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TOMOYO Linux Cross Reference
Linux/include/net/ndisc.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 #ifndef _NDISC_H
  3 #define _NDISC_H
  4 
  5 /*
  6  *      ICMP codes for neighbour discovery messages
  7  */
  8 
  9 #define NDISC_ROUTER_SOLICITATION       133
 10 #define NDISC_ROUTER_ADVERTISEMENT      134
 11 #define NDISC_NEIGHBOUR_SOLICITATION    135
 12 #define NDISC_NEIGHBOUR_ADVERTISEMENT   136
 13 #define NDISC_REDIRECT                  137
 14 
 15 /*
 16  * Router type: cross-layer information from link-layer to
 17  * IPv6 layer reported by certain link types (e.g., RFC4214).
 18  */
 19 #define NDISC_NODETYPE_UNSPEC           0       /* unspecified (default) */
 20 #define NDISC_NODETYPE_HOST             1       /* host or unauthorized router */
 21 #define NDISC_NODETYPE_NODEFAULT        2       /* non-default router */
 22 #define NDISC_NODETYPE_DEFAULT          3       /* default router */
 23 
 24 /*
 25  *      ndisc options
 26  */
 27 
 28 enum {
 29         __ND_OPT_PREFIX_INFO_END = 0,
 30         ND_OPT_SOURCE_LL_ADDR = 1,      /* RFC2461 */
 31         ND_OPT_TARGET_LL_ADDR = 2,      /* RFC2461 */
 32         ND_OPT_PREFIX_INFO = 3,         /* RFC2461 */
 33         ND_OPT_REDIRECT_HDR = 4,        /* RFC2461 */
 34         ND_OPT_MTU = 5,                 /* RFC2461 */
 35         ND_OPT_NONCE = 14,              /* RFC7527 */
 36         __ND_OPT_ARRAY_MAX,
 37         ND_OPT_ROUTE_INFO = 24,         /* RFC4191 */
 38         ND_OPT_RDNSS = 25,              /* RFC5006 */
 39         ND_OPT_DNSSL = 31,              /* RFC6106 */
 40         ND_OPT_6CO = 34,                /* RFC6775 */
 41         __ND_OPT_MAX
 42 };
 43 
 44 #define MAX_RTR_SOLICITATION_DELAY      HZ
 45 
 46 #define ND_REACHABLE_TIME               (30*HZ)
 47 #define ND_RETRANS_TIMER                HZ
 48 
 49 #include <linux/compiler.h>
 50 #include <linux/icmpv6.h>
 51 #include <linux/in6.h>
 52 #include <linux/types.h>
 53 #include <linux/if_arp.h>
 54 #include <linux/netdevice.h>
 55 #include <linux/hash.h>
 56 
 57 #include <net/neighbour.h>
 58 
 59 /* Set to 3 to get tracing... */
 60 #define ND_DEBUG 1
 61 
 62 #define ND_PRINTK(val, level, fmt, ...)                         \
 63 do {                                                            \
 64         if (val <= ND_DEBUG)                                    \
 65                 net_##level##_ratelimited(fmt, ##__VA_ARGS__);  \
 66 } while (0)
 67 
 68 struct ctl_table;
 69 struct inet6_dev;
 70 struct net_device;
 71 struct net_proto_family;
 72 struct sk_buff;
 73 struct prefix_info;
 74 
 75 extern struct neigh_table nd_tbl;
 76 
 77 struct nd_msg {
 78         struct icmp6hdr icmph;
 79         struct in6_addr target;
 80         __u8            opt[0];
 81 };
 82 
 83 struct rs_msg {
 84         struct icmp6hdr icmph;
 85         __u8            opt[0];
 86 };
 87 
 88 struct ra_msg {
 89         struct icmp6hdr         icmph;
 90         __be32                  reachable_time;
 91         __be32                  retrans_timer;
 92 };
 93 
 94 struct rd_msg {
 95         struct icmp6hdr icmph;
 96         struct in6_addr target;
 97         struct in6_addr dest;
 98         __u8            opt[0];
 99 };
100 
101 struct nd_opt_hdr {
102         __u8            nd_opt_type;
103         __u8            nd_opt_len;
104 } __packed;
105 
106 /* ND options */
