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