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tipc: add the ability to get UDP options via netlink

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Add UDP bearer options to netlink bearer get message. This is used by
the tipc user space tool to display UDP options.

The UDP bearer information is passed using either a sockaddr_in or
sockaddr_in6 structs. This means the user space receiver should
intermediately store the retrieved data in a large enough struct
(sockaddr_strage) before casting to the proper IP version type.

Signed-off-by: Richard Alpe <richard.alpe@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>
This commit is contained in:
Richard Alpe 2016-08-26 10:52:55 +02:00 committed by David S. Miller
parent c9b64d492b
commit fdb3accc2c
4 changed files with 72 additions and 0 deletions
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2
include/uapi/linux/tipc_netlink.h
View File

@ -61,6 +61,7 @@ enum {
TIPC_NL_MON_PEER_GET,
TIPC_NL_PEER_REMOVE,
TIPC_NL_BEARER_ADD,
TIPC_NL_UDP_GET_REMOTEIP,
__TIPC_NL_CMD_MAX,
TIPC_NL_CMD_MAX = __TIPC_NL_CMD_MAX - 1
@ -100,6 +101,7 @@ enum {
TIPC_NLA_UDP_UNSPEC,
TIPC_NLA_UDP_LOCAL, /* sockaddr_storage */
TIPC_NLA_UDP_REMOTE, /* sockaddr_storage */
TIPC_NLA_UDP_MULTI_REMOTEIP, /* flag */
__TIPC_NLA_UDP_MAX,
TIPC_NLA_UDP_MAX = __TIPC_NLA_UDP_MAX - 1

8
net/tipc/bearer.c
View File

@ -712,6 +712,14 @@ static int __tipc_nl_add_bearer(struct tipc_nl_msg *msg,
goto prop_msg_full;
nla_nest_end(msg->skb, prop);
#ifdef CONFIG_TIPC_MEDIA_UDP
if (bearer->media->type_id == TIPC_MEDIA_TYPE_UDP) {
if (tipc_udp_nl_add_bearer_data(msg, bearer))
goto attr_msg_full;
}
#endif
nla_nest_end(msg->skb, attrs);
genlmsg_end(msg->skb, hdr);

61
net/tipc/udp_media.c
View File

@ -401,6 +401,67 @@ static int enable_mcast(struct udp_bearer *ub, struct udp_media_addr *remote)
return err;
}
static int __tipc_nl_add_udp_addr(struct sk_buff *skb,
struct udp_media_addr *addr, int nla_t)
{
if (ntohs(addr->proto) == ETH_P_IP) {
struct sockaddr_in ip4;
ip4.sin_family = AF_INET;
ip4.sin_port = addr->port;
ip4.sin_addr.s_addr = addr->ipv4.s_addr;
if (nla_put(skb, nla_t, sizeof(ip4), &ip4))
return -EMSGSIZE;
#if IS_ENABLED(CONFIG_IPV6)
} else if (ntohs(addr->proto) == ETH_P_IPV6) {
struct sockaddr_in6 ip6;
ip6.sin6_family = AF_INET6;
ip6.sin6_port = addr->port;
memcpy(&ip6.sin6_addr, &addr->ipv6, sizeof(struct in6_addr));
if (nla_put(skb, nla_t, sizeof(ip6), &ip6))
return -EMSGSIZE;
#endif
}
return 0;
}
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;
struct udp_media_addr *dst;
struct udp_bearer *ub;
struct nlattr *nest;
ub = rcu_dereference_rtnl(b->media_ptr);
if (!ub)
return -ENODEV;
nest = nla_nest_start(msg->skb, TIPC_NLA_BEARER_UDP_OPTS);
if (!nest)
goto msg_full;
if (__tipc_nl_add_udp_addr(msg->skb, src, TIPC_NLA_UDP_LOCAL))
goto msg_full;
dst = (struct udp_media_addr *)&b->bcast_addr.value;
if (__tipc_nl_add_udp_addr(msg->skb, dst, TIPC_NLA_UDP_REMOTE))
goto msg_full;
if (!list_empty(&ub->rcast.list)) {
if (nla_put_flag(msg->skb, TIPC_NLA_UDP_MULTI_REMOTEIP))
goto msg_full;
}
nla_nest_end(msg->skb, nest);
return 0;
msg_full:
nla_nest_cancel(msg->skb, nest);
return -EMSGSIZE;
}
/**
* tipc_parse_udp_addr - build udp media address from netlink data
* @nlattr: netlink attribute containing sockaddr storage aligned address

1
net/tipc/udp_media.h
View File

@ -39,6 +39,7 @@
#define _TIPC_UDP_MEDIA_H
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);
#endif
#endif