OpenHarmony设备开发标准系统内核(Linux) 内核增强特性

CONFIG_HYPERHOLD=y                  // Enable HyperHold
CONFIG_HYPERHOLD_DEBUG=y            // Enable HyperHold Debug
CONFIG_HYPERHOLD_ZSWAPD=y           // Enable zswapd thread to reclaim anon pages in background
CONFIG_HYPERHOLD_FILE_LRU=y         // Enable HyperHold FILE LRU
CONFIG_HYPERHOLD_MEMCG=y            // Enable Memcg Management in HyperHold
CONFIG_ZRAM_GROUP=y                 // Enable Manage Zram objs with mem_cgroup
CONFIG_ZRAM_GROUP_DEBUG=y           // Enable Manage Zram objs with mem_cgroup Debug
CONFIG_ZLIST_DEBUG=y                // Enable Debug info for zram group list
CONFIG_ZRAM_GROUP_WRITEBACK=y       // Enable Write back grouped zram objs to Hyperhold driver

CONFIG_MEMCG=y       // Enable Memory controller
CONFIG_SWAP=y        // Enable Support for paging of anonymous memory (swap)
CONFIG_ZSMALLOC=y    // Enable Memory allocator for compressed pages
CONFIG_ZRAM=y        // Enable Compressed RAM block device support

// 通过dd命令创建一个文件hpdisk用于ESwap换出，具体大小需根据产品及需求调整，此处设置为512MB。
dd if=/dev/random of=/data/hpdisk bs=4096 count=131072
// 将上一步创建的hpdisk与ESwap device进行绑定。
losetup /dev/block/loop6 hpdisk
    Bash

echo /dev/block/loop6 > /proc/sys/kernel/hyperhold/device
    Bash

// 需咨询开发板厂商是否支持并开启硬加密，否则不要执行该操作。
echo 0 > /proc/sys/kernel/hyperhold/soft_crypt
    Bash

echo enable > /proc/sys/kernel/hyperhold/enable
    Bash

// 打开ZRAM到ESwap的换入换出功能，该步骤必须要在配置ZRAM大小之前。
echo readwrite > /sys/block/zram0/group
// 配置ZRAM的大小，具体大小需根据产品及需求调整，此处设置为512MB。
echo 512M > /sys/block/zram0/disksize
    Bash

mkswap /dev/block/zram0
swapon /dev/block/zram0
    Bash

echo disable > /proc/sys/kernel/hyperhold/enable
或
echo force_disable > /proc/sys/kernel/hyperhold/enable
    Bash

// 若已经执行过swapon，则需先执行swapoff
swapoff /dev/block/zram0
echo 1 > /sys/block/zram0/reset
    Bash

avail_buffers: 0
min_avail_buffers: 0
high_avail_buffers: 0
free_swap_threshold: 0

memcg score: 300
memcg ub_mem2zram_ratio: 60
memcg ub_zram2ufs_ratio: 10
memcg refault_threshold: 50

zram_wm_ratio: 0

echo 1300 1250 1350 0 > /dev/memcg/memory.avail_buffers
    Bash

IPv4地址长度固定4字节，IPv6地址长度固定16字节。
IPv4网络层报头长度20~60字节，IPv6网络层报头长度40字节。

# kernel/linux/config/linux-5.10/arch/arm64/configs/rk3568_standard_defconfig
CONFIG_NEWIP=y          // 使能New IP内核协议栈
CONFIG_NEWIP_HOOKS=y    // 使能New IP内核侵入式修改插桩函数注册，使能New IP的同时必须使用New IP HOOKS功能
VENDOR_HOOKS=y          // 使能内核插桩基础框架(New IP依赖此配置项，rk3568开发板已默认开启)

find out/ -name *nip*.o
...
out/kernel/OBJ/linux-5.10/net/newip/nip_addrconf_core.o
out/kernel/OBJ/linux-5.10/net/newip/nip_hdr_decap.o
out/kernel/OBJ/linux-5.10/net/newip/nip_addr.o
out/kernel/OBJ/linux-5.10/net/newip/nip_checksum.o
out/kernel/OBJ/linux-5.10/net/newip/tcp_nip_output.o
...

