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[PATCH mptcp-next v4 7/7] mptcp: add local parameter for set_flags

Geliang Tang posted 7 patches 1 year, 1 month ago
[PATCH mptcp-next v4 7/7] mptcp: add local parameter for set_flags
Posted by Geliang Tang 1 year, 1 month ago 
From: Geliang Tang <tanggeliang@kylinos.cn>

This patch updates the interfaces set_flags to reduce repetitive
code, adds a new parameter 'local' for them. The local address is
parsed in public helper mptcp_pm_nl_set_flags_doit(), then pass
it to mptcp_pm_nl_set_flags() and mptcp_userspace_pm_set_flags().

Signed-off-by: Geliang Tang <tanggeliang@kylinos.cn>
---
 net/mptcp/pm.c           | 16 ++++++++++++++--
 net/mptcp/pm_netlink.c   | 34 ++++++++++++----------------------
 net/mptcp/pm_userspace.c | 22 ++++++++--------------
 net/mptcp/protocol.h     |  6 ++++--
 4 files changed, 38 insertions(+), 40 deletions(-)

diff --git a/net/mptcp/pm.c b/net/mptcp/pm.c
index c213f06bc702..b1f36dc1a091 100644
--- a/net/mptcp/pm.c
+++ b/net/mptcp/pm.c
@@ -506,9 +506,21 @@ int mptcp_pm_nl_get_addr_dumpit(struct sk_buff *msg,
 
 static int mptcp_pm_set_flags(struct genl_info *info)
 {
+	struct mptcp_pm_addr_entry loc = { .addr = { .family = AF_UNSPEC }, };
+	struct nlattr *attr_loc;
+	int ret = -EINVAL;
+
+	if (GENL_REQ_ATTR_CHECK(info, MPTCP_PM_ATTR_ADDR))
+		return ret;
+
+	attr_loc = info->attrs[MPTCP_PM_ATTR_ADDR];
+	ret = mptcp_pm_parse_entry(attr_loc, info, false, &loc);
+	if (ret < 0)
+		return ret;
+
 	if (info->attrs[MPTCP_PM_ATTR_TOKEN])
-		return mptcp_userspace_pm_set_flags(info);
-	return mptcp_pm_nl_set_flags(info);
+		return mptcp_userspace_pm_set_flags(&loc, info);
+	return mptcp_pm_nl_set_flags(&loc, info);
 }
 
 int mptcp_pm_nl_set_flags_doit(struct sk_buff *skb, struct genl_info *info)
diff --git a/net/mptcp/pm_netlink.c b/net/mptcp/pm_netlink.c
index 52fd9830b685..ec6afa5c3525 100644
--- a/net/mptcp/pm_netlink.c
+++ b/net/mptcp/pm_netlink.c
@@ -1951,61 +1951,51 @@ static int mptcp_nl_set_flags(struct net *net,
 	return ret;
 }
 
-int mptcp_pm_nl_set_flags(struct genl_info *info)
+int mptcp_pm_nl_set_flags(struct mptcp_pm_addr_entry *local,
+			  struct genl_info *info)
 {
-	struct mptcp_pm_addr_entry addr = { .addr = { .family = AF_UNSPEC }, };
 	u8 changed, mask = MPTCP_PM_ADDR_FLAG_BACKUP |
 			   MPTCP_PM_ADDR_FLAG_FULLMESH;
 	struct net *net = genl_info_net(info);
 	struct mptcp_pm_addr_entry *entry;
 	struct pm_nl_pernet *pernet;
-	struct nlattr *attr;
 	u8 lookup_by_id = 0;
 	u8 bkup = 0;
-	int ret;
-
-	if (GENL_REQ_ATTR_CHECK(info, MPTCP_PM_ATTR_ADDR))
-		return -EINVAL;
 
 	pernet = pm_nl_get_pernet(net);
 
