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 __u8 ra_honor_pio_life;
86
87 struct ctl_table_header *sysctl_header;
88 };
89
90 struct ipv6_params {
91 __s32 disable_ipv6;
92 __s32 autoconf;
93 };
94 extern struct ipv6_params ipv6_defaults;
95 #include <linux/tcp.h>
96 #include <linux/udp.h>
97
98 #include <net/inet_sock.h>
99
ipv6_hdr(const struct sk_buff * skb)100 static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb)
101 {
102 return (struct ipv6hdr *)skb_network_header(skb);
103 }
104
inner_ipv6_hdr(const struct sk_buff * skb)105 static inline struct ipv6hdr *inner_ipv6_hdr(const struct sk_buff *skb)
106 {
107 return (struct ipv6hdr *)skb_inner_network_header(skb);
108 }
109
ipipv6_hdr(const struct sk_buff * skb)110 static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb)
111 {
112 return (struct ipv6hdr *)skb_transport_header(skb);
113 }
114
ipv6_transport_len(const struct sk_buff * skb)115 static inline unsigned int ipv6_transport_len(const struct sk_buff *skb)
116 {
117 return ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr) -
118 skb_network_header_len(skb);
119 }
120
121 /*
122 This structure contains results of exthdrs parsing
123 as offsets from skb->nh.
124 */
125
126 struct inet6_skb_parm {
127 int iif;
128 __be16 ra;
129 __u16 dst0;
130 __u16 srcrt;
131 __u16 dst1;
132 __u16 lastopt;
133 __u16 nhoff;
134 __u16 flags;
135 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
136 __u16 dsthao;
137 #endif
138 __u16 frag_max_size;
139 __u16 srhoff;
140
141 #define IP6SKB_XFRM_TRANSFORMED 1
142 #define IP6SKB_FORWARDED 2
143 #define IP6SKB_REROUTED 4
144 #define IP6SKB_ROUTERALERT 8
145 #define IP6SKB_FRAGMENTED 16
146 #define IP6SKB_HOPBYHOP 32
147 #define IP6SKB_L3SLAVE 64
148 #define IP6SKB_JUMBOGRAM 128
149 #define IP6SKB_SEG6 256
150 #define IP6SKB_FAKEJUMBO 512
151 #define IP6SKB_MULTIPATH 1024
152 };
153
154 #if defined(CONFIG_NET_L3_MASTER_DEV)
ipv6_l3mdev_skb(__u16 flags)155 static inline bool ipv6_l3mdev_skb(__u16 flags)
156 {
157 return flags & IP6SKB_L3SLAVE;
158 }
159 #else
ipv6_l3mdev_skb(__u16 flags)160 static inline bool ipv6_l3mdev_skb(__u16 flags)
161 {
162 return false;
163 }
164 #endif
165
166 #define IP6CB(skb) ((struct inet6_skb_parm*)((skb)->cb))
167 #define IP6CBMTU(skb) ((struct ip6_mtuinfo *)((skb)->cb))
168
inet6_iif(const struct sk_buff * skb)169 static inline int inet6_iif(const struct sk_buff *skb)
170 {
171 bool l3_slave = ipv6_l3mdev_skb(IP6CB(skb)->flags);
172
173 return l3_slave ? skb->skb_iif : IP6CB(skb)->iif;
174 }
175
inet6_is_jumbogram(const struct sk_buff * skb)176 static inline bool inet6_is_jumbogram(const struct sk_buff *skb)
177 {
178 return !!(IP6CB(skb)->flags & IP6SKB_JUMBOGRAM);
179 }
180
181 /* can not be used in TCP layer after tcp_v6_fill_cb */
inet6_sdif(const struct sk_buff * skb)182 static inline int inet6_sdif(const struct sk_buff *skb)
183 {
184 #if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV)
185 if (skb && ipv6_l3mdev_skb(IP6CB(skb)->flags))
186 return IP6CB(skb)->iif;
187 #endif
188 return 0;
189 }
190
191 struct tcp6_request_sock {
192 struct tcp_request_sock tcp6rsk_tcp;
193 };
194
195 struct ipv6_mc_socklist;
196 struct ipv6_ac_socklist;
197 struct ipv6_fl_socklist;
198
199 struct inet6_cork {
200 struct ipv6_txoptions *opt;
201 u8 hop_limit;
202 u8 tclass;
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 s16 hop_limit;
218 u8 mcast_hops;
219
220 int ucast_oif;
221 int mcast_oif;
222
223 /* pktoption flags */
224 union {
225 struct {
226 __u16 srcrt:1,
227 osrcrt:1,
228 rxinfo:1,
229 rxoinfo:1,
230 rxhlim:1,
231 rxohlim:1,
232 hopopts:1,
233 ohopopts:1,
234 dstopts:1,
235 odstopts:1,
236 rxflow:1,
237 rxtclass:1,
238 rxpmtu:1,
239 rxorigdstaddr:1,
240 recvfragsize:1;
241 /* 1 bits hole */
242 } bits;
243 __u16 all;
244 } rxopt;
245
246 /* sockopt flags */
247 __u8 srcprefs; /* 001: prefer temporary address
248 * 010: prefer public address
249 * 100: prefer care-of address
250 */
251 __u8 pmtudisc;
252 __u8 min_hopcount;
253 __u8 tclass;
254 __be32 rcv_flowinfo;
255
256 __u32 dst_cookie;
257
258 struct ipv6_mc_socklist __rcu *ipv6_mc_list;
259 struct ipv6_ac_socklist *ipv6_ac_list;
260 struct ipv6_fl_socklist __rcu *ipv6_fl_list;
261
262 struct ipv6_txoptions __rcu *opt;
263 struct sk_buff *pktoptions;
264 struct sk_buff *rxpmtu;
265 struct inet6_cork cork;
266 };
267
268 /* We currently use available bits from inet_sk(sk)->inet_flags,
269 * this could change in the future.
