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authorJakub Sitnicki <jakub@cloudflare.com>2020-05-31 10:28:40 +0200
committerAlexei Starovoitov <ast@kernel.org>2020-06-01 15:21:03 -0700
commitd60d81acc2c180e33244857e35ef60072573b000 (patch)
tree11247584ab1f2753c51c2a968a49c7933ff73c7b /tools
parent0c047ecbb7bab4c1d2136f5f04bb47a66a9a12b8 (diff)
libbpf: Add support for bpf_link-based netns attachment
Add bpf_program__attach_nets(), which uses LINK_CREATE subcommand to create an FD-based kernel bpf_link, for attach types tied to network namespace, that is BPF_FLOW_DISSECTOR for the moment. Signed-off-by: Jakub Sitnicki <jakub@cloudflare.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/20200531082846.2117903-7-jakub@cloudflare.com
Diffstat (limited to 'tools')
-rw-r--r--tools/lib/bpf/libbpf.c23
-rw-r--r--tools/lib/bpf/libbpf.h2
-rw-r--r--tools/lib/bpf/libbpf.map1
3 files changed, 21 insertions, 5 deletions
diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index 85d4f1c5fc52..7f01be2b88b8 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -7896,8 +7896,9 @@ static struct bpf_link *attach_iter(const struct bpf_sec_def *sec,
return bpf_program__attach_iter(prog, NULL);
}
-struct bpf_link *
-bpf_program__attach_cgroup(struct bpf_program *prog, int cgroup_fd)
+static struct bpf_link *
+bpf_program__attach_fd(struct bpf_program *prog, int target_fd,
+ const char *target_name)
{
enum bpf_attach_type attach_type;
char errmsg[STRERR_BUFSIZE];
@@ -7917,12 +7918,12 @@ bpf_program__attach_cgroup(struct bpf_program *prog, int cgroup_fd)
link->detach = &bpf_link__detach_fd;
attach_type = bpf_program__get_expected_attach_type(prog);
- link_fd = bpf_link_create(prog_fd, cgroup_fd, attach_type, NULL);
+ link_fd = bpf_link_create(prog_fd, target_fd, attach_type, NULL);
if (link_fd < 0) {
link_fd = -errno;
free(link);
- pr_warn("program '%s': failed to attach to cgroup: %s\n",
- bpf_program__title(prog, false),
+ pr_warn("program '%s': failed to attach to %s: %s\n",
+ bpf_program__title(prog, false), target_name,
libbpf_strerror_r(link_fd, errmsg, sizeof(errmsg)));
return ERR_PTR(link_fd);
}
@@ -7931,6 +7932,18 @@ bpf_program__attach_cgroup(struct bpf_program *prog, int cgroup_fd)
}
struct bpf_link *
+bpf_program__attach_cgroup(struct bpf_program *prog, int cgroup_fd)
+{
+ return bpf_program__attach_fd(prog, cgroup_fd, "cgroup");
+}
+
+struct bpf_link *
+bpf_program__attach_netns(struct bpf_program *prog, int netns_fd)
+{
+ return bpf_program__attach_fd(prog, netns_fd, "netns");
+}
+
+struct bpf_link *
bpf_program__attach_iter(struct bpf_program *prog,
const struct bpf_iter_attach_opts *opts)
{
diff --git a/tools/lib/bpf/libbpf.h b/tools/lib/bpf/libbpf.h
index 8528a02d5af8..334437af3014 100644
--- a/tools/lib/bpf/libbpf.h
+++ b/tools/lib/bpf/libbpf.h
@@ -253,6 +253,8 @@ LIBBPF_API struct bpf_link *
bpf_program__attach_lsm(struct bpf_program *prog);
LIBBPF_API struct bpf_link *
bpf_program__attach_cgroup(struct bpf_program *prog, int cgroup_fd);
+LIBBPF_API struct bpf_link *
+bpf_program__attach_netns(struct bpf_program *prog, int netns_fd);
struct bpf_map;
diff --git a/tools/lib/bpf/libbpf.map b/tools/lib/bpf/libbpf.map
index c18860200abb..f732c77b7ed0 100644
--- a/tools/lib/bpf/libbpf.map
+++ b/tools/lib/bpf/libbpf.map
@@ -262,6 +262,7 @@ LIBBPF_0.0.9 {
bpf_link_get_fd_by_id;
bpf_link_get_next_id;
bpf_program__attach_iter;
+ bpf_program__attach_netns;
perf_buffer__consume;
ring_buffer__add;
ring_buffer__consume;