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 #include <net/l3mdev.h> 32 33 /** struct ip_options - IP Options 34 * 35 * @faddr - Saved first hop address 36 * @nexthop - Saved nexthop address in LSRR and SSRR 37 * @is_strictroute - Strict source route 38 * @srr_is_hit - Packet destination addr was our one 39 * @is_changed - IP checksum more not valid 40 * @rr_needaddr - Need to record addr of outgoing dev 41 * @ts_needtime - Need to record timestamp 42 * @ts_needaddr - Need to record addr of outgoing dev 43 */ 44 struct ip_options { 45 __be32 faddr; 46 __be32 nexthop; 47 unsigned char optlen; 48 unsigned char srr; 49 unsigned char rr; 50 unsigned char ts; 51 unsigned char is_strictroute:1, 52 srr_is_hit:1, 53 is_changed:1, 54 rr_needaddr:1, 55 ts_needtime:1, 56 ts_needaddr:1; 57 unsigned char router_alert; 58 unsigned char cipso; 59 unsigned char __pad2; 60 unsigned char __data[0]; 61 }; 62 63 struct ip_options_rcu { 64 struct rcu_head rcu; 65 struct ip_options opt; 66 }; 67 68 struct ip_options_data { 69 struct ip_options_rcu opt; 70 char data[40]; 71 }; 72 73 struct inet_request_sock { 74 struct request_sock req; 75 #define ir_loc_addr req.__req_common.skc_rcv_saddr 76 #define ir_rmt_addr req.__req_common.skc_daddr 77 #define ir_num req.__req_common.skc_num 78 #define ir_rmt_port req.__req_common.skc_dport 79 #define ir_v6_rmt_addr req.__req_common.skc_v6_daddr 80 #define ir_v6_loc_addr req.__req_common.skc_v6_rcv_saddr 81 #define ir_iif req.__req_common.skc_bound_dev_if 82 #define ir_cookie req.__req_common.skc_cookie 83 #define ireq_net req.__req_common.skc_net 84 #define ireq_state req.__req_common.skc_state 85 #define ireq_family req.__req_common.skc_family 86 87 kmemcheck_bitfield_begin(flags); 88 u16 snd_wscale : 4, 89 rcv_wscale : 4, 90 tstamp_ok : 1, 91 sack_ok : 1, 92 wscale_ok : 1, 93 ecn_ok : 1, 94 acked : 1, 95 no_srccheck: 1; 96 kmemcheck_bitfield_end(flags); 97 u32 ir_mark; 98 union { 99 struct ip_options_rcu *opt; 100 #if IS_ENABLED(CONFIG_IPV6) 101 struct { 102 struct ipv6_txoptions *ipv6_opt; 103 struct sk_buff *pktopts; 104 }; 105 #endif 106 }; 107 }; 108 109 static inline struct inet_request_sock *inet_rsk(const struct request_sock *sk) 110 { 111 return (struct inet_request_sock *)sk; 112 } 113 114 static inline u32 inet_request_mark(const struct sock *sk, struct sk_buff *skb) 115 { 116 if (!sk->sk_mark && sock_net(sk)->ipv4.sysctl_tcp_fwmark_accept) 117 return skb->mark; 118 119 return sk->sk_mark; 120 } 121 122 static inline int inet_request_bound_dev_if(const struct sock *sk, 123 struct sk_buff *skb) 124 { 125 #ifdef CONFIG_NET_L3_MASTER_DEV 126 struct net *net = sock_net(sk); 127 128 if (!sk->sk_bound_dev_if && net->ipv4.sysctl_tcp_l3mdev_accept) 129 return l3mdev_master_ifindex_by_index(net, skb->skb_iif); 130 #endif 131 132 return sk->sk_bound_dev_if; 133 } 134 135 struct inet_cork { 136 unsigned int flags; 137 __be32 addr; 138 struct ip_options *opt; 139 unsigned int fragsize; 140 int length; /* Total length of all frames */ 141 struct dst_entry *dst; 142 u8 tx_flags; 143 __u8 ttl; 144 __s16 tos; 145 char priority; 146 }; 147 148 struct inet_cork_full { 149 struct inet_cork base; 150 struct flowi fl; 151 }; 152 153 struct ip_mc_socklist; 154 struct ipv6_pinfo; 155 struct rtable; 156 157 /** struct inet_sock - representation of INET sockets 158 * 159 * @sk - ancestor class 160 * @pinet6 - pointer to IPv6 control block 161 * @inet_daddr - Foreign IPv4 addr 162 * @inet_rcv_saddr - Bound local IPv4 addr 163 * @inet_dport - Destination port 164 * @inet_num - Local port 165 * @inet_saddr - Sending source 166 * @uc_ttl - Unicast TTL 167 * @inet_sport - Source port 168 * @inet_id - ID counter for DF pkts 169 * @tos - TOS 170 * @mc_ttl - Multicasting TTL 171 * @is_icsk - is this an inet_connection_sock? 172 * @uc_index - Unicast outgoing device index 173 * @mc_index - Multicast device index 174 * @mc_list - Group array 175 * @cork - info to build ip hdr on each ip frag while socket is corked 176 */ 177 struct inet_sock { 178 /* sk and pinet6 has to be the first two members of inet_sock */ 179 struct sock sk; 180 #if IS_ENABLED(CONFIG_IPV6) 181 struct ipv6_pinfo *pinet6; 182 #endif 183 /* Socket demultiplex comparisons on incoming packets. */ 184 #define inet_daddr sk.