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         __s32           mldv1_unsolicited_report_interval;
  23         __s32           mldv2_unsolicited_report_interval;
  24 #ifdef CONFIG_IPV6_PRIVACY
  25         __s32           use_tempaddr;
  26         __s32           temp_valid_lft;
  27         __s32           temp_prefered_lft;
  28         __s32           regen_max_retry;
  29         __s32           max_desync_factor;
  30 #endif
  31         __s32           max_addresses;
  32         __s32           accept_ra_defrtr;
  33         __s32           accept_ra_pinfo;
  34 #ifdef CONFIG_IPV6_ROUTER_PREF
  35         __s32           accept_ra_rtr_pref;
  36         __s32           rtr_probe_interval;
  37 #ifdef CONFIG_IPV6_ROUTE_INFO
  38         __s32           accept_ra_rt_info_max_plen;
  39 #endif
  40 #endif
  41         __s32           proxy_ndp;
  42         __s32           accept_source_route;
  43 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
  44         __s32           optimistic_dad;
  45 #endif
  46 #ifdef CONFIG_IPV6_MROUTE
  47         __s32           mc_forwarding;
  48 #endif
  49         __s32           disable_ipv6;
  50         __s32           accept_dad;
  51         __s32           force_tllao;
  52         __s32           ndisc_notify;
  53         __s32           suppress_frag_ndisc;
  54         void            *sysctl;
  55 };
  56
  57 struct ipv6_params {
  58         __s32 disable_ipv6;
  59         __s32 autoconf;
  60 };
  61 extern struct ipv6_params ipv6_defaults;
  62 #include <linux/icmpv6.h>
  63 #include <linux/tcp.h>
  64 #include <linux/udp.h>
  65
  66 #include <net/inet_sock.h>
  67
  68 static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb)
  69 {
  70         return (struct ipv6hdr *)skb_network_header(skb);
  71 }
  72
  73 static inline struct ipv6hdr *inner_ipv6_hdr(const struct sk_buff *skb)
  74 {
  75         return (struct ipv6hdr *)skb_inner_network_header(skb);
  76 }
  77
  78 static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb)
  79 {
  80         return (struct ipv6hdr *)skb_transport_header(skb);
  81 }
  82
  83 /*
  84    This structure contains results of exthdrs parsing
  85    as offsets from skb->nh.
  86  */
  87
  88 struct inet6_skb_parm {
  89         int                     iif;
  90         __be16                  ra;
  91         __u16                   hop;
  92         __u16                   dst0;
  93         __u16                   srcrt;
  94         __u16                   dst1;
  95         __u16                   lastopt;
  96         __u16                   nhoff;
  97         __u16                   flags;
  98 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
  99         __u16                   dsthao;
 100 #endif
 101         __u16                   frag_max_size;
 102
 103 #define IP6SKB_XFRM_TRANSFORMED 1
 104 #define IP6SKB_FORWARDED        2
 105 #define IP6SKB_REROUTED         4
 106 #define IP6SKB_ROUTERALERT      8
 107 #define IP6SKB_FRAGMENTED      16
 108 };
 109
 110 #define IP6CB(skb)      ((struct inet6_skb_parm*)((skb)->cb))
 111 #define IP6CBMTU(skb)   ((struct ip6_mtuinfo *)((skb)->cb))
 112
 113 static inline int inet6_iif(const struct sk_buff *skb)
 114 {
 115         return IP6CB(skb)->iif;
 116 }
 117
 118 struct inet6_request_sock {
 119         struct in6_addr         loc_addr;
 120         struct in6_addr         rmt_addr;
 121         struct sk_buff          *pktopts;
 122         int                     iif;
 123 };
 124
 125 struct tcp6_request_sock {
 126         struct tcp_request_sock   tcp6rsk_tcp;
 127         struct inet6_request_sock tcp6rsk_inet6;
 128 };
 129
 130 struct ipv6_mc_socklist;
 131 struct ipv6_ac_socklist;
 132 struct ipv6_fl_socklist;
 133
 134 /**
 135  * struct ipv6_pinfo - ipv6 private area
 136  *
 137  * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc)
 138  * this _must_ be the last member, so that inet6_sk_generic
 139  * is able to calculate its offset from the base struct sock
 140  * by using the struct proto->slab_obj_size member. -acme
 141  */
 142 struct ipv6_pinfo {
 143         struct in6_addr         saddr;
 144         struct in6_addr         rcv_saddr;
 145         struct in6_addr         daddr;
 146         struct in6_pktinfo      sticky_pktinfo;
 147         const struct in6_addr           *daddr_cache;
 148 #ifdef CONFIG_IPV6_SUBTREES
 149         const struct in6_addr           *saddr_cache;
 150 #endif
 151
 152         __be32                  flow_label;
 153         __u32                   frag_size;
 154
 155         /*
 156          * Packed in 16bits.
