1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /*
3  * drivers/net/bond/bond_options.h - bonding options
4  * Copyright (c) 2013 Nikolay Aleksandrov <nikolay@redhat.com>
5  */
6 
7 #ifndef _NET_BOND_OPTIONS_H
8 #define _NET_BOND_OPTIONS_H
9 
10 #include <linux/bits.h>
11 #include <linux/limits.h>
12 #include <linux/types.h>
13 #include <linux/string.h>
14 
15 struct netlink_ext_ack;
16 struct nlattr;
17 
18 #define BOND_OPT_MAX_NAMELEN 32
19 #define BOND_OPT_VALID(opt) ((opt) < BOND_OPT_LAST)
20 #define BOND_MODE_ALL_EX(x) (~(x))
21 
22 /* Option flags:
23  * BOND_OPTFLAG_NOSLAVES - check if the bond device is empty before setting
24  * BOND_OPTFLAG_IFDOWN - check if the bond device is down before setting
25  * BOND_OPTFLAG_RAWVAL - the option parses the value itself
26  */
27 enum {
28 	BOND_OPTFLAG_NOSLAVES	= BIT(0),
29 	BOND_OPTFLAG_IFDOWN	= BIT(1),
30 	BOND_OPTFLAG_RAWVAL	= BIT(2)
31 };
32 
33 /* Value type flags:
34  * BOND_VALFLAG_DEFAULT - mark the value as default
35  * BOND_VALFLAG_(MIN|MAX) - mark the value as min/max
36  */
37 enum {
38 	BOND_VALFLAG_DEFAULT	= BIT(0),
39 	BOND_VALFLAG_MIN	= BIT(1),
40 	BOND_VALFLAG_MAX	= BIT(2)
41 };
42 
43 /* Option IDs, their bit positions correspond to their IDs */
44 enum {
45 	BOND_OPT_MODE,
46 	BOND_OPT_PACKETS_PER_SLAVE,
47 	BOND_OPT_XMIT_HASH,
48 	BOND_OPT_ARP_VALIDATE,
49 	BOND_OPT_ARP_ALL_TARGETS,
50 	BOND_OPT_FAIL_OVER_MAC,
51 	BOND_OPT_ARP_INTERVAL,
52 	BOND_OPT_ARP_TARGETS,
53 	BOND_OPT_DOWNDELAY,
54 	BOND_OPT_UPDELAY,
55 	BOND_OPT_LACP_RATE,
56 	BOND_OPT_MINLINKS,
57 	BOND_OPT_AD_SELECT,
58 	BOND_OPT_NUM_PEER_NOTIF,
59 	BOND_OPT_MIIMON,
60 	BOND_OPT_PRIMARY,
61 	BOND_OPT_PRIMARY_RESELECT,
62 	BOND_OPT_USE_CARRIER,
63 	BOND_OPT_ACTIVE_SLAVE,
64 	BOND_OPT_QUEUE_ID,
65 	BOND_OPT_ALL_SLAVES_ACTIVE,
66 	BOND_OPT_RESEND_IGMP,
67 	BOND_OPT_LP_INTERVAL,
68 	BOND_OPT_SLAVES,
69 	BOND_OPT_TLB_DYNAMIC_LB,
70 	BOND_OPT_AD_ACTOR_SYS_PRIO,
71 	BOND_OPT_AD_ACTOR_SYSTEM,
72 	BOND_OPT_AD_USER_PORT_KEY,
73 	BOND_OPT_NUM_PEER_NOTIF_ALIAS,
74 	BOND_OPT_PEER_NOTIF_DELAY,
75 	BOND_OPT_LACP_ACTIVE,
76 	BOND_OPT_MISSED_MAX,
77 	BOND_OPT_NS_TARGETS,
78 	BOND_OPT_PRIO,
79 	BOND_OPT_LAST
80 };
81 
82 /* This structure is used for storing option values and for passing option
83  * values when changing an option. The logic when used as an arg is as follows:
84  * - if value != ULLONG_MAX -> parse value
85  * - if string != NULL -> parse string
86  * - if the opt is RAW data and length less than maxlen,
87  *   copy the data to extra storage
88  */
89 
90 #define BOND_OPT_EXTRA_MAXLEN 16
91 struct bond_opt_value {
92 	char *string;
93 	u64 value;
94 	u32 flags;
95 	union {
96 		char extra[BOND_OPT_EXTRA_MAXLEN];
97 		struct net_device *slave_dev;
98 	};
99 };
100 
101 struct bonding;
102 
103 struct bond_option {
104 	int id;
105 	const char *name;
106 	const char *desc;
107 	u32 flags;
108 
109 	/* unsuppmodes is used to denote modes in which the option isn't
110 	 * supported.
111 	 */
112 	unsigned long unsuppmodes;
113 	/* supported values which this option can have, can be a subset of
114 	 * BOND_OPTVAL_RANGE's value range
115 	 */
116 	const struct bond_opt_value *values;
117 
118 	int (*set)(struct bonding *bond, const struct bond_opt_value *val);
119 };
120 
121 int __bond_opt_set(struct bonding *bond, unsigned int option,
122 		   struct bond_opt_value *val,
123 		   struct nlattr *bad_attr, struct netlink_ext_ack *extack);
124 int __bond_opt_set_notify(struct bonding *bond, unsigned int option,
125 			  struct bond_opt_value *val);
126 int bond_opt_tryset_rtnl(struct bonding *bond, unsigned int option, char *buf);
127 
128 const struct bond_opt_value *bond_opt_parse(const struct bond_option *opt,
129 					    struct bond_opt_value *val);
130 const struct bond_option *bond_opt_get(unsigned int option);
131 const struct bond_option *bond_opt_get_by_name(const char *name);
132 const struct bond_opt_value *bond_opt_get_val(unsigned int option, u64 val);
133 
134 /* This helper is used to initialize a bond_opt_value structure for parameter
135  * passing. There should be either a valid string or value, but not both.
136  * When value is ULLONG_MAX then string will be used.
137  */
__bond_opt_init(struct bond_opt_value * optval,char * string,u64 value,void * extra,size_t extra_len)138 static inline void __bond_opt_init(struct bond_opt_value *optval,
139 				   char *string, u64 value,
140 				   void *extra, size_t extra_len)
141 {
142 	memset(optval, 0, sizeof(*optval));
143 	optval->value = ULLONG_MAX;
144 	if (value != ULLONG_MAX)
145 		optval->value = value;
146 	else if (string)
147 		optval->string = string;
148 
149 	if (extra && extra_len <= BOND_OPT_EXTRA_MAXLEN)
150 		memcpy(optval->extra, extra, extra_len);
151 }
152 #define bond_opt_initval(optval, value) __bond_opt_init(optval, NULL, value, NULL, 0)
153 #define bond_opt_initstr(optval, str) __bond_opt_init(optval, str, ULLONG_MAX, NULL, 0)
154 #define bond_opt_initextra(optval, extra, extra_len) \
155 	__bond_opt_init(optval, NULL, ULLONG_MAX, extra, extra_len)
156 #define bond_opt_slave_initval(optval, slave_dev, value) \
157 	__bond_opt_init(optval, NULL, value, slave_dev, sizeof(struct net_device *))
158 
159 void bond_option_arp_ip_targets_clear(struct bonding *bond);
160 #if IS_ENABLED(CONFIG_IPV6)
161 void bond_option_ns_ip6_targets_clear(struct bonding *bond);
162 #endif
163 
164 #endif /* _NET_BOND_OPTIONS_H */
165