1/* SPDX-License-Identifier: GPL-2.0 */ 2#ifndef _IPV6_H 3#define _IPV6_H 4 5#include <uapi/linux/ipv6.h> 6#include <linux/cache.h> 7 8#define ipv6_optlen(p) (((p)->hdrlen+1) << 3) 9#define ipv6_authlen(p) (((p)->hdrlen+2) << 2) 10/* 11 * This structure contains configuration options per IPv6 link. 12 */ 13struct ipv6_devconf { 14 /* RX & TX fastpath fields. */ 15 __cacheline_group_begin(ipv6_devconf_read_txrx); 16 __s32 disable_ipv6; 17 __s32 hop_limit; 18 __s32 mtu6; 19 __s32 forwarding; 20 __s32 disable_policy; 21 __s32 proxy_ndp; 22 __cacheline_group_end(ipv6_devconf_read_txrx); 23 24 __s32 accept_ra; 25 __s32 accept_redirects; 26 __s32 autoconf; 27 __s32 dad_transmits; 28 __s32 rtr_solicits; 29 __s32 rtr_solicit_interval; 30 __s32 rtr_solicit_max_interval; 31 __s32 rtr_solicit_delay; 32 __s32 force_mld_version; 33 __s32 mldv1_unsolicited_report_interval; 34 __s32 mldv2_unsolicited_report_interval; 35 __s32 use_tempaddr; 36 __s32 temp_valid_lft; 37 __s32 temp_prefered_lft; 38 __s32 regen_min_advance; 39 __s32 regen_max_retry; 40 __s32 max_desync_factor; 41 __s32 max_addresses; 42 __s32 accept_ra_defrtr; 43 __u32 ra_defrtr_metric; 44 __s32 accept_ra_min_hop_limit; 45 __s32 accept_ra_min_lft; 46 __s32 accept_ra_pinfo; 47 __s32 ignore_routes_with_linkdown; 48#ifdef CONFIG_IPV6_ROUTER_PREF 49 __s32 accept_ra_rtr_pref; 50 __s32 rtr_probe_interval; 51#ifdef CONFIG_IPV6_ROUTE_INFO 52 __s32 accept_ra_rt_info_min_plen; 53 __s32 accept_ra_rt_info_max_plen; 54#endif 55#endif 56 __s32 accept_source_route; 57 __s32 accept_ra_from_local; 58#ifdef CONFIG_IPV6_OPTIMISTIC_DAD 59 __s32 optimistic_dad; 60 __s32 use_optimistic; 61#endif 62#ifdef CONFIG_IPV6_MROUTE 63 atomic_t mc_forwarding; 64#endif 65 __s32 drop_unicast_in_l2_multicast; 66 __s32 accept_dad; 67 __s32 force_tllao; 68 __s32 ndisc_notify; 69 __s32 suppress_frag_ndisc; 70 __s32 accept_ra_mtu; 71 __s32 drop_unsolicited_na; 72 __s32 accept_untracked_na; 73 struct ipv6_stable_secret { 74 bool initialized; 75 struct in6_addr secret; 76 } stable_secret; 77 __s32 use_oif_addrs_only; 78 __s32 keep_addr_on_down; 79 __s32 seg6_enabled; 80#ifdef CONFIG_IPV6_SEG6_HMAC 81 __s32 seg6_require_hmac; 82#endif 83 __u32 enhanced_dad; 84 __u32 addr_gen_mode; 85 __s32 ndisc_tclass; 86 __s32 rpl_seg_enabled; 87 __u32 ioam6_id; 88 __u32 ioam6_id_wide; 89 __u8 ioam6_enabled; 90 __u8 ndisc_evict_nocarrier; 91 __u8 ra_honor_pio_life; 92 93 struct ctl_table_header *sysctl_header; 94}; 95 96struct ipv6_params { 97 __s32 disable_ipv6; 98 __s32 autoconf; 99}; 100extern struct ipv6_params ipv6_defaults; 101#include <linux/tcp.h> 102#include <linux/udp.h> 103 104#include <net/inet_sock.h> 105 106static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb) 107{ 108 return (struct ipv6hdr *)skb_network_header(skb); 109} 110 111static inline struct ipv6hdr *inner_ipv6_hdr(const struct sk_buff *skb) 112{ 113 return (struct ipv6hdr *)skb_inner_network_header(skb); 