107 struct ndisc_options {
108         struct nd_opt_hdr *nd_opt_array[__ND_OPT_ARRAY_MAX];
109 #ifdef CONFIG_IPV6_ROUTE_INFO
110         struct nd_opt_hdr *nd_opts_ri;
111         struct nd_opt_hdr *nd_opts_ri_end;
112 #endif
113         struct nd_opt_hdr *nd_useropts;
114         struct nd_opt_hdr *nd_useropts_end;
115 #if IS_ENABLED(CONFIG_IEEE802154_6LOWPAN)
116         struct nd_opt_hdr *nd_802154_opt_array[ND_OPT_TARGET_LL_ADDR + 1];
117 #endif
118 };
119 
120 #define nd_opts_src_lladdr              nd_opt_array[ND_OPT_SOURCE_LL_ADDR]
121 #define nd_opts_tgt_lladdr              nd_opt_array[ND_OPT_TARGET_LL_ADDR]
122 #define nd_opts_pi                      nd_opt_array[ND_OPT_PREFIX_INFO]
123 #define nd_opts_pi_end                  nd_opt_array[__ND_OPT_PREFIX_INFO_END]
124 #define nd_opts_rh                      nd_opt_array[ND_OPT_REDIRECT_HDR]
125 #define nd_opts_mtu                     nd_opt_array[ND_OPT_MTU]
126 #define nd_opts_nonce                   nd_opt_array[ND_OPT_NONCE]
127 #define nd_802154_opts_src_lladdr       nd_802154_opt_array[ND_OPT_SOURCE_LL_ADDR]
128 #define nd_802154_opts_tgt_lladdr       nd_802154_opt_array[ND_OPT_TARGET_LL_ADDR]
129 
130 #define NDISC_OPT_SPACE(len) (((len)+2+7)&~7)
131 
132 struct ndisc_options *ndisc_parse_options(const struct net_device *dev,
133                                           u8 *opt, int opt_len,
134                                           struct ndisc_options *ndopts);
135 
136 void __ndisc_fill_addr_option(struct sk_buff *skb, int type, void *data,
137                               int data_len, int pad);
138 
139 #define NDISC_OPS_REDIRECT_DATA_SPACE   2
140 
141 /*
142  * This structure defines the hooks for IPv6 neighbour discovery.
143  * The following hooks can be defined; unless noted otherwise, they are
144  * optional and can be filled with a null pointer.
145  *
146  * int (*is_useropt)(u8 nd_opt_type):
147  *     This function is called when IPv6 decide RA userspace options. if
148  *     this function returns 1 then the option given by nd_opt_type will
149  *     be handled as userspace option additional to the IPv6 options.
150  *
151  * int (*parse_options)(const struct net_device *dev,
152  *                      struct nd_opt_hdr *nd_opt,
153  *                      struct ndisc_options *ndopts):
154  *     This function is called while parsing ndisc ops and put each position
155  *     as pointer into ndopts. If this function return unequal 0, then this
156  *     function took care about the ndisc option, if 0 then the IPv6 ndisc
157  *     option parser will take care about that option.
158  *
159  * void (*update)(const struct net_device *dev, struct neighbour *n,
160  *                u32 flags, u8 icmp6_type,
161  *                const struct ndisc_options *ndopts):
162  *     This function is called when IPv6 ndisc updates the neighbour cache
163  *     entry. Additional options which can be updated may be previously
164  *     parsed by parse_opts callback and accessible over ndopts parameter.
165  *
166  * int (*opt_addr_space)(const struct net_device *dev, u8 icmp6_type,
167  *                       struct neighbour *neigh, u8 *ha_buf,
168  *                       u8 **ha):
169  *     This function is called when the necessary option space will be
170  *     calculated before allocating a skb. The parameters neigh, ha_buf
171  *     abd ha are available on NDISC_REDIRECT messages only.
