Repository : ssh://git@open-mesh.org/batman-adv

On branch : master

commit 2b20eb572f271edca0d0fd1abd5350876c315d28 Author: Matthias Schiffer mschiffer@universe-factory.net Date: Mon May 9 18:41:08 2016 +0200

batman-adv: add generic netlink family for batman-adv

debugfs is currently severely broken virtually everywhere in the kernel where files are dynamically added and removed (see http://lkml.iu.edu/hypermail/linux/kernel/1506.1/02196.html for some details). In addition to that, debugfs is not namespace-aware.

Instead of adding new debugfs entries, the whole infrastructure should be moved to netlink. This will fix the long standing problem of large buffers for debug tables and hard to parse text files.

Signed-off-by: Matthias Schiffer mschiffer@universe-factory.net Signed-off-by: Andrew Lunn andrew@lunn.ch [sven.eckelmann@open-mesh.com: Strip down patch to only add genl family, add missing kerneldoc] Signed-off-by: Sven Eckelmann sven.eckelmann@open-mesh.com Signed-off-by: Marek Lindner mareklindner@neomailbox.ch

2b20eb572f271edca0d0fd1abd5350876c315d28 MAINTAINERS | 1 + Makefile | 1 + .../{linux/if_ether.h => net/genetlink.h} | 17 ++++--- include/uapi/linux/batman_adv.h | 53 ++++++++++++++++++++ net/batman-adv/Makefile | 1 + net/batman-adv/main.c | 3 ++ net/batman-adv/netlink.c | 57 ++++++++++++++++++++++ .../linux/export.h => net/batman-adv/netlink.h | 19 +++----- 8 files changed, 132 insertions(+), 20 deletions(-)

diff --git a/MAINTAINERS b/MAINTAINERS index 7e47274..ff0322d 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -9,4 +9,5 @@ S: Maintained F: Documentation/ABI/testing/sysfs-class-net-batman-adv F: Documentation/ABI/testing/sysfs-class-net-mesh F: Documentation/networking/batman-adv.txt +F: include/uapi/linux/batman_adv.h F: net/batman-adv/ diff --git a/Makefile b/Makefile index 5d2c058..f17bde5 100644 --- a/Makefile +++ b/Makefile @@ -45,6 +45,7 @@ REVISION= $(shell if [ -d "$(PWD)/.git" ]; then \ fi) export NOSTDINC_FLAGS := \ -I$(PWD)/compat-include/ \ + -I$(PWD)/include/ \ -include $(PWD)/compat.h \ $(CFLAGS)

diff --git a/compat-include/linux/if_ether.h b/compat-include/net/genetlink.h similarity index 63% copy from compat-include/linux/if_ether.h copy to compat-include/net/genetlink.h index 79c8526..bf1ba3d 100644 --- a/compat-include/linux/if_ether.h +++ b/compat-include/net/genetlink.h @@ -1,4 +1,4 @@ -/* Copyright (C) 2007-2016 B.A.T.M.A.N. contributors: +/* Copyright (C) 2007-2016 B.A.T.M.A.N. contributors: * * Marek Lindner, Simon Wunderlich * @@ -18,16 +18,17 @@ * of the Linux kernel. */

-#ifndef _NET_BATMAN_ADV_COMPAT_LINUX_IF_ETHER_H_ -#define _NET_BATMAN_ADV_COMPAT_LINUX_IF_ETHER_H_ +#ifndef _NET_BATMAN_ADV_COMPAT_NET_GENETLINK_H_ +#define _NET_BATMAN_ADV_COMPAT_NET_GENETLINK_H_

#include <linux/version.h> -#include_next <linux/if_ether.h> +#include_next <net/genetlink.h>

-#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 8, 0) +#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 13, 0)

-#define ETH_P_BATMAN 0x4305 +#define genl_register_family_with_ops(family, ops) \ + genl_register_family_with_ops((family), (ops), ARRAY_SIZE(ops))

