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#include <linux/bitops.h> 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#include <net/tcp_states.h> 31 32/** struct ip_options - IP Options 33 * 34 * @faddr - Saved first hop address 35 * @nexthop - Saved nexthop address in LSRR and SSRR 36 * @is_strictroute - Strict source route 37 * @srr_is_hit - Packet destination addr was our one 38 * @is_changed - IP checksum more not valid 39 * @rr_needaddr - Need to record addr of outgoing dev 40 * @ts_needtime - Need to record timestamp 41 * @ts_needaddr - Need to record addr of outgoing dev 42 */ 43struct ip_options { 44 __be32 faddr; 45 __be32 nexthop; 46 unsigned char optlen; 47 unsigned char srr; 48 unsigned char rr; 49 unsigned char ts; 50 unsigned char is_strictroute:1, 51 srr_is_hit:1, 52 is_changed:1, 53 rr_needaddr:1, 54 ts_needtime:1, 55 ts_needaddr:1; 56 unsigned char router_alert; 57 unsigned char cipso; 58 unsigned char __pad2; 59 unsigned char __data[0]; 60}; 61 62struct ip_options_rcu { 63 struct rcu_head rcu; 64 struct ip_options opt; 65}; 66 67struct ip_options_data { 68 struct ip_options_rcu opt; 69 char data[40]; 70}; 71 72struct inet_request_sock { 73 struct request_sock req; 74#define ir_loc_addr req.__req_common.skc_rcv_saddr 75#define ir_rmt_addr req.__req_common.skc_daddr 76#define ir_num req.__req_common.skc_num 77#define ir_rmt_port req.__req_common.skc_dport 78#define ir_v6_rmt_addr req.__req_common.skc_v6_daddr 79#define ir_v6_loc_addr req.__req_common.skc_v6_rcv_saddr 80#define ir_iif req.__req_common.skc_bound_dev_if 81#define ir_cookie req.__req_common.skc_cookie 82#define ireq_net req.__req_common.skc_net 83#define ireq_state req.__req_common.skc_state 84#define ireq_family req.__req_common.skc_family 85 86 kmemcheck_bitfield_begin(flags); 87 u16 snd_wscale : 4, 88 rcv_wscale : 4, 89 tstamp_ok : 1, 90 sack_ok : 1, 91 wscale_ok : 1, 92 ecn_ok : 1, 93 acked : 1, 94 no_srccheck: 1; 95 kmemcheck_bitfield_end(flags); 96 u32 ir_mark; 97 union { 98 struct ip_options_rcu *opt; 99 struct sk_buff *pktopts; 100 }; 101}; 102 103static inline struct inet_request_sock *inet_rsk(const struct request_sock *sk) 104{ 105 return (struct inet_request_sock *)sk; 106} 107 108static inline u32 inet_request_mark(const struct sock *sk, struct sk_buff *skb) 109{ 110 if (!sk->sk_mark && sock_net(sk)->ipv4.sysctl_tcp_fwmark_accept) 111 return skb->mark; 112 113 return sk->sk_mark; 114} 115 116struct inet_cork { 117 unsigned int flags; 118 __be32 addr; 119 struct ip_options *opt; 120 unsigned int fragsize; 121 int length; /* Total length of all frames */ 122 struct dst_entry *dst; 123 u8 tx_flags; 124 __u8 ttl; 125 __s16 tos; 126 char priority; 127}; 128 129struct inet_cork_full { 130 struct inet_cork base; 131 struct flowi fl; 132}; 133 134struct ip_mc_socklist; 135struct ipv6_pinfo; 136struct rtable; 137 138/** struct inet_sock - representation of INET sockets 139 * 140 * @sk - ancestor class 141 * @pinet6 - pointer to IPv6 control block 142 * @inet_daddr - Foreign IPv4 addr 143 * @inet_rcv_saddr - Bound local IPv4 addr 144 * @inet_dport - Destination port 145 * @inet_num - Local port 146 * @inet_saddr - Sending source 147 * @uc_ttl - Unicast TTL 148 * @inet_sport - Source port 149 * @inet_id - ID counter for DF pkts 150 * @tos - TOS 151 * @mc_ttl - Multicasting TTL 152 * @is_icsk - is this an inet_connection_sock? 153 * @uc_index - Unicast outgoing device index 154 * @mc_index - Multicast device index 155 * @mc_list - Group array 156 * @cork - info to build ip hdr on each ip frag while socket is corked 157 */ 158struct inet_sock { 159 /* sk and pinet6 has to be the first two members of inet_sock */ 160 struct sock sk; 161#if IS_ENABLED(CONFIG_IPV6) 162 struct ipv6_pinfo *pinet6; 163#endif 164 /* Socket demultiplex comparisons on incoming packets. */ 165#define inet_daddr sk.__sk_common.skc_daddr 166#define inet_rcv_saddr sk.__sk_common.skc_rcv_saddr 167#define inet_dport sk.__sk_common.skc_dport 168#define inet_num sk.__sk_common.skc_num 169 170 __be32 inet_saddr; 171 __s16 uc_ttl; 172 __u16 cmsg_flags; 173 __be16 inet_sport; 174 __u16 inet_id; 175 176 struct ip_options_rcu __rcu *inet_opt; 177 int rx_dst_ifindex; 178 __u8 tos; 179 __u8 min_ttl; 180 __u8 mc_ttl; 181 __u8 pmtudisc; 182 __u8 recverr:1, 183 is_icsk:1, 184 freebind:1, 185 hdrincl:1, 186 mc_loop:1, 187 transparent:1, 188 mc_all:1, 189 nodefrag:1; 190 __u8 rcv_tos; 191 __u8 convert_csum; 192 int uc_index; 193 int mc_index; 194 __be32 mc_addr; 195 struct ip_mc_socklist __rcu *mc_list; 196 struct inet_cork_full cork; 197}; 198 199#define IPCORK_OPT 1 /* ip-options has been held in ipcork.opt */ 200#define IPCORK_ALLFRAG 2 /* always fragment (for ipv6 for now) */ 201 202/* cmsg flags for inet */ 203#define IP_CMSG_PKTINFO BIT(0) 204#define IP_CMSG_TTL BIT(1) 205#define IP_CMSG_TOS BIT(2) 206#define IP_CMSG_RECVOPTS BIT(3) 207#define IP_CMSG_RETOPTS BIT(4) 208#define IP_CMSG_PASSSEC BIT(5) 209#define IP_CMSG_ORIGDSTADDR BIT(6) 210#define IP_CMSG_CHECKSUM BIT(7) 211 212static inline struct inet_sock *inet_sk(const struct sock *sk) 213{ 214 return (struct inet_sock *)sk; 215} 216 217static inline void __inet_sk_copy_descendant(struct sock *sk_to, 218 const struct sock *sk_from, 219 const int ancestor_size) 220{ 221 memcpy(inet_sk(sk_to) + 1, inet_sk(sk_from) + 1, 222 sk_from->sk_prot->obj_size - ancestor_size); 223} 224#if !(IS_ENABLED(CONFIG_IPV6)) 225static inline void inet_sk_copy_descendant(struct sock *sk_to, 226 const struct sock *sk_from) 227{ 228 __inet_sk_copy_descendant(sk_to, sk_from, sizeof(struct inet_sock)); 229} 230#endif 231 232int inet_sk_rebuild_header(struct sock *sk); 233 234static inline unsigned int __inet_ehashfn(const __be32 laddr, 235 const __u16 lport, 236 const __be32 faddr, 237 const __be16 fport, 238 u32 initval) 239{ 240 return jhash_3words((__force __u32) laddr, 241 (__force __u32) faddr, 242 ((__u32) lport) << 16 | (__force __u32)fport, 243 initval); 244} 245 246struct request_sock *inet_reqsk_alloc(const struct request_sock_ops *ops, 247 struct sock *sk_listener); 248 249static inline __u8 inet_sk_flowi_flags(const struct sock *sk) 250{ 251 __u8 flags = 0; 252 253 if (inet_sk(sk)->transparent || inet_sk(sk)->hdrincl) 254 flags |= FLOWI_FLAG_ANYSRC; 255 return flags; 256} 257 258static inline void inet_inc_convert_csum(struct sock *sk) 259{ 260 inet_sk(sk)->convert_csum++; 261} 262 263static inline void inet_dec_convert_csum(struct sock *sk) 264{ 265 if (inet_sk(sk)->convert_csum > 0) 266 inet_sk(sk)->convert_csum--; 267} 268 269static inline bool inet_get_convert_csum(struct sock *sk) 270{ 271 return !!inet_sk(sk)->convert_csum; 272} 273 274#endif /* _INET_SOCK_H */ 275