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net: Don't return invalid table id error when dumping all families 

When doing a route dump across all address families, do not error out
if the table does not exist. This allows a route dump for AF_UNSPEC
with a table id that may only exist for some of the families.

Do return the table does not exist error if dumping routes for a
specific family and the table does not exist.

Signed-off-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Ahern 2018-10-24 12:59:01 -07:00 committed by David S. Miller
parent 242afaa696
commit ae677bbb44
5 changed files with 14 additions and 0 deletions
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1
include/net/ip_fib.h
View File

@ -226,6 +226,7 @@ struct fib_dump_filter {
u32 table_id;
/* filter_set is an optimization that an entry is set */
bool filter_set;
bool dump_all_families;
unsigned char protocol;
unsigned char rt_type;
unsigned int flags;

4
net/ipv4/fib_frontend.c
View File

@ -829,6 +829,7 @@ int ip_valid_fib_dump_req(struct net *net, const struct nlmsghdr *nlh,
return -EINVAL;
}
filter->dump_all_families = (rtm->rtm_family == AF_UNSPEC);
filter->flags = rtm->rtm_flags;
filter->protocol = rtm->rtm_protocol;
filter->rt_type = rtm->rtm_type;
@ -899,6 +900,9 @@ static int inet_dump_fib(struct sk_buff *skb, struct netlink_callback *cb)
if (filter.table_id) {
tb = fib_get_table(net, filter.table_id);
if (!tb) {
if (filter.dump_all_families)
return skb->len;
NL_SET_ERR_MSG(cb->extack, "ipv4: FIB table does not exist");
return -ENOENT;
}

3
net/ipv4/ipmr.c
View File

@ -2542,6 +2542,9 @@ static int ipmr_rtm_dumproute(struct sk_buff *skb, struct netlink_callback *cb)
mrt = ipmr_get_table(sock_net(skb->sk), filter.table_id);
if (!mrt) {
if (filter.dump_all_families)
return skb->len;
NL_SET_ERR_MSG(cb->extack, "ipv4: MR table does not exist");
return -ENOENT;
}

3
net/ipv6/ip6_fib.c
View File

@ -620,6 +620,9 @@ static int inet6_dump_fib(struct sk_buff *skb, struct netlink_callback *cb)
if (arg.filter.table_id) {
tb = fib6_get_table(net, arg.filter.table_id);
if (!tb) {
if (arg.filter.dump_all_families)
return skb->len;
NL_SET_ERR_MSG_MOD(cb->extack, "FIB table does not exist");
return -ENOENT;
}

3
net/ipv6/ip6mr.c
View File

@ -2473,6 +2473,9 @@ static int ip6mr_rtm_dumproute(struct sk_buff *skb, struct netlink_callback *cb)
mrt = ip6mr_get_table(sock_net(skb->sk), filter.table_id);
if (!mrt) {
if (filter.dump_all_families)
return skb->len;
NL_SET_ERR_MSG_MOD(cb->extack, "MR table does not exist");
return -ENOENT;
}