include/linux/ipv6.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _IPV6_H
   3 #define _IPV6_H
   4
   5 #include <uapi/linux/ipv6.h>
   6
   7 #define ipv6_optlen(p)  (((p)->hdrlen+1) << 3)
   8 #define ipv6_authlen(p) (((p)->hdrlen+2) << 2)
   9 /*
  10  * This structure contains configuration options per IPv6 link.
  11  */
  12 struct ipv6_devconf {
  13         __s32           forwarding;
  14         __s32           hop_limit;
  15         __s32           mtu6;
  16         __s32           accept_ra;
  17         __s32           accept_redirects;
  18         __s32           autoconf;
  19         __s32           dad_transmits;
  20         __s32           rtr_solicits;
  21         __s32           rtr_solicit_interval;
  22         __s32           rtr_solicit_max_interval;
  23         __s32           rtr_solicit_delay;
  24         __s32           force_mld_version;
  25         __s32           mldv1_unsolicited_report_interval;
  26         __s32           mldv2_unsolicited_report_interval;
  27         __s32           use_tempaddr;
  28         __s32           temp_valid_lft;
  29         __s32           temp_prefered_lft;
  30         __s32           regen_max_retry;
  31         __s32           max_desync_factor;
  32         __s32           max_addresses;
  33         __s32           accept_ra_defrtr;
  34         __u32           ra_defrtr_metric;
  35         __s32           accept_ra_min_hop_limit;
  36         __s32           accept_ra_pinfo;
  37         __s32           ignore_routes_with_linkdown;
  38 #ifdef CONFIG_IPV6_ROUTER_PREF
  39         __s32           accept_ra_rtr_pref;
  40         __s32           rtr_probe_interval;
  41 #ifdef CONFIG_IPV6_ROUTE_INFO
  42         __s32           accept_ra_rt_info_min_plen;
  43         __s32           accept_ra_rt_info_max_plen;
  44 #endif
  45 #endif
  46         __s32           proxy_ndp;
  47         __s32           accept_source_route;
  48         __s32           accept_ra_from_local;
  49 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
  50         __s32           optimistic_dad;
  51         __s32           use_optimistic;
  52 #endif
  53 #ifdef CONFIG_IPV6_MROUTE
  54         __s32           mc_forwarding;
  55 #endif
  56         __s32           disable_ipv6;
  57         __s32           drop_unicast_in_l2_multicast;
  58         __s32           accept_dad;
  59         __s32           force_tllao;
  60         __s32           ndisc_notify;
  61         __s32           suppress_frag_ndisc;
  62         __s32           accept_ra_mtu;
  63         __s32           drop_unsolicited_na;
  64         struct ipv6_stable_secret {
  65                 bool initialized;
  66                 struct in6_addr secret;
  67         } stable_secret;
  68         __s32           use_oif_addrs_only;
  69         __s32           keep_addr_on_down;
  70         __s32           seg6_enabled;
  71 #ifdef CONFIG_IPV6_SEG6_HMAC
  72         __s32           seg6_require_hmac;
  73 #endif
  74         __u32           enhanced_dad;
  75         __u32           addr_gen_mode;
  76         __s32           disable_policy;
  77         __s32           ndisc_tclass;
  78         __s32           rpl_seg_enabled;
  79         __u32           ioam6_id;
  80         __u32           ioam6_id_wide;
  81         __u8            ioam6_enabled;
  82
  83         struct ctl_table_header *sysctl_header;
  84 };
  85
  86 struct ipv6_params {
  87         __s32 disable_ipv6;
  88         __s32 autoconf;
  89 };
  90 extern struct ipv6_params ipv6_defaults;
  91 #include <linux/tcp.h>
  92 #include <linux/udp.h>
  93
  94 #include <net/inet_sock.h>
  95
  96 static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb)
  97 {
  98         return (struct ipv6hdr *)skb_network_header(skb);
  99 }
 100
 101 static inline struct ipv6hdr *inner_ipv6_hdr(const struct sk_buff *skb)
 102 {
 103         return (struct ipv6hdr *)skb_inner_network_header(skb);
 104 }
 105
 106 static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb)
 107 {
 108         return (struct ipv6hdr *)skb_transport_header(skb);
 109 }
 110
 111 static inline unsigned int ipv6_transport_len(const struct sk_buff *skb)
 112 {
 113         return ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr) -
 114                skb_network_header_len(skb);
 115 }
 116
 117 /*
 118    This structure contains results of exthdrs parsing
 119    as offsets from skb->nh.