114} 115 116static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb) 117{ 118 return (struct ipv6hdr *)skb_transport_header(skb); 119} 120 121static inline unsigned int ipv6_transport_len(const struct sk_buff *skb) 122{ 123 return ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr) - 124 skb_network_header_len(skb); 125} 126 127/* 128 This structure contains results of exthdrs parsing 129 as offsets from skb->nh. 130 */ 131 132struct inet6_skb_parm { 133 int iif; 134 __be16 ra; 135 __u16 dst0; 136 __u16 srcrt; 137 __u16 dst1; 138 __u16 lastopt; 139 __u16 nhoff; 140 __u16 flags; 141#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 142 __u16 dsthao; 143#endif 144 __u16 frag_max_size; 145 __u16 srhoff; 146 147#define IP6SKB_XFRM_TRANSFORMED 1 148#define IP6SKB_FORWARDED 2 149#define IP6SKB_REROUTED 4 150#define IP6SKB_ROUTERALERT 8 151#define IP6SKB_FRAGMENTED 16 152#define IP6SKB_HOPBYHOP 32 153#define IP6SKB_L3SLAVE 64 154#define IP6SKB_JUMBOGRAM 128 155#define IP6SKB_SEG6 256 156#define IP6SKB_FAKEJUMBO 512 157#define IP6SKB_MULTIPATH 1024 158}; 159 160#if defined(CONFIG_NET_L3_MASTER_DEV) 161static inline bool ipv6_l3mdev_skb(__u16 flags) 162{ 163 return flags & IP6SKB_L3SLAVE; 164} 165#else 166static inline bool ipv6_l3mdev_skb(__u16 flags) 167{ 168 return false; 169} 170#endif 171 172#define IP6CB(skb) ((struct inet6_skb_parm*)((skb)->cb)) 173#define IP6CBMTU(skb) ((struct ip6_mtuinfo *)((skb)->cb)) 174 175static inline int inet6_iif(const struct sk_buff *skb) 176{ 177 bool l3_slave = ipv6_l3mdev_skb(IP6CB(skb)->flags); 178 179 return l3_slave ? skb->skb_iif : IP6CB(skb)->iif; 180} 181 182static inline bool inet6_is_jumbogram(const struct sk_buff *skb) 183{ 184 return !!(IP6CB(skb)->flags & IP6SKB_JUMBOGRAM); 185} 186 187/* can not be used in TCP layer after tcp_v6_fill_cb */ 188static inline int inet6_sdif(const struct sk_buff *skb) 189{ 190#if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV) 191 if (skb && ipv6_l3mdev_skb(IP6CB(skb)->flags)) 192 return IP6CB(skb)->iif; 193#endif 194 return 0; 195} 196 197struct tcp6_request_sock { 198 struct tcp_request_sock tcp6rsk_tcp; 199}; 200 201struct ipv6_mc_socklist; 202struct ipv6_ac_socklist; 203struct ipv6_fl_socklist; 204 205struct inet6_cork { 206 struct ipv6_txoptions *opt; 207 u8 hop_limit; 208 u8 tclass; 209}; 210 211/* struct ipv6_pinfo - ipv6 private area */ 212struct ipv6_pinfo { 213 struct in6_addr saddr; 214 struct in6_pktinfo sticky_pktinfo; 215 const struct in6_addr *daddr_cache; 216#ifdef CONFIG_IPV6_SUBTREES 217 const struct in6_addr *saddr_cache; 218#endif 219 220 __be32 flow_label; 221 __u32 frag_size; 222 223 s16 hop_limit; 224 u8 mcast_hops; 225 226 int ucast_oif; 227 int mcast_oif; 228 229 /* pktoption flags */ 230 union { 231 struct { 232 __u16 srcrt:1, 233 osrcrt:1, 234 rxinfo:1, 235 rxoinfo:1, 236 rxhlim:1, 237 rxohlim:1, 238 hopopts:1, 239 ohopopts:1, 240 dstopts:1, 241 