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14c85021 ACM |
1 | /* |
2 | * INET An implementation of the TCP/IP protocol suite for the LINUX | |
3 | * operating system. INET is implemented using the BSD Socket | |
4 | * interface as the means of communication with the user level. | |
5 | * | |
6 | * Definitions for inet_sock | |
7 | * | |
8 | * Authors: Many, reorganised here by | |
9 | * Arnaldo Carvalho de Melo <acme@mandriva.com> | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or | |
12 | * modify it under the terms of the GNU General Public License | |
13 | * as published by the Free Software Foundation; either version | |
14 | * 2 of the License, or (at your option) any later version. | |
15 | */ | |
16 | #ifndef _INET_SOCK_H | |
17 | #define _INET_SOCK_H | |
18 | ||
c44d13d6 | 19 | #include <linux/bitops.h> |
45e3ff82 | 20 | #include <linux/kmemcheck.h> |
14c85021 ACM |
21 | #include <linux/string.h> |
22 | #include <linux/types.h> | |
b3da2cf3 | 23 | #include <linux/jhash.h> |
fec5e652 | 24 | #include <linux/netdevice.h> |
14c85021 ACM |
25 | |
26 | #include <net/flow.h> | |
27 | #include <net/sock.h> | |
28 | #include <net/request_sock.h> | |
0b441916 | 29 | #include <net/netns/hash.h> |
d34ac51b | 30 | #include <net/tcp_states.h> |
6dd9a14e | 31 | #include <net/l3mdev.h> |
14c85021 ACM |
32 | |
33 | /** struct ip_options - IP Options | |
34 | * | |
35 | * @faddr - Saved first hop address | |
ac8a4810 | 36 | * @nexthop - Saved nexthop address in LSRR and SSRR |
14c85021 ACM |
37 | * @is_strictroute - Strict source route |
38 | * @srr_is_hit - Packet destination addr was our one | |
39 | * @is_changed - IP checksum more not valid | |
40 | * @rr_needaddr - Need to record addr of outgoing dev | |
41 | * @ts_needtime - Need to record timestamp | |
42 | * @ts_needaddr - Need to record addr of outgoing dev | |
43 | */ | |
44 | struct ip_options { | |
3ca3c68e | 45 | __be32 faddr; |
ac8a4810 | 46 | __be32 nexthop; |
14c85021 ACM |
47 | unsigned char optlen; |
48 | unsigned char srr; | |
49 | unsigned char rr; | |
50 | unsigned char ts; | |
ef722495 | 51 | unsigned char is_strictroute:1, |
14c85021 ACM |
52 | srr_is_hit:1, |
53 | is_changed:1, | |
54 | rr_needaddr:1, | |
55 | ts_needtime:1, | |
56 | ts_needaddr:1; | |
57 | unsigned char router_alert; | |
11a03f78 | 58 | unsigned char cipso; |
14c85021 ACM |
59 | unsigned char __pad2; |
60 | unsigned char __data[0]; | |
61 | }; | |
62 | ||
f6d8bd05 ED |
63 | struct ip_options_rcu { |
64 | struct rcu_head rcu; | |
65 | struct ip_options opt; | |
66 | }; | |
67 | ||
68 | struct ip_options_data { | |
69 | struct ip_options_rcu opt; | |
70 | char data[40]; | |
71 | }; | |
14c85021 ACM |
72 | |
73 | struct inet_request_sock { | |
74 | struct request_sock req; | |
634fb979 ED |
75 | #define ir_loc_addr req.__req_common.skc_rcv_saddr |
76 | #define ir_rmt_addr req.__req_common.skc_daddr | |
b44084c2 | 77 | #define ir_num req.__req_common.skc_num |
634fb979 ED |
78 | #define ir_rmt_port req.__req_common.skc_dport |
