1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * drivers/net/bond/bond_options.c - bonding options
4  * Copyright (c) 2013 Jiri Pirko <jiri@resnulli.us>
5  * Copyright (c) 2013 Scott Feldman <sfeldma@cumulusnetworks.com>
6  */
7 
8 #include <linux/errno.h>
9 #include <linux/if.h>
10 #include <linux/netdevice.h>
11 #include <linux/spinlock.h>
12 #include <linux/rcupdate.h>
13 #include <linux/ctype.h>
14 #include <linux/inet.h>
15 #include <linux/sched/signal.h>
16 
17 #include <net/bonding.h>
18 
19 static int bond_option_active_slave_set(struct bonding *bond,
20 					const struct bond_opt_value *newval);
21 static int bond_option_miimon_set(struct bonding *bond,
22 				  const struct bond_opt_value *newval);
23 static int bond_option_updelay_set(struct bonding *bond,
24 				   const struct bond_opt_value *newval);
25 static int bond_option_downdelay_set(struct bonding *bond,
26 				     const struct bond_opt_value *newval);
27 static int bond_option_peer_notif_delay_set(struct bonding *bond,
28 					    const struct bond_opt_value *newval);
29 static int bond_option_use_carrier_set(struct bonding *bond,
30 				       const struct bond_opt_value *newval);
31 static int bond_option_arp_interval_set(struct bonding *bond,
32 					const struct bond_opt_value *newval);
33 static int bond_option_arp_ip_target_add(struct bonding *bond, __be32 target);
34 static int bond_option_arp_ip_target_rem(struct bonding *bond, __be32 target);
35 static int bond_option_arp_ip_targets_set(struct bonding *bond,
36 					  const struct bond_opt_value *newval);
37 static int bond_option_arp_validate_set(struct bonding *bond,
38 					const struct bond_opt_value *newval);
39 static int bond_option_arp_all_targets_set(struct bonding *bond,
40 					   const struct bond_opt_value *newval);
41 static int bond_option_primary_set(struct bonding *bond,
42 				   const struct bond_opt_value *newval);
43 static int bond_option_primary_reselect_set(struct bonding *bond,
44 					    const struct bond_opt_value *newval);
45 static int bond_option_fail_over_mac_set(struct bonding *bond,
46 					 const struct bond_opt_value *newval);
47 static int bond_option_xmit_hash_policy_set(struct bonding *bond,
48 					    const struct bond_opt_value *newval);
49 static int bond_option_resend_igmp_set(struct bonding *bond,
50 				       const struct bond_opt_value *newval);
51 static int bond_option_num_peer_notif_set(struct bonding *bond,
52 					  const struct bond_opt_value *newval);
53 static int bond_option_all_slaves_active_set(struct bonding *bond,
54 					     const struct bond_opt_value *newval);
55 static int bond_option_min_links_set(struct bonding *bond,
56 				     const struct bond_opt_value *newval);
57 static int bond_option_lp_interval_set(struct bonding *bond,
58 				       const struct bond_opt_value *newval);
59 static int bond_option_pps_set(struct bonding *bond,
60 			       const struct bond_opt_value *newval);
61 static int bond_option_lacp_rate_set(struct bonding *bond,
62 				     const struct bond_opt_value *newval);
63 static int bond_option_ad_select_set(struct bonding *bond,
64 				     const struct bond_opt_value *newval);
65 static int bond_option_queue_id_set(struct bonding *bond,
66 				    const struct bond_opt_value *newval);
67 static int bond_option_mode_set(struct bonding *bond,
68 				const struct bond_opt_value *newval);
69 static int bond_option_slaves_set(struct bonding *bond,
70 				  const struct bond_opt_value *newval);
71 static int bond_option_tlb_dynamic_lb_set(struct bonding *bond,
72 				  const struct bond_opt_value *newval);
73 static int bond_option_ad_actor_sys_prio_set(struct bonding *bond,
74 					     const struct bond_opt_value *newval);
75 static int bond_option_ad_actor_system_set(struct bonding *bond,
76 					   const struct bond_opt_value *newval);
77 static int bond_option_ad_user_port_key_set(struct bonding *bond,
78 					    const struct bond_opt_value *newval);
79 
80 
81 static const struct bond_opt_value bond_mode_tbl[] = {
82 	{ "balance-rr",    BOND_MODE_ROUNDROBIN,   BOND_VALFLAG_DEFAULT},
83 	{ "active-backup", BOND_MODE_ACTIVEBACKUP, 0},
84 	{ "balance-xor",   BOND_MODE_XOR,          0},
85 	{ "broadcast",     BOND_MODE_BROADCAST,    0},
86 	{ "802.3ad",       BOND_MODE_8023AD,       0},
87 	{ "balance-tlb",   BOND_MODE_TLB,          0},
88 	{ "balance-alb",   BOND_MODE_ALB,          0},
89 	{ NULL,            -1,                     0},
90 };
91 
92 static const struct bond_opt_value bond_pps_tbl[] = {
93 	{ "default", 1,         BOND_VALFLAG_DEFAULT},
94 	{ "maxval",  USHRT_MAX, BOND_VALFLAG_MAX},
95 	{ NULL,      -1,        0},
96 };
97 
98 static const struct bond_opt_value bond_xmit_hashtype_tbl[] = {
99 	{ "layer2",      BOND_XMIT_POLICY_LAYER2,      BOND_VALFLAG_DEFAULT},
100 	{ "layer3+4",    BOND_XMIT_POLICY_LAYER34,     0},
101 	{ "layer2+3",    BOND_XMIT_POLICY_LAYER23,     0},
102 	{ "encap2+3",    BOND_XMIT_POLICY_ENCAP23,     0},
103 	{ "encap3+4",    BOND_XMIT_POLICY_ENCAP34,     0},
104 	{ "vlan+srcmac", BOND_XMIT_POLICY_VLAN_SRCMAC, 0},
105 	{ NULL,          -1,                           0},
106 };
107 
108 static const struct bond_opt_value bond_arp_validate_tbl[] = {
109 	{ "none",		BOND_ARP_VALIDATE_NONE,		BOND_VALFLAG_DEFAULT},
110 	{ "active",		BOND_ARP_VALIDATE_ACTIVE,	0},
111 	{ "backup",		BOND_ARP_VALIDATE_BACKUP,	0},
112 	{ "all",		BOND_ARP_VALIDATE_ALL,		0},
113 	{ "filter",		BOND_ARP_FILTER,		0},
114 	{ "filter_active",	BOND_ARP_FILTER_ACTIVE,		0},
115 	{ "filter_backup",	BOND_ARP_FILTER_BACKUP,		0},
116 	{ NULL,			-1,				0},
117 };
118 
119 static const struct bond_opt_value bond_arp_all_targets_tbl[] = {
120 	{ "any", BOND_ARP_TARGETS_ANY, BOND_VALFLAG_DEFAULT},
121 	{ "all", BOND_ARP_TARGETS_ALL, 0},
122 	{ NULL,  -1,                   0},
123 };
124 
125 static const struct bond_opt_value bond_fail_over_mac_tbl[] = {
126 	{ "none",   BOND_FOM_NONE,   BOND_VALFLAG_DEFAULT},
127 	{ "active", BOND_FOM_ACTIVE, 0},
128 	{ "follow", BOND_FOM_FOLLOW, 0},
129 	{ NULL,     -1,              0},
130 };
131 
