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net: genetlink: introduce dump info struct to be available during dumpit op 

Currently the cb->data is taken by ops during non-parallel dumping.
Introduce a new structure genl_dumpit_info and store the ops there.
Distribute the info to both non-parallel and parallel dumping. Also add
a helper genl_dumpit_info() to easily get the info structure in the
dumpit callback from cb.

Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jiri Pirko 2019-10-05 20:04:34 +02:00 committed by David S. Miller
parent be064defab
commit 1927f41a22
2 changed files with 52 additions and 9 deletions
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14
include/net/genetlink.h
View File

@ -127,6 +127,20 @@ enum genl_validate_flags {
GENL_DONT_VALIDATE_DUMP_STRICT = BIT(2),
};
/**
* struct genl_info - info that is available during dumpit op call
* @ops: generic netlink ops - for internal genl code usage
*/
struct genl_dumpit_info {
const struct genl_ops *ops;
};
static inline const struct genl_dumpit_info *
genl_dumpit_info(struct netlink_callback *cb)
{
return cb->data;
}
/**
* struct genl_ops - generic netlink operations
* @cmd: command identifier

47
net/netlink/genetlink.c
View File

@ -458,10 +458,19 @@ void *genlmsg_put(struct sk_buff *skb, u32 portid, u32 seq,
}
EXPORT_SYMBOL(genlmsg_put);
static struct genl_dumpit_info *genl_dumpit_info_alloc(void)
{
return kmalloc(sizeof(struct genl_dumpit_info), GFP_KERNEL);
}
static void genl_dumpit_info_free(const struct genl_dumpit_info *info)
{
kfree(info);
}
static int genl_lock_start(struct netlink_callback *cb)
{
/* our ops are always const - netlink API doesn't propagate that */
const struct genl_ops *ops = cb->data;
const struct genl_ops *ops = genl_dumpit_info(cb)->ops;
int rc = 0;
if (ops->start) {
@ -474,8 +483,7 @@ static int genl_lock_start(struct netlink_callback *cb)
static int genl_lock_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
{
/* our ops are always const - netlink API doesn't propagate that */
const struct genl_ops *ops = cb->data;
const struct genl_ops *ops = genl_dumpit_info(cb)->ops;
int rc;
genl_lock();
@ -486,8 +494,8 @@ static int genl_lock_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
static int genl_lock_done(struct netlink_callback *cb)
{
/* our ops are always const - netlink API doesn't propagate that */
const struct genl_ops *ops = cb->data;
const struct genl_dumpit_info *info = genl_dumpit_info(cb);
const struct genl_ops *ops = info->ops;
int rc = 0;
if (ops->done) {
@ -495,6 +503,19 @@ static int genl_lock_done(struct netlink_callback *cb)
rc = ops->done(cb);
genl_unlock();
}
genl_dumpit_info_free(info);
return rc;
}
static int genl_parallel_done(struct netlink_callback *cb)
{
const struct genl_dumpit_info *info = genl_dumpit_info(cb);
const struct genl_ops *ops = info->ops;
int rc = 0;
if (ops->done)
rc = ops->done(cb);
genl_dumpit_info_free(info);
return rc;
}
@ -505,6 +526,7 @@ static int genl_family_rcv_msg_dumpit(const struct genl_family *family,
const struct genl_ops *ops,
int hdrlen, struct net *net)
{
struct genl_dumpit_info *info;
int err;
if (!ops->dumpit)
@ -528,11 +550,17 @@ static int genl_family_rcv_msg_dumpit(const struct genl_family *family,
}
}
/* Allocate dumpit info. It is going to be freed by done() callback. */
info = genl_dumpit_info_alloc();
if (!info)
return -ENOMEM;
info->ops = ops;
if (!family->parallel_ops) {
struct netlink_dump_control c = {
.module = family->module,
/* we have const, but the netlink API doesn't */
.data = (void *)ops,
.data = info,
.start = genl_lock_start,
.dump = genl_lock_dumpit,
.done = genl_lock_done,
@ -545,9 +573,10 @@ static int genl_family_rcv_msg_dumpit(const struct genl_family *family,
} else {
struct netlink_dump_control c = {
.module = family->module,
.data = info,
.start = ops->start,
.dump = ops->dumpit,
.done = ops->done,
.done = genl_parallel_done,
};
err = __netlink_dump_start(net->genl_sock, skb, nlh, &c);