From: John Linville <linville@redhat.com> Date: Sun, 13 Dec 2009 16:55:07 -0500 Subject: [wireless] use internal regulatory database infrastructure Message-id: <20091213165507.GA2306@redhat.com> Patchwork-id: 21911 O-Subject: [RHEL5.5 urgent PATCH] wireless: use internal regulatory database infrastructure Bugzilla: 546712 RH-Acked-by: Neil Horman <nhorman@redhat.com> RH-Acked-by: Michal Schmidt <mschmidt@redhat.com> Infrastructure to support generation and use of internal regulatory database as an alternative to using CRDA (which is unavailable in RHEL5). This allows for better regulatory enforcement while maximizing functionality for customers. This is a backport of what I posted as an RFC for upstream this weekend. It would be best if this was available in RHEL5.5 during the Beta timeframe. BZ546712 net/wireless/Kconfig | 16 ++++++ net/wireless/Makefile | 6 ++ net/wireless/genregdb.awk | 105 ++++++++++++++++++++++++++++++++++++++++ net/wireless/reg.c | 119 ++++++++++++++++++++++++++++++++++++---------- net/wireless/regdb.h | 7 ++ 5 files changed, 229 insertions(+), 24 deletions(-) Signed-off-by: Don Zickus <dzickus@redhat.com> diff --git a/net/wireless/Kconfig b/net/wireless/Kconfig index 9f705a8..30f4cd8 100644 --- a/net/wireless/Kconfig +++ b/net/wireless/Kconfig @@ -33,6 +33,22 @@ config WIRELESS_OLD_REGULATORY Say N and if you say Y, please tell us why. The default is N. +config CFG80211_INTERNAL_REGDB + bool "Statically compiled regulatory rules database" + default n + depends on CFG80211 + ---help--- + This option generates an internal data structure representing + the wireless regulatory rules described in net/wireless/db.txt + and includes code to query that database. This is an alternative + to using CRDA for defining regulatory rules for the kernel. + + For details see: + + http://wireless.kernel.org/en/developers/Regulatory + + Most distributions have a CRDA package. So if unsure, say N. + config WIRELESS_EXT bool "Wireless extensions" default n diff --git a/net/wireless/Makefile b/net/wireless/Makefile index eec78cc..f5a902f 100644 --- a/net/wireless/Makefile +++ b/net/wireless/Makefile @@ -4,8 +4,14 @@ cfg80211-y += core.o sysfs.o radiotap.o util.o reg.o scan.o nl80211.o cfg80211-y += mlme.o ibss.o sme.o chan.o cfg80211-$(CONFIG_CFG80211_DEBUGFS) += debugfs.o cfg80211-$(CONFIG_WIRELESS_EXT) += wext-compat.o wext-sme.o +cfg80211-$(CONFIG_CFG80211_INTERNAL_REGDB) += regdb.o ccflags-y += -D__CHECK_ENDIAN__ wireless_compat-y += compat.o obj-$(CONFIG_WIRELESS_COMPAT) += wireless_compat.o + +$(obj)/regdb.c: $(src)/db.txt $(src)/genregdb.awk + @$(AWK) -f $(src)/genregdb.awk < $< > $@ + +clean-files := regdb.c diff --git a/net/wireless/genregdb.awk b/net/wireless/genregdb.awk new file mode 100644 index 0000000..89ec7f6 --- /dev/null +++ b/net/wireless/genregdb.awk @@ -0,0 +1,105 @@ +#!