79 | #define ir_v6_rmt_addr req.__req_common.skc_v6_daddr | |
80 | #define ir_v6_loc_addr req.__req_common.skc_v6_rcv_saddr | |
81 | #define ir_iif req.__req_common.skc_bound_dev_if | |
33cf7c90 ED |
82 | #define ir_cookie req.__req_common.skc_cookie |
83 | #define ireq_net req.__req_common.skc_net | |
d34ac51b | 84 | #define ireq_state req.__req_common.skc_state |
3f66b083 | 85 | #define ireq_family req.__req_common.skc_family |
634fb979 | 86 | |
45e3ff82 VN |
87 | kmemcheck_bitfield_begin(flags); |
88 | u16 snd_wscale : 4, | |
89 | rcv_wscale : 4, | |
14c85021 ACM |
90 | tstamp_ok : 1, |
91 | sack_ok : 1, | |
92 | wscale_ok : 1, | |
93 | ecn_ok : 1, | |
88ef4a5a KK |
94 | acked : 1, |
95 | no_srccheck: 1; | |
45e3ff82 | 96 | kmemcheck_bitfield_end(flags); |
adc17d6a | 97 | u32 ir_mark; |
476eab82 OP |
98 | union { |
99 | struct ip_options_rcu *opt; | |
100 | struct sk_buff *pktopts; | |
101 | }; | |
14c85021 ACM |
102 | }; |
103 | ||
104 | static inline struct inet_request_sock *inet_rsk(const struct request_sock *sk) | |
105 | { | |
106 | return (struct inet_request_sock *)sk; | |
107 | } | |
108 | ||
adc17d6a | 109 | static inline u32 inet_request_mark(const struct sock *sk, struct sk_buff *skb) |
84f39b08 | 110 | { |
adc17d6a | 111 | if (!sk->sk_mark && sock_net(sk)->ipv4.sysctl_tcp_fwmark_accept) |
84f39b08 | 112 | return skb->mark; |
adc17d6a ED |
113 | |
114 | return sk->sk_mark; | |
84f39b08 LC |
115 | } |
116 | ||
6dd9a14e DA |
117 | static inline int inet_request_bound_dev_if(const struct sock *sk, |
118 | struct sk_buff *skb) | |
119 | { | |
120 | #ifdef CONFIG_NET_L3_MASTER_DEV | |
121 | struct net *net = sock_net(sk); | |
122 | ||
123 | if (!sk->sk_bound_dev_if && net->ipv4.sysctl_tcp_l3mdev_accept) | |
124 | return l3mdev_master_ifindex_by_index(net, skb->skb_iif); | |
125 | #endif | |
126 | ||
127 | return sk->sk_bound_dev_if; | |
128 | } | |
129 | ||
1470ddf7 HX |
130 | struct inet_cork { |
131 | unsigned int flags; | |
bdc712b4 | 132 | __be32 addr; |
1470ddf7 | 133 | struct ip_options *opt; |
bdc712b4 | 134 | unsigned int fragsize; |
1470ddf7 | 135 | int length; /* Total length of all frames */ |
5640f768 | 136 | struct dst_entry *dst; |
1470ddf7 | 137 | u8 tx_flags; |
aa661581 FF |
138 | __u8 ttl; |
139 | __s16 tos; | |
140 | char priority; | |
1470ddf7 HX |
141 | }; |
142 | ||
bdc712b4 DM |
143 | struct inet_cork_full { |
144 | struct inet_cork base; | |
145 | struct flowi fl; | |
146 | }; | |
147 | ||
14c85021 ACM |
148 | struct ip_mc_socklist; |
149 | struct ipv6_pinfo; | |
150 | struct rtable; | |
151 | ||
152 | /** struct inet_sock - representation of INET sockets | |
153 | * | |
154 | * @sk - ancestor class | |
155 | * @pinet6 - pointer to IPv6 control block | |
c720c7e8 ED |
156 | * @inet_daddr - Foreign IPv4 addr |
157 | * @inet_rcv_saddr - Bound local IPv4 addr | |
158 | * @inet_dport - Destination port | |
159 | * @inet_num - Local port | |
160 | * @inet_saddr - Sending source | |
14c85021 | 161 | * @uc_ttl - Unicast TTL |
c720c7e8 ED |
