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Thu, 24 Oct 2024 02:34:46 -0700 (PDT) From: Menglong Dong X-Google-Original-From: Menglong Dong To: pabeni@redhat.com Cc: davem@davemloft.net, edumazet@google.com, kuba@kernel.org, dsahern@kernel.org, pablo@netfilter.org, kadlec@netfilter.org, roopa@nvidia.com, razor@blackwall.org, gnault@redhat.com, bigeasy@linutronix.de, idosch@nvidia.com, ast@kernel.org, dongml2@chinatelecom.cn, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, netfilter-devel@vger.kernel.org, coreteam@netfilter.org, bridge@lists.linux.dev, bpf@vger.kernel.org Subject: [PATCH bpf-next v4 1/9] net: ip: make fib_validate_source() support drop reasons Date: Thu, 24 Oct 2024 17:33:40 +0800 Message-Id: <20241024093348.353245-2-dongml2@chinatelecom.cn> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20241024093348.353245-1-dongml2@chinatelecom.cn> References: <20241024093348.353245-1-dongml2@chinatelecom.cn> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" In this commit, we make fib_validate_source() and __fib_validate_source() return -reason instead of errno on error. The return value of fib_validate_source can be -errno, 0, and 1. It's hard to make fib_validate_source() return drop reasons directly. The fib_validate_source() will return 1 if the scope of the source(revert) route is HOST. And the __mkroute_input() will mark the skb with IPSKB_DOREDIRECT in this case (combine with some other conditions). And then, a REDIRECT ICMP will be sent in ip_forward() if this flag exists. We can't pass this information to __mkroute_input if we make fib_validate_source() return drop reasons. Therefore, we introduce the wrapper fib_validate_source_reason() for fib_validate_source(), which will return the drop reasons on error. In the origin logic, LINUX_MIB_IPRPFILTER will be counted if fib_validate_source() return -EXDEV. And now, we need to adjust it by checking "reason =3D=3D SKB_DROP_REASON_IP_RPFILTER". However, this will ta= ke effect only after the patch "net: ip: make ip_route_input_noref() return drop reasons", as we can't pass the drop reasons from fib_validate_source() to ip_rcv_finish_core() in this patch. Following new drop reasons are added in this patch: SKB_DROP_REASON_IP_LOCAL_SOURCE SKB_DROP_REASON_IP_INVALID_SOURCE Signed-off-by: Menglong Dong --- v4: - don't refactor fib_validate_source/__fib_validate_source, and introduce a wrapper for fib_validate_source() instead. v2: - make fib_validate_source() return drop reasons, instead of -reason. --- include/net/dropreason-core.h | 10 ++++++++++ include/net/ip_fib.h | 12 ++++++++++++ net/ipv4/fib_frontend.c | 17 ++++++++++++----- net/ipv4/ip_input.c | 4 +--- net/ipv4/route.c | 33 +++++++++++++++++++-------------- 5 files changed, 54 insertions(+), 22 deletions(-) diff --git a/include/net/dropreason-core.h b/include/net/dropreason-core.h index d59bb96c5a02..62a60be1db84 100644 --- a/include/net/dropreason-core.h +++ b/include/net/dropreason-core.h @@ -76,6 +76,8 @@ FN(INVALID_PROTO) \ FN(IP_INADDRERRORS) \ FN(IP_INNOROUTES) \ + FN(IP_LOCAL_SOURCE) \ + FN(IP_INVALID_SOURCE) \ FN(PKT_TOO_BIG) \ FN(DUP_FRAG) \ FN(FRAG_REASM_TIMEOUT) \ @@ -373,6 +375,14 @@ 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_PKT_TOO_BIG: packet size is too big (maybe exceed the * MTU) diff --git a/include/net/ip_fib.h b/include/net/ip_fib.h index b6e44f4eaa4c..a113c11ab56b 100644 --- a/include/net/ip_fib.h +++ b/include/net/ip_fib.h @@ -452,6 +452,18 @@ int fib_validate_source(struct sk_buff *skb, __be32 sr= c, __be32 dst, dscp_t dscp, int oif, struct net_device *dev, struct in_device *idev, u32 *itag); =20 +static inline enum skb_drop_reason +fib_validate_source_reason(struct sk_buff *skb, __be32 src, __be32 dst, + dscp_t dscp, int oif, struct net_device *dev, + struct in_device *idev, u32 *itag) +{ + int err =3D fib_validate_source(skb, src, dst, dscp, oif, dev, idev, + itag); + if (err < 0) + return -err; + return SKB_NOT_DROPPED_YET; +} + #ifdef CONFIG_IP_ROUTE_CLASSID static inline int fib_num_tclassid_users(struct net *net) { diff --git a/net/ipv4/fib_frontend.c b/net/ipv4/fib_frontend.c index 53bd26315df5..99dddfab95b9 100644 --- a/net/ipv4/fib_frontend.c +++ b/net/ipv4/fib_frontend.c @@ -346,6 +346,7 @@ static int __fib_validate_source(struct sk_buff *skb, _= _be32 src, __be32 dst, int rpf, struct in_device *idev, u32 *itag) { struct net *net =3D dev_net(dev); + enum skb_drop_reason reason; struct flow_keys flkeys; int ret, no_addr; struct fib_result res; @@ -377,9 +378,15 @@ static int __fib_validate_source(struct sk_buff *skb, = __be32 src, __be32 dst, =20 if (fib_lookup(net, &fl4, &res, 0)) goto last_resort; - if (res.type !=3D RTN_UNICAST && - (res.type !=3D RTN_LOCAL || !IN_DEV_ACCEPT_LOCAL(idev))) - goto e_inval; + if (res.type !=3D RTN_UNICAST) { + if (res.type !=3D RTN_LOCAL) { + reason =3D SKB_DROP_REASON_IP_INVALID_SOURCE; + goto e_inval; + } else if (!IN_DEV_ACCEPT_LOCAL(idev)) { + reason =3D SKB_DROP_REASON_IP_LOCAL_SOURCE; + goto e_inval; + } + } fib_combine_itag(itag, &res); =20 dev_match =3D fib_info_nh_uses_dev(res.fi, dev); @@ -412,9 +419,9 @@ static int __fib_validate_source(struct sk_buff *skb, _= _be32 src, __be32 dst, return 0; =20 e_inval: - return -EINVAL; + return -reason; e_rpf: - return -EXDEV; + return -SKB_DROP_REASON_IP_RPFILTER; } =20 /* Ignore rp_filter for packets protected by IPsec. */ diff --git a/net/ipv4/ip_input.c b/net/ipv4/ip_input.c index 89bb63da6852..c40a26972884 100644 --- a/net/ipv4/ip_input.c +++ b/net/ipv4/ip_input.c @@ -425,10 +425,8 @@ static int ip_rcv_finish_core(struct net *net, struct = sock *sk, return NET_RX_DROP; =20 drop_error: - if (err =3D=3D -EXDEV) { - drop_reason =3D SKB_DROP_REASON_IP_RPFILTER; + if (drop_reason =3D=3D SKB_DROP_REASON_IP_RPFILTER) __NET_INC_STATS(net, LINUX_MIB_IPRPFILTER); - } goto drop; } =20 diff --git a/net/ipv4/route.c b/net/ipv4/route.c index 18a08b4f4a5a..3e7a3e947b7d 100644 --- a/net/ipv4/route.c +++ b/net/ipv4/route.c @@ -1669,7 +1669,7 @@ int ip_mc_validate_source(struct sk_buff *skb, __be32= daddr, __be32 saddr, dscp_t dscp, struct net_device *dev, struct in_device *in_dev, u32 *itag) { - int err; + enum skb_drop_reason reason; =20 /* Primary sanity checks. */ if (!in_dev) @@ -1687,10 +1687,10 @@ int ip_mc_validate_source(struct sk_buff *skb, __be= 32 daddr, __be32 saddr, ip_hdr(skb)->protocol !