include/linux/ipv6.h

   1 #ifndef _IPV6_H
   2 #define _IPV6_H
   3
   4 #include <uapi/linux/ipv6.h>
   5
   6 #define ipv6_optlen(p)  (((p)->hdrlen+1) << 3)
   7 #define ipv6_authlen(p) (((p)->hdrlen+2) << 2)
   8 /*
   9  * This structure contains configuration options per IPv6 link.
  10  */
  11 struct ipv6_devconf {
  12         __s32           forwarding;
  13         __s32           hop_limit;
  14         __s32           mtu6;
  15         __s32           accept_ra;
  16         __s32           accept_redirects;
  17         __s32           autoconf;
  18         __s32           dad_transmits;
  19         __s32           rtr_solicits;
  20         __s32           rtr_solicit_interval;
  21         __s32           rtr_solicit_max_interval;
  22         __s32           rtr_solicit_delay;
  23         __s32           force_mld_version;
  24         __s32           mldv1_unsolicited_report_interval;
  25         __s32           mldv2_unsolicited_report_interval;
  26         __s32           use_tempaddr;
  27         __s32           temp_valid_lft;
  28         __s32           temp_prefered_lft;
  29         __s32           regen_max_retry;
  30         __s32           max_desync_factor;
  31         __s32           max_addresses;
  32         __s32           accept_ra_defrtr;
  33         __s32           accept_ra_min_hop_limit;
  34         __s32           accept_ra_pinfo;
  35         __s32           ignore_routes_with_linkdown;
  36 #ifdef CONFIG_IPV6_ROUTER_PREF
  37         __s32           accept_ra_rtr_pref;
  38         __s32           rtr_probe_interval;
  39 #ifdef CONFIG_IPV6_ROUTE_INFO
  40         __s32           accept_ra_rt_info_min_plen;
  41         __s32           accept_ra_rt_info_max_plen;
  42 #endif
  43 #endif
  44         __s32           proxy_ndp;
  45         __s32           accept_source_route;
  46         __s32           accept_ra_from_local;
  47 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
  48         __s32           optimistic_dad;
  49         __s32           use_optimistic;
  50 #endif
  51 #ifdef CONFIG_IPV6_MROUTE
  52         __s32           mc_forwarding;
  53 #endif
  54         __s32           disable_ipv6;
  55         __s32           drop_unicast_in_l2_multicast;
  56         __s32           accept_dad;
  57         __s32           force_tllao;
  58         __s32           ndisc_notify;
  59         __s32           suppress_frag_ndisc;
  60         __s32           accept_ra_mtu;
  61         __s32           drop_unsolicited_na;
  62         struct ipv6_stable_secret {
  63                 bool initialized;
  64                 struct in6_addr secret;
  65         } stable_secret;
  66         __s32           use_oif_addrs_only;
  67         __s32           keep_addr_on_down;
  68         __s32           seg6_enabled;
  69 #ifdef CONFIG_IPV6_SEG6_HMAC
  70         __s32           seg6_require_hmac;
  71 #endif
  72         __u32           enhanced_dad;
  73         __u32           addr_gen_mode;
  74         __s32           disable_policy;
  75
  76         struct ctl_table_header *sysctl_header;
  77 };
  78
  79 struct ipv6_params {
  80         __s32 disable_ipv6;
  81         __s32 autoconf;
  82 };
  83 extern struct ipv6_params ipv6_defaults;
  84 #include <linux/icmpv6.h>
  85 #include <linux/tcp.h>
  86 #include <linux/udp.h>
  87
  88 #include <net/inet_sock.h>
  89
  90 static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb)
  91 {
  92         return (struct ipv6hdr *)skb_network_header(skb);
  93 }
  94
  95 static inline struct ipv6hdr *inner_ipv6_hdr(const struct sk_buff *skb)
  96 {
  97         return (struct ipv6hdr *)skb_inner_network_header(skb);
  98 }
  99
 100 static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb)
 101 {
 102         return (struct ipv6hdr *)skb_transport_header(skb);
 103 }
 104
 105 /*
 106    This structure contains results of exthdrs parsing
 107    as offsets from skb->nh.
