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The following three files are added:
  libbpf_probes.c
  libbpf_util.h
  libbpf.map

Signed-off-by: Yonghong Song <yhs@fb.com>
This commit is contained in:
Yonghong Song
2019-02-04 13:28:44 -08:00
parent d5b146fec5
commit 1dc0296fce
11 changed files with 798 additions and 177 deletions
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85
src/netlink.c
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@@ -21,6 +21,12 @@
typedef int (*__dump_nlmsg_t)(struct nlmsghdr *nlmsg, libbpf_dump_nlmsg_t,
void *cookie);
struct xdp_id_md {
int ifindex;
__u32 flags;
__u32 id;
};
int libbpf_netlink_open(__u32 *nl_pid)
{
struct sockaddr_nl sa;
@@ -196,6 +202,85 @@ static int __dump_link_nlmsg(struct nlmsghdr *nlh,
return dump_link_nlmsg(cookie, ifi, tb);
}
static unsigned char get_xdp_id_attr(unsigned char mode, __u32 flags)
{
if (mode != XDP_ATTACHED_MULTI)
return IFLA_XDP_PROG_ID;
if (flags & XDP_FLAGS_DRV_MODE)
return IFLA_XDP_DRV_PROG_ID;
if (flags & XDP_FLAGS_HW_MODE)
return IFLA_XDP_HW_PROG_ID;
if (flags & XDP_FLAGS_SKB_MODE)
return IFLA_XDP_SKB_PROG_ID;
return IFLA_XDP_UNSPEC;
}
static int get_xdp_id(void *cookie, void *msg, struct nlattr **tb)
{
struct nlattr *xdp_tb[IFLA_XDP_MAX + 1];
struct xdp_id_md *xdp_id = cookie;
struct ifinfomsg *ifinfo = msg;
unsigned char mode, xdp_attr;
int ret;
if (xdp_id->ifindex && xdp_id->ifindex != ifinfo->ifi_index)
return 0;
if (!tb[IFLA_XDP])
return 0;
ret = libbpf_nla_parse_nested(xdp_tb, IFLA_XDP_MAX, tb[IFLA_XDP], NULL);
if (ret)
return ret;
if (!xdp_tb[IFLA_XDP_ATTACHED])
return 0;
mode = libbpf_nla_getattr_u8(xdp_tb[IFLA_XDP_ATTACHED]);
if (mode == XDP_ATTACHED_NONE)
return 0;
xdp_attr = get_xdp_id_attr(mode, xdp_id->flags);
if (!xdp_attr || !xdp_tb[xdp_attr])
return 0;
xdp_id->id = libbpf_nla_getattr_u32(xdp_tb[xdp_attr]);
return 0;
}
int bpf_get_link_xdp_id(int ifindex, __u32 *prog_id, __u32 flags)
{
struct xdp_id_md xdp_id = {};
int sock, ret;
__u32 nl_pid;
__u32 mask;
if (flags & ~XDP_FLAGS_MASK)
return -EINVAL;
/* Check whether the single {HW,DRV,SKB} mode is set */
flags &= (XDP_FLAGS_SKB_MODE | XDP_FLAGS_DRV_MODE | XDP_FLAGS_HW_MODE);
mask = flags - 1;
if (flags && flags & mask)
return -EINVAL;
sock = libbpf_netlink_open(&nl_pid);
if (sock < 0)
return sock;
xdp_id.ifindex = ifindex;
xdp_id.flags = flags;
ret = libbpf_nl_get_link(sock, nl_pid, get_xdp_id, &xdp_id);
if (!ret)
*prog_id = xdp_id.id;
close(sock);
return ret;
}
int libbpf_nl_get_link(int sock, unsigned int nl_pid,
libbpf_dump_nlmsg_t dump_link_nlmsg, void *cookie)
{