for (i = 0; i < NR_PKT_FLAGS; i++) {
672 if (i == FLOW_SEQ_SHIFT)
673 if (!pkt_dev->cflows)
674 continue;
675
676 if (pkt_dev->flags & (1 << i)) {
677 seq_printf(seq, "%s ", pkt_flag_names[i]);
678 #ifdef CONFIG_XFRM
679 if (i == IPSEC_SHIFT && pkt_dev->spi)
680 seq_printf(seq, "spi:%u ", pkt_dev->spi);
681 #endif
682 } else if (i == FLOW_SEQ_SHIFT) {
683 seq_puts(seq, "FLOW_RND ");
684 }
685 }
686
687 seq_puts(seq, "\n");
688
689 /* not really stopped, more like last-running-at */
690 stopped = pkt_dev->running ? ktime_get() : pkt_dev->stopped_at;
691 idle = pkt_dev->idle_acc;
692 do_div(idle, NSEC_PER_USEC);
693
694 seq_printf(seq,
695 "Current:\n pkts-sofar: %llu errors: %llu\n",
696 (unsigned long long)pkt_dev->sofar,
697 (unsigned long long)pkt_dev->errors);
698
699 if (pkt_dev->n_imix_entries > 0) {
700 int i;
701
702 seq_puts(seq, " imix_size_counts: ");
703 for (i = 0; i < pkt_dev->n_imix_entries; i++) {
704 seq_printf(seq, "%llu,%llu ",
705 pkt_dev->imix_entries[i].size,
706 pkt_dev->imix_entries[i].count_so_far);
707 }
708 seq_puts(seq, "\n");
709 }
710
711 seq_printf(seq,
712 " started: %lluus stopped: %lluus idle: %lluus\n",
713 (unsigned long long) ktime_to_us(pkt_dev->started_at),
714 (unsigned long long) ktime_to_us(stopped),
715 (unsigned long long) idle);
716
717 seq_printf(seq,
718 " seq_num: %d cur_dst_mac_offset: %d cur_src_mac_offset: %d\n",
719 pkt_dev->seq_num, pkt_dev->cur_dst_mac_offset,
720 pkt_dev->cur_src_mac_offset);
721
722 if (pkt_dev->flags & F_IPV6) {
723 seq_printf(seq, " cur_saddr: %pI6c cur_daddr: %pI6c\n",
724 &pkt_dev->cur_in6_saddr,
725 &pkt_dev->cur_in6_daddr);
726 } else
727 seq_printf(seq, " cur_saddr: %pI4 cur_daddr: %pI4\n",
728 &pkt_dev->cur_saddr, &pkt_dev->cur_daddr);
729
730 seq_printf(seq, " cur_udp_dst: %d cur_udp_src: %d\n",
731 pkt_dev->cur_udp_dst, pkt_dev->cur_udp_src);
732
733 seq_printf(seq, " cur_queue_map: %u\n", pkt_dev->cur_queue_map);
734
735 seq_printf(seq, " flows: %u\n", pkt_dev->nflows);
736
737 if (pkt_dev->result[0])
738 seq_printf(seq, "Result: %s\n", pkt_dev->result);
739 else
740 seq_puts(seq, "Result: Idle\n");
741
742 return 0;
743 }
744
745
hex32_arg(const char __user * user_buffer,unsigned long maxlen,__u32 * num)746 static int hex32_arg(const char __user *user_buffer, unsigned long maxlen,
747 __u32 *num)
748 {
749 int i = 0;
750 *num = 0;
751
752 for (; i < maxlen; i++) {
753 int value;
754 char c;
755 *num <<= 4;
756 if (get_user(c, &user_buffer[i]))
757 return -EFAULT;
758 value = hex_to_bin(c);
759 if (value >= 0)
760 *num |= value;
761 else
762 break;
763 }
764 return i;
765 }
766
count_trail_chars(const char __user * user_buffer,unsigned int maxlen)767 static int count_trail_chars(const char __user * user_buffer,
768 unsigned int maxlen)
769 {
770 int i;
771
772 for (i = 0; i < maxlen; i++) {
773 char c;
774 if (get_user(c, &user_buffer[i]))
775 return -EFAULT;
776 switch (c) {
777 case '\"':
778 case '\n':
779 case '\r':
780 case '\t':
781 case ' ':
782 case '=':
783 break;
784 default:
785 goto done;
786 }
787 }
788 done:
789 return i;
790 }
791
num_arg(const char __user * user_buffer,unsigned long maxlen,unsigned long * num)792 static long num_arg(const char __user *user_buffer, unsigned long maxlen,
793 unsigned long *num)
794 {
795 int i;
796 *num = 0;
797
798 for (i = 0; i < maxlen; i++) {
799 char c;
800 if (get_user(c, &user_buffer[i]))
801 return -EFAULT;
802 if ((c >= '0') && (c <= '9')) {
803 *num *= 10;
804 *num += c - '0';
805 } else
806 break;
807 }
808 return i;
809 }
810
strn_len(const char __user * user_buffer,unsigned int maxlen)811 static int strn_len(const char __user * user_buffer, unsigned int maxlen)
812 {
813 int i;
814
815 for (i = 0; i < maxlen; i++) {
816 char c;
817 if (get_user(c, &user_buffer[i]))
818 return -EFAULT;
819 switch (c) {
820 case '\"':
821 case '\n':
822 case '\r':
823 case '\t':
824 case ' ':
825 goto done_str;
826 default:
827 break;
828 }
829 }
830 done_str:
831 return i;
832 }
833
834 /* Parses imix entries from user buffer.
835 * The user buffer should consist of imix entries separated by spaces
836 * where each entry consists of size and weight delimited by commas.
837 * "size1,weight_1 size2,weight_2 ... size_n,weight_n" for example.
838 */
get_imix_entries(const char __user * buffer,struct pktgen_dev * pkt_dev)839 static ssize_t get_imix_entries(const char __user *buffer,
840 struct pktgen_dev *pkt_dev)
841 {
842 const int max_digits = 10;
843 int i = 0;
844 long len;
845 char c;
846
847 pkt_dev->n_imix_entries = 0;
848
849 do {
850 unsigned long weight;
851 unsigned long size;
852
853 len = num_arg(&buffer[i], max_digits, &size);
854 if (len < 0)
855 return len;
856 i += len;
857 if (get_user(c, &buffer[i]))
858 return -EFAULT;
859 /* Check for comma between size_i and weight_i */
860 if (c != ',')
861 return -EINVAL;
862 i++;
863
864 if (size < 14 + 20 + 8)
865 size = 14 + 20 + 8;
866
867 len = num_arg(&buffer[i], max_digits, &weight);
868 if (len < 0)
869 return len;
870 if (weight <= 0)
871 return -EINVAL;
872
873 pkt_dev->imix_entries[pkt_dev->n_imix_entries].size = size;
874 pkt_dev->imix_entries[pkt_dev->n_imix_entries].weight = weight;
875
876 i += len;
877 if (get_user(c, &buffer[i]))
878 return -EFAULT;
879
880 i++;
881 pkt_dev->n_imix_entries++;
882
883 if (pkt_dev->n_imix_entries > MAX_IMIX_ENTRIES)
884 return -E2BIG;
885 } while (c == ' ');
886
887 return i;
888 }
889
get_labels(const char __user * buffer,struct pktgen_dev * pkt_dev)890 static ssize_t get_labels(const char __user *buffer, struct pktgen_dev *pkt_dev)
891 {
892 unsigned int n = 0;
893 char c;
894 ssize_t i = 0;
895 int len;
896
897 pkt_dev->nr_labels = 0;
898 do {
899 __u32 tmp;
900 len = hex32_arg(&buffer[i], 8, &tmp);
901 if (len <= 0)
902 return len;
903 pkt_dev->labels[n] = htonl(tmp);
904 if (pkt_dev->labels[n] & MPLS_STACK_BOTTOM)
905 pkt_dev->flags |= F_MPLS_RND;
906 i += len;
907 if (get_user(c, &buffer[i]))
908 return -EFAULT;
909 i++;
910 n++;
911 if (n >= MAX_MPLS_LABELS)
912 return -E2BIG;
913 } while (c == ',');
914
915 pkt_dev->nr_labels = n;
916 return i;
917 }
918
pktgen_read_flag(const char * f,bool * disable)919 static __u32 pktgen_read_flag(const char *f, bool *disable)
920 {
921 __u32 i;
922
923 if (f[0] == '!') {
924 *disable = true;
925 f++;
926 }
927
928 for (i = 0; i < NR_PKT_FLAGS; i++) {
929 if (!IS_ENABLED(CONFIG_XFRM) && i == IPSEC_SHIFT)
930 continue;
931
932 /* allow only disabling ipv6 flag */
933 if (!*disable && i == IPV6_SHIFT)
934 continue;
935
936 if (strcmp(f, pkt_flag_names[i]) == 0)
937 return 1 << i;
938 }
939
940 if (strcmp(f, "FLOW_RND") == 0) {
941 *disable = !*disable;
942 return F_FLOW_SEQ;
943 }
944
945 return 0;
946 }
947
pktgen_if_write(struct file * file,const char __user * user_buffer,size_t count,loff_t * offset)948 static ssize_t pktgen_if_write(struct file *file,
949 const char __user * user_buffer, size_t count,
950 loff_t * offset)
951 {
952 struct seq_file *seq = file->private_data;
953 struct pktgen_dev *pkt_dev = seq->private;
954 int i, max, len;
955 char name[16], valstr[32];
956 unsigned long value = 0;
957 char *pg_result = NULL;
958 int tmp = 0;
959 char buf[128];
960
961 pg_result = &(pkt_dev->result[0]);
962
963 if (count < 1) {
964 pr_warn("wrong command format\n");
965 return -EINVAL;
966 }
967
968 max = count;
969 tmp = count_trail_chars(user_buffer, max);
970 if (tmp < 0) {
971 pr_warn("illegal format\n");
972 return tmp;
973 }
974 i = tmp;
975
976 /* Read variable name */
977
978 len = strn_len(&user_buffer[i], sizeof(name) - 1);
979 if (len < 0)
980 return len;
981
982 memset(name, 0, sizeof(name));
983 if (copy_from_user(name, &user_buffer[i], len))
984 return -EFAULT;
985 i += len;
986
987 max = count - i;
988 len = count_trail_chars(&user_buffer[i], max);
989 if (len < 0)
990 return len;
991
992 i += len;
993
994 if (debug) {
995 size_t copy = min_t(size_t, count + 1, 1024);
996 char *tp = strndup_user(user_buffer, copy);
997
998 if (IS_ERR(tp))
999 return PTR_ERR(tp);
1000
1001 pr_debug("%s,%zu buffer -:%s:-\n", name, count, tp);
1002 kfree(tp);
1003 }
1004
1005 if (!strcmp(name, "min_pkt_size")) {
1006 len = num_arg(&user_buffer[i], 10, &value);
1007 if (len < 0)
1008 return len;
1009
1010 i += len;
1011 if (value < 14 + 20 + 8)
1012 value = 14 + 20 + 8;
1013 if (value != pkt_dev->min_pkt_size) {
1014 pkt_dev->min_pkt_size = value;
1015 pkt_dev->cur_pkt_size = value;
1016 }
1017 sprintf(pg_result, "OK: min_pkt_size=%d",
1018 pkt_dev->min_pkt_size);
1019 return count;
1020 }
1021
1022 if (!strcmp(name, "max_pkt_size")) {
1023 len = num_arg(&user_buffer[i], 10, &value);
1024 if (len < 0)
1025 return len;
1026
1027 i += len;
1028 if (value < 14 + 20 + 8)
1029 value = 14 + 20 + 8;
1030 if (value != pkt_dev->max_pkt_size) {
1031 pkt_dev->max_pkt_size = value;
1032 pkt_dev->cur_pkt_size = value;
1033 }
1034 sprintf(pg_result, "OK: max_pkt_size=%d",
1035 pkt_dev->max_pkt_size);
1036 return count;
1037 }
1038
1039 /* Shortcut for min = max */
1040
1041 if (!strcmp(name, "pkt_size")) {
1042 len = num_arg(&user_buffer[i], 10, &value);
1043 if (len < 0)
1044 return len;
1045
1046 i += len;
1047 if (value < 14 + 20 + 8)
1048 value = 14 + 20 + 8;
1049 if (value != pkt_dev->min_pkt_size) {
1050 pkt_dev->min_pkt_size = value;
1051 pkt_dev->max_pkt_size = value;
1052 pkt_dev->cur_pkt_size = value;
1053 }
1054 sprintf(pg_result, "OK: pkt_size=%d", pkt_dev->min_pkt_size);
1055 return count;
1056 }
1057
1058 if (!strcmp(name, "imix_weights")) {
1059 if (pkt_dev->clone_skb > 0)
1060 return -EINVAL;
1061
1062 len = get_imix_entries(&user_buffer[i], pkt_dev);
1063 if (len < 0)
1064 return len;
1065
1066 fill_imix_distribution(pkt_dev);
1067
1068 i += len;
1069 return count;
1070 }
1071
1072 if (!strcmp(name, "debug")) {
1073 len = num_arg(&user_buffer[i], 10, &value);
1074 if (len < 0)
1075 return len;
1076
1077 i += len;
1078 debug = value;
1079 sprintf(pg_result, "OK: debug=%u", debug);
1080 return count;
1081 }
1082
1083 if (!strcmp(name, "frags")) {
1084 len = num_arg(&user_buffer[i], 10, &value);
1085 if (len < 0)
1086 return len;
1087
1088 i += len;
1089 pkt_dev->nfrags = value;
1090 sprintf(pg_result, "OK: frags=%d", pkt_dev->nfrags);
1091 return count;
1092 }
1093 if (!strcmp(name, "delay")) {
1094 len = num_arg(&user_buffer[i], 10, &value);
1095 if (len < 0)
1096 return len;
1097
1098 i += len;
1099 if (value == 0x7FFFFFFF)
1100 pkt_dev->delay = ULLONG_MAX;
1101 else
1102 pkt_dev->delay = (u64)value;
1103
1104 sprintf(pg_result, "OK: delay=%llu",
1105 (unsigned long long) pkt_dev->delay);
1106 return count;
1107 }
1108 if (!strcmp(name, "rate")) {
1109 len = num_arg(&user_buffer[i], 10, &value);
1110 if (len < 0)
1111 return len;
1112
1113 i += len;
1114 if (!value)
1115 return len;
1116 pkt_dev->delay = pkt_dev->min_pkt_size*8*NSEC_PER_USEC/value;
1117 if (debug)
1118 pr_info("Delay set at: %llu ns\n", pkt_dev->delay);
1119
1120 sprintf(pg_result, "OK: rate=%lu", value);
1121 return count;
1122 }
1123 if (!strcmp(name, "ratep")) {
1124 len = num_arg(&user_buffer[i], 10, &value);
1125 if (len < 0)
1126 return len;
1127
1128 i += len;
1129 if (!value)
1130 return len;
1131 pkt_dev->delay = NSEC_PER_SEC/value;
1132 if (debug)
1133 pr_info("Delay set at: %llu ns\n", pkt_dev->delay);
1134
1135 sprintf(pg_result, "OK: rate=%lu", value);
1136 return count;
1137 }
1138 if (!strcmp(name, "udp_src_min")) {
1139 len = num_arg(&user_buffer[i], 10, &value);
1140 if (len < 0)
1141 return len;
1142
1143 i += len;
1144 if (value != pkt_dev->udp_src_min) {
1145 pkt_dev->udp_src_min = value;
1146 pkt_dev->cur_udp_src = value;
1147 }
1148 sprintf(pg_result, "OK: udp_src_min=%u", pkt_dev->udp_src_min);
1149 return count;
1150 }
1151 if (!strcmp(name, "udp_dst_min")) {
1152 len = num_arg(&user_buffer[i], 10, &value);
1153 if (len < 0)
1154 return len;
1155
1156 i += len;
1157 if (value != pkt_dev->udp_dst_min) {
1158 pkt_dev->udp_dst_min = value;
1159 pkt_dev->cur_udp_dst = value;
1160 }
1161 sprintf(pg_result, "OK: udp_dst_min=%u", pkt_dev->udp_dst_min);
1162 return count;
1163 }
1164 if (!strcmp(name, "udp_src_max")) {
1165 len = num_arg(&user_buffer[i], 10, &value);
1166 if (len < 0)
1167 return len;
1168
1169 i += len;
1170 if (value != pkt_dev->udp_src_max) {
1171 pkt_dev->udp_src_max = value;
1172 pkt_dev->cur_udp_src = value;
1173 }
1174 sprintf(pg_result, "OK: udp_src_max=%u", pkt_dev->udp_src_max);
1175 return count;
1176 }
1177 if (!strcmp(name, "udp_dst_max")) {
1178 len = num_arg(&user_buffer[i], 10, &value);
1179 if (len < 0)
1180 return len;
1181
1182 i += len;
1183 if (value != pkt_dev->udp_dst_max) {
1184 pkt_dev->udp_dst_max = value;
1185 pkt_dev->cur_udp_dst = value;
1186 }
1187 sprintf(pg_result, "OK: udp_dst_max=%u", pkt_dev->udp_dst_max);
1188 return count;
1189 }
1190 if (!strcmp(name, "clone_skb")) {
1191 len = num_arg(&user_buffer[i], 10, &value);
1192 if (len < 0)
1193 return len;
1194 /* clone_skb is not supported for netif_receive xmit_mode and
1195 * IMIX mode.
