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![Yonghong Song](/assets/img/avatar_default.png)
With latest clang18, I hit test_progs failures for the following test: #13/2 bpf_cookie/multi_kprobe_link_api:FAIL #13/3 bpf_cookie/multi_kprobe_attach_api:FAIL #13 bpf_cookie:FAIL #75 fentry_fexit:FAIL #76/1 fentry_test/fentry:FAIL #76 fentry_test:FAIL #80/1 fexit_test/fexit:FAIL #80 fexit_test:FAIL #110/1 kprobe_multi_test/skel_api:FAIL #110/2 kprobe_multi_test/link_api_addrs:FAIL #110/3 kprobe_multi_test/link_api_syms:FAIL #110/4 kprobe_multi_test/attach_api_pattern:FAIL #110/5 kprobe_multi_test/attach_api_addrs:FAIL #110/6 kprobe_multi_test/attach_api_syms:FAIL #110 kprobe_multi_test:FAIL For example, for #13/2, the error messages are: [...] kprobe_multi_test_run:FAIL:kprobe_test7_result unexpected kprobe_test7_result: actual 0 != expected 1 [...] kprobe_multi_test_run:FAIL:kretprobe_test7_result unexpected kretprobe_test7_result: actual 0 != expected 1 clang17 does not have this issue. Further investigation shows that kernel func bpf_fentry_test7(), used in the above tests, is inlined by the compiler although it is marked as noinline. int noinline bpf_fentry_test7(struct bpf_fentry_test_t *arg) { return (long)arg; } It is known that for simple functions like the above (e.g. just returning a constant or an input argument), the clang compiler may still do inlining for a noinline function. Adding 'asm volatile ("")' in the beginning of the bpf_fentry_test7() can prevent inlining. Signed-off-by: Yonghong Song <yonghong.song@linux.dev> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Tested-by: Eduard Zingerman <eddyz87@gmail.com> Link: https://lore.kernel.org/bpf/20230826200843.2210074-1-yonghong.song@linux.dev
1701 lines
39 KiB
C
1701 lines
39 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/* Copyright (c) 2017 Facebook
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*/
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#include <linux/bpf.h>
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#include <linux/btf.h>
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#include <linux/btf_ids.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/vmalloc.h>
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#include <linux/etherdevice.h>
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#include <linux/filter.h>
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#include <linux/rcupdate_trace.h>
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#include <linux/sched/signal.h>
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#include <net/bpf_sk_storage.h>
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#include <net/sock.h>
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#include <net/tcp.h>
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#include <net/net_namespace.h>
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#include <net/page_pool/helpers.h>
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#include <linux/error-injection.h>
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#include <linux/smp.h>
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#include <linux/sock_diag.h>
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#include <linux/netfilter.h>
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#include <net/netdev_rx_queue.h>
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#include <net/xdp.h>
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#include <net/netfilter/nf_bpf_link.h>
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#define CREATE_TRACE_POINTS
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#include <trace/events/bpf_test_run.h>
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struct bpf_test_timer {
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enum { NO_PREEMPT, NO_MIGRATE } mode;
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u32 i;
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u64 time_start, time_spent;
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};
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static void bpf_test_timer_enter(struct bpf_test_timer *t)
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__acquires(rcu)
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{
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rcu_read_lock();
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if (t->mode == NO_PREEMPT)
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preempt_disable();
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else
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migrate_disable();
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t->time_start = ktime_get_ns();
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}
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static void bpf_test_timer_leave(struct bpf_test_timer *t)
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__releases(rcu)
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{
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t->time_start = 0;
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if (t->mode == NO_PREEMPT)
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preempt_enable();
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else
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migrate_enable();
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rcu_read_unlock();
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}
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static bool bpf_test_timer_continue(struct bpf_test_timer *t, int iterations,
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u32 repeat, int *err, u32 *duration)
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__must_hold(rcu)
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{
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t->i += iterations;
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if (t->i >= repeat) {
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/* We're done. */
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t->time_spent += ktime_get_ns() - t->time_start;
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do_div(t->time_spent, t->i);
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*duration = t->time_spent > U32_MAX ? U32_MAX : (u32)t->time_spent;
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*err = 0;
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goto reset;
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}
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if (signal_pending(current)) {
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/* During iteration: we've been cancelled, abort. */
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*err = -EINTR;
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goto reset;
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}
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if (need_resched()) {
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/* During iteration: we need to reschedule between runs. */
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t->time_spent += ktime_get_ns() - t->time_start;
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bpf_test_timer_leave(t);
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cond_resched();
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bpf_test_timer_enter(t);
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}
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/* Do another round. */
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return true;
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reset:
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t->i = 0;
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return false;
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}
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/* We put this struct at the head of each page with a context and frame
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* initialised when the page is allocated, so we don't have to do this on each
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* repetition of the test run.
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*/
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struct xdp_page_head {
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struct xdp_buff orig_ctx;
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struct xdp_buff ctx;
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union {
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/* ::data_hard_start starts here */
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DECLARE_FLEX_ARRAY(struct xdp_frame, frame);
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DECLARE_FLEX_ARRAY(u8, data);
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};
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};
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struct xdp_test_data {
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struct xdp_buff *orig_ctx;
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struct xdp_rxq_info rxq;
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struct net_device *dev;
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struct page_pool *pp;
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struct xdp_frame **frames;
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struct sk_buff **skbs;
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struct xdp_mem_info mem;
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u32 batch_size;
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u32 frame_cnt;
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};
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/* tools/testing/selftests/bpf/prog_tests/xdp_do_redirect.c:%MAX_PKT_SIZE
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* must be updated accordingly this gets changed, otherwise BPF selftests
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* will fail.
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*/
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#define TEST_XDP_FRAME_SIZE (PAGE_SIZE - sizeof(struct xdp_page_head))
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#define TEST_XDP_MAX_BATCH 256
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static void xdp_test_run_init_page(struct page *page, void *arg)
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{
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struct xdp_page_head *head = phys_to_virt(page_to_phys(page));
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struct xdp_buff *new_ctx, *orig_ctx;
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u32 headroom = XDP_PACKET_HEADROOM;
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struct xdp_test_data *xdp = arg;
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size_t frm_len, meta_len;
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struct xdp_frame *frm;
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void *data;
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orig_ctx = xdp->orig_ctx;
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frm_len = orig_ctx->data_end - orig_ctx->data_meta;
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meta_len = orig_ctx->data - orig_ctx->data_meta;
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headroom -= meta_len;
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new_ctx = &head->ctx;
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frm = head->frame;
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data = head->data;
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memcpy(data + headroom, orig_ctx->data_meta, frm_len);
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xdp_init_buff(new_ctx, TEST_XDP_FRAME_SIZE, &xdp->rxq);
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xdp_prepare_buff(new_ctx, data, headroom, frm_len, true);
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new_ctx->data = new_ctx->data_meta + meta_len;
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xdp_update_frame_from_buff(new_ctx, frm);
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frm->mem = new_ctx->rxq->mem;
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memcpy(&head->orig_ctx, new_ctx, sizeof(head->orig_ctx));
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}
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static int xdp_test_run_setup(struct xdp_test_data *xdp, struct xdp_buff *orig_ctx)
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{
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struct page_pool *pp;
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int err = -ENOMEM;
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struct page_pool_params pp_params = {
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.order = 0,
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.flags = 0,
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.pool_size = xdp->batch_size,
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.nid = NUMA_NO_NODE,
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.init_callback = xdp_test_run_init_page,
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.init_arg = xdp,
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};
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xdp->frames = kvmalloc_array(xdp->batch_size, sizeof(void *), GFP_KERNEL);
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if (!xdp->frames)
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return -ENOMEM;
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xdp->skbs = kvmalloc_array(xdp->batch_size, sizeof(void *), GFP_KERNEL);
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if (!xdp->skbs)
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goto err_skbs;
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pp = page_pool_create(&pp_params);
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if (IS_ERR(pp)) {
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err = PTR_ERR(pp);
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goto err_pp;
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}
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/* will copy 'mem.id' into pp->xdp_mem_id */
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err = xdp_reg_mem_model(&xdp->mem, MEM_TYPE_PAGE_POOL, pp);
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if (err)
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goto err_mmodel;
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xdp->pp = pp;
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/* We create a 'fake' RXQ referencing the original dev, but with an
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* xdp_mem_info pointing to our page_pool
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*/
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xdp_rxq_info_reg(&xdp->rxq, orig_ctx->rxq->dev, 0, 0);
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xdp->rxq.mem.type = MEM_TYPE_PAGE_POOL;
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xdp->rxq.mem.id = pp->xdp_mem_id;
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xdp->dev = orig_ctx->rxq->dev;
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xdp->orig_ctx = orig_ctx;
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return 0;
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err_mmodel:
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page_pool_destroy(pp);
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err_pp:
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kvfree(xdp->skbs);
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err_skbs:
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kvfree(xdp->frames);
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return err;
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}
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static void xdp_test_run_teardown(struct xdp_test_data *xdp)
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{
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xdp_unreg_mem_model(&xdp->mem);
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page_pool_destroy(xdp->pp);
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kfree(xdp->frames);
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kfree(xdp->skbs);
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}
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static bool frame_was_changed(const struct xdp_page_head *head)
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{
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/* xdp_scrub_frame() zeroes the data pointer, flags is the last field,
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* i.e. has the highest chances to be overwritten. If those two are
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* untouched, it's most likely safe to skip the context reset.
