[PATCH] l2tp: generate correct module alias strings

[PATCH] l2tp: generate correct module alias strings

[Andrea Righi]

Commit 65b32f801bfb ("uapi: move IPPROTO_L2TP to in.h") moved the
definition of IPPROTO_L2TP from a define to an enum, but since
__stringify doesn't work properly with enums, we ended up breaking the
modalias strings for the l2tp modules:

 $ modinfo l2tp_ip l2tp_ip6 | grep alias
 alias:          net-pf-2-proto-IPPROTO_L2TP
 alias:          net-pf-2-proto-2-type-IPPROTO_L2TP
 alias:          net-pf-10-proto-IPPROTO_L2TP
 alias:          net-pf-10-proto-2-type-IPPROTO_L2TP

Use the resolved number directly in MODULE_ALIAS_*() macros (as we
already do with SOCK_DGRAM) to fix the alias strings:

$ modinfo l2tp_ip l2tp_ip6 | grep alias
alias:          net-pf-2-proto-115
alias:          net-pf-2-proto-115-type-2
alias:          net-pf-10-proto-115
alias:          net-pf-10-proto-115-type-2

Moreover, fix the ordering of the parameters passed to
MODULE_ALIAS_NET_PF_PROTO_TYPE() by switching proto and type.

Fixes: 65b32f801bfb ("uapi: move IPPROTO_L2TP to in.h")
Link: https://lore.kernel.org/lkml/ZCQt7hmodtUaBlCP@righiandr-XPS-13-7390
Signed-off-by: Guillaume Nault <gnault@redhat.com>
Signed-off-by: Andrea Righi <andrea.righi@canonical.com>
---
 net/l2tp/l2tp_ip.c  | 8 ++++----
 net/l2tp/l2tp_ip6.c | 8 ++++----
 2 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/net/l2tp/l2tp_ip.c b/net/l2tp/l2tp_ip.c
index 4db5a554bdbd..41a74fc84ca1 100644
--- a/net/l2tp/l2tp_ip.c
+++ b/net/l2tp/l2tp_ip.c
@@ -677,8 +677,8 @@ MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
 MODULE_DESCRIPTION("L2TP over IP");
 MODULE_VERSION("1.0");
 
-/* Use the value of SOCK_DGRAM (2) directory, because __stringify doesn't like
- * enums
+/* Use the values of SOCK_DGRAM (2) as type and IPPROTO_L2TP (115) as protocol,
+ * because __stringify doesn't like enums
  */
-MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET, 2, IPPROTO_L2TP);
-MODULE_ALIAS_NET_PF_PROTO(PF_INET, IPPROTO_L2TP);
+MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET, 115, 2);
+MODULE_ALIAS_NET_PF_PROTO(PF_INET, 115);
diff --git a/net/l2tp/l2tp_ip6.c b/net/l2tp/l2tp_ip6.c
index 2478aa60145f..5137ea1861ce 100644
--- a/net/l2tp/l2tp_ip6.c
+++ b/net/l2tp/l2tp_ip6.c
@@ -806,8 +806,8 @@ MODULE_AUTHOR("Chris Elston <celston@katalix.com>");
 MODULE_DESCRIPTION("L2TP IP encapsulation for IPv6");
 MODULE_VERSION("1.0");
 
-/* Use the value of SOCK_DGRAM (2) directory, because __stringify doesn't like
- * enums
+/* Use the values of SOCK_DGRAM (2) as type and IPPROTO_L2TP (115) as protocol,
+ * because __stringify doesn't like enums
  */
-MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 2, IPPROTO_L2TP);
-MODULE_ALIAS_NET_PF_PROTO(PF_INET6, IPPROTO_L2TP);
+MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 115, 2);
+MODULE_ALIAS_NET_PF_PROTO(PF_INET6, 115);
-- 
2.39.2

RE: [PATCH] l2tp: generate correct module alias strings

[Drewek, Wojciech]