162 | * @inet_sport - Source port |
163 | * @inet_id - ID counter for DF pkts | |
14c85021 ACM |
164 | * @tos - TOS |
165 | * @mc_ttl - Multicasting TTL | |
166 | * @is_icsk - is this an inet_connection_sock? | |
76e21053 | 167 | * @uc_index - Unicast outgoing device index |
14c85021 ACM |
168 | * @mc_index - Multicast device index |
169 | * @mc_list - Group array | |
170 | * @cork - info to build ip hdr on each ip frag while socket is corked | |
171 | */ | |
172 | struct inet_sock { | |
173 | /* sk and pinet6 has to be the first two members of inet_sock */ | |
174 | struct sock sk; | |
dfd56b8b | 175 | #if IS_ENABLED(CONFIG_IPV6) |
14c85021 ACM |
176 | struct ipv6_pinfo *pinet6; |
177 | #endif | |
178 | /* Socket demultiplex comparisons on incoming packets. */ | |
68835aba ED |
179 | #define inet_daddr sk.__sk_common.skc_daddr |
180 | #define inet_rcv_saddr sk.__sk_common.skc_rcv_saddr | |
ce43b03e ED |
181 | #define inet_dport sk.__sk_common.skc_dport |
182 | #define inet_num sk.__sk_common.skc_num | |
68835aba | 183 | |
c720c7e8 | 184 | __be32 inet_saddr; |
14c85021 ACM |
185 | __s16 uc_ttl; |
186 | __u16 cmsg_flags; | |
c720c7e8 ED |
187 | __be16 inet_sport; |
188 | __u16 inet_id; | |
d218d111 | 189 | |
f6d8bd05 | 190 | struct ip_options_rcu __rcu *inet_opt; |
ce43b03e | 191 | int rx_dst_ifindex; |
14c85021 | 192 | __u8 tos; |
d218d111 | 193 | __u8 min_ttl; |
14c85021 ACM |
194 | __u8 mc_ttl; |
195 | __u8 pmtudisc; | |
196 | __u8 recverr:1, | |
197 | is_icsk:1, | |
198 | freebind:1, | |
199 | hdrincl:1, | |
f5715aea | 200 | mc_loop:1, |
f771bef9 | 201 | transparent:1, |
7b2ff18e JO |
202 | mc_all:1, |
203 | nodefrag:1; | |
90c337da | 204 | __u8 bind_address_no_port:1; |
4c507d28 | 205 | __u8 rcv_tos; |
224d019c | 206 | __u8 convert_csum; |
76e21053 | 207 | int uc_index; |
14c85021 | 208 | int mc_index; |
011a9261 | 209 | __be32 mc_addr; |
1d7138de | 210 | struct ip_mc_socklist __rcu *mc_list; |
bdc712b4 | 211 | struct inet_cork_full cork; |
14c85021 ACM |
212 | }; |
213 | ||
214 | #define IPCORK_OPT 1 /* ip-options has been held in ipcork.opt */ | |
215 | #define IPCORK_ALLFRAG 2 /* always fragment (for ipv6 for now) */ | |
216 | ||
c44d13d6 TH |
217 | /* cmsg flags for inet */ |
218 | #define IP_CMSG_PKTINFO BIT(0) | |
219 | #define IP_CMSG_TTL BIT(1) | |
220 | #define IP_CMSG_TOS BIT(2) | |
221 | #define IP_CMSG_RECVOPTS BIT(3) | |
222 | #define IP_CMSG_RETOPTS BIT(4) | |
223 | #define IP_CMSG_PASSSEC BIT(5) | |
224 | #define IP_CMSG_ORIGDSTADDR BIT(6) | |
ad6f939a | 225 | #define IP_CMSG_CHECKSUM BIT(7) |
c44d13d6 | 226 | |
bd5eb35f ED |
227 | /** |
228 | * sk_to_full_sk - Access to a full socket | |
229 | * @sk: pointer to a socket | |
230 | * | |
231 | * SYNACK messages might be attached to request sockets. | |
54abc686 ED |
232 | * Some places want to reach the listener in this case. |
233 | */ | |
bd5eb35f | 234 | static inline struct sock *sk_to_full_sk(struct sock *sk) |
54abc686 | 235 | { |
bd5eb35f | 236 | #ifdef CONFIG_INET |
54abc686 ED |
