Question

我正在尝试为ICMP数据包设置ACL结构。为此，我将数据指针设置为指向mbuf中IP src字段的指针，并使用以下结构来定义ACL数组：

struct icmp_acl_tuple {
uint32_t src_ip;
uint32_t dst_ip;
uint8_t  type;
uint8_t  code;};



static struct rte_acl_field_def icmp_defs[C_NUM_FIELDS_ICMP] = {
{
    .type = RTE_ACL_FIELD_TYPE_BITMASK,
    .size = sizeof(uint8_t),
    .field_index = C_TYPE_FIELD_ICMP,
    .input_index = 0,
    .offset = offsetof (struct icmp_acl_tuple, type),
},
/* next input field (IPv4 source address) - 4 consecutive bytes. */
{
    .type = RTE_ACL_FIELD_TYPE_MASK,
    .size = sizeof (uint32_t),
    .field_index = C_SRC_FIELD_ICMP,
    .input_index = 1,
    .offset = offsetof (struct icmp_acl_tuple, src_ip),
},
/* next input field (IPv4 destination address) - 4 consecutive bytes. */
{
    .type = RTE_ACL_FIELD_TYPE_MASK,
    .size = sizeof (uint32_t),
    .field_index = C_DST_FIELD_ICMP,
    .input_index = 2,
    .offset = offsetof (struct icmp_acl_tuple, dst_ip),
},
/*due to DPDK restrictions, 32bit should be used (although one byte field)*/
{
    .type = RTE_ACL_FIELD_TYPE_BITMASK,
    .size = sizeof (uint32_t),
    .field_index = C_CODE_FIELD_ICMP,
    .input_index = 3,
    .offset = offsetof (struct icmp_acl_tuple, code),
},};

我的问题在于＆＃39; Code＆＃39;场（最后一个）。我无法得到理想的行动。

我该如何设置此字段的值和掩码？我用u8，u32，u32尝试了偏移量。没有用。

Answer 1

最后一个参数C_CODE_FIELD_ICMP的大小字段应该设置为1，而不是4。因为根据DPDK-ACL size The size parameter defines the length of the field in bytes.。问题与RTE_ACL_FIELD_TYPE_BITMASK无关。

如何为非对齐字段设置值和掩码

1 个答案: