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fou: implement FOU_CMD_GET

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Cc: Tom Herbert <tom@herbertland.com>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
WANG Cong 2015-04-10 12:00:30 -07:00 committed by David S. Miller
parent 02d793c5bb
commit 7a6c8c34e5
2 changed files with 110 additions and 0 deletions
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1
include/uapi/linux/fou.h
View file

@ -25,6 +25,7 @@ enum {
FOU_CMD_UNSPEC,
FOU_CMD_ADD,
FOU_CMD_DEL,
FOU_CMD_GET,
__FOU_CMD_MAX,
};

109
net/ipv4/fou.c
View file

@ -21,6 +21,7 @@ struct fou {
u8 protocol;
u8 flags;
__be16 port;
u16 type;
struct udp_offload udp_offloads;
struct list_head list;
};
@ -487,6 +488,8 @@ static int fou_create(struct net *net, struct fou_cfg *cfg,
goto error;
}
fou->type = cfg->type;
udp_sk(sk)->encap_type = 1;
udp_encap_enable();
@ -617,6 +620,106 @@ static int fou_nl_cmd_rm_port(struct sk_buff *skb, struct genl_info *info)
return fou_destroy(net, &cfg);
}
static int fou_fill_info(struct fou *fou, struct sk_buff *msg)
{
if (nla_put_u8(msg, FOU_ATTR_AF, fou->sock->sk->sk_family) ||
nla_put_be16(msg, FOU_ATTR_PORT, fou->port) ||
nla_put_u8(msg, FOU_ATTR_IPPROTO, fou->protocol) ||
nla_put_u8(msg, FOU_ATTR_TYPE, fou->type))
return -1;
if (fou->flags & FOU_F_REMCSUM_NOPARTIAL)
if (nla_put_flag(msg, FOU_ATTR_REMCSUM_NOPARTIAL))
return -1;
return 0;
}
static int fou_dump_info(struct fou *fou, u32 portid, u32 seq,
u32 flags, struct sk_buff *skb, u8 cmd)
{
void *hdr;
hdr = genlmsg_put(skb, portid, seq, &fou_nl_family, flags, cmd);
if (!hdr)
return -ENOMEM;
if (fou_fill_info(fou, skb) < 0)
goto nla_put_failure;
genlmsg_end(skb, hdr);
return 0;
nla_put_failure:
genlmsg_cancel(skb, hdr);
return -EMSGSIZE;
}
static int fou_nl_cmd_get_port(struct sk_buff *skb, struct genl_info *info)
{
struct net *net = genl_info_net(info);
struct fou_net *fn = net_generic(net, fou_net_id);
struct sk_buff *msg;
struct fou_cfg cfg;
struct fou *fout;
__be16 port;
int ret;
ret = parse_nl_config(info, &cfg);
if (ret)
return ret;
port = cfg.udp_config.local_udp_port;
if (port == 0)
return -EINVAL;
msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
if (!msg)
return -ENOMEM;
ret = -ESRCH;
mutex_lock(&fn->fou_lock);
list_for_each_entry(fout, &fn->fou_list, list) {
if (port == fout->port) {
ret = fou_dump_info(fout, info->snd_portid,
info->snd_seq, 0, msg,
info->genlhdr->cmd);
break;
}
}
mutex_unlock(&fn->fou_lock);
if (ret < 0)
goto out_free;
return genlmsg_reply(msg, info);
out_free:
nlmsg_free(msg);
return ret;
}
static int fou_nl_dump(struct sk_buff *skb, struct netlink_callback *cb)
{
struct net *net = sock_net(skb->sk);
struct fou_net *fn = net_generic(net, fou_net_id);
struct fou *fout;
int idx = 0, ret;
mutex_lock(&fn->fou_lock);
list_for_each_entry(fout, &fn->fou_list, list) {
if (idx++ < cb->args[0])
continue;
ret = fou_dump_info(fout, NETLINK_CB(cb->skb).portid,
cb->nlh->nlmsg_seq, NLM_F_MULTI,
skb, FOU_CMD_GET);
if (ret)
goto done;
}
mutex_unlock(&fn->fou_lock);
done:
cb->args[0] = idx;
return skb->len;
}
static const struct genl_ops fou_nl_ops[] = {
{
.cmd = FOU_CMD_ADD,
@ -630,6 +733,12 @@ static const struct genl_ops fou_nl_ops[] = {
.policy = fou_nl_policy,
.flags = GENL_ADMIN_PERM,
},
{
.cmd = FOU_CMD_GET,
.doit = fou_nl_cmd_get_port,
.dumpit = fou_nl_dump,
.policy = fou_nl_policy,
},
};
size_t fou_encap_hlen(struct ip_tunnel_encap *e)