 157          * Omit one shift by by putting the signed field at MSB.
 158          */
 159 #if defined(__BIG_ENDIAN_BITFIELD)
 160         __s16                   hop_limit:9;
 161         __u16                   __unused_1:7;
 162 #else
 163         __u16                   __unused_1:7;
 164         __s16                   hop_limit:9;
 165 #endif
 166
 167 #if defined(__BIG_ENDIAN_BITFIELD)
 168         /* Packed in 16bits. */
 169         __s16                   mcast_hops:9;
 170         __u16                   __unused_2:6,
 171                                 mc_loop:1;
 172 #else
 173         __u16                   mc_loop:1,
 174                                 __unused_2:6;
 175         __s16                   mcast_hops:9;
 176 #endif
 177         int                     ucast_oif;
 178         int                     mcast_oif;
 179
 180         /* pktoption flags */
 181         union {
 182                 struct {
 183                         __u16   srcrt:1,
 184                                 osrcrt:1,
 185                                 rxinfo:1,
 186                                 rxoinfo:1,
 187                                 rxhlim:1,
 188                                 rxohlim:1,
 189                                 hopopts:1,
 190                                 ohopopts:1,
 191                                 dstopts:1,
 192                                 odstopts:1,
 193                                 rxflow:1,
 194                                 rxtclass:1,
 195                                 rxpmtu:1,
 196                                 rxorigdstaddr:1;
 197                                 /* 2 bits hole */
 198                 } bits;
 199                 __u16           all;
 200         } rxopt;
 201
 202         /* sockopt flags */
 203         __u16                   recverr:1,
 204                                 sndflow:1,
 205                                 pmtudisc:2,
 206                                 ipv6only:1,
 207                                 srcprefs:3,     /* 001: prefer temporary address
 208                                                  * 010: prefer public address
 209                                                  * 100: prefer care-of address
 210                                                  */
 211                                 dontfrag:1;
 212         __u8                    min_hopcount;
 213         __u8                    tclass;
 214         __u8                    rcv_tclass;
 215
 216         __u32                   dst_cookie;
 217         __u32                   rx_dst_cookie;
 218
 219         struct ipv6_mc_socklist __rcu *ipv6_mc_list;
 220         struct ipv6_ac_socklist *ipv6_ac_list;
 221         struct ipv6_fl_socklist __rcu *ipv6_fl_list;
 222
 223         struct ipv6_txoptions   *opt;
 224         struct sk_buff          *pktoptions;
 225         struct sk_buff          *rxpmtu;
 226         struct {
 227                 struct ipv6_txoptions *opt;
 228                 u8 hop_limit;
 229                 u8 tclass;
 230         } cork;
 231 };
 232
 233 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
 234 struct raw6_sock {
 235         /* inet_sock has to be the first member of raw6_sock */
 236         struct inet_sock        inet;
 237         __u32                   checksum;       /* perform checksum */
 238         __u32                   offset;         /* checksum offset  */
 239         struct icmp6_filter     filter;
 240         __u32                   ip6mr_table;
 241         /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */
 242         struct ipv6_pinfo       inet6;
 243 };
 244
 245 struct udp6_sock {
 246         struct udp_sock   udp;
 247         /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */
 248         struct ipv6_pinfo inet6;
 249 };
 250
 251 struct tcp6_sock {
 252         struct tcp_sock   tcp;
 253         /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */
 254         struct ipv6_pinfo inet6;
 255 };
 256
 257 extern int inet6_sk_rebuild_header(struct sock *sk);
 258
 259 struct inet6_timewait_sock {
 260         struct in6_addr tw_v6_daddr;
 261         struct in6_addr tw_v6_rcv_saddr;
 262 };
 263
 264 struct tcp6_timewait_sock {
 265         struct tcp_timewait_sock   tcp6tw_tcp;
 266         struct inet6_timewait_sock tcp6tw_inet6;
 267 };
 268
 269 static inline struct inet6_timewait_sock *inet6_twsk(const struct sock *sk)
 270 {
 271         return (struct inet6_timewait_sock *)(((u8 *)sk) +