 108  */
 109
 110 struct inet6_skb_parm {
 111         int                     iif;
 112         __be16                  ra;
 113         __u16                   dst0;
 114         __u16                   srcrt;
 115         __u16                   dst1;
 116         __u16                   lastopt;
 117         __u16                   nhoff;
 118         __u16                   flags;
 119 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
 120         __u16                   dsthao;
 121 #endif
 122         __u16                   frag_max_size;
 123
 124 #define IP6SKB_XFRM_TRANSFORMED 1
 125 #define IP6SKB_FORWARDED        2
 126 #define IP6SKB_REROUTED         4
 127 #define IP6SKB_ROUTERALERT      8
 128 #define IP6SKB_FRAGMENTED      16
 129 #define IP6SKB_HOPBYHOP        32
 130 #define IP6SKB_L3SLAVE         64
 131 #define IP6SKB_JUMBOGRAM      128
 132 };
 133
 134 #if defined(CONFIG_NET_L3_MASTER_DEV)
 135 static inline bool ipv6_l3mdev_skb(__u16 flags)
 136 {
 137         return flags & IP6SKB_L3SLAVE;
 138 }
 139 #else
 140 static inline bool ipv6_l3mdev_skb(__u16 flags)
 141 {
 142         return false;
 143 }
 144 #endif
 145
 146 #define IP6CB(skb)      ((struct inet6_skb_parm*)((skb)->cb))
 147 #define IP6CBMTU(skb)   ((struct ip6_mtuinfo *)((skb)->cb))
 148
 149 static inline int inet6_iif(const struct sk_buff *skb)
 150 {
 151         bool l3_slave = ipv6_l3mdev_skb(IP6CB(skb)->flags);
 152
 153         return l3_slave ? skb->skb_iif : IP6CB(skb)->iif;
 154 }
 155
 156 static inline bool inet6_is_jumbogram(const struct sk_buff *skb)
 157 {
 158         return !!(IP6CB(skb)->flags & IP6SKB_JUMBOGRAM);
 159 }
 160
 161 /* can not be used in TCP layer after tcp_v6_fill_cb */
 162 static inline bool inet6_exact_dif_match(struct net *net, struct sk_buff *skb)
 163 {
 164 #if defined(CONFIG_NET_L3_MASTER_DEV)
 165         if (!net->ipv4.sysctl_tcp_l3mdev_accept &&
 166             skb && ipv6_l3mdev_skb(IP6CB(skb)->flags))
 167                 return true;
 168 #endif
 169         return false;
 170 }
 171
 172 struct tcp6_request_sock {
 173         struct tcp_request_sock   tcp6rsk_tcp;
 174 };
 175
 176 struct ipv6_mc_socklist;
 177 struct ipv6_ac_socklist;
 178 struct ipv6_fl_socklist;
 179
 180 struct inet6_cork {
 181         struct ipv6_txoptions *opt;
 182         u8 hop_limit;
 183         u8 tclass;
 184 };
 185
 186 /**
 187  * struct ipv6_pinfo - ipv6 private area
 188  *
 189  * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc)
 190  * this _must_ be the last member, so that inet6_sk_generic
 191  * is able to calculate its offset from the base struct sock
 192  * by using the struct proto->slab_obj_size member. -acme
 193  */
 194 struct ipv6_pinfo {
 195         struct in6_addr         saddr;
 196         struct in6_pktinfo      sticky_pktinfo;
 197         const struct in6_addr           *daddr_cache;
 198 #ifdef CONFIG_IPV6_SUBTREES
 199         const struct in6_addr           *saddr_cache;
 200 #endif
 201
 202         __be32                  flow_label;
 203         __u32                   frag_size;
 204
 205         /*
 206          * Packed in 16bits.
 207          * Omit one shift by by putting the signed field at MSB.
 208          */
 209 #if defined(__BIG_ENDIAN_BITFIELD)
 210         __s16                   hop_limit:9;
 211         __u16                   __unused_1:7;
 212 #else
 213         __u16                   __unused_1:7;
 214         __s16                   hop_limit:9;
 215 #endif
 216
 217 #if defined(__BIG_ENDIAN_BITFIELD)
 218         /* Packed in 16bits. */
 219         __s16                   mcast_hops:9;
 220         __u16                   __unused_2:6,
 221                                 mc_loop:1;
 222 #else
 223         __u16                   mc_loop:1,
 224                                 __unused_2:6;
 225         __s16                   mcast_hops:9;
 226 #endif
 227         int                     ucast_oif;
 228         int                     mcast_oif;
 229
 230         /* pktoption flags */
 231         union {
 232                 struct {
 233                         __u16   srcrt:1,
 234                                 osrcrt:1,
 235                                 rxinfo:1,
 236                                 rxoinfo:1,
 237                                 rxhlim:1,
 238                                 rxohlim:1,
 239                                 hopopts:1,
 240                                 ohopopts:1,
 241                                 dstopts:1,
 242                                 odstopts:1,
 243                                 rxflow:1,
 244                                 rxtclass:1,
 245                                 rxpmtu:1,
 246                                 rxorigdstaddr:1,
 247                                 recvfragsize:1;