1196 */
1197 if ((value > 0) &&
1198 ((pkt_dev->xmit_mode == M_NETIF_RECEIVE) ||
1199 !(pkt_dev->odev->priv_flags & IFF_TX_SKB_SHARING)))
1200 return -ENOTSUPP;
1201 if (value > 0 && pkt_dev->n_imix_entries > 0)
1202 return -EINVAL;
1203
1204 i += len;
1205 pkt_dev->clone_skb = value;
1206
1207 sprintf(pg_result, "OK: clone_skb=%d", pkt_dev->clone_skb);
1208 return count;
1209 }
1210 if (!strcmp(name, "count")) {
1211 len = num_arg(&user_buffer[i], 10, &value);
1212 if (len < 0)
1213 return len;
1214
1215 i += len;
1216 pkt_dev->count = value;
1217 sprintf(pg_result, "OK: count=%llu",
1218 (unsigned long long)pkt_dev->count);
1219 return count;
1220 }
1221 if (!strcmp(name, "src_mac_count")) {
1222 len = num_arg(&user_buffer[i], 10, &value);
1223 if (len < 0)
1224 return len;
1225
1226 i += len;
1227 if (pkt_dev->src_mac_count != value) {
1228 pkt_dev->src_mac_count = value;
1229 pkt_dev->cur_src_mac_offset = 0;
1230 }
1231 sprintf(pg_result, "OK: src_mac_count=%d",
1232 pkt_dev->src_mac_count);
1233 return count;
1234 }
1235 if (!strcmp(name, "dst_mac_count")) {
1236 len = num_arg(&user_buffer[i], 10, &value);
1237 if (len < 0)
1238 return len;
1239
1240 i += len;
1241 if (pkt_dev->dst_mac_count != value) {
1242 pkt_dev->dst_mac_count = value;
1243 pkt_dev->cur_dst_mac_offset = 0;
1244 }
1245 sprintf(pg_result, "OK: dst_mac_count=%d",
1246 pkt_dev->dst_mac_count);
1247 return count;
1248 }
1249 if (!strcmp(name, "burst")) {
1250 len = num_arg(&user_buffer[i], 10, &value);
1251 if (len < 0)
1252 return len;
1253
1254 i += len;
1255 if ((value > 1) &&
1256 ((pkt_dev->xmit_mode == M_QUEUE_XMIT) ||
1257 ((pkt_dev->xmit_mode == M_START_XMIT) &&
1258 (!(pkt_dev->odev->priv_flags & IFF_TX_SKB_SHARING)))))
1259 return -ENOTSUPP;
1260 pkt_dev->burst = value < 1 ? 1 : value;
1261 sprintf(pg_result, "OK: burst=%u", pkt_dev->burst);
1262 return count;
1263 }
1264 if (!strcmp(name, "node")) {
1265 len = num_arg(&user_buffer[i], 10, &value);
1266 if (len < 0)
1267 return len;
1268
1269 i += len;
1270
1271 if (node_possible(value)) {
1272 pkt_dev->node = value;
1273 sprintf(pg_result, "OK: node=%d", pkt_dev->node);
1274 if (pkt_dev->page) {
1275 put_page(pkt_dev->page);
1276 pkt_dev->page = NULL;
1277 }
1278 }
1279 else
1280 sprintf(pg_result, "ERROR: node not possible");
1281 return count;
1282 }
1283 if (!strcmp(name, "xmit_mode")) {
1284 char f[32];
1285
1286 memset(f, 0, 32);
1287 len = strn_len(&user_buffer[i], sizeof(f) - 1);
1288 if (len < 0)
1289 return len;
1290
1291 if (copy_from_user(f, &user_buffer[i], len))
1292 return -EFAULT;
1293 i += len;
1294
1295 if (strcmp(f, "start_xmit") == 0) {
1296 pkt_dev->xmit_mode = M_START_XMIT;
1297 } else if (strcmp(f, "netif_receive") == 0) {
1298 /* clone_skb set earlier, not supported in this mode */
1299 if (pkt_dev->clone_skb > 0)
1300 return -ENOTSUPP;
1301
1302 pkt_dev->xmit_mode = M_NETIF_RECEIVE;
1303
1304 /* make sure new packet is allocated every time
1305 * pktgen_xmit() is called
1306 */
1307 pkt_dev->last_ok = 1;
1308 } else if (strcmp(f, "queue_xmit") == 0) {
1309 pkt_dev->xmit_mode = M_QUEUE_XMIT;
1310 pkt_dev->last_ok = 1;
1311 } else {
1312 sprintf(pg_result,
1313 "xmit_mode -:%s:- unknown\nAvailable modes: %s",
1314 f, "start_xmit, netif_receive\n");
1315 return count;
1316 }
1317 sprintf(pg_result, "OK: xmit_mode=%s", f);
1318 return count;
1319 }
1320 if (!strcmp(name, "flag")) {
1321 __u32 flag;
1322 char f[32];
1323 bool disable = false;
1324
1325 memset(f, 0, 32);
1326 len = strn_len(&user_buffer[i], sizeof(f) - 1);
1327 if (len < 0)
1328 return len;
1329
1330 if (copy_from_user(f, &user_buffer[i], len))
1331 return -EFAULT;
1332 i += len;
1333
1334 flag = pktgen_read_flag(f, &disable);
1335
1336 if (flag) {
1337 if (disable)
1338 pkt_dev->flags &= ~flag;
1339 else
1340 pkt_dev->flags |= flag;
1341 } else {
1342 sprintf(pg_result,
1343 "Flag -:%s:- unknown\nAvailable flags, (prepend ! to un-set flag):\n%s",
1344 f,
1345 "IPSRC_RND, IPDST_RND, UDPSRC_RND, UDPDST_RND, "
1346 "MACSRC_RND, MACDST_RND, TXSIZE_RND, IPV6, "
1347 "MPLS_RND, VID_RND, SVID_RND, FLOW_SEQ, "
1348 "QUEUE_MAP_RND, QUEUE_MAP_CPU, UDPCSUM, "
1349 "NO_TIMESTAMP, "
1350 #ifdef CONFIG_XFRM
1351 "IPSEC, "
1352 #endif
1353 "NODE_ALLOC\n");
1354 return count;
1355 }
1356 sprintf(pg_result, "OK: flags=0x%x", pkt_dev->flags);
1357 return count;
1358 }
1359 if (!strcmp(name, "dst_min") || !strcmp(name, "dst")) {
1360 len = strn_len(&user_buffer[i], sizeof(pkt_dev->dst_min) - 1);
1361 if (len < 0)
1362 return len;
1363
1364 if (copy_from_user(buf, &user_buffer[i], len))
1365 return -EFAULT;
1366 buf[len] = 0;
1367 if (strcmp(buf, pkt_dev->dst_min) != 0) {
1368 memset(pkt_dev->dst_min, 0, sizeof(pkt_dev->dst_min));
1369 strcpy(pkt_dev->dst_min, buf);
1370 pkt_dev->daddr_min = in_aton(pkt_dev->dst_min);
1371 pkt_dev->cur_daddr = pkt_dev->daddr_min;
1372 }
1373 if (debug)
1374 pr_debug("dst_min set to: %s\n", pkt_dev->dst_min);
1375 i += len;
1376 sprintf(pg_result, "OK: dst_min=%s", pkt_dev->dst_min);
1377 return count;
1378 }
1379 if (!strcmp(name, "dst_max")) {
1380 len = strn_len(&user_buffer[i], sizeof(pkt_dev->dst_max) - 1);
1381 if (len < 0)
1382 return len;
1383
1384 if (copy_from_user(buf, &user_buffer[i], len))
1385 return -EFAULT;
1386 buf[len] = 0;
1387 if (strcmp(buf, pkt_dev->dst_max) != 0) {
1388 memset(pkt_dev->dst_max, 0, sizeof(pkt_dev->dst_max));
1389 strcpy(pkt_dev->dst_max, buf);
1390 pkt_dev->daddr_max = in_aton(pkt_dev->dst_max);
1391 pkt_dev->cur_daddr = pkt_dev->daddr_max;
1392 }
1393 if (debug)
1394 pr_debug("dst_max set to: %s\n", pkt_dev->dst_max);
1395 i += len;
1396 sprintf(pg_result, "OK: dst_max=%s", pkt_dev->dst_max);
1397 return count;
1398 }
1399 if (!strcmp(name, "dst6")) {
1400 len = strn_len(&user_buffer[i], sizeof(buf) - 1);
1401 if (len < 0)
1402 return len;
1403
1404 pkt_dev->flags |= F_IPV6;
1405
1406 if (copy_from_user(buf, &user_buffer[i], len))
1407 return -EFAULT;
1408 buf[len] = 0;
1409
1410 in6_pton(buf, -1, pkt_dev->in6_daddr.s6_addr, -1, NULL);
1411 snprintf(buf, sizeof(buf), "%pI6c", &pkt_dev->in6_daddr);
1412
1413 pkt_dev->cur_in6_daddr = pkt_dev->in6_daddr;
1414
1415 if (debug)
1416 pr_debug("dst6 set to: %s\n", buf);
1417
1418 i += len;
1419 sprintf(pg_result, "OK: dst6=%s", buf);
1420 return count;
1421 }
1422 if (!strcmp(name, "dst6_min")) {
1423 len = strn_len(&user_buffer[i], sizeof(buf) - 1);
1424 if (len < 0)
1425 return len;
1426
1427 pkt_dev->flags |= F_IPV6;
1428
1429 if (copy_from_user(buf, &user_buffer[i], len))
1430 return -EFAULT;
1431 buf[len] = 0;
1432
1433 in6_pton(buf, -1, pkt_dev->min_in6_daddr.s6_addr, -1, NULL);
1434 snprintf(buf, sizeof(buf), "%pI6c", &pkt_dev->min_in6_daddr);
1435
1436 pkt_dev->cur_in6_daddr = pkt_dev->min_in6_daddr;
1437 if (debug)
1438 pr_debug("dst6_min set to: %s\n", buf);
1439
1440 i += len;
1441 sprintf(pg_result, "OK: dst6_min=%s", buf);
1442 return count;
1443 }
1444 if (!strcmp(name, "dst6_max")) {
1445 len = strn_len(&user_buffer[i], sizeof(buf) - 1);
1446 if (len < 0)
1447 return len;
1448
1449 pkt_dev->flags |= F_IPV6;
1450
1451 if (copy_from_user(buf, &user_buffer[i], len))
1452 return -EFAULT;
1453 buf[len] = 0;
1454
1455 in6_pton(buf, -1, pkt_dev->max_in6_daddr.s6_addr, -1, NULL);
1456 snprintf(buf, sizeof(buf), "%pI6c", &pkt_dev->max_in6_daddr);
1457
1458 if (debug)
1459 pr_debug("dst6_max set to: %s\n", buf);
1460
1461 i += len;
1462 sprintf(pg_result, "OK: dst6_max=%s", buf);
1463 return count;
1464 }
1465 if (!strcmp(name, "src6")) {
1466 len = strn_len(&user_buffer[i], sizeof(buf) - 1);
1467 if (len < 0)
1468 return len;
1469
1470 pkt_dev->flags |= F_IPV6;
1471
1472 if (copy_from_user(buf, &user_buffer[i], len))
1473 return -EFAULT;
1474 buf[len] = 0;
1475
1476 in6_pton(buf, -1, pkt_dev->in6_saddr.s6_addr, -1, NULL);
1477 snprintf(buf, sizeof(buf), "%pI6c", &pkt_dev->in6_saddr);
1478
1479 pkt_dev->cur_in6_saddr = pkt_dev->in6_saddr;
1480
1481 if (debug)
1482 pr_debug("src6 set to: %s\n", buf);
1483
1484 i += len;
1485 sprintf(pg_result, "OK: src6=%s", buf);
1486 return count;
1487 }
1488 if (!strcmp(name, "src_min")) {
1489 len = strn_len(&user_buffer[i], sizeof(pkt_dev->src_min) - 1);
1490 if (len < 0)
1491 return len;
1492
1493 if (copy_from_user(buf, &user_buffer[i], len))
1494 return -EFAULT;
1495 buf[len] = 0;
1496 if (strcmp(buf, pkt_dev->src_min) != 0) {
1497 memset(pkt_dev->src_min, 0, sizeof(pkt_dev->src_min));
1498 strcpy(pkt_dev->src_min, buf);
1499 pkt_dev->saddr_min = in_aton(pkt_dev->src_min);
1500 pkt_dev->cur_saddr = pkt_dev->saddr_min;
1501 }
1502 if (debug)
1503 pr_debug("src_min set to: %s\n", pkt_dev->src_min);
1504 i += len;
1505 sprintf(pg_result, "OK: src_min=%s", pkt_dev->src_min);
1506 return count;
1507 }
1508 if (!strcmp(name, "src_max")) {
1509 len = strn_len(&user_buffer[i], sizeof(pkt_dev->src_max) - 1);
1510 if (len < 0)
1511 return len;
1512
1513 if (copy_from_user(buf, &user_buffer[i], len))
1514 return -EFAULT;
1515 buf[len] = 0;
1516 if (strcmp(buf, pkt_dev->src_max) != 0) {
1517 memset(pkt_dev->src_max, 0, sizeof(pkt_dev->src_max));
1518 strcpy(pkt_dev->src_max, buf);
1519 pkt_dev->saddr_max = in_aton(pkt_dev->src_max);
1520 pkt_dev->cur_saddr = pkt_dev->saddr_max;
1521 }
1522 if (debug)
1523 pr_debug("src_max set to: %s\n", pkt_dev->src_max);
1524 i += len;
1525 sprintf(pg_result, "OK: src_max=%s", pkt_dev->src_max);
1526 return count;
1527 }
1528 if (!strcmp(name, "dst_mac")) {
1529 len = strn_len(&user_buffer[i], sizeof(valstr) - 1);
1530 if (len < 0)
1531 return len;
1532
1533 memset(valstr, 0, sizeof(valstr));
1534 if (copy_from_user(valstr, &user_buffer[i], len))
1535 return -EFAULT;
1536
1537 if (!mac_pton(valstr, pkt_dev->dst_mac))
1538 return -EINVAL;
1539 /* Set up Dest MAC */
1540 ether_addr_copy(&pkt_dev->hh[0], pkt_dev->dst_mac);
1541
1542 sprintf(pg_result, "OK: dstmac %pM", pkt_dev->dst_mac);
1543 return count;
1544 }
1545 if (!strcmp(name, "src_mac")) {
1546 len = strn_len(&user_buffer[i], sizeof(valstr) - 1);
1547 if (len < 0)
1548 return len;
1549
1550 memset(valstr, 0, sizeof(valstr));
1551 if (copy_from_user(valstr, &user_buffer[i], len))
1552 return -EFAULT;
1553
1554 if (!mac_pton(valstr, pkt_dev->src_mac))
1555 return -EINVAL;
1556 /* Set up Src MAC */
1557 ether_addr_copy(&pkt_dev->hh[6], pkt_dev->src_mac);
1558
1559 sprintf(pg_result, "OK: srcmac %pM", pkt_dev->src_mac);
1560 return count;
1561 }
1562
1563 if (!strcmp(name, "clear_counters")) {
1564 pktgen_clear_counters(pkt_dev);
1565 sprintf(pg_result, "OK: Clearing counters.\n");
1566 return count;
1567 }
1568
1569 if (!strcmp(name, "flows")) {
1570 len = num_arg(&user_buffer[i], 10, &value);
1571 if (len < 0)
1572 return len;
1573
1574 i += len;
1575 if (value > MAX_CFLOWS)
1576 value = MAX_CFLOWS;
1577
1578 pkt_dev->cflows = value;
1579 sprintf(pg_result, "OK: flows=%u", pkt_dev->cflows);
1580 return count;
1581 }
1582 #ifdef CONFIG_XFRM
1583 if (!strcmp(name, "spi")) {
1584 len = num_arg(&user_buffer[i], 10, &value);
1585 if (len < 0)
1586 return len;
1587
1588 i += len;
1589 pkt_dev->spi = value;
1590 sprintf(pg_result, "OK: spi=%u", pkt_dev->spi);
1591 return count;
1592 }
1593 #endif
1594 if (!strcmp(name, "flowlen")) {
1595 len = num_arg(&user_buffer[i], 10, &value);
1596 if (len < 0)
1597 return len;
1598
1599 i += len;
1600 pkt_dev->lflow = value;
1601 sprintf(pg_result, "OK: flowlen=%u", pkt_dev->lflow);
1602 return count;
1603 }
1604
1605 if (!strcmp(name, "queue_map_min")) {
1606 len = num_arg(&user_buffer[i], 5, &value);
1607 if (len < 0)
1608 return len;
1609
1610 i += len;
1611 pkt_dev->queue_map_min = value;
1612 sprintf(pg_result, "OK: queue_map_min=%u", pkt_dev->queue_map_min);
1613 return count;
1614 }
1615
1616 if (!strcmp(name, "queue_map_max")) {
1617 len = num_arg(&user_buffer[i], 5, &value);
1618 if (len < 0)
1619 return len;
1620
1621 i += len;
1622 pkt_dev->queue_map_max = value;
1623 sprintf(pg_result, "OK: queue_map_max=%u", pkt_dev->queue_map_max);
