Only three families use info->userhdr today and going forward
we discourage using fixed headers in new families.
So having the pointer to user header in struct genl_info
is an overkill. Compute the header pointer at runtime.
Reviewed-by: Johannes Berg <johannes@xxxxxxxxxxxxxxxx>
Reviewed-by: Jiri Pirko <jiri@xxxxxxxxxx>
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
---
CC: philipp.reisner@xxxxxxxxxx
CC: lars.ellenberg@xxxxxxxxxx
CC: christoph.boehmwalder@xxxxxxxxxx
CC: axboe@xxxxxxxxx
CC: pshelar@xxxxxxx
CC: jmaloy@xxxxxxxxxx
CC: ying.xue@xxxxxxxxxxxxx
CC: jacob.e.keller@xxxxxxxxx
CC: drbd-dev@xxxxxxxxxxxxxxxx
CC: linux-block@xxxxxxxxxxxxxxx
CC: dev@xxxxxxxxxxxxxxx
CC: tipc-discussion@xxxxxxxxxxxxxxxxxxxxx
---
drivers/block/drbd/drbd_nl.c | 9 +++++----
include/net/genetlink.h | 7 +++++--
net/netlink/genetlink.c | 1 -
net/openvswitch/conntrack.c | 2 +-
net/openvswitch/datapath.c | 29 ++++++++++++++++-------------
net/openvswitch/meter.c | 10 +++++-----
net/tipc/netlink_compat.c | 2 +-
7 files changed, 33 insertions(+), 27 deletions(-)
diff --git a/drivers/block/drbd/drbd_nl.c b/drivers/block/drbd/drbd_nl.c
index cddae6f4b00f..d3538bd83fb3 100644
--- a/drivers/block/drbd/drbd_nl.c
+++ b/drivers/block/drbd/drbd_nl.c
@@ -159,7 +159,7 @@ static int drbd_msg_sprintf_info(struct sk_buff *skb, const char *fmt, ...)
static int drbd_adm_prepare(struct drbd_config_context *adm_ctx,
struct sk_buff *skb, struct genl_info *info, unsigned flags)
{
- struct drbd_genlmsghdr *d_in = info->userhdr;
+ struct drbd_genlmsghdr *d_in = genl_info_userhdr(info);
const u8 cmd = info->genlhdr->cmd;
int err;
@@ -1396,8 +1396,9 @@ static void drbd_suspend_al(struct drbd_device *device)
static bool should_set_defaults(struct genl_info *info)
{
- unsigned flags = ((struct drbd_genlmsghdr*)info->userhdr)->flags;
- return 0 != (flags & DRBD_GENL_F_SET_DEFAULTS);
+ struct drbd_genlmsghdr *dh = genl_info_userhdr(info);
+
+ return 0 != (dh->flags & DRBD_GENL_F_SET_DEFAULTS);
}
static unsigned int drbd_al_extents_max(struct drbd_backing_dev *bdev)
@@ -4276,7 +4277,7 @@ static void device_to_info(struct device_info *info,
int drbd_adm_new_minor(struct sk_buff *skb, struct genl_info *info)
{
struct drbd_config_context adm_ctx;
- struct drbd_genlmsghdr *dh = info->userhdr;
+ struct drbd_genlmsghdr *dh = genl_info_userhdr(info);
enum drbd_ret_code retcode;
retcode = drbd_adm_prepare(&adm_ctx, skb, info, DRBD_ADM_NEED_RESOURCE);
diff --git a/include/net/genetlink.h b/include/net/genetlink.h
index 0366d0925596..9dc21ec15734 100644
--- a/include/net/genetlink.h
+++ b/include/net/genetlink.h
@@ -95,7 +95,6 @@ struct genl_family {
* @snd_portid: netlink portid of sender
* @nlhdr: netlink message header
* @genlhdr: generic netlink message header
- * @userhdr: user specific header
* @attrs: netlink attributes
* @_net: network namespace
* @user_ptr: user pointers
@@ -106,7 +105,6 @@ struct genl_info {
u32 snd_portid;
const struct nlmsghdr * nlhdr;
struct genlmsghdr * genlhdr;
- void * userhdr;
struct nlattr ** attrs;
possible_net_t _net;
void * user_ptr[2];
@@ -123,6 +121,11 @@ static inline void genl_info_net_set(struct genl_info *info, struct net *net)
write_pnet(&info->_net, net);
}
+static inline void *genl_info_userhdr(const struct genl_info *info)
+{
+ return (u8 *)info->genlhdr + GENL_HDRLEN;
+}
+
#define GENL_SET_ERR_MSG(info, msg) NL_SET_ERR_MSG((info)->extack, msg)
#define GENL_SET_ERR_MSG_FMT(info, msg, args...) \
diff --git a/net/netlink/genetlink.c b/net/netlink/genetlink.c
index 0d4285688ab9..f98f730bb245 100644
--- a/net/netlink/genetlink.c
+++ b/net/netlink/genetlink.c
@@ -943,7 +943,6 @@ static int genl_family_rcv_msg_doit(const struct genl_family *family,
info.snd_portid = NETLINK_CB(skb).portid;
info.nlhdr = nlh;