> -----Original Message-----
> From: Andrea Righi <andrea.righi@canonical.com>
> Sent: czwartek, 30 marca 2023 11:55
> To: David Miller <davem@davemloft.net>; Eric Dumazet <edumazet@google.com>; Jakub Kicinski <kuba@kernel.org>; Paolo Abeni
> <pabeni@redhat.com>
> Cc: Shuah Khan <shuah@kernel.org>; Drewek, Wojciech <wojciech.drewek@intel.com>; netdev@vger.kernel.org; linux-
> kselftest@vger.kernel.org; linux-kernel@vger.kernel.org
> Subject: [PATCH] l2tp: generate correct module alias strings
> 
> Commit 65b32f801bfb ("uapi: move IPPROTO_L2TP to in.h") moved the
> definition of IPPROTO_L2TP from a define to an enum, but since
> __stringify doesn't work properly with enums, we ended up breaking the
> modalias strings for the l2tp modules:
> 
>  $ modinfo l2tp_ip l2tp_ip6 | grep alias
>  alias:          net-pf-2-proto-IPPROTO_L2TP
>  alias:          net-pf-2-proto-2-type-IPPROTO_L2TP
>  alias:          net-pf-10-proto-IPPROTO_L2TP
>  alias:          net-pf-10-proto-2-type-IPPROTO_L2TP
> 
> Use the resolved number directly in MODULE_ALIAS_*() macros (as we
> already do with SOCK_DGRAM) to fix the alias strings:
> 
> $ modinfo l2tp_ip l2tp_ip6 | grep alias
> alias:          net-pf-2-proto-115
> alias:          net-pf-2-proto-115-type-2
> alias:          net-pf-10-proto-115
> alias:          net-pf-10-proto-115-type-2
> 
> Moreover, fix the ordering of the parameters passed to
> MODULE_ALIAS_NET_PF_PROTO_TYPE() by switching proto and type.
> 
> Fixes: 65b32f801bfb ("uapi: move IPPROTO_L2TP to in.h")
> Link: https://lore.kernel.org/lkml/ZCQt7hmodtUaBlCP@righiandr-XPS-13-7390
> Signed-off-by: Guillaume Nault <gnault@redhat.com>
> Signed-off-by: Andrea Righi <andrea.righi@canonical.com>

Reviewed-by: Wojciech Drewek <wojciech.drewek@intel.com>
Tested-by:  Wojciech Drewek <wojciech.drewek@intel.com>

> ---
>  net/l2tp/l2tp_ip.c  | 8 ++++----
>  net/l2tp/l2tp_ip6.c | 8 ++++----
>  2 files changed, 8 insertions(+), 8 deletions(-)
> 
> diff --git a/net/l2tp/l2tp_ip.c b/net/l2tp/l2tp_ip.c
> index 4db5a554bdbd..41a74fc84ca1 100644
> --- a/net/l2tp/l2tp_ip.c
> +++ b/net/l2tp/l2tp_ip.c
> @@ -677,8 +677,8 @@ MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
>  MODULE_DESCRIPTION("L2TP over IP");
>  MODULE_VERSION("1.0");
> 
> -/* Use the value of SOCK_DGRAM (2) directory, because __stringify doesn't like
> - * enums
> +/* Use the values of SOCK_DGRAM (2) as type and IPPROTO_L2TP (115) as protocol,
> + * because __stringify doesn't like enums
>   */
> -MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET, 2, IPPROTO_L2TP);
> -MODULE_ALIAS_NET_PF_PROTO(PF_INET, IPPROTO_L2TP);
> +MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET, 115, 2);
> +MODULE_ALIAS_NET_PF_PROTO(PF_INET, 115);
> diff --git a/net/l2tp/l2tp_ip6.c b/net/l2tp/l2tp_ip6.c
> index 2478aa60145f..5137ea1861ce 100644
> --- a/net/l2tp/l2tp_ip6.c
> +++ b/net/l2tp/l2tp_ip6.c
> @@ -806,8 +806,8 @@ MODULE_AUTHOR("Chris Elston <celston@katalix.com>");
>  MODULE_DESCRIPTION("L2TP IP encapsulation for IPv6");
>  MODULE_VERSION("1.0");
> 
> -/* Use the value of SOCK_DGRAM (2) directory, because __stringify doesn't like
> - * enums
> +/* Use the values of SOCK_DGRAM (2) as type and IPPROTO_L2TP (115) as protocol,
> + * because __stringify doesn't like enums
>   */
> -MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 2, IPPROTO_L2TP);
> -MODULE_ALIAS_NET_PF_PROTO(PF_INET6, IPPROTO_L2TP);
> +MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 115, 2);
> +MODULE_ALIAS_NET_PF_PROTO(PF_INET6, 115);
> --
> 2.39.2

Re: [PATCH] l2tp: generate correct module alias strings

[Guillaume Nault]