1624 return count;
1625 }
1626
1627 if (!strcmp(name, "mpls")) {
1628 unsigned int n, cnt;
1629
1630 len = get_labels(&user_buffer[i], pkt_dev);
1631 if (len < 0)
1632 return len;
1633 i += len;
1634 cnt = sprintf(pg_result, "OK: mpls=");
1635 for (n = 0; n < pkt_dev->nr_labels; n++)
1636 cnt += sprintf(pg_result + cnt,
1637 "%08x%s", ntohl(pkt_dev->labels[n]),
1638 n == pkt_dev->nr_labels-1 ? "" : ",");
1639
1640 if (pkt_dev->nr_labels && pkt_dev->vlan_id != 0xffff) {
1641 pkt_dev->vlan_id = 0xffff; /* turn off VLAN/SVLAN */
1642 pkt_dev->svlan_id = 0xffff;
1643
1644 if (debug)
1645 pr_debug("VLAN/SVLAN auto turned off\n");
1646 }
1647 return count;
1648 }
1649
1650 if (!strcmp(name, "vlan_id")) {
1651 len = num_arg(&user_buffer[i], 4, &value);
1652 if (len < 0)
1653 return len;
1654
1655 i += len;
1656 if (value <= 4095) {
1657 pkt_dev->vlan_id = value; /* turn on VLAN */
1658
1659 if (debug)
1660 pr_debug("VLAN turned on\n");
1661
1662 if (debug && pkt_dev->nr_labels)
1663 pr_debug("MPLS auto turned off\n");
1664
1665 pkt_dev->nr_labels = 0; /* turn off MPLS */
1666 sprintf(pg_result, "OK: vlan_id=%u", pkt_dev->vlan_id);
1667 } else {
1668 pkt_dev->vlan_id = 0xffff; /* turn off VLAN/SVLAN */
1669 pkt_dev->svlan_id = 0xffff;
1670
1671 if (debug)
1672 pr_debug("VLAN/SVLAN turned off\n");
1673 }
1674 return count;
1675 }
1676
1677 if (!strcmp(name, "vlan_p")) {
1678 len = num_arg(&user_buffer[i], 1, &value);
1679 if (len < 0)
1680 return len;
1681
1682 i += len;
1683 if ((value <= 7) && (pkt_dev->vlan_id != 0xffff)) {
1684 pkt_dev->vlan_p = value;
1685 sprintf(pg_result, "OK: vlan_p=%u", pkt_dev->vlan_p);
1686 } else {
1687 sprintf(pg_result, "ERROR: vlan_p must be 0-7");
1688 }
1689 return count;
1690 }
1691
1692 if (!strcmp(name, "vlan_cfi")) {
1693 len = num_arg(&user_buffer[i], 1, &value);
1694 if (len < 0)
1695 return len;
1696
1697 i += len;
1698 if ((value <= 1) && (pkt_dev->vlan_id != 0xffff)) {
1699 pkt_dev->vlan_cfi = value;
1700 sprintf(pg_result, "OK: vlan_cfi=%u", pkt_dev->vlan_cfi);
1701 } else {
1702 sprintf(pg_result, "ERROR: vlan_cfi must be 0-1");
1703 }
1704 return count;
1705 }
1706
1707 if (!strcmp(name, "svlan_id")) {
1708 len = num_arg(&user_buffer[i], 4, &value);
1709 if (len < 0)
1710 return len;
1711
1712 i += len;
1713 if ((value <= 4095) && ((pkt_dev->vlan_id != 0xffff))) {
1714 pkt_dev->svlan_id = value; /* turn on SVLAN */
1715
1716 if (debug)
1717 pr_debug("SVLAN turned on\n");
1718
1719 if (debug && pkt_dev->nr_labels)
1720 pr_debug("MPLS auto turned off\n");
1721
1722 pkt_dev->nr_labels = 0; /* turn off MPLS */
1723 sprintf(pg_result, "OK: svlan_id=%u", pkt_dev->svlan_id);
1724 } else {
1725 pkt_dev->vlan_id = 0xffff; /* turn off VLAN/SVLAN */
1726 pkt_dev->svlan_id = 0xffff;
1727
1728 if (debug)
1729 pr_debug("VLAN/SVLAN turned off\n");
1730 }
1731 return count;
1732 }
1733
1734 if (!strcmp(name, "svlan_p")) {
1735 len = num_arg(&user_buffer[i], 1, &value);
1736 if (len < 0)
1737 return len;
1738
1739 i += len;
1740 if ((value <= 7) && (pkt_dev->svlan_id != 0xffff)) {
1741 pkt_dev->svlan_p = value;
1742 sprintf(pg_result, "OK: svlan_p=%u", pkt_dev->svlan_p);
1743 } else {
1744 sprintf(pg_result, "ERROR: svlan_p must be 0-7");
1745 }
1746 return count;
1747 }
1748
1749 if (!strcmp(name, "svlan_cfi")) {
1750 len = num_arg(&user_buffer[i], 1, &value);
1751 if (len < 0)
1752 return len;
1753
1754 i += len;
1755 if ((value <= 1) && (pkt_dev->svlan_id != 0xffff)) {
1756 pkt_dev->svlan_cfi = value;
1757 sprintf(pg_result, "OK: svlan_cfi=%u", pkt_dev->svlan_cfi);
1758 } else {
1759 sprintf(pg_result, "ERROR: svlan_cfi must be 0-1");
1760 }
1761 return count;
1762 }
1763
1764 if (!strcmp(name, "tos")) {
1765 __u32 tmp_value = 0;
1766 len = hex32_arg(&user_buffer[i], 2, &tmp_value);
1767 if (len < 0)
1768 return len;
1769
1770 i += len;
1771 if (len == 2) {
1772 pkt_dev->tos = tmp_value;
1773 sprintf(pg_result, "OK: tos=0x%02x", pkt_dev->tos);
1774 } else {
1775 sprintf(pg_result, "ERROR: tos must be 00-ff");
1776 }
1777 return count;
1778 }
1779
1780 if (!strcmp(name, "traffic_class")) {
1781 __u32 tmp_value = 0;
1782 len = hex32_arg(&user_buffer[i], 2, &tmp_value);
1783 if (len < 0)
1784 return len;
1785
1786 i += len;
1787 if (len == 2) {
1788 pkt_dev->traffic_class = tmp_value;
1789 sprintf(pg_result, "OK: traffic_class=0x%02x", pkt_dev->traffic_class);
1790 } else {
1791 sprintf(pg_result, "ERROR: traffic_class must be 00-ff");
1792 }
1793 return count;
1794 }
1795
1796 if (!strcmp(name, "skb_priority")) {
1797 len = num_arg(&user_buffer[i], 9, &value);
1798 if (len < 0)
1799 return len;
1800
1801 i += len;
1802 pkt_dev->skb_priority = value;
1803 sprintf(pg_result, "OK: skb_priority=%i",
1804 pkt_dev->skb_priority);
1805 return count;
1806 }
1807
1808 sprintf(pkt_dev->result, "No such parameter \"%s\"", name);
1809 return -EINVAL;
1810 }
1811
pktgen_if_open(struct inode * inode,struct file * file)1812 static int pktgen_if_open(struct inode *inode, struct file *file)
1813 {
1814 return single_open(file, pktgen_if_show, pde_data(inode));
1815 }
1816
1817 static const struct proc_ops pktgen_if_proc_ops = {
1818 .proc_open = pktgen_if_open,
1819 .proc_read = seq_read,
1820 .proc_lseek = seq_lseek,
1821 .proc_write = pktgen_if_write,
1822 .proc_release = single_release,
1823 };
1824
pktgen_thread_show(struct seq_file * seq,void * v)1825 static int pktgen_thread_show(struct seq_file *seq, void *v)
1826 {
1827 struct pktgen_thread *t = seq->private;
1828 const struct pktgen_dev *pkt_dev;
1829
1830 BUG_ON(!t);
1831
1832 seq_puts(seq, "Running: ");
1833
1834 rcu_read_lock();
1835 list_for_each_entry_rcu(pkt_dev, &t->if_list, list)
1836 if (pkt_dev->running)
1837 seq_printf(seq, "%s ", pkt_dev->odevname);
1838
1839 seq_puts(seq, "\nStopped: ");
1840
1841 list_for_each_entry_rcu(pkt_dev, &t->if_list, list)
1842 if (!pkt_dev->running)
1843 seq_printf(seq, "%s ", pkt_dev->odevname);
1844
1845 if (t->result[0])
1846 seq_printf(seq, "\nResult: %s\n", t->result);
1847 else
1848 seq_puts(seq, "\nResult: NA\n");
1849
1850 rcu_read_unlock();
1851
1852 return 0;
1853 }
1854
pktgen_thread_write(struct file * file,const char __user * user_buffer,size_t count,loff_t * offset)1855 static ssize_t pktgen_thread_write(struct file *file,
1856 const char __user * user_buffer,
1857 size_t count, loff_t * offset)
1858 {
1859 struct seq_file *seq = file->private_data;
1860 struct pktgen_thread *t = seq->private;
1861 int i, max, len, ret;
1862 char name[40];
1863 char *pg_result;
1864
1865 if (count < 1) {
1866 // sprintf(pg_result, "Wrong command format");
1867 return -EINVAL;
1868 }
1869
1870 max = count;
1871 len = count_trail_chars(user_buffer, max);
1872 if (len < 0)
1873 return len;
1874
1875 i = len;
1876
1877 /* Read variable name */
1878
1879 len = strn_len(&user_buffer[i], sizeof(name) - 1);
1880 if (len < 0)
1881 return len;
1882
1883 memset(name, 0, sizeof(name));
1884 if (copy_from_user(name, &user_buffer[i], len))
1885 return -EFAULT;
1886 i += len;
1887
1888 max = count - i;
1889 len = count_trail_chars(&user_buffer[i], max);
1890 if (len < 0)
1891 return len;
1892
1893 i += len;
1894
1895 if (debug)
1896 pr_debug("t=%s, count=%lu\n", name, (unsigned long)count);
1897
1898 if (!t) {
1899 pr_err("ERROR: No thread\n");
1900 ret = -EINVAL;
1901 goto out;
1902 }
1903
1904 pg_result = &(t->result[0]);
1905
1906 if (!strcmp(name, "add_device")) {
1907 char f[32];
1908 memset(f, 0, 32);
1909 len = strn_len(&user_buffer[i], sizeof(f) - 1);
1910 if (len < 0) {
1911 ret = len;
1912 goto out;
1913 }
1914 if (copy_from_user(f, &user_buffer[i], len))
1915 return -EFAULT;
1916 i += len;
1917 mutex_lock(&pktgen_thread_lock);
1918 ret = pktgen_add_device(t, f);
1919 mutex_unlock(&pktgen_thread_lock);
1920 if (!ret) {
1921 ret = count;
1922 sprintf(pg_result, "OK: add_device=%s", f);
1923 } else
1924 sprintf(pg_result, "ERROR: can not add device %s", f);
1925 goto out;
1926 }
1927
1928 if (!strcmp(name, "rem_device_all")) {
1929 mutex_lock(&pktgen_thread_lock);
1930 t->control |= T_REMDEVALL;
1931 mutex_unlock(&pktgen_thread_lock);
1932 schedule_timeout_interruptible(msecs_to_jiffies(125)); /* Propagate thread->control */
1933 ret = count;
1934 sprintf(pg_result, "OK: rem_device_all");
1935 goto out;
1936 }
1937
1938 if (!strcmp(name, "max_before_softirq")) {
1939 sprintf(pg_result, "OK: Note! max_before_softirq is obsoleted -- Do not use");
1940 ret = count;
1941 goto out;
1942 }
1943
1944 ret = -EINVAL;
1945 out:
1946 return ret;
1947 }
1948
pktgen_thread_open(struct inode * inode,struct file * file)1949 static int pktgen_thread_open(struct inode *inode, struct file *file)
1950 {
1951 return single_open(file, pktgen_thread_show, pde_data(inode));
1952 }
1953
1954 static const struct proc_ops pktgen_thread_proc_ops = {
1955 .proc_open = pktgen_thread_open,
1956 .proc_read = seq_read,
1957 .proc_lseek = seq_lseek,
1958 .proc_write = pktgen_thread_write,
1959 .proc_release = single_release,
1960 };
1961
1962 /* Think find or remove for NN */
__pktgen_NN_threads(const struct pktgen_net * pn,const char * ifname,int remove)1963 static struct pktgen_dev *__pktgen_NN_threads(const struct pktgen_net *pn,
1964 const char *ifname, int remove)
1965 {
1966 struct pktgen_thread *t;
1967 struct pktgen_dev *pkt_dev = NULL;
1968 bool exact = (remove == FIND);
1969
1970 list_for_each_entry(t, &pn->pktgen_threads, th_list) {
1971 pkt_dev = pktgen_find_dev(t, ifname, exact);
1972 if (pkt_dev) {
1973 if (remove) {
1974 pkt_dev->removal_mark = 1;
1975 t->control |= T_REMDEV;
1976 }
1977 break;
1978 }
1979 }
1980 return pkt_dev;
1981 }
1982
1983 /*
1984 * mark a device for removal
1985 */
pktgen_mark_device(const struct pktgen_net * pn,const char * ifname)1986 static void pktgen_mark_device(const struct pktgen_net *pn, const char *ifname)
1987 {
1988 struct pktgen_dev *pkt_dev = NULL;
1989 const int max_tries = 10, msec_per_try = 125;
1990 int i = 0;
1991
1992 mutex_lock(&pktgen_thread_lock);
1993 pr_debug("%s: marking %s for removal\n", __func__, ifname);
1994
1995 while (1) {
1996
1997 pkt_dev = __pktgen_NN_threads(pn, ifname, REMOVE);
1998 if (pkt_dev == NULL)
1999 break; /* success */
2000
2001 mutex_unlock(&pktgen_thread_lock);
2002 pr_debug("%s: waiting for %s to disappear....\n",
2003 __func__, ifname);
2004 schedule_timeout_interruptible(msecs_to_jiffies(msec_per_try));
2005 mutex_lock(&pktgen_thread_lock);
2006
2007 if (++i >= max_tries) {
2008 pr_err("%s: timed out after waiting %d msec for device %s to be removed\n",
2009 __func__, msec_per_try * i, ifname);
2010 break;
2011 }
2012
2013 }
2014
2015 mutex_unlock(&pktgen_thread_lock);
2016 }
2017
pktgen_change_name(const struct pktgen_net * pn,struct net_device * dev)2018 static void pktgen_change_name(const struct pktgen_net *pn, struct net_device *dev)
2019 {
2020 struct pktgen_thread *t;
2021
2022 mutex_lock(&pktgen_thread_lock);
2023
2024 list_for_each_entry(t, &pn->pktgen_threads, th_list) {
2025 struct pktgen_dev *pkt_dev;
2026
2027 if_lock(t);
2028 list_for_each_entry(pkt_dev, &t->if_list, list) {
2029 if (pkt_dev->odev != dev)
2030 continue;
2031
2032 proc_remove(pkt_dev->entry);
2033
2034 pkt_dev->entry = proc_create_data(dev->name, 0600,
2035 pn->proc_dir,
2036 &pktgen_if_proc_ops,
2037 pkt_dev);
2038 if (!pkt_dev->entry)
2039 pr_err("can't move proc entry for '%s'\n",
2040 dev->name);
2041 break;
2042 }
2043 if_unlock(t);
2044 }
2045 mutex_unlock(&pktgen_thread_lock);
2046 }
2047
pktgen_device_event(struct notifier_block * unused,unsigned long event,void * ptr)2048 static int pktgen_device_event(struct notifier_block *unused,
2049 unsigned long event, void *ptr)
2050 {
2051 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2052 struct pktgen_net *pn = net_generic(dev_net(dev), pg_net_id);
2053
2054 if (pn->pktgen_exiting)
2055 return NOTIFY_DONE;
2056
2057 /* It is OK that we do not hold the group lock right now,
2058 * as we run under the RTNL lock.
