include/linux/ipv6.h

   1 #ifndef _IPV6_H
   2 #define _IPV6_H
   3
   4 #include <uapi/linux/ipv6.h>
   5
   6 #define ipv6_optlen(p)  (((p)->hdrlen+1) << 3)
   7 /*
   8  * This structure contains configuration options per IPv6 link.
   9  */
  10 struct ipv6_devconf {
  11         __s32           forwarding;
  12         __s32           hop_limit;
  13         __s32           mtu6;
  14         __s32           accept_ra;
  15         __s32           accept_redirects;
  16         __s32           autoconf;
  17         __s32           dad_transmits;
  18         __s32           rtr_solicits;
  19         __s32           rtr_solicit_interval;
  20         __s32           rtr_solicit_delay;
  21         __s32           force_mld_version;
  22 #ifdef CONFIG_IPV6_PRIVACY
  23         __s32           use_tempaddr;
  24         __s32           temp_valid_lft;
  25         __s32           temp_prefered_lft;
  26         __s32           regen_max_retry;
  27         __s32           max_desync_factor;
  28 #endif
  29         __s32           max_addresses;
  30         __s32           accept_ra_defrtr;
  31         __s32           accept_ra_pinfo;
  32 #ifdef CONFIG_IPV6_ROUTER_PREF
  33         __s32           accept_ra_rtr_pref;
  34         __s32           rtr_probe_interval;
  35 #ifdef CONFIG_IPV6_ROUTE_INFO
  36         __s32           accept_ra_rt_info_max_plen;
  37 #endif
  38 #endif
  39         __s32           proxy_ndp;
  40         __s32           accept_source_route;
  41 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
  42         __s32           optimistic_dad;
  43 #endif
  44 #ifdef CONFIG_IPV6_MROUTE
  45         __s32           mc_forwarding;
  46 #endif
  47         __s32           disable_ipv6;
  48         __s32           accept_dad;
  49         __s32           force_tllao;
  50         void            *sysctl;
  51 };
  52
  53 struct ipv6_params {
  54         __s32 disable_ipv6;
  55         __s32 autoconf;
  56 };
  57 extern struct ipv6_params ipv6_defaults;
  58 #include <linux/icmpv6.h>
  59 #include <linux/tcp.h>
  60 #include <linux/udp.h>
  61
  62 #include <net/inet_sock.h>
  63
  64 static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb)
  65 {
  66         return (struct ipv6hdr *)skb_network_header(skb);
  67 }
  68
  69 static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb)
  70 {
  71         return (struct ipv6hdr *)skb_transport_header(skb);
  72 }
  73
  74 static inline __u8 ipv6_tclass(const struct ipv6hdr *iph)
  75 {
  76         return (ntohl(*(__be32 *)iph) >> 20) & 0xff;
  77 }
  78
  79 /*
  80    This structure contains results of exthdrs parsing
  81    as offsets from skb->nh.
  82  */
  83
  84 struct inet6_skb_parm {
  85         int                     iif;
  86         __u16                   ra;
  87         __u16                   hop;
  88         __u16                   dst0;
  89         __u16                   srcrt;
  90         __u16                   dst1;
  91         __u16                   lastopt;
  92         __u16                   nhoff;
  93         __u16                   flags;
  94 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
  95         __u16                   dsthao;
  96 #endif
  97         __u16                   frag_max_size;
  98
  99 #define IP6SKB_XFRM_TRANSFORMED 1
 100 #define IP6SKB_FORWARDED        2
 101 #define IP6SKB_REROUTED         4
 102 };
 103
 104 #define IP6CB(skb)      ((struct inet6_skb_parm*)((skb)->cb))
 105 #define IP6CBMTU(skb)   ((struct ip6_mtuinfo *)((skb)->cb))
 106
 107 static inline int inet6_iif(const struct sk_buff *skb)
 108 {
 109         return IP6CB(skb)->iif;
 110 }
 111
 112 struct inet6_request_sock {
 113         struct in6_addr         loc_addr;
 114         struct in6_addr         rmt_addr;
 115         struct sk_buff          *pktopts;
 116         int                     iif;
 117 };
 118
 119 struct tcp6_request_sock {
 120         struct tcp_request_sock   tcp6rsk_tcp;
 121         struct inet6_request_sock tcp6rsk_inet6;
 122 };
 123
 124 struct ipv6_mc_socklist;
 125 struct ipv6_ac_socklist;
 126 struct ipv6_fl_socklist;
 127
 128 /**
 129  * struct ipv6_pinfo - ipv6 private area
 130  *
 131  * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc)
 132  * this _must_ be the last member, so that inet6_sk_generic
 133  * is able to calculate its offset from the base struct sock
 134  * by using the struct proto->slab_obj_size member. -acme
 135  */
 136 struct ipv6_pinfo {
 137         struct in6_addr         saddr;
 138         struct in6_addr         rcv_saddr;
 139         struct in6_addr         daddr;
 140         struct in6_pktinfo      sticky_pktinfo;
 141         const struct in6_addr           *daddr_cache;
 142 #ifdef CONFIG_IPV6_SUBTREES
 143         const struct in6_addr           *saddr_cache;
 144 #endif
 145
 146         __be32                  flow_label;
 147         __u32                   frag_size;
 148
 149         /*
 150          * Packed in 16bits.
