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         __s32           ndisc_notify;
  51         void            *sysctl;
  52 };
  53
  54 struct ipv6_params {
  55         __s32 disable_ipv6;
  56         __s32 autoconf;
  57 };
  58 extern struct ipv6_params ipv6_defaults;
  59 #include <linux/icmpv6.h>
  60 #include <linux/tcp.h>
  61 #include <linux/udp.h>
  62
  63 #include <net/inet_sock.h>
  64
  65 static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb)
  66 {
  67         return (struct ipv6hdr *)skb_network_header(skb);
  68 }
  69
  70 static inline struct ipv6hdr *inner_ipv6_hdr(const struct sk_buff *skb)
  71 {
  72         return (struct ipv6hdr *)skb_inner_network_header(skb);
  73 }
  74
  75 static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb)
  76 {
  77         return (struct ipv6hdr *)skb_transport_header(skb);
  78 }
  79
  80 /*
  81    This structure contains results of exthdrs parsing
  82    as offsets from skb->nh.
  83  */
  84
  85 struct inet6_skb_parm {
  86         int                     iif;
  87         __be16                  ra;
  88         __u16                   hop;
  89         __u16                   dst0;
  90         __u16                   srcrt;
  91         __u16                   dst1;
  92         __u16                   lastopt;
  93         __u16                   nhoff;
  94         __u16                   flags;
  95 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
  96         __u16                   dsthao;
  97 #endif
  98         __u16                   frag_max_size;
  99
 100 #define IP6SKB_XFRM_TRANSFORMED 1
 101 #define IP6SKB_FORWARDED        2
 102 #define IP6SKB_REROUTED         4
 103 #define IP6SKB_ROUTERALERT      8
 104 };
 105
 106 #define IP6CB(skb)      ((struct inet6_skb_parm*)((skb)->cb))
 107 #define IP6CBMTU(skb)   ((struct ip6_mtuinfo *)((skb)->cb))
 108
 109 static inline int inet6_iif(const struct sk_buff *skb)
 110 {
 111         return IP6CB(skb)->iif;
 112 }
 113
 114 struct inet6_request_sock {
 115         struct in6_addr         loc_addr;
 116         struct in6_addr         rmt_addr;
 117         struct sk_buff          *pktopts;
 118         int                     iif;
 119 };
 120
 121 struct tcp6_request_sock {
 122         struct tcp_request_sock   tcp6rsk_tcp;
 123         struct inet6_request_sock tcp6rsk_inet6;
 124 };
 125
 126 struct ipv6_mc_socklist;
 127 struct ipv6_ac_socklist;
 128 struct ipv6_fl_socklist;
 129
 130 /**
 131  * struct ipv6_pinfo - ipv6 private area
 132  *
 133  * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc)
 134  * this _must_ be the last member, so that inet6_sk_generic
 135  * is able to calculate its offset from the base struct sock
 136  * by using the struct proto->slab_obj_size member. -acme
 137  */
 138 struct ipv6_pinfo {
 139         struct in6_addr         saddr;
 140         struct in6_addr         rcv_saddr;
 141         struct in6_addr         daddr;
 142         struct in6_pktinfo      sticky_pktinfo;
 143         const struct in6_addr           *daddr_cache;
 144 #ifdef CONFIG_IPV6_SUBTREES
 145         const struct in6_addr           *saddr_cache;
 146 #endif
 147
 148         __be32                  flow_label;
 149         __u32                   frag_size;
 150
 151         /*
 152          * Packed in 16bits.
 153          * Omit one shift by by putting the signed field at MSB.
