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         __s32           accept_ra_min_hop_limit;
  35         __s32           accept_ra_pinfo;
  36         __s32           ignore_routes_with_linkdown;
  37 #ifdef CONFIG_IPV6_ROUTER_PREF
  38         __s32           accept_ra_rtr_pref;
  39         __s32           rtr_probe_interval;
  40 #ifdef CONFIG_IPV6_ROUTE_INFO
  41         __s32           accept_ra_rt_info_min_plen;
  42         __s32           accept_ra_rt_info_max_plen;
  43 #endif
  44 #endif
  45         __s32           proxy_ndp;
  46         __s32           accept_source_route;
  47         __s32           accept_ra_from_local;
  48 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
  49         __s32           optimistic_dad;
  50         __s32           use_optimistic;
  51 #endif
  52 #ifdef CONFIG_IPV6_MROUTE
  53         __s32           mc_forwarding;
  54 #endif
  55         __s32           disable_ipv6;
  56         __s32           drop_unicast_in_l2_multicast;
  57         __s32           accept_dad;
  58         __s32           force_tllao;
  59         __s32           ndisc_notify;
  60         __s32           suppress_frag_ndisc;
  61         __s32           accept_ra_mtu;
  62         __s32           drop_unsolicited_na;
  63         struct ipv6_stable_secret {
  64                 bool initialized;
  65                 struct in6_addr secret;
  66         } stable_secret;
  67         __s32           use_oif_addrs_only;
  68         __s32           keep_addr_on_down;
  69         __s32           seg6_enabled;
  70 #ifdef CONFIG_IPV6_SEG6_HMAC
  71         __s32           seg6_require_hmac;
  72 #endif
  73         __u32           enhanced_dad;
  74         __u32           addr_gen_mode;
  75         __s32           disable_policy;
  76
  77         struct ctl_table_header *sysctl_header;
  78 };
  79
  80 struct ipv6_params {
  81         __s32 disable_ipv6;
  82         __s32 autoconf;
  83 };
  84 extern struct ipv6_params ipv6_defaults;
  85 #include <linux/icmpv6.h>
  86 #include <linux/tcp.h>
  87 #include <linux/udp.h>
  88
  89 #include <net/inet_sock.h>
  90
  91 static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb)
  92 {
  93         return (struct ipv6hdr *)skb_network_header(skb);
  94 }
  95
  96 static inline struct ipv6hdr *inner_ipv6_hdr(const struct sk_buff *skb)
  97 {
  98         return (struct ipv6hdr *)skb_inner_network_header(skb);
  99 }
 100
 101 static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb)
 102 {
 103         return (struct ipv6hdr *)skb_transport_header(skb);
 104 }
 105
 106 /*
 107    This structure contains results of exthdrs parsing
 108    as offsets from skb->nh.
 109  */
 110
 111 struct inet6_skb_parm {
 112         int                     iif;
 113         __be16                  ra;
 114         __u16                   dst0;
 115         __u16                   srcrt;
 116         __u16                   dst1;
 117         __u16                   lastopt;
 118         __u16                   nhoff;
 119         __u16                   flags;
 120 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
 121         __u16                   dsthao;
 122 #endif
 123         __u16                   frag_max_size;
 124
 125 #define IP6SKB_XFRM_TRANSFORMED 1
 126 #define IP6SKB_FORWARDED        2
 127 #define IP6SKB_REROUTED         4
 128 #define IP6SKB_ROUTERALERT      8
 129 #define IP6SKB_FRAGMENTED      16
 130 #define IP6SKB_HOPBYHOP        32
 131 #define IP6SKB_L3SLAVE         64
 132 #define IP6SKB_JUMBOGRAM      128
 133 };
 134
 135 #if defined(CONFIG_NET_L3_MASTER_DEV)
 136 static inline bool ipv6_l3mdev_skb(__u16 flags)
 137 {
 138         return flags & IP6SKB_L3SLAVE;
 139 }
 140 #else
 141 static inline bool ipv6_l3mdev_skb(__u16 flags)
 142 {
 143         return false;
 144 }
 145 #endif
 146
 147 #define IP6CB(skb)      ((struct inet6_skb_parm*)((skb)->cb))
 148 #define IP6CBMTU(skb)   ((struct ip6_mtuinfo *)((skb)->cb))
 149
 150 static inline int inet6_iif(const struct sk_buff *skb)
 151 {
 152         bool l3_slave = ipv6_l3mdev_skb(IP6CB(skb)->flags);
 153
 154         return l3_slave ? skb->skb_iif : IP6CB(skb)->iif;
 155 }
 156
 157 static inline bool inet6_is_jumbogram(const struct sk_buff *skb)
 158 {
 159         return !!(IP6CB(skb)->flags & IP6SKB_JUMBOGRAM);
 160 }
 161
 162 /* can not be used in TCP layer after tcp_v6_fill_cb */
 163 static inline int inet6_sdif(const struct sk_buff *skb)
 164 {
 165 #if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV)
 166         if (skb && ipv6_l3mdev_skb(IP6CB(skb)->flags))
