#define BRIDGE_PORT_NO_FLOOD 0x00000001
#define UINT32_MAX 4294967295U
+#define UINT16_MAX 65535
#define MAX(X, Y) ((X) > (Y) ? (X) : (Y))
struct net_bridge_port {
static int dp_maint_func(void *data);
static int send_port_status(struct net_bridge_port *p, uint8_t status);
+static int dp_genl_openflow_done(struct netlink_callback *);
-
-/* 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 = 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;
+
+ if ((openflow_len + sizeof(struct ofp_header)) > UINT16_MAX) {
+ if (net_ratelimit())
+ printk("alloc_openflow_skb: openflow message too large: %zu\n",
+ openflow_len);
+ return NULL;
+ }
+
+ 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)
{
printk("datapath: problem setting up 'of' device\n");
#endif
- dp->config.flags = 0;
- dp->config.miss_send_len = htons(OFP_DEFAULT_MISS_SEND_LEN);
+ dp->flags = 0;
+ dp->miss_send_len = OFP_DEFAULT_MISS_SEND_LEN;
dp->dp_task = kthread_run(dp_maint_func, dp, "dp%d", dp_idx);
if (IS_ERR(dp->dp_task))
/* Forwarding output path.
* Based on net/bridge/br_forward.c. */
-/* Don't forward packets to originating port or with flooding disabled */
+/* Don't forward packets to originating port. If we're flooding,
+ * then don't send out ports with flooding disabled.
+ */
static inline int should_deliver(const struct net_bridge_port *p,
- const struct sk_buff *skb)
+ const struct sk_buff *skb, int flood)
{
- if ((skb->dev == p->dev) || (p->flags & BRIDGE_PORT_NO_FLOOD)) {
+ if (skb->dev == p->dev)
+ return 0;
+
+ if (flood && (p->flags & BRIDGE_PORT_NO_FLOOD))
return 0;
- }
return 1;
}
return length;
}
+/* Send packets out all the ports except the originating one. If the
+ * "flood" argument is set, only send along the minimum spanning tree.
+ */
static int
-flood(struct datapath *dp, struct sk_buff *skb)
+output_all(struct datapath *dp, struct sk_buff *skb, int flood)
{
struct net_bridge_port *p;
int prev_port;
prev_port = -1;
list_for_each_entry_rcu (p, &dp->port_list, node) {
- if (!should_deliver(p, skb))
+ if (!should_deliver(p, skb, flood))
continue;
if (prev_port != -1) {
struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC);
BUG_ON(!skb);
if (out_port == OFPP_FLOOD)
- return flood(dp, skb);
+ return output_all(dp, skb, 1);
+ else if (out_port == OFPP_ALL)
+ return output_all(dp, skb, 0);
else if (out_port == OFPP_CONTROLLER)
return dp_output_control(dp, skb, fwd_save_skb(skb), 0,
OFPR_ACTION);
opi_len = offsetof(struct ofp_packet_in, data) + fwd_len;
opi = alloc_openflow_skb(dp, opi_len, OFPT_PACKET_IN, NULL, &f_skb);
+ if (!opi) {
+ err = -ENOMEM;
+ goto out;
+ }
opi->buffer_id = htonl(buffer_id);
opi->total_len = htons(skb->len);
opi->in_port = htons(skb->dev->br_port->port_no);
memcpy(opi->data, skb_mac_header(skb), fwd_len);
err = send_openflow_skb(f_skb, NULL);
+out:
kfree_skb(skb);
-
return err;
}
ofr->datapath_id = cpu_to_be64(dp->id);
ofr->n_exact = htonl(2 * TABLE_HASH_MAX_FLOWS);
- ofr->n_mac_only = htonl(TABLE_MAC_MAX_FLOWS);
ofr->n_compression = 0; /* Not supported */
ofr->n_general = htonl(TABLE_LINEAR_MAX_FLOWS);
ofr->buffer_mb = htonl(UINT32_MAX);
struct sk_buff *skb;
struct ofp_switch_config *osc;
