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Date: Tue, 11 Apr 2017 09:08:11 +0200
From: Jiri Pirko <jiri@...nulli.us>
To: Johannes Berg <johannes@...solutions.net>
Cc: linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
pablo@...filter.org, Jamal Hadi Salim <jhs@...atatu.com>,
Jiri Benc <jbenc@...hat.com>,
David Ahern <dsa@...ulusnetworks.com>,
Johannes Berg <johannes.berg@...el.com>
Subject: Re: [PATCH net-next v4 1/5] netlink: extended ACK reporting
Tue, Apr 11, 2017 at 08:56:56AM CEST, johannes@...solutions.net wrote:
>From: Johannes Berg <johannes.berg@...el.com>
>
>Add the base infrastructure and UAPI for netlink
>extended ACK reporting. All "manual" calls to
>netlink_ack() pass NULL for now and thus don't
>get extended ACK reporting.
Johannes, I asked already why you are not using 80 cols. This
narrow descriptions look odd.
>
>Big thanks goes to Pablo Neira Ayuso for not only
>bringing up the whole topic at netconf (again) but
>also coming up with the nlattr passing trick and
>various other ideads.
>
>Signed-off-by: Johannes Berg <johannes.berg@...el.com>
>---
> crypto/crypto_user.c | 3 +-
> drivers/infiniband/core/netlink.c | 5 +--
> drivers/scsi/scsi_netlink.c | 2 +-
> include/linux/netlink.h | 26 +++++++++++++-
> include/net/netlink.h | 3 +-
> include/uapi/linux/netlink.h | 32 ++++++++++++++++++
> kernel/audit.c | 2 +-
> net/core/rtnetlink.c | 3 +-
> net/core/sock_diag.c | 3 +-
> net/decnet/netfilter/dn_rtmsg.c | 2 +-
> net/hsr/hsr_netlink.c | 4 +--
> net/netfilter/ipset/ip_set_core.c | 2 +-
> net/netfilter/nfnetlink.c | 22 ++++++------
> net/netlink/af_netlink.c | 71 ++++++++++++++++++++++++++++++++++-----
> net/netlink/af_netlink.h | 1 +
> net/netlink/genetlink.c | 3 +-
> net/xfrm/xfrm_user.c | 3 +-
> 17 files changed, 153 insertions(+), 34 deletions(-)
>
>diff --git a/crypto/crypto_user.c b/crypto/crypto_user.c
>index a90404a0c5ff..4a44830741c1 100644
>--- a/crypto/crypto_user.c
>+++ b/crypto/crypto_user.c
>@@ -483,7 +483,8 @@ static const struct crypto_link {
> [CRYPTO_MSG_DELRNG - CRYPTO_MSG_BASE] = { .doit = crypto_del_rng },
> };
>
>-static int crypto_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
>+static int crypto_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
>+ struct netlink_ext_ack *extack)
> {
> struct nlattr *attrs[CRYPTOCFGA_MAX+1];
> const struct crypto_link *link;
>diff --git a/drivers/infiniband/core/netlink.c b/drivers/infiniband/core/netlink.c
>index 10469b0088b5..b784055423c8 100644
>--- a/drivers/infiniband/core/netlink.c
>+++ b/drivers/infiniband/core/netlink.c
>@@ -146,7 +146,8 @@ int ibnl_put_attr(struct sk_buff *skb, struct nlmsghdr *nlh,
> }
> EXPORT_SYMBOL(ibnl_put_attr);
>
>-static int ibnl_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
>+static int ibnl_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
>+ struct netlink_ext_ack *extack)
> {
> struct ibnl_client *client;
> int type = nlh->nlmsg_type;
>@@ -209,7 +210,7 @@ static void ibnl_rcv_reply_skb(struct sk_buff *skb)
> if (nlh->nlmsg_flags & NLM_F_REQUEST)
> return;
>
>- ibnl_rcv_msg(skb, nlh);
>+ ibnl_rcv_msg(skb, nlh, NULL);
>
> msglen = NLMSG_ALIGN(nlh->nlmsg_len);
> if (msglen > skb->len)
