netdev - [RFC bpf-next 5/7] libbpf: Add support for inet

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Date:   Tue, 18 Jun 2019 15:00:48 +0200
From:   Jakub Sitnicki <jakub@...udflare.com>
To:     netdev@...r.kernel.org, bpf@...r.kernel.org
Cc:     kernel-team@...udflare.com
Subject: [RFC bpf-next 5/7] libbpf: Add support for inet_lookup program type

Make libbpf aware of the newly added program type. Reserve a section name
for it.

Signed-off-by: Jakub Sitnicki <jakub@...udflare.com>
---
 tools/lib/bpf/libbpf.c        | 4 ++++
 tools/lib/bpf/libbpf.h        | 2 ++
 tools/lib/bpf/libbpf.map      | 2 ++
 tools/lib/bpf/libbpf_probes.c | 1 +
 4 files changed, 9 insertions(+)

diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index e725fa86b189..84dfdfc0a971 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -2244,6 +2244,7 @@ static bool bpf_prog_type__needs_kver(enum bpf_prog_type type)
 	case BPF_PROG_TYPE_RAW_TRACEPOINT_WRITABLE:
 	case BPF_PROG_TYPE_PERF_EVENT:
 	case BPF_PROG_TYPE_CGROUP_SYSCTL:
+	case BPF_PROG_TYPE_INET_LOOKUP:
 		return false;
 	case BPF_PROG_TYPE_KPROBE:
 	default:
@@ -3110,6 +3111,7 @@ BPF_PROG_TYPE_FNS(tracepoint, BPF_PROG_TYPE_TRACEPOINT);
 BPF_PROG_TYPE_FNS(raw_tracepoint, BPF_PROG_TYPE_RAW_TRACEPOINT);
 BPF_PROG_TYPE_FNS(xdp, BPF_PROG_TYPE_XDP);
 BPF_PROG_TYPE_FNS(perf_event, BPF_PROG_TYPE_PERF_EVENT);
+BPF_PROG_TYPE_FNS(inet_lookup, BPF_PROG_TYPE_INET_LOOKUP);
 
 void bpf_program__set_expected_attach_type(struct bpf_program *prog,
 					   enum bpf_attach_type type)
@@ -3197,6 +3199,8 @@ static const struct {
 						BPF_CGROUP_UDP6_SENDMSG),
 	BPF_EAPROG_SEC("cgroup/sysctl",		BPF_PROG_TYPE_CGROUP_SYSCTL,
 						BPF_CGROUP_SYSCTL),
+	BPF_EAPROG_SEC("inet_lookup",		BPF_PROG_TYPE_INET_LOOKUP,
+						BPF_INET_LOOKUP),
 };
 
 #undef BPF_PROG_SEC_IMPL
diff --git a/tools/lib/bpf/libbpf.h b/tools/lib/bpf/libbpf.h
index 2e594a0fa961..283dac0f6d13 100644
--- a/tools/lib/bpf/libbpf.h
+++ b/tools/lib/bpf/libbpf.h
@@ -240,6 +240,7 @@ LIBBPF_API int bpf_program__set_sched_cls(struct bpf_program *prog);
 LIBBPF_API int bpf_program__set_sched_act(struct bpf_program *prog);
 LIBBPF_API int bpf_program__set_xdp(struct bpf_program *prog);
 LIBBPF_API int bpf_program__set_perf_event(struct bpf_program *prog);
+LIBBPF_API int bpf_program__set_inet_lookup(struct bpf_program *prog);
 LIBBPF_API void bpf_program__set_type(struct bpf_program *prog,
 				      enum bpf_prog_type type);
 LIBBPF_API void
@@ -254,6 +255,7 @@ LIBBPF_API bool bpf_program__is_sched_cls(struct bpf_program *prog);
 LIBBPF_API bool bpf_program__is_sched_act(struct bpf_program *prog);
 LIBBPF_API bool bpf_program__is_xdp(struct bpf_program *prog);
 LIBBPF_API bool bpf_program__is_perf_event(struct bpf_program *prog);
+LIBBPF_API bool bpf_program__is_inet_lookup(struct bpf_program *prog);
 
 /*
  * No need for __attribute__((packed)), all members of 'bpf_map_def'
diff --git a/tools/lib/bpf/libbpf.map b/tools/lib/bpf/libbpf.map
index 2c6d835620d2..e55d8e5d6fd4 100644
--- a/tools/lib/bpf/libbpf.map
+++ b/tools/lib/bpf/libbpf.map
@@ -67,6 +67,7 @@ LIBBPF_0.0.1 {
 		bpf_prog_test_run;
 		bpf_prog_test_run_xattr;
 		bpf_program__fd;
+		bpf_program__is_inet_lookup;
 		bpf_program__is_kprobe;
 		bpf_program__is_perf_event;
 		bpf_program__is_raw_tracepoint;
@@ -84,6 +85,7 @@ LIBBPF_0.0.1 {
 		bpf_program__priv;
 		bpf_program__set_expected_attach_type;
 		bpf_program__set_ifindex;
+		bpf_program__set_inet_lookup;
 		bpf_program__set_kprobe;
 		bpf_program__set_perf_event;
 		bpf_program__set_prep;
diff --git a/tools/lib/bpf/libbpf_probes.c b/tools/lib/bpf/libbpf_probes.c
index 5e2aa83f637a..5094f32d33a7 100644
--- a/tools/lib/bpf/libbpf_probes.c
+++ b/tools/lib/bpf/libbpf_probes.c
@@ -101,6 +101,7 @@ probe_load(enum bpf_prog_type prog_type, const struct bpf_insn *insns,
 	case BPF_PROG_TYPE_SK_REUSEPORT:
 	case BPF_PROG_TYPE_FLOW_DISSECTOR:
 	case BPF_PROG_TYPE_CGROUP_SYSCTL:
+	case BPF_PROG_TYPE_INET_LOOKUP:
 	default:
 		break;
 	}
-- 
2.20.1