info.genlhdr = nlmsg_data(nlh);
- info.userhdr = nlmsg_data(nlh) + GENL_HDRLEN;
info.attrs = attrbuf;
info.extack = extack;
genl_info_net_set(&info, net);
diff --git a/net/openvswitch/conntrack.c b/net/openvswitch/conntrack.c
index 0cfa1e9482e6..0b9a785dea45 100644
--- a/net/openvswitch/conntrack.c
+++ b/net/openvswitch/conntrack.c
@@ -1605,7 +1605,7 @@ static struct sk_buff *
ovs_ct_limit_cmd_reply_start(struct genl_info *info, u8 cmd,
struct ovs_header **ovs_reply_header)
{
- struct ovs_header *ovs_header = info->userhdr;
+ struct ovs_header *ovs_header = genl_info_userhdr(info);
struct sk_buff *skb;
skb = genlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
diff --git a/net/openvswitch/datapath.c b/net/openvswitch/datapath.c
index d33cb739883f..0a974eeef76e 100644
--- a/net/openvswitch/datapath.c
+++ b/net/openvswitch/datapath.c
@@ -590,7 +590,7 @@ static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb,
static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
{
- struct ovs_header *ovs_header = info->userhdr;
+ struct ovs_header *ovs_header = genl_info_userhdr(info);
struct net *net = sock_net(skb->sk);
struct nlattr **a = info->attrs;
struct sw_flow_actions *acts;
@@ -967,7 +967,7 @@ static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info)
{
struct net *net = sock_net(skb->sk);
struct nlattr **a = info->attrs;
- struct ovs_header *ovs_header = info->userhdr;
+ struct ovs_header *ovs_header = genl_info_userhdr(info);
struct sw_flow *flow = NULL, *new_flow;
struct sw_flow_mask mask;
struct sk_buff *reply;
@@ -1214,7 +1214,7 @@ static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info)
{
struct net *net = sock_net(skb->sk);
struct nlattr **a = info->attrs;
- struct ovs_header *ovs_header = info->userhdr;
+ struct ovs_header *ovs_header = genl_info_userhdr(info);
struct sw_flow_key key;
struct sw_flow *flow;
struct sk_buff *reply = NULL;
@@ -1315,7 +1315,7 @@ static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info)
static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
{
struct nlattr **a = info->attrs;
- struct ovs_header *ovs_header = info->userhdr;
+ struct ovs_header *ovs_header = genl_info_userhdr(info);
struct net *net = sock_net(skb->sk);
struct sw_flow_key key;
struct sk_buff *reply;
@@ -1374,7 +1374,7 @@ static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
{
struct nlattr **a = info->attrs;
- struct ovs_header *ovs_header = info->userhdr;
+ struct ovs_header *ovs_header = genl_info_userhdr(info);
struct net *net = sock_net(skb->sk);
struct sw_flow_key key;
struct sk_buff *reply;
@@ -1642,7 +1642,7 @@ static void ovs_dp_reset_user_features(struct sk_buff *skb,
{
struct datapath *dp;
- dp = lookup_datapath(sock_net(skb->sk), info->userhdr,
+ dp = lookup_datapath(sock_net(skb->sk), genl_info_userhdr(info),
info->attrs);
if (IS_ERR(dp))
return;
@@ -1935,7 +1935,8 @@ static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
return -ENOMEM;
ovs_lock();
- dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
+ dp = lookup_datapath(sock_net(skb->sk), genl_info_userhdr(info),
+ info->attrs);
err = PTR_ERR(dp);
if (IS_ERR(dp))
goto err_unlock_free;
@@ -1968,7 +1969,8 @@ static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
return -ENOMEM;
ovs_lock();
- dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
+ dp = lookup_datapath(sock_net(skb->sk), genl_info_userhdr(info),
+ info->attrs);
err = PTR_ERR(dp);
if (IS_ERR(dp))
goto err_unlock_free;
@@ -2003,7 +2005,8 @@ static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
return -ENOMEM;
ovs_lock();
- dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
+ dp = lookup_datapath(sock_net(skb->sk), genl_info_userhdr(info),
+ info->attrs);
if (IS_ERR(dp)) {
err = PTR_ERR(dp);