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*/
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return head->frame->data != head->orig_ctx.data ||
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head->frame->flags != head->orig_ctx.flags;
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}
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static bool ctx_was_changed(struct xdp_page_head *head)
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{
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return head->orig_ctx.data != head->ctx.data ||
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head->orig_ctx.data_meta != head->ctx.data_meta ||
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head->orig_ctx.data_end != head->ctx.data_end;
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}
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static void reset_ctx(struct xdp_page_head *head)
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{
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if (likely(!frame_was_changed(head) && !ctx_was_changed(head)))
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return;
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head->ctx.data = head->orig_ctx.data;
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head->ctx.data_meta = head->orig_ctx.data_meta;
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head->ctx.data_end = head->orig_ctx.data_end;
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xdp_update_frame_from_buff(&head->ctx, head->frame);
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}
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static int xdp_recv_frames(struct xdp_frame **frames, int nframes,
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struct sk_buff **skbs,
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struct net_device *dev)
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{
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gfp_t gfp = __GFP_ZERO | GFP_ATOMIC;
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int i, n;
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LIST_HEAD(list);
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n = kmem_cache_alloc_bulk(skbuff_cache, gfp, nframes, (void **)skbs);
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if (unlikely(n == 0)) {
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for (i = 0; i < nframes; i++)
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xdp_return_frame(frames[i]);
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return -ENOMEM;
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}
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for (i = 0; i < nframes; i++) {
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struct xdp_frame *xdpf = frames[i];
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struct sk_buff *skb = skbs[i];
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skb = __xdp_build_skb_from_frame(xdpf, skb, dev);
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if (!skb) {
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xdp_return_frame(xdpf);
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continue;
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}
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list_add_tail(&skb->list, &list);
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}
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netif_receive_skb_list(&list);
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return 0;
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}
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static int xdp_test_run_batch(struct xdp_test_data *xdp, struct bpf_prog *prog,
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u32 repeat)
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{
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struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info);
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int err = 0, act, ret, i, nframes = 0, batch_sz;
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struct xdp_frame **frames = xdp->frames;
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struct xdp_page_head *head;
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struct xdp_frame *frm;
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bool redirect = false;
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struct xdp_buff *ctx;
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struct page *page;
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batch_sz = min_t(u32, repeat, xdp->batch_size);
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local_bh_disable();
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xdp_set_return_frame_no_direct();
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for (i = 0; i < batch_sz; i++) {
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page = page_pool_dev_alloc_pages(xdp->pp);
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if (!page) {
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err = -ENOMEM;
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goto out;
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}
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head = phys_to_virt(page_to_phys(page));
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reset_ctx(head);
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ctx = &head->ctx;
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frm = head->frame;
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xdp->frame_cnt++;
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act = bpf_prog_run_xdp(prog, ctx);
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/* if program changed pkt bounds we need to update the xdp_frame */
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if (unlikely(ctx_was_changed(head))) {
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ret = xdp_update_frame_from_buff(ctx, frm);
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if (ret) {
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xdp_return_buff(ctx);
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continue;
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}
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}
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switch (act) {
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case XDP_TX:
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/* we can't do a real XDP_TX since we're not in the
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* driver, so turn it into a REDIRECT back to the same
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* index
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*/
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ri->tgt_index = xdp->dev->ifindex;
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ri->map_id = INT_MAX;
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ri->map_type = BPF_MAP_TYPE_UNSPEC;
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fallthrough;
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case XDP_REDIRECT:
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redirect = true;
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ret = xdp_do_redirect_frame(xdp->dev, ctx, frm, prog);
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if (ret)
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xdp_return_buff(ctx);
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break;
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case XDP_PASS:
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frames[nframes++] = frm;
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break;
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default:
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bpf_warn_invalid_xdp_action(NULL, prog, act);
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fallthrough;
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case XDP_DROP:
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xdp_return_buff(ctx);
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break;
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}
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}
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out:
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if (redirect)
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xdp_do_flush();
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if (nframes) {
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ret = xdp_recv_frames(frames, nframes, xdp->skbs, xdp->dev);
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if (ret)
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err = ret;
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}
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xdp_clear_return_frame_no_direct();
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local_bh_enable();
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return err;
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}
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static int bpf_test_run_xdp_live(struct bpf_prog *prog, struct xdp_buff *ctx,
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u32 repeat, u32 batch_size, u32 *time)
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{
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struct xdp_test_data xdp = { .batch_size = batch_size };
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struct bpf_test_timer t = { .mode = NO_MIGRATE };
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int ret;
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if (!repeat)
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repeat = 1;
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ret = xdp_test_run_setup(&xdp, ctx);
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if (ret)
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return ret;
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bpf_test_timer_enter(&t);
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do {
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xdp.frame_cnt = 0;
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ret = xdp_test_run_batch(&xdp, prog, repeat - t.i);
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if (unlikely(ret < 0))
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break;
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} while (bpf_test_timer_continue(&t, xdp.frame_cnt, repeat, &ret, time));
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bpf_test_timer_leave(&t);
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xdp_test_run_teardown(&xdp);
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return ret;
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}
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static int bpf_test_run(struct bpf_prog *prog, void *ctx, u32 repeat,
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u32 *retval, u32 *time, bool xdp)
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{
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struct bpf_prog_array_item item = {.prog = prog};
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struct bpf_run_ctx *old_ctx;
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struct bpf_cg_run_ctx run_ctx;
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struct bpf_test_timer t = { NO_MIGRATE };
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enum bpf_cgroup_storage_type stype;
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int ret;
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for_each_cgroup_storage_type(stype) {
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item.cgroup_storage[stype] = bpf_cgroup_storage_alloc(prog, stype);
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if (IS_ERR(item.cgroup_storage[stype])) {
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item.cgroup_storage[stype] = NULL;
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for_each_cgroup_storage_type(stype)
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bpf_cgroup_storage_free(item.cgroup_storage[stype]);
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return -ENOMEM;
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}
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}
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if (!repeat)
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repeat = 1;
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bpf_test_timer_enter(&t);
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old_ctx = bpf_set_run_ctx(&run_ctx.run_ctx);
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do {
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run_ctx.prog_item = &item;
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local_bh_disable();
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if (xdp)
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*retval = bpf_prog_run_xdp(prog, ctx);
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else
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*retval = bpf_prog_run(prog, ctx);
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local_bh_enable();
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} while (bpf_test_timer_continue(&t, 1, repeat, &ret, time));
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bpf_reset_run_ctx(old_ctx);
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bpf_test_timer_leave(&t);
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for_each_cgroup_storage_type(stype)
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bpf_cgroup_storage_free(item.cgroup_storage[stype]);
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return ret;
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}
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|
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static int bpf_test_finish(const union bpf_attr *kattr,
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union bpf_attr __user *uattr, const void *data,
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struct skb_shared_info *sinfo, u32 size,
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u32 retval, u32 duration)
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{
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void __user *data_out = u64_to_user_ptr(kattr->test.data_out);
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int err = -EFAULT;
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u32 copy_size = size;
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|
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/* Clamp copy if the user has provided a size hint, but copy the full
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* buffer if not to retain old behaviour.
