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 __u8 ra_honor_pio_pflag;
93
94 struct ctl_table_header *sysctl_header;
95};
96
97struct ipv6_params {
98 __s32 disable_ipv6;
99 __s32 autoconf;
100};
101extern struct ipv6_params ipv6_defaults;
102#include <linux/tcp.h>
103#include <linux/udp.h>
104
105#include <net/inet_sock.h>
106
107static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb)
108{
109 return (struct ipv6hdr *)skb_network_header(skb);
110}
111
112static inline struct ipv6hdr *inner_ipv6_hdr(const struct sk_buff *skb)
113{
114 return (struct ipv6hdr *)skb_inner_network_header(skb);
115}
116
117static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb)
118{
119 return (struct ipv6hdr *)skb_transport_header(skb);
120}
121
122static 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
133struct 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)
162static inline bool ipv6_l3mdev_skb(__u16 flags)
163{
164 return flags & IP6SKB_L3SLAVE;
165}
166#else
167static 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
176static 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
183static 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 */
189static 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
198struct tcp6_request_sock {
199 struct tcp_request_sock tcp6rsk_tcp;
200};
201
202struct ipv6_mc_socklist;
203struct ipv6_ac_socklist;
204struct ipv6_fl_socklist;
205
206struct 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 */
214struct 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! */
289struct 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
300struct udp6_sock {
301 struct udp_sock udp;
302
303 struct ipv6_pinfo inet6;
304};
305
306struct tcp6_sock {
307 struct tcp_sock tcp;
308
309 struct ipv6_pinfo inet6;
310};
311
312extern int inet6_sk_rebuild_header(struct sock *sk);
313
314struct tcp6_timewait_sock {
315 struct tcp_timewait_sock tcp6tw_tcp;
316};
317
318#if IS_ENABLED(CONFIG_IPV6)
319bool ipv6_mod_enabled(void);
320
321static inline struct ipv6_pinfo *inet6_sk(const struct sock *__sk)
322{
323 return sk_fullsock(sk: __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
332static 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
339static 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
348static inline bool ipv6_mod_enabled(void)
349{
350 return false;
351}
352
353static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
354{
355 return NULL;
356}
357
358static 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

source code of linux/include/linux/ipv6.h

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