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 */
13 struct 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 __u8 ra_honor_pio_pflag;
93
94 struct ctl_table_header *sysctl_header;
95 };
96
97 struct ipv6_params {
98 __s32 disable_ipv6;
99 __s32 autoconf;
100 };
101 extern struct ipv6_params ipv6_defaults;
102 #include <linux/tcp.h>
103 #include <linux/udp.h>
104
105 #include <net/inet_sock.h>
106
ipv6_hdr(const struct sk_buff * skb)107 static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb)
108 {
109 return (struct ipv6hdr *)skb_network_header(skb);
110 }
111
inner_ipv6_hdr(const struct sk_buff * skb)112 static inline struct ipv6hdr *inner_ipv6_hdr(const struct sk_buff *skb)
113 {
114 return (struct ipv6hdr *)skb_inner_network_header(skb);
115 }
116
ipipv6_hdr(const struct sk_buff * skb)117 static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb)
118 {
119 return (struct ipv6hdr *)skb_transport_header(skb);
120 }
121
ipv6_transport_len(const struct sk_buff * skb)122 static inline unsigned int ipv6_transport_len(const struct sk_buff *skb)
123 {
124 return ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr) -
125 skb_network_header_len(skb);
126 }
127
128 /*
129 This structure contains results of exthdrs parsing
130 as offsets from skb->nh.
131 */
132
133 struct inet6_skb_parm {
134 int iif;
135 __be16 ra;
136 __u16 dst0;
137 __u16 srcrt;
138 __u16 dst1;
139 __u16 lastopt;
140 __u16 nhoff;
141 __u16 flags;
142 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
143 __u16 dsthao;
144 #endif
145 __u16 frag_max_size;
146 __u16 srhoff;
147
148 #define IP6SKB_XFRM_TRANSFORMED 1
149 #define IP6SKB_FORWARDED 2
150 #define IP6SKB_REROUTED 4
151 #define IP6SKB_ROUTERALERT 8
152 #define IP6SKB_FRAGMENTED 16
153 #define IP6SKB_HOPBYHOP 32
154 #define IP6SKB_L3SLAVE 64
155 #define IP6SKB_JUMBOGRAM 128
156 #define IP6SKB_SEG6 256
157 #define IP6SKB_FAKEJUMBO 512
158 #define IP6SKB_MULTIPATH 1024
159 };
160
161 #if defined(CONFIG_NET_L3_MASTER_DEV)
ipv6_l3mdev_skb(__u16 flags)162 static inline bool ipv6_l3mdev_skb(__u16 flags)
163 {
164 return flags & IP6SKB_L3SLAVE;
165 }
166 #else
ipv6_l3mdev_skb(__u16 flags)167 static inline bool ipv6_l3mdev_skb(__u16 flags)
168 {
169 return false;
170 }
171 #endif
172
173 #define IP6CB(skb) ((struct inet6_skb_parm*)((skb)->cb))
174 #define IP6CBMTU(skb) ((struct ip6_mtuinfo *)((skb)->cb))
175
inet6_iif(const struct sk_buff * skb)176 static inline int inet6_iif(const struct sk_buff *skb)
177 {
178 bool l3_slave = ipv6_l3mdev_skb(IP6CB(skb)->flags);
179
180 return l3_slave ? skb->skb_iif : IP6CB(skb)->iif;
181 }
182
inet6_is_jumbogram(const struct sk_buff * skb)183 static inline bool inet6_is_jumbogram(const struct sk_buff *skb)
184 {
185 return !!(IP6CB(skb)->flags & IP6SKB_JUMBOGRAM);
186 }
187
188 /* can not be used in TCP layer after tcp_v6_fill_cb */
inet6_sdif(const struct sk_buff * skb)189 static inline int inet6_sdif(const struct sk_buff *skb)
190 {
191 #if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV)
192 if (skb && ipv6_l3mdev_skb(IP6CB(skb)->flags))
193 return IP6CB(skb)->iif;
194 #endif
195 return 0;
196 }
197
198 struct tcp6_request_sock {
199 struct tcp_request_sock tcp6rsk_tcp;
200 };
201
202 struct ipv6_mc_socklist;
203 struct ipv6_ac_socklist;
204 struct ipv6_fl_socklist;
205
206 struct inet6_cork {
207 struct ipv6_txoptions *opt;
208 u8 hop_limit;
209 u8 tclass;
210 u8 dontfrag:1;
211 };
212
213 /* struct ipv6_pinfo - ipv6 private area */
214 struct ipv6_pinfo {
215 struct in6_addr saddr;
216 struct in6_pktinfo sticky_pktinfo;
