aboutsummaryrefslogtreecommitdiffstats
path: root/net/ipv4
diff options
context:
space:
mode:
Diffstat (limited to 'net/ipv4')
-rw-r--r--net/ipv4/inetpeer.c4
-rw-r--r--net/ipv4/ip_gre.c12
-rw-r--r--net/ipv4/ip_input.c25
-rw-r--r--net/ipv4/ip_vti.c3
-rw-r--r--net/ipv4/route.c46
-rw-r--r--net/ipv4/tcp_ipv4.c9
-rw-r--r--net/ipv4/udp.c24
7 files changed, 75 insertions, 48 deletions
diff --git a/net/ipv4/inetpeer.c b/net/ipv4/inetpeer.c
index 6e5626cc366c..914d56928578 100644
--- a/net/ipv4/inetpeer.c
+++ b/net/ipv4/inetpeer.c
@@ -128,9 +128,9 @@ static struct inet_peer *lookup(const struct inetpeer_addr *daddr,
break;
}
if (cmp == -1)
- pp = &(*pp)->rb_left;
+ pp = &next->rb_left;
else
- pp = &(*pp)->rb_right;
+ pp = &next->rb_right;
}
*parent_p = parent;
*pp_p = pp;
diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c
index 9cee986ac6b8..dc2317776499 100644
--- a/net/ipv4/ip_gre.c
+++ b/net/ipv4/ip_gre.c
@@ -259,7 +259,6 @@ static int erspan_rcv(struct sk_buff *skb, struct tnl_ptk_info *tpi,
struct ip_tunnel *tunnel;
struct erspanhdr *ershdr;
const struct iphdr *iph;
- __be32 session_id;
__be32 index;
int len;
@@ -275,8 +274,7 @@ static int erspan_rcv(struct sk_buff *skb, struct tnl_ptk_info *tpi,
/* The original GRE header does not have key field,
* Use ERSPAN 10-bit session ID as key.
*/
- session_id = cpu_to_be32(ntohs(ershdr->session_id));
- tpi->key = session_id;
+ tpi->key = cpu_to_be32(ntohs(ershdr->session_id) & ID_MASK);
index = ershdr->md.index;
tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex,
tpi->flags | TUNNEL_KEY,
@@ -733,7 +731,7 @@ static netdev_tx_t erspan_xmit(struct sk_buff *skb,
if (skb_cow_head(skb, dev->needed_headroom))
goto free_skb;
- if (skb->len > dev->mtu) {
+ if (skb->len - dev->hard_header_len > dev->mtu) {
pskb_trim(skb, dev->mtu);
truncate = true;
}
@@ -1222,6 +1220,7 @@ static int gre_tap_init(struct net_device *dev)
{
__gre_tunnel_init(dev);
dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
+ netif_keep_dst(dev);
return ip_tunnel_init(dev);
}
@@ -1245,13 +1244,16 @@ static int erspan_tunnel_init(struct net_device *dev)
tunnel->tun_hlen = 8;
tunnel->parms.iph.protocol = IPPROTO_GRE;
- t_hlen = tunnel->hlen + sizeof(struct iphdr) + sizeof(struct erspanhdr);
+ tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen +
+ sizeof(struct erspanhdr);
+ t_hlen = tunnel->hlen + sizeof(struct iphdr);
dev->needed_headroom = LL_MAX_HEADER + t_hlen + 4;
dev->mtu = ETH_DATA_LEN - t_hlen - 4;
dev->features |= GRE_FEATURES;
dev->hw_features |= GRE_FEATURES;
dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
+ netif_keep_dst(dev);
return ip_tunnel_init(dev);
}
diff --git a/net/ipv4/ip_input.c b/net/ipv4/ip_input.c
index fa2dc8f692c6..57fc13c6ab2b 100644
--- a/net/ipv4/ip_input.c
+++ b/net/ipv4/ip_input.c
@@ -311,9 +311,10 @@ drop:
static int ip_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb)
{
const struct iphdr *iph = ip_hdr(skb);
- struct rtable *rt;
+ int (*edemux)(struct sk_buff *skb);
struct net_device *dev = skb->dev;
- void (*edemux)(struct sk_buff *skb);
+ struct rtable *rt;
+ int err;
/* if ingress device is enslaved to an L3 master device pass the
* skb to its handler for processing
@@ -331,7 +332,9 @@ static int ip_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb)
ipprot = rcu_dereference(inet_protos[protocol]);
if (ipprot && (edemux = READ_ONCE(ipprot->early_demux))) {
- edemux(skb);
+ err = edemux(skb);
+ if (unlikely(err))
+ goto drop_error;
/* must reload iph, skb->head might have changed */
iph = ip_hdr(skb);
}
@@ -342,13 +345,10 @@ static int ip_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb)
* how the packet travels inside Linux networking.
