/* * This file implement the Wireless Extensions spy API. * * Authors : Jean Tourrilhes - HPL - * Copyright (c) 1997-2007 Jean Tourrilhes, All Rights Reserved. * * (As all part of the Linux kernel, this file is GPL) */ #include #include #include #include #include #include #include static inline struct iw_spy_data *get_spydata(struct net_device *dev) { /* This is the new way */ if (dev->wireless_data) return dev->wireless_data->spy_data; return NULL; } int iw_handler_set_spy(struct net_device * dev, struct iw_request_info * info, union iwreq_data * wrqu, char * extra) { struct iw_spy_data * spydata = get_spydata(dev); struct sockaddr * address = (struct sockaddr *) extra; /* Make sure driver is not buggy or using the old API */ if (!spydata) return -EOPNOTSUPP; /* Disable spy collection while we copy the addresses. * While we copy addresses, any call to wireless_spy_update() * will NOP. This is OK, as anyway the addresses are changing. */ spydata->spy_number = 0; /* We want to operate without locking, because wireless_spy_update() * most likely will happen in the interrupt handler, and therefore * have its own locking constraints and needs performance. * The rtnl_lock() make sure we don't race with the other iw_handlers. * This make sure wireless_spy_update() "see" that the spy list * is temporarily disabled. */ smp_wmb(); /* Are there are addresses to copy? */ if (wrqu->data.length > 0) { int i; /* Copy addresses */ for (i = 0; i < wrqu->data.length; i++) memcpy(spydata->spy_address[i], address[i].sa_data, ETH_ALEN); /* Reset stats */ memset(spydata->spy_stat, 0, sizeof(struct iw_quality) * IW_MAX_SPY); } /* Make sure above is updated before re-enabling */ smp_wmb(); /* Enable addresses */ spydata->spy_number = wrqu->data.length; return 0; } EXPORT_SYMBOL(iw_handler_set_spy); int iw_handler_get_spy(struct net_device * dev, struct iw_request_info * info, union iwreq_data * wrqu, char * extra) { struct iw_spy_data * spydata = get_spydata(dev); struct sockaddr * address = (struct sockaddr *) extra; int i; /* Make sure driver is not buggy or using the old API */ if (!spydata) return -EOPNOTSUPP; wrqu->data.length = spydata->spy_number; /* Copy addresses. */ for (i = 0; i < spydata->spy_number; i++) { memcpy(address[i].sa_data, spydata->spy_address[i], ETH_ALEN); address[i].sa_family = AF_UNIX; } /* Copy stats to the user buffer (just after). */ if (spydata->spy_number > 0) memcpy(extra + (sizeof(struct sockaddr) *spydata->spy_number), spydata->spy_stat, sizeof(struct iw_quality) * spydata->spy_number); /* Reset updated flags. */ for (i = 0; i < spydata->spy_number; i++) spydata->spy_stat[i].updated &= ~IW_QUAL_ALL_UPDATED; return 0; } EXPORT_SYMBOL(iw_handler_get_spy); /*------------------------------------------------------------------*/ /* * Standard Wireless Handler : set spy threshold */ int iw_handler_set_thrspy(struct net_device * dev, struct iw_request_info *info, union iwreq_data * wrqu, char * extra) { struct iw_spy_data * spydata = get_spydata(dev); struct iw_thrspy * threshold = (struct iw_thrspy *) extra; /* Make sure driver is not buggy or using the old API */ if (!spydata) return -EOPNOTSUPP; /* Just do it */ memcpy(&(spydata->spy_thr_low), &(threshold->low), 2 * sizeof(struct iw_quality)); /* Clear flag */ memset(spydata->spy_thr_under, '\0', sizeof(spydata->spy_thr_under)); return 0; } EXPORT_SYMBOL(iw_handler_set_thrspy); /*------------------------------------------------------------------*/ /* * Standard Wireless Handler : get spy threshold */ int iw_handler_get_thrspy(struct net_device * dev, struct iw_request_info *info, union iwreq_data * wrqu, char * extra) { struct iw_spy_data * spydata = get_spydata(dev); struct iw_thrspy * threshold = (struct iw_thrspy *) extra; /* Make sure driver is not buggy or using the old API */ if (!spydata) return -EOPNOTSUPP; /* Just do it */ memcpy(&(threshold->low), &(spydata->spy_thr_low), 2 * sizeof(struct iw_quality)); return 0; } EXPORT_SYMBOL(iw_handler_get_thrspy); /*------------------------------------------------------------------*/ /* * Prepare and send a Spy Threshold event */ static void iw_send_thrspy_event(struct net_device * dev, struct iw_spy_data * spydata, unsigned char * address, struct iw_quality * wstats) { union iwreq_data wrqu; struct iw_thrspy threshold; /* Init */ wrqu.data.length = 1; wrqu.data.flags = 0; /* Copy address */ memcpy(threshold.addr.sa_data, address, ETH_ALEN); threshold.addr.sa_family = ARPHRD_ETHER; /* Copy stats */ memcpy(&(threshold.qual), wstats, sizeof(struct iw_quality)); /* Copy also thresholds */ memcpy(&(threshold.low), &(spydata->spy_thr_low), 2 * sizeof(struct iw_quality)); /* Send event to user space */ wireless_send_event(dev, SIOCGIWTHRSPY, &wrqu, (char *) &threshold); } /* ---------------------------------------------------------------- */ /* * Call for the driver to update the spy data. * For now, the spy data is a simple array. As the size of the array is * small, this is good enough. If we wanted to support larger number of * spy addresses, we should use something more efficient... */ void wireless_spy_update(struct net_device * dev, unsigned char * address, struct iw_quality * wstats) { struct iw_spy_data * spydata = get_spydata(dev); int i; int match = -1; /* Make sure driver is not buggy or using the old API */ if (!spydata) return; /* Update all records that match */ for (i = 0; i < spydata->spy_number; i++) if (ether_addr_equal(address, spydata->spy_address[i])) { memcpy(&(spydata->spy_stat[i]), wstats, sizeof(struct iw_quality)); match = i; } /* Generate an event if we cross the spy threshold. * To avoid event storms, we have a simple hysteresis : we generate * event only when we go under the low threshold or above the * high threshold. */ if (match >= 0) { if (spydata->spy_thr_under[match]) { if (wstats->level > spydata->spy_thr_high.level) { spydata->spy_thr_under[match] = 0; iw_send_thrspy_event(dev, spydata, address, wstats); } } else { if (wstats->level < spydata->spy_thr_low.level) { spydata->spy_thr_under[match] = 1; iw_send_thrspy_event(dev, spydata, address, wstats); } } } } EXPORT_SYMBOL(wireless_spy_update); available on that particular CPU. Move the allocation to the CPU online callback and simplify the hotplug handling. At this point the package mapping is established and correct. This also adds a missing check for available package data in the event_init() function. Reported-by: Yasuaki Ishimatsu <yasu.isimatu@gmail.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Sebastian Siewior <bigeasy@linutronix.de> Cc: Stephane Eranian <eranian@google.com> Cc: Vince Weaver <vincent.weaver@maine.edu> Fixes: 9d85eb9119f4 ("x86/smpboot: Make logical package management more robust") Link: http://lkml.kernel.org/r/20170131230141.212593966@linutronix.de Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'net/tipc/server.c')