Date: Thu, 23 Feb 2023 08:01:36 GMT From: Dmitry Chagin <dchagin@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org Subject: git: 3ab3c9c29cf0 - main - linux(4): Consolidate a FreeBSD interface names translation code Message-ID: <202302230801.31N81aNX029608@gitrepo.freebsd.org>
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The branch main has been updated by dchagin: URL: https://cgit.FreeBSD.org/src/commit/?id=3ab3c9c29cf0e5df8dbbaaf2003456445534bad8 commit 3ab3c9c29cf0e5df8dbbaaf2003456445534bad8 Author: Dmitry Chagin <dchagin@FreeBSD.org> AuthorDate: 2023-02-23 08:00:29 +0000 Commit: Dmitry Chagin <dchagin@FreeBSD.org> CommitDate: 2023-02-23 08:00:29 +0000 linux(4): Consolidate a FreeBSD interface names translation code We have some amount of interface names translation functions which are differs by bugs implementation. Consolidates it in a one place. Fixup loopback interface names translation and use ifnet methods and accessors, where possible. Reviewed by: melifaro Differential Revision: https://reviews.freebsd.org/D38714 MFC after: 3 days X-MFC with: 32fdc75fe7 --- sys/compat/linprocfs/linprocfs.c | 40 +++++------------- sys/compat/linux/linux.c | 87 ++++++++++++++++++++++++++++++++++++++-- sys/compat/linux/linux_common.h | 4 ++ sys/compat/linux/linux_ioctl.c | 56 +++++++------------------- 4 files changed, 113 insertions(+), 74 deletions(-) diff --git a/sys/compat/linprocfs/linprocfs.c b/sys/compat/linprocfs/linprocfs.c index 15c4d3c41749..83b00dc0d7c2 100644 --- a/sys/compat/linprocfs/linprocfs.c +++ b/sys/compat/linprocfs/linprocfs.c @@ -111,6 +111,7 @@ __FBSDID("$FreeBSD$"); #endif /* __i386__ || __amd64__ */ #include <compat/linux/linux.h> +#include <compat/linux/linux_common.h> #include <compat/linux/linux_emul.h> #include <compat/linux/linux_mib.h> #include <compat/linux/linux_misc.h> @@ -1474,36 +1475,13 @@ linprocfs_doprocmem(PFS_FILL_ARGS) return (error); } -static int -linux_ifname(struct ifnet *ifp, char *buffer, size_t buflen) -{ - struct ifnet *ifscan; - int ethno; - - IFNET_RLOCK_ASSERT(); - - /* Short-circuit non ethernet interfaces */ - if (linux_use_real_ifname(ifp)) - return (strlcpy(buffer, ifp->if_xname, buflen)); - - /* Determine the (relative) unit number for ethernet interfaces */ - ethno = 0; - CK_STAILQ_FOREACH(ifscan, &V_ifnet, if_link) { - if (ifscan == ifp) - return (snprintf(buffer, buflen, "eth%d", ethno)); - if (!linux_use_real_ifname(ifscan)) - ethno++; - } - - return (0); -} - /* * Filler function for proc/net/dev */ static int linprocfs_donetdev(PFS_FILL_ARGS) { + struct epoch_tracker et; char ifname[16]; /* XXX LINUX_IFNAMSIZ */ struct ifnet *ifp; @@ -1515,9 +1493,9 @@ linprocfs_donetdev(PFS_FILL_ARGS) "bytes packets errs drop fifo colls carrier compressed"); CURVNET_SET(TD_TO_VNET(curthread)); - IFNET_RLOCK(); + NET_EPOCH_ENTER(et); CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { - linux_ifname(ifp, ifname, sizeof ifname); + ifname_bsd_to_linux_ifp(ifp, ifname, sizeof(ifname)); sbuf_printf(sb, "%6.6s: ", ifname); sbuf_printf(sb, "%7ju %7ju %4ju %4ju %4lu %5lu %10lu %9ju ", (uintmax_t )ifp->if_get_counter(ifp, IFCOUNTER_IBYTES), @@ -1546,7 +1524,7 @@ linprocfs_donetdev(PFS_FILL_ARGS) * tx_heartbeat_errors*/ 0UL); /* tx_compressed */ } - IFNET_RUNLOCK(); + NET_EPOCH_EXIT(et); CURVNET_RESTORE(); return (0); @@ -1576,7 +1554,8 @@ linux_route_print(struct rtentry *rt, void *vw) /* select only first route in case of multipath */ nh = nhop_select_func(rnd.rnd_nhop, 0); - linux_ifname(nh->nh_ifp, ifname, sizeof(ifname)); + if (ifname_bsd_to_linux_ifp(nh->nh_ifp, ifname, sizeof(ifname)) <= 0) + return (ENODEV); gw = (nh->nh_flags & NHF_GATEWAY) ? nh->gw4_sa.sin_addr.s_addr : 0; @@ -1605,6 +1584,7 @@ linux_route_print(struct rtentry *rt, void *vw) static int linprocfs_donetroute(PFS_FILL_ARGS) { + struct epoch_tracker et; struct walkarg w = { .sb = sb }; @@ -1615,9 +1595,9 @@ linprocfs_donetroute(PFS_FILL_ARGS) "\tWindow\tIRTT"); CURVNET_SET(TD_TO_VNET(curthread)); - IFNET_RLOCK(); + NET_EPOCH_ENTER(et); rib_walk(fibnum, AF_INET, false, linux_route_print, &w); - IFNET_RUNLOCK(); + NET_EPOCH_EXIT(et); CURVNET_RESTORE(); return (0); diff --git a/sys/compat/linux/linux.c b/sys/compat/linux/linux.c index 4e435081b3b6..2570a5fcc89c 100644 --- a/sys/compat/linux/linux.c +++ b/sys/compat/linux/linux.c @@ -241,6 +241,84 @@ bsd_to_linux_sigset(sigset_t *bss, l_sigset_t *lss) } } +/* + * Translate a FreeBSD interface name to a Linux interface name + * by interface name, and return the number of bytes copied to lxname. + */ +int +ifname_bsd_to_linux_name(const char *bsdname, char *lxname, size_t len) +{ + struct epoch_tracker et; + struct ifnet *ifp; + int ret; + + ret = 0; + CURVNET_SET(TD_TO_VNET(curthread)); + NET_EPOCH_ENTER(et); + ifp = ifunit(bsdname); + if (ifp != NULL) + ret = ifname_bsd_to_linux_ifp(ifp, lxname, len); + NET_EPOCH_EXIT(et); + CURVNET_RESTORE(); + return (ret); +} + +/* + * Translate a FreeBSD interface name to a Linux interface name + * by interface index, and return the number of bytes copied to lxname. + */ +int +ifname_bsd_to_linux_idx(u_int idx, char *lxname, size_t len) +{ + struct epoch_tracker et; + struct ifnet *ifp; + int ret; + + ret = 0; + CURVNET_SET(TD_TO_VNET(curthread)); + NET_EPOCH_ENTER(et); + ifp = ifnet_byindex(idx); + if (ifp != NULL) + ret = ifname_bsd_to_linux_ifp(ifp, lxname, len); + NET_EPOCH_EXIT(et); + CURVNET_RESTORE(); + return (ret); +} + +/* + * Translate a FreeBSD interface name to a Linux interface name, + * and return the number of bytes copied to lxname. + */ +int +ifname_bsd_to_linux_ifp(struct ifnet *ifp, char *lxname, size_t len) +{ + struct ifnet *ifscan; + int unit; + + NET_EPOCH_ASSERT(); + + /* + * Linux loopback interface name is lo (not lo0), + * we translate lo to lo0, loX to loX. + */ + if (IFP_IS_LOOP(ifp) && strncmp(ifp->if_xname, "lo0", IFNAMSIZ) == 0) + return (strlcpy(lxname, "lo", len)); + + /* Short-circuit non ethernet interfaces. */ + if (!IFP_IS_ETH(ifp) || linux_use_real_ifname(ifp)) + return (strlcpy(lxname, ifp->if_xname, len)); + + /* Determine the (relative) unit number for ethernet interfaces. */ + unit = 0; + CK_STAILQ_FOREACH(ifscan, &V_ifnet, if_link) { + if (ifscan == ifp) + return (snprintf(lxname, len, "eth%d", unit)); + if (IFP_IS_ETH(ifscan)) + unit++; + } + return (0); +} + /* * Translate a Linux interface name to a FreeBSD interface name, * and return the associated ifnet structure @@ -261,8 +339,11 @@ ifname_linux_to_bsd(struct thread *td, const char *lxname, char *bsdname) break; if (len == 0 || len == LINUX_IFNAMSIZ) return (NULL); - /* Linux loopback interface name is lo (not lo0) */ - is_lo = (len == 2 && strncmp(lxname, "lo", len) == 0); + /* + * Linux loopback interface name is lo (not lo0), + * we translate lo to lo0, loX to loX. + */ + is_lo = (len == 2 && strncmp(lxname, "lo", LINUX_IFNAMSIZ) == 0); unit = (int)strtoul(lxname + len, &ep, 10); if ((ep == NULL || ep == lxname + len || ep >= lxname + LINUX_IFNAMSIZ) && is_lo == 0) @@ -732,5 +813,5 @@ bool linux_use_real_ifname(const struct ifnet *ifp) { - return (use_real_ifnames || !IFP_IS_ETH(ifp)); + return (use_real_ifnames); } diff --git a/sys/compat/linux/linux_common.h b/sys/compat/linux/linux_common.h index 0eb302bfcd17..9ebaff26b9ff 100644 --- a/sys/compat/linux/linux_common.h +++ b/sys/compat/linux/linux_common.h @@ -30,6 +30,10 @@ #ifndef _LINUX_COMMON_H_ #define _LINUX_COMMON_H_ +int ifname_bsd_to_linux_ifp(struct ifnet *, char *, size_t); +int ifname_bsd_to_linux_idx(u_int, char *, size_t); +int ifname_bsd_to_linux_name(const char *, char *, size_t); + struct ifnet *ifname_linux_to_bsd(struct thread *td, const char *lxname, char *bsdname); void linux_ifflags(struct ifnet *ifp, short *flags); diff --git a/sys/compat/linux/linux_ioctl.c b/sys/compat/linux/linux_ioctl.c index 2cb0e9ead23f..bfab28f841a0 100644 --- a/sys/compat/linux/linux_ioctl.c +++ b/sys/compat/linux/linux_ioctl.c @@ -2092,39 +2092,17 @@ static int linux_ioctl_ifname(struct thread *td, struct l_ifreq *uifr) { struct l_ifreq ifr; - struct ifnet *ifp; - int error, ethno, index; + int error, ret; error = copyin(uifr, &ifr, sizeof(ifr)); if (error != 0) return (error); - - CURVNET_SET(TD_TO_VNET(curthread)); - IFNET_RLOCK(); - index = 1; /* ifr.ifr_ifindex starts from 1 */ - ethno = 0; - error = ENODEV; - CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { - if (ifr.ifr_ifindex == index) { - if (!linux_use_real_ifname(ifp)) - snprintf(ifr.ifr_name, LINUX_IFNAMSIZ, - "eth%d", ethno); - else - strlcpy(ifr.ifr_name, ifp->if_xname, - LINUX_IFNAMSIZ); - error = 0; - break; - } - if (!linux_use_real_ifname(ifp)) - ethno++; - index++; - } - IFNET_RUNLOCK(); - if (error == 0) - error = copyout(&ifr, uifr, sizeof(ifr)); - CURVNET_RESTORE(); - - return (error); + ret = ifname_bsd_to_linux_idx(ifr.ifr_ifindex, ifr.ifr_name, + LINUX_IFNAMSIZ); + if (ret > 0) + return (copyout(&ifr, uifr, sizeof(ifr))); + else + return (ENODEV); } /* @@ -2134,6 +2112,7 @@ linux_ioctl_ifname(struct thread *td, struct l_ifreq *uifr) static int linux_ifconf(struct thread *td, struct ifconf *uifc) { + struct epoch_tracker et; #ifdef COMPAT_LINUX32 struct l_ifconf ifc; #else @@ -2143,7 +2122,7 @@ linux_ifconf(struct thread *td, struct ifconf *uifc) struct ifnet *ifp; struct ifaddr *ifa; struct sbuf *sb; - int error, ethno, full = 0, valid_len, max_len; + int error, full = 0, valid_len, max_len; error = copyin(uifc, &ifc, sizeof(ifc)); if (error != 0) @@ -2155,7 +2134,7 @@ linux_ifconf(struct thread *td, struct ifconf *uifc) /* handle the 'request buffer size' case */ if ((l_uintptr_t)ifc.ifc_buf == PTROUT(NULL)) { ifc.ifc_len = 0; - IFNET_RLOCK(); + NET_EPOCH_ENTER(et); CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { struct sockaddr *sa = ifa->ifa_addr; @@ -2163,7 +2142,7 @@ linux_ifconf(struct thread *td, struct ifconf *uifc) ifc.ifc_len += sizeof(ifr); } } - IFNET_RUNLOCK(); + NET_EPOCH_EXIT(et); error = copyout(&ifc, uifc, sizeof(ifc)); CURVNET_RESTORE(); return (error); @@ -2175,8 +2154,6 @@ linux_ifconf(struct thread *td, struct ifconf *uifc) } again: - /* Keep track of eth interfaces */ - ethno = 0; if (ifc.ifc_len <= max_len) { max_len = ifc.ifc_len; full = 1; @@ -2186,16 +2163,13 @@ again: valid_len = 0; /* Return all AF_INET addresses of all interfaces */ - IFNET_RLOCK(); + NET_EPOCH_ENTER(et); CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { int addrs = 0; bzero(&ifr, sizeof(ifr)); - if (IFP_IS_ETH(ifp)) - snprintf(ifr.ifr_name, LINUX_IFNAMSIZ, "eth%d", - ethno++); - else - strlcpy(ifr.ifr_name, ifp->if_xname, LINUX_IFNAMSIZ); + ifname_bsd_to_linux_ifp(ifp, ifr.ifr_name, + sizeof(ifr.ifr_name)); /* Walk the address list */ CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { @@ -2222,7 +2196,7 @@ again: valid_len = sbuf_len(sb); } } - IFNET_RUNLOCK(); + NET_EPOCH_EXIT(et); if (valid_len != max_len && !full) { sbuf_delete(sb);
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