Previously, if we attach more than filters for one netdev, IN/OUT traffic pass
through filters in the a same order.
ingress: netdev ->filter1 ->filter2 ->...filter[n] ->emulated device
outgress: emulated device ->filter1 ->filter2 ->...filter[n] ->netdev.
But some scenes, we hope filters handle the outgress traffic in a reverse order.
For example, in colo-proxy(will be implemented later), we have a redirector
filter and a colo-rewriter filter, we need the filter behavior like that:
ingress(->)/outgress(<-): <->redirector <->colo-rewriter <->emulated device
After this changes, outgress traffic always pass through filters in a reverse
order.
Signed-off-by: Wen Congyang <address@hidden>
Signed-off-by: Li Zhijian <address@hidden>
---
include/net/net.h | 4 +++-
net/filter.c | 21 +++++++++++++++++++--
net/net.c | 20 +++++++++++++++-----
3 files changed, 37 insertions(+), 8 deletions(-)
diff --git a/include/net/net.h b/include/net/net.h
index 7af3e15..1d807cc 100644
--- a/include/net/net.h
+++ b/include/net/net.h
@@ -79,6 +79,8 @@ typedef struct NetClientInfo {
SetVnetBE *set_vnet_be;
} NetClientInfo;
+QTAILQ_HEAD(NetFilterHead, NetFilterState);
+
struct NetClientState {
NetClientInfo *info;
int link_down;
@@ -92,7 +94,7 @@ struct NetClientState {
NetClientDestructor *destructor;
unsigned int queue_index;
unsigned rxfilter_notify_enabled:1;
- QTAILQ_HEAD(, NetFilterState) filters;
+ struct NetFilterHead filters;
};
typedef struct NICState {
diff --git a/net/filter.c b/net/filter.c
index 5d90f83..17a8398 100644
--- a/net/filter.c
+++ b/net/filter.c
@@ -34,6 +34,22 @@ ssize_t qemu_netfilter_receive(NetFilterState *nf,
return 0;
}
+static NetFilterState *netfilter_next(NetFilterState *nf,
+ NetFilterDirection dir)
+{
+ NetFilterState *next;
+
+ if (dir == NET_FILTER_DIRECTION_TX) {
+ /* forward walk through filters */
+ next = QTAILQ_NEXT(nf, next);
+ } else {
+ /* reverse order */
+ next = QTAILQ_PREV(nf, NetFilterHead, next);
+ }
+
+ return next;
+}
+
ssize_t qemu_netfilter_pass_to_next(NetClientState *sender,
unsigned flags,
const struct iovec *iov,
@@ -43,7 +59,7 @@ ssize_t qemu_netfilter_pass_to_next(NetClientState *sender,
int ret = 0;
int direction;
NetFilterState *nf = opaque;
- NetFilterState *next = QTAILQ_NEXT(nf, next);
+ NetFilterState *next = NULL;
if (!sender || !sender->peer) {
/* no receiver, or sender been deleted, no need to pass it further */
@@ -61,6 +77,7 @@ ssize_t qemu_netfilter_pass_to_next(NetClientState *sender,
direction = nf->direction;
}
+ next = netfilter_next(nf, direction);
while (next) {
/*
* if qemu_netfilter_pass_to_next been called, means that
@@ -73,7 +90,7 @@ ssize_t qemu_netfilter_pass_to_next(NetClientState *sender,
if (ret) {
return ret;
}
- next = QTAILQ_NEXT(next, next);
+ next = netfilter_next(next, direction);
}
/*
diff --git a/net/net.c b/net/net.c
index 87dd356..c929c41 100644
--- a/net/net.c
+++ b/net/net.c
@@ -580,11 +580,21 @@ static ssize_t filter_receive_iov(NetClientState *nc,
ssize_t ret = 0;
NetFilterState *nf = NULL;
- QTAILQ_FOREACH(nf, &nc->filters, next) {
- ret = qemu_netfilter_receive(nf, direction, sender, flags, iov,
- iovcnt, sent_cb);
- if (ret) {
- return ret;
+ if (direction == NET_FILTER_DIRECTION_TX) {
+ QTAILQ_FOREACH(nf, &nc->filters, next) {
+ ret = qemu_netfilter_receive(nf, direction, sender, flags, iov,
+ iovcnt, sent_cb);
+ if (ret) {
+ return ret;
+ }
+ }
+ } else {
+ QTAILQ_FOREACH_REVERSE(nf, &nc->filters, NetFilterHead, next) {
+ ret = qemu_netfilter_receive(nf, direction, sender, flags, iov,
+ iovcnt, sent_cb);
+ if (ret) {
+ return ret;
+ }
}
}