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 static inline unsigned int ipv6_transport_len(const struct sk_buff *skb)
 108 {
 109         return ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr) -
 110                skb_network_header_len(skb);
 111 }
 112
 113 /*
 114    This structure contains results of exthdrs parsing
 115    as offsets from skb->nh.
 116  */
 117
 118 struct inet6_skb_parm {
 119         int                     iif;
 120         __be16                  ra;
 121         __u16                   dst0;
 122         __u16                   srcrt;
 123         __u16                   dst1;
 124         __u16                   lastopt;
 125         __u16                   nhoff;
 126         __u16                   flags;
 127 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
 128         __u16                   dsthao;
 129 #endif
 130         __u16                   frag_max_size;
 131
 132 #define IP6SKB_XFRM_TRANSFORMED 1
 133 #define IP6SKB_FORWARDED        2
 134 #define IP6SKB_REROUTED         4
 135 #define IP6SKB_ROUTERALERT      8
 136 #define IP6SKB_FRAGMENTED      16
 137 #define IP6SKB_HOPBYHOP        32
 138 #define IP6SKB_L3SLAVE         64
 139 #define IP6SKB_JUMBOGRAM      128
 140 };
 141
 142 #if defined(CONFIG_NET_L3_MASTER_DEV)
 143 static inline bool ipv6_l3mdev_skb(__u16 flags)
 144 {
 145         return flags & IP6SKB_L3SLAVE;
 146 }
 147 #else
 148 static inline bool ipv6_l3mdev_skb(__u16 flags)
 149 {
 150         return false;
 151 }
 152 #endif
 153
 154 #define IP6CB(skb)      ((struct inet6_skb_parm*)((skb)->cb))
 155 #define IP6CBMTU(skb)   ((struct ip6_mtuinfo *)((skb)->cb))
 156
 157 static inline int inet6_iif(const struct sk_buff *skb)
 158 {
 159         bool l3_slave = ipv6_l3mdev_skb(IP6CB(skb)->flags);
 160
 161         return l3_slave ? skb->skb_iif : IP6CB(skb)->iif;
 162 }
 163
 164 static inline bool inet6_is_jumbogram(const struct sk_buff *skb)
 165 {
 166         return !!(IP6CB(skb)->flags & IP6SKB_JUMBOGRAM);
 167 }
 168
 169 /* can not be used in TCP layer after tcp_v6_fill_cb */
 170 static inline int inet6_sdif(const struct sk_buff *skb)
 171 {
 172 #if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV)
 173         if (skb && ipv6_l3mdev_skb(IP6CB(skb)->flags))
 174                 return IP6CB(skb)->iif;
 175 #endif
 176         return 0;
 177 }
 178
 179 /* can not be used in TCP layer after tcp_v6_fill_cb */
 180 static inline bool inet6_exact_dif_match(struct net *net, struct sk_buff *skb)
 181 {
 182 #if defined(CONFIG_NET_L3_MASTER_DEV)
 183         if (!net->ipv4.sysctl_tcp_l3mdev_accept &&
 184             skb && ipv6_l3mdev_skb(IP6CB(skb)->flags))
 185                 return true;
 186 #endif
 187         return false;
 188 }
 189
 190 struct tcp6_request_sock {
 191         struct tcp_request_sock   tcp6rsk_tcp;
 192 };
 193
 194 struct ipv6_mc_socklist;
 195 struct ipv6_ac_socklist;
 196 struct ipv6_fl_socklist;
 197
 198 struct inet6_cork {
 199         struct ipv6_txoptions *opt;
 200         u8 hop_limit;
 201         u8 tclass;
 202 };
 203
 204 /**
 205  * struct ipv6_pinfo - ipv6 private area
 206  *
 207  * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc)
 208  * this _must_ be the last member, so that inet6_sk_generic
 209  * is able to calculate its offset from the base struct sock
 210  * by using the struct proto->slab_obj_size member. -acme
 211  */
 212 struct ipv6_pinfo {
 213         struct in6_addr         saddr;
 214         struct in6_pktinfo      sticky_pktinfo;
 215         const struct in6_addr           *daddr_cache;
 216 #ifdef CONFIG_IPV6_SUBTREES
 217         const struct in6_addr           *saddr_cache;
 218 #endif
 219
 220         __be32                  flow_label;
 221         __u32                   frag_size;
 222
 223         /*
 224          * Packed in 16bits.
 225          * Omit one shift by by putting the signed field at MSB.
