调用kernel_sendmsg来发送信息，调用kernel_recvmsg来接收信息，调用kernel_sock_shutdown函数来关闭连接，调...
现在,让我们转向一个发送UDP数据的用户程序,看看内核中如何调用udp_sendmsg! Sending network data via a socket A user program wants to send UDP network data and so it uses the sendto system call, maybe like this: 用户程序想要发送UDP网络数据,因此它使用sentto系统调用,可能如下所示: 代码语言:javas...
如下是一个kernel中调用底层算法的一个示例(因skcipher为例): static int test_skcipher(void){struct crypto_skcipher *tfm = NULL;struct skcipher_request *req = NULL;u8 *data = NULL;const size_t datasize = 512; /* data size in bytes */struct scatterlist sg;DECLARE_CRYPTO_WAIT(wait);u8 iv[...
2、不同点在于调用的API不同,linux内核中调用的是sock_create_kern函数来创建socket,调用sock->ops->connect来连接服务端(PS:这里的sock是前面创建的socket连接符),调用kernel_sendmsg来发送信息,调用kernel_recvmsg来接收信息,调用kernel_sock_shutdown函数来关闭连接,调用sock_release函数来释放socket连接符,按照用户层...
sendmsg recvmsg 1. 2. 3. 4. 5. 6. (2)相关代码 复制 staticintlinux_af_alg_socket(constchar*type,constchar*name){struct sockaddr_alg sa;ints;s=socket(AF_ALG,SOCK_SEQPACKET,0);if(s<0){LogErr("%s: Failed to open AF_ALG socket: %s\n",__func__,strerror(errno));return-1;}os...
用户态应用使用标准的socket APIs, socket(), bind(), sendmsg(), recvmsg() 和 close() 就能很容易地使用 netlink socket,查询手册页可以了解这些函数的使用细节,本文只是讲解使用 netlink 的用户应该如何使用这些函数。注意,使用 netlink 的应用必须包含头文件 linux/netlink.h。当然 socket 需要的头文件也必...
socket(AF_ALG,...)bindsetsockoptacceptsendmsgrecvmsg (2)相关代码 static int linux_af_alg_socket(const char *type, const char *name){struct sockaddr_alg sa;int s; s = socket(AF_ALG, SOCK_SEQPACKET, 0);if (s < 0) {LogErr("%s: Failed to open AF_ALG socket: %s\n",__func__, ...
- 其他思路,可以覆盖 udp_sendmsg() 的局部变量,或者覆写 verdict chain 指针(使用register值例如 0x7fffff00)。 - 作者尝试先修改 base chain hook。如果将一个 output chain 修改成 input 会发生什么呢?发送UDP packet 到达 input hook时,nft_do_chain() 中触发OOB时的栈布局情况如下所示(会在软中断上下文...
This applies to the write system call and all the send variants: send, sendto, and sendmsg). IMPORTANT Broken pipe terminations are even more troubling with sockets because sockets are commonly used for networking, where you have no control over the remote peer. It’s easy to reproduce this...
- net: fix uninit-value in caif_seqpkt_sendmsg - bpftool: Check malloc return value in mount_bpffs_for_pin - bpf, sockmap, udp: sk_prot needs inuse_idx set for proc stats - bpf, sockmap, tcp: sk_prot needs inuse_idx set for proc stats ...