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[PATCH net-next 11/15] mptcp: pm: add id parameter for get_addr

Matthieu Baerts (NGI0) posted 15 patches 11 months ago
There is a newer version of this series
[PATCH net-next 11/15] mptcp: pm: add id parameter for get_addr
Posted by Matthieu Baerts (NGI0) 11 months ago 
From: Geliang Tang <tanggeliang@kylinos.cn>

The address id is parsed both in mptcp_pm_nl_get_addr() and
mptcp_userspace_pm_get_addr(), this makes the code somewhat repetitive.

So this patch adds a new parameter 'id' for all get_addr() interfaces.
The address id is only parsed in mptcp_pm_nl_get_addr_doit(), then pass
it to both mptcp_pm_nl_get_addr() and mptcp_userspace_pm_get_addr().

Signed-off-by: Geliang Tang <tanggeliang@kylinos.cn>
Reviewed-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
---
 net/mptcp/pm.c           | 20 ++++++++++++++++----
 net/mptcp/pm_netlink.c   | 14 +++-----------
 net/mptcp/pm_userspace.c | 14 +++-----------
 net/mptcp/protocol.h     |  4 ++--
 4 files changed, 24 insertions(+), 28 deletions(-)

diff --git a/net/mptcp/pm.c b/net/mptcp/pm.c
index 526e5bca1fa1bb67acb8532ad8b8b819d2f5151c..caf5bfc3cd1ddeb22799c28dec3d19b30467b169 100644
--- a/net/mptcp/pm.c
+++ b/net/mptcp/pm.c
@@ -434,16 +434,28 @@ bool mptcp_pm_is_backup(struct mptcp_sock *msk, struct sock_common *skc)
 	return mptcp_pm_nl_is_backup(msk, &skc_local);
 }
 
-static int mptcp_pm_get_addr(struct genl_info *info)
+static int mptcp_pm_get_addr(u8 id, struct genl_info *info)
 {
 	if (info->attrs[MPTCP_PM_ATTR_TOKEN])
-		return mptcp_userspace_pm_get_addr(info);
-	return mptcp_pm_nl_get_addr(info);
+		return mptcp_userspace_pm_get_addr(id, info);
+	return mptcp_pm_nl_get_addr(id, info);
 }
 
 int mptcp_pm_nl_get_addr_doit(struct sk_buff *skb, struct genl_info *info)
 {
-	return mptcp_pm_get_addr(info);
+	struct mptcp_pm_addr_entry addr;
+	struct nlattr *attr;
+	int ret;
+
+	if (GENL_REQ_ATTR_CHECK(info, MPTCP_PM_ENDPOINT_ADDR))
+		return -EINVAL;
+
+	attr = info->attrs[MPTCP_PM_ENDPOINT_ADDR];
+	ret = mptcp_pm_parse_entry(attr, info, false, &addr);
+	if (ret < 0)
+		return ret;
+
+	return mptcp_pm_get_addr(addr.addr.id, info);
 }
 
 static int mptcp_pm_dump_addr(struct sk_buff *msg, struct netlink_callback *cb)
diff --git a/net/mptcp/pm_netlink.c b/net/mptcp/pm_netlink.c
index 853b1ea8680ae753fcb882d8b8f4486519798503..392f91dd21b4ce07efb5f44c701f2261afcdc37e 100644
--- a/net/mptcp/pm_netlink.c
+++ b/net/mptcp/pm_netlink.c
@@ -1773,23 +1773,15 @@ int mptcp_nl_fill_addr(struct sk_buff *skb,
 	return -EMSGSIZE;
 }
 
-int mptcp_pm_nl_get_addr(struct genl_info *info)
+int mptcp_pm_nl_get_addr(u8 id, struct genl_info *info)
 {
 	struct pm_nl_pernet *pernet = genl_info_pm_nl(info);
-	struct mptcp_pm_addr_entry addr, *entry;
+	struct mptcp_pm_addr_entry *entry;
 	struct sk_buff *msg;
 	struct nlattr *attr;
 	void *reply;
 	int ret;
 
-	if (GENL_REQ_ATTR_CHECK(info, MPTCP_PM_ENDPOINT_ADDR))
-		return -EINVAL;
-
-	attr = info->attrs[MPTCP_PM_ENDPOINT_ADDR];
-	ret = mptcp_pm_parse_entry(attr, info, false, &addr);
-	if (ret < 0)
-		return ret;
-
 	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 	if (!msg)
 		return -ENOMEM;
@@ -1803,7 +1795,7 @@ int mptcp_pm_nl_get_addr(struct genl_info *info)
 	}
 
 	rcu_read_lock();
-	entry = __lookup_addr_by_id(pernet, addr.addr.id);
+	entry = __lookup_addr_by_id(pernet, id);
 	if (!entry) {
 		NL_SET_ERR_MSG_ATTR(info->extack, attr, "address not found");
 		ret = -EINVAL;
diff --git a/net/mptcp/pm_userspace.c b/net/mptcp/pm_userspace.c
index 1246063598c8152eb908586dc2e3bcacaaba0a91..79e2d12e088805ff3f59ecf41f5092df9823c1b4 100644
--- a/net/mptcp/pm_userspace.c
+++ b/net/mptcp/pm_userspace.c
@@ -684,9 +684,9 @@ int mptcp_userspace_pm_dump_addr(struct sk_buff *msg,
 	return ret;
 }
 
