242 lines
6.6 KiB
C
242 lines
6.6 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __BPF_TCP_HELPERS_H
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#define __BPF_TCP_HELPERS_H
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#include <stdbool.h>
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#include <linux/types.h>
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#include <bpf/bpf_helpers.h>
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#include <bpf/bpf_core_read.h>
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#include <bpf/bpf_tracing.h>
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#define BPF_STRUCT_OPS(name, args...) \
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SEC("struct_ops/"#name) \
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BPF_PROG(name, args)
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#ifndef SOL_TCP
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#define SOL_TCP 6
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#endif
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#ifndef TCP_CA_NAME_MAX
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#define TCP_CA_NAME_MAX 16
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#endif
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#define tcp_jiffies32 ((__u32)bpf_jiffies64())
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struct sock_common {
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unsigned char skc_state;
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__u16 skc_num;
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} __attribute__((preserve_access_index));
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enum sk_pacing {
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SK_PACING_NONE = 0,
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SK_PACING_NEEDED = 1,
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SK_PACING_FQ = 2,
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};
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struct sock {
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struct sock_common __sk_common;
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#define sk_state __sk_common.skc_state
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unsigned long sk_pacing_rate;
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__u32 sk_pacing_status; /* see enum sk_pacing */
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} __attribute__((preserve_access_index));
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struct inet_sock {
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struct sock sk;
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} __attribute__((preserve_access_index));
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struct inet_connection_sock {
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struct inet_sock icsk_inet;
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__u8 icsk_ca_state:6,
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icsk_ca_setsockopt:1,
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icsk_ca_dst_locked:1;
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struct {
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__u8 pending;
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} icsk_ack;
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__u64 icsk_ca_priv[104 / sizeof(__u64)];
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} __attribute__((preserve_access_index));
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struct request_sock {
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struct sock_common __req_common;
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} __attribute__((preserve_access_index));
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struct tcp_sock {
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struct inet_connection_sock inet_conn;
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__u32 rcv_nxt;
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__u32 snd_nxt;
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__u32 snd_una;
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__u32 window_clamp;
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__u8 ecn_flags;
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__u32 delivered;
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__u32 delivered_ce;
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__u32 snd_cwnd;
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__u32 snd_cwnd_cnt;
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__u32 snd_cwnd_clamp;
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__u32 snd_ssthresh;
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__u8 syn_data:1, /* SYN includes data */
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syn_fastopen:1, /* SYN includes Fast Open option */
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syn_fastopen_exp:1,/* SYN includes Fast Open exp. option */
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syn_fastopen_ch:1, /* Active TFO re-enabling probe */
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syn_data_acked:1,/* data in SYN is acked by SYN-ACK */
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save_syn:1, /* Save headers of SYN packet */
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is_cwnd_limited:1,/* forward progress limited by snd_cwnd? */
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syn_smc:1; /* SYN includes SMC */
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__u32 max_packets_out;
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__u32 lsndtime;
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__u32 prior_cwnd;
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__u64 tcp_mstamp; /* most recent packet received/sent */
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bool is_mptcp;
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} __attribute__((preserve_access_index));
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static __always_inline struct inet_connection_sock *inet_csk(const struct sock *sk)
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{
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return (struct inet_connection_sock *)sk;
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}
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static __always_inline void *inet_csk_ca(const struct sock *sk)
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{
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return (void *)inet_csk(sk)->icsk_ca_priv;
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}
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static __always_inline struct tcp_sock *tcp_sk(const struct sock *sk)
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{
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return (struct tcp_sock *)sk;
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}
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static __always_inline bool before(__u32 seq1, __u32 seq2)
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{
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return (__s32)(seq1-seq2) < 0;
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}
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#define after(seq2, seq1) before(seq1, seq2)
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#define TCP_ECN_OK 1
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#define TCP_ECN_QUEUE_CWR 2
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#define TCP_ECN_DEMAND_CWR 4
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#define TCP_ECN_SEEN 8
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enum inet_csk_ack_state_t {
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ICSK_ACK_SCHED = 1,
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ICSK_ACK_TIMER = 2,
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ICSK_ACK_PUSHED = 4,
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ICSK_ACK_PUSHED2 = 8,
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ICSK_ACK_NOW = 16 /* Send the next ACK immediately (once) */
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};
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enum tcp_ca_event {
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CA_EVENT_TX_START = 0,
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CA_EVENT_CWND_RESTART = 1,
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CA_EVENT_COMPLETE_CWR = 2,