237 | if (sk && sk->sk_state == TCP_NEW_SYN_RECV) |
238 | sk = inet_reqsk(sk)->rsk_listener; | |
bd5eb35f ED |
239 | #endif |
240 | return sk; | |
241 | } | |
242 | ||
243 | /* sk_to_full_sk() variant with a const argument */ | |
244 | static inline const struct sock *sk_const_to_full_sk(const struct sock *sk) | |
245 | { | |
246 | #ifdef CONFIG_INET | |
247 | if (sk && sk->sk_state == TCP_NEW_SYN_RECV) | |
248 | sk = ((const struct request_sock *)sk)->rsk_listener; | |
249 | #endif | |
54abc686 ED |
250 | return sk; |
251 | } | |
252 | ||
bd5eb35f ED |
253 | static inline struct sock *skb_to_full_sk(const struct sk_buff *skb) |
254 | { | |
255 | return sk_to_full_sk(skb->sk); | |
256 | } | |
257 | ||
14c85021 ACM |
258 | static inline struct inet_sock *inet_sk(const struct sock *sk) |
259 | { | |
260 | return (struct inet_sock *)sk; | |
261 | } | |
262 | ||
263 | static inline void __inet_sk_copy_descendant(struct sock *sk_to, | |
264 | const struct sock *sk_from, | |
265 | const int ancestor_size) | |
266 | { | |
267 | memcpy(inet_sk(sk_to) + 1, inet_sk(sk_from) + 1, | |
268 | sk_from->sk_prot->obj_size - ancestor_size); | |
269 | } | |
dfd56b8b | 270 | #if !(IS_ENABLED(CONFIG_IPV6)) |
14c85021 ACM |
271 | static inline void inet_sk_copy_descendant(struct sock *sk_to, |
272 | const struct sock *sk_from) | |
273 | { | |
274 | __inet_sk_copy_descendant(sk_to, sk_from, sizeof(struct inet_sock)); | |
275 | } | |
276 | #endif | |
277 | ||
1fd51155 | 278 | int inet_sk_rebuild_header(struct sock *sk); |
14c85021 | 279 | |
65cd8033 HFS |
280 | static inline unsigned int __inet_ehashfn(const __be32 laddr, |
281 | const __u16 lport, | |
282 | const __be32 faddr, | |
283 | const __be16 fport, | |
284 | u32 initval) | |
14c85021 | 285 | { |
7adc3830 DM |
286 | return jhash_3words((__force __u32) laddr, |
287 | (__force __u32) faddr, | |
b3da2cf3 | 288 | ((__u32) lport) << 16 | (__force __u32)fport, |
65cd8033 | 289 | initval); |
14c85021 ACM |
290 | } |
291 | ||
e49bb337 | 292 | struct request_sock *inet_reqsk_alloc(const struct request_sock_ops *ops, |
a1a5344d ED |
293 | struct sock *sk_listener, |
294 | bool attach_listener); | |
ce4a7d0d | 295 | |
88ef4a5a KK |
296 | static inline __u8 inet_sk_flowi_flags(const struct sock *sk) |
297 | { | |
a4daad6b DM |
298 | __u8 flags = 0; |
299 | ||
47670b76 | 300 | if (inet_sk(sk)->transparent || inet_sk(sk)->hdrincl) |
a4daad6b | 301 | flags |= FLOWI_FLAG_ANYSRC; |
a4daad6b | 302 | return flags; |
88ef4a5a KK |
303 | } |
304 | ||
224d019c TH |
305 | static inline void inet_inc_convert_csum(struct sock *sk) |
306 | { | |
307 | inet_sk(sk)->convert_csum++; | |
308 | } | |
309 | ||
310 | static inline void inet_dec_convert_csum(struct sock *sk) | |
311 | { | |
312 | if (inet_sk(sk)->convert_csum > 0) | |
313 | inet_sk(sk)->convert_csum--; | |
314 | } | |
315 | ||
316 | static inline bool inet_get_convert_csum(struct sock *sk) | |
317 | { | |
318 | return !!inet_sk(sk)->convert_csum; | |
319 | } | |
320 | ||
14c85021 | 321 | #endif /* _INET_SOCK_H */ |