From 0a4227a47721e47e868e87c4cd6a431ee3d98fce Mon Sep 17 00:00:00 2001
From: Ben Pfaff <blp@nicira.com>
Date: Mon, 2 Mar 2009 11:09:13 -0800
Subject: [PATCH] vconn: New function check_ofp_packet_out().

---
 lib/vconn.c | 44 ++++++++++++++++++++++++++++++++++++++++++++
 lib/vconn.h |  2 ++
 2 files changed, 46 insertions(+)

diff --git a/lib/vconn.c b/lib/vconn.c
index 1dec3073..c7342d24 100644
--- a/lib/vconn.c
+++ b/lib/vconn.c
@@ -1088,6 +1088,50 @@ check_ofp_message_array(const struct ofp_header *msg, uint8_t type,
     return 0;
 }
 
+int
+check_ofp_packet_out(const struct ofp_header *oh, struct ofpbuf *data,
+                     int *n_actionsp)
+{
+    const struct ofp_packet_out *opo;
+    unsigned int actions_len, n_actions;
+    size_t extra;
+    int error;
+
+    *n_actionsp = 0;
+    error = check_ofp_message_array(oh, OFPT_PACKET_OUT,
+                                    sizeof *opo, 1, &extra);
+    if (error) {
+        return error;
+    }
+    opo = (const struct ofp_packet_out *) oh;
+
+    actions_len = ntohs(opo->actions_len);
+    if (actions_len > extra) {
+        VLOG_WARN_RL(&bad_ofmsg_rl, "packet-out claims %zu bytes of actions "
+                     "but message has room for only %zu bytes",
+                     actions_len, extra);
+        return ofp_mkerr(OFPET_BAD_REQUEST, OFPBRC_BAD_LENGTH);
+    }
+    if (actions_len % sizeof(union ofp_action)) {
+        VLOG_WARN_RL(&bad_ofmsg_rl, "packet-out claims %zu bytes of actions, "
+                     "which is not a multiple of %zu",
+                     actions_len, sizeof(union ofp_action));
+        return ofp_mkerr(OFPET_BAD_REQUEST, OFPBRC_BAD_LENGTH);
+    }
+
+    n_actions = actions_len / sizeof(union ofp_action);
+    error = validate_actions((const union ofp_action *) opo->actions,
+                             n_actions);
+    if (error) {
+        return error;
+    }
+
+    data->data = (void *) &opo->actions[n_actions];
+    data->size = extra - actions_len;
+    *n_actionsp = n_actions;
+    return 0;
+}
+
 const struct ofp_flow_stats *
 flow_stats_first(struct flow_stats_iterator *iter,
                  const struct ofp_stats_reply *osr)
diff --git a/lib/vconn.h b/lib/vconn.h
index 7916f86d..d521a8be 100644
--- a/lib/vconn.h
+++ b/lib/vconn.h
@@ -110,6 +110,8 @@ int check_ofp_message(const struct ofp_header *, uint8_t type, size_t size);
 int check_ofp_message_array(const struct ofp_header *, uint8_t type,
                             size_t size, size_t array_elt_size,
                             size_t *n_array_elts);
+int check_ofp_packet_out(const struct ofp_header *, struct ofpbuf *data,
+                         int *n_actions);
 
 struct flow_stats_iterator {
     const uint8_t *pos, *end;
-- 
2.30.2