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_data - Options in __data, rather than skb 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 */ 43 struct 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 62 struct ip_options_rcu { 63 struct rcu_head rcu; 64 struct ip_options opt; 65 }; 66 67 struct ip_options_data { 68 struct ip_options_rcu opt; 69 char data[40]; 70 }; 71 72 struct inet_request_sock { 73 struct request_sock req; 74 #if IS_ENABLED(CONFIG_IPV6) 75 u16 inet6_rsk_offset; 76 #endif 77 __be16 loc_port; 78 __be32 loc_addr; 79 __be32 rmt_addr; 80 __be16 rmt_port; 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 }; 93 94 static inline struct inet_request_sock *inet_rsk(const struct request_sock *sk) 95 { 96 return (struct inet_request_sock *)sk; 97 } 98 99 struct inet_cork { 100 unsigned int flags; 101 __be32 addr; 102 struct ip_options *opt; 103 unsigned int fragsize; 104 struct dst_entry *dst; 105 int length; /* Total length of all frames */ 106 struct page *page; 107 u32 off; 108 u8 tx_flags; 109 }; 110 111 struct inet_cork_full { 112 struct inet_cork base; 113 struct flowi fl; 114 }; 115 116 struct ip_mc_socklist; 117 struct ipv6_pinfo; 118 struct rtable; 119 120 /** struct inet_sock - representation of INET sockets 121 * 122 * @sk - ancestor class 123 * @pinet6 - pointer to IPv6 control block 124 * @inet_daddr - Foreign IPv4 addr 125 * @inet_rcv_saddr - Bound local IPv4 addr 126 * @inet_dport - Destination port 127 * @inet_num - Local port 128 * @inet_saddr - Sending source 129 * @uc_ttl - Unicast TTL 130 * @inet_sport - Source port 131 * @inet_id - ID counter for DF pkts 132 * @tos - TOS 133 * @mc_ttl - Multicasting TTL 134 * @is_icsk - is this an inet_connection_sock? 135 * @mc_index - Multicast device index 136 * @mc_list - Group array 137 * @cork - info to build ip hdr on each ip frag while socket is corked 138 */ 139 struct inet_sock { 140 /* sk and pinet6 has to be the first two members of inet_sock */ 141 struct sock sk; 142 #if IS_ENABLED(CONFIG_IPV6) 143 struct ipv6_pinfo *pinet6; 144 #endif 145 /* Socket demultiplex comparisons on incoming packets. */ 146 #define inet_daddr sk.__sk_common.skc_daddr 147 #define inet_rcv_saddr sk.__sk_common.skc_rcv_saddr 148 149 __be16 inet_dport; 150 __u16 inet_num; 151 __be32 inet_saddr; 152 __s16 uc_ttl; 153 __u16 cmsg_flags; 154 __be16 inet_sport; 155 __u16 inet_id; 156 157 struct ip_options_rcu __rcu *inet_opt; 158 __u8 tos; 159 __u8 min_ttl; 160 __u8 mc_ttl; 161 __u8 pmtudisc; 162 __u8 recverr:1, 163 is_icsk:1, 164 freebind:1, 165 hdrincl:1, 166 mc_loop:1, 167 transparent:1, 168 mc_all:1, 169 nodefrag:1; 170 int mc_index; 171 __be32 mc_addr; 172 struct ip_mc_socklist __rcu *mc_list; 173 struct inet_cork_full cork; 174 }; 175 176 #define IPCORK_OPT 1 /* ip-options has been held in ipcork.opt */ 177 #define IPCORK_ALLFRAG 2 /* always fragment (for ipv6 for now) */ 178 179 static inline struct inet_sock *inet_sk(const struct sock *sk) 180 { 181 return (struct inet_sock *)sk; 182 } 183 184 static inline void __inet_sk_copy_descendant(struct sock *sk_to, 185 const struct sock *sk_from, 186 const int ancestor_size) 187 { 188 memcpy(inet_sk(sk_to) + 1, inet_sk(sk_from) + 1, 189 sk_from->sk_prot->obj_size - ancestor_size); 190 } 191 #if !(IS_ENABLED(CONFIG_IPV6)) 192 static inline void inet_sk_copy_descendant(struct sock *sk_to, 193 const struct sock *sk_from) 194 { 195 __inet_sk_copy_descendant(sk_to, sk_from, sizeof(struct inet_sock)); 196 } 197 #endif 198 199 extern int inet_sk_rebuild_header(struct sock *sk); 200 201 extern u32 inet_ehash_secret; 202 extern void build_ehash_secret(void); 203 204 static inline unsigned int inet_ehashfn(struct net *net, 205 const __be32 laddr, const __u16 lport, 206 const __be32 faddr, const __be16 fport) 207 { 208 return jhash_3words((__force __u32) laddr, 209 (__force __u32) faddr, 210 ((__u32) lport) << 16 | (__force __u32)fport, 211 inet_ehash_secret + net_hash_mix(net)); 212 } 213 214 static inline int inet_sk_ehashfn(const struct sock *sk) 215 { 216 const struct inet_sock *inet = inet_sk(sk); 217 const __be32 laddr = inet->inet_rcv_saddr; 218 const __u16 lport = inet->inet_num; 219 const __be32 faddr = inet->inet_daddr; 220 const __be16 fport = inet->inet_dport; 221 struct net *net = sock_net(sk); 222 223 return inet_ehashfn(net, laddr, lport, faddr, fport); 224 } 225 226 static inline struct request_sock *inet_reqsk_alloc(struct request_sock_ops *ops) 227 { 228 struct request_sock *req = reqsk_alloc(ops); 229 struct inet_request_sock *ireq = inet_rsk(req); 230 231 if (req != NULL) { 232 kmemcheck_annotate_bitfield(ireq, flags); 233 ireq->opt = NULL; 234 } 235 236 return req; 237 } 238 239 static inline __u8 inet_sk_flowi_flags(const struct sock *sk) 240 { 241 __u8 flags = 0; 242 243 if (inet_sk(sk)->transparent || inet_sk(sk)->hdrincl) 244 flags |= FLOWI_FLAG_ANYSRC; 245 if (sk->sk_protocol == IPPROTO_TCP) 246 flags |= FLOWI_FLAG_PRECOW_METRICS; 247 return flags; 248 } 249 250 #endif /* _INET_SOCK_H */ 251