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*/
|
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if (kattr->test.data_size_out &&
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copy_size > kattr->test.data_size_out) {
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copy_size = kattr->test.data_size_out;
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err = -ENOSPC;
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}
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|
|
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if (data_out) {
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int len = sinfo ? copy_size - sinfo->xdp_frags_size : copy_size;
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|
|
if (len < 0) {
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err = -ENOSPC;
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goto out;
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|
}
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|
|
if (copy_to_user(data_out, data, len))
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goto out;
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|
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if (sinfo) {
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int i, offset = len;
|
|
u32 data_len;
|
|
|
|
for (i = 0; i < sinfo->nr_frags; i++) {
|
|
skb_frag_t *frag = &sinfo->frags[i];
|
|
|
|
if (offset >= copy_size) {
|
|
err = -ENOSPC;
|
|
break;
|
|
}
|
|
|
|
data_len = min_t(u32, copy_size - offset,
|
|
skb_frag_size(frag));
|
|
|
|
if (copy_to_user(data_out + offset,
|
|
skb_frag_address(frag),
|
|
data_len))
|
|
goto out;
|
|
|
|
offset += data_len;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (copy_to_user(&uattr->test.data_size_out, &size, sizeof(size)))
|
|
goto out;
|
|
if (copy_to_user(&uattr->test.retval, &retval, sizeof(retval)))
|
|
goto out;
|
|
if (copy_to_user(&uattr->test.duration, &duration, sizeof(duration)))
|
|
goto out;
|
|
if (err != -ENOSPC)
|
|
err = 0;
|
|
out:
|
|
trace_bpf_test_finish(&err);
|
|
return err;
|
|
}
|
|
|
|
/* Integer types of various sizes and pointer combinations cover variety of
|
|
* architecture dependent calling conventions. 7+ can be supported in the
|
|
* future.
|
|
*/
|
|
__diag_push();
|
|
__diag_ignore_all("-Wmissing-prototypes",
|
|
"Global functions as their definitions will be in vmlinux BTF");
|
|
__bpf_kfunc int bpf_fentry_test1(int a)
|
|
{
|
|
return a + 1;
|
|
}
|
|
EXPORT_SYMBOL_GPL(bpf_fentry_test1);
|
|
|
|
int noinline bpf_fentry_test2(int a, u64 b)
|
|
{
|
|
return a + b;
|
|
}
|
|
|
|
int noinline bpf_fentry_test3(char a, int b, u64 c)
|
|
{
|
|
return a + b + c;
|
|
}
|
|
|
|
int noinline bpf_fentry_test4(void *a, char b, int c, u64 d)
|
|
{
|
|
return (long)a + b + c + d;
|
|
}
|
|
|
|
int noinline bpf_fentry_test5(u64 a, void *b, short c, int d, u64 e)
|
|
{
|
|
return a + (long)b + c + d + e;
|
|
}
|
|
|
|
int noinline bpf_fentry_test6(u64 a, void *b, short c, int d, void *e, u64 f)
|
|
{
|
|
return a + (long)b + c + d + (long)e + f;
|
|
}
|
|
|
|
struct bpf_fentry_test_t {
|
|
struct bpf_fentry_test_t *a;
|
|
};
|
|
|
|
int noinline bpf_fentry_test7(struct bpf_fentry_test_t *arg)
|
|
{
|
|
asm volatile ("");
|
|
return (long)arg;
|
|
}
|
|
|
|
int noinline bpf_fentry_test8(struct bpf_fentry_test_t *arg)
|
|
{
|
|
return (long)arg->a;
|
|
}
|
|
|
|
__bpf_kfunc u32 bpf_fentry_test9(u32 *a)
|
|
{
|
|
return *a;
|
|
}
|
|
|
|
void noinline bpf_fentry_test_sinfo(struct skb_shared_info *sinfo)
|
|
{
|
|
}
|
|
|
|
__bpf_kfunc int bpf_modify_return_test(int a, int *b)
|
|
{
|
|
*b += 1;
|
|
return a + *b;
|
|
}
|
|
|
|
__bpf_kfunc int bpf_modify_return_test2(int a, int *b, short c, int d,
|
|
void *e, char f, int g)
|
|
{
|
|
*b += 1;
|
|
return a + *b + c + d + (long)e + f + g;
|
|
}
|
|
|
|
int noinline bpf_fentry_shadow_test(int a)
|
|
{
|
|
return a + 1;
|
|
}
|
|
|
|
struct prog_test_member1 {
|
|
int a;
|
|
};
|
|
|
|
struct prog_test_member {
|
|
struct prog_test_member1 m;
|
|
int c;
|
|
};
|
|
|
|
struct prog_test_ref_kfunc {
|
|
int a;
|
|
int b;
|
|
struct prog_test_member memb;
|
|
struct prog_test_ref_kfunc *next;
|
|
refcount_t cnt;
|
|
};
|
|
|
|
__bpf_kfunc void bpf_kfunc_call_test_release(struct prog_test_ref_kfunc *p)
|
|
{
|
|
refcount_dec(&p->cnt);
|
|
}
|
|
|
|
__bpf_kfunc void bpf_kfunc_call_memb_release(struct prog_test_member *p)
|
|
{
|
|
}
|
|
|
|
__diag_pop();
|
|
|
|
BTF_SET8_START(bpf_test_modify_return_ids)
|
|
BTF_ID_FLAGS(func, bpf_modify_return_test)
|
|
BTF_ID_FLAGS(func, bpf_modify_return_test2)
|
|
BTF_ID_FLAGS(func, bpf_fentry_test1, KF_SLEEPABLE)
|
|
BTF_SET8_END(bpf_test_modify_return_ids)
|
|
|
|
static const struct btf_kfunc_id_set bpf_test_modify_return_set = {
|
|
.owner = THIS_MODULE,
|
|
.set = &bpf_test_modify_return_ids,
|
|
};
|
|
|
|
BTF_SET8_START(test_sk_check_kfunc_ids)
|
|
BTF_ID_FLAGS(func, bpf_kfunc_call_test_release, KF_RELEASE)
|
|
BTF_ID_FLAGS(func, bpf_kfunc_call_memb_release, KF_RELEASE)
|
|
BTF_SET8_END(test_sk_check_kfunc_ids)
|
|
|
|
static void *bpf_test_init(const union bpf_attr *kattr, u32 user_size,
|
|
u32 size, u32 headroom, u32 tailroom)
|
|
{
|
|
void __user *data_in = u64_to_user_ptr(kattr->test.data_in);
|
|
void *data;
|
|
|
|
if (size < ETH_HLEN || size > PAGE_SIZE - headroom - tailroom)
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
if (user_size > size)
|
|
return ERR_PTR(-EMSGSIZE);
|
|
|
|
size = SKB_DATA_ALIGN(size);