 151          * Omit one shift by by putting the signed field at MSB.
 152          */
 153 #if defined(__BIG_ENDIAN_BITFIELD)
 154         __s16                   hop_limit:9;
 155         __u16                   __unused_1:7;
 156 #else
 157         __u16                   __unused_1:7;
 158         __s16                   hop_limit:9;
 159 #endif
 160
 161 #if defined(__BIG_ENDIAN_BITFIELD)
 162         /* Packed in 16bits. */
 163         __s16                   mcast_hops:9;
 164         __u16                   __unused_2:6,
 165                                 mc_loop:1;
 166 #else
 167         __u16                   mc_loop:1,
 168                                 __unused_2:6;
 169         __s16                   mcast_hops:9;
 170 #endif
 171         int                     ucast_oif;
 172         int                     mcast_oif;
 173
 174         /* pktoption flags */
 175         union {
 176                 struct {
 177                         __u16   srcrt:1,
 178                                 osrcrt:1,
 179                                 rxinfo:1,
 180                                 rxoinfo:1,
 181                                 rxhlim:1,
 182                                 rxohlim:1,
 183                                 hopopts:1,
 184                                 ohopopts:1,
 185                                 dstopts:1,
 186                                 odstopts:1,
 187                                 rxflow:1,
 188                                 rxtclass:1,
 189                                 rxpmtu:1,
 190                                 rxorigdstaddr:1;
 191                                 /* 2 bits hole */
 192                 } bits;
 193                 __u16           all;
 194         } rxopt;
 195
 196         /* sockopt flags */
 197         __u16                   recverr:1,
 198                                 sndflow:1,
 199                                 pmtudisc:2,
 200                                 ipv6only:1,
 201                                 srcprefs:3,     /* 001: prefer temporary address
 202                                                  * 010: prefer public address
 203                                                  * 100: prefer care-of address
 204                                                  */
 205                                 dontfrag:1;
 206         __u8                    min_hopcount;
 207         __u8                    tclass;
 208         __u8                    rcv_tclass;
 209
 210         __u32                   dst_cookie;
 211         __u32                   rx_dst_cookie;
 212
 213         struct ipv6_mc_socklist __rcu *ipv6_mc_list;
 214         struct ipv6_ac_socklist *ipv6_ac_list;
 215         struct ipv6_fl_socklist *ipv6_fl_list;
 216
 217         struct ipv6_txoptions   *opt;
 218         struct sk_buff          *pktoptions;
 219         struct sk_buff          *rxpmtu;
 220         struct {
 221                 struct ipv6_txoptions *opt;
 222                 u8 hop_limit;
 223                 u8 tclass;
 224         } cork;
 225 };
 226
 227 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
 228 struct raw6_sock {
 229         /* inet_sock has to be the first member of raw6_sock */
 230         struct inet_sock        inet;
 231         __u32                   checksum;       /* perform checksum */
 232         __u32                   offset;         /* checksum offset  */
 233         struct icmp6_filter     filter;
 234         __u32                   ip6mr_table;
 235         /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */
 236         struct ipv6_pinfo       inet6;
 237 };
 238
 239 struct udp6_sock {
 240         struct udp_sock   udp;
 241         /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */
 242         struct ipv6_pinfo inet6;
 243 };
 244
 245 struct tcp6_sock {
 246         struct tcp_sock   tcp;
 247         /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */
 248         struct ipv6_pinfo inet6;
 249 };
 250
 251 extern int inet6_sk_rebuild_header(struct sock *sk);
 252
 253 struct inet6_timewait_sock {
 254         struct in6_addr tw_v6_daddr;
 255         struct in6_addr tw_v6_rcv_saddr;
 256 };
 257
 258 struct tcp6_timewait_sock {
 259         struct tcp_timewait_sock   tcp6tw_tcp;
 260         struct inet6_timewait_sock tcp6tw_inet6;
 261 };
 262
 263 static inline struct inet6_timewait_sock *inet6_twsk(const struct sock *sk)
 264 {
