xref: /openbmc/linux/include/net/inet_sock.h (revision d2999e1b)
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 
19 
20 #include <linux/kmemcheck.h>
21 #include <linux/string.h>
22 #include <linux/types.h>
23 #include <linux/jhash.h>
24 #include <linux/netdevice.h>
25 
26 #include <net/flow.h>
27 #include <net/sock.h>
28 #include <net/request_sock.h>
29 #include <net/netns/hash.h>
30 
31 /** struct ip_options - IP Options
32  *
33  * @faddr - Saved first hop address
34  * @nexthop - Saved nexthop address in LSRR and SSRR
35  * @is_strictroute - Strict source route
36  * @srr_is_hit - Packet destination addr was our one
37  * @is_changed - IP checksum more not valid
38  * @rr_needaddr - Need to record addr of outgoing dev
39  * @ts_needtime - Need to record timestamp
40  * @ts_needaddr - Need to record addr of outgoing dev
41  */
42 struct ip_options {
43 	__be32		faddr;
44 	__be32		nexthop;
45 	unsigned char	optlen;
46 	unsigned char	srr;
47 	unsigned char	rr;
48 	unsigned char	ts;
49 	unsigned char	is_strictroute:1,
50 			srr_is_hit:1,
51 			is_changed:1,
52 			rr_needaddr:1,
53 			ts_needtime:1,
54 			ts_needaddr:1;
55 	unsigned char	router_alert;
56 	unsigned char	cipso;
57 	unsigned char	__pad2;
58 	unsigned char	__data[0];
59 };
60 
61 struct ip_options_rcu {
62 	struct rcu_head rcu;
63 	struct ip_options opt;
64 };
65 
66 struct ip_options_data {
67 	struct ip_options_rcu	opt;
68 	char			data[40];
69 };
70 
71 struct inet_request_sock {
72 	struct request_sock	req;
73 #define ir_loc_addr		req.__req_common.skc_rcv_saddr
74 #define ir_rmt_addr		req.__req_common.skc_daddr
75 #define ir_num			req.__req_common.skc_num
76 #define ir_rmt_port		req.__req_common.skc_dport
77 #define ir_v6_rmt_addr		req.__req_common.skc_v6_daddr
78 #define ir_v6_loc_addr		req.__req_common.skc_v6_rcv_saddr
79 #define ir_iif			req.__req_common.skc_bound_dev_if
80 
81 	kmemcheck_bitfield_begin(flags);
82 	u16			snd_wscale : 4,
83 				rcv_wscale : 4,
84 				tstamp_ok  : 1,
85 				sack_ok	   : 1,
86 				wscale_ok  : 1,
87 				ecn_ok	   : 1,
88 				acked	   : 1,
89 				no_srccheck: 1;
90 	kmemcheck_bitfield_end(flags);
91 	struct ip_options_rcu	*opt;
92 	struct sk_buff		*pktopts;
93 	u32                     ir_mark;
94 };
95 
96 static inline struct inet_request_sock *inet_rsk(const struct request_sock *sk)
97 {
98 	return (struct inet_request_sock *)sk;
99 }
100 
101 static inline u32 inet_request_mark(struct sock *sk, struct sk_buff *skb)
102 {
103 	if (!sk->sk_mark && sock_net(sk)->ipv4.sysctl_tcp_fwmark_accept) {
104 		return skb->mark;
105 	} else {
106 		return sk->sk_mark;
107 	}
108 }
109 
110 struct inet_cork {
111 	unsigned int		flags;
112 	__be32			addr;
113 	struct ip_options	*opt;
114 	unsigned int		fragsize;
115 	int			length; /* Total length of all frames */
116 	struct dst_entry	*dst;
117 	u8			tx_flags;
118 	__u8			ttl;
119 	__s16			tos;
120 	char			priority;
121 };
122 
123 struct inet_cork_full {
124 	struct inet_cork	base;
125 	struct flowi		fl;
126 };
127 
128 struct ip_mc_socklist;
129 struct ipv6_pinfo;
130 struct rtable;
131 
132 /** struct inet_sock - representation of INET sockets
133  *
134  * @sk - ancestor class
135  * @pinet6 - pointer to IPv6 control block
136  * @inet_daddr - Foreign IPv4 addr
137  * @inet_rcv_saddr - Bound local IPv4 addr
138  * @inet_dport - Destination port
139  * @inet_num - Local port
140  * @inet_saddr - Sending source
141  * @uc_ttl - Unicast TTL
142  * @inet_sport - Source port
143  * @inet_id - ID counter for DF pkts
144  * @tos - TOS
145  * @mc_ttl - Multicasting TTL
146  * @is_icsk - is this an inet_connection_sock?
