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_delay;
  22         __s32           force_mld_version;
  23         __s32           mldv1_unsolicited_report_interval;
  24         __s32           mldv2_unsolicited_report_interval;
  25         __s32           use_tempaddr;
  26         __s32           temp_valid_lft;
  27         __s32           temp_prefered_lft;
  28         __s32           regen_max_retry;
  29         __s32           max_desync_factor;
  30         __s32           max_addresses;
  31         __s32           accept_ra_defrtr;
  32         __s32           accept_ra_min_hop_limit;
  33         __s32           accept_ra_pinfo;
  34         __s32           ignore_routes_with_linkdown;
  35 #ifdef CONFIG_IPV6_ROUTER_PREF
  36         __s32           accept_ra_rtr_pref;
  37         __s32           rtr_probe_interval;
  38 #ifdef CONFIG_IPV6_ROUTE_INFO
  39         __s32           accept_ra_rt_info_max_plen;
  40 #endif
  41 #endif
  42         __s32           proxy_ndp;
  43         __s32           accept_source_route;
  44         __s32           accept_ra_from_local;
  45 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
  46         __s32           optimistic_dad;
  47         __s32           use_optimistic;
  48 #endif
  49 #ifdef CONFIG_IPV6_MROUTE
  50         __s32           mc_forwarding;
  51 #endif
  52         __s32           disable_ipv6;
  53         __s32           drop_unicast_in_l2_multicast;
  54         __s32           accept_dad;
  55         __s32           force_tllao;
  56         __s32           ndisc_notify;
  57         __s32           suppress_frag_ndisc;
  58         __s32           accept_ra_mtu;
  59         __s32           drop_unsolicited_na;
  60         struct ipv6_stable_secret {
  61                 bool initialized;
  62                 struct in6_addr secret;
  63         } stable_secret;
  64         __s32           use_oif_addrs_only;
  65         __s32           keep_addr_on_down;
  66
  67         struct ctl_table_header *sysctl_header;
  68 };
  69
  70 struct ipv6_params {
  71         __s32 disable_ipv6;
  72         __s32 autoconf;
  73 };
  74 extern struct ipv6_params ipv6_defaults;
  75 #include <linux/icmpv6.h>
  76 #include <linux/tcp.h>
  77 #include <linux/udp.h>
  78
  79 #include <net/inet_sock.h>
  80
  81 static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb)
  82 {
  83         return (struct ipv6hdr *)skb_network_header(skb);
  84 }
  85
  86 static inline struct ipv6hdr *inner_ipv6_hdr(const struct sk_buff *skb)
  87 {
  88         return (struct ipv6hdr *)skb_inner_network_header(skb);
  89 }
  90
  91 static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb)
  92 {
  93         return (struct ipv6hdr *)skb_transport_header(skb);
  94 }
  95
  96 /*
  97    This structure contains results of exthdrs parsing
  98    as offsets from skb->nh.
