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Verify that bpf_skb_adjust_room() clears the routing dst even when the encap L3 protocol matches the original packet (e.g. IPIP). The dst selected for the inner packet is not valid for the encapsulated result; a stale dst could lead to misrouting. Signed-off-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org> Acked-by: Daniel Borkmann <daniel@iogearbox.net> Link: https://patch.msgid.link/20260329180428.2657785-2-kuba@kernel.org
56 lines
1.4 KiB
C
56 lines
1.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright (c) 2026 Meta Platforms, Inc. and affiliates. */
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <net/if.h>
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#include "test_progs.h"
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#include "network_helpers.h"
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#include "test_dst_clear.skel.h"
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#define IPV4_IFACE_ADDR "1.0.0.1"
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#define UDP_TEST_PORT 7777
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void test_ns_dst_clear(void)
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{
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LIBBPF_OPTS(bpf_tcx_opts, tcx_opts);
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struct test_dst_clear *skel;
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struct sockaddr_in addr;
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struct bpf_link *link;
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socklen_t addrlen;
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char buf[128] = {};
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int sockfd, err;
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skel = test_dst_clear__open_and_load();
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if (!ASSERT_OK_PTR(skel, "skel open_and_load"))
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return;
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SYS(fail, "ip addr add %s/8 dev lo", IPV4_IFACE_ADDR);
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link = bpf_program__attach_tcx(skel->progs.dst_clear,
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if_nametoindex("lo"), &tcx_opts);
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if (!ASSERT_OK_PTR(link, "attach_tcx"))
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goto fail;
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skel->links.dst_clear = link;
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addrlen = sizeof(addr);
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err = make_sockaddr(AF_INET, IPV4_IFACE_ADDR, UDP_TEST_PORT,
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(void *)&addr, &addrlen);
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if (!ASSERT_OK(err, "make_sockaddr"))
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goto fail;
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sockfd = socket(AF_INET, SOCK_DGRAM, 0);
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if (!ASSERT_NEQ(sockfd, -1, "socket"))
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goto fail;
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err = sendto(sockfd, buf, sizeof(buf), 0, (void *)&addr, addrlen);
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close(sockfd);
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if (!ASSERT_EQ(err, sizeof(buf), "send"))
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goto fail;
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ASSERT_TRUE(skel->bss->had_dst, "had_dst");
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ASSERT_TRUE(skel->bss->dst_cleared, "dst_cleared");
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fail:
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test_dst_clear__destroy(skel);
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}
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