147  * @uc_index - Unicast outgoing device index
148  * @mc_index - Multicast device index
149  * @mc_list - Group array
150  * @cork - info to build ip hdr on each ip frag while socket is corked
151  */
152 struct inet_sock {
153 	/* sk and pinet6 has to be the first two members of inet_sock */
154 	struct sock		sk;
155 #if IS_ENABLED(CONFIG_IPV6)
156 	struct ipv6_pinfo	*pinet6;
157 #endif
158 	/* Socket demultiplex comparisons on incoming packets. */
159 #define inet_daddr		sk.__sk_common.skc_daddr
160 #define inet_rcv_saddr		sk.__sk_common.skc_rcv_saddr
161 #define inet_dport		sk.__sk_common.skc_dport
162 #define inet_num		sk.__sk_common.skc_num
163 
164 	__be32			inet_saddr;
165 	__s16			uc_ttl;
166 	__u16			cmsg_flags;
167 	__be16			inet_sport;
168 	__u16			inet_id;
169 
170 	struct ip_options_rcu __rcu	*inet_opt;
171 	int			rx_dst_ifindex;
172 	__u8			tos;
173 	__u8			min_ttl;
174 	__u8			mc_ttl;
175 	__u8			pmtudisc;
176 	__u8			recverr:1,
177 				is_icsk:1,
178 				freebind:1,
179 				hdrincl:1,
180 				mc_loop:1,
181 				transparent:1,
182 				mc_all:1,
183 				nodefrag:1;
184 	__u8			rcv_tos;
185 	int			uc_index;
186 	int			mc_index;
187 	__be32			mc_addr;
188 	struct ip_mc_socklist __rcu	*mc_list;
189 	struct inet_cork_full	cork;
190 };
191 
192 #define IPCORK_OPT	1	/* ip-options has been held in ipcork.opt */
193 #define IPCORK_ALLFRAG	2	/* always fragment (for ipv6 for now) */
194 
195 static inline struct inet_sock *inet_sk(const struct sock *sk)
196 {
197 	return (struct inet_sock *)sk;
198 }
199 
200 static inline void __inet_sk_copy_descendant(struct sock *sk_to,
201 					     const struct sock *sk_from,
202 					     const int ancestor_size)
203 {
204 	memcpy(inet_sk(sk_to) + 1, inet_sk(sk_from) + 1,
205 	       sk_from->sk_prot->obj_size - ancestor_size);
206 }
207 #if !(IS_ENABLED(CONFIG_IPV6))
208 static inline void inet_sk_copy_descendant(struct sock *sk_to,
209 					   const struct sock *sk_from)
210 {
211 	__inet_sk_copy_descendant(sk_to, sk_from, sizeof(struct inet_sock));
212 }
213 #endif
214 
215 int inet_sk_rebuild_header(struct sock *sk);
216 
217 static inline unsigned int __inet_ehashfn(const __be32 laddr,
218 					  const __u16 lport,
219 					  const __be32 faddr,
220 					  const __be16 fport,
221 					  u32 initval)
222 {
223 	return jhash_3words((__force __u32) laddr,
224 			    (__force __u32) faddr,
225 			    ((__u32) lport) << 16 | (__force __u32)fport,
226 			    initval);
227 }
228 
229 static inline struct request_sock *inet_reqsk_alloc(struct request_sock_ops *ops)
230 {
231 	struct request_sock *req = reqsk_alloc(ops);
232 	struct inet_request_sock *ireq = inet_rsk(req);
233 
234 	if (req != NULL) {
235 		kmemcheck_annotate_bitfield(ireq, flags);
236 		ireq->opt = NULL;
237 	}
238 
239 	return req;
240 }
241 
242 static inline __u8 inet_sk_flowi_flags(const struct sock *sk)
243 {
244 	__u8 flags = 0;
245 
246 	if (inet_sk(sk)->transparent || inet_sk(sk)->hdrincl)
247 		flags |= FLOWI_FLAG_ANYSRC;
248 	return flags;
249 }
250 
251 #endif	/* _INET_SOCK_H */
252