[Bug 2091425] [NEW] iptables-netflow-dkms FTBS in Noble with linux-6.11-hwe kernel

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[ Impact ]

iptables-netflow-dkms does not compile from source in Noble with kernel
6.11:

/var/lib/dkms/ipt-netflow/2.6/build/ipt_NETFLOW.c: At top level:
/var/lib/dkms/ipt-netflow/2.6/build/ipt_NETFLOW.c:1807:35: error: initialization of ‘int (*)(const struct ctl_table *, int,  void *, size_t *, loff_t *)’ {aka ‘int (*)(const struct ctl_table *, int,  void *, long unsigned int *, long long int *)’} from incompatible pointer type ‘int (*)(struct ctl_table *, int,  void *, size_t *, loff_t *)’ {aka ‘int (*)(struct ctl_table *, int,  void *, long unsigned int *, long long int *)’} [-Werror=incompatible-pointer-types]
 1807 |                 .proc_handler   = &hsize_procctl,
      |                                   ^
/var/lib/dkms/ipt-netflow/2.6/build/ipt_NETFLOW.c:1807:35: note: (near initialization for ‘netflow_sysctl_table[3].proc_handler’)
/var/lib/dkms/ipt-netflow/2.6/build/ipt_NETFLOW.c:1813:35: error: initialization of ‘int (*)(const struct ctl_table *, int,  void *, size_t *, loff_t *)’ {aka ‘int (*)(const struct ctl_table *, int,  void *, long unsigned int *, long long int *)’} from incompatible pointer type ‘int (*)(struct ctl_table *, int,  void *, size_t *, loff_t *)’ {aka ‘int (*)(struct ctl_table *, int,  void *, long unsigned int *, long long int *)’} [-Werror=incompatible-pointer-types]
 1813 |                 .proc_handler   = &sndbuf_procctl,
      |                                   ^
/var/lib/dkms/ipt-netflow/2.6/build/ipt_NETFLOW.c:1813:35: note: (near initialization for ‘netflow_sysctl_table[4].proc_handler’)
/var/lib/dkms/ipt-netflow/2.6/build/ipt_NETFLOW.c:1820:35: error: initialization of ‘int (*)(const struct ctl_table *, int,  void *, size_t *, loff_t *)’ {aka ‘int (*)(const struct ctl_table *, int,  void *, long unsigned int *, long long int *)’} from incompatible pointer type ‘int (*)(struct ctl_table *, int,  void *, size_t *, loff_t *)’ {aka ‘int (*)(struct ctl_table *, int,  void *, long unsigned int *, long long int *)’} [-Werror=incompatible-pointer-types]
 1820 |                 .proc_handler   = &destination_procctl,
      |                                   ^
/var/lib/dkms/ipt-netflow/2.6/build/ipt_NETFLOW.c:1820:35: note: (near initialization for ‘netflow_sysctl_table[5].proc_handler’)
/var/lib/dkms/ipt-netflow/2.6/build/ipt_NETFLOW.c:1842:35: error: initialization of ‘int (*)(const struct ctl_table *, int,  void *, size_t *, loff_t *)’ {aka ‘int (*)(const struct ctl_table *, int,  void *, long unsigned int *, long long int *)’} from incompatible pointer type ‘int (*)(struct ctl_table *, int,  void *, size_t *, loff_t *)’ {aka ‘int (*)(struct ctl_table *, int,  void *, long unsigned int *, long long int *)’} [-Werror=incompatible-pointer-types]
 1842 |                 .proc_handler   = &flush_procctl,
      |                                   ^
/var/lib/dkms/ipt-netflow/2.6/build/ipt_NETFLOW.c:1842:35: note: (near initialization for ‘netflow_sysctl_table[7].proc_handler’)
/var/lib/dkms/ipt-netflow/2.6/build/ipt_NETFLOW.c:1848:35: error: initialization of ‘int (*)(const struct ctl_table *, int,  void *, size_t *, loff_t *)’ {aka ‘int (*)(const struct ctl_table *, int,  void *, long unsigned int *, long long int *)’} from incompatible pointer type ‘int (*)(struct ctl_table *, int,  void *, size_t *, loff_t *)’ {aka ‘int (*)(struct ctl_table *, int,  void *, long unsigned int *, long long int *)’} [-Werror=incompatible-pointer-types]
 1848 |                 .proc_handler   = &protocol_procctl,
      |                                   ^
/var/lib/dkms/ipt-netflow/2.6/build/ipt_NETFLOW.c:1848:35: note: (near initialization for ‘netflow_sysctl_table[8].proc_handler’)