/* 将New IP ehash函数注册到内核 */
register_trace_ninet_ehashfn_hook(&ninet_ehashfn_hook, NULL);


/* 下面是IPv4，IPv6协议栈总入口函数，在总入口函数内新增New IP协议栈相关处理 */
static u32 sk_ehashfn(const struct sock *sk)
{
    /* IPv6 */
#if IS_ENABLED(CONFIG_IPV6)if (sk->sk_family == AF_INET6 &&
	    !ipv6_addr_v4mapped(&sk->sk_v6_daddr))
		return inet6_ehashfn(sock_net(sk),
				     &sk->sk_v6_rcv_saddr, sk->sk_num,
				     &sk->sk_v6_daddr, sk->sk_dport);
#endif

#if IS_ENABLED(CONFIG_NEWIP_HOOKS)if (sk->sk_family == AF_NINET) {
		u32 ret = 0;

        /* New IP注册的ehash函数 */
		trace_ninet_ehashfn_hook(sock_net(sk), &sk->sk_nip_rcv_saddr, sk->sk_num,
					 &sk->sk_nip_daddr, sk->sk_dport, &ret);
		return ret;
	}
#endif

    /* IPv4 */return inet_ehashfn(sock_net(sk),
			    sk->sk_rcv_saddr, sk->sk_num,
			    sk->sk_daddr, sk->sk_dport);
}
    c

# kernel/linux/config/linux-5.10/arch/arm64/configs/rk3568_standard_defconfig
# CONFIG_NEWIP is not set
# CONFIG_NEWIP_HOOKS is not set

enum nip_8bit_addr_index {
	NIP_8BIT_ADDR_INDEX_0 = 0,
	NIP_8BIT_ADDR_INDEX_1 = 1,
	NIP_8BIT_ADDR_INDEX_2 = 2,
	NIP_8BIT_ADDR_INDEX_3 = 3,
	NIP_8BIT_ADDR_INDEX_4 = 4,
	NIP_8BIT_ADDR_INDEX_5 = 5,
	NIP_8BIT_ADDR_INDEX_6 = 6,
	NIP_8BIT_ADDR_INDEX_7 = 7,
	NIP_8BIT_ADDR_INDEX_MAX,
};

enum nip_16bit_addr_index {
	NIP_16BIT_ADDR_INDEX_0 = 0,
	NIP_16BIT_ADDR_INDEX_1 = 1,
	NIP_16BIT_ADDR_INDEX_2 = 2,
	NIP_16BIT_ADDR_INDEX_3 = 3,
	NIP_16BIT_ADDR_INDEX_MAX,
};

enum nip_32bit_addr_index {
	NIP_32BIT_ADDR_INDEX_0 = 0,
	NIP_32BIT_ADDR_INDEX_1 = 1,
	NIP_32BIT_ADDR_INDEX_MAX,
};

#define nip_addr_field8 v.u.field8
#define nip_addr_field16 v.u.field16
#define nip_addr_field32 v.u.field32

#pragma pack(1)
struct nip_addr_field {
	union {
		unsigned char   field8[NIP_8BIT_ADDR_INDEX_MAX];
		unsigned short field16[NIP_16BIT_ADDR_INDEX_MAX]; /* big-endian */unsigned int   field32[NIP_32BIT_ADDR_INDEX_MAX]; /* big-endian */
	} u;
};

struct nip_addr {
	unsigned char bitlen;	/* The address length is in bit (not byte) */struct nip_addr_field v;
};
#pragma pack()

