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bpf: sockmap sample program

Browse source 
This program binds a program to a cgroup and then matches hard
coded IP addresses and adds these to a sockmap.

This will receive messages from the backend and send them to
the client.

     client:X <---> frontend:10000 client:X <---> backend:10001

To keep things simple this is only designed for 1:1 connections
using hard coded values. A more complete example would allow many
backends and clients.

To run,

 # sockmap <cgroup2_dir>

Signed-off-by: John Fastabend <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
John Fastabend 2017-08-15 22:33:32 -07:00 • committed by David S. Miller
commit 69e8cc134b
8 changed files with 547 additions and 6 deletions
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14
tools/lib/bpf/bpf.c
View file

@ -211,20 +211,28 @@ int bpf_obj_get(const char *pathname)
return sys_bpf(BPF_OBJ_GET, &attr, sizeof(attr));
}
int bpf_prog_attach(int prog_fd, int target_fd, enum bpf_attach_type type,
unsigned int flags)
int __bpf_prog_attach(int prog_fd1, int prog_fd2, int target_fd,
enum bpf_attach_type type,
unsigned int flags)
{
union bpf_attr attr;
bzero(&attr, sizeof(attr));
attr.target_fd = target_fd;
attr.attach_bpf_fd = prog_fd;
attr.attach_bpf_fd = prog_fd1;
attr.attach_bpf_fd2 = prog_fd2;
attr.attach_type = type;
attr.attach_flags = flags;
return sys_bpf(BPF_PROG_ATTACH, &attr, sizeof(attr));
}
int bpf_prog_attach(int prog_fd, int target_fd, enum bpf_attach_type type,
unsigned int flags)
{
return __bpf_prog_attach(prog_fd, 0, target_fd, type, flags);
}
int bpf_prog_detach(int target_fd, enum bpf_attach_type type)
{
union bpf_attr attr;

4
tools/lib/bpf/bpf.h
View file

@ -50,6 +50,10 @@ int bpf_obj_pin(int fd, const char *pathname);
int bpf_obj_get(const char *pathname);
int bpf_prog_attach(int prog_fd, int attachable_fd, enum bpf_attach_type type,
unsigned int flags);
int __bpf_prog_attach(int prog1, int prog2,
int attachable_fd,
enum bpf_attach_type type,
unsigned int flags);
int bpf_prog_detach(int attachable_fd, enum bpf_attach_type type);
int bpf_prog_test_run(int prog_fd, int repeat, void *data, __u32 size,
void *data_out, __u32 *size_out, __u32 *retval,