tipc: add name table dump to new netlink api

Add TIPC_NL_NAME_TABLE_GET command to the new tipc netlink API.

This command supports dumping the name table of all nodes.

Netlink logical layout of name table response message:
-> name table
    -> publication
        -> type
        -> lower
        -> upper
        -> scope
        -> node
        -> ref
        -> key

Signed-off-by: Richard Alpe <richard.alpe@ericsson.com>
Reviewed-by: Erik Hugne <erik.hugne@ericsson.com>
Reviewed-by: Jon Maloy <jon.maloy@ericsson.com>
Acked-by: Ying Xue <ying.xue@windriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/uapi/linux/tipc_netlink.h b/include/uapi/linux/tipc_netlink.h
index fb980e2..8d72382 100644 (file)
--- a/include/uapi/linux/tipc_netlink.h
+++ b/include/uapi/linux/tipc_netlink.h
@@ -55,6 +55,7 @@ enum {
        TIPC_NL_NODE_GET,
        TIPC_NL_NET_GET,
        TIPC_NL_NET_SET,
+       TIPC_NL_NAME_TABLE_GET,
 
        __TIPC_NL_CMD_MAX,
        TIPC_NL_CMD_MAX = __TIPC_NL_CMD_MAX - 1
@@ -70,6 +71,7 @@ enum {
        TIPC_NLA_MEDIA,                 /* nest */
        TIPC_NLA_NODE,                  /* nest */
        TIPC_NLA_NET,                   /* nest */
+       TIPC_NLA_NAME_TABLE,            /* nest */
 
        __TIPC_NLA_MAX,
        TIPC_NLA_MAX = __TIPC_NLA_MAX - 1
@@ -146,6 +148,15 @@ enum {
        TIPC_NLA_NET_MAX = __TIPC_NLA_NET_MAX - 1
 };
 
+/* Name table info */
+enum {
+       TIPC_NLA_NAME_TABLE_UNSPEC,
+       TIPC_NLA_NAME_TABLE_PUBL,       /* nest */
+
+       __TIPC_NLA_NAME_TABLE_MAX,
+       TIPC_NLA_NAME_TABLE_MAX = __TIPC_NLA_NAME_TABLE_MAX - 1
+};
+
 /* Publication info */
 enum {
        TIPC_NLA_PUBL_UNSPEC,

diff --git a/net/tipc/name_table.c b/net/tipc/name_table.c
index 3a6a0a7..30ca8e0 100644 (file)
--- a/net/tipc/name_table.c
+++ b/net/tipc/name_table.c
@@ -1,7 +1,7 @@
 /*
  * net/tipc/name_table.c: TIPC name table code
  *
- * Copyright (c) 2000-2006, Ericsson AB
+ * Copyright (c) 2000-2006, 2014, Ericsson AB
  * Copyright (c) 2004-2008, 2010-2011, Wind River Systems
  * All rights reserved.
  *
@@ -42,6 +42,12 @@
 
