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>
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@ -159,7 +159,7 @@ static int drbd_msg_sprintf_info(struct sk_buff *skb, const char *fmt, ...)
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static int drbd_adm_prepare(struct drbd_config_context *adm_ctx,
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struct sk_buff *skb, struct genl_info *info, unsigned flags)
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{
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struct drbd_genlmsghdr *d_in = info->userhdr;
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struct drbd_genlmsghdr *d_in = genl_info_userhdr(info);
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const u8 cmd = info->genlhdr->cmd;
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int err;
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@ -1396,8 +1396,9 @@ static void drbd_suspend_al(struct drbd_device *device)
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static bool should_set_defaults(struct genl_info *info)
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{
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unsigned flags = ((struct drbd_genlmsghdr*)info->userhdr)->flags;
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return 0 != (flags & DRBD_GENL_F_SET_DEFAULTS);
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struct drbd_genlmsghdr *dh = genl_info_userhdr(info);
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return 0 != (dh->flags & DRBD_GENL_F_SET_DEFAULTS);
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}
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static unsigned int drbd_al_extents_max(struct drbd_backing_dev *bdev)
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@ -4276,7 +4277,7 @@ static void device_to_info(struct device_info *info,
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int drbd_adm_new_minor(struct sk_buff *skb, struct genl_info *info)
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{
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struct drbd_config_context adm_ctx;
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struct drbd_genlmsghdr *dh = info->userhdr;
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struct drbd_genlmsghdr *dh = genl_info_userhdr(info);
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enum drbd_ret_code retcode;
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retcode = drbd_adm_prepare(&adm_ctx, skb, info, DRBD_ADM_NEED_RESOURCE);
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@ -95,7 +95,6 @@ struct genl_family {
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* @snd_portid: netlink portid of sender
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* @nlhdr: netlink message header
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* @genlhdr: generic netlink message header
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* @userhdr: user specific header
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* @attrs: netlink attributes
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* @_net: network namespace
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* @user_ptr: user pointers
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@ -106,7 +105,6 @@ struct genl_info {
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u32 snd_portid;
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const struct nlmsghdr * nlhdr;
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struct genlmsghdr * genlhdr;
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void * userhdr;
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struct nlattr ** attrs;
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possible_net_t _net;
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void * user_ptr[2];
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@ -123,6 +121,11 @@ static inline void genl_info_net_set(struct genl_info *info, struct net *net)
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write_pnet(&info->_net, net);
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}
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static inline void *genl_info_userhdr(const struct genl_info *info)
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{
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return (u8 *)info->genlhdr + GENL_HDRLEN;
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}
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#define GENL_SET_ERR_MSG(info, msg) NL_SET_ERR_MSG((info)->extack, msg)
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#define GENL_SET_ERR_MSG_FMT(info, msg, args...) \
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@ -943,7 +943,6 @@ static int genl_family_rcv_msg_doit(const struct genl_family *family,
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info.snd_portid = NETLINK_CB(skb).portid;
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info.nlhdr = nlh;
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info.genlhdr = nlmsg_data(nlh);
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info.userhdr = nlmsg_data(nlh) + GENL_HDRLEN;
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info.attrs = attrbuf;
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info.extack = extack;
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genl_info_net_set(&info, net);
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@ -1605,7 +1605,7 @@ static struct sk_buff *
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ovs_ct_limit_cmd_reply_start(struct genl_info *info, u8 cmd,
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struct ovs_header **ovs_reply_header)
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{
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struct ovs_header *ovs_header = info->userhdr;
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struct ovs_header *ovs_header = genl_info_userhdr(info);
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struct sk_buff *skb;
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skb = genlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
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@ -590,7 +590,7 @@ out:
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static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
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{
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struct ovs_header *ovs_header = info->userhdr;
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struct ovs_header *ovs_header = genl_info_userhdr(info);
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struct net *net = sock_net(skb->sk);
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struct nlattr **a = info->attrs;
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struct sw_flow_actions *acts;
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@ -967,7 +967,7 @@ static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info)
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{
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struct net *net = sock_net(skb->sk);
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struct nlattr **a = info->attrs;
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struct ovs_header *ovs_header = info->userhdr;
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struct ovs_header *ovs_header = genl_info_userhdr(info);
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struct sw_flow *flow = NULL, *new_flow;
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struct sw_flow_mask mask;
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struct sk_buff *reply;
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@ -1214,7 +1214,7 @@ static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info)
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{
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struct net *net = sock_net(skb->sk);
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struct nlattr **a = info->attrs;
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struct ovs_header *ovs_header = info->userhdr;
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struct ovs_header *ovs_header = genl_info_userhdr(info);
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struct sw_flow_key key;
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struct sw_flow *flow;
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struct sk_buff *reply = NULL;
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@ -1315,7 +1315,7 @@ error:
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static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
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{
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struct nlattr **a = info->attrs;
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struct ovs_header *ovs_header = info->userhdr;
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struct ovs_header *ovs_header = genl_info_userhdr(info);
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struct net *net = sock_net(skb->sk);
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struct sw_flow_key key;
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struct sk_buff *reply;
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@ -1374,7 +1374,7 @@ unlock:
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static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
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{
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struct nlattr **a = info->attrs;
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struct ovs_header *ovs_header = info->userhdr;
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struct ovs_header *ovs_header = genl_info_userhdr(info);
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struct net *net = sock_net(skb->sk);
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struct sw_flow_key key;
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struct sk_buff *reply;
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@ -1642,7 +1642,7 @@ static void ovs_dp_reset_user_features(struct sk_buff *skb,
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{
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struct datapath *dp;
