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Message-ID: <201704270759.QTwxqqhI%fengguang.wu@intel.com>
Date: Thu, 27 Apr 2017 07:41:05 +0800
From: kbuild test robot <lkp@...el.com>
To: Donatas Abraitis <donatas.abraitis@...il.com>
Cc: kbuild-all@...org, davem@...emloft.net, netdev@...r.kernel.org,
stable@...r.kernel.org, donatas.abraitis@...il.com
Subject: Re: [PATCH net-next v1] net: ipv6: make sure multicast packets are
not forwarded beyond the different scopes
Hi Donatas,
[auto build test ERROR on net-next/master]
url: https://github.com/0day-ci/linux/commits/Donatas-Abraitis/net-ipv6-make-sure-multicast-packets-are-not-forwarded-beyond-the-different-scopes/20170426-180846
config: x86_64-rhel (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
# save the attached .config to linux build tree
make ARCH=x86_64
All errors (new ones prefixed by >>):
net//ipv6/ip6_input.c: In function 'ipv6_rcv':
>> net//ipv6/ip6_input.c:174:10: error: expected ')' before 'goto'
goto err;
^~~~
>> net//ipv6/ip6_input.c:225:1: error: expected expression before '}' token
}
^
>> net//ipv6/ip6_input.c:166:3: error: label 'err' used but not defined
goto err;
^~~~
>> net//ipv6/ip6_input.c:95:3: error: label 'drop' used but not defined
goto drop;
^~~~
net//ipv6/ip6_input.c:77:6: warning: unused variable 'pkt_len' [-Wunused-variable]
u32 pkt_len;
^~~~~~~
net//ipv6/ip6_input.c:225:1: warning: control reaches end of non-void function [-Wreturn-type]
}
^
vim +174 net//ipv6/ip6_input.c
89
90 __IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_IN, skb->len);
91
92 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL ||
93 !idev || unlikely(idev->cnf.disable_ipv6)) {
94 __IP6_INC_STATS(net, idev, IPSTATS_MIB_INDISCARDS);
> 95 goto drop;
96 }
97
98 memset(IP6CB(skb), 0, sizeof(struct inet6_skb_parm));
99
100 /*
101 * Store incoming device index. When the packet will
102 * be queued, we cannot refer to skb->dev anymore.
103 *
104 * BTW, when we send a packet for our own local address on a
105 * non-loopback interface (e.g. ethX), it is being delivered
106 * via the loopback interface (lo) here; skb->dev = loopback_dev.
107 * It, however, should be considered as if it is being
108 * arrived via the sending interface (ethX), because of the
109 * nature of scoping architecture. --yoshfuji
110 */
111 IP6CB(skb)->iif = skb_valid_dst(skb) ? ip6_dst_idev(skb_dst(skb))->dev->ifindex : dev->ifindex;
112
113 if (unlikely(!pskb_may_pull(skb, sizeof(*hdr))))
114 goto err;
115
116 hdr = ipv6_hdr(skb);
117
118 if (hdr->version != 6)
119 goto err;
120
121 __IP6_ADD_STATS(net, idev,
122 IPSTATS_MIB_NOECTPKTS +
123 (ipv6_get_dsfield(hdr) & INET_ECN_MASK),
124 max_t(unsigned short, 1, skb_shinfo(skb)->gso_segs));
125 /*
126 * RFC4291 2.5.3
127 * The loopback address must not be used as the source address in IPv6
128 * packets that are sent outside of a single node. [..]
129 * A packet received on an interface with a destination address
130 * of loopback must be dropped.
131 */
132 if ((ipv6_addr_loopback(&hdr->saddr) ||
133 ipv6_addr_loopback(&hdr->daddr)) &&
134 !(dev->flags & IFF_LOOPBACK))
135 goto err;
136
137 /* RFC4291 Errata ID: 3480
138 * Interface-Local scope spans only a single interface on a
139 * node and is useful only for loopback transmission of
140 * multicast. Packets with interface-local scope received
141 * from another node must be discarded.