=3D IPPROTO_IGMP) return -EINVAL; } else { - err =3D fib_validate_source(skb, saddr, 0, dscp, 0, dev, in_dev, - itag); - if (err < 0) - return err; + reason =3D fib_validate_source_reason(skb, saddr, 0, dscp, 0, + dev, in_dev, itag); + if (reason) + return -EINVAL; } return 0; } @@ -1788,6 +1788,7 @@ static int __mkroute_input(struct sk_buff *skb, const= struct fib_result *res, err =3D fib_validate_source(skb, saddr, daddr, dscp, FIB_RES_OIF(*res), in_dev->dev, in_dev, &itag); if (err < 0) { + err =3D -EINVAL; ip_handle_martian_source(in_dev->dev, in_dev, skb, daddr, saddr); =20 @@ -2140,6 +2141,7 @@ int ip_route_use_hint(struct sk_buff *skb, __be32 dad= dr, __be32 saddr, struct in_device *in_dev =3D __in_dev_get_rcu(dev); struct rtable *rt =3D skb_rtable(hint); struct net *net =3D dev_net(dev); + enum skb_drop_reason reason; int err =3D -EINVAL; u32 tag =3D 0; =20 @@ -2158,9 +2160,9 @@ int ip_route_use_hint(struct sk_buff *skb, __be32 dad= dr, __be32 saddr, if (rt->rt_type !=3D RTN_LOCAL) goto skip_validate_source; =20 - err =3D fib_validate_source(skb, saddr, daddr, dscp, 0, dev, in_dev, - &tag); - if (err < 0) + reason =3D fib_validate_source_reason(skb, saddr, daddr, dscp, 0, dev, + in_dev, &tag); + if (reason) goto martian_source; =20 skip_validate_source: @@ -2202,6 +2204,7 @@ static int ip_route_input_slow(struct sk_buff *skb, _= _be32 daddr, __be32 saddr, dscp_t dscp, struct net_device *dev, struct fib_result *res) { + 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); @@ -2296,10 +2299,11 @@ static int ip_route_input_slow(struct sk_buff *skb,= __be32 daddr, __be32 saddr, goto brd_input; } =20 + err =3D -EINVAL; if (res->type =3D=3D RTN_LOCAL) { - err =3D fib_validate_source(skb, saddr, daddr, dscp, 0, dev, - in_dev, &itag); - if (err < 0) + reason =3D fib_validate_source_reason(skb, saddr, daddr, dscp, + 0, dev, in_dev, &itag); + if (reason) goto martian_source; goto local_input; } @@ -2320,9 +2324,10 @@ out: return err; goto e_inval; =20 if (!ipv4_is_zeronet(saddr)) { - err =3D fib_validate_source(skb, saddr, 0, dscp, 0, dev, in_dev, - &itag); - if (err < 0) + err =3D -EINVAL; + reason =3D fib_validate_source_reason(skb, saddr, 0, dscp, 0, + dev, in_dev, &itag); + if (reason) goto martian_source; } flags |=3D RTCF_BROADCAST; --=20 2.39.5 From nobody Mon Nov 25 21:22:39 2024 Received: from mail-oa1-f66.google.com (mail-oa1-f66.google.com [209.85.160.66]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 2531B1BD028; 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Thu, 24 Oct 2024 02:34:51 -0700 (PDT) Received: from localhost.localdomain ([43.129.25.208]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-71ec1415071sm7600287b3a.217.2024.10.24.02.34.46 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 24 Oct 2024 02:34:51 -0700 (PDT) From: Menglong Dong X-Google-Original-From: Menglong Dong To: pabeni@redhat.com Cc: davem@davemloft.net, edumazet@google.com, kuba@kernel.org, dsahern@kernel.org, pablo@netfilter.org, kadlec@netfilter.org, roopa@nvidia.com, razor@blackwall.org, gnault@redhat.com, bigeasy@linutronix.de, idosch@nvidia.com, ast@kernel.org, dongml2@chinatelecom.cn, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, netfilter-devel@vger.kernel.org, coreteam@netfilter.org, bridge@lists.linux.dev, bpf@vger.kernel.org Subject: [PATCH bpf-next v4 2/9] net: ip: make ip_route_input_mc() return drop reason Date: Thu, 24 Oct 2024 17:33:41 +0800 Message-Id: <20241024093348.353245-3-dongml2@chinatelecom.cn> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20241024093348.353245-1-dongml2@chinatelecom.cn> References: <20241024093348.353245-1-dongml2@chinatelecom.cn> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Make ip_route_input_mc() return drop reason, and adjust the call of it in ip_route_input_rcu(). Signed-off-by: Menglong Dong --- net/ipv4/route.c | 21 +++++++++++---------- 1 file changed, 11 insertions(+), 10 deletions(-) diff --git a/net/ipv4/route.c b/net/ipv4/route.c index 3e7a3e947b7d..e579fe5bd3d3 100644 --- a/net/ipv4/route.c +++ b/net/ipv4/route.c @@ -1696,8 +1696,9 @@ int ip_mc_validate_source(struct sk_buff *skb, __be32= daddr, __be32 saddr, } =20 /* called in rcu_read_lock() section */ -static int ip_route_input_mc(struct sk_buff *skb, __be32 daddr, __be32 sad= dr, - dscp_t dscp, struct net_device *dev, int our) +static enum skb_drop_reason +ip_route_input_mc(struct sk_buff *skb, __be32 daddr, __be32 saddr, + dscp_t dscp, struct net_device *dev, int our) { struct in_device *in_dev =3D __in_dev_get_rcu(dev); unsigned int flags =3D RTCF_MULTICAST; @@ -1708,7 +1709,7 @@ static int ip_route_input_mc(struct sk_buff *skb, __b= e32 daddr, __be32 saddr, err =3D ip_mc_validate_source(skb, daddr, saddr, dscp, dev, in_dev, &itag); if (err) - return err; + return SKB_DROP_REASON_NOT_SPECIFIED; =20 if (our) flags |=3D RTCF_LOCAL; @@ -1719,7 +1720,7 @@ static int ip_route_input_mc(struct sk_buff *skb, __b= e32 daddr, __be32 saddr, rth =3D rt_dst_alloc(dev_net(dev)->loopback_dev, flags, RTN_MULTICAST, false); if (!rth) - return -ENOBUFS; + return SKB_DROP_REASON_NOMEM; =20 #ifdef CONFIG_IP_ROUTE_CLASSID rth->dst.tclassid =3D itag; @@ -1735,7 +1736,7 @@ static int ip_route_input_mc(struct sk_buff *skb, __b= e32 daddr, __be32 saddr, =20 skb_dst_drop(skb); skb_dst_set(skb, &rth->dst); - return 0; + return SKB_NOT_DROPPED_YET; } =20 =20 @@ -2433,12 +2434,12 @@ static int ip_route_input_rcu(struct sk_buff *skb, = __be32 daddr, __be32 saddr, * route cache entry is created eventually. */ if (ipv4_is_multicast(daddr)) { + enum skb_drop_reason reason =3D SKB_DROP_REASON_NOT_SPECIFIED; struct in_device *in_dev =3D __in_dev_get_rcu(dev); int our =3D 0; - int err =3D -EINVAL; =20 if (!in_dev) - return err; + return -EINVAL; our =3D ip_check_mc_rcu(in_dev, daddr, saddr, ip_hdr(skb)->protocol); 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Thu, 24 Oct 2024 02:34:57 -0700 (PDT) Received: from localhost.localdomain ([43.129.25.208]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-71ec1415071sm7600287b3a.217.2024.10.24.02.34.52 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 24 Oct 2024 02:34:56 -0700 (PDT) From: Menglong Dong X-Google-Original-From: Menglong Dong To: pabeni@redhat.com Cc: davem@davemloft.net, edumazet@google.com, kuba@kernel.org, dsahern@kernel.org, pablo@netfilter.org, kadlec@netfilter.org, roopa@nvidia.com, razor@blackwall.org, gnault@redhat.com, bigeasy@linutronix.de, idosch@nvidia.com, ast@kernel.org, dongml2@chinatelecom.cn, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, netfilter-devel@vger.kernel.org, coreteam@netfilter.org, bridge@lists.linux.dev, bpf@vger.kernel.org Subject: [PATCH bpf-next v4 3/9] net: ip: make ip_mc_validate_source() return drop reason Date: Thu, 24 Oct 2024 17:33:42 +0800 Message-Id: <20241024093348.353245-4-dongml2@chinatelecom.cn> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20241024093348.353245-1-dongml2@chinatelecom.cn> References: <20241024093348.353245-1-dongml2@chinatelecom.cn> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Make ip_mc_validate_source() return drop reason, and adjust the call of it in ip_route_input_mc(). Another caller of it is ip_rcv_finish_core->udp_v4_early_demux, and the errno is not checked in detail, so we don't do more adjustment for it. The drop reason "SKB_DROP_REASON_IP_LOCALNET" is added in this commit. Signed-off-by: Menglong Dong --- include/net/dropreason-core.h | 3 +++ include/net/route.h | 7 ++++--- net/ipv4/route.c | 35 +++++++++++++++++++---------------- 3 files changed, 26 insertions(+), 19 deletions(-) diff --git a/include/net/dropreason-core.h b/include/net/dropreason-core.h index 62a60be1db84..a2a1fb90e0e5 100644 --- a/include/net/dropreason-core.h +++ b/include/net/dropreason-core.h @@ -78,6 +78,7 @@ FN(IP_INNOROUTES) \ FN(IP_LOCAL_SOURCE) \ FN(IP_INVALID_SOURCE) \ + FN(IP_LOCALNET) \ FN(PKT_TOO_BIG) \ FN(DUP_FRAG) \ FN(FRAG_REASM_TIMEOUT) \ @@ -383,6 +384,8 @@ enum skb_drop_reason { * 2) source ip is zero and not IGMP */ SKB_DROP_REASON_IP_INVALID_SOURCE, + /** @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/include/net/route.h b/include/net/route.h index 586e59f7ed8a..a828a17a6313 100644 --- a/include/net/route.h +++ b/include/net/route.h @@ -199,9 +199,10 @@ static inline struct rtable *ip_route_output_gre(struc= t net *net, struct flowi4 return ip_route_output_key(net, fl4); } =20 -int ip_mc_validate_source(struct sk_buff *skb, __be32 daddr, __be32 saddr, - dscp_t dscp, struct net_device *dev, - struct in_device *in_dev, u32 *itag); +enum skb_drop_reason +ip_mc_validate_source(struct sk_buff *skb, __be32 daddr, __be32 saddr, + dscp_t dscp, struct net_device *dev, + struct in_device *in_dev, u32 *itag); int ip_route_input_noref(struct sk_buff *skb, __be32 daddr, __be32 saddr, dscp_t dscp, struct net_device *dev); int ip_route_use_hint(struct sk_buff *skb, __be32 daddr, __be32 saddr, diff --git a/net/ipv4/route.c b/net/ipv4/route.c index e579fe5bd3d3..61e316f93291 100644 --- a/net/ipv4/route.c +++ b/net/ipv4/route.c @@ -1665,34 +1665,37 @@ struct rtable *rt_dst_clone(struct net_device *dev,= struct rtable *rt) EXPORT_SYMBOL(rt_dst_clone); =20 /* called in rcu_read_lock() section */ -int ip_mc_validate_source(struct sk_buff *skb, __be32 daddr, __be32 saddr, - dscp_t dscp, struct net_device *dev, - struct in_device *in_dev, u32 *itag) +enum skb_drop_reason +ip_mc_validate_source(struct sk_buff *skb, __be32 daddr, __be32 saddr, + dscp_t dscp, struct net_device *dev, + struct in_device *in_dev, u32 *itag) { enum skb_drop_reason reason; =20 /* Primary sanity checks. */ if (!in_dev) - return -EINVAL; + return SKB_DROP_REASON_NOT_SPECIFIED; =20 - if (ipv4_is_multicast(saddr) || ipv4_is_lbcast(saddr) || - skb->protocol !=3D htons(ETH_P_IP)) - return -EINVAL; + if (ipv4_is_multicast(saddr) || ipv4_is_lbcast(saddr)) + return SKB_DROP_REASON_IP_INVALID_SOURCE; + + if (skb->protocol !=3D htons(ETH_P_IP)) + return SKB_DROP_REASON_INVALID_PROTO; =20 if (ipv4_is_loopback(saddr) && !IN_DEV_ROUTE_LOCALNET(in_dev)) - return -EINVAL; + return SKB_DROP_REASON_IP_LOCALNET; =20 if (ipv4_is_zeronet(saddr)) { if (!ipv4_is_local_multicast(daddr) && ip_hdr(skb)->protocol !=3D IPPROTO_IGMP) - return -EINVAL; + return SKB_DROP_REASON_IP_INVALID_SOURCE; } else { reason =3D fib_validate_source_reason(skb, saddr, 0, dscp, 0, dev, in_dev, itag); if (reason) - return -EINVAL; + return reason; } - return 0; + return SKB_NOT_DROPPED_YET; } =20 /* called in rcu_read_lock() section */ @@ -1702,14 +1705,14 @@ ip_route_input_mc(struct sk_buff *skb, __be32 daddr= , __be32 saddr, { struct in_device *in_dev =3D __in_dev_get_rcu(dev); 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Thu, 24 Oct 2024 02:35:02 -0700 (PDT) Received: from localhost.localdomain ([43.129.25.208]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-71ec1415071sm7600287b3a.217.2024.10.24.02.34.57 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 24 Oct 2024 02:35:02 -0700 (PDT) From: Menglong Dong X-Google-Original-From: Menglong Dong To: pabeni@redhat.com Cc: davem@davemloft.net, edumazet@google.com, kuba@kernel.org, dsahern@kernel.org, pablo@netfilter.org, kadlec@netfilter.org, roopa@nvidia.com, razor@blackwall.org, gnault@redhat.com, bigeasy@linutronix.de, idosch@nvidia.com, ast@kernel.org, dongml2@chinatelecom.cn, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, netfilter-devel@vger.kernel.org, coreteam@netfilter.org, bridge@lists.linux.dev, bpf@vger.kernel.org Subject: [PATCH bpf-next v4 4/9] net: ip: make ip_route_input_slow() return drop reasons Date: Thu, 24 Oct 2024 17:33:43 +0800 Message-Id: <20241024093348.353245-5-dongml2@chinatelecom.cn> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20241024093348.353245-1-dongml2@chinatelecom.cn> References: <20241024093348.353245-1-dongml2@chinatelecom.cn> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" In this commit, we make ip_route_input_slow() return skb drop reasons, and following new skb drop reasons are added: SKB_DROP_REASON_IP_INVALID_DEST The only caller of ip_route_input_slow() is ip_route_input_rcu(), and we adjust it by making it return -EINVAL on error. Signed-off-by: Menglong Dong --- v4: - use indentation after the out label --- include/net/dropreason-core.h | 6 ++++ net/ipv4/route.c | 56 ++++++++++++++++++++++------------- 2 files changed, 41 insertions(+), 21 deletions(-) diff --git a/include/net/dropreason-core.h b/include/net/dropreason-core.h index a2a1fb90e0e5..74624d369d48 100644 --- a/include/net/dropreason-core.h +++ b/include/net/dropreason-core.h @@ -79,6 +79,7 @@ FN(IP_LOCAL_SOURCE) \ FN(IP_INVALID_SOURCE) \ FN(IP_LOCALNET) \ + FN(IP_INVALID_DEST) \ FN(PKT_TOO_BIG) \ FN(DUP_FRAG) \ FN(FRAG_REASM_TIMEOUT) \ @@ -386,6 +387,11 @@ enum skb_drop_reason { SKB_DROP_REASON_IP_INVALID_SOURCE, /** @SKB_DROP_REASON_IP_LOCALNET: source or dest ip is local net */ SKB_DROP_REASON_IP_LOCALNET, + /** + * @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_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 61e316f93291..7976f687d039 100644 --- a/net/ipv4/route.c +++ b/net/ipv4/route.c @@ -2204,9 +2204,10 @@ static struct net_device *ip_rt_get_dev(struct net *= net, * called with rcu_read_lock() */ =20 -static int ip_route_input_slow(struct sk_buff *skb, __be32 daddr, __be32 s= addr, - dscp_t dscp, struct net_device *dev, - struct fib_result *res) +static enum skb_drop_reason +ip_route_input_slow(struct sk_buff *skb, __be32 daddr, __be32 saddr, + dscp_t dscp, struct net_device *dev, + struct fib_result *res) { enum skb_drop_reason reason =3D SKB_DROP_REASON_NOT_SPECIFIED; struct in_device *in_dev =3D __in_dev_get_rcu(dev); @@ -2236,8 +2237,10 @@ 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; @@ -2247,21 +2250,29 @@ 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 /* @@ -2316,19 +2327,26 @@ static int ip_route_input_slow(struct sk_buff *skb,= __be32 daddr, __be32 saddr, err =3D -EHOSTUNREACH; goto no_route; } - if (res->type !=3D RTN_UNICAST) + if (res->type !=3D RTN_UNICAST) { + reason =3D SKB_DROP_REASON_IP_INVALID_DEST; goto martian_destination; + } =20 make_route: err =3D ip_mkroute_input(skb, res, in_dev, daddr, saddr, dscp, flkeys); -out: return err; + if (!err) + reason =3D SKB_NOT_DROPPED_YET; + +out: + return reason; =20 brd_input: - if (skb->protocol !=3D htons(ETH_P_IP)) - goto e_inval; + if (skb->protocol !=3D htons(ETH_P_IP)) { + reason =3D SKB_DROP_REASON_INVALID_PROTO; + goto out; + } =20 if (!ipv4_is_zeronet(saddr)) { - err =3D -EINVAL; reason =3D fib_validate_source_reason(skb, saddr, 0, dscp, 0, dev, in_dev, &itag); if (reason) @@ -2349,7 +2367,7 @@ out: return err; rth =3D rcu_dereference(nhc->nhc_rth_input); if (rt_cache_valid(rth)) { skb_dst_set_noref(skb, &rth->dst); - err =3D 0; + reason =3D SKB_NOT_DROPPED_YET; goto out; } } @@ -2386,7 +2404,7 @@ out: return err; rt_add_uncached_list(rth); } skb_dst_set(skb, &rth->dst); - err =3D 0; + reason =3D SKB_NOT_DROPPED_YET; goto out; =20 no_route: @@ -2407,12 +2425,8 @@ out: return err; &daddr, &saddr, dev->name); #endif =20 -e_inval: - err =3D -EINVAL; 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Thu, 24 Oct 2024 02:35:09 -0700 (PDT) Received: from localhost.localdomain ([43.129.25.208]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-71ec1415071sm7600287b3a.217.2024.10.24.02.35.03 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 24 Oct 2024 02:35:08 -0700 (PDT) From: Menglong Dong X-Google-Original-From: Menglong Dong To: pabeni@redhat.com Cc: davem@davemloft.net, edumazet@google.com, kuba@kernel.org, dsahern@kernel.org, pablo@netfilter.org, kadlec@netfilter.org, roopa@nvidia.com, razor@blackwall.org, gnault@redhat.com, bigeasy@linutronix.de, idosch@nvidia.com, ast@kernel.org, dongml2@chinatelecom.cn, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, netfilter-devel@vger.kernel.org, coreteam@netfilter.org, bridge@lists.linux.dev, bpf@vger.kernel.org Subject: [PATCH bpf-next v4 5/9] net: ip: make ip_route_input_rcu() return drop reasons Date: Thu, 24 Oct 2024 17:33:44 +0800 Message-Id: <20241024093348.353245-6-dongml2@chinatelecom.cn> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20241024093348.353245-1-dongml2@chinatelecom.cn> References: <20241024093348.353245-1-dongml2@chinatelecom.cn> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" In this commit, we make ip_route_input_rcu() return drop reasons, which come from ip_route_input_mc() and ip_route_input_slow(). The only caller of ip_route_input_rcu() is ip_route_input_noref(). We adjust it by making it return -EINVAL on error and ignore the reasons that ip_route_input_rcu() returns. In the following patch, we will make ip_route_input_noref() returns the drop reasons. Signed-off-by: Menglong Dong --- v4: - collapse the 2 lines that we modify in inet_rtm_getroute() --- net/ipv4/route.c | 19 ++++++++++--------- 1 file changed, 10 insertions(+), 9 deletions(-) diff --git a/net/ipv4/route.c b/net/ipv4/route.c index 7976f687d039..4b0daf3510d7 100644 --- a/net/ipv4/route.c +++ b/net/ipv4/route.c @@ -2435,9 +2435,10 @@ ip_route_input_slow(struct sk_buff *skb, __be32 dadd= r, __be32 saddr, } =20 /* called with rcu_read_lock held */ -static int ip_route_input_rcu(struct sk_buff *skb, __be32 daddr, __be32 sa= ddr, - dscp_t dscp, struct net_device *dev, - struct fib_result *res) +static enum skb_drop_reason +ip_route_input_rcu(struct sk_buff *skb, __be32 daddr, __be32 saddr, + dscp_t dscp, struct net_device *dev, + struct fib_result *res) { /* Multicast recognition logic is moved from route cache to here. * The problem was that too many Ethernet cards have broken/missing @@ -2480,23 +2481,23 @@ static int