2059 */
2060
2061 switch (event) {
2062 case NETDEV_CHANGENAME:
2063 pktgen_change_name(pn, dev);
2064 break;
2065
2066 case NETDEV_UNREGISTER:
2067 pktgen_mark_device(pn, dev->name);
2068 break;
2069 }
2070
2071 return NOTIFY_DONE;
2072 }
2073
pktgen_dev_get_by_name(const struct pktgen_net * pn,struct pktgen_dev * pkt_dev,const char * ifname)2074 static struct net_device *pktgen_dev_get_by_name(const struct pktgen_net *pn,
2075 struct pktgen_dev *pkt_dev,
2076 const char *ifname)
2077 {
2078 char b[IFNAMSIZ+5];
2079 int i;
2080
2081 for (i = 0; ifname[i] != '@'; i++) {
2082 if (i == IFNAMSIZ)
2083 break;
2084
2085 b[i] = ifname[i];
2086 }
2087 b[i] = 0;
2088
2089 return dev_get_by_name(pn->net, b);
2090 }
2091
2092
2093 /* Associate pktgen_dev with a device. */
2094
pktgen_setup_dev(const struct pktgen_net * pn,struct pktgen_dev * pkt_dev,const char * ifname)2095 static int pktgen_setup_dev(const struct pktgen_net *pn,
2096 struct pktgen_dev *pkt_dev, const char *ifname)
2097 {
2098 struct net_device *odev;
2099 int err;
2100
2101 /* Clean old setups */
2102 if (pkt_dev->odev) {
2103 netdev_put(pkt_dev->odev, &pkt_dev->dev_tracker);
2104 pkt_dev->odev = NULL;
2105 }
2106
2107 odev = pktgen_dev_get_by_name(pn, pkt_dev, ifname);
2108 if (!odev) {
2109 pr_err("no such netdevice: \"%s\"\n", ifname);
2110 return -ENODEV;
2111 }
2112
2113 if (odev->type != ARPHRD_ETHER && odev->type != ARPHRD_LOOPBACK) {
2114 pr_err("not an ethernet or loopback device: \"%s\"\n", ifname);
2115 err = -EINVAL;
2116 } else if (!netif_running(odev)) {
2117 pr_err("device is down: \"%s\"\n", ifname);
2118 err = -ENETDOWN;
2119 } else {
2120 pkt_dev->odev = odev;
2121 netdev_tracker_alloc(odev, &pkt_dev->dev_tracker, GFP_KERNEL);
2122 return 0;
2123 }
2124
2125 dev_put(odev);
2126 return err;
2127 }
2128
2129 /* Read pkt_dev from the interface and set up internal pktgen_dev
2130 * structure to have the right information to create/send packets
2131 */
pktgen_setup_inject(struct pktgen_dev * pkt_dev)2132 static void pktgen_setup_inject(struct pktgen_dev *pkt_dev)
2133 {
2134 int ntxq;
2135
2136 if (!pkt_dev->odev) {
2137 pr_err("ERROR: pkt_dev->odev == NULL in setup_inject\n");
2138 sprintf(pkt_dev->result,
2139 "ERROR: pkt_dev->odev == NULL in setup_inject.\n");
2140 return;
2141 }
2142
2143 /* make sure that we don't pick a non-existing transmit queue */
2144 ntxq = pkt_dev->odev->real_num_tx_queues;
2145
2146 if (ntxq <= pkt_dev->queue_map_min) {
2147 pr_warn("WARNING: Requested queue_map_min (zero-based) (%d) exceeds valid range [0 - %d] for (%d) queues on %s, resetting\n",
2148 pkt_dev->queue_map_min, (ntxq ?: 1) - 1, ntxq,
2149 pkt_dev->odevname);
2150 pkt_dev->queue_map_min = (ntxq ?: 1) - 1;
2151 }
2152 if (pkt_dev->queue_map_max >= ntxq) {
2153 pr_warn("WARNING: Requested queue_map_max (zero-based) (%d) exceeds valid range [0 - %d] for (%d) queues on %s, resetting\n",
2154 pkt_dev->queue_map_max, (ntxq ?: 1) - 1, ntxq,
2155 pkt_dev->odevname);
2156 pkt_dev->queue_map_max = (ntxq ?: 1) - 1;
2157 }
2158
2159 /* Default to the interface's mac if not explicitly set. */
2160
2161 if (is_zero_ether_addr(pkt_dev->src_mac))
2162 ether_addr_copy(&(pkt_dev->hh[6]), pkt_dev->odev->dev_addr);
2163
2164 /* Set up Dest MAC */
2165 ether_addr_copy(&(pkt_dev->hh[0]), pkt_dev->dst_mac);
2166
2167 if (pkt_dev->flags & F_IPV6) {
2168 int i, set = 0, err = 1;
2169 struct inet6_dev *idev;
2170
2171 if (pkt_dev->min_pkt_size == 0) {
2172 pkt_dev->min_pkt_size = 14 + sizeof(struct ipv6hdr)
2173 + sizeof(struct udphdr)
2174 + sizeof(struct pktgen_hdr)
2175 + pkt_dev->pkt_overhead;
2176 }
2177
2178 for (i = 0; i < sizeof(struct in6_addr); i++)
2179 if (pkt_dev->cur_in6_saddr.s6_addr[i]) {
2180 set = 1;
2181 break;
2182 }
2183
2184 if (!set) {
2185
2186 /*
2187 * Use linklevel address if unconfigured.
2188 *
2189 * use ipv6_get_lladdr if/when it's get exported
2190 */
2191
2192 rcu_read_lock();
2193 idev = __in6_dev_get(pkt_dev->odev);
2194 if (idev) {
2195 struct inet6_ifaddr *ifp;
2196
2197 read_lock_bh(&idev->lock);
2198 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2199 if ((ifp->scope & IFA_LINK) &&
2200 !(ifp->flags & IFA_F_TENTATIVE)) {
2201 pkt_dev->cur_in6_saddr = ifp->addr;
2202 err = 0;
2203 break;
2204 }
2205 }
2206 read_unlock_bh(&idev->lock);
2207 }
2208 rcu_read_unlock();
2209 if (err)
2210 pr_err("ERROR: IPv6 link address not available\n");
2211 }
2212 } else {
2213 if (pkt_dev->min_pkt_size == 0) {
2214 pkt_dev->min_pkt_size = 14 + sizeof(struct iphdr)
2215 + sizeof(struct udphdr)
2216 + sizeof(struct pktgen_hdr)
2217 + pkt_dev->pkt_overhead;
2218 }
2219
2220 pkt_dev->saddr_min = 0;
2221 pkt_dev->saddr_max = 0;
2222 if (strlen(pkt_dev->src_min) == 0) {
2223
2224 struct in_device *in_dev;
2225
2226 rcu_read_lock();
2227 in_dev = __in_dev_get_rcu(pkt_dev->odev);
2228 if (in_dev) {
2229 const struct in_ifaddr *ifa;
2230
2231 ifa = rcu_dereference(in_dev->ifa_list);
2232 if (ifa) {
2233 pkt_dev->saddr_min = ifa->ifa_address;
2234 pkt_dev->saddr_max = pkt_dev->saddr_min;
2235 }
2236 }
2237 rcu_read_unlock();
2238 } else {
2239 pkt_dev->saddr_min = in_aton(pkt_dev->src_min);
2240 pkt_dev->saddr_max = in_aton(pkt_dev->src_max);
2241 }
2242
2243 pkt_dev->daddr_min = in_aton(pkt_dev->dst_min);
2244 pkt_dev->daddr_max = in_aton(pkt_dev->dst_max);
2245 }
2246 /* Initialize current values. */
2247 pkt_dev->cur_pkt_size = pkt_dev->min_pkt_size;
2248 if (pkt_dev->min_pkt_size > pkt_dev->max_pkt_size)
2249 pkt_dev->max_pkt_size = pkt_dev->min_pkt_size;
2250
2251 pkt_dev->cur_dst_mac_offset = 0;
2252 pkt_dev->cur_src_mac_offset = 0;
2253 pkt_dev->cur_saddr = pkt_dev->saddr_min;
2254 pkt_dev->cur_daddr = pkt_dev->daddr_min;
2255 pkt_dev->cur_udp_dst = pkt_dev->udp_dst_min;
2256 pkt_dev->cur_udp_src = pkt_dev->udp_src_min;
2257 pkt_dev->nflows = 0;
2258 }
2259
2260
spin(struct pktgen_dev * pkt_dev,ktime_t spin_until)2261 static void spin(struct pktgen_dev *pkt_dev, ktime_t spin_until)
2262 {
2263 ktime_t start_time, end_time;
2264 s64 remaining;
2265 struct hrtimer_sleeper t;
2266
2267 hrtimer_init_sleeper_on_stack(&t, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
2268 hrtimer_set_expires(&t.timer, spin_until);
2269
2270 remaining = ktime_to_ns(hrtimer_expires_remaining(&t.timer));
2271 if (remaining <= 0)
2272 goto out;
2273
2274 start_time = ktime_get();
2275 if (remaining < 100000) {
2276 /* for small delays (<100us), just loop until limit is reached */
2277 do {
2278 end_time = ktime_get();
2279 } while (ktime_compare(end_time, spin_until) < 0);
2280 } else {
2281 do {
2282 set_current_state(TASK_INTERRUPTIBLE);
2283 hrtimer_sleeper_start_expires(&t, HRTIMER_MODE_ABS);
2284
2285 if (likely(t.task))
2286 schedule();
2287
2288 hrtimer_cancel(&t.timer);
2289 } while (t.task && pkt_dev->running && !signal_pending(current));
2290 __set_current_state(TASK_RUNNING);
2291 end_time = ktime_get();
2292 }
2293
2294 pkt_dev->idle_acc += ktime_to_ns(ktime_sub(end_time, start_time));
2295 out:
2296 pkt_dev->next_tx = ktime_add_ns(spin_until, pkt_dev->delay);
2297 destroy_hrtimer_on_stack(&t.timer);
2298 }
2299
set_pkt_overhead(struct pktgen_dev * pkt_dev)2300 static inline void set_pkt_overhead(struct pktgen_dev *pkt_dev)
2301 {
2302 pkt_dev->pkt_overhead = 0;
2303 pkt_dev->pkt_overhead += pkt_dev->nr_labels*sizeof(u32);
2304 pkt_dev->pkt_overhead += VLAN_TAG_SIZE(pkt_dev);
2305 pkt_dev->pkt_overhead += SVLAN_TAG_SIZE(pkt_dev);
2306 }
2307
f_seen(const struct pktgen_dev * pkt_dev,int flow)2308 static inline int f_seen(const struct pktgen_dev *pkt_dev, int flow)
2309 {
2310 return !!(pkt_dev->flows[flow].flags & F_INIT);
2311 }
2312
f_pick(struct pktgen_dev * pkt_dev)2313 static inline int f_pick(struct pktgen_dev *pkt_dev)
2314 {
2315 int flow = pkt_dev->curfl;
2316
2317 if (pkt_dev->flags & F_FLOW_SEQ) {
2318 if (pkt_dev->flows[flow].count >= pkt_dev->lflow) {
2319 /* reset time */
2320 pkt_dev->flows[flow].count = 0;
2321 pkt_dev->flows[flow].flags = 0;
2322 pkt_dev->curfl += 1;
2323 if (pkt_dev->curfl >= pkt_dev->cflows)
2324 pkt_dev->curfl = 0; /*reset */
2325 }
2326 } else {
2327 flow = get_random_u32_below(pkt_dev->cflows);
2328 pkt_dev->curfl = flow;
2329
2330 if (pkt_dev->flows[flow].count > pkt_dev->lflow) {
2331 pkt_dev->flows[flow].count = 0;
2332 pkt_dev->flows[flow].flags = 0;
2333 }
2334 }
2335
2336 return pkt_dev->curfl;
2337 }
2338
2339
2340 #ifdef CONFIG_XFRM
2341 /* If there was already an IPSEC SA, we keep it as is, else
2342 * we go look for it ...
2343 */
2344 #define DUMMY_MARK 0
get_ipsec_sa(struct pktgen_dev * pkt_dev,int flow)2345 static void get_ipsec_sa(struct pktgen_dev *pkt_dev, int flow)
2346 {
2347 struct xfrm_state *x = pkt_dev->flows[flow].x;
2348 struct pktgen_net *pn = net_generic(dev_net(pkt_dev->odev), pg_net_id);
2349 if (!x) {
2350
2351 if (pkt_dev->spi) {
2352 /* We need as quick as possible to find the right SA
2353 * Searching with minimum criteria to archieve this.