|
|
data = kzalloc(size + headroom + tailroom, GFP_USER);
|
|
if (!data)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
if (copy_from_user(data + headroom, data_in, user_size)) {
|
|
kfree(data);
|
|
return ERR_PTR(-EFAULT);
|
|
}
|
|
|
|
return data;
|
|
}
|
|
|
|
int bpf_prog_test_run_tracing(struct bpf_prog *prog,
|
|
const union bpf_attr *kattr,
|
|
union bpf_attr __user *uattr)
|
|
{
|
|
struct bpf_fentry_test_t arg = {};
|
|
u16 side_effect = 0, ret = 0;
|
|
int b = 2, err = -EFAULT;
|
|
u32 retval = 0;
|
|
|
|
if (kattr->test.flags || kattr->test.cpu || kattr->test.batch_size)
|
|
return -EINVAL;
|
|
|
|
switch (prog->expected_attach_type) {
|
|
case BPF_TRACE_FENTRY:
|
|
case BPF_TRACE_FEXIT:
|
|
if (bpf_fentry_test1(1) != 2 ||
|
|
bpf_fentry_test2(2, 3) != 5 ||
|
|
bpf_fentry_test3(4, 5, 6) != 15 ||
|
|
bpf_fentry_test4((void *)7, 8, 9, 10) != 34 ||
|
|
bpf_fentry_test5(11, (void *)12, 13, 14, 15) != 65 ||
|
|
bpf_fentry_test6(16, (void *)17, 18, 19, (void *)20, 21) != 111 ||
|
|
bpf_fentry_test7((struct bpf_fentry_test_t *)0) != 0 ||
|
|
bpf_fentry_test8(&arg) != 0 ||
|
|
bpf_fentry_test9(&retval) != 0)
|
|
goto out;
|
|
break;
|
|
case BPF_MODIFY_RETURN:
|
|
ret = bpf_modify_return_test(1, &b);
|
|
if (b != 2)
|
|
side_effect++;
|
|
b = 2;
|
|
ret += bpf_modify_return_test2(1, &b, 3, 4, (void *)5, 6, 7);
|
|
if (b != 2)
|
|
side_effect++;
|
|
break;
|
|
default:
|
|
goto out;
|
|
}
|
|
|
|
retval = ((u32)side_effect << 16) | ret;
|
|
if (copy_to_user(&uattr->test.retval, &retval, sizeof(retval)))
|
|
goto out;
|
|
|
|
err = 0;
|
|
out:
|
|
trace_bpf_test_finish(&err);
|
|
return err;
|
|
}
|
|
|
|
struct bpf_raw_tp_test_run_info {
|
|
struct bpf_prog *prog;
|
|
void *ctx;
|
|
u32 retval;
|
|
};
|
|
|
|
static void
|
|
__bpf_prog_test_run_raw_tp(void *data)
|
|
{
|
|
struct bpf_raw_tp_test_run_info *info = data;
|
|
|
|
rcu_read_lock();
|
|
info->retval = bpf_prog_run(info->prog, info->ctx);
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
int bpf_prog_test_run_raw_tp(struct bpf_prog *prog,
|
|
const union bpf_attr *kattr,
|
|
union bpf_attr __user *uattr)
|
|
{
|
|
void __user *ctx_in = u64_to_user_ptr(kattr->test.ctx_in);
|
|
__u32 ctx_size_in = kattr->test.ctx_size_in;
|
|
struct bpf_raw_tp_test_run_info info;
|
|
int cpu = kattr->test.cpu, err = 0;
|
|
int current_cpu;
|
|
|
|
/* doesn't support data_in/out, ctx_out, duration, or repeat */
|
|
if (kattr->test.data_in || kattr->test.data_out ||
|
|
kattr->test.ctx_out || kattr->test.duration ||
|
|
kattr->test.repeat || kattr->test.batch_size)
|
|
return -EINVAL;
|
|
|
|
if (ctx_size_in < prog->aux->max_ctx_offset ||
|
|
ctx_size_in > MAX_BPF_FUNC_ARGS * sizeof(u64))
|
|
return -EINVAL;
|
|
|
|
if ((kattr->test.flags & BPF_F_TEST_RUN_ON_CPU) == 0 && cpu != 0)
|
|
return -EINVAL;
|
|
|
|
if (ctx_size_in) {
|
|
info.ctx = memdup_user(ctx_in, ctx_size_in);
|
|
if (IS_ERR(info.ctx))
|
|
return PTR_ERR(info.ctx);
|
|
} else {
|
|
info.ctx = NULL;
|
|
}
|
|
|
|
info.prog = prog;
|
|
|
|
current_cpu = get_cpu();
|
|
if ((kattr->test.flags & BPF_F_TEST_RUN_ON_CPU) == 0 ||
|
|
cpu == current_cpu) {
|
|
__bpf_prog_test_run_raw_tp(&info);
|
|
} else if (cpu >= nr_cpu_ids || !cpu_online(cpu)) {
|
|
/* smp_call_function_single() also checks cpu_online()
|
|
* after csd_lock(). However, since cpu is from user
|
|
* space, let's do an extra quick check to filter out
|
|
* invalid value before smp_call_function_single().
|
|
*/
|
|
err = -ENXIO;
|
|
} else {
|
|
err = smp_call_function_single(cpu, __bpf_prog_test_run_raw_tp,
|
|
&info, 1);
|
|
}
|
|
put_cpu();
|
|
|
|
if (!err &&
|
|
copy_to_user(&uattr->test.retval, &info.retval, sizeof(u32)))
|
|
err = -EFAULT;
|
|
|
|
kfree(info.ctx);
|
|
return err;
|
|
}
|
|
|
|
static void *bpf_ctx_init(const union bpf_attr *kattr, u32 max_size)
|
|
{
|
|
void __user *data_in = u64_to_user_ptr(kattr->test.ctx_in);
|
|
void __user *data_out = u64_to_user_ptr(kattr->test.ctx_out);
|
|
u32 size = kattr->test.ctx_size_in;
|
|
void *data;
|
|
int err;
|
|
|
|
if (!data_in && !data_out)
|
|
return NULL;
|
|
|
|
data = kzalloc(max_size, GFP_USER);
|
|
if (!data)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
if (data_in) {
|
|
err = bpf_check_uarg_tail_zero(USER_BPFPTR(data_in), max_size, size);
|
|
if (err) {
|
|
kfree(data);
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
size = min_t(u32, max_size, size);
|
|
if (copy_from_user(data, data_in, size)) {
|
|
kfree(data);
|
|
return ERR_PTR(-EFAULT);
|
|
}
|
|
}
|
|
return data;
|
|
}
|
|
|
|
static int bpf_ctx_finish(const union bpf_attr *kattr,
|
|
union bpf_attr __user *uattr, const void *data,
|
|
u32 size)
|
|
{
|
|
void __user *data_out = u64_to_user_ptr(kattr->test.ctx_out);
|
|
int err = -EFAULT;
|
|
u32 copy_size = size;
|
|
|
|
if (!data || !data_out)
|
|
return 0;
|
|
|
|
if (copy_size > kattr->test.ctx_size_out) {
|
|
copy_size = kattr->test.ctx_size_out;
|
|
err = -ENOSPC;
|
|
}
|
|
|
|
if (copy_to_user(data_out, data, copy_size))
|
|
goto out;
|
|
if (copy_to_user(&uattr->test.ctx_size_out, &size, sizeof(size)))
|
|
goto out;
|
|
if (err != -ENOSPC)
|
|
err = 0;
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* range_is_zero - test whether buffer is initialized
|
|
* @buf: buffer to check
|
|
* @from: check from this position
|
|
* @to: check up until (excluding) this position
|
|
*
|
|
* This function returns true if the there is a non-zero byte
|
|
* in the buf in the range [from,to).