 226          */
 227 #if defined(__BIG_ENDIAN_BITFIELD)
 228         __s16                   hop_limit:9;
 229         __u16                   __unused_1:7;
 230 #else
 231         __u16                   __unused_1:7;
 232         __s16                   hop_limit:9;
 233 #endif
 234
 235 #if defined(__BIG_ENDIAN_BITFIELD)
 236         /* Packed in 16bits. */
 237         __s16                   mcast_hops:9;
 238         __u16                   __unused_2:6,
 239                                 mc_loop:1;
 240 #else
 241         __u16                   mc_loop:1,
 242                                 __unused_2:6;
 243         __s16                   mcast_hops:9;
 244 #endif
 245         int                     ucast_oif;
 246         int                     mcast_oif;
 247
 248         /* pktoption flags */
 249         union {
 250                 struct {
 251                         __u16   srcrt:1,
 252                                 osrcrt:1,
 253                                 rxinfo:1,
 254                                 rxoinfo:1,
 255                                 rxhlim:1,
 256                                 rxohlim:1,
 257                                 hopopts:1,
 258                                 ohopopts:1,
 259                                 dstopts:1,
 260                                 odstopts:1,
 261                                 rxflow:1,
 262                                 rxtclass:1,
 263                                 rxpmtu:1,
 264                                 rxorigdstaddr:1,
 265                                 recvfragsize:1;
 266                                 /* 1 bits hole */
 267                 } bits;
 268                 __u16           all;
 269         } rxopt;
 270
 271         /* sockopt flags */
 272         __u16                   recverr:1,
 273                                 sndflow:1,
 274                                 repflow:1,
 275                                 pmtudisc:3,
 276                                 padding:1,      /* 1 bit hole */
 277                                 srcprefs:3,     /* 001: prefer temporary address
 278                                                  * 010: prefer public address
 279                                                  * 100: prefer care-of address
 280                                                  */
 281                                 dontfrag:1,
 282                                 autoflowlabel:1,
 283                                 autoflowlabel_set:1,
 284                                 mc_all:1,
 285                                 rtalert_isolate:1;
 286         __u8                    min_hopcount;
 287         __u8                    tclass;
 288         __be32                  rcv_flowinfo;
 289
 290         __u32                   dst_cookie;
 291         __u32                   rx_dst_cookie;
 292
 293         struct ipv6_mc_socklist __rcu *ipv6_mc_list;
 294         struct ipv6_ac_socklist *ipv6_ac_list;
 295         struct ipv6_fl_socklist __rcu *ipv6_fl_list;
 296
 297         struct ipv6_txoptions __rcu     *opt;
 298         struct sk_buff          *pktoptions;
 299         struct sk_buff          *rxpmtu;
 300         struct inet6_cork       cork;
 301 };
 302
 303 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
 304 struct raw6_sock {
 305         /* inet_sock has to be the first member of raw6_sock */
 306         struct inet_sock        inet;
 307         __u32                   checksum;       /* perform checksum */
 308         __u32                   offset;         /* checksum offset  */
 309         struct icmp6_filter     filter;
 310         __u32                   ip6mr_table;
 311         /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */
 312         struct ipv6_pinfo       inet6;
 313 };
 314
 315 struct udp6_sock {
 316         struct udp_sock   udp;
 317         /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */
 318         struct ipv6_pinfo inet6;
 319 };
 320
 321 struct tcp6_sock {
 322         struct tcp_sock   tcp;
 323         /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */
 324         struct ipv6_pinfo inet6;
 325 };
 326
 327 extern int inet6_sk_rebuild_header(struct sock *sk);
 328
 329 struct tcp6_timewait_sock {
 330         struct tcp_timewait_sock   tcp6tw_tcp;
 331 };
 332
 333 #if IS_ENABLED(CONFIG_IPV6)
 334 bool ipv6_mod_enabled(void);
 335
 336 static inline struct ipv6_pinfo *inet6_sk(const struct sock *__sk)
 337 {
 338         return sk_fullsock(__sk) ? inet_sk(__sk)->pinet6 : NULL;
 339 }
 340
 341 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
 342 {
 343         return (struct raw6_sock *)sk;
 344 }
 345
 346 static inline void inet_sk_copy_descendant(struct sock *sk_to,
 347                                            const struct sock *sk_from)
 348 {
 349         int ancestor_size = sizeof(struct inet_sock);
 350
 351         if (sk_from->sk_family == PF_INET6)
 352                 ancestor_size += sizeof(struct ipv6_pinfo);
 353
 354         __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
 355 }
 356
 357 #define __ipv6_only_sock(sk)    (sk->sk_ipv6only)
 358 #define ipv6_only_sock(sk)      (__ipv6_only_sock(sk))
 359 #define ipv6_sk_rxinfo(sk)      ((sk)->sk_family == PF_INET6 && \
 360                                  inet6_sk(sk)->rxopt.bits.rxinfo)
 361
 362 static inline const struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
 363 {
 364         if (sk->sk_family == AF_INET6)
 365                 return &sk->sk_v6_rcv_saddr;
 366         return NULL;
 367 }
 368
 369 static inline int inet_v6_ipv6only(const struct sock *sk)
 370 {
 371         /* ipv6only field is at same position for timewait and other sockets */
 372         return ipv6_only_sock(sk);
 373 }
 374 #else
 375 #define __ipv6_only_sock(sk)    0
 376 #define ipv6_only_sock(sk)      0
 377 #define ipv6_sk_rxinfo(sk)      0
 378
 379 static inline bool ipv6_mod_enabled(void)
 380 {
 381         return false;
 382 }
 383
 384 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
 385 {
 386         return NULL;
 387 }
 388
 389 static inline struct inet6_request_sock *
 390                         inet6_rsk(const struct request_sock *rsk)
 391 {
 392         return NULL;
 393 }
 394
 395 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
 396 {
 397         return NULL;
 398 }
 399
 400 #define inet6_rcv_saddr(__sk)   NULL
 401 #define tcp_twsk_ipv6only(__sk)         0
 402 #define inet_v6_ipv6only(__sk)          0
 403 #endif /* IS_ENABLED(CONFIG_IPV6) */
 404 #endif /* _IPV6_H */