| /* |
| * INET An implementation of the TCP/IP protocol suite for the LINUX |
| * operating system. INET is implemented using the BSD Socket |
| * interface as the means of communication with the user level. |
| * |
| * Definitions for inet_sock |
| * |
| * Authors: Many, reorganised here by |
| * Arnaldo Carvalho de Melo <acme@mandriva.com> |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License |
| * as published by the Free Software Foundation; either version |
| * 2 of the License, or (at your option) any later version. |
| */ |
| #ifndef _INET_SOCK_H |
| #define _INET_SOCK_H |
| |
| #include <linux/bitops.h> |
| #include <linux/string.h> |
| #include <linux/types.h> |
| #include <linux/jhash.h> |
| #include <linux/netdevice.h> |
| |
| #include <net/flow.h> |
| #include <net/sock.h> |
| #include <net/request_sock.h> |
| #include <net/netns/hash.h> |
| #include <net/tcp_states.h> |
| #include <net/l3mdev.h> |
| |
| /** struct ip_options - IP Options |
| * |
| * @faddr - Saved first hop address |
| * @nexthop - Saved nexthop address in LSRR and SSRR |
| * @is_strictroute - Strict source route |
| * @srr_is_hit - Packet destination addr was our one |
| * @is_changed - IP checksum more not valid |
| * @rr_needaddr - Need to record addr of outgoing dev |
| * @ts_needtime - Need to record timestamp |
| * @ts_needaddr - Need to record addr of outgoing dev |
| */ |
| struct ip_options { |
| __be32 faddr; |
| __be32 nexthop; |
| unsigned char optlen; |
| unsigned char srr; |
| unsigned char rr; |
| unsigned char ts; |
| unsigned char is_strictroute:1, |
| srr_is_hit:1, |
| is_changed:1, |
| rr_needaddr:1, |
| ts_needtime:1, |
| ts_needaddr:1; |
| unsigned char router_alert; |
| unsigned char cipso; |
| unsigned char __pad2; |
| unsigned char __data[0]; |
| }; |
| |
| struct ip_options_rcu { |
| struct rcu_head rcu; |
| struct ip_options opt; |
| }; |
| |
| struct ip_options_data { |
| struct ip_options_rcu opt; |
| char data[40]; |
| }; |
| |
| struct inet_request_sock { |
| struct request_sock req; |
| #define ir_loc_addr req.__req_common.skc_rcv_saddr |
| #define ir_rmt_addr req.__req_common.skc_daddr |
| #define ir_num req.__req_common.skc_num |
| #define ir_rmt_port req.__req_common.skc_dport |
| #define ir_v6_rmt_addr req.__req_common.skc_v6_daddr |
| #define ir_v6_loc_addr req.__req_common.skc_v6_rcv_saddr |
| #define ir_iif req.__req_common.skc_bound_dev_if |
| #define ir_cookie req.__req_common.skc_cookie |
| #define ireq_net req.__req_common.skc_net |
| #define ireq_state req.__req_common.skc_state |
| #define ireq_family req.__req_common.skc_family |
| |
| u16 snd_wscale : 4, |
| rcv_wscale : 4, |
| tstamp_ok : 1, |
| sack_ok : 1, |
| wscale_ok : 1, |
| ecn_ok : 1, |
| acked : 1, |
| no_srccheck: 1; |
| u32 ir_mark; |
| union { |
| struct ip_options_rcu __rcu *ireq_opt; |
| #if IS_ENABLED(CONFIG_IPV6) |
| struct { |
| struct ipv6_txoptions *ipv6_opt; |
| struct sk_buff *pktopts; |
| }; |
| #endif |
| }; |
| }; |
| |
| static inline struct inet_request_sock *inet_rsk(const struct request_sock *sk) |