 248                                 /* 1 bits hole */
 249                 } bits;
 250                 __u16           all;
 251         } rxopt;
 252
 253         /* sockopt flags */
 254         __u16                   recverr:1,
 255                                 sndflow:1,
 256                                 repflow:1,
 257                                 pmtudisc:3,
 258                                 padding:1,      /* 1 bit hole */
 259                                 srcprefs:3,     /* 001: prefer temporary address
 260                                                  * 010: prefer public address
 261                                                  * 100: prefer care-of address
 262                                                  */
 263                                 dontfrag:1,
 264                                 autoflowlabel:1;
 265         __u8                    min_hopcount;
 266         __u8                    tclass;
 267         __be32                  rcv_flowinfo;
 268
 269         __u32                   dst_cookie;
 270         __u32                   rx_dst_cookie;
 271
 272         struct ipv6_mc_socklist __rcu *ipv6_mc_list;
 273         struct ipv6_ac_socklist *ipv6_ac_list;
 274         struct ipv6_fl_socklist __rcu *ipv6_fl_list;
 275
 276         struct ipv6_txoptions __rcu     *opt;
 277         struct sk_buff          *pktoptions;
 278         struct sk_buff          *rxpmtu;
 279         struct inet6_cork       cork;
 280 };
 281
 282 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
 283 struct raw6_sock {
 284         /* inet_sock has to be the first member of raw6_sock */
 285         struct inet_sock        inet;
 286         __u32                   checksum;       /* perform checksum */
 287         __u32                   offset;         /* checksum offset  */
 288         struct icmp6_filter     filter;
 289         __u32                   ip6mr_table;
 290         /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */
 291         struct ipv6_pinfo       inet6;
 292 };
 293
 294 struct udp6_sock {
 295         struct udp_sock   udp;
 296         /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */
 297         struct ipv6_pinfo inet6;
 298 };
 299
 300 struct tcp6_sock {
 301         struct tcp_sock   tcp;
 302         /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */
 303         struct ipv6_pinfo inet6;
 304 };
 305
 306 extern int inet6_sk_rebuild_header(struct sock *sk);
 307
 308 struct tcp6_timewait_sock {
 309         struct tcp_timewait_sock   tcp6tw_tcp;
 310 };
 311
 312 #if IS_ENABLED(CONFIG_IPV6)
 313 bool ipv6_mod_enabled(void);
 314
 315 static inline struct ipv6_pinfo *inet6_sk(const struct sock *__sk)
 316 {
 317         return sk_fullsock(__sk) ? inet_sk(__sk)->pinet6 : NULL;
 318 }
 319
 320 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
 321 {
 322         return (struct raw6_sock *)sk;
 323 }
 324
 325 static inline void inet_sk_copy_descendant(struct sock *sk_to,
 326                                            const struct sock *sk_from)
 327 {
 328         int ancestor_size = sizeof(struct inet_sock);
 329
 330         if (sk_from->sk_family == PF_INET6)
 331                 ancestor_size += sizeof(struct ipv6_pinfo);
 332
 333         __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
 334 }
 335
 336 #define __ipv6_only_sock(sk)    (sk->sk_ipv6only)
 337 #define ipv6_only_sock(sk)      (__ipv6_only_sock(sk))
 338 #define ipv6_sk_rxinfo(sk)      ((sk)->sk_family == PF_INET6 && \
 339                                  inet6_sk(sk)->rxopt.bits.rxinfo)
 340
 341 static inline const struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
 342 {
 343         if (sk->sk_family == AF_INET6)
 344                 return &sk->sk_v6_rcv_saddr;
 345         return NULL;
 346 }
 347
 348 static inline int inet_v6_ipv6only(const struct sock *sk)
 349 {
 350         /* ipv6only field is at same position for timewait and other sockets */
 351         return ipv6_only_sock(sk);
 352 }
 353 #else
 354 #define __ipv6_only_sock(sk)    0
 355 #define ipv6_only_sock(sk)      0
 356 #define ipv6_sk_rxinfo(sk)      0
 357
 358 static inline bool ipv6_mod_enabled(void)
 359 {
 360         return false;
 361 }
 362
 363 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
 364 {
 365         return NULL;
 366 }
 367
 368 static inline struct inet6_request_sock *
 369                         inet6_rsk(const struct request_sock *rsk)
 370 {
 371         return NULL;
 372 }
 373
 374 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
 375 {
 376         return NULL;
 377 }
 378
 379 #define inet6_rcv_saddr(__sk)   NULL
 380 #define tcp_twsk_ipv6only(__sk)         0
 381 #define inet_v6_ipv6only(__sk)          0
 382 #endif /* IS_ENABLED(CONFIG_IPV6) */
 383 #endif /* _IPV6_H */