2354 */
2355 x = xfrm_state_lookup_byspi(pn->net, htonl(pkt_dev->spi), AF_INET);
2356 } else {
2357 /* slow path: we dont already have xfrm_state */
2358 x = xfrm_stateonly_find(pn->net, DUMMY_MARK, 0,
2359 (xfrm_address_t *)&pkt_dev->cur_daddr,
2360 (xfrm_address_t *)&pkt_dev->cur_saddr,
2361 AF_INET,
2362 pkt_dev->ipsmode,
2363 pkt_dev->ipsproto, 0);
2364 }
2365 if (x) {
2366 pkt_dev->flows[flow].x = x;
2367 set_pkt_overhead(pkt_dev);
2368 pkt_dev->pkt_overhead += x->props.header_len;
2369 }
2370
2371 }
2372 }
2373 #endif
set_cur_queue_map(struct pktgen_dev * pkt_dev)2374 static void set_cur_queue_map(struct pktgen_dev *pkt_dev)
2375 {
2376
2377 if (pkt_dev->flags & F_QUEUE_MAP_CPU)
2378 pkt_dev->cur_queue_map = smp_processor_id();
2379
2380 else if (pkt_dev->queue_map_min <= pkt_dev->queue_map_max) {
2381 __u16 t;
2382 if (pkt_dev->flags & F_QUEUE_MAP_RND) {
2383 t = get_random_u32_inclusive(pkt_dev->queue_map_min,
2384 pkt_dev->queue_map_max);
2385 } else {
2386 t = pkt_dev->cur_queue_map + 1;
2387 if (t > pkt_dev->queue_map_max)
2388 t = pkt_dev->queue_map_min;
2389 }
2390 pkt_dev->cur_queue_map = t;
2391 }
2392 pkt_dev->cur_queue_map = pkt_dev->cur_queue_map % pkt_dev->odev->real_num_tx_queues;
2393 }
2394
2395 /* Increment/randomize headers according to flags and current values
2396 * for IP src/dest, UDP src/dst port, MAC-Addr src/dst
2397 */
mod_cur_headers(struct pktgen_dev * pkt_dev)2398 static void mod_cur_headers(struct pktgen_dev *pkt_dev)
2399 {
2400 __u32 imn;
2401 __u32 imx;
2402 int flow = 0;
2403
2404 if (pkt_dev->cflows)
2405 flow = f_pick(pkt_dev);
2406
2407 /* Deal with source MAC */
2408 if (pkt_dev->src_mac_count > 1) {
2409 __u32 mc;
2410 __u32 tmp;
2411
2412 if (pkt_dev->flags & F_MACSRC_RND)
2413 mc = get_random_u32_below(pkt_dev->src_mac_count);
2414 else {
2415 mc = pkt_dev->cur_src_mac_offset++;
2416 if (pkt_dev->cur_src_mac_offset >=
2417 pkt_dev->src_mac_count)
2418 pkt_dev->cur_src_mac_offset = 0;
2419 }
2420
2421 tmp = pkt_dev->src_mac[5] + (mc & 0xFF);
2422 pkt_dev->hh[11] = tmp;
2423 tmp = (pkt_dev->src_mac[4] + ((mc >> 8) & 0xFF) + (tmp >> 8));
2424 pkt_dev->hh[10] = tmp;
2425 tmp = (pkt_dev->src_mac[3] + ((mc >> 16) & 0xFF) + (tmp >> 8));
2426 pkt_dev->hh[9] = tmp;
2427 tmp = (pkt_dev->src_mac[2] + ((mc >> 24) & 0xFF) + (tmp >> 8));
2428 pkt_dev->hh[8] = tmp;
2429 tmp = (pkt_dev->src_mac[1] + (tmp >> 8));
2430 pkt_dev->hh[7] = tmp;
2431 }
2432
2433 /* Deal with Destination MAC */
2434 if (pkt_dev->dst_mac_count > 1) {
2435 __u32 mc;
2436 __u32 tmp;
2437
2438 if (pkt_dev->flags & F_MACDST_RND)
2439 mc = get_random_u32_below(pkt_dev->dst_mac_count);
2440
2441 else {
2442 mc = pkt_dev->cur_dst_mac_offset++;
2443 if (pkt_dev->cur_dst_mac_offset >=
2444 pkt_dev->dst_mac_count) {
2445 pkt_dev->cur_dst_mac_offset = 0;
2446 }
2447 }
2448
2449 tmp = pkt_dev->dst_mac[5] + (mc & 0xFF);
2450 pkt_dev->hh[5] = tmp;
2451 tmp = (pkt_dev->dst_mac[4] + ((mc >> 8) & 0xFF) + (tmp >> 8));
2452 pkt_dev->hh[4] = tmp;
2453 tmp = (pkt_dev->dst_mac[3] + ((mc >> 16) & 0xFF) + (tmp >> 8));
2454 pkt_dev->hh[3] = tmp;
2455 tmp = (pkt_dev->dst_mac[2] + ((mc >> 24) & 0xFF) + (tmp >> 8));
2456 pkt_dev->hh[2] = tmp;
2457 tmp = (pkt_dev->dst_mac[1] + (tmp >> 8));
2458 pkt_dev->hh[1] = tmp;
2459 }
2460
2461 if (pkt_dev->flags & F_MPLS_RND) {
2462 unsigned int i;
2463 for (i = 0; i < pkt_dev->nr_labels; i++)
2464 if (pkt_dev->labels[i] & MPLS_STACK_BOTTOM)
2465 pkt_dev->labels[i] = MPLS_STACK_BOTTOM |
2466 ((__force __be32)get_random_u32() &
2467 htonl(0x000fffff));
2468 }
2469
2470 if ((pkt_dev->flags & F_VID_RND) && (pkt_dev->vlan_id != 0xffff)) {
2471 pkt_dev->vlan_id = get_random_u32_below(4096);
2472 }
2473
2474 if ((pkt_dev->flags & F_SVID_RND) && (pkt_dev->svlan_id != 0xffff)) {
2475 pkt_dev->svlan_id = get_random_u32_below(4096);
2476 }
2477
2478 if (pkt_dev->udp_src_min < pkt_dev->udp_src_max) {
2479 if (pkt_dev->flags & F_UDPSRC_RND)
2480 pkt_dev->cur_udp_src = get_random_u32_inclusive(pkt_dev->udp_src_min,
2481 pkt_dev->udp_src_max - 1);
2482
2483 else {
2484 pkt_dev->cur_udp_src++;
2485 if (pkt_dev->cur_udp_src >= pkt_dev->udp_src_max)
2486 pkt_dev->cur_udp_src = pkt_dev->udp_src_min;
2487 }
2488 }
2489
2490 if (pkt_dev->udp_dst_min < pkt_dev->udp_dst_max) {
2491 if (pkt_dev->flags & F_UDPDST_RND) {
2492 pkt_dev->cur_udp_dst = get_random_u32_inclusive(pkt_dev->udp_dst_min,
2493 pkt_dev->udp_dst_max - 1);
2494 } else {
2495 pkt_dev->cur_udp_dst++;
2496 if (pkt_dev->cur_udp_dst >= pkt_dev->udp_dst_max)
2497 pkt_dev->cur_udp_dst = pkt_dev->udp_dst_min;
2498 }
2499 }
2500
2501 if (!(pkt_dev->flags & F_IPV6)) {
2502
2503 imn = ntohl(pkt_dev->saddr_min);
2504 imx = ntohl(pkt_dev->saddr_max);
2505 if (imn < imx) {
2506 __u32 t;
2507 if (pkt_dev->flags & F_IPSRC_RND)
2508 t = get_random_u32_inclusive(imn, imx - 1);
2509 else {
2510 t = ntohl(pkt_dev->cur_saddr);
2511 t++;
2512 if (t > imx)
2513 t = imn;
2514
2515 }
2516 pkt_dev->cur_saddr = htonl(t);
2517 }
2518
2519 if (pkt_dev->cflows && f_seen(pkt_dev, flow)) {
2520 pkt_dev->cur_daddr = pkt_dev->flows[flow].cur_daddr;
2521 } else {
2522 imn = ntohl(pkt_dev->daddr_min);
2523 imx = ntohl(pkt_dev->daddr_max);
2524 if (imn < imx) {
2525 __u32 t;
2526 __be32 s;
2527 if (pkt_dev->flags & F_IPDST_RND) {
2528
2529 do {
2530 t = get_random_u32_inclusive(imn, imx - 1);
2531 s = htonl(t);
2532 } while (ipv4_is_loopback(s) ||
2533 ipv4_is_multicast(s) ||
2534 ipv4_is_lbcast(s) ||
2535 ipv4_is_zeronet(s) ||
2536 ipv4_is_local_multicast(s));
2537 pkt_dev->cur_daddr = s;
2538 } else {
2539 t = ntohl(pkt_dev->cur_daddr);
2540 t++;
2541 if (t > imx) {
2542 t = imn;
2543 }
2544 pkt_dev->cur_daddr = htonl(t);
2545 }
2546 }
2547 if (pkt_dev->cflows) {
2548 pkt_dev->flows[flow].flags |= F_INIT;
2549 pkt_dev->flows[flow].cur_daddr =
2550 pkt_dev->cur_daddr;
2551 #ifdef CONFIG_XFRM
2552 if (pkt_dev->flags & F_IPSEC)
2553 get_ipsec_sa(pkt_dev, flow);
2554 #endif
2555 pkt_dev->nflows++;
2556 }
2557 }
2558 } else { /* IPV6 * */
2559
2560 if (!ipv6_addr_any(&pkt_dev->min_in6_daddr)) {
2561 int i;
2562
2563 /* Only random destinations yet */
2564
2565 for (i = 0; i < 4; i++) {
2566 pkt_dev->cur_in6_daddr.s6_addr32[i] =
2567 (((__force __be32)get_random_u32() |
2568 pkt_dev->min_in6_daddr.s6_addr32[i]) &
2569 pkt_dev->max_in6_daddr.s6_addr32[i]);
2570 }
2571 }
2572 }
2573
2574 if (pkt_dev->min_pkt_size < pkt_dev->max_pkt_size) {
2575 __u32 t;
2576 if (pkt_dev->flags & F_TXSIZE_RND) {
2577 t = get_random_u32_inclusive(pkt_dev->min_pkt_size,
2578 pkt_dev->max_pkt_size - 1);
2579 } else {
2580 t = pkt_dev->cur_pkt_size + 1;
2581 if (t > pkt_dev->max_pkt_size)
2582 t = pkt_dev->min_pkt_size;
2583 }
2584 pkt_dev->cur_pkt_size = t;
2585 } else if (pkt_dev->n_imix_entries > 0) {
2586 struct imix_pkt *entry;
2587 __u32 t = get_random_u32_below(IMIX_PRECISION);
2588 __u8 entry_index = pkt_dev->imix_distribution[t];
2589
2590 entry = &pkt_dev->imix_entries[entry_index];
2591 entry->count_so_far++;
2592 pkt_dev->cur_pkt_size = entry->size;
2593 }
2594
2595 set_cur_queue_map(pkt_dev);
2596
2597 pkt_dev->flows[flow].count++;
2598 }
2599
fill_imix_distribution(struct pktgen_dev * pkt_dev)2600 static void fill_imix_distribution(struct pktgen_dev *pkt_dev)
2601 {
2602 int cumulative_probabilites[MAX_IMIX_ENTRIES];
2603 int j = 0;
2604 __u64 cumulative_prob = 0;
2605 __u64 total_weight = 0;
2606 int i = 0;
2607
2608 for (i = 0; i < pkt_dev->n_imix_entries; i++)
2609 total_weight += pkt_dev->imix_entries[i].weight;
2610
2611 /* Fill cumulative_probabilites with sum of normalized probabilities */
2612 for (i = 0; i < pkt_dev->n_imix_entries - 1; i++) {
2613 cumulative_prob += div64_u64(pkt_dev->imix_entries[i].weight *
2614 IMIX_PRECISION,
2615 total_weight);
2616 cumulative_probabilites[i] = cumulative_prob;
2617 }
2618 cumulative_probabilites[pkt_dev->n_imix_entries - 1] = 100;
2619
2620 for (i = 0; i < IMIX_PRECISION; i++) {
2621 if (i == cumulative_probabilites[j])
2622 j++;
2623 pkt_dev->imix_distribution[i] = j;
2624 }
2625 }
2626
2627 #ifdef CONFIG_XFRM
2628 static u32 pktgen_dst_metrics[RTAX_MAX + 1] = {
2629
2630 [RTAX_HOPLIMIT] = 0x5, /* Set a static hoplimit */
2631 };
2632
pktgen_output_ipsec(struct sk_buff * skb,struct pktgen_dev * pkt_dev)2633 static int pktgen_output_ipsec(struct sk_buff *skb, struct pktgen_dev *pkt_dev)
2634 {
2635 struct xfrm_state *x = pkt_dev->flows[pkt_dev->curfl].x;
2636 int err = 0;
2637 struct net *net = dev_net(pkt_dev->odev);
2638
2639 if (!x)
2640 return 0;
2641 /* XXX: we dont support tunnel mode for now until
2642 * we resolve the dst issue */
2643 if ((x->props.mode != XFRM_MODE_TRANSPORT) && (pkt_dev->spi == 0))
2644 return 0;
2645
2646 /* But when user specify an valid SPI, transformation
2647 * supports both transport/tunnel mode + ESP/AH type.
2648 */
2649 if ((x->props.mode == XFRM_MODE_TUNNEL) && (pkt_dev->spi != 0))
2650 skb->_skb_refdst = (unsigned long)&pkt_dev->xdst.u.dst | SKB_DST_NOREF;
2651
2652 rcu_read_lock_bh();
2653 err = pktgen_xfrm_outer_mode_output(x, skb);
2654 rcu_read_unlock_bh();
2655 if (err) {
2656 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTSTATEMODEERROR);
2657 goto error;
2658 }
2659 err = x->type->output(x, skb);
2660 if (err) {
2661 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTSTATEPROTOERROR);
2662 goto error;
2663 }
2664 spin_lock_bh(&x->lock);
2665 x->curlft.bytes += skb->len;
2666 x->curlft.packets++;
2667 spin_unlock_bh(&x->lock);
2668 error:
2669 return err;
2670 }
2671
free_SAs(struct pktgen_dev * pkt_dev)2672 static void free_SAs(struct pktgen_dev *pkt_dev)
2673 {
2674 if (pkt_dev->cflows) {
2675 /* let go of the SAs if we have them */
2676 int i;
2677 for (i = 0; i < pkt_dev->cflows; i++) {
2678 struct xfrm_state *x = pkt_dev->flows[i].x;
2679 if (x) {
2680 xfrm_state_put(x);
2681 pkt_dev->flows[i].x = NULL;
2682 }
2683 }
2684 }
2685 }
2686
process_ipsec(struct pktgen_dev * pkt_dev,struct sk_buff * skb,__be16 protocol)2687 static int process_ipsec(struct pktgen_dev *pkt_dev,
2688 struct sk_buff *skb, __be16 protocol)
2689 {
2690 if (pkt_dev->flags & F_IPSEC) {
2691 struct xfrm_state *x = pkt_dev->flows[pkt_dev->curfl].x;
2692 int nhead = 0;
2693 if (x) {
2694 struct ethhdr *eth;
2695 struct iphdr *iph;
2696 int ret;
2697
2698 nhead = x->props.header_len - skb_headroom(skb);
2699 if (nhead > 0) {
2700 ret = pskb_expand_head(skb, nhead, 0, GFP_ATOMIC);
2701 if (ret < 0) {
2702 pr_err("Error expanding ipsec packet %d\n",
2703 ret);
2704 goto err;
2705 }
2706 }
2707
2708 /* ipsec is not expecting ll header */
2709 skb_pull(skb, ETH_HLEN);
2710 ret = pktgen_output_ipsec(skb, pkt_dev);
2711 if (ret) {
2712 pr_err("Error creating ipsec packet %d\n", ret);
2713 goto err;
2714 }
2715 /* restore ll */
2716 eth = skb_push(skb, ETH_HLEN);
2717 memcpy(eth, pkt_dev->hh, 2 * ETH_ALEN);
2718 eth->h_proto = protocol;
2719
2720 /* Update IPv4 header len as well as checksum value */
2721 iph = ip_hdr(skb);
2722 iph->tot_len = htons(skb->len - ETH_HLEN);
2723 ip_send_check(iph);
2724 }
2725 }
2726 return 1;
2727 err:
2728 kfree_skb(skb);
2729 return 0;
2730 }
2731 #endif
2732
mpls_push(__be32 * mpls,struct pktgen_dev * pkt_dev)2733 static void mpls_push(__be32 *mpls, struct pktgen_dev *pkt_dev)
2734 {
2735 unsigned int i;
2736 for (i = 0; i < pkt_dev->nr_labels; i++)
2737 *mpls++ = pkt_dev->labels[i] & ~MPLS_STACK_BOTTOM;
2738
2739 mpls--;
2740 *mpls |= MPLS_STACK_BOTTOM;
2741 }
2742
build_tci(unsigned int id,unsigned int cfi,unsigned int prio)2743 static inline __be16 build_tci(unsigned int id, unsigned int cfi,
2744 unsigned int prio)
2745 {
2746 return htons(id | (cfi << 12) | (prio << 13));
2747 }
2748
pktgen_finalize_skb(struct pktgen_dev * pkt_dev,struct sk_buff * skb,int datalen)2749 static void pktgen_finalize_skb(struct pktgen_dev *pkt_dev, struct sk_buff *skb,
2750 int datalen)
2751 {
2752 struct timespec64 timestamp;
2753 struct pktgen_hdr *pgh;
2754
2755 pgh = skb_put(skb, sizeof(*pgh));
2756 datalen -= sizeof(*pgh);
2757
2758 if (pkt_dev->nfrags <= 0) {
2759 skb_put_zero(skb, datalen);
2760 } else {
2761 int frags = pkt_dev->nfrags;
2762 int i, len;
2763 int frag_len;
2764
2765
2766 if (frags > MAX_SKB_FRAGS)
2767 frags = MAX_SKB_FRAGS;
2768 len = datalen - frags * PAGE_SIZE;
2769 if (len > 0) {
2770 skb_put_zero(skb, len);
2771 datalen = frags * PAGE_SIZE;
2772 }
2773
2774 i = 0;
2775 frag_len = (datalen/frags) < PAGE_SIZE ?
2776 (datalen/frags) : PAGE_SIZE;
2777 while (datalen > 0) {
2778 if (unlikely(!pkt_dev->page)) {
2779 int node = numa_node_id();
2780
2781 if (pkt_dev->node >= 0 && (pkt_dev->flags & F_NODE))
2782 node = pkt_dev->node;
2783 pkt_dev->page = alloc_pages_node(node, GFP_KERNEL | __GFP_ZERO, 0);
2784 if (!pkt_dev->page)
2785 break;
2786 }
2787 get_page(pkt_dev->page);
2788
2789 /*last fragment, fill rest of data*/
2790 if (i == (frags - 1))
2791 skb_frag_fill_page_desc(&skb_shinfo(skb)->frags[i],
2792 pkt_dev->page, 0,
2793 (datalen < PAGE_SIZE ?
2794 datalen : PAGE_SIZE));
2795 else
2796 skb_frag_fill_page_desc(&skb_shinfo(skb)->frags[i],
2797 pkt_dev->page, 0, frag_len);
2798
2799 datalen -= skb_frag_size(&skb_shinfo(skb)->frags[i]);
2800 skb->len += skb_frag_size(&skb_shinfo(skb)->frags[i]);
2801 skb->data_len += skb_frag_size(&skb_shinfo(skb)->frags[i]);
2802 i++;
2803 skb_shinfo(skb)->nr_frags = i;
2804 }
2805 }
2806
2807 /* Stamp the time, and sequence number,
2808 * convert them to network byte order
2809 */
2810 pgh->pgh_magic = htonl(PKTGEN_MAGIC);
2811 pgh->seq_num = htonl(pkt_dev->seq_num);
2812
2813 if (pkt_dev->flags & F_NO_TIMESTAMP) {
2814 pgh->tv_sec = 0;
2815 pgh->tv_usec = 0;
2816 } else {
2817 /*
2818 * pgh->tv_sec wraps in y2106 when interpreted as unsigned
2819 * as done by wireshark, or y2038 when interpreted as signed.