| { |
| return (struct inet_request_sock *)sk; |
| } |
| |
| static inline u32 inet_request_mark(const struct sock *sk, struct sk_buff *skb) |
| { |
| if (!sk->sk_mark && sock_net(sk)->ipv4.sysctl_tcp_fwmark_accept) |
| return skb->mark; |
| |
| return sk->sk_mark; |
| } |
| |
| static inline int inet_request_bound_dev_if(const struct sock *sk, |
| struct sk_buff *skb) |
| { |
| #ifdef CONFIG_NET_L3_MASTER_DEV |
| struct net *net = sock_net(sk); |
| |
| if (!sk->sk_bound_dev_if && net->ipv4.sysctl_tcp_l3mdev_accept) |
| return l3mdev_master_ifindex_by_index(net, skb->skb_iif); |
| #endif |
| |
| return sk->sk_bound_dev_if; |
| } |
| |
| struct inet_cork { |
| unsigned int flags; |
| __be32 addr; |
| struct ip_options *opt; |
| unsigned int fragsize; |
| int length; /* Total length of all frames */ |
| struct dst_entry *dst; |
| u8 tx_flags; |
| __u8 ttl; |
| __s16 tos; |
| char priority; |
| }; |
| |
| struct inet_cork_full { |
| struct inet_cork base; |
| struct flowi fl; |
| }; |
| |
| struct ip_mc_socklist; |
| struct ipv6_pinfo; |
| struct rtable; |
| |
| /** struct inet_sock - representation of INET sockets |
| * |
| * @sk - ancestor class |
| * @pinet6 - pointer to IPv6 control block |
| * @inet_daddr - Foreign IPv4 addr |
| * @inet_rcv_saddr - Bound local IPv4 addr |
| * @inet_dport - Destination port |
| * @inet_num - Local port |
| * @inet_saddr - Sending source |
| * @uc_ttl - Unicast TTL |
| * @inet_sport - Source port |
| * @inet_id - ID counter for DF pkts |
| * @tos - TOS |
| * @mc_ttl - Multicasting TTL |
| * @is_icsk - is this an inet_connection_sock? |
| * @uc_index - Unicast outgoing device index |
| * @mc_index - Multicast device index |
| * @mc_list - Group array |
| * @cork - info to build ip hdr on each ip frag while socket is corked |
| */ |
| struct inet_sock { |
| /* sk and pinet6 has to be the first two members of inet_sock */ |
| struct sock sk; |
| #if IS_ENABLED(CONFIG_IPV6) |
| struct ipv6_pinfo *pinet6; |
| #endif |
| /* Socket demultiplex comparisons on incoming packets. */ |
| #define inet_daddr sk.__sk_common.skc_daddr |
| #define inet_rcv_saddr sk.__sk_common.skc_rcv_saddr |
| #define inet_dport sk.__sk_common.skc_dport |
| #define inet_num sk.__sk_common.skc_num |
| |
| __be32 inet_saddr; |
| __s16 uc_ttl; |
| __u16 cmsg_flags; |
| __be16 inet_sport; |
| __u16 inet_id; |
| |
| struct ip_options_rcu __rcu *inet_opt; |
| int rx_dst_ifindex; |
| __u8 tos; |
| __u8 min_ttl; |
| __u8 mc_ttl; |
| __u8 pmtudisc; |
| __u8 recverr:1, |
| is_icsk:1, |
| freebind:1, |
| hdrincl:1, |
| mc_loop:1, |
| transparent:1, |
| mc_all:1, |
| nodefrag:1; |
| __u8 bind_address_no_port:1, |
| defer_connect:1; /* Indicates that fastopen_connect is set |
| * and cookie exists so we defer connect |
| * until first data frame is written |
| */ |
| __u8 rcv_tos; |
| __u8 convert_csum; |
| int uc_index; |
| int mc_index; |
| __be32 mc_addr; |
| struct ip_mc_socklist __rcu *mc_list; |
| struct inet_cork_full cork; |
| }; |
| |
