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-rw-r--r--include/net/mptcp.h306
1 files changed, 306 insertions, 0 deletions
diff --git a/include/net/mptcp.h b/include/net/mptcp.h
new file mode 100644
index 000000000..3c5c68618
--- /dev/null
+++ b/include/net/mptcp.h
@@ -0,0 +1,306 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Multipath TCP
+ *
+ * Copyright (c) 2017 - 2019, Intel Corporation.
+ */
+
+#ifndef __NET_MPTCP_H
+#define __NET_MPTCP_H
+
+#include <linux/skbuff.h>
+#include <linux/tcp.h>
+#include <linux/types.h>
+
+struct mptcp_info;
+struct mptcp_sock;
+struct seq_file;
+
+/* MPTCP sk_buff extension data */
+struct mptcp_ext {
+ union {
+ u64 data_ack;
+ u32 data_ack32;
+ };
+ u64 data_seq;
+ u32 subflow_seq;
+ u16 data_len;
+ __sum16 csum;
+ u8 use_map:1,
+ dsn64:1,
+ data_fin:1,
+ use_ack:1,
+ ack64:1,
+ mpc_map:1,
+ frozen:1,
+ reset_transient:1;
+ u8 reset_reason:4,
+ csum_reqd:1,
+ infinite_map:1;
+};
+
+#define MPTCPOPT_HMAC_LEN 20
+#define MPTCP_RM_IDS_MAX 8
+
+struct mptcp_rm_list {
+ u8 ids[MPTCP_RM_IDS_MAX];
+ u8 nr;
+};
+
+struct mptcp_addr_info {
+ u8 id;
+ sa_family_t family;
+ __be16 port;
+ union {
+ struct in_addr addr;
+#if IS_ENABLED(CONFIG_MPTCP_IPV6)
+ struct in6_addr addr6;
+#endif
+ };
+};
+
+struct mptcp_out_options {
+#if IS_ENABLED(CONFIG_MPTCP)
+ u16 suboptions;
+ struct mptcp_rm_list rm_list;
+ u8 join_id;
+ u8 backup;
+ u8 reset_reason:4,
+ reset_transient:1,
+ csum_reqd:1,
+ allow_join_id0:1;
+ union {
+ struct {
+ u64 sndr_key;
+ u64 rcvr_key;
+ u64 data_seq;
+ u32 subflow_seq;
+ u16 data_len;
+ __sum16 csum;
+ };
+ struct {
+ struct mptcp_addr_info addr;
+ u64 ahmac;
+ };
+ struct {
+ struct mptcp_ext ext_copy;
+ u64 fail_seq;
+ };
+ struct {
+ u32 nonce;
+ u32 token;
+ u64 thmac;
+ u8 hmac[MPTCPOPT_HMAC_LEN];
+ };
+ };
+#endif
+};
+
+#ifdef CONFIG_MPTCP
+void mptcp_init(void);
+
+static inline bool sk_is_mptcp(const struct sock *sk)
+{
+ return tcp_sk(sk)->is_mptcp;
+}
+
+static inline bool rsk_is_mptcp(const struct request_sock *req)
+{
+ return tcp_rsk(req)->is_mptcp;
+}
+
+static inline bool rsk_drop_req(const struct request_sock *req)
+{
+ return tcp_rsk(req)->is_mptcp && tcp_rsk(req)->drop_req;
+}
+
+void mptcp_space(const struct sock *ssk, int *space, int *full_space);
+bool mptcp_syn_options(struct sock *sk, const struct sk_buff *skb,
+ unsigned int *size, struct mptcp_out_options *opts);
+bool mptcp_synack_options(const struct request_sock *req, unsigned int *size,
+ struct mptcp_out_options *opts);
+bool mptcp_established_options(struct sock *sk, struct sk_buff *skb,
+ unsigned int *size, unsigned int remaining,
+ struct mptcp_out_options *opts);
+bool mptcp_incoming_options(struct sock *sk, struct sk_buff *skb);
+
+void mptcp_write_options(struct tcphdr *th, __be32 *ptr, struct tcp_sock *tp,
+ struct mptcp_out_options *opts);
+
+void mptcp_diag_fill_info(struct mptcp_sock *msk, struct mptcp_info *info);
+
+/* move the skb extension owership, with the assumption that 'to' is
+ * newly allocated
+ */
+static inline void mptcp_skb_ext_move(struct sk_buff *to,
+ struct sk_buff *from)
+{
+ if (!skb_ext_exist(from, SKB_EXT_MPTCP))
+ return;
+
+ if (WARN_ON_ONCE(to->active_extensions))
+ skb_ext_put(to);
+
+ to->active_extensions = from->active_extensions;
+ to->extensions = from->extensions;
+ from->active_extensions = 0;
+}
+
+static inline void mptcp_skb_ext_copy(struct sk_buff *to,
+ struct sk_buff *from)
+{
+ struct mptcp_ext *from_ext;
+
+ from_ext = skb_ext_find(from, SKB_EXT_MPTCP);
+ if (!from_ext)
+ return;
+
+ from_ext->frozen = 1;
+ skb_ext_copy(to, from);
+}
+
+static inline bool mptcp_ext_matches(const struct mptcp_ext *to_ext,
+ const struct mptcp_ext *from_ext)
+{
+ /* MPTCP always clears the ext when adding it to the skb, so
+ * holes do not bother us here
+ */
+ return !from_ext ||
+ (to_ext && from_ext &&
+ !memcmp(from_ext, to_ext, sizeof(struct mptcp_ext)));
+}
+
+/* check if skbs can be collapsed.
