[RFC PATCH 10/12] net/filter-ubpf.c: run the ubpf program to handle network packet

[Zhang Chen]

Run the loaded userspace ebpf program with the packet.

Signed-off-by: Zhang Chen <chen.zh...@intel.com>
---
 net/filter-ubpf.c | 40 ++++++++++++++++++++++++++++++++++++++--
 1 file changed, 38 insertions(+), 2 deletions(-)

diff --git a/net/filter-ubpf.c b/net/filter-ubpf.c
index c63a021759..554cc24d8f 100644
--- a/net/filter-ubpf.c
+++ b/net/filter-ubpf.c
@@ -20,6 +20,8 @@
 #include "qemu/error-report.h"
 #include "trace.h"
 #include "ebpf/ubpf.h"
+#include "colo.h"
+#include "util.h"
 
 #define TYPE_FILTER_UBPF "filter-ubpf"
 OBJECT_DECLARE_SIMPLE_TYPE(FiliterUbpfState, FILTER_UBPF)
@@ -38,9 +40,43 @@ static ssize_t filter_ubpf_receive_iov(NetFilterState *nf,
                                        int iovcnt,
                                        NetPacketSent *sent_cb)
 {
-    /* TODO: handle packet by loaded userspace ebpf program */
+    FiliterUbpfState *s = FILTER_UBPF(nf);
+    size_t size;
+    char *buf;
+    Packet *pkt = NULL;
+    uint64_t result;
+
+    size = iov_size(iov, iovcnt);
+    if (!size) {
+        return 0;
+    }
+
+    buf = g_malloc(size);
+    if (unlikely(iov_to_buf(iov, iovcnt, 0, buf, size) != size)) {
+        g_free(buf);
+        return 0;
+    }
+
+    pkt = packet_new_nocopy(buf, size, 0);
 
-    return 0;
+    if (parse_packet_early(pkt)) {
+        packet_destroy(pkt, NULL);
+        pkt = NULL;
+        return 0;
+    }
+
+    if (s->ip_mode) {
+        result = qemu_ubpf_run_once(&s->ubpf, pkt->ip, sizeof(struct ip));
+    } else {
+        result = qemu_ubpf_run_once(&s->ubpf, pkt->data, pkt->size);
+    }
+
+    /* If result == 1, means trigger the ebpf program rules */
+    if (result) {
+        return -1;
+    } else {
+        return 0;
+    }
 }
 
 static void filter_ubpf_cleanup(NetFilterState *nf)
-- 
2.25.1