[Qemu-devel] [PATCH v4 06/11] netfilter: add an API to pass the packet to next filter

[Yang Hongyang]

add an API qemu_netfilter_pass_to_next_iov() to pass the packet
to next filter, and a wrapper qemu_netfilter_pass_to_next().

Signed-off-by: Yang Hongyang <yan...@cn.fujitsu.com>
---
 include/net/filter.h | 12 ++++++++++++
 net/filter.c         | 43 +++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 55 insertions(+)

diff --git a/include/net/filter.h b/include/net/filter.h
index c146be2..867d5aa 100644
--- a/include/net/filter.h
+++ b/include/net/filter.h
@@ -54,4 +54,16 @@ void qemu_del_net_filter(NetFilterState *nf);
 void netfilter_add(QemuOpts *opts, Error **errp);
 void qmp_netfilter_add(QDict *qdict, QObject **ret, Error **errp);
 
+/* pass the packet to the next filter */
+void qemu_netfilter_pass_to_next_iov(NetFilterState *nf,
+                                     NetClientState *sender,
+                                     unsigned flags,
+                                     const struct iovec *iov,
+                                     int iovcnt);
+void qemu_netfilter_pass_to_next(NetFilterState *nf,
+                                 NetClientState *sender,
+                                 unsigned flags,
+                                 const uint8_t *data,
+                                 size_t size);
+
 #endif /* QEMU_NET_FILTER_H */
diff --git a/net/filter.c b/net/filter.c
index 24ec4e1..166b851 100644
--- a/net/filter.c
+++ b/net/filter.c
@@ -14,9 +14,11 @@
 #include "qapi/dealloc-visitor.h"
 #include "qemu/config-file.h"
 #include "qmp-commands.h"
+#include "qemu/iov.h"
 
 #include "net/filter.h"
 #include "net/net.h"
+#include "net/queue.h"
 
 static QTAILQ_HEAD(, NetFilterState) net_filters;
 
@@ -130,6 +132,47 @@ void qmp_netfilter_del(const char *id, Error **errp)
     qemu_opts_del(opts);
 }
 
+void qemu_netfilter_pass_to_next_iov(NetFilterState *nf,
+                                     NetClientState *sender,
+                                     unsigned flags,
+                                     const struct iovec *iov,
+                                     int iovcnt)
+{
+    int ret = 0;
+    ssize_t size = iov_size(iov, iovcnt);
+    NetFilterState *next = QTAILQ_NEXT(nf, next);
+
+    while (next) {
+        if (next->chain == nf->chain || next->chain == NET_FILTER_ALL) {
+            ret = next->info->receive_iov(next, sender, flags, iov, iovcnt);
+            if (ret == size) {
+                return;
+            }
+        }
+        next = QTAILQ_NEXT(next, next);
+    }
+
+    /* we have gone through all filters, pass it to receiver */
+    if (sender && sender->peer) {
+        qemu_net_queue_send_iov(sender->peer->incoming_queue, sender, flags,
+                                iov, iovcnt, NULL);
+    }
+}
+
+void qemu_netfilter_pass_to_next(NetFilterState *nf,
+                                 NetClientState *sender,
+                                 unsigned flags,
+                                 const uint8_t *data,
+                                 size_t size)
+{
+    struct iovec iov = {
+        .iov_base = (void *)data,
+        .iov_len = size
+    };
+
+    return qemu_netfilter_pass_to_next_iov(nf, sender, flags, &iov, 1);
+}
+
 typedef int (NetFilterInit)(const NetFilterOptions *opts,
                             const char *name, int chain,
                             NetClientState *netdev, Error **errp);
-- 
1.9.1