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 #define IP6SKB_FRAGMENTED      16
 105 };
 106
 107 #define IP6CB(skb)      ((struct inet6_skb_parm*)((skb)->cb))
 108 #define IP6CBMTU(skb)   ((struct ip6_mtuinfo *)((skb)->cb))
 109
 110 static inline int inet6_iif(const struct sk_buff *skb)
 111 {
 112         return IP6CB(skb)->iif;
 113 }
 114
 115 struct inet6_request_sock {
 116         struct in6_addr         loc_addr;
 117         struct in6_addr         rmt_addr;
 118         struct sk_buff          *pktopts;
 119         int                     iif;
 120 };
 121
 122 struct tcp6_request_sock {
 123         struct tcp_request_sock   tcp6rsk_tcp;
 124         struct inet6_request_sock tcp6rsk_inet6;
 125 };
 126
 127 struct ipv6_mc_socklist;
 128 struct ipv6_ac_socklist;
 129 struct ipv6_fl_socklist;
 130
 131 /**
 132  * struct ipv6_pinfo - ipv6 private area
 133  *
 134  * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc)
 135  * this _must_ be the last member, so that inet6_sk_generic
 136  * is able to calculate its offset from the base struct sock
 137  * by using the struct proto->slab_obj_size member. -acme
 138  */
 139 struct ipv6_pinfo {
 140         struct in6_addr         saddr;
 141         struct in6_addr         rcv_saddr;
 142         struct in6_addr         daddr;
 143         struct in6_pktinfo      sticky_pktinfo;
 144         const struct in6_addr           *daddr_cache;
 145 #ifdef CONFIG_IPV6_SUBTREES
 146         const struct in6_addr           *saddr_cache;
 147 #endif
 148
 149         __be32                  flow_label;
 150         __u32                   frag_size;
 151
 152         /*
 153          * Packed in 16bits.
 154          * Omit one shift by by putting the signed field at MSB.
 155          */
 156 #if defined(__BIG_ENDIAN_BITFIELD)
 157         __s16                   hop_limit:9;
 158         __u16                   __unused_1:7;
 159 #else
 160         __u16                   __unused_1:7;
 161         __s16                   hop_limit:9;
 162 #endif
 163
 164 #if defined(__BIG_ENDIAN_BITFIELD)
 165         /* Packed in 16bits. */
 166         __s16                   mcast_hops:9;
 167         __u16                   __unused_2:6,
 168                                 mc_loop:1;
 169 #else
 170         __u16                   mc_loop:1,
 171                                 __unused_2:6;
 172         __s16                   mcast_hops:9;
 173 #endif
 174         int                     ucast_oif;
 175         int                     mcast_oif;
 176
 177         /* pktoption flags */
 178         union {
 179                 struct {
 180                         __u16   srcrt:1,
 181                                 osrcrt:1,
 182                                 rxinfo:1,
 183                                 rxoinfo:1,
 184                                 rxhlim:1,
 185                                 rxohlim:1,
 186                                 hopopts:1,
 187                                 ohopopts:1,
 188                                 dstopts:1,
 189                                 odstopts:1,
 190                                 rxflow:1,
 191                                 rxtclass:1,
 192                                 rxpmtu:1,
 193                                 rxorigdstaddr:1;
 194                                 /* 2 bits hole */
 195                 } bits;
 196                 __u16           all;
 197         } rxopt;
 198
 199         /* sockopt flags */
 200         __u16                   recverr:1,
 201                                 sndflow:1,
 202                                 pmtudisc:2,
 203                                 ipv6only:1,
 204                                 srcprefs:3,     /* 001: prefer temporary address
 205                                                  * 010: prefer public address
 206                                                  * 100: prefer care-of address
 207                                                  */
 208                                 dontfrag:1;
 209         __u8                    min_hopcount;
 210         __u8                    tclass;
 211         __u8                    rcv_tclass;
 212
 213         __u32                   dst_cookie;
 214         __u32                   rx_dst_cookie;
 215
 216         struct ipv6_mc_socklist __rcu *ipv6_mc_list;
 217         struct ipv6_ac_socklist *ipv6_ac_list;
 218         struct ipv6_fl_socklist __rcu *ipv6_fl_list;
 219
 220         struct ipv6_txoptions   *opt;
 221         struct sk_buff          *pktoptions;
 222         struct sk_buff          *rxpmtu;
 223         struct {
 224                 struct ipv6_txoptions *opt;
 225                 u8 hop_limit;
 226                 u8 tclass;
 227         } cork;
 228 };
 229
 230 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
 231 struct raw6_sock {
 232         /* inet_sock has to be the first member of raw6_sock */
 233         struct inet_sock        inet;
 234         __u32                   checksum;       /* perform checksum */
 235         __u32                   offset;         /* checksum offset  */
 236         struct icmp6_filter     filter;
 237         __u32                   ip6mr_table;
 238         /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */
 239         struct ipv6_pinfo       inet6;
 240 };
 241
 242 struct udp6_sock {