+ * MPTCP collapse is allowed if neither @to or @from carry an mptcp data
+ * mapping, or if the extension of @to is the same as @from.
+ * Collapsing is not possible if @to lacks an extension, but @from carries one.
+ */
+static inline bool mptcp_skb_can_collapse(const struct sk_buff *to,
+ const struct sk_buff *from)
+{
+ return mptcp_ext_matches(skb_ext_find(to, SKB_EXT_MPTCP),
+ skb_ext_find(from, SKB_EXT_MPTCP));
+}
+
+void mptcp_seq_show(struct seq_file *seq);
+int mptcp_subflow_init_cookie_req(struct request_sock *req,
+ const struct sock *sk_listener,
+ struct sk_buff *skb);
+struct request_sock *mptcp_subflow_reqsk_alloc(const struct request_sock_ops *ops,
+ struct sock *sk_listener,
+ bool attach_listener);
+
+__be32 mptcp_get_reset_option(const struct sk_buff *skb);
+
+static inline __be32 mptcp_reset_option(const struct sk_buff *skb)
+{
+ if (skb_ext_exist(skb, SKB_EXT_MPTCP))
+ return mptcp_get_reset_option(skb);
+
+ return htonl(0u);
+}
+#else
+
+static inline void mptcp_init(void)
+{
+}
+
+static inline bool sk_is_mptcp(const struct sock *sk)
+{
+ return false;
+}
+
+static inline bool rsk_is_mptcp(const struct request_sock *req)
+{
+ return false;
+}
+
+static inline bool rsk_drop_req(const struct request_sock *req)
+{
+ return false;
+}
+
+static inline bool mptcp_syn_options(struct sock *sk, const struct sk_buff *skb,
+ unsigned int *size,
+ struct mptcp_out_options *opts)
+{
+ return false;
+}
+
+static inline bool mptcp_synack_options(const struct request_sock *req,
+ unsigned int *size,
+ struct mptcp_out_options *opts)
+{
+ return false;
+}
+
+static inline bool mptcp_established_options(struct sock *sk,
+ struct sk_buff *skb,
+ unsigned int *size,
+ unsigned int remaining,
+ struct mptcp_out_options *opts)
+{
+ return false;
+}
+
+static inline bool mptcp_incoming_options(struct sock *sk,
+ struct sk_buff *skb)
+{
+ return true;
+}
+
+static inline void mptcp_skb_ext_move(struct sk_buff *to,
+ const struct sk_buff *from)
+{
+}
+
+static inline void mptcp_skb_ext_copy(struct sk_buff *to,
+ struct sk_buff *from)
+{
+}
+
+static inline bool mptcp_skb_can_collapse(const struct sk_buff *to,
+ const struct sk_buff *from)
+{
+ return true;
+}
+
+static inline void mptcp_space(const struct sock *ssk, int *s, int *fs) { }
+static inline void mptcp_seq_show(struct seq_file *seq) { }
+
+static inline int mptcp_subflow_init_cookie_req(struct request_sock *req,
+ const struct sock *sk_listener,
+ struct sk_buff *skb)
+{
+ return 0; /* TCP fallback */
+}
+
+static inline struct request_sock *mptcp_subflow_reqsk_alloc(const struct request_sock_ops *ops,
+ struct sock *sk_listener,
+ bool attach_listener)
+{
+ return NULL;
+}
+
+static inline __be32 mptcp_reset_option(const struct sk_buff *skb) { return htonl(0u); }
+#endif /* CONFIG_MPTCP */
+
+#if IS_ENABLED(CONFIG_MPTCP_IPV6)
+int mptcpv6_init(void);
+void mptcpv6_handle_mapped(struct sock *sk, bool mapped);
+#elif IS_ENABLED(CONFIG_IPV6)
+static inline int mptcpv6_init(void) { return 0; }
+static inline void mptcpv6_handle_mapped(struct sock *sk, bool mapped) { }
+#endif
+
+#if defined(CONFIG_MPTCP) && defined(CONFIG_BPF_SYSCALL)
+struct mptcp_sock *bpf_mptcp_sock_from_subflow(struct sock *sk);
+#else
+static inline struct mptcp_sock *bpf_mptcp_sock_from_subflow(struct sock *sk) { return NULL; }
+#endif
+
+#if !IS_ENABLED(CONFIG_MPTCP)
+struct mptcp_sock { };
+#endif
+
+#endif /* __NET_MPTCP_H */
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-05 05:29:53 +0000