v4.19.13 snapshot.
diff --git a/include/linux/dccp.h b/include/linux/dccp.h
new file mode 100644
index 0000000..6b64b6c
--- /dev/null
+++ b/include/linux/dccp.h
@@ -0,0 +1,326 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _LINUX_DCCP_H
+#define _LINUX_DCCP_H
+
+
+#include <linux/in.h>
+#include <linux/interrupt.h>
+#include <linux/ktime.h>
+#include <linux/list.h>
+#include <linux/uio.h>
+#include <linux/workqueue.h>
+
+#include <net/inet_connection_sock.h>
+#include <net/inet_sock.h>
+#include <net/inet_timewait_sock.h>
+#include <net/tcp_states.h>
+#include <uapi/linux/dccp.h>
+
+enum dccp_state {
+ DCCP_OPEN = TCP_ESTABLISHED,
+ DCCP_REQUESTING = TCP_SYN_SENT,
+ DCCP_LISTEN = TCP_LISTEN,
+ DCCP_RESPOND = TCP_SYN_RECV,
+ /*
+ * States involved in closing a DCCP connection:
+ * 1) ACTIVE_CLOSEREQ is entered by a server sending a CloseReq.
+ *
+ * 2) CLOSING can have three different meanings (RFC 4340, 8.3):
+ * a. Client has performed active-close, has sent a Close to the server
+ * from state OPEN or PARTOPEN, and is waiting for the final Reset
+ * (in this case, SOCK_DONE == 1).
+ * b. Client is asked to perform passive-close, by receiving a CloseReq
+ * in (PART)OPEN state. It sends a Close and waits for final Reset
+ * (in this case, SOCK_DONE == 0).
+ * c. Server performs an active-close as in (a), keeps TIMEWAIT state.
+ *
+ * 3) The following intermediate states are employed to give passively
+ * closing nodes a chance to process their unread data:
+ * - PASSIVE_CLOSE (from OPEN => CLOSED) and
+ * - PASSIVE_CLOSEREQ (from (PART)OPEN to CLOSING; case (b) above).
+ */
+ DCCP_ACTIVE_CLOSEREQ = TCP_FIN_WAIT1,
+ DCCP_PASSIVE_CLOSE = TCP_CLOSE_WAIT, /* any node receiving a Close */
+ DCCP_CLOSING = TCP_CLOSING,
+ DCCP_TIME_WAIT = TCP_TIME_WAIT,
+ DCCP_CLOSED = TCP_CLOSE,
+ DCCP_NEW_SYN_RECV = TCP_NEW_SYN_RECV,
+ DCCP_PARTOPEN = TCP_MAX_STATES,
+ DCCP_PASSIVE_CLOSEREQ, /* clients receiving CloseReq */
+ DCCP_MAX_STATES
+};
+
+enum {
+ DCCPF_OPEN = TCPF_ESTABLISHED,
+ DCCPF_REQUESTING = TCPF_SYN_SENT,
+ DCCPF_LISTEN = TCPF_LISTEN,
+ DCCPF_RESPOND = TCPF_SYN_RECV,
+ DCCPF_ACTIVE_CLOSEREQ = TCPF_FIN_WAIT1,
+ DCCPF_CLOSING = TCPF_CLOSING,
+ DCCPF_TIME_WAIT = TCPF_TIME_WAIT,
+ DCCPF_CLOSED = TCPF_CLOSE,
+ DCCPF_NEW_SYN_RECV = TCPF_NEW_SYN_RECV,
+ DCCPF_PARTOPEN = (1 << DCCP_PARTOPEN),
+};
+
+static inline struct dccp_hdr *dccp_hdr(const struct sk_buff *skb)
+{
+ return (struct dccp_hdr *)skb_transport_header(skb);
+}
+
+static inline struct dccp_hdr *dccp_zeroed_hdr(struct sk_buff *skb, int headlen)
+{
+ skb_push(skb, headlen);
+ skb_reset_transport_header(skb);
+ return memset(skb_transport_header(skb), 0, headlen);
+}
+
+static inline struct dccp_hdr_ext *dccp_hdrx(const struct dccp_hdr *dh)
+{
+ return (struct dccp_hdr_ext *)((unsigned char *)dh + sizeof(*dh));
+}
+
+static inline unsigned int __dccp_basic_hdr_len(const struct dccp_hdr *dh)
+{
+ return sizeof(*dh) + (dh->dccph_x ? sizeof(struct dccp_hdr_ext) : 0);
+}
+
+static inline unsigned int dccp_basic_hdr_len(const struct sk_buff *skb)
+{
+ const struct dccp_hdr *dh = dccp_hdr(skb);
+ return __dccp_basic_hdr_len(dh);
+}
+
+static inline __u64 dccp_hdr_seq(const struct dccp_hdr *dh)
+{
+ __u64 seq_nr = ntohs(dh->dccph_seq);
+
+ if (dh->dccph_x != 0)
+ seq_nr = (seq_nr << 32) + ntohl(dccp_hdrx(dh)->dccph_seq_low);
+ else
+ seq_nr += (u32)dh->dccph_seq2 << 16;
+
+ return seq_nr;
+}
+
+static inline struct dccp_hdr_request *dccp_hdr_request(struct sk_buff *skb)
+{
+ return (struct dccp_hdr_request *)(skb_transport_header(skb) +
+ dccp_basic_hdr_len(skb));
+}
+
+static inline struct dccp_hdr_ack_bits *dccp_hdr_ack_bits(const struct sk_buff *skb)
+{
+ return (struct dccp_hdr_ack_bits *)(skb_transport_header(skb) +