 #define TIPC_NAMETBL_SIZE 1024         /* must be a power of 2 */
 
+static const struct nla_policy
+tipc_nl_name_table_policy[TIPC_NLA_NAME_TABLE_MAX + 1] = {
+       [TIPC_NLA_NAME_TABLE_UNSPEC]    = { .type = NLA_UNSPEC },
+       [TIPC_NLA_NAME_TABLE_PUBL]      = { .type = NLA_NESTED }
+};
+
 /**
  * struct name_info - name sequence publication info
  * @node_list: circular list of publications made by own node
@@ -995,3 +1001,185 @@ void tipc_nametbl_stop(void)
        table.types = NULL;
        write_unlock_bh(&tipc_nametbl_lock);
 }
+
+int __tipc_nl_add_nametable_publ(struct tipc_nl_msg *msg, struct name_seq *seq,
+                                struct sub_seq *sseq, u32 *last_publ)
+{
+       void *hdr;
+       struct nlattr *attrs;
+       struct nlattr *publ;
+       struct publication *p;
+
+       if (*last_publ) {
+               list_for_each_entry(p, &sseq->info->zone_list, zone_list)
+                       if (p->key == *last_publ)
+                               break;
+               if (p->key != *last_publ)
+                       return -EPIPE;
+       } else {
+               p = list_first_entry(&sseq->info->zone_list, struct publication,
+                                    zone_list);
+       }
+
+       list_for_each_entry_from(p, &sseq->info->zone_list, zone_list) {
+               *last_publ = p->key;
+
+               hdr = genlmsg_put(msg->skb, msg->portid, msg->seq,
+                                 &tipc_genl_v2_family, NLM_F_MULTI,
+                                 TIPC_NL_NAME_TABLE_GET);
+               if (!hdr)
+                       return -EMSGSIZE;
+
+               attrs = nla_nest_start(msg->skb, TIPC_NLA_NAME_TABLE);
+               if (!attrs)
+                       goto msg_full;
+
+               publ = nla_nest_start(msg->skb, TIPC_NLA_NAME_TABLE_PUBL);
+               if (!publ)
+                       goto attr_msg_full;
+
+               if (nla_put_u32(msg->skb, TIPC_NLA_PUBL_TYPE, seq->type))
+                       goto publ_msg_full;
+               if (nla_put_u32(msg->skb, TIPC_NLA_PUBL_LOWER, sseq->lower))
+                       goto publ_msg_full;
+               if (nla_put_u32(msg->skb, TIPC_NLA_PUBL_UPPER, sseq->upper))
+                       goto publ_msg_full;
+               if (nla_put_u32(msg->skb, TIPC_NLA_PUBL_SCOPE, p->scope))
+                       goto publ_msg_full;
+               if (nla_put_u32(msg->skb, TIPC_NLA_PUBL_NODE, p->node))
+                       goto publ_msg_full;
+               if (nla_put_u32(msg->skb, TIPC_NLA_PUBL_REF, p->ref))
+                       goto publ_msg_full;
+               if (nla_put_u32(msg->skb, TIPC_NLA_PUBL_KEY, p->key))
+                       goto publ_msg_full;
+
+               nla_nest_end(msg->skb, publ);
+               nla_nest_end(msg->skb, attrs);
+               genlmsg_end(msg->skb, hdr);
+       }
+       *last_publ = 0;
+
+       return 0;
+
+publ_msg_full:
+       nla_nest_cancel(msg->skb, publ);
+attr_msg_full:
+       nla_nest_cancel(msg->skb, attrs);
+msg_full:
+       genlmsg_cancel(msg->skb, hdr);
+
+       return -EMSGSIZE;
+}
+
+int __tipc_nl_subseq_list(struct tipc_nl_msg *msg, struct name_seq *seq,
+                         u32 *last_lower, u32 *last_publ)
+{
+       struct sub_seq *sseq;
+       struct sub_seq *sseq_start;
+       int err;
+
+       if (*last_lower) {
+               sseq_start = nameseq_find_subseq(seq, *last_lower);
+               if (!sseq_start)
+                       return -EPIPE;
+       } else {
+               sseq_start = seq->sseqs;
+       }
+
+       for (sseq = sseq_start; sseq != &seq->sseqs[seq->first_free]; sseq++) {
+               err = __tipc_nl_add_nametable_publ(msg, seq, sseq, last_publ);
+               if (err) {
+                       *last_lower = sseq->lower;
+                       return err;
+               }
+       }
+       *last_lower = 0;
+
+       return 0;
+}
+
+int __tipc_nl_seq_list(struct tipc_nl_msg *msg, u32 *last_type, u32 *last_lower,
+                      u32 *last_publ)
+{
+       struct hlist_head *seq_head;
+       struct name_seq *seq;
+       int err;
+       int i;
+
+       if (*last_type)
+               i = hash(*last_type);
+       else
+               i = 0;
+
+       for (; i < TIPC_NAMETBL_SIZE; i++) {
+               seq_head = &table.types[i];
+
+               if (*last_type) {
+                       seq = nametbl_find_seq(*last_type);
+                       if (!seq)
+                               return -EPIPE;
+               } else {
+                       seq = hlist_entry_safe((seq_head)->first,
+                                              struct name_seq, ns_list);
+                       if (!seq)
+                               continue;
+               }
+
+               hlist_for_each_entry_from(seq, ns_list) {
+                       spin_lock_bh(&seq->lock);
+
+                       err = __tipc_nl_subseq_list(msg, seq, last_lower,
+                                                   last_publ);
+
+                       if (err) {
+                               *last_type = seq->type;
+                               spin_unlock_bh(&seq->lock);
+                               return err;
+                       }
+                       spin_unlock_bh(&seq->lock);
+               }
+               *last_type = 0;
+       }
+       return 0;
+}
+
+int tipc_nl_name_table_dump(struct sk_buff *skb, struct netlink_callback *cb)
+{
+       int err;
+       int done = cb->args[3];
+       u32 last_type = cb->args[0];
+       u32 last_lower = cb->args[1];
+       u32 last_publ = cb->args[2];
+       struct tipc_nl_msg msg;
+
+       if (done)
+               return 0;
+
+       msg.skb = skb;
+       msg.portid = NETLINK_CB(cb->skb).portid;
+       msg.seq = cb->nlh->nlmsg_seq;
+
+       read_lock_bh(&tipc_nametbl_lock);
+
+       err = __tipc_nl_seq_list(&msg, &last_type, &last_lower, &last_publ);
+       if (!err) {
+               done = 1;
+       } else if (err != -EMSGSIZE) {
+               /* We never set seq or call nl_dump_check_consistent() this
+                * means that setting prev_seq here will cause the consistence
+                * check to fail in the netlink callback handler. Resulting in
+                * the NLMSG_DONE message having the NLM_F_DUMP_INTR flag set if
+                * we got an error.
+                */
+               cb->prev_seq = 1;
+       }
+
+       read_unlock_bh(&tipc_nametbl_lock);
+
+       cb->args[0] = last_type;
+       cb->args[1] = last_lower;
+       cb->args[2] = last_publ;
+       cb->args[3] = done;
+
+       return skb->len;
+}

