static int tipc_nl_compat_recv(struct sk_buff *skb, struct genl_info *info)
{
int err;
int len;
struct tipc_nl_compat_msg msg;
struct nlmsghdr *req_nlh;
struct nlmsghdr *rep_nlh;
struct tipc_genlmsghdr *req_userhdr = info->userhdr;
struct net *net = genl_info_net(info);
memset(&msg, 0, sizeof(msg));
req_nlh = (struct nlmsghdr *)skb->data;
msg.req = nlmsg_data(req_nlh) + GENL_HDRLEN + TIPC_GENL_HDRLEN;
msg.cmd = req_userhdr->cmd;
msg.dst_sk = info->dst_sk;
if ((msg.cmd & 0xC000) && (!netlink_net_capable(skb, CAP_NET_ADMIN))) {
msg.rep = tipc_get_err_tlv(TIPC_CFG_NOT_NET_ADMIN);
err = -EACCES;
goto send;
}
len = nlmsg_attrlen(req_nlh, GENL_HDRLEN + TIPC_GENL_HDRLEN);
if (TLV_GET_LEN(msg.req) && !TLV_OK(msg.req, len)) {
msg.rep = tipc_get_err_tlv(TIPC_CFG_NOT_SUPPORTED);
err = -EOPNOTSUPP;
goto send;
}
err = tipc_nl_compat_handle(&msg);
if (err == -EOPNOTSUPP)
msg.rep = tipc_get_err_tlv(TIPC_CFG_NOT_SUPPORTED);
else if (err == -EINVAL)
msg.rep = tipc_get_err_tlv(TIPC_CFG_TLV_ERROR);
send:
if (!msg.rep)
return err;
len = nlmsg_total_size(GENL_HDRLEN + TIPC_GENL_HDRLEN);
skb_push(msg.rep, len);
rep_nlh = nlmsg_hdr(msg.rep);
memcpy(rep_nlh, info->nlhdr, len);
rep_nlh->nlmsg_len = msg.rep->len;
genlmsg_unicast(net, msg.rep, NETLINK_CB(skb).portid);
return err;
}
static int tipc_tlv_sprintf(struct sk_buff *skb, const char *fmt, ...)
{
int n;
u16 len;
u32 rem;
char *buf;
struct tlv_desc *tlv;
va_list args;
rem = tipc_skb_tailroom(skb);
tlv = (struct tlv_desc *)skb->data;
len = TLV_GET_LEN(tlv);
buf = TLV_DATA(tlv) + len;
va_start(args, fmt);
n = vscnprintf(buf, rem, fmt, args);
va_end(args);
TLV_SET_LEN(tlv, n + len);
skb_put(skb, n);
return n;
}
static inline int TLV_GET_DATA_LEN(struct tlv_desc *tlv)
{
return TLV_GET_LEN(tlv) - TLV_SPACE(0);
}
