[Qemu-devel] [PATCH v3 07/12] netfilter: add an API to pass the packet to next filter

[Yang Hongyang <yanghy@cn.fujitsu.com>]

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 <yanghy@cn.fujitsu.com>
---
 include/net/filter.h | 12 ++++++++++++
 include/net/net.h    |  1 +
 net/filter.c         | 31 +++++++++++++++++++++++++++++++
 net/net.c            | 13 +++++++++++++
 4 files changed, 57 insertions(+)

diff --git a/include/net/filter.h b/include/net/filter.h
index 7f0c949..c2be970 100644
--- a/include/net/filter.h
+++ b/include/net/filter.h
@@ -53,4 +53,16 @@ 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/include/net/net.h b/include/net/net.h
index 5c5c109..d3bfe12 100644
--- a/include/net/net.h
+++ b/include/net/net.h
@@ -117,6 +117,7 @@ NetClientState *qemu_new_net_client(NetClientInfo *info,
                                     const char *name);
 int qemu_netdev_add_filter(NetClientState *nc, NetFilterState *nf);
 void qemu_netdev_remove_filter(NetClientState *nc, NetFilterState *nf);
+NetFilterState *qemu_netdev_next_filter(NetClientState *nc, NetFilterState *nf);
 NICState *qemu_new_nic(NetClientInfo *info,
                        NICConf *conf,
                        const char *model,
diff --git a/net/filter.c b/net/filter.c
index bf113e9..84845b1 100644
--- a/net/filter.c
+++ b/net/filter.c
@@ -131,6 +131,37 @@ 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)
+{
+    NetFilterState *next = qemu_netdev_next_filter(nf->netdev, nf);
+
+    while (next) {
+        if (next->chain == nf->chain || next->chain == NET_FILTER_ALL) {
+            next->info->receive_iov(next, sender, flags, iov, iovcnt);
+            return;
+        }
+        next = qemu_netdev_next_filter(next->netdev, next);
+    }
+}
+
+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);
diff --git a/net/net.c b/net/net.c
index f774c39..e087763 100644
--- a/net/net.c
+++ b/net/net.c
@@ -339,6 +339,19 @@ void qemu_netdev_remove_filter(NetClientState *nc, NetFilterState *nf)
     remove_filter(nc, filter);
 }
 
+NetFilterState *qemu_netdev_next_filter(NetClientState *nc, NetFilterState *nf)
+{
+    Filter *filter = NULL;
+
+    QTAILQ_FOREACH(filter, &nc->filters, next) {
+        if (filter->nf == nf) {
+            break;
+        }
+    }
+
+    return QTAILQ_NEXT(filter, next)->nf;
+}
+
 NICState *qemu_new_nic(NetClientInfo *info,
                        NICConf *conf,
                        const char *model,
-- 
1.9.1