Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /* Copyright (c) 2019 Facebook  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5) #include <linux/bpf_verifier.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6) #include <linux/bpf.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) #include <linux/btf.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) #include <linux/filter.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #include <net/tcp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <net/bpf_sk_storage.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) static u32 optional_ops[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) 	offsetof(struct tcp_congestion_ops, init),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) 	offsetof(struct tcp_congestion_ops, release),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) 	offsetof(struct tcp_congestion_ops, set_state),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) 	offsetof(struct tcp_congestion_ops, cwnd_event),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) 	offsetof(struct tcp_congestion_ops, in_ack_event),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) 	offsetof(struct tcp_congestion_ops, pkts_acked),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) 	offsetof(struct tcp_congestion_ops, min_tso_segs),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) 	offsetof(struct tcp_congestion_ops, sndbuf_expand),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) 	offsetof(struct tcp_congestion_ops, cong_control),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) static u32 unsupported_ops[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 	offsetof(struct tcp_congestion_ops, get_info),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) static const struct btf_type *tcp_sock_type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) static u32 tcp_sock_id, sock_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) static int bpf_tcp_ca_init(struct btf *btf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 	s32 type_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 	type_id = btf_find_by_name_kind(btf, "sock", BTF_KIND_STRUCT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 	if (type_id < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 	sock_id = type_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 	type_id = btf_find_by_name_kind(btf, "tcp_sock", BTF_KIND_STRUCT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	if (type_id < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 	tcp_sock_id = type_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 	tcp_sock_type = btf_type_by_id(btf, tcp_sock_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) static bool is_optional(u32 member_offset)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 	unsigned int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 	for (i = 0; i < ARRAY_SIZE(optional_ops); i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 		if (member_offset == optional_ops[i])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 			return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 	return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) static bool is_unsupported(u32 member_offset)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 	unsigned int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	for (i = 0; i < ARRAY_SIZE(unsupported_ops); i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 		if (member_offset == unsupported_ops[i])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 			return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) extern struct btf *btf_vmlinux;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) static bool bpf_tcp_ca_is_valid_access(int off, int size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 				       enum bpf_access_type type,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 				       const struct bpf_prog *prog,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 				       struct bpf_insn_access_aux *info)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 	if (off < 0 || off >= sizeof(__u64) * MAX_BPF_FUNC_ARGS)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 		return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 	if (type != BPF_READ)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 		return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 	if (off % size != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 		return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 	if (!btf_ctx_access(off, size, type, prog, info))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 		return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 	if (info->reg_type == PTR_TO_BTF_ID && info->btf_id == sock_id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 		/* promote it to tcp_sock */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 		info->btf_id = tcp_sock_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) static int bpf_tcp_ca_btf_struct_access(struct bpf_verifier_log *log,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 					const struct btf_type *t, int off,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 					int size, enum bpf_access_type atype,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 					u32 *next_btf_id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	size_t end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 	if (atype == BPF_READ)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 		return btf_struct_access(log, t, off, size, atype, next_btf_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	if (t != tcp_sock_type) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 		bpf_log(log, "only read is supported\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 		return -EACCES;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 	switch (off) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	case bpf_ctx_range(struct inet_connection_sock, icsk_ca_priv):
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 		end = offsetofend(struct inet_connection_sock, icsk_ca_priv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	case offsetof(struct inet_connection_sock, icsk_ack.pending):
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 		end = offsetofend(struct inet_connection_sock,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 				  icsk_ack.pending);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	case offsetof(struct tcp_sock, snd_cwnd):
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 		end = offsetofend(struct tcp_sock, snd_cwnd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 	case offsetof(struct tcp_sock, snd_cwnd_cnt):
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 		end = offsetofend(struct tcp_sock, snd_cwnd_cnt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	case offsetof(struct tcp_sock, snd_ssthresh):
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 		end = offsetofend(struct tcp_sock, snd_ssthresh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 	case offsetof(struct tcp_sock, ecn_flags):
