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