On Thu, Mar 30, 2023 at 11:54:42AM +0200, Andrea Righi wrote:
> Commit 65b32f801bfb ("uapi: move IPPROTO_L2TP to in.h") moved the
> definition of IPPROTO_L2TP from a define to an enum, but since
> __stringify doesn't work properly with enums, we ended up breaking the
> modalias strings for the l2tp modules:
> 
>  $ modinfo l2tp_ip l2tp_ip6 | grep alias
>  alias:          net-pf-2-proto-IPPROTO_L2TP
>  alias:          net-pf-2-proto-2-type-IPPROTO_L2TP
>  alias:          net-pf-10-proto-IPPROTO_L2TP
>  alias:          net-pf-10-proto-2-type-IPPROTO_L2TP
> 
> Use the resolved number directly in MODULE_ALIAS_*() macros (as we
> already do with SOCK_DGRAM) to fix the alias strings:
> 
> $ modinfo l2tp_ip l2tp_ip6 | grep alias
> alias:          net-pf-2-proto-115
> alias:          net-pf-2-proto-115-type-2
> alias:          net-pf-10-proto-115
> alias:          net-pf-10-proto-115-type-2
> 
> Moreover, fix the ordering of the parameters passed to
> MODULE_ALIAS_NET_PF_PROTO_TYPE() by switching proto and type.

Thanks!

Just to be explicit to the maintainers, this patch is for the net tree
(next time, you can use [PATCH net] to make that clear).

> Fixes: 65b32f801bfb ("uapi: move IPPROTO_L2TP to in.h")
> Link: https://lore.kernel.org/lkml/ZCQt7hmodtUaBlCP@righiandr-XPS-13-7390
> Signed-off-by: Guillaume Nault <gnault@redhat.com>
> Signed-off-by: Andrea Righi <andrea.righi@canonical.com>
> ---
>  net/l2tp/l2tp_ip.c  | 8 ++++----
>  net/l2tp/l2tp_ip6.c | 8 ++++----
>  2 files changed, 8 insertions(+), 8 deletions(-)
> 
> diff --git a/net/l2tp/l2tp_ip.c b/net/l2tp/l2tp_ip.c
> index 4db5a554bdbd..41a74fc84ca1 100644
> --- a/net/l2tp/l2tp_ip.c
> +++ b/net/l2tp/l2tp_ip.c
> @@ -677,8 +677,8 @@ MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
>  MODULE_DESCRIPTION("L2TP over IP");
>  MODULE_VERSION("1.0");
>  
> -/* Use the value of SOCK_DGRAM (2) directory, because __stringify doesn't like
> - * enums
> +/* Use the values of SOCK_DGRAM (2) as type and IPPROTO_L2TP (115) as protocol,
> + * because __stringify doesn't like enums
>   */
> -MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET, 2, IPPROTO_L2TP);
> -MODULE_ALIAS_NET_PF_PROTO(PF_INET, IPPROTO_L2TP);
> +MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET, 115, 2);
> +MODULE_ALIAS_NET_PF_PROTO(PF_INET, 115);
> diff --git a/net/l2tp/l2tp_ip6.c b/net/l2tp/l2tp_ip6.c
> index 2478aa60145f..5137ea1861ce 100644
> --- a/net/l2tp/l2tp_ip6.c
> +++ b/net/l2tp/l2tp_ip6.c
> @@ -806,8 +806,8 @@ MODULE_AUTHOR("Chris Elston <celston@katalix.com>");
>  MODULE_DESCRIPTION("L2TP IP encapsulation for IPv6");
>  MODULE_VERSION("1.0");
>  
> -/* Use the value of SOCK_DGRAM (2) directory, because __stringify doesn't like
> - * enums
> +/* Use the values of SOCK_DGRAM (2) as type and IPPROTO_L2TP (115) as protocol,
> + * because __stringify doesn't like enums
>   */
> -MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 2, IPPROTO_L2TP);
> -MODULE_ALIAS_NET_PF_PROTO(PF_INET6, IPPROTO_L2TP);
> +MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 115, 2);
> +MODULE_ALIAS_NET_PF_PROTO(PF_INET6, 115);
> -- 
> 2.39.2
> 

Re: [PATCH] l2tp: generate correct module alias strings

[patchwork-bot+netdevbpf]

Hello:

This patch was applied to netdev/net.git (main)
by David S. Miller <davem@davemloft.net>:

On Thu, 30 Mar 2023 11:54:42 +0200 you wrote:
> Commit 65b32f801bfb ("uapi: move IPPROTO_L2TP to in.h") moved the
> definition of IPPROTO_L2TP from a define to an enum, but since
> __stringify doesn't work properly with enums, we ended up breaking the
> modalias strings for the l2tp modules:
> 
>  $ modinfo l2tp_ip l2tp_ip6 | grep alias
>  alias:          net-pf-2-proto-IPPROTO_L2TP
>  alias:          net-pf-2-proto-2-type-IPPROTO_L2TP
>  alias:          net-pf-10-proto-IPPROTO_L2TP
>  alias:          net-pf-10-proto-2-type-IPPROTO_L2TP
> 
> [...]

Here is the summary with links:
  - l2tp: generate correct module alias strings
    https://git.kernel.org/netdev/net/c/154e07c16485

You are awesome, thank you!
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