  99  */
 100
 101 struct inet6_skb_parm {
 102         int                     iif;
 103         __be16                  ra;
 104         __u16                   dst0;
 105         __u16                   srcrt;
 106         __u16                   dst1;
 107         __u16                   lastopt;
 108         __u16                   nhoff;
 109         __u16                   flags;
 110 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
 111         __u16                   dsthao;
 112 #endif
 113         __u16                   frag_max_size;
 114
 115 #define IP6SKB_XFRM_TRANSFORMED 1
 116 #define IP6SKB_FORWARDED        2
 117 #define IP6SKB_REROUTED         4
 118 #define IP6SKB_ROUTERALERT      8
 119 #define IP6SKB_FRAGMENTED      16
 120 #define IP6SKB_HOPBYHOP        32
 121 #define IP6SKB_L3SLAVE         64
 122 };
 123
 124 #if defined(CONFIG_NET_L3_MASTER_DEV)
 125 static inline bool skb_l3mdev_slave(__u16 flags)
 126 {
 127         return flags & IP6SKB_L3SLAVE;
 128 }
 129 #else
 130 static inline bool skb_l3mdev_slave(__u16 flags)
 131 {
 132         return false;
 133 }
 134 #endif
 135
 136 #define IP6CB(skb)      ((struct inet6_skb_parm*)((skb)->cb))
 137 #define IP6CBMTU(skb)   ((struct ip6_mtuinfo *)((skb)->cb))
 138
 139 static inline int inet6_iif(const struct sk_buff *skb)
 140 {
 141         bool l3_slave = skb_l3mdev_slave(IP6CB(skb)->flags);
 142
 143         return l3_slave ? skb->skb_iif : IP6CB(skb)->iif;
 144 }
 145
 146 struct tcp6_request_sock {
 147         struct tcp_request_sock   tcp6rsk_tcp;
 148 };
 149
 150 struct ipv6_mc_socklist;
 151 struct ipv6_ac_socklist;
 152 struct ipv6_fl_socklist;
 153
 154 struct inet6_cork {
 155         struct ipv6_txoptions *opt;
 156         u8 hop_limit;
 157         u8 tclass;
 158 };
 159
 160 /**
 161  * struct ipv6_pinfo - ipv6 private area
 162  *
 163  * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc)
 164  * this _must_ be the last member, so that inet6_sk_generic
 165  * is able to calculate its offset from the base struct sock
 166  * by using the struct proto->slab_obj_size member. -acme
 167  */
 168 struct ipv6_pinfo {
 169         struct in6_addr         saddr;
 170         struct in6_pktinfo      sticky_pktinfo;
 171         const struct in6_addr           *daddr_cache;
 172 #ifdef CONFIG_IPV6_SUBTREES
 173         const struct in6_addr           *saddr_cache;
 174 #endif
 175
 176         __be32                  flow_label;
 177         __u32                   frag_size;
 178
 179         /*
 180          * Packed in 16bits.
 181          * Omit one shift by by putting the signed field at MSB.
 182          */
 183 #if defined(__BIG_ENDIAN_BITFIELD)
 184         __s16                   hop_limit:9;
 185         __u16                   __unused_1:7;
 186 #else
 187         __u16                   __unused_1:7;
 188         __s16                   hop_limit:9;
 189 #endif
 190
 191 #if defined(__BIG_ENDIAN_BITFIELD)
 192         /* Packed in 16bits. */
 193         __s16                   mcast_hops:9;
 194         __u16                   __unused_2:6,
 195                                 mc_loop:1;
 196 #else
 197         __u16                   mc_loop:1,
 198                                 __unused_2:6;
 199         __s16                   mcast_hops:9;
 200 #endif
 201         int                     ucast_oif;
 202         int                     mcast_oif;
 203
 204         /* pktoption flags */
 205         union {
 206                 struct {
 207                         __u16   srcrt:1,
 208                                 osrcrt:1,
 209                                 rxinfo:1,
 210                                 rxoinfo:1,
 211                                 rxhlim:1,
 212                                 rxohlim:1,
 213                                 hopopts:1,
 214                                 ohopopts:1,
 215                                 dstopts:1,
 216                                 odstopts:1,
 217                                 rxflow:1,
 218                                 rxtclass:1,
 219                                 rxpmtu:1,
 220                                 rxorigdstaddr:1;
 221                                 /* 2 bits hole */
 222                 } bits;
 223                 __u16           all;
 224         } rxopt;
 225
 226         /* sockopt flags */
 227         __u16                   recverr:1,
 228                                 sndflow:1,
 229                                 repflow:1,
