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ipv4: Pass explicit daddr arg to ip_send_reply().

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This eliminates an access to rt->rt_src.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2011-05-09 13:22:43 -07:00
commit 0a5ebb8000
3 changed files with 7 additions and 8 deletions
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4
include/net/ip.h
View file

@ -174,8 +174,8 @@ static inline __u8 ip_reply_arg_flowi_flags(const struct ip_reply_arg *arg)
return (arg->flags & IP_REPLY_ARG_NOSRCCHECK) ? FLOWI_FLAG_ANYSRC : 0;
}
void ip_send_reply(struct sock *sk, struct sk_buff *skb, struct ip_reply_arg *arg,
unsigned int len);
void ip_send_reply(struct sock *sk, struct sk_buff *skb, __be32 daddr,
struct ip_reply_arg *arg, unsigned int len);
struct ipv4_config {
int log_martians;

7
net/ipv4/ip_output.c
View file

@ -1459,20 +1459,19 @@ static int ip_reply_glue_bits(void *dptr, char *to, int offset,
* Should run single threaded per socket because it uses the sock
* structure to pass arguments.
*/
void ip_send_reply(struct sock *sk, struct sk_buff *skb, struct ip_reply_arg *arg,
unsigned int len)
void ip_send_reply(struct sock *sk, struct sk_buff *skb, __be32 daddr,
struct ip_reply_arg *arg, unsigned int len)
{
struct inet_sock *inet = inet_sk(sk);
struct ip_options_data replyopts;
struct ipcm_cookie ipc;
struct flowi4 fl4;
__be32 daddr;
struct rtable *rt = skb_rtable(skb);
if (ip_options_echo(&replyopts.opt.opt, skb))
return;
daddr = ipc.addr = rt->rt_src;
ipc.addr = daddr;
ipc.opt = NULL;
ipc.tx_flags = 0;

4
net/ipv4/tcp_ipv4.c
View file

@ -651,7 +651,7 @@ static void tcp_v4_send_reset(struct sock *sk, struct sk_buff *skb)
arg.flags = (sk && inet_sk(sk)->transparent) ? IP_REPLY_ARG_NOSRCCHECK : 0;
net = dev_net(skb_dst(skb)->dev);
ip_send_reply(net->ipv4.tcp_sock, skb,
ip_send_reply(net->ipv4.tcp_sock, skb, ip_hdr(skb)->saddr,
&arg, arg.iov[0].iov_len);
TCP_INC_STATS_BH(net, TCP_MIB_OUTSEGS);
@ -726,7 +726,7 @@ static void tcp_v4_send_ack(struct sk_buff *skb, u32 seq, u32 ack,
if (oif)
arg.bound_dev_if = oif;
ip_send_reply(net->ipv4.tcp_sock, skb,
ip_send_reply(net->ipv4.tcp_sock, skb, ip_hdr(skb)->saddr,
&arg, arg.iov[0].iov_len);
TCP_INC_STATS_BH(net, TCP_MIB_OUTSEGS);