/* The following structure must be larger than V4. System calls use V4.
 * If the definition is smaller than V4, the read process will have memory overruns
 * v4: include\linux\socket.h --> sockaddr (16Byte)
 */
#define POD_SOCKADDR_SIZE 3
struct sockaddr_nin {
	unsigned short sin_family; /* [2Byte] AF_NINET */unsigned short sin_port;   /* [2Byte] Transport layer port, big-endian */struct nip_addr sin_addr;  /* [9Byte] NIP address */

	unsigned char sin_zero[POD_SOCKADDR_SIZE]; /* [3Byte] Byte alignment */
};
    c

# cat /proc/net/nip_addr
01          wlan0
# cat /proc/net/nip_route
02      ff09       1 wlan0        # 到设备2的路由
01      01      2149580801 wlan0  # 本机自发自收路由    sh

# cat /proc/net/nip_addr
02          wlan0
# cat /proc/net/nip_route
01      ff09       1 wlan0        # 到设备1的路由
02      02      2149580801 wlan0  # 本机自发自收路由    sh

服务端shell窗口打印内容：
Received -- 1661826989 498038 NIP_UDP #      0 -- from 0x50:57605
Sending  -- 1661826989 498038 NIP_UDP #      0 -- to 0x50:57605
Received -- 1661826990  14641 NIP_UDP #      1 -- from 0x50:57605
Sending  -- 1661826990  14641 NIP_UDP #      1 -- to 0x50:57605
Received -- 1661826990 518388 NIP_UDP #      2 -- from 0x50:57605
Sending  -- 1661826990 518388 NIP_UDP #      2 -- to 0x50:57605
...
Received -- 1661827011 590576 NIP_UDP #      9 -- from 0x50:37758
Sending  -- 1661827011 590576 NIP_UDP #      9 -- to 0x50:37758

客户端sh窗口打印内容：
Received --1661827007  55221 NIP_UDP #      0 sock 3 success:     1/     1/no=     0
Received --1661827007 557926 NIP_UDP #      1 sock 3 success:     2/     2/no=     1
Received --1661827008  62653 NIP_UDP #      2 sock 3 success:     3/     3/no=     2
...
Received --1661827011 590576 NIP_UDP #      9 sock 3 success:    10/    10/no=     9

服务端shell窗口打印内容：
Received -- 1661760202 560605 NIP_TCP #      0 --:1024
Sending  -- 1661760202 560605 NIP_TCP #      0 --:1024
Received -- 1661760203  69254 NIP_TCP #      1 --:1024
Sending  -- 1661760203  69254 NIP_TCP #      1 --:1024
Received -- 1661760203 571604 NIP_TCP #      2 --:1024
Sending  -- 1661760203 571604 NIP_TCP #      2 --:1024
...
Received -- 1661760207  86544 NIP_TCP #      9 --:1024
Sending  -- 1661760207  86544 NIP_TCP #      9 --:1024

客户端shell窗口打印内容：
Received --1661760202 560605 NIP_TCP #      0 sock 3 success:     1/     1/no=     0
Received --1661760203  69254 NIP_TCP #      1 sock 3 success:     2/     2/no=     1
...
Received --1661760207  86544 NIP_TCP #      9 sock 3 success:    10/    10/no=     9

# base\security\selinux\sepolicy\ohos_policy\xxx\xxx.te
# socket 基础操作
# avc:  denied  { create } for  pid=540 comm="thread_xxx" scontext=u:r:thread_xxx:s0 tcontext=u:r:thread_xxx:s0 tclass=socket permissive=0
allow thread_xxx thread_xxx:socket { create bind connect listen accept read write shutdown setopt getopt };

# ioctl 操作
# 操作码在 linux-xxx\include\uapi\linux\sockios.h 中定义
# 0x8933 : name -> if_index mapping
# 0x8916 : set PA address
# 0x890B : add routing table entry
allowxperm thread_xxx thread_xxx:socket ioctl { 0x8933 0x8916 0x890B };
    sh

New IP报文解析模板存放路径：
D:\tools\WireShark\wireshark_cfg_for_newip.lua

WireShark配置文件路径：
C:\Program Files\Wireshark\init.lua

在init.lua文件最后增加下面配置（window 11）
dofile("D:\\tools\\WireShark\\wireshark_cfg_for_newip.lua")