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