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 struct sk_buff *pktopts; 101 }; 102 }; 103 104 static inline struct inet_request_sock *inet_rsk(const struct request_sock *sk) 105 { 106 return (struct inet_request_sock *)sk; 107 } 108 109 static inline u32 inet_request_mark(const struct sock *sk, struct sk_buff *skb) 110 { 111 if (!sk->sk_mark && sock_net(sk)->ipv4.sysctl_tcp_fwmark_accept) 112 return skb->mark; 113 114 return sk->sk_mark; 115 } 116 117 static inline int inet_request_bound_dev_if(const struct sock *sk, 118 struct sk_buff *skb) 119 { 120 #ifdef CONFIG_NET_L3_MASTER_DEV 121 struct net *net = sock_net(sk); 122 123 if (!sk->sk_bound_dev_if && net->ipv4.sysctl_tcp_l3mdev_accept) 124 return l3mdev_master_ifindex_by_index(net, skb->skb_iif); 125 #endif 126 127 return sk->sk_bound_dev_if; 128 } 129 130 struct inet_cork { 131 unsigned int flags; 132 __be32 addr; 133 struct ip_options *opt; 134 unsigned int fragsize; 135 int length; /* Total length of all frames */ 136 struct dst_entry *dst; 137 u8 tx_flags; 138 __u8 ttl; 139 __s16 tos; 140 char priority; 141 }; 142 143 struct inet_cork_full { 144 struct inet_cork base; 145 struct flowi fl; 146 }; 147 148 struct ip_mc_socklist; 149 struct ipv6_pinfo; 150 struct rtable; 151 152 /** struct inet_sock - representation of INET sockets 153 * 154 * @sk - ancestor class 155 * @pinet6 - pointer to IPv6 control block 156 * @inet_daddr - Foreign IPv4 addr 157 * @inet_rcv_saddr - Bound local IPv4 addr 158 * @inet_dport - Destination port 159 * @inet_num - Local port 160 * @inet_saddr - Sending source 161 * @uc_ttl - Unicast TTL 162 * @inet_sport - Source port 163 * @inet_id - ID counter for DF pkts 164 * @tos - TOS 165 * @mc_ttl - Multicasting TTL 166 * @is_icsk - is this an inet_connection_sock? 167 * @uc_index - Unicast outgoing device index 168 * @mc_index - Multicast device index 169 * @mc_list - Group array 170 * @cork - info to build ip hdr on each ip frag while socket is corked 171 */ 172 struct inet_sock { 173 /* sk and pinet6 has to be the first two members of inet_sock */ 174 struct sock sk; 175 #if IS_ENABLED(CONFIG_IPV6) 176 struct ipv6_pinfo *pinet6; 177 #endif 178 /* Socket demultiplex comparisons on incoming packets. */ 179 #define inet_daddr sk.__sk_common.skc_daddr 180 #define inet_rcv_saddr sk.__sk_common.skc_rcv_saddr 181 #define inet_dport sk.__sk_common.skc_dport 182 #define inet_num sk.__sk_common.skc_num 183 184 __be32 inet_saddr; 185 __s16 uc_ttl; 186 __u16 cmsg_flags; 187 __be16 inet_sport; 188 __u16 inet_id; 189 190 struct ip_options_rcu __rcu *inet_opt; 191 int rx_dst_ifindex; 192 __u8 tos; 193 __u8 min_ttl; 194 __u8 mc_ttl; 195 __u8 pmtudisc; 196 __u8 recverr:1, 197 is_icsk:1, 198 freebind:1, 199 hdrincl:1, 200 mc_loop:1, 201 transparent:1, 202 mc_all:1, 203 nodefrag:1; 204 __u8 bind_address_no_port:1; 205 __u8 rcv_tos; 206 __u8 convert_csum; 207 int uc_index; 208 int mc_index; 209 __be32 mc_addr; 210 struct ip_mc_socklist __rcu *mc_list; 211 struct inet_cork_full cork; 212 }; 213 214 #define