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 *; |
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 | |
106 | static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb) |
107 | { |
108 | return (struct ipv6hdr *)skb_network_header(skb); |
109 | } |
110 | |
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 | |
116 | static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb) |
117 | { |
118 | return (struct ipv6hdr *)skb_transport_header(skb); |
119 | } |
120 | |
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) |
161 | static inline bool ipv6_l3mdev_skb(__u16 flags) |
162 | { |
163 | return flags & IP6SKB_L3SLAVE; |
164 | } |
165 | #else |
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 | |
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 | |
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 */ |
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 (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 | |
319 | static inline struct ipv6_pinfo *inet6_sk(const struct sock *__sk) |
320 | { |
321 | return sk_fullsock(sk: __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 | |
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 | |
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 | |
346 | static inline bool ipv6_mod_enabled(void) |
347 | { |
348 | return false; |
349 | } |
350 | |
351 | static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk) |
352 | { |
353 | return NULL; |
354 | } |
355 | |
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 | |