 120  */
 121
 122 struct inet6_skb_parm {
 123         int                     iif;
 124         __be16                  ra;
 125         __u16                   dst0;
 126         __u16                   srcrt;
 127         __u16                   dst1;
 128         __u16                   lastopt;
 129         __u16                   nhoff;
 130         __u16                   flags;
 131 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
 132         __u16                   dsthao;
 133 #endif
 134         __u16                   frag_max_size;
 135
 136 #define IP6SKB_XFRM_TRANSFORMED 1
 137 #define IP6SKB_FORWARDED        2
 138 #define IP6SKB_REROUTED         4
 139 #define IP6SKB_ROUTERALERT      8
 140 #define IP6SKB_FRAGMENTED      16
 141 #define IP6SKB_HOPBYHOP        32
 142 #define IP6SKB_L3SLAVE         64
 143 #define IP6SKB_JUMBOGRAM      128
 144 };
 145
 146 #if defined(CONFIG_NET_L3_MASTER_DEV)
 147 static inline bool ipv6_l3mdev_skb(__u16 flags)
 148 {
 149         return flags & IP6SKB_L3SLAVE;
 150 }
 151 #else
 152 static inline bool ipv6_l3mdev_skb(__u16 flags)
 153 {
 154         return false;
 155 }
 156 #endif
 157
 158 #define IP6CB(skb)      ((struct inet6_skb_parm*)((skb)->cb))
 159 #define IP6CBMTU(skb)   ((struct ip6_mtuinfo *)((skb)->cb))
 160
 161 static inline int inet6_iif(const struct sk_buff *skb)
 162 {
 163         bool l3_slave = ipv6_l3mdev_skb(IP6CB(skb)->flags);
 164
 165         return l3_slave ? skb->skb_iif : IP6CB(skb)->iif;
 166 }
 167
 168 static inline bool inet6_is_jumbogram(const struct sk_buff *skb)
 169 {
 170         return !!(IP6CB(skb)->flags & IP6SKB_JUMBOGRAM);
 171 }
 172
 173 /* can not be used in TCP layer after tcp_v6_fill_cb */
 174 static inline int inet6_sdif(const struct sk_buff *skb)
 175 {
 176 #if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV)
 177         if (skb && ipv6_l3mdev_skb(IP6CB(skb)->flags))
 178                 return IP6CB(skb)->iif;
 179 #endif
 180         return 0;
 181 }
 182
 183 struct tcp6_request_sock {
 184         struct tcp_request_sock   tcp6rsk_tcp;
 185 };
 186
 187 struct ipv6_mc_socklist;
 188 struct ipv6_ac_socklist;
 189 struct ipv6_fl_socklist;
 190
 191 struct inet6_cork {
 192         struct ipv6_txoptions *opt;
 193         u8 hop_limit;
 194         u8 tclass;
 195 };
 196
 197 /**
 198  * struct ipv6_pinfo - ipv6 private area
 199  *
 200  * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc)
 201  * this _must_ be the last member, so that inet6_sk_generic
 202  * is able to calculate its offset from the base struct sock
 203  * by using the struct proto->slab_obj_size member. -acme
 204  */
 205 struct ipv6_pinfo {
 206         struct in6_addr         saddr;
 207         struct in6_pktinfo      sticky_pktinfo;
 208         const struct in6_addr           *daddr_cache;
 209 #ifdef CONFIG_IPV6_SUBTREES
 210         const struct in6_addr           *saddr_cache;
 211 #endif
 212
 213         __be32                  flow_label;
 214         __u32                   frag_size;
 215
 216         /*
 217          * Packed in 16bits.
 218          * Omit one shift by putting the signed field at MSB.
