[PATCH net-next v2] tools: ynl-gen: use big-endian netlink attribute types

[PATCH net-next v2] tools: ynl-gen: use big-endian netlink attribute types

[Asbjørn Sloth Tønnesen]

Change ynl-gen-c.py to use NLA_BE16 and NLA_BE32 types to represent
big-endian u16 and u32 ynl types.

Doing this enables those attributes to have range checks applied, as
the validator will then convert to host endianness prior to validation.

The autogenerated kernel/uapi code have been regenerated by running:
  ./tools/net/ynl/ynl-regen.sh -f

This changes the policy types of the following attributes:

  FOU_ATTR_PORT (NLA_U16 -> NLA_BE16)
  FOU_ATTR_PEER_PORT (NLA_U16 -> NLA_BE16)
    These two are used with nla_get_be16/nla_put_be16().

  MPTCP_PM_ADDR_ATTR_ADDR4 (NLA_U32 -> NLA_BE32)
    This one is used with nla_get_in_addr/nla_put_in_addr(),
    which uses nla_get_be32/nla_put_be32().

IOWs the generated changes are AFAICT aligned with their implementations.

The generated userspace code remains identical, and have been verified
by comparing the output generated by the following command:
  make -C tools/net/ynl/generated

Signed-off-by: Asbjørn Sloth Tønnesen <ast@fiberby.net>

---
Changelog:

v2:
- Re-implement to avoid adding a new Type attribute (Requested by Jakub).

v1: https://lore.kernel.org/netdev/20240913085555.134788-1-ast@fiberby.net/
---
 net/ipv4/fou_nl.c          | 4 ++--
 net/mptcp/mptcp_pm_gen.c   | 2 +-
 tools/net/ynl/ynl-gen-c.py | 5 ++++-
 3 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/net/ipv4/fou_nl.c b/net/ipv4/fou_nl.c
index 98b90107b5ab..3d9614609b2d 100644
--- a/net/ipv4/fou_nl.c
+++ b/net/ipv4/fou_nl.c
@@ -12,7 +12,7 @@
 
 /* Global operation policy for fou */
 const struct nla_policy fou_nl_policy[FOU_ATTR_IFINDEX + 1] = {
-	[FOU_ATTR_PORT] = { .type = NLA_U16, },
+	[FOU_ATTR_PORT] = { .type = NLA_BE16, },
 	[FOU_ATTR_AF] = { .type = NLA_U8, },
 	[FOU_ATTR_IPPROTO] = { .type = NLA_U8, },
 	[FOU_ATTR_TYPE] = { .type = NLA_U8, },
@@ -21,7 +21,7 @@ const struct nla_policy fou_nl_policy[FOU_ATTR_IFINDEX + 1] = {
 	[FOU_ATTR_LOCAL_V6] = { .len = 16, },
 	[FOU_ATTR_PEER_V4] = { .type = NLA_U32, },
 	[FOU_ATTR_PEER_V6] = { .len = 16, },
-	[FOU_ATTR_PEER_PORT] = { .type = NLA_U16, },
+	[FOU_ATTR_PEER_PORT] = { .type = NLA_BE16, },
 	[FOU_ATTR_IFINDEX] = { .type = NLA_S32, },
 };
 
diff --git a/net/mptcp/mptcp_pm_gen.c b/net/mptcp/mptcp_pm_gen.c
index c30a2a90a192..5a6b2b4510d3 100644
--- a/net/mptcp/mptcp_pm_gen.c
+++ b/net/mptcp/mptcp_pm_gen.c
@@ -14,7 +14,7 @@
 const struct nla_policy mptcp_pm_address_nl_policy[MPTCP_PM_ADDR_ATTR_IF_IDX + 1] = {
 	[MPTCP_PM_ADDR_ATTR_FAMILY] = { .type = NLA_U16, },
 	[MPTCP_PM_ADDR_ATTR_ID] = { .type = NLA_U8, },
-	[MPTCP_PM_ADDR_ATTR_ADDR4] = { .type = NLA_U32, },
+	[MPTCP_PM_ADDR_ATTR_ADDR4] = { .type = NLA_BE32, },
 	[MPTCP_PM_ADDR_ATTR_ADDR6] = NLA_POLICY_EXACT_LEN(16),
 	[MPTCP_PM_ADDR_ATTR_PORT] = { .type = NLA_U16, },
 	[MPTCP_PM_ADDR_ATTR_FLAGS] = { .type = NLA_U32, },
diff --git a/tools/net/ynl/ynl-gen-c.py b/tools/net/ynl/ynl-gen-c.py
index d64cb2b49c44..1a825b4081b2 100755
--- a/tools/net/ynl/ynl-gen-c.py
+++ b/tools/net/ynl/ynl-gen-c.py
@@ -167,7 +167,10 @@ class Type(SpecAttr):
         return '{ .type = ' + policy + ', }'
 
