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ipv6: make lookups simpler and faster

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TCP listener refactoring, part 4 :

To speed up inet lookups, we moved IPv4 addresses from inet to struct
sock_common

Now is time to do the same for IPv6, because it permits us to have fast
lookups for all kind of sockets, including upcoming SYN_RECV.

Getting IPv6 addresses in TCP lookups currently requires two extra cache
lines, plus a dereference (and memory stall).

inet6_sk(sk) does the dereference of inet_sk(__sk)->pinet6

This patch is way bigger than its IPv4 counter part, because for IPv4,
we could add aliases (inet_daddr, inet_rcv_saddr), while on IPv6,
it's not doable easily.

inet6_sk(sk)->daddr becomes sk->sk_v6_daddr
inet6_sk(sk)->rcv_saddr becomes sk->sk_v6_rcv_saddr

And timewait socket also have tw->tw_v6_daddr & tw->tw_v6_rcv_saddr
at the same offset.

We get rid of INET6_TW_MATCH() as INET6_MATCH() is now the generic
macro.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2013-10-03 15:42:29 -07:00 • committed by David S. Miller
parent 05dbc7b594
commit efe4208f47
35 changed files with 213 additions and 288 deletions
Download patch file Download diff file Expand all files Collapse all files

17
net/ipv6/raw.c
View file

@ -77,20 +77,19 @@ static struct sock *__raw_v6_lookup(struct net *net, struct sock *sk,
sk_for_each_from(sk)
if (inet_sk(sk)->inet_num == num) {
struct ipv6_pinfo *np = inet6_sk(sk);
if (!net_eq(sock_net(sk), net))
continue;
if (!ipv6_addr_any(&np->daddr) &&
!ipv6_addr_equal(&np->daddr, rmt_addr))
if (!ipv6_addr_any(&sk->sk_v6_daddr) &&
!ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr))
continue;
if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif)
continue;
if (!ipv6_addr_any(&np->rcv_saddr)) {
if (ipv6_addr_equal(&np->rcv_saddr, loc_addr))
if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) {
if (ipv6_addr_equal(&sk->sk_v6_rcv_saddr, loc_addr))
goto found;
if (is_multicast &&
inet6_mc_check(sk, loc_addr, rmt_addr))
@ -302,7 +301,7 @@ static int rawv6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
}
inet->inet_rcv_saddr = inet->inet_saddr = v4addr;
np->rcv_saddr = addr->sin6_addr;
sk->sk_v6_rcv_saddr = addr->sin6_addr;
if (!(addr_type & IPV6_ADDR_MULTICAST))
np->saddr = addr->sin6_addr;
err = 0;
@ -804,8 +803,8 @@ static int rawv6_sendmsg(struct kiocb *iocb, struct sock *sk,
* sk->sk_dst_cache.
*/
if (sk->sk_state == TCP_ESTABLISHED &&
ipv6_addr_equal(daddr, &np->daddr))
daddr = &np->daddr;
ipv6_addr_equal(daddr, &sk->sk_v6_daddr))
daddr = &sk->sk_v6_daddr;
if (addr_len >= sizeof(struct sockaddr_in6) &&
sin6->sin6_scope_id &&
@ -816,7 +815,7 @@ static int rawv6_sendmsg(struct kiocb *iocb, struct sock *sk,
return -EDESTADDRREQ;
proto = inet->inet_num;
daddr = &np->daddr;
daddr = &sk->sk_v6_daddr;
fl6.flowlabel = np->flow_label;
}