static int send_port_status(struct net_bridge_port *p, uint8_t status);
-/* nla_unreserve - reduce amount of space reserved by nla_reserve
+/* nla_shrink - reduce amount of space reserved by nla_reserve
* @skb: socket buffer from which to recover room
* @nla: netlink attribute to adjust
- * @len: amount by which to reduce attribute payload
+ * @len: new length of attribute payload
*
* Reduces amount of space reserved by a call to nla_reserve.
*
* No other attributes may be added between calling nla_reserve and this
* function, since it will create a hole in the message.
*/
-void nla_unreserve(struct sk_buff *skb, struct nlattr *nla, int len)
+void nla_shrink(struct sk_buff *skb, struct nlattr *nla, int len)
{
- skb->tail -= len;
- skb->len -= len;
-
- nla->nla_len -= len;
+ int delta = nla_total_size(len) - nla_total_size(nla_len(nla));
+ BUG_ON(delta > 0);
+ skb->tail += delta;
+ skb->len += delta;
+ nla->nla_len = nla_attr_size(len);
}
+/* Puts a set of openflow headers for a message of the given 'type' into 'skb'.
+ * If 'sender' is nonnull, then it is used as the message's destination. 'dp'
+ * must specify the datapath to use.
+ *
+ * '*max_openflow_len' receives the maximum number of bytes that are available
+ * for the embedded OpenFlow message. The caller must call
+ * resize_openflow_skb() to set the actual size of the message to this number
+ * of bytes or less.
+ *
+ * Returns the openflow header if successful, otherwise (if 'skb' is too small)
+ * an error code. */
static void *
-alloc_openflow_skb(struct datapath *dp, size_t openflow_len, uint8_t type,
- const struct sender *sender, struct sk_buff **pskb)
+put_openflow_headers(struct datapath *dp, struct sk_buff *skb, uint8_t type,
+ const struct sender *sender, int *max_openflow_len)
{
- size_t genl_len;
- struct sk_buff *skb;
- struct nlattr *attr;
struct ofp_header *oh;
-
- genl_len = nlmsg_total_size(GENL_HDRLEN + dp_genl_family.hdrsize);
- genl_len += nla_total_size(sizeof(uint32_t)); /* DP_GENL_A_DP_IDX */
- genl_len += nla_total_size(openflow_len); /* DP_GENL_A_OPENFLOW */
- skb = *pskb = genlmsg_new(genl_len, GFP_ATOMIC);
- if (!skb) {
- if (net_ratelimit())
- printk("alloc_openflow_skb: genlmsg_new failed\n");
- return NULL;
- }
+ struct nlattr *attr;
+ int openflow_len;
/* Assemble the Generic Netlink wrapper. */
if (!genlmsg_put(skb,
sender ? sender->pid : 0,
sender ? sender->seq : 0,
&dp_genl_family, 0, DP_GENL_C_OPENFLOW))
- BUG();
+ return ERR_PTR(-ENOBUFS);
if (nla_put_u32(skb, DP_GENL_A_DP_IDX, dp->dp_idx) < 0)
- BUG();
+ return ERR_PTR(-ENOBUFS);
+ openflow_len = (skb_tailroom(skb) - NLA_HDRLEN) & ~(NLA_ALIGNTO - 1);
+ if (openflow_len < sizeof *oh)
+ return ERR_PTR(-ENOBUFS);
+ *max_openflow_len = openflow_len;
attr = nla_reserve(skb, DP_GENL_A_OPENFLOW, openflow_len);
BUG_ON(!attr);
- nlmsg_end(skb, (struct nlmsghdr *) skb->data);
- /* Fill in the header. */
+ /* Fill in the header. The caller is responsible for the length. */
oh = nla_data(attr);
oh->version = OFP_VERSION;
oh->type = type;
- oh->length = htons(openflow_len);
oh->xid = sender ? sender->xid : 0;
return oh;
}
+/* Resizes OpenFlow header 'oh', which must be at the tail end of 'skb', to new
+ * length 'new_length' (in bytes), adjusting pointers and size values as
+ * necessary. */
static void
resize_openflow_skb(struct sk_buff *skb,
struct ofp_header *oh, size_t new_length)
{
- struct nlattr *attr;
-
- BUG_ON(new_length > ntohs(oh->length));
- attr = ((void *) oh) - NLA_HDRLEN;
- nla_unreserve(skb, attr, ntohs(oh->length) - new_length);
+ struct nlattr *attr = ((void *) oh) - NLA_HDRLEN;
+ nla_shrink(skb, attr, new_length);
oh->length = htons(new_length);
nlmsg_end(skb, (struct nlmsghdr *) skb->data);
}
+/* Allocates a new skb to contain an OpenFlow message 'openflow_len' bytes in
+ * length. Returns a null pointer if memory is unavailable, otherwise returns
+ * the OpenFlow header and stores a pointer to the skb in '*pskb'.