/usr/bin/awk -f +BEGIN { + active = 0 + rule = 0; + print "/*" + print " * DO NOT EDIT -- file generated from data in db.txt" + print " */" + print "" + print "#include <linux/nl80211.h>" + print "#include <net/cfg80211.h>" + print "" + regdb = "const struct ieee80211_regdomain *reg_regdb[] = {\n" +} + +/^[ \t]*#/ { + /* Ignore */ +} + +!active && /^[ \t]*$/ { + /* Ignore */ +} + +!active && /country/ { + country=$2 + sub(/:/, "", country) + printf "static const struct ieee80211_regdomain regdom_%s = {\n", country + printf "\t.alpha2 = \"%s\",\n", country + printf "\t.reg_rules = {\n" + active = 1 + regdb = regdb "\t®dom_" country ",\n" +} + +active && /^[ \t]*\(/ { + start = $1 + sub(/\(/, "", start) + end = $3 + bw = $5 + sub(/\),/, "", bw) + gain = $6 + sub(/\(/, "", gain) + sub(/,/, "", gain) + power = $7 + sub(/\)/, "", power) + sub(/,/, "", power) + # power might be in mW... + units = $8 + sub(/\)/, "", units) + sub(/,/, "", units) + if (units == "mW") { + if (power == 100) { + power = 20 + } else if (power == 200) { + power = 23 + } else if (power == 500) { + power = 27 + } else if (power == 1000) { + power = 30 + } else { + print "Unknown power value in database!" + } + } + flagstr = "" + for (i=8; i<=NF; i++) + flagstr = flagstr $i + split(flagstr, flagarray, ",") + flags = "" + for (arg in flagarray) { + if (flagarray[arg] == "NO-OFDM") { + flags = flags "\n\t\t\tNL80211_RRF_NO_OFDM | " + } else if (flagarray[arg] == "NO-CCK") { + flags = flags "\n\t\t\tNL80211_RRF_NO_CCK | " + } else if (flagarray[arg] == "NO-INDOOR") { + flags = flags "\n\t\t\tNL80211_RRF_NO_INDOOR | " + } else if (flagarray[arg] == "NO-OUTDOOR") { + flags = flags "\n\t\t\tNL80211_RRF_NO_OUTDOOR | " + } else if (flagarray[arg] == "DFS") { + flags = flags "\n\t\t\tNL80211_RRF_DFS | " + } else if (flagarray[arg] == "PTP-ONLY") { + flags = flags "\n\t\t\tNL80211_RRF_PTP_ONLY | " + } else if (flagarray[arg] == "PTMP-ONLY") { + flags = flags "\n\t\t\tNL80211_RRF_PTMP_ONLY | " + } else if (flagarray[arg] == "PASSIVE-SCAN") { + flags = flags "\n\t\t\tNL80211_RRF_PASSIVE_SCAN | " + } else if (flagarray[arg] == "NO-IBSS") { + flags = flags "\n\t\t\tNL80211_RRF_NO_IBSS | " + } + } + flags = flags "0" + printf "\t\tREG_RULE(%d, %d, %d, %d, %d, %s),\n", start, end, bw, gain, power, flags + rules++ +} + +active && /^[ \t]*$/ { + active = 0 + printf "\t},\n" + printf "\t.n_reg_rules = %d\n", rules + printf "};\n\n" + rules = 0; +} + +END { + print regdb "};" + print "" + print "int reg_regdb_size = ARRAY_SIZE(reg_regdb);" +} diff --git a/net/wireless/reg.c b/net/wireless/reg.c index 75b6de7..df6b1b9 100644 --- a/net/wireless/reg.c +++ b/net/wireless/reg.c @@ -40,6 +40,7 @@ #include <net/cfg80211.h> #include "core.h" #include "reg.h" +#include "regdb.h" #include "nl80211.h" /* Receipt of information from last regulatory request */ @@ -335,6 +336,98 @@ static bool country_ie_integrity_changes(u32 checksum) return false; } +static int reg_copy_regd(const struct ieee80211_regdomain **dst_regd, + const struct ieee80211_regdomain *src_regd) +{ + struct ieee80211_regdomain *regd; + int size_of_regd = 0; + unsigned int i; + + size_of_regd = sizeof(struct ieee80211_regdomain) + + ((src_regd->n_reg_rules + 1) * sizeof(struct ieee80211_reg_rule)); + + regd = kzalloc(size_of_regd, GFP_KERNEL); + if (!regd) + return -ENOMEM; + + memcpy(regd, src_regd, sizeof(struct ieee80211_regdomain)); + + for (i = 0; i < src_regd->n_reg_rules; i++) + memcpy(®d->reg_rules[i], &src_regd->reg_rules[i], + sizeof(struct