>diff --git a/drivers/scsi/scsi_netlink.c b/drivers/scsi/scsi_netlink.c
>index 109802f776ed..50e624fb8307 100644
>--- a/drivers/scsi/scsi_netlink.c
>+++ b/drivers/scsi/scsi_netlink.c
>@@ -111,7 +111,7 @@ scsi_nl_rcv_msg(struct sk_buff *skb)
>
> next_msg:
> if ((err) || (nlh->nlmsg_flags & NLM_F_ACK))
>- netlink_ack(skb, nlh, err);
>+ netlink_ack(skb, nlh, err, NULL);
>
> skb_pull(skb, rlen);
> }
>diff --git a/include/linux/netlink.h b/include/linux/netlink.h
>index da14ab61f363..60e7137f840d 100644
>--- a/include/linux/netlink.h
>+++ b/include/linux/netlink.h
>@@ -62,11 +62,35 @@ netlink_kernel_create(struct net *net, int unit, struct netlink_kernel_cfg *cfg)
> return __netlink_kernel_create(net, unit, THIS_MODULE, cfg);
> }
>
>+/**
>+ * struct netlink_ext_ack - netlink extended ACK report struct
>+ * @_msg: message string to report - don't access directly, use
>+ * %NL_SET_ERR_MSG
>+ * @bad_attr: attribute with error
>+ */
>+struct netlink_ext_ack {
>+ const char *_msg;
>+ const struct nlattr *bad_attr;
>+};
>+
>+/* Always use this macro, this allows later putting the
>+ * message into a separate section or such for things
>+ * like translation or listing all possible messages.
>+ * Currently string formatting is not supported (due
>+ * to the lack of an output buffer.)
>+ */
>+#define NL_SET_ERR_MSG(extack, msg) do { \
>+ static const char _msg[] = (msg); \
>+ \
>+ (extack)->_msg = _msg; \
>+} while (0)
>+
> extern void netlink_kernel_release(struct sock *sk);
> extern int __netlink_change_ngroups(struct sock *sk, unsigned int groups);
> extern int netlink_change_ngroups(struct sock *sk, unsigned int groups);
> extern void __netlink_clear_multicast_users(struct sock *sk, unsigned int group);
>-extern void netlink_ack(struct sk_buff *in_skb, struct nlmsghdr *nlh, int err);
>+extern void netlink_ack(struct sk_buff *in_skb, struct nlmsghdr *nlh, int err,
>+ const struct netlink_ext_ack *extack);
> extern int netlink_has_listeners(struct sock *sk, unsigned int group);
>
> extern int netlink_unicast(struct sock *ssk, struct sk_buff *skb, __u32 portid, int nonblock);
>diff --git a/include/net/netlink.h b/include/net/netlink.h
>index b239fcd33d80..a064ec3e2ee1 100644
>--- a/include/net/netlink.h
>+++ b/include/net/netlink.h
>@@ -233,7 +233,8 @@ struct nl_info {
> };
>
> int netlink_rcv_skb(struct sk_buff *skb,
>- int (*cb)(struct sk_buff *, struct nlmsghdr *));
>+ int (*cb)(struct sk_buff *, struct nlmsghdr *,
>+ struct netlink_ext_ack *));
> int nlmsg_notify(struct sock *sk, struct sk_buff *skb, u32 portid,
> unsigned int group, int report, gfp_t flags);
>
>diff --git a/include/uapi/linux/netlink.h b/include/uapi/linux/netlink.h
>index b2c9c26ea30f..96e613db68cb 100644
>--- a/include/uapi/linux/netlink.h
>+++ b/include/uapi/linux/netlink.h
>@@ -69,6 +69,10 @@ struct nlmsghdr {
> #define NLM_F_CREATE 0x400 /* Create, if it does not exist */
> #define NLM_F_APPEND 0x800 /* Add to end of list */
>
>+/* Flags for ACK message */
>+#define NLM_F_CAPPED 0x100 /* request was capped */
>+#define NLM_F_ACK_TLVS 0x200 /* extended ACK TVLs were included */
>+
> /*
> 4.4BSD ADD NLM_F_CREATE|NLM_F_EXCL
> 4.4BSD CHANGE NLM_F_REPLACE
>@@ -101,6 +105,33 @@ struct nlmsghdr {
> struct nlmsgerr {
