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Date: Mon, 23 Oct 2023 11:17:06 -0700
From: Mat Martineau <martineau@...nel.org>
To: "David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>, Matthieu Baerts <matttbe@...nel.org>
Cc: netdev@...r.kernel.org, mptcp@...ts.linux.dev,
Simon Horman <horms@...nel.org>, Mat Martineau <martineau@...nel.org>,
Davide Caratti <dcaratti@...hat.com>
Subject: [PATCH net-next v2 2/7] tools: ynl-gen: add support for exact-len
validation
From: Davide Caratti <dcaratti@...hat.com>
add support for 'exact-len' validation on netlink attributes.
Link: https://github.com/multipath-tcp/mptcp_net-next/issues/340
Acked-by: Matthieu Baerts <matttbe@...nel.org>
Signed-off-by: Davide Caratti <dcaratti@...hat.com>
Signed-off-by: Mat Martineau <martineau@...nel.org>
---
Documentation/netlink/genetlink-c.yaml | 3 +++
Documentation/netlink/genetlink-legacy.yaml | 3 +++
Documentation/netlink/genetlink.yaml | 3 +++
Documentation/netlink/netlink-raw.yaml | 3 +++
tools/net/ynl/ynl-gen-c.py | 28 +++++++++++++++++-----------
5 files changed, 29 insertions(+), 11 deletions(-)
diff --git a/Documentation/netlink/genetlink-c.yaml b/Documentation/netlink/genetlink-c.yaml
index c72c8a428911..7ef2496d57c8 100644
--- a/Documentation/netlink/genetlink-c.yaml
+++ b/Documentation/netlink/genetlink-c.yaml
@@ -199,6 +199,9 @@ properties:
max-len:
description: Max length for a string or a binary attribute.
$ref: '#/$defs/len-or-define'
+ exact-len:
+ description: Exact length for a string or a binary attribute.
+ $ref: '#/$defs/len-or-define'
sub-type: *attr-type
display-hint: &display-hint
description: |
diff --git a/Documentation/netlink/genetlink-legacy.yaml b/Documentation/netlink/genetlink-legacy.yaml
index 05aa81dd6aba..0db4a6d49d6d 100644
--- a/Documentation/netlink/genetlink-legacy.yaml
+++ b/Documentation/netlink/genetlink-legacy.yaml
@@ -242,6 +242,9 @@ properties:
max-len:
description: Max length for a string or a binary attribute.
$ref: '#/$defs/len-or-define'
+ exact-len:
+ description: Exact length for a string or a binary attribute.
+ $ref: '#/$defs/len-or-define'
sub-type: *attr-type
display-hint: *display-hint
# Start genetlink-c
diff --git a/Documentation/netlink/genetlink.yaml b/Documentation/netlink/genetlink.yaml
index 9ceb096b2df2..501ed2e6c8ef 100644
--- a/Documentation/netlink/genetlink.yaml
+++ b/Documentation/netlink/genetlink.yaml
@@ -172,6 +172,9 @@ properties:
max-len:
description: Max length for a string or a binary attribute.
$ref: '#/$defs/len-or-define'
+ exact-len:
+ description: Exact length for a string or a binary attribute.
+ $ref: '#/$defs/len-or-define'
sub-type: *attr-type
display-hint: &display-hint
description: |
diff --git a/Documentation/netlink/netlink-raw.yaml b/Documentation/netlink/netlink-raw.yaml
index d976851b80f8..48db31f1d059 100644
--- a/Documentation/netlink/netlink-raw.yaml
+++ b/Documentation/netlink/netlink-raw.yaml
@@ -240,6 +240,9 @@ properties:
max-len:
description: Max length for a string or a binary attribute.
$ref: '#/$defs/len-or-define'
+ exact-len:
+ description: Exact length for a string or a binary attribute.
+ $ref: '#/$defs/len-or-define'
sub-type: *attr-type
display-hint: *display-hint
# Start genetlink-c
diff --git a/tools/net/ynl/ynl-gen-c.py b/tools/net/ynl/ynl-gen-c.py
index a9e8898c9386..454b7dea274d 100755
--- a/tools/net/ynl/ynl-gen-c.py
+++ b/tools/net/ynl/ynl-gen-c.py
@@ -410,10 +410,13 @@ class TypeString(Type):
return f'.type = YNL_PT_NUL_STR, '
def _attr_policy(self, policy):
- mem = '{ .type = ' + policy
- if 'max-len' in self.checks:
- mem += ', .len = ' + str(self.get_limit('max-len'))
- mem += ', }'
+ if 'exact-len' in self.checks:
+ mem = 'NLA_POLICY_EXACT_LEN(' + str(self.checks['exact-len']) + ')'
+ else:
+ mem = '{ .type = ' + policy
+ if 'max-len' in self.checks:
+ mem += ', .len = ' + str(self.get_limit('max-len'))
+ mem += ', }'
return mem
def attr_policy(self, cw):
@@ -459,14 +462,17 @@ class TypeBinary(Type):
return f'.type = YNL_PT_BINARY,'
def _attr_policy(self, policy):
- mem = '{ '
- if len(self.checks) == 1 and 'min-len' in self.checks:
- mem += '.len = ' + str(self.get_limit('min-len'))
- elif len(self.checks) == 0:
- mem += '.type = NLA_BINARY'
+ if 'exact-len' in self.checks:
+ mem = 'NLA_POLICY_EXACT_LEN(' + str(self.checks['exact-len']) + ')'
else:
- raise Exception('One or more of binary type checks not implemented, yet')
- mem += ', }'
+ mem = '{ '
+ if len(self.checks) == 1 and 'min-len' in self.checks:
+ mem += '.len = ' + str(self.get_limit('min-len'))
+ elif len(self.checks) == 0:
+ mem += '.type = NLA_BINARY'
+ else:
+ raise Exception('One or more of binary type checks not implemented, yet')
+ mem += ', }'
return mem
def attr_put(self, ri, var):
--
2.41.0
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