     def attr_policy(self, cw):
-        policy = c_upper('nla-' + self.attr['type'])
+        policy = f'NLA_{c_upper(self.type)}'
+        if self.attr.get('byte-order') == 'big-endian':
+            if self.type in {'u16', 'u32'}:
+                policy = f'NLA_BE{self.type[1:]}'
 
         spec = self._attr_policy(policy)
         cw.p(f"\t[{self.enum_name}] = {spec},")
-- 
2.45.2

Re: [PATCH net-next v2] tools: ynl-gen: use big-endian netlink attribute types

[Matthieu Baerts]

Hi Davide,

On 17/10/2024 11:47, Asbjørn Sloth Tønnesen wrote:
> Change ynl-gen-c.py to use NLA_BE16 and NLA_BE32 types to represent
> big-endian u16 and u32 ynl types.
> 
> Doing this enables those attributes to have range checks applied, as
> the validator will then convert to host endianness prior to validation.
> 
> The autogenerated kernel/uapi code have been regenerated by running:
>   ./tools/net/ynl/ynl-regen.sh -f
> 
> This changes the policy types of the following attributes:
> 
>   FOU_ATTR_PORT (NLA_U16 -> NLA_BE16)
>   FOU_ATTR_PEER_PORT (NLA_U16 -> NLA_BE16)
>     These two are used with nla_get_be16/nla_put_be16().
> 
>   MPTCP_PM_ADDR_ATTR_ADDR4 (NLA_U32 -> NLA_BE32)
>     This one is used with nla_get_in_addr/nla_put_in_addr(),
>     which uses nla_get_be32/nla_put_be32().

This modification looks good to me, but just in case, do you mind having
a quick look, and eventually send your Acked-by, please? :)

(...)

> diff --git a/net/mptcp/mptcp_pm_gen.c b/net/mptcp/mptcp_pm_gen.c
> index c30a2a90a192..5a6b2b4510d3 100644
> --- a/net/mptcp/mptcp_pm_gen.c
> +++ b/net/mptcp/mptcp_pm_gen.c
> @@ -14,7 +14,7 @@
>  const struct nla_policy mptcp_pm_address_nl_policy[MPTCP_PM_ADDR_ATTR_IF_IDX + 1] = {
>  	[MPTCP_PM_ADDR_ATTR_FAMILY] = { .type = NLA_U16, },
>  	[MPTCP_PM_ADDR_ATTR_ID] = { .type = NLA_U8, },
> -	[MPTCP_PM_ADDR_ATTR_ADDR4] = { .type = NLA_U32, },
> +	[MPTCP_PM_ADDR_ATTR_ADDR4] = { .type = NLA_BE32, },
>  	[MPTCP_PM_ADDR_ATTR_ADDR6] = NLA_POLICY_EXACT_LEN(16),
>  	[MPTCP_PM_ADDR_ATTR_PORT] = { .type = NLA_U16, },
>  	[MPTCP_PM_ADDR_ATTR_FLAGS] = { .type = NLA_U32, },

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

Re: [PATCH net-next v2] tools: ynl-gen: use big-endian netlink attribute types

[MPTCP CI]

Hi Asbjørn,

Thank you for your modifications, that's great!

