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 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
  43         __s32           optimistic_dad;
  44 #endif
  45 #ifdef CONFIG_IPV6_MROUTE
  46         __s32           mc_forwarding;
  47 #endif
  48         __s32           disable_ipv6;
  49         __s32           accept_dad;
  50         __s32           force_tllao;
  51         __s32           ndisc_notify;
  52         __s32           suppress_frag_ndisc;
  53         void            *sysctl;
  54 };
  55
  56 struct ipv6_params {
  57         __s32 disable_ipv6;
  58         __s32 autoconf;
  59 };
  60 extern struct ipv6_params ipv6_defaults;
  61 #include <linux/icmpv6.h>
  62 #include <linux/tcp.h>
  63 #include <linux/udp.h>
  64
  65 #include <net/inet_sock.h>
  66
  67 static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb)
  68 {
  69         return (struct ipv6hdr *)skb_network_header(skb);
  70 }
  71
  72 static inline struct ipv6hdr *inner_ipv6_hdr(const struct sk_buff *skb)
  73 {
  74         return (struct ipv6hdr *)skb_inner_network_header(skb);
  75 }
  76
  77 static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb)
  78 {
  79         return (struct ipv6hdr *)skb_transport_header(skb);
  80 }
  81
  82 /*
  83    This structure contains results of exthdrs parsing
  84    as offsets from skb->nh.
  85  */
  86
  87 struct inet6_skb_parm {
  88         int                     iif;
  89         __be16                  ra;
  90         __u16                   hop;
  91         __u16                   dst0;
  92         __u16                   srcrt;
  93         __u16                   dst1;
  94         __u16                   lastopt;
  95         __u16                   nhoff;
  96         __u16                   flags;
  97 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
  98         __u16                   dsthao;
  99 #endif
 100         __u16                   frag_max_size;
 101
 102 #define IP6SKB_XFRM_TRANSFORMED 1
 103 #define IP6SKB_FORWARDED        2
 104 #define IP6SKB_REROUTED         4
 105 #define IP6SKB_ROUTERALERT      8
 106 #define IP6SKB_FRAGMENTED      16
 107 };
 108
 109 #define IP6CB(skb)      ((struct inet6_skb_parm*)((skb)->cb))
 110 #define IP6CBMTU(skb)   ((struct ip6_mtuinfo *)((skb)->cb))
 111
 112 static inline int inet6_iif(const struct sk_buff *skb)
 113 {
 114         return IP6CB(skb)->iif;
 115 }
 116
 117 struct tcp6_request_sock {
 118         struct tcp_request_sock   tcp6rsk_tcp;
 119 };
 120
 121 struct ipv6_mc_socklist;
 122 struct ipv6_ac_socklist;
 123 struct ipv6_fl_socklist;
 124
 125 /**
 126  * struct ipv6_pinfo - ipv6 private area
 127  *
 128  * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc)
 129  * this _must_ be the last member, so that inet6_sk_generic
 130  * is able to calculate its offset from the base struct sock
 131  * by using the struct proto->slab_obj_size member. -acme
 132  */
 133 struct ipv6_pinfo {
 134         struct in6_addr         saddr;
 135         struct in6_pktinfo      sticky_pktinfo;
 136         const struct in6_addr           *daddr_cache;
 137 #ifdef CONFIG_IPV6_SUBTREES
 138         const struct in6_addr           *saddr_cache;
 139 #endif
 140
 141         __be32                  flow_label;
 142         __u32                   frag_size;
 143
 144         /*
 145          * Packed in 16bits.
 146          * Omit one shift by by putting the signed field at MSB.
