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         __s32           ndisc_tclass;
  77
  78         struct ctl_table_header *sysctl_header;
  79 };
  80
  81 struct ipv6_params {
  82         __s32 disable_ipv6;
  83         __s32 autoconf;
  84 };
  85 extern struct ipv6_params ipv6_defaults;
  86 #include <linux/icmpv6.h>
  87 #include <linux/tcp.h>
  88 #include <linux/udp.h>
  89
  90 #include <net/inet_sock.h>
  91
  92 static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb)
  93 {
  94         return (struct ipv6hdr *)skb_network_header(skb);
  95 }
  96
  97 static inline struct ipv6hdr *inner_ipv6_hdr(const struct sk_buff *skb)
  98 {
  99         return (struct ipv6hdr *)skb_inner_network_header(skb);
 100 }
 101
 102 static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb)
 103 {
 104         return (struct ipv6hdr *)skb_transport_header(skb);
 105 }
 106
 107 /*
 108    This structure contains results of exthdrs parsing
 109    as offsets from skb->nh.
 110  */
 111
 112 struct inet6_skb_parm {
 113         int                     iif;
 114         __be16                  ra;
 115         __u16                   dst0;
 116         __u16                   srcrt;
 117         __u16                   dst1;
 118         __u16                   lastopt;
 119         __u16                   nhoff;
 120         __u16                   flags;
 121 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
 122         __u16                   dsthao;
 123 #endif
 124         __u16                   frag_max_size;
 125
 126 #define IP6SKB_XFRM_TRANSFORMED 1
 127 #define IP6SKB_FORWARDED        2
 128 #define IP6SKB_REROUTED         4
 129 #define IP6SKB_ROUTERALERT      8
 130 #define IP6SKB_FRAGMENTED      16
 131 #define IP6SKB_HOPBYHOP        32
 132 #define IP6SKB_L3SLAVE         64
 133 #define IP6SKB_JUMBOGRAM      128
 134 };
 135
 136 #if defined(CONFIG_NET_L3_MASTER_DEV)
 137 static inline bool ipv6_l3mdev_skb(__u16 flags)
 138 {
 139         return flags & IP6SKB_L3SLAVE;
 140 }
 141 #else
 142 static inline bool ipv6_l3mdev_skb(__u16 flags)
 143 {
 144         return false;
 145 }
 146 #endif
 147
 148 #define IP6CB(skb)      ((struct inet6_skb_parm*)((skb)->cb))
 149 #define IP6CBMTU(skb)   ((struct ip6_mtuinfo *)((skb)->cb))
 150
 151 static inline int inet6_iif(const struct sk_buff *skb)
 152 {
 153         bool l3_slave = ipv6_l3mdev_skb(IP6CB(skb)->flags);
 154
 155         return l3_slave ? skb->skb_iif : IP6CB(skb)->iif;
 156 }
 157
 158 static inline bool inet6_is_jumbogram(const struct sk_buff *skb)
 159 {
 160         return !!(IP6CB(skb)->flags & IP6SKB_JUMBOGRAM);
 161 }
 162
 163 /* can not be used in TCP layer after tcp_v6_fill_cb */
 164 static inline int inet6_sdif(const struct sk_buff *skb)
 165 {
 166 #if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV)
 167         if (skb && ipv6_l3mdev_skb(IP6CB(skb)->flags))
 168                 return IP6CB(skb)->iif;
 169 #endif
 170         return 0;
 171 }
 172
 173 /* can not be used in TCP layer after tcp_v6_fill_cb */
 174 static inline bool inet6_exact_dif_match(struct net *net, struct sk_buff *skb)
 175 {
 176 #if defined(CONFIG_NET_L3_MASTER_DEV)
 177         if (!net->ipv4.sysctl_tcp_l3mdev_accept &&
 178             skb && ipv6_l3mdev_skb(IP6CB(skb)->flags))
 179                 return true;
 180 #endif
 181         return false;
 182 }
 183
 184 struct tcp6_request_sock {
 185         struct tcp_request_sock   tcp6rsk_tcp;
 186 };
 187
 188 struct ipv6_mc_socklist;
 189 struct ipv6_ac_socklist;
 190 struct ipv6_fl_socklist;
 191
 192 struct inet6_cork {
 193         struct ipv6_txoptions *opt;
 194         u8 hop_limit;
 195         u8 tclass;
 196 };
 197
 198 /**
 199  * struct ipv6_pinfo - ipv6 private area
 200  *
 201  * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc)
 202  * this _must_ be the last member, so that inet6_sk_generic
 203  * is able to calculate its offset from the base struct sock
 204  * by using the struct proto->slab_obj_size member. -acme
 205  */
 206 struct ipv6_pinfo {
 207         struct in6_addr         saddr;
 208         struct in6_pktinfo      sticky_pktinfo;
 209         const struct in6_addr           *daddr_cache;
 210 #ifdef CONFIG_IPV6_SUBTREES
 211         const struct in6_addr           *saddr_cache;
 212 #endif
 213
 214         __be32                  flow_label;
 215         __u32                   frag_size;
 216
 217         /*
 218          * Packed in 16bits.
 219          * Omit one shift by by putting the signed field at MSB.