| #define IPCORK_OPT 1 /* ip-options has been held in ipcork.opt */ |
| #define IPCORK_ALLFRAG 2 /* always fragment (for ipv6 for now) */ |
| |
| /* cmsg flags for inet */ |
| #define IP_CMSG_PKTINFO BIT(0) |
| #define IP_CMSG_TTL BIT(1) |
| #define IP_CMSG_TOS BIT(2) |
| #define IP_CMSG_RECVOPTS BIT(3) |
| #define IP_CMSG_RETOPTS BIT(4) |
| #define IP_CMSG_PASSSEC BIT(5) |
| #define IP_CMSG_ORIGDSTADDR BIT(6) |
| #define IP_CMSG_CHECKSUM BIT(7) |
| #define IP_CMSG_RECVFRAGSIZE BIT(8) |
| |
| /** |
| * sk_to_full_sk - Access to a full socket |
| * @sk: pointer to a socket |
| * |
| * SYNACK messages might be attached to request sockets. |
| * Some places want to reach the listener in this case. |
| */ |
| static inline struct sock *sk_to_full_sk(struct sock *sk) |
| { |
| #ifdef CONFIG_INET |
| if (sk && sk->sk_state == TCP_NEW_SYN_RECV) |
| sk = inet_reqsk(sk)->rsk_listener; |
| #endif |
| return sk; |
| } |
| |
| /* sk_to_full_sk() variant with a const argument */ |
| static inline const struct sock *sk_const_to_full_sk(const struct sock *sk) |
| { |
| #ifdef CONFIG_INET |
| if (sk && sk->sk_state == TCP_NEW_SYN_RECV) |
| sk = ((const struct request_sock *)sk)->rsk_listener; |
| #endif |
| return sk; |
| } |
| |
| static inline struct sock *skb_to_full_sk(const struct sk_buff *skb) |
| { |
| return sk_to_full_sk(skb->sk); |
| } |
| |
| static inline struct inet_sock *inet_sk(const struct sock *sk) |
| { |
| return (struct inet_sock *)sk; |
| } |
| |
| static inline void __inet_sk_copy_descendant(struct sock *sk_to, |
| const struct sock *sk_from, |
| const int ancestor_size) |
| { |
| memcpy(inet_sk(sk_to) + 1, inet_sk(sk_from) + 1, |
| sk_from->sk_prot->obj_size - ancestor_size); |
| } |
| #if !(IS_ENABLED(CONFIG_IPV6)) |
| static inline void inet_sk_copy_descendant(struct sock *sk_to, |
| const struct sock *sk_from) |
| { |
| __inet_sk_copy_descendant(sk_to, sk_from, sizeof(struct inet_sock)); |
| } |
| #endif |
| |
| int inet_sk_rebuild_header(struct sock *sk); |
| |
| static inline unsigned int __inet_ehashfn(const __be32 laddr, |
| const __u16 lport, |
| const __be32 faddr, |
| const __be16 fport, |
| u32 initval) |
| { |
| return jhash_3words((__force __u32) laddr, |
| (__force __u32) faddr, |
| ((__u32) lport) << 16 | (__force __u32)fport, |
| initval); |
| } |
| |
| struct request_sock *inet_reqsk_alloc(const struct request_sock_ops *ops, |
| struct sock *sk_listener, |
| bool attach_listener); |
| |
| static inline __u8 inet_sk_flowi_flags(const struct sock *sk) |
| { |
| __u8 flags = 0; |
| |
| if (inet_sk(sk)->transparent || inet_sk(sk)->hdrincl) |
| flags |= FLOWI_FLAG_ANYSRC; |
| return flags; |
| } |
| |
| static inline void inet_inc_convert_csum(struct sock *sk) |
| { |
| inet_sk(sk)->convert_csum++; |
| } |
| |
| static inline void inet_dec_convert_csum(struct sock *sk) |
| { |
| if (inet_sk(sk)->convert_csum > 0) |
| inet_sk(sk)->convert_csum--; |
| } |
| |
| static inline bool inet_get_convert_csum(struct sock *sk) |
| { |
| return !!inet_sk(sk)->convert_csum; |
| } |
| |
| #endif /* _INET_SOCK_H */ |