1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _IPV6_H
3 #define _IPV6_H
4
5 #include <uapi/linux/ipv6.h>
6
7 #define ipv6_optlen(p) (((p)->hdrlen+1) << 3)
8 #define ipv6_authlen(p) (((p)->hdrlen+2) << 2)
9 /*
10 * This structure contains configuration options per IPv6 link.
11 */
12 struct ipv6_devconf {
13 __s32 forwarding;
14 __s32 hop_limit;
15 __s32 mtu6;
16 __s32 accept_ra;
17 __s32 accept_redirects;
18 __s32 autoconf;
19 __s32 dad_transmits;
20 __s32 rtr_solicits;
21 __s32 rtr_solicit_interval;
22 __s32 rtr_solicit_max_interval;
23 __s32 rtr_solicit_delay;
24 __s32 force_mld_version;
25 __s32 mldv1_unsolicited_report_interval;
26 __s32 mldv2_unsolicited_report_interval;
27 __s32 use_tempaddr;
28 __s32 temp_valid_lft;
29 __s32 temp_prefered_lft;
30 __s32 regen_max_retry;
31 __s32 max_desync_factor;
32 __s32 max_addresses;
33 __s32 accept_ra_defrtr;
34 __u32 ra_defrtr_metric;
35 __s32 accept_ra_min_hop_limit;
36 __s32 accept_ra_min_lft;
37 __s32 accept_ra_pinfo;
38 __s32 ignore_routes_with_linkdown;
39 #ifdef CONFIG_IPV6_ROUTER_PREF
40 __s32 accept_ra_rtr_pref;
41 __s32 rtr_probe_interval;
42 #ifdef CONFIG_IPV6_ROUTE_INFO
43 __s32 accept_ra_rt_info_min_plen;
44 __s32 accept_ra_rt_info_max_plen;
45 #endif
46 #endif
47 __s32 proxy_ndp;
48 __s32 accept_source_route;
49 __s32 accept_ra_from_local;
50 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
51 __s32 optimistic_dad;
52 __s32 use_optimistic;
53 #endif
54 #ifdef CONFIG_IPV6_MROUTE
55 atomic_t mc_forwarding;
56 #endif
57 __s32 disable_ipv6;
58 __s32 drop_unicast_in_l2_multicast;
59 __s32 accept_dad;
60 __s32 force_tllao;
61 __s32 ndisc_notify;
62 __s32 suppress_frag_ndisc;
63 __s32 accept_ra_mtu;
64 __s32 drop_unsolicited_na;
65 __s32 accept_untracked_na;
66 struct ipv6_stable_secret {
67 bool initialized;
68 struct in6_addr secret;
69 } stable_secret;
70 __s32 use_oif_addrs_only;
71 __s32 keep_addr_on_down;
72 __s32 seg6_enabled;
73 #ifdef CONFIG_IPV6_SEG6_HMAC
74 __s32 seg6_require_hmac;
75 #endif
76 __u32 enhanced_dad;
77 __u32 addr_gen_mode;
78 __s32 disable_policy;
79 __s32 ndisc_tclass;
80 __s32 rpl_seg_enabled;
81 __u32 ioam6_id;
82 __u32 ioam6_id_wide;
83 __u8 ioam6_enabled;
84 __u8 ndisc_evict_nocarrier;
85
86 struct ctl_table_header *sysctl_header;
87 };
88
89 struct ipv6_params {
90 __s32 disable_ipv6;
91 __s32 autoconf;
92 };
93 extern struct ipv6_params ipv6_defaults;
94 #include <linux/tcp.h>
95 #include <linux/udp.h>
96
97 #include <net/inet_sock.h>
98
ipv6_hdr(const struct sk_buff * skb)99 static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb)
100 {
101 return (struct ipv6hdr *)skb_network_header(skb);
102 }
103
inner_ipv6_hdr(const struct sk_buff * skb)104 static inline struct ipv6hdr *inner_ipv6_hdr(const struct sk_buff *skb)
105 {
106 return (struct ipv6hdr *)skb_inner_network_header(skb);
107 }
108
ipipv6_hdr(const struct sk_buff * skb)109 static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb)
110 {
111 return (struct ipv6hdr *)skb_transport_header(skb);
112 }
113
ipv6_transport_len(const struct sk_buff * skb)114 static inline unsigned int ipv6_transport_len(const struct sk_buff *skb)
115 {
116 return ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr) -
117 skb_network_header_len(skb);
118 }
119
120 /*
121 This structure contains results of exthdrs parsing
122 as offsets from skb->nh.