- osc = alloc_openflow_skb(dp, sizeof *osc, OFPT_PORT_STATUS, sender,
+ osc = alloc_openflow_skb(dp, sizeof *osc, OFPT_GET_CONFIG_REPLY, sender,
&skb);
if (!osc)
return -ENOMEM;
- memcpy(((char *)osc) + sizeof osc->header,
- ((char *)&dp->config) + sizeof dp->config.header,
- sizeof dp->config - sizeof dp->config.header);
+
+ osc->flags = htons(dp->flags);
+ osc->miss_send_len = htons(dp->miss_send_len);
+
return send_openflow_skb(skb, sender);
}
if (!ops)
return -ENOMEM;
ops->reason = status;
+ memset(ops->pad, 0, sizeof ops->pad);
fill_port_desc(p, &ops->desc);
return send_openflow_skb(skb, NULL);
return -ENOMEM;
flow_fill_match(&ofe->match, &flow->key);
- duration_j = (flow->timeout - HZ * flow->max_idle) - flow->init_time;
- ofe->duration = htonl(duration_j / HZ);
- ofe->packet_count = cpu_to_be64(flow->packet_count);
- ofe->byte_count = cpu_to_be64(flow->byte_count);
- return send_openflow_skb(skb, NULL);
-}
-
-static void
-fill_flow_stats(struct ofp_flow_stats *ofs, struct sw_flow *flow,
- int table_idx)
-{
- ofs->match.wildcards = htons(flow->key.wildcards);
- ofs->match.in_port = flow->key.in_port;
- memcpy(ofs->match.dl_src, flow->key.dl_src, ETH_ALEN);
- memcpy(ofs->match.dl_dst, flow->key.dl_dst, ETH_ALEN);
- ofs->match.dl_vlan = flow->key.dl_vlan;
- ofs->match.dl_type = flow->key.dl_type;
- ofs->match.nw_src = flow->key.nw_src;
- ofs->match.nw_dst = flow->key.nw_dst;
- ofs->match.nw_proto = flow->key.nw_proto;
- memset(ofs->match.pad, 0, sizeof ofs->match.pad);
- ofs->match.tp_src = flow->key.tp_src;
- ofs->match.tp_dst = flow->key.tp_dst;
- ofs->duration = htonl((jiffies - flow->init_time) / HZ);
- ofs->table_id = table_idx;
- ofs->packet_count = cpu_to_be64(flow->packet_count);
- 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_stat_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_stat_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_STAT_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;
+ memset(ofe->pad, 0, sizeof ofe->pad);
+ ofe->priority = htons(flow->priority);
- 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_stat_reply(struct datapath *dp, struct ofp_port_stat_reply *psr)
-{
- struct net_bridge_port *p;
- int port_count = 0;
-
- list_for_each_entry_rcu (p, &dp->port_list, node) {
- struct ofp_port_stats *ps = &psr->ports[port_count++];
- struct net_device_stats *stats = p->dev->get_stats(p->dev);
- ps->port_no = htons(p->port_no);
- memset(ps->pad, 0, sizeof ps->pad);
- ps->rx_count = cpu_to_be64(stats->rx_packets);
- ps->tx_count = cpu_to_be64(stats->tx_packets);
- ps->drop_count = cpu_to_be64(stats->rx_dropped
- + stats->tx_dropped);
- }
+ duration_j = (flow->timeout - HZ * flow->max_idle) - flow->init_time;
+ ofe->duration = htonl(duration_j / HZ);
+ ofe->packet_count = cpu_to_be64(flow->packet_count);
+ ofe->byte_count = cpu_to_be64(flow->byte_count);
- return port_count;
+ return send_openflow_skb(skb, NULL);
}
int
-dp_send_port_stats(struct datapath *dp, const struct sender *sender)
+dp_send_error_msg(struct datapath *dp, const struct sender *sender,
+ uint16_t type, uint16_t code, const uint8_t *data, size_t len)
{
struct sk_buff *skb;
- struct ofp_port_stat_reply *psr;
- size_t psr_len, port_max_len;
