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![Jakub Kicinski](/assets/img/avatar_default.png)
We had historically not checked that genlmsghdr.reserved is 0 on input which prevents us from using those precious bytes in the future. One use case would be to extend the cmd field, which is currently just 8 bits wide and 256 is not a lot of commands for some core families. To make sure that new families do the right thing by default put the onus of opting out of validation on existing families. Signed-off-by: Jakub Kicinski <kuba@kernel.org> Acked-by: Paul Moore <paul@paul-moore.com> (NetLabel) Signed-off-by: David S. Miller <davem@davemloft.net>
157 lines
3.6 KiB
C
157 lines
3.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Shared Memory Communications over RDMA (SMC-R) and RoCE
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*
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* Generic netlink support functions to interact with SMC module
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*
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* Copyright IBM Corp. 2020
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*
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* Author(s): Guvenc Gulce <guvenc@linux.ibm.com>
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*/
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#include <linux/module.h>
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#include <linux/list.h>
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#include <linux/ctype.h>
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#include <linux/mutex.h>
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#include <linux/if.h>
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#include <linux/smc.h>
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#include "smc_core.h"
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#include "smc_ism.h"
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#include "smc_ib.h"
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#include "smc_clc.h"
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#include "smc_stats.h"
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#include "smc_netlink.h"
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const struct nla_policy
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smc_gen_ueid_policy[SMC_NLA_EID_TABLE_MAX + 1] = {
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[SMC_NLA_EID_TABLE_UNSPEC] = { .type = NLA_UNSPEC },
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[SMC_NLA_EID_TABLE_ENTRY] = { .type = NLA_STRING,
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.len = SMC_MAX_EID_LEN,
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},
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};
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#define SMC_CMD_MAX_ATTR 1
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/* SMC_GENL generic netlink operation definition */
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static const struct genl_ops smc_gen_nl_ops[] = {
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{
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.cmd = SMC_NETLINK_GET_SYS_INFO,
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/* can be retrieved by unprivileged users */
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.dumpit = smc_nl_get_sys_info,
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},
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{
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.cmd = SMC_NETLINK_GET_LGR_SMCR,
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/* can be retrieved by unprivileged users */
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.dumpit = smcr_nl_get_lgr,
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},
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{
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.cmd = SMC_NETLINK_GET_LINK_SMCR,
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/* can be retrieved by unprivileged users */
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.dumpit = smcr_nl_get_link,
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},
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{
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.cmd = SMC_NETLINK_GET_LGR_SMCD,
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/* can be retrieved by unprivileged users */
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.dumpit = smcd_nl_get_lgr,
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},
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{
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.cmd = SMC_NETLINK_GET_DEV_SMCD,
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/* can be retrieved by unprivileged users */
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.dumpit = smcd_nl_get_device,
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},
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{
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.cmd = SMC_NETLINK_GET_DEV_SMCR,
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/* can be retrieved by unprivileged users */
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.dumpit = smcr_nl_get_device,
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},
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{
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.cmd = SMC_NETLINK_GET_STATS,
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/* can be retrieved by unprivileged users */
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.dumpit = smc_nl_get_stats,
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},
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{
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.cmd = SMC_NETLINK_GET_FBACK_STATS,
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/* can be retrieved by unprivileged users */
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.dumpit = smc_nl_get_fback_stats,
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},
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{
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.cmd = SMC_NETLINK_DUMP_UEID,
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/* can be retrieved by unprivileged users */
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.dumpit = smc_nl_dump_ueid,
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},
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{
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.cmd = SMC_NETLINK_ADD_UEID,
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.flags = GENL_ADMIN_PERM,
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.doit = smc_nl_add_ueid,
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.policy = smc_gen_ueid_policy,
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},
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{
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.cmd = SMC_NETLINK_REMOVE_UEID,
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.flags = GENL_ADMIN_PERM,
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.doit = smc_nl_remove_ueid,
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.policy = smc_gen_ueid_policy,
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},
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{
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.cmd = SMC_NETLINK_FLUSH_UEID,
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.flags = GENL_ADMIN_PERM,
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.doit = smc_nl_flush_ueid,
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},
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{
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.cmd = SMC_NETLINK_DUMP_SEID,
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/* can be retrieved by unprivileged users */
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.dumpit = smc_nl_dump_seid,
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},
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{
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.cmd = SMC_NETLINK_ENABLE_SEID,
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.flags = GENL_ADMIN_PERM,
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.doit = smc_nl_enable_seid,
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},
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{
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.cmd = SMC_NETLINK_DISABLE_SEID,
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.flags = GENL_ADMIN_PERM,
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.doit = smc_nl_disable_seid,
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},
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{
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.cmd = SMC_NETLINK_DUMP_HS_LIMITATION,
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/* can be retrieved by unprivileged users */
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.dumpit = smc_nl_dump_hs_limitation,
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},
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{
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.cmd = SMC_NETLINK_ENABLE_HS_LIMITATION,
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.flags = GENL_ADMIN_PERM,
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.doit = smc_nl_enable_hs_limitation,
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},
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{
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.cmd = SMC_NETLINK_DISABLE_HS_LIMITATION,
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.flags = GENL_ADMIN_PERM,
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.doit = smc_nl_disable_hs_limitation,
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},
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};
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static const struct nla_policy smc_gen_nl_policy[2] = {
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[SMC_CMD_MAX_ATTR] = { .type = NLA_REJECT, },
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};
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/* SMC_GENL family definition */
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struct genl_family smc_gen_nl_family __ro_after_init = {
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.hdrsize = 0,
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.name = SMC_GENL_FAMILY_NAME,
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.version = SMC_GENL_FAMILY_VERSION,
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.maxattr = SMC_CMD_MAX_ATTR,
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.policy = smc_gen_nl_policy,
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.netnsok = true,
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.module = THIS_MODULE,
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.ops = smc_gen_nl_ops,
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.n_ops = ARRAY_SIZE(smc_gen_nl_ops),
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.resv_start_op = SMC_NETLINK_DISABLE_HS_LIMITATION + 1,
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};
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int __init smc_nl_init(void)
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{
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return genl_register_family(&smc_gen_nl_family);
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}
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void smc_nl_exit(void)
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{
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genl_unregister_family(&smc_gen_nl_family);
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}
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