ip_route_input_rcu(struct sk_buff *skb, = __be32 daddr, __be32 saddr, reason =3D ip_route_input_mc(skb, daddr, saddr, dscp, dev, our); } - return reason ? -EINVAL : 0; + return reason; } =20 - return ip_route_input_slow(skb, daddr, saddr, dscp, dev, res) ? -EINVAL := 0; + return ip_route_input_slow(skb, daddr, saddr, dscp, dev, res); } =20 int ip_route_input_noref(struct sk_buff *skb, __be32 daddr, __be32 saddr, dscp_t dscp, struct net_device *dev) { + enum skb_drop_reason reason; struct fib_result res; - int err; =20 rcu_read_lock(); - err =3D ip_route_input_rcu(skb, daddr, saddr, dscp, dev, &res); + reason =3D ip_route_input_rcu(skb, daddr, saddr, dscp, dev, &res); rcu_read_unlock(); =20 - return err; + return reason ? -EINVAL : 0; } EXPORT_SYMBOL(ip_route_input_noref); =20 @@ -3308,7 +3309,7 @@ static int inet_rtm_getroute(struct sk_buff *in_skb, = struct nlmsghdr *nlh, skb->mark =3D mark; err =3D ip_route_input_rcu(skb, dst, src, inet_dsfield_to_dscp(rtm->rtm_tos), - dev, &res); + dev, &res) ? -EINVAL : 0; =20 rt =3D skb_rtable(skb); if (err =3D=3D 0 && rt->dst.error) --=20 2.39.5 From nobody Mon Nov 25 21:22:39 2024 Received: from mail-pg1-f194.google.com (mail-pg1-f194.google.com [209.85.215.194]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7912B1B85DF; 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Thu, 24 Oct 2024 02:35:14 -0700 (PDT) Received: from localhost.localdomain ([43.129.25.208]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-71ec1415071sm7600287b3a.217.2024.10.24.02.35.09 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 24 Oct 2024 02:35:14 -0700 (PDT) From: Menglong Dong X-Google-Original-From: Menglong Dong To: pabeni@redhat.com Cc: davem@davemloft.net, edumazet@google.com, kuba@kernel.org, dsahern@kernel.org, pablo@netfilter.org, kadlec@netfilter.org, roopa@nvidia.com, razor@blackwall.org, gnault@redhat.com, bigeasy@linutronix.de, idosch@nvidia.com, ast@kernel.org, dongml2@chinatelecom.cn, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, netfilter-devel@vger.kernel.org, coreteam@netfilter.org, bridge@lists.linux.dev, bpf@vger.kernel.org Subject: [PATCH bpf-next v4 6/9] net: ip: make ip_route_input_noref() return drop reasons Date: Thu, 24 Oct 2024 17:33:45 +0800 Message-Id: <20241024093348.353245-7-dongml2@chinatelecom.cn> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20241024093348.353245-1-dongml2@chinatelecom.cn> References: <20241024093348.353245-1-dongml2@chinatelecom.cn> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" In this commit, we make ip_route_input_noref() return drop reasons, which come from ip_route_input_rcu(). We need adjust the callers of ip_route_input_noref() to make sure the return value of ip_route_input_noref() is used properly. The errno that ip_route_input_noref() returns comes from ip_route_input and bpf_lwt_input_reroute in the origin logic, and we make them return -EINVAL on error instead. In the following patch, we will make ip_route_input() returns drop reasons too. Signed-off-by: Menglong Dong --- v4: - introduce the variable "reason" in bpf_lwt_input_reroute() to make things clear --- include/net/route.h | 15 ++++++++------- net/core/lwt_bpf.c | 6 ++++-- net/ipv4/ip_fragment.c | 12 +++++++----- net/ipv4/ip_input.c | 7 ++++--- net/ipv4/route.c | 7 ++++--- 5 files changed, 27 insertions(+), 20 deletions(-) diff --git a/include/net/route.h b/include/net/route.h index a828a17a6313..11674f7c6be6 100644 --- a/include/net/route.h +++ b/include/net/route.h @@ -203,8 +203,9 @@ enum skb_drop_reason ip_mc_validate_source(struct sk_buff *skb, __be32 daddr, __be32 saddr, dscp_t dscp, struct net_device *dev, struct in_device *in_dev, u32 *itag); -int ip_route_input_noref(struct sk_buff *skb, __be32 daddr, __be32 saddr, - dscp_t dscp, struct net_device *dev); +enum skb_drop_reason +ip_route_input_noref(struct sk_buff *skb, __be32 daddr, __be32 saddr, + dscp_t dscp, struct net_device *dev); int ip_route_use_hint(struct sk_buff *skb, __be32 daddr, __be32 saddr, dscp_t dscp, struct net_device *dev, const struct sk_buff *hint); @@ -212,18 +213,18 @@ int ip_route_use_hint(struct sk_buff *skb, __be32 dad= dr, __be32 saddr, static inline int ip_route_input(struct sk_buff *skb, __be32 dst, __be32 s= rc, dscp_t dscp, struct net_device *devin) { - int err; + enum skb_drop_reason reason; =20 rcu_read_lock(); - err =3D ip_route_input_noref(skb, dst, src, dscp, devin); - if (!err) { + reason =3D ip_route_input_noref(skb, dst, src, dscp, devin); + if (!reason) { skb_dst_force(skb); if (!skb_dst(skb)) - err =3D -EINVAL; + reason =3D SKB_DROP_REASON_NOT_SPECIFIED; } rcu_read_unlock(); =20 - return err; + return reason ? -EINVAL : 0; } =20 void ipv4_update_pmtu(struct sk_buff *skb, struct net *net, u32 mtu, int o= if, diff --git a/net/core/lwt_bpf.c b/net/core/lwt_bpf.c index e0ca24a58810..8a78bff53b2c 100644 --- a/net/core/lwt_bpf.c +++ b/net/core/lwt_bpf.c @@ -88,6 +88,7 @@ static int run_lwt_bpf(struct sk_buff *skb, struct bpf_lw= t_prog *lwt, =20 static int bpf_lwt_input_reroute(struct sk_buff *skb) { + enum skb_drop_reason reason; int err =3D -EINVAL; =20 if (skb->protocol =3D=3D htons(ETH_P_IP)) { @@ -96,8 +97,9 @@ static int bpf_lwt_input_reroute(struct sk_buff *skb) =20 dev_hold(dev); skb_dst_drop(skb); - err =3D ip_route_input_noref(skb, iph->daddr, iph->saddr, - ip4h_dscp(iph), dev); + reason =3D ip_route_input_noref(skb, iph->daddr, iph->saddr, + ip4h_dscp(iph), dev); + err =3D reason ? -EINVAL : 0; dev_put(dev); } else if (skb->protocol =3D=3D htons(ETH_P_IPV6)) { skb_dst_drop(skb); diff --git a/net/ipv4/ip_fragment.c b/net/ipv4/ip_fragment.c index 48e2810f1f27..52b991e976ba 100644 --- a/net/ipv4/ip_fragment.c +++ b/net/ipv4/ip_fragment.c @@ -132,12 +132,12 @@ static bool frag_expire_skip_icmp(u32 user) */ static void ip_expire(struct timer_list *t) { + enum skb_drop_reason reason =3D SKB_DROP_REASON_FRAG_REASM_TIMEOUT; struct inet_frag_queue *frag =3D from_timer(frag, t, timer); const struct iphdr *iph; struct sk_buff *head =3D