提交 5fa12739 编写于 作者: E Edward Cree 提交者: David S. Miller

net: ipv4: listify ip_rcv_finish

ip_rcv_finish_core(), if it does not drop, sets skb->dst by either early
 demux or route lookup.  The last step, calling dst_input(skb), is left to
 the caller; in the listified case, we split to form sublists with a common
 dst, but then ip_sublist_rcv_finish() just calls dst_input(skb) in a loop.
The next step in listification would thus be to add a list_input() method
 to struct dst_entry.

Early demux is an indirect call based on iph->protocol; this is another
 opportunity for listification which is not taken here (it would require
 slicing up ip_rcv_finish_core() to allow splitting on protocol changes).
Signed-off-by: NEdward Cree <ecree@solarflare.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
上级 17266ee9
...@@ -307,7 +307,8 @@ static inline bool ip_rcv_options(struct sk_buff *skb) ...@@ -307,7 +307,8 @@ static inline bool ip_rcv_options(struct sk_buff *skb)
return true; return true;
} }
static int ip_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb) static int ip_rcv_finish_core(struct net *net, struct sock *sk,
struct sk_buff *skb)
{ {
const struct iphdr *iph = ip_hdr(skb); const struct iphdr *iph = ip_hdr(skb);
int (*edemux)(struct sk_buff *skb); int (*edemux)(struct sk_buff *skb);
...@@ -393,7 +394,7 @@ static int ip_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb) ...@@ -393,7 +394,7 @@ static int ip_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb)
goto drop; goto drop;
} }
return dst_input(skb); return NET_RX_SUCCESS;
drop: drop:
kfree_skb(skb); kfree_skb(skb);
...@@ -405,6 +406,15 @@ static int ip_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb) ...@@ -405,6 +406,15 @@ static int ip_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb)
goto drop; goto drop;
} }
static int ip_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb)
{
int ret = ip_rcv_finish_core(net, sk, skb);
if (ret != NET_RX_DROP)
ret = dst_input(skb);
return ret;
}
/* /*
* Main IP Receive routine. * Main IP Receive routine.
*/ */
...@@ -515,15 +525,47 @@ int ip_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, ...@@ -515,15 +525,47 @@ int ip_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt,
ip_rcv_finish); ip_rcv_finish);
} }
static void ip_sublist_rcv(struct list_head *head, struct net_device *dev, static void ip_sublist_rcv_finish(struct list_head *head)
struct net *net)
{ {
struct sk_buff *skb, *next; struct sk_buff *skb, *next;
list_for_each_entry_safe(skb, next, head, list)
dst_input(skb);
}
static void ip_list_rcv_finish(struct net *net, struct sock *sk,
struct list_head *head)
{
struct dst_entry *curr_dst = NULL;
struct sk_buff *skb, *next;
struct list_head sublist;
list_for_each_entry_safe(skb, next, head, list) {
struct dst_entry *dst;
if (ip_rcv_finish_core(net, sk, skb) == NET_RX_DROP)
continue;
dst = skb_dst(skb);
if (curr_dst != dst) {
/* dispatch old sublist */
list_cut_before(&sublist, head, &skb->list);
if (!list_empty(&sublist))
ip_sublist_rcv_finish(&sublist);
/* start new sublist */
curr_dst = dst;
}
}
/* dispatch final sublist */
ip_sublist_rcv_finish(head);
}
static void ip_sublist_rcv(struct list_head *head, struct net_device *dev,
struct net *net)
{
NF_HOOK_LIST(NFPROTO_IPV4, NF_INET_PRE_ROUTING, net, NULL, NF_HOOK_LIST(NFPROTO_IPV4, NF_INET_PRE_ROUTING, net, NULL,
head, dev, NULL, ip_rcv_finish); head, dev, NULL, ip_rcv_finish);
list_for_each_entry_safe(skb, next, head, list) ip_list_rcv_finish(net, NULL, head);
ip_rcv_finish(net, NULL, skb);
} }
/* Receive a list of IP packets */ /* Receive a list of IP packets */
......
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