DD : - - - int xdp_program(struct xdp_md *ctx) { uint8_t *head = (uint8_t *)(long)(ctx->data); uint8_t *tail = (uint8_t *)(long)(ctx->data_end); struct eth *eth = (struct eth *)head; if (eth->type != htons(ETH_P_IP)) { return XDP_DROP; } return XDP_PASS; } A D - D 4 6 C D 6 D , DA D D CD D: A D A - CC D D: A D CD / 6 4 D D: CC 6 . 6 D D D: C CA C -: C 9%1BTB#VJMEJOH#MPDLPGUIF"EWBODFE--PBE#BMBODFSTc:VUBSP )BZBLBXB