batman-adv/src/compat-hacks.h

   1 /* Please avoid adding hacks here - instead add it to mac80211/backports.git */
   2
   3 #undef CONFIG_MODULE_STRIPPED
   4
   5 #include <linux/version.h>      /* LINUX_VERSION_CODE */
   6 #include <linux/types.h>
   7
   8 #if LINUX_VERSION_CODE < KERNEL_VERSION(4, 1, 0)
   9
  10 #define dev_get_iflink(_net_dev) ((_net_dev)->iflink)
  11
  12 #endif /* < KERNEL_VERSION(4, 1, 0) */
  13
  14 #if LINUX_VERSION_CODE < KERNEL_VERSION(4, 5, 0)
  15
  16 #include <linux/netdevice.h>
  17
  18 #define netdev_master_upper_dev_link(dev, upper_dev, upper_priv, upper_info, extack) ({\
  19         BUILD_BUG_ON(upper_priv != NULL); \
  20         BUILD_BUG_ON(upper_info != NULL); \
  21         BUILD_BUG_ON(extack != NULL); \
  22         netdev_master_upper_dev_link(dev, upper_dev); \
  23 })
  24
  25 #elif LINUX_VERSION_CODE < KERNEL_VERSION(4, 15, 0)
  26
  27 #include <linux/netdevice.h>
  28
  29 #define netdev_master_upper_dev_link(dev, upper_dev, upper_priv, upper_info, extack) ({\
  30         BUILD_BUG_ON(extack != NULL); \
  31         netdev_master_upper_dev_link(dev, upper_dev, upper_priv, upper_info); \
  32 })
  33
  34 #endif /* < KERNEL_VERSION(4, 5, 0) */
  35
  36
  37 #if LINUX_VERSION_CODE < KERNEL_VERSION(4, 0, 0)
  38
  39 /* wild hack for batadv_getlink_net only */
  40 #define get_link_net get_xstats_size || 1 ? fallback_net : (struct net*)netdev->rtnl_link_ops->get_xstats_size
  41
  42 #endif /* < KERNEL_VERSION(4, 0, 0) */
  43
  44
  45 #if LINUX_VERSION_CODE < KERNEL_VERSION(4, 2, 0)
  46
  47 struct sk_buff *skb_checksum_trimmed(struct sk_buff *skb,
  48                                      unsigned int transport_len,
  49                                      __sum16(*skb_chkf)(struct sk_buff *skb));
  50
  51 int ip_mc_check_igmp(struct sk_buff *skb, struct sk_buff **skb_trimmed);
  52
  53 int ipv6_mc_check_mld(struct sk_buff *skb, struct sk_buff **skb_trimmed);
  54
  55 #endif /* < KERNEL_VERSION(4, 2, 0) */
  56
  57 #if LINUX_VERSION_CODE < KERNEL_VERSION(4, 3, 0)
  58
  59 #define IFF_NO_QUEUE    0; dev->tx_queue_len = 0
  60
  61 static inline bool hlist_fake(struct hlist_node *h)
  62 {
  63         return h->pprev == &h->next;
  64 }
  65
  66 #endif /* < KERNEL_VERSION(4, 3, 0) */
  67
  68 #if LINUX_VERSION_CODE < KERNEL_VERSION(4, 6, 0)
  69
  70 #include <linux/ethtool.h>
  71
  72 #define ethtool_link_ksettings batadv_ethtool_link_ksettings
  73
  74 struct batadv_ethtool_link_ksettings {
  75         struct {
  76                 __u32   speed;
  77                 __u8    duplex;
  78                 __u8    autoneg;
  79         } base;
  80 };
  81
  82 #define __ethtool_get_link_ksettings(__dev, __link_settings) \
  83         batadv_ethtool_get_link_ksettings(__dev, __link_settings)
  84
  85 static inline int
  86 batadv_ethtool_get_link_ksettings(struct net_device *dev,
  87                                   struct ethtool_link_ksettings *link_ksettings)
  88 {
  89         struct ethtool_cmd cmd;
  90         int ret;
  91
  92         memset(&cmd, 0, sizeof(cmd));
  93         ret = __ethtool_get_settings(dev, &cmd);
  94
  95         if (ret != 0)
  96                 return ret;
  97
  98         link_ksettings->base.duplex = cmd.duplex;
  99         link_ksettings->base.speed = ethtool_cmd_speed(&cmd);
 100         link_ksettings->base.autoneg = cmd.autoneg;
 101
 102         return 0;
 103 }
 104
 105 #endif /* < KERNEL_VERSION(4, 6, 0) */
 106
 107 #if LINUX_VERSION_CODE < KERNEL_VERSION(4, 7, 0)
 108
 109 #ifdef netif_trans_update
 110 #undef netif_trans_update
 111 #endif
 112
 113 #define netif_trans_update batadv_netif_trans_update
 114 static inline void batadv_netif_trans_update(struct net_device *dev)
 115 {
 116         dev->trans_start = jiffies;
 117 }
 118
 119 #endif /* < KERNEL_VERSION(4, 7, 0) */
 120
 121
 122 #include_next <linux/netlink.h>
 123
 124 #if LINUX_VERSION_CODE < KERNEL_VERSION(4, 7, 0)
 125
 126 #include_next <net/netlink.h>
 127
 128 static inline bool batadv_nla_need_padding_for_64bit(struct sk_buff *skb);