+ dccp_basic_hdr_len(skb));
+}
+
+static inline u64 dccp_hdr_ack_seq(const struct sk_buff *skb)
+{
+ const struct dccp_hdr_ack_bits *dhack = dccp_hdr_ack_bits(skb);
+ return ((u64)ntohs(dhack->dccph_ack_nr_high) << 32) + ntohl(dhack->dccph_ack_nr_low);
+}
+
+static inline struct dccp_hdr_response *dccp_hdr_response(struct sk_buff *skb)
+{
+ return (struct dccp_hdr_response *)(skb_transport_header(skb) +
+ dccp_basic_hdr_len(skb));
+}
+
+static inline struct dccp_hdr_reset *dccp_hdr_reset(struct sk_buff *skb)
+{
+ return (struct dccp_hdr_reset *)(skb_transport_header(skb) +
+ dccp_basic_hdr_len(skb));
+}
+
+static inline unsigned int __dccp_hdr_len(const struct dccp_hdr *dh)
+{
+ return __dccp_basic_hdr_len(dh) +
+ dccp_packet_hdr_len(dh->dccph_type);
+}
+
+static inline unsigned int dccp_hdr_len(const struct sk_buff *skb)
+{
+ return __dccp_hdr_len(dccp_hdr(skb));
+}
+
+/**
+ * struct dccp_request_sock - represent DCCP-specific connection request
+ * @dreq_inet_rsk: structure inherited from
+ * @dreq_iss: initial sequence number, sent on the first Response (RFC 4340, 7.1)
+ * @dreq_gss: greatest sequence number sent (for retransmitted Responses)
+ * @dreq_isr: initial sequence number received in the first Request
+ * @dreq_gsr: greatest sequence number received (for retransmitted Request(s))
+ * @dreq_service: service code present on the Request (there is just one)
+ * @dreq_featneg: feature negotiation options for this connection
+ * The following two fields are analogous to the ones in dccp_sock:
+ * @dreq_timestamp_echo: last received timestamp to echo (13.1)
+ * @dreq_timestamp_echo: the time of receiving the last @dreq_timestamp_echo
+ */
+struct dccp_request_sock {
+ struct inet_request_sock dreq_inet_rsk;
+ __u64 dreq_iss;
+ __u64 dreq_gss;
+ __u64 dreq_isr;
+ __u64 dreq_gsr;
+ __be32 dreq_service;
+ spinlock_t dreq_lock;
+ struct list_head dreq_featneg;
+ __u32 dreq_timestamp_echo;
+ __u32 dreq_timestamp_time;
+};
+
+static inline struct dccp_request_sock *dccp_rsk(const struct request_sock *req)
+{
+ return (struct dccp_request_sock *)req;
+}
+
+extern struct inet_timewait_death_row dccp_death_row;
+
+extern int dccp_parse_options(struct sock *sk, struct dccp_request_sock *dreq,
+ struct sk_buff *skb);
+
+struct dccp_options_received {
+ u64 dccpor_ndp:48;
+ u32 dccpor_timestamp;
+ u32 dccpor_timestamp_echo;
+ u32 dccpor_elapsed_time;
+};
+
+struct ccid;
+
+enum dccp_role {
+ DCCP_ROLE_UNDEFINED,
+ DCCP_ROLE_LISTEN,
+ DCCP_ROLE_CLIENT,
+ DCCP_ROLE_SERVER,
+};
+
+struct dccp_service_list {
+ __u32 dccpsl_nr;
+ __be32 dccpsl_list[0];
+};
+
+#define DCCP_SERVICE_INVALID_VALUE htonl((__u32)-1)
+#define DCCP_SERVICE_CODE_IS_ABSENT 0
+
+static inline bool dccp_list_has_service(const struct dccp_service_list *sl,
+ const __be32 service)
+{
+ if (likely(sl != NULL)) {
+ u32 i = sl->dccpsl_nr;
+ while (i--)
+ if (sl->dccpsl_list[i] == service)
+ return true;
+ }
+ return false;
+}
+
+struct dccp_ackvec;
+
+/**
+ * struct dccp_sock - DCCP socket state
+ *
+ * @dccps_swl - sequence number window low
+ * @dccps_swh - sequence number window high
+ * @dccps_awl - acknowledgement number window low
+ * @dccps_awh - acknowledgement number window high
+ * @dccps_iss - initial sequence number sent
+ * @dccps_isr - initial sequence number received
+ * @dccps_osr - first OPEN sequence number received
+ * @dccps_gss - greatest sequence number sent
+ * @dccps_gsr - greatest valid sequence number received
+ * @dccps_gar - greatest valid ack number received on a non-Sync; initialized to %dccps_iss
+ * @dccps_service - first (passive sock) or unique (active sock) service code
+ * @dccps_service_list - second .. last service code on passive socket
