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Diffstat (limited to '')
| -rw-r--r-- | include/net/inet_sock.h | 389 |
1 files changed, 389 insertions, 0 deletions
diff --git a/include/net/inet_sock.h b/include/net/inet_sock.h new file mode 100644 index 000000000..f0faf9d0e --- /dev/null +++ b/include/net/inet_sock.h @@ -0,0 +1,389 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * 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> + */ +#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[]; +}; + +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, + smc_ok : 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 && + READ_ONCE(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) +{ + int bound_dev_if = READ_ONCE(sk->sk_bound_dev_if); +#ifdef CONFIG_NET_L3_MASTER_DEV + struct net *net = sock_net(sk); + + if (!bound_dev_if && READ_ONCE(net->ipv4.sysctl_tcp_l3mdev_accept)) + return l3mdev_master_ifindex_by_index(net, skb->skb_iif); +#endif + + return bound_dev_if; +} + +static inline int inet_sk_bound_l3mdev(const struct sock *sk) +{ +#ifdef CONFIG_NET_L3_MASTER_DEV + struct net *net = sock_net(sk); + + if (!READ_ONCE(net->ipv4.sysctl_tcp_l3mdev_accept)) + return l3mdev_master_ifindex_by_index(net, + sk->sk_bound_dev_if); +#endif + + return 0; +} + +static inline bool inet_bound_dev_eq(bool l3mdev_accept, int bound_dev_if, + int dif, int sdif) +{ + if (!bound_dev_if) + return !sdif || l3mdev_accept; + return bound_dev_if == dif || bound_dev_if == sdif; +} + +static inline bool inet_sk_bound_dev_eq(struct net *net, int bound_dev_if, + int dif, int sdif) +{ +#if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV) + return inet_bound_dev_eq(!!READ_ONCE(net->ipv4.sysctl_tcp_l3mdev_accept), + bound_dev_if, dif, sdif); +#else + return inet_bound_dev_eq(true, bound_dev_if, dif, sdif); +#endif +} + +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; + __u16 gso_size; + u64 transmit_time; + u32 mark; +}; + +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, + recverr_rfc4884:1, + 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); +} + +int inet_sk_rebuild_header(struct sock *sk); + +/** + * inet_sk_state_load - read sk->sk_state for lockless contexts + * @sk: socket pointer + * + * Paired with inet_sk_state_store(). Used in places we don't hold socket lock: + * tcp_diag_get_info(), tcp_get_info(), tcp_poll(), get_tcp4_sock() ... + */ +static inline int inet_sk_state_load(const struct sock *sk) +{ + /* state change might impact lockless readers. */ + return smp_load_acquire(&sk->sk_state); +} + +/** + * inet_sk_state_store - update sk->sk_state + * @sk: socket pointer + * @newstate: new state + * + * Paired with inet_sk_state_load(). Should be used in contexts where + * state change might impact lockless readers. + */ +void inet_sk_state_store(struct sock *sk, int newstate); + +void inet_sk_set_state(struct sock *sk, int state); + +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; +} + + +static inline bool inet_can_nonlocal_bind(struct net *net, + struct inet_sock *inet) +{ + return READ_ONCE(net->ipv4.sysctl_ip_nonlocal_bind) || + inet->freebind || inet->transparent; +} + +#endif /* _INET_SOCK_H */ |