> int error;
> struct nlmsghdr msg;
>+ /*
>+ * followed by the message contents unless NETLINK_CAP_ACK was set
>+ * or the ACK indicates success (error == 0)
>+ * message length is aligned with NLMSG_ALIGN()
>+ */
>+ /*
>+ * followed by TLVs defined in enum nlmsgerr_attrs
>+ * if NETLINK_EXT_ACK was set
>+ */
>+};
>+
>+/**
>+ * enum nlmsgerr_attrs - nlmsgerr attributes
>+ * @NLMSGERR_ATTR_UNUSED: unused
>+ * @NLMSGERR_ATTR_MSG: error message string (string)
>+ * @NLMSGERR_ATTR_OFFS: offset of the invalid attribute in the original
>+ * message, counting from the beginning of the header (u32)
>+ * @NUM_NLMSGERR_ATTRS: number of attributes
>+ * @NLMSGERR_ATTR_MAX: highest attribute number
>+ */
>+enum nlmsgerr_attrs {
>+ NLMSGERR_ATTR_UNUSED,
>+ NLMSGERR_ATTR_MSG,
>+ NLMSGERR_ATTR_OFFS,
>+
>+ NUM_NLMSGERR_ATTRS,
>+ NLMSGERR_ATTR_MAX = NUM_NLMSGERR_ATTRS - 1
> };
>
> #define NETLINK_ADD_MEMBERSHIP 1
>@@ -115,6 +146,7 @@ struct nlmsgerr {
> #define NETLINK_LISTEN_ALL_NSID 8
> #define NETLINK_LIST_MEMBERSHIPS 9
> #define NETLINK_CAP_ACK 10
>+#define NETLINK_EXT_ACK 11
>
> struct nl_pktinfo {
> __u32 group;
>diff --git a/kernel/audit.c b/kernel/audit.c
>index 2f4964cfde0b..d54bf5932374 100644
>--- a/kernel/audit.c
>+++ b/kernel/audit.c
>@@ -1402,7 +1402,7 @@ static void audit_receive_skb(struct sk_buff *skb)
> err = audit_receive_msg(skb, nlh);
> /* if err or if this message says it wants a response */
> if (err || (nlh->nlmsg_flags & NLM_F_ACK))
>- netlink_ack(skb, nlh, err);
>+ netlink_ack(skb, nlh, err, NULL);
>
> nlh = nlmsg_next(nlh, &len);
> }
>diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
>index 58419da7961b..09a2e86f7b92 100644
>--- a/net/core/rtnetlink.c
>+++ b/net/core/rtnetlink.c
>@@ -4046,7 +4046,8 @@ static int rtnl_stats_dump(struct sk_buff *skb, struct netlink_callback *cb)
>
> /* Process one rtnetlink message. */
>
>-static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
>+static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
>+ struct netlink_ext_ack *extack)
> {
> struct net *net = sock_net(skb->sk);
> rtnl_doit_func doit;
>diff --git a/net/core/sock_diag.c b/net/core/sock_diag.c
>index fb9d0e2fd148..217f4e3b82f6 100644
>--- a/net/core/sock_diag.c
>+++ b/net/core/sock_diag.c
>@@ -238,7 +238,8 @@ static int __sock_diag_cmd(struct sk_buff *skb, struct nlmsghdr *nlh)
> return err;
> }
>
>-static int sock_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
>+static int sock_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
>+ struct netlink_ext_ack *extack)
> {
> int ret;
>
>diff --git a/net/decnet/netfilter/dn_rtmsg.c b/net/decnet/netfilter/dn_rtmsg.c
>index 85f2fdc360c2..c8bf5136a72b 100644
>--- a/net/decnet/netfilter/dn_rtmsg.c
>+++ b/net/decnet/netfilter/dn_rtmsg.c
>@@ -96,7 +96,7 @@ static unsigned int dnrmg_hook(void *priv,
> }
>
>
>-#define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0)
>+#define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err), NULL); return; } while (0)
>
> static inline void dnrmg_receive_user_skb(struct sk_buff *skb)
> {
>diff --git a/net/hsr/hsr_netlink.c b/net/hsr/hsr_netlink.c
>index 1ab30e7d3f99..81dac16933fc 100644
>--- a/net/hsr/hsr_netlink.c
>+++ b/net/hsr/hsr_netlink.c