+ *
+ * 'type' is the OpenFlow message type. If 'sender' is nonnull, then it is
+ * used as the message's destination. 'dp' must specify the datapath to
+ * use. */
+static void *
+alloc_openflow_skb(struct datapath *dp, size_t openflow_len, uint8_t type,
+ const struct sender *sender, struct sk_buff **pskb)
+{
+ struct ofp_header *oh;
+ size_t genl_len;
+ struct sk_buff *skb;
+ int max_openflow_len;
+
+ genl_len = nlmsg_total_size(GENL_HDRLEN + dp_genl_family.hdrsize);
+ genl_len += nla_total_size(sizeof(uint32_t)); /* DP_GENL_A_DP_IDX */
+ genl_len += nla_total_size(openflow_len); /* DP_GENL_A_OPENFLOW */
+ skb = *pskb = genlmsg_new(genl_len, GFP_ATOMIC);
+ if (!skb) {
+ if (net_ratelimit())
+ printk("alloc_openflow_skb: genlmsg_new failed\n");
+ return NULL;
+ }
+
+ oh = put_openflow_headers(dp, skb, type, sender, &max_openflow_len);
+ BUG_ON(!oh || IS_ERR(oh));
+ resize_openflow_skb(skb, oh, openflow_len);
+
+ return oh;
+}
+
+/* Sends 'skb' to 'sender' if it is nonnull, otherwise multicasts 'skb' to all
+ * listeners. */
static int
send_openflow_skb(struct sk_buff *skb, const struct sender *sender)
{
ofs->byte_count = cpu_to_be64(flow->byte_count);
}
-int
-dp_send_flow_stats(struct datapath *dp, const struct sender *sender,
- const struct ofp_match *match)
-{
- struct sk_buff *skb;
- struct ofp_flow_stats_reply *fsr;
- size_t header_size, fudge, flow_size;
- struct sw_flow_key match_key;
- int table_idx, n_flows, max_flows;
-
- header_size = offsetof(struct ofp_flow_stats_reply, flows);
- fudge = 128;
- flow_size = sizeof fsr->flows[0];
- max_flows = (NLMSG_GOODSIZE - header_size - fudge) / flow_size;
- fsr = alloc_openflow_skb(dp, header_size + max_flows * flow_size,
- OFPT_FLOW_STATS_REPLY, sender, &skb);
- if (!fsr)
- return -ENOMEM;
-
- n_flows = 0;
- flow_extract_match(&match_key, match);
- for (table_idx = 0; table_idx < dp->chain->n_tables; table_idx++) {
- struct sw_table *table = dp->chain->tables[table_idx];
- struct swt_iterator iter;
-
- if (n_flows >= max_flows) {
- break;
- }
-
- if (!table->iterator(table, &iter)) {
- if (net_ratelimit())
- printk("iterator failed for table %d\n",
- table_idx);
- continue;
- }
-
- for (; iter.flow; table->iterator_next(&iter)) {
- if (flow_matches(&match_key, &iter.flow->key)) {
- fill_flow_stats(&fsr->flows[n_flows],
- iter.flow, table_idx);
- if (++n_flows >= max_flows) {
- break;
- }
- }
- }
- table->iterator_destroy(&iter);
- }
- resize_openflow_skb(skb, &fsr->header,
- header_size + flow_size * n_flows);
- return send_openflow_skb(skb, sender);
-}
-
static int
fill_port_stats_reply(struct datapath *dp, struct ofp_port_stats_reply *psr)
{
[DP_GENL_A_DP_IDX] = { .type = NLA_U32 },
};
+struct flow_stats_cb_state {
+ int dp_idx;
+ int table_idx;
+ struct sw_table_position position;
+ struct ofp_flow_stats_request *rq;
+ int sent_terminator;
+
+ struct ofp_flow_stats *flows;
+ int n_flows, max_flows;
+};
+
+static int muster_callback(struct sw_flow *flow, void *private)
+{
+ struct flow_stats_cb_state *s = private;
+
+ fill_flow_stats(&s->flows[s->n_flows], flow, s->table_idx);
+ return ++s->n_flows >= s->max_flows;
+}
+
+int
+muster_flow_stats(struct datapath *dp, struct flow_stats_cb_state *s,
+ const struct sender *sender, struct sk_buff *skb)
+{
+ struct ofp_flow_stats_reply *fsr;
