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authorRichard Alpe <richard.alpe@ericsson.com>2016-08-26 10:52:56 +0200
committerDavid S. Miller <davem@davemloft.net>2016-08-26 21:38:41 -0700
commit832629ca5c313e122b22b8e73a6d80f111b1a1ae (patch)
treed493c51cbc2bdf880e452f4a21430fbc47ee128e /net/tipc
parentfdb3accc2c15fabc2b687b2819da9167027c61b6 (diff)
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tipc: add UDP remoteip dump to netlink API
When using replicast a UDP bearer can have an arbitrary amount of remote ip addresses associated with it. This means we cannot simply add all remote ip addresses to an existing bearer data message as it might fill the message, leaving us with a truncated message that we can't safely resume. To handle this we introduce the new netlink command TIPC_NL_UDP_GET_REMOTEIP. This command is intended to be called when the bearer data message has the TIPC_NLA_UDP_MULTI_REMOTEIP flag set, indicating there are more than one remote ip (replicast). Signed-off-by: Richard Alpe <richard.alpe@ericsson.com> Reviewed-by: Jon Maloy <jon.maloy@ericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/tipc')
-rw-r--r--net/tipc/netlink.c10
-rw-r--r--net/tipc/udp_media.c90
-rw-r--r--net/tipc/udp_media.h1
3 files changed, 100 insertions, 1 deletions
diff --git a/net/tipc/netlink.c b/net/tipc/netlink.c
index 3122f21ca979..3200059d14b2 100644
--- a/net/tipc/netlink.c
+++ b/net/tipc/netlink.c
@@ -41,6 +41,7 @@
#include "link.h"
#include "node.h"
#include "net.h"
+#include "udp_media.h"
#include <net/genetlink.h>
static const struct nla_policy tipc_nl_policy[TIPC_NLA_MAX + 1] = {
@@ -247,7 +248,14 @@ static const struct genl_ops tipc_genl_v2_ops[] = {
.cmd = TIPC_NL_PEER_REMOVE,
.doit = tipc_nl_peer_rm,
.policy = tipc_nl_policy,
- }
+ },
+#ifdef CONFIG_TIPC_MEDIA_UDP
+ {
+ .cmd = TIPC_NL_UDP_GET_REMOTEIP,
+ .dumpit = tipc_udp_nl_dump_remoteip,
+ .policy = tipc_nl_policy,
+ },
+#endif
};
int tipc_nlmsg_parse(const struct nlmsghdr *nlh, struct nlattr ***attr)
diff --git a/net/tipc/udp_media.c b/net/tipc/udp_media.c
index a6cdd9895653..245e9a2eac41 100644
--- a/net/tipc/udp_media.c
+++ b/net/tipc/udp_media.c
@@ -428,6 +428,96 @@ static int __tipc_nl_add_udp_addr(struct sk_buff *skb,
return 0;
}
+int tipc_udp_nl_dump_remoteip(struct sk_buff *skb, struct netlink_callback *cb)
+{
+ u32 bid = cb->args[0];
+ u32 skip_cnt = cb->args[1];
+ u32 portid = NETLINK_CB(cb->skb).portid;
+ struct udp_replicast *rcast, *tmp;
+ struct tipc_bearer *b;
+ struct udp_bearer *ub;
+ void *hdr;
+ int err;
+ int i;
+
+ if (!bid && !skip_cnt) {
+ struct net *net = sock_net(skb->sk);
+ struct nlattr *battrs[TIPC_NLA_BEARER_MAX + 1];
+ struct nlattr **attrs;
+ char *bname;
+
+ err = tipc_nlmsg_parse(cb->nlh, &attrs);
+ if (err)
+ return err;
+
+ if (!attrs[TIPC_NLA_BEARER])
+ return -EINVAL;
+
+ err = nla_parse_nested(battrs, TIPC_NLA_BEARER_MAX,
+ attrs[TIPC_NLA_BEARER],
+ tipc_nl_bearer_policy);
+ if (err)
+ return err;
+
+ if (!battrs[TIPC_NLA_BEARER_NAME])
+ return -EINVAL;
+
+ bname = nla_data(battrs[TIPC_NLA_BEARER_NAME]);
+
+ rtnl_lock();
+ b = tipc_bearer_find(net, bname);
+ if (!b) {
+ rtnl_unlock();
+ return -EINVAL;
+ }
+ bid = b->identity;
+ } else {
+ struct net *net = sock_net(skb->sk);
+ struct tipc_net *tn = net_generic(net, tipc_net_id);
+
+ rtnl_lock();
+ b = rtnl_dereference(tn->bearer_list[bid]);
+ if (!b) {
+ rtnl_unlock();
+ return -EINVAL;
+ }
+ }
+
+ ub = rcu_dereference_rtnl(b->media_ptr);
+ if (!ub) {
+ rtnl_unlock();
+ return -EINVAL;
+ }
+
+ i = 0;
+ list_for_each_entry_safe(rcast, tmp, &ub->rcast.list, list) {
+ if (i < skip_cnt)
+ goto count;
+
+ hdr = genlmsg_put(skb, portid, cb->nlh->nlmsg_seq,
+ &tipc_genl_family, NLM_F_MULTI,
+ TIPC_NL_BEARER_GET);
+ if (!hdr)
+ goto done;
+
+ err = __tipc_nl_add_udp_addr(skb, &rcast->addr,
+ TIPC_NLA_UDP_REMOTE);
+ if (err) {
+ genlmsg_cancel(skb, hdr);
+ goto done;
+ }
+ genlmsg_end(skb, hdr);
+count:
+ i++;
+ }
+done:
+ rtnl_unlock();
+ cb->args[0] = bid;
+ cb->args[1] = i;
+
+ return skb->len;
+}
+
int tipc_udp_nl_add_bearer_data(struct tipc_nl_msg *msg, struct tipc_bearer *b)
{
struct udp_media_addr *src = (struct udp_media_addr *)&b->addr.value;
diff --git a/net/tipc/udp_media.h b/net/tipc/udp_media.h
index c06326a134db..281bbae87726 100644
--- a/net/tipc/udp_media.h
+++ b/net/tipc/udp_media.h
@@ -40,6 +40,7 @@
int tipc_udp_nl_bearer_add(struct tipc_bearer *b, struct nlattr *attr);
int tipc_udp_nl_add_bearer_data(struct tipc_nl_msg *msg, struct tipc_bearer *b);
+int tipc_udp_nl_dump_remoteip(struct sk_buff *skb, struct netlink_callback *cb);
#endif
#endif