IPCORK_OPT 1 /* ip-options has been held in ipcork.opt */ 215 #define IPCORK_ALLFRAG 2 /* always fragment (for ipv6 for now) */ 216 217 /* cmsg flags for inet */ 218 #define IP_CMSG_PKTINFO BIT(0) 219 #define IP_CMSG_TTL BIT(1) 220 #define IP_CMSG_TOS BIT(2) 221 #define IP_CMSG_RECVOPTS BIT(3) 222 #define IP_CMSG_RETOPTS BIT(4) 223 #define IP_CMSG_PASSSEC BIT(5) 224 #define IP_CMSG_ORIGDSTADDR BIT(6) 225 #define IP_CMSG_CHECKSUM BIT(7) 226 227 /** 228 * sk_to_full_sk - Access to a full socket 229 * @sk: pointer to a socket 230 * 231 * SYNACK messages might be attached to request sockets. 232 * Some places want to reach the listener in this case. 233 */ 234 static inline struct sock *sk_to_full_sk(struct sock *sk) 235 { 236 #ifdef CONFIG_INET 237 if (sk && sk->sk_state == TCP_NEW_SYN_RECV) 238 sk = inet_reqsk(sk)->rsk_listener; 239 #endif 240 return sk; 241 } 242 243 /* sk_to_full_sk() variant with a const argument */ 244 static inline const struct sock *sk_const_to_full_sk(const struct sock *sk) 245 { 246 #ifdef CONFIG_INET 247 if (sk && sk->sk_state == TCP_NEW_SYN_RECV) 248 sk = ((const struct request_sock *)sk)->rsk_listener; 249 #endif 250 return sk; 251 } 252 253 static inline struct sock *skb_to_full_sk(const struct sk_buff *skb) 254 { 255 return sk_to_full_sk(skb->sk); 256 } 257 258 static inline struct inet_sock *inet_sk(const struct sock *sk) 259 { 260 return (struct inet_sock *)sk; 261 } 262 263 static inline void __inet_sk_copy_descendant(struct sock *sk_to, 264 const struct sock *sk_from, 265 const int ancestor_size) 266 { 267 memcpy(inet_sk(sk_to) + 1, inet_sk(sk_from) + 1, 268 sk_from->sk_prot->obj_size - ancestor_size); 269 } 270 #if !(IS_ENABLED(CONFIG_IPV6)) 271 static inline void inet_sk_copy_descendant(struct sock *sk_to, 272 const struct sock *sk_from) 273 { 274 __inet_sk_copy_descendant(sk_to, sk_from, sizeof(struct inet_sock)); 275 } 276 #endif 277 278 int inet_sk_rebuild_header(struct sock *sk); 279 280 static inline unsigned int __inet_ehashfn(const __be32 laddr, 281 const __u16 lport, 282 const __be32 faddr, 283 const __be16 fport, 284 u32 initval) 285 { 286 return jhash_3words((__force __u32) laddr, 287 (__force __u32) faddr, 288 ((__u32) lport) << 16 | (__force __u32)fport, 289 initval); 290 } 291 292 struct request_sock *inet_reqsk_alloc(const struct request_sock_ops *ops, 293 struct sock *sk_listener, 294 bool attach_listener); 295 296 static inline __u8 inet_sk_flowi_flags(const struct sock *sk) 297 { 298 __u8 flags = 0; 299 300 if (inet_sk(sk)->transparent || inet_sk(sk)->hdrincl) 301 flags |= FLOWI_FLAG_ANYSRC; 302 return flags; 303 } 304 305 static inline void inet_inc_convert_csum(struct sock *sk) 306 { 307 inet_sk(sk)->convert_csum++; 308 } 309 310 static inline void inet_dec_convert_csum(struct sock *sk) 311 { 312 if (inet_sk(sk)->convert_csum > 0) 313 inet_sk(sk)->convert_csum--; 314 } 315 316 static inline bool inet_get_convert_csum(struct sock *sk) 317 { 318 return !!inet_sk(sk)->convert_csum; 319 } 320 321 #endif /* _INET_SOCK_H */ 322