>@@ -350,7 +350,7 @@ static int hsr_get_node_status(struct sk_buff *skb_in, struct genl_info *info)
> return 0;
>
> invalid:
>- netlink_ack(skb_in, nlmsg_hdr(skb_in), -EINVAL);
>+ netlink_ack(skb_in, nlmsg_hdr(skb_in), -EINVAL, NULL);
> return 0;
>
> nla_put_failure:
>@@ -432,7 +432,7 @@ static int hsr_get_node_list(struct sk_buff *skb_in, struct genl_info *info)
> return 0;
>
> invalid:
>- netlink_ack(skb_in, nlmsg_hdr(skb_in), -EINVAL);
>+ netlink_ack(skb_in, nlmsg_hdr(skb_in), -EINVAL, NULL);
> return 0;
>
> nla_put_failure:
>diff --git a/net/netfilter/ipset/ip_set_core.c b/net/netfilter/ipset/ip_set_core.c
>index c296f9b606d4..26356bf8cebf 100644
>--- a/net/netfilter/ipset/ip_set_core.c
>+++ b/net/netfilter/ipset/ip_set_core.c
>@@ -1305,7 +1305,7 @@ ip_set_dump_start(struct sk_buff *skb, struct netlink_callback *cb)
> * manually :-(
> */
> if (nlh->nlmsg_flags & NLM_F_ACK)
>- netlink_ack(cb->skb, nlh, ret);
>+ netlink_ack(cb->skb, nlh, ret, NULL);
> return ret;
> }
> }
>diff --git a/net/netfilter/nfnetlink.c b/net/netfilter/nfnetlink.c
>index 68eda920160e..181d3bb800e6 100644
>--- a/net/netfilter/nfnetlink.c
>+++ b/net/netfilter/nfnetlink.c
>@@ -148,7 +148,8 @@ int nfnetlink_unicast(struct sk_buff *skb, struct net *net, u32 portid,
> EXPORT_SYMBOL_GPL(nfnetlink_unicast);
>
> /* Process one complete nfnetlink message. */
>-static int nfnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
>+static int nfnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
>+ struct netlink_ext_ack *extack)
> {
> struct net *net = sock_net(skb->sk);
> const struct nfnl_callback *nc;
>@@ -261,7 +262,7 @@ static void nfnl_err_deliver(struct list_head *err_list, struct sk_buff *skb)
> struct nfnl_err *nfnl_err, *next;
>
> list_for_each_entry_safe(nfnl_err, next, err_list, head) {
>- netlink_ack(skb, nfnl_err->nlh, nfnl_err->err);
>+ netlink_ack(skb, nfnl_err->nlh, nfnl_err->err, NULL);
> nfnl_err_del(nfnl_err);
> }
> }
>@@ -284,13 +285,13 @@ static void nfnetlink_rcv_batch(struct sk_buff *skb, struct nlmsghdr *nlh,
> int err;
>
> if (subsys_id >= NFNL_SUBSYS_COUNT)
>- return netlink_ack(skb, nlh, -EINVAL);
>+ return netlink_ack(skb, nlh, -EINVAL, NULL);
> replay:
> status = 0;
>
> skb = netlink_skb_clone(oskb, GFP_KERNEL);
> if (!skb)
>- return netlink_ack(oskb, nlh, -ENOMEM);
>+ return netlink_ack(oskb, nlh, -ENOMEM, NULL);
>
> nfnl_lock(subsys_id);
> ss = nfnl_dereference_protected(subsys_id);
>@@ -304,20 +305,20 @@ static void nfnetlink_rcv_batch(struct sk_buff *skb, struct nlmsghdr *nlh,
> #endif
> {
> nfnl_unlock(subsys_id);
>- netlink_ack(oskb, nlh, -EOPNOTSUPP);
>+ netlink_ack(oskb, nlh, -EOPNOTSUPP, NULL);
> return kfree_skb(skb);
> }
> }
>
> if (!ss->commit || !ss->abort) {
> nfnl_unlock(subsys_id);
>- netlink_ack(oskb, nlh, -EOPNOTSUPP);
>+ netlink_ack(oskb, nlh, -EOPNOTSUPP, NULL);
> return kfree_skb(skb);
> }
>
> if (genid && ss->valid_genid && !ss->valid_genid(net, genid)) {
> nfnl_unlock(subsys_id);
>- netlink_ack(oskb, nlh, -ERESTART);
>+ netlink_ack(oskb, nlh, -ERESTART, NULL);
> return kfree_skb(skb);
> }
>
>@@ -407,7 +408,8 @@ static void nfnetlink_rcv_batch(struct sk_buff *skb, struct nlmsghdr *nlh,
> * pointing to the batch header.
