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dd65acf72d
Since commit 6c4fc209fc
("bpf: remove useless version check for prog
load") these "version" sections, which result in bpf_attr.kern_version
being set, have been unnecessary.
Remove them so that it's obvious to folks using selftests as a guide that
"modern" BPF progs don't need this section.
Signed-off-by: Dave Marchevsky <davemarchevsky@fb.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20211007231234.2223081-1-davemarchevsky@fb.com
167 lines
4 KiB
C
167 lines
4 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <stddef.h>
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#include <string.h>
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#include <netinet/in.h>
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#include <linux/bpf.h>
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#include <linux/if_ether.h>
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#include <linux/if_packet.h>
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#include <linux/ip.h>
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#include <linux/ipv6.h>
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#include <linux/types.h>
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#include <linux/socket.h>
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#include <linux/tcp.h>
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#include <bpf/bpf_helpers.h>
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#include <bpf/bpf_endian.h>
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#include "bpf_tcp_helpers.h"
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#include "test_tcpbpf.h"
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struct tcpbpf_globals global = {};
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/**
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* SOL_TCP is defined in <netinet/tcp.h> while
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* TCP_SAVED_SYN is defined in already included <linux/tcp.h>
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*/
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#ifndef SOL_TCP
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#define SOL_TCP 6
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#endif
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static __always_inline int get_tp_window_clamp(struct bpf_sock_ops *skops)
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{
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struct bpf_sock *sk;
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struct tcp_sock *tp;
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sk = skops->sk;
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if (!sk)
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return -1;
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tp = bpf_skc_to_tcp_sock(sk);
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if (!tp)
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return -1;
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return tp->window_clamp;
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}
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SEC("sockops")
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int bpf_testcb(struct bpf_sock_ops *skops)
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{
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char header[sizeof(struct ipv6hdr) + sizeof(struct tcphdr)];
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struct bpf_sock_ops *reuse = skops;
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struct tcphdr *thdr;
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int window_clamp = 9216;
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int good_call_rv = 0;
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int bad_call_rv = 0;
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int save_syn = 1;
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int rv = -1;
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int v = 0;
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int op;
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/* Test reading fields in bpf_sock_ops using single register */
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asm volatile (
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"%[reuse] = *(u32 *)(%[reuse] +96)"
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: [reuse] "+r"(reuse)
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:);
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asm volatile (
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"%[op] = *(u32 *)(%[skops] +96)"
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: [op] "+r"(op)
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: [skops] "r"(skops)
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:);
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asm volatile (
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"r9 = %[skops];\n"
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"r8 = *(u32 *)(r9 +164);\n"
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"*(u32 *)(r9 +164) = r8;\n"
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:: [skops] "r"(skops)
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: "r9", "r8");
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asm volatile (
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"r1 = %[skops];\n"
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"r1 = *(u64 *)(r1 +184);\n"
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"if r1 == 0 goto +1;\n"
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"r1 = *(u32 *)(r1 +4);\n"
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:: [skops] "r"(skops):"r1");
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asm volatile (
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"r9 = %[skops];\n"
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"r9 = *(u64 *)(r9 +184);\n"
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"if r9 == 0 goto +1;\n"
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"r9 = *(u32 *)(r9 +4);\n"
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:: [skops] "r"(skops):"r9");
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asm volatile (
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"r1 = %[skops];\n"
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"r2 = *(u64 *)(r1 +184);\n"
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"if r2 == 0 goto +1;\n"
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"r2 = *(u32 *)(r2 +4);\n"
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:: [skops] "r"(skops):"r1", "r2");
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op = (int) skops->op;
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global.event_map |= (1 << op);
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switch (op) {
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case BPF_SOCK_OPS_TCP_CONNECT_CB:
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rv = bpf_setsockopt(skops, SOL_TCP, TCP_WINDOW_CLAMP,
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&window_clamp, sizeof(window_clamp));
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global.window_clamp_client = get_tp_window_clamp(skops);
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break;
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case BPF_SOCK_OPS_ACTIVE_ESTABLISHED_CB:
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/* Test failure to set largest cb flag (assumes not defined) */
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global.bad_cb_test_rv = bpf_sock_ops_cb_flags_set(skops, 0x80);
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/* Set callback */
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global.good_cb_test_rv = bpf_sock_ops_cb_flags_set(skops,
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BPF_SOCK_OPS_STATE_CB_FLAG);
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break;
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case BPF_SOCK_OPS_PASSIVE_ESTABLISHED_CB:
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skops->sk_txhash = 0x12345f;
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v = 0xff;
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rv = bpf_setsockopt(skops, SOL_IPV6, IPV6_TCLASS, &v,
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sizeof(v));
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if (skops->family == AF_INET6) {
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v = bpf_getsockopt(skops, IPPROTO_TCP, TCP_SAVED_SYN,
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header, (sizeof(struct ipv6hdr) +
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sizeof(struct tcphdr)));
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if (!v) {
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int offset = sizeof(struct ipv6hdr);
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thdr = (struct tcphdr *)(header + offset);
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v = thdr->syn;
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global.tcp_saved_syn = v;
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}
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}
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rv = bpf_setsockopt(skops, SOL_TCP, TCP_WINDOW_CLAMP,
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&window_clamp, sizeof(window_clamp));
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global.window_clamp_server = get_tp_window_clamp(skops);
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break;
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case BPF_SOCK_OPS_RTO_CB:
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break;
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case BPF_SOCK_OPS_RETRANS_CB:
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break;
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case BPF_SOCK_OPS_STATE_CB:
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if (skops->args[1] == BPF_TCP_CLOSE) {
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if (skops->args[0] == BPF_TCP_LISTEN) {
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global.num_listen++;
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} else {
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global.total_retrans = skops->total_retrans;
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global.data_segs_in = skops->data_segs_in;
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global.data_segs_out = skops->data_segs_out;
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global.bytes_received = skops->bytes_received;
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global.bytes_acked = skops->bytes_acked;
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}
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global.num_close_events++;
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}
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break;
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case BPF_SOCK_OPS_TCP_LISTEN_CB:
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bpf_sock_ops_cb_flags_set(skops, BPF_SOCK_OPS_STATE_CB_FLAG);
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v = bpf_setsockopt(skops, IPPROTO_TCP, TCP_SAVE_SYN,
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&save_syn, sizeof(save_syn));
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/* Update global map w/ result of setsock opt */
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global.tcp_save_syn = v;
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break;
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default:
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rv = -1;
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}
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skops->reply = rv;
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return 1;
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}
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char _license[] SEC("license") = "GPL";
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