132 static const struct bond_opt_value bond_intmax_tbl[] = {
133 	{ "off",     0,       BOND_VALFLAG_DEFAULT},
134 	{ "maxval",  INT_MAX, BOND_VALFLAG_MAX},
135 	{ NULL,      -1,      0}
136 };
137 
138 static const struct bond_opt_value bond_lacp_rate_tbl[] = {
139 	{ "slow", AD_LACP_SLOW, 0},
140 	{ "fast", AD_LACP_FAST, 0},
141 	{ NULL,   -1,           0},
142 };
143 
144 static const struct bond_opt_value bond_ad_select_tbl[] = {
145 	{ "stable",    BOND_AD_STABLE,    BOND_VALFLAG_DEFAULT},
146 	{ "bandwidth", BOND_AD_BANDWIDTH, 0},
147 	{ "count",     BOND_AD_COUNT,     0},
148 	{ NULL,        -1,                0},
149 };
150 
151 static const struct bond_opt_value bond_num_peer_notif_tbl[] = {
152 	{ "off",     0,   0},
153 	{ "maxval",  255, BOND_VALFLAG_MAX},
154 	{ "default", 1,   BOND_VALFLAG_DEFAULT},
155 	{ NULL,      -1,  0}
156 };
157 
158 static const struct bond_opt_value bond_primary_reselect_tbl[] = {
159 	{ "always",  BOND_PRI_RESELECT_ALWAYS,  BOND_VALFLAG_DEFAULT},
160 	{ "better",  BOND_PRI_RESELECT_BETTER,  0},
161 	{ "failure", BOND_PRI_RESELECT_FAILURE, 0},
162 	{ NULL,      -1},
163 };
164 
165 static const struct bond_opt_value bond_use_carrier_tbl[] = {
166 	{ "off", 0,  0},
167 	{ "on",  1,  BOND_VALFLAG_DEFAULT},
168 	{ NULL,  -1, 0}
169 };
170 
171 static const struct bond_opt_value bond_all_slaves_active_tbl[] = {
172 	{ "off", 0,  BOND_VALFLAG_DEFAULT},
173 	{ "on",  1,  0},
174 	{ NULL,  -1, 0}
175 };
176 
177 static const struct bond_opt_value bond_resend_igmp_tbl[] = {
178 	{ "off",     0,   0},
179 	{ "maxval",  255, BOND_VALFLAG_MAX},
180 	{ "default", 1,   BOND_VALFLAG_DEFAULT},
181 	{ NULL,      -1,  0}
182 };
183 
184 static const struct bond_opt_value bond_lp_interval_tbl[] = {
185 	{ "minval",  1,       BOND_VALFLAG_MIN | BOND_VALFLAG_DEFAULT},
186 	{ "maxval",  INT_MAX, BOND_VALFLAG_MAX},
187 	{ NULL,      -1,      0},
188 };
189 
190 static const struct bond_opt_value bond_tlb_dynamic_lb_tbl[] = {
191 	{ "off", 0,  0},
192 	{ "on",  1,  BOND_VALFLAG_DEFAULT},
193 	{ NULL,  -1, 0}
194 };
195 
196 static const struct bond_opt_value bond_ad_actor_sys_prio_tbl[] = {
197 	{ "minval",  1,     BOND_VALFLAG_MIN},
198 	{ "maxval",  65535, BOND_VALFLAG_MAX | BOND_VALFLAG_DEFAULT},
199 	{ NULL,      -1,    0},
200 };
201 
202 static const struct bond_opt_value bond_ad_user_port_key_tbl[] = {
203 	{ "minval",  0,     BOND_VALFLAG_MIN | BOND_VALFLAG_DEFAULT},
204 	{ "maxval",  1023,  BOND_VALFLAG_MAX},
205 	{ NULL,      -1,    0},
206 };
207 
208 static const struct bond_option bond_opts[BOND_OPT_LAST] = {
209 	[BOND_OPT_MODE] = {
210 		.id = BOND_OPT_MODE,
211 		.name = "mode",
212 		.desc = "bond device mode",
213 		.flags = BOND_OPTFLAG_NOSLAVES | BOND_OPTFLAG_IFDOWN,
214 		.values = bond_mode_tbl,
215 		.set = bond_option_mode_set
216 	},
217 	[BOND_OPT_PACKETS_PER_SLAVE] = {
218 		.id = BOND_OPT_PACKETS_PER_SLAVE,
219 		.name = "packets_per_slave",
220 		.desc = "Packets to send per slave in RR mode",
221 		.unsuppmodes = BOND_MODE_ALL_EX(BIT(BOND_MODE_ROUNDROBIN)),
222 		.values = bond_pps_tbl,
223 		.set = bond_option_pps_set
224 	},
225 	[BOND_OPT_XMIT_HASH] = {
226 		.id = BOND_OPT_XMIT_HASH,
227 		.name = "xmit_hash_policy",
228 		.desc = "balance-xor, 802.3ad, and tlb hashing method",
229 		.values = bond_xmit_hashtype_tbl,
230 		.set = bond_option_xmit_hash_policy_set
231 	},
232 	[BOND_OPT_ARP_VALIDATE] = {
233 		.id = BOND_OPT_ARP_VALIDATE,
234 		.name = "arp_validate",
235 		.desc = "validate src/dst of ARP probes",
236 		.unsuppmodes = BIT(BOND_MODE_8023AD) | BIT(BOND_MODE_TLB) |
237 			       BIT(BOND_MODE_ALB),
238 		.values = bond_arp_validate_tbl,
239 		.set = bond_option_arp_validate_set
240 	},
241 	[BOND_OPT_ARP_ALL_TARGETS] = {
242 		.id = BOND_OPT_ARP_ALL_TARGETS,
243 		.name = "arp_all_targets",
244 		.desc = "fail on any/all arp targets timeout",
245 		.values = bond_arp_all_targets_tbl,
246 		.set = bond_option_arp_all_targets_set
247 	},
248 	[BOND_OPT_FAIL_OVER_MAC] = {
249 		.id = BOND_OPT_FAIL_OVER_MAC,
250 		.name = "fail_over_mac",
251 		.desc = "For active-backup, do not set all slaves to the same MAC",
252 		.flags = BOND_OPTFLAG_NOSLAVES,
253 		.values = bond_fail_over_mac_tbl,
254 		.set = bond_option_fail_over_mac_set
255 	},
256 	[BOND_OPT_ARP_INTERVAL] = {
257 		.id = BOND_OPT_ARP_INTERVAL,
258 		.name = "arp_interval",
259 		.desc = "arp interval in milliseconds",
260 		.unsuppmodes = BIT(BOND_MODE_8023AD) | BIT(BOND_MODE_TLB) |
261 			       BIT(BOND_MODE_ALB),
262 		.values = bond_intmax_tbl,
263 		.set = bond_option_arp_interval_set
264 	},
265 	[BOND_OPT_ARP_TARGETS] = {
266 		.id = BOND_OPT_ARP_TARGETS,
267 		.name = "arp_ip_target",
268 		.desc = "arp targets in n.n.n.n form",
269 		.flags = BOND_OPTFLAG_RAWVAL,
270 		.set = bond_option_arp_ip_targets_set
271 	},
272 	[BOND_OPT_DOWNDELAY] = {
273 		.id = BOND_OPT_DOWNDELAY,
274 		.name = "downdelay",
275 		.desc = "Delay before considering link down, in milliseconds",
276 		.values = bond_intmax_tbl,
277 		.set = bond_option_downdelay_set
278 	},
279 	[BOND_OPT_UPDELAY] = {
280 		.id = BOND_OPT_UPDELAY,
281 		.name = "updelay",
282 		.desc = "Delay before considering link up, in milliseconds",
283 		.values = bond_intmax_tbl,
284 		.set = bond_option_updelay_set
285 	},
286 	[BOND_OPT_LACP_RATE] = {
287 		.id = BOND_OPT_LACP_RATE,
288 		.name = "lacp_rate",
289 		.desc = "LACPDU tx rate to request from 802.3ad partner",
290 		.flags = BOND_OPTFLAG_IFDOWN,
291 		.unsuppmodes = BOND_MODE_ALL_EX(BIT(BOND_MODE_8023AD)),
292 		.values = bond_lacp_rate_tbl,
293 		.set = bond_option_lacp_rate_set
294 	},
295 	[BOND_OPT_MINLINKS] = {
296 		.id = BOND_OPT_MINLINKS,
297 		.name = "min_links",
298 		.desc = "Minimum number of available links before turning on carrier",
299 		.values = bond_intmax_tbl,
300 		.set = bond_option_min_links_set
301 	},
302 	[BOND_OPT_AD_SELECT] = {
303 		.id = BOND_OPT_AD_SELECT,
304 		.name = "ad_select",
305 		.desc = "803.ad aggregation selection logic",
306 		.flags = BOND_OPTFLAG_IFDOWN,
307 		.values = bond_ad_select_tbl,
308 		.set = bond_option_ad_select_set
