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genetlink: remove userhdr from struct genl_info 

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@sipsolutions.net>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Reviewed-by: Aaron Conole <aconole@redhat.com>
Link: https://lore.kernel.org/r/20230814214723.2924989-4-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Jakub Kicinski 2023-08-14 14:47:16 -07:00
parent fde9bd4a4d
commit bffcc6882a
7 changed files with 33 additions and 27 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
drivers/block/drbd/drbd_nl.c
View File

@ -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);

7
include/net/genetlink.h
View File

@ -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...) \

1
net/netlink/genetlink.c
View File

@ -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);

2
net/openvswitch/conntrack.c
View File

@ -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);

29
net/openvswitch/datapath.c
View File

@ -590,7 +590,7 @@ out:
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 @@ error:
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 @@ unlock:
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 @@ exit_unlock_free:
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;

10
net/openvswitch/meter.c
View File

@ -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 @@ error:
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 @@ exit_free_meter:
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 @@ exit_unlock:
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;

2
net/tipc/netlink_compat.c
View File

@ -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));