123 */
124
125 struct inet6_skb_parm {
126 int iif;
127 __be16 ra;
128 __u16 dst0;
129 __u16 srcrt;
130 __u16 dst1;
131 __u16 lastopt;
132 __u16 nhoff;
133 __u16 flags;
134 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
135 __u16 dsthao;
136 #endif
137 __u16 frag_max_size;
138 __u16 srhoff;
139
140 #define IP6SKB_XFRM_TRANSFORMED 1
141 #define IP6SKB_FORWARDED 2
142 #define IP6SKB_REROUTED 4
143 #define IP6SKB_ROUTERALERT 8
144 #define IP6SKB_FRAGMENTED 16
145 #define IP6SKB_HOPBYHOP 32
146 #define IP6SKB_L3SLAVE 64
147 #define IP6SKB_JUMBOGRAM 128
148 #define IP6SKB_SEG6 256
149 #define IP6SKB_FAKEJUMBO 512
150 #define IP6SKB_MULTIPATH 1024
151 };
152
153 #if defined(CONFIG_NET_L3_MASTER_DEV)
ipv6_l3mdev_skb(__u16 flags)154 static inline bool ipv6_l3mdev_skb(__u16 flags)
155 {
156 return flags & IP6SKB_L3SLAVE;
157 }
158 #else
ipv6_l3mdev_skb(__u16 flags)159 static inline bool ipv6_l3mdev_skb(__u16 flags)
160 {
161 return false;
162 }
163 #endif
164
165 #define IP6CB(skb) ((struct inet6_skb_parm*)((skb)->cb))
166 #define IP6CBMTU(skb) ((struct ip6_mtuinfo *)((skb)->cb))
167
inet6_iif(const struct sk_buff * skb)168 static inline int inet6_iif(const struct sk_buff *skb)
169 {
170 bool l3_slave = ipv6_l3mdev_skb(IP6CB(skb)->flags);
171
172 return l3_slave ? skb->skb_iif : IP6CB(skb)->iif;
173 }
174
inet6_is_jumbogram(const struct sk_buff * skb)175 static inline bool inet6_is_jumbogram(const struct sk_buff *skb)
176 {
177 return !!(IP6CB(skb)->flags & IP6SKB_JUMBOGRAM);
178 }
179
180 /* can not be used in TCP layer after tcp_v6_fill_cb */
inet6_sdif(const struct sk_buff * skb)181 static inline int inet6_sdif(const struct sk_buff *skb)
182 {
183 #if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV)
184 if (skb && ipv6_l3mdev_skb(IP6CB(skb)->flags))
185 return IP6CB(skb)->iif;
186 #endif
187 return 0;
188 }
189
190 struct tcp6_request_sock {
191 struct tcp_request_sock tcp6rsk_tcp;
192 };
193
194 struct ipv6_mc_socklist;
195 struct ipv6_ac_socklist;
196 struct ipv6_fl_socklist;
197
198 struct inet6_cork {
199 struct ipv6_txoptions *opt;
200 u8 hop_limit;
201 u8 tclass;
202 u8 dontfrag:1;
203 };
204
205 /* struct ipv6_pinfo - ipv6 private area */
206 struct ipv6_pinfo {
207 struct in6_addr saddr;
208 struct in6_pktinfo sticky_pktinfo;
209 const struct in6_addr *daddr_cache;
210 #ifdef CONFIG_IPV6_SUBTREES
211 const struct in6_addr *saddr_cache;
212 #endif
213
214 __be32 flow_label;
215 __u32 frag_size;
216
217 /*
218 * Packed in 16bits.
219 * Omit one shift by putting the signed field at MSB.
