我正在向mock交换机发送LLDP数据包，因为我正在测试一些DCB设置，我可以看到数据包在tcpdump中发出，但我看不到它到达链接伙伴。我的代码：
#include <stdio.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <linux/if_packet.h>
#include <net/ethernet.h>
#include <string.h>
#include <net/if.h>
#include <errno.h>
#include <sys/ioctl.h>
int main() {
char buf[414] = {0x01, 0x80, 0xc2, 0x00, 0x00, 0x0e, 0xb4, 0x96, 0x91, 0x94, 0xaa, 0x25, 0x88, 0xcc, 0x02, 0x07,
0x04, 0x4c, 0x76, 0x25, 0xee, 0xd3, 0x40, 0x04, 0x11, 0x05, 0x68, 0x75, 0x6e, 0x64, 0x72, 0x65,
0x64, 0x47, 0x69, 0x67, 0x45, 0x20, 0x31, 0x2f, 0x32, 0x34, 0x06, 0x02, 0x00, 0x78, 0x0a, 0x0a,
0x5a, 0x39, 0x31, 0x30, 0x30, 0x2d, 0x4f, 0x4e, 0x36, 0x31, 0x0c, 0xd6, 0x44, 0x65, 0x6c, 0x6c,
0x20, 0x52, 0x65, 0x61, 0x6c, 0x20, 0x54, 0x69, 0x6d, 0x65, 0x20, 0x4f, 0x70, 0x65, 0x72, 0x61,
0x74, 0x69, 0x6e, 0x67, 0x20, 0x53, 0x79, 0x73, 0x74, 0x65, 0x6d, 0x20, 0x53, 0x6f, 0x66, 0x74,
0x77, 0x61, 0x72, 0x65, 0x2e, 0x20, 0x44, 0x65, 0x6c, 0x6c, 0x20, 0x4f, 0x70, 0x65, 0x72, 0x61,
0x74, 0x69, 0x6e, 0x67, 0x20, 0x53, 0x79, 0x73, 0x74, 0x65, 0x6d, 0x20, 0x56, 0x65, 0x72, 0x73,
0x69, 0x6f, 0x6e, 0x3a, 0x20, 0x32, 0x2e, 0x30, 0x2e, 0x20, 0x44, 0x65, 0x6c, 0x6c, 0x20, 0x41,
0x70, 0x70, 0x6c, 0x69, 0x63, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x20, 0x53, 0x6f, 0x66, 0x74, 0x77,
0x61, 0x72, 0x65, 0x20, 0x56, 0x65, 0x72, 0x73, 0x69, 0x6f, 0x6e, 0x3a, 0x20, 0x39, 0x2e, 0x31,
0x31, 0x28, 0x30, 0x2e, 0x30, 0x50, 0x36, 0x29, 0x20, 0x43, 0x6f, 0x70, 0x79, 0x72, 0x69, 0x67,
0x68, 0x74, 0x20, 0x28, 0x63, 0x29, 0x20, 0x31, 0x39, 0x39, 0x39, 0x2d, 0x32, 0x30, 0x31, 0x37,
0x44, 0x65, 0x6c, 0x6c, 0x20, 0x49, 0x6e, 0x63, 0x2e, 0x20, 0x41, 0x6c, 0x6c, 0x20, 0x52, 0x69,
0x67, 0x68, 0x74, 0x73, 0x20, 0x52, 0x65, 0x73, 0x65, 0x72, 0x76, 0x65, 0x64, 0x2e, 0x42, 0x75,
0x69, 0x6c, 0x64, 0x20, 0x54, 0x69, 0x6d, 0x65, 0x3a, 0x20, 0x4d, 0x6f, 0x6e, 0x20, 0x46, 0x65,
0x62, 0x20, 0x32, 0x37, 0x20, 0x31, 0x36, 0x3a, 0x35, 0x37, 0x3a, 0x32, 0x30, 0x20, 0x32, 0x30,
0x31, 0x37, 0x0e, 0x04, 0x00, 0x16, 0x00, 0x16, 0x10, 0x0c, 0x05, 0x01, 0x0a, 0xed, 0x5f, 0x37,
0x02, 0x00, 0x90, 0x00, 0x01, 0x00, 0xfe, 0x06, 0x00, 0x80, 0xc2, 0x0b, 0x08, 0x18, 0xfe, 0x19,
0x00, 0x80, 0xc2, 0x09, 0x07, 0x12, 0x34, 0x56, 0x70, 0x0d, 0x0d, 0x0d, 0x0d, 0x0c, 0x0c, 0x0c,
0x0c, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0xfe, 0x19, 0x00, 0x80, 0xc2, 0x0a, 0x00,
0x01, 0x23, 0x45, 0x67, 0x0d, 0x0d, 0x0d, 0x0d, 0x0c, 0x0c, 0x0c, 0x0c, 0x02, 0x02, 0x02, 0x02,
0x02, 0x02, 0x02, 0x02, 0xfe, 0x0e, 0x00, 0x80, 0xc2, 0x0c, 0x00, 0x61, 0x89, 0x06, 0x61, 0x89,
0x14, 0x82, 0x0c, 0xbc, 0x00, 0x00};
struct ifreq ifr;
strncpy((char *)ifr.ifr_name, "eth1", IFNAMSIZ);
int sock_r = socket(AF_PACKET,SOCK_RAW,htons(ETH_P_ALL));
if (sock_r < 0)
printf("socket errno: %sn", strerror(errno));
if (ioctl(sock_r, SIOCGIFINDEX, &ifr))
printf("ioctl errno: %sn", strerror(errno));
struct sockaddr_ll sll = {.sll_family = AF_PACKET, .sll_ifindex = ifr.ifr_ifindex};
if(sendto(sock_r, buf, sizeof(buf), 0, (struct sockaddr *) &sll, sizeof(sll)))
printf("sendto errno: %sn", strerror(errno));
close(sock_r);
return 0;
}
在tcpdump中，我看到：
13:40:33.472198 LLDP, length 400
Chassis ID TLV (1), length 7