172  *
173  * void (*fill_addr_option)(const struct net_device *dev,
174  *                          struct sk_buff *skb, u8 icmp6_type,
175  *                          const u8 *ha):
176  *     This function is called when the skb will finally fill the option
177  *     fields inside skb. NOTE: this callback should fill the option
178  *     fields to the skb which are previously indicated by opt_space
179  *     parameter. That means the decision to add such option should
180  *     not lost between these two callbacks, e.g. protected by interface
181  *     up state.
182  *
183  * void (*prefix_rcv_add_addr)(struct net *net, struct net_device *dev,
184  *                             const struct prefix_info *pinfo,
185  *                             struct inet6_dev *in6_dev,
186  *                             struct in6_addr *addr,
187  *                             int addr_type, u32 addr_flags,
188  *                             bool sllao, bool tokenized,
189  *                             __u32 valid_lft, u32 prefered_lft,
190  *                             bool dev_addr_generated):
191  *     This function is called when a RA messages is received with valid
192  *     PIO option fields and an IPv6 address will be added to the interface
193  *     for autoconfiguration. The parameter dev_addr_generated reports about
194  *     if the address was based on dev->dev_addr or not. This can be used
195  *     to add a second address if link-layer operates with two link layer
196  *     addresses. E.g. 802.15.4 6LoWPAN.
197  */
198 struct ndisc_ops {
199         int     (*is_useropt)(u8 nd_opt_type);
200         int     (*parse_options)(const struct net_device *dev,
201                                  struct nd_opt_hdr *nd_opt,
202                                  struct ndisc_options *ndopts);
203         void    (*update)(const struct net_device *dev, struct neighbour *n,
204                           u32 flags, u8 icmp6_type,
205                           const struct ndisc_options *ndopts);
206         int     (*opt_addr_space)(const struct net_device *dev, u8 icmp6_type,
207                                   struct neighbour *neigh, u8 *ha_buf,
208                                   u8 **ha);
209         void    (*fill_addr_option)(const struct net_device *dev,
210                                     struct sk_buff *skb, u8 icmp6_type,
211                                     const u8 *ha);
212         void    (*prefix_rcv_add_addr)(struct net *net, struct net_device *dev,
213                                        const struct prefix_info *pinfo,
214                                        struct inet6_dev *in6_dev,
215                                        struct in6_addr *addr,
216                                        int addr_type, u32 addr_flags,
217                                        bool sllao, bool tokenized,
218                                        __u32 valid_lft, u32 prefered_lft,
219                                        bool dev_addr_generated);
220 };
221 
222 #if IS_ENABLED(CONFIG_IPV6)
223 static inline int ndisc_ops_is_useropt(const struct net_device *dev,
224                                        u8 nd_opt_type)
225 {
226         if (dev->ndisc_ops && dev->ndisc_ops->is_useropt)
227                 return dev->ndisc_ops->is_useropt(nd_opt_type);
228         else
229                 return 0;
230 }
231 
232 static inline int ndisc_ops_parse_options(const struct net_device *dev,
233                                           struct nd_opt_hdr *nd_opt,
234                                           struct ndisc_options *ndopts)
235 {
236         if (dev->ndisc_ops && dev->ndisc_ops->parse_options)
237                 return dev->ndisc_ops->parse_options(dev, nd_opt, ndopts);
238         else
239                 return 0;
240 }
241 
242 static inline void ndisc_ops_update(const struct net_device *dev,
243                                           struct neighbour *n, u32 flags,
244                                           u8 icmp6_type,
245                                           const struct ndisc_options *ndopts)
246 {
247         if (dev->ndisc_ops && dev->ndisc_ops->update)
248                 dev->ndisc_ops->update(dev, n, flags, icmp6_type, ndopts);
249 }
250 
251 static inline int ndisc_ops_opt_addr_space(const struct net_device *dev,
252                                            u8 icmp6_type)