2820 * This is probably harmless, but if anyone wants to improve
2821 * it, we could introduce a variant that puts 64-bit nanoseconds
2822 * into the respective header bytes.
2823 * This would also be slightly faster to read.
2824 */
2825 ktime_get_real_ts64(×tamp);
2826 pgh->tv_sec = htonl(timestamp.tv_sec);
2827 pgh->tv_usec = htonl(timestamp.tv_nsec / NSEC_PER_USEC);
2828 }
2829 }
2830
pktgen_alloc_skb(struct net_device * dev,struct pktgen_dev * pkt_dev)2831 static struct sk_buff *pktgen_alloc_skb(struct net_device *dev,
2832 struct pktgen_dev *pkt_dev)
2833 {
2834 unsigned int extralen = LL_RESERVED_SPACE(dev);
2835 struct sk_buff *skb = NULL;
2836 unsigned int size;
2837
2838 size = pkt_dev->cur_pkt_size + 64 + extralen + pkt_dev->pkt_overhead;
2839 if (pkt_dev->flags & F_NODE) {
2840 int node = pkt_dev->node >= 0 ? pkt_dev->node : numa_node_id();
2841
2842 skb = __alloc_skb(NET_SKB_PAD + size, GFP_NOWAIT, 0, node);
2843 if (likely(skb)) {
2844 skb_reserve(skb, NET_SKB_PAD);
2845 skb->dev = dev;
2846 }
2847 } else {
2848 skb = __netdev_alloc_skb(dev, size, GFP_NOWAIT);
2849 }
2850
2851 /* the caller pre-fetches from skb->data and reserves for the mac hdr */
2852 if (likely(skb))
2853 skb_reserve(skb, extralen - 16);
2854
2855 return skb;
2856 }
2857
fill_packet_ipv4(struct net_device * odev,struct pktgen_dev * pkt_dev)2858 static struct sk_buff *fill_packet_ipv4(struct net_device *odev,
2859 struct pktgen_dev *pkt_dev)
2860 {
2861 struct sk_buff *skb = NULL;
2862 __u8 *eth;
2863 struct udphdr *udph;
2864 int datalen, iplen;
2865 struct iphdr *iph;
2866 __be16 protocol = htons(ETH_P_IP);
2867 __be32 *mpls;
2868 __be16 *vlan_tci = NULL; /* Encapsulates priority and VLAN ID */
2869 __be16 *vlan_encapsulated_proto = NULL; /* packet type ID field (or len) for VLAN tag */
2870 __be16 *svlan_tci = NULL; /* Encapsulates priority and SVLAN ID */
2871 __be16 *svlan_encapsulated_proto = NULL; /* packet type ID field (or len) for SVLAN tag */
2872 u16 queue_map;
2873
2874 if (pkt_dev->nr_labels)
2875 protocol = htons(ETH_P_MPLS_UC);
2876
2877 if (pkt_dev->vlan_id != 0xffff)
2878 protocol = htons(ETH_P_8021Q);
2879
2880 /* Update any of the values, used when we're incrementing various
2881 * fields.
2882 */
2883 mod_cur_headers(pkt_dev);
2884 queue_map = pkt_dev->cur_queue_map;
2885
2886 skb = pktgen_alloc_skb(odev, pkt_dev);
2887 if (!skb) {
2888 sprintf(pkt_dev->result, "No memory");
2889 return NULL;
2890 }
2891
2892 prefetchw(skb->data);
2893 skb_reserve(skb, 16);
2894
2895 /* Reserve for ethernet and IP header */
2896 eth = skb_push(skb, 14);
2897 mpls = skb_put(skb, pkt_dev->nr_labels * sizeof(__u32));
2898 if (pkt_dev->nr_labels)
2899 mpls_push(mpls, pkt_dev);
2900
2901 if (pkt_dev->vlan_id != 0xffff) {
2902 if (pkt_dev->svlan_id != 0xffff) {
2903 svlan_tci = skb_put(skb, sizeof(__be16));
2904 *svlan_tci = build_tci(pkt_dev->svlan_id,
2905 pkt_dev->svlan_cfi,
2906 pkt_dev->svlan_p);
2907 svlan_encapsulated_proto = skb_put(skb,
2908 sizeof(__be16));
2909 *svlan_encapsulated_proto = htons(ETH_P_8021Q);
2910 }
2911 vlan_tci = skb_put(skb, sizeof(__be16));
2912 *vlan_tci = build_tci(pkt_dev->vlan_id,
2913 pkt_dev->vlan_cfi,
2914 pkt_dev->vlan_p);
2915 vlan_encapsulated_proto = skb_put(skb, sizeof(__be16));
2916 *vlan_encapsulated_proto = htons(ETH_P_IP);
2917 }
2918
2919 skb_reset_mac_header(skb);
2920 skb_set_network_header(skb, skb->len);
2921 iph = skb_put(skb, sizeof(struct iphdr));
2922
2923 skb_set_transport_header(skb, skb->len);
2924 udph = skb_put(skb, sizeof(struct udphdr));
2925 skb_set_queue_mapping(skb, queue_map);
2926 skb->priority = pkt_dev->skb_priority;
2927
2928 memcpy(eth, pkt_dev->hh, 12);
2929 *(__be16 *) & eth[12] = protocol;
2930
2931 /* Eth + IPh + UDPh + mpls */
2932 datalen = pkt_dev->cur_pkt_size - 14 - 20 - 8 -
2933 pkt_dev->pkt_overhead;
2934 if (datalen < 0 || datalen < sizeof(struct pktgen_hdr))
2935 datalen = sizeof(struct pktgen_hdr);
2936
2937 udph->source = htons(pkt_dev->cur_udp_src);
2938 udph->dest = htons(pkt_dev->cur_udp_dst);
2939 udph->len = htons(datalen + 8); /* DATA + udphdr */
2940 udph->check = 0;
2941
2942 iph->ihl = 5;
2943 iph->version = 4;
2944 iph->ttl = 32;
2945 iph->tos = pkt_dev->tos;
2946 iph->protocol = IPPROTO_UDP; /* UDP */
2947 iph->saddr = pkt_dev->cur_saddr;
2948 iph->daddr = pkt_dev->cur_daddr;
2949 iph->id = htons(pkt_dev->ip_id);
2950 pkt_dev->ip_id++;
2951 iph->frag_off = 0;
2952 iplen = 20 + 8 + datalen;
2953 iph->tot_len = htons(iplen);
2954 ip_send_check(iph);
2955 skb->protocol = protocol;
2956 skb->dev = odev;
2957 skb->pkt_type = PACKET_HOST;
2958
2959 pktgen_finalize_skb(pkt_dev, skb, datalen);
2960
2961 if (!(pkt_dev->flags & F_UDPCSUM)) {
2962 skb->ip_summed = CHECKSUM_NONE;
2963 } else if (odev->features & (NETIF_F_HW_CSUM | NETIF_F_IP_CSUM)) {
2964 skb->ip_summed = CHECKSUM_PARTIAL;
2965 skb->csum = 0;
2966 udp4_hwcsum(skb, iph->saddr, iph->daddr);
2967 } else {
2968 __wsum csum = skb_checksum(skb, skb_transport_offset(skb), datalen + 8, 0);
2969
2970 /* add protocol-dependent pseudo-header */
2971 udph->check = csum_tcpudp_magic(iph->saddr, iph->daddr,
2972 datalen + 8, IPPROTO_UDP, csum);
2973
2974 if (udph->check == 0)
2975 udph->check = CSUM_MANGLED_0;
2976 }
2977
2978 #ifdef CONFIG_XFRM
2979 if (!process_ipsec(pkt_dev, skb, protocol))
2980 return NULL;
2981 #endif
2982
2983 return skb;
2984 }
2985
fill_packet_ipv6(struct net_device * odev,struct pktgen_dev * pkt_dev)2986 static struct sk_buff *fill_packet_ipv6(struct net_device *odev,
2987 struct pktgen_dev *pkt_dev)
2988 {
2989 struct sk_buff *skb = NULL;
2990 __u8 *eth;
2991 struct udphdr *udph;
2992 int datalen, udplen;
2993 struct ipv6hdr *iph;
2994 __be16 protocol = htons(ETH_P_IPV6);
2995 __be32 *mpls;
2996 __be16 *vlan_tci = NULL; /* Encapsulates priority and VLAN ID */
2997 __be16 *vlan_encapsulated_proto = NULL; /* packet type ID field (or len) for VLAN tag */
2998 __be16 *svlan_tci = NULL; /* Encapsulates priority and SVLAN ID */
2999 __be16 *svlan_encapsulated_proto = NULL; /* packet type ID field (or len) for SVLAN tag */
3000 u16 queue_map;
3001
3002 if (pkt_dev->nr_labels)
3003 protocol = htons(ETH_P_MPLS_UC);
3004
3005 if (pkt_dev->vlan_id != 0xffff)
3006 protocol = htons(ETH_P_8021Q);
3007
3008 /* Update any of the values, used when we're incrementing various
3009 * fields.
3010 */
3011 mod_cur_headers(pkt_dev);
3012 queue_map = pkt_dev->cur_queue_map;
3013
3014 skb = pktgen_alloc_skb(odev, pkt_dev);
3015 if (!skb) {
3016 sprintf(pkt_dev->result, "No memory");
3017 return NULL;
3018 }
3019
3020 prefetchw(skb->data);
3021 skb_reserve(skb, 16);
3022
3023 /* Reserve for ethernet and IP header */
3024 eth = skb_push(skb, 14);
3025 mpls = skb_put(skb, pkt_dev->nr_labels * sizeof(__u32));
3026 if (pkt_dev->nr_labels)
3027 mpls_push(mpls, pkt_dev);
3028
3029 if (pkt_dev->vlan_id != 0xffff) {
3030 if (pkt_dev->svlan_id != 0xffff) {
3031 svlan_tci = skb_put(skb, sizeof(__be16));
3032 *svlan_tci = build_tci(pkt_dev->svlan_id,
3033 pkt_dev->svlan_cfi,
3034 pkt_dev->svlan_p);
3035 svlan_encapsulated_proto = skb_put(skb,
3036 sizeof(__be16));
3037 *svlan_encapsulated_proto = htons(ETH_P_8021Q);
3038 }
3039 vlan_tci = skb_put(skb, sizeof(__be16));
3040 *vlan_tci = build_tci(pkt_dev->vlan_id,
3041 pkt_dev->vlan_cfi,
3042 pkt_dev->vlan_p);
3043 vlan_encapsulated_proto = skb_put(skb, sizeof(__be16));
3044 *vlan_encapsulated_proto = htons(ETH_P_IPV6);
3045 }
3046
3047 skb_reset_mac_header(skb);
3048 skb_set_network_header(skb, skb->len);
3049 iph = skb_put(skb, sizeof(struct ipv6hdr));
3050
3051 skb_set_transport_header(skb, skb->len);
3052 udph = skb_put(skb, sizeof(struct udphdr));
3053 skb_set_queue_mapping(skb, queue_map);
3054 skb->priority = pkt_dev->skb_priority;
3055
3056 memcpy(eth, pkt_dev->hh, 12);
3057 *(__be16 *) ð[12] = protocol;
3058
3059 /* Eth + IPh + UDPh + mpls */
3060 datalen = pkt_dev->cur_pkt_size - 14 -
3061 sizeof(struct ipv6hdr) - sizeof(struct udphdr) -
3062 pkt_dev->pkt_overhead;
3063
3064 if (datalen < 0 || datalen < sizeof(struct pktgen_hdr)) {
3065 datalen = sizeof(struct pktgen_hdr);
3066 net_info_ratelimited("increased datalen to %d\n", datalen);
3067 }
3068
3069 udplen = datalen + sizeof(struct udphdr);
3070 udph->source = htons(pkt_dev->cur_udp_src);
3071 udph->dest = htons(pkt_dev->cur_udp_dst);
3072 udph->len = htons(udplen);
3073 udph->check = 0;
3074
3075 *(__be32 *) iph = htonl(0x60000000); /* Version + flow */
3076
3077 if (pkt_dev->traffic_class) {
3078 /* Version + traffic class + flow (0) */
3079 *(__be32 *)iph |= htonl(0x60000000 | (pkt_dev->traffic_class << 20));
3080 }
3081
3082 iph->hop_limit = 32;
3083
3084 iph->payload_len = htons(udplen);
3085 iph->nexthdr = IPPROTO_UDP;
3086
3087 iph->daddr = pkt_dev->cur_in6_daddr;
3088 iph->saddr = pkt_dev->cur_in6_saddr;
3089
3090 skb->protocol = protocol;
3091 skb->dev = odev;
3092 skb->pkt_type = PACKET_HOST;
3093
3094 pktgen_finalize_skb(pkt_dev, skb, datalen);
3095
3096 if (!(pkt_dev->flags & F_UDPCSUM)) {
3097 skb->ip_summed = CHECKSUM_NONE;
3098 } else if (odev->features & (NETIF_F_HW_CSUM | NETIF_F_IPV6_CSUM)) {
3099 skb->ip_summed = CHECKSUM_PARTIAL;
3100 skb->csum_start = skb_transport_header(skb) - skb->head;
3101 skb->csum_offset = offsetof(struct udphdr, check);
3102 udph->check = ~csum_ipv6_magic(&iph->saddr, &iph->daddr, udplen, IPPROTO_UDP, 0);
3103 } else {
3104 __wsum csum = skb_checksum(skb, skb_transport_offset(skb), udplen, 0);
3105
3106 /* add protocol-dependent pseudo-header */
3107 udph->check = csum_ipv6_magic(&iph->saddr, &iph->daddr, udplen, IPPROTO_UDP, csum);
3108
3109 if (udph->check == 0)
3110 udph->check = CSUM_MANGLED_0;
3111 }
3112
3113 return skb;
3114 }
3115
fill_packet(struct net_device * odev,struct pktgen_dev * pkt_dev)3116 static struct sk_buff *fill_packet(struct net_device *odev,
3117 struct pktgen_dev *pkt_dev)
3118 {
3119 if (pkt_dev->flags & F_IPV6)
3120 return fill_packet_ipv6(odev, pkt_dev);
3121 else
3122 return fill_packet_ipv4(odev, pkt_dev);
3123 }
3124
pktgen_clear_counters(struct pktgen_dev * pkt_dev)3125 static void pktgen_clear_counters(struct pktgen_dev *pkt_dev)
3126 {
3127 pkt_dev->seq_num = 1;
3128 pkt_dev->idle_acc = 0;
3129 pkt_dev->sofar = 0;
3130 pkt_dev->tx_bytes = 0;
3131 pkt_dev->errors = 0;
3132 }
3133
3134 /* Set up structure for sending pkts, clear counters */
3135
pktgen_run(struct pktgen_thread * t)3136 static void pktgen_run(struct pktgen_thread *t)
3137 {
3138 struct pktgen_dev *pkt_dev;
3139 int started = 0;
3140
3141 func_enter();
3142
3143 rcu_read_lock();
3144 list_for_each_entry_rcu(pkt_dev, &t->if_list, list) {
3145
3146 /*
3147 * setup odev and create initial packet.