odstopts:1, 242 rxflow:1, 243 rxtclass:1, 244 rxpmtu:1, 245 rxorigdstaddr:1, 246 recvfragsize:1; 247 /* 1 bits hole */ 248 } bits; 249 __u16 all; 250 } rxopt; 251 252 /* sockopt flags */ 253 __u8 srcprefs; /* 001: prefer temporary address 254 * 010: prefer public address 255 * 100: prefer care-of address 256 */ 257 __u8 pmtudisc; 258 __u8 min_hopcount; 259 __u8 tclass; 260 __be32 rcv_flowinfo; 261 262 __u32 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/* We currently use available bits from inet_sk(sk)->inet_flags, 275 * this could change in the future. 276 */ 277#define inet6_test_bit(nr, sk) \ 278 test_bit(INET_FLAGS_##nr, &inet_sk(sk)->inet_flags) 279#define inet6_set_bit(nr, sk) \ 280 set_bit(INET_FLAGS_##nr, &inet_sk(sk)->inet_flags) 281#define inet6_clear_bit(nr, sk) \ 282 clear_bit(INET_FLAGS_##nr, &inet_sk(sk)->inet_flags) 283#define inet6_assign_bit(nr, sk, val) \ 284 assign_bit(INET_FLAGS_##nr, &inet_sk(sk)->inet_flags, val) 285 286/* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */ 287struct raw6_sock { 288 /* inet_sock has to be the first member of raw6_sock */ 289 struct inet_sock inet; 290 __u32 checksum; /* perform checksum */ 291 __u32 offset; /* checksum offset */ 292 struct icmp6_filter filter; 293 __u32 ip6mr_table; 294 295 struct ipv6_pinfo inet6; 296}; 297 298struct udp6_sock { 299 struct udp_sock udp; 300 301 struct ipv6_pinfo inet6; 302}; 303 304struct tcp6_sock { 305 struct tcp_sock tcp; 306 307 struct ipv6_pinfo inet6; 308}; 309 310extern int inet6_sk_rebuild_header(struct sock *sk); 311 312struct tcp6_timewait_sock { 313 struct tcp_timewait_sock tcp6tw_tcp; 314}; 315 316#if IS_ENABLED(CONFIG_IPV6) 317bool ipv6_mod_enabled(void); 318 319static inline struct ipv6_pinfo *inet6_sk(const struct sock *__sk) 320{ 321 return sk_fullsock(__sk) ? inet_sk(__sk)->pinet6 : NULL; 322} 323 324#define raw6_sk(ptr) container_of_const(ptr, struct raw6_sock, inet.sk) 325 326#define ipv6_only_sock(sk) (sk->sk_ipv6only) 327#define ipv6_sk_rxinfo(sk) ((sk)->sk_family == PF_INET6 && \ 328 inet6_sk(sk)->rxopt.bits.rxinfo) 329 330static inline const struct in6_addr *inet6_rcv_saddr(const struct sock *sk) 331{ 332 if (sk->sk_family == AF_INET6) 333 return &sk->sk_v6_rcv_saddr; 334 return NULL; 335} 336 337static inline int inet_v6_ipv6only(const struct sock *sk) 338{ 339 /* ipv6only field is at same position for timewait and other sockets */ 340 return ipv6_only_sock(sk); 341} 342#else 343#define ipv6_only_sock(sk) 0 344#define ipv6_sk_rxinfo(sk) 0 345 346static inline bool ipv6_mod_enabled(void) 347{ 348 return false; 349} 350 351static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk) 352{ 353 return NULL; 354} 355 356static inline struct raw6_sock *raw6_sk(const struct sock *sk) 357{ 358 return NULL; 359} 360 361#define inet6_rcv_saddr(__sk) NULL 362#define inet_v6_ipv6only(__sk) 0 363#endif /* IS_ENABLED(CONFIG_IPV6) */ 364#endif /* _IPV6_H */ 365