|
|
*/
|
|
static inline bool range_is_zero(void *buf, size_t from, size_t to)
|
|
{
|
|
return !memchr_inv((u8 *)buf + from, 0, to - from);
|
|
}
|
|
|
|
static int convert___skb_to_skb(struct sk_buff *skb, struct __sk_buff *__skb)
|
|
{
|
|
struct qdisc_skb_cb *cb = (struct qdisc_skb_cb *)skb->cb;
|
|
|
|
if (!__skb)
|
|
return 0;
|
|
|
|
/* make sure the fields we don't use are zeroed */
|
|
if (!range_is_zero(__skb, 0, offsetof(struct __sk_buff, mark)))
|
|
return -EINVAL;
|
|
|
|
/* mark is allowed */
|
|
|
|
if (!range_is_zero(__skb, offsetofend(struct __sk_buff, mark),
|
|
offsetof(struct __sk_buff, priority)))
|
|
return -EINVAL;
|
|
|
|
/* priority is allowed */
|
|
/* ingress_ifindex is allowed */
|
|
/* ifindex is allowed */
|
|
|
|
if (!range_is_zero(__skb, offsetofend(struct __sk_buff, ifindex),
|
|
offsetof(struct __sk_buff, cb)))
|
|
return -EINVAL;
|
|
|
|
/* cb is allowed */
|
|
|
|
if (!range_is_zero(__skb, offsetofend(struct __sk_buff, cb),
|
|
offsetof(struct __sk_buff, tstamp)))
|
|
return -EINVAL;
|
|
|
|
/* tstamp is allowed */
|
|
/* wire_len is allowed */
|
|
/* gso_segs is allowed */
|
|
|
|
if (!range_is_zero(__skb, offsetofend(struct __sk_buff, gso_segs),
|
|
offsetof(struct __sk_buff, gso_size)))
|
|
return -EINVAL;
|
|
|
|
/* gso_size is allowed */
|
|
|
|
if (!range_is_zero(__skb, offsetofend(struct __sk_buff, gso_size),
|
|
offsetof(struct __sk_buff, hwtstamp)))
|
|
return -EINVAL;
|
|
|
|
/* hwtstamp is allowed */
|
|
|
|
if (!range_is_zero(__skb, offsetofend(struct __sk_buff, hwtstamp),
|
|
sizeof(struct __sk_buff)))
|
|
return -EINVAL;
|
|
|
|
skb->mark = __skb->mark;
|
|
skb->priority = __skb->priority;
|
|
skb->skb_iif = __skb->ingress_ifindex;
|
|
skb->tstamp = __skb->tstamp;
|
|
memcpy(&cb->data, __skb->cb, QDISC_CB_PRIV_LEN);
|
|
|
|
if (__skb->wire_len == 0) {
|
|
cb->pkt_len = skb->len;
|
|
} else {
|
|
if (__skb->wire_len < skb->len ||
|
|
__skb->wire_len > GSO_LEGACY_MAX_SIZE)
|
|
return -EINVAL;
|
|
cb->pkt_len = __skb->wire_len;
|
|
}
|
|
|
|
if (__skb->gso_segs > GSO_MAX_SEGS)
|
|
return -EINVAL;
|
|
skb_shinfo(skb)->gso_segs = __skb->gso_segs;
|
|
skb_shinfo(skb)->gso_size = __skb->gso_size;
|
|
skb_shinfo(skb)->hwtstamps.hwtstamp = __skb->hwtstamp;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void convert_skb_to___skb(struct sk_buff *skb, struct __sk_buff *__skb)
|
|
{
|
|
struct qdisc_skb_cb *cb = (struct qdisc_skb_cb *)skb->cb;
|
|
|
|
if (!__skb)
|
|
return;
|
|
|
|
__skb->mark = skb->mark;
|
|
__skb->priority = skb->priority;
|
|
__skb->ingress_ifindex = skb->skb_iif;
|
|
__skb->ifindex = skb->dev->ifindex;
|
|
__skb->tstamp = skb->tstamp;
|
|
memcpy(__skb->cb, &cb->data, QDISC_CB_PRIV_LEN);
|
|
__skb->wire_len = cb->pkt_len;
|
|
__skb->gso_segs = skb_shinfo(skb)->gso_segs;
|
|
__skb->hwtstamp = skb_shinfo(skb)->hwtstamps.hwtstamp;
|
|
}
|
|
|
|
static struct proto bpf_dummy_proto = {
|
|
.name = "bpf_dummy",
|
|
.owner = THIS_MODULE,
|
|
.obj_size = sizeof(struct sock),
|
|
};
|
|
|
|
int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr,
|
|
union bpf_attr __user *uattr)
|
|
{
|
|
bool is_l2 = false, is_direct_pkt_access = false;
|
|
struct net *net = current->nsproxy->net_ns;
|
|
struct net_device *dev = net->loopback_dev;
|
|
u32 size = kattr->test.data_size_in;
|
|
u32 repeat = kattr->test.repeat;
|
|
struct __sk_buff *ctx = NULL;
|
|
u32 retval, duration;
|
|
int hh_len = ETH_HLEN;
|
|
struct sk_buff *skb;
|
|
struct sock *sk;
|
|
void *data;
|
|
int ret;
|
|
|
|
if (kattr->test.flags || kattr->test.cpu || kattr->test.batch_size)
|
|
return -EINVAL;
|
|
|
|
data = bpf_test_init(kattr, kattr->test.data_size_in,
|
|
size, NET_SKB_PAD + NET_IP_ALIGN,
|
|
SKB_DATA_ALIGN(sizeof(struct skb_shared_info)));
|
|
if (IS_ERR(data))
|
|
return PTR_ERR(data);
|
|
|
|
ctx = bpf_ctx_init(kattr, sizeof(struct __sk_buff));
|
|
if (IS_ERR(ctx)) {
|
|
kfree(data);
|
|
return PTR_ERR(ctx);
|
|
}
|
|
|
|
switch (prog->type) {
|
|
case BPF_PROG_TYPE_SCHED_CLS:
|
|
case BPF_PROG_TYPE_SCHED_ACT:
|
|
is_l2 = true;
|
|
fallthrough;
|
|
case BPF_PROG_TYPE_LWT_IN:
|
|
case BPF_PROG_TYPE_LWT_OUT:
|
|
case BPF_PROG_TYPE_LWT_XMIT:
|
|
is_direct_pkt_access = true;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
sk = sk_alloc(net, AF_UNSPEC, GFP_USER, &bpf_dummy_proto, 1);
|
|
if (!sk) {
|
|
kfree(data);
|
|
kfree(ctx);
|
|
return -ENOMEM;
|
|
}
|
|
sock_init_data(NULL, sk);
|
|
|
|
skb = slab_build_skb(data);
|
|
if (!skb) {
|
|
kfree(data);
|
|
kfree(ctx);
|
|
sk_free(sk);
|
|
return -ENOMEM;
|
|
}
|
|
skb->sk = sk;
|
|
|
|
skb_reserve(skb, NET_SKB_PAD + NET_IP_ALIGN);
|
|
__skb_put(skb, size);
|
|
if (ctx && ctx->ifindex > 1) {
|
|
dev = dev_get_by_index(net, ctx->ifindex);
|
|
if (!dev) {
|
|
ret = -ENODEV;
|
|
goto out;
|
|
}
|
|
}
|
|
skb->protocol = eth_type_trans(skb, dev);
|
|
skb_reset_network_header(skb);
|
|
|
|
switch (skb->protocol) {
|
|
case htons(ETH_P_IP):
|
|
sk->sk_family = AF_INET;
|
|
if (sizeof(struct iphdr) <= skb_headlen(skb)) {
|
|
sk->sk_rcv_saddr = ip_hdr(skb)->saddr;
|
|
sk->sk_daddr = ip_hdr(skb)->daddr;
|
|
}
|
|
break;
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
case htons(ETH_P_IPV6):
|
|
sk->sk_family = AF_INET6;
|
|
if (sizeof(struct ipv6hdr) <= skb_headlen(skb)) {
|
|
sk->sk_v6_rcv_saddr = ipv6_hdr(skb)->saddr;
|
|
sk->sk_v6_daddr = ipv6_hdr(skb)->daddr;
|
|
}
|
|
break;
|
|
#endif
|
|
default:
|
|
break;
|
|
}
|
|
|
|
if (is_l2)
|
|
__skb_push(skb, hh_len);
|
|
if (is_direct_pkt_access)
|
|
bpf_compute_data_pointers(skb);
|
|
ret = convert___skb_to_skb(skb, ctx);
|
|
if (ret)
|
|
goto out;
|
|
ret = bpf_test_run(prog, skb, repeat, &retval, &duration, false);
|
|
if (ret)
|
|
goto out;
|
|
if (!is_l2) {
|
|
if (skb_headroom(skb) < hh_len) {
|
|
