Commit 5dc880de authored by Joe Stringer's avatar Joe Stringer Committed by Arnaldo Carvalho de Melo

tools lib bpf: Add bpf_prog_{attach,detach}

Commit d8c5b17f ("samples: bpf: add userspace example for attaching
eBPF programs to cgroups") added these functions to samples/libbpf, but
during this merge all of the samples libbpf functionality is shifting to
tools/lib/bpf. Shift these functions there.

Committer notes:

Use bzero + attr.FIELD = value instead of 'attr = { .FIELD = value, just
like the other wrapper calls to sys_bpf with bpf_attr to make this build
in older toolchais, such as the ones in CentOS 5 and 6.
Signed-off-by: default avatarJoe Stringer <joe@ovn.org>
Cc: Alexei Starovoitov <ast@fb.com>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/n/tip-au2zvtsh55vqeo3v3uw7jr4c@git.kernel.org
Link: https://github.com/joestringer/linux/commit/353e6f298c3d0a92fa8bfa61ff898c5050261a12.patchSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 43371c83
...@@ -11,27 +11,6 @@ ...@@ -11,27 +11,6 @@
#include <arpa/inet.h> #include <arpa/inet.h>
#include "libbpf.h" #include "libbpf.h"
int bpf_prog_attach(int prog_fd, int target_fd, enum bpf_attach_type type)
{
union bpf_attr attr = {
.target_fd = target_fd,
.attach_bpf_fd = prog_fd,
.attach_type = type,
};
return syscall(__NR_bpf, BPF_PROG_ATTACH, &attr, sizeof(attr));
}
int bpf_prog_detach(int target_fd, enum bpf_attach_type type)
{
union bpf_attr attr = {
.target_fd = target_fd,
.attach_type = type,
};
return syscall(__NR_bpf, BPF_PROG_DETACH, &attr, sizeof(attr));
}
int open_raw_sock(const char *name) int open_raw_sock(const char *name)
{ {
struct sockaddr_ll sll; struct sockaddr_ll sll;
......
...@@ -6,9 +6,6 @@ ...@@ -6,9 +6,6 @@
struct bpf_insn; struct bpf_insn;
int bpf_prog_attach(int prog_fd, int attachable_fd, enum bpf_attach_type type);
int bpf_prog_detach(int attachable_fd, enum bpf_attach_type type);
/* ALU ops on registers, bpf_add|sub|...: dst_reg += src_reg */ /* ALU ops on registers, bpf_add|sub|...: dst_reg += src_reg */
#define BPF_ALU64_REG(OP, DST, SRC) \ #define BPF_ALU64_REG(OP, DST, SRC) \
......
...@@ -167,3 +167,26 @@ int bpf_obj_get(const char *pathname) ...@@ -167,3 +167,26 @@ int bpf_obj_get(const char *pathname)
return sys_bpf(BPF_OBJ_GET, &attr, sizeof(attr)); return sys_bpf(BPF_OBJ_GET, &attr, sizeof(attr));
} }
int bpf_prog_attach(int prog_fd, int target_fd, enum bpf_attach_type type)
{
union bpf_attr attr;
bzero(&attr, sizeof(attr));
attr.target_fd = target_fd;
attr.attach_bpf_fd = prog_fd;
attr.attach_type = type;
return sys_bpf(BPF_PROG_ATTACH, &attr, sizeof(attr));
}
int bpf_prog_detach(int target_fd, enum bpf_attach_type type)
{
union bpf_attr attr;
bzero(&attr, sizeof(attr));
attr.target_fd = target_fd;
attr.attach_type = type;
return sys_bpf(BPF_PROG_DETACH, &attr, sizeof(attr));
}
...@@ -41,5 +41,8 @@ int bpf_map_delete_elem(int fd, void *key); ...@@ -41,5 +41,8 @@ int bpf_map_delete_elem(int fd, void *key);
int bpf_map_get_next_key(int fd, void *key, void *next_key); int bpf_map_get_next_key(int fd, void *key, void *next_key);
int bpf_obj_pin(int fd, const char *pathname); int bpf_obj_pin(int fd, const char *pathname);
int bpf_obj_get(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);
int bpf_prog_detach(int attachable_fd, enum bpf_attach_type type);
#endif #endif
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