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