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net: genetlink: push doit/dumpit code from genl_family_rcv_msg 

Currently the function genl_family_rcv_msg() is quite big. Since it is
quite convenient, push code that is related to doit and dumpit ops into
separate functions.

Do small changes on the way, like rc/err unification, NULL check etc.

Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jiri Pirko 2019-10-05 20:04:33 +02:00 committed by David S. Miller
parent 248d45f1e1
commit be064defab
1 changed files with 99 additions and 80 deletions
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111
net/netlink/genetlink.c
View File

@ -498,63 +498,33 @@ static int genl_lock_done(struct netlink_callback *cb)
return rc; return rc;
} }
static int genl_family_rcv_msg(const struct genl_family *family, static int genl_family_rcv_msg_dumpit(const struct genl_family *family,
struct sk_buff *skb, struct sk_buff *skb,
struct nlmsghdr *nlh, struct nlmsghdr *nlh,
struct netlink_ext_ack *extack) struct netlink_ext_ack *extack,
const struct genl_ops *ops,
int hdrlen, struct net *net)
{ {
const struct genl_ops *ops; int err;
struct net *net = sock_net(skb->sk);
struct genl_info info;
struct genlmsghdr *hdr = nlmsg_data(nlh);
struct nlattr **attrbuf;
int hdrlen, err;
/* this family doesn't exist in this netns */ if (!ops->dumpit)
if (!family->netnsok && !net_eq(net, &init_net))
return -ENOENT;
hdrlen = GENL_HDRLEN + family->hdrsize;
if (nlh->nlmsg_len < nlmsg_msg_size(hdrlen))
return -EINVAL;
ops = genl_get_cmd(hdr->cmd, family);
if (ops == NULL)
return -EOPNOTSUPP;
if ((ops->flags & GENL_ADMIN_PERM) &&
!netlink_capable(skb, CAP_NET_ADMIN))
return -EPERM;
if ((ops->flags & GENL_UNS_ADMIN_PERM) &&
!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN))
return -EPERM;
if ((nlh->nlmsg_flags & NLM_F_DUMP) == NLM_F_DUMP) {
int rc;
if (ops->dumpit == NULL)
return -EOPNOTSUPP; return -EOPNOTSUPP;
if (!(ops->validate & GENL_DONT_VALIDATE_DUMP)) { if (!(ops->validate & GENL_DONT_VALIDATE_DUMP)) {
int hdrlen = GENL_HDRLEN + family->hdrsize;
if (nlh->nlmsg_len < nlmsg_msg_size(hdrlen)) if (nlh->nlmsg_len < nlmsg_msg_size(hdrlen))
return -EINVAL; return -EINVAL;
if (family->maxattr) { if (family->maxattr) {
unsigned int validate = NL_VALIDATE_STRICT; unsigned int validate = NL_VALIDATE_STRICT;
if (ops->validate & if (ops->validate & GENL_DONT_VALIDATE_DUMP_STRICT)
GENL_DONT_VALIDATE_DUMP_STRICT)
validate = NL_VALIDATE_LIBERAL; validate = NL_VALIDATE_LIBERAL;
rc = __nla_validate(nlmsg_attrdata(nlh, hdrlen), err = __nla_validate(nlmsg_attrdata(nlh, hdrlen),
nlmsg_attrlen(nlh, hdrlen), nlmsg_attrlen(nlh, hdrlen),
family->maxattr, family->maxattr, family->policy,
family->policy,
validate, extack); validate, extack);
if (rc) if (err)
return rc; return err;
} }
} }
@ -569,7 +539,7 @@ static int genl_family_rcv_msg(const struct genl_family *family,
}; };
genl_unlock(); genl_unlock();
rc = __netlink_dump_start(net->genl_sock, skb, nlh, &c); err = __netlink_dump_start(net->genl_sock, skb, nlh, &c);
genl_lock(); genl_lock();
} else { } else {
@ -580,13 +550,24 @@ static int genl_family_rcv_msg(const struct genl_family *family,
.done = ops->done, .done = ops->done,
}; };
rc = __netlink_dump_start(net->genl_sock, skb, nlh, &c); err = __netlink_dump_start(net->genl_sock, skb, nlh, &c);
} }
return rc; return err;
} }
if (ops->doit == NULL) static int genl_family_rcv_msg_doit(const struct genl_family *family,
struct sk_buff *skb,
struct nlmsghdr *nlh,
struct netlink_ext_ack *extack,
const struct genl_ops *ops,
int hdrlen, struct net *net)
{
struct nlattr **attrbuf;
struct genl_info info;
int err;
if (!ops->doit)
return -EOPNOTSUPP; return -EOPNOTSUPP;
if (family->maxattr && family->parallel_ops) { if (family->maxattr && family->parallel_ops) {
@ -638,6 +619,44 @@ out:
return err; return err;
} }
static int genl_family_rcv_msg(const struct genl_family *family,
struct sk_buff *skb,
struct nlmsghdr *nlh,
struct netlink_ext_ack *extack)
{
const struct genl_ops *ops;
struct net *net = sock_net(skb->sk);
struct genlmsghdr *hdr = nlmsg_data(nlh);
int hdrlen;
/* this family doesn't exist in this netns */
if (!family->netnsok && !net_eq(net, &init_net))
return -ENOENT;
hdrlen = GENL_HDRLEN + family->hdrsize;
if (nlh->nlmsg_len < nlmsg_msg_size(hdrlen))
return -EINVAL;
ops = genl_get_cmd(hdr->cmd, family);
if (ops == NULL)
return -EOPNOTSUPP;
if ((ops->flags & GENL_ADMIN_PERM) &&
!netlink_capable(skb, CAP_NET_ADMIN))
return -EPERM;
if ((ops->flags & GENL_UNS_ADMIN_PERM) &&
!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN))
return -EPERM;
if ((nlh->nlmsg_flags & NLM_F_DUMP) == NLM_F_DUMP)
return genl_family_rcv_msg_dumpit(family, skb, nlh, extack,
ops, hdrlen, net);
else
return genl_family_rcv_msg_doit(family, skb, nlh, extack,
ops, hdrlen, net);
}
static int genl_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, static int genl_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
struct netlink_ext_ack *extack) struct netlink_ext_ack *extack)
{ {