217 const struct in6_addr *daddr_cache;
218 #ifdef CONFIG_IPV6_SUBTREES
219 const struct in6_addr *saddr_cache;
220 #endif
221
222 __be32 flow_label;
223 __u32 frag_size;
224
225 s16 hop_limit;
226 u8 mcast_hops;
227
228 int ucast_oif;
229 int mcast_oif;
230
231 /* pktoption flags */
232 union {
233 struct {
234 __u16 srcrt:1,
235 osrcrt:1,
236 rxinfo:1,
237 rxoinfo:1,
238 rxhlim:1,
239 rxohlim:1,
240 hopopts:1,
241 ohopopts:1,
242 dstopts:1,
243 odstopts:1,
244 rxflow:1,
245 rxtclass:1,
246 rxpmtu:1,
247 rxorigdstaddr:1,
248 recvfragsize:1;
249 /* 1 bits hole */
250 } bits;
251 __u16 all;
252 } rxopt;
253
254 /* sockopt flags */
255 __u8 srcprefs; /* 001: prefer temporary address
256 * 010: prefer public address
257 * 100: prefer care-of address
258 */
259 __u8 pmtudisc;
260 __u8 min_hopcount;
261 __u8 tclass;
262 __be32 rcv_flowinfo;
263
264 __u32 dst_cookie;
265
266 struct ipv6_mc_socklist __rcu *ipv6_mc_list;
267 struct ipv6_ac_socklist *ipv6_ac_list;
268 struct ipv6_fl_socklist __rcu *ipv6_fl_list;
269
270 struct ipv6_txoptions __rcu *opt;
271 struct sk_buff *pktoptions;
272 struct sk_buff *rxpmtu;
273 struct inet6_cork cork;
274 };
275
276 /* We currently use available bits from inet_sk(sk)->inet_flags,
277 * this could change in the future.
278 */
279 #define inet6_test_bit(nr, sk) \
280 test_bit(INET_FLAGS_##nr, &inet_sk(sk)->inet_flags)
281 #define inet6_set_bit(nr, sk) \
282 set_bit(INET_FLAGS_##nr, &inet_sk(sk)->inet_flags)
283 #define inet6_clear_bit(nr, sk) \
284 clear_bit(INET_FLAGS_##nr, &inet_sk(sk)->inet_flags)
285 #define inet6_assign_bit(nr, sk, val) \
286 assign_bit(INET_FLAGS_##nr, &inet_sk(sk)->inet_flags, val)
287
288 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
289 struct raw6_sock {
290 /* inet_sock has to be the first member of raw6_sock */
291 struct inet_sock inet;
292 __u32 checksum; /* perform checksum */
293 __u32 offset; /* checksum offset */
294 struct icmp6_filter filter;
295 __u32 ip6mr_table;
296
297 struct ipv6_pinfo inet6;
298 };
299
300 struct udp6_sock {
301 struct udp_sock udp;
302
303 struct ipv6_pinfo inet6;
304 };
305
306 struct tcp6_sock {
307 struct tcp_sock tcp;
308
309 struct ipv6_pinfo inet6;
310 };
311
312 extern int inet6_sk_rebuild_header(struct sock *sk);
313
314 struct tcp6_timewait_sock {
315 struct tcp_timewait_sock tcp6tw_tcp;
316 };
317
318 #if IS_ENABLED(CONFIG_IPV6)
319 bool ipv6_mod_enabled(void);
320
inet6_sk(const struct sock * __sk)321 static inline struct ipv6_pinfo *inet6_sk(const struct sock *__sk)
322 {
323 return sk_fullsock(__sk) ? inet_sk(__sk)->pinet6 : NULL;
324 }
325
326 #define raw6_sk(ptr) container_of_const(ptr, struct raw6_sock, inet.sk)
327
328 #define ipv6_only_sock(sk) (sk->sk_ipv6only)
329 #define ipv6_sk_rxinfo(sk) ((sk)->sk_family == PF_INET6 && \
330 inet6_sk(sk)->rxopt.bits.rxinfo)
331
inet6_rcv_saddr(const struct sock * sk)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
inet_v6_ipv6only(const struct sock * sk)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_sk_rxinfo(sk) 0
347
ipv6_mod_enabled(void)348 static inline bool ipv6_mod_enabled(void)
349 {
350 return false;
351 }
352
inet6_sk(const struct sock * __sk)353 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
354 {
355 return NULL;
356 }
357
raw6_sk(const struct sock * sk)358 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
359 {
360 return NULL;
361 }
362
363 #define inet6_rcv_saddr(__sk) NULL
364 #define inet_v6_ipv6only(__sk) 0
365 #endif /* IS_ENABLED(CONFIG_IPV6) */
366 #endif /* _IPV6_H */
367