/var/lib/dkms/ipt-netflow/2.6/build/ipt_NETFLOW.c:1870:35: error: initialization of ‘int (*)(const struct ctl_table *, int,  void *, size_t *, loff_t *)’ {aka ‘int (*)(const struct ctl_table *, int,  void *, long unsigned int *, long long int *)’} from incompatible pointer type ‘int (*)(struct ctl_table *, int,  void *, size_t *, loff_t *)’ {aka ‘int (*)(struct ctl_table *, int,  void *, long unsigned int *, long long int *)’} [-Werror=incompatible-pointer-types]
 1870 |                 .proc_handler   = &promisc_procctl,
      |                                   ^
/var/lib/dkms/ipt-netflow/2.6/build/ipt_NETFLOW.c:1870:35: note: (near initialization for ‘netflow_sysctl_table[11].proc_handler’)
/var/lib/dkms/ipt-netflow/2.6/build/ipt_NETFLOW.c:1879:35: error: initialization of ‘int (*)(const struct ctl_table *, int,  void *, size_t *, loff_t *)’ {aka ‘int (*)(const struct ctl_table *, int,  void *, long unsigned int *, long long int *)’} from incompatible pointer type ‘int (*)(struct ctl_table *, int,  void *, size_t *, loff_t *)’ {aka ‘int (*)(struct ctl_table *, int,  void *, long unsigned int *, long long int *)’} [-Werror=incompatible-pointer-types]
 1879 |                 .proc_handler   = &sampler_procctl,
      |                                   ^
/var/lib/dkms/ipt-netflow/2.6/build/ipt_NETFLOW.c:1879:35: note: (near initialization for ‘netflow_sysctl_table[12].proc_handler’)
/var/lib/dkms/ipt-netflow/2.6/build/ipt_NETFLOW.c:1897:35: error: initialization of ‘int (*)(const struct ctl_table *, int,  void *, size_t *, loff_t *)’ {aka ‘int (*)(const struct ctl_table *, int,  void *, long unsigned int *, long long int *)’} from incompatible pointer type ‘int (*)(struct ctl_table *, int,  void *, size_t *, loff_t *)’ {aka ‘int (*)(struct ctl_table *, int,  void *, long unsigned int *, long long int *)’} [-Werror=incompatible-pointer-types]
 1897 |                 .proc_handler   = &snmp_procctl,
      |                                   ^
/var/lib/dkms/ipt-netflow/2.6/build/ipt_NETFLOW.c:1897:35: note: (near initialization for ‘netflow_sysctl_table[14].proc_handler’)
/var/lib/dkms/ipt-netflow/2.6/build/ipt_NETFLOW.c:1905:35: error: initialization of ‘int (*)(const struct ctl_table *, int,  void *, size_t *, loff_t *)’ {aka ‘int (*)(const struct ctl_table *, int,  void *, long unsigned int *, long long int *)’} from incompatible pointer type ‘int (*)(struct ctl_table *, int,  void *, size_t *, loff_t *)’ {aka ‘int (*)(struct ctl_table *, int,  void *, long unsigned int *, long long int *)’} [-Werror=incompatible-pointer-types]
 1905 |                 .proc_handler   = &natevents_procctl,
      |                                   ^

[ Test case ]

Install the latest linux-6.11 kernel on Noble:

$ sudo add-apt-repository ppa:canonical-kernel-team/ppa
$ sudo apt update
$ sudo apt install linux-image-6.11.0-12-generic \
                   linux-modules-6.11.0-12-generic \
                   linux-modules-extra-6.11.0-12-generic \
                   linux-headers-6.11.0-12-generic

Install iptables-netflow-dkms:

$ sudo apt install iptables-netflow-dkms

Load the module:

$ sudo modprobe ipt_NETFLOW

[ Fix ]

Patch the code to properly support the new linux 6.11 ABI.

[ Regression potential]

We may experience networking-related regressions in systems that are
using the iptables-netflow-dkms module and that are using a kernel >=
6.11.

** Affects: iptables-netflow (Ubuntu)
     Importance: Undecided
     Assignee: Massimiliano Pellizzer (mpellizzer)
         Status: In Progress

** Affects: iptables-netflow (Ubuntu Noble)
     Importance: Undecided
         Status: In Progress


** Tags: patch
-- 
iptables-netflow-dkms FTBS in Noble with linux-6.11-hwe kernel
https://bugs.launchpad.net/bugs/2091425
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