253 {
254         if (dev->ndisc_ops && dev->ndisc_ops->opt_addr_space &&
255             icmp6_type != NDISC_REDIRECT)
256                 return dev->ndisc_ops->opt_addr_space(dev, icmp6_type, NULL,
257                                                       NULL, NULL);
258         else
259                 return 0;
260 }
261 
262 static inline int ndisc_ops_redirect_opt_addr_space(const struct net_device *dev,
263                                                     struct neighbour *neigh,
264                                                     u8 *ha_buf, u8 **ha)
265 {
266         if (dev->ndisc_ops && dev->ndisc_ops->opt_addr_space)
267                 return dev->ndisc_ops->opt_addr_space(dev, NDISC_REDIRECT,
268                                                       neigh, ha_buf, ha);
269         else
270                 return 0;
271 }
272 
273 static inline void ndisc_ops_fill_addr_option(const struct net_device *dev,
274                                               struct sk_buff *skb,
275                                               u8 icmp6_type)
276 {
277         if (dev->ndisc_ops && dev->ndisc_ops->fill_addr_option &&
278             icmp6_type != NDISC_REDIRECT)
279                 dev->ndisc_ops->fill_addr_option(dev, skb, icmp6_type, NULL);
280 }
281 
282 static inline void ndisc_ops_fill_redirect_addr_option(const struct net_device *dev,
283                                                        struct sk_buff *skb,
284                                                        const u8 *ha)
285 {
286         if (dev->ndisc_ops && dev->ndisc_ops->fill_addr_option)
287                 dev->ndisc_ops->fill_addr_option(dev, skb, NDISC_REDIRECT, ha);
288 }
289 
290 static inline void ndisc_ops_prefix_rcv_add_addr(struct net *net,
291                                                  struct net_device *dev,
292                                                  const struct prefix_info *pinfo,
293                                                  struct inet6_dev *in6_dev,
294                                                  struct in6_addr *addr,
295                                                  int addr_type, u32 addr_flags,
296                                                  bool sllao, bool tokenized,
297                                                  __u32 valid_lft,
298                                                  u32 prefered_lft,
299                                                  bool dev_addr_generated)
300 {
301         if (dev->ndisc_ops && dev->ndisc_ops->prefix_rcv_add_addr)
302                 dev->ndisc_ops->prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
303                                                     addr, addr_type,
304                                                     addr_flags, sllao,
305                                                     tokenized, valid_lft,
306                                                     prefered_lft,
307                                                     dev_addr_generated);
308 }
309 #endif
310 
311 /*
312  * Return the padding between the option length and the start of the
313  * link addr.  Currently only IP-over-InfiniBand needs this, although
314  * if RFC 3831 IPv6-over-Fibre Channel is ever implemented it may
315  * also need a pad of 2.
316  */
317 static inline int ndisc_addr_option_pad(unsigned short type)
318 {
319         switch (type) {
320         case ARPHRD_INFINIBAND: return 2;
321         default:                return 0;
322         }
323 }
324 
325 static inline int __ndisc_opt_addr_space(unsigned char addr_len, int pad)
326 {
327         return NDISC_OPT_SPACE(addr_len + pad);
328 }
329 
330 #if IS_ENABLED(CONFIG_IPV6)
331 static inline int ndisc_opt_addr_space(struct net_device *dev, u8 icmp6_type)
332 {
333         return __ndisc_opt_addr_space(dev->addr_len,
334                                       ndisc_addr_option_pad(dev->type)) +
335                 ndisc_ops_opt_addr_space(dev, icmp6_type);
336 }
337 
338 static inline int ndisc_redirect_opt_addr_space(struct net_device *dev,
339                                                 struct neighbour *neigh,
340                                                 u8 *ops_data_buf,
341                                                 u8 **ops_data)
342 {
343         return __ndisc_opt_addr_space(dev->addr_len,