__sk_common.skc_daddr 185 #define inet_rcv_saddr sk.__sk_common.skc_rcv_saddr 186 #define inet_dport sk.__sk_common.skc_dport 187 #define inet_num sk.__sk_common.skc_num 188 189 __be32 inet_saddr; 190 __s16 uc_ttl; 191 __u16 cmsg_flags; 192 __be16 inet_sport; 193 __u16 inet_id; 194 195 struct ip_options_rcu __rcu *inet_opt; 196 int rx_dst_ifindex; 197 __u8 tos; 198 __u8 min_ttl; 199 __u8 mc_ttl; 200 __u8 pmtudisc; 201 __u8 recverr:1, 202 is_icsk:1, 203 freebind:1, 204 hdrincl:1, 205 mc_loop:1, 206 transparent:1, 207 mc_all:1, 208 nodefrag:1; 209 __u8 bind_address_no_port:1; 210 __u8 rcv_tos; 211 __u8 convert_csum; 212 int uc_index; 213 int mc_index; 214 __be32 mc_addr; 215 struct ip_mc_socklist __rcu *mc_list; 216 struct inet_cork_full cork; 217 }; 218 219 #define IPCORK_OPT 1 /* ip-options has been held in ipcork.opt */ 220 #define IPCORK_ALLFRAG 2 /* always fragment (for ipv6 for now) */ 221 222 /* cmsg flags for inet */ 223 #define IP_CMSG_PKTINFO BIT(0) 224 #define IP_CMSG_TTL BIT(1) 225 #define IP_CMSG_TOS BIT(2) 226 #define IP_CMSG_RECVOPTS BIT(3) 227 #define IP_CMSG_RETOPTS BIT(4) 228 #define IP_CMSG_PASSSEC BIT(5) 229 #define IP_CMSG_ORIGDSTADDR BIT(6) 230 #define IP_CMSG_CHECKSUM BIT(7) 231 232 /** 233 * sk_to_full_sk - Access to a full socket 234 * @sk: pointer to a socket 235 * 236 * SYNACK messages might be attached to request sockets. 237 * Some places want to reach the listener in this case. 238 */ 239 static inline struct sock *sk_to_full_sk(struct sock *sk) 240 { 241 #ifdef CONFIG_INET 242 if (sk && sk->sk_state == TCP_NEW_SYN_RECV) 243 sk = inet_reqsk(sk)->rsk_listener; 244 #endif 245 return sk; 246 } 247 248 /* sk_to_full_sk() variant with a const argument */ 249 static inline const struct sock *sk_const_to_full_sk(const struct sock *sk) 250 { 251 #ifdef CONFIG_INET 252 if (sk && sk->sk_state == TCP_NEW_SYN_RECV) 253 sk = ((const struct request_sock *)sk)->rsk_listener; 254 #endif 255 return sk; 256 } 257 258 static inline struct sock *skb_to_full_sk(const struct sk_buff *skb) 259 { 260 return sk_to_full_sk(skb->sk); 261 } 262 263 static inline struct inet_sock *inet_sk(const struct sock *sk) 264 { 265 return (struct inet_sock *)sk; 266 } 267 268 static inline void __inet_sk_copy_descendant(struct sock *sk_to, 269 const struct sock *sk_from, 270 const int ancestor_size) 271 { 272 memcpy(inet_sk(sk_to) + 1, inet_sk(sk_from) + 1, 273 sk_from->sk_prot->obj_size - ancestor_size); 274 } 275 #if !(IS_ENABLED(CONFIG_IPV6)) 276 static inline void inet_sk_copy_descendant(struct sock *sk_to, 277 const struct sock *sk_from) 278 { 279 __inet_sk_copy_descendant(sk_to, sk_from, sizeof(struct inet_sock)); 280 } 281 #endif 282 283 int inet_sk_rebuild_header(struct sock *sk); 284 285 static inline unsigned int __inet_ehashfn(const __be32 laddr, 286 const __u16 lport, 287 const __be32 faddr, 288 const __be16 fport, 289 u32 initval) 290 { 291 return jhash_3words((__force __u32) laddr, 292 (__force __u32) faddr, 293 ((__u32) lport) << 16 | (__force __u32)fport, 294 initval); 295 } 296 297 struct request_sock *inet_reqsk_alloc(const struct request_sock_ops *ops, 298 struct sock *sk_listener, 299 bool attach_listener); 300 301 static inline __u8 inet_sk_flowi_flags(const struct sock *sk) 302 { 303 __u8 flags = 0; 304 305 if (inet_sk(sk)->transparent || inet_sk(sk)->hdrincl) 306 flags |= FLOWI_FLAG_ANYSRC; 307 return flags; 308 } 309 310 static inline void inet_inc_convert_csum(struct sock *sk) 311 { 312 inet_sk(sk)->convert_csum++; 313 } 314 315 static inline void inet_dec_convert_csum(struct sock *sk) 316 { 317 if (inet_sk(sk)->convert_csum > 0) 318 inet_sk(sk)->convert_csum--; 319 } 320 321 static inline bool inet_get_convert_csum(struct sock *sk) 322 { 323 return !!inet_sk(sk)->convert_csum; 324 } 325 326 #endif /* _INET_SOCK_H */ 327