NULL; struct net *net; struct ipq *qp; - int err; =20 qp =3D container_of(frag, struct ipq, q); net =3D qp->q.fqdir->net; @@ -175,10 +175,12 @@ static void ip_expire(struct timer_list *t) =20 /* skb has no dst, perform route lookup again */ iph =3D ip_hdr(head); - err =3D ip_route_input_noref(head, iph->daddr, iph->saddr, ip4h_dscp(iph), - head->dev); - if (err) + reason =3D ip_route_input_noref(head, iph->daddr, iph->saddr, + ip4h_dscp(iph), head->dev); + if (reason) goto out; + else + reason =3D SKB_DROP_REASON_FRAG_REASM_TIMEOUT; =20 /* Only an end host needs to send an ICMP * "Fragment Reassembly Timeout" message, per RFC792. @@ -195,7 +197,7 @@ static void ip_expire(struct timer_list *t) spin_unlock(&qp->q.lock); out_rcu_unlock: rcu_read_unlock(); - kfree_skb_reason(head, SKB_DROP_REASON_FRAG_REASM_TIMEOUT); + kfree_skb_reason(head, reason); ipq_put(qp); } =20 diff --git a/net/ipv4/ip_input.c b/net/ipv4/ip_input.c index c40a26972884..513eb0c6435a 100644 --- a/net/ipv4/ip_input.c +++ b/net/ipv4/ip_input.c @@ -362,10 +362,11 @@ static int ip_rcv_finish_core(struct net *net, struct= sock *sk, * how the packet travels inside Linux networking. */ if (!skb_valid_dst(skb)) { - err =3D ip_route_input_noref(skb, iph->daddr, iph->saddr, - ip4h_dscp(iph), dev); - if (unlikely(err)) + drop_reason =3D ip_route_input_noref(skb, iph->daddr, iph->saddr, + ip4h_dscp(iph), dev); + if (unlikely(drop_reason)) goto drop_error; + drop_reason =3D SKB_DROP_REASON_NOT_SPECIFIED; } else { struct in_device *in_dev =3D __in_dev_get_rcu(dev); =20 diff --git a/net/ipv4/route.c b/net/ipv4/route.c index 4b0daf3510d7..757526e450fd 100644 --- a/net/ipv4/route.c +++ b/net/ipv4/route.c @@ -2487,8 +2487,9 @@ ip_route_input_rcu(struct sk_buff *skb, __be32 daddr,= __be32 saddr, return ip_route_input_slow(skb, daddr, saddr, dscp, dev, res); } =20 -int ip_route_input_noref(struct sk_buff *skb, __be32 daddr, __be32 saddr, - dscp_t dscp, struct net_device *dev) +enum skb_drop_reason ip_route_input_noref(struct sk_buff *skb, __be32 dadd= r, + __be32 saddr, dscp_t dscp, + struct net_device *dev) { enum skb_drop_reason reason; struct fib_result res; @@ -2497,7 +2498,7 @@ int ip_route_input_noref(struct sk_buff *skb, __be32 = daddr, __be32 saddr, reason =3D ip_route_input_rcu(skb, daddr, saddr, dscp, dev, &res); 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Thu, 24 Oct 2024 02:35:19 -0700 (PDT) From: Menglong Dong X-Google-Original-From: Menglong Dong To: pabeni@redhat.com Cc: davem@davemloft.net, edumazet@google.com, kuba@kernel.org, dsahern@kernel.org, pablo@netfilter.org, kadlec@netfilter.org, roopa@nvidia.com, razor@blackwall.org, gnault@redhat.com, bigeasy@linutronix.de, idosch@nvidia.com, ast@kernel.org, dongml2@chinatelecom.cn, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, netfilter-devel@vger.kernel.org, coreteam@netfilter.org, bridge@lists.linux.dev, bpf@vger.kernel.org Subject: [PATCH bpf-next v4 7/9] net: ip: make ip_route_input() return drop reasons Date: Thu, 24 Oct 2024 17:33:46 +0800 Message-Id: <20241024093348.353245-8-dongml2@chinatelecom.cn> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20241024093348.353245-1-dongml2@chinatelecom.cn> References: <20241024093348.353245-1-dongml2@chinatelecom.cn> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" In this commit, we make ip_route_input() return skb drop reasons that come from ip_route_input_noref(). Meanwhile, adjust all the call to it. Signed-off-by: Menglong Dong --- v4: - replace the variable "err" with "reason" for the return value of ip_route_input() --- include/net/route.h | 7 ++++--- net/bridge/br_netfilter_hooks.c | 11 ++++++----- net/ipv4/icmp.c | 2 +- net/ipv4/ip_options.c | 2 +- net/ipv6/seg6_local.c | 14 +++++++------- 5 files changed, 19 insertions(+), 17 deletions(-) diff --git a/include/net/route.h b/include/net/route.h index 11674f7c6be6..f4ab5412c9c9 100644 --- a/include/net/route.h +++ b/include/net/route.h @@ -210,8 +210,9 @@ int ip_route_use_hint(struct sk_buff *skb, __be32 daddr= , __be32 saddr, dscp_t dscp, struct net_device *dev, const struct sk_buff *hint); =20 -static inline int ip_route_input(struct sk_buff *skb, __be32 dst, __be32 s= rc, - dscp_t dscp, struct net_device *devin) +static inline enum skb_drop_reason +ip_route_input(struct sk_buff *skb, __be32 dst, __be32 src, dscp_t dscp, + struct net_device *devin) { enum skb_drop_reason reason; =20 @@ -224,7 +225,7 @@ static inline int ip_route_input(struct sk_buff *skb, _= _be32 dst, __be32 src, } rcu_read_unlock(); =20 - return reason ? -EINVAL : 0; + return reason; } =20 void ipv4_update_pmtu(struct sk_buff *skb, struct net *net, u32 mtu, int o= if, diff --git a/net/bridge/br_netfilter_hooks.c b/net/bridge/br_netfilter_hook= s.c index 17a5f5923d61..110cffc24a1d 100644 --- a/net/bridge/br_netfilter_hooks.c +++ b/net/bridge/br_netfilter_hooks.c @@ -373,8 +373,8 @@ static int br_nf_pre_routing_finish(struct net *net, st= ruct sock *sk, struct sk_ struct nf_bridge_info *nf_bridge =3D nf_bridge_info_get(skb); struct net_device *dev =3D skb->dev, *br_indev; const struct iphdr *iph =3D ip_hdr(skb); + enum skb_drop_reason reason; struct rtable *rt; - int err; =20 br_indev =3D nf_bridge_get_physindev(skb, net); if (!br_indev) { @@ -390,9 +390,9 @@ static int br_nf_pre_routing_finish(struct net *net, st= ruct sock *sk, struct sk_ } nf_bridge->in_prerouting =3D 0; if (br_nf_ipv4_daddr_was_changed(skb, nf_bridge)) { - err =3D ip_route_input(skb, iph->daddr, iph->saddr, - ip4h_dscp(iph), dev); - if (err) { + reason =3D ip_route_input(skb, iph->daddr, iph->saddr, + ip4h_dscp(iph), dev); + if (reason) { struct in_device *in_dev =3D __in_dev_get_rcu(dev); =20 /* If err equals -EHOSTUNREACH the error is due to a @@ -402,7 +402,8 @@ static int br_nf_pre_routing_finish(struct net *net, st= ruct sock *sk, struct sk_ * martian destinations: loopback destinations and destination * 0.0.0.0. In both cases the packet will be dropped because the * destination is the loopback device and not the bridge. */ - if (err !