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linux: add sysctl to pass untranslated interface names

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Reviewed by:	kib
MFC after:	2 weeks
Differential Revision: https://reviews.freebsd.org/D33792
This commit is contained in:
Alexander V. Chernikov 2022-01-08 15:41:53 +00:00
parent 96c524d8b2
commit 1f70a85b4c
6 changed files with 29 additions and 15 deletions
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9
sys/compat/linprocfs/linprocfs.c
View file

@ -1412,11 +1412,6 @@ linprocfs_doprocmem(PFS_FILL_ARGS)
return (error);
}
/*
* Criteria for interface name translation
*/
#define IFP_IS_ETH(ifp) (ifp->if_type == IFT_ETHER)
static int
linux_ifname(struct ifnet *ifp, char *buffer, size_t buflen)
{
@ -1426,7 +1421,7 @@ linux_ifname(struct ifnet *ifp, char *buffer, size_t buflen)
IFNET_RLOCK_ASSERT();
/* Short-circuit non ethernet interfaces */
if (!IFP_IS_ETH(ifp))
if (linux_use_real_ifname(ifp))
return (strlcpy(buffer, ifp->if_xname, buflen));
/* Determine the (relative) unit number for ethernet interfaces */
@ -1434,7 +1429,7 @@ linux_ifname(struct ifnet *ifp, char *buffer, size_t buflen)
CK_STAILQ_FOREACH(ifscan, &V_ifnet, if_link) {
if (ifscan == ifp)
return (snprintf(buffer, buflen, "eth%d", ethno));
if (IFP_IS_ETH(ifscan))
if (!linux_use_real_ifname(ifscan))
ethno++;
}

6
sys/compat/linux/linux.h
View file

@ -55,12 +55,6 @@
#define LINUX_IFHWADDRLEN 6
#define LINUX_IFNAMSIZ 16
/*
* Criteria for interface name translation
*/
#define IFP_IS_ETH(ifp) (ifp->if_type == IFT_ETHER)
#define IFP_IS_LOOP(ifp) (ifp->if_type == IFT_LOOP)
struct l_sockaddr {
unsigned short sa_family;
char sa_data[14];

4
sys/compat/linux/linux_ioctl.c
View file

@ -2121,7 +2121,7 @@ linux_ioctl_ifname(struct thread *td, struct l_ifreq *uifr)
error = ENODEV;
CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) {
if (ifr.ifr_ifindex == index) {
if (IFP_IS_ETH(ifp))
if (!linux_use_real_ifname(ifp))
snprintf(ifr.ifr_name, LINUX_IFNAMSIZ,
"eth%d", ethno);
else
@ -2130,7 +2130,7 @@ linux_ioctl_ifname(struct thread *td, struct l_ifreq *uifr)
error = 0;
break;
}
if (IFP_IS_ETH(ifp))
if (!linux_use_real_ifname(ifp))
ethno++;
index++;
}

15
sys/compat/linux/linux_util.c
View file

@ -50,6 +50,10 @@ __FBSDID("$FreeBSD$");
#include <sys/systm.h>
#include <sys/vnode.h>
#include <net/if.h>
#include <net/if_var.h>
#include <net/if_types.h>
#include <machine/stdarg.h>
#include <compat/linux/linux_dtrace.h>
@ -82,6 +86,11 @@ SYSCTL_STRING(_compat_linux, OID_AUTO, emul_path, CTLFLAG_RWTUN,
linux_emul_path, sizeof(linux_emul_path),
"Linux runtime environment path");
static bool use_real_ifnames = false;
SYSCTL_BOOL(_compat_linux, OID_AUTO, use_real_ifnames, CTLFLAG_RWTUN,
&use_real_ifnames, 0,
"Use FreeBSD interface names instead of generating ethN aliases");
/*
* Search an alternate path before passing pathname arguments on to
* system calls. Useful for keeping a separate 'emulation tree'.
@ -315,3 +324,9 @@ linux_device_unregister_handler(struct linux_device_handler *d)
return (EINVAL);
}
bool
linux_use_real_ifname(const struct ifnet *ifp)
{
return (use_real_ifnames || !IFP_IS_ETH(ifp));
}

9
sys/compat/linux/linux_util.h
View file

@ -120,6 +120,15 @@ int linux_vn_get_major_minor(const struct vnode *vn, int *major, int *minor);
char *linux_get_char_devices(void);
void linux_free_get_char_devices(char *string);
/*
* Criteria for interface name translation
*/
#define IFP_IS_ETH(ifp) ((ifp)->if_type == IFT_ETHER)
#define IFP_IS_LOOP(ifp) ((ifp)->if_type == IFT_LOOP)
struct ifnet;
bool linux_use_real_ifname(const struct ifnet *ifp);
#if defined(KTR)
#define KTR_LINUX KTR_SUBSYS

1
sys/modules/linux_common/Makefile
View file

@ -11,6 +11,7 @@ EXPORT_SYMS=
EXPORT_SYMS+= linux_emul_path
EXPORT_SYMS+= linux_get_osname
EXPORT_SYMS+= linux_get_osrelease
EXPORT_SYMS+= linux_use_real_ifname
.if !defined(KERNBUILDDIR)
.warning Building Linuxulator outside of a kernel does not make sense