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/string.h> 21 #include <linux/types.h> 22 #include <linux/jhash.h> 23 24 #include <net/flow.h> 25 #include <net/sock.h> 26 #include <net/request_sock.h> 27 #include <net/netns/hash.h> 28 29 /** struct ip_options - IP Options 30 * 31 * @faddr - Saved first hop address 32 * @is_data - Options in __data, rather than skb 33 * @is_strictroute - Strict source route 34 * @srr_is_hit - Packet destination addr was our one 35 * @is_changed - IP checksum more not valid 36 * @rr_needaddr - Need to record addr of outgoing dev 37 * @ts_needtime - Need to record timestamp 38 * @ts_needaddr - Need to record addr of outgoing dev 39 */ 40 struct ip_options { 41 __be32 faddr; 42 unsigned char optlen; 43 unsigned char srr; 44 unsigned char rr; 45 unsigned char ts; 46 unsigned char is_strictroute:1, 47 srr_is_hit:1, 48 is_changed:1, 49 rr_needaddr:1, 50 ts_needtime:1, 51 ts_needaddr:1; 52 unsigned char router_alert; 53 unsigned char cipso; 54 unsigned char __pad2; 55 unsigned char __data[0]; 56 }; 57 58 #define optlength(opt) (sizeof(struct ip_options) + opt->optlen) 59 60 struct inet_request_sock { 61 struct request_sock req; 62 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 63 u16 inet6_rsk_offset; 64 #endif 65 __be16 loc_port; 66 __be32 loc_addr; 67 __be32 rmt_addr; 68 __be16 rmt_port; 69 u16 snd_wscale : 4, 70 rcv_wscale : 4, 71 tstamp_ok : 1, 72 sack_ok : 1, 73 wscale_ok : 1, 74 ecn_ok : 1, 75 acked : 1, 76 no_srccheck: 1; 77 struct ip_options *opt; 78 }; 79 80 static inline struct inet_request_sock *inet_rsk(const struct request_sock *sk) 81 { 82 return (struct inet_request_sock *)sk; 83 } 84 85 struct ip_mc_socklist; 86 struct ipv6_pinfo; 87 struct rtable; 88 89 /** struct inet_sock - representation of INET sockets 90 * 91 * @sk - ancestor class 92 * @pinet6 - pointer to IPv6 control block 93 * @daddr - Foreign IPv4 addr 94 * @rcv_saddr - Bound local IPv4 addr 95 * @dport - Destination port 96 * @num - Local port 97 * @saddr - Sending source 98 * @uc_ttl - Unicast TTL 99 * @sport - Source port 100 * @id - ID counter for DF pkts 101 * @tos - TOS 102 * @mc_ttl - Multicasting TTL 103 * @is_icsk - is this an inet_connection_sock? 104 * @mc_index - Multicast device index 105 * @mc_list - Group array 106 * @cork - info to build ip hdr on each ip frag while socket is corked 107 */ 108 struct inet_sock { 109 /* sk and pinet6 has to be the first two members of inet_sock */ 110 struct sock sk; 111 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 112 struct ipv6_pinfo *pinet6; 113 #endif 114 /* Socket demultiplex comparisons on incoming packets. */ 115 __be32 daddr; 116 __be32 rcv_saddr; 117 __be16 dport; 118 __u16 num; 119 __be32 saddr; 120 __s16 uc_ttl; 121 __u16 cmsg_flags; 122 struct ip_options *opt; 123 __be16 sport; 124 __u16 id; 125 __u8 tos; 126 __u8 mc_ttl; 127 __u8 pmtudisc; 128 __u8 recverr:1, 129 is_icsk:1, 130 freebind:1, 131 hdrincl:1, 132 mc_loop:1, 133 transparent:1; 134 int mc_index; 135 __be32 mc_addr; 136 struct ip_mc_socklist *mc_list; 137 struct { 138 unsigned int flags; 139 unsigned int fragsize; 140 struct ip_options *opt; 141 struct dst_entry *dst; 142 int length; /* Total length of all frames */ 143 __be32 addr; 144 struct flowi fl; 145 } cork; 146 }; 147 148 #define IPCORK_OPT 1 /* ip-options has been held in ipcork.opt */ 149 #define IPCORK_ALLFRAG 2 /* always fragment (for ipv6 for now) */ 150 151 static inline struct inet_sock *inet_sk(const struct sock *sk) 152 { 153 return (struct inet_sock *)sk; 154 } 155 156 static inline void __inet_sk_copy_descendant(struct sock *sk_to, 157 const struct sock *sk_from, 158 const int ancestor_size) 159 { 160 memcpy(inet_sk(sk_to) + 1, inet_sk(sk_from) + 1, 161 sk_from->sk_prot->obj_size - ancestor_size); 162 } 163 #if !(defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)) 164 static inline void inet_sk_copy_descendant(struct sock *sk_to, 165 const struct sock *sk_from) 166 { 167 __inet_sk_copy_descendant(sk_to, sk_from, sizeof(struct inet_sock)); 168 } 169 #endif 170 171 extern int inet_sk_rebuild_header(struct sock *sk); 172 173 extern u32 inet_ehash_secret; 174 extern void build_ehash_secret(void); 175 176 static inline unsigned int inet_ehashfn(struct net *net, 177 const __be32 laddr, const __u16 lport, 178 const __be32 faddr, const __be16 fport) 179 { 180 return jhash_3words((__force __u32) laddr, 181 (__force __u32) faddr, 182 ((__u32) lport) << 16 | (__force __u32)fport, 183 inet_ehash_secret + net_hash_mix(net)); 184 } 185 186 static inline int inet_sk_ehashfn(const struct sock *sk) 187 { 188 const struct inet_sock *inet = inet_sk(sk); 189 const __be32 laddr = inet->rcv_saddr; 190 const __u16 lport = inet->num; 191 const __be32 faddr = inet->daddr; 192 const __be16 fport = inet->dport; 193 struct net *net = sock_net(sk); 194 195 return inet_ehashfn(net, laddr, lport, faddr, fport); 196 } 197 198 static inline struct request_sock *inet_reqsk_alloc(struct request_sock_ops *ops) 199 { 200 struct request_sock *req = reqsk_alloc(ops); 201 202 if (req != NULL) 203 inet_rsk(req)->opt = NULL; 204 205 return req; 206 } 207 208 static inline __u8 inet_sk_flowi_flags(const struct sock *sk) 209 { 210 return inet_sk(sk)->transparent ? FLOWI_FLAG_ANYSRC : 0; 211 } 212 213 #endif /* _INET_SOCK_H */ 214