I have a question involving the userspace and kernel communication.
I need to get a point where I can exchange data between netgraph nodes and a
program in the userland.
I have a netgraph node which receives network packets and sends them to the
program to be processed. The modified packets are then sent back to the same
node.
I thought to do it with the ng_socket node type. I’ve written a program that
creates two sockets (data and control) as reported in “All about netgraph”.
Then I’ve tried to assign the node a name with bind(), as follow:
#include <stdio.h>
#include <errno.h>
#include <netdb.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <ctype.h>
#include <err.h>
#include <stddef.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netgraph/ng_socket.h>
#define NGSA_OVERHEAD (offsetof(struct sockaddr_ng, sg_data))
int
main()
{
int s_control = -1, s_data = -1;
struct sockaddr_ng *sg;
s_control = socket(PF_NETGRAPH,SOCK_DGRAM,NG_CONTROL);
strcpy(sg->sg_data,"SOCKET");
sg->sg_family = AF_NETGRAPH;
sg->sg_len = strlen(sg->sg_data) + 1 + NGSA_OVERHEAD;
bind(s_control,(struct sockaddr *)sg,sg->sg_len)<0);
…
return 0;
}
If I look at ngctl to verify the ng_socket creation, no trace of it can be
found.
So I don't know how to proceed .. any suggestion?
Thank you,
Serena
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