ee77f3d602
When building the latest kernel/selftest with clang17 compiler:
make LLVM=1 -j <== for kernel
make -C tools/testing/selftests/bpf LLVM=1 -j <== for selftest
I hit the following compilation error:
[...]
In file included from progs/vrf_socket_lookup.c:3:
In file included from /usr/include/linux/ip.h:21:
In file included from /usr/include/asm/byteorder.h:5:
In file included from /usr/include/linux/byteorder/little_endian.h:13:
/usr/include/linux/swab.h:136:8: error: unknown type name '__always_inline'
136 | static __always_inline unsigned long __swab(const unsigned long y)
| ^
/usr/include/linux/swab.h:171:8: error: unknown type name '__always_inline'
171 | static __always_inline __u16 __swab16p(const __u16 *p)
| ^
/usr/include/linux/swab.h:171:29: error: expected ';' after top level declarator
171 | static __always_inline __u16 __swab16p(const __u16 *p)
| ^
[...]
Basically, with header files in my local host which is based on 5.12 kernel,
__always_inline is not defined and this caused compilation failure.
Since __always_inline is defined in bpf_helpers.h, let us move bpf_helpers.h
to an early position which fixed the problem.
Signed-off-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20230622061921.816772-1-yhs@fb.com
89 lines
1.6 KiB
C
89 lines
1.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/bpf.h>
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#include <bpf/bpf_helpers.h>
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#include <bpf/bpf_endian.h>
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#include <linux/ip.h>
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#include <linux/in.h>
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#include <linux/if_ether.h>
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#include <linux/pkt_cls.h>
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#include <stdbool.h>
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int lookup_status;
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bool test_xdp;
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bool tcp_skc;
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#define CUR_NS BPF_F_CURRENT_NETNS
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static void socket_lookup(void *ctx, void *data_end, void *data)
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{
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struct ethhdr *eth = data;
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struct bpf_sock_tuple *tp;
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struct bpf_sock *sk;
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struct iphdr *iph;
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int tplen;
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if (eth + 1 > data_end)
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return;
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if (eth->h_proto != bpf_htons(ETH_P_IP))
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return;
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iph = (struct iphdr *)(eth + 1);
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if (iph + 1 > data_end)
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return;
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tp = (struct bpf_sock_tuple *)&iph->saddr;
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tplen = sizeof(tp->ipv4);
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if ((void *)tp + tplen > data_end)
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return;
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switch (iph->protocol) {
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case IPPROTO_TCP:
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if (tcp_skc)
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sk = bpf_skc_lookup_tcp(ctx, tp, tplen, CUR_NS, 0);
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else
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sk = bpf_sk_lookup_tcp(ctx, tp, tplen, CUR_NS, 0);
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break;
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case IPPROTO_UDP:
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sk = bpf_sk_lookup_udp(ctx, tp, tplen, CUR_NS, 0);
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break;
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default:
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return;
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}
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lookup_status = 0;
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if (sk) {
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bpf_sk_release(sk);
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lookup_status = 1;
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}
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}
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SEC("tc")
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int tc_socket_lookup(struct __sk_buff *skb)
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{
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void *data_end = (void *)(long)skb->data_end;
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void *data = (void *)(long)skb->data;
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if (test_xdp)
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return TC_ACT_UNSPEC;
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socket_lookup(skb, data_end, data);
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return TC_ACT_UNSPEC;
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}
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SEC("xdp")
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int xdp_socket_lookup(struct xdp_md *xdp)
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{
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void *data_end = (void *)(long)xdp->data_end;
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void *data = (void *)(long)xdp->data;
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if (!test_xdp)
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return XDP_PASS;
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socket_lookup(xdp, data_end, data);
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return XDP_PASS;
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}
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char _license[] SEC("license") = "GPL";
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