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 skb_l3mdev_slave(__u16 flags)
 127 {
 128         return flags & IP6SKB_L3SLAVE;
 129 }
 130 #else
 131 static inline bool skb_l3mdev_slave(__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 = skb_l3mdev_slave(IP6CB(skb)->flags);
 143
 144         return l3_slave ? skb->skb_iif : IP6CB(skb)->iif;
 145 }
 146
 147 struct tcp6_request_sock {
 148         struct tcp_request_sock   tcp6rsk_tcp;
 149 };
 150
 151 struct ipv6_mc_socklist;
 152 struct ipv6_ac_socklist;
 153 struct ipv6_fl_socklist;
 154
 155 struct inet6_cork {
 156         struct ipv6_txoptions *opt;
 157         u8 hop_limit;
 158         u8 tclass;
 159 };
 160
 161 /**
 162  * struct ipv6_pinfo - ipv6 private area
 163  *
 164  * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc)
 165  * this _must_ be the last member, so that inet6_sk_generic
 166  * is able to calculate its offset from the base struct sock
 167  * by using the struct proto->slab_obj_size member. -acme
 168  */
 169 struct ipv6_pinfo {
 170         struct in6_addr         saddr;
 171         struct in6_pktinfo      sticky_pktinfo;
 172         const struct in6_addr           *daddr_cache;
 173 #ifdef CONFIG_IPV6_SUBTREES
 174         const struct in6_addr           *saddr_cache;
 175 #endif
 176
 177         __be32                  flow_label;
 178         __u32                   frag_size;
 179
 180         /*
 181          * Packed in 16bits.
 182          * Omit one shift by by putting the signed field at MSB.
 183          */
 184 #if defined(__BIG_ENDIAN_BITFIELD)
 185         __s16                   hop_limit:9;
 186         __u16                   __unused_1:7;
 187 #else
 188         __u16                   __unused_1:7;
 189         __s16                   hop_limit:9;
 190 #endif
 191
 192 #if defined(__BIG_ENDIAN_BITFIELD)
 193         /* Packed in 16bits. */
 194         __s16                   mcast_hops:9;
 195         __u16                   __unused_2:6,
 196                                 mc_loop:1;
 197 #else
 198         __u16                   mc_loop:1,
 199                                 __unused_2:6;
 200         __s16                   mcast_hops:9;
 201 #endif
 202         int                     ucast_oif;
 203         int                     mcast_oif;
 204
 205         /* pktoption flags */
 206         union {
 207                 struct {
 208                         __u16   srcrt:1,
 209                                 osrcrt:1,
 210                                 rxinfo:1,
 211                                 rxoinfo:1,
 212                                 rxhlim:1,
 213                                 rxohlim:1,
 214                                 hopopts:1,
 215                                 ohopopts:1,
 216                                 dstopts:1,
 217                                 odstopts:1,
 218                                 rxflow:1,
 219                                 rxtclass:1,
 220                                 rxpmtu:1,
 221                                 rxorigdstaddr:1;
 222                                 /* 2 bits hole */
 223                 } bits;
 224                 __u16           all;
 225         } rxopt;
 226
 227         /* sockopt flags */
 228         __u16                   recverr:1,
 229                                 sndflow:1,
 230                                 repflow:1,
 231                                 pmtudisc:3,
 232                                 padding:1,      /* 1 bit hole */
 233                                 srcprefs:3,     /* 001: prefer temporary address
 234                                                  * 010: prefer public address
 235                                                  * 100: prefer care-of address
 236                                                  */
 237                                 dontfrag:1,
 238                                 autoflowlabel:1;
