By more liberal (egads!) about allocating space for netlink messages.

diff --git a/datapath/datapath.c b/datapath/datapath.c
index 32e519105dd741895017131fa99997271ba02c5f..b80c7b20da48b370f02bd78341d7945a9328bc46 100644 (file)
--- a/datapath/datapath.c
+++ b/datapath/datapath.c
@@ -45,6 +45,7 @@
 #define BRIDGE_PORT_NO_FLOOD   0x00000001 
 
 #define UINT32_MAX                       4294967295U
+#define MAX(X, Y) ((X) > (Y) ? (X) : (Y))
 
 struct net_bridge_port {
        u16     port_no;
@@ -519,7 +520,7 @@ dp_output_control(struct datapath *dp, struct sk_buff *skb,
        len = nla_total_size(offsetof(struct ofp_packet_in, data) + fwd_len) 
                                + nla_total_size(sizeof(uint32_t));
 
-       f_skb = genlmsg_new(len, GFP_ATOMIC); 
+       f_skb = genlmsg_new(MAX(len, NLMSG_GOODSIZE), GFP_ATOMIC); 
        if (!f_skb)
                goto error_free_skb;
 
@@ -656,7 +657,7 @@ dp_send_hello(struct datapath *dp)
        len = nla_total_size(sizeof(*odh) + port_max_len) 
                                + nla_total_size(sizeof(uint32_t));
 
-       skb = genlmsg_new(len, GFP_ATOMIC);
+       skb = genlmsg_new(MAX(len, NLMSG_GOODSIZE), GFP_ATOMIC);
        if (!skb) {
                if (net_ratelimit())
                        printk("dp_send_hello: genlmsg_new failed\n");
@@ -1047,7 +1048,7 @@ static int dp_genl_show(struct sk_buff *skb, struct genl_info *info)
        len = nla_total_size(sizeof(*odh) + port_max_len)
                        + nla_total_size(sizeof(uint32_t));
 
-       ans_skb = nlmsg_new(len, GFP_KERNEL);
+       ans_skb = nlmsg_new(MAX(len, NLMSG_GOODSIZE), GFP_KERNEL);
        if (!ans_skb)
                goto error;
 
@@ -1163,7 +1164,7 @@ dp_dump_table(struct datapath *dp, uint16_t table_idx, struct genl_info *info, s
                        return -ENOMEM;
                }
 
-               skb = nlmsg_new(8192 - 64, GFP_ATOMIC);
+               skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
                if (skb == NULL) {
                        return -ENOMEM;
                }
@@ -1259,13 +1260,16 @@ dp_dump_table_stats(struct datapath *dp, int dp_idx, struct genl_info *info)
        struct ofp_table *ot = 0;
        struct nlattr   *attr;
        struct sw_table_stats stats; 
+       size_t len;
        void *data; 
        int err = -ENOMEM;
        int i = 0;
        int nt = dp->chain->n_tables;
 
+       len = 4 + 4 + (sizeof(struct ofp_table) * nt);
+
        /* u32 IDX, u32 NUMTABLES, list-of-tables */
-       skb = nlmsg_new(4 + 4 + (sizeof(struct ofp_table) * nt), GFP_ATOMIC);
+       skb = nlmsg_new(MAX(len, NLMSG_GOODSIZE), GFP_ATOMIC);
        if (skb == NULL) {
                return -ENOMEM;
        }
@@ -1304,7 +1308,6 @@ dp_dump_table_stats(struct datapath *dp, int dp_idx, struct genl_info *info)
                ot++;
        }
 
-
        genlmsg_end(skb, data); 
        err = genlmsg_reply(skb, info); skb = 0;