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dp = lookup_datapath(sock_net(skb->sk), info->userhdr,
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dp = lookup_datapath(sock_net(skb->sk), genl_info_userhdr(info),
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info->attrs);
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if (IS_ERR(dp))
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return;
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@ -1935,7 +1935,8 @@ static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
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return -ENOMEM;
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ovs_lock();
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dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
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dp = lookup_datapath(sock_net(skb->sk), genl_info_userhdr(info),
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info->attrs);
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err = PTR_ERR(dp);
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if (IS_ERR(dp))
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goto err_unlock_free;
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@ -1968,7 +1969,8 @@ static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
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return -ENOMEM;
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ovs_lock();
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dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
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dp = lookup_datapath(sock_net(skb->sk), genl_info_userhdr(info),
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info->attrs);
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err = PTR_ERR(dp);
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if (IS_ERR(dp))
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goto err_unlock_free;
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@ -2003,7 +2005,8 @@ static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
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return -ENOMEM;
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ovs_lock();
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dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
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dp = lookup_datapath(sock_net(skb->sk), genl_info_userhdr(info),
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info->attrs);
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if (IS_ERR(dp)) {
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err = PTR_ERR(dp);
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goto err_unlock_free;
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@ -2246,7 +2249,7 @@ static void ovs_update_headroom(struct datapath *dp, unsigned int new_headroom)
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static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
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{
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struct nlattr **a = info->attrs;
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struct ovs_header *ovs_header = info->userhdr;
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struct ovs_header *ovs_header = genl_info_userhdr(info);
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struct vport_parms parms;
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struct sk_buff *reply;
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struct vport *vport;
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@ -2348,7 +2351,7 @@ static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
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return -ENOMEM;
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ovs_lock();
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vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
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vport = lookup_vport(sock_net(skb->sk), genl_info_userhdr(info), a);
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err = PTR_ERR(vport);
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if (IS_ERR(vport))
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goto exit_unlock_free;
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@ -2404,7 +2407,7 @@ static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
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return -ENOMEM;
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ovs_lock();
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vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
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vport = lookup_vport(sock_net(skb->sk), genl_info_userhdr(info), a);
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err = PTR_ERR(vport);
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if (IS_ERR(vport))
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goto exit_unlock_free;
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@ -2447,7 +2450,7 @@ exit_unlock_free:
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static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
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{
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struct nlattr **a = info->attrs;
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struct ovs_header *ovs_header = info->userhdr;
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struct ovs_header *ovs_header = genl_info_userhdr(info);
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struct sk_buff *reply;
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struct vport *vport;
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int err;
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@ -211,7 +211,7 @@ ovs_meter_cmd_reply_start(struct genl_info *info, u8 cmd,
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struct ovs_header **ovs_reply_header)
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{
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struct sk_buff *skb;
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struct ovs_header *ovs_header = info->userhdr;
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struct ovs_header *ovs_header = genl_info_userhdr(info);
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skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
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if (!skb)
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@ -272,7 +272,7 @@ error:
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static int ovs_meter_cmd_features(struct sk_buff *skb, struct genl_info *info)
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{
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struct ovs_header *ovs_header = info->userhdr;
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struct ovs_header *ovs_header = genl_info_userhdr(info);
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struct ovs_header *ovs_reply_header;
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struct nlattr *nla, *band_nla;
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struct sk_buff *reply;
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@ -409,7 +409,7 @@ static int ovs_meter_cmd_set(struct sk_buff *skb, struct genl_info *info)
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struct dp_meter *meter, *old_meter;
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struct sk_buff *reply;
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struct ovs_header *ovs_reply_header;
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struct ovs_header *ovs_header = info->userhdr;
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struct ovs_header *ovs_header = genl_info_userhdr(info);
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struct dp_meter_table *meter_tbl;
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struct datapath *dp;
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int err;
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@ -482,7 +482,7 @@ exit_free_meter:
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static int ovs_meter_cmd_get(struct sk_buff *skb, struct genl_info *info)
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{
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struct ovs_header *ovs_header = info->userhdr;
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struct ovs_header *ovs_header = genl_info_userhdr(info);
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struct ovs_header *ovs_reply_header;
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struct nlattr **a = info->attrs;
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struct dp_meter *meter;
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@ -535,7 +535,7 @@ exit_unlock:
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static int ovs_meter_cmd_del(struct sk_buff *skb, struct genl_info *info)
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{
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struct ovs_header *ovs_header = info->userhdr;
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struct ovs_header *ovs_header = genl_info_userhdr(info);
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struct ovs_header *ovs_reply_header;
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struct nlattr **a = info->attrs;
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struct dp_meter *old_meter;
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@ -1294,7 +1294,7 @@ static int tipc_nl_compat_recv(struct sk_buff *skb, struct genl_info *info)
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struct tipc_nl_compat_msg msg;
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struct nlmsghdr *req_nlh;
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struct nlmsghdr *rep_nlh;
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struct tipc_genlmsghdr *req_userhdr = info->userhdr;
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struct tipc_genlmsghdr *req_userhdr = genl_info_userhdr(info);
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memset(&msg, 0, sizeof(msg));
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