142 */
143 if (!(skb->pkt_type == PACKET_LOOPBACK ||
144 dev->flags & IFF_LOOPBACK) &&
145 ipv6_addr_is_multicast(&hdr->daddr) &&
146 IPV6_ADDR_MC_SCOPE(&hdr->daddr) == 1)
147 goto err;
148
149 /* If enabled, drop unicast packets that were encapsulated in link-layer
150 * multicast or broadcast to protected against the so-called "hole-196"
151 * attack in 802.11 wireless.
152 */
153 if (!ipv6_addr_is_multicast(&hdr->daddr) &&
154 (skb->pkt_type == PACKET_BROADCAST ||
155 skb->pkt_type == PACKET_MULTICAST) &&
156 idev->cnf.drop_unicast_in_l2_multicast)
157 goto err;
158
159 /* RFC4291 2.7
160 * Nodes must not originate a packet to a multicast address whose scope
161 * field contains the reserved value 0; if such a packet is received, it
162 * must be silently dropped.
163 */
164 if (ipv6_addr_is_multicast(&hdr->daddr) &&
165 IPV6_ADDR_MC_SCOPE(&hdr->daddr) == 0)
> 166 goto err;
167
168 /* RFC4291 2.7
169 * Routers must not forward any multicast packets beyond of the scope
170 * indicated by the scop field in the destination multicast address.
171 */
172 if (ipv6_addr_is_multicast(&hdr->daddr) &&
173 IPV6_ADDR_MC_SCOPE(&hdr->daddr) != IPV6_ADDR_MC_SCOPE(&hdr->saddr)
> 174 goto err;
175
176 /*
177 * RFC4291 2.7
178 * Multicast addresses must not be used as source addresses in IPv6
179 * packets or appear in any Routing header.
180 */
181 if (ipv6_addr_is_multicast(&hdr->saddr))
182 goto err;
183
184 skb->transport_header = skb->network_header + sizeof(*hdr);
185 IP6CB(skb)->nhoff = offsetof(struct ipv6hdr, nexthdr);
186
187 pkt_len = ntohs(hdr->payload_len);
188
189 /* pkt_len may be zero if Jumbo payload option is present */
190 if (pkt_len || hdr->nexthdr != NEXTHDR_HOP) {
191 if (pkt_len + sizeof(struct ipv6hdr) > skb->len) {
192 __IP6_INC_STATS(net,
193 idev, IPSTATS_MIB_INTRUNCATEDPKTS);
194 goto drop;
195 }
196 if (pskb_trim_rcsum(skb, pkt_len + sizeof(struct ipv6hdr))) {
197 __IP6_INC_STATS(net, idev, IPSTATS_MIB_INHDRERRORS);
198 goto drop;
199 }
200 hdr = ipv6_hdr(skb);
201 }
202
203 if (hdr->nexthdr == NEXTHDR_HOP) {
204 if (ipv6_parse_hopopts(skb) < 0) {
205 __IP6_INC_STATS(net, idev, IPSTATS_MIB_INHDRERRORS);
206 rcu_read_unlock();
207 return NET_RX_DROP;
208 }
209 }
210
211 rcu_read_unlock();
212
213 /* Must drop socket now because of tproxy. */
214 skb_orphan(skb);
215
216 return NF_HOOK(NFPROTO_IPV6, NF_INET_PRE_ROUTING,
217 net, NULL, skb, dev, NULL,
218 ip6_rcv_finish);
219 err:
220 __IP6_INC_STATS(net, idev, IPSTATS_MIB_INHDRERRORS);
221 drop:
222 rcu_read_unlock();
223 kfree_skb(skb);
224 return NET_RX_DROP;
> 225 }
226
227 /*
228 * Deliver the packet to the host
---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all Intel Corporation
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