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101 lines
5.4 KiB
101 lines
5.4 KiB
2 years ago
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From 033998c21f01e7b7d91e4aa51a358f8016f3740a Mon Sep 17 00:00:00 2001
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From: Viktor Mihajlovski <mihajlov@linux.ibm.com>
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Date: Tue, 27 Apr 2021 15:25:16 +0200
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Subject: [PATCH] udev: allow onboard index up to 65535
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The maximum allowed value of the sysfs device index entry was limited to
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16383 (2^14-1) to avoid the generation of unreasonable onboard interface
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names.
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For s390 the index can assume a value of up to 65535 (2^16-1) which is
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now allowed depending on the new naming flag NAMING_16BIT_INDEX.
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Larger index values are considered unreasonable and remain to be
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ignored.
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Related: #1939914
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(cherry picked from commit 5a7eb46c0206411d380543021291b4bca0b6f59f)
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---
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man/systemd.net-naming-scheme.xml | 7 ++++++-
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src/udev/udev-builtin-net_id.c | 22 +++++++++++++++-------
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2 files changed, 21 insertions(+), 8 deletions(-)
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diff --git a/man/systemd.net-naming-scheme.xml b/man/systemd.net-naming-scheme.xml
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index e42c93eaad..a567483995 100644
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--- a/man/systemd.net-naming-scheme.xml
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+++ b/man/systemd.net-naming-scheme.xml
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@@ -320,7 +320,12 @@
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of the <filename>function_id</filename> device attribute. This attribute is now used to build the
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<varname>ID_NET_NAME_SLOT</varname>. Before that, all slot names were parsed as decimal
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numbers, which could either result in an incorrect value of the <varname>ID_NET_NAME_SLOT</varname>
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- property or none at all.</para></listitem>
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+ property or none at all.</para>
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+
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+ <para>Some firmware and hypervisor implementations report unreasonable high numbers for the onboard
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+ index. To prevent the generation of bogus onbard interface names, index numbers greater than 16381
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+ (2^14-1) were ignored. For s390 PCI devices index values up to 65535 (2^16-1) are valid. To account
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+ for that, the limit is increased to now 65535.</para></listitem>
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</varlistentry>
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<para>Note that <constant>latest</constant> may be used to denote the latest scheme known to this
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diff --git a/src/udev/udev-builtin-net_id.c b/src/udev/udev-builtin-net_id.c
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index ba7638fcb8..df84acf27c 100644
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--- a/src/udev/udev-builtin-net_id.c
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+++ b/src/udev/udev-builtin-net_id.c
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@@ -104,7 +104,8 @@
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#include "udev.h"
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#include "udev-util.h"
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-#define ONBOARD_INDEX_MAX (16*1024-1)
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+#define ONBOARD_14BIT_INDEX_MAX ((1U << 14) - 1)
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+#define ONBOARD_16BIT_INDEX_MAX ((1U << 16) - 1)
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/* So here's the deal: net_id is supposed to be an excercise in providing stable names for network devices. However, we
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* also want to keep updating the naming scheme used in future versions of net_id. These two goals of course are
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@@ -127,6 +128,7 @@ typedef enum NamingSchemeFlags {
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NAMING_NPAR_ARI = 1 << 1, /* Use NPAR "ARI", see 6bc04997b6eab35d1cb9fa73889892702c27be09 */
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NAMING_BRIDGE_NO_SLOT = 1 << 9, /* Don't use PCI hotplug slot information if the corresponding device is a PCI bridge */
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NAMING_SLOT_FUNCTION_ID = 1 << 10, /* Use function_id if present to identify PCI hotplug slots */
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+ NAMING_16BIT_INDEX = 1 << 11, /* Allow full 16-bit for the onboard index */
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/* And now the masks that combine the features above */
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NAMING_V238 = 0,
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@@ -138,7 +140,7 @@ typedef enum NamingSchemeFlags {
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NAMING_RHEL_8_4 = NAMING_V239|NAMING_BRIDGE_NO_SLOT,
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NAMING_RHEL_8_5 = NAMING_RHEL_8_4,
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NAMING_RHEL_8_6 = NAMING_RHEL_8_4,
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- NAMING_RHEL_8_7 = NAMING_RHEL_8_4|NAMING_SLOT_FUNCTION_ID,
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+ NAMING_RHEL_8_7 = NAMING_RHEL_8_4|NAMING_SLOT_FUNCTION_ID|NAMING_16BIT_INDEX,
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_NAMING_SCHEME_FLAGS_INVALID = -1,
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} NamingSchemeFlags;
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@@ -326,6 +328,16 @@ out_unref:
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return r;
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}
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+static bool is_valid_onboard_index(unsigned long idx) {
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+ /* Some BIOSes report rubbish indexes that are excessively high (2^24-1 is an index VMware likes to
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+ * report for example). Let's define a cut-off where we don't consider the index reliable anymore. We
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+ * pick some arbitrary cut-off, which is somewhere beyond the realistic number of physical network
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+ * interface a system might have. Ideally the kernel would already filter this crap for us, but it
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+ * doesn't currently. The initial cut-off value (2^14-1) was too conservative for s390 PCI which
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+ * allows for index values up 2^16-1 which is now enabled with the NAMING_16BIT_INDEX naming flag. */
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+ return idx <= (naming_scheme_has(NAMING_16BIT_INDEX) ? ONBOARD_16BIT_INDEX_MAX : ONBOARD_14BIT_INDEX_MAX);
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+}
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+
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/* retrieve on-board index number and label from firmware */
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static int dev_pci_onboard(struct udev_device *dev, struct netnames *names) {
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unsigned dev_port = 0;
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@@ -346,11 +358,7 @@ static int dev_pci_onboard(struct udev_device *dev, struct netnames *names) {
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if (idx <= 0)
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return -EINVAL;
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- /* Some BIOSes report rubbish indexes that are excessively high (2^24-1 is an index VMware likes to report for
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- * example). Let's define a cut-off where we don't consider the index reliable anymore. We pick some arbitrary
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- * cut-off, which is somewhere beyond the realistic number of physical network interface a system might
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- * have. Ideally the kernel would already filter his crap for us, but it doesn't currently. */
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- if (idx > ONBOARD_INDEX_MAX)
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+ if (!is_valid_onboard_index(idx))
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return -ENOENT;
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/* kernel provided port index for multiple ports on a single PCI function */
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