-	attr = info->attrs[MPTCP_PM_ATTR_ADDR];
-	ret = mptcp_pm_parse_entry(attr, info, false, &addr);
-	if (ret < 0)
-		return ret;
-
-	if (addr.addr.family == AF_UNSPEC) {
+	if (local->addr.family == AF_UNSPEC) {
 		lookup_by_id = 1;
-		if (!addr.addr.id) {
+		if (!local->addr.id) {
 			GENL_SET_ERR_MSG(info, "missing address ID");
 			return -EOPNOTSUPP;
 		}
 	}
 
-	if (addr.flags & MPTCP_PM_ADDR_FLAG_BACKUP)
+	if (local->flags & MPTCP_PM_ADDR_FLAG_BACKUP)
 		bkup = 1;
 
 	spin_lock_bh(&pernet->lock);
-	entry = lookup_by_id ? __lookup_addr_by_id(pernet, addr.addr.id) :
-			       __lookup_addr(pernet, &addr.addr);
+	entry = lookup_by_id ? __lookup_addr_by_id(pernet, local->addr.id) :
+			       __lookup_addr(pernet, &local->addr);
 	if (!entry) {
 		spin_unlock_bh(&pernet->lock);
 		GENL_SET_ERR_MSG(info, "address not found");
 		return -EINVAL;
 	}
-	if ((addr.flags & MPTCP_PM_ADDR_FLAG_FULLMESH) &&
+	if ((local->flags & MPTCP_PM_ADDR_FLAG_FULLMESH) &&
 	    (entry->flags & MPTCP_PM_ADDR_FLAG_SIGNAL)) {
 		spin_unlock_bh(&pernet->lock);
 		GENL_SET_ERR_MSG(info, "invalid addr flags");
 		return -EINVAL;
 	}
 
-	changed = (addr.flags ^ entry->flags) & mask;
-	entry->flags = (entry->flags & ~mask) | (addr.flags & mask);
-	addr = *entry;
+	changed = (local->flags ^ entry->flags) & mask;
+	entry->flags = (entry->flags & ~mask) | (local->flags & mask);
+	*local = *entry;
 	spin_unlock_bh(&pernet->lock);
 
-	mptcp_nl_set_flags(net, &addr.addr, bkup, changed);
+	mptcp_nl_set_flags(net, &local->addr, bkup, changed);
 	return 0;
 }
 
diff --git a/net/mptcp/pm_userspace.c b/net/mptcp/pm_userspace.c
index 4007f67cc7b1..431454578021 100644
--- a/net/mptcp/pm_userspace.c
+++ b/net/mptcp/pm_userspace.c
@@ -564,19 +564,18 @@ int mptcp_pm_nl_subflow_destroy_doit(struct sk_buff *skb, struct genl_info *info
 	return err;
 }
 
-int mptcp_userspace_pm_set_flags(struct genl_info *info)
+int mptcp_userspace_pm_set_flags(struct mptcp_pm_addr_entry *local,
+				 struct genl_info *info)
 {
-	struct mptcp_pm_addr_entry loc = { .addr = { .family = AF_UNSPEC }, };
 	struct mptcp_addr_info rem = { .family = AF_UNSPEC, };
 	struct mptcp_pm_addr_entry *entry;
-	struct nlattr *attr, *attr_rem;
+	struct nlattr *attr_rem;
 	struct mptcp_sock *msk;
 	int ret = -EINVAL;
 	struct sock *sk;
 	u8 bkup = 0;
 
-	if (GENL_REQ_ATTR_CHECK(info, MPTCP_PM_ATTR_ADDR) ||
-	    GENL_REQ_ATTR_CHECK(info, MPTCP_PM_ATTR_ADDR_REMOTE))
+	if (GENL_REQ_ATTR_CHECK(info, MPTCP_PM_ATTR_ADDR_REMOTE))
 		return ret;
 
 	msk = mptcp_userspace_pm_get_sock(info);
@@ -585,12 +584,7 @@ int mptcp_userspace_pm_set_flags(struct genl_info *info)
 
 	sk = (struct sock *)msk;
 
