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 * @is_data - Options in __data, rather than skb 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 unsigned char optlen; 45 unsigned char srr; 46 unsigned char rr; 47 unsigned char ts; 48 unsigned char is_strictroute:1, 49 srr_is_hit:1, 50 is_changed:1, 51 rr_needaddr:1, 52 ts_needtime:1, 53 ts_needaddr:1; 54 unsigned char router_alert; 55 unsigned char cipso; 56 unsigned char __pad2; 57 unsigned char __data[0]; 58 }; 59 60 #define optlength(opt) (sizeof(struct ip_options) + opt->optlen) 61 62 struct inet_request_sock { 63 struct request_sock req; 64 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 65 u16 inet6_rsk_offset; 66 #endif 67 __be16 loc_port; 68 __be32 loc_addr; 69 __be32 rmt_addr; 70 __be16 rmt_port; 71 kmemcheck_bitfield_begin(flags); 72 u16 snd_wscale : 4, 73 rcv_wscale : 4, 74 tstamp_ok : 1, 75 sack_ok : 1, 76 wscale_ok : 1, 77 ecn_ok : 1, 78 acked : 1, 79 no_srccheck: 1; 80 kmemcheck_bitfield_end(flags); 81 struct ip_options *opt; 82 }; 83 84 static inline struct inet_request_sock *inet_rsk(const struct request_sock *sk) 85 { 86 return (struct inet_request_sock *)sk; 87 } 88 89 struct ip_mc_socklist; 90 struct ipv6_pinfo; 91 struct rtable; 92 93 /** struct inet_sock - representation of INET sockets 94 * 95 * @sk - ancestor class 96 * @pinet6 - pointer to IPv6 control block 97 * @inet_daddr - Foreign IPv4 addr 98 * @inet_rcv_saddr - Bound local IPv4 addr 99 * @inet_dport - Destination port 100 * @inet_num - Local port 101 * @inet_saddr - Sending source 102 * @uc_ttl - Unicast TTL 103 * @inet_sport - Source port 104 * @inet_id - ID counter for DF pkts 105 * @tos - TOS 106 * @mc_ttl - Multicasting TTL 107 * @is_icsk - is this an inet_connection_sock? 108 * @mc_index - Multicast device index 109 * @mc_list - Group array 110 * @cork - info to build ip hdr on each ip frag while socket is corked 111 */ 112 struct inet_sock { 113 /* sk and pinet6 has to be the first two members of inet_sock */ 114 struct sock sk; 115 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 116 struct ipv6_pinfo *pinet6; 117 #endif 118 /* Socket demultiplex comparisons on incoming packets. */ 119 __be32 inet_daddr; 120 __be32 inet_rcv_saddr; 121 __be16 inet_dport; 122 __u16 inet_num; 123 __be32 inet_saddr; 124 __s16 uc_ttl; 125 __u16 cmsg_flags; 126 __be16 inet_sport; 127 __u16 inet_id; 128 129 struct ip_options *opt; 130 __u8 tos; 131 __u8 min_ttl; 132 __u8 mc_ttl; 133 __u8 pmtudisc; 134 __u8 recverr:1, 135 is_icsk:1, 136 freebind:1, 137 hdrincl:1, 138 mc_loop:1, 139 transparent:1, 140 mc_all:1, 141 nodefrag:1; 142 int mc_index; 143 __be32 mc_addr; 144 struct ip_mc_socklist *mc_list; 145 struct { 146 unsigned int flags; 147 unsigned int fragsize; 148 struct ip_options *opt; 149 struct dst_entry *dst; 150 int length; /* Total length of all frames */ 151 __be32 addr; 152 struct flowi fl; 153 } cork; 154 }; 155 156 #define IPCORK_OPT 1 /* ip-options has been held in ipcork.opt */ 157 #define IPCORK_ALLFRAG 2 /* always fragment (for ipv6 for now) */ 158 159 static inline struct inet_sock *inet_sk(const struct sock *sk) 160 { 161 return (struct inet_sock *)sk; 162 } 163 164 static inline void __inet_sk_copy_descendant(struct sock *sk_to, 165 const struct sock *sk_from, 166 const int ancestor_size) 167 { 168 memcpy(inet_sk(sk_to) + 1, inet_sk(sk_from) + 1, 169 sk_from->sk_prot->obj_size - ancestor_size); 170 } 171 #if !(defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)) 172 static inline void inet_sk_copy_descendant(struct sock *sk_to, 173 const struct sock *sk_from) 174 { 175 __inet_sk_copy_descendant(sk_to, sk_from, sizeof(struct inet_sock)); 176 } 177 #endif 178 179 extern int inet_sk_rebuild_header(struct sock *sk); 180 181 extern u32 inet_ehash_secret; 182 extern void build_ehash_secret(void); 183 184 static inline unsigned int inet_ehashfn(struct net *net, 185 const __be32 laddr, const __u16 lport, 186 const __be32 faddr, const __be16 fport) 187 { 188 return jhash_3words((__force __u32) laddr, 189 (__force __u32) faddr, 190 ((__u32) lport) << 16 | (__force __u32)fport, 191 inet_ehash_secret + net_hash_mix(net)); 192 } 193 194 static inline int inet_sk_ehashfn(const struct sock *sk) 195 { 196 const struct inet_sock *inet = inet_sk(sk); 197 const __be32 laddr = inet->inet_rcv_saddr; 198 const __u16 lport = inet->inet_num; 199 const __be32 faddr = inet->inet_daddr; 200 const __be16 fport = inet->inet_dport; 201 struct net *net = sock_net(sk); 202 203 return inet_ehashfn(net, laddr, lport, faddr, fport); 204 } 205 206 static inline struct request_sock *inet_reqsk_alloc(struct request_sock_ops *ops) 207 { 208 struct request_sock *req = reqsk_alloc(ops); 209 struct inet_request_sock *ireq = inet_rsk(req); 210 211 if (req != NULL) { 212 kmemcheck_annotate_bitfield(ireq, flags); 213 ireq->opt = NULL; 214 } 215 216 return req; 217 } 218 219 static inline __u8 inet_sk_flowi_flags(const struct sock *sk) 220 { 221 return inet_sk(sk)->transparent ? FLOWI_FLAG_ANYSRC : 0; 222 } 223 224 #endif /* _INET_SOCK_H */ 225