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-rw-r--r--kernel/bpf/offload.c112
-rw-r--r--kernel/bpf/syscall.c7
-rw-r--r--kernel/bpf/verifier.c5
3 files changed, 92 insertions, 32 deletions
diff --git a/kernel/bpf/offload.c b/kernel/bpf/offload.c
index 3e173c694bbb..e87cab2ed710 100644
--- a/kernel/bpf/offload.c
+++ b/kernel/bpf/offload.c
@@ -187,43 +187,24 @@ static void __bpf_offload_dev_netdev_unregister(struct bpf_offload_dev *offdev,
kfree(ondev);
}
-int bpf_prog_dev_bound_init(struct bpf_prog *prog, union bpf_attr *attr)
+static int __bpf_prog_dev_bound_init(struct bpf_prog *prog, struct net_device *netdev)
{
struct bpf_offload_netdev *ondev;
struct bpf_prog_offload *offload;
int err;
- if (attr->prog_type != BPF_PROG_TYPE_SCHED_CLS &&
- attr->prog_type != BPF_PROG_TYPE_XDP)
- return -EINVAL;
-
- if (attr->prog_flags & ~BPF_F_XDP_DEV_BOUND_ONLY)
- return -EINVAL;
-
- if (attr->prog_type == BPF_PROG_TYPE_SCHED_CLS &&
- attr->prog_flags & BPF_F_XDP_DEV_BOUND_ONLY)
- return -EINVAL;
-
offload = kzalloc(sizeof(*offload), GFP_USER);
if (!offload)
return -ENOMEM;
offload->prog = prog;
+ offload->netdev = netdev;
- offload->netdev = dev_get_by_index(current->nsproxy->net_ns,
- attr->prog_ifindex);
- err = bpf_dev_offload_check(offload->netdev);
- if (err)
- goto err_maybe_put;
-
- prog->aux->offload_requested = !(attr->prog_flags & BPF_F_XDP_DEV_BOUND_ONLY);
-
- down_write(&bpf_devs_lock);
ondev = bpf_offload_find_netdev(offload->netdev);
if (!ondev) {
if (bpf_prog_is_offloaded(prog->aux)) {
err = -EINVAL;
- goto err_unlock;
+ goto err_free;
}
/* When only binding to the device, explicitly
@@ -231,25 +212,80 @@ int bpf_prog_dev_bound_init(struct bpf_prog *prog, union bpf_attr *attr)
*/
err = __bpf_offload_dev_netdev_register(NULL, offload->netdev);
if (err)
- goto err_unlock;
+ goto err_free;
ondev = bpf_offload_find_netdev(offload->netdev);
}
offload->offdev = ondev->offdev;
prog->aux->offload = offload;
list_add_tail(&offload->offloads, &ondev->progs);
- dev_put(offload->netdev);
- up_write(&bpf_devs_lock);
return 0;
-err_unlock:
- up_write(&bpf_devs_lock);
-err_maybe_put:
- if (offload->netdev)
- dev_put(offload->netdev);
+err_free:
kfree(offload);
return err;
}
+int bpf_prog_dev_bound_init(struct bpf_prog *prog, union bpf_attr *attr)
+{
+ struct net_device *netdev;
+ int err;
+
+ if (attr->prog_type != BPF_PROG_TYPE_SCHED_CLS &&
+ attr->prog_type != BPF_PROG_TYPE_XDP)
+ return -EINVAL;
+
+ if (attr->prog_flags & ~BPF_F_XDP_DEV_BOUND_ONLY)
+ return -EINVAL;
+
+ if (attr->prog_type == BPF_PROG_TYPE_SCHED_CLS &&
+ attr->prog_flags & BPF_F_XDP_DEV_BOUND_ONLY)
+ return -EINVAL;
+
+ netdev = dev_get_by_index(current->nsproxy->net_ns, attr->prog_ifindex);
+ if (!netdev)
+ return -EINVAL;
+
+ err = bpf_dev_offload_check(netdev);
+ if (err)
+ goto out;
+
+ prog->aux->offload_requested = !(attr->prog_flags & BPF_F_XDP_DEV_BOUND_ONLY);
+
+ down_write(&bpf_devs_lock);
+ err = __bpf_prog_dev_bound_init(prog, netdev);
+ up_write(&bpf_devs_lock);
+
+out:
+ dev_put(netdev);
+ return err;
+}
+
+int bpf_prog_dev_bound_inherit(struct bpf_prog *new_prog, struct bpf_prog *old_prog)
+{
+ int err;
+
+ if (!bpf_prog_is_dev_bound(old_prog->aux))
+ return 0;
+
+ if (bpf_prog_is_offloaded(old_prog->aux))
+ return -EINVAL;
+
+ new_prog->aux->dev_bound = old_prog->aux->dev_bound;
+ new_prog->aux->offload_requested = old_prog->aux->offload_requested;
+
+ down_write(&bpf_devs_lock);
+ if (!old_prog->aux->offload) {
+ err = -EINVAL;
+ goto out;
+ }
+
+ err = __bpf_prog_dev_bound_init(new_prog, old_prog->aux->offload->netdev);
+
+out:
+ up_write(&bpf_devs_lock);
+ return err;
+}
+
int bpf_prog_offload_verifier_prep(struct bpf_prog *prog)
{
struct bpf_prog_offload *offload;
@@ -675,6 +711,22 @@ bool bpf_offload_dev_match(struct bpf_prog *prog, struct net_device *netdev)
}
EXPORT_SYMBOL_GPL(bpf_offload_dev_match);
+bool bpf_prog_dev_bound_match(const struct bpf_prog *lhs, const struct bpf_prog *rhs)
+{
+ bool ret;
+
+ if (bpf_prog_is_offloaded(lhs->aux) != bpf_prog_is_offloaded(rhs->aux))
+ return false;
+
+ down_read(&bpf_devs_lock);
+ ret = lhs->aux->offload && rhs->aux->offload &&
+ lhs->aux->offload->netdev &&
+ lhs->aux->offload->netdev == rhs->aux->offload->netdev;
+ up_read(&bpf_devs_lock);
+
+ return ret;
+}
+
bool bpf_offload_prog_map_match(struct bpf_prog *prog, struct bpf_map *map)
{
struct bpf_offloaded_map *offmap;
diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
index fdf4ff3d5a7f..d5ffa7a01dfb 100644
--- a/kernel/bpf/syscall.c
+++ b/kernel/bpf/syscall.c
@@ -2605,6 +2605,13 @@ static int bpf_prog_load(union bpf_attr *attr, bpfptr_t uattr)
goto free_prog_sec;
}
+ if (type == BPF_PROG_TYPE_EXT && dst_prog &&
+ bpf_prog_is_dev_bound(dst_prog->aux)) {
+ err = bpf_prog_dev_bound_inherit(prog, dst_prog);
+ if (err)
+ goto free_prog_sec;
+ }
+
/* find program type: socket_filter vs tracing_filter */
err = find_prog_type(type, prog);
if (err < 0)
diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index 9009395206f8..800488289297 100644
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -16813,8 +16813,9 @@ int bpf_check_attach_target(struct bpf_verifier_log *log,
if (tgt_prog) {
struct bpf_prog_aux *aux = tgt_prog->aux;
- if (bpf_prog_is_dev_bound(tgt_prog->aux)) {
- bpf_log(log, "Replacing device-bound programs not supported\n");
+ if (bpf_prog_is_dev_bound(prog->aux) &&
+ !bpf_prog_dev_bound_match(prog, tgt_prog)) {
+ bpf_log(log, "Target program bound device mismatch");
return -EINVAL;
}