diff options
Diffstat (limited to 'net/netlink/genetlink.c')
| -rw-r--r-- | net/netlink/genetlink.c | 78 |
1 files changed, 78 insertions, 0 deletions
diff --git a/net/netlink/genetlink.c b/net/netlink/genetlink.c index 9f357aa22b94..2f049692e012 100644 --- a/net/netlink/genetlink.c +++ b/net/netlink/genetlink.c @@ -1043,6 +1043,80 @@ static int genl_ctrl_event(int event, const struct genl_family *family, return 0; } +static int ctrl_dumppolicy(struct sk_buff *skb, struct netlink_callback *cb) +{ + const struct genl_family *rt; + unsigned int fam_id = cb->args[0]; + int err; + + if (!fam_id) { + struct nlattr *tb[CTRL_ATTR_MAX + 1]; + + err = genlmsg_parse(cb->nlh, &genl_ctrl, tb, + genl_ctrl.maxattr, + genl_ctrl.policy, cb->extack); + if (err) + return err; + + if (!tb[CTRL_ATTR_FAMILY_ID] && !tb[CTRL_ATTR_FAMILY_NAME]) + return -EINVAL; + + if (tb[CTRL_ATTR_FAMILY_ID]) { + fam_id = nla_get_u16(tb[CTRL_ATTR_FAMILY_ID]); + } else { + rt = genl_family_find_byname( + nla_data(tb[CTRL_ATTR_FAMILY_NAME])); + if (!rt) + return -ENOENT; + fam_id = rt->id; + } + } + + rt = genl_family_find_byid(fam_id); + if (!rt) + return -ENOENT; + + if (!rt->policy) + return -ENODATA; + + err = netlink_policy_dump_start(rt->policy, rt->maxattr, &cb->args[1]); + if (err) + return err; + + while (netlink_policy_dump_loop(&cb->args[1])) { + void *hdr; + struct nlattr *nest; + + hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, + cb->nlh->nlmsg_seq, &genl_ctrl, + NLM_F_MULTI, CTRL_CMD_GETPOLICY); + if (!hdr) + goto nla_put_failure; + + if (nla_put_u16(skb, CTRL_ATTR_FAMILY_ID, rt->id)) + goto nla_put_failure; + + nest = nla_nest_start(skb, CTRL_ATTR_POLICY); + if (!nest) + goto nla_put_failure; + + if (netlink_policy_dump_write(skb, cb->args[1])) + goto nla_put_failure; + + nla_nest_end(skb, nest); + + genlmsg_end(skb, hdr); + continue; + +nla_put_failure: + genlmsg_cancel(skb, hdr); + break; + } + + cb->args[0] = fam_id; + return skb->len; +} + static const struct genl_ops genl_ctrl_ops[] = { { .cmd = CTRL_CMD_GETFAMILY, @@ -1050,6 +1124,10 @@ static const struct genl_ops genl_ctrl_ops[] = { .doit = ctrl_getfamily, .dumpit = ctrl_dumpfamily, }, + { + .cmd = CTRL_CMD_GETPOLICY, + .dumpit = ctrl_dumppolicy, + }, }; static const struct genl_multicast_group genl_ctrl_groups[] = { |