> */
> nfnl_err_reset(&err_list);
>- netlink_ack(oskb, nlmsg_hdr(oskb), -ENOMEM);
>+ netlink_ack(oskb, nlmsg_hdr(oskb), -ENOMEM,
>+ NULL);
> status |= NFNL_BATCH_FAILURE;
> goto done;
> }
>@@ -467,7 +469,7 @@ static void nfnetlink_rcv_skb_batch(struct sk_buff *skb, struct nlmsghdr *nlh)
>
> err = nla_parse(cda, NFNL_BATCH_MAX, attr, attrlen, nfnl_batch_policy);
> if (err < 0) {
>- netlink_ack(skb, nlh, err);
>+ netlink_ack(skb, nlh, err, NULL);
> return;
> }
> if (cda[NFNL_BATCH_GENID])
>@@ -493,7 +495,7 @@ static void nfnetlink_rcv(struct sk_buff *skb)
> return;
>
> if (!netlink_net_capable(skb, CAP_NET_ADMIN)) {
>- netlink_ack(skb, nlh, -EPERM);
>+ netlink_ack(skb, nlh, -EPERM, NULL);
> return;
> }
>
>diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
>index fc232441cf23..c1564768000e 100644
>--- a/net/netlink/af_netlink.c
>+++ b/net/netlink/af_netlink.c
>@@ -1652,6 +1652,13 @@ static int netlink_setsockopt(struct socket *sock, int level, int optname,
> nlk->flags &= ~NETLINK_F_CAP_ACK;
> err = 0;
> break;
>+ case NETLINK_EXT_ACK:
>+ if (val)
>+ nlk->flags |= NETLINK_F_EXT_ACK;
>+ else
>+ nlk->flags &= ~NETLINK_F_EXT_ACK;
>+ err = 0;
>+ break;
> default:
> err = -ENOPROTOOPT;
> }
>@@ -1736,6 +1743,15 @@ static int netlink_getsockopt(struct socket *sock, int level, int optname,
> return -EFAULT;
> err = 0;
> break;
>+ case NETLINK_EXT_ACK:
>+ if (len < sizeof(int))
>+ return -EINVAL;
>+ len = sizeof(int);
>+ val = nlk->flags & NETLINK_F_EXT_ACK ? 1 : 0;
>+ if (put_user(len, optlen) || put_user(val, optval))
>+ return -EFAULT;
>+ err = 0;
>+ break;
> default:
> err = -ENOPROTOOPT;
> }
>@@ -2267,21 +2283,40 @@ int __netlink_dump_start(struct sock *ssk, struct sk_buff *skb,
> }
> EXPORT_SYMBOL(__netlink_dump_start);
>
>-void netlink_ack(struct sk_buff *in_skb, struct nlmsghdr *nlh, int err)
>+void netlink_ack(struct sk_buff *in_skb, struct nlmsghdr *nlh, int err,
>+ const struct netlink_ext_ack *extack)
> {
> struct sk_buff *skb;
> struct nlmsghdr *rep;
> struct nlmsgerr *errmsg;
> size_t payload = sizeof(*errmsg);
>+ size_t tlvlen = 0;
> struct netlink_sock *nlk = nlk_sk(NETLINK_CB(in_skb).sk);
>+ unsigned int flags = 0;
>
> /* Error messages get the original request appened, unless the user
>- * requests to cap the error message.
>+ * requests to cap the error message, and get extra error data if
>+ * requested.
