1// SPDX-License-Identifier: GPL-2.0
2/*
3 *  Shared Memory Communications over RDMA (SMC-R) and RoCE
4 *
5 *  Generic netlink support functions to interact with SMC module
6 *
7 *  Copyright IBM Corp. 2020
8 *
9 *  Author(s):	Guvenc Gulce <guvenc@linux.ibm.com>
10 */
11
12#include <linux/module.h>
13#include <linux/list.h>
14#include <linux/ctype.h>
15#include <linux/mutex.h>
16#include <linux/if.h>
17#include <linux/smc.h>
18
19#include "smc_core.h"
20#include "smc_ism.h"
21#include "smc_ib.h"
22#include "smc_clc.h"
23#include "smc_stats.h"
24#include "smc_netlink.h"
25
26const struct nla_policy
27smc_gen_ueid_policy[SMC_NLA_EID_TABLE_MAX + 1] = {
28	[SMC_NLA_EID_TABLE_UNSPEC]	= { .type = NLA_UNSPEC },
29	[SMC_NLA_EID_TABLE_ENTRY]	= { .type = NLA_STRING,
30					    .len = SMC_MAX_EID_LEN,
31					  },
32};
33
34#define SMC_CMD_MAX_ATTR 1
35/* SMC_GENL generic netlink operation definition */
36static const struct genl_ops smc_gen_nl_ops[] = {
37	{
38		.cmd = SMC_NETLINK_GET_SYS_INFO,
39		/* can be retrieved by unprivileged users */
40		.dumpit = smc_nl_get_sys_info,
41	},
42	{
43		.cmd = SMC_NETLINK_GET_LGR_SMCR,
44		/* can be retrieved by unprivileged users */
45		.dumpit = smcr_nl_get_lgr,
46	},
47	{
48		.cmd = SMC_NETLINK_GET_LINK_SMCR,
49		/* can be retrieved by unprivileged users */
50		.dumpit = smcr_nl_get_link,
51	},
52	{
53		.cmd = SMC_NETLINK_GET_LGR_SMCD,
54		/* can be retrieved by unprivileged users */
55		.dumpit = smcd_nl_get_lgr,
56	},
57	{
58		.cmd = SMC_NETLINK_GET_DEV_SMCD,
59		/* can be retrieved by unprivileged users */
60		.dumpit = smcd_nl_get_device,
61	},
62	{
63		.cmd = SMC_NETLINK_GET_DEV_SMCR,
64		/* can be retrieved by unprivileged users */
65		.dumpit = smcr_nl_get_device,
66	},
67	{
68		.cmd = SMC_NETLINK_GET_STATS,
69		/* can be retrieved by unprivileged users */
70		.dumpit = smc_nl_get_stats,
71	},
72	{
73		.cmd = SMC_NETLINK_GET_FBACK_STATS,
74		/* can be retrieved by unprivileged users */
75		.dumpit = smc_nl_get_fback_stats,
76	},
77	{
78		.cmd = SMC_NETLINK_DUMP_UEID,
79		/* can be retrieved by unprivileged users */
80		.dumpit = smc_nl_dump_ueid,
81	},
82	{
83		.cmd = SMC_NETLINK_ADD_UEID,
84		.flags = GENL_ADMIN_PERM,
85		.doit = smc_nl_add_ueid,
86		.policy = smc_gen_ueid_policy,
87	},
88	{
89		.cmd = SMC_NETLINK_REMOVE_UEID,
90		.flags = GENL_ADMIN_PERM,
91		.doit = smc_nl_remove_ueid,
92		.policy = smc_gen_ueid_policy,
93	},
94	{
95		.cmd = SMC_NETLINK_FLUSH_UEID,
96		.flags = GENL_ADMIN_PERM,
97		.doit = smc_nl_flush_ueid,
98	},
99	{
100		.cmd = SMC_NETLINK_DUMP_SEID,
101		/* can be retrieved by unprivileged users */
102		.dumpit = smc_nl_dump_seid,
103	},
104	{
105		.cmd = SMC_NETLINK_ENABLE_SEID,
106		.flags = GENL_ADMIN_PERM,
107		.doit = smc_nl_enable_seid,
108	},
109	{
110		.cmd = SMC_NETLINK_DISABLE_SEID,
111		.flags = GENL_ADMIN_PERM,
112		.doit = smc_nl_disable_seid,
113	},
114	{
115		.cmd = SMC_NETLINK_DUMP_HS_LIMITATION,
116		/* can be retrieved by unprivileged users */
117		.dumpit = smc_nl_dump_hs_limitation,
118	},
119	{
120		.cmd = SMC_NETLINK_ENABLE_HS_LIMITATION,
121		.flags = GENL_ADMIN_PERM,
122		.doit = smc_nl_enable_hs_limitation,
123	},
124	{
125		.cmd = SMC_NETLINK_DISABLE_HS_LIMITATION,
126		.flags = GENL_ADMIN_PERM,
127		.doit = smc_nl_disable_hs_limitation,
128	},
129};
130
131static const struct nla_policy smc_gen_nl_policy[2] = {
132	[SMC_CMD_MAX_ATTR]	= { .type = NLA_REJECT, },
133};
134
135/* SMC_GENL family definition */
136struct genl_family smc_gen_nl_family __ro_after_init = {
137	.hdrsize =	0,
138	.name =		SMC_GENL_FAMILY_NAME,
139	.version =	SMC_GENL_FAMILY_VERSION,
140	.maxattr =	SMC_CMD_MAX_ATTR,
141	.policy =	smc_gen_nl_policy,
142	.netnsok =	true,
143	.module =	THIS_MODULE,
144	.ops =		smc_gen_nl_ops,
145	.n_ops =	ARRAY_SIZE(smc_gen_nl_ops),
146	.resv_start_op = SMC_NETLINK_DISABLE_HS_LIMITATION + 1,
147};
148
149int __init smc_nl_init(void)
150{
151	return genl_register_family(&smc_gen_nl_family);
152}
153
154void smc_nl_exit(void)
155{
156	genl_unregister_family(&smc_gen_nl_family);
157}
158