 272                                               inet_twsk(sk)->tw_ipv6_offset);
 273 }
 274
 275 #if IS_ENABLED(CONFIG_IPV6)
 276 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
 277 {
 278         return inet_sk(__sk)->pinet6;
 279 }
 280
 281 static inline struct inet6_request_sock *
 282                         inet6_rsk(const struct request_sock *rsk)
 283 {
 284         return (struct inet6_request_sock *)(((u8 *)rsk) +
 285                                              inet_rsk(rsk)->inet6_rsk_offset);
 286 }
 287
 288 static inline u32 inet6_rsk_offset(struct request_sock *rsk)
 289 {
 290         return rsk->rsk_ops->obj_size - sizeof(struct inet6_request_sock);
 291 }
 292
 293 static inline struct request_sock *inet6_reqsk_alloc(struct request_sock_ops *ops)
 294 {
 295         struct request_sock *req = reqsk_alloc(ops);
 296
 297         if (req != NULL) {
 298                 inet_rsk(req)->inet6_rsk_offset = inet6_rsk_offset(req);
 299                 inet6_rsk(req)->pktopts = NULL;
 300         }
 301
 302         return req;
 303 }
 304
 305 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
 306 {
 307         return (struct raw6_sock *)sk;
 308 }
 309
 310 static inline void inet_sk_copy_descendant(struct sock *sk_to,
 311                                            const struct sock *sk_from)
 312 {
 313         int ancestor_size = sizeof(struct inet_sock);
 314
 315         if (sk_from->sk_family == PF_INET6)
 316                 ancestor_size += sizeof(struct ipv6_pinfo);
 317
 318         __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
 319 }
 320
 321 #define __ipv6_only_sock(sk)    (inet6_sk(sk)->ipv6only)
 322 #define ipv6_only_sock(sk)      ((sk)->sk_family == PF_INET6 && __ipv6_only_sock(sk))
 323
 324 static inline u16 inet6_tw_offset(const struct proto *prot)
 325 {
 326         return prot->twsk_prot->twsk_obj_size -
 327                         sizeof(struct inet6_timewait_sock);
 328 }
 329
 330 static inline struct in6_addr *__inet6_rcv_saddr(const struct sock *sk)
 331 {
 332         return likely(sk->sk_state != TCP_TIME_WAIT) ?
 333                 &inet6_sk(sk)->rcv_saddr : &inet6_twsk(sk)->tw_v6_rcv_saddr;
 334 }
 335
 336 static inline struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
 337 {
 338         return sk->sk_family == AF_INET6 ? __inet6_rcv_saddr(sk) : NULL;
 339 }
 340
 341 static inline int inet_v6_ipv6only(const struct sock *sk)
 342 {
 343         return likely(sk->sk_state != TCP_TIME_WAIT) ?
 344                 ipv6_only_sock(sk) : inet_twsk(sk)->tw_ipv6only;
 345 }
 346 #else
 347 #define __ipv6_only_sock(sk)    0
 348 #define ipv6_only_sock(sk)      0
 349
 350 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
 351 {
 352         return NULL;
 353 }
 354
 355 static inline struct inet6_request_sock *
 356                         inet6_rsk(const struct request_sock *rsk)
 357 {
 358         return NULL;
 359 }
 360
 361 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
 362 {
 363         return NULL;
 364 }
 365
 366 #define __inet6_rcv_saddr(__sk) NULL
 367 #define inet6_rcv_saddr(__sk)   NULL
 368 #define tcp_twsk_ipv6only(__sk)         0
 369 #define inet_v6_ipv6only(__sk)          0
 370 #endif /* IS_ENABLED(CONFIG_IPV6) */
 371
 372 #define INET6_MATCH(__sk, __net, __saddr, __daddr, __ports, __dif)      \
 373         ((inet_sk(__sk)->inet_portpair == (__ports))            &&      \
 374          ((__sk)->sk_family == AF_INET6)                        &&      \
 375          ipv6_addr_equal(&inet6_sk(__sk)->daddr, (__saddr))     &&      \
 376          ipv6_addr_equal(&inet6_sk(__sk)->rcv_saddr, (__daddr)) &&      \
 377          (!(__sk)->sk_bound_dev_if      ||                              \
 378            ((__sk)->sk_bound_dev_if == (__dif)))                &&      \
 379          net_eq(sock_net(__sk), (__net)))
 380
 381 #define INET6_TW_MATCH(__sk, __net, __saddr, __daddr, __ports, __dif)      \
 382         ((inet_twsk(__sk)->tw_portpair == (__ports))                    && \
 383          ((__sk)->sk_family == AF_INET6)                                && \
 384          ipv6_addr_equal(&inet6_twsk(__sk)->tw_v6_daddr, (__saddr))     && \
 385          ipv6_addr_equal(&inet6_twsk(__sk)->tw_v6_rcv_saddr, (__daddr)) && \
 386          (!(__sk)->sk_bound_dev_if      ||                                 \
 387           ((__sk)->sk_bound_dev_if == (__dif)))                         && \
 388          net_eq(sock_net(__sk), (__net)))
 389
 390 #endif /* _IPV6_H */