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