 154          */
 155 #if defined(__BIG_ENDIAN_BITFIELD)
 156         __s16                   hop_limit:9;
 157         __u16                   __unused_1:7;
 158 #else
 159         __u16                   __unused_1:7;
 160         __s16                   hop_limit:9;
 161 #endif
 162
 163 #if defined(__BIG_ENDIAN_BITFIELD)
 164         /* Packed in 16bits. */
 165         __s16                   mcast_hops:9;
 166         __u16                   __unused_2:6,
 167                                 mc_loop:1;
 168 #else
 169         __u16                   mc_loop:1,
 170                                 __unused_2:6;
 171         __s16                   mcast_hops:9;
 172 #endif
 173         int                     ucast_oif;
 174         int                     mcast_oif;
 175
 176         /* pktoption flags */
 177         union {
 178                 struct {
 179                         __u16   srcrt:1,
 180                                 osrcrt:1,
 181                                 rxinfo:1,
 182                                 rxoinfo:1,
 183                                 rxhlim:1,
 184                                 rxohlim:1,
 185                                 hopopts:1,
 186                                 ohopopts:1,
 187                                 dstopts:1,
 188                                 odstopts:1,
 189                                 rxflow:1,
 190                                 rxtclass:1,
 191                                 rxpmtu:1,
 192                                 rxorigdstaddr:1;
 193                                 /* 2 bits hole */
 194                 } bits;
 195                 __u16           all;
 196         } rxopt;
 197
 198         /* sockopt flags */
 199         __u16                   recverr:1,
 200                                 sndflow:1,
 201                                 pmtudisc:2,
 202                                 ipv6only:1,
 203                                 srcprefs:3,     /* 001: prefer temporary address
 204                                                  * 010: prefer public address
 205                                                  * 100: prefer care-of address
 206                                                  */
 207                                 dontfrag:1;
 208         __u8                    min_hopcount;
 209         __u8                    tclass;
 210         __u8                    rcv_tclass;
 211
 212         __u32                   dst_cookie;
 213         __u32                   rx_dst_cookie;
 214
 215         struct ipv6_mc_socklist __rcu *ipv6_mc_list;
 216         struct ipv6_ac_socklist *ipv6_ac_list;
 217         struct ipv6_fl_socklist __rcu *ipv6_fl_list;
 218
 219         struct ipv6_txoptions   *opt;
 220         struct sk_buff          *pktoptions;
 221         struct sk_buff          *rxpmtu;
 222         struct {
 223                 struct ipv6_txoptions *opt;
 224                 u8 hop_limit;
 225                 u8 tclass;
 226         } cork;
 227 };
 228
 229 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
 230 struct raw6_sock {
 231         /* inet_sock has to be the first member of raw6_sock */
 232         struct inet_sock        inet;
 233         __u32                   checksum;       /* perform checksum */
 234         __u32                   offset;         /* checksum offset  */
 235         struct icmp6_filter     filter;
 236         __u32                   ip6mr_table;
 237         /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */
 238         struct ipv6_pinfo       inet6;
 239 };
 240
 241 struct udp6_sock {
 242         struct udp_sock   udp;
 243         /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */
 244         struct ipv6_pinfo inet6;
 245 };
 246
 247 struct tcp6_sock {
 248         struct tcp_sock   tcp;
 249         /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */
 250         struct ipv6_pinfo inet6;
 251 };
 252
 253 extern int inet6_sk_rebuild_header(struct sock *sk);
 254
 255 struct inet6_timewait_sock {
 256         struct in6_addr tw_v6_daddr;
 257         struct in6_addr tw_v6_rcv_saddr;
 258 };
 259
 260 struct tcp6_timewait_sock {
 261         struct tcp_timewait_sock   tcp6tw_tcp;
 262         struct inet6_timewait_sock tcp6tw_inet6;
 263 };
 264
 265 static inline struct inet6_timewait_sock *inet6_twsk(const struct sock *sk)
 266 {
 267         return (struct inet6_timewait_sock *)(((u8 *)sk) +