 243         struct udp_sock   udp;
 244         /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */
 245         struct ipv6_pinfo inet6;
 246 };
 247
 248 struct tcp6_sock {
 249         struct tcp_sock   tcp;
 250         /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */
 251         struct ipv6_pinfo inet6;
 252 };
 253
 254 extern int inet6_sk_rebuild_header(struct sock *sk);
 255
 256 struct inet6_timewait_sock {
 257         struct in6_addr tw_v6_daddr;
 258         struct in6_addr tw_v6_rcv_saddr;
 259 };
 260
 261 struct tcp6_timewait_sock {
 262         struct tcp_timewait_sock   tcp6tw_tcp;
 263         struct inet6_timewait_sock tcp6tw_inet6;
 264 };
 265
 266 static inline struct inet6_timewait_sock *inet6_twsk(const struct sock *sk)
 267 {
 268         return (struct inet6_timewait_sock *)(((u8 *)sk) +
 269                                               inet_twsk(sk)->tw_ipv6_offset);
 270 }
 271
 272 #if IS_ENABLED(CONFIG_IPV6)
 273 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
 274 {
 275         return inet_sk(__sk)->pinet6;
 276 }
 277
 278 static inline struct inet6_request_sock *
 279                         inet6_rsk(const struct request_sock *rsk)
 280 {
 281         return (struct inet6_request_sock *)(((u8 *)rsk) +
 282                                              inet_rsk(rsk)->inet6_rsk_offset);
 283 }
 284
 285 static inline u32 inet6_rsk_offset(struct request_sock *rsk)
 286 {
 287         return rsk->rsk_ops->obj_size - sizeof(struct inet6_request_sock);
 288 }
 289
 290 static inline struct request_sock *inet6_reqsk_alloc(struct request_sock_ops *ops)
 291 {
 292         struct request_sock *req = reqsk_alloc(ops);
 293
 294         if (req != NULL) {
 295                 inet_rsk(req)->inet6_rsk_offset = inet6_rsk_offset(req);
 296                 inet6_rsk(req)->pktopts = NULL;
 297         }
 298
 299         return req;
 300 }
 301
 302 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
 303 {
 304         return (struct raw6_sock *)sk;
 305 }
 306
 307 static inline void inet_sk_copy_descendant(struct sock *sk_to,
 308                                            const struct sock *sk_from)
 309 {
 310         int ancestor_size = sizeof(struct inet_sock);
 311
 312         if (sk_from->sk_family == PF_INET6)
 313                 ancestor_size += sizeof(struct ipv6_pinfo);
 314
 315         __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
 316 }
 317
 318 #define __ipv6_only_sock(sk)    (inet6_sk(sk)->ipv6only)
 319 #define ipv6_only_sock(sk)      ((sk)->sk_family == PF_INET6 && __ipv6_only_sock(sk))
 320
 321 static inline u16 inet6_tw_offset(const struct proto *prot)
 322 {
 323         return prot->twsk_prot->twsk_obj_size -
 324                         sizeof(struct inet6_timewait_sock);
 325 }
 326
 327 static inline struct in6_addr *__inet6_rcv_saddr(const struct sock *sk)
 328 {
 329         return likely(sk->sk_state != TCP_TIME_WAIT) ?
 330                 &inet6_sk(sk)->rcv_saddr : &inet6_twsk(sk)->tw_v6_rcv_saddr;
 331 }
 332
 333 static inline struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
 334 {
 335         return sk->sk_family == AF_INET6 ? __inet6_rcv_saddr(sk) : NULL;
 336 }
 337
 338 static inline int inet_v6_ipv6only(const struct sock *sk)
 339 {
 340         return likely(sk->sk_state != TCP_TIME_WAIT) ?
 341                 ipv6_only_sock(sk) : inet_twsk(sk)->tw_ipv6only;
 342 }
 343 #else
 344 #define __ipv6_only_sock(sk)    0
 345 #define ipv6_only_sock(sk)      0
 346
 347 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
 348 {
 349         return NULL;
 350 }
 351
 352 static inline struct inet6_request_sock *
 353                         inet6_rsk(const struct request_sock *rsk)
 354 {
 355         return NULL;
 356 }
 357
 358 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
 359 {
 360         return NULL;
 361 }
 362
 363 #define __inet6_rcv_saddr(__sk) NULL
 364 #define inet6_rcv_saddr(__sk)   NULL
 365 #define tcp_twsk_ipv6only(__sk)         0
 366 #define inet_v6_ipv6only(__sk)          0
 367 #endif /* IS_ENABLED(CONFIG_IPV6) */
 368
 369 #define INET6_MATCH(__sk, __net, __saddr, __daddr, __ports, __dif)      \
 370         ((inet_sk(__sk)->inet_portpair == (__ports))            &&      \
 371          ((__sk)->sk_family == AF_INET6)                        &&      \
 372          ipv6_addr_equal(&inet6_sk(__sk)->daddr, (__saddr))     &&      \
 373          ipv6_addr_equal(&inet6_sk(__sk)->rcv_saddr, (__daddr)) &&      \
 374          (!(__sk)->sk_bound_dev_if      ||                              \
 375            ((__sk)->sk_bound_dev_if == (__dif)))                &&      \
 376          net_eq(sock_net(__sk), (__net)))
 377
 378 #define INET6_TW_MATCH(__sk, __net, __saddr, __daddr, __ports, __dif)      \
 379         ((inet_twsk(__sk)->tw_portpair == (__ports))                    && \
 380          ((__sk)->sk_family == AF_INET6)                                && \
 381          ipv6_addr_equal(&inet6_twsk(__sk)->tw_v6_daddr, (__saddr))     && \
 382          ipv6_addr_equal(&inet6_twsk(__sk)->tw_v6_rcv_saddr, (__daddr)) && \
 383          (!(__sk)->sk_bound_dev_if      ||                                 \
 384           ((__sk)->sk_bound_dev_if == (__dif)))                         && \
 385          net_eq(sock_net(__sk), (__net)))
 386
 387 #endif /* _IPV6_H */