220 */
221 #if defined(__BIG_ENDIAN_BITFIELD)
222 __s16 hop_limit:9;
223 __u16 __unused_1:7;
224 #else
225 __u16 __unused_1:7;
226 __s16 hop_limit:9;
227 #endif
228
229 #if defined(__BIG_ENDIAN_BITFIELD)
230 /* Packed in 16bits. */
231 __s16 mcast_hops:9;
232 __u16 __unused_2:6,
233 mc_loop:1;
234 #else
235 __u16 mc_loop:1,
236 __unused_2:6;
237 __s16 mcast_hops:9;
238 #endif
239 int ucast_oif;
240 int mcast_oif;
241
242 /* pktoption flags */
243 union {
244 struct {
245 __u16 srcrt:1,
246 osrcrt:1,
247 rxinfo:1,
248 rxoinfo:1,
249 rxhlim:1,
250 rxohlim:1,
251 hopopts:1,
252 ohopopts:1,
253 dstopts:1,
254 odstopts:1,
255 rxflow:1,
256 rxtclass:1,
257 rxpmtu:1,
258 rxorigdstaddr:1,
259 recvfragsize:1;
260 /* 1 bits hole */
261 } bits;
262 __u16 all;
263 } rxopt;
264
265 /* sockopt flags */
266 __u16 recverr:1,
267 sndflow:1,
268 repflow:1,
269 pmtudisc:3,
270 padding:1, /* 1 bit hole */
271 srcprefs:3, /* 001: prefer temporary address
272 * 010: prefer public address
273 * 100: prefer care-of address
274 */
275 dontfrag:1,
276 autoflowlabel:1,
277 autoflowlabel_set:1,
278 mc_all:1,
279 recverr_rfc4884:1,
280 rtalert_isolate:1;
281 __u8 min_hopcount;
282 __u8 tclass;
283 __be32 rcv_flowinfo;
284
285 __u32 dst_cookie;
286
287 struct ipv6_mc_socklist __rcu *ipv6_mc_list;
288 struct ipv6_ac_socklist *ipv6_ac_list;
289 struct ipv6_fl_socklist __rcu *ipv6_fl_list;
290
291 struct ipv6_txoptions __rcu *opt;
292 struct sk_buff *pktoptions;
293 struct sk_buff *rxpmtu;
294 struct inet6_cork cork;
295 };
296
297 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
298 struct raw6_sock {
299 /* inet_sock has to be the first member of raw6_sock */
300 struct inet_sock inet;
301 __u32 checksum; /* perform checksum */
302 __u32 offset; /* checksum offset */
303 struct icmp6_filter filter;
304 __u32 ip6mr_table;
305
306 struct ipv6_pinfo inet6;
307 };
308
309 struct udp6_sock {
310 struct udp_sock udp;
311
312 struct ipv6_pinfo inet6;
313 };
314
315 struct tcp6_sock {
316 struct tcp_sock tcp;
317
318 struct ipv6_pinfo inet6;
319 };
320
321 extern int inet6_sk_rebuild_header(struct sock *sk);
322
323 struct tcp6_timewait_sock {
324 struct tcp_timewait_sock tcp6tw_tcp;
325 };
326
327 #if IS_ENABLED(CONFIG_IPV6)
328 bool ipv6_mod_enabled(void);
329
inet6_sk(const struct sock * __sk)330 static inline struct ipv6_pinfo *inet6_sk(const struct sock *__sk)
331 {
332 return sk_fullsock(__sk) ? inet_sk(__sk)->pinet6 : NULL;
333 }
334
335 #define raw6_sk(ptr) container_of_const(ptr, struct raw6_sock, inet.sk)
336
337 #define ipv6_only_sock(sk) (sk->sk_ipv6only)
338 #define ipv6_sk_rxinfo(sk) ((sk)->sk_family == PF_INET6 && \
339 inet6_sk(sk)->rxopt.bits.rxinfo)
340
inet6_rcv_saddr(const struct sock * sk)341 static inline const struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
342 {
343 if (sk->sk_family == AF_INET6)
344 return &sk->sk_v6_rcv_saddr;
345 return NULL;
346 }
347
inet_v6_ipv6only(const struct sock * sk)348 static inline int inet_v6_ipv6only(const struct sock *sk)
349 {
350 /* ipv6only field is at same position for timewait and other sockets */
351 return ipv6_only_sock(sk);
352 }
353 #else
354 #define ipv6_only_sock(sk) 0
355 #define ipv6_sk_rxinfo(sk) 0
356
ipv6_mod_enabled(void)357 static inline bool ipv6_mod_enabled(void)
358 {
359 return false;
360 }
361
inet6_sk(const struct sock * __sk)362 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
363 {
364 return NULL;
365 }
366
raw6_sk(const struct sock * sk)367 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
368 {
369 return NULL;
370 }
371
372 #define inet6_rcv_saddr(__sk) NULL
373 #define inet_v6_ipv6only(__sk) 0
374 #endif /* IS_ENABLED(CONFIG_IPV6) */
375 #endif /* _IPV6_H */
376