309 	},
310 	[BOND_OPT_NUM_PEER_NOTIF] = {
311 		.id = BOND_OPT_NUM_PEER_NOTIF,
312 		.name = "num_unsol_na",
313 		.desc = "Number of peer notifications to send on failover event",
314 		.values = bond_num_peer_notif_tbl,
315 		.set = bond_option_num_peer_notif_set
316 	},
317 	[BOND_OPT_MIIMON] = {
318 		.id = BOND_OPT_MIIMON,
319 		.name = "miimon",
320 		.desc = "Link check interval in milliseconds",
321 		.values = bond_intmax_tbl,
322 		.set = bond_option_miimon_set
323 	},
324 	[BOND_OPT_PRIMARY] = {
325 		.id = BOND_OPT_PRIMARY,
326 		.name = "primary",
327 		.desc = "Primary network device to use",
328 		.flags = BOND_OPTFLAG_RAWVAL,
329 		.unsuppmodes = BOND_MODE_ALL_EX(BIT(BOND_MODE_ACTIVEBACKUP) |
330 						BIT(BOND_MODE_TLB) |
331 						BIT(BOND_MODE_ALB)),
332 		.set = bond_option_primary_set
333 	},
334 	[BOND_OPT_PRIMARY_RESELECT] = {
335 		.id = BOND_OPT_PRIMARY_RESELECT,
336 		.name = "primary_reselect",
337 		.desc = "Reselect primary slave once it comes up",
338 		.values = bond_primary_reselect_tbl,
339 		.set = bond_option_primary_reselect_set
340 	},
341 	[BOND_OPT_USE_CARRIER] = {
342 		.id = BOND_OPT_USE_CARRIER,
343 		.name = "use_carrier",
344 		.desc = "Use netif_carrier_ok (vs MII ioctls) in miimon",
345 		.values = bond_use_carrier_tbl,
346 		.set = bond_option_use_carrier_set
347 	},
348 	[BOND_OPT_ACTIVE_SLAVE] = {
349 		.id = BOND_OPT_ACTIVE_SLAVE,
350 		.name = "active_slave",
351 		.desc = "Currently active slave",
352 		.flags = BOND_OPTFLAG_RAWVAL,
353 		.unsuppmodes = BOND_MODE_ALL_EX(BIT(BOND_MODE_ACTIVEBACKUP) |
354 						BIT(BOND_MODE_TLB) |
355 						BIT(BOND_MODE_ALB)),
356 		.set = bond_option_active_slave_set
357 	},
358 	[BOND_OPT_QUEUE_ID] = {
359 		.id = BOND_OPT_QUEUE_ID,
360 		.name = "queue_id",
361 		.desc = "Set queue id of a slave",
362 		.flags = BOND_OPTFLAG_RAWVAL,
363 		.set = bond_option_queue_id_set
364 	},
365 	[BOND_OPT_ALL_SLAVES_ACTIVE] = {
366 		.id = BOND_OPT_ALL_SLAVES_ACTIVE,
367 		.name = "all_slaves_active",
368 		.desc = "Keep all frames received on an interface by setting active flag for all slaves",
369 		.values = bond_all_slaves_active_tbl,
370 		.set = bond_option_all_slaves_active_set
371 	},
372 	[BOND_OPT_RESEND_IGMP] = {
373 		.id = BOND_OPT_RESEND_IGMP,
374 		.name = "resend_igmp",
375 		.desc = "Number of IGMP membership reports to send on link failure",
376 		.values = bond_resend_igmp_tbl,
377 		.set = bond_option_resend_igmp_set
378 	},
379 	[BOND_OPT_LP_INTERVAL] = {
380 		.id = BOND_OPT_LP_INTERVAL,
381 		.name = "lp_interval",
382 		.desc = "The number of seconds between instances where the bonding driver sends learning packets to each slave's peer switch",
383 		.values = bond_lp_interval_tbl,
384 		.set = bond_option_lp_interval_set
385 	},
386 	[BOND_OPT_SLAVES] = {
387 		.id = BOND_OPT_SLAVES,
388 		.name = "slaves",
389 		.desc = "Slave membership management",
390 		.flags = BOND_OPTFLAG_RAWVAL,
391 		.set = bond_option_slaves_set
392 	},
393 	[BOND_OPT_TLB_DYNAMIC_LB] = {
394 		.id = BOND_OPT_TLB_DYNAMIC_LB,
395 		.name = "tlb_dynamic_lb",
396 		.desc = "Enable dynamic flow shuffling",
397 		.unsuppmodes = BOND_MODE_ALL_EX(BIT(BOND_MODE_TLB) | BIT(BOND_MODE_ALB)),
398 		.values = bond_tlb_dynamic_lb_tbl,
399 		.flags = BOND_OPTFLAG_IFDOWN,
400 		.set = bond_option_tlb_dynamic_lb_set,
401 	},
402 	[BOND_OPT_AD_ACTOR_SYS_PRIO] = {
403 		.id = BOND_OPT_AD_ACTOR_SYS_PRIO,
404 		.name = "ad_actor_sys_prio",
405 		.unsuppmodes = BOND_MODE_ALL_EX(BIT(BOND_MODE_8023AD)),
406 		.values = bond_ad_actor_sys_prio_tbl,
407 		.set = bond_option_ad_actor_sys_prio_set,
408 	},
409 	[BOND_OPT_AD_ACTOR_SYSTEM] = {
410 		.id = BOND_OPT_AD_ACTOR_SYSTEM,
411 		.name = "ad_actor_system",
412 		.unsuppmodes = BOND_MODE_ALL_EX(BIT(BOND_MODE_8023AD)),
413 		.flags = BOND_OPTFLAG_RAWVAL,
414 		.set = bond_option_ad_actor_system_set,
415 	},
416 	[BOND_OPT_AD_USER_PORT_KEY] = {
417 		.id = BOND_OPT_AD_USER_PORT_KEY,
418 		.name = "ad_user_port_key",
419 		.unsuppmodes = BOND_MODE_ALL_EX(BIT(BOND_MODE_8023AD)),
420 		.flags = BOND_OPTFLAG_IFDOWN,
421 		.values = bond_ad_user_port_key_tbl,
422 		.set = bond_option_ad_user_port_key_set,
423 	},
424 	[BOND_OPT_NUM_PEER_NOTIF_ALIAS] = {
425 		.id = BOND_OPT_NUM_PEER_NOTIF_ALIAS,
426 		.name = "num_grat_arp",
427 		.desc = "Number of peer notifications to send on failover event",
428 		.values = bond_num_peer_notif_tbl,
429 		.set = bond_option_num_peer_notif_set
430 	},
431 	[BOND_OPT_PEER_NOTIF_DELAY] = {
432 		.id = BOND_OPT_PEER_NOTIF_DELAY,
433 		.name = "peer_notif_delay",
434 		.desc = "Delay between each peer notification on failover event, in milliseconds",
435 		.values = bond_intmax_tbl,
436 		.set = bond_option_peer_notif_delay_set
437 	}
438 };
439 
440 /* Searches for an option by name */
441 const struct bond_option *bond_opt_get_by_name(const char *name)
442 {
443 	const struct bond_option *opt;
444 	int option;
445 
446 	for (option = 0; option < BOND_OPT_LAST; option++) {
447 		opt = bond_opt_get(option);
448 		if (opt && !strcmp(opt->name, name))
449 			return opt;
450 	}
451 
452 	return NULL;
453 }
454 
455 /* Searches for a value in opt's values[] table */
456 const struct bond_opt_value *bond_opt_get_val(unsigned int option, u64 val)
457 {
458 	const struct bond_option *opt;
459 	int i;
460 
461 	opt = bond_opt_get(option);
462 	if (WARN_ON(!opt))
463 		return NULL;
464 	for (i = 0; opt->values && opt->values[i].string; i++)
465 		if (opt->values[i].value == val)
466 			return &opt->values[i];
467 
468 	return NULL;
469 }
470 
471 /* Searches for a value in opt's values[] table which matches the flagmask */
472 static const struct bond_opt_value *bond_opt_get_flags(const struct bond_option *opt,
473 						       u32 flagmask)
474 {
475 	int i;
476 
477 	for (i = 0; opt->values && opt->values[i].string; i++)
478 		if (opt->values[i].flags & flagmask)
479 			return &opt->values[i];
480 
481 	return NULL;
482 }
483 
484 /* If maxval is missing then there's no range to check. In case minval is
485  * missing then it's considered to be 0.
