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Linux/include/net/ndisc.h

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

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