Commit 3c572145 authored by Karsten Graul's avatar Karsten Graul Committed by David S. Miller
Browse files

net/smc: add generic netlink support for system EID 



With SMC-Dv2 users can configure if the static system EID should be used
during CLC handshake, or if only user EIDs are allowed.
Add generic netlink support to enable and disable the system EID, and
to retrieve the system EID and its current enabled state.

Signed-off-by: default avatarKarsten Graul <kgraul@linux.ibm.com>
Reviewed-by: default avatarGuvenc Gulce <guvenc@linux.ibm.com>
Signed-off-by: default avatarGuvenc Gulce <guvenc@linux.ibm.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 11a26c59

include/uapi/linux/smc.h

+12 −0
Original line number Diff line number Diff line
@@ -56,6 +56,9 @@ enum { 
	SMC_NETLINK_ADD_UEID,

	SMC_NETLINK_REMOVE_UEID,

	SMC_NETLINK_FLUSH_UEID,

	SMC_NETLINK_DUMP_SEID,

	SMC_NETLINK_ENABLE_SEID,

	SMC_NETLINK_DISABLE_SEID,

};



/* SMC_GENL_FAMILY top level attributes */
@@ -257,4 +260,13 @@ enum { 
	__SMC_NLA_EID_TABLE_MAX,

	SMC_NLA_EID_TABLE_MAX = __SMC_NLA_EID_TABLE_MAX - 1

};



/* SMC_NETLINK_SEID attributes */

enum {

	SMC_NLA_SEID_UNSPEC,

	SMC_NLA_SEID_ENTRY,	/* string */

	SMC_NLA_SEID_ENABLED,	/* u8 */

	__SMC_NLA_SEID_TABLE_MAX,

	SMC_NLA_SEID_TABLE_MAX = __SMC_NLA_SEID_TABLE_MAX - 1

};

#endif /* _UAPI_LINUX_SMC_H */

net/smc/smc_clc.c

+62 −0
Original line number Diff line number Diff line
@@ -143,6 +143,10 @@ static int smc_clc_ueid_remove(char *ueid) 
			rc = 0;

		}

	}

	if (!rc && !smc_clc_eid_table.ueid_cnt) {

		smc_clc_eid_table.seid_enabled = 1;

		rc = -EAGAIN;	/* indicate success and enabling of seid */

	}

	write_unlock(&smc_clc_eid_table.lock);

	return rc;

}
@@ -216,6 +220,64 @@ int smc_nl_dump_ueid(struct sk_buff *skb, struct netlink_callback *cb) 
	return skb->len;

}



int smc_nl_dump_seid(struct sk_buff *skb, struct netlink_callback *cb)

{

	struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb);

	char seid_str[SMC_MAX_EID_LEN + 1];

	u8 seid_enabled;

	void *hdr;

	u8 *seid;



	if (cb_ctx->pos[0])

		return skb->len;



	hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,

			  &smc_gen_nl_family, NLM_F_MULTI,

			  SMC_NETLINK_DUMP_SEID);

	if (!hdr)

		return -ENOMEM;

	if (!smc_ism_is_v2_capable())

		goto end;



	smc_ism_get_system_eid(&seid);

	snprintf(seid_str, sizeof(seid_str), "%s", seid);

	if (nla_put_string(skb, SMC_NLA_SEID_ENTRY, seid_str))

		goto err;

	read_lock(&smc_clc_eid_table.lock);

	seid_enabled = smc_clc_eid_table.seid_enabled;

	read_unlock(&smc_clc_eid_table.lock);

	if (nla_put_u8(skb, SMC_NLA_SEID_ENABLED, seid_enabled))

		goto err;

end:

	genlmsg_end(skb, hdr);

	cb_ctx->pos[0]++;

	return skb->len;

err:

	genlmsg_cancel(skb, hdr);

	return -EMSGSIZE;

}



int smc_nl_enable_seid(struct sk_buff *skb, struct genl_info *info)

{

	write_lock(&smc_clc_eid_table.lock);

	smc_clc_eid_table.seid_enabled = 1;

	write_unlock(&smc_clc_eid_table.lock);

	return 0;

}



int smc_nl_disable_seid(struct sk_buff *skb, struct genl_info *info)

{

	int rc = 0;



	write_lock(&smc_clc_eid_table.lock);

	if (!smc_clc_eid_table.ueid_cnt)

		rc = -ENOENT;

	else

		smc_clc_eid_table.seid_enabled = 0;

	write_unlock(&smc_clc_eid_table.lock);

	return rc;

}



static bool _smc_clc_match_ueid(u8 *peer_ueid)

{

	struct smc_clc_eid_entry *tmp_ueid;

net/smc/smc_clc.h

+3 −0
Original line number Diff line number Diff line
@@ -347,5 +347,8 @@ int smc_nl_dump_ueid(struct sk_buff *skb, struct netlink_callback *cb); 
int smc_nl_add_ueid(struct sk_buff *skb, struct genl_info *info);

int smc_nl_remove_ueid(struct sk_buff *skb, struct genl_info *info);

int smc_nl_flush_ueid(struct sk_buff *skb, struct genl_info *info);

int smc_nl_dump_seid(struct sk_buff *skb, struct netlink_callback *cb);

int smc_nl_enable_seid(struct sk_buff *skb, struct genl_info *info);

int smc_nl_disable_seid(struct sk_buff *skb, struct genl_info *info);



#endif

net/smc/smc_netlink.c

+15 −0
Original line number Diff line number Diff line
@@ -96,6 +96,21 @@ static const struct genl_ops smc_gen_nl_ops[] = { 
		.flags = GENL_ADMIN_PERM,

		.doit = smc_nl_flush_ueid,

	},

	{

		.cmd = SMC_NETLINK_DUMP_SEID,

		/* can be retrieved by unprivileged users */

		.dumpit = smc_nl_dump_seid,

	},

	{

		.cmd = SMC_NETLINK_ENABLE_SEID,

		.flags = GENL_ADMIN_PERM,

		.doit = smc_nl_enable_seid,

	},

	{

		.cmd = SMC_NETLINK_DISABLE_SEID,

		.flags = GENL_ADMIN_PERM,

		.doit = smc_nl_disable_seid,

	},

};



static const struct nla_policy smc_gen_nl_policy[2] = {