*/
if (!skb_valid_dst(skb)) {
- int err = ip_route_input_noref(skb, iph->daddr, iph->saddr,
- iph->tos, dev);
- if (unlikely(err)) {
- if (err == -EXDEV)
- __NET_INC_STATS(net, LINUX_MIB_IPRPFILTER);
- goto drop;
- }
+ err = ip_route_input_noref(skb, iph->daddr, iph->saddr,
+ iph->tos, dev);
+ if (unlikely(err))
+ goto drop_error;
}
#ifdef CONFIG_IP_ROUTE_CLASSID
@@ -399,6 +399,11 @@ static int ip_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb)
drop:
kfree_skb(skb);
return NET_RX_DROP;
+
+drop_error:
+ if (err == -EXDEV)
+ __NET_INC_STATS(net, LINUX_MIB_IPRPFILTER);
+ goto drop;
}
/*
diff --git a/net/ipv4/ip_vti.c b/net/ipv4/ip_vti.c
index 02d70ca99db1..58465c0a8682 100644
--- a/net/ipv4/ip_vti.c
+++ b/net/ipv4/ip_vti.c
@@ -168,6 +168,7 @@ static netdev_tx_t vti_xmit(struct sk_buff *skb, struct net_device *dev,
struct ip_tunnel_parm *parms = &tunnel->parms;
struct dst_entry *dst = skb_dst(skb);
struct net_device *tdev; /* Device to other host */
+ int pkt_len = skb->len;
int err;
int mtu;
@@ -229,7 +230,7 @@ static netdev_tx_t vti_xmit(struct sk_buff *skb, struct net_device *dev,
err = dst_output(tunnel->net, skb->sk, skb);
if (net_xmit_eval(err) == 0)
- err = skb->len;
+ err = pkt_len;
iptunnel_xmit_stats(dev, err);
return NETDEV_TX_OK;
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 94d4cd2d5ea4..ac6fde5d45f1 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -1520,43 +1520,56 @@ struct rtable *rt_dst_alloc(struct net_device *dev,
EXPORT_SYMBOL(rt_dst_alloc);
/* called in rcu_read_lock() section */
-static int ip_route_input_mc(struct sk_buff *skb, __be32 daddr, __be32 saddr,
- u8 tos, struct net_device *dev, int our)
+int ip_mc_validate_source(struct sk_buff *skb, __be32 daddr, __be32 saddr,
+ u8 tos, struct net_device *dev,
+ struct in_device *in_dev, u32 *itag)
{
- struct rtable *rth;
- struct in_device *in_dev = __in_dev_get_rcu(dev);
- unsigned int flags = RTCF_MULTICAST;
- u32 itag = 0;
int err;
/* Primary sanity checks. */
-
if (!in_dev)
return -EINVAL;
if (ipv4_is_multicast(saddr) || ipv4_is_lbcast(saddr) ||
skb->protocol != htons(ETH_P_IP))
- goto e_inval;
+ return -EINVAL;
if (ipv4_is_loopback(saddr) && !IN_DEV_ROUTE_LOCALNET(in_dev))
- goto e_inval;
+ return -EINVAL;
if (ipv4_is_zeronet(saddr)) {
if (!ipv4_is_local_multicast(daddr))
- goto e_inval;
+ return -EINVAL;
} else {
err = fib_validate_source(skb, saddr, 0, tos, 0, dev,
- in_dev, &itag);
+ in_dev, itag);
if (err < 0)
- goto e_err;
+ return err;
}
+ return 0;
+}
+
+/* called in rcu_read_lock() section */
+static int ip_route_input_mc(struct sk_buff *skb, __be32 daddr, __be32 saddr,
+ u8 tos, struct net_device *dev, int our)
+{
+ struct in_device *in_dev = __in_dev_get_rcu(dev);
+ unsigned int flags = RTCF_MULTICAST;
+ struct rtable *rth;
+ u32 itag = 0;
+ int err;
+
+ err = ip_mc_validate_source(skb, daddr, saddr, tos, dev, in_dev, &itag);
+ if (err)
+ return err;
+
if (our)
flags |= RTCF_LOCAL;
rth = rt_dst_alloc(dev_net(dev)->loopback_dev, flags, RTN_MULTICAST,
IN_DEV_CONF_GET(in_dev, NOPOLICY), false, false);
if (!rth)
- goto e_nobufs;
+ return -ENOBUFS;