- int port_count;
+ struct ofp_error_msg *oem;
- /* Overallocate. */
- port_max_len = sizeof(struct ofp_port_stats) * OFPP_MAX;
- psr = alloc_openflow_skb(dp, sizeof *psr + port_max_len,
- OFPT_PORT_STAT_REPLY, sender, &skb);
- if (!psr)
+
+ oem = alloc_openflow_skb(dp, sizeof(*oem)+len, OFPT_ERROR_MSG,
+ sender, &skb);
+ if (!oem)
return -ENOMEM;
- /* Fill. */
- port_count = fill_port_stat_reply(dp, psr);
+ oem->type = htons(type);
+ oem->code = htons(code);
+ memcpy(oem->data, data, len);
- /* Shrink to fit. */
- psr_len = sizeof *psr + sizeof(struct ofp_port_stats) * port_count;
- resize_openflow_skb(skb, &psr->header, psr_len);
- return send_openflow_skb(skb, sender);
-}
-
-int
-dp_send_table_stats(struct datapath *dp, const struct sender *sender)
-{
- struct sk_buff *skb;
- struct ofp_table_stat_reply *tsr;
- int i, n_tables;
-
- n_tables = dp->chain->n_tables;
- tsr = alloc_openflow_skb(dp, (offsetof(struct ofp_table_stat_reply,
- tables)
- + sizeof tsr->tables[0] * n_tables),
- OFPT_TABLE_STAT_REPLY, sender, &skb);
- if (!tsr)
- return -ENOMEM;
- for (i = 0; i < n_tables; i++) {
- struct ofp_table_stats *ots = &tsr->tables[i];
- struct sw_table_stats stats;
- dp->chain->tables[i]->stats(dp->chain->tables[i], &stats);
- strncpy(ots->name, stats.name, sizeof ots->name);
- ots->table_id = i;
- ots->pad[0] = ots->pad[1] = 0;
- ots->max_entries = htonl(stats.max_flows);
- ots->active_count = htonl(stats.n_flows);
- ots->matched_count = cpu_to_be64(0); /* FIXME */
- }
return send_openflow_skb(skb, sender);
}
err = -ENOENT;
else {
void *data;
- ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
+ ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
if (!ans_skb) {
err = -ENOMEM;
goto err;
[DP_GENL_A_DP_IDX] = { .type = NLA_U32 },
};
+struct flow_stats_state {
+ int table_idx;
+ struct sw_table_position position;
+ const struct ofp_flow_stats_request *rq;
+
+ void *body;
+ int bytes_used, bytes_allocated;
+};
+
+static int flow_stats_init(struct datapath *dp, const void *body, int body_len,
+ void **state)
+{
+ const struct ofp_flow_stats_request *fsr = body;
+ struct flow_stats_state *s = kmalloc(sizeof *s, GFP_ATOMIC);
+ if (!s)
+ return -ENOMEM;
+ s->table_idx = fsr->table_id == 0xff ? 0 : fsr->table_id;
+ memset(&s->position, 0, sizeof s->position);
+ s->rq = fsr;
+ *state = s;
+ return 0;
+}
+
+static int flow_stats_dump_callback(struct sw_flow *flow, void *private)
+{
+ struct flow_stats_state *s = private;
+ struct ofp_flow_stats *ofs;
+ int actions_length;
+ int length;
+
+ actions_length = sizeof *ofs->actions * flow->n_actions;
+ length = sizeof *ofs + sizeof *ofs->actions * flow->n_actions;
+ if (length + s->bytes_used > s->bytes_allocated)
+ return 1;
+
+ ofs = s->body + s->bytes_used;
+ ofs->length = htons(length);
+ ofs->table_id = s->table_idx;
+ ofs->pad = 0;
+ ofs->match.wildcards = htons(flow->key.wildcards);
+ ofs->match.in_port = flow->key.in_port;
+ memcpy(ofs->match.dl_src, flow->key.dl_src, ETH_ALEN);
+ memcpy(ofs->match.dl_dst, flow->key.dl_dst, ETH_ALEN);
+ ofs->match.dl_vlan = flow->key.dl_vlan;
+ ofs->match.dl_type = flow->key.dl_type;
+ ofs->match.nw_src = flow->key.nw_src;