-#endif /* < KERNEL_VERSION(3, 8, 0) */ +#endif /* < KERNEL_VERSION(3, 13, 0) */

-#endif /* _NET_BATMAN_ADV_COMPAT_LINUX_IF_ETHER_H_ */ +#endif /* _NET_BATMAN_ADV_COMPAT_NET_GENETLINK_H_ */ diff --git a/include/uapi/linux/batman_adv.h b/include/uapi/linux/batman_adv.h new file mode 100644 index 0000000..ba611a7 --- /dev/null +++ b/include/uapi/linux/batman_adv.h @@ -0,0 +1,53 @@ +/* Copyright (C) 2016 B.A.T.M.A.N. contributors: + * + * Matthias Schiffer + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of version 2 of the GNU General Public + * License as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see http://www.gnu.org/licenses/. + */ + +#ifndef _UAPI_LINUX_BATMAN_ADV_H_ +#define _UAPI_LINUX_BATMAN_ADV_H_ + +#define BATADV_NL_NAME "batadv" + +/** + * enum batadv_nl_attrs - batman-adv netlink attributes + * + * @BATADV_ATTR_UNSPEC: unspecified attribute to catch errors + * @__BATADV_ATTR_AFTER_LAST: internal use + * @NUM_BATADV_ATTR: total number of batadv_nl_attrs available + * @BATADV_ATTR_MAX: highest attribute number currently defined + */ +enum batadv_nl_attrs { + BATADV_ATTR_UNSPEC, + /* add attributes above here, update the policy in netlink.c */ + __BATADV_ATTR_AFTER_LAST, + NUM_BATADV_ATTR = __BATADV_ATTR_AFTER_LAST, + BATADV_ATTR_MAX = __BATADV_ATTR_AFTER_LAST - 1 +}; + +/** + * enum batadv_nl_commands - supported batman-adv netlink commands + * + * @BATADV_CMD_UNSPEC: unspecified command to catch errors + * @__BATADV_CMD_AFTER_LAST: internal use + * @BATADV_CMD_MAX: highest used command number + */ +enum batadv_nl_commands { + BATADV_CMD_UNSPEC, + /* add new commands above here */ + __BATADV_CMD_AFTER_LAST, + BATADV_CMD_MAX = __BATADV_CMD_AFTER_LAST - 1 +}; + +#endif /* _UAPI_LINUX_BATMAN_ADV_H_ */ diff --git a/net/batman-adv/Makefile b/net/batman-adv/Makefile index 797cf2f..4e5adba 100644 --- a/net/batman-adv/Makefile +++ b/net/batman-adv/Makefile @@ -33,6 +33,7 @@ batman-adv-y += hash.o batman-adv-y += icmp_socket.o batman-adv-y += main.o batman-adv-$(CONFIG_BATMAN_ADV_MCAST) += multicast.o +batman-adv-y += netlink.o batman-adv-$(CONFIG_BATMAN_ADV_NC) += network-coding.o batman-adv-y += originator.o batman-adv-y += routing.o diff --git a/net/batman-adv/main.c b/net/batman-adv/main.c index 627d14e..e78b318 100644 --- a/net/batman-adv/main.c +++ b/net/batman-adv/main.c @@ -57,6 +57,7 @@ #include "hard-interface.h" #include "icmp_socket.h" #include "multicast.h" +#include "netlink.h" #include "network-coding.h" #include "originator.h" #include "packet.h" @@ -101,6 +102,7 @@ static int __init batadv_init(void)

register_netdevice_notifier(&batadv_hard_if_notifier); rtnl_link_register(&batadv_link_ops); + batadv_netlink_register();

pr_info("B.A.T.M.A.N. advanced %s (compatibility version %i) loaded\n", BATADV_SOURCE_VERSION, BATADV_COMPAT_VERSION); @@ -111,6 +113,7 @@ static int __init batadv_init(void) static void __exit batadv_exit(void) { batadv_debugfs_destroy(); + batadv_netlink_unregister(); rtnl_link_unregister(&batadv_link_ops); unregister_netdevice_notifier(&batadv_hard_if_notifier); batadv_hardif_remove_interfaces(); diff --git a/net/batman-adv/netlink.c b/net/batman-adv/netlink.c new file mode 100644 index 0000000..6b92983 --- /dev/null +++ b/net/batman-adv/netlink.c @@ -0,0 +1,57 @@ +/* Copyright (C) 2016 B.A.T.M.A.N. contributors: + * + * Matthias Schiffer + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of version 2 of the GNU General Public + * License as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see http://www.gnu.org/licenses/. + */ + +#include "main.h" +#include "netlink.h" + +#include <linux/genetlink.h> +#include <linux/init.h> +#include <linux/printk.h> +#include <net/genetlink.h> +#include <uapi/linux/batman_adv.h> + +static struct genl_family batadv_netlink_family = { + .id = GENL_ID_GENERATE, + .hdrsize = 0, + .name = BATADV_NL_NAME, + .version = 1, + .maxattr = BATADV_ATTR_MAX, +}; + +static struct genl_ops batadv_netlink_ops[] = { +}; + +/** + * batadv_netlink_register - register batadv genl netlink family + */ +void __init batadv_netlink_register(void) +{ + int ret; + + ret = genl_register_family_with_ops(&batadv_netlink_family, + batadv_netlink_ops); + if (ret) + pr_warn("unable to register netlink family"); +} + +/** + * batadv_netlink_unregister - unregister batadv genl netlink family + */ +void batadv_netlink_unregister(void) +{ + genl_unregister_family(&batadv_netlink_family); +} diff --git a/compat-include/linux/export.h b/net/batman-adv/netlink.h similarity index 56% copy from compat-include/linux/export.h copy to net/batman-adv/netlink.h index c43b35b..fa152a8 100644 --- a/compat-include/linux/export.h +++ b/net/batman-adv/netlink.h @@ -1,6 +1,6 @@ -/* Copyright (C) 2007-2016 B.A.T.M.A.N. contributors: +/* Copyright (C) 2016 B.A.T.M.A.N. contributors: * - * Marek Lindner, Simon Wunderlich + * Matthias Schiffer * * This program is free software; you can redistribute it and/or * modify it under the terms of version 2 of the GNU General Public @@ -13,17 +13,12 @@ * * You should have received a copy of the GNU General Public License * along with this program; if not, see http://www.gnu.org/licenses/. - * - * This file contains macros for maintaining compatibility with older versions - * of the Linux kernel. */

-#ifndef _NET_BATMAN_ADV_COMPAT_LINUX_EXPORT_H_ -#define _NET_BATMAN_ADV_COMPAT_LINUX_EXPORT_H_ +#ifndef _NET_BATMAN_ADV_NETLINK_H_ +#define _NET_BATMAN_ADV_NETLINK_H_

-#include <linux/version.h> -#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 2, 0) -#include_next <linux/export.h> -#endif +void batadv_netlink_register(void); +void batadv_netlink_unregister(void);

-#endif /* _NET_BATMAN_ADV_COMPAT_LINUX_EXPORT_H_ */ +#endif /* _NET_BATMAN_ADV_NETLINK_H_ */