486  */
487 static bool bond_opt_check_range(const struct bond_option *opt, u64 val)
488 {
489 	const struct bond_opt_value *minval, *maxval;
490 
491 	minval = bond_opt_get_flags(opt, BOND_VALFLAG_MIN);
492 	maxval = bond_opt_get_flags(opt, BOND_VALFLAG_MAX);
493 	if (!maxval || (minval && val < minval->value) || val > maxval->value)
494 		return false;
495 
496 	return true;
497 }
498 
499 /**
500  * bond_opt_parse - parse option value
501  * @opt: the option to parse against
502  * @val: value to parse
503  *
504  * This function tries to extract the value from @val and check if it's
505  * a possible match for the option and returns NULL if a match isn't found,
506  * or the struct_opt_value that matched. It also strips the new line from
507  * @val->string if it's present.
508  */
509 const struct bond_opt_value *bond_opt_parse(const struct bond_option *opt,
510 					    struct bond_opt_value *val)
511 {
512 	char *p, valstr[BOND_OPT_MAX_NAMELEN + 1] = { 0, };
513 	const struct bond_opt_value *tbl;
514 	const struct bond_opt_value *ret = NULL;
515 	bool checkval;
516 	int i, rv;
517 
518 	/* No parsing if the option wants a raw val */
519 	if (opt->flags & BOND_OPTFLAG_RAWVAL)
520 		return val;
521 
522 	tbl = opt->values;
523 	if (!tbl)
524 		goto out;
525 
526 	/* ULLONG_MAX is used to bypass string processing */
527 	checkval = val->value != ULLONG_MAX;
528 	if (!checkval) {
529 		if (!val->string)
530 			goto out;
531 		p = strchr(val->string, '\n');
532 		if (p)
533 			*p = '\0';
534 		for (p = val->string; *p; p++)
535 			if (!(isdigit(*p) || isspace(*p)))
536 				break;
537 		/* The following code extracts the string to match or the value
538 		 * and sets checkval appropriately
539 		 */
540 		if (*p) {
541 			rv = sscanf(val->string, "%32s", valstr);
542 		} else {
543 			rv = sscanf(val->string, "%llu", &val->value);
544 			checkval = true;
545 		}
546 		if (!rv)
547 			goto out;
548 	}
549 
550 	for (i = 0; tbl[i].string; i++) {
551 		/* Check for exact match */
552 		if (checkval) {
553 			if (val->value == tbl[i].value)
554 				ret = &tbl[i];
555 		} else {
556 			if (!strcmp(valstr, "default") &&
557 			    (tbl[i].flags & BOND_VALFLAG_DEFAULT))
558 				ret = &tbl[i];
559 
560 			if (!strcmp(valstr, tbl[i].string))
561 				ret = &tbl[i];
562 		}
563 		/* Found an exact match */
564 		if (ret)
565 			goto out;
566 	}
567 	/* Possible range match */
568 	if (checkval && bond_opt_check_range(opt, val->value))
569 		ret = val;
570 out:
571 	return ret;
572 }
573 
574 /* Check opt's dependencies against bond mode and currently set options */
575 static int bond_opt_check_deps(struct bonding *bond,
576 			       const struct bond_option *opt)
577 {
578 	struct bond_params *params = &bond->params;
579 
580 	if (test_bit(params->mode, &opt->unsuppmodes))
581 		return -EACCES;
582 	if ((opt->flags & BOND_OPTFLAG_NOSLAVES) && bond_has_slaves(bond))
583 		return -ENOTEMPTY;
584 	if ((opt->flags & BOND_OPTFLAG_IFDOWN) && (bond->dev->flags & IFF_UP))
585 		return -EBUSY;
586 
587 	return 0;
588 }
589 
590 static void bond_opt_dep_print(struct bonding *bond,
591 			       const struct bond_option *opt)
592 {
593 	const struct bond_opt_value *modeval;
594 	struct bond_params *params;
595 
596 	params = &bond->params;
597 	modeval = bond_opt_get_val(BOND_OPT_MODE, params->mode);
598 	if (test_bit(params->mode, &opt->unsuppmodes))
599 		netdev_err(bond->dev, "option %s: mode dependency failed, not supported in mode %s(%llu)\n",
600 			   opt->name, modeval->string, modeval->value);
601 }
602 
603 static void bond_opt_error_interpret(struct bonding *bond,
604 				     const struct bond_option *opt,
605 				     int error, const struct bond_opt_value *val)
606 {
607 	const struct bond_opt_value *minval, *maxval;
608 	char *p;
609 
610 	switch (error) {
611 	case -EINVAL:
612 		if (val) {
613 			if (val->string) {
614 				/* sometimes RAWVAL opts may have new lines */
615 				p = strchr(val->string, '\n');
616 				if (p)
617 					*p = '\0';
618 				netdev_err(bond->dev, "option %s: invalid value (%s)\n",
619 					   opt->name, val->string);
620 			} else {
621 				netdev_err(bond->dev, "option %s: invalid value (%llu)\n",
622 					   opt->name, val->value);
623 			}
624 		}
625 		minval = bond_opt_get_flags(opt, BOND_VALFLAG_MIN);
626 		maxval = bond_opt_get_flags(opt, BOND_VALFLAG_MAX);
627 		if (!maxval)
628 			break;
629 		netdev_err(bond->dev, "option %s: allowed values %llu - %llu\n",
630 			   opt->name, minval ? minval->value : 0, maxval->value);
631 		break;
632 	case -EACCES:
633 		bond_opt_dep_print(bond, opt);
634 		break;
635 	case -ENOTEMPTY:
636 		netdev_err(bond->dev, "option %s: unable to set because the bond device has slaves\n",
637 			   opt->name);
638 		break;
639 	case -EBUSY:
640 		netdev_err(bond->dev, "option %s: unable to set because the bond device is up\n",
641 			   opt->name);
642 		break;
643 	case -ENODEV:
644 		if (val && val->string) {
645 			p = strchr(val->string, '\n');
646 			if (p)
647 				*p = '\0';
648 			netdev_err(bond->dev, "option %s: interface %s does not exist!\n",
649 				   opt->name, val->string);
650 		}
651 		break;
652 	default:
653 		break;
654 	}
655 }
656 
657 /**
658  * __bond_opt_set - set a bonding option
659  * @bond: target bond device
660  * @option: option to set
661  * @val: value to set it to
662  *
663  * This function is used to change the bond's option value, it can be
664  * used for both enabling/changing an option and for disabling it. RTNL lock
665  * must be obtained before calling this function.