+ * @dccps_timestamp_echo - latest timestamp received on a TIMESTAMP option
+ * @dccps_timestamp_time - time of receiving latest @dccps_timestamp_echo
+ * @dccps_l_ack_ratio - feature-local Ack Ratio
+ * @dccps_r_ack_ratio - feature-remote Ack Ratio
+ * @dccps_l_seq_win - local Sequence Window (influences ack number validity)
+ * @dccps_r_seq_win - remote Sequence Window (influences seq number validity)
+ * @dccps_pcslen - sender partial checksum coverage (via sockopt)
+ * @dccps_pcrlen - receiver partial checksum coverage (via sockopt)
+ * @dccps_send_ndp_count - local Send NDP Count feature (7.7.2)
+ * @dccps_ndp_count - number of Non Data Packets since last data packet
+ * @dccps_mss_cache - current value of MSS (path MTU minus header sizes)
+ * @dccps_rate_last - timestamp for rate-limiting DCCP-Sync (RFC 4340, 7.5.4)
+ * @dccps_featneg - tracks feature-negotiation state (mostly during handshake)
+ * @dccps_hc_rx_ackvec - rx half connection ack vector
+ * @dccps_hc_rx_ccid - CCID used for the receiver (or receiving half-connection)
+ * @dccps_hc_tx_ccid - CCID used for the sender (or sending half-connection)
+ * @dccps_options_received - parsed set of retrieved options
+ * @dccps_qpolicy - TX dequeueing policy, one of %dccp_packet_dequeueing_policy
+ * @dccps_tx_qlen - maximum length of the TX queue
+ * @dccps_role - role of this sock, one of %dccp_role
+ * @dccps_hc_rx_insert_options - receiver wants to add options when acking
+ * @dccps_hc_tx_insert_options - sender wants to add options when sending
+ * @dccps_server_timewait - server holds timewait state on close (RFC 4340, 8.3)
+ * @dccps_sync_scheduled - flag which signals "send out-of-band message soon"
+ * @dccps_xmitlet - tasklet scheduled by the TX CCID to dequeue data packets
+ * @dccps_xmit_timer - used by the TX CCID to delay sending (rate-based pacing)
+ * @dccps_syn_rtt - RTT sample from Request/Response exchange (in usecs)
+ */
+struct dccp_sock {
+ /* inet_connection_sock has to be the first member of dccp_sock */
+ struct inet_connection_sock dccps_inet_connection;
+#define dccps_syn_rtt dccps_inet_connection.icsk_ack.lrcvtime
+ __u64 dccps_swl;
+ __u64 dccps_swh;
+ __u64 dccps_awl;
+ __u64 dccps_awh;
+ __u64 dccps_iss;
+ __u64 dccps_isr;
+ __u64 dccps_osr;
+ __u64 dccps_gss;
+ __u64 dccps_gsr;
+ __u64 dccps_gar;
+ __be32 dccps_service;
+ __u32 dccps_mss_cache;
+ struct dccp_service_list *dccps_service_list;
+ __u32 dccps_timestamp_echo;
+ __u32 dccps_timestamp_time;
+ __u16 dccps_l_ack_ratio;
+ __u16 dccps_r_ack_ratio;
+ __u64 dccps_l_seq_win:48;
+ __u64 dccps_r_seq_win:48;
+ __u8 dccps_pcslen:4;
+ __u8 dccps_pcrlen:4;
+ __u8 dccps_send_ndp_count:1;
+ __u64 dccps_ndp_count:48;
+ unsigned long dccps_rate_last;
+ struct list_head dccps_featneg;
+ struct dccp_ackvec *dccps_hc_rx_ackvec;
+ struct ccid *dccps_hc_rx_ccid;
+ struct ccid *dccps_hc_tx_ccid;
+ struct dccp_options_received dccps_options_received;
+ __u8 dccps_qpolicy;
+ __u32 dccps_tx_qlen;
+ enum dccp_role dccps_role:2;
+ __u8 dccps_hc_rx_insert_options:1;
+ __u8 dccps_hc_tx_insert_options:1;
+ __u8 dccps_server_timewait:1;
+ __u8 dccps_sync_scheduled:1;
+ struct tasklet_struct dccps_xmitlet;
+ struct timer_list dccps_xmit_timer;
+};
+
+static inline struct dccp_sock *dccp_sk(const struct sock *sk)
+{
+ return (struct dccp_sock *)sk;
+}
+
+static inline const char *dccp_role(const struct sock *sk)
+{
+ switch (dccp_sk(sk)->dccps_role) {
+ case DCCP_ROLE_UNDEFINED: return "undefined";
+ case DCCP_ROLE_LISTEN: return "listen";
+ case DCCP_ROLE_SERVER: return "server";
+ case DCCP_ROLE_CLIENT: return "client";
+ }
+ return NULL;
+}
+
+extern void dccp_syn_ack_timeout(const struct request_sock *req);
+
+#endif /* _LINUX_DCCP_H */