 147          */
 148 #if defined(__BIG_ENDIAN_BITFIELD)
 149         __s16                   hop_limit:9;
 150         __u16                   __unused_1:7;
 151 #else
 152         __u16                   __unused_1:7;
 153         __s16                   hop_limit:9;
 154 #endif
 155
 156 #if defined(__BIG_ENDIAN_BITFIELD)
 157         /* Packed in 16bits. */
 158         __s16                   mcast_hops:9;
 159         __u16                   __unused_2:6,
 160                                 mc_loop:1;
 161 #else
 162         __u16                   mc_loop:1,
 163                                 __unused_2:6;
 164         __s16                   mcast_hops:9;
 165 #endif
 166         int                     ucast_oif;
 167         int                     mcast_oif;
 168
 169         /* pktoption flags */
 170         union {
 171                 struct {
 172                         __u16   srcrt:1,
 173                                 osrcrt:1,
 174                                 rxinfo:1,
 175                                 rxoinfo:1,
 176                                 rxhlim:1,
 177                                 rxohlim:1,
 178                                 hopopts:1,
 179                                 ohopopts:1,
 180                                 dstopts:1,
 181                                 odstopts:1,
 182                                 rxflow:1,
 183                                 rxtclass:1,
 184                                 rxpmtu:1,
 185                                 rxorigdstaddr:1;
 186                                 /* 2 bits hole */
 187                 } bits;
 188                 __u16           all;
 189         } rxopt;
 190
 191         /* sockopt flags */
 192         __u16                   recverr:1,
 193                                 sndflow:1,
 194                                 pmtudisc:2,
 195                                 ipv6only:1,
 196                                 srcprefs:3,     /* 001: prefer temporary address
 197                                                  * 010: prefer public address
 198                                                  * 100: prefer care-of address
 199                                                  */
 200                                 dontfrag:1;
 201         __u8                    min_hopcount;
 202         __u8                    tclass;
 203         __u8                    rcv_tclass;
 204
 205         __u32                   dst_cookie;
 206         __u32                   rx_dst_cookie;
 207
 208         struct ipv6_mc_socklist __rcu *ipv6_mc_list;
 209         struct ipv6_ac_socklist *ipv6_ac_list;
 210         struct ipv6_fl_socklist __rcu *ipv6_fl_list;
 211
 212         struct ipv6_txoptions   *opt;
 213         struct sk_buff          *pktoptions;
 214         struct sk_buff          *rxpmtu;
 215         struct {
 216                 struct ipv6_txoptions *opt;
 217                 u8 hop_limit;
 218                 u8 tclass;
 219         } cork;
 220 };
 221
 222 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
 223 struct raw6_sock {
 224         /* inet_sock has to be the first member of raw6_sock */
 225         struct inet_sock        inet;
 226         __u32                   checksum;       /* perform checksum */
 227         __u32                   offset;         /* checksum offset  */
 228         struct icmp6_filter     filter;
 229         __u32                   ip6mr_table;
 230         /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */
 231         struct ipv6_pinfo       inet6;
 232 };
 233
 234 struct udp6_sock {
 235         struct udp_sock   udp;
 236         /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */
 237         struct ipv6_pinfo inet6;
 238 };
 239
 240 struct tcp6_sock {
 241         struct tcp_sock   tcp;
 242         /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */
 243         struct ipv6_pinfo inet6;
 244 };
 245
 246 extern int inet6_sk_rebuild_header(struct sock *sk);
 247
 248 struct tcp6_timewait_sock {
 249         struct tcp_timewait_sock   tcp6tw_tcp;
 250 };
 251
 252 #if IS_ENABLED(CONFIG_IPV6)
 253 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
 254 {
 255         return inet_sk(__sk)->pinet6;
 256 }
 257
 258 static inline struct request_sock *inet6_reqsk_alloc(struct request_sock_ops *ops)
 259 {
 260         struct request_sock *req = reqsk_alloc(ops);
 261
 262         if (req)
 263                 inet_rsk(req)->pktopts = NULL;
 264
 265         return req;
 266 }
 267
 268 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
 269 {
 270         return (struct raw6_sock *)sk;
 271 }
 272
 273 static inline void inet_sk_copy_descendant(struct sock *sk_to,
 274                                            const struct sock *sk_from)
 275 {
 276         int ancestor_size = sizeof(struct inet_sock);
 277
 278         if (sk_from->sk_family == PF_INET6)
 279                 ancestor_size += sizeof(struct ipv6_pinfo);
 280
 281         __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
 282 }
 283
 284 #define __ipv6_only_sock(sk)    (inet6_sk(sk)->ipv6only)
 285 #define ipv6_only_sock(sk)      ((sk)->sk_family == PF_INET6 && __ipv6_only_sock(sk))
 286
 287 static inline const struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
 288 {
 289         if (sk->sk_family == AF_INET6)
 290                 return &sk->sk_v6_rcv_saddr;
 291         return NULL;
 292 }
 293
 294 static inline int inet_v6_ipv6only(const struct sock *sk)
 295 {
 296         return likely(sk->sk_state != TCP_TIME_WAIT) ?
 297                 ipv6_only_sock(sk) : inet_twsk(sk)->tw_ipv6only;
 298 }
 299 #else
 300 #define __ipv6_only_sock(sk)    0
 301 #define ipv6_only_sock(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
 324 #define INET6_MATCH(__sk, __net, __saddr, __daddr, __ports, __dif)      \
 325         (((__sk)->sk_portpair == (__ports))                     &&      \
 326          ((__sk)->sk_family == AF_INET6)                        &&      \
 327          ipv6_addr_equal(&(__sk)->sk_v6_daddr, (__saddr))               &&      \
 328          ipv6_addr_equal(&(__sk)->sk_v6_rcv_saddr, (__daddr))   &&      \
 329          (!(__sk)->sk_bound_dev_if      ||                              \
 330            ((__sk)->sk_bound_dev_if == (__dif)))                &&      \
 331          net_eq(sock_net(__sk), (__net)))
 332
 333 #endif /* _IPV6_H */