=3D -EHOSTUNREACH || !in_dev || IN_DEV_FORWARD(in_dev)) + if (reason !=3D SKB_DROP_REASON_IP_INADDRERRORS || !in_dev || + IN_DEV_FORWARD(in_dev)) goto free_skb; =20 rt =3D ip_route_output(net, iph->daddr, 0, diff --git a/net/ipv4/icmp.c b/net/ipv4/icmp.c index 23664434922e..69ea33f64a54 100644 --- a/net/ipv4/icmp.c +++ b/net/ipv4/icmp.c @@ -545,7 +545,7 @@ static struct rtable *icmp_route_lookup(struct net *net= , struct flowi4 *fl4, orefdst =3D skb_in->_skb_refdst; /* save old refdst */ skb_dst_set(skb_in, NULL); err =3D ip_route_input(skb_in, fl4_dec.daddr, fl4_dec.saddr, - dscp, rt2->dst.dev); + dscp, rt2->dst.dev) ? -EINVAL : 0; =20 dst_release(&rt2->dst); rt2 =3D skb_rtable(skb_in); diff --git a/net/ipv4/ip_options.c b/net/ipv4/ip_options.c index 81e86e5defee..e3321932bec0 100644 --- a/net/ipv4/ip_options.c +++ b/net/ipv4/ip_options.c @@ -618,7 +618,7 @@ int ip_options_rcv_srr(struct sk_buff *skb, struct net_= device *dev) orefdst =3D skb->_skb_refdst; skb_dst_set(skb, NULL); err =3D ip_route_input(skb, nexthop, iph->saddr, ip4h_dscp(iph), - dev); + dev) ? -EINVAL : 0; rt2 =3D skb_rtable(skb); if (err || (rt2->rt_type !=3D RTN_UNICAST && rt2->rt_type !=3D RTN_LOCAL= )) { skb_dst_drop(skb); diff --git a/net/ipv6/seg6_local.c b/net/ipv6/seg6_local.c index c74705ead984..ac1dbd492c22 100644 --- a/net/ipv6/seg6_local.c +++ b/net/ipv6/seg6_local.c @@ -954,10 +954,10 @@ static int input_action_end_dx4_finish(struct net *ne= t, struct sock *sk, struct sk_buff *skb) { struct dst_entry *orig_dst =3D skb_dst(skb); + enum skb_drop_reason reason; struct seg6_local_lwt *slwt; struct iphdr *iph; __be32 nhaddr; - int err; =20 slwt =3D seg6_local_lwtunnel(orig_dst->lwtstate); =20 @@ -967,9 +967,9 @@ static int input_action_end_dx4_finish(struct net *net,= struct sock *sk, =20 skb_dst_drop(skb); =20 - err =3D ip_route_input(skb, nhaddr, iph->saddr, 0, skb->dev); - if (err) { - kfree_skb(skb); + reason =3D ip_route_input(skb, nhaddr, iph->saddr, 0, skb->dev); 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Thu, 24 Oct 2024 02:35:25 -0700 (PDT) Received: from localhost.localdomain ([43.129.25.208]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-71ec1415071sm7600287b3a.217.2024.10.24.02.35.20 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 24 Oct 2024 02:35:24 -0700 (PDT) From: Menglong Dong X-Google-Original-From: Menglong Dong To: pabeni@redhat.com Cc: davem@davemloft.net, edumazet@google.com, kuba@kernel.org, dsahern@kernel.org, pablo@netfilter.org, kadlec@netfilter.org, roopa@nvidia.com, razor@blackwall.org, gnault@redhat.com, bigeasy@linutronix.de, idosch@nvidia.com, ast@kernel.org, dongml2@chinatelecom.cn, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, netfilter-devel@vger.kernel.org, coreteam@netfilter.org, bridge@lists.linux.dev, bpf@vger.kernel.org Subject: [PATCH bpf-next v4 8/9] net: ip: make ip_mkroute_input/__mkroute_input return drop reasons Date: Thu, 24 Oct 2024 17:33:47 +0800 Message-Id: <20241024093348.353245-9-dongml2@chinatelecom.cn> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20241024093348.353245-1-dongml2@chinatelecom.cn> References: <20241024093348.353245-1-dongml2@chinatelecom.cn> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" In this commit, we make ip_mkroute_input() and __mkroute_input() return drop reasons. The drop reason "SKB_DROP_REASON_ARP_PVLAN_DISABLE" is introduced for the case: the packet which is not IP is forwarded to the in_dev, and the proxy_arp_pvlan is not enabled. This name is ugly, and I have not figure out a suitable name for this case yet :/ Signed-off-by: Menglong Dong --- include/net/dropreason-core.h | 7 +++++++ net/ipv4/route.c | 35 +++++++++++++++++++---------------- 2 files changed, 26 insertions(+), 16 deletions(-) diff --git a/include/net/dropreason-core.h b/include/net/dropreason-core.h index 74624d369d48..6c5a1ea209a2 100644 --- a/include/net/dropreason-core.h +++ b/include/net/dropreason-core.h @@ -104,6 +104,7 @@ FN(IP_TUNNEL_ECN) \ FN(TUNNEL_TXINFO) \ FN(LOCAL_MAC) \ + FN(ARP_PVLAN_DISABLE) \ FNe(MAX) =20 /** @@ -477,6 +478,12 @@ enum skb_drop_reason { * the MAC address of the local netdev. */ SKB_DROP_REASON_LOCAL_MAC, + /** + * @SKB_DROP_REASON_ARP_PVLAN_DISABLE: packet which is not IP is + * forwarded to the in_dev, and the proxy_arp_pvlan is not + * enabled. + */ + SKB_DROP_REASON_ARP_PVLAN_DISABLE, /** * @SKB_DROP_REASON_MAX: the maximum of core drop reasons, which * shouldn't be used as a real 'reason' - only for tracing code gen diff --git a/net/ipv4/route.c b/net/ipv4/route.c index 757526e450fd..d47d7ae9fc61 100644 --- a/net/ipv4/route.c +++ b/net/ipv4/route.c @@ -1769,10 +1769,12 @@ static void ip_handle_martian_source(struct net_dev= ice *dev, } =20 /* called in rcu_read_lock() section */ -static int __mkroute_input(struct sk_buff *skb, const struct fib_result *r= es, - struct in_device *in_dev, __be32 daddr, - __be32 saddr, dscp_t dscp) +static enum skb_drop_reason +__mkroute_input(struct sk_buff *skb, const struct fib_result *res, + struct in_device *in_dev, __be32 daddr, + __be32 saddr, dscp_t dscp) { + enum skb_drop_reason reason =3D SKB_DROP_REASON_NOT_SPECIFIED; struct fib_nh_common *nhc =3D FIB_RES_NHC(*res); struct net_device *dev =3D nhc->nhc_dev; struct fib_nh_exception *fnhe; @@ -1786,13 +1788,13 @@ static int __mkroute_input(struct sk_buff *skb, con= st struct fib_result *res, out_dev =3D __in_dev_get_rcu(dev); if (!out_dev) { net_crit_ratelimited("Bug in ip_route_input_slow(). Please report.