diff --git a/net/tipc/name_table.h b/net/tipc/name_table.h
index f02f48b..b38ebec 100644 (file)
--- a/net/tipc/name_table.h
+++ b/net/tipc/name_table.h
@@ -1,7 +1,7 @@
 /*
  * net/tipc/name_table.h: Include file for TIPC name table code
  *
- * Copyright (c) 2000-2006, Ericsson AB
+ * Copyright (c) 2000-2006, 2014, Ericsson AB
  * Copyright (c) 2004-2005, 2010-2011, Wind River Systems
  * All rights reserved.
  *
@@ -84,6 +84,8 @@ struct publication {
 
 extern rwlock_t tipc_nametbl_lock;
 
+int tipc_nl_name_table_dump(struct sk_buff *skb, struct netlink_callback *cb);
+
 struct sk_buff *tipc_nametbl_get(const void *req_tlv_area, int req_tlv_space);
 u32 tipc_nametbl_translate(u32 type, u32 instance, u32 *node);
 int tipc_nametbl_mc_translate(u32 type, u32 lower, u32 upper, u32 limit,

diff --git a/net/tipc/netlink.c b/net/tipc/netlink.c
index cb37d30..b891e39 100644 (file)
--- a/net/tipc/netlink.c
+++ b/net/tipc/netlink.c
@@ -37,6 +37,7 @@
 #include "core.h"
 #include "config.h"
 #include "socket.h"
+#include "name_table.h"
 #include "bearer.h"
 #include "link.h"
 #include "node.h"
@@ -81,7 +82,8 @@ static const struct nla_policy tipc_nl_policy[TIPC_NLA_MAX + 1] = {
        [TIPC_NLA_LINK]         = { .type = NLA_NESTED, },
        [TIPC_NLA_MEDIA]        = { .type = NLA_NESTED, },
        [TIPC_NLA_NODE]         = { .type = NLA_NESTED, },
-       [TIPC_NLA_NET]          = { .type = NLA_NESTED, }
+       [TIPC_NLA_NET]          = { .type = NLA_NESTED, },
+       [TIPC_NLA_NAME_TABLE]   = { .type = NLA_NESTED, }
 };
 
 /* Legacy ASCII API */
@@ -185,6 +187,11 @@ static const struct genl_ops tipc_genl_v2_ops[] = {
                .cmd    = TIPC_NL_NET_SET,
                .doit   = tipc_nl_net_set,
                .policy = tipc_nl_policy,
+       },
+       {
+               .cmd    = TIPC_NL_NAME_TABLE_GET,
+               .dumpit = tipc_nl_name_table_dump,
+               .policy = tipc_nl_policy,
        }
 };