666  */
667 int __bond_opt_set(struct bonding *bond,
668 		   unsigned int option, struct bond_opt_value *val)
669 {
670 	const struct bond_opt_value *retval = NULL;
671 	const struct bond_option *opt;
672 	int ret = -ENOENT;
673 
674 	ASSERT_RTNL();
675 
676 	opt = bond_opt_get(option);
677 	if (WARN_ON(!val) || WARN_ON(!opt))
678 		goto out;
679 	ret = bond_opt_check_deps(bond, opt);
680 	if (ret)
681 		goto out;
682 	retval = bond_opt_parse(opt, val);
683 	if (!retval) {
684 		ret = -EINVAL;
685 		goto out;
686 	}
687 	ret = opt->set(bond, retval);
688 out:
689 	if (ret)
690 		bond_opt_error_interpret(bond, opt, ret, val);
691 
692 	return ret;
693 }
694 /**
695  * __bond_opt_set_notify - set a bonding option
696  * @bond: target bond device
697  * @option: option to set
698  * @val: value to set it to
699  *
700  * This function is used to change the bond's option value and trigger
701  * a notification to user sapce. It can be used for both enabling/changing
702  * an option and for disabling it. RTNL lock must be obtained before calling
703  * this function.
704  */
705 int __bond_opt_set_notify(struct bonding *bond,
706 			  unsigned int option, struct bond_opt_value *val)
707 {
708 	int ret;
709 
710 	ASSERT_RTNL();
711 
712 	ret = __bond_opt_set(bond, option, val);
713 
714 	if (!ret && (bond->dev->reg_state == NETREG_REGISTERED))
715 		call_netdevice_notifiers(NETDEV_CHANGEINFODATA, bond->dev);
716 
717 	return ret;
718 }
719 
720 /**
721  * bond_opt_tryset_rtnl - try to acquire rtnl and call __bond_opt_set
722  * @bond: target bond device
723  * @option: option to set
724  * @buf: value to set it to
725  *
726  * This function tries to acquire RTNL without blocking and if successful
727  * calls __bond_opt_set. It is mainly used for sysfs option manipulation.
728  */
729 int bond_opt_tryset_rtnl(struct bonding *bond, unsigned int option, char *buf)
730 {
731 	struct bond_opt_value optval;
732 	int ret;
733 
734 	if (!rtnl_trylock())
735 		return restart_syscall();
736 	bond_opt_initstr(&optval, buf);
737 	ret = __bond_opt_set_notify(bond, option, &optval);
738 	rtnl_unlock();
739 
740 	return ret;
741 }
742 
743 /**
744  * bond_opt_get - get a pointer to an option
745  * @option: option for which to return a pointer
746  *
747  * This function checks if option is valid and if so returns a pointer
748  * to its entry in the bond_opts[] option array.
749  */
750 const struct bond_option *bond_opt_get(unsigned int option)
751 {
752 	if (!BOND_OPT_VALID(option))
753 		return NULL;
754 
755 	return &bond_opts[option];
756 }
757 
758 static bool bond_set_xfrm_features(struct bonding *bond)
759 {
760 	if (!IS_ENABLED(CONFIG_XFRM_OFFLOAD))
761 		return false;
762 
763 	if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
764 		bond->dev->wanted_features |= BOND_XFRM_FEATURES;
765 	else
766 		bond->dev->wanted_features &= ~BOND_XFRM_FEATURES;
767 
768 	return true;
769 }
770 
771 static bool bond_set_tls_features(struct bonding *bond)
772 {
773 	if (!IS_ENABLED(CONFIG_TLS_DEVICE))
774 		return false;
775 
776 	if (bond_sk_check(bond))
777 		bond->dev->wanted_features |= BOND_TLS_FEATURES;
778 	else
779 		bond->dev->wanted_features &= ~BOND_TLS_FEATURES;
780 
781 	return true;
782 }
783 
784 static int bond_option_mode_set(struct bonding *bond,
785 				const struct bond_opt_value *newval)
786 {
787 	if (!bond_mode_uses_arp(newval->value)) {
788 		if (bond->params.arp_interval) {
789 			netdev_dbg(bond->dev, "%s mode is incompatible with arp monitoring, start mii monitoring\n",
790 				   newval->string);
791 			/* disable arp monitoring */
792 			bond->params.arp_interval = 0;
793 		}
794 
795 		if (!bond->params.miimon) {
796 			/* set miimon to default value */
797 			bond->params.miimon = BOND_DEFAULT_MIIMON;
798 			netdev_dbg(bond->dev, "Setting MII monitoring interval to %d\n",
799 				   bond->params.miimon);
800 		}
801 	}
802 
803 	if (newval->value == BOND_MODE_ALB)
804 		bond->params.tlb_dynamic_lb = 1;
805 
806 	/* don't cache arp_validate between modes */
807 	bond->params.arp_validate = BOND_ARP_VALIDATE_NONE;
808 	bond->params.mode = newval->value;
809 
810 	if (bond->dev->reg_state == NETREG_REGISTERED) {
811 		bool update = false;
812 
813 		update |= bond_set_xfrm_features(bond);
814 		update |= bond_set_tls_features(bond);
815 
816 		if (update)
817 			netdev_update_features(bond->dev);
818 	}
819 
820 	return 0;
821 }
822 
823 static int bond_option_active_slave_set(struct bonding *bond,
824 					const struct bond_opt_value *newval)
825 {
826 	char ifname[IFNAMSIZ] = { 0, };
827 	struct net_device *slave_dev;
828 	int ret = 0;
829 
830 	sscanf(newval->string, "%15s", ifname); /* IFNAMSIZ */
831 	if (!strlen(ifname) || newval->string[0] == '\n') {
832 		slave_dev = NULL;
833 	} else {
834 		slave_dev = __dev_get_by_name(dev_net(bond->dev), ifname);
835 		if (!slave_dev)
836 			return -ENODEV;
837 	}
838 
839 	if (slave_dev) {
840 		if (!netif_is_bond_slave(slave_dev)) {
841 			slave_err(bond->dev, slave_dev, "Device is not bonding slave\n");
842 			return -EINVAL;
843 		}
844 
845 		if (bond->dev != netdev_master_upper_dev_get(slave_dev)) {
846 			slave_err(bond->dev, slave_dev, "Device is not our slave\n");
847 			return -EINVAL;
848 		}
849 	}
850 
851 	block_netpoll_tx();
852 	/* check to see if we are clearing active */
853 	if (!slave_dev) {
854 		netdev_dbg(bond->dev, "Clearing current active slave\n");
855 		RCU_INIT_POINTER(bond->curr_active_slave, NULL);
856 		bond_select_active_slave(bond);
857 	} else {
858 		struct slave *old_active = rtnl_dereference(bond->curr_active_slave);
859 		struct slave *new_active = bond_slave_get_rtnl(slave_dev);
860 
861 		BUG_ON(!new_active);
862 
863 		if (new_active == old_active) {
864 			/* do nothing */
865 			slave_dbg(bond->dev, new_active->dev, "is already the current active slave\n");
866 		} else {
867 			if (old_active && (new_active->link == BOND_LINK_UP) &&
868 			    bond_slave_is_up(new_active)) {
869 				slave_dbg(bond->dev, new_active->dev, "Setting as active slave\n");
870 				bond_change_active_slave(bond, new_active);
871 			} else {
872 				slave_err(bond->dev, new_active->dev, "Could not set as active slave; either %s is down or the link is down\n",
873 					  new_active->dev->name);
874 				ret = -EINVAL;
875 			}
876 		}
877 	}
878 	unblock_netpoll_tx();
879 
880 	return ret;
881 }
882 
883 /* There are two tricky bits here.  First, if MII monitoring is activated, then
884  * we must disable ARP monitoring.  Second, if the timer isn't running, we must
885  * start it.