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 		end = offsetofend(struct tcp_sock, ecn_flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 	default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 		bpf_log(log, "no write support to tcp_sock at off %d\n", off);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 		return -EACCES;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 	if (off + size > end) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 		bpf_log(log,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 			"write access at off %d with size %d beyond the member of tcp_sock ended at %zu\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 			off, size, end);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 		return -EACCES;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 	return NOT_INIT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) BPF_CALL_2(bpf_tcp_send_ack, struct tcp_sock *, tp, u32, rcv_nxt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 	/* bpf_tcp_ca prog cannot have NULL tp */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 	__tcp_send_ack((struct sock *)tp, rcv_nxt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) static const struct bpf_func_proto bpf_tcp_send_ack_proto = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 	.func		= bpf_tcp_send_ack,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 	.gpl_only	= false,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 	/* In case we want to report error later */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 	.ret_type	= RET_INTEGER,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 	.arg1_type	= ARG_PTR_TO_BTF_ID,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	.arg1_btf_id	= &tcp_sock_id,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 	.arg2_type	= ARG_ANYTHING,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) static const struct bpf_func_proto *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) bpf_tcp_ca_get_func_proto(enum bpf_func_id func_id,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 			  const struct bpf_prog *prog)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 	switch (func_id) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	case BPF_FUNC_tcp_send_ack:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 		return &bpf_tcp_send_ack_proto;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 	case BPF_FUNC_sk_storage_get:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 		return &bpf_sk_storage_get_proto;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 	case BPF_FUNC_sk_storage_delete:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 		return &bpf_sk_storage_delete_proto;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 	default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 		return bpf_base_func_proto(func_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) static const struct bpf_verifier_ops bpf_tcp_ca_verifier_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 	.get_func_proto		= bpf_tcp_ca_get_func_proto,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 	.is_valid_access	= bpf_tcp_ca_is_valid_access,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	.btf_struct_access	= bpf_tcp_ca_btf_struct_access,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) static int bpf_tcp_ca_init_member(const struct btf_type *t,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 				  const struct btf_member *member,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 				  void *kdata, const void *udata)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 	const struct tcp_congestion_ops *utcp_ca;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 	struct tcp_congestion_ops *tcp_ca;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 	int prog_fd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 	u32 moff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 	utcp_ca = (const struct tcp_congestion_ops *)udata;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 	tcp_ca = (struct tcp_congestion_ops *)kdata;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 	moff = btf_member_bit_offset(t, member) / 8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 	switch (moff) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	case offsetof(struct tcp_congestion_ops, flags):
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 		if (utcp_ca->flags & ~TCP_CONG_MASK)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 			return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 		tcp_ca->flags = utcp_ca->flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 		return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 	case offsetof(struct tcp_congestion_ops, name):
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 		if (bpf_obj_name_cpy(tcp_ca->name, utcp_ca->name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 				     sizeof(tcp_ca->name)) <= 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 			return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 		if (tcp_ca_find(utcp_ca->name))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 			return -EEXIST;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 		return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 	if (!btf_type_resolve_func_ptr(btf_vmlinux, member->type, NULL))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 	/* Ensure bpf_prog is provided for compulsory func ptr */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 	prog_fd = (int)(*(unsigned long *)(udata + moff));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 	if (!prog_fd && !is_optional(moff) && !is_unsupported(moff))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) static int bpf_tcp_ca_check_member(const struct btf_type *t,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 				   const struct btf_member *member)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 	if (is_unsupported(btf_member_bit_offset(t, member) / 8))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 		return -ENOTSUPP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) static int bpf_tcp_ca_reg(void *kdata)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 	return tcp_register_congestion_control(kdata);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) static void bpf_tcp_ca_unreg(void *kdata)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 	tcp_unregister_congestion_control(kdata);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) /* Avoid sparse warning.  It is only used in bpf_struct_ops.c. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) extern struct bpf_struct_ops bpf_tcp_congestion_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) struct bpf_struct_ops bpf_tcp_congestion_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 	.verifier_ops = &bpf_tcp_ca_verifier_ops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 	.reg = bpf_tcp_ca_reg,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 	.unreg = bpf_tcp_ca_unreg,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 	.check_member = bpf_tcp_ca_check_member,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 	.init_member = bpf_tcp_ca_init_member,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 	.init = bpf_tcp_ca_init,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 	.name = "tcp_congestion_ops",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) };