3148 */
3149 pktgen_setup_inject(pkt_dev);
3150
3151 if (pkt_dev->odev) {
3152 pktgen_clear_counters(pkt_dev);
3153 pkt_dev->skb = NULL;
3154 pkt_dev->started_at = pkt_dev->next_tx = ktime_get();
3155
3156 set_pkt_overhead(pkt_dev);
3157
3158 strcpy(pkt_dev->result, "Starting");
3159 pkt_dev->running = 1; /* Cranke yeself! */
3160 started++;
3161 } else
3162 strcpy(pkt_dev->result, "Error starting");
3163 }
3164 rcu_read_unlock();
3165 if (started)
3166 t->control &= ~(T_STOP);
3167 }
3168
pktgen_handle_all_threads(struct pktgen_net * pn,u32 flags)3169 static void pktgen_handle_all_threads(struct pktgen_net *pn, u32 flags)
3170 {
3171 struct pktgen_thread *t;
3172
3173 mutex_lock(&pktgen_thread_lock);
3174
3175 list_for_each_entry(t, &pn->pktgen_threads, th_list)
3176 t->control |= (flags);
3177
3178 mutex_unlock(&pktgen_thread_lock);
3179 }
3180
pktgen_stop_all_threads(struct pktgen_net * pn)3181 static void pktgen_stop_all_threads(struct pktgen_net *pn)
3182 {
3183 func_enter();
3184
3185 pktgen_handle_all_threads(pn, T_STOP);
3186 }
3187
thread_is_running(const struct pktgen_thread * t)3188 static int thread_is_running(const struct pktgen_thread *t)
3189 {
3190 const struct pktgen_dev *pkt_dev;
3191
3192 rcu_read_lock();
3193 list_for_each_entry_rcu(pkt_dev, &t->if_list, list)
3194 if (pkt_dev->running) {
3195 rcu_read_unlock();
3196 return 1;
3197 }
3198 rcu_read_unlock();
3199 return 0;
3200 }
3201
pktgen_wait_thread_run(struct pktgen_thread * t)3202 static int pktgen_wait_thread_run(struct pktgen_thread *t)
3203 {
3204 while (thread_is_running(t)) {
3205
3206 /* note: 't' will still be around even after the unlock/lock
3207 * cycle because pktgen_thread threads are only cleared at
3208 * net exit
3209 */
3210 mutex_unlock(&pktgen_thread_lock);
3211 msleep_interruptible(100);
3212 mutex_lock(&pktgen_thread_lock);
3213
3214 if (signal_pending(current))
3215 goto signal;
3216 }
3217 return 1;
3218 signal:
3219 return 0;
3220 }
3221
pktgen_wait_all_threads_run(struct pktgen_net * pn)3222 static int pktgen_wait_all_threads_run(struct pktgen_net *pn)
3223 {
3224 struct pktgen_thread *t;
3225 int sig = 1;
3226
3227 /* prevent from racing with rmmod */
3228 if (!try_module_get(THIS_MODULE))
3229 return sig;
3230
3231 mutex_lock(&pktgen_thread_lock);
3232
3233 list_for_each_entry(t, &pn->pktgen_threads, th_list) {
3234 sig = pktgen_wait_thread_run(t);
3235 if (sig == 0)
3236 break;
3237 }
3238
3239 if (sig == 0)
3240 list_for_each_entry(t, &pn->pktgen_threads, th_list)
3241 t->control |= (T_STOP);
3242
3243 mutex_unlock(&pktgen_thread_lock);
3244 module_put(THIS_MODULE);
3245 return sig;
3246 }
3247
pktgen_run_all_threads(struct pktgen_net * pn)3248 static void pktgen_run_all_threads(struct pktgen_net *pn)
3249 {
3250 func_enter();
3251
3252 pktgen_handle_all_threads(pn, T_RUN);
3253
3254 /* Propagate thread->control */
3255 schedule_timeout_interruptible(msecs_to_jiffies(125));
3256
3257 pktgen_wait_all_threads_run(pn);
3258 }
3259
pktgen_reset_all_threads(struct pktgen_net * pn)3260 static void pktgen_reset_all_threads(struct pktgen_net *pn)
3261 {
3262 func_enter();
3263
3264 pktgen_handle_all_threads(pn, T_REMDEVALL);
3265
3266 /* Propagate thread->control */
3267 schedule_timeout_interruptible(msecs_to_jiffies(125));
3268
3269 pktgen_wait_all_threads_run(pn);
3270 }
3271
show_results(struct pktgen_dev * pkt_dev,int nr_frags)3272 static void show_results(struct pktgen_dev *pkt_dev, int nr_frags)
3273 {
3274 __u64 bps, mbps, pps;
3275 char *p = pkt_dev->result;
3276 ktime_t elapsed = ktime_sub(pkt_dev->stopped_at,
3277 pkt_dev->started_at);
3278 ktime_t idle = ns_to_ktime(pkt_dev->idle_acc);
3279
3280 p += sprintf(p, "OK: %llu(c%llu+d%llu) usec, %llu (%dbyte,%dfrags)\n",
3281 (unsigned long long)ktime_to_us(elapsed),
3282 (unsigned long long)ktime_to_us(ktime_sub(elapsed, idle)),
3283 (unsigned long long)ktime_to_us(idle),
3284 (unsigned long long)pkt_dev->sofar,
3285 pkt_dev->cur_pkt_size, nr_frags);
3286
3287 pps = div64_u64(pkt_dev->sofar * NSEC_PER_SEC,
3288 ktime_to_ns(elapsed));
3289
3290 if (pkt_dev->n_imix_entries > 0) {
3291 int i;
3292 struct imix_pkt *entry;
3293
3294 bps = 0;
3295 for (i = 0; i < pkt_dev->n_imix_entries; i++) {
3296 entry = &pkt_dev->imix_entries[i];
3297 bps += entry->size * entry->count_so_far;
3298 }
3299 bps = div64_u64(bps * 8 * NSEC_PER_SEC, ktime_to_ns(elapsed));
3300 } else {
3301 bps = pps * 8 * pkt_dev->cur_pkt_size;
3302 }
3303
3304 mbps = bps;
3305 do_div(mbps, 1000000);
3306 p += sprintf(p, " %llupps %lluMb/sec (%llubps) errors: %llu",
3307 (unsigned long long)pps,
3308 (unsigned long long)mbps,
3309 (unsigned long long)bps,
3310 (unsigned long long)pkt_dev->errors);
3311 }
3312
3313 /* Set stopped-at timer, remove from running list, do counters & statistics */
pktgen_stop_device(struct pktgen_dev * pkt_dev)3314 static int pktgen_stop_device(struct pktgen_dev *pkt_dev)
3315 {
3316 int nr_frags = pkt_dev->skb ? skb_shinfo(pkt_dev->skb)->nr_frags : -1;
3317
3318 if (!pkt_dev->running) {
3319 pr_warn("interface: %s is already stopped\n",
3320 pkt_dev->odevname);
3321 return -EINVAL;
3322 }
3323
3324 pkt_dev->running = 0;
3325 kfree_skb(pkt_dev->skb);
3326 pkt_dev->skb = NULL;
3327 pkt_dev->stopped_at = ktime_get();
3328
3329 show_results(pkt_dev, nr_frags);
3330
3331 return 0;
3332 }
3333
next_to_run(struct pktgen_thread * t)3334 static struct pktgen_dev *next_to_run(struct pktgen_thread *t)
3335 {
3336 struct pktgen_dev *pkt_dev, *best = NULL;
3337
3338 rcu_read_lock();
3339 list_for_each_entry_rcu(pkt_dev, &t->if_list, list) {
3340 if (!pkt_dev->running)
3341 continue;
3342 if (best == NULL)
3343 best = pkt_dev;
3344 else if (ktime_compare(pkt_dev->next_tx, best->next_tx) < 0)
3345 best = pkt_dev;
3346 }
3347 rcu_read_unlock();
3348
3349 return best;
3350 }
3351
pktgen_stop(struct pktgen_thread * t)3352 static void pktgen_stop(struct pktgen_thread *t)
3353 {
3354 struct pktgen_dev *pkt_dev;
3355
3356 func_enter();
3357
3358 rcu_read_lock();
3359
3360 list_for_each_entry_rcu(pkt_dev, &t->if_list, list) {
3361 pktgen_stop_device(pkt_dev);
3362 }
3363
3364 rcu_read_unlock();
3365 }
3366
3367 /*
3368 * one of our devices needs to be removed - find it
3369 * and remove it
3370 */
pktgen_rem_one_if(struct pktgen_thread * t)3371 static void pktgen_rem_one_if(struct pktgen_thread *t)
3372 {
3373 struct list_head *q, *n;
3374 struct pktgen_dev *cur;
3375
3376 func_enter();
3377
3378 list_for_each_safe(q, n, &t->if_list) {
3379 cur = list_entry(q, struct pktgen_dev, list);
3380
3381 if (!cur->removal_mark)
3382 continue;
3383
3384 kfree_skb(cur->skb);
3385 cur->skb = NULL;
3386
3387 pktgen_remove_device(t, cur);
3388
3389 break;
3390 }
3391 }
3392
pktgen_rem_all_ifs(struct pktgen_thread * t)3393 static void pktgen_rem_all_ifs(struct pktgen_thread *t)
3394 {
3395 struct list_head *q, *n;
3396 struct pktgen_dev *cur;
3397
3398 func_enter();
3399
3400 /* Remove all devices, free mem */
3401
3402 list_for_each_safe(q, n, &t->if_list) {
3403 cur = list_entry(q, struct pktgen_dev, list);
3404
3405 kfree_skb(cur->skb);
3406 cur->skb = NULL;
3407
3408 pktgen_remove_device(t, cur);
3409 }
3410 }
3411
pktgen_rem_thread(struct pktgen_thread * t)3412 static void pktgen_rem_thread(struct pktgen_thread *t)
3413 {
3414 /* Remove from the thread list */
3415 remove_proc_entry(t->tsk->comm, t->net->proc_dir);
3416 }
3417
pktgen_resched(struct pktgen_dev * pkt_dev)3418 static void pktgen_resched(struct pktgen_dev *pkt_dev)
3419 {
3420 ktime_t idle_start = ktime_get();
3421 schedule();
3422 pkt_dev->idle_acc += ktime_to_ns(ktime_sub(ktime_get(), idle_start));
3423 }
3424
pktgen_wait_for_skb(struct pktgen_dev * pkt_dev)3425 static void pktgen_wait_for_skb(struct pktgen_dev *pkt_dev)
3426 {
3427 ktime_t idle_start = ktime_get();
3428
3429 while (refcount_read(&(pkt_dev->skb->users)) != 1) {
3430 if (signal_pending(current))
3431 break;
3432
3433 if (need_resched())
3434 pktgen_resched(pkt_dev);
3435 else
3436 cpu_relax();
3437 }
3438 pkt_dev->idle_acc += ktime_to_ns(ktime_sub(ktime_get(), idle_start));
3439 }
3440
pktgen_xmit(struct pktgen_dev * pkt_dev)3441 static void pktgen_xmit(struct pktgen_dev *pkt_dev)
3442 {
3443 unsigned int burst = READ_ONCE(pkt_dev->burst);
3444 struct net_device *odev = pkt_dev->odev;
3445 struct netdev_queue *txq;
3446 struct sk_buff *skb;
3447 int ret;
3448
3449 /* If device is offline, then don't send */
3450 if (unlikely(!netif_running(odev) || !netif_carrier_ok(odev))) {
3451 pktgen_stop_device(pkt_dev);
3452 return;
3453 }
3454
3455 /* This is max DELAY, this has special meaning of
3456 * "never transmit"
3457 */
3458 if (unlikely(pkt_dev->delay == ULLONG_MAX)) {
3459 pkt_dev->next_tx = ktime_add_ns(ktime_get(), ULONG_MAX);
3460 return;
3461 }
3462
3463 /* If no skb or clone count exhausted then get new one */
3464 if (!pkt_dev->skb || (pkt_dev->last_ok &&
3465 ++pkt_dev->clone_count >= pkt_dev->clone_skb)) {
3466 /* build a new pkt */
3467 kfree_skb(pkt_dev->skb);
3468
3469 pkt_dev->skb = fill_packet(odev, pkt_dev);
3470 if (pkt_dev->skb == NULL) {
3471 pr_err("ERROR: couldn't allocate skb in fill_packet\n");
3472 schedule();
3473 pkt_dev->clone_count--; /* back out increment, OOM */
3474 return;
3475 }
3476 pkt_dev->last_pkt_size = pkt_dev->skb->len;
3477 pkt_dev->clone_count = 0; /* reset counter */
3478 }
3479
3480 if (pkt_dev->delay && pkt_dev->last_ok)
3481 spin(pkt_dev, pkt_dev->next_tx);
3482
3483 if (pkt_dev->xmit_mode == M_NETIF_RECEIVE) {
3484 skb = pkt_dev->skb;
3485 skb->protocol = eth_type_trans(skb, skb->dev);
3486 refcount_add(burst, &skb->users);
3487 local_bh_disable();
3488 do {
3489 ret = netif_receive_skb(skb);
3490 if (ret == NET_RX_DROP)
3491 pkt_dev->errors++;
3492 pkt_dev->sofar++;
3493 pkt_dev->seq_num++;
3494 if (refcount_read(&skb->users) != burst) {
3495 /* skb was queued by rps/rfs or taps,
3496 * so cannot reuse this skb
3497 */
3498 WARN_ON(refcount_sub_and_test(burst - 1, &skb->users));
3499 /* get out of the loop and wait
3500 * until skb is consumed
3501 */
3502 break;
3503 }
3504 /* skb was 'freed' by stack, so clean few
3505 * bits and reuse it
3506 */
3507 skb_reset_redirect(skb);
3508 } while (--burst > 0);
3509 goto out; /* Skips xmit_mode M_START_XMIT */
3510 } else if (pkt_dev->xmit_mode == M_QUEUE_XMIT) {
3511 local_bh_disable();
3512 refcount_inc(&pkt_dev->skb->users);
3513
3514 ret = dev_queue_xmit(pkt_dev->skb);
3515 switch (ret) {
3516 case NET_XMIT_SUCCESS:
3517 pkt_dev->sofar++;
3518 pkt_dev->seq_num++;
3519 pkt_dev->tx_bytes += pkt_dev->last_pkt_size;
3520 break;
3521 case NET_XMIT_DROP:
3522 case NET_XMIT_CN:
3523 /* These are all valid return codes for a qdisc but
3524 * indicate packets are being dropped or will likely
3525 * be dropped soon.
3526 */
3527 case NETDEV_TX_BUSY:
3528 /* qdisc may call dev_hard_start_xmit directly in cases
3529 * where no queues exist e.g. loopback device, virtual
3530 * devices, etc. In this case we need to handle
3531 * NETDEV_TX_ codes.