886  */
887 static int bond_option_miimon_set(struct bonding *bond,
888 				  const struct bond_opt_value *newval)
889 {
890 	netdev_dbg(bond->dev, "Setting MII monitoring interval to %llu\n",
891 		   newval->value);
892 	bond->params.miimon = newval->value;
893 	if (bond->params.updelay)
894 		netdev_dbg(bond->dev, "Note: Updating updelay (to %d) since it is a multiple of the miimon value\n",
895 			   bond->params.updelay * bond->params.miimon);
896 	if (bond->params.downdelay)
897 		netdev_dbg(bond->dev, "Note: Updating downdelay (to %d) since it is a multiple of the miimon value\n",
898 			   bond->params.downdelay * bond->params.miimon);
899 	if (bond->params.peer_notif_delay)
900 		netdev_dbg(bond->dev, "Note: Updating peer_notif_delay (to %d) since it is a multiple of the miimon value\n",
901 			   bond->params.peer_notif_delay * bond->params.miimon);
902 	if (newval->value && bond->params.arp_interval) {
903 		netdev_dbg(bond->dev, "MII monitoring cannot be used with ARP monitoring - disabling ARP monitoring...\n");
904 		bond->params.arp_interval = 0;
905 		if (bond->params.arp_validate)
906 			bond->params.arp_validate = BOND_ARP_VALIDATE_NONE;
907 	}
908 	if (bond->dev->flags & IFF_UP) {
909 		/* If the interface is up, we may need to fire off
910 		 * the MII timer. If the interface is down, the
911 		 * timer will get fired off when the open function
912 		 * is called.
913 		 */
914 		if (!newval->value) {
915 			cancel_delayed_work_sync(&bond->mii_work);
916 		} else {
917 			cancel_delayed_work_sync(&bond->arp_work);
918 			queue_delayed_work(bond->wq, &bond->mii_work, 0);
919 		}
920 	}
921 
922 	return 0;
923 }
924 
925 /* Set up, down and peer notification delays. These must be multiples
926  * of the MII monitoring value, and are stored internally as the
927  * multiplier. Thus, we must translate to MS for the real world.
928  */
929 static int _bond_option_delay_set(struct bonding *bond,
930 				  const struct bond_opt_value *newval,
931 				  const char *name,
932 				  int *target)
933 {
934 	int value = newval->value;
935 
936 	if (!bond->params.miimon) {
937 		netdev_err(bond->dev, "Unable to set %s as MII monitoring is disabled\n",
938 			   name);
939 		return -EPERM;
940 	}
941 	if ((value % bond->params.miimon) != 0) {
942 		netdev_warn(bond->dev,
943 			    "%s (%d) is not a multiple of miimon (%d), value rounded to %d ms\n",
944 			    name,
945 			    value, bond->params.miimon,
946 			    (value / bond->params.miimon) *
947 			    bond->params.miimon);
948 	}
949 	*target = value / bond->params.miimon;
950 	netdev_dbg(bond->dev, "Setting %s to %d\n",
951 		   name,
952 		   *target * bond->params.miimon);
953 
954 	return 0;
955 }
956 
957 static int bond_option_updelay_set(struct bonding *bond,
958 				   const struct bond_opt_value *newval)
959 {
960 	return _bond_option_delay_set(bond, newval, "up delay",
961 				      &bond->params.updelay);
962 }
963 
964 static int bond_option_downdelay_set(struct bonding *bond,
965 				     const struct bond_opt_value *newval)
966 {
967 	return _bond_option_delay_set(bond, newval, "down delay",
968 				      &bond->params.downdelay);
969 }
970 
971 static int bond_option_peer_notif_delay_set(struct bonding *bond,
972 					    const struct bond_opt_value *newval)
973 {
974 	int ret = _bond_option_delay_set(bond, newval,
975 					 "peer notification delay",
976 					 &bond->params.peer_notif_delay);
977 	return ret;
978 }
979 
980 static int bond_option_use_carrier_set(struct bonding *bond,
981 				       const struct bond_opt_value *newval)
982 {
983 	netdev_dbg(bond->dev, "Setting use_carrier to %llu\n",
984 		   newval->value);
985 	bond->params.use_carrier = newval->value;
986 
987 	return 0;
988 }
989 
990 /* There are two tricky bits here.  First, if ARP monitoring is activated, then
991  * we must disable MII monitoring.  Second, if the ARP timer isn't running,
992  * we must start it.
993  */
994 static int bond_option_arp_interval_set(struct bonding *bond,
995 					const struct bond_opt_value *newval)
996 {
997 	netdev_dbg(bond->dev, "Setting ARP monitoring interval to %llu\n",
998 		   newval->value);
999 	bond->params.arp_interval = newval->value;
1000 	if (newval->value) {
1001 		if (bond->params.miimon) {
1002 			netdev_dbg(bond->dev, "ARP monitoring cannot be used with MII monitoring. Disabling MII monitoring\n");
1003 			bond->params.miimon = 0;
1004 		}
1005 		if (!bond->params.arp_targets[0])
1006 			netdev_dbg(bond->dev, "ARP monitoring has been set up, but no ARP targets have been specified\n");
1007 	}
1008 	if (bond->dev->flags & IFF_UP) {
1009 		/* If the interface is up, we may need to fire off
1010 		 * the ARP timer.  If the interface is down, the
1011 		 * timer will get fired off when the open function
1012 		 * is called.
1013 		 */
1014 		if (!newval->value) {
1015 			if (bond->params.arp_validate)
1016 				bond->recv_probe = NULL;
1017 			cancel_delayed_work_sync(&bond->arp_work);
1018 		} else {
1019 			/* arp_validate can be set only in active-backup mode */
1020 			bond->recv_probe = bond_arp_rcv;
1021 			cancel_delayed_work_sync(&bond->mii_work);
1022 			queue_delayed_work(bond->wq, &bond->arp_work, 0);
1023 		}
1024 	}
1025 
1026 	return 0;
1027 }
1028 
1029 static void _bond_options_arp_ip_target_set(struct bonding *bond, int slot,
1030 					    __be32 target,
1031 					    unsigned long last_rx)
1032 {
1033 	__be32 *targets = bond->params.arp_targets;
1034 	struct list_head *iter;
1035 	struct slave *slave;
1036 
1037 	if (slot >= 0 && slot < BOND_MAX_ARP_TARGETS) {
1038 		bond_for_each_slave(bond, slave, iter)
1039 			slave->target_last_arp_rx[slot] = last_rx;
1040 		targets[slot] = target;
1041 	}
1042 }
1043 
1044 static int _bond_option_arp_ip_target_add(struct bonding *bond, __be32 target)
1045 {
1046 	__be32 *targets = bond->params.arp_targets;
1047 	int ind;
1048 
1049 	if (!bond_is_ip_target_ok(target)) {
1050 		netdev_err(bond->dev, "invalid ARP target %pI4 specified for addition\n",
1051 			   &target);
1052 		return -EINVAL;
1053 	}
1054 
1055 	if (bond_get_targets_ip(targets, target) != -1) { /* dup */
1056 		netdev_err(bond->dev, "ARP target %pI4 is already present\n",
1057 			   &target);
1058 		return -EINVAL;
1059 	}
1060 
1061 	ind = bond_get_targets_ip(targets, 0); /* first free slot */
1062 	if (ind == -1) {
1063 		netdev_err(bond->dev, "ARP target table is full!\n");
1064 		return -EINVAL;
1065 	}
1066 
1067 	netdev_dbg(bond->dev, "Adding ARP target %pI4\n", &target);
1068 
1069 	_bond_options_arp_ip_target_set(bond, ind, target, jiffies);
1070 
1071 	return 0;
1072 }
1073 
1074 static int bond_option_arp_ip_target_add(struct bonding *bond, __be32 target)
1075 {