> */
>- if (!(nlk->flags & NETLINK_F_CAP_ACK) && err)
>- payload += nlmsg_len(nlh);
>+ if (err) {
>+ if (!(nlk->flags & NETLINK_F_CAP_ACK))
>+ payload += nlmsg_len(nlh);
>+ else
>+ flags |= NLM_F_CAPPED;
>+ if (nlk->flags & NETLINK_F_EXT_ACK && extack) {
>+ if (extack->_msg)
>+ tlvlen += nla_total_size(strlen(extack->_msg) + 1);
>+ if (extack->bad_attr)
>+ tlvlen += nla_total_size(sizeof(u32));
>+ }
>+ } else {
>+ flags |= NLM_F_CAPPED;
>+ }
>
>- skb = nlmsg_new(payload, GFP_KERNEL);
>+ if (tlvlen)
>+ flags |= NLM_F_ACK_TLVS;
>+
>+ skb = nlmsg_new(payload + tlvlen, GFP_KERNEL);
> if (!skb) {
> struct sock *sk;
>
>@@ -2297,17 +2332,35 @@ void netlink_ack(struct sk_buff *in_skb, struct nlmsghdr *nlh, int err)
> }
>
> rep = __nlmsg_put(skb, NETLINK_CB(in_skb).portid, nlh->nlmsg_seq,
>- NLMSG_ERROR, payload, 0);
>+ NLMSG_ERROR, payload, flags);
> errmsg = nlmsg_data(rep);
> errmsg->error = err;
> memcpy(&errmsg->msg, nlh, payload > sizeof(*errmsg) ? nlh->nlmsg_len : sizeof(*nlh));
>+
>+ if (err && nlk->flags & NETLINK_F_EXT_ACK && extack) {
>+ if (extack->_msg)
>+ WARN_ON(nla_put_string(skb, NLMSGERR_ATTR_MSG,
>+ extack->_msg));
>+ if (extack->bad_attr &&
>+ !WARN_ON((u8 *)extack->bad_attr < in_skb->data ||
>+ (u8 *)extack->bad_attr >= in_skb->data +
>+ in_skb->len))
>+ WARN_ON(nla_put_u32(skb, NLMSGERR_ATTR_OFFS,
>+ (u8 *)extack->bad_attr -
>+ in_skb->data));
>+ }
>+
>+ nlmsg_end(skb, rep);
>+
> netlink_unicast(in_skb->sk, skb, NETLINK_CB(in_skb).portid, MSG_DONTWAIT);
> }
> EXPORT_SYMBOL(netlink_ack);
>
> int netlink_rcv_skb(struct sk_buff *skb, int (*cb)(struct sk_buff *,
>- struct nlmsghdr *))
>+ struct nlmsghdr *,
>+ struct netlink_ext_ack *))
> {
>+ struct netlink_ext_ack extack = {};
> struct nlmsghdr *nlh;
> int err;
>
>@@ -2328,13 +2381,13 @@ int netlink_rcv_skb(struct sk_buff *skb, int (*cb)(struct sk_buff *,
> if (nlh->nlmsg_type < NLMSG_MIN_TYPE)
> goto ack;
>
>- err = cb(skb, nlh);
>+ err = cb(skb, nlh, &extack);
> if (err == -EINTR)
> goto skip;
>
> ack:
> if (nlh->nlmsg_flags & NLM_F_ACK || err)
>- netlink_ack(skb, nlh, err);
>+ netlink_ack(skb, nlh, err, &extack);
>
> skip:
> msglen = NLMSG_ALIGN(nlh->nlmsg_len);
>diff --git a/net/netlink/af_netlink.h b/net/netlink/af_netlink.h
>index f792f8d7f982..3490f2430532 100644
>--- a/net/netlink/af_netlink.h
>+++ b/net/netlink/af_netlink.h
>@@ -13,6 +13,7 @@
> #define NETLINK_F_RECV_NO_ENOBUFS 0x8
> #define NETLINK_F_LISTEN_ALL_NSID 0x10
> #define NETLINK_F_CAP_ACK 0x20
>+#define NETLINK_F_EXT_ACK 0x40
>
> #define NLGRPSZ(x) (ALIGN(x, sizeof(unsigned long) * 8) / 8)
> #define NLGRPLONGS(x) (NLGRPSZ(x)/sizeof(unsigned long))
>diff --git a/net/netlink/genetlink.c b/net/netlink/genetlink.c
>index 92e0981f7404..57b2e3648bc0 100644
>--- a/net/netlink/genetlink.c
>+++ b/net/netlink/genetlink.c
>@@ -605,7 +605,8 @@ static int genl_family_rcv_msg(const struct genl_family *family,
> return err;
> }
>
>-static int genl_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
>+static int genl_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
>+ struct netlink_ext_ack *extack)
> {
> const struct genl_family *family;
> int err;
>diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c
>index 40a8aa39220d..1ba8c115a993 100644
>--- a/net/xfrm/xfrm_user.c
>+++ b/net/xfrm/xfrm_user.c
>@@ -2448,7 +2448,8 @@ static const struct xfrm_link {
> [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo },
> };
>
>-static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
>+static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
>+ struct netlink_ext_ack *extack)
> {
> struct net *net = sock_net(skb->sk);
> struct nlattr *attrs[XFRMA_MAX+1];
>--
>2.11.0
>
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