-int mptcp_userspace_pm_get_addr(struct genl_info *info)
+int mptcp_userspace_pm_get_addr(u8 id, struct genl_info *info)
 {
-	struct mptcp_pm_addr_entry addr, *entry;
+	struct mptcp_pm_addr_entry *entry;
 	struct mptcp_sock *msk;
 	struct sk_buff *msg;
 	struct nlattr *attr;
@@ -694,20 +694,12 @@ int mptcp_userspace_pm_get_addr(struct genl_info *info)
 	struct sock *sk;
 	void *reply;
 
-	if (GENL_REQ_ATTR_CHECK(info, MPTCP_PM_ENDPOINT_ADDR))
-		return ret;
-
 	msk = mptcp_userspace_pm_get_sock(info);
 	if (!msk)
 		return ret;
 
 	sk = (struct sock *)msk;
 
-	attr = info->attrs[MPTCP_PM_ENDPOINT_ADDR];
-	ret = mptcp_pm_parse_entry(attr, info, false, &addr);
-	if (ret < 0)
-		goto out;
-
 	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 	if (!msg) {
 		ret = -ENOMEM;
@@ -724,7 +716,7 @@ int mptcp_userspace_pm_get_addr(struct genl_info *info)
 
 	lock_sock(sk);
 	spin_lock_bh(&msk->pm.lock);
-	entry = mptcp_userspace_pm_lookup_addr_by_id(msk, addr.addr.id);
+	entry = mptcp_userspace_pm_lookup_addr_by_id(msk, id);
 	if (!entry) {
 		NL_SET_ERR_MSG_ATTR(info->extack, attr, "address not found");
 		ret = -EINVAL;
diff --git a/net/mptcp/protocol.h b/net/mptcp/protocol.h
index 69f3909bef8fd163e701f27a003378cdea453805..f209b40d08f372528b2294f3494ccf2d6bbb43e1 100644
--- a/net/mptcp/protocol.h
+++ b/net/mptcp/protocol.h
@@ -1127,8 +1127,8 @@ int mptcp_pm_nl_dump_addr(struct sk_buff *msg,
 			  struct netlink_callback *cb);
 int mptcp_userspace_pm_dump_addr(struct sk_buff *msg,
 				 struct netlink_callback *cb);
-int mptcp_pm_nl_get_addr(struct genl_info *info);
-int mptcp_userspace_pm_get_addr(struct genl_info *info);
+int mptcp_pm_nl_get_addr(u8 id, struct genl_info *info);
+int mptcp_userspace_pm_get_addr(u8 id, struct genl_info *info);
 
 static inline u8 subflow_get_local_id(const struct mptcp_subflow_context *subflow)
 {

-- 
2.47.1
Re: [PATCH net-next 11/15] mptcp: pm: add id parameter for get_addr
Posted by Simon Horman 11 months ago 
On Thu, Jan 16, 2025 at 05:51:33PM +0100, Matthieu Baerts (NGI0) wrote:
> From: Geliang Tang <tanggeliang@kylinos.cn>
> 
> The address id is parsed both in mptcp_pm_nl_get_addr() and
> mptcp_userspace_pm_get_addr(), this makes the code somewhat repetitive.
> 
> So this patch adds a new parameter 'id' for all get_addr() interfaces.
> The address id is only parsed in mptcp_pm_nl_get_addr_doit(), then pass
> it to both mptcp_pm_nl_get_addr() and mptcp_userspace_pm_get_addr().
> 
> Signed-off-by: Geliang Tang <tanggeliang@kylinos.cn>
> Reviewed-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
> Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>

...

> diff --git a/net/mptcp/pm_netlink.c b/net/mptcp/pm_netlink.c
> index 853b1ea8680ae753fcb882d8b8f4486519798503..392f91dd21b4ce07efb5f44c701f2261afcdc37e 100644
> --- a/net/mptcp/pm_netlink.c
> +++ b/net/mptcp/pm_netlink.c
> @@ -1773,23 +1773,15 @@ int mptcp_nl_fill_addr(struct sk_buff *skb,
>  	return -EMSGSIZE;
>  }
>  
> -int mptcp_pm_nl_get_addr(struct genl_info *info)
> +int mptcp_pm_nl_get_addr(u8 id, struct genl_info *info)
>  {
>  	struct pm_nl_pernet *pernet = genl_info_pm_nl(info);
> -	struct mptcp_pm_addr_entry addr, *entry;
> +	struct mptcp_pm_addr_entry *entry;
>  	struct sk_buff *msg;
>  	struct nlattr *attr;
>  	void *reply;
>  	int ret;
>  
> -	if (GENL_REQ_ATTR_CHECK(info, MPTCP_PM_ENDPOINT_ADDR))
> -		return -EINVAL;
> -
> -	attr = info->attrs[MPTCP_PM_ENDPOINT_ADDR];
> -	ret = mptcp_pm_parse_entry(attr, info, false, &addr);
> -	if (ret < 0)
> -		return ret;
> -

Hi Matthieu and Geliang,

This hunk removes the initialisation of attr...