-	attr = info->attrs[MPTCP_PM_ATTR_ADDR];
-	ret = mptcp_pm_parse_entry(attr, info, false, &loc);
-	if (ret < 0)
-		goto set_flags_err;
-
-	if (loc.addr.family == AF_UNSPEC) {
+	if (local->addr.family == AF_UNSPEC) {
 		GENL_SET_ERR_MSG(info, "invalid local address family");
 		ret = -EINVAL;
 		goto set_flags_err;
@@ -608,11 +602,11 @@ int mptcp_userspace_pm_set_flags(struct genl_info *info)
 		goto set_flags_err;
 	}
 
-	if (loc.flags & MPTCP_PM_ADDR_FLAG_BACKUP)
+	if (local->flags & MPTCP_PM_ADDR_FLAG_BACKUP)
 		bkup = 1;
 
 	spin_lock_bh(&msk->pm.lock);
-	entry = mptcp_userspace_pm_lookup_addr(msk, &loc.addr);
+	entry = mptcp_userspace_pm_lookup_addr(msk, &local->addr);
 	if (entry) {
 		if (bkup)
 			entry->flags |= MPTCP_PM_ADDR_FLAG_BACKUP;
@@ -622,7 +616,7 @@ int mptcp_userspace_pm_set_flags(struct genl_info *info)
 	spin_unlock_bh(&msk->pm.lock);
 
 	lock_sock(sk);
-	ret = mptcp_pm_nl_mp_prio_send_ack(msk, &loc.addr, &rem, bkup);
+	ret = mptcp_pm_nl_mp_prio_send_ack(msk, &local->addr, &rem, bkup);
 	release_sock(sk);
 
 	/* mptcp_pm_nl_mp_prio_send_ack() only fails in one case */
diff --git a/net/mptcp/protocol.h b/net/mptcp/protocol.h
index aa014f514af3..9183c0bf8087 100644
--- a/net/mptcp/protocol.h
+++ b/net/mptcp/protocol.h
@@ -1028,8 +1028,10 @@ bool mptcp_lookup_subflow_by_saddr(const struct list_head *list,
 				   const struct mptcp_addr_info *saddr);
 bool mptcp_remove_anno_list_by_saddr(struct mptcp_sock *msk,
 				     const struct mptcp_addr_info *addr);
-int mptcp_pm_nl_set_flags(struct genl_info *info);
-int mptcp_userspace_pm_set_flags(struct genl_info *info);
+int mptcp_pm_nl_set_flags(struct mptcp_pm_addr_entry *local,
+			  struct genl_info *info);
+int mptcp_userspace_pm_set_flags(struct mptcp_pm_addr_entry *local,
+				 struct genl_info *info);
 int mptcp_pm_announce_addr(struct mptcp_sock *msk,
 			   const struct mptcp_addr_info *addr,
 			   bool echo);
-- 
2.45.2
Re: [PATCH mptcp-next v4 7/7] mptcp: add local parameter for set_flags
Posted by Matthieu Baerts 1 year, 1 month ago 
Hi Geliang,

On 10/01/2025 08:36, Geliang Tang wrote:
> From: Geliang Tang <tanggeliang@kylinos.cn>
> 
> This patch updates the interfaces set_flags to reduce repetitive
> code, adds a new parameter 'local' for them. The local address is
> parsed in public helper mptcp_pm_nl_set_flags_doit(), then pass
> it to mptcp_pm_nl_set_flags() and mptcp_userspace_pm_set_flags().

(...)

