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libbpf: add support for passing classid for tc attached programs

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Signed-off-by: Felix Fietkau <nbd@nbd.name>
This commit is contained in:
Felix Fietkau
2025-07-31 17:30:58 +02:00
parent e15d5cf752
commit 9ec4060962
1 changed files with 54 additions and 0 deletions
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54
package/libs/libbpf/patches/100-bpf_tc_classid.patch Normal file
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@@ -0,0 +1,54 @@
--- a/src/libbpf.h
+++ b/src/libbpf.h
@@ -1291,9 +1291,10 @@ struct bpf_tc_opts {
__u32 prog_id;
__u32 handle;
__u32 priority;
+ __u32 classid;
size_t :0;
};
-#define bpf_tc_opts__last_field priority
+#define bpf_tc_opts__last_field classid
LIBBPF_API int bpf_tc_hook_create(struct bpf_tc_hook *hook);
LIBBPF_API int bpf_tc_hook_destroy(struct bpf_tc_hook *hook);
--- a/src/netlink.c
+++ b/src/netlink.c
@@ -673,6 +673,8 @@ static int __get_tc_info(void *cookie, s
OPTS_SET(info->opts, prog_id, libbpf_nla_getattr_u32(tbb[TCA_BPF_ID]));
OPTS_SET(info->opts, handle, tc->tcm_handle);
OPTS_SET(info->opts, priority, TC_H_MAJ(tc->tcm_info) >> 16);
+ if (tbb[TCA_BPF_CLASSID])
+ OPTS_SET(info->opts, classid, libbpf_nla_getattr_u32(tbb[TCA_BPF_CLASSID]));
info->processed = true;
return unicast ? NL_NEXT : NL_DONE;
@@ -717,7 +719,7 @@ static int tc_add_fd_and_name(struct lib
int bpf_tc_attach(const struct bpf_tc_hook *hook, struct bpf_tc_opts *opts)
{
- __u32 protocol, bpf_flags, handle, priority, parent, prog_id, flags;
+ __u32 protocol, bpf_flags, handle, priority, parent, prog_id, flags, classid;
int ret, ifindex, attach_point, prog_fd;
struct bpf_cb_ctx info = {};
struct libbpf_nla_req req;
@@ -737,6 +739,7 @@ int bpf_tc_attach(const struct bpf_tc_ho
prog_fd = OPTS_GET(opts, prog_fd, 0);
prog_id = OPTS_GET(opts, prog_id, 0);
flags = OPTS_GET(opts, flags, 0);
+ classid = OPTS_GET(opts, classid, 0);
if (ifindex <= 0 || !prog_fd || prog_id)
return libbpf_err(-EINVAL);
@@ -776,6 +779,11 @@ int bpf_tc_attach(const struct bpf_tc_ho
ret = nlattr_add(&req, TCA_BPF_FLAGS, &bpf_flags, sizeof(bpf_flags));
if (ret < 0)
return libbpf_err(ret);
+ if (classid) {
+ ret = nlattr_add(&req, TCA_BPF_CLASSID, &classid, sizeof(classid));
+ if (ret < 0)
+ return libbpf_err(ret);
+ }
nlattr_end_nested(&req, nla);
info.opts = opts;