1076 	return _bond_option_arp_ip_target_add(bond, target);
1077 }
1078 
1079 static int bond_option_arp_ip_target_rem(struct bonding *bond, __be32 target)
1080 {
1081 	__be32 *targets = bond->params.arp_targets;
1082 	struct list_head *iter;
1083 	struct slave *slave;
1084 	unsigned long *targets_rx;
1085 	int ind, i;
1086 
1087 	if (!bond_is_ip_target_ok(target)) {
1088 		netdev_err(bond->dev, "invalid ARP target %pI4 specified for removal\n",
1089 			   &target);
1090 		return -EINVAL;
1091 	}
1092 
1093 	ind = bond_get_targets_ip(targets, target);
1094 	if (ind == -1) {
1095 		netdev_err(bond->dev, "unable to remove nonexistent ARP target %pI4\n",
1096 			   &target);
1097 		return -EINVAL;
1098 	}
1099 
1100 	if (ind == 0 && !targets[1] && bond->params.arp_interval)
1101 		netdev_warn(bond->dev, "Removing last arp target with arp_interval on\n");
1102 
1103 	netdev_dbg(bond->dev, "Removing ARP target %pI4\n", &target);
1104 
1105 	bond_for_each_slave(bond, slave, iter) {
1106 		targets_rx = slave->target_last_arp_rx;
1107 		for (i = ind; (i < BOND_MAX_ARP_TARGETS-1) && targets[i+1]; i++)
1108 			targets_rx[i] = targets_rx[i+1];
1109 		targets_rx[i] = 0;
1110 	}
1111 	for (i = ind; (i < BOND_MAX_ARP_TARGETS-1) && targets[i+1]; i++)
1112 		targets[i] = targets[i+1];
1113 	targets[i] = 0;
1114 
1115 	return 0;
1116 }
1117 
1118 void bond_option_arp_ip_targets_clear(struct bonding *bond)
1119 {
1120 	int i;
1121 
1122 	for (i = 0; i < BOND_MAX_ARP_TARGETS; i++)
1123 		_bond_options_arp_ip_target_set(bond, i, 0, 0);
1124 }
1125 
1126 static int bond_option_arp_ip_targets_set(struct bonding *bond,
1127 					  const struct bond_opt_value *newval)
1128 {
1129 	int ret = -EPERM;
1130 	__be32 target;
1131 
1132 	if (newval->string) {
1133 		if (!in4_pton(newval->string+1, -1, (u8 *)&target, -1, NULL)) {
1134 			netdev_err(bond->dev, "invalid ARP target %pI4 specified\n",
1135 				   &target);
1136 			return ret;
1137 		}
1138 		if (newval->string[0] == '+')
1139 			ret = bond_option_arp_ip_target_add(bond, target);
1140 		else if (newval->string[0] == '-')
1141 			ret = bond_option_arp_ip_target_rem(bond, target);
1142 		else
1143 			netdev_err(bond->dev, "no command found in arp_ip_targets file - use +<addr> or -<addr>\n");
1144 	} else {
1145 		target = newval->value;
1146 		ret = bond_option_arp_ip_target_add(bond, target);
1147 	}
1148 
1149 	return ret;
1150 }
1151 
1152 static int bond_option_arp_validate_set(struct bonding *bond,
1153 					const struct bond_opt_value *newval)
1154 {
1155 	netdev_dbg(bond->dev, "Setting arp_validate to %s (%llu)\n",
1156 		   newval->string, newval->value);
1157 	bond->params.arp_validate = newval->value;
1158 
1159 	return 0;
1160 }
1161 
1162 static int bond_option_arp_all_targets_set(struct bonding *bond,
1163 					   const struct bond_opt_value *newval)
1164 {
1165 	netdev_dbg(bond->dev, "Setting arp_all_targets to %s (%llu)\n",
1166 		   newval->string, newval->value);
1167 	bond->params.arp_all_targets = newval->value;
1168 
1169 	return 0;
1170 }
1171 
1172 static int bond_option_primary_set(struct bonding *bond,
1173 				   const struct bond_opt_value *newval)
1174 {
1175 	char *p, *primary = newval->string;
1176 	struct list_head *iter;
1177 	struct slave *slave;
1178 
1179 	block_netpoll_tx();
1180 
1181 	p = strchr(primary, '\n');
1182 	if (p)
1183 		*p = '\0';
1184 	/* check to see if we are clearing primary */
1185 	if (!strlen(primary)) {
1186 		netdev_dbg(bond->dev, "Setting primary slave to None\n");
1187 		RCU_INIT_POINTER(bond->primary_slave, NULL);
1188 		memset(bond->params.primary, 0, sizeof(bond->params.primary));
1189 		bond_select_active_slave(bond);
1190 		goto out;
1191 	}
1192 
1193 	bond_for_each_slave(bond, slave, iter) {
1194 		if (strncmp(slave->dev->name, primary, IFNAMSIZ) == 0) {
1195 			slave_dbg(bond->dev, slave->dev, "Setting as primary slave\n");
1196 			rcu_assign_pointer(bond->primary_slave, slave);
1197 			strcpy(bond->params.primary, slave->dev->name);
1198 			bond->force_primary = true;
1199 			bond_select_active_slave(bond);
1200 			goto out;
1201 		}
1202 	}
1203 
1204 	if (rtnl_dereference(bond->primary_slave)) {
1205 		netdev_dbg(bond->dev, "Setting primary slave to None\n");
1206 		RCU_INIT_POINTER(bond->primary_slave, NULL);
1207 		bond_select_active_slave(bond);
1208 	}
1209 	strscpy_pad(bond->params.primary, primary, IFNAMSIZ);
1210 
1211 	netdev_dbg(bond->dev, "Recording %s as primary, but it has not been enslaved yet\n",
1212 		   primary);
1213 
1214 out:
1215 	unblock_netpoll_tx();
1216 
1217 	return 0;
1218 }
1219 
1220 static int bond_option_primary_reselect_set(struct bonding *bond,
1221 					    const struct bond_opt_value *newval)
1222 {
1223 	netdev_dbg(bond->dev, "Setting primary_reselect to %s (%llu)\n",
1224 		   newval->string, newval->value);
1225 	bond->params.primary_reselect = newval->value;
1226 
1227 	block_netpoll_tx();
1228 	bond_select_active_slave(bond);
1229 	unblock_netpoll_tx();
1230 
1231 	return 0;
1232 }
1233 
1234 static int bond_option_fail_over_mac_set(struct bonding *bond,
1235 					 const struct bond_opt_value *newval)
1236 {
1237 	netdev_dbg(bond->dev, "Setting fail_over_mac to %s (%llu)\n",
1238 		   newval->string, newval->value);
1239 	bond->params.fail_over_mac = newval->value;
1240 
1241 	return 0;
1242 }
1243 
1244 static int bond_option_xmit_hash_policy_set(struct bonding *bond,
1245 					    const struct bond_opt_value *newval)
1246 {
1247 	netdev_dbg(bond->dev, "Setting xmit hash policy to %s (%llu)\n",
1248 		   newval->string, newval->value);
1249 	bond->params.xmit_policy = newval->value;
1250 
1251 	if (bond->dev->reg_state == NETREG_REGISTERED)
1252 		if (bond_set_tls_features(bond))
1253 			netdev_update_features(bond->dev);
1254 
1255 	return 0;
1256 }
1257 
1258 static int bond_option_resend_igmp_set(struct bonding *bond,
1259 				       const struct bond_opt_value *newval)
1260 {
1261 	netdev_dbg(bond->dev, "Setting resend_igmp to %llu\n",
1262 		   newval->value);
1263 	bond->params.resend_igmp = newval->value;
1264 
1265 	return 0;
1266 }
1267 
1268 static int bond_option_num_peer_notif_set(struct bonding *bond,
1269 				   const struct bond_opt_value *newval)
1270 {
1271 	bond->params.num_peer_notif = newval->value;
1272 
1273 	return 0;
1274 }
1275 
1276 static int bond_option_all_slaves_active_set(struct bonding *bond,
1277 					     const struct bond_opt_value *newval)
1278 {
1279 	struct list_head *iter;
1280 	struct slave *slave;
1281 
1282 	if (newval->value == bond->params.all_slaves_active)
1283 		return 0;
1284 	bond->params.all_slaves_active = newval->value;
1285 	bond_for_each_slave(bond, slave, iter) {
1286 		if (!bond_is_active_slave(slave)) {
