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