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ipv4: Pass flow keys down into datagram packet building engine.

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This way ip_output.c no longer needs rt->rt_{src,dst}.

We already have these keys sitting, ready and waiting, on the stack or
in a socket structure.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller
2011-05-08 17:12:19 -07:00
parent e474995f29
commit 77968b7824
5 changed files with 91 additions and 93 deletions
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39
net/ipv4/ip_output.c
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@@ -1267,6 +1267,7 @@ static void ip_cork_release(struct inet_cork *cork)
* and push them out.
*/
struct sk_buff *__ip_make_skb(struct sock *sk,
struct flowi4 *fl4,
struct sk_buff_head *queue,
struct inet_cork *cork)
{
@@ -1333,8 +1334,8 @@ struct sk_buff *__ip_make_skb(struct sock *sk,
ip_select_ident(iph, &rt->dst, sk);
iph->ttl = ttl;
iph->protocol = sk->sk_protocol;
iph->saddr = rt->rt_src;
iph->daddr = rt->rt_dst;
iph->saddr = fl4->saddr;
iph->daddr = fl4->daddr;
skb->priority = sk->sk_priority;
skb->mark = sk->sk_mark;
@@ -1370,11 +1371,11 @@ int ip_send_skb(struct sk_buff *skb)
return err;
}
int ip_push_pending_frames(struct sock *sk)
int ip_push_pending_frames(struct sock *sk, struct flowi4 *fl4)
{
struct sk_buff *skb;
skb = ip_finish_skb(sk);
skb = ip_finish_skb(sk, fl4);
if (!skb)
return 0;
@@ -1403,6 +1404,7 @@ void ip_flush_pending_frames(struct sock *sk)
}
struct sk_buff *ip_make_skb(struct sock *sk,
struct flowi4 *fl4,
int getfrag(void *from, char *to, int offset,
int len, int odd, struct sk_buff *skb),
void *from, int length, int transhdrlen,
@@ -1432,7 +1434,7 @@ struct sk_buff *ip_make_skb(struct sock *sk,
return ERR_PTR(err);
}
return __ip_make_skb(sk, &queue, &cork);
return __ip_make_skb(sk, fl4, &queue, &cork);
}
/*
@@ -1461,6 +1463,7 @@ void ip_send_reply(struct sock *sk, struct sk_buff *skb, struct ip_reply_arg *ar
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);
@@ -1478,20 +1481,16 @@ void ip_send_reply(struct sock *sk, struct sk_buff *skb, struct ip_reply_arg *ar
daddr = replyopts.opt.opt.faddr;
}
{
struct flowi4 fl4;
flowi4_init_output(&fl4, arg->bound_dev_if, 0,
RT_TOS(ip_hdr(skb)->tos),
RT_SCOPE_UNIVERSE, sk->sk_protocol,
ip_reply_arg_flowi_flags(arg),
daddr, rt->rt_spec_dst,
tcp_hdr(skb)->source, tcp_hdr(skb)->dest);
security_skb_classify_flow(skb, flowi4_to_flowi(&fl4));
rt = ip_route_output_key(sock_net(sk), &fl4);
if (IS_ERR(rt))
return;
}
flowi4_init_output(&fl4, arg->bound_dev_if, 0,
RT_TOS(ip_hdr(skb)->tos),
RT_SCOPE_UNIVERSE, sk->sk_protocol,
ip_reply_arg_flowi_flags(arg),
daddr, rt->rt_spec_dst,
tcp_hdr(skb)->source, tcp_hdr(skb)->dest);
security_skb_classify_flow(skb, flowi4_to_flowi(&fl4));
rt = ip_route_output_key(sock_net(sk), &fl4);
if (IS_ERR(rt))
return;
/* And let IP do all the hard work.
@@ -1512,7 +1511,7 @@ void ip_send_reply(struct sock *sk, struct sk_buff *skb, struct ip_reply_arg *ar
arg->csumoffset) = csum_fold(csum_add(skb->csum,
arg->csum));
skb->ip_summed = CHECKSUM_NONE;
ip_push_pending_frames(sk);
ip_push_pending_frames(sk, &fl4);
}
bh_unlock_sock(sk);