 167                 return IP6CB(skb)->iif;
 168 #endif
 169         return 0;
 170 }
 171
 172 /* can not be used in TCP layer after tcp_v6_fill_cb */
 173 static inline bool inet6_exact_dif_match(struct net *net, struct sk_buff *skb)
 174 {
 175 #if defined(CONFIG_NET_L3_MASTER_DEV)
 176         if (!net->ipv4.sysctl_tcp_l3mdev_accept &&
 177             skb && ipv6_l3mdev_skb(IP6CB(skb)->flags))
 178                 return true;
 179 #endif
 180         return false;
 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 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         __u8                    min_hopcount;
 277         __u8                    tclass;
 278         __be32                  rcv_flowinfo;
 279
 280         __u32                   dst_cookie;
 281         __u32                   rx_dst_cookie;
 282
 283         struct ipv6_mc_socklist __rcu *ipv6_mc_list;
 284         struct ipv6_ac_socklist *ipv6_ac_list;
 285         struct ipv6_fl_socklist __rcu *ipv6_fl_list;
 286
 287         struct ipv6_txoptions __rcu     *opt;
 288         struct sk_buff          *pktoptions;
 289         struct sk_buff          *rxpmtu;
 290         struct inet6_cork       cork;
 291 };
 292
 293 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
 294 struct raw6_sock {
 295         /* inet_sock has to be the first member of raw6_sock */
 296         struct inet_sock        inet;
 297         __u32                   checksum;       /* perform checksum */
 298         __u32                   offset;         /* checksum offset  */
 299         struct icmp6_filter     filter;
 300         __u32                   ip6mr_table;
 301         /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */
 302         struct ipv6_pinfo       inet6;
 303 };
 304
 305 struct udp6_sock {
 306         struct udp_sock   udp;
 307         /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */
 308         struct ipv6_pinfo inet6;
 309 };
 310
 311 struct tcp6_sock {
 312         struct tcp_sock   tcp;
 313         /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */
 314         struct ipv6_pinfo inet6;
 315 };
 316
 317 extern int inet6_sk_rebuild_header(struct sock *sk);
 318
 319 struct tcp6_timewait_sock {
 320         struct tcp_timewait_sock   tcp6tw_tcp;
 321 };
 322
 323 #if IS_ENABLED(CONFIG_IPV6)
 324 bool ipv6_mod_enabled(void);
 325
 326 static inline struct ipv6_pinfo *inet6_sk(const struct sock *__sk)
 327 {
 328         return sk_fullsock(__sk) ? inet_sk(__sk)->pinet6 : NULL;
 329 }
 330
 331 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
 332 {
 333         return (struct raw6_sock *)sk;
 334 }
 335
 336 static inline void inet_sk_copy_descendant(struct sock *sk_to,
 337                                            const struct sock *sk_from)
 338 {
 339         int ancestor_size = sizeof(struct inet_sock);
 340
 341         if (sk_from->sk_family == PF_INET6)
 342                 ancestor_size += sizeof(struct ipv6_pinfo);
 343
 344         __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
 345 }
 346
 347 #define __ipv6_only_sock(sk)    (sk->sk_ipv6only)
 348 #define ipv6_only_sock(sk)      (__ipv6_only_sock(sk))
 349 #define ipv6_sk_rxinfo(sk)      ((sk)->sk_family == PF_INET6 && \
 350                                  inet6_sk(sk)->rxopt.bits.rxinfo)
 351
 352 static inline const struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
 353 {
 354         if (sk->sk_family == AF_INET6)
 355                 return &sk->sk_v6_rcv_saddr;
 356         return NULL;
 357 }
 358
 359 static inline int inet_v6_ipv6only(const struct sock *sk)
 360 {
 361         /* ipv6only field is at same position for timewait and other sockets */
 362         return ipv6_only_sock(sk);
 363 }
 364 #else
 365 #define __ipv6_only_sock(sk)    0
 366 #define ipv6_only_sock(sk)      0
 367 #define ipv6_sk_rxinfo(sk)      0
 368
 369 static inline bool ipv6_mod_enabled(void)
 370 {
 371         return false;
 372 }
 373
 374 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
 375 {
 376         return NULL;
 377 }
 378
 379 static inline struct inet6_request_sock *
 380                         inet6_rsk(const struct request_sock *rsk)
 381 {
 382         return NULL;
 383 }
 384
 385 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
 386 {
 387         return NULL;
 388 }
 389
 390 #define inet6_rcv_saddr(__sk)   NULL
 391 #define tcp_twsk_ipv6only(__sk)         0
 392 #define inet_v6_ipv6only(__sk)          0
 393 #endif /* IS_ENABLED(CONFIG_IPV6) */
 394 #endif /* _IPV6_H */