270 */
271 #define inet6_test_bit(nr, sk) \
272 test_bit(INET_FLAGS_##nr, &inet_sk(sk)->inet_flags)
273 #define inet6_set_bit(nr, sk) \
274 set_bit(INET_FLAGS_##nr, &inet_sk(sk)->inet_flags)
275 #define inet6_clear_bit(nr, sk) \
276 clear_bit(INET_FLAGS_##nr, &inet_sk(sk)->inet_flags)
277 #define inet6_assign_bit(nr, sk, val) \
278 assign_bit(INET_FLAGS_##nr, &inet_sk(sk)->inet_flags, val)
279
280 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
281 struct raw6_sock {
282 /* inet_sock has to be the first member of raw6_sock */
283 struct inet_sock inet;
284 __u32 checksum; /* perform checksum */
285 __u32 offset; /* checksum offset */
286 struct icmp6_filter filter;
287 __u32 ip6mr_table;
288
289 struct ipv6_pinfo inet6;
290 };
291
292 struct udp6_sock {
293 struct udp_sock udp;
294
295 struct ipv6_pinfo inet6;
296 };
297
298 struct tcp6_sock {
299 struct tcp_sock tcp;
300
301 struct ipv6_pinfo inet6;
302 };
303
304 extern int inet6_sk_rebuild_header(struct sock *sk);
305
306 struct tcp6_timewait_sock {
307 struct tcp_timewait_sock tcp6tw_tcp;
308 };
309
310 #if IS_ENABLED(CONFIG_IPV6)
311 bool ipv6_mod_enabled(void);
312
inet6_sk(const struct sock * __sk)313 static inline struct ipv6_pinfo *inet6_sk(const struct sock *__sk)
314 {
315 return sk_fullsock(__sk) ? inet_sk(__sk)->pinet6 : NULL;
316 }
317
318 #define raw6_sk(ptr) container_of_const(ptr, struct raw6_sock, inet.sk)
319
320 #define ipv6_only_sock(sk) (sk->sk_ipv6only)
321 #define ipv6_sk_rxinfo(sk) ((sk)->sk_family == PF_INET6 && \
322 inet6_sk(sk)->rxopt.bits.rxinfo)
323
inet6_rcv_saddr(const struct sock * sk)324 static inline const struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
325 {
326 if (sk->sk_family == AF_INET6)
327 return &sk->sk_v6_rcv_saddr;
328 return NULL;
329 }
330
inet_v6_ipv6only(const struct sock * sk)331 static inline int inet_v6_ipv6only(const struct sock *sk)
332 {
333 /* ipv6only field is at same position for timewait and other sockets */
334 return ipv6_only_sock(sk);
335 }
336 #else
337 #define ipv6_only_sock(sk) 0
338 #define ipv6_sk_rxinfo(sk) 0
339
ipv6_mod_enabled(void)340 static inline bool ipv6_mod_enabled(void)
341 {
342 return false;
343 }
344
inet6_sk(const struct sock * __sk)345 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
346 {
347 return NULL;
348 }
349
raw6_sk(const struct sock * sk)350 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
351 {
352 return NULL;
353 }
354
355 #define inet6_rcv_saddr(__sk) NULL
356 #define inet_v6_ipv6only(__sk) 0
357 #endif /* IS_ENABLED(CONFIG_IPV6) */
358 #endif /* _IPV6_H */
359