+ ofs->match.nw_dst = flow->key.nw_dst;
+ ofs->match.nw_proto = flow->key.nw_proto;
+ memset(ofs->match.pad, 0, sizeof ofs->match.pad);
+ ofs->match.tp_src = flow->key.tp_src;
+ ofs->match.tp_dst = flow->key.tp_dst;
+ ofs->duration = htonl((jiffies - flow->init_time) / HZ);
+ ofs->packet_count = cpu_to_be64(flow->packet_count);
+ ofs->byte_count = cpu_to_be64(flow->byte_count);
+ ofs->priority = htons(flow->priority);
+ ofs->max_idle = htons(flow->max_idle);
+ memcpy(ofs->actions, flow->actions, actions_length);
+
+ s->bytes_used += length;
+ return 0;
+}
+
+static int flow_stats_dump(struct datapath *dp, void *state,
+ void *body, int *body_len)
+{
+ struct flow_stats_state *s = state;
+ struct sw_flow_key match_key;
+ int error = 0;
+
+ s->bytes_used = 0;
+ s->bytes_allocated = *body_len;
+ s->body = body;
+
+ flow_extract_match(&match_key, &s->rq->match);
+ 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];
+
+ error = table->iterate(table, &match_key, &s->position,
+ flow_stats_dump_callback, s);
+ if (error)
+ break;
+
+ s->table_idx++;
+ memset(&s->position, 0, sizeof s->position);
+ }
+ *body_len = s->bytes_used;
+
+ /* If error is 0, we're done.
+ * Otherwise, if some bytes were used, there are more flows to come.
+ * Otherwise, we were not able to fit even a single flow in the body,
+ * which indicates that we have a single flow with too many actions to
+ * fit. We won't ever make any progress at that rate, so give up. */
+ return !error ? 0 : s->bytes_used ? 1 : -ENOMEM;
+}
+
+static void flow_stats_done(void *state)
+{
+ kfree(state);
+}
+
+static int aggregate_stats_init(struct datapath *dp,
+ const void *body, int body_len,
+ void **state)
+{
+ *state = (void *)body;
+ return 0;
+}
+
+static int aggregate_stats_dump_callback(struct sw_flow *flow, void *private)
+{
+ struct ofp_aggregate_stats_reply *rpy = private;
+ rpy->packet_count += flow->packet_count;
+ rpy->byte_count += flow->byte_count;
+ rpy->flow_count++;
+ return 0;
+}
+
+static int aggregate_stats_dump(struct datapath *dp, void *state,
+ void *body, int *body_len)
+{
+ struct ofp_aggregate_stats_request *rq = state;
+ struct ofp_aggregate_stats_reply *rpy;
+ struct sw_table_position position;
+ struct sw_flow_key match_key;
+ int table_idx;
+
+ if (*body_len < sizeof *rpy)
+ return -ENOBUFS;
+ rpy = body;
+ *body_len = sizeof *rpy;
+
+ memset(rpy, 0, sizeof *rpy);
+
+ flow_extract_match(&match_key, &rq->match);
+ table_idx = rq->table_id == 0xff ? 0 : rq->table_id;
+ memset(&position, 0, sizeof position);
+ while (table_idx < dp->chain->n_tables
+ && (rq->table_id == 0xff || rq->table_id == table_idx))
+ {
+ struct sw_table *table = dp->chain->tables[table_idx];
+ int error;
+
+ error = table->iterate(table, &match_key, &position,
+ aggregate_stats_dump_callback, rpy);
+ if (error)
+ return error;
+
+ table_idx++;
+ memset(&position, 0, sizeof position);
+ }
+
+ rpy->packet_count = cpu_to_be64(rpy->packet_count);
+ rpy->byte_count = cpu_to_be64(rpy->byte_count);
+ rpy->flow_count = htonl(rpy->flow_count);
+ return 0;
+}
+
+static int table_stats_dump(struct datapath *dp, void *state,
+ void *body, int *body_len)
+{
+ struct ofp_table_stats *ots;
