net/smc/smc_netlink.c

0001 // SPDX-License-Identifier: GPL-2.0
0002 /*
0003  *  Shared Memory Communications over RDMA (SMC-R) and RoCE
0004  *
0005  *  Generic netlink support functions to interact with SMC module
0006  *
0007  *  Copyright IBM Corp. 2020
0008  *
0009  *  Author(s):  Guvenc Gulce <guvenc@linux.ibm.com>
0010  */
0011
0012 #include <linux/module.h>
0013 #include <linux/list.h>
0014 #include <linux/ctype.h>
0015 #include <linux/mutex.h>
0016 #include <linux/if.h>
0017 #include <linux/smc.h>
0018
0019 #include "smc_core.h"
0020 #include "smc_ism.h"
0021 #include "smc_ib.h"
0022 #include "smc_clc.h"
0023 #include "smc_stats.h"
0024 #include "smc_netlink.h"
0025
0026 const struct nla_policy
0027 smc_gen_ueid_policy[SMC_NLA_EID_TABLE_MAX + 1] = {
0028     [SMC_NLA_EID_TABLE_UNSPEC]  = { .type = NLA_UNSPEC },
0029     [SMC_NLA_EID_TABLE_ENTRY]   = { .type = NLA_STRING,
0030                         .len = SMC_MAX_EID_LEN,
0031                       },
0032 };
0033
0034 #define SMC_CMD_MAX_ATTR 1
0035 /* SMC_GENL generic netlink operation definition */
0036 static const struct genl_ops smc_gen_nl_ops[] = {
0037     {
0038         .cmd = SMC_NETLINK_GET_SYS_INFO,
0039         /* can be retrieved by unprivileged users */
0040         .dumpit = smc_nl_get_sys_info,
0041     },
0042     {
0043         .cmd = SMC_NETLINK_GET_LGR_SMCR,
0044         /* can be retrieved by unprivileged users */
0045         .dumpit = smcr_nl_get_lgr,
0046     },
0047     {
0048         .cmd = SMC_NETLINK_GET_LINK_SMCR,
0049         /* can be retrieved by unprivileged users */
0050         .dumpit = smcr_nl_get_link,
0051     },
0052     {
0053         .cmd = SMC_NETLINK_GET_LGR_SMCD,
0054         /* can be retrieved by unprivileged users */
0055         .dumpit = smcd_nl_get_lgr,
0056     },
0057     {
0058         .cmd = SMC_NETLINK_GET_DEV_SMCD,
0059         /* can be retrieved by unprivileged users */
0060         .dumpit = smcd_nl_get_device,
0061     },
0062     {
0063         .cmd = SMC_NETLINK_GET_DEV_SMCR,
0064         /* can be retrieved by unprivileged users */
0065         .dumpit = smcr_nl_get_device,
0066     },
0067     {
0068         .cmd = SMC_NETLINK_GET_STATS,
0069         /* can be retrieved by unprivileged users */
0070         .dumpit = smc_nl_get_stats,
0071     },
0072     {
0073         .cmd = SMC_NETLINK_GET_FBACK_STATS,
0074         /* can be retrieved by unprivileged users */
0075         .dumpit = smc_nl_get_fback_stats,
0076     },
0077     {
0078         .cmd = SMC_NETLINK_DUMP_UEID,
0079         /* can be retrieved by unprivileged users */
0080         .dumpit = smc_nl_dump_ueid,
0081     },
0082     {
0083         .cmd = SMC_NETLINK_ADD_UEID,
0084         .flags = GENL_ADMIN_PERM,
0085         .doit = smc_nl_add_ueid,
0086         .policy = smc_gen_ueid_policy,
0087     },
0088     {
0089         .cmd = SMC_NETLINK_REMOVE_UEID,
0090         .flags = GENL_ADMIN_PERM,
0091         .doit = smc_nl_remove_ueid,
0092         .policy = smc_gen_ueid_policy,
0093     },
0094     {
0095         .cmd = SMC_NETLINK_FLUSH_UEID,
0096         .flags = GENL_ADMIN_PERM,
0097         .doit = smc_nl_flush_ueid,
0098     },
0099     {
0100         .cmd = SMC_NETLINK_DUMP_SEID,
0101         /* can be retrieved by unprivileged users */
0102         .dumpit = smc_nl_dump_seid,
0103     },
0104     {
0105         .cmd = SMC_NETLINK_ENABLE_SEID,
0106         .flags = GENL_ADMIN_PERM,
0107         .doit = smc_nl_enable_seid,
0108     },
0109     {
0110         .cmd = SMC_NETLINK_DISABLE_SEID,
0111         .flags = GENL_ADMIN_PERM,
0112         .doit = smc_nl_disable_seid,
0113     },
0114     {
0115         .cmd = SMC_NETLINK_DUMP_HS_LIMITATION,
0116         /* can be retrieved by unprivileged users */
0117         .dumpit = smc_nl_dump_hs_limitation,
0118     },
0119     {
0120         .cmd = SMC_NETLINK_ENABLE_HS_LIMITATION,
0121         .flags = GENL_ADMIN_PERM,
0122         .doit = smc_nl_enable_hs_limitation,
0123     },
0124     {
0125         .cmd = SMC_NETLINK_DISABLE_HS_LIMITATION,
0126         .flags = GENL_ADMIN_PERM,
0127         .doit = smc_nl_disable_hs_limitation,
0128     },
0129 };
0130
0131 static const struct nla_policy smc_gen_nl_policy[2] = {
0132     [SMC_CMD_MAX_ATTR]  = { .type = NLA_REJECT, },
0133 };
0134
0135 /* SMC_GENL family definition */
0136 struct genl_family smc_gen_nl_family __ro_after_init = {
0137     .hdrsize =  0,
0138     .name =     SMC_GENL_FAMILY_NAME,
0139     .version =  SMC_GENL_FAMILY_VERSION,
0140     .maxattr =  SMC_CMD_MAX_ATTR,
0141     .policy =   smc_gen_nl_policy,
0142     .netnsok =  true,
0143     .module =   THIS_MODULE,
0144     .ops =      smc_gen_nl_ops,
0145     .n_ops =    ARRAY_SIZE(smc_gen_nl_ops)
0146 };
0147
0148 int __init smc_nl_init(void)
0149 {
0150     return genl_register_family(&smc_gen_nl_family);
0151 }
0152
0153 void smc_nl_exit(void)
0154 {
0155     genl_unregister_family(&smc_gen_nl_family);
0156 }