307 lines
6.9 KiB
C
307 lines
6.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Multipath TCP
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*
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* Copyright (c) 2017 - 2019, Intel Corporation.
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*/
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#ifndef __NET_MPTCP_H
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#define __NET_MPTCP_H
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#include <linux/skbuff.h>
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#include <linux/tcp.h>
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#include <linux/types.h>
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struct mptcp_info;
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struct mptcp_sock;
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struct seq_file;
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/* MPTCP sk_buff extension data */
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struct mptcp_ext {
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union {
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u64 data_ack;
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u32 data_ack32;
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};
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u64 data_seq;
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u32 subflow_seq;
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u16 data_len;
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__sum16 csum;
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u8 use_map:1,
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dsn64:1,
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data_fin:1,
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use_ack:1,
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ack64:1,
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mpc_map:1,
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frozen:1,
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reset_transient:1;
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u8 reset_reason:4,
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csum_reqd:1,
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infinite_map:1;
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};
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#define MPTCPOPT_HMAC_LEN 20
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#define MPTCP_RM_IDS_MAX 8
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struct mptcp_rm_list {
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u8 ids[MPTCP_RM_IDS_MAX];
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u8 nr;
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};
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struct mptcp_addr_info {
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u8 id;
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sa_family_t family;
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__be16 port;
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union {
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struct in_addr addr;
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#if IS_ENABLED(CONFIG_MPTCP_IPV6)
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struct in6_addr addr6;
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#endif
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};
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};
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struct mptcp_out_options {
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#if IS_ENABLED(CONFIG_MPTCP)
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u16 suboptions;
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struct mptcp_rm_list rm_list;
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u8 join_id;
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u8 backup;
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u8 reset_reason:4,
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reset_transient:1,
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csum_reqd:1,
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allow_join_id0:1;
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union {
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struct {
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u64 sndr_key;
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u64 rcvr_key;
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u64 data_seq;
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u32 subflow_seq;
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u16 data_len;
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__sum16 csum;
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};
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struct {
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struct mptcp_addr_info addr;
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u64 ahmac;
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};
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struct {
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struct mptcp_ext ext_copy;
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u64 fail_seq;
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};
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struct {
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u32 nonce;
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u32 token;
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u64 thmac;
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u8 hmac[MPTCPOPT_HMAC_LEN];
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};
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};
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#endif
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};
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#ifdef CONFIG_MPTCP
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void mptcp_init(void);
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static inline bool sk_is_mptcp(const struct sock *sk)
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{
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return tcp_sk(sk)->is_mptcp;
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}
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static inline bool rsk_is_mptcp(const struct request_sock *req)
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{
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return tcp_rsk(req)->is_mptcp;
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}
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static inline bool rsk_drop_req(const struct request_sock *req)
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{
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return tcp_rsk(req)->is_mptcp && tcp_rsk(req)->drop_req;
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}
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void mptcp_space(const struct sock *ssk, int *space, int *full_space);
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bool mptcp_syn_options(struct sock *sk, const struct sk_buff *skb,
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unsigned int *size, struct mptcp_out_options *opts);
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bool mptcp_synack_options(const struct request_sock *req, unsigned int *size,
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struct mptcp_out_options *opts);
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bool mptcp_established_options(struct sock *sk, struct sk_buff *skb,
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unsigned int *size, unsigned int remaining,
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struct mptcp_out_options *opts);
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bool mptcp_incoming_options(struct sock *sk, struct sk_buff *skb);
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void mptcp_write_options(struct tcphdr *th, __be32 *ptr, struct tcp_sock *tp,
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struct mptcp_out_options *opts);
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void mptcp_diag_fill_info(struct mptcp_sock *msk, struct mptcp_info *info);
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/* move the skb extension owership, with the assumption that 'to' is
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* newly allocated
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*/
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static inline void mptcp_skb_ext_move(struct sk_buff *to,
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struct sk_buff *from)
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{
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if (!skb_ext_exist(from, SKB_EXT_MPTCP))
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return;
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if (WARN_ON_ONCE(to->active_extensions))
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skb_ext_put(to);
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to->active_extensions = from->active_extensions;
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to->extensions = from->extensions;
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from->active_extensions = 0;
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}
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static inline void mptcp_skb_ext_copy(struct sk_buff *to,
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struct sk_buff *from)
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{
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struct mptcp_ext *from_ext;
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from_ext = skb_ext_find(from, SKB_EXT_MPTCP);
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if (!from_ext)
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return;
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from_ext->frozen = 1;
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skb_ext_copy(to, from);
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}
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static inline bool mptcp_ext_matches(const struct mptcp_ext *to_ext,
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const struct mptcp_ext *from_ext)
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{
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/* MPTCP always clears the ext when adding it to the skb, so
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* holes do not bother us here
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*/
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return !from_ext ||
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(to_ext && from_ext &&
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!memcmp(from_ext, to_ext, sizeof(struct mptcp_ext)));
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}
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/* check if skbs can be collapsed.