int nhead = HH_DATA_ALIGN(hh_len - skb_headroom(skb));
|
|
|
|
if (pskb_expand_head(skb, nhead, 0, GFP_USER)) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
}
|
|
memset(__skb_push(skb, hh_len), 0, hh_len);
|
|
}
|
|
convert_skb_to___skb(skb, ctx);
|
|
|
|
size = skb->len;
|
|
/* bpf program can never convert linear skb to non-linear */
|
|
if (WARN_ON_ONCE(skb_is_nonlinear(skb)))
|
|
size = skb_headlen(skb);
|
|
ret = bpf_test_finish(kattr, uattr, skb->data, NULL, size, retval,
|
|
duration);
|
|
if (!ret)
|
|
ret = bpf_ctx_finish(kattr, uattr, ctx,
|
|
sizeof(struct __sk_buff));
|
|
out:
|
|
if (dev && dev != net->loopback_dev)
|
|
dev_put(dev);
|
|
kfree_skb(skb);
|
|
sk_free(sk);
|
|
kfree(ctx);
|
|
return ret;
|
|
}
|
|
|
|
static int xdp_convert_md_to_buff(struct xdp_md *xdp_md, struct xdp_buff *xdp)
|
|
{
|
|
unsigned int ingress_ifindex, rx_queue_index;
|
|
struct netdev_rx_queue *rxqueue;
|
|
struct net_device *device;
|
|
|
|
if (!xdp_md)
|
|
return 0;
|
|
|
|
if (xdp_md->egress_ifindex != 0)
|
|
return -EINVAL;
|
|
|
|
ingress_ifindex = xdp_md->ingress_ifindex;
|
|
rx_queue_index = xdp_md->rx_queue_index;
|
|
|
|
if (!ingress_ifindex && rx_queue_index)
|
|
return -EINVAL;
|
|
|
|
if (ingress_ifindex) {
|
|
device = dev_get_by_index(current->nsproxy->net_ns,
|
|
ingress_ifindex);
|
|
if (!device)
|
|
return -ENODEV;
|
|
|
|
if (rx_queue_index >= device->real_num_rx_queues)
|
|
goto free_dev;
|
|
|
|
rxqueue = __netif_get_rx_queue(device, rx_queue_index);
|
|
|
|
if (!xdp_rxq_info_is_reg(&rxqueue->xdp_rxq))
|
|
goto free_dev;
|
|
|
|
xdp->rxq = &rxqueue->xdp_rxq;
|
|
/* The device is now tracked in the xdp->rxq for later
|
|
* dev_put()
|
|
*/
|
|
}
|
|
|
|
xdp->data = xdp->data_meta + xdp_md->data;
|
|
return 0;
|
|
|
|
free_dev:
|
|
dev_put(device);
|
|
return -EINVAL;
|
|
}
|
|
|
|
static void xdp_convert_buff_to_md(struct xdp_buff *xdp, struct xdp_md *xdp_md)
|
|
{
|
|
if (!xdp_md)
|
|
return;
|
|
|
|
xdp_md->data = xdp->data - xdp->data_meta;
|
|
xdp_md->data_end = xdp->data_end - xdp->data_meta;
|
|
|
|
if (xdp_md->ingress_ifindex)
|
|
dev_put(xdp->rxq->dev);
|
|
}
|
|
|
|
int bpf_prog_test_run_xdp(struct bpf_prog *prog, const union bpf_attr *kattr,
|
|
union bpf_attr __user *uattr)
|
|
{
|
|
bool do_live = (kattr->test.flags & BPF_F_TEST_XDP_LIVE_FRAMES);
|
|
u32 tailroom = SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
|
|
u32 batch_size = kattr->test.batch_size;
|
|
u32 retval = 0, duration, max_data_sz;
|
|
u32 size = kattr->test.data_size_in;
|
|
u32 headroom = XDP_PACKET_HEADROOM;
|
|
u32 repeat = kattr->test.repeat;
|
|
struct netdev_rx_queue *rxqueue;
|
|
struct skb_shared_info *sinfo;
|
|
struct xdp_buff xdp = {};
|
|
int i, ret = -EINVAL;
|
|
struct xdp_md *ctx;
|
|
void *data;
|
|
|
|
if (prog->expected_attach_type == BPF_XDP_DEVMAP ||
|
|
prog->expected_attach_type == BPF_XDP_CPUMAP)
|
|
return -EINVAL;
|
|
|
|
if (kattr->test.flags & ~BPF_F_TEST_XDP_LIVE_FRAMES)
|
|
return -EINVAL;
|
|
|
|
if (bpf_prog_is_dev_bound(prog->aux))
|
|
return -EINVAL;
|
|
|
|
if (do_live) {
|
|
if (!batch_size)
|
|
batch_size = NAPI_POLL_WEIGHT;
|
|
else if (batch_size > TEST_XDP_MAX_BATCH)
|
|
return -E2BIG;
|
|
|
|
headroom += sizeof(struct xdp_page_head);
|
|
} else if (batch_size) {
|
|
return -EINVAL;
|
|
}
|
|
|
|
ctx = bpf_ctx_init(kattr, sizeof(struct xdp_md));
|
|
if (IS_ERR(ctx))
|
|
return PTR_ERR(ctx);
|
|
|
|
if (ctx) {
|
|
/* There can't be user provided data before the meta data */
|
|
if (ctx->data_meta || ctx->data_end != size ||
|
|
ctx->data > ctx->data_end ||
|
|
unlikely(xdp_metalen_invalid(ctx->data)) ||
|
|
(do_live && (kattr->test.data_out || kattr->test.ctx_out)))
|
|
goto free_ctx;
|
|
/* Meta data is allocated from the headroom */
|
|
headroom -= ctx->data;
|
|
}
|
|
|
|
max_data_sz = 4096 - headroom - tailroom;
|
|
if (size > max_data_sz) {
|
|
/* disallow live data mode for jumbo frames */
|
|
if (do_live)
|
|
goto free_ctx;
|
|
size = max_data_sz;
|
|
}
|
|
|
|
data = bpf_test_init(kattr, size, max_data_sz, headroom, tailroom);
|
|
if (IS_ERR(data)) {
|
|
ret = PTR_ERR(data);
|
|
goto free_ctx;
|
|
}
|
|
|
|
rxqueue = __netif_get_rx_queue(current->nsproxy->net_ns->loopback_dev, 0);
|
|
rxqueue->xdp_rxq.frag_size = headroom + max_data_sz + tailroom;
|
|
xdp_init_buff(&xdp, rxqueue->xdp_rxq.frag_size, &rxqueue->xdp_rxq);
|
|
xdp_prepare_buff(&xdp, data, headroom, size, true);
|
|
sinfo = xdp_get_shared_info_from_buff(&xdp);
|
|
|
|
ret = xdp_convert_md_to_buff(ctx, &xdp);
|
|
if (ret)
|
|
goto free_data;
|
|
|
|
if (unlikely(kattr->test.data_size_in > size)) {
|
|
void __user *data_in = u64_to_user_ptr(kattr->test.data_in);
|
|
|
|
while (size < kattr->test.data_size_in) {
|
|
struct page *page;
|
|
skb_frag_t *frag;
|
|
u32 data_len;
|
|
|
|
if (sinfo->nr_frags == MAX_SKB_FRAGS) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
page = alloc_page(GFP_KERNEL);
|
|
if (!page) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
frag = &sinfo->frags[sinfo->nr_frags++];
|
|
|
|
data_len = min_t(u32, kattr->test.data_size_in - size,
|
|
PAGE_SIZE);
|
|
skb_frag_fill_page_desc(frag, page, 0, data_len);
|
|
|
|
if (copy_from_user(page_address(page), data_in + size,
|
|
data_len)) {
|
|
ret = -EFAULT;
|
|
goto out;
|
|
}
|
|
sinfo->xdp_frags_size += data_len;
|
|
size += data_len;
|
|
}
|
|
xdp_buff_set_frags_flag(&xdp);
|
|
}
|
|
|
|
if (repeat > 1)
|
|
bpf_prog_change_xdp(NULL, prog);
|
|
|
|
if (do_live)
|
|
ret = bpf_test_run_xdp_live(prog, &xdp, repeat, batch_size, &duration);
|
|
else
|
|
ret = bpf_test_run(prog, &xdp, repeat, &retval, &duration, true);
|
|
/* We convert the xdp_buff back to an xdp_md before checking the return
|
|
* code so the reference count of any held netdevice will be decremented
|
|
* even if the test run failed.