344                                       ndisc_addr_option_pad(dev->type)) +
345                 ndisc_ops_redirect_opt_addr_space(dev, neigh, ops_data_buf,
346                                                   ops_data);
347 }
348 #endif
349 
350 static inline u8 *__ndisc_opt_addr_data(struct nd_opt_hdr *p,
351                                         unsigned char addr_len, int prepad)
352 {
353         u8 *lladdr = (u8 *)(p + 1);
354         int lladdrlen = p->nd_opt_len << 3;
355         if (lladdrlen != __ndisc_opt_addr_space(addr_len, prepad))
356                 return NULL;
357         return lladdr + prepad;
358 }
359 
360 static inline u8 *ndisc_opt_addr_data(struct nd_opt_hdr *p,
361                                       struct net_device *dev)
362 {
363         return __ndisc_opt_addr_data(p, dev->addr_len,
364                                      ndisc_addr_option_pad(dev->type));
365 }
366 
367 static inline u32 ndisc_hashfn(const void *pkey, const struct net_device *dev, __u32 *hash_rnd)
368 {
369         const u32 *p32 = pkey;
370 
371         return (((p32[0] ^ hash32_ptr(dev)) * hash_rnd[0]) +
372                 (p32[1] * hash_rnd[1]) +
373                 (p32[2] * hash_rnd[2]) +
374                 (p32[3] * hash_rnd[3]));
375 }
376 
377 static inline struct neighbour *__ipv6_neigh_lookup_noref(struct net_device *dev, const void *pkey)
378 {
379         return ___neigh_lookup_noref(&nd_tbl, neigh_key_eq128, ndisc_hashfn, pkey, dev);
380 }
381 
382 static inline struct neighbour *__ipv6_neigh_lookup(struct net_device *dev, const void *pkey)
383 {
384         struct neighbour *n;
385 
386         rcu_read_lock_bh();
387         n = __ipv6_neigh_lookup_noref(dev, pkey);
388         if (n && !refcount_inc_not_zero(&n->refcnt))
389                 n = NULL;
390         rcu_read_unlock_bh();
391 
392         return n;
393 }
394 
395 static inline void __ipv6_confirm_neigh(struct net_device *dev,
396                                         const void *pkey)
397 {
398         struct neighbour *n;
399 
400         rcu_read_lock_bh();
401         n = __ipv6_neigh_lookup_noref(dev, pkey);
402         if (n) {
403                 unsigned long now = jiffies;
404 
405                 /* avoid dirtying neighbour */
406                 if (n->confirmed != now)
407                         n->confirmed = now;
408         }
409         rcu_read_unlock_bh();
410 }
411 
412 int ndisc_init(void);
413 int ndisc_late_init(void);
414 
415 void ndisc_late_cleanup(void);
416 void ndisc_cleanup(void);
417 
418 int ndisc_rcv(struct sk_buff *skb);
419 
420 void ndisc_send_ns(struct net_device *dev, const struct in6_addr *solicit,
421                    const struct in6_addr *daddr, const struct in6_addr *saddr,
422                    u64 nonce);
423 
424 void ndisc_send_rs(struct net_device *dev,
425                    const struct in6_addr *saddr, const struct in6_addr *daddr);
426 void ndisc_send_na(struct net_device *dev, const struct in6_addr *daddr,
427                    const struct in6_addr *solicited_addr,
428                    bool router, bool solicited, bool override, bool inc_opt);
429 
430 void ndisc_send_redirect(struct sk_buff *skb, const struct in6_addr *target);
431 
432 int ndisc_mc_map(const struct in6_addr *addr, char *buf, struct net_device *dev,
433                  int dir);
434 
435 void ndisc_update(const struct net_device *dev, struct neighbour *neigh,
436                   const u8 *lladdr, u8 new, u32 flags, u8 icmp6_type,
437                   struct ndisc_options *ndopts);
438 
439 /*
440  *      IGMP
441  */
442 int igmp6_init(void);
443 int igmp6_late_init(void);
444 
445 void igmp6_cleanup(void);
446 void igmp6_late_cleanup(void);
447 
448 int igmp6_event_query(struct sk_buff *skb);
449 
450 int igmp6_event_report(struct sk_buff *skb);
451 
452 
453 #ifdef CONFIG_SYSCTL
454 int ndisc_ifinfo_sysctl_change(struct ctl_table *ctl, int write,
455                                void __user *buffer, size_t *lenp, loff_t *ppos);
456 int ndisc_ifinfo_sysctl_strategy(struct ctl_table *ctl,
457                                  void __user *oldval, size_t __user *oldlenp,
458                                  void __user *newval, size_t newlen);
459 #endif
460 
461 void inet6_ifinfo_notify(int event, struct inet6_dev *idev);
462 
463 #endif
464 

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