 268                                               inet_twsk(sk)->tw_ipv6_offset);
 269 }
 270
 271 #if IS_ENABLED(CONFIG_IPV6)
 272 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
 273 {
 274         return inet_sk(__sk)->pinet6;
 275 }
 276
 277 static inline struct inet6_request_sock *
 278                         inet6_rsk(const struct request_sock *rsk)
 279 {
 280         return (struct inet6_request_sock *)(((u8 *)rsk) +
 281                                              inet_rsk(rsk)->inet6_rsk_offset);
 282 }
 283
 284 static inline u32 inet6_rsk_offset(struct request_sock *rsk)
 285 {
 286         return rsk->rsk_ops->obj_size - sizeof(struct inet6_request_sock);
 287 }
 288
 289 static inline struct request_sock *inet6_reqsk_alloc(struct request_sock_ops *ops)
 290 {
 291         struct request_sock *req = reqsk_alloc(ops);
 292
 293         if (req != NULL) {
 294                 inet_rsk(req)->inet6_rsk_offset = inet6_rsk_offset(req);
 295                 inet6_rsk(req)->pktopts = NULL;
 296         }
 297
 298         return req;
 299 }
 300
 301 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
 302 {
 303         return (struct raw6_sock *)sk;
 304 }
 305
 306 static inline void inet_sk_copy_descendant(struct sock *sk_to,
 307                                            const struct sock *sk_from)
 308 {
 309         int ancestor_size = sizeof(struct inet_sock);
 310
 311         if (sk_from->sk_family == PF_INET6)
 312                 ancestor_size += sizeof(struct ipv6_pinfo);
 313
 314         __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
 315 }
 316
 317 #define __ipv6_only_sock(sk)    (inet6_sk(sk)->ipv6only)
 318 #define ipv6_only_sock(sk)      ((sk)->sk_family == PF_INET6 && __ipv6_only_sock(sk))
 319
 320 static inline u16 inet6_tw_offset(const struct proto *prot)
 321 {
 322         return prot->twsk_prot->twsk_obj_size -
 323                         sizeof(struct inet6_timewait_sock);
 324 }
 325
 326 static inline struct in6_addr *__inet6_rcv_saddr(const struct sock *sk)
 327 {
 328         return likely(sk->sk_state != TCP_TIME_WAIT) ?
 329                 &inet6_sk(sk)->rcv_saddr : &inet6_twsk(sk)->tw_v6_rcv_saddr;
 330 }
 331
 332 static inline struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
 333 {
 334         return sk->sk_family == AF_INET6 ? __inet6_rcv_saddr(sk) : NULL;
 335 }
 336
 337 static inline int inet_v6_ipv6only(const struct sock *sk)
 338 {
 339         return likely(sk->sk_state != TCP_TIME_WAIT) ?
 340                 ipv6_only_sock(sk) : inet_twsk(sk)->tw_ipv6only;
 341 }
 342 #else
 343 #define __ipv6_only_sock(sk)    0
 344 #define ipv6_only_sock(sk)      0
 345
 346 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
 347 {
 348         return NULL;
 349 }
 350
 351 static inline struct inet6_request_sock *
 352                         inet6_rsk(const struct request_sock *rsk)
 353 {
 354         return NULL;
 355 }
 356
 357 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
 358 {
 359         return NULL;
 360 }
 361
 362 #define __inet6_rcv_saddr(__sk) NULL
 363 #define inet6_rcv_saddr(__sk)   NULL
 364 #define tcp_twsk_ipv6only(__sk)         0
 365 #define inet_v6_ipv6only(__sk)          0
 366 #endif /* IS_ENABLED(CONFIG_IPV6) */
 367
 368 #define INET6_MATCH(__sk, __net, __saddr, __daddr, __ports, __dif)      \
 369         ((inet_sk(__sk)->inet_portpair == (__ports))            &&      \
 370          ((__sk)->sk_family == AF_INET6)                        &&      \
 371          ipv6_addr_equal(&inet6_sk(__sk)->daddr, (__saddr))     &&      \
 372          ipv6_addr_equal(&inet6_sk(__sk)->rcv_saddr, (__daddr)) &&      \
 373          (!(__sk)->sk_bound_dev_if      ||                              \
 374            ((__sk)->sk_bound_dev_if == (__dif)))                &&      \
 375          net_eq(sock_net(__sk), (__net)))
 376
 377 #define INET6_TW_MATCH(__sk, __net, __saddr, __daddr, __ports, __dif)      \
 378         ((inet_twsk(__sk)->tw_portpair == (__ports))                    && \
 379          ((__sk)->sk_family == AF_INET6)                                && \
 380          ipv6_addr_equal(&inet6_twsk(__sk)->tw_v6_daddr, (__saddr))     && \
 381          ipv6_addr_equal(&inet6_twsk(__sk)->tw_v6_rcv_saddr, (__daddr)) && \
 382          (!(__sk)->sk_bound_dev_if      ||                                 \
 383           ((__sk)->sk_bound_dev_if == (__dif)))                         && \
 384          net_eq(sock_net(__sk), (__net)))
 385
 386 #endif /* _IPV6_H */