|
|
*/
|
|
xdp_convert_buff_to_md(&xdp, ctx);
|
|
if (ret)
|
|
goto out;
|
|
|
|
size = xdp.data_end - xdp.data_meta + sinfo->xdp_frags_size;
|
|
ret = bpf_test_finish(kattr, uattr, xdp.data_meta, sinfo, size,
|
|
retval, duration);
|
|
if (!ret)
|
|
ret = bpf_ctx_finish(kattr, uattr, ctx,
|
|
sizeof(struct xdp_md));
|
|
|
|
out:
|
|
if (repeat > 1)
|
|
bpf_prog_change_xdp(prog, NULL);
|
|
free_data:
|
|
for (i = 0; i < sinfo->nr_frags; i++)
|
|
__free_page(skb_frag_page(&sinfo->frags[i]));
|
|
kfree(data);
|
|
free_ctx:
|
|
kfree(ctx);
|
|
return ret;
|
|
}
|
|
|
|
static int verify_user_bpf_flow_keys(struct bpf_flow_keys *ctx)
|
|
{
|
|
/* make sure the fields we don't use are zeroed */
|
|
if (!range_is_zero(ctx, 0, offsetof(struct bpf_flow_keys, flags)))
|
|
return -EINVAL;
|
|
|
|
/* flags is allowed */
|
|
|
|
if (!range_is_zero(ctx, offsetofend(struct bpf_flow_keys, flags),
|
|
sizeof(struct bpf_flow_keys)))
|
|
return -EINVAL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog,
|
|
const union bpf_attr *kattr,
|
|
union bpf_attr __user *uattr)
|
|
{
|
|
struct bpf_test_timer t = { NO_PREEMPT };
|
|
u32 size = kattr->test.data_size_in;
|
|
struct bpf_flow_dissector ctx = {};
|
|
u32 repeat = kattr->test.repeat;
|
|
struct bpf_flow_keys *user_ctx;
|
|
struct bpf_flow_keys flow_keys;
|
|
const struct ethhdr *eth;
|
|
unsigned int flags = 0;
|
|
u32 retval, duration;
|
|
void *data;
|
|
int ret;
|
|
|
|
if (kattr->test.flags || kattr->test.cpu || kattr->test.batch_size)
|
|
return -EINVAL;
|
|
|
|
if (size < ETH_HLEN)
|
|
return -EINVAL;
|
|
|
|
data = bpf_test_init(kattr, kattr->test.data_size_in, size, 0, 0);
|
|
if (IS_ERR(data))
|
|
return PTR_ERR(data);
|
|
|
|
eth = (struct ethhdr *)data;
|
|
|
|
if (!repeat)
|
|
repeat = 1;
|
|
|
|
user_ctx = bpf_ctx_init(kattr, sizeof(struct bpf_flow_keys));
|
|
if (IS_ERR(user_ctx)) {
|
|
kfree(data);
|
|
return PTR_ERR(user_ctx);
|
|
}
|
|
if (user_ctx) {
|
|
ret = verify_user_bpf_flow_keys(user_ctx);
|
|
if (ret)
|
|
goto out;
|
|
flags = user_ctx->flags;
|
|
}
|
|
|
|
ctx.flow_keys = &flow_keys;
|
|
ctx.data = data;
|
|
ctx.data_end = (__u8 *)data + size;
|
|
|
|
bpf_test_timer_enter(&t);
|
|
do {
|
|
retval = bpf_flow_dissect(prog, &ctx, eth->h_proto, ETH_HLEN,
|
|
size, flags);
|
|
} while (bpf_test_timer_continue(&t, 1, repeat, &ret, &duration));
|
|
bpf_test_timer_leave(&t);
|
|
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
ret = bpf_test_finish(kattr, uattr, &flow_keys, NULL,
|
|
sizeof(flow_keys), retval, duration);
|
|
if (!ret)
|
|
ret = bpf_ctx_finish(kattr, uattr, user_ctx,
|
|
sizeof(struct bpf_flow_keys));
|
|
|
|
out:
|
|
kfree(user_ctx);
|
|
kfree(data);
|
|
return ret;
|
|
}
|
|
|
|
int bpf_prog_test_run_sk_lookup(struct bpf_prog *prog, const union bpf_attr *kattr,
|
|
union bpf_attr __user *uattr)
|
|
{
|
|
struct bpf_test_timer t = { NO_PREEMPT };
|
|
struct bpf_prog_array *progs = NULL;
|
|
struct bpf_sk_lookup_kern ctx = {};
|
|
u32 repeat = kattr->test.repeat;
|
|
struct bpf_sk_lookup *user_ctx;
|
|
u32 retval, duration;
|
|
int ret = -EINVAL;
|
|
|
|
if (kattr->test.flags || kattr->test.cpu || kattr->test.batch_size)
|
|
return -EINVAL;
|
|
|
|
if (kattr->test.data_in || kattr->test.data_size_in || kattr->test.data_out ||
|
|
kattr->test.data_size_out)
|
|
return -EINVAL;
|
|
|
|
if (!repeat)
|
|
repeat = 1;
|
|
|
|
user_ctx = bpf_ctx_init(kattr, sizeof(*user_ctx));
|
|
if (IS_ERR(user_ctx))
|
|
return PTR_ERR(user_ctx);
|
|
|
|
if (!user_ctx)
|
|
return -EINVAL;
|
|
|
|
if (user_ctx->sk)
|
|
goto out;
|
|
|
|
if (!range_is_zero(user_ctx, offsetofend(typeof(*user_ctx), local_port), sizeof(*user_ctx)))
|
|
goto out;
|
|
|
|
if (user_ctx->local_port > U16_MAX) {
|
|
ret = -ERANGE;
|
|
goto out;
|
|
}
|
|
|
|
ctx.family = (u16)user_ctx->family;
|
|
ctx.protocol = (u16)user_ctx->protocol;
|
|
ctx.dport = (u16)user_ctx->local_port;
|
|
ctx.sport = user_ctx->remote_port;
|
|
|
|
switch (ctx.family) {
|
|
case AF_INET:
|
|
ctx.v4.daddr = (__force __be32)user_ctx->local_ip4;
|
|
ctx.v4.saddr = (__force __be32)user_ctx->remote_ip4;
|
|
break;
|
|
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
case AF_INET6:
|
|
ctx.v6.daddr = (struct in6_addr *)user_ctx->local_ip6;
|
|
ctx.v6.saddr = (struct in6_addr *)user_ctx->remote_ip6;
|
|
break;
|
|
#endif
|
|
|
|
default:
|
|
ret = -EAFNOSUPPORT;
|
|
goto out;
|
|
}
|
|
|
|
progs = bpf_prog_array_alloc(1, GFP_KERNEL);
|
|
if (!progs) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
progs->items[0].prog = prog;
|
|
|
|
bpf_test_timer_enter(&t);
|
|
do {
|
|
ctx.selected_sk = NULL;
|
|
retval = BPF_PROG_SK_LOOKUP_RUN_ARRAY(progs, ctx, bpf_prog_run);
|
|
} while (bpf_test_timer_continue(&t, 1, repeat, &ret, &duration));
|
|
bpf_test_timer_leave(&t);
|
|
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
user_ctx->cookie = 0;
|
|
if (ctx.selected_sk) {
|
|
if (ctx.selected_sk->sk_reuseport && !ctx.no_reuseport) {
|
|
ret = -EOPNOTSUPP;
|
|
goto out;
|
|
}
|
|
|
|
user_ctx->cookie = sock_gen_cookie(ctx.selected_sk);
|
|
}
|
|
|
|
ret = bpf_test_finish(kattr, uattr, NULL, NULL, 0, retval, duration);
|
|
if (!ret)
|
|
ret = bpf_ctx_finish(kattr, uattr, user_ctx, sizeof(*user_ctx));
|
|
|
|
out:
|
|
bpf_prog_array_free(progs);
|
|
kfree(user_ctx);
|
|
return ret;
|
|
}
|
|
|
|
int bpf_prog_test_run_syscall(struct bpf_prog *prog,
|
|
const union bpf_attr *kattr,
|
|
union bpf_attr __user *uattr)
|
|
{
|
|
void __user *ctx_in = u64_to_user_ptr(kattr->test.ctx_in);
|
|
__u32 ctx_size_in = kattr->test.ctx_size_in;
|
|
void *ctx = NULL;
|
|
u32 retval;
|
|
int err = 0;