#ifdef CONFIG_IP_ROUTE_CLASSID
rth->dst.tclassid = itag;
@@ -1572,13 +1585,6 @@ static int ip_route_input_mc(struct sk_buff *skb, __be32 daddr, __be32 saddr,
skb_dst_set(skb, &rth->dst);
return 0;
-
-e_nobufs:
- return -ENOBUFS;
-e_inval:
- return -EINVAL;
-e_err:
- return err;
}
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index ad3b5bbaf942..c7460fd90884 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -1503,23 +1503,23 @@ csum_err:
}
EXPORT_SYMBOL(tcp_v4_do_rcv);
-void tcp_v4_early_demux(struct sk_buff *skb)
+int tcp_v4_early_demux(struct sk_buff *skb)
{
const struct iphdr *iph;
const struct tcphdr *th;
struct sock *sk;
if (skb->pkt_type != PACKET_HOST)
- return;
+ return 0;
if (!pskb_may_pull(skb, skb_transport_offset(skb) + sizeof(struct tcphdr)))
- return;
+ return 0;
iph = ip_hdr(skb);
th = tcp_hdr(skb);
if (th->doff < sizeof(struct tcphdr) / 4)
- return;
+ return 0;
sk = __inet_lookup_established(dev_net(skb->dev), &tcp_hashinfo,
iph->saddr, th->source,
@@ -1538,6 +1538,7 @@ void tcp_v4_early_demux(struct sk_buff *skb)
skb_dst_set_noref(skb, dst);
}
}
+ return 0;
}
bool tcp_add_backlog(struct sock *sk, struct sk_buff *skb)
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index 784ced0b9150..eb0359bdaa11 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -2220,9 +2220,10 @@ static struct sock *__udp4_lib_demux_lookup(struct net *net,
return NULL;
}
-void udp_v4_early_demux(struct sk_buff *skb)
+int udp_v4_early_demux(struct sk_buff *skb)
{
struct net *net = dev_net(skb->dev);
+ struct in_device *in_dev = NULL;
const struct iphdr *iph;
const struct udphdr *uh;
struct sock *sk = NULL;
@@ -2233,24 +2234,24 @@ void udp_v4_early_demux(struct sk_buff *skb)
/* validate the packet */
if (!pskb_may_pull(skb, skb_transport_offset(skb) + sizeof(struct udphdr)))
- return;
+ return 0;
iph = ip_hdr(skb);
uh = udp_hdr(skb);
if (skb->pkt_type == PACKET_BROADCAST ||
skb->pkt_type == PACKET_MULTICAST) {
- struct in_device *in_dev = __in_dev_get_rcu(skb->dev);
+ in_dev = __in_dev_get_rcu(skb->dev);
if (!in_dev)
- return;
+ return 0;
/* we are supposed to accept bcast packets */
if (skb->pkt_type == PACKET_MULTICAST) {
ours = ip_check_mc_rcu(in_dev, iph->daddr, iph->saddr,
iph->protocol);
if (!ours)
- return;
+ return 0;
}
sk = __udp4_lib_mcast_demux_lookup(net, uh->dest, iph->daddr,
@@ -2262,7 +2263,7 @@ void udp_v4_early_demux(struct sk_buff *skb)
}
if (!sk || !refcount_inc_not_zero(&sk->sk_refcnt))
- return;
+ return 0;
skb->sk = sk;
skb->destructor = sock_efree;
@@ -2271,12 +2272,23 @@ void udp_v4_early_demux(struct sk_buff *skb)
if (dst)
dst = dst_check(dst, 0);
if (dst) {
+ u32 itag = 0;
+
/* set noref for now.
* any place which wants to hold dst has to call
* dst_hold_safe()
*/
skb_dst_set_noref(skb, dst);
+
+ /* for unconnected multicast sockets we need to validate
+ * the source on each packet
+ */
+ if (!inet_sk(sk)->inet_daddr && in_dev)
+ return ip_mc_validate_source(skb, iph->daddr,
+ iph->saddr, iph->tos,
+ skb->dev, in_dev, &itag);
}
+ return 0;
}
int udp_rcv(struct sk_buff *skb)
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.