 219          */
 220 #if defined(__BIG_ENDIAN_BITFIELD)
 221         __s16                   hop_limit:9;
 222         __u16                   __unused_1:7;
 223 #else
 224         __u16                   __unused_1:7;
 225         __s16                   hop_limit:9;
 226 #endif
 227
 228 #if defined(__BIG_ENDIAN_BITFIELD)
 229         /* Packed in 16bits. */
 230         __s16                   mcast_hops:9;
 231         __u16                   __unused_2:6,
 232                                 mc_loop:1;
 233 #else
 234         __u16                   mc_loop:1,
 235                                 __unused_2:6;
 236         __s16                   mcast_hops:9;
 237 #endif
 238         int                     ucast_oif;
 239         int                     mcast_oif;
 240
 241         /* pktoption flags */
 242         union {
 243                 struct {
 244                         __u16   srcrt:1,
 245                                 osrcrt:1,
 246                                 rxinfo:1,
 247                                 rxoinfo:1,
 248                                 rxhlim:1,
 249                                 rxohlim:1,
 250                                 hopopts:1,
 251                                 ohopopts:1,
 252                                 dstopts:1,
 253                                 odstopts:1,
 254                                 rxflow:1,
 255                                 rxtclass:1,
 256                                 rxpmtu:1,
 257                                 rxorigdstaddr:1,
 258                                 recvfragsize:1;
 259                                 /* 1 bits hole */
 260                 } bits;
 261                 __u16           all;
 262         } rxopt;
 263
 264         /* sockopt flags */
 265         __u16                   recverr:1,
 266                                 sndflow:1,
 267                                 repflow:1,
 268                                 pmtudisc:3,
 269                                 padding:1,      /* 1 bit hole */
 270                                 srcprefs:3,     /* 001: prefer temporary address
 271                                                  * 010: prefer public address
 272                                                  * 100: prefer care-of address
 273                                                  */
 274                                 dontfrag:1,
 275                                 autoflowlabel:1,
 276                                 autoflowlabel_set:1,
 277                                 mc_all:1,
 278                                 recverr_rfc4884:1,
 279                                 rtalert_isolate:1;
 280         __u8                    min_hopcount;
 281         __u8                    tclass;
 282         __be32                  rcv_flowinfo;
 283
 284         __u32                   dst_cookie;
 285         __u32                   rx_dst_cookie;
 286
 287         struct ipv6_mc_socklist __rcu *ipv6_mc_list;
 288         struct ipv6_ac_socklist *ipv6_ac_list;
 289         struct ipv6_fl_socklist __rcu *ipv6_fl_list;
 290
 291         struct ipv6_txoptions __rcu     *opt;
 292         struct sk_buff          *pktoptions;
 293         struct sk_buff          *rxpmtu;
 294         struct inet6_cork       cork;
 295 };
 296
 297 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
 298 struct raw6_sock {
 299         /* inet_sock has to be the first member of raw6_sock */
 300         struct inet_sock        inet;
 301         __u32                   checksum;       /* perform checksum */
 302         __u32                   offset;         /* checksum offset  */
 303         struct icmp6_filter     filter;
 304         __u32                   ip6mr_table;
 305         /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */
 306         struct ipv6_pinfo       inet6;
 307 };
 308
 309 struct udp6_sock {
 310         struct udp_sock   udp;
 311         /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */
 312         struct ipv6_pinfo inet6;
 313 };
 314
 315 struct tcp6_sock {
 316         struct tcp_sock   tcp;
 317         /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */
 318         struct ipv6_pinfo inet6;
 319 };
 320
 321 extern int inet6_sk_rebuild_header(struct sock *sk);
 322
 323 struct tcp6_timewait_sock {
 324         struct tcp_timewait_sock   tcp6tw_tcp;
 325 };
 326
 327 #if IS_ENABLED(CONFIG_IPV6)
 328 bool ipv6_mod_enabled(void);
 329
 330 static inline struct ipv6_pinfo *inet6_sk(const struct sock *__sk)
 331 {
 332         return sk_fullsock(__sk) ? inet_sk(__sk)->pinet6 : NULL;
 333 }
 334
 335 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
 336 {
 337         return (struct raw6_sock *)sk;
 338 }
 339
 340 #define __ipv6_only_sock(sk)    (sk->sk_ipv6only)
 341 #define ipv6_only_sock(sk)      (__ipv6_only_sock(sk))
 342 #define ipv6_sk_rxinfo(sk)      ((sk)->sk_family == PF_INET6 && \
 343                                  inet6_sk(sk)->rxopt.bits.rxinfo)
 344
 345 static inline const struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
 346 {
 347         if (sk->sk_family == AF_INET6)
 348                 return &sk->sk_v6_rcv_saddr;
 349         return NULL;
 350 }
 351
 352 static inline int inet_v6_ipv6only(const struct sock *sk)
 353 {
 354         /* ipv6only field is at same position for timewait and other sockets */
 355         return ipv6_only_sock(sk);
 356 }
 357 #else
 358 #define __ipv6_only_sock(sk)    0
 359 #define ipv6_only_sock(sk)      0
 360 #define ipv6_sk_rxinfo(sk)      0
 361
 362 static inline bool ipv6_mod_enabled(void)
 363 {
 364         return false;
 365 }
 366
 367 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
 368 {
 369         return NULL;
 370 }
 371
 372 static inline struct inet6_request_sock *
 373                         inet6_rsk(const struct request_sock *rsk)
 374 {
 375         return NULL;
 376 }
 377
 378 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
 379 {
 380         return NULL;
 381 }
 382
 383 #define inet6_rcv_saddr(__sk)   NULL
 384 #define tcp_twsk_ipv6only(__sk)         0
 385 #define inet_v6_ipv6only(__sk)          0
 386 #endif /* IS_ENABLED(CONFIG_IPV6) */
 387 #endif /* _IPV6_H */