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-rw-r--r--net/core/dev.c84
1 files changed, 74 insertions, 10 deletions
diff --git a/net/core/dev.c b/net/core/dev.c
index 0ebaea16632..83988362805 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -1055,6 +1055,8 @@ rollback:
*/
int dev_set_alias(struct net_device *dev, const char *alias, size_t len)
{
+ char *new_ifalias;
+
ASSERT_RTNL();
if (len >= IFALIASZ)
@@ -1068,9 +1070,10 @@ int dev_set_alias(struct net_device *dev, const char *alias, size_t len)
return 0;
}
- dev->ifalias = krealloc(dev->ifalias, len + 1, GFP_KERNEL);
- if (!dev->ifalias)
+ new_ifalias = krealloc(dev->ifalias, len + 1, GFP_KERNEL);
+ if (!new_ifalias)
return -ENOMEM;
+ dev->ifalias = new_ifalias;
strlcpy(dev->ifalias, alias, len+1);
return len;
@@ -1172,6 +1175,7 @@ static int __dev_open(struct net_device *dev)
net_dmaengine_get();
dev_set_rx_mode(dev);
dev_activate(dev);
+ add_device_randomness(dev->dev_addr, dev->addr_len);
}
return ret;
@@ -1638,6 +1642,19 @@ static inline int deliver_skb(struct sk_buff *skb,
return pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
}
+static inline bool skb_loop_sk(struct packet_type *ptype, struct sk_buff *skb)
+{
+ if (ptype->af_packet_priv == NULL)
+ return false;
+
+ if (ptype->id_match)
+ return ptype->id_match(ptype, skb->sk);
+ else if ((struct sock *)ptype->af_packet_priv == skb->sk)
+ return true;
+
+ return false;
+}
+
/*
* Support routine. Sends outgoing frames to any network
* taps currently in use.
@@ -1655,8 +1672,7 @@ static void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev)
* they originated from - MvS (miquels@drinkel.ow.org)
*/
if ((ptype->dev == dev || !ptype->dev) &&
- (ptype->af_packet_priv == NULL ||
- (struct sock *)ptype->af_packet_priv != skb->sk)) {
+ (!skb_loop_sk(ptype, skb))) {
if (pt_prev) {
deliver_skb(skb2, pt_prev, skb->dev);
pt_prev = ptype;
@@ -2133,6 +2149,9 @@ netdev_features_t netif_skb_features(struct sk_buff *skb)
__be16 protocol = skb->protocol;
netdev_features_t features = skb->dev->features;
+ if (skb_shinfo(skb)->gso_segs > skb->dev->gso_max_segs)
+ features &= ~NETIF_F_GSO_MASK;
+
if (protocol == htons(ETH_P_8021Q)) {
struct vlan_ethhdr *veh = (struct vlan_ethhdr *)skb->data;
protocol = veh->h_vlan_encapsulated_proto;
@@ -3155,6 +3174,23 @@ void netdev_rx_handler_unregister(struct net_device *dev)
}
EXPORT_SYMBOL_GPL(netdev_rx_handler_unregister);
+/*
+ * Limit the use of PFMEMALLOC reserves to those protocols that implement
+ * the special handling of PFMEMALLOC skbs.
+ */
+static bool skb_pfmemalloc_protocol(struct sk_buff *skb)
+{
+ switch (skb->protocol) {
+ case __constant_htons(ETH_P_ARP):
+ case __constant_htons(ETH_P_IP):
+ case __constant_htons(ETH_P_IPV6):
+ case __constant_htons(ETH_P_8021Q):
+ return true;
+ default:
+ return false;
+ }
+}
+
static int __netif_receive_skb(struct sk_buff *skb)
{
struct packet_type *ptype, *pt_prev;
@@ -3164,14 +3200,27 @@ static int __netif_receive_skb(struct sk_buff *skb)
bool deliver_exact = false;
int ret = NET_RX_DROP;
__be16 type;
+ unsigned long pflags = current->flags;
net_timestamp_check(!netdev_tstamp_prequeue, skb);
trace_netif_receive_skb(skb);
+ /*
+ * PFMEMALLOC skbs are special, they should
+ * - be delivered to SOCK_MEMALLOC sockets only
+ * - stay away from userspace
+ * - have bounded memory usage
+ *
+ * Use PF_MEMALLOC as this saves us from propagating the allocation
+ * context down to all allocation sites.
