net/smc/smc_netlink.c

   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
  26 const struct nla_policy
  27 smc_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 */
  36 static 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
 131 static const struct nla_policy smc_gen_nl_policy[2] = {
 132         [SMC_CMD_MAX_ATTR]      = { .type = NLA_REJECT, },
 133 };
 134
 135 /* SMC_GENL family definition */
 136 struct 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
 149 int __init smc_nl_init(void)
 150 {
 151         return genl_register_family(&smc_gen_nl_family);
 152 }
 153
 154 void smc_nl_exit(void)
 155 {
 156         genl_unregister_family(&smc_gen_nl_family);
 157 }