 129
 130 static inline int batadv_nla_align_64bit(struct sk_buff *skb, int padattr)
 131 {
 132         if (batadv_nla_need_padding_for_64bit(skb) &&
 133             !nla_reserve(skb, padattr, 0))
 134                 return -EMSGSIZE;
 135
 136         return 0;
 137 }
 138
 139 static inline struct nlattr *batadv__nla_reserve_64bit(struct sk_buff *skb,
 140                                                        int attrtype,
 141                                                        int attrlen, int padattr)
 142 {
 143         if (batadv_nla_need_padding_for_64bit(skb))
 144                 batadv_nla_align_64bit(skb, padattr);
 145
 146         return __nla_reserve(skb, attrtype, attrlen);
 147 }
 148
 149 static inline void batadv__nla_put_64bit(struct sk_buff *skb, int attrtype,
 150                                          int attrlen, const void *data,
 151                                          int padattr)
 152 {
 153         struct nlattr *nla;
 154
 155         nla = batadv__nla_reserve_64bit(skb, attrtype, attrlen, padattr);
 156         memcpy(nla_data(nla), data, attrlen);
 157 }
 158
 159 static inline bool batadv_nla_need_padding_for_64bit(struct sk_buff *skb)
 160 {
 161 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
 162         /* The nlattr header is 4 bytes in size, that's why we test
 163          * if the skb->data _is_ aligned.  A NOP attribute, plus
 164          * nlattr header for next attribute, will make nla_data()
 165          * 8-byte aligned.
 166          */
 167         if (IS_ALIGNED((unsigned long)skb_tail_pointer(skb), 8))
 168                 return true;
 169 #endif
 170         return false;
 171 }
 172
 173 static inline int batadv_nla_total_size_64bit(int payload)
 174 {
 175         return NLA_ALIGN(nla_attr_size(payload))
 176 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
 177                 + NLA_ALIGN(nla_attr_size(0))
 178 #endif
 179                 ;
 180 }
 181
 182 static inline int batadv_nla_put_64bit(struct sk_buff *skb, int attrtype,
 183                                        int attrlen, const void *data,
 184                                        int padattr)
 185 {
 186         size_t len;
 187
 188         if (batadv_nla_need_padding_for_64bit(skb))
 189                 len = batadv_nla_total_size_64bit(attrlen);
 190         else
 191                 len = nla_total_size(attrlen);
 192         if (unlikely(skb_tailroom(skb) < len))
 193                 return -EMSGSIZE;
 194
 195         batadv__nla_put_64bit(skb, attrtype, attrlen, data, padattr);
 196         return 0;
 197 }
 198
 199 #ifdef nla_put_u64_64bit
 200 #undef nla_put_u64_64bit
 201 #endif
 202
 203 #define nla_put_u64_64bit(_skb, _attrtype, _value, _padattr) \
 204         batadv_nla_put_u64_64bit(_skb, _attrtype, _value, _padattr)
 205 static inline int batadv_nla_put_u64_64bit(struct sk_buff *skb, int attrtype,
 206                                            u64 value, int padattr)
 207 {
 208         return batadv_nla_put_64bit(skb, attrtype, sizeof(u64), &value,
 209                                     padattr);
 210 }
 211
 212 #endif /* < KERNEL_VERSION(4, 7, 0) */
 213
 214
 215 #if LINUX_VERSION_CODE < KERNEL_VERSION(4, 10, 0)
 216
 217 #include_next <linux/cache.h>
 218
 219 /* hack for netlink.c which marked the family ops as ro */
 220 #ifdef __ro_after_init
 221 #undef __ro_after_init
 222 #endif
 223 #define __ro_after_init
 224
 225 #endif /* < KERNEL_VERSION(4, 10, 0) */
 226
 227 #if LINUX_VERSION_CODE < KERNEL_VERSION(4, 11, 9)
 228
 229 #include <linux/netdevice.h>
 230
 231 /* work around missing attribute needs_free_netdev and priv_destructor in
 232  * net_device
 233  */
 234 #define ether_setup(dev) \
 235         void batadv_softif_free2(struct net_device *dev) \
 236         { \
 237                 batadv_softif_free(dev); \
 238                 free_netdev(dev); \
 239         } \
 240         void (*t1)(struct net_device *dev) __attribute__((unused)); \
 241         bool t2 __attribute__((unused)); \
 242         ether_setup(dev)
 243 #define needs_free_netdev destructor = batadv_softif_free2; t2
 244 #define priv_destructor destructor = batadv_softif_free2; t1
 245
 246 #endif /* < KERNEL_VERSION(4, 11, 9) */
 247
 248 #if LINUX_VERSION_CODE < KERNEL_VERSION(4, 13, 0)
 249
 250 static inline void *batadv_skb_put(struct sk_buff *skb, unsigned int len)
 251 {
 252         return (void *)skb_put(skb, len);
 253 }
 254 #ifdef skb_put
 255 #undef skb_put
 256 #endif
 257
 258 #define skb_put batadv_skb_put
 259
 260 static inline void *batadv_skb_put_zero(struct sk_buff *skb, unsigned int len)
 261 {
 262         void *tmp = skb_put(skb, len);
 263
 264         memset(tmp, 0, len);
 265
 266         return tmp;
 267 }
 268 #ifdef skb_put_zero
 269 #undef skb_put_zero
 270 #endif
 271
 272 #define skb_put_zero batadv_skb_put_zero
 273
 274 static inline void *batadv_skb_put_data(struct sk_buff *skb, const void *data,
 275                                  unsigned int len)
 276 {
 277         void *tmp = skb_put(skb, len);
 278
 279         memcpy(tmp, data, len);
 280
 281         return tmp;
 282 }
 283 #ifdef skb_put_data
 284 #undef skb_put_data
 285 #endif
 286
 287 #define skb_put_data batadv_skb_put_data
 288
 289 #endif /* < KERNEL_VERSION(4, 13, 0) */
 290
 291 #if LINUX_VERSION_CODE < KERNEL_VERSION(4, 15, 0)
 292
 293 #define batadv_softif_slave_add(__dev, __slave_dev, __extack) \
 294         batadv_softif_slave_add(__dev, __slave_dev)
 295
 296 #endif /* < KERNEL_VERSION(4, 15, 0) */
 297
 298 #ifndef from_timer
 299
 300 #define TIMER_DATA_TYPE                unsigned long
 301 #define TIMER_FUNC_TYPE                void (*)(TIMER_DATA_TYPE)
 302
 303 static inline void timer_setup(struct timer_list *timer,
 304                                void (*callback)(struct timer_list *),
 305                                unsigned int flags)
 306 {
 307         __setup_timer(timer, (TIMER_FUNC_TYPE)callback,
 308                       (TIMER_DATA_TYPE)timer, flags);
 309 }
 310
 311 #define from_timer(var, callback_timer, timer_fieldname) \
 312         container_of(callback_timer, typeof(*var), timer_fieldname)
 313
 314 #endif /* !from_timer */
 315
 316 #if LINUX_VERSION_CODE < KERNEL_VERSION(4, 16, 0)
 317
 318
 319 #if LINUX_VERSION_CODE < KERNEL_VERSION(4, 18, 0)
 320
 321 #include <net/cfg80211.h>
 322
 323 /* cfg80211 fix: https://patchwork.kernel.org/patch/10449857/ */
 324 static inline int batadv_cfg80211_get_station(struct net_device *dev,
 325                                               const u8 *mac_addr,
 326                                               struct station_info *sinfo)
 327 {
 328         memset(sinfo, 0, sizeof(*sinfo));
 329         return cfg80211_get_station(dev, mac_addr, sinfo);
 330 }
 331
 332 #define cfg80211_get_station(dev, mac_addr, sinfo) \
 333         batadv_cfg80211_get_station(dev, mac_addr, sinfo)
 334
 335 #endif /* < KERNEL_VERSION(4, 18, 0) */
 336
 337
 338 #ifdef __CHECK_POLL
 339 typedef unsigned __bitwise __poll_t;
 340 #else
 341 typedef unsigned __poll_t;
 342 #endif
 343
 344 #endif /* < KERNEL_VERSION(4, 16, 0) */
 345
 346 #if LINUX_VERSION_CODE < KERNEL_VERSION(5, 0, 0)
 347
 348 static inline int batadv_access_ok(int type, const void __user *p,
 349                                    unsigned long size)
 350 {
 351         return access_ok(type, p, size);
 352 }
 353
 354 #ifdef access_ok
 355 #undef access_ok
 356 #endif
 357
 358 #define access_ok_get(_1, _2, _3 , access_ok_name, ...) access_ok_name
 359 #define access_ok(...) \
 360         access_ok_get(__VA_ARGS__, access_ok3, access_ok2)(__VA_ARGS__)
 361
 362 #define access_ok2(addr, size)  batadv_access_ok(VERIFY_WRITE, (addr), (size))
 363 #define access_ok3(type, addr, size)    batadv_access_ok((type), (addr), (size))
 364
 365 #endif /* < KERNEL_VERSION(5, 0, 0) */
 366
 367 /* <DECLARE_EWMA> */
 368
 369 #include <linux/version.h>
 370 #include_next <linux/average.h>
 371
 372 #include <linux/bug.h>
 373
 374 #ifdef DECLARE_EWMA
 375 #undef DECLARE_EWMA
 376 #endif /* DECLARE_EWMA */
 377
 378 /*