Subtype MAC address (4): 4c:76:25:ee:d3:40
0x0000: 044c 7625 eed3 40
Port ID TLV (2), length 17
Subtype Interface Name (5): hundredGigE 1/24
0x0000: 0568 756e 6472 6564 4769 6745 2031 2f32
0x0010: 34
Time to Live TLV (3), length 2: TTL 120s
0x0000: 0078
System Name TLV (5), length 10: Z9100-ON61
0x0000: 5a39 3130 302d 4f4e 3631
System Description TLV (6), length 214
Dell Real Time Operating System Software. Dell Operating System Version: 2.0. Dell Application Software Version: 9.11(0.0P6) Copyright (c) 1999-2017Dell Inc. All Rights Reserved.Build Time: Mon Feb 27 16:57:20 2017
0x0000: 4465 6c6c 2052 6561 6c20 5469 6d65 204f
0x0010: 7065 7261 7469 6e67 2053 7973 7465 6d20
0x0020: 536f 6674 7761 7265 2e20 4465 6c6c 204f
0x0030: 7065 7261 7469 6e67 2053 7973 7465 6d20
0x0040: 5665 7273 696f 6e3a 2032 2e30 2e20 4465
0x0050: 6c6c 2041 7070 6c69 6361 7469 6f6e 2053
0x0060: 6f66 7477 6172 6520 5665 7273 696f 6e3a
0x0070: 2039 2e31 3128 302e 3050 3629 2043 6f70
0x0080: 7972 6967 6874 2028 6329 2031 3939 392d
0x0090: 3230 3137 4465 6c6c 2049 6e63 2e20 416c
0x00a0: 6c20 5269 6768 7473 2052 6573 6572 7665
0x00b0: 642e 4275 696c 6420 5469 6d65 3a20 4d6f
0x00c0: 6e20 4665 6220 3237 2031 363a 3537 3a32
0x00d0: 3020 3230 3137
System Capabilities TLV (7), length 4
System Capabilities [Repeater, Bridge, Router] (0x0016)
Enabled Capabilities [Repeater, Bridge, Router] (0x0016)
0x0000: 0016 0016
Management Address TLV (8), length 12
Management Address length 5, AFI IPv4 (1): 10.237.95.55
Interface Index Interface Numbering (2): 9437185
0x0000: 0501 0aed 5f37 0200 9000 0100
Organization specific TLV (127), length 6: OUI Ethernet bridged (0x0080c2)
Priority Flow Control Configuration Subtype (11)
Willing: 0, MBC: 0, RES: 0, PFC cap:8
PFC Enable
Priority : 0 1 2 3 4 5 6 7
Value : 0 0 0 1 1 0 0 0
0x0000: 0080 c20b 0818
Organization specific TLV (127), length 25: OUI Ethernet bridged (0x0080c2)
ETS Configuration Subtype (9)
Willing:0, CBS:0, RES:0, Max TCs:7
Priority Assignment Table
Priority : 0 1 2 3 4 5 6 7
Value : 1 2 3 4 5 6 7 0
TC Bandwidth Table
TC% : 0 1 2 3 4 5 6 7
Value : 13 13 13 13 12 12 12 12
TSA Assignment Table
Traffic Class: 0 1 2 3 4 5 6 7
Value : 2 2 2 2 2 2 2 2
0x0000: 0080 c209 0712 3456 700d 0d0d 0d0c 0c0c
0x0010: 0c02 0202 0202 0202 02
Organization specific TLV (127), length 25: OUI Ethernet bridged (0x0080c2)
ETS Recommendation Subtype (10)
RES: 0
Priority Assignment Table
Priority : 0 1 2 3 4 5 6 7
Value : 0 1 2 3 4 5 6 7
TC Bandwidth Table
TC% : 0 1 2 3 4 5 6 7
Value : 13 13 13 13 12 12 12 12
TSA Assignment Table
Traffic Class: 0 1 2 3 4 5 6 7
Value : 2 2 2 2 2 2 2 2
0x0000: 0080 c20a 0001 2345 670d 0d0d 0d0c 0c0c
0x0010: 0c02 0202 0202 0202 02
Organization specific TLV (127), length 14: OUI Ethernet bridged (0x0080c2)
Application Priority Subtype (12)
RES: 0
Application Priority Table
Priority: 3, RES: 0, Sel: 1, Protocol ID: 24969
Priority: 3, RES: 0, Sel: 1, Protocol ID: 24969
Priority: 4, RES: 0, Sel: 2, Protocol ID: 33292
0x0000: 0080 c20c 0061 8906 6189 1482 0cbc
End TLV (0), length 0
例如，我应该在原始套接字道具中设置一些东西，或者在驱动程序中启用一些东西，还是它是特定于供应商的，而我正处于困境？
原来是硬件特定的问题。显然，出于安全原因，一些设备不支持传输伪造的LLDP帧。将适配器更改为Niantic有效。