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* MPTCP collapse is allowed if neither @to or @from carry an mptcp data
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* mapping, or if the extension of @to is the same as @from.
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* Collapsing is not possible if @to lacks an extension, but @from carries one.
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*/
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static inline bool mptcp_skb_can_collapse(const struct sk_buff *to,
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const struct sk_buff *from)
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{
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return mptcp_ext_matches(skb_ext_find(to, SKB_EXT_MPTCP),
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skb_ext_find(from, SKB_EXT_MPTCP));
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}
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void mptcp_seq_show(struct seq_file *seq);
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int mptcp_subflow_init_cookie_req(struct request_sock *req,
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const struct sock *sk_listener,
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struct sk_buff *skb);
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struct request_sock *mptcp_subflow_reqsk_alloc(const struct request_sock_ops *ops,
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struct sock *sk_listener,
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bool attach_listener);
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__be32 mptcp_get_reset_option(const struct sk_buff *skb);
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static inline __be32 mptcp_reset_option(const struct sk_buff *skb)
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{
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if (skb_ext_exist(skb, SKB_EXT_MPTCP))
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return mptcp_get_reset_option(skb);
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return htonl(0u);
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}
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#else
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static inline void mptcp_init(void)
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{
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}
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static inline bool sk_is_mptcp(const struct sock *sk)
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{
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return false;
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}
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static inline bool rsk_is_mptcp(const struct request_sock *req)
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{
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return false;
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}
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static inline bool rsk_drop_req(const struct request_sock *req)
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{
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return false;
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}
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static inline bool mptcp_syn_options(struct sock *sk, const struct sk_buff *skb,
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unsigned int *size,
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struct mptcp_out_options *opts)
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{
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return false;
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}
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static inline bool mptcp_synack_options(const struct request_sock *req,
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unsigned int *size,
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struct mptcp_out_options *opts)
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{
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return false;
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}
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static inline bool mptcp_established_options(struct sock *sk,
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struct sk_buff *skb,
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unsigned int *size,
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unsigned int remaining,
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struct mptcp_out_options *opts)
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{
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return false;
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}
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static inline bool mptcp_incoming_options(struct sock *sk,
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struct sk_buff *skb)
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{
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return true;
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}
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static inline void mptcp_skb_ext_move(struct sk_buff *to,
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const struct sk_buff *from)
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{
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}
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static inline void mptcp_skb_ext_copy(struct sk_buff *to,
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struct sk_buff *from)
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{
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}
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static inline bool mptcp_skb_can_collapse(const struct sk_buff *to,
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const struct sk_buff *from)
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{
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return true;
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}
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static inline void mptcp_space(const struct sock *ssk, int *s, int *fs) { }
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static inline void mptcp_seq_show(struct seq_file *seq) { }
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static inline int mptcp_subflow_init_cookie_req(struct request_sock *req,
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const struct sock *sk_listener,
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struct sk_buff *skb)
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{
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return 0; /* TCP fallback */
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}
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static inline struct request_sock *mptcp_subflow_reqsk_alloc(const struct request_sock_ops *ops,
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struct sock *sk_listener,
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bool attach_listener)
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{
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return NULL;
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}
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static inline __be32 mptcp_reset_option(const struct sk_buff *skb) { return htonl(0u); }
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#endif /* CONFIG_MPTCP */
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#if IS_ENABLED(CONFIG_MPTCP_IPV6)
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int mptcpv6_init(void);
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void mptcpv6_handle_mapped(struct sock *sk, bool mapped);
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#elif IS_ENABLED(CONFIG_IPV6)
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static inline int mptcpv6_init(void) { return 0; }
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static inline void mptcpv6_handle_mapped(struct sock *sk, bool mapped) { }
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#endif
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#if defined(CONFIG_MPTCP) && defined(CONFIG_BPF_SYSCALL)
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struct mptcp_sock *bpf_mptcp_sock_from_subflow(struct sock *sk);
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#else
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static inline struct mptcp_sock *bpf_mptcp_sock_from_subflow(struct sock *sk) { return NULL; }
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#endif
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#if !IS_ENABLED(CONFIG_MPTCP)
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struct mptcp_sock { };
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#endif
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#endif /* __NET_MPTCP_H */
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