+ int nbytes = dp->chain->n_tables * sizeof *ots;
+ int i;
+ if (nbytes > *body_len)
+ return -ENOBUFS;
+ *body_len = nbytes;
+ for (i = 0, ots = body; i < dp->chain->n_tables; i++, ots++) {
+ struct sw_table_stats stats;
+ dp->chain->tables[i]->stats(dp->chain->tables[i], &stats);
+ strncpy(ots->name, stats.name, sizeof ots->name);
+ ots->table_id = i;
+ memset(ots->pad, 0, sizeof ots->pad);
+ ots->max_entries = htonl(stats.max_flows);
+ ots->active_count = htonl(stats.n_flows);
+ ots->matched_count = cpu_to_be64(0); /* FIXME */
+ }
+ return 0;
+}
+
+struct port_stats_state {
+ int port;
+};
+
+static int port_stats_init(struct datapath *dp, const void *body, int body_len,
+ void **state)
+{
+ struct port_stats_state *s = kmalloc(sizeof *s, GFP_ATOMIC);
+ if (!s)
+ return -ENOMEM;
+ s->port = 0;
+ *state = s;
+ return 0;
+}
+
+static int port_stats_dump(struct datapath *dp, void *state,
+ void *body, int *body_len)
+{
+ struct port_stats_state *s = state;
+ struct ofp_port_stats *ops;
+ int n_ports, max_ports;
+ int i;
+
+ max_ports = *body_len / sizeof *ops;
+ if (!max_ports)
+ return -ENOMEM;
+ ops = body;
+
+ n_ports = 0;
+ for (i = s->port; i < OFPP_MAX && n_ports < max_ports; i++) {
+ struct net_bridge_port *p = dp->ports[i];
+ struct net_device_stats *stats;
+ if (!p)
+ continue;
+ stats = p->dev->get_stats(p->dev);
+ ops->port_no = htons(p->port_no);
+ memset(ops->pad, 0, sizeof ops->pad);
+ ops->rx_count = cpu_to_be64(stats->rx_packets);
+ ops->tx_count = cpu_to_be64(stats->tx_packets);
+ ops->drop_count = cpu_to_be64(stats->rx_dropped
+ + stats->tx_dropped);
+ n_ports++;
+ ops++;
+ }
+ s->port = i;
+ *body_len = n_ports * sizeof *ops;
+ return n_ports >= max_ports;
+}
+
+static void port_stats_done(void *state)
+{
+ kfree(state);
+}
+
+struct stats_type {
+ /* Minimum and maximum acceptable number of bytes in body member of
+ * struct ofp_stats_request. */
+ size_t min_body, max_body;
+
+ /* Prepares to dump some kind of statistics on 'dp'. 'body' and
+ * 'body_len' are the 'body' member of the struct ofp_stats_request.
+ * Returns zero if successful, otherwise a negative error code.
+ * May initialize '*state' to state information. May be null if no
+ * initialization is required.*/
+ int (*init)(struct datapath *dp, const void *body, int body_len,
+ void **state);
+
+ /* Dumps statistics for 'dp' into the '*body_len' bytes at 'body', and
+ * modifies '*body_len' to reflect the number of bytes actually used.
+ * ('body' will be transmitted as the 'body' member of struct
+ * ofp_stats_reply.) */
+ int (*dump)(struct datapath *dp, void *state,
+ void *body, int *body_len);
+
+ /* Cleans any state created by the init or dump functions. May be null
+ * if no cleanup is required. */
+ void (*done)(void *state);
+};
+
+static const struct stats_type stats[] = {
+ [OFPST_FLOW] = {
+ sizeof(struct ofp_flow_stats_request),
+ sizeof(struct ofp_flow_stats_request),
+ flow_stats_init,
+ flow_stats_dump,
+ flow_stats_done
+ },
+ [OFPST_AGGREGATE] = {
+ sizeof(struct ofp_aggregate_stats_request),
+ sizeof(struct ofp_aggregate_stats_request),
+ aggregate_stats_init,
+ aggregate_stats_dump,
+ NULL
+ },
+ [OFPST_TABLE] = {
+ 0,
+ 0,
+ NULL,
+ table_stats_dump,