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CA_EVENT_LOSS = 3,
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CA_EVENT_ECN_NO_CE = 4,
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CA_EVENT_ECN_IS_CE = 5,
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};
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struct ack_sample {
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__u32 pkts_acked;
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__s32 rtt_us;
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__u32 in_flight;
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} __attribute__((preserve_access_index));
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struct rate_sample {
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__u64 prior_mstamp; /* starting timestamp for interval */
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__u32 prior_delivered; /* tp->delivered at "prior_mstamp" */
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__s32 delivered; /* number of packets delivered over interval */
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long interval_us; /* time for tp->delivered to incr "delivered" */
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__u32 snd_interval_us; /* snd interval for delivered packets */
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__u32 rcv_interval_us; /* rcv interval for delivered packets */
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long rtt_us; /* RTT of last (S)ACKed packet (or -1) */
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int losses; /* number of packets marked lost upon ACK */
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__u32 acked_sacked; /* number of packets newly (S)ACKed upon ACK */
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__u32 prior_in_flight; /* in flight before this ACK */
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bool is_app_limited; /* is sample from packet with bubble in pipe? */
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bool is_retrans; /* is sample from retransmission? */
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bool is_ack_delayed; /* is this (likely) a delayed ACK? */
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} __attribute__((preserve_access_index));
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#define TCP_CA_NAME_MAX 16
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#define TCP_CONG_NEEDS_ECN 0x2
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struct tcp_congestion_ops {
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char name[TCP_CA_NAME_MAX];
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__u32 flags;
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/* initialize private data (optional) */
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void (*init)(struct sock *sk);
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/* cleanup private data (optional) */
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void (*release)(struct sock *sk);
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/* return slow start threshold (required) */
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__u32 (*ssthresh)(struct sock *sk);
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/* do new cwnd calculation (required) */
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void (*cong_avoid)(struct sock *sk, __u32 ack, __u32 acked);
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/* call before changing ca_state (optional) */
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void (*set_state)(struct sock *sk, __u8 new_state);
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/* call when cwnd event occurs (optional) */
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void (*cwnd_event)(struct sock *sk, enum tcp_ca_event ev);
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/* call when ack arrives (optional) */
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void (*in_ack_event)(struct sock *sk, __u32 flags);
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/* new value of cwnd after loss (required) */
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__u32 (*undo_cwnd)(struct sock *sk);
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/* hook for packet ack accounting (optional) */
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void (*pkts_acked)(struct sock *sk, const struct ack_sample *sample);
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/* override sysctl_tcp_min_tso_segs */
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__u32 (*min_tso_segs)(struct sock *sk);
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/* returns the multiplier used in tcp_sndbuf_expand (optional) */
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__u32 (*sndbuf_expand)(struct sock *sk);
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/* call when packets are delivered to update cwnd and pacing rate,
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* after all the ca_state processing. (optional)
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*/
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void (*cong_control)(struct sock *sk, const struct rate_sample *rs);
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void *owner;
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};
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#define min(a, b) ((a) < (b) ? (a) : (b))
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#define max(a, b) ((a) > (b) ? (a) : (b))
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#define min_not_zero(x, y) ({ \
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typeof(x) __x = (x); \
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typeof(y) __y = (y); \
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__x == 0 ? __y : ((__y == 0) ? __x : min(__x, __y)); })
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static __always_inline bool tcp_in_slow_start(const struct tcp_sock *tp)
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{
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return tp->snd_cwnd < tp->snd_ssthresh;
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}
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static __always_inline bool tcp_is_cwnd_limited(const struct sock *sk)
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{
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const struct tcp_sock *tp = tcp_sk(sk);
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/* If in slow start, ensure cwnd grows to twice what was ACKed. */
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if (tcp_in_slow_start(tp))
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return tp->snd_cwnd < 2 * tp->max_packets_out;
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return !!BPF_CORE_READ_BITFIELD(tp, is_cwnd_limited);
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}
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static __always_inline bool tcp_cc_eq(const char *a, const char *b)
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{
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int i;
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for (i = 0; i < TCP_CA_NAME_MAX; i++) {
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if (a[i] != b[i])
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return false;
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if (!a[i])
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break;
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}
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return true;
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}
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extern __u32 tcp_slow_start(struct tcp_sock *tp, __u32 acked) __ksym;
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extern void tcp_cong_avoid_ai(struct tcp_sock *tp, __u32 w, __u32 acked) __ksym;
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struct mptcp_sock {
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struct inet_connection_sock sk;
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__u32 token;
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struct sock *first;
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char ca_name[TCP_CA_NAME_MAX];
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} __attribute__((preserve_access_index));
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#endif
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