 265         return (struct inet6_timewait_sock *)(((u8 *)sk) +
 266                                               inet_twsk(sk)->tw_ipv6_offset);
 267 }
 268
 269 #if IS_ENABLED(CONFIG_IPV6)
 270 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
 271 {
 272         return inet_sk(__sk)->pinet6;
 273 }
 274
 275 static inline struct inet6_request_sock *
 276                         inet6_rsk(const struct request_sock *rsk)
 277 {
 278         return (struct inet6_request_sock *)(((u8 *)rsk) +
 279                                              inet_rsk(rsk)->inet6_rsk_offset);
 280 }
 281
 282 static inline u32 inet6_rsk_offset(struct request_sock *rsk)
 283 {
 284         return rsk->rsk_ops->obj_size - sizeof(struct inet6_request_sock);
 285 }
 286
 287 static inline struct request_sock *inet6_reqsk_alloc(struct request_sock_ops *ops)
 288 {
 289         struct request_sock *req = reqsk_alloc(ops);
 290
 291         if (req != NULL) {
 292                 inet_rsk(req)->inet6_rsk_offset = inet6_rsk_offset(req);
 293                 inet6_rsk(req)->pktopts = NULL;
 294         }
 295
 296         return req;
 297 }
 298
 299 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
 300 {
 301         return (struct raw6_sock *)sk;
 302 }
 303
 304 static inline void inet_sk_copy_descendant(struct sock *sk_to,
 305                                            const struct sock *sk_from)
 306 {
 307         int ancestor_size = sizeof(struct inet_sock);
 308
 309         if (sk_from->sk_family == PF_INET6)
 310                 ancestor_size += sizeof(struct ipv6_pinfo);
 311
 312         __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
 313 }
 314
 315 #define __ipv6_only_sock(sk)    (inet6_sk(sk)->ipv6only)
 316 #define ipv6_only_sock(sk)      ((sk)->sk_family == PF_INET6 && __ipv6_only_sock(sk))
 317
 318 static inline u16 inet6_tw_offset(const struct proto *prot)
 319 {
 320         return prot->twsk_prot->twsk_obj_size -
 321                         sizeof(struct inet6_timewait_sock);
 322 }
 323
 324 static inline struct in6_addr *__inet6_rcv_saddr(const struct sock *sk)
 325 {
 326         return likely(sk->sk_state != TCP_TIME_WAIT) ?
 327                 &inet6_sk(sk)->rcv_saddr : &inet6_twsk(sk)->tw_v6_rcv_saddr;
 328 }
 329
 330 static inline struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
 331 {
 332         return sk->sk_family == AF_INET6 ? __inet6_rcv_saddr(sk) : NULL;
 333 }
 334
 335 static inline int inet_v6_ipv6only(const struct sock *sk)
 336 {
 337         return likely(sk->sk_state != TCP_TIME_WAIT) ?
 338                 ipv6_only_sock(sk) : inet_twsk(sk)->tw_ipv6only;
 339 }
 340 #else
 341 #define __ipv6_only_sock(sk)    0
 342 #define ipv6_only_sock(sk)      0
 343
 344 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
 345 {
 346         return NULL;
 347 }
 348
 349 static inline struct inet6_request_sock *
 350                         inet6_rsk(const struct request_sock *rsk)
 351 {
 352         return NULL;
 353 }
 354
 355 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
 356 {
 357         return NULL;
 358 }
 359
 360 #define __inet6_rcv_saddr(__sk) NULL
 361 #define inet6_rcv_saddr(__sk)   NULL
 362 #define tcp_twsk_ipv6only(__sk)         0
 363 #define inet_v6_ipv6only(__sk)          0
 364 #endif /* IS_ENABLED(CONFIG_IPV6) */
 365
 366 #define INET6_MATCH(__sk, __net, __hash, __saddr, __daddr, __ports, __dif)\
 367         (((__sk)->sk_hash == (__hash)) && sock_net((__sk)) == (__net)   && \
 368          ((*((__portpair *)&(inet_sk(__sk)->inet_dport))) == (__ports)) && \
 369          ((__sk)->sk_family             == AF_INET6)            && \
 370          ipv6_addr_equal(&inet6_sk(__sk)->daddr, (__saddr))     && \
 371          ipv6_addr_equal(&inet6_sk(__sk)->rcv_saddr, (__daddr)) && \
 372          (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif))))
 373
 374 #define INET6_TW_MATCH(__sk, __net, __hash, __saddr, __daddr, __ports, __dif) \
 375         (((__sk)->sk_hash == (__hash)) && sock_net((__sk)) == (__net)   && \
 376          (*((__portpair *)&(inet_twsk(__sk)->tw_dport)) == (__ports))   && \
 377          ((__sk)->sk_family            == PF_INET6)                     && \
 378          (ipv6_addr_equal(&inet6_twsk(__sk)->tw_v6_daddr, (__saddr)))   && \
 379          (ipv6_addr_equal(&inet6_twsk(__sk)->tw_v6_rcv_saddr, (__daddr))) && \
 380          (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif))))
 381
 382 #endif /* _IPV6_H */