goto err_unlock_free;
@@ -2246,7 +2249,7 @@ static void ovs_update_headroom(struct datapath *dp, unsigned int new_headroom)
static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
{
struct nlattr **a = info->attrs;
- struct ovs_header *ovs_header = info->userhdr;
+ struct ovs_header *ovs_header = genl_info_userhdr(info);
struct vport_parms parms;
struct sk_buff *reply;
struct vport *vport;
@@ -2348,7 +2351,7 @@ static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
return -ENOMEM;
ovs_lock();
- vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
+ vport = lookup_vport(sock_net(skb->sk), genl_info_userhdr(info), a);
err = PTR_ERR(vport);
if (IS_ERR(vport))
goto exit_unlock_free;
@@ -2404,7 +2407,7 @@ static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
return -ENOMEM;
ovs_lock();
- vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
+ vport = lookup_vport(sock_net(skb->sk), genl_info_userhdr(info), a);
err = PTR_ERR(vport);
if (IS_ERR(vport))
goto exit_unlock_free;
@@ -2447,7 +2450,7 @@ static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
{
struct nlattr **a = info->attrs;
- struct ovs_header *ovs_header = info->userhdr;
+ struct ovs_header *ovs_header = genl_info_userhdr(info);
struct sk_buff *reply;
struct vport *vport;
int err;
diff --git a/net/openvswitch/meter.c b/net/openvswitch/meter.c
index c4ebf810e4b1..cc08e0403909 100644
--- a/net/openvswitch/meter.c
+++ b/net/openvswitch/meter.c
@@ -211,7 +211,7 @@ ovs_meter_cmd_reply_start(struct genl_info *info, u8 cmd,
struct ovs_header **ovs_reply_header)
{
struct sk_buff *skb;
- struct ovs_header *ovs_header = info->userhdr;
+ struct ovs_header *ovs_header = genl_info_userhdr(info);
skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
if (!skb)
@@ -272,7 +272,7 @@ static int ovs_meter_cmd_reply_stats(struct sk_buff *reply, u32 meter_id,
static int ovs_meter_cmd_features(struct sk_buff *skb, struct genl_info *info)
{
- struct ovs_header *ovs_header = info->userhdr;
+ struct ovs_header *ovs_header = genl_info_userhdr(info);
struct ovs_header *ovs_reply_header;
struct nlattr *nla, *band_nla;
struct sk_buff *reply;
@@ -409,7 +409,7 @@ static int ovs_meter_cmd_set(struct sk_buff *skb, struct genl_info *info)
struct dp_meter *meter, *old_meter;
struct sk_buff *reply;
struct ovs_header *ovs_reply_header;
- struct ovs_header *ovs_header = info->userhdr;
+ struct ovs_header *ovs_header = genl_info_userhdr(info);
struct dp_meter_table *meter_tbl;
struct datapath *dp;
int err;
@@ -482,7 +482,7 @@ static int ovs_meter_cmd_set(struct sk_buff *skb, struct genl_info *info)
static int ovs_meter_cmd_get(struct sk_buff *skb, struct genl_info *info)
{
- struct ovs_header *ovs_header = info->userhdr;
+ struct ovs_header *ovs_header = genl_info_userhdr(info);
struct ovs_header *ovs_reply_header;
struct nlattr **a = info->attrs;
struct dp_meter *meter;
@@ -535,7 +535,7 @@ static int ovs_meter_cmd_get(struct sk_buff *skb, struct genl_info *info)
static int ovs_meter_cmd_del(struct sk_buff *skb, struct genl_info *info)
{
- struct ovs_header *ovs_header = info->userhdr;
+ struct ovs_header *ovs_header = genl_info_userhdr(info);
struct ovs_header *ovs_reply_header;
struct nlattr **a = info->attrs;
struct dp_meter *old_meter;
diff --git a/net/tipc/netlink_compat.c b/net/tipc/netlink_compat.c
index 9b47c8409231..299cd6754f14 100644
--- a/net/tipc/netlink_compat.c
+++ b/net/tipc/netlink_compat.c
@@ -1294,7 +1294,7 @@ static int tipc_nl_compat_recv(struct sk_buff *skb, struct genl_info *info)
struct tipc_nl_compat_msg msg;
struct nlmsghdr *req_nlh;
struct nlmsghdr *rep_nlh;
- struct tipc_genlmsghdr *req_userhdr = info->userhdr;
+ struct tipc_genlmsghdr *req_userhdr = genl_info_userhdr(info);
memset(&msg, 0, sizeof(msg));
--
2.41.0
