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farp: Fix BPF jump false offset

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Jump to BPF_STMT(BPF_RET+BPF_K, 0) if protocol_size != 4
This commit is contained in:
Volker Rümelin
2016-10-31 14:46:14 +01:00
committed by Tobias Brunner
parent 4a97999466
commit d17b780eaa
1 changed files with 1 additions and 1 deletions
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src/libcharon/plugins/farp/farp_spoofer.c
+1 -1
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@@ -143,7 +143,7 @@ farp_spoofer_t *farp_spoofer_create(farp_listener_t *listener)
BPF_STMT(BPF_LD+BPF_B+BPF_ABS, offsetof(arp_t, hardware_size)),
BPF_JUMP(BPF_JMP+BPF_JEQ+BPF_K, 6, 0, 7),
BPF_STMT(BPF_LD+BPF_B+BPF_ABS, offsetof(arp_t, protocol_size)),
BPF_JUMP(BPF_JMP+BPF_JEQ+BPF_K, 4, 0, 4),
BPF_JUMP(BPF_JMP+BPF_JEQ+BPF_K, 4, 0, 5),
BPF_STMT(BPF_LD+BPF_H+BPF_ABS, offsetof(arp_t, opcode)),
BPF_JUMP(BPF_JMP+BPF_JEQ+BPF_K, ARPOP_REQUEST, 0, 3),
BPF_STMT(BPF_LD+BPF_W+BPF_LEN, 0),