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genetlink: factor skb preparation out of ctrl_dumppolicy()

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We'll need this later for the per-op policy index dump.

Reviewed-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Johannes Berg 2020-10-03 10:44:44 +02:00 committed by David S. Miller
parent 04a351a62b
commit aa85ee5f95
1 changed files with 19 additions and 6 deletions
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25
net/netlink/genetlink.c
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@ -1154,6 +1154,24 @@ static int ctrl_dumppolicy_start(struct netlink_callback *cb)
rt->maxattr);
}
static void *ctrl_dumppolicy_prep(struct sk_buff *skb,
struct netlink_callback *cb)
{
struct ctrl_dump_policy_ctx *ctx = (void *)cb->ctx;
void *hdr;
hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid,
cb->nlh->nlmsg_seq, &genl_ctrl,
NLM_F_MULTI, CTRL_CMD_GETPOLICY);
if (!hdr)
return NULL;
if (nla_put_u16(skb, CTRL_ATTR_FAMILY_ID, ctx->fam_id))
return NULL;
return hdr;
}
static int ctrl_dumppolicy(struct sk_buff *skb, struct netlink_callback *cb)
{
struct ctrl_dump_policy_ctx *ctx = (void *)cb->ctx;
@ -1162,15 +1180,10 @@ static int ctrl_dumppolicy(struct sk_buff *skb, struct netlink_callback *cb)
void *hdr;
struct nlattr *nest;
hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid,
cb->nlh->nlmsg_seq, &genl_ctrl,
NLM_F_MULTI, CTRL_CMD_GETPOLICY);
hdr = ctrl_dumppolicy_prep(skb, cb);
if (!hdr)
goto nla_put_failure;
if (nla_put_u16(skb, CTRL_ATTR_FAMILY_ID, ctx->fam_id))
goto nla_put_failure;
nest = nla_nest_start(skb, CTRL_ATTR_POLICY);
if (!nest)
goto nla_put_failure;