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e95e85b891
Currently BPF selftests will fail to compile if CONFIG_SMC
is not set.
Use BPF CO-RE to work around the case where CONFIG_SMC is
not set; use ___local variants of relevant structures and
utilize bpf_core_field_exists() for net->smc.
The test continues to pass where
CONFIG_SMC=y
CONFIG_SMC_HS_CTRL_BPF=y
but these changes allow the selftests to build in the absence
of CONFIG_SMC=y.
Also ensure that we get a pure skip rather than a skip+fail
by removing the SMC is unsupported part from the ASSERT_FALSE()
in get_smc_nl_family(); doing this means we get a skip without
a fail when CONFIG_SMC is not set:
$ sudo ./test_progs -t bpf_smc
Summary: 1/0 PASSED, 1 SKIPPED, 0 FAILED
Fixes: beb3c67297 ("bpf/selftests: Add selftest for bpf_smc_hs_ctrl")
Reported-by: Colm Harrington <colm.harrington@oracle.com>
Signed-off-by: Alan Maguire <alan.maguire@oracle.com>
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Tested-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Link: https://patch.msgid.link/20260310111330.601765-1-alan.maguire@oracle.com
142 lines
3.2 KiB
C
142 lines
3.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include "vmlinux.h"
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#include <bpf/bpf_helpers.h>
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#include <bpf/bpf_tracing.h>
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#include "bpf_tracing_net.h"
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char _license[] SEC("license") = "GPL";
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#ifndef SMC_HS_CTRL_NAME_MAX
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#define SMC_HS_CTRL_NAME_MAX 16
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#endif
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enum {
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BPF_SMC_LISTEN = 10,
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};
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struct smc_sock___local {
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struct sock sk;
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struct smc_sock *listen_smc;
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bool use_fallback;
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} __attribute__((preserve_access_index));
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struct smc_hs_ctrl___local {
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char name[SMC_HS_CTRL_NAME_MAX];
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int (*syn_option)(struct tcp_sock *);
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int (*synack_option)(const struct tcp_sock *, struct inet_request_sock *);
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} __attribute__((preserve_access_index));
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struct netns_smc___local {
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struct smc_hs_ctrl___local *hs_ctrl;
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} __attribute__((preserve_access_index));
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struct net___local {
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struct netns_smc___local smc;
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} __attribute__((preserve_access_index));
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int smc_cnt = 0;
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int fallback_cnt = 0;
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SEC("fentry/smc_release")
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int BPF_PROG(bpf_smc_release, struct socket *sock)
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{
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/* only count from one side (client) */
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if (sock->sk->__sk_common.skc_state == BPF_SMC_LISTEN)
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return 0;
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smc_cnt++;
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return 0;
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}
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SEC("fentry/smc_switch_to_fallback")
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int BPF_PROG(bpf_smc_switch_to_fallback, struct smc_sock___local *smc)
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{
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/* only count from one side (client) */
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if (smc && !smc->listen_smc)
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fallback_cnt++;
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return 0;
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}
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/* go with default value if no strat was found */
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bool default_ip_strat_value = true;
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struct smc_policy_ip_key {
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__u32 sip;
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__u32 dip;
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};
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struct smc_policy_ip_value {
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__u8 mode;
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};
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struct {
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__uint(type, BPF_MAP_TYPE_HASH);
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__uint(key_size, sizeof(struct smc_policy_ip_key));
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__uint(value_size, sizeof(struct smc_policy_ip_value));
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__uint(max_entries, 128);
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__uint(map_flags, BPF_F_NO_PREALLOC);
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} smc_policy_ip SEC(".maps");
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static bool smc_check(__u32 src, __u32 dst)
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{
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struct smc_policy_ip_value *value;
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struct smc_policy_ip_key key = {
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.sip = src,
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.dip = dst,
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};
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value = bpf_map_lookup_elem(&smc_policy_ip, &key);
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return value ? value->mode : default_ip_strat_value;
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}
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SEC("fmod_ret/update_socket_protocol")
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int BPF_PROG(smc_run, int family, int type, int protocol)
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{
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struct task_struct *task;
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if (family != AF_INET && family != AF_INET6)
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return protocol;
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if ((type & 0xf) != SOCK_STREAM)
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return protocol;
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if (protocol != 0 && protocol != IPPROTO_TCP)
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return protocol;
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task = bpf_get_current_task_btf();
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/* Prevent from affecting other tests */
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if (!task) {
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return protocol;
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} else {
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struct net___local *net = (struct net___local *)task->nsproxy->net_ns;
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if (!bpf_core_field_exists(struct net___local, smc) || !net->smc.hs_ctrl)
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return protocol;
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}
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return IPPROTO_SMC;
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}
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SEC("struct_ops")
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int BPF_PROG(bpf_smc_set_tcp_option_cond, const struct tcp_sock *tp,
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struct inet_request_sock *ireq)
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{
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return smc_check(ireq->req.__req_common.skc_daddr,
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ireq->req.__req_common.skc_rcv_saddr);
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}
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SEC("struct_ops")
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int BPF_PROG(bpf_smc_set_tcp_option, struct tcp_sock *tp)
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{
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return smc_check(tp->inet_conn.icsk_inet.sk.__sk_common.skc_rcv_saddr,
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tp->inet_conn.icsk_inet.sk.__sk_common.skc_daddr);
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}
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SEC(".struct_ops")
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struct smc_hs_ctrl___local linkcheck = {
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.name = "linkcheck",
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.syn_option = (void *)bpf_smc_set_tcp_option,
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.synack_option = (void *)bpf_smc_set_tcp_option_cond,
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};
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