1287 			if (newval->value)
1288 				slave->inactive = 0;
1289 			else
1290 				slave->inactive = 1;
1291 		}
1292 	}
1293 
1294 	return 0;
1295 }
1296 
1297 static int bond_option_min_links_set(struct bonding *bond,
1298 				     const struct bond_opt_value *newval)
1299 {
1300 	netdev_dbg(bond->dev, "Setting min links value to %llu\n",
1301 		   newval->value);
1302 	bond->params.min_links = newval->value;
1303 	bond_set_carrier(bond);
1304 
1305 	return 0;
1306 }
1307 
1308 static int bond_option_lp_interval_set(struct bonding *bond,
1309 				       const struct bond_opt_value *newval)
1310 {
1311 	bond->params.lp_interval = newval->value;
1312 
1313 	return 0;
1314 }
1315 
1316 static int bond_option_pps_set(struct bonding *bond,
1317 			       const struct bond_opt_value *newval)
1318 {
1319 	netdev_dbg(bond->dev, "Setting packets per slave to %llu\n",
1320 		   newval->value);
1321 	bond->params.packets_per_slave = newval->value;
1322 	if (newval->value > 0) {
1323 		bond->params.reciprocal_packets_per_slave =
1324 			reciprocal_value(newval->value);
1325 	} else {
1326 		/* reciprocal_packets_per_slave is unused if
1327 		 * packets_per_slave is 0 or 1, just initialize it
1328 		 */
1329 		bond->params.reciprocal_packets_per_slave =
1330 			(struct reciprocal_value) { 0 };
1331 	}
1332 
1333 	return 0;
1334 }
1335 
1336 static int bond_option_lacp_rate_set(struct bonding *bond,
1337 				     const struct bond_opt_value *newval)
1338 {
1339 	netdev_dbg(bond->dev, "Setting LACP rate to %s (%llu)\n",
1340 		   newval->string, newval->value);
1341 	bond->params.lacp_fast = newval->value;
1342 	bond_3ad_update_lacp_rate(bond);
1343 
1344 	return 0;
1345 }
1346 
1347 static int bond_option_ad_select_set(struct bonding *bond,
1348 				     const struct bond_opt_value *newval)
1349 {
1350 	netdev_dbg(bond->dev, "Setting ad_select to %s (%llu)\n",
1351 		   newval->string, newval->value);
1352 	bond->params.ad_select = newval->value;
1353 
1354 	return 0;
1355 }
1356 
1357 static int bond_option_queue_id_set(struct bonding *bond,
1358 				    const struct bond_opt_value *newval)
1359 {
1360 	struct slave *slave, *update_slave;
1361 	struct net_device *sdev;
1362 	struct list_head *iter;
1363 	char *delim;
1364 	int ret = 0;
1365 	u16 qid;
1366 
1367 	/* delim will point to queue id if successful */
1368 	delim = strchr(newval->string, ':');
1369 	if (!delim)
1370 		goto err_no_cmd;
1371 
1372 	/* Terminate string that points to device name and bump it
1373 	 * up one, so we can read the queue id there.
1374 	 */
1375 	*delim = '\0';
1376 	if (sscanf(++delim, "%hd\n", &qid) != 1)
1377 		goto err_no_cmd;
1378 
1379 	/* Check buffer length, valid ifname and queue id */
1380 	if (!dev_valid_name(newval->string) ||
1381 	    qid > bond->dev->real_num_tx_queues)
1382 		goto err_no_cmd;
1383 
1384 	/* Get the pointer to that interface if it exists */
1385 	sdev = __dev_get_by_name(dev_net(bond->dev), newval->string);
1386 	if (!sdev)
1387 		goto err_no_cmd;
1388 
1389 	/* Search for thes slave and check for duplicate qids */
1390 	update_slave = NULL;
1391 	bond_for_each_slave(bond, slave, iter) {
1392 		if (sdev == slave->dev)
1393 			/* We don't need to check the matching
1394 			 * slave for dups, since we're overwriting it
1395 			 */
1396 			update_slave = slave;
1397 		else if (qid && qid == slave->queue_id) {
1398 			goto err_no_cmd;
1399 		}
1400 	}
1401 
1402 	if (!update_slave)
1403 		goto err_no_cmd;
1404 
1405 	/* Actually set the qids for the slave */
1406 	update_slave->queue_id = qid;
1407 
1408 out:
1409 	return ret;
1410 
1411 err_no_cmd:
1412 	netdev_dbg(bond->dev, "invalid input for queue_id set\n");
1413 	ret = -EPERM;
1414 	goto out;
1415 
1416 }
1417 
1418 static int bond_option_slaves_set(struct bonding *bond,
1419 				  const struct bond_opt_value *newval)
1420 {
1421 	char command[IFNAMSIZ + 1] = { 0, };
1422 	struct net_device *dev;
1423 	char *ifname;
1424 	int ret;
1425 
1426 	sscanf(newval->string, "%16s", command); /* IFNAMSIZ*/
1427 	ifname = command + 1;
1428 	if ((strlen(command) <= 1) ||
1429 	    (command[0] != '+' && command[0] != '-') ||
1430 	    !dev_valid_name(ifname))
1431 		goto err_no_cmd;
1432 
1433 	dev = __dev_get_by_name(dev_net(bond->dev), ifname);
1434 	if (!dev) {
1435 		netdev_dbg(bond->dev, "interface %s does not exist!\n",
1436 			   ifname);
1437 		ret = -ENODEV;
1438 		goto out;
1439 	}
1440 
1441 	switch (command[0]) {
1442 	case '+':
1443 		slave_dbg(bond->dev, dev, "Enslaving interface\n");
1444 		ret = bond_enslave(bond->dev, dev, NULL);
1445 		break;
1446 
1447 	case '-':
1448 		slave_dbg(bond->dev, dev, "Releasing interface\n");
1449 		ret = bond_release(bond->dev, dev);
1450 		break;
1451 
1452 	default:
1453 		/* should not run here. */
1454 		goto err_no_cmd;
1455 	}
1456 
1457 out:
1458 	return ret;
1459 
1460 err_no_cmd:
1461 	netdev_err(bond->dev, "no command found in slaves file - use +ifname or -ifname\n");
1462 	ret = -EPERM;
1463 	goto out;
1464 }
1465 
1466 static int bond_option_tlb_dynamic_lb_set(struct bonding *bond,
1467 					  const struct bond_opt_value *newval)
1468 {
1469 	netdev_dbg(bond->dev, "Setting dynamic-lb to %s (%llu)\n",
1470 		   newval->string, newval->value);
1471 	bond->params.tlb_dynamic_lb = newval->value;
1472 
1473 	return 0;
1474 }
1475 
1476 static int bond_option_ad_actor_sys_prio_set(struct bonding *bond,
1477 					     const struct bond_opt_value *newval)
1478 {
1479 	netdev_dbg(bond->dev, "Setting ad_actor_sys_prio to %llu\n",
1480 		   newval->value);
1481 
1482 	bond->params.ad_actor_sys_prio = newval->value;
1483 	bond_3ad_update_ad_actor_settings(bond);
1484 
1485 	return 0;
1486 }
1487 
1488 static int bond_option_ad_actor_system_set(struct bonding *bond,
1489 					   const struct bond_opt_value *newval)
1490 {
1491 	u8 macaddr[ETH_ALEN];
1492 	u8 *mac;
1493 
1494 	if (newval->string) {
1495 		if (!mac_pton(newval->string, macaddr))
1496 			goto err;
1497 		mac = macaddr;
1498 	} else {
1499 		mac = (u8 *)&newval->value;
1500 	}
1501 
1502 	if (!is_valid_ether_addr(mac))
1503 		goto err;
1504 
1505 	netdev_dbg(bond->dev, "Setting ad_actor_system to %pM\n", mac);
1506 	ether_addr_copy(bond->params.ad_actor_system, mac);
1507 	bond_3ad_update_ad_actor_settings(bond);
1508 
1509 	return 0;
1510 
1511 err:
1512 	netdev_err(bond->dev, "Invalid ad_actor_system MAC address.\n");
1513 	return -EINVAL;
1514 }
1515 
1516 static int bond_option_ad_user_port_key_set(struct bonding *bond,
1517 					    const struct bond_opt_value *newval)
1518 {
1519 	netdev_dbg(bond->dev, "Setting ad_user_port_key to %llu\n",
1520 		   newval->value);
1521 
1522 	bond->params.ad_user_port_key = newval->value;
1523 	return 0;
1524 }
1525