如何解决更新套接字映射失败
我正在做 BPF 编程,我想在套接字映射中添加一个套接字。代码如下
__section("sockops")
int bpf_sockmap(struct bpf_sock_ops *skops)
{
switch (skops->op) {
case BPF_SOCK_OPS_TCP_LISTEN_CB:
if (skops->family == 2) {
bpf_sock_ops_ipv4(skops);
}
break;
case BPF_SOCK_OPS_TCP_CONNECT_CB:
if (skops->family == 2) {
bpf_sock_ops_ipv4(skops);
}
break;
default:
break;
}
return 0;
}
bpf_sock_ops_ipv4()
是
void bpf_sock_ops_ipv4(struct bpf_sock_ops *skops)
{
struct sock_key key = {};
int ret;
extract_key4_from_ops(skops,&key); // extract some field from skops to form the key structure
ret = sock_hash_update(skops,&sock_ops_map,&key,BPF_ANY);
if (ret != 0) {
printk("sock_hash_update() Failed,ret: %d\n",ret);
}
printk("sockmap: op %d,port %d --> %d\n",skops->op,skops->local_port,bpf_ntohl(skops->remote_port));
}
地图结构
struct bpf_map_def __section("maps") sock_ops_map = {
.type = BPF_MAP_TYPE_SOCKHASH,.key_size = sizeof(struct sock_key),.value_size = sizeof(int),.max_entries = 65535,.map_flags = 0,};
密钥结构
struct sock_key {
__u32 ops;
__u32 sip4;
__u32 dip4;
__u8 family;
__u8 pad1;
__u16 pad2;
__u32 pad3;
__u32 sport;
__u32 dport;
} __attribute__((packed));
当我加载它并使用 sudo socat TCP4-LISTEN:1001,fork exec:cat
初始化服务器时,更新失败
sudo cat /sys/kernel/debug/tracing/trace_pipe
socat-1239 [002] .... 2020.217663: 0: sock_hash_update() Failed,ret: -95
socat-1239 [002] .... 2020.217682: 0: sockmap: op 11,port 1001 --> 0
版权声明:本文内容由互联网用户自发贡献,该文观点与技术仅代表作者本人。本站仅提供信息存储空间服务,不拥有所有权,不承担相关法律责任。如发现本站有涉嫌侵权/违法违规的内容, 请发送邮件至 dio@foxmail.com 举报,一经查实,本站将立刻删除。