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Diffstat (limited to 'net/ipv6/udp.c')
-rw-r--r--net/ipv6/udp.c66
1 files changed, 46 insertions, 20 deletions
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index 1e586d92260..95c83479928 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -634,6 +634,10 @@ int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
if (skb->len > sizeof(struct udphdr) && encap_rcv != NULL) {
int ret;
+ /* Verify checksum before giving to encap */
+ if (udp_lib_checksum_complete(skb))
+ goto csum_error;
+
ret = encap_rcv(sk, skb);
if (ret <= 0) {
UDP_INC_STATS_BH(sock_net(sk),
@@ -701,17 +705,16 @@ static struct sock *udp_v6_mcast_next(struct net *net, struct sock *sk,
int dif)
{
struct hlist_nulls_node *node;
- struct sock *s = sk;
unsigned short num = ntohs(loc_port);
- sk_nulls_for_each_from(s, node) {
- struct inet_sock *inet = inet_sk(s);
+ sk_nulls_for_each_from(sk, node) {
+ struct inet_sock *inet = inet_sk(sk);
- if (!net_eq(sock_net(s), net))
+ if (!net_eq(sock_net(sk), net))
continue;
- if (udp_sk(s)->udp_port_hash == num &&
- s->sk_family == PF_INET6) {
+ if (udp_sk(sk)->udp_port_hash == num &&
+ sk->sk_family == PF_INET6) {
if (inet->inet_dport) {
if (inet->inet_dport != rmt_port)
continue;
@@ -720,16 +723,16 @@ static struct sock *udp_v6_mcast_next(struct net *net, struct sock *sk,
!ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr))
continue;
- if (s->sk_bound_dev_if && s->sk_bound_dev_if != dif)
+ if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif)
continue;
if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) {
if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, loc_addr))
continue;
}
- if (!inet6_mc_check(s, loc_addr, rmt_addr))
+ if (!inet6_mc_check(sk, loc_addr, rmt_addr))
continue;
- return s;
+ return sk;
}
}
return NULL;
@@ -760,6 +763,17 @@ static void flush_stack(struct sock **stack, unsigned int count,
if (unlikely(skb1))
kfree_skb(skb1);
}
+
+static void udp6_csum_zero_error(struct sk_buff *skb)
+{
+ /* RFC 2460 section 8.1 says that we SHOULD log
+ * this error. Well, it is reasonable.
+ */
+ LIMIT_NETDEBUG(KERN_INFO "IPv6: udp checksum is 0 for [%pI6c]:%u->[%pI6c]:%u\n",
+ &ipv6_hdr(skb)->saddr, ntohs(udp_hdr(skb)->source),
+ &ipv6_hdr(skb)->daddr, ntohs(udp_hdr(skb)->dest));
+}
+
/*
* Note: called only from the BH handler context,
* so we don't need to lock the hashes.
@@ -779,7 +793,12 @@ static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb,
dif = inet6_iif(skb);
sk = udp_v6_mcast_next(net, sk, uh->dest, daddr, uh->source, saddr, dif);
while (sk) {
- stack[count++] = sk;
+ /* If zero checksum and no_check is not on for
+ * the socket then skip it.
+ */
+ if (uh->check || udp_sk(sk)->no_check6_rx)
+ stack[count++] = sk;
+
sk = udp_v6_mcast_next(net, sk_nulls_next(sk), uh->dest, daddr,
uh->source, saddr, dif);
if (unlikely(count == ARRAY_SIZE(stack))) {
@@ -867,6 +886,12 @@ int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
if (sk != NULL) {
int ret;
+ if (!uh->check && !udp_sk(sk)->no_check6_rx) {
+ sock_put(sk);
+ udp6_csum_zero_error(skb);
+ goto csum_error;
+ }
+
ret = udpv6_queue_rcv_skb(sk, skb);
sock_put(sk);
@@ -879,6 +904,11 @@ int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
return 0;
}
+ if (!uh->check) {
+ udp6_csum_zero_error(skb);
+ goto csum_error;
+ }
+
if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
goto discard;
@@ -1006,7 +1036,10 @@ static int udp_v6_push_pending_frames(struct sock *sk)
if (is_udplite)
csum = udplite_csum_outgoing(sk, skb);
- else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */
+ else if (up->no_check6_tx) { /* UDP csum disabled */
+ skb->ip_summed = CHECKSUM_NONE;
+ goto send;
+ } else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */
udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr,
up->len);
goto send;
@@ -1232,14 +1265,8 @@ do_udp_sendmsg:
goto out;
}
- if (hlimit < 0) {
- if (ipv6_addr_is_multicast(&fl6.daddr))
- hlimit = np->mcast_hops;
- else
- hlimit = np->hop_limit;
- if (hlimit < 0)
- hlimit = ip6_dst_hoplimit(dst);
- }
+ if (hlimit < 0)
+ hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst);
if (tclass < 0)
tclass = np->tclass;
@@ -1479,7 +1506,6 @@ static struct inet_protosw udpv6_protosw = {
.protocol = IPPROTO_UDP,
.prot = &udpv6_prot,
.ops = &inet6_dgram_ops,
- .no_check = UDP_CSUM_DEFAULT,
.flags = INET_PROTOSW_PERMANENT,
};