+ size_t header_size, flow_size;
+ struct sw_flow_key match_key;
+ int max_openflow_len;
+ size_t size;
+
+ fsr = put_openflow_headers(dp, skb, OFPT_FLOW_STATS_REPLY, sender,
+ &max_openflow_len);
+ if (IS_ERR(fsr))
+ return PTR_ERR(fsr);
+ resize_openflow_skb(skb, &fsr->header, max_openflow_len);
+
+ header_size = offsetof(struct ofp_flow_stats_reply, flows);
+ flow_size = sizeof fsr->flows[0];
+ s->max_flows = (max_openflow_len - header_size) / flow_size;
+ if (s->max_flows <= 0)
+ return -ENOMEM;
+ s->flows = fsr->flows;
+
+ flow_extract_match(&match_key, &s->rq->match);
+ s->n_flows = 0;
+ while (s->table_idx < dp->chain->n_tables
+ && (s->rq->table_id == 0xff || s->rq->table_id == s->table_idx))
+ {
+ struct sw_table *table = dp->chain->tables[s->table_idx];
+
+ if (table->iterate(table, &match_key, &s->position,
+ muster_callback, s))
+ break;
+
+ s->table_idx++;
+ memset(&s->position, 0, sizeof s->position);
+ }
+ if (!s->n_flows) {
+ /* Signal dump completion. */
+ if (s->sent_terminator) {
+ return 0;
+ }
+ s->sent_terminator = 1;
+ }
+ size = header_size + flow_size * s->n_flows;
+ resize_openflow_skb(skb, &fsr->header, size);
+ return skb->len;
+}
+
+static int
+dp_genl_openflow_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
+{
+ struct datapath *dp;
+ struct sender sender;
+ struct flow_stats_cb_state *state;
+ int err;
+
+ if (!cb->args[0]) {
+ struct nlattr *attrs[DP_GENL_A_MAX + 1];
+ struct ofp_flow_stats_request *rq;
+ struct nlattr *va;
+
+ err = nlmsg_parse(cb->nlh, GENL_HDRLEN, attrs, DP_GENL_A_MAX,
+ dp_genl_openflow_policy);
+ if (err < 0)
+ return err;
+
+ if (!attrs[DP_GENL_A_DP_IDX])
+ return -EINVAL;
+
+ va = attrs[DP_GENL_A_OPENFLOW];
+ if (!va || nla_len(va) != sizeof *state->rq)
+ return -EINVAL;
+
+ rq = nla_data(va);
+ if (rq->header.version != OFP_VERSION
+ || rq->header.type != OFPT_FLOW_STATS_REQUEST
+ || ntohs(rq->header.length) != sizeof *rq)
+ return -EINVAL;
+
+ state = kmalloc(sizeof *state, GFP_KERNEL);
+ if (!state)
+ return -ENOMEM;
+ state->dp_idx = nla_get_u32(attrs[DP_GENL_A_DP_IDX]);
+ state->table_idx = rq->table_id == 0xff ? 0 : rq->table_id;
+ memset(&state->position, 0, sizeof state->position);
+ state->rq = rq;
+ state->sent_terminator = 0;
+
+ cb->args[0] = (long) state;
+ } else {
+ state = (struct flow_stats_cb_state *) cb->args[0];
+ }
+
+ if (state->rq->type != OFPFS_INDIV) {
+ return -ENOTSUPP;
+ }
+
+ rcu_read_lock();
+ dp = dp_get(state->dp_idx);
+ if (!dp) {
+ err = -ENOENT;
+ goto out;
+ }
+
+ sender.xid = state->rq->header.xid;
+ sender.pid = NETLINK_CB(cb->skb).pid;
+ sender.seq = cb->nlh->nlmsg_seq;
+ err = muster_flow_stats(dp, state, &sender, skb);
+
+out:
+ rcu_read_unlock();
+ return err;
+}
+
+static int
+dp_genl_openflow_done(struct netlink_callback *cb)
+{
+ struct flow_stats_cb_state *state;
+ state = (struct flow_stats_cb_state *) cb->args[0];
+ kfree(state);
+ return 0;
+}
+
static struct genl_ops dp_genl_ops_openflow = {
.cmd = DP_GENL_C_OPENFLOW,
.flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
.policy = dp_genl_openflow_policy,
.doit = dp_genl_openflow,
- .dumpit = NULL,
+ .dumpit = dp_genl_openflow_dumpit,
+ .done = dp_genl_openflow_done,
};
static struct nla_policy dp_genl_benchmark_policy[DP_GENL_A_MAX + 1] = {
git://git.onelab.eu / sliver-openvswitch.git / blobdiff