传输层实现

最新推荐文章于 2023-10-08 21:30:00 发布

原创最新推荐文章于 2023-10-08 21:30:00 发布 · 524 阅读

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Linux Kernel 同时被 2 个专栏收录

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Linux Kernel 网络实现

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本文详细介绍了Linux内核中网络协议栈的实现方式，特别是针对TCP/IP协议族的处理流程。通过具体的数据结构定义，展示了不同类型的套接字（如流式套接字、数据报套接字和原始套接字）如何与特定的传输层协议（如TCP、UDP）相匹配，并关联相应的操作集。此外，还列举了内核启动时如何将这些元素插入到连接列表中。

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struct inet_protosw {
struct list_head list;

/* These two fields form the lookup key. */
unsigned short type; /* This is the 2nd argument to socket(2). */
unsigned short protocol; /* This is the L4 protocol number. */

struct proto *prot;
const struct proto_ops *ops;

unsigned char flags; /* See INET_PROTOSW_* below. */

};

/* Upon startup we insert all the elements in inetsw_array[] into
* the linked list inetsw.
*/
static struct inet_protosw inetsw_array[] =
{
{
.type = SOCK_STREAM,
.protocol = IPPROTO_TCP,
.prot = &tcp_prot,
.ops = &inet_stream_ops,
.flags = INET_PROTOSW_PERMANENT |
INET_PROTOSW_ICSK,
},

{
.type = SOCK_DGRAM,
.protocol = IPPROTO_UDP,
.prot = &udp_prot,
.ops = &inet_dgram_ops,
.flags = INET_PROTOSW_PERMANENT,
},

{
.type = SOCK_DGRAM,
.protocol = IPPROTO_ICMP,
.prot = &ping_prot,
.ops = &inet_dgram_ops,
.flags = INET_PROTOSW_REUSE,
},

{
.type = SOCK_RAW,
.protocol = IPPROTO_IP, /* wild card */
.prot = &raw_prot,
.ops = &inet_sockraw_ops,
.flags = INET_PROTOSW_REUSE,
}
};