 379  * Exponentially weighted moving average (EWMA)
 380  *
 381  * This implements a fixed-precision EWMA algorithm, with both the
 382  * precision and fall-off coefficient determined at compile-time
 383  * and built into the generated helper funtions.
 384  *
 385  * The first argument to the macro is the name that will be used
 386  * for the struct and helper functions.
 387  *
 388  * The second argument, the precision, expresses how many bits are
 389  * used for the fractional part of the fixed-precision values.
 390  *
 391  * The third argument, the weight reciprocal, determines how the
 392  * new values will be weighed vs. the old state, new values will
 393  * get weight 1/weight_rcp and old values 1-1/weight_rcp. Note
 394  * that this parameter must be a power of two for efficiency.
 395  */
 396
 397 #define DECLARE_EWMA(name, _precision, _weight_rcp)                     \
 398         struct ewma_##name {                                            \
 399                 unsigned long internal;                                 \
 400         };                                                              \
 401         static inline void ewma_##name##_init(struct ewma_##name *e)    \
 402         {                                                               \
 403                 BUILD_BUG_ON(!__builtin_constant_p(_precision));        \
 404                 BUILD_BUG_ON(!__builtin_constant_p(_weight_rcp));       \
 405                 /*                                                      \
 406                  * Even if you want to feed it just 0/1 you should have \
 407                  * some bits for the non-fractional part...             \
 408                  */                                                     \
 409                 BUILD_BUG_ON((_precision) > 30);                        \
 410                 BUILD_BUG_ON_NOT_POWER_OF_2(_weight_rcp);               \
 411                 e->internal = 0;                                        \
 412         }                                                               \
 413         static inline unsigned long                                     \
 414         ewma_##name##_read(struct ewma_##name *e)                       \
 415         {                                                               \
 416                 BUILD_BUG_ON(!__builtin_constant_p(_precision));        \
 417                 BUILD_BUG_ON(!__builtin_constant_p(_weight_rcp));       \
 418                 BUILD_BUG_ON((_precision) > 30);                        \
 419                 BUILD_BUG_ON_NOT_POWER_OF_2(_weight_rcp);               \
 420                 return e->internal >> (_precision);                     \
 421         }                                                               \
 422         static inline void ewma_##name##_add(struct ewma_##name *e,     \
 423                                              unsigned long val)         \
 424         {                                                               \
 425                 unsigned long internal = READ_ONCE(e->internal);        \
 426                 unsigned long weight_rcp = ilog2(_weight_rcp);          \
 427                 unsigned long precision = _precision;                   \
 428                                                                         \
 429                 BUILD_BUG_ON(!__builtin_constant_p(_precision));        \
 430                 BUILD_BUG_ON(!__builtin_constant_p(_weight_rcp));       \
 431                 BUILD_BUG_ON((_precision) > 30);                        \
 432                 BUILD_BUG_ON_NOT_POWER_OF_2(_weight_rcp);               \
 433                                                                         \
 434                 WRITE_ONCE(e->internal, internal ?                      \
 435                         (((internal << weight_rcp) - internal) +        \
 436                                 (val << precision)) >> weight_rcp :     \
 437                         (val << precision));                            \
 438         }
 439
 440 /* </DECLARE_EWMA> */