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net/ipv6: Plumb support for filtering route dumps

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Implement kernel side filtering of routes by table id, egress device
index, protocol, and route type. If the table id is given in the filter,
lookup the table and call fib6_dump_table directly for it.

Move the existing route flags check for prefix only routes to the new
filter.

Signed-off-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Ahern
2018-10-15 18:56:44 -07:00
committed by David S. Miller
parent 18a8021a7b
commit 13e38901d4
2 changed files with 54 additions and 14 deletions
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28
net/ipv6/ip6_fib.c
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@@ -583,10 +583,12 @@ static int inet6_dump_fib(struct sk_buff *skb, struct netlink_callback *cb)
err = ip_valid_fib_dump_req(net, nlh, &arg.filter, cb->extack);
if (err < 0)
return err;
}
} else if (nlmsg_len(nlh) >= sizeof(struct rtmsg)) {
struct rtmsg *rtm = nlmsg_data(nlh);
s_h = cb->args[0];
s_e = cb->args[1];
if (rtm->rtm_flags & RTM_F_PREFIX)
arg.filter.flags = RTM_F_PREFIX;
}
w = (void *)cb->args[2];
if (!w) {
@@ -612,6 +614,20 @@ static int inet6_dump_fib(struct sk_buff *skb, struct netlink_callback *cb)
arg.net = net;
w->args = &arg;
if (arg.filter.table_id) {
tb = fib6_get_table(net, arg.filter.table_id);
if (!tb) {
NL_SET_ERR_MSG_MOD(cb->extack, "FIB table does not exist");
return -ENOENT;
}
res = fib6_dump_table(tb, skb, cb);
goto out;
}
s_h = cb->args[0];
s_e = cb->args[1];
rcu_read_lock();
for (h = s_h; h < FIB6_TABLE_HASHSZ; h++, s_e = 0) {
e = 0;
@@ -621,16 +637,16 @@ static int inet6_dump_fib(struct sk_buff *skb, struct netlink_callback *cb)
goto next;
res = fib6_dump_table(tb, skb, cb);
if (res != 0)
goto out;
goto out_unlock;
next:
e++;
}
}
out:
out_unlock:
rcu_read_unlock();
cb->args[1] = e;
cb->args[0] = h;
out:
res = res < 0 ? res : skb->len;
if (res <= 0)
fib6_dump_end(cb);