 230                                 pmtudisc:3,
 231                                 padding:1,      /* 1 bit hole */
 232                                 srcprefs:3,     /* 001: prefer temporary address
 233                                                  * 010: prefer public address
 234                                                  * 100: prefer care-of address
 235                                                  */
 236                                 dontfrag:1,
 237                                 autoflowlabel:1;
 238         __u8                    min_hopcount;
 239         __u8                    tclass;
 240         __be32                  rcv_flowinfo;
 241
 242         __u32                   dst_cookie;
 243         __u32                   rx_dst_cookie;
 244
 245         struct ipv6_mc_socklist __rcu *ipv6_mc_list;
 246         struct ipv6_ac_socklist *ipv6_ac_list;
 247         struct ipv6_fl_socklist __rcu *ipv6_fl_list;
 248
 249         struct ipv6_txoptions __rcu     *opt;
 250         struct sk_buff          *pktoptions;
 251         struct sk_buff          *rxpmtu;
 252         struct inet6_cork       cork;
 253 };
 254
 255 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
 256 struct raw6_sock {
 257         /* inet_sock has to be the first member of raw6_sock */
 258         struct inet_sock        inet;
 259         __u32                   checksum;       /* perform checksum */
 260         __u32                   offset;         /* checksum offset  */
 261         struct icmp6_filter     filter;
 262         __u32                   ip6mr_table;
 263         /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */
 264         struct ipv6_pinfo       inet6;
 265 };
 266
 267 struct udp6_sock {
 268         struct udp_sock   udp;
 269         /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */
 270         struct ipv6_pinfo inet6;
 271 };
 272
 273 struct tcp6_sock {
 274         struct tcp_sock   tcp;
 275         /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */
 276         struct ipv6_pinfo inet6;
 277 };
 278
 279 extern int inet6_sk_rebuild_header(struct sock *sk);
 280
 281 struct tcp6_timewait_sock {
 282         struct tcp_timewait_sock   tcp6tw_tcp;
 283 };
 284
 285 #if IS_ENABLED(CONFIG_IPV6)
 286 bool ipv6_mod_enabled(void);
 287
 288 static inline struct ipv6_pinfo *inet6_sk(const struct sock *__sk)
 289 {
 290         return sk_fullsock(__sk) ? inet_sk(__sk)->pinet6 : NULL;
 291 }
 292
 293 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
 294 {
 295         return (struct raw6_sock *)sk;
 296 }
 297
 298 static inline void inet_sk_copy_descendant(struct sock *sk_to,
 299                                            const struct sock *sk_from)
 300 {
 301         int ancestor_size = sizeof(struct inet_sock);
 302
 303         if (sk_from->sk_family == PF_INET6)
 304                 ancestor_size += sizeof(struct ipv6_pinfo);
 305
 306         __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
 307 }
 308
 309 #define __ipv6_only_sock(sk)    (sk->sk_ipv6only)
 310 #define ipv6_only_sock(sk)      (__ipv6_only_sock(sk))
 311 #define ipv6_sk_rxinfo(sk)      ((sk)->sk_family == PF_INET6 && \
 312                                  inet6_sk(sk)->rxopt.bits.rxinfo)
 313
 314 static inline const struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
 315 {
 316         if (sk->sk_family == AF_INET6)
 317                 return &sk->sk_v6_rcv_saddr;
 318         return NULL;
 319 }
 320
 321 static inline int inet_v6_ipv6only(const struct sock *sk)
 322 {
 323         /* ipv6only field is at same position for timewait and other sockets */
 324         return ipv6_only_sock(sk);
 325 }
 326 #else
 327 #define __ipv6_only_sock(sk)    0
 328 #define ipv6_only_sock(sk)      0
 329 #define ipv6_sk_rxinfo(sk)      0
 330
 331 static inline bool ipv6_mod_enabled(void)
 332 {
 333         return false;
 334 }
 335
 336 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
 337 {
 338         return NULL;
 339 }
 340
 341 static inline struct inet6_request_sock *
 342                         inet6_rsk(const struct request_sock *rsk)
 343 {
 344         return NULL;
 345 }
 346
 347 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
 348 {
 349         return NULL;
 350 }
 351
 352 #define inet6_rcv_saddr(__sk)   NULL
 353 #define tcp_twsk_ipv6only(__sk)         0
 354 #define inet_v6_ipv6only(__sk)          0
 355 #endif /* IS_ENABLED(CONFIG_IPV6) */
 356 #endif /* _IPV6_H */