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
93 struct ctl_table_header *sysctl_header;
94 };
95
96 struct ipv6_params {
97 __s32 disable_ipv6;
98 __s32 autoconf;
99 };
100 extern struct ipv6_params ipv6_defaults;
101 #include <linux/tcp.h>
102 #include <linux/udp.h>
103
104 #include <net/inet_sock.h>
105
ipv6_hdr(const struct sk_buff * skb)106 static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb)
107 {
108 return (struct ipv6hdr *)skb_network_header(skb);
109 }
110
inner_ipv6_hdr(const struct sk_buff * skb)111 static inline struct ipv6hdr *inner_ipv6_hdr(const struct sk_buff *skb)
112 {
113 return (struct ipv6hdr *)skb_inner_network_header(skb);
114 }
115
ipipv6_hdr(const struct sk_buff * skb)116 static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb)
117 {
118 return (struct ipv6hdr *)skb_transport_header(skb);
119 }
120
ipv6_transport_len(const struct sk_buff * skb)121 static 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
132 struct 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)
ipv6_l3mdev_skb(__u16 flags)161 static inline bool ipv6_l3mdev_skb(__u16 flags)
162 {
163 return flags & IP6SKB_L3SLAVE;
164 }
165 #else
ipv6_l3mdev_skb(__u16 flags)166 static 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
inet6_iif(const struct sk_buff * skb)175 static 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
inet6_is_jumbogram(const struct sk_buff * skb)182 static 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 */
inet6_sdif(const struct sk_buff * skb)188 static 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
197 struct tcp6_request_sock {
198 struct tcp_request_sock tcp6rsk_tcp;
199 };
200
201 struct ipv6_mc_socklist;
202 struct ipv6_ac_socklist;
203 struct ipv6_fl_socklist;
204
205 struct inet6_cork {
206 struct ipv6_txoptions *opt;
207 u8 hop_limit;
208 u8 tclass;
209 };
210
211 /* struct ipv6_pinfo - ipv6 private area */
212 struct 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! */
287 struct 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
298 struct udp6_sock {
299 struct udp_sock udp;
300
301 struct ipv6_pinfo inet6;
302 };
303
304 struct tcp6_sock {
305 struct tcp_sock tcp;
306
307 struct ipv6_pinfo inet6;
308 };
309
310 extern int inet6_sk_rebuild_header(struct sock *sk);
311
312 struct tcp6_timewait_sock {
313 struct tcp_timewait_sock tcp6tw_tcp;
314 };
315
316 #if IS_ENABLED(CONFIG_IPV6)
317 bool ipv6_mod_enabled(void);
318
inet6_sk(const struct sock * __sk)319 static 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
inet6_rcv_saddr(const struct sock * sk)330 static 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
inet_v6_ipv6only(const struct sock * sk)337 static 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
ipv6_mod_enabled(void)346 static inline bool ipv6_mod_enabled(void)
347 {
348 return false;
349 }
350
inet6_sk(const struct sock * __sk)351 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
352 {
353 return NULL;
354 }
355
raw6_sk(const struct sock * sk)356 static 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