 220          */
 221 #if defined(__BIG_ENDIAN_BITFIELD)
 222         __s16                   hop_limit:9;
 223         __u16                   __unused_1:7;
 224 #else
 225         __u16                   __unused_1:7;
 226         __s16                   hop_limit:9;
 227 #endif
 228
 229 #if defined(__BIG_ENDIAN_BITFIELD)
 230         /* Packed in 16bits. */
 231         __s16                   mcast_hops:9;
 232         __u16                   __unused_2:6,
 233                                 mc_loop:1;
 234 #else
 235         __u16                   mc_loop:1,
 236                                 __unused_2:6;
 237         __s16                   mcast_hops:9;
 238 #endif
 239         int                     ucast_oif;
 240         int                     mcast_oif;
 241
 242         /* pktoption flags */
 243         union {
 244                 struct {
 245                         __u16   srcrt:1,
 246                                 osrcrt:1,
 247                                 rxinfo:1,
 248                                 rxoinfo:1,
 249                                 rxhlim:1,
 250                                 rxohlim:1,
 251                                 hopopts:1,
 252                                 ohopopts:1,
 253                                 dstopts:1,
 254                                 odstopts:1,
 255                                 rxflow:1,
 256                                 rxtclass:1,
 257                                 rxpmtu:1,
 258                                 rxorigdstaddr:1,
 259                                 recvfragsize:1;
 260                                 /* 1 bits hole */
 261                 } bits;
 262                 __u16           all;
 263         } rxopt;
 264
 265         /* sockopt flags */
 266         __u16                   recverr:1,
 267                                 sndflow:1,
 268                                 repflow:1,
 269                                 pmtudisc:3,
 270                                 padding:1,      /* 1 bit hole */
 271                                 srcprefs:3,     /* 001: prefer temporary address
 272                                                  * 010: prefer public address
 273                                                  * 100: prefer care-of address
 274                                                  */
 275                                 dontfrag:1,
 276                                 autoflowlabel:1,
 277                                 autoflowlabel_set:1;
 278         __u8                    min_hopcount;
 279         __u8                    tclass;
 280         __be32                  rcv_flowinfo;
 281
 282         __u32                   dst_cookie;
 283         __u32                   rx_dst_cookie;
 284
 285         struct ipv6_mc_socklist __rcu *ipv6_mc_list;
 286         struct ipv6_ac_socklist *ipv6_ac_list;
 287         struct ipv6_fl_socklist __rcu *ipv6_fl_list;
 288
 289         struct ipv6_txoptions __rcu     *opt;
 290         struct sk_buff          *pktoptions;
 291         struct sk_buff          *rxpmtu;
 292         struct inet6_cork       cork;
 293 };
 294
 295 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
 296 struct raw6_sock {
 297         /* inet_sock has to be the first member of raw6_sock */
 298         struct inet_sock        inet;
 299         __u32                   checksum;       /* perform checksum */
 300         __u32                   offset;         /* checksum offset  */
 301         struct icmp6_filter     filter;
 302         __u32                   ip6mr_table;
 303         /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */
 304         struct ipv6_pinfo       inet6;
 305 };
 306
 307 struct udp6_sock {
 308         struct udp_sock   udp;
 309         /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */
 310         struct ipv6_pinfo inet6;
 311 };
 312
 313 struct tcp6_sock {
 314         struct tcp_sock   tcp;
 315         /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */
 316         struct ipv6_pinfo inet6;
 317 };
 318
 319 extern int inet6_sk_rebuild_header(struct sock *sk);
 320
 321 struct tcp6_timewait_sock {
 322         struct tcp_timewait_sock   tcp6tw_tcp;
 323 };
 324
 325 #if IS_ENABLED(CONFIG_IPV6)
 326 bool ipv6_mod_enabled(void);
 327
 328 static inline struct ipv6_pinfo *inet6_sk(const struct sock *__sk)
 329 {
 330         return sk_fullsock(__sk) ? inet_sk(__sk)->pinet6 : NULL;
 331 }
 332
 333 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
 334 {
 335         return (struct raw6_sock *)sk;
 336 }
 337
 338 static inline void inet_sk_copy_descendant(struct sock *sk_to,
 339                                            const struct sock *sk_from)
 340 {
 341         int ancestor_size = sizeof(struct inet_sock);
 342
 343         if (sk_from->sk_family == PF_INET6)
 344                 ancestor_size += sizeof(struct ipv6_pinfo);
 345
 346         __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
 347 }
 348
 349 #define __ipv6_only_sock(sk)    (sk->sk_ipv6only)
 350 #define ipv6_only_sock(sk)      (__ipv6_only_sock(sk))
 351 #define ipv6_sk_rxinfo(sk)      ((sk)->sk_family == PF_INET6 && \
 352                                  inet6_sk(sk)->rxopt.bits.rxinfo)
 353
 354 static inline const struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
 355 {
 356         if (sk->sk_family == AF_INET6)
 357                 return &sk->sk_v6_rcv_saddr;
 358         return NULL;
 359 }
 360
 361 static inline int inet_v6_ipv6only(const struct sock *sk)
 362 {
 363         /* ipv6only field is at same position for timewait and other sockets */
 364         return ipv6_only_sock(sk);
 365 }
 366 #else
 367 #define __ipv6_only_sock(sk)    0
 368 #define ipv6_only_sock(sk)      0
 369 #define ipv6_sk_rxinfo(sk)      0
 370
 371 static inline bool ipv6_mod_enabled(void)
 372 {
 373         return false;
 374 }
 375
 376 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
 377 {
 378         return NULL;
 379 }
 380
 381 static inline struct inet6_request_sock *
 382                         inet6_rsk(const struct request_sock *rsk)
 383 {
 384         return NULL;
 385 }
 386
 387 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
 388 {
 389         return NULL;
 390 }
 391
 392 #define inet6_rcv_saddr(__sk)   NULL
 393 #define tcp_twsk_ipv6only(__sk)         0
 394 #define inet_v6_ipv6only(__sk)          0
 395 #endif /* IS_ENABLED(CONFIG_IPV6) */
 396 #endif /* _IPV6_H */