ieee80211_reg_rule)); + + *dst_regd = regd; + return 0; +} + +#ifdef CONFIG_CFG80211_INTERNAL_REGDB +struct reg_regdb_search_request { + char alpha2[2]; + struct list_head list; +}; + +static LIST_HEAD(reg_regdb_search_list); +static DEFINE_SPINLOCK(reg_regdb_search_lock); + +static void reg_regdb_search(void *unused) +{ + struct reg_regdb_search_request *request; + const struct ieee80211_regdomain *curdom, *regdom; + int i, r; + + spin_lock(®_regdb_search_lock); + while (!list_empty(®_regdb_search_list)) { + request = list_first_entry(®_regdb_search_list, + struct reg_regdb_search_request, + list); + list_del(&request->list); + + for (i=0; i<reg_regdb_size; i++) { + curdom = reg_regdb[i]; + + if (!memcmp(request->alpha2, curdom->alpha2, 2)) { + r = reg_copy_regd(®dom, curdom); + if (r) + break; + spin_unlock(®_regdb_search_lock); + mutex_lock(&cfg80211_mutex); + set_regdom(regdom); + mutex_unlock(&cfg80211_mutex); + spin_lock(®_regdb_search_lock); + break; + } + } + + kfree(request); + } + spin_unlock(®_regdb_search_lock); +} + +static DECLARE_WORK(reg_regdb_work, reg_regdb_search, NULL); + +static void reg_regdb_query(const char *alpha2) +{ + struct reg_regdb_search_request *request; + + if (!alpha2) + return; + + request = kzalloc(sizeof(struct reg_regdb_search_request), GFP_KERNEL); + if (!request) + return; + + memcpy(request->alpha2, alpha2, 2); + + spin_lock(®_regdb_search_lock); + list_add_tail(&request->list, ®_regdb_search_list); + spin_unlock(®_regdb_search_lock); + + schedule_work(®_regdb_work); +} +#else +static inline void reg_regdb_query(const char *alpha2) {} +#endif /* CONFIG_CFG80211_INTERNAL_REGDB */ + /* * This lets us keep regulatory code which is updated on a regulatory * basis in userspace. @@ -354,6 +447,8 @@ static int call_crda(const char *alpha2) printk(KERN_INFO "cfg80211: Calling CRDA to update world " "regulatory domain\n"); + reg_regdb_query(alpha2); + country_env[8] = alpha2[0]; country_env[9] = alpha2[1]; @@ -1344,30 +1439,6 @@ void wiphy_apply_custom_regulatory(struct wiphy *wiphy, } EXPORT_SYMBOL(wiphy_apply_custom_regulatory); -static int reg_copy_regd(const struct ieee80211_regdomain **dst_regd, - const struct ieee80211_regdomain *src_regd) -{ - struct ieee80211_regdomain *regd; - int size_of_regd = 0; - unsigned int i; - - size_of_regd = sizeof(struct ieee80211_regdomain) + - ((src_regd->n_reg_rules + 1) * sizeof(struct ieee80211_reg_rule)); - - regd = kzalloc(size_of_regd, GFP_KERNEL); - if (!regd) - return -ENOMEM; - - memcpy(regd, src_regd, sizeof(struct ieee80211_regdomain)); - - for (i = 0; i < src_regd->n_reg_rules; i++) - memcpy(®d->reg_rules[i], &src_regd->reg_rules[i], - sizeof(struct ieee80211_reg_rule)); - - *dst_regd = regd; - return 0; -} - /* * Return value which can be used by ignore_request() to indicate * it has been determined we should intersect two regulatory domains diff --git a/net/wireless/regdb.h b/net/wireless/regdb.h new file mode 100644 index 0000000..818222c --- /dev/null +++ b/net/wireless/regdb.h @@ -0,0 +1,7 @@ +#ifndef __REGDB_H__ +#define __REGDB_H__ + +extern const struct ieee80211_regdomain *reg_regdb[]; +extern int reg_regdb_size; + +#endif /* __REGDB_H__ */