|
|
|
|
/* doesn't support data_in/out, ctx_out, duration, or repeat or flags */
|
|
if (kattr->test.data_in || kattr->test.data_out ||
|
|
kattr->test.ctx_out || kattr->test.duration ||
|
|
kattr->test.repeat || kattr->test.flags ||
|
|
kattr->test.batch_size)
|
|
return -EINVAL;
|
|
|
|
if (ctx_size_in < prog->aux->max_ctx_offset ||
|
|
ctx_size_in > U16_MAX)
|
|
return -EINVAL;
|
|
|
|
if (ctx_size_in) {
|
|
ctx = memdup_user(ctx_in, ctx_size_in);
|
|
if (IS_ERR(ctx))
|
|
return PTR_ERR(ctx);
|
|
}
|
|
|
|
rcu_read_lock_trace();
|
|
retval = bpf_prog_run_pin_on_cpu(prog, ctx);
|
|
rcu_read_unlock_trace();
|
|
|
|
if (copy_to_user(&uattr->test.retval, &retval, sizeof(u32))) {
|
|
err = -EFAULT;
|
|
goto out;
|
|
}
|
|
if (ctx_size_in)
|
|
if (copy_to_user(ctx_in, ctx, ctx_size_in))
|
|
err = -EFAULT;
|
|
out:
|
|
kfree(ctx);
|
|
return err;
|
|
}
|
|
|
|
static int verify_and_copy_hook_state(struct nf_hook_state *state,
|
|
const struct nf_hook_state *user,
|
|
struct net_device *dev)
|
|
{
|
|
if (user->in || user->out)
|
|
return -EINVAL;
|
|
|
|
if (user->net || user->sk || user->okfn)
|
|
return -EINVAL;
|
|
|
|
switch (user->pf) {
|
|
case NFPROTO_IPV4:
|
|
case NFPROTO_IPV6:
|
|
switch (state->hook) {
|
|
case NF_INET_PRE_ROUTING:
|
|
state->in = dev;
|
|
break;
|
|
case NF_INET_LOCAL_IN:
|
|
state->in = dev;
|
|
break;
|
|
case NF_INET_FORWARD:
|
|
state->in = dev;
|
|
state->out = dev;
|
|
break;
|
|
case NF_INET_LOCAL_OUT:
|
|
state->out = dev;
|
|
break;
|
|
case NF_INET_POST_ROUTING:
|
|
state->out = dev;
|
|
break;
|
|
}
|
|
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
state->pf = user->pf;
|
|
state->hook = user->hook;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static __be16 nfproto_eth(int nfproto)
|
|
{
|
|
switch (nfproto) {
|
|
case NFPROTO_IPV4:
|
|
return htons(ETH_P_IP);
|
|
case NFPROTO_IPV6:
|
|
break;
|
|
}
|
|
|
|
return htons(ETH_P_IPV6);
|
|
}
|
|
|
|
int bpf_prog_test_run_nf(struct bpf_prog *prog,
|
|
const union bpf_attr *kattr,
|
|
union bpf_attr __user *uattr)
|
|
{
|
|
struct net *net = current->nsproxy->net_ns;
|
|
struct net_device *dev = net->loopback_dev;
|
|
struct nf_hook_state *user_ctx, hook_state = {
|
|
.pf = NFPROTO_IPV4,
|
|
.hook = NF_INET_LOCAL_OUT,
|
|
};
|
|
u32 size = kattr->test.data_size_in;
|
|
u32 repeat = kattr->test.repeat;
|
|
struct bpf_nf_ctx ctx = {
|
|
.state = &hook_state,
|
|
};
|
|
struct sk_buff *skb = NULL;
|
|
u32 retval, duration;
|
|
void *data;
|
|
int ret;
|
|
|
|
if (kattr->test.flags || kattr->test.cpu || kattr->test.batch_size)
|
|
return -EINVAL;
|
|
|
|
if (size < sizeof(struct iphdr))
|
|
return -EINVAL;
|
|
|
|
data = bpf_test_init(kattr, kattr->test.data_size_in, size,
|
|
NET_SKB_PAD + NET_IP_ALIGN,
|
|
SKB_DATA_ALIGN(sizeof(struct skb_shared_info)));
|
|
if (IS_ERR(data))
|
|
return PTR_ERR(data);
|
|
|
|
if (!repeat)
|
|
repeat = 1;
|
|
|
|
user_ctx = bpf_ctx_init(kattr, sizeof(struct nf_hook_state));
|
|
if (IS_ERR(user_ctx)) {
|
|
kfree(data);
|
|
return PTR_ERR(user_ctx);
|
|
}
|
|
|
|
if (user_ctx) {
|
|
ret = verify_and_copy_hook_state(&hook_state, user_ctx, dev);
|
|
if (ret)
|
|
goto out;
|
|
}
|
|
|
|
skb = slab_build_skb(data);
|
|
if (!skb) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
data = NULL; /* data released via kfree_skb */
|
|
|
|
skb_reserve(skb, NET_SKB_PAD + NET_IP_ALIGN);
|
|
__skb_put(skb, size);
|
|
|
|
ret = -EINVAL;
|
|
|
|
if (hook_state.hook != NF_INET_LOCAL_OUT) {
|
|
if (size < ETH_HLEN + sizeof(struct iphdr))
|
|
goto out;
|
|
|
|
skb->protocol = eth_type_trans(skb, dev);
|
|
switch (skb->protocol) {
|
|
case htons(ETH_P_IP):
|
|
if (hook_state.pf == NFPROTO_IPV4)
|
|
break;
|
|
goto out;
|
|
case htons(ETH_P_IPV6):
|
|
if (size < ETH_HLEN + sizeof(struct ipv6hdr))
|
|
goto out;
|
|
if (hook_state.pf == NFPROTO_IPV6)
|
|
break;
|
|
goto out;
|
|
default:
|
|
ret = -EPROTO;
|
|
goto out;
|
|
}
|
|
|
|
skb_reset_network_header(skb);
|
|
} else {
|
|
skb->protocol = nfproto_eth(hook_state.pf);
|
|
}
|
|
|
|
ctx.skb = skb;
|
|
|
|
ret = bpf_test_run(prog, &ctx, repeat, &retval, &duration, false);
|
|
if (ret)
|
|
goto out;
|
|
|
|
ret = bpf_test_finish(kattr, uattr, NULL, NULL, 0, retval, duration);
|
|
|
|
out:
|
|
kfree(user_ctx);
|
|
kfree_skb(skb);
|
|
kfree(data);
|
|
return ret;
|
|
}
|
|
|
|
static const struct btf_kfunc_id_set bpf_prog_test_kfunc_set = {
|
|
.owner = THIS_MODULE,
|
|
.set = &test_sk_check_kfunc_ids,
|
|
};
|
|
|
|
BTF_ID_LIST(bpf_prog_test_dtor_kfunc_ids)
|
|
BTF_ID(struct, prog_test_ref_kfunc)
|
|
BTF_ID(func, bpf_kfunc_call_test_release)
|
|
BTF_ID(struct, prog_test_member)
|
|
BTF_ID(func, bpf_kfunc_call_memb_release)
|
|
|
|
static int __init bpf_prog_test_run_init(void)
|
|
{
|
|
const struct btf_id_dtor_kfunc bpf_prog_test_dtor_kfunc[] = {
|
|
{
|
|
.btf_id = bpf_prog_test_dtor_kfunc_ids[0],
|
|
.kfunc_btf_id = bpf_prog_test_dtor_kfunc_ids[1]
|
|
},
|
|
{
|
|
.btf_id = bpf_prog_test_dtor_kfunc_ids[2],
|
|
.kfunc_btf_id = bpf_prog_test_dtor_kfunc_ids[3],
|
|
},
|
|
};
|
|
int ret;
|
|
|
|
ret = register_btf_fmodret_id_set(&bpf_test_modify_return_set);
|
|
ret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_SCHED_CLS, &bpf_prog_test_kfunc_set);
|
|
ret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_TRACING, &bpf_prog_test_kfunc_set);
|
|
ret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_SYSCALL, &bpf_prog_test_kfunc_set);
|
|
return ret ?: register_btf_id_dtor_kfuncs(bpf_prog_test_dtor_kfunc,
|
|
ARRAY_SIZE(bpf_prog_test_dtor_kfunc),
|
|
THIS_MODULE);
|
|
}
|
|
late_initcall(bpf_prog_test_run_init);
|