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authorIdo Schimmel <idosch@nvidia.com>2024-07-15 16:23:53 +0200
committerPaolo Abeni <pabeni@redhat.com>2024-07-18 11:11:02 +0200
commit338bb57e4c2a1c2c6fc92f9c0bd35be7587adca7 (patch)
tree0ed0eb58ce8cee240c90bc302a00be4d74b213df /net/ipv4
parentnet: flow_dissector: use DEBUG_NET_WARN_ON_ONCE (diff)
downloadlinux-338bb57e4c2a1c2c6fc92f9c0bd35be7587adca7.tar.xz
linux-338bb57e4c2a1c2c6fc92f9c0bd35be7587adca7.zip
ipv4: Fix incorrect TOS in route get reply
The TOS value that is returned to user space in the route get reply is the one with which the lookup was performed ('fl4->flowi4_tos'). This is fine when the matched route is configured with a TOS as it would not match if its TOS value did not match the one with which the lookup was performed. However, matching on TOS is only performed when the route's TOS is not zero. It is therefore possible to have the kernel incorrectly return a non-zero TOS: # ip link add name dummy1 up type dummy # ip address add 192.0.2.1/24 dev dummy1 # ip route get 192.0.2.2 tos 0xfc 192.0.2.2 tos 0x1c dev dummy1 src 192.0.2.1 uid 0 cache Fix by adding a DSCP field to the FIB result structure (inside an existing 4 bytes hole), populating it in the route lookup and using it when filling the route get reply. Output after the patch: # ip link add name dummy1 up type dummy # ip address add 192.0.2.1/24 dev dummy1 # ip route get 192.0.2.2 tos 0xfc 192.0.2.2 dev dummy1 src 192.0.2.1 uid 0 cache Fixes: 1a00fee4ffb2 ("ipv4: Remove rt_key_{src,dst,tos} from struct rtable.") Signed-off-by: Ido Schimmel <idosch@nvidia.com> Reviewed-by: David Ahern <dsahern@kernel.org> Reviewed-by: Guillaume Nault <gnault@redhat.com> Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Diffstat (limited to 'net/ipv4')
-rw-r--r--net/ipv4/fib_trie.c1
-rw-r--r--net/ipv4/route.c14
2 files changed, 8 insertions, 7 deletions
diff --git a/net/ipv4/fib_trie.c b/net/ipv4/fib_trie.c
index f474106464d2..8f30e3f00b7f 100644
--- a/net/ipv4/fib_trie.c
+++ b/net/ipv4/fib_trie.c
@@ -1629,6 +1629,7 @@ set_result:
res->nhc = nhc;
res->type = fa->fa_type;
res->scope = fi->fib_scope;
+ res->dscp = fa->fa_dscp;
res->fi = fi;
res->table = tb;
res->fa_head = &n->leaf;
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 54512acbead7..82b8fe8faeb7 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -2867,9 +2867,9 @@ EXPORT_SYMBOL_GPL(ip_route_output_flow);
/* called with rcu_read_lock held */
static int rt_fill_info(struct net *net, __be32 dst, __be32 src,
- struct rtable *rt, u32 table_id, struct flowi4 *fl4,
- struct sk_buff *skb, u32 portid, u32 seq,
- unsigned int flags)
+ struct rtable *rt, u32 table_id, dscp_t dscp,
+ struct flowi4 *fl4, struct sk_buff *skb, u32 portid,
+ u32 seq, unsigned int flags)
{
struct rtmsg *r;
struct nlmsghdr *nlh;
@@ -2885,7 +2885,7 @@ static int rt_fill_info(struct net *net, __be32 dst, __be32 src,
r->rtm_family = AF_INET;
r->rtm_dst_len = 32;
r->rtm_src_len = 0;
- r->rtm_tos = fl4 ? fl4->flowi4_tos : 0;
+ r->rtm_tos = inet_dscp_to_dsfield(dscp);
r->rtm_table = table_id < 256 ? table_id : RT_TABLE_COMPAT;
if (nla_put_u32(skb, RTA_TABLE, table_id))
goto nla_put_failure;
@@ -3035,7 +3035,7 @@ static int fnhe_dump_bucket(struct net *net, struct sk_buff *skb,
goto next;
err = rt_fill_info(net, fnhe->fnhe_daddr, 0, rt,
- table_id, NULL, skb,
+ table_id, 0, NULL, skb,
NETLINK_CB(cb->skb).portid,
cb->nlh->nlmsg_seq, flags);
if (err)
@@ -3358,8 +3358,8 @@ static int inet_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh,
err = fib_dump_info(skb, NETLINK_CB(in_skb).portid,
nlh->nlmsg_seq, RTM_NEWROUTE, &fri, 0);
} else {
- err = rt_fill_info(net, dst, src, rt, table_id, &fl4, skb,
- NETLINK_CB(in_skb).portid,
+ err = rt_fill_info(net, dst, src, rt, table_id, res.dscp, &fl4,
+ skb, NETLINK_CB(in_skb).portid,
nlh->nlmsg_seq, 0);
}
if (err < 0)