[PATCH RFC net-next 1/5] net/netlink: Pass extack to dump callbacks

[dsahern]

From: David Ahern <dsah...@gmail.com>

Pass extack to dump callbacks by adding extack to netlink_dump_control
and transferring to netlink_callback. Update rtnetlink as the first
user.

Signed-off-by: David Ahern <dsah...@gmail.com>
---
 include/linux/netlink.h  | 2 ++
 net/core/rtnetlink.c     | 1 +
 net/netlink/af_netlink.c | 1 +
 3 files changed, 4 insertions(+)

diff --git a/include/linux/netlink.h b/include/linux/netlink.h
index 71f121b66ca8..8fc90308a653 100644
--- a/include/linux/netlink.h
+++ b/include/linux/netlink.h
@@ -176,6 +176,7 @@ struct netlink_callback {
        void                    *data;
        /* the module that dump function belong to */
        struct module           *module;
+       struct netlink_ext_ack  *extack;
        u16                     family;
        u16                     min_dump_alloc;
        unsigned int            prev_seq, seq;
@@ -197,6 +198,7 @@ struct netlink_dump_control {
        int (*done)(struct netlink_callback *);
        void *data;
        struct module *module;
+       struct netlink_ext_ack *extack;
        u16 min_dump_alloc;
 };
 
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 35162e1b06ad..da91b38297d3 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -4689,6 +4689,7 @@ static int rtnetlink_rcv_msg(struct sk_buff *skb, struct 
nlmsghdr *nlh,
                                .dump           = dumpit,
                                .min_dump_alloc = min_dump_alloc,
                                .module         = owner,
+                               .extack         = extack
                        };
                        err = netlink_dump_start(rtnl, skb, nlh, &c);
                        /* netlink_dump_start() will keep a reference on
diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
index e3a0538ec0be..7d9e735b32c4 100644
--- a/net/netlink/af_netlink.c
+++ b/net/netlink/af_netlink.c
@@ -2307,6 +2307,7 @@ int __netlink_dump_start(struct sock *ssk, struct sk_buff 
*skb,
        cb->module = control->module;
        cb->min_dump_alloc = control->min_dump_alloc;
        cb->skb = skb;
+       cb->extack = control->extack;
 
        if (control->start) {
                ret = control->start(cb);
-- 
2.11.0