Our CI did some validations and here is its report:

- KVM Validation: normal: Success! ✅
- KVM Validation: debug: Success! ✅
- KVM Validation: btf-normal (only bpftest_all): Success! ✅
- KVM Validation: btf-debug (only bpftest_all): Success! ✅
- Task: https://github.com/multipath-tcp/mptcp_net-next/actions/runs/11382841554

Initiator: Patchew Applier
Commits: https://github.com/multipath-tcp/mptcp_net-next/commits/46f5c2643965
Patchwork: https://patchwork.kernel.org/project/mptcp/list/?series=900162


If there are some issues, you can reproduce them using the same environment as
the one used by the CI thanks to a docker image, e.g.:

    $ cd [kernel source code]
    $ docker run -v "${PWD}:${PWD}:rw" -w "${PWD}" --privileged --rm -it \
        --pull always mptcp/mptcp-upstream-virtme-docker:latest \
        auto-normal

For more details:

    https://github.com/multipath-tcp/mptcp-upstream-virtme-docker


Please note that despite all the efforts that have been already done to have a
stable tests suite when executed on a public CI like here, it is possible some
reported issues are not due to your modifications. Still, do not hesitate to
help us improve that ;-)

Cheers,
MPTCP GH Action bot
Bot operated by Matthieu Baerts (NGI0 Core)

Re: [PATCH net-next v2] tools: ynl-gen: use big-endian netlink attribute types

[Simon Horman]

On Thu, Oct 17, 2024 at 09:47:02AM +0000, Asbjørn Sloth Tønnesen wrote:
> Change ynl-gen-c.py to use NLA_BE16 and NLA_BE32 types to represent
> big-endian u16 and u32 ynl types.
> 
> Doing this enables those attributes to have range checks applied, as
> the validator will then convert to host endianness prior to validation.
> 
> The autogenerated kernel/uapi code have been regenerated by running:
>   ./tools/net/ynl/ynl-regen.sh -f
> 
> This changes the policy types of the following attributes:
> 
>   FOU_ATTR_PORT (NLA_U16 -> NLA_BE16)
>   FOU_ATTR_PEER_PORT (NLA_U16 -> NLA_BE16)
>     These two are used with nla_get_be16/nla_put_be16().
> 
>   MPTCP_PM_ADDR_ATTR_ADDR4 (NLA_U32 -> NLA_BE32)
>     This one is used with nla_get_in_addr/nla_put_in_addr(),
>     which uses nla_get_be32/nla_put_be32().
> 
> IOWs the generated changes are AFAICT aligned with their implementations.
> 
> The generated userspace code remains identical, and have been verified
> by comparing the output generated by the following command:
>   make -C tools/net/ynl/generated
> 
> Signed-off-by: Asbjørn Sloth Tønnesen <ast@fiberby.net>
> 
> ---
> Changelog:
> 
> v2:
> - Re-implement to avoid adding a new Type attribute (Requested by Jakub).
> 
> v1: https://lore.kernel.org/netdev/20240913085555.134788-1-ast@fiberby.net/

Thanks for addressing Jakub's review of v1.

Reviewed-by: Simon Horman <horms@kernel.org>

Re: [PATCH net-next v2] tools: ynl-gen: use big-endian netlink attribute types

[patchwork-bot+netdevbpf]

Hello:

This patch was applied to netdev/net-next.git (main)
by Paolo Abeni <pabeni@redhat.com>:

On Thu, 17 Oct 2024 09:47:02 +0000 you wrote:
> Change ynl-gen-c.py to use NLA_BE16 and NLA_BE32 types to represent
> big-endian u16 and u32 ynl types.
> 
> Doing this enables those attributes to have range checks applied, as
> the validator will then convert to host endianness prior to validation.
> 
> The autogenerated kernel/uapi code have been regenerated by running:
>   ./tools/net/ynl/ynl-regen.sh -f
> 
> [...]

Here is the summary with links:
  - [net-next,v2] tools: ynl-gen: use big-endian netlink attribute types
    https://git.kernel.org/netdev/net-next/c/867d13a75488

You are awesome, thank you!
-- 
Deet-doot-dot, I am a bot.
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