samples/bpf: Add support for SKB_MODE to xdp1 and xdp_tx_iptunnel
Add option to xdp1 and xdp_tx_iptunnel to insert xdp program in
SKB_MODE:
- update set_link_xdp_fd to take a flags argument that is added to the
RTM_SETLINK message
- Add -S option to xdp1 and xdp_tx_iptunnel user code. When passed in
XDP_FLAGS_SKB_MODE is set in the flags arg passed to set_link_xdp_fd
Signed-off-by: David Ahern <dsa@cumulusnetworks.com>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/samples/bpf/bpf_load.c b/samples/bpf/bpf_load.c
index 0d449d8..d4433a4 100644
--- a/samples/bpf/bpf_load.c
+++ b/samples/bpf/bpf_load.c
@@ -563,7 +563,7 @@ struct ksym *ksym_search(long key)
return &syms[0];
}
-int set_link_xdp_fd(int ifindex, int fd)
+int set_link_xdp_fd(int ifindex, int fd, int flags)
{
struct sockaddr_nl sa;
int sock, seq = 0, len, ret = -1;
@@ -599,15 +599,28 @@ int set_link_xdp_fd(int ifindex, int fd)
req.nh.nlmsg_seq = ++seq;
req.ifinfo.ifi_family = AF_UNSPEC;
req.ifinfo.ifi_index = ifindex;
+
+ /* started nested attribute for XDP */
nla = (struct nlattr *)(((char *)&req)
+ NLMSG_ALIGN(req.nh.nlmsg_len));
nla->nla_type = NLA_F_NESTED | 43/*IFLA_XDP*/;
+ nla->nla_len = NLA_HDRLEN;
- nla_xdp = (struct nlattr *)((char *)nla + NLA_HDRLEN);
+ /* add XDP fd */
+ nla_xdp = (struct nlattr *)((char *)nla + nla->nla_len);
nla_xdp->nla_type = 1/*IFLA_XDP_FD*/;
nla_xdp->nla_len = NLA_HDRLEN + sizeof(int);
memcpy((char *)nla_xdp + NLA_HDRLEN, &fd, sizeof(fd));
- nla->nla_len = NLA_HDRLEN + nla_xdp->nla_len;
+ nla->nla_len += nla_xdp->nla_len;
+
+ /* if user passed in any flags, add those too */
+ if (flags) {
+ nla_xdp = (struct nlattr *)((char *)nla + nla->nla_len);
+ nla_xdp->nla_type = 3/*IFLA_XDP_FLAGS*/;
+ nla_xdp->nla_len = NLA_HDRLEN + sizeof(flags);
+ memcpy((char *)nla_xdp + NLA_HDRLEN, &flags, sizeof(flags));
+ nla->nla_len += nla_xdp->nla_len;
+ }
req.nh.nlmsg_len += NLA_ALIGN(nla->nla_len);