\n"); - return -EINVAL; + return reason; } =20 err =3D fib_validate_source(skb, saddr, daddr, dscp, FIB_RES_OIF(*res), in_dev->dev, in_dev, &itag); if (err < 0) { - err =3D -EINVAL; + reason =3D -err; ip_handle_martian_source(in_dev->dev, in_dev, skb, daddr, saddr); =20 @@ -1820,7 +1822,8 @@ static int __mkroute_input(struct sk_buff *skb, const= struct fib_result *res, */ if (out_dev =3D=3D in_dev && IN_DEV_PROXY_ARP_PVLAN(in_dev) =3D=3D 0) { - err =3D -EINVAL; + /* what do we name this situation? */ + reason =3D SKB_DROP_REASON_ARP_PVLAN_DISABLE; goto cleanup; } } @@ -1843,7 +1846,7 @@ static int __mkroute_input(struct sk_buff *skb, const= struct fib_result *res, rth =3D rt_dst_alloc(out_dev->dev, 0, res->type, IN_DEV_ORCONF(out_dev, NOXFRM)); if (!rth) { - err =3D -ENOBUFS; + reason =3D SKB_DROP_REASON_NOMEM; goto cleanup; } =20 @@ -1857,9 +1860,9 @@ static int __mkroute_input(struct sk_buff *skb, const= struct fib_result *res, lwtunnel_set_redirect(&rth->dst); skb_dst_set(skb, &rth->dst); out: - err =3D 0; - cleanup: - return err; + reason =3D SKB_NOT_DROPPED_YET; +cleanup: + return reason; } =20 #ifdef CONFIG_IP_ROUTE_MULTIPATH @@ -2117,9 +2120,10 @@ int fib_multipath_hash(const struct net *net, const = struct flowi4 *fl4, } #endif /* CONFIG_IP_ROUTE_MULTIPATH */ =20 -static int ip_mkroute_input(struct sk_buff *skb, struct fib_result *res, - struct in_device *in_dev, __be32 daddr, - __be32 saddr, dscp_t dscp, struct flow_keys *hkeys) +static enum skb_drop_reason +ip_mkroute_input(struct sk_buff *skb, struct fib_result *res, + struct in_device *in_dev, __be32 daddr, + __be32 saddr, dscp_t dscp, struct flow_keys *hkeys) { #ifdef CONFIG_IP_ROUTE_MULTIPATH if (res->fi && fib_info_num_path(res->fi) > 1) { @@ -2333,9 +2337,8 @@ 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, dscp, flkeys); - if (!err) - reason =3D SKB_NOT_DROPPED_YET; + reason =3D ip_mkroute_input(skb, res, in_dev, daddr, saddr, dscp, + flkeys); 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Thu, 24 Oct 2024 02:35:30 -0700 (PDT) From: Menglong Dong X-Google-Original-From: Menglong Dong To: pabeni@redhat.com Cc: davem@davemloft.net, edumazet@google.com, kuba@kernel.org, dsahern@kernel.org, pablo@netfilter.org, kadlec@netfilter.org, roopa@nvidia.com, razor@blackwall.org, gnault@redhat.com, bigeasy@linutronix.de, idosch@nvidia.com, ast@kernel.org, dongml2@chinatelecom.cn, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, netfilter-devel@vger.kernel.org, coreteam@netfilter.org, bridge@lists.linux.dev, bpf@vger.kernel.org Subject: [PATCH bpf-next v4 9/9] net: ip: make ip_route_use_hint() return drop reasons Date: Thu, 24 Oct 2024 17:33:48 +0800 Message-Id: <20241024093348.353245-10-dongml2@chinatelecom.cn> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20241024093348.353245-1-dongml2@chinatelecom.cn> References: <20241024093348.353245-1-dongml2@chinatelecom.cn> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" In this commit, we make ip_route_use_hint() return drop reasons. The drop reasons that we return are similar to what we do in ip_route_input_slow(), and no drop reasons are added in this commit. Signed-off-by: Menglong Dong --- include/net/route.h | 7 ++++--- net/ipv4/ip_input.c | 9 ++++----- net/ipv4/route.c | 26 ++++++++++++++++---------- 3 files changed, 24 insertions(+), 18 deletions(-) diff --git a/include/net/route.h b/include/net/route.h index f4ab5412c9c9..4debc335d276 100644 --- a/include/net/route.h +++ b/include/net/route.h @@ -206,9 +206,10 @@ ip_mc_validate_source(struct sk_buff *skb, __be32 dadd= r, __be32 saddr, enum skb_drop_reason ip_route_input_noref(struct sk_buff *skb, __be32 daddr, __be32 saddr, dscp_t dscp, struct net_device *dev); -int ip_route_use_hint(struct sk_buff *skb, __be32 daddr, __be32 saddr, - dscp_t dscp, struct net_device *dev, - const struct sk_buff *hint); +enum skb_drop_reason +ip_route_use_hint(struct sk_buff *skb, __be32 daddr, __be32 saddr, + dscp_t dscp, struct net_device *dev, + const struct sk_buff *hint); =20 static inline enum skb_drop_reason ip_route_input(struct sk_buff *skb, __be32 dst, __be32 src, dscp_t dscp, diff --git a/net/ipv4/ip_input.c b/net/ipv4/ip_input.c index 513eb0c6435a..f0a4dda246ab 100644 --- a/net/ipv4/ip_input.c +++ b/net/ipv4/ip_input.c @@ -322,15 +322,14 @@ static int ip_rcv_finish_core(struct net *net, struct= sock *sk, int err, drop_reason; struct rtable *rt; =20 - drop_reason =3D SKB_DROP_REASON_NOT_SPECIFIED; - if (ip_can_use_hint(skb, iph, hint)) { - err =3D ip_route_use_hint(skb, iph->daddr, iph->saddr, - ip4h_dscp(iph), dev, hint); - if (unlikely(err)) + drop_reason =3D ip_route_use_hint(skb, iph->daddr, iph->saddr, + ip4h_dscp(iph), dev, hint); + if (unlikely(drop_reason)) goto drop_error; } =20 + drop_reason =3D SKB_DROP_REASON_NOT_SPECIFIED; if (READ_ONCE(net->ipv4.sysctl_ip_early_demux) && !skb_dst(skb) && !skb->sk && diff --git a/net/ipv4/route.c b/net/ipv4/route.c index d47d7ae9fc61..7a064e3a2d49 100644 --- a/net/ipv4/route.c +++ b/net/ipv4/route.c @@ -2142,28 +2142,34 @@ ip_mkroute_input(struct sk_buff *skb, struct fib_re= sult *res, * assuming daddr is valid and the destination is not a local broadcast on= e. * Uses the provided hint instead of performing a route lookup. */ -int ip_route_use_hint(struct sk_buff *skb, __be32 daddr, __be32 saddr, - dscp_t dscp, struct net_device *dev, - const struct sk_buff *hint) +enum skb_drop_reason +ip_route_use_hint(struct sk_buff *skb, __be32 daddr, __be32 saddr, + dscp_t dscp, struct net_device *dev, + const struct sk_buff *hint) { + enum skb_drop_reason reason =3D SKB_DROP_REASON_NOT_SPECIFIED; struct in_device *in_dev =3D __in_dev_get_rcu(dev); struct rtable *rt =3D skb_rtable(hint); struct net *net =3D dev_net(dev); - enum skb_drop_reason reason; - int err =3D -EINVAL; u32 tag =3D 0; =20 if (!in_dev) - return -EINVAL; + return reason; =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 - 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_loopback(saddr) && !IN_DEV_NET_ROUTE_LOCALNET(in_dev, net)) + if (ipv4_is_loopback(saddr) && !IN_DEV_NET_ROUTE_LOCALNET(in_dev, net)) { + reason =3D SKB_DROP_REASON_IP_LOCALNET; goto martian_source; + } =20 if (rt->rt_type !=3D RTN_LOCAL) goto skip_validate_source; @@ -2179,7 +2185,7 @@ int ip_route_use_hint(struct sk_buff *skb, __be32 dad= dr, __be32 saddr, =20 martian_source: ip_handle_martian_source(dev, in_dev, skb, daddr, saddr); - return err; + return reason; } =20 /* get device for dst_alloc with local routes */ --=20 2.39.5