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net: Allow user to get table id from route lookup

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rt_fill_info which is called for 'route get' requests hardcodes the
table id as RT_TABLE_MAIN which is not correct when multiple tables
are used. Use the newly added table id in the rtable to send back
the correct table similar to what is done for IPv6.

To maintain current ABI a new request flag, RTM_F_LOOKUP_TABLE, is
added to indicate the actual table is wanted versus the hardcoded
response.

Signed-off-by: David Ahern <dsa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Ahern 2015-09-02 13:58:36 -07:00 committed by David S. Miller
parent b7503e0cdb
commit c36ba6603a
2 changed files with 9 additions and 4 deletions
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1
include/uapi/linux/rtnetlink.h
View File

@ -270,6 +270,7 @@ enum rt_scope_t {
#define RTM_F_CLONED 0x200 /* This route is cloned */
#define RTM_F_EQUALIZE 0x400 /* Multipath equalizer: NI */
#define RTM_F_PREFIX 0x800 /* Prefix addresses */
#define RTM_F_LOOKUP_TABLE 0x1000 /* set rtm_table to FIB lookup result */
/* Reserved table identifiers */

12
net/ipv4/route.c
View File

@ -2305,7 +2305,7 @@ struct rtable *ip_route_output_flow(struct net *net, struct flowi4 *flp4,
}
EXPORT_SYMBOL_GPL(ip_route_output_flow);
static int rt_fill_info(struct net *net, __be32 dst, __be32 src,
static int rt_fill_info(struct net *net, __be32 dst, __be32 src, u32 table_id,
struct flowi4 *fl4, struct sk_buff *skb, u32 portid,
u32 seq, int event, int nowait, unsigned int flags)
{
@ -2325,8 +2325,8 @@ static int rt_fill_info(struct net *net, __be32 dst, __be32 src,
r->rtm_dst_len = 32;
r->rtm_src_len = 0;
r->rtm_tos = fl4->flowi4_tos;
r->rtm_table = RT_TABLE_MAIN;
if (nla_put_u32(skb, RTA_TABLE, RT_TABLE_MAIN))
r->rtm_table = table_id;
if (nla_put_u32(skb, RTA_TABLE, table_id))
goto nla_put_failure;
r->rtm_type = rt->rt_type;
r->rtm_scope = RT_SCOPE_UNIVERSE;
@ -2431,6 +2431,7 @@ static int inet_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh)
int err;
int mark;
struct sk_buff *skb;
u32 table_id = RT_TABLE_MAIN;
err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv4_policy);
if (err < 0)
@ -2500,7 +2501,10 @@ static int inet_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh)
if (rtm->rtm_flags & RTM_F_NOTIFY)
rt->rt_flags |= RTCF_NOTIFY;
err = rt_fill_info(net, dst, src, &fl4, skb,
if (rtm->rtm_flags & RTM_F_LOOKUP_TABLE)
table_id = rt->rt_table_id;
err = rt_fill_info(net, dst, src, table_id, &fl4, skb,
NETLINK_CB(in_skb).portid, nlh->nlmsg_seq,
RTM_NEWROUTE, 0, 0);
if (err < 0)