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charset="utf-8" In this commit, we make ip_route_input_slow() support skb drop reason by adding the pointer of drop reason to its functions aeguments. Following new skb drop reasons are added: SKB_DROP_REASON_IP_LOCAL_SOURCE SKB_DROP_REASON_IP_INVALID_SOURCE SKB_DROP_REASON_IP_INVALID_DEST SKB_DROP_REASON_IP_LOCALNET Signed-off-by: Menglong Dong --- include/net/dropreason-core.h | 19 +++++++++++++++++++ net/ipv4/route.c | 32 ++++++++++++++++++++++++-------- 2 files changed, 43 insertions(+), 8 deletions(-) diff --git a/include/net/dropreason-core.h b/include/net/dropreason-core.h index 4748680e8c88..3d1b09f70bbd 100644 --- a/include/net/dropreason-core.h +++ b/include/net/dropreason-core.h @@ -76,6 +76,10 @@ FN(INVALID_PROTO) \ FN(IP_INADDRERRORS) \ FN(IP_INNOROUTES) \ + FN(IP_LOCAL_SOURCE) \ + FN(IP_INVALID_SOURCE) \ + FN(IP_INVALID_DEST) \ + FN(IP_LOCALNET) \ FN(PKT_TOO_BIG) \ FN(DUP_FRAG) \ FN(FRAG_REASM_TIMEOUT) \ @@ -365,6 +369,21 @@ enum skb_drop_reason { * IPSTATS_MIB_INADDRERRORS */ SKB_DROP_REASON_IP_INNOROUTES, + /** @SKB_DROP_REASON_IP_LOCAL_SOURCE: the source ip is local */ + SKB_DROP_REASON_IP_LOCAL_SOURCE, + /** + * @SKB_DROP_REASON_IP_INVALID_SOURCE: the source ip is invalid: + * 1) source ip is multicast or limited broadcast + * 2) source ip is zero and not IGMP + */ + SKB_DROP_REASON_IP_INVALID_SOURCE, + /** + * @SKB_DROP_REASON_IP_INVALID_DEST: the dest ip is invalid: + * 1) dest ip is 0 + */ + SKB_DROP_REASON_IP_INVALID_DEST, + /** @SKB_DROP_REASON_IP_LOCALNET: source or dest ip is local net */ + SKB_DROP_REASON_IP_LOCALNET, /** * @SKB_DROP_REASON_PKT_TOO_BIG: packet size is too big (maybe exceed the * MTU) diff --git a/net/ipv4/route.c b/net/ipv4/route.c index 385efe6d71a7..ab70917c62e5 100644 --- a/net/ipv4/route.c +++ b/net/ipv4/route.c @@ -2202,8 +2202,10 @@ static struct net_device *ip_rt_get_dev(struct net *= net, =20 static int ip_route_input_slow(struct sk_buff *skb, __be32 daddr, __be32 s= addr, u8 tos, struct net_device *dev, - struct fib_result *res) + struct fib_result *res, + enum skb_drop_reason *reason) { + enum skb_drop_reason __reason =3D SKB_DROP_REASON_NOT_SPECIFIED; struct in_device *in_dev =3D __in_dev_get_rcu(dev); struct flow_keys *flkeys =3D NULL, _flkeys; struct net *net =3D dev_net(dev); @@ -2231,8 +2233,10 @@ static int ip_route_input_slow(struct sk_buff *skb, = __be32 daddr, __be32 saddr, fl4.flowi4_tun_key.tun_id =3D 0; skb_dst_drop(skb); =20 - if (ipv4_is_multicast(saddr) || ipv4_is_lbcast(saddr)) + if (ipv4_is_multicast(saddr) || ipv4_is_lbcast(saddr)) { + __reason =3D SKB_DROP_REASON_IP_INVALID_SOURCE; goto martian_source; + } =20 res->fi =3D NULL; res->table =3D NULL; @@ -2242,21 +2246,29 @@ static int ip_route_input_slow(struct sk_buff *skb,= __be32 daddr, __be32 saddr, /* Accept zero addresses only to limited broadcast; * I even do not know to fix it or not. Waiting for complains :-) */ - if (ipv4_is_zeronet(saddr)) + if (ipv4_is_zeronet(saddr)) { + __reason =3D SKB_DROP_REASON_IP_INVALID_SOURCE; goto martian_source; + } =20 - if (ipv4_is_zeronet(daddr)) + if (ipv4_is_zeronet(daddr)) { + __reason =3D SKB_DROP_REASON_IP_INVALID_DEST; goto martian_destination; + } =20 /* Following code try to avoid calling IN_DEV_NET_ROUTE_LOCALNET(), * and call it once if daddr or/and saddr are loopback addresses */ if (ipv4_is_loopback(daddr)) { - if (!IN_DEV_NET_ROUTE_LOCALNET(in_dev, net)) + if (!IN_DEV_NET_ROUTE_LOCALNET(in_dev, net)) { + __reason =3D SKB_DROP_REASON_IP_LOCALNET; goto martian_destination; + } } else if (ipv4_is_loopback(saddr)) { - if (!IN_DEV_NET_ROUTE_LOCALNET(in_dev, net)) + if (!IN_DEV_NET_ROUTE_LOCALNET(in_dev, net)) { + __reason =3D SKB_DROP_REASON_IP_LOCALNET; goto martian_source; + } } =20 /* @@ -2315,7 +2327,10 @@ static int ip_route_input_slow(struct sk_buff *skb, = __be32 daddr, __be32 saddr, =20 make_route: err =3D ip_mkroute_input(skb, res, in_dev, daddr, saddr, tos, flkeys); -out: return err; +out: + if (reason && err) + *reason =3D __reason; + return err; =20 brd_input: if (skb->protocol !=3D htons(ETH_P_IP)) @@ -2406,6 +2421,7 @@ out: return err; =20 e_nobufs: err =3D -ENOBUFS; + __reason =3D SKB_DROP_REASON_NOMEM; goto out; =20 martian_source: @@ -2462,7 +2478,7 @@ static int ip_route_input_rcu(struct sk_buff *skb, __= be32 daddr, __be32 saddr, return err; } =20 - return ip_route_input_slow(skb, daddr, saddr, tos, dev, res); + return ip_route_input_slow(skb, daddr, saddr, tos, dev, res, reason); } =20 int ip_route_input_noref(struct sk_buff *skb, __be32 daddr, __be32 saddr, --=20 2.39.5