>  	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
>  	if (!msg)
>  		return -ENOMEM;
> @@ -1803,7 +1795,7 @@ int mptcp_pm_nl_get_addr(struct genl_info *info)
>  	}
>  
>  	rcu_read_lock();
> -	entry = __lookup_addr_by_id(pernet, addr.addr.id);
> +	entry = __lookup_addr_by_id(pernet, id);
>  	if (!entry) {
>  		NL_SET_ERR_MSG_ATTR(info->extack, attr, "address not found");

... but attr is still used here.

Flagged by clang-19 W=1 builds and Smatch.

>  		ret = -EINVAL;

...
Re: [PATCH net-next 11/15] mptcp: pm: add id parameter for get_addr
Posted by Matthieu Baerts 11 months ago 
Hi Simon,

On 17/01/2025 11:43, Simon Horman wrote:
> On Thu, Jan 16, 2025 at 05:51:33PM +0100, Matthieu Baerts (NGI0) wrote:
>> From: Geliang Tang <tanggeliang@kylinos.cn>
>>
>> The address id is parsed both in mptcp_pm_nl_get_addr() and
>> mptcp_userspace_pm_get_addr(), this makes the code somewhat repetitive.
>>
>> So this patch adds a new parameter 'id' for all get_addr() interfaces.
>> The address id is only parsed in mptcp_pm_nl_get_addr_doit(), then pass
>> it to both mptcp_pm_nl_get_addr() and mptcp_userspace_pm_get_addr().
>>
>> Signed-off-by: Geliang Tang <tanggeliang@kylinos.cn>
>> Reviewed-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
>> Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
> 
> ...
> 
>> diff --git a/net/mptcp/pm_netlink.c b/net/mptcp/pm_netlink.c
>> index 853b1ea8680ae753fcb882d8b8f4486519798503..392f91dd21b4ce07efb5f44c701f2261afcdc37e 100644
>> --- a/net/mptcp/pm_netlink.c
>> +++ b/net/mptcp/pm_netlink.c
>> @@ -1773,23 +1773,15 @@ int mptcp_nl_fill_addr(struct sk_buff *skb,
>>  	return -EMSGSIZE;
>>  }
>>  
>> -int mptcp_pm_nl_get_addr(struct genl_info *info)
>> +int mptcp_pm_nl_get_addr(u8 id, struct genl_info *info)
>>  {
>>  	struct pm_nl_pernet *pernet = genl_info_pm_nl(info);
>> -	struct mptcp_pm_addr_entry addr, *entry;
>> +	struct mptcp_pm_addr_entry *entry;
>>  	struct sk_buff *msg;
>>  	struct nlattr *attr;
>>  	void *reply;
>>  	int ret;
>>  
>> -	if (GENL_REQ_ATTR_CHECK(info, MPTCP_PM_ENDPOINT_ADDR))
>> -		return -EINVAL;
>> -
>> -	attr = info->attrs[MPTCP_PM_ENDPOINT_ADDR];
>> -	ret = mptcp_pm_parse_entry(attr, info, false, &addr);
>> -	if (ret < 0)
>> -		return ret;
>> -
> 
> Hi Matthieu and Geliang,
> 
> This hunk removes the initialisation of attr...
> 
>>  	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
>>  	if (!msg)
>>  		return -ENOMEM;
>> @@ -1803,7 +1795,7 @@ int mptcp_pm_nl_get_addr(struct genl_info *info)
>>  	}
>>  
>>  	rcu_read_lock();
>> -	entry = __lookup_addr_by_id(pernet, addr.addr.id);
>> +	entry = __lookup_addr_by_id(pernet, id);
>>  	if (!entry) {
>>  		NL_SET_ERR_MSG_ATTR(info->extack, attr, "address not found");
> 
> ... but attr is still used here.
> 
> Flagged by clang-19 W=1 builds and Smatch.

Thank you for having looked at that!

Indeed, I missed that when rebasing and fixing conflicts, my bad, sorry.

This part of the code is moved in the patch to pm.c, where 'attr' is
initialised properly. What's a shame is that, just before sending the
series, I thought about squashing this patch with the next one :)

Anyway, I will fix that in a v2.

I hope that's OK if I add an extra patch in the same series or in parallel.

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

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