 239         __u8                    min_hopcount;
 240         __u8                    tclass;
 241         __be32                  rcv_flowinfo;
 242
 243         __u32                   dst_cookie;
 244         __u32                   rx_dst_cookie;
 245
 246         struct ipv6_mc_socklist __rcu *ipv6_mc_list;
 247         struct ipv6_ac_socklist *ipv6_ac_list;
 248         struct ipv6_fl_socklist __rcu *ipv6_fl_list;
 249
 250         struct ipv6_txoptions __rcu     *opt;
 251         struct sk_buff          *pktoptions;
 252         struct sk_buff          *rxpmtu;
 253         struct inet6_cork       cork;
 254 };
 255
 256 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
 257 struct raw6_sock {
 258         /* inet_sock has to be the first member of raw6_sock */
 259         struct inet_sock        inet;
 260         __u32                   checksum;       /* perform checksum */
 261         __u32                   offset;         /* checksum offset  */
 262         struct icmp6_filter     filter;
 263         __u32                   ip6mr_table;
 264         /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */
 265         struct ipv6_pinfo       inet6;
 266 };
 267
 268 struct udp6_sock {
 269         struct udp_sock   udp;
 270         /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */
 271         struct ipv6_pinfo inet6;
 272 };
 273
 274 struct tcp6_sock {
 275         struct tcp_sock   tcp;
 276         /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */
 277         struct ipv6_pinfo inet6;
 278 };
 279
 280 extern int inet6_sk_rebuild_header(struct sock *sk);
 281
 282 struct tcp6_timewait_sock {
 283         struct tcp_timewait_sock   tcp6tw_tcp;
 284 };
 285
 286 #if IS_ENABLED(CONFIG_IPV6)
 287 bool ipv6_mod_enabled(void);
 288
 289 static inline struct ipv6_pinfo *inet6_sk(const struct sock *__sk)
 290 {
 291         return sk_fullsock(__sk) ? inet_sk(__sk)->pinet6 : NULL;
 292 }
 293
 294 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
 295 {
 296         return (struct raw6_sock *)sk;
 297 }
 298
 299 static inline void inet_sk_copy_descendant(struct sock *sk_to,
 300                                            const struct sock *sk_from)
 301 {
 302         int ancestor_size = sizeof(struct inet_sock);
 303
 304         if (sk_from->sk_family == PF_INET6)
 305                 ancestor_size += sizeof(struct ipv6_pinfo);
 306
 307         __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
 308 }
 309
 310 #define __ipv6_only_sock(sk)    (sk->sk_ipv6only)
 311 #define ipv6_only_sock(sk)      (__ipv6_only_sock(sk))
 312 #define ipv6_sk_rxinfo(sk)      ((sk)->sk_family == PF_INET6 && \
 313                                  inet6_sk(sk)->rxopt.bits.rxinfo)
 314
 315 static inline const struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
 316 {
 317         if (sk->sk_family == AF_INET6)
 318                 return &sk->sk_v6_rcv_saddr;
 319         return NULL;
 320 }
 321
 322 static inline int inet_v6_ipv6only(const struct sock *sk)
 323 {
 324         /* ipv6only field is at same position for timewait and other sockets */
 325         return ipv6_only_sock(sk);
 326 }
 327 #else
 328 #define __ipv6_only_sock(sk)    0
 329 #define ipv6_only_sock(sk)      0
 330 #define ipv6_sk_rxinfo(sk)      0
 331
 332 static inline bool ipv6_mod_enabled(void)
 333 {
 334         return false;
 335 }
 336
 337 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
 338 {
 339         return NULL;
 340 }
 341
 342 static inline struct inet6_request_sock *
 343                         inet6_rsk(const struct request_sock *rsk)
 344 {
 345         return NULL;
 346 }
 347
 348 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
 349 {
 350         return NULL;
 351 }
 352
 353 #define inet6_rcv_saddr(__sk)   NULL
 354 #define tcp_twsk_ipv6only(__sk)         0
 355 #define inet_v6_ipv6only(__sk)          0
 356 #endif /* IS_ENABLED(CONFIG_IPV6) */
 357 #endif /* _IPV6_H */