+ NULL
+ },
+ [OFPST_PORT] = {
+ 0,
+ 0,
+ port_stats_init,
+ port_stats_dump,
+ port_stats_done
+ },
+};
+
+static int
+dp_genl_openflow_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
+{
+ struct datapath *dp;
+ struct sender sender;
+ const struct stats_type *s;
+ struct ofp_stats_reply *osr;
+ int dp_idx;
+ int max_openflow_len, body_len;
+ void *body;
+ int err;
+
+ /* Set up the cleanup function for this dump. Linux 2.6.20 and later
+ * support setting up cleanup functions via the .doneit member of
+ * struct genl_ops. This kluge supports earlier versions also. */
+ cb->done = dp_genl_openflow_done;
+
+ rcu_read_lock();
+ if (!cb->args[0]) {
+ struct nlattr *attrs[DP_GENL_A_MAX + 1];
+ struct ofp_stats_request *rq;
+ struct nlattr *va;
+ size_t len, body_len;
+ int type;
+
+ err = nlmsg_parse(cb->nlh, GENL_HDRLEN, attrs, DP_GENL_A_MAX,
+ dp_genl_openflow_policy);
+ if (err < 0)
+ return err;
+
+ err = -EINVAL;
+
+ if (!attrs[DP_GENL_A_DP_IDX])
+ goto out;
+ dp_idx = nla_get_u16(attrs[DP_GENL_A_DP_IDX]);
+ dp = dp_get(dp_idx);
+ if (!dp) {
+ err = -ENOENT;
+ goto out;
+ }
+
+ va = attrs[DP_GENL_A_OPENFLOW];
+ len = nla_len(va);
+ if (!va || len < sizeof *rq)
+ goto out;
+
+ rq = nla_data(va);
+ type = ntohs(rq->type);
+ if (rq->header.version != OFP_VERSION
+ || rq->header.type != OFPT_STATS_REQUEST
+ || ntohs(rq->header.length) != len
+ || type >= ARRAY_SIZE(stats)
+ || !stats[type].dump)
+ goto out;
+
+ s = &stats[type];
+ body_len = len - offsetof(struct ofp_stats_request, body);
+ if (body_len < s->min_body || body_len > s->max_body)
+ goto out;
+
+ cb->args[0] = 1;
+ cb->args[1] = dp_idx;
+ cb->args[2] = type;
+ cb->args[3] = rq->header.xid;
+ if (s->init) {
+ void *state;
+ err = s->init(dp, rq->body, body_len, &state);
+ if (err)
+ goto out;
+ cb->args[4] = (long) state;
+ }
+ } else if (cb->args[0] == 1) {
+ dp_idx = cb->args[1];
+ s = &stats[cb->args[2]];
+
+ dp = dp_get(dp_idx);
+ if (!dp) {
+ err = -ENOENT;
+ goto out;
+ }
+ } else {
+ err = 0;
+ goto out;
+ }
+
+ sender.xid = cb->args[3];
+ sender.pid = NETLINK_CB(cb->skb).pid;
+ sender.seq = cb->nlh->nlmsg_seq;
+
+ osr = put_openflow_headers(dp, skb, OFPT_STATS_REPLY, &sender,
+ &max_openflow_len);
+ if (IS_ERR(osr)) {
+ err = PTR_ERR(osr);
+ goto out;
+ }
+ osr->type = htons(s - stats);
+ osr->flags = 0;
+ resize_openflow_skb(skb, &osr->header, max_openflow_len);
+ body = osr->body;
+ body_len = max_openflow_len - offsetof(struct ofp_stats_reply, body);
+
+ err = s->dump(dp, (void *) cb->args[4], body, &body_len);
+ if (err >= 0) {
+ if (!err)
+ cb->args[0] = 2;
+ else
+ osr->flags = ntohs(OFPSF_REPLY_MORE);
+ resize_openflow_skb(skb, &osr->header,
+ (offsetof(struct ofp_stats_reply, body)
+ + body_len));
+ err = skb->len;
+ }
+
+out:
+ rcu_read_unlock();
+ return err;
+}
+
+static int
+dp_genl_openflow_done(struct netlink_callback *cb)
+{
+ if (cb->args[0]) {
+ const struct stats_type *s = &stats[cb->args[2]];
+ if (s->done)
+ s->done((void *) cb->args[4]);
+ }
+ 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,
};
static struct nla_policy dp_genl_benchmark_policy[DP_GENL_A_MAX + 1] = {
git://git.onelab.eu / sliver-openvswitch.git / blobdiff