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 struct ip_options_rcu { 61 struct rcu_head rcu; 62 struct ip_options opt; 63 }; 64 65 struct ip_options_data { 66 struct ip_options_rcu opt; 67 char data[40]; 68 }; 69 70 struct inet_request_sock { 71 struct request_sock req; 72 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 73 u16 inet6_rsk_offset; 74 #endif 75 __be16 loc_port; 76 __be32 loc_addr; 77 __be32 rmt_addr; 78 __be16 rmt_port; 79 kmemcheck_bitfield_begin(flags); 80 u16 snd_wscale : 4, 81 rcv_wscale : 4, 82 tstamp_ok : 1, 83 sack_ok : 1, 84 wscale_ok : 1, 85 ecn_ok : 1, 86 acked : 1, 87 no_srccheck: 1; 88 kmemcheck_bitfield_end(flags); 89 struct ip_options_rcu *opt; 90 }; 91 92 static inline struct inet_request_sock *inet_rsk(const struct request_sock *sk) 93 { 94 return (struct inet_request_sock *)sk; 95 } 96 97 struct inet_cork { 98 unsigned int flags; 99 __be32 addr; 100 struct ip_options *opt; 101 unsigned int fragsize; 102 struct dst_entry *dst; 103 int length; /* Total length of all frames */ 104 struct page *page; 105 u32 off; 106 u8 tx_flags; 107 }; 108 109 struct inet_cork_full { 110 struct inet_cork base; 111 struct flowi fl; 112 }; 113 114 struct ip_mc_socklist; 115 struct ipv6_pinfo; 116 struct rtable; 117 118 /** struct inet_sock - representation of INET sockets 119 * 120 * @sk - ancestor class 121 * @pinet6 - pointer to IPv6 control block 122 * @inet_daddr - Foreign IPv4 addr 123 * @inet_rcv_saddr - Bound local IPv4 addr 124 * @inet_dport - Destination port 125 * @inet_num - Local port 126 * @inet_saddr - Sending source 127 * @uc_ttl - Unicast TTL 128 * @inet_sport - Source port 129 * @inet_id - ID counter for DF pkts 130 * @tos - TOS 131 * @mc_ttl - Multicasting TTL 132 * @is_icsk - is this an inet_connection_sock? 133 * @mc_index - Multicast device index 134 * @mc_list - Group array 135 * @cork - info to build ip hdr on each ip frag while socket is corked 136 */ 137 struct inet_sock { 138 /* sk and pinet6 has to be the first two members of inet_sock */ 139 struct sock sk; 140 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 141 struct ipv6_pinfo *pinet6; 142 #endif 143 /* Socket demultiplex comparisons on incoming packets. */ 144 #define inet_daddr sk.__sk_common.skc_daddr 145 #define inet_rcv_saddr sk.__sk_common.skc_rcv_saddr 146 147 __be16 inet_dport; 148 __u16 inet_num; 149 __be32 inet_saddr; 150 __s16 uc_ttl; 151 __u16 cmsg_flags; 152 __be16 inet_sport; 153 __u16 inet_id; 154 155 struct ip_options_rcu __rcu *inet_opt; 156 __u8 tos; 157 __u8 min_ttl; 158 __u8 mc_ttl; 159 __u8 pmtudisc; 160 __u8 recverr:1, 161 is_icsk:1, 162 freebind:1, 163 hdrincl:1, 164 mc_loop:1, 165 transparent:1, 166 mc_all:1, 167 nodefrag:1; 168 int mc_index; 169 __be32 mc_addr; 170 struct ip_mc_socklist __rcu *mc_list; 171 struct inet_cork_full cork; 172 }; 173 174 #define IPCORK_OPT 1 /* ip-options has been held in ipcork.opt */ 175 #define IPCORK_ALLFRAG 2 /* always fragment (for ipv6 for now) */ 176 177 static inline struct inet_sock *inet_sk(const struct sock *sk) 178 { 179 return (struct inet_sock *)sk; 180 } 181 182 static inline void __inet_sk_copy_descendant(struct sock *sk_to, 183 const struct sock *sk_from, 184 const int ancestor_size) 185 { 186 memcpy(inet_sk(sk_to) + 1, inet_sk(sk_from) + 1, 187 sk_from->sk_prot->obj_size - ancestor_size); 188 } 189 #if !(defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)) 190 static inline void inet_sk_copy_descendant(struct sock *sk_to, 191 const struct sock *sk_from) 192 { 193 __inet_sk_copy_descendant(sk_to, sk_from, sizeof(struct inet_sock)); 194 } 195 #endif 196 197 extern int inet_sk_rebuild_header(struct sock *sk); 198 199 extern u32 inet_ehash_secret; 200 extern void build_ehash_secret(void); 201 202 static inline unsigned int inet_ehashfn(struct net *net, 203 const __be32 laddr, const __u16 lport, 204 const __be32 faddr, const __be16 fport) 205 { 206 return jhash_3words((__force __u32) laddr, 207 (__force __u32) faddr, 208 ((__u32) lport) << 16 | (__force __u32)fport, 209 inet_ehash_secret + net_hash_mix(net)); 210 } 211 212 static inline int inet_sk_ehashfn(const struct sock *sk) 213 { 214 const struct inet_sock *inet = inet_sk(sk); 215 const __be32 laddr = inet->inet_rcv_saddr; 216 const __u16 lport = inet->inet_num; 217 const __be32 faddr = inet->inet_daddr; 218 const __be16 fport = inet->inet_dport; 219 struct net *net = sock_net(sk); 220 221 return inet_ehashfn(net, laddr, lport, faddr, fport); 222 } 223 224 static inline struct request_sock *inet_reqsk_alloc(struct request_sock_ops *ops) 225 { 226 struct request_sock *req = reqsk_alloc(ops); 227 struct inet_request_sock *ireq = inet_rsk(req); 228 229 if (req != NULL) { 230 kmemcheck_annotate_bitfield(ireq, flags); 231 ireq->opt = NULL; 232 } 233 234 return req; 235 } 236 237 static inline __u8 inet_sk_flowi_flags(const struct sock *sk) 238 { 239 __u8 flags = 0; 240 241 if (inet_sk(sk)->transparent || inet_sk(sk)->hdrincl) 242 flags |= FLOWI_FLAG_ANYSRC; 243 if (sk->sk_protocol == IPPROTO_TCP) 244 flags |= FLOWI_FLAG_PRECOW_METRICS; 245 return flags; 246 } 247 248 #endif /* _INET_SOCK_H */ 249