3532 */
3533 default:
3534 pkt_dev->errors++;
3535 net_info_ratelimited("%s xmit error: %d\n",
3536 pkt_dev->odevname, ret);
3537 break;
3538 }
3539 goto out;
3540 }
3541
3542 txq = skb_get_tx_queue(odev, pkt_dev->skb);
3543
3544 local_bh_disable();
3545
3546 HARD_TX_LOCK(odev, txq, smp_processor_id());
3547
3548 if (unlikely(netif_xmit_frozen_or_drv_stopped(txq))) {
3549 pkt_dev->last_ok = 0;
3550 goto unlock;
3551 }
3552 refcount_add(burst, &pkt_dev->skb->users);
3553
3554 xmit_more:
3555 ret = netdev_start_xmit(pkt_dev->skb, odev, txq, --burst > 0);
3556
3557 switch (ret) {
3558 case NETDEV_TX_OK:
3559 pkt_dev->last_ok = 1;
3560 pkt_dev->sofar++;
3561 pkt_dev->seq_num++;
3562 pkt_dev->tx_bytes += pkt_dev->last_pkt_size;
3563 if (burst > 0 && !netif_xmit_frozen_or_drv_stopped(txq))
3564 goto xmit_more;
3565 break;
3566 case NET_XMIT_DROP:
3567 case NET_XMIT_CN:
3568 /* skb has been consumed */
3569 pkt_dev->errors++;
3570 break;
3571 default: /* Drivers are not supposed to return other values! */
3572 net_info_ratelimited("%s xmit error: %d\n",
3573 pkt_dev->odevname, ret);
3574 pkt_dev->errors++;
3575 fallthrough;
3576 case NETDEV_TX_BUSY:
3577 /* Retry it next time */
3578 refcount_dec(&(pkt_dev->skb->users));
3579 pkt_dev->last_ok = 0;
3580 }
3581 if (unlikely(burst))
3582 WARN_ON(refcount_sub_and_test(burst, &pkt_dev->skb->users));
3583 unlock:
3584 HARD_TX_UNLOCK(odev, txq);
3585
3586 out:
3587 local_bh_enable();
3588
3589 /* If pkt_dev->count is zero, then run forever */
3590 if ((pkt_dev->count != 0) && (pkt_dev->sofar >= pkt_dev->count)) {
3591 pktgen_wait_for_skb(pkt_dev);
3592
3593 /* Done with this */
3594 pktgen_stop_device(pkt_dev);
3595 }
3596 }
3597
3598 /*
3599 * Main loop of the thread goes here
3600 */
3601
pktgen_thread_worker(void * arg)3602 static int pktgen_thread_worker(void *arg)
3603 {
3604 struct pktgen_thread *t = arg;
3605 struct pktgen_dev *pkt_dev = NULL;
3606 int cpu = t->cpu;
3607
3608 WARN_ON(smp_processor_id() != cpu);
3609
3610 init_waitqueue_head(&t->queue);
3611 complete(&t->start_done);
3612
3613 pr_debug("starting pktgen/%d: pid=%d\n", cpu, task_pid_nr(current));
3614
3615 set_freezable();
3616
3617 while (!kthread_should_stop()) {
3618 pkt_dev = next_to_run(t);
3619
3620 if (unlikely(!pkt_dev && t->control == 0)) {
3621 if (t->net->pktgen_exiting)
3622 break;
3623 wait_event_interruptible_timeout(t->queue,
3624 t->control != 0,
3625 HZ/10);
3626 try_to_freeze();
3627 continue;
3628 }
3629
3630 if (likely(pkt_dev)) {
3631 pktgen_xmit(pkt_dev);
3632
3633 if (need_resched())
3634 pktgen_resched(pkt_dev);
3635 else
3636 cpu_relax();
3637 }
3638
3639 if (t->control & T_STOP) {
3640 pktgen_stop(t);
3641 t->control &= ~(T_STOP);
3642 }
3643
3644 if (t->control & T_RUN) {
3645 pktgen_run(t);
3646 t->control &= ~(T_RUN);
3647 }
3648
3649 if (t->control & T_REMDEVALL) {
3650 pktgen_rem_all_ifs(t);
3651 t->control &= ~(T_REMDEVALL);
3652 }
3653
3654 if (t->control & T_REMDEV) {
3655 pktgen_rem_one_if(t);
3656 t->control &= ~(T_REMDEV);
3657 }
3658
3659 try_to_freeze();
3660 }
3661
3662 pr_debug("%s stopping all device\n", t->tsk->comm);
3663 pktgen_stop(t);
3664
3665 pr_debug("%s removing all device\n", t->tsk->comm);
3666 pktgen_rem_all_ifs(t);
3667
3668 pr_debug("%s removing thread\n", t->tsk->comm);
3669 pktgen_rem_thread(t);
3670
3671 return 0;
3672 }
3673
pktgen_find_dev(struct pktgen_thread * t,const char * ifname,bool exact)3674 static struct pktgen_dev *pktgen_find_dev(struct pktgen_thread *t,
3675 const char *ifname, bool exact)
3676 {
3677 struct pktgen_dev *p, *pkt_dev = NULL;
3678 size_t len = strlen(ifname);
3679
3680 rcu_read_lock();
3681 list_for_each_entry_rcu(p, &t->if_list, list)
3682 if (strncmp(p->odevname, ifname, len) == 0) {
3683 if (p->odevname[len]) {
3684 if (exact || p->odevname[len] != '@')
3685 continue;
3686 }
3687 pkt_dev = p;
3688 break;
3689 }
3690
3691 rcu_read_unlock();
3692 pr_debug("find_dev(%s) returning %p\n", ifname, pkt_dev);
3693 return pkt_dev;
3694 }
3695
3696 /*
3697 * Adds a dev at front of if_list.
3698 */
3699
add_dev_to_thread(struct pktgen_thread * t,struct pktgen_dev * pkt_dev)3700 static int add_dev_to_thread(struct pktgen_thread *t,
3701 struct pktgen_dev *pkt_dev)
3702 {
3703 int rv = 0;
3704
3705 /* This function cannot be called concurrently, as its called
3706 * under pktgen_thread_lock mutex, but it can run from
3707 * userspace on another CPU than the kthread. The if_lock()
3708 * is used here to sync with concurrent instances of
3709 * _rem_dev_from_if_list() invoked via kthread, which is also
3710 * updating the if_list */
3711 if_lock(t);
3712
3713 if (pkt_dev->pg_thread) {
3714 pr_err("ERROR: already assigned to a thread\n");
3715 rv = -EBUSY;
3716 goto out;
3717 }
3718
3719 pkt_dev->running = 0;
3720 pkt_dev->pg_thread = t;
3721 list_add_rcu(&pkt_dev->list, &t->if_list);
3722
3723 out:
3724 if_unlock(t);
3725 return rv;
3726 }
3727
3728 /* Called under thread lock */
3729
pktgen_add_device(struct pktgen_thread * t,const char * ifname)3730 static int pktgen_add_device(struct pktgen_thread *t, const char *ifname)
3731 {
3732 struct pktgen_dev *pkt_dev;
3733 int err;
3734 int node = cpu_to_node(t->cpu);
3735
3736 /* We don't allow a device to be on several threads */
3737
3738 pkt_dev = __pktgen_NN_threads(t->net, ifname, FIND);
3739 if (pkt_dev) {
3740 pr_err("ERROR: interface already used\n");
3741 return -EBUSY;
3742 }
3743
3744 pkt_dev = kzalloc_node(sizeof(struct pktgen_dev), GFP_KERNEL, node);
3745 if (!pkt_dev)
3746 return -ENOMEM;
3747
3748 strcpy(pkt_dev->odevname, ifname);
3749 pkt_dev->flows = vzalloc_node(array_size(MAX_CFLOWS,
3750 sizeof(struct flow_state)),
3751 node);
3752 if (pkt_dev->flows == NULL) {
3753 kfree(pkt_dev);
3754 return -ENOMEM;
3755 }
3756
3757 pkt_dev->removal_mark = 0;
3758 pkt_dev->nfrags = 0;
3759 pkt_dev->delay = pg_delay_d;
3760 pkt_dev->count = pg_count_d;
3761 pkt_dev->sofar = 0;
3762 pkt_dev->udp_src_min = 9; /* sink port */
3763 pkt_dev->udp_src_max = 9;
3764 pkt_dev->udp_dst_min = 9;
3765 pkt_dev->udp_dst_max = 9;
3766 pkt_dev->vlan_p = 0;
3767 pkt_dev->vlan_cfi = 0;
3768 pkt_dev->vlan_id = 0xffff;
3769 pkt_dev->svlan_p = 0;
3770 pkt_dev->svlan_cfi = 0;
3771 pkt_dev->svlan_id = 0xffff;
3772 pkt_dev->burst = 1;
3773 pkt_dev->node = NUMA_NO_NODE;
3774
3775 err = pktgen_setup_dev(t->net, pkt_dev, ifname);
3776 if (err)
3777 goto out1;
3778 if (pkt_dev->odev->priv_flags & IFF_TX_SKB_SHARING)
3779 pkt_dev->clone_skb = pg_clone_skb_d;
3780
3781 pkt_dev->entry = proc_create_data(ifname, 0600, t->net->proc_dir,
3782 &pktgen_if_proc_ops, pkt_dev);
3783 if (!pkt_dev->entry) {
3784 pr_err("cannot create %s/%s procfs entry\n",
3785 PG_PROC_DIR, ifname);
3786 err = -EINVAL;
3787 goto out2;
3788 }
3789 #ifdef CONFIG_XFRM
3790 pkt_dev->ipsmode = XFRM_MODE_TRANSPORT;
3791 pkt_dev->ipsproto = IPPROTO_ESP;
3792
3793 /* xfrm tunnel mode needs additional dst to extract outter
3794 * ip header protocol/ttl/id field, here creat a phony one.
3795 * instead of looking for a valid rt, which definitely hurting
3796 * performance under such circumstance.
3797 */
3798 pkt_dev->dstops.family = AF_INET;
3799 pkt_dev->xdst.u.dst.dev = pkt_dev->odev;
3800 dst_init_metrics(&pkt_dev->xdst.u.dst, pktgen_dst_metrics, false);
3801 pkt_dev->xdst.child = &pkt_dev->xdst.u.dst;
3802 pkt_dev->xdst.u.dst.ops = &pkt_dev->dstops;
3803 #endif
3804
3805 return add_dev_to_thread(t, pkt_dev);
3806 out2:
3807 netdev_put(pkt_dev->odev, &pkt_dev->dev_tracker);
3808 out1:
3809 #ifdef CONFIG_XFRM
3810 free_SAs(pkt_dev);
3811 #endif
3812 vfree(pkt_dev->flows);
3813 kfree(pkt_dev);
3814 return err;
3815 }
3816
pktgen_create_thread(int cpu,struct pktgen_net * pn)3817 static int __net_init pktgen_create_thread(int cpu, struct pktgen_net *pn)
3818 {
3819 struct pktgen_thread *t;
3820 struct proc_dir_entry *pe;
3821 struct task_struct *p;
3822
3823 t = kzalloc_node(sizeof(struct pktgen_thread), GFP_KERNEL,
3824 cpu_to_node(cpu));
3825 if (!t) {
3826 pr_err("ERROR: out of memory, can't create new thread\n");
3827 return -ENOMEM;
3828 }
3829
3830 mutex_init(&t->if_lock);
3831 t->cpu = cpu;
3832
3833 INIT_LIST_HEAD(&t->if_list);
3834
3835 list_add_tail(&t->th_list, &pn->pktgen_threads);
3836 init_completion(&t->start_done);
3837
3838 p = kthread_create_on_node(pktgen_thread_worker,
3839 t,
3840 cpu_to_node(cpu),
3841 "kpktgend_%d", cpu);
3842 if (IS_ERR(p)) {
3843 pr_err("kthread_create_on_node() failed for cpu %d\n", t->cpu);
3844 list_del(&t->th_list);
3845 kfree(t);
3846 return PTR_ERR(p);
3847 }
3848 kthread_bind(p, cpu);
3849 t->tsk = p;
3850
3851 pe = proc_create_data(t->tsk->comm, 0600, pn->proc_dir,
3852 &pktgen_thread_proc_ops, t);
3853 if (!pe) {
3854 pr_err("cannot create %s/%s procfs entry\n",
3855 PG_PROC_DIR, t->tsk->comm);
3856 kthread_stop(p);
3857 list_del(&t->th_list);
3858 kfree(t);
3859 return -EINVAL;
3860 }
3861
3862 t->net = pn;
3863 get_task_struct(p);
3864 wake_up_process(p);
3865 wait_for_completion(&t->start_done);
3866
3867 return 0;
3868 }
3869
3870 /*
3871 * Removes a device from the thread if_list.
3872 */
_rem_dev_from_if_list(struct pktgen_thread * t,struct pktgen_dev * pkt_dev)3873 static void _rem_dev_from_if_list(struct pktgen_thread *t,
3874 struct pktgen_dev *pkt_dev)
3875 {
3876 struct list_head *q, *n;
3877 struct pktgen_dev *p;
3878
3879 if_lock(t);
3880 list_for_each_safe(q, n, &t->if_list) {
3881 p = list_entry(q, struct pktgen_dev, list);
3882 if (p == pkt_dev)
3883 list_del_rcu(&p->list);
3884 }
3885 if_unlock(t);
3886 }
3887
pktgen_remove_device(struct pktgen_thread * t,struct pktgen_dev * pkt_dev)3888 static int pktgen_remove_device(struct pktgen_thread *t,
3889 struct pktgen_dev *pkt_dev)
3890 {
3891 pr_debug("remove_device pkt_dev=%p\n", pkt_dev);
3892
3893 if (pkt_dev->running) {
3894 pr_warn("WARNING: trying to remove a running interface, stopping it now\n");
3895 pktgen_stop_device(pkt_dev);
3896 }
3897
3898 /* Dis-associate from the interface */
3899
3900 if (pkt_dev->odev) {
3901 netdev_put(pkt_dev->odev, &pkt_dev->dev_tracker);
3902 pkt_dev->odev = NULL;
3903 }
3904
3905 /* Remove proc before if_list entry, because add_device uses
3906 * list to determine if interface already exist, avoid race
3907 * with proc_create_data() */
3908 proc_remove(pkt_dev->entry);
3909
3910 /* And update the thread if_list */
3911 _rem_dev_from_if_list(t, pkt_dev);
3912
3913 #ifdef CONFIG_XFRM
3914 free_SAs(pkt_dev);
3915 #endif
3916 vfree(pkt_dev->flows);
3917 if (pkt_dev->page)
3918 put_page(pkt_dev->page);
3919 kfree_rcu(pkt_dev, rcu);
3920 return 0;
3921 }
3922
pg_net_init(struct net * net)3923 static int __net_init pg_net_init(struct net *net)
3924 {
3925 struct pktgen_net *pn = net_generic(net, pg_net_id);
3926 struct proc_dir_entry *pe;
3927 int cpu, ret = 0;
3928
3929 pn->net = net;
3930 INIT_LIST_HEAD(&pn->pktgen_threads);
3931 pn->pktgen_exiting = false;
3932 pn->proc_dir = proc_mkdir(PG_PROC_DIR, pn->net->proc_net);
3933 if (!pn->proc_dir) {
3934 pr_warn("cannot create /proc/net/%s\n", PG_PROC_DIR);
3935 return -ENODEV;
3936 }
3937 pe = proc_create(PGCTRL, 0600, pn->proc_dir, &pktgen_proc_ops);
3938 if (pe == NULL) {
3939 pr_err("cannot create %s procfs entry\n", PGCTRL);
3940 ret = -EINVAL;
3941 goto remove;
3942 }
3943
3944 for_each_online_cpu(cpu) {
3945 int err;
3946
3947 err = pktgen_create_thread(cpu, pn);
3948 if (err)
3949 pr_warn("Cannot create thread for cpu %d (%d)\n",
3950 cpu, err);
3951 }
3952
3953 if (list_empty(&pn->pktgen_threads)) {
3954 pr_err("Initialization failed for all threads\n");
3955 ret = -ENODEV;
3956 goto remove_entry;
3957 }
3958
3959 return 0;
3960
3961 remove_entry:
3962 remove_proc_entry(PGCTRL, pn->proc_dir);
3963 remove:
3964 remove_proc_entry(PG_PROC_DIR, pn->net->proc_net);
3965 return ret;
3966 }
3967
pg_net_exit(struct net * net)3968 static void __net_exit pg_net_exit(struct net *net)
3969 {
3970 struct pktgen_net *pn = net_generic(net, pg_net_id);
3971 struct pktgen_thread *t;
3972 struct list_head *q, *n;
3973 LIST_HEAD(list);
3974
3975 /* Stop all interfaces & threads */
3976 pn->pktgen_exiting = true;
3977
3978 mutex_lock(&pktgen_thread_lock);
3979 list_splice_init(&pn->pktgen_threads, &list);
3980 mutex_unlock(&pktgen_thread_lock);
3981
3982 list_for_each_safe(q, n, &list) {
3983 t = list_entry(q, struct pktgen_thread, th_list);
3984 list_del(&t->th_list);
3985 kthread_stop(t->tsk);
3986 put_task_struct(t->tsk);
3987 kfree(t);
3988 }
3989
3990 remove_proc_entry(PGCTRL, pn->proc_dir);
3991 remove_proc_entry(PG_PROC_DIR, pn->net->proc_net);
3992 }
3993
3994 static struct pernet_operations pg_net_ops = {
3995 .init = pg_net_init,
3996 .exit = pg_net_exit,
3997 .id = &pg_net_id,
3998 .size = sizeof(struct pktgen_net),
3999 };
4000
pg_init(void)4001 static int __init pg_init(void)
4002 {
4003 int ret = 0;
4004
4005 pr_info("%s", version);
4006 ret = register_pernet_subsys(&pg_net_ops);
4007 if (ret)
4008 return ret;
4009 ret = register_netdevice_notifier(&pktgen_notifier_block);
4010 if (ret)
4011 unregister_pernet_subsys(&pg_net_ops);
4012
4013 return ret;
4014 }
4015
pg_cleanup(void)4016 static void __exit pg_cleanup(void)
4017 {
4018 unregister_netdevice_notifier(&pktgen_notifier_block);
4019 unregister_pernet_subsys(&pg_net_ops);
4020 /* Don't need rcu_barrier() due to use of kfree_rcu() */
4021 }
4022
4023 module_init(pg_init);
4024 module_exit(pg_cleanup);
4025
4026 MODULE_AUTHOR("Robert Olsson <robert.olsson@its.uu.se>");
4027 MODULE_DESCRIPTION("Packet Generator tool");
4028 MODULE_LICENSE("GPL");
4029 MODULE_VERSION(VERSION);
4030 module_param(pg_count_d, int, 0);
4031 MODULE_PARM_DESC(pg_count_d, "Default number of packets to inject");
4032 module_param(pg_delay_d, int, 0);
4033 MODULE_PARM_DESC(pg_delay_d, "Default delay between packets (nanoseconds)");
4034 module_param(pg_clone_skb_d, int, 0);
4035 MODULE_PARM_DESC(pg_clone_skb_d, "Default number of copies of the same packet");
4036 module_param(debug, int, 0);
4037 MODULE_PARM_DESC(debug, "Enable debugging of pktgen module");
4038