+ */
+ if (sk_memalloc_socks() && skb_pfmemalloc(skb))
+ current->flags |= PF_MEMALLOC;
+
/* if we've gotten here through NAPI, check netpoll */
if (netpoll_receive_skb(skb))
- return NET_RX_DROP;
+ goto out;
orig_dev = skb->dev;
@@ -3191,7 +3240,7 @@ another_round:
if (skb->protocol == cpu_to_be16(ETH_P_8021Q)) {
skb = vlan_untag(skb);
if (unlikely(!skb))
- goto out;
+ goto unlock;
}
#ifdef CONFIG_NET_CLS_ACT
@@ -3201,6 +3250,9 @@ another_round:
}
#endif
+ if (sk_memalloc_socks() && skb_pfmemalloc(skb))
+ goto skip_taps;
+
list_for_each_entry_rcu(ptype, &ptype_all, list) {
if (!ptype->dev || ptype->dev == skb->dev) {
if (pt_prev)
@@ -3209,13 +3261,18 @@ another_round:
}
}
+skip_taps:
#ifdef CONFIG_NET_CLS_ACT
skb = handle_ing(skb, &pt_prev, &ret, orig_dev);
if (!skb)
- goto out;
+ goto unlock;
ncls:
#endif
+ if (sk_memalloc_socks() && skb_pfmemalloc(skb)
+ && !skb_pfmemalloc_protocol(skb))
+ goto drop;
+
rx_handler = rcu_dereference(skb->dev->rx_handler);
if (vlan_tx_tag_present(skb)) {
if (pt_prev) {
@@ -3225,7 +3282,7 @@ ncls:
if (vlan_do_receive(&skb, !rx_handler))
goto another_round;
else if (unlikely(!skb))
- goto out;
+ goto unlock;
}
if (rx_handler) {
@@ -3235,7 +3292,7 @@ ncls:
}
switch (rx_handler(&skb)) {
case RX_HANDLER_CONSUMED:
- goto out;
+ goto unlock;
case RX_HANDLER_ANOTHER:
goto another_round;
case RX_HANDLER_EXACT:
@@ -3268,6 +3325,7 @@ ncls:
else
ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
} else {
+drop:
atomic_long_inc(&skb->dev->rx_dropped);
kfree_skb(skb);
/* Jamal, now you will not able to escape explaining
@@ -3276,8 +3334,10 @@ ncls:
ret = NET_RX_DROP;
}
-out:
+unlock:
rcu_read_unlock();
+out:
+ tsk_restore_flags(current, pflags, PF_MEMALLOC);
return ret;
}
@@ -4801,6 +4861,7 @@ int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa)
err = ops->ndo_set_mac_address(dev, sa);
if (!err)
call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
+ add_device_randomness(dev->dev_addr, dev->addr_len);
return err;
}
EXPORT_SYMBOL(dev_set_mac_address);
@@ -5579,6 +5640,7 @@ int register_netdevice(struct net_device *dev)
dev_init_scheduler(dev);
dev_hold(dev);
list_netdevice(dev);
+ add_device_randomness(dev->dev_addr, dev->addr_len);
/* Notify protocols, that a new device appeared. */
ret = call_netdevice_notifiers(NETDEV_REGISTER, dev);
@@ -5682,6 +5744,7 @@ EXPORT_SYMBOL(netdev_refcnt_read);
/**
* netdev_wait_allrefs - wait until all references are gone.
+ * @dev: target net_device
*
* This is called when unregistering network devices.
*
@@ -5942,6 +6005,7 @@ struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name,
dev_net_set(dev, &init_net);
dev->gso_max_size = GSO_MAX_SIZE;
+ dev->gso_max_segs = GSO_MAX_SEGS;
INIT_LIST_HEAD(&dev->napi_list);
INIT_LIST_HEAD(&dev->unreg_list);
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-03-31 22:49:02 +0000