> diff --git a/net/mptcp/pm_netlink.c b/net/mptcp/pm_netlink.c
> index 52fd9830b685..ec6afa5c3525 100644
> --- a/net/mptcp/pm_netlink.c
> +++ b/net/mptcp/pm_netlink.c
> @@ -1951,61 +1951,51 @@ static int mptcp_nl_set_flags(struct net *net,
>  	return ret;
>  }
>  
> -int mptcp_pm_nl_set_flags(struct genl_info *info)
> +int mptcp_pm_nl_set_flags(struct mptcp_pm_addr_entry *local,
> +			  struct genl_info *info)
>  {
> -	struct mptcp_pm_addr_entry addr = { .addr = { .family = AF_UNSPEC }, };
>  	u8 changed, mask = MPTCP_PM_ADDR_FLAG_BACKUP |
>  			   MPTCP_PM_ADDR_FLAG_FULLMESH;
>  	struct net *net = genl_info_net(info);
>  	struct mptcp_pm_addr_entry *entry;
>  	struct pm_nl_pernet *pernet;
> -	struct nlattr *attr;
>  	u8 lookup_by_id = 0;
>  	u8 bkup = 0;
> -	int ret;
> -
> -	if (GENL_REQ_ATTR_CHECK(info, MPTCP_PM_ATTR_ADDR))
> -		return -EINVAL;
>  
>  	pernet = pm_nl_get_pernet(net);
>  
> -	attr = info->attrs[MPTCP_PM_ATTR_ADDR];

As I mentioned in the "use GENL_REQ_ATTR_CHECK in userspace pm" series,
I think this 'attr' can be kept here -- because we still have access to
'info' -- ...

> -	ret = mptcp_pm_parse_entry(attr, info, false, &addr);
> -	if (ret < 0)
> -		return ret;
> -
> -	if (addr.addr.family == AF_UNSPEC) {
> +	if (local->addr.family == AF_UNSPEC) {
>  		lookup_by_id = 1;
> -		if (!addr.addr.id) {
> +		if (!local->addr.id) {
>  			GENL_SET_ERR_MSG(info, "missing address ID");

... and use NL_SET_ERR_MSG_ATTR() here and below.

That way, the code around the reporting of errors would be uniformed
with the rest, and that could still help userspace devs.

I can do the modifications when applying the patches of the other series
and this one here.

(...)

> diff --git a/net/mptcp/pm_userspace.c b/net/mptcp/pm_userspace.c
> index 4007f67cc7b1..431454578021 100644
> --- a/net/mptcp/pm_userspace.c
> +++ b/net/mptcp/pm_userspace.c
> @@ -564,19 +564,18 @@ int mptcp_pm_nl_subflow_destroy_doit(struct sk_buff *skb, struct genl_info *info
>  	return err;
>  }
>  
> -int mptcp_userspace_pm_set_flags(struct genl_info *info)
> +int mptcp_userspace_pm_set_flags(struct mptcp_pm_addr_entry *local,
> +				 struct genl_info *info)
>  {
> -	struct mptcp_pm_addr_entry loc = { .addr = { .family = AF_UNSPEC }, };
>  	struct mptcp_addr_info rem = { .family = AF_UNSPEC, };
>  	struct mptcp_pm_addr_entry *entry;
> -	struct nlattr *attr, *attr_rem;
> +	struct nlattr *attr_rem;
>  	struct mptcp_sock *msk;
>  	int ret = -EINVAL;
>  	struct sock *sk;
>  	u8 bkup = 0;
>  
> -	if (GENL_REQ_ATTR_CHECK(info, MPTCP_PM_ATTR_ADDR) ||
> -	    GENL_REQ_ATTR_CHECK(info, MPTCP_PM_ATTR_ADDR_REMOTE))
> +	if (GENL_REQ_ATTR_CHECK(info, MPTCP_PM_ATTR_ADDR_REMOTE))
>  		return ret;
>  
>  	msk = mptcp_userspace_pm_get_sock(info);
> @@ -585,12 +584,7 @@ int mptcp_userspace_pm_set_flags(struct genl_info *info)
>  
>  	sk = (struct sock *)msk;
>  
> -	attr = info->attrs[MPTCP_PM_ATTR_ADDR];

Same here.

> -	ret = mptcp_pm_parse_entry(attr, info, false, &loc);
> -	if (ret < 0)
> -		goto set_flags_err;
> -
> -	if (loc.addr.family == AF_UNSPEC) {
> +	if (local->addr.family == AF_UNSPEC) {
>  		GENL_SET_ERR_MSG(info, "invalid local address family");
>  		ret = -EINVAL;
>  		goto set_flags_err;
(...)

Cheers,
Matt
-- 
Sponsored by the NGI0 Core fund.

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